DRAFT
RCRA NATIONAL CORRECTIVE
ACTION PRIORITIZATION SYSTEM
(NCAPS)
VERSION FY 93
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ENVIRONMENTAL PROTECTION AGENCY
TECHNICAL ENFORCEMENT SUPPORT
AT
HAZARDOUS WASTE SITES
TES IV
CONTRACT NO. 68-01-7351
WORK ASSIGNMENT NO. 731
RCRA NATIONAL CORRECTIVE ACTION
PRIORITIZATION SYSTEM GUIDELINES
REVISED
U.S. EPA
JACOBS ENGINEERING GROUP INC.
PROJECT NO. 05-B731-00
PREPARED BY:
ICAIR LIFE SYSTEMS, INC.,
UNDER SUBCONTRACT NO. 05-A005-S-87-006,
ICAIR WORK ASSIGNMENT NO. 601462
MAY 1989
REVISED BY*
PRC ENVIRONMENTAL MANAGEMENT, INC.,
UNDER CONTRACT NO. 68-W9-0006,
WORK ASSIGNMENT NO. R05021
AUGUST 1992
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TABLE OF CONTENTS
Section Page
1.0 INTRODUCTION 1
1.1 BACKGROUND 1
1.2 OBJECTIVE 2
2.0 METHOD FOR SCORING FACILITIES 2
2.1 ROUTES OF POTENTIAL ENVIRONMENTAL CONTAMINATION 2
2.1.1 Ground Water 2
2.1.2 Surface Water 3
2.1.3 Air 3
2.1.4 On Site 3
2.2 RELEASES TO THE ENVIRONMENT 3
2.2.1 Observed Releases 3
2.2.2 Possible Releases 5
2.3 ROUTE CHARACTERISTICS 6
2.4 CONTAINMENT 7
2.5 WASTE CHARACTERISTICS 10
2.5.1 Toxicity and Persistence 10
2.5.2 Waste Quantity 11
2.6 TARGETS 12
2.6.1 Uses of the Medium 12
2.6.2 Distance to Receptors 13
2.6.3 Sensitive Environments 14
3.0 THE COMPUTER ENVIRONMENT 15
4.0 REFERENCES 16
Appendices
A TASK SELECTION MENUS
B DATA INPUT WORKSHEETS AND ALGORITHMS FOR CALCULATING
SCORES
C SAMPLE WORKSHEETS
D ANNUAL PRECIPITATION, EVAPORATION, AND 24-HOUR RAINFALL
MAPS
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LIST OF ACRONYMS
CERCLA Comprehensive Environmental Response, Compensation, and Liability Act
HRS Hazard Ranking System
IRIS Integrated Risk Information System
MCL Maximum Contaminant Level
NCAPS RCRA National Corrective Action Prioritization System
NPDES National Pollutant Discharge Elimination System
NWWA National Water Well Association
PA Preliminary Assessment
PR Preliminary Review
RCRA Resource Conservation and Recovery Act
RFA RCRA Facility Assessment
SWMU Solid Waste Management Unit
TSDF Treatment, Storage, and Disposal Facility
U.S. EPA United States Environmental Protection Agency
USGS United States Geological Survey
UST Underground Storage Tank
VOC Volatile Organic Compound
VSI Visual Site Inspection
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FOREWORD
PRC Environmental Management, Inc. (PRC), has been tasked by the U.S. Environmental
Protection Agency (U.S. EPA) to revise the Resource Conservation and Recovery Act (RCRA)
Corrective Action Prioritization System Guidelines developed for treatment and storage facilities.
The original guidelines were prepared by ICAIR Life Systems, Inc. (ICAIR) for Region 5 under a
TES IV work assignment. Revisions to the guidelines are based on PRC's experience with
implementing the original guidelines and comments received from all ten U.S. EPA regions.
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1.0 INTRODUCTION
This document outlines the guidelines for the Resource Conservation and Recovery Act
(RCRA) National Corrective Action Prioritization System (NCAPS). The system was developed
to help the United States Environmental Protection Agency (U S. EPA) prioritize corrective
action at hazardous waste treatment, storage, and disposal facilities (TSDF) regulated under
RCRA. The Agency expects that refinements will be made to the system based on the operating
experience of U.S. EPA and the authorized States. If such changes are made, this guidance
document will be revised accordingly.
NCAPS is not the only mechanism used by the Agency to set priorities for corrective
action. Other considerations, such as the enforcement history of a facility or the need to address
a facility in the context of a regional environmental initiative (for example, U S. EPA's Great
Lakes Initiative), also play a role in determining which facilities will undertake corrective action
first.
1.1 BACKGROUND
NCAPS is a computer-based system designed to help prioritize the RCRA TSDF universe
for corrective action activities. The system considers many of the same factors as the Superfund
Hazard Ranking System (HRS) (U.S. EPA, 1984) such as the following:
• History of hazardous waste release
• Area hydrogeology
• Routes of continuing and sudden releases
• Waste types and quantities handled
• Likelihood of human and environmental exposure
NCAPS evalutes four migration pathways (ground water, surface water, air, and soil) for
potential or actual contamination in determining the environmental priority for a facility for
corrective action. Each migration pathway is assessed to calculate an environmental priority
ranking of high, medium, or low for each facility.
U.S. EPA will use these rankings in conjunction with other considerations (articulated in
national guidance and RCRA program initiatives) to identify and prioritize RCRA TSDFs for
corrective action. Generally, high NCAPS priority facilities will be candidates for permits or for
orders with cleanup requirements before medium and low NCAPS priority facilities. However, a
facility's NCAPS ranking is not the only factor in determining when it will begin corrective
action. For example, opportunities to minimize significant future impacts by taking a small,
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timely action today at a medium or low NCAPS priority facility can make that facility a high
priority. Thus, in some cases, a medium or low NCAPS priority facility will be evaluated for
more immediate action.
1.2 OBJECTIVE
The objective of this report is to outline the method for scoring and ranking treatment,
storage, and disposal facilities regulated under RCRA. The user's manual for the computerized
system is contained in RCRA Corrective Action Prioritization: Computer System User Guide
(ICAIR, 1989a).
2.0 METHOD FOR SCORING FACILITIES
The HRS scoring algorithm is the foundation of the RCRA prioritization scoring system.
This section discusses three major topics:
1. The potential routes by which human and environmental populations may
contact contaminants at a facility
2. The ranking factors used to evaluate individual routes
3. The values (either qualitative or quantitative) assigned to rating factors
Appendix A displays the menus that appear on the computer screen. Appendix B
contains the format of the worksheets. Appendix C contains two sets of sample worksheets.
