SECOND FIVE-YEAR REVIEW REPORT FOR
ALUMINUM COMPANY OF AMERICA - DAVENPORT
SUPERFUND SITE
&
MISSISSIPPI RIVER POOL 15
SUPERFUND SITE
SCOTT COUNTY, IOWA
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Prepared by
U.S. Environmental Protection Agency
Region 7
Lenexa, Kansas
Digitally signed by Scott
D. Hayes
Date: 2022.07.19
Scott D.
Hayes
10:29:59 -05W
Scott D. Hayes, Acting Director
Superfund and Emergency Management Division
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Table of Contents
LIST 01 ABBREVIATIONS & ACRONYMS iii
I. INTRODUCTION 1
FIVE-YEAR REVIEW SUMMARY FORM 3
II. RESPONSE ACTION SUMMARY 3
Alcoa Site 3
Basis for Taking Action (Alcoa Site) 3
Response Actions (Alcoa Site) 4
RAOs for the Selection of the Remedy (Alcoa Site) 4
Remedy Components (Alcoa Site) 5
Status of Implementation (Alcoa Site) 5
System Operation and Maintenance (Alcoa Site) 8
MRP15 Site 9
Basis for Taking Action (MRP15 Site) 9
Response Actions (MRP15 Site) 9
Status of Implementation (MRP 15 Site) 10
System Operation and Maintenance (MRP 15 Site) 10
III. PROGRESS SINCE THE LAST REVIEW 11
Alcoa Site 11
MRP15 Site 12
IV. FIVE-YEAR REVIEW PROCESS 13
Community Notification, Involvement & Site Interviews 13
Interviews 13
Data Review 13
Data Review (Alcoa Site) 13
Data Review (MRP 15 Site) 19
Site Inspection 21
V. TECHNICAL ASSESSMENT 22
Alcoa Site 22
Question A: Is the remedy functioning as intended by the decision documents (Alcoa Site)? 22
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? (Alcoa Site) 23
Question C: Has any other information come to light that could call into question the protectiveness
of the remedy (Alcoa Site)? 25
MRP15 Site 24
Question A: Is the remedy functioning as intended by the decision documents? (MPR15 Site) 24
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 (MPR15 Site)? 25
Question C: Has any other information come to light that could call into question the protectiveness
of the remedy (MRP 15 Site)? 25
VI. ISSUES/RECOMMENDATIONS 25
Alcoa Site 25
MRP15 Site 26
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VII. PROTECTIVENESS STATEMENT 26
Alcoa Site 26
MR PI 5 Site 27
VIII. NEXT REVIEW 27
APPENDICES
in
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LIST OF ABBREVIATIONS & ACRONYMS
AOC
Administrative Order on Consent
ARAR
Applicable or Relevant and Appropriate Requirements
BLRA
Baseline Risk Assessment
CD
Consent Decree
cis-l,2-DCE
cis-1,2-dichloroethene
COCs
Contaminants of Concern
COPCs
Chemicals of Potential Concern
COPECs
Chemicals of Potential Ecological Concern
ESD
Explanation of Significant Differences
EPA
U.S. Environmental Protection Agency
FSA
Facility Site Assessment
FWDS
Former Waste Disposal Site
FYR
Five-Year Review
GCETS
Groundwater Containment Extraction and Treatment System
ICs
Institutional Controls
IDNR
Iowa Department of Natural Resources
ISGS
Iowa Statewide Groundwater Standard
LTMP
Long-term Groundwater Monitoring Plan
l^g/kg
Mi cr ogram s/ki 1 ogr am
^g/L
Mi cr ogram s/liter
MNR
Monitored Natural Recovery
MNRPP
MNR Program Plan
NAIP
National Agriculture Imagery Program
NPDES
National Pollution Discharge Elimination System
NPL
National Priorities List
O&M
Operation and Maintenance
OU
Operable Unit
PAHs
Polynuclear Aromatic Hydrocarbons
PCBs
Polychlorinated biphenyls
PCE
T etrachl oroethene
PID
Photoionization Detector
PRP
Potentially Responsible Party
RAOs
Remedial Action Objectives
RD/RA
Remedial Design/Remedial Action
RI
Remedial Investigation
ROD
Record of Decision
SDS
Safety Data Sheets
SMP
Site Management Plan
STMP
Short-Term Management Plan
TBC
To be considered
TCE
Trichl oroethene
TI
Technical Impracticability
VI
Vapor Intrusion
VOCs
Volatile Organic Compounds
1,1-DC A
1,1-dichloroethane
1,1-DCE
1,1-dichl oroethene
iv
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I. INTRODUCTION
The purpose of a five-year review (FYR) is to evaluate the implementation and performance of a remedy
to determine whether the remedy is and will continue to be protective of human health and the
environment. The methods, findings, and conclusions of reviews are documented in FYR reports such as
this one. In addition, FYR reports identify issues found during the review, if any, and document
recommendations to address them.
The U.S. Environmental Protection Agency has prepared this FYR report pursuant to the
Comprehensive Environmental Response, Compensation, and Liability Act Section 121, consistent with
the National Oil and Hazardous Substances Pollution Contingency Plan (NCP), 40 C.F.R. §
300.430(f)(4)(ii), and considering EPA policy.
This is the second FYR for the Aluminum Company of America - Davenport Superfund Site (Alcoa
Site) and the Mississippi River Pool 15 Superfund Site (MRP 15 Site). The triggering action for this
statutory review is the completion of the previous FYR on July 28, 2017. The FYR was conducted
because hazardous substances, pollutants, or contaminants remain at both Sites above levels that allow
for unlimited use and unrestricted exposure.
The Alcoa Site and the MRP15 Site are two separate sites that were addressed under one Record of
Decision (ROD) dated September 28, 2004. Both sites are addressed in this FYR report, and each site is
addressed under a single operable unit (OU).
The FYR was led by the Region 7 EPA with support from the Iowa Department of Natural Resources
(IDNR). Participants included:
Site Team
Name
Title
Organization
Hoai Tran
Remedial Project Manager
EPA Region 7
Pamela Houston
Community Involvement Coordinator
EPA Region 7
Katherine Gulley
Site Counsel
EPA Region 7
Jessica L. Kidwell
Geologist
EPA Region 7
Ann Jacobs
Human Health Risk Assessor
EPA Region 7
Venessa Madden
Ecological Risk Assessor
EPA Region 7
Matt Culp
State Project Manager
IDNR
Site Background
The Alcoa-Davenport Works facility (Alcoa facility) is an active manufacturing plant that has been
owned and operated by the Aluminum Company of America (Alcoa Inc.) since 1948. The Alcoa facility
is located in Riverdale, Scott County, Iowa (Appendix H, Figure 1-1). The town of Riverdale is adjacent
to Bettendorf, Iowa, which is one of the Iowa-Illinois Quad Cities. The Alcoa facility is an aluminum
sheet- and plate-rolling mill that is more than one mile in length and has approximately 120 acres under
one roof. Manufacturing and waste management activities at the Alcoa facility resulted in the
contamination of soil and groundwater at the Alcoa Site and contamination of sediment and fish at the
MRP15 Site.
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The Alcoa property, or site property, comprises approximately 460 acres of land (Appendix H,
Figure 1-2). The site property is bounded to the north by State Route 67; to the south by the Mississippi
River; to the east by industrial use properties; and to the west by South Bellingham Street. The site
property is zoned heavy industrial. The area to the north, along State Route 67, is zoned residential and
commercial. The area bordering the site property to the east is zoned commercial and light industry. At
the time of the remedial investigation (RI), the area to the west, along South Bellingham Street, was
zoned residential, commercial, and light industrial. After the 2004 ROD, Alcoa Inc. purchased all the
residential properties and demolished the houses. The area was subsequently rezoned to its current status
of light industrial and heavy industrial. Future land use at the site property and surrounding areas is
anticipated to remain the same.
Groundwater at the Alcoa Site is not used for drinking water. Historically, Alcoa Inc. extracted
groundwater with process wells and used it for industrial purposes. In 1989, Alcoa Inc. repurposed the
process wells primarily for hydraulic containment of contaminated groundwater. The process wells
currently operate to hydraulically contain contaminated groundwater. The extracted groundwater is
treated by an air stripper system, used for industrial purposes, and discharged to the Mississippi River
under a National Pollution Discharge Elimination System (NPDES) permit. Future groundwater use at
the Alcoa Site is anticipated to remain the same.
The MRP15 Site (Appendix H, Figure 1-3) spans approximately ten miles of the Mississippi River from
Federal Lock and Dam 14 on the upriver end to Federal Lock and Dam 15 on the downriver end. The
MRP15 Site starts at river mile 483 and ends at river mile 493. The Alcoa facility is located near river
mile 489.
There are no current or future land uses associated with the MRP 15 Site because there are no land areas.
There are no current or future groundwater uses associated with the MRP 15 Site. Surface water in the
MRP15 section of the Mississippi River is used for commercial and recreational purposes. Commercial
barge traffic is restricted to the channel near the middle of the river. Recreational boating and fishing are
enjoyed throughout the MRP15 Site. Future surface water use at the MRP15 Site is anticipated to remain
the same.
Alcoa Inc. is the Settling Defendant required by the consent decree (CD) to conduct the remedial
design/remedial action (RD/RA) at both Sites. On November 1, 2016, Alcoa Inc. split into two separate
publicly traded companies: Alcoa Corp. and Arconic Inc. After the company split, the legal entity
responsible for implementing the RAs became Arconic Inc. To be consistent with the CD, this FYR
report will continue to use Alcoa Inc. as the name of the Settling Defendant. Alcoa Inc. was notified of
the initiation of the second FYR. The second FYR began on January 28, 2021.
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FIVE-YEAR REVIEW SUMMARY FORM
SITE IDENTIFICATION
Site Name: Aluminum Company of America - Davenport Site and
Mississippi River Pool 15 Site
EPA ID: IAD005270160 (Alcoa Site) & IAD981117161 (MRP15 Site)
Region: 7 State: IA
NPL Status: Non-NPL
City/County: Riverdale/Scott
SITE STATUS
Multiple OUs?
No
Has the site achieved construction completion?
Yes
Lead agency: EPA
Author name (Federal or State Project Manager): Hoai Tran
Author affiliation: EPA
Review period: 1/28/2021 - 7/28/2022
Date of site inspection: 7/9/2021
Type of review: Statutory
Review number: 2
Triggering action date: 7/28/2017
Due date (fiveyears after triggering action date): 7/28/2022
II. RESPONSE ACTION SUMMARY
Alcoa Site
Basis for Taking Action
The Groundwater Remedial Investigation Report for the Alcoa Site, dated May 14, 2002, did not
identify specific chemicals of concern (COCs), but instead, the RI report identified chemicals of
potential concern (COPCs). Chemicals of potential ecological concern (COPECs) were identified in the
Ecological Risk Characterization - Facility Site Assessment (FSA) Units dated September 2001. The
COPCs and COPECs for the Alcoa Site can be categorized into the following groups of chemicals:
Volatile organic compounds (VOCs)
Polynuclear aromatic hydrocarbons (PAHs)
Poly chlorinated biphenyls (PCBs)
Metals
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The RI report identified 13 VOCs as COPCs in groundwater that were carried through the baseline risk
assessment (BLRA). Due to the size of the site property, the ecological risk assessment separated the site
property into several decision units, called facility site assessment (FSA) units (Appendix H, Figure 2-
1). The ecological risk assessments for all the FSA units were summarized in the Ecological Risk
Characterization - Facility Site Assessment Units dated September 2001. A select list of PAHs, PCBs
and metals were identified as COPECs in surface soil and sediment during the ecological risk
assessments. The COPCs and COPECs were summarized in the 2004 ROD.
Following the 2004 ROD, the EPA issued an Explanation of Significant Differences (ESD) dated July
2007 to clarify the COPCs and COPECs that would be carried forward as COCs, with performance
standards and monitoring levels in the subsequent implementation of the groundwater monitoring
program. The COCs and monitoring parameters are presented in Appendix G, Tables 2-1 and 2-2,
respectively.
In August 1995, the EPA and Alcoa Inc. entered into an Administrative Order on Consent (AOC) (EPA
Docket No. VII-95-F-0026) that required Alcoa Inc. to conduct a BLRA at the Alcoa Site. The BLRA
concluded that COPCs in groundwater, if used as drinking water, posed an unacceptable risk to human
health. In addition, the BLRA concluded that there were no unacceptable risks to workers or trespassers
from soils or other environmental media, based on the exposure scenarios evaluated pursuant to the 1995
AOC.
An ecological risk assessment was also conducted, which concluded that potential ecological risks were
low in the terrestrial areas and the outfalls.
Response Actions
Pre-ROD response activities at the Alcoa Site include the following:
• From 1979 to 1981, Alcoa Inc. performed a voluntary response program to address PCBs in the
surface impoundment, which is also referred to as the former oil lagoon or the former waste
disposal site (FWDS) (Appendix H, Figure 2-2).
• In February 1984, Alcoa Inc. entered into an AOC with the EPA to install an oil interception and
recovery trench at the impoundment and to cap the impoundment with a low-permeability
compacted clay.
• In February 1984, Alcoa Inc. disposed of PCB-containing oil and cleaned up three, one million-
gallon storage tanks pursuant to two consent agreements with the EPA.
• In August 1986, Alcoa Inc. entered into an AOC with the EPA to formulate and implement a
detailed groundwater monitoring plan.
• Just prior to finalizing the 2004 ROD, Alcoa Inc. performed sub-slab gas sampling beneath the
basements of two unoccupied houses that were located near the western border of the site
property.
• In addition to the work described above, Alcoa Inc. conducted remediation under other
environmental regulatory programs, as described in Appendix B, Site Chronology.
RAOs for the Selection of the Remedy
The remedial action objectives (RAOs) for the Alcoa Site were established in the 2004 ROD. The
general RAOs for the Alcoa Site are to: 1) prevent exposure to groundwater containing carcinogens and
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noncarcinogens in excess of applicable or relevant and appropriate requirements (ARARs); and 2)
integrate previous or ongoing source and groundwater response actions into a remedial strategy that
reduces or eliminates the migration of contaminants from the site property to off-site areas, including the
MRP15 Site.
The 2004 ROD also specified RAOs with respect to different portions of the groundwater plume. The
specific RAOs are to: 1) manage and monitor the migration of on-site groundwater that contains site-
related contaminants at levels above ARARs to prevent contaminant migration in the vicinity of South
Bellingham Street; 2) manage and monitor the migration of on-site groundwater to prevent the discharge
of site-related contaminants at levels that would result in an unacceptable risk to surface water receptors
at the MRP 15 Site; and 3) monitor the migration of COPCs in groundwater that currently flows off the
site property to the east to ensure concentrations remain below ARARs and manage the off-site flow if
groundwater concentrations exceed ARARs.
Remedy Components
The remedy for the Alcoa Site is groundwater containment, which includes the ongoing operation of a
groundwater containment extraction and treatment system (GCETS), source area remediation,
groundwater monitoring, and institutional controls (ICs).
The remedy established a Technical Impracticability (TI) zone (Appendix H, Figure 2-3) on the site
property, within which the groundwater cleanup is not expected to meet drinking water standards within
a reasonable timeframe. The remedy specified groundwater monitoring to assure performance standards
are met outside the TI zone.
The EPA issued an ESD dated July 2007 to clarify performance standards and monitoring levels for the
Alcoa Site. The performance standards and monitoring levels are presented in Appendix G, Tables 2-1
and 2-2, respectively.
Status of Implementation
Following the 2004 ROD, Alcoa Inc. entered into a CD with the EPA on December 11, 2008. The CD
required Alcoa Inc. to design and implement the site-specific RA. Pursuant to the CD, Alcoa Inc.
submitted the RD/RA Work Plan dated September 2011. The RD/RA Work Plan was initially approved
in 2011 but was subsequently revised following the installation of a shallow tray air stripper system in
2012 and the conclusion of a groundwater flow analysis in January 2013. The revised RD/RA Work
Plan was approved in May 2013.
In October 2017, Alcoa Inc. petitioned the EPA to modify the GCETS monitoring program and the
Long-term Groundwater Monitoring Plan (LTMP) in the RD/RA Work Plan (Appendix G, Table 2-3).
The EPA approved the modified GCETS monitoring program and LTMP in March 2018 (Appendix G,
Table 2-4). In general, the modifications reduced the frequency of water level measurements at all
monitoring wells from quarterly to semiannually. Sampling of monitoring wells was also reduced in
frequency from quarterly to either semiannually or annually, and the types of analysis were revised to
align with the specific objectives of each monitoring well. Groundwater samples throughout the Alcoa
Site are analyzed for all parameters in the year prior to the due date of the FYR report. Alcoa Inc. began
implementing the modifications in March 2018.
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Pursuant to the CD, Alcoa Inc. submitted the Final RA Report for the Alcoa and MRP 15 Sites, dated
May 2019, to document the completion of the remedial actions at both Sites. The EPA approved the
report on September 5, 2019, to certify that the RAs at both Sites were completed in full satisfaction of
the requirements of the CD.
Alcoa Inc. performs long-term operation and maintenance (O&M) at both Sites in accordance with the
Site Management Plan (SMP) for the Alcoa and MRP 15 Sites dated May 2019. The SMP was
previously referred to as the O&M Plan, but the title was changed during the most recent update to
reflect the scope of the document. The SMP implements the remedies at both Sites and contains the
following volumes:
Volume I - Management Plan Overview (Text, Tables and Figures)
Volume II - GCETS O&M Plan
Volume III - Alcoa Site Groundwater Plan and Quality Assurance Project Plan (QAPP)
Volume IV - MRP 15 Monitoring Plan
Volume V - Health & Safety Plans
Groundwater Containment Extraction and Treatment System
At the time of the 2004 ROD, Alcoa Inc. was already operating the GCETS. The GCETS uses a primary
extraction well for hydraulic containment of contaminated groundwater. A second extraction well serves
as a backup when the primary well is shut down for service and maintenance. An air stripper system was
initially installed in November 2002 to treat the extracted groundwater. The treatment system was
modified in 2011 and 2012 to replace the original packed tower air stripper with a shallow tray air
stripper. The tower equipment was taken out of service in October 2012, but it remains in place and
available if needed. The GCETS was formally implemented in September 2014.
In October 2017, Alcoa Inc. conducted an optimization evaluation of the GCETS and petitioned the
EPA to modify the GCETS monitoring program. The modified GCETS monitoring program was
approved by the EPA in March 2018. Alcoa Inc. is currently operating the GCETS in accordance with
the RD/RA Work Plan, as modified, and SMP Volume II.
The majority of the treated effluent water from the GCETS is used by the facility, while a portion is
discharged to the Mississippi River. The effluent discharge is regulated by the IDNR under the plant's
existing NPDES permit (Number 82-78-1-00). Compliance with the NPDES permit requires sampling of
the treated effluent water and submitting the results to the IDNR in discharge monitoring reports. A
summary of effluent sampling data is provided to the EPA in semiannual progress reports. The
semiannual progress reports also include data from influent water samples and effluent water samples
that are collected monthly to monitor the effectiveness of the air stripper system.
Source Area Remediation
Source area remediation involves the active collection and disposal of subsurface non-aqueous phase
liquid from areas within the Alcoa facility wherever technically feasible. PCB-contaminated oil seeps
through the sidewalls of various pits and an electrical basement. The PCB-contaminated oil is collected
during routine maintenance and disposed of in accordance with the Alcoa facility's PCB Management
Plan, which is updated annually.
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Long-term Groundwater Monitoring
The LTMP was originally approved with the RD/RA Work Plan in 2011. The LTMP was formally
implemented in September 2014 (Appendix G, Table 2-3). In October 2017, Alcoa Inc. petitioned the
EPA to modify the LTMP monitoring program. The EPA approved the modifications to the LTMP
monitoring program in March 2018. The approved changes reduced the frequency for groundwater
monitoring from quarterly to semiannually with sampling scheduled for March and September of each
year. Alcoa Inc. is currently implementing the LTMP in accordance with the RD/RA Work Plan, as
modified, and the SMP Volume III.
The objective of the LTMP monitoring program is to: a) monitor the effectiveness of the groundwater
containment system and to track the movement of groundwater contaminants; b) monitor changes in
chemical constituents and chemical concentrations in the groundwater; c) document compliance with the
groundwater Performance Standards; and d) evaluate any remedial progress over time.
A description of current, ongoing groundwater sampling activities, including the rationale for the
selection of sampling parameters, is presented in Appendix G, Table 2-4, and groundwater monitoring
locations are presented in Appendix H, Figure 2-4. The ongoing groundwater monitoring program at the
Alcoa Site includes 56 monitoring wells. Alcoa Inc. takes water level measurements from all 56
monitoring wells and collects groundwater samples from 40 of them. Sampling is presently conducted
on a semiannual schedule, and the results are reported to the EPA concurrently with semiannual
groundwater monitoring reports.
The LTMP outlines the process for implementing certain contingency activities. If any contaminant in
Appendix G, Table 2-1, is detected above performance standards in groundwater outside the TI zone,
Alcoa Inc. will provide written notification to the EPA of the exceedance(s) when the analytical results
are submitted. Within 30 days of notification, Alcoa Inc. will submit the follow-up action plans to
address the exceedance(s) to the EPA for review and approval. If any contaminant in Appendix G, Table
2-2, is detected above monitoring levels in groundwater outside the TI Zone, Alcoa Inc. will provide
written notification to the EPA of the exceedance(s) when the analytical results are submitted. Following
this notification, the EPA will determine whether additional response actions are necessary.
Short-term Management Plan
In accordance with the 2004 ROD, Alcoa Inc. finalized the Short-Term Management Plan (STMP) dated
October 17, 2011. The STMP describes the land-use restrictions, exposure controls, and potential future
land-use changes for the site property. The STMP is currently being implemented in accordance with the
RD/RA Work Plan, as modified.
Institutional Controls
As stated in the 2004 ROD, the selected remedy for the Alcoa Site includes the use of ICs to prohibit the
installation of any water supply wells for domestic purposes at the Alcoa facility; to assure the site
property is used only for industrial purposes; and to continue the listing of the Alcoa Site on the Registry
of Hazardous Waste or Hazardous Substance Disposal Sites pursuant to Iowa Administrative Code
455B.426. ICs are summarized in the table below.
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Summary of Institutional Controls
Institution!il Control
(K )
Impacted
I'siitcKs)
()hjecti\e
Instrument
Stiitus
Prohibit the installation
of any water supply
wells for domestic
purposes
See
Appendix I
Restrict cross
connecting a
residential
groundwater supply
with the city water
supply
Originally, Iowa State
Plumbing Code
641.25.6
Currently, the Iowa
American Water Cross
Connection Program
Completed
To assure the site
property is used only
for industrial purposes
See
Appendix I
Restrict land and
building use
Riverdale local zoning
ordinances
Completed
Prohibit the installation
of any water supply
wells for domestic
purposes
See
Appendix I
Prohibit construction
of drinking water
wells within the entire
fenced boundary of
Alcoa property
Environmental
Protection Easement or
Environmental
Covenant
Completed
To continue listing on
the Registry of
Hazardous Waste or
Hazardous Substance
Disposal Site
See
Appendix I
Prohibit:
(1) any "substantial
change" in property
use without prior
written approval by
the director of IDNR
(2) any sale,
conveyance, or
transfer of title
without IDNR's prior
approval
Registry of Hazardous
Waste or Hazardous
Substance Disposal
Sites: Iowa
Administrative Code
455B.426 and
455B.430
Replaced by
environmental
covenant and
no longer
required
All ICs have been implemented to satisfy the requirements in the 2004 ROD. Zoning restrictions are in
place to restrict land use at the site property to industrial purposes. The ICs to prohibit the installation of
any water supply wells for domestic purposes have been fully implemented. The Iowa American Water
Cross Connection Program restricts cross-connecting a residential groundwater supply with the city
water supply. On April 29, 2019, an environmental covenant to prohibit domestic wells within the site
property was recorded at the Scott County Recorder's Office (Appendix I). IDNR removed the Alcoa
Site from the Registry of Hazardous Waste or Hazardous Substance Disposal Sites for the state of Iowa
on December 31, 2018 (Appendix I). See I.A.C. 455B.426.
System Operation and Maintenance
Alcoa Inc. operates the GCETS in accordance with the SMP Volume II. The performance of the GCETS
is monitored by sampling the treated effluent groundwater for the parameters in Appendix G, Tables 2-5
and 2-6. The results are submitted to the EPA and IDNR in progress reports. In March 2018, the EPA
approved a proposal by Alcoa Inc. to reduce the reporting from quarterly to semiannually.
Historically, the GCETS utilized PW-06 as the primary groundwater extraction well. In 2008, PW-06
had decreased pumping efficiency and was taken out of service and properly sealed. PW-07 replaced
PW-06 and served as the primary groundwater extraction well until December 2020. In December 2020,
PW-07 had reduced flow rates and was taken off-line for evaluation and potential rehabilitation. The
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backup well, PW-05, was activated to become the primary groundwater extraction well. PW-05 is
currently serving as the primary well, and PW-01 serves as the backup. This change has caused a shift in
the groundwater flow direction towards PW-05, but groundwater monitoring data collected after PW-05
was placed into service indicates that the GCETS is performing as designed to capture the contaminant
plume.
MRP 15 Site
Basis for Taking Action
For the MRP15 Site, the COPCs and COPECs were originally identified in the Human Health Risk
Assessment Report dated May 2000 and the Ecological Risk Assessment Report dated November 2002.
The only COPCs and COPECs carried forward as performance standards for the MRP15 Site are PCBs
in fish tissue.
The human health risk assessment evaluated risk to human health based on the following exposure
scenarios: shoreline trespasser, recreational boat fisherman, and recreational shoreline fisherman. The
risk assessment concluded that there were no significant risks to shoreline trespassers, but there was an
unacceptable risk to recreational boat fisherman and recreational shoreline fisherman based on fish
consumption.
The ecological risk assessment concluded that there were no significant risks to carnivorous birds and
mammals. Potential risk to benthic invertebrates was identified on a localized basis, but the ecological
significance of the potential risk appeared to be minimal because of the small size of the area and the
anticipated further reductions in contaminant concentrations.
Response Actions
Pre-ROD activities at the MRP 15 Site include the following:
• In 1989, IDNR issued a Fish Consumption Advisory for carp on the Iowa side of the MRP 15
Site.
• In April 1990, IDNR issued a second Fish Consumption Advisory for carpsuckers (also referred
to as white carp).
• The 1990 AOC required biennial fish sampling from specified locations at the MRP 15 Site, a
sediment investigation in on-site drainage ways (including the adjacent wetland) at the Alcoa
Site, and sediment investigations at the MRP 15 Site.
RAOs for Selected Remedy
The RAOs for the MRP15 Site are to: 1) reduce PCB concentrations in fish to levels that are protective
of human health and the environment; and 2) monitor natural recovery processes, including sediment
depositional processes, to evaluate the potential for future exposures to contaminated sediments.
Remedy Components
The selected remedy for the MRP 15 Site is monitored natural recovery (MNR) with management of
on-site media on the Alcoa Site property.
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The RD/RA Work Plan specified the performance standards for PCBs in fish tissue as 226 micrograms
per kilogram (|ig/kg) for channel catfish and 231 |ig/kg for common carp.
Status of Implementation
The MNR Program Plan (MNRPP) was approved in conjunction with the RD/RA Work Plan in 2011; it
specified the fish tissue sampling and sediment monitoring requirements for the MRP15 Site. The
MNRPP originally included analysis of shoreline succession, but the analysis is no longer used as a
sediment monitoring tool because shoreline succession was more indicative of changing river stages
than sedimentation processes. The MNRPP is currently being implemented in accordance with the
RD/RA Work Plan.
In 2016, IDNR published a Fish Consumption Advisory advising the public not to eat more than one
meal per week of common carp greater than 20 inches in length from the MRP15 Site. IDNR based the
advisory on data from fish tissue sampling they conducted in 2014, and the baseline fish tissue sampling
conducted by Alcoa Inc. in 2012. The advisory was issued independently by IDNR and is not a
component of the remedy at the MRP 15 Site.
Fish tissue sampling has been conducted at the MRP15 Site at various times since 1983. However, the
formal baseline fish tissue sampling event in support of the MNRPP was conducted in 2012. Alcoa Inc.
completed a second round of fish tissue monitoring in September 2016 and submitted the results to the
EPA in a report entitled "The Mississippi River Pool 15 Monitored Natural Program - 2016" dated
January 2017. In August 2018, the MNRPP was subsequently modified to discontinue the monitoring
program. The discontinuation of fish monitoring was based on an evaluation of the data collected in
September 2016, which indicated that the PCB concentrations in fish at the MRP 15 Site were declining
in trend, statistically equal or lower than fish at reference areas and below performance standards.
The MNRPP specifies sediment monitoring (Appendix H, Figure 2-5) be conducted during the fourth
year of each FYR period. Sediment monitoring includes two specific field tasks: tree line surveys and
sediment elevation measurements. Baseline tree line surveys were conducted in 2003 and 2012, and
baseline sediment elevation measurements were collected in 2012. Sediment monitoring is ongoing with
the most recent event completed in October 2020, and the results reported to the EPA in the Site
Monitoring Report dated December 29, 2020. The results of sediment monitoring indicate that the river
shoreline is not receding and the MNRPP remedy is performing as designed to prevent further
migrations of PCBs into the river.
Alcoa Inc. completed the Mississippi River Pool 15 Interim Remedial Action Report - 2017 dated
December 2017. The report designates the end remedial action phase of the MNRPP remedy and the
beginning of the long-term monitoring phase.
System Operation and Maintenance
The MRP15 Site does not require active remediation; therefore, O&M is not required.
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III. PROGRESS SINCE THE LAST REVIEW
Alcoa Site
Issues/Recommendations
Ol (s) without Issues/Recommendations Idcnlil'icd in the Previous l-ive-Year Ueview:
None
Issues and Recommendations Identified in the l-ive-Year Ueview:
Alcoa Site
Issue Category: Monitoring
Issue: The vapor intrusion pathway has not been fully evaluated.
Recommendation: A vapor intrusion assessment should be performed in
buildings on the Alcoa Site property.
Affect Current
Protectiveness
Affect Future
Protectiveness
Party
Responsible
Oversight
Party
Milestone Date
No
Yes
PRP
EPA/State
9/30/2019
Alcoa Inc. performed a vapor intrusion (VI) assessment of the facility to address this issue. The VI
assessment included two field sampling events and a chemical product inventory of the facility. Field
sampling activities were performed under the Phase IVI Work Plan dated August 2018, as modified by
an addendum dated February 4, 2019.
The VI sampling events were performed in October/November 2018 and March/April 2019. The first VI
sampling event involved a building inspection and sub-slab vapor screening and sampling from areas in
the facility where VOCs were stored, regularly used, or potentially released (Appendix H, Figure 3-1).
Small holes were drilled through the facility floor and screened with a photoionization detector (PID).
Passive vapor samplers were deployed to collect analytical data at locations where PID readings
indicated elevated levels of VOCs. The data from the first round of sub-slab sampling indicated that
VOCs were potentially present to the northwest and northeast of the initial sampling area.
The second VI sampling event was performed in March/April 2019 to collect sub-slab samples from the
areas to the northwest and northeast of the initial sampling area that needed further investigation. The
Phase IVI Work Plan was modified with an addendum dated February 4, 2019, and a second sampling
event was performed in March/April of 2019 to collect analytical data from the newly found areas. The
results of the sub-slab sampling are presented in Appendix G, Table 3-1 and Appendix H, Figures 3-2
thru 3-4.
The VI assessment included pressure differential monitoring to measure the potential air flow from
beneath the building. Pressure differential data were collected in October 2018, February/March 2019
and March/April 2019 (Appendix G, Table 3-2).
Following the sub-slab sampling events, a chemical product inventory was conducted to evaluate
potential indoor sources of VOCs in the facility. An inventory was taken of chemicals used as part of
normal plant operations. The inventory consisted of two steps. The first step was a review of the Safety
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Data Sheets (SDS) for all the chemicals used at the facility, and the second step was a walkthrough of
the facility to record the chemicals in use. Alcoa Inc. completed the SDS review in August 2019 and the
walkthrough in October 2019 (Appendix G, Table 3-3).
As recommended by the previous FYR, Alcoa Inc. completed a VI assessment of the facility. The results
of the VI assessment were reported to the EPA in the Alcoa Site Vapor Intrusion Investigation Report
dated July 2020. These results are discussed in Sections IV and V of this FYR report. The issue has been
addressed and will not be carried forward.
Alcoa Site
Issue Category: Institutional Controls
Issue: An IC to prohibit the installation of any water supply wells for
domestic purposes has not been implemented on the site property.
Recommendation: An environmental covenant should be implemented on
the site property to prohibit the installation of any water supply wells for
domestic purposes.
Affect Current
Protectiveness
Affect Future
Protectiveness
Party
Responsible
Oversight
Party
Milestone Date
No
Yes
PRP
EPA/State
9/30/2019
Alcoa Inc. recorded an environmental covenant to prohibit domestic wells within the site property to
address the issue. The environmental covenant was recorded at the Scott County Recorder's Office on
April 29, 2019 (Appendix I). IDNR removed the Alcoa Site from the Registry of Hazardous Waste or
Hazardous Substance Disposal Sites for the state of Iowa on December 31, 2018 (Appendix I). See
I. A C. 455B.426. The issue has been addressed and will not be carried forward.
MRP 15 Site
MRP15
Issue Category: Monitoring
Issue: Sediment monitoring was not conducted because of elevated river
stages.
Recommendation: The evaluation of sediment bed stability in areas along
the shoreline near the Alcoa facility and in the adjacent wetland should be
conducted.
Affect Current
Protectiveness
Affect Future
Protectiveness
Party
Responsible
Oversight
Party
Milestone Date
No
Yes
PRP
EPA/State
9/30/2019
Alcoa Inc. completed sediment monitoring in September 2017 to address the issue. The MNRPP
specifies sediment monitoring be conducted during the fourth year of each FYR period. Sediment
monitoring is ongoing with the most recent event completed in October 2020, and the results reported in
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the EPA in the Site Monitoring Report dated December 29, 2020. The results of sediment monitoring
indicate that the river shoreline is not receding, and the MNRPP remedy is performing as designed to
prevent further migrations of PCBs into the river.
As recommended by the previous FYR, Alcoa Inc. is conducting sediment monitoring in accordance
with the MNRPP. The issue has been addressed and will not be carried forward.
IV. FIVE-YEAR REVIEW PROCESS
Community Notification, Involvement & Site Interviews
A public notice was made available by a newspaper posting in the Quad-City Times on June 20, 2021
(Appendix I). The Quad-City Times is a local newspaper that serves the Davenport and Bettendorf areas.
The public notice stated that there was an ongoing FYR and invited the public to submit any comments
to the EPA. The results of the FYR and this FYR report will be made available through the EPA's
internet-based information repository, which can be accessed by the public through the following
websites:
• www.epa.gov/superfund/mississippiriverpooll5
• www.epa.gov/superfund/alcoadavenport
Interviews
During the FYR process, interviews were conducted to document any perceived problems or successes
with the remedies that have been implemented to date. Interviews were conducted with the following
people:
• Pat Cook, Supervising Contractor, Tetra Tech;
• Matt Culp, Senior Environmental Specialist, IDNR,;and
• John Riches, Communications & Public Affairs Manager, Alcoa Inc.
None of the interviewees noted any issues or concerns which may impact the protectiveness of the
remedies. Copies of the interview records are provided in Appendix F, Interview Record.
Data Review
The FYR evaluated data to assess the effectiveness of the remedies at both sites. Data collected in the
previous five years (from March 2017 to the present) were analyzed, along with historical sampling
data, to track progress towards attaining RAOs. A list of site-related documents reviewed during this
FYR is provided in Appendix A.
Data Review (Alcoa Site)
The LTMP component of the RD/RA Work Plan, as modified, provides a detailed description of the
required sampling and monitoring activities, and the 2007 ESD sets forth the performance standards for
the Alcoa Site. Sampling data were compared to performance standards for VOCs, SVOCs and PCBs
and monitoring levels for inorganics to track progress towards meeting RAOs.
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The LTMP, within the SMP, prescribes the following contingency actions for exceedances of
performance standards:
"For the Alcoa Site, if groundwater outside the TI Zone is found to contain any contaminant in Table 2-
1 above the groundwater Performance Standard, or treated effluent discharge is found to contain any
contaminant in Table 2-3 above the effluent Performance Standard, Arconic will provide notification of
the exceedance(s) to EPA with the analytical results submittal. Then, within 30 days of the notification,
Arconic will submit for EPA review and approval follow-up action plan(s) that addresses the
exceedance(s). In addition, if groundwater outside the TI Zone is found to contain any contaminant in
Table 2-2 above the monitoring level, or treated effluent discharge is found to contain any contaminant
listed in Table 2-4, Arconic will provide notification of the situation to EPA with the analytical results
submittal. Following the notification, and submittal of follow-up action plan(s) if needed, EPA will
determine if additional response actions are necessary as described in the SOW."
Groundwater Flow
Potentiometric surface maps from groundwater monitoring, conducted from March 2017 to September
2021 (Appendix H, Figures 4-1 thru 4-33), were used to analyze groundwater flow in the shallow
bedrock, intermediate bedrock, and deep bedrock units at the Alcoa Site. The potentiometric maps from
the most recent monitoring round (September 2021) were used to evaluate the current conditions, while
all monitoring rounds were used to monitor potential changes in groundwater flow over time. The
analysis was focused on the portions of the contaminated groundwater plume with specific RAOs in the
2004 ROD.
The primary extraction well for the GCETS was changed during the FYR period. PW-07 served as the
primary extraction well at the beginning of the FYR period until December 2020. In December 2020,
PW-07 had reduced flow rates and was taken off-line for evaluation and potential rehabilitation. The
backup well, PW-05, was activated to become the primary groundwater extraction well. PW-05 is
currently serving as the primary well.
The groundwater flow analysis was based on the general concepts that groundwater flows from higher
hydraulic head (indicated by higher groundwater elevations) towards lower hydraulic head (indicated by
lower groundwater elevations) and that groundwater flow towards the primary extraction well indicates
capture. The groundwater elevations in all three bedrock units, specifically at monitoring wells near the
northwestern boundary and along the east boundary, were higher than at PW-07 from March 2017 to
August 2020 and at PW-05 in March 2021 and September 2021. The difference in groundwater level
elevations indicates that PW-07 and PW05 sufficiently captured the contaminated groundwater plume
throughout the TI zone throughout the FYR period.
The potentiometric maps along the river shoreline in the unconsolidated zone/shallow bedrock units are
provided in Appendix H, Figures 4-34 thru 4-44. During the September 2021 monitoring event, the
water level elevation of the Mississippi River was higher than groundwater elevations in the
unconsolidated zone at five monitoring wells and lower at five monitoring wells. In the
unconsolidated/shallow bedrock unit, groundwater elevations were higher than the river for one well and
below the river for one well. One well (GM-05) was dry and could not be evaluated. Groundwater flow
along the river shoreline is away from the river and towards the primary extraction well for the GCETS
for five monitoring wells. At five monitoring wells, groundwater flow is influenced by both the
extraction well and the river. Groundwater elevations remained consistent for all rounds.
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Groundwater Monitoring
The monitoring wells at the Alcoa Site are grouped into the following five locations: upgradient, plant
interior, western facility boundary, river shoreline and eastern facility boundary. Monitoring wells at the
upgradient and plant interior locations are only used to measure groundwater levels, and analytical
samples were not collected in those two areas. The data review evaluated analytical results from
groundwater sampling at the western facility boundary, river shoreline and eastern facility boundary
locations, conducted from March 2017 to September 2021 (Appendix G, Tables 4-1 thru 4-11).
VOCs
Western Facility Boundary
During the FYR period, 13 monitoring wells were sampled along the western facility boundary. Seven
monitoring wells [ED, ES, HX, LNI LS(S), WA-01I, WDS-2 and WDS-3] did not have any VOC
concentrations exceeding performance standards.
Benzene exceeded the performance standard of 5 |ig/L at one monitoring well (EI) as high as 990 |ig/L.
The source of benzene is suspected to be a petroleum tank farm not associated with Alcoa Inc. The tank
farm is located off the site property but immediately adjacent to EI.
Three monitoring wells [HS(S), PA-14S and PA-17S] had exceedances of cis-l,2-dichloroethene (cis-
1,2-DCE), tetrachloroethene (PCE), trichloroethene (TCE) and vinyl chloride above the performance
standards of 790 |ig/L, 5 |ig/L, 5 |ig/L and 2 |ig/L, respectively. PA-17S also had exceedances of 1,1-
dichloroethene (1,1-DCE) above the performance standard of 7 |ig/L as high as 7.3 |ig/L, and HNI had a
detection of vinyl chloride equal to the performance standard (2 |ig/L).
During the FYR period, the highest concentrations of VOCs were found at PA-17S located near the
northwester property boundary just inside the TI Zone. This area was impacted by historical releases of
VOCs from two PCE aboveground storage tanks, which have been removed. Concentrations at PA-17S
were as high as 7.3 |ig/L for 1,1-DCE; 120 |ig/L for cis-l,2-DCE; 4200 |ig/L for PCE; 970 |ig/L for
TCE; and 18 |ig/L for vinyl chloride.
Trend graphs of the primary VOCs (cis-l,2-DCE, PCE, TCE and vinyl chloride) in monitoring wells
near the northwestern property boundary [HNI, HS(S), LNI, PA-14S and PA-17S] are provided in
Appendix H, Figures 4-45 thru 4-49. The graphs include concentrations observed in the monitoring
wells during the RI to evaluate changes over a longer timeframe. Since the RI, concentrations of PCE
and TCE have declined in monitoring wells HNI, HS(S) and PA-14S and have not increased in PA-17S.
Concentrations of cis-l,2-DCE have also declined in wells HNI, HS(S), PA-14S and LNI and have not
increased in PA-17S. During the FYR period, concentrations of cis-l,2-DCE, PCE and TCE have not
increased in HNI, HS(S), LNI, PA-14S and PA-17S. Vinyl chloride, which was not frequently detected
during the RI, has been present at detectable concentrations in HNI, HS(S), PA-14S and PA-17S during
the FYR period.
All exceedances of 1,1-DCE; cis-l,2-DCE; PCE; TCE; and vinyl chloride performance standards
occurred at monitoring wells [HNI, HS(S), PA-14S and PA-17S] located within the TI Zone.
Compliance points LNI and LS(S) are located outside the TI Zone to the southwest of PA-14S and
northwest of PA-17S. Groundwater flow in this area and throughout the TI zone is towards the primary
extraction well. Therefore, LNI and LS(S) are hydraulically upgradient to PA-14S and PA-17S. LNI had
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detections of acetone, cis-l,2-DCE and TCE, and LS(S) had detections of acetone, toluene and TCE.
None of the detections at LNI and LS(S) exceeded performance standards, which indicates that VOCs
detected in PA-14S and PA-17S are not migrating from the TI zone along the western boundary.
River Shoreline
The river shoreline locations consist of 18 monitoring wells within the TI Zone. Thirteen monitoring
wells (AD, AI, AX, GM-04R, GM-06R, JI, JS, JX, KD, KI, KS, LBD-01D and WDS-5) did not exceed
VOC performance standards. The remaining five monitoring wells exceeded the performance standard
for vinyl chloride (2 |ig/L) as high as 8.6 |ig/L at ANS, 11 |ig/L at AS, 11 |ig/L at EDS-2 |ig/L, 2.8 |ig/L
at GM-09, and 2.1 |ig/L at GM-10. No other VOCs exceeded performance standards along the river
shoreline. Alcoa Inc. notified the EPA of the exceedances of vinyl chloride in the progress reports. Since
the exceedances of vinyl chloride were within the TI Zone, no additional contingency actions are
required by the SMP. Sampling for vinyl chloride will continue to follow the modified LTMP, which
was approved by the EPA in March 2018, described in Appendix G, Table 2-4.
Eastern Facility Boundary
The eastern facility boundary locations consist of eight monitoring wells outside the TI Zone. No
exceedances of VOC performance standards occurred during the FYR period, which indicates that
VOCs are not migrating from the TI Zone along the eastern boundary.
SVOCs
Sitewide
SVOC concentrations did not exceed performance standards during the FYR period in monitoring wells
for all three areas (western facility boundary, river shoreline and eastern facility boundary).
PCBs
Western Facility Boundary
PCB concentrations did not exceed performance standards during the FYR period in monitoring wells at
the western facility boundary locations.
River Shoreline
Along the river shoreline, PCB concentrations did not exceed performance standards at 11 monitoring
wells (AD, AI, AX, EDS-2, JI, JX, KD, KI, KS, LBD-01D and WDS-5) and exceeded performance
standards at seven monitoring wells (ANS, AS, GM-04R, GM-06R, GM-09, GM-10 and JS). The
highest exceedances of Aroclor-1242 and Aroclor-1248 were 17 |ig/L and 220 |ig/L, respectively, at
GM-10.
When compared to data collected during the prior FYR period (2014-2016), exceedances of PCBs
during the current FYR period were within the prior range (i.e., below the highest levels from the
previous FYR) at four monitoring wells (AS, GM-04R, GM-06R and GM-09) and above the prior range
(i.e., above the highest levels from the previous FYR period) at three monitoring wells (ANS, GM-10
and JS). The number of sampling rounds where PCBs were higher than the prior FYR period were four
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of 11 sampling rounds at ANS, one of 11 sampling rounds at GM-10 and one of seven sampling rounds
at JS.
Alcoa Inc. notified the EPA of the exceedances of PCBs in the progress reports. Since the exceedances
of PCBs were within the TI Zone, no additional contingency actions are required by the SMP. Sampling
for PCBs will continue to follow the modified LTMP, as described in Appendix G, Table 2-4.
Eastern Facility Boundary
Along the eastern facility boundary, Aroclor-1248 was detected above performance standards in August
2020 at NS (1.1 ju.g/1). NS is located outside the TI Zone boundary by about 150 feet. Subsequent
progress reports by Arconic note the following lines of evidence indicating no increased risk:
• As noted in the ROD, the groundwater risk assessment did not evaluate groundwater along the
river shoreline because there are no receptors;
• The Environmental Covenant recorded at the Alcoa Site prohibits the use of groundwater for
drinking or other domestic purposes; and
• The vertical gradients in this area show a downward flow from the shallow bedrock groundwater
to the intermediate bedrock zone, where groundwater is captured by the operation of the GCETS.
The August 2020 event was the first time that PCBs were detected in NS. The groundwater monitoring
program for subsequent events was modified to include sampling for PCBs at NS. In March 2021,
Aroclor-1248 was detected below performance standards at NS (0.086 ju.g/1). NS was inadvertently not
sample during the September 2021 event.
Inorganics
Sitewide
During this FYR period, concentrations of arsenic above the monitoring levels of 10 |ig/L were found at
eight monitoring wells as high as 10 |ig/L at HS(S), 11 |ig/L at ANS, 26 |ig/L at AS, 45 |ig/L at GM-
04R, 15 |ig/L at GM-06R, 24 |ig/L at GM-09, 27 |ig/L at GM-10 and 14 |ig/L atNS. Detections of
arsenic were within the TI Zone, except NS. With the exception of NS, the exceedances of arsenic were
within the TI Zone; therefore, no additional contingency actions are required by the SMP. Sampling for
arsenic will continue to follow the modified LTMP, as described in Appendix G, Table 2-4.
When compared to data collected during the prior FYR period (2014-2016), exceedances of arsenic
during the current FYR period were within the prior range (i.e., below the highest levels from the
previous FYR) at five monitoring wells (ANS, GM-06R, GM-09, GM-10 and NS) and above the prior
range (i.e., above the highest levels from the previous FYR period) at three monitoring wells (HS(S), AS
and GM-04R). The number of sampling rounds where arsenic was higher than the prior FYR period
were one of four sampling rounds at HS(S), AS and GM-04R.
Concentrations of iron above the monitoring level of 4,900 |ig/L and manganese above the monitoring
level of 300 |ig/L were found at 22 and 17 monitoring wells, respectively. Iron and manganese data
indicate that both metals are ubiquitous (i.e., naturally occurring) across the Alcoa Site. No additional
follow-up actions are required for iron and manganese by the SMP. Sampling for iron and manganese
will continue to follow the modified LTMP, as described in Appendix G, Table 2-4.
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Concentrations of thallium above the monitoring level of 0.5 |ig/L were found at four monitoring wells
as high as 0.52 at WA-01I, 0.6 |ig/L at OID (intermediate zone), 0.72 |ig/L at OID (deep zone) and 3
|ig/L at OS. All four monitoring wells are located outside the TI Zone. Since the exceedances of
thallium were within the TI Zone, no additional contingency actions are required by the SMP. Sampling
for thallium will continue to follow the modified LTMP, as described in Appendix G, Table 2-4.
Concentrations of vanadium above the monitoring level of 7 |ig/L were detected at two monitoring wells
as high as 9.1 |ig/L at AS and 14 |ig/L at KS. AS and KS are located along the river shoreline and within
the TI Zone. Since the exceedances of vanadium were within the TI Zone, no additional follow-up
actions are required by the SMP. Sampling for vanadium will continue to follow the modified LTMP, as
described in Appendix G, Table 2-4.
FWDS Product
Fluid-level elevations were obtained from the collection manholes located in the oil interception trench
at the FWDS (Appendix H, Figures 2-2). None of the manholes contained any measurable product
during this FYR period, which indicates that oil from the FWDS is not migrating away from the site
property.
Groundwater Containment with Extraction and Treatment
The primary extraction well for the GCETS was PW-07 until December 2020. In December 2020, PW-
07 had reduced flow rates and was taken off-line for evaluation and potential rehabilitation. The backup
well, PW-05, was activated to become the primary groundwater extraction well. PW-05 is currently
serving as the primary well, and PW-01 serves as the backup. From January 2017 to November 2020,
the monthly volume of groundwater extracted by PW-07 ranged between 7,135,000 gallons and
9,844,000 gallons with a monthly average of 8,743,000, and the flow rate at PW-07 ranged between 161
gallons per minute (gpm) and 221 gpm and averaged 199 gpm. From December 2020 to October 2021,
the monthly volume of groundwater extracted by PW-05 ranged between 7,501,000 gallons and
9,843,000 gallons with a monthly average of 9,081,000, and the flow rate at PW-05 ranged between 174
gpm and 221 gpm and averaged 207 gpm (Appendix G, Table 4-12).
Influent
Samples of the influent groundwater are analyzed monthly for VOCs. From January 2017 to October
2021, VOCs were detected in the influent, including PCE, TCE, cis-l,2-DCE and vinyl chloride. VOC
detections are listed in Appendix G, Table 4-13.
Effluent
From January 2017 to October 2021, the GCETS extracted and treated approximately 511 million
gallons of groundwater. Effluent water samples are collected on a monthly basis and analyzed for
VOCs, PCBs, PAHs and select inorganic compounds. No performance standards were established for
treated effluent water other than PCE, TCE and cis-l,2-DCE. Alcoa Inc. is required to report any
detections of the effluent monitoring parameters (Appendix G, Table 2-4). For the reporting period
January 2017 to October 2021, no performance standards were exceeded for effluent water. However,
effluent water samples contained low levels of several inorganics during each monthly sampling event.
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Data Review (MRP15 Site)
Fish Tissue Sampling
Prior to the FYR period, baseline fish tissue sampling was conducted in September 2012, and
subsequent sampling was performed in September 2016. The target fish species were common carp and
channel catfish. The objectives of the fish tissue monitoring program were to:
1) Evaluate trends of PCB concentrations in fish tissue collected from the MRP15 Site and
reference areas;
2) Compare fish tissue PCB concentrations collected from areas adjacent to the Alcoa facility to
PCB concentrations of fish collected from representative reference areas; and
3) Evaluate fish tissue concentrations for the protection of human health and the environment; that
is, comparison with fish tissue performance standards. The performance standard for channel
catfish is 226 |xg/kg, and for common carp is 231 |J.g/kg.
Trends in fish tissue PCB concentrations were evaluated by examining graphical representations of total
PCB concentrations in fish tissue from 1990 to 2016 (Appendix H, Figures 4-50 thru 4-53). The
following conclusions were drawn:
• Concentrations of total PCBs in channel catfish tissue for the MRP15 Site in 2016 were the
lowest among all monitoring events since 1990. Declining trends in total PCBs were also
apparent when examined on a site-by-site basis (Sites 2, 3 and 4).
• Concentrations of total PCBs in common carp show a relatively rapid decline between 1992 and
1998. An increase was noted from 1998 to 2012, which is likely the result of larger fish with
higher lipid concentrations. During the 2016 study, the concentration of total PCBs in common
carp were lower than all previous survey periods and below the performance standard.
Fish tissue PCBs measured in common carp and catfish at the MRP15 Site were statistically compared
with tissue PCBs in common carp and catfish collected from the combined reference areas. Reference
area data were combined between Site 1 and Site 7 as there was no statistically significant difference in
PCB concentrations between the two areas in either common carp or channel catfish. The following
conclusions were drawn:
• Channel catfish - The concentrations of total PCBs in channel catfish at the MRP15 Site are
statistically equal to or less than total PCBs in channel catfish collected from the reference areas.
• Common carp - The concentrations of total PCBs in common carp at the MRP 15 Site are
statistically equal to or less than total PCBs in channel catfish collected from the reference areas.
The performance standards are risk-based concentrations used for comparison with the 95% UCL of the
mean total PCB concentration in tissue from fish within the target size range. The following conclusions
were drawn from that comparison:
• Channel catfish - The mean total PCB concentration in channel catfish at the MRP 15 Site (84
(j,g/kg) is well below the Performance Standard of 226 [ig/kg, and only two of 29 individual
channel catfish exceeded the Performance Standard. The 95% UCL total PCB concentration in
channel catfish fillet tissue at the MRP15 Site was estimated as 101 [ig/kg, and is also below the
performance standard.
• Common carp - The mean and 95% UCL total PCB concentrations in common carp at the
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MRP15 Site were 117 |xg/kg and 138 |xg/kg, respectively, both of which are well below the
performance standard for common carp of 231 ng/kg. Only one of 24 individual fish exceeded
the performance standard.
In addition to the performance standards noted above, FWS expressed concern relative to PCB
associated risks to mink in the vicinity of Duck Creek. PCBs in common carp and channel catfish tissue
were used to estimate PCB concentrations in forage fish, specifically gizzard shad and emerald shiner,
using ratios relative to historical concentrations. Gizzard shad and emerald shiner were evaluated as
forage fish in the mink diet consistent with the ecological risk assessment, resulting in a no-adverse-
effect Environmental Endangerment Quotient of 0.6. The results indicate that residual PCBs in MRP15
are unlikely to pose risks to mink.
No fish tissue sampling was performed during the current FYR period. In December 2017, Alcoa Inc.
proposed to modify the MNRPP for the MRP15 Site to discontinue fish monitoring activities, and EPA
approved the modification in August 2018. The approval was based on an evaluation of the most recent
fish tissue data collected in September 2016 which indicate that the PCB concentrations in fish at the
MRP 15 Site are declining in trend, statistically equal or lower than in fish at reference areas and below
performance standards. By attaining performance standards, the remedy at the MRP 15 Site has achieved
the RAO to reduce PCB concentrations in fish to levels that are protective of human health and the
environment.
Sediment Monitoring
The remedy at the MRP 15 Site includes sediment monitoring to evaluate natural recovery processes and
the potential for future exposures to contaminated sediments. Monitoring activities are described in the
Volume IV of the Site Management Plan for the Alcoa and MRP15 Sites dated May 2019. The goals of
the MRP 15 monitoring plan are, as follows:
• Field documentation of tree line/vegetation documented using global positioning system
mapping. Use of aerial photography to supplement field documentation of tree line/vegetation
succession; and
• Field observations of potential erosive activities documented with photograph evidence.
During the current FYR period, monitoring activities were performed at the MRP 15 Site in September
2017 and October 2020. Tree line delineation was performed, and sediment elevation measurements
were taken from the following three areas, along the west bank of the Mississippi River and adjacent to
the Alcoa facility (Appendix H, Figure 2-5):
1) depositional areas adjacent to Arconic Outfall 006;
2) depositional areas downstream of the Arconic water intake (Appendix H, Figure 2-5) to
historical Outfall 004; and
3) depositional areas between Arconic Outfalls 002 and 003.
Tree Line Delineation
Changes in the tree line, along the shoreline of the Mississippi River, provide an indication of
depositional processes over time. Field observations of vegetation at the three monitoring areas are
recorded over time to provide evidence regarding the stability of sediment/soil. A baseline tree line
survey was conducted in the central area downstream from the Alcoa facility's water intake structure in
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2003. Subsequent tree line surveys were conducted on September 15, 2012, and September 6, 2017, in
all three study areas (Appendix H, Figures 4-54 thru 4-56).
The conclusions from the tree delineation are, as follows:
1) Depositional areas adjacent to Outfall 006 - The tree line appears to have remained relatively
static between 2012, 2017 and 2020.
2) Depositional area downstream of the Arconic water intake to Outfall 004 - Prior to 2017, the
tree line in the area remained unchanged. From 2017 to 2020, the tree line expanded slightly.
3) Depositional areas between Outfalls 002 and 003 - The tree line has remained relatively static
between 2012 and 2020.
Field observations were supplemented with aerial photography from the National Agriculture Imagery
Program (NAIP). High resolution aerial NAIP photography 1994 to 2019 (Appendix H, Figures 4-57
thru 4-59) provide further evidence that tree lines have remained stable or expanded in all three
observation areas.
Sediment Survey
Sediment surveys are performed at the three depositional areas along the shoreline of the Mississippi
River. A baseline survey was performed on October 1, 2012. During the FYR period, sediment surveys
were performed on September 6, 2017, and October 7, 2020.
The conclusions from the sediment surveys are, as follows:
1) Depositional areas adjacent to Outfall 006 - From 2017 to 2020, sediment levels remained
stable, and vegetation growth increased.
2) Depositional area downstream of the Alcoa facility water intake to Outfall - From 2017 to
2020, sediment levels remained stable or increased in some areas, and vegetation growth
increased.
3) Depositional areas between Outfalls 002 and 003 - From 2017 to 2020, sediment levels
remained stable or increased in some areas. Vegetation growth was well established and
remained stable.
The results of sediment monitoring indicate that sediment deposition has remained static or increased in
the three study areas.
Site Inspection
An inspection of both Sites was conducted on July 9, 2021. The purpose of the inspection was to assess
the protectiveness of the remedy. A record of the site inspection, including photos, can be found in
Appendix D, Site Inspection Checklist and Appendix E, Photographs. In attendance were:
• Hoai Tran (EPA), Remedial Project Manager
• Pat Cook (Tetra Tech), Supervising Contractor
The site inspection assessed the overall maintenance of the Alcoa Site. In December 2020, PW-07 had
reduced flow rates was replaced by the backup well, PW-05. During the site inspection, PW-07
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remained off-line and was still being evaluated, and PW-05 was serving as the primary groundwater
extraction well.
A land-use review indicated that land use remains industrial. No new construction or plant modification
were observed.
Overall, the site inspection concluded that the remedy components were functioning properly and well
maintained. PW-05 was performing at levels equivalent to historical levels at PW-07 (prior to December
2020). No other maintenance issues were identified.
V. TECHNICAL ASSESSMENT
Alcoa Site
Question A: Is the remedy functioning as intended by the decision documents (Alcoa Site)?
The remedy for the Alcoa Site is groundwater containment, which includes the ongoing operation of a
GCETS, source area remediation, groundwater monitoring and ICs. The GCETS was formally
implemented in September 2014 and is currently operating. Source area remediation is performed by
following the PCB Management Plan, and groundwater monitoring is being performed to fulfill the
requirements of the LTMP. The remedy is functioning as intended by the 2004 ROD and in accordance
with the RD/RA Work Plan.
Remedial Action Performance
Groundwater Containment Extraction and Treatment System
Groundwater flow analysis indicates that the GCETS captures deep and intermediate bedrock
groundwater over the entire TI Zone and shallow bedrock groundwater over most of the TI Zone.
Sampling data from influent groundwater and treated effluent water indicate that the air stripper system
is effectively eliminating contamination in extracted groundwater to below performance standards.
System Operations/O&M
During the FYR period, the primary extraction well for the GCETS was PW-07 from July 2017 until
December 2020. In December 2020, PW-07 had reduced flow rates and was taken off-line for evaluation
and potential rehabilitation. The backup well, PW-05, was activated to become the primary groundwater
extraction well. PW-05 is currently serving as the primary well, and PW-01 serves as the backup.
The monthly volume of groundwater extracted by the GCETS (Appendix G, Table 4-12) indicate that
system operations have performed as designed. No equipment breakdowns or changes were identified
that would indicate a potential issue affecting protectiveness. In addition, Alcoa Inc. did not identify any
large variances in operational costs that could indicate a potential problem with the remedy.
Implementation of Institutional Controls and Other Measures
All ICs have been implemented to satisfy the requirements in the 2004 ROD. Zoning restrictions are in
place to restrict land use at the site property to industrial purposes. The ICs to prohibit the installation of
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any water supply wells for domestic purposes have been fully implemented. The Iowa American Water
Cross Connection Program restricts cross connecting a residential groundwater supply with the city
water supply. An environmental covenant to prohibit domestic wells within the site property was
recorded at the Scott County Recorder's Office on April 29, 2019 (Appendix I). On December 31, 2018,
following recording of the covenant, IDNR removed the Alcoa Site from the Registry of Hazardous
Waste or Hazardous Substance Disposal Sites (Appendix I). See I.A.C. 455B.426.
