summary of groundwater monitoring data collected during … · 2016-07-12 · i i i i i i i i i i i...

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SUMMARY OFGROUNDWATER MONITORING DATACOLLECTED DURING 1995 FOR THE

ALCOA-DAVENPORT WORKSRTVERDALE, IOWA

Submitted to

Aluminum Company of AmericaRiverdale, Iowa

March 1996

Prepared by

Geraghty & Miller, Inc.4700 Lakehurst Court, Suite 100

Dublin, Ohio 43016(614)764-2310

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ALCOA-DAVENPORT WORKSRTVERDALE, IOWA

March 5,1996

Prepared by GERAGHTY & MILLER, INC.

Li chard O. As tieStaff Scientist/Task Manager

lice Waldhaueri *

Project Coordinator/Project Manager

Lawrence S. Graves, CPGVice President/Project Officer

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CONTENTS

Page

1.0 INTRODUCTION 1

2.0 DATA COLLECTION PROCEDURES 12.1 MEASUREMENT OF WATER-LEVELS AND FLUID-LEVELS 1

2.1.1 Site-Wide Bedrock Locations 12.1.2 Former Waste Disposal Site 2

2.2 WATER-QUALITY SAMPLING 32.2.1 Site-Wide Bedrock Locations 32.2.2 Former Waste Disposal Site 4

2.3 MONTHLY PRECIPITATION AND PUMPING DATA 5

3.0 RESULTS AND DISCUSSION 13.1 WATER-LEVEL AND FLUID-LEVEL MEASUREMENTS 1

3.1.1 Site-Wide Bedrock Locations 13.1.1.1 Shallow Locations 13.1.1.2 Intermediate-Depth Bedrock Locations 23.1.1.3 Deep Bedrock Locations 2

3.1.2 Former Waste Disposal Site 33.2 GROUND WATER QUALITY DATA 5

3.2.1 Site-Wide Bedrock Locations 53.2.1.1 Shallow Depth Bedrock Locations 63.2.1.2 Intermediate-Depth Bedrock Locations 63.2.1.3 Deep Bedrock Locations 73.2.1.4 Monitor Well LI and Residential Well BE236 9

3.2.2 Former Waste Disposal Site 9

4.0 PRINCIPAL FINDINGS 14.1 BEDROCK AQUIFER 14.2 UNCONSOLIDATED ZOfflE NEAR THE FORMER WASTE

DISPOSAL SITE 24.3 OIL INTERCEPTION TRENCH AT THE FORMER WASTE

DISPOSAL SITE 2

5.0 REFERENCES 1

TABLES

2-1. Summary of Water-Level Measurements, Groundwater Sampling Frequency andLaboratory Analytical Methods, Alcoa-Davenport Works, Riverdale, Iowa.

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2-2.

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TABLES (continued)

Precipitation Data Recorded during 1995 by the National Weather Service at theQuad Qties Airport, Moline, Illinois.

Estimated Pumping Rates and Groundwater Withdrawal from Production Wellsduring 1995, Alcoa-Davenport Works, Riverdale, Iowa.

Quarterly Water-Level Elevations (ft msl) from Bedrock Monitoring Wells during1995, Alcoa-Davenport Works, Riverdale, Iowa.

Quarterly Fluid-Level Elevations (ft msl) at the Former Waste Disposal Site during1995, Alcoa-Davenport Works, Riverdale, Iowa.

Quarterly Free-Phase Product Thickness Measurements in Feet at the FormerWaste Disposal Site during 1995, Alcoa-Davenport Works, Riverdale, Iowa.

Adjusted Quarterly Water-Level Elevations due to the Presence of Free-PhaseProduct at the Former Waste Disposal Site during 1995, Alcoa Davenport Works,Riverdale, Iowa.

Summary of Analytical Results for Groundwater from Site-Wide Shallow MonitorWells during 1995, Alcoa-Davenport Works, Riverdale, Iowa.

Summary of Analytical Results for Groundwater from Intermediate Depth BedrockMonitor Wells during 1995, Alcoa-Davenport Works, Riverdale, Iowa.

Summary of Analytical results for Groundwater from Deep Bedrock Monitor Wellsduring 1995, Alcoa-Davenport Works, Riverdale, Iowa.

