Fourth Five-Year Review Report For
Peoples Natural Gas
Dubuque, Iowa
December 2015
Prepared By:
U. S. Environmental Protection Agency
Region 7
Lenexa, Kansas
Director, Superfund Division
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Table of Contents
List of Abbreviations .. . v
Executive Summary vi
Five-Year Review Summary Form vii
1.0 Introduction 1
2.0 Site Chronology.... 2
3.0 Background .. ....3
3.1 Physical Characteristics 3
3.2 Land and Resource Use . 3
3.3 History of Contamination 4
3.4 Initial Response 5
3.5 Basis for Taking Action 5
4.0 Remedial Actions 5
4.1 Remedy Selection 5
4.2 Remedy Implementation 6
4.3 System Operations/Operation and Maintenance 7
5.0 Progress Since the Last Review 11
6.0 Five-Year Review Process 13
6.1 Administrative Components ....13
6.2 Community Involvement 13
6.3 Document Review 13
6.4 Data Review 13
6.5 Site Inspection 20
7.0 Technical Assessment .20
7.1 Question A: Is the remedy functioning as intended by the decision documents? 20
7.2 Question B: Are the exposure assumptions, toxicity data, cleanup levels, and
remedial action objectives (RAOs) used at the time of the remedy selection still
valid? 22
7.3 Question C: Has any other information come to light that could call into question
the protectiveness of the remedy? 27
7.4 Technical Assessment Summary 28
8.0 Issues and Recommendations 29
9.0 Protectiveness Statement ...30
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10.0 Next Review
30
Tables
Table 1 - Chronology of Site Events
Table 2 - Groundwater Cleanup Levels in 2013 ROD Amendment
Table 3 - Comparison of 2013 Groundwater Cleanup Levels to Current Tapwater RSL Values
Table 4 - Comparison of Groundwater Concentrations to Ecological Screening Levels for
Surface Water
Figures
Figure 1 - Site Map
Figure 2 - Conceptual Model Cross-Section
Figure 3 - Topographic Surface of the Lower Confining Unit
Figure 4 - Hydraulic Containment System Layout
Figure 5 - Groundwater Flow Direction Water Table Aquifer October 20, 2014
Figure 6 - Groundwater Flow Direction Silty Sand Aquifer March 24, 2104
Figure 7 - Groundwater Flow Direction Silty Sand Aquifer October 20, 2014
Figure 8 - Groundwater Row Direction Alluvial Aquifer October 20, 2014
Figure 9 - Extent of DNAPL
Attachments
Attachment 1 - Documents Reviewed
Attachment 2 - Groundwater Analytical Results
Attachment 3 - Site Inspection Report
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List of Abbreviations
[xg/m3
Micrograms per cubic meter
M-g/L
Micrograms per liter
ARARs
Applicable or relevant and appropriate requirements
BETX
Benzene, ethylbenzene, toluene and xylenes
bgs
Below ground surface
CERCLA
Comprehensive Environmental Response, Compensation and Liability Act
cPAH
Carcinogenic polynuclear aromatic hydrocarbon
COC
Contaminant of concern
DNAPL
Dense nonaqueous phase liquid
EPA
U.S. Environmental Protection Agency
ESD
Explanation of Significant Differences
HQ
U.S. EPA Headquarters
IDNR
Iowa Department of Natural Resources
IDOT
Iowa Department of Transportation
LCU
Lower confining unit
LUST
Leaking Underground Storage Tank
MCL
Maximum Contaminant Level
mg/kg
Milligrams per kilogram
NCP
National Contingency Plan
NPL
National Priority List
OU
Operable Unit
PAH
Polynuclear aromatic hydrocarbon
PQL
Practical Quantitation Limit
RAO
Remedial action objective
RD/RA
Remedial Design/Remedial Action
RI/FS
Remedial Investigation/Feasibility Study
ROD
Record of Decision
RSL
Regional screening level
SIM
Selected ion monitoring
TarGOST™
Tar-Specific Green Optical Screening Tool
TI
Technical impracticability
tPAH
Total polynuclear aromatic hydrocarbons
UCL
Upper confidence limit
ucu
Upper confining unit
VOC
Volatile organic compound
V
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Executive Summary
The Peoples Natural Gas Superfund site is at the location of a former manufactured gas plant near East
11th Street and Kerper Boulevard in Dubuque, Iowa. The western portion of the Site has a section of
U.S. Highway 61 constructed on it. The construction occurred following completion of a removal action
to remove contaminated soil. The eastern portion of the Site is currently occupied by the city of
Dubuque's former public works garage. The remedy for the Site included excavation and incineration of
contaminated soil, extraction and treatment of groundwater, groundwater monitoring, and ozone
sparging in the source area to enhance remediation of residual source contamination in the subsurface.
This remedy was modified by a Record of Decision Amendment signed in September 2013 to address
the contaminated groundwater. The selected amended remedy included a hydraulic containment system
to capture the leading edge of the plume and a technical impracticability applicable or relevant and
appropriate requirements (ARAR) waiver for a portion of the silty sand aquifer where cleanup levels
will not be able to be achieved. Expansion and improvements of the institutional controls on the Site
were also part of the amended remedy. The trigger for this five-year review was the signing of the Third
Five-Year Review Report on July 22, 2010.
Excavation and incineration of contaminated soil was completed in 1998. The ozone sparging system
ceased operation in October 2002, when it was determined that the potential reductions in contaminant
levels in the silty sand aquifer that would result from continued operation of the system were negligible
compared to the cost of operation. Fouling of the original groundwater extraction and treatment system
was a continual problem. After repeated attempts were made to address this problem, the system was
shut down in March 2003 and was not ever put back into operation. Numerous additional investigations
were conducted at the Site to determine feasible alternatives to address the groundwater contamination
in the silty sand aquifer. These efforts ultimately resulted in the amended remedy. The hydraulic
containment system was designed, constructed and placed into operation in July 2014. Modifications to
the institutional controls implemented in 2015 include an environmental covenant on the portions of the
Site owned by the city and a new city ordinance preventing installation of open-loop geothermal systems
within the city. Efforts are underway, but not completed, to replace the deed restrictions on the portion
of the Site owned by the state of Iowa with an environmental covenant.
The determination that has been made during this five-year review is that the remedy at the Peoples
Natural Gas site is protective in the short term because soil excavation and institutional controls prevent
direct exposure to residual contamination and groundwater containment, and institutional controls
prevent unacceptable use of the contaminated aquifer. In order to be protective in the long term, the
benzene plume needs to be fully delineated, the institutional control vehicle and enforceability needs to
be improved, and the conceptual site model needs to incorporate groundwater/surface water interactions
in Dove Harbor.
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Five-Year Review Summary Form
SITE IDENTIFICATION
Site Name:
Peoples Natural Gas
EPA ID:
1AD980852578
| Region: 7
State: LA
City/County: Dubuque/Dubuque
SITE STATUS
NPL Status: Final
Multiple OUs? No Has the site achieved construction completion? Yes
REVIEW STATUS
Lead agency: EPA
[If "Other Federal Agency", enter Agency name]: Click here to enter text.
Author name (Federal or State Project Manager): Diana Engeman, EPA RPM
Author affiliation: EPA-Region 7
Review period: 7/1/2014 - 10/1/2015
Date of site inspection: 7/8/2014
Type of review: Statutory
Review number: 4
Triggering action date: 7/22/2010
Due date (fiveyears after triggering action date): 7/22/2015
Vll
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Five-Year Review Summary Form (continued)
Issiies/Rccommendiitions
1 .
|0lj(s)without^sue
^/Regommendatiorislc
eniifi^lin;th?Five-:Yi
I"1"-" j
| None
Issuesand Recommendations Identifiea in the Five-Year Review
IjP
— • •
OU(s): 00
Issue Category: Institutional Controls
Issue: Deed restriction on Iowa Department of Transportation property has limited
enforceability.
Recommendation: Replace deed restriction on the Iowa Department of Transportation
property with an environmental covenant pursuant to the Iowa Uniform Environmental
Covenants Act.
Affect Current
Protectiveness
Affect Future
Protectiveness
Party Responsible
Oversight Party
Milestone Date
No
Yes
Other
EPA
12/31/2016
OU(s): 00
Issue Category: Institutional Controls
Issue: Current ICs may not prevent installation of wells that could adversely affect the
remedy.
Recommendation: Investigate alternatives for improving the current ICs or additional
ICs to prevent adverse impact on the remedy by installation of wells.
Affect Current
Protectiveness
Affect Future
Protectiveness
Party Responsible
Oversight Party
Milestone Date
No
Yes
PRP
EPA
6/30/2017
OU(s): 00
Issue Category: Monitoring
Issue: Extent of benzene contamination at W-21 not fully determined.
Recommendation: Additional groundwater sampling in the vicinity of W-21 to determine
extent of benzene contamination.
Affect Current
Protectiveness
Affect Future
Protectiveness
Party Responsible
Oversight Party
Milestone Date
No
Yes
PRP
EPA
6/30/2017
OU(s): 00
Issue Category: Remedy Performance
Issue: Determination of impact of contamination from the site on ecological receptors in
Dove Harbor is based on limited information.
Recommendation: Update conceptual site model to better understand and quantify site
groundwater contribution to surface water and sediment of Dove Harbor.
Affect Current
Protectiveness
Affect Future
Protectiveness
Party Responsible
Oversight Party
Milestone Date
No
Yes
PRP
EPA
6/30/2017
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Sitcwidc Protectiveness Statement
Protectiveness Determination:
Addendum Due Date (if applicable):
Short-term Protective
Click here to enicr a dale.
Protectiveness Statement: The remedy at the Peoples Natural Gas site is protective in the short-term because
soil excavation and institutional controls prevent direct exposure to residual contamination, and groundwater
containment and institutional controls prevent unacceptable use of the contaminated aquifer. In order to be
protective in the long term, the benzene plume needs to be fully delineated, the institutional control vehicle and
enforceability needs to be improved, and the conceptual site model needs to incorporate groundwater/surface
water interactions in Dove Harbor.
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FOURTH FIVE-YEAR REVIEW REPORT FOR
PEOPLE'S NATURAL GAS
DUBUQUE, IOWA
1.0 INTRODUCTION
The purpose of five-year reviews is to determine whether the remedy at a site remains protective of
human health and the environment. The methods, findings and conclusions of the review are
documented in Five-Year Review reports. In addition, Five-Year Review reports identify issues found
during the review, if any, and provide recommendations to address them.
The U.S. Environmental Protection Agency (EPA), Region 7 is preparing this Five-Year Review Report
pursuant to the Comprehensive Environmental Response, Compensation and Liability Act (CERCLA)
§121 and the National Contingency Plan (NCP). CERCLA §121 states:
If the President selects a remedial action that results in any hazardous substances, pollutants, or
contaminants remaining at.the site, the President shall review such remedial action no less often
than each five years after the initiation of such remedial action to assure that human health and
the environment are being protected by the remedial action being implemented. In addition, if
upon such review it is the judgment of the President that action is appropriate at such site in
accordance with section [104] or [106], the President shall take or require such action. The
President shall report to the Congress a list of facilities for which such review is required, the
results of all such reviews, and any actions taken as a result of such reviews.
The Agency interpreted this requirement further in the NCP; 40 Code of Federal Regulations
§300.430(f)(4)(ii) states:
If a remedial action is selected that results in hazardous substances, pollutants, or contaminants
remaining at the site above levels that alldw for unlimited use and unrestricted exposure, the
lead agency shall review such action no less often than every five years after the initiation of the
selected remedial action.
This review was conducted between July 2014 and October 2015. A five-year review is required
because, upon completion, the remedial actions resulted in hazardous substances, pollutants or
contaminants remaining on site above levels that allow for unlimited use and unrestricted exposure.
This is the fourth five-year review for the Peoples Natural Gas site (Site). The triggering action for this
review is the signature date of the Third Five-Year Review Report: July 22, 2010. The entire Site has
been addressed as a single operable unit (OU), which is the subject of this five-year review.
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2.0 SITE CHRONOLOGY
A summary of the relevant regulatory and investigative activities associated with the Site is provided
in Table 1.
Table 1 ' , *' S '¦
¦ Chronology of Site Events '• j
Event
Date
Initial discovery of contamination
10/1/1983
Removal action started
4/19/1989
Final listing on National Priorities List (NPL)
8/30/1990
Remedial Investigation/Feasibility Study (RI/FS) completed
5/1991
Proposed Plan available for public comment
6/17/1991
Record of Decision (ROD) signed
9/16/1991
Consent Decree for Remedial Design/Remedial Action (RD/RA) finalized
12/28/1992
Remedial design completed
3/29/1994
Remedial action construction started
8/11/1994
Removal action completed
1/26/1995
First five-year review completed
3/1/2000
Explanation of Significant Differences (ESD) signed
3/1/2000
Preliminary Close Out Report signed
9/29/2000
Ozone sparge system shut down
10/12/2002
Groundwater extraction and treatment system shut down
3/17/2003
Second ESD signed
12/28/2004
Second five-year review completed
9/2/2005
Third five-year review completed
7/22/2010
Proposed Plan available for public comment
, 6/26/2013
ROD Amendment signed
9/25/2013
RD completed and RA started
11/8/2013
Start-up of hydraulic containment system
7/2014
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3.0 BACKGROUND
3.1 PHYSICAL CHARACTERISTICS
The Peoples Natural Gas site is located in the city of Dubuque, Iowa, in the southwest quarter of Section
19, Township 89N, Range 3E, of Dubuque County. (See Figure 1, attached.) The Site occupies
approximately five acres. The area was originally Mississippi River channel modified by the U. S. Army
Corps of Engineers and protected by a 500-year floodwall. The Site is approximately 300 feet west of
the Mississippi River. The eastern portion of the Site is owned by the city of Dubuque. The city operated
a public works garage on the property until 2006. The city currently uses the property for equipment
storage. The western portion of the Site is owned by the Iowa Department of Transportation (IDOT). A
section of U.S. Highway 61 was constructed on this part of the Site following completion of a removal
action to address contaminated soil.
3.2 LAND AND RESOURCE USE
The eastern portion of the Site is occupied by a large garage owned by the city of Dubuque. This garage,
with parking and storage areas, was constructed on the site in 1965. It has been used since that time for
the repair and storage of city-owned vehicles including garbage trucks, road repair equipment, cars, and
trucks. During late 2005 and early 2006 the city moved to a new public works garage at another location
and has since used this property for storage of equipment. For a period of time after the city moved to
the new public works garage, a lumber company leased part of the property for the storage of building
materials. That is no longer the case. Planning is underway for this property to become a local transit
authority bus storage and light maintenance facility.
For many years there were gas and diesel fuel pumps and underground storage tanks on the site for
fueling the city's fleet. Once these pumps were no longer used, the associated underground storage tanks
were emptied and filled with an inert material. In December 2010, the Iowa Department of Natural
Resources (IDNR) determined that no further action was required for the facility, which was identified
as LUST No. 9LT069.
The western portion of the Site has a section of U.S. Highway 61 constructed on it. This construction
work was done after a removal action was completed to remove contaminated soil from the construction
area.
The area surrounding the Site is used for industrial purposes. The Site is surrounded by an Alliant
Energy Company coal-fired power plant to the south which is currently not in operation, rail lines to the
west, a trucking company to the north, and Dove Harbor and the Mississippi River to the east.
The Site is located on the floodplain of the Mississippi River. The Site was built on imported clay fill
material of a thickness of six to twenty feet placed onto over-bank river sediments. Much of the clay fill
has been replaced by clean granular fill during the soil remediation activities that have occurred at the
Site. Two groundwater units were identified and investigated at the Site. The shallowest, a thin, silty
sand unit, lies between two clay-confining units referred to as the upper confining unit (UCU) and the
lower confining unit (LCU). The UCU directly underlies the clay fill and clean granular fill at the
surface of the Site. The alluvial aquifer of the Mississippi River underlies the LCU. The silty sand unit is
present only in a limited area that is in the vicinity of the Site. The silty sand unit is actually part of the
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alluvial aquifer. The silty sand unit is referred to as the "silty sand aquifer" in site documents and
throughout this report for consistency, even though it is not a separate aquifer. Figure 2 depicts a
simplified cross-section of the Site.
While the LCU appears to exist in all of the impacted and source areas of the Site, it is absent in areas
north of the Site, in areas near W-13 and W-113 south of the Site, and in some portions of the Highway
61 corridor. In the areas where the LCU is absent, the alluvial aquifer occurs directly beneath the UCU.
Figure 3 shows the surface of the LCU.
The silty sand aquifer ranges in thickness from 2.5 feet to over 13 feet. The silty sand aquifer is
comprised of silty sand, poorly graded sand with silt, and poorly graded sand. This aquifer is generally
thicker and exhibits a deeper base in the eastern and northern portions of the Site.
The alluvial aquifer underlies the LCU except as described previously, where it is in direct contact with
the UCU. This aquifer consists of poorly graded sand and is used as a source of drinking water in the
Dubuque area. The alluvial aquifer is approximately 150 feet thick in the vicinity of the Site, with coarse
gravels predominating the lower 50 feet. The alluvial aquifer occurs between 19 and 29 feet below
ground surface (bgs) in the northern portion of the Site, an average of 33 feet bgs in the central portion
of the Site, and approximately 41 feet bgs in the easternmost portion of the Site.
The groundwater flow direction in the silty sand aquifer and alluvial aquifer has varied significantly
over the course of site work primarily due to pumping of groundwater and variations in surface water
levels in the Mississippi River. Groundwater flow directions in both aquifers have ranged from north-
northeast to south-southeast when the on-site extraction well and sump pump were not operating.
Historical water well surveys for the Site identified several wells in the area pumping large volumes of
water from the alluvial aquifer. There are currently no wells near the Site that are known to be
influencing groundwater flow at the Site.
Dove Harbor is the closest portion of the Mississippi River to the Site. Dove Harbor is maintained at an
elevation of 581 to 583 feet above sea level. A survey of channel depths by the U.S. Army Corps of.
Engineers from 1998 shows the maximum depth of the Mississippi River in the vicinity of the Site to be
approximately 31 feet below the normal pool elevation, or 561 feet above sea level. Therefore, it appears
that the silty sand aquifer lies below the bottom of Dove Harbor, separated vertically from the bottom
sediments and water of the harbor by approximately 4.5 feet or more of UCU materials, based upon the
elevation of the silty sand aquifer around monitoring well P-112. The top of the LCU slopes upward
near the river. It does appear that groundwater in the fill material at the water table may discharge into
Dove Harbor during periods of low and normal river levels. Groundwater modeling performed during
the remedial investigation indicated that site-contaminated groundwater discharged to the river would
not be at concentrations that would adversely impact surface water quality or freshwater aquatic life.
3.3 HISTORY OF CONTAMINATION
The Site was the location of a former manufactured gas plant that operated from approximately the
1930s to 1954. Above-ground structures were dismantled in 1957. During operation of the plant, coal tar
and cyanide-bearing wood chips were produced and stored on site. Coal tar was stored in one
underground tank and one above-ground tank on the Site. The wood chips were buried on the eastern
portion of the Site. Contaminants of potential concern identified at the site included polynuclear
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aromatic hydrocarbons (PAHs), including benzo(a)pyrene and naphthalene; phenols; volatile organic
compounds (VOCs), including benzene, ethylbenzene, toluene and xylenes (BETX); and cyanide.
3.4 INITIAL RESPONSE
The contamination at the Site was first identified during a geotechnical investigation conducted by
IDOT in preparation for construction of a new section of U.S. Highway 61. Subsequent investigations
performed by the EPA and MidAmerican Energy Company (MidAmerican Energy), a responsible party
for the Site, determined the nature and extent of contamination at the highway construction site.
A removal action was initiated in 1989 to address soil contamination in the area where the highway
construction was to take place. Ultimately, 6,850 cubic yards of contaminated soil and wastes were
excavated and co-burned with coal in a utility boiler during the removal action.
3.5 BASIS FOR TAKING ACTION
A baseline risk assessment was conducted as a part of the remedial investigation. This risk assessment is
included in the Remedial Investigation/Feasibility Study Report and is referred to as an endangerment
assessment. It included a human health baseline risk assessment and an ecological risk assessment. One
of the major objectives of these assessments is to assist in identification of the principal routes of human
and environmental exposure to site contaminants in order to focus the feasibility study on remedial
alternatives that would most effectively prevent or preclude adverse impacts.
In the human health baseline risk assessment the following compounds were identified as contaminants
of concern (COCs): benzene, benzo(a)pyrene, benzo(a) anthracene, benzo(b)fluoranthene,
benzo(k)fluoranthene, chrysene, dibenz(a,h)anthracene, indeno(l,2,3-cd)pyrene, fluorene, fluoranthene,
pyrene, acenaphthene, naphthalene and cyanide. It was determined that an unacceptable level of
carcinogenic risk existed for public works garage workers exposed to soil on the Site, as well as
potential future residential exposure to soil at the Site for both adults and children. Further, it was
determined that an unacceptable level of carcinogenic risk existed in the event there was future
residential consumption of groundwater. The ecological risk assessment determined that freshwater
aquatic life in Dove Harbor would not be adversely impacted by contaminated groundwater discharging
to the harbor. No ecological receptors were identified on the Site property.
4.0 REMEDIAL ACTIONS
4.1 REMEDY SELECTION
The Record of Decision (ROD) for the Peoples Natural Gas site was signed on September 16, 1991.
Separate remedial action objectives (RAOs) were developed for soil and groundwater. The RAO for soil
was to minimize direct contact with contaminated soil. The RAOs for groundwater were to:
• minimize the potential exposure to users of the alluvial aquifer to groundwater with
contaminants that exceed the Maximum Contaminant Levels (MCLs) pursuant to the Safe
Drinking Water Act, have a total excess lifetime cancer risk of greater than lxl0~6 or have a
hazard index that exceeds one;
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• provide remedies that allow eventual achievement of other groundwater standards that are
applicable or relevant and appropriate requirements (ARARs) in the alluvial aquifer; and
• minimize the migration of contaminants from other media to the extent necessary to protect the
alluvial aquifer.
\
The selected remedy in the ROD included the following actions:
• excavation and incineration of contaminated soil from the surface to six feet below grade that
exceeded 100 milligrams per kilogram (mg/kg) of carcinogenic PAHs and 500 mg/kg total
PAHs;
• excavation and incineration of contaminated source soils that have visible coal tar contamination
from six feet below grade to the surface of the UCU;
• enhanced in situ bioremediation to treat the contaminated groundwater and contaminated source
soils in the silty sand aquifer;
• groundwater extraction of both the silty sand and alluvial aquifers to reduce contaminant
concentrations to levels established by the state of Iowa Administrative Code 567 Chapter 133;
and
• groundwater monitoring of both the silty sand and alluvial aquifers to assure successful
implementation of the groundwater remedies.
It was determined during the remedial design that the contaminant concentrations in the alluvial aquifer
did not warrant installation of a groundwater extraction system in that aquifer. Further, because there is
communication between the more heavily contaminated silty sand aquifer and the alluvial aquifer,
pumping of the alluvial aquifer could have resulted in the movement of contaminants from the shallower
silty sand to the deeper alluvial aquifer. This change in the remedy was documented in an Explanation of
Significant Differences (ESD) dated March 1, 2000.
In March 2004, MidAmerican Energy submitted a request to the IDNR for support to modify the
remediation levels for benzene from the negligible risk level of 1 microgram per liter (fxg/L) to the
federal MCL of 5 ^ig/L, and the health advisory level for naphthalene at the time of the ROD of 20 [ig/L
to the revised health advisory level of 100 ^ig/L. In April 2004, the IDNR sent a letter to the EPA
expressing their support for the requested changes. It was further added that "utilization of these goals
would be protective of human health and environment (sic) and would be consistent with our application
of 567-IAC 133". It was determined at that time that the requested modifications were protective and
consistent with federal ARARs, and the modifications were incorporated into a second ESD dated
December 28, 2004.
4.2 REMEDY IMPLEMENTATION
In a Consent Decree entered into with the United States on December 28, 1992, Midwest Gas (currently
MidAmerican Energy Company), IDOT, the city of Dubuque, Iowa, and Enron Corporation agreed to
perform the remedial design and remedial action as well as pay past costs and response costs associated
with the cleanup of the Site. MidAmerican Energy has conducted the work at the Site and paid the
response costs to the EPA. The remedial design was approved by the EPA on June 12, 1992.
As described previously, contaminated soil from the western portion of the Site was excavated under a
removal action prior to initiation of the remedial action. A portion of the contaminated soil and wastes
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from the eastern portion of the Site was also excavated and co-burned with coal in a utility boiler during
the removal action. An additional 10,400 cubic yards of contaminated soil and wastes were excavated
and co-burned with coal in a utility boiler during the remedial action. The areas excavated were
backfilled with clean fill, thus eliminating direct contact with contaminated soil. All soil remediation
was completed in 1998. Soil was not excavated from beneath the former public works garage or a
sanitary sewer main that crosses the Site; therefore, soil contamination likely remains in the subsurface
beneath these structures. Institutional controls have been placed on the property to prevent exposure to
soil contamination and are discussed later in this report.
As documented in the 2000 ESD, the groundwater system was constructed to address contaminated
groundwater in the shallow silty sand aquifer. The groundwater extraction system consisted of one
extraction well and one interception trench, more commonly referred to as the drain sump. Water was
piped from the well and the drain sump to an on-site water treatment facility, which included an air
stripper. The treated water was disposed into the city of Dubuque sanitary sewer system. Installation of
the groundwater extraction and treatment systems was completed in January 1996.
From 1994 through 1999, several investigations and pilot studies were conducted to evaluate the
appropriate method of in situ bioremediation to treat the contaminated groundwater and contaminated
source soil in the silty sand aquifer. Ultimately, it was determined that ozone sparging could be effective
at reducing contaminant concentrations in this zone. The system included a soil vapor extraction system
to remove vapors liberated from the silty sand aquifer into the vadose zone. These vapors were treated
prior to discharge to the atmosphere. Construction of the ozone sparging system was completed in
September 2000. The Site achieved construction completion status when the Preliminary Close Out
Report was signed on September 29, 2000.
4.3 SYSTEM OPERATIONS/OPERATION AND MAINTENANCE
In Situ Bioremediation
The ozone sparging system was operated until October 12, 2002. At that time it was determined that the
potential reductions in contaminant levels in the silty sand aquifer that would result from continued
operation of the system were negligible compared with the cost of operation.
Groundwater Extraction and Treatment System
The plans for long-term monitoring and operation and maintenance (O&M) for the extraction and
treatment system were documented in sections 7 and 8 of the Final Remedial Design, dated March 1994.
In accordance with the plan, groundwater monitoring was conducted as follows: bimonthly for the first
year of operation (1996-1997); quarterly for the next five years (1997-2002); and biannually since that
time.
Throughout the period of operation of the groundwater extraction and treatment system, high levels of
dissolved solids and iron that naturally exist in the aquifer created biofouling problems in the system.
Specifically, the rate of groundwater extraction became significantly diminished when the well screens
and surrounding geologic formation around the well became fouled. As the efficiency of the extraction
system decreased, the ability of the system to capture the contaminated groundwater in the silty sand
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aquifer decreased. The dissolved solids and iron in the extracted groundwater caused fouling of the air
stripping equipment, which reduced that system's performance as well.
The extraction well and drain sump were cleaned repeatedly using both chemical and mechanical
methods. Modifications to the groundwater treatment system were also made to optimize performance.
Eventually, it was determined that biofouling and scaling in the well, lines and treatment system
rendered them inoperable. The groundwater extraction and treatment system was shut down on
March 17, 2003, and was never placed back into operation after that date.
Additional Remedial Investigation Activities
Dense nonaqueous phase liquid (DNAPL), which was not seen in significant quantities during the
remedial investigation of the Site, nor up to the time of the first five-year review in 2000, also was
present in the drain sump. During late 2004, an investigation was conducted using the Tar-Specific
Green Optical Screening Tool (TarGOST™)/cone penetrometer testing to assess the location and volume
of DNAPL present in the subsurface. The total mass of BETX and PAHs at the Site was estimated to be
5,910 and 608,380 pounds, respectively. The majority of this contaminant mass is present as DNAPL.
Further discussion of the DNAPL issue follows in the Data Review section of this report.
Based on the DNAPL investigation results, during 2005 investigations were conducted to better define
the extent of groundwater contamination in the downgradient direction and to determine the extent of
the LCU. Three new monitoring wells were installed in the silty sand aquifer, two wells were installed in
the alluvial aquifer, and three existing wells were replaced because they had been damaged. During the
same time period, two monitoring wells north of the Site were abandoned because they were no longer
needed, and the property owner had development plans which the wells interfered with.
Also, during 2005 MidAmerican.Energy drafted a Technical Impracticability Evaluation Report seeking
approval for a technical impracticability (TI) ARAR waiver as an element of a new proposed
groundwater remedy. During 2006 that report was revised based on comments from the EPA.
During 2007, three soil borings were placed on the western edge of the Site and a monitoring well was
installed west of Highway 61 in the silty sand aquifer to better define the extent of groundwater
contamination and the potential for DNAPL in that portion of the Site. One finding of that investigation
was that the LCU was present in the area investigated. Commencing with the groundwater monitoring
events in 2007, sampling and analysis for natural attenuation parameters were added to the semiannual
groundwater sampling events. This was done so that a determination could be made regarding the
contribution that intrinsic bioremediation plays in the reduction of contaminant mass at this Site.
Additional investigations were conducted from 2010 to 2011 to determine groundwater remedial options
that would be feasible for consideration, as well as preliminary design information for implementation
of a hydraulic containment system. The Technical Impracticability Evaluation Report was amended in
May 2012 and a Technical Memorandum for the Detailed Analysis of the Hydraulic Containment
Remedial Strategy was submitted to the EPA in July 2012. All of this information, as well as an
evaluation of the potential human health risks due to the vapor intrusion pathway and a Screening LeveL
Assessment of Risk from Groundwater, were used in the preparation of the ROD Amendment.
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2013 ROD Amendment
The ROD Amendment was signed by the EPA on September 25, 2013. The 2013 ROD Amendment
modified the groundwater remedial approach from a restoration of the alluvial aquifer to a containment
strategy for on-site groundwater and restoration of the plume downgradient of the Site.
In addition to the RAOs established in the original ROD, two RAOs were added with the ROD
Amendment:
• prevent and/or reduce future human exposure to indoor air containing COCs that exceed health-
based levels, and
• prevent migration of contaminated groundwater from the Site to the Mississippi River.
The selected amended remedy in the ROD Amendment included the following elements:
• institutional controls in conjunction with a hydraulic containment system consisting of extraction
wells located between Kerper Boulevard and the levee to prevent migration of the downgradient
plume;
• groundwater monitoring to verify that natural attenuation is continuing to reduce contaminant
concentrations in the dissolved plume supporting plume stability; and
• a TI ARAR waiver for groundwater in the area designated as the TI zone. (See Figure 1 for the
location of the TI zone.)
The TI zone includes only the silty sand aquifer. It is anticipated that natural attenuation processes will
restore groundwater in the silty sand aquifer outside the TI zone and ensure the alluvial aquifer remains
protected.
In addition to modifying the groundwater remedial approach, cleanup levels were modified in the ROD
Amendment (for groundwater outside the TI zone) so that the RAOs could be achieved. The
groundwater cleanup levels are shown in Table 2. The revised cleanup levels for groundwater were
determined based upon the following hierarchy:
• The MCL is the cleanup level for COCs that have MCLs.
• For COCs without an MCL, a risk-based cleanup level was determined based on an excess lifetime
cancer risk of 1x10"^ and/or a target hazard quotient (HQ) of 1.
• When the risk-based level is below the laboratory practical quantitation limit (PQL), the PQL is the
cleanup level, provided it falls within the acceptable risk range.
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Table 2
Groundwater Cleanup Levels in 2013 ROD Amendment
Contaminant of
Concern
Cleanup
Level in
1991
ROD or
ESDs
Chemical-
Specific
ARAR
(MCLs)
Risk-Based
Level1
Practical
Quantitation
Limit2
1 r IfFSvised ¦ .
„ Cleanup-Level:: :
|! f .ASS" ,
l |Changed
lvalue's are-bbld) ¦'
Benzene
5
5
-
-
5 w .
Ethylbenzene
700
700
-
-
,/ j *
Toluene
2,000
1,000
-
-
' y ^1,000^". ?'
Xylenes
10,000
10,000
-
-
^ x 10,000/
Naphthalene
100
-
0.14
0.1
; * V4v0:14%
Benzo(a)pyrene
0.2
0.2
-
¦ -
f ¦; -- 0.2#' " *
Benzo(a)anthracene
0.1
-
0.029
0.1
0,1
Benzo(b)fluoranthene
0.2
-
0.029
0.1
" *: o.r:|f"* "H
Benzo(k)fluoranthene
0.2
-
0.29
0.1
0.29
Chrysene
0.2
-
2.9
0.1
k \ 2 Q ,
Dibenz(a,h)anthracene
0.2
-
0.0029
0.013
r 0.01^3 - .
Indeno(l,2,3-cd)pyrene
0.4
-
0.029
0.1
0.1
'Risk-based cleanup level was determined based on an excess lifetime cancer risk of lxlO"6 and/or a target HQ of 1.
2Practical Quantitation Limits listed are laboratory Reporting Limits except for dibenzo(a,h)anthracene, where the
Method Detect Limit is used because it is a lower value.
2013 Amended Remedy Implementation
The amended remedy was implemented by MidAmerican Energy pursuant to the 1992 CD, as the 1991
ROD and the CD had included provisions for the implementation of a TI ARAR waiver and some
modification to the groundwater remedy in the event that the original groundwater extraction and
treatment system was unable to address the groundwater contamination adequately. The RD for the
amended remedy was approved by the EPA on November 8, 2013. The hydraulic containment system
was installed in early 2014 and began operation in July 2014.
The hydraulic containment system consists of three groundwater extraction wells, pumps, a control
system, conveyance piping, a system for in-well chemical treatment, and an oil/water separator. The
control system, the system for in-well chemical treatment, and the oil/water separator are housed in a
remediation building as shown in Figure 4. The three extraction wells, identified as SE-3, SE-4 and SE-
5, are individually piped to a single discharge line. The extraction wells are located between Kerper
Boulevard and the Mississippi River levee as shown on Figure 4. The discharge line empties into the
oil/water separator, since the potential exists to entrain DNAPL during groundwater extraction, and the
oil/water separator discharges into an existing sanitary sewer line. The in-weil chemical treatment
system pumps a proprietary sequestering agent into each extraction well to control the well fouling that
was experienced during operation of the original groundwater extraction system at the site.
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Current Operation and Maintenance Activities
The hydraulic containment system that was installed in 2014 is still operating under the Hydraulic
Containment System Startup Plan, dated June 25, 2014. Semi-annual groundwater monitoring is
conducted according to the September 2014 Groundwater Monitoring Plan and the September 2014
Quality Assurance Project Plan. The primary activities associated with the O&M of the remedy include
operating and maintaining the groundwater extraction system, monitoring groundwater in the silty sand
and alluvial aquifers, and maintaining the monitoring wells. Once it has been determined that the
hydraulic containment system operating parameters are unlikely to change, an O&M Plan will be
developed. It is anticipated that this will occur prior to December 2016.
5.0 PROGRESS SINCE THE LAST REVIEW
The protectiveness statements in the Third Five-Year Review Report were as follows:
"The remedy at the Peoples Natural Gas site is protective of human health and the environment in the
short term; however, in order to be certain that the remedy will be protective in the long term, the
follow-up actions listed need to be taken."
The recommended actions and steps taken to address them are as follows:
Recommendation 1: Completion of a treatability study and, if necessary, modifications to the Focused
Feasibility Study to evaluate remedial alternatives to address groundwater contamination to be followed
by a ROD Amendment.
Investigations and a treatability study were conducted from 2010 to 2011 to determine feasible
groundwater remedial options. The Technical Impracticability Evaluation Report was amended in May
2012 and a Technical Memorandum for the Detailed Analysis of the Hydraulic Remedial Containment
Remedial Strategy was prepared in July 2012. All of this information, as well as an evaluation of the
potential human health risks due to the vapor intrusion pathway and a Screening Level Assessment of
Risk from Groundwater, were used in the preparation of the ROD Amendment that was signed by the
EPA on September 25, 2013.
Recommendation 2: Implementation of environmental covenants with both property owners, the city, of
Dubuque and IDOT. to replace deed restrictions on both properties.
An environmental covenant in accordance with the Iowa Uniform Environmental Covenants Act was
filed with the Dubuque County Recorder on September 28, 2015, for the portion of the Site owned by
the city of Dubuque (file number 2015-00012514). This covenant supplanted the deed restriction for the
city property that was required by the removal Administrative Order on Consent. The EPA has begun
working on an environmental covenant with IDOT on the portion of the Site that they own. This has not
been completed but should be completed before September 2016. In the meantime, the deed restriction
on the IDOT property, as required by the removal Administrative Order on Consent, remains in place.
The requirement for an institutional control on the IDOT property is identified as an issue in this five-
year review.
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Recommendation 3: Modification of the remediation level for naphthalene in the ROD Amendment to
reflect changes in the reference dose and the cancer slope factor.
The ROD Amendment changed the remediation level for naphthalene in groundwater from 100 ^ig/L,
which was established in the ESD dated December 28, 2004, to 0.14 [ig/L, which is the level equivalent
to a lxlO"6 excess cancer risk.
Recommendation 4: Review of construction details and inspection.of all monitoring wells with a
probability of failure due to construction methods or materials.
In June 2011, the EPA approved the Work Plan for Additional Delineation and Preliminary Remedial
Design which included plans for abandoning or inspecting the 20 monitoring wells constructed with
black steel riser pipe, as they have an increased probability of failure. Two wells of similar construction
had previously been abandoned when it was determined that they had corroded, allowing contamination
to move to a greater depth. The inspections were conducted in June 2011. Monitoring wells W-13B, W-
13C, W-15B, W-15C, W-22C and W-22-D were abandoned in June 2011consistent with the
requirements of the state of Iowa without inspection, as they were no longer in use. Following
inspection, W-20 and W-119 were abandoned in October 2011 based on evidence of significant
corrosion in the inspection videos. Monitoring wells W-22, W-23, W-24 and AE-1 were identified
during the inspection as being in poor condition but were retained for remedy design purposes until
April 2014, when they were abandoned. Well D-4 was abandoned in April 2014 as well because it was
in the way of a construction project to re-align Kerper Boulevard. Although not constructed in the same
manner, MP-10D was abandoned in March 2015 due to the poor condition of the well, as were W-27
and W-127, which were damaged during construction work in the area. The remaining wells constructed
of black steel riser pipe are being closely monitored. These wells are D-7, SE-2, W-120, W-121, D-5, D-
6 and D-8. The locations of all wells that were abandoned throughout the duration of the project are
shown on Figure 1.
Recommendation 5: Development and implementation of plan to evaluate potential for sediment
contamination to occur in Dove Harbor.
Dredging records for Dove Harbor were reviewed to determine when dredging had occurred and
whether any sampling of the dredged material had taken place. Alliant Energy Company had a permit to
dredge in the harbor in 2010. There are no records to indicate that the dredging occurred.
One of the RAOs that was added with the ROD Amendment was to "prevent migration of contaminated
groundwater from the site to the Mississippi River." This was aimed at preventing future sediment
contamination in the river originating from groundwater at the Site. The hydraulic containment element
of the remedy was selected to prevent migration of the downgradient plume. Early indications from
operation of the hydraulic containment system are that groundwater migration toward the river is being
controlled. In order to confirm this containment, this five-year review includes a recommendation to
update the conceptual site model to incorporate the groundwater/surface water interaction and ensure
containment on site.
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6.0 FIVE-YEAR REVIEW PROCESS
6.1 ADMINISTRATIVE COMPONENTS
The initiation of the five-year review occurred on July 8, 2014, with a visit to the Site. The five-year
review was conducted by Diana Engeman, the EPA Remedial Project Manager for the Peoples Natural
Gas site, with assistance from other members of the EPA Region VII technical staff. Dan Cook of the
Iowa Department of Natural Resources assisted in the review as a representative of a support agency.
6.2 COMMUNITY INVOLVEMENT
On November 22, 2014, a notice was placed in the Dubuque Telegraph Herald that a five-year review
was to be conducted and provided information on how to contact the EPA to provide input. No
comments have been received.
Soon after approval of this Fourth Five-Year Review Report, a notice will be placed in the same
newspaper announcing that the Report is complete, and that it is available to the public at the EPA
Region 7 office and the following link on the internet:
http://semspub.epa.gov/src/collection/07/SC32755.
6.3 DOCUMENT REVIEW
This five-year review consisted of a review of relevant documents including the Annual Reports for
2010 through 2014. A list of documents reviewed is included in Attachment 1.
6.4 DATA REVIEW
Groundwater Monitoring
Since the last five-year review, groundwater monitoring has been conducted semiannually. Groundwater
monitoring was conducted according to the Performance Monitoring Evaluation Plan in the Remedial
Design Report until September 2014. Following construction and start-up of the hydraulic containment
system, Groundwater Monitoring and Quality Assurance Project Plans were approved in September
2014 and reflect the current plans for groundwater monitoring at the Site. Figure 1 shows monitoring
well locations at the Site.
The amended remedy is designed to contain the silty sand aquifer groundwater plume through a
hydraulic containment system at the leading edge of the plume and natural attenuation processes so that
concentrations of groundwater COCs outside the TI zone do not exceed the groundwater cleanup levels.
The current groundwater monitoring plan is designed to evaluate the effectiveness of the amended
remedy. Attaining the groundwater cleanup levels outside the TI zone will be determined by performing
a statistical hypothesis test for each COC at the following monitoring wells designated as compliance
wells:
• W-l 13 - Silty sand aquifer south of the TI zone
• W-128 - Silty sand aquifer west of the TI zone
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• SS-8 - Silty sand aquifer northern edge of TI zone*
• W-13 - Alluvial aquifer south of the TI zone
• W-15 - Alluvial aquifer north of the TI zone
• W-21R - Alluvial aquifer below the TI zone
• W-27 - Alluvial aquifer west of the TI zone (replaced by W-27R in 2015)
• W-29 - Alluvial aquifer below the TI zone
• W-30 - Alluvial aquifer below the TI zone
* During the five-year review it was discovered that the Groundwater Monitoring Plan is
inconsistent with whether SS-8 is a compliance monitoring well or not. The EPA believes it
should be a compliance well and inconsistencies in the Plan will be corrected to clarify this
... matter.
In 2014, monitoring wells W-27 and W-127 were damaged by construction crews working in the area. It
was determined that only W-27 needed to be replaced and the replacement well is W-27R. Five new
monitoring wells were installed. Three of these were alluvial aquifer wells: W-27R (replacement for W-
27), W-29 and W-30. Two new wells were installed in the silty sand aquifer: W-129 and W-130. Three
silty sand extraction wells were installed as part of the hydraulic containment system: SE-3, SE-4 and
SE-5.
Groundwater Flow Direction. During each round of groundwater sampling, water level measurements
were taken in a number of the monitoring wells, including some wells that were not sampled. This
included three wells at the water table, eleven wells and the drain sump in the silty sand aquifer and four
alluvial aquifer wells. Water level measurements are used to determine the direction of groundwater
flow in each aquifer and at the water table. As has been mentioned earlier in this report, groundwater
flow direction in the silty sand aquifer and alluvial aquifer has varied significantly over the course of
investigations and remediation at the Site, primarily due to pumping of groundwater both on and off of
the Site and variations in surface water levels in the Mississippi River.
The groundwater flow direction at the water table is generally to the east or southeast. During periods of
low or normal water levels in the Mississippi River it is likely that water at the water table discharges to
the river. The groundwater flow direction1 at the water table in October 2014 is shown in Figure 5.
During the past five.years the groundwater flow direction in the silty sand aquifer has generally been
toward the south southeast. The purpose of implementing the hydraulic containment system,in 2014 was
to control the groundwater flow in the silty sand aquifer in the vicinity of monitoring well P-112, while
minimizing induced gradients that may promote DNAPL migration. Groundwater level measurements
made since start-up of the system indicate that this leading edge of the contaminated groundwater plume
is being effectively controlled, preventing further downgradient movement of contaminated
groundwater. Figure 6 shows the typical groundwater flow in the silty sand aquifer from March 2014,
prior to start-up of the hydraulic containment system. Figure 7 shows the groundwater flow direction in
the silty sand aquifer in October 2014, after the hydraulic containment system had been in operation for
about three months.
The groundwater flow direction in the alluvial aquifer has been variable during the last five years. Flow
in the alluvial aquifer was toward the east in May and September 2010 and west to southwest in April
2011, April 2012, April and September 2013 and March 2014. In October 2014, the groundwater flow
14
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direction in the alluvial aquifer had numerous components, generally to the west as shown in Figure 8.
Since several monitoring wells in the alluvial aquifer have been abandoned and installed during the past
five years, the water level measurement locations have not been consistent.
Hydraulic Containment System. The hydraulic containment system consists of three groundwater
extraction wells, SE-3, SE-4 and SE-5, pumps, a control system, conveyance piping, a system for in-
well chemical treatment and an oil/water separator. The system was put into operation in July 2014.
From March 2015 through August 2015, tests were conducted to further assess the ability of the system
to manage dissolved-phase groundwater impacts at the eastern perimeter of the TI zone. This work
included pumping tests, slug tests to assess hydraulic conductivity in the silty sand aquifer and
refinement of the numerical groundwater model. Some of the conclusions reached as a result of this
work were:
• The silty sand aquifer essentially acts as a confined aquifer relative to the overlying water table
aquifer and the underlying alluvial aquifer, as demonstrated by the lack of hydraulic
communication during operation of the hydraulic containment system.
• Significant hydraulic communication (i.e., drawdown) is observable between extraction wells
and most nearby monitoring wells in response to system operation.
• Transmissivity of the silty sand aquifer in the vicinity of the hydraulic containment system has
variability beyond that which was originally proposed in the conceptual site model and used for
input data in numerical modeling during system development.
• Extraction from SE-3 and SE-4 is sufficiently extensive to be observed in adjoining extraction
wells and nearby monitoring wells.
• The cone of depression created by groundwater extraction from SE-5 was negligible at several
nearby monitoring wells. Further evaluation is needed to determine whether this is due to
localized areas of low transmissivity or poor extraction well efficiency. Since well fouling has
historically been an issue at the Site, this must be evaluated.
• There is an area near the southern extent of the hydraulic containment system where conductivity
is reduced nearly two orders of magnitude.
• Significant changes to the system (i.e., change of extraction rates) are not warranted at this time;
therefore, extraction of groundwater via the hydraulic containment system will continue at a rate
of 1 to 1.25 gallon per minute for each extraction well.
The hydraulic containment system appears to be performing as expected, capturing the dissolved
groundwater plume in the silty sand aquifer. The system will continue to be closely monitored to
optimize performance as necessary and to ensure continued control of the dissolved plume in the silty
sand aquifer. Further refinement of methods for evaluating performance of the hydraulic containment
system will be considered to achieve these objectives.
Groundwater Sampling. Attachment 2 is a table summarizing the groundwater analytical results, by
monitoring well, from May 1994 through October 2014. The table also lists the cleanup levels that were
established in the ROD Amendment for each of the contaminants.
Water Table. None of the water table monitoring wells has been designated as a compliance well. The
water table wells sampled are W-4, which has been sampled semiannually since October 2005, and D-7,
which has been sampled semiannually since April 2009. W-4 is the more downgradient water table well.
Benzene was detected in W-4 once, in September 2013 at 0.743 [ig/L, well below the MCL of 5 ng/L.
15
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Naphthalene was detected during five of eleven sampling events, with the highest concentration 0.544
Hg/L in September 2012. The cleanup level for naphthalene is 0.14 ng/L. If this low level of naphthalene
were to discharge to the Mississippi River it would not result in a measurable level of naphthalene in
surface water. Low concentrations of other PAH compounds that do not have cleanup levels due to their
relatively low toxicity have also been detected in this well. D-7 is much more heavily contaminated,
with elevated levels of BTEX and all of the PAH compounds.
Siltv Sand Aquifer. The compliance wells for the silty sand aquifer are SS-8, W-113 and W-128. In
addition to the compliance wells, the following silty sand aquifer wells have also been sampled: D-5, D-
6, D-8, P-112, SE-2, SE-3, SE-4, SE-5, SS-6, SS-9, W-117R,.W-118R, W-129 and W-130. Well D-4
was sampled until it was abandoned.
W-113 is the silty sand compliance well on the southern edge of the TI zone. There were detections of
benzene at 1.2 [.ig/L in September 2010 and 4.11 (.ig/L in April 2011, both of which are below the MCL
of 5 f-tg/L. Of the PAHs, naphthalene is the only contaminant to exceed a cleanup level. Naphthalene
was detected at 0.265 ng/L in September 201 land 0.630 ng/L in September 2012, slightly above the
cleanup level of 0.14 [xg/L. The sample from 2011 also had naphthalene found in the method blank. W-
128 is the silty sand compliance well to the west and just outside of the TI zone. This well would
indicate whether residual groundwater contamination was coming from the area where the removal
action was completed prior to the construction of Highway 61. There have not been any detections of the
BETX compounds in W-128 in the past five years. Any PAHs detected in the past five years in that well
have been at very low levels. Naphthalene was detected tat 1.09 ng/L in September 2011and 0.795 [.ig/L
in September 2012, exceeding the cleanup level of 0.14 (.ig/L. As was the case with W-113, there was
naphthalene found in the method blank in 2011. SS-8 is the silty sand compliance well on the northern
edge of the TI zone. The MCL for benzene was exceeded twice in the past five years at 7.93 fig/L in
September 2011 and 5.02 jig/L in October 2014. Naphthalene slightly exceeded the cleanup level in this
well twice but one of those occasions was in September 2011 when there was an issue with the method
blank for that compound. During the past five years, all other PAH compounds were either not detected
or at very low concentrations, well below the cleanup levels.
Silty sand monitoring wells north of 11th Street have not been sampled during the past five years as the
COCs had been detected far less frequently due to the groundwater flow direction having, returned
toward the Mississippi River rather than being pulled from the Site toward the northwest, which
occurred when there were high volume wells owned by industrial users in that area that were pumping in
the 1990s. Water levels are measured in some of the silty sand wells north of lllh Street to determine
groundwater flow direction. The northernmost silty sand monitoring wells sampled are SS-8 and SE-2.
SE-2 was the groundwater extraction well for the original groundwater extraction system but is now
used only as a monitoring well. SE-2 still has elevated levels of benzene but the concentrations have
decreased considerably since the well is no longer used as an extraction well. The same is true for the
levels of PAHs in this well. All PAHs except naphthalene have dropped below the cleanup levels. The
concentration of naphthalene still exceeds the cleanup level but is lower, with the exception of a spike to
111 jug/L in October 2014.
The silty sand wells to the east of the former public works garage, within the TI zone, consistently
exhibit the highest concentration of benzene, ethylbenzene and the PAH compounds. This is not likely
to change due to the presence of DNAPL in the silty sand aquifer. This was thoroughly documented in
the Technical Impracticability Evaluation Report and the amendment to that report, and supported the
16
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decision to implement a technical impracticability ARAR waiver in the ROD Amendment.
The two most recently constructed monitoring wells in the silty sand aquifer are W-129 and W-130. W-
129 is directly north of the northern-most extraction well, SE-4. W-130 is directly south of the southern-
most extraction well, SE-5. They were only sampled one time, during October 2014, prior to completion
of the most recent annual report reviewed for this five-year review. W-129 contained benzene at 13.4
^g/L, exceeding the MCL of 5 [xg/L, and naphthalene at 0.889 [xg/L, exceeding the cleanup level of 0.14
[ig/L. The benzene concentration was below the MCL at W-130 but naphthalene was present at a
concentration of 1.56 |xg/L. The concentrations of all other PAHs at both wells were either below the
detection limit or at very low concentrations. It is anticipated that these wells may continue to exhibit
elevated levels of contamination due to their proximity to the extraction wells.
The dissolved plume in the silty sand aquifer is close to being confined to the TI zone. The cleanup level
for naphthalene was exceeded by a small amount at compliance well W-128 most recently in September
2012. Benzene exceeded the MCL twice in SS-8 in the past five years at 7.93 |xg/L in September 2011
and 5.02 [xg/L in October 2014. Naphthalene slightly exceeded the cleanup level in this well twice. W-
113 is the other compliance well in the silty sand aquifer. None the COCs that were detected exceeded a
cleanup level in that well.
Alluvial Aquifer. The compliance wells for the alluvial aquifer are W-13, W-15, W-21R, W-27 (now W-
27R), W-29, and W-30. In addition to the compliance wells, W-24 is still sampled and W-20 was
sampled through April 2011. In 2011, W-20 was abandoned due to damage to the well that may have led
to contamination moving through that well from the silty sand aquifer into the alluvial aquifer. W-21R
was the only alluvial acjuifer well sampled that had levels of benzene detected above the detection limit.
Benzene was detected in W-21R above the MCL of 5 |xg/L during every sampling event in the past five
years except in September 2010, April 2011 and April 2013. During the past five years, the benzene
-concentration in W-21R has ranged from a high of 206 [xg/L in March 2010 to below the detection limit.
It is believed that the groundwater contamination in the vicinity of that well is due to severe corrosion
found in the original well in this location, W-21, which was abandoned in 2005 after increasing levels of
benzene were found in the well. Since the concentrations of benzene in W-21R have varied over time
but usually exceed the MCL, consideration should be given to sampling groundwater in the alluvial
aquifer to the west of W-21R to determine the extent of this contamination. The naphthalene
concentrations in W-21R exceeded the cleanup level in September 2012 and October 2013, but all other
PAHs were below any cleanup level, if detected.
W-20 was the only other alluvial aquifer monitoring well to have had elevated levels of benzene in the
past and was of a similar construct to W-21. W-20 was abandoned in 2011. There were low levels of
naphthalene detected in the well in May and October 2010 and April 2011, but benzene was not detected
in that well during those sampling events. '
Other alluvial aquifer monitoring wells had low levels of naphthalene, exceeding the cleanup level of
0.14 |xg/L, during sampling events of the past five years, as listed:
• W-13 - 0.404 ^xg/L in September 2012
• W-15 - 0.416 [xg/L in September 2012 and 0.265 [Xg/L in April 2013
• W-24 - 0.215B* [Xg/Lin April 2011 and 0.479 |x.g/L in September 2012
• W-27 - 0.189B* (xg/L in April 2011, 1.66 jxg/L in September 2012 and 0.26 (ig/L in March 2014
17
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* "B" denotes method blank contamination.
The two most recently constructed monitoring wells in the alluvial aquifer are W-29 and W-30. W-29 is
directly north of the northern-most extraction well, SE-4. W-30. is directly south of the southern-most
extraction well, SE-5. They were only sampled one time, during October 2014, prior to completion of
the most recent annual report reviewed for this five-year review. None of the contaminants were
detected in either well.
Dense Nonaqueous Phase Liquid
Historically, DNAPL has been detected in the drain sump, MP-10D, SS-6, SS-7, D-5 and D-6 in the
silty sand aquifer. Figure 9 shows the extent of DNAPL in wells and cone penetrometer borings. The
distribution of DNAPL suggests an eastward migration of the DNAPL plume, following the downward
slope of the interface of the silty sand unit and the LCU. The silty sand aquifer, the LCU, and the
alluvial aquifer dip toward the Mississippi River, although the LCU slopes upward east of Kerper
Boulevard. Concern that the DNAPL plume was migrating led to the decision to perform additional site
investigation activities in late 2004 and early 2005 to delineate the vertical and lateral extent of DNAPL.
The details of the investigation are described in the 2004 Annual Report and the Technical
Impracticability Evaluation Report dated May 2006. Based upon this investigation, the total mass of
BETX and PAHs at the site was estimated to be 5,910 and 608,380 pounds, respectively, and it was
estimated that over 426,830 pounds of PAHs exist as nonaqueous phase liquids. In some of the sampling
locations, DNAPL was found in the fill material above the UCU and in the UCU but not in the silty sand
unit. It was also found that DNAPL occurred throughout the silty sand unit but was not found at the
surface of the LCU in significant amounts. It was' determined that even if the DNAPL was accumulating
at the surface of the LCU, it is unlikely it would flow toward the Mississippi River past Kerper
Boulevard due to the upward slope of the LCU in that area. This was also predicted to limit the
movement of DNAPL into Dove Harbor. Additional investigation and analysis of the DNAPL has not
been performed in the past five years but its presence was a significant factor during the development of
the selected remedy in the 2013 ROD Amendment and led to the need for a TI ARAR waiver. Further
investigation of the DNAPL is not planned at this time. However, should DNAPL begin to move toward
or into the hydraulic containment system, additional investigation would be needed.
TI Zone
The location of the TI zone is shown on Figure 1. As described in the ROD Amendment, "the TI zone
for this site applies to the shallowest occurrence of groundwater to the bottom of the LCU. This includes
all of the silty sand aquifer in the area as shown" in Figure' 1. The attainment of groundwater cleanup
levels will be determined by performing a statistical hypothesis test as described in Section 3.1.6 of the
2014 Quality Assurance Project Plan. Compliance for each COC with the respective groundwater
cleanup level will be determined at each of the compliance wells. Based on the data set characteristics
(e.g., data distribution, variability, number of data points, number of data points below the method
detection limit, number of tied data values, etc.), an appropriate statistical test will be selected to
calculate the 95 percent upper confidence limit (UCL) of the true mean concentration for each COC at
each compliance point. The 95 percent UCL of the true mean concentration of the COC at each
compliance point will be compared to the respective groundwater cleanup level. The statistical testing
will be conducted annually for each compliance point monitoring well. A COC is determined to be
compliant at a compliance point if the 95 percent UCL of the true mean concentration is equal to or less
18
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than the respective cleanup level.
Beginning with the sampling event in October 2014, the analytical method used for PAHs was changed
from EPA Method 8310 (high-pressure liquid chromatography) to Method 8270D SIM (gas
chromatography/mass spectrometry with selected ion monitoring.) It was decided that only groundwater
monitoring data generated after this change in analytical method for PAHs would be used for the
statistical determination of whether the concentrations were in compliance outside the TI zone.
Therefore, it will be some time until enough data have been collected and this statistical evaluation can
be conducted. It is clear that benzene concentrations at alluvial well W-21R exceed the MCL and there
have been concentrations of naphthalene slightly exceeding the cleanup level at several alluvial
compliance wells, although none were found during the October 2014 sampling event. Benzene did not
exceed the MCL in two of the silty sand compliance wells, W-113 and W-128, but naphthalene slightly
exceeded the cleanup level in September 2011 and September 2012 in both wells. In silty sand
compliance well SS-8, the MCL for benzene was exceeded twice in the past five years at 7.93 (xg/L in
September 2011 and 5.02 fxg/L in October 2014. Naphthalene slightly exceeded the cleanup level in this
well twice.
Summary of Data Review
• An amended remedy was selected in 2013 and implemented in 2014 that is designed to contain
the silty sand aquifer groundwater plume through a hydraulic containment system at the leading
edge of the plume in conjunction with natural attenuation processes so that concentrations of
groundwater COCs outside the TI zone do not exceed the groundwater cleanup levels.
• Numerous monitoring wells were abandoned due to poor condition, damage or road (
construction: W-20, W-119, W-22, W-23, W-24, AE-1, MP-10D, W-13B, W-13C, W-15B, W-
15C, W-22C, W-22D, W-27, W-127 and D-4.