Appendix D contains annual precipitation, evaporation, and 24-hour rainfall maps.
2.1 ROUTES OF POTENTIAL ENVIRONMENTAL CONTAMINATION
Four routes of potential contamination are discussed below.
2.1.1 Ground Water
The ground-water migration pathway addresses the likelihood that hazardous constituents
at a site will migrate through the ground and contaminate aquifers. If hazardous constituents
have been released to an aquifer or if site characteristics make a release likely, the principal issue
the ground-water pathway addresses is the impact of releases on ground-water resources and on
people who draw their drinking water from potentially contaminated wells (U.S. EPA, 1988).
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2.1.2
Surface Water
Surface water is defined as perennial and intermittent streams, rivers, and lakes. If
contaminated runoff has reached surface water or if site characteristics make a release to surface
water likely, the system evaluates the potential for such a release to affect people or the
environment. The system includes factors for evaluating flood potential, recreational exposures,
and permitted discharges (U.S. EPA, 1988).
2.1.3 Air
In the HRS, the air pathway is evaluated only if hazardous substances at a site have
escaped into the air either as gases or as particulate matter. In this RCRA prioritization system,
site characteristics are considered to assess the potential for release of hazardous constituents even
if no release has been documented. Once the likelihood of a release has been determined, the
main questions concern whether people or sensitive environments could be exposed to hazardous
substances carried in the air and what inherent hazards are associated with potential exposures
(U.S. EPA, 1988).
2.1.4 On Site
The on-site exposure pathway addresses the possibility that people or sensitive
environments will have direct physical contact with hazardous constituents or contaminated soil.
This system looks at two populations: (1) the nearby residential population that may have access
to a site and (2) sensitive environmental populations (U.S. EPA, 1988).
2.2 RELEASES TO THE ENVIRONMENT
The two types of releases addressed by the system are discussed below.
2.2.1 Observed Releases
Observed releases are defined as documented releases of contaminants to an environmental
medium. The documentation can be obtained from the RCRA Facility Assessment (RFA), the
Preliminary Review/Visual Site Inspection (PR/VSI), the Comprehensive Environmental
Response, Compensation, and Liability Act (CERCLA) Preliminary Assessment (PA) report, or
the Preliminary Assessment/Visual Site Inspection (PA/VSI) report. It can consist of any of the
following information:
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1. Analytical evidence of a contaminant measured in an environmental
medium
2. A report by a regulatory agency or a facility employee stating that a
release has occurred
3. Indirect evidence (for example, fish kills or stressed vegetation)
4. A report by a U.S. EPA site investigator stating that a release is likely to
have occurred
An observed release is the highest possible score for the release and route characteristic
categories. If an observed release is assigned, it is not necessary to evaluate possible releases or to
evaluate route characteristics and containment; therefore, these options are not presented to the
scorer.
Observed releases for each of the four contaminant migration pathways are further
discussed below.
Ground Water
An observed release should be scored when there is documented ground-water
contamination above background levels, above the drinking water maximum contaminant levels
(MCL), or above other health-based numbers [such as those from the Integrated Risk Information
System (IRIS) (U.S. EPA, 1992)] if MCLs are not available.
Surface Water
An observed release should be scored when there is evidence of a direct, unpermitted
discharge of contaminants to surface water. A direct, unpermitted discharge can include such
events as spills, runoff from contaminated soils, or discharge of contaminated ground water.
Discharge of contaminated ground water to a surface water body must be documented. In cases
where ground water communicates with surface water but the ground-water contaminant plume
has not yet reached the surface water, surface water should not be scored with an observed
release.
Air
An observed release should be scored when there is a documented, unpermitted, ongoing
release from a solid waste management unit (SWMU). If there are isolated explosions or fires, an
observed release should not be scored, but the event should be noted in a narrative report.
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On-Site Contamination
Observed soil contamination should be scored when there is sampling information showing
concentrations of contaminants greater than background levels.
Contaminated areas that have been completely excavated or covered by concrete, asphalt,
or at least 2 feet of clean soil should not be scored with observed surface soil contamination.
2.2.2 Possible Releases
Evidence for possible releases includes site investigator observations such as staining on
the ground around storage tanks, damaged diking around surface impoundments, a smell of
solvents, and poor waste management practices at a site.
For the ground-water route, a possible release can be scored if a site contains or once
contained unlined impoundments, unlined landfills, or underground storage tanks (UST) of
unknown integrity. If ground-water quality data show contamination and background levels are
unknown but MCLs or other health-based numbers are not exceeded, a possible release should be
scored. Similarly, if surface or subsurface soil is or was contaminated, a possible release to
ground water should be scored. This category is intended to compensate for inadequacies in
analytical data in a site report and to allow the scorer to interpret site characteristics and apply
professional judgment to the evaluation.
For the surface water route, the score applies to facilities with permits to discharge to
surface waters. The discharge is assumed to have the potential to impact water quality. When
violations of a permit have been documented, the score for a possible release increases.
For the air route, the score applies to facilities with air operating permits. The discharge
to air is assumed to have the potential to impact air quality. Violations of an air permit will
further increase the score. Following is additional guidance for scoring a possible release:
1. If a facility has a permitted discharge of treated wastewater into dry wells,
sinkholes, or basins, assume a possible release for the ground-water route. When
permit violations or unpermitted discharges have been noted, score an observed
release.
2. If a facility had a National Pollutant Discharge Elimination System (NPDES)
permit or a permit violation in the past but does not currently have a permit (for
example, the facility is closed), score these elements.
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3. If a facility has removed all its hazardous waste and materials but reports indicate
that past containment practices were less than very good, score the surface water
route using the past containment rating and the amount of waste contained.
4. If a facility had an air permit or permit violations in the past but does not
currently have a permit, do not score these elements.
5. If residents have complained of odors or if a site investigator has noted odors
while investigating outdoor operations, score the air route for these elements.
2.3 ROUTE CHARACTERISTICS
Route characteristics are intended to measure site-specific factors that influence the
ability of the contaminants to migrate through an environmental medium and reach a receptor.
These characteristics are evaluated when an observed release has not been scored for a particular
route. Route characteristics such as depth to ground water and distance to surface water are
intended to quantify contaminant attenuation and dilution while moving toward a medium.
