OLD WILMINGTON ROAD

GROUNDWATER CONTAMINATION
SUPERFUND SITE

OPERABLE UNIT 1
WEST CALN TOWNSHIP,
CHESTER COUNTY, PENNSYLVANIA

$ A %

J

\ PROlt0

INTERIM RECORD OF DECISION

United States Environmental Protection Agency
Region 3
1600 John F. Kennedy Boulevard
Philadelphia, PA 19103-2852

April 2023


-------
OLD WILMINGTON ROAD GROUNDWATER CONTAMINATION

SUPERFUND SITE OPERABLE UNIT 1
WEST CALN TOWNSHIP, CHESTER COUNTY, PENNSYLVANIA

INTERIM RECORD OF DECISION

Table of Contents

DECLARATION	1

DECISION SUMMARY	4

I.	SITE NAME, LOCATION, AND DESCRIPTION	4

II.	SITE HISTORY AND ENFORCEMENT ACTIVITIES	5

III.	HIGHLIGHTS OF COMMUNITY PARTICIPATION	7

IV.	SCOPE OF THE SELECTED REMEDY	7

V.	SITE CHARACTERISTICS	8

A.	Hydrology	8

B.	Geology	8

C.	Groundwater	9

D.	Water Supply	10

VI.	CURRENT AND POTENTIAL FUTURE LAND AND RESOURCE USES	10

VII.	SUMMARY OF SITE RISKS	10

A.	Human Health Risk Assessment Summary	10

B.	Summary of Ecological Risk Assessment	16

VIII.	REMEDIAL ACTION OBJECTIVES	16

IX	SUMMARY OF REMEDIAL ACTION ALTERNATIVES	17

X	COMPARATIVE ANALYSIS OF ALTERNATIVES	22

A.	Criteria Used to Compare Cleanup Alternatives	22

B.	Detailed Analysis of Proposed Remedial Alternatives	23

XI. SELECTED REMEDY	27

A. Summary of the Rationale for the Selected Remedy	28


-------
B.	Summary of the Estimated Costs	28

C.	Performance Standards	28

D.	Expected Outcome of the Selected Remedy	29

XII.	STATUTORY DETERMINATIONS	29

A.	Compliance with Applicable or Relevant and Appropriate Requirements	29

B.	Cost Effectiveness	30

C.	Utilization of Permanent Solutions and Alternative Treatment Technologies to the
Maximum Extent Practicable and Preference for Treatment as a Principal Element
	30

D.	Five Year Review Requirements	30

E.	Documentation of Significant Changes	30

XIII.	RESPONSIVENESS SUMMARY	31

APPENDICES
APPENDIX A - ADMINISTRATIVE RECORD INDEX
APPENDIX B - RESPONSIVENESS SUMMARY
APPENDIX C - ARARs AND TBCs FOR SELECTED REMEDY
APPENDIX D - PERFORMANCE STANDARDS FOR RESIDENTIAL WELL WATER
APPENDIX E - CLEANUP LEVELS FOR VAPOR INTRUSION
APPENDIX F - RAGS PART D TABLES
APPENDIX G - PADEP CONCURRENCE LETTER


-------
INTERIM RECORD OF DECISION

OLD WILMINGTON ROAD GROUNDWATER
CONTAMINATION SUPERFUND SITE
OPERABLE UNIT 1

DECLARATION

The Site is located in West Cain Township, Chester County. The Site was placed on the National Priorities

List (NPL) on February 4, 2000. The National Superfund Database Identification Number is

PAD981938939. The Site consists of four investigation areas and three inter-connected plumes of

contaminated groundwater.

The Site investigations areas are as follows:

•	Investigation Area 1 (Area 1) includes a junkyard located on Old Wilmington Road, across the street
from Investigation Area 4.

•	Investigation Area 2 (Area 2) is located at the end of Donovan Drive and includes an inactive former
landfill.

•	Investigation Area 3 (Area 3) is located right next to Area 1, on Old Wilmington Road, and includes
two stone-filled trenches present on the northwestern edge of the property where liquid wastes were
allegedly disposed.

•	Investigation Area 4 (Area 4) is located on the east side of Old Wilmington Road, across the street
from Area 1. This investigation area includes a truck yard which was identified as a possible source
of groundwater contamination.

The three inter-connected plumes of contaminated groundwater consist of the following contaminants of

concern (COCs):

•	A plume predominantly consisting of tetrachloroethene (PCE);

•	A plume predominantly consisting of trichloroethene (TCE); and

•	A plume predominantly consisting of 1,4-Dioxane.

Various inorganic COCs are also present at the Site.

Statement oLBasJ^-am< Pnrnos?

For management of the remedial action, EPA has organized the Site cleanup into two Operable Units (OlJs):

•	Operable Unit One (OU-1) is defined by the contaminated groundwater used as drinking water and
volatile organic compound (VOC)-contaminated vapors attributable to the Site-related groundwater
plumes with the potential to migrate from subsurface into residential indoor air

1


-------
• Operable Unit Two (OU-2) is defined by the remaining Site-related contamination in soils and

groundwater.

This decision document presents an Interim ROD for an interim remedial action (Selected Remedy) that
addresses OU-1. The Selected Remedy was chosen in accordance with the requirements of the
Comprehensive Environmental Response, Compensation, and Liability Act of 1980 (CERCLA), as
amended, and, to the extent practicable, the National Oil and Hazardous Substances Pollution
Contingency Plan (NCP), 40 C.F.R. Part 300. This decision document explains the factual and legal
basis for the Selected Remedy for OU-1 at the Site. This ROD is based on the Administrative Record
(AR) for the Site, which was developed in accordance with Section 113 (k) of CERCLA, 42 U.S.C. §
9613(k). This AR file is available for review online at https://semspub.epa.gov/src/collection/03/AR67242,
at the EPA Region 3 Records Center in Philadelphia, Pennsylvania, and at Coatesville Area Public Library
in Coatesville, Pennsylvania. The AR file Index (Appendix A) identifies each document contained in the
AR file upon which the selection of the remedy is based. The signed ROD will become part of the AR for
the Site.

The Pennsylvania Department of Environmental Protection (PADEP) concurs with the Selected Remedy

for OU-1.

Assessment of the Site

The Selected Remedy in this Interim ROD is necessary to protect the public health or welfare or the
environment from actual or threatened releases of hazardous substances into the environment.

Description of the Selected Remedy

The Selected Remedy for OU-1 addresses exposure to Site-related groundwater contamination in residential
drinking water wells as well as vapor intrusion (VI) at affected or potentially affected properties. EPA has
delineated the extent of the PCE, TCE and 1,4-Dioxane plumes and identified an "area of concern" (AOC)
which includes properties impacted or potentially impacted by Site-related COCs. The AOC comprises the
area overlying the groundwater plumes and investigation areas as well as a buffer area around the plumes.
The extent of the buffer area will be determined during the remedial design. A future decision document will
address remaining contamination, including inorganics, present in soils and groundwater at the Site for both
OU-1 and OlJ-2.

The Selected Remedy for OU-1 consists of a public water line, VI mitigation systems, institutional controls
(ICs), and long-term monitoring (LTM). The estimated present value of total costs over a 30-year period for
this remedial action is $7,786,000.

Statutory Determinations

The Selected Remedy is protective of human health and the environment, complies with Federal and
State requirements that are legally applicable or relevant and appropriate to the remedial action, is
cost-effective, and utilizes permanent solutions to the maximum extent practicable.

Because this Selected Remedy will result in hazardous substances remaining on-Site above levels that
allow for unlimited use and unrestricted exposure, a review will be conducted within five years after
commencement of the Selected Remedy to ensure that the remedy continues to provide adequate
protection of human health and the environment. Such reviews will be conducted a minimum of every

2


-------
five years thereafter, until EPA determines that hazardous substances remaining at the Site do not
prevent unlimited use and unrestricted exposure at the Site.

Authorizing Signature

This Interim ROD documents the Selected Remedy for OU-1 of the Site. EP A selected this interim remedial
action with the concurrence of the P ADEP.

Digitally signed by PAUL

PAUL LEONARD LEONARD

Date: 2023.04.14 11:47:21 -04 00'

Paul Leonard. Director	Date

Superfund and Emergency Management Division
EPA Region 3

3


-------
INTERIM RECORD OF DECISION
OLD WILMINGTON ROAD GROUNDWATER CONTAMINATION
SUPERFUND SITE OPERABLE UNIT 1

DECISION SUMMARY

I SITE NAME, LOCATION, AND DESCRIPTION

The Site is located in West Cain Township, Chester County. The Site was placed on the National Priorities
List (NPL) on February 4, 2000. The Site consists of four investigation areas and three inter-connected
plumes of contaminated groundwater.

The Site investigations areas are as follows:

•	Investigation Area 1 includes a junkyard located on Old Wilmington Road, across the street from
Investigation Area 4.

•	Investigation Area 2 is located at the end of Donovan Drive and includes an inactive former landfill.

•	Investigation Area 3 is located right next to Area 1, on Old Wilmington Road, and includes two
stone-filled trenches present on the northwestern edge of the property where liquid wastes were
allegedly disposed.

•	Investigation Area 4 is located on the east side of Old Wilmington Road, across the street from Area
1. This investigation area includes a truck yard which was identified as a possible source of
groundwater contamination.

Figure 1: Site Map


-------
The three inter-connected plumes of contaminated groundwater consist of the following contaminants of
concern (COCs):

•	A plume predominantly consisting of tetrachloroethene (PCE);

•	A plume predominantly consisting of trichloroethene (TCE); and

•	A plume predominantly consisting of 1,4-Dioxane.

Various inorganic COCs are also present at the Site.

Figure 2: Plume Extent

i •. v -

, End of proposed
¦ Water Main

United States
Environmental Protection
Agency	

Legend

GROUNDWATER PLUME MAP
PCE, TCE AND 1.4-DIOXANE
OLD WILMINGTON ROAD SITE
SADSBURYVILLE. PENNSYLVANIA

' Proposed Water Main
Tetrachloroethene (PCE) Piume
[Trichloroethene (TCE) Plume
i 1.4-Dioxane Plume

The National Superfund Database Identification Number for the Site is PAD981938939. EPA Region 3 is
the lead agency for the Site, and PADEP is the support agency.

It. SITE HISTORY AND ENFORCEMENT ACTIVITIES

The Site has been the subject of numerous past investigations as a result of multiple complaints of waste
disposal that were investigated by the Chester County Health Department (CCHD) and the Commonwealth
of Pennsylvania during the 1970s and 1980s. Records indicate that a waste disposal permit was never
applied for, while eyewitness accounts additionally reported that tanker trucks were observed discharging
their contents onto the ground adjacent to the landfill, among other areas. Aerial photographs show mounded
material on the landfill sometime between 1975 and 1980. Area 2 subsequently became the subject of a
Pennsylvania Department of Environmental Resources (PADER), now known as PADEP, preliminary

5


-------
assessment in December 1986. In 1988, 1 1 residential wells were sampled by EPA as part of a Site
Investigation (referred to hereafter as 1988 Phillips Landfill SI).

Residential well sampling data collected during the 1988 Phillips Landfill SI indicated that the residential
well located on the junkyard site (Area 1) and several other nearby wells, including the well system that
provides drinking water to the residents of the mobile home park, were contaminated with TCE and PCE,
both of which are volatile organic compounds (VOCs), at concentrations exceeding their respective
maximum contaminant levels (MCLs).

Subsequent sampling conducted by PADEP confirmed the presence of VOC contamination in the public
water supply system for the mobile home park which was subsequently determined to be impacted by Area
1. In November 1992, sampling and inspection of the public water supply system for the mobile home park
was conducted. Laboratory results indicated that the mobile home park supply well and a nearby residential
well contained VOCs above applicable MCLs, and the concentration of PCE in the residential well exceeded
the EPA removal action level.

EPA initiated a removal site assessment on February 26, 1993. Based on the results of this assessment, EPA
determined that there was an immediate and significant threat to human health due to elevated
concentrations of hazardous substances, including PCE and TCE, in the drinking water supplies of nearby
residents. On December 21, 1993, EPA commenced a removal action, which focused on providing bottled
water, and later carbon filtration units, to residences affected by groundwater contamination above MCLs.

In 1993, EPA also issued an emergency order to the owner/operator of the mobile home park under the Safe
Drinking Water Act, requiring, among other things, that the owner/operator provide free bottled water to the
mobile home park residents until a drinking water treatment system and other necessary improvements to
the park's water system were installed. In 1996 Perry and Jeanne Phillips, doing business as Phillips Mobile
Home Park, entered into a Partial Consent Decree (1996 Decree) with the U.S. and PADEP, requiring
construction of various water treatment system improvements for the park's residential water supply as well
as delineated sampling and reporting requirements.

As part of the ongoing removal action, EPA also began investigating the source of the groundwater
contamination. Laboratory analytical results from soil gas, soil, and groundwater sampling indicated that an
additional and separate source of VOC contamination existed in Area 3. Those results confirmed eyewitness
reports of separate waste dumping in Area 3 and prompted EPA to identify the area as a potential hazardous
waste site on March 1 1, 1994. Based on these results, EPA investigated Area 3 separately, which confirmed
that two distinct types of groundwater contaminants were present in separate plumes.

On May 4, 1994, EPA approved a request for additional funding to mitigate potential risks posed to
residents via ingestion of groundwater contamination and inhalation of vapors emanating from the areas
adjacent to Investigation Area 1. The May 1994 approval provided for continued response actions initiated
during the ongoing removal activities at the Site, including providing whole-house water treatment units to
residents with VOC contamination above removal action levels; determining the area of origin of the VOC
contamination in order to mitigate the source and characterize the plumes; and providing for continued
monitoring and maintenance of whole-house water treatment units to ensure safe drinking water.

Subsequent to the Site being added to the NPL in 2000, Remedial Investigation (RI) activities were initiated
and consisted of: (1) Hydrogeologic Investigation, (2) Source Area Assessment, (3) Surface Water/Sediment
Assessment, and (4) Ecological Characterization. An RI report (2010 RI) was prepared in 2010. Review of

6


-------
the 2010 RI report indicated significant data gaps, primarily caused by analysis of only a limited well network
due to limited Site access. As a result, in order to further study groundwater contamination at the Site, EPA
initiated the Supplemental RI, which was completed in 2022. This supplemental investigation included
performing a baseline round of sampling of all historic wells and stream sampling locations, installation of
new wells at the Site, additional rounds of groundwater sampling, a Site-wide residential sampling event, and
a VI sampling event at homes overlying the plumes. The study found, among other things, that the
groundwater is also contaminated with 1,4-Dioxane, a semivolatile organic compound (SVOC); elevated
concentrations of metals were primarily contained in samples from wells not affected by VOC contamination;
VOC contamination is present at all four investigation areas; and sub-slab soil gas detections of Site-related
substances at several residences indicated possible contaminant migration from groundwater. In summary, the
Supplemental RI concluded that groundwater contamination at the Site presents unacceptable risks to drinking
water supplies and subsurface vapors that may affect residential indoor air.

In 2022, EPA developed a Focused Feasibility Study (FFS) for the Site. The remedial alternatives presented
in the FFS were evaluated by EPA and a Preferred Alternative was proposed in the Proposed Remedial Action
Plan (Proposed Plan) in September 2022. During the public comment period for the Proposed Plan, EPA
obtained new monitoring well and residential well data on per- and polyfluoroalkyl substances (PFAS) at the
Site. EPA continues to investigate PFAS at the Site and will consider this information in future decision
documents.

III. HIGHLIGHTS OF COMMUNITY PARTIC IPATION

Pursuant to Section 113(k)(2)(B) of CERCLA, 42 U.S.C. § 113(k)(2)(B), the Supplemental RI and FFS
reports, the Proposed Plan, and other documents relating to the OU-1 were released to the public for
comment on September 28, 2022. These documents were made available to the public online at
https://semspub.epa.gov/src/collection/03/AR67242, in the EPA Administrative Records Room at EPA's
Region 3 office, and in the Coatesville Area Public Library in Coatesville, Pennsylvania. The notice of
availability of these documents was published in the Daily Local News and a fact sheet detailing the Proposed
Plan was mailed to local citizens on September 28,2022.

A public comment period was held from September 28, 2022 until October 28, 2022. During the public
comment period, EPA received both written and oral comments and has responded to the comments in the
Responsiveness Summary section, which is included as part of this Interim ROD.

EPA held a public meeting at the Wagontown Fire Company, located at 412 W. Kings Highway,
Coatesville, PA 19320, on October 1 1, 2022. During the public meeting, EPA gave a formal presentation
on EPA's Proposed Plan, followed by a "Question and Answer" session where representatives from
EPA answered questions regarding the Site and the Proposed Plan. Responses to all significant
comments recei ved during the public comment period, including those raised at the public meeting, are
provided in the Responsiveness Summary (Appendix B).

IV. SCOPE OF THE SELECTED REMEDY

Several privately owned residential wells are known to be contaminated with Site-related contamination. To
eliminate the risk to residents whose wells are impacted by the Site, current residential water supply systems

7


-------
contaminated with Site-related contaminants have been equipped with carbon treatment systems. While
these wells are provided with treatment, other wells in the area, especially those that currently lie in or
adjacent to the groundwater contamination plumes, have the potential to be impacted by Site-related
contaminants in the future. This Interim ROD for OU-1 provides a permanent remedy (Selected Remedy) to
prevent the exposure of affected or potentially affected properties to Site-related groundwater contamination
in residential drinking water wells, which also causes VI concern. EP A has delineated the extent of the
PCE, TCE, and 1,4-dioxane plumes, which have stabilized, and identified an "area of concern" (AOC)
which includes properties impacted or potentially impacted by Site-related COCs. The AOC comprises the
area overlying the plumes and investigation areas as well as a buffer area around the plumes (see Figure 3).
The extent of the buffer area will be determined during the remedial design. Additionally, the Selected
Remedy is more protective of human health because installation of a water line would permanently
eliminate exposure to contaminated groundwater as a drinking water source and protect against potential
emerging contaminants, such as PFAS. Future decision documents will address potential emerging
contaminants and remaining contamination present in soils and groundwater at the Site, for both OU-1 and
OU-2.

V. SITE C HARAC TERISTIC S

The topography of the area slopes gently from the northwest to southeast across the Site. Large portions of
the Site are relatively flat-lying, likely from grading associated with construction and agriculture. There are
a number of steep slopes on the Site which are located immediately adjacent to streams, tributaries, property
lines, and ditches.

A.	Hydrology

The major surface water bodies at the Site are Rock Run, the unnamed surface water body located in the
vicinity of Ash Road, and two unnamed tributaries (one to Rock Run and one to Buck Run). Rock Run
flows along the northern and eastern boundaries of the Site from the northwest to the southeast, past a small
pond located along the southeastern side of Ash Road. Runoff from Investigation Areas 1, 3, and 4 flows
southeast toward Rock Run and its unnamed tributary to the south. Overland runoff is collected in a network
of small creeks and swales, and numerous drainage ditches along roadways. Runoff from Area 2 drains to an
unnamed wetland south of Karen Circle.

B.	Geology

The Site lies in the Piedmont Physiographic Province, an area underlain by highly deformed metamorphosed
sedimentary rocks, which have been intruded by younger igneous rock bodies. The Mine Ridge formation is
the predominant surface geologic formation in the area, which is found to the south and east of the Site
where it contacts the major rock types found at the Site - Chickies Quartzite and the Baltimore Gneiss.

Other secondary rock formations in the area include serpentinite and pegmatite.

The Chickies Quartzite is a Late Pre-Cambrian to Cambrian-aged granular quartzite with interbedded
quartzose schist. The Chickies encompasses much of the Site and surrounding area. The permeability of the
Chickies Quartzite is generally much lower than that of the Mine Ridge or Baltimore Gneiss. Most water
from this formation is obtained from the fractured weathered zone at the top of bedrock. The formation is
difficult to drill, except in areas where it is heavily weathered. The Baltimore Gneiss (often referred to as
"undifferentiated gneiss") is a Cambrian-aged foliated metamorphic rock in which bands of granular

8


-------
minerals alternate with bands of elongate or prismatic minerals, making the rock appear layered. In some
areas, igneous intrusions (pegmatite, gabbro) cause the rock to vary from banded gneiss to a massively
textured igneous rock. The permeability of the Baltimore Gneiss is generally much higher than that of the
Chickies Quartzite.

C. Groundwater

Rock type can significantly affect contaminant transport and groundwater flow velocity, patterns, and fate
and transport. The Mine Ridge Gneiss and the Chickies Quartzite formation are separated by a thrust fault
which bisects the Site. This fault represents the contact between rocks of the Chickies Quartzite and the
Mine Ridge Gneiss. In this thrust fault, older rocks of the Mine Ridge Gneiss were pushed over younger
rocks of the Chickies Quartzite. This thrust fault is significant to Site characterization because it is believed
to be a major controlling influence on contaminant migration and groundwater flow.

Along with the thrust fault identified on the Site, a network of smaller fractures (joints) was identified.

When these fractures become saturated with groundwater, they form a pattern of permeability that results in
preferential contaminant transport and groundwater flow. These joint-related fractures represent a distortion
of normal groundwater flow and can produce preferred contaminant transport and groundwater flow
pathways along a network of fractures.

Groundwater flow at the Site occurs vertically. The shallowest two groundwater zones encountered, which
would represent the overburden aquifer and the first bedrock aquifer, are strongly connected, likely with
only minimal confinement between the two, providing a pathway for downward contaminant migration.

Groundwater flow direction at the Site is generally eastward, with isolated depressions likely caused by
localized pumping of private drinking water wells. Measurements of water levels, observations of geology,
and analytical results indicate, however, that groundwater flows primarily through secondary porosity such
as fractures and faults, rather than through the primary porosity of the formations. Groundwater discharges
to the surface bodies at the Site and provides base flow to the stream system of Rock Run, Buck Run, and
their tributaries.

Finally, groundwater modeling indicates that, in general, groundwater flow originates northwest of the Site
at the topographic high near Debbie Drive, with groundwater from Investigation Areas 1, 3, and 4 flowing
east-northeast toward the houses along Ash Road. Modeling of groundwater flow paths from Area 2 (the
landfill) indicates that groundwater and contaminants would flow generally southward.

Available data show that groundwater at the Site has been impacted by more than one source area.
Investigation Areas 1, 3, and 4, and, to a much lesser extent. Investigation Area 2. Site groundwater contains
VOCs, 1,4-Dioxane, and some metals (see Appendix D for list of COCs). Migration of COCs and their
breakdown products in groundwater has been documented both horizontally and vertically in the aquifer
systems.

VOCs, specifically PCE and TCE, that are dissolved in the groundwater can volatilize into the vapor phase.
PCE and TCE can readily volatilize at the water table because of their relatively high partial pressure. These
vapors can then migrate towards the ground surface. While the direction of vapor movement can be difficult
to predict, soil vapor investigations conducted at the Site have shown that PCE and TCE may accumulate
underneath the basement slabs of residential structures in the AOC. The PCE and TCE vapors can then

9


-------
migrate through preferential pathways that include cracks in the basement slab or walls and enter the
residential structure. This occurrence is referred to as vapor intrusion.

D. Water Supply

Most of the residences within the Site use groundwater from private drinking water wells for domestic
purposes. At least 60 drinking water wells supply water to residences and businesses within the Site. Water
wells, including residential, and monitoring wells, are regulated by Chester County under a permitting
process.

Homes in the mobile home park adjacent to the Investigation Area 2 landfill are supplied with water from a
common production well on the property at Investigation Area 1. Water from this common well is
contaminated and receives treatment prior to distribution pursuant to the previously discussed 1996 Decree.

Public water is available in an area northeast of the Site. An 8-inch-diameter water line, owned and operated
by Pennsylvania American Water Company, runs along Airport Road. Public water supplies are regulated
and permitted by Pennsylvania's Safe Drinking Water Program.

VI. CURRENT AND POTENTIAL FUTURE LAND AND RESOURCE USES

The ma jority of the land use is agricultural and wooded, however, residential space and commercial
facilities also exist in the vicinity of the Site. The highest concentrations of residences are located west of
Old Wilmington Road and along Ash Road. Wooded tracts of land, including stream buffers and
undeveloped properties, are found throughout the Site, with the largest wooded area located west of the
landfill. The agricultural properties at the Site lie to the south and west of Ash Road.

The aquifer is the current source of drinking water for the community. The four investigation areas are
currently privately owned and either inactive or used for various commercial uses. The land use controls
associated with the Selected Remedy (see selected ICs) will be consistent with current and any future land
use of the Site properties.

VII. SUMMARY OF SITE RISKS

A. Human Health Risk Assessment Summary

Human health risk assessments (HHRA) were completed in 2010, as part of the 2010 RI, in 2019, and in
2022 as part of the Supplemental RI to re-evaluate the potential threat to human health associated with the
release or potential release of COCs from the Site. Results of the 2022 HHRA were used to identify affected
media, COCs, and potential exposure pathways that may result in unacceptable human health risks.
Appendix F includes a summary of the receptors with risk estimates exceeding risk management
benchmarks under the reasonable maximum exposure (RME) scenario. The results of the updated risk
evaluations are summarized in Table 1 and provided in the Risk Assessment Guidance for Superfund
(RAGS) Part D Table 10s (Appendix F), which present the updated calculations of chemical cancer risks
and non-cancer hazards.

Identification of Chemicals of Concern

10


-------
In general, a chemical is selected as a contaminant of potential concern (COPC) and retained for further
quantitative risk evaluation if the maximum detection in a sampled medium exceeds the lowest risk-based
concentration (RBC). Chemicals eliminated from further evaluation are assumed to present minimal risks to
potential human receptors. The analytical data for soil, groundwater, surface water, and sediment were
screened against EPA Regional Screening Levels (RSLs) to determine which substances were required for
quantitative risk calculation. Sub-slab soil gas substances were screened against EPA Vapor Intrusion
Screening Levels (VISLs). CO PCs were selected for surface soil, subsurface soil, groundwater, surface
water, and sediment using the risk-based CO PC screening levels.

Exposure point concentrations (EPCs) were calculated for surface soil, combined surface/subsurface soil,
groundwater, and sediment. No CO PCs were identified for surface water, therefore EPCs were not
calculated for surface water. The evaluation of vapor intrusion risks for specific homes was based on indoor
air and sub-slab sample concentrations.

Exposure Assessment

A conceptual site model (CSM) facilitates consistent and comprehensive evaluation of potential risks to
human health by creating a framework for identifying the pathways by which human receptors may contact
environmental media contaminated by site activities.

The exposure assessment portion of the risk assessment defines and evaluates the type and magnitude of
human exposure to the chemicals present at or migrating from a site. Based on current and potential future
land use at the site, construction workers, industrial workers, and residents were identified as potential
receptors. Groundwater within the study area is used as a drinking water source and several surveys have
been conducted to identify residential wells within the study area that may be impacted by the groundwater
contaminant plume.

Construction workers could be exposed to soil via ingestion, dermal contact, and inhalation and to shallow
groundwater via ingestion, dermal contact, and inhalation. Industrial workers could be exposed to soil via
ingestion, dermal contact, and inhalation, to groundwater if used as a potable source via ingestion, dermal
contact, and inhalation, and to VOCs migrating from a subsurface source. Residential receptors could be
exposed to soil via ingestion, dermal contact, and inhalation, to groundwater if used as a potable source via
ingestion, dermal contact, and inhalation, and to VOCs migrating from a subsurface source.

To provide a full characterization of potential exposure, both RME and central tendency exposures (CTE)
were evaluated in the HHRA.

Exposure to lead was assessed using the following models:

•	The latest version of EPA's Integrated Exposure Uptake Biokinetic (IEUBK) Model for lead (version
1.1 Build 11). This model is typically used to evaluate lead exposure assuming a residential land use
scenario.

•	EPA's Adult Lead Methodology (2003b and 2017). This methodology is typically used to evaluate
lead exposure assuming a non-residential land use scenario.

The IEUBK Model for lead is designed to estimate blood levels of lead in children (under 7 years of age)
based on either default or site-specific input values for air, drinking water, diet, dust, and soil exposure.
Studies indicate that infants and young children are extremely susceptible to adverse effects from exposure

11


-------
to lead. Considerable behavioral and developmental impairments have been noted in children with elevated
blood-lead levels. Historically blood-lead levels greater than 10 micrograms per deciliter (|.ig/dL) were
considered to be a "concern." Current scientific literature on lead toxicity indicates that adverse health
effects are associated with blood-lead (PbB) levels below the long-held target of 10 (.ig/dL. Specifically,
evidence exists of clear cognitive declines in young children with PbB levels between 2 and 8 |.ig/dL (as
referenced in the December 2016 EPA Office of Land and Emergency Management [OLEM] Memo).
Therefore, a value of 5 ug/dL was used as the acceptable blood lead level in this HHRA.

The exposure factors used to estimate intake for the construction worker, industrial worker, and resident are
presented and defined in RAGS Part D Tables in Appendix F.

Toxicity Assessment

The toxicity assessment weighs the evidence regarding the potential for exposure to chemicals to produce
adverse effects in exposed receptors and, when possible, the assessment estimates the relationship between
the exposure to a chemical and the increased likelihood and/or severity of adverse effects. Quantitative
estimates of the relationship between the magnitude and type of exposures and the severity or probability of
human health effects are defined for the identified COPCs. Quantitative toxicity values determined during
this component of the risk assessment are integrated with exposure assessment outputs to characterize the
potential occurrence of adverse health effects for each receptor group.

The reference dose (RfD) is the toxicity value used to evaluate noncarcinogenic health effects for ingestion
and dermal exposures. The reference concentration (RfC) is used to evaluate noncarcinogenic health effects
for inhalation exposures. The RfD and RfC estimate a daily exposure level for a human population that is
unlikely to pose an appreciable risk during a portion or for all of a human lifetime. It is based on a review of
animal and/or human toxicity data with adjustments for various data uncertainties. Carcinogenic effects are
quantified using the cancer slope factor (CSF) for ingestion and dermal exposures and using inhalation unit
risks (IUR) for inhalation exposure that are plausible upper bound estimates of the probability of the
development of cancer per unit intake of the chemical over a lifetime.

Oral RfDs and CSFs and inhalation RfCs and IlJRs used in this HHRA were obtained from the following
primary EPA recommended literature sources using following hierarchy (EPA, 2003c):

•	Tier 1 - Integrated Risk Information System (IRIS).

•	Tier 2 - EPA Provisional Peer Reviewed Toxicity Values (PPRTVs) - The Office of Research and
Development/National Center for Environmental Assessment (NCEA) Superfund Health Risk
Technical Support Center develops PPRTVs on a chemical-specific basis when requested by EPA's
Superfund program.

•	Tier 3 - Other Toxicity Values - These sources include but are not limited to California
Environmental Protection Agency (Cal EPA) toxicity values. Agency for Toxic Substances and
Disease Registry ( ATSDR) values, and the Health Effects Assessment Summary Tables (HEAST).

Toxicological data for the COPCs, including non-carcinogens and carcinogens, are presented in RAGS Part
D Table 5.1 and Table 5.2 for non-carcinogenic effects and in RAGS Part D Table 6.1 and Table 6.2 for
carcinogenic effects (Appendix F).

Risk Characterization

12


-------
Quantitative estimates of noncarcinogenic and carcinogenic risks (His and incremental lifetime cancer risk
(ILCRs), respectively) were developed for potential human receptors contacting site environmental media
(Appendix F). For carcinogens, risks are generally expressed as the incremental probability of an
individual's developing cancer over a lifetime as a result of exposure to the carcinogen. Excess lifetime
cancer risk is calculated from the following equation:

Risk = GDI x SF

where:	risk = a unitless probability (e.g., 2 x 10-5) of an individual's developing cancer

GDI = chronic daily intake averaged over 70 years (mg/kg-day)

SF = slope factor, expressed as (mg/kg-day)-1.

These risks are probabilities that usually are expressed in scientific notation (e.g., lxl0"6). An excess
lifetime cancer risk of lxlO"6 indicates that an individual experiencing the reasonable maximum exposure
estimate has a 1 in 1,000,000 chance of developing cancer as a result of site-related exposure. This is
referred to as an "excess lifetime cancer risk" because it would be in addition to the risks of cancer
individuals face from other causes such as smoking or exposure to too much sun. The chance of an
individual's developing cancer from all other causes has been estimated to be as high as one in three. EPA's
generally acceptable risk range for site-related exposures is 10"4 to 10"6.

The potential for noncarcinogenic effects is evaluated by comparing an exposure level over a specified time
period (e.g., life-time) with a RfD derived for a similar exposure period. An RfD represents a level that an
individual may be exposed to that is not expected to cause any deleterious effect. The ratio of exposure to
toxicity is called a hazard quotient (HQ). An HQ<1 indicates that a receptor's dose of a single contaminant
is less than the RfD, and that toxic noncarcinogenic effects from that chemical are unlikely. The Hazard
Index (HI) is generated by adding the HQs for all chemical(s) of concern that affect the same target organ
(e.g., liver) or that act through the same mechanism of action within a medium or across all media to which
a given individual may reasonably be exposed. An HI< 1 indicates that, based on the sum of all HQ's from
different contaminants and exposure routes, toxic noncarcinogenic effects from all contaminants are An HI
> 1 indicates that site-related exposures may present a risk to human health.

The HQ is calculated as follows:

Non-cancer HQ = CDI/RfD

where:	GDI = Chronic daily intake

RfD = reference dose.

GDI and RfD are expressed in the same units and represent the same exposure period (i.e., chronic,
subchronic, or short-term).

Table 1 presents a summary of the receptors with risk estimates exceeding risk management benchmarks
under the RME scenario. Under the RME scenario for current and future land use, cumulative ILCRs for
future lifelong residents exceed the acceptable cancer risk of lxlO"4. Benzo(a)pyrene, dieldrin, naphthalene,
and arsenic in surface/subsurface soil; and chloroform, PCE, TCE, vinyl chloride, 1,4-dioxane, BEHP, and
arsenic in groundwater were the contributors to the ILCR for the future lifelong residents.

13


-------
Table 1: Summary of Health Risks for Reasonable Maximum Exposures

Ki-i r|)liii->

i m

IT

H 	



i



Current Industrial
Workers

Surface Soil

3E-06

None

0.2

I

¦Tone

Current Child
Residents

Surface Soil

(see lifetime)

-

3(3)

None

Sediment

(see lifetime)

-

0.3

None

Total

(see lifetime)

-

3(3)

-

Current Adult
Residents

Surface Soil

(see lifetime)

-

0.3

None

Sediment

(see lifetime)

--

0.04

None

Total

(see lifetime)

-

0.3

--

Current Lifelong
Residents

Surface Soil

2E-05

None

NA

--

Sediment

NC<4)

--

NA

--

Total

2E-05

-

NA

-



Combined

6E-07

None



Aluminum,



Surface/Subsurface Soil



Manganese

Workers

Groundwater

4E-07

None

3

Trichloroethene



Total

1E-06

-

5

-

Future Industrial
Workers

Combined

Surface/Subsurface Soil

3E-06

None

0.3

None

Groundwater

8E-05

None

7

Aluminum, Cobalt,
Manganese



Total

9E-05

--

7

--



Combined

Surface/Subsurface Soil

(see lifetime)

-

5

Cobalt, Copper, Iron,
Manganese, Thallium











Tetrachloroethene,











Trichloroethene,

Future Child Resident

Groundwater

(see lifetime)

-

31

Caprolactam, 2-
Hexanone,
Aluminum, Arsenic,
Cobalt, Iron, Lead,
Manganese, Thallium



Sediment

(see lifetime)

-

0.3

None



Total

(see lifetime)

--

36

--



Combined

Surface/Subsurface Soil

(see lifetime)

-

0.5

Thallium











Tetrachloroethene,











Trichloroethene, 2-

Future Adult
Residents

Groundwater

(see lifetime)

—

23

Hexanone,
Aluminum, Arsenic,

Cobalt, Iron,
Manganese, Thallium



Sediment

(see lifetime)

--

0.04

None



Total

(see lifetime)

-

23

-



Combined

Surface/Subsurface Soil

1E-05

Benzo(a)pyrene,
Dieldrin, Naphthalene,
Arsenic

NA

-







Chloroform,













T etrachloroethene,







Future Lifelong
Residents

Groundwater

3E-04

Trichloroethene,
Vinyl Chloride, 1,4-
Dioxane,
Bis(2-
ethylhexyl)phthalate,
Arsenic

NA



-



Sediment

NC<4)

-

NA

-



Total

3E-04

-

NA

-

14


-------
Lifelong Residents

Groundwater
(Vapor Intrusion)

6E-05

( lllllilllllllillllN III
( (IIKITI1 III Risk' 1

Chloroform,
T etrachloroethene,
Trichloroethene,
Vinyl Chloride

1	- A chemical is considered to a major contributor to the cancer risk if the cumulative cancer risk is greater than lxlO"4 and the chemical
specific cancer risk is greater than lxlO"6.

2	- A chemical is considered to be a major contributor to the hazard index if the cumulative target organ hazard index is greater
than 1 and the chemical specific hazard index is greater than 0.1.

3	- Target organs HE less than 1.

4	- NC - No carcinogenic COPCs were identified for sediment, therefore cancer risks could not be calculated.

Cumulative His on a target organ basis for current industrial workers, current child residents, and current
adult residents were less than the acceptable level of 1. Cumulative His for future construction workers,
future industrial workers, future child residents, and future adult residents exceeded the acceptable level of
1. Exposures to aluminum and manganese in surface/subsurface soil and TCE in groundwater were the
contributors to the cumulative HI for future construction workers. Aluminum, cobalt, and manganese in
groundwater were the contributors to the HI for future industrial workers. Cobalt, copper, iron, manganese,
and thallium in surface/subsurface soil and PCE, TCE, caprolactam, 2-hexanone, aluminum, arsenic, cobalt,
iron, manganese, and thallium were the contributors to the HI for future child residents. Thallium in
surface/subsurface soil and PCE, TCE, 2-hexanone, aluminum, arsenic, cobalt, iron, manganese, and
thallium in groundwater were the contributors to the HI for the future adult resident. PCE and TCE pose the
greatest potential unacceptable risk to human health at the Site due to the extent of migration

Vapor Intrusion

Risks from exposures to VI were calculated using two approaches. The first approach involved evaluating
risks using the most recently collected groundwater samples. Assuming residential exposure, all sampling
points (wells) had ILCRs less than or within EPA's target risk range. All but three sampling points had an
HI less than 1. The HI exceeded one for monitoring wells MW03, MW05, and MW08S. TCE was the
primary contributor to the potential VI risks at MW03 and MW08S, while PCE was the primary contributor
to the potential VI risks at MW05.

The second approach relied upon evaluating VI risks for specific homes based on contaminant
concentrations detected during indoor air and sub-slab sampling performed in April 2019. EPA's evaluation
of the results identified current unacceptable risks in one house based upon TCE concentrations detected in
indoor air and sub-slab samples. The maximum TCE level reported for indoor air at this home was 2.7
micrograms per cubic meter (|ig/m3), which exceeded its EPA RSL of 0.21 [ig/m3. The TCE concentration
detected in the sub-slab vapor sample (220 (ig/m3) collected at this home resulted in an HQ of 3, indicating a
potential future VI risk. The sub-slab sample collected from another house contained PCE (170 (ig/m3) at a
concentration that exceeded its VISL value based on an ILCR of 1 xlO"6 and an HQ of 1, indicating potential
future risks from VI PCE exposure may also be of concern. However, PCE concentrations currently detected
in indoor air of this home were less than the applicable screening levels.

Risk from Lead

15


-------
Residential exposures to lead in soil and groundwater were evaluated using EPA's Integrated Exposure
Uptake Biokinetic (IEUBK) lead model. The results of the IEUBK model indicate that risks for current
child residents exposed to lead in surface soil do not exceed the EPA goal of no more than 5% of children
exceeding a 5 microgram per deciliter (jig/dL) blood-lead level. However, the IEUBK model also indicates
that risks to future child residents exposed to lead in both groundwater and surface/subsurface soil exceed
the EP A goal; lead in groundwater was responsible for the exceedance of the benchmark for residential
exposures to lead.

Construction and industrial worker exposures to lead in soil were evaluated using EPA's Adult Lead
Methodology. These results indicate that risks to current industrial workers and future industrial workers
and construction workers do not exceed the EPA goal of no more than 5% of children (fetuses of exposed
women) exceeding a 5 (ig/dL blood-lead level.

B.	Summary of Ecological Risk Assessment

A Screening Level Ecological Risk Assessment (SLERA) was conducted as part of the 2010 RI. Surface
water and sediment samples were collected and analyzed as part of the SLERA. The objective was to
position sampling stations upstream/off-Site to characterize background conditions and to sample
representative surface waters downstream of the Site to allow a spatial characterization of biological
condition. The SLERA concluded that COCs at the Site did not pose unacceptable risks to ecological
receptors, so the ecological risk assessment was not updated for the Supplemental RI completed in 2022.
Ecological risk will be addressed in the ROD for OU-2.

C.	Summary of Site Risks

In summary, the HHRA for the Site demonstrates the presence of unacceptable risk to human health, and
that remedial actions are necessary to reduce the risks to within or below EPA's acceptable risk range. EPA
has identified the COCs that pose the greatest potential unacceptable risk to human health and the
environment at the Site. Therefore, EPA has determined that the Selected Remedy for this Interim ROD is
necessary to protect the public health or welfare or the environment from actual or threatened releases of
hazardous substances into the environment.

VIII. REMEDIAL AC TION OBJECTIVES

Remedial Action Objectives (RAOs) are specific goals developed to address the Site COCs and exposure
pathways to protect human health and the environment. These objectives are based on available information
and standards, such as applicable or relevant and appropriate requirements (ARARs), to-be-considered
(TBC) guidance, and Site-specific risk-based levels.

The RAO established for drinking water:

•	Prevent potential human exposure to Site-related contaminants in groundwater through ingestion
above levels that pose an unacceptable risk for residential use.

The RAOs established for soil vapor and indoor air:

•	Protect current and future residents from adverse health effects that may result from exposure to
VOC-contaminated vapors attributable to the Site-related groundwater plumes.

•	Mitigate potential contaminant migration from subsurface VI into residential indoor air.

16


-------
EPA guidance states that "[a]n interim action is limited in scope and only addresses areas/media that also
will be addressed by a final site/operable unit ROD."1 Therefore, the foregoing RAOs reflect the limited
scope of this interim remedial action. By preventing human exposure to contaminated groundwater, the
interim remedial action will reduce Site risks by ensuring the public is not exposed or potentially exposed to
Site-related contaminants in groundwater at concentrations exceeding MCLs, PA medium-specific
concentrations (MSCs), or RSLs, as appropriate.

IX. SUMMARY OF REMEDIAL ACTION ALTERNATIVES

The Superfund law (CERCLA) requires that any remedy selected to address contamination at a site must be
protective of human health and the environment, cost-effective, in compliance with promulgated standards
or requirements that are determined to be ARARs, and consistent with the NCP. The three Alternatives, as
shown in Table 1, were evaluated to meet the RAOs for this interim remedial action.

Table 1: Evaluated Alternatives

Alternative

Description

1

No Action

2

Point-of-Entry Treatment Systems (POETS), VI Mitigation Systems, ICs, and

LTM

3

Public Water Line, VI Mitigation Systems, ICs, and LTM.

Alternative 1: NO ACTION

Consideration of this alternative is required by the NCP at 40 C.F.R. § 300.430(e)(6). Under Alternative 1,
no additional remedial action would be taken at the Site. The "no action" alternative serves as a basis
against which each of the other proposed remedial alternatives can be compared. Under this alternative,
the Site would remain in its present condition. Current and future residents would remain exposed to Site-
related contaminants in residential drinking water wells and to VOC-contaminated vapors attributable to the
Site-related groundwater plumes. The potential for contaminant migration from subsurface VI into
residential indoor air would remain, and existing POETs would no longer be maintained by EPA.

Alternative 2: POINT-OF-ENTRY TREATMENT SYSTEMS (POETS), VI MITIGATION
SYSTEMS, ICs, AND LTM

POETS

Under this alternative, groundwater pumped from the affected, or potentially affected, residential drinking
water wells would be treated before it reaches human receptors to meet the performance standards2 for Site

1	"A Guide to Preparing Superfund Proposed Plans, Records of Decision, and Other Remedy Selection Decision Documents"
(Office of Solid Waste and Emergency Response) (July 1999), at p. 8-2.

2	Generally, for a particular remedy component, performance standards define what that component must accomplish. Appendix
D (Performance Standards for Residential Well Water) identifies the contaminant concentration levels that would need to be met

by the POETS, if selected. For the Selected Remedy, treatment of the public water to be supplied to Site residents will be

conducted off-Site by the water company. However, as discussed below, these performance standards will be utilized, along

with other criteria (such as a buffer area), to determine which residences fall within the AOC—to be offered connection to the

water line. See also, Section XI.C, below.

17


-------
COCs in residential wells (see Appendix D) through the use of POETS. Several residences along Ash Road
and Old Wilmington Road have previously been provided with POETS where COC levels have exceeded
applicable performance standards. In addition, homes within the nearby mobile home park are also provided
with treated water from a single, common well pursuant to the 1996 Decree issued to the park
owner/operators. Under this alternative, the residents of the mobile home park would continue to receive
drinking water from the common well regulated by PADEP's Safe Drinking Water Program, and the current
POETS installed by EPA would continue to be maintained until the groundwater plumes are restored to any
future selected performance standards. New POETS would also be installed at locations within the AOC.
For cost estimating purposes, up to a total of 60 existing and new POETS may be installed and/or
maintained within the AOC, which includes residences at the Site located on Old Wilmington Road, Ash
Road, Parkesburg Road, and Donovan Drive. Additional residential well sampling may be conducted to
determine if additional residential wells would require a POETS to prevent users from consuming
contaminated groundwater.

The new POETS offered would be the same as those previously installed by EPA and currently in place at
affected homes. The POETS would consist of an inline particulate filter for pre-filtering, dual in-series
granular activated carbon (GAC) units for removing organic compounds, and an ultraviolet (UV) radiation
unit for disinfection. To assess the effectiveness of the POETS, the systems" pre-treatment, mid-treatment
and post-treatment water would be routinely monitored for VOCs, 1,4-Dioxane, and metals. Based on
operation and maintenance (O&M) of existing POETS at this Site, these systems are capable of treating low
concentrations of 1,4-Dioxane. Initially, all POETS installed and previously installed would be monitored
on a quarterly basis.

This alternative would also include periodic replacement of carbon units, pre-filter cartridge replacement, as
needed, and non-routine repairs of treatment units for both existing and newly installed systems. If
monitoring of the POETS indicates that performance standards are not being met by the current POETS,
additional cost-effective treatment systems capable of addressing Site-related COCs in residential wells
could also be installed in affected residences. However, to date, through routine monitoring, the existing
systems installed at homes at this Site have been effective at removing Site-related COCs that exceed
performance standards.

Vapor Intrusion

VI mitigation systems would be installed at residences where Site-related COC concentrations in indoor air
or sub-slab vapor are detected at levels exceeding cleanup levels for VI (See Appendix E). In affected
homes with a basement with concrete floors, a sub-slab depressurization (SSD) system would be installed.
In homes with partial concrete, stone, or earthen floors, a combination of an impermeable vapor barrier (for
the earthen floor) and an SSD system would be installed. SSD systems would not provide treatment of
indoor air. EPA will determine which homes will receive VI mitigation systems using the results of
previous or future VI sampling. VI confirmatory sampling would be conducted to ensure the mitigation
systems are functioning properly. Alternative 2 may also include monitoring of indoor air quality at affected
homes containing VI mitigation systems.

In affected homes where an SSD system cannot be installed due to the home lacking a basement, indoor
residential air would be treated using carbon filtration units to reduce VOC vapors. These units would be
equipped with fans and GAC filters. The fan draws air through the filter, which adsorbs and removes VOC
(and possibly other organic compound) vapors. Typical GAC filters would contain 15 pounds of activated
carbon and would last from 9 to 12 months with filters being replaced once on an annual basis.

18


-------
Long-term Monitoring

Residential drinking water wells with POETS would be monitored via a LTM program to evaluate the
effectiveness of the POETS in reducing COCs to respective performance standards and to determine
whether additional cost-effective treatment systems capable of addressing Site-related COCs in residential
drinking water wells need to be installed in affected residences. A total of approximately 60 residential wells
with POETS would be sampled quarterly and analyzed for all Site COCs, as described above. Sampling
frequency would initially be performed quarterly until EPA, in consultation with PADEP, determines that
sampling can be performed less frequently.

LTM for VI would consist of a minimum of annual maintenance of the VI mitigation systems at affected
residences. LTM may also consist of collecting air samples at the affected residences, where access is
granted, to assess the performance of the VI mitigation systems, and to ensure the systems are functioning
properly. Sampling frequency will initially be performed annually until EPA, in consultation with PADEP,
determines that sampling can be performed less frequently. O&M would need to continue until vapors
resulting from the contaminated groundwater meet cleanup levels. If additional buildings are constructed at
the Site, these buildings would also be included in the LTM program annual assessments, as appropriate.
Sampling results would be evaluated to assess whether there have been changes in contaminant status and
whether additional response actions are warranted. Site conditions and risks would be reviewed every five
years since contaminants would be left in place.

Institutional Controls

ICs would be implemented to prevent exposure to Site-related contaminants in groundwater by deterring the
use of untreated groundwater at properties within the AOC and to restrict any impact on the Site remedy.
The ICs would consist of the following: 1) deter the use of untreated groundwater for potable purposes; 2)
prohibit the installation of any new groundwater wells until remediation standards and protectiveness have
been achieved, unless EPA, in consultation with PADEP, gives prior written approval for such installation;
and, 3) prohibit all activities that would interfere with any component of the remedial action, unless EPA, in
consultation with PADEP, gives prior written approval for such activity.

In addition, ICs would prevent potential indoor air exposure to Site-related COCs that may volatilize from
the underlying groundwater plumes. To prevent such exposure, EPA, in consultation with PADEP, would
require prior notice of any construction of new residential or other structures intended for occupancy over or
within 100 feet of the contaminated groundwater plumes. The then current owner of such property would be
required to submit to EPA and PADEP (and local authorities as necessary) a plan to address indoor air risk
due to VI. If a new structure is constructed and it is determined that a VI mitigation system is needed,
installation of the VI mitigation system will be the responsibility of the owner.

To implement the ICs, a number of mechanisms, or layered mechanisms, could be utilized, in consultation
with PADEP. This process would involve working with the affected property owners, and, as necessary,
with local government, to implement the above activity-and-use limitations, in consultation with PADEP,
through proprietary controls (e.g., environmental covenants), governmental controls (e.g., local
rules/regulations, zoning ordinances or building codes), enforcement instruments (e.g., Federal or State
administrative orders), and/or informational devices (e.g., letters/fact sheets to the community or property
owners, deed notices, the PA Activity and Use Limitations Registry, community outreach, or advisories).
For example. Chapter 500 of the Chester County Health Department Rules and Regulations, Section 501,

19


-------
contains certain restrictions on wells. These rules/regulations require persons to obtain a permit to install,
maintain, or repair a water supply well; include water quality limits that must be met; restrict permitting of
wells within delineated Plume Areas of contaminated sites unless approved by EPA or PADEP; and require
written documentation that the installation of a well will not have any impact on the plume or remediation
effort as well as requirements for water source replacement and decommissioning of wells.

Alternative 3: PUBLIC WATER LINE, VI Mitigation Systems, ICs, and LTM

Public Water Line

Under Alternative 3, all homes within the AOC would be offered the opportunity to connect to a newly
constructed public water line. This alternative would prevent exposure to Site-related COCs by providing a
permanent alternative clean water supply to properties currently using drinking water wells within the area
of groundwater contamination.

The total number of residences to be offered connections to the water line will be determined during the
design of the water line; however, for cost estimating purposes, EP A assumes that approximately 60
residences would be connected to the water line. Based on current information, the residences located on
Old Wilmington Road, Ash Road, Parkesburg Road, and Donovan Drive, within the AOC for the COCs
identified in this Interim ROD, as delineated in Figure 3, would be offered connections to the water line.

EPA will pay for the lateral connection to the water line for the above-described properties; however, the
monthly water bill, once the residence is connected, will be the responsibility of the homeowner. Lateral
connections to the water line will only be offered to the affected or potentially affected residences at the
time of construction of the water line; connections will not be provided after the construction of the water
line has been completed.

If a homeowner chooses not to connect to the water line once it becomes available and the residence has a
POETS installed by EPA, EPA will not continue to monitor and maintain the POETS after construction of
the water line is completed. Existing POETS for those choosing to connect to the water line would be
monitored and maintained until connection to the newly constructed public water line is completed.

If a resident elects to be connected to the water line, existing drinking water wells would be completely
disconnected from the drinking water system. EPA will pay for disconnecting residential wells from the
drinking water supply. Disconnected wells would either be decommissioned or could be used for non-
potable purposes only under certain conditions as permitted by CCHD regulations. See CCHD Rules and
Regulations, Chapter 500, § 501.16 (Water Source Replacements) and § 501.16.4. Continuing to use wells
for non-potable uses would reduce the usage and cost of the public water supplied to the resident. If a
homeowner chooses to keep their residential well for non-potable uses after connection to the water line, any
required maintenance of the residential well would be the responsibility of the homeowner and the resident
must comply with the requirements of the above CCHD Regulations, including submitting a written request
to the CCHD for approval to continue to maintain the well and receiving written approval from CCHD to
maintain the well.

Additionally, a West Cain Township ordinance requires mobile home parks to connect to a water line, if one
is available. As a result, the mobile home park on-Site would be connected to the water line, which would
replace the common well that currently services the mobile home park. All connections to the municipal

20


-------
water system would require coordination with State authorities, local authorities, and residents.

EPA currently estimates that approximately 16,530 linear feet of 8-inch pipe would be installed to serve as
the water main extension. Installation of the distribution lines would require excavation along the roadways.
In addition, per township ordinance, fire hydrants would be installed, one every 600 feet, along the water
supply line. Public water distribution lines would be installed at least 36 inches below ground surface to
prevent freezing. The actual design of the water distribution system would require an engineering evaluation
to determine actual water usage, friction losses, fire protection needs, and the future growth of the service
area.

Figure 3: Route of Public Water Line



y-f r

'*¦ &S- 7 [¦ *'¦} I&r*5_ w 9

' Iff

% Vjh

-j#Tie-in to Existing Water Main

fjL m "/

M: iL

; -		

¦ ' r

Legend

I I Area of Concern
G Fire Hydrant

Existing Water Main
Proposed Water Main
I i Study Areas

& (	 I: I I §33

Jtf Mr

PROPOSED WATER MAIN EXTENSION
PREFERRED ALTERNATIVE
OLD WILMINGTON ROAD SITE
SADSBURYVILLE, PENNSYLVANIA

Vapor Intrusion

This component is identical to the VI component described for Alternative 2.

Long-term Monitoring

A public water line does not require LTM because public water is routinely sampled by the water provider
and regulated under applicable laws and regulations. LTM of the VI mitigation systems is identical to the
LTM described for Alternative 2. Site conditions and associated risks would be reviewed every five years
as part of the five-year review process because contaminants would be left in place.

21


-------
Institutional Controls

This component is identical to the ICs described for Alternative 2.

Common Elements of Alternatives 2 and 3
Common components for Alternatives 2 and 3 are as follows:

•	Installation of VI mitigation systems at residences where concentrations of Site contaminants are
detected in indoor air and/or sub-slab vapor at levels exceeding acceptable EPA risk levels and
PADEP screening values.

•	LTM would assess the progress and effectiveness of remedial actions.

•	ICs to restrict potable use of untreated groundwater within the contaminated plume along with a
prohibition on the installation of any new groundwater wells, to prohibit interference with the Site
interim remedy, and to prevent exposure to Site-related COCs via VI from contaminants in the
groundwater plume.

•	Five-year reviews to assess the implementation and performance of the remedy to ensure it remains
protective.

X. COMPARATIVE ANALYSIS OF ALTERNATIVES

A. Criteria Used to Compare Cleanup Alternatives

The remedial alternatives have been evaluated against the nine decision criteria set forth in the NCP, 40
C.F.R. § 300.430(e)(9)(iii) and listed in Table 3 below. These nine criteria are organized into three
categories: threshold criteria, primary balancing criteria, and modifying criteria. Threshold criteria must be
satisfied in order for an alternative to be eligible for selection. Primary balancing criteria are used to weigh
major trade-offs among alternatives. Modifying criteria are formally taken into account after public
comment has been received on the Proposed Plan.

In the remedial decision-making process, EPA describes the relative performance of each alternative against
the evaluation criteria and notes how each alternative compares to the other alternatives under consideration.
A detailed analysis of alternatives can be found in the FFS, which is in the Administrative Record file for
the Site.

Table 2: Evaluation Criteria for Superfund Remedial Alternatives	

1.	Overall Protection of Human Health and the Environment determines
whether an alternative can adequately protect human health and the environment by
eliminating, reducing, or controlling exposures to hazardous substances, pollutants
or contaminants to levels that do not pose an unacceptable risk.

2.	Compliance with ARARs evaluates whether an alternative meets Federal and
more stringent State environmental laws or facility siting laws, or whether a waiver

	isJiisliiieiJ	

22


-------
Primary Balancing Criteria

3. Long-term Effectiveness and Permanence considers the ability of an
alternative to maintain protection of human health and the environment over time.

4. Reduction of Toxicity, Mobility, or Volume of Contaminants through
Treatment evaluates an alternative's use of treatment to reduce the harmful effects
of principal contaminants, their ability to move in the environment, and the amount
of contamination present.

5. Short-term Effectiveness considers the length of time needed to implement an
alternative and the risks the alternative poses to workers, residents, and the
environment during implementation.

6. Implementability considers the technical and administrative feasibility of
implementing an alternative, including factors such as the relative availability of

goods and services.

7. Cost includes the estimated capital and annual operation and maintenance costs,
as well as present worth cost of an alternative. Present worth cost is the total cost of
an alternative over time in today's dollar value. Cost estimates are expected to be
accurate within a range of +50 to -30 percent.

Modifying
Criteria

8. State/ Support Agency Acceptance considers whether the State agrees with
EPA's analyses and recommendations, as described in the Feasibility Study and
Proposed Plan.

9. Community Acceptance considers whether the local community agrees with
EPA's analyses and preferred alternative. Comments received on the Proposed Plan
are an important indicator of community acceptance.

B. Detailed Analysis of Proposed Remedial Alternatives

1. Overall Protection of Human Health and the Environment

Alternative 1 (No Action) must be evaluated in accordance with CERCLA and the NCP to serve as a basis
for comparison with the other alternatives. Alternative 1 would not provide any protection of human health
and the environment because the identified risks in residential well drinking water currently not being
treated by a POETS, soil vapor and indoor air would not be addressed. This alternative would not achieve
RAOs for residential well drinking water and VI. COCs would remain at the Site at concentrations
exceeding acceptable risk levels. Alternative 1 does not meet the threshold criterion of protectiveness and
will not, therefore, be considered further.

Alternative 2 would protect human health receptors by providing safe drinking water to affected residents,
addressing VI risks, and limiting exposure to contaminated groundwater and contaminated indoor air
through ICs. However, POETS can fail if not properly maintained and monitored and result in short-term
exposure until maintenance is performed. Potential exposure to contaminated indoor air would be reduced to
acceptable levels by VI mitigation systems. The excess risk that would result from the use of untreated
contaminated residential well water would be reduced to acceptable levels by the POETS if they are
properly maintained. Long-term monitoring would be conducted to assess the performance of the POETS to
ensure performance standards are met.

Alternative 3 would protect human health receptors by providing a permanent public water supply (with
mandated monitoring requirements for the water provider) to affected residents, addressing VI risks, and
limiting exposure to contaminated groundwater and contaminated indoor air through ICs. Although both

23


-------
Alternatives 2 and 3 would provide drinking water that is required to comply with drinking water standards.
Alternative 3 would be more protective of human health because installation of the public water supply
would permanently eliminate exposure to contaminated groundwater as a drinking water source and protect
against potential emerging contaminants, such as PFAS. Exposure to potential Site-related vapor intrusion
in indoor air would be eliminated by providing VI mitigation systems for those residences impacted by
elevated concentrations of COCs in sub-slab vapor. ICs would be implemented to restrict the use of
untreated contaminated residential well water for potable purposes and limit soil gas vapor in new
construction.

2, Compliance with ARARs

Section 121(d) of CERCLA, 42 U.S.C. § 9621(d), and the NCP at 40 C.F.R. § 300.430(f)(l)(ii)(B), require
that remedial actions at CERCLA sites at least attain legally applicable or relevant and appropriate Federal
and State requirements, standards of control, and other substantive environmental protection requirements,
criteria, or limitations promulgated under Federal or State law, which are collectively referred to as
"ARARs," unless such ARARs are waived under Section 121(d)(4) of CERCLA, 42 U.S.C. § 9621(d)(4),
and the NCP at 40 C.F.R. § 300.430(f)(l)(ii)(C).

"Applicable" requirements are those cleanup standards, standards of control, and other substantive
requirements, criteria, or limitations promulgated under Federal environmental or State environmental or
facility-siting laws that specifically address a hazardous substance, pollutant, contaminant, remedial action,
location, or other circumstance at a CERCLA site. Only those State standards that are identified by a State in
a timely manner and that are more stringent than Federal requirements may be applicable.

"Relevant and appropriate" requirements are those cleanup standards, standards of control, and other
substantive requirements, criteria, or limitations promulgated under Federal environmental or State
environmental or facility-siting laws that, while not "applicable" to a hazardous substance, pollutant,
contaminant, remedial action, location, or other circumstance at a CERCLA site, address problems or
situations sufficiently similar to those encountered at the CERCLA site that their use is well-suited to the
particular site. Only those State standards that are identified by a State in a timely manner and that are more
stringent than Federal requirements may be relevant and appropriate.

EPA also considers to-be-considered materials (TBCs), along with ARARs. TBCs are non-promulgated
criteria, advisories, or guidance, issued by Federal or State government that are not legally binding and do
not have the status of potential ARARs. However, TBCs may be considered during development of
remedial alternatives. EPA may use TBCs in determining the necessary level of cleanup for protection of
human health or the environment when ARARs do not exist for particular contaminants.

ARARs for remedial action alternatives can be classified into one of the following three functional groups:

•	Chemical-Specific: Health-risk-based numerical values or methodologies that establish concentration or
discharge limits for particular contaminants. Often, these ARARs are used to determine the extent of site
remediation. In general, chemical-specific requirements are set for a single chemical or a closely related
group of chemicals. Examples include MCLs, promulgated under the Safe Drinking Water Act (SDWA)
and any more stringent Pennsylvania medium-specific concentrations (PA MSCs). Potential Federal and
more stringent State chemical-specific ARARs are identified in Appendix C.

•	Location-Specific: Requirements that restrict remedial actions based on the characteristics of the Site or
its immediate environment. Examples of these areas regulated under various Federal laws include

24


-------
floodplains, wetlands, and locations where historically significant cultural resources are present. Potential
Federal and more stringent State location-specific ARARs identified are presented in Appendix C.

• Action-Specific: Requirements that set controls or restrictions on the design, implementation, and
performance levels (including discharge limits) of activities related to the management of hazardous
substances, pollutants, or contaminants. These action-specific requirements do not in themselves
determine the remedial alternative; rather, they indicate how a selected alternative must be achieved. An
example of action-specific ARARs include the substantive requirements of the Resource Conservation
and Recovery Act (RCRA) regulations for generation, characterization, and management of hazardous
wastes. Potential Federal and more stringent State action-specific ARARs and TBCs are presented in
Appendix C.

For Alternative 2, chemical-specific ARARs for the drinking water of affected residents would be achieved
via the POETS. Alternative 2 would also comply with all location-specific and action-specific ARARs
specific to this limited action.

For Alternative 3, there are no chemical-specific ARARs for this interim action relating to the actual
treatment of public water to be supplied to Site residents via the water line because that treatment will be
performed entirely off-Site by Pennsylvania American Water, a public water system provider. Nevertheless,
Pennsylvania American Water is required to meet all applicable requirements, including treatment of
drinking water to all applicable standards. EPA has, however, identified chemical-specific ARARs for
Alternative 3 which are relevant and appropriate, along with other criteria, to determining (during design)
the actual scope of the AOC—that is, which residences are impacted, or potentially impacted, by Site-related
groundwater contamination, and as a result will be offered connection to the newly-constructed water line.
In addition, remedial activities for Alternative 3 would be designed to comply with location-specific and
action-specific ARARs identified for this interim remedial action (see Appendix C).

3. Long-Term Effectiveness and Permanence

Alternative 2 would provide long-term effectiveness via POETS, VI mitigation systems, and ICs. ICs would
prohibit property owners from using untreated contaminated residential well water as a potable supply and
limit exposure to soil gas vapor in new construction. The provision of POETS would eliminate or reduce
risks resulting from the potable use of impacted residential well water. Long-term operation and
maintenance required under Alternative 2 would include periodic servicing of the treatment units
(replacement of activated carbon, and UV bulbs). The spent carbon would need to be collected and returned
for regeneration or appropriate disposal. Risks through exposure to contaminated indoor air would be
reduced or eliminated by VI mitigation systems. LTM would effectively determine the status of residential
well water and assess the performance of the POETS as well as assessing VI mitigation systems.

Alternative 3 would prevent continued exposure to Site-related contaminants in drinking water supplies and
protect against new or emerging contaminants, such as PFAS. Potential residential well water and VI
exposures to human receptors would be reduced or eliminated by providing a public water supply and
providing VI mitigation systems. The provision of a public water line would permanently eliminate
unacceptable risks resulting from the use of contaminated residential well water with current or future
contaminants. Additionally, the POETS provided under Alternative 2 have the potential to fail and result in
short-term exposure until maintenance is performed, making Alternative 3 more effective in the long-term.
Indoor air may be initially monitored annually and then less frequently as determined by EPA, in
consultation with PADEP. O&M would need to continue until vapors resulting from the contaminated

25


-------
groundwater meet cleanup criteria. Risks from exposure to contaminated indoor air would be reduced to
acceptable levels by the VI mitigation systems.

4.	Reduction of Toxicity, Mobility, or Volume through Treatment

Alternative 2 and Alternative 3 would not reduce the toxicity, mobility, and volume of contaminated
groundwater at the Site since these alternatives do not treat the contaminated groundwater. Groundwater will
be addressed in a future OU-2 ROD. Alternative 2 and 3 would eliminate exposure to COCs present in
indoor air using VI mitigation systems. Alternative 2 would reduce exposure to Site COCs in impacted
residential wells through the use of POETs and Alternative 3 would eliminate exposure to impacted
residential wells with a public water line.

5.	Short-Term Effectiveness

Implementation of Alternative 2 would only minimally impact the local community or the environment in
the short-term. No significant remediation or construction impacts would be realized other than measures
taken at individual homes. Exposure of workers to COC concentrations during installations and subsequent
O&M of POETS and VI mitigation systems would be minimized by wearing appropriate personal protective
equipment and complying with Site-specific health and safety procedures.

Implementation of Alternative 3 would pose some short-term risks to the local community, the remedial
workers, or to the environment. During construction, the delivery of pipes, roadway excavation, and
installation of the public water line would likely cause some hindrances to local vehicular traffic and some
congestion. Establishment of proper construction traffic controls (e.g., flashing lights, signs, flags), as
necessary, would minimize the chance of accidents. The greatest impact to the community, particularly
nearby residents, would be noise and dust. Construction would be restricted to reasonable hours, and dust
would be controlled using controls such as dust suppression by wetting. Proper construction and industrial
safety practices would be implemented during installation of VI mitigation systems, the public water line,
and connections of the public water supply line to individual homes.

6.	Implementability

Both Alternatives 2 and 3 are readily implementable, however. Alternative 3 may take longer to implement
given the coordination required for construction. The POET and VI mitigation systems can be readily
obtained and installed, and qualified firms are available for this work. Common industrial techniques and
equipment could be used for installation and O&M of these systems. Sampling and analysis of residential
well water would be readily implementable, with appropriate coordination with the homeowner. Although
POETS are already in place at some residences currently impacted by contaminated groundwater, all
POETS installed would require regular maintenance for a presumed period of 30 years, or until Site COC
performance standards are met.

The water line and lateral water service connections could be installed using standard construction
techniques and equipment. However, coordination with the water company, municipa 1/township authorities,
other local agencies, and affected property owners would be needed to construct the water line and connect
residences.

7.	Cost

26


-------
The estimated cost information for Alternatives 2 and 3, as summarized below, was developed using a
presumed 30-year period and assumed that 60 homes would have POETS installed or a connection to a
water line. Capital costs were estimated for construction, remedial design, work plan development,
construction management, administration, and contingency. Annual O&M costs were also estimated. The
present worth costs of each proposed alternative were determined as expressed in today's dollars. Total
estimated costs, including capital and annual O&M costs are presented below with an accuracy of -30% to
+50%. See Appendix B of the FFS for detailed Cost Estimates.

Table 3: Estimated Costs of Alternatives 2 and 3



Capital
Costs

Annual O&M
Costs

Five-Year Review

Present-Worth Cost

Alternative 2

$884,800

range from
$438,300 to
$840,800

$40,000

$1 1,694,000

Alternative 3

$7,500,300

$14,000

$40,000

$7,786,000

8.	State Acceptance

EPA has coordinated closely with PADEP in the preparation and evaluation of this Interim ROD. PADEP
concurs with the Selected Remedy for OU-1 (Appendix G).

9,	Community Acceptance

EPA received a variety of comments and questions concerning the proposed water line. A majority of the
comments received from the local community expressed support for EPA's Preferred Alternative. Some of
the comments from the local community identified a preference for the POETS. Community comments and
EPA's response to such comments are included in the Responsiveness Summary section of the Interim ROD

for OU-1.

XI. SELECTED REMEDY

The Selected Remedy for OU-1 is Alternative 3, Public Water Line, VI Mitigation Systems, ICs, and LTM,
as described in detail in Section IX, Alternative 3, above. Under this interim remedial action, EPA will:

•	Offer to connect all properties within the AOC, i.e., those properties whose residential wells are
currently contaminated with Site-related COCs, as well as those properties whose residential wells
could potentially become contaminated with Site-related COCs, to a newly constructed public water
line;

•	Offer to provide VI mitigation systems at residences where COC concentrations in indoor air are
detected at levels exceeding cleanup levels for VI;

•	Perform LTM of the VI mitigation systems to assess the effectiveness of the systems; and

•	Implement ICs to prevent exposure to Site-related contaminants in groundwater by deterring the use
of untreated groundwater at properties within the AOC, to restrict any impact on the Site remedy,
and to prevent exposure to Site-related COCs via VI through a notification and reporting process
relating to new construction in potentially affected areas.

27


-------
A.	Summary of the Rationale for the Selected Remedy

Alternative 3 is more protective of human health than Alternative 2 because extension of the public water
supply would permanently eliminate the potential use of contaminated groundwater as a drinking water
source and protect against potential emerging contaminants, such as PFAS. Additionally, Alternative 3
would provide drinking water that is required to comply with drinking water standards. The POETS
provided under Alternative 2 can fail and result in short-term exposure until maintenance is performed,
making Alternative 3 more effective in the long-term. Alternative 3 is also readily implementable with
relatively limited short-term impacts and more cost-effective compared to Alternative 2.

Based on the information available at this time, EPA has concluded that the Selected Remedy (Alternative 3:
Public Water Line, VI Mitigation Systems, ICs, and LTM) meets the threshold criteria and provides the best
balance of trade-offs when compared to the other alternative for OU-1 with respect to the balancing criteria.
EPA expects the Selected Remedy to satisfy the following statutory requirements of CERCLA Section
121(b): 1) to be protective of human health and the environment; 2) to comply with ARARs (or justify a
waiver); 3) to be cost-effective; and 4) to utilize permanent solutions and alternative treatment technologies
or resource recovery technologies to the maximum extent practicable. With respect to the fifth statutory
requirement, i.e., to satisfy the preference for treatment as a principal element (or justify not meeting the
preference), the Selected Remedy does not satisfy the preference for treatment as a principal element.
However, it does permanently eliminate or reduce the exposure pathway to contaminated groundwater via
residential wells and VI into homes. The final remedial action for the Site, which will be proposed in a
future Proposed Plan for OU-2 and subject to public participation requirements, will address the remaining
contaminated media at the Site, including contaminated soil and groundwater.

B.	Summary of the Estimated Costs

The cost of Alternative 3 is estimated to be $7,786,000, which is less than the estimated cost of
$1 1,694,000 for Alternative 2.

C.	Performance Standards

For the Selected Remedy under this Interim ROD for OU-1, the performance standards for addressing COCs
in residential well water are identified in Appendix D. As discussed above, these performance standards do
not apply to the off-Site treatment, under applicable law, of public water to be supplied by PA American
Water to Site residents via the newly installed water line. These performance standards are, however,
contaminant concentration levels that will be used during remedial design, among other criteria, to delineate
the AOC. Homes in the AOC will be offered a water line connection (currently depicted in Figure 3). The
AOC is defined as the area overlying the Site groundwater plumes and investigation areas as well as a buffer
area around the plumes. The buffer area will also be determined more precisely during the design of the
water line. All homes within the AOC will be offered a connection to the water line.

For this interim remedial action, performance standards for COCs in contaminated residential well water,
measured in micrograms per liter (ug/L), were established to delineate the AOC for placement of the water
line to protect human health. These performance standards were primarily based on Federal MCLs or more
stringent P A MSCs. If MCLs or MSCs were not available, then performance standards were developed
based on EPA RSLs, which are risk-based (tapwater RSLs based on ILCR of 1E-5 or HQ of 0.5) unless
background levels or the analytical detection limits were higher. It should be noted that EPA RSLs are non-

28


-------
mandatory standards which can, nevertheless, be used as the drinking water standards for the affected
residences at the Site, as necessary to ensure protection of public health.

Cleanup levels for the VI pathway were based on EPA RSLs and Vapor Intrusion Screening Levels (VISLs),
and PADEP soil gas and indoor air screening values. It should be noted that EPA RSLs and VISLs and
PADEP soil gas and indoor air screening values are non-mandatory standards. Cleanup levels selected for
VI are identified in Appendix E.

D. Expected Outcome of the Selected Remedy

The Selected Remedy is expected to meet all RAOs for this Interim ROD.

The RAO established for drinking water:

•	Prevents potential human exposure to Site-related contaminants in groundwater through ingestion
above levels that pose an unacceptable risk for residential use.

RAOs established for soil vapor and indoor air:

•	Protects current and future residents from adverse health effects that may result from exposure to
VOC-contaminated vapors attributable to the Site-related groundwater plumes.

•	Mitigates potential contaminant migration from subsurface VI into residential indoor air.

XII. STATUTORY DETERMINATIONS

The OU-1 Selected Remedy is protective of human health and the environment, complies with Federal
and State requirements that are legally applicable or relevant and appropriate to the remedial action, is
cost-effective, and utilizes permanent solutions to the maximum extent practicable.

Because the Selected Remedy will result in hazardous substances remaining on site above levels that
allow for unlimited use and unrestricted exposure, a review will be conducted within five years after
commencement of the Selected Remedy to ensure that the remedy continues to provide adequate
protection of human health and the environment. Such reviews will be conducted a minimum of every
five years thereafter, until EPA determines that hazardous substances remaining at the Site do not
prevent unlimited use and unrestricted exposure at the Site.

A. Compliance with Applicable or Relevant and Appropriate Requirements

An interim action must comply with (or waive) those Federal and State requirements that are applicable or
relevant and appropriate to the limited-scope action. Therefore, the focus is only on those ARARs specific
to this interim action (e.g., chemical-specific ARARs associated with POETS or hazardous waste
management regulations during remedy implementation). While the final remedial action for OU-2 will
address the remaining Site-related contamination in soil and groundwater, this interim remedial action for
OU-1 will implement limited action to prevent human exposure to contaminated groundwater in residential
wells and mitigate VI infiltration emanating from the groundwater. The final remedial action for OU-2,
after any necessary public participation requirements are met, will address the remaining unacceptable risks
presented by the Site.

A complete list of ARARs and TBCs for the Selected Remedy for OU-1 is provided in Appendix C. The
major ARARs identified therein include, but are not limited to:

29


-------
•	Maximum Contaminant Levels (MCLs), 40 C.F.R. §§ 141.61 and 141.62, which establish health-
based standards for certain organics and inorganics for public drinking water, to be used as
standards to delineate the AOC for placement of the water line.

•	PA Statewide Health Standards, Medium-Specific Concentrations (MSCs), 25 PA Code
§250.304, to be used as standards to delineate the AOC for placement of the water line where
there are no MCLs.

•	The substantive standards under PA Safe Drinking Water Regulations, 25 PA Code Chapter 109,
Subchapter F, that are relevant to design and construction of a water line and/or laterals.

•	Substantive PA Standards applicable to generators of hazardous waste, as defined by 25 PA Code
§ 261 a.3(b), during remedial action.

•	Substantive PA requirements for erosion and sediment control, to be applied during the
construction of the water line.

B.	Cost Effectiveness

The NCP at 40 C.F.R. § 300.430(f)(l)(ii)(D), requires EPA to evaluate cost-effectiveness by comparing
all the alternatives meeting the threshold criteria: protection of human health and the environment; and
compliance with ARARs against long-term effectiveness and permanence.

The Selected Remedy is cost-effective in providing overall protection of human health and the environment
by limiting the risk posed by Site COCs and meets all other requirements of CERCLA and the NCP at a cost
that is proportional to the other alternatives that were evaluated. Further, the Selected Remedy is readily
implementable and provides a high degree of both short- and long-term effectiveness. The estimated
present value of the selected remedial action is approximately $7,786,000.

C.	Utilization of Permanent Solutions and Alternative Treatment Technologies to the
Maximum Extent Practicable and Preference for Treatnient as a Principal
Element

The Selected Remedy is an interim remedial action and is not intended to treat contamination or
provide a permanent solution to contamination in groundwater. A future decision document will address
remaining contamination present in soils and groundwater at the Site, for both OU-1 and OU-2

D.	Five Year Review Requirements

Section 121(c) of CERCLA and Section 300.430(f)(4)(ii) of the NCP require review of a remedy if the
remedy results in hazardous substances, pollutants, or contaminants remaining on-site above levels that
allow for unlimited use and unrestricted exposure. Any such review must be conducted no less often
than every five years after initiation of the remedial action.

Because hazardous substances will remain at the Site, the review described by Section 121(c) of
CERCLA and Section 300.430(f)(4)(ii) of the NCP will be conducted no less often than every five
years after initiation of the remedial action.

E.	Documentation of Significant Changes

The Proposed Plan was released for public comment on September 28, 2022. EPA has reviewed all
comments submitted during the public comment period and determined that no significant changes were

30


-------
necessary or appropriate to the remedy, as originally identified in the Proposed Plan.

XIII. RESPONSIVENESS SUMMARY

The 30-day public comment period opened on September 28, 2022 and closed on October 28, 2022.
During this time, EPA received a variety of comments and questions, including those raised at the
public meeting. Responses to significant comments received during the public comment period can be
found in the Responsiveness Summary included in this Interim Record of Decision as Appendix B.

31


-------
APPENDIX A
ADMINISTRATIVE RECORD INDEX

32


-------
UNITED STATES ENVIRONMENTAL PROTECTION AGENCY

REGION 111
1600 John F. Kennedy Blvd.

Philadelphia, Pennsylvania 19103

OLD WILMINGTON ROAD GW CONTAMINATION
REMEDIAL ADMINISTRATIVE RECORD FILE

INDEX OF DOCUMENTS
AVAILABLE 9/28/2022, UPDATED //2023

https://semspub.epa.gov/src/collection/03/AR67242


-------
Introduction

The "Administrative Record" is the collection of documents which form the basis for the U. S.
Environmental Protection Agency's (EPA) selection of a response action at a Superfund site.
Superfund is the name given to the Comprehensive Environmental Response, Compensation,
and Liability Act (CERCLA) which can be found in Title 42 of the U.S. Code (U.S.C.) at Sections
9601 through 9675. Response actions under Superfund can be either "removal actions" or
"remedial actions." As the EPA decides what to do at the site of a release of hazardous
substances, the EPA compiles documents concerning the site and EPA's decision into an
"Administrative Record File." Documents may be added to the Administrative Record File from
time to time. Once the EPA Regional Administrator or the Regional Administrator's delegate
signs the decision document memorializing the selection of an action, the documents which
form the basis for the selection of an action are known as the "Administrative Record." An
Administrative Record file is required by CERCLA, as amended by the Superfund Amendments
and Reauthorization Act (SARA).

The Administrative Record will be available for public review during normal business hours in an
electronic computer imaged format at the selected repository and by appointment only at the
Environmental Protection Agency (EPA), Region 3 office which is located at the address given on
the cover page. The Administrative Record is treated as a non-circulating reference document.
Individuals may review documents contained in the Administrative Record, according to the
procedures at the local repository and at the EPA Region 3 office. The Administrative Record
will be maintained at the repository until further notice. EPA may send additional documents to
the repository as work progresses at the Site. The EPA may hold formal public comment periods
at certain stages of the response process. The public is urged to use the formal public comment
periods to submit written comments to the EPA regarding the actions at the Site.

Except as explained below, this index and the record were compiled in accordance with the
EPA's Revised Guidance on Compiling Administrative Records for CERCLA Response Actions,
EPA/OSRE/OEM/OSRTI (September 20, 2010), and/or in accordance with Superfund Removal
Procedures Public Participation Guidance for On-Scene Coordinators: Community Relations and
the Administrative Record, OSWER 9360.3-05 (July 1992), and/or the National Oil and
Hazardous Substances Pollution Contingency Plan (NCP), 40 CFR Part 300. Consistent with 40
CFR Sections 300.805 (a) (2), and 300.810 (a) (2), Region 3 has listed, in the Administrative
Record Index (or in bibliographies of documents listed in the Index), guidance documents which
may form a basis for the selection of this response action (EPA Guidance Documents, Non-Site
Specific). Unless the guidance documents indexed were generated specifically for the Site, the
guidance documents may not be present in the Administrative Record. However, it should be
noted that the EPA does maintain an extensive collection of Superfund response action
guidance documents available in electronic format on the EPA website at:
https://www.epa.eov/superfund/superfund-policv-guidance-and-laws.

2


-------
Additionally, the EPA guidance related to Superfund cleanup enforcement may be found on the
website at the following address:

http://cfpub.epa.gov/compliance/resources/policies/cleanup/superfund.

This page is titled, "Superfund Cleanup Policies and Guidance."

The Administrative Record is listed in chronological order with the earliest dated document at
the top and followed by documents which may be "Undated."

Throughout the Administrative Record File, EPA has redacted certain documents to protect
against the disclosure of potential confidential business information and/or information
which may involve personal identifiable information or a protected interest, The redactions
are evident from the face of the particular document and the word "Redacted" appears in the
title on the index.

Documents listed as bibliographic sources for other documents in the record might not be
listed separately in the Site Index.

The documents in the Old Wilmington Road GW Contamination Removal Administrative
Record File dated 9/3/2019 are herein incorporated by reference, and the index of documents
is attached.

3


-------
OLD WILIMINGTON ROAD	OU 1 REMEDIAL ADMINISTRATIVE RECORD FILE

GW CONTAMINATION	INDEX OF DOCUMENTS	In CHRONOLOGICAL Order

Updated //2023

DOC ID

DOC DATE

TITLE

PAGE COUNT

ADDRESSEE NAME

AUTHOR NAME

2335756

09/26/1996

PARTIAL CONSENT DECREE - CIVIL ACTION NO. 95-5578 -
PERRY PHILLIPS MOBILE HOME PARK

22



BUCKWALTER,WAYNE (WERNER WOOD &
BUCKWALTER) | HERMAN,STEVEN,A
(EPA) | MCCABE,W MICHAEL
(EPA) | MENTZINGER,RICHARD (US
ATTORNEY OFFICE) | PHILLIPS,JEANNE
(PERRY PHILLIPS MOBILE HOME
PARK) | PHILLIPS,PERRY (PERRY PHILLIPS
MOBILE HOME PARK) |SCHIFFER,LOIS,J
(US DEPT OF JUSTICE)

2335755

12/13/2000

REDACTED PUBLIC HEALTH ASSESSMENT

46



(ATSDR) | (PA DEPT OF HEALTH)

2335752

07/16/2015

REDACTED SAMPLING & ANALYSIS PLAN (SAP) FOR
SUPPLEMENTAL REMEDIAL INVESTIGATION (Rl) ACTIVITIES

113

(EPA)

(TETRATECH)

2335757

03/18/2022

PA STATE HISTORIC PRESERVATION OFFICE ENVIRONMENTAL
REVIEW SUMMARY LETTER

2

OKORN,BARBARA (EPA)

DIEHL,EMMA (PA STATE HISTORIC
PRESERVATION OFFICE)

2335759

05/01/2022

REDACTED SUPPLEMENTAL REMEDIAL INVESTIGATION (Rl)
REPORT - MAIN REPORT, TABLES & FIGURES

173

(EPA)

(TETRA TECH)

2335761

05/01/2022

REDACTED SUPPLEMENTAL REMEDIAL INVESTIGATION (Rl)
REPORT - APPENDIX A - BORING LOGS & WELL CONSTRUCTION
LOGS - 2016 INVESTIGATION

70

(EPA)

(TETRATECH)

2335763

05/01/2022

REDACTED SUPPLEMENTAL REMEDIAL INVESTIGATION (Rl)
REPORT - APPENDIX B - GEOPHYSICAL LOGS - 2016
INVESTIGATION

81

(EPA)

(TETRATECH)

2335765

05/01/2022

REDACTED SUPPLEMENTAL REMEDIAL INVESTIGATION (Rl)
REPORT - APPENDIX C - PACKER TEST ANALYTICAL RESULTS

118

(EPA)

(TETRA TECH)

2335766

05/01/2022

SUPPLEMENTAL REMEDIAL INVESTIGATION (Rl) REPORT-
APPENDIX D - GROUNDWATER SAMPLING LOGS

59

(EPA)

(TETRATECH)

2335768

05/01/2022

REDACTED SUPPLEMENTAL REMEDIAL INVESTIGATION (Rl)
REPORT - APPENDIX E - HUMAN HEALTH RISK ASSESSMENT
(HHRA)

812

(EPA)

(TETRATECH)

2335770

05/01/2022

REDACTED SUPPLEMENTAL REMEDIAL INVESTIGATION (Rl)
REPORT - APPENDIX F - REMEDIAL INVESTIGATION - 2010

7052

(EPA)

(TETRATECH)

2335772

05/01/2022

REDACTED SUPPLEMENTAL REMEDIAL INVESTIGATION (Rl)
REPORT - APPENDIX G - RAW ANALYTICAL DATA

872

(EPA)

(TETRATECH)

4


-------
OLD WILIMINGTON ROAD	OU 1 REMEDIAL ADMINISTRATIVE RECORD FILE

GW CONTAMINATION	INDEX OF DOCUMENTS	In CHRONOLOGICAL Order

Updated //2023

DOC ID

DOC DATE

TITLE

PAGE COUNT

ADDRESSEE NAME

AUTHOR NAME

2335774

05/01/2022

REDACTED SUPPLEMENTAL REMEDIAL INVESTIGATION (Rl)
REPORT - APPENDIX H - VAPOR INTRUSION SAMPLING RESULTS
- 2019

156

(EPA)

(TETRATECH)

2335750

06/01/2022

REDACTED FOCUSED FEASIBILITY STUDY (FFS)

117

(EPA)

(TETRATECH)

2336313

09/28/2022

OU 1 PROPOSED REMEDIAL ACTION PLAN (PRAP)

35



(EPA)

2342539

09/28/2022

PUBLIC NOTICE: PROPOSED CLEANUP PLAN AVAILABLE FOR
PUBLIC COMMENT

1



(EPA)

2336319

10/01/2022

COMMUNITY UPDATE: EPA PROPOSES INTERIM CLEANUP IN A
PROPOSED PLAN

4



(EPA)

2342527

10/11/2022

OU 1 PROPOSED REMEDIAL ACTION PLAN (PRAP) PUBLIC
MEETING TRANSCRIPT

118



(LEXITAS LEGAL)

2342529

10/16/2022

REDACTED PUBLIC COMMENT ON OU 1 PROPOSED REMEDIAL
ACTION PLAN (PRAP)

1

SHANDRUK,IRENE (EPA)

(RESIDENT)

2342531

10/21/2022

REDACTED PUBLIC COMMENT ON OU 1 PROPOSED REMEDIAL
ACTION PLAN (PRAP)

1

SHANDRUK,IRENE (EPA)

(RESIDENT)

2342526

04/05/2023

PADEP LETTER OF CONCURRENCE WITH OU 1 INTERIM
RECORD OF DECISION (ROD)

2

LEONARD,PAUL (EPA)

PATTERSON,PATRICK (PA DEPT OF
ENVIRONMENTAL PROTECTION (PADEP))

5


-------
OLD WILMINGTON ROAD GW CONTAMINATION

REMOVAL ADMINISTRATIVE RECORD FILE * A
INDEX OF DOCUMENTS

I. FACTUAL INFORMATION/DATA

1.	Sample results taken from the Perry Phillips Mobile
Home Park, 8/88 through 11/92. P. 100001-100002.

2.	Pennsylvania Department of Environmental Resources
(PADER) Safe Drinking Water Act, Inorganic/Organic
Chemical and Radiological Analysis, Perry Phillips
Landfill, Contamination Identification numbers 2969,
2976, 2977, 2980, 2981, 2982, 2984, and 2990, 6/5/91
through 11/13/92. P. 100003-100015. Four Special
Analysis Reports are attached.

3.	Result Summary package of Volatile Organic Analysis
Data, sample numbers A1431 through A1439, 4/16/92.
P. 100016-100025.

4.	Report: EPA Region III Central Regional Laboratory,
Perry Phillips Mobile Home Park, SDWA AUH03N0AF,
REQ9300 013, prepared by U.S. EPA, 12/30/92.

P. 100026-100040.

5.	Letter to Mr. Perry Phillips from Mr. Bill Foster,
U.S. EPA, re: Results of samples taken from the
Phillips Household and the Perry Phillips Mobile Home
Park, 1/20/93. P. 100041-100042.

6.	Emergency Response Notification System (ERNS) Incident
Notification Report, Perry Phillips Landfill, 1/21/93.
P. 100043-100043.

7.	Memorandum to Mr. Gregg Crystall, U.S. EPA, from Mr.
Bill Foster, U.S. EPA, re: Site background
information, 1/21/93. P. 100044-100044.

Administrative Record File available 4/1/94, updated
4/13/99 and 9/3/19.

A This site was formerly referred to as Perry Phillips
Landfill.


-------
8.	U.S. EPA Pollution Report #1, Perry Phillip Landfill,
3/2/93. P. 100045-100045.

9.	Analytical Report Number 1303013, prepared by Roy F.
Weston, Inc., 3/18/93. P. 100046-100059.

10.	Memorandum to Mr. Mike Towle, U.S. EPA, from Ms.

Marian Murphy, Roy F. Weston, Inc. , re: Transmittal
of a report reviewing the data package for 11 water
samples and 1 field blank collected on March 2, 1992,
3/23/93. P. 100060-100090. The review report is
attached.

11.	Memorandum to Mr. Mike Towle, U.S. EPA, from Mr.
Christopher P. Guy, Roy F. Weston, Inc., re: Summary
of a Technical Assistance Team (TAT) site inspection
visit to collect water samples, 7/8/93. P. 100091-
100093. A site map is attached.

12.	U.S. EPA Pollution Report #2, Perry Phillip Landfill,
9/9/93. P. 100094-100094.

13.	Princeton Testing Laboratory Inc., samp1e analysis
summary for volatile organics, priority pollutants,
and EPA 624, 12/15/93. P. 100095-100105.

14.	U.S. EPA Pollution Report #3, Perry Phillip Landfill,
12/20/93. P. 100106-100106.

15.	Summary of Section 1431 of the Safe Drinking Water Act
proposed to be enforced for the site, (undated).

P. 100107-100107.

16.	Figure 5.3, Home Well Samp1e Locations, Perry Phillips
Landfill, prepared by NUS Corporation, (undated) .

P. 100108-100112. The following are attached:

a.	Figure 2.2, Site Sketch;

b.	Figure 2.3, Site Sketch;

c.	a Samp1e Log;

d.	a Samp1e Data Summary.

17.	Organic Data Validation Report for Case	* *
Number 47227, Samp1e Delivery Group Number C07P6,
12/22/17. P. 100113-100163. A December 26, 2018
transmittal memorandum and November 2017

Samp1e Summary Report are attached.


-------
18.	Organic Data Validation Report for Case

Number 47227, Sample Delivery Group Number C07L7,
1/2/18. P. 100164-100225. A February 8, 2018
transmittal memorandum and November 2017 Sample
Summary Report are attached.

19.	Organic Data Validation Report for Case

Number 47227, Sample Delivery Group Number C07L8,
1/19/18. P. 100226-100283. A January 26, 2018
transmittal memorandum and November 2017 Sample
Summary Report are attached.

20.	Organic Data Validation Report for Case

Number 47227, Sample Delivery Group Number C07Q8,
1/26/18. P. 100284-100344. A February 8, 2018
transmittal memorandum and November 2017 Sample
Summary Report are attached.

21.	Organic Data Validation Report for Case

Number 47227, Sample Delivery Group Number MC07L7,
1/29/18. P. 100345-100383. A February 14, 2018
transmittal memorandum and November 2017 Sample
Summary Report are attached.

22.	Organic Data Validation Report for Case

Number 47227, Sample Delivery Group Number MC07R4,
1/29/18. P. 100384-100419. A February 14, 2018
transmittal memorandum and November 2017 Sample
Summary Report are attached.

23.	Organic Data Validation Report for Case

Number 47227, Sample Delivery Group Number MC07S8,
1/29/18. P. 100420-100463. A February 14, 2018
transmittal memorandum and November 2017 Sample
Summary Report are attached.

Document has been redacted due to confidential
business information and/or to protect the privacy of
individuals. Redactions are evident from the face of
the document.

3


-------
24.	Organic Data Validation Report for Case	* *
Number 47227, Sample Delivery Group Number MC07L8,
1/30/18. P. 100464-100506. A February 14, 2018
transmittal memorandum and November 2017 Sample
Summary Report are attached.

25.	Organic Data Validation Report for Case	* *
Number 47227, Sample Delivery Group Number MC07P1,
1/30/18. P. 100507-100531. A February 14, 2018
transmittal memorandum and November 2017 Sample
Summary Report are attached.

26.	Organic Data Validation Report for Case	* *
Number 47227, Sample Delivery Group Number MC07P3,
1/30/18. P. 100532-100574. A February 14, 2018
transmittal memorandum and November 2017 Sample
Summary Report are attached.

27.	Organic Data Validation Report for Case	* *
Number 47227, Sample Delivery Group Number MC0B18,
1/31/18. P. 100575-100592. A February 14, 2018
transmittal memorandum and November 2017 Sample
Summary Report are attached.

28.	Organic Data Validation Report for Case	* *
Number 47227, Sample Delivery Group Number C07W0,
2/1/18. P. 100593-100636. A February 13, 2018
transmittal memorandum and November 2017 Sample
Summary Report are attached.

29.	Electronic Memorandum to Mr. Eduardo Rovira, U.S. EPA,
from Mr. Rombel Arquines, U.S. EPA, re: Sampling
results for lead on residential property, 4/16/18.

P. 100637-100637.

30.	Electronic Memorandum to Ms. Dawn Ioven, U.S. EPA, and
Mr. Eduardo Rovira, U.S. EPA, from Mr. Martin
Gehlhaus, U.S. EPA, re: Type of Removal Action,
4/17/18. P. 100638-100640.

31.	Electronic Memorandum to Mr. Martin Gehlhaus, U.S. EPA
and Mr. Eduardo Rovira, U.S. EPA, from Ms. Dawn Ioven,
U.S. EPA, re: Levels of manganese in residential
sampling, 4/17/18. P. 100641-100643.

4


-------
32.	Electronic Memorandum to Mr. Eduardo Rovira, U.S. EPA,
from Mr. Rombel Arquines, U.S. EPA, re: Questions
about Action Memorandum, 4/20/18. P. 100644-100647.

33.	Electronic Memorandum to Ms. Mary Rugala, U.S. EPA,
and Mr. Eduardo Rovira, U.S. EPA, from Mr. Rombel
Arquines, U.S. EPA, re: Transmittal of site-related
removal documents, 4/23/18. P. 100648-100674.
Pollution Reports 1-12, a January 21, 1993 Incident
Notification Report, and the December 21, 1993 Special
Bulletin A are attached.

34.	Electronic Memorandum to Ms. Mary Rugala, U.S. EPA,
and Mr. Eduardo Rovira, U.S. EPA, from Mr. Rombel
Arquines, U.S. EPA, re: Transmittal of Action
Memorandums, 4/23/18. P. 100675-100685. The May 4,
1994 Action Memorandum is attached.

35.	Electronic Memorandum to Ms. Mary Rugala, U.S. EPA, * *
and Mr. Eduardo Rovira, U.S. EPA, from Mr. Rombel
Arquines, U.S. EPA, re: Residential well water
sampling, 4/23/18. P. 100686-100691. Letters to two
residents are attached.

36.	Electronic Memorandum to Ms. Mary Rugala, U.S. EPA, * *
and Mr. Eduardo Rovira, U.S. EPA, from Mr. Rombel
Arquines, U.S. EPA, re: Transmittal of site parcel
map, 4/24/18. P. 100692-100693. Site parcel map
attached.

37.	Electronic Memorandum to Mr. Rombel Arquines, U.S.
EPA, from Mr. Eduardo Rovira, U.S. EPA, re: Site
description, 4/24/18. P. 100694-100694.

38.	Electronic Memorandum to Mr. Rombel Arquines, U.S.
EPA, and Mr. Alexander Mandell, U.S. EPA, from Mr.
Eduardo Rovira, U.S. EPA, re: Bottled water delivery
to residents, 4/24/18. P. 100695-100695.

5


-------
39.	Organic Data Validation Report for Case	* *
Number 47596, Sample Delivery Group Number MC07X1,
7/2/18. P. 100696-100740. A July 9, 2018 transmittal
memorandum and May 2 018 Sample Summary Report are
attached.

40.	Organic Data Validation Report for Case	* *
Number 47596, Sample Delivery Group Number C0807,
7/10/18. P. 100741-100821. A July 17, 2018
transmittal memorandum and May 2018 Sample Summary
Report are attached.

41.	Organic Data Validation Report for Case	* *
Number 47596, Sample Delivery Group Number MC0801,
7/10/18. P. 100822-100875. A July 17, 2018
transmittal memorandum and May 2018 Sample Summary
Report are attached.

42.	Organic Data Validation Report for Case	* *
Number 47596, Sample Delivery Group Number MC0839,
7/11/18. P. 100876-100909. A July 17, 2018
transmittal memorandum and May 2018 Sample Summary
Report are attached.

43.	Electronic Memorandum to Mr. Eduardo Rovira,	* *
U.S. EPA, from Mr. Rombel Arquines, U.S. EPA, re:
Results of residential well sampling, 9/14/18.

P. 100910-100915. Four maps of sampling locations
with handwritten notes are attached.

44.	Electronic Memorandum to Mr. Eduardo Rovira,	* *
U.S. EPA, and Mr. Rombel Arquines, U.S. EPA, from Mr.
Martin Gehlhaus, U.S. EPA, re: Concentration of
manganese in residential water, 9/26/18. P. 100916-
100920 .

45.	Electronic Memorandum to Mr. Eduardo Rovira,	* *
U.S. EPA, from Mr. Rombel Arquines, U.S. EPA, re:

Water softening manganese treatment system , 10/9/18.
P. 100921-100927. A September 26, 2018 proposal, a
system specification sheet, and an October 8, 2018
email to Mr. Rombel Arquines, U. S. EPA, are attached.

6


-------
46.	Electronic Memorandum to Mr. Eduardo Rovira, U.S. EPA,
from Mr. Rombel Arquines, U.S. EPA, re: Location of
data on share drive, 11/6/18. P. 100928-100928.

47.	Electronic Memorandum to Mr. Eduardo Rovira,	* *
U.S. EPA, from Mr. Rombel Arquines, U.S. EPA, re:
Transmittal of Draft Action Memorandum, 11/29/18.

P. 100929-100930.

7


-------
II . DECISION DOCUMENTS

1.	Special Bulletin A memorandum to the Regional Response
Center, U.S. EPA, from Mr. Michael Towle, U.S. EPA,
re: Notification of $50,000 activation, 12/21/93.

P. 200001-200004.

2.	Memorandum to Mr. Elliot Laws, U.S. EPA, from Mr.
Stanley Laskowski, U.S. EPA, re: Approval of
Additional Funding and Exemption from the 12-Month
Statutory Limit, 2/4/94. P. 200005-100019. A
memorandum regarding a Request for Additional Funding
and Exemption from the 12-Month Statutory Limit and a
Special Bulletin A memorandum dated December 21, 1993
regarding the $50,000 activation are attached.

3.	Memorandum to Mr. Timothy Fields, U.S. EPA, from Mr.
Abraham Ferdas, U.S. EPA, re: Approval of a request
for additional funding for continued removal actions
at the site, 11/24/98. P. 200020-200029. A November
24, 1998, memorandum to Mr. Abraham Ferdas, U.S. EPA,
from Mr. Kevin Boyd, U.S. EPA, requesting additional
funding for a removal action; and a September 17,
1998, memorandum to Mr. Timothy Fields, U.S. EPA, from
Mr. Abraham Ferdas, U.S. EPA, approving a request for
an exemption to the 12-month statutory limit for a
removal action restart and the use of remaining
original funds, are attached.

4.	Special Bulletin for a Removal Action, Old Wilmington
Road Groundwater Superfund Site, 4/24/18. P. 200030-
200039.

5.	Memorandum to Mr. Paul Leonard, U.S. EPA, from Mr.
Eduardo Rovira, U.S. EPA, re: Request for Additional
Funds, Change of Scope, and Exemption From 12-Month
Statutory Limit for Removal Action, 1/30/19.

P. 200040-200047.

6.	Modification of Administrative Record, 8/28/19.

P. 200048-200064. A January 30, 2019 Memorandum to Mr.
Paul Leonard, U.S. EPA, from Mr. Eduardo Rovira, U.S.
EPA, and an Index of Documents for the 2019 update to
the Administrative Record, are attached.

8


-------
APPENDIX B

RESPONSIVENESS SUMMARY

33


-------
This Responsiveness Summary for the Interim ROD summarizes information about the views of the public
regarding both the remedial alternatives and general concerns about the Old Wilmington Road Groundwater
Superfund Site, OU-1 Proposed Plan, submitted during the public comment period.

EPA issued a public notice in the Daily Local News on September 28,2022, which contained a list of the
components of EPA's preferred alternative, information relevant to the duration of the public comment
period, the date of the public meeting, and the availability of the Proposed Plan and the AR file. The public
comment period for the Proposed Plan was from September 28, 2022 through October 28, 2022. During the
public comment period, EPA received written and oral comments. Additionally, a public meeting was held
on October 1 1, 2022, at the Wagontown Fire Company, during which time the public could provide oral
comments and ask questions in-person.

After receiving the public's questions and comments both during the public comment period and public
meeting for the Site, EPA determined that no significant changes to the proposed interim remedial action, as
originally identified in the Proposed Plan, were necessary or appropriate.

Comments Received during Public Comment Period

EPA received comments from a total of 3 residents of the local community, i.e., one comment via email
from one resident, one comment via voicemail, and a comment letter via postal mail. Additionally,
numerous comments and questions were provided orally during the public meeting on October 1 1, 2022,
which are summarized below and also documented in a meeting transcript that can be found in the AR file
for this Site, which is available to the public online at https://semspub.epa.gov/src/collection/03/AR67242.
Below are summaries of the significant comments and questions that EPA received and EPA's responses to
them.

Comment #1

Comment: EPA received several comments in support of Alternative 3.

Response: EP A thanks the commenters for their support of the Selected Remedy.

Comment #2

Comment: One resident wrote: "Our household is outside of the plume area. Are we able to
have a water connection to our house? If yes, who is going to pay for it?" A similar question
was posed during the public meeting.

Response: As presented in the Proposed Plan, EP A has delineated the extent of the VOC and
1,4-dioxane plumes and identified an "area of concern" (AOC) which includes the area above
the plumes and sources areas as well as a buffer area around the plumes. The extent of the
buffer area will be determined during the remedial design. If a property is located within the
AOC, EPA will offer the property owner a connection to the water line and EPA will pay for
the connection. If a property is outside of the AOC, EPA will not be offering to connect the
property to the water line. If conditions change or new data demonstrate that additional
properties are impacted or potentially impacted by either current Site COCs or additional
contaminants that may be determined to be Site COCs, those properties will be included in

34


-------
the AOC. Also, even if a property is not located within the AOC, the resident could still
connect to the water line at their own expense.

Comment #3

Comment: A resident wrote: "At the meeting it was mentioned that PFAS chemicals was
also in the groundwater. Why was it not listed on the map showing the extent of the PF AS
plume area? Are PFAS (forever chemicals) plume spreading?" A similar question was posed
during the public meeting.

Response: The map did not show the extent of the PF AS contamination because EPA does
not yet know the extent of the PF AS contamination in the groundwater. That investigation is
still on-going as EPA continues to gather more information. Once additional information is
gathered, it will be used to delineate the extent of PFAS contamination and whether it is
spreading.

Comment #4

Comment: A resident wrote: "It has been many years since EPA tested our well water for
toxic chemicals. Is EPA going to test our water in the future?"

Response: With respect to the volatile organic compound (VOC) and 1,4-dioxane plumes,
hydrogeological studies and years of groundwater monitoring data demonstrate that they are
stable. EPA continues to conduct groundwater monitoring at the Site. EPA anticipates that
the monitoring will continue to demonstrate that the plumes are stable. However, if future
monitoring shows that the plumes are migrating, EPA will conduct additional groundwater
sampling as necessary.

With respect to PFAS, EPA will be sampling residential well water in the future as the
investigation into PFAS for OU-1 continues and as the remedial investigation for OU-2
continues.

Comment #5

Comment: A resident asked: "Is EPA considering a cancer impact study for this Superfund
site area? If not, then why not?" At the public meeting, another resident inquired whether
cancer rates for this area were higher than for other areas.

Response EPA does not conduct cancer impact studies. Cancer studies are conducted by the
appropriate health agency. In this case the appropriate health agency is the Pennsylvania
Department of Public Health (PADOH). PADOH's Pennsylvania Cancer Registry is a
statewide data system responsible for collecting information on all new cases of cancer
diagnosed or treated in Pennsylvania. The web address is:

https://www.health.pa.gov/topics/disease/Cancer/Pages/Cancer.aspx. PADOH's Registry is
part of the National Program of Cancer Registries administered by the Centers for Disease
Control and Prevention (CDC). On a county level, out of 67 counties in Pennsylvania, 51
counties have higher cancer incidence rates than Chester County, meaning that Chester
County has one of the lower rates of cancer in Pennsylvania. More information can be found

35


-------
at: https: //statecancerprofiles. cancer, gov/incidencerates/index. php?stateFIPS=42&areatvpe=c
ount¥&cancer=001 &race=00&sex=0&age=001 &stage=999&vear=0&tvpe=incd&sortV ariab
lcNamc ratc&sortOrder dcsc&outpiit 2

Coninient #6

Comment: One commenter stated: "We are concerned because in the future the plumes will
affect our well water. Is the plume stable in size or is it spreading?

Response: As stated in response to Comment #4 above, data demonstrate that the VOC and
1,4-dioxane plumes are stable. EPA does not have any evidence suggesting that they are
spreading.

Comment #7

Comment: One resident wrote: "Also there was no Amish members of the area present at the
meeting. Were they notified? A similar question was asked during the public meeting.

Response: Yes, the Amish community members were notified. Fact sheets were mailed out
to a large area surrounding the Site, including the Amish community.

Comment #8

Comment: One resident commented in support of Alternative 2. The resident stated the
following reasons: "Our current economic crisis has caused families who are struggling to
afford the basic necessities such as food, gas for their car, or heat for their homes to add an
additional monetary burden. If families can't afford all of these basic needs, it would cause
them to choose which one not to pay. Because of this we oppose alternative 3. The second
reason we oppose alternative 3 - "is public water really safe?" Considering they put
chemicals in this water (ie: Chlorine, Fluoride, etc. these chemicals cause harm to our bodies
even at recommended EPA levels) but we the people who are receiving this public water
don't know what other contaminates [sic] are in the water but would just have to trust the
water company that they are testing the water."

Response: EPA acknowledges that there would be a monthly water bill for each resident who
connects to the public water line as part of Alternative 3. However, while there is no
obligation to connect, it would provide a permanent public water supply (with mandated
monitoring requirements) eliminating unacceptable risks resulting from the use of
contaminated residential well water and protect against new or emerging contaminants, such
as per- and polyfluoroalkyl substances (PFAS). In addition, please see EPA's response to
Comment #10. With regards to the commenter"s second reason, state and federal regulations
require routine monitoring of public water supplies and establish safe drinking water
standards which must be met by the provider. These standards are designed to protect human
health and are enforceable. Additionally, public water suppliers are required to provide
customers with Consumer Confidence Reports on an annual basis. These reports provide
customers with information about their local water quality. Finally, although there are some
costs associated with connection to a public water line, there are also costs associated with
well water including electric, pump repair and routine maintenance.

36


-------
Comment #9

Comment; There were questions during the public meeting concerning the current status of
the Site's cleanup.

Response: As stated in the ROD, EPA continues to investigate and clean up contaminated
media, including soil and groundwater, as part of Operable Unit 2 (OU-2), at the Site. The
Selected Remedy in this Interim ROD provides a permanent public water supply via a water
line that will prevent exposure to Site-related groundwater contamination in residential
drinking water wells as well as VI while EPA addresses OU-2. Once EPA collects sufficient
data and evaluates the data, EPA will identify the clean-up alternatives for OU-2 and will
proceed through the community involvement process to present EPA's preferred alternative
for remediation of Site soils and groundwater to the public. While the investigation for OU-2
continues, EPA's priority has been to ensure that the community's drinking water is safe by
first providing POETS to affected residents through removal actions and now by selecting a
permanent public water supply via a water line under Operable Unit 1 (OU-1).

Comment #10

Comment: During the public meeting, a resident asked why the homeowner has to pay the
water bill if they are connected to the water line.

Response: EP A is authorized to remediate threats arising from the release of hazardous
substances. EPA will eliminate this threat and prevent human exposure to hazardous
substances by installing a water line. This water line will serve as a clean and safe drinking
water source to homeowners. EPA does not have authority to provide funding for the actual
supply of water to individual homeowners and these costs are typically the responsibility of
the homeowner.

Comment #11

Comment: During the public meeting, there was a question as to whether EPA has
considered air sparging as an alternative remedy?

Response: Air sparging could potentially be considered under OU-2. The Proposed Plan for
OU-1 presented alternatives to prevent exposure to Site-related groundwater contamination in
residential drinking water wells as well as VI. Air sparging is a remediation technology used
to treat contaminated groundwater, the treatment of which will be addressed as part of OU-2.

Comment #12

Comment: During the public meeting, there were questions concerning groundwater flow
and frequency of monitoring well sampling.