• Three new alluvial aquifer wells were installed, W-27R (replacement for W-27), W-29 and
W-30. Two new silty sand aquifer wells were installed, W-129 and W-130. Three silty sand
extraction wells were installed as part of the hydraulic containment system, SE-3, SE-4 and SE-
5.
• The groundwater flow direction at the water table is generally to the east or southeast.
• During the past five years the groundwater flow direction in the silty sand aquifer has generally
been toward the south southeast.
• The groundwater flow direction in the alluvial aquifer has been variable during the last five years
and is influenced by water levels in the Mississippi River.
• Groundwater level measurements made since start-up of the hydraulic containment system
indicate that the leading edge of the contaminated groundwater plume in the silty sand aquifer is
being effectively controlled, preventing further downgradient movement of contaminated
groundwater.
• W-4 is the most downgradient water table well sampled and naphthalene was detected during
five of eleven sampling events, with the highest concentration 0.544 ^ig/L in September 2012.
• W-113 is the silty sand compliance, well on the southern edge of the TI zone. Benzene was
detected below the MCL of 5 [xg/L in September 2010 and. April 2011, and naphthalene
exceeded the cleanup level of 0.14 [ig/L at 0.265 [Ag/L in September 201 land 0.630 ng/L in
September 2012. The sample from 2011 also had naphthalene found in the method blank.
19
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• W-128 is the silty sand compliance well to the west and just outside of the TI zOne. None of the
BETX compounds were detected during the past five years. Naphthalene was detected at 1.09
[.ig/L in September 2011 and 0.795 ^g/L in September 2012. As was the case with W-113, there
was naphthalene found in the method blank in 2011.
• SS-8 is the silty sand compliance well on the northern edge of the TI zone. The MCL for
benzene was exceeded twice in the past five years at 7.93 (ig/L in September 2011 and 5.02 |.ig/L
in October 2014. Naphthalene slightly exceeded the cleanup level in this well twice but was
detected in the method blank on both occasions.
• Benzene was detected in alluvial aquifer compliance well W-21R above the MCL of 5 [ig/L
during every sampling event in the past five years except in September 2010, April 2011 and
April 2013. The benzene concentration in W-21R has ranged from a high of 206 ng/L in March
2010 to below the detection limit. Consideration should be given to sampling the alluvial aquifer
west of W-21R to determine the extent of this contamination.
• The concentrations of naphthalene above the cleanup level were detected sporadically in several
of the alluvial wells. These concentrations should be compared to other variables (i.e., river
levels, historical pumping conditions, past well construction issues, etc.) to determine if
correlations exist that could provide useful information.
• Insufficient data are available to conduct a statistical analysis of compliance with cleanup levels
outside the TI zone at this time.
6.5 SITE INSPECTION
An inspection of the Site was conducted on July 10, 2014, by Diana Engeman, EPA Remedial Project
Manager. Jenny Coughlin, Senior Environmental Analyst for MidAmerican Energy, and Kevin
Armstrong, Project Manager for MWH, MidAmerican Energy's environmental consultant, ,were also
present during the site inspection. The purpose of the inspection was to assess the conditions at the Site,
including operation of the hydraulic containment system, the location and integrity of monitoring wells
at the Site, and land use in the vicinity of the Site. The hydraulic containment system was installed and
had begun operation. All monitoring wells located during the inspection appeared to be in good
Condition. There were no conditions observed at the Site that would indicate that the institutional
controls in place were not effective. There were no observed subsurface disturbances or new water wells
installed in or around the Site. The land use in the vicinity of the Site was unchanged. During the course
of this five-year review information has been gathered from Don Vogt, the city Public Works Director;
Jenny Coughlin, MidAmerican Energy; and Kevin Armstrong and Randy Kroneman, MWH. The Site
Inspection Form is included in Attachment 3-
7.0 TECHNICAL ASSESSMENT
7.1 QUESTION A: IS THE REMEDY FUNCTIONING AS INTENDED BY THE DECISION
DOCUMENTS?
The excavation and treatment of contaminated soil was completed in 1998. All surface and subsurface
soils were addressed based on the requirements of the ROD with the exception of contaminated soils
beneath the former public works garage or a sanitary sewer main that crosses the Site. Soil
contamination likely remains in the subsurface beneath these structures but current institutional controls
on the property prevent direct exposure to this contamination.
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The implementation of the in situ bioremediation remedy (ozone sparging) in the silty sand aquifer
operated for two years and then was decommissioned after it was determined that the system had
minimal effects on contaminated soil and groundwater.
The other major component of the remedy, as described in the 1991 ROD, was the extraction and
treatment of groundwater from the silty sand aquifer. This system operated with limited success, mostly
due to system fouling; until it was shut down in 2003. Based on limitations with the in situ
bioremediation remedy, and challenges operating the extraction and treatment system, it was determined
that restoration of the silty sand aquifer was not practicable. As a result, the groundwater remedy was
modified by the 2013 ROD Amendment, which included a hydraulic containment system in the silty
sand aquifer consisting of extraction wells located between Kerper Boulevard and the levee to prevent
migration of the downgradient plume, institutional controls and implementation of a TI ARAR waiver
for a location designated as the TI zone.
The hydraulic containment system began operation in July 2014. The limited data gathered to date
indicate that the system is operating as designed. Sufficient groundwater monitoring data has not yet
been collected to perform the statistical analysis of compliance with groundwater cleanup levels outside .
the TI zone, but elevated levels of benzene exist around alluvial aquifer well W-21R.
Pursuant to the 1989 Administrative Order on Consent for the Removal Action at the Site, institutional
controls, in the form of deed restrictions, were implemented. Notices were placed on the deeds for the
portion of the Site owned by the city of Dubuque as well as that portion owned by IDOT. These notices
state that "no disturbance or excavation at a depth of six or more feet may be conducted on the property
unless appropriate employee safety and health training procedures have been implemented, and the work
is conducted in a manner that does not release or threaten the release of the hazardous substances."
Further it states that "under no circumstances may water supply wells or private wells be drilled on the
property without the written approval of the Environmental Protection Agency and the city of Dubuque,
Iowa." An environmental covenant was filed with the Dubuque County Recorder on September. 28,
2015, for the portion of the Site owned by the city of Dubuque, supplanting the notice on the deed and
extending the coverage to a larger area including the TI zone. The EPA has begun working on an
environmental covenant with IDOT on the portion of the Site that they own. This has not been
completed but should be completed before December 2016. In the meantime, the deed restriction
remains in place on the IDOT property.
On June 1, 2015, the city of Dubuque enacted ordinance number 37-15, which prohibits all open-loop
geothermal systems. The ordinance allows for closed-loop systems subject to the requirements for the
construction, reconstruction, repair and destruction of geothermal wells. This ordinance does not,
however, control installation or operation of potential high volume extraction wells that could impact the
hydraulic control of the remedy. This ordinance has relevance to this Site as there have been requests in
the past to install high-volume geothermal system wells in the alluvial aquifer near the Site that had the
potential to move the contaminated groundwater.
The Site continues to be listed on the state of Iowa Registry of Confirmed Abandoned or Uncontrolled
Disposal Sites..On August 28, 2015, MidAmerican Energy sent a Notification of Groundwater
Contamination to the city of Dubuque Water Department, the Dubuque County Health Department and
the Water Supply Section of IDNR, informing them of groundwater contamination in the vicinity of the
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Peoples Natural Gas site. This letter should be sent annually to these entities that are involved in the
process of issuing permits for water wells in the vicinity of the Site or supply drinking water in the area.
To date, there have been no unsafe disturbances of the subsurface or the installation of any water or
private wells on the Site that have been demonstrated to adversely impact the hydraulic containment
component of the remedy. However, dewatering wells have been installed near enough to the Site that
there is a concern that they may have an adverse impact on the contaminated groundwater plume. Steps
need to be taken to determine the best approach to ensure that extraction of groundwater in the vicinity
of the Site does not occur until it can be determined that such actions will not have an adverse effect on
the remedy at the Site.
7.2 QUESTION B: ARE THE EXPOSURE ASSUMPTIONS, TOXICITY DATA, CLEANUP
LEVELS, AND REMEDIAL ACTION OBJECTIVES (RAOS) USED AT THE TIME OF
REMEDY SELECTION STILL VALID?
Changes in Standards and To Be Considered
There are no newly promulgated standards for the contaminants at this Site nor are there any additional
changes to the ARARs identified in the 2013 ROD Amendment.
Changes in Exposure Pathways. Toxicity, and Other Contaminant Characteristics
There have been no changes in the land use assumptions that would affect the protectiveness of the
remedy. On December 20, 2013, the Executive Director of the East Central Intergovernmental
Association sent a letter to the EPA stating that the city of Dubuque, Iowa, intends to redevelop the .
location of the former public works garage to provide storage and maintenance of the city's fleet of
public transit buses, house dispatch and management offices and provide transit employee meeting and
storage facilities. The property would not be a passenger transfer facility. The letter describes that the
redevelopment will remove the existing structural framework of the building currently on the property,
leave the existing slab intact and build a new structure on the existing slab. On behalf of the city, she
requested that the EPA provide a "comfort letter" with respect to the property. Letters were provided to
the EPA from IDNR and IDOT concurring with the proposed reuse. In response to this request, on
January 15, 2014, the EPA sent a letter to the Executive Director of the East Central Intergovernmental
Association stating, "Based on the information currently available regarding the Site and the Property,
the EPA has no objections to the intended redevelopment activities and reuse as described in your
letter." It was pointed out in this response that the ROD Amendment calls for institutional controls that
are improved over the 1991 deed notification, and the city is a party to the Consent Decree and with the
other named parties is bound to implement the remedial actions, including the improved institutional
controls. The improved institutional control, in the form of an environmental covenant on the Site
property owned by the city, was filed with the Dubuque County Recorder of Deeds on September 28,
2015.
The use of the property owned by the IDOT has not changed and is not anticipated to change in the
future. There is still a deed restriction on this property and work has begun on replacing this with an
environmental covenant. The property owner has indicated it does not object to this change in the form
of the institutional control. There have been no changes in the physical conditions of any part of the Site
that would affect the protectiveness of the remedy.
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The approach to evaluating the vapor intrusion pathway has changed since the remedial investigation
and the endangerment assessment were conducted. Prior to preparation of the ROD Amendment, a
screening-level evaluation of future human health risks associated with vapor intrusion exposure was
conducted using groundwater monitoring data from the Site and current risk methodologies. The
concentrations of contaminants in groundwater were used to estimate indoor air concentration expressed
in micrograms per cubic meter ([xg/m3) of air. The results of the screening level evaluation were
summarized in Table 2 of the ROD Amendment. The estimated excess individual lifetime cancer risks
for benzene, ethylbenzene and naphthalene were greater than lxlO"4 and the noncancer HQ was greater
than one for benzene and naphthalene. Specifically, benzene presents the highest excess individual
lifetime cancer risk of 5xl0"4 and naphthalene presents the highest HQ of 5.5. Based on this evaluation,
it was determined that contaminants in groundwater at the Site are at concentrations that may pose a
significant health risk through vapor intrusion. The total excess individual lifetime cancer risk and
noncancer HQs may be higher than presented in the screening level risk assessment because risk was
only determined for individual contaminants. In addition, soil contamination that remains below the
building on the Site could contribute to potential vapor intrusion. Due to the potential of exposure to air
contamination through vapor intrusion into the building over the contaminated groundwater plume, the
environmental covenant on the city property includes the following activity and use limitation:
"Unless prior approval is given by EPA, any new construction of enclosed buildings at the
Property must prevent, or include remedial systems to control and/or abate vapor intrusion of
Contaminants of Concern, as listed on Exhibit B, into any such new construction at the Property,
if necessary for compliance with published standards for protectiveness of human health and the
environment and appropriate for the intended use of the buildings. Such remedial systems must
be properly operated and maintained."
The EPA has been in communication with the consultant designing the bus storage facility regarding
their plans to address potential vapor intrusion in the new building. Of particular interest with regard to
vapor intrusion are the areas of the building that will house the offices for the transit system.
It is anticipated that the environmental covenant on the property owned by IDOT will also include this
activity and use limitation even though it is unlikely any building would be constructed on the property,
which is used for a roadway.
The soil remediation levels for the removal action and the remedial action were the same. As was
common practice at former manufactured gas plant sites at the time these soil remediation actions were
conducted, the remediation levels for PAHs were not identified compound-specifically but rather were
set at 100 mg/kg total carcinogenic PAHs (cPAHs) and 500 mg/kg total PAHs (tPAHs) from the surface
to a depth of six feet and visible contamination below six feet to the top of the UCU. The compounds
included as cPAHs for these actions were benzo(a)anthracene, benzo(a)pyrene, benzo(b)fluoranthene,
benzo(k)fluoranthene, chrysene, dibenz(a,h)anthracene, and indeno(l,2,3-cd)pyrene. The compounds
included as tPAHs for these actions were all of the cPAHs, as well as fluorene, fluoranthene, pyrene,
acenaphthene, and naphthalene. Since that time, naphthalene has been determined to be carcinogenic.
Soil remediation levels for benzene or cyanide were not established for either the removal or remedial
actions even though they were identified as COCs in the endangerment assessment. Although not clearly
explained why remediation levels were not established for these contaminants in soil, they were only
present in the areas addressed by the removal or remediation of soil contaminated by PAHs, and
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therefore were cleaned up such that they were no longer present above health-based levels. Even though
the soil remediation levels were not compound-specific for the PAHs, only low levels of PAHs were
ever detected in limited areas at the surface and these areas were excavated and backfilled with clean fill
during the remediation of the more heavily contaminated subsurface soil. Therefore, no exposure of on-
site workers to surface soil above health-based levels would be expected and the soil portion of the
remedy continues to be protective. In the event that at some time in the future the building on the Site is
removed exposing soil, investigation of the soil beneath the building should take place so that it can be
determined whether further remediation is warranted.
Cyanide was identified as a contaminant of potential concern in groundwater in the endangerment
assessment, but it was not a groundwater COC in the 1991 ROD. While not explained in the ROD,
further evaluation of the noncancer risk associated with this compound in groundwater at the Site
indicated the hazard index was 1.86x103 for an adult resident and 1.91x10° for a child resident. These
levels are so low that cyanide was properly eliminated as a COC. This was clarified in the 2013 ROD
Amendment.
There is no reason to believe that any new contaminants or contaminant sources exist at the Site. There
are no known toxic by-products of the remedy at the Site. Intrinsic bioremediation of these contaminants
does not result in toxic by-products. There are no additional changes to contaminant characteristics
known at this time that could impact the protectiveness of the remedy.
Changes in Risk Assessment Methodologies
There were changes in the standardized risk assessment methodologies since the 1991 ROD that led to
changes in the groundwater cleanup levels in the 2013 ROD Amendment. The EPA's risk-based
regional screening levels (RSLs) for tapwater for several of the COCs have changed since the 2013
ROD Amendment. The current tapwater RSLs for those COCs without MCL levels are included in
Table 3. Each of these RSLs are based on a potential excess cancer risk of lxlO"6, using the EPA's
default exposure assumptions.
Table 3
Comparison of 2013 Groundwater Cleanup Levels to Current Tapwater RSL Values
in fig/L
'•'* Contaminant of ;
Concern.4}
Groundwater Cleanup
Levelin >
2013 ROD Amendment
Current EPA Tapwater
'^RStKiune'2bli)«.J: ?
Change
Benzo(a)anthracene
0.029
0.012
Decrease
Benzo(b)fluoranthene
0.029
0.034
Increase
Benzo(k)fluoranthene
0.29
0.34
Increase
Chrysene
2.9
3.4
Increase
Dibenz(a,h)anthracene
0.0029
0.0034
Increase
Indeno(l,2,3-cd)pyrene
0.029
0.034
Increase
Naphthalene
0.14
0.17
Increase
It has been determined that none of these changes are of such significance as to warrant modifying the
ROD and they do not affect the protectiveness of the remedy. The changes that could affect the soil
cleanup levels include the current standard risk assessment practice to quantify the cancer risks from
24
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dermal contact with PAHs, which were not quantified in the endangerment assessment; the
determination that naphthalene is carcinogenic; and changes to several exposure assessment input
parameters. These changes do not have a significant impact on the conclusions of the risk assessment
and do not affect the protectiveness of the remedy.
In the endangerment assessment, ecological risk was evaluated for freshwater aquatic life in the
Mississippi River and Dove Harbor. Concentrations of benzene, benzo(a)anthracene, benzo(a)pyrene
and naphthalene, in surface water in both the harbor and the river, were estimated based on contaminant
transport modeling of the contaminant levels that could be expected to reach these areas. These
estimated concentrations were compared to ecological screening levels available at the time and it was
concluded that only the concentration of naphthalene might pose an unacceptable level of risk in the
harbor. The chronic and acute contaminant levels in freshwater used for comparison in the
endangerment assessment are not consistent with the levels that would now be used to assess risk in
freshwater.
In the absence of available sediment data, groundwater concentrations from wells near the river were
compared to current screening levels for surface water. This comparison of groundwater concentrations
to EPA Region 5 Ecological Screening Levels (ESLs) is shown in Table 4.
Table 4
Comparison of Groundwater Concentrations to Ecological Screening Levels for Surface Water
in iig/L . '
Contaminant of Concern
Region 5
ESL
Maximum Water Concentration, 2010-2014
W-4
P-112
W-129/
W-130
W-29/
W-30
W-20
Acenaphthene
38
2.42
23.2 .
0.10U
0.407
Acenaphthylene
4840
0.605
75.6
11.4
.0.10U
2.18
Anthracene
0.035
0.0555
f0.506. .
0.37":;;^|f
0.10U
¦IlPif
Benzene
114
0.743
'1590
13.4
0.5U
l.OU
Benz(a)anthracene
0.025
0.0203
0.105U
1.0U
0.10U
0.043
Benzo(a)pyrene
0.014
0.00962
0.008U
1.0U
0.10U
,.0.0459®l
Benzo(b)fluoranthene
9.07
0.10U
0.105U
1.0U
0.10U
0.0588
Benzo(g,h,i)perylene
7.64
0.2U
0.211U
1.0U
0.10U
0.008U
Benzo(k)fluoranthene
NE
NA
NA
NA
NA
.NA
Chrysene
NE
NA-
NA
NA
NA
NA
Dibenz(a,h)anthracene
NE
NA
NA
NA
NA
NA
Dibenzofuran
4
NA
NA
NA
NA
NA
Ethylbenzene
14
1.0U
Willis:'
1.0U
l.OU
l.OU
Fluoranthene
1.9
0.10U
0.105U
l.OU
0.10U
0.0693
Fluorene
1.9
0.764
i<>-2
QO
•rH
o.iou
1.41
2-Methylnapthalene
330
0.185
11.8
0.21
0.10U
NA
Naphthalene
13
0.544
1.56
O.IOU
0.318
Phenanthrene
3.6
0.15
?5.9
0.833
O.IOU
0.0889
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Contaminant of Concern
Region 5
ESL
Maximum Water Concentration, 2010-201'
W-4
P-112
W-12 9/
W-130
W-29/
W-30
W-20
Pyrene
0.3
0.0614
0.105U
1.0U
0.10U
0.017U
Toluene
253
1.0U
24.8
1.0U
1.0U
1.0U
Xylenes
27/
1.0U
Jfl
3.7
3.0U
6.0U
Notes:
NA Nol analyzed
NE Not established
U Result is non-detect at the reporting limit shown
Shaded Result exceeds Region 5 ESL
Bold Result is non-detect but reporting level exceeds Region 5 ESL
Although this does not directly address the issue of PAH accumulation in the sediment, it does provide a
current, albeit simplistic, snapshot of potential effects on aquatic life in the harbor due to groundwater
migration. Groundwater data from 2010 through 2014 was reviewed. Groundwater concentrations in
some of the wells, particularly P-112, exceed screening levels for surface water; however,
concentrations of some contaminants appear to be decreasing. The endangerment assessment concluded
that naphthalene in particular could pose an unacceptable risk in the harbor. The maximum
concentration of naphthalene in P-112 was detected in September 2010 (877 [ig/L); concentrations in .
March 2014 (34.7 |ig/L) and October 2014 (2.53 j.tg/L) were nearer or below the surface water screening
level of 13 (.ig/L.
Since this groundwater analysis does not reliably predict concentrations in surface water, it is
recommended that the contaminant transport model developed in the endangerment assessment, or some
similar analysis, be used to evaluate current conditions at the Site. Ideally, sediment data would also be
collected and used as a second line of evidence for evaluating aquatic risk in the harbor. However, given
the multiple current and historical sources of PAHs not related to the Site that exist in the harbor, this
may not be feasible. If the harbor is dredged in the future, this may provide an opportunity to conduct
sediment sampling for the Site that would be supportive of the information provided by the contaminant
transport model. A letter will be sent to the U.S. Army Corps of Engineers, the permitting authority for
dredging permits in Dove Harbor, making a request that a requirement for sampling of sediments for
PAHs be added to future permits issued for the harbor.
Evaluation of Remedial Action Objectives (RAOs)
The RAOs for the Site are as follows and were established in the 1991 ROD and the 2013 ROD
Amendment:
Soil
• Minimize direct contact with the soil.
Groundwater
• Minimization of the potential exposure to users of the alluvial aquifer to groundwater with
contaminants that exceed the Maximum Contaminant Levels (MCLs) pursuant to the Safe
Drinking Water Act, have a total excess lifetime cancer risk of greater.than 1x10 or have a
hazard index that exceeds one;
• Provide remedies that allow eventual achievement of other groundwater standards that are
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ARARs in the alluvial aquifer;
• Minimization of migration of contaminants from other media to the extent necessary to protect
the alluvial aquifer; and
• Prevent migration of contaminated groundwater from the Site to the Mississippi River.
Air
• Prevent and/or reduce future human exposure to indoor air containing COCs that exceed health-
based levels.
The RAOs are valid.
7.3 QUESTION C: HAS ANY OTHER INFORMATION COME TO LIGHT THAT COULD
CALL INTO QUESTION THE PROTECTIVENESS OF THE REMEDY?
On October 4, 2011, the city of Dubuque informed the EPA and MidAmerican Energy of a sewer line -
break beneath the former public works garage on the Site. Based on information provided by the city,
408.88 tons of contaminated soil were generated from the repair project. The city disposed the soil at the
Dubuque Metropolitan Area Solid Waste Agency landfill on January 2, 2012. The landfill was
determined to be in compliance with the CERCLA Off-Site Rule prior to disposal. It is not believed that
this work affected the protectiveness of the remedy.
In July 2015, the EPA was contacted by a consultant working on a city project called the "Bee Branch
Watershed Flood Mitigation Project." This is a major flood control project that involves pumping large
volumes of water from the alluvial aquifer in an area approximately 2,500 feet northwest of the Site to
dewater the area during construction. The project will ultimately extend thousands of feet further
northwest of the Site and last for at least two more years. The EPA was not notified of this work until
some of the dewatering wells had been installed and put into operation. This meant there was no
opportunity to model the effect the dewatering associated with this project would have on the
contaminated groundwater plume at the Site, or the hydraulic control of the plume, prior to turning the
wells on. The city is monitoring water levels in monitoring wells on the Peoples Natural Gas site and has
not seen a change in these levels at this point. They have installed piezometers at locations between the
Site and the Bee Branch project, although the EPA has not been informed of their locations. The city has
a consultant preparing a groundwater model, including information that was developed for the Peoples
Natural Gas site as well as other input information, to predict the effect of dewatering the Bee Branch
project on the plume associated with the Site. The EPA has not seen any of the information related to
this modeling effort at this time. While preliminary data indicates that there has been no immediate
impact on the plume, it is not possible to predict whether any long-term effect could be expected without
further information. The city has committed to providing this information in the near future. There are
no residences or water wells known to exist between the Site and the location of the current Bee Branch
project dewatering wells. The fact that these wells were installed and placed into operation before it was
determined whether they may have an adverse impact on the remedy at the Site highlights the need for
measures to be taken to determine the best approach to ensure that this situation does not occur in the
future.
No new targets have been identified during the five-year review. No weather-related events have
adversely affected the protectiveness of the remedy.
27
-------
7.4 TECHNICAL ASSESSMENT SUMMARY
There are two major components to the remedy at the Peoples Natural Gas site. The first involved the
excavation and off-site incineration of contaminated soil exceeding the remediation levels. This work
was completed in 1998. Deed restrictions were placed on the affected properties to prevent exposure to
residual contaminated soil.
The second major component of the remedy at the Site involved the remediation of groundwater
contamination and monitoring of groundwater. Originally,, groundwater remediation involved extraction
and treatment of water from the silty sand aquifer and ozone sparging in the source areas of the same
aquifer to restore aquifers to beneficial use. Monitoring of both the silty sand and alluvial aquifers was
required. Deed restrictions were placed on the affected properties to prevent the installation of water
supply and private water wells, and thus prevent exposure to contaminated groundwater. The ozone
sparging system was operated from September 2000 until October 2002, when it was determined that
there was no significant benefit from continuing to operate the system. The groundwater extraction and
treatment system operated from 1996 until March 2003. The remedy was modified in the 2013 ROD
Amendment to include a hydraulic containment system to prevent migration of the downgradient plume,
institutional controls, and implementation of a TI ARAR waiver for a location designated as the TI zone.
The hydraulic containment system has been installed and has been operating for about one year. It
appears that the system is operating as intended. The deed restriction on the city property has been
replaced by an environmental covenant. This environmental covenant includes a restriction aimed at
preventing exposure to potential vapor intrusion of subsurface contaminants into buildings in the future.
The deed restriction remains on the 1DOT property and efforts are underway to replace it with an
environmental covenant. The city has implemented an ordinance limiting the installation of one type of
well in the city. The Site remains on the State Registry, and MidAmerican Energy has begun annual
notification of state aind local officials of the location of groundwater contamination associated with the
Site. The institutional controls did not prevent the installation and operation-of dewatering wells in the
vicinity of the Site prior to a determination that their operation would not adversely affect the remedy at
the site.
The ROD Amendment included revisions to the groundwater cleanup levels that were based on the
current toxicity information for all of the health-based levels. Although there have been some changes in
the risk assessment methodologies since that time, all of the groundwater cleanup levels are protective of
human health and the environment.
Groundwater monitoring data indicate that the areas of groundwater contamination are known and since
no one is using that groundwater, there is no exposure to contaminated water. Additional work is
necessary to determine the extent of benzene contamination in the vicinity of W-21R. The institutional
controls also prevent exposure to groundwater contamination within the TI zone. Semiannual
groundwater monitoring will continue. The effectiveness of the hydraulic containment system will
continue to be monitored and its operation modified if necessary to maintain control of the downgradient
plume in the silty sand aquifer.
In the absence of sediment data, groundwater concentrations from wells near the river were compared to
EPA Region 5 ESLs for surface water. This provides a current, simplistic snapshot of potential effects to
28
-------
aquatic life in the harbor due to groundwater migration. Since this groundwater analysis does not
reliably predict concentrations in surface water, it is recommended that the contaminant transport model
developed in the endangerment assessment, or some similar method, be used to evaluate current
conditions at the Site. A letter will be sent to the U.S. Army Corps of Engineers, the permitting authority
for dredging permits in Dove Harbor, requesting that a requirement for sampling of sediments for PAHs
be added to future permits issued for the harbor.
8.0 ISSUES AND RECOMMENDATIONS
Issues/Recommendations
I- '--iiissfij?. ¦»". m
1 OU(s) withoutlssue
^/Recommendations Ic
*¦: ¦¦ ¦¦ ¦
entm»theFMyc
»r Review:^.; •
fc. 11:
| None |
Issues and^Recommc
'<'5j=«Sv^ •• ••• :••• ' : •
^ndationsIdentifiedintheFivPYear Review
<#¦ -Wl.. . '
OU(s): 00
Issue Category: Institutional Controls
Issue: Deed restriction on Iowa Department of Transportation property has limited
enforceability. . .
Recommendation: Replace deed restriction on the Iowa Department of Transportation
property with an environmental covenant pursuant to the Iowa Uniform Environmental
Covenants Act.
Affect Current
Protectiveness
Affect Future
Protectiveness
Party Responsible
Oversight Party
Milestone Date
No '
Yes
Other
EPA
12/31/2016
OU(s): 00
Issue Category: Institutional Controls '
Issue: Current ICs may not prevent installation of wells that could adversely affect the
remedy.
Recommendation: Investigate alternatives for improving the current ICs or additional
ICs to prevent adverse impact on the remedy by installation of wells.
Affect Current
Protectiveness
Affect Future
Protectiveness
Party Responsible
Oversight Party
Milestone Date
No
Yes
PRP
EPA
6/30/2017
¦ OU(s): 00
Issue Category: Monitoring
Issue: Extent of benzene contamination at W-21 not fully determined.
Recommendation: Additional groundwater sampling in the vicinity of W-21 to determine
extent of benzene contamination.
Affect Current
Protectiveness
Affect Future
Protectiveness
Party Responsible
Oversight Party
Milestone Date
No
Yes
PRP
EPA
6/30/2017
29
-------
OU(s): 00
Issue Category: Remedy Performance
Issue: Determination of impact of contamination from the site on ecological receptors in
Dove Harbor is based on limited information.
Recommendation: Update conceptual site model to better'understand and quantify site
groundwater contribution to surface water and sediment of Dove Harbor.
Affect Current
Protectiveness
Affect Future
Protectiveness
Party Responsible
Oversight Party
Milestone Date
No
Yes
PRP
EPA
6/30/2017
The following recommendations that do not impact protectiveness were also identified:
• The O&M Plan should include plans to inspect all remaining wells constructed with black steel
riser pipe on a regular basis and replace the wells if needed.
• Further evaluation should be done to determine whether there are localized areas of low
transmissivity or poor extraction well efficiency in the vicinity of SE-5; especially since well
fouling has historically been an issue at the Site.
• The EPA will send a letter to the U.S. Army Corps of Engineers, the permitting authority for
dredging permits in Dove Harbor, requesting that a requirement for sampling of sediments for
PAHs be added to future permits issued for the harbor.
• The Groundwater Monitoring Plan must be amended to clarify that SS-8 is a compliance
monitoring well.
9.0 PROTECTIVENESS STATEMENT
Sitcwide Protectiveness Statement
Protectiveness Determination: Short-term Protective Addendum Due Date [if applicable)/Click
here to enter ;i date.
Protectiveness Statement: The remedy at the Peoples Natural Gas site is protective in the short term because soil
excavation and institutional controls prevent direct exposure to residual contamination and groundwater
containment and institutional controls prevent unacceptable use of the contaminated aquifer. In order to be
protective in the long term, the benzene plume needs to be fully delineated, the institutional control vehicle and
enforceability needs to be improved, and the conceptual site model needs to incorporate groundwater/surface
water interactions in Dove Harbor.
10.0 NEXT REVIEW
The next five-year review for the Peoples Natural Gas Superfund site is required five years from the date
of this review.
30
-------
-------
FIGURE 1
Site Map
-------
-------
-------
FIGURE 2
Conceptual Model Cross-Section
-------
\\USW»SC3\l*«WW\CXAMWWwKO«VX*v«ip*-HW<,'\eM-ft-V2a"9 *®» -a w* - ' l*f
BEDROCK
NOT TO SCALE
>RAWNBY
T*/WINEUND
NORA DAY
managing cm DES MOINES. IOWA
MIDAMERICAN ENERGY COMPANY
PEOPLES NATURAL GAS SITE
DUBUQUE, IOWA
0 MWH
>eCKEDBV
IWWIfiAM)
APPROVED Br
KEVIN ARMSTRONG
•ROJECT MANAGER
KEVIN ARMSTRONG
TITLE
CONCEPTUAL MODEL CROSS SECTION
FIGURE
2
-------
FIGURE 3
Topographic Surface of the Lower Confining Unit
-------
n
| 12th ST.
1 V
LEGEND
• WATER TABLE MONITORING WELL
+ SILTY SAND MONITORING WELL
ALLUVIAL AQUIFER MONITORING WELL
Q ABANDONED MONITORING WELL
A CPT LOCATION
® SOIL BORING
(579.8) LOWER CONFINING UNIT SURFACE
ELEVATION (FEET ABOVE SEA LEVEL)
—— TOPOGRAPHIC CONTOUR OF THE SURFACE
OF THE LOWER CONFINING UNIT
(ID) INSUFFICIENTLY DEEP TO ENCOUNTER LCU
(ND) CANNOT BE DETERMINED FROM BORING LOG
JCS1GNFD BY
KEVIN ARMSTRONG
DES MOINES. IOWA
/ffit MWH
JRAWN3Y
NOWADAY
MIDAMERICAN ENERGY COMPANY
PEOPLES NATURAL GAS SITE
DUBUQUE IOWA
:HECKEDBY
KPPROVtD 3Y
KEVIN ARMSTRONG
KEVIN ARMSTRONG
0 120
\3ra
»ROjeCT MANAGER
KEVIN ARMSTRONG
SCALE IN FEET
LOWER CONFINING UNIT
3
-------
FIGURE 4
Hydraulic Containment System Layout
-------
t
r.
f; Ti
-------
FIGURE 5
Groundwater Flow Direction
Water Table Aquifer
October 20, 2014
-------
r
c
r
r
r
LEGEND:
+
+
a
(593.24)
*
GROUNDWATER ELEVATION CONTOUR (FT ASL)
APPROXIMATE DIRECTION OF GROUNDWATER
FLOW
TECHNICAL IMPRACTICABILITY ZONE
WATER TABLE MONITORING WELL
SILTY SAND MONITORING WELL
ALLUVIAL AQUIFER MONITORING WELL
ABANDONED MONITORING WELL
GROUNDWATER ELEVATION (FT ASL)
GROUNDWATER ELEVATION NOT USED IN
CONTOURING
DUBUQUE, IOWA
MIDAMERICAN ENERGY COMPANY
PEOPLES NATURAL GAS SITE
GROUNDWATER FLOW DIRECTION MAP
WATER TABLE AQUIFER
OCTOBER 20, 2014
MWH
-------
FIGURE 6
Groundwater Flow Direction
Silty Sand Aquifer
March 24, 2014
-------
r
c
c
c
GROUNDWATER ELEVATION CONTOUR (FT ASL)
APPROXIMATE DIRECTION OF GROUNDWATER
FLOW
TECHNICAL IMPRACTICABILITY ZONE
BROWNIES
AUTO SALVAGE
WATER TABLE MONITORING WELL
UW-22C
SILTY SAND MONITORING WELL
ALLUVIAL AQUIFER MONITORING WELL
ABANDONED MONITORING WELL
(593.24)
GROUNDWATER ELEVATION (FT ASL)
-+ W-121
(594.78)
GROUNDWATER ELEVATION NOT USED IN
CONTOURING
SS-10
DfcwllNE
W-118R
(594.50)
TANK
(594.60)
4.P-112
fTP-1011
TP-102,,
(594.71)
(594.00)
(594.17)
W-126.
(594.27) w-vT
MISSISSIPPI RIVER
(Dove Harbor)
(595.72)
DUBUQUE. IOWA
0110(15
01 <33/15
MIDAMERICAN ENERGY COMPANY
PEOPLES NATURAL GAS SITE
motis
01
-------
FIGURE 7
Groundwater Flow Direction
Silty Sand Aquifer
October 20, 2014
-------
r.
r
r
n
r.
[
i:
i
W-120
(594.58)
1594.41)^,
f /CiW-118
,^N-2\R
' 'W-118R
(594.42)
W-128
(594.52)
GASHOLDER |
IM LINE
AMMONIA
TANK
(594.63)
r GAS
HOLDER
(594.02).
M020,(593i^
(593.92)^/ /
RELIEF I
HOLDER i
(593.40)
593.6
593.4
CITY OF DUBUQUE
PUBLIC WORKS
GARAGE
MISSISSIPPI RIVER
(Dove Harbor)
(594.1)
01/23*15
LEGEND:
GROUNDWATER ELEVATION CONTOUR (FT ASL)
m APPROXIMATE DIRECTION OF GROUNDWATER
FLOW
—— TECHNICAL IMPRACTICABILITY ZONE
• WATER TABLE MONITORING WELL
+ SILTY SAND MONITORING WELL
ALLUVIAL AQUIFER MONITORING WELL
a ABANDONED MONITORING WELL
(593.24) GROUNDWATER ELEVATION (FT ASL)
GROUNDWATER ELEVATION NOT USED IN
CONTOURING
(NG) NOT GAUGED
DUBUQUE, IOWA
MIDAMERICAN ENERGY COMPANY
PEOPLES NATURAL GAS SITE
GROUNDWATER FLOW DIRECTION MAP
SILTY SAND AQUIFER
OCTOBER 20, 2014
^ MWH
FIGURE
7
BROWNIES
AUTO SALVAGE
-------
FIGURE 8
Groundwater Flow Direction
Alluvial Aquifer
October 20, 2014
-------
-------
FIGURE 9
Extent of DNAPL
-------
-------
ATTACHMENT 1
Documents Reviewed
31
-------
Attachment 1
Documents Reviewed
2010 Annual Report, February 23, 2011. 1
2011 Annual Report, February 6, 2012.
2012 Annual Report, January 25, 2013.
2013 Annual Report, Februaryl2, 2014.
2014 Annual Report, February 27, 2015.
Amendment to the May 2006 Technical Impracticability Waiver, April 13, 2012.
Amendment to the Record of Decision, September 25, 2013.
Consent Decree, Civil Action No. C92-1048, December 28, 1992.
Declaration and Explanation of Significant Differences, March 1, 2000.
Environmental Covenant, filed with Dubuque County Recorder, September 28, 2015.
Explanation of Significant Differences, December 28, 2004.
Groundwater Monitoring Plan, September 1, 2014.
Hydraulic Containment System Start-Up Plan, June 25, 2014.
Letter re: City of Dubuque's Recent UST Closure Project at the Site, December 21, 2011.
Letter re: Notice of Groundwater Contamination Near the Site, August 28, 2015
Letter re: Permission to Abandon W-27 and W-127 and Install W-27R, November 20, 2014.
Letter re: Reuse and Redevelopment of the Former City of Dubuque Operations Maintenance Facility,
January 15, 2014.
Letter Requesting Concurrence Letter for Bus Storage and Maintenance Facility Project, December 20,
2013.
Memorandum re: Screening Level Assessment of Risk from Groundwater, September 20, 2012.
Memorandum re: Evaluation of Potential Human Health Risks via the Groundwater to Indoor Air Vapor
Intrusion Pathway, October 19, 2012.
Preliminary Remedial Design for the Hydraulic Control System, October 11, 2013.
-------
Quality Assurance Project Plan, September 1, 2014.
Record of Decision, September 16, 1991.
Remedial Investigation/Feasibility Study, May 15, 1991.
Third Five-Year Review Report, July 22, 2010.
Technical Impracticability Evaluation Report, May 2006.
Well Abandonment Forms for W-20 and W-119, November 11, 2011.
Well Installation Work Plan, March 18, 2014.
Well Plugging Records for Six Wells, July 12, 2011.
Work Plan for Additional Delineation and Preliminary Remedial Design, May 20, 2011.
-------
ATTACHMENT 2
Groundwater Analytical Results
i
31
-------
CZj CZD a ET3 -CZD CZJ L~J CU C_J
GROUNDWATER ANALYTICAL RESULTS
MIDAMERICAN ENERGY COMPANY
PEOPLES NATURAL GAS SITE
DUBUQUE, IOWA
Sample Location:
D-7
D-7
D-7
D-7
D-7
D-7
' D-7
. Screened Unit:
Water Table
Water Table
Water Table
Water Table
Water Table
Water Table
Water Tabl
Depth BTOC (feet):
22.3
22.3
22.3
22.3
22.3
22.3
22.3
Sample Date:
06-Jun-01
20-Sep-01
29-Apr-09
15-Sep-09
31-Mar-10
06-May-10
20-Sep-11
Cleanup
Analyte
Units
Level
Benzene
pg/i-
5
970
1400
.726
¦638
638
na
582
Toluene
mq/l
1,000
390
600
'318
240
247
na
225
Ethylbenzene
pg/L
700
140
250
142
. 126
109
na
115
Xylenes
Mg/L
10,000
150
370
236
232
231
na
174
2-Methylnaphthalene
wg/L
—
460
550
na
na
na
na
na
Dibenzofuran
|jg/L
~
41
39_
na
na
. na
na
na
Acenaph'thene
pg/L
-
130
92
43.9
136
0.337 U
61.8
48.7
Acenaphthylene
Mg/L
- ¦
93
69.
38.3
133
1.33 U
0.435 U
5.93
Anthracene
pg/L
—
40
47
16.2
'177
318
13.8
27
Benzo(a)anthracene
Mg/L
0.1 ¦
16
18
5.34
71.6
147
31.7
8.51
Be'nzo(a)pyrene
pg/L
0.2
9.7
12
7.44
53.8
125
38.7
7.1
Be nzo( b )f I u o ra n th e n e
mq/l
0.1
6.8 J
14
6.54
39.4
0.429 U
0.140 U
6.75
Benzo(g,h,i)perylene
Mg/L
.-- .
4.2 J
10 U
4.47
29.1
0.122 U
15.8
3.29
Benzo(k)fluoranthene
pg/L
0.29
8.2 J
5.1 J
2.20
24
35.8
0.0350 U
1.95
Chrysene
jjg/L
2.9
14
17
4.15
80.5
435
18.7
9.58
Dibenzo(a,h)anthracene
pg/L
0.013
1.4 J .
10 U
0.936
6.85
0.0510 U
0.0100 U
0.635
Fluoranthene
Mg/L
—
38
42
19.7
337
598
112
39.4
Fluorene
Mg/L-
—
82
81
55.9
306
0:816 U
' 70.5 '*
57.9
lndeno(1,2,3cd)pyrene
pg/L
0.1
4.6 J .
4.8 J
4.08
26.2
0.0306 U
14.2
3.38
Naphthalene
Mg/L
0.14 ¦
1600
1600
105
1460
R
939
0.0523 U
Phenanthrene
pg/L
'
160
200
27.5
710
1350
107
78.3
Pyrene
pg/L
55
54
17
177
268
• 11.8
.34.3
2015-02-02 Dubuque-PNG.Groundwater (10-14)
Water Table Aquifer Wells
2/2/2015
1 of 77
-------
GROUNDWATER ANALYTICAL RESULTS
MIDAMERICAN ENERGY COMPANY
PEOPLES NATURAL GAS SITE
DUBUQUE, IOWA
Sample Location: D-7
D-7
D-7
D-7
D-7
1
D-7
W-4
Screened Unit: Water Table
Water Table
Water Table
Water Table
Water Table
Water Table
Water Table
Depth BTOC (feet): 22.3
22.3
23.3
23.3
23.3
23.3
23.4
Sample Date: 24-Apr-12
25-Sep-12
30-Apr-13
04-Sep-13
25-Mar-14
22-0ct-14
11 -Oct-05
Cleanup
Analyte
Units
Level
Benzene
pg/L
5 576
557
¦•J-
840
806
496
1
424
gr.=:
u:- 10 u
Toluene
pg/L
1,000 258
250
344 *
' 359
194
168
u 1.0 u
Ethylbenzene
pg/L
700 139
167
174
217
95.4.
118
1.0 u
Xylenes
pg/L
10,000 264
311
267
344
208
216
1.0 u
2-Methylnaphthalene
pg/L
. 10.2
40.7
na
na
na
170
na
Dibenzofuran
M9/L
na
na
na
na
na
na
na
Acenaphthene
pg/L
25.6
44.7
57.8
11.6
90.3
127
1.1 Ja
Acenaphthylene
pg/L
9.69
30.4
64.9
' 0.0888 U
36.8
72
2.4
Anthracene
pg/L
6.07
8.13
7.45
1.32
46.3,
162
0.073
Benzo(a)anthracene
pg/L
0.1 2.92
2.36
. 1.42
0.971
20.2
76.8
0.032 Ja
Benzo(a)pyrene
pg/L
0.2 2.94
1.87
1.23
2.64
28.6
50.6
0.028 Ja
fib"
Benzo(b)fluoranthene
pg/L
0.1 2.51
1.53
1.14 y
0.989
13.2
66.5
V 0.049 U
Benzo(g,h,i)perylene
pg/L
1.74
1.85
2.29
3.14
8.21
22.2
f 0.19 U
Benzo(k)fluoranthene
pg/L
0.29 0.91
0.721
0.417 4
2.26
13.5
25.6
V 0.049 U
Chrysene
pg/L
2.9 2.22
2.87
1.92
10.3
19.1
73.3
0.031 Ja
Dibenzo(a,h)anthracene
pg/L
.0.013 0.264
0.498
0.888
1.83
1.92
6.89
0.29 U
Fluoranthene
pg/L
11.5.
11.9
7.64
2.74
78.9
220
0.18
Fluorene
pg/L
- . 21.9 .
36
42.1
56.7 '
87.8
135
0.11 Ja
lndeno(1,2,3cd)pyrene
pg/L
0.1*' 1.45
0.908
0.732
1.43
8.43
21.8
0.13 U
Naphthalene
pg/L
0.14 2.54
7:29 '
" 307
23.6
411
139
¦1.3 U
Phenanthrene
p'g/L
15.2
20.8
26.3
2.89
164
292
f. 0.15
¦Au-
Pyrene
pg/L
8.94
.9.77
7.35
25.6
73.5
.225
'f'°-12Ja ¦
2015-02-02 Dubuque-PNG Groundwater (10-14)
Water Table Aquifer Wells
2/2/2015
2 of 77
cm? cz3 cms cu cu c~3 a:
-------
r—n i—i f—) r—i
GROUNDWATER ANALYTICAL RESULTS
MIDAMERICAN ENERGY COMPANY
PEOPLES NATURAL GAS SITE
DUBUQUE, IOWA
Sample Location:
W-4
W-4
W-4
W-4
W-4
W-4
W-4
Screened Unit:
Water Table
Water Table
Water Table
Water Table
Water Table
Water Table
Water Table
Depth BTOC (feet):
23.4
23.4
23.4
23.4
23.4
23.4
23.4
Sample Date:
15-Mar-06
12-Sep-06
18-Apr-07
20-Sep-07
06-May-08
01-Oct-08
29-Apr-09
Cleanup
Analyte
Units
Level
Benzene
pg/L
5
1.0 U
1.00 u
1.00 u
1.00 u
1.00 u
1,00 u
1.00 u
Toluene
pg/L
1,000
1.0 u
1.00 u
1.00 u
1.00U
1.00 u
1.00 u
1.00 u
Ethylbenzene
pg/L
700
1.0 u
1.00 u
1.00 u
1.00 u
1.00 u
1.00 u
1.00 u
Xylenes
pg/L
10,000
1.0 u
3.00 U
3.00 U
3.00 U
3.00 U
3.00 U
3.00 U
2-Methylnaphthalene
Mg/L
—
na
na
na
• na
na
na
na
Dibenzofuran
pg/L
~
na
na
na
na
na
na
na
Aceriaphthene
pg/L
--
2.6 U
1.06
0.298
0.526
0.263
2.75
0.631
Acenaphthylene
pg/L
—
0.77 Ja
0:0850 U
0.0850 U
0.0850 U
0.0850 U
0.0967 U.
0.0978 U
Anthracene
pg/L
—
0.052 Ua
0.0103 J
0.0100 U
0.0100 U
0.0100 U
0.0378 J
0.0112 U
Benzo(a)anthracene
i-jg/L
0.1
0.13 U
0.00300 U
0.00300 U
0.00300 U
0.00300 U
0.00556 U
0:00562 U
Benzo(a)pyrene
pg/L
0.2
0.13 U
0.0320 U
0.0320 U
0.0320 U
0.0320 U
0.00889 U
0.00899 U
Benzo(b)fluoranthene
pg/L
0.1
0.052 U
0.0130 U
0.0130 U
0.0130 U
. 0.0130 U
0.0311 U
0.0315 U
Benzo(g,h,i)perylene
pg/L
-
0.21 U
0.00900 U
0.00900 U
0.00900 U
0.00900 U
0.00889 U
0.00899 U
Benzo(k)fluoranthene
pg/L
0.29
0.052 U
0.0150 U
0.0150 U
0.0150 U
0.0150 U
0.00778 U
0.00787 U
Chrysene
pg/L
2.9
0.13 U
0.00500 U
0.00500 U
0.0197 J
0.00500 U
0.00889 U
0.00899 U
Dibenzo(a,h)anthracene
pg/L
0.013
0.31 U*
0.0100 U
0.0100 U
0.0100 U
0.0100 U
0.0111 U
0.0112 U
Fluoranthene
pg/L
—
0.13 U
0.0100 U
0.0100 U
0.0100 U
0.0100 U
0.0111 U
. 0.0112 U
Fluorene
|jg/L
—
0.056 Ja
0.0100 u
0.0653 J
0:31
0.18 J
1.43
0.0180 U
lndeno(1,2,3cd)pyrene
pg/L
0.1
0.13 U
0.00700 U
0.00700 U
0.00700 U
0.00700 U
0.00667 U
0.00674 U
Naphthalene
pg/L
°-14
1.3 U
0.0540 U
0.0567 j;b
0.0540 U
0.0540 U
0.0511 U
0.0517 U
Phenanthrene
pg/L
—
0.10 Ua
0.00700 U
0.00700 U
0.00700 U
0.00700 U
0.00556 U
0.00562 U
Pyrene *•
pg/L
- ¦¦
0.26 U
0.0190 U
- 0.0190 U
0.0-190 U
0.0190 U
0.0284 J
0.0191 U
2015-02-02 Dubuque-PNG Groundwater (10-14)
Water Table Aquifer Wells
2/2/2015
3 of 77
-------
W"
GROUNDWATER ANALYTICAL RESULTS
MIGj&MERICAN ENERGY COMPANY
PEOPLES NATURAL GAS SITE
DUBUQUE, IOWA
Sample Location:
W-4
W-4
W-4
W-4
W-4
W-4
W-4
Screened Unit:
Water Table
Water Table
Water Table
Water Table
Water Table
Water Table
Water Table
Depth BTOC (feet):
23.4
23.4
23.4
23.4
23.4
23.4
23.4
Sample Date:
16-Sep-09
31-Mar-10
06-May-10
14-Sep-10
27-Apr-11
20-Sep-11
24-Apr-12
Cleanup
Analyte
M.
Units
Level
• ¦
¦W
Benzene
yg/L
5
1-°? M&
1.00 u
na
1.00 u
1.00'U
1.00 u
1.00 u
Toluene
Mg/L
1,000
1.00 u '
1.00 u
na
1.00 u
1.00 "u
1.00 u
1.00 u
Ethylbenzene
pg/L
700
1.00 u
1.00 u
na
1.00 u
1.00 u
1.00 u
1.00 u
Xylenes
. Mg/L
10,000
3.00 U
'6.00 U
na
3.00 U
3.00 U
3.00 u
3.00 U
2-Methylnaphthalene
pg/L
—
na
na
na
na
na-
na
0.100 u
Dibenzofuran
. P'g/L
—
na
na
na
na
na
na
na
Acenaphthene
Mg/L
—
1.39
0.570
0.332 •
0.558
0.528
0.991 ,
1.02
Acenaphthylene
Mg/L
¦ --'
0.0870 U
0.0870 U
0.0989 U
0.291
0.0870 U
0.346
0.0870 U
Anthracene
MQ/L
—
0.0189 J
. 0.0100 U
0.0114 U
0.0100 U
0.0100 U
0.0126 J
0.0100 U
Benzo(a)anthracene
Pg/L
0.1 .
0.00651 J
0.00500 U
0.00568 U
0.00500 U
0.0200 U
0.0200 U
0.0200 U
Benzo(a)_g^ene
pg/L
0.2
0.00800 U
0.00800 U
0.00909 U
0.00800 U
0.00800 U
0.00800 U
0.00800 U
Benzo(b)fluoranthene
pg/L
. 0.1
0.0280 U
0.0280 U
0.0318 U
0.0280 U
0.0280 U
0.0280 U
0.0280 U
Benzo(g;hfiifperylene
pg/L
0.00800 U
0.00800 U
0.00909 U
0.00800 U
0.00800 U
0.00800 U
0.00800 U
¦Benzo(k)'fluoranthene
pg/L
0.29
0.0070(A)
0.00700 U
0.00795 U
0.00700 U
0.00700 U.
0.00700 U
0.00700 U
Chrysene
.Mg/L
2,9
0.00800 U
0.00800 U
0.00909 U
0.00800. U
0.00800 U
0.00800 U
0.00800 U
Dibenzo(a,h)anthracene
Mg/L
0:013
0.0100 U
0.0100 U
0.0114 U
0.0100 U
0.0100 U
0.0100 U
0.0100 U
Fluoranthene
Mg/L
—
0.0100 U
0.0100 u
0.0114 U '
0.0100 U
0.0100 U
0.0100 U
0.0100 u
Fluorene
Mg/L
'
0.764
0.0160 U
0.0182 U
0.0160 U
0.0265 J
0.242 :
0.0160 U
lndeno(1,2,3cd)pyrene
pg/L
0.1
0.00600 U
0.00600 U
0.00682 U
0.00600 U
0.00600 U .
0.00600 U
0.00600 U
Naphthalene
Mg/L
0.14
0.153
R
0.0737 J
0.161
0.0460 U
0.0795 J,B .
0.227
Phenarif^pie
Mg/L
—
0.0505 J .
0.00500 U
0.00568 U
0.00500 U
0.00500 U
0.00500 U ¦
0.00500 U
Pyrenevl||
pg/L
" ~~
0.0170 U
0.0170 U
0.0193 U
0.0170 U .
0.0170 U
0.0170 U
0.0170 U
2015-02-02 Dubuque-PNG Groundwater (10-14)
Water Table Aquifer Wells
2/2/2015
4 of 77
a
C1T!
L 1
-------
C~3 CZ3 C33 CZj CIj ¦ C^Z3 CZD EZTJ
GROUNDWATER ANALYTICAL RESULTS
MIDAMERICAN ENERGY COMPANY
PEOPLES NATURAL GAS SITE
DUBUQUE, IOWA
Sample Location:
W-4
W-4
W-4
W-4
W-4
Screened Unit:
Water Table
Water Table
Water Table
Water Table
Water Table
Depth BTOC (feet):
23.4
23.4
23.4
23.4
23.4
Sample Date:
25-Sep-12
30-Apr-13
03-Sep-13
25-Mar-14
21-Oct-14
Cleanup
Analyte
Units
Level
•Benzene
Mg/L
'5
1.00 u
0.50 U
0.743
0.500 U
0.500 U
Toluene
M9/L
1,000
1.00 u
1.00 U •
i:oou
. 1.0.0 U
1.00 U.
Ethylbenzene
MQ/I-
700
1.00 u
1.00 U
1.00 u
1.00 u
1.00 u .
Xylenes
M9/L
10,000
3.00 U
3.00 U
3.00 U
3.00 U-
3.00 U
2-Methylnaphthalene
mq/l
—
0.185 J
na
na
na
0.100 U
Dibenzofuran
pg/L
. »¦
na
na
na
na
ha
Acenaphthene
Mg/i-
"7
2.42
0.385
0.0224 U
2.26
0.872
Acenaphthylene
mq/l
"
0.605
0.404 U
0.0888 U
0.412 U
0.21
Anthracene
Mg/L
-T
0.0555 J
0.101 U
0.0102 U
0.103 U
0.100 U
Benzo(a)anthracene
ijg/L
0.1
0.0203 J
. 0.101 U
0.0204 U
0.103 U,
0.100 U
Benzo(a)pyrene
Mg/L
0.2
0.00962 J
0.101 U
, ¦ 0.0286 U
0.103 U
0.100 U
Benzo(b)fluoranthene
pg/L
0.1
0.0280 U
0.101 U
0.00714 U
0.103 U
0.100 U
Benzo(g,h,i)perylene
M9/L
- '
0.00800 U
0.101 U
0.00816 U
0.206 U
0.100 U
Benzo(k)fluoranthene
Mg/L
0.29
0.00700 U
0.101 U
0.00816 U
0.103 U
0.100 U
Chrysene
pg/L
2.9
0.0244 J
0.101 U
0.00816 U
0.1.03 U
0.100 u
Dibenzo(a,h)anthracene
pg/L
0.013
0.0100 U
0.101 U
0.0102 U
0.103 U
0.0170 U
Fluoranthene
Mg/i-
.¦ —
0.0100 U
0.101 u
0.0102 U
0.103 U
0.100 u
Fluorene
pg/L
—
' 0.581
0.101 u
0.0163 U
0.587. ,
o:ioou
lndeno(1,2,3cd)pyrene
Mg/L
0.1
0.00600 U
0.101 u
0,00162 U
0.103 U
0.100U
Naphthalene
Mg/L-
' 0.14
' 0.544
0.101 u
0.0469 U
0.224
0.365
Phenanthrene
Mg/L
—
0.150
0.101 u
0.00510 U"
0.103 U
0.100 u
Pyrene
pg/L
0.0614 J
0.101 u
0.0173 U
, 0.103 U
0.100 u
2015-02-02 Dubuque-PNG Groundwater (10-14)
Water Table Aquifer Wells
2/2/2015
5 of 77
-------
GROUNDWATER ANALYTICAL RESULTS
MIDAMERICAN ENERGY COMPANY
PEOPLES NATURAL GAS SITE
DUBUQUE,IOWA
'
Sample Locatjon: D-4
D-4
D-4
D-4
D-4
D-4
D-4
D-4
Screened Unit: Silty Sand
Silty Sand
Silty Sand
Silty Sand
Silty Sand
Silty Sand
Silty Sand
Silty Sand
Depth BTOC (feet): 37.0
37.0
37.0
37.0
37.0
37.0
37.0
37.0
Sample Date: 29-Apr-09
15-Sep-09
31-Mar-10
06-May-10
15-Sep-10
27-Apr-11
20-Sep-11
24-Apr-12
-Cleanup
Analyte
Units
Level
Benzene
pg/L
5 458.0
413
222
na
.440
1430
778
2040
Toluene
pg/L
1,000 13.5.