The location of the facility and 24-hour rainfall categories for the surface water route
quantify the possibility that a flood could cause contaminants to be released. This is an important
factor for sites located in river valleys and other flood-prone areas. If there is no information on
a facility's location, a greater than 100-year flood plain should be assumed. A 24-hour rainfall,
as indicated in the surface water route portion of the RCRA prioritization system scoring
summary (see page B-5), is a 1-year, 24-hour storm. This storm is defined as producing the
maximum amount of rainfall in inches expected to occur once a year over a 24-hour period.
If specific information on 24-hour rainfall or net precipitation is not available, the maps
provided in Appendix D may be used. Net precipitation is defined as the normal annual
precipitation minus the mean annual evaporation.
The site accessibility factor for the on-site exposure route quantifies the ease with which
unauthorized people may enter a site. Access to a site is defined as follows:
• Inaccessible -- A 24-hour surveillance system or barrier (fence,
etc.) is in place with a means to control entry.
• Limited access — There is a less than 24-hour security guard and no
barrier or a fence that is partially open.
• Unlimited access -- There is no barrier and no security guard.
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If a facility is not fenced or under 24-hour surveillance but each SWMU is completely
contained within a controlled-access building or area, access to the site should be scored as
inaccessible. Limited access should be scored for a large military base with an on-site civilian
population, even though access to the base is restricted.
2.4 CONTAINMENT
Containment is a measure of the physical barriers in place that inhibit a waste from
entering the environment. These barriers include dikes, liners, covers, and diversion systems.
This category is rated on a scale ranging from poor (3) to very good (0). A detailed discussion of
the factors that influence the score assigned to the containment category is presented by
U.S. EPA (1984); however, the scale used in this system is intended to allow the scorer to
interpret descriptions contained in site reports. The following criteria and guidance for scoring
containment are provided to aid the scorer.
Ground Water
A. Surface Impoundment Score
Sound runon diversion structure, essentially nonpermeable liner 0
(natural or artificial) compatible with the waste, and adequate
leachate collection system
Essentially nonpermeable compatible liner with no leachate 1
collection system; or inadequate freeboard
Potentially unsound runon diversion structure; or moderately 2
permeable compatible liner
Unsound runon diversion structure; no liner; or incompatible liner 3
B. Container/Tank
Sealed container/tank and sound secondary containment 0
Sealed container/tank and unsound secondary containment; or leaky 1
container/tank and sound containment
Sealed container/tank and no secondary containment; or leaky 2
container/tank and unsound secondary containment
Leaky container/tank and no secondary containment 3
C. Piles
Piles uncovered and waste stabilized; or piles covered, waste
unstabilized, and essentially nonpermeable liner
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Score
Piles uncovered, waste unstabilized, moderately permeable liner,
and leachate collection system
Piles uncovered, waste unstabilized, moderately permeable liner,
and no leachate collection system
Piles uncovered, waste unstabilized, and no liner
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3
D. Landfill
Essentially nonpermeable liner, liner compatible with waste, and 0
adequate leachate collection system
Essentially nonpermeable compatible liner, no leachate collection 1
system, and landfill surface precludes ponding
Moderately permeable compatible liner and landfill surface 2
precludes ponding
No liner or incompatible liner; moderately permeable compatible 3
liner; landfill surface encourages ponding; or no runon control
Additional guidance for scoring containment for the ground-water route are as follows:
Do not consider natural barriers (such as an underlying clay layer) when
evaluating containment.
For a UST where no information is available about tank integrity, assume
that containment is good, and assign a score of 1. A double-walled UST is
considered to have very good containment.
Assume poor containment (a score of 3) for a dry well, sinkhole, or basin
and good containment (a score of 1) for an injection well.
Assume fair containment (a score of 2) for a container/tank storage area
when no information is available.
Surface Water and Qn-Site Contamination
A. Surface Impoundment
Sound diking or diversion structure, adequate freeboard, and no
erosion evident
0
Sound diking or diversion structure but inadequate freeboard
Diking not leaking but potentially unsound
Diking unsound, leaking, or in danger of collapse
2
3
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§C2I£
B. Container/Tank
Sealed container/tank and sound secondary containment
0
Sealed container/tank and unsound secondary containment, or leaky
container/tank and sound containment
Sealed container/tank and no secondary containment; or leaky
container/tank and unsound secondary containment
Leaky container/tank and no secondary containment
2
3
C. Piles
Piles covered and surrounded by sound diversion or containment 0
system
Piles covered, waste unconsolidated, and diversion or containment 1
system inadequate
Piles not covered, waste unconsolidated, and diversion or 2
containment system potentially unsound
Piles not covered, waste unconsolidated, and no diversion or 3
containment system or diversion system leaking or in danger of
collapse
D. Landfill
Landfill slope precludes runoff; landfill surrounded by sound 0
diversion system; or landfill has adequate cover material
Landfill inadequately covered and diversion system sound 1
Landfill not covered and diversion system potentially unsound 2
Landfill not covered and no diversion system present or diversion 3
system unsound
Additional guidance for scoring containment for the surface water route is as follows:
Score containment as poor when contaminated ground water is likely to
discharge to a surface water body.
Also, score containment as poor when contaminated surface soil is likely to
reach a surface water body through surface runoff. If a small amount of
soil contamination is present (for example, a one-time spill of 10 gallons of
a substance has occurred), do not consider the contaminated soil a possible
surface water threat.
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• Assume fair containment (a score of 2) for a container/tank storage area
when no information is available.
Score
Air
Closed container/tank located inside a building
Closed container/tank located in an open area
Open container/tank located inside a building
Open container/tank located in an open area
0
1
2
3
Additional guidance for scoring containment for the air route is as follows:
• If there are any open drums, consider all drums in the storage area to be
open when scoring containment.
• For scoring purposes, score a UST as very good for containment unless
specific information exists to the contrary.
• Assume poor containment for an open, land-based unit (surface
impoundment, landfill, waste pile, etc.). If such a unit is covered, score
containment as very good. If air monitoring data are available and they
indicate an unpermitted release, score the unit an observed release.
• Assume poor containment for contaminated surface soil because fugitive
emissions from the soil may occur. If only a small amount of soil
contamination is present, do not consider the contaminated soil a possible
air threat.
• Assume poor containment for outdoor wastewater treatment plant units.
2.5 WASTE CHARACTERISTICS
Waste toxicity and persistence and waste quantity are discussed below.
2.5.1 Toxicity and Persistence
Values assigned for toxicity and persistence are measures of the potential for a waste
product to cause adverse health effects and to biodegrade in the environment, respectively.