Summary of VOC Analytical Results from Groundwater from Monitor Wells LI andResidential Well BE236 during 1995, Alcoa-Davenport Works, Riverdale, Iowa.

Summary of Analytical Results for Groundwater from Former Waste Disposal AreaMonitor Wells during 1995, Alcoa-Davenport Works, Riverdale, Iowa.

FIGURES

Location of Bedrock Monitor Wells and Plant Production Wells, Alcoa-DavenportWorks.

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FIGURES (continued)

2-2. Location of Shallow Monitor Wells, Oil Interception Trench and Collection Wells atthe Former Waste Disposal Site, Alcoa-Davenport Works.

I2-3. Monthly Precipitation for 1995, Quad Cities Airport, Moline, Illinois.

2-4. Estimated Groundwater Withdrawal from Production Wells During 1995, Alcoa-Davenport works, Riverdale, Iowa.

3-1. Hydrograph of Water-Level Elevations from Selected Shallow Monitor WellsDuring 1995, Alcoa-Davenport Works, Riverdale, Iowa.

3-2. Hydrograph of Water-Level Elevations from Selected Intermediate Depth Monitorf Wells during 1995, Alcoa-Davenport Works, Riverdale, Iowa.

3-3. Hydrograph of Water-Level Elevations in Selected Deep Monitor Wells during1995, Alcoa-Davenport Works, Riverdale, Iowa.

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I~ C. 1995 Quarterly Free-Phase Product Thickness Maps at the Former Waste Disposal• Site.

APPENDICES

A. 1995 Quarterly Water Level Elevations and Groundwater Contour Maps fromIntermediate Depth Bedrock Monitor Wells.

B. 1995 Quarterly Water-Level Elevations and Groundwater Contour Maps from DeepBedrock Monitor Wells.

D. 1995 Quarterly Adjusted Water-Level Maps and Groundwater Level Contour Mapsat the Former Waste Disposal Site.

E. 1995 Quarterly Site-Wide Water Quality Maps.

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Annual Groundwater Monitoring DataOriginal Issue Date: March 5, 1996

Section 1.0 - IntroductionRevision 0 - March 5, 1996

Page 1 of 2


ALCOA-DAVENPORT WORKSRIVERDALE, IOWA

1.0 INTRODUCTION

Geraghty & Miller, Inc. is pleased to provide this summary report of groundwater

monitoring data at the Alcoa-Davenport Works in Riverdale, Iowa. This report is a

compilation and evaluation of monitoring data collected during 1995 which was presented

in the 1995 quarterly reports (Geraghty & Miller, Inc. 1995a, b, c, d).

The data were collected in accordance with the Phase in Ground-Water Monitoring

Plan (Geraghty & Miller, Inc. 1989) with the following revisions: 13 bedrock and four

shallow unconsolidated zone wells have been added to the site-wide network for water-

quality sampling and fluid-level measurements; two wells (LI and BE 236) located west of

the Alcoa property boundary along South Bellingham Street were sampled; and free-phase

product thickness measurements were collected using an electronic oil/water interface

probe.

The objectives of the 1995 groundwater monitoring programs were expanded from

the Phase ID Ground-Water Monitoring Plan to include the following tasks:

• Monitor site-wide groundwater quality and flow conditions in shallow,

intermediate and deep intervals of the bedrock aquifer to ensure groundwater

capture.


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Section 1.0 - IntroductionRevision 0 - March 5, 1996

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Monitor groundwater quality and flow conditions in the unconsolidated zone

near the Former Waste Disposal Site.

Monitor the performance of the oil-interception trench in reducing off-site

migration of polychlorinated biphenyl (PCB) contaminated oil from the Former

Waste Disposal Site.

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Section 2.0 - Data Collection ProceduresRevision 0 - March 5, 1996

Page 7 o/5

2.0 DATA COLLECTION PROCEDURES

Data collection procedures for groundwater monitoring are described in this section.

The objectives of the groundwater monitoring program were met through collection of

fluid-level measurements and groundwater sampling at the Former Waste Disposal Site and

site-wide bedrock wells. Additional tasks, such as the collection of pumping data and

meteorological data, are also described. Table 2-1 summarizes the frequency of water-level

measurements and groundwater sampling, and presents the laboratory analytical methods

used during the groundwater monitoring program.