10.0 U
5.00 U
na
6.97
26.5
. 19.3
87.4
Ethylbenzene
H9/l
700 484
.321'
99.8
na
349
1010
673
989
Xylenes
pg/L
10,000 176.0
137'
30.0 U
na
. 119
500
203
512
2-Methylnaphthalene
Mg/L
na
na
na
na
na
na
na
7.75
Dibenzofuran
pg/L
na
na
na
na-
na
na
na
na
Acenaphthene
.wg/L
59.9
40.4
39.4
71.9
85.4
94.5
137
45.3
Acenaphthylene
pg/L
56.4
0.870'U
51.1
0.870 U
95
' 0.0870 U
176
159
Anthracene
pg/L
1.57
0.746
1.68
1.51
2.52
2.25
.2.9
0.86
Benzo(a)anthracene
pg/L
0:1 • 0.00500 U
0.00500 U
0.00500 U
0.00500 U
0.00500 U
0.0200 U
0.0200 U
0.0200 U
Benzo(a)pyrene
pg/L
0.2 0.00800 U
0.00800 U
0.00800'U
0.00800 U
0.00800 U
0.00800 U
0.00800 U
0.00800 U
Benzo(b)fluora'nthene
pg/L
0.1 0.0280 U
0.0280 U
0.0280 U
0.0280 U
0.0280 U
, 0.0280 U
0.0280 U
0.0280 U
Benzo(g,h,i)perylene
pg/L
0.00800 U
0.0186 J
0.00800 U
0.00800 U '
" 0.00800 U
'0.00800 U
0.00800 U
0.00800 U
Benzo(k)fluoranthene
pg/L
0.29 0.00700 U
0.00700 U
0.00700 U
0.00700 U
0.00700 U
0.00700 U
0.00700 U
0.00700 U
Chrysene
pg/L
2.9 0.00800 U
0.00800 U
0.00800 U
0.00800 U
0.00800 U
0:00800 U
0.00800 U
0.00800 U
Dibenzo(a,h)anthracene
pg/L
0.013 0.0100 U
0.0100 U
0.0100 U
0.0100 U
0.0100 U
0.0100 U
0.0100 U
0.0100 U
Fluoranthene
pg/L
0.0.1,00 U
0.471
0.0100 u
0.0100 U
0.0100 U
0.0100 u
.0.0100 U
0.0100 U
Fluorene
pg/L
47.8
. 36.1,
21.7
39
39.6
13
56.4
20.2
lndeno(1,2,3cd)pyrene
pg/L
0.1 O.OO^OO U
0.00600 U
0.00600 U
0.00600 U
0.00600 U
0.00600 U
0.00600 U
0.00600 U
Naphthalene
pg/L
0.14 214
107
R
320
30.2
964 B
214 B
810
Phenanthrene
pg/L
15.1
9.91
9.52
12
17.6
17.9
21.5
11.7
Pyrene
pg/L
0.0170 U
0.0170 U
• 0.0170 U
0.0170 U
0.0170 U
0.0170 U
0.0170 U
0.0170 U
2015-02-02 Dubuque-PNG Groundwater (10-14)
Silty Sand Aquifer Wells
2/2/2015
6 of 77
nu
CH3 E
~ ~~ C3 EZ3
[ J . l ]
-------
CZ3 E~3- C~3 ' CZD EZ] C3. CZp
GROUNDWATER ANALYTICAL RESULTS
MIDAMERICAN ENERGY COMPANY
PEOPLES NATURAL GAS SITE
DUBUQUE, IOWA
Sample Location:
D-4
D-4
D-4
D-4
D-5
D-5
D-5
D-5
Screened Unit:
Silty Sand
Silty Sand
Silty Sand
Silty Sand
Silty Sand
Silty Sand
Silty Sand
Silty San
Depth BTOC (feet):
37.0
37.0
37.0
37.0
37.5
37.5
37.5
37.5
Sample Date:
25-Sep-12
30-Apr-13
04-Sep-13
25-Mar-14
31-Mar-10
06-May-10
20-Sep-11
24-Apr-1
Cleanup
Analyte
Units
Level
Benzene
MQ/L
5
1090
975
1300
2180
1290
na
1120
1300
Toluene
M9/L
1,000
23.2
19.3
22.4
35.3
432
na
192
329
Ethylbenzene
mq/l
700
780
838
1010
1270
850
na
571
759
Xylenes
pg/L
10,000
339
298
200
537
770
na
468
743
2-Methylnaphthalene
mq/l
--
7.96
na
na
na
na
na
na
116
Dibenzofuran- '
Mg/L
¦
na .
na.
na
na
na
na
na
Acenaphthene
Mg/L
--
99.6
82.7
2.76
89.2
111
97.1
104
62.3
Acenaphthylene
pg/L
--
99.4
4.08 U
61.1
4.00 U
1.74 U
0.870 U
163
0.435 U
Anthracene
(jg/L
-
2
1.72
0.0102 U
1.61
5.89
6.01
8.35
21.1
Benzo(a)anthracene
pg/L
0.1
0.0200 U
0.102 U
0.0204 U
0.100 U
3.05
2.19
2.25
8.98
Benzo(a)pyrene
Mg/L
0.2
0.00800 U
0.102 U
0.00816 U
0,100 U
3.40
0.00800 U
2.35
8.29
Benzo(b)fluoranthene
Mg/L
0.1
0.0280 U
<0.102
0.0286 U
0.100 U
0.0280 U
0.0280 U
2.11
5.76
Benzo(g,h,i)perylene
pg/L
--
0.00800 U
0.204 U
0.00816 U
0.200 U
0.00800 U
2.84
1.23
4.89
Benzo(k)fluoranthene
Mg/L
0.29
0.00700 U
0.102 U
0.00714 U
0.100 U
0.00700 U
0.00700 U
0.868
2.46
Chrysene
pg/L
2.9
0.00800 U
0.102 U
0.00816 U
0.100 U
0.00800 U
1.06
2.53
6.42
Dibenzo(a,h)anthracene
pg/L
0.013
0.0100 U
0.102 U
0.0102 U
0.100 U
0.0100 U
0.0100 U
0.217
0.698
Fluoranthene
pg/L
— .
1.22
0.989
0.0102 U
1.83
10.6
10.8
8.22
25.4
Fluorene
Mg/L
—
45.5
32.1
58.6 H
54.3
52.3
49.5
50.1
40.9
lndeno(1,2,3cd)pyrene
pg/L
0.1
0.00600 U
0.102 U
0.00612 U
0.100 U
0.00600 U .
0.777
1.16,
3.97
Naphthalene
pg/L
0.14
284
99.2
23.8
555
R
2280
3130 B
627
Phenanthrene
pg/L
—
20.1
15.1
17.8 H
20.2
34.6
25
30.8
¦ 59.9
Pyrene
pg/L
--
0:0170 U
0.102 U
0.0173
. 0.903
0.0170 U
0.0170 U
7.58
16.5
2015-02-02 Dubuque-PNG Groundwater (10-14)
Silty Sand Aquifer Wells
2/2/2015 7 of 77
-------
GROUNDWATER ANALYTICAL RESULTS
MIDAMERICAN ENERGY COMPANY
PEOPLES NATURAL GAS SITE
DUBUQUE, IOWA
Analyte
Sample Location:
Screened Unit:
Depth BTOC (feet):
Sample Date:
Cleanup
Units Level
D-5
Silty Sand
37.5
25-Sep-12
D-5
Silty Sand
37.5
30-Apr-13
D-5
Silty Sand
37.5
04-Sep-13
D-5
Silty Sand
37.5
25-Mar-14
D-5
Silty Sand
37.0
22-Oct-14
D-6
Silty Sand
37.0 ,
21-Mar-01
D-6
Silty Sand
37.0
06-Jun-01
D-6
Silty Sand
37.0
20-Sep-01
Benzene
Mg/L
5
1190
1510
980
1810
1790
52
48
80
Toluene
pg/L
1,000
406
327
338
221
686
17
7.9
12
Ethylbenzene
pg/L
700
722
642
612
493
873
59
38
37
Xylenes
pg/L
10,000
762
662
629
523
886
56
34
32
2-Methylnaphthalene
pg/L
—
617
na
na
na
206
93
47
48
Dibenzofuran
Mg/L
—
na
na
na
na
na
12
6.2 J
5.3 J
Acenaphthene
pg/L
—
259
41.2
28.7
99.5
67.5
68
41
36
Acenaphthylene
pg/L
--
<0.870
4.00 U
1450
4.30 U.
6.7
11
4.8 J
3.5 J
Anthracene
pg/L .
—
105
1.75
4.23
8.36
1.85
5.2 J
5.5 J
4.8 J
Benzo(a)anthracene
pg/L
0.1
46.3
0.493
27.8
1.71
1.41
10 U
10 U
10 U
Benzo(a)pyrene
pg/L
0.2
41
0.484
17
1.86
1.33
10 U
10 U
10 U
Benzo(b)fluoranthene
pg/L
0.1
27.2
' 0.354
10.7
1.34
1.16
10 U
10 U
10 U
Benzo(g,h,i)perylene
Mg/L
--
17.6
0.3
24 .
0.636
0.100 U
10U
10 U
10 U
Benzo(k)fluoranthene
pg/L
0.29
13.8
0.181
14.5
1.18
0.100 U
10U
10 U
10 U
Chrysene
pg/L
2.9
63
0.718
35.3
1.68
1.34
10 U
10 U
10 U
Dibenzo(a,h)anthracene
pg/L
0.013
2.11
0.100 U
2.21
0.108 U
0.170 U
10 U
10 U
10 U
Fluoranthene
pg/L
—
149
2.34
71.6
9.02
2.53
1.8 J
2.3 J
2.6 J
Fluorene
pg/L
—
232
20.8
158
49.7
18
28
16
13
lndeno(1,2,3cd)pyrene
pg/L
• 0.1
16.4
0.277
10.7
0.589
0.100 U
10 U
10 U
10 U
Naphthalene
pg/L
0.14
1480
1380
1870
1500
1690
620
220
160
Phenanthrene
pg/L
—
343
9.64
173
39.1
20.1
28
23
19
Pyrene
pg/L
-
134
2.73
• 66.6
8.29
3.27
2 J
2.2 J
2.6 J
2015-02-02 Dubuque-PNG Groundwater (10-14)
Silty Sand Aquifer Wells
2/2/2015
cm cr3 cz3 cm
CJ E1_J
8 of
-------
CZ3 EZD CZ3 ¦ dm EZ3- a CZ3 EZJ CTD
GROUNDWATER ANALYTICAL RESULTS
MIDAMERICAN ENERGY COMPANY
PEOPLES NATURAL GAS SITE
DUBUQUE, IOWA
Sample Location:
Screened Unit:
Depth BTOC (feet):
Sample Date:
Cleanup
Analyte Units Level
Benzene
M9/L
5
20
13
56
97
610
990
670
638
Toluene
mq/l
1,000
2.3
3.8
13
25
87
120
33
24.4
Ethylbenzene
jjg/L
700
6.4.
15
61
83
620
730
620
635
Xylenes
MQ/I-
10,000
16
28
65
110
640
600
340
253
2-Methylnaphthalene
pg/L
--
16
18 .
14
8.7 J
na
na
na
na
Dibenzofuran
pg/L
--
4.2 4
3.6 J
6.6 J
9.1 J
na
na
na
na
Aceriaphthene
MQ/L
~
32
30
53
53
690
88
110
170
Acenaphthylene
pg/L
--
2.4 J
8.4 J
12
14
4300
1300
1400
46.4
Anthracene
Mg/L
... ¦
3.2 J
6.6 J
13
15
290
20
20
52.2
Benzo(a)anthracene
pg/L
0.1
10 U
2.9 J
7.9 J
12
180
8.3
9.6
21.9
Benzo(a)pyrene
pg/L
0.2
10 U
2.4 J
6.1 J
14
110
5.2
5.8
22
Benzo(b)fluoranthene
pg/L
0.1
10 U
2.4 J
6.5 j
14.
55
2.7
3.1
17.6
Benzo(g,h,i)perylene
pg/L
--
10 U
0.82 J
2.0 J
4.3 J
37
1.8 Ja
2.1
8.07
Benzo(k)fluoranthene
pg/L
0.29
10 U
0.88 J
2.5 J
5.4 J
35
1.1
1.3/
7.07
Chrysene
pg/i-
2.9
10 U
2.1 J
7.4 J
12
120
5.5
6.2
24.8
Dibenzo(a,h)anthracene
pg/L
0.013
10 U
10 U
10 U
10 U
20
0.87 J
0.88 J
1.95
Fluoranthene
Mg/L
—
2.2 J
8.9 J
20
27
810
42
44
• 75.2
Fluorene
pg/L
—
12
14
21
28
350
35
34
149
lndeno(1,2,3cd)pyrene
pg/L
.. 0.1
• 10 U
1.0 u
2.4 J
5.2 J
47
2.2
2.7
9.41
Naphthalene
Mg/L
0.14
22
24
12.
4.6
4800
1200
800
583
Phenanthrene
Mg/L
—
15
14
11
32
1200
74
77
170
Pyrene
Mg/L
--
2.4 J
11
28
32
450
' 21 "
24
317
D-6 D-6 D-6 D-6 D-6 D-6 D-6 D-6
Silty Sand Silty Sand Silty Sand Silty Sand Silty Sand Silty Sand Silty Sand Silty Sand
37.0 37.0 37.0 37.0 37.0 37.0 37.0 37.0
11-Dec-01 13-Mar-02 07-Jun-02 18-Sep-02 27-Apr-05 11-Oct-05 15-Mar-06 12-Sep-06
2015-02-02 Dubuque-PNG Groundwater (10-14)
Silty Sand Aquifer Wells
2/2/2015
-------
GROUNDWATER ANALYTICAL RESULTS
MIDAMERICAN ENERGY COMPANY
PEOPLES NATURAL GAS SITE
DUBUQUE, IOWA
Sample Location: D-6 D-6 D-6 D-6 D-6 D-6 D-6 D-6
Screened Unit: Silty Sand Silty Sand Silty Sand Silty Sand Silty Sand Silty Sand Silty Sand Silty Sand
Depth BTOC (feet): 37.0 37.0 37.0 37.0 37.0 37.0 37.0 37.0
Sample Date: 18-Apr-07 09-Sep-07 06-May-08 15-Sep-09 31-Mar-10 06-May-10 16-Sep-10 28-Apr-11
Cleanup
Analyte Units Level
Benzene
pg/L
5
556
1220
1030
966
1470
NS
1060
659
Toluene
M9/L
1,000
22.3
159
25.8
49.2
49.6
NS
44.8
39.5
Ethylbenzene
yg/L
700
582
795
948
870
700 C9
NS
737
424
Xylenes
yg/L
10,000
222
564
253
1140
345 C9
NS
356
230
2-Methylnaphthalene
yg/L
~
na
na
na
na
na
na
na
na
Dibenzofuran
Mg/L
—
na
na
na
na
na
na
na
na
Acenaphthene
mq/l
—
226
143
194
213
186
148
3.67
151
Acenaphthylene
mq/l
—
0.0850 U
0.0850 U
0.0850 U
4.35 U
1.35 U
1.74 U
13.9
0.0870 U
Anthracene
pg/L
—
54.6
19.4
37.9
33.6
29.7
14.8
0.0654 J
22.1
Benzo(a)anthracene
pg/L
0.1
22.9
8
18.5
13.4
14.5
4.83
0.00500 U
8.5
Benzo(a)pyrene
yg/L
0.2
20.9
9.36
18.2
12.4
13.4
4.9
0.00800 U
6.6
Benzo(b)fluoranthene
yg/L
0.1
16.6
5.74
12.8
7.56
0.0433 U
0.0280 U
0.0280 U
4.88
Benzo(g,h,i)perylene
yg/L
—
7.98
6.81
10
7.3
0.0124 U
2.38
0.00800 U
4.08
Benzo(k)fluoranthene
t-ig/L
0.29
7.24
2.83
6.44
4.54
0.0108 U
0.00700 U
0.00700 U
2.31
Chrysene
pg/L
2.9
18.6
8.74
17.7
10.1
0.124 U
2.47
0.00800 U
11.3
Dibenzo(a,h)anthracene
yg/L
. 0.013
1.73
1.07
1.95
1.56
0.140 J
0.0100 U
0.0100 U
0.336
Fluoranthene
yg/L
106
29.1
73.4
58.4
42.2
16
0.0100 U
20.1
Fluorene
pg/L
—
149
142
207
207
103
88.8
2.41
42.7
lndeno(1,2,3cd)pyrene
pg/L
0.1
10
5.07
9.59
6:91
0.00928 U
1.98
0.00600 U
3.95
Naphthalene
Mg/L
0:14
712
854
591
659
R
616
10.2
538
Phenanthrene
yg/L
—
181
86.3
158
153
120
53.2
0.226'
71.2
Pyrene
yg/L
" ¦
320
27
52.6
43.8
0.0263 U
-2.95
0.0170 U
1.82
2015-02-02 Dubuque-PNG Groundwater (10-14)
Silty Sand Aquifer Wells
2/2/2015 10 of 77
3 CZZ3 H~! CZ=? ~ t__J L__3 £ J L_J C 3 L ; ¦ ] ; I ; i : -
-------
EZZ3 CZU t~3 CD.' E^3 CZ3 Ed Cd L_J ¦ C_J E_j r_j •; ] ; ] _j ; ] ; ]
GROUNDWATER ANALYTICAL RESULTS
MIDAMERICAN ENERGY COMPANY
PEOPLES NATURAL GAS SITE
DUBUQUE, IOWA
Sample Location:
D-6
D-6
D-6
D-6
D-6
D-6
D-6
D-8
Screened Unit:
Silty Sand
Silty Sand
Silty Sand
Silty Sand
Silty Sand
Silty Sand
Silty Sand
Silty Sand
Depth BTOC (feet):
37.0
37.0
37.0
37.0
37.0
37.0
37.0
37.8
Sample Date:
20-Sep-11
25-Apr-12
25-Sep-12
01-May-13
05-Sep-13
26-Mar-14
22-Oct-14
29-Apr-09
Cleanup
Analyte
Units
Level
Benzene
ijg/L
5
1600
892
1170
1620
1890
1540
986
187
Toluene
Mg/L
1,000
¦219
75.8
103
100 ,.
300
116
.172
8.22
Ethylbenzene
mq/l
700
709
588 .
766
833
817
825
602
32.2
Xylenes
Mg/L
10,000
713
385
500
518
880
585
544
94.0
2-Methylnaphthalene
|jg/L
—
na
62.2
na
na
na ,
na
204 J-
na
Dibenzofuran
pg/L
~
na
na
na
na
na
na
na
na
Acenaphthene.
Mg/L
228
33.6
103 .
128
30.2
110
104 J-
.• 13.1
Acenaphthylene
ijg/L
-- ¦
225
<0.435
8.70 U
117
120
4.21 U
10.3 J-
14.2
Anthracene
Mg/L
—
48.5
11.8
25.1
21.8
4.71
5.45
5.98 J-
3.60
Benzo(a)anthracene
pg/L
0.1
15.8
4.58
¦ 11:8
7.5
2.16
0.554
2.35 J-
. 1.83
Benzo(a)pyrene
pg/L
0.2 •
13.8
3.65
10.3
6.8
1.44
0.618
1.85 J-
2.88
Benzo(b)fluoranthene
Mg/i-
0.1 ¦
13
3.12
5.77
4.34
3.48
0.525
2.28 J-
2^46 •
Benzo(g,h,i)perylene
jjg/L
- .
7.26
1.92
5
3.31
1.73
0.221
0.816 J-
1.25
Benzo(k)fluoranthene
i-jg/L
0.29
3.32
1.12
3.21
2.07
1.76
0.39
0.100 UJ
1.06
Chrysene
pg/L
2.9.
16.2
2.29
13.5
11.4
2.05
0.589
2.32 J-
2.18
Dibenzo(a,h)anthracene
pg/L
0.013
1.15
0.31 J
0.821
0.58
1.33
0.105 U
0.264 J-
0.183
Fluoranthene
pg/L
—
61.1 . ¦
14.8
41.9
31.7
8.43
, 4.9
7.33 J-
9.28
Fluorene
Mg/L
—
140
25.2
86.6
77.8
42.7
54.1
33.0 J-
17.2
lndeno(1,2,3cd)pyrene
kig/L
0.1 .
7.31 ;
1,67
5.18
2.68
3.83 \
0.348.
0.720 J7
1.00
Naphthalene
Mg/L
0.14
2610 B
264 ,
990
1130
1130
946
1440 J-
56.1
Phenanthrene
Mg/L
¦ —
163
35.4
98.6
85.1
44.4
34
48.2 J-
14.1
Pyrene
[jg/L
--
50.3
8.07
31.8
28.1
3.5
3.75'
8.41 J-
23.3
2015-02-02 Dubuque-PNG Groundwater (10-14)
Silty Sand Aquifer Wells
2/2/2015
11 of 77
-------
GROUNDWATER ANALYTICAL RESULTS
MIDAMERICAN ENERGY COMPANY
PEOPLES NATURAL GAS SITE
DUBUQUE, IOWA
Sample Location:
D-8
D-8
D-8
D-8
D-8
D-8
D-8
D-8
Screened Unit:
Silty Sand
Silty Sand
Silty Sand
Silty Sand
Silty Sand
Silty Sand
Silty Sand
Silty Sand
Depth BTOC (feet):
37.8
37.8
37.8
37.8
37.8
37.8
37.8
37.8
•' ^-1 •
Sample Date:
15-Sep-09
31-Mar-10
06-May-10
15-Sep-10
27-Apr-11
20-Sep-11
24-Apr-12
25-Sep-12
Cleanup
Analyte
Units
Level
Benzene
Hg/L
5
103
103
na
79.3
11;2
49.8
70.2
45.3
Toluene
M9/L
1,000
3.14
3.24
na
2.67
5.15
3.93
4.37
2.29
Ethylbenzene
. Mg/L
700
24.1
18.8 C9
na
15.4
25.2
20.7
24.7
13.7
Xylenes
Mg/L
10,000
35.8
28.7 C9
na
23.7
49.3
34.4
35.3
19.3
2-Methylnaphthalene
ng/L
—
na
na
na
na
na
na
3.81
2.81
Dibenzofuran
Mg/L
—
na
na
na
na
na
na
na
na
Acenaphthene
Mg/L
—
9.34
9.45
9.55
7.03
12.8
20.4
7.33
6.55-
Acenaphthylene
Mg/L
»
10.9
26.1
0.0870 U
0.0870 U
0.0870 U
22.2
9.4
7.66
Anthracene
Mg/L
—
1.04
1.83
0.445
0.85
0.834
1.94
1.07
0.739
Benzo(a)anthracene
Mg/L
0.1
0.159
0.625
0.179
0.136
0.0407 J
0.302
0.306
0.164
Benzo(a)pyrene
Mg/L
0.2
0.00800 U
0.00800 U
0.131 J
0.00800 U
0.00800 U
0.0399 J
0.00800 U.
0.0618 J
Benzo(b)fluoranthene
-MQ/L
0.1
0.0280 U
0.0280 U
0.0280 U
0.0280 U
0.0280 U
0.0280 U
0.028.0 U
0.0280 U
Benzo(g,h,i)perylene
pg/L
—
0.00800 U
0.00800 U
0.00800 U
0.00800 U
0.00800 U
0.00800 U
0.00800 U
0.00800 U
Benzo(k)fluoranthene
pg/L
0.29
0.509
0.00700 U
0.00700 U
0.00700 U
0.00700 U
0.00700 U
0.00700 U
0.00700 U
Chrysene-
mq/l
2.9
0.301
0.967
0.00800 U
0.185
0.0582 J
0.221
0.105
0.187
Dibenzo(a,h)anthracene
pg/L
0.013
0.138
0.0100 U
0.0100 U
0.0100 U
0.0100 U
0.0100 U
0.0100 U
0.0100 U
Fluoranthene
pg/L
¦ • ¦—
.1.37.
2.77
0.0100 U
1.03
.0.576
2.5
1.28
1.04
Fluorene
pg/L
10.6
6.75
0.0160 U
6.27
3.21
13.2
4.38
6.03
lndeno(1,2,3cd)pyrene
pg/L
0.1 '
0.00600 U
0.00600 U
0.00600 U
0.00600 U
.J).00600 U
0.00600 U
0.00600 U
0.00600 U
Naphthalene
k"g/L.
0,14
69.6
R
56.1
73.8
' 34.8 B
25 B
17.5
16.4
Phenanthrene
pg/L
—
2.91
5.19
2.94
2.43
1.79
3.59
2:22
1.68
P.yrene
Mg/L
—
0.563
0.017 U
0.0170 U
0.404
0.0170 U
1.38
0.745
0.633
2015-02-02 Dubuque-PNG Groundwater (10-14)
¦ Silty Sand Aquifer Wells
2/2/2015 12 of 77
C~3 3 O' CZ3 EZZ3 E J C__J CL-3 L—3 C 3 [ J i 3 I J L ] L_
-------
GROUNDWATER ANALYTICAL RESULTS
MIDAMERICAN ENERGY COMPANY
PEOPLES NATURAL GAS SITE
DUBUQUE, IOWA
Sample Location:
D-8
D-8
D-8
D-8
P-112
P-112
P-112
P-112
P-112
Screened Unit:
Silty Sand
Silty Sand
Silty Sand
Silty Sand
Silty Sand
Silty Sand
Silty Sand
Silty Sand
Silty Sand
Depth BTOC (feet):
37.8
37.8
37.8
37.8
38.8
38.8
38.8
38.8
38.8
Sample Date:
30-Apr-13
04-Sep-13
25-Mar-14
22-Oct-14
29-Feb-96
24-Sep-96
26-Nov-96
23-Jan-97
28-May-97
Cleanup
Analyte
Units
Level
Benzene
Mg/L
5
110
87.6
58.3
33.8
1
1 U
1 U
1 U
1 U
Toluene
Mg/L
1,000
3.99
3.8
3.21
2.55
1 U
1 U
1 u
1 U
1 U
Ethylbenzene
Mg/L
700
21.7
26.1
16
9.32
. 1
1 u
1 u
1 u
•1 u
Xylenes
Mg/L
10,000
32.8
39
28.2
20.5
na
1 u
na
na
1.U
2-Methylnaphthalene
Mg/L
—
na
na
na
1.41
10U
10 u
10 U
10 U
10 u
Dibenzofuran
pg/L
—
na
na
na
na
10 U
10 u
10 U
10 U
10 u
Acenaphthene
pg/L
-
9.37
2.37
9.55
3.76
10 U
10 u
10 U
10 U
10 u
Acenaphthylene
pg/L
--
12.1
46.2
12.5
3.06
10 U
10 u
10 U
10 U
10U
Anthracene
Mg/L
0.975
0.547
0.673
0.748
10 U
10 u
10U
10 U
10 u
Benzo(a)anthracene
Mg/L
0.1
0.104
0.0204 U
0.103 U
0.100 U
10 U
10 u
10 U
10 U
10 u
Benzo(a)pyrene
pg/L
0.2
• 0.103 U
0.0286 U
0.103 U
0.100 U
10 U
10 u
10 U
10 U
10 u
Benzo(b)fluoranthene
Mg/L
0.1
0.103 U
0.00714 U
0.103 U
0.100 U
10 U
10U
10 U
10 U
10 u
Benzo(g,h,i)perylene
pg/L
--
0.206 U
0.00816 U
0.206 U
0.100 U
10U
10 u
10 U
10 U
10 u
Benzo(k)fluoranthene
Mg/L
0.29
0.103 U
0.00816 U
0.103 U
0.100 U
10 u
10 u
10 U
10 U
10 u
Chrysene
Mg/i-
2.9
0.158
0.00816 U
0.103 U
0.100 U
10 u
10 u
10 U
10 U
10 u
Dibenzo(a,h)anthracene
pg/L
0.013
0.103 U
0.0102 U
0.103 U
0.0170 U
10 u
10 u
10 U
10 u
10 u
Fluoranthene
Mg/L
—
. 1.1
0.757
0.836
0.593 '
10 u
10 u
10 u
10 u
. 10 u
Fluorene
Mg/L
--
8.18
1.51
6.69
1.99
10 u
10 u
10 u
10 u
10 u
lndeno(1,2,3cd)pyrene
pg/L
0.1 "r
0.103 U
0,00612 U
0.103 U
0.100 U
10U
10 u
10 u
10 u
10 u
Naphthalene
Mg/L
0.14
38.7
25.4
35.7
15
4
.10 u
10 u
10U
10 u .
Phenanthrene
Mg/L
—
2.32
1.37
2.11
0.724
10 u
10 u
10U
10 u
10 u
Pyrene
Mg/L
"
0.714
0.229
0.445
, 0.665
'10U
10 u
10 u
•' 1-0 u
10U
2015-02-02 Dubuque-PNG Groundwater (10-14)
Silty Sand Aquifer Wells
2/2/2015
13 of 77
-------
GROUNDWATER ANALYTICAL RESULTS
MIDAMERICAN ENERGY COMPANY
PEOPLES NATURAL GAS SITE
DUBUQUE, IOWA
Sample Location:
P-112
P-112
P-112
P-112
P-112
P-112
P-112
P-112
P-112
Screened Unit:
Silty Sand
Silty Sand
Silty Sand
Silty Sand
Silty Sand
Silty Sand
Silty Sand
Silty Sand
Silty Sand
Depth BTOC (feet):
38.8
38.8
38.8
38.8
38.8
38.8
38.8
38.8
38.8
Sample Date:
25-Sep-97
19-Dec-97
17-Mar-98
16-Jun-98
29-Sep-98
10-Dec-98
24-Mar-99
23-Jun-99
28-Sep-99
Cleanup
Analyte
Units
Level
Benzene
M9/L
5
1 u
1 U
1 U .
1 U
1 U
1 U
110
0.27
0.25
Toluene '
MQ/L
1,000
1 U
1 U
1 U
1 U
1 U
1 U
17
1U
0.25
Ethylbenzene
MQ/L
700
1 u
1 u
1 u
¦ 1 U •
1 u
1 u
130
1 U
0.39
Xylenes
MQ/L
10,000
1 u
1 u
1 u
1 u.
1 u
2
76
0.85
1.1
2-Methylnaphthalene
Mg/L
10 u
10 u
10 u
10 u
10 u
10 u
4
10 U
10 U
Dibenzofuran
pg/L
—
10 u
10 u
10 u .
10 u
10 u
10 u
10 U
10 U
10 U
Acenaphthene
Mg/L
—
10 u
10 u
10 u
10 u
10 u
10 u
2
10 U
10 U
Acenaphthylene
pg/L
10 u
10 u
10U
10 u
10 u
10 u
10 U
10 U
10 U
Anthracene
pg/L
.. .
10 u
10 u
10 u
10 u
10 u
10 u
10 u
10 U
' 10 U
Benzo(a)anthracene
Mg/i-
0.1
10 u
10 u
10U
10U
10 u
10 u
10 u
10 U
10 U
Benzo(a)pyrene
Mg/L
0.2
.10 u
10 u
10 u
10 u
10 u
10 u
10 u
10 U
10 U
Benzo(b)fluoranthene
Mg/L
0.1
10 u
10 u
10 u
10U
10 u
10 u
10U
10 U
10 U
Benzo(g,h,i)perylene
Mg/i-
~
10 u
10 u
10 u
10 u
10 u
10 u <
10 u
10 U
10 U
Benzo(k)fluoranthene
pg/L
0.29
• 10 u
10 u
10 u
10 u
10 u
10 u
10 u
10U
- 10 U
Chrysene •
(jg/L
2.9
10 u
' 10 u
10 u
10 u
10 u
10 u
10 u
10 u
10 u
Dibenzo(a,h)anthracene
Mg n-
0.013
¦ 10 u
¦ 10 u
10 u
10U
10 u
10 u
10 u
10 u
10 u
Fluoranthene
Hg/L
10 u
10 u
10 u
10 u
10 u
10U
10 u
10 u
.10 u
Fluorene
tjg/L
--
1.0 u
10 u
10 u
10 u
10U
10 u
10U
10. u
10 u
lndeno(1,2,3cd)pyrene
M9'/L
0..1
10 u
10 u
10 u
10 u
10U
10 u
10 u
10 u
10 u
Naphthalene
MQ/L
.0.14
10 u
10 u
10 u
10 u
10 u
10 u
120
10 u
10 u
Phenanthrene
pg/L
—
10 u
10 u
10 u
10 u
10 u
10U
10 u
10 u
10 u
Pyrene
mq/l
10 u
10 u
10 u
10 u
10 u
-10 u
10 u
10U
10 u.
2015-02-02 Dubuque-PNG Groundwater (10-14)
Silty Sand Aquifer Wells
2/2/2015
14 of 77.
J
EZZ3 £~3 CH3 CZZ2
L_J C ]
-------
CZ2 C=D. EZD CUD ¦ ~ -CZD OIZD C_D l_J r_J L__J ;_J [ 3 L_J : ]
GROUNDWATER ANALYTICAL RESULTS
MIDAMERICAN ENERGY COMPANY
PEOPLES NATURAL GAS SITE
DUBUQUE,IOWA
Sample Location: P-112
P-112
P-112
P-112
P-112
P-112
P-112
P-112
P-112
Screened Unit: Silty Sand
Silty Sand
Silty Sand
Silty Sand
Silty Sand
Silty Sand
Silty Sand
Silty Sand
Silty Sand
Depth BTOC (feet): 38.8
38.8
38.8
38.8
38.8
38.8
38.8
38.8
38.8
Sample Date: 15-Dec-99
15-Mar-00
06-Jun-00
14-Sep-00
13-Dec-00
20-Mar-01
07-Jun-01
19-Sep-01
11-Dec-01
Cleanup
Analyte
Units Level
Benzene
M9/L
5
2.6
1.5
1.1
1 u
0.26 J
0.48 J
1 u
1 u
1 u
Toluene
i-jg/L
1,000
0.54
0.26
.1 u
1 u
0.25 J
0.24 J
1 u
. 1 u
1 u
Ethyl benzene
MQ/I-
700
2.9
0.45
1.2
1 u
1 u
1 u
1 u
1 u.
1 u
Xylenes
pg/L
10,000
. 2
1.4
1.2
0.7 J
0.95 J
0.88 J
1 u
1 u
1 u.
2-Methylnaphthalene
pg/L
10 U
1,0 u
10 u
10 u
10 u
10 u
10 u.
10 u
10 u
Dibenzofuran
mq/l
—
10 u
10 U
10 u
10 u
10 u
10 u
10 u
10 u
10 u
Acenaphthene
mq/l
—
10 u
10 U
10U
10 u
10 u
10.U
0.84 J
0.59 J
1.0 J
Acenaphthylene
pg/L
—
10 u
10 U
10U
10 u
10 u
10 u
10 u
10 u
10 u
Anthracene
pg/L
—
10 u
10 U
10 u
10 u
10 u
10 u
10 u
10 u
10 u
Benzo(a)anthracene
pg/L
0.1
10 u
10 U
10 u
10 u
10 u
10 u
10 u
10 u
10 u
Benzo(a)pyrene
pg/L
0.2
10 u
10 u
10 u
10 u
10 u
10 u
10 u
10 u
10 u
Benzo(b)fluoranthene
pg/L
0.1
10 u
10 u
10 u ;
10 u
10 u
10 u
10U
10 u
10 u
Benzo(g,h,i)perylene
pg/L
~
10 u
10 u
10 u
10 u
10 u
10U
10 u
10 u
10 u
Benzo(k)fluoranthene
pg/L
0.29
10 u
10 u
10 u
10U
10 u
10 u
10 u
10U
10 u
Chrysene
pg/L
2.9
10 u
10 u
10 u
10 u
10 u
10 u
10 u
10 u
10 u
Dibenzo(a,h)anthracene
pg/L
0.013
10 u
10 u
10 u
10 u
10 u
10 u
10 u
10 u
. 10 u
Fluoranthene
pg/L
10 u
10U
10 u.
10 u
10U .
10 u
10 u:
• -10U
10 u
Fluorene
pg/L
—
10 u
10 u
10 U '
10 u
10'. u
10 u
10 u
10 u
10 u
lndeno(1,2,3cd)pyrene
pg/L
0.1
. 10 u
10 u
10 u
10 u
10 u
10 u ,
. 10 u
10 U;
10 u
Naphthalene
pg/L
0.1.4
4
10 u
10 u
10 u
10 u
10 u
10 u
10 u
10 u
Phenanthrene
Mg/L
—
10 u
10 u
10 u
10 u
10 u
10U
10 u
10 u
1.0 J
Pyrene
pg/L
--
10 u
10U
10 u
10 u
10 U'
10 u
10U
10 u
0.73 J
2015-02-02 Dubuque-PNG Groundwater (10-14)
Silty Sand Aquifer Wells
2/2/2015
15 of 77
-------
GROUNDWATER ANALYTICAL RESULTS
MIDAMERICAN ENERGY COMPANY
PEOPLES NATURAL GAS SITE
DUBUQUE, IOWA
Sample Location:
P-112
P-112
P-112
P-112
P-112
P-112
P-112
P-112
P-112
Screened Unit:
Silty Sand
Silty Sand
Silty Sand
Silty Sand
Silty Sand
Silty Sand
Silty Sand
Silty Sand
Silty Sand
Depth BTOC (feet):
38.8
38.8
38.8
38.8
38.8
38.8
38.8
38.8
38.8
Sample Date:
13-Mar-02
07-Jun-02
18-Sep-02
04-Dec-02
10-Jun-03
30-Mar-04
15-Sep-04
14-Mar-05
25-Apr-05
Cleanup
Analyte
Units
Level
Benzene
Mg/f-
5
1 U
1 U
1 U ,¦
1 U
2 U
1:0 U
5.7
35
49
Toluene
mq/l
1,000
1 U
1 u
1 U "
1 U
2 U
0.61 Ja
1.4
2.9
3.7
Ethylbenzene '
pg/L
700
1 u
1 u
1 u
1 u
2 U
1.0 U
12
66
91
Xylenes
Mg/i-
10,000
1 u
1 u
0.95 J
1 p
7 U
2.6
14
57
75
2-Methylnaphthalene
pg/L
10 u
10 u
10 U
10 u
na
na
na
na
na
Dibenzofuran
Mg/L
—
10 u
10 u
10 U
10U
na
na
na
na
na
Acenaphthene
pg/L
—
0.93 J
0.69 J
1.1 J
. 1.1 J
0.54
1.3 Ja
1.7 Ja
5.6
2.0 Ja
Acenaphthylene
|jg/i-
--
10 U
10 U
10 u
10 u
0.1 U
4.4
13
100
50
Anthracene
Mg/L
—
10 U
10 U
10 u
10 u
0.1 U
0.053 Ua
0.049 U
0.050 U
0.050 U
Benzo(a)anthracene
pg/L
0.1
10 U
10 U
10 u
. 10 u
0.1 U
0.14 U
0.13 U
0.13 U
0.13 U
Benzo(a)pyrene
pg/L
0.2
10 U
10 U
10 u
10 u
0.1 U
0.14 U
0.13 U
0.13 U
0.13 U
Benzo(b)fluoranthene
Mg/L
0.1
10 U
10 U
10 u
10 u
0.1 U
0.053 U
0.049 U
0.050 U
0.050 Ua
Benzo(g,h,i)perylene
pg/L
--
10 u
10 u
10 u
10 u
0.1 U
0.21 U
0.19 U
0.20 U
0.20 U
Benzo(k)fluoranthene
pg/L
0.29
10U
10U
10 u
10 u
0.1 U
0.053 U
0.049 U
0.050 U
0.050 U
Chrysene
Mg/L
2.9
10 u
10 u
10 u
10 u
0.1 U
0.14 U
0.13 U
0.13 U
0.13 U
Dibenzo(a,h)anthracene
pg/L
0.013 ¦
10 u
10U
10 u
10 u
0.1 U
0.32 U
0,29 U
0.30 U
0.3 U
Fluoranthene
Mg/L
10 u
10 u
.10 u
10 u
0.12
0.14 U
0.13 U
0.13 U
0.13 U
Fluorene
Mg/L
10U
10 u
10 u
' 10 u
0.1 U
0.26 Ua
0.051 Ja .
0.25 U
0.25 U
lndeno(1,2,3cd)pyrene
Mg/L
0.1 ¦
10 u
10 u
10 u
10 u
0.1 U
0.14 U
0.13 U
0.13'U
0.13U
Naphthalene
pg/L
0.14
10 u
10 u
10 u
1.5
0.1 U
1.4 Ua
4.4
110
56
Phenanthrene
Mg/L
~
10 u
10U
10 u
.10 u
0.2
0.031 Ja
0.018 Ja
0.099 U
0.099 Ua
Pyrene
pg/L
—
10 u
10 u
10U
¦10 u
0.14
0.26 U
0.24 U
0.25 U
0.25 Ua
2015-02-02 Dubuque-PNG Groundwater (10-14)
Silty Sand Aquifer Wells
2/2/2015
16 of 77
-------
CI] C3.CZ3 Cj CZ) ~ (ZJ CZJ
GROUNDWATER ANALYTICAL RESULTS
MIDAMERICAN ENERGY COMPANY
PEOPLES NATURAL GAS SITE
DUBUQUE, IOWA
Sample Location:
P-112
P-112
P-112
P-112
P-112
P-112
P-112
P-112
P-112
Screened Unit:
Silty Sand
Silty Sand
Silty Sand
Silty Sand
Silty Sand
Silty Sand
Silty Sand
Silty Sand
Silty Sand
Depth BTOC (feet):
38.8
38.8
38.8 J
38.8
38.8
38.8
38.8
38.8
38.8
Sample Date:
11-Oct-05
15-Mar-06
12-Sep-06
18-Apr-07
20-Sep-07
06-May-08
0
1
O
0
1
o
00
29-Apr-09
16-Sep-09
Cleanup
Analyte
Units
Level
Benzene
Mg/L
5
29
270 -
286
,285
369 M1
551
554
786
1280
Toluene
mq/l
1,000
1.5
. 10 U
21.6
18.6
22.8 M1
11.2 L1
5.15
10.7
26.7
Ethylbenzene .
pg/L
700
57
500
715
- 536
585
789
- 671
890
831
Xylenes
pg/L
10,000
29
220
734
232
279 M1
236 L1
556
* 235
277
2-Methylnaphthalene
pg/L
~
na
na
na
na
na
na
na
na
na
Dibenzofuran
Mg/L
~
na
na
na
na
na
na
na
na
na
Acenaphthene
pg/L
--
18
11
32.4
54.3
55.4
84.7
79.4
80.6
101
Acenaphthylene
Mg/L
~
380
270
0.0850 U
0.0944 U
0.0850 U
0.0850 U
0.0870 U
0.0870 U
0.0870 U
Anthracene
pg^L
,
0.24 U
0.051 U
0.0113
0.0721 J
0.136 J
0.217
0.125 J
0.160 J
0.265
Benzo(a)anthracene
pg/L
0.1
0.62 U
0.13 U
0.00558
0.00333 U
0.00300 U
0.0100 J
0.00500 U
0.00500 U
0.00500 U
Benzo(a)pyrene
Mg/L
0.2
0.62 U
0.13 U
0.0130 U
0.0356 U
0.0320 U
0.0320 U
0.00800 U
0.00800 U
0.00800 U
Benzo(b)fluoranthene
pg/L
0.1
0.24 U
0.051 U
0.0150 U
0.0144 U
0.0130 U "
0.0130 U
.0.0280 U
0.0280 U
0.0280 U
Benzo(g,h,i)perylene
pg/L
--
0.95 U
0.20 U
0.0320 U
0.0100 U
0.00900 U
0.00900 U
0.00800 U
0.00800 U
0.00800 U
Benzo(k)fluoranthene
Mg/L
0.29
0.24 U
0.051 U
0.00900 U
0.0167 U
0.0150 U
0.0150 U
0.00700 U
0.00700 U
0.00700 U
Chrysene
pg/L
2.9
0.62 U
0.13 U
0.0338 J
0.00556 U
0.00500 U
0.00500 U
0.00800 U
0.00800 U
0.00800 U
Dibenzo(a,h)anthracene
pg/L
0.013
1.4 U
0.30 IT
0.0100 U
0.0111 U
0.0100 U
0.0100 U
0.0100 U
0.0100 U
0.0100 U
Fluoranthene
pg/L
—
0.22 Ja
0.13 U
0.0100 U
0.0111 U
0.0100 U
0.0100 U
0.0100 U
0.0100 U
0.198
Fluorene
pg/L
—
1.8
1.2
10.1
20.3
33.5
64.2
8.06
11.5
91.7
fndeno(1,2,3cd)pyrene
Mg/L
¦ 0.1
0.62 U
0.13 U
0.00700 U
0.00778 U
0.007
0.00700 U
0.00600 U
0.00600 U
0.00600 U
Naphthalene
Mg/L
,0.14
520
360
'167
727 B
719
,506
211
324
703
Phenanthrene
pg/L
—
0.48 U
0.10 li
0.544
2.4
1.65
2.95
2.17
2.63
3.52
Pyrene
Mg/L
-- '
1.2 U
0.25 U
0.0190 U
0.0211 U
0.0190 U
0.0248 J
0.0170 U
0.0170 U
0.0170 U
2015-02-02 Dubuque-PNG Groundwater (10-14)
Silty Sand Aquifer Wells
2/2/2015
17 of 77
-------
GROUNDWATER ANALYTICAL RESULTS
MIDAMERICAN ENERGY COMPANY
PEOPLES NATURAL GAS SITE
DUBUQUE, IOWA
Sample Location:
P-112
P-112
P-112
P-112
P-112
P-112
P-112
P-112
Screened Unit:
Silty Sand
Silty Sand
Silty Sand
Silty Sand
Silty Sand
Silty Sand
Silty Sand
Silty Sand
Depth BTOC (feet):
38.8
38.8
38.8
38.8
38.8
38.8
38.8
38.8
Sample Date:
31-Mar-10
06-May-10
14-Sep-10
28-Apr-11
20-Sep-11
25-Apr-12
25-Sep-12
01-May-13
Cleanup
Analyte
Units
Level
Benzene
pg/L
5
1580
na
1590
454
151
536
770
908
Toluene
pg/L
1,000
14.4
. na
24.8
5.89
1.0 U
9.47
14.4
5.87
Ethylbenzene
Mg/L
700
1170
na
798
173
74.6
355
451
581
Xylenes
mq/l
10,000
117
na
276 :
155
70.9 .
87.7
147
75.6
2-Methylnaphthalene
pg/L
—
na
na
na .
na
na
1.9
11.8
na
Dibenzofuran
pg/L
—
na
na
na
na
na
na
na
na
Acenaphthene
pg/L
~
109
¦120 MHA
113
41.4
50.2
39.8
70.5
64.3
Acenaphthylene
Mg/L
--
1.74 U
0.870 U
0.435 U
0.0870 U
56.8
0.870 U
0.870 U
0.421 U
Anthracene
pg/L
—
0.0100 U
0.192
0.432
0.126 J.
0.0100 U
0.209
0.293
0.341
Benzo(a)anthracene
Mg/L
0.1
0.00500 U
0.00500 U
0.00500 U.
0.0200 U
0.0200 U .
0.0200 U
0.0200 U
0.105 U ,
Benzo(a)pyrene
pg/L
0.2
0.00800 U
0.00800 U
0.00800 U
0.00800 U
0.00800 U
0.00800 U
0.00800 U
0.105 U
Benzo(b)fluoranthene
pg/L
0.1
0.0280 U
0.0280 U
0.0280 U
0.0280 U
0.0280 U
0.0280 U
0.0280 U
0.105 U
Benzo(g,h,i)perylene
pg/L
—
0.00800 U
0.00800 U
0.00800 U
0.00800 U
0.00800 U
0.00800 U
0.00800 U
0.211 U
Benzo(k)fluoranthene
pg/L
0.29
0.00700 U
0.00700 U
0.00700 U
0.00700 U
0.00700 U
0.00700 U
0.00700 U
0.105 U
Chrysene
pg/L
2.9
0.00800 U
0.00800 U
0.00800 U
0.00800 U
0.00800 U
¦ 0.00800 U
0.00800 U
0.105 U
Dibenzo(a,h)anthracene
pg/L
0.013
0.0100 U
0.0100 U
0.0100 U
0.0100 U
0.0100 U
0.0100 U
0.0100 U
0.105 U
Fluoranthene
pg/L
--
0.0100 U
0.0100 U..
0.0100 U
0.0100 U
0.0100 U
0.0100 U
0.0100 U
. 0.105 U
Fluorene
pg/L
—
53
54 MHA .
41.6
4.64
15.3
15.8
38.6
26.2
lndeno(1,2,3cd)pyrene
pg/L
0.1
0.00600 U
0.00600 U-
0.00600 U
0.00600 U
0.00600 U
0.00600 U
0.00600 U
0.105 U
Naphthalene
pg/L
0.14
R
429 MHA
877
6.63
5.09 B
69.7
179
47.4
Phenanthrerie
pg/L
—
0.100 u
0.00500 U,M1
5.05
1.39
0.00500 U
2.67
5.9
4.33
Pyrene
pg/L
0.0170 U
0.0170 U
0.0170 U
0.0170 U
0.0170 U
0.0170 U
0.0170 U
0.105 U
2015-02-02 Dubuque-PNG.Groundwater (10-14)
Silty Sand Aquifer Wells
2/2/2015 18 of 77
j * i
-------
czj cm en ~ cz
rz_j
GROUNDWATER ANALYTICAL RESULTS
MIDAMERICAN ENERGY COMPANY
PEOPLES NATURAL GAS SITE
DUBUQUE, IOWA
Sample Location:
P-112
P-112
P-112
Screened Unit:
Silty Sand
Silty Sand
Silty Sane
Depth BTOC (feet):
38.8
38.8
38.8
Sample Date: 05-Sep-13
26-Mar-14
22-Oct-14
Cleanup
Analyte
Units
Level
Benzene
Mg/L
5
220
804
65.8
Toluene
Mg/L
1,000
5.00 U
. 10
1.00 U
Ethylbenzene
M9/L
700
98.4
473
28.5
Xylenes
mq/l
• 10,000
19.2
70.2
16.1
2-Methylnaphthalene
Mg/L
—
na
na
0.223
Dibenzofuran
mq/l
—
na
na
na
Acenaphthene
pg/L
--
26.7
79.2
19.4
Acenaphthylene
pg/L
~
75.6
4.12 U
1.17
Anthracene
Mg/L
--
0.407
0.103
0.506
Benzo(a)anthracene
Mg/L
0.1
0.0208 U
0.103
0.100 U
Benzo(a)pyrene
pg/L
0.2
0.00833 U
0.103
0.100 U
Benzo(b)fluoranthene
Mg/L
0.1
0.0292 U
0.103
0.100 U
Benzo(g,h,i)perylene
pg/L
-
0.00833 U
0.206 U
0.100 U
Benzo(k)fluoranthene
mq/l
0.29
0.00729 U
0.103
0.100 U
Chrysene
Mg/L
2.9
0.00833 U
0.103
0.100 U
Dibenzo(a,h)anthracene
pg/L
0.013
0.0104 U
0.103
0.0710 U
Fluoranthene
pg/L
—
0.0104 U
0.103
0.100 U
Fluorene
Mg/L
—
70.2
33.9
4.26
lndeno(1,2,3cd)pyrene
,M9/L
0.1
0.00625 U
,0.103
0.100 U
Naphthalene
Mg/L
0.14
14.8
34.7
2.53
Phenanthrene
pg/L
—
3.39
5.38
2.32
Pyrene
pg/L
-- '
0.0177 U
0.103
0.100 U
2015-02-02 Dubuque-PNG Groundwater (10-14)
Silty Sand Aquifer Wells ¦
2/2/2015
19 of 77
-------
GROUNDWATER ANALYTICAL RESULTS
MIDAMERICAN ENERGY COMPANY
PEOPLES NATURAL GAS SITE
DUBUQUE, IOWA
Sample Location:
SE-2
SE-2
SE-2
SE-2
SE-2
SE-2
SE-2
SE-2
-
Screened Unit:
Silty Sand
Silty Sand
Silty Sand
Silty Sand
Silty Sand
Silty Sand
Silty Sand
Silty Sa
Depth BTOC (feet):
32.5
32.5
32.5
32.5
32.5
32.5
32.5
32.5
Sample Date:
25-May-94
29-Feb-96
25-Sep-96
26-Nov-96
23-Jan-97
30-May-97
30-Sep-97
19-Dec-
Cleanup
Analyte
Units
Level
Benzene
Mg/L
5
660
2300
1500
960
950
1200
510
940
Toluene
pg/i-
1,000
290
500
370
240
240
350
140
310
Ethylbenzene
MQ/L
700
1600
2300
890.
570
690
830
360
690
Xylenes
pg/L
10,000
1300
na
710
450
530
620
300
560
2-Methylnaphthalene
pg/L
78
400 U
72
51
74
64
37
73
Dibenzofuran
pg/L
—
200 U
400 U
8
150 U
9
100 U
100 U
10
Acenaphthene
pg/L
~
96
160
59
53
55
62
42
59
Acenaphthylene
pg/L
--
37
81
38
35
35
40
28
40
Anthracene
pg/L
—
200 U
400 U
1
150 U
1
100 U
100 U
1
Benzo(a)anthracene
pg/L
0.1
200 U
400 U
10 U
150 U
10 U
100 U
100 U
10 u
Benzo(a)pyrene
pg/L
0.2
200 U
400 U
10 U
150 U
10 U
100 U
100 U
10 u
Benzo(b)fluoranthene
pg/L
0.1
200 U
400 U
10 U
150 U .
10 U
100 U
100 U
10 u
Benzo(g,h,i)perylene
pg/L
--
200 U
400 U
' 10U
150 U
10 U
100 U
100 U
10 u
Benzo(k)fluoranthene
pg/L
0.29
200 U
400 U
10 U
150 U
10 U
100 U
100 U
10 u
Chrysene
pg/L
2.9
200 U
400 U
10 U
150 U
10 U
100 U
100 U
10 u
Dibenzo(a,h)anthracene
pg/L
0.013
200 U
400 U
10 U
150 U
10U
100 U
100 U
10 u
Fluoranthene
fjg/L
—
200 U
400 U
10 U
150 U
10 U
100 u
100 u
10 u
Fluorene
pg/L
—
200 U
400 U
13
150 U
13
100 u
100 u
10 u
lndeno(1,2,3cd)pyrene
pg/L
0.1
200 U
400 U
10 U
150 U
10 U
100 u
100 u
10 u
Naphthalene
pg/L
0.14
2000
5000
1200.
1300
1100
900
690
910
Phenanthrene
pg/L
—
13
400 U
12
150 U
13
12
100 U
12
Pyrene
pg/L
--
200 U
400 U
10 U
150 U
10 U
100 u
100 u
10 u
2015-02-02 Dubuque-PNG Groundwater (10-14)
Silty Sand Aquifer Wells (2)
2/2/2015 20 of 77
3 cm cud cm czd ~ czn c_j c 3 [—] l_j
-------
r~-i i—j (—i i—I i—) r—i r ~i r i
GROUNDWATER ANALYTICAL RESULTS
MIDAMERICAN ENERGY COMPANY
PEOPLES NATURAL GAS SITE
DUBUQUE, IOWA
Sample Location: SE-2
SE-2
SE-2
SE-2
SE-2
SE-2
SE-2
SE-2
Screened Unit: Silty Sand
Silty Sand
Silty Sand
Silty Sand
Silty Sand
Silty Sand
Silty Sand
Silty Sand
Depth BTOC (feet): 32.5
32.5
32.5
32.5
32.5
32.5
32.5
32.5
Sample Date: 17-Mar-98
16-Jun-98
29-Sep-98
25-Jun-99
28-Sep-99
15-Dec-99
15-Mar-00
06-Jun-00
Cleanup
Analyte
Units
Level
Benzene
M9/l
5 1000
840
260
. 210
- 1200
1400 .
890
580
Toluene
pg/L
1,000 250
190
10 U
130
150
140
170
160
Ethylberizene
pg/L
700 620
470
420
1400
940
890
660
460
Xylenes
pg/L
10,000 540
480
260
730
560
590
500
390
2-Methylnaphthalene
pg/L
— 62
33
11
50
17
6
34
na .
Dibenzofuran
pg/L
-- 8
150 U
5
10
10
11
9
na
Acenaphthene
pg/L
49
58
58
130
65
67
62
na
Acenaphthylene
pg/L
35
34
15
18
62
57
37
na
Anthracene
pg/L
-- 1
150 U
10 U
2
10 U
2
10U
na
Benzo(a)anthracene
pg/L
0.1 10 U
150 U
10 U.
10 U
10U
10 U
10U
na
Benzo(a)pyrene
pg/L
0.2 10 U
150 U
10 U
10U
10U
10 u
10 U
na
Benzo(b)fluoranthene
pg/L
0.1 10 U
150 U
10 U
10U
10U
10 u
10 U
na
Benzo(g,h,i)perylene
pg/L
10 U
150 U ,
10 U
10 U
10U
10 u
10 U
na
Benzo(k)fluoranthene
pg/L
0.29 10 U
150 U
10 U
10 U
10 U
10 u
10 U
na
Chrysene
pg/L
2.9 10 U
150 U
10 U
10 U
10 U
10U
10U .
na
. Dibenzo(a,h)anthracene
pg/L
0.013 10 U
150 U
10 U
10 U
10U
10 u
10 U
na
Fluoranthene
pg/L
10U
150 U '
10 U
10 u..
10 U
4
• 10 U
na -
Fluorene
pg/L
- 14
150 U
8
. 20
17
24
18
na
lndeno(1,2,3cd)pyrene
pg/L
0.1 10 U
150 U
10 U
10 U
10,U
10 U
,10 U
na
Naphthalene
pg/L
0.14 1200
840
620
1900
1700
1500
1200
na-
Phenanthrene
pg/L
- . 10
150 U
6
15
15
23
13
pa
Pyrene
pg/L
- 10 U
150 U
10 U
10 U
10 U
4
10 U
na
2015-02-02 Dubuque-PNG Groundwater (10-14)
Silty Sand Aquifer Wells (2)
2/2/2015
21 of 77
-------
GROUNDWATER ANALYTICAL RESULTS
MIDAMERICAN ENERGY COMPANY
PEOPLES NATURAL GAS SITE
DUBUQUE, IOWA
Sample Location: SE-2
SE-2
SE-2
SE-2
SE-2
SE-2
SE-2
SE-2
-
Screened Unit: Silty Sand
Silty Sand
Silty Sand
Silty Sand
Silty Sand
Silty Sand
Silty Sand
Silty Sand
Depth BTOC (feet): 32.5
32.5
32.5
32.5
32.5
32.5
32.5
32.5
Sample Date: 15-Sep-00
15-Dec-00
21-Mar-01
07-Juh-01
20-Sep-01
11-Dec-01
14-Mar-02
05-Jun-02
¦ '
Cleanup
Analyte
Units
Level
Benzene
pg/L
5 400
5.3
150
150
¦130
200
ns
39
Toluene
pg/L
1,000 140
1.6
38
45
28
24
ns
9.4
Ethylbenzene
pg/L
700 300
1.7
37
65
90
120 .
ns
11
Xylenes
mq/l
10,000 240
3.7
110
110
89
120
ns
37
2-Methylnaphthalene
pg/L
40
4 J
9.6 J
16
6.6 J
19
ns
10 U
Dibenzofuran
pg/L
8 J
4 J
3.1 J
3.2 J
3.1 J
4.1 J
ns
0.99 J
Acenaphthene
pg/L
. - 45
23
18
23
20
27
ns
3:8 J
Acenaphthylene
pg/L
24
3 J
5.2 J
6.5 J
5.7 J
13
ns
0.58 J
Anthracene
pg/L
1 J
10 U
10 U
0.75 J
10 U
0.76 J
ns
10 U
Benzo(a)anthracene
pg/L
0.1 10 U
10 U
10 U
10 U
10 U
10U .
ns
10U
Benzo(a)pyrene
pg/L
0.2 10 U
10 U
10 U
10 U
10 U
10 U
ns
10 U
Benzo(b)fluoranthene
pg/L
.0.1 10 U
10 U
10 U
10 U
• 10U
10U
ns
10 U
Benzo(g,h,i)perylene
pg/L
- 10 U
10 U
10 U
10 U
10 U
10 U
. ns
10 U
Benzo(k)fluoranthene
pg/L
0.29 10 U
10 U
10 U
10 U
10 U
10 U
ns
10 U
Chrysene
pg/L
2.9 10 U
10 U
10 U
10 U
10 U
10 U
ns
10 U
Dibenzo(a,h)anthracene
pg/L
0.013 10 U
10 U
10 U
10 U
10 U
10 U
ns
10 U
Fluoranthene
pg/L
10 U
. 10 U
10 U
10 U
. 10U
10 U
ns
10 U
Fluorene
pg/L
13
8 J
6.5 J
7.1 J
6.3 J
7.4 J
ns
3.5 J
lndeno(1,2,3cd)pyrene
pg/L
0.1 10 U
10 U
10 U
10 U
10 U
10 U
ns
10 U
Naphthalene
pg/L
. 0.14 630
10 U
40
59
60
320
ns
10U
Phenanthrene .
pg/i-
11
5 J
3.6 J
3.8 J
3.3 J
4.4 J
ns
. 1.6 J
Pyrene
pg/L
» 10 U
10 U
10 U
10 U
10 U
10 U
ns
10 U
2015-02-02 Dubuque-PNG Groundwater (10-14)
Silty Sand Aquifer Wells (2)
2/2/2015 22 of 77
~ C : L j L J r J ; j ; ; ; j ¦; ,
-------
cms czd c=] 'en ~ cm czd ¦ o c_j l_j
GROUNDWATER ANALYTICAL RESULTS
MIDAMERICAN ENERGY COMPANY
PEOPLES NATURAL GAS SITE
DUBUQUE, IOWA
Sample Location:
SE-2
SE-2
SE-2
SE-2
SE-2
SE-2
SE-2
SE-2
Screened Unit:
Silty Sand
Silty Sand
Silty Sand
Silty Sand
Silty Sand
Silty Sand
Silty Sand
Silty Sand
Depth BTOC (feet):
32.5
32.5
32.5
32.5
32.5
32.5
32.5
32.5
Sample Date:
18-Sep-02
05-Dec-02
11 -Oct-05
15-Mar-06
12-Sep-06
17-Apr-07
19-Sep-07
05-May-08
Cleanup
Analyte
Units
Level
>
Benzene
MQ/L.