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? (Alcoa Site)
There have been no changes in exposure assumption, toxicity data, cleanup levels, and RAOs that could
affect the protectiveness of the remedy at the Alcoa Site. There have been no changes in the physical
conditions or the land use at the Alcoa Site that would affect the routes of exposure and the
protectiveness of the remedy. Land use on and near the Alcoa Site is not expected to change in the
foreseeable future.
Changes in Standards and TBCs
The 2007 ESD updated and clarified the federal and state chemical-specific ARAR and "to be
considered (TBC)" concentration values for COCs at the Alcoa Site, and established the following
hierarchy for the performance standards and monitoring levels:
1. Federal primary MCL
2. EPA lifetime health advisory levels
3. Iowa statewide groundwater standards
There are no changes in these standards that would call into question the protectiveness of the remedy at
the Alcoa Site.
Changes in Toxicity and Other Contaminant Characteristics
No changes in toxicity and other contaminant characteristics were identified that could affect the
protectiveness of the remedy at the Alcoa Site.
Changes in Risk Assessment Methods
Several changes in risk assessment methodologies have occurred regarding groundwater baseline risk
assessment. No changes in risk assessment methodologies have been identified that could affect the
protectiveness of the remedy at the Alcoa Site.
Changes in Exposure Pathways
The Alcoa facility is an active industrial facility. Land use on and near the Alcoa Site has not changed
and is not expected to change in the foreseeable future. Therefore, no changes in exposure pathways
were identified that could affect the protectiveness of the remedy at the Alcoa Site.
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Vapor Intrusion
The VI pathway was evaluated in 2020. Most volatile COCs detected were identified as components of
chemical products actively used at the Site (Geosyntec, 2020). The chemical products used by Arconic
comply with and are managed under OSHA regulations (OSHA, 2012). As a result of continued use of
these products, background levels of volatile COCs associated with on-site industrial activities could not
conclusively be differentiated from potential vapor intrusion contributions from subsurface
contamination. Sub-slab data included detections of three volatile COCs that were not identified in the
plant inventory: cis-l,2-DCE, 1,1-dichloroethane (DCA), and vinyl chloride. The VI investigation report
notes that 1,1-DCA and vinyl chloride may be trace ingredients in products but not noted on safety data
sheets; therefore, the vapor intrusion contributions of 1,1-DC A and vinyl chloride are equally difficult to
distinguish from industrial process use. Although cis-l,2-DCE may be present as a degradation product
of PCE and TCE in groundwater, this compound does not have a sub-slab soil gas or indoor air
screening level. Additionally, sub-slab to indoor differential pressure monitoring did not indicate a
significant driving force for vapor intrusion in these areas.
Expected Progress Toward Meeting RAOs
The remedy at the Alcoa Site is progressing, as expected, toward meeting RAOs. No new site
conditions have been identified that could impact RAOs and remedy protectiveness.
Question C: Has any other information come to light that could call into question the
protectiveness of the remedy (Alcoa Site)?
No other information has come to light that could call into question the protectiveness of the remedy at
the Alcoa Site.
MRP 15 Site
Question A: Is the remedy functioning as intended by the decision documents? (MPR15 Site)
The selected remedy for the MRP 15 Site is MNR with management of on-site media on the Alcoa site
property. The MNRPP specifies the fish tissue sampling and sediment monitoring requirements for the
MRP15 Site. Alcoa Inc. is implementing the remedy in accordance with the MNRPP and RD/RA Work
Plan, and the remedy is functioning as intended by the 2004 ROD.
Remedial Action Performance
Based on the most recent fish tissue monitoring results from September 2016, PCB concentrations in
fish at the MRP 15 Site have declined and are statistically equal to or less than concentrations at
reference areas and are below performance standards. By attaining the fish tissue performance standards,
the remedy at the MRP 15 Site has achieved the RAO to reduce PCB concentrations in fish to levels that
are protective of human health and the environment.
The sediment monitoring survey performed in October 2020 indicates that sediment deposition has
remained static or increased in the survey areas. The tree line delineation indicates the tree line has
remained relatively static near Outfall 006. The tree line immediately downstream from the Arconic
water intake expanded between 2003 and 2012, and remained relatively unchanged between 2012 and
2017, but increased between 2017 and 2020. Between Outfalls 002 and 003, the tree line appears to have
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remained relatively static between 2012 and 2020. No erosion has occurred and the sediment
environment at the Site remains stable.
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 (MPR15 Site)?
There have been no changes in exposure assumption, toxicity data, cleanup levels and RAOs that could
affect the protectiveness of the remedy at the MRP 15 Site. No changes in the physical conditions or the
land use at the MRP 15 Site that would affect the routes of exposure and the protectiveness of the
remedy (Arconic-Davenport, 2020). Land use on and near the MRP 15 Site is not expected to change in
the foreseeable future.
Changes in Standards and TBCs
No changes in standards and TBCs were identified that could call into question the protectiveness of the
remedy at the MRP 15 Site.
Changes in Toxicity and Other Contaminant Characteristics
No changes in toxicity and other contaminant characteristics were identified that could affect the
protectiveness of the remedy at the MPR15 Site.
Changes in Risk Assessment Methods
No changes in risk assessment methods were identified that could affect the protectiveness of the
remedy.
Changes in Exposure Pathways
No changes in exposure pathways were identified that could affect the protectiveness of the remedy.
Land use on and near the MRP15 Site has not changed and is not expected to change in the foreseeable
future.
Expected Progress Towards Meeting RAOs
The remedy is progressing as expected toward meeting RAOs at the MRP 15 Site.
Question C: Has any other information come to light that could call into question the
protectiveness of the remedy (MRP15 Site)?
No other information has come to light that could call into question the protectiveness of the remedy at
the MRP 15 Site.
VI. ISSUES/RECOMMENDATIONS
Alcoa Site
No issues were identified during the second FYR that would impact the protectiveness of the remedy at
the Alcoa Site.
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Other Findings
Sub-slab concentrations of COCs are significant enough to contribute to the vapor intrusion pathway,
but these contributions cannot be readily distinguished from the contributions of indoor industrial
processes. To the extent reasonable, vapor intrusion contributions from potential sub-slab sources should
be minimized by addressing leaky plumbing, open sumps, floor cracks, and other slab perforations that
might facilitate migration of hazardous vapors from the subsurface to indoor air.
Efforts to rehabilitate PW-07 and establish a backup well for PW-05 should continue.
The Fall 2021 groundwater sampling report indicated that well NS was inadvertently not sampled for
PCBs during September 2021 but will be sampled during the March 2022. At a minimum, well NS also
will need to be sampled in August/September 2022 to more closely approximate seasonal groundwater/
surface water conditions at the time of the Performance Standard exceedance.
Per- and polyfluoroalkyl substances, known as PFAS, are widely used, long lasting chemicals,
components of which break down very slowly over time. There are thousands of PFAS chemicals, and
they are found in many different consumer, commercial, and industrial products. The remedy should
consider whether historical operations at the Alcoa facility may have resulted in the potential release of
PFAS chemicals.
To prepare for potential climate change effects, the Site and remedy should be assessed for potential
climate-related vulnerabilities. Steps to build resiliency should be identified.
MRP 15 Site
No issues were identified during the second FYR that would impact the protectiveness of the remedy at
the Alcoa Site.
Other Findings
To prepare for potential climate change effects, the Site and remedy should be assessed for potential
climate-related vulnerabilities. Steps to build resiliency should be identified.
VII. PROTECTIVENESS STATEMENT
Alcoa Site
Protectiveness Statement(s)
Alcoa Site
Protectiveness Determination:
Protective
Protectiveness Statement:
The remedy at the Alcoa Site
is protective of human health and the environment.
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MRP 15 Site
Protectiveness Statement(s)
MRP 15 Site Protectiveness Determination:
Protective
Protectiveness Statement:
The remedy at the MRP 15 Site is protective of human health and the environment.
VIII. NEXT REVIEW
The next FYR for the Alcoa Site and the MRP15 Site is required five years from the completion date of
this review.
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APPENDIX A
LIST OF DOCUMENTS REVIEWED
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AECOM, 2013. Remedial Design/Remedial Action Work Plan, Volume II: Groundwater Containment
Extraction and Treatment System Plan, Davenport Works, Riverdale, IA, May.
Arconic Inc. 2017. Mississippi River Pool 15: Monitored Natural Recovery Program - 2016 Report,
Arconic-Davenport Works, Iowa. 2017.
Arconic Inc., 2017. Alcoa Site Operational & Functional Report, dated October 2017.
Arconic Inc. 2017. Mississippi River Pool (MRP 15 Site) Interim Remedial Action Report - 2017, dated
December 2017.
Arconic Inc., 2019. Final Remedial Action Report for the Alcoa & MRP15 Sites, dated May 2019.
Arconic Inc., 2019 Site Management Plan Volumes I-V, dated May 2019.
Arconic Inc., 2020. Mississippi River Pool 15 (MRP15) Monitoring Report - 2020, dated December
2020.
City of Riverdale, 2014. Riverdale Zoning Districts [map].
http://riyerdaleia.org/ortlinances/general-mformation/475-riverdale-zoiiing-map-fi.Tial-2014-b
pdfMle. Accessed 8 February 2017.
ENSR, Inc. 2004. Groundwater Feasibility Study Report, Alcoa-Davenport Works, Riverdale, Iowa,May.
Environmental Protection Agency (EPA), 1989. Risk Assessment Guidance for Superfund (RAGS):
Volume 1, Human Health Evaluation Manual (Part A). EPA/540/1-89/002. December.
EPA, 1991. Risk Assessment Guidance for Superfund (RAGS): Volume 1, Human Health Evaluation
Manual (Part B, Development of Risk-Based Preliminary Remediation Goals). EPA/540/R- 92/003.
December.
EPA, 1997a. Health Effects Assessment Summary Tables, FY 1997 Update. EPA-540-R-97-036, July.
EPA, 1997b. Exposure Factors Handbook (1997 Final Report). EPA/600/P-95/002F a-c.
EPA, 2001. Comprehensive Five-Year Review Guidance. EPA/540-R-01-007. Office ofEmergency and
Remedial Response.
EPA, 2003. Human Health Toxicity Values in Superfund Risk Assessment. OSWER Directive 9285.7-
53. December 5.
EPA, 2004a. Record of Decision, Aluminum Company of America Site, Riverdale, Iowa and Mississippi
River Pool 15 Site, near Riverdale, Iowa. September.
EPA, 2004b. Risk Assessment Guidance for Superfund, Volume 1, Human Health Evaluation Manual,
(Part E, Supplemental Guidance for Dermal Risk Assessment), Final: Washington, DC, Office of Solid
Waste and Emergency Response, OSWER Directive 9285.7-02EP, var. pg.
EPA, 2005. Supplemental Guidance for Assessing Susceptibility from Early-Life Exposure to
Carcinogens. EPA/630/R-03/003F, March.
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EPA, 2007. Explanation of Significant Differences for the Aluminum Company of America Site,
Riverdale, Scott County, Iowa. July.
EPA, 2009. Risk Assessment Guidance for Superfiind. Volume I: Human Health Evaluation Manual(Part
F, Supplemental Guidance for Inhalation Risk Assessment). Office of Superfiind Remediation &
Technology Innovation. USEPA-540-R-070-002.
EPA, 2010. Drinking Water Contaminants. Available at:
http://www.epa.gov/safewater/contaminants/index.html.
EPA, 2012. Fact Sheet: Completion of the Remedial Design; Aluminum Company of America Site,
Riverdale, Iowa; Mississippi River Pool 15 Site, Riverdale, Iowa. July.
EPA, 2014a. Human Health Evaluation Manual, Supplemental Guidance, Update of Standard Default
Exposure Factors: Washington, DC, Office of Solid Waste and Emergency Response, OSWERDirective
9200.1-120, var. pg.
EPA, 2014b. Vapor Intrusion Screening Level (VISL) Calculator User's Guide. May. Available at:
www.epa.gov/vaporintrusion/vapor-intrusion-screening-levels-visls.
EPA, 2015a. Handbook for Implementing the Supplemental Cancer Guidance at Waste andCleanup Sites.
Last revised, 2012; Retrieved April. Available at:
http://www.epa.gov/oswer/riskassessment/sghandbook/index.htm.
EPA, 2015b. Integrated Risk Information System (IRIS). Available at:http://www.epa.gov/iris.
EPA, 2016a. EPA_OLEM Vapor Intrusion Assessment - Vapor Intrusion Screening Level (VISL)
Calculator Version 3.5.1 (May 2016, RSLs).
EPA, 2016b. Fact Sheet: EPA Provides Update on Cleanup Action at the Aluminum Company of
America Alcoa and Mississippi River Pool #15 Superfiind Sites; Bettendorf, Scott County, Iowa.October.
EPA, 2016c. Regional screening levels, screening levels for chemical contaminants, RSL tables. EPA
Region 9. Available at: http://www.epa.gov/region09/waste/sfund/prg/index.html.
EPA, 2016d. Vapor Intrusion Screening Level (VISL) calculator v. 3.46. Available at:
https://www.epa.gov/vapor-intrusion.
EPA, 2017a. RSL Calculator. Available at: epa-prgs.ornl.gov/cgi-bin/chemicals/csl search.
EPA, 2017b. Integrated Risk Information System (IRIS). Available at: www.epa.gov/iris.
Geosyntec Consultants, 2020, Alcoa Site Vapor Intrusion Investigation Report, dated July 2020.
Geraghty & Miller, Inc. 1989. Phase HI Ground-Water Monitoring Plan for the Alcoa-Davenport Waste-
Disposal Site, February 1989.
Geraghty & Miller, Inc. 1993. Facility Site Assessment, Alcoa-Davenport Works, Riverdale, Iowa,March.
Geraghty & Miller, Inc., 1996. Risk-Based Concentration Report, 86-inch Continuous Heat Treatment
Line (IPO-03), Alcoa-Davenport Works, CERCLA Consent Order VII-95-F-0026: Dublin, Ohio,
Geraghty & Miller, Inc., 185p.
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Geraghty & Miller, Inc., 1997. Risk-Based Concentration Report, Tetrachloroethene (PCE) Aboveground
Storage Tanks, Alcoa-Davenport Works, CERCLA Consent Order VII-95-F-0026:Dublin, Ohio,
Geraghty & Miller, Inc., 163p.
Geraghty & Miller, Inc., 1998. Risk-Based Concentration Report, Finish Lines Unit Group, Alcoa-
Davenport Works, CERCLA Consent Order VII-95-F-0026: Dublin, Ohio, Geraghty & Miller,Inc.,
182p.
ICF, 1998. Groundwater Remedial Investigation Phase II Field Sampling Plan, Alcoa-DavenportWorks,
Riverdale, Iowa, May 29.
Iowa American Water, 2017. Cross Connection Program: Backflow Prevention & Cross Connection
Control. http://awrnsa.com/files/Iowa CCP.pdf. Accessed 8 February 2017.
Iowa Department of Natural Resources (IDNR), 2017a. 2017 Iowa Fishing Regulations. Available at:
wwwlowadnT.gov/f1shmg.
IDNR, 2017b. Registry of Hazardous Waste or Hazardous Substance Disposal Sites.
http://www.iowadiir.gov/Eiiyiroiimental-Protection/Land-Ouality/Coiitairiiiiated-Sites/Haz- Waste-Sites-
Registry. Accessed 8 February 2017.
Iowa Department of Public Health (IDPH), 2005. Sub-Slab Gas and Air Sampling Data, Alcoa-
Davenport Works, Riverdale, Scott County, Iowa. May.
IT Corporation, 1999. Risk-Based Concentration Report, Former Waste Disposal Site, Alcoa-Davenport
Works, CERCLA Consent Order VII-95-F-0026: Monroeville, PA, IT Corp., 90p.
IT Corporation, 2000. Risk-Based Concentration Report, Ash Pond Storage Area, Alcoa-Davenport
Works, CERCLA Consent Order VII-95-F-0026: Monroeville, PA, IT Corp., 64p.
IT Corporation, 2001a. Risk-Based Concentration, Report Bone Yard Unit Group, Alcoa-Davenport
Works, CERCLA Consent Order VII-95-F-0026: Monroeville, PA, IT Corp., 174p.
IT Corporation, 2001b. Risk-Based Concentration Report, Eastern Historical Disposal Site and Western
Disposal Site Unit Group, Alcoa-Davenport Works, CERCLA Consent Order VII-95-F-0026:
Monroeville, PA, IT Corp., 253p.
IT Corporation, 2001c. Risk-Based Concentration Report, Sewer Unit Group, Alcoa-Davenport Works,
CERCLA Consent Order VII-95-F-0026: Monroeville, PA, IT Corp, 161p.
IT Corporation, 2002. Groundwater Remedial Investigation Report, Alcoa-Davenport Works, Revised
May.
Johnson, P.C. and Ettinger, R.A, 1991. Heuristic Model for Predicting the Intrusion Rate ofContaminant
Vapors into Buildings. Environ. Sci. Technol. 1991,25, 1445-1452.
MFG, Inc., 2004a. Revised Risk-Based Concentration Report, NPDES Outfall 001, Alcoa-Davenport
Works, CERCLA Consent Order VII-95-F-0026: Pittsburgh, Pennsylvania, MFG, Inc., 194p.
MFG, Inc., 2004b. Revised Risk-Based Concentration Report, Outfalls Unit Group, Alcoa-Davenport
Works, CERCLA Consent Order VII-95-F-0026: Pittsburgh, PA, MFG, Inc., 237p.
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Shaw E&I, Inc. 2002. Final Groundwater Remedial Investigation Report, Alcoa-Davenport Works,
CERCLA Consent Order VII-95-F-0026, May.
Tetra Tech, 2011. Remedial Design/Remedial Action Work Plan for the Alcoa-Davenport Works &
MRP 15 Sites, September.
Tetra Tech, 2013. Preferential Flow and Well Installation Report, Alcoa-Davenport Works, January.
Tetra Tech, 2017. First Quarter 2017 Groundwater Monitoring Report, Alcoa-Davenport Works, dated
July 2017.
Tetra Tech, 2017. Second Quarter 2017 Groundwater Monitoring Report, Alcoa-Davenport Works,
dated October 2017.
Tetra Tech, 2018. Third Quarter 2017 Groundwater Monitoring Report, Alcoa-Davenport Works, dated
January 2018.
Tetra Tech, 2018. First Quarter 2018 Groundwater Monitoring Report, Alcoa-Davenport Works, dated
May 2018.
Tetra Tech, 2018. Third Quarter 2018 Groundwater Monitoring Report, Alcoa-Davenport Works, dated
November 2018.
Tetra Tech, 2019. First Quarter 2019 Groundwater Monitoring Report, Alcoa-Davenport Works, dated
May 2019.
Tetra Tech, 2019. Third Quarter 2019 Groundwater Monitoring Report, Alcoa-Davenport Works, dated
November 2019.
Tetra Tech, 2020. First Quarter 2020 Groundwater Monitoring Report, Alcoa-Davenport Works, dated
May 2020.
Tetra Tech, 2020. Third Quarter 2020 Groundwater Monitoring Report, Alcoa-Davenport Works, dated
November 2020.
Tetra Tech, 2021. First Quarter 2021 Groundwater Monitoring Report, Alcoa-Davenport Works, dated
May 2021.
Tetra Tech, 2021. Third Quarter 2021 Groundwater Monitoring Report, Alcoa-Davenport Works, dated
November 2021.
Tetra Tech, 2017. First Quarter 2017 Progress Report, Alcoa-Davenport Works, dated April 2017.
Tetra Tech, 2017. Second Quarter 2017 Progress Report, Alcoa-Davenport Works, dated July 2017.
Tetra Tech, 2017. Third Quarter 2017 Progress Report, Alcoa-Davenport Works, dated October 2017.
Tetra Tech, 2018. Fourth Quarter 2017 Progress Report, Alcoa-Davenport Works, dated January 2018.
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Tetra Tech, 2018. May 2018 Progress Report, Alcoa-Davenport Works, dated May 2018.
Tetra Tech, 2018. November 2018 Progress Report, Alcoa-Davenport Works, dated November 2018.
Tetra Tech, 2019. May 2019 Progress Report, Alcoa-Davenport Works, dated May 2019.
Tetra Tech, 2019. November 2019 Progress Report, Alcoa-Davenport Works, dated November 2019.
Tetra Tech, 2020. May 2020 Progress Report, Alcoa-Davenport Works, dated May 2020.
Tetra Tech, 2020. November 2020 Progress Report, Alcoa-Davenport Works, dated November 2020.
Tetra Tech, 2021. May 2021 Progress Report, Alcoa-Davenport Works, dated May 2021.
Tetra Tech, 2021. November 2021 Progress Report, Alcoa-Davenport Works, dated November 2020.
URS Greiner Woodward Clyde, 2000. Human Health Risk Assessment Report - Mississippi RiverPool
15. May.
URS Corporation, 2002. Ecological Risk Assessment Report- Mississippi River Pool 15. November.
URS Corporation, 2004. Feasibility Study-Mississippi River Pool 15. May.
URS Corporation, 2012. Mississippi River Pool 15 Monitored Natural Recovery Program - 2012
(Draft).
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APPENDIX B
SITE CHRONOLOGY
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Pre-ROD Activities
Date
Alcoa-Davenport Works began manufacturing aluminum sheets and plate products
1948
Alcoa discovered PCBs in 3.5 million gallons of waste oil in an unlined, surface
impoundment, and voluntarily initiated a remedial program
1979
Alcoa removed PCB-containing oils from hydraulic lines at the 86-inch
Continuous Heat Treatment (CHT) Line
1979
Alcoa removed all pumpable waste oil and sludge, and solidified any remaining
sludge with cement kiln dust to prevent leaching of PCBs
1980-1981, June
Alcoa conducted groundwater monitoring, discovering PCBs and VOCs in
groundwater near the surface impoundment
1980-1984
The EPA conducted initial site-wide Toxic Substances Control Act (TSCA)
inspection
1981, February 9-10
The EPA began fish and sediment monitoring in MRP 15
1983
The EPA issued an Administrative Order on Consent (AOC), Docket No. 84-F-
0004, requiring submission of an Initial Remedial Action Plan (IRAP)
1984, February 22
The EPA issued several Findings of Fact in Consent Agreement and Consent
Order, TSCA Docket No. VII-81-T-57
1984, February 27
Alcoa installed an oil interception and recovery trench, and capped the
impoundment with a low-permeability, compacted clay
1985, January
Alcoa removed PCB-contamination from walls of the industrial waste sewer
system using a high-pressure wash (with subsequent periodic cleanings)
1985
The EPA issued AOC, Docket No. 86-H-0009 to assess groundwater quality in the
vicinity of the former oil lagoon
1986, August 14
Alcoa discovered PCBs in groundwater in vicinity of 86-inch CHT Line
1987, June 24
Alcoa secured agreement with the EPA (Consent Agreement and Final Order, TSCA
Docket No. VE-87-T-027) to burn PCB-contaminated fuel oil in the #14
reverberatoiy melting furnace and cleanup three, one-million gallon tanks used to
store reclaimed oil
1988, October 26
Alcoa began biennial sampling and PCB-analysis of fish from specified sites in
MRP 15
1988
IDNR issued a Fish Consumption Advisory for carp caught on the Iowa side of
MRP15
1989,June
Alcoa notified the EPA that VOCs were also discovered in the groundwater near
the 86-inch CHT Line
1989, August 9
Alcoa notified IDNR about a suspected release of PCE to soils in an area associated
with two, 10,000-gallon above-ground storage tanks (ASTs). Alcoa
voluntarily excavated approximately 400 cubic yards of the PCE-contaminated soil
1989, December 12
Alcoa began continuous operation of an industrial process well (PW-06) to provide
hydraulic containment and prevent the offsite migration of contaminatedgroundwater
near the western boundary and most of the Alcoa shoreline
1989
Alcoa removed PCB-contaminated soils from transformer pits and vaults to satisfy
National Pollution Discharge Elimination System (NPDES) permit requirements, and
reduced PCB levels in all electric-transformers as part of the facility PCB
Management Plan
Late 1980s-Early 1990s
IDNR issued a second Fish Consumption Advisory for carpsuckers (white carp)
1990, April
The EPA issued an AOC, Docket No. VII-90-F-0027, requiring Alcoa to conduct a
site-wide Facility Site Assessment (FSA), including sediment and fish sampling at
MRP15. In addition, activities conducted pursuant to the 1984 and 1986 AOCs
were incorporated into the 1990 AOC
1990, July 19
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The EPA issues letter stating cleanup associated with TSCA Docket No. VH-87-T-
027 had been achieved and case was closed
1991, April 19
Alcoa submitted a FSA report which identified 81 units (later revised to 82) where
significant releases of hazardous substances may have occurred from current and
historical plant production or waste management activities. (Conditional approval
by the EPA 10 February 1993)
1992, April 15
Alcoa installed an on-site ultraviolet light (UV)/peroxide treatment system prior to
discharge at PW-06 and began monitoring the effluent
1993
The EPA issued an AOC, Docket No. VII-95-F-0026, requiring Alcoa to evaluate
risk at the various FSA units, and if necessary, perform mitigation removal actions.In
addition, the 1995 AOC specifically required Alcoa to conduct a Remedial
Investigation (RI) and Feasibility Study (FS) for groundwater.
1995, August 14
The EPA issued an amendment to the 1990 AOC, Docket No. VII-90-F-0027 to
update the risk assessment and modify fish sampling procedures
1996, September 4
Alcoa completed 22 Risk-Based Concentration (RBC) Reports for the 82 FSA
units pursuant to the 1995 AOC
1996-2004
Alcoa removed 800 cubic yards of PCB-contaminated soil down to bedrock during
decommissioning and demolition of the fuel oil pump house associated with the
three, one-million gallon tanks
1996
Alcoa redesigned the water reclamation system
1997
Alcoa completed an Evaluation of Biennial Fish Investigation to assess trends in
PCB concentrations for fish collected in MRP15 since 1988
2000, May
Alcoa completed a Human Health Risk Assessment Report for MRP 15
2000, May
IDNR lifted the fish consumption advisories for carp and carpsucker
2000, August
Alcoa signed a Declaration of Restrictive Covenant that prohibits the construction
and use of drinking water wells within the plant's boundary
2001, April
Alcoa completed an Ecological Risk Characterization Report for FSA Units
2001, September
Alcoa removed 140 cubic yards of debris and soil associated with the Former Light
Bulb Dump
2001
Alcoa completed the groundwater RI report, including the groundwater Baseline
Risk Assessment (BLRA) (revised and approved July 31, 2002).
2002, May
The EPA issued an Enforcement Action Memorandum (EAM) to conduct a Non-
Time Critical Removal Action (NTCRA) for portions of the Eastern Historical
Disposal Site (EHDS) and National Pollution Discharge Elimination System
(NPDES) Outfall 002
2002,June 7
Alcoa completed an Ecological Risk Assessment Report for MRP 15
2002, November
Alcoa replaced the on-site UV/peroxide treatment system with a tower air stripper
2002, November
Alcoa completed the NTCRA, which included removal of approximately 390 cubic
yards of sediment from the Outfall 002 channel, which were subsequently placedin
the EHDS and Wetland 2 Area and covered with at least two feet of clean fill
2003, April 23
IDNR issued a Consent Administrative Order requiring discharges fromOutfall 007
to comply with an interim effluent limit of 50 jig/L
2003, September 17
Alcoa completed the MRP15 FS
2004, May 21
Alcoa completed the Groundwater FS, with included a Technical Impracticability
(TI) Evaluation Report (subsequently revised September 2004)
2004, May 26
The EPA approved the Proposed Plan (PP)
2004, July
Alcoa conducted sub-slab gas sampling beneath basements of two unoccupied houses
(currently owned by Alcoa) which identified the presence of organic vapors
(primarily PCE)
2004, July 28-29
The EPA approved the Record of Decision
2004, September
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Post-ROD Activities
Alcoa began using PW-05 as the primary extraction well due to reduced pumping
capacity at PW-06
2006, November
The EPA issued an ESD for Alcoa property (no changes to remedy for MRP 15) to
update and clarify the performance standards for groundwater and effluentmonitoring
2007, July
PW-07 became the primary extraction well as a replacement for PW-05
2008, April
Consent Decree, Civil Action No. 3:08-cv-00096-RPCFB, between Alcoa and the
EPA signed/approved
2008, December 11
Alcoa submitted Environmental Covenant & Title (EPA still reviewing)
2009,January
Alcoa began submitting Progress Reports per the 2008 CD
2009, January
Davenport Water Pollution Control Plant (WPCP) issued conditional approval for
Alcoa to recycle treated groundwater for use within the plant
2009, August 4
Short Term Management Plan (STMP) approved
2011, October 17
Remedial Design (RD)/Remedial Action (RA) Work Plan approved, which
included the Groundwater Containment, Extraction, and Treatment System (GCETS)
Plan, the Long Term Monitoring Plan (LTMP), and the Monitored
Natural Recovery Program Plan (MNRPP)
2011, October 17
Remedial actions (per the ROD) were initiated
2012, July
Alcoa conducted the baseline Fish Sampling Event
2012, September 11-17
Alcoa replaced the tower air stripper with shallow tray air stripper
2012, October
Alcoa submitted the Preferential Flow and Well Installation Report, per comments
received from the EPA during approval of the RD/RA Workplan
2013, January
The EPA approved a revised GCETS RD/RA Workplan for shallow tray air
stripper
2013, May
LTMP/GCETS formally implemented
2014, September
Alcoa submitted work plan for modeling air stripper emissions
2016, April
Fish Sampling Event
2016, September
Name change from Alcoa to Arconic Inc.
2016, November
IDNR issued a Fish Consumption Advisory for carp over 20 inches in length for
the Mississippi River (Scott County), MRP15 at Davenport
2017
Activities Since First FYR Report dated July 28, 2017
MRP 15 Sediment Monitoring
2017, September
Alcoa Site Operational and Functional Report
2017, October
LTMP modified to optimize groundwater sampling
2018, March
Frequency of Progress Reports modified from quarterly to semiannual
2018, April
MNRPP modifications to discontinue fish tissue sampling
2018, August
Vapor Intrusion Assessment
2018, October - 2020, July
Formal delisting from Iowa Registry of Hazardous Waste or Hazardous Substance
Disposal Sites
2018, December
Environmental Covenant recorded on site property at the Scott County Recorder's
office
2019, April 29
Alcoa Site Remedial Action Report
2019, May
Site Management Plan updated
2019, May
MRP 15 Interim Remedial Action Report
2019, December
MRP 15 Sediment Monitoring
2020, October
Expanded groundwater monitoring for FYR
2020, October
Extraction well for GCETS PW-07 taken off-line and replaced by PW-05
2020, December
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APPENDIX C
PHYSICAL CHARACTERISTICS
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1.0 Physical Characteristics
The site description is a summary of information presented in earlier reports for the Alcoa-
Davenport Works (Shaw E&I, Inc. [Shaw], 2002; and ENSR, 2004). Figure C.l shows surface
water features and the locations of all monitoring locations that have been installed during
previous site investigations, as well as the bedrock monitoring wells installed in 2012 (Tetra
Tech [Tt], 2013).
1.1 Topography
Figure C.2 is a reproduction from a United States Geological Survey (USGS) quadrangle map.
Other maps in this report are based on the Alcoa-Davenport Works coordinate system. The plant
coordinate system is based on plant north which is offset from true north as indicated. An
abbreviated discussion of site topography is presented below. A more detailed discussion of
topography can be found in the Facility Site Assessment (FSA) Report (Geraghty & Miller
[G&M], 1993).
The Alcoa-Davenport Works is located on a broad, gently sloping flood plain terrace of the
Mississippi River (Figure C.2), and all surface drainage is ultimately towards the river.
Topographic relief from the river's edge to the base of the bluffs that bound the flood plain
terrace in the vicinity of the Alcoa-Davenport Works is less than 30 feet. Elevations within the
flood plain range from 560 to 590 feet above mean sea level (AMSL). Because the topography of
the site is relatively flat and the site is located adjacent to the Mississippi River Pool 15
(MRP15), a flood control dike was constructed around the main plant buildings to protect the
plant during times of flooding along the Mississippi River. The flood control dike was
constructed with a clay core keyed into bedrock to prevent the dike from rupturing during flood
events. The top of the main flood control dike was constructed to an elevation of approximately
580 feet AMSL. The location of the flood control dike is shown on Figure C.l.
The bluffs to the northwest of the Alcoa Site are relatively flat topped. Topographic relief from
the base to the top of the bluffs is approximately 70 feet. Relief within the bluff-bounded
highlands is due to erosional features associated with the development of the current drainage
system. East of the plant, drainage to the Mississippi River is provided by Crow Creek and its
associated unnamed tributaries. Duck Creek and its associated unnamed tributaries provide
drainage for the area west of the plant. Drainage at the plant site is provided by six man-made
National Pollutant Discharge Elimination System (NPDES) outfalls that are drainage ditches
regulated by Iowa Department of Natural Resources (IDNR) NPDES permits. Numerous
historical aerial photographs of the Alcoa Site indicate that a significant amount of fill material
has been added to low areas especially near the river shoreline since 1953.
1.2 Surface Water
Surface water and drainage in the vicinity of the plant can be divided into naturally occurring and
engineered surface-water and drainage features. Naturally-occurring drainage features and
surface-water bodies include the Mississippi River and its major tributaries. Storm water
drainage of the immediate plant site is provided by the NPDES outfalls (Figure C.l).
-------
The most significant drainage feature and surface-water body near the plant is the Mississippi
River. The Alcoa-Davenport Works is located between river miles 488 and 490 and is adjacent to
MRP 15. As determined during the Remedial Investigation (RI), the width of the Mississippi
River varies from 2,600 to 4,000 feet in the vicinity of the plant, and the maximum depth of the
river in the vicinity of the plant is approximately 21.6 feet. The river bottom is underlain by
limestone bedrock with a veneer of sediment, which slopes from the shoreline to a depth of
approximately 7 tolO feet at a distance of 150 feet from shore. Sediments are absent in some
portions of the river bottom including the portions adjacent to the Ash Pond and Former Waste
Disposal Site.
The river level is controlled by a system of locks and dams operated by the U.S. Army Corps of
Engineers. MRP15 extends from Lock & Dam 15 at river mile 482.9 in an east to northeast
direction for 10.4 river miles upstream to Lock & Dam 14 which is about 4 miles downstream of
LeClaire, IA. Normal pool elevation, according to the 1970 Silvis, Iowa-Illinois USGS
topographic quadrangle and the 1982 bathymetric map, is 561 feet AMSL. The river channel,
used by large river boats, is located approximately 1,000 feet offshore of the Alcoa-Davenport
Works and ranges from 10.1 to 21.6 feet in depth.
1.3 Geology and Hydrogeology
The geology and hydrology at the Alcoa Site are described in the RI Report (Shaw, 2002), and
are summarized here. Because the RI Report was published in 2002, updated information has
been added to this summary as applicable.
1.3.1 Geology
In general, the geology beneath the Davenport Works consists of a layer of unconsolidated
sediments (i.e., silt and clay, with minor amounts of fine sand) atop several bedrock formations
(i.e., limestone and shale). Geologic cross sections from various plant locations are provided in
the RI Report. Across the site, the thickness of the unconsolidated zone ranges from 0 feet in the
northern end of the site to an estimated 27 feet in some locations along the river shoreline. Fill
material comprises a significant portion of the unconsolidated materials at the facility, especially
in areas along the southern side of the site. The unnatural fill sediments consist of compacted
gravel, coarse sand, silt, and clay, with concrete and other construction demolition debris.
The unconsolidated sediments are underlain by several bedrock units. As described by G&M
(1995), the youngest bedrock units are the undifferentiated Pennsylvanian shales, which are
composed of thin-bedded, dark gray-green carbonaceous shale. These discontinuous shale
deposits generally have a thickness of 15 feet or less. Where present, the Pennsylvanian-age
shales unconformably overlie the Devonian Wapsipinicon Limestone, which is thin-bedded, fine-
grained, and contains frequent shale beds. This shallow formation has been encountered at
depths ranging from 5 to 45 feet below ground surface (bgs) and is underlain by Silurian
Carbonate which occurs at depths ranging from 35 to approximately 400 feet bgs. The lithology
of the Silurian Carbonate consists of limestone and dolomite to respective depths of
approximately 150 and 400 feet bgs. A large stratigraphic unconformity exists between the
Devonian and Silurian units. Beneath the Silurian Carbonate is the Ordovician-age Brainard
-------
Shale which consists of silty dolomitic greenish-gray shale interbedded with varying amounts of
argillaceous dolomite. The Brainard shale is believed to be 75 to 100 feet thick beneath the
Alcoa-Davenport Works, but no borings at the Alcoa Site penetrated its full thickness.
The bedrock surface contour map presented in the RI Report shows an undulating bedrock
surface underlying the Alcoa Site that contains numerous closed depressions, but has an overall
gentle slope towards the river.
1.3.2 Hydrogeology
Two principal water-bearing units are present beneath the Alcoa Site: a surficial water-bearing
zone present in some of the unconsolidated deposits, and the underlying bedrock aquifer.
Groundwater flow within the unconsolidated water-bearing zone is complex with local and
temporal variability. Unconsolidated materials are present beneath most of the facility; however,
a large portion of this zone is unsaturated. Areas where the unconsolidated zone is usually
unsaturated include the northern and eastern portions of the plant. West of the flood control dike
near the northwest facility boundary, the unconsolidated zone is typically unsaturated; however,
some saturation can occur in depressions in the bedrock surface and in discontinuous seasonal
perched water bearing zones. The unconsolidated zone is saturated within the area surrounded by
the flood control dike in the western portion of the facility and along the river shoreline.
Horizontal migration of unconsolidated zone groundwater, where present, is limited due to flow
barriers (outfall ditches, foundations, flood-control dikes, seasonally unsaturated areas); variable
recharge (spatially and temporally); vertical leakage into the bedrock aquifer; and variations in
lithology.
As described above, the unconsolidated zone is underlain by the bedrock that consists of shale,
limestone, and dolomite. The bedrock aquifer is present in zones that have been termed as
shallow, intermediate, and deep. The shallow bedrock aquifer exists in a zone of inter-bedded
limestone and shale to a depth of approximately 50 feet bgs. Below this unit, the lithology
consists of limestone and dolomite (intermediate and deep bedrock). There is a discontinuous
semi-impermeable layer between the shallow bedrock zone and the intermediate/deep bedrock
zones. The intermediate bedrock zone occurs from approximately 50 to 150 feet below grade,
and the deep bedrock zone occurs from 150 to 400 feet below grade. As discussed in the RI
Report (Shaw, 2002), the intermediate and deep bedrock appear to act as one hydraulic unit.
The Devonian limestone formation (shallow bedrock) beneath the Alcoa Site is recharged by: 1)
infiltration from the unconsolidated water-bearing zone, 2) upgradient (off-site) portions of the
shallow bedrock aquifer under pumping or non-pumping conditions, 3) the Mississippi River
under pumping conditions when aquifer heads are below the river elevation, and 4) storm water
that enters outfalls such as Outfall 006 and the northern portion of Outfall 001 which are cut
through bedrock. In general, the Silurian bedrock aquifer (intermediate/deep bedrock) is
recharged by: 1) upgradient (off-site) portions of the intermediate/deep bedrock aquifer under
pumping or non-pumping conditions, and 2) infiltration from shallow bedrock.
Historically, G&M (1996) indicates the flow direction in each monitored zone under non-
pumping (natural) conditions was towards the river. However, both Alcoa and the MidAmerican
-------
power plant to the east have pumping wells that can affect groundwater flow. Since 1989, Alcoa
has operated a pumping well in order to prevent, to the extent practicable, the off-site flow of
contaminated groundwater. The water removed by the pumping well is contaminated with
volatile organic compounds (VOCs) and is therefore treated with an air stripper.
From 1989 to 2006, the primary well used to contain groundwater underlying the site was PW-
06. Due to decreased production, this well was replaced in 2007 by PW-07. PW-05 served as a
backup to PW-06 and is now a backup to PW-07. The operating pumping well draws
groundwater from the intermediate/deep bedrock zone.
The MidAmerican Riverside power plant began operating a pumping well the third quarter 2001
to provide non-contact industrial water. The MidAmerican well (when operating) generates a
minor shift in the bedrock groundwater flow divide in the eastern portion of the Alcoa Site. The
presence of the MidAmerican well and its influence on groundwater flow is discussed in the
Record of Decision (ROD) and was accounted for in the development of the remedy.
-------
EXFlAVADSN
6001-=
/ rx st
0O1-PO1U
I
QOMOJ
11
mallow bedrock woiiTonao
¦ *
•rtEWIKM
DEEP BEDIOCKMOHTOiain WEU
ironsTKAi wiu
""" EXPL0RATQ1V601L BOklHQ
¦•-01 CHICCnoll HAHHOLE
ALCOA - DAVENPORT WORKS
BETTCNDORF. IOWA
SiTEWIDE
MONITORING POINT
LOCATIONS
I
TETRA TECH
-------
ir Savtoi
Radio |
Towers!
Scolt-GommanHv
College
lrailet
Park/
F Radio
Towers
Riverdale
Riverdale
Park
Pdwarplam
/ Mile
' ' 490
BELLS ISLAND
STATE PARK
- ^rr9°c
Trailer
Park/
Source: U.S.G.S Topographic Map
Silvis, Il!-lowa Quadrangle, 41090-E4-TF-024,1991
Scale: 1"=2000'
J53^
Figure C.2
It
TETRATECH
Site Map
Alcoa-Davenport Works
Riverdale, Iowa
J
G:\.. .Davenport\pcook\Remedial Design\LTMP-GW\Figures\Figl-l-pcl.ppt
-------
APPENDIX D
SITE INSPECTION
-------
R7 FYR Inspection Form
Please fill out relevant information. If a section doesn't apply, you may select "N/A" and click the arrow
next to the section header to minimize the information.
Site Information
Site Name
Date of Inspection
Location
Region
EPA ID
Agency, Office, or
Company Leading Five-
Yea r Review
Weather/Temperature
Remedy includes:
Attachments
Alumimum Company of America - Davenport and Mississippi River Pool 15
7/9/2021
Property Address: 4879 State Street
City: Riverdale
County: Scott County
State: Iowa
Region 7
IAD005270160 (ALCOA) & IAD981117161 (MRP15)
EPA Region 7
Sunny/82-89 degrees Fahrenheit
~ Landfill cover/containment
~Access controls
IE Institutional controls
^Groundwater pump and
treatment
lEOther: Monitored Natural
Recovery
IE Inspection team roster attached
lESite map attached
IE Photo log attached
~ Monitored national attenuation
^Groundwater containment
~Vertical barrier walls
~Surface water collection and
treatment
Interviews (~ Applicable [3N/A)
Fill out all that apply.
O&M Site Manager
Name: Pat Cook Problems and Suggestions:
Title:
Date:
Interviewed:
~At site
~At office
~ By phone Phone Number:
~ Report attached
O&M Staff
Name:
Problems and Suggestions:
-------
Title:
Ddte ¦ i j|i# i ¦>
interviewed:
~At site
~At office
~ By phone Phone Number:
~ Report attached
Local Regulatory Authorities and Response Agencies
For example, state and tribal offices, emergency response office, police department, office of public
health or environmental health, zoning office, recorder of deeds, or other city and county officials.
Agency: . Problems and Suggestions:
Name:
Title:
Date:
Phone Number:
~ Report attached
Agency: Problems and Suggestions:
Name:
Title:
Date:
Phone Number:
~ Report attached
Agency: Problems and Suggestions:
Name:
Title:
Date:
Phone Number:
~ Report attached
Agency: Problems and Suggestions:
Name:
Title:
Date:
Phone Number:
~ Report attached
Other Interviews (optional)
~ Report attached
-------
On-Site Documents and Records Verified {MApplicable HUN/A)
O&M Documents
EO&M manual ISIReadily available EUptodate DN/A
IE As-built drawings IE Readily available lEUptodate DN/A
IE Maintenance logs IE Readily available lEUptodate DN/A
Remarks:
Site-Specific Health and Safety Plan
IE Site-Specific Health and Safety Plan IE Readily available lEUptodate DN/A
lEContingency Plan/Emergency IE Readily available lEUptodate DN/A
Response Plan
Remarks:
O&M and OSHA Training Records
IEO&M and OSHA training records IE Readily available lEUptodate DN/A
Remarks:
Permits and Service Agreements
~Air discharge permit
IE Effluent discharge
~ Waste disposal, POTW
~ Other permits
~ Readily available
IE Readily available
~ Readily available
~ Readily available
~ Up to date
IE Up to date
~ Up to date
~ Up to date
EN/A
~ N/A
EN/A
EN/A
Remarks:
Gas Generation Records
~ Gas generation records
Remarks:
~ Readily available
~ Up to date
EN/A
-------
Settlement Monument Records
~ Settlement monument records
Remarks:
~ Readily available
~ Up to date
KIN/A
Groundwater Monitoring Records
^Groundwater monitoring records IEReadily available lEUptodate DN/A
Remarks:
Leachate Extraction Records
~ Leachate extraction records ~ Readily available ~ Up to date IE N/A
Remarks:
Discharge Compliance Records
~Air ~ Readily available ~Uptodate IE N/A
IE Water (effluent) IE Readily available lEUptodate DN/A
Remarks:
Daily Access/Security Logs
IE Daily access/security logs IE Readily available IE Up to date ~ N/A
Remarks:
O&M Costs (~ Applicable KIN/A)
O&M Organization
~ State in-house
~ PRP in-house
~ Federal facility in-house
~ Contractor for state
~ Contractor for PRP
~ Contractor for federal facility
-------
~ Other: Click or tap here to enter text.
O&M Cost Records
~ Readily available ~ Up to date ~ Funding
mechanism/agreement in place
Original O&M cost estimate: ^Breakdown attached
Total annual cost by year for review period, if available:
From Click or tap here to enter text, to Click or tap here to enter text.
Total cost: Click or tap here to enter text.
~Breakdown attached
From Click or tap here to enter text, to Click or tap here to enter text.
Total cost: Click or tap here to enter text.
~Breakdown attached
From Click or tap here to enter text, to Click or tap here to enter text.
Total cost: Click or tap here to enter text.
~ Breakdown attached
From Click or tap here to enter text, to Click or tap here to enter text.
Total cost: Click or tap here to enter text.
~ Breakdown attached
From Click or tap here to enter text, to Click or tap here to enter text.
Total cost: ""
~ Breakdown attached
Unanticipated or Unusually High O&M Costs During Review Period
Describe costs and reasons:
Access and Institutional Controls (^Applicable EDM/A)
A. Fencing
Fencing damaged ~ Location shown on DGates secured DN/A
site map
Remarks:
-------
B. Other Access Restrictions
Signs and other security ~ Location shown on site map
Remarks: ir tap here to er
KIN/A
measures
C. Institutional Controls (ICs)
Implementation and , Site conditions imply ICs not properly
enforcement
~Yes DNo DIM/A
implemented
Site conditions imply ICs not being fully enforced ~ Yes M No ~ N/A
Type of monitoring (e.g., self-reporting, drive-by):
Adequacy
Frg£jU6nCyi rtr h ntar tavt
Responsible party/agency:
Contact:
Title: Click or tap here to enter text.
Date: L-- —
Phone number:
Reporting is up to date
Reports are verified by the lead agency
Specific requirements in deed or decision
documents have been met
Violations have been reported
Other problems or suggestions: Click or tap here
~ Report attached
IE ICs are adequate
Remarks:
ISlYes DNo DIM/A
lElYes DNo DN/A
lElYes DNo DN/A
~Yes DNo KN/A
~ ICs are inadequate ~ N/A
D. General
Vandalism/trespassing
~ Location shown on site map
ISlNo vandalism
Remarks:
Land use changes on
site
~ N/A
Remarks: No land use changes.
~ N/A
-------
Land use changes off Remarks: No indication of land use changes off site property,
site
A. Roads
Roads damaged
Remarks:
~Applicable DN/A
~ Location shown on site map
~ Roads adequate
~ N/A
B. Other Site Conditions
Remarks:
1. Settlement (low
spots)
~ Location shown on site map
Area I extent: „
~ Settlement not evident
Depth:
Remarks:
2. Cracks ~ Location shown on site map DCracking not evident
Areal Extent: Widths: , Depth:
Remarks:
3. Erosion ~ Location shown on site map ~ Erosion not evident
Areal Extent: Depth:
Remarks:
-------
4. Holes ~ Location shown on site map ~ Holes not evident
Areal Extent: Depth:
Remarks:
5. Vegetative Cover ~ Grass
~ No signs of stress
| DCover properly established
~Trees/shrubs (indicate size and locations on a diagram)
Remarks:
6. Alternative Cover ~ Applicable DN/A
(armored rock, Remarks:
concrete, etc.)
7. Bulges ~ Location shown on site map ~ Bulges not evident
Areal extent: Height:
Remarks:
8. Wet Areas and Water ~ Wet areas/water damage not evident
Damage
~ Wet areas
~ Ponding
~ Seeps
~ Soft subgrade
Remarks:
~ Location shown on
map site
~ Location shown on
map site
~ Location shown on
map site
~ Location shown on
map site
Areal extent:
Areal extent:
Areal extent:
Areal extent:
9. Slope Instability DSIides ~ Location shown on ~ No evidence of slope
site map instability
Areal extent:
Remarks:
-------
Benches (DApplicabie IXJN/A)
Horizontally constructed mounds of earth placed across a steep landfill side slope to interrupt the slope
in order to slow down the velocity of surface runoff and intercept and convey the runoff to a lined
channel.
1. Flows Bypass Bench ~ Location shown on site map
Remarks:
~ N/A or okay
2. Bench Breached
~ Location shown on site map
Remarks:
~ N/A or okay
3. Bench Overtopped ~ Location shown on site map
Remarks:
~ N/A or okay
Letdown Channels (DApplicabie IE!N/A)
Channel lined with erosion control mats, riprap, grout bags, or gabions that descend the steep side slope
of the cover and will allow the runoff water collected by the benches to move off of the landfill cover
without creating erosion gullies.
1. Settlement
~ Location shown on site map
Areal extent:
2r text.
~ No evidence of settlement
Depth:
it.
Remarks:
2. Material Degradation
~ Location shown on site map
Areal extent:
*r text.
~ No evidence of degradation
Material type:
ter text.
Remarks:
3. Erosion
~ Location shown on site map
Areal extent:
~ No evidence of erosion
Depth:
-------
Remarks:
4. Undercutting
~ Location shown on site map
Areal extent:
~ No evidence of undercutting
Depth:
Remarks:
5. Obstructions
~ Location shown on site map ~ No evidence of undercutting
Type: Areal extent: Size:
Remarks:
6. Excessive Vegetative
Growth
~ Location shown on
site map
Type:
~ No evidence of
excessive growth
~Vegetation in channels
does not obstruct flow
Areal extent:
Remarks:
1. Gas Vents
~Active
~ Properly secured/locked
~ Routinely sampled
~ Evidence of leakage at penetration
Remarks:
~ Passive
~ Functioning
~ Good condition
~ Needs maintenance ~ N/A
2. Gas Monitoring
Probes
~ Properly secured/locked
~ Routinely sampled
~ Evidence of leakage at penetration
~ Functioning
~ Good condition
~ Needs maintenance
~ N/A
Remarks:
-------
3. Monitoring Wells
(within surface area of
landfill)
~ Properly secured/locked
~ Routinely sampled
~ Evidence of leakage at penetration
~ Functioning
~ Good condition
~ Needs maintenance
~ N/A
Remarks:
4. Leachate Extraction
Wells
5. Settlement
Monuments
~ Properly secured/locked
~ Routinely sampled
~ Functioning
~ Good condition
~ Evidence of leakage at penetration ~ Needs maintenance ~ N/A
Remarks: Click or tap hei , ter text.
~ Located
Remarks:
~ Routinely surveyed ~ N/A
Gas Collection ar
1. Gas Treatment
Facilities
tment (DApplicable E]N/A)
~ Flaring ~ Thermal destruction
~ Good condition ~ Needs maintenance
Remarks:
~ Collection for reuse
2. Gas Collection Wells,
Manifolds and Piping
~ Good condition ~ Needs maintenance
Remarks:
3. Gas Monitoring
Facilities (e.g., gas
monitoring of adjacent
homes or buildings)
~ Good condition ~ Needs maintenance
Remarks:
~ N/A
Cover Drainage Layer (QApplicable IXlN/A)
1. Outlet Pipes ~ Functioning ~ N/A
Inspected
Remarks:
-------
2. Outlet Rock Inspected ~ Functioning ~ N/A
Remarks: Click or tap here to enter text.
Detention/Sedimentati
3n Ponds (DAppIicable 13N/A)
1. Siltation
~ Siltation not relevant
~ N/A
:
Areal extent:
Depth:
Remarks:
t.
2. Erosion
~ Erosion not relevant
~ N/A
Areal Extent: Click or tap here to
i Depth: Click or tap here to enter ;
Remarks: „r
-t. I
3. Outlet Works
~ Functioning ~ N/A
i
Remarks: Click or tap here to enter text.
4. Dam
~ Functioning ~ N/A
Remarks: Click or tap here to enter text. ;
:
Retaining Walls (DAppi
1. Deformations
icable IXJN/A)
~ Location shown on site map ~ Deformation not evident
Horizontal Vertical displacement: Rotational displacement:
displacement:
Remarks:
2. Degredation
~ Location shown on site map ~ Degradation not evident
-------
Remarks: Click or tap here to enter text.
Perimeter Ditches/Off-Site Discharge {QApplicable IXJN/A)
1. Siltation ~ Location shown on map ~ Siltation not relevant
Areal extent: , Depth:
i I enter text. I text.
Remarks:
2. Excessive Vegetative
Growth
~ Location shown on
site map
Type:
~ N/A ~ Vegetation does not
impede flow
Areal extent:
Remarks:
3. Erosion
~ Location shown on map
Areal Extent:
~ Erosion not relevant
Depth:
Remarks:
4. Discharge Structure ~ Functioning ~ N/A
Remarks:
Vertical Barrier Walls
1. Settlement
(~Applicable E3N/A)
~ Location shown on map ~ Settlement not relevant
Areal extent: Depth:
-------
i Remarks: Click or tap here to enter text.
2. Performance Monitoring ~ Performance not monitored ~ Evidence of breaching
Type of monitoring: Frequency: Head differential:
Remarks:
Groundwater/Surface Water Remedies {MApplicable DN/A)
Groundwater Extraction Wells, Pumps, and Pipelines (DApplicable DN/A)
Pumps, Wellhead Plumbing, and Electrical
lEGood condition IE All required wells ~ Needs maintenance DN/A
properly operating
Remarks PW-07 taken off-line in December 2020 and is currently being evaluated.
PW-05 is operating, as designed.
Extraction System Pipelines, Valves, Valve Boxes, and Other Appurtenances
IE Good condition ~ Needs maintenance
Remarks
Spare Parts and Equipment
IE Readily available DGood condition ~ Requires upgrade DNeedstobe
provided
Remarks Backup airstripper system and discharge pipes are maintained for
contingency use.
-------
Surface Water Collection Structures, Pumps, and Pipelines (DApplicable IXlN/A)
Collection Structures, Pumps, and Electrical
~ Good condition ~ Needs maintenance
Remarks
Surface Water Collection System Pipelines, Valves, Valve Boxes, and Other Appurtenances
~ Good condition ~ Needs maintenance
Remarks
Spare Parts and Equipment
| ~ Readily available DGood condition
~ Requires upgrade
~ Needs to be
provided
Remarks
Click or tap here to enter text
Treatment System (IE!Applicable DM/A}
1. Treatment Train E3 Metals removed ~ Oil/water separation
~ Bioremediation ~ Air stripping
~ Carbon adsorbers
; Filters: Click or tap ht iter text.
IE Additive (e.g., chelation agent, flocculent): Click or tap here to enter te:
I i ~ Others: Click or t enter text.
~ Good condition ~ Needs maintenance
~ Sampling ports properly marked and functional
~ Sampling/maintenance log displayed and up to date
~ Equipment properly identified
-------
~ Quantity of groundwater treated annually:
~ Quantity of surface water treated annually:
Remarks:
2. Electrical Enclosures UlN/A lEGood Condition ~ Needs Maintenance
and Panels (properly Remarks-' *
rated and functional)
3. Tanks, Vaults, Storage DN/A lEGood Condition
^esse's ~ Proper secondary containment ~ Needs Maintenance
Remarks:
4. Discharge Structure DN/A lEGood Condition ~ Needs Maintenance
and Appurtenances Remarks:
5. Treatment Building(s) DN/A lEGood Condition (esp. roof and
doorways)
IE Chemicals and equipment ~ Needs Repair
properly stored
i Remarks: Click or tap here to enter text.
6. Monitoring Wells IE Properly secured/locked ~ Functioning
(pump and treatment ~ Routinely sampled ~ Good condition
remedy) ^ ^ reqUjrec| wells located ~ Needs Maintenance ~ N/A
; ; Remarks: c." icjg.
Monitoring Data (^Applicable IDN/A)
1. Monitoring Data IE Is routinely submitted on time IE Is of acceptable quality
2. Monitoring data IE Groundwater plume is IE Contaminant concentrations are
suggests: effectively contained declining
K/jr\ni+T\r£3ri Moihirof Atloni iaf*ir\n ( PI A r\r\l ir-o Klcs fvl M / A \
1. Monitoring Wells ~ Properly secured/locked ~ Functioning
(natural attenuation ~ Routinely sampled ~ Good condition
remedy) q reqUjrec| wells located ~ Needs Maintenance ~ N/A
-------
Remarks: Click or tap hei ter text.
Other Remedies (^Applicable DM/A)
If there are remedies applied at the site which are not covered above, attach an inspection sheet
describing the physical nature and condition of any facility associated with the remedy. An example
would be soil vapor extraction.
Overall Observations
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 emissions, etc.).
Overall, the site inspection found that the remedy components were functioning properly and well
maintained. PW-05 was performing at levels equivalent to historical levels at PW-07 (prior to
December 2020).
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.
No other maintenance issues were identified.
-------
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.
Opportunities for Optimization
Describe possible opportunities for optimization in monitoring tasks or the operation of the remedy.
Optimization of remedies at both the Alcoa Site and MRP15 Site were completed in 2018.
-------
APPENDIX E
INTERVIEW RECORD
-------
INTERVIEW RECORD
Site Name: ALCOA - Davenport Works & Mississippi River Pool #15
EPA ID No.: IAD005270160
Subject: Second Five-year Review
Time:
Date: February 1, 2022
Type:
Location of Visit:
Telephone
Visit
x Other
~ Incoming
Outgoing
Contact Made By
Name: Hoai Tran
Title: RPM
Organization: EPA
Individual Contacted
Name: Patrick Cook
Title: Supervising Contractor
Organization: TTS
Telephone No.: 412-553-2118
E-mail Address: patrick.cook@arconic.com
Street Address: Arconic Corporate Center, 201 Isabella St.
City, State, Zip Code: Pittsburgh, PA 15212
Summary of Conversation
1. What is your overall impression of the project (general sentiment)?
The project has progressed well through the Superfund process and the remedies for both the Alcoa and
MRP15 Sites are performing as expected with achievement of the respective Performance Standards.
2. What effects have the site operations had on the surrounding community?
The operation of the groundwater extraction and treatment system works to keep the plume from
impacting the plant's neighbors as well as the Mississippi River, and much of the treated groundwater is re-
used by the manufacturing plant which reduces the consumption of municipal water.
The remedy at the MRP15 site, monitored natural recovery, is functioning as designed. PCB concentrations
in fish have been reduced to levels that are protective of human health and the environment, and sediment
deposition along the shoreline provides a stable and protective environment.
3. Are you aware of any community concerns regarding the site or its operation and administration? If so,
please give details.
I am not aware of any such community concerns.
4. Are you aware of any events, incidents, or activities at the site such as vandalism, trespassing, or
emergency response from local authorities? If so, please give details.
I am not aware of any such events, incidents, or activities.
5. Do you feel well-informed about the site's activities and progress?
Yes, I am well-informed about the site's activities and progress.
6. Do you have any comments, suggestions, or recommendations regarding the site's management or
operation?
The remedies are performing well so I have no suggestions or recommendations.
7. Any other general comments?
No other general comments beyond that provided in the answer to Question 1 above.
-------
INTERVIEW RECORD
Site Name: ALCOA - Davenport Works & Mississippi River Pool #15
EPA ID No.: IAD005270160
Subject: Second Five-Year Review
Time:
Date: November 19,2021
Type: Telephone
Location of Visit:
Visit
x Other
~ Incoming
Outgoing
Contact Made By
Name: Hoai Tran
Title: RPM
Organization: EPA
Individual Contacted
Name: MattCulp
Title: Senior Environmental
Specialist
Organization: Iowa Department of Natural
Resources (IDNR)
Telephone No.: 515-725-8337
E-mail Address: matt.culp@dnr.iowa.gov
Street Address:
City, State, Zip Code:
Summary of Conversation
1. What is your overall impression of the project (general sentiment)?
Well organized, comprehensive assessment, on time reporting, professionally managed.