2.1 MEASUREMENT OF WATER-LEVELS AND FLUID-LEVELS

This section provides a discussion of procedures used for measurement of fluid-level

elevations from site-wide bedrock and Former Waste Disposal Site monitor wells.

2.1.1 Site-Wide Bedrock Locations

To monitor groundwater flow in the bedrock aquifer, water-level elevations were

measured on a quarterly basis during February, May, August and November from 26

bedrock wells in the shallow, intermediate and deep bedrock zones. Table 2-1 lists bedrock

monitoring wells used for water-level measurements. Locations of the bedrock wells are

shown on Figure 2-1. Water-level elevations were measured using an electronic water-level

indicator in accordance with Phase HI monitoring procedures.

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2.1.2 Former Waste Disposal Site

To monitor the effectiveness of the oil-interception system, fluid-level elevations and

free-phase product thicknesses in monitor wells and collection manholes at the Former

Waste Disposal Site were measured on a quarterly basis (Table 2-1). The effectiveness of

the oil-interception system in eliminating PCB-contaminated oil migration off site is

determined primarily by comparing the relationship between fluid levels in collection wells

and the upper and lower limits of the high-density polyethylene (HDPE) liner within the

Former Waste Disposal Site. Relative differences in free-phase product thicknesses

between wells upgradient and downgradient from the oil-interception trench are an

additional measure of the performance of the system. Locations of the fluid-level and free-

phase product thickness monitoring points at the Former Waste Disposal Site are shown on

Figure 2-2.

Fluid-level and product thickness measurements were taken in accordance with

Phase HI monitoring procedures, with the exception of modified field procedures for the

measurement of fluid levels and free-phase product thicknesses and the decontamination of

the associated equipment. To improve the precision of fluid-level measurements obtained

as part of the periodic monitoring, an electronic product/water interface probe was utilized

in all wells in which free-phase product had been encountered. The probe is designed to

detect free-phase product thicknesses as little as 0.01 foot. As an additional quality

assurance measure at locations where measurable thicknesses of free-phase product were

encountered, a disposable polyethylene bailer was used to confirm some of the

measurements made by the free-phase product/water interface probe.

To reduce the chance of cross-contamination between wells where free-phase

product was present, decontamination procedures consisted of successive treatments of the

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interface probe and exposed tape using methyl alcohol or hexane and an aqueous solution

of laboratory-grade soap and distilled water. In wells where no free-phase product was

detected, methyl alcohol was not used unless field personnel deemed additional

decontamination necessary.

2.2 WATER-QUALITY SAMPLING

Groundwater-quality sampling was performed in accordance with the Phase HI

Ground-Water Monitoring Plan. Groundwater samples were shipped to Quanterra

Environmental Services in North Canton, Ohio, for analysis. This section describes

laboratory analytical methods, purge water management and quality control procedures

used during groundwater sampling.


As indicated in Table 2-1, bedrock monitoring wells were sampled in May and

November. Locations of bedrock monitor wells are shown on Figure 2-1. Samples were

analyzed for volatile organic compounds (VOCs) by United States Environmental

Protection Agency (EPA) Method 624 and for PCBs by modified SW-846 Method 8080,

with the exceptions of intermediate Bedrock Well LI and Residential Well BE 236. These

two wells, located along South Bellingham Street, were analyzed for VOCs by USEPA

Method 8260.

Because VOCs were detected in some monitoring wells during past groundwater

sampling, procedures were established to treat purge water from several wells. During 1995

semi-annual sampling, purge water from Monitoring Wells DI, El, GI, HI and PW-06 was

treated by pumping it through activated carbon to remove VOCs and then into a holding


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Section 2.0- Data Collection ProceduresRevision 0 - March 5, J996

Page 4 of 5

tank. The treated water in this tank was analyzed by Beting Laboratories in Moline, Illinois,

prior to transfer to Alcoa's industrial waste treatment system. No VOCs were detected in

the treated purge water.

Stringent quality-control procedures were employed during collection of all

groundwater samples. Groundwater sampling of all monitor wells was completed using

disposable polyethylene bailers. Water-quality sampling equipment was decontaminated by

following the procedures in the Phase IE Ground-Water Monitoring Plan throughout the

sampling program.