5
88
160
23
22
34.1.
15.9
24.3
21.1
Toluene
1,000
8.7
8.8
1.0 U
1.0 U
1.64
1.00 U
1.27
1.00 U
Ethylbenzene
Mg/i-
700
23
44
26
8.7
35.5
2.35
27.6
6.62
Xylenes
mq/l
10,000
54
59
10 '
4.5
23.2
3.00 U
32
11.2
2-Methylnaphthalene
M9/L
--
10 U
15 •
na
na
na
na
na
na
Dibenzofuran
mq/l
2.1 J
3.3J
na
na
na
na
na
na
Acenaphthene
Mg/L
--
5.8 J
20
41
35
39.1
25.8
33.5
26.2
Acenaphthylene
Mg/L
—
1.5 J
9.0J
120
61
9.99
0.100 U
0.0850 U
0.0850 U
Anthracene
M9 /L
—
10 U
10 U
0.43
0.19 Ja
0.355
0.664
0.099 J
0.162 J
Benzo(a)anthracene
pg/L
0.1
10U
10U
0.13 U
0.64 U
0.00300 U
0.00353 U
0.0151 J
0.00300 U
Benzo(a)pyrene
Mg/L
0.2
10 U
10 U
0.13 U
0.64 U'
0.0320 U
0.0376 U
0.0320 U
0.0320 U
Benzo(b)fluoranthene
mq/l
0.1
10 U
10U
0.051 U
0.25 U
0.0130 U
0.0153 U
0.0130 U
0.0130 U
Benzo(g,h,i)perylene
MQ/L
-
10 U
10 U
0.20 U
0.99 U
0.00900 U
0.0106 U
0.00900 U
0.00900 U
Benzo(k)fluoranthene
pg/L
0.29
10 U
10U
0.051 U
0.25 U
0.0150 U
0.0176 U
0.0150 U
0.0150 U
Chrysene
Mg/L
2.9
10 u
10 u
0.13 U
0.64 U
0.00500 U
0.00588 U
0.00500 U
0.00500 U
Dibenzo(a,h)anthracene
|jg/i
0.013
10 u
10 u
0.30 U
1.5 U*
0.0100 U
0.0118 U
0.0782 J
0.0100 U
Fluoranthene
Mg/L
—
10 u
10 u
0.92
0.64 U
0.68
0:0118 U
0.536
0.412
Fluorene
Mg/L
—
10U
5.8J :
3.9
2.5
9.01
7.08
12.7
13.5
lndeno(1,2,3cd)pyrene
Mg/L
0.1
10U 1
10U
0.13 U
0.64 U
0.00700 U
0.00824 U
0.00700 U
0.00700 U
Naphthalene
Mg/L
0.14
10 u
260
1.3 U
6.4 U
4.91
0.41 B
6.43
9.21
Phenanthrene
Mg/L
—
2.4 J
3.2J
0.73
0.22 Ja
1.16
0.00824 U
0.00700 U
0.00700 U
Pyrene
pg/L
--
10 U "
10U
0.45 M
1.2 U
0.0774 J
0.766
0.479
0.171 J
2015-02-02 Dubuque-PNG Groundwater (10-14)
Siity Sand Aquifer Wells (2)
2/2/2015
23 of 77
-------
GROUNDWATER ANALYTICAL RESULTS
MIDAMERICAN ENERGY COMPANY
PEOPLES NATURAL GAS SITE
DUBUQUE, IOWA
Sample Location:
SE-2
SE-2
SE-2
SE-2
SE-2
SE-2
SE-2
SE-2
Screened Unit:
Silty Sand
Silty Sand
Silty Sand
Silty Sand
Silty Sand
Silty Sand
Silty Sand
Silty Sand
Depth BTOC (feet):
32.5
32.5
32.5
32.5
32.5
32.5
32.5
32.5
Sample Date:
30-Sep-08
28-Apr-09
15-Sep-09
30-Mar-10
05-May-10
15-Sep-10
27-Apr-11
19-Sep-11
Cleanup
. Analyte
Units
Level
Benzene
' Mg/L
5
31.6
20.8
45
30.1
na
22.1
99.6
112
Toluene
M'g/L
1,000
1.00 U
1.00 U
3,63
1.00 U
na
1.17
1
5.88 .
Ethylbenzene
mq/l
700
13
5.41
73.4
3.58
na
6:'12
20.7
78.9
Xylenes
pg/L
10,000
9.2
3.00 U
41.5
6 U
na
9.26
16.9
43
2-Methylnaphthalene
pg/L
—
na
na
na
na
na
na
na
na
Dibenzofuran
pg/L
~
na
na
na
na
na
na
na
na
Acenaphthene
pg/L
33.8 .
27.2
50.1
35.1
29.5
38.1
14.6
21.2
Acenaphthylene
ms/l
-
0.0870 U
0.0870 U
0.0870 U
0.0870 U
0.0870 U
6.05
6.15
4.18
Anthracene
M9/L
—
0.186 J
0.130 J
0.312
0.0100 U
0.0454 J
0.0100 U
0.0100 U
0.265
Benzo(a)anthracene
M9/L
0.1
0.00500 U
0.00500 U
0.00500 U
0.00500 U
0.00500 U
0.00500 U
0.0200 U
0.0200 U
Benzo(a)pyrene
pg/L
0.2
0.00800 U
0.00800 U
0.00800 U
0.00800 U
0.00800 U
0.00800 U
0.00800 U
0.00800 U
Benzo(b)fluoranthene
pg/L
0.1
0.0280 U
0.0280 U
0.0280 U
0.0280 U
0.0280 U
0.0280 U
0.0280 U
0.0280 U
Benzo(g,h,i)perylene
pg/L
-
0.00800 U
0.00800 U
0.00800 U
0.00800 U
0.00800 U
0.00800 U
0.00800 U
0.00800 U
Benzo(k)fluoranthene
pg/L
0.29
0.00700 U
0.00700 U
0.00700 U
0.00700 U
0.00700 U
0.00700 U
0.00700 U
0.00700 U
Chrysene
mq/l
2.9 .
0.00800 U
0.00800 U
0.0159 J
0.00800 U
0.00800 U
0.00800 U
0.00800 U
0.00800 U
Dibenzo(a,h)anthracene
pg/L
0.013
0.0100 U
0.0100 U
0.0100 U
0.0100 U
0.0100 U
0.0100 U
0.0100 U
0.0100 U
Fluoranthene
pg/L
. 0.657
0.505
0.0100 U
0.0100 U
0.0100 U
0.977
0.296
0.619
Fluorene
pg/L
—
14.4
12.2
23.6
9.26
3,77
10.8
1.89
6.35
lndeno(1,2,3cd)pyrene
pg/L
0.1
0.00600-U
0.00600 U
0.00600 U
0.00600 U
0.00600 U
0.00600 U
0.00600 U
0.00600 U
Naphthalene
pg/L
0.14
1.27
0.277
26.6
R
0.0460 U
1.11
3.09 B
96.6 B
Phenanthrene
pg/L
—
0.00500 U
0.00500 U
0.00500 U
0.00500 U
0.00500 U
0.00500 U
0.00500 U
0.00500 U
Pyrene
pg/L
—
0.386
.0.298
<0.0170 U
0.0170 U
0.0170 U
0.143 J
0.0170 U
0.324
2015-02-02 Dubuque-PNG Groundwater (10-14)
Silty Sand Aquifer Wells (2)
2/2/2015
24 of 77
en ~. cm cz3 cn ~ ~ ¦ a
c_j c J
-------
CT3 C3- a EZ3 EHJ ETZ3 CUD CZZ) CT3 L_J t J C_J
GROUNDWATER ANALYTICAL RESULTS
MIDAMERICAN ENERGY COMPANY
PEOPLES NATURAL GAS SITE
DUBUQUE, IOWA
Sample Location: SE^2
SE-2
SE-2
SE-2
SE-2
SE-2
SS-6
SS-6
Screened Unit: Silty Sand
Silty Sand
Silty Sand
Silty Sand
Silty Sand
Silty Sand
Silty Sand
Silty Sand
Depth BTOC (feet): 32.5
32.5
32-5
32.5
32.5
32.5
31.5
31.5
Sample Date: 25-Apr-12
25-Sep-12
30-Apr-13
03-Sep-13
25-Mar-14
21-Oct-14
11-Jan-05
14-Mar-05
Cleanup
Analyte
Units
Level
Benzene
mq/l
5 59.3
35.4
23.7
92.4
44
239.
2000
2000
Toluene
mq/l
1,000 1.00 U
1.00 U
1.00 U
1.97
1.00 U
13.3
380
350
Ethylbenzene
700 10.6
3.06
12.3
52.5
1.94
120
670
390
"Xylenes
pg/L
10,000 4.96
4.7
14.5
20.8
3.02
65.
1200
960
2-Methylnaphthalene
pg/L
0.308
0.839
na
na
na
0.594
na
na
Dibenzofuran
pg/L
na
na
' na
na
na
na
na
na
Acenaphthene
pg/L
18.2
26.5
19:6
6.55
24.7
18.5
130 U
90 Ja
Acenaphthylene
pg/L
2.99
3.89
2.57
28.3
5.32
7.47
2600
1900
Anthracene
pg/L
<0.0100
0.361
0.24
0.0104 U
0.142
0.152
37*
77
Benzo(a)anthracene
Mg/i-
0.1 0.0200 U
0.0200 U
0.102 U
0.0208 U
0.104 U
0.100 U
16
43 -
Benzo(a)pyrene
pg/L
0.2 0.00800 U
0.00800 U
0.102 U
0.00833 U
0.104 U
0.100 U
10
. 28
Benzo(b)fluoranthene
Mg/L
0.1 0.0280 U
0.0280 U
0.102 U
0.0292 U
0.104 U
0.100 U
5.6
18
Benzo(g,h,i)perylene
, Mg/L
0.00800 U
0.00800 U
0.204
0.00833 U
0.208 U
0.100 U
10 U
9.6-Ja
Benzo(k)fluoranthene
pg/L
0.29 0.00700 U
0.00700 U
0.102 U
0.00729 U
0.104 U
0.100 U
3.4
9.7
Chrysene
mq/l
2.9 0.00800 U
0.0216 J
0.102 U
0.00833 U
0.104.U
0.100 U
12
34
Dibenzo(a,h)anthracene
pg/L
0.013' 0.0100 U
0.0100 U
0.102 U
0.0104 U
0.104 U
0.0170 U
16 U
29 U .
Fluoranthene
pg/L
0.0100 u
0.653
. 0,318
0.0104 U
0.428
0:111
'53
170
Fluorene
pg/L
» 4.4
7.25
6,14
3.21
.4.47
2.45
69
130
lndeno(1,2,3cd)pyrene
Mg/L
0.1 0.00600 U
0.00600 U
0.102 U
0.00625 U
¦ 0.104 U
0.100U
3.8 Ja
10 Ja
Naphthalene
pg/L
0.14 5.97
2.24
6.41
12"
1.94
111
3100
2100
Phenanthrene
pg/L
0.00500 U
0.647
0,652
0.00521 U
0.104 U
0.128
120 H
280
Pyrene
pg/L
0.0170 U
0.222
0.194
0.0177 U
0.178
0.208
19 M
110 '
2015-02-02 Dubuque-PNG Groundwater (10-14)
Silty Sand Aquifer Wells (2)
2/2/2015
25 of 77
-------
GROUNDWATER ANALYTICAL RESULTS
MIDAMERICAN ENERGY COMPANY
PEOPLES NATURAL GAS SITE
DUBUQUE, IOWA
Sample Location: SS-6
SS-6
SS-6
SS-6
SS-6
SS-6
SS-6
SS-6
Screened Unit: Silty Sand
Silty Sand
Silty Sand
Silty Sand
Silty Sand
Silty Sand
Silty Sand
Silty^ Sand
Depth BTOC (feet): 31.5
31.5
31.5
31.5
31.5
31.5
31.5
31.5
Sample Date: 10-Oct-05
14-Mar-06
11-Sep-06
17-Apr-07
19-Sep-07
05-May-08
30-Sep-08
15-Sep-09
Cleanup
Analyte
Units
Level
Benzene
pg/L
5 2700
2300
2130
1670
1540
1660
1880
1560
Toluene
pg/L
1,000 490
500
431
446
380
471
392
453
Ethylbenzene
pg/L
700 670
620
635
747
909
1080
586
919
Xylenes
pg/L
. 10,000 100 U
. 1400
1250
• 1390
1750
1570
1290 .
1470
2-Methylnaphthalene
pg/L
na
na
na
na
na
na
na
na
Dibenzofuran
pg/L
na
na
na
na
na
na
na
na.
Acenaphthene
pg/L
120 U
24 U
40.6
86.3
32.6
25.3
37
18.4
Acenaphthylene
pg/L
2000
1600
315
393
378
294
433
209
Anthracene
pg/L
97
28
33.3
42.3
31.2
12.3
21.1
4.23
Benzo(a)anthracene
pg/L
CO
LO
o
13
11.7
17.6
17.4
5.76
10.8
0.471
Benzo(a)pyrene
pg/L
0.2 35
8.2
11.3
15.9
17.2
6.11
1.0.4
0.475
Benzo(b)fluoranthene
pg/L
0.1 17
4.5
8.66
12.9
8.47
4.36
7.03
0.324
Benzo(g,h,i)perylene
tjg/i-
9.9
2.4
3.66
5.77
9.15
2.87
5.52
0.205
Benzo(k)fluoranthene
pg/L
0.29 7.3
1.8 M
4.32
5.31
5.43
2.39
4.27
0.159
Chrysene
pg/L
Z9 39
9.7
11.7
16.6
16
5.39
9.96
0.527
Dibenzo(a,h)anthracene
pg/L
0.013 14 U
2.7 J*
1
1.45
1.57
0.652
1.01
0.0377 J
Fluoranthene
pg/L
- . 190
46
33.1 .
71.1
. 42
17.1
35.2
2.91
Fluorene
pg/L
140
60
152
185
248
156
143
98.6
lndeno(1,2;3cd)pyrene
pg/L
CO
o
3.1
.4.56
7.34
7.45 •
2.94
4.84
0.18
Naphthalene
pg/L
0.14 2200
1600
.1390 '
1950 B
1760
1740
1670
1720
Phenanthrene
pg/L
270
.87
. 81.8
111
112
56.7
80
25.5
Pyrene
pg/L
130
33 M
136
186
34.5
" 11.8
22.1
1.74
2015-02-02 Dubuque-PNG Groundwater (10-14)
Silty Sand Aquifer Wells (2)
2/2/2015 26 of 77
] czjda czn dj ~ C-3 t j t 3 l 3 l 5 ; ; : ; ; : : ; ; l_
-------
£T3 C=3 £~Z3 CUD CZ3 CUD CT3 CHU C__J L_J £ J t / r i
GROUNDWATER ANALYTICAL RESULTS
MIDAMERICAN ENERGY COMPANY
PEOPLES NATURAL GAS SITE
DUBUQUE, IOWA
Sample Location:
SS-6
SS-6
SS-6
SS-6
SS-6
SS-6
SS-6
Screened Unit:
Silty Sand
Silty Sand
Silty Sand
Silty Sand
Silty Sand
Silty Sand
Silty Sand
Depth BTOC (feet):
31.5
31.5
31.5
31.5
31.5
31.5
31.5
Sample Date:
31-Mar-10
06-May-10
15-Sep-10
27-Apr-11
20-Sep-11
24-Apr-12
25-Sep-12
Cleanup
Analyte
Units
Level
Benzene
M9/L
5
1750
na
1710
2800
2720
2610
2080
Toluene
M9/L
1,000
451
na
521
504
583
555
482
Ethylbenzene
pg/L
700
1120
na
928
1610
1480
1390
1100
Xylenes
|jg/L
10,000
: 1670
na
1560
1790
1860
1820
1560
2-Methylnaphthalene
mq/l
—
na
na
na
na
na
306
455
Dibenzofuran
pg/L
-
na
na
na
na
na
na
na
Acenaphthene
pg/L
--
72.9
0.110 U
50.1
47.7
33.9
25.6
30.2
Acenaphthylene
pg/L
-
634
647
611
495
752
186
436
Anthracene
pg/L
-
32.8
46.2
48.6
18.1
54.8
15.9
17.1
Benzo(a)anthracene
ijg/L
0.1
12.7
18.4
16.4
4.96
19.1
5.36
6.51
Benzo(a)pyrene
pg/L
0.2
11.3
16.6
13.7
3.83
17.3
4.17
5.65
Benzo(b)fluoranthene
Mg/L
0.1
0.0566 U
0.0280 U
9.03
2.63
12
3.61
3.69
Benzo(g,h,i)perylene
Mg/i-
--
0.0162 U
4.73
7.36
2.18
8.55
2.75
2,42
Benzo(k)fluoranthene
Mg/L
0.29
0.0141 U
0.00700 U
0.00700 U
1.34
6.85 J .
1.74
2.05
Chrysene
pg/L
.'2.9
13.3
9.39
19.6
6.06
20.6
3.95
7.31
Dibenzo(a,h)anthracene
pg/L
0.013
0.0202 U
0.0100 U
1.29
0.227
0.0100 U
0.434
0.449
Fluoranthene
pg/L
—
0.101 U
52
48.8
11.7
" 61.1
16.9
21.3
Fluorene
pg/L
—
1,79
222
- 158
67
201
58.3
101
lndeno(1,2,3cd)pyrene
pg/L
0.1
3.77
5.29
6.61
2.07
7.92
. 2.5 ..
2.3
Naphthalene
pg/L
0.14
R
2800
2750
3930 B
4080 B
1360 ...
2540
Phenanthrene.
pg/L
—
97.8
131
139
65.4
170
54.9
72.8
Pyrene
pg/L
—
16.9
7.8
22.9
1.51
49.3
10.4
14.9
2015-02-02 Dubuque-PNG Groundwater (10-14)
Silty Sand Aquifer Wells (2)
2/2/2015
27 of 77
-------
GROUNDWATER ANALYTICAL RESULTS
MIDAMERICAN ENERGY COMPANY
PEOPLES NATURAL GAS SITE
DUBUQUE, IOWA
¦ T-
Sample Location:
SS-6
SS-6
SS-6
SS-6
SS-8
SS-8
SS-8
SS-8
Screened Unit:
Silty Sand
Silty Sand
Silty Sand
Silty Sand
Silty Sand
Silty Sand
Silty Sand Silty Sane
Depth BTOC (feet):
31.5
31.5
31.5
31.5
33.4 ,
33.4
33.4
33.4
: Sample Date:
30-Apr-13
04-Sep-13
26-Mar-14
21 -Oct-14
11-Jan-05
14-Mar-05
10-Oct-05
14-Mar-06
Cleanup
Analyte
Units
Level
Benzene
Mg/L
5
4670
3590
3170
2810
1.6
1.6
1.1
1.0 U
Toluene
mq/l
1,000
796
640
527
503
1.0 U
1.0 U
1.0 u
1.0 u
Ethylbenzene
MQ/L
700
2540
2000
1750
-vj
o
o
1.0 U
1.0 U
1.0 u
1.0 u
Xylenes
ijg/L
10,000
2890
2340
2100
1920
1.0 U
1.0 U
1.0 u
1.0 u
2-Methylnaphthalene
—
na
na
na
449
na
na
na
na
Dibenzofuran
Jjg/L
--
na
na
na
na
na
na
na
na
Acenaphthene
|jg/L
--
57.9
31.3
52.9
23.8
0,59 Ja
0.50 Ja,
2.5 U
0.48 Ja
Acenaphthylene
--
462
868
0.421 U
233
47
38
47
18
Anthracene
ijg/L
—
15.3
2.13
8.2
2.71
0.051 U*
0.050 U
0.049 U
0.050 U
Benzo(a)anthracene
MQ/L
0,1
3.5
0.686
1.72
1.00 U
0.13 U
0.13 U
0.13 U
0.13 U
Benzo(a)pyrene
pg/l
0.2
2.97
2.72
1.84
1.00 U
' 0.13 U
0.13 U
0.13 U
0.13 U
Benzo(b)fluoranthene
Mg/L
0.1
2.08
1.75
1.11
1.00 U
0.051 U
0.050 U
0.049 U
0.050 Ua
Benzo(g,h,i)perylene
Mg/L
--
1.23
1.08
0.654
1.00 U
0.20 U
0.20 U
0.20 U
0.20 U
Benzo(k)fluoranthene
Mg/L
0:29
1.13
1.22 .
0.877
1.00 u-
0.051 U
0.050 U
0.049 U
0.050 U
Chrysene
pg/L
2.9
4.32
0.278
1.36
1.00 U
0.13 U
0.13 U
0.13 U
0.13 U
Dibenzo(a,h)anthracene
pg/L
0.013
0.26
0.0819 J
0.145
0.0170 U
0.31 U
0.30 U
0.29 U
0.30 U*
Fluoranthene
Hg/L
—
14.1
4
8.28
1.65
0.13 U
0.13 U
0.13 U
0.13 U
Fluorene
|jg/L
¦
109
144
72.4
42.3
0.26 U
0.25 U
0.25 U
0.25 U
lndeno(1,2,3cd)pyrene
pg/L
0.1,
1.28
1.2,1.
0.714 .
1.00 U
0.13 U
0.13 U
0.13 U
0.13 U
Naphthalene
MQ/L
0.14
1820
23.5
3230
3690
0.66 Ja
0.36 Ja
1.3 U
0.31 Ja
Phenanthrene
ijg/L
—
53.4
108
40.7
32.1
0.039 Ja
0.099 Ua
0.098 U
0.099 U
Pyrene
Mg/L
-
* 12.3
20.2
4.19
- 1.71
0:20 Ja
0.25 U
0:25 U
0.25 U
2015-02-02 Dubuque-PNG Groundwater (10-14)
Silty Sand Aquifer Wells (2)
2/2/2015 28 of 77
CZj CZ3 CZ3 cm CZ3 CZ3 CUD CZJ C-U C 3 L—j C__> L_J i__J [ : L__J i 2 [ J 1__
-------
r—i t—i c—n r—n ic—t t—i t 1 r—i
t—i
GROUNDWATER ANALYTICAL RESULTS
MIDAMERICAN ENERGY COMPANY
PEOPLES NATURAL GAS SITE
DUBUQUE, IOWA
Sample Location:
SS-8
SS-8
SS-8
SS-8
SS-8
SS-8
SS-8
SS-8
Screened Unit:
Silty Sand Silty Sand
Silty Sand
Silty Sand
Silty Sand
Silty Sand
Silty Sand
Silty Sand
Depth BTOC (feet):
33.4
33.4
33.4 .
33.4
33.4
33.4
33.4
33.4
Sample Date:
11 -Sep-06
17-Apr-07
19-Sep-07
05-May-08
30-Sep-08
28-Apr-09
15-Sep-09
30-Mar-10
Cleanup
Analyte
Units
Level
Benzene
Mg/L
5
1.0 u
1.0 U
1.00 u
1.00 u
1.00 u
1.00 u
1.00 u
1.00 u
Toluene -
Mg/L
1,000
1.0 u
1.0 u
- 1.00 u
1.00 u
1.00 u
1.00 u
1:00 U
1.00 u
-Ethylbenzene-
MQ/L
700
1.0 u
1.0 u
1.00 u
1.00 u
1.00 u
1.00 u
1.00 u
100 u
Xylenes
Mg/L
10,000
3.0 U
3.0 U
3.00 U
3.00 U
3.00 U
3.00 U
3.00 U
6.00 U
2-Methylnaphthalene
Mg/i-
--
na
na
na
na
na
na
na
na
Dibenzofuran
^g/L
--
na
na
na
na
na
na
na
na
Acenaphthene
ijg/L
~
0.701
0.107 J
0.0490 U
0.181 J
0.484
0.0220 U
0.0220 U
0.0220 U
Acenaphthylene
pg/L
—
0.0850 U
0.0850 U
0.0850 U
0.0850 U
0.0870 U
0.0870 U
0.0870 U
0.0870 U
Anthracene
W-
—
0.185 J
0.0100 U
0.0100 U
0.0100 U
0.0145 J
0.01.00 U
0.0126J
0.01.00 U
Ben'zo(a)anthracene
M'g/L
0.1
0.00300 U
0.00300 U
0.0.149 J
0.00300 U
0.00500 U
0.00500 U
0.00658 J
0.00500 U
Benzo(a)pyrene
|jg/L
0.2
0.0320 U
0.0320 U
0.0320 U
0.0320 U
0.00800 U
0.00800 U
0.0154 J
0.00800 U
Benzo(b)fluoranthene
Mg/L
0.1
0.0130 U
0.0130 U
0.0130 U
0.0130 U
0.0280 U
0.0280 U
0.0280 U
0.0280 U
Benzo(g,h,i)perylene
Mg/L
~
0.00900 U
0.00900 U
0.00900 U
0.0323 J
0.00800 U
0.00800 U
0.00800 U
0.00800 U
BenzQ(k)fluo.ranthene
M9/L
0.29
0.0150 U
0.0150 U
0.0150 U
0.0150 U
0.00700 U
0.00700 U
0.00700 U
0.00700 U
Chrysene"
ijg/L
2.9
0.00500 U
0.00500 U
0.0368 J
0.0148 J
0.00800 U
0.00800 U
0.00891 J
0.00800 U
Dibenzo(a,h)anthracene
pg/L
0.013'
0.0100 U
0.0100 U
0.0100 U
0.0100 U
0.0100 U
0.0100 U
0.0100 U
0.0100 U
Fluoranthene
pg/L
-- .
0.01-00 u
0.0288 J
0.0326 J
0.0153 J .
0.0100,U
0.0100 U
0:0100 U
0:0100 U
Fluorene
Mg/L
¦ —
0.647
0.0100 U
0.868
0.777
1.12
0.0160.U
0.0160 U
0.0160 U
lndeno(1,2,3cd)pyrene
pg/L
0.,1
0.00700 U
0.00700 U
0.00700 U.
0.00700 U
0.00600 U
0.00600 U
0.00600 U
0,00600 U
Naphthalene
Mg/L
0.14
0.0551 J
0.165 B
0.0540 U
0.0857 J
0.0460 U
0.0460 U
0.0460 U
R
Phenanthrene
Mg/L
-
0.0151 J
0.00700 U
0.0732 J
0.00700 U
0.00500 U
0.00500 U
0.00500 U
0.00500 U
Pyrene
mq/l
—
0.0303 J
- 0.0556 J
0.0408 J
0.0190 U
0.022 J
0.0170 U
' 0.0170 U
0.0170 U
2015-02-02 Dubuque-PNG Groundwater (10-14)
Silty Sand Aquifer Wells (2)
2/2/2015
29 of
-------
GROUNDWATER ANALYTICAL RESULTS
MIDAMERICAN ENERGY COMPANY
PEOPLES NATURAL GAS SITE
DUBUQUE, IOWA
Sample Location: SS-8
SS-8
SS-8
SS-8
SS-8
SS-8
SS-8
SS-8
Screened Unit: Silty Sand
Silty Sand
Silty Sand
Silty Sand
Silty Sand
Silty Sand
Silty Sand
Silty Sand
Depth BTOC (feet): 33.4
33.4
33.4
33.4
33.4
33,4
33.4
33.4
Sample Date: 15-Sep-10
27-Apr-11
20-Sep-11
25-Apr-12
25-Sep-12
01-May-13
05-Sep-13
26-Mar-14
Cleanup
Analyte
Units
Level
Benzene
MQ/L
5 1.00 U
1.05
7.93
1.95
1.00 u
0.50 U
4.09
0.500 U
Toluene
Mg/L
1,000 1.00 U
1.00 U
1.00 U
1.00 U
1.00 u
1.00 U
1.00 U "
1.00 U
Ethylbenzene
mq/l
700 1.00 U
1.00 U
1.82
1.00 U
1.00 u
1:00 u
1.00 U
1.00 U
Xylenes
MQ/L
10,000 3.00 U
3.00 U
3.00. U
3.00 U
3.00 U
3.00 U
3.00 U
3.00 U
2-Methylnaphthalene
MQ/L
na
na
na
0.100 U
0.100 u
na
na
na
Dibenzofuran
pg/L
na
na
na
na
na
na
na
na
Acenaphthene
pg/L
0.0220 U
0.642
1.96
0.145 J
<0.0220
0.81
0.0229 U
0.311
Acenaphthylene
pg/L
0.0870 U
0.0870 U
0.0870 U
0.0870 U
0.0870 U
0.417 U
0.0906 U
0.412 U
Anthracene
pg/L
0.0100 U
0.0151 J
0.0286 J
0.0100 U
0.0100 U
0.104U
0.0104 U
0.103 U
Benzo(a)anthracene
pg/L
0.1 0.00500 U
0.0200 U
0.0200 U
0.0200 U
0.0200 U
0.104:U
0.0208 U
0.103 U
Benzo(a)pyrene
pg/L
0:2 0.00800 U
0.00800 U
0.00800 U
0.00800 U
0.00800 U
0.104 U
0.00833 U
0.103 U
Benzo(b)fluoranthene
pg/L
0.1 0.0280 U
0.0280 U
0.0280 U
0.0280 U
0.0280 U
0.104 U
0.0292 U
0,103 U
Benzo(g,h,i)perylene
pg/L
0.00800 U
0.00800 U
0.00800 U
0.00800 U
0.00800 U
0.208 U
0.00833 U
0.206 U
Benzo(k)fluoranthene
pg/L
0.29 0.00700 U
0.00700 U
0.00700 U
0.00700 U
0.00700 U
0.104 U
0.00729 U
0.103 U
Chrysene
pg/L
2.9 0.00800 U
0.00800 U
0.00800 U
0.00800 U
0.00800 U
0.104 U
0.00833 U
0.103 U
Dibenzo(a,h)anthracene
pg/L
0.013 0.0100 U
0.0100 U
0.0100 U
0.0100 U
0.0100 U
0.104 U
0.0104 U
0.103 U
Fluoranthene
pg/L
0.0100 U
0.0100 U
0.0100 U
0.0100 U
0.0100 u
0.104 U
0.0104 U
0.158
Fluorene
pg/L
0.84
0.0160 U
0.0160 U
0.0160 U
0.0160 U
0.104 U
0.0167 U
0.116
lndeno(1,2,3cd)pyrene
pg/L
0.1 0.00600 U
0.00600 U
0.00600 U
0.00600 .U
0.00600 U
. 0.104 U
0.00625 U
0.103 U
Naphthalene
pg/L
0.14 0.0460 U
1.8 B
2.53 B
0.26
0.146
0.208 U
0.0479 U
0.256
Phenanthrene
pg/L
0.00500 U
0.00500 U
0.00500 U
0.00500 U
0.00500 U
0.104 U
0.0511 U
0.125
Pyrene
pg/L
0.0170 U
0.0170 U
' 0.0234 J
0.0170 U
0.0170 U
0.104 U
0.0177 U
0.178
2015-02-02 Dubuque-PNG Groundwater (10-14)
Silty Sand Aquifer Wells (2)
2/2/2015
30 of 77
CZD CZD CUD
CZ-3 CI_J
-------
czd era ern en: ci=3 ca tru c_j . c__? cl_j l__' c__j
GROUNDWATER ANALYTICAL RESULTS
MIDAMERICAN ENERGY COMPANY
PEOPLES NATURAL GAS SITE
DUBUQUE, IOWA
Sample Location:
SS-8
SS-9
SS-9
SS-9
SS-9
SS-9
SS-9
SS-9
Screened Unit:
Silty Sand
Silty Sand
Silty Sand
Silty Sand
Silty Sand
Silty Sand
Silty Sand
Silty Sand
Depth BTOC (feet):
33.4
28.0
28.0
28.0
28.0
28.0
28.0
28.0
Sample Date: 22-Oct-14
11-Jan-05
14-Mar-05
10-Oct-05
15-Mar-06
11-Sep-06
17-Apr-07
19-Sep-07
Cleanup
Analyte
Units
Level
Benzene
MQ/L
5
5.02
29.0
24
. 29
30
32.8
33.8
25.1
Toluene
M9/L
1,000
1.00 U
2.5
2.1
2.6
2.5.
2.57
2.59
2.38
Ethylbenzene
700
1.00 U
1.2
1
1.3
1.1
1.11
1.33
1.29
Xylenes
pg/L
10,000
3.00 U -
3.0
1.6
3.6
3.5
3.84
4.32
5:64
2-Methylnaphthajene
pg/L
--
0.104 U
na
na
na
na
na
na
na
Dibenzofuran
¦ pg/L
~
na
na
na
na
na
na
na
na
Acenaphthene
pg/L
~
0.976
4
5
10 '
8.9
10.5
13.4
14.8:
Acenaphthylene
pg/t
~
0.221
4.1
2.2 M
3.3 M
0.83 Ja
0.0850 U
0.0850 U
0.0850 U
Anthracene
pg/L
—
0.104 U
0.015 Ja*
0.048 Ua
0.033 Ja
0.049 Ua
0.0162 J
0.0156 J
0.0100 U
Benzo(a)anthracene
pg/L
0.1
0.0521 U
0.13 U
0.12 U
0*13 U
0.13 U
0.00300 U
0.00300 U
0.00300 U
Benzo(a)pyrene
pg/L
0.2
0.104 U
0.13 U
0.12 U
0.13 U
0.13 U
0.0320 U
0.0320 U
0.0320 U
Benzo(b)fluoranthene
pg/L
0.1
0.0521 U
0.052 U
0.048 U
0.049 U
0.049 U
0.0130 U
0.0130 U
0.0130 U
Benzo(g,h,i)perylene
pg/L
—
0.104 U
0.21 U
0.19 U
0.20 U
0.20 U
.0.00900 U
0.00900 U
0.00900 U
Benzo(k)fJuoranthene
Mg/L
0.29
0.104 U
0.052 U
0.048 U
0,049 U
0.049 U
0.0150 U
0.0150 U
0.0150 U
Chrysene
pg/L
2.9
0.104 U
0.13 U
0.12 U
0.13 U
0.13 U
0.00500 U
0.00500 U
0.00500 U
Dibenzo(a,h)anthracene
|jg/L
0.013
0.0170 U
0.31 U
0.29 U
0.29 U
0.29 U*
0.0100 U
0.0100 U
0.0100 U
Fluoranthene
pg/L
0.104.U
0.13 U
0.12 U.
0.064 Ja
0.13 U
0.0100 U
0.0318 J
0.0308 J
Fluorene
pg/L
—
0.104 U
0.084 Ja
0.14 Ja
0.21 Ja
0.08.8 Ja
0.205
0.322
0.298
lndeno(1,2,3cd)pyrene
pg/t
0.1
0.0521 U
0.13 U
0.12 U ,
0.13 U
0.13 U
0.00700 U
0.00700 U
0 00700 U
Naphthalene
pg/i
0.14
0.0726
6.8
6.2
7.6
3.1
6.88
10.5 B
9.88
Phenanthrene
pg/L
-
0.104 U .
0.17
0.19
0.28
0.12
0,15
0.214
0.213
Pyrene
pg/L
¦ --
0.104 U
0.26 U
0.24 U
0.045 Ja
0.25 U
0.0533 J
0.0844 J
0.0222 J'
2015-02-02 Dubuque-PNG Groundwater (10-14)
Silty Sand Aquifer Wells (2)
2/2/2015
31 of 77
-------
GROUNDWATER ANALYTICAL RESULTS
MIDAMERICAN ENERGY COMPANY
PEOPLES NATURAL GAS SITE
DUBUQUE, IOWA
Sample Location: SS-9
SS-9
SS-9
SS-9
SS-9
SS-9
SS-9
SS-9
Screened Unit: Silty Sand
Silty Sand
Silty Sand
Silty Sand
Silty Sand
Silty Sand
Silty Sand
Silty Sand
Depth BTOC (feet): 28.0
28.0
28.0
28.0
28.0
28.0
28.0
28.0
Sample Date: 06-MayT08
30-Sep-08
28-Apr-09
15-Sep-09
30-Mar-10
05-May-10
15-Sep-10
27-Apr-11
Cleanup
Analyte
Units
Level
Benzene
pg/L
5 ¦ 51.1
31.2
49.5
53.8
49.5
na
,44.6
42.6
Toluene
mq/l
1,000 4.33
1.34 L5
4.28
4.84
3.11
na
3.55
3.44
Ethylbenzene
mq/l
700 3.13
1.56
1.57
2.43
1.75 '
ria
¦ 1.67
2.08
Xylenes
pg/L
10,000 7.
3.03
4.65
7.21
6.00 U
na-
6.00
5.6
2-Methylnaphthalene
.pg/L
na
na
na
na
na
na
na
na
Dibenzofuran
pg/L
na
na
na
na
na
na
na
' na
Acenaphthene
MQ/L
9.18
18.1
19.2
19.9
. 27.6
26.5
27.7
11.8
Acenaphthylene
MQ/L
1.82
3.18
0.0870 U
0.0870 U
5.88 M1
0.0870 U
0.0870 U
1.7
Anthracene
pg/L
0.0102 J
0.0100 U
0.0100 U
0.0136 J
0.0100 U
0.0100 U
0.0211 J
0.0309 J
Benzo(a)anthracene
pg/L
0.1 0.00300 U
0.00500 U
0.00500 U
0.00500. U
0.00500 U
0.00500 U
0.00500 U
0.0200 U
Benzo(a)pyrene
Mg/L
0.2 0.0320 U
0.00800 U
0.00800 U
0.00800 U
0.00800 U M1
0.00800 U
0.00800 U
0.00800 U
Benzo(b)fluoranthene
pg/i-
0.1 0.0130 (J
0.0280 U
0.0280 U
: 0.0280 u
0.0280 U
0.0280 U
0.0280 U
0.0280 U
Beinzo(g,h,i)perylene
pg/L
0.00900 U
0.00800 U
0.00800 U
0.OO8OO U
0.00800 U
0.00800 U
0.00800 U
0.00800 U
Benzo(k)fluoranthene
Mg/L
0.29 0.0150 U
0.00700 U
0.00700 U
0.00700 U
0.00700 U
0.00700 U
0.00700 U
0.00700 U
Chrysene
mq/l
2.9, 0.00500 U
0.00800 U
0.00800 U
0:00800 U
0.00800 U
0.00800 U
0.00800 U
0.00800 U
Dibenzo(a,h)anthracene
Mg/L
0.013 0.0100 U
¦ 0.0100 U
0.0100 U
0.0100 u
0.0100 U
0.0100 U.
0.0100 U
0.0100 U
Fluoranthene
pg/L
0.0365 J
0.025 J
0.0100 U
0.0100 u
0.0100 U
0.0100 U
0.0100 U
0.0237 J
Fluorene
pg/L
0.366
0.637
0.582
0.704
0.794
0.0160 U
0.834
0.179 J
lndeno(1,2,3cd)pyrene
pg/L
0.1 - 0.00700 U
0.00600 U
0.00600 U.
0.00600 U
0.00600.U
0.00600 U
0.00600 U
0.00600 U
Naphthalene
pg/L
0.14 13.3
6.32
14.1
. 16.3
R
8.27
11.5
8.93 B
Phenanthrene
pg/L
0.277
0.208
0.00500 U
0.271
0.000500 U
0.16
0.269
0.43
Pyrene
pg/L
0.0248 J
0.0170 U
0.0170 U
0.0170 U
0.0170 U
0.0170 U
0.0170 U
0.0170 U
2015-02-02 Dubuque-PNG Groundwater (10-14)
Silty Sand Aquifer Wells (2)
2/2/2015 32 of 77
CHI CUD » I r 1 CT~") m . CZD rr-n r ¦") r i r 3 r_ ; r ¦ - 1 • < ......
-------
C3 czs a czd czd cud ca . u_j c j
GROUNDWATER ANALYTICAL RESULTS
MIDAMERICAN ENERGY COMPANY
PEOPLES NATURAL GAS SITE
DUBUQUE, IOWA
Sample Location:
SS-9
SS-9
SS-9
SS-9
SS-9
SS-9
SS-9
Screened Unit:
Silty Sand
. Silty Sand
Silty Sand
Silty Sand
Silty Sand
Silty Sand
Silty Sand
Depth BTOC (feet):
28.0
28.0
28.0
28.0
28.0
28,0
28.0
Sample Date:
19-Sep-11
25-Apr-12
24-Sep-12
30-Apr-13
04-Sep-13
25-Mar-14
21-0ct-14
Cleanup
Anaiyte
Units
Level
Benzene
mq/l
5
36.8 .
54.5
89
97.6
100
176
116.
Toluene
pg/L
1,000
3.46
5.14 -
6.99
7.45
8.28
9.41 ¦
8.77
Ethylbenzene-
M9/L-
700
1.87
2.05
3.31 r
3.76
3.74
7.27
5.52
Xylenes
M9/L
10,000
5.82
7.54
11,3
12.4
12:8
19.3
15.3
2-Methylnaphthalene
—
na
0.49
0.901
na
na
na
0.669
Dibenzofuran
Mg/L
¦ --
na
na
na
na
na
na
' na
Acenaphthene-
pg/L
~ ¦
35.8
17.2
13.6
11.9
0.314
10.7
9.6
Acenaphthylene
pg/L
--
0.0870 U
0.0870 U
0.0870 U
0.417 U
1.82
0.412 U
0.92
Anthracene
ijg/L
—
0.0296 J
0.0184 J
0.0491 J
0.104 U
0.0102 U
0.103 U
0.100 U
Benzo(a)anthracene
(jg/L
: 0.1
0.0200 U
0.0200 U
0.0200 U
0.104 U
0.0204 U
0.103 U
0.100 U
Benzo(a)pyrene
pg/L
0.2
0.00800 U
0.00800 U
0.00800 U
0.104 U
0.00816 U
0.103 U
0.100 U
B~enzo(b)fluoranthene
Mg/L
0.1
0.0280 U
0.0280 U
0.0280 U
0.104 U
0.0286 U
0.103 U
0.100 U
Benzo(g,h,i)perylene
pg/L
--
0.00800 U
0.00800 U
0.00800 U
0.208 U
0.00816 U
0.206 U
0.100 U
Benzo(k)fluoranthene
i-jg/L
0.29
0.00700 U
0.00700 U
0.00700 U
0.104 U
0.00714 U
0.103 U
0.100 U
Chrysene
Mg/L
2.9
0.00800 U
0.00800 U
0.00800 U
0.104 U
0.00816 U
0.103 U
0.100 U
Dibenzo(a,h)anthracene
ijg/L
0.013
0.0100 U
0.0100 U
0.0100 U
0.104 U
0.0102 U
0.103 U
0.0170 U
Fluoranthene
Mg/L
—
0.0100 U
0.0100 U
0.0100-U
0.104 U ¦
0.0102 U
0.103 U
0.167
Fluorene
ijg/L
—
¦ 0.647
0.0160 U
0.0160 U
0.104 U
0.0163U
0.103 U
0.131
lndeno(1,2,3cd)pyrene
pg/L
0.1
0.00600 U
0.00600 U
- 0.00600 U
0:104 U
0.061-2 U
0.103'U
0,100 U
Naphthalene
pg/L'
0.14
13.3 B
' 1.46
21.7
19.8
22.3
24.3
29.1
Phenanthrene.
pg/L.
-
0.315
0.243
0.286
0.237
0.206
0.275
0.155
Pyrene
Mg/L
—
0.0170 U
0.0226 J
0:0537 J
0.104 U
0.0173
0.103 U
0.672
2015-02-02 Dubuque-PNG Groundwater (10-14)
Silty Sand Aquifer Wells (2)
2/2/2015
33 of 77
-------
GROUNDWATER ANALYTICAL RESULTS
MIDAMERICAN ENERGY COMPANY
PEOPLES NATURAL GAS SITE
DUBUQUE, IOWA
•
Sample Location:
W-113
W-113
W-113
W-113
W-113
Wt1 13
W-113
W-113
Screened Unit:
Silty Sand
Silty Sand
Silty Sand
Silty Sand Silty Sand
Silty Sand
Silty Sand
Silty Sand
Depth BTOC (feet):
34.8
34.8
34.8
34.8
34.8
34.8
34.8
34.8
Sample Date:
10-Oct-05
14-Mar-06
11-Sep-06
17-Apr-07
19-Sep-07
05-May-08
30-Sep-08
28-Apr-09
Cleanup
Analyte,
Units
Level
Benzene
pg/L
5
1.0 u
1.0 U
5.00 U
1.00 u
1.00 u
1.00 u
1.00 u
1.00 u
Toluene '
pg/L
1,000
1.0 u
1.0U
5.00 U
1.00 u
1.00 u
1.00 u
1.00 u
1.00 u
Ethylbenzene
pg/L
700
1.0 u
1.0U
5.00 U
1.00 u
1.00 u
1.00U
1.00 u
1.00 u
Xylenes
pg/L
' 10,000
1.0 U'
1.0 u
15.00 U
3.00 U
3.00 U
3.00 U
3.00 U
3.00 U
2-Methylnaphthalene
pg/L
—
na
na
na
na
na
na
na
na
Dibenzofuran
mq/l
-
na
na
na
na
na
na
na
na
Acenaphthene
Mg/L
—
2.5 U
2.4 U*
0.0490 U
0.0490 U
0.0490 U
0.0490 U
0.0331 J
0.0702 J
Acenaphthylene
pg/L
--
1.3 U
1.2 U*
0.0850 U
0.0850 U
0.0850 U
0.0850 U
0.0870 U
0.0870 U
Anthracene
pg/L
--
0.050 U
0.048 Ua*
0.0100 J
0.0100 U
0.0100 U
0.0100 U
0.0100 U
0,0100 U
Benzo(a)anthracene
pg/L
0.1
0.13 U
0.12 U
0.0101 J
0.00300 U
0.0199 J
0.00903 J
0.00500 U
0.0102 J
Benzo(a)pyrene
pg/L
0.2
0.13 U '
0.017 Ja
0.0320 U
0.0320 U
0.0320 U
0.0320 U
0.00800 U
0.00800 U
Benzo(b)fluoranthene
pg/L
0.1.
0.050 U
0.048 U
0.0130 U
0.0130 U
0.0130 U
0.0130 U
0.0280 U
0.0280 U
Benzo(g,h,i)perylene
pg/L
—
0.20 U
0.19 U
0.00900 U
0.00900 U
0.0199 J
0.00900 U
0.00800 U
0.00800 U
Benzo(k)fluoranthene
pg/L
0.29
0.050 U
0.048 U
0.0150 U
0.0150 U
0.0150 U
0.0150 U
0.00700 U
0.00700 U
Chrysene
Mg/L
2.9
0.13 U
0.12 U
0.01 J
0.00500 U
- 0.0304 J.
0.0270 J
0.00800 U
0.00800 U
Dibenzo(a,h)anthracene
pg/L
0.013
0.30 U
0.29 U
0.0100 U
0.0100 U
0.01
0.0100 U
0.0100 U
0.0100 U
Fluoranthene
pg/L
0.13 U
0.045 Ja
. 0.0100 U
0.0100 U
0.0157 J
0.0100 U
0.0100 u
0.0100 U
Fluorene
pg/L
--
0.25 U
0.24 U*
0.0100 u
0.0100 u
0.0100 U
0.0100 U
0.0160 U
0.0160 U
lndeno(1,2,3cd)pyrene
pg/L
0.1
0.13 U
0.12 U
0.00700 U
0.007.00 U
0.00700 U
0.00700 U
0.00600 U
0.00600 U
Naphthalene
pg/L
0.14
1.3 U
1.2 U*
0.0540 U
0.197
0.0540 U
0.702
0.0460 U
0.0460 U
Phenanthrene
pg/L
—
0.099 U
0.030 Ja
0.0197 J
0.00700 U
0.00700 U
0.00700 U
0.00500 U
0.00500 U
Pyrene
pg/L
—
0.25 U
0:040 Ja
0.0213 J
0.0325 J
0.0232 J
0.0190 U
0.0170 U
0.0170 U
2015-02-02 Dubuque-PNG Groundwater (10-14) . .
Silty Sand Aquifer Wells (3)
2/2/2015 34 of
C-3 CZJ CZJ C=Z] tlU L_J ' C 3 [ J Lw ¦ L_J I i ; J r } ; :
-------
GROUNDWATER ANALYTICAL RESULTS
MIDAMERICAN ENERGY COMPANY
. PEOPLES NATURAL GAS SITE
DUBUQUE, IOWA
Sample Location: W-113
W-113
W-113
W-113
W-113
W-113
W-113
W-113
Screened Unit: Silty Sand
Silty Sand
Silty Sand
Silty Sand
Silty Sand
Silty Sand
Silty Sand
Silty Sand
Depth BTOC (feet): 34.8
34.8
34.8
34.8
34.8
34.8
34.8
34.8
Sample Date: 15-Sep-09
30-Mar-10
15-Sep-10
27-Apr-11
19-Sep-11
25-Apr-12
25-Sep-12
30-Apr-13
Cleanup
Analyte
Units
Level
Benzene
pg/L
5 1.00 U
1.00 u
1.2
4.11
1.00 u
1.00 u
1.00 u
0.50 U
'Toluene
M9/L
1,000 1.00 u
1.00 u
1.00 U
1.00 U
¦1.00'u
1.00 u
1.00 u
1.00 U
Ethylbenzene
mq/l
700 1.00 U
1.00 u
1.00 U
1.86
1.28
1.13
1.44
1.56
Xylenes
Mg/L
10,000 3.00 U
6.00 U
3.00 U
3.00 U
3.00 U
3.00 U
3.00 U
3.00 U
2-Methylnaphthalene
pg/L
na
na
na
na
na
0.111 U
0.197
na
Dibenzofuran
Mg/L
na
na
na
na
na
na
na
na
Acenaphthene
pg/L
0.136 J
0.0220 U
0.0861 J
0.0220 U
0.0282 J
0.0244 U
0.149 J
0.211 U
Acenaphthylene
pg/L
0.0870 U
0.0870 U
0.0870 U
0,0870 U
0.0870 U
0.0967 U
0.0870 U
0.421 U
Anthracene
Mg/L
0.0100 U
0.0100 U
0.0100 U
0.0100 U
0.012 J
0.0111 U
0.0443 J
0.105 U
Benzo(a)anthracene
Mg/L
0.1 0.00500 U
0.00500 U
0.00696 J
0.0200 U
0.0200 U
0.0222 U
0.0200 U
0.105 U
Benzo(a)pyrene
pg/L
0.2 0.00800 U
0.00800 U
0.00800 U
0.00800 U
0.00800 U
0.00889 U
0.00925 J '
0.105 U
Benzo(b)fluoranthene
pg/L
0.1 0.0280 U
0.0280 U
0.0280 U
0.0280 U
0.0280 U
0.0311 U
0.0280 U
0.105 U
Benzo(g,h,i)perylene
pg/L
0.00800 U
0.00800 U
0.00800 U
0.00800 U
0.00800 U
0.00889 U
0.00800 U
0.211 U
Benzo(k)fluoranthene
pg/L
0.29 0.00700 U
0.00700 U
0.00700 U
0.00700 U
0.00700 U
0.00778 U
0.00700 U
0.105 U
Chrysene
Mg/L
2.9 0.00800 U
0.00800 U
0.0175 J
0.00800 U
0.00800 U
0.00889 U
0.0217 J
0.105 U
Dibenzo(a,h)anthracene
m9/l
0.013 0.0100 U
0.0100 U
0.0100 U
0.0100 U
0.0100 U
0.0111 U
0.0100 U
. 0:105 U
Fluoranthene
Mg/L
0.0100 U
0.0100 u
0.0100 U
0.0100 u
0.046 J
0.0111 u.
0.0631 J
.0.105 U
Fluorene
Mg/L
0.0160 U
0.0160 U
0.0160 U
0.0160 U
0.0160 U
0.0178 U
0.123 J
0.105 U
lndeno(1,2,3cd)pyrene
Mg/L
0.1 0.00600 U
0.00600 U
0.00600 U
0.00600 U
0.00600 U
0.00667 U
0.00600 U
0.105 U
Naphthalene
Mg/L
0.14 0.0460 U
R
0.129
0.0460 U
0.265 B
0.0511 U
0.630
0.211 U
Phenanthrene
Mg/L
0.00500 U
0.00500 U
0.00500 U
0.00500 U
0.00500 U
0.00556 U
0.137
0.105 U
Pyrene
Mg/L
0.0170 U
0.0170 U
0.0170 U
0.0170 U
0.0318 J
0.0189 U
0.0397 J
0.105 U
2015-02-02 Dubuque-PNG Groundwater (10-14)
Silty Sand Aquifer Wells (3)
2/2/2015
35 of
-------
GROUNDWATER ANALYTICAL RESULTS
MIDAMERICAN ENERGY COMPANY
PEOPLES NATURAL GAS SITE
DUBUQUE, IOWA
Sample Location:
W-113
W-113
W-113
W-117
W-117
W-117
W-117
W-117
Screened Unit:
Silty Sand
Silty Sand
Silty Sand
Silty Sand
Silty Sand
Silty Sand
Silty Sand
Silty Sand
Depth BTOC (feet):
34.8
34.8
34.8
35.0
35.0
35.0
35.0
35.0
Sample Date:
04-Sep-13
29-Mar-14
21-Oct-14
26-May-94
26-May-94
29-Feb-96
24-Sep-96
26-Nov-96
Cleanup
Analyte
Units
Level
Benzene
M9/L
5
0.500 U
0.500 U
0.500 U
5.7
5.2
11
1.2
8.6 .
Toluene
pg/L
1,000
1.00 U
1.00 U.
1.00 U
1.4
1..1
2
2.8
1.9
Ethylbenzene
- mq/l
700
1.02
1.00 Li
1.00 U
1.0 U
10 U
3.8
1.7
1 U.
Xylenes
mq/l
10,000
3.00 U
3.00 U
3.00 U
21
1.0 U
na
4.1
na ..
2-Methy|naphthalene .
pg/L
—
na
na
0.105 U
10 U
10U
2
3
2
Dibenzofuran
pg/L
na
na
na
10 U
10 U
2
2
2
Acenaphthene
pg/L
—
0.0227 U
0.225 U
0.105 U
1
1
4
5 .
5
Acenaphthylene
pg/L
--
0.0897 U
0.449 U
0.105 U
0.8
0.8
10 U
10 U
1
Anthracene
pg/L
—
0.0103 U
0.112 U
0.1.05 U
10 U
10 U
10 U
10 U
10 U
Benzo(a)anthracene
pg/L
0.1'
0.0206 U
0.112 U
0.0526 U
10 U
10 U
-10 U
10.U
10 U
Benzo(a)pyrene
pg/L
0.2
0.00825 U
0.112 U
0.105 U
10 U
10 U
10 U
10 U
10 u
Benzo(b)fluoranthene
pg/L
0.1
0.0289 U •
0.112 U
0.0526 U
10 U
10 U
10 U
10 U
10 u
Benzo(g,h,i)perylene
pg/L
~
0.00825 U
0.225 U
0.105 UJ
10 U
10 U
10 U
1
10 U .
Benzo(k)fluoranthene
|jg/L
0.29
0.00722 U
0.112 U
0.105 U
10 u
10 u
10 u
10 u
10U
Chrysene
pg/L
2.9
0.00825 U
0.112 U
0.105 U
10 u
10 u
10 u
10U
10U
Dibenzo(a,h)anthracene
pg/L
0.013'
0.0103 U
0.112 U
0.0179 J
10 u
10 u
10 u
1
10 u
Fluoranthene
pg/L
_ . --
0.0103 U
0.112 U
0.105 U>
10 u
10 u .
10U
10 u
10U
Fluorene
pg/L
• 0.0165 U
0.112 U
0.105 U
10 u
10 u
10 u
10 u
1
lndeno(1,2,3cd)pyrene
pg/i-
.0-1
0.00619 U
0-112 U
0.0526 UJ
10 U
10 u .
10 u
1.
10 u
Naphthalene
pg/L
0.14
0.0474 U
0.225 U
0.0526 UJ
9
8
.28
28
22
Phenanthrene
pg/L
—
0.00515 U
0.112 U
0.105 U
10 U
10 U.
10 U
10 U
10 u
Pyrene
pg/i-
0.0175 U
0.112 U
¦ 0.105 U
10 u
10 U
10 u
10U
10U
2015-02-02 Dubuque-PNG Groundwater (10-14)
Silty Sand Aquifer Wells (3)
2/2/2015 36 of 77 •
n EZ3 EZ3 C~2 G3 CZ3 CZ3 C_3 E—J
-------
CZD
dm
GROUNDWATER ANALYTICAL RESULTS
MIDAMERICAN ENERGY COMPANY
PEOPLES NATURAL GAS SITE
DUBUQUE, IOWA
Sample Location: W-117 W-117 W-117 W-117 W-117 W-117 W-117 W-117 W-117
Screened Unit: Silty Sand Silty Sand Silty Sand Silty Sand Silty Sand Silty Sand Silty Sand Silty Sand Silty Sand
Depth BTOC (feet): 35.0 35.0 35.0 35.0 35.0 35.0 35.0 35.0 35.0
Sample Date: 23-Jan-97 29-May-97 30-Sep-97 17-Dec-97 17-Mar-98 16-Jun-98 29-Sep-98 10-Dec-98 24-Mar-99
Cleanup
Analyte Units Level
Benzene
yg/L
.5
8.9
7.5
11
9.7
9.5
13
14
12
10
Toluene
Mg/L
1,000
2.2
1.9
2.5
2.2
2
2.9
4.2
2
1.2
Ethylbenzene
yg/L
700
1.3
1.2
1.8
1.7
1.6
1.9
3.1
2
1.4
Xylenes
pg/L
10,000
na
2.2
3.7
3.3
2.4
3.6
5.1
3
1.9
2-Methylnaphthalene
Mg/L
—
1
1
3
2
1
2
3
10 U
10 U
Dibenzofuran
pg/L
"
2
2
3
3
3
3
4
10 U
2
Acenaphthene
M.g/L
~
4
5
8
7
7
6
11
10 U
6
Acenaphthylene
pg/L
~
10 U
10 U
1
1
1
1
3
10 U
10 U
Anthracene
pg/L
—
10 U
10 U
10U
10 U
10 U
10 u
10 U
10 U
10 U
Benzo(a)anthracene
Mg/L
0.1
10 u
10 u
10 U
10 u
10 u
10 u
10 U
10 U
10 U
Benzo(a)pyrene
pg/L
0.2
10 u
10 u
10 U
10 u
10 u
10 u
10 U
10 U
10 U
Benzo(b)fluoranthene
MQ/L
0.1
10 u
10 u
10 u
10 u
10U
10 u
10 U
10 U
10 U
Benzo(g,h,i)perylene
[jg/L
"
10 u
10 u
10U
10 u
10 u
10U
10 U
10 U
10 U
Benzo(k)fluoranthene
Mg/L
0.29
10 u
10 u
10U
10U
10 u
10 u
10 u -
10 U
10 u
Chrysene
Mg/L
2.9
10 u
10 u
10 u
10 u
10U
10 u
10 u
10 U
10 u
Dibenzo(a,h)anthracene
pg/L
0.013
10 u
10 u
10 u
10 u
10 u
10 u
10 u
10 u
10 u
Fluoranthene
pg/L
—
10 u
. 10 u
10 u
10 u
10 u
10 u
10 u
10U
10 u
Fluorene
|jg/L •
—
1
.1
,2
2
1
2
2
10U
10U
lndeno(1,2,3cd)pyrene
Mg/L
.0.1
10 u
10 u
.10 u
10 u
10 u
10U .