Several measures of toxicity are available (ICAIR, 1988a, b, c). They include reportable
quantities, acceptable intakes, cancer potency factors, and reference doses. The RCRA
prioritization scoring system uses the rankings of Sax (1984). The Sax ratings are used because
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they are simple to apply and because the toxicity values tend to be conservative (ICAIR, 1988a,
b).
The major drawback of using the Sax ratings or any rating system is the lack of specific
information on chemicals present at sites in site reports. These reports tend to identify wastes by
hazardous waste code numbers (for example, F001). When this is the case, the most toxic
chemical included within a group (as identified in 40 CFR 261.31 through 261.33) is used to score
toxicity (ICAIR, 1988b, c, d).
Persistence is a rating of the resistance of a chemical to biodegradation. Chemicals that
biodegrade easily receive lower scores, and metals, polycyclic compounds, and halogenated
hydrocarbons receive higher scores (U.S. EPA, 1984).
Scoring toxicity and persistence requires entering the name of the chemical or the
hazardous waste code number in the space provided. The program assigns the appropriate value
If the chemical is not found in the database, a score will be assigned using the toxicity ratings
found in Sax (1984) and the persistence ratings found in U.S. EPA (1984).
Additional guidance for determining toxicity and persistence scoring elements follows:
1. If monitoring well data identify a number of contaminants, use the most toxic
contaminant for toxicity. Do not consider concentrations of contaminants.
Similarly, when selecting a contaminant for entry into the toxicity and persistence
scoring element, select the most toxic contaminant, not the one that may be
present in the greatest volume. However, the contaminant used should be at a
SWMU that has a containment score greater than zero. Follow the same basic
approach when selecting contaminants for the surface water, air, and on-site
routes.
2. If there is an observed release and the chemical found in the medium of concern
is not the most toxic chemical at the site, the site should be scored for the
chemical found in the medium and not for a more toxic chemical.
2.5.2 Waste Quantity
The value entered for waste quantity is the amount of waste capable of migrating through
the route being evaluated. For example, volatiles or particulates can be used for the air route.
Wastes in USTs can be counted for the ground-water route, but they cannot be counted for the
air or surface water route. If a site has multiple SWMUs and no observed release is assigned, the
value entered for waste quantity should be the total amount of waste in all SWMUs that is capable
of migrating to the exposure pathway (add all wastes with non-zero containment values). Actual
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or allowable (maximum) inventory should be used. The RCRA Part A permit application,
capacity of the tank, permitted drum storage capacity, and other available information should be
checked. If an observed release is assigned, the value entered for waste quantity should be only
the amount of waste actually released.
Many site reports do not consistently specify the quantity of hazardous waste present.
The computer program will ask the scorer if the quantity is known. If it is, the scorer can enter
the amount; if it is not, the scorer can assign a value based on a judgment that the quantity is
likely to be small, likely to be large, or likely to be very large. The judgment should reflect the
size of the storage and disposal areas. Following is specific estimating guidance for the scorer to
use if the waste quantity is unknown:
• Small amount <10 cubic yards
• Large amount 100 - 1,000 cubic yards
• Large storage or disposal area >2,500 cubic yards
Generally a small amount should be assumed for the following situations:
1. Contaminated ground water discharges (or is likely to discharge) to surface water.
2. Contaminated soil is likely to reach surface water through surface runoff.
3. Contaminated soil is a concern for the air route because of fugitive emissions.
4. Open tanks or impoundments may contain wastewater. Typically wastewater
contains volatile organic compounds (VOC) in small amounts, and the amount of
VOCs likely to be evaporated is very small.
2.6 TARGETS
Targets are defined as the populations that can be affected by actual or potential releases
from a site. No quantification of the size of the population is considered in the system. The fact
that a single person is or may be affected is sufficient to assign a value.
2.6.1 Uses of the Medium
Because the size of the population potentially affected by releases is not evaluated, the
specific uses of the medium are important. For the ground-water and surface water routes, water
can be used for residential, industrial, agricultural, and recreational purposes. Even if ground
water and surface water are not currently used by human populations, actual or potential releases
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could adversely affect environmental populations and could preclude future uses by humans. For
the air and on-site routes, the proximity of residential populations is the critical factor evaluated.
Residents are considered the most sensitive human population potentially exposed.
Surface water can be used as a drinking water supply but is more likely to be evaluated
for such recreational uses as fishing, swimming, and boating. When a facility is located in a
community adjacent to any of the Great Lakes, the community is assumed to obtain its residential
water supply from the lake unless information to the contrary is available. Intakes are assumed to
be over 3 miles from the shore. This assumption is based solely on data obtained from the City
of Cleveland, Ohio. The city has four water intakes in Lake Erie, all of which are between 3 and
5 miles from the shore. This is a simplifying assumption and may not be true for every
community on the Great Lakes. Additional guidance follows for determining use where there is
a lack of specific information:
1. "Drinking water" indicates previously used, presently used, or likely to be
used in the future for drinking water.
2. If there is no documented use of the ground water, assume possible
drinking water use unless specific information is available to refute the
assumption (for example, there is industrial use or the aquifer is unusable
because of its low yield).
3. Only score "quality impacted" if the aquifer is contaminated and if it could
never be used as a drinking water aquifer (because of natural conditions
such as low yield or high total dissolved solids).
4. If both a perched aquifer and a main aquifer exist, assume that there is
one aquifer unless an absolute aquitard exists between the two aquifers.
The presence of the aquitard should be established by a hydrogeologic
investigation. Generally, assume that upper and lower aquifers are
hydraulically connected.
5. If there is no information on the use of a river or stream, assume use for
recreation.
2.6.2 Distance to Receptors
The distance to intakes or contact points is measured from the location of the hazardous
substances to the potential contact point (for example, a ground-water well, surface water intake,
recreational area, or residence). For the ground-water pathway, if there is a documented
contaminant plume off site, the distance to an intake should be measured from the edge of the
plume instead of from the property boundary. The rating factor decreases with increasing
distance to simulate dilution of a contaminant as it passes through a medium. If the ground-
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water flow direction is known, upgradient wells should not be considered receptors and therefore
should not be factored into the ground-water route score.
Additional guidance follows for determining distances between a source and potential
receptors:
1. If the distance to the nearest well is unknown, use the distance between
the hazardous constituents and the nearest residential area where ground
water is used for drinking water.
2. If there is no documented use of the ground water, assign 2 to 3 miles for
the distance to the intake. This will account for potential future use.
3. If there is no information on the use of a surface water body receiving a
discharge from a facility, the distance to the contact point should be the
distance from the facility to the nearest point of the surface water body.