Additional quality-control procedures used during groundwater sampling included

analysis of trip blanks, field blanks, equipment blanks and field duplicate samples. Trip

blanks were included in each shipment of VOC samples. One field blank and one

equipment blank were analyzed for every 20 groundwater samples collected, and one field

duplicate was analyzed for every 10 samples collected. All samples were preserved in the

field as necessary and kept on ice for shipment to the laboratory.


Water-quality sampling at the Former Waste Disposal Site included semi-annual

sampling of Former Waste Disposal Site monitor wells GM-4R, GM-6R, GM-10 and GM-

12R and Monitor Well AS for VOCs (Table 2-1). Locations of these wells are shown on

Figure 2-2. Water-quality sampling at these locations was conducted to track the

concentration of VOCs in shallow groundwater at the Former Waste Disposal Site. VOCs

in groundwater were analyzed using EPA Method 624.

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During previous semi-annual sampling events, free-phase product was noted in

monitoring wells GM-10 and GM-12R. Field sampling personnel attempted to sample only

the water in these wells for analysis of VOCs; however, small quantities of oil were included

in the samples. Purge water from GM-10 and GM-12R was collected in 55-gallon drums for

off-site disposal.

2.3 MONTHLY PRECIPITATION AND PUMPING DATA

In addition to quarterly and semi-annual monitoring described previously,

precipitation and groundwater withdrawal information were recorded. Monthly

precipitation data from the National Weather Service station located at the airport in

Moline, Illinois were compiled to help evaluate the relationship between water levels in

saturated alluvium and precipitation. Table 2-2 summarizes daily precipitation from

January through December 1995. Figure 2-3 provides a bar graph of total monthly

precipitation for 1995. Meter readings were also recorded from plant production wells for

the calculation of monthly pumping rates and volumes. This pumping information was

collected for the generation and evaluation of bedrock flow maps and for annual Iowa

Department of National Resources (EDNR) reporting purposes. Estimated groundwater

withdrawal and pumping rates during 1995 are summarized on Table 2-3. Figure 2-4

provides a bar graph of estimated pumping volumes of groundwater withdrawn from plant

production wells.


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Section 3.0 - Results and DiscussionRevision 0 - March 5, 7996

Page 1 of 10

3.0 RESULTS AND DISCUSSION

The following section discusses the 1995 monitoring results for water-level

measurements and groundwater quality results for site-wide bedrock locations, and water

and fluid levels, free-phase product thicknesses, and groundwater quality results for the

Former Waste Disposal Site.

3.1 WATER-LEVEL AND FLUID-LEVEL MEASUREMENTS

The following section discusses results for quarterly fluid-level measurements from

site-wide bedrock and Former Waste Disposal Site locations.


Quarterly water-level measurements from site-wide bedrock monitor wells were

converted to elevations above mean sea level (msl) and are summarized in Table 3-1. The

following sections discuss shallow, intermediate and deep bedrock monitor well water-level

elevations.

3.1.1.1 Shallow Locations

Figure 3-1 is a hydrograph of water-level elevations at selected site-wide shallow

monitoring locations. Precipitation measurements collected by the National Weather

Service in Moline, Illinois, for January through December 1995 are summarized on Figure

2-3 and Table 2-2. Monthly groundwater pumping volumes are presented on Figure 2-4 and

Table 2-3. Groundwater flow maps were not prepared for these monitoring points because


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of the small number of data points. Regional groundwater flow in the vicinity of Alcoa-

Davenport Works is generally to the south toward the Mississippi River; however, the

regional flow trend in the shallow bedrock may be influenced by pumping of on-site

production wells.

3.1.1.2 Intermediate-Depth Bedrock Locations

Water-level elevations from intermediate-depth monitor wells were used to

construct groundwater flow maps for February, May, August and November 1995

(Appendix A, Figure A-l through A-4). The flow maps indicate that a site-wide

groundwater cone of depression has been maintained through continued pumping of

Production Well PW-06. A hydrograph, which shows water-level elevations through time

for intermediate-depth monitor wells Fl, DI, LI, HI, GI and El, is presented as Figure 3-2.