10 U
10 u
10 u
Naphthalene
pg/L
¦0.14
18
21
38
26
21
29
48
37
20
Phenanthrene
pg/L
—
10 u
10 u
1
1
10 u
1
2
10 U'
10 u
Pyrene
pg/L
--
10 u
10U
10U
10 u
10 u
10 U
10 u
10 U
10 u
2015-02-02 Dubuque-PNG Groundwater (10-14)
Silty Sand Aquifer Wells (3)
2/2/2015
37 of 77
-------
GROUNDWATER ANALYTICAL RESULTS
MIDAMERICAN ENERGY COMPANY
PEOPLES NATURAL GAS SITE
DUBUQUE, IOWA
Sample Location:
W-117
W-117
W-117
W-117
W-117
W-117
W-117
W-117
Wr117
Screened Unit:
Silty Sand
Silty Sand
Silty Sand
Silty Sand
Silty Sand
Silty Sand
Silty Sand
Silty Sand
Silty Sand
Depth BTOC (feet):
35.0
35.0
35.0
35.0
35.0
35.0
35.0
35.0
35.0
'
Sample Date:
23-Jun-99
28-Sep-99
15-Dec-99
15-Mar-00
06-Jun-00
15-Sep-00
14-Dec-00
20-Mar-01
07-Jun-01
Cleanup
Analyte
Units
Level
Benzene
pg/L
5
8.5
8.8
12
3.6
10
9.8
12
11
1.6
Toluene
Mg/L
1,000
1.6
1.2
3.4
0.56
1 u
1.1 ¦
1.3
1
1 U
Ethylbenzene
Mg/L
700
2
1.6
15
0.72
1.7
1.7
1.8
1.7
1 U
Xylenes
Mg/L
10,000
2.6
2.4
12
1.4
2.3
2.4
3.1
2.5
1 U
2-Methylnaphthalene
MQ/L
—
2
10 U
10 U
10 U
10 U
10 U
10 U
10 U
10 U
Dibenzofuran
Mg/L
—
5
4
4
2
2
2 J
2 J
2.2 J
1.0 J
Acenaphthene
pg/L
--
12
8
9
4
7
6 J
6 J
1.9 J
2.4 J
Acenaphthylene
pg/L
--
10 U
10 U
10 U
10 U
2
2 J
2 J
2.2 J
10 U
Anthracene
pg/L
—
10 U
10 U
10 U
10 U
¦ 10 U
10 U
10 U
10 U
10 U
Benzo(a)anthracene
pg/L
0.1
10 U
10 U
10 U
10 U
10 u
10 U
10 U
10 U
10 U
Benzo(a)pyrene
Mg/L
0.2
10 U
10U
10 U
10 U
10 u
10 U
10 U
10 U
10 U
Benzo(b)fluoranthene
pg/L
0.1
10 U
10 U
10 U
10 U
10 u
10 U
10 U
10 U
10 U
Benzo(g-,h,i)perylene
pg/L
--
10 U
10 U
10 U
10 U
10 u
10 U
10 U
10 U
10 U
Benzo(k)fluoranthene
ms/l
0.29
10 u
10 u
10 U
10U
10 u
10 u
10 U
10U
10 U
Chrysene
pg/L
2.9
10 U
10 U •
10 U
10 U
10 u
10 u
10 U
10 U
10 U
Dibenzo(a,h)anthracene
pg/L
0.013
10 U
10 u
10 U
10 U
10 u
10 u
10 U
10 U
10 u
Fluoranthene
Mg/L
—
10 U
10 u
10 U
10 u
10 u
10 u
10 U
10 U
10 u
Fluorene
Mg/L
—
2
2
2
1
: 1
10 u
10 U
10 U
10.U
lndeno(1,2,3cd)pyrene
Mg/L
0.1
.10 u
10 u
10 U
10 u
10 u
10 u
10 U
10 U
10 u
Naphthalene
Mg/L
0.14
31
26
51
6 :
' 12
6 J
10J
0.98 J
10 u
Phenanthrene
Mg/L
—
2
10 U
2
10 U
0.9
10 u
10 U
10 U
10 u
Pyrene
Mg/L
—
10 U
10 U
10 u
10 U
10 u
10 u
10 U
10 U
10 u
2015-02-02 Dubuque-PNG Groundwater (10-14)
Silty Sand Aquifer Wells (3)
2/2/2015
38 of 77
-------
CZD CZj
GROUNDWATER ANALYTICAL RESULTS
MIDAMERICAN ENERGY COMPANY
PEOPLES NATURAL GAS SITE
DUBUQUE, IOWA
Sample Location:
W-117
W-117
W-117
W-117
W-117
W-117
W-117
W-117
W-117
Screened Unit:
Silty Sand
Silty Sand
Silty Sand
Silty Sand
Silty Sand
Silty Sand
Silty Sand
Silty Sand
Silty Sam
Depth BTOC (feet):
35.0
35.0
35.0
35.0
35.0
35.0
35.0
35.0
35.0
Sample Date:
20-Sep-01
12-Dec-01
14-Mar-02
07-Jun-02
18-Sep-02
05-Dec-02
09-Jun-03
30-Mar-04
15-Sep-0'
Cleanup
Analyte
Units
Level
Benzene
pg/L
5
17
16
1 U
11
13
2.6
9.9
1.7 H
8.7
Toluene
Mg/L
1,000
5.8
4.2
2.7
3
2
0.77 J
; 2 U
1.0 U
3.2
Ethylbenzene
Mg/L
700
3.9
4
5.6
3.1
3.7
0.74 J
2 U
1.0 U
2.8
Xylenes
Mg/i-
10,000
6.8
5.2
7.6
4.3
4.5
1.2
7 u
1.0U
4.1 .
2-Methylnaphthalene
pg/L
—
10 U
10 U
10 U
10 U
10 U
10 U
na
na
na
Dibenzofuran
pg/L
—
3.7 J
5 J
10 U
5.7 J
10
1.1J
na
na
na
Acenaphthene
Mg/L
--
13
16
10 U
19
30
2.8J
11
3.7
1.5 Ja
Acenaphthylene
pg/L
-
10 U
1.9 J
10 U
10 U
2.5 J
1.7J
0.92
4.1
4
Anthracene
pg/L
—
10 U
10 U
10 U
10 U
10 U
10 U
0.22
0.036 Ja
0.022 Ja
Benzo(a)anthracene
pg/L
0.1
10 U
10 U
10 U
10 U
10 U
10 U
0.17
0.034 Ja
0.13 U
Benzo(a)pyrene
Mg/L
0.2
10 U,
10 U
10 U
10 U
10 U
10 U
0.12
0.057 Ja
0.13 U
Benzo(b)fluoranthene
pg/L
0.1
10 U
10 U
10 U
10 U
10 U
10 U
0.1 U
0.040 Ja
0.050 U
Benzo(g,h,i)perylene
pg/L
--
10 U
10 U
10 U
10 U
10 U
10 U
0.1 U
0.2 U
0.20 U
Benzo(k)fluorarithene
pg/i-
0.29
10 U.
10 U
10U
10 U
10 U
10 U
0.12
.0.020 Ja
0.050 U
Chrysene
Mg/L
2.9
10 U
10 u
10 U
10 U
10 U
10 U
0.12
0.13 U
0.13 U
Dibenzo(a,h)anthracene
pg/L
0.013 ¦
10 U
10 u
10 U
10 U
10 U
10 U
0.1 U
0.30 U
0.30 U
Fluoranthene
pg/L
—
10 U
10 u
10 U
10 U
10U
. 10 U
0.26
0.090 Ja
0,13 U
Fluorene
pg/L
—
1.6 J
2.3 J
10 u
2.5 J
4.6 J
10 U
1.4
0.31
0.13 Ja
lndeno(1,2,3cd)pyrene
pg/L
0.1
10 U
: 1 0 U
10 u
10 U
10U .
10 U
0.1 U
0.13 U
0.13 U
Naphthalene
pg/L
0.14
57
33
1.2 J
27
32
6
3.9
7.1
7
Phenanthrene
Mg/L
—
10 U
0.61 J
10 U
0.67 J
1.8 J
10 U
0.48
0.035 Ja
0.10 U
Pyrene
|jg/L
--
. 10 U
10-u:
10 U
10 U
10 U
10 U
0.21
0.25 U
0.25 U
2015-02-02 Dubuque-PNG Groundwater (10-14)
Silty Sand Aquifer Wells (3)
2/2/2015
39 of 77
-------
GROUNDWATER ANALYTICAL RESULTS
MIDAMERICAN ENERGY COMPANY
PEOPLES NATURAL GAS SITE
DUBUQUE, IOWA
Sample Location:
W-117
W-117
W-117R
W-117R
W-117R
W-117R
W-117R
W-117R
W-117R
Screened Unit:
Silty Sand
Silty Sand
Silty Sand
Silty Sand
Silty Sand
Silty Sand
Silty Sand
Silty Sand
Silty Sand
Depth BTOC (feet):
35.0
35.0
35.7
35.7
35.7
35.7
35.7
35.7
35.7
Sample Date:
14-Mar-05
27-Apr-05
11 -Oct-05
15-Mar-06
12-Sep-06
18-Apr-07
20-Sep-07
0.6-May-08
01 -Oct-08
Cleanup
Analyte
Units
Level
Benzene
pg/L
5
0.79
1:1
2.7
35
24.8
16.6
39.8
15.8
8.08
Toluene
mq/l
1,000
1.0 U
1.0 u
1.0 U
3.1
9
2.55
9.32
1.26
1.0 U
Ethylbenzene
pg/L
700
1.0 U
1.0 u
1.8
3.2
5.72
2.56
8.3
5.91
3.42
Xylenes
pg/L
10,000
1.0 U
1.0 u
1.0 U
3.4
10.2
4.36
14.2
6.6
"6.09
2-Methylnaphthalene
pg/L
—
na
na
na
na
na
na
na
na
na
Dibenzofuran
pg/L
—
na
na
na
na
na
na
na
na
na
Acenaphthene
Mg/L
~
1.2
1.0 Ja
12 Ja
2.4 U
3.04
3.93
4.49
3.41
4.33
Acenaphthylene
pg/L
. -
3.8
2.3
15
15
4.95
7.51
11.5
6.44
16.3
Anthracene
pg/L
—
0.027
0.050 Ua
0.029 Ja
0.049 Ua
0.0407 J
0.0495 J
0.075 J
0.027 J
0.0100 U
Benzo(a)anthracene
pg/L
0.1
0.12 U
0.13 U
0.018 Ja
0.13 U
0.00341 U
0.00337 U
0.00300 U
0.00300 U
0.00500 U
Benzo(a)pyrene
pg/L
0.2
0.12 U
0.13 U
0.025 Ja
0.13 U
0.0148 U
0.0360 U
0.0320 U
0.0320 U
0.00800 U
Benzo(b)fluoranthene
pg/L
0.1
0.048 U
0.050 U
0.025 Ja
0.049 Ua
0.0170 U
0.0146 U
0.0130 U
0.0130 U
0.0280 U
Benzo(g,h,i)perylene
pg/L
—
0.19 U
0.2 U
0.19 U
0.19 U
0.0364 U
0.0101 U
0.00900 U
0.00900 U
0.00800 U
Benzo(k)fluoranthene
pg/L
0.29
0.048 U
0.050 U
0.047 U
0.049 U
0.0102 U
0.0169 U
0.0150 U
0.0150 U
0.00700 U
Chrysene
pg/L
2.9
0.12 U
0.13 U
0.046 Ja
0.13 U
0.00568 U
0.00562 U
0.00500 U
0.00500 U
0.00800 U
Dibenzo(a,h)anthracene
pg/L
0.013
0.29 U
0.30 U
0.28 U
0.29 U*
0.0114 U
0.0112 U
0.0100 U
0.0100 U
0.0100 U
Fluoranthene
pg/L
—
0.12 U
0.13 U
0.068 Ja
0.13 U
0.0114 U
0.0112 U,
0.0100 U
0:0100 U
0.0100 U
Fluorene
pg/L
—
0.083
0.079 Ja
1.2
1.1
1.52
2:23
2.82
1.7
3.06
lndeno(1,2,3cd)pyrene
pg/L
¦J0--1 --
0.12 U
0.13 U
0.12 U
0.13 U
0.00795 U
0.00787 U
0.00700 U
0.00700 U
0.00600 U
Naphthalene
pg/L
0.14
1.2 U
0.51 Ja
1.2 U
.1.3 U
2.47
4.18 B
6.12
2.4
6.68
Phenanthrene
pg/L
~
0.096 U
0.052 Ja
0.12
0.11
0.13
0.152
0.296
0.204
0.308
Pyrene
pg/L
~
0.24 U
0.25 U
0.23 U
0.24 U
0.0216 U
0.0213 U
0.0190 U
0.0.190 U
0.0170 U
2015-02-02 Dubuque-PNG Groundwater (10-14)
Silty Sand Aquifer Wells (3)
2/2/2015
40 of 77
EH3 £=3 C3J C3 C3 C-J
L-3
-------
GROUNDWATER ANALYTICAL RESULTS
MIDAMERICAN ENERGY COMPANY
PEOPLES NATURAL GAS SITE
DUBUQUE, IOWA
Sample Location:
W-117R
W-117R
W-117R
W-i17R
W-117R
W-117R
W-117R
W-117R
Screened Unit:
Silty Sand
Silty Sand
Silty Sand
Silty Sand
Silty Sand
Silty Sand
Silty Sand
Silty Sand
Depth BTOC (feet):
35.7
35.7
35.7
35.7
35.7
35.7
35.7
35.7
Sample Date:
29-Apr-09
16-Sep-09
31-Mar-iO
06-May-10
16-Sep-10
28-Apr-11
20-Sep-11
25-Apr-12
Cleanup
Arialyte
Units
Level
Benzene
mq/l
5
3.43
43 FM
27.1
na
31.5
1.00 u
1.88
2.13
Toluene
M9/L
1,000
1.00 U
5.1 FM
1.00 U ¦
na
1.6
1.00 u
1.00 U
1.00 U
Ethylbenzene
Mg/i^
700
6.28
8.1 FM
4.91
na
11.1
2.72
1.00. U
2.03
Xylenes
Mg/L
10,000
3.00 U
15.0 U FM
6.00 U
na
9.97
12.6
3:00 U
3.47
2-Methylnaphthalene
mq/l
—
na
na
na
na.
na
na
na
0.335
Dibenzofuran
pg/L
--
na
na
na
na
na
na
na
na
Acenaphthene.
pg/L
~
2.93
0.135 J
5.29
3.6
0.164 J
4.89 RL1
3.04
1.7
Acenaphthylene
pg/L
-
9.31
0.0870 U
13.6
16.1
0.0870 U
10.5 RL1
9.46
4.55
Anthracene
Mg/L
— '
0.0419 J
0.0276 J
0.0100 U
0.0100 U
0.0100 U
0.108 RL1,J
0.0602 J
0.0312 J
Benzo(a)anthracene
Mg/L
0.1
0.00500 U
0.0506 J
0.00500 U
0.00500 U
0.00500 U
D.0400 U,RL"
0.0200 U
0.0200 U
Benzo(a)pyrene
Mg/L
0.2
0.00800 U
0.0866 J
0.00800 U
0.00800 U
0.00800. U
D.0160 U,RL'
0.00800 U
0.00800 U
Benzo(b)fluoranthene
pg/L
0.1
0.0280 U
0.0938 J
0.0280 U
0.0280 U
0.0280 U
D.0560 U,RL'
0.0280 U
0.0280 U
Benzo(g,h,i)perylene
Mg/L
0.00800 U
0.085 J
0.00800 U
0.00800 U
0.00800 U
3.0160 U,RL'
0.00800 U
0.00800 U
Benzo(k)fluoranthene -
ijg/L
- 0.29
0.00700 U
0.0586 J
0.00700 U
-0.00700 U
•0.00700 U
3.0140 U,RL'
0.00700 U
0.00700 U
Chrysene
[jg/L
2.9
0.00800 U
0.0745 J
0.00800 U
0.00800 U
0.00800 U
0.0204 RL1,i
0.00800 U
0.00800 U
Dibenzo(a,h)anthracene
|jg/i-
0.013
0.0100 U
0.0100 U
0.0100 U
0.0100 U
0.0100 U
D.0200 U,RL"
0.0100 U
0.0100 U
Fluoranthene
Mg/L
—
0.0100 U
0.0732 J
0,0100 U
0.0100 U
0.0100 U
0:0318 RL1,.
0.0100 U
-0,0.100 U
Fluorene
Mg/L
—
1.76
0.0579 J
1.52
1.61
0.0.160 U
D.0320 U,RL
1.43
0.773
lndeno(1,2,3cd)pyrene
[jg/L
0.1
0.00600 U
0.0771 J .
0.00600 U
0.00600 U
0.00600, U
D.0.120 U,RL'
0,00600 U.
0.00600 U
Naphthalene
pg/i
. 0.14,.
0.528
0.151
R
15
0.0460 1)
0.831 RL1
0.0460 U
0.0631 J
Phenanthrene
pg/L
—
0.188'
0.0784 J
0.00500 U
0.155
0.00500 U
0.0867 RL1,.
0.178:
0.0917 J
Pyrene
pg/f-
~
0.0170 U
0.107 J
0.0170 U
0.0170 U
0.0335 J
D.0340 U,RL'
0.0170 U
0.0170 U
2015-02-02 Dubuque-PNG Groundwater (10-14)
Silty Sand Aquifer Wells (3)
2/2/2015
41 of 77
-------
GROUNDWATER ANALYTICAL RESULTS
MIDAMERICAN ENERGY COMPANY
PEOPLES NATURAL GAS SITE
DUBUQUE, IOWA
Sample Location:
W-117R
W-117R
W-117R
W-117R
W-117R
W-118
W-118
W-118
Screened Unit:
Silty Sand
Silty Sand
Silty Sand
Silty Sand
Silty Sand
Silty Sand
Silty Sand
Silty Sand
Depth BTOC (feet):
35.7
35.7
35.7
35.7
35.7
28.5.
28-5
28.5
Sample Date:
25-Sep-12
01-May-13
05-Sep-13
26-Mar-14
22-Oct-14
25-Sep-96
26-Nov-96
22-Jan-97
Cleanup
.
Analyte
Units
Level
Benzene
mq/l
5
65.2
6.54
2.54
7.68
0.930
1200
960
250
Toluene
mq/l
1,000
1.00 U
1.34
1.00 U
1.00 U
1.00 U
40
21
10 U
Ethylbenzene
pg/L
700
1..00 U
1.25
1.00 U
1.00 U
1.00 U
40U.
1100
360
Xylenes
Mg/L
10,000
3:00 U
3.00 U
3.00 U
3.00 U.
3.00 U
600
na
na
2-Methylnaphthalene
pg/L
0.425
ha
na
na
0.100 U
200 U
400 U
10 U
Dibenzofuran
pg/L
—
na
na
na
na
na
200 U
400 U
3
Acenaphthene
pg/L
--
3.57
7.55
8.94
9.44
11.1
26
400 U
17
Acenaphthylene
pg/L
5.15
9.73
18.4
7.1 ¦
4.41
32
40
23
Anthracene
pg/L
—
0.0710 J
0.119
0.123
0.102 U
0.100 U
200 U
400 U
10U
Benzo(a)anthracene
Mg/L
0.1
0.0200 U
0.104 U
0.0204 U
0.102 U
0.100 U
200 U
400 U
10 u
Benzo(a)pyrene
Mg/L
0.2
0.00800 U
0.104 U
0.00816 U.
0.102 U
0.100 U
200 U
400 U -
10 u
Benzo(b)fluoranthene
pg/L
0.1
0.0280 U
0.104 U
0.0286 U
0.102 U
. 0.100 U
200 U
400 U
10 u
Benzo(g,h,i)perylene
Mg/L
--
0.00800 U
0.208 U
0.00816 U
0.204 U
0.100 U
200 U
400 U
10 u
Benzo(k)fluoranthene
pg/L
0.29
0.00700 U
0.104 U
0.00714 U
0.102 U
0.100 U
200 U
400 U
10 u
Chrysene •
mq/l
2:9
0.00800 U
0.104 U
0.00816 U
0.102 U
0.100 u
. 200 U
400 U
10 u
Dibenzo(a,h)anthracene
Mg/L
0.013
0.0100 U
0.104 U
0.0102 U
0.1.02 U
0.0170 U
200 U
400 U
10 u
Fluoranthene
Mg/L
—
0.0100 U
0.104 U
0.0102 U
0:355
0.100 u
200 U
400 U
10 u
Fluorene
Mg/L
„ —
0.723
1.09
0.838
0.749
0.282
200 U
400 U
6
lndeno(1,2,3cd)pyrene
Mg/L
0.1
0.00600 U
0:104 U
0.00612 U
0.102 U
0,100 U
200 U
400 U
10 u
Naphthalene
Mg/L
0.14
0^632
19.9
0.0469 U
1.73
0.145
1400
1400
340
Phenanthrene
Mg/L
—
0.0837 J
0.104 U
0.222
0.324
0.100 U
200 U
400 U
3
Pyrene
Mg/L
—
0.0171 J
0.104 U
0.0173 U
0.25
0.100 U
- 200 U
400 U
10 U
2015-02-02 Dubuque-PNG Groundwater (10-14)
Silty Sand Aquifer Wells'(3)
2/2/2015
42.of 77
czj c=~r
EZ3 CZ3 C—i
L 1
i 1
-------
EZ* CZj tZw UZ3 Z
GROUNDWATER ANALYTICAL RESULTS
MIDAMERICAN ENERGY COMPANY
PEOPLES NATURAL GAS SITE
DUBUQUE, IOWA
Sample Location:
W-118
W-118
W-118
W-118
W-118
W-118
W-118
W-118
W-118
Screened Unit:
Silty Sand
Silty Sand
Silty Sand
Silty Sand
Silty Sand
Silty Sand
Silty Sand
Silty Sand
Silty Sand
Depth BTOC (feet):
28.5
28.5
28.5
28.5
28.5
28.5
28.5
28.5
28.5
Sample Date:
29-May-97
25-Sep-97
18-Dec-97
17-Mar-98
16-Jun-98
29-Sep-98
10-Dec-98
23-Mar-99
23-Jun-99
Cleanup
Analyte
Units
Level
Benzene
Mg/i-
5
1 U
120
44
27
22
18
10
13
3.2
Toluene
mq/l
1,000
1 U
9.8
2.5U
1 U
2.1
3
1
0.58
0.29
Ethylbenzene
Mg/L
700
1 u
400
93
45.
66
23
8
2.9
3.2
Xylenes
Mg/L
10,000
1 u
156
3.4
1 U
7.9
5.9
2
1 U
0.73
2-Methylnaphthalene
Mg/L
—
20 U
10 U
10 U
10 U
10 U
10 U
10 U
10U
10 U
Dibenzofuran
pg/L
4
3
1
1
'1
10 U
10U
10 U
10 U
Acenaphthene
Mg/L
--
10 U
28
12
9
11
7
10 U
3.
6
Acenaphthylene
Mg/L
¦ ¦
20 U
22
8
6
7
4 .
10 U
2
3
Anthracene
Mg/L
—
20 U
10 U
10 U
10U
10U
10 U
10 U
10 u
10U
Benzo(a)anthracene
Mg/L
o!i
20 U
10 u
10 U
10 U
10 U
10 U
10 U
10 u
10 U
Benzo(a)pyrene
Mg/L
0.2
20 U
10 u
10 U
10 U
10 U
10 U
10 U
10U
10 U
Benzo(b)fluoranthene
Mg/L
0.1
20 U
10 u
10 U
10 U
10 U
10 U
10 u
10 u
10 U
Benzo(g,h,i)perylene
Mg/L
"
20 U
10'U
10 U
10 U
10U
. 10 U
10 u
10 u
I'D U
Benzo(k)fluoranthene
Mg/L
0.29
20 U
10 u
10 U
10U
10 U
• 10 U
10 u
10 u
10U
Chrysene
Mg/L
2.9
20 U
10 u
10 U
10 U
10 u
10 U
10 u
10U
10U
Dibenzo(a,h)anthracene
Mg/L
0.013
20 U
10 u
10 U
10 U
. 10 u
10 U
10 u
10 u
10 u
Fluoranthene
pg/L
¦ —
20 U
10,u
10 U
. 10 U
10 u
10 U ,
10 u .
10.u
.10 u
Fluorene
Mg/L
. —
20 U
8
3
10 u
3
2
10 u
10 u:
2
lndeno(1,2,3cd)pyrene
Mg/L
0.1
20 U
10 u
. 10 U-.
10 u
10 U .
10 U
10 u
10 u
, ,10 u
Naphthalene
Mg/L
0.14
120
270
3
10 u
4
5
.10 u
10 u
-io u
Phenanthrene
Mg/L
—
5
5
3
2
2
1
10 u
10 u
. 10 u
Pyrene
Mg/L
—
20 U
10U
10 u.
10 U
10 U
10 U
10U
10U
10 u
2015-02-02 Dubuque-PNG Groundwater (10-14)
Silty Sand Aquifer Wells (3)
2/2/2015
43 of 77
-------
GROUNDWATER ANALYTICAL RESULTS
MIDAMERICAN ENERGY COMPANY
PEOPLES NATURAL GAS SITE
DUBUQUE, IOWA
Sample Location:
W-118
W-118
W-118
W-118
W-118
W-118
W-118
W-118
W-118
Screened Unit:
Silty Sand
Silty Sand
Silty Sand
Silty Sand
Silty Sand
Silty Sand
Silty Sand
Silty Sand
Silty Sand
Depth BTOC (feet):
28.5
28.5
28.5
28.5
28.5
28.5
28.5
28.5
28.5
Sample Date:
28-Sep-99
15-Dec-99
15-Mar-00
06-Jun-00
14-Sep-00
14-Dec-OO
21-Mar-01
07-Jun-01
20-Sep-01
Cleanup
Analyte
Units
Level
'
Benzene
MQ/L
5
3.6
71
6.1
20
35
16
10
79
43
Toluene
mq/l
1,000
0.72
14
1
1.5
3:1
1.2
0.71 J
2 U
1.5
Ethylbenzene
pg/L
700
5.8
50
1.9
42
87
10
1.8
54
2.7
Xylenes
pg/i
10,000
1.8
30
2.7
10
25
6
2.6
18
7.9
2-Methylnaphthalene
pg/L
—
10 U
10 U
10 U
11 U
10 U
10 U
11 U
10 U
10U
Dibenzofuran
pg/L
—
10 U
10 U
10 U
11 U
10 u
10 U
11 U
0.62 J
10 U
Acenaphthene
pg/L
~
5
8
7
5
9 J
11
6.2 J
17
8.7 J
Acenaphthylene
pg/L
--
3
6
2
2
3 J
4 J
4.3 J
7.1 J
3.1 J
Anthracene
pg/L
10 U
10 U
10 U
11 U
10 U
10 U
11 U
10 U
10 U
Benzo(a)anthracene
pg/L
0.1
10 U
10 U
10 u
11 U
10 U
10 U
11 U
10 U
10 U
Benzo(a)pyrene
pg/L
0.2
10 U
10 U
10 u
11 U
10 U
10 U
11 U
10 U
10 U
Benzo(b)fluoranthene
pg/L
0.1
10 U
10 U
10 u
11 U
10 U
10 U
11 U
10 U
10 U
Benzo(g,h,i)perylene
pg/L
~
10 U
10 U
10 u
11 U
10 U
10 U
11 U
10 U
10 U
Benzo(k)fluoranthene
pg/L
0.29
10 U
10U
10 u
11 U
10 U
10 U
11 U
10 U
10U
Ghrysene
pg/L
2.9
10 U
10 U
10 u
11 U
10 U
10 U
11 U
10U
10 U
Dibenzo(a,h)anthracene
pg/L
0.013
10 U
10 U
10 u
11 U.
10 u
10 U
11 U
10 U
10 U
Fluoranthene .
' pg/L
. —
10 U
10 U
10 u
11 u
10 u
1.0 U
11 U
10 U
10 U
Fluorene
pg/L
2
2
.2
1
2 J
2 J
2:5 J
3.1 J
1.4 J
lndeno(1,2,3cd)pyrene
pg/L
0.1
10 u
10U
10 u
11 u
10 U
10 U
11 U
10 U
10U
Naphthalene
pg/L
0.14
. 3
62
2
3
14 J
4 J
11 u
.30
1.4 J
Phenanthrene
pg/L
~
10 U
'10 U
10 u
11 U
10 U
10 U
1.5 J
1.8 J
10 U
Pyrene
pg/L
--
10 U
10 U
10 u
11 U
10 U
10 U
11 U
10.U
10 U
2015-02-02 Dubuque-PNG Groundwater (1CM4)
Silty Sand Aquifer Wells (3)
2/2/2015 ' 44 of 77
cm? dj cza c~} nm) cm -L—: u-2 l_j -—i ;—? :—' L—J :——>
-------
CZ2 C=3 CZ3 ST3 8=12 CH CZ3 f^_J ¦ C__3 £_3 '¦
GROUNDWATER ANALYTICAL RESULTS
MIDAMERICAN ENERGY COMPANY
PEOPLES NATURAL GAS SITE
DUBUQUE, IOWA
Sample Location:
W-118
W-118
W-118
W-118
W-118
W-118
W-118
W-118
W-118
Screened Unit:
Silty Sand
Silty Sand
Silty Sand
Silty Sand
Silty Sand
Silty Sand
Silty Sand
Silty Sand
Silty Sand
Depth BTOC (feet):
28.5
28.5
28.5
28.5
28.5
28.5
28.5
28.5
28.5
Sample Date:
12-Dec-01
14-Mar-02
04-Jun-02
18-Sep-02
04-Dec-02
09-Jun-03
30-Mar-04
14-Sep-04
15-Mar-05
Cleanup
Analyte
Units
Level
Benzene
Pg/L
5-
¦100
240
130
260
350
61
220 M
170
89
Toluene.
Pg/L
1,000
1.8 .
4.1 J
25 U
2.4
2
2 U
1.6
1.9
¦1.9
Ethylbenzene
pg/L
700
0.92 J
25 U
25 U
1 U
2.3
2 U
4.4
6.8.
5.8
Xylenes
M9/L
10,000
4.4
25 U
25 U
4
3.3
7 U
12
15
13
2-Methylnaphthalene
pg/L
—
10 U
10U
10 U
10 u
10 U
na
na
na
na
Dibenzofuran
pg/L
—
10 U
10 U
10 U
0.44 J
0.50 J
na
na
na
na
Acenaphthene
pg/L
—
17
13
5.5 J
12
17
8.2
12
2.7.Ua
2.6 U
Acenaphthylene
pg/L
—
4.9 J
.3.5 J
1.6 J
2.8 J
4.1 J
1.1
6.5 U
15
17
Anthracene
pg/L
10 U
10 U
10 U
10 U
10 U
0.1 U
0.045 Ja
0.055 U
0.051 U
Benzo(a)anthracene
|jg/L
0.1
10 U
10U
10 U
10 U
10 U
0.1 u
0.13 U
0.14 U
0.13 U
Benzo(a)pyrene
pg/L
0.2
.10 U
10 u
10 U
10 U
10U
0.1 u
0.13 U
0.14 U
0.13 U
Benzo(b)fluoranthene
pg/L
0.1
10 U
10 U
10 U
10U
10 U
0/1 u
0.050 U
0.05.5 U
0.051 U
Benzo(g,h,i)perylene
pg/L
--
10 U
10 U
10 U
10 U
10 U
0.1 u
0.20 U
0.22 U
0.20 U
Benzo(k)fluoranthene
0.29
10 U
10-U
10 U
10 U
10U
0.1 u
0.050 U
0.055 U
0.051 U
Chrysene
pg/L
2.9
10 U
10U
10U
10 U
10U
0.1 u
0.13 U
0.14 U
0.13 U
Dibenzo(a,h)anthracene
pg/L
0.013
10U
10 U
10 U
10 u
10 u
0.1 u
0.30 U
0.33 U
0.31 U
Fluoranthene
pg/L
—
10 U
10 U
10U
.10 u
10 u
0.1 u.
0.068 Ja
0,14 U
0.13 U .
Fluorene
. pg/L
—
3.7 J
2.3 J
0.98 J
1.9 J
2.8 J
.1.2
1.5
0.14 Ja
0.14
lndeno(1,2,3cd)pyrene
pg/L
0.1 ..
10 U
10 U
10 U
10 U
.10 U.
0.1 u.
0.13 U
. 0.14 U
0.13 U
Naphthalene
pg/L
: 0.14
.1.1 J
10 U
6,1 J
10 U
'1.3
0.56
25 ,,
' .110/
11.0
Phenanthrene
pg/L
1.6 J
10 U
10U
10 U
0.70 J
0.24
0.12
0.069 Ja
0.053
Pyrene
pg/L
—
10 CJ
10 u
10U
10 u
10U
0.1 U -
0.25 U
0.27 U
0.26'U
2015-02-02 Dubuque-PNG Groundwater (10-14)
Silty Sand Aquifer Wells (3)
2/2/2015
45 of 77
-------
GROUNDWATER ANALYTICAL RESULTS
MIDAMERICAN ENERGY COMPANY
PEOPLES NATURAL GAS SITE
DUBUQUE, IOWA
Sample Location:
W-118R
W-118R
W-118R
W-118R
W-118R
W-118R
W-118R
W-118R
W-118R
Screened Unit:
Silty Sand
Silty Sand
Silty Sand
Silty Sand
Silty Sand
Silty Sand
Silty Sand
Silty Sand
Silty Sand
Depth BTOC (feet):
29.0
29.0
29.0
29.0
29.0
29.0
29.0
29.0
29.0
Sample Date:
02-May-05
10-0ct-05
14-Mar-06
11-Sep-06
17-Apr-07
19-Sep-07
05-May-08
00
o
1
Q.
0)
CO
1
©
CO
28-Apr-09
Cleanup
Analyte
Units
Level
Benzene
MQ/L
5
170
190
120
71.3
72. 7 M1
21.7
97.5
165
137
Toluene
Mg/L
1,000
0.82 Ja
1.0 U
1.0 U
1.00 U
1.00 U
1.00 U
1.00 U
1.00 U
1.00 U
Ethylbenzene
Mg/L.
700
0.95 J
1.2
1.0 U
1.00 U
1.00 U
1.00 U
1.00 U
1.00 U
4.96
Xylenes
Mg/L
10,000
1.5
3.2
1.0 U
3.00 U
3.00 U
3.00 U
3.00 U
3.00 U
3.00 U
2-Methylnaphthalene
Mg/L
—
na
na
na
na
na
na
na
na
na
Dibenzofuran
pg/L
~ .
na
na
na
na
na
na
na
na
na
Acenaphthene
Mg/L
—
9.8
9.7
4.5
2.9
3.43
4.18
9.45
10.6
3.78
Acenaphthylene
Mg/L
--
68
56
19
3.34
3.56
5.46
10.4
15.6
7.75
Anthracene
Mg/L
0.035 Ja
0.055 U
0.049 U
0.0100 U
0.0100 U
0.0100 U
0.0262 J
0.0417 J
0.0155 J
Benzo(a)anthracene
pg/L
0.1
0.12 U
0.14 U
0.13 U
0:00300 U
0.00300 U
0.00300 U
0.00300 U
0.00500 U
0.00500 U
Benzo(a)pyrene .
Mg/L
0.2
0.12 U
0.14 U
0.13 U
0.0320 U
0.0320 U
0:0320 U
0.0320 U
0.00800 U
0.00800 U
Benzo(b)fluoranthene
Mg/L
°-1
0.047 Ua
0.055 U
0.049 U
0.0130 U
0.0130 U
0.0130 U
0.0130 U
0.0280 U
0.0280 U
Benzo(g,h,i)perylene
|jg/L
—
0.19 U
0.22 U
0.20 U
0.00900 U
0.00900 U
0.00900 U
0.00900 U.
0.00800 U
0.00800 U
Benzo(k)fluoranthene
Mg/L
0.29
0.047 U
0.055 U
0.049 U
0.0150 U
0.0150 U
0.0150 U
0.0150 U
0.00700 U
0.00700 U
Chrysene
Mg/L
2.9
0.12 U
0.14 U
0.13 U
0.00500 U
0.00500 U
0.00500 U
0.00500 U
0.00800 U
0.00800 U
Dibenzo(a,h)anthracene
mq/l
0.013
0.28 U
0.33 U
0.29 U*
0.0100 U
0.0100 U
0.0100 U
0.0100 U
0.0100 U
0.0100 U
Fluoranthene
Mg/L
—
0.069 Ja
0.14 U
0.13 U
0.0.100 U
0.0100 U
0.0100 U
0.0100 U
0.0495 J
0.0100 U
Fluorene
Mg/L
•
0.65
0.58
0.19 Ja
0.998
0.755
1.35
3.03
3.44
1.41
lndeno(1,2,3cd)pyrene
Mg/L
0:1
0,12 U
0.14 U
0.13 U
0.00700 U
0.00700 U
0.00700 U
0.00700 U
0.00600 U
0.00600 U
Naphthalene
Mg/L
0.14
1.2 J
1.4 U
.1.3 U
0.193
0.398
0.21
1.07
. 0.805
0.0460 U
Phenanthrene
Mg/L
—
0.28
0.19
0.064 Ja
0^0988 J
0.0824 J
0.13
0.153
0.199
0.0856 J
Pyrene
Mg/L
"
0.051 Ja
0.27 U
0.25 U
0.0190 U
0.01.90 U
0.0190 U
0.0190 U
0.0170 U
0.0170 U
2015-02-02 Dubuque-PNG Groundwater (10-14)
Silty Sand Aquifer Wells (3)
2/2/2015
46 of 77
CZ3
CU i 3
-------
c=3 a a d} cz3 . d u
GROUNDWATER ANALYTICAL RESULTS
MIDAMERICAN ENERGY COMPANY
PEOPLES NATURAL GAS SITE
DUBUQUE, IOWA
Sample Location:
W-118R
W-118R
W-118R
W-118R
W-118R
W-118R
W-118R
W-118R
W-118R
Screened Unit:
Silty Sand
Silty Sand
Silty Sand
Silty Sand
Silty Sand
Silty Sand
Silty Sand
Silty Sand
Silty Sand
Depth BTOC (feet):
29.0
29.0
29.0
29.0
29.0
29.0
29.0
29.0
29.0
Sample Date:
15-Sep-09
30-Mar-10
05-May-10
15-Sep-10
27-Apr-11
19-Sep-11
25-Apr-12
24-Sep-12
30-Apr-13
Cleanup
Analyte
Units
Level
Benzene.
Mg/L
5
230
1.00 u
na
220
26.1
6.19
48
39.9
1.51
Toluene
pg/L
1,000
5:98
1.00 u
na
1.00 U
1.00 U
' 1.00 U
1.00 U
1.00 U
1.00 U
Ethylbenzene
pg/L
700
61.4
1.00 u
na
1.27
1.00 U
1.00 U
1.00 U
1.00 U
1.00 U
Xylenes.
fjg/L
10,000
22
6.00 U
na
3.00 U
3.00 U
3.00 U
3.00 U
3.00 U
3.00 U
2-Methylnaphthalene
pg/L
—
na
na
na
na
na
na
0.100 U
0.210
na
Dibenzofuran
MQ/L
—
na
na
na
na
na
na
na
na
na
Acenaphthene
pg/L
~
7.83
0.0220 U
14.1
15.8
8.61
0.0220 U
1.63
1.96
1.66
Acenaphthylene
pg/L
~
17.8
0.0870 U
27.2
24.7
5.42
4.57
1.28
* 1.87
' 1.6
Anthracene
pg/L
—
0.0107 J
0.0100 U
0.0100 U
0.0568 J
0.0258 J
0.0100 U
0.0100 U
0.0468 J
0.102 U
Benzo(a)anthracene
|jg/L
0.1
0.00500 U
0.00500 U
0.00500 U
0.00500 U
0.0200 U
0.0200 U
0.0200 U
0.0200 U
0.102 U
Benzo(a)pyrene
Mg/L
0.2
0.00800 U
0.00800 U
0.00800 U
0.00800 U
0.00800 U
0.00800 U
0.00800 U
0.00800 U
0.102 U
Benzo(b)fluoranthene
pg/L
0.1
0.0280 U
0.0280 U
0.0280.U
0.0280 U
0.0280 U
0.0280 U
0.0280 U
0.0280'U
0.102 U
Benzo(g,h,i)perylene
pg/L
—
0.00800 U
0.00800 U
0.00800 U'
0.00800 U
0.00800 U
¦0.00800 U
0.00800 U
0.00800 U
0.204 U
Benzo(k)fluoranthene
pg/l
0.29
0.00700 U
0.00700 U
0.00700 U
0.00700 U
0.00700 U
0.00700 U
0:00700 U
0.00700 U
0 .102 U
Chrysene -
Mg/L
2.9
0.00800 U
0.00800 U
0.00800 U
0.00800 U
0.00800 U
0.00800 U
0.00800 U
0.0161 J
0.102 U
Dibenzo(a,h)anthracene
pg/L
0.013
0.0100 U
0.0100 U
0.0100 U
0.0100 U
0.0100 U
0.0100 U
0.0100 U
0.0100 U
0.102 U
Fluoranthene
pg/L
—
0.0100 U
0.0100 u
0.0100 u
0.0100 U
0.0100 U
0.0100 U
0.0100 U
0.0607 J
0.102 U
Fluorene
pg/L.
—
3.83
0.364
1.01
3.51
0.59
1.06
0.0160 U
0.492
0.491
lndeno(1,2,3cd)pyrene
pg/L
• 0.1
0.00600 U
0.00600 U
0.00600 U
0.00600 U
0.00600 U .
0.00600 U
.0.00600 U
0.00600 U
0.102 U
Naphthalene
pg/L
0.14
49.6.
R
0.0460 U
0.0460 U
0.0460 U
0.332 B
0.0460 U
0.591 .
0.204 U
Phenanthrene
pg/L
~
0.222
0.00500 U
0.435
0.868
0.0566 J
0.00500 U
0.00500 U
0.141
0.102 U
Pyrene
pg/L
~
0.0170 U
0.0170 U
0:0170 U
0.0170 U
0.0170 U
0.0170 U
0.0170 U
0.0556 J
0.102 U
2015-02-02 Dubuque-PNG Groundwater (10-14)
Silty Sand Aquifer Wells (3)
2/2/2015 47 of 77
-------
GROUNDWATER ANALYTICAL RESULTS
MIDAMERICAN ENERGY COMPANY
PEOPLES NATURAL GAS SITE
DUBUQUE, IOWA
Sample Location:
W-118R
W-118R
W-118R
W-128
W-128
W-128
W-128
W-128
Screened Unit:
Silty Sand
Silty Sand
Silty Sand
Silty Sand
Silty Sand
Silty Sand
Silty Sand Silty Sand
Depth BTOC (feet):
29.0
29.0
29.0
24.8
24.8
24.8
24.8
24.8
Sample Date:
04-Sep-13
25-Mar-14
21-Oct-14
10-Jul-07
20-Sep-07
05-May-08
0
1
O
0
1
- o
00
28-Apr-09
Cleanup
Analyte
Units
Level
Benzene
Mg/L
5
0.500 U
0.500 U
0.500 U
1.00 U
1.00 u
1.00 u
1.00 u
1.00 u
Toluene
mq/l
1,000
1.00 U
1.00 U
1.00 U
1.00 U
1.00 u
1.00 u
1.00 U,L5
1.00 U •
Ethylbenzene.
mq/l
700
1.00 U
1.00 U
1.00 U
1.00 u
1.00 u
1.00 u
1.00 u
1.00 u
Xylenes..
mq/l
10,000
3.00 U
3.00 U
3.00 U
3.00 U
3.00 U
3.00 U
3.00 U
3.00 U
2-Methylnaphthalene
pg/L
—
na
na
<0.100 UJ
na
na
na
' na
na
Dibenzofuran
Mg/L
—
na
na
na
na
na
na
na
na
Acenaphthene
Mg/L
—
0.208
1.17
0.459 J-
4.16
5,25
4.19
5.27
3.91
A'cenaphthylene
pg/L
--
0.0879 U
0.426 U
0.196 J-
0.0850 U
0.0850 U
0.0850 U
0.0870 U
0.0870 U
Anthracene
pg/L
--
0.0101 U
.0.106 U
<0.100 UJ
0.405
0.128 J
0.0764 J
0.0754 J
0.0936 J
Benzo(a)anthracene
pg/L
0.1
0.0202 U
0.106 IT
<0.100 UJ
0.189
0.124 J
0.0553 J
0.0536 J
0.112 J
Benzo(a)pyrene
pg/L
0.2
0.00808 U
0.106 U
<0.100 UJ
. 0.197
0.147 J
0.120 J
0.088 J
0.169 J
Benzo(b)fluoranthene
pg/L
0.1
0.0283 U
0.106 U
<0.100 UJ
0.292
0.239
0.0130 U
0.0280 U
0.238
Benzo(g,h,i)perylene
pg/L
-
0.00808 U
0.213 U
<0.100 UJ
0.114 .
0.2
0.0877 J
0.00800 U
0.117
Benzo(k)fluoranthene
pg/L
0.29
0.00707 U
0.106 U
<0.100 UJ
0.139 J
0.116 J
0.0150 U
0.00700 U
0.0510 J
Chrysene
Mg/L
2.9
0.00808 U
0.106 U
<0.100 UJ
0.218
0.218
0.162
0.164
0.205
Dibenzo(a, h)anthracene
pg/L
0.013
0.0101 U
0.106 U
<0.170 UJ
0.0100 U
0.0235 J
0.0100 U
0.0100 U
0.0100 U
Fluoranthene
pg/L
—
0.0101 U
0.106 U
<0.100 UJ
1.53
0.63 .
0.334
0.306
0.375
Fluorene
Mg/L
—
0.221
0.106 U
<0.100 UJ
0.685
0.772
0.551
0.67
0.0160 U
lndeno(1,2,3cd)pyrene
Mg/L
0.1
0.00606 U
0.106 U
<0,100 UJ
0.165
0.144
0.0696 J
0.00600 U
0.119
Naphthalene
mq/l
0.14
0.0465 U
0.213 U
<0.100 UJ
0.354
0.627.
0.0540 U
0.0460 U
0.0460 U
Phenanthrene
pg/L
—
0.00505 U
0.106 U
<0.100 UJ
0.329
0.653
0.113
0.0734 J
0.0879 J
Pyrene
Mg/L
--
0.0172-U
0.106 U
<0.100 UJ
2.35
1.31
0.485
0.481
0.221
2015-02-02 Dubuque-PNG Groundwater (10-14)
Silty Sand Aquifer Wells (3)
2/2/2015 48 of 77
ClZj XZU d~3 UZ~j CZS CZT? C~J U C_J L—i t 7 i—J L__J I 1' . " i L_
-------
CT3 EZZ3 ETZ3 CT3 C3 CZH CLZ3 C__J l
GROUNDWATER ANALYTICAL RESULTS
MIDAMERICAN ENERGY COMPANY
PEOPLES NATURAL GAS SITE
DUBUQUE, IOWA
Sample Location:
W-128
W-128
W-128
W-128
W-128
W-128
W-128
W-128
Screened Unit:
Silty Sand
Silty Sand
Silty Sand
Silty Sand
Silty Sand
Silty Sand
Silty Sand
Silty Sand
Depth BTOC (feet):
24.8
24.8
24.8
24.8
24.8
24.8
24.8
24.8
Sample Date:
16-Sep-09
30-Mar-10
15-Sep-10
27-Apr-11
19-Sep-11
25-Apr-12
25-Sep-12
30-Apr-13
Cleanup
Analyte
Units
Level
-
Benzene
. Mg/L
5
1.00 u
1.00 u
1.00 u
1.00 u
1.00 u
1.00 u
1.00 u
0.50 U
Toluene
|jg/L
1,000
1.00 u
1.00 u
1.00 u
1.00 u
1.00 u
1.00 u
1.00 u
1.00 U
Ethylbenzene
|jg/L
700
1.00 u
1.00 u
1.00 u
1.00 u
1.00 u
1.00 u
1.00 u
1.00 U
Xylenes
pg/L
10,000
3.00 U
6.00 U
3.00 U
3.00 U
3.00 U
3.00 U
3.00 U
3.00 U
2-Methylnaphthalene
pg/L
—
na
na
na
na
na
0.100 u
0.220
na
Dibenzofuran
Mg/L
—
na
na
na
na
na
na
na
na
Acenaphthene
pg/L
--
. 4.01
3.24
2.08
1.72
2.44
1.66
2.85
1.98
Acenaphthylene
pg/L
—
0.0870 U
0.0870 U
0.0870 U
0.0870 U
0.0870 U
0.0870 U
0.0870 U
0.404 U
Anthracene
pg/L
—
0.0579 J
0.0291 J
0.0559 J
0.0462 J
0.0100 U
0.0100 U
0.0624 J
0.101 U
Benzo(a)anthracene
pg/L
0.1
0.0698 J
0.0374 J
0.0547 J
0.0546 J
0.0306 J
0.0200 U
0.0447 J
0.101 U
Benzo(a)pyrene
pg/L
0.2
0.0807 J
0.00800 U
0.00800 U
0.0417 J
...0.00800 U
0.00800 U
0.0405 J
0.101 U
Benzo(b)fluoranthene
•pg/L
0.1
0.0929 J
0.0280 U
.0.0280 U
0.0280 U
0.0280 U
0.0280 U
0.0280 U
0.101 U
Benzo(g,h,i)perylene
pg/L
—
0.112
0.00800 U
0.00800 U
0.0479 J
0.00800 U
0.00800 U
0.0340 J
0.202 U
Benzo(k)fluoranthene
|jg/L
0.29
0.0375 J
0.00700 U
0.00700 U
0.00700 U
0.00700 U
0.00700 U
0.00700 U
0.101 U
Chrysene
pg/L
2.9
0:0657 J
0:00800 U
0.0982 J
0.0831 J
0.00800 U
0.00800 U
0.0767 J
0.101 U
Dibenzo(a,h)anthracene
pg/L
0.013
0.0100 U
0.0100 U
0.0100 U
0.0100 U
0.0100 U
0.0100 U
0.0100 U
0.101 U
Fluoranthene
pg/L
—
0.17: J
0.0537 J
0.0100 U
0.0100 U
0.0100 U
0.0100 u
0.0894 J
0.101 U
Fluorene
pg/L
—
0.452
0.0160 U
. 0.0160 U
0.0160 U
0.0160 U
0.0160 U
0.01.60 U
0.101 U
lndeno(1,2,3cd)pyrene ,
pg/L
0.1
0.0612 J
0.00600. U
.0.00600 U
0.00600 U
0.00600 U
0.00600 U
0.00600 U
0.101 u
Naphthalene
pg/L
0.14
0.225
R
0.0460 U
0.0460 U
1.09 B
0.0460 U
0.795
0.202 U
Phenanthrene
pg/L
—
0.0511 J
0.00500 U
0.00500 U
0.03 J
0.00500 U
0.00500 U
0.160
0.101 U
Pyrene
pg/L
0.11 J
0.0170 U
0.0170 U
0.0915 J
0.128 J
0.0170 U
0.115 J
0.101 U
2015-02-02 Dubuque-PNG Groundwater (10-14)
Silty Sand Aquifer Wells (3)
2/2/2015
49 of
-------
GROUNDWATER ANALYTICAL RESULTS
MIDAMERICAN ENERGY COMPANY
PEOPLES NATURAL GAS SITE
DUBUQUE, IOWA
Sample Location:
W-128
W-128
W-128
W-129
W-130
Screened Unit:
Silty Sand
Silty Sand
Silty Sand Silty Sand Silty Sand
Depth BTOC (feet):
24.8
24.8
24.8
41.8
40.7
Sample Date:
04-Sep-13
25-Mar-14
21-Oct-14 21-Oct-14 21-Oct-14
Cleanup
Analyte
Units
Level ""
Benzene
mq/l
5
0.500 U
0.500 U
0.500. U
13.4
3.58
Toluene
mq/l
1,000
1.00 U
1.00 U .
1.00 U
; too u
1.00 U
Ethylbenzene
mq/l
700
1.00 U
1.00 U ''
1.00 u"-
1.00 u
1.00 U
Xylenes
Mg/L
10,000
3.00 U
3.00 U
3.00 U
3.00 U
3.7
2-Methyl'naphthalene
Mg/L
— ¦
na
na
1.00 U
0.103
0.21
Dibenzofuran
yg/L
—
na
na
na
na
na
Acenaphthene
Mg/L
--
0.383
2.81
2.46
23.2
15.5
Acenaphthylene
pg/L
--
0.0897 U
0.421 U
1.00 U
3.23
11.4
Anthracene
Mg/L
—
0.0103 U
0.105 U
1.00 U
0.37
0.109
Benzo(a)anthracene
Mg/L
0.1
0.0206 U
0.105 U
1.00 U
1.00 U
1.00 U
Benzo(a)pyrene
(jg/L
0.2
0.00825 U
0.105 U
1.00 U
1.00 U
1.00 U
Benzo(b)fluoranthene
yg/L
0.1
0.0289 U
0.105 U
1.00 U
1.00 U
1.00 U
Benzo(g,h,i)perylene
pg/L
-
0.00825 U
0.211 U
1.00 U
1.00 U
1.00 U
Benzo(k)fluoranthene
Mg/L
0.29
0.00722 U
0.105 U
1.00 U
1.00 U ¦
1.00 U
Chrysene
Mg/L
2.9
0.00825 U
0.105 U
1.00 U
1.00 U
1.00 U
Dibenzo(a,h)anthracene
Mg/L
0.013
0.0103 U
0.105 U
0.0170 U
0.0170 U
0.0170 U
Fluoranthene
mq/l
— .
0.0103 U
0.105 U.
1.00 u.
1.00 U
1.00 U
Fluorene
Mg/L
—
0.0165. U
0.105 U
1.00 U
3.18
0.898
lndeno(1,2,3cd)pyrene
pg/L
0.1
0.00619 U.
0.105 U
1.00 u
1.00 U
1.00 U .
Naphthalene
pg/L
0.14
0.0474 U
0.211 U
1.00 u
0.899
1.56
Phenarithrene
Mg/L
—
0.0391 J
0.105 U
1.00 u
0.833
0.163
Pyrene
Mg/L
—
0.0175 U
0.105 U-
1,00 u
1.00 U
1,00 U
2015-02-02 Dubuque-PNG Groundwater (10-14)
Silty Sand Aquifer Wells (3)
2/2/2015
50 of 77
m a £=~ a c=j c=3 ez=? cu zzn j eu
-------
ezd cza czr ..era 'era era err era cm
C—J
GROUNDWATER ANALYTICAL RESULTS
MIDAMERICAN ENERGY COMPANY
PEOPLES NATURAL GAS SITE
DUBUQUE, IOWA
Sample Location:
W-13
W-13
W-13
W-13
W-13
W-13
W-13
W-13
W-13
Screened Unit:
Alluvial
- Alluvial
Alluvial
Alluvial
Alluvial
Alluvial
Alluvial
Alluvial
Alluvial
Depth BTOC (feet):
48.0
48.0
48.0
48.0
48.0
48.0
48.0
48.0
48.0
Sample Date:
10-0ct-05
14-Mar-06
11-Sep-06
17-Apr-07
19-Sep-07
05-May-08
30-Sep-08
28-Apr-09
15-Sep-09
Cleanup
Analyte
Units
Level
.
Benzene
Mg/L
5
1.0 u
1.0 U
1.00 u
- 1.00 u
1.00 u
1.00 u
1.00 u
1.00 u
1.00 u
Toluene
MQ/L
1,000
1.0 u
1.0 u
1.00 u
1.00 u
1.00 u
100 u
1.00 U,L5
1.00 u
1.00 u
Ethylbenzene
pg/L
700
1.0 u
1.0 u
1.00 u
1.00 u
- 1.00 u
1.00 u-
1.00 U
1.00 u
1.00.U
Xylenes
|jg/L
10,000
1.0U
1.0 u
3.00 U
3.00 U
3.00 U
3.00 U
3.00 U
3.00 U
3.00 U
2-Methylnaphthalene
Mg/L
—
na
na
na
na
na
na
na.:
na
na
Dibenzofuran
M9/L
—
na
na
na
na
na
ria
na
na
na
Acenaphthene
Mg/L
—
2.4 U
2.5 U*
0.0490 U
0.0544 U
0.0490 U
0.0490 U
0.0220 U
0.0220 U
0.0220 U
Acenaphthylene
pg/L
—
1.2 U
1.3 U*
0.0850 U
0.0944 U
0.0850 U
0.0850 U
0.0870 U
0.0870 U
0.0870 U
Anthracene
¦|jg/L
--
0.048 U
0.050 U*
0.0100 U
0.011T.U
0.0100 U
0.0100 U
0.0100 U
0.0100 U
0.0100 U
Benzo(a)anthracene
Mg/L
0.1
0.020 Ja
0.13 U
0.015 J
0.00333 U
0.00300 U
0.00300 U
0.00500 U
0.00500 U
0.00500 U
Benzo(a)pyrene
M'g/L
0.2
0.021 Ja .
0,13 U
0.0320 U
0.0356 U
0.0320 U
0.0320 U
0.00800 U
0.00800 U
0.00800 U
Benzo(b)fluoranthene
pjg/L
0.1
0.048 U
0.050 U
0.0130 U
0.0144 U
0.0130 U
0.0130 U
0:0280 U
0.0280 U
0.0280 U
Benzo(g,h,i)perylene
Mg/L
—
0.19 U
0.20 U
0.00900 U
0.0100 U
0.00900 U
0.00900 U
0.00800 U
0.00800 U
0.00800 U
Benzo(k)fluoranthene
Mg/L
0.29
0.048 U
0.050 U
0.0150 U
0.0167 U
0.0150 U
0.0150 U
0.00700 U
0.00700 U
0.00700 U
Chrysene
Mg/L
2.9
0.12 U
0.13 U
0.0431 J
0.00556 U
0.00500 U
0.00500 U
0.00800 U
0.00800 U
0.00800 U
Dibenzo(a,h)anthracene
Mg/L
0.013
0.29 U
0.30 U
0.0100 U
0.0111 U
0.0100 U
0.0100 U
0.0100 U
0.0100 U
0.0100 U
Fluoranthene
Mg/L
T-
0.048 Ja
0.13 U
0.0100 U
0.0111 U
0.0100 U
0.0100 :U
0.01.00 U
0.0100 u
0.0100 u
Fluorene
Mg/L
0.24 U
0.25 U*
0.0100 U
0.0111 U
0.0100 u
0.0100 u
0.0160 U
0:0160 U.