Response: There are several underground bedrock fractures and faults that influence
groundwater flow, which is generally eastward. Based on hydrogeological studies.

37


-------
monitoring wells have been carefully placed so as to define the extent of contamination.
EPA has sampled monitoring wells at the OVV'R Site for years now and has collected enough
data to define where the VOC and 1,4-dioxane groundwater contamination is located. Given
that the plumes of VOC and 1,4-dioxane contamination are well defined, monitoring wells
are sampled less frequently than they historically have been sampled. The extent of the VOC
and 1,4-dioxane plumes is stable, and EPA does not have any evidence to suggest that the
VOC and 1,4-dioxane plumes are expanding. EPA, however, may conduct additional
sampling for VOCs and 1,4-dioxane as part of OU-2. EPA does not expect any such sampling
to show that the plumes have expanded, however, if new data demonstrate that Site COCs
have migrated, EPA will take appropriate action. EPA will conduct additional sampling for
PF AS for OU-1.

Comment #13

Comment: During the public meeting, there were questions concerning how monitoring is
conducted for vapor intrusion.

Response: Vapor intrusion occurs when there is a migration of vapor-forming chemicals
from any subsurface source into an overlying building. The vapor-forming chemicals of
concern at this Site are VOCs. These vapors are monitored for by taking vapor samples from
the soil under the home's foundation; these are called slab, or sub-slab samples. EPA does
not generally recommend indoor air sampling before slab or sub-slab sampling, because
indoor air quality varies widely day to day. Also, household products may interfere with
sampling results. Indoor air samples are generally collected from the lowest-level space in a
building, typically a basement, during the heating season. If a building does not have a
basement, indoor air samples may be collected from the first floor. Sub-slab vapor and
outdoor air samples are usually collected at the same time as indoor air samples to help
determine where VOCs may be coming from (indoor sources, outdoor sources, and/or
beneath the building). For more information on vapor intrusion, see
https://www.epa.gov/vaporintrusion.

Comment #14

Comment: During the public meeting, a resident inquired about whether there were maps of
the vapor intrusion monitoring.

Response: EPA conducted a vapor intrusion investigation at this Site and does indeed have
maps with residential results. The individual residences that were sampled for VI were
provided with the results. Addresses of those sampled are not made available to the general
public due to privacy concerns for the individual property owners and, consequently,
residential monitoring results are not made available to the general public either. As part of
the Selected Remedy, additional vapor intrusion sampling may be conducted in the future.

Comment #15

Comment: During the public meeting, a resident inquired if a permit would be issued to
allow for a new residential well to be drilled in the area for a new house.

38


-------
Response: Chester County is responsible for issuing permits for residential wells. Chapter
500, Section 501, of the Chester County Health Department Rules and Regulations outlines
the requirements and restrictions for issuing such permits. Additionally, as part of the
Selected Remedy, ICs will be implemented to restrict potable use of untreated groundwater
within the contaminated plumes along with a prohibition on the installation of any new
groundwater wells within the lateral extent of the plumes until remediation standards and
protectiveness have been achieved, unless EPA, in consultation with PADEP, gives prior
written approval for such installation.

Comment #16

Comment: During the public meeting, a question was raised as to why we don't go after the
responsible parties.

Response: EPA does investigate potentially responsible parties and that process is still on-
going for this Site.

Comment #17

Comment: Have you informed the community about two other Superfund Sites that are

nearby?

Response: William Dick Lagoons (see www.epa.gov/superfund/williamdicklagoons) and
Blosenski Landfill (see www.epa.gov/superfund blosenski) are two separate Superfund Sites
that are also located in West Cain Township. They are separate and distinct sites from the Old
Wilmington Road Groundwater Superfund Site with their own remedies and community
outreach efforts. Outreach efforts to the surrounding communities of these sites is ongoing.

Comment #18

Comment: During the public meeting, a question was raised as to how the remedy selection
process works.

Response: EPA issues a Proposed Remedial Action Plan (proposed plan) which describes
the remedy alternatives discussed in the Feasibility Study for the site and presents EPA's
preferred alternative. The Remedial Project Manager, in this case Irene Shandruk, developed
the Proposed Plan in consultation with EPA technical support and legal teams for the Site.
The Plan was also reviewed by the Office of Land and Emergency Management at EPA
Headquarters. EPA's support agency for this Site, PADEP, is involved with all aspects of this
process and provides input on how EPA proceeds. PADEP reviewed and provided comments
on the Proposed Plan prior to final review and approval at EPA. The final review and the
approval to issue the Proposed Plan was at the regional level with the Director of the
Superfund and Emergency Management Division. Then the proposed plan is made publicly
available, along with the AR file for the site, and EPA solicits feedback from the public on
the preferred alternative. There is typically a 30-day public comment period during which
time the public can submit their comments, questions, and concerns on the proposed plan.
EPA also typically holds a public meeting where the plan is formally presented to the
community and a Q& A session is held. Taking all of the public comments into

39


-------
consideration, EPA then selects the remedy in a Record of Decision.

Comment #19

Comment: Questions were raised at the public meeting regarding EPA's definition of "a
site" and what are the Site's boundaries0

Response: The Site boundaries are defined by where Site-related hazardous substances were
deposited, stored, disposed of, or placed, or otherwise came to be located. Before EPA had
gathered enough data to characterize the nature and extent of contamination, roads and
natural landmarks were used to describe the approximate boundaries of the Site. In various
Site documents, boundary descriptions are conservative and may have been described as
being West Mattson Hollow Road to the southeast. Old Mill Road to the southwest, property
owned by the Natural Lands Trust to the west, and Airport Road to the north and northeast.
Given that the VOC and 1,4-dioxane plumes are now well defined, the boundaries for what is
considered "the Site" have been redefined to extend over the source areas and groundwater
contaminant plumes. Additionally, as investigation into emerging contaminants continues,
the Site boundaries may be redefined again in response to new data.

Comment #20

Comment: During the public meeting, a resident stated: "What I don't understand is that
you're saying it's in the groundwater. That whole area is on a hill. Groundwater water flows
downhill. How can you say the other areas on the bottom of that hill are not affected? We
flood constantly. The ground is very wet at the bottom of that hill. I mean, I live in the
swamp. So how can you say that it's not affected?" This was followed by discussion of
groundwater flow and placement of monitoring wells.

Response: Surface water flows downhill. Groundwater is underground, and its flow is
influenced by fractures and faults in the bedrock. For this Site, there is a network of complex
fractures and faults in the bedrock which cause the flow of groundwater to generally be
eastward. Flow of surface waters that may be impacting areas downgradient are not related to
the flow of groundwater beneath the surface. Placement of monitoring wells is determined by
groundwater flow because the direction of the groundwater flow is the direction in which the
contamination is flowing. The wells have been placed around the perimeter of the
groundwater contaminant plumes.

Comment #21

Comment: During the public meeting, a resident asked: "Let's say you were a homeowner
and you had a couple of acres of ground and you wanted to subdivide and build a house on it,
would the Health Department give you a permit to drill a well right now in that area?"

Response: EP A does not issue permits for wells and is unable to speak on behalf of the
Chester County Health Department (CCHD). CCHD requirements for water supply wells in
an area of concern are provided in Section 501.15 of the CCHD Rules and Regulations. In
addition, ICs are a component of the Selected Remedy, and one specific IC prohibits the
installation of any new groundwater wells until remediation standards and protectiveness

40


-------
have been achieved, unless EPA, in consultation with PADEP, gives prior written approval
for such installation.

Comment #22

Comment: During the public comment period, a resident asked: "When will all of this start?
How long will it take to finish?"

Response: EP A estimates that the construction of the water line will begin two to three years
from issuance of this Interim ROD. As stated in response to comment #18 above, the ROD is
the document in which EPA selects the remedy for a Site, after the requisite public comment
period. After the Interim ROD is issued, EPA will begin the design phase, during which the
Interim Remedy's design details are developed. Finally, EPA develops a plan for actual
construction of the selected interim remedy. During construction, EPA-installed treatment
systems will continue to be maintained and monitored. Once construction is completed, EPA
will no longer maintain or monitor those treatment systems. It is estimated that actual
construction of the water line will take two to three months, followed by an additional couple
of months of restoration work on roads and residents" properties.

Comment #23

Comment: During the public meeting, one resident inquired whether there is a "geotech
report" for the Site that will confirm the location of all the rock.

Response: EPA maintains an AR file for this Site with all the supporting
documentation for its selected remedy. The AR file contains a Remedial Investigation
report and a Supplemental Remedial Investigation report that discusses the Site's
geology and hydrogeology, which includes data concerning below surface geologic
features such as bedrock. The AR file for this Site can be accessed via the internet at
www.epa.gov/superfund/oldwilmingtonroad.

Comment #24

Comment: During the public meeting, one resident commented on the contamination
remaining in the groundwater and whether any action can be taken on it.

Response: Remediation of the groundwater is possible and such remediation will be
addressed as part of OU-2. EPA had planned to propose alternatives for remediation of
the groundwater until emerging contaminants, specifically per- and polyfluoroalkyl
substances (PFAS), were discovered. This resulted in EPA taking this interim remedial
action and initiating a new investigation to delineate the nature and extent of the PF AS
along with the remaining contaminated media at the Site

Comment #25

Comment: During the public meeting, one resident asked if these contaminants can
pass into farm animals that people consume.

41


-------
Response: No, VOCs such as tetrachloroethene (PCE) and trichloroethene (TCE) and
SVOCs such as 1,4-dioxane are highly unlikely to pass into farm animals used for
consumption at current concentrations. For more information on PCE, see
https://wwwn.cdc.gov/TSP/substances/ToxSubstance.aspx?toxid=48For more
information on TCE, see

https://wwwn.cdc. gov/TSP/substances/ToxSubstance.aspx?toxid=30. For more
information on 1,4-dioxane, see. With regards to PFAS, the risk assessment community
and the health community, in general, are still learning about its effects on livestock
and food products. For more information on PFAS, see https://www.epa.gov/pfas/pfas-
explained.

Comment #26

Comment: During the public meeting, one resident asked: "This plume is uphill from the
Coatesville Reservoir which is only 2.5 to 3 miles away. Is that a

concern?"

Response: No, this is not a concern. We have monitoring well data bounding the
extent of the plumes, and the extent of the plumes is not near the Coatesville Reservoir.
See the Supplemental Remedial Investigation for more information. It can be accessed
via the internet at www.epa.gov/superfund/oldwilmingtonroad.

Comment #27

Comment: During the public meeting, some concerns were raised with regards to the
waterline, such as length of time for construction and a boil water advisory issued in the
recent past.

Response: As stated in response to comment #22 above, EPA estimates that the water line
will be installed in two to three years after the issuance of this Interim ROD. During
construction, EPA-installed treatment systems will continue to be maintained and monitored.
With regards to the boil water advisory, each entity supplying public water is required to
follow the public notification requirements regulated by PADEP and EP A if there is any
event where drinking water could become contaminated. But if this occurs, required
precautions and safety measures are triggered, which includes boil water advisories until safe
drinking water has been restored. See

https://www.dep.pa. gov/OurCommonWealth/pages/Article. aspx?post=8

42


-------
APPENDIX C
ARARs and TBCs FOR SELECTED REMEDY

43


-------
Table C-l: Chemical-Specific ARARs

Requirement
Maximum Contaminant Levels
(MCLs) promulgated under the Safe
Drinking Water Act of 1974, as
amended, 42 U.S.C. §§ 300f et seq.
(SDWA)

Citation

40 C.F.R. §§141.61 and
141.62

Status

Relevant and
appropriate

Pennsylvania Statewide Health
Standards promulgated under the
Land Recycling and Environmental
Remediation Standards Act of May
19, 1995, P.L. 4, No. 2, 35P.S. §§
6026.101 et seq. (Act 2)

25 Pa. Code §§

250.304, and Appendix B,
Tables 1 and 2

Relevant and
Appropriate

Description

Establishes maximum
contaminant levels
(MCLs) for certain organic
and inorganic
contaminants, which are
enforceable standards for
public water supply systems
having at least 15 service
connections or being used
by at least 25 persons.

Statewide Health Standards
are Medium- Specific
Concentrations (MSCs) of
regulated substances
associated with groundwater,
used for cleanups under PA
law.

Relation to Remedy

Groundwater in the area of
concern is an underground source
of drinking water. MCLs are
relevant and appropriate as in situ
cleanup standards for
groundwater that is or may be
used for drinking water. EPA is
not selecting a remedy to clean-up
groundwater on the Site with this
action, however, PA American
Water, an off-site public water
system, is still required to meet
all applicable Safe Drinking
Water Act requirements,
including treatment of drinking
water to MCL standards. While
MCLs are not ARARs for such
off-Site treatment, they are
chemical-specific ARARs for the
purpose of determining the scope
of the AOC (i.e., which residents
will be offered connection to the
newly constructed waterline.
The MSCs for COCs in drinking
water are relevant and appropriate
standards when there are no
MCLs. While MSCs are not
ARARs for such off-Site
treatment, they are chemical-
specific ARARs for the purpose
of determining the scope of the
AOC (i.e., which residents will be
offered connection to the newly
constructed waterline.

Requirement

Regulations promulgated
under Section 106 of the
National Historical

Citation

36 C.F.R. Part 800

Table C-2: Location-Specific ARARs
Status	Description

Applicable	: Section 106 of the NHPA requires any

Federal undertaking to consider the
! effect the activity may have on any
44

Relation to Remedy

The water line construction meets the
definition of an "undertaking" under
36 C.F.R. § 800.16(y). Accordingly,


-------
Preservation Act of 1966, as
amended (NHPA), 54 U.S.C.
§ 306108

Regulations under the	: 16 U.S.C. § 703 and Applicable

Migratory Bird Treaty Act of	: 50 C.F.R. § 10.13

1918, as amended

("MBTA"), 16 U.S.C. § 703	:

Consultation requirements 50 C.F.R. §§ 402.01- Applicable

under Section 7 of the	402.17

Endangered Species Act of

1973, as amended ("ESA"),

16U.S.C. § 1536

PA regulations promulgated 17 Pa. Code § 45.12 : Applicable
under the Wild Resource ; and 45.31
Conservation Act, Act of

historic property, and the Federal
Advisory Council on Historic
Preservation must be given a
reasonable opportunity to comment on
the undertaking.

The regulations at 36 C.F.R. Part 800
describe the actions a Federal agency
must take to meet its statutory
responsibilities under the NHPA,
including consultation with the
Pennsylvania State Historic
Preservation Office (SHPO) and the
Federal Advisory Council on Historic
Preservation to determine if the
Federal undertaking will affect
cultural or historic sites on or eligible
for the National Register of Historic
Places.

Section 703 of the MBTA prohibits
the take (including killing, capturing,
selling, trading, and transport) of
protected migratory bird species that
are native to the United States without
prior authorization by the U.S. Fish
and Wildlife Service ("FWS"). The
species protected as migratory birds
under the MBTA are listed at 50
C.F.R. § 10.13.

The ESA requires consultation
between the U.S. Fish and Wildlife
Service ("FWS") and other Federal
agencies to ensure that any agency
action authorized, funded, or carried
out by these agencies is not likely to
jeopardize the continued existence of
any endangered or threatened species
or result in the destruction or adverse
modification of habitat of such
species.

Provides for general restrictions
regarding threatened or endangered
plant species.

45

EPA will comply with Section 106 of
the NHPA and the regulations
implementing it. EPA will consult
with the Federal Advisory Council
and SHPO prior to the remedial
action.

Appropriate actions will be taken
during the water line construction to
ensure that no on-Site migratory birds,
listed at 50 C.F.R. § 10.13, or their
nests are adversely affected.

There is potential presence of
threatened species in the surface
waters of this part of Chester County,
PA. Consultation will occur with FWS
to ensure the water line construction
does not jeopardize the continued
existence of any endangered or
threatened species or result in the
destruction or adverse modification of
habitat of these species.

There is potential presence of
endangered plant species in Chester
County, PA. The water line
construction will comply with the


-------
June 23, 1982, P.L. 597, No.
170, 32P.S. §§ 5301 etseq.

substantive requirements of these
restrictions, as necessary.

Requirement

West Cain Township
Ordinance #13

Chester County Health
Department Rules and
Regulations - Chapter 500
(Water Wells, Nuisances,
Sewage and Liquid Waste),
§501 (Water Well
Construction, Monitoring
Wells, And Individual, Semi-
Public and Public Water
Supplies and Geothermal
Boreholes).

Stormwater regulations
promulgated under the CWA,
33 U.S.C. §§ 1251 et seq.

Table C-3: Action-Specific ARARs and TBCs
Citation	: Status	Description

Section 8	TBC	Sets forth requirements for

http://www.westcaln.org/files/1 :	water supply to mobile home

31149345.pdf	.	; parks.

Available at

https://www.chesco,ore/D
ocumentCenter/View/429/
501?bidld=

§§ 501.16.1; 501.16.2;
501.16.4; 501.16.5; 501.17

TBC

40 C.F.R. § 122.26(c)( 1 )(ii)

Relevant and
Appropriate

Sets forth requirements for
well permit applications,
decommissioning of wells,
and water source replacement
in Chester County, PA.

This regulation requires the
operator of a new stormwater
discharge associated with
small construction activity, as
defined by 40 C.F.R. §
122.26(b)(15), to maintain
certain information about the
nature of the site, the nature
of on-site activities, proposed
best management practices to
control pollutants in
stormwater during and after
construction activities, an

Relation to Remedy

This substantive, non-administrative
requirements for replacing the
common residential supply well at
the mobile home park located at
Donovan Drive will be considered in
connection with installation of
proposed water line.

The substantive, non-
administrative provisions of
Chapter 500, Section 501, of the
CCHD Rules and Regulations will
be considered for replacing
residential wells with a public
water line, the decommissioning of
residential wells and the retention
of residential wells upon
connection to public water for the
on-Site part of the remedial action.
No permits, licenses or similar
administrative requirements will be
obtained.

Best management practices to
control COCs in stormwater during
the construction of the water line
will be implemented. Information
required to be maintained under
this regulation will be reported to
appropriate PA and Federal officials.
No permit will be obtained3.

See 42 U.S.C. § 9621(e) and 40 C.F.R. § 300.400(e) (No Federal, state, or local permit is required for the on-site portion of a response action conducted under
Section 104 of CERCLA. The term on-site means the a real extent of contamination and all suitable areas in very close proximity to the contamination necessary for
implementation of the response action.)

46


-------
Standards applicable to
generators of hazardous waste
under RCRA

PA criteria for identification of
hazardous waste, promulgated
under the SWMA

PA standards applicable to
generators of hazardous
waste, promulgated under the
SWMA

40 C.F.R. §§ 262.16;
262.18(a)-(c); 262.20-

Applicable

262

262..

27;

oin/4

aiim

25 Pa. Code §§
261a. 1, 261a.2,
261.a.3 (b), 261.a.7

Applicable

25 Pa. Code §§
262a.14(a), 262a.16,
262a.18, 262a.21
265a Subchapter I4

app:

estimate of the runoff
coefficient of the site, and the
name(s) of the receiving
water(s).

These regulations
establish standards for
generators of hazardous
waste, as defined by 40
C.F.R. § 261.3.

Criteria for identification
and management of
hazardous waste. These
criteria incorporate Federal
regulations at 40 C.F.R.

Part 261, except as
expressly provided.

These standards are
substantive requirements
for persons who generate a
hazardous waste, as
defined by 25 Pa. Code §
261a.3(b).

Any generation of a hazardous
waste (POET filters) in the area of
concern, as defined by 40 C.F.R. §
261.3, during the remedial action
will comply, as appropriate, with the
substantive parts of these standards.
During the remedial action, sampling
of waste (POETS soil / waste
excavated during water line
construction, and other wastes
generated) will be conducted to
ensure proper classification and on-
site handling of solid wastes
generated.

Any generation of a hazardous
waste in the area of concern, as
defined by 25 Pa. Code § 261a.3(b),
during the remedial action will
comply with the substantive
standards related to the action.

PA regulations concerning
residual waste management,
promulgated under the PA
SWMA

PA requirements for erosion
and sediment control
promulgated under the Clean
Streams Law

25 Pa. Code §§ 287.54(a)(1)-
(2), (c), and (d); 299.111;
299.112(a)-(c); 299.114(a)
and (b); 299.115(a)-(b);
299.116; 299.121(a), (b), (d),
and (e); and 299.131(b)
25 Pa. Code §§ 102.2;
102.4(b)(l)-(5); 102.8(b)-(f)
and (n); 102.11(a) and (b);
102.22

Applicable

Applicable

These regulations set
forth the requirements
for persons who
generate, manage, or
handle residual waste

These regulations
require persons
conducting earth-
disturbance activities to
develop, implement, and
maintain best
management plans
("BMPs") to minimize the

During the remedial action, sampling
for residual waste will be conducted
to ensure proper classification and
onsite handling for possible residual
waste during the implementation of
remedial action.

An erosion and sediment-control
plan will be developed and
implemented to minimize erosion
and sedimentation to Rock Run or
other streams during the
construction of the water line. No
permit or administrative approval
will be obtained.

4 25 Pa. Code § 262a.10 incorporates by reference 40 C.F.R. Part 262, except as expressly provided in 25 Pa. Code Chapter 262a.

47


-------
PA Standards for
Contaminants, Chapter
123 promulgated under the Air
Pollution Control Act, Act of
Jan 8, (1960) 1959, PL. 2119,
No. 787, as amended, 35 P.S.
§§ 4001 et seq. (ACPA)

Safe Drinking Water
Regulations, Chapter 109

25 Pa. Code §123.1(c); 123.2 Applicable

Public Water Supply Manual,
Part II, Community System
Design Standards, May 6, 2006

25 PA Code Chapter 109, ; Applicable

Subchapter F. (Design and

Construction Standards), §§

109.601, 109.602 (a)(1) and

(2), 109.607, 109. 608, and

109.609(a)

Document Number:	TBC

383-2125-108

Erosion and Sediment Pollution
Control Program Manual,
March 2012

Document Number:	TBC

363-2134-008

PA Stormwater Best
Management Practices
Manual, December 30, 2006

Document Number:

363-0300-002

TBC

potential for accelerated
erosion and
sedimentation and to
manage post-
construction
stormwater.

Sets forth requirements
for fugitive emissions;
establishes

specific limitations for
particulate matter, odor,
and visible emissions.

Fugitive dust emissions generated
during the construction of the water
line that involves excavation will be
controlled No permit will be
obtained but all substantive
requirements of a permit will be
met.

Only those substantive portions
relevant to design and construction
of proposed water line and/or
laterals will be used, as appropriate.

Provides detailed design
and construction standards
for all community water
supplies.

Provides guidance and
procedures on ways to
minimize accelerated
erosion and resulting
sediment pollution to
surface waters.

Ensures effective
stormwater management
to minimize the adverse
impacts of stormwater on
groundwater and surface
water resources.

Only those substantive portions
relevant to design and construction
of proposed water line and/or
laterals will be considered as
performance standards to be met,
as appropriate.

The manual will be considered, as
appropriate, for minimizing erosion
and sedimentation to Rock Run or
other streams during the
construction of the water line.

The manual will be considered, as
appropriate, for best management
practices to control stormwater
during the construction of the water
line. No permit will be obtained.

48


-------
APPENDIX D

PERFORMANCE STANDARDS FOR RESIDENTIAL WELL WATER

49


-------
PERFORMANCE STANDARDS FOR RESIDENTIAL WELL WATER

OLD WILMINGTON

ROAD SIT]

E, WEST CALI

V TOWNSHIP, CI

HESTER COUNTY, PENNSYLVANIA

Chemical of

Concern

PADEP ACT
2

Groundwater
MSCs (2)
(fig/L)

SDWA
MCLs (1)
(fig/L)

EPA
RSLs'3'
Resident
Tapwater

(fig/L)

Exposure Point
Concentration
(EPC)
(fig/L)

Range of
Background
Cone.
(fig/L)

Performance
Standard
(fig/L)

Rationale for

Performance
Standard

Residential

T etrachloroethene

5

5

20.5

65.7

ND

5

Federal SDWA MCL

Trichloroethene

5

5

1.4

10.6

ND

5

Federal SDWA MCL

1.4-Dioxane

6.4

NA

4.6

3.84

ND

6.4

PADEP MSC

2-Hexanone

NA

NA

19

41

ND

19

EPA RSL

Bis(2-

ethylhexyl Iphthalatc

6

NA

56

11

ND

6

PADEP MSC

Caprolactam

NA

NA

4,950

2800

ND

4,950

EPA RSL

Aluminum

NA

NA

10,000

57,655

103- 139

10,000

EPA RSL

Arsenic

10

10

0.52

12.8

0.46 J

10

Federal SDWA MCL

Cobalt

10

NA

3

63.9

5.6-6.6

10

PADEP MSC

Iron

NA

NA

7,000

45,400

14.5 J-21.6 J

7,000

EPA RSL

Lead

5

15

7.5

23.1

0.2 J

5

PADEP MSC

Manganese

300

NA

215

2,525

243 - 308

300

PADEP MSC

Thallium

2

2

0.1

0.539

ND

2

Federal SDWA MCL

Notes:

1.	Safe Drinking Water Act (SDWA) maximum contaminant levels (MCLs) regulate organic and inorganic constituents in public drinking water supplies (EPA 816-F-09-004).
May 2009.

2.	PADEP ACT 2 = Pennsylvania Department of Environmental Protection Statewide Health Standards Medium-Specific Concentrations (MSCs) for Groundwater
(11/20/21): https://www.dep.pa.gov/Busmess/Land/LandRecvcling/Standards-Guidance-Procedures/Pages/Statewide-Health-Standards.aspx.

3.	EPA Regional Screening Levels (RSLs) for Resident Tap water Table (TR=lE-05, HQ=0.5), May 2022. https://semspiib.epa.aov/work/HO/4Q2389.pdf

4.	Exposure Point Concentration (EPC) is the concentration of contaminant to represent the level of reasonable maximum exposure anticipated for that medium.

5.	EPA RSLs are non-mandatory water quality standards.

6.	Abbreviations: J = estimated concentration; ND = not detected; NA = not available; (ig/L = microgram per liter

50


-------
APPENDIX E

CLEANUP LEVELS FOR VAPOR INTRUSION

51


-------
CLEANUP LEVELS FOR VAPOR INTRUSION
OLD WILMINGTON ROAD SITE, WEST CALN TOWNSHIP, CHESTER COUNTY, PENNSYLVANIA

coc

EPA

RSLs/VISLs for Resident1 (|ig / m3)

PADEP
Statewide Health Standard for
Resident2 (|ig / m3)

Residential Cleanup
Level ((ig / in3)

Indoor Air
RSL TR =
1E-5 HQ=1

Subslab Vapor
VISL TR =
1E-5 HQ=1
AF=0.03

Indoor
Air

Screening
Values

Sub-Slab Soil Gas
Screening V allies

Indoor Air

Subslab Vapor

TCE

2.1

70

2.1

80

2.1

70

PCE

42

1,390

42

1,600

42

1,390

Chloroform

1.2

41

1.1

41

1.1

41

Vinyl chloride

1.7

56

0.81

31

0.81

31

Notes:

1.	EPA Regional Screening Level (RSL) Resident Ambient Air and Composite Worker Ambient Air Tables (TR=lE-5, HQ=1), November 2021,
(https://semspub.epa.gov/work/HQ/401655.pdf); VISLs derived using EPA Vapor Intrusion Screening Level Calculator (https://www.epa
.gov/vaporintrusion/vapor-intrusion-screening-level-calculator).

2.	PADEP Land Recycling Program Technical Guidance Manual for Vapor Intrusion into Buildings from Groundwater and Soil under Act 2. Document
number: 261-0300-101. Vapor Intrusion Screening Value Tables, November 20,2021. PADEP= Pennsylvania Department of Environmental
Protection.

3.	EPA RSLs, VISL, and PADEP soil gas and indoor air screening values are non-mandatory standards.

52


-------
APPENDIX F
RAGS PART D TABLES

53


-------
RAGS Part D Table 1
Selection of Exposure Pathways


-------
TABLE 1

SELECTION OF EXPOSURE PATHWAYS
OLD WILMINGTON ROAD SITE

PAGE 1 OF 2

Scenario
Timeframe

Medium

Exposure
Medium

Exposure
Point

Receptor
Population

Receptor
Age

Exposure
Route

Type of

Analysis

Rationale for Selection or Exclusion
of Exposure Pathway

Current

Surface Soil

Surface Soil

Old Wilmington Road

Industrial
Workers

Adult

Ingestion
Dermal

Quant
Quant

Industrial workers may have contact with surface soil while at the site.

Residents

Child

Ingestion
Dermal

Quant
Quant

Current residents may be exposed to surface soil during outdoor activities.

Adult

Ingestion
Dermal

Quant
Quant

Air

Old Wilmington Road

Industrial
Workers

Adult

Inhalation

Quant

Industrial workers may be exposed to fugitive dust and volatile emissions from surface soil
during work activities.

Residents

Child

Inhalation

Quant

Current residents may be exposed to fugitive dust and volatile emissions from surface soil
during outdoor activities.

Adult

Inhalation

Quant

Groundwater

Groundwater

Old Wilmington Road

Industrial
Workers

Adult

Ingestion
Dermal

None
None

Current industrial workers are not exposed to groundwater.

Residents

Child

Ingestion
Dermal

None
None

Currently there is no complete pathway. Residents with impacted wells have treatment
systems.

Adult

Ingestion
Dermal

None
None

Air

Old Wilmington Road

Industrial
Workers

Adult

Inhalation

None

Current industrial workers are not exposed to groundwater.

Residents

Child

Inhalation

None

Currently there is no complete pathway. Residents with impacted wells have treatment
systems.

Adult

Inhalation

None

Vapor Intrusion

Industrial
Workers

Adult

Inhalation

Quant

Industrial workers may be exposed to COPCs that have migrated from groundwater through
building foundations and into indoor air.

Residents

Child

Inhalation

Quant

Residents may be exposed to COPCs that have migrated from groundwater through building
foundations and into indoor air.

Adult

Inhalation

Quant

Surface Water

Surface Water

Old Wilmington Road

Residents

Child

Ingestion
Dermal

None
None

No COPCs were identified for surface water.

Adult

Ingestion
Dermal

Quant
Quant

Sediment

Sediment

Old Wilmington Road

Residents

Child

Ingestion
Dermal

Quant
Quant

Residents may be exposed to sediment impacted by COPCs from the site.

Adult

Ingestion
Dermal

Quant
Quant

Future

Surface/
Subsurface Soil

Surface/
Subsurface Soil

Old Wilmington Road

Construction
Workers

Adult

Ingestion
Dermal

Quant
Quant

Construction workers may be exposed to surface soil and subsurface soil during excavation
activities.

Industrial
Workers

Adult

Ingestion
Dermal

Quant
Quant

Industrial workers may have contact with surface soil.

Residents

Child

Ingestion
Dermal

Quant
Quant

Future residents may be exposed to subsurface soil that was mixed with surface soil during
construction activities.

Adult

Ingestion
Dermal

Quant
Quant


-------
TABLE 1

SELECTION OF EXPOSURE PATHWAYS
OLD WILMINGTON ROAD SITE
PAGE 2 OF 2

Scenario
Timeframe

Medium

Exposure
Medium

Exposure
Point

Receptor
Population

Receptor
Age

Exposure
Route

Type of

Analyses

Rationale for Selection or Exclusion
of Exposure Pathway

Future

Surface/
Subsurface Soil

Air

Old Wilmington Road

Construction
Workers

Adult

Inhalation

Quant

Construction workers may be exposed to fugitive dust and volatile emissions from surface and
subsurface soil.

Industrial
Workers

Adult

Inhalation

Quant

Industrial workers may be exposed to fugitive dust and volatile emissions from surface soil
during work activities.

Residents

Child

Inhalation

Quant

Future residents may be exposed to fugitive dust and volatile emissions from surface and
subsurface soil that was mixed during construction activities.

Adult

Inhalation

Quant

Groundwater

Groundwater

Old Wilmington Road

Construction
Workers

Adult

Ingestion
Dermal

Quant
Quant

Construction workers may have contact with groundwater during excavation activities.

Industrial
Workers

Adult

Ingestion
Dermal

Quant
Quant

Industrial workers may have contact with groundwater if groundwater is used as a drinking
water supply.

Residents

Child

Ingestion
Dermal

Quant
Quant

Residents may have contact with groundwater if groundwater is used as a drinking water
supply.

Adult

Ingestion
Dermal

Quant
Quant

Air

Old Wilmington Road

Construction
Workers

Adult

Inhalation

Quant

Construction workers may be exposed to COPCs that have volatilized from groundwater during
excavation activities.

Industrial
Workers

Adult

Inhalation

Quant

Industrial workers may be expected to be exposed to COPCs that have volatilized from
groundwater while showering.

Residents

Child

Inhalation

None

Child residents are not expected to be exposed to COPCs that have volatilized from
groundwater.

Adult

Inhalation

Quant

Adult residents may be expected to be exposed to COPCs that have volatilized from
groundwater while showering.

Vapor Intrusion

Industrial
Workers

Adult

Inhalation

Quant

Industrial workers may be exposed to COPCs that have migrated from groundwater through
building foundations and into indoor air.

Residents

Child

Inhalation

Quant

Residents may be exposed to COPCs that have migrated from groundwater through building
foundations and into indoor air.

Adult

Inhalation

Quant

Surface Water

Surface Water

Old Wilmington Road

Residents

Child

Ingestion
Dermal

Quant
Quant

No COPCs were identified for surface water.

Adult

Ingestion
Dermal

Quant
Quant

Sediment

Sediment

Old Wilmington Road

Residents

Child

Ingestion
Dermal

Quant
Quant

Residents may be exposed to sediment impacted by COPCs from the site.

Adult

Ingestion
Dermal

Quant
Quant

Definitions:

COPC = Chemical of potential concern.
Quant = Quantitative.


-------
RAGS Part D Table 2

Occurrence, Distribution and Selection
Of Chemicals of Potential Concern


-------
LIST OF TABLES
RAGS PART D TABLE 2
OCCURRENCE, DISTRIBUTION AND SELECTION OF CHEMICALS OF POTENTIAL CONCERN

Table No.



2.1

Surface Soil - Direct Contact

2.2

Surface Soil - Migration from Soil to Groundwater

2.3

Surface/Subsurface Soil - Direct Contact

2.4

Surface/Subsurface Soil - Migration from Soil to Groundwater

2.5

Gorundwater - Direct Contact

2.6

Groundwater - Vapor Intrusion

2.7

Surface Water

2.8

Sediment


-------
Scenario Timeframe: Current/Future

Medium: Surface Soil

Exposure Medium: Surface Soii	

TABLE 2.1

OCCURRENCE, DISTRIBUTION, AND SELECTION OF CHEMICALS OF POTENTIAL CONCERN - DIRECT CONTACT WITH SURFACE SOIL

OLD WILMINGTON ROAD SITE
PAGE 1 OF 2

CAS
Number

Chemical

Minimum
Concentration'1'

Maximum
Concentration'1'

Units

Sample of Maximum
Concentration

Freguency
of

Detection

Range of
Detection
Limits'2'

Concentration
Used for
Screening'3'

Range of
Background
Concentrations'4'

USEPA RSL
Residential Soilp'

Potential
ARAR/TBC

Potential
ARAR/TBC
Source

COPC
Flag

Rationale for
Contaminant
Deletion or
Selection'5'

Volatile Organic Compounds |

78-93-3

2-Butanone

26

43

ug/kg

OWR-SS-AR19-00.5-601

2/73

o
o

43

ND

2,700,000 N

NA

NA

No

BSL

67-64-1

Acetone

2

930

ug/kg

OWR-SS-AR19-00.5-601

12/73

4- 10

930

10

6,100,000 N

NA

NA

No

BSL

79-20-9

Methyl Acetate

6

7

ug/kg

OWR-SS-AR 10-00.5-601

2/73

o
o

7

ND

7,800,000 N

NA

NA

No

BSL

75-09-2

Methylene Chloride

9

39

ug/kg

OWR-SS-AR16-00.5-601,
OWR-SS-BP01-00.5-601

73/73



39

10-30

35,000 N

NA

NA

No

BSL

127-18-4

Tetrachloroethene

2

2

ug/kg

OWR-SS-JK08-00.5-601,
OWR-SS-JK98-00.5-601

1/73

o
o

2

ND

8,100 N

NA

NA

No

BSL

Semi volatile Organic Compounds |

91-57-6

2-Methylnaphthalene

9,200

9,200

ug/kg

OWR-SS-LF08-00.5-601

1/19

330- 330

9,200

ND

24,000 N

NA

NA

No

BSL

83-32-9

Acenaphthene

520

520

ug/kg

OWR-SS-LF08-00.5-601

1/19

330- 330

520

ND

360,000 N

NA

NA

No

BSL

120-12-7

Anthracene

400

400

ug/kg

OWR-SS-LF08-00.5-601

1/19

330- 330

400

ND

1,800,000 N

NA

NA

No

BSL

100-52-7

Benzaldehyde

71

71

ug/kg

OWR-SS-TY06-00.5-601

1/19

330- 330

71

ND

170,000 C

NA

NA

No

BSL

56-55-3

Benzo(a)anthracene

57

930

ug/kg

OWR-SS-LF08-00.5-601

5/19

330- 330

930

ND

1,100 C

NA

NA

No

BSL

50-32-8

Benzo(a)pyrene

68

820

ug/kg

OWR-SS-LF08-00.5-601

5/19

330- 330

820

ND

110 c

NA

NA

Yes

ASL

205-99-2

Benzo(b)fluoranthene

90

820

ug/kg

OWR-SS-LF08-00.5-601

5/19

330- 330

820

47

1,100 c

NA

NA

No

BSL

191-24-2

Benzo(g,h,i)perylene

47

110

ug/kg

OWR-SS-JK98-00.5-601

2/19

330- 330

110

ND

180,000 N(7)

NA

NA

No

BSL

207-08-9

Benzo(k)fluoranthene

69

600

ug/kg

OWR-SS-LF08-00.5-601

5/19

330- 330

600

ND

11,000 c

NA

NA

No

BSL

85-68-7

Benzyl Butyl Phthalate

57

340

ug/kg

OWR-SS-TP04-00.5-601

3/19

330- 330

340

200

290,000 C

NA

NA

No

BSL

92-52-4

Biphenyl (Diphenyl)

1,200

1,200

ug/kg

OWR-SS-LF08-00.5-601

1/19

330- 330

1,200

ND

4,700 N

NA

NA

No

BSL

117-81-7

Bis(2-Ethylhexyl) Phthalate

45

1,100

ug/kg

OWR-SS-LF08-00.5-601

17/19

330- 330

1,100

75 - 690

39,000 C

NA

NA

No

BSL

218-01-9

Chrysene

100

1,200

ug/kg

OWR-SS-LF08-00.5-601

5/19

330- 330

1,200

52 - 320

110,000 C

NA

NA

No

BSL

132-64-9

Dibenzofuran

510

510

ug/kg

OWR-SS-LF08-00.5-601

1/19

330- 330

510

ND

7,300 N

NA

NA

No

BSL

84-74-2

di-n-Butyl Phthalate

43

590

ug/kg

OWR-SS-TP02-00.5-601

3/19

330- 330

590

56

630,000 N

NA

NA

No

BSL

206-44-0

Fluoranthene

41

1,700

ug/kg

OWR-SS-LF08-00.5-601

9/19

330- 330

1,700

54 - 500

240,000 N

NA

NA

No

BSL

86-73-7

Fluorene

740

740

ug/kg

OWR-SS-LF08-00.5-601

1/19

330- 330

740

ND

240,000 N

NA

NA

No

BSL

193-39-5

lndeno(1,2,3-cd)pyrene

41

150

ug/kg

OWR-SS-JK98-00.5-601

3/19

330- 330

150

ND

1,100 C

NA

NA

No

BSL

91-20-3

Naphthalene

9,800

9,800

ug/kg

OWR-SS-LF08-00.5-601

1/19

330- 330

9,800

ND

3,800 C

NA

NA

Yes

ASL

86-30-6

N-Nitrosodiphenylamine

780

780

ug/kg

OWR-SS-LF08-00.5-601

1/19

330- 330

780

ND

110,000 c

NA

NA

No

BSL

85-01-8

Phenanthrene

37

2,900

ug/kg

OWR-SS-LF08-00.5-601

5/19

330- 330

2,900

290

180,000 N(7)

NA

NA

No

BSL

129-00-0

Pyrene

48

1,900

ug/kg

OWR-SS-LF08-00.5-601

8/19

330- 330

1,900

55 - 440

180,000 N

NA

NA

No

BSL

Pesticides/PCBs |

5103-71-9

alpha-Chlordane

18

140

ug/kg

OWR-SS-BP91-00.5-601

2/19

1.7-1.7

140

ND

1,700 C(8)

NA

NA

I No |

BSL

60-57-1

Dieldrin

4.8

110

ug/kg

OWR-SS-LF08-00.5-601

2/19

3.3-3.3

110

11

34 C

NA

NA

na

ASL

1031-07-8

Endosulfan Sulfate

5.7

5.7

ug/kg

OWR-SS-TP02-00.5-601

1/19

3.3-3.3

5.7

ND

47,000 N(9)

NA

NA

No

BSL

72-20-8

Endrin

6.5

6.5

ug/kg

OWR-SS-LF08-00.5-601

1/19

3.3-3.3

6.5

ND

1,900 N

NA

NA

No

BSL

7421-93-4

Endrin Aldehyde

82

82

ug/kg

OWR-SS-LF08-00.5-601

1/19

3.3-3.3

82

ND

1,900 N(10)

NA

NA

No

BSL

53494-70-5

Endrin Ketone

18

18

ug/kg

OWR-SS-LF08-00.5-601

1/19

3.3-3.3

18

ND

1,900 N(10)

NA

NA

No

BSL

5103-74-2

gamma-Chlordane

3.5

100

ug/kg

OWR-SS-BP91-00.5-601

3/19

1.7-1.7

100

2.4-2.6

1,700 C(8)

NA

NA

No

BSL

76-44-8

Heptachlor

2.1

2.1

ug/kg

OWR-SS-BP91-00.5-601

1/19

1.7-1.7

2.1

ND

130 C

NA

NA

No

BSL

1024-57-3

Heptachlor Epoxide

2.1

18

ug/kg

OWR-SS-BP91-00.5-601

3/19

1.7-1.7

18

3

70 C

NA

NA

No

BSL

72-54-8

p,p-DDD

13

13

ug/kg

OWR-SS-LF08-00.5-601

1/19

3.3-3.3

13

ND

190 N

NA

NA

No

BSL

72-55-9

p.p-DDE

29

29

ug/kg

OWR-SS-LF08-00.5-601

1/19

3.3-3.3

29

ND

2,000 C

NA

NA

No

BSL

50-29-3

p,p-DDT

11

26

ug/kg

OWR-SS-LF08-00.5-601

3/19

3.3-3.3

26

11 - 18

1,900 C

NA

NA

No

BSL

11097-69-1

PCB-1254

44

46

ug/kg

OWR-SS-LF01-00.5-601,
OWR-SS-TP02-00.5-601

3/19

33-33

46

51 - 250

120 N

NA

NA

No

BSL

Inorganics































7429-90-5

Aluminum

3,030

16,100

mg/kg

OWR-SS-LF08-00.5-601

20/20



16,100

4,940 - 14,200

7,700 N

NA

NA



ASL

7440-36-0

Antimony

0.74 JL

37.1 L

mg/kg

OWR-SS-TP02-00.5-601

10/20

3.5- 12

37.1

1.1 JL- 1.9 JL

3.1 N

NA

NA



ASL

7440-38-2

Arsenic

1.8 J

8.1

mg/kg

OWR-SS-BP91-00.5-601

20/20



8.1

3.6 - 7.9

0.68 C

NA

NA



ASL

7440-39-3

Barium

40.1 J

145

mg/kg

OWR-SS-LF08-00.5-601

20/20



145

61.9 - 118

1,500 N

NA

NA

No

BSL

7440-41-7

Beryllium

0.16 J

0.84

mg/kg

OWR-SS-HF01-00.5-601

20/20



0.84

0.15 J - 0.95 J

16 N

NA

NA

No

BSL

7440-43-9

Cadmium

0.13 J

3.5

mg/kg

OWR-SS-LF08-00.5-601

6/20

1 - 1

3.5

0.81 J - 2.1

7.1 N

NA

NA

No

BSL

7440-70-2

Calcium

289 J

83,300

mg/kg

OWR-SS-TP01-00.5-601

20/20



83,300

256 J - 17,500

NA

NA

NA

No

NUT

7440-47-3

Chromium

7.3

79.5

mg/kg

OWR-SS-BP91-00.5-601

21/21



79.5

11.6 - 164

12,000 N(11)

NA

NA

No

BSL

7440-48-4

C



14.1

mg/kg

OWR-SS-JK02-00.5-601

20/20



14.1

3.3 - 7.8 J

2.3 N

NA

NA



ASL

7440-50-8

C

llff 1 5.4

4,530 J

mg/kg

OWR-SS-AR07-00.5-601

20/20



4,530

5.7 - 267 J

310 N

NA

NA



ASL

7439-89-6

Ir

9 I 4,120

49,400

mg/kg

OWR-SS-LF08-00.5-601

20/20



49,400

9,340 - 173,000

5,500 N

NA

NA



ASL

7439-92-1

L

kwlliiMiiM 12.5 L

1,650 L

mg/kg

OWR-SS-TP02-00.5-601

20/20



1,650

26.1 - 969 L

200 (12i

NA

NA



ASL

7439-95-4

iMagnesium 1

430 J

51,300

mg/kg

OWR-SS-TP01-00.5-601

20/20



51,300

736 - 6,840

NA

NA

NA

HnoH

NUT

7439-96-5

Manganese

37.2

632

mg/kg

OWR-SS-TY06-00.5-601

20/20



632

204 - 1570

180 N

NA

NA

Yes

ASL

7439-97-6

I Mercury

0.06 J

0.42

mg/kg

OWR-SS-LF08-00.5-601

6/20

o
o

0.42

0.07 J - 0.21

!1.1 NI

NA

NA

i No

BSL

Exposure
Point


-------
Scenario Timeframe: Current/Future

Medium: Surface Soil

Exposure Medium: Surface Soii	

TABLE 2.1

OCCURRENCE, DISTRIBUTION, AND SELECTION OF CHEMICALS OF POTENTIAL CONCERN - DIRECT CONTACT WITH SURFACE SOIL

OLD WILMINGTON ROAD SITE
PAGE 2 OF 2

Exposure
Point

CAS
Number

Chemical

Minimum
Concentration'1'

Maximum
Concentration'1'

Units

Sample of Maximum
Concentration

Frequency
of

Detection

Range of
Detection
Limits'2'

Concentration
Used for
Screening'3'

Range of
Background
Concentrations'4'

USEPA RSL
Residential SoilP)

Potential
ARAR/TBC

Potential
ARAR/TBC
Source

COPC
Flag

Rationale for
Contaminant
Deletion or
Selection'5'

OWR

jlnorganics (Continued) |



7440-02-0

Nickel

4.7 J

35

mq/kq

OWR-SS-LF08-00.5-601

20/20



35

4.7 - 70.6

150 N

NA

NA

No

BSL



7440-09-7

Potassium

484 J

1,180 J

mq/kq

OWR-SS-LF07-00.5-601

20/20



1,180

504 J - 1,050 J

NA

NA

NA

No

NUT



7782-49-2

Selenium

0.79 JK

2.5

mg/kg

OWR-SS-LF08-00.5-601

7/20

1 - 1

2.5

1.1 J - 3.4

39 N

NA

NA

No

BSL



7440-22-4

Silver

0.21 J

2.3 J

mq/kq

OWR-SS-LF08-00.5-601

18/20

2-2

2.3

0.26 J - 3

39 N

NA

NA

No

BSL



7440-23-5

Sodium

112

296 J

mg/kg

OWR-SS-AR07-00.5-601

20/20



296

108 J - 236 J

NA

NA

NA

No

NUT



7440-62-2

Vanadium

6.5 J

44.6

mg/kg

OWR-SS-JK02-00.5-601

20/20



44.6

16.9 - 63.4

39 N

NA

NA



ASL



7440-66-6

Zinc

21.4

2,450

mg/kg

OWR-SS-LF08-00.5-601

20/20



2,450

22.5 - 984

2,300 N

NA

NA



ASL



57-12-5

iCyanide

0.07

1.6

mg/kg

OWR-SS-LF08-00.5-601

12/20

o
o

1.6

0.06 JL-0.66 JL

I 2.3 N I

NA

NA

i No I

BSL

Footnotes:

1	- Sample and duplicate are considered as two separate samples when determining the minimum and maximum concentrations.

2	- Values presented are sample-specific quantitation limits.

3	- The maximum detected concentration is used for screening purposes.

4	- Background data is presented for information purposes only and was not used in the selection of COPCs.

5	- USEPA Regional Screening Levels (RSLs) for Chemical Contaminants at Superfund Sites, May 2018. The noncarcinogenic values (denoted with a "N" flag)

correspond to a target hazard quotient of 0.1. Carcinogenic values represent an incremental cancer risk of 1E-06 (carcinogens denoted with a "C" flag).

6	- The chemical is selected as a COPC if the maximum detected concentration exceeds the risk-based COPC screening level.

7	- Value is for pyrene.

8	- Value is for chlordane.

9	- Value is for endosulfan.

10	- Value is for endrin.

11	- Hexavalent chromium was not detected in any soil sample, therefore total chromium was evaluated as trivalent chromium.

12	- USEPA, 2016.Updated Scientific Considerations for Lead in Soil Cleanups, December.

Shaded criterion indicates that the maximum detected concentration exceeds one or more screening criteria. Shaded chemical name indicates that the
chemical was retained as a COPC.

Definitions:

ARAR/TBC = Applicable or Relevant and Appropriate Requirements To Be Considered
C = Carcinogen

COPC = Chemical Of Potential Concern
J = Estimated value

K = Analyte present. Reported value may be biased high. Actual values is expected to be lower.

L = Analyte present. Reported value may be biased low.

mg/kg = milligrams per kilogram

N = Noncarcinogen

NA = Not Applicable/Not Available

ug/kg = micrograms per kilogram

Rationale Codes:

For selection as a COPC:

ASL = Above Screening Level.

For elimination as a COPC:

BSL = Below COPC Screening Level
NUT = Essential nutrient


-------
Scenario Timeframe: Current/Future
Medium: Surface Soil
Exposure Medium: Surface Soii

TABLE 2.2

OCCURRENCE, DISTRIBUTION, AND SELECTION OF CHEMICALS OF POTENTIAL CONCERN - MIGRATION FROM SUBSURFACE SOIL TO GROUNDWATER

OLD WILMINGTON ROAD SITE
PAGE 1 OF 2

Exposure
Point

CAS
Number

Minimum
Concentration'1

Maximum
Concentration'1

Sample of Maximum
Concentration

Frequency
of

Detection

Range of
Detection
Limits'2'

Concentration
Used for
Screening'3'

Range of
Background
Concentrations'4,

USEPA RSL
Migration from Soil
to Groundwater'5'

Potential
ARAR/TBC

Potential
ARAR/TBC
Source

COPC
Flag

Rationale for
Contaminant
Deletion or
Selection*5'

78-93-3 |2-Butanone j 26

43

ug/kg

OWR-SS-AR19-00.5-601

2/73

0
0

43

ND

ssbbbbbbbbJ^b^bb

410 N

NA

NA

No
No

BSL

67-64-1

Acetone

2

930

ug/kg

OWR-SS-AR19-00.5-601

12/73

4- 10

930

10

NA

NA

ASL

79-20-9 i Methyl Acetate | 6

7

ug/kg

OWR-SS-AR 10-00.5-601

2/73

0
0

7

ND

NA

NA

BSL

75-09-2 I

9

39

ug/kg

OWR-SS-AR16-00.5-601,
OWR-SS-BP01-00.5-601

73/73



39

10-30

2.7 N



NA

NA

ASL

127-18-' | j

2

2

ug/kg

OWR-SS-JK08-00.5-601,
OWR-SS-JK98-00.5-601

1/73

0
0

2

ND

1.8 N

NA

NA

ASL

Semi volatile Organic Compounds

























91-57-6

2-Methylnaphthalene

9,200

9,200

ug/kg

OWR-SS-LF08-00.5-601

1/19

330- 330

9,200

ND

550 N

NA

NA

m&m

No

ASL

83-32-9

Acenaphthene

520

520

ug/kg

OWR-SS-LF08-00.5-601

1/19

330- 330

520

ND

NA

NA

BSL

120-12-7

Anthracene

400

400

ug/kg

OWR-SS-LF08-00.5-601

1/19

330- 330

400

ND

5,800 N

NA

NA

No

BSL

100-52-j 71

71

uq/kq

OWR-SS-TY06-00.5-601

1/19

330- 330

71

ND

4.1 C



NA

NA



ASL

56-55-3 57

930

ug/kg

OWR-SS-LF08-00.5-601

5/19

330- 330

930

ND

11 C

NA

NA

ASL

50-32-8 68

820

ug/kg

OWR-SS-LF08-00.5-601

5/19

330- 330

820

ND

29 C

NA

NA

ASL

205-99-2

SHH 90

820

ug/kg

OWR-SS-LF08-00.5-601

5/19

330- 330

820

47

300 C

NA

NA

ASL

191-24-2

Benzo(g,h,i)perylene

47

110

ug/kg

OWR-SS-JK98-00.5-601

2/19

330- 330

110

ND

1,300 N(7)

NA

NA

No

BSL

207-08-9

Benzo(k)fluoranthene

69

600

ug/kg

OWR-SS-LF08-00.5-601

5/19

330- 330

600

ND

2,900 C

NA

NA

No

BSL

85-68-7

Benzyl Butyl Phthalate

57

340

ug/kg

OWR-SS-TP04-00.5-601

3/19

330- 330

340

200

240 C



NA

NA



ASL

92-52-4

Biphenyl (Diphenyl)

1,200

1,200

ug/kg

OWR-SS-LF08-00.5-601

1/19

330- 330

1,200

ND

0.87 N

NA

NA

ASL

117-81-7

Bis(2-Ethylhexyl) Phthalate

45

1,100

ug/kg

OWR-SS-LF08-00.5-601

17/19

330- 330

1,100

75 - 690

1,300 C

NA

NA

No

BSL

218-01-9

Chrysene

100

1,200

ug/kg

OWR-SS-LF08-00.5-601

5/19

330- 330

1,200

52 - 320

9,000 C

NA

NA

No

BSL

132-64-9

Dibenzofuran

510

510

ug/kg

OWR-SS-LF08-00.5-601

1/19

330- 330

510

ND

15 N



NA

NA

i

ASL

84-74-2

di-n-Butyl Phthalate

43

590

ug/kg

OWR-SS-TP02-00.5-601

3/19

330- 330

590

56

230 N

NA

NA

ASL

206-44-0 iFluoranthene j 41

1,700

ug/kg

OWR-SS-LF08-00.5-601

9/19

330- 330

1,700

54 - 500

^8^00N
! 980 C

NA

NA

BSL

I 86-73-7 |

Fluorene

I 740 |

740

ug/kg

OWR-SS-LF08-00.5-601

1/19

330- 330

740

ND

NA

NA

ASL

I 193-39-5 !lndeno(1,2,3-cd)pyrene j 41 I

150

ug/kg

OWR-SS-JK98-00.5-601

3/19

330- 330

150

ND

NA

NA

BSL

91-20-3

Naphthalene

9,800

9,800

ug/kg

OWR-SS-LF08-00.5-601

1/19

330- 330

9,800

ND





NA

NA

ASL

86-30-6

N-Nitrosodiphenylamine

780

780

ug/kg

OWR-SS-LF08-00.5-601

1/19

330- 330

780

ND

NA

NA

ASL

85-01-8

Phenanthrene

37

2,900

ug/kg

OWR-SS-LF08-00.5-601

5/19

330- 330

2,900

290

NA

NA

ASL

129-00-0

Pyrene

48

1,900

uq/kq

OWR-SS-LF08-00.5-601

8/19

330- 330

1,900

55 - 440



NA

NA

ASL

(Pesticides/PCBs



5103-71-9

alpha-Chlordane

18

140

ug/kg

OWR-SS-BP91-00.5-601

2/19

1.7-1.7

140

ND

2.7 C



NA

NA

ASL

60-57-1

Dieldrin

4.8

110

ug/kg

OWR-SS-LF08-00.5-601

2/19

3.3-3.3

110

11

0.071 C



NA

NA

ASL

1031-07-8

Endosulfan Sulfate

5.7

5.7

ug/kg

OWR-SS-TP02-00.5-601

1/19

3.3-3.3

5.7

| ND \ 140 N(9)

NA

NA

No

BSL

72-20-8

Endrin

6.5

6.5

ug/kg

OWR-SS-LF08-00.5-601

1/19

3.3-3.3

6.5

ND

! 9.2 N

mmmm



NA

NA

No

BSL

7421-93-4

Endrin Aldehyde

82

82

ug/kg

OWR-SS-LF08-00.5-601

1/19

3.3-3.3

82

ND

10)

NA

NA



ASL

53494-70-5

Endrin Ketone

18

18

ug/kg

OWR-SS-LF08-00.5-601

1/19

3.3-3.3

18

ND

9.2 N(10i
2.7 c'8i
0.12 C
0.028 C
1.5 N
11 C

2 C

NA

NA



ASL

5103-74-2

gamma-Chlordane

3.5

100

ug/kg

OWR-SS-BP91-00.5-601

3/19

1.7- 1.7

100

2.4-2.6

NA

NA

Yes

ASL

76-44-8

Heptachlor

2.1

2.1

ug/kg

OWR-SS-BP91-00.5-601

1/19

1.7-1.7

2.1

ND

NA

NA

Yes

ASL

1024-57-3

Heptachlor Epoxide

2.1

18

ug/kg

OWR-SS-BP91-00.5-601

3/19

1.7-1.7

18

3

NA

NA



ASL

72-54-8

p,p-DDD

13

13

ug/kg

OWR-SS-LF08-00.5-601

1/19

3.3-3.3

13

ND

NA

NA

No

ASL

72-55-9

p,p-DDE

29

29

ug/kg

OWR-SS-LF08-00.5-601

1/19

3.3-3.3

29

ND

NA

NA

ASL

i 50-29-3 ip,p-DDT j 11 |

26

ug/kg

OWR-SS-LF08-00.5-601

3/19

3.3-3.3

26

11 - 18

NA

NA

BSL

11097-69-1

PCB-1254

44

46

ug/kg

OWR-SS-LF01-00.5-601,
OWR-SS-TP02-00.5-601

3/19

33-33

46

51 - 250

NA

NA

ASL

Inorganics

mg/kg

mg/kg

mg/kg

mg/kg

mg/kg

mg/kg

OWR-SS-LF08-00.5-601

QWR-SS-TP02-00.5-601

OWR-SS-BP91-00.5-601

OWR-SS-LF08-00.5-601

OWR-SS-HF01-00.5-601

QWR-SS-LF08-00.5-601

OWR-SS-TP01-00.5-601

4,940 - 14,200

1.1 JL- 1.9 JL

0.15 J - 0.95 J

256 J - 17,500

7440-47-3 Chromium

mg/kg

OWR-SS-BP91-00.5-601

mg/kg

OWR-SS-JK02-00.5-601

mg/kg

OWR-SS-AR07-00.5-601

mg/kg

OWR-SS-LF08-00.5-601

9,340 - 173,000

mg/kg
mg/kg

mg/kg

QWR-SS-TP02-00.5-601
OWR-SS-TPQ1-00.5-601
QWR-SS-TY06-00.5-601
OWR-SS-LF08-00.5-601


-------
Scenario Timeframe: Current/Future
Medium: Surface Soil
Exposure Medium: Surface Soii

TABLE 2.2

OCCURRENCE, DISTRIBUTION, AND SELECTION OF CHEMICALS OF POTENTIAL CONCERN - MIGRATION FROM SUBSURFACE SOIL TO GROUNDWATER

OLD WILMINGTON ROAD SITE
PAGE 2 OF 2

Exposure
Point

CAS
Number

Chemical

Minimum
Concentration'1'

Maximum
Concentration'1'

Units

Sample of Maximum
Concentration

Frequency
of

Detection

Range of
Detection
Limits'2'

Concentration
Used for
Screening'3'

Range of
Background
Concentrations'4'

USEPA RSL
Migration from Soil
to Groundwater'5'

Potential
ARAR/TBC

Potential
ARAR/TBC
Source

COPC
Flag

Rationale for
Contaminant
Deletion or
Selection'5'

OWR

jlnorganics (Continued)





























7440-02-0

Nickel

4.7 J

35

mq/kq

OWR-SS-LF08-00.5-601

20/20



35

4.7 - 70.6

2.6 N

NA

NA

Yes

ASL



7440-09-7

Potassium

484 J

1,180 J

mq/kq

OWR-SS-LF07-00.5-601

20/20



1,180

504 J - 1,050 J

! NA

NA

NA

I No

NUT



7782-49-2

Selenium

0.79 JK

2.5

mg/kg

OWR-SS-LF08-00.5-601

7/20

1 - 1

2.5

1.1 J - 3.4

0.052 N

NA

NA

Yes

ASL



7440-22-4

Silver

0.21 J

2.3 J

mq/kq

OWR-SS-LF08-00.5-601

18/20

2-2

2.3

0.26 J - 3

0.08 N

NA

NA

Yes

ASL



I 7440-23-5 jSodium

112

296 J

mg/kg

OWR-SS-AR07-00.5-601

20/20



296

108 J - 236 J

! NA

NA

NA

i No

NUT



7440-62-2

Vanadium

6.5 J

44.6

mg/kg

OWR-SS-JK02-00.5-601

20/20



44.6

16.9 - 63.4

8.6 N

NA

NA

Yes

ASL



7440-66-6

Zinc

21.4

2,450

mg/kg

OWR-SS-LF08-00.5-601

20/20



2,450

22.5 - 984

37 N

NA

NA

Yes

ASL



57-12-5

Cyanide

0.07

1.6

mg/kg

OWR-SS-LF08-00.5-601

12/20

o
o

1.6

0.06 JL-0.66 JL

0.0015 N

NA

NA

Yes

ASL

Footnotes:

1	- Sample and duplicate are considered as two separate samples when determining the minimum and maximum concentrations.

2	- Values presented are sample-specific quantitation limits.

3	- The maximum detected concentration is used for screening purposes.

4	- Background data is presented for information purposes only and was not used in the selection of COPCs.

5	- USEPA Regional Screening Levels (RSLs) for Chemical Contaminants at Superfund Sites, May 2018. The noncarcinogenic values (denoted with a "N" flag)

correspond to a target hazard quotient of 0.1. Carcinogenic values represent an incremental cancer risk of 1E-06 (carcinogens denoted with a "C" flag).

6	- The chemical is selected as a COPC if the maximum detected concentration exceeds the risk-based COPC screening level.

7	- Value is for pyrene.

8	- Value is for chlordane.

9	- Value is for endosulfan.

10	- Value is for endrin.

11	- Hexavalent chromium was not detected in any soil sample, therefore total chromium was evaluated as trivalent chromium.

12	- Value is MCL based soil screening level.

Shaded criterion indicates that the maximum detected concentration exceeds one or more screening criteria. Shaded chemical name indicates that the
chemical was retained as a COPC.

Definitions:

ARAR/TBC = Applicable or Relevant and Appropriate Requirements To Be Considered
C = Carcinogen

COPC = Chemical Of Potential Concern
J = Estimated value

K = Analyte present. Reported value may be biased high. Actual values is expected to be lower.

L = Analyte present. Reported value may be biased low.

mg/kg = milligrams per kilogram

N = Noncarcinogen

NA = Not Applicable/Not Available

ug/kg = micrograms per kilogram

Rationale Codes:

For selection as a COPC:

ASL = Above Screening Level.

For elimination as a COPC:

BSL = Below COPC Screening Level
NUT = Essential nutrient
NTX = No toxicity criteria


-------
Scenario Timeframe: Current/Future
Medium: Subsurface Soil
Exposure Medium: Subsurface Soii

TABLE 2.3

OCCURRENCE, DISTRIBUTION, AND SELECTION OF CHEMICALS OF POTENTIAL CONCERN - DIRECT CONTACT WITH SUBSURFACE SOIL

OLD WILMINGTON ROAD SITE
PAGE 1 OF 1

Exposure
Point

CAS
Number

Chemical

Minimum
Concentration'1'

Maximum
Concentration'1'

Units

Sample of Maximum
Concentration

Freguency
of

Detection

Range of
Detection
Limits'2'

Concentration
Used for
Screening'3'

Range of
Background
Concentrations'4'

USEPA RSL
Residential SoilP)

Potential
ARAR/TBC

Potential
ARAR/TBC
Source

COPC
Flag

Rationale for
Contaminant
Deletion or
Selection'5'

OWR

Semivolatile Organic Compounds |



117-81-7

Bis(2-Ethylhexyl) Phthalate

44 J

630

ug/kg

OWR-SB-4DP1-17-201

12/18

330- 330

630

NA

39,000 C

NA

NA

No

BSL



84-66-2

Diethyl Phthalate

110 J

110 J

ug/kg

OWR-SB-4DP1-17-201

1/18

330- 330

110

NA

5,100,000 N

NA

NA

No

BSL



inorganics































7429-90-5

Aluminum

273

21,500

mq/kq

OWR-SB-4DP10-20-201

18/18



21,500

NA

Mfflmmmmiiimim®

NA

NA

Yes

ASL



7440-36-0

Antimony

0.69 JL

1.1 JL

mg/kg

OWR-SB-4DP10-20-201

4/18

12- 12

1.1

NA

3.1 N

NA

NA

No

BSL



7440-38-2

Arsenic

1.8 JK

4 K

mg/kg

OWR-SB-2TP9-1-201

5/18

2-2

4

NA

0.68 C

NA

NA

Yes

ASL



7440-39-3

Barium

3.4 J

84

mg/kg

OWR-SB-4DP10-20-201

18/18



84

NA

1,500 N

NA

NA

No

BSL



7440-41-7

Beryllium

0.061 J

1.3

mg/kg

OWR-SB-4DP10-20-201

7/18

0.069- 0.29

1.3

NA

16 N

NA

NA

No

BSL



7440-70-2

Calcium

4.3 JL

1,020 J

mq/kq

OWR-SB-2TP6-12-201

17/18

723.5- 1000

1,020

NA

NA

NA

NA

No

NUT



7440-47-3

Chromium

0.63 J

20.1

mg/kg

OWR-SB-2TP9-1-201

17/18

0.25-0.25

20.1

NA

12,000 N(7)

NA

NA

No

BSL



7440-48-4

Cobalt

0.23 J

17.6

mg/kg

OWR-SB-4DP10-20-201

11/18

o
o

17.6

NA

2.3 N

NA

NA

gggjggg

ASL



7440-50-8

! Copper

0.16 J

84.9

mg/kg

OWR-SB-4DP10-20-201

18/18



84.9

NA

j 310 N |

NA

NA

ran

BSL



7439-89-6

Iron

289

42,000

mg/kg

OWR-SB-4DP10-20-201

18/18



42,000

NA



NA

NA



ASL



7439-92-1

Lead

0.61 L

13.5

mg/kg

OWR-SB-1TP9-15-201

18/18



13.5

NA

j 200 (8) |

NA

NA

	No	

BSL



7439-95-4

Magnesium

18.6 J

13,900

mq/kq

OWR-SB-4DP10-20-201

17/18

13- 13

13,900

NA

I NA |

NA

NA

j No

NUT



7439-96-5

Manganese

2.1 J

379 J

mg/kg

OWR-SB-2TP6-12-201

16/18

0.56-0.67

379

NA

180 N

NA

NA

Yes

ASL



7440-02-0

Nickel

0.31 J

15.2

mg/kg

OWR-SB-4DP10-20-201

14/18

8-8

15.2

NA

150 N

NA

NA

No

BSL



7440-09-7

Potassium

57.8 J

14,200 J

mq/kq

OWR-SB-4DP10-20-201

18/18



14,200

NA

NA

NA

NA

No

NUT



7782-49-2

Selenium

1.4 L

1.4 L

mg/kg

OWR-SB-1 TP7/8-13-201

1/18

1 - 1

1.4

NA

39 N

NA

NA

No

BSL



7440-28-0

Thallium

1.8 JK

5.6

mg/kg

OWR-SB-4DP10-20-201

9/18

1.45-2

5.6

NA

0.078 N

NA

NA



ASL



7440-62-2

Vanadium

0.24 J

52.4

mg/kg

OWR-SB-4DP10-20-201

18/18



52.4

NA

39 N

NA

NA



ASL



i 7440-66-6 iZinc

0.32 JL

45.8

mg/kg

OWR-SB-4DP10-20-201

16/18

4-4

45.8

NA

I 2,300 N I

NA

NA

I No I

BSL

Footnotes:

1	- Sample and duplicate are considered as two separate samples when determining the minimum and maximum concentrations.

2	- Values presented are sample-specific quantitation limits.

3	- The maximum detected concentration is used for screening purposes.

4	- No background data available for subsurface soil.

5	- USEPA Regional Screening Levels (RSLs) for Chemical Contaminants at Superfund Sites, May 2018. The noncarcinogenic values (denoted with a "N" flag)

correspond to a target hazard quotient of 0.1. Carcinogenic values represent an incremental cancer risk of 1E-06 (carcinogens denoted with a "C" flag).

6	- The chemical is selected as a COPC if the maximum detected concentration exceeds the risk-based COPC screening level.

7	- Hexavalent chromium was not detected in any soil sample, therefore total chromium was evaluated as trivalent chromium.

8	- USEPA, 2016.Updated Scientific Considerations for Lead in Soil Cleanups, December.

Shaded criterion indicates that the maximum detected concentration exceeds one or more screening criteria. Shaded chemical name indicates that the
chemical was retained as a COPC.

Definitions:

ARAR/TBC = Applicable or Relevant and Appropriate Requirements To Be Considered
C = Carcinogen

COPC = Chemical Of Potential Concern
J = Estimated value

K = Analyte present. Reported value may be biased high. Actual values is expected to be lower

L = Analyte present. Reported value may be biased low.

mg/kg = milligrams per kilogram

N = Noncarcinogen

NA = Not Applicable/Not Available

ug/kg = micrograms per kilogram

Rationale Codes:

For selection as a COPC:

ASL = Above Screening Level.

For elimination as a COPC:
BSL = Below COPC Screening Level
NUT = Essential nutrient


-------
Scenario Timeframe: Current/Future
Medium: Subsurface Soil
Exposure Medium: Subsurface Soii

TABLE 2.4

OCCURRENCE, DISTRIBUTION, AND SELECTION OF CHEMICALS OF POTENTIAL CONCERN - MIGRATION FROM SUBSURFACE SOIL TO GROUNDWATER

OLD WILMINGTON ROAD SITE
PAGE 1 OF 1

Exposure
Point

CAS
Number

Chemical

Minimum
Concentration'1'

Maximum
Concentration'1'

Units

Sample of Maximum
Concentration

Freguency
of

Detection

Range of
Detection
Limits'2'

Concentration
Used for
Screening'3'

Range of
Background
Concentrations'4'

USEPA RSL
Migration from Soil
to Groundwater'5'

Potential
ARAR/TBC

Potential
ARAR/TBC
Source

COPC
Flag

Rationale tor
Contaminant
Deletion or
Selection'5'

OWR

Semi volatile Organic Compounds |



117-81-7

Bis(2-Ethylhexyl) Phthalate

44 J

630

ug/kg

OWR-SB-4DP1-17-201

12/18

330- 330

630

NA

1,300 C

NA

NA

No

BSL



84-66-2

Diethyl Phthalate

110 J

110 J

ug/kg

OWR-SB-4DP1-17-201

1/18

330- 330

110

NA

610 N

NA

NA

No

BSL



Inorganics





























7440-36-0

0.69 JL

1.1 JL

mg/kg

OWR-SB-4DP10-20-201

4/18

12- 12

1.1

NA

0.035 N

NA

NA



ASL



7440-38-2

1.8 JK

4 K

mq/kq

OWR-SB-2TP9-1-201

5/18

2-2

4

NA

0.0015 C

NA

NA



ASL



7440-39-3

2 4 J

84

mg/kg

OWR-SB-4DP10-20-201

18/18



84

NA

16 N

NA

NA



ASL



7440-41-7

Beryllium

0.061 J

1.3

mg/kg

OWR-SB-4DP10-20-201

7/18

0.069- 0.29

1.3

NA

r 1.9 N

NA

NA

No

BSL



7440-70-2

Calcium

4.3 JL

1,020 J

mg/kg

OWR-SB-2TP6-12-201

17/18

723.5- 1000

1,020

NA

NA

NA

NA

No

NUT



7440-47-3

Chromium

0.63 J

20.1

mg/kg

OWR-SB-2TP9-1-201

17/18

0.25-0.25

20.1

NA

4,000,000 N(7)

NA

NA

No

BSL



7440-48-4

Cobalt

0.23 J

17.6

mq/kq

OWR-SB-4DP10-20-201

11/18

o
o

17.6

NA

0.027 N

NA

NA



ASL



7440-50-8

Copper

0.16 J

84.9

mq/kq

OWR-SB-4DP10-20-201

18/18



84.9

NA

2.8 N

NA

NA



ASL



7439-89-6

Iron

289

42,000

mg/kg

OWR-SB-4DP10-20-201

18/18



42,000

NA

35 N

NA

NA



ASL



7439-92-1

Lead

0.61 L

13.5

mg/kg

OWR-SB-1TP9-15-201

18/18



13.5

NA

14(8)

NA

NA

! No

BSL



7439-95-4

Magnesium

18.6 J

13,900

mg/kg

OWR-SB-4DP10-20-201

17/18

13- 13

13,900

NA

NA

NA

NA

jNo

NUT



7439-96-5

Manganese

2.1 J

379 J

mg/kg

OWR-SB-2TP6-12-201

16/18

0.56-0.67

379

NA

2.8 N

NA

NA



ASL



7440-02-0

Nickel

0.31 J

15.2

mg/kg

OWR-SB-4DP10-20-201

14/18

8-8

15.2

NA

2.6 N

NA

NA



ASL



I 7440-09-7 |Potassium

57.8 J

14,200 J

mg/kg

OWR-SB-4DP10-20-201

18/18



14,200

NA

i NA

NA

NA

! No

NUT



7782-49-2

Selenium

1.4 L

1.4 L

mg/kg

OWR-SB-1 TP7/8-13-201

1/18

1 - 1

1.4

NA

0.052 N

NA

NA

Yes

ASL



7440-28-0

Thallium

1.8 JK

5.6

mg/kg

OWR-SB-4DP10-20-201

9/18

1.45-2

5.6

NA

0.0014 N

NA

NA

Yes

ASL



7440-62-2

Vanadium

0.24 J

52.4

mg/kg

OWR-SB-4DP10-20-201

18/18



52.4

NA

8.6 N

NA

NA

Yes

ASL



7440-66-6

Zinc

0.32 JL

45.8

mg/kg

OWR-SB-4DP10-20-201

16/18

4-4

45.8

NA

37 N

NA

NA

Yes

ASL

Footnotes:

1	- Sample and duplicate are considered as two separate samples when determining the minimum and maximum concentrations.

2	- Values presented are sample-specific quantitation limits.

3	- The maximum detected concentration is used for screening purposes.

4	- No background data available for subsurface soil.

5	- USEPA Regional Screening Levels (RSLs) for Chemical Contaminants at Superfund Sites, May 2018. The noncarcinogenic values (denoted with a "N" flag)

correspond to a target hazard quotient of 0.1. Carcinogenic values represent an incremental cancer risk of 1E-06 (carcinogens denoted with a "C" flag).

6	- The chemical is selected as a COPC if the maximum detected concentration exceeds the risk-based COPC screening level

7	- Hexavalent chromium was not detected in any soil sample, therefore total chromium was evaluated as trivalent chromium.

8	- Value is MCL based soil screening level.

Shaded criterion indicates that the maximum detected concentration exceeds one or more screening criteria. Shaded chemical name indicates that the
chemical was retained as a COPC.

Definitions:

ARAR/TBC = Applicable or Relevant and Appropriate Requirements To Be Considered
C = Carcinogen

COPC = Chemical Of Potential Concern
J = Estimated value

K = Analyte present. Reported value may be biased high. Actual values is expected to be lower

L = Analyte present. Reported value may be biased low.

mg/kg = milligrams per kilogram

N = Noncarcinogen

NA = Not Applicable/Not Available

ug/kg = micrograms per kilogram

Rationale Codes:

For selection as a COPC:

ASL = Above Screening Level.

For elimination as a COPC:
BSL = Below COPC Screening Level
NUT = Essential nutrient


-------
OCCURRENCE, DISTRIBUTION,

Scenario Timeframe: Current/Future
Medium: Groundwater
Exposure Medium: Groundwater

TABLE 2.5

SELECTION OF CHEMICALS OF POTENTIAL CONCERN - DIRECT CONTACT WITH GROUNDWATER
OLD WILMINGTON ROAD SITE
PAGE 1 OF 2

Exposure
Point

CAS
Number

Chemical

Minimum
Concentration'1'

Maximum
Concentration'1'

Units

Sample of Maximum
Concentration

Frequency
of

Detection

Range of
Detection
Limits'2'

Concentration
Used for
Screening'3'

Range of
Background
Concentrations'4'

USEPA RSL
Tap water'5'

Potential
ARAR/TBC

Potential
ARAR/TBC
Source

COPC
Flag

Rationale for
Contaminant
Deletion or
Selection*6'

OWR

Volatile Organic Compounds |



71-55-6

1,1,1-Trichloroethane

0.11 J

10

ug/L

OWR-MW03-0816

23/61

0.5-50

10

ND

800 N

NA

NA

No

BSL



76-13-1

1,1,2-Trichloro-1,2,2-Trifluoroethane

0.82

5

ug/L

OWR-MW-08S-0816-RS

7/47

0.5-50

5

ND

1,000 N

NA

NA

No

BSL



75-34-3

1,1-Dichloroethane

0.15 J

2.6

ug/L

OWR-MW08S-0117

37/65

0.5-50

2.6

ND

2.8 C

NA

NA

No

BSL



75-35-4

1,1-Dichloroethene

0.35 J

3.9

ug/L

OWR-MW-08S-0816-RS

6/61

0.5-50

3.9

ND

28 N

NA

NA

No

BSL



106-46-7

1,4-Dichlorobenzene

0.11 J

0.11 J

ug/L

OWR-MW10D-0117

1/61

0.5-50

0.11

ND

0.48 C

NA

NA

No

BSL





7-Butanone

2 J

1,300

ug/L

OWR-MW17-PORT1-110617

9/61

5-500

1,300

ND

560 N

NA

NA

ikygl

ASL



591-78-6

/-Hexanone

41

41

uq/L

OWR-MW17-PORT1-110617

1/61

5-500

41

ND

3.8 N

NA

NA

W9

ASL



108-10-1

4-Methyl-2-Pentanone

0.58 J

1.3 J

ug/L

OWR-MW17-PORT1-0117

2/61

5-500

1.3

ND

630 N

NA

NA

No

BSL



67-64-1

Acetone

2.7 J

91 J

uq/L

OWR-MW17-PORT1-110617

21/62

5-500

91

6-8.8

1,400 N

NA

NA

No

BSL



75-15-0

Carbon Disulfide

0.31 J

14

uq/L

OWR-MW13-0816

14/63

0.5-50

14

ND

81 N

NA

NA

No

BSL



108-90-7

Chlorobenzene

0.12 J

0.12 J

uq/L

OWR-MW-06-0815

1/61

0.5-50

0.12

ND

7.8 N

NA

NA

No

BSL



67-66-3

Chloroform

5.4

9.4

uq/L

OWR-MW-01-0815

2/61

0.5-50

9.4

ND

0.22 C

NA

NA

Yes

ASL



74-87-3

Chloromethane

0.11 J

0.53 J

ug/L

OWR-MW06-0117

8/61

0.5-50

0.53

ND

19N

NA

NA

No

BSL



156-59-2

cis-1,2-Dichloroethene

0.19 J

6.6

ug/L

OWR-MW17-PORT4-110617

20/63

0.5-50

6.6

ND

3.6 N

NA

NA

Yes

ASL



-

m,p-Xylene

0.1 J

0.1 J

ug/L

OWR-MW13-0117

1/61

0.5-50

0.1

ND

19 N(7)

NA

NA

No

BSL



79-20-9

Methyl Acetate

0.77

22

uq/L

OWR-MW17-PORT4-0117

9/62

0.5-50

22

ND

2,000 N

NA

NA

No

BSL



1634-04-4

Methyl Tert-Butyl Ether

0.23 J

15

uq/L

OWR-MW-10S-0815

43/62

0.5-50

15

0.52-0.82

14 C

NA

NA

Yes

ASL



75-09-2

Methylene Chloride

0.12 J

1.4 J-

ug/L

O W R- M W18- PO R T2-0816

4/62

0.5-50

1.4

ND

Tin

NA

NA

No

BSL



95-47-6

o-Xylene

0.11 J

0.11 J

ug/L

OWR-MW14-PORT2-0117

1/61

0.5-50

0.11

ND

19 N

NA

NA

No

BSL



127-18-4

Tetrachloroethene

0.13 J

190

uq/L

OWR-MW-05-0815

29/63

0.5-50

190

0.15 J

4.1 N

NA

NA

Yes

ASL



108-88-3

Toluene

0.1 J

13

ug/L

OWR-MW-23-PORT3-0816-RS

27/67

0.5-50

13

ND

110 N

NA

NA

No

BSL



79-01-6

Trichloroethene

0.16 J

27

uq/L

OWR-MW-08S-0816-RS

29/63

0.5-50

27

ND

0.28 N

NA

NA

Yes

ASL



75-69-4

Trichlorofluoromethane

0.1 J

0.75

ug/L

OWR-MW-08S-0816-RS

7/47

0.5-50

0.75

ND

520 N

NA

NA

No

BSL



75-01-4

Vinyl Chloride

0.16 J

0.57

uq/L

OWR-MW21-0117

3/61

0.5-50

0.57

ND

IWflfWH'TT'Ti fcTW

NA

NA

Yes

ASL



Semivolatile Organic Compounds





























123-91-1

1.1-Dioxane

1 J

5.1 J

ug/L

OWR-MW17-PORT1-0117

19/64

2- 100

5.1

ND

0.46 C

NA

NA

Yes

ASL



106-44-5

4-Methylphenol

1.1 J

4.3 J

ug/L

OWR-MW17-PORT4-110617

5/62

10-500

4.3

ND

190 N

NA

NA

No

BSL



98-86-2

Acetophenone

1.1 J

12

ug/L

OWR-MW17-PORT2-110617

5/64

10-500

12

ND

190 N

NA

NA

No

BSL



100-52-7

Benzaldehyde

1.3 J

4.9 J

ug/L

OWR-MW17-PORT2-110617

2/64

10-500

4.9

ND

19 C

NA

NA

No

BSL



117-81-7

Bis(2-ethylhexyl)phthalate

1.3 J

11

uq/L

OWR-MW15-0816

4/64

5-250

11

ND

5.6 C

NA

NA

Yes

ASL



85-68-7

Benzyl Butyl Phthalate

1.4 J

3.2 J

ug/L

OWR-MW17-PORT2-0816

10/64

5-250

3.2

1.6 J-3.6 J

16 C

NA

NA

No

BSL



105-60-2

Caprolactam

3.5 J

2,800

uq/L

OWR-MW17-PORT1-110617

14/64

10- 11

2,800

ND

990 N

NA

NA

Yes

ASL



84-66-2

Diethylphthalate

1.2 J

2.7 J

ug/L

OWR-MW17-PORT4-110617

3/64

5-250

2.7

ND

1,500 N

NA

NA

No

BSL



131-11-3

Dimethylphthalate

2.3 J

2.3 J

ug/L

OWR-MW-06-0815

1/64

5-250

2.3

ND

NA

NA

NA

No

NTX



84-74-2

Di-N-Butylphthalate

1.2 J

41

ug/L

OWR-MW18-PORT2-0816

5/64

5-250

41

1.6 J- 1.6 J

90 N

NA

NA

No

BSL



108-95-2

Phenol

2.5 J

4.3 J

uq/L

OWR-MW17-PORT4-110617

3/64

10-500

4.3

ND

580 N

NA

NA

No

BSL



Semivolatiles-Sim





























123-91-1

1,4-Dioxane

0.12 J

20 J

ug/L

OWR-MW18-PORT2-0816

39/50

0.4-0.5

20

0.21 J-0.58 J

0.46 C

NA

NA

H

i ASL



Total Inorganics





























7429-90-



14.1 J

301,000

ug/L

OWR-MW-06-0815

56/59

20-20

301,000

103-139

2,000 N

NA

NA

Yes

ASL



7440-36-



0.23 J

10.2 J

ug/L

O W R- M W17- PO R T2- 0117

7/59

2-2

10.2

ND

0.78 N

NA

NA

Yes

ASL



7440-38-



0.07 J

60.1

ug/L

O W R- M W23- PO R T2- 0117

32/59

1 - 1

60.1

0.46 J-0.46 J

0.052 C

NA

NA

Yes

ASL



7440-39-



15.2

3,310

ug/L

OWR-MW23-PORT3-0816

58/59

10- 10

3,310

128-143

380 N

NA

NA

Yes

ASL



7440-41-



0.23 J

17.8

ug/L

O W R- M W23- PO R T2- 0117

13/59

1 - 1

17.8

0.17 J - 0.19 J

2.5 N

NA

NA

Yes

ASL



7440-43-9

Cadmium

0.1 J

1.5

ug/L

OWR-MW-06-0815

9/59

1 - 10

1.5

0.1 J-0.1 J

0.92 N

NA

NA

Yes

ASL



7440-70-2

Calcium

419 J

170,000

ug/L

OWR-MW21-0117

57/59

500 - 500

170,000

2,150- 2,470

NA

NA

NA

No

NUT



7440-47-3

Chromium

2.1

546

ug/L

OWR-MW06-0816

42/62

2-2

546

ND

2,200 N(8)

NA

NA

No

BSL



7440-48-4

Cobalt

0.11 J

232

ug/L

OWR-MW10D-0816

51/59

1 - 1

232

5.6-6.6

0.6 N

NA

NA

Yes

ASL



7440-50-8

Copper

0.5 J

739

ug/L

OWR-MW-06-0815

45/59

1.2-2

739

11.4- 13.9

80 N

NA

NA

Yes

ASL



7439-89-6

Iron

55.8 J

380,000 J

uq/L

OWR-MW17-PORT2-0117

49/59

42.6- 200

380,000

14.5J-21.6J

1,400 N

NA

NA

Yes

ASL



7439-92-1

Lead

0.11 J

217

ug/L

OWR-MW17-PORT2-0117

32/59

1 - 1

217

0.2 J-0.2 J

15

NA

NA

Yes

ASL



i 7439-95-4 jMaqnesium

677

81,400

uq/L

OWR-MW17-PORT2-0117

59/59



81,400

3,050- 3,530

! NA

NA

NA

I No

NUT



7439-96-5

Manganese

3.8

10,900

ug/L

OWR-MW10D-0816

59/59



10,900

243 - 308

43 N

NA

NA

Yes

ASL



7439-97-6

Mercury

0.021 J-

0.23

uq/L

OWR-MW06-0117

17/48

0.2-2

0.23

0.25-0.71

0.063 N

NA

NA

Yes

ASL



7440-02-0

Nickel

0.4 J

368

ug/L

OWR-MW-06-0815

56/59

1 - 1

368

2.9-3.3

39 N

NA

NA

Yes

ASL



i 9/7/7440 iPotassium

1,210

35,100

uq/L

OWR-MW13-0816

59/59



35,100

2,270- 2,390

! NA

NA



I No

NUT



7782-49-2

Selenium

0.49 J

15.2

ug/L

O W R- M W17- PO R T2- 0816

13/59

5-50

15.2

ND

10 N

NA

NA

Yes

ASL



7440-22-4

Silver

0.029 J

4.7

uq/L

OWR-MW-06-0815

10/59

1 - 1

4.7

ND

9.4 N

NA

NA

No

BSL



7440-23-5

Sodium

1,640

678,000

ug/L

OWR-MW17-PORT1-0117

59/59



678,000

9,260- 12,300

NA

NA



|n^i

NUT



7440-28-0

Ilium

0.1 J

2.3

ug/L

OWR-MW23-PORT2-0117

11/59

1 - 10

2.3

ND

0.02 N

NA

NA



ASL



7440-62-2

adium

0.19 J

93.6

ug/L

OWR-MW-06-0815

31/59

1.675-5

93.6

ND

8.6 N

NA

NA



ASL



7440-66-6

Zinc

2.9

2,020

ug/L

OWR-MW14-PORT2-0816

58/59

2-2

2,020

2.8- 14.4

600 N

NA

NA



ASL


-------
OCCURRENCE, DISTRIBUTION,

Scenario Timeframe: Current/Future
Medium: Groundwater
Exposure Medium: Groundwater

TABLE 2.5

SELECTION OF CHEMICALS OF POTENTIAL CONCERN - DIRECT CONTACT WITH GROUNDWATER
OLD WILMINGTON ROAD SITE
PAGE 2 OF 2

Exposure
Point

CAS
Number

Chemical

Minimum
Concentration'1'

Maximum
Concentration'1'

Units

Sample of Maximum
Concentration

Frequency
of

Detection

Range of
Detection
Limits'2'

Concentration
Used for
Screening'3'

Range of
Background
Concentrations'4'

USEPA RSL
Tap water'5'

Potential
ARAR/TBC

Potential
ARAR/TBC
Source

COPC
Flag

Rationale for
Contaminant
Deletion or
Selection*6'

OWR

Dissolved Inorganics





























7429-90-5

Aluminum

12.7 J

3,920

ug/L

OWR-MW-04-0815

26/54

20-20

3,920

98.6- 121

2,000 N

NA

NA



ASL



7440-36-0

Antimony

0.35 J

6.6

uq/L

OWR-MW-01-0815

8/54

2-2

6.6

ND

0.78 N

NA

NA



ASL



7440-38-2

Arsenic

1.1

21.4

ug/L

OWR-MW17-PORT3-0816

13/54

1 - 2

21.4

ND

0.052 C

NA

NA



ASL



7440-39-3

Barium

2.4 J

215

ug/L

OWR-MW10S-0816

49/54

o
o

215

127-132

380 N

NA

NA

No

BSL



7440-41-7

Beryllium

0.05 J

0.87 J

ug/L

OWR-MW-04-0815

7/54

1 - 1

0.87

ND

2.5 N

NA

NA

No

BSL



7440-43-9

Cadmium

0.05 J

0.65 J

ug/L

OWR-MW-10S-0815

13/54

1 - 1

0.65

ND

0.92 N

NA

NA

No

BSL



7440-70-2

Calcium

666

89,000

ug/L

OWR-MW21-0117

50/54

500 - 500

89,000

2,190-2,210

NA

NA

NA

No

NUT



7440-47-3

Chromium

0.2 J

269

ug/L

OWR-MW17PORT1-20190408

24/57

2-4

76.2

ND

2,200 N(8)

NA

NA

No

BSL



7440-48-4

Cobalt

0.05 J

240

ug/L

OWR-MW10D-0816

39/54

1 - 1

240

5.7-6.5

0.6 N

NA

NA

Yes

ASL



7440-50-8

Copper

2.1

62.5

ug/L

OWR-MW04-0117

17/54

1 -4

62.5

10.5-10.8

! 80 N

NA

NA

I No

BSL



7439-89-6

Iron

34.9 J

61,000

ug/L

OWR-MW18-PORT2-0816

20/54

200 - 400

61,000

ND



NA

NA

Yes

ASL



7439-92-1

Lead

0.12 J-

14.2

ug/L

OWR-MW03-0117

9/54

1 -1

14.2

0.19 J-0.23 J

! 15

NA

NA

I

BSL



7439-95-4

Magnesium

220 J

26,000

ug/L

OWR-MW-04-0815

49/54

500 - 500

26,000

2,960- 3,120

i NA

NA

NA

[noJ

NUT



7439-96-5

Manganese

1.4 J

13,400

ug/L

OWR-MW10S-0816

51/54

1 - 1

13,400

249- 301

43 N

NA

NA

¦ETSB

ASL



7439-97-6

Mercury

0.021 J-

0.17 J

ug/L

OWR-MW80-0117-D

4/43

o
o

0.17

0.12 J--0.93

0.063 N

NA

NA



ASL



7440-02-0

Nickel

0.22 J

25.5

ug/L

OWR-MW10S-0816

41/54

1 - 1

25.5

2.8-3.3

39 N

NA

NA

jNol

BSL



7440-09-7

Potassium

402 J

35,800

uq/L

OWR-MW13-0816

53/54

500 - 500

35,800

2,180- 2,440

NA

NA

NA

I No

NUT



7782-49-2

Selenium

0.62 J

19.7

ug/L

O W R- M W17- PO R T2- 0816

10/54

5-5

19.7

ND

10 N

NA

NA

Yes

ASL



I 7440-23-5 jSodium

868

336,000

ug/L

OWR-MW-04-0815

54/54



336,000

8,880- 11,200

i NA

NA

NA

I No

NUT



7440-28-0

Thallium

0.06 J

0.43 J

ug/L

OWR-MW10S-0816

4/54

0.53- 1

0.43

ND

0.02 N

NA

NA

Yes

ASL



7440-62-2

Vanadium

0.82 J

14.3

ug/L

O W R- M W17- PO R T3- 0816

11/54

0.34- 10

14.3

ND

8.6 N

NA

NA

Yes

ASL



7440-66-6

Zinc

1.3 J

1,870 J

ug/L

OWR-MW10D-0816

46/54

2-12.4

1,870

2.3 J - 10.7

600 N

NA

NA

Yes

ASL

Footnotes:

1	- Sample and duplicate are considered as two separate samples when determining the minimum and maximum concentrations.

2	- Values presented are sample-specific quantitation limits.

3	- The maximum detected concentration is used for screening purposes.

4	- Range of concentrations in monitoring well MW-19. Background values are present for information purposes only and were not used for COPC selection.

5	- USEPA Regional Screening Levels (RSLs) for Chemical Contaminants at Superfund Sites, May 2018. RSLs for carcinogens correspond

to an integrated lifetime cancer risk (ILCR) of 1E-06; RSLs for noncarcinogens correspond to a hazard quotient (HQ) of 0.1.

6	- The chemical is selected as a COPC if the maximum detected concentration exceeds the risk-based COPC screening level.

7	- Value is for xylenes.

8	- Hexavalent chromium was not detected in any groundwater sample, therefore total chromium was evaluated as trivalent chromium.

Shaded criterion indicates that the maximum detected concentration exceeds one or more screening criteria. Shaded chemical name indicates that the
chemical was retained as a COPC.

Definitions:

ARAR/TBC = Applicable or Relevant and Appropriate Requirements To Be Considered
C = Carcinogen

COPC = Chemical Of Potential Concern
J = Estimated value

J- = Analyte present but reported value may be biased low

N = Noncarcinogen

NA = Not Applicable/Not Available

ug/L = micrograms per liter

Rationale Codes:

For selection as a COPC:

ASL = Above Screening Level.

For elimination as a COPC:
BSL = Below COPC Screening Level
NUT = Essential nutrient
NTX = No toxicity criteria


-------
TABLE 2.6

OCCURRENCE, DISTRIBUTION, AND SELECTION OF CHEMICALS OF POTENTIAL CONCERN - VAPOR INTRUSION
OLD WILMINGTON ROAD SITE

Scenario Timeframe: Current/Future

Medium: Groundwater

Exposure Medium: Air	

Exposure
Point

CAS
Number

Chemical

Minimum
Concentration'1'

Maximum
Concent ration'1'

Units

Sample of Maximum
Concentration

Freguency
of

Detection

Range of
Detection
Limits'2'

Concentration
Used for
Screening*3'

Range of
Background
Concentrations'4'

USEPA

VISL'5'

Potential
ARAR/TBC

Potential
ARAR/TBC
Source

COPC
Flag

Rationale for
Contaminant
Deletion or
Selection'6'

OWR

Volatile Organic Compounds |



71-55-6

1,1,1-Trichloroethane

0.11 J

10

uq/L

OWR-MW03-0816

23/61

0.5-50

10

ND

740 N

NA

NA

No

BSL



76-13-1

1,1,2-Trichloro-1,2,2-Trifluoroethane

0.82

5

ug/L

OWR-MW-08S-0816-RS

7/47

0.5-50

5

ND

24 N

NA

NA

No

BSL



75-34-3

1,1-Dichloroethane

0.15 J

2.6

ug/L

OWR-MW08S-0117

37/65

0.5-50

2.6

ND

7.6 C

NA

NA

No

BSL



75-35-4

1,1-Dichloroethene

0.35 J

3.9

ug/L

OWR-MW-08S-0816-RS

6/61

0.5-50

3.9

ND

20 N

NA

NA

No

BSL



106-46-7

1,4-Dichlorobenzene

0.11 J

0.11 J

ug/L

OWR-MW10D-0117

1/61

0.5-50

0.11

ND

2.6 C

NA

NA

No

BSL



78-93-3

2-Butanone

2 J

1,300

ug/L

OWR-MW17-PORT1-110617

9/61

5-500

1,300

ND

220,000 N

NA

NA

No

BSL



591-78-6

2-Hexanone

41

41

ug/L

OWR- MW17- PO RT1 -110617

1/61

5-500

41

ND

820 N

NA

NA

No

BSL



108-10-1

4-Methyl-2-Pentanone

0.58 J

1.3 J

ug/L

OWR-MW17-PORT1-0117

2/61

5-500

1.3

ND

56,000 N

NA

NA

No

BSL



67-64-1

Acetone

2.7 J

91 J

uq/L

OWR-MW17-PORT1-110617

21/62

5-500

91

6-8.8

2,300,000 N

NA

NA

No

BSL



75-15-0

Carbon Disulfide

0.31 J

14

ug/L

OWR-MW13-0816

14/63

0.5-50

14

ND

120 N

NA

NA

No

BSL



108-90-7

Chlorobenzene

0.12 J

0.12 J

ug/L

OWR-MW-06-0815

1/61

0.5-50

0.12

ND

41 N

NA

NA

No

BSL



67-66-3

Chloroform

5.4

9.4

ug/L

OWR-MW-01-0815

2/61

0.5-50

9.4

ND

0.81 C

NA

NA

Yes

ASL



74-87-3

Chloromethane

0.11 J

0.53 J

ug/L

OWR-MW06-0117

8/61

0.5-50

0.53

ND

26 N

NA

NA

No

BSL



156-59-2

cis-1,2-Dichloroethene

0.19 J

6.6

ug/L

O W R- M W17- PO R T4-110617

20/63

0.5-50

6.6

ND

NA

NA

NA

No

NTX





m,p-Xylene

0.1 J

0.1 J

ug/L

OWR-MW13-0117

1/61

0.5-50

0.1

ND

36 N(7)

NA

NA

No

BSL



79-20-9

Methyl Acetate

0.77

22

ug/L

O W R- M W17- PO R T4- 0117

9/62

0.5-50

22

ND

NA

NA

NA

No

NTX



1634-04-4

Methyl Tert-Butyl Ether

0.23 J

15

ug/L

OWR-MW-10S-0815

43/62

0.5-50

15

0.52-0.82

450 C

NA

NA

No

BSL



75-09-2

Methylene Chloride

0.12 J

1.4 J-

ug/L

OWR-MW18-PORT2-0816

4/62

0.5-50

1.4

ND

470 N

NA

NA

No

BSL



95-47-6

o-Xylene

0.11 J

0.11 J

ug/L

O W R- M W14- PO R T2- 0117

1/61

0.5-50

0.11

ND

49 N

NA

NA

No

BSL



127-18-4

Tetrachloroethene

0.13 J

190

ug/L

OWR-MW-05-0815

29/63

0.5-50

190

0.15 J

5.8 N

NA

NA

Yes

ASL



108-88-3

Toluene

0.1 J

13

ug/L

OWR-MW-23-PORT3-0816-RS

27/67

0.5-50

13

ND

1,900 N

NA

NA

No

BSL



79-01-6

Trichloroethene

0.16 J

27

ug/L

OWR-MW-08S-0816-RS

29/63

0.5-50

27

ND

0.52 N

NA

NA

Yes

ASL



75-69-4

Ifrichlorofluorometh

0.1 J

0.75

ug/L

OWR-MW-08S-0816-RS

7/47

0.5-50

0.75

ND

I NA |

NA

NA

I No

NTX



75-01-4

Vinyl Chloride

0.16 J

0.57

ug/L

OWR-MW21-0117

3/61

0.5-50

0.57

ND

0.15 C

NA

NA

Yes

ASL



ISemivolatile Organic Compounds





























123-91-1

1,4-Dioxane

1 J

5.1 J

ug/L

OWR-MW17-PORT1-0117

19/64

2- 100

5.1

ND

2,900 C

NA

NA

No

BSL



106-44-5

4-Methylphenol

1.1 J

4.3 J

ug/L

O W R- M W17- PO R T4-110617

5/62

10-500

4.3

ND

NA

NA

NA

No

NTX



98-86-2

Acetophenone

1.1 J

12

ug/L

OWR-MW17-PORT2-110617

5/64

10-500

12

ND

NA

NA

NA

No

NTX



100-52-7

Benzaldehyde

1.3 J

4.9 J

ug/L

OWR-MW17-PORT2-110617

2/64

10-500

4.9

ND

NA

NA

NA

No

NTX



117-81-7

Bis(2-ethylhexyl)phthalate

1.3 J

11

ug/L

OWR-MW15-0816

4/64

5-250

11

ND

NA

NA

NA

No

NTX



85-68-7

Benzyl Butyl Phthalate

1.4 J

3.2 J

ug/L

O W R- M W17- PO R T2- 0816

10/64

5-250

3.2

1.6 J-3.6 J

NA

NA

NA

No

NTX



105-60-2

Caprolactam

3.5 J

2,800

ug/L

OWR-MW17-PORT1-110617

14/64

10-11

2,800

ND

NA

NA

NA

No

NTX



84-66-2

Diethyl phthalate

1.2 J

2.7 J

ug/L

O W R- M W17- PO R T4-110617

3/64

5-250

2.7

ND

NA

NA

NA

No

NTX



131-11-3

Dimethylphthalate

2.3 J

2.3 J

ug/L

OWR-MW-06-0815

1/64

5-250

2.3

ND

NA

NA

NA

No

NTX



84-74-2

Di-N-Butylphthalate

1.2 J

41

ug/L

OWR-MW18-PORT2-0816

5/64

5-250

41

1.6 J -1.6 J

NA

NA

NA

No

NTX



108-95-2

Phenol

2.5 J

4.3 J

ug/L

OWR-MW17-PORT4-110617

3/64

10-500

4.3

ND

NA

NA

NA

No

NTX



ISemivolatiles-Sim |



I 123-91-1 |

M,4-Dioxane

i 0.12 J |

I 20 J |

i uq/L

i O W R- M W18- PO R T2- 0816 |

i 39/50 |

i 0.4-0.5 |

I 20 |

I 0.21 J-0.58 J |

i 2,900 C |

i NA |

i NA |

i No

I BSL |

Footnotes:

1	- Sample and duplicate are considered as two separate samples when determining the minimum and maximum concentrations.

2	- Values presented are sample-specific quantitation limits.

3	- The maximum detected concentration is used for screening purposes.

4	- Range of concentrations in monitoring well MW-19. Background values are present for information purposes only and were not used for COPC selection.

5	- USEPA's Vapor Intrusion Screening Level (VISL) Calculator, Accessed May 16, 2018. The noncarcinogenic values (denoted with a "N" flag)

correspond to a target hazard quotient of 0.1. Carcinogenic values represent an incremental cancer risk of 1E-06 (carcinogens denoted with a "C" flag).

6	- The chemical is selected as a COPC if the maximum detected concentration exceeds the risk-based COPC screening level.

7	- Value is for m-xylenes.

Shaded criterion indicates that the maximum detected concentration exceeds one or more screening criteria. Shaded chemical name indicates that the
chemical was retained as a COPC.

Definitions:

ARAR/TBC = Applicable or Relevant and Appropriate Requirements To Be Considered
C = Carcinogen

COPC = Chemical Of Potential Concern
J = Estimated value

J- = Analyte present but reported value may be biased low

N = Noncarcinogen

NA = Not Applicable/Not Available

ug/L = micrograms per liter

Rationale Codes:

For selection as a COPC:

ASL = Above Screening Level.

For elimination as a COPC:
BSL = Below COPC Screening Level
NUT = Essential nutrient
NTX = No toxicity criteria


-------
Scenario Timeframe: Current/Future
Medium: Surface Water
Exposure Medium: Surface Water

TABLE 2.7

OCCURRENCE, DISTRIBUTION, AND SELECTION OF CHEMICALS OF POTENTIAL CONCERN - DIRECT CONTACT WITH SURFACE WATER

OLD WILMINGTON ROAD SITE
PAGE 1 OF 1

Exposure
Point

CAS
Number

Chemical

Minimum
Concentration'1'

Maximum
Concentration'1'

Units

Sample of Maximum
Concentration

Frequency
of

Detection

Range of
Detection
Limits'2'

Concentration
Used for
Screening'3'

Range of
Background
Concentrations'4'

Screening Toxicity

Value'5'

Potential
ARAR/TBC

Potential
ARAR/TBC
Source

COPC
Flag

Rationale for
Contaminant
Deletion or
Selection'5'

OWR

Volatile Organic Compounds



71-55-6

1,1,1-Trichloroethane

0.31 J

0.69

ug/L

OWR-SW-06-0815

2/8

o
o

0.69

ND

8,000 N

NA

NA

No

BSL



76-13-1

1,1,2-Trichloro-1,2,2-Trifluoroethane

0.2 J

0.2 J

ug/L

OWR-SW-06-0815

1/8

o
o

0.2

ND

10,000 N

NA

NA

No

BSL



75-34-3

1,1-Dichloroethane

0.11 J

0.26 J

ug/L

OWR-SW-06-0815

2/8

o
o

0.26

ND

28 C

NA

NA

No

BSL



74-87-3

Chloromethane

0.29 J

0.29 J

ug/L

OWR-SW-07-0815

1/8

o
o

0.29

ND

190 N

NA

NA

No

BSL



156-59-2

cis-1,2-Dichloroethene

0.21 J

0.21 J

ug/L

OWR-SW-06-0815

1/8

o
o

0.21

ND

36 N

NA

NA

No

BSL



1634-04-4

Methyl Tert-Butyl Ether

0.26 J

0.33 J

ug/L

OWR-SW-06-0815

3/8

o
o

0.33

ND

140 C

NA

NA

No

BSL



75-09-2

Methylene Chloride

0.1 J

0.1 J

ug/L

OWR-SW-05-0815,
OWR-SW-07-0815

2/8

o
o

0.1

0.13 J

110 N

NA

NA

No

BSL



127-18-4

Tetrachloroethene

0.11 J

0.11 J

ug/L

OWR-SW-05-0815

1/8

o
o

0.11

ND

41 N

NA

NA

No

BSL



108-88-3

Toluene

0.61

0.61

ug/L

OWR-SW-06-0815

1/8

o
o

0.61

ND

1,100 N

NA

NA

No

BSL



79-01-6

Trichloroethene

0.45 J

1.3

uq/L

OWR-SW-06-0815

2/8

o
o

1.3

ND

2.8 N

NA

NA

No

BSL



Semivolatile Organic Compounds



131-11-3

Dimethylphthalate

2.6 J

3.6 J

ug/L

OWR-SW-05-0815

2/8

5-5

3.6

ND

NA

NA

NA

No

NTX



Total Inorganics



7429-90-5

Aluminum

50.4

351

ug/L

OWR-SW-17-0815

8/8



351

74.3- 142

20,000 N

NA

NA

No

BSL



7440-38-2

Arsenic

0.19 J

0.5 J

ug/L

OWR-SW-06-0815

8/8



0.5

0.25 J - 0.28 J

0.52 C

NA

NA

No

BSL



7440-39-3

Barium

56.6

487

ug/L

OWR-SW-05-0815

8/8



487

73.4- 77.5

3,800 N

NA

NA

No

BSL



7440-43-9

Cadmium

0.03 J

0.08 J

ug/L

OWR-SW-05-0815

7/8

1 -1

0.08

ND

9.2 N

NA

NA

No

BSL



7440-70-2

Calcium

2,160

30,100

ug/L

OWR-SW-17-0815

8/8



30,100

5,650- 5,970

NA

NA

NA

No

NUT



7440-47-3

Chromium

2.4 J

2.4 J

ug/L

OWR-SW-17-0815

3/10

0.25-2

2.4

ND

22,000 N(7)

NA

NA

No

BSL



7440-48-4

Cobalt

1 J

3.7

ug/L

OWR-SW-06-0815

3/8

1 - 1

3.7

ND

6 N

NA

NA

No

BSL



7440-50-8

Copper

2 J

2.6

ug/L

OWR-SW-05-0815

3/8

2-2

2.6

ND

800 N

NA

NA

No

BSL



7439-89-6

Iron

222

2,000

ug/L

OWR-SW-06-0815

7/8

200- 200

2,000

262

14,000 N

NA

NA

No

BSL



7439-92-1

Lead

1.1

1.2

ug/L

OWR-SW-07-0815

2/8

1 - 1

1.2

ND

15

NA

NA

No

BSL



7439-95-4

Magnesium

2,190

15,600

ug/L

OWR-SW-17-0815

8/8



15,600

4,880- 5,150

NA

NA

NA

No

NUT



7439-96-5

Manganese

15.8

362

ug/L

OWR-SW-05-0815

8/8



362

11.3-24

430 N

NA

NA

No

BSL



7440-02-0

Nickel

0.39 J

5.5 J

ug/L

OWR-SW-05-0815

8/8



5.5

0.4 J - 0.66 J

390 N

NA

NA

No

BSL



7440-09-7

Potassium

2,000

5,010

ug/L

OWR-SW-17-0815

8/8



5,010

2,600- 2,800

NA

NA

NA

No

NUT



7440-23-5

Sodium

6,710

26,000

ug/L

OWR-SW-06-0815

8/8



26,000

13,000- 13,800

NA

NA

NA

No

NUT



7440-28-0

Thallium

0.04 J

0.04 J

ug/L

OWR-SW-07-0815

1/8

1 - 1

0.04

ND

0.2 N

NA

NA

No

BSL



7440-66-6

Zinc

19.1 J +

36.1 J +

ug/L

OWR-SW-17-0815

6/8

o
o

36.1

10 J

6,000 N

NA

NA

No

BSL



Dissolved Inorganics



7429-90-5

Aluminum

3.3 J

36.2

ug/L

OWR-SW-07-0815

7/8

20-20

36.2

9.6 J - 12 J

20,000 N

NA

NA

No

BSL



7440-38-2

Arsenic

0.13 J

0.34 J

ug/L

OWR-SW-06-0815

8/8



0.34

0.22 J - 0.25 J

0.52 C

NA

NA

No

BSL



7440-39-3

Barium

38.2

91.2

ug/L

OWR-SW-17-0815

8/8



91.2

71.7-72.2

3,800 N

NA

NA

No

BSL



7440-70-2

Calcium

2,250

24,500

ug/L

OWR-SW-17-0815

8/8



24,500

5,610-5,860

NA

NA

NA

No

NUT



7440-47-3

Chromium

0.07 J

1.2 J

ug/L

OWR-SW16-20190408

9/10

2-2

1

0.12 J - 0.18 J

22,000 N(7)

NA

NA

No

BSL



7440-48-4

Cobalt

0.08 J

2.7

ug/L

OWR-SW-06-0815

8/8



2.7

0.05 J - 0.06 J

6 N

NA

NA

No

BSL



7440-50-8

Copper

0.85 J

1.6 J

ug/L

OWR-SW-07-0815

8/8



1.6

1.4 J - 1.5 J

800 N

NA

NA

No

BSL



7439-89-6

Iron

10.3 J

1,120

ug/L

OWR-SW-06-0815

8/8



1,120

19.1 J - 21.8 J

14,000 N

NA

NA

No

BSL



7439-95-4

Magnesium

2,230

13,500

ug/L

OWR-SW-17-0815

8/8



13,500

4,860- 5,390

NA

NA

NA

No

NUT



7439-96-5

Manganese

3.4

257

ug/L

OWR-SW-06-0815

8/8



257

4.1 - 8

430 N

NA

NA

No

BSL



7440-02-0

Nickel

0.2 J

1.7

ug/L

OWR-SW-06-0815

8/8



1.7

0.24 J - 0.3 J

390 N

NA

NA

No

BSL



7440-09-7

Potassium

1,880

5,130

ug/L

OWR-SW-17-0815

8/8



5,130

2,670- 2,900

NA

NA

NA

No

NUT



7440-23-5

Sodium

6,670

24,100

ug/L

OWR-SW-06-0815

8/8



24,100

13,200- 14,200

NA

NA

NA

No

NUT



7440-62-2

Vanadium

0.17 J

1.2 J

ug/L

OWR-SW-01-0815,
OWR-SW-17-0815

8/8



1.2

0.44 J - 0.47 J

86 N

NA

NA

No

BSL



7440-66-6

Zinc

5.8 J

15.7 J

ug/L

OWR-SW-07-0815

8/8



15.7

5.5 J - 8.3 J

6,000 N

NA

NA

No

BSL

Footnotes:

1	- Sample and duplicate are considered as two separate samples when determining the minimum and maximum concentrations.

