SECOND FIVE-YEAR REVIEW REPORT FOR

ALUMINUM COMPANY OF AMERICA - DAVENPORT
SUPERFUND SITE

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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

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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

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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).

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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.

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EXFlAVADSN

6001-=

/ rx st

0O1-PO1U

I

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11

mallow bedrock woiiTonao

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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

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APPENDIX D
SITE INSPECTION

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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

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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

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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

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~ 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:

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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

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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:

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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:

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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:

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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

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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

-------
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

-------
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

-------
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

-------
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
Ch

nng 5taiian

Radio |
Towers]

^ Sto«-Communi(v
• College

Radio
Towers

Riuerdale

Rivetcfate
Park

Sj'Pquvefpfant

' 490
'BELI.S ISLAND
SI ATE PARK

Winnebago*
7 Island ikd

l TraiTSr
N/ar*'s

Trailer
Park /

vVT ^

Source: U.S.G.S Topographic Map

Silvis, Ill-Iowa Quadrangle, 41090-E4-TT'-024,1991

Scale: 1"=2000'



JL







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

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Figure 4-46

-------
PA-14S VOC Trend Chart

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Figure 4-47

-------
PA-17S VOC Trend Chart

eto

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Figure 4-48

-------
LNIVOC Trend Chart

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Figure 4-49

-------
Figure 4-50

Trends in Channel Catfish PCB Data - MRP15 Site

1200

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*?

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+*

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800

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Mean

1

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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

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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

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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

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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

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•	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

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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

Agencies Online Services

Search All of lowa.gov...

IOWA DEPARTMENT OF
NATURAL RESOURCES

~

DNR Online Services | Subscribe to Email Updates
News | Events | Contact Us

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

Our Mission

To conserve and enhance our
natural resources in cooperation
with individuals and
organizations

to improve the quality of life in
Iowa

and ensure a legacy for
future generations.

DNR Home
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Hazardous Waste Sites Registry

MAGAZINE

Customer Service: 515-725-8200 | Iowa DNR Headquarters Wallace State Office Building
! 502 East 9th Street, 4th Floor | Des Moines, IA 50319-0034

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

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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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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

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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