0.0160 U
lndeno(1,2,3cd)pyrene
Mg/L
0.1
-0.12 U
0.1.3 U
0.00700 U
0.00778 U
0.00700 U
0.00700 U
0.00600 U
0.00.600 U
0.00600 U
Naphthalene
Mg/L
0.14
1.2 U
1.3 U*
0.0540 U
0.117 B
0.0540 U
0.0540 U
0.0460 U
0.0460 U
0.0589 J
Phenanthrene
Mg/L.
—
0.096 U
0.099 Ua
0.0292 J
0.0115 J
0.00700 U
0.00700 U
0.0137 J
0.00500 U
0.00500 U
Pyrene
Mg/L
—
0.048 Ja '
0.25 U
0.16 J
0.0211 U
0:0190 U
0.0190 U
0.0170 U
0.0170 U
0.0170 U
2015-02-02 Dubuque-PNG Groundwater (10-14)
Alluvial Aquifer Wells
2/2/2015
51 of 77
-------
GROUNDWATER ANALYTICAL RESULTS
MIDAMERICAN ENERGY COMPANY
PEOPLES NATURAL GAS SITE
DUBUQUE, IOWA
Sample Location:
W-13
W-13
W-13
W-13
W-13
W-13
W-13
W-13'
W-13
Screened Unit:
Alluvial
Alluvial
Alluvial
Alluvial
Alluvial
Alluvial
Alluvial
Silty Sand
Alluvial
Depth BTOC (feet):
48.0
48:0
48.0
48.0
48.0
48.0
48.0
35.8
48.0
* c ••
' Sample Date:
30-Mar-10
05-May-10
15-Sep-10
27-Apr-11
19-Sep-11
24-Apr-12
25-Sep-12
30-Apr-13
04-Sep-13
Cleanup
Analyte
Units Level
Benzene r
pg/L
5
1.00 u
na
• 1.00 u
1.00 u
1.00 u
1.00 u
1.00 u
0.50 U
0.500 U
Toluene
pg/L
; 1,000
1.00 u :
na
1.00 u
,1.00 u
1.00 u
1.00 u
1.00 u
1.00 U
1.00 U
Ethylbenzene
Mg/L
700
1.00 u
na
1.00 u
1.00 u
1.00 u
1.00 u
1.00 u
1.00 U
1.00 U
Xylenes
Mg/L
10,000 .
6.00 U
na
3.00 U
3.00 U
3.00 U
3.00 U
3.00 U
3.00 U
3.00 U
2-Methylnaphthalene
—
na
na
na
na
na
0.100 u
0.167 J
na
na
Dibenzofuran
pg/L
-
na
na
na'
na
na
na
na
na
na
Acenaphthene- ¦
Mg/L
...
0.234
0:0220 U
0.0220 U
0.0220 U
0.0220 U
0.0220 U
0.0286 J
0.204 U
0.0224 U
Acenaphthylene
(jg/L
—
0.0870 U
0.0870 U
0.0870 U
0.0870 U
0.0870 U
0.0870 U
0.0870 U
0.408 U
0.0888 U
Anthracene
MQ/L
~
0.0100 U
0.0100 U
0.0100 U
0.0100 U
0.0100 U
0.0100 U
0.0399 J
0.102 U
0.0102 U
Benzo(a)anthracene
pg/L
0.1
0.00500 U
0.00500 U
0.00500 U
0.0200 U
0.0200 U
0.0200 U
0:0200 U
0.102 U
0.0204 U
Benzo(a)pyrene
Mg/L
0.2
0.00800 U
0.00800 U
0.00800 U
0.00800 U
0.00800 U
0.00800 U
0.00800 U
. 0.102 U
0.0286 U
Benzo(b)fluoranthene
pg/L
0.1
0.0280 U
0.0280 U
0.0280 U
0.0280 U
0.0280 U
0.0280 U
0.0280 U
0.102 U
0.00714 U
Benzo(g,h,i)perylene
pg/L
. --
0.00800 U
0.00800 U
0.00800 U
0.00800 U
0.00800 U
0.00800 U
0.00800 U
. 0.204 U
0.00816 U
Benzo(k)fluoranthene
mq/l
0.29 ¦
0.00700 U
0.00700 U
0.00700 U
0.00700 U
0.00700 U
0.00700 U
0.00700 U
0.102 U
0.00816 U
Chrysene
pg/L
2.9
0.00800 U
0.00800 U
0.00800 U
0.00800 U
0.00800 U
0.00800 U
0.0216 J
0.102 U .
0.00816 U
Dibenzo(a,h)anthracene
pg/L
0.013
0.0100 U
0.0100 U
0.0100 U
0.0100 U
0.0100 U
0.0100 U
0.0100 U
0.102 U
0.0102 U
Fluoranthene
pg/L
0.0100 u
0.0100. u
0.0100 u
0.0100 u
0.0100 u
0.0100 u
0.0672 J
0.102 U
0.0102 U
Fluorene
pg/L
¦
0.0160 U
0.0160 U
0.0160 U
0.0160 U
0.0160 U
0.0160 U
0.0160 U
0.102 U
0.0163 U
lndeno(1,2,3cd)pyrene
pg/L
0.1 :
0.00600 U
0.00600 U
0.00600 U
0.00.600 U
0.00600 U
0.00600 U
0.00600 U
0.102 U
0.00612 U
Naphthalene
pg/L
0.14
R
0.0460 U
0.0645 J
0.0460 U
0.0952 J,B
0.0460 U
0.404
0.204.U
0.0469 U
Phenanthrene
pg/L
—
0.00500 U
0.00500 U
0.00500 U
0.00500 U
0.00500 U
0.00500 U
0.127
0.102U
0.00510 U
Pyrene
" pg/L
—
0.0170 U
0.0170 U
0.0170 U
0.0170 U
0.0170 U
0.0170 U
0.0696 J
0.102 U
0.0173 U
2015-02-02 Dubuque-PNG Groundwater (10-14)
Alluvial Aquifer Wells
2/2/2015
o £33 E=3
a ezu cj c__>
52 of 77
1 r
-------
CZ3 CH3 C3 C] ~ U U
l
GROUNDWATER ANALYTICAL RESULTS
MIDAMERICAN ENERGY COMPANY
PEOPLES NATURAL GAS SITE
DUBUQUE, IOWA
Sample Location:
W-13
W-13
W-15
W-15
W-15
W-15
W-15
W-15
W-15
Screened Unit:
Alluvial
Alluvial
Alluvial
Alluvial
Alluvial
Alluvial
Alluvial
Alluvial
Alluvial
Depth BTOC (feet):
48.0
48.0
53.0
53.0
53.0
53.0
53.0
53.0
53.0
Sample Date:
25-Mar-14
21-Oct-14
24-Sep-96
CO
O)
1
Q.
-------
GROUNDWATER ANALYTICAL RESULTS
MIDAMERICAN ENERGY COMPANY
PEOPLES NATURAL GAS SITE
DUBUQUE, IOWA
Sample Location:
W-15
W-15
W-15
W-15
W-15
W-15
W-15
W-15
W-15
r
Screened Unit:
Alluvial
Alluvial
: Alluvial
Alluvial
Alluvial
Alluvial
Alluvial
Alluvial
Alluvial
Depth BTOC (feet):
53.0
53.0
53.0
53.0
53.0
53.0
53.0
53.0
53.0
4'
Sample Date:
17-Mar-98
16-Jun-98
29-Sep-98
09-Dec-98
23-Mar-99
23-Jun-99
28-Sep-99
15-Dec-99
15-Mar-OO
Cleanup
Analyte
Units
Level
'
¦
Benzene
pg/L
5
ru
1 U
na
1 U
1 u
1 U
1 U
4.1
3
Toluene
pg/L
1,000
1 u
1 u
na
1 U
1'U
1 U
1 U
0.56
1.9
Eth'ylbenzene
Mg^L
700
1 u
1 u
na
1 u
1 U
1 u
1 u
2.4
2.8
Xylenes
M.g/L
10,000
1 u
1
na
3
11
1 u
1 u
1.5
4 ,
2-Methylnaphthalene
pg/L
—
10U
10U
10'U
10 U
10 u
10 u
10 u
10U
2.0 U
Dibenzofuran
MQ/L
~
10 u
10 u
10 U
10 U
10 u
10 u
10 u
10 U
na.
Acenaphthene
pg/L
~
10 u
10U
10 U
10 U
10 u
mu
10 u
10 U
0.59
Acenaphthylene
pg/L
~
10U
10 u
10 U
10 U
10 u
10 u
10 u
10U
1.2
Anthracene
pg/L
—
10U
10 u
10 U
10 u
10 u
10 u
10 u
10 u
0.15
Benzo(a)anthracene
Mg/L
0.1 .
10 u
10 u
10 U
10 u
10 u
10U
10 u
10U
0.029
Benzo(a)pyrene
Mg/L
0.2
10 u
10 u
10 U
10 u
10 u
10U
10 u
10 u
0.05
Benzo(b)fluoranthene
pg/L
0.1
10 u
10 u
10 U
10 u
10 u
10 u
10 u
10 u
0.038
Benzo(g,h,i)perylene
pg/L
-¦
10 u
10 u
10 U
10 u
10 u
10 u
10 u
10U
0.043
Benzo(k)fluoranthene
.pg/L
0.29
10 u
10 u
10 U
10 u
10 u
10 u
10 u
10U
0.10 u'
Chrysene
pg/L
2.9
10 u
10 u
10U
10 u
10 u
10 u
10 u
10 u
0.034
Dibenzo(a,h)anthracene
pg/L
0.013
10 u
10 u
10 U
10 u
10 u
10U
10 u
10 u
0.20 U
Fluoranthene
pg/L
' ' —
10 u
10U
10 U
10 u
10 u
. 10U
10U
10U
0.12
Fluorene
pg/L
10 u
10 u
10 u
10 u
10 u
10 u
10 u
10 u
0.079
lndeno(1,2,3cd)p yrene
pg^L
0.1
10-U-
10 u
10 u
10 u
10 u .
10U
10 u
10 U'
0.091
Naphthalene
pg/L
1 0.14
10 u
10 u
5
10 u
10 u
10 u
10 u
5
2.5
Phenanthrene
pg/L
—
10 u
10 u
10 U
10 u
10 u
.10 u
10 u
10 u
0.27
Pyrene
pg/L
-
10 u
10 u
10 U
10 u
10U
10U
10 u
10U
0.13
2015-02-02 Dubuque-PNG Groundwater (10-14)
Alluvial Aquifer Wells
2/2/2015
54 of 77
-------
CH! C
1 EZS IHZ3 Cj C^_3
GROUNDWATER ANALYTICAL RESULTS
MIDAMERICAN ENERGY COMPANY
PEOPLES NATURAL GAS-SITE
DUBUQUE, IOWA
Sample Location:
W-15
W-15
W-15
W-15
W-15
W-15
W-15
W-15
W-15
Screened Unit:
Alluvial
Alluvial
Alluvial
Alluvial
Alluvial
Alluvial
Alluvial
Alluvial
Alluvial
Depth BTOC (feet):
53.0
53.0
53.0
53.0
53.0
53.0
53.0
53.0
53.0
Sample Date:
06-Jun-00
14-Sep-OO
14-Dec-00
20-Mar-01
06-Jun-01
19-Sep-01
11-Dec-01
13-Mar-02
05-Jun-02
Cleanup
Analyte
Units
Level
Benzene
pg/f-
. 5
5.1
1 U
' 1 U
0.2 J
1 U
1 U
1 U
1 U
1 U
Toluene
pg/L
1,000
1.4
1.U
0.17 J
0.24 J
1 u
1 u
0.23 J
. 1U
1 U
Ethylbenzene
pg/L
700
3.5
1 u
1 U
1 u.
¦ 1 u
1 u .
0.96 J
1:2
1 u
Xylenes
pg/L
10,000
2.8
1 u
0.45 J
0.69 J
1 u
1 u
0.41 J
1 u
1 u
2-Methylnaphthalene
pg/L
—
10 U
10 u
10 U
10 U
10 u
10U
10U
10 U
10 u
Dibenzofuran
pg/L
—
10 U
10 u
.10 U
10U
10 u
10 u
10U
10U
10 u
Acenaphthene
pg/L
-
10 U
10 u
10 U
10 U
10U
10 u
10 U
10U
10U
Acenaphthylene
pg/L
—
10 U
10 u
10 U
10 U
10 u
'10 u
10 U
10 u
10 u
Anthracene
Mg/L
—
10 U
10 u
10 U
10 U
10 u
10U
10 U
10 u
. 10 u
Benzo(a)anthracene
pg/L
0.1.
10 U
10 u
10 U
10 U
10 u
10 u
10 U
10 u
10U
Benzo(a)pyrene
pg/L
0.2
10 U
. 10 u
10U
10 U
10 u
10 u
10U
10 u
10U
Benzo(b)fluoranthene
pg/L
0.1
10U
10U
10 u
10U
10 u
10U
10U
.10 u
10 u
Benzo(g,h,i)perylene
pg/L
~
10 U
10 u
10 u
10 U
10 u
10 u
10 U
10 u
10 u
Benzo(k)fluoranthene
pg/L
0.29
10 U
10U
10 u
10 U
10 u
10 u
10 U
10U
10 u
Chrysene
pg/L
2.9
10 U
10U
10 u
10U
10 u
10 u
10 U
10 u
10 u
Dibenzo(a,h)anthracene
pg/L
0.013
10 u.
10 u
10U
10 u
10 u
10 u
10 u
10U
10 u
Fluoranthene
pg/L
10 U
10U
10U .
10 u
10 u
10U
10U
10U •
10 u.
Fluorene
pg/L
10U
10 u
10 u
10U
10 u
10 u
10 u
10 u
10 u
lndeno(1,2,3cd)pyrene
pg/t-
0.1
10U
10 u
10U .
10 u .
10 u.
10.U
10 U:
10U
10 u
Naphthalene
pg/L
0.14
10 U
10 u
10.U
10 u
10 u
10 u
1J
4.6 J
10 u
Phenanthrene
pg/L
10 u
. 10 u
10 u
10 u
10 u
10 u
0.3 J
0.3 J
10 u
Pyrene
pg/L
—
10U
¦10 U".
.10U
'10U
10 u
¦ 10 u
•'¦'10 u
10 u
10 u
2015-02-02 Dubuque-PNG Groundwater (10-14)
Alluvial Aquifer Wells
2/2/2015
55 of 77
-------
GROUNDWATER ANALYTICAL RESULTS
MIDAMERICAN ENERGY COMPANY
PEOPLES NATURAL GAS SITE
DUBUQUE, IOWA
Sample Location:
W-15
W-15
W-15
W-15
W-15
W-15
W-15
W-15
W-15
Screened Unit:
Alluvial
Alluvial
Alluvial
Alluvial
Alluvial
Alluvial
Alluvial
Alluvial
Alluvial
Depth BTOC (feet):
53.0
53.0
53.0
53.0
53.0
53.0
53.0
53.0
53.0
Sample Date:
00
1
C/>
CD
"O
i
o
K>
. O
i
D
CD
0
1
o
ro
10-Jun-03
30-Mar-04
15-Sep-04
15-Mar-05
11 -Oct-05
15-Mar-06.
12-Sep-06
Cleanup
Analyte
Units
Level
Benzene .
Mg/L
5
1 u
0.59
2 U
1.0 U
1.0U .
1.0 U
1.0 u
1.0 U
1.00 u
Toluene'
Mg/L
1,000
1 u
1 U
2 U
1.0 u
1.0 u
1.0 u
1.0 u.
1.0 u
1.00 u
Ethylbenzene
pg/L
700 '
1 u
¦1 u
2 U
1.0 u
1.0 u
1.0 u
1.0 u
1.0 u
1.00 u
Xylenes
Mg/L
10,000
1 u
1 U
7 U
1.0 u
1.0U
1.0 u
1.0 u
1.0 u
3.00 U
2-Methylnaphthalene
pg/L
—
10 u
10U .
na
na
na
na
na
na
na
Dibenzofuran
Mg/L
—
10 u
10 U
na
na
na
na
na
na
na
Acenaphthene
Mg/L
—
10 u
10.U
0.1 U
2.4 U
2.4 U
2.4 U
2.4 U
2.5 U
0.0557 U
Acenaphthylene
jjg/L
~
10 u
10 U
0.1 U
1.2 U
1.2 U
1.3 U
1.2 U
1.3 U
0.0966 U
Anthracene
MQ/L
~
10 u
10 U
0.1. U
0.048 U
0.048 U
0.049 U
0.084
0.051 U
0.0114 U
Benzo(a)anthracene
Mg/L
0.1
10 u
10 U
0.1 U
0.12 U
0.12 U
0.13 U
0.059 Ja
0.13 U
0.00341 U
Benzo(a)pyrene
pg/L
0,2
10 u
10 U
0.1 U
0.12 U
0.12 U
0.13 U
0:12 U
0.13 U
0.0364 U
Benzo(b)fluoranthene
Mg/L
0.1
10 u
10 u
0.1 U
0.048 U
0.048 U
0.049 U
0.035 Ja
0.051 U
0.0148 U
Benzo(g,h,i)perylene
pg/L
--
10 u
10 u
0.1 U
0.19 U
0.19 U
0.19 U
0.19 U
0.20 U
0.0102 U
Benzo(k)fluoranthene
Mg/L
0.29
10U
10 u
0.1 U
0.048 U
0.048 U
0.049 U
0.048 U
0.051 U
0.0170 U
Chrysene
Mg/L
2.9
10 u
10 u
0.1 U
0.12 U
0.12 U
0.13 U
0.032 Ja
0.13 U
0.00568 U
Dibenzo(a,h)anthracene
Mg/L
0.013
10 u
10 u
0.1 U
0.29 U
0.29 U
0.29 U
0.29 U
0.30 U*
0.0114 U
Fluoranthene
Mg/L
¦
10 u
10 u .
0.1 u
0.12 U
0.12 U
0.13 U
0.12 J ¦
0.13 U
0.0114 U
Fluorene
Mg/L
—
10 u
10 u
0.1 u
0.24 U
0.24 U
0.24 U
0.24 U
0.25 U
0.0114 U
lndeno(1,2,3cd)pyrene
Mg/L
0.1
10 u
10 u
0.1 u-
0.12 U
0.12 U
0.13 U
0.12 U
0.13 U
0.00795 U
Naphthalene
Mg/L
0.14
2.2 J
10
0.1 u
1.2 U
1.2 U
1.3 U
1.2 U
1.3 U
0.0614 U
Phenanthrene
Mg/L
—
10 u
10 u
0.1 u
0.096 U
0.095 U
0.097 Ua
0.076 Ja
0.10 U
0.00795 U
Pyrene
Mg/L
-
10 u
•10 u
0.1 u
0.24 U
0.24 U
0.24 U -
0.11 Ja
0.25 U
0.0216 U
2015-02-02 Dubuque-PNG Groundwater (10-14)
Alluvial Aquifer Wells
2/2/2015 56 of 77
dZ3 d~3 ILZ3 nm EZ^3 E—1 E—J C—: L—] C_J ! 2 ¦! i 3 : J L_
-------
GROUNDWATER ANALYTICAL RESULTS
MIDAMERICAN ENERGY COMPANY
PEOPLES NATURAL GAS SITE
DUBUQUE, IOWA
Sample Location: W-15
W-15
W-15
W-15
W-15
W-15
W-15
W-15
W-15
Screened Unit: Alluvial
Alluvial
Alluvial
Alluvial
Alluvial
Alluvial
Alluvial
Alluvial
Alluvial
Depth BTOC (feet): 53.0
53.0
53.0
53.0
53.0
53.0
53.0
53.0
53.0
Sample Date: 18-Apr-07
20-Sep-07
06-May-08
01-Oct-08
o>
o
1
Q.
<
i
CO
CM
16-Sep-09
31-Mar-10
15-Sep-10
27-Apr-11
Cleanup
Analyte
Units
Level
Benzene
MQ/L
5 . 1.00 U
1.00 u
1.00 u
1.00 u
1.00 u
1.00 u
1.00 u
1.00 u
1.00 u
Toluene
mq/I-
1,000 1.00 U
1.00 u
1.00 u
1.00 u
1.00 u
1.00 u
1.00 u
1.00 u
1.00 u
Ethylbenzene
m'q/l
700 1.00 U
1.00 u
1.00 u
1.00 u
1.00 u
1.00 u
1.00 u
1.00 u
1.00 u
Xylenes
MQ/L
10,000 3.00-U
' 3.00 U
3.00 U
3.00 U
3.00 U
3.00 U
6.00 U
3.00 U
3.00 U
2-Methylnaphthalene
mq/l
na
na
na
na
na
na
na
na
na
Dibenzofuran
pg/L
na
na
na
na
na
na
na
na
na
Acenaphthene
Mg/L
0.0544 U
0.0490 U
0.0490 U
0.0220 U
0.0220 U
0.0220 U
0.0220 U
0.0220 U
0.0220 U
Acenaphthylene
pg/L
• - 0.0944 U
0.0850 U
0.0850 U
0.0870 U
0.0870 U
0.0870 U
0.0870 U
0.0870 U
0.0870 U
Anthracene
|jg/i-
0.0111 U
0.0100 U
0.0100 U
0.0100 U
0.0100 U
0.0100 U
0.0100 U
0.0100 U
0.0100 U
Benzo(a)anthracene
pg/L
0.1 0.00333 U
0.00300 U
0.00300 U
0.00500 U
0.00500 U
0.00500 U
0.00500 U
0.00500 U
0.0200 U
Benzo(a)pyrene
pg/L
0.2 0.0356 U
0.0320 U
0.0320 U
0.00800 U
0.00800 U
0.00800 U
0.00800 U
0.00800 U
0.00800 U
Benzo(b)fluoranthene
Mg/L
0.1 0.0144 U
0.0130 U
0.0130 U
0.0280 U
0.0280 U
0.0280 U
0.0280 U
0.0280 U
0.0280 U
Benzo(g,h,i)perylene
Mg/L
0.0100 U
0.00900 U
0.00900 U
0.00800 U
0.00800 U
0.00800 U
0.00800 U
0.00800 U
0.00800 U
Benzo(k)fluoranthene
Mg/L
0.29 0.0167 U
0.0150 U
0.0150 U
0.00700 U
0.00700 U
0.00700 U
0.00700 U
0.00700 U
0.00700 U
Chrysene
mq/l
2^9 0.00556 U
0.00500 U
0.00500 U
0.00800 U
0.00800 U
0.00800 U
0.00800 U
0.00800 U
0.00800 U
Dibenzo(a,h)anthracene
pg/L
0.013 0.0111 U
0.0100 U
0.0100 U
0.0100 U
0.0100 U
0.0100 U
0.0100 U
0.0100 U
0.0100 U
Fluoranthene
pg/L
0.0111 U
0.0100 U
0.0100 U
0.0100 u
0.0100 u
0.0100 u
0.0100 u
0.0100 u ¦
0.0100 u
Fluorene
Mg/L
¦ -- 0.0111 U
0.0100 u
0.0100 u
0.0160 U
0.0160 U
0.0160 U
0.0160 U
0.0160 U
0.0160 U
lndeno(1,2,3cd)pyrene
Mg/L
0.1 0.00778 U
0.00700 U
0.00700 U
0.00600 U
0.00600 U
0.00600 U
0.00600 U
0.00600 U
0.00600 U
Naphthalene
Mg/L
0.14 0.0600 U
0.0540 U
0.0540 U
0.0460 U
0.0460 U
0.0460 U
R
0.0460 U
0.0460 U
Phenanthrene
Mg/L
0.00778 U
0.00700 U
0.00700 U
0.00500 U
0.00500 U
0.00500 U
0.00500 U
0:0379 J
0.00500 U
Pyrene
pg/L
0.0211 U
0.0190 U
o:oi?o u
0.0170 U
0.0170 U
0.0170 U
0.0170 U
0.0170 U
0.0170 U
2015-02-02 Dubuque-PNG Groundwater (10-14)
Alluvial Aquifer Wells
2/2/2015
57 of 77
-------
GROUNDWATER ANALYTICAL RESULTS
MIDAMERICAN ENERGY COMPANY
PEOPLES NATURAL GAS SITE
DUBUQUE, IOWA
Sample Location: W-15
W-15
W-15
W-15
W-15
W-15
W-15
W-20
W-20
Screened Unit: Alluvial
Alluvial
Alluvial
Alluvial
Alluvial
Alluvial
Alluvial
Alluvial
Alluvial
Depth BTOC (feet): 53.0
53.0
53.0
53.0
53.0
53.0
53.0
51.0
51.0
Sample Date: 20-Sep-11
25-Apr-12
25-Sep-12
30-Apr-13
04-Sep-13
25-Mar-14
21-Oct-14
29-Apr-09
16-Sep-09
Cleanup
Analyte
Units
Level
Benzene
(jg/L
5 1.00 U
1.00 u
1.00 u
0.50 U
0.500 U
0.500 U
0.500 U
1.00 u
8.71
Toluene
mq/l
1,000 1.00 U
1.00 u
1.00 u
1.00 U
1.00 U -
1.00 U
1.00 U
1.00 u
1.09
Ethylbenzene
pg/L
700 1.00 U
1.00 u
1.00 u
1.00 U
1.00 U
1.00U
1.00 U
1.00 u
17
Xylenes
Mg/L
10,000 3.00 U
3.00 U
3.00 U
3.00 U
3.00 U
3.00 U
3.00 U
3.00 U
3.54
2-Methylnaphthalene
pg/L
—
0.100 u
0.157 J
na
. na
na
0.100 U
na
na
Dibenzofuran
pg/L
—
na
na
na
na
na
na
na
na
Acenaphthene
pg/L
0.0220 U
0.0220 U
0.0220 U
- 0.208 U
0.0224 U
0.211 U
0.100 U
0.253
3.01
Acenaphthylene
pg/L
0.0870 U
0.0870 U
0.0870 U
<0.417
0.0888 U
0.421 U
0.100 U
0.0978 U
3.09
Anthracene
fjg/L
0.0100 U
0.0100 U
0. 036 J
0.104 U
0.0102 U
0.105 U
0.100 U
0.0220 J
0.0691 J
Benzo(a)anthracene
pg/L
0.1 0.0200 U
0.0200 U
0.0200 U
0.104 U
0.0204 U
0.105 U
0.100 U
0.00562 U
0.0249 J
Benzd(a)pyrene
Mg/L
0.2 0.00800 U
0.00800 U
0.00800 U
0.104 U
0.0286 U
0.105 U
0.100 U
0.0315 U
0.00889 U
Benzo(b)fluoranthene
Mg/i-
0.1 0.0280 U
0.0280 U
0.0280 U
0.104 U
0.00714 U
0.105 U
0.100 U
0.00787 U
0.031.1 U
Benzo(g,h,i)perylene
Mg/L
0.00800 U
0.00800 U
0.00800 U
0.208 U
0.00816 U
0.211 U
0.100 u
0.00899 U
0.00899 U.
Benzo(k)fluoranthene
ijg/L
0.29 0.00700 U
0.00700 U
0.00700 U
0.104 U
0.00816 U
0.105 U
0.100 u
0.00899 U .
0.00778 U
Chrysene
Mg/i-
2.9 0.00800 U
0.00800 U
0.0183 J
0.104 U
0.00816 U
0.105 U
0.100 u
0.00899 U
0.0174 J
Dibenzo(a,h)anthracene
pg/L
0.013 0.0100 U
0.0100 U
0.0100.U
0.104 U
0.0102 U
0.105 U
0.0170 U
0.0112 U
0.0111 U
Fluoranthene
Mg/L
0.0100. U
0.0100 u
0.0476 J
0.104 U
0.0102 U
0.105 U
0.100 u
0.0374 J
0.0805 J
Fluorene
Mg/L
0.0160 U
0.0160 U
0.0790 J
0.104 U
0.0163 U
0.105 U
0.100 u
0.223
2.66 M1
lndeno(1,2,3cd)pyrene
pg/L
0.1 0.00600 U
0.00600 U
0.00600 U
0.104 U
0.00612 U
0.105 U
0.100 u
0.00674 U
0.00667 U
Naphthalene
pg/L
0.14 0.0460 U
0.0460 U
0.416
0.265
0.0649 U
0.211 U
0.100 u
0.0517 U
0.916
Phenanthrene
pg/L
0.00500 U
0.00500 U
0.106
0.104 U
0.00510 U
0.105 U
0.100 u
0.00562 U
0.127
Pyrene
Mg/L
0.0170 U
0.0170 U
0.0350 J
0.104 U
0.0173 U
0.105 U
0.100 u
0.0191 U
0.075 J
2015-02-02 Dubuque-PNG Groundwater (10-14)
Alluvial Aquifer Wells
2/2/2015
C
CH3 EZZ3 ¦ EI=3
J] C_~
58 of 77
-------
CZI C~3 CUD EZ3 CZD CUD CZD C_U L_J ( 1 i J C_J I : [ ) L—J i : ) ! ; )
GROUNDWATER ANALYTICAL RESULTS
MIDAMERICAN ENERGY COMPANY
PEOPLES NATURAL GAS SITE
DUBUQUE, IOWA
Sample Location:
W-20
W-20
W-20
W-20
W-21
W-21
W-21
W-21
Screened Unit:
Alluvial
Alluvial
Alluvial
Alluvial
Alluvial
Alluvial
Alluvial
Alluvial
Depth BTOC (feet):
51.0
51.0
51.0
51.0
50.0
50.0
50.0
50.0
Sample Date:
31-Mar-10
05-May-10
14-Sep-10
27-Apr-11
26-Nov-96
22-Jan-97
29-May-97
25-Sep-97
Cleanup
Analyte
Units
Level
Benzene
MQ/L
5
1.00 u
na
1.00 u
1.00 u
67
1 U
71
2.3
Toluene
MQ/L
1,000
1.00 u
na
1.00 u
1.00 u
20 U
1 U
10 U
1 U
Ethylbenzene
pg/L
700
1.00 u
na
1.00 u
1.00 u
81
1.2
260
6.2
Xylenes
mq/l
10,000
6.00 U
na
3.00 U
3.00 U
na
na •
89
3.2
2-Methylnaphthalene
M9/L
— '
na
na
na
na
10U
10 U
10U
10 U
Dibenzofuran
' Mg/L
--
na
na
na
na
10U .
10U
10U
10U
Acenaphthene
(jg/L
—
0.407
2.43
1.91
2.72
10 U
10U
10 U
10 U
Acenaphthylene
Mg/L
--
0.0870 U
2:18
1.48
0.0870 U
10U
10 U
10 U
10 U
Anthracene
pg/L
—
0.0567 J
0.0447 J
0.0584 J
0.0904 J
10 U
10 U
10 U
10 U
B'enzo(a)anthracene
Mg/i
0.1
0.0216 J
0.00500 U
0.0123 J
0.043 J
10 U
10 U
10 U
10 U
Benzo(a)pyrene
pg/L
0.2
0.00800 U
0.00800 U
0.00800 U
0.0459 J
10 U
10 U
10 U
10 U
Benzo(b)fluoranthene
Hg/L
0.1
0.0280 U
0.0280 U
0.0280 U
0.0588 J
10 U
10 U
10 U
10U
Benzo(g,h,i)perylene
pg/L
-
0.00800 U
0.00800 U
0.00800 U
0.00800 U
10 U
10 U
10U
10 U
Benzo(k)fluoranthene
ijg/L
0.29
0.00700 U
0.00700 U
0.00700 U
0.0431 J
10 U
10U
10U
10 U
Chrysene
Mg/L
2.9
0.00800 U
0.00800 U
0.0376 J
0.0666 J
10 U
10U
10 U
10 U
Dibenzo(a,h)anthracene
pg/L
0.013
0.0100 U
0.0100 U
0.0100 U
0.0533 J
10 u
10 U
10 U
10 U
Fluoranthene
pg/L
0.0187 J
0.0100 U
0.0100 U
0.0693 J
10 u
10U
10 u
10U
Fluorene
pg/L
—
0.503
1.41
1.11
0.53
10 u
10 u
10 u
10 u
lndeno(1,2,3cd)pyrene
Mg/L
0.1
0.00600 U
0.00600 U
0.00600 U
0.0788 J
10 u
10U
10.u
10 u
Naphthalene
pg/L
0.14
R
0.183 J
• 0.13
0.318 B
10U
10U
10 u
2
Phenanthrene
pg/L
—
0.00500 U
0.00500 U
0.00500 U
0.0889 J
10U
10 u
10 u
10 u
Pyrene
Mg/L
0.0170 U
0.0170 U
0.0255 J
0.0170 U
10 u
10 u
10 u
10U
2015-02-02 Dubuque-PNG Groundwater (10-14)
Alluvial Aquifer Wells
2/2/2015
59 of 77
-------
GROUNDWATER ANALYTICAL RESULTS
MIDAMERICAN ENERGY COMPANY
PEOPLES NATURAL GAS SITE
DUBUQUE, IOWA
Sample Location:
W-21
W-21
W-21
W-21
W-21
W-21
W-21
W-21
W-21
Screened Unit:
Alluvial
Alluvial
Alluvial
Alluvial
Alluvial
Alluvial
Alluvial
Alluvial
Alluvial
Depth BTOC (feet):
50.0
50.0
50.0
50.0
50.0
50.0
50.0
50.0
50.0
Sample Date:
18-Dec-97
18-Dec-97
17-Mar-98
16-Jun-98
29-Sep-98
10-Dec-98
23-Mar-99
23-Jun-99
28-Sep-99
Cleanup
Analyte
Units
Level
Benzene
. pg/L
5
1 U
na
1 U
1 U
2
3
2.3
3.9
0.48
Toluene
pg/L
1,000
1 U
na
1 U
1 U
1 U
1 U
1 U
1 U
1 U
Ethylbenzene
pg/L
700
1 u
na
1 u
1 u
1 U
0.5
1 U
6.1
1 U
Xylenes
Pg/L
10,000
1 u
na
1 u
1 u
1 U
1 u
1 U
1.5
1 U
2-Methylnaphthalene
pg/L
~
10 u
10 U
10 u
10 u
10 U
10 U
10 U
10 U
10 U
Dibenzofuran
pg/L
—
10 u
10 U
10 u
10 u
10 U
10 U
10 U
10 U
10 U
Acenaphthene
pg/L
--
10 u
10 U
10 u
10 u
2
10 U
10 U
10 U
10 U
Acenaphthylene
i-jg/L
~
10U
10 U
10 u
10 u
10 U
10 U
10 U
10 U
10 U
Anthracene
pg/L
-
10 u
10 U
10 u
, 10 u
10 u
10 U
10 U
10 U
10 U
Benzo(a)anthracene
Mg/L
0.1
10 u
10 U
10 u
10 u
10 u
10 U
10 U
10 U
10 U
Benzo(a)pyrene
Mg/L
0.2
10 u
10 U
10 u
10 u
10 u
- 10 U
10 U
10 U
10 U
Benzo(b)fluoranthene
Mg/L
0.1
10 u
10 U
10 u
10 u
10 u
10 U
10 U
10 U
10 u
Benzo(g,h,i)perylene
pg/L
--
10 u
10 U
10 u
10 u
10 u
10 u
10 u
10 U
10 u
Benzo(k)fluoranthene
pg/L
0.29
10 u
10 U
10 u
10 u
10 u
10 u
10 u
10 u
10 u
Chrysene
pg/L
2.9
10 u
10 U
10 u
10 u
10 u
10 u
10 u
"10 u
10 u
Dibenzo(a,h)anthracene
pg/L
0.013
10 u
10 U
10 u
10 u
10 u
10 u
10 u
10 u
10 u
Fluoranthene
pg/L
—
10 U
. 10U"
10 u
10 u
10 u
10 u
10U
10 u
.10 u
Fluorene
pg/L
—
10 u
10 U
10 u
10 u
10 u
10 u
10 u
10 u
10 u
lndeno(1,2,3cd)pyrene
pg/L
0.1
10 u
10 u
10 u
10 u
10 u
10 u
10 u
10 u
10 u
Naphthalene
pg/L
0.14
10 u
10 u
10 u
10 u
10 u
10 u
10 u
10 u
10 u
Phenanthrene
pg/L
--
10 u
10 u
10 u
10 u
10 u
10 u
10 u
10 u
10 u
Pyrene
pg/L
--
10 u
10 u
10 u
10 u
10 u
10 u
10 u
10 u
10 u
2015-02-02 Dubuque-PNG Groundwater (10-14)
Alluvial Aquifer Wells
2/2/2015
60 of 77
-------
GROUNDWATER ANALYTICAL RESULTS
MIDAMERICAN ENERGY COMPANY
PEOPLES NATURAL GAS SITE
DUBUQUE, IOWA
Sample Location:
W-21
W-21
W-21
W-21
W-21
W-21
W-21
W-21
W-21
Screened Unit:
Alluvial
Alluvial
Alluvial
Alluvial
Alluvial
Alluvial
Alluvial
Alluvial
Alluvial
Depth BTOC (feet):
50.0
50.0
50.0
50.0
50.0
50.0
50.0
50.0
50.0
Sample Date:
15-Dec-99
15-Mar-00
06-Jun-oo
14-Sep-OO
14-Dec-00
21-Mar-01
07-Jun-01
20-Sep-01
12-Dec-01
Cleanup
Analyte
Units
Level
Benzene
pg/L
5
0:91
0.56
4.7
1 U
1 U
0.18 J
1 U
1 U
110
Tolue'ne-
pg/L
1,000
0.36
0.48
1.5
1 u
0.3 J
0.29 J
1 u
1 u
16 .
Ethylbenzene
pg/L
700
1.4
0.42
2.9
1 u
1 u
1 U
1 u
1 u
. 57
Xylenes
pg/L
10,000
0.89
0.64
2.6
1 u
0.5 J
0.21 J
1 u
1 u
77
2-Methylnaphthalene
pg/L
--
10 U
2.0 U
10 U
10 u
10 U
10U
10 u
10 u
10 U
Dibenzofuran
pg/L
—
10 U
na
10 U
10 u
10 U
10 U
10 u
10 u
10 U
Acenaphthene
pg/L
--
10 U
2.0 U
10 U
10 u
10U
10 U
10 u
10 u
0.6 J
Acenaphthylene
pg/L
10 U
2.0 U
10 U
10 u
10 U
10 U
10 u
10 u
0.85 J
Anthracene
pg/L
—
10 U
0.10 U
10 U
10 u
10U
10 U
10 u
10 u
10 U
Benzo(a)anthracene
mq/l
0.1
10 U
0.10 U
10 U
10U
10 U
10 U
10 u
10 u
10 U
Benzo(a)pyrene
pg/L
0.2
10 U
0.10 U
10U
10 u
10 U
10 U
10 u
10 u
10 U
Benzo(b)fluoranthene
. pg/L
0.1
10 U
0.10 U
10 U
10 u
10U
10 U
10 u
10 u
10 U
Benzo(g,h,i)perylene
. pg/L
—
10 U
0.20 U
10 U
10 u
10 u
10U
10 u
10 u
10 U
Benzo(k)fluoranthene
pg/L
0.29
10 U
0.10 U
10 U
10 u
10 u
10 U
10 u
10 u
10 U
Chrysene
pg/L
2.9
. 10U
0^10 U
10 U
10 u
10 u
10 u
10 u
10 u
10 U
Dibenzo(a,h)anthracene
pg/L
0.013
10 U
0.20 U
10 U
10 u
10 u
10 u
10 u
10 u
10 U
Fluoranthene
pg/L
—
10 U
0.029
10 u
10U
10U
10 u
10 u
10U
• 10 U
Fluorene
pg/i
10 u
0.048
10 u
10 u
10 u
10 u
10 u
10 u
10 U
lndeno(1,2,3cd)pyrene
pg/L
0.1
10U
0.20 U
10 u
10 u
10U
10 u
10 u
10U
10 U
Naphthalene
pg/L
0.14
4
2.0 U
2.
10 U:
10 u
10 u
10 u
10 u
270
Phenanthrene
pg/L
—
10 U
0.062
10 U
10 u
10 u
0.37 J
10 u
10 u
0^25 J
Pyrene
pg/L
—
10 U
' 0.023
10 u •
10U
10 u
10 U
10 u
10 u
10 U
2015-02-02 Dubuque-PNG Groundwater (10-14)
Alluvial Aquifer Wells
2/2/2015
61 of 77
-------
GROUNDWATER ANALYTICAL RESULTS
MIDAMERICAN ENERGY COMPANY
PEOPLES NATURAL GAS SITE
DUBUQUE, IOWA
Sample Location:
W-21
W-21
W-21
W-21
W-21
W-21
W-21
W-21
W-21R
Screened Unit:
Alluvial
Alluvial
Alluvial
Alluvial
Alluvial
Alluvial
Alluvial
Alluvial
Alluvial
Depth BTOC (feet):
50.0
50.0
50.0
50.0
50.0
50.0
50.0
5 0.0
49.5
Sample Date:
14-Mar-02
07-Jun-02
18-Sep-02
05-Dec-02
09-Jun-03
30-Mar-04
14-Sep-04
14-Mar-05 02-May-05
Cleanup
Analyte
Units
Level
Benzene
pg/L
5
42
35
3.7
3
2 U
1.4
44 .
66 ..
65
Toluene-
jjg/L
1,000
6.6
5.5
0.39 J
0.45 J
2 U
1.0 U
1.0 U
1.0 U
1.0 U
Ethylbenzene
mq/l
700
37
16
2.5
3.4
2 U
1.0 U
0.67 Ja
1.0 U
1.0 U
Xylenes
Mg/L
10,000
33
25
2.4
1.7
7 U
1.0U
1.0 U
1.0 U
1.0 U
2-Methylnaphthalene
pg/L
2.7 J
10 U
10 U
10 U
na
na
na
na
na
Dibenzofuran
pg/L
—
4.3. J
1.6 J
0.53 J
4.1 J
.na
na
na.
na
na
Acenaphthene
Mg/L
-
37
12
4.1 J
14
1.4
0.72 Ja
1.3Ja
0.92 Ja
12
Acenaphthylene
pg/L
-
26
8.6 J
1.8 J
5.1 J
0.28
1.2 Ja
11
3.1
30
Anthracene
pg/L
—
10 U
10 U
10 U
10 U
0.12
0.055
0.034 Ja
0.026 Ja
0.32
Benzo(a)anthracene.
pg/L
0.1
10 U
10 U
10 U
10U
0.1
0.3
0.10 Ja
0.13
0.12 U
Benzo(a)pyrene
pg/L
0.2
10 U
10 U
10U
10U
0.14
0.43
0.12 J
0.16
0.12 U
Benzo(b)fluoranthene
pg/L
0.1
10 U
10 U
10 U
10 U
0.14
0.52
0.17
0.23
0.046 U
Benzo(g,h,i)perylene
pg/L
-- .
10 U
10U
10 U
10 U
0.11
0.47
0.11 Ja
0.22 .
0.19 U
Benzo(k)fluoranthene
pg/L
0.29
10 U
'10 U
10 U
10 U
0.15
0.25
0.079
0.11
0.046 U
Chrysene
pg/L
2.9
10 U
10 U
10 U
10 U
0.15
0.4
0.14
0.17 M
0.12 U
Dibenzo(a,h)anthracene
pg/L
0.013
10 U
10 U
10 U
10 u
0.1 U
0.30 U
0.29 U
0.29 U
0.28 U
Fluoranthene
pg/L
< —
10 U
1.2 J
10 U
10 U
0.36
0.78
0.29
0.36
0.12 U
Fluorene
pg/L
4.4 J
1.6 J
10 U
3.0 J
0.29
0.15 Ja
0.13 Ja
0.068 Ja
6.1
lndeno(1,2,3cd)pyrene
p'g/L
0.1
10 U
10 U
10 U
.10 U
0.1
0.46
0.14
0:21
0.12 U
Naphthalene
pg/L
0.14
1300
260
10 u
7
0.15
1.3 Ua
0.61 Ja
1.3U
0.57 Ja
Phenanthrene
pg/L
—
10 U
0.81 J
10 u
10 U
0.21
0.32
0.13
0.13
0.030 Ja
Pyrene
pg/L
-
10 U
1,4 J
10U
10 u
0.27
0.6
0:20 Ja
0.28
0.23 U
2015-02-02 Dubuque-PNG Groundwater (10-14)
Alluvial Aquifer Wells
2/2/2015 62 of 77
CZZ3 CZZ3 CTJ £—~ EZZ) CZD CZJ CZZ2 L_: L_J [ ) L_J [__J [ ] L_j' ;
-------
CZZ3 cz: 'CUD
GROUNDWATER ANALYTICAL RESULTS
MIDAMERICAN ENERGY COMPANY
PEOPLES NATURAL GAS SITE
DUBUQUE, IOWA
Sample Location:
W-21R
W-21R
W-21R
W-21R
* W-21R
W-21R
W-21R
W-21R
Screened Unit:
Alluvial
Alluvial
Alluvial
Alluvial
Alluvial
Alluvial
Alluvial
Alluvial
Depth BTOC (feet):
49.5
49.5
49.5
49.5
49.5
49.5
49.5
49.5
- ¦
Sample Date:
10-Oct-05
14-Mar-06
11 -Sep-06
17-Apr-07
19-Sep-07
05-May-08
30-Sep-08
28-Apr-09
Cleanup
Analyte
Units
Level
Benzene
pg/L
5
23
3.2
5.57.
104
- 2.41
34.2
2.17
67.0
Toluene
jjg/L
1,000
1.0 U
1.0 U
1.00 U
1.00U.
1.00 U
1.00 U
1.00 U
1.00 U
Ethylbenzene
pg/L
700
1.0U
1.0 U
1.00 U
1.00 U
1.00 U .
1.00 U
1.00 U
1.00 U
Xylenes
pg/L
10,000
1.0U
1.0 U
3.00 U
3.00 U
3.00 U
3.00 U
3.00 U
3.00 U
2-Methylnaphthalene
pg/l
—
na
na
na
na
na
na
na
na
Dibenzofuran
pg/L
-
na
na
na
na
na
na
na
na
Acenaphthene
pg/L
. --
7,2
3.7
1.69
7.79
1.18
2.55
3.66 .
7.32
Acenaphthylene
mq/l
12
4.9
0.0850 U
1.78
0.0850 U
1.00
0.568
1.27
Anthracene
(jg/L
—
0.31 .
0.25
0.306
0.288
0.124 J
0.117 J
0.149 J
0.14800 J
Benzo(a)anthracene
pg/L
0.1
0.12 U
0.13 U
0.00300 U
0.00300 U
0.00300.U
0.00300 U
0.00500 U
0.00500 U
Benzo(a)pyrene
Mg/f-
0.2
0.12 U
0.13 U
0.0320 U
0.0320 U
0.0320 U .
0.0320 U
0.00800 U
0.00800 U
Benzo(b)fluoranthene
pg/L
0.1.
0.047 U
0.049 U
0.0130 U
0.0130 U
0.0130 U
0.0130 U
0.0280 U
0.02800 U
Benzo(g,h,i)perylene
pg/L
~
0.19 U
0.19 U
0.00900 U
0.00900 U
0.00900 U
0.00900 U
0.00800 U
0.00800 U
Benzo(k)fluoranthene
pg/L
0.29
0.047 U
0.049 U
0.0150 U
0.0150 U
0.0150 U
0.0150 U
0.00700 U
0.00700 U
Chrysene
pg/L
2.9
0.12 U
0.13 U
0.00500 U
0.00500 U
0.00500 U
0.00500 U
0.00800 U
0.00800 U
Dibenzo(a,h)anthracene
pg/L
0.013
. 0.28 U
0.29 U*
0:0100 U
0.0100 U
0.0100 U
0.0100 U
0.0100 U
0.0100 U
Fluoranthene
pg/L
0.12 U .
0.13 U
0.0243 J
0.0100 U
0.0100U
; 0.0100 U
0.0398 J
0.0631 J
Fluorene
pg/L
— . .
3.1
2.6
1.88
3.35
0.906
1.18
3.8
4.99
lndeno(1,2,3cd)pyrene
pg/L
0.1
0.12-U
0.13 U.
0.00700 U
0.00700 U
0.00700 U
0.00700 U
0.00600 U
0.00600. U
Naphthalene
pg/L
0.14
1.2 U
1.3 U
0.217
0.0540 U
0.119
0.438
0.417
0.04600 U
Phenanthrene
pg/L
—
0.094 U
0.097 U
0.0445 J
0.00700 U
0.0589 J
0.0589 J
0.0547 J
0.00500 U
Pyrene
pg/L
—
0.24 U
0.24 U
0.102 J
0.0190 U
0.0190 U '
0.0190 U
0.0170 U
0.0170 U
2015-02-02 Dubuque-PNG Groundwater (10-14)
Alluvial Aquifer Wells
2/2/2015.
63 of 77
-------
GROUNDWATER ANALYTICAL RESULTS
MIDAMERICAN ENERGY COMPANY
PEOPLES NATURAL GAS SITE
DUBUQUE, IOWA
Sample Location:
W-21R
W-21R
W-21R
W-21R
W-21R
W-21R
W-21R
W-21R
Screened Unit:
Alluvial
Alluvial
Alluvial
Alluvial
Alluvial
Alluvial
Alluvial
Alluvial
Depth BTOC (feet):
49.5
49.5
49.5
49.5
49.5
49.5
49.5
49.5
Sample Date:
15-Sep-09
30-Mar-10
05-May-10
15-Sep-10
27-Apr-11
19-Sep-11
25-Apr-12
24-Sep-12
Cleanup
Analyte
Units
Level
Benzene
pg/L
5
1.00 u
.206
na
2.84
1.00 u
28.5
22.8
57.3
Toluene
Pg/L
1,000
1.00 u
1.00 U
na
1.00 U
1.00 u
1.00 U
1.00 U
1.00 U
Ethylbenzene
pg/L
700
1:00 u
1.64
na
1.00 U
1.00 u
1.00 U
1.00 U
1.00 U
Xylenes
pg/L
10,000
3.00 U
6.00 U
na
3.00 U
. 3.00 U
3.00 U
3.00 U .
3.00 U
2-Methylnaphthalene
Mg/L
~
na
na.
na
na
na
na
0.100 U
.0.164 J
Dibenzofuran
pg/L
—
na
na
na
na
na
na
na
na
Acenaphthene
pg/L
~
2.82
16.1
0.979
1.34 ¦
0.2
0.0220 U
16.6
9.63
Acenaphthylene
pg/L
-
0.952
30.5
0.0870 U
0.0870 U
0.0870 U
0.0870 U
1.72
0.0870 U
Anthracene
pg/L
—
0.257
0.0100 U
0.0583 J
0.188 J
0.0324 J
0:204
0.115 J
0.154 J
Benzo(a)anthracene
pg/L
0.1
0.00500 U
0.00500 U
0.00500 U
0.00500 U
0.0200 U
0.0200 U
0.0200 U
0.0200 U
Benzo(a)pyrene
pg/L
0.2
0.00800 U
0.00800 U
0:00800 U
0.00800 U
0.00800 U
0.00800 U
0.00800 U
0.00800 U
Benzo(b)fluoranthene
pg/L
0.1
0.02800 U
0.0280 U
0.0280 U
0.0280 U
. 0.0280 U
0.0280 U
0.0280 U
0.0280 U
Benzo(g,h,i)perylene
pg/L
--
0.00800 U
0.00800 U
0.00800 U
0.00800 U
0.00800 U
0.00800 U
0.00800 U
0.00800 U
Benzo(k)fluoranthene
pg/L
0.29
0.00700 U
0.00700 U
0.00700 U
0.00700 U
0.00700 U
0.00700 U
0.00700 U
0.00700 U
Chrysene
pg/L
2.9
0.00800 U
0.00800 U
0.00800 U
0.00800 U
0.00800 U
0.00800 U
0.00800 U
0.0197 J
Dibenzo(a,h)anthracene
pg/L
0.013
0.0100 U
0.0100 U
0.0100 U
0.0100 U
0.0100 U
0.0100 U
0.0100 U
0.0100 U
Fluoranthene
pg/L
—
0.0526 J
•0.0100 U
0.0100 U
0:104 J
0.0100 U
0.133 J
0.0788 J
0.147 J
Fluorene
pg/L
—
1.91
0.0160 U
0.724
1.14
0.301
7.8
. 5.16
4.97
lndeno(1,2,3cd)pyrene
pg/L
0.1
0.00600 U
0.00600 U
o:oo600 u
0.00600 U
0.00600 U
0.00600 U
0.00600 U
0.00600 U
Naphthalene
pg/L
0.14
0.166
R
0.0460 U
0.0460 U
.0.0460 U
0.0460 U
0.0460 U
0.572
Phenanthrene
pg/L
—
0.00666 J
0.00500 U
0.00500 U
0.00500 U
0.00500 U
0.00500 U
0.00500 U
0.128
Pyrene
pg/L
— .
0.0170 U
0.0170 U
0.0170 U
0.0170 U
0.0170 U
0.0170 U
0.0170 U
0.0596 J
2015-02-02 Dubuque-PNG Groundwater (10-14)
Alluvial Aquifer Wells
2/2/20.15
64 of 77
-------
GROUNDWATER ANALYTICAL RESULTS
MIDAMERICAN ENERGY COMPANY
PEOPLES NATURAL GAS SITE
DUBUQUE, IOWA
Sample Location:
W-21R
W-21R
W-21R
W-21R
W-24
W-24
W-24
W-24
W-24
Screened Unit:
Alluvial
Alluvial
Alluvial
Alluvial
Alluvial
Alluvial
Alluvial
Alluvial
Alluvial
Depth BTOC (feet):
49.5
49.5
49.5
49.5
76.5
76.5
76.5
76.5
76.5
Sample Date:
30-Apr-13
04-Sep-13
25-Mar-14
21-Oct-14
29-Apr-09
16-Sep-09
31-Mar-10 06-May-10
14-Sep-10
Cleanup
Analyte
Units
Level
Benzene
M9/L
5
3.72
11.5
17.3
12.5
1.00 u
1.00 u
1.00 u
na
1.00 u
Toluene
mq/l
1,000
1.00 u •
1.00 U
1.00 U
1.00 U
1.00 u-
1.00 u
1.00 u
na
1.00 u
Ethylbenzene
mq/l
700
¦ 1.00 U
1.00 U
1.00 U
1.00 U
1.00 u
1.00 u
1.00 u
na
1.00 u
Xylenes
pg/L
10,000
3.00 U
3.00 U
: 3.00 U
3.00 U
3.00 U
3.00 U
6.00 U
na
3.00 U
2-Methylnaphthalene
pg/L
na
na
: na
0.100 U
na
na
. na
na
na
Dibenzofuran
pg/L
—
na
na
na
na
na
na
na
na
na
Acenaphthene
pg/L
—
11.2
0.145
13.4
17.3
0.0250 U
0.0220 U
0.0220 U
0.0220 U
0.0244 U
Acenaphthylene
pg/L
—
0.400 U
2.77
0.430 U
1.58
0,0989 U
0.0870 U
0.0870 U
0.0870 U
0.0967 U
Anthracene
pg'/L
—
0.163
0.158
0.108 U
0.108
0.0114 U
0.0100 U
0.0100 U
0.0100 U
0.01-11 U
Benzo(a)anthracene
pg/L
0.1
0.100 U
0.0222 U
0.108 U
0,100 U
0.00568 U
0.00500 U
0.00500 U
0.00500 U
0.00556 U
Benzo(a)pyrene
pg/L
0.2-'
0.100 U
0.0311 U
0.108 U
0.100 U
0.00909 U
0.00800 U
0.00800 U
0.00800 U
0.00889 U
Benzo(b)fluoranthene
pg/l
0.1
0.100 U
0.00778 U
0.108 U
0.100 U
0.0318 U
0.0280 U
0.0280 U
0.0280 U
0.0311 U
Benzo(g,h,i)perylene
pg/L
— ¦
0.200 U
0.00889 U
0.215 U
0.100 U
0.00909 U'
0.00800 U
0.00800 U
0.00800 U
0.00889 U
Benzo(k)fluoranthene
pg/L
0.29
0.100 U
0.00889 U
0.108 U
0.100 U
0.00795 U
0.00700 U
0.00700 U
0.00700 U
0.00778 U
Chrysene
pg/L
2.9
0.100 U
0.00889 U
0.108 U
0.100 U
0.00909 U
0.00800 U
0.00800 U
0.00800 U
0.00889 U
Dibenzo(a,h)anthracene.
pg/L
0.013
0.100 u
0.0111 U
0.108 U
0.0170 U
0.0114 U
0.0100 U
0.0100 U
0.0100 U
0.0111 U
Fluoranthene
pg/L
. ..
. 0.155
0.12
0.149
0.100 U
0.0114 U
0.0100 u
0.0100 u
0.0100 U
0.0111 U
Fluorene
--
3.03
5..17
4.04
2.38
0.0182 U
0.0160 U
0.0160 U
0.0160 U
0.0178 U
lndeno(1,2,3cd)pyrene
pg/L
0.1:;
0.100 U
0.00667 U
0.108 U
0.100 U
0.00682 U
0.00600 U
0.00600 U
0.00600 U
0.00667 U
Naphthalene
pg/L
0.14
0,200 U
9.05 J
0:215 U
0.100 U
0.0523 U
0.120
R
0.0460 U
0.05-11 U
Phenanthrene
pg/L
—
0.100 U
0.0914 J
0.108 U
0.100 U
0.00568 U
0.0117 J
0.00500 U
0.00500 U
0.00556 U
Pyrene"
pg/L
—
07100 U
0.063.