2. What effects have the site operations had on the surrounding community?
I'm not as informed on this question as others, but I would say that the site operations (if you mean
Alcoa's effects on the community) have been a mix of positive (employment) but has also caused
environmental impacts and risks to public health that have been well studied and addressed through
remedial actions and institutional controls.
3. Are you aware of any community concerns regarding the site or its operation and administration? If so,
please give details.
I am not aware of community concerns at this time.
4. Are you aware of any events, incidents, or activities at the site such as vandalism, trespassing, or
I'm not aware of any cases of vandalism, trespassing, or emergency response to the site.
5. Do you feel well-informed about the site's activities and progress?
The EPA and Consultant have been very good at providing the IDNR with timely submittals of information
(reports) and the status updates of the site activities and progress.
6. Do you have any comments, suggestions, or recommendations regarding the site's management or
operation?
I have no additional comments, suggestions, or recommendations or general comments.
7. Any other general comments?
No additional general comments.
-------
INTERVIEW RECORD
Site Name: ALCOA - Davenport Works & Mississippi River Pool #15
EPA ID No.: IAD005270160
Subject: Second Five-year Review
Time:
Date: February 1,2022
Type: Telephone Visit
Location of Visit: ALCOA facilities; Riverdale, Iowa
x Other
~ Incoming
Outgoing
Contact Made By
Name: Hoai Tran
Title: RPM
Organization: EPA
Individual Contacted
Name: John Riches
Title: Communications & Public
Affairs Manager
Organization: Davenport Works
Telephone No.: 563-459-2248
E-mail Address: john.riches@alcoa.com
Street Address:
City, State, Zip Code:
Summary of Conversation
1. What is your overall impression of the project (general sentiment)?
I still have an overall favorable opinion of the project.
2. What effects have the site operations had on the surrounding community?
None noted.
3. Are you aware of any community concerns regarding the site or its operation and administration? If
so, please give details.
I have not been contacted with any concerns in the past few years. We have not provided a community
environmental briefing for the last two years due to covid concerns.
We hope to restart those briefings later this year.
4. Are you aware of any events, incidents, or activities at the site such as vandalism, trespassing, or
This is a large facility. From time to time we have had fire calls and some vandalism in the parking lot.
When needed we call in outside authorities to investigate.
5. Do you feel well-informed about the site's activities and progress?
Yes.
6. Do you have any comments, suggestions, or recommendations regarding the site's management or
operation?
No.
7. Any other general comments?
Arconic is well respected in the Quad Cities. In addition to being one of the largest employers in the
community, the company and its charitable foundation provide grants and sponsorships in the
community.
-------
APPENDIX F
TABLES
-------
Table 2-1
Groundwater Performance Standards
EPA MCL 1
EPA HAL
Iowa Statewide
Parameter Group
Compound
(ug/L)
(Lifetime)2
(ug/L)
Groundwater
Standards 3
(ug/L)
1,1,1 -Trichloroethane
200
--
1,1,2,2-Tetrachloroethane
NA
0.3
—
1,1,2-Trichloroethane
5
--
—
1-1 Dichloroethane
NA
NA
140
1-1 Dichloroethene
7
--
—
1,2- Dichlorobenzene (o-DCB)
600
--
—
1,2- Dichloroethane
5
--
—
Cis-1,2- Dichloroethene
70
—
—
2- Butanone (Methyl ethyl ketone)
NA
4000
--
Methyl isobutyl ketone
(4-methyl-2-pentanone) (hexone)
NA
NA
560
Acetone
NA
NA
6300
Acrolein
NA
NA
3.5
Benzene
5
--
—
VOCs
Bromoform
80*
—
—
Carbon disulfide
NA
NA
700
Carbon Tetrachloride
5
--
—
Chlorobenzene
100
--
—
Chloroethane
NA
NA
60
Chloroform
80*
--
—
Chloromethane
NA
30
—
Dibromochloromethane
80*
--
—
Ethylbenzene
700
--
«
Methylene chloride (dichloromethane)
5
--
«
Tetrachloroethene
5
~
--
Toluene
1000
--
--
Trans-1,2-Dichloroethene
100
~
--
Trans-1,3-Dichloropropene
NA
NA
1.8
Trichloroethene
5
~
--
Vinyl chloride
2
--
--
Xylenes(total)
10,000
--
--
Aroclor 1242
0.5
--
--
PCBs
Aroclor 1248
0.5
--
--
Aroclor 1254
0.5
" 1
1 MCL=Maximum Contaminant Levels. Source: EPA Office of Water, "Drinking Water Standards and Health
Advisories", EPA Document 822-R-04-005, Summer 2006 Edition.
2 HAL= Health Advisory Level (Lifetime). Source: EPA Office of Water, "Drinking Water Standards and Health
Advisories", EPA Document 822-R-04-005, Summer 2006 Edition.
3 Iowa Statewide Groundwater Standards = statewide standards for groundwater in a protected groundwater source.
Source: Subrule 567 Iowa Administrative Code (IAC) 137.5(4)(a).
* MCL for total trihalomethanes.
NA= None Available.
Page 1 of2
-------
Table 2-1
Groundwater Performance Standards
— = HAL not used for groundwater performance standard if MCL available. Iowa Statewide Groundwater Standard
not used for performance standard if MCL or HAL available.
All units are micrograms per liter (ug/L).
Bold values = chemical-specific ARAR concentration values to be used as performance standards for compounds in
groundwater monitoring program. Detection limits and/or reporting limits may alter the performance standards for
certain compounds due to limitations associated with currently available analytical laboratory procedures.
Page 2 of 2
-------
Table 2-2
Groundwater Monitoring Levels
Parameter Group
Compound
EPA MCL 1
EPA HAL
(Lifetime) 2
Iowa Statewide
Groundwater
Standards 3
(ug/L)
aluminum
NA
NA
7,000
arsenic
10
—
—
barium
2000
—
—
beryllium
4
—
—
cadmium
5
—
—
chromium
100
—
—
cobalt
NA
NA
140
copper
1300
—
—
cyanide
200
—
—
INORGANIC
iron
NA
NA
4,900
COMPOUNDS
lead
15
—
—
manganese
NA
300
—
mercury
2
—
—
nickel
NA
100
—
selenium
50
—
—
silver
NA
100
—
thallium
0.5
—
—
vanadium
NA
NA
7
zinc
NA
2000
—
1 MCL=Maximum Contaminant Levels. Source: EPA Office of Water, "Drinking Water Standards and
Health Advisories", EPA Document 822-R-04-005, Summer 2006 Edition.
2 HAL= Health Advisory Level (Lifetime). Source: EPA Office of Water, "Drinking Water Standards and
Health Advisories", EPA Document 822-R-04-005, Summer 2006 Edition.
3 Iowa Statewide Groundwater Standards = statewide standards for groundwater in a protected groundwater
source. Source: Subrule 567 Iowa Administrative Code (IAC) 137.5(4)(a).
NA= None Available.
— = HAL not used for groundwater monitoring level if MCL available. Iowa Statewide Groundwater
Standard not used for monitoring level if MCL or HAL available.
All units are micrograms per liter (ug/L).
Bold values = chemical-specific ARAR concentration values to be used as monitoring levels for inorganic
compounds in groundwater monitoring program. Detection limits and/or reporting limits may alter the
monitoring levels for certain compounds due to limitations associated with currently available analytical
laboratory procedures.
C:\Users\v-cookp\Documents\Davenport\Remediation-CD\Remedial Action\LTGWM\GW Mon Rpts\151201 Event\Final to
EPA\pdf\Table 2-2.docx
-------
Table 2-3
Groundwater Monitoring Activities and Compliance Points (2014-2017)
Arconic-Davenport Works
Monitoring Wells
Routine Fluid
Levels Only
Routine Fluid
Levels and
Sampling
Compliance
Point1
Upgrad
ent Monitoring Well Locations
CD
X
CI
X
Plant Interior Monitoring Well Locations
BD
X
Bl
X
DD
X
Dl
X
DS
X
GD
X
Gl
X
GMFM-07
X
GMSR-01
X
Ml
X
Western Facility Boundary Monitoring Well Locations
ED
X
X
El
X
X
ES
X
X
HNI
X
X
HS(S)
X
X
HX
X
X
LNI
X
X
LS(S)
X
X
PA-14S
X
X
PA-17S
X
X
WA-011
X
X
WDS-2
X
X
WDS-3
X
X
River Shoreline Monitoring Well Locations
AD
X
X
Al
X
X
ANS
X
X
AS
X
X
|AX
X
X
EDS-2
X
X
GM-03
X
GM-04R
X
X
GM-05
X
GM-06R
X
X
GM-08D
X
GM-09
X
X
GM-10
X
X
Jl
X
X
JS
X
X
J:\Projects\Arconic\Davenport\180111 Davenport 3Q17 GW Monitoring Report\Tables\Table 4-l.xlsx
Page 1 of 2
-------
Table 2-3
Groundwater Monitoring Activities and Compliance Points (2014-2017)
Arconic-Davenport Works
Monitoring Wells
Routine Fluid
Levels Only
Routine Fluid
Levels and
Sampling
Compliance
Point1
JX
X
X
KD
X
X
Kl
X
X
KS
X
X
LBD-01U
X
X
WDS-5
X
X
Eastern Facility Boundary Monitoring Well Locations
FD
X
X
Fl
X
X
FS
X
X
NEA-02I
X
X
NEA-01I
X
X
Nl
X
X
NS
X
X
OID (intermediate zone)
X
X
OID (deep zone)
X
X
OS
X
X
'Refer to Section 5.5
J:\Projects\Arconic\Davenport\180111 Davenport 3Q17 GW Monitoring Report\Tables\Table 4-l.xlsx
Page 2 of 2
-------
Table 2-4
Groundwater Monitoring Activities and Compliance Points (2018-Present)
Arconic-Davenport Works
Monitoring Wells
Routine Fluid
Levels
Semi-Annual
Sampling (March
and September)
Annual Sampling
(September)
FYR Sampling1
(all parameters)2
Compliance
Point3
Upgrad
ent Monitoring Well Locations
CD
X
CI
X
Plant Interior Monitoring Weil Locations
BD
X
Bl
X
DD
X
Dl
X
DS
X
GD
X
Gl
X
GMCM-10
X
GMFM-07
X
GMSR-01
X
Ml
X
Western Facility Boundary Monitoring Well Locations
ED
X
X
X
El
X
X
X
ES
X
X
X
HNI
X
! X
X
X
HS(S)
X 7
X
X
X
HX
X
X
X
X
LNI
X
X
i
X
X
LS(S)
X
X
X
X
PA-14S
X
X
X
X
PA-17S
X
X
X
X
WA-011
X :
X
WDS-2
X
X
X
WDS-3
X
X
X
River Shoreline Monitoring Well Locations
AD
X
X
X
X
Al
X
X
X
X
ANS
X
X
X
X
AS
X
X
X
X
AX
X
X
X
EDS-2
X
X
X
X
GM-03
X
GM-04R
X
X
X
X
GM-05
X
GM-06R
X
X
X
X
GM-07
X
GM-08D
X
GM-09
X
X
X
X
Page 1 of 2
-------
Table 2-4
Groundwater Monitoring Activities and Compliance Points (2018-Present)
Arconic-Davenport Works
Monitoring Wells
Routine Fluid
Levels
Semi-Annual
Sampling (March
and September)
Annual Sampling
(September)
FYR Sampling1
(all parameters)2
Compliance
Point3
GM-10
X
X
X
X
Jl
X
X
X
X
JS
X
X
X
X
JX
X
X
X
X
KD
X
X
X
Kl
X
X
X
KS
X
X
X
LBD-01U
X
X
X
X
WDS-5
X
X
X
X
Eastern Facility Boundary Monitoring Well Locations
FD
X
X
X
Fl
X
X
X
FS
X
X
X
NEA-021
X
X
X
NEA-011
X
X
X
X
Nl
X
X
X
NS
X
X
X
OID (intermediate zone)
X
X
X
OID (deep zone)
X
X
X
OS
X
X
X
1The next Five Year Review (FYR) sampling will be in September 2025 before the FYR report is developed in 2026. The same cycle
will be repeated every 5 years.
includes all VOCs, PCBs SVOCs and metals included in Attachments 1 and 2 of the Consent Decree SOW.
3Refer to Section 5.5
Page 2 of 2
-------
TABLE 2-5
Chemical-specific Performance Standards for Groundwater Treatment System Effluent
Alcoa/Davenport Works
Riverdale, Iowa
Compound
Effluent Performance Standard
cis-1,2-dichloroethene
78 |xg/L
trichloroethene
10 |xg/L
tetrachloroethene
33 |ig/L
-------
TABLE 2-6
Chemical-specific Monitoring Parameters for Effluent Monitoring Program
Alcoa/Davenport Works
Riverdale, Iowa
Volatile Organic Compounds (VOCs)
1,1,1 -trichloroethane
acetone
1,1,2,2-tetrachloroethane
carbon disulfide
1,1,2-trichloroethane
chloroethane
1,1 -dichloroethane
chloroform
1,1 -dichloroethene
vinyl chloride
1,2-dichloroethane
methylene chloride (dichloromethane)
trans-1,2-dichloroethene
benzene
1,2-dichlorobenzene
ethylbenzene
1,3 -dichlorobenzene
toluene
1,4-dichlorobenzene
xylenes
Polychlorinated Biphenyls (PCBs)
PCB - Aroclor 1242
PCB-Aroclor 1254
PCB - Aroclor 1248
Polynuclear Aromatic Hydrocarbons (PAHs)
acenaphthene
chrysene
anthracene
dibenz(a,h)anthracene
benzo(a)anthracene
fl uoranthene
benzo(a)pyrene
fluorene
benzo(b)fl uoranthene
indeno( 1,2,3-cd)pyrene
benzo(g,h,i)perylene
naphthalene
benzo(k)fluoranthene
pyrene
Inorganic Compounds
aluminum
cyanide
arsenic
iron
barium
lead
beryllium
manganese
cadmium
mercury
chromium
nickel
cobalt
vanadium
copper
zmc
-------
Geosyntec Consultants
Table 3-1
Passive Subslab Vapor Sampling Results
Arconic-Davenport Works Site
Riverdale, Iowa
Sample ID
Collection
Date
Mass
PCE
TCE
cis-l,2-DCE
trans-l,2-DCE
VC
Methylene
Chloride
1,1-DCA
1,1,1-TCA
MIBK
SS-3
10/25/2018
388
6 J
10 U
10 U
10 U
25 U
25 U
25 U
861
SS-4
10/25/2018
1,328
35
205
22
23
25 U
25 U
25 U
875
SS-6
10/25/2018
2,387
20
10 U
10 U
10 U
25 U
25 U
25 U
258
SS-8
4/11/2019
162
10 U
26
28
10 U
25 U
25 U
25 U
826
SS-10
10/25/2018
65,945
59,627
100,281
8,468
46,084
25 U
76
25 U
285
SS-12
10/25/2018
7,668
534
1,597
12
147
25 U
25 U
25 U
104
SS-15
10/25/2018
83
10 U
31
10 U
15
25 U
25 U
25 U
224
SS-16
10/25/2018
12,748
20,390
25,314
653
257
25 U
159
35
215
SS-18
10/25/2018
294
17
10 U
10 U
10 U
25 U
25 U
25 U
304
SS-20
10/25/2018
289
23
10 U
10 U
10 U
25 U
25 U
25 U
337
SS-22
10/25/2018
926
840
3,090
216
402
25 U
36
25 U
324
SS-23
10/25/2018
45,468
41,121
18,369
693
357
25 U
1,010
52
375
SS-24
10/25/2018
9,191
5,396
2,786
128
11
25 U
31
25
287
SS-25
4/11/2019
10,863
2,294
7,071
675
30
25 U
52
25 U
391
SS-27
4/11/2019
2,371
99
38
5 J
10 U
25 U
25 U
141
332
SS-29
4/11/2019
17,950
1,600
125
115
11
25 U
25 U
25 U
950
SS-30
4/11/2019
•
3,707
2,361
233
71
25 U
25 U
25 U
845
SS-31
10/25/2018
39,601
27,570
31,246
2,570
30
25 U
42
35
147
SS-32
4/11/2019
19,529
1,329
413
39
7 J
25 U
25 U
25 U
861
SS-34
4/11/2019
2,398
26
64
6 J
10 U
25 U
25 U
25 U
667
SS-35
10/25/2018
2,170
40
38
10 U
10 U
25 U
25 U
25 U
339
SS-36
10/25/2018
60
10 U
10 U
10 U
10 U
25 U
25 U
25 U
302
SS-37
10/25/2018
175
7 J
9 J
10 U
10 U
25 U
25 U
25 U
275
SS-40
10/25/2018
793
18
8 J
10 U
10 U
25 U
25 U
25 U
268
SS-41
4/11/2019
4,194
613
291
19
7 J
25 U
25 U
25 U
638
SS-43
4/11/2019
19,850
437
193
15
5 J
25 U
25 U
25 U
431
SS-44
10/25/2018
949
39
156
8 J
10 U
25 U
25 U
25 U
1,056
SS-47
4/11/2019
27,199
17,128
9,742
415
63
25 U
25 U
25 U
852
SS-49
10/25/2018
6,258
3,450
12,034
1,285
17
25 U
25 U
44
326
SS-50
4/11/2019
63,280
101,798
253,687
85,656
2,003
25 U
25 U
25 U
211
SS-51
10/25/2018
211
7 J
14
10 U
10 U
25 U
25 U
25 U
126
SS-52
10/25/2018
7,851
269
11
10 U
10 U
25 U
25 U
25 U
124
-------
Geosyntec Consultants
Table 3-1
Passive Subslab Vapor Sampling Results
Arconic-Davenport Works Site
Riverdale, Iowa
Sample ID
Collection
Date
Mass
PCE
TCE
cis-l,2-DCE
trans-l,2-DCE
VC
Methylene
Chloride
1,1-DCA
1,1,1-TCA
MIBK
SS-54
10/25/2018
2,296
16
10 U
10 U
10 U
25 U
25 U
25 U
207
SS-55
10/25/2018
49
10 U
6 J
10 U
10 U
25 U
25 U
25 U
304
SS-56
10/25/2018
864
57
10 U
10 U
10 U
25 U
25 U
25 U
1,164
SS-57
10/25/2018
42,127
37,737
31,988
1,162
60
25 U
2,211
193
209
SS-58
10/25/2018
5,829
155
33
10 U
10 U
25 U
25 U
25 U
41
SS-60
10/25/2018
19,421
321
15
10 U
11
25 U
25 U
25 U
25
SS-62
10/25/2018
19,186
635
19
10 U
10 U
25 U
25 U
25 U
186
SS-64
10/25/2018
10,903
108
15
10 U
20
25 U
25 U
101
200
SS-65
10/25/2018
20,231
1,718
296
10 U
12
25 U
25 U
151
226
SS-68
10/25/2018
11
10 U
10 U
10 U
10 U
25 U
25 U
25 U
239
SS-80
11/14/2018
28
10 U
10 U
10 U
10 U
25 U
25 U
25 U
173
SS-81
11/14/2018
59
10 U
10 U
10 U
10 U
25 U
25 U
25 U
104
SS-82
11/14/2018
78
10 U
10 U
10 U
10 U
25 U
25 U
25 U
90
SS-83
11/14/2018
471
10 U
10 U
10 U
10 U
25 U
25 U
25 U
157
SS-84
11/14/2018
87
10 U
10 U
10 U
10 U
25 U
25 U
25 U
120
SS-86
11/14/2018
833
10 U
10 U
10 u
10 U
25 U
25 U
25 U
169
SS-87
11/14/2018
73
10 U
10 U
10 u
10 U
25 U
25 U
25 U
188
SS-88
11/14/2018
114
10 U
10 U
10 u
10 U
25 U
25 U
25 U
54
SS-92
4/11/2019
6,730
386
3,783
239
9 J
25 U
25 U
25 U
651
SS-93
4/11/2019
25,290
17,919
4,645
520
51
25 U
25 U
30
763
SS-94
4/11/2019
21,284
28,439
33,937
2,891
2,002
25 U
50
25 U
1,705
SS-96
4/11/2019
13,612
1,773
5,250
274
484
25 U
25 U
25 U
654
SS-99
4/11/2019
629
18
103
39
10 U
25 U
25 U
25 U
280
SS-101
4/11/2019
17
10 U
62
66
10 U
25 U
25 U
25 U
247
SS-102
4/11/2019
7,519
84
225
103
7 J
25 U
25 U
25 U
1,217
SS-103
4/11/2019
356
16
146
6 J
10
25 U
25 U
25 U
658
SS-104
4/11/2019
23,869
446
56
6 J
5 J
25 U
25 U
25 U
579
SS-106
4/11/2019
1,232
61
660
14
6 J
25 U
25 U
25 U
192
SS-114
4/11/2019
11,514
376
224
21
6 J
25 U
25 U
26
542
SS-115
4/11/2019
4,037
120
656
73
9 J
25 U
25 U
25 U
485
SS-116
4/11/2019
11,739
1,260
311
29
10 J
25 U
25 U
25 U
1,667
Notes:
All masses are shown in nanograms (ng).
J Indicates that the mass is an estimated value.
U Indicates that the constituent was not detected.
PCE Tetrachloroethene TCE Trichloroethene DCE Dichloroethene
VC Vinyl Chloride DCA Dichloroethane TCA Trichloroethane
MIBK methyl isobutyl ketone
-------
Geosyntec Consultants
Table 3-2
Cross Slab Pressure Differential Monitoring Results - February-March and March-April 2019
Arconic-Davenport Works Site
Riverdale, Iowa
Location ID
Area of Plant
Date
Differential Pressure (Pa)
Interpretation
Average
Range of
variability
(min. max)
SS-97
Near 86"
Line
Feb-March 19
0.041
-3.99,4.37
Neutral
Less driving force
for VI
March-April 19
0.092
-4.11, 3.68
Neutral
SS-98
S of 84"
Line #2
Feb-March 19
0.74
-9.99, 21.43
Neutral/slight
pressure
gradient from
IA to SS
March-April 19
0.31
-11.49,19.33
Neutral/slight
pressure
gradient from
IA to SS
SS-108
Near 60"
Line
Feb-March 19
-2.0
-17.06,1.22
Pressure
gradient from
SS to IA
Greater driving
force for VI
March-April 19
-1.3
-9.99, 2.91
Pressure
gradient from
SS to IA
SS-111
N of 84"
Line #1
Feb-March 19
-1.9
-6.97, 0.81
Pressure
gradient from
SS to IA
March-April 19
-1.2
-8.28, 2.87
Pressure
gradient from
SS to IA
Notes:
Pa Pascal
SS Subslab
IA Indoor Air
VI Vapor Intrusion
-------
Table 3-3 Geosyntec Consultants
Detailed Chemical Inventory
Arconic-Davenport Works Site
Riverdale, Iowa
Material Name
SlteHawklD
Manufacturer
Ingredient
Ingredient CAS
Areas of Use within the Plant
2C form-A-Gasket #2 Sealant 110Z
1677
ITW Permatex
4-methyl-2-pentanone
J108-10-1
Roll Shop, Utilities, FQA, Rolling, Hot Line, Rolling Hotline
Maintenance, Rolling Hot Line Production, Cold Mills,
Rolling Cold Mills Maintenance, Sheet Finishing, West End
Maintenance
Industrial Enamel Ultradeep Base
25897
Sherwin-Williams Company
4-methyl-2-pentanone
108-10-1
Industrial Enamel VOC Pure White
235691
Sherwin-Williams Company
4-methyl-2-pentanone
108-10-1
Central Maintenance, Machine Shop, Ingot Plant, Ingot
Production
Direct-to-Metal Alkyd Enamel Pure White
270587
Sherwin-Williams Company
4-methyl-2-pentanone
1108-10-1
Carpenters & Painters
Industrial Enamel Deep Base
273975
Sherwin-Williams Company
4-methyl-2-pentanone
108-10-1
Central Maintenance, Machine Shop, Carpenters &
Painters
Reducer No. 15
276223
Sherwin-Williams Company
4-methyl-2-pentanone
108-10-1
Central Maintenance, Machine Shop, Carpenters &
Painters
Industrial Enamel VOC Ultradeep Base
296802
Sherwin-Williams Company
4-methyl-2-pentanone
108-10-1
Central Maintenance, Carpenters & Painters
Industrial Enamel VOC Safety Orange
312181
Sherwin-Williams Company
4-methyl-2-pentanone
108-10-1
Central Maintenance, Roll Shop, Utilities, 854 Roll Shop,
Carpenters & Painters, Ingot Plant, Ingot Production, Plate
Mill, Plate Mill Production, Roiling, Hot Line, Rolling Hot
Line Production, Cold Mills, Rolling Cold Mills Production,
Sheet Finishing, Coil Sheet, Sheet Finishing Coil Sheet
Production
MO Machinery Gray 6U
341899
Valspar Corporation - Architectural Coatings Division
4-methyl-2-pentanone
108-10-1
Central Maintenance, Utilities, Truck Repair, Scale Repair,
Training & Reliability, Ingot Plant, Ingot Production, IPS,
Plate Mill, Plate Mill Production, Rolling, Hot Line, Rolling
Hot Line Maintenance, Rolling Hot Line Production, Cold
Mills, Rolling Cold Mills Maintenance, Rolling Cold Mills
Production, Sheet Finishing, Coil Sheet, Sheet Finishing Coil
Sheet Production, Flat Sheet, Sheet Finishing Flat Sheet
Production, OA Labs, Met Lab
]Kem Bond* HS High Solids Alkyd Universal Metal Primer Gray
353600
Sherwin-Williams Company
4-methyl-2-pentanone
108-10-1
Contractor
Krylon* Interior/Exterior Paint Khaki (Beige)
365571
Sherwin-Williams Company, Krylon Products Group
4-methyl-2-pentanone
108-10-1
Central Maintenance, Utilities
Pro Industrial Urethane Alkyd Enamel Safety Yellow
378158
Sherwin-Williams Company, Diversified Brands
4-methyl-2-pentanone
108-10-1
Kem Bond* HS High Solids Alkyd Universal Metal Primer Off Whitd488066
THE SHERWIN-WILLIAMS COMPANY
4-methyl-2-pentanone
108-10-1
Rolling, Hot Line, Rolling Hot Line Maintenance
Barsol A-3200
506146
Barton Solvents, Inc.
4-methyl-2-pentanone
108-10-1
OA Labs, Quant Lab
Aerosol Spray Paint
523408
Plasti-Kote Co., Inc.
4-methyl-2-pentanone
108-10-1
Machine Shop
A/R SPRSAFYL0 6UC
683708
Valspar Corporation
4-methyl-2-pentanone
108-10-1
Rolling, Hot Line, Rolling Hot Line Production
Mercury Mach-7* Industrial Enamel, Safety Yellow
684412
Sherwin-Williams Co
4-methyl-2-pentanone
1108-10-1
Central Maintenance, Machine Shop, Scale Repair,
Carpenters & Painters, Crane Repair, Ingot Plant, Ingot
Production, IPS, Plate Mill, Plate Mill Production, Rolling,
Hot Line, Rolling Hot Line Maintenance, Rolling Hot Line
Production, Cold Mills, Rolling Cold Mills Maintenance,
Rolling Cold Mills Production, Sheet Finishing, Coil Sheet,
Sheet Finishing Coil Sheet Production, Flat Sheet, Sheet
Finishing Flat Sheet Production
Krylon* interior/Exterior Paint Gloss Black
1055340
Sherwin-Williams Company, Krylon Products Group
4-methyl-2-pentanone
108-10-1
Central Maintenance, Carpenters & Painters
Super Enamel
1273435
Plasti-Kote Co., Inc.
4-methyl-2-pentanone
108-10-1
Central Maintenance, Machine Shop
CP-Lube (Poxylube CP-200) -Air Drying Dry Film Lubricant
1469902
Sandstrom Products Company
4-methyl-2-pentanone
108-10-1
Central Electrical Maintenance
1C Form-A-Gasket Ml Sealant 110Z
1528411
ITW Permatex
4-methyl-2-pentanone
108-10-1
Utilities, Sheet Finishing, West End Maintenance
Zinsser Seal Coat
1552050
Rust-Oleum Corporation
4-methyl-2-pentanone
1108-10-1
Central Maintenance, Carpenters & Painters
3D Aviation Form-A-Gasket #3 Sealant 1PT
1588599
ITW Permatex
4-methyl-2-pentanone
108-10-1
Truck Repair
3M™ Electrical Insulating Sealer 1602-R, Red
1718419
3M
4-methyl-2-pentanone
108-10-1
Rolling, Cold Mills, Rolling Cold Mills Maintenance
Aerosol Lacquer Sanding Sealer
1846955
Deft, Inc.
4-methyl-2-pentanone
1108-10-1
Carpenters & Painters
Ethyl Alcohol Denatured
1848058
Fisher Scientific
4-methyl-2-pentanone
1108-10-1
Central Maintenance, Machine Shop
-------
Table 3- 3 Geosyntec Consultants
Detailed Chemical Inventory
Arconic-Davenport Works Site
Riverdale, Iowa
Material Name
SlteHawk ID
Manufacturer
Ingredient
(ingredient CAS (Areas of Use within the Plant
Wise Chem E-212-F Part B
1979579
Wise Chem LLC
4-methyl-2-pentanone
1108-10-1
fCentral Maintenance, Store Room, Scale Repair,
[Carpenters & Painters, Ingot Plant, Brickmasons & Ingot
[Maintenance, Rolling, Hot Line, Rolling Hot Line
[Maintenance
JLG Orange
2145635
Lawson Products, Inc.
4-methyl-2-pentanone
108-10-1
(Central Maintenance, Truck Repair
iPro Industrial Urethane Alkyd Enamel Safety Yellow
2213425
Sherwin-Williams Company
4-methyl-2-pentanone
108-10-1
Barsol A-1032
2401654
Barton Solvents, Inc.
4-methyl-2-pentanone
1108-10-1
Maintenance - General, Roll Shop, Store Room, Utilities,
|Machine Shop, Truck Repair, Scale Repair, Central
Electrical Maintenance, Weld Shop, Oilers, FQA,
Carpenters & Painters, Crane Repair, Training & Reliability,
FSD, Open Stores, Rubber Roll Shop, Weld Lab, Utilities,
Mechanical, Contractor, Veolia, Solenis, EHS, Plant
Protection, Fire Department, Medical, Ingot Plant, Ingot
Production, Brickmasons & Ingot Maintenance, New to
Review, IPS, Plate Mill, Plate Mill Production, Plate Mill
|Maintenance, RAP, Rolling, Hot Line, Rolling Hot Line
Maintenance, Rolling Hot Line Production, Cold Mills,
Rolling Cold Mills Maintenance, Rolling Cold Mills
Production, Sheet Finishing, Coil Sheet, Sheet Finishing Coil
Sheet Production, Flat Sheet, Sheet Finishing Flat Sheet
Production, West End Maintenance, OA Labs, Chem Lab,
Met Lab, Physical Testing Lab, Quant Lab, Outdoors/
Grounds, Water Treatment Facility
Ultra Seal-Hesive
358443
UZ Engineered Products
Tetrachloroethylene
127-18-4
[Central Maintenance, Truck Repair, Finishing, Sheet, West
End Maintenance
Descaler2
2145797
Am rep. Inc. (Cartersville)
Tetrachloroethylene
J127-18-4
Sheet Finishing, Coil Sheet, Sheet Finishing Coil Sheet
[production
Contact Cleaner 2000* Precision Cleaner
35553
CRC Industries, Inc.
trans-l,2-Dichloroethylene
156-60-5
jMachjne shop
Belzona* 9411 (Release Agent)
1732379
Belzona Polymeries Limited
trans-l,2-Dichloroethylene
156-60-5
[Central Maintenance, A/C Repair
Locquic(R) Primer T (Aerosol)
1866824
Henkel Loctite Corporation
1,1,1-Trichloroethane
71-55-6
Central Maintenance, Roll Shop, EHS, Rolling, Hot Line,
Rolling Hot Line Maintenance, Cold Mills, Rolling Cold Mills
Maintenance, Sheet Finishing, West End Maintenance
Tri-Flow/Tri-Flow Aerosol
2112784
Thompson 8i Formby Inc.
1,1,1-Trichloroethane
171-55-6
(Rolling, Hot Line, Rolling Hot Line Production
Tap Magic Cutting Fluid
2121008
Sigma-Aldrich
1,1,1-Trichloroethane
71-55-6
[Central Maintenance, Machine Shop, Central Electrical
[Maintenance, Weld Shop, Oilers, FQA, Carpenters &
[Painters, Crane Repair, FSD
Descaler2
2145797
Amrep, Inc. (Cartersville)
1,1,1-Trichloroethane
71-55-6
[sheet Finishing, Coil Sheet, Sheet Finishing Coil Sheet
[Production
Rapid Tap (1,1,1-Trichloroethane)
2146691
Realton Corporation (Dis by Herric Ind Supply Co.
1,1,1-Trichloroethane
71-55-6
(QA Labs, Physical Testing Lab
MS-190 Flux Remover
16775
Miller Stephenson Chemicals Co., Inc.
Methylene chloride
75-09-2
Central Maintenance, Central Electrical Maintenance,
[Rolling, Hot Line, Rolling Hot Line Production
Torq "CB"
508895
Kimball-Midwest
Methylene chloride
75-09-2
jCentral Maintenance, Truck Repair
UT-R20 Hardener
627057
Rema Tip Top/North America, Inc.
Methylene chloride
75-09-2
[plate Mill, Plate Mill Maintenance, Sheet Finishing, West
[End Maintenance
Non-Flammable Rubber Cement
1515559
Plews/Edelmann
Methylene chloride
75-09-2
j
i001-620 Anchor Solvent Based Anti-Spatter (Aerosol)
1745286
KCI, Inc.
Methylene chloride
75-09-2
iMethylene Chloride
1912482
Fisher Scientific
Methylene chloride
175-09-2
iQA Labs, Chem Lab
Spray Adhesive
2112380
Bowman Distribution
Methylene chloride
75-09-2
IRolling, Hot Line, Rolling Hot Line Production
XL-500-X2
2145659
Normac Adhesive Products Inc.
Methylene chloride
75-09-2
[sheet Finishing, West End Maintenance
Descaler2
2145797
Amrep, Inc. (Cartersville)
Methylene chloride
75-09-2
[Sheet Finishing, Coil Sheet, Sheet Finishing Coil Sheet
[production
-------
Table 3-3 Geosyntec Consultants
Detailed Chemical Inventory
Arconic-Davenport Works Site
Riverdale, Iowa
Material Name
SlteHawklD
(Manufacturer
Ingredient
(ingredient CAS
Areas of Use within the Plant
SC-2000 Cement
385646
iRema Tip Top/North America, Inc.
Trichloroethylene
79-01-6
Central Maintenance, Utilities, Scale Repair, FQA, Plate
Mill, Plate Mill Maintenance, Sheet Finishing, West End
Maintenance
Plastic Cement
512457
iRema Tip Top/North America, Inc.
Trichloroethylene
|79-01-6
Central Maintenance, Utilities, Plate Mill, Plate Mill
Maintenance, Rolling, Hot Line, Rolling Hot Line
Maintenance, Sheet Finishing, West End Maintenance
Non-Flammable Rubber Cement
1515559
IPIews/Edelmann
Trichloroethylene
79-01-6
C320 White Cement (SC2000 White) (Non-Flammable)
1857770
Rema Tip Top - North America
Trichloroethylene
79-01-6
No. C320 Cement
2145733
(Rema-Tech
Trichloroethylene
79-01-6
Central Maintenance, Truck Repair
Non-Flammable Rubber Cement, Vulcanizing Solution
2146486
Ningbo Autowin Tools Co., Ltd.
Trichloroethylene
79-01-6
Central Maintenance, Roll Shop, Store Room, 854 Roll
Shop, Open Stores
-------
Table 4-1
Groundwater Sample Analytical Results - 1st Quarter 2017
Alcoa-Davenport Works
Sample ID1
SOW
Cone2
AD-170316
AM70315
ANS-170315
AS-170315
AX-170316
ED-170321
EDS-2-170315
EM 70321
ES-170321
FD-170322
FI-170320
FS-170323
FS-170323-F
SamDllna Data
"3/16/17
3/15/17
3/15/17
3/15/17
3/16/17
3/21/17
3/15/17
3/21/17
3/21/17
3/22/17
3/26/17
3/23/17
3/23/17
Volatile* (ug/L)
111-Trichloroe thane
200
1 U
1 U
2 U
1 U
1 U
1 U
1 U
4 U
1 U
1 U
1 U
1 U
1 12 2-Tetrachloroethane
0.3
1 U
1 U
2 U
1 U
1 U
1 U
1 U
4 U
1 U
1 U
1 U
1 U
1 1 2-Trichk>roe1hane
5
1 u
1 U
2 U
1 U
1 U
1 U
1 U
4 U
1 U
1 U
1 U
1 U
11-Dichloroethane
140
1 u
1 U
2 U
1 U
1 U
1 U
1 U
4 U
1 U
1 U
2.3
1 U
1,1-Dichloroethene
7
1 u
1 U
2 U
1 U
1 u
1 U
1 U
4 U
1 U
1 U
0.58 J
1 U
1 2-Dichtorobenzene
600
1 u
1 U
20
1 U
1 u
1 U
1 U
4 U
1 U
1 U
1 U
1 U
1 2-Dchbroethane
5
1 u
1 U
2 U
1 U
1 u
1 U '
"Tu
4 U
1 U
1 U
1 U
1 U
2-Butanone (MEK)
4000
10 u*
10 IT
3.5 J*
10 U*
10 u*
10 u
10 u*
40 U
10 U
10 U
10 U
10 U
Acetone
6300
2.7 J
10 U
62
8.3 J
10 u
10 u
3.1 j
40 U
10 U
10 U
10 U
10 U
Acrolein
3.5
20 U
20 U
40 U
20 U
20 u
20 U
20 U
80 U
20 U
20 U
20 U
20 U
Benzene
5
1 U
1 U
2 U
1 U
1 u
1 u
1 U
990
1 U
1 U
1 U
1 U
Bromofbrm
ao
1 U
1 U
2 U
1 U
1 u
1 U
1 u
4 U
1 U
1 U
1 U
1 U
Carbon diauffide
700
1 U
1 U
2 U
1 U
1 u
1 u
1 u
4 U
1 U
0.41 J
1 U
1 U
Carbon tetrachloride
5
1 U
1 U
2 U
1 U
1 u
1 u
1 u
4 U
1 U
1 U
1 U
1 U
Chlorobenzene
100
1 U
1 U
2 U
1 U
1 u
1 u
1 u
4 U
1 U
1 Li
1 U
1 U
Chloroethane
60
1 U
1 U
2 U
1 U
1 u
1 u
1 u
4 U
1 U
1 U
1 U
1 U
Chloroform
60
1 U
1 U
2 U
1 U
1 u
1 u
1 u
4 U
1 U
1 Li
1 U
1 U
Chtoromethane
30
1 U
1 u
2 U
1 U
1 u
1 u
1 u
4 U
1 U
1 U
1 U
1 U
cis-1 2-Dichloroethene
70
1 U
1 u
2.3
0.97 J
1 u
1 u
3.7
4 U
1 U
1 U
1 U
1 U
Dibromochloromethane
60
1 U
1 u
2 U
1 U
1 u
1 u
U
4 U
1 U
1 U
1 U
1 U
Ethvlbenzene
700
1 U
1 u
2 U
1 U
1 u
1 u
U
6.1
1 U
1 U
1 U
1 U
Methyl isobutvl ketone
560
10 u
10 u*
20 U*
10 U*
10 u
10 u
10 u*
40 U
10 U
10 U
10 U
10 U
Methylene Chloride
5
1 u
1 u
2 U
1 U
1 u
u
u
4 U
1 U
1 U
1 U
1 U
Tetrachtoroethene
5
1 u
1 u
2 U
1 U
1 u
u
06 J
4 U
1 U
1 U
1 U
1 U
Toluene
1000
1 u
1 u
2 U
1 U
1 u
1 u
u
20
1 u
1 U
1 U
1 u
trans-1 2-Dichloroethene
100
1 u
1 u
2 U
1 U
1 u
1 u
u
4 U
1 u
1 U
1 U
1 u
nins-1 3-DichloroDroDene
1.6
1 u
1 u
2 U
1 U
1 u
1 u
u
4 U
1 u
1 U
1 u
1 u
Trichloroethene
5
1 u
1 u
2 U
1 U
1 u
1 u
1.1
4 U
1 u
1 U
1 u
1 u
Vinyl chloride
2
1 u
1 u
1 J
1 U
1 u
1 u
u
4 U
1 u
1 U
1 u
1 u
Xylenes, Total
10000
2 U
2 U
4 U
2 U
2 U
2 U
2 U
37
2 U
2 U
2 U
2 U
Semhrolatllea (ufl/L)
Acenaohthene
420
0.19 U
0.19 U
0.19 U
0.19 U
0.19 U
0.19 U
0.19 U
1.3
0.19 U
0.19 U
0.19 U
0.19 U
0.19 U
Anthracene
2100
0.19 U
0.19 U
0.19 U
0.19 U
0.19 U
0.19 U
0.19 U
0.19 U
0.19 U
0.19 U
0.19 U
0.19 U
0.19 U
Benzfalanthracene
0.24
0.19 U
0.19 U
0.19 U
0.19 U
0.19 U
0.19 U
0.19 U
0.19 U
0.19 U
019 U
0.19 U
0.19 U
0.19 U
Benzo[alovrene
0.2
0.19 U
0.19 U
019 U
0.19 U
0.19 U
0.19 U
0.19 U
0.19 U
0.19 U
0.19 U
0.19 U
0.19 U
0.19 U
Benzofblfluoranthene
0.24
0.19 U
0.19 U
0.19 U
0.19 U
0.19 U
0.19 U
0.19 U
0.19 U
0.19 U
0.19 U
0.19 U
0.19 U
0.19 U
BenzoFk]fluoranthene
2.4
0.19 U
0.19 U
0.19 U
0.19 U
0.19 U
0.19 U
0.19 U
0.19 U
0.19 U
019 U
019 U
0.19 U
0.19 U
Chrysene
24
0.19 U
0.19 U
0.19 U
0.19 U
0.19 U
0.19 U
0.19 U
019 U
0.19 U
0.19 U
0.19 U
0.19 U
0.19 U
Dibenzfa h)anthracana
0.024
0.19 U
0.19 U
0.19 U
0.19 U
0.19 U
0.19 U
0.19 U
0.19 U
0.19 U
0.19 U
0.19 U
0.19 U
0.19 U
Dki-butyl ohthalate
700
4.6 U
4.8 U
4.8 U
4.8 U
4.6 U
48 U
4.8 U
48 U
4.8 U
4.6 U
4.8 U
4.8 U
4.8 U
Fluoranthene
260
0.19 U
0.19 U
0.19 U
0.19 U
0.19 U
0.19 U
0.19 U
0.19 U
0.19 U
0.19 U
0.19 U
0.19 U
0.19 U
Fluorene
260
0.19 U
0.19 U
0.19 U
0.19 U
0.19 U
0.19 U
0.19 U
1.1
0.19 U
0.19 U
0.19 U
0.19 U
0.19 U
IndenoH 2 3-cd]pyrene
0.24
0.19 U
0.19 U
0.19 U
0.19 U
0.19 U
0.19 U
019 U
0.19 U
0.19 U
0.19 U
0.19 U
0.19 U
0.19 U
Naphthalene
100
0.19 U
0.19 U
0.19 U
0.19 U
0.19 U
0.19 U
0.19 U
0.68
0.19 U
0.19 U
0.19 U
0.19 U
0.19 U
Phenol
2000
0.96 U
0.95 U
0.96 U
0.95 U
0.96 U
0.95 U
0.95 U
1.1
0.95 U
0.95 U
0.95 U
0.96 U
0.95 U
Pyrene
210
0.19 U
0.19 U
0.19 U
0.19 U
0.19 U
0.19 U
0.19 U
0.19 U
0.19 U
0.19 U
0.19 U
0.19 U
0.19 U
PCBa (ua/U
Aroctor-1242
0.5
0.096 U
0.15
0.48 U
0.095 U
0.096 U
0.096 U
0.096 U
0.096 U
0.095 U
0.096 U
0.096 U
0.1 U
0.096 U
Arodor-1248
0.5
0.098 U
0.095 U
4.3
1.7
0.096 U
0.096 U
0.096 U
0.096 U
0.095 U
0.096 U
0.096 U
0.1 U
0.096 U
Aroctor-1254
0.5
0.096 U
0.095 U
0.46 U
0.095 U
0.096 U
0.096 U
0.096 U
0.096 U
0.095 U
0.096 U
0.096 U
0.1 U
0.096 U
Metals fuafU
Aluminum
7000
99
61
54
50 U
50 U
23 J
130
50 U
50 U
50 U
50 U
50 U
50 U
Aisenic
10
0.69 J
1.3 J
11
3.9 J
5 U
0.65 J
6.2
0.64 J
0.88 J
0.72 J
0.65 J
2.7 J
1.6 J
Barium
2000
230 B
270
1600
200
170 B
300 B
230
200 B
130 B
310 B
290 B
270 B
260 B
Beryllium
4
1 U
1 U
1 U
1 U
1 U
1 U
U
U
1 U
1 U
1 U
1 U
1 U
Cadmium
5
1 U
1 U
1 U
1 U
1 U
1 U
U
U
1 U
1 U
1 U
1 U
1 U
Chromium
100
0.95 J
2 U
0.32 J
0.35 J
2 U
0.44 J B
0.37 J
0.34 J B
2 U
0.39 J
2 U
2 U
2 U
Cobalt
140
1.5
0.16 J
0.34 J
1.5
1 U
0.45 J
16
0.16 J
0.25 J
1 U
1 U
1.2
1.2
Coooer
1300
14 B
0.44 J
0.41 J
1.9 J
2 U
2.5 B
0.82 J
2 U
0.47 J B
0.4 JB
2 U
2 U
2 U
Iron
4900
19000 B
4100
11000
6500
1400 B
16000 B
2900
800 B
590 B
17000 B
16000 B
3200 B
690 B
Lead
15
0.36 J
0.17 J
0.29 J
7.9
1 U
0.38 J B
0.28 J
0.24 J B
0.34 JB
1 U
1 U
1 U
1 U
Page 1 of 8
-------
Table 4-1
Groundwater Sample Analytical Results - 1st Quarter 2017
Alcoa-Davenport Works
I Sample ID1
SOW
Cone2
AD-170316 !
AH 70315
ANS-170315
AS-170315
AX-170316
ED-170321
EDS-2-170315
EI-170321
ES-170321
FD-170322
FH 70320
FS-170323
FS-170323-F
L Samollng Date
3/16/17
3/15/17
3/15/17
3/15/17
3/16/17
3/21/17
3/15/17
3/21/17
3/21/17
3/22/17
3/20/17
3/23/17
3/23/17
manganese
300
8.7 B
220
970
1400
18 B
13 B
6500
18 B
17 B
160 B
330
250 B
250 B
Mercury
2
0.2 U
0.2 U
0.2 U
0.2 U
0.2 U
0.2 U
0.2 U
0.2 U
0.2 U
0.2 U
0.2 U
0.2 U
0.2 U
iNickel
too
20
0.92 J
2.5
2.2
2 U
0.52 J
19
2 U
1.9 J
2 U
0.29 J
5.4 B
52 B
IjSelenium
50
5 U I
5 U
5 U
0.56 J
5 U
5 U
0.58 J
5 U
5 U
5 U
5 U
5 U
5 U
HSilver
100
1 U
1 U
1 U
1 U
1 U
1 U
1 U
1 U
1 U
1 U
1 U
1 U
1 U
: thallium
0.5
1 U
1 U
1 U
1 U
1 U
1 U
1 U
1 U
1 U
1 U
1 U
1 U
1 U
IfVanadium
7
5 U
5 U
5 U
1.3 J
5 U
5 U
1.2 J
5 U
5 U
5 U
5 U
5 U
5 U
izinc
2000
15 J
20 U
20 U
20 U
250
8*
20 U
20 U
20 U
64
20 U
20 U
20 U
met Chemistry (ua/i \
jfCvsn*!® Total
10 U
10 U
10 U
10 U
10 U
10 U
2 7 J
10 U
10 U
10 U
, M M,,,,,.,.
10 U
Filtered samples have an "P at the end of the sample ID; duplicate samples have a "0* at the end of the sample ID
Performance Standard for organic*; Monitoring Level for inorganics. Bold indicates the parameter was detected above the SOW Cone
Date Qualifiers (refer to Appendix D for results of data validation)
*: LCS or LCSD exceeds the control limits
B: Compound was found in the blank and sample.
J; Result is less than the RL but greater than or equal to the MDL and the concentration is an approximate value.
U : Indicates the analyte was analyzed for but not detected.
Page 2 of 8
-------
Table 4-1
Groundwater Sample Analytical Results - 1st Quarter 2017
Alcoa-Davenport Works
Sampla ID1
SOW
Cone'
GHMMR-170316
GM-06R-170315
GM-09-170315
GM-1D-170323
HNM 70322
HS(S)-170322
HX-170322
JH70321
JM70321-D
JS-170322
JX-170321
KD-170321
KM70321
3/16/17
3/15/17
3/15/17
3/23/17
3/2^/17
3/22/17
3/22/17
_ 3/21/17
3/21/17
3/2217
3/21/17
3/21/17
3/21/17
irolatllM nxA
[1.1l-Trichtaroethane
200
1 U
1 U
1 U
1 U
1 U
1 U
1 u
1 U
1 u
1 U
1 U
. _ 1 u
1.1 2 2-Tetrachbroethane
0.3
1 U
1U
h 1 u
1U
1 U
i U
1 U
1 u
1 U
1 U
1 U
1 U
H 1 2-Trichloroathane
s
1 U
1 U
1 u
1 U
1 U
U
1U
1 U
1 u
1 u
1 u
1 u
1 u
11-Dichloroethane
140
1 U
1 u
1 u
0.3B J
1 U
6.
1U
1 U _
1 u
1 u
1 u 1
1 u
1 u
1l-Dichloroethene
7
1 U
1 u
1 u
1 U
1 U
2.1
1 u
1U
1 u
1 u
1 u
1 u
1 u
1 2-Dlchlorobenzene
CM"
1 U
1 u
1 u
1 U
1 U
.2 U
1 U
1 U
1 u
1 u
1 u
1U
1U
12-Dichloioeth«ne
... 5
1 U
1 u
1 u
1 u
1 u
2U
1 u
1 u
1 U
1 u
0.32 J
1 u
1 U
2-Butanone (MEK)
4000
10 U*
10 ir
10 u*
10 u
10 u
20 U
10 u
10 u
10 u
10 u
10 U n
10 u
10 u
Acetone
6300
4.7 J
1.9 J
6.6 J
10 u
10 u
20 U
10 u
10 u
10 u
10 u
11
10 u
10 u
Acrolein
3.5 ..
20 U
20 U
20 U
20 U
20 U
40 U
20 U
20 U
20 U
20 U
20 U
20 U
20 u
Benzene
5
1 U
1 U
1 U
1 U
1 U
0.73 J
1 U
.18
19
1 U
2.4
1 u
1 u
Bromoform
B0
1 U
1 U
1 U
1 U
1 U
2U. .
1 u
1U
1 U
1U
1 u
1 U
1U
Carbon dtaulMe
TOO
1 U
1 U
1 U
1 u
1 u
2 U
0.75 J
1 u
6.5
0.72 J
2.3
0.56 J
1U
'srbon tetrachloride
S
1 U
1 U
1 u
r 1 u
2 U
1 U
1U
1 U
1 U
1 U
1U
1U
hlorobenzena
100
1 u
1 U
1 U
1 u
1 u
2 U I
1 U
1 u
1U
1 U
1U
1 U
1 u
Chloroethane
B0
1 u
1 U
1 U
B.5
1 U
2 U
111
1 u
1 U
1 U
1 U
1 u
1U
P| III ¦ ¦ 11 ¦¦¦!
unnnnonn
B0
1 u
1 u
1 U
1 U
1 u
2 U
1 u
1 u
1 U
1 U
1 U
1 u
1U
hloromethane
30
1 u
1 u
1 U
1 U
1 u
2 U
1U
1 u
1 U
1 u
1 U
1U
1U
rm-1 2-Dchloroettiene
70
1 u
1 u
1 U
0.63 J
7.B
410
17
_ 1.B-
1.7
1 u
1U
1 u
1 U
Dbromochloromethene
B0
1 u
1U
1 U
1 U
1 U
2 U
1 U
1 U
1 U
1 U
1 u
1 u
1U
Ethvtwnzene
700
1 u
1 u
1 U
1 U
1 U n
2 U
1 U
1 U
1 U
1 u
1 u
1 u
1U
MethvtbobuM ketone
560
10 u
10 u*
10 U*
10 U
10 u
20 U
10 U
10 u
10 U
10 u
10 u
10 u
10 u
Methylene Chloride
.5
111
1 u
1 U
1 U
111
2 U
1 u
1 u .1
1 U
1 u
1 u
1 u
1 U
Tetrachloroethene
. .5..
1 u
1 U
1U
0.4 J
1U
700
1 U
1U
1 U
1 u
1 u
1 u
1 u
Toluene
1000
1U
1 U
1 u
1 u
1 u
2U
1 u
Tu 1
1 u
1 u
1 u
1U
1 u
liaiw-1 .2-Dichloroethene
100
1 u
1 u
1 u
1 u
1 u
9.B
1 u
1 u
1 u
1 u
1 u
1 u
1 u
inro-1 3-DichloroDropene
1.B
1 u
1 u
1 u
1 u
1 u
2U
1 u
1 u
1 u
1 u
1 u
1 u
1U
|]nchloroethene
5
1 u
~ 1 u
1 u
1 u
1 u
810
1 u
— fu—
1 u
1 u
1 u
1 u
1 u
Ivinvl chloride
2
1 u
1 u
1 u
1 u
1.5
1.4 J
1 u
1 u
1U
1U
1 u
1 u
1 u
Xylene*. Total
10000
2 U
2 U
2 U
2 U
2 U
4 U
2 U
2 U
2 U
2 U
2 U
2U
2U
Semhrolatllei luofLI
420
0.18 U
0.2 U
0.19 U
0.19 U
0.2 U
0.2 U
0.19 U
0.19 U
0.19 U
0.19 U
0.19 U
0.19 U I 0.19 U
Anthracene
2100
0.19 U
0.2 U
0.19 U
0.19 U
0.2 U
02 U
0.19 U
0.19 U
0.19 U
0.19 U
0.19 U
0.19 U
0.19 U
Banztalanthrecene
0.24
0.19 U
0.2 U
019 U
019 U
0.2 U
0.2 U
0.19 U
0.19 U
0.19 U
0.19 U
0.19 U
0.19 U
0.19 U
Benzolatovmne
0.2
0.19 U
0.2 U
0.19 U
0.19 U
0.2 U
0.2 U
0.19 U
0.19 U
0.19 U
0.19 U
0.19 U
0.19 U
019 U
Benzotoffuorenlhene
0.24
0.19 U
0.2 U
0.19 U
0.19 U
0.2 U
0.2 U
0.19 U
019 U
0.19 U
0.19 U
0.19 U
019 U
0.19 U
2.4
0.19 U
0.2 U
0.19 U
0.19 U
0.2 U
0.2 U
0.19 U
0.19 U
0.19 U
0.19 U
0.19 U
0.19 U
0.19 U
Chrvmne
24
0.19 U
0.2 U
0.19 U
0.19 U
0.2 U
0.2 U
0.19 U
0.19 U
0.19 U
0.19 U
0.19 U
0.19 U
0.19 U
Dlbenzfa hlanthracene
0.024
0.1B U
0.2 U
0.19 U
0.19 U
0.2 U
02 U
0.19 U
0.19 U 1
0.19 U
0.19 U
0.19 U
0.19 U
019U
Di-n-butyl Dhthalale
700
4.9 U
5U
4.8 U
4.8 U
5U
4.9 U
4.B U
4.9 U
4.B U
4.B U
4.B U
4.BU
4.9U
Fluoianlhene
280
0.19 U
02 U
0.19 U
0.19 U
0.2 U
0.2 U
0.19 U
0.19 U
0.19 U
0.19 U
0.19 U
0.19 U
0.19 U
280
0.19 U
02 U
0.19 U
0.19 U
0.2 U
0.2 U
0.19 U
0.19 U
0.19 U
0.19 U
0.19 U
0.19 U
0.19 U
Indenoll » S-M)Bvrene
024
0.19 U
02 U
019 U
0.19 U
0.2 U
0.2 U
0.19 U
0.19 U
0.19 U
0.19 U
0.19 U
0.19 U
0.19 U
IMaohthalene
100
0.19 U
0.2 U
0.19 U
0.19 U
0.2 U
0.2 U
0.19 U
0.19 U
0.19 U
0.19 U
0.19 U
0.19 U
0.19 U
|Phenol
2000
0.97 U
1 u
0 .95 U
0.96 U
1 U
0.9BU
0 .95 U
0.97 U
0.95 U
0.95 U
0.95 U
0.96 U
097 U
IPvren*
210
0.19 U
0.2 U
0.19 U
0.19 U
02 U
0.2 U
0.19 U
0.19 U
0.19 U
0.19 U
0.19 U
0.19 U
0.19 U
PCBafof«.
Arodor-1242
05
0.41
0.095 U
0.096 U
1.9 U
0.11 U
0.096 U
0.096 U
0.097 U
0.096 U
0.096 U
0.097 U
0.096 U
0.096 U
Arodor-1248
0.5
0.096 U
0.46
0.45
86
0.11 U
0.096 U
0.096 U
0.097 U
0.096 U
0.096 U
0.097 U
0.096 U
0.096 U
Arador-1254
0.5
0.096 U
0.095 U
0.096 U
1.9 U
0.11 U
0.096 U
0.096 U
0.097 U
0.096 U
0.096 U
0.097 U
0.096 U
0.096 U
tMalali ("""
I I
Aluminum
7000
51
50 U
32 J
50 U
50 U
50 U
29 J
14 J
16 J
54
50 U
50 U
50 U
Arsenic
10
18
4.3 J
6.4
16
0.77 J
2,9 J
0.96 J
0.97 J
0.86 J
1.3 J
0.73 J
0.49 J
3.6 J
Barium
2000
330 B
95
140
140 B
200 B
180 B
230 B
230 B
230 B
400 B
2B0 B
240 B
130 B
3ervMum
4 ..
1 U
1 U
1 U
1 u
1 U
0.41 J
1 U
0 .44 J
1 u
1 U
1 U
1 u
1 U
Cadmium
5
1 U
1 U
1 U
1U
1 U
1 U
1 U
1 u
1 u
1 U
1 U
1 U
1 U
Chromium
100
2 U
2 U
2 U
2U
2 U
0.57 J
066 J
0.52 J B
0.46 J B
0.42 J
0.46 J B
2 U
2 U
Cobalt
140
0 .64 J
0.38 J
2.8
0.18 J
1 U
1.5
019 J
043 J
0.38 J
1.2
0.52 J
0.5B J
1 U
(Conner
1300
1.4 J B
0.64 J
3.9
0.44 J B
4 B
0.45 J B
0.88 J B
0.43 J B
2 U
0.72 J B
1 JB
2 U
2U
lw>
4900
8700 B
8000
5500
4100 B
1000 B
B50 B
1B00 B
1000 B
1100 B
490 B
5400 B
1200 B
3400 B
(Lead
15
Mi
1 u
OJ56.J
1 y
1 u
0.39 J
0.32 J
0.6 J B
0.42 J B
1.4
0.42 J B
0.27 J B I 0.22 J B
Page3oTB
-------
Table 4-1
Groundwater Sample Analytical Results - 1st Quarter 2017
Alcoa-Davenport Works
Sample ID1
SOW
Cone'
GM-04R-170316
GM-06R-170315
GM-09-170315
GM-10-170323
HNM70322
HS(S)-170322
HX-170322
JI-170321
JH70321-D
JS-170322
JX-170321
KD-170321
KI-170321
3/18/17
3/15/17
3/15/17
3/23/17
3/22/17
3/22/17
3/22/17
3/21/17
3/21/17
3/22/17
3/21/17
3/21/17
3/21/17
J.j
900
650 B
2900
2100
1800 B
22 B
66 B
14 B
27 B
27 B
560 B
18 B
48 B
4200 B
Mercury
2
0.2 U
0.2 U
0.2 U
0.2 U
0.2 U
0.2 U
0.2 U
0.2 U
0.2 U
0.2 U
0.2 U
0.2 U
02 U
Nickel
100
2.5
1.5 J
3.2
0.67 J B
3 B
3.9 B
3.7 B
0.65 J
0.81 J
1.1 JB
1.2 J
9.1
4.8
selenium
50
0.72 J
5 U
0.75 J
5U
5 U
1 J
5U
0.92 J
0.86 J
5 U
- 5 U _
5 li
.5 U
100
1 u
^ U 1
1 U
1 U
1 U
1 U
_ ^ 0
1U
1 U
_ _1 u
1 U
0.031 J
1 U
fnalium
0.5
1 U
1 U
1 U
1 U
1 U
iu
1 U
1 U
1 U
1 U
1 u
1 U
1 U
. enediim
7
0.77 J
5 U
1.3 J
0.78 J
5 U
5 U
_ 5 11
5 U
5 U
5 U
5 U
5 U
5 U
inc
2000
20 U
20 U
20 U
20 U
20 U
20 U
71
20 U
20 U
20 U
_ 39
45
20 U
WetChemMivMI.!