In general, water-level elevations in intermediate-depth monitor wells reflect pumping of

active production wells. At times of greatest pumping (January through March), water

levels are generally lower. The correlation between water-level elevations in monitor wells

and the magnitude of pumping from Production Well PW-06 also depends on the distance

of the monitoring point from the active production well. The intermediate well furthest

from PW-06 is FI. FI is affected less by pumping and shows the smallest range of water-

level elevation fluctuations through time. Monitor Well MI, located near Production Well

PW-06, shows the greatest response to pumping.]

3.1.1.3 Deep Bedrock Locations

Groundwater flow maps for the deep bedrock in March, May, August and

November are provided in Appendix B. These maps confirm that a site-wide cone of

depression in the deep bedrock aquifer continues due to the pumping of Production Well


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PW-06. Figure 3-3 is a hydrograph for selected deep Monitor Wells AD, BD, CD, DD, ED

and FD. Figure 2-4 provides pumping volumes for Production Well PW-06. Water levels

are generally lowest at times of greatest pumping. The greatest response to production well

pumping is apparent in deep Monitor Well ED, near the pumping center, while only a small

effect is seen in the deep monitor wells CD and FD farthest from the pumping centers.


Fluid levels in shallow unconsolidated zone wells and collection manholes at the

Former Waste Disposal Site were measured quarterly. Locations of data collection

points at the Former Waste Disposal Site are illustrated on Figure 2-2. Depth-to-fluid

measurements from each location at the Former Waste Disposal Site were converted to

elevations above msl and are summarized in Table 3-2. Free-phase product thicknesses

were also recorded with depth-to-fluid measurements for each monitor well and

collection manhole where free-phase product was encountered. Product thickness

measurements are summarized in Table 3-3, and maps illustrating free-phase product

thickness at the Former Waste Disposal Area are provided in Appendix C.

To account for the local depression of the water-table surface beneath floating free-

phase product, a correction factor was applied to fluid-level elevations in wells at which

floating free-phase product was encountered. This correction factor, which accounts for

specific gravity and thickness of the floating free-phase product, permits the determination

of the potentiometric head in the absence of the free-phase product. Table 3-4 presents the

adjustments applied to measured water-level elevations. Corrected water-level elevations

were plotted on site maps to illustrate groundwater flow conditions at the Former Waste

Disposal Site. Figures illustrating corrected groundwater elevations and groundwater flow

conditions at the Former Waste Disposal Area are provided in Appendix D.


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In general, flow conditions at the Former Waste Disposal Site were consistent with

radial flow conditions documented during previous years. To evaluate the potential for

free-phase product to pass above or below the HDPE liner along the trench, and to evaluate

the effectiveness of the system, the elevations of the top and bottom of free-phase product

in the wells were compared to the elevations of the top and bottom of the HDPE liner. In

addition, product thicknesses in wells both inside and outside the liner were compared.

During quarterly monitoring events, fluid-level measurements were below the base of the

HDPE liner at collection manhole CM-08 during August and November. However, fluid

level measurements and the presence of free-phase product in CM-08 does not indicate

migration beneath the HDPE liner in this location. Fluid levels on both sides of the trench

were higher than those measured in CM-08 indicating flow directions toward the trench. All

other measurements obtained from CM-01 through CM-07 are within the upper and lower

boundaries of the HDPE liner.

Floating free-phase product was persistent in shallow Monitor Wells GM-01R, GM-

10, GM-11R, GM-17R, GM-18, GM-19, GM-21, GM-22, GM-23, GM-26, GM-28 and

GM-29. Monitor Wells GM-17R, GM-18, GM-19, GM-22 and GM-23, located inside the

interception trench, typically contained the greatest free-phase product thickness (Appendix

C). The greatest thickness of product was recorded in Monitor Well GM-17R during

February. Free-phase product was detected in the collection manholes CM-01 and CM-06

in November and in CM-08 in August. No measurements could be made during February

at the collection manholes due to frozen manhole lids. Free-phase product was not

detected in any other collection manholes.