0.108 U
0.100 u
0.0193 U "
0.0170 U
0.0170 U
0.0170 U
0.0189 U
2015-02-02 Dubuque-PNG Groundwater (10-14)
Alluvial Aquifer Wells
2/2/2015
65 of 77
-------
GROUNDWATER ANALYTICAL RESULTS
MIDAMERICAN ENERGY COMPANY
PEOPLES NATURAL GAS SITE
DUBUQUE, IOWA
Sample Location:
W-24
W-24
W-24
W-24
W-24
W-24
W-24
W-27
W-27
Screened Unit:
Alluvial
Alluvial
Alluvial
Alluvial
Alluvial
Alluvial
Alluvial
Alluvial
Alluvial
Depth BTOC (feet):
76.5
76.5
76.5
76.5
76.5
76.5
76.5
49.7
49.7
Sample Date:
27-Apr-11
20-Sep-11
24-Apr-12
25-Sep-12
30-Apr-13
03-Sep-13
25-Mar-14
10-Oct-05
14-Mar-06
Cleanup
Analyte
Units Level
Benzene
M9/L
5
1.00 u
1.00 u
i:oou
1.00 u
0.500 U
0.500 U
0.500 U
1.0 u
1.0 U .
Toluene
Mg/L
1,000
1.00 u
1.00 u
1.00 u
1.00 u
1.00 U
1.00 U
•1.00 U
1.0 u
1.0 u
Ethylbenzene
pg/L
700
1.00 u
1.00 u
1.00 u
1.00 u
1.00 U
1.00 U
1.00 U
1.0 u
1.0 u
Xylenes
Mg/L
10,000
3.00 U
3.00 U
3.00 U
3.00 U
3.00 U
3.00 U
3.00 U
1.0 u
1.0 u
2-Methylnaphthalene
na
na
0.100 u
0.164 J
na
na
na
na
na
Dibenzofuran
Mg/L
--
na
na
na
na
na
na
na
na
na
Acenaphthene
pg/L
—
0.0220 U
0.0220 U
0.0220 U
0.0373 J
0.200 U
. 0.0224 U
0.206 U
2.5 U
2.5 U*
Acenaphthylene
mq/l
¦ —
0.0870 U
0.0870 U
0.0870 U
0.0870 U
0.400 U
0.0888 U
0.412 U
1.3 U
1.3 U*
Anthracene
yg/L
~
0.0100 U
0.0100 U
0.0100 U
0.0401 J
0.100 U
0.0102 U
0.103 U
0.051 U
0.049 U*
Benzo(a)anthracene
pg/L
0.1
0.0200 U
0.0200 U
0.0200 U
0.0219 J
0.100 U
0.0204 U
0.103 U
0.13 U
0.13 U
-Benzo(a)pyrene
pg/L
0.2
0.00800 U
0.00800 U
0.00800 U
0.016 J
0.100 U
0.0286 U
0:103 U
0.13 U
0.13 U
Benzo(b)fluoranthene
pg/L
0.1
0.0280 U
0.0280 U
0.0280 U
0.0280 U
0.100 U
0.00714 U
0.103 U
0.051 U
0.049 U
Benzo(g,h,i)perylene
pg/L
—
0.00800 U
0.00800 U
0.00800 U
0.00800 U
0.200 U
0.00816 U
0.206 U
0.20 U
0.20 U
Benzo(k)fluoranthene
. pg/L
0.29
0.00700 U
0.00700 U'
0.00700 U
0.00700 U
0.100 U
0.00816 U
0.103 U
0.051 U
0.049 U
Chrysene
ijg/L
2.9
0.00800 U
0.00800 U
0.00800 U
0.0272 J
0.100 u
0.00816 U
0.103 U
0.13 U
0.13 U
Dibenzo(a,h)anthracene
pg/L
0.013
0.0100 U
0.0100 U
0.0100 U
0.0100 U
0.100 u
0.0102 U
0.103 U
0.30 U
0.29 U
Fluoranthene
Mg/L
—
0.0100 u
0.0100.U
0.0100 u
0.0569 J
0.100 u
0.0102 U
0.103 U
0.13 U
0.13 U
Fluorene
Mg/L
—
0.0160 U
0.0160 U
0.0160 U
0.0879 J
0.100 u
0.0163 U
0.103 U
0.25 U
0.25 U*
lndeno(1,2,3cd)pyrene
Mg/L
0.1
0.00600 U
0.00600 U.
0.00600 U
0.00600 U
0.100 u
0.00612 U
0.103 U
0.13 U
0.13 U
Naphthalene
pg/L
0.14
0.215 B
0.0717 JB
0.0460 U
0.479
0.200 U
0.0469 U
0.206 U
1.3 U
1.3 U*
Phenanthrene
pg/L
~
0.00500 U
0.00500 U
0.00500 U
0.119
0.100 u
0.00510 U
0.103 U
0.10 U
0.098 U
Pyrene
pg/L
~
0.0170 U
0.0170 U
0.0170 U
0.041 J
0.100 u
0.0173 U
0.103 U
0.25 U
0.25 U
2015-02-02.Dubuque-PNG Groundwater (10-14)
Alluvial Aquifer Wells
2/2/2015
66 of 77
-------
GROUNDWATER ANALYTICAL RESULTS
MIDAMERICAN ENERGY COMPANY
PEOPLES NATURAL GAS SITE
DUBUQUE, IOWA
Sample Location:
W-27
W-27
W-27
W-27
W-27
W-27
W-27
W-27
W-27
Screened Unit:
Alluvial
Alluvial
Alluvial
Alluvial
Alluvial
Alluvial
Alluvial
Alluvial
Alluvial
Depth BTOC (feet):
49.7
49.7
49.7
49.7
49.7
49.7
49.7
49.7
49.7
Sample Date:
12-Sep-06
17-Apr-07
19-Sep-07
05-May-08
01-Oct-08
28-Apr-09
16-Sep-09
30-Mar-10
06-May-10
Cleanup
Arialyte
Units
Level
Benzene
M9/L
5
1.00 u
1.00 u
1.00 u
1.00 u
1.00 u
1.00 u
1.00 u
1.00 u
na
Toluene
MQ/L
1,000
1.00 u
1.00 u
1.00 u
1.00 u
1.00 U,L5
1.00 u
1.00 u
1.00 u
na
Ethylbenzene-
Mg/L
700
1.00 u
1.00 u
1.00 u
1.00 u
1.00 U
1.00 u
1.00 u
1.00 u
na
Xylenes
pg/L
10,000
3.00 U
3.00 U
3.00 U
3.00 U
3.00 U
3.00 U
3.00 U
6.00 U
na
2-Methylnaphthalene
Mg/L
—
na
na
na
na ¦
na
na
na
na
na
Dibenzofuran
Mg/L
-
na
na
na
na
na
na
na
na
na
Acenaphthene
[jg/L
—
0.0490 U
0.0490 U
0.0490 U
0.0490 U
0.0220 U
0.0220 U
0.0220 U
0.0220 U
0.0220 U
Acenaphthylene
Mg/L
—
0.0850 U
0.0850 U
0.0850 U
0.0850 U
0.0870 U
0.0870 U
0.0870 U
0.0870 U
0.0870 U
Anthracene
(jg/L
—
0.0100 U
0.0100 U
0.0100 U
0.0100 U
0.0100 U
0.0100 U
0.0100 U
0.0100 U
. 0.0100 U
Benzo(a)anthracene
pg/L
0.1
0.00300 U
0.00300 U
0.00300 U
0:00300 U
0.00500 U
0.00500 U
0.00500 U
0.00500 U
0.00500 U
Benzo(a)pyrene
M9/L
0.2
0.0320 U
0.0320 U
0.0320 U
0.0320 U
0.00800 U
0.00800 U
0.00800 U
0.00800 U
0.00800 U
Be'nzo(b)fluoranthene
pg/L
0.1
0.0130 U
0.0130 U
0.0130 U
0.0130 U
0.0280 U
0.0280 U
0.0280.U
0.0280 U
0.0280 U
Benzo(g,h,i)perylene
pg/L
—
0.00900 U
0.00900 U
0.00900 U
0.00900 U
0.00800 U
0.00800 U
0.00800 U
0.00800 U
0.00800 U
Benzo(k)fluoranthene
pg/L
0.29
0.0150 U
0.0150 U
0.0150 U
0.0150 U
0.00700 U
0.00700 U
0.00700 U
0.00700 U
0.00700 U
Chrysene
pg/L
2-9
0.00500 U
0.00500 U
0.00500 U
0.00500 U
0.00800 U
0.0.0800 U
0.00800 U
0.00800 U
0.00800 U
Dibenzo(a,h)anthracene
pg/L
0.013
0.0100 U
0.0100 U
0.0100 U
0.0100 U
0.0100 U
0.0100 U
0.0100 U
0.0100 U
0.0100 U
Fluoranthene
Mg/L
—
0.0100 U
0.0100 U
0.0100 U
0.0100 U
0.0100 u
0.0100 u
0.0100 U
0:0100 U
0.0100 u
Fluorene
pg/L
. — '•
0.0100 u
0.0100 u
0.0100 u
0.0100 u
0.0160 U
0.0160 U
0.0160 U
0.0160 U
0.0160 U
lndeno(1,2,3cd)pyrene
pg/L
0.1
0.00700 U
0.00700 U
0.00700 U
0.00700 U
0.00600 U
0.00600 U
0.00600 U
0.00600,U
0.00600 U
Naphthalene
pg/L
0.14:
0.0540 U
0.0540 U
0.0540 U
0.0540 U
0.0460 U
0.0460 U
0.0874 J
R
0.0460 U
Phenanthrene
pg/L
—
0.00956 J
0.00700 U
0.00700 U
0.00700 U
0.00500 U
0.00500 U
0.00500 U
0.00500 U
0.00500 U
Pyrene
pg/L
—
o:oi90.u
0.0190 U
0.0190 U
0.0190 U
0.0170 U
0.0170 U
0.0170 U
0.0170 U
'0.0170 U
2015-02-02 Dubuque-PNG Groundwater (10-14)
Alluvial Aquifer Wells
2/2/2015
67 of 77
-------
GROUNDWATER ANALYTICAL RESULTS
MIDAMERICAN ENERGY COMPANY
PEOPLES NATURAL GAS SITE
DUBUQUE, IOWA
Sample Location:
W-27
W-27
W-27
W-27
W-27
W-27
W-27
W-27
W-29
Screened Unit:
Alluvial
Alluvial
Alluvial
Alluvial
Alluvial
Alluvial
Alluvial
Alluvial ,
Aljuvial
Depth BTOC (feet):
49.7
49.7
49.7
49.7
49.7
49.7
49.7
49.7
62.6
Sample Date:
15-Sep-10
27-Apr-11
19-Sep-11
25-Apr-12
25-Sep-12
30-Apr-13
04-Sep-13
25-Mar-14
21-Oct-14
Cleanup
Analyte
Units
Level
Benzene
[jg/L
5
1.00 u
1.00 u
1.00 u
1.00 u.
1.00 u
0.50 U
0.500 U
0.500 U
0.500 U-
Toluene
Mg/L
1,000
1.00 u
1.00 u
1.00 u
1.00 u
1.00 u
1.00 U
1.00 U
1.00 U
1.00.U
Ethylbenzene
mq/l
700
1.00 u
1.00 u
1.00 u
1.00 u
1.00U
1.00 U
1.00 U
1.00 U
,1.00 U
Xylenes
pg/L
10,000
3.00 U
3.0.0 U
3.00 U
3.00 U
3.00 U
3.00 U
3.00 U
3.00 U
3.00 U
2-Methylnaphthalene
pg/L
«
na
na
na
0.100 u
0.360
na
na
na
0.100 U
Dibenzofuran
pg/L
--
na
na
na
na
na
na
na
na
na
Acenaphthene
mq/l
—
0.0220 U
0.0220 U
0.0220 U
0.0220 U
0.0939 J
0.206 U
0.0224 U
0.213 U
0.100 U
Acenaphthylene
Mg/L
~
0.0870 U,
0.0870 U
0.0870 U
0.0870 U
0.0870 U
0.412 U
0.0888 U
0.426 U
. 0.100 U
Anthracene
pg/L
—
0.0100 U
0.0100 U
0.0100 U
0.0100 U
0.0475 J
0.103 U
0.0102 U
0.106 U
0.100 U
Benzo(a)anthracene
pg/L
0.1
0.00500 U
0.0200 U
0.0200 U
0.0.200 U
0.0200 U
0.103 U
0.0204 U
0.106 U
0.100 U
Benzo(a)pyrene
Mg/L
0.2
0.00800 U
0.00800 U
0.00800 U
0.00800 U
0.00800 U
0.103 U
0.00816 U
0.106 U
0.100 U
Benzo(b)fluoranthene
pg/L
0.1
0.0280 U
0.0280 U
0.0280 U
0.0280 U
0.0280 U
0.103 U
0.0286 U
0.106 U
0.100 U
Benzo(g,h,i)perylene
pg/L
—
0.00800 U
0.00800 U
0.00800 U
0.00800 U
0.00800 U
0.206 U
0.00816 U
0.213 U
0.100 u
Benzo(k)fluoranthene
Mg/L
0.29
0.00700 U
0.00700 U
0.00700 U
0.00700 U
0.00700 U
0.103 U
0.0071 U
0.106 U
0.100 u
Chrysene
jjg/L
2.9
0.00800 U
0.00800 U
0.00800 U
0.00800 U
0.0216 J-
0.103 U
0.00816 U
0.106 U
0.100 u
Dibenzo(a,h)anthracene
mq/l
0.013
0.0100 U
0.0100 U
0.0100 U
0.0100 U
0.0100 U
0.103 U
0.0102 U
0.106 U
0.0170 U
Fluoranthene
pg/L
—
0.0100 u
0.0100 u
0.0100 u
0.0100 u
0.0621 J
0.103 U
0.0102 U
0.106 U
0.100 u
Fluorene
pg/L.
,
0.0160 U
0.0160 U
0.0160 U
0.0160 U
0.140 J
0.103 U
0.0163 U
0.106 U
0.100 u
lndeno(1,2,3cd)pyrene
MQ/L
•0.1
0.00600 U
0.00600 U
0.00600 U
0.00600 U
0.00600 U
0.103 U
0.00612 U
0.106 U
0.100 u
Naphthalene
Mg/L
0.14 .
0.0460 U
0.0460 U
0.189 B
0.0460 U
1.66
0.206 U
0.0469 U
0.26
0.100 u
Phenanthrene
Mg/L
—
0.00500 U
0.00500 U
0.00500 U
0.00500 U
0.160
0.103 U
0.00510 U
0.106 U
0.100 u
Pyrene
Mg/L
--
0.0170 U
0.0170 U
0.0170 U
0.0170 U
0.0452 J
0.103 U
0.0173 U
0.106 U
0.100 u
2015-02-02 Dubuque-PNG Groundwater (10-14)
Alluvial Aquifer Wells
2/2/2015 68 of 77
tZU EZD CH3 Cm L-J [ 3 C J L_J L—J t 3 L i ¦ ) ' 3 •! 3
-------
cm cm czm cm cm cm cm cm cm l
GROUNDWATER ANALYTICAL RESULTS
MIDAMERICAN ENERGY COMPANY
PEOPLES NATURAL GAS SITE
DUBUQUE, IOWA
Sample Location: W-30
Screened Unit: Alluvial
Depth BTOC (feet): 58.8
Sample Date: 21-Oct-14
Cleanup
Analyte Units Level
Benzene
mq/l
5
0.500 U
Toluene
Mg/L
1,000
¦ 1.00 u
Ethylbenzene
MQ/L
700
1.00 u
Xylenes
mq/l
10,000
3.00 U
2-Methylnaphthalene
mq/l
—
0.100 u
Dibenzofuran
|jg/i-
—¦
Acenaphthene
pg/L
. "
0.100 u
Acenaphthylene
Mg/L
-
0.100 u
Anthracene
pg/L
"
0.100 u
Benzo(a)anthracene
pg/L
0.1
0.100 u
Benzo(a)pyrene
pg/L
0.2
0.100 u
Benzo(b)fluoranthene
pg/L
0.1
0.100 u
Benzo(g,h,i)perylene
Mg/L
~
0.100 u
Benzo(k)fluoranthene
pg/i-
0.29
0.100 u
Chrysene
fjg/L
2.9
0.100 u
Dibenzo(a,h)anthracene.
pg/L'
0.013
0.0170 U
Fluoranthene
mq/l
—
0.100 u
Fluorene
pg/L
—
0.100 u
lndeno(1,2,3cd)pyrene
pg/L
0.1
0.100 u
Naphthalene
Mg/L
0.14
0.100 u
Phenanthrene
mq/l
-
0.100 u
Pyrene
Mg/L
--
0.100 u
2015-02-02 Dubuque-PNG Groundwater (10-14)
Alluvial Aquifer Wells
2/2/2015
69 of 77
-------
GROUNDWATER ANALYTICAL RESULTS
MIDAMERICAN ENERGY COMPANY
PEOPLES NATURAL GAS SITE
DUBUQUE, IOWA
Sample Location:
P-112
P-112
P-112
P-112
P-112
P-112
P-112
P-112
P-112
P-112
P-112
Screened Unit:
Silty Sand
Silty Sand
Silty Sand
Silty Sand
Silty Sand
Silty Sand
Silty Sand
Silty Sand
Silty Sand
Silty Sand
Silty Sand
Depth BTOC (feet):
38.8
38.8
38.8
38.8
38.8
38.8
38.8
38.8
38.8
38.8
38.8
Sample Date:
25-Apr-05
11-Oct-05
15-Mar-06
12-Sep-06
18-Apr-07
20-Sep-07
06-May-08
01-Oct-08
29-Apr-09
16-Sep-09
31-Mar-10
Analyte
Units
Cleanup Level
Alkalinity,Total as CaC03
mg/L
„
510
670
810
854
995
1090
1220
1200
1340
1290
1880
Ammonia(NH3+NH4), as N
mg/L
--
31
32
32
. 41.6
41.3
54.3
58.2
74.2
95.7 .
114
128
Chloride
mg/L
-
na
na
na
964 M1
na
na
na
na
na
na
na
Iron, Total
mg/L
-
na
95
120
122 MHA
137
101 MHA
65
94.7
78.8
68.8
64.6
Iron, Dissolved
mg/L
-
na
99
120
119MHA
125
98.8 MHA
100
89.5
86.2
71.8
70
Manganese, Total
mg/L
-
na
5.5
6.2
6.07
6.24
5.33 MHA
9.62
5.17
4.29 .
4.06
3.76
Manganese, Dissolved
mg/L
na
na
6.6
5.97
5.87
5.21
5.08
4.91
4.60
4.2
4.04
Methane
PS/L
-
2400
2900
2800
11600
16200
4600 M7
4200
8530
16500
10600
7170
Nitrate as N (N03-N)
mg/L
-
0.10 U
0.10 U
0.10 U
0.100 U M1
0.100 U
0.100 U M1
0.10 U
0.10 U
0.10 U
0.10 U
0.10 U
Nitrite as N (N02-N)
mg/L
-
0.020 U
0.020 U
0.020 U
0.100 U
0.100 U
0.100 U
0.100 U
0.100 U
0.100 U
0.100 U
0.100 U
Nitrogen, Total Kjeldahl as N
mg/L
--
27
30
32
34.2 M1
43.1
50.4 M1
61.8
58.1
93.6
113 M1
130
Phosphate, Ortho as P
mg/L
--
0.027 BA
0.050 U
0.016 B
0.100 U
0.100 U
1.00 U RL1
0.100 U
0.100 U
0.100 U
0.100 U
0.100 U
Sulfate
mg/L
-
9.3
15
5.0 U
15.9
12.2 M7
88.7
140
76.3
81.9
165
Sulfide
mg/L
-
2.3
6.3
6.8
1
1.55 pH<12
2.00 U .
2.00 U •
2.00 U
2.00 U
2.00 U
2.00 U pH<12
Total Organic Carbon
mg/L
12
' 18
18
16.6 M1
7.42 ET
7.22 ET.M1
7.66 ET
16.9 ET
26.7 ET
25.4
26.7 ET
Benzene
pg'L
5
49
29
270
286
285
369 M1 '
551
554
786
1280
1580
Toluene
P9'L
1,000
3.7
1.5
10 U
21.6
18.6
22.8 M1
11.2 L1
5.15
10.7
26.7
14.4
Ethylbenzene
MQ/L
700
91
57
500
715
536
585
789
671
890
831
1170
Xylenes
mq/l
10,000
75
29
- 220
734
232
279 M1
236 L1
556
235
277
117
Acenaphthene
pg/L
-
2.0 Ja
18
11
32.4
54.3 .
55.4
84.7
79.4
80.6
101
109
Acenaphthylene
pg/L
-
50
380
270
0.0850 U
0.0944 U
0.0850 U
0.0850 U
0.0870 U
0.0870 U
0.0870 U
1.74 U
Anthracene
pg/L.
-
0.050 U
0.24 U
0.051 U
0.0113
0.0721 J
0.136 J
0.217
0.125 J
0.160 J
0.265
0.0100 U
Benzo(a)anthracene
ug/L
0.1
0.13 U
0.62 U
0.13 U
0.00558
0.00333 U
0.00300 U
0.01 J
0.00500 U
0.00500 U
0.00500 U
0.00500 U
Benzo(a)pyrene
pg/L
0.2
0.13 U
0.62 U
0.13 U
0.0320 U
0.0356 U
0.0320 U
0.0320 U
0.00800 U
0.00800 U
0.00800 U
0.00800 U
Benzo(b)fluoranthene
pg/L
0.1
0.050 Ua
0.24 U
0.051 U
0.0130 U
0.0144 U
0.0130 U
0.0130 U
0.0280 U
0.0280 U
0.0280 U
0.0280 U
Benzo(g,h,i)perylene
pg/L
--
0.20 U
0.95 U
0.20 U
0.00900 U
0.0100 U
0.00900 U
0.00900 U
0.00800 U
0.00800 U
0.00800 U
0.00800 U
Benzo(k)fluoranthene
pg/L
0.29
0.050 U
0.24 U
0.051 U
0.0150 U
0.0167 U '
¦ 0.0150 U
0.0150 U
0.00700 U
0.00700 U
0.00700 U
0.00700 U
Chrysene
pg/L
2.9
0.13 U
0.62 U :
0.13 U
. 0.0338 J
0.00556 U
0.00500 U
0.00500 U
0.00800 U
0.00800 U
0.00800 U
0.00800 U
Dibenzo(a,h)anthracene
pg/L
0.013
0.30 U
1.4 U ¦
0.30 U*
' 0.0100 U
0.0111 U
0.0100 U
0.0100 U
0.0100 U
0.0100 U
0.0100 U
0.0100 U
Fluoranthene
pg/L
-
0.13 U
0.22 Ja
0.13 U
0.0100 U
• 0.0111 u
0.0100 U
0.0100 U
0.0100 U
0.0100 U
0.198
0.0100 U
Fluorene
pg/L
--
0.25 U
1.8
1.2
10.1
20.3
33.5
64.2
8.06
11.5
91.7
53
lndeno(1,2,3cd)pyrene
pg/L
0.1
0.13 U
0.62 U
0.13 U
0.00700 U
0.00778 U
0.007
0.00700 U
0.00600 U
0.00600 U
0.00600 U
0.00600 U
Naphthalene
pg/L
0.14
56
520
360
167
727 B
719
506
211
324
703
R
Phenanthrene
pg/L
--
0.099 Ua
0.48 U
0.10 U
0.544
2.4
1.65
2.95
2.17
2.63
3.52
0.100 U
Pyrene
pg/L
--
0.25 U
1.2 U
0.25 U
0.0190 U
0.0211 U
0.0190 U
0.0248 J
0.0170 U
0.0170 U
0.0170 U
0.0170 U
TPH as Gasoline
mg/L
-
na
na
.na
na
na
na
na
na
na
na
8.53
Diesel
pg/L
--
na
na
na
na
na
na
na
na
na
na
5340 N1,Q
Gasoline
pg/L
--
na
na
na
na
na
•na
na
na
na
na
13000 B.N1.Q
Motor Oil
pg/L
-
na
na
na
na
na
na
na
na
na
na
512N1.Q
Total Extractable Hydrocarbons (jg/L
-
na
na
na
na
na
na
na
na
na
na
18900
BOD - 5 Day
mg/L
~
na
na
na
na
na
na
na
na
na
na
16.4
Chemical Oxygen Demand
mg/L
-
. na
na
na •
na
na ¦
na
na
na
" na
na
75.7 M1
Phosphorous,Total
mg/L
-
na
na
na
na.
na
na
na
na
na
na
na
2015-02-02 Dubuque-PNG Groundwater (10-14)
MNA
5—315 c—q
f 5
EZZD CIZ3
cm
en
r n
L j C
j r_
r-
j r i
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> j Pag;
' -;f 77 r
-------
CZZ3 cm2 CZZD ZZZJ CZZ} CZZ3 CUD
GROUNDWATER ANALYTICAL RESULTS
MIDAMERICAN ENERGY COMPANY
PEOPLES NATURAL GAS SITE
DUBUQUE, IOWA
Sample Location:
P-112
P-112
P-112
P-112
P-112
P-112
P-112
P-112
P-112
P-112
W-117
Screened Unit:
Silty Sand
Silty Sand
Silty Sand
Silty Sand
Silty Sand
Silty Sand
Silty Sand
Silty Sand
Silty Sand
Silty Sand
Silty Sand
Depth BTOC (feet):
38.8
38.8
38.8
38.8
38.8
38.8
38.8
38.8
38.8
38.8
35.0
Sample Date:
06-May-10
14-Sep-10
28-Apr-11
20-Sep-11
25-Apr-12
25-Sep-12
01-May-13
05-Sep-13
26-Mar-14
22-Oct-14
27-Apr-05
Analyte
Units
Cleanup Level
Alkalinity,Total as CaC03
mg/L
__
na
1490
1160
1030
1260
1350
1400
1320 ¦
1370
878
650
Ammonia(NH3+NH4), as N
mg/L
. -
na
127
83.8
76.4
105
112
110
83.7
101
62.8
77
Chloride
mg/L
na
1080
' NA
na .
na
na
na
na
na
na
na
Iron, Total
mg/L
-
na
. 75.8
65
81
70.3
67.1
67.8
64.7
72.6
52.2
na
Iron, Dissolved
mg/L
na
59.1
62.7
65.1
64.7
67.6
62.2
54.7
72.1
51.6 .
na
Manganese, Total
mg/L
-
na
3.79
3.58
. 3.6
3.78
3.84
¦ 4.1
3.85
4.43
,2.28
na
Manganese. Dissolved
mg/L
-
na
3.28-
3.5
3.27 ¦
3.67
3.99
3.68
3.26 X
4.32
>2.24
na
Methane
Mg/L
-
na
¦6670
4300
2830
7730
4720
3020
2200
2950.
8580
1000
Nitrate as N (N03-N)
mg/L
-
na
0.10 U,H3,P2
0.10 U,P2
0.10 U
0.100 U,P2
0.100 U
. 0.100 U
0.100.U
0.100 U
0.100 U
0.10 U
Nitrite as N (N02-N).
¦ mg/L
na
0.100 U,H3
0.100 U
0.100 U
0.100 U
0.100 U
0.100 U
0.100 U
0.100 U
0.100 U
0.020 U
Nitrogen, Total Kjeldahl as N
mg/L
-
na •
114
86.4
72.1
96.1
119.
122
98.6
110
56.2
80
Phosphate, Ortho as P
mg/L
-
na
0.100 U,H3
0.100 U
0.100 U
0.100 U
0.100 U
na
0.100 U
0.100 U
0.100 U
0.015 B
Sulfate >
mg/L
- '
na
108 '
20.5
49.8
78.4
47.9
135
46.3
48.1
5.00 U
230
Sulfide
mg/L
¦ -
na
2.00 U,pH<12 2
.00 U,pH<12
2.00 U,pH<12 2.00 U,pH<12
2.00 U,pH<12
2.0 U
2.00 U
2.00 U
10.0 U
6.5
Total Organic Carbon
mg/L.
—
na
18.5 ET
6.65 ET
10.2 ET
19.1 ET
12.7
11.7.
7.86
23
7.14
7
Benzene
pg/L
5 .
na
1590
454
151
536
770
908
220
804
65.8
1.1
Toluene
Pg/L
1,000
na
24.8
5.89
1.0 U
9.47
14.4
5.87
5.00 U
10
0.100 U
1.0 U
Ethylbenzene
kig/L
.700
na
798
173
74.6
355
451
581
98.4
473
28.5
1.0 U
Xylenes
pg/L
10,000
na
276
155
70.9
87.7
147
75.6
19.2
70.2
16.1.
1.0 U
Acenaphthene
tjg/L
..
120 MHA
113
41.4 .
50.2 '
39.8
70.5
64.3
26.7
79.2
19.4
1.0 Ja
Acenaphthylene
pg/L
¦ -
0.870 U.MHA
0.435 U
0.0870 U
56.8
0.870 U
0.870 U
0.42.1 U
75.6
4.12 U
1.17
2.3
Anthracene
pg/L
-
0.192
0.432
0.126 J
0.0100 U
0.209
0.293
0.341
0.407
0.103
0.506
0.050 Ua
Benzo(a)anthracene
ug/L
0.1 ¦
0.00500 U
0.00500 U
0.0200 U
0.0.200 U.
0.0200 U
0.0200 U .
0.105 U
0.0208 U
0.103,
0.100 "u
0.13 U
Benzo(a)pyrene
pg/L
0.2
0.00800 U
0.00800 U
0.00800 U
0.00800 U
0.00800 U
0.00800 U
0.105 U
0.00833 U
0.103
0.100 U
0.13 U
Benzo(b)fluoranthene
ug/L
0.1
0.0280 U
0.0280 U
0.0280 U
0.0280 U
0.0280 U
0.0280 U
0.105 U
0.0292 U
0.103
0.100 U
0.050 U
Benzo(g,h,i)perylene
pg/L
-
0.00800 U
0.00800 U
0.00800 U
0.00800 U
0.00800 U
0.00800 U
0.211 U
0.00833 U
0.206 U
0.100 U
0.20 U
Benzo(k)fluoranthene
pg/L
0.29
0.00700 U
0.00700 U
0.00700 U
0.00700 U
0.00700 U ¦
0.00700 U
0.105 U
0.00729 U
0.103
0.100 U
0.050 U
Chrysene ¦
pg/L
2.9
0.00800 U
0.00800 U
0.00800 U
0.00800 U
0.00800 U
0.00800 U
0.105 U .
0.00833 U
0.103 ¦
0.100 U
0.13 U
Dibenzo(a,h)anthracene
pg/L
0.013
0.0100 U
0.0100 U
0.0100 U
0.0100 U
0.0100 U
0.0100 U
0.105 U
0.0104 U
0.103
0.0170 U
0.30 U
Fluoranthene.
pg/L
-
0.0100 U
0.0100 U
0.0100 U
0.0100 U
0.0100 U
0.0100 U
0.105 U
0.0104 U
0.103
0.100 U
0.13 U
Fluorene
pg/L
54 MHA
41.6
4.64
15.3
15.8
38.6
26.2
70.2
33.9
4.26
0.079 Ja
lndeno(1,2,3cd)pyrene
pg/L
0.1
¦ 0.00600 U
0.00600 U
0.00600 U
0.00600 U
0.00600 U
0.00600 U
0.105 U
0.00625 U
0.103
0.100 U
0.13 U
Naphthalene
pg/L
0.14 .
429 MHA
877
" 6.63
5.09 B
69.7
179
47.4
¦14.8
34.7
2.53
0.51 Ja
Phenanthrene ¦
pg/L
-
0.00500 U,M1
5.05
1.39
0.00500 U
2.67
5.90
4.33
3.39 ¦
5.38
2.32
0.052 Ja"
Pyrene
pg/L
-
0.0170 U
0.0170 U
0.0170 U
0.0170 U
0.0170 U
0.0170 U
0.105 U
0.0177 U
0.103
0.100 U
0.25 U
TPH as Gasoline
mg/L
-
na
na
na
na
na
na
na
na
na
na
na
Diesel
pg/L
-
na
na
•na
na
na
na
na ¦'
na
na
na
na ¦
Gasoline
pg/L
-¦
na .
na
na '
na
na
na
¦ na
na
na
. na
na
Motor Oil
pg/L
--
na
¦ na .
na
na
.. . na
na
¦. na.
na
na
na-.
na
Total Extractable Hydrocarbons
pg/L
-
na
na
na
¦ na
na
na
na
na
na
na
na
BOD - 5 Day
mg/L
-
na
na
na
na
na
na
na
na
na
na
' na
Chemical Oxygen Demand
mg/L
--
na
na
: na
na "
- na
na
na
na
na
¦ na
na
Phosphorous,Total
mg/L
-
1.75
na
_ na
na
na
na
na
na
na
na
na
2015-02-02 Dubuque-PNG Groundwater (10-14)
MNA
2/2/2015
Page 71 of 77
-------
GROUNDWATER ANALYTICAL RESULTS
MIDAMERICAN ENERGY COMPANY
PEOPLES NATURAL GAS SITE
DUBUQUE, IOWA
Sample Location:
W-117R
W-117R
W-117R
¦.W-117R
W-117R
W-117R
W-117R
W-117R
W-117R
W-117R
W-117R
Screened Unit:
Silty Sand
Silty Sand
Silty Sand
Silty Sand
Silty Sand
Silty Sand
Silty Sand
Silty Sand
Silty Sand
Silty Sand
Silty Sand
Depth BTOC (feet):
35.7
35.7
35.7
35.7
35.7
35.7
35.7
35.7
35.7
35.7
35.7
Sample Date:
11-Oct-05
15-Mar-06
12-Sep-06
18-Apr-07
20-Sep-07
06-May-08
01-Oct-08
29-Apr-09
16-Sep-09
31-Mar-10
06-May-10
. Analyte
Units
Cleanup Level
Alkalinity,Total as CaC03
mg/L
„
590
640
. 590
673
639
621
•615
572
653
837
na
Ammonia(NH3+NH4), as N
mg/L
38
23
25
27.3
28.7
17.5
32.9
30.6
47.7
39.7
na.
-Chloride -'
mg/L
-
na .
na
2160
na
na
na
na
na
na
na
na
Iron, Total
mg/L .
110
. 70
71.1
83.5 MHA
53.8
101
43:6
82.0
45.6
42.1
na
Iron, Dissolved
mg/L
-
43
46-
. 46.2
64.0 MHA.
46.9
63.1
42.4
88.2
43.6
42.7 S3
na
Manganese, Total
mg/L
-
9.4
8.6
8.04
9.47
6.81 ¦
5.09
5.95
12.7
6.62
6.50 MHA
na
Manganese, Dissolved
mg/L
-
na
8.5
7.26
9.05 MHA
6.7.
9.48
5.84
13.6
6.58
6.60 S3
na
Methane
pg/L
-
200
¦ 140
530
748
273
154
529
578,
997
823
na
Nitrate as N (N03-N)
mg/L
-
0.10 U
0.10 U
0.100 U
0.100 U
0.100 U
0.10 U
¦0.10 U
0.10 UP2
0.10 U
0.10 U,M1.
na
Nitriteas N (N02-N)
mg/L
-
0:020 u
0.020 U
0.100 U
0.100 U
0.100 U
0.100 U .
0.100 U
0.100 U '
0.100 U
. 0.100 U'
na
Nitrogen, Total Kjeldahl as N
mg/L
-
44
23
21.3
27 M1'
29.2
31.5
33.4
34.1 M1
43.5
39.4 M1
na
Phosphate, Ortho as P
mg/L
. .
. 0.050 U
0.016 B
0.100 U
0.108 M1
0.100 U
0.100 U
0.100 U
0.100 U
0.100 U
0.100 U
na
Sulfate' '
mg/L
-
v280
270
284
346
396
347
347
581
357
286
na
Sulfide
mg/L
. -
7.9
6.6
1
1.76
2.00 U
2.00 U
2.00 U
2.00 U
2.00 U
2.00 U pH<12
na
Total Organic Carbon
mg/L
15
14
8.88 .
2.93 ET,M1
2.86 ET
2.47 ET
7.79 ET
8.93 ET
16.7 ET
12.4 ET
na
Benzene
pg/L
5-
2:7
35
24.8
16.6
39.8
15.8
8.08
3.43
43 FM
27.1
na
Toluene
Mg/L
1,000
1.0 U
3.1
9
2.55
9.32
1.26
1.00 U
1.00 U
5.1 FM
1.00 U
ria
Ethylbenzene
pg/L
700
1.8
3.2
5.72
2.56
8.3
5.91
3.42 .
. 6.28
8.1 FM
4.91
na
Xylenes
pg/L
10,000
1.0 U
3.4 -
10.2
4.36
14.2
6.60
6.09
3.00 U
15.0 U FM
6.00 U
na
Acenaphthene?
pg/L
-
1.2 Ja
2.4 U
3.04
3.93
4.49
3.41
4.33
2.93
0.135 J
5.29
3.6
Acenaphthylene
pg/L
--
15
.15
4.95
7.51
11.5
6.44
16.3
9.31
0.0870 U
13.6
16.1
Anthracene
pg/L
-
0.029 Ja
0.049 Ua
0.0407 J
0.0495 J
0.075 J
0.0270 J
0.0100 U
0.0419 J
0.0276 J
0.0100 U
0.0100 U
Benzo(a)anthracene
ug/L
0.1
0.018 Ja
0.13 U
0.00341 U
0.00337 U
0.00300 U
0.00300 U
0.00500 U
0.00500 U
0.0506 J
0.00500 U
0.00500 U .
Benzo(a)pyrene
pg/L
0.2
0.025 Ja
0.13 U
0.0364 U
0.0360 U
0.0320 U
0.0320 U
0.00800 U
0.00800 U
0.0866 J
0.00800, U
0.00800 UN
° Benzo(b)fluoranthene
pg/L
0.1
0.025 Ja
0.049 Ua
0.0148 U
0.0146 U
0.0130 U
0.0130 U
0.0280 U
0.0280 U
0.0938 J
0.0280 U
0.0280 U
Benzo(g,h,i)perylene
pg'L
-
0.19 U
0.19 U
0.0102 U .
0.0101 U
0.00900 U
0.00900 U
0.00800 U
0.00800 U
0.085 J
0.00800 U
0.00800 U
Benzo(k)fluoranthene
pg/L
0.29
0.047 U
¦ 0.049 U
0.0170 U .
0.0169 U
0.0150 U
0.0150 U
0.00700 U
0.00700 U-
0.0586 J
0.00700 U
0.00700 U
Chrysene
pg/L
2.9
0.046 Ja
0.13 U
0.00568 U
0.00562 U
0.00500 U
0.00500 U
0.00800 U
0.00800 U
0.0745 J
0.00800 U
0.00800 U
Dibenzo(a,h)anthracene
pg/L
0.013
0.28 U
0.29 U*
0.0114 U
0.0112 U
0.0100 U
0.0100 U
0.0100 U
0.0100 U
0.0100 U
0.0100 U
0.0100 U
Fluoranthene
pg/L
-
0.068 Ja
0.13 U
0.0114 U
0.0112-U
0.0100 U
0.0100 U
0.0100 u •
0.0100 U
0.0732 J
0.0100 U
0.0100 u
Fluorene
pg/L
¦ -
1.2
1.1
1.52
2.23
2.82
1.7
3.06
1.76
0.0579 J
1.52
1.61
lndeno(1,2,3cd)pyrene
pg'L
0.1
0.12 U
0.13 U
0.00795 U
0.00787 U
0.00700 U
0.00700 U
0.00600 U
0.00600 U
0.0771 J
0.00600 U
0.00600 U
Naphthalene .
pg/L.
0.14
1.2 U
1.3 U
2.47
4.18 B
6.12
2^4
6.68
0.528
0.151
R
15
Phenanthrene
pg/L ¦
-
0.12
0.11 '
0.13
0.152
0.296
0.204
0.308
0.188
0.0784 J
. 0.00500 U
0.155
Pyrene
pg/L
--
0.23 U
0.24. U
0.0216 U
¦ 0.0213 U
0.0190 U
0.0190 U
0.0170 U
.0.0170 U
0.107 J
0.0170 U
0.0170 U
TPH as Gasoline
mg/L
-
na
na;
na
na
na
na
na
na
na
na
na
Diesel
pg/L
--
na
na
na
na
na .
na
na
na
na ¦
na
na
Gasoline
pg/L
„
na
na
na
¦ na
na
na
na
na
na
.na
na ;¦
Motor.'Oil
pg/L
¦ "
. na
. na
na
na
na
na
na
na
¦ na.
.na
na
Total Extractable Hydrocarbons pg/L
-
na
na
na
na
na
na
na
na
na
na
na
BOD - 5 Day
mg/L
--
na
na
na
na
na
na
na
na
na
na
na
Chemical Oxygen Demand
mg/L
--
na
na
na
na
na
na
na
na
na
na
na
Phosphorous,Total
mg/L
--
na
na
na .
na
na
na
na
na
na
na
na
2015-02-02 Dubuque-PNG Groundwater (10-14)
¦ y.
'
MNA
r~315 r—n
EH3
C3 EZ3
£~3
CZ-3
r i r - i r "i
. [_ ]
r • n
[ ;
r -| Pag£
-------
3 cms en cm czj cm c_j c_ ^ c i i i l
GROUNDWATER ANALYTICAL RESULTS
MIDAMERICAN ENERGY COMPANY
PEOPLES NATURAL GAS SITE
DUBUQUE, IOWA
Sample Location:
W-117R
W-117R
W-117R
W-117R
W-117R
W-117R
W-117R
W-117R
W-117R
D-6
D-6
Screened Unit:
Silty Sand
Silty Sand
Silty Sand
Silty Sand
Silty Sand
Silty Sand
Silty Sand
Silty Sand
Silty Sand
Silty Sand
Silty Sand
Depth BTOC (feet):
35.7
35.7
35.7
35.7
35.7
35.7
35.7
35.7
35.7
37.0
37.0
Sample Date:
16-Sep-10
28-Apr-11
20-Sep-11
25-Apr-12
25-Sep-12
Ot-May-13
05-Sep-13
26-Mar-14.
22-Oct-14
27-Apr-05
11 -Oct-05
Analyte
Unjts
Cleanup Level
Alkalinity,Total as CaC03
mg/L
...
656
748
666 M1
645
641
597
551
492
449
13.00
1200
Ammonia(NH3+NH4), as N
rhg/L
-
40.3
82.2
47.8
49.6
72.0
.54.5
55.3 '
.60.7
69.5-
110
120
Chloride*'
mg/L
--
2280
na
na
na
na
na
na
na
na
na
na
Iron, Total
mg/L
-
40.4
35
48 MHA
64.2 MHA
29.1
14.3
12.3
11.3
10.4
na
64
Iron, Dissolved
mg/L
39.0
33.2
43.3
56.3 MHA''.
32.3
14.2
11.0
8.66
9.08
na.
38
Manganese, Total
mg/L
»
5.95
5.85
6.47 MHA
'8.66
3.77
2.13
2.1
1.61
1.56 '
na
5.3
Manganese, Dissolved
mg/L
-
5.82
5.84
6.28
8.14
4.13
1.97
1.92
1.58
1.58
na
na
Methane
pg/L
-
608
740
561
629
1280
633
234
606
668
5100
2200
Nitrate as N.(N03-N)
mg/L
0.10 U
0.10 U,P2
0.10 U
0.100 U.M1.P2
0.100 U
0.100 U
0.100 U
0.100 U
0.100 U
0.10 U
0.1
Nitrite as N'(N02-N)
mg/L
-
0.100 U
0.100 U
0.100 U
0.100 U,M1
0.100 U
0.100 U
0.100 U
0.100 U
0.100 U
0.020 U
0.020 U
Nitrogen, Total Kjeldahl as N
mg/L
-
37.1
86.9
46.5 M1
45.9M1
67.4
58.1
64.5
62
67.8
130.
130
Phosphate, Ortho as P
mg/L
-
0.100 U
0.100 U
0.100 U,M1
0.100 U,M1
0.100 U
na
0.100 U
0.223
0.100 U
0.044 B
0.050 U
Sulfate
mg/L
-
366
308
400 M1
359
480
224
227
153
154
20
80
Sulfide
mg/L
-
2.00 U,pH<12
2.00 U,pH<12
2.00 U,pH<12
2.00 U,pH<12 2.00 U,pH<12
2.00 U
2.00 U
2.00 U
10.0 U
67
7.5
Total Organic Carbon
mg/L
--
7.19 ET
2.84
5.2 ET
8.85 ET.M1
5.47
11.5
4.62
13
4.68
35
36
Benzene
pg/L
5
31.5
1.00 U
1.88
2.13
65.2
6.54
2.54
7.68
0.93
610
990
Toluene
M9/L
1,000
1.6
1.00 U
1.00 U
1.00 U
. 1.00 U
1.34
1.00 U .
1.00 U
1.00 U
87
120
Ethylbenzene
pg/L
700
11.1
2.72
1.00 U '
2.03
1.00 U
1.25
1.00 U
. 1.00 U
1.00 U
620
730
Xylenes
pg/L
10,000
9.97
12.6
3.00. U
3.47
3.00 U
3.00 U
3.00 U
. 3.00 U
3.00 U
640
600
Acenaphthene
pg/L
-
0.164 J
4.89 RL1
3.04
1.7
3.57 .
7.55
8.94
. 9.44
11.1
690
88
Acenaphthylene
M9/L
-
0.0870 U
10.5 RL1
9.46
4.55
5.15
9.73
18.4
7.1
4.41
4300
1300
Anthracene
pg/L
-
. 0.0100 U
0.108 RL1,J
. 0.0602 J
0.0312 J
0.0710 J
0.119
0.123
0.102 U
0.100 U
290
20
Benzo(a)anthracene
ug/L
0.1
0.00500 U
0.0400 U.RL1
0.0200 U
0.0200 U
0.0200 U
0.104 U
0.0204 U
0.102 U
0.100 U
180
8.3
Benzo(a)pyrene
pg/L
0.2
0.00800 U
0.0160 U.RL1
0.00800 U
0.00800 U
0.00800 U
0.104 U
0.00816 U
0.102 U
0.100 U
110
5.2
Benzo(b)fluoranthene .
pg/L
0.1
0.0280 U
0.0560 U.RL1
0.0280 U
0.0280 U
0.0280 U
0.104 U
0.0286 U
0.102 U
0.100 U
• 55
2.7
Benzo(g,h,i)perylene
pg/L
-.
0.00800 U
0.0160 U.RL1
0.00800 U
0.00800 U
.0.00800 U
0.208 U
0.00816 U
0.204 U
0.100 u
37
1.8 Ja
Benzo(k)fluoranthene
pg/L
0.29
0.00700 U
0.0140 U,RL1
0.00700 U
0.00700 U
0.00700 U
0.104 U
0.00714 U
0.102 U .
0.100 u
35
1.1
Chrysene
pg/L
2.9
0.00800 U
0.0204 RL1.J
0.00800 U
0.00800 U
0.00800 U
0.104 U
0.00816 U
0.102 U
0.100 u
120.
5.5
"Dibenzo(a,h)anthracene
pg/L
0.013
0.0100 U
0.0200 U,RL1
0.0100 U
0.0100 U
0.0100 U
0.104 U
0.0102 U
0.102 U
0.0170 U
20
0.87 Ja
Fluoranthene
pg/L
-
0.0100 U
0.0318 RL1 ,J
0.0100 U
0.0100 U
0.0100 U
0.104 U
0.0102 U
0.355
0.100 u
810
42
Fluorene
pg/L
-
0.0160 U
0.0320 U.RL1
1.43
0.773
0.723
1.09
0.838
0.749
0:282
350
35
lndeno(1,2,3cd)pyrene
pg/L
0.1
0.00600 U
0.0120 U.RL1
0.00600 U
0.00600 U
0.00600 U
0.104 U
0.00612 U
0.102 U
0.100 U
47
2.2
Naphthalene
pg/L
0.1.4
0.0460 U
0.831 RL1
• 0.0460. U
0.0631 J
0.632
19.9
0.0469 U
1.73
0.145
4800
1200
Phenanthrene
pg/L
-
0.00500 U
0.0867 RL1.J
0.178
0.0917 J
0.0837 J
0.104 U
0.222
0.324
0.100 U
1200
74
Pyrene
pg/L
0.0335 J
0.0340 U.RL1
0.0170 U
0.0170 U
0.0171 J
0.104 U
0.0173 U
0.25
0.100 U
450 .
21
TPH as Gasoline
mg/L
n a
na
na
na
na
na
na
na
na
na
na
Diesel
pg/L
--
na
na
na
na
na
na'
na
na
na
na
na
Gasoline.
pg/L
na
na
na
na
na
na
¦ na
na
na
na
na
Motor'Oil
pg/L
vna
ria
na
na
na -
na
' na
na'
na
na
na
Total Extractable Hydrocarbons
pg/L
-
na
na
na
na
na.
na
na
na
na
na
na
BOD - 5 Day
mg/L
-
na.
na
na
na
na
na
na
na
. na
na
na
Chemical Oxygen Demand
mg/L
--
na
na
na
na
' na
na
na
na
na .
na
na
Phosphorous,Total
mg/L
-
na
na
na
na
na
na
na
na
na
na
na
2015-02-02 Dubuque-PNG Groundwater (10-14)
MNA
2/2/2015
Page 73 of 77
-------
GROUNDWATER ANALYTICAL RESULTS
MIDAMERICAN ENERGY COMPANY
PEOPLES NATURAL GAS SITE
DUBUQUE, IOWA
Sample Location:
D-6
D-6
D-6
D-6
D-6 "
D-6
D-6
D-6
D-6
D-6
D-6
Screened Unit:
Silty Sand
Silty Sand
Silty Sand
Silty Sand
Silty Sand
Silty Sand
Silty Sand
Silty Sand
Silty Sand
Silty Sand
Silty Sand
Depth BTOC (feet):
37.0
37.0
37.0
37.0
37.0
37.0
37.0
37.0
37.0
37.0
37.0
Sample Date:
15-Mar-06
12-Sep-06
18-Apr-07
09-Sep-07
06-May-08
15-Sep-09
31-Mar-10
06-May-10
16-Sep-10
28-Apr-11
20-Sep-11
¦Analyte
Units
Cleanup Level
Alkalinity,Total as CaC03
mg/L
1300 .
1490
"1820
1500
1840
1720
1630
na
1660
1420
1190
Ammonia(NH3+NH4), as N
mg/L
-
130
193 .
165
147
204
210
194
•na
' 199
198
118
Chloride
mg/L
-
na ¦
. .1390
na
na
na
na .
na
na
1640
na
na
Iron, Total
mg/L
-
66
68.2
31.0 pH>2
59.7
. .15.4
44.7
30
na
29.1 pH>2
59
90.2
Iron; Dissolved
mg/L
--
31
.. .49
9.45
45.6
15.2
22.7 pH>2
23.7
na
21.2
57.2
70.3
Manganese,Total "
mg/L
-
8.3
8.85
4.04 pH>2
¦6.74
9.62
8.9
5.53
na
¦ 6.74 pH>2
8.17
5.14
Manganese, Dissolved
mg/L
-
7.2
7.7
3.54
6.28
7.56
8.22 pH>2
6.25
na
6.08
8.17
4.89
Methane ¦
LJg/L
-
4000
7660
.10900
5790
2390
12500
11500
na
874.0
4200
7360
Nitrate as N.(N03-N)
mg/L
0.040 B
0.100 U .
0.100 U
0.100 U
0.10 U
0.10 U
0.10 U
na
0.10 U.
0.10 U,P2
0.10 U
Nitrite as N (N02-N)
mg/L
-
0.020 U
0.100 U
0.100 U
0.100 U
0.100 U
0.100 U
0.100 U
na
0.100 U
0.100 U
0.100 U
Nitrogen, Total Kjeldahl as N
mg/L
..
130
106
159 ¦
164
186
205
¦ 193
na
180
203
113
Phosphate, Ortho as P
mg/L
-
0.022 B
0.100 U
0.100 U
0.100 U
0.100 U
0.100 U
0.100 U
na
0.199
0.100 U
0.100 U
Sulfate
mg/L
¦ ..
50
30.2
13.8
196
122
222
63
. na
. 147
4.25
7.75
Sulfide
mg/L
~
11
2.4
5.5 pH<12
2.0 U
2.0 U
3.84
2.0 U pH<12
na
2.00 U,pH<12
2.00 U,pH<12
2.00 U,pH<12
Total.Organic Carbon
mg/L
-
35
28
26.9 ET
30.3 ET
32.6 ET
39.3 ET
36.2 ET
na
21.4 ET
8.14 ET
13.1 ET
Benzene
MQ/L
5
670
638
556
1220
' 1030
966
1470
na
1060
659
1600
Toluene
pg/L
. 1,000
33
24.4
22.3
159
25.8
49.2
49.6
na
44.8
39.5
219
Ethylbenzene
tjg/L
'700
620
635
. 582
795
948
870
882 C9
¦ . na
.737
424
709
Xylenes
ijg/L
10,000 ¦
340
253
222
564 MHA
253
1140
345 C9
na
356
230
713
Acena'phthene
M9'L
-
110
170
226
143
194
213
186
148
3.67
151
228
Acenaphthylene
MS'L
-
1400
46.4
0.0850 U
0.0850 U
0.0850 U
4.35 U
1.35 U
1.74 U
13.9
0.0870 U
225-
Anthracene
M9/L
-
20
52.2
54.6
19.4
37.9
33.6
29.7
14.8
0.0654 J
22.1
48.5
Benzo(a)anthracene
ug/L
0.1
9.6
21.9
22.9
8.0
¦18:5
13.4
14.5
4.83
0.00500 U
8.5
15.8
Benzo(a)pyrene
0.2
5.8
22
20.9
9.36
18.2
12.4
13.4
4.9
0.00800 U
6.6
13.8
Benzo(b)fluoranthene
M9'L
0.1
3.1
17.6
16.6
5.74
12.8.
7.56
0.0433 U
0.0280 U
0.0280 U
4.88
13
Benzo(g,h,i)perylene
M9/L
-
2.1
8.07
7.98
6.81
10
7.3
0.0124 U
2.38
. 0.00800 U
4.08
7.26
Benzo(k)fluoranthene
pg/L
0.29
1.3
7.07
7.24
2.83
6.44
4.54
0.0108 U
' 0.00700 U
0.00700 U
2.31
3.32
Chrysene
M9/L
2.9
6.2
24.8
18.6
8.74
17.7
10.1
0.124 U
2,47
0.00800 U
11.3
16.2
Dibenzo(a,h)anthracene
pg/L
0.013
0.88 Ja*
1.95
1.73
1.07
1.95
1.56
0.140 J
0.0100 U
0.0100 U
0.336
1.15
Fluoranthene
ijg/L
-
44
75.2
106
29.1
73.4
58.4
42.2
16
0.0100 U
20.1
61.1
Fluorene
M9/L
-
34
149
149
142
. 207
207
103
88.8
2.41
42.7
140
lhdeno(1,2,3cd)pyrene
pg/L
0.1
2.7
9.41
10
5.07
9.59
6.91
0.00928 U
1.98
0.00600 U
3.95
7.31
Naphthalene
MQ/t-
¦ 0..14 ¦
800
583
712 B
854
591
. ,659
R
616
10.2
538
2610 B
Phenanthrene
pg/L
-
77
170
181
86.3
158
153
120
53.2
0.226 ¦
71.2
163
Pyrene
pg/L
24
317
320
27
52.6
43.8
0.0263 U
2.95
0.0170 U
1.82
50.3
TPH as Gasoline
mg/L
..
na
na
na
na
na .
na
10
na
na
na
na
Diesel
pg/L -
-
na
na
• na
na
na
na ¦
15900 N1,Q
. . na
na
na '
na
Gasoline
P9/L
-
na
na
na .
na
na
na
22900 B,N1,Q
• na
na
na
na
Motor Oil !
P9'L
-
na ¦
na
na
na
na.
na .
2460 N1,Q
na
na
na
na
Total Extractable Hydrocarbons
M9'L
na
na
na
na
na
na
41300
na
na
na
na
BOD - 5 Day
mg/L
--
na
na
na
na
na
na
30.3
na
na
na
na
Chemical Oxygen Demand
mg/L
--
na
na
na./'
na
na
na
102 M1
na
na
na
na
Phosphorous,Total
mg/L
~
na
na
na
. na
. na-
na
102 M1
na
na
na
na
2015-02-02 Dubuque-PNG Groundwater (10-14)
MNA
CZ3 CZ3i5 C3 C3 f~l r—1 t ? f—> t—i r-~i r- i r i i 1 c. ; ~ j -w ; _jPaO'77 r-' ~! '
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CZJ dJ- d} CZ3 CZI3
i
GROUNDWATER ANALYTICAL RESULTS
MIDAMERICAN ENERGY COMPANY
PEOPLES NATURAL GAS SITE
DUBUQUE, IOWA
Sample Location:
D-6
D-6
D-6
D-6
D-6
D-6
SS-8
SS-8
SS-8
SS-8
Screened Unit:
Silty Sand
Silty Sand
Silty Sand
Silty Sand
Silty Sand
Silty Sand
Silty Sand
Silty Sand
Silty Sand
Silty Sand
Depth BTOC (feet):
37.0
37.0
37.0
37.0
37.0
37.0
33.4
33.4
33.4
33.4
Sample Date:
25-Apr-12
25-Sep-12
01-May-13
05-Sep-13
26-Mar-14
22-Oct-14
20-Sep-11
25-Apr-12
25-Sep-12
01-May-13
Analyte
Units
Cleanup Level
Alkalinity,Total as CaC03
mg/L
1410 "
1480
1150
1120
1390
1240
588
578
479 M1
548
Ammonia(NH3+NH4), as N
mg/L
-
189
' 184
173
127
167
185
21.6
24.3
36.5 "
26
Chloride
mg/L
¦ -
na
na
na
na
na
na
na
na
na
na
Iron, Total
mg/L
-
77
57.8
76.4
64.0
43.7
82.7
48.2
50.2
72.2 MHA
52.1
Iron, Dissolved
mg/L
-
60.6
44
52.3
58.1
. 40.7
65.4
42.5 .
44
67:4 MHA
53.8
Manganese, Total
mg/L
-
6.05
5.53
4.64
3.56
4.58
5.35
14.2
16.6
21.8 MHA
16.9
Manganese, Dissolved
mg/L
-
5.97
5.85
3.71
2.46
4.94
4.49
13.7
15
21.1 MHA
16.7
Methane
pg/L
-
9070
7420
7480
0.580 U
5610
7000
615
309
353
101
Nitrate as N (N03-N)
mg/L
-
0.100 U,P2
0.100 U
0.100 U
0.100 U
0.100 U
0.100 U
0.10 U
0.208 P2
0.100 U.M1.P2
0.100 U
Nitrite as N (N02-N)
mg/L
-
0.100 U
0.100 U
0.100 U
0.100 U
0.100 U
0.100 U
0.100 U
0.100 U
0.110
0.100 U
Nitrogen, Total Kjeldahl as N
mg/L
-
181
195
201
144
189
177
21.4
24.5
39.0 M1
28
Phosphate, Ortho as P
mg/L
-
0.100 U
0.100 U
na
0.100 U
0.100 U
0.100 U
0.100 U
0.100 U
0.100 U,M1
na
Sulfate
¦mg/L
-
5:00 U,RL1
30.0
25.1
5.00 U
6.67
5.00 U
145
161
144
234
Sulfide
mg/L
-
2.00 U,pH<12 2.00 U,pH<12
2.00 U
2.00 U
2.00 U
10.0 U
2.00 U,pH<12
2.00 U,pH<12
2.00 U,pH<12
2.00 U
Total Organic Carbon
mg/L
-
19.6 ET
11.4
20.5
10.8
24.8
. 18.8
'7.29 ET
7.26 ET
6.38 ET
3.73
Benzene
P9/L
5
892
1170
1620
1890
1540
986
7.93
1.95
1.00 U
0.50 U
Toluene
Pg/L
1,000
75.8
103
100
300
116 .
172
1.00 U
1.00 U
1.00 U
1.00 U
Ethyl benzene
pg/L
700
588
766
833
817
825
602
1.82
1.00 U
1.00 U
1.00 U
Xylenes
PS/L
10,000
385
500
518
880
585
544
3.00 U
3.00 U
3.00 U
3.00 U
Acenaphthene
M9/L
-
33.6
103
128
30.2
110
104 J-
1.96
0.145 J
0.0220 U
0.81
Acenaphthylene
pg/L
-
0.435 U
8.70 U
117
120
4.21 U
10.3 J-
0.0870 U
0.0870 U
0.0870 U
0.417 U
Anthracene
pg/L
-
11.8
25.1
21.8 .