200
_JUL.
—JM—
—m—
.JUL,
10 U
10 u
Page4of8
-------
Table 4-1
Groundwater Sample Analytical Results - 1st Quarter 2017
Alcoa-Davenport Works
Sample ID1
SOW
Cone2
KI-170321-D
KS-170323
LBD-D1U-170316
LN1-170320
LS(S)-170320
NEA-011-170316
NEA-02M 70316
NI-170320
N5-170320
OID(175')-170322
OID(74')-170320
OS-170320
Semolina Date
3/21/17
3/23/17
3/16/17
3/20/17
3/20/17
3/16/17
3/16/17
3/20/17
3/20/17
3/22/17
3/20/17
3/20/17
Volatile* (ua/L)
1.1,1 -Trichloroethane
200
1 U
1 U
1 U
1 U
1 U
1 U
1 U
1 U
1 U
1 U
1 U
1 U
11 2,2-Tetrachloroethane
0.3
1 U
1 U
1 U
1 U
1 U
1 U
1 U
1 U
1 U
1 U
1 U
1 U
1,1 2-Trichloroethane
5
1 U
1 U
1 U
1 U
1 U
1 U
1 U
1 U
1 U
1 U
1 U
1 U
1,1-Dichloroethane
140
1 U
1 U
1 U
1 U
1 U
20
4
1 U
1 U
1 U
1 U
1 U
1,1-Dichloroethene
7
1 U
1 U
1 U
1 U
1 U
5.4
1
1 U
1 U
1 U
1 U
1 U
1,2-Dichlorobenzene
600
1 U
U
1 U
1 U
1 U
1 U
1 U
1 u
1 U
1 u
1 U
1 U
1,2-Dichloroethane
5
1 U
U
1 U
1 U
1 U
1 U
1 U
1 U
1 U
1 u
1 U
1 U
2-Butanone (MEK)
4000
10 U
10 U
10 U*
10 U
10 U*
10 U*
10 u*
10 u .
10 U
10 u
10 U
10 U
Acetone
6300
10 U
10 U
2.3 J
3 J
10 U
1.9 J
10 u
? 1 J
52 J
10 u
1.9 J
10 U
Acrolein
3.5
20 U
20 U
20 U
20 U
20 U
20 U
20 U
20 U
20 U
20 U
20 U
20 U
Benzene
5
1 U
U
1 U
1 U
1 U
1 U
1 U
1 U
1 U
1 U
1 U
1 U
Bromofbrm
60
1 U
U
1 U
1 U
1 U
1 U
1 U
1 U
1 U
1 U
1 U
1 U
Carbon disulfide
700
1 U
U
1 U
1 U
1 U
1 U
1 U
1 U
1 U
1 u
1 U
1 U
Carbon tetrachloride
5
1 U
U
1 U
1 U
1 U
1 U
1 U
1 U
1 U
1 u
1 U
1 U
Chlorobenzene
100
1 U
U
1 U
1 U
1 U
1 U
1 u
1 u
1 U
1 u
1 U
1 U
Chloroethane
60
1 U
1 U
1 U
1 U
1 U
1 U
1 u
1 u
1 U
1 u
1 U
1 U
Chloroform
60
1 U
U
1 U
1 U
1 U
1 U
1 u
1 u
1 U
1 u
1 U
1 U
Chloromethane
30
1 U
U
1 U
1 U
1 U
1 U
1 u
1 u
1 U
1 u
1 U
1 U
cis-1 2-Dichloroethene
70
1 U
U
1 U
6.6
1 U
1 U
1 u
1 u
1 U
0.3 J
0.64 J
1 U
Dtoromochloromelhane
60
1 U
U
1 U
1 U
1 U
1 U
1 u
1 u
1 U
1 U
1 U
1 U
Ethy benzene
700
1 U
U
1 U
1 U
1 U
1 U
1 u
1 u
1 U
1 U
1 U
1 U
Methyl isobutyl ketone
560
10 U
10 U
10 U
10 U
10 U
10 U*
10 u#
10 u
10 U
10 u
10 U
10 u
Methylene Chloride
5
1 U
U
1 U
1 U
1 u
1 U
1 u
1 u
1 U
1 u
1 U
1 u
letrachloroethene
5
1 u
u
1 U
1 U
1 u
1 U
1 u
1 u
1 U
1 u
1 U
1 u
Toluene
1000
1 u
u
1 U
1 U
1 u
1 U
1 u
1 u
1 U
1 u
1 U
1 u
irans-1 ,2-Dichloroethene
100
1 u
u
1 U
1 U
1 u
1 U
1 u
1 u
1 U
1 u
1 U
1 u
trans-1,3-DichloroDropene
1.6
1 u
u
1 U
1 U
1 u
1 U
1 u
1 u
1 U
1 u
1 U
1 u
Trichloroethene
5
1 u
1 u
1 U
1 U
1 u
1 U
1 u
1 u
1 u
1 u
1 U
1 u
Vinyl ch bride
2
1 u
u
1 u
1 U
1 u
1 U
1 u
1 u
1 u
1 u
1 U
1 u
Xylenes, Total
10000
2 U
2 U
2 U
2 U
2 U
2 U
2 U
2 U
2 U
2 U
2 U
2 U
Semlvolatiles (ua/L)
Acenaohthene
420
0.19 U
0.19 U
0.19 U
0.19 U
0.2 U
0.19 U
0.19 U
0.19 U
0.19 U
0.2 U
0.19 U
0.19 U
Anthracene
2100
0.19 U
0.19 U
0.19 U
0.19 U
0.2 U
0.19 U
0.19 U
0.19 U
0.19 U
0.2 U
0.19 U
0.19 U
Benzfalanthracene
0.24
0.19 U
0.19 U
0.19 U
0.19 U
0.2 U
0.19 U
0.19 U
019 U
0.19 U
0.2 U
0.19 U
0.19 U
Benzoralpyrene
0.2
0.19 U
0.19 U
0.19 U
0.19 U
0.2 U
0.19 U
0.19 U
019 U
0.19 U
0.2 U
0.19 U
0.19 U
Benzofblfluoranthene
0.24
0.19 U
0.19 U
0.19 U
0.19 U
0.2 U
0.19 U
0.19 U
0.19 U
0.19 U
0.2 U
0.19 U
0.19 U
Benzolkffluoranthene
2A
0.19 U
0.19 U
0.19 U
019 U
0.2 U
0.19 U
0.19 U
0.19 U
0.19 U
0.2 U
0.19 U
0.19 U
Chrynnne
24
0.19 U
0.19 U
0.19 U
0.19 U
0.2 U
0.19 U
0.19 U
0.19 U
0.19 U
0.2 U
0.19 U
0.19 U
Dbenz(a h)anthracene
0.024
0.19 U
0.19 U
0.19 U
0.1S U
0.2 U
0.19 U
0.19 U
0.19 U
0.19 U
0.2 U
0.19 U
0.19 U
Di-n-butyl phthalate
700
4.6 U
4.6 U
4.8 U
4.8 U
5 U
4.6 U
4.6 U
4.6 U
4.6 U
5.1 U
4.6 U
4.8 U
Fluoranthene
280
0.19 U
0.19 U
0.19 U
0.19 U
0.2 U
0.19 U
0.19 U
019 U
0.19 U
0.2 U
0.19 U
0.19 U
Fluorene
260
0.19 U
0.19 U
0.19 U
0.19 U
0.2 U
0.19 U
0.19 U
0.19 U
0.19 U
0.2 U
0.19 U
0.19 U
lndeno[1 2 3-cdlovrene
0.24
0.19 U
0.19 U
0.19 U
0.19 U
0.2 U
0.19 U
0.19 U
0.19 U
0.19 U
0.2 U
0.19 U
0.19 U
Naphthalene
100
0.19 U
0.19 U
0.19 U
0.19 U
0 2 U
0.19 U
0.19 U
0.19 U
0.19 U
0.2 U
0.19 U
0.19 U
Phenol
2000
0.95 U
0.95 U
0.95 U
0.95 U
0.99 U
0.96 U
0.95 U
0.95 U
0.96 U
1 U
0.96 U
0.96 U
Pyrene
210
0.19 U
0.19 U
0.19 U
0.19 U
0 2 U
0.19 U
0.19 U
0.19 U
0.19 U
0.2 U
0.19 U
0.19 U
PC Be (usA.)
Aroclor-1242
0.5
0.097 U
0.096 U
0.095 U
0.096 U
0.1 U
0.095 U
0.1 U
0.095 U
0.096 U
0.1 U
0.11 U
0.099 U
Aroclor-1246
0.5
0.097 U
0.096 U
0.095 U
0.096 U
01 U
0.095 U
0.1 U
0.095 U
0.096 U
0.1 U
0.11 U
0.099 U
Arodor-1254
0.5
0.097 U
0.096 U
0.095 U
0.096 U
0.1 U
0.095 U
0.1 U
0.095 U
0.096 U
0.1 U
0.11 U
0.099 U
Metala (ua/L)
Aluminum
7000
50 U
270
30 J
63
16 J
50 U
50 U
50 U
50 U
290
50 U
470
Arsenic
10
3.5 J
0.9 J
1.4 J
0.93 J
2.7 J
S U
0.66 J
0 76 J
13
1.2 J
1.6 J
0.64 J
Barium
2000
130 B
200 B
72 B
110 B
110 B
300 B
240 B
57 B
160 B
310 B
160 B
120 B
Beryllium
4
1 U
U
1 U
1 U
1 U
1 U
1 U
1 U
1 U
1 U
1 U
1 U
Cadmium
5
1 U
U
1 U
1 U
1 U
1 U
1 U
1 U
1 U
1 U
1 U
1 U
Chromium
100
2 U
0.66 J
0.41 J
0.32 J
2 U
2 U
2 U
2 U
0.43 J
0.9 J
0.34 J
1 J
Cobalt
140
0.13 J
0.23 J
0.14 J
1 U
1.2
1 U
1 U
0.3 J
0.64 J
0.43 J
0.54 J
0 75 J
Copper
1300
2 U
0.44 J B
2 B
2 U
2 U
0.46 J B
2 U
2 U
0.37 J B
0.47 J B
2 U
1.9 J B
Iron
4900
3600 B
1300 B
390 B
660 B
2600 B
3000 B
12000 B
7000 B
5100 B
5200 B
6900 B
570 B
Lead
15
0 25 J B
0.33 J
0.22 J
1 U
1 U
1 U
0.17 J
1 U
0.33 J
0.17 J
0.16 J
0.35J
Page 5 of B
-------
Table 4-1
Groundwater Sample Analytical Results - 1st Quarter 2017
Alcoa-Davenport Works
Sample ID1
SOW
Cone*
KM70321-D
KS-170323
LBD-01U-170316
LNJ-170320
LS(S)-170320
NEA-01M70316
NEA-02M 70316
N1-170320
NS-170320
OID(175>170322
OID(74>170320
OS-170320
S-mpUnaD-t*
3/21/17
3/23/17
3/16/17
3/20/17
3/20/17
3/16/17
3/16/17
3/20/17
3/20/17
3/22/17
3/20/17
3/20/17
Manaanete
300
4S00 B
4000 B
100 B
56
67
160 B
200 B
240
160
160 B
260
66
Mercury
2
0.2 U
0.2 U
02 U
0.2 U
0.2 U
0.2 U
0.2 U
0.2 U
0.2 U
0.2 U
0.2 UF1
0.2 U
Nickel
100
5.5
6.1 B
0 92 J
0.97 J
3.3
2.6
1.1 J
1.6 J
0.76 J
2.7 B
2.5
3.8
Selenium
50
5 U
5 U
1.7 J
5 U
5 U
5 U i 5 U
> L
1 J
5 U
0.69 J
0.64 J
Siver
100
1 U
1 U
1 U
1 U
1 U
1 U
1 u
I
1 U
1 U
1_U
1 U
Thalum
0.5
1 U
1 u
1 U
1 U
1 U
1 U
1 u
1 U
1 U
1 U
1 U
Vanadium
7
5 U
5 U
0.64 J
5 U
5 U I 5 U
5 U
5 U
0.59 J
5 U
5 U
14 J
Zinc
2000
20 U
20 U
20 U
20 U
20 U i 20 U 3 20 U
20 U
20 U
99
20 U
20 U
Htfet Chwniatrv iuatl)
I
taMtffaTMai
200
10 U
10 U
10 U
10 U
10 U
10 U I 10 U
10 U
10 U
10 U
10 U
10 U
Pag*6 of8
-------
Table 4-1
Groundwater Sample Analytical Results - 1st Quarter 2017
Alcoa-Davenport Works
Sampla ID1
sow
Cone'
PA-14S-170323
PA-17S-170322
WA-011-170322
WDS-2-170314
WDS-3-170314
WDS-5-170315
SamMlne Data
3/23/17 b
3/22/17
3/22/17
3/14/17
3/14/17
3/15/17
talatllM (ugfLI
111-Trictitoroethane
200
1 U
14 U
1 U
1 u
1 U
1 1 U
[1J 2 2-Tetrachbioelh ine
0J
iu
14 U
1 U
1 U
1 u
1 U
1 1 2-Trichk>roethane
5
VI)
14 U
1 U
1 u
1 u
I "i u
|11-Dichbroathane
140
041 J
10 J
1 U
1 U
1 U
| 1 u
11-Dichloroethene
7
1 U
14 U
1 U
1 u
1 u
! TTj
12-Dtchtorobenzene
600
1 U
14 U
1 U
1 u
1 u
[ 1 u
12-DicMoroelhane
5
1 U
14 U
1 U
1 u
1 u
I i~u
2-Butanone (MEK)
4000
10 u
140 U
10 U
10 u
10 u
|. 10 u.
Acetone
MO0
10 u
140 U
10 U
10 u
ib u
__
Protein
3.5
20 U
290 U
20 U
20 U
20 U
t 20 U
Benzene
5
1 U
14 U
1 U
1U
1 U
! 1 U
BromofOi it i
80
1 U
14 U
1 U
1U
1 u
1 U
Carbon disulfide
700
1U
14 U
1 U
" 1 U - -
1 u
1 1 u
Carbon tetrachloride
5
1 u
14 U
1 U
1 u
1 u
! 1 U
hlorobenzene _
100
1 u
14 U
1 U
- 1 L
1 U
1 1 u
Chloroalhana
60
1 u
14 U
1 U
1 I
*
1 u*
I 1 u
80
1 u
14 U
1 U
1 u
1 u
I 1 u
Chtoromethane
30
1 u
14 U ~1
1 U
1 u
1 u
i 1 u
e»«-1 2-Dichloroethene
70
72
1400
1 U
1 u
1.9
.. 15
Dbromochloromethane
80
1 u
14 U
1 U
1 u
1 u
1 U
Ethyfaenzene
700
1 u
14 U
1 U
1U
1 U
1_.u
Atethvl isobuM ketone
560
10 u
140 U
10 u
10 u
10 u
10 u*
M*thvlene Chloride
5
1 u
14 U
1 u
- 1 U
1 u
1 u
Tetraehloroethene
5
11
4200
1U
- - 1 U
2
1 u
Toluene
1000
1 u
14 U
1 u
1 u
1 u
1 u
trans-12-Dichloroethene
100
1 u
9.5 J
1 u
1U
1 u ^
1 u
irans-1 3-DichloroDroDene
1.8
1 U
14 U
1 u
1 U
1 u
1 u
¦ — ~ —
i ncmoroemene
5
17
710
1 u
1U
0.7 J
1 u
Vlnvl chloride
2
1 U
14 U
1 u
1 u
1 u
1 u
*v»nes Total
10000
2 U
29 U
2U
2 U
2U
2 U
Smhrofartiles luoflJ
Aeenaohthene
420
0.19 U
0.19 U
0.19 U
0.19 U
0.19 U
0.19 U
Anthracene
2100
0.19 U
0.19 U
0.19 U
0.19 U
0.12 J
0.19 U
sBenzlalanttiracene
0.24
0.19 U
0.19 U
0.19 U
0.19 U
0.19 U
0.19 U
BenzoTekvrene
0.2
0.19 U
0.19 U
0.19 U
0.19 U
0.19 U
0.19 U
BenzoCbWuoranthene
024
0.19 U
0.19 U
0.19 U
0.19 U
0.19 U
0.19 U
Benzofhlfluoranthene
2.4
0.19 U
0.19 U
0.19 U
0.19 U
0.19 U
0.19 U
iChrvMne
24
0.19 U
0.19 U
0.19 U
0.19 U
0.19 U
0.19 U
Dibenzfa h)anthracene
0.024
0.19 U
0.19 U
0.19 U
0.19 U
0.19 U
0.19 U
Di-n-buM ohthaMe ~~1
700
4 .8 U
4.8 U
4.9 U
4.9 U I 4.9 U
4.8 U
Fluoranthene
280
0.19 U
0.19 U
0.19 U
0.19 U
0.19 U
0.19 U
Fluorene
280
0.19 U
0.19 U
0.19 U
0.19 U
0.19 U
019 U
Menori 2 3-cdbwmne
0.24
0.19 U
0.19 U
0 19 U
019 U
0.19 U
0.19 U
Naphthalene
100
0.19 U
0.19 U
0.19 U
0.19 U
0.19 U
0.19 U
DhMAi
2000
0.96 U
0.95 U
0.97 U
0.97 U
0.97 U
0.95 U
210
0.19 U
0.19 U
0.19 U
0.19 U
0.19 U
0.19 U
PCBamWU. .. . .
I I
Aroelnr-1242
0,5
0,096 U
0.096 U
0.096 U
0.095 U
0.097 U
0.095 U
ftrorJor-1248
0.5
0.096 U
0.096 U
0.096 U
0.095 U
0 097 U
0.095 U
Arodor-1254
0.5
0.096 U
0.096 U
_
0.096 U
0.095 U
0.097 U
0.095 U
Metala (ugiu
I I
Muminum
7000
sou
50 U
210
50 U
23 J
180
10
1.5 J
1.5 J
0.95 J
i 0 .42 J
0.55 J
1.8 J
Barium
2000
180 B
230 B
160 B
I B5
190
330
4
1 U
1 U
1 U
1 U
1 U
1 U
Cadmium
5
1 U
1 u
1 U
1 U
1 U
1 U
Chromium
100
0,33 J
0.28 J
0.62 J
2 U
2 U
0.4 J
Cobalt
140
1.7
I 13 L
0.18 J
1 U
0.78 J
16
Connir
1300
0,92 J B
2 U
0.57 J B
1.5 J
0.84 J
1.1 J
Iron
4900
1200 B
740 B
2400 B
8.8 J
61 J
2700
Lead
15
0.17 J
1 U
0.32 J
1 U
MLL._
0.38 J
Page 7 of8
-------
Table 4-1
Groundwater Sample Analytical Results - 1st Quarter 2017
Alcoa-Davenport Works
Bampta ID1
SOW
PA-14S-170323
PA-17S-170322
WA-011-170322
WDS-2-170314
WDS-3-170314
WDS-5-170315
3/23/17
3/22/17
3/22/17
3/14/17
3/14/17
3/15/17
J'"
300
450 B
160 B
58 B
21
3500
7900 :
Mercuiv
2
0.2 U
02 U
02 U
02 U
02 U
02 U
Nickel
100
5.8 B
5.7 B
0.77 J B
0.96 J _
7.9
.19 __
|s»lenlum
SO
0.57 J
5U
5U „
11 J _
0.67 J
5 U
Silver
100
1 U
1 U
1 U
1 u
1 U
1 U
Thallium
0.5
1 U
1 U
1 u
— Tu
1 U
1 U
vanadium
7
5 U
5 U
0.54 J
0.54 J
5 U
0.62 J
"he
2000
92 J
20 U
76
20 U
20 U
20 U
tVel ChemhUv (up/L)
Page 8 of8
-------
Table 4-2
Groundwater Sample Analytical Results - 2nd Quarter 2017
Alcoa-Davenport Works
Sample ID1
SOW
Cone1
AD-170613
AM70613
ANS-170613
AS-170613
AX-170613
ED-170615
EDS-2-170613
EM 70615
ES-170615
Semolina Date
6/13/17
6/13/17
6/13/17
6/13/17
6/13/17
6/15/17
6/13/17
6/15/17
6/15/17
Volatlles (ug/L)
1,1,1-Trichloroethane
200
1 U
1 U
1 U
1 U
1 U
1 U
1 U
5 U
1 U
1,1,2,2-Tetrachloroethaiie
0.3
1 U
1 U
1 U
1 U
1 U
1 U
1 U
5 U
1 U
1,1,2-Trichloroethane
5
1 U
1 U
1 U
1 U
1 U
1 U
1 U
5 U
1 U
1,1-Dichloroethane
140
1 U
1 U
0.34 J
0.66 J
1 U
1 U
1 U
5 U
1 U
1,1-Dichloroethene
7
1 U
1 U
1 U
1 U
1 U
1 U
1 U
5 U
1 U
1,2-Dichlorobenzene
600
1 U
1 U
1 U
1 U
1 U
1 U
1 U
5 U
1 U
1,2-Dichloroethane
5
1 U
1 U
1 U
1 U
1 U
1 U
1 U
5 U
1 U
2-Butanone (MEK)
4000
10 U
10 U
10 U
10 U
10 U
10 U
10 U
50 U
10 U
Acetone
6300
10 U
10 U
11
10 U
10 U
3.8 J
3.2 J
50 U
4.6 J
Acrolein
3.5
20 U
20 U
20 U
20 U
20 U
20 U
20 U
100 U
20 U
Benzene
5
1 U
1 U
0.6 J
1 U
1 U
1 U
1 U
S80
1 U
Bromoform
80
1 U
1 U
1 U
1 U
1 U
1 U
1 U
5 U
1 U
Carbon disulfide
700
1 U
1.2
1 U
4.2
1 U
1 U
0.34 J
5 U
1 U
Carbon tetrachloride
5
1 U
1 U
1 U
1 U
1 U
1 U
1 U
5 U
1 U
Chlorobenzene
100
1 U
1 U
1 U
1 U
1 U
1 U
1 U
5 U
0.39 J
Chloroethane
60
1 u
1 U
0.82 J
1 U
1 U
1 U
1 U
5 U
1 U
Chloroform
80
1 u
1 U
1 U
1 U
1 U
1 U
1 U
5 U
1 U
Chloromethane
30
1 u
1 U
1 U
1 U
1 U
1 U
1 U
5 U
1 U
cis-1,2-Dichloroethene
70
1 u
1 U
5.6
24
1 U
1 U
1.2
5 U
1 U
~ibromochloromethane
80
1 u
1 U
1 U
1 U
1 u
1 U
1 U
5 U
1 U
Ethvlbenzene
700
1 u
1 U
1 U
1 U
1 u
1 U
1 U
5.7
1 U
Methyl isobutyl ketone
560
10 u
10 U
10 U
10 u
10 u
10 U
10 U
50 U
10 U
Methylene Chloride
5
1 u
1 U
1 U
1 u
1 u
1 U
1 U
5 U
1 U
Tetrachloroethene
5
1 u
1 U
1 U
1 u
1 u
1 U
1 U
5 U
1 U
Toluene
1000
1 u
1 U
1 U
1 u
1 u
1 U
1 U
20
1 U
lrans-1,2-Dichloroethene
100
1 u
1 u
1 U
1 u
1 u
1 U
1 U
5 U
1 U
trans-1,3-Dichloropropene
1.8
1 u
1 u
1 U
1 u
1 u
1 U
1 U
5 U
1 U
Trichloroethene
5
1 u
1 u
1 U
1 u
1 u
1 u
1 U
5 U
1 U
Vinyl chloride
2
1 u
1 u
1.4
11
1 u
1 u
2.8
5 U
1 U
Xylenes, Total
10000
2 U
2 U
2 U
2 U
2 U
2 U
2 U
35
2 U
Semivolatlles (ug/L)
Acenaphthene
420
0.19 U
0.19 U
1 U
0.19 U
0.19 U
0.19 U
0.19 U
1.1
0.19 U
Anthracene
2100
0.19 U
0.19 U
1 U
0.19 U
0.19 U
0.19 U
0.19 U
0.19 U
0.19 U
Benz[alanthracene
0.24
0.19 U
0.19 U
1 U
0.19 U
0.19 U
0.19 U
0.19 U
0.19 U
0.19 U
Benzo[a]pyrene
0.2
0.19 U
0.19 U
1 U
0.19 U
0.19 U
0.19 U
0.19 U
0.19 U
0.19 U
Benzofblfluoranthene
0.24
0.19 U
0.19 U
1 U
0.19 U
0.19 U
0.19 U
0.19 U
0.19 U
0.19 U
Benzolklfluoranthene
2.4
0.19 U
0.19 U
1 U
0.19 U
0.19 U
0.19 U
0.19 U
0.19 U
0.19 U
Chrysene
24
0.19 U
0.19 U
1 U
0.19 U
0.19 U
0.19 U
0.19 U
0.19 U
0.19 U
Dibenz(a,h)anthracene
0.024
0.19 U
0.19 U
1 U
0.19 U
0.19 U
0.19 U
0.19 U
0.19 U
0.19 U
~i-n-butyl phthalate
700
4.9 U
4.8 U
25 U
4.8 U
4.8 U
4.8 U
4.8 U
4.8 U
4.8 U
Fluoranthene
280
0.19 U
0.19 U
1 U
0.19 U
0.19 U
0.19 U
0.19 U
0.19 U
0.19 U
Fluorene
280
0.19 U
0.19 U
0.74 J
0.19 U
0.19 U
0.19 U
0.19 U
0.93
0.19 U
Page 1 of 10
-------
Table 4-2
Groundwater Sample Analytical Results - 2nd Quarter 2017
Alcoa-Davenport Works
Sample ID1
SOW
Cone1
AD-170613
AM70613
ANS-170613
AS-170613
AX-170613
ED-170615
EDS-2-170613
EI-170615
ES-170615
Samollna Date
6/13/17
6/13/17
6/13/17
6/13/17
6/13/17
6/15/17
6/13/17
6/15/17
6/15/17
IndenoM ,2,3-cdlpyrene
0.24
0.19 U
0.19 U
1 U
0.19 U
0.19 U
0.19 U
0.19 U
0.19 U
0.19 U
Naphthalene
100
0.19 U
0.19 U
1 U
0.19 U
0.19 U
0.19 U
0.19 U
0.51
0.19 U
Phenol
2000
0.97 U
0.95 U
5 U
0.95 U
0.95 U
0.96 U
0.96 U
1-4
0.95 U
Pyrene
210
0.19 U
0.19 U
1 U
0.19 U
0.19 U
0.19 U
0.19 U
0.19 U
0.19 U
PCBs (ug/L)
Arodor-1242
0.5
0.096 U
0.16 p
0.97 U
0.096 U
0.096 U
0.097 U
0.096 U
0.096 U
0.096 U
Arodor-1248
0.5
0.096 U
0.096 U
15
0.86
0.096 U
0.097 U
0.096 U
0.096 U
0.096 U
Arodor-1254
0.5
0.096 U
0.096 U
0.97 U
0.096 U
0.096 U
0.097 U
0.096 U
0.096 U
0.096 U
Metals (ug/L)
Aluminum
7000
64 B
100 B
67 B
50 U
42 J B
50 U
160 B
50 U
50 U
Arsenic
10
1.6 J
0.85 J
11
3.6 J
5 U
5 U
3.8 J
5 U
5 U
Barium
2000
230
270
1700
160
110
270
160
200
130
Beryllium
4
1 U
1 U
1 U
1 U
1 U
1 UA
1 U
1 U*
1 U*
Cadmium
5
1 U
1 U
1 U
1 U
0/49 J
1 U
1 U
1 U
1 U
Chromium
100
7A
1.5 J
1.1 J
1.2 J
1.1 J
2 U
2 U
2 U
2 U
Cobalt
140
1.8
0.24 J
0.43 J
2
0.69 J
0.25 J
5.1
0.2 J
2
Cooper
1300
30 B
2 U
3.5 B
2 U
2 U
4.6 B
2 U
2 U
2 U
Iron
4900
28000
4000
9500
3600
2700
10000
350
1700
810
Lead
15
0.5 J
1 U
1 U
1-4
1 U
1 u
1 U
1 U
1 U
Manganese
300
13
220
1000
1400
55
12
2900
22
190
Mercury
2
0.2 U
0.2 U
o a. u
0.2 U
0.2 U
0.2 U
0.2 U
0.2 U
0.2 U
Nickel
100
21
1.8 J
3.2
3.1
2 U
2 U
11
2 U
3.8
Selenium
50
5 U
5 U
5 U
5 U
5 U
5 U
5 U
5 U
5 U
Silver
100
1 U
1 U
1 u
1 U
1 U
1 U
1 U
1 U
1 U
Thallium
0.5
1 U
1 U
1 u
1 U
1 U
1 U
1 U
1 U
1 U
Vanadium
7
5 U
5 U
5 U
5 U
5 U
5 U
1.8 J
5 U
5 U
Zinc
2000
85
20 U
20 U
20 U
65
140
20 U
20 U
20 U
Wet Chemistry (ug/L)
Cvanide Total
200
36 J
10 U
2£J_
10 U
2.3 J
10 U
2.7 J
10 U
10 U
''Filtered samples have an "F" at the end of the sample ID; dupKcate samples have a "D" at the end of the sample ID
^Performance Standard for oiganics; Monitoring Level for inorganics. Bold indicates the parameter was detected above the SOW Cone
Data Quajfiers (refer to Appendix D for results of data vaidation)
*: LCS or LCSD is outside acceptance limits
B: Compound was found in the blank and sample.
J: Result is less than the RL but greater than or equal to the MDL and the concentration is an approximate value.
U : Indicates the analyte was analyzed for but not detected.
A: Instrument-related QC is outside acceptance imits
p : % RPD between primary and confirmation columiVdetector is >40%. Lower value has been reported.
Page 2 of 10
-------
Table 4-2
Groundwater Sample Analytical Results - 2nd Quarter 2017
Alcoa-Davenport Works
Sample ID1
SOW
Cone1
FD-170614
FD-170614-F
FM70614
FS-170621
FS-170621-F
GM-04R-170616
GM-06R-170621
GM-09-170614
GM-10-170621
Semolina Date
6/14/17
6/14/17
6/14/17
6/21/17
6/21/17
6/16/17
6/21/17
6/14/17
6/22/17
Volatlles (ug/L)
1,1,1-Trichloraethane
200
1 U
-
1 U
1 U
-
1 U
1 U
1 U
1 U*
1,1,2,2-Tetrachloroethane
0.3
1 U
—
1 U
1 U
—
1 U
1 U
1 U
1 U
1,1,2-Trichloroethane
5
1 U
-
1 U
1 U
-
1 U
1 U
1 U
1 U
1,1-Dichloroethane
140
1 U
—
2.7
1 U
—
1 U
1 U
0.49 J
1 U
1,1-Dichloroetherie
7
1 U
-
0.97 J
1 U
-
1 U
1 U
1 U
1 U
1,2-Dichlorobenzene
600
1 U
—
1 U
1 U
—
1 U
1 U
1 U
1 U
1,2-Dichloroethane
5
1 U
-
1 U
1 U
-
1 U
1 U
1 U
1 U
2-Butanone (MEK)
4000
10 U
—
10 U
10 U
—
1.4 J
10 U
10 U
10 U
Acetone
6300
10 U
-
4.9 J
3.6 J
-
7.8 J
4 J
5.3 J
6.3 J
Acrolein
3.5
20 U
—
20 U
20 U
—
20 U
20 U
20 U
20 U
Benzene
5
1 U
-
1 U
1 U
-
1 U
1 U
1 U
1 U
Bromoforni
80
1 U
-
1 U
1 U
-
1 U
1 U
1 U
1 U
Carbon disulfide
700
1 U
-
1 U
1 U
-
1 U
1 U
1 U
1 U
Carbon tetrachloride
5
1 U
—
1 U
1 U
—
1 U
1 U
1 U
1 U
Chlorobenzene
100
1 U
-
1 U
1 U
-
1 U
1 U
1 U
1 U
Chloroethane
60
1 U
-
1 U
1 U
-
1 U
1 U
3.4
9.2
Chloroform
80
1 U
-
1 U
1 U
-
1 U
1 U
1 U
1 U
Chloromethane
30
1 U
—
1 U
1 U
—
1 U
1 U
1 U
1 U
ds-1,2-Dichloroethene
70
1 U
-
1 U
1 U
-
1 U
1
2.1
0.48 J
Dibromochloromethane
80
1 U
-
1 U
1 U
-
1 U
1 U
1 U
1 U
Ethylbenzene
700
1 U
—
1 U
1 U
—
1 U
1 U
1 U
1 U
Methyl isobutyl ketone
560
10 U
-
10 U
10 U
-
10 U
10 U
10 U
10 U
Methylene Chloride
5
1 U
—
1 U
1 U
—
1 U
1 U
1 U
1 U
Tetrachloroethene
5
1 U
—
1 U
1 U
—
1 U
1 U
1 U
0.37 J
Toluene
1000
1 U
—
1 U
1 U
—
1 U
1 U
1 U
0.24 J
lrans-1,2-Dichloroethene
100
1 u
—
1 U
1 U
—
1 U
1 U
1 U
1 U
trans-1,3-Dichloropropene
1.8
1 u
—
1 U
1 u
—
1 U
1 U
1 U
1 U
Trichloroethene
5
1 u
-
1 U
1 u
-
1 U
1 u
1 U
0.45 J
Vinvl chloride
2
1 u
—
1 u
1 u
—
1 U
1 u
0.97 J
1 U
Xylenes, Total
10000
2 U
—
2 U
2 U
—
2 U
2 U
2 U
2 U
Semlvo la tiles (ug/L)
¦Acenaphthene
420
0.19 U
0.2 U
0.19 U
0.19 U
0.19 U
0.21 U
0.19 U
0.19 U
0.21 U
[Anthracene
2100
0.19 U
0.2 U
0.19 U
0.19 U
0.19 U
0.21 U
0.19 U
0.19 U
0.21 U
Benz[a]anthracene
0.24
0.19 U
0.2 U
0.19 U
0.19 U
0.19 U
0.21 U
0.19 U
0.19 U
0.21 U
Benzola]pyrene
0.2
0.19 U
0.2 U
0.19 U
0.19 U
0.19 U
0.21 U
0.19 U
0.19 U
0.21 U
Benzo[blfluoranthene
0.24
0.19 U
0.2 U
0.19 U
0.19 U
0.19 U
0.21 U
0.19 U
0.19 U
0.21 U
Benzolklfluoranthene
2.4
0.19 U
0.2 U
0.19 U
0.19 U
0.19 U
0.21 U
0.19 U
0.19 U
0.21 U
Chrysene
24
0.19 U
0.2 U
0.19 U
0.19 U
0.19 U
0.21 U
0.19 U
0.19 U
0.21 U
Dibenzfa, h)anthracene
0.024
0.19 U
0.2 U
0.19 U
0.19 U
0.19 U
0.21 U
0.19 U
0.19 U
0.21 U
Di-n-butyl phthalate
700
4.8 U
4.9 U
4.8 U
4.8 U
4.8 U
5.3 U
4.8 U
4.8 U
5.2 U
Ruoranthene
280
0.19 U
0.2 U
0.19 U
0.19 U
0.19 U
0.21 U
0.19 U
0.19 U
0.21 U
Fluorene
280
0.19 U
0.2 U
0.19 U
0.19 U
0.19 U
0.26
0.19 U
0.19 U
0.21 U
Page 3 of 10
-------
Table 4-2
Groundwater Sample Analytical Results - 2nd Quarter 2017
Alcoa-Davenport Works
Sample ID1
SOW
Cone1
FD-170614
FD-170614-F
FM70614
FS-170621
FS-170621-F
GM-04R-170616
GM-06R-170621
GM-09-170614
GM-10-170621
Semolina Date
6/14/17
6/14/17
6/14/17
6/21/17
6/21/17
6/16/17
6/21/17
6/14/17
6/22/17
hdenoM ,2,3-cdlovrene
0.24
0.19 U
0.2 U
0.19 U
0.19 U
0.19 U
0.21 U
0.19 U
0.19 U
0.21 U
Naphthalene
100
0.19 U
0.2 U
0.19 U
0.19 U
0.19 U
0.21 U
0.19 U
0.19 U
0.21 U
Phenol
2000
0.96 U
0.98 U
0.95 U
0.96 U
0.95 U
1.1 U
0.95 U
0.96 U
1 U
Pyrene
210
0.19 U
0.2 U
0.19 U
0.19 U
0.19 U
0.21 U
0.19 U
0.19 U
0.21 U
PCBs fun/L)
Arodor-1242
0.5
0.096 U
0.097 U
0.096 U
0.096 U
0.096 U
0.65
0.099 U
0.095 U
0.49 U
Arodor-1248
0.5
0.096 U
0.097 U
0.096 U
0.067 J
0.096 U
0.096 U
0.66
0.77
4.7
Arodor-1254
0.5
0.096 U
0.097 U
0.096 U
0.096 U
0.096 U
0.096 U
0.099 U
0.095 U
0.49 U
Metals (ua/L)
Aluminum
7000
44 J
50 U
50 U
50 U
50 U
50 U
50 U
36 J
50 U
Arsenic
10
5 U
5 U
0.8 J
9.4
1.3 J
27
5.1
24
15
Barium
2000
310
300
300
270
240
600
100
310
140
Beryllium
4
1 U
1 U
1 U
1 U
1 U
1 U*
1 U
1 U
1 U
Cadmium
5
1 U
1 U
1 U
1 U
1 U
1 U
1 U
1 U
1 U
Chromium
100
2 U
2 U
2 U
2 U
2 U
2.2
2 U
2 U
2 U
Cobalt
140
1 U
1 U
0.19 J
1.5
1.3
0.84 J
1.1
0.28 J
1 U
Copper
1300
2 U
2 U
2 U
2 U
2 U
1.7 J B
2.8 B
2 U
2 U
Iron
4900
17000
12000
16000
10000
1200
15000
3000
9900
3900
Lead
15
1 u
1 u
1 u
1 u
1 U
1 u
1 U
1 U
1 U
Manganese
300
160
140
320
280
270
1700
1600
2400
1600
Mercury
2
0.2 U
0.2 U
0.2 U
0.2 U
0.2 U
0.2 U
0.2 U
0.2 U
0.2 U
Nickel
100
2 U
2 U
2 U
6.7
5.9
4.6
3.7
2 U
2 U
Selenium
50
5 U
5 U
5 U
5 U
5 U
5 U
5 U
5 U
5 U
Silver
100
1 U
1 U
1 U
1 U
1 U
1 U
1 U
1 U
1 U
Thallium
0.5
1 U
1 U
0.39 J
1 U
1 U
1 U
1 U
1 U
1 U
Vanadium
7
5 U
5 U
5 U
5 U
5 U
5 U
5 U
1.1 J
5 U
Zinc
2000
110
28
20 U
20 U
20 U
20 U
20 U
20 U
20 U
wet Chemistry (ua/L)
Cvanide. Total
200
10 U
2.2 J
10 U
10 U
10 U
10 U
10 U
3 J
10 U
Page 4 of 10
-------
Table 4-2
Groundwater Sample Analytical Results - 2nd Quarter 2017
Alcoa-Davenport Works
Sample ID1
SOW
HNI-170620
HS(S)-170620
HX-170620
JI-170620
JI-170620-D
JS-170621
JX-170620
KD-170621
KI-170621
KI-170621-D
KS-170621
Semolina Date
6/20/17
6/20/17
6/20/17
6/20/17
6/20/17
6/21/17
6/20/17
6/21/17
6/21/17
6/21/17
6/21/17
Volatlles (ug/L)
1,1,1-T richloroethane
200
1 U
2.5 U
1 U
1 U
1 U
1 U
1 U
1 U
1 U
1 U
1 U
1,1,2,2-Tetrachloroethane
0.3
1 u
2.5 U
1 U
1 u
1 U
1 u
1 u
1 u
1 u
1 U
1 u
1,1,2-Trichloraethane
5
1 u
2.5 U
1 U
1 u
1 U
1 u
1 u
1 u
1 u
1 U
1 u
1,1-Dichloroethane
140
1 u
6.5
1 u
1 u
1 U
1 u
1 u
1 u
1 u
1 U
1 u
1,1-Dichloroethene
7
1 u
2.8
1 u
1 u
1 u
1 u
1 u
1 u
1 u
1 U
1 u
1,2-Dichlorobenzene
600
1 u
2.5 U
1 u
1 u
1 u
1 u
1 u
1 u
0.31 J
1 U
1 u
1,2-Dichloroethane
5
1 u
2.5 U
1 u
1 u
1 u
1 u
1 u
1 u
1 U
1 u
1 u
2-Butanone (MEK)
4000
10 u
25 U
10 u
10 u
10 u
10 u
10 u
10 u
10 U
10 u
10 u
Acetone
6300
2.8 J
6 J
3 J
10 u
7.3 J
3.6 J
10 u
4.2 J
2.8 J
3.8 J
4.5 J
Acrolein
3.5
20 U
50 U
20 U
20 U
20 U
20 U
20 U
20 U
20 U
20 U
20 U
Benzene
5
1 U
2.5 U
1 U
1.6
1.7
1 U
2.5
1 U
1 U
1 U
1 U
Bromoform
80
1 U
2.5 U
1 U
1 U
1 U
1 U
1 U
1 U
1 U
1 U
1 U
Carbon disulfide
700
1 U
2.5 U
1 U
1 U
1 U
1 U
1 U
1 U
1 U
1 U
1 U
Caibon tetrachloride
5
1 U
2.5 U
1 U
1 U
1 U
1 U
1 U
1 U
1 U
1 U
1 U
Chlorobenzene
100
1 U
2.5 U
1 U
1 U
1 U
1 U
1 U
1 U
1 U
1 U
1 U
Chloroethane
60
1 U
2.5 U
1 U
1 U
1 U
1 U
1 U
1 U
1 U
1 U
1 U
Chloroform
80
1 U
2.5 U
1 U
1 u
1 U
1 U
1 U
1 U
1 U
1 U
1 U
Chloromethane
30
1 U
2.5 U
1 U
1 u
1 U
1 U
1 U
1 U
1 U
1 U
1 U
cis-1,2-Dichloroethene
70
5.6
430
1.3
1.1
1.2
1 U
0.3 J
1 U
1 U
1 U
1 U
~ibromochloromethane
80
1 U
2.5 U
1 U
1 u
1 U
1 U
1 U
1 U
1 U
1 U
1 U
Ethylbenzene
700
1 U
2.5 U
1 U
1 u
1 U
1 U
1 U
1 U
1 U
1 U
1 U
Methyl isobutyl ketone
560
10 U
25 U
10 u
10 u
10 U
10 u
10 U
10 u
10 U
10 U
10 u
Methylene Chloride
5
1 U
2.5 U
1 u
1 u
1 U
1 u
1 U
1 u
1 U
1 u
1 u
Tetrachloroethene
5
1 U
630
1 u
1 u
1 U
1 u
1 U
1 u
1 u
1 u
1 u
Toluene
1000
1 U
2.5 U
1 u
1 u
1 U
1 u
1 U
1 u
1 u
1 u
1 u
trans-1,2-Dichloroethene
100
1 U
4.7
1 u
1 u
1 U
1 u
1 u
1 u
1 u
1 u
1 u
trans-1,3-Dichloropropene
1.8
1 U
2.5 U
1 u
1 u
1 U
1 u
1 u
1 u
1 u
1 u
1 u
Trichloroethene
5
1 U
380
1 u
1 u
1 U
1 u
1 u
1 u
1 u
1 u
1 u
Vinvl chloride
2
1.3
3.8
1 u
1.7
1.7
1 u
1 u
1 u
1 u
1 u
1 u
Xylenes, Total
10000
2 U
5 U
2 U
2 U
2 U
2 U
2 U
2 U
2 U
2 U
2 U
Semlvolatlles (ug/L)
lAcenaphthene
420
0.10 U
0.19 U
0.19 U
0.19 U
0.19 U
0.19 U
0.19 U
0.19 U
0.19 U
0.19 U
0.19 U
Anthracene
2100
0.19 U
0.19 U
0.19 U
0.19 U
0.19 U
0.19 U
0.19 U
0.19 U
0.19 U
0.19 U
0.19 U
Benz[a]anthracene
0.24
0.19 U
0.19 U
0.19 U
0.19 U
0.19 U
0.19 U
0.19 U
0.19 U
0.19 U
0.19 U
0.19 U
Benzo[a]pyrene
0.2
0.19 U
0.19 U
0.19 U
0.19 U
0.19 U
0.19 U
0.19 U
0.19 U
0.19 U
0.19 U
0.19 U
Benzofblfluoranthene
0.24
0.19 U
0.19 U
0.19 U
0.19 U
0.19 U
0.19 U
0.19 U
0.19 U
0.19 U
0.19 U
0.19 U
Benzolklfluoranthene
2A
0.19 U
0.19 U
0.19 U
0.19 U
0.19 U
0.19 U
0.19 U
0.19 U
0.19 II
0.19 U
0.19 II
Chrysene
24
0.19 U
0.19 U
0.19 U
0.19 U
0.19 U
0.19 U
0.19 U
0.19 U
0.19 U
0.19 U
0.19 U
Dibenzta ,h)anthracene
0.024
0.19 U
0.19 U
0.19 U
0.19 U
0.19 U
0.19 II
0.19 II
0.19 II
0.19 II
0.19 U
0.19 U
~i-n-butyl phthalate
700
4.8 U
4.8 U
4.8 U
4.8 U
4.8 U
4.8 U
4.8 U
4.8 U
4.8 U
4.8 U
4.8 U
Fluoranthene
280
0.19 U
0.19 U
0.19 U
0.19 U
0.19 U
0.19 U
0.19 U
0.19 U
0.19 U
0.19 U
0.19 II
Fiuorene
280
0.19 U
0.19 U
0.19 U
0.19 U
0.19 U
0.19 U
0.19 U
0.19 U
0.19 U
0.19 U
0.19 U
Page 5 of 10
-------
Table 4-2
Groundwater Sample Analytical Results - 2nd Quarter 2017
Alcoa-Davenport Works
Sample ID1
SOW
HNI-170620
HS(S)-170620
HX-170620
JI-170620
JI-170620-D
JS-170621
JX-170620
KD-170621
KI-170621
KI-170621-D
KS-170621
Samollna Date
Cone
6/20/17
6/20/17
6/20/17
6/20/17
6/20/17
6/21/17
6/20/17
6/21/17
6/21/17
6/21/17
6/21/17
IndenoM ,2.3-cdlDvrene
0.24
0.19 U
0.19 U
0.19 U
0.19 U
0.19 U
0.19 U
0.19 U
0.19 U
0.19 U
0.19 II
0.19 U
Naphthalene
100
0.19 II
0.19 U
0.19 U
0.19 U
0.19 II
0.19 U
0.19 U
0.19 U
0.19 U
0.19 U
0.19 U
Phenol
2000
0.95 U
0.95 U
0.95 U
0.95 U
0.95 U
0.96 U
0.96 U
0.96 U
0.95 U
0.95 U
0.96 U
Pyrene
210
0.19 II
0.19 U
0.19 U
0.19 U
0.19 II
0.19 U
0.19 U
0.19 U
0.19 U
0.19 U
0.19 U
PCBe (Ufl/L)
Arodor-1242
0.5
0.096 U
0.096 II
0.1 U
0.096 U
0.096 U
0.096 U
0.096 U
0.096 U
0.095 U
0.095 U
0.097 U
Arock>r-1248
0.5
0.096 U
0.096 U
0.1 U
0.096 U
0.096 U
0.096 U
0.096 U
0.096 U
0.095 U
0.095 U
0.26
Arodor-1254
0.5
0.096 U
0.096 U
0.1 U
0.096 II
0.096 II
0.096 U
0.096 U
0.096 U
0.095 U
0.095 U
0.097 U
Metals (ufl/L)
Aluminum
7000
50 U
50 U
50 U
50 U
94 B
50 U
50 U
50 U
50 U
50 U
6900
Arsenic
10
5 U
1.3 J
5 U
5 U
5 U
5 U
5 U
5 U
3.9 J
3.8 J
2.7 J
Barium
2000
190
150
230
220
220
380
270
230
140
140
230
teryllium
4
1 UA
1 llA
1 U*
1 U
1 U
1 U
1 UA
1 U
1 U
1 U
0.54 J
Cadmium
5
1 U
1 U
1 U
1 U
1 U
1 U
1 U
1 U
1 U
1 U
1 U
Chromium
100
2 U
2 U
2 U
2 U
2 U
2 U
2 U
2 U
2 U
2 U
9.7
Cobalt
140
1 U
1.7
1 U
1 U
1 U
0.79 J
0.54 J
0.37 J
1 U
1 U
2.9
ioDDer
1300
2 U
2 U
2 U
2 U
2 U
2 U
2 U
2 U
2 U
2 U
15 B
ron
4900
1100
140
580
3200
3400
360
7600
1200
3500
3600
8100
.ead
15
1 U
1 U
1 U
1 U
1 U
0.45 J
1 U
1 U
1 U
0.72 J
6.2
Manganese
300
21
200
11
33
31
460
13
43
3700
3700
3100
Mercury
2
0.2 U
0.2 U
0.2 U
0.2 U
0.2 U
0.2 U
0.2 U
0.2 U
0.2 U
0.2 U
0.2 U
siickel
100
3.3
3.8
3.7
2 U
2 U
2 U
1.6 J
9.8
3.8
3.8
12
Selenium
50
5 U
5 U
5 U
5 U
5 U
5 U
5 U
5 U
5 U
5 U
5 U
Silver
100
1 U
1 U
1 U
1 U
1 U
1 U
1 U
1 U
1 U
1 U
1 U
rhallium
0.5
1 U
1 U
1 U
1 U
1 U
1 U
1 U
1 U
1 U
1 U
0.63 J
t/anadium
7
5 U
5 U
5 U
5 U
5 U
5 U
5 U
5 U
5 U
5 U
14
Zinc
2000
20 U
20 U
20 U
20 U
20 U
20 U
110
79
20 U
20 U
25
jwet Chemistry (ug/L)
Cvanide. Total
200
10 U
10 U
10 U
10 U
10 U
10 U
10 U
10 IJ
10 U
10 U
10 U
Page 6 of 10
-------
Table 4-2
Groundwater Sample Analytical Results - 2nd Quarter 2017
Alcoa-Davenport Works
Sample ID1
SOW
Cone1
KS-170621-F
LBD-01U-170613
LNH70619
LS(S)-170620
NEA-011-170614
NEA-021-170614
NH70614
NS-170614
OID(175>170614
Semolina Date
6/21/17
6/13/17
6/19/17
6/20/17
6/14/17
6/14/17
6/14/17
6/14/17
6/14/17
Volatlles (ug/L)
1,1,1-Trichloraethane
200
—
1 U
1 U
1 U
1 U
1 U
1 U
1 U
1 U
1,1,2,2-Tetrachloroethaiie
0.3
—
1 U
1 U
1 U
1 U
1 U
1 U
1 U
1 U
1,1,2-Trichloroethane
5
-
1 U
1 U
1 U
1 U
1 U
1 U
1 U
1 U
1,1-Dichloroethane
140
-
1 U
1 U
1 U
21
3.9
1 U
1 U
1 U
1,1-Dichloroethene
7
—
1 U
1 U
1 U
6.9
1.4
1 U
1 U
1 U
1,2-Dichlorobenzene
600
—
1 U
1 U
1 U
1 U
1 U
1 U
1 U
1 U
1,2-Dichloroethane
5
—
1 U
1 U
1 U
1 u
1 U
1 U
1 U
1 U
2-Butanone (MEK)
4000
—
10 U
10 U
10 U
10 u
10 U
10 U
10 U
10 U
Acetone
6300
—
3.5 J
3.1 J
3.7 J
4.5 J
10 U
4.6 J
4.6 J
10 U
Acrolein
3.5
-
20 U
20 U
20 U
20 U
20 U
20 U
20 U
20 U
Benzene
5
—
1 U
1 U
1 U
1 U
1 U
1 U
1 U
1 U
Bramoform
80
-
1 U
1 U
1 U
1 U
1 U
1 U
1 U
1 U
Carbon disulfide
700
-
1 U
1 U
1 U
1 U
1 U
1 U
1 U
1 U
Carbon tetrachloride
5
-
1 U
1 U
1 U
1 U
1 U
1 U
1 U
1 U
Chlorobenzene
100
—
1 U
1 U
1 U
1 U
1 U
1 U
1 U
1 U
Chloroethane
60
-
1 U
1 U
1 U
1 U
1 U
1 U
1 U
1 U
Chloroform
80
—
1 U
1 U
1 U
1 U
1 U
1 U
1 U
1 U
Chloromethane
30
-
1 U
1 U
1 U
1 U
1 U
1 U
1 U
1 U
cis-1,2-Dichloroethene
70
—
1 U
6.6
1 U
1 U
1 U
1 U
1 U
1 U
Dibromochloromethane
80
—
1 U
1 U
1 U
1 U
1 U
1 U
1 U
1 U
Ethvlbenzene
700
—
1 U
1 u
1 U
1 U
1 U
1 U
1 U
1 U
Methyl isobutyl ketone
560
—
10 U
10 u
10 U
10 U
10 u
10 U
10 U
10 U
Methylene Chloride
5
—
1 U
1 u
1 U
1 U
1 u
1 U
1 U
1 u
Tetrachloroethene
5
—
1 U
1 u
1 U
1 U
1 u
1 U
1 U
1 u
Toluene
1000
—
1 U
1 u
1 U
1 U
1 u
1 U
1 U
1 u
trans-1,2-Dichloroethene
100
—
1 U
1 u
1 U
1 U
1 u
1 U
1 U
1 u
trans-1,3-Dichloropropene
1.8
—
1 U
1 u
1 u
1 u
1 u
1 U
1 u
1 u
Trichloroethene
5
—
1 U
1 u
1 u
1 u
1 u
1 u
1 u
1 u
V/invl chloride
2
—
1 U
1 u
1 u
1 u
1 u
1 u
1 u
1 u
Xylenes, Total
10000
—
2 U
2 U
2 U
2 U
2 U
2 U
2 U
2 U
Semlvobtlles (ua/L)
Acenaphthene
420
0.19 U
0.19 U
0.19 U
0.19 U
0.19 U
0.2 U
0.19 U
0.19 U
0.19 U
Anthracene
2100
0.19 U
0.19 U
0.19 U
0.19 U
0.19 U
0.2 U
0.19 U
0.19 U
0.19 U
Benz[a1anthracene
0.24
0.19 U
0.19 U
0.19 U
0.19 U
0.19 U
0.2 U
0.19 U
0.19 U
0.19 U
Benzola]pyrene
0.2
0.19 U
0.19 U
0.19 U
0.19 U
0.19 U
0.2 U
0.19 U
0.19 U
0.19 U
Benzo[blfluoranthene
0.24
0.19 U
0.19 U
0.19 U
0.19 U
0.19 U
0.2 U
0.19 U
0.19 U
0.19 U
Benzolklfluoranthene
2.4
0.19 U
0.19 U
0.19 U
0.19 U
0.19 U
0.2 U
0.19 U
0.19 U
0.19 U
Chrysene
24
0.19 U
0.19 U
0.19 U
0.19 U
0.19 U
0.2 U
0.19 U
0.19 U
0.19 U
Dibenz(a, h)anthracene
0.024
0.19 U
0.19 U
0.19 U
0.19 U
0.19 U
0.2 U
0.19 U
0.19 U
0.19 U
~i-n-butyl phthalate
700
4.8 U
4.8 U
4.8 U
4.8 U
4.8 U
5 U
4.8 U
4.8 U
4.8 U
Fluoranthene
280
0.19 U
0.19 U
0.19 U
0.19 U
0.19 U
0.2 U
0.19 U
0.19 U
0.19 U
Fluorene
280
0.19 U
0.19 U
0.19 U
0.19 U
0.19 U
0.2 U
0.19 U
0.19 U
0.19 U
Page 7 of 10
-------
Table 4-2
Groundwater Sample Analytical Results - 2nd Quarter 2017
Alcoa-Davenport Works
Sample ID1
SOW
Cone1
KS-170621-F
LBD-01U-170613
LNH70619
LS(S)-170620
NEA-011-170614
NEA-021-170614
NH70614
NS-170614
OID(175")-170614
I Samnllna Date
6/21/17
6/13/17
6/19/17
6/20/17
6/14/17
6/14/17
6/14/17
6/14/17
6/14/17
|lndeno|1,2,3-cdlpvrene
0.24
0.19 U
0.19 U
0.19 U
0.19 U
0.19 U
0.2 U
0.19 U
0.19 U
0.19 U
Naphthalene
100
0.19 U
0.19 U
0.19 U
0.19 U
0.19 U
0.2 U
0.19 U
0.19 U
0.19 U
Phenol
2000
0.96 U
0.95 U
0.95 U
0.96 U
0.95 U
1 U
0.95 U
0.95 U
0.95 U
Pyrene
210
0.19 U
0.19 U
0.19 U
0.19 U
0.19 U
0.2 U
0.19 U
0.19 U
0.19 U
PCBs fug/L)
Aroclor-1242
0.5
0.11 U
0.095 U
0.096 U
0.095 U
0.096 U
0.096 U
0.095 U
0.096 U
0.096 U
Aroclor-1248
0.5
0.11 U
0.095 U
0.096 U
0.095 U
0.096 U
0.096 U
0.095 U
0.096 U
0.096 U
Arodar-1254
0.5
0.11 U
0.095 U
0.096 U
0.095 U
0.096 U
0.096 U
0.095 U
0.096 U
0.096 U
Metals (ug/L)
Aluminum
7000
50 U
50 U
50 U
50 U
50 U
50 U
50 U
50 U
180
Arsenic
10
0.77 J
2.9 J
1 J
1.1 J
5 U
0.93 J
5 U
15
5 U
Barium
2000
180
120
110
110
320
240
53
170
300
Beryllium
4
1 U
1 U
1 U
1 U
1 U
1 U
1 U
1 U
1 U
Cadmium
5
1 U
1 U
1 U
1 U
1 U
1 U
1 U
1 U
1.2
Chromium
100
2 U
2.8
2 U
2 U
2 U
2 U
2 U
2 U
2 U
Cobalt
140
1 U
1.2
1 U
1
1 U
1 U
0.26 J
0.28 J
0.3 J
Copper
1300
2 U
2 U
2 U
2 U
2 U
2 U
2 U
2 U
2 U
Iron
4900
240
1900
650
490
3600
8800
3900
3800
4300
Lead
15
1 U
1 U
1 U
1 U
1 U
1 U
1 U
1 U
1 U
Manganese
300
3100
920
58
64
160
180
220
150
170
Mercury
2
0.2 U
0.2 U
0.2 U
0.2 U
0.2 U
0.2 U
0.2 U
0.2 U
0.2 U
Nickel
100
4.9
3.2
2 U
3.5
2.5
2 U
1.6 J
2 U
1.8 J
Selenium
50
5 U
5 U
5 U
5 U
5 U
5 U
5 U
5 U
5 U
Silver
100
1 U
1 U
1 U
1 U
1 U
1 U
1 U
1 U
1 U
Thalium
0.5
1 U
1 U
0.21 JB
1 U
1 U
1 U
1 U
1 U
1 U
Vanadium
7
5 U
5 U
5 U
5 U
5 U
5 U
5 U
5 U
5 U
Zinc
2000
20 U
20 U
20 U
20 U
20 U
20 U
20 U
20 U
27
wet Chemistry (ug/L)
Cvanide Total
200
10 U
2.3 J
10 U
10 U
2.5 J
2.2 J
2.3 J
10 U
10 U
PageS of 10
-------
Table 4-2
Groundwater Sample Analytical Results - 2nd Quarter 2017
Alcoa-Davenport Works
Sample ID1
SOW
OID(74")-170621
OS-170614
PA-14S-170621
PA-17S-170620
WA-011-170619
WA-011-170619-F
WDS-2-170619
WDS-3-170619
WDS-5-1706161
Semolina Date
6/21/17
6/14/17
6/21/17
6/20/17
6/19/17
6/19/17
6/19/17
6/19/17
6/19/17
Volatlles (ug/L)
1,1,1-Trichloroethane
200
1 U
1 U
1 U
14 U
1 U
—
1 U
1 U
1 U
1,1,2,2-Tetrachloroetharie
0.3
1 U
1 U
1 U
14 U
1 U
—
1 U
1 U
1 U
1,1,2-Trichloroethane
5
1 U
1 U
1 U
14 U
1 U
-
1 U
1 U
1 U
1,1-Dichloroethane
140
1 U
1 U
0.71 J
10 J
1 U
-
1 U
1 U
1 U
1,1-Dichloroethene
7
1 U
1 U
0.39 J
14 U
1 U
—
1 U
1 U
1 U
1,2-Dichlorobenzene
600
1 U
1 U
1 U
14 U
1 U
—
1 U
1 U
1 U
1,2-Dichloroethane
5
1 U
1 U
1 U
14 U
1 U
—
1 U
1 U
1 U
2-Butanone (MEK)
4000
10 U
10 U
10 U
140 U
10 U
—
10 U
10 U
10 U
Acetone
6300
2.9 J
10 U
3.4 J
140 U
3.5 J
—
3.2 J
2.8 J
4.3 J
Acrolein
3.5
20 U
20 U
20 U
290 U
20 U
-
20 U
20 U
20 U
Benzene
5
1 U
1 U
1 U
14 U
1 U
—
1 U
1 U
1 U
Bromoform
80
1 U
1 U
1 U
14 U
1 U
—
1 U
1 U
1 U
Carbon disulfide
700
1 U
1 U
1 U
14 U
1 U
—
1 U
1 U
1 U
Carbon tetrachloride
5
1 U
1 U
1 U
14 U
1 U
-
1 U
1 U
1 U
Chlorobenzene
100
1 U
1 U
1 U
14 U
1 U
—
1 U
1 U
1.7
Chloroethane
60
1 U
1 U
1 U
14 U
1 U
-
1 U
1 U
1 U
Chloroform
80
1 U
1 U
1 U
14 U
1 U
—
1 U
1 U
1 u
Chloromethane
30
1 U
1 U
1 U
14 U
1 U
-
1 U
1 U
1 u
cis-1,2-Dichloroethene
70
1.2
1 U
120
1200
1 U
—
1 U
7.4
1.7
Dibromochloromethane
80
1 U
1 U
1 U
14 U
1 U
—
1 U
1 U
1 u
Ethylbenzene
700
1 U
1 U
1 u
14 U
1 U
—
1 U
1 u
1 u
Methyl isobutyl ketone
560
10 U
10 U
10 u
140 U
10 U
—
10 U
10 u
10 u
Methylene Chloride
5
1 U
1 U
1 u
14 U
1 U
—
1 U
1 u
1 u
Tetrachloroethene
5
1 U
1 u
23
3400
1 U
—
1 U
0.63 J
1 u
Toluene
1000
1 U
1 u
1 u
14 U
1 U
—
1.5
0.26 J
1 u
trans-1,2-Dichloroethene
100
1 U
1 u
1 u
6.3 J
1 U
—
1 U
1 U
1 u
trans-1,3-Dichloropropene
1.8
1 U
1 u
1 u
14 U
1 u
—
1 U
1 U
1 u
Trichloroethene
5
1 U
1 u
28
680
1 u
—
1 U
1.7
1 u
\/invl chloride
2
1 U
1 u
2.3
14 U
1 u
—
1 U
0.6 J
1 u
Xylenes, Total
10000
2 U
2 U
2 U
29 U
2 U
—
0.46 J
2 U
2 U
Semlvobtlles (ua/L)
lAcenaphthene
420
0.19 U
0.21 U
0.19 U
0.19 U
0.19 U
0.19 U
0.19 U
0.19 U
0.19 U
I Anthracene
2100
0.19 U
0.21 U
0.19 U
0.19 U
0.19 U
0.19 U
0.19 U
0.19 U
0.19 U
Benz[a]anthracene
0.24
0.19 U
0.21 U
0.19 U
0.19 U
0.19 U
0.19 U
0.19 U
0.19 U
0.19 U
Benzo[a]pyrene
0.2
0.19 U
0.21 U
0.19 U
0.19 U
0.19 U
0.19 U
0.19 U
0.19 U
0.19 U
Benzolblfluoranthene
0.24
0.19 U
0.21 U
0.19 U
0.19 U
0.19 U
0.19 U
0.19 U
0.19 U
0.19 U
Benzolklfluoranthene
2A
0.19 U
0.21 U
0.19 U
0.19 U
0.19 U
0.19 U
0.19 U
0.19 U
0.19 U
Chrysene
24
0.19 U
0.21 U
0.19 U
0.19 U
0.19 U
0.19 U
0.19 U
0.19 U
0.19 U
Dibenz(a,h)anthracene
0.024
0.19 U
0.21 U
0.19 U
0.19 U
0.19 U
0.19 U
0.19 U
0.19 U
0.19 U
Di-n-butyl phthalate
700
4.8 U
5.2 U
4.8 U
4.8 U
4.8 U
4.8 U
4.8 U
4.8 U
4.8 U
Fluoranthene
280
0.19 U
0.21 U
0.19 U
0.19 U
0.19 U
0.19 U
0.19 U
0.19 U
0.19 U
Fluorene
280
0.19 U
0.21 U
0.19 U
0.19 U
0.19 U
0.19 U
0.19 U
0.19 U
0.19 U
Page 9 of 10
-------
Table 4-2
Groundwater Sample Analytical Results - 2nd Quarter 2017
Alcoa-Davenport Works
Sample ID1
SOW
Cone1
OID(74')-170621
OS-170614
PA-14S-170621
PA-17S-170620
WA-011-170619
WA-011-170619-F
WDS-2-170619
WDS-3-170619
WDS-5-1706161
Samnllna Date
6/21/17
6/14/17
6/21/17
6/20/17
6/19/17
6/19/17
6/19/17
6/19/17
6/19/17 1
IndenoM 2 3-cdlDvrene
0.24
0.19 U
0.21 U
0.19 U
0.19 U
0.19 U
0.19 U
0.19 U
0.19 U
0.19 U I
Naphthalene
100
0.19 U
0.21 U
0.19 U
0.19 U
0.19 U
0.19 U
0.19 U
0.19 U
0.19 U
Phenol
2000
0.95 U
1 U
0.95 U
0.95 U
0.95 U
0.95 U
0.96 U
0.96 U
0.95 U
Pyrene
210
0.19 U
0.21 U
0.19 U
0.19 U
0.19 U
0.19 U
0.19 U
0.19 U
0.19 U
PCBs (ug/L)
Arodor-1242
0.5
0.095 U
0.097 U
0.095 U
0.095 U
0.096 U
0.097 U
0.13
0.22
0.096 U
Aroclor-1248
0.5
0.095 U
0.097 U
0.095 U
0.095 U
0.096 U
0.097 U
0.097 U
0.096 U
0.096 U
Arock>r-12S4
0.5
0.095 U
0.097 U
0.095 U
0.095 U
0.096 U
0.097 U
0.047 J
0.046 J
0.096 U
Metals (ug/L)
Aluminum
7000
50 U
440
50 U
50 U
350
50 U
120
88
50 U
Arsenic
10
1.1 J
5 U
0.75 J
0.99 J
0.82 J
5 U
5 U
0.87 J
1.5 J
Barium
2000
170
160
260
200
160
160
110
230
200
Beryllium
4
1 U
1 U
1 U
1 U*
1 U
0.32 J
1 U
1 U
1 UA
Cadmium
5
1 U
1 U
1 U
1 U
1 U
1 U
1 U
1 U
1 U
Chromium
100
2 U
2 U
2 U
2 U
1.2 J
2 U
1 J
2 U
2 U
Cobalt
140
0.35 J
1.6
1.3
1.2
0.46 J
1 U
0.54 J
1.8
6
Copper
1300
2 U
3.9 B
2 U
2 U
2 U
2 U
2.6 B
2 U
2 U
Iron
4900
10000
650
100 U
470
10000
1400
150
350
2000
Lead
15
1 u
1 U
1 U
1 U
0.58 J
1 U
1 U
1 U
1 U
Manganese
300
300
140
460
150
98
60
390
5300
3800
Mercury
2
0.2 U
0.2 U
0.2 U
0.2 U
0.2 U
0.2 U
0.2 U
0.2 U
02 U
Nickel
100
3.1
4.2
6.3
5.3
2.6
2 U
5.9
11
12
Selenium
50
5 U
5 U
5 U
5 U
5 U
5 U
5 U
5 U
5 U
Slver
100
1 U
1 U
1 U
1 U
1 U
1 U
1 U
1 U
1 U
Thallium
0.5
1 U
1 U
0.39 J
1 U
0.52 J B
0.33 J B
1 U
1 U
1 U
Vanadium
7
5 U
1.3 J
5 U
5 U
1.2 J
5 U
1 J
0.84 J
5 U
Zinc
2000
20 U
20 U
20 U
20 U
24
24
20 U
20 U
20 U
wet Chemistry (ua/L)
Cvanide. Total
200
10 U
2.1 J
10 U
10 U
10 U
10 U
10 U
10 U
10 U
Page 10 of 10
-------
Table 4-3
Groundwater Sample Analytical Results - 3rd Quarter 2017
Alcoa-Davenport Works
Sample ID1
SOW
AD-170915
AI-170918
ANS-170918
AS-170920
AX-170915
ED-170914
EDS-2-170913
EI-170914
ES-170919
Samollna Date
Cone
9/15/17
9/18/17
9/18/17
9/20/17
9/15/17
9/14/17
9/13/17
9/14/17
9/19/17
volatllea (ug/L)
1 1,1-Trichloroethane
200
1 U
1 U
1 U
1 U
1 U
1 U
1 U
4 U
1 U
1,1,2,2-Tetrachloroethane
0.3
1 U
1 U
1 U
1 U
1 U
1 U
1 U
4 U
1 U
1 1,2-Trichloroethane
5
1 U
1 U
1 U
1 U
1 U
1 U
1 U
4 U
1 U
1,1 -Dichloroethane
140
1 U
1 U
0.41 J
1 U
1 U
1 U
1 U
4 U
1 U
1.1 -Dichloroethere
7
1 U
1 U
1 U
1 U
1 U
1 U
1 U
4 U
1 U
1,2-Dichlorobenzene
600
1 U
1 U
1 U
1 U
1 U
1 U
1 U
4 U
1 U
1,2-Dichloraethane
5
1 U
1 U
1 U
1 U
1 U
1 U
1 U
40 U
1 U
2-Butanone (MEK)
4000
10 U
10 U
10 U
4 J
10 U
10 U
10 U
40 U
10 U
Acetone
6300
3.2 J
3.7 J
8.6 J
20
2.9 J
10 U
2.4 J
40 U
10 U
Acrolein
3.5
20 U
20 U
20 U
20 U
20 U
20 U
20 U
80 U
20 U
Benzene
5
1 U
1 U
0.71 J
1 U
1 U
1 U
1 U
870
1 U
Bromoform
80
1 U
1 U
1 U
1 U
1 U
1 U
1 U
4 U
1 U
Carbon disulfide
700
1 U
1 U
1 U
1 U
1 U
1 U
1 U
4 U
1 U
Carbon tetrachloride
5
1 U
1 U
1 U
1 U
1 U
1 U
1 U
4 U
1 U
Chlorobenzene
100
1 U
1 U
1 U
1 U
1 U
1 U
1 U
4 U
1 U
Chloroethane
60
1 U
1 U
1 U
1 U
1 U
1 U
1 U
4 U
1 U
Chloroform
80
1 U
1 U
1 U
1 U
1 U
1 U
1 U
4 U
1 U
Chloromethane
30
1 U
1 U
1 U
1 U
1 U
1 U
1 U
4 U
1 U
cis-1,2-Dichloroethene
70
1 U
1 U
0.73 J
2.7
1 U
1 U
0.67 J
4 U
1 U
~ibramochloromethane
80
1 U
1 U
1 U
1 u
1 U
1 U
1 U
4 U
1 U
Ethvfaenzene
700
1 U
1 U
1 U
1 u
1 U
1 U
1 u
4.3
1 U
Methyl isobutyl ketone
560
10 U
10 U
10 U
10 u
10 U
10 U
10 u
40 U
10 U
Methylene Chloride
5
1 U
1 U
1 U
1 u
1 U
1 U
1 u
3.8 J B
1 U
'( etrachloroethene
5
1 U
1 U
1 U
1 u
1 U
1 U
1 u
4 U
1 U
T oluene
1000
1 U
1 U
1 U
1 u
1 U
1 u
1 u
18
1 u
trans-1,2-Dichloroethene
100
1 U
1 U
1 U
1 u
1 U
1 u
1 u
4 U
1 u
trans-1,3-DichloroDroDene
1.8
1 U
1 u
1 U
1 u
1 U
1 u
1 u
4 U
1 u
T richloroethene
5
1 U
1 u
1 U
1 u
1 U
1 u
1 u
4 U
1 u
vinyl chloride
2
1 u
1 u
1 U
1 u
1 u
1 u
1 u
4 U
1 u
Xvlenes, Total
10000
2 U
2 U
2 U
2 U
2 U
2 U
2 U
26 J
2 U
Semlvolatlles (ua/Ll
Acenaphthene
420
0.19 U
0.21 U
0.48 U
0.19 U
0.2 U
0.19 U
0.2 U
0.99
0.19 U
Anthracene
2100
0.19 U
0.21 U
0.48 U
0.19 U
0.2 U
0.19 U
0.2 U
0.19 U
0.19 U
Benzlalanthracene
0.24
0.19 U
0.21 U
0.48 U
0.19 U
0.2 U
0.19 U
0.2 U
0.19 U
0.19 U
Benzo(aiDvrene
0.2
0.19 U
0.21 U
0.48 U
0.19 U
0.2 U
0.19 U
0.2 U
0.19 U
0.19 U
Benzol b jfluoranthene
0.24
0.19 U
0.21 U
0.48 U
0.19 U
0.2 U
0.19 U
0.2 U
0.19 U
0.19 U
Benzotklfluoranthene
2A
0.19 U
0.21 U
0.48 U
0.19 U
0.2 U
0.19 U
0.2 U
0.19 U
0.19 U
Chrvsene
24
0.19 U
0.21 U
0.48 U
0.19 U
0.2 U
0.19 U
0.2 U
0.19 U
0.19 U
Dibenz(a,hlanthracene
0.024
0.19 U
0.21 U
0.48 U
0.19 U
0.2 U
0.19 U
0.2 U
0.19 U
0.19 U
Di-n-butyl ohthalate
700
4.8 U
5.3 U
12 U
4.9 U
5 U
4.8 U
5 U
4.8 U
4.8 U
Fluoranthene
280
0.19 U
0.21 U
0.48 U
0.19 U
0.2 U
0.19 U
0.2 U
0.19 U
0.19 U
Fluorene
280
0.19 U
0.21 U
0.48 U
0.19 U
0.2 U
0.19 U
0.2 U
0.75
0.19 U
J:\PrajectsVArconkftDavenportM80111 Davenport 3Q17 GW Monitoring ReportYTablesM 80104 3Q17 Table 5-2jdsx
Page 1 of 10
-------
Table 4-3
Groundwater Sample Analytical Results - 3rd Quarter 2017
Alcoa-Davenport Works
Sample ID1
SOW
AD-170915
AI-170918
ANS-170918
AS-170920
AX-170915
ED-170914
EDS-2-170913
EI-170914
ES-170919
Samollna Data
9/15/17
9/18/17
9/18/17
9/20/17
9/15/17
9/14/17
9/13/17
9/14/17
9/19/17
lndeno[1,2,3-cd]pyrene
0.24
0.19 U
0.21 U
0.48 U
0.19 U
0.2 U
0.19 U
0.2 U
0.19 U
0.19 U
Naphthalene
100
0.19 U
0.21 U
0.48 U
0.19 U
02 U
0.19 U
0.2 U
0.19 U
0.19 U
Phenol
2000
0.95 U
1.1 U
2.4 U
0.97 U
0.99 U
0.96 U
0.99 U
1.3
0.95 U
Pyrene
210
0.19 U
0.21 U
0.48 U
0.19 U
02 U
0.19 U
0.2 U
0.19 U
0.19 U
PCBs (ua/L)
Arodor-1242
0.5
0.096 U
0.17
0.98 U
0.19 U
0.1 U
0.096 U
0.096 U
0.097 U
0.097 U
Arodor-1248
0.5
0.096 U
0.097 U
17
U
0.1 U
0.096 U
0.096 U
0.097 U
0.097 U
Aroclor-1254
0.5
0.096 U
0.097 U
0.98 U
0.19 U
0.1 U
0.096 U
0.096 U
0.097 U
0.097 U
Metals (ug/L)
Aluminum
7000
51
94
50 U
50 U
50 U
140 B
150 B
50 U
50 U
Arsenic
10
0.84 J
5 U
3 J
26
5 U
5 U
6.5
5 U
1.9 J
Barium
2000
230
260
1700
220
130
290
140
220
140
Beryllium
4
1 U
1 U
1 U
1 U
1 U
1 U
0.35 J
1 U
1 U
ICadmium
5
1 U
1 U
1 U
1 U
1 U
0.29 J
0.47 J
1 U
1 U
iChromium
100
1.5 J
2 U
2 U
2 U
2 U
6.7
1.2 J
2 U
2 U
ICobalt
140
1.1
0.22 J
0.25 J
2
1 U
0.43 J
4.5
1 U
1.3
iCopper
1300
7.8
2 U
2 U
4.1
2 U
3.1
2 U
2 U
2 U
Iron
4900
14000
4500
8800
9900
2800
14000
290
540
1700
Lead
15
1 U
1 U
1 U
8
1 U
1 u
0.61 J
1 U
1 U
Manganese
300
7.6
220
710
1100
28
33
2400
19
300
Mercury
2
0.2 U
0.2 U
0.2 U
0.2 U
0.2 U
0.2 U
0.2 U
0.2 U
02 U
Nickel
100
11
2 U
2 U
4
2 U
1.9 J
10
2 U
7A
Selenium
50
5 U
5 U
5 U
0.92 J
5 U
5 U
1.3 J
5 U
5 U
Silver
100
1 U
1 U
1 U
1 U
1 U
1 U
1 U
1 U
1 U
Thallium
0.5
1 U
1 U
1 U
1 U
1 U
1 U
0.27 J
1 U
1 U
Vanadium
7
5 U
5 U
5 U
9.1
5 U
5 U
1.5 J
5 U
5 U
Zinc
2000
52
20 U
20 U
20 U
240
35
20 U
20 U
20 U
Wat Chemistry (ug/L)
Cyanide, Total
200
10 u
10 U
10 U
10 U
10 U
10 U
10 U
10 U
10 U
'Filtered samples have an "F" at the end of the sample ID; duplicate samples have a "D" at the end of the sample ID
Performance Standard for organics; Monitoring Level for inorganics. Bold indicates the parameter was detected above the SOW Cone
3Because of low water level, the well purged dry and did not recover sufficiently to allow sample collection.