Floating free-phase product was observed in shallow Monitor Wells GM-01R, GM-

10, GM-11R, GM-26, GM-28 and GM-29 exterior to the oil interception trench. As shown

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on Figure 2-2, Monitor Well GM-01R is located immediately northeast, and the remaining

five monitor wells are located southwest of the Former Waste Disposal Site. The six

monitor wells had measurable thicknesses of floating free-phase product ranging from 0.06

foot (GM-01R, May 1995) to 1.35 feet (GM-11R, November 1995). However, Monitor Well

GM-23, located upgradient and inside the oil interception trench, contained considerably

more free-phase product, a maximum of 4.40 feet in August (Table 3-3). Based on the

above discussion of fluid-level elevations in the oil interception trench compared to the

elevation of the HOPE liner, the migration of fluids beneath the base of the HDPE liner

does not appear to be the mechanism for the presence of free-phase product in Monitor

Wells GM-10 and GM-11R. Based on the thickness of free-phase product in monitor wells

inside and outside the oil interception trench, the trench appears to be retarding migration

of PCB-contaminated oil from the Former Waste Disposal Site.

3.2 GROUNDWATER QUALITY DATA

Site-wide bedrock and Former Waste Disposal Site monitor wells were sampled

semi-annually for VOCs and/or PCBs. Monitor Well LI and Residential Well BE236,

located along South Bellingham Street, were sampled quarterly for VOCs. Table 2-1

summarizes the sampling schedule and parameters analyzed for each well. The following

sections discuss analytical results.


This section provides a discussion of analytical results for semi-annual groundwater

sampling from site-wide shallow, intermediate, and deep bedrock monitor wells.

Intermediate-depth Monitor Well LI and Residential Well BE236 quarterly groundwater

sampling results are also discussed.


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3.2.1.1 Shallow Depth Bedrock Locations

Four site-wide shallow Monitor Wells AS, DS, ES and FS were sampled semi-

annually. Wells DS, ES and FS were sampled for VOCs and PCBs. Well AS was sampled

for VOCs only, and has been included with the Former Waste Disposal Site monitor wells,

based on its location. No VOCs or PCBs were detected in any shallow wells. However, in

November acrylonitrile was detected in sample XS, a field duplicate of DS, at an estimated

concentration of 2.1J ug/L. Analytical results for groundwater samples collected from

shallow monitor wells are summarized in Table 3-5.

3.2.1.2 Intermediate-Depth Bedrock Locations

Groundwater samples were collected and analyzed for VOCs and PCBs from 11

intermediate-depth monitor wells, excluding Monitor Well LI, on a semi-annual basis.

Monitor Well LI results are discussed in Section 3.2.1.4. No VOCs were detected in wells

AI, CI or KI. No PCBs were detected in any intermediate monitor wells. Table 3-6

summarizes the analytical results for groundwater samples collected from intermediate-

depth monitor wells. Detected VOCs in intermediate-depth monitor wells are discussed

below.

The most common VOCs detected in intermediate monitor wells include: 1,1-

dichloroethane; 1,2-dichloroethane; 1,2-dichloroethene (total); benzene; tetrachloroethene

(PCE); toluene; trichloroethene (TCE); and vinyl chloride. 1,1-Dichloroethane was

detected in Monitor Wells BI, DI, FI and MI ranging in concentration from an estimated

2.4J ug/L in FI during May to 41 (ig/L in DI during May. 1,2-Dichloroethane was detected

in MI at concentrations of 5.1 ug/L and an estimated 4.9J ug/L in May and November,


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respectively. 1,2-Dichloroethene (total) was detected in Monitor Wells BI, DI, GI, HI, JI

and MI at concentrations ranging from an estimated 2.5J ug/L in JI during November to

2,000 ug/L in GI during May. Benzene was detected in Monitor Wells El, JI and MI at

concentrations ranging from 9.1 ug/L in JI during November to 810 ug/L in El during

November. PCE was detected in Wells DI, GI, HI and MI ranging in concentration from an

estimated 2.3J ug/L in JI during May to 7,100 ug/L in GI during November. Toluene was

detected in Well El during May and November at concentrations of an estimated 15J ug/L

and 19 ug/L, respectively. TCE was detected in Wells DI, GI and HI at concentrations

ranging from an estimated 3.2J ug/L in Well DI during November to 1,800 ug/L in Well HI

during November. Vinyl chloride was detected in Wells BI, DI and MI at concentrations

ranging from an estimated 9.9J ug/L in MI during November to 460 ug/L in DI during

May.