4.71
5.45
5.98 J-
0.0286 J
0.0100 U
0.0100 U
0.104 U
Benzo(a)anthracene
ug/L .
0.1
4.58
11.8
7.5 ¦
2.16
0.554
2.35 J-
0.0200 U
0.0200 U
0.0200 U
0.104 U
Benzo(a)pyrene
M9/L
0,2
3.65
10.3
6.8
1.44
0.618
1.85 J-
0.00800 U
0.00800 U
0.00800 U
0.104 U
Benzo(b)fluoranthene
M9/L
. 0.1
3.12
5.77
4.34
3.48
0.525
2.28 J-
0.0280 U
0.0280 U
0.0280 U
0.104 U
Benzo(g,h,i)perylene
M9/L
-
1.92
5
3.31
1.73
0.221
0.816 J-
0.00800 U
0.00800 U
¦ 0.00800 U
0.208 U
Benzo(k)fluoranthene
M9/L
0.29
1.12
3.21
2.07
1.76
¦ 0.39
0.100 UJ
0.00700 U
0.00700 U
0.00700 U
0.104 U
Chrysene
M9/L
2.9
2.29
13.5
11.4
2.05
0.589
2.32 J-
0.00800 U
0.00800 U
0.00800 U
0.104 U
Dibenzo(a,h)anthracene
M9/L
0.013
0.31 J
0.821
0.58
1.33
0.105 U
0.264 J-
0.0100 U
0.0100 U
0.0100 U
0.104 U
Fluoranthene
M9/L
-
14.8
41.9
31.7
8.43
4.9
7.33 J-
0.0100 U
0.0100 u .
0.0100 u
0.104 U
Fluorene
pg/L'
-
25.2
86.6
77.8
42.7
54.1
33.0 J-
0.0160 U
0.0160 U
0.0160 U
0.104 U
lndeno(1,2,3cd)pyrene
pg/L
0.1
' 1.67
5.18
2.68
3.83
0.348
0.720 J-"
0.00600 U
0.00600 U
0.00600 U
0.104 U
Naphthalene
M9/L
0.14 ¦
264
990
1130
1130 -
946
1440 J-
2.53 B
¦ 0.26
0.146
0.208 U
Phenanthrene
pg/L
-
35.4
98.6
85.1
44.4
34
48.2 J-
0.00500 U
0.00500 U
0.00500 U
0.104 U
Pyrene
pg/L
8.07
• 31.8
28.1
3.5
3.75
8.41 J-
0.0234 J
0.0170 U
0.0170 U
0.104 U
TPH as Gasoline
mg/L
-
na
na
na .
na
. na
na
na
na
na
na
Diesel
pg/L
-
na
na
ha
na
na
na
ha
na
na
na
Gasoline
pg/L
-
na
na
na
na
na
na
na
na
na
. na
Motor Oil
pg/L
-
na •
na
na
na
na
na
na
na
na
na
Total Extractable Hydrocarbons
pg/L
-- ¦
na
na
na
na
na
na
na
na
na
na
BOD - 5 Day
mg/L
-
na
na
na
na
na
na
na
na
na
na
Chemical Oxygen Demand
mg/L
- ¦
na
na
na
. "na
na
na
na
na
na
na
Phosphorous,Total
mg/L
-
na
na
na
na
na
na ¦
na
na
na
na
2015-02-02 Dubuque-PNG Groundwater (10-14)
MNA
2/2/2015
Page 75 of 77
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GROUNDWATER ANALYTICAL RESULTS
MIDAMERICAN ENERGY COMPANY
PEOPLES NATURAL GAS SITE
DUBUQUE, IOWA
Sample Location:
SS-8
SS-8
SS-8
Screened Unit:
Silty Sand
Silty Sand
Silty Sane
Depth BTOC (feet):
33.4
33.4 .
33.4
Sample Date:
05-Sep-13
26-Mar-14
22-Oct-14
Analyte
Units
Cleanup Levei
Alkalinity,Total as CaC03
mg/L
648
424
597
Ammonia(NH3+NH4), as N
mg/L
--
16.8
23.4
18.9
Chloride
mg/L
-
na
na
na
Iron, Total
mg/L
-
41.2
58.2
50.8
Iron, Dissolved
mg/L
-
42.7
59.9
51.7
Manganese, Total
mg/L
-
13.2
19.7
13.9
Manganese, Dissolved
mg/L
-
' 12.7 X
20
.14.3
Methane
pg/L-
-
97.8
133
207
Nitrate as N (N03-N)
mg/L
-
0.100 U
0.100 U
0.100 U
Nitrite as N (N02-N)
mg/L
~
0.100 U
0.100 U
0.100 U
Nitrogen, Total Kjeldahl as N
mg/L
--
19.7
22.4
18.9
Phosphate, Ortho as P
mg/L
0.100 U
0.100 U
0.100 U
Sulfate
mg/L
--
144
183
114
Sulfide
mg/L
-
2.00 U
2.00 U
10.0 U
Total Organic Carbon
mg/L
--
4.80
2.95
4.76
Benzene
Mg/L
5
4.09
0.500 U
5.02
Toluene
pg/L ¦
1,000
1.00 U
1.00 U
1.00 U
Ethyl benzene
M3'L
700
1.00 U
1.00 U
1.00 U
Xylenes
M9'L
10,000
3.00 U
3.00 U
3.00 U
Acenaphthene
pg/L
0.0229 U
0.311
0.976
Acenaphthylene
pg/L
-
0.0906 U
0.412 U.
0.221
Anthracene
pg/L
-
0.0104 U
0.103 U
0.104 U
Benzo(a)anthracene
ug/L
¦0.1
0.0208 U
0.103 U
0.0521 U
Benzo(a)pyrene
pg/L
0.2
0.00833 U
0.103 U .
0.104 U
Benzo(b)fluoranthene
pg/L
0.1
0.0292 U
0.103 U
0.0521 U
Benzo(g,h,i)perylene
pg/L
-
0.00833 U
0.206 U.
0.104 U
Benzo(k)fluoranthene
pg/L
0.29 '
0.00729 U
0.103 U
0.104 U
Chrysene
pg/L
2.9
0.00833 U
0.103 U
0.104 U
Dibenzo(a,h)anthracene
pg/L
0.013
0.0104 U
0.103 U
0.0170 U
Fluoranthene
pg/L
-
0.0104 U
0.158
0.104 U
Fluorene
pg/L
~
0.0167 U
0.116
0.104 U
lndeno(1,2,3cd)pyrene
pg/L
0.1
0.00625 U
0.103 U .
0.0521 U
Naphthalene
pg/L
0.14
0.0479 U
.0.256
. 0.0726
Phenanthrene
pg/L
0.0511 U
0.125
0.104 U
Pyrene
pg/L
-
0.0177 U
0.178
0.104 U
TPH as Gasoline
mg/L
—
na
na
na
Diesel
pg/L
-
na
. na
' na
Gasoline
pg/L
-
na
.na
na
Motor Oil
pg/L
. -
na
na
na
Total Extractable Hydrocarbons
pg/L
-
na
na
na.
BOD - 5 Day
mg/L
..
na
na
na
Chemical Oxygen Demand
mg/L
-
na
na
na
Phosphorous,Total
mg/L
-
na
na
na
2015-02-02 Dubuque-PNG Groundwater (10-14)
MNA
-------
en cm cm
nzj ci3 izz;
r-
GROUNDWATER ANALYTICAL RESULTS
MIDAMERICAN ENERGY COMPANY
PEOPLES NATURAL GAS SITE
DUBUQUE, IOWA
Notes:
- = Cleanup Level not established.
BTOC = Below top of casing,
na = Not analyzed,
ns = Not sampled.
* = LCS, LCD, ELC, ELD, CV, MS, MSD, Surrogate: Batch QC exceeds the upper or lower control limits.
mg/L = Milligram(s) per liter.
|jg/l = Microgram(s) per liter.
a = Concentration is below the reporting limit.
B = Analyte was detected in the associated Method Blank.
C9 = Calibration Verification recovery was outside the method control limits for this analyte. The LCS for this analyte met CCV
acceptance criteria, and was used to validate the batch.
CIN = The % RSD for this compound was above 15%. The average % RSD for all compounds in the calibration met the 15%
criteria specified in EPA-methods 8260B/8270C.
ET = Matrix interference in sample is causing an endpoint timeout.
FM = Elevated detection limits due to sample foaming.
H = Sample analysis performed past method-specified holding time.
J = Estimated concentration below the reporting limit.
L1 = Laboratory Control Sample and/or Laboratory Control Sample Duplicate recovery was outside control limits.
L5 = Laboratory Control Sample was outside of acceptance Limits. The MS or MSD was used to validate the batch.
M1 = The MS and/or MSD were outside control limits.
MHA = Due to high levels of analyte in the sample, the MS/MSD calculation does not provide useful spike recovery information.
N1 = See case narrative.
P2 = Sample adjusted to method prescribed pH range prior to analysis.
pH<12 = Sample received at pH<12. It was adjusted correctly prior to analysis.
pH>2 = Sample received at pH>2. It was adjusted correctly prior to analysis.
P-HS = The sample container contained headspace.
Q = Poor chromatographic match to standard.
R = Sample result rejected; not usable.
RL1 = Reporting limit raised due to sample matrix effects.
S3 = Post digestion spike is out of acceptance limits for this analyte.
U = Analyte not detected at or above reporting limit.
ZX = Due to sample matrix effects, the surrogate recovery was outside the control limits.
2015-02-02 Dubuque-PNG Groundwater (10-14)
Notes
2/2/2015
77 of 77
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ATTACHMENT F
0 MWH
-------
ATTACHMENT F
QUALITY CONTROL SUMMARY REPORT
FOR THE
OCTOBER 2014 GROUNDWATER MONITORING EVENT
This Quality Control Summary Report summarizes the quality assurance and' quality control
(QA/QC) results for the samples collected and data generated during the Remedial Action (RA)
October 2014 groundwater monitoring event at the MidAmerican Energy Company
(MidAmerican) former manufactured gas plant site in Dubuque,¦ Iowa (site). Sample collection
and analyses were performed in accordance with the September 2014 Groundwater
Monitoring Plan (GMP) (MWH, 2014a) and the September 2014 Quality Assurance Project
Plan (QAPP) (MWH, 2014b) for the site, which were reviewed and approved by the United
States Environmental Protection Agency (USEPA), Region VII.
Twenty-four groundwater samples and associated QA/QC samples were collected and
analyzed by TestAmerica Laboratories, Inc. (TestAmerica) located in Cedar Falls, Iowa for the
following site groundwater constituents of concern (COCs):
¦ Benzene, toluene, ethylbenzene, and total xylenes (BTEX) by SW-846 8260C.
¦ Polycyclic aromatic hydrocarbons (PAHs) by SW-846 8270D selected ion
monitoring (SIM). ' ¦
Data quality was evaluated relative to the RA data quality objectives (DQOs), data quality
indicators (DQIs), and measurement quality objectives (MQOs). The DQOs are the qualitative
and quantitative statements developed in Section 3.1 of the QAPP that specify the quality of
data required to meet the remedial action objective and performance goal. The DQIs assess
data quality in quantitative and qualitative terms; include precision, accuracy,
representativeness, comparability, completeness, sensitivity, and traceability; and are
described in Section 3.2 of the QAPP. The MQOs are the control limits established for each
DQI and are listed in Tables 3-4 and 3-5 of the QAPP.
This data evaluation is presented in terms of these DQIs and is generally based on applicable
portions of the Contract Laboratory Program National Functional Guidelines for Organic
Review (USEPA, 2008), and the QC limits presented in the laboratory methodJspecific
standard operating procedures (SOPs), analytical reports, QAPP* and GMP. The analytical
data were reviewed, verified, and qualified based on results of the following QC parameters
and samples, where applicable:
¦ . Sample preservation.
¦ Sample hold times.
¦ Surrogate spikes. ' ¦ . '
¦ Laboratory control standards (LCSs) and laboratory control standard duplicates
(LCSDs).
¦ Matrix spike/matrix spike duplicate samples (MS/MSDs).
1
-------
¦ Field duplicate sample pairs.
¦ Trip blanks.
¦ Equipment blanks.
¦ Method blanks.
The following discussions describe how the data were validated for this project and identify
data that have associated QC results outside of acceptance criteria. Data qualified based on
results of the data validation are presented in Table 1. Data verification forms are included in
Exhibit 1.
3
1.0 COMPLETENESS EVALUATION
Completeness is a measure of the amount of valid data obtained from a measurement system
relative to the • amount of data scheduled for collection under correct, normal conditions.
Completeness measures the effectiveness of the overall investigation in collecting the required
samples, completing the required analyses, and producing valid results. Completeness was
calculated by dividing the number of acceptable sample results by the total number of
scheduled sample results.
1.1 Sampling Completeness
The field completeness goal for the number of samples collected compared to the number of
samples scheduled for collection is 90 percent (%). One monitoring well (W-27) which was
scheduled for sampling was discovered to have been destroyed by construction activities in
the area. Except as.noted, each sample was collected and analyzed as scheduled in the GMP
resulting in approximately 95% field completeness (23 samples collected out of 24 planned
samples).
1.2 Analytical Completeness
Analytical completeness was evaluated using the following equation:
„ , , Number of valid data points '
Completeness = — x 100
Total number of measurements
Where: The number of valid results is the total number of analytical measurements
considered usable (not rejected ["R" flagged]) based on the precision, accuracy, and
representativeness evaluations). -
The laboratory completeness goal for the number of acceptable sample results compared to
the total sample results is 90%. Only results qualified "R" (unusable) are hot considered
acceptable sample results for calculating laboratory completeness. Sample results with other
qualifiers are considered quantitative and acceptable. No analytes were qualified "R" as
unusable. Laboratory completeness was 100% for each anaiyte. Based on results of the data
verification described in the following paragraphs, all data are considered valid as qualified,
resulting in 100% analytical completeness for this project.
2
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2.0 REPRESENTATIVENESS EVALUATION
Representativeness is a qualitative expression of the degree to which sample data accurately
and precisely represent a characteristic of a population, a sampling point, or an environmental
condition. Representativeness is maximized by ensuring, for a given task, the number and
location of sampling points, and the sample collection and analysis techniques are appropriate
for the specific investigation; and the sampling and analysis program provides information
reflecting "true" site conditions.
Laboratory data were evaluated for representativeness by assessing compliance with specified
analytical criteria in the QAPP and laboratory SOPs; sample preservation and hold time
criteria; and field duplicate sample results.
2.1 GMP and QAPP Compliance
Groundwater samples were collected from, the locations and analyzed by the methods
specified in the GMP and QAPP, except as noted in Section 1.1.
2.2 Sample Preservation
Sample preservation is achieved by method-specific addition of chemical preservatives to
sample containers and/or maintaining method-specific sample temperatures. Sample
preservation is generally intended to retard biological action, retard hydrolysis, and reduce
sorption effects. Representativeness was evaluated in terms of the method-established
sample preservation acceptance criteria presented in the laboratory SOP. No samples were
found to be outside of pH control limits in the laboratory analytical reports. Sample receipt
information including sample integrity and temperature is included in the laboratory analytical
report. The internal temperatures measured in the sample coolers were between the 0 to
6 degree Celsius criteria. Each sample met the established sample preservation criteria.
2.3 Hold Time
Hold time reflects the length of time after sample collection thait a sample or extract remains
representative of environmental conditions. Depending on the analysis, either one or two hold
times were evaluated. For analyses that do not require sample extraction, only, one hold time
was evaluated (the length of time between sample collection and sample analysis). For
analyses that require sample extraction prior to analysis, two hold times were evaluated (the
length of time from sample collection to sample extraction and the length of time from sample
extraction to sample analysis). Data for samples that were extracted and analyzed within hold
time criteria are considered representative. Representativeness was evaluated in terms of the
method-established hold time control limits presented in the laboratory SOPs. For samples
that were extracted or analyzed outside of hold time! criteria, the sample data, are qualitatively
evaluated to determine the potential effect of the hold time exceesdance on sample
representativeness. Each sample met the established hold time.
3
-------
2.4 Field Duplicate Samples
For duplicate measurements, precision is expressed as the relative percent difference (RPD)
of the values and is calculated using the following.equation: '
RPD (%) = lD;-D2' X100
1/2(Di + D2)
Where: Dt = Concentration of analyte in the primary sample.
D2 = Concentration of analyte in the duplicate sample.
The RPD was calculated only for analytes that were detected above the method detection limit
in both the primary and duplicate samples. Groundwater field duplicate results should have an
RPD less than or equal to 25% when both the primary and duplicate sample results are greater
than or equal to five times the sample quantitation limit (QL); or less than or equal to 50%
when the primary and/or duplicate sample results are less than five times the QL, but greater
than the detection limit. The duplicate sample results are presented in Table 2. Data were not
qualified based on field duplicate RPD results.
3.0 ACCURACY EVALUATION
Accuracy is a measure of the bias of a method or the level' of agreement between a
measurement and a known true value. Laboratory accuracy was evaluated using the blank,
surrogate, LCS, and MS/MSD results.
3.1 Blanks
Target analytes should not be detected in blanks at concentrations above the
laboratory-established method reporting limits presented in the laboratory analytical report.
3.1.1 Trip Blanks. A trip blank accompanied each cooler containing samples for BTEX
analyses and was analyzed to assess whether cross contamination of the samples occurred
from sample containers or other samples during transport to and at the laboratory. Each trip
blank consisted of a set of volatile organic compound (VOC) sample vials that had been filled
by the laboratory with orga!nic-free water and accompanied the empty sample containers to the
site. The trip blanks remained unopened during the sampling activities. Results of the trip
blank analyses are presented in the laboratory analytical reports. . Each trip blank met the
established criteria.
3.1.2 Method Blanks, the method blank contains each of the reagents used in the
processing of samples and is carried through the complete analytical procedure used for the
samples. Results of the method blank analyses are presented in the laboratory analytical
reports. Each method blank met the established criteria.
3.1.3 Equipment Blanks. Dedicated equipment was used to collect each groundwater
sample; therefore equipment blanks were not scheduled for collection and analysis.
4
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3.2 Surrogate Spikes
Surrogate spike recoveries were used to evaluate the accuracy of the analytical data and to
monitor laboratory control procedures for organic analyses. Samples were spiked with
surrogates according to the laboratory SOP. The surrogate spike percent recovery (%R) data
were evaluated using the laboratory-established control limits presented in the laboratory
analytical report. %R is calculated using the following equation:
|A - B|
%R = -x100%
C
Where: A = The measured concentration of the spiked analyte in a spiked sample.
B ;= The measured concentration of the spiked analyte in an unspiked sample. .
C = The concentration of the analyte used for spiking.
The surrogate spike results are presented in the laboratory analytical reports with the sample
data. Data qualified based on surrogate spike results are presented in Table 1.
3.3 LCSs
LCSs were analyzed to assess accuracy in the absence of matrix effects. Reagent grade
water was spiked with target analytes prior to analysis. The %R of the spiked compounds was
compared to the laboratory-established control limits presented in the laboratory, analytical
report. LCS results are presented in the laboratory analytical reports. The LCS recoveries met
the established criteria.
3.4 MS/MSD Samples
MS/MSD samples were analyzed to assess accuracy and to identify possible adverse matrix
effects. These samples,, were spiked with target analytes prior to extraction or analysis. The
%R of the spiked compounds was compared to the laboratory-established control limits
presented in the laboratory analytical report. MS/MSD results are presented in the laboratory
analytical reports. Data qualified based on MS/MSD recoveries are presented in Table 1.
4.0. PRECISION EVALUATION
Precision measures the reproducibility of measurements under a given set of conditions, and is
expressed as RPD. Laboratory precision was evaluated u£ing the RPDs between the
MS/MSD samples and field duplicate samples. The following, criteria were used to evaluate
precision, where applicable.
5
-------
4.1 MS/MS Ds
MS/MSD samples are scheduled to be collected at a frequency of 1 field duplicate per 20
investigative samples of the same matrix. MS/MSD sample pairs were collected from 2 of the
24 sampled monitoring wells (W-13 and SS-8) and, therefore, met the established frequency
criteria.
MS/MSD sample pairs were analyzed to assess precision. These samples are spiked with
target analytes prior to extraction or analysis. The RPDs of the spiked compounds were
compared to the laboratory-established control limits presented in the laboratory analytical
report. MS/MSD results are presented in the laboratory analytical reports. Only the parent
sample results are qualified based on MS/MSD results. Data are not qualified if the parent
sample results are greater than four times the spike concentration. MS/MSD. RPD results met
the established criteria.
4.2 Field Duplicates
Field duplicate samples are scheduled to be collected at a frequency of 1 field duplicate per
15 investigative samples of the same matrix. Duplicate samples were collected from 2 of the
24 sampled monitoring wells (W-113 and W-117R) and, therefore, met the established
frequency criteria.
The RPD was calculated only for analytes that were detected above the method detection limit
(MDL) in both the primary and duplicate samples. Groundwater field duplicate results should
have an RPD less than or equal to 25% when both the primary and duplicate sample results
are greater than or equal to five times the QL; or less than or equal to 50% when the primary
and/or duplicate sample results are less than five times the QL but greater than the detection
limit. The duplicate sample results are presented in Table 2. Data were not qualified based on
field duplicate RPD results.
5.0 COMPARABILITY EVALUATION
Comparability is a qualitative parameter that expresses the confidence that one data set may
be compared to another. For this project, sample collection and analysis followed standard
methods and the data were reported using standard units of measure. As a result, the data
from this project are considered comparable to other data collected at this site using similar
sample collection and analysis methodology.
6.0 SENSITIVITY EVALUATION
Sensitivity is the capability of a method or instrument to discriminate among measurement
responses representing different levels of the variable of interest. Sensitivity was evaluated by
comparing analyte method reporting limits (MRLs), or in the case of dibenzo(a,h)anthracene,
the MDL, with corresponding RA performance standards. In samples not requiring dilutions,
adequate sensitivity was demonstrated with MRLs (or MDLs) equal to or less than the analyte
6
-------
performance standards for each COC concentration reported as less than the MRL (or MDL),
with the exception of one or more PAHs in the following samples: W-113-GW-1014, SE-4-
GW-1014, SE-5-GW-1014, SS-8-GW-1014, and DP-01-GW-1014. The elevated PAH MRLs
for these samples were a result of the initial sample volume extracted during sample
preparation and an updated laboratory information management system (LIMS). The previous
LIMS allowed a 5% margin between the base sample volume needed for the method (1,000
milliliters) and the volume extracted before correcting the MRLs. The current LIMS corrects for
sample volume without a margin, which can result in slightly elevated MRLs for PAHs. For
future groundwater monitoring events, TestAmerica will report benzo(a)anthracene,
benzo(b)fluoranthene, and indeno(1,2,3-cd) pyrene to the MDL to meet the respective RA
performance standards in undiluted samples (if necessary).
7.0 TRACEABILITY EVALUATION
Traceability is the extent to which data can be substantiated through documentation.
Traceability was evaluated by reviewing field documentation, chain-of-custody documentation,
and analytical reports. Each sample was found to be traceable from collection through
analysis.
8.0 CONCLUSIONS
Based on the evaluated data completeness, representativeness, accuracy, precision,
comparability, sensitivity, and traceability, the October 2014 groundwater data are considered
usable as reported and qualified for the purposes of the RA.
9.0 REFERENCES
MWH, 2014a. Groundwater Monitoring Plan, Peoples Natural Gas Site, Dubuque, Iowa.
September 2014.
MWH, 2014b. Quality Assurance Project Plan. Peoples Natural Gas Site, Dubuque, Iowa.
September 2014.
USEPA, 2008. Contract Laboratory Program National Functional Guidelines for Organic Data
Review. USEPA-540-R-08-01, June 2008.
/kga:vas
P:\Word Processing\MIDAMERICAN ENERGY\DUBUQUE-PNG SITE\02-2015_ANNUAL REPORT (CY 2014)\ATTACHMENT B\2015-01-PNG
Dubuque QCSR (Oct. 2014 Groundwater).doc
7
-------
EZZ3 ZZD CD
CU (HI!
TABLE 1
QUALITY CONTROL PARAMETERS OUTSIDE OF CONTROL LIMITS RESULTING IN QUALIFIED DATA
Laboratory
Work Order
Preparation
Batch
QC Sample/
Analytical Batch Parameter Control Limits
Result
Analyte(s)
Sample(s) Affected
Qualifier
Qualifier Applied To
Qualified
Sample
Result
310-42101-10
65793
66909 MS/MSD %R
-------
TABLE 1
QUALITY CONTROL PARAMETERS OUTSIDE OF CONTROL LIMITS RESULTING IN QUALIFIED DATA
Qualified
Laboratory Preparation QC Sample/ ~ Sample
Work Order Batch Analytical Batch Parameter Control Limits Result Analyte(s) Sample(s) Affected Qualifier Qualifier Applied To Result
Notes:
< = Less than.
LCL = Lower control limit.
J- = The analyte was positively identified; the quantitation is an estimation with a potential low bias.
MS = Matrix spike.
MSD = Matrix spike duplicate.
QC = Quality control.
%R = Percent recovery.
UJ = The analyte was analyzed for, but not detected. .Due to a QC deficiency identified during data verification, the value reported may not accurately reflect the sample quantitation limit.
J
Page 2 of 2
I i i "I
cm cz] c:
-------
J EZZ3 czn
cm czd
TABLE 2
FIELD DUPLICATE SAMPLE RESULTS
Sample Identification:
Sample Date:
Sample Type:
W-113-GW-1014
10/21/14
Primary
DP-01-GW-1014
10/21/14
Duplicate
W-117R-GW-1014
10/22/14
Primary
DP-02-GW-1014
10/22/14
Duplicate
Analytical Parameters
Units
RPD
RPD
Benzene
pg/L
<0.500
<0.500
NA
0.930
1.05
12%
Ethylbenzene
pg/L
<1.00
<1.00
NA
<1.00
<1.00
NA
Toluene
jjg/L
<3.00
<3.00
NA
<1.00
<1.00 '
NA
Xylenes, total
Pg/L
<3.00
<3.00
NA
<3.00
<3.00
NA
Acenaphthene
pg/L
<0.105
<0.102
NA
11.1
10.5
6%
Acenaphthylene
pg/L
<0.105
- <0.102
NA
4.41
6.14
33%
Anthracene
pg/L
<0.105
<0.102
NA
<0.100
<0.100
NA
Benzo (a) anthracene
pg/L
<0.0526
<0.0510
NA
<0.100
<0.100
NA
Benzo (b) fluoranthene
pg/L
<0.0526
<0.0510
NA
'<0.100
<0.100
NA
Benzo (k) fluoranthene
pg/L
<0.105
<0.102
NA
<0.100
<0.100
NA
'Benzo (a) pyrene
pg/L
<0.105
<0.102
NA
<0.100
<0.100
NA
Benzo (g,h,i) perylene
pg/L
<0.105
<0.102
NA
<0.100
<0.100
NA
Chrysene
pg/L
<0.105
<0.102
NA
<0.100
<0.100
NA
Dibenzo (a,h) anthracene
pg/L
<0.0179
<0.0173
NA
. <0.0170
<0.0170
NA
Fluoranthene
pg/L
<0.105
<0.102
NA
<1.00
<1.00
NA
Fluorene
pg/L
<0.105
<0.102
NA
0.282
0.316
11%
Indeno (1,2,3-cd) pyrene
pg/L
<0.0526
<0.0510
NA
<0.100
<0.100
NA
2-Methylnaphthalene
pg/L
<0.105
<0.102
NA
<0.100
<0.100
NA
Naphthalene
pg/L
<0.0526
<0.0510
NA
0.145
0.132
9%
Phenanthrene
pg/L
<0.105
<0.102
NA
<0.100
<0.100
NA
Pyrene
pg/L
<0.105
<0.102
NA
<0.100
<0.100
NA
Notes:
% = Percent.
< = Less than.
pg/L = Microgram(s) per liter.
NA = Not applicable.
RPD = Relative percent difference.
Page 1 of 1
-------
EXHIBIT 1
V (JJJ) MWH J
-------
CZ3 CZ3' d1 CZ3
CZ3 H-3
DATA VERIFICATION FORM
Analytical Method/Analytes:
Laboratory:
Preparation Batch Identification:
Analytical Batch Identification:
Verification Completed By (Signature and Date;):
SW 846 8270D SIM (PAHs)
TestAmerica
65828
Sample Collection Date(s):
MWH Job Number:
Mate
October 21-22, 2014
10500630.0203
Groundwater
Sample Identification
Lab Identification
Hits (Y/N)
Qualifications
Comments
1
D-6-GW-1014
310-42106-1
Y
UJ, J-
%R
-------
DATA VERIFICATION FORM
Analytical Method/Analytes: SW 846 8270D SIM (PAHs)
Laboratory: - TestAmerica
Preparation Batch Identification: ¦ 65828
Analytical Batch Identification: - . 6695?
Data Validation Criteria
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
Hold Time . . ..
A
A
A
A
A
A
Sample. Preservation
A
A
A
A
A
A
AnalyteList
A
A
A
A
. A
A
Reporting Limits
A
A.
A
A
...A
A
Method Blank
A
A
A
A
A
A
Surrogate Spike Recovery
X
A
A
A
A
A
Laboratory Control Sample. """
A
A
A
A
A
A
Laboratory Control Sample Duplicate
NA
NA
NA
NA
NA
NA
Matrix Spike/Matrix Spike Duplicate
A
A
A
A
A
A
Trip Blank
NA
NA
NA
NA
NA
NA
Field Duplicate
NA
NA
NA
NA
A
A .
Equipment Rinsate Blank
NA
NA
NA
NA
NA
NA
Notes:
A = Verification criteria were met. ¦
NA = Criteria are not applicable for the specified analytical method or sample.
X = Verification criteria were not met.- -
Page 2 of 2
CZ3 CZD 3 CD CZ3 CZJ ~
-------
3 cm czn3 czd cum .~
r" i
DATA VERIFICATION FORM
Analytical Method/Analytes:
Laboratory:
Preparation Batch Identification:
Analytical Batch Identification:
Verification Completed By (Signature and Date):
SW 846 8270D SIM (PAHs)
TestAmerica
65828
Sample Collection Date(s):
MWH Job Number:
Matrix:
October 21-22, 2014
10500630.0203
Groundwater
Sample Identification
Lab Identification
Hits (Y/N)
Qualifications
Comments.
1
D-6-GW-1014
310-42106-1
Y
J-
%R
-------
DATA VERIFICATION FORM
Analytical Method/Analytes: SW 846 8270D SIM (PAHs)
Laboratory: ' TestAmerica
Preparation Batch Identification: 65828
Analytical Batch Identification: ¦ 67095
Data Validation Criteria -
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
Hold Time
A
A
A
A
Sample Preservation
A
A
A
A
Analyte List
A
A
A
A
Reporting. Limits
A
A
A
A
Method Blank
A
A
A
A
Surrogate Spike Recovery
X
X
A
A
Laboratory Control Sample
A
A
A
A
Laboratory Control Sample Duplicate
NA
NA
NA
NA
Matrix Spike/Matrix Spike Duplicate
A
A
A
A
Trip Blank
NA
NA
NA
NA
Field Duplicate
NA
NA
NA
A
Equipment Rinsate Blank
NA
NA
NA
NA
Notes:
A = Verification criteria were met.
NA = Criteria are not applicable for the specified analytical method or sample.
X = Verification criteria were not met.
Page 2 of 2
czz3 ~ cud czj c__: c_: c j t ; : ; •: ) ; : : : l_: : ; l_
-------
3 CHU CH5 CZD
CHJ CZJ
DATA VERIFICATION FORM
Analytical Method/Analytes: .. •
Laboratory:
Preparation Batch Identification:
Analytical Batch identification:
Verification Completed By (Signature and Date):
SW 846 8270DS1M (PAHs)
TestAmerica
65828
67143
Sample Collection Date(s):
MWH Job Number:
Matrix:
October 21-22, 2014
10500630.0203
Groundwater
~{£
Sample Identification
Lab Identification
Hits (Y/N)
Qualifications
Comments
. 1
D-6-GW.-1014
310-42106-1
Y
J-
1:1000 dilution. Naphthalene only. %R
-------
DATA VERIFICATION FORM
SW 846 8270D SIM (PAHs)
TestAmerica
65828
67143
Data Validation Criteria
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
Hold Time
A
Sample Preservation .
A
Analyte List
A
Reporting Limits
A
Method Blank
A
Surrogate Spike Recovery
X
Laboratory Control Sample
A
1.
Laboratory Control Sample Duplicate •
NA
Matrix Spike/Matrix Spike Duplicate
A
Trip Blank •
NA
Field Duplicate
NA
Equipment Rinsate Blank .
NA
Analytical Method/Analytes:
Laboratory:
Preparation Batch Identification:
* Analytical Batch Identification:
Notes:
A = Verification criteria were met.
NA = Criteria are not applicable for the specified analytical method or sample.
X = Verification criteria were not met.
Page 2 of 2
C3D C~3 CZZ2 £~D CZ3 C™1 CZ3 C_3 C_J
-------
CZ3 C
CID C
czn c=3 ~
DATA VERIFICATION FORM
Analytjcai Method/Analytes:
Laboratory:
Preparation Batch Identification:
Analytical Batch Identification:
Verification Completed By (Signature and Date):
SW 846 8270D SIM (PAHs)
T estAmerica
65793
Sample Collection Date(s):
MWH Job Number:
Matrix:
October 21-22, 2014
1G500630.0203
Groundwater
Sample Identification
Lab Identification
Hits (Y/N)
Qualifications
Comments
1
SE-2~.GW-1.014
310-42101-1
Y
None
1:10 dilution. Acenaphthene arid acenaphthylene only.
2
SS-6-GW-1014
310-42101-2
Y
None
1:10 dilution for all PAHs except acenaphthylene, 2-methylnaphthalene, :and
naphthalene. RL>Cleanup Level benzo[k]fliioranthene, dibenz(a,h)anthracene,
and lndeno[1,2,3-cd]pyrene due to dilution.
3
SS-6-GW-1014
310-42101-2
Y
None
1:100 dilution. Aenaphthylene and 2-methylnaphthalene only.
4
SS-6-GW-T014
310-42101-2
Y
None
1:1000 dilution. Naphthalene only.
. 5
SS-9-GW-1014
310-42101-3'
Y
None
1:10 dilution! Acenaphthene and naphthalene only.
6
W-21R-GW-1014
310-42101-7
Y
None
1:10 dilution. Acenaphthene only.
7
W-129-GW-1014
310-42101-13
Y
None
¦ 1:10 dilution. Acenaphthene only.
8
W-130-GW^1014
¦ 310-42101-14
Y
None
1:10'dilution. Acenaphthene and acenaphthylene only.
9
D-5-GW-1014 ¦
310-42101-15
Y'
None
1:10 dilution for all PAHs except for acenaphthene,^methylnaphthalene, and
naphthalene. RL>Cleanup Level for 6 PAHs due to dilution.
10
D-5-GW-1014
" ' 310-42101-15
Y
None .
1:100 dilution: Acenaphthene and 2-methylnaphthalene only. .
11
D-8-GW-1014
310-42101-17 '
Y
None
1:10 dilution. Naphthalene only.
12
SE-3-GW-1014
310-42101-18
Y
None
'1:10 dilution. Phenanthrene only. •
13
SE-3-GW-1014
310-42101-18
Y
None
1:100 dilution. Acenaphthene and 2-methylnaphthalene only.
14
SE-4-GW-1.0T4
310-42101-19
Y
None
1:10 dilution. Acenaphthene, fluorene, 2-methylnaphthalene, and
phenanthrene only. ¦ ,
15
SE-5-GW-1014
310-42101-20
Y
None
1:10 dilution. Acenaphthene only.
16
17
18
19
- ¦
20
Page 1 of 2
-------
DATA VERIFICATION FORM
Analytical Method/Analytes: SW 846 8270D SIM (PAHs)
Laboratory: TestAmerica
Preparation Batch Identification: 65793
Analytical Batch Identification: - 67095
Data Validation Criteria
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
Hold Time
A
A
A
A
A
A
A
A
A
A
A
A
A
. A
A
Sample Preservation
A
A
. A
A
A
A
A
A
A
A
A
A
A
.. A
A
Analyte List
A
A
A
A
A
A
. A
A
A
A
A
A
A
A
A
Reporting Limits '
A
A
A
A
A
A
A
A
A
A
A
A
A
A
A
Method Blank
A
A
A
A
A
A
A
A
A
A
A
A
A
A
A
Surrogate Spike Recovery
A
A
A
A
A
A
A.
A.
A
A
A
A
A
A
A
Laboratory Control Sample
A
A
A
A
A
A
A
A
A
A
A
A
A
A
A
Laboratory Control Sample Duplicate
NA
NA
NA
NA
NA
NA
NA
NA
NA
NA
NA
NA
NA
NA
NA
Matrix Spike/Matrix Spike Duplicate
NA
NA
NA
NA
NA
NA
NA
NA
NA
NA
NA
NA
NA
NA
NA
Trip Blank
NA
NA-
NA
NA
NA
NA
NA
NA
NA
NA
NA
NA
NA
NA
NA
Field Duplicate
NA
NA
¦ NA
NA
NA
NA
NA
NA
NA
NA
NA
NA
NA
NA
NA
Equipment Rinsate Blank
NA
NA
NA
NA
NA
NA
NA
NA
NA
NA
NA
NA
NA
NA
NA
Notes:
¦-'A = Verification criteria were met.
NA = Criteria are not applicable for the specified analytical method or sample.
X = Verification.criteria were not met.
Page 2 of 2
C~J CZ3 CH3 C3 £H3 CH2 CZ3 CZ3 C_J C__J Z—J C } C / C 3 L_J [ : L_
-------
CZ3 nn CZ3 CH3 CZ? CZ3 CZ3 CUD ' CU L__J c__j l_j C : ¦; j .; ; ; ]
DATA VERIFICATION FORM
Analytical Method/Anaiytes:
Laboratory:
Preparation Batch identification:
Analytical Batch Identification:
Verification Completed By (Signature and Date):
SW 846 8270D SIM (PAHs)
TestAmerica
65793
Sample Collection Date(s):
MWH Job Number:
Matrix:
October 21-22, 2014
10500630.0203
Groundwater
Sample Identification
Lab Identification
Hits (Y/N)
Qualifications
Comments
1
SE-2-GW-1014
310-42101-1
Y
None
1:100 dilution. Naphthalene only.
2
D-5-GW-1014
310-42101-15
Y
None
1:1000 dilution. Naphthalene only.
3
SE-3-GW-1014
310-42101-18
Y
None
1:1000 dilution. Naphthalene only.
4
5
6
7
8
9
10
11:
12
1:3
. ¦
-
14
J
¦ ' -
15
16
17
18
¦
19
-
20
Page 1 of 2
-------
DATA VERIFICATION FORM
Analytical Method/Analytes: . SW 846 8270D SIM (PAHs)
Laboratory: . TestAmerica
Preparation Batch Identification: 65793
Analytical Batch Identification: 67143
Data Validation Criteria
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
Hold Time
A
A
A
Sample Preservation ' -
A
A
. A
Analyte List •-
A
A
A
Reporting Limits ¦ ¦¦ ¦
A
. A
A
Method Blank
A
A
A
Surrogate Spike Recovery
A
A
A
Laboratory Control Sample
A
A
A
Laboratory Control Sample Duplicate
NA
NA
NA
Matrix Spike/Matrix Spike Duplicate
NA
NA
NA
Trip Blank ' _ . .
NA
NA
NA
Field Duplicate
NA
NA
NA
Equipment Rinsate Blank
NA
NA
NA
Notes:
i
A = Verification criteria were met.
NA = Criteria are not applicable for'the specified analytical method or sample.
X = Verification criteria were not met.
Page 2 of
CZj
£__3
-------
DATA VERIFICATION FORM
Sample Collection Date(s):
MWH Job Number:
Matrix
October 21-22, 2014
10500630.0203
Groundwater
Analytical Method/Analytes:
Laboratory:
Preparation Batch Identification:
Analytical Batch Identification:
Verification Completed By (Signature and Date):
SW 846 8270D SIM (PAHs)
TestAmerica
65793
66909
Sample Identification
Lab Identification
Hits (Y/N)
Qualifications
Comments
1
.SE-2-G.W-1.014
310-42101-1
Y
None
All PAHs except acenaphthene, acenaphthylene,: and naphthalene:
2
SS-9-GW-1014
310-42101-3
Y
None
. All PAHs except acenaphthene and naphthalene.
;3
W-4-GW-1014
310-42101-4
Y
None
4
W-13-GW-1014
310-42101-5
N
UJ
Parent sample for MS/MSD. MS %Rec
-------
DATA VERIFICATION FORM
Analytical Method/Analytes: SW 846 8270D SIM (PAHs)
Laboratory: - ; . TestAmerica
Preparation Batch Identification: ^ 65793
Analytical Batch Identification: 66909
Data Validation Criteria
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
Hold Time
A
A
A
A
A
A
A
A
. A
A
A
A
A
A
A
A
. A
A
A
Sample Preservation
A
A
A
A
A
A
A
A
A
A
A
A
A
A
A
A
A
A
A
Analyte List
A
A
A
A
A
A
A
A
A
A
A
A
A
A
A
A
A.
A
A
Reporting Limits
A
A
A
A
A
A
A
A
A
A
A
A
A
A
A
A
A
A
A
Method Blank ¦ . -
A
A
A
A
A
A
A
A
-A
A
A
A
A
A
A
A
A
A
. A
Surrogate Spike Recovery
A
A
A
A
A
' A
A
A
A
X
A
A
A
A
A
A
A
A-
A
Laboratory Control Sample
- A
A
A .
A
A
A
¦ A
A
A
A
A
A
A
A
A
A
A
A
A
Laboratory Control Sample Duplicate
NA-
NA
NA-
NA
NA
NA
NA
NA
NA
NA
NA
NA
NA-
NA
NA
NA
NA
NA
NA
MatrixiSpike/Matrix Spike Duplicate
NA
NA-
NA-
X
NA
NA
NA
NA
NA
NA
NA
NA
NA
NA
NA
NA
NA
NA
NA
Trip Blank ;
NA
NA
NA
NA
NA
NA
NA
NA
NA
NA
NA
NA
NA
NA
NA
NA
NA
NA
NA
Field Duplicate
NA
NA
NA
NA
NA
NA
NA
NA
NA
NA
NA
NA
NA
NA
NA
NA
NA
NA
NA
Equipment Rinsate Blink
NA
NA
NA
NA
NA
NA
NA
NA
NA
NA
NA
NA
NA
NA
NA
NA
NA
NA
NA
Notes:
A =-Verification criteria were met.
NA = Criteria are not applicable for the specified analytical method or sample.
X = Verification criteria were not met.
Page 2 of 2
C33 CZ3 EH3 CUD CZ3 C3
C__J
-------
EH3 CZ3 CZ3
CZH CHJ CZI3 C.
DATA VERIFICATION FORM
Analytical Method/Analytes:
Laboratory:
Preparation Batch Identification: ¦
Analytical Batch Identification:
Verification Completed By (Signature and Date):
SW 846 8260C (BTEX)
T estAmerica
NA
Sample Collection Date(s):
MWH Job Number:
Matrix:
65875
October 21-22, 2014
10500630.0203
Groundwater
/ - 2.1" M
Sample Identification
Lab Identification
Hits (Y/N)
Qualifications
Comments
1
D-8-GW-1014
310^42101-17 •
Y
None
2
3
4
5
6
7
8
-
9
:10
,1;1
:12
13
14
15
-
16
17
- .
-
18
19
20
Page 1 of 2
-------
DATA VERIFICATION FORM
Analytical Method/Arialytes:
Laboratory:
Preparation Batch Identification
Analytical Batch Identification:
SW 846 8260C (BTEX)
TestAmerica
_NA
65875
Data Validation Criteria
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
Hold Time
A
Sample. Preservation
A
Analyte List -
A
Reporting-Limits
A
Method Blank
. A
Surrogate Spike Recovery
A
Laboratory Control Sample
A
Laboratory Control Sample Duplicate
NA
Matrix Spike/Matrix Spike Duplicate
NA
Trip-Blank
NA
Field Duplicate
NA
Equipment Rinsate Blank
NA
Notes:
A = Verification criteria were met.'
NA = Criteria are not applicable for the specified analytical method or sample.
X = Verification criteria were not met.
Page 2 of 2
CZ3 C33 C3 C=3 S~2 CZ3 CZZJ CZ2
L__3 t 3
-------
C~~j EI3 CH3
CZ3 CC-3
DATA VERIFICATION FORM
Analytical Method/Analytes:
Laboratory:
Preparation Batch Identification:
Analytical Batch Identification:
Verification Completed By (Signature and Date):
SW 846 8260C (BTEX)
TestAmerica
Sample Collection Date(s):
MWH Job Number:
Matrix:
October 21-22, 2014
10500630.0203
Groundwater
Sample Identification
Lab Identification
Hits (Y/N)
Qualifications
Comments
i
SE-2-GW-1.014
310-42101-1
Y
None
2
SS-6-GW-1014
310-42101-2
Y
None
1:10 dilution.
3
SS-9-GW-1014
310-421.01-3
Y
None
4
W-4-GW-.1014
310-42101-4
N
None
5
W-13-GW-1014
310-42101-5
N
None
6
W-15-GW-1014 '
310-42101-6
N
None
7
W-21R-GW-1014
310-42101-7
Y
None
8
W-29-GW-1014
310^42101-8
N
None
9
W-30-GW-1014
310-42101-9
N
None
10
W-113-GWr1014
310-42101-10
N
None
11
W-118R-GW-1014
310-42101-11
N
None
'
12.
W-128-GW-1014
310-42101-12
N
¦ None
13
¦W-129-GWt1.014 '
310-42101-13
Y
None
14
W-130-GW-1.01.4
-310-42101-14
Y
None
15
D-5-GW-10.14 -
• 310-42101-15
Y
None •
1:10 dilution.
16
D-7-GW-1014:
310-42101-16
Y
None
1:50 dilution.
17
D-8-GW-1014
310-42101-17
Y
None
18
SE-3-GW-1014
310-42101-18
Y
None
1:10 dilution.
19
SE-4-GW-1014
3.10-42101-19..
Y
None
20
SE-5-GW-1014
310-42101-20
Y
None ¦
Page 1 of 2
-------
DATA VERIFICATION FORM
Analytical Method/Analytes:
Laboratory:
Preparation Batch Identification
Analytical Batch Identification:
SW 846 8260C (BTEX)
TestAmerica
NA
65730
Data Validation Criteria
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
Hold Time
A
A
A
A
A
A
A
A
A
A
A
A
A
A
A
A
A
A
A
A
Sample Preservation
A
A
A
A
A
A
A
A
A
A
A
A
A
A
A
A
. A
A
A
A
Analyte List
A
A
A
A
A
A
A
A
. A
A
A
A
A
A
A
A
A
A
A
A
Reporting Limits
A
A
A
A
A
A
A
A
A
A
A
A
A
A
A
A
A
A
A
A
Method Blank
A
A
A
A
A
A
A
A
A
A
A
A
A
A
A
A
A
A
A
A
Surrogate Spike Recovery
A
A
A
A
A
A
A
A
A
A
A
A
A
A
A
A
A
A
A
. A
Laboratory Control Sample
A
A
A
A
A
A
A
A
¦ A
A
A
A
A
A
A
-A •
A
A
A
A
Laboratory Control Sample Duplicate
NA
NA
NA
NA
NA
NA
NA
NA
NA
NA
NA
NA
NA
NA
NA
NA
NA
NA
NA
NA
Matrix Spike/Matrix Spike Duplicate
NA
NA
NA
NA
NA
NA
NA
NA
NA-
NA
NA
NA
NA
NA
NA
NA
NA
NA
NA
NA
Trip.Blank
NA
NA
NA
NA
NA
NA
NA
NA
NA
NA
NA
NA
NA
NA
NA
NA
NA
NA
NA
NA
Field Duplicate ,
NA
NA
NA
NA
NA
NA
NA
NA
NA
NA
NA
NA
NA
NA
NA
NA
NA
NA
NA
NA
Equipment Rinsate Blank
NA
NA
NA
NA
NA
NA
NA
NA
NA
NA
NA
NA
NA
NA
NA
•NA
NA
NA
NA
NA
Notes:
A = Verification criteria were met.
' NA = Criteria are not applicable for the specified analytical method or sample.
X = Verification criteria were not met. .
Page 2 of 2
Q C
CZ3 CH2 CZ3 CZ3
-------
C~! EZZ3 CH3 CH3
L_Z! £!~
DATA VERIFICATION FORM
Analytical Method/Analytes:
Laboratory:
Preparation Batch Identification:
Analytical Batch Identification:
Verification Completed By (Signature and Date):
SW 846 8260C (BTEX)
T estAmerica
Sample Collection Date(s):
MWH Job Number:
Matrix:
October 21-22, 2014
10500630.0203
Groundwater
Sample Identification
Lab Identification
Hits (Y/N)
Qualifications
Comments
1
D-6-GW-1014
¦310-42106-1
Y
None
1:10 dilution.
2
P-112-GW-1014
310-42106-2
Y
None
3
SS-8-GW-1014
310-42106-3
Y
None
-
4
W-117R-GW-1014
310-42106-4
Y
None
5
DP-01-GW-1014
310-42106-5
N
None
6
DP-02-GW-1014-
310-42106-6
Y
None
7
TB-01
310-42106-7
¦ N '
None
8
TB-02
310-42106.8
N
None
9
10
11
*
12
13
14
15
16
17
18
-¦
19
20
Page 1 of 2
-------
DATA VERIFICATION FORM
Analytical Method/Analytes:
Laboratory:
Preparation Batch Identification
Analytical Batch Identification:
SW 846 8260C (BTEX)
TestAmerica
NA
65810
Data Validation Criteria
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
Hold Time
A
A
A
A
A
A
A
A
Sample Preservation
A
A
A
A
A
A
A
A
Analyte List
A
A
A
A
A
A
A
A
Reporting Limits •
A
A
A
A
A
A
A
A
Method Blank
A
A
A
A
A
A
A
A
Surrogate Spike Recovery
A
A
A
A
.A
A
A
A
Laboratory Control Sample ¦
A
A
A
A
A
A
A
A
Laboratory Control Sample Duplicate
NA
NA
NA
NA
NA
NA
NA
NA
Matrix Spike/Matrix Spike Duplicate
A
A
A
A
A
A
A
A
Trip Blank
NA
NA
NA
NA
NA
NA
A
A
Field Duplicate
NA
NA
NA
NA
A
A
NA
NA
Equipment Rinsate Blank
NA
NA
NA
NA
NA
NA
NA
NA
Notes:
A =. Verification criteria were met.
NA = Criteria are not applicable for the specified analytical method or sample.
X = Verification criteria were not met.
C~_j
Page 2 of 2
-------
EZD £=~ CZ] ~
czn cm] czj
L_a
DATA VERIFICATION FORM
Analytical Method/Analytes:
Laboratory:
Preparation Batch Identification:
Analytical Batch Identification:
Verification Completed By (Signature and Date):
SW 846 8260C (BTEX)
TestAmerica
Sample Collection Date(s):
MWH Job Number:
Matrix:
October 21-22, 2014
10500630.0203
Groundwater
Sample Identification
Lab Identification
Hits (Y/N)
Qualifications
Comments
1
SS-9-GW-1014
310-42101-3
Y
None
2
¦3
4
5
6
7
8
9
10
11
12
13
14
15
16
• 1
17
1-8
19
20
1
Page 1 of 2
-------
DATA VERIFICATION FORM
Analytical Method/Analytes:
Laboratory:
Preparation Batch Identification
Analytical Batch Identification:
Data Validation Criteria
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
Hold Time
A
Sample Preservation
A
Analyte List
A
Reporting Limits
A
Method Blank
A
Surrogate Spike Recovery
A
Laboratory Control Sample
A
Laboratory Control Sample Duplicate
NA
Matrix Spike/Matrix Spike Duplicate .
NA
Trip Blank
NA
Field Duplicate
NA
Equipment Rinsate Blank
NA
Notes:
A = Verification criteria were met.
NA = Criteria are not applicable for the specified analytical method or sample.
X = Verification criteria were not met.
SW 846 8260C (BTEX)
TestAmerica
NA
66072
Page 2 of
-------
ATTACHMENT 3
Site Inspection Report
31
-------
Attachment 3
Site Inspection Form
I. SITE INFORMATION
Site name: Peoples Natural Gas
Date of inspection: July 10, 2014
Location: 925 Kerper Boulevard, Dubuque, IA
EPA ID: IAD 980852578
Agency, office, or company leading the five-year
review: EPA Region 7
Weather/temperature: 70s and partially cloudy
Remedy Includes: (Check all that apply)
~ Landfill cover/containment
~ Access controls
13 Institutional controls
13 Groundwater pump and treatment
~ Surface water collection and treatment
~ Other
IE] Monitored natural attenuation
13 Groundwater containment
~ Vertical barrier walls
II. INTERVIEWS (Check all that apply)
1. PRP site manager Jenny Coughlin
Name
Interviewed 13 at site ~ at office ~ by phone Phone no.
Sr. Environmental Analyst
Title
7-10-2014
Date
2. PRP contractor Kevin Armstrong_
Name
Site Manager
7-10-2104
Title
Date
Interviewed 13 at site ~ at office ~ by phone Phone no.
III. ACCESS AND INSTITUTIONAL CONTROLS 13 Applicable. ~ N/A
A. Fencing
1. Fencing damaged ~ Location shown on site map ~ Gates secured 3 N/A
Remarks Majority of site is fenced because citv does not permit unlimited access to the property. Not a
site requirement. Gate is unlocked during the dav to permit access. Treatment building locked when PRP
contractor is not working in the building.
B. Other Access Restrictions
1. Signs and other security measures
Remarks
~ Location shown on site map (3 N/A
-------
C. Institutional Controls (ICs)
1. Implementation and enforcement
Site conditions imply ICs not properly implemented ~ Yes 3 No ~ N/A
Site conditions imply ICs not being fully enforced ~ Yes ^ No ~ N/A
Type of monitoring (e.g., self-reporting, drive by) Self reporting^
Frequency
Responsible party/agency City
Contact Don Vogt Public Works Director_ 563-589-4344
Name Title Phone no.
Reporting is up-to-date El Yes ~ No ~ N/A
Reports are verified by the lead agency 13 Yes ~ No ~ N/A
Specific requirements in deed or decision documents have been met Kl Yes ~ No ~ N/A
Violations have been reported ~ Yes ~ No 131 N/A
Other problems or suggestions: ~ Report attached
2. Adequacy K ICs are adequate ~ ICs are inadequate ~ N/A
Remarks Deed restriction on IDOT property in the process of being replaced by UECA.
D. General
1. Vandalism/trespassing ~ Location shown on site map Kl No vandalism evident
Remarks
2. Land use changes on site 13 N/A
Re marks
3. Land use changes off site IEI N/A
Remarks_
IV. GENERAL SITE CONDITIONS
A. Roads ~ Applicable Kl N/A
B. Other Site Conditions
Remarks _Considerable amount of construction going on in the vicinity of the site including realignment
of Kerper Boulevard between the location of the former public works garage and the groundwater
treatment building.
V. LANDFILL COVERS ~ Applicable K1 N/A
VI. VERTICAL BARRIER WALLS ~ Applicable 3 N/A
-------
VII. GROUNDWATER/SURFACE WATER REMEDIES IE Applicable ~ N/A
A.
Groundwater Extraction Wells, Pumps, and Pipelines ~ Applicable ~ N/A
1.
Pumps, Wellhead Plumbing, and Electrical
IE] Good condition IEI All required wells properly operating ~ Needs Maintenance ~ N/A
Remarks Extraction svstem just beean operation.
2.
Extraction System Pipelines, Valves, Valve Boxes, and Other Appurtenances
13 Good condition ~ Needs Maintenance
Remarks
3.
Spare Parts and Equipment
IE Readily available ~ Good condition ~ Requires upgrade ~ Needs to be provided
Remarks
B. Surface Water Collection Structures, Pumps, and Pipelines ~ Applicable IE N/A
C.
Treatment System IE] Applicable ~ N/A
1.
Treatment Train (Check components that apply)
~ Metals removal IE] Oil/water separation ~ Bioremediation
~ Air stripping ~ Carbon adsorbers
~ Filters
IE1 Additive (e.s.. chelation agent, flocculent) in-well sequestering aeent
~ Others
IE] Good condition ~ Needs Maintenance
IE Sampling ports properly marked and functional
IE1 Sampling/maintenance log displayed and up to date
IE Equipment properly identified
~ Quantity of groundwater treated annually
~ Quantity of surface water treated annually
Remarks
2 .
Electrical Enclosures and Panels (properly rated and functional)
~ N/A IE Good condition ~ Needs Maintenance
Remarks
3.
Tanks, Vaults, Storage Vessels
~ N/A IE Good condition IE Proper secondary containment ~ Needs Maintenance
Remarks
4.
Discharge Structure and Appurtenances
~ N/A IE Good condition ~ Needs Maintenance
Remarks
-------
5.
Treatment Building(s)
~ N/A 13 Good condition (esp. roof and doorways) ~ Needs repair
13 Chemicals and equipment properly stored
Remarks
6.
Monitoring Wells (pump and treatment remedy)
13 Properly secured/locked 13 Functioning 13 Routinely sampled 3 Good condition
3 All required wells located ~ Needs Maintenance ~ N/A
Remarks
D. Monitoring Data
1.
Monitoring Data
13 Is routinely submitted on time 13 Is of acceptable quality
2.
Monitoring data suggests:
13 Groundwater plume is effectively contained ~ Contaminant concentrations are declining
E.
Monitored Natural Attenuation
1.
Monitoring Wells (natural attenuation remedy)
IE! Properly secured/locked 13 Functioning 13 Routinely sampled 13 Good condition
13 All required wells located ~ Needs Maintenance ~ N/A
Remarks
XI. OVERALL OBSERVATIONS
A.
Implementation of the Remedy
Describe issues and observations relating to whether the remedy is effective and functioning as designed.
Begin with a brief statement of what the remedy is to accomplish (i.e., to contain contaminant plume,
minimize infiltration and gas emission, etc.).
Implementation of the newest component of the remedv. the hvdraulic control svstem appears to be
successful and operating as designed. Other elements of the remedv continue to function as designed.
Land use in the area of the site is substantially the same with multiple construction project taking place
with a half mile of the site, primarily improvements in infrastructure ("roads, sewers and possiblv water
lines.)
B.
Adequacy of O&M
Describe issues and observations related to the implementation and scope of O&M procedures. In
particular, discuss their relationship to the current and long-term protectiveness of the remedy.
O&M appears to be adequate. Procedures for O&M for hvdraulic control svstem will be modified if need
is demonstrated after a period of operation.
-------
c.
Early Indicators of Potential Remedy Problems
Describe issues and observations such as unexpected changes in the cost or scope of-O&M or a high
frequency of unscheduled repairs that suggest that the protectiveness of the remedy may be compromised
in the future.
None at this time.
D.
Opportunities for Optimization
Describe possible opportunities for optimization in monitoring tasks or the operation of the remedy.
Optimization of operation of the hvdraulic control svstem will be on-goine and operating parameters will
be modified to optimize control of the groundwater plume.
------- |