2	- Values presented are sample-specific quantitation limits.

3	- The maximum detected concentration is used for screening purposes.

4	- Background data is presented for information purposes only and was not used in the selection of COPCs.

5	- The USEPA Regional Screening Level (May 2018) for tap water is presented. Value represents the tap water RSL multiplied by a factor of 10 for anticipated reduced

exposures to surface water. Before the factor is applied, the residential RSL for carcinogens corresponds to an incremental cancer risk of 1E-06 and for noncarcinogens
the RSL corresponds to a target hazard quotient of 0.1.

6	- The chemical is selected as a COPC if the maximum detected concentration exceeds the risk-based COPC screening level

8 - Hexavalent chromium was not detected in any surface water sample, therefore total chromium was evaluated as trivalent chromium.

Shaded criterion indicates that the maximum detected concentration exceeds one or more screening criteria. Shaded chemical name indicates that the

chemical was retained as a COPC.

Definitions:

ARAR/TBC = Applicable or Relevant and Appropriate Requirements To Be Considered
C = Carcinogen

COPC = Chemical Of Potential Concern
J = Estimated value

J+ = Analyte present but reported value may be biased high

N = Noncarcinogen

NA = Not Applicable/Not Available

ug/L = micrograms per liter

Rationale Codes:

For selection as a COPC:
ASL = Above Screening Level.

For elimination as a COPC:
BSL = Below COPC Screening Level
NUT = Essential nutrient
NTX = No toxicity criteria


-------
Scenario Timeframe: Current/Future
Medium: Sediment

Exposure Medium: Sediment	

TABLE 2.8

OCCURRENCE, DISTRIBUTION, AND SELECTION OF CHEMICALS OF POTENTIAL CONCERN - DIRECT CONTACT WITH SEDIMENT

OLD WILMINGTON ROAD SITE
PAGE 1 OF 1

Exposure Point

CAS
Number

Chemical

Minimum
Concentration'1'

Maximum
Concentration'1'

Units

Sample of Maximum
Concentration

Freguency
of

Detection

Range of
Detection
Limits'2'

Concentration
Used for
Screening'3'

Range of
Background
Concentrations'4'

Screening Toxicity

Value'5'

Potential

ARAR/TBC

Potential
ARAR/TBC
Source

COPC
Flag

Rationale for
Contaminant
Deletion or
Selection*6'

OWR

Volatile Organic Compounds |



75-34-3

1,1-Dichloroethane

2 J

6 J

uq/kq

OWR-S D06-061201

3/15

10-10

6

ND

36,000 C

NA

NA

No

BSL



75-15-0

Carbon Disulfide

2 J

2 J

ug/kg

OWR-SD14-061401,
OWR-S D20-061401

1/15

10-10

2

ND

770,000 N

NA

NA

No

BSL



75-00-3

Chloroethane

7 J

7 J

uq/kq

OWR-S D06-061201

1/15

10-10

7

ND

14,000,000 N

NA

NA

No

BSL



156-59-2

cis-1,2-Dichloroethylene

4 J

4 J

ug/kg

OWR-SD19-061201,
OWR-S D10-061301

2/15

10-10

4

ND

160,000 N

NA

NA

No

BSL



108-88-3

Toluene

3 J

24 J

uq/kq

OWR-S D06-061201

7/15

10-10

24

6 J - 7 J

4,900,000 N

NA

NA

No

BSL



79-01-6

Trichloroethene

2 J

2 J

uq/kq

OWR-S D19-061201

1/15

10-10

2

ND

4,100 N

NA

NA

No

BSL



Inorganics |



7429-90-5

Aluminum

4,430

20,800

mq/kq

OWR-SD10-061301

15/15

-

20,800

5,300- 11,700

77,000 N

NA

NA

No

BSL



7440-36-0

Antimony

0.99 JL

0.99 JL

mq/kq

OWR-SD14-061401

1/1

-

0.99

1.8 JL - 2.7 JL

31 N

NA

NA

No

BSL



7440-39-3

Barium

48.1 J

246

mq/kq

OWR-S D10-061301

15/15

-

246

87.8-181

15,000 N

NA

NA

No

BSL



7440-41-7

Beryllium

0.25 J

1.8 J

mq/kq

OWR-S D04-061201

15/15

-

1.8

0.54 J - 1 J

160 N

NA

NA

No

BSL



7440-43-9

Cadmium

1.7 J

1.7 J

mq/kq

OWR-SD15-061401

1/15

0.15-1.7

1.7

ND

71 N

NA

NA

No

BSL



7440-70-2

Calcium

540 J

7,700

mq/kq

OWR-S D01-061201

15/15

-

7,700

447 J- 1,050 J

NA

NA

NA

No

NUT



7440-47-3

Chromium

5.8

440

mg/kg

OWR-S D03-061201

17/17

-

440

6.3-14.7

120,000 N(7)

NA

NA

No

BSL



7440-48-4

Cobalt

1.5 J

34 J

mq/kq

OWR-SD04-061201

15/15

-

34

4.5 J- 10.6 J

23 N

NA

NA

Yes

ASL



7440-50-8

Copper

4.7 J

1,280

mq/kq

OWR-SDO3-061201

15/15

-

1,280

5.7 J-39

3,100 N

NA

NA

No

BSL



7439-89-6

Iron

3,330

28,600

mq/kq

OWR-SD02-061201

15/15

-

28,600

8,030-20,400

55,000 N

NA

NA

No

BSL



7439-92-1

Lead

12.5

166

mq/kq

OWR-S D13-061401

15/15

-

166

9.7-18.5

400

NA

NA

No

BSL



7439-95-4

Maqnesium

395 J

9,700

mq/kq

OWR-S D02-061201

15/15

-

9,700

779 J- 1,890 J

NA

NA

NA

No

NUT



7439-96-5

Manqanese

85.6

1,030

mq/kq

OWR-SD04-061201

15/15

-

1,030

186-675

1,800 N

NA

NA

No

BSL



7439-97-6

Mercury

2.8

2.8

mq/kq

OWR-SD06-061201

1/15

o
o

2.8

ND

11 N

NA

NA

No

BSL



7440-02-0

Nickel

3.9 J

3,070

mq/kq

OWR-SD03-061201

14/15

6.3-6.3

3,070

9 J - 19 J

1,500 N

NA

NA



ASL



7440-09-7

Potassium

516 J

2,650 J

mq/kq

OWR-SD 10-061301

15/15

-

2,650

1,550 J-2,660 J

NA

NA

NA

No

NUT



7782-49-2

Selenium

2.4 JK

3.5 L

mq/kq

OWR-S D17-061801

2/15

1 - 1

3.5

ND

390 N

NA

NA

No

BSL



7440-22-4

Silver

0.34 J

0.67 J

mq/kq

OWR-S D02-061201

7/15

2-2

0.67

0.48 J-0.75 J

390 N

NA

NA

No

BSL



7440-62-2

Vanadium

8.4 J

62.2

mq/kq

OWR-SD02-061201

15/15

-

62.2

8.5 J-21.2 J

390 N

NA

NA

No

BSL



7440-66-6

Zinc

28.9

3,980

mq/kq

OWR-SD 15-061401

15/15

-

3,980

27.6-60.9

23,000 N

NA

NA

No

BSL

Footnotes:

1	- Sample and duplicate are considered as two separate samples when determining the minimum and maximum concentrations.

2	- Values presented are sample-specific quantitation limits.

3	- The maximum detected concentration is used for screening purposes.

4	- Background values are present for information purposes only and were not used for COPC selection.

5	- The USEPA Regional Screening Level (May 2018) for residential exposures to soil is presented. Value represents the residential RSL multiplied by a factor of 10 for

anticipated reduced exposures to sediment. Before the factor is applied, the residential RSL for carcinogens corresponds to an incremental cancer risk of 1E-06 and
for noncarcinogens the RSL corresponds to a target hazard quotient of 0.1.

6	- The chemical is selected as a COPC if the maximum detected concentration exceeds the risk-based COPC screening level.

7	- Hexavalent chromium was not detected in any sediment sample, therefore total chromium was evaluated as trivalent chromium.

Shaded criterion indicates that the maximum detected concentration exceeds one or more screening criteria. Shaded chemical name indicates that the
chemical was retained as a COPC.

Definitions:

ARAR/TBC = Applicable or Relevant and Appropriate Requirements To Be Considered
C = Carcinogen

COPC = Chemical Of Potential Concern
J = Estimated value

K = Analyte present. Reported value may be biased high. Actual values is expected to be lower

L = Analyte present. Reported value may be biased low.

mg/kg = milligrams per kilogram

N = Noncarcinogen

NA = Not Applicable/Not Available

ug/kg = micrograms per kilogram

Rationale Codes:

For selection as a COPC:

ASL = Above Screening Level.

For elimination as a COPC:
BSL = Below COPC Screening Level
NUT = Essential nutrient


-------
RAGS Part D Table 3
Medium-Specific Exposure Point Concentration Summary


-------
LIST OF TABLES
RAGS PART D TABLE 3
MEDIUM-SPECIFIC EXPOSURE POINT CONCENTRATION SUMMARY

Table No.

Surface Soil

Combined Surface/Subsurface Soil
Groundwater - Industrial Workers and Residents
Groundwater - Construction Workers
Sediment

3.1.RME

3.2.RME

3.3.RME

3.4.RME

3.5.RME


-------
TABLE 3.1.RME
EXPOSURE POINT CONCENTRATION SUMMARY
REASONABLE MAXIMUM EXPOSURE
OLD WILMINGTON ROAD SITE

Scenario Timeframe: Current
ledium: Surface Soil
xposure Medium: Surface Soil

Exposure Point

Chemical of
Potential Concern

Units

Arithmetic
Mean

95% UCL
(Distribution)

Maximum
Concentration
(Qualifier)

Exposure Point Concentration

Value

Units

Statistic

Rationale

OWR

Benzo(a)pyrene

mg/kg

0.195

0.286 (N)

0.82

0.286

mg/kg

95% KM (t) UCL

ProUCL 5.1.002

Naphthalene

mg/kg

0.672

(1)

9.8

9.8

mg/kg

Maximum Detected Concentration

(1)

Dieldrin

mg/kg

0.008

(1)

0.11

0.11

mg/kg

Maximum Detected Concentration

(1)

Aluminum

mg/kg

10,577

12,000 (N)

16100

12,000

mg/kg

95% Modified-t UCL

ProUCL 5.1.002

Antimony

mg/kg

5.28

11.3 (NP)

37.1 L

11.3

mg/kg

95% KM (Chebyshev) UCL

ProUCL 5.1.002

Arsenic

mg/kg

4.67

5.28 (N)

8.1

5.28

mg/kg

95% Student's-t UCL

ProUCL 5.1.002

Cobalt

mg/kg

6.09

7.59 (G)

14.1

7.59

mg/kg

95% Adjusted Gamma UCL

ProUCL 5.1.002

Copper

mg/kg

257

1,240 (NP)

4,530 J

1,240

mg/kg

95% Chebyshev (Mean, Sd) UCL

ProUCL 5.1.002

Iron

mg/kg

16,329

20,200 (AN)

49,400

20,200

mg/kg

95% Student's-t UCL

ProUCL 5.1.002

Lead

mg/kg

131

484 (NP)

1,650 L

131

mg/kg

Arithmetic Mean Concentration

(2)

Manganese

mg/kg

387

456 (N)

632

456

mg/kg

95% Student's-t UCL

ProUCL 5.1.002

Vanadium

mg/kg

23.4

27.0 (N)

44.6

27.0

mg/kg

95% Student's-t UCL

ProUCL 5.1.002

Zinc

mg/kg

185

705 (NP)

2450

705

mg/kg

95% Chebyshev (Mean, Sd) UCL

ProUCL 5.1.002

Definitions:	Qualifiers:

AN = Approximate normal distribution.	J = Estimated value.

G = Gamma distribution.	L = Analyte present. Reported value may be biased low.

N = Normal distribution.

NP = Non-parametric distribution.

mg/kg = milligrams per kilogram

1	- There are less than three detected concentrations. Reliable statistics cannot be computed. The maximum concentration was used as the EPC.

2	- Mean concentration is used as exposure point concentration for evaluating exposures to lead.

U.S. EPA, 1994:Guidance Manual for the Integrated Exposure Uptake Biokinetic Model for lead in Children.

Exposure point concentrations for the RME scenarios are also the exposure point concentrations for the CTE scenarios.


-------
TABLE 3.2.RME
EXPOSURE POINT CONCENTRATION SUMMARY
REASONABLE MAXIMUM EXPOSURE
OLD WILMINGTON ROAD SITE

Scenario Timeframe: Future
Medium: Surface/Subsurface Soil
Exposure Medium: Surface/Subsurface Soil

Exposure Point

Chemical of
Potential Concern

Units

Arithmetic
Mean

95% UCL
(Distribution)

Maximum
Concentration
(Qualifier)

Exposure Point Concentration

Value

Units

Statistic

Rationale

OWR

Benzo(a)pyrene

mg/kg

0.180

0.252 (N)

0.82

0.252

mg/kg

95% KM (t) UCL

ProUCL 5.1.002

Naphthalene

mg/kg

0.425

(1)

9.8

9.8

mg/kg

Maximum Detected Concentration

(1)

Dieldrin

mg/kg

0.005

(1)

0.11

0.11

mg/kg

Maximum Detected Concentration

(1)

Aluminum

mg/kg

8499

9,940 (AN)

21,500

9940

mg/kg

95% Student's-t UCL

ProUCL 5.1.002

Antimony

mg/kg

5.08

6.48 (NP)

37.1 L

6.48

mg/kg

95% KM (Chebyshev) UCL

ProUCL 5.1.002

Arsenic

mg/kg

3.18

3.95 (N)

8.1

3.95

mg/kg

95% KM (t) UCL
95% GROS Adjusted Gamma UCL

ProUCL 5.1.002

Cobalt

mg/kg

5.08

6.32 (G)

17.6

6.32

mg/kg

ProUCL 5.1.002

Copper

mg/kg

141

660 (NP)

4,530 J

660

mg/kg

95% Chebyshev (Mean, Sd) UCL

ProUCL 5.1.002

Iron

mg/kg

16220

19,200 (AN)

49,400

19,200

mg/kg

95% Student's-t UCL

ProUCL 5.1.002

Lead

mg/kg

71.4

260 (L)

1,650 L

71.4

mg/kg

Arithmetic Mean Concentration

(2)

Manganese

mg/kg

232

388 (NP)

632

388

mg/kg

95% KM (Chebyshev) UCL

ProUCL 5.1.002

Thallium

mg/kg

1.47

2 13 (AL)

5.6

2.13

mg/kg

KM Student's t

ProUCL 5.1.002

Vanadium

mg/kg

20.2

23.6 (N)

52.4

23.6

mg/kg

95% Student's-t UCL

ProUCL 5.1.002

Zinc

mg/kg

102

380 (NP)

2,450

380

mg/kg

95% KM (Chebyshev) UCL

ProUCL 5.1.002

Definitions:	Qualifiers:

AN = Approximate normal distribution.	J = Estimated value.

G = Gamma distribution.	L = Analyte present. Reported value may be biased low.

L = Lognormal distribution.

N = Normal distribution.

NP = Non-parametric distribution.

mg/kg = milligrams per kilogram

1	- There are less than three detected concentrations. Reliable statistics cannot be computed. The maximum concentration was used as the EPC.

2	- Mean concentration is used as exposure point concentration for evaluating exposures to lead.

U.S. EPA, 1994:Guidance Manual for the Integrated Exposure Uptake Biokinetic Model for lead in Children.

Exposure point concentrations for the RME scenarios are also the exposure point concentrations for the CTE scenarios.


-------
TABLE 3.3.RME

EXPOSURE POINT CONCENTRATION SUMMARY FOR INDUSTRIAL WORKERS AND RESIDENTS
REASONABLE MAXIMUM EXPOSURE
OLD WILMINGTON ROAD SITE

Scenario timeframe: Current/Future
Medium: Groundwater
Exposure Medium: Groundwater

Exposure Point

Chemical of

Units

Arithmetic

95% UCL

Maximum
Concentration

Exposure Point Concentration



Potential Concern



Mean

(Distribution)

(Qualifier)

Value

Units

Statistic

Rationale

OWR

2-Butanone

ug/L

(D

(1)

1,300

1,300

ug/L

Maximum Detected Concentration

(1)



2-Hexanone

ug/L

(2)

(2)

41

41

ug/L

Maximum Detected Concentration

(2)



Chloroform

ug/L

(2)

(2)

9.4

9.4

ug/L

Maximum Detected Concentration

(2)



cis-1,2-Dichloroethene

ug/L

2.53

1.88 (NP)

6.6

1.88

ug/L

95% KM Chebyshev UCL

ProUCL 5.1.002



Methyl Tert-Butyl Ether

ug/L

(3)

(3)

15

15

ug/L

Maximum Detected Concentration

(3)



Tetrachloroethene

ug/L

35.2

65.7 (G)

190

65.7

ug/L

95% Gamma Adjusted KM-UCL

ProUCL 5.1.002



Trichloroethene

ug/L

6.07

10.6 (AL)

27

10.6

ug/L

95% KM Chebyshev UCL

ProUCL 5.1.002



Vinyl Chloride

ug/L

(2)

(2)

0.57

0.57

ug/L

Maximum Detected Concentration

(2)



1,4-Dioxane

ug/L

3.81

3.84 (G)

20 J

3.84

ug/L

95% KM Adjusted Gamma UCL

ProUCL 5.1.002



Bis(2-ethylhexyl)phthalate

ug/L

(D

(1)

11

11

ug/L

Maximum Detected Concentration

(1)



Caprolactam

ug/L

(2)

(2)

2,800

2,800

ug/L

Maximum Detected Concentration

(2)



Aluminum

ug/L

17,926

57,655 (NP)

301,000

57,655

ug/L

97.5% KM (Chebyshev) UCL

ProUCL 5.1.002



Antimony

ug/L

1.19

1.31 (G)

10.2 J

1.31

ug/L

95% KM Approximate Gamma UCL

ProUCL 5.1.002



Arsenic

ug/L

5.63

12.8 (AL)

60.1

12.8

ug/L

95% KM (Chebyshev) UCL

ProUCL 5.1.002



Barium

ug/L

315

674 (NP)

3,310

674

ug/L

95% KM (Chebyshev) UCL

ProUCL 5.1.002



Beryllium

ug/L

2.42

3.46 (AN)

17.8

3.46

ug/L

95% KM (t) UCL

ProUCL 5.1.002



Cadmium

ug/L

0.554

0.424 (NP)

1.5

0.424

ug/L

95% KM (Chebyshev) UCL

ProUCL 5.1.002



Cobalt

ug/L

19.8

63.9 (L)

232

63.9

ug/L

KM H-UCL

ProUCL 5.1.002



Copper

ug/L

20.4

75.2 (AL)

739

75.2

ug/L

95% KM Chebyshev UCL

ProUCL 5.1.002



Iron

ug/L

15,927

45,400 (L)

380,000 J

45,400

ug/L

95% KM Chebyshev UCL

ProUCL 5.1.002



Lead

ug/L

23.1

53.5 (AL)

217

23.1

ug/L

Arithmetic Mean Concentration

ProUCL 5.1.002



Manganese

ug/L

1,175

2,525 (L)

10,900

2,525

ug/L

95% Chebyshev(Mean, Sd) UCL

ProUCL 5.1.002



Mercury

ug/L

0.122

0.128 (N)

0.23

0.128

ug/L

95% KM (t) UCL

ProUCL 5.1.002



Nickel

ug/L

17.8

51.7 (L)

368

51.7

ug/L

95% KM Chebyshev UCL

ProUCL 5.1.002



Selenium

ug/L

2.88

3.10 (AL)

15.2

3.1

ug/L

95% KM Chebyshev UCL

ProUCL 5.1.002



Thallium

ug/L

0.388

0.539 (AN)

2.3

0.539

ug/L

95% KM (t) UCL

ProUCL 5.1.002



Vanadium

ug/L

7.59

12.3 (AG)

93.6

12.3

ug/L

95% KM Approximate Gamma UCL

ProUCL 5.1.002



Zinc

ug/L

147

378 (NP)

2,020

378

ug/L

95% KM Chebyshev UCL

ProUCL 5.1.002

Definitions:	Qualifiers:

AG = Approximate gamma distribution.	J = Estimated value.

AL = Approximate lognormal distribution.

AN = Approximate Normal distribution.

G = Gamma distribution.

L = Lognormal distribution.

N = Normal distribution.

NP = Nonparametric distribution.

ug/L = Micrograms per liter.

1	- 2-Butanone, bis(2-ethylhexyl)phthalate, and caprolactam were detected at low frequency of detections and there is no descernable plume for these chemicals, therefore the maximum detected

was used as the EPC for these chemicals.

2	- There were an insufficient number of detected concentrations to calculate an EPC for 2-hexanone, chloroform, and vinyl chloride, therefore the maximum detected concentration was used

as the EPC for these chemicals.

3	- While methyl tert-butyl ether was detected in two thirds of the samples, it is difficult to define a plume area, therefore the maximum detected concentration was used as the EPC

for methyl tert-butyl ether.

Exposure point concentrations for the RME scenarios are also the exposure point concentrations for the CTE scenarios.


-------
TABLE 3.4.RME

EXPOSURE POINT CONCENTRATION SUMMARY FOR CONSTRUCTION WORKERS
REASONABLE MAXIMUM EXPOSURE
OLD WILMINGTON ROAD SITE

[Scenario Timeframe: Current/Future
Medium: Groundwater
[Exposure Medium: Groundwater

Exposure Point

Chemical of

Units

Arithmetic

95% UCL

Maximum
Concentration

Exposure Point Concentration



Potential Concern



Mean

(Distribution)

(Qualifier)

Value

Units

Statistic

Rationale

OWR

2-Butanone

ug/L

(1)

(1)

2 J

2

ug/L

OWR-MW23-PORT1-0117

(1)



cis-1,2-Dichloroethene

ug/L

(1)

(1)

3.1

3.1

ug/L

OWR-MW08S-0117

(1)



Methyl tert-butyl ether

ug/L

(1)

(1)

0.95

0.95

ug/L

OWR-MW23-PORT1-0117

(1)



Trichloroethene

ug/L

(1)

(1)

27

27

ug/L

OWR-MW-08S-0816-RS

(1)



1,4-Dioxane

ug/L

(1)

(1)

3.8 J

3.8

ug/L

OWR-MW08S-0816

(1)



Caprolactam

ug/L

(1)

(1)

3.7 J

3.7

ug/L

OWR-MW23-PORT1-0117

(1)



Aluminum

ug/L

(1)

(1)

114,000

114,000

ug/L

OWR-MW23-PORT2-0816

(1)



Antimony

ug/L

(1)

(1)

0.46 J

0.46

ug/L

OWR-MW23-PORT1-0117

(1)



Arsenic

ug/L

(1)

(1)

60.1

60.1

ug/L

OWR-MW23-PORT2-0117

(1)



Barium

ug/L

(1)

(1)

3,310

3,310

ug/L

OWR-MW23-PORT3-0816

(1)



Beryllium

ug/L

(1)

(1)

17.8

17.8

ug/L

OWR-MW23-PORT2-0117

(1)



Cadmium

ug/L

(1)

(1)

0.45 J

0.45

ug/L

OWR-MW23-PORT2-0117

(1)



Cobalt

ug/L

(1)

(1)

12.2

12.2

ug/L

OWR-MW-08S-0815

(1)



Copper

ug/L

(1)

(1)

39.9

39.9

ug/L

OWR-MW23-PORT2-0117

(1)



Iron

ug/L

(1)

(1)

74,900 J

74,900

ug/L

OWR-MW23-PORT2-0117

(1)



Lead

ug/L

(1)

(1)

206

206

ug/L

OWR-MW23-PORT2-0117

(1)



Manganese

ug/L

(1)

(1)

1,020 J

1,020

ug/L

OWR-MW23-PORT2-0117

(1)



Mercury

ug/L

(1)

(1)

0.091 J

0.091

ug/L

OWR-MW23-PORT2-0117

(1)



Nickel

ug/L

(1)

(1)

15.8

15.8

ug/L

OWR-MW23-PORT2-0117

(1)



Selenium

ug/L

(1)

(1)

1.6 J

1.6

ug/L

OWR-MW23-PORT2-0816

(1)



Thallium

ug/L

(1)

(1)

2.3

2.3

ug/L

OWR-MW23-PORT2-0117

(1)



Vanadium

ug/L

(1)

(1)

30.5 J

30.5

ug/L

OWR-MW23-PORT2-0117

(1)



Zinc

ug/L

(1)

(1)

343

343

ug/L

OWR-MW23-PORT2-0117

(1)

1 - The maximum groundwater concentration at monitoring wells OWR-MW08S, OWR-MW08D, and OWR-MW23 is used as the exposure point concentration for construction workers.

Exposure point concentrations for the RME scenarios are also the exposure point concentrations for the CTE scenarios.


-------
TABLE 3.5.RME
EXPOSURE POINT CONCENTRATION SUMMARY
REASONABLE MAXIMUM EXPOSURE
OLD WILMINGTON ROAD SITE

[Scenario Timeframe: Current/Future

Medium: Sediment

[Exposure Medium: Sediment	

Exposure Point

Chemical of
Potential Concern

Units

Arithmetic
Mean

95% UCL
(Distribution)

Maximum
Concentration
(Qualifier)

Exposure Point Concentration

Value

Units

Statistic

Rationale

OWR

Cobalt

mg/kg

10.2

14.0 (AN)

34 J

14.0

mg/kg

95% Student's-t UCL

ProUCL 5.1.002

Nickel

mg/kg

218

1,500 (NP)

3,070

1,500

mg/kg

97.5% KM (Chebyshev) UCL

ProUCL 5.1.002

Definitions:	Qualifiers:

AN = Approximate Normal	J = Estimated value

L = Lognormal

NP= Non-pa ra metric

mg/kg = milligrams per kilogram

Exposure point concentrations for the RME scenarios are also the exposure point concentrations for the CTE scenarios.


-------
RAGS Part D Table 4
Values Used For Daily Intake Calculations


-------
LIST OF TABLES
RAGS PART D TABLE 4
VALUES USED FOR DAILY INTAKE CALCULATIONS

Table No.

Reasonable Maximum Exposures

4.1 .RME	Construction Workers Exposed to Soil

4.2.RME	Construction Workers Exposed to Air Emissions from Soil

4.3.RME	Construction Workers Exposed to Groundwater

4.4.RME	Construction Workers Exposed to Volatile Emissions from Groundwater

4.5.RME	Industrial Workers Exposed to Soil

4.6.RME	Industrial Workers Exposed to Air Emissions from Soil

4.7.RME	Indistrial Workers Exposed to Groundwater

4.8.RME	Industrial Workers Exposed to Volatiles While Showering

4.9.RME	Child Residents Exposed to Soil

4.10.RME	Child Residents Exposed to Air Emissions from Soil
4.11 RME	Child Residents Exposed to Groundwater

4.12.RME	Child Residents Exposed to Sediment

4.13.RME	Adult Residents Exposed to Soil

4.14.RME	Adult Residents Exposed to Air Emissions from Soil

4.15.RME	Adult Residents Exposed to Groundwater

4.16.RME	Adult Residents Exposed to Volatiles While Showering

4.17.RME	Adult Residents Exposed to Sediment

Central Tendency Exposures

4.1 .CTE	Construction Workers Exposed to Soil

4.2.CTE	Construction Workers Exposed to Air Emissions from Soil

4.3.CTE	Construction Workers Exposed to Groundwater

4.4.CTE	Construction Workers Exposed to Volatile Emissions from Groundwater

4.5.CTE	Industrial Workers Exposed to Soil

4.6.CTE	Industrial Workers Exposed to Air Emissions from Soil

4.7.CTE	Indistrial Workers Exposed to Groundwater

4.8.CTE	Industrial Workers Exposed to Volatiles While Showering

4.9.CTE	Child Residents Exposed to Soil

4.10.CTE	Child Residents Exposed to Air Emissions from Soil
4.11 .CTE	Child Residents Exposed to Groundwater

4.12.CTE	Child Residents Exposed to Sediment

4.13.CTE	Adult Residents Exposed to Soil

4.14.CTE	Adult Residents Exposed to Air Emissions from Soil

4.15.CTE	Adult Residents Exposed to Groundwater

4.16.CTE	Adult Residents Exposed to Volatiles While Showering

4.17.CTE	Adult Residents Exposed to Sediment


-------
TABLE 4.1.RME
VALUES USED FOR DAILY INTAKE CALCULATIONS
REASONABLE MAXIMUM EXPOSURE - CONSTRUCTION WORKERS- SOILS
OLD WILMINGTON ROAD SITE

Scenario Timeframe: Future
Medium: Surface Soil/Subsurface Soil
Exposure Medium: Surface/Subsurface Soil

Exposure Route

Receptor Population

Receptor Age

Exposure Point

Parameter

Parameter Definition

Value

Units

Rationale/

Intake Equation/









Code







Reference

Model Name

Ingestion

Construction Workers

Adult

Old Wilmington Road

CS

Chemical concentration in soil

Max or 95% UCL

mg/kg

USEPA, 2002a

Intake (mg/kg/day) =









IR-S

Ingestion Rate

330

mg/day

USEPA, 2002b











RBA

Relative Bioavailability

Chemical Specific

unitless

USEPA, 1989

Cs x RBA x IRS x CF3 x Fl x EF x ED









CF3

Conversion Factor 3

1.0E-06

kg/mg

-

BWx AT









Fl

Fraction Ingested

1

unitless

USEPA, 2002b











EF

Exposure Frequency

250

days/year

(1)











ED

Exposure Duration

1

years

(1)











BW

Body Weight

80

kg

USEPA, 2014











AT-C

Averaging Time (Cancer)

25,550

days

USEPA, 2014











AT-N

Averaging Time (Non-Cancer)

365

days

USEPA, 2014



Dermal

Construction Workers

Adult

Old Wilmington Road

CS

Chemical concentration in soil

Max or 95% UCL

mg/kg

USEPA, 2002a

Dermally Absorbed Dose (mg/kg/day) =









CF3

Conversion Factor 3

1.0E-06

kg/mg

-











SA

Skin Surface Available for Contact

3,527

cm2

USEPA, 2014

CS x CF3 x SA x SSAF x DABS x EV x EF x ED









SSAF

Soil to Skin Adherence Factor

0.3

mg/cm2/event

USEPA, 2002b

BW xAT









DABS

Absorption Factor

Chemical Specific

unitless

USEPA, 2004











EV

Events Frequency

1

events/day

USEPA, 2004











EF

Exposure Frequency

250

days/year

(1)











ED

Exposure Duration

1

years

(1)











BW

Body Weight

80

kg

USEPA, 2014











AT-C

Averaging Time (Cancer)

25,550

days

USEPA, 2014











AT-N

Averaging Time (Non-Cancer)

365

days

USEPA, 2014



Notes:

1 - Professional judgment.

Sources:

USEPA, 1989: Risk Assessment Guidance for Superfund. Vol 1: Human Health Evaluation Manual, Part A.

USEPA, 2002a:Calculating Upper Confidence Limits for Exposure Point Concentrations at Hazardous Waste Sites. OSWER 9285.6-10, December.
USEPA, 2002b: Supplemental Guidance for Developing Soil Screening Levels for Superfund Sites. OSWER 9355.4-24.

USEPA, 2004: Risk Assessment Guidance for Superfund (Part E, Supplemental Guidance for Dermal Risk Assessment) Final. EPA/540/R/99/005.
USEPA, 2014: Human Health Evaluation Manual, Supplemental Guidance: Update of Standard Default Exposure Factors. OSWER 9200.1-120.


-------
TABLE 4.2.RME
VALUES USED FOR DAILY INTAKE CALCULATIONS
REASONABLE MAXIMUM EXPOSURE - CONSTRUCTION WORKERS - SOILS TO AIR
OLD WILMINGTON ROAD SITE

Scenario Timeframe: Future
Medium: Surface Soil/Subsurface Soil
Exposure Medium: Air

Exposure Route

Receptor Population

Receptor Age

Exposure Point

Parameter
Code

Parameter Definition

Value

Units

Rationale/
Reference

Intake Equation/
Model Name

Inhalation

Construction Workers

Adult

Old Wilmington Road

CA

Chemical concentration in air

Calculated

mg/m3

USEPA, 2002a

Exposure Concentration (mg/m3) =









CS

Chemical concentration in soil

Max or 95% UCL

mg/kg

USEPA, 2002b











ET

Exposure Time

8

hours/day

(1)

CAx ET x EF x ED









EF

Exposure Frequency

250

days/year

(1)

AT x 24 hours/day









ED

Exposure Duration

1

years

(1)











AT-C

Averaging Time (Cancer)

25,550

days

USEPA, 2014

CA= (1/PEF + 1 /VF) x Cs









AT-N

Averaging Time (Non-Cancer)

365

days

USEPA, 2014











PEF

Particulate Emission Factor

1.40E+06

m3/kg

USEPA, 2002a











VF

Volatilization Factor

Chemical-specific

m3/kg

USEPA, 2002a











Q/C

Inverse of mean concentration at

14.31

g/m2-s per

USEPA, 2002a













center of source



kg/m3





Notes:

1 - Professional judgment.

Sources:

USEPA, 2002a: Supplemental Guidance for Developing Soil Screening Levels for Superfund Sites. OSWER 9355.4-24.

USEPA, 2002b:Calculating Upper Confidence Limits for Exposure Point Concentrations at Hazardous Waste Sites. OSWER 9285.6-10, December.
USEPA, 2014: Human Health Evaluation Manual, Supplemental Guidance: Update of Standard Default Exposure Factors. OSWER 9200.1-120.


-------
TABLE 4.3.RME
VALUES USED FOR DAILY INTAKE CALCULATIONS
REASONABLE MAXIMUM EXPOSURE - CONSTRUCTION WORKERS - GROUNDWATER
OLD WILMINGTON ROAD SITE

Scenario Timeframe: Future
Medium: Groundwater
Exposure Medium: Groundwater

Exposure Route

Receptor Population

Receptor Age

Exposure Point

Parameter

Parameter Definition

Value

Units

Rationale/

Intake Equation/









Code







Reference

Model Name

Ingestion

Construction Workers

Adult

Old Wilmington Road

CGW

Chemical Concentration in Groundwater

Max or 95% UCL

ug/L

USEPA, 2014a

Chronic Daily Intake (CDI) (mg/kg/day) =









CF

Conversion Factor

0.001

mg/ug

-











IR-GW

Ingestion Rate of Groundwater

0.05

L/day

(1)

CGW x CF x IR-GW x EF x ED









EF

Exposure Frequency

30

days/year

(1)

BWx AT









ED

Exposure Duration

1

years

(1)











BW

Body Weight

80

kg

USEPA, 2014b











AT-C

Averaging Time (Cancer)

25,550

days

USEPA, 2014b











AT-N

Averaging Time (Non-Cancer)

365

days

USEPA, 2014b



Dermal

Construction Workers

Adult

Old Wilmington Road

Daevent

Dermally Absorbed Dose per Event

Calculated

mg/cm2-event

USEPA, 2004

Dermally Absorbed Dose (mg/kg/day) =









Cw

Chemical Concentration in Groundwater

Max or 95% UCL

ug/L

USEPA, 2014a











FA

Fraction Absorbed

Chemical Specific

unitless

USEPA, 2004

DAevent x EV x EF x ED x SA









CF

Conversion factor

0.001

L/cm3

--

BWx AT









Kp

Permeability coefficient

Chemical Specific

cm/hr

USEPA, 2004











T

Lag time

Chemical Specific

hr/event

USEPA, 2004

For inorganics









t*

Time it takes to reach steady state

Chemical Specific

hr/event

USEPA, 2004

DAevent = Kp x CW x CF x tevent









tevent

Duration of event

8

hr/event

(1)











B

Bunge model constant

Chemical Specific

unitless

USEPA, 2004

For organics if tevent <= t*









SA

Skin Surface Available for Contact

3,527

cm2

USEPA, 2014b

DAevent= 2 x FA x Kp x Cw x CF x sqrt[(6 x x x teventypi]









EV

Event Frequency

1

events/day

(1)











EF

Exposure Frequency

30

days/year

(1)

For organics if tevent > t*









ED

Exposure Duration

1

years

(1)

DAevent =FAx Kpx Cwx CFx [tevent/(1+B) +









BW

Body Weight

80

kg

USEPA, 2014b

2 x t +(1 + 3B + 3B2)/(1+B2)









AT-C

Averaging Time (Cancer)

25,550

days

USEPA, 2014b











AT-N

Averaging Time (Non-Cancer)

365

days

USEPA, 2014b



Notes:

1 - Professional judgment.

USEPA, 2004: Risk Assessment Guidance for Superfund (Part E, Supplemental Guidance for Dermal Risk Assessment) Final. EPA/540/R/99/005.
USEPA, 2014a: Determining Groundwater Exposure Point Concentrations. OSWER 9283.1-42

USEPA, 2014b: Human Health Evaluation Manual, Supplemental Guidance: Update of Standard Default Exposure Factors. OSWER 9200.1-120.


-------
TABLE 4.4.RME
VALUES USED FOR DAILY INTAKE CALCULATIONS
REASONABLE MAXIMUM EXPOSURE - CONSTRUCTION WORKERS - GROUNDWATER TO AIR
OLD WILMINGTON ROAD SITE

Scenario Timeframe: Future
Medium: Groundwater
Exposure Medium: Air	

Exposure Route

Receptor Population

Receptor Age

Exposure Point

Parameter

Parameter Definition

Value

Units

Rationale/

Intake Equation/









Code







Reference

Model Name

Inhalation

Construction Workers

Adult

Old Wilmington Road

CA

Chemical concentration in air

Calculated

mg/m3

VDEQ, 2018

Exposure Concentration (mg/m3) =









CW

Chemical concentration in water.

Max or 95% UCL

ug/L

USEPA, 2014a











CF

Conversion Factor

0.001

mg/ug

-

CA x ET x EF x ED









ET

Exposure Time

8

hours/day

(1)

AT x 24 hours/day









EF

Exposure Frequency

30

days/year

(1)











ED

Exposure Duration

1

years

(1)

CA = CW x CF x VF









AT-C

Averaging Time (Cancer)

25,550

days

USEPA, 2014b











AT-N

Averaging Time (Non-Cancer)

365

days

USEPA, 2014b











VF

Volatilization Factor

Calculated

(mg/m3)/(mg/L)

VDEQ, 2018



Notes:

1 - Professional judgment.

USEPA, 2014a: Determining Groundwater Exposure Point Concentrations. OSWER 9283.1-42

USEPA, 2014b: Human Health Evaluation Manual, Supplemental Guidance: Update of Standard Default Exposure Factors. OSWER 9200.1-120.
VDEQ, 2018: Virginia Unified Risk Assessment Model - VURAM 2.0 User's Guide.


-------
TABLE 4.5.RME
VALUES USED FOR DAILY INTAKE CALCULATIONS
REASONABLE MAXIMUM EXPOSURE - INDUSTRIAL WORKERS - SOIL
OLD WILMINGTON ROAD SITE

Scenario Timeframe: Current/Future
Medium: Surface Soil/Subsurface Soil
Exposure Medium: Surface/Subsurface Soil

Exposure Route

Receptor Population

Receptor Age

Exposure Point

Parameter

Parameter Definition

Value

Units

Rationale/

Intake Equation/









Code







Reference

Model Name

Ingestion

Industrial Workers

Adult

Old Wilmington Road

CS

Chemical concentration in soil

Max or 95% UCL

mg/kg

USEPA, 2002

Intake (mg/kg/day) =









IR-S

Ingestion Rate

100

mg/day

USEPA, 2014











RBA

Relative Bioavailability

Chemical Specific

unitless

USEPA, 1989

Cs x RBA x IRS x CF3 x Fl x EF x ED









CF3

Conversion Factor 3

1.0E-06

kg/mg

-

BWx AT









Fl

Fraction Ingested

1

unitless

USEPA, 2014











EF

Exposure Frequency

250

days/year

USEPA, 2014











ED

Exposure Duration

25

years

USEPA, 2014











BW

Body Weight

80

kg

USEPA, 2014











AT-C

Averaging Time (Cancer)

25,550

days

USEPA, 2014











AT-N

Averaging Time (Non-Cancer)

9,125

days

USEPA, 2014



Dermal

Industrial Workers

Adult

Old Wilmington Road

CS

Chemical concentration in soil

Max or 95% UCL

mg/kg

USEPA, 2002

Dermally Absorbed Dose (mg/kg/day) =









CF3

Conversion Factor 3

1.0E-06

kg/mg

-











SA

Skin Surface Available for Contact

3,527

cm2

USEPA, 2014

CS x CF3 x SA x SSAF x DABS x EV x EF x ED









SSAF

Soil to Skin Adherence Factor

0.12

mg/cm2/event

USEPA, 2014

BWx AT









DABS

Absorption Factor

Chemical Specific

unitless

USEPA, 2004











EV

Events Frequency

1

events/day

USEPA, 2004











EF

Exposure Frequency

250

days/year

USEPA, 2014











ED

Exposure Duration

25

years

USEPA, 2014











BW

Body Weight

80

kg

USEPA, 2014











AT-C

Averaging Time (Cancer)

25,550

days

USEPA, 2014











AT-N

Averaging Time (Non-Cancer)

9,125

days

USEPA, 2014



Sources:

USEPA, 1989: Risk Assessment Guidance for Superfund. Vol 1: Human Health Evaluation Manual, Part A.

USEPA, 2002:Calculating Upper Confidence Limits for Exposure Point Concentrations at Hazardous Waste Sites. OSWER 9285.6-10, December.
USEPA, 2004: Risk Assessment Guidance for Superfund (Part E, Supplemental Guidance for Dermal Risk Assessment) Final. EPA/540/R/99/005.
USEPA, 2014: Human Health Evaluation Manual, Supplemental Guidance: Update of Standard Default Exposure Factors. OSWER 9200.1-120.


-------
TABLE 4.6.RME
VALUES USED FOR DAILY INTAKE CALCULATIONS
REASONABLE MAXIMUM EXPOSURE - INDUSTRIAL WORKERS - SOIL TO AIR
OLD WILMINGTON ROAD SITE

Scenario Timeframe: Current/Future
Medium: Surface Soil/Subsurface Soil
Exposure Medium: Air

Exposure Route

Receptor Population

Receptor Age

Exposure Point

Parameter
Code

Parameter Definition

Value

Units

Rationale/
Reference

Intake Equation/
Model Name

Inhalation

Industrial Workers

Adult

Old Wilmington Road

CA

Chemical concentration in air

Calculated

mg/m3

USEPA, 2002a

Exposure Concentration (mg/m3) =









CS

Chemical concentration in soil

Max or 95% UCL

mg/kg

USEPA, 2002b











ET

Exposure Time

8

hours/day

USEPA, 2014

CAx ET x EF x ED









EF

Exposure Frequency

250

days/year

USEPA, 2014

AT x 24 hours/day









ED

Exposure Duration

25

years

USEPA, 2014











AT-C

Averaging Time (Cancer)

25,550

days

USEPA, 2014

CA= (1/PEF + 1 /VF) x Cs









AT-N

Averaging Time (Non-Cancer)

9,125

days

USEPA, 2014











PEF

Particulate Emission Factor

3.24E+09

m3/kg

USEPA, 1996, 2018











VF

Volatilization Factor

Chemical-specific

m3/kg

USEPA, 2002a











Q/C

Inverse of mean concentration at

87.36898

g/m2-s per

USEPA, 1996, 2018













center of source



kg/m3





Sources:

USEPA, 1996: Soil Screening Level Guidance: Technical Background Document.

USEPA, 2002a: Supplemental Guidance for Developing Soil Screening Levels for Superfund Sites. OSWER 9355.4-24.

USEPA, 2002b:Calculating Upper Confidence Limits for Exposure Point Concentrations at Hazardous Waste Sites. OSWER 9285.6-10, December.

USEPA, 2014: Human Health Evaluation Manual, Supplemental Guidance: Update of Standard Default Exposure Factors. OSWER 9200.1-120.

USEPA, 2018: USEPA Regional Screening Level Calculator at http://epa-prgs.ornl.gov/cgi-bin/chemicals/csl_search. Site-specific values for Philadelphia, PA.


-------
TABLE 4.7.RME
VALUES USED FOR DAILY INTAKE CALCULATIONS
REASONABLE MAXIMUM EXPOSURE - INDUSTRIAL WORKERS - GROUNDWATER
OLD WILMINGTON ROAD SITE

Scenario Timeframe: Future
Medium: Groundwater
Exposure Medium: Groundwater

Exposure Route

Receptor Population

Receptor Age

Exposure Point

Parameter
Code

Parameter Definition

Value

Units

Rationale/
Reference

Intake Equation/
Model Name

Ingestion

Industrial Workers

Adult

Old Wilmington Road

CGW
CF

Chemical Concentration in Groundwater
Conversion Factor

Max or 95% UCL
0.001

ug/L
mg/ug

USEPA, 2014a

Chronic Daily Intake (CDI) (mg/kg/day) =









IR-GW

Ingestion Rate of Groundwater

1.25

L/day

(1)

CGW x CF x IR-GW x EF x ED









EF

Exposure Frequency

250

days/year

USEPA, 2014b

BWx AT









ED

Exposure Duration

25

years

USEPA, 2014b











BW

Body Weight

80

kg

USEPA, 2014b











AT-C

Averaging Time (Cancer)

25,550

days

USEPA, 2014b











AT-N

Averaging Time (Non-Cancer)

9,125

days

USEPA, 2014b



Dermal

Industrial Workers

Adult

Old Wilmington Road

Daevent
Cw

Dermally Absorbed Dose per Event
Chemical Concentration in Groundwater

Calculated
Max or 95% UCL

mg/cm2-event
ug/L

USEPA, 2004
USEPA, 2014a

Dermally Absorbed Dose (mg/kg/day) =









FA

Fraction Absorbed

Chemical Specific

unitless

USEPA, 2004

DAevent x EVx EF x ED x SA









CF

Conversion factor

0.001

L/cm3



BWx AT









Kp

Permeability coefficient

Chemical Specific

cm/hr

USEPA, 2004











X

Lag time

Chemical Specific

hr/event

USEPA, 2004

For inorganics









t*

Time it takes to reach steady state

Chemical Specific

hr/event

USEPA, 2004

DAevent = Kp x CW x CF x tevent









tevent

Duration of event

0.25

hr/event

(2)











B

Bunge model constant

Chemical Specific

unitless

USEPA, 2004

For organics if tevent <= t*









SA

Skin Surface Available for Contact

3,527

cm2

USEPA, 2014b

DAevent = 2 x FA x Kp x Cw x CF x sqrt[(6 xix tevent)/pi]









EV

Event Frequency

1

events/day

(2)











EF

Exposure Frequency

250

days/year

USEPA, 2014b

For organics if tevent > t*









ED

Exposure Duration

25

years

USEPA, 2014b

DAevent = FA x Kp x Cw x CF x [tevent/(1 +B) +









BW

Body Weight

80

kg

USEPA, 2014b

2n x (1 + 3B+ 3B2)/(1 + B2)]









AT-C

Averaging Time (Cancer)

25,550

days

USEPA, 2014b











AT-N

Averaging Time (Non-Cancer)

9,125

days

USEPA, 2014b



Notes

1	- USEPA, 2014: Frequently Asked Questions (FAQs) About Update of Standard Default Exposure Factors.

2	- Professional judgment.

USEPA, 2004: Risk Assessment Guidance for Superfund (Part E, Supplemental Guidance for Dermal Risk Assessment) Final. EPA/540/R/99/005.
USEPA, 2014a: Determining Groundwater Exposure Point Concentrations. OSWER 9283.1-42

USEPA, 2014b: Human Health Evaluation Manual, Supplemental Guidance: Update of Standard Default Exposure Factors. OSWER 9200.1-120.


-------
TABLE 4.8.RME
VALUES USED FOR DAILY INTAKE CALCULATIONS
REASONABLE MAXIMUM EXPOSURE - ADULT RESIDENTS - INHALATION OF VOLATILES FROM GROUNDWATER

OLD WILMINGTON ROAD SITE

Scenario Timeframe: Future
Medium: Groundwater
Exposure Medium: Air

Exposure Route

Receptor Population

Receptor Age

Exposure Point

Parameter

Parameter Definition

Value

Units

Rationale/

Intake Equation/









Code







Reference

Model Name

Inhalation

Industrial Workers

Adult

Old Wilmington Road

S

Volatile Chemical Generation Rate

Derived

mg/m3-min-shower

Foster&Chrostowski 1987

Exposure Concentration (mg/m3)=









K

Mass Transfer Coefficient

Derived

min

Foster&Chrostowski 1987











EF

Exposure Frequency

250

days/year

USEPA, 2014

Sx Kx EFx ED









ED

Exposure Duration

25

years

USEPA, 2014

AT x Ra x CF









Ra

Air Exchange Rate

0.017

min"1

Foster&Chrostowski 1987











CF

Conversion Factor

1,440

min/day

-

K = Ds + exof-Ra x Dt") - exofRa x CDs - Dt)l









Ds

Shower Duration

10

min

(1)

Ra









Dt

Total Time in Bathroom

15

min

(1)











Fr

Shower Water Flow Rate

10

L/min

Foster&Chrostowski 1987











Sv

Shower Room Air Volume

6

m3

Foster&Chrostowski 1987











ts

Shower Dropler Drop Time

2

sec

Foster&Chrostowski 1987











d

Shower Droplet Diameter

1

mm

Foster&Chrostowski 1987











T1

Calibration WaterTemperature

293

K

Foster&Chrostowski 1987











Ts

Shower Water Temperature

318

K

Foster&Chrostowski 1987











ml

Water Viscosity at T1

1.002

cp

Foster&Chrostowski 1987











ms

Water Viscosity at Ts

0.596

cp

Foster&Chrostowski 1987











AT-C

Averaging Time (Cancer)

25,550

days

USEPA, 2014











AT-N

Averaging Time (Noncancer)

9,125

days

USEPA, 2014



Notes:

1 - Professional judgment.

Sources:

USEPA, 2004: Risk Assessment Guidance for Superfund (Part E, Supplemental Guidance for Dermal Risk Assessment) Final. EPA/540/R/99/005.
USEPA, 2014: Human Health Evaluation Manual, Supplemental Guidance: Update of Standard Default Exposure Factors. OSWER 9200.1-120.
Foster, S.A. and P.C. Chrostowski, 1987. Inhalation Exposure to Volatile Organic Contaminants in the Shower.


-------
TABLE 4.9.RME
VALUES USED FOR DAILY INTAKE CALCULATIONS
REASONABLE MAXIMUM EXPOSURE - CHILD RESIDENTS - SOILS
OLD WILMINGTON ROAD SITE

Scenario Timeframe: Future
Medium: Surface Soil/Subsurface Soil

sure Medium: Surface/Subsurface Soil

Exposure Route

Receptor Population

Receptor Age

Exposure Point

Parameter

Parameter Definition

Value

Units

Rationale/

Intake Equation/









Code







Reference

Model Name

Ingestion

Resident

Child

Old Wilmington Road

CS

Chemical concentration in soil

Max or 95% UCL

mg/kg

USEPA, 2002

Intake (mg/kg/day) =









IR-S

Ingestion Rate

200

mg/day

USEPA, 2014











RBA

Relative Bioavailability

Chemical Specific

unitless

USEPA, 1989

Cs x RBA x IRS x CF3 x Fl x EF x ED









CF3

Conversion Factor 3

1.0E-06

kg/mg

-

BWx AT









Fl

Fraction Ingested

1

unitless

USEPA, 2014











EF

Exposure Frequency

350

days/year

USEPA, 2014











ED1

Exposure Duration (Age 0-2)

2

years

(1), USEPA, 2005, 2014











ED2

Exposure Duration (Age 2-6)

4

years

(1), USEPA, 2005, 2014











BW

Body Weight

15

kg

USEPA, 2014











AT-C

Averaging Time (Cancer)

25,550

days

USEPA, 2014











AT-N

Averaging Time (Non-Cancer)

2,190

days

USEPA, 2014



Dermal

Resident

Child

Old Wilmington Road

CS

Chemical concentration in soil

Max or 95% UCL

mg/kg

USEPA, 2002

Dermally Absorbed Dose (mg/kg/day) =









CF3

Conversion Factor 3

1E-06

kg/mg

-











SA

Skin Surface Available for Contact

2,373

cm2

USEPA, 2014

CS x CF3 x SA x SSAF x DABS x EV x EF x ED









SSAF

Soil to Skin Adherence Factor

0.2

mg/cm2/event

USEPA, 2014

BWx AT









DABS

Absorption Factor

Chemical Specific

unitless

USEPA, 2004











EV

Events Frequency

1

events/day

USEPA, 2004











EF

Exposure Frequency

350

days/year

USEPA, 2014











ED1

Exposure Duration (Age 0-2)

2

years

(1), USEPA, 2005, 2014











ED2

Exposure Duration (Age 2-6)

4

years

(1), USEPA, 2005, 2014











BW

Body Weight

15

kg

USEPA, 2014











AT-C

Averaging Time (Cancer)

25,550

days

USEPA, 2014











AT-N

Averaging Time (Non-Cancer)

2,190

days

USEPA, 2014



Notes:

1 - Children will be evaluated as one age group (0-6 years) for non-mutagenic chemicals. For chemicals that act via the mutagenic mode of action, residential children will be evaluated as two age groups, 0-2 years and 2-6 years in accordance

with USEPA's Supplemental Guidance of Assessing Susceptibility from Early-Life Exposure to Carcinogens (USEPA, 2005).

Sources:

USEPA, 1989: Risk Assessment Guidance for Superfund. Vol 1: Human Health Evaluation Manual, Part A. EPA/540/1-86/060.

USEPA, 2002:Calculating Upper Confidence Limits for Exposure Point Concentrations at Hazardous Waste Sites. OSWER 9285.6-10, December.
USEPA, 2004: Risk Assessment Guidance for Superfund (Part E, Supplemental Guidance for Dermal Risk Assessment) Final. EPA/540/R/99/005.
USEPA, 2014: Human Health Evaluation Manual, Supplemental Guidance: Update of Standard Default Exposure Factors. OSWER 9200.1-120.


-------
TABLE 4.10.RME
VALUES USED FOR DAILY INTAKE CALCULATIONS
REASONABLE MAXIMUM EXPOSURE - CHILD RESIDENTS SOILS TO AIR
OLD WILMINGTON ROAD SITE

Scenario Timeframe: Future
Medium: Surface Soil/Subsurface Soil
Exposure Medium: Air

Exposure Route

Receptor Population

Receptor Age

Exposure Point

Parameter
Code

Parameter Definition

Value

Units

Rationale/
Reference

Intake Equation/
Model Name

Inhalation

Resident

Child

Old Wilmington Road

CA

Chemical concentration in air

Calculated

mg/m3

USEPA, 2002a

Exposure Concentration (mg/m3) =









CS

Chemical concentration in soil

Max or 95% UCL

mg/kg

USEPA, 2002b











ET

Exposure Time

24

hours/day

USEPA, 2014

CA x ET x EF x ED









EF

Exposure Frequency

350

days/year

USEPA, 2014

AT x 24 hours/day









ED1

Exposure Duration (Age 0 - 2)

2

years

(1), USEPA, 2005, 2014











ED2

Exposure Duration (Age 2 - 6)

4

years

(1), USEPA, 2005, 2014

CA = (1 /PEF + 1 /VF) x Cs









AT-C

Averaging Time (Cancer)

25,550

days

USEPA, 2014











AT-N

Averaging Time (Non-Cancer)

2,190

days

USEPA, 2014











PEF

Particulate Emission Factor

3.24E+09

m3/kg

USEPA, 1996, 2018











VF

Volatilization Factor

Chemical-specific

m3/kg

USEPA, 2002a











Q/C

Inverse of mean concentration at

87.36898

g/m2-s per

USEPA, 1996, 2018













center of source



kg/m3





Notes:

1 - Children will be evaluated as one age group (0 - 6 years) for non-mutagenic chemicals. For chemicals that act via the mutagenic mode of action, residential children will be evaluated as two age groups, 0 - 2 years and 2 - 6 years in accordance

with USEPA's Supplemental Guidance of Assessing Susceptibility from Early-Life Exposure to Carcinogens (USEPA, 2005).

Sources:

USEPA, 1996: Soil Screening Level Guidance: Technical Background Document.

USEPA, 2002a: Supplemental Guidance for Developing Soil Screening Levels for Superfund Sites. OSWER 9355.4-24.

USEPA, 2002b: Calculating Upper Confidence Limits for Exposure Point Concentrations at Hazardous Waste Sites. OSWER 9285.6-10, December.

USEPA, 2014: Human Health Evaluation Manual, Supplemental Guidance: Update of Standard Default Exposure Factors. OSWER 9200.1-120.

USEPA, 2018: USEPA Regional Screening Level Calculator at http://epa-prgs.ornl.gov/cgi-bin/chemicals/csl_search. Site-specific values for Philadelphia, PA.


-------
TABLE 4.11 .RME
VALUES USED FOR DAILY INTAKE CALCULATIONS
REASONABLE MAXIMUM EXPOSURE - CHILD RESIDENTS - GROUNDWATER
OLD WILMINGTON ROAD SITE

Scenario Timeframe: Future
Medium: Groundwater
Exposure Medium: Groundwater

Exposure Route

Receptor Population

Receptor Age

Exposure Point

Parameter

Parameter Definition

Value

Units

Rationale/

Intake Equation/









Code







Reference

Model Name

Ingestion

Residents

Child

Old Wilmington Road

CGW

Chemical Concentration in Groundwater

Max or 95% UCL

ug/L

USEPA, 2014a

Chronic Daily Intake (CDI) (mg/kg/day) =









CF

Conversion Factor

0.001

mg/ug













IR-GW

Ingestion Rate of Groundwater

0.78

L/day

USEPA, 2014b

CGW x CF x IR-GW x EF x ED









EF

Exposure Frequency

350

days/year

USEPA, 2014b

BWx AT









ED1

Exposure Duration (Age 0 - 2)

2

years

(1), USEPA, 2005, 2014b











ED2

Exposure Duration (Age 2 - 6)

4

years

(1), USEPA, 2005, 2014b











BW

Body Weight

15

kg

USEPA, 2014b











AT-C

Averaging Time (Cancer)

25,550

days

USEPA, 2014b











AT-N

Averaging Time (Non-Cancer)

2,190

days

USEPA, 2014b



Dermal

Residents

Child

Old Wilmington Road

Daevent

Dermally Absorbed Dose per Event

Calculated

mg/cm2-event

USEPA, 2004

Dermally Absorbed Dose (mg/kg/day) =









Cw

Chemical Concentration in Groundwater

Max or 95% UCL

ug/L

USEPA, 2014a











FA

Fraction Absorbed

Chemical Specific

unitless

USEPA, 2004

DAevent x EV x EF x ED x SA









CF

Conversion factor

0.001

L/cm3



BWx AT









Kp

Permeability coefficient

Chemical Specific

cm/hr

USEPA, 2004











X

Lag time

Chemical Specific

hr/event

USEPA, 2004

For inorganics









t*

Time it takes to reach steady state

Chemical Specific

hr/event

USEPA, 2004

DAevent = Kp x CW x CF x tevent









tevent

Duration of event

0.54

hr/event

USEPA, 2014b











B

Bunge model constant

Chemical Specific

unitless

USEPA, 2004

For organics if tevent <= t*









SA

Skin Surface Available for Contact

6,365

cm2

USEPA, 2014b

DAevent = 2 x FA x Kp x Cw x CF x sqrt[(6 xix tevent)/pi]









EV

Event Frequency

1

events/day

USEPA, 2004











EF

Exposure Frequency

350

days/year

USEPA, 2014b

For organics if tevent > t*









ED1

Exposure Duration (Age 0 - 2)

2

years

(1), USEPA, 2005, 2014b

DAevent = FA x Kp x Cw x CF x [tevent/(1 +B) +









ED2

Exposure Duration (Age 2 - 6)

4

years

(1), USEPA, 2005, 2014b

2xtx(1 + 3B + 3B2)/(1 + B2)]









BW

Body Weight

15

kg

USEPA, 2014b











AT-C

Averaging Time (Cancer)

25,550

days

USEPA, 2014b











AT-N

Averaging Time (Non-Cancer)

2,190

days

USEPA, 2014b



Notes:

1 - Children will be evaluated as one age group (0 - 6 years) for non-mutagenic chemicals. For chemicals that act via the mutagenic mode of action, residential children will be evaluated as two age groups, 0 - 2 years and 2 - 6 years in accordance

with USEPA's Supplemental Guidance of Assessing Susceptibility from Early-Life Exposure to Carcinogens (USEPA, 2005).

Sources:

USEPA, 2004: Risk Assessment Guidance for Superfund (Part E, Supplemental Guidance for Dermal Risk Assessment) Final. EPA/540/R/99/005.
USEPA, 2014a: Determining Groundwater Exposure Point Concentrations. OSWER 9283.1-42

USEPA, 2014b: Human Health Evaluation Manual, Supplemental Guidance: Update of Standard Default Exposure Factors. OSWER 9200.1-120.


-------
TABLE 4.12.RME
VALUES USED FOR DAILY INTAKE CALCULATIONS
REASONABLE MAXIMUM EXPOSURE - CHILD RESIDENTS - SEDIMENT
OLD WILMINGTON ROAD SITE

Scenario Timeframe: Current/Future

Medium: Sediment

Exposure Medium: Sediment	

Exposure Route

Receptor Population

Receptor Age

Exposure Point

Parameter

Parameter Definition

Value

Units

Rationale/

Intake Equation/









Code







Reference

Model Name

Ingestion

Resident

Child

Old Wilmington Road

CS

Chemical concentration in sediment

Max or 95% UCL

mg/kg

USEPA, 2002

Intake (mg/kg/day) =









IR-S

Ingestion Rate

200

mg/day

USEPA, 2014











RBA

Relative Bioavailability

Chemical Specific

unitless

USEPA, 1989

Cs x RBA x IRS x CF3 x Fl x EF x ED









CF3

Conversion Factor 3

1.0E-06

kg/mg

-

BWx AT









Fl

Fraction Ingested

1

unitless

(1)











EF

Exposure Frequency

52

days/year

(1)











ED1

Exposure Duration (Age 0-2)

2

years

(2), USEPA, 2005, 2014











ED2

Exposure Duration (Age 2-6)

4

years

(2), USEPA, 2005, 2014











BW

Body Weight

15

kg

USEPA, 2014











AT-C

Averaging Time (Cancer)

25,550

days

USEPA, 2014











AT-N

Averaging Time (Non-Cancer)

2,190

days

USEPA, 2014



Dermal

Resident

Child

Old Wilmington Road

CS

Chemical concentration in sediment

Max or 95% UCL

mg/kg

USEPA, 2002

Dermally Absorbed Dose (mg/kg/day) =









CF3

Conversion Factor 3

1.0E-06

kg/mg

-











SA

Skin Surface Available for Contact

2,373

cm2

USEPA, 2014

CS x CF3 x SA x SSAF x DABS x EV x EF x ED









SSAF

Soil to Skin Adherence Factor

0.2

mg/cm2/event

USEPA, 2014

BWx AT









DABS

Absorption Factor

Chemical Specific

unitless

USEPA, 2004











EV

Events Frequency

1

events/day

USEPA, 2004











EF

Exposure Frequency

52

days/year

(1)











ED1

Exposure Duration (Age 0-2)

2

years

(2), USEPA, 2005, 2014











ED2

Exposure Duration (Age 2-6)

4

years

(2), USEPA, 2005, 2014











BW

Body Weight

15

kg

USEPA, 2014











AT-C

Averaging Time (Cancer)

25,550

days

USEPA, 2014











AT-N

Averaging Time (Non-Cancer)

2,190

days

USEPA, 2014



Notes:

1	- Professional judgment. Assume two days a week in warm weather months for RME and one day a weekfor CTE.

2	- Children will be evaluated as one age group (0-6 years) for non-mutagenic chemicals. For chemicals that act via the mutagenic mode of action, children residents will be evaluated as two age groups, 0-2 years and 2-6 years in accordance

with USEPA's Supplemental Guidance of Assessing Susceptibility from Early-Life Exposure to Carcinogens (USEPA, 2005).

Sources:

USEPA, 1989: Risk Assessment Guidance for Superfund. Vol 1: Human Health Evaluation Manual, Part A. EPA/540/1-86/060.

USEPA, 2002: Calculating Upper Confidence Limits for Exposure Point Concentrations at Hazardous Waste Sites. OSWER 9285.6-10, December.
USEPA, 2004: Risk Assessment Guidance for Superfund (Part E, Supplemental Guidance for Dermal Risk Assessment) Final. EPA/540/R/99/005.
USEPA, 2014: Human Health Evaluation Manual, Supplemental Guidance: Update of Standard Default Exposure Factors. OSWER 9200.1-120.


-------
TABLE 4.13.RME
VALUES USED FOR DAILY INTAKE CALCULATIONS
REASONABLE MAXIMUM EXPOSURE - ADULT RESIDENTS - SOILS
OLD WILMINGTON ROAD SITE

Scenario Timeframe: Future
Medium: Surface Soil/Subsurface Soil

sure Medium: Surface/Subsurface Soil

Exposure Route

Receptor Population

Receptor Age

Exposure Point

Parameter

Parameter Definition

Value

Units

Rationale/

Intake Equation/









Code







Reference

Model Name

Ingestion

Resident

Adult

Old Wilmington Road

CS

Chemical concentration in soil

Max or 95% UCL

mg/kg

USEPA, 2002

Intake (mg/kg/day) =









IR-S

Ingestion Rate

100

mg/day

USEPA, 2014











RBA

Relative Bioavailability

Chemical Specific

unitless

USEPA, 1989

Cs x RBA x IRS x CF3 x Fl x EF x ED









CF3

Conversion Factor 3

1.0E-06

kg/mg

-

BWx AT









Fl

Fraction Ingested

1

unitless

USEPA, 1989











EF

Exposure Frequency

350

days/year

USEPA, 2014











ED1

Exposure Duration (Age 6 - 16)

10

years

(1), USEPA, 2005, 2014)











ED2

Exposure Duration (Age 16 - 26)

10

years

(1), USEPA, 2005, 2014)











BW

Body Weight

80

kg

USEPA, 2014











AT-C

Averaging Time (Cancer)

25,550

days

USEPA, 2014











AT-N

Averaging Time (Non-Cancer)

7,300

days

USEPA, 2014



Dermal

Resident

Adult

Old Wilmington Road

CS

Chemical concentration in soil

Max or 95% UCL

mg/kg

USEPA, 2002

Dermally Absorbed Dose (mg/kg/day) =









CF3

Conversion Factor 3

1.0E-06

kg/mg

-











SA

Skin Surface Available for Contact

6,032

cm2

USEPA, 2014

CS x CF3 x SA x SSAF x DABS x EV x EF x ED









SSAF

Soil to Skin Adherence Factor

0.07

mg/cm2/event

USEPA, 2014

BWx AT









DABS

Absorption Factor

Chemical Specific

unitless

USEPA, 2004











EV

Events Frequency

1

events/day

USEPA, 2004











EF

Exposure Frequency

350

days/year

USEPA, 2014











ED1

Exposure Duration (Age 6 - 16)

10

years

(1), USEPA, 2005, 2014)











ED2

Exposure Duration (Age 16 - 26)

10

years

(1), USEPA, 2005, 2014)











BW

Body Weight

80

kg

USEPA, 2014











AT-C

Averaging Time (Cancer)

25,550

days

USEPA, 2014











AT-N

Averaging Time (Non-Cancer)

7,300

days

USEPA, 2014



Notes:

1 - Adults will be evaluated as one age group (7 - 26 years) for non-mutagenic chemicals. For chemicals that act via the mutagenic mode of action, adults will be evaluated as two age groups, 7-16 years and 16-26 years in accordance

with USEPA's Supplemental Guidance of Assessing Susceptibility from Early-Life Exposure to Carcinogens (USEPA, 2005).

Sources:

USEPA, 1989: Risk Assessment Guidance for Superfund. Vol 1: Human Health Evaluation Manual, Part A.

USEPA, 2002:Calculating Upper Confidence Limits for Exposure Point Concentrations at Hazardous Waste Sites. OSWER 9285.6-10, December.
USEPA, 2004: Risk Assessment Guidance for Superfund (Part E, Supplemental Guidance for Dermal Risk Assessment) Final. EPA/540/R/99/005.
USEPA, 2014: Human Health Evaluation Manual, Supplemental Guidance: Update of Standard Default Exposure Factors. OSWER 9200.1-120.


-------
TABLE 4.14.RME
VALUES USED FOR DAILY INTAKE CALCULATIONS
REASONABLE MAXIMUM EXPOSURE - ADULT RESIDENTS - SOILS TO AIR
OLD WILMINGTON ROAD SITE

Scenario Timeframe: Future
Medium: Surface Soil/Subsurface Soil
Exposure Medium: Air

Exposure Route

Receptor Population

Receptor Age

Exposure Point

Parameter
Code

Parameter Definition

Value

Units

Rationale/
Reference

Intake Equation/
Model Name

Inhalation

Resident

Adult

Old Wilmington Road

CA

Chemical concentration in air

Calculated

mg/m3

USEPA, 2002a

Exposure Concentration (mg/m3) =









CS

Chemical concentration in soil

Max or 95% UCL

mg/kg

USEPA, 2002b











ET

Exposure Time

24

hours/day

USEPA, 2014

CA x ET x EF x ED









EF

Exposure Frequency

350

days/year

USEPA, 2014

AT x 24 hours/day









ED1

Exposure Duration (Age 6 -16)

10

years

(1), USEPA, 2005, 2014)











ED2

Exposure Duration (Age 16 - 26)

10

years

(1), USEPA, 2005, 2014)

CA = (1 /PEF + 1 /VF) x Cs









AT-C

Averaging Time (Cancer)

25,550

days

USEPA, 2014











AT-N

Averaging Time (Non-Cancer)

7,300

days

USEPA, 2014











PEF

Particulate Emission Factor

3.24E+09

m3/kg

USEPA, 1996, 2018











VF

Volatilization Factor

Chemical-specific

m3/kg

USEPA, 2002a











Q/C

Inverse of mean concentration at

87.36898

g/m2-s per

USEPA, 1996, 2018













center of source



kg/m3





Notes:

1 - Adults will be evaluated as one age group (7 - 26 years) for non-mutagenic chemicals. For chemicals that act via the mutagenic mode of action, adults will be evaluated as two age groups, 7-16 years and 16-26 years in accordance

with USEPA's Supplemental Guidance of Assessing Susceptibility from Early-Life Exposure to Carcinogens (USEPA, 2005).

Sources:

USEPA, 1996: Soil Screening Level Guidance: Technical Background Document.

USEPA, 2002a: Supplemental Guidance for Developing Soil Screening Levels for Superfund Sites. OSWER 9355.4-24.

USEPA, 2002b: Calculating Upper Confidence Limits for Exposure Point Concentrations at Hazardous Waste Sites. OSWER 9285.6-10.

USEPA, 2014: Human Health Evaluation Manual, Supplemental Guidance: Update of Standard Default Exposure Factors. OSWER 9200.1-120.

USEPA, 2018: USEPA Regional Screening Level Calculator at http://epa-prgs.ornl.gov/cgi-bin/chemicals/csl_search. Site-specific values for Philadelphia, PA.


-------
TABLE 4.15.RME
VALUES USED FOR DAILY INTAKE CALCULATIONS
REASONABLE MAXIMUM EXPOSURE - ADULT RESIDENTS - GROUNDWATER
OLD WILMINGTON ROAD SITE

Scenario Timeframe: Future
Medium: Groundwater
Exposure Medium: Groundwater

Exposure Route

Receptor Population

Receptor Age

Exposure Point

Parameter
Code

Parameter Definition

Value

Units

Rationale/
Reference

Intake Equation/
Model Name

Ingestion

Residents

Adult

Old Wilmington Road

CGW
CF

Chemical Concentration in Groundwater
Conversion Factor

95% UCL or Max
0.001

ug/L
mg/ug

USEPA, 2014a

Chronic Daily Intake (CDI) (mg/kg/day) =









IR-GW

Ingestion Rate of Groundwater

2.5

L/day

USEPA, 2014b

CGW x CF x IR-GW x EF x ED









EF

Exposure Frequency

350

days/year

USEPA, 2014b

BWx AT









ED1

Exposure Duration (Age 6 -16)

10

years

(1), USEPA, 2005, 2014b











ED2

Exposure Duration (Age 16 - 26)

10

years

(1), USEPA, 2005, 2014b











BW

Body Weight

80

kg

USEPA, 2014b











AT-C

Averaging Time (Cancer)

25,550

days

USEPA, 2014b











AT-N

Averaging Time (Non-Cancer)

7,300

days

USEPA, 2014b



Dermal

Residents

Adult

Old Wilmington Road

Daevent

Dermally Absorbed Dose per Event

Calculated

mg/cm2-event

USEPA, 2004

Dermally Absorbed Dose (mg/kg/day) =









Cw

Chemical Concentration in Groundwater

Max or 95% UCL

ug/L

USEPA, 2014a

DAevent x EV x EF x ED x SA









FA

Fraction Absorbed

Chemical Specific

unitless

USEPA, 2004

BWx AT









CF

Conversion factor

0.001

L/cm3













Kp

Permeability coefficient

Chemical Specific

cm/hr

USEPA, 2004

For inorganics









X

Lag time

Chemical Specific

hr/event

USEPA, 2004

DAevent = Kp x CW x CF x tevent









t*

Time it takes to reach steady state

Chemical Specific

hr/event

USEPA, 2004











tevent

Duration of event

0.71

hr/event

USEPA, 2014b

For organics if tevent <= t*









B

Bunge model constant

Chemical Specific

unitless

USEPA, 2004

DAevent = 2 x FA x Kp x Cw x CF x sqrt[(6 xix tevent)/pi]









SA

Skin Surface Available for Contact

19,652

cm2

USEPA, 2014b











EV

Event Frequency

1

events/day

USEPA, 2004











EF

Exposure Frequency

350

days/year

USEPA, 2014b

For organics if tevent > t*









ED1

Exposure Duration (Age 6 -16)

10

years

(1), USEPA, 2005, 2014b

DAevent = FA x Kp x Cw x CF x [tevent/(1 +B) +









ED2

Exposure Duration (Age 16 - 26)

10

years

(1), USEPA, 2005, 2014b

2xt x(1 + 3B + 3B2)/(1 +B2)]









BW

Body Weight

80

kg

USEPA, 2014b











AT-C

Averaging Time (Cancer)

25,550

days

USEPA, 2014b











AT-N

Averaging Time (Non-Cancer)

7,300

days

USEPA, 2014b



Notes:

1 - Adults will be evaluated as one age group (7 - 26 years) for non-mutagenic chemicals. For chemicals that act via the mutagenic mode of action, adults will be evaluated as two age groups, 7-16 years and 16-26 years in accordance

with USEPA's Supplemental Guidance of Assessing Susceptibility from Early-Life Exposure to Carcinogens (USEPA, 2005).

Sources:

USEPA, 2004: Risk Assessment Guidance for Superfund (Part E, Supplemental Guidance for Dermal Risk Assessment) Final. EPA/540/R/99/005.
USEPA, 2014a: Determining Groundwater Exposure Point Concentrations. OSWER 9283.1-42

USEPA, 2014b: Human Health Evaluation Manual, Supplemental Guidance: Update of Standard Default Exposure Factors. OSWER 9200.1-120.


-------
TABLE 4.16.RME
VALUES USED FOR DAILY INTAKE CALCULATIONS
REASONABLE MAXIMUM EXPOSURE - ADULT RESIDENTS - INHALATION OF VOLATILES FROM GROUNDWATER

OLD WILMINGTON ROAD SITE

Scenario Timeframe: Future
Medium: Groundwater
Exposure Medium: Air

Exposure Route

Receptor Population

Receptor Age

Exposure Point

Parameter
Code

Parameter Definition

Value

Units

Rationale/
Reference

Intake Equation/
Model Name

Inhalation

Residents

Adult

Old Wilmington Road

S

Volatile Chemical Generation Rate

Derived

mg/m3-min-shower

Foster&Chrostowski 1987

Exposure Concentration (mg/m3)=









K

Mass Transfer Coefficient

Derived

min

Foster&Chrostowski 1987











EF

Exposure Frequency

350

showers/year

USEPA, 2014

Sx Kx EFx ED









ED1

Exposure Duration (Age 6-16)

10

years

(1), USEPA, 2005, 2014

AT x Ra x CF









ED2

Exposure Duration (Age 16-26)

10

years

(1), USEPA, 2005, 2014











Ra

Air Exchange Rate

0.017

min"1

Foster&Chrostowski 1987

K = Ds + exof-Ra x Dt") - exofRa x CDs - Dt)l









CF

Conversion Factor

1,440

min/day

-

Ra









Ds

Shower Duration

42.6

min

USEPA, 2014











Dt

Total Time in Bathroom

60

min

(2)











Fr

Shower Water Flow Rate

10

L/min

Foster&Chrostowski 1987











Sv

Shower Room Air Volume

6

m3

Foster&Chrostowski 1987











ts

Shower Dropler Drop Time

2

sec

Foster&Chrostowski 1987











d

Shower Droplet Diameter

1

mm

Foster&Chrostowski 1987











T1

Calibration WaterTemperature

293

K

Foster&Chrostowski 1987











Ts

Shower Water Temperature

318

K

Foster&Chrostowski 1987











ml

Water Viscosity at T1

1.002

cp

Foster&Chrostowski 1987











ms

Water Viscosity at Ts

0.596

cp

Foster&Chrostowski 1987











AT-C

Averaging Time (Cancer)

25,550

days

USEPA, 2014











AT-N

Averaging Time (Noncancer)

7,300

days

USEPA, 2014



Notes:

1 - Adults will be evaluated as one age group (7 - 26 years) for non-mutagenic chemicals. For chemicals that act via the mutagenic mode of action, adults will be evaluated as two age groups, 7-16 years and 16 - 26 years in accordance

with USEPA's Supplemental Guidance of Assessing Susceptibility from Early-Life Exposure to Carcinogens (USEPA, 2005).

2 - Professional judgment.

Sources:

USEPA, 2004: Risk Assessment Guidance for Superfund (Part E, Supplemental Guidance for Dermal Risk Assessment) Final. EPA/540/R/99/005.
USEPA, 2014: Human Health Evaluation Manual, Supplemental Guidance: Update of Standard Default Exposure Factors. OSWER 9200.1-120.
Foster, S.A. and P.C. Chrostowski, 1987. Inhalation Exposure to Volatile Organic Contaminants in the Shower.


-------
TABLE 4.17.RME
VALUES USED FOR DAILY INTAKE CALCULATIONS
REASONABLE MAXIMUM EXPOSURE - ADULT RESIDENTS - SEDIMENT
OLD WILMINGTON ROAD SITE

Scenario Timeframe: Current/Future

Medium: Sediment

Exposure Medium: Sediment	

Exposure Route

Receptor Population

Receptor Age

Exposure Point

Parameter

Parameter Definition

Value

Units

Rationale/

Intake Equation/









Code







Reference

Model Name

Ingestion

Residents

Adult

Old Wilmington Road

CS

Chemical concentration in sediment

Max or 95% UCL

mg/kg

USEPA, 2002

Intake (mg/kg/day) =









IR-S

Ingestion Rate

100

mg/day

USEPA, 2014











RBA

Relative Bioavailability

Chemical Specific

unitless

USEPA, 1989

Cs x RBA x IRS x CF3 x Fl x EF x ED









CF3

Conversion Factor 3

1.0E-06

kg/mg

-

BWx AT









Fl

Fraction Ingested

1

unitless

(1)











EF

Exposure Frequency

52

days/year

(1)











ED1

Exposure Duration (Age 6 - 16)

10

years

(2), USEPA, 2005, 2014











ED2

Exposure Duration (Age 16 - 26)

10

years

(2), USEPA, 2005, 2014











BW

Body Weight

80

kg

USEPA, 2014











AT-C

Averaging Time (Cancer)

25,550

days

USEPA, 2014











AT-N

Averaging Time (Non-Cancer)

7,300

days

USEPA, 2014



Dermal

Residents

Adult

Old Wilmington Road

CS

Chemical concentration in sediment

Max or 95% UCL

mg/kg

USEPA, 2002

Dermally Absorbed Dose (mg/kg/day) =









CF3

Conversion Factor 3

1.0E-06

kg/mg

-











SA

Skin Surface Available for Contact

6,032

cm2

USEPA, 2014

CS x CF3 x SA x SSAF x DABS x EV x EF x ED









SSAF

Soil to Skin Adherence Factor

0.07

mg/cm2/event

USEPA, 2014

BWx AT









DABS

Absorption Factor

Chemical Specific

unitless

USEPA, 2004











EV

Events Frequency

1

events/day

USEPA, 2004











EF

Exposure Frequency

52

days/year

(1)











ED1

Exposure Duration (Age 6 - 16)

10

years

(2), USEPA, 2005, 2014











ED2

Exposure Duration (Age 16 - 26)

10

years

(2), USEPA, 2005, 2014











BW

Body Weight

80

kg

USEPA, 2014











AT-C

Averaging Time (Cancer)

25,550

days

USEPA, 2014











AT-N

Averaging Time (Non-Cancer)

7,300

days

USEPA, 2014



Notes:

1	- Professional judgment. Assume two days a week in warm weather months for RME and one day a weekfor CTE.

2	- Adults will be evaluated as one age group (7 - 26 years) for non-mutagenic chemicals. For chemicals that act via the mutagenic mode of action, adults will be evaluated as two age groups, 7-16 years and 16-26 years in accordance

with USEPA's Supplemental Guidance of Assessing Susceptibility from Early-Life Exposure to Carcinogens (USEPA, 2005).

Sources:

USEPA, 1989: Risk Assessment Guidance for Superfund. Vol 1: Human Health Evaluation Manual, Part A. EPA/540/1-86/060.

USEPA, 2002: Calculating Upper Confidence Limits for Exposure Point Concentrations at Hazardous Waste Sites. OSWER 9285.6-10, December.
USEPA, 2004: Risk Assessment Guidance for Superfund (Part E, Supplemental Guidance for Dermal Risk Assessment) Final. EPA/540/R/99/005.
USEPA, 2014: Human Health Evaluation Manual, Supplemental Guidance: Update of Standard Default Exposure Factors. OSWER 9200.1-120.


-------
TABLE 4.1.CTE
VALUES USED FOR DAILY INTAKE CALCULATIONS
CENTRAL TENDENCY EXPOSURES - CONSTRUCTION WORKERS - SOILS
OLD WILMINGTON ROAD SITE

Scenario Timeframe: Future
Medium: Surface Soil/Subsurface Soil
Exposure Medium: Surface/Subsurface Soil

Exposure Route

Receptor Population

Receptor Age

Exposure Point

Parameter

Parameter Definition

Value

Units

Rationale/

Intake Equation/









Code







Reference

Model Name

Ingestion

Construction Workers

Adult

Old Wilmington Road

CS

Chemical concentration in soil

Max or 95% UCL

mg/kg

USEPA, 2002a

Intake (mg/kg/day) =









IR-S

Ingestion Rate

165

mg/day

(1)











RBA

Relative Bioavailability

Chemical Specific

unitless

USEPA, 1989

Cs x RBA x IRS x CF3 x Fl x EF x ED









CF3

Conversion Factor 3

1.0E-06

kg/mg

-

BWx AT









Fl

Fraction Ingested

1

unitless

USEPA, 2002b











EF

Exposure Frequency

125

days/year

(1)











ED

Exposure Duration

1

years

(1)











BW

Body Weight

80

kg

USEPA, 2014











AT-C

Averaging Time (Cancer)

25,550

days

USEPA, 2014











AT-N

Averaging Time (Non-Cancer)

365

days

USEPA, 2014



Dermal

Construction Workers

Adult

Old Wilmington Road

CS

Chemical concentration in soil

Max or 95% UCL

mg/kg

USEPA, 2002a

Dermally Absorbed Dose (mg/kg/day) =









CF3

Conversion Factor 3

1.0E-06

kg/mg

-











SA

Skin Surface Available for Contact

3,527

cm2

USEPA, 2014

CS x CF3 x SA x SSAF x DABS x EV x EF x ED









SSAF

Soil to Skin Adherence Factor

0.1

mg/cm2/event

USEPA, 2004

BWx AT









DABS

Absorption Factor

Chemical Specific

unitless

USEPA, 2004











EV

Events Frequency

1

events/day

USEPA, 2004











EF

Exposure Frequency

125

days/year

(1)











ED

Exposure Duration

1

years

(1)











BW

Body Weight

80

kg

USEPA, 2014











AT-C

Averaging Time (Cancer)

25,550

days

USEPA, 2014











AT-N

Averaging Time (Non-Cancer)

365

days

USEPA, 2014



Notes:

1 - Professional judgment. For some factors, CTE is assumed to be 50 percent of RM E.

Sources:

USEPA, 1989: Risk Assessment Guidance for Superfund. Vol 1: Human Health Evaluation Manual, Part A.

USEPA, 2002a:Calculating Upper Confidence Limits for Exposure Point Concentrations at Hazardous Waste Sites. OSWER 9285.6-10, December.
USEPA, 2002b: Supplemental Guidance for Developing Soil Screening Levels for Superfund Sites. OSWER 9355.4-24.

USEPA, 2004: Risk Assessment Guidance for Superfund (Part E, Supplemental Guidance for Dermal Risk Assessment) Final. EPA/540/R/99/005.
USEPA, 2014: Human Health Evaluation Manual, Supplemental Guidance: Update of Standard Default Exposure Factors. OSWER 9200.1-120.


-------
TABLE 4.2.CTE
VALUES USED FOR DAILY INTAKE CALCULATIONS
CENTRAL TENDENCY EXPOSURES - CONSTRUCTION WORKERS - SOILS TO AIR
OLD WILMINGTON ROAD SITE

Scenario Timeframe: Future
Medium: Surface Soil/Subsurface Soil
Exposure Medium: Air

Exposure Route

Receptor Population

Receptor Age

Exposure Point

Parameter
Code

Parameter Definition

Value

Units

Rationale/
Reference

Intake Equation/
Model Name

Inhalation

Construction Workers

Adult

Old Wilmington Road

CA

Chemical concentration in air

Calculated

mg/m3

USEPA, 2002a

Exposure Concentration (mg/m3) =









CS

Chemical concentration in soil

Max or 95% UCL

mg/kg

USEPA, 2002b











ET

Exposure Time

8

hours/day

(1)

CAx ET x EF x ED









EF

Exposure Frequency

125

days/year

(1)

AT x 24 hours/day









ED

Exposure Duration

1

years

(1)











AT-C

Averaging Time (Cancer)

25,550

days

USEPA, 2014

CA= (1/PEF + 1 /VF) x Cs









AT-N

Averaging Time (Non-Cancer)

365

days

USEPA, 2014











PEF

Particulate Emission Factor

1.40E+06

m3/kg

USEPA, 2002a











VF

Volatilization Factor

Chemical-specific

m3/kg

USEPA, 2002a











Q/C

Inverse of mean concentration at

14.31

g/m2-s per

USEPA, 2002a













center of source



kg/m3





Notes:

1 - Professional judgment. For some factors, CTE is assumed to be 50 percent of RME.

Sources:

USEPA, 2002a: Supplemental Guidance for Developing Soil Screening Levels for Superfund Sites. OSWER 9355.4-24.

USEPA, 2002b:Calculating Upper Confidence Limits for Exposure Point Concentrations at Hazardous Waste Sites. OSWER 9285.6-10, December.
USEPA, 2014: Human Health Evaluation Manual, Supplemental Guidance: Update of Standard Default Exposure Factors. OSWER 9200.1-120.


-------
TABLE 4.3.CTE
VALUES USED FOR DAILY INTAKE CALCULATIONS
CENTRAL TENDENCY EXPOSURES - CONSTRUCTION WORKERS - GROUNDWATER
OLD WILMINGTON ROAD SITE

Scenario Timeframe: Future
Medium: Groundwater
Exposure Medium: Groundwater

Exposure Route

Receptor Population

Receptor Age

Exposure Point

Parameter
Code

Parameter Definition

Value

Units

Rationale/
Reference

Intake Equation/
Model Name

Ingestion

Construction Workers

Adult

Old Wilmington Road

CGW
CF

Chemical Concentration in Groundwater
Conversion Factor

Max or 95% UCL
0.001

ug/L
mg/ug

USEPA, 2014a

Chronic Daily Intake (CDI) (mg/kg/day) =









IR-GW

Ingestion Rate of Groundwater

0.05

L/day

(1)

CGW x CFx IR-GW x EF x ED









EF

Exposure Frequency

30

days/year

(1)

BW x AT









ED

Exposure Duration

1

years

(1)











BW

Body Weight

80

kg

USEPA, 2014b











AT-C

Averaging Time (Cancer)

25,550

days

USEPA, 2014b











AT-N

Averaging Time (Non-Cancer)

365

days

USEPA, 2014b



Dermal

Construction Workers

Adult

Old Wilmington Road

Daevent
Cw

Dermally Absorbed Dose per Event
Chemical Concentration in Groundwater

Calculated
Max or 95% UCL

mg/cm2-event
ug/L

USEPA, 2004
USEPA, 2014a

Dermally Absorbed Dose (mg/kg/day) =









FA

Fraction Absorbed

Chemical Specific

unitless

USEPA, 2004

DAevent x EV x EF x ED x SA









CF

Conversion factor

0.001

L/cm3



BW x AT









Kp

Permeability coefficient

Chemical Specific

cm/hr

USEPA, 2004











X

Lag time

Chemical Specific

hr/event

USEPA, 2004

For inorganics









t*

Time it takes to reach steady state

Chemical Specific

hr/event

USEPA, 2004

DAevent = Kp x CW x CF x tevent









tevent

Duration of event

4

hr/event

(1)











B

Bunge model constant

Chemical Specific

unitless

USEPA, 2004

For organics if tevent <= t*









SA

Skin Surface Available for Contact

3,527

cm2

USEPA, 2014b

DAevent= 2 x FAx Kp x Cw x CF x sqrt[(6 xix tevent)/pi]









EV

Event Frequency

1

events/day

(1)











EF

Exposure Frequency

30

days/year

(1)

For organics if tevent > t*









ED

Exposure Duration

1

years

(1)

DAevent =FA x Kp x Cw x CF x [tevent/(1 +B) +









BW

Body Weight

80

kg

USEPA, 2014b

2n +(1 + 3B + 3B2)/(1 +B2)









AT-C

Averaging Time (Cancer)

25,550

days

USEPA, 2014b











AT-N

Averaging Time (Non-Cancer)

365

days

USEPA, 2014b



Notes

1 - Professional judgment. For some factors, CTE is assumed to be 50 percent of RME.

USEPA, 2004: Risk Assessment Guidance for Superfund (Part E, Supplemental Guidance for Dermal Risk Assessment) Final. EPA/540/R/99/005.
USEPA, 2014a: Determining Groundwater Exposure Point Concentrations. OSWER 9283.1-42

USEPA, 2014b: Human Health Evaluation Manual, Supplemental Guidance: Update of Standard Default Exposure Factors. OSWER 9200.1-120.


-------
TABLE 4.4.CTE
VALUES USED FOR DAILY INTAKE CALCULATIONS
CENTRAL TENDENCY EXPOSURES - CONSTRUCTION WORKERS - GROUNDWATER TO AIR
OLD WILMINGTON ROAD SITE

Scenario Timeframe: Future
Medium: Groundwater
Exposure Medium: Air	

Exposure Route

Receptor Population

Receptor Age

Exposure Point

Parameter
Code

Parameter Definition

Value

Units

Rationale/
Reference

Intake Equation/
Model Name

Inhalation

Construction Workers

Adult

Old Wilmington Road

CA

Chemical concentration in air

Calculated

mg/m3

VDEQ, 2018

Exposure Concentration (mg/m3) =









CW

Chemical concentration in water.

Max or 95% UCL

ug/L

USEPA, 2014a











CF

Conversion Factor

0.001

mg/ug

-

CA x ET x EF x ED









ET

Exposure Time

4

hours/day

(1)

AT x 24 hours/day









EF

Exposure Frequency

30

days/year

(1)











ED

Exposure Duration

1

years

(1)

CA = CW x CF x VF









AT-C

Averaging Time (Cancer)

25,550

days

USEPA, 2014b











AT-N

Averaging Time (Non-Cancer)

365

days

USEPA, 2014b











VF

Volatilization Factor

Calculated

(mg/m3)/(mg/L)

VDEQ, 2018



Notes:

1 - Professional judgment. For some factors, CTE is assumed to be 50 percent of RME.

USEPA, 2014a: Determining Groundwater Exposure Point Concentrations. OSWER 9283.1-42

USEPA, 2014b: Human Health Evaluation Manual, Supplemental Guidance: Update of Standard Default Exposure Factors. OSWER 9200.1-120.
VDEQ, 2018: Virginia Unified Risk Assessment Model - VURAM 2.0 User's Guide.


-------
TABLE 4.5.CTE
VALUES USED FOR DAILY INTAKE CALCULATIONS
CENTRAL TENDENCY EXPOSURES - INDUSTRIAL WORKERS - SOIL
OLD WILMINGTON ROAD SITE

Scenario Timeframe: Current/Future
Medium: Surface Soil/Subsurface Soil
Exposure Medium: Surface/Subsurface Soil

Exposure Route

Receptor Population

Receptor Age

Exposure Point

Parameter

Parameter Definition

Value

Units

Rationale/

Intake Equation/









Code







Reference

Model Name

Ingestion

Industrial Workers

Adult

Old Wilmington Road

CS

Chemical concentration in soil

Max or 95% UCL

mg/kg

USEPA, 2002

Intake (mg/kg/day) =









IR-S

Ingestion Rate

50

mg/day

USEPA, 2011











RBA

Relative Bioavailability

Chemical Specific

unitless

USEPA, 1989

Cs x RBA x IRS x CF3 x Fl x EF x ED









CF3

Conversion Factor 3

1.0E-06

kg/mg

-

BWx AT









Fl

Fraction Ingested

1

unitless

USEPA, 1993











EF

Exposure Frequency

219

days/year

USEPA, 1993











ED

Exposure Duration

7

years

USEPA, 2011











BW

Body Weight

80

kg

USEPA, 2014











AT-C

Averaging Time (Cancer)

25,550

days

USEPA, 2014











AT-N

Averaging Time (Non-Cancer)

2,555

days

USEPA, 2014



Dermal

Industrial Workers

Adult

Old Wilmington Road

CS

Chemical concentration in soil

Max or 95% UCL

mg/kg

USEPA, 2002

Dermally Absorbed Dose (mg/kg/day) =









CF3

Conversion Factor 3

1.0E-06

kg/mg

-











SA

Skin Surface Available for Contact

3,527

cm2

USEPA, 2004

CS x CF3 x SA x SSAF x DABS x EV x EF x ED









SSAF

Soil to Skin Adherence Factor

0.02

mg/cm2/event

USEPA, 2004

BWx AT









DABS

Absorption Factor

Chemical Specific

unitless

USEPA, 2004











EV

Events Frequency

1

events/day

USEPA, 2004











EF

Exposure Frequency

219

days/year

USEPA, 1993











ED

Exposure Duration

7

years

USEPA, 2011











BW

Body Weight

80

kg

USEPA, 2014











AT-C

Averaging Time (Cancer)

25,550

days

USEPA, 2014











AT-N

Averaging Time (Non-Cancer)

2,555

days

USEPA, 2014



Risk Assessment Guidance for Superfund. Vol 1: Human Health Evaluation Manual, Part A.

Superfund's Standard Default Exposure Factors for the Central Tendency and Reasonable Maximum Exposure.

Calculating Upper Confidence Limits for Exposure Point Concentrations at Hazardous Waste Sites. OSWER 9285.6-10, December.

Risk Assessment Guidance for Superfund (Part E, Supplemental Guidance for Dermal Risk Assessment) Final. EPA/540/R/99/005.

Exposure Factors Handbook: 2011 Edition. EPA/600R-090/052F, Table 5-1, 16-103, and 16-105..

Human Health Evaluation Manual, Supplemental Guidance: Update of Standard Default Exposure Factors. OSWER 9200.1-120.

Sources:
USEPA, 1989:
USEPA, 1993:
USEPA, 2002:
USEPA, 2004:
USEPA, 2011:
USEPA, 2014:


-------
TABLE 4.6.CTE
VALUES USED FOR DAILY INTAKE CALCULATIONS
CENTRAL TENDENCY EXPOSURES - INDUSTRIAL WORKERS - SOIL TO AIR
OLD WILMINGTON ROAD SITE

Scenario Timeframe: Current/Future
Medium: Surface Soil/Subsurface Soil
Exposure Medium: Air

Exposure Route

Receptor Population

Receptor Age

Exposure Point

Parameter
Code

Parameter Definition

Value

Units

Rationale/
Reference

Intake Equation/
Model Name

Inhalation

Industrial Workers

Adult

Old Wilmington Road

CA

Chemical concentration in air

Calculated

mg/m3

USEPA, 2002a

Exposure Concentration (mg/m3) =









CS

Chemical concentration in soil

Max or 95% UCL

mg/kg

USEPA, 2002b











ET

Exposure Time

8

hours/day

USEPA, 2014

CAx ET x EF x ED









EF

Exposure Frequency

219

days/year

USEPA, 1993

AT x 24 hours/day









ED

Exposure Duration

7

years

USEPA, 2011











AT-C

Averaging Time (Cancer)

25,550

days

USEPA, 2014

CA= (1/PEF + 1 /VF) x Cs









AT-N

Averaging Time (Non-Cancer)

2,555

days

USEPA, 2014











PEF

Particulate Emission Factor

3.24E+09

m3/kg

USEPA, 1996, 2018











VF

Volatilization Factor

Chemical-specific

m3/kg

USEPA, 2002a











Q/C

Inverse of mean concentration at

87.36898

g/m2-s per

USEPA, 2018













center of source



kg/m3





Sources:

USEPA, 1993: Superfund Standard Default Exposure Factors for the Central Tendency and Reasonable Maximum Exposure.

USEPA, 1996: Soil Screening Level Guidance: Technical Background Document.

USEPA, 2002a: Supplemental Guidance for Developing Soil Screening Levels for Superfund Sites. OSWER 9355.4-24.

USEPA, 2002b:Calculating Upper Confidence Limits for Exposure Point Concentrations at Hazardous Waste Sites. OSWER 9285.6-10, December.

USEPA, 2011: Exposure Factors Handbook: 2011 Edition. EPA/600R-090/052F, Tables 16-103 and 16-105.

USEPA, 2014: Human Health Evaluation Manual, Supplemental Guidance: Update of Standard Default Exposure Factors. OSWER 9200.1-120.

USEPA, 2018: USEPA Regional Screening Level Calculator at http://epa-prgs.ornl.gov/cgi-bin/chemicals/csl_search. Site-specific values for Philadelphia, PA.


-------
TABLE 4.7.CTE
VALUES USED FOR DAILY INTAKE CALCULATIONS
CENTRAL TENDENCY EXPOSURES - INDUSTRIAL WORKERS - GROUNDWATER
OLD WILMINGTON ROAD SITE

Scenario Timeframe: Future
Medium: Groundwater
Exposure Medium: Groundwater

Exposure Route

Receptor Population

Receptor Age

Exposure Point

Parameter
Code

Parameter Definition

Value

Units

Rationale/
Reference

Intake Equation/
Model Name

Ingestion

Industrial Workers

Adult

Old Wilmington Road

CGW
CF

Chemical Concentration in Groundwater
Conversion Factor

Max or 95% UCL
0.001

ug/L
mg/ug

USEPA, 2014a

Chronic Daily Intake (CDI) (mg/kg/day) =









IR-GW

Ingestion Rate of Groundwater

0.6

L/day

(1)

CGW x CF x IR-GW x EF x ED









EF

Exposure Frequency

219

days/year

USEPA, 1993

BWx AT









ED

Exposure Duration

6.6

years

(2)











BW

Body Weight

80

kg

USEPA, 2014b











AT-C

Averaging Time (Cancer)

25,550

days

USEPA, 2014b











AT-N

Averaging Time (Non-Cancer)

2,409

days

USEPA, 2014b



Dermal

Industrial Workers

Adult

Old Wilmington Road

Daevent
Cw

Dermally Absorbed Dose per Event
Chemical Concentration in Groundwater

Calculated
Max or 95% UCL

mg/cm2-event
ug/L

USEPA, 2004
USEPA, 2014a

Dermally Absorbed Dose (mg/kg/day) =









FA

Fraction Absorbed

Chemical Specific

unitless

USEPA, 2004

DAevent x EVx EF x ED x SA









CF

Conversion factor

0.001

L/cm3



BWx AT









Kp

Permeability coefficient

Chemical Specific

cm/hr

USEPA, 2004











X

Lag time

Chemical Specific

hr/event

USEPA, 2004

For inorganics









t*

Time it takes to reach steady state

Chemical Specific

hr/event

USEPA, 2004

DAevent = Kp x CW x CF x tevent









tevent

Duration of event

0.25

hr/event

(3)











B

Bunge model constant

Chemical Specific

unitless

USEPA, 2004

For organics if tevent <= t*









SA

Skin Surface Available for Contact

3,527

cm2

USEPA, 2014b

DAevent = 2 x FAx Kp x Cw x CF x sqrt[(6 xix tevent)/pi]









EV

Event Frequency

1

events/day

(3)











EF

Exposure Frequency

219

days/year

USEPA, 1993

For organics if tevent > t*









ED

Exposure Duration

6.6

years

(2)

DAevent = FAx Kp x Cw x CF x [tevent/(1+B) +









BW

Body Weight

80

kg

USEPA, 2014b

2n x (1 + 3B+ 3B2)/(1 +B2)]









AT-C

Averaging Time (Cancer)

25,550

days

USEPA, 2014b











AT-N

Averaging Time (Non-Cancer)

2,409

days

USEPA, 2014b



Notes

1 - USEPA, 2014: Frequently Asked Questions (FAQs) About Update of Standard Default Exposure Factors.

2-USEPA, 2011. Exposure Factors Handbook: 2011 Edition, Table 16-103.

3 - Professional judgment.

USEPA, 1993: Superfund's Standard Default Exposure Factors for the Central Tendency and Reasonable Maximum Exposure.

USEPA, 2004: Risk Assessment Guidance for Superfund (Part E, Supplemental Guidance for Dermal Risk Assessment) Final. EPA/540/R/99/005.

USEPA, 2014a: Determining Groundwater Exposure Point Concentrations. OSWER 9283.1-42

USEPA, 2014b: Human Health Evaluation Manual, Supplemental Guidance: Update of Standard Default Exposure Factors. OSWER 9200.1-120.


-------
TABLE 4.8.CTE
VALUES USED FOR DAILY INTAKE CALCULATIONS
REASONABLE MAXIMUM EXPOSURE - ADULT RESIDENTS - INHALATION OF VOLATILES FROM GROUNDWATER

OLD WILMINGTON ROAD SITE

Scenario Timeframe: Future
Medium: Groundwater
Exposure Medium: Air

Exposure Route

Receptor Population

Receptor Age

Exposure Point

Parameter

Parameter Definition

Value

Units

Rationale/

Intake Equation/









Code







Reference

Model Name

Inhalation

Industrial Workers

Adult

Old Wilmington Road

S

Volatile Chemical Generation Rate

Derived

mg/m3-min-shower

Foster & Chrostowski 1987

Exposure Concentration (mg/m3)=









K

Mass Transfer Coefficient

Derived

min

Foster&Chrostowski 1987











EF

Exposure Frequency

219

days/year

USEPA, 1993

Sx Kx EFx ED









ED

Exposure Duration

6.6

years

USEPA, 2011

AT x Ra x CF









Ra

Air Exchange Rate

0.017

min"1

Foster&Chrostowski 1987











CF

Conversion Factor

1,440

min/day

-

K = Ds + exof-Ra x Dt") - exofRa x CDs - Dt)l









Ds

Shower Duration

10

min

(1)

Ra









Dt

Total Time in Bathroom

15

min

(1)











Fr

Shower Water Flow Rate

10

L/min

Foster&Chrostowski 1987











Sv

Shower Room Air Volume

6

m3

Foster&Chrostowski 1987











ts

Shower Dropler Drop Time

2

sec

Foster&Chrostowski 1987











d

Shower Droplet Diameter

1

mm

Foster&Chrostowski 1987











T1

Calibration WaterTemperature

293

K

Foster&Chrostowski 1987











Ts

Shower Water Temperature

318

K

Foster&Chrostowski 1987











ml

Water Viscosity at T1

1.002

cp

Foster&Chrostowski 1987











ms

Water Viscosity at Ts

0.596

cp

Foster&Chrostowski 1987











AT-C

Averaging Time (Cancer)

25,550

days

USEPA, 2014











AT-N

Averaging Time (Noncancer)

2,409

days

USEPA, 2014



Notes:

1 - Professional judgment. For some factors, CTE is assumed to be 50 percent of RME.

Sources:

USEPA, 1993: Superfund Standard Default Exposure Factors for the Central Tendency and Reasonable Maximum Exposure.

USEPA, 2011: Exposure Factors Handbook: 2011 Edition.

USEPA, 2014: Human Health Evaluation Manual, Supplemental Guidance: Update of Standard Default Exposure Factors. OSWER 9200.1-120.
Foster, S.A. and P.C. Chrostowski, 1987. Inhalation Exposure to Volatile Organic Contaminants in the Shower.


-------
TABLE 4.9.CTE
VALUES USED FOR DAILY INTAKE CALCULATIONS
CENTRAL TENDENCY EXPOSURES - CHILD RESIDENTS - SOILS
OLD WILMINGTON ROAD SITE

Scenario Timeframe: Future
Medium: Surface Soil/Subsurface Soil
Exposure Medium: Surface/Subsurface Soil

Exposure Route

Receptor Population

Receptor Age

Exposure Point

Parameter

Parameter Definition

Value

Units

Rationale/

Intake Equation/









Code







Reference

Model Name

Ingestion

Resident

Child

Old Wilmington Road

CS

Chemical concentration in soil

Max or 95% UCL

mg/kg

USEPA, 2002

Intake (mg/kg/day) =









IR-S

Ingestion Rate

100

mg/day

USEPA, 2011











RBA

Relative Bioavailability

Chemical Specific

unitless

USEPA, 1989

Cs x RBA x IRS x CF3 x Fl x EF x ED









CF3

Conversion Factor 3

1.0E-06

kg/mg

-

BWx AT









Fl

Fraction Ingested

1

unitless

USEPA, 1993











EF

Exposure Frequency

234

days/year

USEPA, 1993











ED1

Exposure Duration (Age 0-2)

1

years

(1), USEPA, 2005, 2011











ED2

Exposure Duration (Age 2-6)

1

years

(1), USEPA, 2005, 2011











BW

Body Weight

15

kg

USEPA, 2014











AT-C

Averaging Time (Cancer)

25,550

days

USEPA, 2014











AT-N

Averaging Time (Non-Cancer)

730

days

USEPA, 2014



Dermal

Resident

Child

Old Wilmington Road

CS

Chemical concentration in soil

Max or 95% UCL

mg/kg

USEPA, 2002

Dermally Absorbed Dose (mg/kg/day) =









CF3

Conversion Factor 3

1E-06

kg/mg

-











SA

Skin Surface Available for Contact

2,373

cm2

USEPA, 2014

CS x CF3 x SA x SSAF x DABS x EV x EF x ED









SSAF

Soil to Skin Adherence Factor

0.04

mg/cm2/event

USEPA, 2004

BWx AT









DABS

Absorption Factor

Chemical Specific

unitless

USEPA, 2004











EV

Events Frequency

1

events/day

USEPA, 2004











EF

Exposure Frequency

234

days/year

USEPA, 1993











ED1

Exposure Duration (Age 0-2)

1

years

(1), USEPA, 2005, 2011











ED2

Exposure Duration (Age 2-6)

1

years

(1), USEPA, 2005, 2011











BW

Body Weight

15

kg

USEPA, 2014











AT-C

Averaging Time (Cancer)

25,550

days

USEPA, 2014











AT-N

Averaging Time (Non-Cancer)

730

days

USEPA, 2014



Notes:

1 - Children will be evaluated as one age group (0-6 years) for non-mutagenic chemicals. For chemicals that act via the mutagenic mode of action, residential children will be evaluated as two age groups, 0-2 years and 2-6 years in accordance

with USEPA's Supplemental Guidance of Assessing Susceptibility from Early-Life Exposure to Carcinogens (USEPA, 2005).

Sources:

USEPA, 1989: Risk Assessment Guidance for Superfund. Vol 1: Human Health Evaluation Manual, Part A. EPA/540/1-86/060.

USEPA, 1993: Superfund Standard Default Exposure Factors for the Central Tendency and Reasonable Maximum Exposure.

USEPA, 2002: Calculating Upper Confidence Limits for Exposure Point Concentrations at Hazardous Waste Sites. OSWER 9285.6-10, December.

USEPA, 2004: Risk Assessment Guidance for Superfund (Part E, Supplemental Guidance for Dermal Risk Assessment) Final. EPA/540/R/99/005.

USEPA, 2011: Exposure Factors Handbook: 2011 Edition. EPA/600R-090/052F, Tables 5-1 and 16-108.