4. If surface water is discharged to a stream or river through a ditch, use the
distance to the stream or river as the distance to surface water. Do not use
the distance to the ditch.
5. The computer program does not allow two decimal places for the distance
to a target for the ground-water, surface water, and air routes. Therefore,
the distance to a target should be rounded down to one decimal place. For
example, if the distance to a ground-water intake is 0.49 mile, 0.4 should
be used. This will provide a score of 4. Use of 0.5 mile would provide a
score of 3 (see page B-3).
A United States Geological Survey (USGS) map can be used to identify wetlands,
streams, rivers, and residential areas and the distance of these contacts from the facility.
2.6.3 Sensitive Environments
Sensitive environmental areas such as national or state parks, critical habitats, fresh water
wetlands (greater than 2 acres in size), and wildlife preserves are evaluated separately from the
human use categories. These areas may contain important biological resources or fragile natural
settings that could suffer severe impacts from facility releases (U.S. EPA, 1984). Areas in which
federal- or state-designated endangered species may reside (for example, during migratory
periods) are also considered sensitive environments.
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3.0 THE COMPUTER ENVIRONMENT
The computer environment for the RCRA prioritization scoring system is designed to be
easy to operate and to integrate with systems available to U.S. EPA personnel. Accordingly, the
following specifications have been incorporated into the system:
1. The RCRA prioritization scoring system is designed to run on an IBM AT
or equivalent system.
2. The scoring system is designed to operate in a manner similar to the HRS
Score Verification and Retrieval System (NUS, 1986).
3. The scoring system is menu-driven and prompts the scorer when an input
value is required or when a value entered is inappropriate.
4. A stand-alone, executable program is provided that uses the dBase III
system. The program can support a network of users.
5. A user's manual and software documentation package are available.
6. The software is designed to facilitate future updates. Because the scoring
will take place over a 3-year period, experience may suggest future
changes to improve the scoring system.
1
PRC made minor modifications to the software for the air and on-site routes.
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4.0 REFERENCES
ICAIR, 1988a. Interdisciplinary Consulting and Information Research. Minutes of planning
meeting, May 16, 1988. Cleveland, OH: ICAIR, Life Systems. Jacobs Engineering
Group Inc. Subcontract No. 05-A005-S-87-0006. TR-913-79.
ICAIR, 1988b. Interdisciplinary Consulting and Information Research. Minutes of review
meeting, August 25, 1988. Cleveland, OH: ICAIR, Life Systems. Jacobs Engineering
Group Inc. Subcontract No. 05-A005-S-87-0006. TR-913-83.
ICAIR, 1988c. Interdisciplinary Consulting and Information Research. RCRA prioritization
scoring guidelines. Cleveland, OH: ICAIR, Life Systems. Jacobs Engineering Group Inc.
Subcontract No. 05-A005-S-87-0006. TR-913-81.
ICAIR, 1988d. Interdisciplinary Consulting and Information Research. Summary of RCRA
prioritization scores. Cleveland, OH: ICAIR, Life Systems. Jacobs Engineering Group
Inc. Subcontract No. 05-A005-S-87-0006. TR-913-69.
ICAIR, 1989a. Interdisciplinary Consulting and Information Research. Computer system user's
guide. Cleveland, OH: ICAIR, Life Systems. Jacobs Engineering Group Inc. Subcontract
No. 05-A005-S-87-0006. TR-913-114.
ICAIR, 1989b. Interdisciplinary Consulting and Information Research. Guidelines for a
computerized RCRA prioritization scoring system. Cleveland, OH: ICAIR, Life Systems.
Jacobs Engineering Group Inc. Subcontract No. 05-A005-S-87-0006. TR-913-109A.
NUS, 1986. NUS Corporation, Superfund Division. HRS score verification and retrieval system
user's manual, version 2.0. Pittsburgh, PA: NUS Corporation, July 15.
Sax, NI, 1984. Dangerous properties of hazardous materials. Sixth edition. New York, NY: Van
Nostrand Reinhold Company.
U.S. EPA, 1984. U.S. Environmental Protection Agency. Uncontrolled hazardous waste site
ranking systems. A user's manual (HW-10). Washington, D.C.: U.S. Environmental
Protection Agency.
U.S. EPA, 1988. U.S. Environmental Protection Agency. Office of Emergency and Remedial
Response. Hazardous ranking system for uncontrolled hazardous substance releases;
Appendix A of the national oil and hazardous substances contingency plan; Proposed rule.
Federal Register, December 23, 1988, 53 51962-52081.
U.S. EPA, 1992. U.S. Environmental Protection Agency. Integrated Risk Information System
(IRIS) On-Line Database.
16
-------
APPENDIX A
TASK SELECTION MENUS
-------
MAIN MENU
1. Data Entry
2. Data Retrieval
3. System Maintenance by User
4. System Maintenance by DB Manager
5. End this session
A-l
-------
DATA ENTRY MENU
1. Enter new data
2. Modify existing data
3. Duplicate a site's data
4. Return to Main Menu
5. End this session
A-2
-------
DATA RETRIEVAL MENU
1. Print a site data record
2. Review a site data record
3. Print a summary table
4. Review all site scores
5. Return to Main Menu
6. End this session
A-3
-------
SUMMARY TABLE
(Example)
Rank
1
Site Name
ID No
Acme Chemical
OHD 123456789
Baker Disposal
OHD9876S4321
Location
Akron, OH
Canton, OH
Total
Site Score
42 99
26 58
Ground Water
Route Score
26 83"
29 02
Surface Water
Route Score
71 31
43 13"
Air Route
Score
39 84"
0 0
On-Site
Score
0 0
11 11
Note:
a An observed release was scored for this route.
A-4
-------
SYSTEM MAINTENANCE BY USER MENU
1. Print list of toxicity/persistence values
2. Write a site to diskette
3. Read a site from diskette
4. Return to Main Menu
5. End this session
A-5
-------
SYSTEM MAINTENANCE BY DB MANAGER
1.
Add toxicity/persistence values
2.
Revise toxicity/persistence values
3.
Delete a toxicity/persistence value
4.
Delete a site
5.
Write all sites to diskette
6.
Change passwords
7.
Return to Main Menu
8.
End this session
A-6
-------
APPENDIX B
DATA INPUT WORKSHEETS AND ALGORITHMS
FOR CALCULATING SCORES
-------
APPENDIX B
DATA INPUT WORKSHEETS AND ALGORITHMS
FOR CALCULATING SCORES
The following data worksheets allow the scorer to input information or select appropriate
values for rating factors The numbers in parentheses on the worksheets are the values assigned
to the rating factor evaluated. They will not appear on the screen viewed by the scorer.