Data Qualifiers (refer to Appendix D for results of data validation)
B : Compound was found in the blank and sample.
J : Result is less than the RL but greater than or equal to the MDL and the concentration is an approximate value.
U : Indicates the analyte was analyzed for but not detected.
F1 : MS and/or MSD recovery is outside acceptance limits.
F2 : MS/MSD RPD exceeds control limits.
J:\Projects\Arconic\DavenpartM 80111 Davenport 3Q17 GW Monitoring Report\Tables\180104 3Q17 Table 5-2jdsx
Page 2 of 10
-------
Table 4-3
Groundwater Sample Analytical Results - 3rd Quarter 2017
Alcoa-Davenport Works
Sample ID1
SOW
FD-170914
FI-170914
FS-170919
FS-170919-F
GM-04R-170913
GM-06R-170920
GM-09-170913
GM-10-170920
HNI-170919
Semolina Date
9/14/17
9/14/17
9/19/17
9/19/17
9/13/17
9/20/17
9/13/17
9/20/17
9/19/17
Volatlles (ug/L)
1,1,1-Trichloroethane
200
1 U
1 U
1 U
-
1 U
1 U
1 U
1 U
1 U
1,1,2,2-Tetrachloroethane
0.3
1 U
1 U
1 U
-
1 U
1 U
1 U
1 U
1 U
1,1,2-Trichloroethane
5
1 U
1 U
1 U
-
1 U
1 U
1 U
1 U
1 U
1,1-Dichloroethane
140
1 U
1.7
1 U
-
1 U
1 U
0.83 J
1 U
1 U
1,1-Dichloroethene
7
1 U
0.45 J
1 U
-
1 U
1 U
1 U
1 U
1 U
1,2-Dichkjrobenzene
600
1 U
1 U
1 U
-
1 U
1 U
1 U
1 U
1 U
1,2-Dichloroethane
5
1 U
1 U
1 U
-
1 U
1 U
1 U
1 U
1 U
b-Butanone (MEK)
4000
10 U
10 U
10 U
-
10 U
2 J
10 U
10 U
10 U
Acetone
6300
10 U
3.3 J
10 U
-
7.6 J
8.3 J
10 U
3.1 J
2.8 J
Acrolein
3.5
20 U
20 U
20 U
-
20 U
20 U
20 U
20 U
20 U
Benzene
5
1 U
1 U
1 U
-
1 U
1 U
1 U
1 U
1 U
Bromoform
80
1 U
1 U
1 U
—
1 U
1 U
1 U
1 U
1 U
Carbon disulfide
700
1 U
1 U
1 U
—
1 U
1 U
1 U
1 U
1 U
Carbon tetrachloride
5
1 U
1 U
1 U
-
1 U
1 U
1 U
1 U
1 U
Chlorobenzene
100
1 U
1 U
1 U
-
1 U
1 U
1 U
1 U
1 U
Chloroethane
60
1 U
1 U
1 U
-
1 U
1 U
5.1
5.1
1 U
Chloroform
80
1 U
1 U
1 U
-
1 U
1 U
1 U
1 U
1 U
Chloromethane
30
1 U
1 U
1 U
-
1 U
1 U
1 U
1 U
1 U
cis-1,2-Dichloroethene
70
1 U
1 U
1 U
-
1 U
0.57 J
2.8
1.9
6.2
Dibromochloromethane
80
1 U
1 U
1 U
-
1 U
1 U
1 U
1 U
1 U
Ethvbenzene
700
1 U
1 U
1 U
-
1 U
1 U
1 u
1 U
1 U
Methyl isobutvl ketone
560
10 U
10 U
10 U
-
10 U
10 U
10 u
10 U
10 U
Methylene Chloride
5
1 U
1 U
1 u
-
1 U
1 U
1 u
1 U
1 U
Tetrachloroethene
5
1 U
1 U
1 u
-
1 U
1 U
1 u
1 U
1 U
Toluene
1000
1 u
1 U
1 u
-
1 U
1 U
1 u
1 U
1 U
trans-1,2-Dichloroethene
100
1 u
1 U
1 u
-
1 U
1 U
1 u
1.1
1 U
trans-1,3-Dichloropropene
1.8
1 u
1 U
1 u
-
1 U
1 U
1 u
1 U
1 U
irichloroethene
5
1 u
1 U
1 u
-
1 U
1 U
1 u
1 U
1 U
Vinyl chloride
2
1 u
1 u
1 u
-
1 u
1 U
1.7
1.3
1.3
Xylenes, Total
10000
2 U
2 U
2 U
-
2 U
2 U
2 U
2 U
2 U
Semlvo la tiled (ug/LI
Acenaphthene
420
0.19 U
0.19 U
0.21 U
0.22 U
0.77 U
0.19 U
0.76 U
0.83 U
0.23 U
Anthracene
2100
0.19 U
0.19 U
0.21 U
0.22 U
0.77 U
0.19 U
0.76 U
0.83 U
0.23 U
Benzlalanthracene
0.24
0.19 U
0.19 U
0.21 U
0.22 U
0.77 U
0.19 U
0.76 U
0.83 U
0.23 U
Benzo[a|pyrene
0.2
0.19 U
0.19 U
0.21 U
0.22 U
0.77 U
0.19 U
0.76 U
0.83 U
0.23 U
Benzofblfluoranthene
0.24
0.19 U
0.19 U
0.21 U
0.22 U
0.77 U
0.19 U
0.76 U
0.83 U
0.23 U
Benzo[k]1luoranthene
2A
0.19 U
0.19 U
0.21 U
0.22 U
0.77 U
0.19 U
0.76 U
0.83 U
0.23 U
Chrvsene
24
0.19 U
0.19 U
0.21 U
0.22 U
0.77 U
0.19 U
0.76 U
0.83 U
0.23 U
Dibenz(a,h)anthracene
0.024
0.19 U
0.19 U
0.21 U
0.22 U
0.77 U
0.19 U
0.76 U
0.83 U
0.23 U
Di-n-butvl phthalate
700
4.8 U
4.9 U
5.3 U
5.4 U
19 U
4.8 U
19 U
21 U
5.7 U
Fluoranthene
280
0.19 U
0.19 U
0.21 U
0.22 U
0.77 U
0.19 U
0.76 U
0.83 U
0.23 U
Fluorene
280
0.19 U
0.19 U
0.21 U
0.22 U
0.77 U
0.19 U
0.76 U
0.83 U
0.23 U
J:\Projects\ArconirtDavenporft180111 Davenport 3Q17 GW Monitoring Report\Tables\180104 3Q17 Table 5-2jdsx
Page 3 of 10
-------
Table 4-3
Groundwater Sample Analytical Results - 3rd Quarter 2017
Alcoa-Davenport Works
Sample ID1
SOW
FD-170914
FI-170914
FS-170919
FS-170919-F
GM-04R-170913
GM-06R-170920
GM-09-170913
GM-10-170920
HNI-170919
Samollna Date
9/14/17
9/14/17
9/19/17
9/19/17
9/13/17
9/20/17
9/13/17
9/20/17
9/19/17
IndenoM ,2,3-cdlpyrsne
0.24
0.19 U
0.19 U
0.21 U
0.22 U
0.77 U
0.19 U
0.76 U
0.83 U
0.23 U
Naphthalene
100
0.19 U
0.19 U
0.21 U
0.22 U
0.77 U
0.19 U
0.76 U
0.83 U
0.23 U
Phenol
2000
0.96 U
0.97 U
1.1 U
1.5
3.8 U
0.95 U
3.8 U
4.2 U
1.1 U
Pyrene
210
0.19 U
0.19 U
0.21 U
0.22 U
0.77 U
0.19 U
0.76 U
0.83 U
0.23 U
PCBs (ug/L)
Aroclor-1242
0.5
0.097 U
0.096 U
0.11 U
0.11 U
0.096 U
0.095 U
0.096 U
2.1 U
0.11 U
Aroclor-1248
0.5
0.097 U
0.096 U
0.11 U
0.11 U
0.79
0.81
1.8
47
0.11 U
Aroclor-1254
0.5
0.097 U
0.096 U
0.11 U
0.11 U
0.096 U
0.095 U
0.096 U
2.1 U
0.11 U
Metals (ug/L)
Aluminum
7000
50 U
50 U
50 U
50 U
50 U
50 U
770 B
44 J
50 U
Arsenic
10
5 U
5 U
3.1 J
5 U
46
16
21
27
5 U
Barium
2000
320
330
240
230
800
200
360
200
200
Beryllium
4
1 U
1 U
1 U
1 U
1 U
1 U
1 U
1 U
1 U
Cadmium
5
1 U
1 U
1 U
1 U
1 U
1 U
1 U
1 U
1 U
Chromium
100
2 U
2 U
2 U
2 U
2 U
2 U
2.1
2 U
2 U
jcobalt
140
1 U
1 U
1.5
1-4
0.85 J
0.74 J
0.59 J
0.51 J
1 U
ICopper
1300
2 U
2 U
2 U
2 U
2 U
2 U
4.2
2 U
2 U
Iron
4900
16000
21000
3900
1200
22000
15000
13000
7100
750
Lead
15
1 u
1 u
1 U
1 U
1 U
1 u
0.74 J
1 u
1 U
Manganese
300
140
420
270
260
1800
6600
2600
2800
21
Mercury
2
0.2 U
0.2 U
0.2 U
0.2 U
0.2 U
0.2 U
0.2 U
0.2 U
0.2 U
Nickel
100
2 U
2 U
6.7
5.8
2.3
2.8
1.7 J
1.6 J
3.1
Selenium
50
5 U
5 U
5 U
5 U
1 J
5 U
5 U
0.96 J
5 U
Silver
100
1 U
1 U
1 U
1 U
1 U
1 U
1 U
1 U
1 U
Thallium
0.5
1 U
1 U
1 U
1 U
1 U
1 U
1 U
1 U
1 U
Vanadium
7
5 U
5 U
5 U
5 U
1.1 J
5 U
2.6 J
1.7 J
5 U
Zinc
2000
100
20 U
20 U
20 U
20 U
20 U
20 U
20 U
20 U
Wat Chemistry (ug/L)
Cyanide, Total
200
10 U
10 U
10 U
10 U
10 U
10 U
10 U
10 U
10 U
J:\Prajects\Arconic\Davenport\180111 Davenport 3Q17 GW Monitoring RepartYTable&VI 80104 3Q17Table 5-2jdsx
Page 4 of 10
-------
Table 4-3
Groundwater Sample Analytical Results - 3rd Quarter 2017
Alcoa-Davenport Works
Volatile* (ufl/Ll
1.11-Trichloroethane
Sample ID1
Sampling Date
SOW
Cone2
1,1,2,2-Tetrachloroethane
1.1 ,2-Trichloroethane
1,1-Dichloroethane
1.1-Dichloroethene
,2-Dichlorobenzene
1,2-Dichloroethane
2-Butanone (MEK)
Acetone
Acrolein
Benzene
Bromoform
Carbon disulfide
Caitaon tetrachloride
Chlorobenzene
Chloroethane
Chloroform
Chloromethane
cis-1,2-Dichloroethene
~ibromochloromethane
Ethvlbenzene
Methyl isobutyl ketone
Methylene Chloride
! etrachloroethene
Toluene
trans-1,2-Dichloroethene
trans-1,3-Dichloropropene
frichloroethene
Vinyl chloride
Xylenes, Total
Semlvolatllea (uo/U
Acenaphthene
Anthracene
Benzlalanthracene
Benzotalpyrene
Benzolblfluoranthene
Benzofkjfluoranthene
Chrysene
Dibenzfa.htanthracene
200
0.3
140
600
4000
6300
3.5
HS(S)-170919
9/19/17
HX-170919
9/19/17
JI-170914
9/14/17
80
700
100
60
80
30
70
80
700
560
1000
100
1.8
2 U
2 U
2 U
6.8
3.1
2 U
10000
420
2100
0.24
0.2
0.24
2A
24
0.024
2 U
20 U
3.5 J
40 U
2 U
2 U
2 U
2 U
2 U
2 U
2 U
2 U
500
2 U
2 U
20 U
2.8 B
570
2 U
3.1
2 U
Di-n-butyl phthalate
Fluoranthene
Fluorene
700
280
280
420
4.5
4 U
0.19 U
0.19 Li
0.19 U
0.19 U
0.19 U
0.19 U
0.19 U
0.19 U
4.8 U
0.19 U
0.19 U
1 U
1 U
1 U
1 U
1 U
1 U
1 U
10 U
2.6 J
20 U
1 U
1 U
1 U
1 U
1 U
1 U
1 U
1 U
1.2
1 U
1 U
10 U
1 U
1 U
1 U
1 U
1 U
1 U
1 U
1 U
1 u
JI-170914-D
9/14/17
JS-170919
9/19/17
JX-170914
9/14/17
1 U
1 U
1 U
1 U
1 U
1 U
10 U
10 U
20 U
1.8
1 U
1 U
1 U
1 U
1 U
1 U
1 U
1.5
1 U
1 U
10 U
1 U
1 U
1 U
1 U
1 U
1 U
1 u
2 U
0.21 U
0.21 U
0.21 U
0.21 U
0.21 U
0.21 U
0.21 U
1 U
1 U
1 U
1 U
0.98 J
2 U
0.19 U
0.19 U
0.19 U
0.19 U
0.19 U
0.19 U
0.21 U
5.3 U
0.21 U
0.21 U
0.19 U
0.19 U
4.8 U
0.19 U
0.19 U
1 U
10 U
10 U
20 U
1.9
1 U
1 U
1 U
1 U
1 U
1 U
1 U
1.8
1 U
1 U
1 U
1 U
1 U
1 U
1 U
10 U
1.8 J
20 U
1 U
1 U
1 U
1 U
1 U
1 U
1 U
1 U
1 U
1 U
1 U
1 u
1.3 J
10 U
20 U
KD-170914
9/14/17
KI-170914
9/14/17
1 U
1 U
1 U
1 Li
1 U
1 U
1 U
10 U
2.9 J
1.7
1 U
1 U
1 U
1 U
1 U
1 U
1 U
1 U
1 U
10 u
1 u
1 u
1 u
1 u
1 u
1 u
1.1
2 U
0.19 U
0.19 U
0.19 U
0.19 U
0.19 U
0.19 U
0.19 U
0.19 U
4.8 U
0.19 U
1 U
1 U
1 U
1 U
20 U
1 U
1 U
1 U
1 U
1 U
1 U
1 U
1 U
1 U
1 U
1 U
1 U
10 u
3.1 J
20 U
KI-170914-D
9/14/17
KS-170919
9/19/17
1 U
1 U
1 U
1 U
1 U
1 U
1 U
10 U
3.4 J
1 U
1 U
1 U
1 U
1 U
1 U
1 U
1 U
1 U
1 U
10 U
1 U
1 U
1 u
1 u
1 u
1 u
1 u
2 U
0.2 U
0.2 U
10 U
1 U
1 U
1 U
1 U
1 U
1 U
1 U
2 U
0.19 U
0.2 U
0.2 U
0.2 U
0.2 U
0.2 U
0.2 U
5 U
0.2 U
0.19 U
0.2 U
0.19 U
0.19 U
0.19 U
0.19 U
0.19 U
0.19 U
0.19 U
4.8 U
0.19 U
0.19 U
1 U
1 U
1 U
1 U
1 U
10 U
0.84 J B
1 U
1 U
1 U
1 U
1 U
1 U
2 U
1 U
1 U
1 U
1 U
1 U
1 U
20 U
1 U
1 U
1 U
1 U
1 U
1 U
1 U
1 U
1 U
1 u
10 u
1 u
1 u
1 u
1 u
1 u
1 u
1 u
0.19 U
0.19 U
0.19 U
0.19 U
0.19 U
0.19 U
0.19 U
0.19 U
4.9 U
0.19 U
0.19 U
2 U
0.2 U
0.2 U
0.2 U
0.2 U
1 U
1 U
10 U
1 U
1 U
1 U
1 U
1 U
1 U
1 U
2 U
0.2 U
0.2 U
0.2 U
0.2 U
0.2 U
0.2 U
0.2 U
4.9 U
0.2 U
0.2 U
0.2 U
0.2 U
0.2 U
0.2 U
0.2 U
4.9 U
0.2 U
0.2 U
1 U
1 U
1 U
1 U
1 U
1 U
1 U
10 U
10 U
20 U
LBD-01U
1 U
1 U
1 U
1 U
1 U
1 U
1 U
1 U
1 U
1 U
1 U
10 U
1 U
1 U
1 U
1 U
1 U
1 U
1 U
2 U
0.19 U
0.19 U
0.19 U
0.19 U
0.19 U
0.19 U
0.19 U
0.19 U
4.9 U
0.19 U
0.19 U I
J:\Projects\ArconicADavenport\180111 Davenport 3Q17 GW Monitoring Report\Tables\180104 3Q17 Table 5-2.xlsx
Page 5 of 10
-------
Table 4-3
Groundwater Sample Analytical Results - 3rd Quarter 2017
Alcoa-Davenport Works
Sample ID1
SOW
Cone*
HS(S)-170919
HX-170919
J1-170914
JI-170914-D
JS-170919
JX-170914
KD-170914
KI-170914
KI-170914-D
KS-170919
LBD-01U3
I Samollna Date
9/19/17
9/19/17
9/14/17
9/14/17
9/19/17
9/14/17
9/14/17
9/14/17
9/14/17
9/19/17
ilndenoM ,2 3-cdlnyrene
0.24
0.19 U
0.21 U
0.19 U
0.19 U
0.2 U
0.19 U
0.19 U
0.2 U
0.2 U
0.19 U
—
Naphthalene
100
0.19 U
0.21 U
0.19 U
0.19 U
0.2 U
0.19 U
0.19 U
0.2 U
0.2 U
0.19 U
—
Phenol
2000
0.95 U
1.1 U
0.95 U
0.95 U
0.99 U
0.95 U
0.97 U
0.98 U
0.98 U
0.97 U
—
Pyrene
210
0.19 U
0.21 U
0.19 U
0.19 U
0.2 U
0.19 U
0.19 U
0.2 U
0.2 U
0.19 U
—
IpCBs (uo/Ll
|Arodor-1242
0.5
0.095 U
0.11 U
0.096 U
0.096 U
0.096 U
0.096 U
0.096 U
0.097 U
0.096 U
0.095 U
—
|Arodor-1248
0.5
0.095 U
0.11 U
0.096 U
0.096 U
0.096 U
0.096 U
0.096 U
0.097 U
0.096 U
0.095 U
—
|Arodor-1254
0.5
0.095 U
0.11 U
0.096 U
0.096 U
0.096 U
0.096 U
0.096 U
0.097 U
0.096 U
0.095 U
—
Metals (ug/L)
|Aluminum
7000
50 U
50 U
240 B
48 J B
65
88 B
50 U
58 B
50 U
86
—
|Arsenic
10
1.6 J
5 U
5 U
5 U
5 U
5 U
5 U
8.7
8.7
5 U
-
iBarium
2000
180
230
240
240
410
280
240
130
120
180
—
Beryllium
4
1 U
1 U
1 U
1 U
1 U
1 U
1 U
1 U
1 U
1 U
-
Cadmium
5
1 U
1 U
1 U
1 U
1 U
1 U
1 U
1 U
1 U
1 U
—
Chromium
100
2 U
2 U
1.5 J
2 U
2 U
2 U
2 U
2 U
2 U
2 U
—
Cobalt
140
1.7
1 U
0.36 J
1 U
0.66 J
0.44 J
0.65 J
1 U
1 U
1 U
-
Copper
1300
2 U
2 U
2 U
2 U
2 U
2 U
2 U
2 U
2 U
2 U
—
llron
4900
560
940
7800
1200
260
6400
1300
3500
3400
870
—
Lead
15
1 U
1 U
1 U
1 U
0.95 J
1 U
1 U
1 U
1 U
1 U
—
Manganese
300
82
10
44
28
600
21
54
3600
3600
3100
—
Mercury
2
0.2 U
0.2 U
0.2 U
0.2 U
0.2 U
0.2 U
0.2 U
0.2 U
0.2 U
0.2 U
-
Nickel
100
4.1
3.4
2 U
2 U
4.1
2 U
9.6
3.7
3.7
4.7
-
|Selenium
50
5 U
5 U
5 U
5 U
5 U
5 U
5 U
5 U
5 U
5 U
-
(Silver
100
1 U
1 U
1 U
1 U
1 U
1 U
1 U
1 U
1 U
1 U
—
(Thallium
0.5
1 U
1 U
1 U
1 U
1 U
1 U
1 U
1 U
1 U
1 U
—
IVanadium
7
5 U
5 U
5 U
5 U
5 U
5 U
5 U
5 U
5 U
5 U
—
|Zinc
2000
20 U
43
20 U
20 U
20 U
55
38
20 U
20 U
20 U
—
jlBtet Chemistry (ug/L)
bvanide. Total
200
10 U
10 U
10 U
10 U
10 U
10 U
10 U
10 U
10 U
10 U
-
J:\Projects\Arconic\Davenport\180111 Davenport 3Q17 GW Monitoring Repor1\Tables\180104 3Q17 Table 5-2jdsx
Page 6 of 10
-------
Table 4-3
Groundwater Sample Analytical Results - 3rd Quarter 2017
Alcoa-Davenport Works
Sample ID1
SOW
LNI-170918
LS(S)-170918
NEA-011-170913
NEA-021-170913
NM 70915
NS-170915
NS-170915-F
OID(17S')-170913
Samolina Date
Cone
9/18/17
9/18/17
9/13/17
9/13/17
9/15/17
9/15/17
9/15/17
9/13/17
/olatiles (ug/L)
1,1,1-Trichloroethane
200
1 U
1 U
1 U
1 U
1 U
1 U
—
1 U
1,1,2,2-TetrachloFoethane
0.3
1 U
1 U
1 U
1 U
1 U
1 U
—
1 U
1,1,2-Trichloroethane
5
1 U
1 U
1 U
1 U
1 U
1 U
—
1 U
1,1 -Dichloroethane
140
1 U
1 U
19
4
1 U
1 U
—
1 U
1.1 -Dichtoroethene
7
1 U
1 U
6.8
1.4
1 U
1 U
—
1 U
1,2-DichloFobenzene
600
1 U
1 U
1 U
1 U
1 U
1 U
—
1 U
1,2-Dichloroethane
5
1 U
1 U
1 U
1 U
1 U
1 U
—
1 U
2-Butanone (MEK)
4000
10 U
10 U
10 U
10 U
10 U
10 U
-
10 U
Acetone
6300
10 U
3.7 J
10 U
3.6 J
2.9 J
4.2 J
—
5 J
Acrolein
3.5
20 U
20 U
20 U
20 U
20 U
20 U
—
20 U
Benzene
S
1 U
1 U
1 U
1 U
1 U
1 U
—
1 U
Bromoform
80
1 U
1 U
1 U
1 U
1 U
1 U
—
1 U
Carbon disulfide
700
1 U
1 U
1 U
1 U
1 U
1 U
—
1 U
Carbon tetrachloride
5
1 U
1 U
1 U
1 U
1 U
1 U
—
1 U
Chlorobenzene
100
1 U
1 U
1 U
1 U
1 U
1 U
—
1 U
Chloroethane
60
1 U
1 U
1 U
1 U
1 U
1 U
—
1 U
Chloroform
80
1 U
1 U
1 U
1 U
1 U
1 U
—
1 U
Chloromethane
30
1 U
1 U
1 U
1 U
1 U
1 U
—
1 U
cis-1,2-Dichloroethene
70
6.1
1 U
1 U
1 U
1 U
1 U
—
1 U
~ibromochloromethane
80
1 U
1 U
1 U
1 U
1 U
1 U
—
1 U
Ethvlbenzene
700
1 U
1 U
1 U
1 U
1 U
1 U
—
1 U
Methyl isobutyl ketone
560
10 U
10 U
10 U
10 U
10 U
10 U
—
10 U
Methylene Chloride
5
1 U
1 U
1 U
1 U
0.64 J B
1 U
—
1 U
Tetrachloroethene
5
1 U
1 U
1 U
1 U
1 U
1 U
—
1 U
Toluene
1000
1 u
1 U
1 u
1 U
1 U
1 U
—
1 U
trans-1,2-Dichloroethene
100
1 u
1 U
1 u
1 U
1 U
1 U
—
1 u
lrans-1,3-DichloroproDene
1.8
1 u
1 u
1 u
1 U
1 U
1 U
—
1 u
Trichloroethene
5
1 u
1 u
1 u
1 U
1 U
1 U
—
1 u
Vinyl chloride
2
1 u
1 u
1 u
1 u
1 U
1 u
—
1 u
Xylenes. Total
10000
2 U
2 U
2 U
2 U
2 U
2 U
—
2 U
Semlvolatllea (ua/L)
Acenaphthene
420
0.21 U
0.19 U
0.2 U
0.2 U
0.19 U
0.21 U
0.2 U
0.19 U
Anthracene
2100
0.21 U
0.19 U
0.2 U
0.2 U
0.19 U
0.21 U
0.2 U
0.19 U
3enz[alanthracene
0.24
0.21 U
0.19 U
0.2 U
0.2 U
0.19 U
0.21 U
0.2 U
0.19 U
BenzolalDyrene
0.2
0.21 U
0.19 U
0.2 U
0.2 U
0.19 U
0.21 U
0.2 U
0.19 U
Benzolblfluoranthene
0.24
0.21 U
0.19 U
0.2 U
0.2 U
0.19 U
0.21 U
0.2 U
0.19 U
izz j'~ r —
Senzofklfluoranthene
2.4
0.21 U
0.19 U
0.2 U
0.2 U
0.19 U
0.21 U
0.2 U
0.19 U
Chrvsene
24
0.21 U
0.19 U
0.2 U
0.2 U
0.19 U
0.21 U
0.2 U
0.19 U
Dibenz(a,h)anthracene
0.024
0.21 U
0.19 U
0.2 U
0.2 U
0.19 II
0.21 U
0.2 U
0.19 U
Di-n-butvi ohthalate
700
5.3 U
4.8 U
4.9 U
5 U
4.8 U
5.2 U
5 U
4.9 U
Fluoranthene
280
0.21 U
0.19 U
0.2 U
0.2 U
0.19 U
0.21 U
0.2 U
0.19 U
Fluorene
280
0.21 U
0.19 U
0.2 U
0.2 U
0.19 U
0.21 U
0.2 U
0.19 U
J:\Projects\Arconic\Oavenporf\180111 Davenport 3Q17 GW Monitoring Report\Tables\180104 3Q17 Table 5-2jdsx
Page 7 of 10
-------
Table 4-3
Groundwater Sample Analytical Results ¦ 3rd Quarter 2017
Alcoa-Davenport Works
I Sample ID1
SOW I LNI-170918
LS(S)-170918
NEA-011-170913
NEA-021-170913
NI-170915
NS-170915
NS-170915-F
OID(17S')-170913
I Samnllna Date
f 9/16/17
9/18/17
9/13/17
9/13/17
9/15/17
9/15/17
9/15/17
9/13/17
IndenoM 2 3-cd]oyrene
0.24
0.21 U
0.19 U
0.2 U
0.2 U
0.19 U
0.21 U
0.2 U
0.19 U
Naphthalene
100
0.21 U
0.19 U
0.2 U
0.2 U
0.19 U
0.21 U
0.2 U
0.19 U
jpttenol
2000
1.1 U
0.95 U
0.98 U
0.99 U
0.95 U
1 U
0.99 U
0.97 U
|Pyrene
210
0.21 U
0.19 U
0.2 U
0.2 U
0.19 U
0.21 U
0.2 U
0.19 U
jPCBs (uo/L)
taocior-1242
0.5
0.1 U
0.096 U
0.096 U
0.098 U
0.096 U
0.11 U
0.096 U
0.097 U
|Aroclor-1248
0.5
0.1 U
0.096 U
0.096 U
0.098 U
0.096 U
0.11 U
0.096 U
0.097 U
lAroclor-1254
0.5
0.1 U
0.096 U
0.096 U
0.098 U
0.096 U
0.11 U
0.096 U
0.097 U
(Metals (uo/L)
(Aluminum
7000
50 U
50 U
120 B
50 U
50 U
50 U
50 U
150 B
(Arsenic
10
5 U
0.76 J
1.3 J
0.93 J
0.85 J
11
7.8
5 U
(Barium
2000
100
110
330
240
57
180
130
320
(Berylium
*
1U
1 U
0.7 J
1 U
1 U
1 U
1 U
1 U
(Cadmium
5
1 u
1 U
0.77 J
1 U
1 U
1 U
1 U
1 u
Chromium
100
2 U
2 U
5.2
2 U
2 U
2 U
2 U
2 U
(cobalt
140
1 U
1
0.81 J
1 U
0.28 J
0.35 J
0.36 J
0.36 J
ICopper
taoo
2 U
2 U
2 U
17
2 U
2 U
2 U
2 U
Ilron
4900
620
420
3000
9500
7100
8300
1600
4200
Lead
15
1 U
1 U
0.77 J
1 U
1 U
1 U
1 U
1 U
Manganese
300
55
62
160
170
240
180
170
180
Mercury
I
2
0.2 U
0.2 U
0,-'
0.2 U
0.2 U
0.2 U
0.2 U
0.2 U
IMickel
100
1.5 J
3.4
5.2
2 U
1.5 J
1.6 J
2 U
2.2
fSelenium
50
5 U
5 U
1.4 J
5 U
5 U
5 U
5 U
5 U
Silver
100
1 U
1 U
1 U
1 U
1 U
1 U
1 U
1 U
iThalium
0.5
TIT"
1 U
0.26 J
1 U
1 U
1 U
1 U
1 U
K/anadium
7
5 U
5 U
5 U
5 U
5 U
5 U
5 U
5 U
izinc
2000
20 U
20 U
20 U
20 U
20 U
20 U
20 U
56
Wet Chemistry (ug/L)
fcvanide Total
200
10 U
10 U
10 U
10 U
10 U
10 U
10 U
10 U
J:\Projects\Arconic\Davenport\1B0111 Davenport 3Q17 GW Monitoring Report\Tables\180104 3Q17 Table 5-2 jdsx
Page 8 of 10
-------
Table 4-3
Groundwater Sample Analytical Results - 3rd Quarter 2017
Alcoa-Davenport Works
Sample ID1
SOW
Cone2
OID(74>170919
OS-170913
PA-14S-170919
PAp17S-170919
WA-01M70918
WDS-2-170912
WDS-3-170912
WDS-5-170912
Sampling Date
9/19/17
9/13/17
9/19/17
9/19/17
9/18/17
9/12/17
9/12/17
9/12/17
Volatile* (ug/L)
111 -Trichloroethane
200
1 U
1 U
1 U
13 U
1 U
1 U
1 U
1 U
1,1,2,2-Tetrachloroethane
0.3
1 U
1 U
1 U
13 U
1 U
1 U
1 U
1 U
11 2-Trichloroethane
5
1 U
1 U
1 U
13 U
1 U
1 U
1 U
1 U
1,1-Dichloraethane
140
1 U
1 U
0.7 J
12 J
1 U
1 U
1 U
1 U
1,1-Dichloroethene
7
1 U
1 U
1 U
13 U
1 U
1 U
1 U
1 U
1,2-Dichlorobenzene
600
1 U
1 U
1 U
13 U
1 U
1 U
1 U
1 U
1,2-Dichloroethane
5
1 U
1 U
1 U
13 U
1 U
1 U
1 U
1 U
2-Butanone (MEK)
4000
10 U
10 U
10 U
130 U
10 U
10 U
10 U
10 U
Acetone
6300
2.1 J
4.5 J
3.2 J
130 U
2.6 J
10 U
10 U
10 U
Acrolein
3.5
20 U
20 U
20 U
250 U
20 U
20 U
20 U
20 U
Benzene
5
1 U
1 U
1 U
13 U
1 U
1 U
1 U
1 U
Bromoform
80
1 U
1 U
1 U
13 U
1 U
1 U
1 U
1 U
Carbon disulfide
700
1 U
1 U
1 U
13 U
1 U
1 U
1 U
1 U
Carbon tetrachloride
5
1 U
1 U
1 U
13 U
1 U
1 U
1 U
1 U
Chlorobenzene
100
1 U
1 U
1 U
13 U
1 U
1 U
1 U
1 U
Chloroethane
60
1 U
1 U
1 U
13 U
1 U
1 U
1 U
1 U
Chloroform
80
1 U
1 U
1 U
13 U
1 U
1 U
1 U
1 U
Chloromethane
30
1 U
1 U
1 U
13 U
1 U
1 U
1 U
1 U
cis-1,2-Dichloroethene
70
1.1
1 U
110
1600
1 U
1 U
3.7
3
Dibromochloromethane
80
1 U
1 U
1 u
13 U
1 U
1 U
1 U
1 U
Ethvbenzene
700
1 U
1 U
1 u
13 U
1 U
1 U
1 u
1 U
Methyl isobutyl ketone
560
10 U
10 U
10 u
130 U
10 U
10 U
10 u
10 U
Methylene Chloride
5
1 U
1 U
1 u
13 U
1 U
1 U
1 u
1 U
Tetrachloroethene
5
1 U
1 U
17
3500
1 U
1 u
1 u
1 U
T oluene
1000
1 U
1 U
1 u
13 U
1 U
1 u
1 u
1 U
trans-1,2-Dichloroethene
100
1 U
1 U
1 u
6.2 J
1 U
1 u
1 u
1 U
trans-1,3-Dichloropropene
1.8
1 U
1 u
1 u
13 U
1 u
1 u
1 u
1 U
rrichloroethene
5
1 U
1 u
16
630
1 u
1 u
1 u
1 U
Vinyl chloride
2
1 u
1 u
1.4
13 U
1 u
1 u
1 u
1 U
Xylenes, Total
10000
2 U
2 U
2 U
25 U
2 U
2 U
2 U
2 U
Semlvo la tiles (ua/L)
Acenaphthene
420
0.21 U
0.22 U
0.23 U
0.19 U
0.21 U
0.22 U
0.2 U
0.19 U
Anthracene
2100
0.21 U
0.22 U
0.23 U
0.19 U
0.21 U
0.22 U
0.2 U
0.19 U
Benzlalanthracene
0.24
0.21 U
0.22 U
0.23 U
0.19 U
0.21 U
0.22 U
0.2 U
0.19 U
Benzojalpyrene
0.2
0.21 U
0.22 U
0.23 U
0.19 U
0.21 U
0.22 U
0.2 U
0.19 U
Benzofbjfluoranthene
0.24
0.21 U
0.22 U
0.23 U
0.19 U
0.21 U
0.22 U
0.2 U
0.19 U
Benzol k]1luoranthene
2.4
0.21 U
0.22 U
0.23 U
0.19 U
0.21 U
0.22 U
0.2 U
0.19 U
Chrvsene
24
0.21 U
0.22 U
0.23 U
0.19 U
0.21 U
0.22 U
0.2 U
0.19 U
Dibenz(a,h)anthracene
0.024
0.21 U
0.22 U
0.23 U
0.19 U
0.21 U
0.22 U
0.2 U
0.19 U
Di-n-butvl phthalate
700
5.2 U
5.4 U
5.8 U
4.8 U
5.2 U
5.4 U
5 U
4.9 U
Fluoranthene
280
0.21 U
0.22 U
0.23 U
0.19 U
0.21 U
0.22 U
0.2 U
0.19 U
Fluorene
280
0.21 U
0.22 U
0.23 U
0.19 U
0.21 U
0.22 U
0.2 U
0.19 U
J:\Projects\Arconic\Davenport\180111 Davenport 3Q17 GW Monitoring ReportYTables\180104 3Q17 Table 5-2jdsx
Page 9 of 10
-------
Table 4-3
Groundwater Sample Analytical Results - 3rd Quarter 2017
Alcoa-Davenport Works
Sample D1
SOW
Cone2
OID(74>170919
OS-170913
PA-14S-170919
PA-17S-170919
WAr01l-170918
WDS-2-170912
WDS-3-170912
WDS-5-170912
Sampling Date
9/19/17
9/13/17
9/19/17
9/19/17
9/18/17
9/12/17
9/12/17
9/12/17
IndenoM ,2.3-cdlovrene
0.24
0.21 U
0.22 U
0.23 U
0.19 U
0.21 U
0.22 U
0.2 U
0.19 U
Naphthalene
100
0.21 U
0.22 U
0.23 U
0.19 U
0.21 U
0.22 U
0.2 U
0.19 U
Phenol
2000
1 U
1.1 U
1.2 U
0.95 U
1 U
1.1 U
1 U
0.97 U
Pyrene
210
0.21 U
0.22 U
0.23 U
0.19 U
0.21 U
0.22 U
0.2 U
0.19 U
PCBs (ua/L)
Arodor-1242
0.5
0.1 U
0.1 U
0.11 U
0.095 U
0.1 U
0.11 U
0.11 U
0.099 U
Aroclor-1248
0.5
0.1 U
0.1 U
0.11 U
0.095 U
0.1 U
0.11 U
0.11 U
0.099 U
Aroclor-1254
0.5
0.1 U
0.1 U
0.11 U
0.095 U
0.1 U
0.11 U
0.11 U
0.099 U
Metals (ug/L)
Aluminum
7000
50 U
100 B
50 U
50 U
83
110
92
120
Arsenic
10
0.78 J
5 U
1 J
5 U
5 U
0.92 J
1 J
1.8 J
Barium
2000
170
130
310
220
150
100
250
210
Beryllium
4
1 U
1 U
1 U
1 U
1 U
1 U
1 U
1 U
Cadmium
5
1 U
1 U
1 U
1 U
1 U
0.23 J
0.25 J
1 U
Chromium
100
2 U
2 U
2 U
2 U
2 U
2 U
2 U
2 U
Cobalt
140
0.41 J
0.41 J
1.4
1.3
0.2 J
0.4 J
1.9
7
Copper
1300
2 U
2 U
2 U
2 U
2 U
2.4
2
2 U
Iron
4900
11000
180
760
500
4300
140
390
1200
Lead
15
1 u
1 U
1 U
1 U
1 U
1 U
1 U
1 U
Manganese
300
280
51
440
150
70
250
5700
3400
Mercury
2
0.2 U
0.2 U
0.2 U
0.2 U
0.2 U
0.2 U
0.2 U
0.2 U
Nickel
100
2.3
3.8
6.1
5.9
2 U
3.1
11
13
Selenium
50
5 U
5 U
5 U
5 U
5 U
5 U
5 U
5 U
Silver
100
1 U
1 U
1 U
1 U
1 U
1 U
1 U
1 U
Thallium
0.5
1 U
1 U
1 U
1 U
1 U
1 U
1 U
1 U
Vanadium
7
5 U
5 U
5 U
5 U
5 U
0.85 J
5 U
5 U
Zinc
2000
20 U
20 U
20 U
20 U
46
20 U
20 U
20 U
Wet Chemistry (ug/L)
Cyanide, Total
200
10 U
10 U
10 U
10 U
10 U
10 U
10 U
10 U
J:\Projects\ArconkADavenportM80111 Davenport 3Q17 GW Monitoring ReportVTables\180104 3Q17 Table 5-2jdsx
Page 10 of 10
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Table 4-4
Groundwater Sample Analytical Results - 1st Semiannual Event 2018
Alcoa-Davenport Works
Sample D1
SOW
Cone2
ANS-180316
ANS-1B0316-F
AS-1B0316
GM-04R-180319
GM-Q4R-180319-F
GM-06R-180319
GM-09-180320
GM-09-180320-F
GM-10-180321
Sanmina Date
3/16/18
3/16/18
3/16/18
3/10/18
3/10/1B
3/19/18
3/20/18
3/20/18
3/21/18
Volatile* (ua/L)
1,1,1-Trichloroethane
200
—
—
—
—
—
—
—
—
—
1,1,2,2-Tetrachloroethane
0.3
—
—
—
—
—
—
—
—
—
1,1,2-T richloroethane
5
—
—
—
—
—
—
—
—
—
1,1-Dichloroethane
140
—
—
—
—
—
—
—
—
—
1,1-Dichloroethene
7
—
—
—
—
—
—
—
—
—
1,2-Dichlorobenzene
600
—
—
—
—
—
—
—
—
—
1,2-Dichloroethane
5
—
—
—
—
—
—
—
—
—
2-Butanone (MEK)
4000
—
—
—
—
—
—
—
—
—
Acetone
6300
—
—
—
—
—
—
—
—
—
Acrolein
3.5
—
—
—
—
—
—
—
—
—
Benzene
5
—
—
—
—
—
—
—
—
—
3romoform
80
—
—
—
—
—
—
—
—
—
Carbon disulfide
700
—
—
—
—
—
—
—
—
—
Carbon tetrachloride
5
—
—
—
—
—
—
—
—
—
Chlorobenzene
100
—
—
—
—
—
—
—
—
—
Chloroethane
60
—
—
—
—
—
—
—
—
—
Chloroform
80
—
—
—
—
—
—
—
—
—
Chloromethane
30
—
—
—
—
—
—
—
—
—
as-1,2-Dichloroethene
70
—
—
—
—
—
—
—
—
—
Dibromochloromethane
80
—
—
—
—
—
—
—
—
—
Ethvbenzene
700
—
—
—
—
—
—
—
—
—
Methyl isobutyl ketone
560
—
—
—
—
—
—
—
—
—
Methylene Chloride
5
—
—
—
—
—
—
—
—
—
retrachloroethene
5
—
—
—
—
—
—
—
—
—
Toluene
1000
—
—
—
—
—
—
—
—
—
lrans-1,2-Dichloroethene
100
—
—
—
—
—
—
—
—
—
!ran&-1,3-Dichloropropene
1.8
—
—
—
—
—
—
—
—
—
Trichloroethene
5
—
—
—
—
—
—
—
—
—
k/invl chloride
2
—
—
—
—
—
—
—
_
—
Xylenes, Total
10000
—
—
—
—
—
—
—
—
—
PCBs (ufl/L)
^rocbr-1242
0.5
0.52 U
0.11 U
0.1 u
0.51
0.16
0.1 u
0.52 U
0.1 u
10 u
Aroclor-1248
0.5
14
0.42
1,6
0.11 u
0.11 U
0.47
3.1
0.1 p
81
<\roclor-1254
0.5
0.52 U
0.11 U
0.1 u
0.038 J 0
0.11 U
0.1 U
0.52 U
0.1 u
10 u
'Filtered samples have an "F" at the end of the sample ID; duplicate samples have a "D* at the end of the sample ID
'Performance Standard. Bold indicates the parameter was detected above the SOW Concentration
—: not analyzed
Data Qualifiers (refer to Appendix D for results of data validation)
B: Compound was found in the blank and sample.
J : Result is less than the RL but greater than or equal to the MDL and the concentration is an approximate value.
U : Indicates the analyte was analyzed for but not detected.
F1 : MS and/or MSD recovery is outside acceptance limits.
p: %RPD between primary and confirmation column/detector is > 40%; the lower value is reported.