USEPA, 2014: Human Health Evaluation Manual, Supplemental Guidance: Update of Standard Default Exposure Factors. OSWER 9200.1-120.


-------
TABLE 4.10.CTE
VALUES USED FOR DAILY INTAKE CALCULATIONS
CENTRAL TENDENCY EXPOSURES - CHILD RESIDENTS - SOILS TO AIR
OLD WILMINGTON ROAD SITE

Scenario Timeframe: Future
Medium: Surface Soil/Subsurface Soil
Exposure Medium: Air

Exposure Route

Receptor Population

Receptor Age

Exposure Point

Parameter
Code

Parameter Definition

Value

Units

Rationale/
Reference

Intake Equation/
Model Name

Inhalation

Resident

Child

Old Wilmington Road

CA

Chemical concentration in air

Calculated

mg/m3

USEPA, 2002a

Exposure Concentration (mg/m3) =









CS

Chemical concentration in soil

Max or 95% UCL

mg/kg

USEPA, 2002b











ET

Exposure Time

24

hours/day

USEPA, 2014

CA x ET x EF x ED









EF

Exposure Frequency

234

days/year

USEPA, 1993

AT x 24 hours/day









ED1

Exposure Duration (Age 0 - 2)

1

years

(1), USEPA, 2005, 2011











ED2

Exposure Duration (Age 2 - 6)

1

years

(1), USEPA, 2005, 2011











AT-C

Averaging Time (Cancer)

25,550

days

USEPA, 2014

CA = (1 /PEF + 1 /VF) x Cs









AT-N

Averaging Time (Non-Cancer)

730

days

USEPA, 2014











PEF

Particulate Emission Factor

3.24E+09

m3/kg

USEPA, 1996, 2018











VF

Volatilization Factor

Chemical-specific

m3/kg

USEPA, 2002a











Q/C

Inverse of mean concentration at

87.36898

g/m2-s per

USEPA, 1996, 2018













center of source



kg/m3





Notes:

1 - Children will be evaluated as one age group (0 - 6 years) for non-mutagenic chemicals. For chemicals that act via the mutagenic mode of action, residential children will be evaluated as two age groups, 0 - 2 years and 2 - 6 years in accordance

with USEPA's Supplemental Guidance of Assessing Susceptibility from Early-Life Exposure to Carcinogens (USEPA, 2005).

Sources:

USEPA, 1993: Superfund Standard Default Exposure Factors for the Central Tendency and Reasonable Maximum Exposure.

USEPA, 1996: Soil Screening Level Guidance: Technical Background Document.

USEPA, 2002a: Supplemental Guidance for Developing Soil Screening Levels for Superfund Sites. OSWER 9355.4-24.

USEPA, 2002b: Calculating Upper Confidence Limits for Exposure Point Concentrations at Hazardous Waste Sites. OSWER 9285.6-10, December.

USEPA, 2011: Exposure Factors Handbook: 2011 Edition. EPA/600R-090/052F, Table 16-108.

USEPA, 2014: Human Health Evaluation Manual, Supplemental Guidance: Update of Standard Default Exposure Factors. OSWER 9200.1-120.

USEPA, 2018: USEPA Regional Screening Level Calculator at http://epa-prgs.ornl.gov/cgi-bin/chemicals/csl_search. Site-specific values for Philadelphia, PA.


-------
TABLE 4.11.CTE
VALUES USED FOR DAILY INTAKE CALCULATIONS
CENTRAL TENDENCY EXPOSURES - CHILD RESIDENTS - GROUNDWATER
OLD WILMINGTON ROAD SITE

Scenario Timeframe: Future
Medium: Groundwater
Exposure Medium: Groundwater

Exposure Route

Receptor Population

Receptor Age

Exposure Point

Parameter
Code

Parameter Definition

Value

Units

Rationale/
Reference

Intake Equation/
Model Name

Ingestion

Residents

Child

Old Wilmington Road

CGW
CF

Chemical Concentration in Groundwater
Conversion Factor

Max or 95% UCL
0.001

ug/L
mg/ug

USEPA, 2014a

Chronic Daily Intake (CDI) (mg/kg/day) =









IR-GW

Ingestion Rate of Groundwater

0.45

L/day

USEPA, 2011

CGW x CF x IR-GW x EF x ED









EF

Exposure Frequency

234

days/year

USEPA, 1993

BWx AT









ED1

Exposure Duration (Age 0 - 2)

2

years

(1), USEPA, 2005, 2011











ED2

Exposure Duration (Age 2 - 6)

1

years

(1), USEPA, 2005, 2011











BW

Body Weight

15

kg

USEPA, 2014b











AT-C

Averaging Time (Cancer)

25,550

days

USEPA, 2014b











AT-N

Averaging Time (Non-Cancer)

1,095

days

USEPA, 2014b



Dermal

Residents

Child

Old Wilmington Road

Daevent
Cw

Dermally Absorbed Dose per Event
Chemical Concentration in Groundwater

Calculated
Max or 95% UCL

mg/cm2-event
ug/L

USEPA, 2004
USEPA, 2014a

Dermally Absorbed Dose (mg/kg/day) =









FA

Fraction Absorbed

Chemical Specific

unitless

USEPA, 2004

DAevent x EVx EF x ED x SA









CF

Conversion factor

0.001

L/cm3



BWx AT









Kp

Permeability coefficient

Chemical Specific

cm/hr

USEPA, 2004











X

Lag time

Chemical Specific

hr/event

USEPA, 2004

For inorganics









t*

Time it takes to reach steady state

Chemical Specific

hr/event

USEPA, 2004

DAevent = Kp x CW x CF x tevent









tevent

Duration of event

0.33

hr/event

USEPA, 2004











B

Bunge model constant

Chemical Specific

unitless

USEPA, 2004

For organics if tevent <= t*









SA

Skin Surface Available for Contact

6,365

cm2

USEPA, 2014b

DAevent = 2 x FAx Kp x Cw x CF x sqrt[(6 xix tevent)/pi]









EV

Event Frequency

1

events/day

USEPA, 2004











EF

Exposure Frequency

234

days/year

USEPA, 1993

For organics if tevent > t*









ED1

Exposure Duration (Age 0 - 2)

2

years

(1), USEPA, 2005, 2011

DAevent = FAx Kp x Cw x CF x [tevent/(1+B) +









ED2

Exposure Duration (Age 2 - 6)

1

years

(1), USEPA, 2005, 2011

2x n(1 + 3B+ 3B2)/(1 +B2)]









BW

Body Weight

15

kg

USEPA, 2014b











AT-C

Averaging Time (Cancer)

25,550

days

USEPA, 2014b











AT-N

Averaging Time (Non-Cancer)

1,095

days

USEPA, 2014b



Notes:

1 - Children will be evaluated as one age group (0 - 6 years) for non-mutagenic chemicals. For chemicals that act via the mutagenic mode of action, residential children will be evaluated as two age groups, 0 - 2 years and 2 - 6 years in accordance

with USEPA's Supplemental Guidance of Assessing Susceptibility from Early-Life Exposure to Carcinogens (USEPA, 2005).

Sources:

USEPA, 1993: Superfund Standard Default Exposure Factors for the Central Tendency and Reasonable Maximum Exposure.

USEPA, 2002: Calculating Upper Confidence Limits for Exposure Point Concentrations at Hazardous Waste Sites. OSWER 9285.6-10, December.

USEPA, 2004: Risk Assessment Guidance for Superfund (Part E, Supplemental Guidance for Dermal Risk Assessment) Final. EPA/540/R/99/005.

USEPA, 2011: Exposure Factors Handbook: 2011 Edition. Tables 3-15 and 3-33.

USEPA, 2014a: Determining Groundwater Exposure Point Concentrations. OSWER 9283.1-42

USEPA, 2014b: Human Health Evaluation Manual, Supplemental Guidance: Update of Standard Default Exposure Factors. OSWER 9200.1-120.


-------
TABLE 4.12.CTE
VALUES USED FOR DAILY INTAKE CALCULATIONS
CENTRAL TENDENCY EXPOSURES - CHILD RESIDENTS - SEDIMENT
OLD WILMINGTON ROAD SITE

Scenario Timeframe: Current/Future

Medium: Sediment

Exposure Medium: Sediment	

Exposure Route

Receptor Population

Receptor Age

Exposure Point

Parameter

Parameter Definition

Value

Units

Rationale/

Intake Equation/









Code







Reference

Model Name

Ingestion

Resident

Child

Old Wilmington Road

CS

Chemical concentration in sediment

Max or 95% UCL

mg/kg

USEPA, 2002

Intake (mg/kg/day) =









IR-S

Ingestion Rate

100

mg/day

USEPA, 1993











RBA

Relative Bioavailability

Chemical Specific

unitless

USEPA, 1989

Cs x RBA x IRS x CF3 x Fl x EF x ED









CF3

Conversion Factor 3

1.0E-06

kg/mg

(1)

BWx AT









Fl

Fraction Ingested

1

unitless

(1)











EF

Exposure Frequency

26

days/year

(1)











ED1

Exposure Duration (Age 0-2)

1

years

(2), USEPA, 1993, 2005











ED2

Exposure Duration (Age 2-6)

1

years

(2), USEPA, 1993, 2005











BW

Body Weight

15

kg

USEPA, 2014











AT-C

Averaging Time (Cancer)

25,550

days

USEPA, 2014











AT-N

Averaging Time (Non-Cancer)

730

days

USEPA, 2014



Dermal

Resident

Child

Old Wilmington Road

CS

Chemical concentration in sediment

Max or 95% UCL

mg/kg

USEPA, 2002

Dermally Absorbed Dose (mg/kg/day) =









CF3

Conversion Factor 3

1.0E-06

kg/mg

-











SA

Skin Surface Available for Contact

2,373

cm2

USEPA, 2014

CS x CF3 x SA x SSAF x DABS x EV x EF x ED









SSAF

Soil to Skin Adherence Factor

0.04

mg/cm2/event

USEPA, 2004

BWx AT









DABS

Absorption Factor

Chemical Specific

unitless

USEPA, 2004











EV

Events Frequency

1

events/day

USEPA, 2004











EF

Exposure Frequency

26

days/year

(1)











ED1

Exposure Duration (Age 0-2)

1

years

(2), USEPA, 1993, 2005











ED2

Exposure Duration (Age 2-6)

1

years

(2), USEPA, 1993, 2005











BW

Body Weight

15

kg

USEPA, 2014











AT-C

Averaging Time (Cancer)

25,550

days

USEPA, 2014











AT-N

Averaging Time (Non-Cancer)

730

days

USEPA, 2014



Notes:

1	- Professional judgment. Assume two days a week in warm weather months for RME and one day a weekfor CTE.

2	- Children will be evaluated as one age group (0-6 years) for non-mutagenic chemicals. For chemicals that act via the mutagenic mode of action, children residents will be evaluated as two age groups, 0-2 years and 2-6 years in accordance

with USEPA's Supplemental Guidance of Assessing Susceptibility from Early-Life Exposure to Carcinogens (USEPA, 2005).

Sources:

USEPA, 1989: Risk Assessment Guidance for Superfund. Vol 1: Human Health Evaluation Manual, Part A. EPA/540/1-86/060.

USEPA, 1993: Superfund's Standard Default Exposure Factors for the Central Tendency and Reasonable Maximum Exposure.

USEPA, 2002: Calculating Upper Confidence Limits for Exposure Point Concentrations at Hazardous Waste Sites. OSWER 9285.6-10, December.

USEPA, 2004: Risk Assessment Guidance for Superfund (Part E, Supplemental Guidance for Dermal Risk Assessment) Final. EPA/540/R/99/005.

USEPA, 2014: Human Health Evaluation Manual, Supplemental Guidance: Update of Standard Default Exposure Factors. OSWER 9200.1-120.


-------
TABLE 4.13.CTE
VALUES USED FOR DAILY INTAKE CALCULATIONS
CENTRAL TENDENCY EXPOSURES - ADULT RESIDENTS - SOILS
OLD WILMINGTON ROAD SITE

Scenario Timeframe: Future
Medium: Surface Soil/Subsurface Soil

sure Medium: Surface/Subsurface Soil

Exposure Route

Receptor Population

Receptor Age

Exposure Point

Parameter

Parameter Definition

Value

Units

Rationale/

Intake Equation/









Code







Reference

Model Name

Ingestion

Resident

Adult

Old Wilmington Road

CS

Chemical concentration in soil

Max or 95% UCL

mg/kg

USEPA, 2002

Intake (mg/kg/day) =









IR-S

Ingestion Rate

50

mg/day

USEPA, 2011











RBA

Relative Bioavailability

Chemical Specific

unitless

USEPA, 1989

Cs x RBA x IRS x CF3 x Fl x EF x ED









CF3

Conversion Factor 3

1.0E-06

kg/mg

-

BWx AT









Fl

Fraction Ingested

1

unitless

USEPA, 1993











EF

Exposure Frequency

234

days/year

USEPA, 1993











ED1

Exposure Duration (Age 6 - 16)

2

years

(1), USEPA, 2005, 2011











ED2

Exposure Duration (Age 16 - 26)

5

years

(1), USEPA, 2005, 2011











BW

Body Weight

80

kg

USEPA, 2014











AT-C

Averaging Time (Cancer)

25,550

days

USEPA, 2014











AT-N

Averaging Time (Non-Cancer)

2,555

days

USEPA, 2014



Dermal

Resident

Adult

Old Wilmington Road

CS

Chemical concentration in soil

Max or 95% UCL

mg/kg

USEPA, 2002

Dermally Absorbed Dose (mg/kg/day) =









CF3

Conversion Factor 3

1.0E-06

kg/mg

-











SA

Skin Surface Available for Contact

6,032

cm2

USEPA, 2014

CS x CF3 x SA x SSAF x DABS x EV x EF x ED









SSAF

Soil to Skin Adherence Factor

0.01

mg/cm2/event

USEPA, 2004

BWx AT









DABS

Absorption Factor

Chemical Specific

unitless

USEPA, 2004











EV

Events Frequency

1

events/day

USEPA, 2004











EF

Exposure Frequency

234

days/year

USEPA, 1993











ED1

Exposure Duration (Age 6 - 16)

2

years

(1), USEPA, 2005, 2011











ED2

Exposure Duration (Age 16 - 26)

5

years

(1), USEPA, 2005, 2011











BW

Body Weight

80

kg

USEPA, 2014











AT-C

Averaging Time (Cancer)

25,550

days

USEPA, 2014











AT-N

Averaging Time (Non-Cancer)

2,555

days

USEPA, 2014



Notes:

1 - Adults will be evaluated as one age group (7 - 26 years) for non-mutagenic chemicals. For chemicals that act via the mutagenic mode of action, adults will be evaluated as two age groups, 7-16 years and 16-26 years in accordance

with USEPA's Supplemental Guidance of Assessing Susceptibility from Early-Life Exposure to Carcinogens (USEPA, 2005).

Sources:

USEPA, 1989: Risk Assessment Guidance for Superfund. Vol 1: Human Health Evaluation Manual, Part A.

USEPA, 1993: Superfund Standard Default Exposure Factors for the Central Tendency and Reasonable Maximum Exposure.

USEPA, 2002: Calculating Upper Confidence Limits for Exposure Point Concentrations at Hazardous Waste Sites. OSWER 9285.6-10.

USEPA, 2004: Risk Assessment Guidance for Superfund (Part E, Supplemental Guidance for Dermal Risk Assessment) Final. EPA/540/R/99/005.

USEPA, 2011: Exposure Factors Handbook: 2011 Edition. EPA/600R-090/052F, Tables 5-1 and 16-108.

USEPA, 2014: Human Health Evaluation Manual, Supplemental Guidance: Update of Standard Default Exposure Factors. OSWER 9200.1-120.


-------
TABLE 4.14.CTE
VALUES USED FOR DAILY INTAKE CALCULATIONS
CENTRAL TENDENCY EXPOSURES - ADULT RESIDENTS - SOILS TO AIR
OLD WILMINGTON ROAD SITE

Scenario Timeframe: Future
Medium: Surface Soil/Subsurface Soil
Exposure Medium: Air

Exposure Route

Receptor Population

Receptor Age

Exposure Point

Parameter
Code

Parameter Definition

Value

Units

Rationale/
Reference

Intake Equation/
Model Name

Inhalation

Resident

Adult

Old Wilmington Road

CA

Chemical concentration in air

Calculated

mg/m3

USEPA, 2002a

Exposure Concentration (mg/m3) =









CS

Chemical concentration in soil

Max or 95% UCL

mg/kg

USEPA, 2002b











ET

Exposure Time

24

hours/day

USEPA, 2014

CA x ET x EF x ED









EF

Exposure Frequency

234

days/year

USEPA, 1993

AT x 24 hours/day









ED1

Exposure Duration (Age 6 -16)

2

years

(1), USEPA, 2005, 2011











ED2

Exposure Duration (Age 16 - 26)

5

years

(1), USEPA, 2005, 2011











AT-C

Averaging Time (Cancer)

25,550

days

USEPA, 2014

CA = (1 /PEF + 1 /VF) x Cs









AT-N

Averaging Time (Non-Cancer)

2,555

days

USEPA, 2014











PEF

Particulate Emission Factor

3.24E+09

m3/kg

USEPA, 1996, 2018











VF

Volatilization Factor

Chemical-specific

m3/kg

USEPA, 2002a











Q/C

Inverse of mean concentration at

87.36898

g/m2-s per

USEPA, 1996, 2018













center of source



kg/m3





Notes:

1 - Adults will be evaluated as one age group (7 - 26 years) for non-mutagenic chemicals. For chemicals that act via the mutagenic mode of action, adults will be evaluated as two age groups, 7-16 years and 16-26 years in accordance

with USEPA's Supplemental Guidance of Assessing Susceptibility from Early-Life Exposure to Carcinogens (USEPA, 2005).

Sources:

USEPA, 1993: Superfund Standard Default Exposure Factors for the Central Tendency and Reasonable Maximum Exposure.

USEPA, 1996: Soil Screening Level Guidance: Technical Background Document.

USEPA, 2002a: Supplemental Guidance for Developing Soil Screening Levels for Superfund Sites. OSWER 9355.4-24.

USEPA, 2002b: Calculating Upper Confidence Limits for Exposure Point Concentrations at Hazardous Waste Sites. OSWER 9285.6-10.

USEPA, 2011: Exposure Factors Handbook: 2011 Edition. EPA/600R-090/052F, Table 16-108.

USEPA, 2014: Human Health Evaluation Manual, Supplemental Guidance: Update of Standard Default Exposure Factors. OSWER 9200.1-120.

USEPA, 2018: USEPA Regional Screening Level Calculator at http://epa-prgs.ornl.gov/cgi-bin/chemicals/csl_search. Site-specific values for Philadelphia, PA.


-------
TABLE 4.15.CTE
VALUES USED FOR DAILY INTAKE CALCULATIONS
CENTRAL TENDENCY EXPOSURES - ADULT RESIDENTS - GROUNDWATER
OLD WILMINGTON ROAD SITE

Scenario Timeframe: Future
Medium: Groundwater
Exposure Medium: Groundwater

Exposure Route

Receptor Population

Receptor Age

Exposure Point

Parameter
Code

Parameter Definition

Value

Units

Rationale/
Reference

Intake Equation/
Model Name

Ingestion

Residents

Adult

Old Wilmington Road

CGW
CF

Chemical Concentration in Groundwater
Conversion Factor

95% UCL or Max
0.001

ug/L
mg/ug

USEPA, 2014a

Chronic Daily Intake (CDI) (mg/kg/day) =









IR-GW

Ingestion Rate of Groundwater

1.2

L/day

USEPA, 2011

CGW x CF x IR-GW x EF x ED









EF

Exposure Frequency

234

days/year

USEPA, 1993

BWx AT









ED1

Exposure Duration (Age 6-16)

2

years

(1), USEPA, 2005, 2011











ED2

Exposure Duration (Age 16-26)

7

years

(1), USEPA, 2005, 2011











BW

Body Weight

80

kg

USEPA, 2014b











AT-C

Averaging Time (Cancer)

25,550

days

USEPA, 2014b











AT-N

Averaging Time (Non-Cancer)

3,285

days

USEPA, 2014b



Dermal

Residents

Adult

Old Wilmington Road

Daevent
Cw

Dermally Absorbed Dose per Event
Chemical Concentration in Groundwater

Calculated
Max or 95% UCL

mg/cm2-event
ug/L

USEPA, 2004
USEPA, 2014a

Dermally Absorbed Dose (mg/kg/day) =









FA

Fraction Absorbed

Chemical Specific

unitless

USEPA, 2004

DAevent x EV x EF x ED x SA









CF

Conversion factor

0.001

L/cm3



BWx AT









Kp

Permeability coefficient

Chemical Specific

cm/hr

USEPA, 2004











X

Lag time

Chemical Specific

hr/event

USEPA, 2004

For inorganics









t*

Time it takes to reach steady state

Chemical Specific

hr/event

USEPA, 2004

DAevent = Kp x CW x CF x tevent









tevent

Duration of event

0.25

hr/event

USEPA, 2004











B

Bunge model constant

Chemical Specific

unitless

USEPA, 2004

For organics if tevent <= t*









SA

Skin Surface Available for Contact

19,652

cm2

USEPA, 2014b

DAevent = 2 x FA x Kp x Cw x CF x sqrt[(6 xix tevent)/pi]









EV

Event Frequency

1

events/day

USEPA, 2004











EF

Exposure Frequency

234

days/year

USEPA, 1993

For organics if tevent > t*









ED1

Exposure Duration (Age 6-16)

2

years

(1), USEPA, 2005, 2011

DAevent = FA x Kp x Cw x CF x [tevent/(1 + B) +









ED2

Exposure Duration (Age 16-26)

7

years

(1), USEPA, 2005, 2011

2xtx(1 + 3B + 3B2)/(1 + B2)]









BW

Body Weight

80

kg

USEPA, 2014b











AT-C

Averaging Time (Cancer)

25,550

days

USEPA, 2014b











AT-N

Averaging Time (Non-Cancer)

3,285

days

USEPA, 2014b



Notes:

1 - Adults will be evaluated as one age group (7 - 26 years) for non-mutagenic chemicals. For chemicals that act via the mutagenic mode of action, adults will be evaluated as two age groups, 7-16 years and 16-26 years in accordance

with USEPA's Supplemental Guidance of Assessing Susceptibility from Early-Life Exposure to Carcinogens (USEPA, 2005).

Sources:

USEPA, 1993: Superfund Standard Default Exposure Factors for the Central Tendency and Reasonable Maximum Exposure.

USEPA, 2004: Risk Assessment Guidance for Superfund (Part E, Supplemental Guidance for Dermal Risk Assessment) Final. EPA/540/R/99/005.

USEPA, 2011: Exposure Factors Handbook: 2011 Edition, Table 3-33.

USEPA, 2014a: Determining Groundwater Exposure Point Concentrations. OSWER 9283.1-42

USEPA, 2014b: Human Health Evaluation Manual, Supplemental Guidance: Update of Standard Default Exposure Factors. OSWER 9200.1-120.


-------
TABLE 4.16.CTE
VALUES USED FOR DAILY INTAKE CALCULATIONS
REASONABLE MAXIMUM EXPOSURE - ADULT RESIDENTS - INHALATION OF VOLATILES FROM GROUNDWATER

OLD WILMINGTON ROAD SITE

Scenario Timeframe: Future
Medium: Groundwater
Exposure Medium: Air

Exposure Route

Receptor Population

Receptor Age

Exposure Point

Parameter
Code

Parameter Definition

Value

Units

Rationale/
Reference

Intake Equation/
Model Name

Inhalation

Residents

Adult

Old Wilmington Road

S

Volatile Chemical Generation Rate

Derived

mg/m3-min-shower

Foster & Chrostowski 1987

Exposure Concentration (mg/m3)=









K

Mass Transfer Coefficient

Derived

min

Foster&Chrostowski 1987











EF

Exposure Frequency

234

showers/year

USEPA, 1993

Sx Kx EFx ED









ED1

Exposure Duration (Age 6-16)

2

years

(1), USEPA, 2005, 2011

AT x Ra x CF









ED2

Exposure Duration (Age 16-26)

7

years

(1), USEPA, 2005, 2011











Ra

Air Exchange Rate

0.017

min"1

Foster&Chrostowski 1987

K = Ds + exof-Ra x Dt") - exofRa x CDs - Dt)l









CF

Conversion Factor

1,440

min/day

-

Ra









Ds

Shower Duration

10

min

USEPA, 2004











Dt

Total Time in Bathroom

15

min

(2)











Fr

Shower Water Flow Rate

10

L/min

Foster&Chrostowski 1987











Sv

Shower Room Air Volume

6

m3

Foster&Chrostowski 1987











ts

Shower Dropler Drop Time

2

sec

Foster&Chrostowski 1987











d

Shower Droplet Diameter

1

mm

Foster&Chrostowski 1987











T1

Calibration WaterTemperature

293

K

Foster&Chrostowski 1987











Ts

Shower Water Temperature

318

K

Foster&Chrostowski 1987











ml

Water Viscosity at T1

1.002

cp

Foster&Chrostowski 1987











ms

Water Viscosity at Ts

0.596

cp

Foster&Chrostowski 1987











AT-C

Averaging Time (Cancer)

25,550

days

USEPA, 2014











AT-N

Averaging Time (Noncancer)

3,285

days

USEPA, 2014



Notes:

1 - Adults will be evaluated as one age group (7 - 26 years) for non-mutagenic chemicals. For chemicals that act via the mutagenic mode of action, adults will be evaluated as two age groups, 7-16 years and 16 - 26 years in accordance

with USEPA's Supplemental Guidance of Assessing Susceptibility from Early-Life Exposure to Carcinogens (USEPA, 2005).

2 - Professional judgment.

Sources:

USEPA, 1993: Superfund Standard Default Exposure Factors for the Central Tendency and Reasonable Maximum Exposure.

USEPA, 2004: Risk Assessment Guidance for Superfund (Part E, Supplemental Guidance for Dermal Risk Assessment) Final. EPA/540/R/99/005.

USEPA, 2011: Exposure Factors Handbook: 2011 Edition, Table 3-33.

USEPA, 2014: Human Health Evaluation Manual, Supplemental Guidance: Update of Standard Default Exposure Factors. OSWER 9200.1-120.
Foster, S.A. and P.C. Chrostowski, 1987. Inhalation Exposure to Volatile Organic Contaminants in the Shower.


-------
TABLE 4.17.CTE
VALUES USED FOR DAILY INTAKE CALCULATIONS
CENTRAL TENDENCY EXPOSURES - ADULT RESIDENTS - SEDIMENT
OLD WILMINGTON ROAD SITE

Scenario Timeframe: Current/Future

Medium: Sediment

Exposure Medium: Sediment	

Exposure Route

Receptor Population

Receptor Age

Exposure Point

Parameter

Parameter Definition

Value

Units

Rationale/

Intake Equation/









Code







Reference

Model Name

Ingestion

Residents

Adult

Old Wilmington Road

CS

Chemical concentration in sediment

Max or 95% UCL

mg/kg

USEPA, 2002

Intake (mg/kg/day) =









IR-S

Ingestion Rate

50

mg/day

USEPA, 1993











RBA

Relative Bioavailability

Chemical Specific

unitless

USEPA, 1989

Cs x RBA x IRS x CF3 x Fl x EF x ED









CF3

Conversion Factor 3

1.0E-06

kg/mg

-

BWx AT









Fl

Fraction Ingested

1

unitless

(1)











EF

Exposure Frequency

26

days/year

(1)











ED1

Exposure Duration (Age 6 - 16)

2

years

(2), USEPA, 1993, 2005











ED2

Exposure Duration (Age 16 - 26)

5

years

(2), USEPA, 1993, 2005











BW

Body Weight

80

kg

USEPA, 2014











AT-C

Averaging Time (Cancer)

25,550

days

USEPA, 2014











AT-N

Averaging Time (Non-Cancer)

2,555

days

USEPA, 2014



Dermal

Residents

Adult

Old Wilmington Road

CS

Chemical concentration in sediment

Max or 95% UCL

mg/kg

USEPA, 2002

Dermally Absorbed Dose (mg/kg/day) =









CF3

Conversion Factor 3

1.0E-06

kg/mg

-











SA

Skin Surface Available for Contact

6,032

cm2

USEPA, 2014

CS x CF3 x SA x SSAF x DABS x EV x EF x ED









SSAF

Soil to Skin Adherence Factor

0.01

mg/cm2/event

USEPA, 2004

BWx AT









DABS

Absorption Factor

Chemical Specific

unitless

USEPA, 2004











EV

Events Frequency

1

events/day

USEPA, 2004











EF

Exposure Frequency

26

days/year

(1)











ED1

Exposure Duration (Age 6 - 16)

2

years

(2), USEPA, 1993, 2005











ED2

Exposure Duration (Age 16 - 26)

5

years

(2), USEPA, 1993, 2005











BW

Body Weight

80

kg

USEPA, 2014











AT-C

Averaging Time (Cancer)

25,550

days

USEPA, 2014











AT-N

Averaging Time (Non-Cancer)

2,555

days

USEPA, 2014



Notes:

1	- Professional judgment. Assume two days a week in warm weather months for RME and one day a weekfor CTE.

2	- Adults will be evaluated as one age group (7 - 26 years) for non-mutagenic chemicals. For chemicals that act via the mutagenic mode of action, adults will be evaluated as two age groups, 7-16 years and 16-26 years in accordance

with USEPA's Supplemental Guidance of Assessing Susceptibility from Early-Life Exposure to Carcinogens (USEPA, 2005).

Sources:

USEPA, 1989: Risk Assessment Guidance for Superfund. Vol 1: Human Health Evaluation Manual, Part A. EPA/540/1-86/060.

USEPA, 1993: Superfund Standard Default Exposure Factors for the Central Tendency and Reasonable Maximum Exposure.

USEPA, 2002: Calculating Upper Confidence Limits for Exposure Point Concentrations at Hazardous Waste Sites. OSWER 9285.6-10, December.

USEPA, 2004: Risk Assessment Guidance for Superfund (Part E, Supplemental Guidance for Dermal Risk Assessment) Final. EPA/540/R/99/005.

USEPA, 2014: Human Health Evaluation Manual, Supplemental Guidance: Update of Standard Default Exposure Factors. OSWER 9200.1-120.


-------
RAGS Part D Table 5
Non-Cancer Toxicity Data


-------
LIST OF TABLES
RAGS PART D TABLE 5
NON-CANCER TOXICITY DATA

Table No.

5.1	Non-Cancer Toxicity Data - Oral/Dermal

5.2	Non-Cancer Toxicity Data - Inhalation


-------
TABLE 5.1

NON-CANCER TOXICITY DATA - ORAL/DERMAL
HUMAN HEALTH RISK ASSESSMENT REPORT
OLD WILMINGTON ROAD SITE
WEST CALN TOWNSHIP, CHESTER COUNTY, PENNSYLVANIA
PAGE 1 OF 2

Chemical
of Potential
Concern

Chronic/
Subchronic

Oral RfD

Oral Absorption
Efficiency
for Dermal'1'

Absorbed RfD for Dermal'2'

Primary
Target
Organ(s)

Combined
Uncertainty/Modifying
Factors

RfD:Target Organ(s)

Value

Units

Value

Units

Source(s)

Date(s)'3'
(MM/DD/YYYY)

Volatile Organic Compounds

1,2,4-Trimethylbenzene

Subchronic

4.0E-02

mg/kg/day

1

4.0E-02

mg/kg/day

Nervous

100

IRIS

5/11/2018

Chronic

1.0E-02

mg/kg/day

1

1.0E-02

mg/kg/day

Nervous

300

IRIS

5/11/2018

2-Butanone

Subchronic

2.0E+00

mg/kg/day

1

2.0E+00

mg/kg/day

Developmental

1000

HEAST

5/11/2018

Chronic

6.0E-01

mg/kg/day

1

6.0E-01

mg/kg/day

Developmental

1000

IRIS

5/11/2018

2-Hexanone

Chronic

5.0E-03

mg/kg/day

1

5.0E-03

mg/kg/day

Nervous

1000

IRIS

5/11/2018

Chloroform

Subchronic

1.0E-01

mg/kg/day

1

1.0E-01

mg/kg/day

Hepatic

100

ATSDR

9/1997

Chronic

1.0E-02

mg/kg/day

1

1.0E-02

mg/kg/day

Hepatic

100

IRIS

5/11/2018

cis-1,2-Dichloroethene

Subchronic

2.0E-02

mg/kg/day

1

2.0E-02

mg/kg/day

Urinary

300

PPRTV

5/11/2018

Chronic

2.0E-03

mg/kg/day

1

2.0E-03

mg/kg/day

Urinary

3000

IRIS

5/11/2018

Methyl Tert-Butyl Ether

NA

NA

NA

NA

NA

NA

NA

NA

NA

NA

Tetrachloroethene

Subchronic

1.0E-01

mg/kg/day

1

1.0E-01

mg/kg/day

Hepatic

100

HEAST

5/11/2018

Chronic

6.0E-03

mg/kg/day

1

6.0E-03

mg/kg/day

Nervous, Ocular

1000

IRIS

5/11/2018

Trichloroethene

Chronic

5.0E-04

mg/kg/day

1

5.0E-04

mg/kg/day

Developmental, Immune

10- 1000

IRIS

5/11/2018

Vinyl Chloride

Chronic

3.0E-03

mg/kg/day

1

3.0E-03

mg/kg/day

Hepatic

30

IRIS

5/11/2018

Semivolatile Organic Compounds

1,4-Dioxane

Subchronic

5.0E-01

mg/kg/day

1

5.0E-01

mg/kg/day

Hepatic

100

ATSDR

4/2012

Chronic

3.0E-02

mg/kg/day

1

3.0E-02

mg/kg/day

Hepatic, Urinary

300

IRIS

5/11/2018

Benzo(a)pyrene

Chronic

3.0E-04

mg/kg/day

1

3.0E-04

mg/kg/day

Developmental, Reproductive, Immune

300- 1000

IRIS

5/11/2018

Bis(2-ethylhexyl)phthalate

Subchronic

1.0E-01

mg/kg/day

1

1.0E-01

mg/kg/day

Reproductive

100

ATSDR

9/2002

Chronic

2.0E-02

mg/kg/day

1

2.0E-02

mg/kg/day

Hepatic

1000

IRIS

5/11/2018

Caprolactam

Subchronic

5.0E-01

mg/kg/day

1

5.0E-01

mg/kg/day

Urinary

100

HEAST

5/11/2018

Chronic

5.0E-01

mg/kg/day

1

5.0E-01

mg/kg/day

Developmental

100

IRIS

5/11/2018

Naphthalene

Subchronic

6.0E-01

mg/kg/day

1

6.0E-01

mg/kg/day

Nervous

90

ATSDR

8/2005

Chronic

2.0E-02

mg/kg/day

1

2.0E-02

mg/kg/day

Body Weight

3000

IRIS

5/11/2018

Pesticides/PCBs

Dieldrin

Subchronic

1.0E-04

mg/kg/day

1

1.0E-04

mg/kg/day

Nervous System

100

ATSDR

9/2002

Chronic

5.0E-05

mg/kg/day

1

5.0E-05

mg/kg/day

Hepatic

100

IRIS

5/11/2018

Inorganics

Aluminum

Subchronic

1.0E+00

mg/kg/day

1

1.0E+00

mg/kg/day

Nervous System

30

ATSDR

9/2008

Chronic

1.0E+00

mg/kg/day

1

1.0E+00

mg/kg/day

Nervous System

100

PPRTV

10/23/2006

Antimony

Subchronic

4.0E-04

mg/kg/day

0.15

6.0E-05

mg/kg/day

Whole Body

1000

PPRTV

7/29/2008

Chronic

4.0E-04

mg/kg/day

0.15

6.0E-05

mg/kg/day

Hematologic

1000

IRIS

5/11/2018

Arsenic

Chronic

3.0E-04

mg/kg/day

1

3.0E-04

mg/kg/day

Cardiovascular System, Dermal

3

IRIS

5/11/2018

Barium

Subchronic

2.0E-01

mg/kg/day

0.07

1.4E-02

mg/kg/day

Urinary

300

ATSDR

8/2007

Chronic

2.0E-01

mg/kg/day

0.07

1.4E-02

mg/kg/day

Urinary

300

IRIS

5/11/2018

Beryllium

Subchronic

5.0E-03

mg/kg/day

0.007

3.5E-05

mg/kg/day

None Reported

100

HEAST

5/11/2018

Chronic

2.0E-03

mg/kg/day

0.007

1.4E-05

mg/kg/day

Gastrointestinal

300

IRIS

5/11/2018

Cadmium (soil)

Chronic

1.0E-03

mg/kg/day

0.025

2.5E-05

mg/kg/day

Urinary

10

IRIS

5/11/2018

Cadmium (water)

Chronic

5.0E-04
3.0E-03

mg/kg/day

0.05

2.5E-05

mg/kg/day

Urinary

10
300

IRIS

5/11/2018

Cobalt

Subchronic

mg/kg/day

1

3.0E-03

mg/kg/day

Thyroid

PPRTV

8/25/2008

Chronic

3.0E-04

mg/kg/day

1

3.0E-04

mg/kg/day

Thyroid

3000

PPRTV

8/25/2008

Copper

Chronic

4.0E-02

mg/kg/day

1

4.0E-02

mg/kg/day

Gastrointestinal System

NA

HEAST

5/11/2018

Iron

Subchronic

7.0E-01

mg/kg/day

1

7.0E-01

mg/kg/day

Gastrointestinal System

1.5

PPRTV

9/11/2006

Chronic

7.0E-01

mg/kg/day

1

7.0E-01

mg/kg/day

Gastrointestinal System

1.5

PPRTV

9/11/2006


-------
TABLE 5.1

NON-CANCER TOXICITY DATA - ORAL/DERMAL
HUMAN HEALTH RISK ASSESSMENT REPORT
OLD WILMINGTON ROAD SITE
WEST CALN TOWNSHIP, CHESTER COUNTY, PENNSYLVANIA
PAGE 2 OF 2

Chemical
of Potential
Concern

Chronic/
Subchronic

Oral RfD

Oral Absorption
Efficiency
for Dermal'1'

Absorbed RfD for Dermal'2'

Primary
Target
Organ(s)

Combined
Uncertainty/Modifying
Factors

RfD:Target Organ(s)

Value

Units

Value

Units

Source(s)

Date(s)'3'
(MM/DD/YYYY)

Lead

NA

NA

NA

NA

NA

NA

NA

NA

NA

NA

Manganese141

Chronic

2.4E-02

mg/kg/day

0.04

9.6E-04

mg/kg/day

Nervous System

3

IRIS

5/11/2018

Mercury151

Subchronic

2.0E-03

mg/kg/day

0.07

1.4E-04

mg/kg/day

Urinary

100

ATSDR

3/1999

Chronic

3.0E-04

mg/kg/day

0.07

2.1E-05

mg/kg/day

Immune, Urinary

1000

IRIS

5/11/2018

Nickel

Subchronic

2.0E-02

mg/kg/day

0.04

8.0E-04

mg/kg/day

Body Weight

300

HEAST

5/11/2018

Chronic

2.0E-02

mg/kg/day

0.04

8.0E-04

mg/kg/day

Body Weight

300

IRIS

5/11/2018

Selenium

Subchronic

5.0E-03

mg/kg/day

1

5.0E-03

mg/kg/day

Body Weight

3

HEAST

5/11/2018

Chronic

5.0E-03

mg/kg/day

1

5.0E-03

mg/kg/day

Nervous, Hematologic, Dermal

3

IRIS

5/11/2018

Thallium

Subchronic

4.0E-05

mg/kg/day

1

4.0E-05

mg/kg/day

Dermal

1000

PPRTV-X

9/17/2012

Chronic

1.0E-05

mg/kg/day

1

1.0E-05

mg/kg/day

Dermal

3000

PPRTV-X

9/17/2012

Vanadium161

Subchronic

1.0E-02

mg/kg/day

0.026

2.6E-04

mg/kg/day

Urinary

10

ATSDR

9/2012

Chronic

5.0E-03

mg/kg/day

0.026

1.3E-04

mg/kg/day

Dermal

300

IRIS

5/11/2018

Zinc

Subchronic

3.0E-01

mg/kg/day

1

3.0E-01

mg/kg/day

Hematologic

3

ATSDR

8/2005

Chronic

3.0E-01

mg/kg/day

1

3.0E-01

mg/kg/day

Immune, Hematologic

3

IRIS

5/11/2018

Footnotes:

1	- U.S. EPA, 2004: Risk Assessment Guidance for Superfund (Part E, Supplemental Guidance for

Dermal Risk Assessment) Final. EPA/540/R/99/005.

2	- Adjusted dermal RfD = Oral RfD x Oral Absorption Efficiency for Dermal.

3	- Dates for IRIS and HEAST are the date the databases were searched. The dates for ATSDR, PPRTV,

and Cal EPA are the dates of the reference documents containing the toxicity values.

4	- Adjusted IRIS value in accordance with IRIS.

5	- No value is available for elemental mercury, value presented is for mercuric chloride.

6	- Chronic value from IRIS adjusted as specified in the USEPA Regional Screening Level User Guide (November 2017).

Definitions:

ATSDR = Agency for Toxic Substances and Disease Registry.
HEAST = Health Effects Assessment Summary Tables
IRIS = Integrated Risk Information System
NA = Not Available.

PPRTV = Provisional Peer Reviewed Toxicity Value.

PPRTV-X = Appendix Provisional Peer Reviewed Toxicity Value.


-------
TABLE 5.2

NON-CANCER TOXICITY DATA - INHALATION
HUMAN HEALTH RISK ASSESSMENT REPORT
OLD WILMINGTON ROAD SITE
WEST CALN TOWNSHIP, CHESTER COUNTY, PENNSYLVANIA

PAGE 1 OF 2

Chemical
of Potential
Concern

Chronic/
Subchronic

Inhalation RfC

Primary
Target
Organ(s)

Combined
Uncertainty/Modifying
Factors

RfC : Target Organ(s)

Value

Units

Source(s)

Date(s)11'
(MM/DD/YYYY)

Volatile Organic Compounds

1,2,4-T rimethylbenzene

Subchronic

2.0E-01

mg/m3

Nervous

100

IRIS

5/11/2018

Chronic

6.0E-02

mg/m3

Nervous

300

IRIS

5/11/2018

2-Butanone

Chronic

5.0E+00

mg/m3

Developmental, Musculoskeletal

300

IRIS

5/11/2018

2-Hexanone

Chronic

3.0E-02

mg/m3

Nervous

3000

IRIS

5/11/2018

Chloroform

Subchronic

2.4E-01

mg/m3

Hepatic

300

ATSDR

9/1997

Chronic

9.8E-02

mg/m3

Hepatic

100

ATSDR

9/1997

cis-1,2-Dichloroethene

NA

NA

NA

NA

NA

NA

NA

Methyl Tert-Butyl Ether

Chronic

3.0E+00

mg/m3

Hepatic, Urinary, Ocular

100

IRIS

5/11/2018

Tetrachloroethene

Chronic

4.0E-02

mg/m3

Nervous System, Ocular

1000

IRIS

5/11/2018

Trichloroethene

Chronic

2.0E-03

mg/m3

Developmental, Immune

10-100

IRIS

5/11/2018

Vinyl Chloride

Chronic

1.0E-01

mg/m3

Hepatic

30

IRIS

5/11/2018

Semivolatile Organic Compounds

1,4-Dioxane

Subchronic

7.2E-01

mg/m3

Respiratory System

30

ATSDR

4/2012

Chronic

3.0E-02

mg/m3

Nervous System, Respiratory

1000

IRIS

5/11/2018

Benzo(a)pyrene

Chronic

2.0E-06

mg/m3

Developmental, Reproductive

3000

IRIS

5/11/2018

Bis(2-ethylhexyl)phthalate

NA

NA

NA

NA

NA

NA

NA

Caprolactam

Chronic

2.2E-03

mg/m3

Respiratory System

NA

Cal EPA

10/2013

Naphthalene

Chronic

3.0E-03

mg/m3

Nervous System, Respiratory

3000

IRIS

5/11/2018

Pesticides/PCBs

Dieldrin

NA

NA

NA

NA

NA

NA

NA

Inorganics

Aluminum

Chronic

5.0E-03

mg/m3

Nervous System

300

PPRTV

10/23/2006

Antimony

NA

NA

NA

NA

NA

NA

NA

Arsenic

Chronic

1.5E-Q5

mg/m3

NA

NA

Cal EPA

12/2008

Barium

Subchronic

5.0E-03

mg/m3

Developmental

100

HE AST

5/11/2018

Chronic

5.0E-04

mg/m3

Developmental

1000

HE AST

5/11/2018

Beryllium

Chronic

2.0E-05

mg/m3

Immune, Respiratory

10

IRIS

5/11/2018

Cadmium

Chronic

1.0E-05

mg/m3

Urinary

9

ATSDR

9/2012

Cobalt

Subchronic

2.0E-05

mg/m3

Respiratory System

100

PPRTV

8/25/2008

Chronic

6.0E-06

mg/m

Respiratory System

300

PPRTV

8/25/2008


-------
TABLE 5.2

NON-CANCER TOXICITY DATA - INHALATION
HUMAN HEALTH RISK ASSESSMENT REPORT
OLD WILMINGTON ROAD SITE
WEST CALN TOWNSHIP, CHESTER COUNTY, PENNSYLVANIA

PAGE 2 OF 2

Chemical
of Potential
Concern

Chronic/
Subchronic

Inhalation RfC

Primary
Target
Organ(s)

Combined
Uncertainty/Modifying
Factors

RfC : Target Organ(s)

Value

Units

Source(s)

Date(s)11'
(MM/DD/YYYY)

Copper

NA

NA

NA

NA

NA

NA

NA

Iron

NA

NA

NA

NA

NA

NA

NA

Lead

NA

NA

NA

NA

NA

NA

NA

Manganese

Chronic

5.0E-05

mg/m

Nervous System

1000

IRIS

5/11/2018

Mercury

Subchronic

3.0E-04

mg/m3

Nervous System

30

HEAST

5/11/2018

Chronic

3.0E-04

mg/m3

Nervous System

30

IRIS

5/11/2018

Nickel

Subchronic

2.0E-04

mg/m3

Respiratory System

30

ATSDR

8/2005

Chronic

9.0E-05

mg/m3

Respiratory System

30

ATSDR

8/2005

Selenium

Chronic

2.0E-02

mg/m3

Respiratory System

NA

Cal EPA

12/2008

Thallium

NA

NA

NA

NA

NA

NA

NA

Vanadium

Chronic

1 .OE-04

mg/m3

Respiratory

30

ATSDR

9/2012

Zinc

NA

NA

NA

NA

NA

NA

NA

Footnotes:

1 - Dates for IRIS and HEAST are the date the databases were searched. The dates for ATSDR, PPRTV, and Cal EPA are the dates of the reference documents containing the toxicity values.
Definitions:

ATSDR = Agency for Toxic Substances and Disease Registry.

Cal EPA, 2008 = Technical Support Document for Noncancer RELs.

Cal EPA, 2013 = Reference Exposure Levels for Caprolactam.

HEAST = Health Effects Assessment Summary Table
IRIS = Integrated Risk Information System
NA = Not Applicable

PPRTV = Provisional Peer Reviewed Toxicity Value.


-------
RAGS Part D Table 6
Cancer Toxicity Data


-------
LIST OF TABLES
RAGS PART D TABLE 6
CANCER TOXICITY DATA

Table No.

6 1 Cancer Toxicity Data - Oral/Dermal
6 2 Cancer Toxicity Data - Inhalation


-------
TABLE 6.1

CANCER TOXICITY DATA - ORAL/DERMAL
HUMAN HEALTH RISK ASSESSMENT REPORT
OLD WILMINGTON ROAD SITE
WEST CALN TOWNSHIP, CHESTER COUNTY, PENNSYLVANIA
PAGE 1 OF 2

Chemical

Oral Cancer Slope Factor

Oral Absorption

Absorbed Cancer Slope Factor

Weight of Evidence/

Oral CSF

of Potential





Efficiency

for Dermal*2*

Cancer Guideline





Concern

Value

Units

for Dermal*1*

Value

Units

Description*3*

Source(s)

Date(s)(4)
(MSWDD/YYYY)

Volatile Organic Compounds

1,2,4-T rimethy Ibenzene

NA

NA

NA

NA

NA

Inadequate information to assess carcinogenic
potential

IRIS

5/11/2018

2-Butanone

NA

NA

NA

NA

NA

Data are inadequate for an assessment of
human carcinogenic potential

IRIS

5/11/2018

2-Hexanone

NA

NA

NA

NA

NA

Inadequate information to assess carcinogenic
potential

IRIS

5/11/2018

Chloroform

3.1E-02

(mg/kg/day)"1

1

3.1E-02

(mg/kg/day)"1

Likely to be carcinogenic to humans

Cal EPA

6/2009

cis-1,2-Dichloroethene

NA

NA

NA

NA

NA

Inadequate information to assess carcinogenic
potential

IRIS

5/11/2018

Methyl Tert-Butyl Ether

1.8E-03

(mg/kg/day)"1

1

1.8E-03

(mg/kg/day)"1

NA

Cal EPA

6/2009

Tetrachloroethene

2.1E-03

(mg/kg/day)"1

1

2.1E-03

(mg/kg/day)"1

Likely to be carcinogenic to humans

IRIS

5/11/2018

Trichloroethene (Mutagenic)'5'

9.3E-03

(mg/kg/day)-1

1

9.3E-03

(mg/kg/day)"1

Carcinogenic to humans

IRIS

5/11/2018

Trichloroethene (Nonmutagenic)

3.7E-02

(mg/kg/day)"1

1

3.7E-02

(mg/kg/day)"1

Carcinogenic to humans

IRIS

5/11/2018

Vinyl Chloride

7.2E-01

(mg/kg/day)"1

1

7.2E-01

(mg/kg/day)"1

Known/likely human carcinogen

IRIS

5/11/2018

Semivolatile Organic Compounds

1,4-Dioxane

1.0E-01

(mg/kg/day)"1

1

1.0E-01

(mg/kg/day)"1

Likely to be carcinogenic to humans

IRIS

5/11/2018

Benzo(a)pyrene(5)

1.0E+00

(mg/kg/day)"1

1

1.0E+00

(mg/kg/day)"1

Carcinogenic to humans

IRIS

5/11/2018

Bis(2-ethylhexyl)phthalate

1.4E-02

(mg/kg/day)"1

1

1.4E-02

(mg/kg/day)"1

B2 (Probable human carcinogen)

IRIS

5/11/2018

Caprolactam

NA

NA

NA

NA

NA

NA

NA

NA

Naphthalene

NA

NA

NA

NA

NA

Carcinogenic potential cannot be determined

IRIS

5/11/2018

Pesticides/PCBs

Dieldrin

1.6E+01

(mg/kg/day)"1

1

1.6E+01

(mg/kg/day)"1

B2 (Probable human carcinogen)

IRIS

5/11/2018

Inorganics

Aluminum

NA

NA

NA

NA

NA

NA

NA

NA

Antimony

NA

NA

NA

NA

NA

NA

NA

NA

Arsenic

1.5E+00

(mg/kg/day)"1

1

1.5E+00

(mg/kg/day)"1

A (human carcinogen)

IRIS

5/11/2018

Barium

NA

NA

NA

NA

NA

Not likely to be carcinogenic to humans

IRIS

5/11/2018

Beryllium

NA

NA

NA

NA

NA

Carcinogenic potential cannot be determined

IRIS

5/11/2018

Cadmium

NA

NA

NA

NA

NA

B1 (Probable human carcinogen)

IRIS

5/11/2018

Cobalt

NA

NA

NA

NA

NA

NA

NA

NA

Copper

NA

NA

NA

NA

NA

D (Not classifiable as to human
carcinogenicity)

IRIS

5/11/2018

Iron

NA

NA

NA

NA

NA

NA

NA

NA

Lead

NA

NA

NA

NA

NA

B2 (Probable human carcinogen)

IRIS

5/11/2018


-------
TABLE 6.1

CANCER TOXICITY DATA - ORAL/DERMAL
HUMAN HEALTH RISK ASSESSMENT REPORT
OLD WILMINGTON ROAD SITE
WEST CALN TOWNSHIP, CHESTER COUNTY, PENNSYLVANIA
PAGE 2 OF 2

Chemical
of Potential
Concern

Oral Cancer Slope Factor

Oral Absorption
Efficiency

for Dermal*1*

Absorbed Cancer Slope Factor

for Dermal*2*

Weight of Evidence/
Cancer Guideline
Description*3*

Oral CSF

Value

Units

Value

Units

Source(s)

Date(s)<4)
(MSWDD/YYYY)

Manganese

NA

NA

NA

NA

NA

D (Not classifiable as to human
carcinogenicity)

IRIS

5/11/2018

Mercury

NA

NA

NA

NA

NA

D (Not classifiable as to human
carcinogenicity)

IRIS

5/11/2018

Nickel

NA

NA

NA

NA

NA

NA

NA

NA

Selenium

NA

NA

NA

NA

NA

D (Not classifiable as to human
carcinogenicity)

IRIS

5/11/2018

Thallium

NA

NA

NA

NA

NA

Inadequate information to assess carcinogenic
potential

IRIS

5/11/2018

Vanadium

NA

NA

NA

NA

NA

NA

NA

NA

Zinc

NA

NA

NA

NA

NA

Inadequate information to assess carcinogenic
potential

IRIS

5/11/2018

Footnotes:

1	- USEPA, 2004: Risk Assessment Guidance for Superfund (Part E, Supplemental Guidance for Dermal Risk Assessment) Final. EPA/540/R/99/005.

2	- Weight of evidence description is the most recent one presented in IRIS.

3	- Adjusted cancer slope factor for dermal = Oral cancer slope factor / Oral absorption efficiency for dermal.

4	- Dates for IRIS are the date the databases was searched. The dates for Cal EPA are the dates of the reference documents containing the toxicity values.

5	- Trichloroethene, benzo(a)pyrene, and hexavalent chromium are considered to act via the mutagenic mode of action. These chemicals are evaluated in accordance with USEPA's

for Assessing Susceptibility from Early-Life Exposure to Carcinogens (March 2005).

Definitions:

Cal EPA = California Environmental Protection Agency.

IRIS = Integrated Risk Information System.

NA = Not Available.


-------
TABLE 6.2
CANCER TOXICITY DATA - INHALATION
HUMAN HEALTH RISK ASSESSMENT REPORT
OLD WILMINGTON ROAD SITE
WEST CALN TOWNSHIP, CHESTER COUNTY, PENNSYLVANIA

PAGE 1 OF 2

Chemical

Unit Risk

Weight of Evidence/

Unit Risk : Inhalation CSF

of Potential





Cancer Guideline





Concern

Value

Units

Description11'

Source(s)

Date(s)'2'
(MM/DD/YYYY)

Volatile Organic Compounds

1,2,4-T rimethylbenzene

NA

NA

Inadequate information to assess
carcinogenic potential

IRIS

5/11/2018

2-Butanone

NA

NA

Data are inadequate for an assessment of
human carcinogenic potential

IRIS

5/11/2018

2-Hexanone

NA

NA

Inadequate information to assess
carcinogenic potential

IRIS

5/11/2018

Chloroform

2.3E-05

(ug/m3)"1

Likely to be carcinogenic to humans

IRIS

5/11/2018

cis-1,2-Dichloroethene

NA

NA

Inadequate information to assess
carcinogenic potential

IRIS

5/11/2018

Methyl Tert-Butyl Ether

2.6E-07

(ug/m3)"1

NA

Cal EPA

6/2009

Tetrachloroethene

2.6E-07

(ug/m3)"1

Likely to be carcinogenic to humans

IRIS

5/11/2018

Trichloroethene (Mutagenic)'3'

1.0E-06

(ug/m3)"1

Carcinogenic to humans

IRIS

5/11/2018

Trichloroethene (Nonmutagenic)

3.1E-06

(ug/m3)"1

Carcinogenic to humans

IRIS

5/11/2018

Vinyl Chloride

4.4E-06

(ug/m3)"1

Known/likely human carcinogen

IRIS

5/11/2018

Semivolatile Organic Compounds

1,4-Dioxane

5.0E-06

(ug/m3)"1

Likely to be carcinogenic to humans

IRIS

5/11/2018

Benzo(a)pyrene(3)

6.0E-04

(ug/m3)"1

Carcinogenic to humans

IRIS

5/11/2018

Bis(2-ethylhexyl)phthalate

2.4E-06

(ug/m3)"1

B2 (Probable human carcinogen)

Cal EPA

6/2009

Caprolactam

NA

NA

NA

NA

NA

Naphthalene

3.4E-05

(ug/m3)"1

Carcinogenic potential cannot be
determined

Cal EPA

6/2009

Pesticides/PCBs

Dieldrin

4.6E-03

(ug/m3)"1

B2 (Probable human carcinogen)

IRIS

5/11/2018

Inorganics

Aluminum

NA

NA

NA

NA

NA

Antimony

NA

NA

NA

NA

NA

Arsenic

4.3E-03

(ug/m3)"1

A (Known human carcinogen)

IRIS

5/11/2018

Barium

NA

NA

Carcinogenic potential cannot be
determined

IRIS

5/11/2018


-------
TABLE 6.2
CANCER TOXICITY DATA - INHALATION
HUMAN HEALTH RISK ASSESSMENT REPORT
OLD WILMINGTON ROAD SITE
WEST CALN TOWNSHIP, CHESTER COUNTY, PENNSYLVANIA

PAGE 2 OF 2

Chemical
of Potential
Concern

Unit Risk

Weight of Evidence/
Cancer Guideline
Description11'

Unit Risk : Inhalation CSF

Value

Units

Source(s)

Date(s)12'
(MM/DD/YYYY)

Beryllium

2.4E-03

(ug/m3)"1

Known/likely human carcinogen

IRIS

5/11/2018

Cadmium

1.8E-03

(ug/m3)"1

B1 (Probable human carcinogen)

IRIS

5/11/2018

Cobalt

9.0E-03

(ug/m3)"1

NA

PPRTV

8/25/2008

Copper

NA

NA

D (Not classifiable as to human
carcinogenicity)

IRIS

5/11/2018

Iron

NA

NA

NA

NA

NA

Lead

NA

NA

B2 (Probable human carcinogen)

IRIS

5/11/2018

Manganese

NA

NA

D (Not classifiable as to human
carcinogenicity)

IRIS

5/11/2018

Mercury

NA

NA

D (Not classifiable as to human
carcinogenicity)

IRIS

5/11/2018

Nickel

2.6E-04

(ug/m3)"1

NA

Cal EPA

6/2009

Selenium

NA

NA

D (Not classifiable as to human
carcinogenicity)

IRIS

5/11/2018

Thallium

NA

NA

Inadequate information to assess
carcinogenic potential

IRIS

5/11/2018

Vanadium

NA

NA

NA

NA

NA

Zinc

NA

NA

Inadequate information to assess
carcinogenic potential

IRIS

5/11/2018

Footnotes:

1	- Weight of evidence description is the most recent one presented in IRIS.

2	- Dates for IRIS and PPRTV are the dates the databases were searched. The dates for Cal EPA is the date of the reference document containing the toxicity values

3	- Trichloroethene, benzo(a)pyrene, and hexavalent chromium are considered to act via the mutagenic mode of action. These chemicals are evaluated in accordanc

Supplemental Guidance for Assessing Susceptibility from Early-Life Exposure to Carcinogens (March 2005).

Definitions:

Cal EPA = California Environmental Protection Agency, Technical Support Document for Cancer Potency Factors, 2009.

IRIS = Integrated Risk Information System.

NA = Not Available.

PPRTV = Provisional Peer Reviewed Toxicity Value.


-------
RAGS Part D Table 7
Calculation of Cancer Risks and Non-Cancer Hazards


-------
LIST OF TABLES
RAGS PART D TABLE 7
CALCULATION OF CHEMICAL CANCER RISKS AND NON-CANCER HAZARDS

Table No.

Reasonable Maximum Exposuri

7.1 .RME	Current Industrial Workers

7.2.RME	Current Child Residents

7.3.RME	Current Adult Residents

7.4.RME	Current Lifelong Residents

7.5.RME	Future Construction Workers

7.6.RME	Future Industrial Workers

7.7.RME	Future Child Residents

7.8.RME	Future Adult Residents

7.9.RME	Future Lifelong Residents

Central Tendency Exposures

7

1

o

—I
m

Current Industrial Workers

7

2

o

—i
m

Current Child Residents

7

3

o

—i
m

Current Adult Residents

7

4

o

—i
m

Current Lifelong Residents

7

5

o

—i
m

Future Construction Workers

7

6

o

—i
m

Future Industrial Workers

7

7

o

—i
m

Future Child Residents

7

8

o

—i
m

Future Adult Residents

7

9

o

—i
m

Future Lifelong Residents


-------
TABLE 7.1.RME

CALCULATION OF CHEMICAL CANCER RISKS AND NON-CANCER HAZARDS
REASONABLE MAXIMUM EXPOSURES
OLD WILMINGTON ROAD SITE
PAGE 1 OF 1

Scenario Timeframe: Current

Receptor Population: Industrial Workers

Receptor Age: Adult	

Medium

Exposure Medium

Exposure Point

Exposure Route

Chemical of

EPC

Cancer Risk Calculations

Non-Cancer Hazard Calculations









Potential Concern

Value

Units

Intake/Exposure Concentration

CSF/Unit Risk

Cancer Risk

Intake/Exposure Concentration

RfD/RfC

Hazard Quotient















Value

Units

Value

Units



Value

Units

Value

Units



Surface Soil

Surface Soil

OWR

Ingestion

Benzo(a)pyrene

0.286

mg/kg

8.7E-08

(mg/kg/day)

1.0E+00

(mg/kg/day)"

8.7E-08

2.4E-07

(mg/kg/day)

3.0E-04

(mg/kg/day)

0.00082









Naphthalene

9.8

mg/kg

3.0E-06

(mg/kg/day)

NA

(mg/kg/day)"



8.4E-06

(mg/kg/day)

2.0E-02

(mg/kg/day)

0.00042









Dieldrin

0.11

mg/kg

3.4E-08

(mg/kg/day)

1.6E+01

(mg/kg/day)"

5.4E-07

9.4E-08

(mg/kg/day)

5.0E-05

(mg/kg/day)

0.0019









Aluminum

12000

mg/kg

3.7E-03

(mg/kg/day)

NA

(mg/kg/day)"



1.0E-02

(mg/kg/day)

1.0E+00

(mg/kg/day)

0.010









Antimony

11.3

mg/kg

3.5E-06

(mg/kg/day)

NA

(mg/kg/day)"



9.7E-06

(mg/kg/day)

4.0E-04

(mg/kg/day)

0.024









Arsenic

5.28

mg/kg

9.7E-07

(mg/kg/day)

1.5E+00

(mg/kg/day)"

1.5E-06

2.7E-06

(mg/kg/day)

3.0E-04

(mg/kg/day)

0.0090









Cobalt

7.59

mg/kg

2.3E-06

(mg/kg/day)

NA

(mg/kg/day)"



6.5E-06

(mg/kg/day)

3.0E-04

(mg/kg/day)

0.022









Copper

1240

mg/kg

3.8E-04

(mg/kg/day)

NA

(mg/kg/day)"



1.1E-03

(mg/kg/day)

4.0E-02

(mg/kg/day)

0.027









Iron

20200

mg/kg

6.2E-03

(mg/kg/day)

NA

(mg/kg/day)"



1.7E-02

(mg/kg/day)

7.0E-01

(mg/kg/day)

0.025









Lead

131

mg/kg

4.0E-05

(mg/kg/day)

NA

(mg/kg/day)"



1.1E-04

(mg/kg/day)

NA

(mg/kg/day)











Manganese

456

mg/kg

1.4E-04

(mg/kg/day)

NA

(mg/kg/day)"



3.9E-04

(mg/kg/day)

2.4E-02

(mg/kg/day)

0.016









Vanadium

27

mg/kg

8.3E-06

(mg/kg/day)

NA

(mg/kg/day)"



2.3E-05

(mg/kg/day)

5.0E-03

(mg/kg/day)

0.0046









Zinc

705

mg/kg

2.2E-04

(mg/kg/day)

NA

(mg/kg/day)"



6.0E-04

(mg/kg/day)

3.0E-01

(mg/kg/day)

0.0020







Exp. Route Total





2.1E-06



0.14







Dermal

Benzo(a)pyrene

0.286

mg/kg

4.8E-08

(mg/kg/day)

1.0E+00

(mg/kg/day)"

4.8E-08

1.3E-07

(mg/kg/day)

3.0E-04

(mg/kg/day)

0.00045









Naphthalene

9.8

mg/kg

1.6E-06

(mg/kg/day)

NA

(mg/kg/day)"



4.6E-06

(mg/kg/day)

2.0E-02

(mg/kg/day)

0.00023









Dieldrin

0.11

mg/kg

1.4E-08

(mg/kg/day)

1.6E+01

(mg/kg/day)"

2.3E-07

4.0E-08

(mg/kg/day)

5.0E-05

(mg/kg/day)

0.00080









Aluminum

12000

mg/kg

1.6E-04

(mg/kg/day)

NA

(mg/kg/day)"



4.3E-04

(mg/kg/day)

1.0E+00

(mg/kg/day)

0.00043









Antimony

11.3

mg/kg

1.5E-07

(mg/kg/day)

NA

(mg/kg/day)"



4.1E-07

(mg/kg/day)

6.0E-05

(mg/kg/day)

0.0068









Arsenic

5.28

mg/kg

2.0E-07

(mg/kg/day)

1.5E+00

(mg/kg/day)"

3.1E-07

5.7E-07

(mg/kg/day)

3.0E-04

(mg/kg/day)

0.0019









Cobalt

7.59

mg/kg

9.8E-08

(mg/kg/day)

NA

(mg/kg/day)"



2.8E-07

(mg/kg/day)

3.0E-04

(mg/kg/day)

0.00092









Copper

1240

mg/kg

1.6E-05

(mg/kg/day)

NA

(mg/kg/day)"



4.5E-05

(mg/kg/day)

4.0E-02

(mg/kg/day)

0.0011









Iron

20200

mg/kg

2.6E-04

(mg/kg/day)

NA

(mg/kg/day)"



7.3E-04

(mg/kg/day)

7.0E-01

(mg/kg/day)

0.0010









Lead

131

mg/kg

0.0E+00

(mg/kg/day)

NA

(mg/kg/day)"



0.0E+00

(mg/kg/day)

NA

(mg/kg/day)











Manganese

456

mg/kg

5.9E-06

(mg/kg/day)

NA

(mg/kg/day)"



1.7E-05

(mg/kg/day)

9.6E-04

(mg/kg/day)

0.017









Vanadium

27

mg/kg

3.5E-07

(mg/kg/day)

NA

(mg/kg/day)"



9.8E-07

(mg/kg/day)

1.3E-04

(mg/kg/day)

0.0075









Zinc

705

mg/kg

9.1E-06

(mg/kg/day)

NA

(mg/kg/day)"



2.6E-05

(mg/kg/day)

3.0E-01

(mg/kg/day)

0.000085







Exp. Route Total





5.8E-07



0.039





Exposure Point Total



2.7E-06



0.18



Exposure Medium Total



2.7E-06



0.18



Air

OWR

Inhalation

Benzo(a)pyrene

8.8E-11

mg/m3

7.2E-12

(mg/m3)

6.0E-04

(ug/m3)"1

4.3E-12

2.0E-11

(mg/m3)

2.0E-06

(mg/m3)

0.000010









Naphthalene

1.7E-04

mg/m3

1.3E-05

(mg/m3)

3.4E-05

(ug/m3)"1

4.6E-07

3.8E-05

(mg/m3)

3.0E-03

(mg/m3)

0.013









Dieldrin

3.4E-11

mg/m3

2.8E-12

(mg/m3)

4.6E-03

(ug/m3)"1

1.3E-11

7.8E-12

(mg/m3)

NA

(mg/m3)











Aluminum

3.7E-06

mg/m

3.0E-07

(mg/m3)

NA

(ug/m3)"1



8.5E-07

(mg/m3)

5.0E-03

(mg/m3)

0.00017









Antimony

3.5E-09

mg/m3

2.8E-10

(mg/m3)

NA

(ug/m3)"1



8.0E-10

(mg/m3)

NA

(mg/m3)











Arsenic

1.6E-09

mg/m3

1.3E-10

(mg/m3)

4.3E-03

(ug/m3)"1

5.7E-10

3.7E-10

(mg/m3)

1.5E-05

(mg/m3)

0.000025









Cobalt

2.3E-09

mg/m3

1.9E-10

(mg/m3)

9.0E-03

(ug/m3)"1

1.7E-09

5.3E-10

(mg/m3)

6.0E-06

(mg/m3)

0.000089









Copper

3.8E-07

mg/m3

3.1E-08

(mg/m3)

NA

(ug/m3)"1



8.7E-08

(mg/m3)

NA

(mg/m3)











Iron

6.2E-06

mg/m3

5.1E-07

(mg/m3)

NA

(ug/m3)"1



1.4E-06

(mg/m3)

NA

(mg/m3)











Lead

4.0E-08

mg/m3

3.3E-09

(mg/m3)

NA

(ug/m3)"1



9.2E-09

(mg/m3)

NA

(mg/m3)











Manganese

1.4E-07

mg/m3

1.1E-08

(mg/m3)

NA

(ug/m3)"1



3.2E-08

(mg/m3)

5.0E-05

(mg/m3)

0.00064









Vanadium

8.3E-09

mg/m3

6.8E-10

(mg/m3)

NA

(ug/m3)"1



1.9E-09

(mg/m3)

1.0E-04

(mg/m3)

0.000019









Zinc

2.2E-07

mg/m3

1.8E-08

(mg/m3)

NA

(ug/m3)"1



5.0E-08

(mg/m3)

NA

(mg/m3)









Exp. Route Total





4.6E-07



0.014





Exposure Point Total



4.6E-07



0.014



Exposure Medium Total



4.6E-07



0.014

Medium Total



3.1E-06



0.19

Total of Receptor Risks Across All Media

3.1E-06

Total of Receptor Hazards Across All Media

0.19

Notes:

1 - Mutagenic chemicals were evaluated in accordance with USEPA's Supplemental Guidance for Assessing Susceptibility from Early-Life Exposure to Carcinogens (2005).


-------
TABLE 7.2.RME

CALCULATION OF CHEMICAL CANCER RISKS AND NON-CANCER HAZARDS
REASONABLE MAXIMUM EXPOSURES
OLD WILMINGTON ROAD SITE
PAGE 1 OF 2

Scenario Timeframe: Current
Receptor Population: Residents

Receptor Age: Child	

Medium

Exposure Medium

Exposure Point

Exposure Route

Chemical of

EPC

Cancer Risk Calculations

Non-Cancer Hazard Calculations









Potential Concern

Value

Units

Intake/Exposure Concentration

CSF/Unit Risk

Cancer Risk

Intake/Exposure Concentration

RfD/RfC

Hazard Quotient















Value

Units

Value

Units



Value

Units

Value

Units



Surface Soil

Surface Soil

OWR

Ingestion

Benzo(a)pyrene

0.286

mg/kg

1.7E-06

(mg/kg/day)

1.0E+00

(mg/kg/day)"

1.7E-06

3.7E-06

(mg/kg/day)

3.0E-04

(mg/kg/day)

0.012









Naphthalene

9.8

mg/kg

1.1E-05

(mg/kg/day)

NA

(mg/kg/day)"



1.3E-04

(mg/kg/day)

2.0E-02

(mg/kg/day)

0.0063









Dieldrin

0.11

mg/kg

1.2E-07

(mg/kg/day)

1.6E+01

(mg/kg/day)"

1.9E-06

1.4E-06

(mg/kg/day)

5.0E-05

(mg/kg/day)

0.028









Aluminum

12000

mg/kg

1.3E-02

(mg/kg/day)

NA

(mg/kg/day)"



1.5E-01

(mg/kg/day)

1.0E+00

(mg/kg/day)

0.15









Antimony

11.3

mg/kg

1.2E-05

(mg/kg/day)

NA

(mg/kg/day)"



1.4E-04

(mg/kg/day)

4.0E-04

(mg/kg/day)

0.36









Arsenic

5.28

mg/kg

3.5E-06

(mg/kg/day)

1.5E+00

(mg/kg/day)"

5.2E-06

4.1E-05

(mg/kg/day)

3.0E-04

(mg/kg/day)

0.14









Cobalt

7.59

mg/kg

8.3E-06

(mg/kg/day)

NA

(mg/kg/day)"



9.7E-05

(mg/kg/day)

3.0E-04

(mg/kg/day)

0.32









Copper

1240

mg/kg

1.4E-03

(mg/kg/day)

NA

(mg/kg/day)"



1.6E-02

(mg/kg/day)

4.0E-02

(mg/kg/day)

0.40









Iron

20200

mg/kg

2.2E-02

(mg/kg/day)

NA

(mg/kg/day)"



2.6E-01

(mg/kg/day)

7.0E-01

(mg/kg/day)

0.37









Lead

131

mg/kg

1.4E-04

(mg/kg/day)

NA

(mg/kg/day)"



1.7E-03

(mg/kg/day)

NA

(mg/kg/day)











Manganese

456

mg/kg

5.0E-04

(mg/kg/day)

NA

(mg/kg/day)"



5.8E-03

(mg/kg/day)

2.4E-02

(mg/kg/day)

0.24









Vanadium

27

mg/kg

3.0E-05

(mg/kg/day)

NA

(mg/kg/day)"



3.5E-04

(mg/kg/day)

5.0E-03

(mg/kg/day)

0.069









Zinc

705

mg/kg

7.7E-04

(mg/kg/day)

NA

(mg/kg/day)"



9.0E-03

(mg/kg/day)

3.0E-01

(mg/kg/day)

0.030







Exp. Route Total





8.8E-06



2.1







Dermal

Benzo(a)pyrene

0.286

mg/kg

5.2E-07

(mg/kg/day)

1.0E+00

(mg/kg/day)"

5.2E-07

1.1E-06

(mg/kg/day)

3.0E-04

(mg/kg/day)

0.0038









Naphthalene

9.8

mg/kg

3.3E-06

(mg/kg/day)

NA

(mg/kg/day)"



3.9E-05

(mg/kg/day)

2.0E-02

(mg/kg/day)

0.0019









Dieldrin

0.11

mg/kg

2.9E-08

(mg/kg/day)

1.6E+01

(mg/kg/day)"

4.6E-07

3.3E-07

(mg/kg/day)

5.0E-05

(mg/kg/day)

0.0067









Aluminum

12000

mg/kg

3.1E-04

(mg/kg/day)

NA

(mg/kg/day)"



3.6E-03

(mg/kg/day)

1.0E+00

(mg/kg/day)

0.0036









Antimony

11.3

mg/kg

2.9E-07

(mg/kg/day)

NA

(mg/kg/day)"



3.4E-06

(mg/kg/day)

6.0E-05

(mg/kg/day)

0.057









Arsenic

5.28

mg/kg

4.1E-07

(mg/kg/day)

1.5E+00

(mg/kg/day)"

6.2E-07

4.8E-06

(mg/kg/day)

3.0E-04

(mg/kg/day)

0.016









Cobalt

7.59

mg/kg

2.0E-07

(mg/kg/day)

NA

(mg/kg/day)"



2.3E-06

(mg/kg/day)

3.0E-04

(mg/kg/day)

0.0077









Copper

1240

mg/kg

3.2E-05

(mg/kg/day)

NA

(mg/kg/day)"



3.8E-04

(mg/kg/day)

4.0E-02

(mg/kg/day)

0.0094









Iron

20200

mg/kg

5.3E-04

(mg/kg/day)

NA

(mg/kg/day)"



6.1E-03

(mg/kg/day)

7.0E-01

(mg/kg/day)

0.0088









Lead

131

mg/kg

0.0E+00

(mg/kg/day)

NA

(mg/kg/day)"



0.0E+00

(mg/kg/day)

NA

(mg/kg/day)











Manganese

456

mg/kg

1.2E-05

(mg/kg/day)

NA

(mg/kg/day)"



1.4E-04

(mg/kg/day)

9.6E-04

(mg/kg/day)

0.14









Vanadium

27

mg/kg

7.0E-07

(mg/kg/day)

NA

(mg/kg/day)"



8.2E-06

(mg/kg/day)

1.3E-04

(mg/kg/day)

0.063









Zinc

705

mg/kg

1.8E-05

(mg/kg/day)

NA

(mg/kg/day)"



2.1E-04

(mg/kg/day)

3.0E-01

(mg/kg/day)

0.00071







Exp. Route Total





1.6E-06



0.32





Exposure Point Total



1.0E-05



2.4



Exposure Medium Total



1.0E-05



2.4



Air

OWR

Inhalation

Benzo(a)pyrene

8.8E-11

mg/m3

3.9E-11

(mg/m3)

6.0E-04

(ug/m3)"1

2.3E-11

8.5E-11

(mg/m3)

2.0E-06

(mg/m3)

0.000042









Naphthalene

1.7E-04

mg/m3

1.4E-05

(mg/m3)

3.4E-05

(ug/m3)"1

4.6E-07

1.6E-04

(mg/m3)

3.0E-03

(mg/m3)

0.053









Dieldrin

3.4E-11

mg/m3

2.8E-12

(mg/m3)

4.6E-03

(ug/m3)"1

1.3E-11

3.3E-11

(mg/m3)

NA

(mg/m3)











Aluminum

3.7E-06

mg/m

3.0E-07

(mg/m3)

NA

(ug/m3)"1



3.6E-06

(mg/m3)

5.0E-03

(mg/m3)

0.00071









Antimony

3.5E-09

mg/m3

2.9E-10

(mg/m3)

NA

(ug/m3)"1



3.3E-09

(mg/m3)

NA

(mg/m3)











Arsenic

1.6E-09

mg/m3

1.3E-10

(mg/m3)

4.3E-03

(ug/m3)"1

5.8E-10

1.6E-09

(mg/m3)

1.5E-05

(mg/m3)

0.00010









Cobalt

2.3E-09

mg/m3

1.9E-10

(mg/m3)

9.0E-03

(ug/m3)"1

1.7E-09

2.2E-09

(mg/m3)

6.0E-06

(mg/m3)

0.00037









Copper

3.8E-07

mg/m3

3.1E-08

(mg/m3)

NA

(ug/m3)"1



3.7E-07

(mg/m3)

NA

(mg/m3)











Iron

6.2E-06

mg/m3

5.1E-07

(mg/m3)

NA

(ug/m3)"1



6.0E-06

(mg/m3)

NA

(mg/m3)











Lead

4.0E-08

mg/m3

3.3E-09

(mg/m3)

NA

(ug/m3)"1



3.9E-08

(mg/m3)

NA

(mg/m3)











Manganese

1.4E-07

mg/m3

1.2E-08

(mg/m3)

NA

(ug/m3)"1



1.3E-07

(mg/m3)

5.0E-05

(mg/m3)

0.0027









Vanadium

8.3E-09

mg/m3

6.8E-10

(mg/m3)

NA

(ug/m3)"1



8.0E-09

(mg/m3)

1.0E-04

(mg/m3)

0.000080









Zinc

2.2E-07

mg/m3

1.8E-08

(mg/m3)

NA

(ug/m3)"1



2.1E-07

(mg/m3)

NA

(mg/m3)









Exp. Route Total





4.6E-07



0.057





Exposure Point Total



4.6E-07



0.057



Exposure Medium Total



4.6E-07



0.057

Medium Total



1.1E-05



2.5


-------
TABLE 7.2.RME

CALCULATION OF CHEMICAL CANCER RISKS AND NON-CANCER HAZARDS
REASONABLE MAXIMUM EXPOSURES
OLD WILMINGTON ROAD SITE
PAGE 2 OF 2

Scenario Timeframe: Current
Receptor Population: Residents

Receptor Age: Child	

Medium

Exposure Medium

Exposure Point

Exposure Route Chemical of

EPC

Cancer Risk Calculations

Non-Cancer Hazard Calculations







Potential Concern

Value

Units

Intake/Exposure Concentration

CSF/Unit Risk

Cancer Risk

Intake/Exposure Concentration

RfD/RfC

Hazard Quotient







|





Value

Units

Value

Units



Value

Units

Value

Units



Sediment

Sediment

OWR

Ingestion Cobalt

14

mg/kg

2.3E-06

(mg/kg/day)

NA

(mg/kg/day)"1



2.7E-05

(mg/kg/day)

3.0E-04

(mg/kg/day)

0.09







[Nickel

1500

mg/kg

2.4E-04

(mg/kg/day)

NA

(mg/kg/day)"1



2.8E-03

(mg/kg/day)

2.0E-02

(mg/kg/day)

0.14





I Exp. Route Total |







0.23







Dermal jCobalt

14

mg/kg

5.4E-08

(mg/kg/day)

NA

(mg/kg/day)"1



6.3E-07

(mg/kg/day)

3.0E-04

(mg/kg/day)

0.00







| Nickel

1500

mg/kg

5.8E-06

(mg/kg/day)

NA

(mg/kg/day)"1



6.8E-05

(mg/kg/day)

8.0E-04

(mg/kg/day)

0.085







Exp. Route Total jj











0.09





Exposure Point Total







0.32



Exposure Medium Total









0.32

Medium Total







0.32

Total of Receptor Risks Across All Media

1.1E-05

Total of Receptor Hazards Across All Media

2.8

Notes:

1 - Mutagenic chemicals were evaluated in accordance with USEPA's Supplemental Guidance for Assessing Susceptibility from Early-Life Exposure to Carcinogens (2005).


-------
TABLE 7.3.RME

CALCULATION OF CHEMICAL CANCER RISKS AND NON-CANCER HAZARDS
REASONABLE MAXIMUM EXPOSURES
OLD WILMINGTON ROAD SITE
PAGE 1 OF 2

Scenario Timeframe: Current
Receptor Population: Residents

Receptor Age: Adult	

Medium

Exposure Medium

Exposure Point

Exposure Route

Chemical of

EPC

Cancer Risk Calculations

Non-Cancer Hazard Calculations









Potential Concern

Value

Units

Intake/Exposure Concentration

CSF/Unit Risk

Cancer Risk

Intake/Exposure Concentration

RfD/RfC

Hazard Quotient















Value

Units

Value

Units



Value

Units

Value

Units



Surface Soil

Surface Soil

OWR

Ingestion

Benzo(a)pyrene

0.286

mg/kg

2.0E-07

(mg/kg/day)

1.0E+00

(mg/kg/day)"

2.0E-07

3.4E-07

(mg/kg/day)

3.0E-04

(mg/kg/day)

0.0011









Naphthalene

9.8

mg/kg

3.4E-06

(mg/kg/day)

NA

(mg/kg/day)"



1.2E-05

(mg/kg/day)

2.0E-02

(mg/kg/day)

0.00059









Dieldrin

0.11

mg/kg

3.8E-08

(mg/kg/day)

1.6E+01

(mg/kg/day)"

6.0E-07

1.3E-07

(mg/kg/day)

5.0E-05

(mg/kg/day)

0.0026









Aluminum

12000

mg/kg

4.1E-03

(mg/kg/day)

NA

(mg/kg/day)"



1.4E-02

(mg/kg/day)

1.0E+00

(mg/kg/day)

0.014









Antimony

11.3

mg/kg

3.9E-06

(mg/kg/day)

NA

(mg/kg/day)"



1.4E-05

(mg/kg/day)

4.0E-04

(mg/kg/day)

0.034









Arsenic

5.28

mg/kg

1.1E-06

(mg/kg/day)

1.5E+00

(mg/kg/day)"

1.6E-06

3.8E-06

(mg/kg/day)

3.0E-04

(mg/kg/day)

0.013









Cobalt

7.59

mg/kg

2.6E-06

(mg/kg/day)

NA

(mg/kg/day)"



9.1E-06

(mg/kg/day)

3.0E-04

(mg/kg/day)

0.030









Copper

1240

mg/kg

4.2E-04

(mg/kg/day)

NA

(mg/kg/day)"



1.5E-03

(mg/kg/day)

4.0E-02

(mg/kg/day)

0.037









Iron

20200

mg/kg

6.9E-03

(mg/kg/day)

NA

(mg/kg/day)"



2.4E-02

(mg/kg/day)

7.0E-01

(mg/kg/day)

0.035









Lead

131

mg/kg

4.5E-05

(mg/kg/day)

NA

(mg/kg/day)"



1.6E-04

(mg/kg/day)

NA

(mg/kg/day)











Manganese

456

mg/kg

1.6E-04

(mg/kg/day)

NA

(mg/kg/day)"



5.5E-04

(mg/kg/day)

2.4E-02

(mg/kg/day)

0.023









Vanadium

27

mg/kg

9.2E-06

(mg/kg/day)

NA

(mg/kg/day)"



3.2E-05

(mg/kg/day)

5.0E-03

(mg/kg/day)

0.0065









Zinc

705

mg/kg

2.4E-04

(mg/kg/day)

NA

(mg/kg/day)"



8.5E-04

(mg/kg/day)

3.0E-01

(mg/kg/day)

0.0028







Exp. Route Total





2.4E-06



0.20







Dermal

Benzo(a)pyrene

0.286

mg/kg

1.1E-07

(mg/kg/day)

1.0E+00

(mg/kg/day)"

1.1E-07

1.9E-07

(mg/kg/day)

3.0E-04

(mg/kg/day)

0.00063









Naphthalene

9.8

mg/kg

1.8E-06

(mg/kg/day)

NA

(mg/kg/day)"



6.4E-06

(mg/kg/day)

2.0E-02

(mg/kg/day)

0.00032









Dieldrin

0.11

mg/kg

1.6E-08

(mg/kg/day)

1.6E+01

(mg/kg/day)"

2.5E-07

5.6E-08

(mg/kg/day)

5.0E-05

(mg/kg/day)

0.0011









Aluminum

12000

mg/kg

1.7E-04

(mg/kg/day)

NA

(mg/kg/day)"



6.1E-04

(mg/kg/day)

1.0E+00

(mg/kg/day)

0.00061









Antimony

11.3

mg/kg

1.6E-07

(mg/kg/day)

NA

(mg/kg/day)"



5.7E-07

(mg/kg/day)

6.0E-05

(mg/kg/day)

0.0095









Arsenic

5.28

mg/kg

2.3E-07

(mg/kg/day)

1.5E+00

(mg/kg/day)"

3.4E-07

8.0E-07

(mg/kg/day)

3.0E-04

(mg/kg/day)

0.0027









Cobalt

7.59

mg/kg

1.1E-07

(mg/kg/day)

NA

(mg/kg/day)"



3.8E-07

(mg/kg/day)

3.0E-04

(mg/kg/day)

0.0013









Copper

1240

mg/kg

1.8E-05

(mg/kg/day)

NA

(mg/kg/day)"



6.3E-05

(mg/kg/day)

4.0E-02

(mg/kg/day)

0.0016









Iron

20200

mg/kg

2.9E-04

(mg/kg/day)

NA

(mg/kg/day)"



1.0E-03

(mg/kg/day)

7.0E-01

(mg/kg/day)

0.0015









Lead

131

mg/kg

0.0E+00

(mg/kg/day)

NA

(mg/kg/day)"



0.0E+00

(mg/kg/day)

NA

(mg/kg/day)











Manganese

456

mg/kg

6.6E-06

(mg/kg/day)

NA

(mg/kg/day)"



2.3E-05

(mg/kg/day)

9.6E-04

(mg/kg/day)

0.024









Vanadium

27

mg/kg

3.9E-07

(mg/kg/day)

NA

(mg/kg/day)"



1.4E-06

(mg/kg/day)

1.3E-04

(mg/kg/day)

0.011









Zinc

705

mg/kg

1.0E-05

(mg/kg/day)

NA

(mg/kg/day)"



3.6E-05

(mg/kg/day)

3.0E-01

(mg/kg/day)

0.00012







Exp. Route Total





7.1E-07



0.054





Exposure Point Total



3.1E-06



0.25



Exposure Medium Total



3.1E-06



0.25



Air

OWR

Inhalation

Benzo(a)pyrene

8.8E-11

mg/m3

4.8E-11

(mg/m3)

6.0E-04

(ug/m3)"1

2.9E-11

8.5E-11

(mg/m3)

2.0E-06

(mg/m3)

0.000042









Naphthalene

1.7E-04

mg/m3

4.5E-05

(mg/m3)

3.4E-05

(ug/m3)"1

1.5E-06

1.6E-04

(mg/m3)

3.0E-03

(mg/m3)

0.053









Dieldrin

3.4E-11

mg/m3

9.3E-12

(mg/m3)

4.6E-03

(ug/m3)"1

4.3E-11

3.3E-11

(mg/m3)

NA

(mg/m3)











Aluminum

3.7E-06

mg/m

1.0E-06

(mg/m3)

NA

(ug/m3)"1



3.6E-06

(mg/m3)

5.0E-03

(mg/m3)

0.00071









Antimony

3.5E-09

mg/m3

9.6E-10

(mg/m3)

NA

(ug/m3)"1



3.3E-09

(mg/m3)

NA

(mg/m3)











Arsenic

1.6E-09

mg/m3

4.5E-10

(mg/m3)

4.3E-03

(ug/m3)"1

1.9E-09

1.6E-09

(mg/m3)

1.5E-05

(mg/m3)

0.00010









Cobalt

2.3E-09

mg/m3

6.4E-10

(mg/m3)

9.0E-03

(ug/m3)"1

5.8E-09

2.2E-09

(mg/m3)

6.0E-06

(mg/m3)

0.00037









Copper

3.8E-07

mg/m3

1.0E-07

(mg/m3)

NA

(ug/m3)"1



3.7E-07

(mg/m3)

NA

(mg/m3)











Iron

6.2E-06

mg/m3

1.7E-06

(mg/m3)

NA

(ug/m3)"1



6.0E-06

(mg/m3)

NA

(mg/m3)











Lead

4.0E-08

mg/m3

1.1E-08

(mg/m3)

NA

(ug/m3)"1



3.9E-08

(mg/m3)

NA

(mg/m3)











Manganese

1.4E-07

mg/m3

3.9E-08

(mg/m3)

NA

(ug/m3)"1



1.3E-07

(mg/m3)

5.0E-05

(mg/m3)

0.0027









Vanadium

8.3E-09

mg/m3

2.3E-09

(mg/m3)

NA

(ug/m3)"1



8.0E-09

(mg/m3)

1.0E-04

(mg/m3)

0.000080









Zinc

2.2E-07

mg/m3

6.0E-08

(mg/m3)

NA

(ug/m3)"1



2.1E-07

(mg/m3)

NA

(mg/m3)









Exp. Route Total





1.5E-06



0.057





Exposure Point Total



1.5E-06



0.057



Exposure Medium Total



1.5E-06



0.057

Medium Total



4.7E-06



0.31


-------
TABLE 7.3.RME

CALCULATION OF CHEMICAL CANCER RISKS AND NON-CANCER HAZARDS
REASONABLE MAXIMUM EXPOSURES
OLD WILMINGTON ROAD SITE
PAGE 2 OF 2

Scenario Timeframe: Current
Receptor Population: Residents

Receptor Age: Adult	

Medium

Exposure Medium

Exposure Point

Exposure Route Chemical of

EPC

Cancer Risk Calculations

Non-Cancer Hazard Calculations







Potential Concern

Value

Units

Intake/Exposure Concentration

CSF/Unit Risk

Cancer Risk

Intake/Exposure Concentration

RfD/RfC

Hazard Quotient







|





Value

Units

Value

Units



Value

Units

Value

Units



Sediment

Sediment

OWR

Ingestion Cobalt

14

mg/kg

7.1E-07

(mg/kg/day)

NA

(mg/kg/day)"1



2.5E-06

(mg/kg/day)

3.0E-04

(mg/kg/day)

0.008







[Nickel

1500

mg/kg

7.6E-05

(mg/kg/day)

NA

(mg/kg/day)"1



2.7E-04

(mg/kg/day)

2.0E-02

(mg/kg/day)

0.013





I Exp. Route Total |







0.022







Dermal jCobalt

14

mg/kg

3.0E-08

(mg/kg/day)

NA

(mg/kg/day)"1



1.1E-07

(mg/kg/day)

3.0E-04

(mg/kg/day)

0.000







| Nickel

1500

mg/kg

3.2E-06

(mg/kg/day)

NA

(mg/kg/day)"1



1.1E-05

(mg/kg/day)

8.0E-04

(mg/kg/day)

0.014







Exp. Route Total jj











0.014





Exposure Point Total







0.036



Exposure Medium Total









0.036

Medium Total







0.036

Total of Receptor Risks Across All Media

4.7E-06

Total of Receptor Hazards Across All Media

0.35

Notes:

1 - Mutagenic chemicals were evaluated in accordance with USEPA's Supplemental Guidance for Assessing Susceptibility from Early-Life Exposure to Carcinogens (2005).


-------
TABLE 7.4.RME

CALCULATION OF CHEMICAL CANCER RISKS AND NON-CANCER HAZARDS
REASONABLE MAXIMUM EXPOSURES
OLD WILMINGTON ROAD SITE
PAGE 1 OF 2

Scenario Timeframe: Current
Receptor Population: Residents

Receptor Age: Lifelong (Child and Adult)	

Medium

Exposure Medium

Exposure Point

Exposure Route

Chemical of

EPC

Cancer Risk Calculations

Non-Cancer Hazard Calculations









Potential Concern

Value

Units

Intake/Exposure Concentration

CSF/Unit Risk

Cancer Risk

Intake/Exposure Concentration

RfD/RfC

Hazard Quotient















Value

Units

Value

Units



Value

Units

Value

Units



Surface Soil

Surface Soil

OWR

Ingestion

Benzo(a)pyrene

0.286

mg/kg

1.9E-06

(mg/kg/day)

1.0E+00

(mg/kg/day)"

1.9E-06

See Tables 7.2.RME and 7.3.RME for Hazard Indices









Naphthalene

9.8

mg/kg

1.4E-05

(mg/kg/day)

NA

(mg/kg/day)"





















Dieldrin

0.11

mg/kg

1.6E-07

(mg/kg/day)

1.6E+01

(mg/kg/day)"

2.5E-06



















Aluminum

12000

mg/kg

1.7E-02

(mg/kg/day)

NA

(mg/kg/day)"





















Antimony

11.3

mg/kg

1.6E-05

(mg/kg/day)

NA

(mg/kg/day)"





















Arsenic

5.28

mg/kg

4.6E-06

(mg/kg/day)

1.5E+00

(mg/kg/day)"

6.8E-06



















Cobalt

7.59

mg/kg

1.1E-05

(mg/kg/day)

NA

(mg/kg/day)"





















Copper

1240

mg/kg

1.8E-03

(mg/kg/day)

NA

(mg/kg/day)"





















Iron

20200

mg/kg

2.9E-02

(mg/kg/day)

NA

(mg/kg/day)"





















Lead

131

mg/kg

1.9E-04

(mg/kg/day)

NA

(mg/kg/day)"





















Manganese

456

mg/kg

6.6E-04

(mg/kg/day)

NA

(mg/kg/day)"





















Vanadium

27

mg/kg

3.9E-05

(mg/kg/day)

NA

(mg/kg/day)"





















Zinc

705

mg/kg

1.0E-03

(mg/kg/day)

NA

(mg/kg/day)"



















Exp. Route Total





1.1E-05











Dermal

Benzo(a)pyrene

0.286

mg/kg

6.2E-07

(mg/kg/day)

1.0E+00

(mg/kg/day)"

6.2E-07



















Naphthalene

9.8

mg/kg

5.2E-06

(mg/kg/day)

NA

(mg/kg/day)"





















Dieldrin

0.11

mg/kg

4.5E-08

(mg/kg/day)

1.6E+01

(mg/kg/day)"

7.1E-07



















Aluminum

12000

mg/kg

4.9E-04

(mg/kg/day)

NA

(mg/kg/day)"





















Antimony

11.3

mg/kg

4.6E-07

(mg/kg/day)

NA

(mg/kg/day)"





















Arsenic

5.28

mg/kg

6.4E-07

(mg/kg/day)

1.5E+00

(mg/kg/day)"

9.6E-07



















Cobalt

7.59

mg/kg

3.1E-07

(mg/kg/day)

NA

(mg/kg/day)"





















Copper

1240

mg/kg

5.0E-05

(mg/kg/day)

NA

(mg/kg/day)"





















Iron

20200

mg/kg

8.2E-04

(mg/kg/day)

NA

(mg/kg/day)"





















Lead

131

mg/kg

0.0E+00

(mg/kg/day)

NA

(mg/kg/day)"





















Manganese

456

mg/kg

1.8E-05

(mg/kg/day)

NA

(mg/kg/day)"





















Vanadium

27

mg/kg

1.1E-06

(mg/kg/day)

NA

(mg/kg/day)"





















Zinc

705

mg/kg

2.9E-05

(mg/kg/day)

NA

(mg/kg/day)"



















Exp. Route Total





2.3E-06









Exposure Point Total



1.4E-05







Exposure Medium Total



1.4E-05







Air

OWR

Inhalation

Benzo(a)pyrene

8.8E-11

mg/m3

8.7E-11

(mg/m3)

6.0E-04

(ug/m3)"1

5.2E-11



















Naphthalene

1.7E-04

mg/m3

5.9E-05

(mg/m3)

3.4E-05

(ug/m3)"1

2.0E-06



















Dieldrin

3.4E-11

mg/m3

1.2E-11

(mg/m3)

4.6E-03

(ug/m3)"1

5.6E-11



















Aluminum

3.7E-06

mg/m3

1.3E-06

(mg/m3)

NA

(ug/m3)"1





















Antimony

3.5E-09

mg/m3

1.2E-09

(mg/m3)

NA

(ug/m3)"1





















Arsenic

1.6E-09

mg/m3

5.8E-10

(mg/m3)

4.3E-03

(ug/m3)"1

2.5E-09



















Cobalt

2.3E-09

mg/m3

8.3E-10

(mg/m3)

9.0E-03

(ug/m3)"1

7.5E-09



















Copper

3.8E-07

mg/m3

1.4E-07

(mg/m3)

NA

(ug/m3)"1





















Iron

6.2E-06

mg/m3

2.2E-06

(mg/m3)

NA

(ug/m3)"1





















Lead

4.0E-08

mg/m3

1.4E-08

(mg/m3)

NA

(ug/m3)"1





















Manganese

1.4E-07

mg/m3

5.0E-08

(mg/m3)

NA

(ug/m3)"1





















Vanadium

8.3E-09

mg/m3

3.0E-09

(mg/m3)

NA

(ug/m3)"1





















Zinc

2.2E-07

mg/m3

7.7E-08

(mg/m3)

NA

(ug/m3)"1



















Exp. Route Total





2.0E-06









Exposure Point Total



2.0E-06







Exposure Medium Total



2.0E-06





Medium Total



1.6E-05






-------
TABLE 7.4.RME

CALCULATION OF CHEMICAL CANCER RISKS AND NON-CANCER HAZARDS
REASONABLE MAXIMUM EXPOSURES
OLD WILMINGTON ROAD SITE
PAGE 2 OF 2

Scenario Timeframe: Current
Receptor Population: Residents

Receptor Age: Lifelong (Child and Adult)	

Medium

Exposure Medium

Exposure Point

Exposure Route Chemical of

EPC

Cancer Risk Calculations

Non-Cancer Hazard Calculations







Potential Concern

Value

Units

Intake/Exposure Concentration

CSF/Unit Risk

Cancer Risk

Intake/Exposure Concentration

RfD/RfC

Hazard Quotient







|





Value

Units

Value

Units



Value

Units

Value

Units



Sediment

Sediment

OWR

Ingestion Cobalt

14

mg/kg

3.0E-06

(mg/kg/day)

NA

(mg/kg/day)"1



















[Nickel

1500

mg/kg

3.2E-04

(mg/kg/day)

NA

(mg/kg/day)"1

















I Exp. Route Total |















Dermal jCobalt

14

mg/kg

8.4E-08

(mg/kg/day)

NA

(mg/kg/day)"1



















| Nickel

1500

mg/kg

9.0E-06

(mg/kg/day)

NA

(mg/kg/day)"1



















Exp. Route Total jj

















Exposure Point Total











Exposure Medium Total











Medium Total









Total of Receptor Risks Across All Media

1.6E-05





Notes:

1 - Mutagenic chemicals were evaluated in accordance with USEPA's Supplemental Guidance for Assessing Susceptibility from Early-Life Exposure to Carcinogens (2005).