When a rating factor does not need to be evaluated, it will not be presented to the scorer.
For example, if an observed release to the ground-water route is assigned, it is not necessary to
evaluate the Route Characteristics or the Containment sections and the program will proceed
directly to the Waste Characteristics section.
The pages that describe the method for calculating the scores will be an internal program
function. They are shown here for discussion purposes only. The methods for performing the
calculations are presented in the computer system User's Guide (ICAIR, 1989a) and are not
presented or accessible to the scorer.
PRC has revised the data input worksheets for the air route and the on-site route.
B-l
-------
RCRA PRIORITIZATION SYSTEM SCORING SUMMARY
FOR
(Name of Facility)
EPA SITE NUMBER: (Number)
(City . (State)
SCORED BY: (Name)
OF (Organization)
ON (Date)
GROUND WATER ROUTE SCORE . (SCORE)
SURFACE WATER ROUTE SCORE: (SCORE)
AIR ROUTE SCORE (SCORE)
ON-SITE SCORE (SCORE)
MIGRATION SCORE (SCORE)
B-2
-------
WS-1 GROUND WATER ROUTE
B.
D.
Is there an observed release?
Route Characteristics
lb. Depth to Aquifer (ft.)
2b. Net Precipitation (in.)
3b. Physical State
Containment
Yes
(45)
0-20
(6)
<=ia
(0)
No Possible
(0) (10)
21-75 76-150 150+
(4) (2)
-10 to +5
(2)
Stable Unstable
Solid Solid
(0)
(1)
Very Good
(0)
(0)
> +5 to +15
(4)
Powder,
Ash
(2)
Good Fair
(1) (2)
Poor
(3)
Waste Characteristics
Id. Chemical name or waste code number
2d. Toxicity/Persistence Value
JL
(0)
(3)
3d. Quantity known?
Yes?
Yes No
Enter amount. Cu yds or tons (#)
Drums (#) (* 4 = cu yds)
Total
(add above)
Nfi?
> + 15.
(6)
Liquid, Gas
Sludge
(3)
(Name or Number^
6 9 12
(6) (9) (12)
_LL
(15)
Is amount likely to be small Yes (1) No
Is amount likely to be large? Yes (4) No
Are large storage or disposal areas present? Yes (8) No
(only one yes allowed)
Targets
18
(18)
le.
Groundwater use: Drinking water?
Yes (5)
No
Possible drinking water?
Yes (4)
No
Agriculture or industrial?
Yes (3)
No
Quality impacted?
Yes (2)
No
Quality not impacted?
Yes (Of
No
(only one yes allowed)
2e.
Distance to intake (miles) <1/2 1/2 to 1
>1 to 2 >2 to 3 >
3
(4) (3)
(2) (1)
(0)
Note:
* Cannot be used if A = 45
B-3
-------
CALCULATE GROUND WATER SCORE (S^J
If A = 45, then Sau equals: A x (2d + 3d) x (lez + 2ez) = S (a)
3 479.7 9
If A = 0 or 10, then Sgw equals:
[ (lb + 2b + 3b) xc]+A = Q if Q >45, then Q = 45
Q x (2d + 3d) x (le2 + 2e2) / 479.7 = Sgw
To calculate 3d:
If Total Equals Then 3d Equals
I to 10 cu yds 1
II to 62 2
63 to 125 3
126 to 250 4
251 to 625 5
626 to 1,250 6
1,251 to 2,500 7
2,500 or more 8
If A = 45, then go to D and E
If A = 0 or 10, then go to B, C, D, and E
Note:
a The value 479.7 standardizes the ground water route score to a value between 0 and 100.
B-4
-------
WS-2 SURFACE WATER ROUTE
Releases
la.
Is there an observed release?
Yes
No
(45)
(0)
2a.
Is there a permitted outfall?
Yes
Nfi
(5)
(0)
3a.
Have there been permit violations?
Yes
No
(5)
(0)
Route Characteristics
lb.
Flood-Prone 100-year
(3) (2)
(1)
2b. 24-hour Rainfall (in.)
<1.0 1.0 to 2 0
(0) (1)
2 1 to 3 0
(2)
3b. Distance to surface
water (miles)
< 1/4 >1/4 to I
(6) (4)
>1 to 2
(2)
4b. Physical State
Stable Unstable
Solid Solid
Powder,
Ash
(0) (1)
(2)
Containment
Verv Good Good
Fair Poor
(0)
Waste Characteristics
Id. Chemical name or waste code number
2d. Toxicity/Persistence Value
JL
(0)
JL
(3)
3d.
Quantity known? Ygj No
Yes? Enter amount: Cu yds or tons (#1
Drums
Total
(#) (+ 4 = cu yds)
(add above)
Nfi?
> 30
(3)
> _2
(0)
Liquid, Gas
Sludge
(3)
(1) (2) (3)
(Name or Number)
6 9 12
(6) (9) (12)
15
(15)
18
(18)
Is amount likely to be small Yes(l) No
Is amount likely to be large7 Yes (4) No
Are large storage or disposal areas present? Yes (8) No
(only one yes allowed)
B-5
-------
SURFACE WATER ROUTE - Continued
E. Targets
le. Surface Water use:
Drinking water?
Yes
(5)
No
Possible drinking water?
Yes
(4)
No
Recreation9
Yes
(4)
No
Agriculture or industrial?
Yes
(3)
No
Quality impacted?
Yes
(2)
No
Quality not impacted
but within 3 miles9
Yes
0)*
No
None within 3 miles?
Yes
('o)*
No
(only one
yes allowed)
2e.
Distance to intake or
<\J1
1/2 \q 1
>1 to 2
>2 to 3
V
ft
*
contact point (miles)
(4)
(3)
(2)
(1)
(0)
3e.
Distance to sensitive
< 112.
1/2 to 1
>1 to 2
> 2
environment (miles)
(6)
(4)
(2)
(0)
Note:
*
**
Cannot be used if A = 45
If the distance to a drinking water intake is greater than 10 miles, do not assign drinking
water as a surface water use. Assign another applicable use, such as recreation, and its
associated distance to intake or contact point.