J:\ProjectsWcanic\Davenport\180515 Davn LTM 1Q18 GW Rpt\Tables\1B05151Q18 Table 5-2jdsx
Page 1 of 2
-------
Table 4-4
Groundwater Sample Analytical Results - 1st Semiannual Event 2018
Alcoa-Davenport Works
Sample D1
SamDlina Date
Volatile* (uo/U
1.1.1-Trichloroethane
1,1,2 2-Tetrachloroethane
1.1.2-T richloroethane
1,1-Dichloroethane
1.1-Dichloroethene
1.2-Dichlorobenzene
1,2-Dichloroethane
2-Butanone (MEK)
Acetone
Acrolein
Benzene
Bromoform
Carbon disulfide
Carbon tetrachloride
Chlorobenzene
SOW
Cone1
200
0.3
5
140
7
600
5
4000
6300
3.5
5
80
700
5
100
60
GM-10-180321-D
3/21/18
GM-10-180321-F
3/21/18
HNI-180320
3/20/18
1 U
1 U
1 U
1 U
1 U
1 U
1 U
10 U
10 U
20 U
1 U
1 U
1 U
1 U
1 U
1 U
HS(S)-180320
3/20/18
2.5 U
2.5 U
2.5 U
6.7
1.4 J
2.5 U
2.5 U
25 U
25 U
50 U
2.5 U
2.5 U
2.5 U
2.5 U
2.5 U
2.5 U
HX-180320
3/20/18
1 U
1 U
1 U
1 U
1 U
1 U
1 U
10 U
10 U
20 U
1 U
1 U
1 U
1 U
1 U
1 U
LNI-180318
3/19/18
1 U
1 U
1 U
1 U
1 U
1 U
1 U
10 U
10 U
20 U
1 U
1 U
1 U
1 U
1 U
1 U
LS(S)-180319
3/19/18
1 U
1 U
1 U
1 U
1 U
1 U
1 U
10 U
10 U
20 U
1 U
1 U
1 U
1 U
1 U
1 U
PA-14S-180320
3/20/18
1 U
1 U
1 U
0.37 J
1 U
1 U
1 U
10 U
10 U
20 U
1 U
1 U
1 U
1 U
1 U
1 U
PA-17S-180320
3/20/18
10 U
10 U
10 U
6 J
10 U
10 U
10 U
100 U
100 U
200 U
10 U
10 U
10 U
10 U
10 U
10 u
PA-17S-180320-D
3/20/18
10 U
10 U
10 U
5.7 J
10 U
10 U
10 U
100 U
100 U
200 U
10 U
10 U
10 U
10 U
10 U
10 u
Chloroform
Chloromethane
cis-1 .2-Dichloroethene
Dibromochloromethane
Ethvlbenzene
Methyl isobutvl ketone
Methylene Chloride
Tetrachloroethene
Toluene
irans-1,2-Dichloroethene
trans-1,3-Dichloropropene
Trichloroethene
Vinyl chloride
Xvlenes, Total
PCBs fuu/Ll
ftrodor-1242
Arodor-1248
Aroclor-1254
80
30
70
80
700
560
5
5
1000
100
1.8
5
2
10000
0.5
0.5
0.5
2 U
27
2 U
0.1 U
1.1
0.1 u
1 U
1 U
5.5
1 U
1 U
10 U
1 U
1 U
1 U
1 U
1 U
1 U
1.2
2 U
2.5 U
2.5 U
540
2.5 U
2.5 U
25 U
3.6 B
550
2.5 U
10
2.5 U
500
2.5 U
5 U
1 U
1 U
1.3
1 U
1 U
10 U
1 U
1 U
1 U
1 U
1 U
1 U
1 u
2 U
1 U
1 U
6.2
1 U
1 U
10 U
1 U
1 U
1 U
1 U
1 U
1 u
1 u
2 U
_
1 U
1 U
1 U
1 U
1 U
10 U
1 U
1 u
1 u
1 u
1 u
1 u
1 u
2 U
1 U
1 U
56
1 U
1 U
10 U
1 U
3.9
1 U
1
1 U
4.6
2.5
2 U
10 u
10 u
850
10 u
10 u
100 u
24 B
2600 F1
10 u
3 J
10 U
430
10 u
20 U
10 u
10 u
960
10 u
10 u
100 u
26 B
2800
10 u
3.5 J
10 U
420
10 u
20 U
''Filtered samples have an *F* at the end of the sample ID; duplicate samples have a "D* at the end of the sample ID
'Performance Standard. Bold indicates the parameter was detected above the SOW Concentration
—: not analyzed
nata Qualifiers (refer to Appendix D for results of data validation)
B: Compound was found in the blank and sample.
J: Result is less than the RL but greater than or equal to the MDL and the concentration is an approximate value.
U : Indicates the analyte was analyzed for but not detected.
F1: MS and/Or MSD recovery is outside acceptance limits.
p: %RPD between primary and confirmation column/detector is > 40%; the lower value is reported.
J:\Projects\Arconic\Davenport\180515 Davn LTM 1Q18 GW RpttTables\180515 1Q18 Table 5-2-xlsx
Page 2 of 2
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Table 4-5
Groundwater Sample Analytical Results - 2nd Semiannual Event 2018
Alcoa-Davenport Works
Sample ID1
SOW
Cone2
AD-180926
AI-180926
ANS-180928
AS-180925
EDS-2-180925
GM-04R-180925
GM-06R-180925
GM-09-180925
GM-10-180928
Samollna Date
9/26/18
9/26/18
9/28/18
9/25/18
9/25/18
9/25/18
9/25/18
9/25/18
9/28/18
Volatlles (ug/L)
1,1,1 -T richloroethane
200
—
—
1 U
1 U
1 U
—
1 U
1 U
1 U
1,1,2,2-Tetrachloroethane
0.3
—
—
1 U
1 U
1 U
—
1 U
1 U
1 U
1 1 2-Trichloroethane
5
—
—
1 U
1 U
1 U
—
1 U
1 U
1 U
1 1-Dichloroethane
140
0.33 J
0.45 J
1 U
—
1 U
1 U
0.51 J
1,1-Dichloroethene
7
1 U
1 U
1 U
1 U
1 U
1 U
1,2-Dichlorobenzene
600
1 U
1 U*
1 U*
1 U*
1 U*
1 U
1 2-Dichloroethane
5
—
—
1 U
1 U
1 U
—
1 U
1 U
1 U
2-Butanone (MEK)
4000
10 U
10 U
10 U
10 U
10 U
10 U
Acetone
6300
—
—
6.8 J
10 U
10 U
—
10 U
5.4 J
10 U
Acrolein
3.5
—
—
20 U
20 U
20 U
—
20 U
20 U
20 U
Benzene
5
—
—
0.62 J
1 U
0.23 J
—
1 U
1 U
0.13 J
Bromoform
80
—
—
1 U
1 U
1 U
—
1 U
1 U
1 U
Carbon disulfide
700
1 U
1 U
1 U
1 U
1 U
1 U
Carbon tetrachloride
5
—
—
1 U
1 U
1 U
—
1 U
1 U
1 U
Chlorobenzene
100
—
—
1 U
1 U
1 U
—
1 U
1 U
1 U
Chloroethane
60
—
—
1 U
1 U
1 U
—
1 U
1 U
16
Chloroform
80
—
—
1 U
1 U
1 U
—
1 U
1 U
1 U
Chloromethane
30
—
—
1 U
1 U
1 U
—
1 U
1 U
1 U
cis-1,2-Dichloroethene
70
—
—
0.66 J
1.1
0.84 J
—
0.75 J
0.43 J
2
Dibromochloromethane
80
—
—
1 U
1 U
1 U
—
1 U
1 U
1 U
Ethvlbenzene
700
—
—
0.12 J
1 U
1 U
—
1 U
1 U
1 U
Methyl isobutyl ketone
560
—
—
10 U
10 U
10 U
—
10 U
10 U
10 u
Methylene Chloride
5
—
—
5 U
5 U
5 U
—
5 U
5 U
5 U
Tetrachloroethene
5
—
—
0.71 J
0.58 J
1 U
—
1 U
1 U
1 U
Toluene
1000
—
—
0.22 J
0.23 J
1 U
—
1 U
1 U
0.29 J
irans-1,2-Dichloroethene
100
—
—
0.21 J
1 U
1 U
—
1 U
1 U
0.88 J
i rans-1,3-Dichloropropene
1.8
—
—
1 U
1 U
1 U
—
1 U
1 U
1 U
Trichloroethene
5
—
—
0.12 J
0.15 J
0.19 J
—
1 U
1 U
0.38 J
Vinyl chloride
2
—
—
1 U
1 U
0.92 J
—
1 U
0.21 J
2.1
Xylenes, Total
10000
—
—
0.24 J
2 U
2 U
—
2 U
2 U
0.4 J
PCBs lua/U
Aroclor-1242
0.5
0.097 U
0.16
1.9 U
0.55 U
—
0.1 U
0.11 U
0.095 U
0.5 U
Aroclor-1248
0.5
0.087 J
0.095 U
27
3.8
0.63
0.73
0.91
5.5
Aroclor-1254
0.5
0.097 U
0.095 U
1.9 U
0.55 U
—
0.1 u
0.11 u
0.095 U
0.5 U
1Filtered samples have an "F" at the end of the sample ID; duplicate samples have a "D" at the end of the sample ID
2Perfbrmance Standard. Bold indicates the parameter was detected above the SOW Concentration
—: not analyzed
Data Qualifiers (refer to Appendix D for results of data validation)
J : Result is less than the RL but greater than or equal to the MDL and the concentration is an approximate value.
U : Indicates the analyte was analyzed for but not detected.
*: LCS or LCSD is outside acceptance limits.
E: Result exceeded calibration range.
J:\jobs\Projects\Anconic\Davenport\181101 Davenport 3rd Qtr 2018 Report\Tables\181115 3Q18 Table 5-2j(lsx
Page 1 of 3
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Table 4-5
Groundwater Sample Analytical Results - 2nd Semiannual Event 2018
Alcoa-Davenport Works
Sample ID1
SOW
Cone2
GM-10-180928-D
HNI-180926
HS(S)-180926
HX-180926
JI-180927
JS-180927
JX-180927
LBD-01U-180925 LNI-180927
LS(S)-180927
Samollna Date
9/28/18
9/26/18
9/26/18
9/26/18
9/27/18
9/27/18
9/27/18
9/25/18 ) 9/27/18
9/27/18
Volatlles (ug/L)
1,1,1-Trichloroethane
200
1 U
1 U
20 U
1 U
1 U
1 U
1 U
—
1 U
1 U
1,1,2,2-Tetrachloroethane
0.3
1 U
1 U
20 U
1 U
1 U
1 U
1 U
— I 1 U
1 U
11 2-Trichloroethane
5
1 U
1 U
20 U
1 U
1 U
1 U
1 U
— 1 u
1 U
1 1-Dichloroethane
140
0.51 J
1 U
5.6 J
1 U
1 U
1 U
1 U
- 1 u
1 U
1,1-Dichloroethene
7
1 U
1 U
20 U
1 U
1 U
1 U
1 U
— I 1 u
1 U
1,2-Dichlorobenzene
600
1 U
1 U*
20 U*
1 U*
1 U
1 U
1 U
— 1 u
1 U
1 2-Dichloroethane
5
1 U
1 U
20 U
1 U
1 U
1 U
1 U
— I 1 u
1 U
2-Butanone (MEK)
4000
10 U
10 U
200 U
10 U
10 U
10 U
10 U
—
10 U
10 U
Acetone
6300
10 U
10 U
200 U
10 U
10 U
10 U
10 U
—
10 U
10 U
Acrolein
3.5
20 U
20 U
400 U
20 U
20 U
20 U
20 U
—
20 U
20 U
Benzene
5
0.14 J
1 U
20 U
1 U
1.3
1 U
3.2
—
1 U
1 U
Bromoform
80
1 U
1 U
20 U
1 U
1 U
1 U
1 U
— I 1 u
1 U
Carbon disulfide
700
1 U
1 U
20 U
1 U
1 U
1 U
1 U
— I 1 u
1 U
Carbon tetrachloride
5
1 U
1 U
20 U
1 U
1 U
1 U
1 U
1 u
1 U
Chlorobenzene
100
1 U
1 U
20 U
1 U
1 U
1 U
1 U
— I 1 u
1 U
Chloroethane
60
14
1 U
20 U
1 U
1 U
1 U
1 U
— I 1 u
1 U
Chloroform
80
1 U
1 U
20 U
1 U
1 U
1 U
1 U
— 1 u
1 U
Chloromethane
30
1 U
1 U
20 U
1 U
1 U
1 U
1 U
— I 1 u
1 U
cis-1,2-Dichloroethene
70
2
5.1
470 E
1.3
1.4
0.21 J
0.31 J
— I 6.8
1 u
Dibromochloromethane
80
1 U
1 U
20 U
1 U
1 U
1 U
1 U
1 U
1 u
Ethvlbenzene
700
1 U
1 U
20 U
1 U
1 U
1 U
1 U
I
C
1 u
Methyl isobutyi ketone
560
10 u
10 U
200 U
10 U
10 U
10 U
10 U
l 10 u
10 u
Methylene Chloride
5
5 U
5 U
100 U
5 U
5 U
5 U
5 U
— 5 U
5 U
fetrachloroethene
5
1 U
1 U
390 E
1 U
1 U
1 U
1 U
— 1 u
1 U
Toluene
1000
0.29 J
1 U
20 U
1 U
1 U
1 U
1 U
— 1 u
1 U
trans-1,2-Dichloroethene
100
0.85 J
1 U
4.7 J
1 U
1 U
1 U
1 U
— 1 u
1 u
irans-1,3-Dichloropropene
1.8
1 U
1 U
20 U
1 U
1 U
1 U
1 U
— j iii
1 u
Trichloroethene
5
0.34 J
1 U
350 E
1 U
1 U
1 U
1 U
— I 1 u
1 u
Vinyl chloride
2
2
1
20 U
1 U
1.4
1 U
1 U
1 U
1 u
Xylenes, Total
10000
0.39 J
2 U
40 U
2 U
2 U
2 U
2 U
—
2 U
2 U
PCBs lua/U
Aroclor-1242
0.5
0.51 U
—
—
—
—
0.098 U
—
0.099 U
—
—
Aroclor-1248
0.5
5.2
—
—
—
—
0.072 J
—
0.089 J
—
—
Arodor-1254
0.5
0.51 U
—
—
—
—
0.098 U
—
0.099 U
—
—
J:\jobs\Projeds\Anconic\Davenport\181101 Davenport 3rd Qtr 2018 Report\Tables\181115 3Q18 Table 5-2jdsx
Page 2 of 3
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Table 4-5
Groundwater Sample Analytical Results - 2nd Semiannual Event 2018
Alcoa-Davenport Works
Sample ID1
SOW
NEA-011-180927
PA-14S-180926
PA-17S-180928
PA-17S-180928-D
WDS-5-180924
Samollna Date
Cone
9/27/18
9/26/18
9/28/18
9/28/18
9/24/18
voiatiies (ug/L)
1,1,1 -T richloroethane
200
1 U
1 U
10 U
10 U
1 U
1,1,2,2-Tetrachloroethane
0.3
1 U
1 U
10 U
10 U
1 U
1 1 2-Trichloroethane
5
1 u
1 U
10 U
10 U
1 U
1 1-Dichloroethane
140
21
0.56 J
11
10
1 U
1,1-Dichloroethene
7
6.6
1 U
4.6 J
4.8 J
1 U
1,2-Dichlorobenzene
600
1 U
1 U*
10 U
10 U
1 U*
1 2-Dichloroethane
5
1 U
1 U
10 U
10 U
1 U
2-Butanone (MEK)
4000
10 U
10 U
100 U
100 U
10 U
Acetone
6300
to U
10 U
100 U
100 U
10 U
Acrolein
3.5
20 U
20 U
200 U
200 U
20 U
Benzene
5
1 U
1 U
10 U
10 U
1 U
Bromoform
80
1 U
1 U
10 U
10 U
1 U
Carbon disulfide
700
1 U
1 U
10 U
10 U
1 U
Carbon tetrachloride
5
1 U
1 U
10 U
10 U
1 u
Chlorobenzene
100
1 U
1 U
10 U
10 u
1 u
Chloroethane
60
1 U
1 U
10 u
10 u
1 u
Chloroform
80
1 U
1 U
10 u
10 u
1 u
Chloromethane
30
1 U
1 U
10 u
10 u
1 u
cls-1,2-Dichloroethene
70
1 U
83
1400
1500
1.6
~ibromochloromethane
80
1 U
1 U
10 u
10 u
1 u
Ethvibenzene
700
1 U
1 U
10 u
10 u
1 u
Methyl isobutyl ketone
560
10 U
10 u
100 u
100 u
10 u
Methylene Chloride
5
5 U
5 U
50 U
50 U
5 U
retrachloroethene
5
1 U
7.1
3600
3900
1 u
Toluene
1000
1 U
1 U
10 u
10 u
1 u
jans-1,2-Dichloroethene
100
1 U
0.21 J
5.7 J
5.7 J
1 u
irans-1,3-DichloroproDene
1.8
1 U
1 U
10 U
10 U
1 u
rrichloroethene
5
1 U
7A
660
670
0.18 J
i/inyl chloride
2
1 U
0.37 J
6.2 J
7 J
1 u
Kvienes, Total
10000
2 U
2 U
20 U
20 U
2 U
p6bs (ua/L)
\roclor-1242
0.5
—
—
—
—
0.099 U
\roclor-1248
0.5
—
—
—
—
0.099 U
\rocior-1254
0.5
—
—
—
—
0.099 U
J:\jobs\Projecta\Arconic\Davenporft181101 Davenport 3rd Qtr2018 Report\Tables\181115 3Q18 Table 5-2jdsx
Page 3 of 3
-------
Table 4-6
Groundwater Sample Analytical Results - 1st Semiannual Event 2019
Alcoa-Davenport Works
Sample ID1
SOW
Cone2
ANS-190319
AS-190310
GM-04R-190321
GM-06R-190322
GM-06R-190322-F
GM-09-190322
GM-10-190322
GM-10-190322-D
HNH 90321
| Samnllna Date
3/19/19
3/19/19
3/21/19
3/22/19
3/22/19
3/22/19
3/22/19
3/22/19
3/21/19
jtvolatlles (ug/L)
[1,1,1-Trichbroethane
200
—
—
—
—
—
—
—
1 U
[1,1,2,2-Tetrachbroethane
0.3
—
—
—
—
1 U
|1,1,2-Trich loraethane
5
—
—
—
—
—
—
—
1 U
11,1-Dichbroethane
140 1
—
—
—
—
—
—
1 U
|1,1-Dichloroethene
7
—
—
—
—
—
_
1 U
|1,2-Dich lorobenzene
600
—
—
mv
—
_
1 U
1,2-Dichbroethane
S
—
—
—
—
—
—
—
_
1 U
12-Butanone (MEK1
4000
—
—
—
—
_
—
—
10 u
[Acetone
6300
—
—
—
—
—
10 u
Acrolein
3.5
—
—
—
—
—
—
20 U
penzene
S
—
—
—
—
—
—
—
—
1 U
|Bromofomn
60
—
—
_
_
—
1 U
[Carbon disulfide
700
—
—
—
—
—
—
—
—
1 U
(Carbon tetrachloride
S
—
—
—
—
—
—
—
—
1 U
|Ch lorobenzene
100
—
_
—
—
1 u
Jchloroethane
60
—
—
—
—
—
1 u
jphlorofbrm
80
—
—
—
—
—
—
—
—
1 u
IChioromethane
30
—
—
—
—
—
—
1 u
lcis-1,2-Dich loreethene
70
—
—
—
—
—
—
—
9.2
|Dibromochbromethane
80
—
—
—
—
—
1 U
Ethvlbenzene
700
—
—
—
—
—
—
1 U
iMethyi isobutyl ketone
560
__
—
—
—
10 U
Methylene Chloride
5
—
—
—
—
—
_
5 U
ftetrachloroethene
5
—
—
—
—
—
—
—
1 U
'Toluene
1000
_
—
__
_
1 U
llrans-1,2-Dich loroethene
100
—
—
—
—
—
—
—
—
1 U
|trans-1,3-Dichbropropene
1.8
—
—
—
—
—
—
_
1 U
[Tiichbraethene
5
—.
—
—
—
—
1 U
K/inyl chloride
2
—
—
—
—
—
2
Ixvlenes, Total
10000
—
—
—
—
_
2 U
fpCB* (ug/L)
lArodor-1242
0.5
0.96 U
o.i is
0.47
0.097 U
0.096 U
0.1 u
1.7
1.7
1
8
1
_
11
2.2
0.099 U
1.3
0.096 U
14
0.49 U
0.5 U
_
jftrodor-1254
0.5
0.86 U
0.1 U
0.099 U
0.097 U
0.096 U
0.1 u
0.49 U
0.5 LJ
—
1Filtered samples have an "F" at the end of the sample ID; dupicate samples have a "D* at the end of the sample ID
Performance Standard. Bold indicates the parameter was detected above the SOW Concentration
—: not analyzed
Data OuaHiers (refer to Appendix D for results of data vaidation)
B: Compound was found in the blank and sample.
J : Result is less than the RL but greater than or equal to the MDL and the concentration is an approximate value.
II: Indicates the analyte was analyzed for but not detected.
J:\Projects\Arconic\Davenport\190510 Davenport 1st Qtr 2019 Report\Tables\1905101Q19 Table 5-2.xtex
Page 1 of 2
-------
Table 4-6
Groundwater Sample Analytical Results - 1st Semiannual Event 2019
Alcoa-Davenport Works
Sample ID1
SOW
HS(S)-190321
HX-190321
LNI-190319
LS(S>190319
PA-14S-190321
PA-17S-190321
PA-17S-190321-O
Sampling Date
Cone1
3/21/19
3/21/19
3/19/19
3/19/19
3/21/19
3/21/19
3/21/19
tfobtBea (ug/Ll
200
2U
1 U
1 U
1 U
1 U
10 U
10 U
1,1,2 2-Tetrachbroethane
0.3
2 U
1 U
1 U
1 U
1 U
10 U
10 U
1.1 2-Trichloroethane
5
2 U
1 U
1 U
1 U
1 U
10 U
10 U
1, 1-Dichbnoethane
140
9.9
1 U
1 U
1 U
0.37 J
7.9 J
9.1 J
7
3.3
1 U
1 U
1 U
1 U
3 J
3.4 J
600
2 U
1 U
1 U
1 U
1 U
10 U
10 U
1,2-Dichbroethane
5
2 U
1 U
1 U
1 U
1 U
10 U
10 u
4000
20 U
10 U
10 U
10 U
10 U
100 U
100 u
6300
20 U
10 U
10 U
10 U
10 U
100 U
100 u
3.5
40 U
20 U
20 U
20 U
20 U
200 U
200 U
5
2 U
1 U
1 U
1 U
1 U
10 U
10 u
80
2 U
1 U
1 U
1 U
1 U
10 U
10 u
700
2 U
1 U
1 U
1 U
1 U
10 U
10 II
5
2 U
1 U
1 U
1 U
1 U
10 U
10 u
Chbrobenzene
100
2 U
1 U
1 U
1 U
1 U
10 U
10 u
60
2 U
1 U
1 U
1 U
1 U
10 U
10 u
80
2 II
1 U
1 U
1 U
1 U
10 u
10 u
30
2 U
1 U
1 U
1 U
1 U
10 u
10 u
cis-1 2-Dichbroethene
70
660
1.3
r b
1 U
50
790
900
Dibromochbromethane
80
2 U
1 U
1 u
1 u
1 U
10 u
10 II
Ethybenzene
700
2 U
1 U
1 u
1 u
1 U
10 u
10 u
560
20 U
10 U
10 u
10 u
10 U
100 u
100 u
Methylene Chbride
5
10 U
5 U
5 U
5 U
5 U
50 U
50 U
Tetrachbroethene
5
510
0.21 J
1 u
1 U
6.6
1900
2100
1000
2 U
1 U
1 u
0.17 J
1 U
10 u
10 II
trans-1 2-Dichbroethene
100
3.4
1 U
1 u
1 U
1 U
5.6 J
5.9 J
trans-1 3-Dichbropropene
1.8
2 U
1 U
1 u
1 U
1 u
10 U
10 U
5
460 B
0.23 J B
0.25 J B
0.16 J B
8 J B
410 B
460 B
2
0.43 J
1 U
1 u
1 U
0.3 J
7 J
8.2 J
10000
4 U
2 U
2 U
2 U
2 U
20 U
20 Li
PCBs (uaJLl
0.5
_
—
—
—
—
0.5
_
—
—
—
—
ftrodor-1254
0.5
=
—
—
-
—
—
~ "
J:\Projects\ArconidDavenpor1M 9051Q Davenport 1st Qtr 2019 Repart\Tables\1905101Q19 Table 5-2jdsx
Page 2 of 2
-------
Table 4-7
Groundwater Sample Analytical Results - 2nd Semiannual Event 2019
Alcoa-Davenport Works
Sample E>1
SOW
Cone2
AD-190924
AI-190924
AN S-191001
ANS-191001-F
AS-190924
EDS-2-190925
GM-04R-190924
GM-06R-190924
GM-09-190924
Samollna Date
9/24/19
9/24/19
10/1/19
10/1/19
9/24/19
9/25/19
9/24/19
9/24/19
9/24/19
Volatllea(ug/L)
1,1,1-Trichk>roethane
200
—
—
1 U
—
1 U
1 U
—
1 U
1 U
1 1,2,2-Tetrachloroethane
0.3
—
—
1 U
—
1 U
1 U
—
1 U
1 U
1 1 2-Trichloroethane
5
—
—
1 U
—
1 U
1 U
—
1 U
1 U
1,1-Dichk>roethane
140
0.21 J
1 U
1 U
1 U
1 U
11-Dichloroethene
7
—
—
1 U
—
1 U
1 U
—
1 U
1 U
1 2-Dichlorobenzene
600
—
—
1 U
—
1 U
1 U
—
1 U
1 U
1,2-Dichloraethane
5
1 U
1 U
1 U
1 U
1 U
2-Butanone (MEK)
4000
—
—,
10 U
_
10 U
10 U
—
10 U
10 U
Acetone
6300
—
—
10 U
—
10 U
10 U
—
13
10 U
Acrolein
3.5
—
—
20 U
—
20 U
20 U
—
20 U
20 U
Benzene
5
—
—
0.39 J
—
1 U
0.22 J
—
1 U
1 U
BromofOrm
80
1 U
—
1 U
1 U
—
1 U
1 U
Carbon disulfide
700
—
—
1 U
—
1 U
1 U
—
1 U
1 U
Carbon tetrachloride
5
—
—
1 U
—
1 U
1 u
—
1 U
1 U
Chlorobenzene
100
—
—
1 U
—
1 U
1 u
—
1 U
1 U
Chloroethane
60
1 II
1 U
1 u
1 U
1 U
Chloroform
80
—
—
1 U
—
1 U
1 u
—
1 U
1 U
Chloromethane
30
—
—
1 U
—
1 U
1 u
—
1 U
1 U
~s-1,2-Dichlonoethene
70
—
—
39
—
1.6
3.3
—
2.8
1 U
~ibromochloromethane
80
—
—
1 U
—
1 U
1 U
—
1 U
1 U
Ethybenzene
700
—
—
1 U
—
1 U
1 U
—
1 U
1 U
Methyl isobutyl ketone
560
—
—
10 U
—
10 U
10 U
—
10 U
10 u
Methylene Chloride
5
—
—
5 U
—
5 U
5 U
—
5 U
5 U
Tetrachloroethene
5
1 U
0.29 J
1 U
1 U
1 U
Toluene
1000
—
—
0.15 J
—
1 U
1 U
—
1 U
1 U
trans-1,2-Dichloroethene
100
—
—
0.25 J
—
1 U
0.2 J
—
1 U
1 U
trans-1 3-Dichloropropene
1.8
—
—
1 U
—
1 U
1 U
—
1 U
1 U
Trichloroethene
5
—
—
1 U
—
0.16 J
0.14 J
—
1 U
1 U
Vinyl chloride
2
—
—
BjG
—
1 U
11
—
0.39 J
1 u
Xylenes, Total
10000
—
—
2 U
—
2 U
2 U
—
2 U
2 U
PCBs (ua/L)
Aroclor-1242
0.5
0.097 U
0.097 U
0.99 U
0.24
0.54 U
—
0.098 U
0.11 U
0.1 U
Arock>M248
0.5
0.097 U
0.097 U
14
0.098 U
5.4
—
0.55
1.1
1J
Arock>M254
0.5
0.097 U
0.097 U
0.99 U
0.098 U
0.54 U
—
0.098 U
0.11 u
0.1 u
1 Filtered samples have an "F" at the end of the sample ID; duplicate samples have a "D* at the end of the sample ID
Performance Standard. Bold indicates the parameter was detected above the SOW Concentration
—: not analyzed
Data Qualifiers (refer to Appendix D for results of data validation)
B: Compound was found in the blank and sample.
J : Result is less than the RL but greater than or equal to the MDL and the concentration is an approximate value.
U : Indicates the analyte was analyzed fbr but not detected.
J:\Projects\Arconic\DavenportYI 91113 Davenport 3rd Qtr Report\191115 3Q19 Table 5-2jdsx
Page 1 of 3
-------
Table 4-7
Groundwater Sample Analytical Results - 2nd Semiannual Event 2019
Alcoa-Davenport Works
Sample ID1
SOW
Cone2
GM-10-191001 GM-10-191001-D
HNM 90926
HS(S)-190926
HX-190926
JI-190926
JS-190926
JS-190926-F
JX-190926
Samnllna Date
10/1/19 10/1/19
9/26/19
9/26/19
9/26/19
9/26/19
9/26/19
9/26/19
9/26/19
VbhtflM (ugJL)
1.1.1 -Trichloroethane
200
1 U
1 U
1 U
2 U
1 U
1 U
1 U
—
1 U
1 1 2 2-Tetrachloroethane
0.3
1 U
1 U
1 U
2 U
1 U
1 U
1 U
—
1 u
1.1 2-Trichioroethane
5
1 U
1 U
1 U
2 U
1 u
1 U
1 u
—
1 u
11-Dichloroethane
140
1 U
1 U
1 U
7.5
1 u
1 U
1 u
—
1 u
11-Dichloroethene
7
1 U
1 U
1 U
1.5 J
1 u
1 U
1 u
—
1 u
1,2-Dichlorobenzene
600
1 U
1 U
1 U
2 U
1 u
1 U
1 u
—
1 u
1,2-Dichloroethane
5
1 U
1 U
1 U
2 U
1 u
1 U
1 u
—
0.33 J
2-Butanone (MEK)
4000
10 U
10 U
10 U
20 U
10 u
10 U
10 u
—
10 U
Acetone
6300
5.6 J
10 U
10 U
20 U
10 u
10 U
9.7 J
—
10 U
Acrolein
3.5
20 U
20 U
20 U
40 U
20 U
20 U
20 U
—
20 U
Benzene
5
1 U
1 U
1 u
2 U
1 u
1.1
1 u
—
2.3
Bromofbim
80
1 U
1 U
1 u
2 U
1 u
1 U
1 u
—
1 U
Carbon disulfide
700
1 U
1 U
1 u
2 U
1 u
1 U
1 u
—
1 U
Carbon tetrachloride
5
1 U
1 U
1 u
2 U
1 u
1 U
1 u
—
1 u
Chlorobenzene
100
1 U
1 U
1 u
2 U
1 u
1 U
1 u
—
1 u
Chloroethane
60
0.96 J
0.98 J
1 u
2 U
1 u
1 U
1 u
—
1 u
Chloroform
80
1 U
1 U
1 u
2 U
1 u
1 U
1 u
—
1 u
Chloromethane
30
1 U
1 U
1 u
2 U
1 u
1 U
1 u
—
1 u
cis-1,2-Dichloroethene
70
2.3
2.3
9.5
560
1.2
2.9
0.39 J
—
0.4 J
Dibromochloromethane
80
1 U
1 U
1 u
2 U
1 u
1 U
1 u
—
1 u
Ethvfeenzene
700
1 U
1 U
1 u
2 U
1 u
1 U
1 u
—
1 u
Methyl isobutyl ketone
560
10 U
10 u
10 u
20 U
10 u
10 U
10 u
—
10 u
Methylene Chloride
5
5 U
5 U
5 U
10 U
5 U
5 U
5 U
—
5 U
Tetrachloroethene
5
0.16 J
0.17 J
0.68 J
300
1 u
1 U
1 u
—
1 u
Toluene
1000
0.14 J
0.15 J
1 u
2 U
1 u
1 U
1 u
—
1 u
trans-1,2-Dichloroethene
100
1 U
1 U
1 u
18
1 u
1 U
1 u
—
1 u
trans-1,3-Dichloropropene
1.8
1 U
1 U
1 u
2 U
1 u
1 U
1 u
—
1 u
Trichloroethene
5
0.33 J
0.32 J
1
310
0.1 J
0.24 J
1 u
—
1 u
Vinyl chloride
2
1 U
1 U
1.1
1.5 J
1 u
1.4
1 u
—
1 u
Xylenes, Total
10000
0.18 J
0.18 J
2 U
4 U
2 U
2 U
2 U
—
2 U
PCBa (uoJL)
Arock)M242
0.5
0.49 U
0.48 U
—
0.1 U
0.1 u
—
Aroclor-1248
0.5
6.9
4J
—
—
—
—
0.89
0.1 u
—
Aroclor-1254
0.5
0.49 U
0.48 U
—
—
—
—
0.1 u
0.1 u
—
1 Filtered samples have an "F" at the end of the sample ID; duplicate samples have a "D* at the end of the sample ID
Performance Standard. Bold indicates the parameter was detected above the SOW Concentration
—: not analyzed
Data Qualfiers (refer to Appendix D for results of data validation)
B: Compound was found in the blank and sample.
J : Result is less than the RL but greater than or equal to the MDL and the concentration is an approximate value.
U : Indicates the analyte was analyzed for but not detected.
J:\Projects\Arconic\Davenport\191113 Davenport 3rd Qtr ReportVI 91115 3Q19 Table 5-2 jdsx
Page 2 of 3
-------
Table 4-7
Groundwater Sample Analytical Results - 2nd Semiannual Event 2019
Alcoa-Davenport Works
Sample ID1
SOW
Cone3
LBD-01U-190824
LNI-190925
LS(S)-190925
NEAf011-190925
PA-14S-190926
PA-17S-191001
PA-17S-191001-D
WDS-5-190924
Samolna Date
9/24/19
9/25/19
9/25/19
9/25/19
9/26/19
10/1/19
10/1/19
9/24/19
Vols tiles (ug/L)
1.1,1 -Trichloroethane
200
—
1 U
1 U
1 U
1 U
10 U
10 U
1 U
1,1 2,2-Tetrachioroethane
0.3
—
1 U
1 U
1 U
1 U
10 U
10 U
1 U
1.1 2-T richloroethane
5
—
1 U
1 U
1 U
1 U
10 U
10 U
1 U
1,1-Dichloroethane
140
—
1 U
1 U
18
0.86 J
14
13
1 U
11-Dichloroethene
7
—
1 U
1 U
5.7
0.42 J
7.1 J
6.6 J
1 U
1,2-Dichlorobenzene
600
—
1 U
1 U
1 U
1 U
10 U
10 U
1 U
1,2-Dichloroethane
S
—
1 U
1 U
1 U
1 U
10 u
10 U
1 U
2-Butanone (MEK)
4000
—
10 U
10 U
10 U
10 U
100 u
100 U
10 U
Acetone
6300
—
10 U
10 U
10 U
5.6 J
100 u
100 U
10 U
Acrolein
3.5
—
20 U
20 U
20 U
20 U
200 U
200 U
20 U
Benzene
S
—
1 U
1 U
1 U
1 U
10 u
10 U
1 U
Bromotorm
80
—
1 U
1 U
1 U
1 U
10 u
10 U
1 U
Carbon disulfide
700
—
1 U
1 U
1 U
1 U
10 u
10 U
1 U
Carbon tetrachloride
S
—
1 U
1 U
1 U
1 U
10 u
10 U
1 U
Chloro benzene
100
—
1 U
1 U
1 U
1 U
10 u
10 U
1 U
Chloroethane
60
—
1 U
1 U
1 U
1 U
10 u
10 U
1 U
Chloroform
80
—
1 u
1 U
1 U
1 U
1.3 J B
10 u
1 U
Chloromethane
30
—
1 u
1 U
1 U
1 U
10 u
10 u
1 U
cis-1,2-Dichloroethene
70
—
5.8
1 U
1 U
110
1900
1800
0.97 J
Dibromochloromethane
80
—
1 U
1 U
1 U
1 u
10 u
10 u
1 U
Ethvlbenzene
700
—
1 U
1 U
1 U
1 u
10 u
10 u
1 U
Methyl isobutyl ketone
560
—
10 u
10 U
10 U
10 u
100 u
100 u
10 U
Methylene Chloride
5
—
5 U
5 U
5 U
5 U
50 U
50 U
5 U
Tetrachloroethene
5
—
1 U
1 U
1 U
14
3400
3200
1 U
Toluene
1000
—
1 U
1 U
1 U
1 U
10 u
10 u
1 U
trans-1,2-Dichloroethene
100
—
1 U
1 U
1 U
0.24 J
11
9.1 J
1 U
trans-1,34ichloropropene
1.8
—
1 U
1 U
1 U
1 U
10 u
10 U
1 U
Trichloroethene
5
—
1 U
1 U
1 U
15
790
770
1 U
Vinyl chloride
2
—
1 U
1 U
1 U
1.6
12
11
1 U
Xvlenes, Total
10000
—
2 U
2 U
2 U
2 U
20 U
20 U
2 U
PCBa (ua/L)
Aroclor-1242
0.5
0.11 u
—
—
—
_
_
_
0.1 U
Aroclor-1248
0.5
0.11 u
—
—
—
—
—
—
0.1 U
Aroclor-1254
0.5
0.11 u
—
—
—
—
—
—
0.1 U
1Filtered samples have an "F" at the end of the sample ID; duplicate samples have a "D* at the end of the sample ID
'Performance Standard. Bold indicates the parameter was detected above the SOW Concentration
—: not analyzed
Data Qualfiers (refer to Appendix D for results of data validation)
B: Compound was tound in the blank and sample.
J: Result is less than the RL but greater than or equal to the MDL and the concentration is an approximate value.
U : Indicates the analyte was analyzed tor but not detected.
J:\Projects\Arcanic\Davenpart\191113 Davenport 3rd Qtr ReportM 91115 3Q19 Table 5-2jdsx
Page 3 of 3
-------
Table 4-8
Groundwater Sample Analytical Results - 1st Semiannual Event 2020
Alcoa-Davenport Works
| Sample ID1
SOW
Cone2
ANS-200323
ANS-200323-F
AS-200323
GM-04 R-200317
GM-06R-200317
GM-09-200323
GM-10-200326
GM-10-200326-D
HNl-200325
f| Semolina Date
3/23/20
3/23/20
3/23/20
3/17/20
3/17/20
3/23/20
3/26/20
3/26/20
3/25/20
Ijvonuiea (ug/Li
11,1,1 -T richloroethane
200
—
—
—
—
—
—
—
—
1 U
11,1,2,2-1 etrachloroethane
0.3
—
—
—
—
—
—
—
—
1 U
[1,1,2-T richloroethane
5
—
—
—
—
—
—
—
—
1 U
|1,1-Dichloroethane
140
—
—
—
—
—
—
—
—
1 U
|1,1-Dichloroethene
7
—
—
—
—
—
—
—
1 U
11,2-Dichlorobenzene
600
—
—
—
—
—
—
—
—
1 U
|1,2-Dichloroethane
5
—
—
—
—
—
—
—
—
1 U
[2-Bulanone (MEK)
4000
—
—
—
—
—
—
—
—
10 U
[Acetone
6300
—
—
—
—
—
—
—
—
10 U
{Acrolein
3.5
—
—
—
—
—
—
20 U
|Benzene
5
—
—
—
—
—
—
—
—
1 U
jBromoform
60
—
—
—
—
—
—
—
—
1 U
(Carbon disulfide
700
—
—
—
—
—
—»
1 U
[Carbon tetrachloride
™"B" '
—
—
—
—
—
—
—
—
1 U
jchlorobenzene
100
—
—
—
—
—
—
—
1 U
bhloroethane
60
—
—
—
—
—
—
—
—
1 U
Ichloroform
86
—
—
—
—
—
—
—
—
1 U
IChloromethane
30
—
—
—
—
—
—
1 U
|ci&-1,2-Dichloroethene
70
—
—
—
—
—
—
—
—
8.2
bibromochloromethane
80
—
—
—
—
—
—
—
—
1 U
pthyfcerizene
700
—
—
1 U
Methyl isobutvl ketone
560
—
—
—
—
—
—
—
—
10 U
buiethvlene Chloride
5
—
—
—
—
—
—
—
—
5 U
h"etrachloroethene
5
—
—
—
—
—
—
—
1 U
(Toluene
1000
—
—
—
—
—
—
—
—
1 U
|rans-1,2-Dichloroethene
too
—
—
1 U
jtrans-1,3-Dichloropropene
1.8
—
—
—
—
—
—
—
—
1 U
[frichloroethene
5
—
—
—
—
—
—
—
—
1 U
Vinyl chloride
2
—
—
—
—
—
—
1.3
{xylenes, Total
10000
—
—
—
—
—
—
—
—
2 U
jpCBs (uaJLl
krodor-1242
0.5
1.9 U
0.11 U
0.1 u
0.54 U
0.21 U
0.098 U
0.51 U
0.5 U
—
kroclor-1248
0.5
46
2.6
2i
0.68
0.93
2J2
10
7.8
—
hrodor-1254
0.5
1.9 U
0.11 U
0.1 u
0.54 U
0.21 U
0.098 U
0.51 U
0.5 U
—
1Filtered samples have an "F" at the end of the sample ID; duplicate samples have a "D" at the end of the sample ID
'Performance Standard. Bold indicates the parameter was detected above the SOW Concentration
—: not analyzed
Data Qualifiers (refer to Appendix D for results of data validation)
J : Result is less than the RL but greater than or equal to the MDL and the concentration is an approximate value.
U : Indicates the analyte was analyzed for but not detected.
Page 1 of 2
-------
Table 4-8
Groundwater Sample Analytical Results - 1st Semiannual Event 2020
Alcoa-Davenport Works
Sample ID1
SOW
Cone1
HS(S)-200325
HX-200325
LNI-200324
LS(S)-200324
PA-14S-200325
PA-17S-2Q0325
PA-17S-20Q325-D
Samnlna Date
3/25/20
3/25/20
3/24/20
3/24/20
3/25/20
3/25/20
3/25/20
Volatlles (ug/L)
1,1,1-Trichloroethane
200
2 U
1 U
1 U
1 U
1 U
10 U
10 U
1,1,2,2-Tetrachloroethane
0.3
2 U
1 U
1 U
1 U
1 U
10 U
10 U
11,2-Trichloroethane
5
2 U
1 U
1 U
1 U
1 U
10 U
10 U
1,1-Dichloroethane
140
8.2
1 U
1 U
1 U
0.28 J
11
12
11-Dichloroethene
7
2 U
1 U
1 U
1 U
1 U
5.4 J
5.8 J
1,2-Dichk>robenzene
600
2 U
1 U
1 U
1 U
1 U
10 U
10 U
1 2-Dichloroethane
5
2 U
1 U
1 U
1 U
1 U
10 U
10 U
2-Butanone (MEK)
4000
20 U
10 U
10 U
10 U
10 U
100 U
100 U
Acetone
6300
20 U
10 U
10 U
10 U
10 U
100 U
100 U
Acrolein
3.5
40 U
20 U
20 U
20 U
20 U
200 U
200 U
Benzene
5
2 U
1 U
1 U
1 U
1 U
10 U
10 U
Bromoform
80
2 U
1 U
1 U
1 U
1 U
10 U
10 U
Carbon disulfide
700
2 U
1 U
1 U
1 U
1 U
10 U
10 U
Carbon tetrachloride
5
2 U
1 U
1 U
1 U
1 U
10 U
10 U
Chlorobenzene
100
2 U
1 U
1 U
1 U
1 U
10 U
10 U
Chloroethane
60
2 U
1 U
1 U
1 U
1 U
10 u
10 U
Chloroform
80
2 U
1 U
1 U
1 U
0.24 J
10 u
10 u
Chloromethane
30
2 U
1 U
1 U
1 U
1 U
10 u
10 u
|cts-1,2-Dichloroethene
70
540
0.96 J
7
1 U
44
1600
1600
pibromochloromethane
80
2 U
1 U
1 U
1 U
1 U
10 u
10 u
Ethylbenzene
700
2 U
1 U
1 U
1 U
1 U
10 u
10 u
Methyl isobutyl ketone
560
20 U
10 U
10 u
10 U
10 U
100 u
100 u
Methylene Chloride
5
10 U
5 U
5 U
5 U
5 U
50 U
50 U
Tetrachloroethene
5
340
1 U
1 U
1 U
4.8
2900
2800
Toluene
1000
2 U
1 U
1 U
1 U
1 U
10 u
10 u
ttrans-1,2-Dichloroethene
100
71
1 U
1 U
1 U
1 U
8.4 J
7 3. J
trans-1,3-Dichloropropene
1.8
2 U
1 U
1 U
1 U
1 U
10 U
10 u
Trichloroethene
5
400
1 U
1 U
1 U
8£
750
760
Vinyl chloride
2
2 U
1 U
1 U
1 U
1 U
11
11
Xylenes, Total
10000
4 U
2 U
2 U
2 U
2 U
20 U
20 U
PCBs fuafl.)
Aroclor-1242
0.5
—
—
—
—
—
—
—
Aroclon-1248
0.5
—
—
—
—
—
—
—
Aroclor-1254
0.5
—
—
—
—
—
—
—
Page 2 of 2
-------
Table 4-9
Groundwater Sample Analytical Results - 2nd Semiannual Event 2020
Alcoa-Davenport Works
Sampb D1
SOW
Cone2
AD-200819
AI-200B18
ANS-200B18
AS-200818
AX-200819
ED-200820
EDS-2-200819
EI-200828
ES-200820
Samolna Date
8/19/20
8/18/20
8/18/20
8/18/20
8/19/20
8/20/20
8/19/20
8/28/20 :
8/20/20
i[^i11 'i
1,1,1-Trichloraethane
200
1 U
1 U
1 U
1 U
1 U
1 U
1 U
4 U
1 U
1,1,2,2-Tetrachloroethane
0.3
1 U
1 U
1 U
1 U
1 U
1 U
1 U
4 U
1 U
1,1,2-T richbroethane
S
1 U
1 U
1 U
1 U
1 U
1 U
1 U
4 U
1 U
1,1-Dichbroethane
140
1 U
1 U
1 U
1 U
1 U
1 U
1 U
4 U
1 U
1,1-Dichbroethene
7
1 U
1 U
1 U
1 U
1 U
1 U
1 U
4 U
1 U
1,2-Dichbrobenzene
600
1 U
1 U
1 U
1 U
1 U
1 U
1 U
4 U
1 U
1,2-Dichloroethane
5
1 U
1 U
1 U
1 U
1 U
1 U
1 U
4 U
1 U
2-Butanone (MEK)
4000
10 U
10 U
10 U
10 U
10 U
10 U
10 U
40 U
10 U
Acetone
6300
10 U
10 U
11
10 U
10 U
10 U
10 U
40 U
10 U
Acrolein
3.5
20 U
20 U
20 U
20 U
20 U
20 U
20 U
80 U
20 U
Benzene
S
1 U
1 U
0.52 J
1 U
1 U
1 U
1 U
700
1 U
Bromoform
80
1 U
1 U
1 U
1 U
1 U
1 U
1 U
4 U
1 U
Cartoon disulfide
700
1 U
1 U
1 U
1 U
1 U
1 U
1 U
4 U
1 U
Cartoon tetrachloride
5
1 U
1 U
1 U
1 U
1 U
1 U
1 U
4 U
1 U
Chlorobenzene
100
1 U
1 U
1 U
1 U
1 U
1 U
1 U
4 U
1 U
Chloroethane
60
1 U
1 U
1 U
1 U
1 U
1 U
1 U
4 U
1 U
Chloroform
80
1 U
1 U
1 U
1 U
1 U
1 U
1 U
4 U
1 U
Chloromethane
30
1 U
1 U
1 U
1 U
1 U
1 U
1 U
4 U
1 U
cis-1,2-Dichbroethene
70
1 U
1 U
3.4
3.6
1 u
1 U
1.8
4 U
1 U
Dibromochloromethane
80
1 U
1 u
1 U
1 U
1 u
1 u
1 U
4 U I
1 U
Ethybenzene
700
1 u
1 u
1 U
1 U
1 u
1 u
1 U
5.1
1 U
Methyl isobutyl ketone
560
10 u
10 u
10 U
10 u
10 u
10 u
10 U
40 U I
10 u
Methylene Chbride
5
5 U
5 U
5 U
5 U
5 U
5 U
5 U
20 U
5 U
Tetrachbroethene
5
1 U
1 U
1 U
1 U
1 u
1 u
1 U
4 U
1 U
Toluene
1000 II 1 U
1 u
1 U
1 U
1 u
1 u
1 U
18
1 U
trans-1,2-Dichbroethene
100
1 U
1 u
1 U
1 u
1 u
1 u
1 U
4 U
1 U
trane-1,3-Dichloropropene
1.8
1 U
1 u
1 U
1 u
1 u
1 u
1 U
4 U
1 U
Trichbraethene
5
1 U
1 u
1 U
1 u
1 u
1 u
1 U
4 U
1 U
Vinyl chbride
2
1 u
1 u
2.7
0.64 J
1 u
1 u
2.6
4 U
1 u
Xylenes, Total
10000
2 U
2 U
2 U
2 U
2 U
2 U
2 U
36
2 U
Semlvolatlles (ug/L)
Acenaphthene
420
0.2 U
0.2 U
0.B8 U
0.19 U
0.19 U
0.2 U
0.21 U
1.5
0.21 U
Anthracene
2100
0.2 U
0.2 U
0.B8 U
0.19 U
0.19 U
0.2 U
0.21 U
0.2 U
0.21 U
Benzfalanthracene
0.24
0.2 U
0.2 U
0.B8 U
0.19 U
0.19 U
0.2 U
0.21 U
0.2 U
0.21 U
Benzo[a]pyrene
0.2
0.2 U
aj2 u
0.B8 U
0.19 U
0.19 U
0.2 U
0.21 U
0.2 U
0.21 U
Benzo[b]fluoranthene
0.24
0.2 U
0.2 U
0.B8 U
0.19 U
0.19 U
0.2 U
0.21 U
0.2 U
0.21 U
Benzo[klfluoranthene
2A
0.2 U
0.2 U
0.B8 U
0.19 U
0.19 U
0.2 U
0.21 U
0.2 U [
0.21 U
Chrvsene
24
0.2 U
0.2 U
0.B8 U
0.19 U
0.19 U
0.2 U
0.21 U
0.2 U I
0.21 U
Dibenzfa, hjanthracene
0.024
0.2 U
0.2 U
0.B8 U
0.19 U
0.19 U
0.2 U
0.21 U
0.2 U
0.21 U
Di-n-butyl phthalate
700
5.1 U
5 U
22 U
4.8 U
4.8 U
5.1 U
5.2 U
5.1 U
5.2 U
Fluoranthene
2B0
oa u
02 U
0.B8 U
0.19 U
0.19 U
oa u
0.21 U
0.2 U
0.21 U
Fborene
2B0
0.2 U
0.2 U |
0.B8 U
0.19 U j
0.19 U j
0.2 U
0.21 U j
1.4
0.21 U
Pagel of 10
-------
Table 4-9
Groundwater Sample Analytical Results - 2nd Semiannual Event 2020
Alcoa-Davenport Works
Sample D1
SOW
Cone1
AD-200B18
AI-200B18
ANS-200818
AS-200818
AX-200819
ED-200820
EDS-2-200816
EI-200828
ES-200820
Samolna Date
8/19/20
8/18/20
8/18/20
8/18/20
8/19/20
8/20/20
8/19/20
8/28/20
8/20/20
lndeno[1,2,3-cdJpyrene
0.24
0.2 U
0.2 U
0.88 U
0.1 S U
0.1 S U
0.2 U
0.21 U
0.2 U
0.21 U
NaDhthalene
100
0.2 U
0.2 U
0.88 U
0.1 S U
0.1 S U
0.2 U
0.21 U
0.49
0.21 U
Phenol
2000
1 U
0.99 U
4.4 U
0.96 U
0.95 U
1 U
1 U
0.59 J
1 U
Pyrene
210
0.2 U
0.2 U
0.88 U
o.i a u
0.19 U
0.2 U
0.21 U
0.2 U
0.21 U
PCBa (ug/L)
Aroclor-1242
0.5
0.1 U
0.1 U
1 U
0.5 U
0.098 U
0.1 U
0.11 U
0.1 U
0.11 U
Arocbr-1248
Of II 0.1 U
0.1 U
9.5
14
0.098 U
0.1 U
0.11 U
0.1 U
0.11 U
Aroclor-1254
0.5
0.1 U
0.1 U
1 U
0.5 U
0.098 U
0.1 U
0.11 U
0.1 U
0.11 U
Metals (ug/L)
Aluminum
7000
73
41 J
68
50 U
50 U
50 U
93
50 U
50 U
Arsenic
10
1.2 J
5 U
7.4
4.9 J
5 U
5 U
5.6
5 U
5 U
Barium
2000
220
170
1600
120
82
73
140
170
140
Beryllium
4
1 U
1 U
1 U
1 U
1 U
1 U
1 U
1 U
1 U
Cadmium
S
1 U
1 U
1 U
1 U
1 U
1 U
1 U
1 U
1 U
Chromium
100
1.5 J
2 U
2 U
2 U
2 U
2 U
2 U
2 U
2 U
Cobalt
140
2.1
0.2 J
0.41 J
0.29 J
0.19 J
0.21 J
4.9
1 U
2
CoDDer
1300
27
2 U
2 U
13
2 U
2 U
2 U
2 U
2 U
Iron
4000
34000 B
2800
10000
7100
2100 B
5600 B
1100 B
880
660 B
Lead
15
0.82 J B
1 U
1 u
10
0.54 J B
1 U
0.68 J B
1 U
1 U
Manganese
300
11
72
1100
1000
25
15
3500
19
190
Mercury
2
0.2 U
0.2 H II
0.2 H II
0.2 H II
0.2 U
0.2 U
0.2 U
0.2 U
0.2 U
Nickel
100
25
2 U
2
2 U
2 U
2 U
11
2 U
4.7
Selenium
50
5 U
5 U
5 U
5 U
5 U
5 U
5 U
5 U
5 U
Silver
100
1 U
1 U
1 U
1 U
1 U
1 U
1 U
1 U
1 U
Thallium
0.5
1 U
1 U
1 U
1 U
1 U
1 U
1 U
1 U
1 U
Vanadium
7
5 U
5 U
5 U
1.6 J
5 U
5 U
5 U
5 U
5 U
Zinc
2000
100
20 U
20 U
20 U
63
56
20 U
20 U
20 U
wet Chemistry (ua/L)
Cvanide Total
200
10 HU
10 U
10 U
10 U
10 HU
10 HU
10 HU
10 U
10 HU
1 Filtered samples have an "F" at the end of the sample E); dupicate samples have a "D* at the end of the sample ID
Performance Standard for organics; Monitoring Level for inorganics. Bold indicates the parameter was detected above the SOW Cone
3Because of low water level, the well purged dry and did not recover sufficiently to allow sample collection.
Data Qualifiers (refer to Appendix D for results of data vaidation)
B: Compound was found in the blank and sample.
J : Result is less than the RL but greater than or equal to the MDL and the concentration is an approximate value.
U : Indicates the analyte was analyzed for but not detected.
*: Instrument-related QC is outside acceptance Kmits.
*: LC or LCSD is outside acceptance limits.
H : Sample was prepped or analyzed beyond the specified holding time.
F1: MS and/or MSD recovery exceeds control limits.