-------
TABLE 7.5.RME

CALCULATION OF CHEMICAL CANCER RISKS AND NON-CANCER HAZARDS
REASONABLE MAXIMUM EXPOSURES
OLD WILMINGTON ROAD SITE
PAGE 1 OF 3

Scenario Timeframe: Future

Receptor Population: Construction Workers

Receptor Age: Adult	

Medium

Exposure Medium

Exposure Point

Exposure Route

Chemical of

EPC

Cancer Risk Calculations

Non-Cancer Hazard Calculations









Potential Concern

Value

Units

Intake/Exposure Concentration

CSF/Unit Risk

Cancer Risk

Intake/Exposure Concentration

RfD/RfC

Hazard Quotient















Value

Units

Value

Units



Value

Units

Value

Units



Surface/Subsurface Soil

Surface/Subsurface Soil

OWR

Ingestion

Benzo(a)pyrene

0.252

mg/kg

1.0E-08

(mg/kg/day)

1.0E+00

(mg/kg/day)"

1.0E-08

7.1E-07

(mg/kg/day)

3.0E-04

(mg/kg/day)

0.0024









Naphthalene

9.8

mg/kg

4.0E-07

(mg/kg/day)

NA

(mg/kg/day)"



2.8E-05

(mg/kg/day)

6.0E-01

(mg/kg/day)

0.000046









Dieldrin

0.11

mg/kg

4.4E-09

(mg/kg/day)

1.6E+01

(mg/kg/day)"

7.1E-08

3.1E-07

(mg/kg/day)

1.0E-04

(mg/kg/day)

0.0031









Aluminum

9940

mg/kg

4.0E-04

(mg/kg/day)

NA

(mg/kg/day)"



2.8E-02

(mg/kg/day)

1.0E+00

(mg/kg/day)

0.028









Antimony

6.48

mg/kg

2.6E-07

(mg/kg/day)

NA

(mg/kg/day)"



1.8E-05

(mg/kg/day)

4.0E-04

(mg/kg/day)

0.046









Arsenic

3.95

mg/kg

9.6E-08

(mg/kg/day)

1.5E+00

(mg/kg/day)"

1.4E-07

6.7E-06

(mg/kg/day)

3.0E-04

(mg/kg/day)

0.022









Cobalt

6.32

mg/kg

2.6E-07

(mg/kg/day)

NA

(mg/kg/day)"



1.8E-05

(mg/kg/day)

3.0E-03

(mg/kg/day)

0.0060









Copper

660

mg/kg

2.7E-05

(mg/kg/day)

NA

(mg/kg/day)"



1.9E-03

(mg/kg/day)

4.0E-02

(mg/kg/day)

0.047









Iron

19200

mg/kg

7.7E-04

(mg/kg/day)

NA

(mg/kg/day)"



5.4E-02

(mg/kg/day)

7.0E-01

(mg/kg/day)

0.077









Lead

71.4

mg/kg

2.9E-06

(mg/kg/day)

NA

(mg/kg/day)"



2.0E-04

(mg/kg/day)

NA

(mg/kg/day)











Manganese

388

mg/kg

1.6E-05

(mg/kg/day)

NA

(mg/kg/day)"



1.1E-03

(mg/kg/day)

2.4E-02

(mg/kg/day)

0.046









Thallium

2.13

mg/kg

8.6E-08

(mg/kg/day)

NA

(mg/kg/day)"



6.0E-06

(mg/kg/day)

4.0E-05

(mg/kg/day)

0.15









Vanadium

23.6

mg/kg

9.5E-07

(mg/kg/day)

NA

(mg/kg/day)"



6.7E-05

(mg/kg/day)

1.0E-02

(mg/kg/day)

0.0067









Zinc

380

mg/kg

1.5E-05

(mg/kg/day)

NA

(mg/kg/day)"



1.1E-03

(mg/kg/day)

3.0E-01

(mg/kg/day)

0.0036







Exp. Route Total





2.2E-07



0.44







Dermal

Benzo(a)pyrene

0.252

mg/kg

4.2E-09

(mg/kg/day)

1.0E+00

(mg/kg/day)"

4.2E-09

3.0E-07

(mg/kg/day)

3.0E-04

(mg/kg/day)

0.00099









Naphthalene

9.8

mg/kg

1.6E-07

(mg/kg/day)

NA

(mg/kg/day)"



1.2E-05

(mg/kg/day)

6.0E-01

(mg/kg/day)

0.000019









Dieldrin

0.11

mg/kg

1.4E-09

(mg/kg/day)

1.6E+01

(mg/kg/day)"

2.3E-08

1.0E-07

(mg/kg/day)

1.0E-04

(mg/kg/day)

0.00100









Aluminum

9940

mg/kg

1.3E-05

(mg/kg/day)

NA

(mg/kg/day)"



9.0E-04

(mg/kg/day)

1.0E+00

(mg/kg/day)

0.00090









Antimony

6.48

mg/kg

8.4E-09

(mg/kg/day)

NA

(mg/kg/day)"



5.9E-07

(mg/kg/day)

6.0E-05

(mg/kg/day)

0.0098









Arsenic

3.95

mg/kg

1.5E-08

(mg/kg/day)

1.5E+00

(mg/kg/day)"

2.3E-08

1.1E-06

(mg/kg/day)

3.0E-04

(mg/kg/day)

0.0036









Cobalt

6.32

mg/kg

8.2E-09

(mg/kg/day)

NA

(mg/kg/day)"



5.7E-07

(mg/kg/day)

3.0E-03

(mg/kg/day)

0.00019









Copper

660

mg/kg

8.5E-07

(mg/kg/day)

NA

(mg/kg/day)"



6.0E-05

(mg/kg/day)

4.0E-02

(mg/kg/day)

0.0015









Iron

19200

mg/kg

2.5E-05

(mg/kg/day)

NA

(mg/kg/day)"



1.7E-03

(mg/kg/day)

7.0E-01

(mg/kg/day)

0.0025









Lead

71.4

mg/kg

0.0E+00

(mg/kg/day)

NA

(mg/kg/day)"



0.0E+00

(mg/kg/day)

NA

(mg/kg/day)











Manganese

388

mg/kg

5.0E-07

(mg/kg/day)

NA

(mg/kg/day)"



3.5E-05

(mg/kg/day)

9.6E-04

(mg/kg/day)

0.037









Thallium

2.13

mg/kg

2.8E-09

(mg/kg/day)

NA

(mg/kg/day)"



1.9E-07

(mg/kg/day)

4.0E-05

(mg/kg/day)

0.0048









Vanadium

23.6

mg/kg

3.1E-08

(mg/kg/day)

NA

(mg/kg/day)"



2.1E-06

(mg/kg/day)

2.6E-04

(mg/kg/day)

0.0082









Zinc

380

mg/kg

4.9E-07

(mg/kg/day)

NA

(mg/kg/day)"



3.4E-05

(mg/kg/day)

3.0E-01

(mg/kg/day)

0.00011







Exp. Route Total





5.0E-08



0.070





Exposure Point Total



2.7E-07



0.51



Exposure Medium Total



2.7E-07



0.51



Air

OWR

Inhalation

Benzo(a)pyrene

1.8E-07

mg/m3

5.9E-10

(mg/m3)

6.0E-04

(ug/m3)"1

3.5E-10

4.1E-08

(mg/m3)

2.0E-06

(mg/m3)

0.021









Naphthalene

9.6E-04

mg/m3

3.1E-06

(mg/m3)

3.4E-05

(ug/m3)"1

1.1E-07

2.2E-04

(mg/m3)

3.0E-03

(mg/m3)

0.073









Dieldrin

7.9E-08

mg/m3

2.6E-10

(mg/m3)

4.6E-03

(ug/m3)"1

1.2E-09

1.8E-08

(mg/m3)

NA

(mg/m3)











Aluminum

7.1E-03

mg/m3

2.3E-05

(mg/m3)

NA

(ug/m3)"1



1.6E-03

(mg/m3)

5.0E-03

(mg/m3)

0.32









Antimony

4.6E-06

mg/m3

1.5E-08

(mg/m3)

NA

(ug/m3)"1



1.1E-06

(mg/m3)

NA

(mg/m3)











Arsenic

2.8E-06

mg/m3

9.2E-09

(mg/m3)

4.3E-03

(ug/m3)"1

4.0E-08

6.4E-07

(mg/m3)

1.5E-05

(mg/m3)

0.043









Cobalt

4.5E-06

mg/m3

1.5E-08

(mg/m3)

9.0E-03

(ug/m3)"1

1.3E-07

1.0E-06

(mg/m3)

2.0E-05

(mg/m3)

0.052









Copper

4.7E-04

mg/m3

1.5E-06

(mg/m3)

NA

(ug/m3)"1



1.1E-04

(mg/m3)

NA

(mg/m3)











Iron

1.4E-02

mg/m3

4.5E-05

(mg/m3)

NA

(ug/m3)"1



3.1E-03

(mg/m3)

NA

(mg/m3)











Lead

5.1E-05

mg/m3

1.7E-07

(mg/m3)

NA

(ug/m3)"1



1.2E-05

(mg/m3)

NA

(mg/m3)











Manganese

2.8E-04

mg/m3

9.0E-07

(mg/m3)

NA

(ug/m3)"1



6.3E-05

(mg/m3)

5.0E-05

(mg/m3)

1.27









Thallium

1.5E-06

mg/m3

5.0E-09

(mg/m3)

NA

(ug/m3)"1



3.5E-07

(mg/m3)

NA

(mg/m3)











Vanadium

1.7E-05

mg/m

5.5E-08

(mg/m3)

NA

(ug/m3)"1



3.8E-06

(mg/m3)

1.0E-04

(mg/m3)

0.038









Zinc

2.7E-04

mg/m3

8.9E-07

(mg/m3)

NA

(ug/m3)"1



6.2E-05

(mg/m3)

NA

(mg/m3)









Exp. Route Total





2.8E-07



1.8





Exposure Point Total



2.8E-07



1.8



Exposure Medium Total



2.8E-07



1.8

Medium Total



5.5E-07



2.3


-------
TABLE 7.5.RME

CALCULATION OF CHEMICAL CANCER RISKS AND NON-CANCER HAZARDS
REASONABLE MAXIMUM EXPOSURES
OLD WILMINGTON ROAD SITE
PAGE 2 OF 3

Scenario Timeframe: Future

Receptor Population: Construction Workers

Receptor Age: Adult	

Medium

Exposure Medium

Exposure Point

Exposure Route

Chemical of

EPC

Cancer Risk Calculations

Non-Cancer Hazard Calculations









Potential Concern

Value

Units

Intake/Exposure Concentration

CSF/Unit Risk

Cancer Risk

Intake/Exposure Concentration

RfD/RfC

Hazard Quotient















Value

Units

Value

Units



Value

Units

Value

Units



Groundwater

Groundwater

OWR

Ingestion

2-Butanone

2

ug/L

1.5E-09

(mg/kg/day)

NA

(mg/kg/day)"



1.0E-07

(mg/kg/day)

2.0E+00

(mg/kg/day)

5.1 E-8









cis-1,2-Dichloroethene

3.1

ug/L

2.3E-09

(mg/kg/day)

NA

(mg/kg/day)"



1.6E-07

(mg/kg/day)

2.0E-02

(mg/kg/day)

0.0000080









Methyl tert-butyl ether

0.95

ug/L

7.0E-10

(mg/kg/day)

1.8E-03

(mg/kg/day)"

1.3E-12

4.9E-08

(mg/kg/day)

NA

(mg/kg/day)











Trichloroethene

27

ug/L

2.0E-08

(mg/kg/day)

4.6E-02

(mg/kg/day)"

9.1E-10

1.4E-06

(mg/kg/day)

5.0E-04

(mg/kg/day)

0.0028









1,4-Dioxane

3.8

ug/L

2.8E-09

(mg/kg/day)

1.0E-01

(mg/kg/day)"

2.8E-10

2.0E-07

(mg/kg/day)

5.0E-01

(mg/kg/day)

0.00000039









Caprolactam

3.7

ug/L

2.7E-09

(mg/kg/day)

NA

(mg/kg/day)"



1.9E-07

(mg/kg/day)

5.0E-01

(mg/kg/day)

0.00000038









Aluminum

114000

ug/L

8.4E-05

(mg/kg/day)

NA

(mg/kg/day)"



5.9E-03

(mg/kg/day)

1.0E+00

(mg/kg/day)

0.0059









Antimony

0.46

ug/L

3.4E-10

(mg/kg/day)

NA

(mg/kg/day)"



2.4E-08

(mg/kg/day)

4.0E-04

(mg/kg/day)

0.000059









Arsenic

60.1

ug/L

4.4E-08

(mg/kg/day)

1.5E+00

(mg/kg/day)"

6.6E-08

3.1E-06

(mg/kg/day)

3.0E-04

(mg/kg/day)

0.010









Barium

3310

ug/L

2.4E-06

(mg/kg/day)

NA

(mg/kg/day)"



1.7E-04

(mg/kg/day)

2.0E-01

(mg/kg/day)

0.00085









Beryllium

17.8

ug/L

1.3E-08

(mg/kg/day)

NA

(mg/kg/day)"



9.1E-07

(mg/kg/day)

5.0E-03

(mg/kg/day)

0.00018









Cadmium

0.45

ug/L

3.3E-10

(mg/kg/day)

NA

(mg/kg/day)"



2.3E-08

(mg/kg/day)

5.0E-04

(mg/kg/day)

0.000046









Cobalt

12.2

ug/L

9.0E-09

(mg/kg/day)

NA

(mg/kg/day)"



6.3E-07

(mg/kg/day)

3.0E-03

(mg/kg/day)

0.00021









Copper

39.9

ug/L

2.9E-08

(mg/kg/day)

NA

(mg/kg/day)"



2.0E-06

(mg/kg/day)

4.0E-02

(mg/kg/day)

0.000051









Iron

74900

ug/L

5.5E-05

(mg/kg/day)

NA

(mg/kg/day)"



3.8E-03

(mg/kg/day)

7.0E-01

(mg/kg/day)

0.0055









Lead

206

ug/L

1.5E-07

(mg/kg/day)

NA

(mg/kg/day)"



1.1E-05

(mg/kg/day)

NA

(mg/kg/day)











Manganese

1020

ug/L

7.5E-07

(mg/kg/day)

NA

(mg/kg/day)"



5.2E-05

(mg/kg/day)

2.4E-02

(mg/kg/day)

0.0022









Mercury

0.091

ug/L

6.7E-11

(mg/kg/day)

NA

(mg/kg/day)"



4.7E-09

(mg/kg/day)

2.0E-03

(mg/kg/day)

0.0000023









Nickel

15.8

ug/L

1.2E-08

(mg/kg/day)

NA

(mg/kg/day)"



8.1E-07

(mg/kg/day)

2.0E-02

(mg/kg/day)

0.000041









Selenium

1.6

ug/L

1.2E-09

(mg/kg/day)

NA

(mg/kg/day)"



8.2E-08

(mg/kg/day)

5.0E-03

(mg/kg/day)

0.000016









Thallium

2.3

ug/L

1.7E-09

(mg/kg/day)

NA

(mg/kg/day)"



1.2E-07

(mg/kg/day)

4.0E-05

(mg/kg/day)

0.0030









Vanadium

30.5

ug/L

2.2E-08

(mg/kg/day)

NA

(mg/kg/day)"



1.6E-06

(mg/kg/day)

1.0E-02

(mg/kg/day)

0.00016









Zinc

343

ug/L

2.5E-07

(mg/kg/day)

NA

(mg/kg/day)"



1.8E-05

(mg/kg/day)

3.0E-01

(mg/kg/day)

0.000059







Exp. Route Total





6.7E-08



0.031







Dermal

2-Butanone

2

ug/L

8.5E-10

(mg/kg/day)

NA

(mg/kg/day)"



5.9E-08

(mg/kg/day)

2.0E+00

(mg/kg/day)

3.0E-8









cis-1,2-Dichloroethene

3.1

ug/L

1.5E-08

(mg/kg/day)

NA

(mg/kg/day)"



1.0E-06

(mg/kg/day)

2.0E-02

(mg/kg/day)

0.000052









Methyl tert-butyl ether

0.95

ug/L

8.9E-10

(mg/kg/day)

1.8E-03

(mg/kg/day)"

1.6E-12

6.2E-08

(mg/kg/day)

NA

(mg/kg/day)











Trichloroethene

27

ug/L

1.4E-07

(mg/kg/day)

4.6E-02

(mg/kg/day)"

6.6E-09

1.0E-05

(mg/kg/day)

5.0E-04

(mg/kg/day)

0.020









1,4-Dioxane

3.8

ug/L

5.6E-10

(mg/kg/day)

1.0E-01

(mg/kg/day)"

5.6E-11

4.0E-08

(mg/kg/day)

5.0E-01

(mg/kg/day)

7.9E-8









Caprolactam

3.7

ug/L

1.7E-09

(mg/kg/day)

NA

(mg/kg/day)"



1.2E-07

(mg/kg/day)

5.0E-01

(mg/kg/day)

0.00000024









Aluminum

114000

ug/L

4.7E-05

(mg/kg/day)

NA

(mg/kg/day)"



3.3E-03

(mg/kg/day)

1.0E+00

(mg/kg/day)

0.0033









Antimony

0.46

ug/L

1.9E-10

(mg/kg/day)

NA

(mg/kg/day)"



1.3E-08

(mg/kg/day)

6.0E-05

(mg/kg/day)

0.00022









Arsenic

60.1

ug/L

2.5E-08

(mg/kg/day)

1.5E+00

(mg/kg/day)"

3.7E-08

1.7E-06

(mg/kg/day)

3.0E-04

(mg/kg/day)

0.0058









Barium

3310

ug/L

1.4E-06

(mg/kg/day)

NA

(mg/kg/day)"



9.6E-05

(mg/kg/day)

1.4E-02

(mg/kg/day)

0.0069









Beryllium

17.8

ug/L

7.4E-09

(mg/kg/day)

NA

(mg/kg/day)"



5.2E-07

(mg/kg/day)

3.5E-05

(mg/kg/day)

0.015









Cadmium

0.45

ug/L

1.9E-10

(mg/kg/day)

NA

(mg/kg/day)"



1.3E-08

(mg/kg/day)

2.5E-05

(mg/kg/day)

0.00052









Cobalt

12.2

ug/L

2.0E-09

(mg/kg/day)

NA

(mg/kg/day)"



1.4E-07

(mg/kg/day)

3.0E-03

(mg/kg/day)

0.000047









Copper

39.9

ug/L

1.7E-08

(mg/kg/day)

NA

(mg/kg/day)"



1.2E-06

(mg/kg/day)

4.0E-02

(mg/kg/day)

0.000029









Iron

74900

ug/L

3.1E-05

(mg/kg/day)

NA

(mg/kg/day)"



2.2E-03

(mg/kg/day)

7.0E-01

(mg/kg/day)

0.0031









Lead

206

ug/L

8.5E-09

(mg/kg/day)

NA

(mg/kg/day)"



6.0E-07

(mg/kg/day)

NA

(mg/kg/day)











Manganese

1020

ug/L

4.2E-07

(mg/kg/day)

NA

(mg/kg/day)"



3.0E-05

(mg/kg/day)

9.6E-04

(mg/kg/day)

0.031









Mercury

0.091

ug/L

3.8E-11

(mg/kg/day)

NA

(mg/kg/day)"



2.6E-09

(mg/kg/day)

1.4E-04

(mg/kg/day)

0.000019









Nickel

15.8

ug/L

1.3E-09

(mg/kg/day)

NA

(mg/kg/day)"



9.2E-08

(mg/kg/day)

8.0E-04

(mg/kg/day)

0.00011









Selenium

1.6

ug/L

6.6E-10

(mg/kg/day)

NA

(mg/kg/day)"



4.6E-08

(mg/kg/day)

5.0E-03

(mg/kg/day)

0.0000093









Thallium

2.3

ug/L

9.5E-10

(mg/kg/day)

NA

(mg/kg/day)"



6.7E-08

(mg/kg/day)

4.0E-05

(mg/kg/day)

0.0017









Vanadium

30.5

ug/L

1.3E-08

(mg/kg/day)

NA

(mg/kg/day)"



8.8E-07

(mg/kg/day)

2.6E-04

(mg/kg/day)

0.0034









Zinc

343

ug/L

8.5E-08

(mg/kg/day)

NA

(mg/kg/day)"



6.0E-06

(mg/kg/day)

3.0E-01

(mg/kg/day)

0.000020







Exp. Route Total





4.4E-08



0.09





Exposure Point Total



1.1E-07



0.12



Exposure Medium Total



1.1E-07



0.12


-------
TABLE 7.5.RME

CALCULATION OF CHEMICAL CANCER RISKS AND NON-CANCER HAZARDS
REASONABLE MAXIMUM EXPOSURES
OLD WILMINGTON ROAD SITE
PAGE 3 OF 3

Scenario Timeframe: Future

Receptor Population: Construction Workers

Receptor Age: Adult	

Medium

Exposure Medium

Exposure Point

Exposure Route

Chemical of
Potential Concern

EPC

Cancer Risk Calculations

Non-Cancer Hazard Calculations

Value

Units

Intake/Exposure Concentration

CSF/Unit Risk

Cancer Risk

Intake/Exposure Concentration

RfD/RfC

Hazard Quotient

Value

Units

Value

Units



Value

Units

Value

Units

Groundwater

Air

OWR

Inhalation

2-Butanone

9.4E-03

mg/m3

3.7E-06

(mg/m3)

NA

(ug/m3)"1



2.6E-04

(mg/m3)

1.0E+00

(mg/m3)

0.00026









cis-1,2-Dichloroethene

2.6E-02

mg/m3

1.0E-05

(mg/m3)

NA

(ug/m3)"1



7.1E-04

(mg/m3)

NA

(mg/m3)











Methyl tert-butyl ether

7.7E-03

mg/m3

3.0E-06

(mg/m3)

2.6E-07

(ug/m3)"1

7.8E-10

2.1E-04

(mg/m3)

3.0E+00

(mg/m3)

0.000070









Trichloroethene

2.0E-01

mg/m3

7.7E-05

(mg/m3)

4.1E-06

(ug/m3)"1

3.1E-07

5.4E-03

(mg/m3)

2.0E-03

(mg/m3)

2.7









1,4-Dioxane

2.5E-03

mg/m3

9.8E-07

(mg/m3)

5.0E-06

(ug/m3)"1

4.9E-09

6.8E-05

(mg/m3)

7.2E-01

(mg/m3)

0.000095









Caprolactam

0.0E+00

mg/m3

0.0E+00

(mg/m3)

NA

(ug/m3)"1



0.0E+00

(mg/m3)

2.2E-03

(mg/m3)











Aluminum

0.0E+00

mg/m3

0.0E+00

(mg/m3)

NA

(ug/m3)"1



0.0E+00

(mg/m3)

5.0E-03

(mg/m3)











Antimony

0.0E+00

mg/m3

0.0E+00

(mg/m3)

NA

(ug/m3)"1



0.0E+00

(mg/m3)

NA

(mg/m3)











Arsenic

0.0E+00

mg/m3

0.0E+00

(mg/m3)

4.3E-03

(ug/m3)"1



0.0E+00

(mg/m3)

1.5E-05

(mg/m3)











Barium

0.0E+00

mg/m3

0.0E+00

(mg/m3)

NA

(ug/m3)"1



0.0E+00

(mg/m3)

5.0E-03

(mg/m3)











Beryllium

0.0E+00

mg/m3

0.0E+00

(mg/m3)

2.4E-03

(ug/m3)"1



0.0E+00

(mg/m3)

2.0E-05

(mg/m3)











Cadmium

0.0E+00

mg/m3

0.0E+00

(mg/m3)

1.8E-03

(ug/m3)"1



0.0E+00

(mg/m3)

1.0E-05

(mg/m3)











Cobalt

0.0E+00

mg/m3

0.0E+00

(mg/m3)

9.0E-03

(ug/m3)"1



0.0E+00

(mg/m3)

2.0E-05

(mg/m3)











Copper

0.0E+00

mg/m3

0.0E+00

(mg/m3)

NA

(ug/m3)"1



0.0E+00

(mg/m3)

NA

(mg/m3)











Iron

0.0E+00

mg/m3

0.0E+00

(mg/m3)

NA

(ug/m3)"1



0.0E+00

(mg/m3)

NA

(mg/m3)











Lead

0.0E+00

mg/m3

0.0E+00

(mg/m3)

NA

(ug/m3)"1



0.0E+00

(mg/m3)

NA

(mg/m3)











Manganese

0.0E+00

mg/m3

0.0E+00

(mg/m3)

NA

(ug/m3)"1



0.0E+00

(mg/m3)

5.0E-05

(mg/m3)











Mercury

0.0E+00

mg/m3

0.0E+00

(mg/m3)

NA

(ug/m3)"1



0.0E+00

(mg/m3)

3.0E-04

(mg/m3)











Nickel

0.0E+00

mg/m3

0.0E+00

(mg/m3)

2.6E-04

(ug/m3)"1



0.0E+00

(mg/m3)

2.0E-04

(mg/m3)











Selenium

0.0E+00

mg/m3

0.0E+00

(mg/m3)

NA

(ug/m3)"1



0.0E+00

(mg/m3)

2.0E-02

(mg/m3)











Thallium

0.0E+00

mg/m3

0.0E+00

(mg/m3)

NA

(ug/m3)"1



0.0E+00

(mg/m3)

NA

(mg/m3)











Vanadium

0.0E+00

mg/m3

0.0E+00

(mg/m3)

NA

(ug/m3)"1



0.0E+00

(mg/m3)

1.0E-04

(mg/m3)











Zinc

0.0E+00

mg/m3

0.0E+00

(mg/m3)

NA

(ug/m3)"1



0.0E+00

(mg/m3)

NA

(mg/m3)









Exp. Route Total





3.2E-07



2.7

Exposure Point Total



3.2E-07



2.7

Exposure Medium Total



3.2E-07



2.7

Medium Total



4.3E-07



2.8

Total of Receptor Risks Across All Media

9.9E-07

Total of Receptor Hazards Across All Media

5.1

1 - Mutagenic chemicals were evaluated in accordance with USEPA's Supplemental Guidance for Assessing Susceptibility from Early-Life Exposure to Carcinogens (2005).


-------
TABLE 7.6.RME

CALCULATION OF CHEMICAL CANCER RISKS AND NON-CANCER HAZARDS
REASONABLE MAXIMUM EXPOSURES
OLD WILMINGTON ROAD SITE
PAGE 1 OF 3

Scenario Timeframe: Future

Receptor Population: Industrial Worker

Receptor Age: Adult	

Medium

Exposure Medium

Exposure Point

Exposure Route

Chemical of

EPC

Cancer Risk Calculations

Non-Cancer Hazard Calculations









Potential Concern

Value

Units

Intake/Exposure Concentration

CSF/Unit Risk

Cancer Risk

Intake/Exposure Concentration

RfD/RfC

Hazard Quotient















Value

Units

Value

Units



Value

Units

Value

Units



Surface/Subsurface Soil

Surface/Subsurface Soil

OWR

Ingestion

Benzo(a)pyrene

0.252

mg/kg

7.7E-08

(mg/kg/day)

1.0E+00

(mg/kg/day)"

7.7E-08

2.2E-07

(mg/kg/day)

3.0E-04

(mg/kg/day)

0.00072









Naphthalene

9.8

mg/kg

3.0E-06

(mg/kg/day)

NA

(mg/kg/day)"



8.4E-06

(mg/kg/day)

2.0E-02

(mg/kg/day)

0.00042









Dieldrin

0.11

mg/kg

3.4E-08

(mg/kg/day)

1.6E+01

(mg/kg/day)"

5.4E-07

9.4E-08

(mg/kg/day)

5.0E-05

(mg/kg/day)

0.0019









Aluminum

9940

mg/kg

3.0E-03

(mg/kg/day)

NA

(mg/kg/day)"



8.5E-03

(mg/kg/day)

1.0E+00

(mg/kg/day)

0.009









Antimony

6.48

mg/kg

2.0E-06

(mg/kg/day)

NA

(mg/kg/day)"



5.5E-06

(mg/kg/day)

4.0E-04

(mg/kg/day)

0.014









Arsenic

3.95

mg/kg

7.2E-07

(mg/kg/day)

1.5E+00

(mg/kg/day)"

1.1E-06

2.0E-06

(mg/kg/day)

3.0E-04

(mg/kg/day)

0.0068









Cobalt

6.32

mg/kg

1.9E-06

(mg/kg/day)

NA

(mg/kg/day)"



5.4E-06

(mg/kg/day)

3.0E-04

(mg/kg/day)

0.018









Copper

660

mg/kg

2.0E-04

(mg/kg/day)

NA

(mg/kg/day)"



5.7E-04

(mg/kg/day)

4.0E-02

(mg/kg/day)

0.014









Iron

19200

mg/kg

5.9E-03

(mg/kg/day)

NA

(mg/kg/day)"



1.6E-02

(mg/kg/day)

7.0E-01

(mg/kg/day)

0.023









Lead

71.4

mg/kg

2.2E-05

(mg/kg/day)

NA

(mg/kg/day)"



6.1E-05

(mg/kg/day)

NA

(mg/kg/day)











Manganese

388

mg/kg

1.2E-04

(mg/kg/day)

NA

(mg/kg/day)"



3.3E-04

(mg/kg/day)

2.4E-02

(mg/kg/day)

0.014









Thallium

2.13

mg/kg

6.5E-07

(mg/kg/day)

NA

(mg/kg/day)"



1.8E-06

(mg/kg/day)

1.0E-05

(mg/kg/day)

0.18









Vanadium

23.6

mg/kg

7.2E-06

(mg/kg/day)

NA

(mg/kg/day)"



2.0E-05

(mg/kg/day)

5.0E-03

(mg/kg/day)

0.0040









Zinc

380

mg/kg

1.2E-04

(mg/kg/day)

NA

(mg/kg/day)"



3.3E-04

(mg/kg/day)

3.0E-01

(mg/kg/day)

0.0011







Exp. Route Total





1.7E-06



0.29







Dermal

Benzo(a)pyrene

0.252

mg/kg

4.2E-08

(mg/kg/day)

1.0E+00

(mg/kg/day)"

4.2E-08

1.2E-07

(mg/kg/day)

3.0E-04

(mg/kg/day)

0.00040









Naphthalene

9.8

mg/kg

1.6E-06

(mg/kg/day)

NA

(mg/kg/day)"



4.6E-06

(mg/kg/day)

2.0E-02

(mg/kg/day)

0.00023









Dieldrin

0.11

mg/kg

1.4E-08

(mg/kg/day)

1.6E+01

(mg/kg/day)"

2.3E-07

4.0E-08

(mg/kg/day)

5.0E-05

(mg/kg/day)

0.00080









Aluminum

9940

mg/kg

1.3E-04

(mg/kg/day)

NA

(mg/kg/day)"



3.6E-04

(mg/kg/day)

1.0E+00

(mg/kg/day)

0.00036









Antimony

6.48

mg/kg

8.4E-08

(mg/kg/day)

NA

(mg/kg/day)"



2.3E-07

(mg/kg/day)

6.0E-05

(mg/kg/day)

0.0039









Arsenic

3.95

mg/kg

1.5E-07

(mg/kg/day)

1.5E+00

(mg/kg/day)"

2.3E-07

4.3E-07

(mg/kg/day)

3.0E-04

(mg/kg/day)

0.0014









Cobalt

6.32

mg/kg

8.2E-08

(mg/kg/day)

NA

(mg/kg/day)"



2.3E-07

(mg/kg/day)

3.0E-04

(mg/kg/day)

0.00076









Copper

660

mg/kg

8.5E-06

(mg/kg/day)

NA

(mg/kg/day)"



2.4E-05

(mg/kg/day)

4.0E-02

(mg/kg/day)

0.0006









Iron

19200

mg/kg

2.5E-04

(mg/kg/day)

NA

(mg/kg/day)"



7.0E-04

(mg/kg/day)

7.0E-01

(mg/kg/day)

0.0010









Lead

71.4

mg/kg

0.0E+00

(mg/kg/day)

NA

(mg/kg/day)"



0.0E+00

(mg/kg/day)

NA

(mg/kg/day)











Manganese

388

mg/kg

5.0E-06

(mg/kg/day)

NA

(mg/kg/day)"



1.4E-05

(mg/kg/day)

9.6E-04

(mg/kg/day)

0.015









Thallium

2.13

mg/kg

2.8E-08

(mg/kg/day)

NA

(mg/kg/day)"



7.7E-08

(mg/kg/day)

1.0E-05

(mg/kg/day)

0.0077









Vanadium

23.6

mg/kg

3.1E-07

(mg/kg/day)

NA

(mg/kg/day)"



8.6E-07

(mg/kg/day)

1.3E-04

(mg/kg/day)

0.0066









Zinc

380

mg/kg

4.9E-06

(mg/kg/day)

NA

(mg/kg/day)"



1.4E-05

(mg/kg/day)

3.0E-01

(mg/kg/day)

0.000046







Exp. Route Total





5.0E-07



0.038





Exposure Point Total



2.2E-06



0.33



Exposure Medium Total



2.2E-06



0.33



Air

OWR

Inhalation

Benzo(a)pyrene

7.8E-11

mg/m3

6.3E-12

(mg/m3)

6.0E-04

(ug/m3)"1

3.8E-12

1.8E-11

(mg/m3)

2.0E-06

(mg/m3)

0.000009









Naphthalene

1.7E-04

mg/m3

1.3E-05

(mg/m3)

3.4E-05

(ug/m3)"1

4.6E-07

3.8E-05

(mg/m3)

3.0E-03

(mg/m3)

0.013









Dieldrin

3.4E-11

mg/m3

2.8E-12

(mg/m3)

4.6E-03

(ug/m3)"1

1.3E-11

7.8E-12

(mg/m3)

NA

(mg/m3)











Aluminum

3.1E-06

mg/m3

2.5E-07

(mg/m3)

NA

(ug/m3)"1



7.0E-07

(mg/m3)

5.0E-03

(mg/m3)

0.00014









Antimony

2.0E-09

mg/m3

1.6E-10

(mg/m3)

NA

(ug/m3)"1



4.6E-10

(mg/m3)

NA

(mg/m3)











Arsenic

1.2E-09

mg/m3

9.9E-11

(mg/m3)

4.3E-03

(ug/m3)"1

4.3E-10

2.8E-10

(mg/m3)

1.5E-05

(mg/m3)

0.000019









Cobalt

2.0E-09

mg/m3

1.6E-10

(mg/m3)

9.0E-03

(ug/m3)"1

1.4E-09

4.5E-10

(mg/m3)

6.0E-06

(mg/m3)

0.000074









Copper

2.0E-07

mg/m3

1.7E-08

(mg/m3)

NA

(ug/m3)"1



4.7E-08

(mg/m3)

NA

(mg/m3)











Iron

5.9E-06

mg/m3

4.8E-07

(mg/m3)

NA

(ug/m3)"1



1.4E-06

(mg/m3)

NA

(mg/m3)











Lead

2.2E-08

mg/m3

1.8E-09

(mg/m3)

NA

(ug/m3)"1



5.0E-09

(mg/m3)

NA

(mg/m3)











Manganese

1.2E-07

mg/m3

9.8E-09

(mg/m3)

NA

(ug/m3)"1



2.7E-08

(mg/m3)

5.0E-05

(mg/m3)

0.00055









Thallium

6.6E-10

mg/m3

5.4E-11

(mg/m3)

NA

(ug/m3)"1



1.5E-10

(mg/m3)

NA

(mg/m3)











Vanadium

7.3E-09

mg/m

5.9E-10

(mg/m3)

NA

(ug/m3)"1



1.7E-09

(mg/m3)

1.0E-04

(mg/m3)

0.000017









Zinc

1.2E-07

mg/m3

9.6E-09

(mg/m3)

NA

(ug/m3)"1



2.7E-08

(mg/m3)

NA

(mg/m3)









Exp. Route Total





4.6E-07



0.013





Exposure Point Total



4.6E-07



0.013



Exposure Medium Total



4.6E-07



0.013

Medium Total



2.7E-06



0.34


-------
TABLE 7.6.RME

CALCULATION OF CHEMICAL CANCER RISKS AND NON-CANCER HAZARDS
REASONABLE MAXIMUM EXPOSURES
OLD WILMINGTON ROAD SITE
PAGE 2 OF 3

Scenario Timeframe: Future

Receptor Population: Industrial Worker

Receptor Age: Adult	

Exposure Medium

Exposure Route

Chemical of

EPC

Cancer Risk Calculations

Non-Cancer Hazard Calculations



Potential Concern

Value

Units

Intake/Exposure Concentration

CSF/Unit Risk

Cancer Risk

Intake/Exposure Concentration

RfD/RfC

Hazard Quotient









Value

Units

Value

Units



Value

Units

Value

Units



Ingestion

2-Butanone

1300

ug/L

5.0E-03

(mg/kg/day)

NA

(mg/kg/day)"



1.4E-02

(mg/kg/day)

6.0E-01

(mg/kg/day)

0.023



2-Hexanone

41

ug/L

1.6E-04

(mg/kg/day)

NA

(mg/kg/day)"



4.4E-04

(mg/kg/day)

5.0E-03

(mg/kg/day)

0.088



Chloroform

9.4

ug/L

3.6E-05

(mg/kg/day)

3.1E-02

(mg/kg/day)"

1.1E-06

1.0E-04

(mg/kg/day)

1.0E-02

(mg/kg/day)

0.010



cis-1,2-Dichloroethene

1.88

ug/L

7.2E-06

(mg/kg/day)

NA

(mg/kg/day)"



2.0E-05

(mg/kg/day)

2.0E-03

(mg/kg/day)

0.010



Methyl Tert-Butyl Ether

15

ug/L

5.7E-05

(mg/kg/day)

1.8E-03

(mg/kg/day)"

1.0E-07

1.6E-04

(mg/kg/day)

NA

(mg/kg/day)





Tetrachloroethene

65.7

ug/L

2.5E-04

(mg/kg/day)

2.1E-03

(mg/kg/day)"

5.3E-07

7.0E-04

(mg/kg/day)

6.0E-03

(mg/kg/day)

0.12



Trichloroethene

10.6

ug/L

4.1E-05

(mg/kg/day)

4.6E-02

(mg/kg/day)"

1.9E-06

1.1E-04

(mg/kg/day)

5.0E-04

(mg/kg/day)

0.23



Vinyl Chloride

0.57

ug/L

2.2E-06

(mg/kg/day)

7.2E-01

(mg/kg/day)"

1.6E-06

6.1E-06

(mg/kg/day)

3.0E-03

(mg/kg/day)

0.0020



1,4-Dioxane

3.84

ug/L

1.5E-05

(mg/kg/day)

1.0E-01

(mg/kg/day)"

1.5E-06

4.1E-05

(mg/kg/day)

3.0E-02

(mg/kg/day)

0.0014



Bis(2-ethylhexyl)phthalate

11

ug/L

4.2E-05

(mg/kg/day)

1.4E-02

(mg/kg/day)"

5.9E-07

1.2E-04

(mg/kg/day)

2.0E-02

(mg/kg/day)

0.0059



Caprolactam

2800

ug/L

1.1E-02

(mg/kg/day)

NA

(mg/kg/day)"



3.0E-02

(mg/kg/day)

5.0E-01

(mg/kg/day)

0.060



Aluminum

57655

ug/L

2.2E-01

(mg/kg/day)

NA

(mg/kg/day)"



6.2E-01

(mg/kg/day)

1.0E+00

(mg/kg/day)

0.62



Antimony

1.31

ug/L

5.0E-06

(mg/kg/day)

NA

(mg/kg/day)"



1.4E-05

(mg/kg/day)

4.0E-04

(mg/kg/day)

0.035



Arsenic

12.8

ug/L

4.9E-05

(mg/kg/day)

1.5E+00

(mg/kg/day)"

7.3E-05

1.4E-04

(mg/kg/day)

3.0E-04

(mg/kg/day)

0.46



Barium

674

ug/L

2.6E-03

(mg/kg/day)

NA

(mg/kg/day)"



7.2E-03

(mg/kg/day)

2.0E-01

(mg/kg/day)

0.036



Beryllium

3.46

ug/L

1.3E-05

(mg/kg/day)

NA

(mg/kg/day)"



3.7E-05

(mg/kg/day)

2.0E-03

(mg/kg/day)

0.019



Cadmium

0.424

ug/L

1.6E-06

(mg/kg/day)

NA

(mg/kg/day)"



4.5E-06

(mg/kg/day)

5.0E-04

(mg/kg/day)

0.0091



Cobalt

63.9

ug/L

2.4E-04

(mg/kg/day)

NA

(mg/kg/day)"



6.8E-04

(mg/kg/day)

3.0E-04

(mg/kg/day)

2.28



Copper

75.2

ug/L

2.9E-04

(mg/kg/day)

NA

(mg/kg/day)"



8.0E-04

(mg/kg/day)

4.0E-02

(mg/kg/day)

0.020



Iron

45400

ug/L

1.7E-01

(mg/kg/day)

NA

(mg/kg/day)"



4.9E-01

(mg/kg/day)

7.0E-01

(mg/kg/day)

0.69



Lead

23.1

ug/L

8.8E-05

(mg/kg/day)

NA

(mg/kg/day)"



2.5E-04

(mg/kg/day)

NA

(mg/kg/day)





Manganese

2525

ug/L

9.7E-03

(mg/kg/day)

NA

(mg/kg/day)"



2.7E-02

(mg/kg/day)

2.4E-02

(mg/kg/day)

1.13



Mercury

0.128

ug/L

4.9E-07

(mg/kg/day)

NA

(mg/kg/day)"



1.4E-06

(mg/kg/day)

3.0E-04

(mg/kg/day)

0.0046



Nickel

51.7

ug/L

2.0E-04

(mg/kg/day)

NA

(mg/kg/day)"



5.5E-04

(mg/kg/day)

2.0E-02

(mg/kg/day)

0.028



Selenium

3.1

ug/L

1.2E-05

(mg/kg/day)

NA

(mg/kg/day)"



3.3E-05

(mg/kg/day)

5.0E-03

(mg/kg/day)

0.0066



Thallium

0.539

ug/L

2.1E-06

(mg/kg/day)

NA

(mg/kg/day)"



5.8E-06

(mg/kg/day)

1.0E-05

(mg/kg/day)

0.58



Vanadium

12.3

ug/L

4.7E-05

(mg/kg/day)

NA

(mg/kg/day)"



1.3E-04

(mg/kg/day)

5.0E-03

(mg/kg/day)

0.026



Zinc

378

ug/L

1.4E-03

(mg/kg/day)

NA

(mg/kg/day)"



4.0E-03

(mg/kg/day)

3.0E-01

(mg/kg/day)

0.013

Exp. Route Total





8.1E-05



6.5

Dermal

2-Butanone

1300

ug/L

8.4E-06

(mg/kg/day)

NA

(mg/kg/day)"



2.4E-05

(mg/kg/day)

6.0E-01

(mg/kg/day)

0.000039



2-Hexanone

41

ug/L

1.1E-06

(mg/kg/day)

NA

(mg/kg/day)"



3.2E-06

(mg/kg/day)

5.0E-03

(mg/kg/day)

0.00064



Chloroform

9.4

ug/L

4.0E-07

(mg/kg/day)

3.1E-02

(mg/kg/day)"

1.2E-08

1.1E-06

(mg/kg/day)

1.0E-02

(mg/kg/day)

0.00011



cis-1,2-Dichloroethene

1.88

ug/L

1.1E-07

(mg/kg/day)

NA

(mg/kg/day)"



3.0E-07

(mg/kg/day)

2.0E-03

(mg/kg/day)

0.00015



Methyl Tert-Butyl Ether

15

ug/L

1.7E-07

(mg/kg/day)

1.8E-03

(mg/kg/day)"

3.1E-10

4.8E-07

(mg/kg/day)

NA

(mg/kg/day)





Tetrachloroethene

65.7

ug/L

2.0E-05

(mg/kg/day)

2.1E-03

(mg/kg/day)"

4.1E-08

5.5E-05

(mg/kg/day)

6.0E-03

(mg/kg/day)

0.009



Trichloroethene

10.6

ug/L

8.3E-07

(mg/kg/day)

4.6E-02

(mg/kg/day)"

3.8E-08

2.3E-06

(mg/kg/day)

5.0E-04

(mg/kg/day)

0.0047



Vinyl Chloride

0.57

ug/L

1.6E-08

(mg/kg/day)

7.2E-01

(mg/kg/day)"

1.2E-08

4.6E-08

(mg/kg/day)

3.0E-03

(mg/kg/day)

0.000015



1,4-Dioxane

3.84

ug/L

1.1E-08

(mg/kg/day)

1.0E-01

(mg/kg/day)"

1.1E-09

3.0E-08

(mg/kg/day)

3.0E-02

(mg/kg/day)

0.0000010



Bis(2-ethylhexyl)phthalate

11

ug/L

0.0E+00

(mg/kg/day)

1.4E-02

(mg/kg/day)"



0.0E+00

(mg/kg/day)

2.0E-02

(mg/kg/day)





Caprolactam

2800

ug/L

2.8E-05

(mg/kg/day)

NA

(mg/kg/day)"



7.9E-05

(mg/kg/day)

5.0E-01

(mg/kg/day)

0.00016



Aluminum

57655

ug/L

1.6E-04

(mg/kg/day)

NA

(mg/kg/day)"



4.4E-04

(mg/kg/day)

1.0E+00

(mg/kg/day)

0.00044



Antimony

1.31

ug/L

3.5E-09

(mg/kg/day)

NA

(mg/kg/day)"



9.9E-09

(mg/kg/day)

6.0E-05

(mg/kg/day)

0.00016



Arsenic

12.8

ug/L

3.5E-08

(mg/kg/day)

1.5E+00

(mg/kg/day)"

5.2E-08

9.7E-08

(mg/kg/day)

3.0E-04

(mg/kg/day)

0.00032



Barium

674

ug/L

1.8E-06

(mg/kg/day)

NA

(mg/kg/day)"



5.1E-06

(mg/kg/day)

1.4E-02

(mg/kg/day)

0.00036



Beryllium

3.46

ug/L

9.3E-09

(mg/kg/day)

NA

(mg/kg/day)"



2.6E-08

(mg/kg/day)

1.4E-05

(mg/kg/day)

0.0019



Cadmium

0.424

ug/L

1.1E-09

(mg/kg/day)

NA

(mg/kg/day)"



3.2E-09

(mg/kg/day)

2.5E-05

(mg/kg/day)

0.00013



Cobalt

63.9

ug/L

6.9E-08

(mg/kg/day)

NA

(mg/kg/day)"



1.9E-07

(mg/kg/day)

3.0E-04

(mg/kg/day)

0.00064



Copper

75.2

ug/L

2.0E-07

(mg/kg/day)

NA

(mg/kg/day)"



5.7E-07

(mg/kg/day)

4.0E-02

(mg/kg/day)

0.000014



Iron

45400

ug/L

1.2E-04

(mg/kg/day)

NA

(mg/kg/day)"



3.4E-04

(mg/kg/day)

7.0E-01

(mg/kg/day)

0.00049



Lead

23.1

ug/L

6.2E-09

(mg/kg/day)

NA

(mg/kg/day)"



1.7E-08

(mg/kg/day)

NA

(mg/kg/day)





Manganese

2525

ug/L

6.8E-06

(mg/kg/day)

NA

(mg/kg/day)"



1.9E-05

(mg/kg/day)

9.6E-04

(mg/kg/day)

0.020



Mercury

0.128

ug/L

3.5E-10

(mg/kg/day)

NA

(mg/kg/day)"



9.7E-10

(mg/kg/day)

2.1E-05

(mg/kg/day)

0.000046



Nickel

51.7

ug/L

2.8E-08

(mg/kg/day)

NA

(mq/kq/dav)



7.8E-08

(mg/kg/day)

8.0E-04

(mg/kg/day)

0.000098

Groundwater

Groundwater


-------
TABLE 7.6.RME

CALCULATION OF CHEMICAL CANCER RISKS AND NON-CANCER HAZARDS
REASONABLE MAXIMUM EXPOSURES
OLD WILMINGTON ROAD SITE
PAGE 3 OF 3

Scenario Timeframe: Future

Receptor Population: Industrial Worker

Receptor Age: Adult	

Medium

Exposure Medium

Exposure Point

Exposure Route

Chemical of

EPC

Cancer Risk Calculations

Non-Cancer Hazard Calculations









Potential Concern

Value

Units

Intake/Exposure Concentration

CSF/Unit Risk

Cancer Risk

Intake/Exposure Concentration

RfD/RfC

Hazard Quotient















Value

Units

Value

Units



Value

Units

Value

Units



Groundwater

Groundwater

OWRGC

Dermal

Selenium

3.1

ug/L

8.4E-09

(mg/kg/day)

NA

(mg/kg/day)"1



2.3E-08

(mg/kg/day)

5.0E-03

(mg/kg/day)

0.0000047









Thallium

0.539

ug/L

1.5E-09

(mg/kg/day)

NA

(mg/kg/day)"1



4.1E-09

(mg/kg/day)

1.0E-05

(mg/kg/day)

0.00041









Vanadium

12.3

ug/L

3.3E-08

(mg/kg/day)

NA

(mg/kg/day)"1



9.3E-08

(mg/kg/day)

1.3E-04

(mg/kg/day)

0.00071









Zinc

378

ug/L

6.1E-07

(mg/kg/day)

NA

(mg/kg/day)"1



1.7E-06

(mg/kg/day)

3.0E-01

(mg/kg/day)

0.0000057







Exp. Route Total





1.6E-07



0.040





Exposure Point Total



8.1E-05



6.5



Exposure Medium Total



8.1E-05



6.5



Air

OWR

Inhalation

2-Butanone

1.7E-02

mg/m3

4.1E-03

(mg/m3)

NA

(ug/m3)"1



1.2E-02

(mg/m3)

5.0E+00

(mg/m3)

0.0023









2-Hexanone

6.5E-04

mg/m3

1.6E-04

(mg/m3)

NA

(ug/m3)"1



4.4E-04

(mg/m3)

3.0E-02

(mg/m3)

0.015









Chloroform

4.0E-04

mg/m3

9.8E-05

(mg/m3)

2.3E-05

(ug/m3)"1

2.2E-06

2.7E-04

(mg/m3)

9.8E-02

(mg/m3)

0.0028









cis-1,2-Dichloroethene

8.7E-05

mg/m3

2.1E-05

(mg/m3)

NA

(ug/m3)"1



5.9E-05

(mg/m3)

NA

(mg/m3)











Methyl Tert-Butyl Ether

5.7E-04

mg/m3

1.4E-04

(mg/m3)

2.6E-07

(ug/m3)"1

3.6E-08

3.9E-04

(mg/m3)

3.0E+00

(mg/m3)

0.00013









Tetrachloroethene

2.6E-03

mg/m3

6.2E-04

(mg/m3)

2.6E-07

(ug/m3)"1

1.6E-07

1.7E-03

(mg/m3)

4.0E-02

(mg/m3)

0.044









Trichloroethene

4.5E-04

mg/m3

1.1E-04

(mg/m3)

4.1E-06

(ug/m3)"1

4.5E-07

3.1E-04

(mg/m3)

2.0E-03

(mg/m3)

0.15









Vinyl Chloride

3.2E-05

mg/m3

7.8E-06

(mg/m3)

4.4E-06

(ug/m3)"1

3.4E-08

2.2E-05

(mg/m3)

1.0E-01

(mg/m3)

0.00022









1,4-Dioxane

4.8E-06

mg/m3

1.2E-06

(mg/m3)

5.0E-06

(ug/m3)"1

5.9E-09

3.3E-06

(mg/m3)

3.0E-02

(mg/m3)

0.00011









Bis(2-ethylhexyl)phthalate

0.0E+00

mg/m3

0.0E+00

(mg/m3)

2.4E-06

(ug/m3)"1



0.0E+00

(mg/m3)

NA

(mg/m3)











Caprolactam

0.0E+00

mg/m3

0.0E+00

(mg/m3)

NA

(ug/m3)"1



0.0E+00

(mg/m3)

2.2E-03

(mg/m3)











Aluminum

0.0E+00

mg/m3

0.0E+00

(mg/m3)

NA

(ug/m3)"1



0.0E+00

(mg/m3)

5.0E-03

(mg/m3)











Antimony

0.0E+00

mg/m3

0.0E+00

(mg/m3)

NA

(ug/m3)"1



0.0E+00

(mg/m3)

NA

(mg/m3)











Arsenic

0.0E+00

mg/m3

0.0E+00

(mg/m3)

4.3E-03

(ug/m3)"1



0.0E+00

(mg/m3)

1.5E-05

(mg/m3)











Barium

0.0E+00

mg/m3

0.0E+00

(mg/m3)

NA

(ug/m3)"1



0.0E+00

(mg/m3)

5.0E-04

(mg/m3)











Beryllium

0.0E+00

mg/m3

0.0E+00

(mg/m3)

2.4E-03

(ug/m3)"1



0.0E+00

(mg/m3)

2.0E-05

(mg/m3)











Cadmium

0.0E+00

mg/m3

0.0E+00

(mg/m3)

1.8E-03

(ug/m3)"1



0.0E+00

(mg/m3)

1.0E-05

(mg/m3)











Cobalt

0.0E+00

mg/m3

0.0E+00

(mg/m3)

9.0E-03

(ug/m3)"1



0.0E+00

(mg/m3)

6.0E-06

(mg/m3)











Copper

0.0E+00

mg/m3

0.0E+00

(mg/m3)

NA

(ug/m3)"1



0.0E+00

(mg/m3)

NA

(mg/m3)











Iron

0.0E+00

mg/m3

0.0E+00

(mg/m3)

NA

(ug/m3)"1



0.0E+00

(mg/m3)

NA

(mg/m3)











Lead

0.0E+00

mg/m3

0.0E+00

(mg/m3)

NA

(ug/m3)"1



0.0E+00

(mg/m3)

NA

(mg/m3)











Manganese

0.0E+00

mg/m3

0.0E+00

(mg/m3)

NA

(ug/m3)"1



0.0E+00

(mg/m3)

5.0E-05

(mg/m3)











Mercury

0.0E+00

mg/m3

0.0E+00

(mg/m3)

NA

(ug/m3)"1



0.0E+00

(mg/m3)

3.0E-04

(mg/m3)











Nickel

0.0E+00

mg/m3

0.0E+00

(mg/m3)

2.6E-04

(ug/m3)"1



0.0E+00

(mg/m3)

9.0E-05

(mg/m3)











Selenium

0.0E+00

mg/m3

0.0E+00

(mg/m3)

NA

(ug/m3)"1



0.0E+00

(mg/m3)

2.0E-02

(mg/m3)











Thallium

0.0E+00

mg/m3

0.0E+00

(mg/m3)

NA

(ug/m3)"1



0.0E+00

(mg/m3)

NA

(mg/m3)











Vanadium

0.0E+00

mg/m3

0.0E+00

(mg/m3)

NA

(ug/m3)"1



0.0E+00

(mg/m3)

1.0E-04

(mg/m3)











Zinc

0.0E+00

mg/m3

0.0E+00

(mg/m3)

NA

(ug/m3)"1



0.0E+00

(mg/m3)

NA

(mg/m3)









Exp. Route Total





2.9E-06



0.22





Exposure Point Total



2.9E-06



0.22



Exposure Medium Total



2.9E-06



0.22

Medium Total



8.4E-05



6.7

Total of Receptor Risks Across All Media

8.6E-05

Total of Receptor Hazards Across All Media

7.1

Notes:

1 - Mutagenic chemicals were evaluated in accordance with USEPA's Supplemental Guidance for Assessing Susceptibility from Early-Life Exposure to Carcinogens (2005).


-------
TABLE 7.7.RME

CALCULATION OF CHEMICAL CANCER RISKS AND NON-CANCER HAZARDS
REASONABLE MAXIMUM EXPOSURES
OLD WILMINGTON ROAD SITE
PAGE 1 OF 3

Scenario Timeframe: Future
Receptor Population: Residents

Receptor Age: Child	

Medium

Exposure Medium

Exposure Point

Exposure Route

Chemical of

EPC

Cancer Risk Calculations

Non-Cancer Hazard Calculations









Potential Concern

Value

Units

Intake/Exposure Concentration

CSF/Unit Risk

Cancer Risk

Intake/Exposure Concentration

RfD/RfC

Hazard Quotient















Value

Units

Value

Units



Value

Units

Value

Units



Surface/Subsurface Soil

Surface/Subsurface Soil

OWR

Ingestion

Benzo(a)pyrene

0.252

mg/kg

1.5E-06

(mg/kg/day)

1.0E+00

(mg/kg/day)"

1.5E-06

3.2E-06

(mg/kg/day)

3.0E-04

(mg/kg/day)

0.011









Naphthalene

9.8

mg/kg

1.1E-05

(mg/kg/day)

NA

(mg/kg/day)"



1.3E-04

(mg/kg/day)

2.0E-02

(mg/kg/day)

0.0063









Dieldrin

0.11

mg/kg

1.2E-07

(mg/kg/day)

1.6E+01

(mg/kg/day)"

1.9E-06

1.4E-06

(mg/kg/day)

5.0E-05

(mg/kg/day)

0.028









Aluminum

9940

mg/kg

1.1E-02

(mg/kg/day)

NA

(mg/kg/day)"



1.3E-01

(mg/kg/day)

1.0E+00

(mg/kg/day)

0.13









Antimony

6.48

mg/kg

7.1E-06

(mg/kg/day)

NA

(mg/kg/day)"



8.3E-05

(mg/kg/day)

4.0E-04

(mg/kg/day)

0.21









Arsenic

3.95

mg/kg

2.6E-06

(mg/kg/day)

1.5E+00

(mg/kg/day)"

3.9E-06

3.0E-05

(mg/kg/day)

3.0E-04

(mg/kg/day)

0.10









Cobalt

6.32

mg/kg

6.9E-06

(mg/kg/day)

NA

(mg/kg/day)"



8.1E-05

(mg/kg/day)

3.0E-04

(mg/kg/day)

0.27









Copper

660

mg/kg

7.2E-04

(mg/kg/day)

NA

(mg/kg/day)"



8.4E-03

(mg/kg/day)

4.0E-02

(mg/kg/day)

0.21









Iron

19200

mg/kg

2.1E-02

(mg/kg/day)

NA

(mg/kg/day)"



2.5E-01

(mg/kg/day)

7.0E-01

(mg/kg/day)

0.35









Lead

71.4

mg/kg

7.8E-05

(mg/kg/day)

NA

(mg/kg/day)"



9.1E-04

(mg/kg/day)

NA

(mg/kg/day)











Manganese

388

mg/kg

4.3E-04

(mg/kg/day)

NA

(mg/kg/day)"



5.0E-03

(mg/kg/day)

2.4E-02

(mg/kg/day)

0.21









Thallium

2.13

mg/kg

2.3E-06

(mg/kg/day)

NA

(mg/kg/day)"



2.7E-05

(mg/kg/day)

1.0E-05

(mg/kg/day)

2.7









Vanadium

23.6

mg/kg

2.6E-05

(mg/kg/day)

NA

(mg/kg/day)"



3.0E-04

(mg/kg/day)

5.0E-03

(mg/kg/day)

0.060









Zinc

380

mg/kg

4.2E-04

(mg/kg/day)

NA

(mg/kg/day)"



4.9E-03

(mg/kg/day)

3.0E-01

(mg/kg/day)

0.016







Exp. Route Total





7.3E-06



4.3







Dermal

Benzo(a)pyrene

0.252

mg/kg

4.5E-07

(mg/kg/day)

1.0E+00

(mg/kg/day)"

4.5E-07

9.9E-07

(mg/kg/day)

3.0E-04

(mg/kg/day)

0.0033









Naphthalene

9.8

mg/kg

3.3E-06

(mg/kg/day)

NA

(mg/kg/day)"



3.9E-05

(mg/kg/day)

2.0E-02

(mg/kg/day)

0.0019









Dieldrin

0.11

mg/kg

2.9E-08

(mg/kg/day)

1.6E+01

(mg/kg/day)"

4.6E-07

3.3E-07

(mg/kg/day)

5.0E-05

(mg/kg/day)

0.0067









Aluminum

9940

mg/kg

2.6E-04

(mg/kg/day)

NA

(mg/kg/day)"



3.0E-03

(mg/kg/day)

1.0E+00

(mg/kg/day)

0.0030









Antimony

6.48

mg/kg

1.7E-07

(mg/kg/day)

NA

(mg/kg/day)"



2.0E-06

(mg/kg/day)

6.0E-05

(mg/kg/day)

0.033









Arsenic

3.95

mg/kg

3.1E-07

(mg/kg/day)

1.5E+00

(mg/kg/day)"

4.6E-07

3.6E-06

(mg/kg/day)

3.0E-04

(mg/kg/day)

0.012









Cobalt

6.32

mg/kg

1.6E-07

(mg/kg/day)

NA

(mg/kg/day)"



1.9E-06

(mg/kg/day)

3.0E-04

(mg/kg/day)

0.0064









Copper

660

mg/kg

1.7E-05

(mg/kg/day)

NA

(mg/kg/day)"



2.0E-04

(mg/kg/day)

4.0E-02

(mg/kg/day)

0.0050









Iron

19200

mg/kg

5.0E-04

(mg/kg/day)

NA

(mg/kg/day)"



5.8E-03

(mg/kg/day)

7.0E-01

(mg/kg/day)

0.0083









Lead

71.4

mg/kg

0.0E+00

(mg/kg/day)

NA

(mg/kg/day)"



0.0E+00

(mg/kg/day)

NA

(mg/kg/day)











Manganese

388

mg/kg

1.0E-05

(mg/kg/day)

NA

(mg/kg/day)"



1.2E-04

(mg/kg/day)

9.6E-04

(mg/kg/day)

0.12









Thallium

2.13

mg/kg

5.5E-08

(mg/kg/day)

NA

(mg/kg/day)"



6.5E-07

(mg/kg/day)

1.0E-05

(mg/kg/day)

0.065









Vanadium

23.6

mg/kg

6.1E-07

(mg/kg/day)

NA

(mg/kg/day)"



7.2E-06

(mg/kg/day)

1.3E-04

(mg/kg/day)

0.055









Zinc

380

mg/kg

9.9E-06

(mg/kg/day)

NA

(mg/kg/day)"



1.2E-04

(mg/kg/day)

3.0E-01

(mg/kg/day)

0.00038







Exp. Route Total





1.4E-06



0.32





Exposure Point Total



8.7E-06



4.6



Exposure Medium Total



8.7E-06



4.6



Air

OWR

Inhalation

Benzo(a)pyrene

7.8E-11

mg/m3

3.4E-11

(mg/m3)

6.0E-04

(ug/m3)"1

2.0E-11

7.5E-11

(mg/m3)

2.0E-06

(mg/m3)

0.000037









Naphthalene

1.7E-04

mg/m3

1.4E-05

(mg/m3)

3.4E-05

(ug/m3)"1

4.6E-07

1.6E-04

(mg/m3)

3.0E-03

(mg/m3)

0.053









Dieldrin

3.4E-11

mg/m3

2.8E-12

(mg/m3)

4.6E-03

(ug/m3)"1

1.3E-11

3.3E-11

(mg/m3)

NA

(mg/m3)











Aluminum

3.1E-06

mg/m3

2.5E-07

(mg/m3)

NA

(ug/m3)"1



2.9E-06

(mg/m3)

5.0E-03

(mg/m3)

0.00059









Antimony

2.0E-09

mg/m3

1.6E-10

(mg/m3)

NA

(ug/m3)"1



1.9E-09

(mg/m3)

NA

(mg/m3)











Arsenic

1.2E-09

mg/m3

1.0E-10

(mg/m3)

4.3E-03

(ug/m3)"1

4.3E-10

1.2E-09

(mg/m3)

1.5E-05

(mg/m3)

0.000078









Cobalt

2.0E-09

mg/m3

1.6E-10

(mg/m3)

9.0E-03

(ug/m3)"1

1.4E-09

1.9E-09

(mg/m3)

6.0E-06

(mg/m3)

0.00031









Copper

2.0E-07

mg/m3

1.7E-08

(mg/m3)

NA

(ug/m3)"1



2.0E-07

(mg/m3)

NA

(mg/m3)











Iron

5.9E-06

mg/m3

4.9E-07

(mg/m3)

NA

(ug/m3)"1



5.7E-06

(mg/m3)

NA

(mg/m3)











Lead

2.2E-08

mg/m3

1.8E-09

(mg/m3)

NA

(ug/m3)"1



2.1E-08

(mg/m3)

NA

(mg/m3)











Manganese

1.2E-07

mg/m3

9.8E-09

(mg/m3)

NA

(ug/m3)"1



1.1E-07

(mg/m3)

5.0E-05

(mg/m3)

0.0023









Thallium

6.6E-10

mg/m3

5.4E-11

(mg/m3)

NA

(ug/m3)"1



6.3E-10

(mg/m3)

NA

(mg/m3)











Vanadium

7.3E-09

mg/m3

6.0E-10

(mg/m3)

NA

(ug/m3)"1



7.0E-09

(mg/m3)

1.0E-04

(mg/m3)

0.000070









Zinc

1.2E-07

mg/m3

9.6E-09

(mg/m3)

NA

(ug/m3)"1



1.1E-07

(mg/m3)

NA

(mg/m3)









Exp. Route Total





4.6E-07



0.056





Exposure Point Total



4.6E-07



0.056



Exposure Medium Total



4.6E-07



0.056

Medium Total



9.1E-06



4.7


-------
TABLE 7.7.RME

CALCULATION OF CHEMICAL CANCER RISKS AND NON-CANCER HAZARDS
REASONABLE MAXIMUM EXPOSURES
OLD WILMINGTON ROAD SITE
PAGE 2 OF 3

Scenario Timeframe: Future
Receptor Population: Residents

Receptor Age: Child	

Exposure Medium

Exposure Route

Chemical of

EPC

Cancer Risk Calculations

Non-Cancer Hazard Calculations



Potential Concern

Value

Units

Intake/Exposure Concentration

CSF/Unit Risk

Cancer Risk

Intake/Exposure Concentration

RfD/RfC

Hazard Quotient









Value

Units

Value

Units



Value

Units

Value

Units



Ingestion

2-Butanone

1300

ug/L

5.6E-03

(mg/kg/day)

NA

(mg/kg/day)"



6.5E-02

(mg/kg/day)

6.0E-01

(mg/kg/day)

0.11



2-Hexanone

41

ug/L

1.8E-04

(mg/kg/day)

NA

(mg/kg/day)"



2.0E-03

(mg/kg/day)

5.0E-03

(mg/kg/day)

0.41



Chloroform

9.4

ug/L

4.0E-05

(mg/kg/day)

3.1E-02

(mg/kg/day)"

1.2E-06

4.7E-04

(mg/kg/day)

1.0E-02

(mg/kg/day)

0.047



cis-1,2-Dichloroethene

1.88

ug/L

8.0E-06

(mg/kg/day)

NA

(mg/kg/day)"



9.4E-05

(mg/kg/day)

2.0E-03

(mg/kg/day)

0.047



Methyl Tert-Butyl Ether

15

ug/L

6.4E-05

(mg/kg/day)

1.8E-03

(mg/kg/day)"

1.2E-07

7.5E-04

(mg/kg/day)

NA

(mg/kg/day)





Tetrachloroethene

65.7

ug/L

2.8E-04

(mg/kg/day)

2.1E-03

(mg/kg/day)"

5.9E-07

3.3E-03

(mg/kg/day)

6.0E-03

(mg/kg/day)

0.55



Trichloroethene (Mutagenic)

10.6

ug/L

2.4E-04

(mg/kg/day)

9.3E-03

(mg/kg/day)"

2.2E-06

5.3E-04

(mg/kg/day)

NA

(mg/kg/day)





Trichloroethene (Nonmutagenic

10.6

ug/L

4.5E-05

(mg/kg/day)

3.7E-02

(mg/kg/day)"

1.7E-06

5.3E-04

(mg/kg/day)

5.0E-04

(mg/kg/day)

1.06



Vinyl Chloride

0.57

ug/L

3.2E-05

(mg/kg/day)

7.2E-01

(mg/kg/day)"

2.3E-05

2.8E-05

(mg/kg/day)

3.0E-03

(mg/kg/day)

0.0095



1,4-Dioxane

3.84

ug/L

1.6E-05

(mg/kg/day)

1.0E-01

(mg/kg/day)"

1.6E-06

1.9E-04

(mg/kg/day)

3.0E-02

(mg/kg/day)

0.0064



Bis(2-ethylhexyl)phthalate

11

ug/L

4.7E-05

(mg/kg/day)

1.4E-02

(mg/kg/day)"

6.6E-07

5.5E-04

(mg/kg/day)

2.0E-02

(mg/kg/day)

0.027



Caprolactam

2800

ug/L

1.2E-02

(mg/kg/day)

NA

(mg/kg/day)"



1.4E-01

(mg/kg/day)

5.0E-01

(mg/kg/day)

0.28



Aluminum

57655

ug/L

2.5E-01

(mg/kg/day)

NA

(mg/kg/day)"



2.9E+00

(mg/kg/day)

1.0E+00

(mg/kg/day)

2.9



Antimony

1.31

ug/L

5.6E-06

(mg/kg/day)

NA

(mg/kg/day)"



6.5E-05

(mg/kg/day)

4.0E-04

(mg/kg/day)

0.16



Arsenic

12.8

ug/L

5.5E-05

(mg/kg/day)

1.5E+00

(mg/kg/day)"

8.2E-05

6.4E-04

(mg/kg/day)

3.0E-04

(mg/kg/day)

2.1



Barium

674

ug/L

2.9E-03

(mg/kg/day)

NA

(mg/kg/day)"



3.4E-02

(mg/kg/day)

2.0E-01

(mg/kg/day)

0.17



Beryllium

3.46

ug/L

1.5E-05

(mg/kg/day)

NA

(mg/kg/day)"



1.7E-04

(mg/kg/day)

2.0E-03

(mg/kg/day)

0.086



Cadmium

0.424

ug/L

1.8E-06

(mg/kg/day)

NA

(mg/kg/day)"



2.1E-05

(mg/kg/day)

5.0E-04

(mg/kg/day)

0.042



Cobalt

63.9

ug/L

2.7E-04

(mg/kg/day)

NA

(mg/kg/day)"



3.2E-03

(mg/kg/day)

3.0E-04

(mg/kg/day)

10.6



Copper

75.2

ug/L

3.2E-04

(mg/kg/day)

NA

(mg/kg/day)"



3.7E-03

(mg/kg/day)

4.0E-02

(mg/kg/day)

0.094



Iron

45400

ug/L

1.9E-01

(mg/kg/day)

NA

(mg/kg/day)"



2.3E+00

(mg/kg/day)

7.0E-01

(mg/kg/day)

3.2



Lead

23.1

ug/L

9.9E-05

(mg/kg/day)

NA

(mg/kg/day)"



1.2E-03

(mg/kg/day)

NA

(mg/kg/day)





Manganese

2525

ug/L

1.1E-02

(mg/kg/day)

NA

(mg/kg/day)"



1.3E-01

(mg/kg/day)

2.4E-02

(mg/kg/day)

5.2



Mercury

0.128

ug/L

5.5E-07

(mg/kg/day)

NA

(mg/kg/day)"



6.4E-06

(mg/kg/day)

3.0E-04

(mg/kg/day)

0.021



Nickel

51.7

ug/L

2.2E-04

(mg/kg/day)

NA

(mg/kg/day)"



2.6E-03

(mg/kg/day)

2.0E-02

(mg/kg/day)

0.13



Selenium

3.1

ug/L

1.3E-05

(mg/kg/day)

NA

(mg/kg/day)"



1.5E-04

(mg/kg/day)

5.0E-03

(mg/kg/day)

0.031



Thallium

0.539

ug/L

2.3E-06

(mg/kg/day)

NA

(mg/kg/day)"



2.7E-05

(mg/kg/day)

1.0E-05

(mg/kg/day)

2.7



Vanadium

12.3

ug/L

5.3E-05

(mg/kg/day)

NA

(mg/kg/day)"



6.1E-04

(mg/kg/day)

5.0E-03

(mg/kg/day)

0.12



Zinc

378

ug/L

1.6E-03

(mg/kg/day)

NA

(mg/kg/day)"



1.9E-02

(mg/kg/day)

3.0E-01

(mg/kg/day)

0.063

Exp. Route Total





1.1E-04



30

Dermal

2-Butanone

1300

ug/L

4.6E-05

(mg/kg/day)

NA

(mg/kg/day)"



5.3E-04

(mg/kg/day)

6.0E-01

(mg/kg/day)

0.00089



2-Hexanone

41

ug/L

6.4E-06

(mg/kg/day)

NA

(mg/kg/day)"



7.4E-05

(mg/kg/day)

5.0E-03

(mg/kg/day)

0.015



Chloroform

9.4

ug/L

3.2E-06

(mg/kg/day)

3.1E-02

(mg/kg/day)"

9.9E-08

3.7E-05

(mg/kg/day)

1.0E-02

(mg/kg/day)

0.0037



cis-1,2-Dichloroethene

1.88

ug/L

8.9E-07

(mg/kg/day)

NA

(mg/kg/day)"



1.0E-05

(mg/kg/day)

2.0E-03

(mg/kg/day)

0.0052



Methyl Tert-Butyl Ether

15

ug/L

1.3E-06

(mg/kg/day)

1.8E-03

(mg/kg/day)"

2.3E-09

1.5E-05

(mg/kg/day)

NA

(mg/kg/day)





Tetrachloroethene

65.7

ug/L

1.5E-04

(mg/kg/day)

2.1E-03

(mg/kg/day)"

3.1E-07

1.7E-03

(mg/kg/day)

6.0E-03

(mg/kg/day)

0.29



Trichloroethene (Mutagenic)

10.6

ug/L

3.5E-05

(mg/kg/day)

9.3E-03

(mg/kg/day)"

3.3E-07

7.7E-05

(mg/kg/day)

NA

(mg/kg/day)





Trichloroethene (Nonmutagenic

10.6

ug/L

6.6E-06

(mg/kg/day)

3.7E-02

(mg/kg/day)"

2.4E-07

7.7E-05

(mg/kg/day)

5.0E-04

(mg/kg/day)

0.15



Vinyl Chloride

0.57

ug/L

2.2E-06

(mg/kg/day)

7.2E-01

(mg/kg/day)"

1.6E-06

1.9E-06

(mg/kg/day)

3.0E-03

(mg/kg/day)

0.00064



1,4-Dioxane

3.84

ug/L

5.2E-08

(mg/kg/day)

1.0E-01

(mg/kg/day)"

5.2E-09

6.0E-07

(mg/kg/day)

3.0E-02

(mg/kg/day)

0.000020



Bis(2-ethylhexyl)phthalate

11

ug/L

0.0E+00

(mg/kg/day)

1.4E-02

(mg/kg/day)"



0.0E+00

(mg/kg/day)

2.0E-02

(mg/kg/day)





Caprolactam

2800

ug/L

1.3E-04

(mg/kg/day)

NA

(mg/kg/day)"



1.6E-03

(mg/kg/day)

5.0E-01

(mg/kg/day)

0.0031



Aluminum

57655

ug/L

1.1E-03

(mg/kg/day)

NA

(mg/kg/day)"



1.3E-02

(mg/kg/day)

1.0E+00

(mg/kg/day)

0.013



Antimony

1.31

ug/L

2.5E-08

(mg/kg/day)

NA

(mg/kg/day)"



2.9E-07

(mg/kg/day)

6.0E-05

(mg/kg/day)

0.0048



Arsenic

12.8

ug/L

2.4E-07

(mg/kg/day)

1.5E+00

(mg/kg/day)"

3.6E-07

2.8E-06

(mg/kg/day)

3.0E-04

(mg/kg/day)

0.0094



Barium

674

ug/L

1.3E-05

(mg/kg/day)

NA

(mg/kg/day)"



1.5E-04

(mg/kg/day)

1.4E-02

(mg/kg/day)

0.011



Beryllium

3.46

ug/L

6.5E-08

(mg/kg/day)

NA

(mg/kg/day)"



7.6E-07

(mg/kg/day)

1.4E-05

(mg/kg/day)

0.054



Cadmium

0.424

ug/L

8.0E-09

(mg/kg/day)

NA

(mg/kg/day)"



9.3E-08

(mg/kg/day)

2.5E-05

(mg/kg/day)

0.0037



Cobalt

63.9

ug/L

4.8E-07

(mg/kg/day)

NA

(mg/kg/day)"



5.6E-06

(mg/kg/day)

3.0E-04

(mg/kg/day)

0.019



Copper

75.2

ug/L

1.4E-06

(mg/kg/day)

NA

(mg/kg/day)"



1.7E-05

(mg/kg/day)

4.0E-02

(mg/kg/day)

0.00041



Iron

45400

ug/L

8.6E-04

(mg/kg/day)

NA

(mg/kg/day)"



1.0E-02

(mg/kg/day)

7.0E-01

(mg/kg/day)

0.014



Lead

23.1

ug/L

4.4E-08

(mg/kg/day)

NA

(mg/kg/day)"



5.1E-07

(mg/kg/day)

NA

(mg/kg/day)





Manganese

2525

ug/L

4.8E-05

(mg/kg/day)

NA

(mq/kq/dav)



5.5E-04

(mg/kg/day)

9.6E-04

(mg/kg/day)

0.58

Groundwater

Groundwater


-------
TABLE 7.7.RME

CALCULATION OF CHEMICAL CANCER RISKS AND NON-CANCER HAZARDS
REASONABLE MAXIMUM EXPOSURES
OLD WILMINGTON ROAD SITE
PAGE 3 OF 3

Scenario Timeframe: Future
Receptor Population: Residents

Receptor Age: Child	

Medium

Exposure Medium

Exposure Point

Exposure Route

Chemical of

EPC

Cancer Risk Calculations

Non-Cancer Hazard Calculations









Potential Concern

Value

Units

Intake/Exposure Concentration

CSF/Unit Risk

Cancer Risk

Intake/Exposure Concentration

RfD/RfC

Hazard Quotient















Value

Units

Value

Units



Value

Units

Value

Units



Groundwater

Groundwater

OWRGC

Dermal

Mercury

0.128

ug/L

2.4E-09

(mg/kg/day)

NA

(mg/kg/day)"



2.8E-08

(mg/kg/day)

2.1E-05

(mg/kg/day)

0.0013









Nickel

51.7

ug/L

1.9E-07

(mg/kg/day)

NA

(mg/kg/day)"



2.3E-06

(mg/kg/day)

8.0E-04

(mg/kg/day)

0.0028









Selenium

3.1

ug/L

5.8E-08

(mg/kg/day)

NA

(mg/kg/day)"



6.8E-07

(mg/kg/day)

5.0E-03

(mg/kg/day)

0.00014









Thallium

0.539

ug/L

1.0E-08

(mg/kg/day)

NA

(mg/kg/day)"



1.2E-07

(mg/kg/day)

1.0E-05

(mg/kg/day)

0.012









Vanadium

12.3

ug/L

2.3E-07

(mg/kg/day)

NA

(mg/kg/day)"



2.7E-06

(mg/kg/day)

1.3E-04

(mg/kg/day)

0.021









Zinc

378

ug/L

4.3E-06

(mg/kg/day)

NA

(mg/kg/day)"



5.0E-05

(mg/kg/day)

3.0E-01

(mg/kg/day)

0.00017







Exp. Route Total





2.9E-06



1.21





Exposure Point Total



1.2E-04



31



Exposure Medium Total



1.2E-04



31

Medium Total



1.2E-04



31

Sediment

Sediment

OWR

Ingestion

Cobalt

14

mg/kg

2.3E-06

(mg/kg/day)

NA

(mg/kg/day)"1



2.7E-05

(mg/kg/day)

3.0E-04

(mg/kg/day)

0.09









Nickel

1500

mg/kg

2.4E-04

(mg/kg/day)

NA

(mg/kg/day)"1



2.8E-03

(mg/kg/day)

2.0E-02

(mg/kg/day)

0.14







Exp. Route Total













0.23







Dermal

Cobalt

14

mg/kg

5.4E-08

(mg/kg/day)

NA

(mg/kg/day)"1



6.3E-07

(mg/kg/day)

3.0E-04

(mg/kg/day)

0.00









Nickel

1500

mg/kg

5.8E-06

(mg/kg/day)

NA

(mg/kg/day)"1



6.8E-05

(mg/kg/day)

8.0E-04

(mg/kg/day)

0.085







Exp. Route Total













0.09





Exposure Point Total







0.32



Exposure Medium Total







0.32

Medium Total







0.32

Total of Receptor Risks Across All Media

1.3E-04

Total of Receptor Hazards Across All Media

36

Notes:

1 - Mutagenic chemicals were evaluated in accordance with USEPA's Supplemental Guidance for Assessing Susceptibility from Early-Life Exposure to Carcinogens (2005).


-------
TABLE 7.8.RME

CALCULATION OF CHEMICAL CANCER RISKS AND NON-CANCER HAZARDS
REASONABLE MAXIMUM EXPOSURES
OLD WILMINGTON ROAD SITE
PAGE 1 OF 4

Scenario Timeframe: Future
Receptor Population: Residents

Receptor Age: Adult	

Medium

Exposure Medium

Exposure Point

Exposure Route

Chemical of

EPC

Cancer Risk Calculations

Non-Cancer Hazard Calculations









Potential Concern

Value

Units

Intake/Exposure Concentration

CSF/Unit Risk

Cancer Risk

Intake/Exposure Concentration

RfD/RfC

Hazard Quotient















Value

Units

Value

Units



Value

Units

Value

Units



Surface/Subsurface Soil

Surface/Subsurface Soil

OWR

Ingestion

Benzo(a)pyrene

0.252

mg/kg

1.7E-07

(mg/kg/day)

1.0E+00

(mg/kg/day)"

1.7E-07

3.0E-07

(mg/kg/day)

3.0E-04

(mg/kg/day)

0.0010









Naphthalene

9.8

mg/kg

3.4E-06

(mg/kg/day)

NA

(mg/kg/day)"



1.2E-05

(mg/kg/day)

2.0E-02

(mg/kg/day)

0.00059









Dieldrin

0.11

mg/kg

3.8E-08

(mg/kg/day)

1.6E+01

(mg/kg/day)"

6.0E-07

1.3E-07

(mg/kg/day)

5.0E-05

(mg/kg/day)

0.0026









Aluminum

9940

mg/kg

3.4E-03

(mg/kg/day)

NA

(mg/kg/day)"1



1.2E-02

(mg/kg/day)

1.0E+00

(mg/kg/day)

0.012









Antimony

6.48

mg/kg

2.2E-06

(mg/kg/day)

NA

(mg/kg/day)"



7.8E-06

(mg/kg/day)

4.0E-04

(mg/kg/day)

0.019









Arsenic

3.95

mg/kg

8.1E-07

(mg/kg/day)

1.5E+00

(mg/kg/day)"

1.2E-06

2.8E-06

(mg/kg/day)

3.0E-04

(mg/kg/day)

0.0095









Cobalt

6.32

mg/kg

2.2E-06

(mg/kg/day)

NA

(mg/kg/day)"



7.6E-06

(mg/kg/day)

3.0E-04

(mg/kg/day)

0.025









Copper

660

mg/kg

2.3E-04

(mg/kg/day)

NA

(mg/kg/day)"



7.9E-04

(mg/kg/day)

4.0E-02

(mg/kg/day)

0.020









Iron

19200

mg/kg

6.6E-03

(mg/kg/day)

NA

(mg/kg/day)"



2.3E-02

(mg/kg/day)

7.0E-01

(mg/kg/day)

0.033









Lead

71.4

mg/kg

2.4E-05

(mg/kg/day)

NA

(mg/kg/day)"



8.6E-05

(mg/kg/day)

NA

(mg/kg/day)











Manganese

388

mg/kg

1.3E-04

(mg/kg/day)

NA

(mg/kg/day)"



4.7E-04

(mg/kg/day)

2.4E-02

(mg/kg/day)

0.019









Thallium

2.13

mg/kg

7.3E-07

(mg/kg/day)

NA

(mg/kg/day)"



2.6E-06

(mg/kg/day)

1.0E-05

(mg/kg/day)

0.26









Vanadium

23.6

mg/kg

8.1E-06

(mg/kg/day)

NA

(mg/kg/day)"



2.8E-05

(mg/kg/day)

5.0E-03

(mg/kg/day)

0.0057









Zinc

380

mg/kg

1.3E-04

(mg/kg/day)

NA

(mg/kg/day)"



4.6E-04

(mg/kg/day)

3.0E-01

(mg/kg/day)

0.0015







Exp. Route Total





2.0E-06



0.40







Dermal

Benzo(a)pyrene

0.252

mg/kg

9.5E-08

(mg/kg/day)

1.0E+00

(mg/kg/day)"

9.5E-08

1.7E-07

(mg/kg/day)

3.0E-04

(mg/kg/day)

0.00055









Naphthalene

9.8

mg/kg

1.8E-06

(mg/kg/day)

NA

(mg/kg/day)"



6.4E-06

(mg/kg/day)

2.0E-02

(mg/kg/day)

0.00032









Dieldrin

0.11

mg/kg

1.6E-08

(mg/kg/day)

1.6E+01

(mg/kg/day)"

2.5E-07

5.6E-08

(mg/kg/day)

5.0E-05

(mg/kg/day)

0.0011









Aluminum

9940

mg/kg

1.4E-04

(mg/kg/day)

NA

(mg/kg/day)"



5.0E-04

(mg/kg/day)

1.0E+00

(mg/kg/day)

0.00050









Antimony

6.48

mg/kg

9.4E-08

(mg/kg/day)

NA

(mg/kg/day)"



3.3E-07

(mg/kg/day)

6.0E-05

(mg/kg/day)

0.0055









Arsenic

3.95

mg/kg

1.7E-07

(mg/kg/day)

1.5E+00

(mg/kg/day)"

2.6E-07

6.0E-07

(mg/kg/day)

3.0E-04

(mg/kg/day)

0.0020









Cobalt

6.32

mg/kg

9.1E-08

(mg/kg/day)

NA

(mg/kg/day)"



3.2E-07

(mg/kg/day)

3.0E-04

(mg/kg/day)

0.0011









Copper

660

mg/kg

9.5E-06

(mg/kg/day)

NA

(mg/kg/day)"



3.3E-05

(mg/kg/day)

4.0E-02

(mg/kg/day)

0.00084









Iron

19200

mg/kg

2.8E-04

(mg/kg/day)

NA

(mg/kg/day)"



9.7E-04

(mg/kg/day)

7.0E-01

(mg/kg/day)

0.0014









Lead

71.4

mg/kg

0.0E+00

(mg/kg/day)

NA

(mg/kg/day)"



0.0E+00

(mg/kg/day)

NA

(mg/kg/day)











Manganese

388

mg/kg

5.6E-06

(mg/kg/day)

NA

(mg/kg/day)"



2.0E-05

(mg/kg/day)

9.6E-04

(mg/kg/day)

0.020









Thallium

2.13

mg/kg

3.1E-08

(mg/kg/day)

NA

(mg/kg/day)"



1.1E-07

(mg/kg/day)

1.0E-05

(mg/kg/day)

0.011









Vanadium

23.6

mg/kg

3.4E-07

(mg/kg/day)

NA

(mg/kg/day)"



1.2E-06

(mg/kg/day)

1.3E-04

(mg/kg/day)

0.0092









Zinc

380

mg/kg

5.5E-06

(mg/kg/day)

NA

(mg/kg/day)"



1.9E-05

(mg/kg/day)

3.0E-01

(mg/kg/day)

0.000064







Exp. Route Total





6.1E-07



0.054





Exposure Point Total



2.6E-06



0.46



Exposure Medium Total



2.6E-06



0.46



Air

OWR

Inhalation

Benzo(a)pyrene

7.8E-11

mg/m3

4.3E-11

(mg/m3)

6.0E-04

(ug/m3)"1

2.6E-11

7.5E-11

(mg/m3)

2.0E-06

(mg/m3)

0.000037









Naphthalene

1.7E-04

mg/m3

4.5E-05

(mg/m3)

3.4E-05

(ug/m3)"1

1.5E-06

1.6E-04

(mg/m3)

3.0E-03

(mg/m3)

0.053









Dieldrin

3.4E-11

mg/m3

9.3E-12

(mg/m3)

4.6E-03

(ug/m3)"1

4.3E-11

3.3E-11

(mg/m3)

NA

(mg/m3)

-









Aluminum

3.1E-06

mg/m3

8.4E-07

(mg/m3)

NA

(ug/m3)"1



2.9E-06

(mg/m3)

5.0E-03

(mg/m3)

0.00059









Antimony

2.0E-09

mg/m3

5.5E-10

(mg/m3)

NA

(ug/m3)"1



1.9E-09

(mg/m3)

NA

(mg/m3)

-









Arsenic

1.2E-09

mg/m3

3.3E-10

(mg/m3)

4.3E-03

(ug/m3)"1

1.4E-09

1.2E-09

(mg/m3)

1.5E-05

(mg/m3)

0.000078









Cobalt

2.0E-09

mg/m3

5.3E-10

(mg/m3)

9.0E-03

(ug/m3)"1

4.8E-09

1.9E-09

(mg/m3)

6.0E-06

(mg/m3)

0.00031









Copper

2.0E-07

mg/m3

5.6E-08

(mg/m3)

NA

(ug/m3)"1



2.0E-07

(mg/m3)

NA

(mg/m3)

-









Iron

5.9E-06

mg/m3

1.6E-06

(mg/m3)

NA

(ug/m3)"1



5.7E-06

(mg/m3)

NA

(mg/m3)

-









Lead

2.2E-08

mg/m3

6.0E-09

(mg/m3)

NA

(ug/m3)"1



2.1E-08

(mg/m3)

NA

(mg/m3)

-









Manganese

1.2E-07

mg/m3

3.3E-08

(mg/m3)

NA

(ug/m3)"1



1.1E-07

(mg/m3)

5.0E-05

(mg/m3)

0.0023









Thallium

6.6E-10

mg/m3

1.8E-10

(mg/m3)

NA

(ug/m3)"1



6.3E-10

(mg/m3)

NA

(mg/m3)

-









Vanadium

7.3E-09

mg/m3

2.0E-09

(mg/m3)

NA

(ug/m3)"1



7.0E-09

(mg/m3)

1.0E-04

(mg/m3)

0.000070









Zinc

1.2E-07

mg/m3

3.2E-08

(mg/m3)

NA

(ug/m3)"1



1.1E-07

(mg/m3)

NA

(mg/m3)

-







Exp. Route Total





1.5E-06



0.056





Exposure Point Total



1.5E-06



0.056



Exposure Medium Total



1.5E-06



0.056

Medium Total



4.1E-06



0.51


-------
TABLE 7.8.RME

CALCULATION OF CHEMICAL CANCER RISKS AND NON-CANCER HAZARDS
REASONABLE MAXIMUM EXPOSURES
OLD WILMINGTON ROAD SITE
PAGE 2 OF 4

Scenario Timeframe: Future
Receptor Population: Residents

Receptor Age: Adult	

Exposure Medium

Chemical of
Potential Concern

Cancer Risk Calculations

Intake/Exposure Concentration

Value

Units

CSF/Unit Risk

Units

Non-Cancer Hazard Calculations

Intake/Exposure Concentration

Value

Units

Hazard Quotient

Value

Units

2-Butanone
2-Hexanone
Chloroform

cis-1,2-Dichloroethene
Methyl Tert-Butyl Ether
Tetrachloroethene
Trichloroethene (Mutagenic)
Trichloroethene (Nonmutagenic)
Vinyl Chloride
1,4-Dioxane

Bis(2-ethylhexyl)phthalate

Caprolactam

Aluminum

Antimony

Arsenic

Barium

Beryllium

Cadmium

Cobalt

Copper

Iron

Lead

Manganese

Mercury

Nickel

Selenium

Thallium

Vanadium

Zinc

65.7
10.6

10.6
0.57
3.84

11
2800
57655
1.31

12.8
674
3.46
0.424

63.9

75.2
45400

23.1
2525
0.128

51.7
3.1

0.539

12.3
378

2-Butanone
2-Hexanone
Chloroform

cis-1,2-Dichloroethene
Methyl Tert-Butyl Ether
Tetrachloroethene
Trichloroethene (Mutagenic)
Trichloroethene (Nonmutagenic)
Vinyl Chloride
1,4-Dioxane

Bis(2-ethylhexyl)phthalate

Caprolactam

Aluminum

Antimony

Arsenic

Barium

Beryllium

Cadmium

Cobalt

Copper

Iron

Lead

Manganese	

65.7
10.6
10.6
0.57
3.84

11
2800
57655
1.31

12.8
674
3.46
0.424

63.9
75.2

45400
23.1
2525

1.1E-02
3.5E-04
8.0E-05
1.6E-05
1.3E-04
5.6E-04
1.8E-04
9.1E-05
4.9E-06
3.3E-05
9.4E-05
2.4E-02
4.9E-01
1.1E-05
1.1E-04
5.8E-03
3.0E-05
3.6E-06
5.5E-04
6.4E-04
3.9E-01
2.0E-04
2.2E-02
1.1E-06
4.4E-04
2.7E-05
4.6E-06
1.1E-04
3.2E-03

(mg/kg/day)
(mg/kg/day)
(mg/kg/day)
(mg/kg/day)
(mg/kg/day)
(mg/kg/day)
(mg/kg/day)
(mg/kg/day)
(mg/kg/day)
(mg/kg/day)
(mg/kg/day)
(mg/kg/day)
(mg/kg/day)
(mg/kg/day)
(mg/kg/day)
(mg/kg/day)
(mg/kg/day)
(mg/kg/day)
(mg/kg/day)
(mg/kg/day)
(mg/kg/day)
(mg/kg/day)
(mg/kg/day)
(mg/kg/day)
(mg/kg/day)
(mg/kg/day)
(mg/kg/day)
(mg/kg/day)
(mg/kg/day)

NA
1.8E-03
2.1E-03
9.3E-03
3.7E-02
7.2E-01
1.0E-01
1.4E-02
NA

mg/kg/day
mg/kg/day
mg/kg/day
mg/kg/day
mg/kg/day
mg/kg/day
mg/kg/day
mg/kg/day
mg/kg/day
mg/kg/day
mg/kg/day
mg/kg/day
mg/kg/day
mg/kg/day
mg/kg/day
mg/kg/day
mg/kg/day
mg/kg/day
mg/kg/day
mg/kg/day
mg/kg/day
mg/kg/day
mg/kg/day
mg/kg/day
mg/kg/day
mg/kg/day
mg/kg/day
mg/kg/day
mg/kg/da^

9.2E-05
1.2E-05
4.2E-06
1.1E-06
1.8E-06
2.1E-04
1.8E-05
8.8E-06
1.8E-07
1.1E-07
0.0E+00
3.0E-04
2.8E-03
6.3E-08
6.1E-07
3.2E-05
1.7E-07
2.0E-08
1.2E-06
3.6E-06
2.2E-03
1.1E-07
1.2E-04

(mg/kg/day)
(mg/kg/day)
(mg/kg/day)
(mg/kg/day)
(mg/kg/day)
(mg/kg/day)
(mg/kg/day)
(mg/kg/day)
(mg/kg/day)
(mg/kg/day)
(mg/kg/day)
(mg/kg/day)
(mg/kg/day)
(mg/kg/day)
(mg/kg/day)
(mg/kg/day)
(mg/kg/day)
(mg/kg/day)
(mg/kg/day)
(mg/kg/day)
(mg/kg/day)
(mg/kg/day)
(mg/kg/day)

NA
1.8E-03
2.1E-03
9.3E-03
3.7E-02
7.2E-01
1.0E-01
1.4E-02
NA

mg/kg/day
mg/kg/day
mg/kg/day
mg/kg/day
mg/kg/day
mg/kg/day
mg/kg/day
mg/kg/day
mg/kg/day
mg/kg/day
mg/kg/day
mg/kg/day
mg/kg/day
mg/kg/day
mg/kg/day
mg/kg/day
mg/kg/day
mg/kg/day
mg/kg/day
mg/kg/day
mg/kg/day
mg/kg/day
mq/kq/das

2.3E-07
1.2E-06
1.7E-06
3.4E-06
3.5E-06
3.3E-06
1.3E-06

3.9E-02
1.2E-03
2.8E-04
5.6E-05
4.5E-04
2.0E-03
3.2E-04
3.2E-04
1.7E-05
1.2E-04
3.3E-04
8.4E-02
1.7E+00
3.9E-05
3.8E-04
2.0E-02
1.0E-04
1.3E-05
1.9E-03
2.3E-03
1.4E+00
6.9E-04
7.6E-02
3.8E-06
1.5E-03
9.3E-05
1.6E-05
3.7E-04
1.1E-02

mg/kg/day
mg/kg/day
mg/kg/day
mg/kg/day
mg/kg/day
mg/kg/day
mg/kg/day
mg/kg/day
mg/kg/day
mg/kg/day
mg/kg/day
mg/kg/day
mg/kg/day
mg/kg/day
mg/kg/day
mg/kg/day
mg/kg/day
mg/kg/day
mg/kg/day
mg/kg/day
mg/kg/day
mg/kg/day
mg/kg/day
mg/kg/day
mg/kg/day
mg/kg/day
mg/kg/day
mg/kg/day
mg/kg/day

3.3E-09
4.3E-07
1.6E-07
3.2E-07
1.3E-07
1.1E-08

3.2E-04
4.2E-05
1.5E-05
3.9E-06
6.4E-06
7.2E-04
3.1E-05
3.1E-05
6.3E-07
4.0E-07
0.0E+00
1.0E-03
9.6E-03
2.2E-07
2.1E-06
1.1E-04
5.8E-07
7.1E-08
4.3E-06
1.3E-05
7.6E-03
3.9E-07
4.2E-04

mg/kg/day
mg/kg/day
mg/kg/day
mg/kg/day
mg/kg/day
mg/kg/day
mg/kg/day
mg/kg/day
mg/kg/day
mg/kg/day
mg/kg/day
mg/kg/day
mg/kg/day
mg/kg/day
mg/kg/day
mg/kg/day
mg/kg/day
mg/kg/day
mg/kg/day
mg/kg/day
mg/kg/day
mg/kg/day
mg/kg/day

6.0E-01
5.0E-03
1.0E-02
2.0E-03

NA
6.0E-03

NA
5.0E-04
3.0E-03
3.0E-02
2.0E-02
5.0E-01
1.0E+00
4.0E-04
3.0E-04
2.0E-01
2.0E-03
5.0E-04
3.0E-04
4.0E-02
7.0E-01

NA
2.4E-02
3.0E-04
2.0E-02
5.0E-03
1.0E-05
5.0E-03
3.0E-01

mg/kg/day
mg/kg/day
mg/kg/day
mg/kg/day
mg/kg/day
mg/kg/day
mg/kg/day
mg/kg/day
mg/kg/day
mg/kg/day
mg/kg/day
mg/kg/day
mg/kg/day
mg/kg/day
mg/kg/day
mg/kg/day
mg/kg/day
mg/kg/day
mg/kg/day
mg/kg/day
mg/kg/day
mg/kg/day
mg/kg/day
mg/kg/day
mg/kg/day
mg/kg/day
mg/kg/day
mg/kg/day
mg/kg/day

6.0E-01
5.0E-03
1.0E-02
2.0E-03

NA
6.0E-03

NA
5.0E-04
3.0E-03
3.0E-02
2.0E-02
5.0E-01
1.0E+00
6.0E-05
3.0E-04
1.4E-02
1.4E-05
2.5E-05
3.0E-04
4.0E-02
7.0E-01
NA

mg/kg/day
mg/kg/day
mg/kg/day
mg/kg/day
mg/kg/day
mg/kg/day
mg/kg/day
mg/kg/day
mg/kg/day
mg/kg/day
mg/kg/day
mg/kg/day
mg/kg/day
mg/kg/day
mg/kg/day
mg/kg/day
mg/kg/day
mg/kg/day
mg/kg/day
mg/kg/day
mg/kg/day
mg/kg/day
mg/kg/day

0.065
0.25
0.028
0.028

0.64
0.0057
0.0038
0.016
0.17
1.7

0.10
0.052
0.025

0.013
0.077
0.019
1.6
0.074
0.038

18

0.00054
0.0084
0.0015
0.0019

0.06
0.00021
0.000013

0.0021
0.0096
0.0037
0.0071
0.0081
0.041
0.0028
0.014
0.00031
0.011


-------
TABLE 7.8.RME

CALCULATION OF CHEMICAL CANCER RISKS AND NON-CANCER HAZARDS
REASONABLE MAXIMUM EXPOSURES
OLD WILMINGTON ROAD SITE
PAGE 3 OF 4

Scenario Timeframe: Future
Receptor Population: Residents

Receptor Age: Adult	

Medium

Exposure Medium

Exposure Point

Exposure Route

Chemical of

EPC

Cancer Risk Calculations

Non-Cancer Hazard Calculations









Potential Concern

Value

Units

Intake/Exposure Concentration

CSF/Unit Risk

Cancer Risk

Intake/Exposure Concentration

RfD/RfC

Hazard Quotient















Value

Units

Value

Units



Value

Units

Value

Units



Groundwater

Groundwater

OWRGC

Dermal

Mercury

0.128

ug/L

6.1E-09

(mg/kg/day)

NA

(mg/kg/day)"



2.1E-08

(mg/kg/day)

2.1E-05

(mg/kg/day)

0.0010









Nickel

51.7

ug/L

4.9E-07

(mg/kg/day)

NA

(mg/kg/day)"



1.7E-06

(mg/kg/day)

8.0E-04

(mg/kg/day)

0.0022









Selenium

3.1

ug/L

1.5E-07

(mg/kg/day)

NA

(mg/kg/day)"



5.2E-07

(mg/kg/day)

5.0E-03

(mg/kg/day)

0.00010









Thallium

0.539

ug/L

2.6E-08

(mg/kg/day)

NA

(mg/kg/day)"



9.0E-08

(mg/kg/day)

1.0E-05

(mg/kg/day)

0.0090









Vanadium

12.3

ug/L

5.9E-07

(mg/kg/day)

NA

(mg/kg/day)"



2.1E-06

(mg/kg/day)

1.3E-04

(mg/kg/day)

0.016









Zinc

378

ug/L

1.1E-05

(mg/kg/day)

NA

(mg/kg/day)"



3.8E-05

(mg/kg/day)

3.0E-01

(mg/kg/day)

0.00013







Exp. Route Total





2.1E-06



0.76





Exposure Point Total



1.8E-04



19



Exposure Medium Total



1.8E-04



19



Air

OWR

Inhalation

2-Butanone

2.2E-01

mg/m3

6.0E-02

(mg/m3)

NA

(ug/m3)"1



2.1E-01

(mg/m3)

5.0E+00

(mg/m3)

0.042









2-Hexanone

8.4E-03

mg/m3

2.3E-03

(mg/m3)

NA

(ug/m3)"1



8.1E-03

(mg/m3)

3.0E-02

(mg/m3)

0.27









Chloroform

5.2E-03

mg/m3

1.4E-03

(mg/m3)

2.3E-05

(ug/m3)"1

3.3E-05

5.0E-03

(mg/m3)

9.8E-02

(mg/m3)

0.051









cis-1,2-Dichloroethene

1.1E-03

mg/m3

3.1E-04

(mg/m3)

NA

(ug/m3)"1



1.1E-03

(mg/m3)

NA

(mg/m3)

-









Methyl Tert-Butyl Ether

7.4E-03

mg/m3

2.0E-03

(mg/m3)

2.6E-07

(ug/m3)"1

5.3E-07

7.1E-03

(mg/m3)

3.0E+00

(mg/m3)

0.0024









Tetrachloroethene

3.3E-02

mg/m3

9.1E-03

(mg/m3)

2.6E-07

(ug/m3)"1

2.4E-06

3.2E-02

(mg/m3)

4.0E-02

(mg/m3)

0.79









Trichloroethene (Mutagenic)

5.8E-03

mg/m3

3.2E-03

(mg/m3)

1.0E-06

(ug/m3)"1

3.2E-06

5.6E-03

(mg/m3)

NA

(mg/m3)

-









Trichloroethene (Nonmutagenic)

5.8E-03

mg/m3

1.6E-03

(mg/m3)

3.1E-06

(ug/m3)"1

4.9E-06

5.6E-03

(mg/m3)

2.0E-03

(mg/m3)

2.8









Vinyl Chloride

4.1E-04

mg/m3

1.1E-04

(mg/m3)

4.4E-06

(ug/m3)"1

5.0E-07

4.0E-04

(mg/m3)

1.0E-01

(mg/m3)

0.0040









1,4-Dioxane

6.3E-05

mg/m3

1.7E-05

(mg/m3)

5.0E-06

(ug/m3)"1

8.6E-08

6.0E-05

(mg/m3)

3.0E-02

(mg/m3)

0.0020









Bis(2-ethylhexyl)phthalate

0.0E+00

mg/m3

0.0E+00

(mg/m3)

2.4E-06

(ug/m3)"1



0.0E+00

(mg/m3)

NA

(mg/m3)

-









Caprolactam

0.0E+00

mg/m3

0.0E+00

(mg/m3)

NA

(ug/m3)"1



0.0E+00

(mg/m3)

2.2E-03

(mg/m3)

-









Aluminum

0.0E+00

mg/m3

0.0E+00

(mg/m3)

NA

(ug/m3)"1



0.0E+00

(mg/m3)

5.0E-03

(mg/m3)

-









Antimony

0.0E+00

mg/m3

0.0E+00

(mg/m3)

NA

(ug/m3)"1



0.0E+00

(mg/m3)

NA

(mg/m3)

-









Arsenic

0.0E+00

mg/m3

0.0E+00

(mg/m3)

4.3E-03

(ug/m3)"1



0.0E+00

(mg/m3)

1.5E-05

(mg/m3)

-









Barium

0.0E+00

mg/m3

0.0E+00

(mg/m3)

NA

(ug/m3)"1



0.0E+00

(mg/m3)

5.0E-04

(mg/m3)

-









Beryllium

0.0E+00

mg/m3

0.0E+00

(mg/m3)

2.4E-03

(ug/m3)"1



0.0E+00

(mg/m3)

2.0E-05

(mg/m3)

-









Cadmium

0.0E+00

mg/m3

0.0E+00

(mg/m3)

1.8E-03

(ug/m3)"1



0.0E+00

(mg/m3)

1.0E-05

(mg/m3)

-









Cobalt

0.0E+00

mg/m3

0.0E+00

(mg/m3)

9.0E-03

(ug/m3)"1



0.0E+00

(mg/m3)

6.0E-06

(mg/m3)

-









Copper

0.0E+00

mg/m3

0.0E+00

(mg/m3)

NA

(ug/m3)"1



0.0E+00

(mg/m3)

NA

(mg/m3)

-









Iron

0.0E+00

mg/m3

0.0E+00

(mg/m3)

NA

(ug/m3)"1



0.0E+00

(mg/m3)

NA

(mg/m3)

-









Lead

0.0E+00

mg/m3

0.0E+00

(mg/m3)

NA

(ug/m3)"1



0.0E+00

(mg/m3)

NA

(mg/m3)

-









Manganese

0.0E+00

mg/m3

0.0E+00

(mg/m3)

NA

(ug/m3)"1



0.0E+00

(mg/m3)

5.0E-05

(mg/m3)

-









Mercury

0.0E+00

mg/m3

0.0E+00

(mg/m3)

NA

(ug/m3)"1



0.0E+00

(mg/m3)

3.0E-04

(mg/m3)

-









Nickel

0.0E+00

mg/m3

0.0E+00

(mg/m3)

2.6E-04

(ug/m3)"1



0.0E+00

(mg/m3)

9.0E-05

(mg/m3)

-









Selenium

0.0E+00

mg/m3

0.0E+00

(mg/m3)

NA

(ug/m3)"1



0.0E+00

(mg/m3)

2.0E-02

(mg/m3)

-









Thallium

0.0E+00

mg/m3

0.0E+00

(mg/m3)

NA

(ug/m3)"1



0.0E+00

(mg/m3)

NA

(mg/m3)

-









Vanadium

0.0E+00

mg/m3

0.0E+00

(mg/m3)

NA

(ug/m3)"1



0.0E+00

(mg/m3)

1.0E-04

(mg/m3)

-









Zinc

0.0E+00

mg/m3

0.0E+00

(mg/m3)

NA

(ug/m3)"1



0.0E+00

(mg/m3)

NA

(mg/m3)

-







Exp. Route Total





4.4E-05



3.9





Exposure Point Total



4.4E-05



3.9



Exposure Medium Total



4.4E-05



3.9

Medium Total



2.3E-04



23


-------
TABLE 7.8.RME

CALCULATION OF CHEMICAL CANCER RISKS AND NON-CANCER HAZARDS
REASONABLE MAXIMUM EXPOSURES
OLD WILMINGTON ROAD SITE
PAGE 4 OF 4

Scenario Timeframe: Future
Receptor Population: Residents

Receptor Age: Adult	

Medium

Exposure Medium

Exposure Point Exposure Route Chemical of

EPC

Cancer Risk Calculations

Non-Cancer Hazard Calculations





Potential Concern

Value

Units

Intake/Exposure Concentration

CSF/Unit Risk

Cancer Risk

Intake/Exposure Concentration

RfD/RfC

Hazard Quotient





I |





Value

Units

Value

Units



Value

Units

Value

Units



Sediment

Sediment

OWR I Ingestion j Cobalt

14

mg/kg

7.1E-07

(mg/kg/day)

NA

(mg/kg/day)"1



2.5E-06

(mg/kg/day)

3.0E-04

(mg/kg/day)

0.008





[Nickel

1500

mg/kg

7.6E-05

(mg/kg/day)

NA

(mg/kg/day)"1



2.7E-04

(mg/kg/day)

2.0E-02

(mg/kg/day)

0.013





| Exp. Route Total jj







0.022





| Dermal [Cobalt

14

mg/kg

3.0E-08

(mg/kg/day)

NA

(mg/kg/day)"1



1.1E-07

(mg/kg/day)

3.0E-04

(mg/kg/day)

0.000





[Nickel

1500

mg/kg

3.2E-06

(mg/kg/day)

NA

(mg/kg/day)"1



1.1E-05

(mg/kg/day)

8.0E-04

(mg/kg/day)

0.014





|j Exp. Route Total |f







0.014





Exposure Point Total







0.036



Exposure Medium Total







0.036

Medium Total







0.036

Total of Receptor Risks Across All Media

2.3E-04

Total of Receptor Hazards Across All Media

23

Notes:

1 - Mutagenic chemicals were evaluated in accordance with USEPA's Supplemental Guidance for Assessing Susceptibility from Early-Life Exposure to Carcinogens (2005).


-------
TABLE 7.9.RME

CALCULATION OF CHEMICAL CANCER RISKS AND NON-CANCER HAZARDS
REASONABLE MAXIMUM EXPOSURES
OLD WILMINGTON ROAD SITE
PAGE 1 OF 4

Scenario Timeframe: Future
Receptor Population: Residents

Receptor Age: Lifelong (Child and Adult)	

Medium

Exposure Medium

Exposure Point

Exposure Route

Chemical of

EPC

Cancer Risk Calculations

Non-Cancer Hazard Calculations









Potential Concern

Value

Units

Intake/Exposure Concentration

CSF/Unit Risk

Cancer Risk

Intake/Exposure Concentration

RfD/RfC

Hazard Quotient















Value

Units

Value

Units



Value

Units

Value

Units



Surface/Subsurface Soil

Surface/Subsurface Soil

OWR

Ingestion

Benzo(a)pyrene

0.252

mg/kg

1.6E-06

(mg/kg/day)

1.0E+00

(mg/kg/day)"

1.6E-06



















Naphthalene

9.8

mg/kg

1.4E-05

(mg/kg/day)

NA

(mg/kg/day)"





















Dieldrin

0.11

mg/kg

1.6E-07

(mg/kg/day)

1.6E+01

(mg/kg/day)"

2.5E-06



















Aluminum

9940

mg/kg

1.4E-02

(mg/kg/day)

NA

(mg/kg/day)"





















Antimony

6.48

mg/kg

9.3E-06

(mg/kg/day)

NA

(mg/kg/day)"





















Arsenic

3.95

mg/kg

3.4E-06

(mg/kg/day)

1.5E+00

(mg/kg/day)"

5.1E-06



















Cobalt

6.32

mg/kg

9.1E-06

(mg/kg/day)

NA

(mg/kg/day)"





















Copper

660

mg/kg

9.5E-04

(mg/kg/day)

NA

(mg/kg/day)"





















Iron

19200

mg/kg

2.8E-02

(mg/kg/day)

NA

(mg/kg/day)"





















Lead

71.4

mg/kg

1.0E-04

(mg/kg/day)

NA

(mg/kg/day)"





















Manganese

388

mg/kg

5.6E-04

(mg/kg/day)

NA

(mg/kg/day)"





















Thallium

2.13

mg/kg

3.1E-06

(mg/kg/day)

NA

(mg/kg/day)"





















Vanadium

23.6

mg/kg

3.4E-05

(mg/kg/day)

NA

(mg/kg/day)"





















Zinc

380

mg/kg

5.5E-04

(mg/kg/day)

NA

(mg/kg/day)"



















Exp. Route Total





9.3E-06











Dermal

Benzo(a)pyrene

0.252

mg/kg

5.5E-07

(mg/kg/day)

1.0E+00

(mg/kg/day)"

5.5E-07



















Naphthalene

9.8

mg/kg

5.2E-06

(mg/kg/day)

NA

(mg/kg/day)"





















Dieldrin

0.11

mg/kg

4.5E-08

(mg/kg/day)

1.6E+01

(mg/kg/day)"

7.1E-07



















Aluminum

9940

mg/kg

4.0E-04

(mg/kg/day)

NA

(mg/kg/day)"





















Antimony

6.48

mg/kg

2.6E-07

(mg/kg/day)

NA

(mg/kg/day)"





















Arsenic

3.95

mg/kg

4.8E-07

(mg/kg/day)

1.5E+00

(mg/kg/day)"

7.2E-07



















Cobalt

6.32

mg/kg

2.6E-07

(mg/kg/day)

NA

(mg/kg/day)"





















Copper

660

mg/kg

2.7E-05

(mg/kg/day)

NA

(mg/kg/day)"





















Iron

19200

mg/kg

7.8E-04

(mg/kg/day)

NA

(mg/kg/day)"





















Lead

71.4

mg/kg

0.0E+00

(mg/kg/day)

NA

(mg/kg/day)"





















Manganese

388

mg/kg

1.6E-05

(mg/kg/day)

NA

(mg/kg/day)"





















Thallium

2.13

mg/kg

8.6E-08

(mg/kg/day)

NA

(mg/kg/day)"





















Vanadium

23.6

mg/kg

9.5E-07

(mg/kg/day)

NA

(mg/kg/day)"





















Zinc

380

mg/kg

1.5E-05

(mg/kg/day)

NA

(mg/kg/day)"



















Exp. Route Total





2.0E-06









Exposure Point Total



1.1E-05







Exposure Medium Total



1.1E-05







Air

OWR

Inhalation

Benzo(a)pyrene

7.8E-11

mg/m3

7.7E-11

(mg/m3)

6.0E-04

(ug/m3)"1

4.6E-11



















Naphthalene

1.7E-04

mg/m3

5.9E-05

(mg/m3)

3.4E-05

(ug/m3)"1

2.0E-06



















Dieldrin

3.4E-11

mg/m3

1.2E-11

(mg/m3)

4.6E-03

(ug/m3)"1

5.6E-11



















Aluminum

3.1E-06

mg/m3

1.1E-06

(mg/m3)

NA

(ug/m3)"1





















Antimony

2.0E-09

mg/m3

7.1E-10

(mg/m3)

NA

(ug/m3)"1





















Arsenic

1.2E-09

mg/m3

4.3E-10

(mg/m3)

4.3E-03

(ug/m3)"1

1.9E-09



















Cobalt

2.0E-09

mg/m3

6.9E-10

(mg/m3)

9.0E-03

(ug/m3)"1

6.3E-09



















Copper

2.0E-07

mg/m3

7.3E-08

(mg/m3)

NA

(ug/m3)"1





















Iron

5.9E-06

mg/m3

2.1E-06

(mg/m3)

NA

(ug/m3)"1





















Lead

2.2E-08

mg/m3

7.8E-09

(mg/m3)

NA

(ug/m3)"1





















Manganese

1.2E-07

mg/m3

4.3E-08

(mg/m3)

NA

(ug/m3)"1





















Thallium

6.6E-10

mg/m3

2.3E-10

(mg/m3)

NA

(ug/m3)"1





















Vanadium

7.3E-09

mg/m3

2.6E-09

(mg/m3)

NA

(ug/m3)"1





















Zinc

1.2E-07

mg/m3

4.2E-08

(mg/m3)

NA

(ug/m3)"1



















Exp. Route Total





2.0E-06









Exposure Point Total



2.0E-06







Exposure Medium Total



2.0E-06





Medium Total



1.3E-05






-------
TABLE 7.9.RME

CALCULATION OF CHEMICAL CANCER RISKS AND NON-CANCER HAZARDS
REASONABLE MAXIMUM EXPOSURES
OLD WILMINGTON ROAD SITE
PAGE 2 OF 4

Scenario Timeframe: Future
Receptor Population: Residents

Receptor Age: Lifelong (Child and Adult)	

Exposure Medium

Exposure Route

Chemical of

EPC

Cancer Risk Calculations

Non-Cancer Hazard Calculations



Potential Concern

Value

Units

Intake/Exposure Concentration

CSF/Unit Risk

Cancer Risk

Intake/Exposure Concentration

RfD/RfC

Hazard Quotient









Value

Units

Value

Units



Value

Units

Value

Units



Ingestion

2-Butanone
2-Hexanone

1300
41

ug/L
ug/L

1.7E-02
5.3E-04

(mg/kg/day)
(mg/kg/day)

NA
NA

(mg/kg/day)"
(mg/kg/day)"















Chloroform

9.4

ug/L

1.2E-04

(mg/kg/day)

3.1E-02

(mg/kg/day)"

3.7E-06













cis-1,2-Dichloroethene

1.88

ug/L

2.4E-05

(mg/kg/day)

NA

(mg/kg/day)"















Methyl Tert-Butyl Ether

15

ug/L

1.9E-04

(mg/kg/day)

1.8E-03

(mg/kg/day)"

3.5E-07













Tetrachloroethene

65.7

ug/L

8.4E-04

(mg/kg/day)

2.1E-03

(mg/kg/day)"

1.8E-06













Trichloroethene (Mutagenic)

10.6

ug/L

4.2E-04

(mg/kg/day)

9.3E-03

(mg/kg/day)"

3.9E-06













Trichloroethene (Nonmutagenic

10.6

ug/L

1.4E-04

(mg/kg/day)

3.7E-02

(mg/kg/day)"

5.0E-06













Vinyl Chloride

0.57

ug/L

3.7E-05

(mg/kg/day)

7.2E-01

(mg/kg/day)"

2.7E-05













1,4-Dioxane

3.84

ug/L

4.9E-05

(mg/kg/day)

1.0E-01

(mg/kg/day)"

4.9E-06













Bis(2-ethylhexyl)phthalate

11

ug/L

1.4E-04

(mg/kg/day)

1.4E-02

(mg/kg/day)"

2.0E-06













Caprolactam

2800

ug/L

3.6E-02

(mg/kg/day)

NA

(mg/kg/day)"















Aluminum

57655

ug/L

7.4E-01

(mg/kg/day)

NA

(mg/kg/day)"















Antimony

1.31

ug/L

1.7E-05

(mg/kg/day)

NA

(mg/kg/day)"















Arsenic

12.8

ug/L

1.6E-04

(mg/kg/day)

1.5E+00

(mg/kg/day)"

2.5E-04













Barium

674

ug/L

8.7E-03

(mg/kg/day)

NA

(mg/kg/day)"















Beryllium

3.46

ug/L

4.4E-05

(mg/kg/day)

NA

(mg/kg/day)"















Cadmium

0.424

ug/L

5.4E-06

(mg/kg/day)

NA

(mg/kg/day)"















Cobalt

63.9

ug/L

8.2E-04

(mg/kg/day)

NA

(mg/kg/day)"















Copper

75.2

ug/L

9.7E-04

(mg/kg/day)

NA

(mg/kg/day)"















Iron

45400

ug/L

5.8E-01

(mg/kg/day)

NA

(mg/kg/day)"















Lead

23.1

ug/L

3.0E-04

(mg/kg/day)

NA

(mg/kg/day)"















Manganese

2525

ug/L

3.2E-02

(mg/kg/day)

NA

(mg/kg/day)"















Mercury

0.128

ug/L

1.6E-06

(mg/kg/day)

NA

(mg/kg/day)"















Nickel

51.7

ug/L

6.6E-04

(mg/kg/day)

NA

(mg/kg/day)"















Selenium

3.1

ug/L

4.0E-05

(mg/kg/day)

NA

(mg/kg/day)"















Thallium

0.539

ug/L

6.9E-06

(mg/kg/day)

NA

(mg/kg/day)"















Vanadium

12.3

ug/L

1.6E-04

(mg/kg/day)

NA

(mg/kg/day)"















Zinc

378

ug/L

4.9E-03

(mg/kg/day)

NA

(mg/kg/day)"













Exp. Route Total





2.9E-04





Dermal

2-Butanone
2-Hexanone

1300
41

ug/L
ug/L

1.4E-04
1.8E-05

(mg/kg/day)
(mg/kg/day)

NA
NA

(mg/kg/day)"
(mg/kg/day)"















Chloroform

9.4

ug/L

7.4E-06

(mg/kg/day)

3.1E-02

(mg/kg/day)"

2.3E-07













cis-1,2-Dichloroethene

1.88

ug/L

2.0E-06

(mg/kg/day)

NA

(mg/kg/day)"















Methyl Tert-Butyl Ether

15

ug/L

3.1E-06

(mg/kg/day)

1.8E-03

(mg/kg/day)"

5.6E-09













Tetrachloroethene

65.7

ug/L

3.5E-04

(mg/kg/day)

2.1E-03

(mg/kg/day)"

7.4E-07













Trichloroethene (Mutagenic)

10.6

ug/L

5.3E-05

(mg/kg/day)

9.3E-03

(mg/kg/day)"

4.9E-07













Trichloroethene (Nonmutagenic

10.6

ug/L

1.5E-05

(mg/kg/day)

3.7E-02

(mg/kg/day)"

5.7E-07













Vinyl Chloride

0.57

ug/L

2.3E-06

(mg/kg/day)

7.2E-01

(mg/kg/day)"

1.7E-06













1,4-Dioxane

3.84

ug/L

1.6E-07

(mg/kg/day)

1.0E-01

(mg/kg/day)"

1.6E-08













Bis(2-ethylhexyl)phthalate

11

ug/L

0.0E+00

(mg/kg/day)

1.4E-02

(mg/kg/day)"















Caprolactam

2800

ug/L

4.3E-04

(mg/kg/day)

NA

(mg/kg/day)"















Aluminum

57655

ug/L

3.8E-03

(mg/kg/day)

NA

(mg/kg/day)"















Antimony

1.31

ug/L

8.7E-08

(mg/kg/day)

NA

(mg/kg/day)"















Arsenic

12.8

ug/L

8.5E-07

(mg/kg/day)

1.5E+00

(mg/kg/day)"

1.3E-06













Barium

674

ug/L

4.5E-05

(mg/kg/day)

NA

(mg/kg/day)"















Beryllium

3.46

ug/L

2.3E-07

(mg/kg/day)

NA

(mg/kg/day)"















Cadmium

0.424

ug/L

2.8E-08

(mg/kg/day)

NA

(mg/kg/day)"















Cobalt

63.9

ug/L

1.7E-06

(mg/kg/day)

NA

(mg/kg/day)"















Copper

75.2

ug/L

5.0E-06

(mg/kg/day)

NA

(mg/kg/day)"















Iron

45400

ug/L

3.0E-03

(mg/kg/day)

NA

(mg/kg/day)"















Lead

23.1

ug/L

1.5E-07

(mg/kg/day)

NA

(mg/kg/day)"















Manganese

2525

ug/L

1.7E-04

(mg/kg/day)

NA

(mq/kq/dav)













Groundwater

Groundwater


-------
TABLE 7.9.RME

CALCULATION OF CHEMICAL CANCER RISKS AND NON-CANCER HAZARDS
REASONABLE MAXIMUM EXPOSURES
OLD WILMINGTON ROAD SITE
PAGE 3 OF 4

Scenario Timeframe: Future
Receptor Population: Residents

Receptor Age: Lifelong (Child and Adult)	

Medium

Exposure Medium

Exposure Point

Exposure Route

Chemical of

EPC

Cancer Risk Calculations

Non-Cancer Hazard Calculations









Potential Concern

Value

Units

Intake/Exposure Concentration

CSF/Unit Risk

Cancer Risk

Intake/Exposure Concentration

RfD/RfC

Hazard Quotient















Value

Units

Value

Units



Value

Units

Value

Units



Groundwater

Groundwater

OWRGC

Dermal

Mercury

0.128

ug/L

8.5E-09

(mg/kg/day)

NA

(mg/kg/day)"





















Nickel

51.7

ug/L

6.9E-07

(mg/kg/day)

NA

(mg/kg/day)"





















Selenium

3.1

ug/L

2.1E-07

(mg/kg/day)

NA

(mg/kg/day)"





















Thallium

0.539

ug/L

3.6E-08

(mg/kg/day)

NA

(mg/kg/day)"





















Vanadium

12.3

ug/L

8.2E-07

(mg/kg/day)

NA

(mg/kg/day)"





















Zinc

378

ug/L

1.5E-05

(mg/kg/day)

NA

(mg/kg/day)"



















Exp. Route Total





5.0E-06









Exposure Point Total



3.0E-04







Exposure Medium Total



3.0E-04







Air

OWR

Inhalation

2-Butanone

2.2E-01

mg/m3

6.0E-02

(mg/m3)

NA

(ug/m3)"1





















2-Hexanone

8.4E-03

mg/m3

2.3E-03

(mg/m3)

NA

(ug/m3)"1





















Chloroform

5.2E-03

mg/m3

1.4E-03

(mg/m3)

2.3E-05

(ug/m3)"1

3.3E-05



















cis-1,2-Dichloroethene

1.1E-03

mg/m3

3.1E-04

(mg/m3)

NA

(ug/m3)"1





















Methyl Tert-Butyl Ether

7.4E-03

mg/m3

2.0E-03

(mg/m3)

2.6E-07

(ug/m3)"1

5.3E-07



















Tetrachloroethene

3.3E-02

mg/m3

9.1E-03

(mg/m3)

2.6E-07

(ug/m3)"1

2.4E-06



















Trichloroethene (Mutagenic)

5.8E-03

mg/m3

3.2E-03

(mg/m3)

1.0E-06

(ug/m3)"1

3.2E-06



















Trichloroethene (Nonmutagenic

5.8E-03

mg/m3

1.6E-03

(mg/m3)

3.1E-06

(ug/m3)"1

4.9E-06



















Vinyl Chloride

4.1E-04

mg/m3

1.1E-04

(mg/m3)

4.4E-06

(ug/m3)"1

5.0E-07



















1,4-Dioxane

6.3E-05

mg/m3

1.7E-05

(mg/m3)

5.0E-06

(ug/m3)"1

8.6E-08



















Bis(2-ethylhexyl)phthalate

0.0E+00

mg/m3

0.0E+00

(mg/m3)

2.4E-06

(ug/m3)"1





















Caprolactam

0.0E+00

mg/m3

0.0E+00

(mg/m3)

NA

(ug/m3)"1





















Aluminum

0.0E+00

mg/m3

0.0E+00

(mg/m3)

NA

(ug/m3)"1





















Antimony

0.0E+00

mg/m3

0.0E+00

(mg/m3)

NA

(ug/m3)"1





















Arsenic

0.0E+00

mg/m3

0.0E+00

(mg/m3)

4.3E-03

(ug/m3)"1





















Barium

0.0E+00

mg/m3

0.0E+00

(mg/m3)

NA

(ug/m3)"1





















Beryllium

0.0E+00

mg/m3

0.0E+00

(mg/m3)

2.4E-03

(ug/m3)"1





















Cadmium

0.0E+00

mg/m3

0.0E+00

(mg/m3)

1.8E-03

(ug/m3)"1





















Cobalt

0.0E+00

mg/m3

0.0E+00

(mg/m3)

9.0E-03

(ug/m3)"1





















Copper

0.0E+00

mg/m3

0.0E+00

(mg/m3)

NA

(ug/m3)"1





















Iron

0.0E+00

mg/m3

0.0E+00

(mg/m3)

NA

(ug/m3)"1





















Lead

0.0E+00

mg/m3

0.0E+00

(mg/m3)

NA

(ug/m3)"1





















Manganese

0.0E+00

mg/m3

0.0E+00

(mg/m3)

NA

(ug/m3)"1





















Mercury

0.0E+00

mg/m3

0.0E+00

(mg/m3)

NA

(ug/m3)"1





















Nickel

0.0E+00

mg/m3

0.0E+00

(mg/m3)

2.6E-04

(ug/m3)"1





















Selenium

0.0E+00

mg/m3

0.0E+00

(mg/m3)

NA

(ug/m3)"1





















Thallium

0.0E+00

mg/m3

0.0E+00

(mg/m3)

NA

(ug/m3)"1





















Vanadium

0.0E+00

mg/m3

0.0E+00

(mg/m3)

NA

(ug/m3)"1





















Zinc

0.0E+00

mg/m3

0.0E+00

(mg/m3)

NA

(ug/m3)"1



















Exp. Route Total





4.4E-05









Exposure Point Total



4.4E-05







Exposure Medium Total



4.4E-05





Medium Total



3.4E-04






-------
TABLE 7.9.RME

CALCULATION OF CHEMICAL CANCER RISKS AND NON-CANCER HAZARDS
REASONABLE MAXIMUM EXPOSURES
OLD WILMINGTON ROAD SITE
PAGE 4 OF 4

Scenario Timeframe: Future
Receptor Population: Residents

Receptor Age: Lifelong (Child and Adult)	

Medium

Exposure Medium

Exposure Point

Exposure Route Chemical of

EPC

Cancer Risk Calculations

Non-Cancer Hazard Calculations







Potential Concern

Value

Units

Intake/Exposure Concentration

CSF/Unit Risk

Cancer Risk

Intake/Exposure Concentration

RfD/RfC

Hazard Quotient







|





Value

Units

Value

Units



Value

Units

Value

Units



Sediment

Sediment

OWR

Ingestion Cobalt

14

mg/kg

3.0E-06

(mg/kg/day)

NA

(mg/kg/day)"1



















[Nickel

1500

mg/kg

3.2E-04

(mg/kg/day)

NA

(mg/kg/day)"1

















I Exp. Route Total |















Dermal jCobalt

14

mg/kg

8.4E-08

(mg/kg/day)

NA

(mg/kg/day)"1



















| Nickel

1500

mg/kg

9.0E-06

(mg/kg/day)

NA

(mg/kg/day)"1



















Exp. Route Total jj

















Exposure Point Total











Exposure Medium Total











Medium Total









Total of Receptor Risks Across All Media

3.6E-04





Notes:

1 - Mutagenic chemicals were evaluated in accordance with USEPA's Supplemental Guidance for Assessing Susceptibility from Early-Life Exposure to Carcinogens (2005).