B-6
-------
CALCULATE SURFACE WATER SCORE (S8J
If la = 45, then Ssw equals: la x (2d + 3d) x (le2 + 2e2 + 3e) / 549.9 = Ssw(a)
If la = 0, then Ssw equals:
[ (lb + 2b + 3b + 4b) x C ] + (2a + 3a) = Q if Q >45, then Q = 45
Q x (2d + 3d) x (le2 + 2e2 + 3e) / 549.9 = Ssw
To calculate 3d:
If Total Equals Then 3d Equals
I to 10 cu yds 1
II to 62 2
63 to 125 3
126 to 250 4
251 to 625 5
626 to 1,250 6
1,251 to 2,500 7
2,500 or more 8
If A = 45, then go to D and E
If A = 0 or 10, then go to B, C, D, and E
Note:
a The value of 549.9 standardizes the surface water route score to a value between 0 and
100.
B-7
-------
WS-3 AIR ROUTE
A.
Releases
B.
C.
la.
Is there an observed, unpermitted, ongoing release?
Yes
(45)
No
(0)
2a.
Does the facility have an air operating permit?
Yes
(5)
Nfi
(0)
3a.
Have there been any permit violations or odor
complaints by residents?
Yes
(10)
Nfl
(0)
4a.
Can contaminants migrate into air?
Yes
(3)
Nfl
(0)
5a.
Containment Verv Good
(0)
Good
(1)
Fair
(2)
Poor
(3)
Waste Characteristics
lb. Chemical name or waste code number
2b. Toxicity
_0_
(0)
_L
(3)
(6)
3b.
Quantity known?
Yes? Enter amount:
Name or Number
(9)
Yes No
Cubic yards or tons
Drums
Total
Targets
lc. Population
Are residences located within four miles?
Are other industries located within four miles?
Are agricultural lands located within four miles?
Any other situation.
2c. Distance to sensitive environments (miles)
<1/2 1/2 to 1
(6) (4)
> 1 to 2
(2)
>_2
(0)
1#L
I#L
(+ 4 = cu. yds.)
(add above>
No? Is amount likely to be small?
Is amount likely to be large?
Are large storage or disposal areas present?
Yes (1)
Yes (4)
Yes (8)
(only one yes
No
No
No
allowed)
Yes (25)
Yes (20)
Yes (15)
Yes (10)
(only one yes
No
No
No
No
allowed)
B-8
-------
CALCULATE AIR SCORE (S )
If la = 45, then A = 45
If la = 0, then A = (2a + 3a) + (4a x 5a)
Sa equals: A x (2b + 3b) x (lc + 2c) / 237 15
To calculate 3b:
If Total Equals
1 to 10 cu. yds
II to 62 cu. yds
63 to 125 cu. yds
126 to 250 cu. yds
251 to 625 cu. yds
626 to 1,250 cu. yds
1,251 to 2,500 cu. yds
2,500 or more cu. yds
The value 237.15 standardizes the air route score to a value between 0 and 100.
B-9
= S
Then 3b Eouals
1
2
3
4
5
6
7
8
-------
WS-4 ON-SITE CONTAMINATION
A. Access to site
Inaccessible Limited Access
(0) (2)
Unlimited Access
(4)
B.
Is there observed surface soil contamination''
Yes No
(25) (0)
C. Containment
Very Good Good Fair Poor
(1) (2) (3) (4)
D. Waste characteristics
Chemical Name or Waste Code Number
Toxicity/Persistence Value
E. Targets
le. Distance to residential areas
JL J_ _2_ _L
(0) (1) (2) (3)
< 1/4 > 1/4 to 1/2 > 1/2 to 1 >J.
(6) (4) (2) (0)
2e. Is there on-site sensitive environment?
Yes No
(1) (0)
CALCULATE ON-SITE SCORE (SQ)
If A = 0, then S0 = B x D x (le + 2e)/21
If A ^ 0, then S0 = A x (B + C) x D x (le + 2e)/21
If B + C > 25, then B + C = 25
The value 21 standardizes the on-site route score to a value between 0 and 100.
B-10
-------
CALCULATE TOTAL SITE MIGRATION SCORE (S )
Total site score equals:
S = J S 2+S 2+S2+S2/ 2 The value 2 standardizes the site migration score to a value between 0 and 100.
B-ll
-------
APPENDIX C
SAMPLE WORKSHEETS
-------
The following sample worksheets were prepared by PRC and replace the sample
worksheet provided by ICAIR Life Systems, Inc., in the original document.
C-l
-------
RCRA PRIORITIZATION SYSTEM SCORING SUMMARY
FOR
ABC CORPORATION
EPA SITE NUMBER: MID 123456789
DETROIT, MI
SCORED BY: J. MYHRA
OF PRC EMI
ON 06/26/92
GROUNDWATER SCORE 96.15
SURFACE WATER SCORE: 40.01
AIR ROUTE SCORE : 20.03
ONSITE SCORE : 85.71
MIGRATION SCORE 68.18
C-2
-------
EPA ID NO. . MID 123456789
ABC CORPORATION
WS-1 GROUNDWATER ROUTE
IS THERE AN OBSERVED RELEASE? Y
ROUTE CHARACTERISTICS
DEPTH TO AQUIFER (FT.) : NA
NET PRECIPITATION (IN.) : NA
PHYSICAL STATE: NA
CONTAINMENT:
WASTE CHARACTERISTICS
CHEMICAL NAME OR WASTE CODE NUMBER: ARSENIC
TOXICITY/PERSISTANCE VALUE: 18
QUANTITY KNOWN? YES
CUBIC YARDS OR TONS: 1500
DRUMS : 0
TARGETS
GROUNDWATER USE: DRINKING WATER
DISTANCE TO WELL (MILES): 0.4
C-3
-------
EPA ID NO. : MID 123456789
ABC CORPORATION
WS-2 SURFACE WATER ROUTE
RELEASES