Page 2 of 10
-------
Table 4-9
Groundwater Sample Analytical Results - 2nd Semiannual Event 2020
Alcoa-Davenport Works
Sampb D1
Sanmina Date
SOW
Cone1
FD-200831
8/31/20
FI-2008314
8/31/20
FS-200831
8/31/20
FS-200831-F
8/31/20
GM-04R-200819
8/19/20
GM-06R-200819
8/19/20
GM-09-200821
8/21/20
GM-103
HNI-200827
8/27/20
Volatile* (ug/L)
1.1.1-Trichbroethane
1,1,2,2-Tetrachbroethane
1.1.2-Trichbroethane
1.1-Dichbroetharie
1,1 -Dichbroethene
1.2-Dichbrobenzen e ,
1,2-Dichbroethane
2-Butanone (MEK)
Acetone
Acrolein _____
Benzene
Bromoform __
Carbon disulfide
Carbon tetrachbride
Chbrobenzene
Chbroethane
Chbroform
Chbromethane
cis-1,2-Dichbroethene
Dibromochbromethane
Ethybenzene
Methyl isobutyl ketone
Methylene Chloride
Tetrachbroethene
Toluene
lrans-1,2-Dichbroethene
ttrans-1,3-Dichloropropene
rrichbroethene
Vinyl chbride
Xylenes, Total
Semlvoiatlles (u g/L)
Acenaphthene
lAnthraoene
: Benzfalanthracene
Benzo[alovnene
Benzo[b]fluoranthene
Benzo[k1fluoranthene
Chrysene
Dibenz(a,h)anthracene
Di-n-butwl phthabte
Fluoranthene
Fluorene
200
0.3
5
140
7
5
4000
6300
3.5
5
700
5
100
60
80
70
80
700
560
5
5
1000
100
1.8
5
2
10000
420
2100
0.24
0.2
0.24
2A
24
0.024
700
280
280
1 U
1 U
1 U
1 U
1 U
1 U
1 U
10 U
10 U
20 U
1 U
1 U
1 U
1 U
1 U
1 U
1 U
1 U
1 U
1 U
1 U
10 U
5 U
1 U
1 U
1 U
1 U
1 U
1 U
2 U
0.2 U
0.2 U
0.2 U
0.2 U
0.2 U
0.2 U
0.2 U
0.2 U
5 U
0.2 U
0.2 U
1 U
1 U
1 U
2.6
0.9 J
1 U
1 U
10 U
10 U
20 U
1 U
1 U
1 U
1 U
1 U
1 U
1 U
1 U
1 U
1 U
1 U
10 u
5 U
1 U
1 U
1 U
1 U
1 u
1 u
2 U
0.2 U
0.2 U
0.2 U
0.2 U
0.2 U
0.2 U
0.2 U
0.2 U
5 U
0.2 U
0.2 U
1 U
1 U
1 U
1 U
1 U
1 U
1 U
10 U
10 U
20 U
1 U
1 U
1 U
1 U
1 U
1 U
1 U
1 U
1 U
1 U
1 U
10 u
5 U
1 U
1 U
1 U
1 U
1 U
1 u
2 U
0.21 U
0.21 U
0.21 U
0.21 U
0.21 U
0.21 U
0.21 U
0.21 U
5.3 U
0.21 U
0.21 U
0.22 U
0.22 U
0.22 U
0.22 U
0.22 U
0.22 U
0.22 U
0.22 U
5.4 U
0.22 U
0.22 U
1 U
1 U
1 U
1 U
1 U
1 U
1 U
10 U
6.8 J
20 U
1 U
1 U
1 U
1 U
1 U
1 U
1 U
1 U
1 U
1 U
1 J
10 U
5 U
1 U
1 U
1 U
1 U
1 U
1 U
2 U
0.8 U
0.8 U
0.8 U
0.8 U
0.8 U
0.8 U
0.8 U
0.8 U
20 U
0.8 U
0.8 U
1 U
1 U
1 U
1 U
1 U
1 U
1 U
10 U
6.3 J
20 U
1 U
1 U
1 U
1 U
1 U
1 U
1 U
1 U
1.7
1 U
1 U
10 U
5 U
1 U
1 U
1 U
1 U
1 U
1 U
2 U
0.2 U
0.2 U
0.2 U
0.2 U
0.2 U
0.2 U
0.2 U
0.2 U
4.9 U
0.2 U
0.2 U
1 U
1 U
1 U
1 U
1 U
1 U
1 U
10 U
9.1 J
20 U
1 U
1 U
1 U
1 U
1 U
1.7
1 U
1 U
0.74 J
1 U
1 U
10 U
5 U
1 U
1 U
1 U
1 U
1 U
1 U
2 U
0.2 U
0.2 U
0.2 U
0.2 U
0.2 U
0.2 U
0.2 U
0.2 U
5.1 U
0.2 U
0.68
-
1 U
1 U
1 U
1 U
1 U
1 U
1 U
10 U
5.4 J
20 U
1 U
1 U
1 U
1 U
1 U
1 U
1 U
1 U
5.1
1 U
1 U
10 U
5 U
0.39 J
1 U
1 U
1 U
0.18 J
0.66 J
2 U
0.21 U
0.21 U
0.21 U
0.21 U
0.21 U
0.21 U
0.21 U
0.21 U
5.2 U
0.21 U
0.21 U
Page 3 of 10
-------
Table 4-9
Groundwater Sample Analytical Results - 2nd Semiannual Event 2020
Alcoa-Davenport Works
| Sample D1
SOW
FD-200831
F1-2008314
FS-200831
FS-200831-F
6M-04R-200819
GM-06R-200819
GM-09-200821
GM-103
HNI-200B27
I Samolna Date
GOllb
6/31/20
8/31/20
8/31/20
8/31/20
8/19/20
8/19/20
8/21/20
B127I20
IndenoM 2 3-cdlovrene
0.24
0.2 U
0.2 U
0.21 U
022 U
0.8 U
0.2 U
0.2 U
—
0.21 U
Naphthalene
100
0.2 U
0.2 U
0.21 U
022 U
0.8 U
0.2 U
0.2 U
—
0.21 U
Phenol
2000
1 U
1 U
1.1 U
1.1 U
4 U
0.9B U
1 u
—
1 U
Pyrene
210
0.2 U
0.2 U
0.21 U
022 U
0 J U
0.2 U
0.2 U
—
0.21 U
PCBa (ug/L)
ArecloP-1242
0.5
0.1 U
0.1 U
0.099 U
0.11 U
0.1 U
0.1 U
0.52 U
—
0.11 U
Aroclor-1248
0.5
0.1 U
0.1 U
0.099 U
0.11 U
0J3
0A4
3
-
0.11 U
ArocloM254
0.5
0.1 U
0.1 U
0.099 U
0.11 U
0.1 u
0.1 u
0.52 U
-
0.11 U
Metals (ug/L)
Aluminum
7000
50 U
50 U
50 U
50 U
50 U
50 U
620
—
50 U
Arsenic
10
5 U
5 U
1.6 J
5 U
37
5.7
21
—
5 U
Barium
2000
270
270
180
1B0
670
110
370
—
190
Beryllium
4
1 U
1 U
1 U
1 U
1 U
1 U
1 u
-
1 U
Cadmium
5
1 U
1 U
1 U
1 U
1 U
1 U
1 u
—
1 U
Chromium
100
2 U
2 U
2 U
2 U
2 U
2 U
1.7 J
-
2 U
Cobalt
140
1 U
1 U
1.3
1.3
0.91 J
2A
0.6 J
—
0.35 J
Coooer
1300
2 U
2 U
2 U
2 U
2 U
23
2.7
—
2 U
Iron
4000
13000
25000
2900
1600
24000 B
2600 B
12000
—
2200
Lead
15
1 u
1 U
1 U
1 U
1 U
0.62 J B
0£3 J
—
1 U
Manganese
300
130
360
220
240
2300
2600
2500
-
23
Mercury
2
0.2 U
0.2 U
0.2 U
0.2 U
0.2 U
0.2 U
0.2 U
-
0.2 U
Nickel
100
2 U
2 U
5.6
5.6
4.2
4.9
2
—
3.8
Selenium
50
5 U
5 U
5 U
5 U
5 U
5 U
1.2 J
—
5 U
Silver
100
1 U
1 U
1 U
1 U
1 U
1 U
1 u
—
1 U
Thallium
0.5
1 U
1 U
1 U
1 U
1 U
1 U
0.43 J
—
1 U
Vanadium
7
5 U
5 U
5 U
5 U
0.86 J
0.95 J
2.8 J
-
5 U
Zinc
2000
B2
20 U
20 U
20 U
20 U
20 U
20 U
—
20 U
wet Chemistry (ua/L)
Cvanide Total
200
10 U
10 U
10 U
10 U
10 HU
10 HU
10 HF1
-
10 U
Page 4 of 10
-------
Table 4-9
Groundwater Sample Analytical Results - 2nd Semiannual Event 2020
Alcoa-Davenport Works
Sampb D1
Sanmina Date
Volatile* (ug/L)
1,1,1-Trichloroethane
SOW
Cone2
200
HS(S)-200827
8/27/20
2 U
HS(S)-200827-F
8/27/20
HX-2008267
8/27/20
1 U
JI-200820
8/20/20
1 U
JS-200828
8/28/20
1 U
1 U
JS-200828-D
8/28/20
1 U
1 U
JX-200820
8/20/20
1 U
1 U
KD-200826
8/26/20
1 U
1 U
KI-200826
8/26/20
1 U
1 U
KS-200825
8/25/20
1 U
1 U
KS-200825-F
8/25/20
1,1,2,2-Tetrachbroethane
1,1,2-T richloroethane
1,1-Dichbroetharie
1.1-Dichloroethen e ,
1.2-Dichbrobenzen e ,
1,2-Dichloroethane
2-Butanone (MEK)
ftcetone
Acrolein
Benzene
Bromoform __
Carbon disulfide
Carbon tetrachloride
Chlorobenzene
Chbraethane
Chloroform
Chloromethane
cis-1,2-Dichbroethene
Dibromochloromethane
0.3
5
140
7
600
5
4000
6300
3.5
5
700
5
100
60
80
30
70
80
2 U
2 U
13
0.39 J
2 U
2 U
20 U
20 U
40 U
2 U
2 U
2 U
2 U
2 U
2 U
2 U
2 U
500
2 U
-
1 U
1 U
1 U
1 U
1 U
10 U
10 U
20 *U
1 U
1 U
0.56 J B
1 U
1 U
1 U
1 U
1 U
1.3
1 U
1 U
1 U
1 U
1 U
1 U
10 U
72. J
20 U
0.53 J
1 U
1 U
1 U
1 U
1 U
1 U
1 U
0.59 J
1 U
1 u
1 u
1 u
1 u
1 u
10 u
10 u
20 U
1 u
1 u
1 u
1 u
1 u
1 u
1 u
1 u
1 u
1 u
1 u
1 u
1 u
1 u
1 u
10 u
10 u
20 U
1 u
1 u
1 u
1 u
1 u
1 u
1 u
1 u
1 u
1 u
1 U
1 U
1 U
1 U
1 U
10 U
5.8 J
20 U
1.9
1 U
1 U
1 U
1 U
1 U
1 U
1 U
1 U
1 u
1 U
1 U
1 U
1 U
1 U
10 U
10 U
20 U
1 U
1 U
1 U
1 U
1 U
1 U
1 U
1 U
1 U
1 U
1 u
1 U
1 U
1 U
1 U
1 U
10 U
10 U
20 U
1 U
1 U
1 U
1 U
1 U
1 U
1 U
1 U
1 U
1 U
1 u
1 U
1 U
1 U
1 U
1 U
10 U
6.7 J
20 U
1 U
1 U
1 U
1 U
1 U
1 U
1 U
1 U
1 U
1 U
1 U
-
Ethybenzene
Methyl isobutyl ketone
Methylene Chloride
Tetrachbroethene
Toluene
itrans-1 ,2-Dichtaroethene
jtrans-1 ,3-Dichloropropene
Trichbroethene
Vinyl chloride
Xylenes, Total
Semlwolatlles (ug/L)
ftcenaphthene
ftnthracene
Benzralanthracene
Benzo[aloyrene
Benzalbjfluoranthene
Benzo[kffluoranthene
Chrysene
Dibenz(a,h)anthraoene
Di-n-buNl phthalate
Fluoranthene
Fluorene
700
5
5
1000
100
1.8
5
2
10000
420
2100
0.24
0.2
0.24
2A
24
0.024
700
280
2 U
20 U
10 U
530
2 U
82
2 U
470
1.8 J
4 U
olu
0.2 U
0.2 U
0.2 U
0.2 U
0.2 U
0.2 U
0.2 U
s U
0.2 U
0.2 U
0.2 U
0.2 U
0.2 U
0.2 U
0.2 U
0.2 U
0.2 U
0.2 U
5 U
0.2 U
0.2 U
1 U
10 U
5 U
1 U
1 U
1 U
1 U
1 U
1 U
2 U
_____
0.22 U
0.22 U
0.22 U
0.22 U
0.22 U
0.22 U
0.22 U
5.4 U
0.22 U
0.22 U
1 u
10 u
5 U
1 U
1 U
1 U
1 U
1 U
1.6
2 U
_____
0.2 U
0.2 U
0.2 U
0.2 U
0.2 U
0.2 li
0.2 U
5 U
02 U
0.2 U
1 u
10 u
5U
1 u
0.47 J
1 U
1 U
1 U
1 U
0.5 J
0.22 U
0.22 U
0.22 U
0.22 U
0.22 U
0.22 U
0.22 U
0.22 U
5.4 U
0.22 U
0.22 U
10 u
5 U
1 u
0.48 J
1 U
1 U
1 U
1 U
0.36 J
0.22 U
0.22 U
0.22 U
0.22 U
0.22 U
0.22 U
0.22 U
0.22 U
5.4 U
0.22 U
0.22 U
10 u
5 U
1 U
1 U
1 U
1 U
1 U
1 U
2 II
0.21 U
0.21 U
0.21 U
0.21 U
0.21 U
0.21 U
0.21 U
0.21 U
5.3 U
0.21 U
0.21 U
10 u
5 U
1 U
1 U
1 U
1 u
1 u
1 u
2 U
__
0.2 U
0.2 U
0.2 U
0.2 U
0.2 U
0.2 U
0.2 U
5 U
0.2 U
0.2 U
10 u
5 U
1 U
1 U
1 U
1 U
1 U
1 U
2 U
0.2 U
0.2 U
0.2 U
0.2 U
0.2 U
02 U
0.2 U
0.2 U
5.1 U
0.2 U
0.2 U
10 u
5 U
1 U
1 U
1 U
1 U
1 U
1 U
2 U
___
0.2 U
0.2 U
0.2 U
0.2 U
0.2 U
0.2 U
0.2 U
5.1 U
0.2 U
0.2 U
0.2 U
0.2 U
0.2 U
0.2 U
0.2 U
0.2 U
0.2 U
0.2 U
5 U
0.2 U
0.2 U
Pages of 10
-------
Table 4-9
Groundwater Sample Analytical Results - 2nd Semiannual Event 2020
Alcoa-Davenport Works
Sample D1
SOW
HS(S)-200827
HS(S)-200827-F
HX-2008267
J1-200820
JS-200828
JS-200828-D
JX-200820
KD-200826
KI-200826
KS-200825
KS-200825-F
Sanmina Data
Cone2
8/27/20
8/27/20
8/27/20
8/20/20
8/28/20
8/28/20 I
8/20/20
8/26/20
8/26/20
8/25/20
8/25/20
0.24
0.2 U
0.2 U
0.22 U
0.2 U
0.22 U
0.22 U
0.21 U
0.2 U
0.2 U
0.2 U
0.2 U
100
0.2 U
0.2 U
0.22 U
0.2 U
0.22 U
0.22 U
0.21 U
0.2 U
0.2 U
0.2 U
0.2 U
2000
0.99 U
1.0 U
1.1 U
1 U
1.1 U
1.1 U
1.1 U
1 U
1 U
1 U
0.99 U
210
0.2 U
0.2 U
0.22 U
0.2 U
0.22 U
0.22 U
0.21 U
0.2 U
0.2 U
0.2 li
0.2 U
RGBs (ug/L)
0.5
0.1 U
0.1 U
0.098 U
0.099 U
0.1 U
0.11 U
0.1 U
0.11 U
0.1 U
0.1 U
0.1 U
0.5
0.1 U
0.1 U
0.098 U
0.099 U
0.1 U
0.11 U
0.1 U
0.21
0.1 U
0.1 U
0.1 U
0.5
0.1 U
0.1 U
0.098 U
0.099 U
0.1 U
0.11 U
0.1 U
0.11 U
0.1 U
0.1 U
0.1 U
7000
140
50 U
50 U
50 U
96
94
50 U
50 U
50 U
800
50 U
10
10
1 J
5 U
5 U
5 U
5 U
5 U
5 U
6.5
0.75 J
5 U
2000
180
160
250
210
380
370
260
59
120
110
94
4
0.38 J
1 U
1 U
1 U
1 U
1 U
1 U
1 U
1 U
1 U
1 U
5
1 U
1 U
1 U
1 U
1 U
1 U
1 U
1 U
1 U
1 U
1 U
100
2 U
2 U
2 U
2 U
2 U
2 U
2 U
2 U
2 U
1.1 J
2 U
140
0.71 J
063 J
1 U
0.28 J
0.5 J
0.5 J
0.81 J
0.21 J
0.28 J
0.49 J
0.22 J
1300
2 U
2 U
2 U
2 U
2 U
2 U
2.1
2 U
2 U
2 U
2 U
4B00
7400
180
990
640 B
370
380
10000 B
7500 A
2800 A
2700
550
15
0.86 J
1 U
1 U
0.78 J B
1.9
2
1 u
1 U
1 U
0.81 J
1 U
300
83
76
12
24
640
650
16
54
4500
3300
3300
2
0.2 U
0.2 U
0.2 U
0.2 U
0.2 U
0.2 U
0.2 U
0.2 U
0.2 U
0.2 U
0.2 U
100
2.5
2
1.9 J
2 U
2 U
2 U
2.2
8.5
2.7
2.7
1.9 J
50
5 U
5 U
5 U
5 U
5 U
5 U
5 U
5 U
5 U
5 U
5 U
100
1 U
1 U
1 U
1 U
1 U
0.095 J
1 U
1 U
1 U
1 U
1 U
0.5
0.35 J
1 U
0.24 J
1 U
0.22 J
0.31 J
1 U
1 U
1 U
1 U
1 U
7
5 U
5 U
5 U
5 U
5 U
5 U
5 U
5 U
5 U
1.6 J
5 U
2000
20 U
20 U
20 U
20 U
20 U
20 U
63
20 U
20 U
20 U
20 U
Wat Chemistry (uq/L)
Cvanide Total
200
10 U
10 U
10 U
10 HU
10 U
10 U
10 HU
10 U
I 10 U
10 U
10 U
Page 6 of 10
-------
Table 4-9
Groundwater Sample Analytical Results - 2nd Semiannual Event 2020
Alcoa-Davenport Works
Sampb D1
SOW
Cone1
LBD-01U3
LNI-200826
LS(S)-200826
NEA-011-200828
NEA-021-200826
N1-200826
NS-200828
OID-175-200824
Sanmina Date
8/26/20
8/26/20
8/28/20
8/26/20
8/26/20
8/28/20
8/24/20
Vobtlbs (ug/L)
1,1,1-Trichbroethane
200
1 U
1 U
1 U
1 U
1 U
1 U
1 U
1,1,2,2-Tetrachbroethane
0.3
-
1 U
1 U
1 U
1 U
1 U
1 U
1 U
1,1,2-Trichbroethane
S
-
1 U
1 U
1 U
1 U
1 U
1 U
1 U
1,1-Dichloroethane
140
-
1 U
1 U
20
1 U
1 U
1 U
1 U
1,1-Dichkjroethene
7
-
1 U
1 U
6.6
1 U
1 U
1 U
1 U
1,2-Dichlorobenzene
600
-
1 U
1 U
1 U
1 U
1 U
1 U
1 U
1,2-Dichbroethane
S
-
1 U
1 U
1 U
1 U
1 U
1 U
1 U
2-Butanone (MEK)
4000
-
10 U
10 U
10 U
10 U
10 U
10 U
10 U
Acetone
6300
-
10 U
6.3 J
10 U
5.7 J
5.4 J
10 U
10 U
Acrolein
3.5
-
20 U
20 U
20 U
20 U
20 U
20 U
20 U
Benzene
S
-
1 U
1 U
1 U
1 U
1 U
1 U
1 U
Bromofbrm
80
-
1 U
1 U
1 U
1 U
1 U
1 U
1 U
Carbon disulfide
700
-
1 U
1 U
1 U
1 U
1 U
1 U
1 U
Carbon tetrachloride
S
-
1 U
1 U
1 U
1 U
1 U
1 U
1 U
Chbrobenzene
100
-
1 U
1 U
1 U
1 U
1 U
1 U
1 U
Chbroethane
60
-
1 U
1 U
1 II
1 U
1 U
1 U
1 U
Chbrotorm
80
-
1 U
1 U
1 U
1 U
1 U
1 U
1 U
Chloromethane
30
-
1 U
1 U
1 U
1 U
1 U
1 U
1 U
cis-1,2-Dichbroethene
70
-
5.1
1 U
1 U
1 U
1 U
1 U
1 U
~ibromochbromethane
80
-
1 U
1 U
1 U
1 U
1 U
1 U
1 U
Ethybenzene
700
-
1 U
1 U
1 U
1 U
1 U
1 U
1 U
Methyl isobutvl ketone
560
-
10 U
10 U
10 U
10 U
10 U
10 u
10 U
Methylene Chbride
5
-
5 U
5 U
5 U
5 U
5 U
5 U
5 U
Tetrachbroethene
5
-
1 U
1 U
1 U
1 U
1 U
1 U
1 U
Tobene
1000
-
1 U
1 U
1 U
1 U
1 U
0.34 J
1 U
trans-1,2-Dichbroethene
100
-
1 U
1 U
1 U
1 U
1 U
1 U
1 U
trans-1,3-Dichioropropene
1.8
—
1 U
1 U
1 U
1 U
1 U
1 U
1 U
Trichbroethene
5
-
1 U
1 U
1 U
1 U
1 U
1 U
1 U
Vinyl chbride
2
-
1 U
1 U
1 U
1 U
1 U
1 U
1 U
Xybnes, Total
10000
—
2 U
2 U
2 U
2 U
2 U
0.29 J
2 U
Semlvolatllss (ug/L)
Acenaphthene
420
-
0.22 U
0.2 U
0.2 U
0.2 U
0.21 U
0.2 U
0.2 U
Anthracene
2100
-
0.22 U
0.2 U
0.2 U
0.2 U
0.21 U
0.2 U
0.2 U
Benzfalanthracene
0.24
-
0.22 U
0.2 U
0.2 U
0.2 U
0.21 U
0.2 U
0.2 U
Benzolaloyrene
0.2
-
0.22 U
0.2 U
0.2 U
0.2 U
0.21 U
0.2 U
0.2 U
Benzo[b]fluoranthene
0.24
-
0.22 U
0.2 U
0.2 U
0.2 U
0.21 U
0.2 U
0.2 U
Benzo[k1fboranthene
2A
-
0.22 U
0.2 U
0.2 U
0.2 U
0.21 U
0.2 U
0.2 U
Chrvsene
24
-
0.22 U
0.2 U
0.2 U
0.2 U
0.21 U
0.2 U
0.2 U
Dibenz(a,h)anthracene
0.024
-
0.22 U
0.2 U
0.2 U
0.2 U
0.21 U
0.2 U
0.2 U
Di-n-butyl phthabte
700
-
5.5 U
5 U
5.1 U
5.1 U
5.2 U
5 U
5.1 U
Fboranthene
280
-
0.22 U
0.2 U
0.2 U
0.2 U
0.21 U
0.2 U
0.2 U
Fborene
280
-
0.22 U
0.2 U
0.2 U
0.2 U
0.21 U
0.2 U
0.2 U
Page 7 of 10
-------
Table 4-9
Groundwater Sample Analytical Results - 2nd Semiannual Event 2020
Alcoa-Davenport Works
Sampb E)1
SOW
Cone2
LBD-01U3
LNI-200826
LS(S)-200826
NEA-011-200828
NEA-021-200826
NI-200826
NS-200828
OID-175-200824
Samolna Date
8/26/20
8/26/20
8/28/20
8/26/20
8/26/20
8/28/20
8/24/20
IndenoM 2 3-cdlovrene
0.24
—
0.22 U
0.2 U
0.2 U
0.2 U
0.21 U
0.2 U
0.2 U
Naphthalene
100
—
0.22 U
0.2 U
0.2 U
0.2 U
0.21 U
0.2 U
0.2 U
Phenol
2000
-
1.1 U
1 U
1 U
1 U
1 U
1 U
1 U
Pyrene
210
-
0.22 U
0.2 U
0.2 U
0.2 U
0.21 U
0.2 U
0.2 U
PCBa (ug/L)
Aroclor-1242
0.5
-
0.1 U
0.099 U
0.1 U
0.1 U
0.1 U
0.11 U
0.11 U
Arocbr-1248
0.5
-
0.1 U
0.099 U
0.1 U
0.1 U
0.1 U
1.1
0.11 U
Aroclor-1254
0.5
-
0.1 U
0.090 U
0.1 U
0.1 U
0.1 U
0.11 u
0.11 U
Metals (ug/L)
Aluminum
7000
—
50 U
130
50 U
50 U
50 U
50 U
150
Arsenic
10
-
5 U
4.1 J
5 U
5 U
5 U
14
5 U
Barium
2000
-
100
100
290
20
54
230
290
Beryllium
4
-
1 U
1 U
1 U
1 U
1 U
1 U
1 U
Cadmium
S
-
1 U
1 U
1 U
1 U
1 U
1 U
1 U
Chromium
100
-
2 U
3.2
2 U
2 U
2 U
2 U
2 U
Cobalt
140
-
1 U
1.2
1 U
1 U
0.33 J
0.32 J
0.36 J
Cooper
1300
—
2 U
2 U
2 U
2 U
2 U
2 U
2 U
ton
4900
—
640
3600 A
3400
3100 A
6700 A
6100
5500
Lead
15
-
1 U
1 U
1 U
1 U
1 U
1 U
1 U
Manganese
300
-
56
56
160
43
210
140
170
Mercury
2
-
0.2 U
0.2 U
0.2 U
0.2 U
0.2 U
0.2 U
0.2 U
Nickel
100
-
2 U
5
2.8
2 U
1.7 J
2.1
2.1
Selenium
50
-
5 U
5 U
5 U
5 U
5 U
5 U
5 U
Silver
100
-
1 U
1 U
1 U
1 U
1 U
1 U
1 U
Thallium
0.5
-
1 U
1 U
1 U
1 U
1 U
1 U
0.72 J
Vanadium
7
—
5 U
5 U
5 U
5 U
5 U
5 U
5 U
Zinc
2000
-
20 U
20 U
20 U
20 U
20 U
20 U
28
wet Chemistry (ug/L)
Cvanide. Total
200
-
10 U
10 U
10 U
10 U
10 U
10 U
10 HU
Page 8 of 10
-------
Table 4-9
Groundwater Sample Analytical Results - 2nd Semiannual Event 2020
Alcoa-Davenport Works
| Sample D1
SOW
Cone1
OlD-74-200824
OS-200824
PA-14M00825
PA-17S-200827
PA-17S-200827-D
WDS-2-200820
WDS-3-200820
WDS-5-200819
1 Samolna Date
8/24/20
8/24/20
8/25/20
8/27/20
8/27/20
8/20/20
B/20/20
8/19/20
Vobtlfew (ug/L)
1,1,1-Trichloroethane
200 || 1 U
1 U
1 U
10 U
10 U
1 U
1 U
1 U
1,1,2,2-Tetrachloroethane
0.3
1 U
1 U
1 U
10 U
10 U
1 U
1 U
1 U
1,1,2-Trichloroethane
S
1 U
1 U
1 U
10 U
10 U
1 U
1 U
1 U
1,1-Dichloroethane
140
1 U
0.7 J
0.45 J
16
16
1 U
1 U
1 U
1,1-Dichloreethene
7
1 U
1 U
1 U
7 J
73 J
1 U
1 U
1 U
1,2-Dichbrobenzene
600
1 U
1 U
1 U
10 U
10 u
1 U
1 U
1 U
1,2-Dichloroethane
S
1 U
1 U
1 U
10 u
10 u
1 U
1 U
1 U
2-Butanone (MEK)
4000
10 U
10 U
10 U
100 u
100 u
10 U
10 U
10 U
Acetone
6300
10 U
10 U
10 U
100 u
100 u
10 U
10 U
10 U
Acrolein
3.S
20 U
20 U
20 U
200 U
200 U
20 U
20 U
20 U
Benzene
S
1 U
1 U
1 U
10 u
10 u
1 U
1 U
1 U
Bromoform
BO
1 U
1 U
1 U
10 u
10 u
1 U
1 U
1 U
Carbon disulfide
700
1 U
1 U
1 U
10 u
10 u
1 U
1 U
1 U
Carbon tetrachloride
5
1 U
1 U
1 U
10 u
10 u
1 U
1 U
1 U
Chlorobenzene
100
1 U
1 U
1 U
10 u
10 u
1 U
1 U
1 U
Chbroethane
60
1 U
1 U
1 U
10 u
10 u
1 U
1 U
1 U
Chloroform
BO
1 U
1 U
1 U
10 u
10 u
1 U
1 U
1 U
Chbromethane
30
1 U
1 U
1 U
10 u
10 u
1 U
1 U
1 U
cis-1,2-Dichbroethene
70
1.1
1.5
58
1700
1800
1 U
3.6
1.3
Di bromochloromethane
80
1 U
1 U
1 U
10 u
10 u
1 u
1 U
1 U
Ethyfaenzene
700
1 U
1 U
1 U
10 u
10 u
1 u
1 U
1 U
Methyl isobutyl ketone
560
10 u
10 U
10 U
100 u
100 u
10 u
10 U
10 U
Methylene Chloride
S
5 U
5 U
5 U
50 U
50 U
5 U
5 U
5 U
Tetrachbroethene
5
1 U
1 U
6.1
4000
4100
1 u
1 U
1 U
Toluene
1000
1 U
0.35 J
1 U
10 u
10 u
1 u
1 U
1 U
brans-1,2-Dichloroethene
100
1 U
1 U
0.68 J
14
17
1 u
1 U
1 U
Kranfr-1 ,3-Dichloropropene
1.8
1 u
1 U
1 U
10 u
10 u
1 u
1 U
1 U
Trichbroethene
S
1 u
1 U
11
970
970
1 u
1 U
1 U
Vinyl chbride
2
1 u
1 U
1
18
18
1 u
1 U
1 U
Xylenes, Total
10000
2 U
2 U
2 U
20 U
20 U
2 U
2 U
2 U
Semlvolatlles (ug/L)
Acenaphthene
420
0.2 U
0.2 U
0.2 U
022 U
021 U
0.2 U
02 U
021 U
Anthracene
2100
0.2 U
0.2 U
0.2 U
022 U
021 U
0.2 U
02 U
021 U
Benzralanthracene
024
0.2 U
o 2 u
0.2 U
022 U
021 U
0.2 U
02 U
021 U
Benzo[alovrene
0.2
0.2 U
0.2 U
0.2 U
022 U
021 U
0.2 U
02 U
021 U
Benzotbjfluoranthene
0J24
0.2 U
o 2 u
0.2 U
022 U
021 U
0.2 U
02 U
021 U
Benzotklfluoranthene
2.4
0.2 U
0.2 U
0.2 U
022 U
021 U
0.2 U
02 U
021 U
Chrvsene
24
0.2 U
0.2 U
0.2 U
022 U
021 U
0.2 U
02 U
021 U
Dibenz(a,h)anthracene
0.024
0.2 U
0.2 u
02 U
022 U
021 U
0.2 U
02 U
021 U
Di-n-butyl phthalate
700
S U
4.9 U
5 U
5.4 U
5.3 U
5 U
5.1 U
52 U
Fluoranthene
280
0.2 U
0.2 U
02 U
022 U
021 U
0.2 U
02 U
021 U
Fluorene
280
0.2 U
0.2 U
02 U
022 U
021 U
0.2 U
02 U
021 U
Page 9 of 10
-------
Table 4-9
Groundwater Sample Analytical Results - 2nd Semiannual Event 2020
Alcoa-Davenport Works
| Sample t>1
SOW
Cone1
OID-74-200824
OS-200824
PA-14S-200825
PA-17S-200827
PA-17 S-200827-D
WDS-2-200820
WDS-3-200820
WDS-5-200819
I Samolna Date
8/24/20
8/24/20
8/25/20
8/27/20
8/27/20
8/20/20
8/20/20
8/19/20
hdenoM ,2,3-cdlovrene
0.24
0.2 U
0.2 U
0.2 U
0.22 U
0.21 u
0.2 U
0.2 U
0.21 U
Naohthalene
100
0.2 U
0.2 U
0.2 U
0.22 U
0.21 u
0.2 U
0.2 U
0.21 U
Phenol
2000
1 U
0.98 U
1 U
1.1 U
1.1 u
1 U
1 U
1 U
Pyrene
210
0.2 U
0.2 U
0.2 U
0.22 U
0.21 u
0.2 U
0 J U
0.21 U
PCBa (ug/L)
Aroclor-1242
0.5
0.1 U
0.11 U
0.097 U
0.11 U
0.1 u
0.098 U
0.1 U
0.11 U
Arock>M248
0.5
0.1 U
0.11 U
0.097 U
0.11 U
0.1 u
0.098 U
0.27
0.11 U
Aroclor-1254
0.5
0.1 U
0.11 U
0.097 U
0.11 U
0.1 U
0.098 U
0.1 U
0.11 U
Metab (ug/L)
Aluminum
7000
50 U
180
50 U
50 U
50 U
93
110
100
Arsenic
10
1.2 J
5 U
1.5 J
0.93 J
0.86 J
5 U
5 U
3 J
Barium
2000
160
170
230
310
320
100
180
180
Beryllium
4
1 U
0.32 J
1 U
1 U
1 U
1 U
1 U
1 U
Cadmium
S
1 U
1 U
1 U
1 U
1 U
1 U
1 U
1 U
Chromium
100
2 U
2 U
2 U
2 U
2 U
2 U
2 U
2 U
Cobalt
140
0.62 J
0.38 J
2
1.8
1.7
0.54 J
2.6
7A
Coooer
1300
2 U
2 U
2 U
2 U
2 U
2.1
2 U
2 U
Iron
4900
13000
420
4100
2400
2900
130 B
470 B
2400 B
Lead
15
1 u
1 U
1 U
1 U
1 U
1 U
1 U
1 U
Manaanese
300
280
190
500
220
220
300
4700
2900
Mercury
2
0.2 U
0.2 U
0.2 U
0.2 U
0.2 U
0.2 U
0.2 U
0.2 U
Nickel
100
4.1
3.9
6.5
7.2
7.2
4.8
9.7
31
Selenium
SO
5 U
1.3 J
5 U
5 U
5 U
5 U
5 U
5 U
Silver
100
1 U
1 U
1 U
1 U
1 U
1 U
1 U
1 U
Thallium
0.5
0d6 J
U
1 U
1 U
1 U
1 U
1 U
1 U
Vanadium
7
5 U
1 J
5 U
5 U
5 U
0.99 J
5 U
0.93 J
Zinc
2000
20 U
20 U
20 U
20 U
20 U
20 U
20 U
20 U
wet Chemistry (ua/LI
Cyanide, TQtal
200
10 HU
10 HU
10 F1 U
10 U
10 U
10 HU
10 HU
6.6 J H Fll
Page 10 of 10
-------
Table 4-10
Groundwater Sample Analytical Results - 1st Semiannual Event 2021
Alcoa-Davenport Works
Sample ID1
SOW
Cone1
ANS310318
AS-210318
GM-04R-210317
GM-06R
GM-09-210318
GM-10^210323
GM-10-210323-C
HNI-210322
HS(S)-210322
Samnlna Date
3/18/21
3/18/21
3/17/21
3/18/21
3/18/21
3/22/21
3/22/21
3/22/21
3/22/21
IP7? T TTffF"
|1,1,1-Trichloroethane
200
—
1 U
2 U
1,1,2,2-Tetrachloroethane
0.3
—
—
—
—
—
1 U
2 U
1 1,2-Trichk>roethane
5
—
—
—
—
—
1 U
2 U
1,1-Dichloroethane
140
—
—
—
—
—
1 U
7.9
11-Dichloroethene
7
—
—
—
—
—
1 U
2.6
1,2-Dichlorobenzene
600
—
—
—
—
—
1 U
2 U
1,2-Dichloroethane
5
—
—
—
—
—
1 U
2 U
2-Butanone (MEK)
4000
—
—
—
—
—
10 U
20 U
Acetone
6300
—
—
—
—
—
10 U
20 U
Acrolein
3.S
—
—
—
—
—
20 U
40 U
Benzene
5
—
—
—
—
—
1 U
2 U
Bromoform
80
—
—
—
—
—
1 U
2 U
Carbon disulfide
700
—
—
—
—
—
1 U
2 U
Carbon tetrachloride
S
—
—
—
—
—
1 U
2 U
Chlorobenzene
100
—
—
—
—
—
1 U
2 U
Chloroethane
60
—
—
—
—
—
1 U
2 U
Chloroform
80
—
—
—
—
—
1 U
2 U
Chloromethane
30
—
—
—
—
—
1 U
2 U
jds-1,2-Dichloroethene
70
—
—
—
—
—
7.2
510
pibromochloromethane
80
—
—
—
—
—
1 U
2 U
Ethylbenzene
700
—
—
—
—
—
1 u
2 U
Methyl isobutyl ketone
560
—
—
—
—
—
10 u
20 U
Methylene Chloride
5
—
—
—
—
—
5 U
10 U
Tetrachloroethene
5
—
—
—
—
—
0.17 J
380
Toluene
1000
—
—
—
—
—
1 U
2 U
trans-1,2-Dichloroethene I
100
—
—
—
—
—
1 U
6.2
trans-1,3-Dichloropropene i
1.8
—
—
—
—
—
1 U
2 U
Trichloroethene i
5
—
—
—
—
—
0.24 J
350
jlVinvl chloride
2
—
—
—
—
—
0.47 J
0.58 J
Xylenes, Total
10000
—
—
—
—
—
2 U
4 U
PCBs (ua/L)
Araclor-1242
0.5
1 u
0.54 U
0.1 U
0.1 u
0.1 u
0.89 U
20 U
—
—
Arodor-1248
0.5
12
4.6
0.79
0.68
1.2
15
220
—
—
Arodor-1254
0.5
1 U I
0.54 U
0.1 u
0.1 u
0.1 u
0.99 U
20 U
—
—
1Duplcate samples have a "D" at the end of the sample ID
Performance Standard. Bold indicates the parameter was detected above the SOW Concentration
—: not analyzed
Data Qualifiers (refer to Appendix D for results of data validation)
J : Result is less than the RL but greater than or equal to the MDL and the concentration is an approximate value.
U : Indicates the analyte was analyzed for but not detected.
Page 1 of 2
-------
Table 4-10
Groundwater Sample Analytical Results - 1st Semiannual Event 2021
Alcoa-Davenport Worhs
Sample ID1
SOW
Cone1
HX-210322
LNI-210319
LS(S)-210319
NS-210322
PA-14S-210319
PA-17S-210322
PA-17S-210322-D
Samnlna Date
3/22/21
3/19/21
3/19/21
3/22/21
3/19/21
3/22/21
3/22/21
Volatlles (ug/L)
1,11-Trichloroethane
200
1 U
1 U
1 U
—
1 U
10 U
10 U
1,1,2,2-Tetrachloroethane
0.3
1 U
1 U
1 U
—
1 U
10 U
10 U
11,2-Trichloroethane
5
1 U
1 U
1 U
—
1 U
10 U
10 U
1,1-Dichloroethane
140
1 U
1 U
1 U
—
0.19 J
5.3 J
5 J
11-Dichloroethene
7
1 U
1 U
1 U
—
1 U
1.9 J
1.9 J
1,2-Dichlorobenzene
600
1 U
1 U
1 U
—
1 U
10 U
10 U
1,2-Dichloroethane
5
1 U
1 U
1 U
—
1 U
10 U
10 U
2-Butanone (MEK)
4000
10 U
10 U
10 U
—
10 U
100 U
100 U
Acetone
6300
10 U
10 U
10 U
—
10 U
100 U
100 U
Acrolein
3.5
20 U
20 U
20 U
—
20 U
200 U
200 U
Benzene
5
1 U
1 U
1 U
—
1 U
10 U
10 U
Bromoform
80
1 U
1 U
1 U
—
1 U
10 U
10 U
Carbon disulfide
700
1 U
1 U
1 U
—
1 U
10 U
10 U
Carbon tetrachloride
5
1 U
1 U
1 U
—
1 U
10 U
10 U
Chlorobenzene
100
1 U
1 U
1 U
—
1 U
10 U
10 U
Chloroethane
60
1 U
1 U
1 U
—
1 U
10 U
10 U
Chloroform
80
1 U
1 U
1 U
—
1 U
10 u
10 u
Chloromethane
30
1 U
1 U
1 U
—
1 U
10 u
10 u
Bis-1,2-Dichloroethene
70
2.7
5.8
0.16 J
—
31
510
480
Dibromochloromethane
80
1 U
1 U
1 U
—
1 U
10 u
10 u
Ethylbenzene
700
1 u
1 U
1 U
—
. _
10 u
10 u
Methyl isobutyl ketone
560
10 u
10 U
10 U
—
10 u
100 u
100 u
Methylene Chloride
5
5 U
5 U
5 U
—
5 U
50 U
50 U
i eiracnioroetnene
5
1 U
1 U
1 U
—
8.9
810
750
: Toluene
1000
1 U
1 U
1 U
—
1 U
10 u
10 u
trans-1,2-Dichloroethene
100
1 U
1 U
1 U
—
1 U
2.8 J
2.7 J
trans-1,3-Dichloropropene
1.8
1 U
1 U
1 U
—
1 u
10 U
10 U
Trichloroethene
5
0.24 J
1 U
1 U
—
12
360
350
V/invl chloride
2
1 U
1 U
1 U
—
0.25 J
4£ J
3 J J
Xylenes, Total
10000
2 U
2 U
2 U
—
2 U
20 U
20 U
PCBs fua/L)
Aroclor-1242
0.5
0.099 U
Aroclon-1248
0.5 H —
—
—
0.086 J
—
—
—
ftroclor-1254
°-5 H ~
—
—
0.099 U
—
—
—
Page 2 of 2
-------
Table 4-11
Groundwater Sample Analytical Results - 2nd Semiannual Event 2021
Alcoa-Davenport Works
Sample ID1
SOW
Cone1
AD-210930
AI-210927
ANS-210928
ANS-21092B-D
ANS-210928-F
AS-210923
EDS-2-210927
GM-04R-210923
GM-06R-210923
Samnlna Date
9/30/21
9/27/21
9/28/21
9/28/21
9/28/21
9/23/21
9/27/21
9/23/21
9/23/21
Volatlles (uglL)
1,1,1-Trichloraethane
200
—
—
1 U
1 U
—
1 U
1 U
—
1 U
1,1,2,2-Tetrachloroethane
0.3
—
—
1 U
1 U
—
1 U
1 U
—
1 U
1,1,2-T richloroethane
5
—
—
1 U
1 U
—
1 U
1 U
—
1 U
1,1-Dichtoroethane
140
—
—
1 U
1 U
—
1 U
1 U
—
1 U
1.1-Dichk>roethene
7
—
—
1 U
1 U
—
1 U
1 U
—
1 U
1,2-Dichlorobenzene
600
—
—
1 U
1 U
—
1 U
1 U
—
1 U
12-Dichloroethane
5
—
—
1 U
1 U
—
1 U
1 U
—
1 U
2-Butanone (MEK)
4000
—
—
10 U
10 U
—
10 U
10 U *+
—
10 U
Acetone
6300
—
—
11
13
—
10 U
10 U*+
—
10 U
Acrolein
3.S
—
—
20 U*+
20 U*+
—
20 U
20 U*+
—
20 U
Benzene
5
—
—
0.46 J
0.42 J
—
1 U
1 U
—
1 U
Bromoform
80
—
—
1 U
1 U
—
1 U
1 U
—
1 U
Carbon disulfide
700
—
—
1 U
1 U
—
1 U
1 U
—
1 U
Carbon tetrachloride
5
—
—
1 U
1 U
—
1 U
1 U
—
1 U
Chlorobenzene
100
—
—
1 U
1 U
—
1 U
1 U
—
1 U
Chloroethane
60
—
—
1 U
1 U
—
1 U
1 U
—
1 U
Chloroform
80
—
—
1 U
1 U
—
1 U
1 U
—
1 U
Chloromethane
30
—
—
1 U
1 U
—
1 U
1 U
—
1 U
as-1,2-Dichloroethene
70
—
—
1 U
1 U
—
4.2
2.2
—
1 U
Dibromochloromethane
80
—
—
1 U
1 U
—
1 U
1 U
—
1 U
Ethylbenzene
700
—
—
1 U
1 u
—
1 U
1 u
—
1 U
Methyl isobutyl ketone
560
—
—
10 U
10 u
—
10 u
10 u
—
10 U
Methylene Chloride
5
—
—
5 U
5 U
—
5 U
5 U
—
5 U
Tetrachloroethene
5
—
—
1 U
1 U
—
1 U
1 U
—
1 U
Toluene
1000
—
—
1 U
1 U
—
1 U
1 U
—
1 U
trans-1,2-Dichloroethene
100
—
—
1 U
1 U
—
1 U
1 U
—
1 U
trans-1,3-Dichloropropene
1.8
—
—
1 U
1 U
—
1 U
1 U
—
1 U
Trichloroethene
5
—
—
1 U
1 U
—
1 U
1 U
—
1 U
jVinyl chloride
2
—
—
1 U
1 U
—
1 U
1.2
—
1 U
Xylenes, Total
10000
—
—
2 U
2 U
—
2 U
2 U
—
2 U
PCBs (ua/L)
Aroclor-1242
0.5
0.11 U
0.16 J
2.1 U
1 U
0.1 U
0.57 U
—
0.11 U
0.11 U
Aroclon-1248
0.5
0.11 u
0.17 U
41
28
1.1
2J
—
0.64
QJB7
Aroclor-1254
0.5
0.11 u
0.17 U
2.1 U
1 U
0.1 u
0.57 U
—
0.11 u
0.11 U
1Filtered samples have an "F" at the end of the sample ID; duplicate samples have a *D" at the end of the sample ID
^Performance Standard. Bold indicates the parameter was detected above the SOW Concentration
^The well purged dry and did not recover sufficiently to allow sample collection.
''The water level in the well was too low to allow sample collection.
—: not analyzed
Data Qualifiers (refer to Appendix D for results of data validation)
*+: LCS and/or LCSD is outside acceptance limits, high biased.
J: Result is less than the RL but greater than or equal to the MDL and the concentration is an approximate value.
U: hdicates the analyte was analyzed for but not detected.
Page 1 of 3
-------
Table 4-11
Groundwater Sample Analytical Results - 2nd Semiannual Event 2021
Alcoa-Davenport Works
Sample ID1
SOW
Cone1
GM-09-210923
GM-103
HNI-210929
HS(S)-210929
HX-210929
J1-210927
JS-210927
JX-210930
LBD-01U*
Samnlna Date
9/23/21
9/29/21
9/29/21
9/29/21
9/27/21
9/27/21
9/30/21
Vobtltes (ug/L)
1,1,1-Trichloroethane
200
1 U
—
1 U
2 U
1 U
1 U
1 U
1 U
—
1,1,2,2-Tetrachloroethane
0.3
1 U
—
1 U
2 U
1 U
1 U
1 U
1 U
—
1,1,2-Trichloroethane
5
1 U
—
1 U
2 U
1 U
1 U
1 U
1 U
—
1,1-Dichloroethane
140
0.7 J
—
1 U
11
1 U
1 U
1 U
1 U
—
1,1-Dichloroethene
7
1 U
—
1 U
3.3
1 U
1 U
1 U
1 U
—
1,2-Dichlorobenzene
BOO
1 U
—
1 U
2 U
1 U
1 U
1 U
1 U
—
1 2-Dichloroethane
5
1 U
—
1 U
2 U
1 U
1 U
1 U
1 U
—
2-Butanone (MEK)
4000
10 U
—
10 U
20 U
10 U
10 U
10 U
10 U
—
Acetone
6300
10 U
—
10 U*+
20 U*+
10 U*+
10 U
10 U
10 U*+
—
Acrolein
3.5
20 U
—
20 U*+
40 U*+
20 U*+
20 U*+
20 U*+
20 U*+
—
Benzene
5
1 U
—
1 U
2 U
1 U
1 U
1 U
2.2
—
Bromoform
80
1 U
—
1 U
2 U
1 U
1 U
1 U
1 U
—
Carbon disulfide
700
1 U
—
1 U
2 U
1 U
1 U
1 U
1 U
—
Carbon tetrachloride
5
1 U
—
1 U
2 U
1 U
1 U
1 U
1 u
—
Chlorobenzene
100
1 U
—
1 U
2 U
1 U
1 U
1 U
1 u
—
Chloroethane
60
4
—
1 U
2 U
1 U
1 U
1 U
1 u
—
Chlorofomn
80
1 U
—
1 U
2 U
1 U
1 U
1 U
1 u
—
Chloromethane
30
1 U
—
1 U
2 U
1 U
1 U
1 U
1 u
—
38-1,2-Dichloroethene
70
3.8
—
14
790
4.1
1.4
1 U
1 u
—
Dibromochloromethane
80
1 U
—
1 U
2 U
1 U
1 U
1 U
1 u
—
Ethylbenzene
700
1 U
—
1 U
2 U
1 U
1 U
1 U
1 u
—
Methyl isobutyl ketone
560
10 U
—
10 U
20 U
10 U
10 U
10 U
10 u
—
Methylene Chloride
5
5 U
—
5 U
10 U
5 U
5 U
5 U
5 U
—
Tetrachloroethene
5
1 U
—
1.7
610
1 U
1 U
1 U
1 u
—
Toluene
1000
1 U
—
1 U
2 U
1 U
1 U
1 U
1 u
—
trans-1,2-Dichlonoethene
100
1 U
—
1 U
43
1 U
1 U
1 U
1 u
_
trans-1,3-Dichloropropene
1.B
1 U
—
1 U
2 U
1 U
1 U
1 U
1 u
—
Trichloroethene
5
1 U
—
2.7
570
1 U
1 U
1 U
1 u
_
Vinyl chloride
2
2.8
—
1 U
2.8
1 U
0.69 J
1 U
1 u
Xylenes, Total
10000
2 U
—
2 U
4 U
2 U
2 U
2 U
2 U
PCBs fuafl.)
Aroclor-1242
0.5
0.12 U
—
—
—
—
—
0.11 U
—
—
Aroclon-1248
0.5 1 1J
—
—
—
—
—
0.24
—
Aroclor-1254
0.5 II 0.12 U
—
—
—
—
—
0.11 U
—
—
Page 2 of 3
-------
Table 4-11
Groundwater Sample Analytical Results - 2nd Semiannual Event 2021
Alcoa-Davenport Works
Sample ID1
SOW
Cone1
LNI-210924
LS(S)-210624
NEA-011-210929
PA-14S-210924
PA-17S-210928
PA-17S-210928-D
WDS-5-210927
Semolina Date
9/24/21
9/24/21
9/29/21
9/24/21
9/28/21
9/28/21
9/27/21
Volatile! (ufl/L)
1,1,1-Trichloraethane
200
1 U
1 U
1 U
1 U
10 U
10 U
1 U
1,1,2,2-Tetrachloroethane
0.3
1 U
1 U
1 U
1 U
10 U
10 U
1 U
1,1,2-Trichloroethane
5
1 U
1 U
1 U
1 U
10 U
10 U
1 U
1,1-Dichkjroethane
140
1 U
1 U
19
0.6 J
9.2 J
8.4 J
1 U
11-Dichloroethene
7
1 U
1 U
6.5
1 U
5.1 J
5.2 J
1 U
1,2-Dichlorobenzene
600
1 U
1 U
1 U
1 U
10 U
10 U
1 U
1,2-Dichloroethane
5
1 U
1 U
1 U
1 U
10 U
10 U
1 U
2-Butanone (MEK)
4000
10 U
10 U
10 U
10 U
100 U
100 U
10 U
Acetone
6300
10 U
10 U
10 U*+
10 U
100 U
100 U
10 U
Acrolein
3.5
20 U
20 U
20 U*+
20 U
200 U *+
200 U *+
20 U*+
Benzene
5
1 U
1 U
1 U
1 U
10 U
10 U
1 U
Bromoform
80
1 U
1 U
1 U
1 U
10 U
10 U
1 U
Carbon disulfide
700
1 U
1 U
1 U
1 U
10 U
10 U
1 U
Carbon tetrachloride
S
1 U
1 U
1 U
1 U
10 U
10 u
1 U
Chlorobenzene
100
1 U
1 U
1 U
1 U
10 U
10 u
1 U
Chioroethane
60
1 U
1 U
1 U
1 U
10 U
10 u
1 U
Chloroform
80
1 U
1 U
1 U
1 U
10 u
10 u
1 U
Chioromethane
30
1 U
1 U
1 U
1 U
10 u
10 u
1 U
as-1,2-Dichloroethene
70
5.5
1 U
1 U
65
1300
1300
1.3
Dibromochloromethane
80
1 U
1 U
1 U
1 U
10 u
10 u
1 U
Ethyibenzene
700
1 U
1 U
1 U
1 U
10 u
10 u
1 U
Methyl isobutyl ketone
560
10 U
10 U
10 U
10 U
100 u
100 u
10 U
Methylene Chloride
5
5 U
5 U
5 U
5 U
50 U
50 U
5 U
Tetrachloroethene
5
1 U
1 U
1 U
7.7
2000
2000
1 U
Toluene
1000
1 U
1 U
1 U
1 U
10 u
10 u
1 U
trans-1,2-Dichloroethene
100
1 U
1 U
1 U
1 U
10 u
5.1 J
1 U
trans-1,3-Dichk>ropropene
1.B
1 U
1 U
1 U
1 u
10 u
10 u
1 U
Trichloroethene
5
1 U
1 U
1 U
14
680
660
1 U
Vinyl chloride
2
1 U
1 U
1 U
0.78 J
15
15
1 U
Xylenes, Total
10000
2 U
2 U
2 U
2 U
20 U
20 U
2 U
PCBs fua/L)
Arodop-1242
0.5
—
—
—
—
—
—
0.11 U
Aroclor-1248
0.5
—
—
—
—
—
—
0.11 U
Aroclor-1254
—
—
—
—
—
—
°-"U I
Page 3 of 3
-------
Figure 4-12 GCETS Performance
Annual Volume
Year
Average Monthly
Volume (gallons)
Average Flow
Rate (gpm)
Total Volume
2017
9,236,667
211
110,840,000
2018
9,145,000
209
109,740,000
2019
8,893,167
203
106,718,000
2020
7,817,917
179
93,815,000
2021*
9,057,500
207
108,690,000
Volume by Well*1"
Primary Extraction Well
Average Monthly
Volume (gallons)
Average Flow
Rate (gpm)
Total Volume
PW-07
8,743,571
199
410,947,857
PW-05
9,081,364
207
99,895,000
Total for FYR Perioc
***
Primary Extraction Well
Average Monthly
Volume (gallons)
Average Flow
Rate (gpm)
Total Volume
Total Volume
8,725,456
199
510,842,857
Note: *10 months from January - October 2021
**PW-07 operated during the FYR period from January 2017 to November 2020.
PW-05 operated during FYR period from December 2020 to October 2021
***FYR period from Janury 2017 to October 2021
-------
Table 4-13 GCETS Influent VOC Concentrations - January 2017-October 2021
Analyte
Minimum
Concentration
(ug/l)
Maximum
Concentration
(ug/l)
Average
Concentration
(ug/l)
Standard
Deviation
PCE
1500
2300
1861
206
TCE
310
390
349
22
cis-l,2-DCE
2700
3900
3211
260
Vinyl Chloride
140
210
169
21
-------
APPENDIX G
FIGURES
-------
' OufSiHIor
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Radio
Towers
Riuerdale
Rivetcfate
Park
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Source: U.S.G.S Topographic Map
Silvis, Ill-Iowa Quadrangle, 41090-E4-TT'-024,1991
Scale: 1"=2000'
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Figure 1-1
It
TETRA TECH
Site Map
Alcoa-Davenport Works
Riverdaie, Iowa
J
G:\...Daveaport\pcook\RemcdiaiDesign\LTMP-Gw\Figiu,es\Figi-i-pci.ppt Source: Tetra Tech, 2016. First Quarter 2016 Groundwater Monitoring Report.
-------
Alcoa Facility Boundaries
Western
Southern
(River Shoreline)
Eastern
Figure 1-2
Alcoa-Davenport and
Surrounding Properties
Shi ye Hattery
Cedar Rapids. IA * Iowa City, IA - Des Moines, IA
Moline, IL - Bloomington, IL * Chicago, IL
http: //w w w. shive- hdttsry.com
South
Commercial & Light
Industry
Property owned by Alcoa
-------
-------
S3 KVS
^2 t^fa.
fest-1
ESflrf'-1
Flgire 2-1: FSA Unit Locatoi*
CON 12-15
Doc #10677
CURRENT WASTE MANAGEMENT UNITS
INDUSTRIAL PROCESS UNITS
HISTORICAL UNITS
tCF KAISER ENGINEERS
SCALE: 1"-2«0'
APPflOrtD BY:
DRAWN BY; M. W1LLMU5
FIGURE
2-1: FSA UNIT LOG
AT IONS
COMPANY OF AMERICA r***1 wjmbm
DAVENPORT WORKS, RWERDALE IOWA WWWMQ NUMKR
' BJKW100
-------
NORTH
I TRl
I NOR
u
GM"14 GM-24
GM-29 GM-27
CM-09
LEGEND:
© Unconsolidated Zone
Monitoring Well
<£> Oil Collection Manhole
\Invert
Buried Pipe
i i Clay Dike (Keyed to Bedrock)
' ""1 River Shoreline
l\\\Nl FWDS Oil Interception Trench
Outfall
H
TETRATECH
250
SCALE IN FEET
500
Figure 2-2
FWDS Map
Alcoa-Davenport Works
Riverdale, Iowa
-------
'Adapted from Figure 6-1 of the Technical Impracticability Evaluation Report for
Groundwater Restoration (Appendix A to the Alcoa-Davenport Works Groundwater
Feasibility Study Report, ENSR, May 2004)
SCALE
feet
PLANT
NORTH
TRUE
NORTH
/
1000
Figure 2-3
Tl Zone Boundary
Alcoa-Davenport Works, Riverdals, Iowa
Source: Tetra Tech, 2016. First Quarter 2016 Groundwater Monitoring Report.
-------
PLANT
NORTH
PARKING
is(s> ALCOA PLANT
TQMSR-01*
petic\e*Jm j
TarkFarrn
(Appro*™*5
Locati°n'
WDS-E
PROPERTY
LINE
Legend
4 Deep Bedrock Monitoring Well
Intermediate Bedrock
Monitoring Well
® Shallow Bedrock Monitoring Well
0 Unconsolidated /Shallow
Bedrock Monitoring Well
Unconsolidated Zone
Monitoring Well
O Industrial Well (Backup)
© Industrial Well
Tl Zone (approx.)
* Water Levels Only (no sampling)
Figure 2-4
H
TETRATECH
Long-Term Monitoring Well Location Map
Alcoa-Davenport Works, Riverdale, Iowa
-------
-------
FOIL M ILL
RAPX !-lG
Phase IVI Investigation Area
Arconic - Davenport Works
Riverdate, Iowa
LEGEND
Figure
3-1
Geosyntec0,
consultants
Columbia, Maryland February 2010
Phase I Investigation Area
Soil Gas Test Hole
-------
-------
-------
-------
SHALLOW BEDROCK
GROUNDWATER POTENTIOMETRIC SURFACE MAPS
-------
PLANT
NORTH
PARKING
^GMSR-Ol
562.80 (1
OUTFALL 006
FORME\
WASTEX
disposal"
SITE
OUTFALL 002
PROPERTY
LINE
Section 5.1.3 for a discussion related to vertical gradients
TETRATECH
ARCONIC
Shallow Bedrock Groundwater
Piezometric Surface Map
March 14, 2017
Arconic-Davenport Works, Rlverdale, Iowa
~\
V
Legend
567.28
Shallow Bedrock
Monitoring Well
Groundwater Elevation {ft AMSL)
Groundwater Elevation
Contour (ft AMSL) (dashed
where inferred)
PUMJ5 e industrial Weil (Backup)
PW-07 q industrial Well
Figure 4-1
J
-------
PLANT
NORTH
PARKING
yGMSR-01
564.32 f?
~///
FENCi
FORMER
i WASTE
1SPOSAL
\SITE
PROPERTY
LINE
See Section 5.1.3 for a discussion related to vertical gradients
Legend
, Shallow Ikedrock
B87 W Monitoring Well
Groundwater Bmatan (ft AMH)
V
Groundwater Elevation
Contour (ft AMS.) (dsM
artiere inferred)
P,*MB B Industrial Well (Backup)
Figure 4-2
TETRATECH
Shallow Bedrock Groundwater
Piezometric Surface Map
June 12,2017
ArecnloDasfanpert Works, RhrntWa, Iowa
-------
-------
PLANT
MORTH
PARKING
^GMSR-Ol
564.10f9
ooo'
=J°8
T.DS **
"(gl n 4$
\ 560.41
FORMER
WASTE
DISPOSAL
I SITE
PROPERTY
LINE
See Section 5.1.3 for a discussion related to vertical gradients
Legend
56&4S
V
Shallow Bedrock
MonKorins Well
Groundwater ElewMJon (ft AtlSL|
Groundwater Elevation
Contour (ft AMSL) (dahed
PMMJSg industrial Well (Backup)
pw"°7 0 Industrial Well
Figure 4-4
ARCONIC
"It
TETRATECH
Shallow Bedrock Groundwater
Piezometric Surface Map
March 12,2018
ArecriloDssfanpert Works, Rlvsrdate, Iowa
-------
SCALE N FEET
FS
567.79
See Section 5.1.3 for a discussion related to vertical gradients
Legend
FS®
587.79
V
Shallow Bedrock
ManKuriRji Well
GnundwHn Etewattan (ft AMSL)
Groundwater Elevation
Contour (ft AMSL) (dashtd
where Inferred)
e Industrial Weil (Backup)
pw-°7 Industrial Well
Figure 4-5
ARCONIC
It
TETRATECH
Shallow Bedrock Groundwater
Piezometric Surface Map
September 20,2018
Arcank>"D®sripcr5 Wbrka, Rtoerdafe, Iowa
-------
SCALE N FEET
" ¦ ¦ :-- £\
y#/.
v ! . -, . - r
"••i ;:•-%•-' ?•* •'-. ¦•¦•••.'.";'4 "¦•?' •¦¦'"-;V>,:,'- — ' ? ' "
See Section 5.1.3 for a discussion relatsd to vertical gradients
Legend
568.18
V
Shallow Bedrock
Monitoring Well
Groundwater Election (ft AMSL)
Groundwater datedon
Contour {ft AMSL) (dashed
where inferred)
pw"05 O Industrial Wall (Backup)
pw"Qr? Industrial MM
Figure 4-6
ARCONIC
It
TETRATECH
Shallow Bedrock Groundwater
Piezometric Surface Map
March 18, 2019
Aramlo-Oawenport Works, Rlverdsfa, Iowa
-------
-------
ARCONIC
TETRATECH
Intermediate Bedrock Groundwater
Piezometric Surface Map
March 16,2020
Ancorslo-Dawsnport Works, Riwnialo, Iowa
Water level at PW-G7 is assumed (see Sscflort 5.1.1]; fteii'OID' kopenicrost intermediate and-deepbedrock zones
WA-Q1I
a
567.97
Fl
567.70
NEA-011
567.74
NIEA-021
567.21
564.68
/
55746
Legend
Fl®
567.70
V
Intermediate Bedrock
Monitoring Well
Groundwater Elevation (ft AMSL)
Groundwater Elevation
Contour (ft AMSLJ (dashed
where inferred!
Industrial Weil (Backup)
pw'°7 O Industrial Weil
Figure 4-8
J
-------
PLANT
NORTH
h\g\^n£!
PARKING
GMSR-01
(ffi 566.71
FENCi
FORMER
. WASTE
Disposal
\site
OUTFALL CJCI2
ANS^
PROPERS
LINE
Section 5.1.3 for a discussion related to vertical gradients
A
Legend
F9 Shallow Bedrock
5i7 28 Monitadng Well
Groundwater Etesrtton (ft AMSL)
V
firmmdwatar Elevation
Contour (ft AMSL) (dashed
where fctfemuf)
r*MS as industrial Well (Backup}
m-m
Industrial Well
Figure 4-9
ARCONIC
TETRATECH
Shallow Bedrock Groundwater
Piezometric Surface Map
August 17, 2020
Aiconlo-OawnpEsrt Works, Rivafdala, km
-------
-------
-------
INTERMEDIATE BEDROCK
GROUNDWATER POTENTIOMETRIC SURFACE MAPS
-------
"A
'TT^, 552.74 533 70' ¦'¦'-
, .S3.%
:vr
-------
-------
-------
-------
-------
-------
-------
ARCONIC
TETRATECH
Intermediate Bedrock Groundwater
Piezometric Surface Map
March 16,2020
Ancorslo-Dawsnport Works, Riwnialo, Iowa
Water level at PW-G7 is assumed (see Sscflort 5.1.1]; fteii'OID' kopenicrost intermediate and-deepbedrock zones
WA-Q1I
a
567.97
Fl
567.70
NEA-011
567.74
NEA-021
567.21
564.68
/
55746
Legend
Fl®
567.70
V
Intermediate Bedrock
Monitoring Well
Groundwater Elevation (ft AMSLJ
Groundwater Elevation
Contour (ft AMSLJ (dashed
where inferred!
Industrial Weil (Backup)
pw'°7 O Industrial Weil
Figure 4-19
J
-------
-------
-------
ARCONIC
TETRATECH
Intermediate Bedrock Groundwater
Piezometric Surface Map
September 13,2021
Anconio-Disvofiport Works, Rlwrtate, low
Fl
567.41
NEA-01I
56,7.4 2
NEA-02I
567.08
LNI
561.82
557.39
Wft-Gll
9
584,55
\% 557.36
%
Water level at PW-05 is assumed (see Section 5.1.1); SfaiCQID is open across intermediate and deep bed rock zones
Fl®
567.41
V
Legend
Intermediate Bedrock
Monitoring Well
SreuKtoter Elevation (ft AMSL)
firaundwater BevaHon
Contour (ft AMSU (dashed
where Inferred)
««*© Industrial Well (Backup)
® Industrial Well
Figure 4-22
J
-------
DEEP BEDROCK
GROUNDWATER POTENTIOMETRIC SURFACE MAPS
-------
f '
y: ; i v •. 534.25 535.y4
.-r'v. "¦¦ '¦ ,¦ v- " ~ ' " u' ¦' ' _
, " 1 I :.