-------
TABLE 7.1 .CTE

CALCULATION OF CHEMICAL CANCER RISKS AND NON-CANCER HAZARDS
CENTRAL TENDENCY EXPOSURES
OLD WILMINGTON ROAD SITE
PAGE 1 OF 1

Scenario Timeframe: Current

Receptor Population: Industrial Workers

Receptor Age: Adult	

Medium

Exposure Medium

Exposure Point

Exposure Route

Chemical of

EPC

Cancer Risk Calculations

Non-Cancer Hazard Calculations









Potential Concern

Value

Units

Intake/Exposure Concentration

CSF/Unit Risk

Cancer Risk

Intake/Exposure Concentration

RfD/RfC

Hazard Quotient















Value

Units

Value

Units



Value

Units

Value

Units



Surface Soil

Surface Soil

OWR

Ingestion

Benzo(a)pyrene

0.286

mg/kg

1.1E-08

(mg/kg/day)

1.0E+00

(mg/kg/day)"

1.1E-08

1.1E-07

(mg/kg/day)

3.0E-04

(mg/kg/day)

0.00036









Naphthalene

9.8

mg/kg

3.7E-07

(mg/kg/day)

NA

(mg/kg/day)"



3.7E-06

(mg/kg/day)

2.0E-02

(mg/kg/day)

0.00018









Dieldrin

0.11

mg/kg

4.1E-09

(mg/kg/day)

1.6E+01

(mg/kg/day)"

6.6E-08

4.1E-08

(mg/kg/day)

5.0E-05

(mg/kg/day)

0.00083









Aluminum

12000

mg/kg

4.5E-04

(mg/kg/day)

NA

(mg/kg/day)"



4.5E-03

(mg/kg/day)

1.0E+00

(mg/kg/day)

0.0045









Antimony

11.3

mg/kg

4.2E-07

(mg/kg/day)

NA

(mg/kg/day)"



4.2E-06

(mg/kg/day)

4.0E-04

(mg/kg/day)

0.011









Arsenic

5.28

mg/kg

1.2E-07

(mg/kg/day)

1.5E+00

(mg/kg/day)"

1.8E-07

1.2E-06

(mg/kg/day)

3.0E-04

(mg/kg/day)

0.0040









Cobalt

7.59

mg/kg

2.8E-07

(mg/kg/day)

NA

(mg/kg/day)"



2.8E-06

(mg/kg/day)

3.0E-04

(mg/kg/day)

0.0095









Copper

1240

mg/kg

4.7E-05

(mg/kg/day)

NA

(mg/kg/day)"



4.7E-04

(mg/kg/day)

4.0E-02

(mg/kg/day)

0.012









Iron

20200

mg/kg

7.6E-04

(mg/kg/day)

NA

(mg/kg/day)"



7.6E-03

(mg/kg/day)

7.0E-01

(mg/kg/day)

0.011









Lead

131

mg/kg

4.9E-06

(mg/kg/day)

NA

(mg/kg/day)"



4.9E-05

(mg/kg/day)

NA

(mg/kg/day)











Manganese

456

mg/kg

1.7E-05

(mg/kg/day)

NA

(mg/kg/day)"



1.7E-04

(mg/kg/day)

2.4E-02

(mg/kg/day)

0.0071









Vanadium

27

mg/kg

1.0E-06

(mg/kg/day)

NA

(mg/kg/day)"



1.0E-05

(mg/kg/day)

5.0E-03

(mg/kg/day)

0.0020









Zinc

705

mg/kg

2.6E-05

(mg/kg/day)

NA

(mg/kg/day)"



2.6E-04

(mg/kg/day)

3.0E-01

(mg/kg/day)

0.00088







Exp. Route Total





2.5E-07



0.062







Dermal

Benzo(a)pyrene

0.286

mg/kg

2.0E-09

(mg/kg/day)

1.0E+00

(mg/kg/day)"

2.0E-09

2.0E-08

(mg/kg/day)

3.0E-04

(mg/kg/day)

0.000066









Naphthalene

9.8

mg/kg

6.7E-08

(mg/kg/day)

NA

(mg/kg/day)"



6.7E-07

(mg/kg/day)

2.0E-02

(mg/kg/day)

0.000034









Dieldrin

0.11

mg/kg

5.8E-10

(mg/kg/day)

1.6E+01

(mg/kg/day)"

9.3E-09

5.8E-09

(mg/kg/day)

5.0E-05

(mg/kg/day)

0.00012









Aluminum

12000

mg/kg

6.3E-06

(mg/kg/day)

NA

(mg/kg/day)"



6.3E-05

(mg/kg/day)

1.0E+00

(mg/kg/day)

0.000063









Antimony

11.3

mg/kg

6.0E-09

(mg/kg/day)

NA

(mg/kg/day)"



6.0E-08

(mg/kg/day)

6.0E-05

(mg/kg/day)

0.00100









Arsenic

5.28

mg/kg

8.4E-09

(mg/kg/day)

1.5E+00

(mg/kg/day)"

1.3E-08

8.4E-08

(mg/kg/day)

3.0E-04

(mg/kg/day)

0.00028









Cobalt

7.59

mg/kg

4.0E-09

(mg/kg/day)

NA

(mg/kg/day)"



4.0E-08

(mg/kg/day)

3.0E-04

(mg/kg/day)

0.00013









Copper

1240

mg/kg

6.6E-07

(mg/kg/day)

NA

(mg/kg/day)"



6.6E-06

(mg/kg/day)

4.0E-02

(mg/kg/day)

0.00016









Iron

20200

mg/kg

1.1E-05

(mg/kg/day)

NA

(mg/kg/day)"



1.1E-04

(mg/kg/day)

7.0E-01

(mg/kg/day)

0.00015









Lead

131

mg/kg

0.0E+00

(mg/kg/day)

NA

(mg/kg/day)"



0.0E+00

(mg/kg/day)

NA

(mg/kg/day)











Manganese

456

mg/kg

2.4E-07

(mg/kg/day)

NA

(mg/kg/day)"



2.4E-06

(mg/kg/day)

9.6E-04

(mg/kg/day)

0.0025









Vanadium

27

mg/kg

1.4E-08

(mg/kg/day)

NA

(mg/kg/day)"



1.4E-07

(mg/kg/day)

1.3E-04

(mg/kg/day)

0.0011









Zinc

705

mg/kg

3.7E-07

(mg/kg/day)

NA

(mg/kg/day)"



3.7E-06

(mg/kg/day)

3.0E-01

(mg/kg/day)

0.000012







Exp. Route Total





2.4E-08



0.0056





Exposure Point Total



2.8E-07



0.068



Exposure Medium Total



2.8E-07



0.068



Air

OWR

Inhalation

Benzo(a)pyrene

8.8E-11

mg/m3

1.8E-12

(mg/m3)

6.0E-04

(ug/m3)"1

1.1E-12

1.8E-11

(mg/m3)

2.0E-06

(mg/m3)

0.0000088









Naphthalene

1.7E-04

mg/m3

3.3E-06

(mg/m3)

3.4E-05

(ug/m3)"1

1.1E-07

3.3E-05

(mg/m3)

3.0E-03

(mg/m3)

0.011









Dieldrin

3.4E-11

mg/m3

6.8E-13

(mg/m3)

4.6E-03

(ug/m3)"1

3.1E-12

6.8E-12

(mg/m3)

NA

(mg/m3)











Aluminum

3.7E-06

mg/m

7.4E-08

(mg/m3)

NA

(ug/m3)"1



7.4E-07

(mg/m3)

5.0E-03

(mg/m3)

0.00015









Antimony

3.5E-09

mg/m3

7.0E-11

(mg/m3)

NA

(ug/m3)"1



7.0E-10

(mg/m3)

NA

(mg/m3)











Arsenic

1.6E-09

mg/m3

3.3E-11

(mg/m3)

4.3E-03

(ug/m3)"1

1.4E-10

3.3E-10

(mg/m3)

1.5E-05

(mg/m3)

0.000022









Cobalt

2.3E-09

mg/m3

4.7E-11

(mg/m3)

9.0E-03

(ug/m3)"1

4.2E-10

4.7E-10

(mg/m3)

6.0E-06

(mg/m3)

0.000078









Copper

3.8E-07

mg/m3

7.7E-09

(mg/m3)

NA

(ug/m3)"1



7.7E-08

(mg/m3)

NA

(mg/m3)











Iron

6.2E-06

mg/m3

1.2E-07

(mg/m3)

NA

(ug/m3)"1



1.2E-06

(mg/m3)

NA

(mg/m3)











Lead

4.0E-08

mg/m3

8.1E-10

(mg/m3)

NA

(ug/m3)"1



8.1E-09

(mg/m3)

NA

(mg/m3)











Manganese

1.4E-07

mg/m3

2.8E-09

(mg/m3)

NA

(ug/m3)"1



2.8E-08

(mg/m3)

5.0E-05

(mg/m3)

0.00056









Vanadium

8.3E-09

mg/m3

1.7E-10

(mg/m3)

NA

(ug/m3)"1



1.7E-09

(mg/m3)

1.0E-04

(mg/m3)

0.000017









Zinc

2.2E-07

mg/m3

4.4E-09

(mg/m3)

NA

(ug/m3)"1



4.4E-08

(mg/m3)

NA

(mg/m3)









Exp. Route Total





1.1E-07



0.012





Exposure Point Total



1.1E-07



0.012



Exposure Medium Total



1.1E-07



0.012

Medium Total



3.9E-07



0.080

Total of Receptor Risks Across All Media

3.9E-07

Total of Receptor Hazards Across All Media

0.080

Notes:

1 - Mutagenic chemicals were evaluated in accordance with USEPA's Supplemental Guidance for Assessing Susceptibility from Early-Life Exposure to Carcinogens (2005).


-------
TABLE 7.2.CTE

CALCULATION OF CHEMICAL CANCER RISKS AND NON-CANCER HAZARDS
CENTRAL TENDENCY EXPOSURES
OLD WILMINGTON ROAD SITE
PAGE 1 OF 2

Scenario Timeframe: Current
Receptor Population: Residents

Receptor Age: Child	

Medium

Exposure Medium

Exposure Point

Exposure Route

Chemical of

EPC

Cancer Risk Calculations

Non-Cancer Hazard Calculations









Potential Concern

Value

Units

Intake/Exposure Concentration

CSF/Unit Risk

Cancer Risk

Intake/Exposure Concentration

RfD/RfC

Hazard Quotient















Value

Units

Value

Units



Value

Units

Value

Units



Surface Soil

Surface Soil

OWR

Ingestion

Benzo(a)pyrene

0.286

mg/kg

2.3E-07

(mg/kg/day)

1.0E+00

(mg/kg/day)"

2.3E-07

1.2E-06

(mg/kg/day)

3.0E-04

(mg/kg/day)

0.0041









Naphthalene

9.8

mg/kg

1.2E-06

(mg/kg/day)

NA

(mg/kg/day)"



4.2E-05

(mg/kg/day)

2.0E-02

(mg/kg/day)

0.0021









Dieldrin

0.11

mg/kg

1.3E-08

(mg/kg/day)

1.6E+01

(mg/kg/day)"

2.1E-07

4.7E-07

(mg/kg/day)

5.0E-05

(mg/kg/day)

0.0094









Aluminum

12000

mg/kg

1.5E-03

(mg/kg/day)

NA

(mg/kg/day)"



5.1E-02

(mg/kg/day)

1.0E+00

(mg/kg/day)

0.051









Antimony

11.3

mg/kg

1.4E-06

(mg/kg/day)

NA

(mg/kg/day)"



4.8E-05

(mg/kg/day)

4.0E-04

(mg/kg/day)

0.12









Arsenic

5.28

mg/kg

3.9E-07

(mg/kg/day)

1.5E+00

(mg/kg/day)"

5.8E-07

1.4E-05

(mg/kg/day)

3.0E-04

(mg/kg/day)

0.045









Cobalt

7.59

mg/kg

9.3E-07

(mg/kg/day)

NA

(mg/kg/day)"



3.2E-05

(mg/kg/day)

3.0E-04

(mg/kg/day)

0.11









Copper

1240

mg/kg

1.5E-04

(mg/kg/day)

NA

(mg/kg/day)"



5.3E-03

(mg/kg/day)

4.0E-02

(mg/kg/day)

0.13









Iron

20200

mg/kg

2.5E-03

(mg/kg/day)

NA

(mg/kg/day)"



8.6E-02

(mg/kg/day)

7.0E-01

(mg/kg/day)

0.12









Lead

131

mg/kg

1.6E-05

(mg/kg/day)

NA

(mg/kg/day)"



5.6E-04

(mg/kg/day)

NA

(mg/kg/day)











Manganese

456

mg/kg

5.6E-05

(mg/kg/day)

NA

(mg/kg/day)"



1.9E-03

(mg/kg/day)

2.4E-02

(mg/kg/day)

0.081









Vanadium

27

mg/kg

3.3E-06

(mg/kg/day)

NA

(mg/kg/day)"



1.2E-04

(mg/kg/day)

5.0E-03

(mg/kg/day)

0.023









Zinc

705

mg/kg

8.6E-05

(mg/kg/day)

NA

(mg/kg/day)"



3.0E-03

(mg/kg/day)

3.0E-01

(mg/kg/day)

0.010







Exp. Route Total





1.0E-06



0.71







Dermal

Benzo(a)pyrene

0.286

mg/kg

2.8E-08

(mg/kg/day)

1.0E+00

(mg/kg/day)"

2.8E-08

1.5E-07

(mg/kg/day)

3.0E-04

(mg/kg/day)

0.00050









Naphthalene

9.8

mg/kg

1.5E-07

(mg/kg/day)

NA

(mg/kg/day)"



5.2E-06

(mg/kg/day)

2.0E-02

(mg/kg/day)

0.00026









Dieldrin

0.11

mg/kg

1.3E-09

(mg/kg/day)

1.6E+01

(mg/kg/day)"

2.0E-08

4.5E-08

(mg/kg/day)

5.0E-05

(mg/kg/day)

0.00089









Aluminum

12000

mg/kg

1.4E-05

(mg/kg/day)

NA

(mg/kg/day)"



4.9E-04

(mg/kg/day)

1.0E+00

(mg/kg/day)

0.00049









Antimony

11.3

mg/kg

1.3E-08

(mg/kg/day)

NA

(mg/kg/day)"



4.6E-07

(mg/kg/day)

6.0E-05

(mg/kg/day)

0.0076









Arsenic

5.28

mg/kg

1.8E-08

(mg/kg/day)

1.5E+00

(mg/kg/day)"

2.8E-08

6.4E-07

(mg/kg/day)

3.0E-04

(mg/kg/day)

0.0021









Cobalt

7.59

mg/kg

8.8E-09

(mg/kg/day)

NA

(mg/kg/day)"



3.1E-07

(mg/kg/day)

3.0E-04

(mg/kg/day)

0.0010









Copper

1240

mg/kg

1.4E-06

(mg/kg/day)

NA

(mg/kg/day)"



5.0E-05

(mg/kg/day)

4.0E-02

(mg/kg/day)

0.0013









Iron

20200

mg/kg

2.3E-05

(mg/kg/day)

NA

(mg/kg/day)"



8.2E-04

(mg/kg/day)

7.0E-01

(mg/kg/day)

0.0012









Lead

131

mg/kg

0.0E+00

(mg/kg/day)

NA

(mg/kg/day)"



0.0E+00

(mg/kg/day)

NA

(mg/kg/day)











Manganese

456

mg/kg

5.3E-07

(mg/kg/day)

NA

(mg/kg/day)"



1.8E-05

(mg/kg/day)

9.6E-04

(mg/kg/day)

0.019









Vanadium

27

mg/kg

3.1E-08

(mg/kg/day)

NA

(mg/kg/day)"



1.1E-06

(mg/kg/day)

1.3E-04

(mg/kg/day)

0.0084









Zinc

705

mg/kg

8.2E-07

(mg/kg/day)

NA

(mg/kg/day)"



2.9E-05

(mg/kg/day)

3.0E-01

(mg/kg/day)

0.000095







Exp. Route Total





7.6E-08



0.043





Exposure Point Total



1.1E-06



0.75



Exposure Medium Total



1.1E-06



0.75



Air

OWR

Inhalation

Benzo(a)pyrene

8.8E-11

mg/m3

1.1E-11

(mg/m3)

6.0E-04

(ug/m3)"1

6.3E-12

5.7E-11

(mg/m3)

2.0E-06

(mg/m3)

0.000028









Naphthalene

1.7E-04

mg/m3

3.0E-06

(mg/m3)

3.4E-05

(ug/m3)"1

1.0E-07

1.1E-04

(mg/m3)

3.0E-03

(mg/m3)

0.035









Dieldrin

3.4E-11

mg/m3

6.2E-13

(mg/m3)

4.6E-03

(ug/m3)"1

2.9E-12

2.2E-11

(mg/m3)

NA

(mg/m3)











Aluminum

3.7E-06

mg/m

6.8E-08

(mg/m3)

NA

(ug/m3)"1



2.4E-06

(mg/m3)

5.0E-03

(mg/m3)

0.00047









Antimony

3.5E-09

mg/m3

6.4E-11

(mg/m3)

NA

(ug/m3)"1



2.2E-09

(mg/m3)

NA

(mg/m3)











Arsenic

1.6E-09

mg/m3

3.0E-11

(mg/m3)

4.3E-03

(ug/m3)"1

1.3E-10

1.0E-09

(mg/m3)

1.5E-05

(mg/m3)

0.000070









Cobalt

2.3E-09

mg/m3

4.3E-11

(mg/m3)

9.0E-03

(ug/m3)"1

3.9E-10

1.5E-09

(mg/m3)

6.0E-06

(mg/m3)

0.00025









Copper

3.8E-07

mg/m3

7.0E-09

(mg/m3)

NA

(ug/m3)"1



2.5E-07

(mg/m3)

NA

(mg/m3)











Iron

6.2E-06

mg/m3

1.1E-07

(mg/m3)

NA

(ug/m3)"1



4.0E-06

(mg/m3)

NA

(mg/m3)











Lead

4.0E-08

mg/m3

7.4E-10

(mg/m3)

NA

(ug/m3)"1



2.6E-08

(mg/m3)

NA

(mg/m3)











Manganese

1.4E-07

mg/m3

2.6E-09

(mg/m3)

NA

(ug/m3)"1



9.0E-08

(mg/m3)

5.0E-05

(mg/m3)

0.0018









Vanadium

8.3E-09

mg/m3

1.5E-10

(mg/m3)

NA

(ug/m3)"1



5.3E-09

(mg/m3)

1.0E-04

(mg/m3)

0.000053









Zinc

2.2E-07

mg/m3

4.0E-09

(mg/m3)

NA

(ug/m3)"1



1.4E-07

(mg/m3)

NA

(mg/m3)









Exp. Route Total





1.0E-07



0.038





Exposure Point Total



1.0E-07



0.038



Exposure Medium Total



1.0E-07



0.038

Medium Total



1.2E-06



0.79


-------
TABLE 7.2.CTE

CALCULATION OF CHEMICAL CANCER RISKS AND NON-CANCER HAZARDS
CENTRAL TENDENCY EXPOSURES
OLD WILMINGTON ROAD SITE
PAGE 2 OF 2

Scenario Timeframe: Current
Receptor Population: Residents

Receptor Age: Child	

Medium

Exposure Medium

Exposure Point

Exposure Route Chemical of

EPC

Cancer Risk Calculations

Non-Cancer Hazard Calculations







Potential Concern

Value

Units

Intake/Exposure Concentration

CSF/Unit Risk

Cancer Risk

Intake/Exposure Concentration

RfD/RfC

Hazard Quotient







|





Value

Units

Value

Units



Value

Units

Value

Units



Sediment

Sediment

OWR

Ingestion Cobalt

14

mg/kg

1.9E-07

(mg/kg/day)

NA

(mg/kg/day)"1



6.6E-06

(mg/kg/day)

3.0E-04

(mg/kg/day)

0.022







[Nickel

1500

mg/kg

2.0E-05

(mg/kg/day)

NA

(mg/kg/day)"1



7.1E-04

(mg/kg/day)

2.0E-02

(mg/kg/day)

0.036





I Exp. Route Total |







0.058







Dermal jCobalt

14

mg/kg

1.8E-09

(mg/kg/day)

NA

(mg/kg/day)"1



6.3E-08

(mg/kg/day)

3.0E-04

(mg/kg/day)

0.000







| Nickel

1500

mg/kg

1.9E-07

(mg/kg/day)

NA

(mg/kg/day)"1



6.8E-06

(mg/kg/day)

8.0E-04

(mg/kg/day)

0.0085







Exp. Route Total jj











0.009





Exposure Point Total







0.07



Exposure Medium Total









0.07

Medium Total







0.07

Total of Receptor Risks Across All Media

1.2E-06

Total of Receptor Hazards Across All Media

0.86

Notes:

1 - Mutagenic chemicals were evaluated in accordance with USEPA's Supplemental Guidance for Assessing Susceptibility from Early-Life Exposure to Carcinogens (2005).


-------
TABLE 7.3.CTE

CALCULATION OF CHEMICAL CANCER RISKS AND NON-CANCER HAZARDS
CENTRAL TENDENCY EXPOSURES
OLD WILMINGTON ROAD SITE
PAGE 1 OF 2

Scenario Timeframe: Current
Receptor Population: Residents

Receptor Age: Adult	

Medium

Exposure Medium

Exposure Point

Exposure Route

Chemical of

EPC

Cancer Risk Calculations

Non-Cancer Hazard Calculations









Potential Concern

Value

Units

Intake/Exposure Concentration

CSF/Unit Risk

Cancer Risk

Intake/Exposure Concentration

RfD/RfC

Hazard Quotient















Value

Units

Value

Units



Value

Units

Value

Units



Surface Soil

Surface Soil

OWR

Ingestion

Benzo(a)pyrene

0.286

mg/kg

1.8E-08

(mg/kg/day)

1.0E+00

(mg/kg/day)"

1.8E-08

1.1E-07

(mg/kg/day)

3.0E-04

(mg/kg/day)

0.00038









Naphthalene

9.8

mg/kg

3.9E-07

(mg/kg/day)

NA

(mg/kg/day)"



3.9E-06

(mg/kg/day)

2.0E-02

(mg/kg/day)

0.00020









Dieldrin

0.11

mg/kg

4.4E-09

(mg/kg/day)

1.6E+01

(mg/kg/day)"

7.1E-08

4.4E-08

(mg/kg/day)

5.0E-05

(mg/kg/day)

0.00088









Aluminum

12000

mg/kg

4.8E-04

(mg/kg/day)

NA

(mg/kg/day)"



4.8E-03

(mg/kg/day)

1.0E+00

(mg/kg/day)

0.0048









Antimony

11.3

mg/kg

4.5E-07

(mg/kg/day)

NA

(mg/kg/day)"



4.5E-06

(mg/kg/day)

4.0E-04

(mg/kg/day)

0.011









Arsenic

5.28

mg/kg

1.3E-07

(mg/kg/day)

1.5E+00

(mg/kg/day)"

1.9E-07

1.3E-06

(mg/kg/day)

3.0E-04

(mg/kg/day)

0.0042









Cobalt

7.59

mg/kg

3.0E-07

(mg/kg/day)

NA

(mg/kg/day)"



3.0E-06

(mg/kg/day)

3.0E-04

(mg/kg/day)

0.010









Copper

1240

mg/kg

5.0E-05

(mg/kg/day)

NA

(mg/kg/day)"



5.0E-04

(mg/kg/day)

4.0E-02

(mg/kg/day)

0.012









Iron

20200

mg/kg

8.1E-04

(mg/kg/day)

NA

(mg/kg/day)"



8.1E-03

(mg/kg/day)

7.0E-01

(mg/kg/day)

0.012









Lead

131

mg/kg

5.2E-06

(mg/kg/day)

NA

(mg/kg/day)"



5.2E-05

(mg/kg/day)

NA

(mg/kg/day)











Manganese

456

mg/kg

1.8E-05

(mg/kg/day)

NA

(mg/kg/day)"



1.8E-04

(mg/kg/day)

2.4E-02

(mg/kg/day)

0.0076









Vanadium

27

mg/kg

1.1E-06

(mg/kg/day)

NA

(mg/kg/day)"



1.1E-05

(mg/kg/day)

5.0E-03

(mg/kg/day)

0.0022









Zinc

705

mg/kg

2.8E-05

(mg/kg/day)

NA

(mg/kg/day)"



2.8E-04

(mg/kg/day)

3.0E-01

(mg/kg/day)

0.00094







Exp. Route Total





2.8E-07



0.067







Dermal

Benzo(a)pyrene

0.286

mg/kg

2.8E-09

(mg/kg/day)

1.0E+00

(mg/kg/day)"

2.8E-09

1.8E-08

(mg/kg/day)

3.0E-04

(mg/kg/day)

0.000060









Naphthalene

9.8

mg/kg

6.2E-08

(mg/kg/day)

NA

(mg/kg/day)"



6.2E-07

(mg/kg/day)

2.0E-02

(mg/kg/day)

0.000031









Dieldrin

0.11

mg/kg

5.3E-10

(mg/kg/day)

1.6E+01

(mg/kg/day)"

8.5E-09

5.3E-09

(mg/kg/day)

5.0E-05

(mg/kg/day)

0.00011









Aluminum

12000

mg/kg

5.8E-06

(mg/kg/day)

NA

(mg/kg/day)"



5.8E-05

(mg/kg/day)

1.0E+00

(mg/kg/day)

0.000058









Antimony

11.3

mg/kg

5.5E-09

(mg/kg/day)

NA

(mg/kg/day)"



5.5E-08

(mg/kg/day)

6.0E-05

(mg/kg/day)

0.00091









Arsenic

5.28

mg/kg

7.7E-09

(mg/kg/day)

1.5E+00

(mg/kg/day)"

1.1E-08

7.7E-08

(mg/kg/day)

3.0E-04

(mg/kg/day)

0.00026









Cobalt

7.59

mg/kg

3.7E-09

(mg/kg/day)

NA

(mg/kg/day)"



3.7E-08

(mg/kg/day)

3.0E-04

(mg/kg/day)

0.00012









Copper

1240

mg/kg

6.0E-07

(mg/kg/day)

NA

(mg/kg/day)"



6.0E-06

(mg/kg/day)

4.0E-02

(mg/kg/day)

0.00015









Iron

20200

mg/kg

9.8E-06

(mg/kg/day)

NA

(mg/kg/day)"



9.8E-05

(mg/kg/day)

7.0E-01

(mg/kg/day)

0.00014









Lead

131

mg/kg

0.0E+00

(mg/kg/day)

NA

(mg/kg/day)"



0.0E+00

(mg/kg/day)

NA

(mg/kg/day)











Manganese

456

mg/kg

2.2E-07

(mg/kg/day)

NA

(mg/kg/day)"



2.2E-06

(mg/kg/day)

9.6E-04

(mg/kg/day)

0.0023









Vanadium

27

mg/kg

1.3E-08

(mg/kg/day)

NA

(mg/kg/day)"



1.3E-07

(mg/kg/day)

1.3E-04

(mg/kg/day)

0.0010









Zinc

705

mg/kg

3.4E-07

(mg/kg/day)

NA

(mg/kg/day)"



3.4E-06

(mg/kg/day)

3.0E-01

(mg/kg/day)

0.000011







Exp. Route Total





2.3E-08



0.0051





Exposure Point Total



3.0E-07



0.072



Exposure Medium Total



3.0E-07



0.072



Air

OWR

Inhalation

Benzo(a)pyrene

8.8E-11

mg/m3

8.9E-12

(mg/m3)

6.0E-04

(ug/m3)"1

5.3E-12

5.7E-11

(mg/m3)

2.0E-06

(mg/m3)

0.000028









Naphthalene

1.7E-04

mg/m3

1.1E-05

(mg/m3)

3.4E-05

(ug/m3)"1

3.6E-07

1.1E-04

(mg/m3)

3.0E-03

(mg/m3)

0.035









Dieldrin

3.4E-11

mg/m3

2.2E-12

(mg/m3)

4.6E-03

(ug/m3)"1

1.0E-11

2.2E-11

(mg/m3)

NA

(mg/m3)











Aluminum

3.7E-06

mg/m

2.4E-07

(mg/m3)

NA

(ug/m3)"1



2.4E-06

(mg/m3)

5.0E-03

(mg/m3)

0.00047









Antimony

3.5E-09

mg/m3

2.2E-10

(mg/m3)

NA

(ug/m3)"1



2.2E-09

(mg/m3)

NA

(mg/m3)











Arsenic

1.6E-09

mg/m3

1.0E-10

(mg/m3)

4.3E-03

(ug/m3)"1

4.5E-10

1.0E-09

(mg/m3)

1.5E-05

(mg/m3)

0.000070









Cobalt

2.3E-09

mg/m3

1.5E-10

(mg/m3)

9.0E-03

(ug/m3)"1

1.4E-09

1.5E-09

(mg/m3)

6.0E-06

(mg/m3)

0.00025









Copper

3.8E-07

mg/m3

2.5E-08

(mg/m3)

NA

(ug/m3)"1



2.5E-07

(mg/m3)

NA

(mg/m3)











Iron

6.2E-06

mg/m3

4.0E-07

(mg/m3)

NA

(ug/m3)"1



4.0E-06

(mg/m3)

NA

(mg/m3)











Lead

4.0E-08

mg/m3

2.6E-09

(mg/m3)

NA

(ug/m3)"1



2.6E-08

(mg/m3)

NA

(mg/m3)











Manganese

1.4E-07

mg/m3

9.0E-09

(mg/m3)

NA

(ug/m3)"1



9.0E-08

(mg/m3)

5.0E-05

(mg/m3)

0.0018









Vanadium

8.3E-09

mg/m3

5.3E-10

(mg/m3)

NA

(ug/m3)"1



5.3E-09

(mg/m3)

1.0E-04

(mg/m3)

0.000053









Zinc

2.2E-07

mg/m3

1.4E-08

(mg/m3)

NA

(ug/m3)"1



1.4E-07

(mg/m3)

NA

(mg/m3)









Exp. Route Total





3.6E-07



0.038





Exposure Point Total



3.6E-07



0.038



Exposure Medium Total



3.6E-07



0.038

Medium Total



6.6E-07



0.11


-------
TABLE 7.3.CTE

CALCULATION OF CHEMICAL CANCER RISKS AND NON-CANCER HAZARDS
CENTRAL TENDENCY EXPOSURES
OLD WILMINGTON ROAD SITE
PAGE 2 OF 2

Scenario Timeframe: Current
Receptor Population: Residents

Receptor Age: Adult	

Medium

Exposure Medium

Exposure Point

Exposure Route Chemical of

EPC

Cancer Risk Calculations

Non-Cancer Hazard Calculations







Potential Concern

Value

Units

Intake/Exposure Concentration

CSF/Unit Risk

Cancer Risk

Intake/Exposure Concentration

RfD/RfC

Hazard Quotient







|





Value

Units

Value

Units



Value

Units

Value

Units



Sediment

Sediment

OWR

Ingestion Cobalt

14

mg/kg

6.2E-08

(mg/kg/day)

NA

(mg/kg/day)"1



6.2E-07

(mg/kg/day)

3.0E-04

(mg/kg/day)

0.0021







[Nickel

1500

mg/kg

6.7E-06

(mg/kg/day)

NA

(mg/kg/day)"1



6.7E-05

(mg/kg/day)

2.0E-02

(mg/kg/day)

0.0033





I Exp. Route Total |







0.0054







Dermal jCobalt

14

mg/kg

7.5E-10

(mg/kg/day)

NA

(mg/kg/day)"1



7.5E-09

(mg/kg/day)

3.0E-04

(mg/kg/day)

0.0000







| Nickel

1500

mg/kg

8.1E-08

(mg/kg/day)

NA

(mg/kg/day)"1



8.1E-07

(mg/kg/day)

8.0E-04

(mg/kg/day)

0.0010







Exp. Route Total jj











0.0010





Exposure Point Total







0.006



Exposure Medium Total









0.006

Medium Total







0.006

Total of Receptor Risks Across All Media

6.6E-07

Total of Receptor Hazards Across All Media

0.12

Notes:

1 - Mutagenic chemicals were evaluated in accordance with USEPA's Supplemental Guidance for Assessing Susceptibility from Early-Life Exposure to Carcinogens (2005).


-------
TABLE 7.4.CTE

CALCULATION OF CHEMICAL CANCER RISKS AND NON-CANCER HAZARDS
CENTRAL TENDENCY EXPOSURES
OLD WILMINGTON ROAD SITE
PAGE 1 OF 2

Scenario Timeframe: Current
Receptor Population: Residents

Receptor Age: Lifelong (Child and Adult)	

Medium

Exposure Medium

Exposure Point

Exposure Route

Chemical of

EPC

Cancer Risk Calculations

Non-Cancer Hazard Calculations









Potential Concern

Value

Units

Intake/Exposure Concentration

CSF/Unit Risk

Cancer Risk

Intake/Exposure Concentration

RfD/RfC

Hazard Quotient















Value

Units

Value

Units



Value

Units

Value

Units



Surface Soil

Surface Soil

OWR

Ingestion

Benzo(a)pyrene

0.286

mg/kg

2.5E-07

(mg/kg/day)

1.0E+00

(mg/kg/day)"

2.5E-07

See Tables 7.2.CTE and 7.3.CTE for Hazard Indices









Naphthalene

9.8

mg/kg

1.6E-06

(mg/kg/day)

NA

(mg/kg/day)"





















Dieldrin

0.11

mg/kg

1.8E-08

(mg/kg/day)

1.6E+01

(mg/kg/day)"

2.9E-07



















Aluminum

12000

mg/kg

1.9E-03

(mg/kg/day)

NA

(mg/kg/day)"





















Antimony

11.3

mg/kg

1.8E-06

(mg/kg/day)

NA

(mg/kg/day)"





















Arsenic

5.28

mg/kg

5.1E-07

(mg/kg/day)

1.5E+00

(mg/kg/day)"

7.7E-07



















Cobalt

7.59

mg/kg

1.2E-06

(mg/kg/day)

NA

(mg/kg/day)"





















Copper

1240

mg/kg

2.0E-04

(mg/kg/day)

NA

(mg/kg/day)"





















Iron

20200

mg/kg

3.3E-03

(mg/kg/day)

NA

(mg/kg/day)"





















Lead

131

mg/kg

2.1E-05

(mg/kg/day)

NA

(mg/kg/day)"





















Manganese

456

mg/kg

7.4E-05

(mg/kg/day)

NA

(mg/kg/day)"





















Vanadium

27

mg/kg

4.4E-06

(mg/kg/day)

NA

(mg/kg/day)"





















Zinc

705

mg/kg

1.1E-04

(mg/kg/day)

NA

(mg/kg/day)"



















Exp. Route Total





1.3E-06











Dermal

Benzo(a)pyrene

0.286

mg/kg

3.1E-08

(mg/kg/day)

1.0E+00

(mg/kg/day)"

3.1E-08



















Naphthalene

9.8

mg/kg

2.1E-07

(mg/kg/day)

NA

(mg/kg/day)"





















Dieldrin

0.11

mg/kg

1.8E-09

(mg/kg/day)

1.6E+01

(mg/kg/day)"

2.9E-08



















Aluminum

12000

mg/kg

2.0E-05

(mg/kg/day)

NA

(mg/kg/day)"





















Antimony

11.3

mg/kg

1.9E-08

(mg/kg/day)

NA

(mg/kg/day)"





















Arsenic

5.28

mg/kg

2.6E-08

(mg/kg/day)

1.5E+00

(mg/kg/day)"

3.9E-08



















Cobalt

7.59

mg/kg

1.2E-08

(mg/kg/day)

NA

(mg/kg/day)"





















Copper

1240

mg/kg

2.0E-06

(mg/kg/day)

NA

(mg/kg/day)"





















Iron

20200

mg/kg

3.3E-05

(mg/kg/day)

NA

(mg/kg/day)"





















Lead

131

mg/kg

0.0E+00

(mg/kg/day)

NA

(mg/kg/day)"





















Manganese

456

mg/kg

7.5E-07

(mg/kg/day)

NA

(mg/kg/day)"





















Vanadium

27

mg/kg

4.4E-08

(mg/kg/day)

NA

(mg/kg/day)"





















Zinc

705

mg/kg

1.2E-06

(mg/kg/day)

NA

(mg/kg/day)"



















Exp. Route Total





9.9E-08









Exposure Point Total



1.4E-06







Exposure Medium Total



1.4E-06







Air

OWR

Inhalation

Benzo(a)pyrene

8.8E-11

mg/m3

1.9E-11

(mg/m3)

6.0E-04

(ug/m3)"1

1.2E-11



















Naphthalene

1.7E-04

mg/m3

1.4E-05

(mg/m3)

3.4E-05

(ug/m3)"1

4.6E-07



















Dieldrin

3.4E-11

mg/m3

2.8E-12

(mg/m3)

4.6E-03

(ug/m3)"1

1.3E-11



















Aluminum

3.7E-06

mg/m3

3.1E-07

(mg/m3)

NA

(ug/m3)"1





















Antimony

3.5E-09

mg/m3

2.9E-10

(mg/m3)

NA

(ug/m3)"1





















Arsenic

1.6E-09

mg/m3

1.3E-10

(mg/m3)

4.3E-03

(ug/m3)"1

5.8E-10



















Cobalt

2.3E-09

mg/m3

1.9E-10

(mg/m3)

9.0E-03

(ug/m3)"1

1.7E-09



















Copper

3.8E-07

mg/m3

3.2E-08

(mg/m3)

NA

(ug/m3)"1





















Iron

6.2E-06

mg/m3

5.1E-07

(mg/m3)

NA

(ug/m3)"1





















Lead

4.0E-08

mg/m3

3.3E-09

(mg/m3)

NA

(ug/m3)"1





















Manganese

1.4E-07

mg/m3

1.2E-08

(mg/m3)

NA

(ug/m3)"1





















Vanadium

8.3E-09

mg/m3

6.9E-10

(mg/m3)

NA

(ug/m3)"1





















Zinc

2.2E-07

mg/m3

1.8E-08

(mg/m3)

NA

(ug/m3)"1



















Exp. Route Total





4.6E-07









Exposure Point Total



4.6E-07







Exposure Medium Total



4.6E-07





Medium Total



1.9E-06






-------
TABLE 7.4.CTE

CALCULATION OF CHEMICAL CANCER RISKS AND NON-CANCER HAZARDS
CENTRAL TENDENCY EXPOSURES
OLD WILMINGTON ROAD SITE
PAGE 2 OF 2

Scenario Timeframe: Current
Receptor Population: Residents

Receptor Age: Lifelong (Child and Adult)	

Medium

Exposure Medium

Exposure Point

Exposure Route Chemical of

EPC

Cancer Risk Calculations

Non-Cancer Hazard Calculations







Potential Concern

Value

Units

Intake/Exposure Concentration

CSF/Unit Risk

Cancer Risk

Intake/Exposure Concentration

RfD/RfC

Hazard Quotient







|





Value

Units

Value

Units



Value

Units

Value

Units



Sediment

Sediment

OWR

Ingestion Cobalt

14

mg/kg

2.5E-07

(mg/kg/day)

NA

(mg/kg/day)"1



















[Nickel

1500

mg/kg

2.7E-05

(mg/kg/day)

NA

(mg/kg/day)"1

















I Exp. Route Total |















Dermal jCobalt

14

mg/kg

2.6E-09

(mg/kg/day)

NA

(mg/kg/day)"1



















| Nickel

1500

mg/kg

2.7E-07

(mg/kg/day)

NA

(mg/kg/day)"1



















Exp. Route Total jj

















Exposure Point Total











Exposure Medium Total











Medium Total









Total of Receptor Risks Across All Media

1.9E-06





Notes:

1 - Mutagenic chemicals were evaluated in accordance with USEPA's Supplemental Guidance for Assessing Susceptibility from Early-Life Exposure to Carcinogens (2005).


-------
TABLE 7.5.CTE

CALCULATION OF CHEMICAL CANCER RISKS AND NON-CANCER HAZARDS
CENTRAL TENDENCY EXPOSURES
OLD WILMINGTON ROAD SITE
PAGE 1 OF 3

Scenario Timeframe: Future

Receptor Population: Construction Workers

Receptor Age: Adult	

Medium

Exposure Medium

Exposure Point

Exposure Route

Chemical of

EPC

Cancer Risk Calculations

Non-Cancer Hazard Calculations









Potential Concern

Value

Units

Intake/Exposure Concentration

CSF/Unit Risk

Cancer Risk

Intake/Exposure Concentration

RfD/RfC

Hazard Quotient















Value

Units

Value

Units



Value

Units

Value

Units



Surface/Subsurface Soil

Surface/Subsurface Soil

OWR

Ingestion

Benzo(a)pyrene

0.252

mg/kg

2.5E-09

(mg/kg/day)

1.0E+00

(mg/kg/day)"

2.5E-09

1.8E-07

(mg/kg/day)

3.0E-04

(mg/kg/day)

0.00059









Naphthalene

9.8

mg/kg

9.9E-08

(mg/kg/day)

NA

(mg/kg/day)"



6.9E-06

(mg/kg/day)

6.0E-01

(mg/kg/day)

0.000012









Dieldrin

0.11

mg/kg

1.1E-09

(mg/kg/day)

1.6E+01

(mg/kg/day)"

1.8E-08

7.8E-08

(mg/kg/day)

1.0E-04

(mg/kg/day)

0.00078









Aluminum

9940

mg/kg

1.0E-04

(mg/kg/day)

NA

(mg/kg/day)"



7.0E-03

(mg/kg/day)

1.0E+00

(mg/kg/day)

0.0070









Antimony

6.48

mg/kg

6.5E-08

(mg/kg/day)

NA

(mg/kg/day)"



4.6E-06

(mg/kg/day)

4.0E-04

(mg/kg/day)

0.011









Arsenic

3.95

mg/kg

2.4E-08

(mg/kg/day)

1.5E+00

(mg/kg/day)"

3.6E-08

1.7E-06

(mg/kg/day)

3.0E-04

(mg/kg/day)

0.0056









Cobalt

6.32

mg/kg

6.4E-08

(mg/kg/day)

NA

(mg/kg/day)"



4.5E-06

(mg/kg/day)

3.0E-03

(mg/kg/day)

0.0015









Copper

660

mg/kg

6.7E-06

(mg/kg/day)

NA

(mg/kg/day)"



4.7E-04

(mg/kg/day)

4.0E-02

(mg/kg/day)

0.012









Iron

19200

mg/kg

1.9E-04

(mg/kg/day)

NA

(mg/kg/day)"



1.4E-02

(mg/kg/day)

7.0E-01

(mg/kg/day)

0.019









Lead

71.4

mg/kg

7.2E-07

(mg/kg/day)

NA

(mg/kg/day)"



5.0E-05

(mg/kg/day)

NA

(mg/kg/day)











Manganese

388

mg/kg

3.9E-06

(mg/kg/day)

NA

(mg/kg/day)"



2.7E-04

(mg/kg/day)

2.4E-02

(mg/kg/day)

0.011









Thallium

2.13

mg/kg

2.1E-08

(mg/kg/day)

NA

(mg/kg/day)"



1.5E-06

(mg/kg/day)

4.0E-05

(mg/kg/day)

0.038









Vanadium

23.6

mg/kg

2.4E-07

(mg/kg/day)

NA

(mg/kg/day)"



1.7E-05

(mg/kg/day)

1.0E-02

(mg/kg/day)

0.0017









Zinc

380

mg/kg

3.8E-06

(mg/kg/day)

NA

(mg/kg/day)"



2.7E-04

(mg/kg/day)

3.0E-01

(mg/kg/day)

0.00089







Exp. Route Total





5.6E-08



0.11







Dermal

Benzo(a)pyrene

0.252

mg/kg

7.1E-10

(mg/kg/day)

1.0E+00

(mg/kg/day)"

7.1E-10

4.9E-08

(mg/kg/day)

3.0E-04

(mg/kg/day)

0.00016









Naphthalene

9.8

mg/kg

2.7E-08

(mg/kg/day)

NA

(mg/kg/day)"



1.9E-06

(mg/kg/day)

6.0E-01

(mg/kg/day)

0.0000032









Dieldrin

0.11

mg/kg

2.4E-10

(mg/kg/day)

1.6E+01

(mg/kg/day)"

3.8E-09

1.7E-08

(mg/kg/day)

1.0E-04

(mg/kg/day)

0.00017









Aluminum

9940

mg/kg

2.1E-06

(mg/kg/day)

NA

(mg/kg/day)"



1.5E-04

(mg/kg/day)

1.0E+00

(mg/kg/day)

0.00015









Antimony

6.48

mg/kg

1.4E-09

(mg/kg/day)

NA

(mg/kg/day)"



9.8E-08

(mg/kg/day)

6.0E-05

(mg/kg/day)

0.0016









Arsenic

3.95

mg/kg

2.6E-09

(mg/kg/day)

1.5E+00

(mg/kg/day)"

3.8E-09

1.8E-07

(mg/kg/day)

3.0E-04

(mg/kg/day)

0.00060









Cobalt

6.32

mg/kg

1.4E-09

(mg/kg/day)

NA

(mg/kg/day)"



9.5E-08

(mg/kg/day)

3.0E-03

(mg/kg/day)

0.000032









Copper

660

mg/kg

1.4E-07

(mg/kg/day)

NA

(mg/kg/day)"



1.0E-05

(mg/kg/day)

4.0E-02

(mg/kg/day)

0.00025









Iron

19200

mg/kg

4.1E-06

(mg/kg/day)

NA

(mg/kg/day)"



2.9E-04

(mg/kg/day)

7.0E-01

(mg/kg/day)

0.00041









Lead

71.4

mg/kg

0.0E+00

(mg/kg/day)

NA

(mg/kg/day)"



0.0E+00

(mg/kg/day)

NA

(mg/kg/day)











Manganese

388

mg/kg

8.4E-08

(mg/kg/day)

NA

(mg/kg/day)"



5.9E-06

(mg/kg/day)

9.6E-04

(mg/kg/day)

0.0061









Thallium

2.13

mg/kg

4.6E-10

(mg/kg/day)

NA

(mg/kg/day)"



3.2E-08

(mg/kg/day)

4.0E-05

(mg/kg/day)

0.00080









Vanadium

23.6

mg/kg

5.1E-09

(mg/kg/day)

NA

(mg/kg/day)"



3.6E-07

(mg/kg/day)

2.6E-04

(mg/kg/day)

0.0014









Zinc

380

mg/kg

8.2E-08

(mg/kg/day)

NA

(mg/kg/day)"



5.7E-06

(mg/kg/day)

3.0E-01

(mg/kg/day)

0.000019







Exp. Route Total





8.3E-09



0.012





Exposure Point Total



6.5E-08



0.12



Exposure Medium Total



6.5E-08



0.12



Air

OWR

Inhalation

Benzo(a)pyrene

1.8E-07

mg/m3

2.9E-10

(mg/m3)

6.0E-04

(ug/m3)"1

1.8E-10

2.1E-08

(mg/m3)

2.0E-06

(mg/m3)

0.010









Naphthalene

9.6E-04

mg/m3

1.6E-06

(mg/m3)

3.4E-05

(ug/m3)"1

5.3E-08

1.1E-04

(mg/m3)

3.0E-03

(mg/m3)

0.036









Dieldrin

7.9E-08

mg/m3

1.3E-10

(mg/m3)

4.6E-03

(ug/m3)"1

5.9E-10

9.0E-09

(mg/m3)

NA

(mg/m3)











Aluminum

7.1E-03

mg/m3

1.2E-05

(mg/m3)

NA

(ug/m3)"1



8.1E-04

(mg/m3)

5.0E-03

(mg/m3)

0.16









Antimony

4.6E-06

mg/m3

7.5E-09

(mg/m3)

NA

(ug/m3)"1



5.3E-07

(mg/m3)

NA

(mg/m3)











Arsenic

2.8E-06

mg/m3

4.6E-09

(mg/m3)

4.3E-03

(ug/m3)"1

2.0E-08

3.2E-07

(mg/m3)

1.5E-05

(mg/m3)

0.021









Cobalt

4.5E-06

mg/m3

7.4E-09

(mg/m3)

9.0E-03

(ug/m3)"1

6.6E-08

5.2E-07

(mg/m3)

2.0E-05

(mg/m3)

0.026









Copper

4.7E-04

mg/m3

7.7E-07

(mg/m3)

NA

(ug/m3)"1



5.4E-05

(mg/m3)

NA

(mg/m3)











Iron

1.4E-02

mg/m3

2.2E-05

(mg/m3)

NA

(ug/m3)"1



1.6E-03

(mg/m3)

NA

(mg/m3)











Lead

5.1E-05

mg/m3

8.3E-08

(mg/m3)

NA

(ug/m3)"1



5.8E-06

(mg/m3)

NA

(mg/m3)











Manganese

2.8E-04

mg/m3

4.5E-07

(mg/m3)

NA

(ug/m3)"1



3.2E-05

(mg/m3)

5.0E-05

(mg/m3)

0.63









Thallium

1.5E-06

mg/m3

2.5E-09

(mg/m3)

NA

(ug/m3)"1



1.7E-07

(mg/m3)

NA

(mg/m3)











Vanadium

1.7E-05

mg/m

2.7E-08

(mg/m3)

NA

(ug/m3)"1



1.9E-06

(mg/m3)

1.0E-04

(mg/m3)

0.019









Zinc

2.7E-04

mg/m3

4.4E-07

(mg/m3)

NA

(ug/m3)"1



3.1E-05

(mg/m3)

NA

(mg/m3)









Exp. Route Total





1.4E-07



0.91





Exposure Point Total



1.4E-07



0.91



Exposure Medium Total



1.4E-07



0.91

Medium Total



2.0E-07



1.0


-------
TABLE 7.5.CTE

CALCULATION OF CHEMICAL CANCER RISKS AND NON-CANCER HAZARDS
CENTRAL TENDENCY EXPOSURES
OLD WILMINGTON ROAD SITE
PAGE 2 OF 3

Scenario Timeframe: Future

Receptor Population: Construction Workers

Receptor Age: Adult	

Medium

Exposure Medium

Exposure Point

Exposure Route

Chemical of

EPC

Cancer Risk Calculations

Non-Cancer Hazard Calculations









Potential Concern

Value

Units

Intake/Exposure Concentration

CSF/Unit Risk

Cancer Risk

Intake/Exposure Concentration

RfD/RfC

Hazard Quotient















Value

Units

Value

Units



Value

Units

Value

Units



Groundwater

Groundwater

OWR

Ingestion

2-Butanone

2

ug/L

1.5E-09

(mg/kg/day)

NA

(mg/kg/day)"



1.0E-07

(mg/kg/day)

2.0E+00

(mg/kg/day)

5.1 E-8









cis-1,2-Dichloroethene

3.1

ug/L

2.3E-09

(mg/kg/day)

NA

(mg/kg/day)"



1.6E-07

(mg/kg/day)

2.0E-02

(mg/kg/day)

0.0000080









Methyl tert-butyl ether

0.95

ug/L

7.0E-10

(mg/kg/day)

1.8E-03

(mg/kg/day)"

1.3E-12

4.9E-08

(mg/kg/day)

NA

(mg/kg/day)











Trichloroethene

27

ug/L

2.0E-08

(mg/kg/day)

4.6E-02

(mg/kg/day)"

9.1E-10

1.4E-06

(mg/kg/day)

5.0E-04

(mg/kg/day)

0.0028









1,4-Dioxane

3.8

ug/L

2.8E-09

(mg/kg/day)

1.0E-01

(mg/kg/day)"

2.8E-10

2.0E-07

(mg/kg/day)

5.0E-01

(mg/kg/day)

0.00000039









Caprolactam

3.7

ug/L

2.7E-09

(mg/kg/day)

NA

(mg/kg/day)"



1.9E-07

(mg/kg/day)

5.0E-01

(mg/kg/day)

0.00000038









Aluminum

114000

ug/L

8.4E-05

(mg/kg/day)

NA

(mg/kg/day)"



5.9E-03

(mg/kg/day)

1.0E+00

(mg/kg/day)

0.0059









Antimony

0.46

ug/L

3.4E-10

(mg/kg/day)

NA

(mg/kg/day)"



2.4E-08

(mg/kg/day)

4.0E-04

(mg/kg/day)

0.000059









Arsenic

60.1

ug/L

4.4E-08

(mg/kg/day)

1.5E+00

(mg/kg/day)"

6.6E-08

3.1E-06

(mg/kg/day)

3.0E-04

(mg/kg/day)

0.010









Barium

3310

ug/L

2.4E-06

(mg/kg/day)

NA

(mg/kg/day)"



1.7E-04

(mg/kg/day)

2.0E-01

(mg/kg/day)

0.00085









Beryllium

17.8

ug/L

1.3E-08

(mg/kg/day)

NA

(mg/kg/day)"



9.1E-07

(mg/kg/day)

5.0E-03

(mg/kg/day)

0.00018









Cadmium

0.45

ug/L

3.3E-10

(mg/kg/day)

NA

(mg/kg/day)"



2.3E-08

(mg/kg/day)

5.0E-04

(mg/kg/day)

0.000046









Cobalt

12.2

ug/L

9.0E-09

(mg/kg/day)

NA

(mg/kg/day)"



6.3E-07

(mg/kg/day)

3.0E-03

(mg/kg/day)

0.00021









Copper

39.9

ug/L

2.9E-08

(mg/kg/day)

NA

(mg/kg/day)"



2.0E-06

(mg/kg/day)

4.0E-02

(mg/kg/day)

0.000051









Iron

74900

ug/L

5.5E-05

(mg/kg/day)

NA

(mg/kg/day)"



3.8E-03

(mg/kg/day)

7.0E-01

(mg/kg/day)

0.0055









Lead

206

ug/L

1.5E-07

(mg/kg/day)

NA

(mg/kg/day)"



1.1E-05

(mg/kg/day)

NA

(mg/kg/day)











Manganese

1020

ug/L

7.5E-07

(mg/kg/day)

NA

(mg/kg/day)"



5.2E-05

(mg/kg/day)

2.4E-02

(mg/kg/day)

0.0022









Mercury

0.091

ug/L

6.7E-11

(mg/kg/day)

NA

(mg/kg/day)"



4.7E-09

(mg/kg/day)

2.0E-03

(mg/kg/day)

0.0000023









Nickel

15.8

ug/L

1.2E-08

(mg/kg/day)

NA

(mg/kg/day)"



8.1E-07

(mg/kg/day)

2.0E-02

(mg/kg/day)

0.000041









Selenium

1.6

ug/L

1.2E-09

(mg/kg/day)

NA

(mg/kg/day)"



8.2E-08

(mg/kg/day)

5.0E-03

(mg/kg/day)

0.000016









Thallium

2.3

ug/L

1.7E-09

(mg/kg/day)

NA

(mg/kg/day)"



1.2E-07

(mg/kg/day)

4.0E-05

(mg/kg/day)

0.0030









Vanadium

30.5

ug/L

2.2E-08

(mg/kg/day)

NA

(mg/kg/day)"



1.6E-06

(mg/kg/day)

1.0E-02

(mg/kg/day)

0.00016









Zinc

343

ug/L

2.5E-07

(mg/kg/day)

NA

(mg/kg/day)"



1.8E-05

(mg/kg/day)

3.0E-01

(mg/kg/day)

0.000059







Exp. Route Total





6.7E-08



0.031







Dermal

2-Butanone

2

ug/L

4.5E-10

(mg/kg/day)

NA

(mg/kg/day)"



3.2E-08

(mg/kg/day)

2.0E+00

(mg/kg/day)

1.6E-8









cis-1,2-Dichloroethene

3.1

ug/L

8.1E-09

(mg/kg/day)

NA

(mg/kg/day)"



5.7E-07

(mg/kg/day)

2.0E-02

(mg/kg/day)

0.000028









Methyl tert-butyl ether

0.95

ug/L

4.8E-10

(mg/kg/day)

1.8E-03

(mg/kg/day)"

8.6E-13

3.4E-08

(mg/kg/day)

NA

(mg/kg/day)











Trichloroethene

27

ug/L

8.1E-08

(mg/kg/day)

4.6E-02

(mg/kg/day)"

3.7E-09

5.7E-06

(mg/kg/day)

5.0E-04

(mg/kg/day)

0.011









1,4-Dioxane

3.8

ug/L

3.0E-10

(mg/kg/day)

1.0E-01

(mg/kg/day)"

3.0E-11

2.1E-08

(mg/kg/day)

5.0E-01

(mg/kg/day)

4.3E-8









Caprolactam

3.7

ug/L

9.4E-10

(mg/kg/day)

NA

(mg/kg/day)"



6.6E-08

(mg/kg/day)

5.0E-01

(mg/kg/day)

0.00000013









Aluminum

114000

ug/L

2.4E-05

(mg/kg/day)

NA

(mg/kg/day)"



1.7E-03

(mg/kg/day)

1.0E+00

(mg/kg/day)

0.0017









Antimony

0.46

ug/L

9.5E-11

(mg/kg/day)

NA

(mg/kg/day)"



6.7E-09

(mg/kg/day)

6.0E-05

(mg/kg/day)

0.00011









Arsenic

60.1

ug/L

1.2E-08

(mg/kg/day)

1.5E+00

(mg/kg/day)"

1.9E-08

8.7E-07

(mg/kg/day)

3.0E-04

(mg/kg/day)

0.0029









Barium

3310

ug/L

6.9E-07

(mg/kg/day)

NA

(mg/kg/day)"



4.8E-05

(mg/kg/day)

1.4E-02

(mg/kg/day)

0.0034









Beryllium

17.8

ug/L

3.7E-09

(mg/kg/day)

NA

(mg/kg/day)"



2.6E-07

(mg/kg/day)

3.5E-05

(mg/kg/day)

0.0074









Cadmium

0.45

ug/L

9.3E-11

(mg/kg/day)

NA

(mg/kg/day)"



6.5E-09

(mg/kg/day)

2.5E-05

(mg/kg/day)

0.00026









Cobalt

12.2

ug/L

1.0E-09

(mg/kg/day)

NA

(mg/kg/day)"



7.1E-08

(mg/kg/day)

3.0E-03

(mg/kg/day)

0.000024









Copper

39.9

ug/L

8.3E-09

(mg/kg/day)

NA

(mg/kg/day)"



5.8E-07

(mg/kg/day)

4.0E-02

(mg/kg/day)

0.000014









Iron

74900

ug/L

1.6E-05

(mg/kg/day)

NA

(mg/kg/day)"



1.1E-03

(mg/kg/day)

7.0E-01

(mg/kg/day)

0.0016









Lead

206

ug/L

4.3E-09

(mg/kg/day)

NA

(mg/kg/day)"



3.0E-07

(mg/kg/day)

NA

(mg/kg/day)











Manganese

1020

ug/L

2.1E-07

(mg/kg/day)

NA

(mg/kg/day)"



1.5E-05

(mg/kg/day)

9.6E-04

(mg/kg/day)

0.015









Mercury

0.091

ug/L

1.9E-11

(mg/kg/day)

NA

(mg/kg/day)"



1.3E-09

(mg/kg/day)

1.4E-04

(mg/kg/day)

0.0000094









Nickel

15.8

ug/L

6.5E-10

(mg/kg/day)

NA

(mg/kg/day)"



4.6E-08

(mg/kg/day)

8.0E-04

(mg/kg/day)

0.000057









Selenium

1.6

ug/L

3.3E-10

(mg/kg/day)

NA

(mg/kg/day)"



2.3E-08

(mg/kg/day)

5.0E-03

(mg/kg/day)

0.0000046









Thallium

2.3

ug/L

4.8E-10

(mg/kg/day)

NA

(mg/kg/day)"



3.3E-08

(mg/kg/day)

4.0E-05

(mg/kg/day)

0.00083









Vanadium

30.5

ug/L

6.3E-09

(mg/kg/day)

NA

(mg/kg/day)"



4.4E-07

(mg/kg/day)

2.6E-04

(mg/kg/day)

0.0017









Zinc

343

ug/L

4.3E-08

(mg/kg/day)

NA

(mg/kg/day)"



3.0E-06

(mg/kg/day)

3.0E-01

(mg/kg/day)

0.0000099







Exp. Route Total





2.2E-08



0.047





Exposure Point Total



9.0E-08



0.08



Exposure Medium Total



9.0E-08



0.08


-------
TABLE 7.5.CTE

CALCULATION OF CHEMICAL CANCER RISKS AND NON-CANCER HAZARDS
CENTRAL TENDENCY EXPOSURES
OLD WILMINGTON ROAD SITE
PAGE 3 OF 3

Scenario Timeframe: Future

Receptor Population: Construction Workers

Receptor Age: Adult	

Medium

Exposure Medium

Exposure Point

Exposure Route

Chemical of
Potential Concern

EPC

Cancer Risk Calculations

Non-Cancer Hazard Calculations

Value

Units

Intake/Exposure Concentration

CSF/Unit Risk

Cancer Risk

Intake/Exposure Concentration

RfD/RfC

Hazard Quotient

Value

Units

Value

Units



Value

Units

Value

Units

Groundwater

Air

OWR

Inhalation

2-Butanone

9.4E-03

mg/m3

1.8E-06

(mg/m3)

NA

(ug/m3)"1



1.3E-04

(mg/m3)

1.0E+00

(mg/m3)

0.00013









cis-1,2-Dichloroethene

2.6E-02

mg/m3

5.1E-06

(mg/m3)

NA

(ug/m3)"1



3.6E-04

(mg/m3)

NA

(mg/m3)











Methyl tert-butyl ether

7.7E-03

mg/m3

1.5E-06

(mg/m3)

2.6E-07

(ug/m3)"1

3.9E-10

1.0E-04

(mg/m3)

3.0E+00

(mg/m3)

0.000035









Trichloroethene

2.0E-01

mg/m3

3.8E-05

(mg/m3)

4.1E-06

(ug/m3)"1

1.6E-07

2.7E-03

(mg/m3)

2.0E-03

(mg/m3)

1.3









1,4-Dioxane

2.5E-03

mg/m3

4.9E-07

(mg/m3)

5.0E-06

(ug/m3)"1

2.4E-09

3.4E-05

(mg/m3)

7.2E-01

(mg/m3)

0.000048









Caprolactam

0.0E+00

mg/m3

0.0E+00

(mg/m3)

NA

(ug/m3)"1



0.0E+00

(mg/m3)

2.2E-03

(mg/m3)











Aluminum

0.0E+00

mg/m3

0.0E+00

(mg/m3)

NA

(ug/m3)"1



0.0E+00

(mg/m3)

5.0E-03

(mg/m3)











Antimony

0.0E+00

mg/m3

0.0E+00

(mg/m3)

NA

(ug/m3)"1



0.0E+00

(mg/m3)

NA

(mg/m3)











Arsenic

0.0E+00

mg/m3

0.0E+00

(mg/m3)

4.3E-03

(ug/m3)"1



0.0E+00

(mg/m3)

1.5E-05

(mg/m3)











Barium

0.0E+00

mg/m3

0.0E+00

(mg/m3)

NA

(ug/m3)"1



0.0E+00

(mg/m3)

5.0E-03

(mg/m3)











Beryllium

0.0E+00

mg/m3

0.0E+00

(mg/m3)

2.4E-03

(ug/m3)"1



0.0E+00

(mg/m3)

2.0E-05

(mg/m3)











Cadmium

0.0E+00

mg/m3

0.0E+00

(mg/m3)

1.8E-03

(ug/m3)"1



0.0E+00

(mg/m3)

1.0E-05

(mg/m3)











Cobalt

0.0E+00

mg/m3

0.0E+00

(mg/m3)

9.0E-03

(ug/m3)"1



0.0E+00

(mg/m3)

2.0E-05

(mg/m3)











Copper

0.0E+00

mg/m3

0.0E+00

(mg/m3)

NA

(ug/m3)"1



0.0E+00

(mg/m3)

NA

(mg/m3)











Iron

0.0E+00

mg/m3

0.0E+00

(mg/m3)

NA

(ug/m3)"1



0.0E+00

(mg/m3)

NA

(mg/m3)











Lead

0.0E+00

mg/m3

0.0E+00

(mg/m3)

NA

(ug/m3)"1



0.0E+00

(mg/m3)

NA

(mg/m3)











Manganese

0.0E+00

mg/m3

0.0E+00

(mg/m3)

NA

(ug/m3)"1



0.0E+00

(mg/m3)

5.0E-05

(mg/m3)











Mercury

0.0E+00

mg/m3

0.0E+00

(mg/m3)

NA

(ug/m3)"1



0.0E+00

(mg/m3)

3.0E-04

(mg/m3)











Nickel

0.0E+00

mg/m3

0.0E+00

(mg/m3)

2.6E-04

(ug/m3)"1



0.0E+00

(mg/m3)

2.0E-04

(mg/m3)











Selenium

0.0E+00

mg/m3

0.0E+00

(mg/m3)

NA

(ug/m3)"1



0.0E+00

(mg/m3)

2.0E-02

(mg/m3)











Thallium

0.0E+00

mg/m3

0.0E+00

(mg/m3)

NA

(ug/m3)"1



0.0E+00

(mg/m3)

NA

(mg/m3)











Vanadium

0.0E+00

mg/m3

0.0E+00

(mg/m3)

NA

(ug/m3)"1



0.0E+00

(mg/m3)

1.0E-04

(mg/m3)











Zinc

0.0E+00

mg/m3

0.0E+00

(mg/m3)

NA

(ug/m3)"1



0.0E+00

(mg/m3)

NA

(mg/m3)









Exp. Route Total





1.6E-07



1.3

Exposure Point Total



1.6E-07



1.3

Exposure Medium Total



1.6E-07



1.3

Medium Total



2.5E-07



1.4

Total of Receptor Risks Across All Media

4.5E-07

Total of Receptor Hazards Across All Media

2.4

1 - Mutagenic chemicals were evaluated in accordance with USEPA's Supplemental Guidance for Assessing Susceptibility from Early-Life Exposure to Carcinogens (2005).


-------
TABLE 7.6.CTE

CALCULATION OF CHEMICAL CANCER RISKS AND NON-CANCER HAZARDS
CENTRAL TENDENCY EXPOSURES
OLD WILMINGTON ROAD SITE
PAGE 1 OF 3

Scenario Timeframe: Future

Receptor Population: Industrial Worker

Receptor Age: Adult	

Medium

Exposure Medium

Exposure Point

Exposure Route

Chemical of

EPC

Cancer Risk Calculations

Non-Cancer Hazard Calculations









Potential Concern

Value

Units

Intake/Exposure Concentration

CSF/Unit Risk

Cancer Risk

Intake/Exposure Concentration

RfD/RfC

Hazard Quotient















Value

Units

Value

Units



Value

Units

Value

Units



Surface/Subsurface Soil

Surface/Subsurface Soil

OWR

Ingestion

Benzo(a)pyrene

0.252

mg/kg

9.5E-09

(mg/kg/day)

1.0E+00

(mg/kg/day)"

9.5E-09

9.5E-08

(mg/kg/day)

3.0E-04

(mg/kg/day)

0.00032









Naphthalene

9.8

mg/kg

3.7E-07

(mg/kg/day)

NA

(mg/kg/day)"



3.7E-06

(mg/kg/day)

2.0E-02

(mg/kg/day)

0.00018









Dieldrin

0.11

mg/kg

4.1E-09

(mg/kg/day)

1.6E+01

(mg/kg/day)"

6.6E-08

4.1E-08

(mg/kg/day)

5.0E-05

(mg/kg/day)

0.00083









Aluminum

9940

mg/kg

3.7E-04

(mg/kg/day)

NA

(mg/kg/day)"



3.7E-03

(mg/kg/day)

1.0E+00

(mg/kg/day)

0.0037









Antimony

6.48

mg/kg

2.4E-07

(mg/kg/day)

NA

(mg/kg/day)"



2.4E-06

(mg/kg/day)

4.0E-04

(mg/kg/day)

0.006









Arsenic

3.95

mg/kg

8.9E-08

(mg/kg/day)

1.5E+00

(mg/kg/day)"

1.3E-07

8.9E-07

(mg/kg/day)

3.0E-04

(mg/kg/day)

0.0030









Cobalt

6.32

mg/kg

2.4E-07

(mg/kg/day)

NA

(mg/kg/day)"



2.4E-06

(mg/kg/day)

3.0E-04

(mg/kg/day)

0.0079









Copper

660

mg/kg

2.5E-05

(mg/kg/day)

NA

(mg/kg/day)"



2.5E-04

(mg/kg/day)

4.0E-02

(mg/kg/day)

0.006









Iron

19200

mg/kg

7.2E-04

(mg/kg/day)

NA

(mg/kg/day)"



7.2E-03

(mg/kg/day)

7.0E-01

(mg/kg/day)

0.010









Lead

71.4

mg/kg

2.7E-06

(mg/kg/day)

NA

(mg/kg/day)"



2.7E-05

(mg/kg/day)

NA

(mg/kg/day)











Manganese

388

mg/kg

1.5E-05

(mg/kg/day)

NA

(mg/kg/day)"



1.5E-04

(mg/kg/day)

2.4E-02

(mg/kg/day)

0.0061









Thallium

2.13

mg/kg

8.0E-08

(mg/kg/day)

NA

(mg/kg/day)"



8.0E-07

(mg/kg/day)

1.0E-05

(mg/kg/day)

0.0799









Vanadium

23.6

mg/kg

8.9E-07

(mg/kg/day)

NA

(mg/kg/day)"



8.9E-06

(mg/kg/day)

5.0E-03

(mg/kg/day)

0.0018









Zinc

380

mg/kg

1.4E-05

(mg/kg/day)

NA

(mg/kg/day)"



1.4E-04

(mg/kg/day)

3.0E-01

(mg/kg/day)

0.00048







Exp. Route Total





2.1E-07



0.13







Dermal

Benzo(a)pyrene

0.252

mg/kg

1.7E-09

(mg/kg/day)

1.0E+00

(mg/kg/day)"

1.7E-09

1.7E-08

(mg/kg/day)

3.0E-04

(mg/kg/day)

0.000058









Naphthalene

9.8

mg/kg

6.7E-08

(mg/kg/day)

NA

(mg/kg/day)"



6.7E-07

(mg/kg/day)

2.0E-02

(mg/kg/day)

0.000034









Dieldrin

0.11

mg/kg

5.8E-10

(mg/kg/day)

1.6E+01

(mg/kg/day)"

9.3E-09

5.8E-09

(mg/kg/day)

5.0E-05

(mg/kg/day)

0.00012









Aluminum

9940

mg/kg

5.3E-06

(mg/kg/day)

NA

(mg/kg/day)"



5.3E-05

(mg/kg/day)

1.0E+00

(mg/kg/day)

0.000053









Antimony

6.48

mg/kg

3.4E-09

(mg/kg/day)

NA

(mg/kg/day)"



3.4E-08

(mg/kg/day)

6.0E-05

(mg/kg/day)

0.00057









Arsenic

3.95

mg/kg

6.3E-09

(mg/kg/day)

1.5E+00

(mg/kg/day)"

9.4E-09

6.3E-08

(mg/kg/day)

3.0E-04

(mg/kg/day)

0.00021









Cobalt

6.32

mg/kg

3.3E-09

(mg/kg/day)

NA

(mg/kg/day)"



3.3E-08

(mg/kg/day)

3.0E-04

(mg/kg/day)

0.00011









Copper

660

mg/kg

3.5E-07

(mg/kg/day)

NA

(mg/kg/day)"



3.5E-06

(mg/kg/day)

4.0E-02

(mg/kg/day)

0.00009









Iron

19200

mg/kg

1.0E-05

(mg/kg/day)

NA

(mg/kg/day)"



1.0E-04

(mg/kg/day)

7.0E-01

(mg/kg/day)

0.00015









Lead

71.4

mg/kg

0.0E+00

(mg/kg/day)

NA

(mg/kg/day)"



0.0E+00

(mg/kg/day)

NA

(mg/kg/day)











Manganese

388

mg/kg

2.1E-07

(mg/kg/day)

NA

(mg/kg/day)"



2.1E-06

(mg/kg/day)

9.6E-04

(mg/kg/day)

0.0021









Thallium

2.13

mg/kg

1.1E-09

(mg/kg/day)

NA

(mg/kg/day)"



1.1E-08

(mg/kg/day)

1.0E-05

(mg/kg/day)

0.0011









Vanadium

23.6

mg/kg

1.2E-08

(mg/kg/day)

NA

(mg/kg/day)"



1.2E-07

(mg/kg/day)

1.3E-04

(mg/kg/day)

0.0010









Zinc

380

mg/kg

2.0E-07

(mg/kg/day)

NA

(mg/kg/day)"



2.0E-06

(mg/kg/day)

3.0E-01

(mg/kg/day)

0.000007







Exp. Route Total





2.0E-08



0.0056





Exposure Point Total



2.3E-07



0.13



Exposure Medium Total



2.3E-07



0.13



Air

OWR

Inhalation

Benzo(a)pyrene

7.8E-11

mg/m3

1.6E-12

(mg/m3)

6.0E-04

(ug/m3)"1

9.3E-13

1.6E-11

(mg/m3)

2.0E-06

(mg/m3)

0.0000078









Naphthalene

1.7E-04

mg/m3

3.3E-06

(mg/m3)

3.4E-05

(ug/m3)"1

1.1E-07

3.3E-05

(mg/m3)

3.0E-03

(mg/m3)

0.011









Dieldrin

3.4E-11

mg/m3

6.8E-13

(mg/m3)

4.6E-03

(ug/m3)"1

3.1E-12

6.8E-12

(mg/m3)

NA

(mg/m3)











Aluminum

3.1E-06

mg/m3

6.1E-08

(mg/m3)

NA

(ug/m3)"1



6.1E-07

(mg/m3)

5.0E-03

(mg/m3)

0.00012









Antimony

2.0E-09

mg/m3

4.0E-11

(mg/m3)

NA

(ug/m3)"1



4.0E-10

(mg/m3)

NA

(mg/m3)











Arsenic

1.2E-09

mg/m3

2.4E-11

(mg/m3)

4.3E-03

(ug/m3)"1

1.0E-10

2.4E-10

(mg/m3)

1.5E-05

(mg/m3)

0.000016









Cobalt

2.0E-09

mg/m3

3.9E-11

(mg/m3)

9.0E-03

(ug/m3)"1

3.5E-10

3.9E-10

(mg/m3)

6.0E-06

(mg/m3)

0.000065









Copper

2.0E-07

mg/m3

4.1E-09

(mg/m3)

NA

(ug/m3)"1



4.1E-08

(mg/m3)

NA

(mg/m3)











Iron

5.9E-06

mg/m3

1.2E-07

(mg/m3)

NA

(ug/m3)"1



1.2E-06

(mg/m3)

NA

(mg/m3)











Lead

2.2E-08

mg/m3

4.4E-10

(mg/m3)

NA

(ug/m3)"1



4.4E-09

(mg/m3)

NA

(mg/m3)











Manganese

1.2E-07

mg/m3

2.4E-09

(mg/m3)

NA

(ug/m3)"1



2.4E-08

(mg/m3)

5.0E-05

(mg/m3)

0.00048









Thallium

6.6E-10

mg/m3

1.3E-11

(mg/m3)

NA

(ug/m3)"1



1.3E-10

(mg/m3)

NA

(mg/m3)











Vanadium

7.3E-09

mg/m

1.5E-10

(mg/m3)

NA

(ug/m3)"1



1.5E-09

(mg/m3)

1.0E-04

(mg/m3)

0.000015









Zinc

1.2E-07

mg/m3

2.3E-09

(mg/m3)

NA

(ug/m3)"1



2.3E-08

(mg/m3)

NA

(mg/m3)









Exp. Route Total





1.1E-07



0.012





Exposure Point Total



1.1E-07



0.012



Exposure Medium Total



1.1E-07



0.012

Medium Total



3.4E-07



0.14


-------
TABLE 7.6.CTE

CALCULATION OF CHEMICAL CANCER RISKS AND NON-CANCER HAZARDS
CENTRAL TENDENCY EXPOSURES
OLD WILMINGTON ROAD SITE
PAGE 2 OF 3

Scenario Timeframe: Future

Receptor Population: Industrial Worker

Receptor Age: Adult	

Exposure Medium

Exposure Route

Chemical of

EPC

Cancer Risk Calculations

Non-Cancer Hazard Calculations



Potential Concern

Value

Units

Intake/Exposure Concentration

CSF/Unit Risk

Cancer Risk

Intake/Exposure Concentration

RfD/RfC

Hazard Quotient









Value

Units

Value

Units



Value

Units

Value

Units



Ingestion

2-Butanone

1300

ug/L

5.5E-04

(mg/kg/day)

NA

(mg/kg/day)"



5.9E-03

(mg/kg/day)

6.0E-01

(mg/kg/day)

0.0098



2-Hexanone

41

ug/L

1.7E-05

(mg/kg/day)

NA

(mg/kg/day)"



1.8E-04

(mg/kg/day)

5.0E-03

(mg/kg/day)

0.037



Chloroform

9.4

ug/L

4.0E-06

(mg/kg/day)

3.1E-02

(mg/kg/day)"

1.2E-07

4.2E-05

(mg/kg/day)

1.0E-02

(mg/kg/day)

0.0042



cis-1,2-Dichloroethene

1.88

ug/L

8.0E-07

(mg/kg/day)

NA

(mg/kg/day)"



8.5E-06

(mg/kg/day)

2.0E-03

(mg/kg/day)

0.0042



Methyl Tert-Butyl Ether

15

ug/L

6.4E-06

(mg/kg/day)

1.8E-03

(mg/kg/day)"

1.1E-08

6.8E-05

(mg/kg/day)

NA

(mg/kg/day)





Tetrachloroethene

65.7

ug/L

2.8E-05

(mg/kg/day)

2.1E-03

(mg/kg/day)"

5.9E-08

3.0E-04

(mg/kg/day)

6.0E-03

(mg/kg/day)

0.049



Trichloroethene

10.6

ug/L

4.5E-06

(mg/kg/day)

4.6E-02

(mg/kg/day)"

2.1E-07

4.8E-05

(mg/kg/day)

5.0E-04

(mg/kg/day)

0.095



Vinyl Chloride

0.57

ug/L

2.4E-07

(mg/kg/day)

7.2E-01

(mg/kg/day)"

1.7E-07

2.6E-06

(mg/kg/day)

3.0E-03

(mg/kg/day)

0.00086



1,4-Dioxane

3.84

ug/L

1.6E-06

(mg/kg/day)

1.0E-01

(mg/kg/day)"

1.6E-07

1.7E-05

(mg/kg/day)

3.0E-02

(mg/kg/day)

0.00058



Bis(2-ethylhexyl)phthalate

11

ug/L

4.7E-06

(mg/kg/day)

1.4E-02

(mg/kg/day)"

6.5E-08

5.0E-05

(mg/kg/day)

2.0E-02

(mg/kg/day)

0.0025



Caprolactam

2800

ug/L

1.2E-03

(mg/kg/day)

NA

(mg/kg/day)"



1.3E-02

(mg/kg/day)

5.0E-01

(mg/kg/day)

0.025



Aluminum

57655

ug/L

2.4E-02

(mg/kg/day)

NA

(mg/kg/day)"



2.6E-01

(mg/kg/day)

1.0E+00

(mg/kg/day)

0.26



Antimony

1.31

ug/L

5.6E-07

(mg/kg/day)

NA

(mg/kg/day)"



5.9E-06

(mg/kg/day)

4.0E-04

(mg/kg/day)

0.015



Arsenic

12.8

ug/L

5.4E-06

(mg/kg/day)

1.5E+00

(mg/kg/day)"

8.1E-06

5.8E-05

(mg/kg/day)

3.0E-04

(mg/kg/day)

0.19



Barium

674

ug/L

2.9E-04

(mg/kg/day)

NA

(mg/kg/day)"



3.0E-03

(mg/kg/day)

2.0E-01

(mg/kg/day)

0.015



Beryllium

3.46

ug/L

1.5E-06

(mg/kg/day)

NA

(mg/kg/day)"



1.6E-05

(mg/kg/day)

2.0E-03

(mg/kg/day)

0.0078



Cadmium

0.424

ug/L

1.8E-07

(mg/kg/day)

NA

(mg/kg/day)"



1.9E-06

(mg/kg/day)

5.0E-04

(mg/kg/day)

0.0038



Cobalt

63.9

ug/L

2.7E-05

(mg/kg/day)

NA

(mg/kg/day)"



2.9E-04

(mg/kg/day)

3.0E-04

(mg/kg/day)

0.96



Copper

75.2

ug/L

3.2E-05

(mg/kg/day)

NA

(mg/kg/day)"



3.4E-04

(mg/kg/day)

4.0E-02

(mg/kg/day)

0.0085



Iron

45400

ug/L

1.9E-02

(mg/kg/day)

NA

(mg/kg/day)"



2.0E-01

(mg/kg/day)

7.0E-01

(mg/kg/day)

0.29



Lead

23.1

ug/L

9.8E-06

(mg/kg/day)

NA

(mg/kg/day)"



1.0E-04

(mg/kg/day)

NA

(mg/kg/day)





Manganese

2525

ug/L

1.1E-03

(mg/kg/day)

NA

(mg/kg/day)"



1.1E-02

(mg/kg/day)

2.4E-02

(mg/kg/day)

0.47



Mercury

0.128

ug/L

5.4E-08

(mg/kg/day)

NA

(mg/kg/day)"



5.8E-07

(mg/kg/day)

3.0E-04

(mg/kg/day)

0.0019



Nickel

51.7

ug/L

2.2E-05

(mg/kg/day)

NA

(mg/kg/day)"



2.3E-04

(mg/kg/day)

2.0E-02

(mg/kg/day)

0.012



Selenium

3.1

ug/L

1.3E-06

(mg/kg/day)

NA

(mg/kg/day)"



1.4E-05

(mg/kg/day)

5.0E-03

(mg/kg/day)

0.0028



Thallium

0.539

ug/L

2.3E-07

(mg/kg/day)

NA

(mg/kg/day)"



2.4E-06

(mg/kg/day)

1.0E-05

(mg/kg/day)

0.24



Vanadium

12.3

ug/L

5.2E-06

(mg/kg/day)

NA

(mg/kg/day)"



5.5E-05

(mg/kg/day)

5.0E-03

(mg/kg/day)

0.011



Zinc

378

ug/L

1.6E-04

(mg/kg/day)

NA

(mg/kg/day)"



1.7E-03

(mg/kg/day)

3.0E-01

(mg/kg/day)

0.0057

Exp. Route Total





8.9E-06



2.7

Dermal

2-Butanone

1300

ug/L

2.0E-06

(mg/kg/day)

NA

(mg/kg/day)"



2.1E-05

(mg/kg/day)

6.0E-01

(mg/kg/day)

0.000035



2-Hexanone

41

ug/L

2.6E-07

(mg/kg/day)

NA

(mg/kg/day)"



2.8E-06

(mg/kg/day)

5.0E-03

(mg/kg/day)

0.00056



Chloroform

9.4

ug/L

9.3E-08

(mg/kg/day)

3.1E-02

(mg/kg/day)"

2.9E-09

9.9E-07

(mg/kg/day)

1.0E-02

(mg/kg/day)

0.00010



cis-1,2-Dichloroethene

1.88

ug/L

2.4E-08

(mg/kg/day)

NA

(mg/kg/day)"



2.6E-07

(mg/kg/day)

2.0E-03

(mg/kg/day)

0.00013



Methyl Tert-Butyl Ether

15

ug/L

4.0E-08

(mg/kg/day)

1.8E-03

(mg/kg/day)"

7.2E-11

4.2E-07

(mg/kg/day)

NA

(mg/kg/day)





Tetrachloroethene

65.7

ug/L

4.5E-06

(mg/kg/day)

2.1E-03

(mg/kg/day)"

9.5E-09

4.8E-05

(mg/kg/day)

6.0E-03

(mg/kg/day)

0.008



Trichloroethene

10.6

ug/L

1.9E-07

(mg/kg/day)

4.6E-02

(mg/kg/day)"

8.9E-09

2.0E-06

(mg/kg/day)

5.0E-04

(mg/kg/day)

0.0041



Vinyl Chloride

0.57

ug/L

3.8E-09

(mg/kg/day)

7.2E-01

(mg/kg/day)"

2.7E-09

4.0E-08

(mg/kg/day)

3.0E-03

(mg/kg/day)

0.000013



1,4-Dioxane

3.84

ug/L

2.5E-09

(mg/kg/day)

1.0E-01

(mg/kg/day)"

2.5E-10

2.6E-08

(mg/kg/day)

3.0E-02

(mg/kg/day)

0.00000088



Bis(2-ethylhexyl)phthalate

11

ug/L

0.0E+00

(mg/kg/day)

1.4E-02

(mg/kg/day)"



0.0E+00

(mg/kg/day)

2.0E-02

(mg/kg/day)





Caprolactam

2800

ug/L

6.5E-06

(mg/kg/day)

NA

(mg/kg/day)"



6.9E-05

(mg/kg/day)

5.0E-01

(mg/kg/day)

0.00014



Aluminum

57655

ug/L

3.6E-05

(mg/kg/day)

NA

(mg/kg/day)"



3.8E-04

(mg/kg/day)

1.0E+00

(mg/kg/day)

0.00038



Antimony

1.31

ug/L

8.2E-10

(mg/kg/day)

NA

(mg/kg/day)"



8.7E-09

(mg/kg/day)

6.0E-05

(mg/kg/day)

0.00014



Arsenic

12.8

ug/L

8.0E-09

(mg/kg/day)

1.5E+00

(mg/kg/day)"

1.2E-08

8.5E-08

(mg/kg/day)

3.0E-04

(mg/kg/day)

0.00028



Barium

674

ug/L

4.2E-07

(mg/kg/day)

NA

(mg/kg/day)"



4.5E-06

(mg/kg/day)

1.4E-02

(mg/kg/day)

0.00032



Beryllium

3.46

ug/L

2.2E-09

(mg/kg/day)

NA

(mg/kg/day)"



2.3E-08

(mg/kg/day)

1.4E-05

(mg/kg/day)

0.0016



Cadmium

0.424

ug/L

2.6E-10

(mg/kg/day)

NA

(mg/kg/day)"



2.8E-09

(mg/kg/day)

2.5E-05

(mg/kg/day)

0.00011



Cobalt

63.9

ug/L

1.6E-08

(mg/kg/day)

NA

(mg/kg/day)"



1.7E-07

(mg/kg/day)

3.0E-04

(mg/kg/day)

0.00056



Copper

75.2

ug/L

4.7E-08

(mg/kg/day)

NA

(mg/kg/day)"



5.0E-07

(mg/kg/day)

4.0E-02

(mg/kg/day)

0.000012



Iron

45400

ug/L

2.8E-05

(mg/kg/day)

NA

(mg/kg/day)"



3.0E-04

(mg/kg/day)

7.0E-01

(mg/kg/day)

0.00043



Lead

23.1

ug/L

1.4E-09

(mg/kg/day)

NA

(mg/kg/day)"



1.5E-08

(mg/kg/day)

NA

(mg/kg/day)





Manganese

2525

ug/L

1.6E-06

(mg/kg/day)

NA

(mg/kg/day)"



1.7E-05

(mg/kg/day)

9.6E-04

(mg/kg/day)

0.017



Mercury

0.128

ug/L

8.0E-11

(mg/kg/day)

NA

(mg/kg/day)"



8.5E-10

(mg/kg/day)

2.1E-05

(mg/kg/day)

0.000040



Nickel

51.7

ug/L

6.4E-09

(mg/kg/day)

NA

(mq/kq/dav)



6.8E-08

(mg/kg/day)

8.0E-04

(mg/kg/day)

0.000085

Groundwater

Groundwater


-------
TABLE 7.6.CTE

CALCULATION OF CHEMICAL CANCER RISKS AND NON-CANCER HAZARDS
CENTRAL TENDENCY EXPOSURES
OLD WILMINGTON ROAD SITE
PAGE 3 OF 3

Scenario Timeframe: Future

Receptor Population: Industrial Worker

Receptor Age: Adult	

Medium

Exposure Medium

Exposure Point

Exposure Route

Chemical of

EPC

Cancer Risk Calculations

Non-Cancer Hazard Calculations









Potential Concern

Value

Units

Intake/Exposure Concentration

CSF/Unit Risk

Cancer Risk

Intake/Exposure Concentration

RfD/RfC

Hazard Quotient















Value

Units

Value

Units



Value

Units

Value

Units



Groundwater

Groundwater

OWRGC

Dermal

Selenium

3.1

ug/L

1.9E-09

(mg/kg/day)

NA

(mg/kg/day)"1



2.1E-08

(mg/kg/day)

5.0E-03

(mg/kg/day)

0.0000041









Thallium

0.539

ug/L

3.4E-10

(mg/kg/day)

NA

(mg/kg/day)"1



3.6E-09

(mg/kg/day)

1.0E-05

(mg/kg/day)

0.00036









Vanadium

12.3

ug/L

7.7E-09

(mg/kg/day)

NA

(mg/kg/day)"1



8.1E-08

(mg/kg/day)

1.3E-04

(mg/kg/day)

0.00063









Zinc

378

ug/L

1.4E-07

(mg/kg/day)

NA

(mg/kg/day)"1



1.5E-06

(mg/kg/day)

3.0E-01

(mg/kg/day)

0.0000050







Exp. Route Total





3.6E-08



0.035





Exposure Point Total



9.0E-06



2.8



Exposure Medium Total



9.0E-06



2.8



Air

OWR

Inhalation

2-Butanone

1.7E-02

mg/m3

9.5E-04

(mg/m3)

NA

(ug/m3)"1



1.0E-02

(mg/m3)

5.0E+00

(mg/m3)

0.0020









2-Hexanone

6.5E-04

mg/m3

3.7E-05

(mg/m3)

NA

(ug/m3)"1



3.9E-04

(mg/m3)

3.0E-02

(mg/m3)

0.013









Chloroform

4.0E-04

mg/m3

2.3E-05

(mg/m3)

2.3E-05

(ug/m3)"1

5.2E-07

2.4E-04

(mg/m3)

9.8E-02

(mg/m3)

0.0024









cis-1,2-Dichloroethene

8.7E-05

mg/m3

4.9E-06

(mg/m3)

NA

(ug/m3)"1



5.2E-05

(mg/m3)

NA

(mg/m3)











Methyl Tert-Butyl Ether

5.7E-04

mg/m3

3.2E-05

(mg/m3)

2.6E-07

(ug/m3)"1

8.4E-09

3.4E-04

(mg/m3)

3.0E+00

(mg/m3)

0.00011









Tetrachloroethene

2.6E-03

mg/m3

1.4E-04

(mg/m3)

2.6E-07

(ug/m3)"1

3.8E-08

1.5E-03

(mg/m3)

4.0E-02

(mg/m3)

0.038









Trichloroethene

4.5E-04

mg/m3

2.5E-05

(mg/m3)

4.1E-06

(ug/m3)"1

1.0E-07

2.7E-04

(mg/m3)

2.0E-03

(mg/m3)

0.13









Vinyl Chloride

3.2E-05

mg/m3

1.8E-06

(mg/m3)

4.4E-06

(ug/m3)"1

7.9E-09

1.9E-05

(mg/m3)

1.0E-01

(mg/m3)

0.00019









1,4-Dioxane

4.8E-06

mg/m3

2.7E-07

(mg/m3)

5.0E-06

(ug/m3)"1

1.4E-09

2.9E-06

(mg/m3)

3.0E-02

(mg/m3)

0.000097









Bis(2-ethylhexyl)phthalate

0.0E+00

mg/m3

0.0E+00

(mg/m3)

2.4E-06

(ug/m3)"1



0.0E+00

(mg/m3)

NA

(mg/m3)











Caprolactam

0.0E+00

mg/m3

0.0E+00

(mg/m3)

NA

(ug/m3)"1



0.0E+00

(mg/m3)

2.2E-03

(mg/m3)











Aluminum

0.0E+00

mg/m3

0.0E+00

(mg/m3)

NA

(ug/m3)"1



0.0E+00

(mg/m3)

5.0E-03

(mg/m3)











Antimony

0.0E+00

mg/m3

0.0E+00

(mg/m3)

NA

(ug/m3)"1



0.0E+00

(mg/m3)

NA

(mg/m3)











Arsenic

0.0E+00

mg/m3

0.0E+00

(mg/m3)

4.3E-03

(ug/m3)"1



0.0E+00

(mg/m3)

1.5E-05

(mg/m3)











Barium

0.0E+00

mg/m3

0.0E+00

(mg/m3)

NA

(ug/m3)"1



0.0E+00

(mg/m3)

5.0E-04

(mg/m3)











Beryllium

0.0E+00

mg/m3

0.0E+00

(mg/m3)

2.4E-03

(ug/m3)"1



0.0E+00

(mg/m3)

2.0E-05

(mg/m3)











Cadmium

0.0E+00

mg/m3

0.0E+00

(mg/m3)

1.8E-03

(ug/m3)"1



0.0E+00

(mg/m3)

1.0E-05

(mg/m3)











Cobalt

0.0E+00

mg/m3

0.0E+00

(mg/m3)

9.0E-03

(ug/m3)"1



0.0E+00

(mg/m3)

6.0E-06

(mg/m3)











Copper

0.0E+00

mg/m3

0.0E+00

(mg/m3)

NA

(ug/m3)"1



0.0E+00

(mg/m3)

NA

(mg/m3)











Iron

0.0E+00

mg/m3

0.0E+00

(mg/m3)

NA

(ug/m3)"1



0.0E+00

(mg/m3)

NA

(mg/m3)











Lead

0.0E+00

mg/m3

0.0E+00

(mg/m3)

NA

(ug/m3)"1



0.0E+00

(mg/m3)

NA

(mg/m3)











Manganese

0.0E+00

mg/m3

0.0E+00

(mg/m3)

NA

(ug/m3)"1



0.0E+00

(mg/m3)

5.0E-05

(mg/m3)











Mercury

0.0E+00

mg/m3

0.0E+00

(mg/m3)

NA

(ug/m3)"1



0.0E+00

(mg/m3)

3.0E-04

(mg/m3)











Nickel

0.0E+00

mg/m3

0.0E+00

(mg/m3)

2.6E-04

(ug/m3)"1



0.0E+00

(mg/m3)

9.0E-05

(mg/m3)











Selenium

0.0E+00

mg/m3

0.0E+00

(mg/m3)

NA

(ug/m3)"1



0.0E+00

(mg/m3)

2.0E-02

(mg/m3)











Thallium

0.0E+00

mg/m3

0.0E+00

(mg/m3)

NA

(ug/m3)"1



0.0E+00

(mg/m3)

NA

(mg/m3)











Vanadium

0.0E+00

mg/m3

0.0E+00

(mg/m3)

NA

(ug/m3)"1



0.0E+00

(mg/m3)

1.0E-04

(mg/m3)











Zinc

0.0E+00

mg/m3

0.0E+00

(mg/m3)

NA

(ug/m3)"1



0.0E+00

(mg/m3)

NA

(mg/m3)









Exp. Route Total





6.8E-07



0.19





Exposure Point Total



6.8E-07



0.19



Exposure Medium Total



6.8E-07



0.19

Medium Total



9.7E-06



3.0

Total of Receptor Risks Across All Media

1.0E-05

Total of Receptor Hazards Across All Media

3.1

Notes:

1 - Mutagenic chemicals were evaluated in accordance with USEPA's Supplemental Guidance for Assessing Susceptibility from Early-Life Exposure to Carcinogens (2005).