IS THERE AN OBSERVED RELEASE? N
IS THERE A PERMITTED OUTFALL? Y
HAVE THERE BEEN PERMIT VIOLATIONS? Y
ROUTE CHARACTERISTICS
FACILITY LOCATION: OTHER
24-HOUR RAINFALL: 2.5
DISTANCE TO SURFACE WATER (MILES): 0.50
PHYSICAL STATE: LIQUID, GAS, SLUDGE
CONTAINMENT: POOR
WASTE CHARACTERISTICS
CHEMICAL NAME OR WASTE CODE NUMBER- NICKEL, HEXAVALENT CHROMIUM
TOXICITY/PERSISTANCE VALUE: 18
QUANTITY KNOWN? NO
CUBIC YARDS OR TONS: 0
DRUMS 0
AMOUNT IS LIKELY TO BE LARGE
TARGETS
SURFACE WATER USE: POSSIBLE DRINKING WATER OR RECREATION
DISTANCE TO INTAKE OR CONTACT POINT (MILES): 0.7
DISTANCE TO SENSITIVE ENVIRONMENT (MILES): 3.0
-------
EPA ID NO. MID 123456789
ABC CORPORATION
WS-3 AIR ROUTE
RELEASES
IS THERE AN OBSERVED, UNPERMITTED, ON-GOING RELEASE? N
DOES THE FACILITY HAVE AN AIR OPERATING PERMIT(S)? N
HAVE THERE BEEN ANY PERMIT VIOLATIONS OR ODOR COMPLAINTS BY RESIDENTS
CAN CONTAMINANTS MIGRATE INTO AIR? Y
CONTAINMENT: POOR
WASTE CHARACTERISTICS
CHEMICAL NAME OR WASTE CODE NUMBER: ARSENIC/CHROMIUM
TOXICITY/PERSISTANCE VALUE: 3
QUANTITY KNOWN? NO
CUBIC YARDS OR TONS: 0
DRUMS 0
AMOUNT IS LIKELY TO BE SMALL
TARGETS
POPULATION: RESIDENCES ARE LOCATED WITHIN FOUR MILES
DISTANCE TO SENSITIVE ENVIRONMENT (MILES): 3.0
-------
EPA ID NO. : MID 123456789
ABC CORPORATION
WS-4 ON SITE CONTAMINATION
ACCESS TO SITE: UNLIMITED ACCESS
IS THERE AN OBSERVED SURFACE SOIL CONTAMINATION? Y
CONTAINMENT: POOR
WASTE CHARACTERISTICS
CHEMICAL NAME OR WASTE CODE NUMBER: ARSENIC/CHROMIUM
TOXICITY/PERSISTANCE VALUE: 3
TARGETS
DISTANCE TO RESIDENTIAL AREAS (MILES): 0.20
IS THERE AN ON-SITE SENSITIVE ENVIRONMENT: N
C-6
-------
RCRA PRIORITIZATION SYSTEM SCORING SUMMARY
FOR
XYZ COMPANY
EPA SITE NUMBER: ILD 012345678
CHICAGO, IL
SCORED BY: DEB HARRITY
OF PRC EMI
ON 06/05/92
GROUNDWATER SCORE : 100.00
SURFACE WATER SCORE: 68.41
AIR ROUTE SCORE 27.45
ONSITE SCORE : 8.00
MIGRATION SCORE 62.24
C-7
-------
EPA ID NO. : ILD 012345678
XYZ COMPANY
WS-1 GROUNDWATER ROUTE
IS THERE AN OBSERVED RELEASE? Y
ROUTE CHARACTERISTICS
DEPTH TO AQUIFER (FT.) : NA
NET PRECIPITATION (IN.) : NA
PHYSICAL STATE: NA
CONTAINMENT:
WASTE CHARACTERISTICS
CHEMICAL NAME OR WASTE CODE NUMBER: PCBS
TOXICITY/PERSISTANCE VALUE: 18
QUANTITY KNOWN? NO
CUBIC YARDS OR TONS: 0
DRUMS : 0
LARGE STORAGE OR DISPOSAL AREAS ARE PRESENT
TARGETS
GROUNDWATER USE: DRINKING WATER
DISTANCE TO WELL (MILES): 0.4
C-8
-------
EPA ID NO. : ILD 012345678
XYZ COMPANY
WS-2 SURFACE WATER ROUTE
RELEASES
IS THERE AN OBSERVED RELEASE? Y
IS THERE A PERMITTED OUTFALL?
HAVE THERE BEEN PERMIT VIOLATIONS?
ROUTE CHARACTERISTICS
FACILITY LOCATION: NA
24-HOUR RAINFALL: NA
DISTANCE TO SURFACE WATER (MILES): NA
PHYSICAL STATE: NA
CONTAINMENT: NA
WASTE CHARACTERISTICS
CHEMICAL NAME OR WASTE CODE NUMBER: PCBS
TOXICITY/PERSISTANCE VALUE: 18
QUANTITY KNOWN? NO
CUBIC YARDS OR TONS: 0
DRUMS 0
AMOUNT IS LIKELY TO BE LARGE
TARGETS
SURFACE WATER USE: POSSIBLE DRINKING WATER OR RECREATION
DISTANCE TO INTAKE OR CONTACT POINT (MILES): 0.4
DISTANCE TO SENSITIVE ENVIRONMENT (MILES): 0.4
C-9
-------
EPA ID NO. ILD 012345678
XYZ COMPANY
WS-3 AIR ROUTE
RELEASES
IS THERE AN OBSERVED, UNPERMITTED, ON-GOING RELEASE? N
DOES THE FACILITY HAVE AN AIR OPERATING PERMIT(S)? Y
HAVE THERE BEEN ANY PERMIT VIOLATIONS OR ODOR COMPLAINTS BY RESIDENTS? Y
CAN CONTAMINANTS MIGRATE INTO AIR? Y
CONTAINMENT: FAIR
WASTE CHARACTERISTICS
CHEMICAL NAME OR WASTE CODE NUMBER: D001, F00I
TOXICITY/PERSISTANCE VALUE: 3
QUANTITY KNOWN? NO
CUBIC YARDS OR TONS: 0
DRUMS 0
AMOUNT IS LIKELY TO BE SMALL
TARGETS
POPULATION: RESIDENCES ARE LOCATED WITHIN FOUR MILES
DISTANCE TO SENSITIVE ENVIRONMENT (MILES): 0.4
C-10
-------
EPA ID NO. : ILD 012345678
XYZ COMPANY
WS-4 ON SITE CONTAMINATION
ACCESS TO SITE: LIMITED ACCESS
IS THERE AN OBSERVED SURFACE SOIL CONTAMINATION? N
CONTAINMENT: POOR
WASTE CHARACTERISTICS
CHEMICAL NAME OR WASTE CODE NUMBER: D001, F001
TOXICITY/PERSISTANCE VALUE: 3
TARGETS
DISTANCE TO RESIDENTIAL AREAS (MILES): 0.20
IS THERE AN ON-SITE SENSITIVE ENVIRONMENT: Y
C-ll
-------
APPENDIX D
ANNUAL PRECIPITATION, EVAPORATION, AND
24-HOUR RAINFALL MAPS
-------
PAGE NOT
AVAILABLE
DIGITALLY
------- |