Water level at PW-07 is assumed (seeSetfiort 5.1.1); well'OlD' is open across intermediate and: deep bedrock zones
Legend
FD ,. Deep Bedrock Monitoring Well
S68.07 Groundwater Elevation {ft AMSL)
V
PW-OS
PW-07
Groundwater Elevation
Contour (ft AMSL) (dashed
where inferred)
Industrial Weil (Backup)
Industrial Well
Figure 4-23
Deep Bedrock Groundwater
Piezometric Surface Map
March 14. 2017
Arconio-Davenport Wortts, Riverdale, Iowa
-------
- 553.7* 639.03 540*3 %*£} *;\v.
i •¦; ¦£ v'.Vv' &jJ" Ptff •>.-•. "V* V* */•¦: ¦1»'i ¥• .**. ¦¦ .¦
" ' T .yiSV: - 'Xy>- \ .;*¦ •*$»»• •' s. •J" "¦¦*«¦ / '*.•= -• > ¦' s" '
--.•..V-V * A.-!/- -¦
Water level at PW-07 is assumed (see Section 5.1.1); weH'OlD is open across intermediate antf-deep bedrock tones
Legend
FD Deep Bedrock Morftoring Well
SS8JBI Groundwater Elevation (ft AMSL)
V
GroumNiatsr Elevation
Contour {ft AMSL) (dashed
where inferred)
pw~as e Industrial Well (Backup)
pw"07 Industrial Well
Figure 4-24
ARCONIC
It
TETRATECH
Deep Bedrock Groundwater
Piezometric Surface Map
June 12,2017
Areonto-Dswsnpart Works, RhfwsJsta, Iowa
-------
SCALE NFEET
Water level at PW-07 is assumed (tee Section 5.1.1]; weil'OlD Is open across intermediate antNeep bedrock zones
Legend
FD Deep Sedraek Modtarfaig Well
567i78 Sraundmster Elevation (ftAMSL)
V
(Sroundwste: Election
Contour {ft AMSL) jdshed
where inferred)
pw~os m Induitrial Well (Backup)
m-°7 Industrial Well
Figure 4-25
ARCONIC
"It
TETRATECH
Deep Bedrock Groundwater
Piezometric Surface Map
September 11,2017
Arcanlo-Damnpcut Works, Riverdste, lam
-------
SCALE N FEET
:;T^ 536.18 ~ 337.72
%V3£l'&\r'
Water level at PW-07 is assumed (see Section 5.1.1); well DID is open across Intermediate and deep bedrock zones
i / -f" i. ¦•: 33H.1U »'¦'<
Legend
FD Deep Bedrock Mlmltaring Well
SS7Si Groundaiater Elevation {ft AMSL)
V
PW-Q5,
PW-07
Groundwater Elevation
Contour (ft AMSL) (dashed
where inferred)
Industrial Well {Backup)
Industrial Well
Figure 4-26
ARCONIC
lit I
TETRATECH
Deep Bedrock Groundwater
Piezometric Surface Map
March 12,2018
Arcanjo-Davenport Work*, Rivedffe, Io\m
-------
SCALE N FEET
lb
568,97
V
PW-05
rai-07
Legend
Deep Bedrock Monitoring Well
Groundwater Bwaitem {ft AMSL)
Groundwater Etoation
Contour (ft AMSL) {dashed
where Inferred)
industrial Well (Backup)
Industrial Well
Figure 4-27
TETRATECH
Deep Bedrock Groundwater
Piezometric Surface Map
September 20,2018
Arconto-Davenpart Works, Riverdale, Iowa
J
PLANT
NORTH
PARKING
OUTFALL
PRCPERTY
LINE
Water level at PW-07 is assumed (see Section 5.1.1)! «nl OiDls open across intermediate antfrfeep bedrock zones
-------
-------
lb
Legend
FD
56934
V
PW-flS
PW-07
Deep Bedrock MonllalnjIM
(groundwater Eievttian {ft AMSL)
SrauwSswtor Elevation
Contour (ft AMSL] (dashed
where inferred)
industrial Well (Backup)
Industrial Well
Figure 4-29
TETRATECH
Deep Bedrock Groundwater
Piezometric Surface Map
September 23, 2019
ArcQnie-Dnwripait Mtortec, Rlvsrdab, (awe
J.
561.32
552.80
Water level at PW-07 is
-------
/"T
SCALE W FEET
848.23-»
¦ -1\-p'.;f*'/®f&,t; i:,i^;&'?»*'*Z • ¦'-.. ¦:•¦'
Water level at PW 07 i» muiiicd (jet Duetto 5.1.1j; nnJKOlP h'upen'xxgtf >it«i )nedlite wid'dttplacdieuJt loriet
Legend
FD Deep Bedrock Monitoring Well
888J® GraundiMMar Bwntlon (ft AMSLJ
V
Srousidwater Elevation
Contour (ft AM5IJ (dashed
where Inferred)
S Industrial Wiell (Hackup)
PW-07
O Industrial Well
Figure 4-30
ARCONIC
TETRATECH
Deep Bedrock Groundwater
Piezometric Surface Map
March 13,2020
Arante-Bgwanpcrt Works, Rivandala, low
-------
SCALE N FEET
A>\v S&.&
»S*^ rM^^rSAs*9" 546.25 * *"v
Water level at PW-07 Is assumed (see Secflori S.L1); ttwII OID Is open across Intermediate: and Jeep bedrock zones
Legend
FD Deep Bedrock Monitoring Well
56B.23 Groundwater ElenAon (It AMD)
V
Groundwater Elevation
Contour (ft AMSL) (dashed
pw"® O Industrial Well (Backup)
pw"07 Q Industrial Well
Figure 4-31
ARCONIC
TETRATECH
Deep Bedrock Groundwater
Piezometric Surface Map
August 17, 2020
Areonio-Davanpor! Works, Rlwtfcfe, low
-------
n
SCALE N FEET
5 -
- u ......^- \V 047.82 548.66 ^
V £ - •
Water level at PW-OS is assumed (see Sectlori 5.1.1), wettfOID is open across intermediate Srtdf deep bedrock tones
Legend
FD DeepBadroek Monitoring Wail
560.38 Groundwater Bwtlun (It AMSL)
V
6roundw*ter Elevation
Contour (ft AMSL) jdaM
where Inferred)
PMKisO Industrial MM) (Backup)
pwa?© Industrial Weil
Figure 4-32
ARCONIC
Us
TETRATECH
Deep Bedrock Groundwater
Piezometric Surface Map
March 16,2021
Arconio-Davenport Works, RteMMnt ia»?
-------
SCALE N FEET
.. V V' - .'\5 jfc --If {*?*' »/•;? • ^ ^
Water level at PW-05 is assumed (see Secfiori S.l.lj; weiroiD is open across intermediate and de£p bedrock zones
Legend
FD Deep Badroek Monitoring Wail
861=13 6roun4nrat*r Elevation {ft AMSl)
V
6raundw*ter Elevation
Contour (ft AMSL) jdaM
where inferred)
PMK!50 Industrial MM) (Backup)
pwa?© Industrial Well
Figure 4-33
ARCONIC
TETRATECH
Deep Bedrock Groundwater
Piezometric Surface Map
September 13,2021
Araenic-Oiwanpoft Works, Rivardsk!, tcm
-------
GROUNDWATER ELEVATIONS
RIVER SHORELINE
-------
r
fDS-2
563.72 M--GM.09
L_ _ ^ £*" :Ws£*m~" 563.96 Stf*
.'.v**<^iV.'.• p,r~ ¦$ .;TT^r*^ &'r ~ _ ® ,f,- ^5-*
JBD-
¦ ^ 564.04
Gtf-QS J&l&tm
«l®- :
>¦* 564.01
y&M,£%sf
See Section 5.1.3 for a discussion related to vertical gradients
Legend
WCS-5 Unconsolidated Zone
5S3 72 Monitoring Well
Groundwater Elevation (ft AMSl)
GM-80Q# Unconsolidated /Shallow
§83 §6 Bedrock Monitoring Well
Groundwater Elevation (ft AMSL)
pw"05 @ Industrial Weil (Backup)
PW-07 ^ industrial Well
Figure 4-34
ARCONIC
TETRATECH
Groundwater Elevations - River Shoreline
March 14, 2017
Arconic-Davenpor! Works, Riverdale, Iowa
-------
-------
-------
-------
-------
WDS-5 S
566J01
Legend
UnetsmsalldMed Zona
Mentoring Well
Groundwater EtooXkm (ft AMSLJ
GM-8DC1 Unconsolidstad /Shallow
SS4JSS Mroefc Monitoring Weil
Groundwater Elevation (ft AMSL)
p*'® 9 Industrial Well (Backup)
m'4n « Industrial Well
It
Figure 4-39
TETRATECH
Groundwater Elevations - River Shoreline
March 18,2018
Arconfo-Qwenpart Works, Rtertstfe, Iom®
J
PARKING
OUTFALL 006
PW-07
LBD-OIU
565.41
FORMER
WASTE
DISPOSAL
SITE
GM-05
565.19
GM-03
567.57
GM-04R
565.32
GMrO€R
• 565.59
PROPERTY
LINE
565.50
See Section 5.1.3 for a discussion related to vertical gradients
-------
FORMER GM-ff
WASTE
DISPOSAL
GM-Q5
§64,96 584.78
6M-8D ^M-S6rS
583jB8
664.77
. ^^ —< , 564.68 ^
See Section 5.1.3 far a discussion related t'a vertical gradients'
Legend
(junc. r Uneamelldated Zona
M MomStoriRg Well
Sraundwaier Elevation (ft AMSL)
6M4SD O Unesittolldsted /Shallow
mft Bedrock Manftwhig Well
Groundwater Eleuatten (ft AMSL)
pw"05 © Industrial Well (Backup)
PW"07 © Industrial Well
Figure 4-40
ARCONIC
lb
TETRATECH
Groundwater Elevations - River Shoreline
September 23,2010
Arconio-Davenport Vtofics, Rsmstete, Ism
-------
-------
See Section S.1.3 for a discussion related to vertical gradients
Legend
wass Una—MiMlin
SB5 IS Monitoring Well
' Sreundwater ilewition (ft AMSL]
GM-SDO UncansaM-Metl /Shallow
810 S? Bedrock Monitoring Well
Groundwater Elevation (ft AMSL]
pw"as © industrial (Nell (Backup)
pw"07 Q Industrial Well
Figure 4-42
ARCONIC
TETRATECH
Groundwater Elevations - River Shoreline
August 17, 2020
Arconio-Disvenport Works, Riverdaies, low
J
-------
-------
See Section 5.1.3 for a discussion related tb vertical gradients
M-04R
Iftf. 561.42
^P<$6tlV*
SS1 .44 =» 561.99 j.EDS-3
, ^ 561.25? „ ......
562.17 > 56?-25
Legend
WDS-5 Uneowsalldattd Mm
s . * MMNwtett WeN
Graundwrater EiewMfon (ft AMSL)
GM-8DO Unconsolidated /Shallow
KgMjo Bedrock Manitariiig Well
Groundwater BmrMw* {ft AMSL)
™«»8 industrial Well fSackupj
PW-OT
0 Industrial Well
Figure 4-44
ARCONIC
TETRATECH
Groundwater Elevations ~ River Shoreline
September 13,2021
Afccmf&Oaaenport Works, Rlveniate, low
-------
HNIVOC Trend Chart
1000
100
— 10
u
c
o
u
0.1
oo ^ ^
Cft
-------
HS(S) VOC Trend Chart
10000
1000
tso
100
o 10
u
0.1
«ao a. u
3 CJ 51
< co Q
to
to
ra
r- h. oooooioioohh
HrlHHHHfMfMfMN
C Q. Q-jJ: Q. 00 '
-% qj Jg m *0 iii W 3 <0
—« t/>
t/1
a.
QJ
t/5 § < ^ tn
PCE
TCE
DCE
VC
Date
Figure 4-46
-------
PA-14S VOC Trend Chart
10000
1000
100
o
u
10
0.1
csa cl o
< U) Q
no & a
ra d ro a,
^ ^ X
PCE
ICE
DCE
VC
Date
Figure 4-47
-------
PA-17S VOC Trend Chart
eto
o
u
10000
1000
100
10
0.1
T
oo^^inmminyss.DiDus
G1 rH tH t—I tH tH *H *H *—II t—I i—I
V a. 6
QJ QJ
to Q
go q. u *-
3 qj oj ro
< (/) Q ^
C Q. U J-
~ 0) | ™
—« uo Q 5
L. U. — * J — yr —— uu * *
Date
PCE
»TCE
DCE
VC
Figure 4-48
-------
LNIVOC Trend Chart
100
10
w
o
u
0,1 -b
A
i
T
inmmLnaiDiDtDNN
*- C Q. u s-
fO 3 QJ Q) ro
5 t/> Q 5
c
3
Q. O
CD
c/i Q
ro
c
3
NOOOOO^ffiOOHH
tH I rl tH *H fSl CN (N CVj
Q_4_ O i- M5- Q
as"j^n!^(D3njjj
PCE
*TCE
DCE
VC
Date
Figure 4-49
-------
Figure 4-50
Trends in Channel Catfish PCB Data - MRP15 Site
1200
is 1000
*?
£
w
a
o
•m
G*
Im
+*
| 600
a
o
U
8 400
PM
H 200
800
0
95% UCL
Mean
1
T
1990
1992
1994 1996
Channel Catfish MRP15 Site
2012
2016
MRP 15 Site - Combined Sites 2, 3 and 4
Source: AECOM, 2017. Mississippi River Pool 15: Monitored Natural Recovery Program - 2016, Arconic-Davenport Works, Iowa. January 2017
-------
Figure 4-51
Trends in Common Carp PCB Data - MRP15 Site
3500
3000
'So
jr
12500
a
.2
I 2000
+*
s
v
o
® 1500
PS
u
S iooo
81
©
H
500
0
95% UCL
Mean
Common Carp Common Carp Common Carp Common Carp Common Carp Common Carp Common Carp
1990 1992 1994 1996 1998 2012 2016
MRP15 Site - Combined Sites 2, 3 and 4
Common Carp MRP15 Site
Source: AECOM, 2017. Mississippi River Pool 15: Monitored Natural Recovery Program - 2016, Arconic-Davenport Works, Iowa. January 2017
-------
Figure 4-52
Trends in Channel Catfish at Sites 2,3 and 4
1990 1992 1994 1996 2012 2016 1990 1992 1994 1996 2012 2016 1990 1992 1994 1996 2012 2016
Source: AECOM, 2017. Mississippi River Pool 15: Monitored Natural Recovery Program - 2016, Arconic-Davenport Works, Iowa. January 2017
-------
Figure 4-53
Trends in Common Carp at Sites 2,3 and 4
6000
|P
A
5000
a
S
"-C
C5
u
«•»
a
u
u
fl
o
U
PQ
U
Ph
o
H
4000
3000
2000
1000
0
1990 1992 1994 1996 1998 2016 1990 1992 1994 1996 1998 2016 1990 1992 1994 1996 1998 2016
Source: AECOM, 2017. Mississippi River Pool 15: Monitored Natural Recovery Program - 2016, Arconic-Davenport Works, Iowa. January 2017
-------
O VUaterfine
Tree Line
* 2003
- 2012
2017
2020
NOTE:
TREE LINE MONITORING
NEAR ARCONIC OUTFALL 006
DRAWN BY:
C.SMITH
REVIEWED BY:
J.ORR
REVISION NUMBER:
REV. 0
ARCONIC
GRAVEN PORT, IOWA
12/2/20
IMPACT ASSESSMENT AND PERMITTING
-------
V ¥/
ml1
>, ¦ r
Sid
AECOM
Figure 55
TREE LINE MONITORING
NEAR ARCONIC WATER INTAKE
DRAWN BY:
C.SMITH
REVIEWED BY:
J.ORR
APPROVED BY:
REVISION NUMBER:
REV. 0
ARCONIC
GRAVEN PORT, IOWA
NOTE:
12/2/20
IMPACT ASSESSMENT AND PERMITTING
-------
-------
ARCONIC
Davenport, IA
AZCQM
Franklin. Tennessee
SCALE:
1:6,000
DRAWN BY:
CHECKED BY: CC
DATE:
01/17/17
DATE:
01/17/17
G:VUcm\Di venport V2012Mipi\2012_Akx»_D»venport_OutfaJ ELPrsgrenlon
Vegetation Succession
Near Arconic Water Intake
(1994-2011)
PROJECT NO:
60517941
FIGURE NO:
57a
9/26/2006
-------
~
ARCONIC
Davenport, IA
AZCOM
Franklin Tennessee
Vegetation Succession
Near Arconic Water Intake
(2013-2019)
PROJECT NO:
60517941
SCALE:
1:6,000
DRAWN BY: DW
DATE: 01/17/17
FIGURE NO:
57b
CHECKED BY: CC
DATE: 01/17/17
G:VUa*\D«wnport\2D12\AtapiB012_Akm_D»venport_OifHaJ E_Prsgreaslon
-------
9/26/2006
5/3/2002
Davenport, IA
AICOM
Franklin. Tennessee
SCALE:
1:6.000
DRAWN
DW
CHECKED BY: CC
wmm
mmwm
DATE:
CI/17/17
Vegetation Succession
Near Arconic Outfall 006
(1994-2011)
PROJECT NO
mmm
FIGURE NO:
58a
3/19/1997
-------
ARCONIC
Davenport, IA
MZCOM
Franklin, Tennessee
SCALE:
DRAWN BY: DW
DATE: 01/17/17
1:6.000
CHECKED BY: CC
DATE: 01/17/17
Gr W Ic oaiD av en pom20121M aps!2012 _Alc»a _Dav 6np*rt_Outfalie_Progres8ion
Vegetation Succession
Near Arconic Outfall 006
(2013-2019)
PROJECT NO:
60517941
FIGURE NO:
58b
-------
8/18/2011
AICOM
Franklin, Tennessee
SCALE
DRAWN SKS £*
DATE: 01/17/17
1:6.000
CHECKED BY; CC
DATE: mmm.
G MiponOOiziM ij»t20i2_">eoa_o»*Mioort jDuttJ3_Pf ovKsif-'
Vegetation Succession Near
Arconic Outfalls 002 and
003(1994-2011)
PROJECT NO.
mmm
PIGURE NO:
59a
-------
ARCONIC
Davenport, IA
AICOM
Franklin, Tennessee
SCALE:
DRAWN BY: DW
DATE: 01/17/17
1:6,000
CHECKED BY: CC
DATE: 01/17/17
G:\Alc«aiDavenport\2D12\Majs>2l12_JAlc«a_Davenport_Outtall2an(J3_Progresslon
Vegetation Succession Near
Arconic Outfalls 002 and 003
(2013-2019)
PROJECT NO:
60517941
FIGURE NO:
59b
-------
APPENDIX H
INSTITUTIONAL CONTROLS
-------
~
10 WA
AMERICAN WATER
Cross Connection Program
Backflow Prevention & Cross
Connection Control
Davenport, Bettendorf, Clinton, LeClaire, Riverdale,
Dixon & Panorama Park
-------
IOWA AMERICAN WATER
CROSS CONNECTION CONTROL PROGRAM
Iowa American Water has the responsibility to implement and conduct a cross
connection control program. Legal authority to conduct the program is based upon the
requirements of Iowa American Water's Tariff, the Iowa Department of Natural
Resources and the Iowa Department of Public Health. These Departments have
established rules referencing guidelines for the containment of potential potable water
contamination within the premises of the user, and the associated responsibilities of
public water supplies (Iowa American Water) to protect the public water supply from
possible contamination resulting from cross connections. This program will apply to all
present and future operating locations of Iowa American Water.
SECTION I - PURPOSE
The purpose of these operating policies is to:
A Protect the public potable water supply served by Iowa American Water from the
possibility of contamination or pollution by containing within the customer's
internal distribution system or the customer's private water system, such
contaminants or pollutants that could backflow or back siphon into the public
water system.
B. Promote the elimination or control of cross-connections, actual or potential,
between the customer's internal potable water system and non-potable water
systems, plumbing fixtures, and industrial piping systems.
C. Provide a continuing cross-connection control program that will systematically
and effectively prevent the contamination or pollution of the potable water
distribution system.
D. Ensure compliance with relevant Federal, State, and local regulations regarding
cross connection control.
It is prohibited for any person, firm, or corporation at any time to make, maintain, or
cause to be made or maintained, temporarily or permanently, for any period of time, any
cross-connection between plumbing pipes or water fixtures being served with water by
Iowa American Water and any other source of water supply. It is also unlawful to
maintain any sanitary fixture or other appurtenances or fixtures, which by reason of their
-------
construction may cause or allow backflow of water or other substances into the water
ii
supply system and/or the service of water pipes or fixtures of any consumer of Iowa
American Water. Iowa American Water has no responsibility over water systems on
private property and takes no legal responsibilities for their safe operation.
SECTION II - BACKELQWJEPOTECTION RE-QUjRHiBim
A General Provisions
1. Unprotected cross-connections with the public water supply are
prohibited.
2. This program is designed for containment protection of the distribution
system and requires the water customer to install, at the customer's
expense, an approved backflow prevention assembly as close as
possible to the meter, on the customer's side, as practicable and before
any branching occurs when notified by the Water Company. The
installation of the backflow assembly will be required as a condition for
continued service for existing customers and before a new service will be
granted. The installation of all backflow prevention assemblies required
by this program must be performed by a Qualified Backflow Assembly
Installer.
3. This program applies to all commercial, industrial, and public authority
facilities. Establishments that have only drinking fountains, restrooms,
and kitchen facilities having non-commercial type water using appliances
may not be required to install a backflow prevention assembly at the
discretion of the Water Company.
4. The Water Company will require backflow protection on residential
customers when the following conditions exist:
the premises has an auxiliary water supply;
the premises has an underground sprinkler system or swimming
pool
the premises has a private fire protection
the premises has a reported history of cross connections being
established or re-established; and
the premises has boiler, chiller or geo thermal heat systems
-------
• the premises has permanently installed means of internally
pressurizing the water supply (e.g. pressure booster, power shower,
etc.).
multi-family dwellings on one service line
5. Wherever backflow protection is determined to be required on a water
supply line entering a water customer's premises, all such water supply
lines from the Water Company's mains entering such premises, shall be
protected by an approved backflow prevention assembly.
6. Temporary connections to the public water supply are prohibited unless
authorized by the Water Company in writing. If a temporary connection is
permitted the proper metering and backflow prevention assembly, as
approved by the Water Company, will be required.
7. Fire Prptect'pn Systems
All existing fire protection systems connected to the Company's water
supply shall be protected, at a minimum, with a Double Check Detector
Valve Assembly.
Where an existing system contains antifreeze, fire retardant, or other
chemical it shall be protected by a Reduced Pressure Detector Check
Valve Assembly.
All newly installed fire protection systems connected to the Company's
water supply shall be protected with a Reduced Pressure Detector Check
Valve Assembly if:
• The system contains antifreeze, fire retardant, or other chemicals;
• There is a connection whereby water can be pumped into the fire
protection system from any other source (this includes fire department
connections);
8. GmifisitoiQijiwn irriqatiflaJSYStema
The potable water supply to lawn irrigation systems shall be protected
against backflow by a reduced pressure principal backflow assembly (RP).
-------
The type of protection that shall be required to prevent backflow into the
approved water supply shall be commensurate with the degree of hazard that
exists on the customer's premises. The degree of hazard will be determined
through the Water System Survey process, or the new customer review. The
types of backflow prevention assemblies that may be required (listed in
increasing level of protection) are as follows: Double Check Valve Assembly
(DC), Double Check Detector Assembly (DCDA), Reduced Pressure Principle
Backflow Prevention Assembly (RP), Reduced Pressure Detector Assembly
(RPDA), and Air-gap separation (AG). The water customer may choose a higher
level of protection than required by the Water Company. Situations will be
considered on a case by case basis and the appropriate backflow protection shall
be determined by the Water Company.
Implementation of regulatory requirements begins with classification of degree of hazard
based upon University of Southern California and Uniform Plumbing Code guidance.
Through the use of surveys and/or on site visits, the hazard classification can be
reduced or elevated accordingly based upon observed hazards and their corresponding
contamination potential.
The facilities listed below are intended to be general categories of all water using
facilities. Some facilities may not fit perfectly into one of the categories listed. This list is
intended to be a guideline, and may not be all inclusive.
Commercial
Backflow protection commensurate with the degree of hazard at each of these facilities
will be required.
Automotive Plants
Auxiliary Water Systems
Beverage Bottling Plants
Boilers and chillers, Geo Thermal Heat
Breweries
Canneries, Packing Houses and Rendering Plants
Car Wash Facilities
-------
Chemical Plants, Manufacturing, Processing, Compounding or Treatment
Chemically Contaminated Water Systems
Civil Works
Dairies and Cold Storage Plants
Film Laboratories
Fire Systems
Food Processing, Restaurants, Bakeries, slaughterhouse
Hospitals, Medical Buildings, Sanitariums, Morgues, Mortuaries, Funeral Homes,
Autopsy
Facilities, Nursing and Convalescent Homes and Clinics
Irrigation Systems
Laundries and Dye Works
Metal Manufacturing, Cleaning, Processing and Fabricating Plants
Motion Picture Studios
Multi-family dwellings, apartment buildings, condominiums
Multi-storied Buildings
Multiple Services
Oil and Gas Production, Storage or Transmission Properties
Paper and Paper Products Plants
Plating Plants
Power Plants
Radioactive materials or Substances, Plants or Facilities Handling
Restricted, Classified or other Closed Facilities
Rubber Plants, Natural or Synthetic
Sand and Gravel Plants
Schools and Colleges
Sewage and Storm Drain Facilities, Reclaimed Water
Solar Heating Systems, Direct and Auxiliary
Swimming Pools
Temporary Service
Used Water
Waterfront Facilities and Industries, Marinas
-------
SECTION 111 - MSKEL^M-gREMEMgM^SSEMBLJES
A. AQQEOMBfiLBaclgflpw Prevention AssemMsg.SlQ.r,C,Qntjai,n,m,e,nf
1. An approved backflow prevention assembly installed for containment
purposes must be approved by the University of Southern California-
Foundation for Cross Connection Control and Hydraulic Research. The
approval listing shall include the assembly's limitations based on the
degree of hazard and the assembly shall be listed by the International
Association of Plumbing and Mechanical Officials (IAPMO) or the
American Society of Sanitary Engineering (ASSE).as having met the
requirements of one of the standards listed below.
Standard Product Covered
ANSI/ASSE 1013-1999 Reduced Pressure Principal Backflow Preventers
ANSI/ASSE 1015-1999 Double Check Backflow Prevention Assembly
ANSI/ASSE 1047-1999 Reduced Pressure Detector Backflow Preventer
ANSI/ASSE 1048-1999 Double Check Detector Assembly Backflow Preventer
2. An approved backflow prevention assembly installed for containment
purposes on a fire protection system must meet the requirements of the
Factory Mutual Research Corporation (FM) and Underwriters Laboratory
(UL) in addition to the requirements stated above.
B. Backflow PreveiJm^i^^
1. Installation will be in accordance with all applicable plumbing codes. The
assembly should be located as close to the meter as practicable, on the
customer's side, and before any branching occurs, with the exception of
underground sprinkler systems and boilers where the assembly may be
installed on the branch line serving the sprinkler system/boiler. The
customer must not remove the meter. The assembly must be installed by
a Qualified Backflow Assembly Installer.
-------
2. Backflow prevention assemblies shall be located in an area that provides
a safe environment for testing and maintenance. The area should be
easily accessible, dry, and free from dirt/debris, extreme cold, heat, and
electrical hazards. Also, if water which may be discharged from these
assemblies could cause damage, it should be piped via an air gap to a
drain or other suitable location.
3. If an uninterrupted supply of water is required to a facility, backflow
assemblies must be installed in parallel to allow for testing and
maintenance.
4. A pressure loss through the backflow prevention assembly will be
experienced by the customer. The pressure reduction varies with the size
and type of assembly installed. The customer will be responsible for
providing any increase in pressure required as a result of the pressure
loss through the backflow prevention assembly.
Installation of a backflow prevention assembly will create a closed
system. Therefore, pressure buildups as a result of heating or other
means will not be alleviated through this assembly. Customers should be
advised of this and the need for a temperature/pressure relief valve or
expansion tank within their system.
5. The need for replacement of existing backflow prevention assemblies that
do not meet all of the above installation requirements will be determined
by the Water Company on a case by case basis.
C. Backflow Prevention Assembly Testing and Maintenance
1. The owner(s) of any premises on which, or on account of which, a
backflow prevention assembly is installed, shall be responsible for having
the assemblies tested by a Qualified Backflow Assembly Tester. A
backflow prevention assembly shall be tested after installation, relocation
or repair, and annually thereafter, unless more frequent testing is required
by applicable state/local regulations. The Water Company may require a
more frequent testing schedule if determined to be necessary. No
assembly shall be placed in service unless it is functioning as required
-------
and an assembly shall be serviced, overhauled, or replaced whenever it
is defective,
2. The Water Company will notify affected customers by mail when annual
testing of an assembly is needed and also supply the affected customer
with the necessary form that shall be completed each time an assembly is
tested, relocated, or repaired.
D. Backflow Prevention AssemjbJyJielfii^iQn, Repgir, or Replacement
1. Approval must be obtained from the Water Company before a backflow
prevention assembly is relocated or replaced.
i. Relocation: An assembly may be relocated following confirmation
by the Water Company that the relocation will continue to provide
the required protection and satisfy installation requirements.
Removal and reinstallation of the assembly must be done by a
Qualified Backflow Assembly Installer. A test is required following
the relocation of the assembly.
ii. Repair/Replacement: An assembly may be removed for repair or
replacement, provided the service line is shut off and water use is
discontinued until the repair/replacement is completed and the
assembly is tested and found to be operating correctly.
Alternatively, the service connection may be equipped with other
temporary backflow protection, approved by the Water Company,
if continuous service is required. Repair or replacement of the
assembly must be done by a Qualified Backflow Assembly
Installer. All replacement assemblies must be approved by the
Water Company and must be commensurate with the degree of
hazard present. A test is required following the repair or
replacement of the assembly.
-------
SECTION IV-TERMINATION FOR NON-COMPjUANCE
When the Water Company encounters a water customer connection that represents a
clear and immediate hazard to the public water supply, and the hazard cannot be
immediately abated, the Water Company shall immediately institute the procedures for
discontinuing the water service. The Water Company will notify the water customer of
the reasons for discontinuing the water service and the corrective action will be taken by
the water customer before service can be restored. This will be done in accordance with
all applicable customer service rules and regulations.
Conditions for water use that create a basis for water service termination shall include,
but are not limited to, the following items:
1. Refusal to install a required backflow prevention assembly
2. Refusal to test a required backflow prevention assembly
3. Refusal to repair a fa4-lty, required backflow prevention
assembly
4. Refusal to replace a faulty, required backflow prevention
assembly
5. Direct or indirect connection between the public water
system and a sewer line
6. Unprotected direct or indirect connection between the
public water system, and a system or equipment
containing contaminants
7. Unprotected direct or indirect connection between the
public water system and an auxiliary water system.
8. A situation that presents an immediate health hazard to the
public water system.
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RIVERDALE ZONING DISTRICTS
CITY OF RIVERDALE
SCOTT COUNTY, \OW
R-1 SINGLE FAMILY
M-1 LIGHT INDUSTRY
m SOURCES:
BASE DATA PROVIDED BY SCOTT COUNTY SOT Y OF RIVERDALE
R-2MULTI FAMILY
M-2 HEAVY INDUSTRY
C-1 COMMERCIAL
C-2 COMMERCIAL
l l l
0 750 1,500
i;
I
LU
Prises &f. sjsrssi File: 5D«FSHPiij«ts's!s DAT/TOEM^rrroWM/SlMi: CITY 0P4(>|»\SBissJe Zeros PaM m 11i£l7.riS[a
Print Dale: 11:33:36 AM 11/152014
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4/3/2017
Hazardous Waste Sites Registry
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IOWA DEPARTMENT OF
NATURAL RESOURCES
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HAZ WASTE SITES REGISTRY
Hazardous Substance Remedial Fund and Sites Registry
The Hazardous Substance Remedial Fund and Sites Registry fulfill obligations under Sections
455B.424, 455B.426 and 455B.427 of the Code of Iowa. These sections require a full accounting to
the Legislature and the Governor regarding the Hazardous Substance Remedial Fund and a report
regarding sites listed on the Registry of Hazardous Waste Disposal Sites each January. The web
site is updated as new information becomes available throughout the year. This report and
reports for prior years are available by contacting Matt Culp at 515-725-8337 or
Matt.Culp@dnr.iowa.gov.
The Iowa Legislature adopted the following subsections to manage the Registry, effective July 1,
2011:
Sec. 5. Section 455B.426, Code 2011, is amended by adding the following new subsections:
SUBSECTION 3. Beginning July 1, 2011, a new site shall not be placed on the registry of confirmed
hazardous waste or hazardous substance disposal sites.
SUBSECTION 4. A site placed on the registry of confirmed hazardous waste or hazardous
substance disposal sites prior to July 1, 2011, shall be removed upon the execution of a uniform
environmental covenant pursuant to the provisions of chapter 4551 relating to the contaminated
portions of the property listed on the registry. A site may also be removed from the registry
pursuant to section 455B.427, subsection 4. More information can be found on our Environmental
Covenants page.
SUBSECTION 5. If no sites remain listed on the registry of confirmed hazardous waste or
hazardous substance disposal sites, the department shall recommend to the general assembly
the repeal of this section and sections 455B.427 through 455B.432.
The purpose of these amendments is to transition the state to the use of uniform environmental
covenants for the management of hazardous waste disposal sites in Iowa. Iowa Code Chapter
4551, the Uniform Environmental Covenants Act, was adopted in 2005 and provides a mechanism
for the protection of human health and the environment from harms arising from hazardous
waste or hazardous substance disposal sites. New sites have not been added to the Registry since
1995. These amendments provide for a process to allow for the removal of the remaining sites
from the Registry either through remediation or the establishment of an environmental covenant.
http://www.iowadnr.gov/Environmental-Protection/Land-Quality/Contaminated-Sites/Haz-Waste-Sites-Registry
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Hazardous Waste Sites Registry
Restriction on the Sale and Change in Use of Property
When a site is listed on the registry, a notice of listing is recorded in the county recorders office
and becomes part of the chain of title. Iowa Code section 455B.430 prohibits (1) any
"substantial change" in the use of the property without prior written approval by the director of
the IDNR; and (2) any sale, conveyance or transfer of title to the property without the director's
prior approval. Property owners should submit a written request for approval to the director of
the IDNR explaining the planned change in use or the proposed sale of the property. The director
is required to respond within thirty days. Property owners may appeal an adverse decision of the
director and request an administrative hearing. See Iowa Code section 455B.430(3)
If the director has reason to believe there has been a substantial change in use or sale without
prior approval, he may file an action in Iowa District Court to enjoin the activity and assess a
penalty up to $ 1,000 per day of violation.
Registry of Hazardous Waste Disposal Sites
The department maintains an assessment file for each site listed in the Registry. These files are
available through the Iowa DNR Records Center in Des Moines, Iowa. Individual site records may
also be accessed through the contaminated sites database . For most sites, these files contain a
summery of comprehensive site investigations. The site information package contains a detailed
review of the site and is used as the basis for listing and classifying the sites in the Registry.
However, not all the known hazardous waste or contaminated sites that exist in the state are
listed on the Registry. Contact Matt Culp at 51 5-725-8337 or Matt.Culp@dnr.iowa.gov for further
information regarding specific locations or sites.
¦ Registered Sites by County
¦ Registered Sites by Name
Classi-cation Categories
All sites listed on the Registry are classified according to the relative priority listing for remedial
action at the site. During the initial listing, the site must be placed in one of the first four
classifications ("a", "b", "c", or "d"). While a site is listed on the Registry, its classification can be
changed because of site cleanup activities or because of new information about the site. The five
classification categories are specified in Section 455B.427.3 of the Code of Iowa
¦ Classification Categories
¦ One reclassifications for 2016
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To conserve and enhance our
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organizations
to improve the quality of life in
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Customer Service: 515-725-8200 | Iowa DNR Headquarters Wallace State Office Building
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http://www.towadnr.gov/Environmentel-Protection/Lancl-Qualtty/Contaminated-Sites/Haz-Waste-Sles-Regi8try
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ALUMINUM COMPANY OF AMERICA (ALCOA)
(Riverdale, Iowa)
GENERAL DESCRIPTION
The ALCOA site is located in Sections 23, 24, 25, and 26 of Township 78N, Range 4E, Scott County, Iowa. The site
occupies 445 acres adjacent to the Mississippi River Pool #15 (MRP15). ALCOA is the owner of record. The site was
entered on the Registry in November 1990.
SITE CLASSIFICATION
The site is classified "d" closed requires further management
TYPE AND QUANTITY OF HAZARDOUS WASTE
• The primary type of hazardous waste: polychlorinated biphenyls (PCB's) and tetrachloroethylene (PCE)
The ALCOA facility produces rolled aluminum plate, sheet, and foil and historically used an unlined waste oil surface
impoundment located approximately 150 feet from the Mississippi River for disposal of oil and grease, pickling fluids,
solvents, and paint wastes. In 1979, ALCOA determined the waste oil in the impoundment was contaminated with
PCBs. In 1981, ALCOA removed 2.8 million gallons of waste oil and sludge from the impoundment. Some waste was
disposed off-site and the remaining sludge was solidified in place with cement kiln dust to control PCB releases.
ALCOA installed groundwater monitoring wells around the perimeter of the impoundment. The monitoring indicated
improvement; however, additional action was determined to be necessary. In August 1989, ALCOA informed the EPA
of additional PCB problems in the soil and groundwater. In December 1989, ALCOA informed the Iowa Department of
Natural Resources (IDNR) of a PCE contamination of undetermined volume in the area around two PCE storage tanks
SUMMARY OF PUBLIC HEALTH AND ENVIRONMENTAL CONCERNS
• The primary environmental concerns at this site are water quality of surface water (the Mississippi River),
groundwater, and detrimental effect on flora and fauna of the Mississippi. The primary public health
concerns are possible exposure to contaminated soil, groundwater, and consumption of fish containing
contaminants.
Under the terms of a 1984 Administrative Order of Consent (AOC), a cut-off trench was installed to collect groundwater
containing oil from the impoundment from reaching the Mississippi River. In addition, the impoundment (with
remaining stabilized sludge) was capped with a low permeability compacted clay.
From 1983 to 1987 fish tissue and river sediment studies were conducted in Mississippi River Pool 15 (MRP15). The
IDNR evaluated this data and issued a Fish Consumption Advisory in June 1989. This advisory notified the public that
Common Carp in MRP15 could contain levels of PCBs above the U.S. Food and Drug Administration (FDA) tolerance
level of 2 parts per million (ppm or mg/kg). In April 1990, the IDNR issued a second fish consumption advisory for
carpsuckers (Carpiodes spp., also referred to as "white carp"). The Fish Consumption Advisories recommended not
eating Common Carp or carp suckers taken along the Iowa side of the MRP15.
In July 1990, the EPA and ALCOA signed another AOC requiring additional fish and sediment studies in MRP 15 and in
the outfalls from the ALCOA facility to the river. Fish sampling events were conducted by ALCOA contractors in 1990,
1992,1994,1996, and 1998. The analytical results for the sampling events documented declining levels of PCBs in fish
from MRP15. In August of2000, the IDNR lifted the Fish Consumption Advisories for carp and carpsuckers because
PCBs in Common Carp were below the tolerance limit of 2 ppm of total PCBs in both the 1996 and 1998 samplings.
In 2006, Iowa DNR, with assistance from the Iowa Department of Public Health, developed a new consumption
advisory protocol. This protocol contained three levels of advisory: (1) no restriction on consumption, (2) no more than
-------
one meal per week, and (3) do not eat. While the "do not eat" threshold for total PCBs remained the FDA Action Level
of 2.0 mg/kg, the threshold for a one meal per week advisory was set at 0.2 mg/kg. Sampling by Iowa DNR in 2006
showed that levels of total PCBs in MRP15 Common Carp were below the one meal per week advisory threshold of 0.2
mg/kg.
EPA sampling in MRP15 in 2012, however, showed that, while levels of total PCBs remain low in MRP15 fish, levels
of total PCBs in large Common Carp tended to exceed both the EPA performance standard of 0.231 mg/kg and the Iowa
DNR/Iowa Department of Public Health's threshold of 0.2 mg/kg for a one meal per week consumption advisory.
Based on EPA recommendations, Iowa DNR's ambient fish tissue monitoring program has long specified that samples
of Common Carp collected for tissue analysis should be between 12 and 21 inches (305 to 533 mm). The Common
Carp from EPA's 2012 sampling with levels greater than 0.2 mg/kg ranged in size from about 23 inches up to 29.5
inches (580 to 750 mm ), thus far exceeding Iowa DNR's upper length limit of 21 inches (533 mm). Based on the new
(2012) information from EPA, Iowa DNR conducted confirmation sampling of large Common Carp in MRP15 in 2013
and 2014. Results of monitoring in 2014 showed a level of total PCBs of 0.42 mg/kg in a composite sample of fillets
from three Common Carp that averaged 678 mm (26.7 inches) in total length. This information was used by Iowa DNR
to issue a one meal per week consumption advisory for Common Carp from MRP15.
No PCB contamination has been found in the bedrock aquifer. However, chlorinated solvents (PCE, trichloroethylene,
1,2-dichloroethlyene, and vinyl chloride) have been found in monitoring and process water wells at concentrations well
above drinking-water standards.
SUMMARY OF ASSESSMENT. MONITORING OR REMEDIAL ACTIONS
The EPA is the lead agency for this site under the Comprehensive Environmental Response, Compensation, and
Liability Act program.
The EPA and ALCOA signed an Administrative Order on Consent in August 1995. This AOC established a process
(Overview of Cleanup Strategy) by which ALCOA will evaluate and assess 81 additional areas of potential
contamination and, if necessary, conduct removal actions.
In 2002, ALCOA completed a site-wide groundwater remedial investigation that concluded that the production well
PW-6 is containing groundwater contamination and substantially preventing off-site migration of contaminants. PW-6
has been in continuous operation since 1989 as a recovery well for containment of groundwater contamination. Water
from PW-6 is treated prior to discharge to the Mississippi River.
In 2004, the EPA issued a Record of Decision (ROD) for groundwater contamination at the ALCOA property as well as
for sediment and aquatic contamination of MRP15. The ROD called for: continued operation of the groundwater
treatment system, institutional controls to prevent installation of on-site drinking water wells, and continued use of the
property for industrial purposes only and monitoring of groundwater, river sediment and fish (tissue).
In 2009, the EPA entered into a Consent Decree with ALCOA to prepare and implement remedial design/remedial
action (RD/RA) in accordance with the 2004 ROD. Since 2013, Alcoa has continued with implementation and
operation of the remedial action in accordance with the RD/RA work plan.
2014: Implementation of a Long-Term Monitoring Plan (LTMP) and the Groundwater Containment, Extraction and
Treatment System (GCETS)
2015: Quarterly groundwater monitoring has been performed as outlined in the LTMP. The GCETS has removed and
treated approximately 119,849,000 gallons of water between October 2014 and September 2015.
2016: EPA and The Army Corp of Engineers initiated the Five Year Review.
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tCF KAISER ENGINLLRS
Map of ALCOA facility
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(Aluminum Company of America)
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Page 1 of 10
r;iE Of sowa. scon county, ss
I. "T4. A, VARGAS, SCC7T COUNTY RECORDER
=- 1"Vf CERTIFY THE ATTAC1 ;ED TO BE A TRUE
•\:*D CORRECT COPY OF SAID RECORD,
F.ECDRDEO IN THE OFFICE OF RECORDER OF
DEEDS SCOTT COUNTY, IOWA
DATED _
APR 2 9 2019
aiL
RECOPDER
Prepared by: Environmental Protection Agency Region 7,
Superftind Division
11201 Runner Bivd
Lenexa. KS 60219
Doc ID: 021937250010 Type; LAN
Recorded: 04/05/2019 at 02:32:38 PI1
Fee Amt: $52.00 Page 1 of 10
Scott County Iowa
Rita A. Vappas Recorder
^.2019-00007512
Return to: Arconic Davenport Works
Guilbert Ebune
4879 State Street
Bettendorf, LA 52722
ENVIRONMENTAL COVENANT
This Environmental Covenant is established and executed, pursuant to Iowa
Code chapter 4551 by Arconic Inc., a Delaware corporation, who has a mailing address
of 201 Isabella Street, Pittsburgh, PA 15212,
The signatories hereto have entered into this Environmental Covenant for the
purpose of subjecting the property described below to certain activity and use limitations
in accordance with the terms and conditions specified below and the provisions of Iowa
Code chapter 4551.
1. The Property, Arconic Inc. (formerly Alcoa Inc.) is the fee simple title
owner of that real properly legally described m ExMbttA hereto, and located south of
Highway 67 in Riverdale, Scott County, Iowa (the "Property"),
2. Purpose. Because contamination will remain at the Property at levels above
those appropriate for unlimited use and unrestricted exposure, this Environmental
Covenant Is being imposed on the Property for the purposes of protecting public health
and the environment, and to prevent interference with the performance, and the operation
and maintenance, of any environmental response project required under the terms of the
below-referenced Consent Decree. The signatories acknowledge that failure of these
activity and use limitations to serve their intended purpose of preventing exposure to
contamination at the Property could require the performance of additional work by
Arconic Inc. at the Property, in accordance with the Consent Decree, to ensure the
protecfiveness of the environmental response project.
3, Background. Arconic lac. (then known as Alcoa Inc.) conducted a Remedial
Investigation r'RI"), which was approved by EPA on Inly 31, 2002, and a Feasibility
Study C"FSB), which was approved by EPA on November 23,2004, to address
groundwater contamination at the Property. On September 28, 2004, the EPA issued a
Record of Decision ("ROD") which selected an environmental response project to
address contamination in the groundwater at the Property, The ROD included
institutional controls as part of this environmental response project Arconic Inc. (then
known as Alcoa Inc.) entered into a Consent Decree, Civil Action Number 3:08-cv-
00096-RP-CFB, with the United States which is on file in the United States District
Court for the Southern District of Iowa, Davenport Division, which provides for the
imposition of the activity end use limitations required hereby. The ROD (and any
amendments or modifications thereto) constitute the final decision document for the
environmental response project required by the Consent Decree to be implemented at the
Property. The ROD and the administrative record for the ROD may be reviewed at the
offices of She U.S. Environmental Protection Agency at the address specified in Section
Fife Number 2019-00007£JQ82d<$)1l8
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Page 2 of 111
4. Identity., of .Grantor, Grantee/Holder. and. Agency, as clcli is.defiwed.in
tMsJMfrantnenfal Covenant..and .as provided in Towa's Uniform Environmental
Grantor: A/conic Inc. is the current oxvncr of the Property t-.nd
the Grantor of this Environmental Covenant.
Grantee/Holder: Arconic Inc. is the Grantee/Holder of this
Environmental Covenant.
Agency: The Iowa Department of Natural Resources (DNR) and the
U.S. Environmental Protection Agency (EPA) are each an
Agency under this Environmental Covenant.
5. Representations and Warranties, Arconic Inc. warrants to DNR and EPA
the following:
A. that it is the sole fee simple title owner of the Property;
B. that it holds sufficient fee simple title to the Property to grant the rights and
interests described in this Environmental Covenant free of any conflicting iegal
and equitable claims; and
C. that it has identified all other persons holding legal or Equitable interests to the
Property, including, but not limited to, contract buyers, mortgagees, other
consensual lien holders, and lessees and secured their consent to this
Environmental Covenant either by obtaining their signatures hereto or by a
separate subordination agreement attached hereto as an Exhibit.
6. Running with the Property. This Environmental Covenant is perpetual and
runs with the Property as provided in Iowa Code chapter 4551 until modified or
terminated as provided below in Section 11. This Environmental Covenant is binding on
Arconic Inc. and all of Arconic inc.'s successors, assigns, and all transferees acquiring
or owning any right, title, lien or interest in the Property and their heirs, successors,
assigns, grantees, executors, administrators; and devisees. The terns "transferee," as used
in this Environmental Covenant, shall mean any future owner of any interest in the
Property or any portion thereof, including, but not limited to, owners of an interest in fee
simple, contract buyers, mortgagees, easement holders, and/or lessees.
7. Activity and Use Limitations and Terms. The Property is subject to the
following activity and use limitations:
A. the Properly shall be used only for industrial uses or purposes;
B. installation of drinking water wells on or in the Property is prohibited; and
File Number: 2019-00007512 Seq. 2
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Page 3 of if)
C. groundwater taken from beneath the Property shall no: be used for domestic
purposes such as drinking, cooking or bathing or as a source for irrigation of
agricultural crops.
8. Notice of Non-Compliance. Arconic Inc. and any subsequent transferee of the
Property shall notify DNR. and EPA as soon as possible of any c on d it inns that would
constitute a breach of the activity and use limitations specified above in Section 7.
y. Notice to Lessees, Arcomc Inc., any holder with a property interest sufficient to
grant a lease of the property, and any subsequent transferee shall incorporate the activity
and use limitations of this covenant either in full or by reference to this instrument in any
[case, license, or other instrument granting a right to possession of the property.
10.Access to the Property Reasonable access to the Property is hereby granted to
DNR and EPA, and their authorized representatives. Access shall be granted to any private
party or its contractors which may be required by law or authori?ed by DNR or EPA to
conduct environmental activities at the Property io ascertain or ensure the effectiveness of the
environmental response project. These activities may include, but are not limited to, repair
and maintenance of response project equipment, soil caps, groundwater monitoring wells and
associated aboveground or subsurface structures, and fencing and other technological
controls. To determine Property conditions and compliance with the terms of this
Environmental Covenant, access may include groundwater sampling and monitoring,
additional drilling and construction of soil borings and/or groundwater monitoring wells and
other activities authorized or otherwise directed by DNR or EPA. Parties granted access to
the Properly must abide by the Health and Safety requirements of Arconic Inc. or transferee.
11. Groundwater Hazard Statement. Iowa Code, section 558.69 requires
submission of a groundwater hazard statement and notice if "hazardous waste"; as defined in
Iowa Code sub-section 455B.411(3) is present on real property. If hazardous waste, is
present, the groundwater hazard statement must state th
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Page 4 of 111
recorded,
13. Enforcement The terms of this Environmental Covenant may be enforced in a
civil action for injunctive or other equitable relief by the signatories and those persons
authorized by and in accordance with Iowa Cede chapter 4551,
14. Severability. If any provision of this Environmental Covenant is found to be
unenforceable in any respect, the validity, legality and enforceability of the remaining
provisions shall not in any way be affected or impaired.
15. Governing Lnw. Tills Environmental Covenant shall be governed by and
interpreted in accordance with the laws of the state of Iowa.
16. Recordation, Within thirty (30) days following execution of this
Environmental Covenant by ail parties hereto, Grantor shall properly record this
Environmental Covenant with the Scott County, Iowa, Recorder/Registrar Office.
17. Effective Pate. The effective date of this Environmental Covenant shall be die
date upon which the ftilly executed Environmental Covenant has been properly recorded
with the Scott County, Iowa, Recorder/RegistrarOffiee,
18. Notice. Unless otherwise notified in writing by an Agency, any document or
notice required by this Environmental Covenant shall be submitted to:
Director
Iowa Department of Natural Resources
Wallace State Office Building
Des Moines, Iowa 50319 and
Director, Supcrftind Division
U.S. Environmental Protection Agency
i 1201 Renner Boulevard
Lenexa, Kansas 66219
File Number: 2019-00007512 Seq 4
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Exhibit A
LEGAL DESCRIPTION
Arconic Property Located South of Highway 67 in Riverclaie, Iowa
Arconic owns the following described property located in Sections 23,24, 25 and 26, Township 78
North, Range 4 East of the Fifth Principal Meridian in Scott County in the State of Iowa:
TRACT 1 A tract of tend situated in Section 23, commencing at the Southwest Corner of the Southeast
Vi, said point being the point of beginning, and running North to U.S. Highway 67, thence Northeasterly
along the Southerly boundary of U.S. Route 67 to the midpoint of said Southeast V, of Section 23,
thence North 90" East to the Eastern boundary of Section 23, thence South 0" West to the Southwest
corner of said Section 23, thence South 90° West to the point of beginning; excepting therefrom the
tract conveyed to the Davenport, Rock Island & Northwestern Railroad by instrument dated March 1,
1949;
and
TRACT 2 The Northeasts of Section 26, including the Southeast portion of said Northeast %A that is
submerged in the Mississippi River; excepting therefrom the tract conveyed to the Davenport, Rock
Island & Northwestern Railroad by instrument dated March 1,1949;
and
TRACT 3 A portion of the Northwest % of Section 26 beginning at the midpoint of said Section, thence
North 0° West to the Southerly boundary of the tract conveyed to the Davenport, Rock Island &
Northwestern Railroad by instrument dated March 1,1949, thence running Southwesterly along the
Southern boundary of said tract to the Northerly boundary of South Bellingham Road, thence
Southeasterly along said Northerly boundary of South Bellingham Road to East-West center line of
Section 28, thence South 90° East along said East-West center line to the point of beginning; excepting
therefrom a tract owned of record by Iowa-Illinois Gas and Electric Company and described as follows:
commencing at the midpoint of the Northeast V* of Section 26, such point being the point of beginning,
thence South 52°26'30" East 240 feet, thence South 37B33'30" West 344,6 feet, thence North 52*26'30"
West 240 feel, thence North 37°33'3D" East 344.80 feat to the point of beginning;
and
TRACT 4 A tract of land situated in Sections 24, 25 and 26, commencing at the midpoint of Section 26,
being the point of beginning, thence North 90" West to the Easterly line of South Bellingham Road,
thence Southeasterly along South Bellingham Road to the Northwesterly boundary of the tract formerly
owned by the Davenport, Rock Island and Northwestern Railroad and conveyed to the Aluminum
Company of America by instrument dated March 1,1949, thence Southwesterly along the Northwesterly
boundary of said former Davenport, Rock Island & Northwestern Railroad tract to the Northerly line of
the Southwest % of the Southwest % of Section 26, thence South 90' West to the Northwest Corner of
the Southwest V« of the Southwest % of Section 26, thence South 0® West to the southerly boundary of
said former Davenport, Rock Island and Northwestern Railroad trad, thence northeasterly along the
southerly boundary of said former Davenport, Rock Island and Northwestern Railroad tract to the
northeasterly boundary of the tract currently owned by Magellan Pipeline terminals LP., thence South
40° East 2,020 feet, thence Northeasterly along the shore of the Mississippi River 1,336.2 feet, thence
South 51 ®33' East 270 feet along a line commonly known as the wharf line of the Mississippi River,
thence North 40*46' East 2,985 feet along said wharf line, thence Nolt'n 51 °38' West 810 feet, thence
North 42°28' East 1,510 feet, thence North 40°21' East 150 feet, thence North 0°54'20" West 399.41
feet, thence North 49°58'20" West 1,153.45 feet to the North line of the Southwest^ of the SouthwestK
of Section 24, thence North 90° West along the North line of said Southwest % of the Southwest % of
Section 24 fo the Easterly line of the property conveyed to the Davenport, Rock Island and
Northwestern Railroad by instrument dated November 12,1940, thence South 1 D°3T West 403.1 feet,
thence South 49*44' East to the Northwestern comer of the tract conveyed to Aluminum Company of
America by deed dated May 27. 136S, thence South 59*36'10" West to the Southeast corner of a tract
conveyed to Iowa Illinois Gas & Electric Company by instrument dated January 5,1942, thence North
File Number: 20 19-00007512 Seq
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56°45'30" West to the Section fine between Sections 23 and 24, thence South 0° West to the Southeast
Corner of the Northeastof Section 26. thonce South 90" West to the point of beginning;
All of the above being subject to all covenants and easements of record.
LEGAL DESCRIPTION
Arconic Owned Lots atony Bellingham Street
TRACT 5 Part of Seciion 26, Township 78 North, Range 4 East of the 5th P.M. in the City of Riverdate,
Scott County, iowa, more particularly described as follows:
Commencing at a point 93 8 feet South of the Northwest comer of Section 26; thence South 40 degrees
7 minutes East 875.6 feet to a point in the center of the Davenport and LeCiaire Highway (U.S. Highway
#67); Thence South 40 degrees East along the Southwesterly Right-of-way line of Bellingham Street
688.2 feet to the point of beginning; Thence South 40 degrees East S6D.0 feet along the said
Southwesterly Right-of-way line of Beliinghanl Street; Thence South 40 degrees 10 minutes West
172.1 feet parallel with the said highway: Thence North 40 degrees West 660 feet; Thence North 40
degrees 10 minute East 172.1 feet to the point of beginning. This parcel contains 2,81 acres, more or
less.
and
TRACT 8 Part of Section 26, Township 78 North, Range 4 East of the 5th P.M. in the City of Riverdate,
Scott County. Iowa, more particularly described as follows:
Commencing at a point 938 feet South of the Northwest comer of Section 26; thence South 40 degrees
7 minutes East 875.5 feet (o a point in the center of the Davenport and LeCiaire Highway (U.S Highway
#67); Thence South 40 degrees East along the Southwesterly Right-of-way line of Bellingham Street
1408.2 feet to the point of beginning; Thence South 40 degrees East 120.0 feet along the said
Southwesterly Right-of-way line of Bellingham Street to the Northwesterly Right-of-way line of the
former D.R.I. & N.W. Railway; Thence South 40 degrees 10 minutes West 172/1 feet along the said
Northwesterly Right-of-way iine of the former D.R.L 6 N.W. Railway: Thence North 40 degrees West
120.0 feet, Thence North 40 degrees 10 minutes East 172.1 feet parallel with said Railway to the point
of beginning. This parcel contains 0.47 acres, more or less.
File Number: 2019-00007512 Seq
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Page 7 of 10
SHIVEHATTERY
architectljre + engineering
ICM"S | DlWs | M&SdUfl http./A«B.L*\!ra-nqU«ry£am
rturrt»5 ram st]M6D1 1&*~OOOXH
File Number: 2019-00007512 Seq: 7
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P.age S of in
GRANTOR/GR ANTEEMOLDER:
ARCONIC, INC
ft>b .V 2019
By: MH^JfrfcuWtR.,
Title: "p-'AjN t fc
State of Tow A- )
Connty of
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Page 9 of 10
AGENCY;
(OWA DEPARTMENT OF NATURAL RESOURCES
,2019
Bruce Trautmait
Acting Director, Iowa Department of Natural
Resources
Slate of
County of
On this _ _±iL day of 2019, before me personally appeared
Bruce Trainman, known to nie to be the Acting Director of the fowa Department of Natural Resources
or the lawful designee of fee Acting Director who executed the foregoing instrument, and acknowledge
that this person executed the same as his/her/their voluntary act and deed.
%
Notary Public, StateMM
KAREN FYNAARDT
COMMISSION NO, IBS 24 9
W COMMISSION &PIP.ES
JANUARY 13.
File Number: 2019-00007512 Seq; 9
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Page 10 of 10
AGENCY:
U.S. ENVIRONMENTAL PROTECTION AGENCY
3llAiL _»2019
' By: Mary P. Pk'erson, Director
Superfund Division
Sfate of Kansas J
County of Johnson ) ss.
On thisrQlfl^Xiay of iAdCfk 2019, before me personally appeared
Mary P. Peterson, the Director of the Superfund Division of Region 7 of the U.S. Environmental
Protection Agency, who being duly sworn, did sign this Environmental Covenant.
ClGtyl if> vi-', •. „• "
Notary Public,(Sfate of Kansas
MILADY R PETERS,
EWP My Appl. giipiffg ,\Q/
File Number: 2019-00007512 Seq: 10
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Registry of Hazardous Waste or Hazardous Substance Disposal Sites
Site(s) reclassified or removed in 2017:
Reclassified:
Iowa Falls Coal Gas located in Iowa Falls, Iowa is reclassified from the status of "b"
Significant threat to the Environment to "d" Site Closed, Requires Continued
Management
Monsanto Company located in Muscatine, Iowa is reclassified from the status of "b"
Significant threat to the Environment to "d" Site Closed, Requires Continued
Management
Removed:
Atlantic Coal Gas located in Atlantic, Iowa
Mason City Coal Gas located in Mason City, Iowa
Northwestern States Portland Cement Co located in Mason City, Iowa
Peoples Natural Gas located in Dubuque, Iowa
State of Iowa (A.Y. McDonald Manufacturing) located in Dubuque, Iowa
Williams / (Magellan) Des Moines Terminal located in Des Moines, Iowa
Aluminum Company of American (ALCOA) located in Davenport, Iowa
www.io wadnr. gov
updated 12/2013
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