-------
TABLE 7.7.CTE

CALCULATION OF CHEMICAL CANCER RISKS AND NON-CANCER HAZARDS
CENTRAL TENDENCY EXPOSURES
OLD WILMINGTON ROAD SITE
PAGE 1 OF 3

Scenario Timeframe: Future
Receptor Population: Residents

Receptor Age: Child	

Medium

Exposure Medium

Exposure Point

Exposure Route

Chemical of

EPC

Cancer Risk Calculations

Non-Cancer Hazard Calculations









Potential Concern

Value

Units

Intake/Exposure Concentration

CSF/Unit Risk

Cancer Risk

Intake/Exposure Concentration

RfD/RfC

Hazard Quotient















Value

Units

Value

Units



Value

Units

Value

Units



Surface/Subsurface Soil

Surface/Subsurface Soil

OWR

Ingestion

Benzo(a)pyrene

0.252

mg/kg

2.0E-07

(mg/kg/day)

1.0E+00

(mg/kg/day)"

2.0E-07

1.1E-06

(mg/kg/day)

3.0E-04

(mg/kg/day)

0.0036









Naphthalene

9.8

mg/kg

1.2E-06

(mg/kg/day)

NA

(mg/kg/day)"



4.2E-05

(mg/kg/day)

2.0E-02

(mg/kg/day)

0.0021









Dieldrin

0.11

mg/kg

1.3E-08

(mg/kg/day)

1.6E+01

(mg/kg/day)"

2.1E-07

4.7E-07

(mg/kg/day)

5.0E-05

(mg/kg/day)

0.0094









Aluminum

9940

mg/kg

1.2E-03

(mg/kg/day)

NA

(mg/kg/day)"



4.2E-02

(mg/kg/day)

1.0E+00

(mg/kg/day)

0.042









Antimony

6.48

mg/kg

7.9E-07

(mg/kg/day)

NA

(mg/kg/day)"



2.8E-05

(mg/kg/day)

4.0E-04

(mg/kg/day)

0.069









Arsenic

3.95

mg/kg

2.9E-07

(mg/kg/day)

1.5E+00

(mg/kg/day)"

4.3E-07

1.0E-05

(mg/kg/day)

3.0E-04

(mg/kg/day)

0.034









Cobalt

6.32

mg/kg

7.7E-07

(mg/kg/day)

NA

(mg/kg/day)"



2.7E-05

(mg/kg/day)

3.0E-04

(mg/kg/day)

0.090









Copper

660

mg/kg

8.1E-05

(mg/kg/day)

NA

(mg/kg/day)"



2.8E-03

(mg/kg/day)

4.0E-02

(mg/kg/day)

0.071









Iron

19200

mg/kg

2.3E-03

(mg/kg/day)

NA

(mg/kg/day)"



8.2E-02

(mg/kg/day)

7.0E-01

(mg/kg/day)

0.12









Lead

71.4

mg/kg

8.7E-06

(mg/kg/day)

NA

(mg/kg/day)"



3.1E-04

(mg/kg/day)

NA

(mg/kg/day)











Manganese

388

mg/kg

4.7E-05

(mg/kg/day)

NA

(mg/kg/day)"



1.7E-03

(mg/kg/day)

2.4E-02

(mg/kg/day)

0.069









Thallium

2.13

mg/kg

2.6E-07

(mg/kg/day)

NA

(mg/kg/day)"



9.1E-06

(mg/kg/day)

1.0E-05

(mg/kg/day)

0.91









Vanadium

23.6

mg/kg

2.9E-06

(mg/kg/day)

NA

(mg/kg/day)"



1.0E-04

(mg/kg/day)

5.0E-03

(mg/kg/day)

0.020









Zinc

380

mg/kg

4.6E-05

(mg/kg/day)

NA

(mg/kg/day)"



1.6E-03

(mg/kg/day)

3.0E-01

(mg/kg/day)

0.0054







Exp. Route Total





8.5E-07



1.4







Dermal

Benzo(a)pyrene

0.252

mg/kg

2.5E-08

(mg/kg/day)

1.0E+00

(mg/kg/day)"

2.5E-08

1.3E-07

(mg/kg/day)

3.0E-04

(mg/kg/day)

0.00044









Naphthalene

9.8

mg/kg

1.5E-07

(mg/kg/day)

NA

(mg/kg/day)"



5.2E-06

(mg/kg/day)

2.0E-02

(mg/kg/day)

0.00026









Dieldrin

0.11

mg/kg

1.3E-09

(mg/kg/day)

1.6E+01

(mg/kg/day)"

2.0E-08

4.5E-08

(mg/kg/day)

5.0E-05

(mg/kg/day)

0.00089









Aluminum

9940

mg/kg

1.2E-05

(mg/kg/day)

NA

(mg/kg/day)"



4.0E-04

(mg/kg/day)

1.0E+00

(mg/kg/day)

0.00040









Antimony

6.48

mg/kg

7.5E-09

(mg/kg/day)

NA

(mg/kg/day)"



2.6E-07

(mg/kg/day)

6.0E-05

(mg/kg/day)

0.0044









Arsenic

3.95

mg/kg

1.4E-08

(mg/kg/day)

1.5E+00

(mg/kg/day)"

2.1E-08

4.8E-07

(mg/kg/day)

3.0E-04

(mg/kg/day)

0.0016









Cobalt

6.32

mg/kg

7.3E-09

(mg/kg/day)

NA

(mg/kg/day)"



2.6E-07

(mg/kg/day)

3.0E-04

(mg/kg/day)

0.00085









Copper

660

mg/kg

7.7E-07

(mg/kg/day)

NA

(mg/kg/day)"



2.7E-05

(mg/kg/day)

4.0E-02

(mg/kg/day)

0.00067









Iron

19200

mg/kg

2.2E-05

(mg/kg/day)

NA

(mg/kg/day)"



7.8E-04

(mg/kg/day)

7.0E-01

(mg/kg/day)

0.0011









Lead

71.4

mg/kg

0.0E+00

(mg/kg/day)

NA

(mg/kg/day)"



0.0E+00

(mg/kg/day)

NA

(mg/kg/day)











Manganese

388

mg/kg

4.5E-07

(mg/kg/day)

NA

(mg/kg/day)"



1.6E-05

(mg/kg/day)

9.6E-04

(mg/kg/day)

0.016









Thallium

2.13

mg/kg

2.5E-09

(mg/kg/day)

NA

(mg/kg/day)"



8.6E-08

(mg/kg/day)

1.0E-05

(mg/kg/day)

0.0086









Vanadium

23.6

mg/kg

2.7E-08

(mg/kg/day)

NA

(mg/kg/day)"



9.6E-07

(mg/kg/day)

1.3E-04

(mg/kg/day)

0.0074









Zinc

380

mg/kg

4.4E-07

(mg/kg/day)

NA

(mg/kg/day)"



1.5E-05

(mg/kg/day)

3.0E-01

(mg/kg/day)

0.000051







Exp. Route Total





6.6E-08



0.043





Exposure Point Total



9.1E-07



1.5



Exposure Medium Total



9.1E-07



1.5



Air

OWR

Inhalation

Benzo(a)pyrene

7.8E-11

mg/m3

9.3E-12

(mg/m3)

6.0E-04

(ug/m3)"1

5.6E-12

5.0E-11

(mg/m3)

2.0E-06

(mg/m3)

0.000025









Naphthalene

1.7E-04

mg/m3

3.0E-06

(mg/m3)

3.4E-05

(ug/m3)"1

1.0E-07

1.1E-04

(mg/m3)

3.0E-03

(mg/m3)

0.035









Dieldrin

3.4E-11

mg/m3

6.2E-13

(mg/m3)

4.6E-03

(ug/m3)"1

2.9E-12

2.2E-11

(mg/m3)

NA

(mg/m3)











Aluminum

3.1E-06

mg/m3

5.6E-08

(mg/m3)

NA

(ug/m3)"1



2.0E-06

(mg/m3)

5.0E-03

(mg/m3)

0.00039









Antimony

2.0E-09

mg/m3

3.7E-11

(mg/m3)

NA

(ug/m3)"1



1.3E-09

(mg/m3)

NA

(mg/m3)











Arsenic

1.2E-09

mg/m3

2.2E-11

(mg/m3)

4.3E-03

(ug/m3)"1

9.6E-11

7.8E-10

(mg/m3)

1.5E-05

(mg/m3)

0.000052









Cobalt

2.0E-09

mg/m3

3.6E-11

(mg/m3)

9.0E-03

(ug/m3)"1

3.2E-10

1.3E-09

(mg/m3)

6.0E-06

(mg/m3)

0.00021









Copper

2.0E-07

mg/m3

3.7E-09

(mg/m3)

NA

(ug/m3)"1



1.3E-07

(mg/m3)

NA

(mg/m3)











Iron

5.9E-06

mg/m3

1.1E-07

(mg/m3)

NA

(ug/m3)"1



3.8E-06

(mg/m3)

NA

(mg/m3)











Lead

2.2E-08

mg/m3

4.0E-10

(mg/m3)

NA

(ug/m3)"1



1.4E-08

(mg/m3)

NA

(mg/m3)











Manganese

1.2E-07

mg/m3

2.2E-09

(mg/m3)

NA

(ug/m3)"1



7.7E-08

(mg/m3)

5.0E-05

(mg/m3)

0.0015









Thallium

6.6E-10

mg/m3

1.2E-11

(mg/m3)

NA

(ug/m3)"1



4.2E-10

(mg/m3)

NA

(mg/m3)











Vanadium

7.3E-09

mg/m3

1.3E-10

(mg/m3)

NA

(ug/m3)"1



4.7E-09

(mg/m3)

1.0E-04

(mg/m3)

0.000047









Zinc

1.2E-07

mg/m3

2.1E-09

(mg/m3)

NA

(ug/m3)"1



7.5E-08

(mg/m3)

NA

(mg/m3)









Exp. Route Total





1.0E-07



0.038





Exposure Point Total



1.0E-07



0.038



Exposure Medium Total



1.0E-07



0.038

Medium Total



1.0E-06



1.5


-------
TABLE 7.7.CTE

CALCULATION OF CHEMICAL CANCER RISKS AND NON-CANCER HAZARDS
CENTRAL TENDENCY EXPOSURES
OLD WILMINGTON ROAD SITE
PAGE 2 OF 3

Scenario Timeframe: Future
Receptor Population: Residents

Receptor Age: Child	

Exposure Medium

Exposure Route

Chemical of

EPC

Cancer Risk Calculations

Non-Cancer Hazard Calculations



Potential Concern

Value

Units

Intake/Exposure Concentration

CSF/Unit Risk

Cancer Risk

Intake/Exposure Concentration

RfD/RfC

Hazard Quotient









Value

Units

Value

Units



Value

Units

Value

Units



Ingestion

2-Butanone

1300

ug/L

1.1E-03

(mg/kg/day)

NA

(mg/kg/day)"



2.5E-02

(mg/kg/day)

6.0E-01

(mg/kg/day)

0.042



2-Hexanone

41

ug/L

3.4E-05

(mg/kg/day)

NA

(mg/kg/day)"



7.9E-04

(mg/kg/day)

5.0E-03

(mg/kg/day)

0.16



Chloroform

9.4

ug/L

7.7E-06

(mg/kg/day)

3.1E-02

(mg/kg/day)"

2.4E-07

1.8E-04

(mg/kg/day)

1.0E-02

(mg/kg/day)

0.018



cis-1,2-Dichloroethene

1.88

ug/L

1.5E-06

(mg/kg/day)

NA

(mg/kg/day)"



3.6E-05

(mg/kg/day)

2.0E-03

(mg/kg/day)

0.018



Methyl Tert-Butyl Ether

15

ug/L

1.2E-05

(mg/kg/day)

1.8E-03

(mg/kg/day)"

2.2E-08

2.9E-04

(mg/kg/day)

NA

(mg/kg/day)





Tetrachloroethene

65.7

ug/L

5.4E-05

(mg/kg/day)

2.1E-03

(mg/kg/day)"

1.1E-07

1.3E-03

(mg/kg/day)

6.0E-03

(mg/kg/day)

0.21



Trichloroethene (Mutagenic)

10.6

ug/L

6.7E-05

(mg/kg/day)

9.3E-03

(mg/kg/day)"

6.2E-07

2.0E-04

(mg/kg/day)

NA

(mg/kg/day)





Trichloroethene (Nonmutagenic

10.6

ug/L

8.7E-06

(mg/kg/day)

3.7E-02

(mg/kg/day)"

3.2E-07

2.0E-04

(mg/kg/day)

5.0E-04

(mg/kg/day)

0.41



Vinyl Chloride

0.57

ug/L

1.8E-05

(mg/kg/day)

7.2E-01

(mg/kg/day)"

1.3E-05

1.1E-05

(mg/kg/day)

3.0E-03

(mg/kg/day)

0.0037



1,4-Dioxane

3.84

ug/L

3.2E-06

(mg/kg/day)

1.0E-01

(mg/kg/day)"

3.2E-07

7.4E-05

(mg/kg/day)

3.0E-02

(mg/kg/day)

0.0025



Bis(2-ethylhexyl)phthalate

11

ug/L

9.1E-06

(mg/kg/day)

1.4E-02

(mg/kg/day)"

1.3E-07

2.1E-04

(mg/kg/day)

2.0E-02

(mg/kg/day)

0.011



Caprolactam

2800

ug/L

2.3E-03

(mg/kg/day)

NA

(mg/kg/day)"



5.4E-02

(mg/kg/day)

5.0E-01

(mg/kg/day)

0.11



Aluminum

57655

ug/L

4.8E-02

(mg/kg/day)

NA

(mg/kg/day)"



1.1E+00

(mg/kg/day)

1.0E+00

(mg/kg/day)

1.11



Antimony

1.31

ug/L

1.1E-06

(mg/kg/day)

NA

(mg/kg/day)"



2.5E-05

(mg/kg/day)

4.0E-04

(mg/kg/day)

0.063



Arsenic

12.8

ug/L

1.1E-05

(mg/kg/day)

1.5E+00

(mg/kg/day)"

1.6E-05

2.5E-04

(mg/kg/day)

3.0E-04

(mg/kg/day)

0.82



Barium

674

ug/L

5.6E-04

(mg/kg/day)

NA

(mg/kg/day)"



1.3E-02

(mg/kg/day)

2.0E-01

(mg/kg/day)

0.065



Beryllium

3.46

ug/L

2.9E-06

(mg/kg/day)

NA

(mg/kg/day)"



6.7E-05

(mg/kg/day)

2.0E-03

(mg/kg/day)

0.033



Cadmium

0.424

ug/L

3.5E-07

(mg/kg/day)

NA

(mg/kg/day)"



8.2E-06

(mg/kg/day)

5.0E-04

(mg/kg/day)

0.016



Cobalt

63.9

ug/L

5.3E-05

(mg/kg/day)

NA

(mg/kg/day)"



1.2E-03

(mg/kg/day)

3.0E-04

(mg/kg/day)

4.1



Copper

75.2

ug/L

6.2E-05

(mg/kg/day)

NA

(mg/kg/day)"



1.4E-03

(mg/kg/day)

4.0E-02

(mg/kg/day)

0.0362



Iron

45400

ug/L

3.7E-02

(mg/kg/day)

NA

(mg/kg/day)"



8.7E-01

(mg/kg/day)

7.0E-01

(mg/kg/day)

1.25



Lead

23.1

ug/L

1.9E-05

(mg/kg/day)

NA

(mg/kg/day)"



4.4E-04

(mg/kg/day)

NA

(mg/kg/day)





Manganese

2525

ug/L

2.1E-03

(mg/kg/day)

NA

(mg/kg/day)"



4.9E-02

(mg/kg/day)

2.4E-02

(mg/kg/day)

2.0



Mercury

0.128

ug/L

1.1E-07

(mg/kg/day)

NA

(mg/kg/day)"



2.5E-06

(mg/kg/day)

3.0E-04

(mg/kg/day)

0.0082



Nickel

51.7

ug/L

4.3E-05

(mg/kg/day)

NA

(mg/kg/day)"



9.9E-04

(mg/kg/day)

2.0E-02

(mg/kg/day)

0.050



Selenium

3.1

ug/L

2.6E-06

(mg/kg/day)

NA

(mg/kg/day)"



6.0E-05

(mg/kg/day)

5.0E-03

(mg/kg/day)

0.012



Thallium

0.539

ug/L

4.4E-07

(mg/kg/day)

NA

(mg/kg/day)"



1.0E-05

(mg/kg/day)

1.0E-05

(mg/kg/day)

1.04



Vanadium

12.3

ug/L

1.0E-05

(mg/kg/day)

NA

(mg/kg/day)"



2.4E-04

(mg/kg/day)

5.0E-03

(mg/kg/day)

0.047



Zinc

378

ug/L

3.1E-04

(mg/kg/day)

NA

(mg/kg/day)"



7.3E-03

(mg/kg/day)

3.0E-01

(mg/kg/day)

0.024

Exp. Route Total





3.0E-05



12

Dermal

2-Butanone

1300

ug/L

1.2E-05

(mg/kg/day)

NA

(mg/kg/day)"



2.8E-04

(mg/kg/day)

6.0E-01

(mg/kg/day)

0.00046



2-Hexanone

41

ug/L

1.7E-06

(mg/kg/day)

NA

(mg/kg/day)"



3.9E-05

(mg/kg/day)

5.0E-03

(mg/kg/day)

0.0078



Chloroform

9.4

ug/L

8.3E-07

(mg/kg/day)

3.1E-02

(mg/kg/day)"

2.6E-08

1.9E-05

(mg/kg/day)

1.0E-02

(mg/kg/day)

0.0019



cis-1,2-Dichloroethene

1.88

ug/L

2.3E-07

(mg/kg/day)

NA

(mg/kg/day)"



5.4E-06

(mg/kg/day)

2.0E-03

(mg/kg/day)

0.0027



Methyl Tert-Butyl Ether

15

ug/L

3.4E-07

(mg/kg/day)

1.8E-03

(mg/kg/day)"

6.0E-10

7.8E-06

(mg/kg/day)

NA

(mg/kg/day)





Tetrachloroethene

65.7

ug/L

3.8E-05

(mg/kg/day)

2.1E-03

(mg/kg/day)"

8.1E-08

9.0E-04

(mg/kg/day)

6.0E-03

(mg/kg/day)

0.15



Trichloroethene (Mutagenic)

10.6

ug/L

1.3E-05

(mg/kg/day)

9.3E-03

(mg/kg/day)"

1.2E-07

4.0E-05

(mg/kg/day)

NA

(mg/kg/day)





Trichloroethene (Nonmutagenic

10.6

ug/L

1.7E-06

(mg/kg/day)

3.7E-02

(mg/kg/day)"

6.4E-08

4.0E-05

(mg/kg/day)

5.0E-04

(mg/kg/day)

0.080



Vinyl Chloride

0.57

ug/L

1.6E-06

(mg/kg/day)

7.2E-01

(mg/kg/day)"

1.2E-06

1.0E-06

(mg/kg/day)

3.0E-03

(mg/kg/day)

0.00033



1,4-Dioxane

3.84

ug/L

1.4E-08

(mg/kg/day)

1.0E-01

(mg/kg/day)"

1.4E-09

3.2E-07

(mg/kg/day)

3.0E-02

(mg/kg/day)

0.000011



Bis(2-ethylhexyl)phthalate

11

ug/L

0.0E+00

(mg/kg/day)

1.4E-02

(mg/kg/day)"



0.0E+00

(mg/kg/day)

2.0E-02

(mg/kg/day)





Caprolactam

2800

ug/L

3.5E-05

(mg/kg/day)

NA

(mg/kg/day)"



8.1E-04

(mg/kg/day)

5.0E-01

(mg/kg/day)

0.0016



Aluminum

57655

ug/L

2.2E-04

(mg/kg/day)

NA

(mg/kg/day)"



5.2E-03

(mg/kg/day)

1.0E+00

(mg/kg/day)

0.0052



Antimony

1.31

ug/L

5.0E-09

(mg/kg/day)

NA

(mg/kg/day)"



1.2E-07

(mg/kg/day)

6.0E-05

(mg/kg/day)

0.0020



Arsenic

12.8

ug/L

4.9E-08

(mg/kg/day)

1.5E+00

(mg/kg/day)"

7.4E-08

1.1E-06

(mg/kg/day)

3.0E-04

(mg/kg/day)

0.0038



Barium

674

ug/L

2.6E-06

(mg/kg/day)

NA

(mg/kg/day)"



6.1E-05

(mg/kg/day)

1.4E-02

(mg/kg/day)

0.0043



Beryllium

3.46

ug/L

1.3E-08

(mg/kg/day)

NA

(mg/kg/day)"



3.1E-07

(mg/kg/day)

1.4E-05

(mg/kg/day)

0.022



Cadmium

0.424

ug/L

1.6E-09

(mg/kg/day)

NA

(mg/kg/day)"



3.8E-08

(mg/kg/day)

2.5E-05

(mg/kg/day)

0.0015



Cobalt

63.9

ug/L

9.8E-08

(mg/kg/day)

NA

(mg/kg/day)"



2.3E-06

(mg/kg/day)

3.0E-04

(mg/kg/day)

0.0076



Copper

75.2

ug/L

2.9E-07

(mg/kg/day)

NA

(mg/kg/day)"



6.8E-06

(mg/kg/day)

4.0E-02

(mg/kg/day)

0.000169



Iron

45400

ug/L

1.7E-04

(mg/kg/day)

NA

(mg/kg/day)"



4.1E-03

(mg/kg/day)

7.0E-01

(mg/kg/day)

0.0058



Lead

23.1

ug/L

8.9E-09

(mg/kg/day)

NA

(mg/kg/day)"



2.1E-07

(mg/kg/day)

NA

(mg/kg/day)





Manganese

2525

ug/L

9.7E-06

(mg/kg/day)

NA

(mq/kq/dav)



2.3E-04

(mg/kg/day)

9.6E-04

(mg/kg/day)

0.24

Groundwater

Groundwater


-------
TABLE 7.7.CTE

CALCULATION OF CHEMICAL CANCER RISKS AND NON-CANCER HAZARDS
CENTRAL TENDENCY EXPOSURES
OLD WILMINGTON ROAD SITE
PAGE 3 OF 3

Scenario Timeframe: Future
Receptor Population: Residents

Receptor Age: Child	

Medium

Exposure Medium

Exposure Point

Exposure Route

Chemical of

EPC

Cancer Risk Calculations

Non-Cancer Hazard Calculations









Potential Concern

Value

Units

Intake/Exposure Concentration

CSF/Unit Risk

Cancer Risk

Intake/Exposure Concentration

RfD/RfC

Hazard Quotient















Value

Units

Value

Units



Value

Units

Value

Units



Groundwater

Groundwater

OWRGC

Dermal

Mercury

0.128

ug/L

4.9E-10

(mg/kg/day)

NA

(mg/kg/day)"



1.1E-08

(mg/kg/day)

2.1E-05

(mg/kg/day)

0.00055









Nickel

51.7

ug/L

4.0E-08

(mg/kg/day)

NA

(mg/kg/day)"



9.3E-07

(mg/kg/day)

8.0E-04

(mg/kg/day)

0.0012









Selenium

3.1

ug/L

1.2E-08

(mg/kg/day)

NA

(mg/kg/day)"



2.8E-07

(mg/kg/day)

5.0E-03

(mg/kg/day)

0.000056









Thallium

0.539

ug/L

2.1E-09

(mg/kg/day)

NA

(mg/kg/day)"



4.8E-08

(mg/kg/day)

1.0E-05

(mg/kg/day)

0.0048









Vanadium

12.3

ug/L

4.7E-08

(mg/kg/day)

NA

(mg/kg/day)"



1.1E-06

(mg/kg/day)

1.3E-04

(mg/kg/day)

0.0085









Zinc

378

ug/L

8.7E-07

(mg/kg/day)

NA

(mg/kg/day)"



2.0E-05

(mg/kg/day)

3.0E-01

(mg/kg/day)

0.000068







Exp. Route Total





1.5E-06



0.55





Exposure Point Total



3.2E-05



12



Exposure Medium Total



3.2E-05



12

Medium Total



3.2E-05



12

Sediment

Sediment

OWR

Ingestion

Cobalt

14

mg/kg

1.9E-07

(mg/kg/day)

NA

(mg/kg/day)"1



6.6E-06

(mg/kg/day)

3.0E-04

(mg/kg/day)

0.022









Nickel

1500

mg/kg

2.0E-05

(mg/kg/day)

NA

(mg/kg/day)"1



7.1E-04

(mg/kg/day)

2.0E-02

(mg/kg/day)

0.036







Exp. Route Total













0.058







Dermal

Cobalt

14

mg/kg

1.8E-09

(mg/kg/day)

NA

(mg/kg/day)"1



6.3E-08

(mg/kg/day)

3.0E-04

(mg/kg/day)

0.000









Nickel

1500

mg/kg

1.9E-07

(mg/kg/day)

NA

(mg/kg/day)"1



6.8E-06

(mg/kg/day)

8.0E-04

(mg/kg/day)

0.0085







Exp. Route Total













0.009





Exposure Point Total







0.07



Exposure Medium Total







0.07

Medium Total







0.07

Total of Receptor Risks Across All Media

3.3E-05

Total of Receptor Hazards Across All Media

14

Notes:

1 - Mutagenic chemicals were evaluated in accordance with USEPA's Supplemental Guidance for Assessing Susceptibility from Early-Life Exposure to Carcinogens (2005).


-------
TABLE 7.8.CTE

CALCULATION OF CHEMICAL CANCER RISKS AND NON-CANCER HAZARDS
CENTRAL TENDENCY EXPOSURES
OLD WILMINGTON ROAD SITE
PAGE 1 OF 4

Scenario Timeframe: Future
Receptor Population: Residents

Receptor Age: Adult	

Medium

Exposure Medium

Exposure Point

Exposure Route

Chemical of

EPC

Cancer Risk Calculations

Non-Cancer Hazard Calculations









Potential Concern

Value

Units

Intake/Exposure Concentration

CSF/Unit Risk

Cancer Risk

Intake/Exposure Concentration

RfD/RfC

Hazard Quotient















Value

Units

Value

Units



Value

Units

Value

Units



Surface/Subsurface Soil

Surface/Subsurface Soil

OWR

Ingestion

Benzo(a)pyrene

0.252

mg/kg

1.6E-08

(mg/kg/day)

1.0E+00

(mg/kg/day)"

1.6E-08

1.0E-07

(mg/kg/day)

3.0E-04

(mg/kg/day)

0.00034









Naphthalene

9.8

mg/kg

3.9E-07

(mg/kg/day)

NA

(mg/kg/day)"



3.9E-06

(mg/kg/day)

2.0E-02

(mg/kg/day)

0.00020









Dieldrin

0.11

mg/kg

4.4E-09

(mg/kg/day)

1.6E+01

(mg/kg/day)"

7.1E-08

4.4E-08

(mg/kg/day)

5.0E-05

(mg/kg/day)

0.00088









Aluminum

9940

mg/kg

4.0E-04

(mg/kg/day)

NA

(mg/kg/day)"



4.0E-03

(mg/kg/day)

1.0E+00

(mg/kg/day)

0.0040









Antimony

6.48

mg/kg

2.6E-07

(mg/kg/day)

NA

(mg/kg/day)"



2.6E-06

(mg/kg/day)

4.0E-04

(mg/kg/day)

0.0065









Arsenic

3.95

mg/kg

9.5E-08

(mg/kg/day)

1.5E+00

(mg/kg/day)"

1.4E-07

9.5E-07

(mg/kg/day)

3.0E-04

(mg/kg/day)

0.0032









Cobalt

6.32

mg/kg

2.5E-07

(mg/kg/day)

NA

(mg/kg/day)"



2.5E-06

(mg/kg/day)

3.0E-04

(mg/kg/day)

0.0084









Copper

660

mg/kg

2.6E-05

(mg/kg/day)

NA

(mg/kg/day)"



2.6E-04

(mg/kg/day)

4.0E-02

(mg/kg/day)

0.0066









Iron

19200

mg/kg

7.7E-04

(mg/kg/day)

NA

(mg/kg/day)"



7.7E-03

(mg/kg/day)

7.0E-01

(mg/kg/day)

0.011









Lead

71.4

mg/kg

2.9E-06

(mg/kg/day)

NA

(mg/kg/day)"



2.9E-05

(mg/kg/day)

NA

(mg/kg/day)











Manganese

388

mg/kg

1.6E-05

(mg/kg/day)

NA

(mg/kg/day)"



1.6E-04

(mg/kg/day)

2.4E-02

(mg/kg/day)

0.0065









Thallium

2.13

mg/kg

8.5E-08

(mg/kg/day)

NA

(mg/kg/day)"



8.5E-07

(mg/kg/day)

1.0E-05

(mg/kg/day)

0.085









Vanadium

23.6

mg/kg

9.5E-07

(mg/kg/day)

NA

(mg/kg/day)"



9.5E-06

(mg/kg/day)

5.0E-03

(mg/kg/day)

0.0019









Zinc

380

mg/kg

1.5E-05

(mg/kg/day)

NA

(mg/kg/day)"



1.5E-04

(mg/kg/day)

3.0E-01

(mg/kg/day)

0.00051







Exp. Route Total





2.3E-07



0.14







Dermal

Benzo(a)pyrene

0.252

mg/kg

2.5E-09

(mg/kg/day)

1.0E+00

(mg/kg/day)"

2.5E-09

1.6E-08

(mg/kg/day)

3.0E-04

(mg/kg/day)

0.000053









Naphthalene

9.8

mg/kg

6.2E-08

(mg/kg/day)

NA

(mg/kg/day)"



6.2E-07

(mg/kg/day)

2.0E-02

(mg/kg/day)

0.000031









Dieldrin

0.11

mg/kg

5.3E-10

(mg/kg/day)

1.6E+01

(mg/kg/day)"

8.5E-09

5.3E-09

(mg/kg/day)

5.0E-05

(mg/kg/day)

0.00011









Aluminum

9940

mg/kg

4.8E-06

(mg/kg/day)

NA

(mg/kg/day)"



4.8E-05

(mg/kg/day)

1.0E+00

(mg/kg/day)

0.000048









Antimony

6.48

mg/kg

3.1E-09

(mg/kg/day)

NA

(mg/kg/day)"



3.1E-08

(mg/kg/day)

6.0E-05

(mg/kg/day)

0.00052









Arsenic

3.95

mg/kg

5.7E-09

(mg/kg/day)

1.5E+00

(mg/kg/day)"

8.6E-09

5.7E-08

(mg/kg/day)

3.0E-04

(mg/kg/day)

0.00019









Cobalt

6.32

mg/kg

3.1E-09

(mg/kg/day)

NA

(mg/kg/day)"



3.1E-08

(mg/kg/day)

3.0E-04

(mg/kg/day)

0.00010









Copper

660

mg/kg

3.2E-07

(mg/kg/day)

NA

(mg/kg/day)"



3.2E-06

(mg/kg/day)

4.0E-02

(mg/kg/day)

0.000080









Iron

19200

mg/kg

9.3E-06

(mg/kg/day)

NA

(mg/kg/day)"



9.3E-05

(mg/kg/day)

7.0E-01

(mg/kg/day)

0.00013









Lead

71.4

mg/kg

0.0E+00

(mg/kg/day)

NA

(mg/kg/day)"



0.0E+00

(mg/kg/day)

NA

(mg/kg/day)











Manganese

388

mg/kg

1.9E-07

(mg/kg/day)

NA

(mg/kg/day)"



1.9E-06

(mg/kg/day)

9.6E-04

(mg/kg/day)

0.0020









Thallium

2.13

mg/kg

1.0E-09

(mg/kg/day)

NA

(mg/kg/day)"



1.0E-08

(mg/kg/day)

1.0E-05

(mg/kg/day)

0.0010









Vanadium

23.6

mg/kg

1.1E-08

(mg/kg/day)

NA

(mg/kg/day)"



1.1E-07

(mg/kg/day)

1.3E-04

(mg/kg/day)

0.00088









Zinc

380

mg/kg

1.8E-07

(mg/kg/day)

NA

(mg/kg/day)"



1.8E-06

(mg/kg/day)

3.0E-01

(mg/kg/day)

0.0000061







Exp. Route Total





2.0E-08



0.0051





Exposure Point Total



2.5E-07



0.14



Exposure Medium Total



2.5E-07



0.14



Air

OWR

Inhalation

Benzo(a)pyrene

7.8E-11

mg/m3

7.8E-12

(mg/m3)

6.0E-04

(ug/m3)"1

4.7E-12

5.0E-11

(mg/m3)

2.0E-06

(mg/m3)

0.000025









Naphthalene

1.7E-04

mg/m3

1.1E-05

(mg/m3)

3.4E-05

(ug/m3)"1

3.6E-07

1.1E-04

(mg/m3)

3.0E-03

(mg/m3)

0.035









Dieldrin

3.4E-11

mg/m3

2.2E-12

(mg/m3)

4.6E-03

(ug/m3)"1

1.0E-11

2.2E-11

(mg/m3)

NA

(mg/m3)











Aluminum

3.1E-06

mg/m3

2.0E-07

(mg/m3)

NA

(ug/m3)"1



2.0E-06

(mg/m3)

5.0E-03

(mg/m3)

0.00039









Antimony

2.0E-09

mg/m3

1.3E-10

(mg/m3)

NA

(ug/m3)"1



1.3E-09

(mg/m3)

NA

(mg/m3)











Arsenic

1.2E-09

mg/m3

7.8E-11

(mg/m3)

4.3E-03

(ug/m3)"1

3.4E-10

7.8E-10

(mg/m3)

1.5E-05

(mg/m3)

0.000052









Cobalt

2.0E-09

mg/m3

1.3E-10

(mg/m3)

9.0E-03

(ug/m3)"1

1.1E-09

1.3E-09

(mg/m3)

6.0E-06

(mg/m3)

0.00021









Copper

2.0E-07

mg/m3

1.3E-08

(mg/m3)

NA

(ug/m3)"1



1.3E-07

(mg/m3)

NA

(mg/m3)











Iron

5.9E-06

mg/m3

3.8E-07

(mg/m3)

NA

(ug/m3)"1



3.8E-06

(mg/m3)

NA

(mg/m3)











Lead

2.2E-08

mg/m3

1.4E-09

(mg/m3)

NA

(ug/m3)"1



1.4E-08

(mg/m3)

NA

(mg/m3)











Manganese

1.2E-07

mg/m3

7.7E-09

(mg/m3)

NA

(ug/m3)"1



7.7E-08

(mg/m3)

5.0E-05

(mg/m3)

0.0015









Thallium

6.6E-10

mg/m3

4.2E-11

(mg/m3)

NA

(ug/m3)"1



4.2E-10

(mg/m3)

NA

(mg/m3)











Vanadium

7.3E-09

mg/m3

4.7E-10

(mg/m3)

NA

(ug/m3)"1



4.7E-09

(mg/m3)

1.0E-04

(mg/m3)

0.000047









Zinc

1.2E-07

mg/m3

7.5E-09

(mg/m3)

NA

(ug/m3)"1



7.5E-08

(mg/m3)

NA

(mg/m3)









Exp. Route Total





3.6E-07



0.038





Exposure Point Total



3.6E-07



0.038



Exposure Medium Total



3.6E-07



0.038

Medium Total



6.1E-07



0.18


-------
TABLE 7.8.CTE

CALCULATION OF CHEMICAL CANCER RISKS AND NON-CANCER HAZARDS
CENTRAL TENDENCY EXPOSURES
OLD WILMINGTON ROAD SITE
PAGE 2 OF 4

Scenario Timeframe: Future
Receptor Population: Residents

Receptor Age: Adult	

Exposure Medium

Exposure Route

Chemical of

EPC

Cancer Risk Calculations

Non-Cancer Hazard Calculations



Potential Concern

Value

Units

Intake/Exposure Concentration

CSF/Unit Risk

Cancer Risk

Intake/Exposure Concentration

RfD/RfC

Hazard Quotient









Value

Units

Value

Units



Value

Units

Value

Units



Ingestion

2-Butanone

1300

ug/L

1.6E-03

(mg/kg/day)

NA

(mg/kg/day)"



1.3E-02

(mg/kg/day)

6.0E-01

(mg/kg/day)

0.021



2-Hexanone

41

ug/L

5.1E-05

(mg/kg/day)

NA

(mg/kg/day)"



3.9E-04

(mg/kg/day)

5.0E-03

(mg/kg/day)

0.079



Chloroform

9.4

ug/L

1.2E-05

(mg/kg/day)

3.1E-02

(mg/kg/day)"

3.6E-07

9.0E-05

(mg/kg/day)

1.0E-02

(mg/kg/day)

0.0090



cis-1,2-Dichloroethene

1.88

ug/L

2.3E-06

(mg/kg/day)

NA

(mg/kg/day)"



1.8E-05

(mg/kg/day)

2.0E-03

(mg/kg/day)

0.0090



Methyl Tert-Butyl Ether

15

ug/L

1.9E-05

(mg/kg/day)

1.8E-03

(mg/kg/day)"

3.3E-08

1.4E-04

(mg/kg/day)

NA

(mg/kg/day)





Tetrachloroethene

65.7

ug/L

8.1E-05

(mg/kg/day)

2.1E-03

(mg/kg/day)"

1.7E-07

6.3E-04

(mg/kg/day)

6.0E-03

(mg/kg/day)

0.11



Trichloroethene (Mutagenic)

10.6

ug/L

1.9E-05

(mg/kg/day)

9.3E-03

(mg/kg/day)"

1.8E-07

1.0E-04

(mg/kg/day)

NA

(mg/kg/day)





Trichloroethene (Nonmutagenic

10.6

ug/L

1.3E-05

(mg/kg/day)

3.7E-02

(mg/kg/day)"

4.8E-07

1.0E-04

(mg/kg/day)

5.0E-04

(mg/kg/day)

0.20



Vinyl Chloride

0.57

ug/L

7.0E-07

(mg/kg/day)

7.2E-01

(mg/kg/day)"

5.1E-07

5.5E-06

(mg/kg/day)

3.0E-03

(mg/kg/day)

0.0018



1,4-Dioxane

3.84

ug/L

4.7E-06

(mg/kg/day)

1.0E-01

(mg/kg/day)"

4.7E-07

3.7E-05

(mg/kg/day)

3.0E-02

(mg/kg/day)

0.0012



Bis(2-ethylhexyl)phthalate

11

ug/L

1.4E-05

(mg/kg/day)

1.4E-02

(mg/kg/day)"

1.9E-07

1.1E-04

(mg/kg/day)

2.0E-02

(mg/kg/day)

0.0053



Caprolactam

2800

ug/L

3.5E-03

(mg/kg/day)

NA

(mg/kg/day)"



2.7E-02

(mg/kg/day)

5.0E-01

(mg/kg/day)

0.054



Aluminum

57655

ug/L

7.1E-02

(mg/kg/day)

NA

(mg/kg/day)"



5.5E-01

(mg/kg/day)

1.0E+00

(mg/kg/day)

0.55



Antimony

1.31

ug/L

1.6E-06

(mg/kg/day)

NA

(mg/kg/day)"



1.3E-05

(mg/kg/day)

4.0E-04

(mg/kg/day)

0.031



Arsenic

12.8

ug/L

1.6E-05

(mg/kg/day)

1.5E+00

(mg/kg/day)"

2.4E-05

1.2E-04

(mg/kg/day)

3.0E-04

(mg/kg/day)

0.41



Barium

674

ug/L

8.3E-04

(mg/kg/day)

NA

(mg/kg/day)"



6.5E-03

(mg/kg/day)

2.0E-01

(mg/kg/day)

0.032



Beryllium

3.46

ug/L

4.3E-06

(mg/kg/day)

NA

(mg/kg/day)"



3.3E-05

(mg/kg/day)

2.0E-03

(mg/kg/day)

0.017



Cadmium

0.424

ug/L

5.2E-07

(mg/kg/day)

NA

(mg/kg/day)"



4.1E-06

(mg/kg/day)

5.0E-04

(mg/kg/day)

0.0082



Cobalt

63.9

ug/L

7.9E-05

(mg/kg/day)

NA

(mg/kg/day)"



6.1E-04

(mg/kg/day)

3.0E-04

(mg/kg/day)

2.0



Copper

75.2

ug/L

9.3E-05

(mg/kg/day)

NA

(mg/kg/day)"



7.2E-04

(mg/kg/day)

4.0E-02

(mg/kg/day)

0.018



Iron

45400

ug/L

5.6E-02

(mg/kg/day)

NA

(mg/kg/day)"



4.4E-01

(mg/kg/day)

7.0E-01

(mg/kg/day)

0.62



Lead

23.1

ug/L

2.9E-05

(mg/kg/day)

NA

(mg/kg/day)"



2.2E-04

(mg/kg/day)

NA

(mg/kg/day)





Manganese

2525

ug/L

3.1E-03

(mg/kg/day)

NA

(mg/kg/day)"



2.4E-02

(mg/kg/day)

2.4E-02

(mg/kg/day)

1.01



Mercury

0.128

ug/L

1.6E-07

(mg/kg/day)

NA

(mg/kg/day)"



1.2E-06

(mg/kg/day)

3.0E-04

(mg/kg/day)

0.0041



Nickel

51.7

ug/L

6.4E-05

(mg/kg/day)

NA

(mg/kg/day)"



5.0E-04

(mg/kg/day)

2.0E-02

(mg/kg/day)

0.025



Selenium

3.1

ug/L

3.8E-06

(mg/kg/day)

NA

(mg/kg/day)"



3.0E-05

(mg/kg/day)

5.0E-03

(mg/kg/day)

0.0060



Thallium

0.539

ug/L

6.7E-07

(mg/kg/day)

NA

(mg/kg/day)"



5.2E-06

(mg/kg/day)

1.0E-05

(mg/kg/day)

0.52



Vanadium

12.3

ug/L

1.5E-05

(mg/kg/day)

NA

(mg/kg/day)"



1.2E-04

(mg/kg/day)

5.0E-03

(mg/kg/day)

0.024



Zinc

378

ug/L

4.7E-04

(mg/kg/day)

NA

(mg/kg/day)"



3.6E-03

(mg/kg/day)

3.0E-01

(mg/kg/day)

0.012

Exp. Route Total





2.6E-05



5.8

Dermal

2-Butanone

1300

ug/L

1.6E-05

(mg/kg/day)

NA

(mg/kg/day)"



1.2E-04

(mg/kg/day)

6.0E-01

(mg/kg/day)

0.00021



2-Hexanone

41

ug/L

2.1E-06

(mg/kg/day)

NA

(mg/kg/day)"



1.7E-05

(mg/kg/day)

5.0E-03

(mg/kg/day)

0.0033



Chloroform

9.4

ug/L

7.5E-07

(mg/kg/day)

3.1E-02

(mg/kg/day)"

2.3E-08

5.9E-06

(mg/kg/day)

1.0E-02

(mg/kg/day)

0.00059



cis-1,2-Dichloroethene

1.88

ug/L

2.0E-07

(mg/kg/day)

NA

(mg/kg/day)"



1.5E-06

(mg/kg/day)

2.0E-03

(mg/kg/day)

0.0008



Methyl Tert-Butyl Ether

15

ug/L

3.2E-07

(mg/kg/day)

1.8E-03

(mg/kg/day)"

5.8E-10

2.5E-06

(mg/kg/day)

NA

(mg/kg/day)





Tetrachloroethene

65.7

ug/L

3.7E-05

(mg/kg/day)

2.1E-03

(mg/kg/day)"

7.7E-08

2.9E-04

(mg/kg/day)

6.0E-03

(mg/kg/day)

0.048



Trichloroethene (Mutagenic)

10.6

ug/L

2.3E-06

(mg/kg/day)

9.3E-03

(mg/kg/day)"

2.1E-08

1.2E-05

(mg/kg/day)

NA

(mg/kg/day)





Trichloroethene (Nonmutagenic

10.6

ug/L

1.6E-06

(mg/kg/day)

3.7E-02

(mg/kg/day)"

5.8E-08

1.2E-05

(mg/kg/day)

5.0E-04

(mg/kg/day)

0.024



Vinyl Chloride

0.57

ug/L

3.1E-08

(mg/kg/day)

7.2E-01

(mg/kg/day)"

2.2E-08

2.4E-07

(mg/kg/day)

3.0E-03

(mg/kg/day)

0.000080



1,4-Dioxane

3.84

ug/L

2.0E-08

(mg/kg/day)

1.0E-01

(mg/kg/day)"

2.0E-09

1.6E-07

(mg/kg/day)

3.0E-02

(mg/kg/day)

0.0000052



Bis(2-ethylhexyl)phthalate

11

ug/L

0.0E+00

(mg/kg/day)

1.4E-02

(mg/kg/day)"



0.0E+00

(mg/kg/day)

2.0E-02

(mg/kg/day)





Caprolactam

2800

ug/L

5.3E-05

(mg/kg/day)

NA

(mg/kg/day)"



4.1E-04

(mg/kg/day)

5.0E-01

(mg/kg/day)

0.00082



Aluminum

57655

ug/L

2.9E-04

(mg/kg/day)

NA

(mg/kg/day)"



2.3E-03

(mg/kg/day)

1.0E+00

(mg/kg/day)

0.0023



Antimony

1.31

ug/L

6.6E-09

(mg/kg/day)

NA

(mg/kg/day)"



5.2E-08

(mg/kg/day)

6.0E-05

(mg/kg/day)

0.00086



Arsenic

12.8

ug/L

6.5E-08

(mg/kg/day)

1.5E+00

(mg/kg/day)"

9.7E-08

5.0E-07

(mg/kg/day)

3.0E-04

(mg/kg/day)

0.0017



Barium

674

ug/L

3.4E-06

(mg/kg/day)

NA

(mg/kg/day)"



2.7E-05

(mg/kg/day)

1.4E-02

(mg/kg/day)

0.0019



Beryllium

3.46

ug/L

1.8E-08

(mg/kg/day)

NA

(mg/kg/day)"



1.4E-07

(mg/kg/day)

1.4E-05

(mg/kg/day)

0.0097



Cadmium

0.424

ug/L

2.1E-09

(mg/kg/day)

NA

(mg/kg/day)"



1.7E-08

(mg/kg/day)

2.5E-05

(mg/kg/day)

0.00067



Cobalt

63.9

ug/L

1.3E-07

(mg/kg/day)

NA

(mg/kg/day)"



1.0E-06

(mg/kg/day)

3.0E-04

(mg/kg/day)

0.0034



Copper

75.2

ug/L

3.8E-07

(mg/kg/day)

NA

(mg/kg/day)"



3.0E-06

(mg/kg/day)

4.0E-02

(mg/kg/day)

0.000074



Iron

45400

ug/L

2.3E-04

(mg/kg/day)

NA

(mg/kg/day)"



1.8E-03

(mg/kg/day)

7.0E-01

(mg/kg/day)

0.0026



Lead

23.1

ug/L

1.2E-08

(mg/kg/day)

NA

(mg/kg/day)"



9.1E-08

(mg/kg/day)

NA

(mg/kg/day)





Manganese

2525

ug/L

1.3E-05

(mg/kg/day)

NA

(mq/kq/dav)



9.9E-05

(mg/kg/day)

9.6E-04

(mg/kg/day)

0.10

Groundwater

Groundwater


-------
TABLE 7.8.CTE

CALCULATION OF CHEMICAL CANCER RISKS AND NON-CANCER HAZARDS
CENTRAL TENDENCY EXPOSURES
OLD WILMINGTON ROAD SITE
PAGE 3 OF 4

Scenario Timeframe: Future
Receptor Population: Residents

Receptor Age: Adult	

Medium

Exposure Medium

Exposure Point

Exposure Route

Chemical of

EPC

Cancer Risk Calculations

Non-Cancer Hazard Calculations









Potential Concern

Value

Units

Intake/Exposure Concentration

CSF/Unit Risk

Cancer Risk

Intake/Exposure Concentration

RfD/RfC

Hazard Quotient















Value

Units

Value

Units



Value

Units

Value

Units



Groundwater

Groundwater

OWRGC

Dermal

Mercury

0.128

ug/L

6.5E-10

(mg/kg/day)

NA

(mg/kg/day)"



5.0E-09

(mg/kg/day)

2.1E-05

(mg/kg/day)

0.00024









Nickel

51.7

ug/L

5.2E-08

(mg/kg/day)

NA

(mg/kg/day)"



4.1E-07

(mg/kg/day)

8.0E-04

(mg/kg/day)

0.00051









Selenium

3.1

ug/L

1.6E-08

(mg/kg/day)

NA

(mg/kg/day)"



1.2E-07

(mg/kg/day)

5.0E-03

(mg/kg/day)

0.000024









Thallium

0.539

ug/L

2.7E-09

(mg/kg/day)

NA

(mg/kg/day)"



2.1E-08

(mg/kg/day)

1.0E-05

(mg/kg/day)

0.0021









Vanadium

12.3

ug/L

6.2E-08

(mg/kg/day)

NA

(mg/kg/day)"



4.8E-07

(mg/kg/day)

1.3E-04

(mg/kg/day)

0.0037









Zinc

378

ug/L

1.1E-06

(mg/kg/day)

NA

(mg/kg/day)"



8.9E-06

(mg/kg/day)

3.0E-01

(mg/kg/day)

0.000030







Exp. Route Total





3.0E-07



0.21





Exposure Point Total



2.6E-05



6.0



Exposure Medium Total



2.6E-05



6.0



Air

OWR

Inhalation

2-Butanone

1.7E-02

mg/m3

1.4E-03

(mg/m3)

NA

(ug/m3)"1



1.1E-02

(mg/m3)

5.0E+00

(mg/m3)

0.0022









2-Hexanone

6.5E-04

mg/m3

5.4E-05

(mg/m3)

NA

(ug/m3)"1



4.2E-04

(mg/m3)

3.0E-02

(mg/m3)

0.014









Chloroform

4.0E-04

mg/m3

3.3E-05

(mg/m3)

2.3E-05

(ug/m3)"1

7.6E-07

2.6E-04

(mg/m3)

9.8E-02

(mg/m3)

0.0026









cis-1,2-Dichloroethene

8.7E-05

mg/m3

7.1E-06

(mg/m3)

NA

(ug/m3)"1



5.6E-05

(mg/m3)

NA

(mg/m3)











Methyl Tert-Butyl Ether

5.7E-04

mg/m3

4.7E-05

(mg/m3)

2.6E-07

(ug/m3)"1

1.2E-08

3.7E-04

(mg/m3)

3.0E+00

(mg/m3)

0.00012









Tetrachloroethene

2.6E-03

mg/m3

2.1E-04

(mg/m3)

2.6E-07

(ug/m3)"1

5.5E-08

1.6E-03

(mg/m3)

4.0E-02

(mg/m3)

0.041









Trichloroethene (Mutagenic)

4.5E-04

mg/m3

5.3E-05

(mg/m3)

1.0E-06

(ug/m3)"1

5.3E-08

2.9E-04

(mg/m3)

NA

(mg/m3)











Trichloroethene (Nonmutagenic

4.5E-04

mg/m3

3.7E-05

(mg/m3)

3.1E-06

(ug/m3)"1

1.1E-07

2.9E-04

(mg/m3)

2.0E-03

(mg/m3)

0.14









Vinyl Chloride

3.2E-05

mg/m3

2.6E-06

(mg/m3)

4.4E-06

(ug/m3)"1

1.2E-08

2.0E-05

(mg/m3)

1.0E-01

(mg/m3)

0.00020









1,4-Dioxane

4.8E-06

mg/m3

4.0E-07

(mg/m3)

5.0E-06

(ug/m3)"1

2.0E-09

3.1E-06

(mg/m3)

3.0E-02

(mg/m3)

0.00010









Bis(2-ethylhexyl)phthalate

0.0E+00

mg/m3

0.0E+00

(mg/m3)

2.4E-06

(ug/m3)"1



0.0E+00

(mg/m3)

NA

(mg/m3)











Caprolactam

0.0E+00

mg/m3

0.0E+00

(mg/m3)

NA

(ug/m3)"1



0.0E+00

(mg/m3)

2.2E-03

(mg/m3)











Aluminum

0.0E+00

mg/m3

0.0E+00

(mg/m3)

NA

(ug/m3)"1



0.0E+00

(mg/m3)

5.0E-03

(mg/m3)











Antimony

0.0E+00

mg/m3

0.0E+00

(mg/m3)

NA

(ug/m3)"1



0.0E+00

(mg/m3)

NA

(mg/m3)











Arsenic

0.0E+00

mg/m3

0.0E+00

(mg/m3)

4.3E-03

(ug/m3)"1



0.0E+00

(mg/m3)

1.5E-05

(mg/m3)











Barium

0.0E+00

mg/m3

0.0E+00

(mg/m3)

NA

(ug/m3)"1



0.0E+00

(mg/m3)

5.0E-04

(mg/m3)











Beryllium

0.0E+00

mg/m3

0.0E+00

(mg/m3)

2.4E-03

(ug/m3)"1



0.0E+00

(mg/m3)

2.0E-05

(mg/m3)











Cadmium

0.0E+00

mg/m3

0.0E+00

(mg/m3)

1.8E-03

(ug/m3)"1



0.0E+00

(mg/m3)

1.0E-05

(mg/m3)











Cobalt

0.0E+00

mg/m3

0.0E+00

(mg/m3)

9.0E-03

(ug/m3)"1



0.0E+00

(mg/m3)

6.0E-06

(mg/m3)











Copper

0.0E+00

mg/m3

0.0E+00

(mg/m3)

NA

(ug/m3)"1



0.0E+00

(mg/m3)

NA

(mg/m3)











Iron

0.0E+00

mg/m3

0.0E+00

(mg/m3)

NA

(ug/m3)"1



0.0E+00

(mg/m3)

NA

(mg/m3)











Lead

0.0E+00

mg/m3

0.0E+00

(mg/m3)

NA

(ug/m3)"1



0.0E+00

(mg/m3)

NA

(mg/m3)











Manganese

0.0E+00

mg/m3

0.0E+00

(mg/m3)

NA

(ug/m3)"1



0.0E+00

(mg/m3)

5.0E-05

(mg/m3)











Mercury

0.0E+00

mg/m3

0.0E+00

(mg/m3)

NA

(ug/m3)"1



0.0E+00

(mg/m3)

3.0E-04

(mg/m3)











Nickel

0.0E+00

mg/m3

0.0E+00

(mg/m3)

2.6E-04

(ug/m3)"1



0.0E+00

(mg/m3)

9.0E-05

(mg/m3)











Selenium

0.0E+00

mg/m3

0.0E+00

(mg/m3)

NA

(ug/m3)"1



0.0E+00

(mg/m3)

2.0E-02

(mg/m3)











Thallium

0.0E+00

mg/m3

0.0E+00

(mg/m3)

NA

(ug/m3)"1



0.0E+00

(mg/m3)

NA

(mg/m3)











Vanadium

0.0E+00

mg/m3

0.0E+00

(mg/m3)

NA

(ug/m3)"1



0.0E+00

(mg/m3)

1.0E-04

(mg/m3)











Zinc

0.0E+00

mg/m3

0.0E+00

(mg/m3)

NA

(ug/m3)"1



0.0E+00

(mg/m3)

NA

(mg/m3)









Exp. Route Total





1.0E-06



0.20





Exposure Point Total



1.0E-06



0.20



Exposure Medium Total



1.0E-06



0.20

Medium Total



2.7E-05



6.2


-------
TABLE 7.8.CTE

CALCULATION OF CHEMICAL CANCER RISKS AND NON-CANCER HAZARDS
CENTRAL TENDENCY EXPOSURES
OLD WILMINGTON ROAD SITE
PAGE 4 OF 4

Scenario Timeframe: Future
Receptor Population: Residents

Receptor Age: Adult	

Medium

Exposure Medium

Exposure Point

Exposure Route Chemical of

EPC

Cancer Risk Calculations

Non-Cancer Hazard Calculations







Potential Concern

Value

Units

Intake/Exposure Concentration

CSF/Unit Risk

Cancer Risk

Intake/Exposure Concentration

RfD/RfC

Hazard Quotient







|





Value

Units

Value

Units



Value

Units

Value

Units



Sediment

Sediment

OWR

Ingestion Cobalt

14

mg/kg

6.2E-08

(mg/kg/day)

NA

(mg/kg/day)"1



6.2E-07

(mg/kg/day)

3.0E-04

(mg/kg/day)

0.0021







[Nickel

1500

mg/kg

6.7E-06

(mg/kg/day)

NA

(mg/kg/day)"1



6.7E-05

(mg/kg/day)

2.0E-02

(mg/kg/day)

0.0033





I Exp. Route Total |







0.0054







Dermal jCobalt

14

mg/kg

7.5E-10

(mg/kg/day)

NA

(mg/kg/day)"1



7.5E-09

(mg/kg/day)

3.0E-04

(mg/kg/day)

0.0000







| Nickel

1500

mg/kg

8.1E-08

(mg/kg/day)

NA

(mg/kg/day)"1



8.1E-07

(mg/kg/day)

8.0E-04

(mg/kg/day)

0.0010







Exp. Route Total jj











0.0010





Exposure Point Total







0.006



Exposure Medium Total









0.006

Medium Total







0.006

Total of Receptor Risks Across All Media

2.8E-05

Total of Receptor Hazards Across All Media

6.4

Notes:

1 - Mutagenic chemicals were evaluated in accordance with USEPA's Supplemental Guidance for Assessing Susceptibility from Early-Life Exposure to Carcinogens (2005).


-------
TABLE 7.9.CTE

CALCULATION OF CHEMICAL CANCER RISKS AND NON-CANCER HAZARDS
CENTRAL TENDENCY EXPOSURES
OLD WILMINGTON ROAD SITE
PAGE 1 OF 4

Scenario Timeframe: Future
Receptor Population: Residents

Receptor Age: Lifelong (Child and Adult)	

Medium

Exposure Medium

Exposure Point

Exposure Route

Chemical of

EPC

Cancer Risk Calculations

Non-Cancer Hazard Calculations









Potential Concern

Value

Units

Intake/Exposure Concentration

CSF/Unit Risk

Cancer Risk

Intake/Exposure Concentration

RfD/RfC

Hazard Quotient















Value

Units

Value

Units



Value

Units

Value

Units



Surface/Subsurface Soil

Surface/Subsurface Soil

OWR

Ingestion

Benzo(a)pyrene

0.252

mg/kg

2.2E-07

(mg/kg/day)

1.0E+00

(mg/kg/day)"

2.2E-07



















Naphthalene

9.8

mg/kg

1.6E-06

(mg/kg/day)

NA

(mg/kg/day)"





















Dieldrin

0.11

mg/kg

1.8E-08

(mg/kg/day)

1.6E+01

(mg/kg/day)"

2.9E-07



















Aluminum

9940

mg/kg

1.6E-03

(mg/kg/day)

NA

(mg/kg/day)"





















Antimony

6.48

mg/kg

1.1E-06

(mg/kg/day)

NA

(mg/kg/day)"





















Arsenic

3.95

mg/kg

3.8E-07

(mg/kg/day)

1.5E+00

(mg/kg/day)"

5.8E-07



















Cobalt

6.32

mg/kg

1.0E-06

(mg/kg/day)

NA

(mg/kg/day)"





















Copper

660

mg/kg

1.1E-04

(mg/kg/day)

NA

(mg/kg/day)"





















Iron

19200

mg/kg

3.1E-03

(mg/kg/day)

NA

(mg/kg/day)"





















Lead

71.4

mg/kg

1.2E-05

(mg/kg/day)

NA

(mg/kg/day)"





















Manganese

388

mg/kg

6.3E-05

(mg/kg/day)

NA

(mg/kg/day)"





















Thallium

2.13

mg/kg

3.5E-07

(mg/kg/day)

NA

(mg/kg/day)"





















Vanadium

23.6

mg/kg

3.8E-06

(mg/kg/day)

NA

(mg/kg/day)"





















Zinc

380

mg/kg

6.2E-05

(mg/kg/day)

NA

(mg/kg/day)"



















Exp. Route Total





1.1E-06











Dermal

Benzo(a)pyrene

0.252

mg/kg

2.7E-08

(mg/kg/day)

1.0E+00

(mg/kg/day)"

2.7E-08



















Naphthalene

9.8

mg/kg

2.1E-07

(mg/kg/day)

NA

(mg/kg/day)"





















Dieldrin

0.11

mg/kg

1.8E-09

(mg/kg/day)

1.6E+01

(mg/kg/day)"

2.9E-08



















Aluminum

9940

mg/kg

1.6E-05

(mg/kg/day)

NA

(mg/kg/day)"





















Antimony

6.48

mg/kg

1.1E-08

(mg/kg/day)

NA

(mg/kg/day)"





















Arsenic

3.95

mg/kg

1.9E-08

(mg/kg/day)

1.5E+00

(mg/kg/day)"

2.9E-08



















Cobalt

6.32

mg/kg

1.0E-08

(mg/kg/day)

NA

(mg/kg/day)"





















Copper

660

mg/kg

1.1E-06

(mg/kg/day)

NA

(mg/kg/day)"





















Iron

19200

mg/kg

3.2E-05

(mg/kg/day)

NA

(mg/kg/day)"





















Lead

71.4

mg/kg

0.0E+00

(mg/kg/day)

NA

(mg/kg/day)"





















Manganese

388

mg/kg

6.4E-07

(mg/kg/day)

NA

(mg/kg/day)"





















Thallium

2.13

mg/kg

3.5E-09

(mg/kg/day)

NA

(mg/kg/day)"





















Vanadium

23.6

mg/kg

3.9E-08

(mg/kg/day)

NA

(mg/kg/day)"





















Zinc

380

mg/kg

6.2E-07

(mg/kg/day)

NA

(mg/kg/day)"



















Exp. Route Total





8.5E-08









Exposure Point Total



1.2E-06







Exposure Medium Total



1.2E-06







Air

OWR

Inhalation

Benzo(a)pyrene

7.8E-11

mg/m3

1.7E-11

(mg/m3)

6.0E-04

(ug/m3)"1

1.0E-11



















Naphthalene

1.7E-04

mg/m3

1.4E-05

(mg/m3)

3.4E-05

(ug/m3)"1

4.6E-07



















Dieldrin

3.4E-11

mg/m3

2.8E-12

(mg/m3)

4.6E-03

(ug/m3)"1

1.3E-11



















Aluminum

3.1E-06

mg/m3

2.5E-07

(mg/m3)

NA

(ug/m3)"1





















Antimony

2.0E-09

mg/m3

1.6E-10

(mg/m3)

NA

(ug/m3)"1





















Arsenic

1.2E-09

mg/m3

1.0E-10

(mg/m3)

4.3E-03

(ug/m3)"1

4.3E-10



















Cobalt

2.0E-09

mg/m3

1.6E-10

(mg/m3)

9.0E-03

(ug/m3)"1

1.4E-09



















Copper

2.0E-07

mg/m3

1.7E-08

(mg/m3)

NA

(ug/m3)"1





















Iron

5.9E-06

mg/m3

4.9E-07

(mg/m3)

NA

(ug/m3)"1





















Lead

2.2E-08

mg/m3

1.8E-09

(mg/m3)

NA

(ug/m3)"1





















Manganese

1.2E-07

mg/m3

9.9E-09

(mg/m3)

NA

(ug/m3)"1





















Thallium

6.6E-10

mg/m3

5.4E-11

(mg/m3)

NA

(ug/m3)"1





















Vanadium

7.3E-09

mg/m3

6.0E-10

(mg/m3)

NA

(ug/m3)"1





















Zinc

1.2E-07

mg/m3

9.7E-09

(mg/m3)

NA

(ug/m3)"1



















Exp. Route Total





4.6E-07









Exposure Point Total



4.6E-07







Exposure Medium Total



4.6E-07





Medium Total



1.6E-06






-------
TABLE 7.9.CTE

CALCULATION OF CHEMICAL CANCER RISKS AND NON-CANCER HAZARDS
CENTRAL TENDENCY EXPOSURES
OLD WILMINGTON ROAD SITE
PAGE 2 OF 4

Scenario Timeframe: Future
Receptor Population: Residents

Receptor Age: Lifelong (Child and Adult)	

Exposure Medium

Exposure Route

Chemical of

EPC

Cancer Risk Calculations

Non-Cancer Hazard Calculations



Potential Concern

Value

Units

Intake/Exposure Concentration

CSF/Unit Risk

Cancer Risk

Intake/Exposure Concentration

RfD/RfC

Hazard Quotient









Value

Units

Value

Units



Value

Units

Value

Units



Ingestion

2-Butanone
2-Hexanone

1300
41

ug/L
ug/L

2.7E-03
8.4E-05

(mg/kg/day)
(mg/kg/day)

NA
NA

(mg/kg/day)"
(mg/kg/day)"















Chloroform

9.4

ug/L

1.9E-05

(mg/kg/day)

3.1E-02

(mg/kg/day)"

6.0E-07













cis-1,2-Dichloroethene

1.88

ug/L

3.9E-06

(mg/kg/day)

NA

(mg/kg/day)"















Methyl Tert-Butyl Ether

15

ug/L

3.1E-05

(mg/kg/day)

1.8E-03

(mg/kg/day)"

5.6E-08













Tetrachloroethene

65.7

ug/L

1.4E-04

(mg/kg/day)

2.1E-03

(mg/kg/day)"

2.8E-07













Trichloroethene (Mutagenic)

10.6

ug/L

8.6E-05

(mg/kg/day)

9.3E-03

(mg/kg/day)"

8.0E-07













Trichloroethene (Nonmutagenic

10.6

ug/L

2.2E-05

(mg/kg/day)

3.7E-02

(mg/kg/day)"

8.1E-07













Vinyl Chloride

0.57

ug/L

1.8E-05

(mg/kg/day)

7.2E-01

(mg/kg/day)"

1.3E-05













1,4-Dioxane

3.84

ug/L

7.9E-06

(mg/kg/day)

1.0E-01

(mg/kg/day)"

7.9E-07













Bis(2-ethylhexyl)phthalate

11

ug/L

2.3E-05

(mg/kg/day)

1.4E-02

(mg/kg/day)"

3.2E-07













Caprolactam

2800

ug/L

5.8E-03

(mg/kg/day)

NA

(mg/kg/day)"















Aluminum

57655

ug/L

1.2E-01

(mg/kg/day)

NA

(mg/kg/day)"















Antimony

1.31

ug/L

2.7E-06

(mg/kg/day)

NA

(mg/kg/day)"















Arsenic

12.8

ug/L

2.6E-05

(mg/kg/day)

1.5E+00

(mg/kg/day)"

4.0E-05













Barium

674

ug/L

1.4E-03

(mg/kg/day)

NA

(mg/kg/day)"















Beryllium

3.46

ug/L

7.1E-06

(mg/kg/day)

NA

(mg/kg/day)"















Cadmium

0.424

ug/L

8.7E-07

(mg/kg/day)

NA

(mg/kg/day)"















Cobalt

63.9

ug/L

1.3E-04

(mg/kg/day)

NA

(mg/kg/day)"















Copper

75.2

ug/L

1.5E-04

(mg/kg/day)

NA

(mg/kg/day)"















Iron

45400

ug/L

9.4E-02

(mg/kg/day)

NA

(mg/kg/day)"















Lead

23.1

ug/L

4.8E-05

(mg/kg/day)

NA

(mg/kg/day)"















Manganese

2525

ug/L

5.2E-03

(mg/kg/day)

NA

(mg/kg/day)"















Mercury

0.128

ug/L

2.6E-07

(mg/kg/day)

NA

(mg/kg/day)"















Nickel

51.7

ug/L

1.1E-04

(mg/kg/day)

NA

(mg/kg/day)"















Selenium

3.1

ug/L

6.4E-06

(mg/kg/day)

NA

(mg/kg/day)"















Thallium

0.539

ug/L

1.1E-06

(mg/kg/day)

NA

(mg/kg/day)"















Vanadium

12.3

ug/L

2.5E-05

(mg/kg/day)

NA

(mg/kg/day)"















Zinc

378

ug/L

7.8E-04

(mg/kg/day)

NA

(mg/kg/day)"













Exp. Route Total





5.6E-05





Dermal

2-Butanone
2-Hexanone

1300
41

ug/L
ug/L

2.8E-05
3.8E-06

(mg/kg/day)
(mg/kg/day)

NA
NA

(mg/kg/day)"
(mg/kg/day)"















Chloroform

9.4

ug/L

1.6E-06

(mg/kg/day)

3.1E-02

(mg/kg/day)"

4.9E-08













cis-1,2-Dichloroethene

1.88

ug/L

4.3E-07

(mg/kg/day)

NA

(mg/kg/day)"















Methyl Tert-Butyl Ether

15

ug/L

6.6E-07

(mg/kg/day)

1.8E-03

(mg/kg/day)"

1.2E-09













Tetrachloroethene

65.7

ug/L

7.5E-05

(mg/kg/day)

2.1E-03

(mg/kg/day)"

1.6E-07













Trichloroethene (Mutagenic)

10.6

ug/L

1.5E-05

(mg/kg/day)

9.3E-03

(mg/kg/day)"

1.4E-07













Trichloroethene (Nonmutagenic

10.6

ug/L

3.3E-06

(mg/kg/day)

3.7E-02

(mg/kg/day)"

1.2E-07













Vinyl Chloride

0.57

ug/L

1.6E-06

(mg/kg/day)

7.2E-01

(mg/kg/day)"

1.2E-06













1,4-Dioxane

3.84

ug/L

3.4E-08

(mg/kg/day)

1.0E-01

(mg/kg/day)"

3.4E-09













Bis(2-ethylhexyl)phthalate

11

ug/L

0.0E+00

(mg/kg/day)

1.4E-02

(mg/kg/day)"















Caprolactam

2800

ug/L

8.8E-05

(mg/kg/day)

NA

(mg/kg/day)"















Aluminum

57655

ug/L

5.1E-04

(mg/kg/day)

NA

(mg/kg/day)"















Antimony

1.31

ug/L

1.2E-08

(mg/kg/day)

NA

(mg/kg/day)"















Arsenic

12.8

ug/L

1.1E-07

(mg/kg/day)

1.5E+00

(mg/kg/day)"

1.7E-07













Barium

674

ug/L

6.0E-06

(mg/kg/day)

NA

(mg/kg/day)"















Beryllium

3.46

ug/L

3.1E-08

(mg/kg/day)

NA

(mg/kg/day)"















Cadmium

0.424

ug/L

3.8E-09

(mg/kg/day)

NA

(mg/kg/day)"















Cobalt

63.9

ug/L

2.3E-07

(mg/kg/day)

NA

(mg/kg/day)"















Copper

75.2

ug/L

6.7E-07

(mg/kg/day)

NA

(mg/kg/day)"















Iron

45400

ug/L

4.0E-04

(mg/kg/day)

NA

(mg/kg/day)"















Lead

23.1

ug/L

2.1E-08

(mg/kg/day)

NA

(mg/kg/day)"















Manganese

2525

ug/L

2.2E-05

(mg/kg/day)

NA

(mq/kq/dav)













Groundwater

Groundwater


-------
TABLE 7.9.CTE

CALCULATION OF CHEMICAL CANCER RISKS AND NON-CANCER HAZARDS
CENTRAL TENDENCY EXPOSURES
OLD WILMINGTON ROAD SITE
PAGE 3 OF 4

Scenario Timeframe: Future
Receptor Population: Residents

Receptor Age: Lifelong (Child and Adult)	

Medium

Exposure Medium

Exposure Point

Exposure Route

Chemical of

EPC

Cancer Risk Calculations

Non-Cancer Hazard Calculations









Potential Concern

Value

Units

Intake/Exposure Concentration

CSF/Unit Risk

Cancer Risk

Intake/Exposure Concentration

RfD/RfC

Hazard Quotient















Value

Units

Value

Units



Value

Units

Value

Units



Groundwater

Groundwater

OWRGC

Dermal

Mercury

0.128

ug/L

1.1E-09

(mg/kg/day)

NA

(mg/kg/day)"





















Nickel

51.7

ug/L

9.2E-08

(mg/kg/day)

NA

(mg/kg/day)"





















Selenium

3.1

ug/L

2.8E-08

(mg/kg/day)

NA

(mg/kg/day)"





















Thallium

0.539

ug/L

4.8E-09

(mg/kg/day)

NA

(mg/kg/day)"





















Vanadium

12.3

ug/L

1.1E-07

(mg/kg/day)

NA

(mg/kg/day)"





















Zinc

378

ug/L

2.0E-06

(mg/kg/day)

NA

(mg/kg/day)"



















Exp. Route Total





1.8E-06









Exposure Point Total



5.8E-05







Exposure Medium Total



5.8E-05







Air

OWR

Inhalation

2-Butanone

1.7E-02

mg/m3

1.4E-03

(mg/m3)

NA

(ug/m3)"1





















2-Hexanone

6.5E-04

mg/m3

5.4E-05

(mg/m3)

NA

(ug/m3)"1





















Chloroform

4.0E-04

mg/m3

3.3E-05

(mg/m3)

2.3E-05

(ug/m3)"1

7.6E-07



















cis-1,2-Dichloroethene

8.7E-05

mg/m3

7.1E-06

(mg/m3)

NA

(ug/m3)"1





















Methyl Tert-Butyl Ether

5.7E-04

mg/m3

4.7E-05

(mg/m3)

2.6E-07

(ug/m3)"1

1.2E-08



















Tetrachloroethene

2.6E-03

mg/m3

2.1E-04

(mg/m3)

2.6E-07

(ug/m3)"1

5.5E-08



















Trichloroethene (Mutagenic)

4.5E-04

mg/m3

5.3E-05

(mg/m3)

1.0E-06

(ug/m3)"1

5.3E-08



















Trichloroethene (Nonmutagenic

4.5E-04

mg/m3

3.7E-05

(mg/m3)

3.1E-06

(ug/m3)"1

1.1E-07



















Vinyl Chloride

3.2E-05

mg/m3

2.6E-06

(mg/m3)

4.4E-06

(ug/m3)"1

1.2E-08



















1,4-Dioxane

4.8E-06

mg/m3

4.0E-07

(mg/m3)

5.0E-06

(ug/m3)"1

2.0E-09



















Bis(2-ethylhexyl)phthalate

0.0E+00

mg/m3

0.0E+00

(mg/m3)

2.4E-06

(ug/m3)"1





















Caprolactam

0.0E+00

mg/m3

0.0E+00

(mg/m3)

NA

(ug/m3)"1





















Aluminum

0.0E+00

mg/m3

0.0E+00

(mg/m3)

NA

(ug/m3)"1





















Antimony

0.0E+00

mg/m3

0.0E+00

(mg/m3)

NA

(ug/m3)"1





















Arsenic

0.0E+00

mg/m3

0.0E+00

(mg/m3)

4.3E-03

(ug/m3)"1





















Barium

0.0E+00

mg/m3

0.0E+00

(mg/m3)

NA

(ug/m3)"1





















Beryllium

0.0E+00

mg/m3

0.0E+00

(mg/m3)

2.4E-03

(ug/m3)"1





















Cadmium

0.0E+00

mg/m3

0.0E+00

(mg/m3)

1.8E-03

(ug/m3)"1





















Cobalt

0.0E+00

mg/m3

0.0E+00

(mg/m3)

9.0E-03

(ug/m3)"1





















Copper

0.0E+00

mg/m3

0.0E+00

(mg/m3)

NA

(ug/m3)"1





















Iron

0.0E+00

mg/m3

0.0E+00

(mg/m3)

NA

(ug/m3)"1





















Lead

0.0E+00

mg/m3

0.0E+00

(mg/m3)

NA

(ug/m3)"1





















Manganese

0.0E+00

mg/m3

0.0E+00

(mg/m3)

NA

(ug/m3)"1





















Mercury

0.0E+00

mg/m3

0.0E+00

(mg/m3)

NA

(ug/m3)"1





















Nickel

0.0E+00

mg/m3

0.0E+00

(mg/m3)

2.6E-04

(ug/m3)"1





















Selenium

0.0E+00

mg/m3

0.0E+00

(mg/m3)

NA

(ug/m3)"1





















Thallium

0.0E+00

mg/m3

0.0E+00

(mg/m3)

NA

(ug/m3)"1





















Vanadium

0.0E+00

mg/m3

0.0E+00

(mg/m3)

NA

(ug/m3)"1





















Zinc

0.0E+00

mg/m3

0.0E+00

(mg/m3)

NA

(ug/m3)"1



















Exp. Route Total





1.0E-06









Exposure Point Total



1.0E-06







Exposure Medium Total



1.0E-06





Medium Total



5.9E-05






-------
TABLE 7.9.CTE

CALCULATION OF CHEMICAL CANCER RISKS AND NON-CANCER HAZARDS
CENTRAL TENDENCY EXPOSURES
OLD WILMINGTON ROAD SITE
PAGE 4 OF 4

Scenario Timeframe: Future
Receptor Population: Residents

Receptor Age: Lifelong (Child and Adult)	

Medium

Exposure Medium

Exposure Point

Exposure Route Chemical of

EPC

Cancer Risk Calculations

Non-Cancer Hazard Calculations







Potential Concern

Value

Units

Intake/Exposure Concentration

CSF/Unit Risk

Cancer Risk

Intake/Exposure Concentration

RfD/RfC

Hazard Quotient







|





Value

Units

Value

Units



Value

Units

Value

Units



Sediment

Sediment

OWR

Ingestion Cobalt

14

mg/kg

2.5E-07

(mg/kg/day)

NA

(mg/kg/day)"1



















[Nickel

1500

mg/kg

2.7E-05

(mg/kg/day)

NA

(mg/kg/day)"1

















I Exp. Route Total |















Dermal jCobalt

14

mg/kg

2.6E-09

(mg/kg/day)

NA

(mg/kg/day)"1



















| Nickel

1500

mg/kg

2.7E-07

(mg/kg/day)

NA

(mg/kg/day)"1



















Exp. Route Total jj

















Exposure Point Total











Exposure Medium Total











Medium Total









Total of Receptor Risks Across All Media

6.1E-05





Notes:

1 - Mutagenic chemicals were evaluated in accordance with USEPA's Supplemental Guidance for Assessing Susceptibility from Early-Life Exposure to Carcinogens (2005).


-------
RAGS Part D Table 8
Calculation of Radiation Cancer Risks
No tables, Radiation cancer risks were not evaluated for the Old Wilmington Road Site


-------
RAGS Part D Table 9
Summary of Receptor Risks and Hazards for COPCs


-------
LIST OF TABLES
RAGS PART D TABLE 9
SUMMARY OF RECEPTOR RISKS AND HAZARDS FOR COPCs

Table No.

Reasonable Maximum Exposures

9 1 .RME	Current Industrial Workers

9.2.RME	Current Child Residents

9 3 RME	Current Adult Residents

9 4 RME	Current Lifelong Residents

9 5 RME	Future Construction Workers

9 6 RME	Future Industrial Workers

9 7 RME	Future Child Residents

9 8 RME	Future Adult Residents

9 9 RME	Future Lifelong Residents

Central Tendency Exposures

9.1 CTE	Current Industrial Workers

9 2 CTE	Current Child Residents

9 3 CTE	Current Adult Residents

9 4 CTE	Current Lifelong Residents

9 5 CTE	Future Construction Workers

9 6 CTE	Future Industrial Workers

9 7 CTE	Future Child Residents

9 8 CTE	Future Adult Residents

9 9 CTE	Future Lifelong Residents


-------
TABLE 9.1.RME

SUMMARY OF RECEPTOR RISKS AND HAZARDS FOR COPCs
REASONABLE MAXIMUM EXPOSURES
OLD WILMINGTON ROAD SITE
PAGE 1 OF 1

Scenario Timeframe: Current

Receptor Population: Industrial Workers

Receptor Age: Adult	

Medium

Exposure

Exposure

Chemical





Carcinogenic Risk



Non-Carcinogenic Hazard Quotient







Medium

Point

of Potential



























Concern

Ingestion

Inhalation

Dermal

External

Exposure

Primary

Ingestion

Inhalation

Dermal

Exposure















(Radiation)

Routes Total

Target Organ(s)







Routes Total

Surface Soil

Surface Soil

OWR

Benzo(a)pyrene

8.7E-08



4.8E-08



1.4E-07

Developmental, Immune, Reproductive

0.00082



0.00045

0.0013







Naphthalene











Body Weight

0.00042



0.00023

0.00065







Dieldrin

5.4E-07



2.3E-07



7.7E-07

Hepatic

0.0019



0.00080

0.0027







Aluminum











Nervous

0.010



0.00043

0.011







Antimony











Hematologic

0.024



0.0068

0.031







Arsenic

1.5E-06



3.1E-07



1.8E-06

Dermal, CVS

0.0090



0.0019

0.011







Cobalt











Thyroid

0.022



0.00092

0.023







Copper











GS

0.027



0.0011

0.028







Iron











GS

0.025



0.0010

0.026







Lead











NA















Manganese











Nervous

0.016



0.017

0.033







Vanadium











Dermal

0.0046

»

0.0075

0.012







Zinc











Hematologic, Immune

0.0020

-

0.000085

0.0021







Chemical Total

2.1E-06



5.8E-07



2.7E-06



0.14

-

0.039

0.18





Exposure Point Total



2.7E-06



0.18



Exposure Medium Total



2.7E-06



0.18



Air

OWR

Benzo(a)pyrene



4.3E-12





4.3E-12

Developmental, Reproductive



0.000010



0.000010







Naphthalene



4.6E-07





4.6E-07

Nervous, Respiratory



0.013



0.013







Dieldrin



1.3E-11





1.3E-11

NA















Aluminum











Nervous



0.00017



0.00017







Antimony











NA















Arsenic



5.7E-10





5.7E-10

NA



0.000025



0.000025







Cobalt



1.7E-09





1.7E-09

Respiratory



0.000089



0.000089







Copper











NA















Iron











NA















Lead











NA















Manganese











Nervous



0.00064



0.00064







Vanadium

-



-

-



Respiratory

»

0.000019

»

0.000019







Zinc

-



-

-



NA

-

-

-

-







Chemical Total

-

4.6E-07

-

-

4.6E-07





0.014



0.014





Exposure Point Total





4.6E-07



0.014



Exposure Medium Total



4.6E-07



0.014

Vledium Total





3.1E-06



0.19

Receptor Total

Receptor Risk Total

3.1E-06

Receptor HI Total

0.19

Notes:

1 - Mutagenic chemicals were evaluated in accordance with USEPA's Supplemental Guidance for Assessing Susceptibility from Early-Life Exposure to Carcinogens (2005).


-------
TABLE 9.2.RME

SUMMARY OF RECEPTOR RISKS AND HAZARDS FOR COPCs
REASONABLE MAXIMUM EXPOSURES
OLD WILMINGTON ROAD SITE
PAGE 1 OF 1

Scenario Timeframe: Current
Receptor Population: Residents

Receptor Age: Child	

Medium

Exposure

Exposure

Chemical





Carcinogenic Risk



Non-Carcinogenic Hazard Quotient







Medium

Point

of Potential



























Concern

Ingestion

Inhalation

Dermal

External

Exposure

Primary

Ingestion

Inhalation

Dermal

Exposure















(Radiation)

Routes Total

Target Organ(s)







Routes Total

Surface Soil

Surface Soil

OWR

Benzo(a)pyrene

1.7E-06



5.2E-07



2.2E-06

Developmental, Immune, Reproductive

0.012



0.0038

0.016







Naphthalene











Body Weight

0.0063



0.0019

0.0082







Dieldrin

1.9E-06



4.6E-07



2.4E-06

Hepatic

0.028



0.0067

0.035







Aluminum











Nervous

0.15



0.0036

0.16







Antimony











Hematologic

0.36



0.057

0.42







Arsenic

5.2E-06



6.2E-07



5.8E-06

Dermal, CVS

0.14



0.016

0.15







Cobalt











Thyroid

0.32



0.0077

0.33







Copper











GS

0.40



0.0094

0.41







Iron











GS

0.37



0.0088

0.38







Lead











NA















Manganese











Nervous

0.24



0.14

0.39







Vanadium











Dermal

0.069

»

0.063

0.13







Zinc











Hematologic, Immune

0.030

-

0.00071

0.031







Chemical Total

8.8E-06



1.6E-06



1.0E-05



2.1

-

0.32

2.4





Exposure Point Total



1.0E-05



2.4



Exposure Medium Total



1.0E-05



2.4



Air

OWR

Benzo(a)pyrene



2.3E-11





2.3E-11

Developmental, Reproductive



0.000042



0.000042







Naphthalene



4.6E-07





4.6E-07

Nervous, Respiratory



0.053



0.053







Dieldrin



1.3E-11





1.3E-11

NA















Aluminum











Nervous



0.00071



0.00071







Antimony











NA















Arsenic



5.8E-10





5.8E-10

NA



0.00010



0.00010







Cobalt



1.7E-09





1.7E-09

Respiratory



0.00037



0.00037







Copper











NA















Iron











NA















Lead











NA















Manganese











Nervous



0.0027



0.0027







Vanadium











Respiratory



0.000080

»

0.000080







Zinc











NA



-

-

-







Chemical Total



4.6E-07





4.6E-07





0.057



0.057





Exposure Point Total



4.6E-07



0.057



Exposure Medium Total



4.6E-07



0.057

Vledium Total





1.1E-05



2.5

Sediment

Sediment

OWR

Cobalt











Thyroid

0.09

-

0.00

0.09







Nickel











Body Weight

0.14

-

0.085

0.23







Chemical Total













0.23

-

0.09

0.32





Exposure Point Total







0.32



Exposure Medium Total







0.32

Vledium Total







0.32

Receptor Total

Receptor Risk Total

1.1E-05

Receptor HI Total

2.8

Notes:

1 - Mutagenic chemicals were evaluated in accordance with USEPA's Supplemental Guidance for Assessing Susceptibility from Early-Life Exposure to Carcinogens (2005).

Total Body Weight HI

0.2

Total CVS HI

0.2

Total Dermal HI

0.3

Total Developmental HI

0.02

Total GS HI

0.8

Total Hematologic HI

0.4

Total Hepatic HI

0.03

Total Immune HI

0.05

Total Nervous HI

0.6

Total Reproductive HI

0.02

Total Respiratory HI

0.05

Total Thyroid HI

0.4


-------
TABLE 9.3.RME

SUMMARY OF RECEPTOR RISKS AND HAZARDS FOR COPCs
REASONABLE MAXIMUM EXPOSURES
OLD WILMINGTON ROAD SITE
PAGE 1 OF 1

Scenario Timeframe: Current
Receptor Population: Residents

Receptor Age: Adult	

Medium

Exposure

Exposure

Chemical





Carcinogenic Risk



Non-Carcinogenic Hazard Quotient







Medium

Point

of Potential



























Concern

Ingestion

Inhalation

Dermal

External

Exposure

Primary

Ingestion

Inhalation

Dermal

Exposure















(Radiation)

Routes Total

Target Organ(s)







Routes Total

Surface Soil

Surface Soil

OWR

Benzo(a)pyrene

2.0E-07



1.1E-07



3.0E-07

Developmental, Immune, Reproductive

0.0011



0.00063

0.0018







Naphthalene











Body Weight

0.00059



0.00032

0.00091







Dieldrin

6.0E-07



2.5E-07



8.6E-07

Hepatic

0.0026



0.0011

0.0038







Aluminum











Nervous

0.014



0.00061

0.015







Antimony











Hematologic

0.034



0.0095

0.043







Arsenic

1.6E-06



3.4E-07



2.0E-06

Dermal, CVS

0.013



0.0027

0.015







Cobalt











Thyroid

0.030



0.0013

0.032







Copper











GS

0.037



0.0016

0.039







Iron











GS

0.035



0.0015

0.036







Lead











NA















Manganese











Nervous

0.023



0.024

0.047







Vanadium











Dermal

0.0065

»

0.011

0.017







Zinc











Hematologic, Immune

0.0028

-

0.00012

0.0029







Chemical Total

2.4E-06



7.1E-07



3.1E-06



0.20

-

0.054

0.25





Exposure Point Total



3.1E-06



0.25



Exposure Medium Total



3.1E-06



0.25



Air

OWR

Benzo(a)pyrene



2.9E-11





2.9E-11

Developmental, Reproductive



0.000042



0.000042







Naphthalene



1.5E-06





1.5E-06

Nervous, Respiratory



0.053



0.053







Dieldrin



4.3E-11





4.3E-11

NA















Aluminum











Nervous



0.00071



0.00071







Antimony











NA















Arsenic



1.9E-09





1.9E-09

NA



0.00010



0.00010







Cobalt



5.8E-09





5.8E-09

Respiratory



0.00037



0.00037







Copper











NA















Iron











NA















Lead











NA















Manganese











Nervous



0.0027



0.0027







Vanadium











Respiratory



0.000080

»

0.000080







Zinc











NA



-

-

-







Chemical Total



1.5E-06





1.5E-06





0.057



0.057





Exposure Point Total



1.5E-06



0.057



Exposure Medium Total



1.5E-06



0.057

Vledium Total





4.7E-06



0.31

Sediment

Sediment

OWR

Cobalt











Thyroid

0.008

-

0.000

0.009







Nickel











Body Weight

0.013

-

0.014

0.027







Chemical Total













0.022



0.014

0.036





Exposure Point Total







0.036



Exposure Medium Total







0.036

Vledium Total







0.036

Receptor Total

Receptor Risk Total

4.7E-06

Receptor HI Total

0.35

Notes:

1 - Mutagenic chemicals were evaluated in accordance with USEPA's Supplemental Guidance for Assessing Susceptibility from Early-Life Exposure to Carcinogens (2005).


-------
TABLE 9.4.RME

SUMMARY OF RECEPTOR RISKS AND HAZARDS FOR COPCs
REASONABLE MAXIMUM EXPOSURES
OLD WILMINGTON ROAD SITE
PAGE 1 OF 1

Scenario Timeframe: Current
Receptor Population: Residents

Receptor Age: Lifelong (Child and Adult)	

Medium

Exposure
Medium

Exposure
Point

Chemical
of Potential
Concern

Carcinogenic Risk

Non-Carcinogenic Hazard Quotient

Ingestion

Inhalation

Dermal

External
(Radiation)

Exposure
Routes Total

Primary
Target Organ(s)

Ingestion

Inhalation

Dermal

Exposure
Routes Total

Surface Soil

Surface Soil

OWR

Benzo(a)pyrene

Naphthalene

Dieldrin

Aluminum

Antimony

Arsenic

Cobalt

Copper

Iron

Lead

Manganese

Vanadium

Zinc

1.9E-06
2.5E-06

6.8E-06



6.2E-07
7.1E-07

9.6E-07



2.5E-06
3.2E-06

7.8E-06



See Tables 9.2.RME and 9.3.RME for h

azard Indices











Chemical Total

1.1E-05



2.3E-06



1.4E-05











Exposure Point Total



1.4E-05







Exposure Medium Total



1.4E-05







Air

OWR

Benzo(a)pyrene

Naphthalene

Dieldrin

Aluminum

Antimony

Arsenic

Cobalt

Copper

Iron

Lead

Manganese

Vanadium

Zinc



5.2E-11
2.0E-06
5.6E-11

2.5E-09
7.5E-09





5.2E-11
2.0E-06
5.6E-11

2.5E-09
7.5E-09













Chemical Total

-

2.0E-06

-

-

2.0E-06











Exposure Point Total



2.0E-06







Exposure Medium Total



2.0E-06





Medium Total



1.6E-05





Sediment

Sediment

OWR

Cobalt
Nickel



"

















|chemical Total



-



-













Exposure Point Total









| Exposure Medium Total









Medium Total









Receptor Total

Receptor Risk Total

1.6E-05





Notes:

1 - Mutagenic chemicals were evaluated in accordance with USEPA's Supplemental Guidance for Assessing Susceptibility from Early-Life Exposure to Carcinogens (2005).


-------
TABLE 9.5.RME
SUMMARY OF RECEPTOR RISKS AND HAZARDS FOR COPCs
REASONABLE MAXIMUM EXPOSURES
OLD WILMINGTON ROAD SITE
PAGE 1 OF 2

Scenario Timeframe: Future

Receptor Population: Construction Workers

Receptor Age: Adult	

Medium

Exposure

Exposure

Chemical





Carcinogenic Risk



Non-Carcinogenic Hazard Quotient







Medium

Point

of Potential



























Concern

Ingestion

Inhalation

Dermal

External

Exposure

Primary

Ingestion

Inhalation

Dermal

Exposure















(Radiation)

Routes Total

Taraet Oraan(s)







Routes Total

Surface/Subsurface Soil

Surface/Subsurface Soil

OWR

Benzo(a)pyrene

1.0E-08



4.2E-09



1.4E-08

Developmental, Immune, Reproductive

0.0024



0.00099

0.0034







Naphthalene











Nervous

0.000046



0.000019

0.000065







Dieldrin

7.1E-08



2.3E-08



9.4E-08

Hepatic

0.0031



0.0010

0.0041







Aluminum











Nervous

0.028



0.00090

0.029







Antimony











Hem atologic

0.046



0.0098

0.056







Arsenic

1.4E-07



2.3E-08



1.7E-07

Dermal, CVS

0.022



0.0036

0.026







Cobalt











Thyroid

0.0060



0.00019

0.0061







Copper











GS

0.047



0.0015

0.048







Iron











GS

0.077



0.0025

0.080







Lead











NA















Manganese











Nervous

0.046



0.037

0.082







Thallium











Dermal

0.15



0.0048

0.16







Vanadium







-



Urinary

0.0067



0.0082

0.015







Zinc







-



Hematologic

0.0036



0.00011

0.0037







Chemical Total

2.2E-07



5.0E-08

-

2.7E-07



0.44

-

0.070

0.51





Exposure Point Total



2.7E-07



0.51



Exposure Me

dium Total



2.7E-07



0.51



Air

OWR

Benzo(a)pyrene



3.5E-10





3.5E-10

Developmental, Reproductive

-

0.021



0.021







Naphthalene



1.1E-07





1.1E-07

Nervous, Respiratory

-

0.073



0.073







Dieldrin



1.2E-09





1.2E-09

NA















Aluminum











Nervous



0.32



0.32







Antimony











NA















Arsenic



4.0E-08





4.0E-08

NA



0.043



0.043







Cobalt



1.3E-07





1.3E-07

Respiratory



0.052



0.052







Copper











NA















Iron











NA















Lead











NA















Manganese











Nervous



1.3



1.3







Thallium











NA















Vanadium







-



Respiratory

-

0.038

-

0.038







Zinc







-



NA

-



-

-







Chemical Total

-

2.8E-07

-

-

2.8E-07





1.8



1.8





Exposure Point Total



2.8E-07



1.8



Exposure Me

dium Total



2.8E-07



1.8

Vledium Total



5.5E-07



2.3

Groundwater

Groundwater

OWR

2-Butanone



-



-



Developmental

5.1E-8

-

3.0E-8

8.1E-8







cis-1,2-Dichloroethene



-



-



Urinary

0.0000080

-

0.000052

0.000060







Methyl tert-butyl ether

1.3E-12



1.6E-12



2.9E-12

NA















Trichloroethene

9.1E-10



6.6E-09



7.5E-09

Immune, Developmental

0.0028



0.020

0.023







1,4-Dioxane

2.8E-10



5.6E-11



3.4E-10

Hepatic

0.00000039



7.9E-8

0.00000047







Caprolactam











Urinary

0.00000038



0.00000024

0.00000062







Aluminum











Nervous

0.0059



0.0033

0.0092







Antimony











Hem atologic

0.000059



0.00022

0.00028







Arsenic

6.6E-08



3.7E-08



1.0E-07

Dermal, CVS

0.010



0.0058

0.016







Barium











Urinary

0.00085



0.0069

0.0077







Beryllium











None Reported

0.00018



0.015

0.015







Cadmium











Urinary

0.000046



0.00052

0.00057







Cobalt











Thyroid

0.00021



0.000047

0.00026







Copper











GS

0.000051



0.000029

0.000080







Iron











GS

0.0055



0.0031

0.0086







Lead











NA















Manganese











Nervous

0.0022



0.031

0.033







Mercury











Nervous

0.0000023



0.000019

0.000021







Nickel











Body Weight

0.000041



0.00011

0.00016







Selenium











Body Weight

0.000016



0.0000093

0.000026







Thallium











Dermal

0.0030



0.0017

0.0046







Vanadium











Urinary

0.00016



0.0034

0.0036







Zinc







-



Hematologic

0.000059



0.000020

0.000079







Chemical Total

6.7E-08



4.4E-08

-

1.1E-07



0.031



0.09

0.12





Exposure Point Total





1.1E-07



0.12



Exposure Medium Total



1.1E-07



0.12


-------
TABLE 9.5.RME
SUMMARY OF RECEPTOR RISKS AND HAZARDS FOR COPCs
REASONABLE MAXIMUM EXPOSURES
OLD WILMINGTON ROAD SITE
PAGE 2 OF 2

Scenario Timeframe: Future

Receptor Population: Construction Workers

Receptor Age: Adult	

Medium

Exposure

Exposure

Chemical



Carcinogenic Risk



Non-Carcinogenic Hazard Quotient





Medium

Point

of Potential





















Concern

Ingestion

Inhalation

Dermal

External

Exposure

Primary

Ingestion

Inhalation

Dermal

Exposure















(Radiation)

Routes Total

Taraet Oraan(s)







Routes Total

Groundwater

Air

OWR

2-Butanone











Developmental

-

0.00026



0.00026







cis-1,2-Dichloroethene











NA















Methyl tert-butyl ether



7.8E-10





7.8E-10

Hepatic, Urinary, Ocular



0.000070



0.000070







Trichloroethene



3.1E-07





3.1E-07

Immune, Developmental



2.7



2.7







1,4-Dioxane



4.9E-09





4.9E-09

Respiratory



0.000095



0.000095







Caprolactam











Respiratory















Aluminum











Nervous















Antimony











NA















Arsenic











NA















Barium











Developmental















Beryllium











Immune, Respiratory















Cadmium











Urinary















Cobalt











Respiratory















Copper











NA















Iron











NA















Lead











NA















Manganese











Nervous















Mercury











Nervous















Nickel











Respiratory















Selenium











Respiratory















Thallium











NA















Vanadium











Respiratory















Zinc











NA

»

»

»

»







Chemical Total



3.2E-07



-

3.2E-07





2.7



2.7





Exposure Point Total





3.2E-07



2.7



Exposure Medium Total



3.2E-07



2.7

Vledium Total





4.3E-07



2.8

Receptor Total

Receptor Risk Total

9.9E-07

Receptor HI Total

5.1

Notes:

1 - Mutagenic chemicals were evaluated in accordance with USEPA's Supplemental Guidance for Assessing Susceptibility from Early-Life Exposure to Carcinogens (2005).

Total Body Weight HI
Total CVS HI
Total Dermal HI
Total Developmental HI
Total GS HI
Total Hematologic HI
Total Hepatic HI
Total Immune HI
Total Nervous HI
Total None Reported HI
Total Reproductive HI
Total Respiratory HI
Total Thyroid HI
Total Urinary HI
Total Ocular HI


-------
TABLE 9.6.RME

SUMMARY OF RECEPTOR RISKS AND HAZARDS FOR COPCs
REASONABLE MAXIMUM EXPOSURES
OLD WILMINGTON ROAD SITE
PAGE 1 OF 3

Scenario Timeframe: Future

Receptor Population: Industrial Worker

Receptor Age: Adult	

Medium

Exposure

Exposure

Chemical





Carcinogenic Risk



Non-Carcinogenic Hazard Quotient







Medium

Point

of Potential



























Concern

Ingestion

Inhalation

Dermal

External

Exposure

Primary

Ingestion

Inhalation

Dermal

Exposure















(Radiation)

Routes Total

Target Organ(s)







Routes Total

Surface/Subsurface Soil

Surface/Subsurface Soil

OWR

Benzo(a)pyrene

7.7E-08

-

4.2E-08

-

1.2E-07

Developmental, Immune, Reproductive

0.00072



0.00040

0.0011







Naphthalene











Body Weight

0.00042



0.00023

0.00065







Dieldrin

5.4E-07



2.3E-07



7.7E-07

Hepatic

0.0019



0.00080

0.0027







Aluminum











Nervous

0.009



0.00036

0.009







Antimony











Hematologic

0.014



0.0039

0.018







Arsenic

1.1E-06



2.3E-07



1.3E-06

Dermal, CVS

0.0068



0.0014

0.008







Cobalt











Thyroid

0.018



0.00076

0.019







Copper











GS

0.014



0.0006

0.015







Iron











GS

0.023



0.0010

0.024







Lead











NA















Manganese











Nervous

0.014



0.015

0.028







Thallium

--

-



-



Dermal

0.18



0.0077

0.19







Vanadium

--

-



-



Dermal

0.0040



0.0066

0.011







Zinc



-



-



Hematologic, Immune

0.0011

-

0.000046

0.0011







Chemical Total

1.7E-06

-

5.0E-07

-

2.2E-06



0.29

-

0.038

0.33





Exposure Point Total





2.2E-06



0.33



Exposure IV

edium Total



2.2E-06



0.33



Air

OWR

Benzo(a)pyrene



4E-12





4E-12

Developmental, Reproductive



0.000009

-

0.000009







Naphthalene



5E-07





5E-07

Nervous, Respiratory



0.013

-

0.013







Dieldrin



1E-11





1E-11

NA















Aluminum











Nervous



0.00014



0.00014







Antimony











NA



-











Arsenic



4E-10





4E-10

NA



0.000019



0.000019







Cobalt



1E-09





1E-09

Respiratory



0.000074



0.000074







Copper











NA















Iron











NA















Lead











NA















Manganese











Nervous



0.00055



0.00055







Thallium











NA















Vanadium











Respiratory



0.000017



0.000017







Zinc





-





NA















Chemical Total



4.6E-07

-

-

4.6E-07





0.013



0.013





Exposure Point Total





4.6E-07



0.013



Exposure Medium Total



4.6E-07



0.013

Vledium Total





2.7E-06



0.34


-------
TABLE 9.6.RME

SUMMARY OF RECEPTOR RISKS AND HAZARDS FOR COPCs
REASONABLE MAXIMUM EXPOSURES
OLD WILMINGTON ROAD SITE
PAGE 2 OF 3

Scenario Timeframe: Future

Receptor Population: Industrial Worker

Receptor Age: Adult	

Medium

Exposure

Exposure

Chemical





Carcinogenic Risk



Non-Carcinogenic Hazard Quotient







Medium

Point

of Potential

























Concern

Ingestion

Inhalation

Dermal

External
(Radiation)

Exposure
Routes Total

Primary
Target Organ(s)

Ingestion

Inhalation

Dermal

Exposure
Routes Total

Groundwater

Groundwater

OWR

2-Butanone
2-Hexanone

--

-



-



Developmental
Nervous

0.023
0.088



0.000039
0.00064

0.023
0.088







Chloroform

1.1E-06



1.2E-08



1.1E-06

Hepatic

0.010



0.00011

0.010







cis-1,2-Dichloroethene











Urinary

0.010



0.00015

0.010







Vlethyl Tert-Butyl Ether

1.0E-07



3.1E-10



1.0E-07

NA















Tetrachloroethene

5.3E-07



4.1E-08



5.7E-07

Nervous, Ocular

0.12



0.009

0.13







Trichloroethene

1.9E-06



3.8E-08



1.9E-06

Immune, Developmental

0.23



0.0047

0.23







Vinyl Chloride

1.6E-06



1.2E-08



1.6E-06

Hepatic

0.0020



0.000015

0.0020







1,4-Dioxane

1.5E-06



1.1E-09



1.5E-06

Hepatic, Urinary

0.0014



0.0000010

0.0014







Bis(2-ethylhexyl)phthalate

5.9E-07







5.9E-07

Hepatic

0.0059





0.0059







Caprolactam











Developmental

0.060



0.00016

0.060







Aluminum











Nervous

0.62



0.00044

0.62







Antimony











Hematologic

0.035



0.00016

0.035







Arsenic

7.3E-05



5.2E-08



7.3E-05

Dermal, CVS

0.46



0.00032

0.46







Barium











Urinary

0.036



0.00036

0.036







Beryllium











GS

0.019



0.0019

0.020







Cadmium











Urinary

0.0091



0.00013

0.0092







Cobalt











Thyroid

2.3



0.00064

2.3







Copper











GS

0.020



0.000014

0.020







Iron











GS

0.69



0.00049

0.69







Lead











NA















Vlanganese











Nervous

1.1



0.020

1.1







Vlercury











Immune, Urinary

0.0046



0.000046

0.0046







Mickel











Body Weight

0.028



0.000098

0.028







Selenium











Hematologic, Dermal, Nervous

0.0066



0.0000047

0.0066







Thallium

--

-



-



Dermal

0.58



0.00041

0.58







Vanadium

--

-



-



Dermal

0.026



0.00071

0.027







Zinc

--

-



-



Hematologic, Immune

0.013



0.0000057

0.013







Chemical Total

8.1E-05

-

1.6E-07

-

8.1E-05



6.5



0.040

6.5





Exposure Point Total



8.1E-05



6.5



Exposure Medium Total



8.1E-05



6.5


-------
TABLE 9.6.RME

SUMMARY OF RECEPTOR RISKS AND HAZARDS FOR COPCs
REASONABLE MAXIMUM EXPOSURES
OLD WILMINGTON ROAD SITE
PAGE 3 OF 3

Scenario Timeframe: Future

Receptor Population: Industrial Worker

Receptor Age: Adult	

Medium

Exposure

Exposure

Chemical



Carcinogenic Risk



Non-Carcinogenic Hazard Quotient







Medium

Point

of Potential

























Concern

Ingestion

Inhalation

Dermal

External

Exposure

Primary

Ingestion

Inhalation

Dermal

Exposure















(Radiation)

Routes Total

Target Organ(s)







Routes Total

Groundwater

Air

OWR

2-Butanone





-

-



Developmental, Musculosketal



0.0023



0.0023







2-Hexanone











Nervous



0.015



0.015







Chloroform



2.2E-06





2.2E-06

Hepatic



0.0028



0.0028







cis-1,2-Dichloroethene











NA















Vlethyl Tert-Butyl Ether



3.6E-08





3.6E-08

Hepatic, Urinary, Ocular



0.00013



0.00013







Tetrachloroethene



1.6E-07





1.6E-07

Nervous, Ocular



0.044



0.044







Trichloroethene



4.5E-07





4.5E-07

Immune, Developmental



0.15



0.15







Vinyl Chloride



3.4E-08





3.4E-08

Hepatic



0.00022



0.00022







1,4-Dioxane



5.9E-09





5.9E-09

Nervous, Respiratory



0.00011



0.00011







Bis(2-ethylhexyl)phthalate











NA















Caprolactam











Respiratory















Aluminum











Nervous















Antimony











NA















Arsenic











NA















Barium











Developmental















Beryllium











Immune, Respiratory















Cadmium











Urinary















Cobalt











Respiratory















Copper











NA















Iron











NA















Lead











NA















Vlanganese











Nervous















Vlercury











Nervous















Mickel











Respiratory















Selenium











Respiratory















Thallium





-

-



NA

»

»

»

»







Vanadium





-

-



Respiratory

-

-

-

-







Zinc





-

-



NA

-

-

-

-







Chemical Total



2.9E-06

-

-

2.9E-06





0.22



0.22





Exposure Point Total



2.9E-06



0.22



Exposure Medium Total



2.9E-06



0.22

Vledium Total





8.4E-05



6.7

Receptor Total



Recep

or Risk Total

8.6E-05

Receptor HI Total

7.1

Notes:

1 - Mutagenic chemicals were evaluated in accordance with USEPA's Supplemental Guidance for Assessing Susceptibility from Early-Life Exposure to Carcinogens (2005).

Total Body Weight HI

0.028

Total CVS HI

0.47

Total Dermal HI

1.3

Total Developmental HI

0.47

Total GS HI

0.77

Total Hematologic HI

0.074

Total Hepatic HI

0.025

Total Immune HI

0.41

Total Nervous HI

2.1

Total Respiratory HI

0.013

Total Thyroid HI

2.3

Total Urinary HI

0.062

Total Ocular HI

0.17

Total Reproductive HI

0.0011


-------
TABLE 9.7.RME

SUMMARY OF RECEPTOR RISKS AND HAZARDS FOR COPCs
REASONABLE MAXIMUM EXPOSURES
OLD WILMINGTON ROAD SITE
PAGE 1 OF 2

Scenario Timeframe: Future
Receptor Population: Residents
Receptor Age: Child

Medium

Exposure

Exposure

Chemical





Carcinogenic Risk



Non-Carcinogenic Hazard Quotient







Medium

Point

of Potential



























Concern

Ingestion

Inhalation

Dermal

External

Exposure

Primary

Ingestion

Inhalation

Dermal

Exposure















(Radiation)

RoutesTotal

Target Organ(s)







Routes Total

Surface/Subsurface Soil

Surface/Subsurface Soil

OWR

Benzo(a)pyrene

1.5E-06

-

4.5E-07

-

1.9E-06

Developmental, Immune, Reproductive

0.011

-

0.0033

0.014







Naphthalene



-







Body Weight

0.0063



0.0019

0.0082







Dieldrin

1.9E-06



4.6E-07



2.4E-06

Hepatic

0.028

-

0.0067

0.035







Aluminum



-







Nervous

0.13



0.0030

0.13







Antimony



-



-



Hematologic

0.21



0.033

0.24







Arsenic

3.9E-06

-

4.6E-07



4.4E-06

Dermal, CVS

0.10

-

0.012

0.11







Cobalt











Thyroid

0.27



0.0064

0.28







Copper











GS

0.21



0.0050

0.22







Iron



-







GS

0.35



0.0083

0.36







Lead



-







NA







-







Manganese



-







Nervous

0.21



0.12

0.33







Thallium











Dermal

2.7



0.065

2.8







Vanadium

--

-



-



Dermal

0.060

-

0.055

0.12







Zinc

--





-



Hematologic, Immune

0.016



0.00038

0.017







Chemical Total

7.3E-06



1.4E-06

-

8.7E-06



4.3



0.32

4.6





Exposure Point Total





8.7E-06



4.6



Exposure Medium Total



8.7E-06



4.6



Air

OWR

Benzo(a)pyrene



2.0E-11



-

2.0E-11

Developmental, Reproductive



0.000037

-

0.000037







Naphthalene

-

4.6E-07

-

-

4.6E-07

Nervous, Respiratory

-

0.053

-

0.053







Dieldrin



1.3E-11





1.3E-11

NA

-

-

-

-







Aluminum

-









Nervous



0.00059

-

0.00059







Antimony

-



-

-



NA

-

-

-

-







Arsenic

-

4.3E-10

-

-

4.3E-10

NA



0.000078

-

0.000078







Cobalt



1.4E-09





1.4E-09

Respiratory

-

0.00031

-

0.00031







Copper

-



-

-



NA

-

-

-

-







Iron

-





-



NA







-







Lead

-



-

-



NA

-

-

-

-







Manganese

-



-

-



Nervous



0.0023



0.0023







Thallium

-



-

-



NA

-

-

-

-







Vanadium

-



-

-



Respiratory

-

0.000070

-

0.000070







Zinc

-



-

-



NA

-

-

-

-







Chemical Total

-

4.6E-07

-

-

4.6E-07





0.056



0.056





Exposure Point Total



4.6E-07



0.056



Exposure Medium Total



4.6E-07



0.056

Medium Total



9.1E-06



4.7


-------
TABLE 9.7.RME

SUMMARY OF RECEPTOR RISKS AND HAZARDS FOR COPCs
REASONABLE MAXIMUM EXPOSURES
OLD WILMINGTON ROAD SITE
PAGE 2 OF 2

Scenario Timeframe: Future
Receptor Population: Residents
Receptor Age: Child

Medium

Exposure

Exposure

Chemical





Carcinogenic Risk



Non-Carcinogenic Hazard Quotient







Medium

Point

of Potential



























Concern

Ingestion

Inhalation

Dermal

External
(Radiation)

Exposure
RoutesTotal

Primary
Tarqet Orqan(s)

Ingestion

Inhalation

Dermal

Exposure
Routes Total

Groundwater

Groundwater

OWR

2-Butanone
2-Hexanone



"







Developmental
Nervous

0.11
0.41

"

0.00089
0.015

0.11
0.42







Chloroform

1.2E-06



9.9E-08



1.3E-06

Hepatic

0.047

-

0.0037

0.051







cis-1,2-Dichloroethene



-



-



Urinary

0.047



0.0052

0.052







Methyl Tert-Butyl Ether

1.2E-07

-

2.3E-09

-

1.2E-07

NA

-

-

-

-







Tetrachloroethene

5.9E-07

-

3.1E-07

-

9.0E-07

Nervous, Ocular

0.55

-

0.29

0.83







Trichloroethene (Mutagenic)

2.2E-06

-

3.3E-07

-

2.6E-06

NA

-

-

-

-







Trichloroethene (Nonmutagenic)

1.7E-06

-

2.4E-07



1.9E-06

Immune, Developmental

1.1

-

0.15

1.2







Vinyl Chloride

2.3E-05

-

1.6E-06

-

2.5E-05

Hepatic

0.0095

-

0.00064

0.010







1,4-Dioxane

1.6E-06

-

5.2E-09

-

1.6E-06

Hepatic, Urinary

0.0064

-

0.000020

0.0064







Bis(2-ethylh exy I )phthalate

6.6E-07

-



-

6.6E-07

Hepatic

0.027

-

-

0.027







Caprolactam



-







Developmental

0.28



0.0031

0.28







Aluminum



-







Nervous

2.9



0.013

2.9







Antimony



-



-



Hematologic

0.16



0.0048

0.17







Arsenic

8.2E-05

-

3.6E-07



8.2E-05

Dermal, CVS

2.1

-

0.0094

2.1







Barium



-



-



Urinary

0.17

-

0.011

0.18







Beryllium



-



-



GS

0.086

-

0.054

0.14







Cadmium



-



-



Urinary

0.042

-

0.0037

0.046







Cobalt



-



-



Thyroid

10.6

-

0.019

11







Copper



-



-



GS

0.094

-

0.000413

0.094







Iron



-



-



GS

3.2

-

0.014

3.2







Lead



-



-



NA

-

-

-

-







Manganese



-



-



Nervous

5.2

-

0.58

5.8







Mercury



-



-



Immune, Urinary

0.021

-

0.0013

0.023







Nickel



-



-



Body Weight

0.13

-

0.0028

0.13







Selenium



-



-



Hematologic, Dermal, Nervous

0.031

-

0.00014

0.031







Thallium



-



-



Dermal

2.7

-

0.012

2.7







Vanadium

--

-



-



Dermal

0.12

-

0.021

0.14







Zinc

--

-



-



Hematologic, Immune

0.063

-

0.00017

0.063







Chemical Total

1.1E-04

-

2.9E-06

-

1.2E-04



30.2

-

1.2

31





Exposure Point Total





1.2E-04



31



Exposure to

edium Total



1.2E-04



31

Medium Total





1.2E-04



31

Sediment

Sediment

OWR

Cobalt

--

-



-



Thyroid

0.09

-

0.002

0.09







Nickel

--

-



-



Body Weight

0.14

-

0.085

0.23







Chemical Total



-



-





0.23

-

0.09

0.32





Exposure Point Total







0.32



Exposure to

edium Total







0.32

Medium Total









0.32

Receptor Total

Receptor Risk Total

1.3E-04

Receptor HI Total

36

Notes:

1 - Mutagenic chemicals were evaluated in accordance with USEPA's Supplemental Guidance for Assessing Susceptibility from Early-Life Exposure to Carcinogens (2005).

Total Body Weight HI
Total CVS HI
Total Dermal HI
Total Developmental HI
Total GS HI
Total Hematologic HI
Total Hepatic HI
Total Immune HI
Total Nervous HI
Total Respiratory HI
Total Thyroid HI
Total Urinary HI
Total Ocular HI
Total Reproductive HI


-------
TABLE 9.8.RME

SUMMARY OF RECEPTOR RISKS AND HAZARDS FOR COPCs
REASONABLE MAXIMUM EXPOSURES
OLD WILMINGTON ROAD SITE
PAGE 1 OF 3

Medium

Exposure

Exposure

Chemical





Carcinogenic Risk



Non-Carcinogenic Hazard Quotient







Medium

Point

of Potential



























Concern

Ingestion

Inhalation

Dermal

External

Exposure

Primary

Ingestion

Inhalation

Dermal

Exposure















(Radiation)

Routes Total

Target Organ(s)







Routes Total

Surface/Subsurface Soil

Surface/Subsurface Soil

OWR

Benzo(a)pyrene

1.7E-07

-

9.5E-08

-

2.7E-07

Developmental, Immune, Reproductive

0.0010



0.00055

0.0016







Naphthalene



-



-



Body Weight

0.00059



0.00032

0.00091







Dieldrin

6.0E-07

-

2.5E-07

-

8.6E-07

Hepatic

0.0026

-

0.0011

0.0038







Aluminum











Nervous

0.012



0.00050

0.012







Antimony



-



-



Hematologic

0.019



0.0055

0.025







Arsenic

1.2E-06

-

2.6E-07



1.5E-06

Dermal, CVS

0.0095

-

0.0020

0.011







Cobalt



-



-



Thyroid

0.025

-

0.0011

0.026







Copper











GS

0.020



0.00084

0.021







Iron











GS

0.033



0.0014

0.034







Lead



-



-



NA

-

-

-

-







Manganese



-



-



Nervous

0.019



0.020

0.040







Thallium



-



-



Dermal

0.26

-

0.011

0.27







Vanadium











Dermal

0.0057



0.0092

0.015







Zinc











Hematologic, Immune

0.0015

-

0.000064

0.0016







Chemical Total

2.0E-06

-

6.1E-07



2.6E-06



0.40



0.054

0.46





Exposure Point Total





2.6E-06



0.46



Exposure Medium Total



2.6E-06



0.46



Air

OWR

Benzo(a)pyrene



2.6E-11





3E-11

Developmental, Reproductive



0.000037

-

0.000037







Naphthalene

-

1.5E-06

-

-

2E-06

Nervous, Respiratory

-

0.053

-

0.053







Dieldrin



4.3E-11

-

-

4E-11

NA

-

-

-

-







Aluminum

-



-

-



Nervous



0.00059

-

0.00059







Antimony

-



-

-



NA

-

-

-

-







Arsenic

-

1.4E-09

-



1E-09

NA

-

0.000078

-

0.000078







Cobalt

-

4.8E-09

-

-

5E-09

Respiratory

-

0.00031

-

0.00031







Copper

-



-

-



NA

-

-

-

-







Iron

-



-

-



NA

-

-

-









Lead

-



-

-



NA

-

-

-

-







Manganese

-



-

-



Nervous



0.0023

-

0.0023







Thallium

-



-

-



NA

-

-

-

-







Vanadium

-



-

-



Respiratory

-

0.000070

-

0.000070







Zinc

-



-

-



NA

-

-

-









Chemical Total

-

1.5E-06

-

-

1.5E-06





0.056



0.056





Exposure Point Total



1.5E-06



0.056



Exposure Medium Total



1.5E-06



0.056

Medium Total



4.1E-06



0.51

(Scenario timeframe: Future
eceptor Population: Residents
eceptorAqe: Adult


-------
TABLE 9.8.RME

SUMMARY OF RECEPTOR RISKS AND HAZARDS FOR COPCs
REASONABLE MAXIMUM EXPOSURES
OLD WILMINGTON ROAD SITE
PAGE 2 OF 3

Medium

Exposure

Exposure

Chemical





Carcinogenic Risk



Non-Carcinogenic Hazard Quotient







Medium

Point

of Potential



























Concern

Ingestion

Inhalation

Dermal

External

Exposure

Primary

Ingestion

Inhalation

Dermal

Exposure















(Radiation)

Routes Total

Target Organ(s)







Routes Total

Groundwater

Groundwater

OWR

2-Butanone



-



-



Developmental

0.065

-

0.00054

0.065







2-Hexanone



-



-



Nervous

0.25



0.0084

0.25







Chloroform

2.5E-06

-

1.3E-07

-

2.6E-06

Hepatic

0.028

-

0.0015

0.030







cis-1,2-Dichloroethene



-



-



Urinary

0.028

-

0.0019

0.030







Methyl Tert-Butyl Ether

2.3E-07

-

3.3E-09

-

2.3E-07

NA

-

-

-









Tetrachloroethene

1.2E-06

-

4.3E-07

-

1.6E-06

Nervous, Ocular

0.33

-

0.12

0.45







Trichloroethene (Mutagenic)

1.7E-06

-

1.6E-07

-

1.9E-06

NA

-

-

-

-







Trichloroethene (Nonmutagenic)

3.4E-06

-

3.2E-07

-

3.7E-06

Immune, Developmental

0.64

-

0.06

0.70







Vinyl Chloride

3.5E-06

-

1.3E-07

-

3.6E-06

Hepatic

0.0057

-

0.00021

0.0059







1,4-Dioxane

3.3E-06

-

1.1E-08

-

3.3E-06

Hepatic, Urinary

0.0038



0.000013

0.0038







Bis(2-ethylh exy I )phthalate

1.3E-06

-



-

1.3E-06

Hepatic

0.016

-

-

0.016







Caprolactam



-



-



Developmental

0.17

-

0.0021

0.17







Aluminum



-



-



Nervous

1.7

-

0.0096

1.7







Antimony



-



-



Hematologic

0.098



0.0037

0.10







Arsenic

1.6E-04

-

9.2E-07

-

1.7E-04

Dermal, CVS

1.3

-

0.0071

1.3







Barium



-



-



Urinary

0.10

-

0.0081

0.11







Beryllium



-



-



GS

0.052

-

0.041

0.093







Cadmium



-



-



Urinary

0.025

-

0.0028

0.028







Cobalt



-



-



Thyroid

6.4



0.014

6.4







Copper











GS

0.056



0.00031

0.057







Iron



-



-



GS

1.9



0.011

2.0







Lead



-



-



NA

-

-

-

-







Manganese











Nervous

3.2



0.44

3.6







Mercury











Immune, Urinary

0.013



0.0010

0.014







Nickel



-



-



Body Weight

0.077



0.0022

0.080







Selenium



-



-



Hematologic, Dermal, Nervous

0.019



0.00010

0.019







Thallium



-



-



Dermal

1.6

-

0.0090

1.6







Vanadium



-



-



Dermal

0.074

-

0.016

0.090







Zinc











Hematologic, Immune

0.038



0.00013

0.038







Chemical Total

1.8E-04

-

2.1E-06

-

1.8E-04



18

-

0.8

19





Exposure Point Total





1.8E-04



19



Exposure K

edium Total



1.8E-04



19

(Scenario timeframe: Future
eceptor Population: Residents
eceptorAqe: Adult


-------
TABLE 9.8.RME

SUMMARY OF RECEPTOR RISKS AND HAZARDS FOR COPCs
REASONABLE MAXIMUM EXPOSURES
OLD WILMINGTON ROAD SITE
PAGE 3 OF 3

Medium

Exposure

Exposure

Chemical





Carcinogenic Risk



Non-Carcinogenic Hazard Quotient







Medium

Point

of Potential



























Concern

Ingestion

Inhalation

Dermal

External
(Radiation)

Exposure
Routes Total

Primary
Target Organ(s)

Ingestion

Inhalation

Dermal

Exposure
Routes Total

Groundwater

Air

OWR

2-Butanone

2-Hexanone

Chloroform

cis-1,2-Dichloroethene

Methyl Tert-Butyl Ether

Tetrachloroethene

Trichloroethene (Mutagenic)

Trichloroethene (Nonmutagenic)

Vinyl Chloride

1,4-Dioxane

Bis(2-ethylhexyl)phthalate

Caprolactam

Aluminum

Antimony

Arsenic

Barium

Beryllium

Cadmium

Cobalt

Copper

Iron

Lead

Manganese

Mercury

Nickel

Selenium

Thallium

Vanadium

Zinc

-

3.3E-05

5.3E-07
2.4E-06
3.2E-06
4.9E-06
5.0E-07
8.6E-08

-

"

3.3E-05

5.3E-07
2.4E-06
3.2E-06
4.9E-06
5.0E-07
8.6E-08

Developmental, Musculosketal
Nervous
Hepatic
NA

Hepatic, Urinary, Ocular

Nervous, Ocular
NA

Hepatic, Urinary
Hepatic
Nervous, Respiratory
NA
Respiratory
Nervous
NA
NA

Developmental
Immune, Respiratory
Urinary
Respiratory
NA
NA
NA
Nervous
Nervous
Respiratory
Respiratory

NA
Respiratory
NA

"

0.042
0.27
0.051

0.0024
0.79

2.8
0.0040
0.0020

"

0.042
0.27
0.051

0.0024
0.79

2.8
0.0040
0.0020







Chemical Total



4.4E-05





4.4E-05





3.9



3.9





Exposure Point Total



4.4E-05



3.9



Exposure Medium Total



4.4E-05



3.9

Medium Total



2.3E-04



23

Sediment

Sediment

OWR

Cobalt











Thyroid

0.008



0.000

0.009







Nickel



-



-



Body Weight

0.013

-

0.014

0.027





IjChemical Total



-



-





0.022

-

0.014

0.036





Exposure Point Total







0.036



Exposure Medium Total







0.036

Medium Total







0.036

Receptor Total











Receptor Risk Total

2.3E-04

Receptor HI Total

23

Notes:

1 - Mutagenic chemicals were evaluated in accordance with USEPA's Supplemental Guidance for Assessing Susceptibility from Early-Life Exposure to Carcinogens (2005).	Total Body Weight HI 	0.11

Total CVS HI	1.3

Total Dermal HI	3.3

Total Developmental HI	1.0

Total GS HI	2.2

Total Hematologic HI	0.18

Total Hepatic HI	2.9

Total Immune HI	0.75

Total Nervous HI	7.2

Total Respiratory HI	0.055

Total Thyroid HI	6.4

Total Urinary HI	3.0

Total Ocular HI	1.2

(Scenario Timeframe: Future
eceptor Population: Residents
eceptorAqe: Adult


-------
TABLE 9.9.RME

SUMMARY OF RECEPTOR RISKS AND HAZARDS FOR COPCs
REASONABLE MAXIMUM EXPOSURES
OLD WILMINGTON ROAD SITE
PAGE 1 OF 3

Scenario Timeframe: Future
Receptor Population: Residents
Receptor Age: Lifelong (Child and Adult)

Medium

Exposure
Medium

Exposure
Point

Chemical
of Potential
Concern

Carcinogenic Risk

Non-Carcinogenic Hazard Quotient

Ingestion

Inhalation

Dermal

External
(Radiation)

Exposure
Routes Total

Primary
Target Organ(s)

Ingestion

Inhalation

Dermal

Exposure
Routes Total

Surface/Subsurface Soil

Surface/Subsurface Soil

OWR

Benzo(a)pyrene

Naphthalene

Dieldrin

Aluminum

Antimony

Arsenic

Cobalt

Copper

Iron

Lead

Manganese
Thallium
Vanadium
Zinc

1.6E-06
2.5E-06

5.1E-06

"

5.5E-07
7.1E-07

7.2E-07

"

2.2E-06
3.2E-06

5.8E-06











Chemical Total

9.3E-06

-

2.0E-06

-

1.1E-05











Exposure Point Total



1.1E-05





Exposure Medium Total



1.1E-05





Air

OWR

Benzo(a)pyrene

Naphthalene

Dieldrin

Aluminum

Antimony

Arsenic

Cobalt

Copper

Iron

Lead

Manganese
Thallium
Vanadium
Zinc

-

4.6E-11
2.0E-06
5.6E-11

1.9E-09
6.3E-09

-

-

5E-11
2E-06
6E-11

2E-09
6E-09











Chemical Total

-

2.0E-06

-

-

2.0E-06











Exposure Point Total



2.0E-06





Exposure Medium Total



2.0E-06





Medium Total



1.3E-05






-------
TABLE 9.9.RME

SUMMARY OF RECEPTOR RISKS AND HAZARDS FOR COPCs
REASONABLE MAXIMUM EXPOSURES
OLD WILMINGTON ROAD SITE
PAGE 2 OF 3

Scenario Timeframe: Future
Receptor Population: Residents
Receptor Age: Lifelong (Child and Adult)

Exposure
Medium

Exposure
Point

Chemical
of Potential
Concern

Carcinogenic Risk

External
(Radiation)

Exposure
Routes Total

Non-Carcinogenic Hazard Quotient

Primary
Target Organ(s)

Exposure Point Total

Expt

2-Butanone
2-Hexanone
Chloroform
cis-1,2-Dichloroethene
Methyl Tert-Butyl Ether
Tetrachloroethene
Trichloroethene (Mutagenic)
Trichloroethene (Nonmutagenic)
Vinyl Chloride
1,4-Dioxane

Bis(2-ethylh exy I )phthalate
Caprolactam
Aluminum
Antimony
Arsenic
Barium
Beryllium
Cadmium
Cobalt
Copper
Iron
Lead

Manganese
Mercury
Nickel
Selenium
Thallium
Vanadium

Zinc	

3.5E-07
1.8E-06
3.9E-06
5.0E-06
2.7E-05
4.9E-06
2.0E-06

5.6E-09
7.4E-07
4.9E-07
5.7E-07
1.7E-06
1.6E-08

Chemical Total

3.5E-07
2.5E-06
4.4E-06
5.6E-06
2.8E-05
4.9E-06
2.0E-06

'Osure Medium Total

Exposure
Routes Total


-------
TABLE 9.9.RME

SUMMARY OF RECEPTOR RISKS AND HAZARDS FOR COPCs
REASONABLE MAXIMUM EXPOSURES
OLD WILMINGTON ROAD SITE
PAGE 3 OF 3

Scenario Timeframe: Future
Receptor Population: Residents
Receptor Age: Lifelong (Child and Adult)

Medium

Exposure

Exposure

Chemical





Carcinogenic Risk





Non-Carcinogenic Hazard Quotient







Medium

Point

of Potential





























Concern

Ingestion

Inhalation

Dermal

External
(Radiation)

Exposure
Routes Total

Primary
Target Orqan(s)



Ingestion

Inhalation

Dermal

Exposure
Routes Total

Groundwater

Air

OWR

2-Butanone

2-Hexanone

Chloroform

cis-1,2-Dichloroethene

Methyl Tert-Butyl Ether

Tetrachloroethene

Trichloroethene (Mutagenic)

Trichloroethene (Nonmutagenic)

Vinyl Chloride

1,4-Dioxane

Bis(2-ethylh exy I )phthalate

Caprolactam

Aluminum

Antimony

Arsenic

Barium

Beryllium

Cadmium

Cobalt

Copper

Iron

Lead

Manganese

Mercury

Nickel

Selenium

Thallium

Vanadium

Zinc

"

3.3E-05

5.3E-07
2.4E-06
3.2E-06
4.9E-06
5.0E-07
8.6E-08

"

"

3.3E-05

5.3E-07
2.4E-06
3.2E-06
4.9E-06
5.0E-07
8.6E-08



















Chemical Total

-

4.4E-05

-

-

4.4E-05

















Exposure Point Total



4.4E-05







Exposure Medium Total



4.4E-05





Medium Total



3.4E-04





Sediment

Sediment

OWR

Cobalt
Nickel





























Chemical Total



-



-



















Exposure Point Total











Exposure Medium Total









Medium Total









Receptor Total











Receptor Risk Total

3.6E-04





Notes:

1 - Mutagenic chemicals were evaluated in accordance with USEPA's Supplemental Guidance for Assessing Susceptibility from Early-Life Exposure to Carcinogens (2005).


-------
TABLE 9.1.CTE

SUMMARY OF RECEPTOR RISKS AND HAZARDS FOR COPCs
CENTRAL TENDENCY EXPOSURES
OLD WILMINGTON ROAD SITE

		PAGE 1 OF 1

Scenario Timeframe: Current

Receptor Population: Industrial Workers

Receptor Age: Adult	

Medium

Exposure

Exposure

Chemical





Carcinogenic Risk



Non-Carcinogenic Hazard Quotient







Medium

Point

of Potential



























Concern

Ingestion

Inhalation

Dermal

External

Exposure

Primary

Ingestion

Inhalation

Dermal

Exposure















(Radiation)

Routes Total

Target Organ(s)







Routes Total

Surface Soil

Surface Soil

OWR

Benzo(a)pyrene

1.1E-08

-

2.0E-09

-

1.3E-08

Developmental, Immune, Reproductive

0.00036



0.000066

0.00042







Naphthalene











Body Weight

0.00018



0.000034

0.00022







Dieldrin

6.6E-08



9.3E-09



7.5E-08

Hepatic

0.00083



0.00012

0.00094







Aluminum











Nervous

0.0045



0.000063

0.0046







Antimony











Hematologic

0.011



0.00100

0.012







Arsenic

1.8E-07



1.3E-08



1.9E-07

Dermal, CVS

0.0040



0.00028

0.0042







Cobalt











Thyroid

0.0095



0.00013

0.0096







Copper











GS

0.012



0.00016

0.012







Iron











GS

0.011



0.00015

0.011







Lead











NA















Vlanganese











Nervous

0.0071



0.0025

0.0096







Vanadium

--

-



-



Dermal

0.0020

»

0.0011

0.0031







Zinc

--

-



-



Hematologic, Immune

0.00088

-

0.000012

0.00089







Chemical Total

2.5E-07

-

2.4E-08

-

2.8E-07



0.062

-

0.0056

0.068





Exposure Point Total



2.8E-07



0.068



Exposure Medium Total



2.8E-07



0.068



Air

OWR

Benzo(a)pyrene



1.1E-12

-

-

1.1E-12

Developmental, Reproductive



0.0000088



0.0000088







Naphthalene



1.1E-07





1.1E-07

Nervous, Respiratory



0.011



0.011







Dieldrin



3.1E-12





3.1E-12

NA

-













Aluminum











Nervous



0.00015



0.00015







Antimony











NA















Arsenic



1.4E-10





1.4E-10

NA



0.000022



0.000022







Cobalt



4.2E-10





4.2E-10

Respiratory



0.000078



0.000078







Copper











NA



-











Iron











NA















Lead











NA















Vlanganese











Nervous



0.00056



0.00056







Vanadium

-



-

-



Respiratory



0.000017

»

0.000017







Zinc

-



-

-



NA





-

-







Chemical Total

-

1.1E-07

-

-

1.1E-07





0.012



0.012





Exposure Point Total





1.1E-07



0.012



Exposure Medium Total



1.1E-07



0.012

Vledium Total





3.9E-07



0.080

Receptor Total

Receptor Risk Total

3.9E-07

Receptor HI Total

0.080

Notes:

1 - Mutagenic chemicals were evaluated in accordance with USEPA's Supplemental Guidance for Assessing Susceptibility from Early-Life Exposure to Carcinogens (2005).


-------
TABLE 9.2.CTE

SUMMARY OF RECEPTOR RISKS AND HAZARDS FOR COPCs
CENTRAL TENDENCY EXPOSURES
OLD WILMINGTON ROAD SITE

		PAGE 1 OF 1

Scenario Timeframe: Current
Receptor Population: Residents

Receptor Age: Child	

Medium

Exposure

Exposure

Chemical





Carcinogenic Risk



Non-Carcinogenic Hazard Quotient







Medium

Point

of Potential



























Concern

Ingestion

Inhalation

Dermal

External

Exposure

Primary

Ingestion

Inhalation

Dermal

Exposure















(Radiation)

Routes Total

Target Organ(s)







Routes Total

Surface Soil

Surface Soil

OWR

Benzo(a)pyrene

2.3E-07

-

2.8E-08

-

2.6E-07

Developmental, Immune, Reproductive

0.0041



0.00050

0.0046







Naphthalene











Body Weight

0.0021



0.00026

0.0024







Dieldrin

2.1E-07



2.0E-08



2.4E-07

Hepatic

0.0094



0.00089

0.010







Aluminum











Nervous

0.051



0.00049

0.052







Antimony











Hematologic

0.12



0.0076

0.13







Arsenic

5.8E-07



2.8E-08



6.1E-07

Dermal, CVS

0.045



0.0021

0.047







Cobalt











Thyroid

0.11



0.0010

0.11







Copper











GS

0.13



0.0013

0.13







Iron











GS

0.12



0.0012

0.12







Lead











NA















Vlanganese











Nervous

0.081



0.019

0.10







Vanadium

--

-



-



Dermal

0.023

»

0.0084

0.032







Zinc

--

-



-



Hematologic, Immune

0.010

-

0.000095

0.010







Chemical Total

1.0E-06

-

7.6E-08

-

1.1E-06



0.71

-

0.043

0.75





Exposure Point Total



1.1E-06



0.75



Exposure Medium Total



1.1E-06



0.75



Air

OWR

Benzo(a)pyrene



6.3E-12

-

-

6.3E-12

Developmental, Reproductive



0.000028



0.000028







Naphthalene



1.0E-07





1.0E-07

Nervous, Respiratory



0.035



0.035







Dieldrin



2.9E-12





2.9E-12

NA















Aluminum











Nervous



0.00047



0.00047







Antimony











NA















Arsenic



1.3E-10





1.3E-10

NA



0.000070



0.000070







Cobalt



3.9E-10





3.9E-10

Respiratory



0.00025



0.00025







Copper











NA















Iron











NA















Lead











NA















Manganese











Nervous



0.0018



0.0018







Vanadium





-

-



Respiratory



0.000053

»

0.000053







Zinc





-

-



NA





-

-







Chemical Total



1.0E-07

-

-

1.0E-07





0.038



0.038





Exposure Point Total





1.0E-07



0.038



Exposure Medium Total



1.0E-07



0.038

Vledium Total





1.2E-06



0.79

Sediment

Sediment

OWR

Cobalt

--

-



-



Thyroid

0.022



0.000

0.022







Nickel

--

-



-



Body Weight

0.036



0.0085

0.044





|chemical Total

--

-



-





0.058



0.009

0.07





Exposure Point Total







0.07

EE Exposure Medium Total









0.07

Vledium Total







0.07

Receptor Total





Recep

or Risk Total

1.2E-06

Receptor HI Total

0.86

Notes:

1 - Mutagenic chemicals were evaluated in accordance with USEPA's Supplemental Guidance for Assessing Susceptibility from Early-Life Exposure to Carcinogens (2005).


-------
TABLE 9.3.CTE

SUMMARY OF RECEPTOR RISKS AND HAZARDS FOR COPCs
CENTRAL TENDENCY EXPOSURES
OLD WILMINGTON ROAD SITE
PAGE 1 OF 1

Scenario Timeframe: Current
Receptor Population: Residents

Receptor Age: Adult	

Medium

Exposure

Exposure

Chemical





Carcinogenic Risk



Non-Carcinogenic Hazard Quotient







Medium

Point

of Potential



























Concern

Ingestion

Inhalation

Dermal

External

Exposure

Primary

Ingestion

Inhalation

Dermal

Exposure















(Radiation)

Routes Total

Target Organ(s)







Routes Total

Surface Soil

Surface Soil

OWR

Benzo(a)pyrene

1.8E-08



2.8E-09



2.1E-08

Developmental, Immune, Reproductive

0.00038



0.000060

0.00044







Naphthalene











Body Weight

0.00020



0.000031

0.00023







Dieldrin

7.1E-08



8.5E-09



7.9E-08

Hepatic

0.00088



0.00011

0.00099







Aluminum











Nervous

0.0048



0.000058

0.0049







Antimony











Hematologic

0.011



0.00091

0.012







Arsenic

1.9E-07



1.1E-08



2.0E-07

Dermal, CVS

0.0042



0.00026

0.0045







Cobalt











Thyroid

0.010



0.00012

0.010







Copper











GS

0.012



0.00015

0.013







Iron











GS

0.012



0.00014

0.012







Lead











NA















Manganese











Nervous

0.0076



0.0023

0.0099







Vanadium











Dermal

0.0022

-

0.0010

0.0032







Zinc







-



Hematologic, Immune

0.00094

-

0.000011

0.00095







Chemical Total

2.8E-07



2.3E-08

-

3.0E-07



0.067

-

0.0051

0.072





Exposure Point Total



3.0E-07



0.072



Exposure Medium Total



3.0E-07



0.072



Air

OWR

Benzo(a)pyrene



5.3E-12





5.3E-12

Developmental, Reproductive

-

0.000028



0.000028







Naphthalene



3.6E-07





3.6E-07

Nervous, Respiratory



0.035



0.035







Dieldrin



1.0E-11





1.0E-11

NA















Aluminum











Nervous



0.00047



0.00047







Antimony











NA















Arsenic



4.5E-10





4.5E-10

NA



0.000070



0.000070







Cobalt



1.4E-09





1.4E-09

Respiratory

-

0.00025



0.00025







Copper











NA















Iron











NA















Lead











NA















Manganese











Nervous



0.0018



0.0018







Vanadium











Respiratory

»

0.000053

»

0.000053







Zinc











NA

-

-

-

-







Chemical Total



3.6E-07





3.6E-07





0.038



0.038





Exposure Point Total



3.6E-07



0.038



Exposure Medium Total



3.6E-07



0.038

Vledium Total





6.6E-07



0.11

Sediment

Sediment

OWR

Cobalt











Thyroid

0.0021

-

0.0000

0.0021







Nickel











Body Weight

0.0033

-

0.0010

0.0043







Chemical Total













0.0054

-

0.0010

0.006





Exposure Point Total







0.006



Exposure Medium Total







0.006

Vledium Total







0.006

Receptor Total

Receptor Risk Total

6.6E-07

ReceptorHI Total

0.12

Notes:

1 - Mutagenic chemicals were evaluated in accordance with USEPA's Supplemental Guidance for Assessing Susceptibility from Early-Life Exposure to Carcinogens (2005).


-------
TABLE 9.4.CTE

SUMMARY OF RECEPTOR RISKS AND HAZARDS FOR COPCs
CENTRAL TENDENCY EXPOSURES
OLD WILMINGTON ROAD SITE

		PAGE 1 OF 1

Scenario Timeframe: Current
Receptor Population: Residents

Receptor Age: Lifelong (Child and Adult)	

Medium

Exposure
Medium

Exposure
Point

Chemical
of Potential
Concern

Carcinogenic Risk

Non-Carcinogenic Hazard Quotient

Ingestion

Inhalation

Dermal

External
(Radiation)

Exposure
Routes Total

Primary
Target Organ(s)

Ingestion

Inhalation

Dermal

Exposure
Routes Total

Surface Soil

Surface Soil

OWR

Benzo(a)pyrene

Naphthalene

Dieldrin

Aluminum

Antimony

Arsenic

Cobalt

Copper

Iron

Lead

Manganese

Vanadium

Zinc

2.5E-07
2.9E-07

7.7E-07



3.1E-08
2.9E-08

3.9E-08



2.8E-07
3.1E-07

8.1E-07



See Tables 9.2.CTE and 9.3.CTE for Hazard Indices









Chemical Total

1.3E-06



9.9E-08

--

1.4E-06











Exposure Point Total



1.4E-06





Exposure Medium Total



1.4E-06





Air

OWR

Benzo(a)pyrene

Naphthalene

Dieldrin

Aluminum

Antimony

Arsenic

Cobalt

Copper

Iron

Lead

Manganese

Vanadium

Zinc



1.2E-11
4.6E-07
1.3E-11

5.8E-10
1.7E-09





1.2E-11
4.6E-07
1.3E-11

5.8E-10
1.7E-09











Chemical Total



4.6E-07





4.6E-07











Exposure Point Total



4.6E-07





Exposure Medium Total



4.6E-07





Vledium Total





1.9E-06





Sediment

Sediment

OWR

Cobalt
Nickel























Chemical Total





















Exposure Point Total









Exposure Medium Total









Vledium Total









Receptor Total

Receptor Risk Total

1.9E-06





Notes:

1 - Mutagenic chemicals were evaluated in accordance with USEPA's Supplemental Guidance for Assessing Susceptibility from Early-Life Exposure to Carcinogens (2005).


-------
TABLE 9.5.CTE

SUMMARY OF RECEPTOR RISKS AND HAZARDS FOR COPCs
CENTRAL TENDENCY EXPOSURES
OLD WILMINGTON ROAD SITE

		PAGE 1 OF 3

Scenario Timeframe: Future

Receptor Population: Construction Workers

Receptor Age: Adult	

Medium

Exposure

Exposure

Chemical





Carcinogenic Risk



Non-Carcinogenic Hazard Quotient







Medium

Point

of Potential



























Concern

Ingestion

Inhalation

Dermal

External

Exposure

Primary

Ingestion

Inhalation

Dermal

Exposure















(Radiation)

Routes Total

Target Orqan(s)







Routes Total

Surface/Subsurface Soil

Surface/Subsurface Soil

OWR

Benzo(a)pyrene

2.5E-09

-

7.1E-10



3.2E-09

Developmental, Immune, Reproductive

0.00059

-

0.00016

0.00076







Naphthalene











Nervous

0.000012



0.0000032

0.000015







Dieldrin

1.8E-08



3.8E-09



2.2E-08

Hepatic

0.00078



0.00017

0.00094







Aluminum











Nervous

0.0070



0.00015

0.0072







Antimony











Hematologic

0.011



0.0016

0.013







Arsenic

3.6E-08



3.8E-09



4.0E-08

Dermal, CVS

0.0056



0.00060

0.0062







Cobalt











Thyroid

0.0015



0.000032

0.0015







Copper











GS

0.012



0.00025

0.012







Iron











GS

0.019



0.00041

0.020







Lead











NA

-













Manganese











Nervous

0.011



0.0061

0.018







Thallium



-

--

-



Dermal

0.038

-

0.00080

0.038







Vanadium



-

--

-



Urinary

0.0017

-

0.0014

0.0030







Zinc



-



-



Hematologic

0.00089

-

0.000019

0.00091







Chemical Total

5.6E-08

-

8.3E-09

-

6.5E-08



0.11

-

0.012

0.12





Exposure Point Total





6.5E-08



0.12



Exposure IV

edium Total



6.5E-08



0.12



Air

OWR

Benzo(a)pyrene



1.8E-10





1.8E-10

Developmental, Reproductive

-

0.010



0.010







Naphthalene



5.3E-08





5.3E-08

Nervous, Respiratory

-

0.036



0.036







Dieldrin



5.9E-10





5.9E-10

NA

-













Aluminum











Nervous

-

0.16



0.16







Antimony











NA

-













Arsenic



2.0E-08





2.0E-08

NA

-

0.021



0.021







Cobalt



6.6E-08





6.6E-08

Respiratory

-

0.026



0.026







Copper











NA

-













Iron











NA

-













Lead







-



NA

-

-











Manganese











Nervous

-

0.63



0.63







Thallium







-



NA

-

-











Vanadium











Respiratory

-

0.019



0.019







Zinc





-





NA

-

-

-

-







Chemical Total



1.4E-07

-

-

1.4E-07





0.91



0.91





Exposure Point Total





1.4E-07



0.91



Exposure Medium Total



1.4E-07



0.91

Vledium Total





2.0E-07



1.0


-------
TABLE 9.5.CTE

SUMMARY OF RECEPTOR RISKS AND HAZARDS FOR COPCs
CENTRAL TENDENCY EXPOSURES
OLD WILMINGTON ROAD SITE

		PAGE 2 OF 3

Scenario Timeframe: Future

Receptor Population: Construction Workers

Receptor Age: Adult	

Medium

Exposure

Exposure

Chemical



Carcinogenic Risk



Non-Carcinogenic Hazard Quotient







Medium

Point

of Potential

























Concern

Ingestion

Inhalation

Dermal

External
(Radiation)

Exposure
Routes Total

Primary
Target Organ(s)

Ingestion

Inhalation

Dermal

Exposure
Routes Total

Groundwater

Groundwater

OWR

2-Butanone

cis-1,2-Dichloroethene

Methyl tert-butyl ether

1.3E-12



8.6E-13



2.1E-12

Developmental
Urinary
NA

5.1 E-8
0.0000080



1.6E-8
0.000028

6.7E-8
0.000036







Trichloroethene

9.1E-10



3.7E-09



4.6E-09

Immune, Developmental

0.0028



0.011

0.014







1,4-Dioxane

2.8E-10



3.0E-11



3.1E-10

Hepatic

0.00000039



4.3E-8

0.00000043







Caprolactam











Urinary

0.00000038



0.00000013

0.00000051







Aluminum











Nervous

0.0059



0.0017

0.0075







Antimony











Hematologic

0.000059



0.00011

0.00017







Arsenic

6.6E-08



1.9E-08



8.5E-08

Dermal, CVS

0.010



0.0029

0.013







Barium











Urinary

0.00085



0.0034

0.0043







Beryllium











None Reported

0.00018



0.0074

0.0076







Cadmium











Urinary

0.000046



0.00026

0.00031







Cobalt











Thyroid

0.00021



0.000024

0.00023







Copper











GS

0.000051



0.000014

0.000066







Iron











GS

0.0055



0.0016

0.0070







Lead











NA

-













Manganese











Nervous

0.0022



0.015

0.018







Mercury











Nervous

0.0000023



0.0000094

0.000012







Nickel











Body Weight

0.000041



0.000057

0.000098







Selenium











Body Weight

0.000016



0.0000046

0.000021







Thallium











Dermal

0.0030



0.00083

0.0038







Vanadium











Urinary

0.00016



0.0017

0.0019







Zinc











Hematologic

0.000059



0.0000099

0.000069







Chemical Total

6.7E-08



2.2E-08



9.0E-08



0.031



0.047

0.08





Exposure Point Total



9.0E-08



0.08



Exposure IV

edium Total



9.0E-08



0.08


-------
TABLE 9.5.CTE

SUMMARY OF RECEPTOR RISKS AND HAZARDS FOR COPCs
CENTRAL TENDENCY EXPOSURES
OLD WILMINGTON ROAD SITE

		PAGE 3 OF 3

Scenario Timeframe: Future

Receptor Population: Construction Workers

Receptor Age: Adult	

Medium

Exposure

Exposure

Chemical



Carcinogenic Risk



Non-Carcinogenic Hazard Quotient







Medium

Point

of Potential























Concern

Ingestion

Inhalation

Dermal

External

Exposure

Primary

Ingestion

Inhalation

Dermal

Exposure















(Radiation)

Routes Total

Target Orqan(s)







Routes Total

Groundwater

Air

OWR

2-Butanone





-





Developmental

-

0.00013

-

0.00013







cis-1,2-Dichloroethene











NA

-













Methyl tert-butyl ether



3.9E-10





3.9E-10

Hepatic, Urinary, Ocular

»

0.000035



0.000035







Trichloroethene



1.6E-07





1.6E-07

Immune, Developmental

»

1.3



1.3







1,4-Dioxane



2.4E-09





2.4E-09

Respiratory

»

0.000048



0.000048







Caprolactam











Respiratory

-













Aluminum











Nervous

»













Antimony











NA

-













Arsenic











NA

»













Barium











Developmental

-













Beryllium











Immune, Respiratory

»













Cadmium











Urinary

»













Cobalt











Respiratory

»













Copper











NA

»













Iron











NA

»













Lead











NA

-













Manganese











Nervous

-













Mercury











Nervous

»













Nickel











Respiratory

»













Selenium











Respiratory

--













Thallium











NA

»



»

»







Vanadium











Respiratory

-



-

-







Zinc











NA

-



-

-







Chemical Total



1.6E-07





1.6E-07





1.3



1.3





Exposure Point Total



1.6E-07



1.3



Exposure IV

edium Total



1.6E-07



1.3

Vledium Total



2.5E-07



1.4

Receptor Total



Recep

or Risk Total

4.5E-07

Receptor HI Total

2.4

Notes:

1 - Mutagenic chemicals were evaluated in accordance with USEPA's Supplemental Guidance for Assessing Susceptibility from Early-Life Exposure to Carcinogens (2005).

Total Body Weight HI
Total CVS HI
Total Dermal HI
Total Developmental HI
Total GS HI
Total Hematologic HI
Total Hepatic HI
Total Immune HI
Total Nervous HI
Total None Reported HI
Total Reproductive HI
Total Respiratory HI
Total Thyroid HI
Total Urinary HI
Total Ocular HI


-------
TABLE 9.6.CTE

SUMMARY OF RECEPTOR RISKS AND HAZARDS FOR COPCs
CENTRAL TENDENCY EXPOSURES
OLD WILMINGTON ROAD SITE

		PAGE 1 OF 3

Scenario Timeframe: Future

Receptor Population: Industrial Worker

Receptor Age: Adult	

Medium

Exposure

Exposure

Chemical





Carcinogenic Risk



Non-Carcinogenic Hazard Quotient







Medium

Point

of Potential



























Concern

Ingestion

Inhalation

Dermal

External

Exposure

Primary

Ingestion

Inhalation

Dermal

Exposure















(Radiation)

Routes Total

Target Organ(s)







Routes Total

Surface/Subsurface Soil

Surface/Subsurface Soil

OWR

Benzo(a)pyrene

9.5E-09

-

1.7E-09

-

1.1E-08

Developmental, Immune, Reproductive

0.00032



0.000058

0.00037







Naphthalene











Body Weight

0.00018



0.000034

0.00022







Dieldrin

6.6E-08



9.3E-09



7.5E-08

Hepatic

0.00083



0.00012

0.00094







Aluminum











Nervous

0.0037



0.000053

0.0038







Antimony











Hematologic

0.006



0.00057

0.007







Arsenic

1.3E-07



9.4E-09



1.4E-07

Dermal, CVS

0.0030



0.00021

0.0032







Cobalt











Thyroid

0.0079



0.00011

0.0080







Copper











GS

0.006



0.00009

0.006







Iron











GS

0.010



0.00015

0.010







Lead











NA















Manganese











Nervous

0.0061



0.0021

0.0082







Thallium

--

-



-



Dermal

0.080



0.0011

0.081







Vanadium

--

-



-



Dermal

0.0018



0.0010

0.0027







Zinc



-



-



Hematologic, Immune

0.00048

-

0.000007

0.00048







Chemical Total

2.1E-07

-

2.0E-08

-

2.3E-07



0.127

-

0.0056

0.13





Exposure Point Total





2.3E-07



0.13



Exposure IV

edium Total



2.3E-07



0.13



Air

OWR

Benzo(a)pyrene



9E-13





9E-13

Developmental, Reproductive



0.0000078

-

0.0000078







Naphthalene



1E-07





1E-07

Nervous, Respiratory



0.011

-

0.011







Dieldrin



3E-12





3E-12

NA















Aluminum











Nervous



0.00012



0.00012







Antimony











NA















Arsenic



1E-10





1E-10

NA



0.000016



0.000016







Cobalt



4E-10





4E-10

Respiratory



0.000065



0.000065







Copper











NA















Iron











NA















Lead











NA















Manganese











Nervous



0.00048



0.00048







Thallium











NA















Vanadium











Respiratory



0.000015



0.000015







Zinc





-





NA















Chemical Total



1.1E-07

-

-

1.1E-07





0.012



0.012





Exposure Point Total





1.1E-07



0.012



Exposure Medium Total



1.1E-07



0.012

Vledium Total





3.4E-07



0.14


-------
TABLE 9.6.CTE

SUMMARY OF RECEPTOR RISKS AND HAZARDS FOR COPCs
CENTRAL TENDENCY EXPOSURES
OLD WILMINGTON ROAD SITE

		PAGE 2 OF 3

Scenario Timeframe: Future

Receptor Population: Industrial Worker

Receptor Age: Adult	

Medium

Exposure

Exposure

Chemical





Carcinogenic Risk



Non-Carcinogenic Hazard Quotient







Medium

Point

of Potential

























Concern

Ingestion

Inhalation

Dermal

External
(Radiation)

Exposure
Routes Total

Primary
Target Organ(s)

Ingestion

Inhalation

Dermal

Exposure
Routes Total

Groundwater

Groundwater

OWR

2-Butanone
2-Hexanone

--

-



-



Developmental
Nervous

0.0098
0.037



0.000035
0.00056

0.0098
0.037







Chloroform

1.2E-07



2.9E-09



1.3E-07

Hepatic

0.0042



0.00010

0.0043







cis-1,2-Dichloroethene











Urinary

0.0042



0.00013

0.0044







Vlethyl Tert-Butyl Ether

1.1E-08



7.2E-11



1.2E-08

NA















Tetrachloroethene

5.9E-08



9.5E-09



6.8E-08

Nervous, Ocular

0.049



0.008

0.057







Trichloroethene

2.1E-07



8.9E-09



2.2E-07

Immune, Developmental

0.095



0.0041

0.10







Vinyl Chloride

1.7E-07



2.7E-09



1.8E-07

Hepatic

0.00086



0.000013

0.00087







1,4-Dioxane

1.6E-07



2.5E-10



1.6E-07

Hepatic, Urinary

0.00058



0.00000088

0.00058







Bis(2-ethylhexyl)phthalate

6.5E-08







6.5E-08

Hepatic

0.0025





0.0025







Caprolactam











Developmental

0.025



0.00014

0.025







Aluminum











Nervous

0.26



0.00038

0.26







Antimony











Hematologic

0.015



0.00014

0.015







Arsenic

8.1E-06



1.2E-08



8.2E-06

Dermal, CVS

0.19



0.00028

0.19







Barium











Urinary

0.015



0.00032

0.015







Beryllium











GS

0.0078



0.0016

0.0094







Cadmium











Urinary

0.0038



0.00011

0.0039







Cobalt











Thyroid

0.96



0.00056

0.96







Copper











GS

0.0085



0.000012

0.0085







Iron











GS

0.29



0.00043

0.29







Lead











NA















Vlanganese











Nervous

0.47



0.017

0.49







Vlercury











Immune, Urinary

0.0019



0.000040

0.0020







Mickel











Body Weight

0.012



0.000085

0.012







Selenium











Hematologic, Dermal, Nervous

0.0028



0.0000041

0.0028







Thallium

--

-



-



Dermal

0.24



0.00036

0.24







Vanadium

--

-



-



Dermal

0.011



0.00063

0.012







Zinc

--

-



-



Hematologic, Immune

0.0057



0.0000050

0.0057







Chemical Total

8.9E-06

-

3.6E-08

-

9.0E-06



2.7



0.035

2.8





Exposure Point Total



9.0E-06



2.8



Exposure Medium Total



9.0E-06



2.8


-------
TABLE 9.6.CTE

SUMMARY OF RECEPTOR RISKS AND HAZARDS FOR COPCs
CENTRAL TENDENCY EXPOSURES
OLD WILMINGTON ROAD SITE

		PAGE 3 OF 3

Scenario Timeframe: Future

Receptor Population: Industrial Worker

Receptor Age: Adult	

Medium

Exposure

Exposure

Chemical



Carcinogenic Risk



Non-Carcinogenic Hazard Quotient







Medium

Point

of Potential

























Concern

Ingestion

Inhalation

Dermal

External

Exposure

Primary

Ingestion

Inhalation

Dermal

Exposure















(Radiation)

Routes Total

Target Organ(s)







Routes Total

Groundwater

Air

OWR

2-Butanone





-

-



Developmental, Musculosketal



0.0020



0.0020







2-Hexanone











Nervous



0.013



0.013







Chloroform



5.2E-07





5.2E-07

Hepatic



0.0024



0.0024







cis-1,2-Dichloroethene











NA















Vlethyl Tert-Butyl Ether



8.4E-09





8.4E-09

Hepatic, Urinary, Ocular



0.00011



0.00011







Tetrachloroethene



3.8E-08





3.8E-08

Nervous, Ocular



0.038



0.038







Trichloroethene



1.0E-07





1.0E-07

Immune, Developmental



0.13



0.13







Vinyl Chloride



7.9E-09





7.9E-09

Hepatic



0.00019



0.00019







1,4-Dioxane



1.4E-09





1.4E-09

Nervous, Respiratory



0.000097



0.000097







Bis(2-ethylhexyl)phthalate











NA















Caprolactam











Respiratory















Aluminum











Nervous















Antimony











NA















Arsenic











NA















Barium











Developmental















Beryllium











Immune, Respiratory















Cadmium











Urinary















Cobalt











Respiratory















Copper











NA















Iron











NA















Lead











NA















Vlanganese











Nervous















Vlercury











Nervous















Mickel











Respiratory















Selenium











Respiratory















Thallium





-

-



NA

»

»

»

»







Vanadium





-

-



Respiratory

-

-

-

-







Zinc





-

-



NA

-

-

-

-







Chemical Total



6.8E-07

-

-

6.8E-07





0.19



0.19





Exposure Point Total



6.8E-07



0.19



Exposure Medium Total



6.8E-07



0.19

Vledium Total





9.7E-06



3.0

Receptor Total



Recep

or Risk Total

1.0E-05

Receptor HI Total

3.1

Notes:

1 - Mutagenic chemicals were evaluated in accordance with USEPA's Supplemental Guidance for Assessing Susceptibility from Early-Life Exposure to Carcinogens (2005).

Total Body Weight HI

0.012

Total CVS HI

0.20

Total Dermal HI

0.54

Total Developmental HI

0.27

Total GS HI

0.33

Total Hematologic HI

0.030

Total Hepatic HI

0.012

Total Immune HI

0.24

Total Nervous HI

0.92

Total Respiratory HI

0.011

Total Thyroid HI

0.97

Total Urinary HI

0.026

Total Ocular HI

0.096

Total Reproductive HI

0.00038


-------
TABLE 9.7.CTE

SUMMARY OF RECEPTOR RISKS AND HAZARDS FOR COPCs
CENTRAL TENDENCY EXPOSURES
OLD WILMINGTON ROAD SITE
PAGE 1 OF 3

Scenario Timeframe: Future
Receptor Population: Residents
Receptor Age: Child

Medium

Exposure

Exposure

Chemical





Carcinogenic Risk



Non-Carcinogenic Hazard Quotient







Medium

Point

of Potential



























Concern

Ingestion

Inhalation

Dermal

External

Exposure

Primary

Ingestion

Inhalation

Dermal

Exposure















(Radiation)

RoutesTotal

Target Organ(s)







Routes Total

Surface/Subsurface Soil

Surface/Subsurface Soil

OWR

Benzo(a)pyrene

2.0E-07

-

2.5E-08



2.2E-07

Developmental, Immune, Reproductive

0.0036



0.00044

0.0040







Naphthalene



-







Body Weight

0.0021



0.00026

0.0024







Dieldrin

2.1E-07



2.0E-08



2.4E-07

Hepatic

0.0094

-

0.00089

0.010







Aluminum



-







Nervous

0.042



0.00040

0.043







Antimony



-



-



Hematologic

0.069



0.0044

0.074







Arsenic

4.3E-07

-

2.1E-08



4.5E-07

Dermal, CVS

0.034

-

0.0016

0.035







Cobalt



-







Thyroid

0.090



0.00085

0.091







Copper











GS

0.071



0.00067

0.071







Iron



-







GS

0.12



0.0011

0.12







Lead



-







NA







-







Manganese



-







Nervous

0.069



0.016

0.085







Thallium



-







Dermal

0.91



0.0086

0.92







Vanadium

--





-



Dermal

0.020



0.0074

0.028







Zinc

--





-



Hematologic, Immune

0.0054



0.000051

0.0055







Chemical Total

8.5E-07



6.6E-08

-

9.1E-07



1.4



0.043

1.5





Exposure Point Total





9.1E-07



1.5



Exposure Medium Total



9.1E-07



1.5



Air

OWR

Benzo(a)pyrene



5.6E-12



-

5.6E-12

Developmental, Reproductive



0.000025

-

0.000025







Naphthalene

-

1.0E-07

-

-

1.0E-07

Nervous, Respiratory

-

0.035

-

0.035







Dieldrin



2.9E-12





2.9E-12

NA

-

-

-

-







Aluminum

-









Nervous



0.00039

-

0.00039







Antimony

-



-

-



NA

-

-

-

-







Arsenic

-

9.6E-11

-

-

9.6E-11

NA



0.000052

-

0.000052







Cobalt



3.2E-10





3.2E-10

Respiratory

-

0.00021

-

0.00021







Copper

-



-

-



NA

-

-

-

-







Iron

-





-



NA







-







Lead

-



-

-



NA

-

-

-

-







Manganese

-



-

-



Nervous



0.0015



0.0015







Thallium

-



-

-



NA

-

-

-

-







Vanadium

-



-

-



Respiratory

-

0.000047

-

0.000047







Zinc

-



-

-



NA

-

-

-

-







Chemical Total

-

1.0E-07

-

-

1.0E-07





0.038



0.038





Exposure Point Total



1.0E-07



0.038



Exposure Medium Total



1.0E-07



0.038

Medium Total



1.0E-06



1.5


-------
TABLE 9.7.CTE

SUMMARY OF RECEPTOR RISKS AND HAZARDS FOR COPCs
CENTRAL TENDENCY EXPOSURES
OLD WILMINGTON ROAD SITE
PAGE 2 OF 3

Scenario Timeframe: Future
Receptor Population: Residents
Receptor Age: Child

Medium

Exposure

Exposure

Chemical





Carcinogenic Risk



Non-Carcinogenic Hazard Quotient







Medium

Point

of Potential



























Concern

Ingestion

Inhalation

Dermal

External
(Radiation)

Exposure
RoutesTotal

Primary
Target Organ(s)

Ingestion

Inhalation

Dermal

Exposure
Routes Total

Groundwater

Groundwater

OWR

2-Butanone
2-Hexanone



"







Developmental
Nervous

0.042
0.16

"

0.00046
0.0078

0.042
0.17







Chloroform

2.4E-07



2.6E-08



2.7E-07

Hepatic

0.018

-

0.0019

0.020







cis-1,2-Dichloroethene



-



-



Urinary

0.018

-

0.0027

0.021







Methyl Tert-Butyl Ether

2.2E-08

-

6.0E-10

-

2.3E-08

NA

-

-

-

-







Tetrachloroethene

1.1E-07

-

8.1E-08

-

1.9E-07

Nervous, Ocular

0.21

-

0.15

0.36







Trichloroethene (Mutagenic)

6.2E-07

-

1.2E-07

-

7.5E-07

NA

-

-

-

-







Trichloroethene (Nonmutagenic)

3.2E-07



6.4E-08



3.9E-07

Immune, Developmental

0.41



0.080

0.49







Vinyl Chloride

1.3E-05

-

1.2E-06

-

1.4E-05

Hepatic

0.0037

-

0.00033

0.0040







1,4-Dioxane

3.2E-07

-

1.4E-09

-

3.2E-07

Hepatic, Urinary

0.0025

-

0.000011

0.0025







Bis(2-ethylh exy I )phthalate

1.3E-07

-



-

1.3E-07

Hepatic

0.011

-

-

0.011







Caprolactam



-







Developmental

0.11



0.0016

0.11







Aluminum



-



-



Nervous

1.1



0.0052

1.1







Antimony



-



-



Hematologic

0.063

-

0.0020

0.065







Arsenic

1.6E-05

-

7.4E-08

-

1.6E-05

Dermal, CVS

0.82

-

0.0038

0.82







Barium



-



-



Urinary

0.065

-

0.0043

0.069







Beryllium



-



-



GS

0.033

-

0.022

0.055







Cadmium



-



-



Urinary

0.016

-

0.0015

0.018







Cobalt



-



-



Thyroid

4.1



0.0076

4.1







Copper



-



-



GS

0.0362

-

0.000169

0.0363







Iron



-



-



GS

1.2

-

0.0058

1.3







Lead



-



-



NA

-

-

-

-







Manganese



-



-



Nervous

2.0

-

0.24

2.3







Mercury



-



-



Immune, Urinary

0.0082

-

0.00055

0.0088







Nickel



-



-



Body Weight

0.050

-

0.0012

0.051







Selenium



-



-



Hematologic, Dermal, Nervous

0.012

-

0.000056

0.012







Thallium



-



-



Dermal

1.0

-

0.0048

1.0







Vanadium

--

-



-



Dermal

0.047

-

0.0085

0.056







Zinc

--

-



-



Hematologic, Immune

0.024

-

0.000068

0.024







Chemical Total

3.0E-05

-

1.5E-06

-

3.2E-05



11.7

-

0.55

12





Exposure Point Total



3.2E-05



12



Exposure to

edium Total



3.2E-05



12

Medium Total





3.2E-05



12


-------
TABLE 9.7.CTE

SUMMARY OF RECEPTOR RISKS AND HAZARDS FOR COPCs
CENTRAL TENDENCY EXPOSURES
OLD WILMINGTON ROAD SITE
PAGE 3 OF 3

Scenario Timeframe: Future
Receptor Population: Residents
Receptor Age: Child

Medium

Exposure
Medium

Exposure
Point

Chemical
of Potential

Carcinogenic Risk

Non-Carcinogenic Hazard Quotient







Concern

Ingestion

Inhalation

Dermal

External
(Radiation)

Exposure
RoutesTotal

Primary
Target Organ(s)

Ingestion

Inhalation

Dermal

Exposure
Routes Total

Sediment

Sediment

OWR

Cobalt
Nickel



"



"



Thyroid
Body Weight

0.022
0.036

~

0.000
0.0085

0.022
0.044







Chemical Total



-



-





0.058

-

0.009

0.07





Exposure Point Total







0.07



Exposure Medium Total







0.07

Medium Total







0.07

ReceptorTotal











Receptor Risk Total

3.3E-05

Receptor HI Total

14

Notes:

1 - Mutagenic chemicals were evaluated in accordance with USEPA's Supplemental Guidance for Assessing Susceptibility from Early-Life Exposure to Carcinogens (2005).

Total Body Weight HI
Total CVS HI
Total Dermal HI
Total Developmental HI
Total GS HI
Total Hematologic HI
Total Hepatic HI
Total Immune HI
Total Nervous HI
Total Respiratory HI
Total Thyroid HI
Total Urinary HI
Total Ocular HI
Total Reproductive HI


-------
TABLE 9.8.CTE

SUMMARY OF RECEPTOR RISKS AND HAZARDS FOR COPCs
CENTRAL TENDENCY EXPOSURES
OLD WILMINGTON ROAD SITE
PAGE 1 OF 3

Scenario Timeframe: Future	I

Receptor Population: Residents

Medium

Exposure

Exposure

Chemical





Carcinogenic Risk



Non-Carcinogenic Hazard Quotient







Medium

Point

of Potential



























Concern

Ingestion

Inhalation

Dermal

External

Exposure

Primary

Ingestion

Inhalation

Dermal

Exposure















(Radiation)

Routes Total

Tarqet Orqan(s)







Routes Total

Surface/Subsurface Soil

Surface/Subsurface Soil

OWR

Benzo(a)pyrene

1.6E-08

-

2.5E-09

-

1.8E-08

Developmental, Immune, Reproductive

0.00034

-

0.000053

0.00039







Naphthalene



-



-



Body Weight

0.00020



0.000031

0.00023







Dieldrin

7.1E-08

-

8.5E-09

-

7.9E-08

Hepatic

0.00088

-

0.00011

0.00099







Aluminum











Nervous

0.0040



0.000048

0.0040







Antimony



-







Hematologic

0.0065



0.00052

0.0070







Arsenic

1.4E-07

-

8.6E-09



1.5E-07

Dermal, CVS

0.0032

-

0.00019

0.0034







Cobalt



-







Thyroid

0.0084



0.00010

0.0085







Copper











GS

0.0066



0.000080

0.0067







Iron











GS

0.011



0.00013

0.011







Lead



-



-



NA

-

-

-

-







Manganese











Nervous

0.0065



0.0020

0.0084







Thallium











Dermal

0.085



0.0010

0.086







Vanadium







-



Dermal

0.0019



0.00088

0.0028







Zinc







-



Hematologic, Immune

0.00051



0.0000061

0.00051







Chemical Total

2.3E-07



2.0E-08

-

2.5E-07



0.14



0.0051

0.14





Exposure Point Total





2.5E-07



0.14



Exposure Medium Total



2.5E-07



0.14



Air

OWR

Benzo(a)pyrene



4.7E-12



-

5E-12

Developmental, Reproductive

-

0.000025

-

0.000025







Naphthalene

-

3.6E-07

-

-

4E-07

Nervous, Respiratory



0.035

-

0.035







Dieldrin

-

1.0E-11

-

-

1E-11

NA

-

-

-

-







Aluminum

-









Nervous



0.00039

-

0.00039







Antimony

-



-

-



NA

-

-

-

-







Arsenic

-

3.4E-10

-



3E-10

NA



0.000052

-

0.000052







Cobalt

-

1.1E-09

-

-

1E-09

Respiratory

-

0.00021

-

0.00021







Copper

-



-

-



NA

-

-

-

-







Iron

-



-

-



NA





-

-







Lead

-



-

-



NA

-

-

-

-







Manganese

-









Nervous



0.0015

-

0.0015







Thallium

-



-

-



NA

-

-

-

-







Vanadium

-



-

-



Respiratory

-

0.000047

-

0.000047







Zinc

-



-

-



NA

-

-

-

-







Chemical Total

-

3.6E-07

-

-

3.6E-07





0.038



0.038





Exposure Point Total



3.6E-07



0.038



Exposure Medium Total



3.6E-07



0.038

Medium Total



6.1E-07



0.18


-------
TABLE 9.8.CTE

SUMMARY OF RECEPTOR RISKS AND HAZARDS FOR COPCs
CENTRAL TENDENCY EXPOSURES
OLD WILMINGTON ROAD SITE
PAGE 2 OF 3

Scenario Timeframe: Future	I

Receptor Population: Residents

Medium

Exposure

Exposure

Chemical





Carcinogenic Risk



Non-Carcinogenic Hazard Quotient







Medium

Point

of Potential



























Concern

Ingestion

Inhalation

Dermal

External
(Radiation)

Exposure
Routes Total

Primary
Tarqet Orqan(s)

Ingestion

Inhalation

Dermal

Exposure
Routes Total

Groundwater

Groundwater

OWR

2-Butanone
2-Hexanone



"



"



Developmental
Nervous

0.021
0.079

"

0.00021
0.0033

0.021
0.082







Chloroform

3.6E-07

-

2.3E-08

-

3.8E-07

Hepatic

0.0090



0.00059

0.010







cis-1,2-Dichloroethene



-







Urinary

0.0090



0.0008

0.010







Methyl Tert-Butyl Ether

3.3E-08



5.8E-10



3.4E-08

NA

-

-

-

-







Tetrachloroethene

1.7E-07

-

7.7E-08

-

2.5E-07

Nervous, Ocular

0.11

-

0.048

0.15







Trichloroethene (Mutagenic)

1.8E-07

-

2.1E-08



2.0E-07

NA

-

-

-

-







Trichloroethene (Nonmutagenic)

4.8E-07



5.8E-08



5.4E-07

Immune, Developmental

0.20

-

0.024

0.23







Vinyl Chloride

5.1E-07

-

2.2E-08

-

5.3E-07

Hepatic

0.0018

-

0.00008

0.0019







1,4-Dioxane

4.7E-07

-

2.0E-09

-

4.8E-07

Hepatic, Urinary

0.0012

-

0.0000052

0.0012







Bis(2-ethylhexyl)phthalate

1.9E-07

-





1.9E-07

Hepatic

0.0053

-

-

0.0053







Caprolactam



-



-



Developmental

0.054

-

0.00082

0.055







Aluminum



-







Nervous

0.55



0.0023

0.56







Antimony



-







Hematologic

0.031



0.00086

0.032







Arsenic

2.4E-05

-

9.7E-08

-

2.4E-05

Dermal, CVS

0.41

-

0.0017

0.41







Barium











Urinary

0.032



0.0019

0.034







Beryllium











GS

0.017



0.0097

0.026







Cadmium



-



-



Urinary

0.0082



0.00067

0.0088







Cobalt



-



-



Thyroid

2.0

-

0.0034

2.1







Copper



-



-



GS

0.018

-

0.000074

0.018







Iron



-



-



GS

0.62

-

0.0026

0.63







Lead



-



-



NA

-

-

-

-







Manganese



-



-



Nervous

1.0

-

0.10

1.1







Mercury



-



-



Immune, Urinary

0.0041



0.00024

0.0043







Nickel



-



-



Body Weight

0.025

-

0.00051

0.025







Selenium



-



-



Hematologic, Dermal, Nervous

0.0060

-

0.000024

0.0060







Thallium



-



-



Dermal

0.52

-

0.0021

0.52







Vanadium



-



-



Dermal

0.024

-

0.0037

0.027







Zinc



-



-



Hematologic, Immune

0.012

-

0.000030

0.012







Chemical Total

2.6E-05

-

3.0E-07

-

2.6E-05



5.8

-

0.21

6.0





Exposure Point Total



2.6E-05



6.0



Exposure to

edium Total



2.6E-05



6.0


-------
TABLE 9.8.CTE

SUMMARY OF RECEPTOR RISKS AND HAZARDS FOR COPCs
CENTRAL TENDENCY EXPOSURES
OLD WILMINGTON ROAD SITE
PAGE 3 OF 3

Scenario Timeframe: Future
Receptor Population: Residents
j|Rece£torA^^^^^^^^^^_

Medium

Exposure

Exposure

Chemical





Carcinogenic Risk



Non-Carcinogenic Hazard Quotient







Medium

Point

of Potential



























Concern

Ingestion

Inhalation

Dermal

External
(Radiation)

Exposure
Routes Total

Primary
Tarqet Orqan(s)

Ingestion

Inhalation

Dermal

Exposure
Routes Total

Groundwater

Air

OWR

2-Butanone
2-Hexanone

"



"

"



Developmental, Musculosketal
Nervous

"

0.0022
0.014

"

0.0022
0.014







Chloroform

-

7.6E-07

-

-

7.6E-07

Hepatic

-

0.0026

-

0.0026







cis-1,2-Dichloroethene

-



-

-



NA

-

-

-

-







Methyl Tert-Butyl Ether

-

1.2E-08

-

-

1.2E-08

Hepatic, Urinary, Ocular

-

0.00012

-

0.00012







Tetrachloroethene

-

5.5E-08

-

-

5.5E-08

Nervous, Ocular

-

0.041

-

0.041







Trichloroethene (Mutagenic)

-

5.3E-08

-

-

5.3E-08

NA

-

-

-

-







Trichloroethene (Nonmutagenic)



1.1E-07





1.1E-07

Hepatic, Urinary



0.14

-

0.14







Vinyl Chloride



1.2E-08





1.2E-08

Hepatic

-

0.00020

-

0.00020







1,4-Dioxane

-

2.0E-09

-

-

2.0E-09

Nervous, Respiratory

-

0.00010

-

0.00010







Bis(2-ethylhexyl)phthalate

-



-

-



NA

-

-

-

-







Caprolactam

-



-





Respiratory















Aluminum

-









Nervous















Antimony

-



-





NA





-









Arsenic

-



-

-



NA

-

-

-

-







Barium











Developmental

-

-

-

-







Beryllium

-



-

-



Immune, Respiratory

-

-

-

-







Cadmium

-



-

-



Urinary

-

-

-









Cobalt

-



-

-



Respiratory

-

-

-

-







Copper

-



-

-



NA

-

-

-

-







Iron

-



-

-



NA

-

-

-

-







Lead

-



-

-



NA

-

-

-

-







Manganese

-



-

-



Nervous

-

-

-









Mercury

-



-

-



Nervous















Nickel

-



-

-



Respiratory

-

-

-

-







Selenium

-



-





Respiratory



-

-

-







Thallium

-



-

-



NA

-

-

-

-







Vanadium

-



-

-



Respiratory

-

-

-

-







Zinc

-



-

-



NA

-

-

-

-







Chemical Total

-

1.0E-06

-

-

1.0E-06





0.20



0.20





Exposure Point Total



1.0E-06



0.20



Exposure Medium Total



1.0E-06



0.20

Medium Total



2.7E-05



6.2

Sediment

Sediment

OWR

Cobalt



-



-



Thyroid

0.0021



0.0000

0.0021







Nickel



-



-



Body Weight

0.0033

-

0.0010

0.0043







Chemical Total



-



-





0.0054

-

0.0010

0.006





Exposure Point Total







0.006



Exposure Medium Total







0.006

Medium Total







0.006

ReceptorTotal











Receptor Risk Total

2.8E-05

Receptor HI Total

6.4

Notes:

1 - Mutagenic chemicals were evaluated in accordance with USEPA's Supplemental Guidance for Assessing Susceptibility from Early-Life Exposure to Carcinogens (2005).

Total Body Weight HI
Total CVS HI
Total Dermal HI
Total Developmental HI
Total GS HI
Total Hematologic HI
Total Hepatic HI
Total Immune HI
Total Nervous HI
Total Respiratory HI
Total Thyroid HI
Total Urinary HI
Total Ocular HI
Total Reproductive HI


-------
TABLE 9.9.CTE

SUMMARY OF RECEPTOR RISKS AND HAZARDS FOR COPCs
CENTRAL TENDENCY EXPOSURES
OLD WILMINGTON ROAD SITE
PAGE 1 OF 3

Scenario Timeframe: Future
Receptor Population: Residents
Receptor Age: Lifelong (Child and Adult)

Medium

Exposure

Exposure

Chemical





Carcinogenic Risk



Non-Carcinogenic Hazard Quotient







Medium

Point

of Potential



























Concern

Ingestion

Inhalation

Dermal

External
(Radiation)

Exposure
Routes Total

Primary
Target Organ(s)

Ingestion

Inhalation

Dermal

Exposure
Routes Total

Surface/Subsurface Soil

Surface/Subsurface Soil

OWR

Benzo(a)pyrene

Naphthalene

Dieldrin

Aluminum

Antimony

Arsenic

Cobalt

Copper

Iron

Lead

Manganese
Thallium
Vanadium
Zinc

2.2E-07
2.9E-07

5.8E-07

"

2.7E-08
2.9E-08

2.9E-08

"

2.4E-07
3.1E-07

6.1E-07

















Chemical Total

1.1E-06

-

8.5E-08

-

1.2E-06















Exposure Point Total



1.2E-06







Exposure Medium Total



1.2E-06







Air

OWR

Benzo(a)pyrene

Naphthalene

Dieldrin

Aluminum

Antimony

Arsenic

Cobalt

Copper

Iron

Lead

Manganese
Thallium
Vanadium
Zinc

-

1.0E-11
4.6E-07
1.3E-11

4.3E-10
1.4E-09

-

-

1E-11
5E-07
1E-11

4E-10
1E-09

















Chemical Total

-

4.6E-07

-

-

4.6E-07















Exposure Point Total



4.6E-07







Exposure Medium Total



4.6E-07





Medium Total



1.6E-06






-------
TABLE 9.9.CTE

SUMMARY OF RECEPTOR RISKS AND HAZARDS FOR COPCs
CENTRAL TENDENCY EXPOSURES
OLD WILMINGTON ROAD SITE
PAGE 2 OF 3

Scenario Timeframe: Future
Receptor Population: Residents
Receptor Age: Lifelong (Child and Adult)

Exposure
Medium

Exposure
Point

Chemical
of Potential
Concern

Carcinogenic Risk

External
(Radiation)

Exposure
Routes Total

Non-Carcinogenic Hazard Quotient

Primary
Target Organ(s)

Exposure Point Total

Expt

2-Butanone
2-Hexanone
Chloroform
cis-1,2-Dichloroethene
Methyl Tert-Butyl Ether
Tetrachloroethene
Trichloroethene (Mutagenic)
Trichloroethene (Nonmutagenic)
Vinyl Chloride
1,4-Dioxane

Bis(2-ethylh exy I )phthalate
Caprolactam
Aluminum
Antimony
Arsenic
Barium
Beryllium
Cadmium
Cobalt
Copper
Iron
Lead

Manganese
Mercury
Nickel
Selenium
Thallium
Vanadium

Zinc	

5.6E-08
2.8E-07
8.0E-07
8.1E-07
1.3E-05
7.9E-07
3.2E-07

1.2E-09
1.6E-07
1.4E-07
1.2E-07
1.2E-06
3.4E-09

Chemical Total

5.7E-08
4.4E-07
9.4E-07
9.3E-07
1.4E-05
7.9E-07
3.2E-07

'Osure Medium Total

Exposure
Routes Total


-------
TABLE 9.9.CTE

SUMMARY OF RECEPTOR RISKS AND HAZARDS FOR COPCs
CENTRAL TENDENCY EXPOSURES
OLD WILMINGTON ROAD SITE
PAGE 3 OF 3

Scenario Timeframe: Future
Receptor Population: Residents
Receptor Age: Lifelong (Child and Adult)

Medium

Exposure
Medium

Exposure
Point

Chemical
of Potential
Concern

Carcinogenic Risk

Non-Carcinogenic Hazard Quotient

Ingestion

Inhalation

Dermal

External
(Radiation)

Exposure
Routes Total

Primary
Target Organ(s)

Ingestion

Inhalation

Dermal

Exposure
Routes Total

Groundwater

Air

OWR

2-Butanone

2-Hexanone

Chloroform

cis-1,2-Dichloroethene

Methyl Tert-Butyl Ether

Tetrachloroethene

Trichloroethene (Mutagenic)

Trichloroethene (Nonmutagenic)

Vinyl Chloride

1,4-Dioxane

Bis(2-ethylh exy I )phthalate

Caprolactam

Aluminum

Antimony

Arsenic

Barium

Beryllium

Cadmium

Cobalt

Copper

Iron

Lead

Manganese

Mercury

Nickel

Selenium

Thallium

Vanadium

Zinc

"

7.6E-07

1.2E-08
5.5E-08
5.3E-08
1.1E-07
1.2E-08
2.0E-09

"

"

7.6E-07

1.2E-08
5.5E-08
5.3E-08
1.1E-07
1.2E-08
2.0E-09











Chemical Total

-

1.0E-06

-

-

1.0E-06











Exposure Point Total





1.0E-06







Exposure K

edium Total



1.0E-06





Medium Total





5.9E-05





Sediment

Sediment

OWR

Cobalt
Nickel























Chemical Total



-



-













Exposure Point Total











Exposure K

edium Total









Medium Total











Receptor Total

Receptor Risk Total

6.1E-05





Notes:

1 - Mutagenic chemicals were evaluated in accordance with USEPA's Supplemental Guidance for Assessing Susceptibility from Early-Life Exposure to Carcinogens (2005).


-------
RAGS Part D Table 10
Risk Summary


-------
LIST OF TABLES
RAGS PART D TABLE 10
SUMMARY OF RECEPTOR RISKS AND HAZARDS FOR COPCs

Table No.

Reasonable Maximum Exposures

10.1 .RME	Current Industrial Workers

1Q.2.RME	Current Child Residents

10.3.RME	Current Adult Residents

10.4.RME	Current Lifelong Residents

10.5.RME	Future Construction Workers

10.6.RME	Future Industrial Workers

10.7.RME	Future Child Residents

10.8.RME	Future Adult Residents

10.9.RME	Future Lifelong Residents

Central Tendency Exposures

10.1 .CTE	Current Industrial Workers

10.2.CTE	Current Child Residents

10.3.CTE	Current Adult Residents

10.4.CTE	Current Lifelong Residents

10.5.CTE	Future Construction Workers

10.6.CTE	Future Industrial Workers

10.7.CTE	Future Child Residents

10.8.CTE	Future Adult Residents

10.9.CTE	Future Lifelong Residents


-------
TABLE 10.1.RME
RISK SUMMARY
REASONABLE MAXIMUM EXPOSURES
OLD WILMINGTON ROAD SITE
PAGE 1 OF 1

Scenario Timeframe: Current

Receptor Population: Industrial Workers

Receptor Age: Adult	

Medium

Exposure
Medium

Exposure
Point

Chemical
of Potential
Concern

Carcinogenic Risk

Non-Carcinogenic Hazard Quotient

Ingestion Inhalation Dermal External
(Radiation)

Exposure
Routes Total

Primary Ingestion Inhalation Dermal
Target Orqan(s)

Exposure
Routes Total

Surface Soil

Surface Soil

OWR

Arsenic

All Cancer Risks Within Acceptable Levels

All Hazard Quotients Within Acceptable Levels

Chemical Total

- I - l - l -



i - i - i - ii -

Exposure Point Total









Exposure IV

edium Total





w

Air

OWR

Arsenic

All Cancer Risks Within Acceptable Levels

All Hazard Quotients Within Acceptable Levels

Chemical Total

- i -- i - i -



i - i - i -



Exposure Point Total









Exposure Medium Total









Vledium Total









Receptor Total

Receptor Risk Total



Receptor HI Total



Notes:

1 - Mutagenic chemicals were evaluated in accordance with USEPA's Supplemental Guidance for Assessing Susceptibility from Early-Life Exposure to Carcinogens (2005).


-------
TABLE 10.2.RME
RISK SUMMARY
REASONABLE MAXIMUM EXPOSURES
OLD WILMINGTON ROAD SITE

		PAGE 1 OF 1

Scenario Timeframe: Current
Receptor Population: Residents

Receptor Age: Child	

Medium

Exposure
Medium

Exposure
Point

Chemical
of Potential
Concern

Carcinogenic Risk

Non-Carcinogenic Hazard Quotient

Ingestion Inhalation Dermal External
(Radiation)

Exposure
Routes Total

Primary Ingestion Inhalation Dermal
Target Orqan(s)

Exposure
Routes Total

Surface Soil

Surface Soil

OWR



All Cancer Risks Within Acceptable Levels

All Hazard Quotients Within Acceptable Levels



Chemical Total

- I - l - l - ii

I -- I - i -- n

Exposure Point Total



li

1 -



Exposure IV

edium Total

i

n



Air

OWR I

All Cancer Risks Within Acceptable Levels

All Hazard Quotients Within Acceptable Levels

SiChemical Total

-- I -- I -- I -



I -- I - I --



Exposure Point Total











Exposure Medium Total









Vledium Total









Sediment [Sediment

OWR |

All Cancer Risks Within Acceptable Lev

sis

All Hazard Quotients Within Acceptable Levels



j|Chemical Total

i - i - - i -



I - I - I -



Exposure Point Total









jj Exposure Medium Total









Vledium Total









Receptor Total

Receptor Risk Total



Receptor HI Total |

Notes:

1 - Mutagenic chemicals were evaluated in accordance with USEPA's Supplemental Guidance for Assessing Susceptibility from Early-Life Exposure to Carcinogens (2005).


-------
TABLE 10.3.RME
RISK SUMMARY
REASONABLE MAXIMUM EXPOSURES
OLD WILMINGTON ROAD SITE

		PAGE 1 OF 1

Scenario Timeframe: Current
Receptor Population: Residents

Receptor Age: Adult	

Medium

Exposure
Medium

Exposure
Point

Chemical
of Potential
Concern

Carcinogenic Risk

Non-Carcinogenic Hazard Quotient

Ingestion Inhalation Dermal External
(Radiation)

Exposure
Routes Total

Primary Ingestion Inhalation Dermal
Target Orqan(s)

Exposure
Routes Total

Surface Soil

Surface Soil

OWR



All Cancer Risks Within Acceptable Levels

All Hazard Quotients Within Acceptable Levels

Chemical Total

- I - l - l -



i - i - i - ii -

Exposure Point Total









Exposure IV

edium Total





w

Air

OWR



All Cancer Risks Within Acceptable Levels

All Hazard Quotients Within Acceptable Levels

Chemical Total

- I -- I - I -



i - i - i - ii -

Exposure Point Total







Exposure Medium Total





\\

Vledium Total





j;

Surface Water [Surface Water

OWR



All Cancer Risks Within Acceptable Lev

sis

All Hazard Quotients Within Acceptable Levels

Chemical Total

i - i - - i -



i - i - i -







Exposure Point Total









Exposure Medium Total









Vledium Total









Sediment

Sediment

OWR



All Cancer Risks Within Acceptable Lev

rlS

All Hazard Quotients Within Acceptable Levels



Chemical Total

-- I - I -- I -



I -- I -- I --



Exposure Point Total









Exposure Medium Total









Vledium Total











Receptor Total

Receptor Risk Total



Receptor HI Total f

Notes:

1 - Mutagenic chemicals were evaluated in accordance with USEPA's Supplemental Guidance for Assessing Susceptibility from Early-Life Exposure to Carcinogens (2005).


-------
TABLE 10.4.RME
RISK SUMMARY
REASONABLE MAXIMUM EXPOSURES
OLD WILMINGTON ROAD SITE
PAGE 1 OF 1

Scenario Timeframe: Current
Receptor Population: Residents

Receptor Age: Lifelong (Child and Adult)	

Medium

Exposure
Medium

Exposure
Point

Chemical
of Potential
Concern

Carcinogenic Risk

Non-Carcinogenic Hazard Quotient

Ingestion Inhalation Dermal External
(Radiation)

Exposure
Routes Total

Primary
Target Organ(s)

Ingestion

Inhalation

Dermal

Exposure
Routes Total

Surface Soil

Surface Soil

OWR



All Cancer Risks Within Acceptable Levels











Chemical Total

-- l - l -- l













Exposure Point Total









Exposure Medium Total









Air

OWR I

All Cancer Risks Within Acceptable Leve

s











llChemical Total

- i - i - i -











Exposure Point Total

li





Exposure IV

edium Total

n





Medium Total



ii





Sediment

Sediment

OWR



All Cancer Risks Within Acceptable Levels











Chemical Total

- i - i - i - i











Exposure Point Total









Exposure Medium Total

!!





Medium Total

!!





Receptor Total

Receptor Risk Total |





Notes:

1 - Mutagenic chemicals were evaluated in accordance with USEPA's Supplemental Guidance for Assessing Susceptibility from Early-Life Exposure to Carcinogens (2005).


-------
TABLE 10.5.RME
RISK SUMMARY
REASONABLE MAXIMUM EXPOSURES
OLD WILMINGTON ROAD SITE
PAGE 1 OF 1

Scenario Timeframe: Future	I

Receptor Population: Construction Workers

Medium

Exposure

Exposure

Chemical





Carcinogenic Risk



Non-Carcinogenic Hazard Quotient







Medium

Point

of Potential



























Concern

Ingestion

Inhalation

Dermal

External

Exposure

Primary

Ingestion

Inhalation

Dermal

Exposure















(Radiation)

Routes Total

Target Organ(s)







Routes Total

Surface/Subsurface Soil

Surface/Subsurface Soil

OWR

Aluminum

All Cancer Risks Within Acceptable Levels

All Hazard Quotients Within Acceptable Levels







Chemical Total

--

-

--

-

6E-08

I - I - l -







Exposure Point Total



6E-08







Exposure Medium Total



6E-08







Air

OWR

Aluminum

All Cancer Risks Within Acceptable Levels

All Hazard Quotients Within Acceptable Levels







Chemical Total

- I - I - I -

1E-07

I - I - I -







Exposure Point Total



1E-07







Exposure Medium Total



1E-07





Medium Total



2E-07





Groundwater

Groundwater

OWR

Trichloroethene

All Cancer Risks Within Acceptable Levels

All Hazard Quotients Within Acceptable Levels





jjChemical Total

-- I - I -- I

9E-08

I - I - l -







Exposure Point Total



9E-08







Exposure Medium Total





9E-08







Air

OWR

Trichloroethene

-

3E-07

-

-

3E-07

Immune, Developmental

-

3

-

3





jjChemical Total

-

3E-07

-

-

3E-07





3



3





Exposure Point Total



3E-07



3



Exposure Medium Total





3E-07



3

Medium Total



3E-07



3

ReceptorTotal











Receptor Risk Total

5E-07

Receptor HI Total

3

Notes:

1 - Mutagenic chemicals were evaluated in accordance with USEPA's Supplemental Guidance for Assessing Susceptibility from Early-Life Exposure to Carcinogens (2005).


-------
TABLE 10.6.RME
RISK SUMMARY
REASONABLE MAXIMUM EXPOSURES
OLD WILMINGTON ROAD SITE
PAGE 1 OF 1

Scenario Timeframe: Future

Receptor Population: Industrial Worker

Receptor Age: Adult	

Medium

Exposure

Exposure

Chemical





Carcinogenic Risk



Non-Carcinogenic Hazard Quotient







Medium

Point

of Potential



























Concern

Ingestion

Inhalation

Dermal

External

Exposure

Primary

Ingestion

Inhalation

Dermal

Exposure















(Radiation)

Routes Total

Target Orqan(s)







Routes Total

Surface/Subsurface Soil

Surface/Subsurface Soil

OWR





All Cancer Risks Within A

cceptable Lev

sis

All Hazard Quotients Within Acceptable Levels







Chemical Total

--

-

--

-





-

-

-

-





Exposure Point Total



I;

i -



Exposure IV

edium Total

!!

i -



Air

OWR I

All Cancer Risks Within Acceptable Levels

All Hazard Quotients Within Acceptable Levels





I'chemical Total

- I -- l - l -



1 - 1 - 1 -







Exposure Point Total











Exposure Medium Total









Medium Total









Groundwater

Groundwater

OWR

Chloroform

1E-06

-

1E-08

-

1E-06

Hepatic

0.01



0.0001

0.01







Trichloroethene

2E-06

-

4E-08

-

2E-06

Immune, Developmental

0.2



0.005

0.2







Vinyl Chloride

2E-06

»

1E-08

»

2E-06

Hepatic

0.002



0.00002

0.002







1,4-Dioxane

1E-06



1E-09



1E-06

Hepatic, Urinary

0.001



0.000001

0.001







Aluminum











Nervous

0.6



0.0004

0.6







Arsenic

7E-05

-

5E-08

-

7E-05

Dermal, CVS

0.5



0.0003

0.5







Cobalt

--

-



-



Thyroid

2



0.0006

2







Vlanqanese

--

»



»



Nervous

1



0.02

1







Chemical Total

8E-05

-

1E-07

-

8E-05



5



0.03

5





Exposure Point Total



8E-05



5



Exposure Medium Total



8E-05



5

Groundwater

Air

OWR

Chloroform



2E-06

-

-

2E-06

Hepatic



0.003



0.003







Trichloroethene



4E-07

-

-

4E-07

Immune, Developmental



0.2



0.2







Vinyl Chloride



3E-08

»

»

3E-08

Hepatic



0.0002



0.0002







1,4-Dioxane



6E-09

»

»

6E-09

Nervous, Respiratory



0.0001



0.0001







Aluminum











Nervous















Arsenic











NA















Cobalt

-



-

-



Respiratory

-

-

-

-







Manganese

--



--

--



Nervous

--

--

--

--





lohemical Total

-

3E-06

-

-

3E-06





0.2



0.2





Exposure Point Total



3E-06



0.2



Exposure IV

edium Total



3E-06



0.2

Medium Total



8E-05



5

Receptor Total

Receptor Risk Total

8E-05

Receptor HI Total

5

Notes:

1 - Mutagenic chemicals were evaluated in accordance with USEPA's Supplemental Guidance for Assessing Susceptibility from Early-Life Exposure to Carcinogens (2005).


-------
TABLE 10.7.RME
RISK SUMMARY
REASONABLE MAXIMUM EXPOSURES
OLD WILMINGTON ROAD SITE
PAGE 1 OF 1

Scenario Timeframe: Future
Receptor Population: Residents

Receptor Age: Child	

Medium

Exposure

Exposure

Chemical





Carcinogenic Risk



Non-Carcinogenic Hazard Quotient







Medium

Point

of Potential



























Concern

Ingestion

Inhalation

Dermal

External

Exposure

Primary

Ingestion

Inhalation

Dermal

Exposure















(Radiation)

Routes Total

Target Organ(s)







Routes Total

Surface/Subsurface Soil

Surface/Subsurface Soil

OWR

Arsenic

4E-06



5E-07



4E-06

Dermal, CVS

0.1



0.01

0.1







Cobalt











Thyroid

0.3



0.01

0.3







Copper











GS

0.2



0.01

0.2







Iron











GS

0.4



0.01

0.4







Manganese











Nervous

0.2



0.1

0.3







Thallium











Dermal

3



0.06

3







Chemical Total

4E-06



5E-07



4E-06



4



0.2

4





Exposure Point Total





4E-06



4



Exposure Medium Total



4E-06



4



Air

OWR

Arsenic



4E-10





4E-10

NA



0.00008



0.00008







Cobalt



1E-09





1E-09

Respiratory



0.0003



0.0003







Copper











NA















Iron











NA















Vlanganese











Nervous



0.002



0.002







Thallium











NA















Chemical Total

-

2E-09

-

-

2E-09





0.003



0.003





Exposure Point Total





2E-09



0.003



Exposure Medium Total



2E-09



0.003

Vledium Total





4E-06



4

Groundwater

Groundwater

OWR

2-Hexanone











Nervous

0.4



0.01

0.4







Tetrachloroethene

6E-07



3E-07



9E-07

Nervous, Ocular

0.5



0.3

0.8







Trichloroethene (Mutagenic)

2E-06



3E-07



3E-06

NA















Trichloroethene (Nonmutageni

2E-06



2E-07



2E-06

Immune, Developmental

1



0.2

1







Vinyl Chloride

2E-05



2E-06



2E-05

Hepatic

0.009



0.0006

0.01







1,4-Dioxane

2E-06



5E-09



2E-06

Hepatic, Urinary

0.006



0.00002

0.006







Caprolactam











Developmental

0.3



0.003

0.3







Aluminum











Nervous

3



0.01

3







Arsenic

8E-05



4E-07



8E-05

Dermal, CVS

2



0.009

2







Cobalt











Thyroid

11



0.02

11







Iron











GS

3



0.01

3







Manganese











Nervous

5



0.6

6







Thallium



-



-



Dermal

3

»

0.01

3







Chemical Total

1E-04

-

3E-06

-

1E-04



29

-

1

30





Exposure Point Total



1E-04



30



Exposure IV

edium Total



1E-04



30

Vledium Total



1E-04



30

Sediment

Sediment

OWR





























Chemical Total















-

-

0.0





Exposure Point Total







-

IE Exposure Medium Total









-

Vledium Total







-

Receptor Total

Receptor Risk Total

1E-04

Receptor HI Total

34

Notes:

1 - Mutagenic chemicals were evaluated in accordance with USEPA's Supplemental Guidance for Assessing Susceptibility from Early-Life Exposure to Carcinogens (2005).


-------
TABLE 10.8.RME
RISK SUMMARY
REASONABLE MAXIMUM EXPOSURES
OLD WILMINGTON ROAD SITE
PAGE 1 OF 1

Scenario Timeframe:

Future

Receptor Population:

Residents

Receptor Aqe: Adult



Medium

Exposure

Exposure

Chemical





Carcinogenic Risk



Non-Carcinogenic Hazard Quotient







Medium

Point

of Potential



























Concern

Ingestion

Inhalation

Dermal

External

Exposure

Primary

Ingestion

Inhalation

Dermal

Exposure















(Radiation)

Routes Total

Target Organ(s)







Routes Total

Surface/Subsurface Soil

Surface/Subsurface Soil

OWR

Thallium

--

-



-



Dermal

0.3



0.01

0.3







Chemical Total



-



-





0.3

-

0.01

0.3





Exposure Point Total









0.3



Exposure IV

edium Total







0.3



Air

OWR

Thallium





-

-



NA





-

-







Chemical Total





-

-







0.00



0.00





Exposure Point Total







0.00



Exposure Medium Total







0.00

Medium Total







0.27

Groundwater

Groundwater

OWR

2-Hexanone

--

-



-



Nervous

0.2



0.008

0.3







Chloroform

2E-06

-

1E-07

-

3E-06

Hepatic

0.03



0.001

0.03







Tetrachloroethene

1E-06

»

4E-07

»

2E-06

Nervous, Ocular

0.3



0.1

0.4







Trichloroethene (Mutagenic)

2E-06



2E-07



2E-06

NA















Trichloroethene (Nonmutageni

3E-06



3E-07



4E-06

Immune, Developmental

0.6



0.1

0.7







Vinyl Chloride

4E-06



1E-07



4E-06

Hepatic

0.006



0.0002

0.006







1,4-Dioxane

3E-06



1E-08



3E-06

Hepatic, Urinary

0.004



0.00001

0.004







Aluminum











Nervous

2



0.010

2







Arsenic

2E-04



9E-07



2E-04

Dermal, CVS

1



0.007

1







Cobalt











Thyroid

6



0.01

6







Iron











GS

2



0.01

2







Vlanganese











Nervous

3



0.4

4







Vlercury











Immune, Urinary

0.01



0.001

0.01







Thallium



-







Dermal

2



0.009

2







Chemical Total

2E-04

-

2E-06

-

2E-04



17



1

18





Exposure Point Total





2E-04



18



Exposure Medium Total



2E-04



18

Groundwater

Air

OWR

2-Hexanone

-



-

-



Nervous

-

0.3

-

0.3







Chloroform



3E-05

-



3E-05

Hepatic



0.05



0.05







Tetrachloroethene



2E-06





2E-06

Nervous, Ocular



0.8



0.8







Trichloroethene (Mutagenic)



3E-06





3E-06

NA















Trichloroethene (Nonmutageni



5E-06





5E-06

Hepatic, Urinary



3



3







Vinyl Chloride



5E-07





5E-07

Hepatic



0.004



0.004







1,4-Dioxane



9E-08





9E-08

Nervous, Respiratory



0.002



0.002







Aluminum











Nervous















Arsenic











NA















Cobalt











Respiratory















Iron





»

»



NA















Manganese





»

»



Nervous















Thallium





-

-



NA





-

-







Chemical Total



4E-05

-

-

4E-05





4



4





Exposure Point Total





4E-05



4



Exposure Medium Total



4E-05



4

Vledium Total





2E-04



22

Sediment

Sediment

OWR

Cobalt



-



-



Thyroid

0.01

-

0.00

0.01







Chemical Total



-



-





0.01

-

0.00

0.01





Exposure Point Total







0.01

H Exposure IV

edium Total







0.01

Vledium Total







0.01

Receptor Total

Receptor Risk Total

2E-04

Receptor HI Total

22

Notes:

1 - Mutagenic chemicals were evaluated in accordance with USEPA's Supplemental Guidance for Assessing Susceptibility from Early-Life Exposure to Carcinogens (2005).


-------
TABLE 10.9. RME
RISK SUMMARY
REASONABLE MAXIMUM EXPOSURES
OLD WILMINGTON ROAD SITE
PAGE 1 OF 1

Scenario Timeframe: Future
Receptor Population: Residents
Receptor Age: Lifelong (Child and Adult)

Medium

Exposure
Medium

Exposure
Point

Chemical
of Potential
Concern

Carcinogenic Risk

Non-Carcinogenic Hazard Quotient

Ingestion

Inhalation

Dermal

External
(Radiation)

Exposure
Routes Total

Primary
Target Organ(s)

Ingestion

Inhalation

Dermal

Exposure
Routes Total

Surface/Subsurface Soil

Surface/Subsurface Soil

OWR

Arsenic

5E-06

-

7E-07

-

6E-06











Chemical Total

5E-06

-

7E-07

-

6E-06









Exposure Point Total



6E-06





Exposure Medium Total



6E-06





Air

OWR

Arsenic

-



-

-

2E-09











Chemical Total

-

2E-09

-

-

2E-09









Exposure Point Total



2E-09





Exposure Medium Total



2E-09





Medium Total



6E-06





Groundwater

Groundwater



Chloroform
Tetrachloroethene
Trichloroethene (Mutagenic)
Trichloroethene (Nonmutagenic)
Vinyl Chloride
1,4-Dioxane

Bis(2-ethylh exyl )phthalate
Arsenic

2E-06
4E-06
5E-06
3E-05
5E-06
2E-06
2E-04

"

7E-07
5E-07
6E-07
2E-06
2E-08

1E-06



4E-06
3E-06
4E-06
6E-06
3E-05
5E-06
2E-06
2E-04











Chemical Total

3E-04

-

5E-06

-

3E-04









Exposure Point Total



3E-04





Exposure Medium Total



3E-04





Groundwater

Air

OWR

Chloroform
Tetrachloroethene
Trichloroethene (Mutagenic)
Trichloroethene (Nonmutagenic)
Vinyl Chloride
1,4-Dioxane

Bis(2-ethylh exyl )phthalate
Arsenic

"

3E-05
2E-06
3E-06
5E-06
5E-07
9E-08

"

"

3E-05
2E-06
3E-06
5E-06
5E-07
9E-08











Chemical Total

-

4E-05

-

-

4E-05









Exposure Point Total



4E-05





Exposure Medium Total



4E-05





Medium Total



3E-04





Sediment

Sediment

OWR



All Cancer Risks Within Acceptable Levels











Chemical Total

I I I -











Exposure Point Total









Exposure Medium Total









Medium Total









Receptor Total Receptor Risk Total | 3E-04





Notes:

1 - Mutagenic chemicals were evaluated in accordance with USEPA's Supplemental Guidance for Assessing Susceptibility from Early-Life Exposure to Carcinogens (2005).


-------
TABLE 10.1.CTE
RISK SUMMARY
CENTRAL TENDENCY EXPOSURES
OLD WILMINGTON ROAD SITE

		PAGE 1 OF 1

Scenario Timeframe: Current

Receptor Population: Industrial Workers

Receptor Age: Adult	

Medium

Exposure
Medium

Exposure
Point

Chemical
of Potential
Concern

Carcinogenic Risk

Non-Carcinogenic Hazard Quotient

Ingestion Inhalation Dermal External
(Radiation)

Exposure
Routes Total

Primary Ingestion Inhalation Dermal
Target Orqan(s)

Exposure
Routes Total

Surface Soil

Surface Soil

OWR



All Cancer Risks Within Acceptable Levels

All Hazard Quotients Within Acceptable Levels

Chemical Total

- I - l - l -



[-[-[-



Exposure Point Total











Exposure IV

edium Total









Air

OWR



All Cancer Risks Within Acceptable Levels

All Hazard Quotients Within Acceptable Levels

Chemical Total

- I -- l - l -



I - I - I -



Exposure Point Total









Exposure Medium Total









Vledium Total









Receptor Total

Receptor Risk Total



Receptor HI Total



Notes:

1 - Mutagenic chemicals were evaluated in accordance with USEPA's Supplemental Guidance for Assessing Susceptibility from Early-Life Exposure to Carcinogens (2005).


-------
TABLE 10.2.CTE
RISK SUMMARY
CENTRAL TENDENCY EXPOSURES
OLD WILMINGTON ROAD SITE
PAGE 1 OF 1

Scenario Timeframe: Current
Receptor Population: Residents

Receptor Age: Child	

Medium

Exposure
Medium

Exposure
Point

Chemical
of Potential
Concern

Carcinogenic Risk

Non-Carcinogenic Hazard Quotient

Ingestion Inhalation Dermal External
(Radiation)

Exposure
Routes Total

Primary Ingestion Inhalation Dermal
Target Orqan(s)

Exposure
Routes Total

Surface Soil

Surface Soil

OWR



All Cancer Risks Within Acceptable Levels

All Hazard Quotients Within Acceptable Levels

Chemical Total

- I - l - l -



i - i - i - ii -

Exposure Point Total









Exposure IV

edium Total





|

Air

OWR



All Cancer Risks Within Acceptable Levels

All Hazard Quotients Within Acceptable Levels

Chemical Total

-- l - l -- l -



1 - 1 - 1 -



Exposure Point Total









Exposure Medium Total









Vledium Total









Sediment jSediment

OWR



All Cancer Risks Within Acceptable Lev

;ls

All Hazard Quotients Within Acceptable Levels



Chemical Total

- i - i - i -



1 - 1 - 1 -







Exposure Point Total









Exposure Medium Total









Vledium Total









Receptor Total

Receptor Risk Total



Receptor HI Total



Notes:

1 - Mutagenic chemicals were evaluated in accordance with USEPA's Supplemental Guidance for Assessing Susceptibility from Early-Life Exposure to Carcinogens (2005).


-------
TABLE 10.3.CTE
RISK SUMMARY
CENTRAL TENDENCY EXPOSURES
OLD WILMINGTON ROAD SITE

		PAGE 1 OF 1

Scenario Timeframe: Current
Receptor Population: Residents

Receptor Age: Adult	

Medium

Exposure
Medium

Exposure
Point

Chemical
of Potential
Concern

Carcinogenic Risk

Non-Carcinogenic Hazard Quotient

Ingestion Inhalation Dermal External
(Radiation)

Exposure
Routes Total

Primary Ingestion Inhalation Dermal
Target Orqan(s)

Exposure
Routes Total

Surface Soil

Surface Soil

OWR



All Cancer Risks Within Acceptable Levels

All Hazard Quotients Within Acceptable Levels

Chemical Total

- I - l - l -



i - i - i - ii -

Exposure Point Total









Exposure IV

edium Total





w

Air

OWR



All Cancer Risks Within Acceptable Levels

All Hazard Quotients Within Acceptable Levels

Chemical Total

- I -- I - I -



I - I - I -



Exposure Point Total









Exposure Medium Total









Vledium Total









Sediment [Sediment

OWR



All Cancer Risks Within Acceptable Lev

sis

All Hazard Quotients Within Acceptable Levels



Chemical Total

-- I - I -- I -



i - i - i -







Exposure Point Total









Exposure Medium Total









Vledium Total









Receptor Total

Receptor Risk Total



Receptor HI Total



Notes:

1 - Mutagenic chemicals were evaluated in accordance with USEPA's Supplemental Guidance for Assessing Susceptibility from Early-Life Exposure to Carcinogens (2005).


-------
TABLE 10.4.CTE
RISK SUMMARY
CENTRAL TENDENCY EXPOSURES
OLD WILMINGTON ROAD SITE
PAGE 1 OF 1

Scenario Timeframe: Current
Receptor Population: Residents

Receptor Age: Lifelong (Child and Adult)	

Medium

Exposure
Medium

Exposure
Point

Chemical
of Potential
Concern

Carcinogenic Risk

Non-Carcinogenic Hazard Quotient

Ingestion Inhalation Dermal External
(Radiation)

Exposure
Routes Total

Primary
Target Organ(s)

Ingestion

Inhalation

Dermal

Exposure
Routes Total

Surface Soil

Surface Soil

OWR



All Cancer Risks Within Acceptable Levels











Chemical Total

- I - l - l -













Exposure Point Total











Exposure IV

edium Total









Air

OWR



All Cancer Risks Within Acceptable Levels











Chemical Total

- I -- I - I -













Exposure Point Total









Exposure Medium Total









Vledium Total









Sediment [Sediment

OWR

Cobalt

All Cancer Risks Within Acceptable Lev

sis











Chemical Total

-- I - I -- I -

















Exposure Point Total









Exposure Medium Total









Vledium Total









Receptor Total

Receptor Risk Total







Notes:

1 - Mutagenic chemicals were evaluated in accordance with USEPA's Supplemental Guidance for Assessing Susceptibility from Early-Life Exposure to Carcinogens (2005).


-------
TABLE 10.5.CTE
RISK SUMMARY
CENTRAL TENDENCY EXPOSURES
OLD WILMINGTON ROAD SITE
PAGE 1 OF 1

[Scenario Timeframe: Future	I

Receptor Population: Construction Workers

Medium

Exposure
Medium

Exposure
Point

Chemical
of Potential
Concern

Carcinogenic Risk

Non-Carcinogenic Hazard Quotient

Ingestion Inhalation Dermal External
(Radiation)

Exposure
Routes Total

Primary Ingestion Inhalation Dermal
Target Organ(s)

Exposure
Routes Total

Surface/Subsurface Soil

Surface/Subsurface Soil

OWR



All Cancer Risks Within Acceptable Levels

All Hazard Quotients Within Acceptable Levels

Chemical Total

- I - I - I -



I - I - I -



Exposure Point Total









Exposure Medium Total









Air

OWR



All Cancer Risks Within Acceptable Levels

All Hazard Quotients Within Acceptable Levels

Chemical Total

- I - I - I . i

I - I - I -



Exposure Point Total







Exposure Medium Total

II





Medium Total

II





Groundwater

Groundwater

OWR



All Cancer Risks Within Acceptable Levels

All Hazard Quotients Within Acceptable Levels

Chemical Total

-- I - I -- I -



I -- I -- I --



Exposure Point Total









Exposure Medium Total









Groundwater

Air

OWR



All Cancer Risks Within Acceptable Levels

All Hazard Quotients Within Acceptable Levels

Chemical Total

- I -- I - I -



I -- I -- I --



Exposure Point Total









Exposure Medium Total









Medium Total







--

ReceptorTotal Receptor RiskTotal |

Receptor HI Total ( -- |

Notes:

1 - Mutagenic chemicals were evaluated in accordance with USEPA's Supplemental Guidance for Assessing Susceptibility from Early-Life Exposure to Carcinogens (2005).


-------
TABLE 10.6.CTE
RISK SUMMARY
CENTRAL TENDENCY EXPOSURES
OLD WILMINGTON ROAD SITE

		PAGE 1 OF 1

Scenario Timeframe: Future

Receptor Population: Industrial Worker

Receptor Age: Adult	

Medium

Exposure
Medium

Exposure
Point

Chemical
of Potential
Concern

Carcinogenic Risk

Non-Carcinogenic Hazard Quotient

Ingestion Inhalation Dermal External
(Radiation)

Exposure
Routes Total

Primary Ingestion Inhalation Dermal
Target Orqan(s)

Exposure
Routes Total

Surface/Subsurface Soil

Surface/Subsurface Soil

OWR



All Cancer Risks Within Acceptable Levels

All Hazard Quotients Within Acceptable Levels

Chemical Total

- I - l - l -



i - i - i - ii -

Exposure Point Total









Exposure IV

edium Total





|

Air

OWR



All Cancer Risks Within Acceptable Levels

All Hazard Quotients Within Acceptable Levels

Chemical Total

- I -- l - l -



1 - 1 - 1 -

-

Exposure Point Total









Exposure Medium Total









Medium Total









Groundwater

Groundwater

OWR



All Cancer Risks Within Acceptable Lev

sis

All Hazard Quotients Within Acceptable Levels



Chemical Total

- i - i - i -



1 - 1 - 1 -



Exposure Point Total









Exposure Medium Total







-

Groundwater

Air

OWR



All Cancer Risks Within Acceptable Levels

All Hazard Quotients Within Acceptable Levels

Chemical Total

- I - I - I -



| -- I 0.00 1 --

-

Exposure Point Total







-

Exposure IV

edium Total







-

Medium Total







-

Receptor Total

Receptor Risk Total



Receptor HI Total

--

Notes:

1 - Mutagenic chemicals were evaluated in accordance with USEPA's Supplemental Guidance for Assessing Susceptibility from Early-Life Exposure to Carcinogens (2005).


-------
TABLE 10.7.CTE
RISK SUMMARY
CENTRAL TENDENCY EXPOSURES
OLD WILMINGTON ROAD SITE

		PAGE 1 OF 1

Scenario Timeframe: Future
Receptor Population: Residents

Receptor Age: Child	

Medium

Exposure
Medium

Exposure
Point

Chemical
of Potential
Concern

Carcinogenic Risk

Non-Carcinogenic Hazard Quotient

Ingestion

Inhalation

Dermal

External
(Radiation)

Exposure
Routes Total

Primary
Tarqet Orqan(s)

Ingestion

Inhalation

Dermal

Exposure
Routes Total

Surface/Subsurface Soil

Surface/Subsurface Soil

OWR

Thallium











Dermal

0.9



0.01

0.9

Chemical Total



-



-





0.9

-

0.01

1

Exposure Point Total









1

Exposure IV

edium Total







1

Air

OWR

Thallium





-

-



NA







-

Chemical Total





-

-











-

Exposure Point Total







-

Exposure Medium Total







-

Vledium Total







1

Groundwater

Groundwater

OWR

2-Hexanone

Tetrachloroethene

Vinyl Chloride

Aluminum

Arsenic

Cobalt

Iron

Manganese
Thallium

1E-07
1E-05

2E-05

-

8E-08
1E-06

7E-08



2E-07
1E-05

2E-05

Nervous
Nervous, Ocular
Hepatic
Nervous
Dermal, CVS
Thyroid

GS
Nervous
Derm al

0.2
0.2
0.004
1

0.8
4

1

2
1



0.008
0.1
0.0003
0.005
0.004
0.008
0.006
0.2
0.005

0.2
0.4
0.004
1

0.8
4

1

2
1

Chemical Total

3E-05

-

1E-06

-

3E-05



11

-

0.4

11

Exposure Point Total



3E-05



11

Exposure IV

edium Total



3E-05



11

Vledium Total



3E-05



11

Sediment

Sediment

OWR

Cobalt



-



-



All Hazard Quotients Within Acceptable Levels



Chemical Total



-



-



I - I - I -

-

Exposure Point Total







-



Exposure Medium Total







-

Vledium Total







-

Receptor Total

Receptor Risk Total

3E-05

Receptor HI Total

11

Notes:

1 - Mutagenic chemicals were evaluated in accordance with USEPA's Supplemental Guidance for Assessing Susceptibility from Early-Life Exposure to Carcinogens (2005).


-------
TABLE 10.8.CTE
RISK SUMMARY
CENTRAL TENDENCY EXPOSURES
OLD WILMINGTON ROAD SITE
PAGE 1 OF 1

[Scenario Timeframe: Future	I

Receptor Population: Residents

Medium

Exposure
Medium

Exposure
Point

Chemical
of Potential
Concern

Carcinogenic Risk

Non-Carcinogenic Hazard Quotient

Ingestion

Inhalation

Dermal

External
(Radiation)

Exposure
Routes Total

Primary
Target Organ(s)

Ingestion

Inhalation

Dermal

Exposure
Routes Total

Surface/Subsurface Soil

Surface/Subsurface Soil

OWR



All Cancer Risks Within Acceptable Levels

All Hazard Quotients Within Acceptable Levels

Chemical Total

I - i -- i - it

I - I - I -



Exposure Point Total

I





Exposure Medium Total

ii





Air

OWR



All Cancer Risks Within Acceptable Levels

All Hazard Quotients Within Acceptable Levels

Chemical Total

- I - I - I -



I - I - I -



Exposure Point Total









Exposure Medium Total









Medium Total









Groundwater

Groundwater

OWR

Tetrachloroethene
Aluminum
Cobalt
Manganese

2E-07

"

8E-08

"

2E-07

Nervous, Ocular
Nervous
Thyroid
Nervous

0.1
0.6
2
1

"

0.05
0.002
0.003
0.1

0.2
0.6
2
1

Chemical Total

2E-07



8E-08

-

2E-07



4

-

0.2

4

Exposure Point Total



2E-07



4

Exposure Medium Total



2E-07



4

Groundwater

Air

OWR

Tetrachloroethene
Aluminum
Cobalt
Manganese

"

5E-08

"

"

5E-08

Nervous, Ocular
Nervous
Respiratory
Nervous

"

0.04

"

0.04

Chemical Total

-

5E-08

-

-

5E-08





0.04



0.04

Exposure Point Total



5E-08



0.04

Exposure Medium Total



5E-08



0.04

Medium Total



3E-07



4

Surface Water

Surface Water

OWR



All Cancer Risks Within Acceptable Levels

All Hazard Quotients Within Acceptable Levels

Chemical Total

I - I I -



I -- I - I



Exposure Point Total









Exposure Medium Total









Medium Total









Sediment

Sediment

OWR



All Cancer Risks Within Acceptable Levels

All Hazard Quotients Within Acceptable Levels

Chemical Total

I - I I -



I -- I - I



Exposure Point Total









Exposure Medium Total









Medium Total









ReceptorTotal Receptor Risk Total | 3E-07

Receptor HI Total ( 4

Notes:

1 - Mutagenic chemicals were evaluated in accordance with USEPA's Supplemental Guidance for Assessing Susceptibility from Early-Life Exposure to Carcinogens (2005).


-------
TABLE 10.9.CTE
RISK SUMMARY
CENTRAL TENDENCY EXPOSURES
OLD WILMINGTON ROAD SITE
PAGE 1 OF 1

Scenario Timeframe: Future
Receptor Population: Residents
Receptor Age: Lifelong (Child and Adult)

Medium

Exposure

Exposure

Chemical





Carcinogenic Risk



Non-Carcinogenic Hazard Quotient







Medium

Point

of Potential



























Concern

Ingestion

Inhalation

Dermal

External

Exposure

Primary

Ingestion

Inhalation

Dermal

Exposure















(Radiation)

Routes Total

Target Organ(s)







Routes Total

Surface/Subsurface Soil

Surface/Subsurface Soil

OWR



All Cancer Risks Within Acceptable Levels















Chemical Total

| .. | .. | .. Ij















Exposure Point Total

II







Exposure Medium Total

II







Air

OWR



All Cancer Risks Within Acceptable Levels















Chemical Total

-

--

-

-















Exposure Point Total







Exposure Medium Total



ii

Medium Total



»

Groundwater

Groundwater

OWR



All Cancer Risks Within Acceptable Levels







I







Chemical Total

- I - I - I -

















Exposure Point Total











Exposure Medium Total









Groundwater

Air

OWR



All Cancer Risks Within Acceptable Levels













jjChemical total

- I -- I - I -















Exposure Point Total









Exposure Medium Total







Medium Total





ii

Surface Water

Surface Water

OWR



All Cancer Risks Within Acceptable Levels











Chemical Total

--

-

--

-





1 1







Exposure Point Total











Exposure Medium Total









Medium Total









Sediment

Sediment

OWR

Cobalt



-



-

















Chemical Total



-



- 1















Exposure Point Total









Exposure Medium Total

II





Medium Total

II





ReceptorTotal











Receptor Risk Total







Notes:

1 - Mutagenic chemicals were evaluated in accordance with USEPA's Supplemental Guidance for Assessing Susceptibility from Early-Life Exposure to Carcinogens (2005).


-------
APPENDIX G
PADEPCONCURRENCE LETTER

54


-------
Pennsylvania

DEPARTMENT OF ENVIRONMENTAL

PROTECTION

April 5, 2023

Mr, Paul Leonard, Director

Superfund and Emergency Management Division

U.S, Environmental Protection Agency, Region III

4 Penn Center

1600 John F, Kennedy Blvd.

Mail Code; 3SD21

Philadelphia, PA 19103

Re: Interim Record of Decision (ROD)

Old Wilmington Road Superfund Site

West Cain Township, Chester County

Dear Mr. Leonard:

The Department of Environmental Protection (DEP) has received and reviewed the draft Interim
Record of Decision (ROD) dated March 28, 2023 for the Old Wilmington Road Superfund Site
in West Cain Township, Chester County. This ROD presents the selected remedial action for
Operable Unit 1, which addresses three inter-connected plumes of contaminated groundwater
pose a threat to public health through ingestion and inhalation exposure. The plumes consist of
tetrachloroethene (PCE), trichloroethene (TCE), and 1,4-Dioxane. The area of concern (AOC)
includes properties impacted or potentially impacted by these contaminants of concern (COC).
The selected remedy for Operable Unit 1 includes the following major components:

•	The installation of a newly constructed public waterline and offering to connect all
properties within the AOC;

•	Offer to provide Vapor Intrusion mitigation systems at residences where COC
concentrations in indoor air are detected at levels exceeding cleanup levels for Vapor
Intrusion;

•	Long-term monitoring of the installed Vapor Intrusion mitigation systems to assess the
effectiveness of the systems; and

•	Implementation of Institutional Controls (ICs) to prevent exposure to Site-related
contaminants in groundwater by deterring the use of untreated groundwater at properties
within the AOC, to restrict any impact on the Selected Remedy, and to prevent exposure
to Site-related COCs via Vapor Intrusion through a notification and reporting process
relating to new construction in potentially affected areas.

DEP hereby concurs with EPA's proposed remedy with the following conditions:

•	DEP will be given the opportunity to review and comment on documents and provide
meaningful input regarding decisions related to the design and implementation of the

Southeast Regional Office
2 East Main Street | Norristown, PA 19401-4915 | 484.250.5980 [ Fax 484,250.5981 [ www.dep.pa.gov


-------
Mr. Paul Leonard, Director

- 2 -

April 5, 2023

remedial action, to assure compliance with Pennsylvania's applicable or relevant and
appropriate requirements (ARARs) and to be considered (TBC) requirements.

•	DEP will be given the opportunity to review and comment on documents and provide
meaningful input regarding decisions regarding the ICs, including on which parcels ICs
are required. ICs that implement the Activity and Use Limitations (AULs) may be in the
form of Environmental Covenants (ECs), pursuant the Section 6517(a)(1) of the
Pennsylvania Uniform Environmental Covenants Act (UECA), 27 Pa.C.S. § 6517(a)(1)
or Administrative Orders issued under Section 512(a) of HSCA. When ECs are
implemented, they will need to comply with Section 6517(a)(1) of the UECA, 27 Pa.C.S,
§ 6517(a)(1). In cases where property owners refuse to execute an EC, at EPA's request,
DEP may issue an Administrative Order under Section 512(a) of HSCA, to implement
such restrictions directly. Section 512(a) states that "[a] site at which hazardous
substances remain after completion of a response action shall not be put to a use which
would disturb or be inconsistent with the response action implemented."

•	DEP will have the opportunity to review and comment before any modification to the
ROD in the form of an Amendment or an Explanation of Significant Differences.

•	State cost share atid Operation and Maintenance obligations will be further
clarified during design of the remedy and the completion of a Superfund State

•	EPA will assure that DEP is provided an opportunity to fully participate in any
negotiations with responsible parties.

•	DEP reserves the right and responsibility to. take independent enforcement actions
pursuant to state law.

Thank you for the opportunity to comment and concur on this EPA ROD. If you have any
questions regarding this matter, please do not hesitate to contact me.

Sii

Patrick L. Patterson
Regional Director
Southeast Regional Office

cc: Ms. Shandruk, EPA Region III (electronic)

West Cain Township

Chester County Health Department

Mr. R. Patel (electronic)

Ms, McClennen (electronic)

Ms. Wagner (electronic)

Mr. Cheny (electronic)

Ms, C. McCarthy (electronic)

Re

Contract.


-------