As in previous sampling events, the aromatic hydrocarbon benzene was detected

during each of the 1995 sampling events in Monitor Wells El and JI located along the

western Alcoa property boundary. Benzene was also detected during each sampling event

in Wei] MI, located near Production Well PW-06 and the western Alcoa Property boundary.

Toluene, another aromatic hydrocarbon, was also detected in Well El. Groundwater flow

data indicate that the source of benzene and toluene is likely west of the E well cluster and

outside of the western Alcoa property boundary.

3.2.1.3 Deep Bedrock Locations

Groundwater samples were analyzed for VOCs and PCBs from 11 deep bedrock

wells and active Production Well PW-06 semi-annually. No PCBs were detected in any

deep monitor wells or in Production Well PW-06. No VOCs were detected in Monitor


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Aromatic hydrocarbons benzene and ethylbenzene were detected during each

I sampling event in bedrock Monitor Well JX, located along the southwestern Alcoa property

boundary. As stated in Section 3.2.1.2 it is believed that the source of aromatic

• hydrocarbons is outside Alcoa's western property boundary.

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Wells AD, AX, CD, ED, FD and KD. Table 3-7 summarizes the analytical results for

groundwater samples collected from deep monitor wells and Production Well PW-06.

Detected VOCs in deep monitor wells and Production Well PW-06 are discussed below.

The most commonly detected VOCs in deep wells include: 1,1-dichloroethane; 1,2

dichloroethene; and vinyl chloride. 1,1-Dichloroethane was detected in Monitor Well DD

and Production Well PW-06 ranging in concentrations from 7 ug/L in DD during May to an

estimated 46J ug/L in PW-06 during May. 1,2-Dichloroethene (total) was detected in

Monitor Wells BD, DD, GD, HX and Production Well PW-06 ranging in concentrations

from 2.6J ug/L in HX during November to 1,800 ug/L in PW-06 during November.

Benzene was detected in JX during May and November at concentrations of 30 ug/L and

22 ug/L, respectively. Ethylbenzene was also detected in Monitor Well JX during May and

November at concentrations of 30 ug/L and 28 ug/L, respectively. PCE was detected in

Monitor Wells DD, HX and PW-06 at concentrations ranging from an estimated 2.3J ug/L

in HX during May and 2,500 ug/L in PW-06 during November. However, no PCE was

detected in Monitor Well HX during November. TCE was only detected in Production

Well PW-06 during May and November at concentrations of 590 ug/L and 560 ug/L,

respectively. Vinyl chloride was detected in DD and PW-06 in concentrations ranging from

84 ug/L in DD during May to 260 ug/L in PW-06 during November.

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3.2.1.4 Monitor Well LI and Residential Well BE236

Monitor Well LI and Residential Well BE236, located along South Bellingham

Street, were scheduled for sampling on a quarterly basis. However, samples could not be

collected from BE236 during August and November 1995 because the residence was vacant

and power to the well pump was disconnected. Analytical results for samples collected from

LI and BE236 are summarized on Table 3-8. The following provides a discussion of

analytical results.

1,2-Dichloroethene (total), TCE and vinyl chloride were detected in intermediate-

depth Monitor Well LI. 1,2-Dichloroethene (total) was detected at concentrations ranging

from 4.2 ug/L during February to 8.9 ug/L during November. TCE was detected in LI

during February, May and November at concentrations of 4.2 ug/L, 3.6 (ig/L and 3 ug/L,

respectively. No TCE was detected in LI during August. Vinyl chloride was detected in

Monitor Well LI only during August at a concentration of 3.5 ug/L. No other VOCs were

detected in Monitor Well LI. No PCBs were detected in Monitor Well LI during May. No

VOCs were detected in Residential Well BE236 during February and May.


Five wells GM^R, GM-6R, GM-10, GM-12R and AS, located outside the oil-

interception trench at the Former Waste Disposal Site, were sampled semi-annually for

VOCs. Analytical results for samples collected from these wells are summarized on Table

3-9. The following provides a discussion of detected VOCs in these wells.

VOCs most commonly detected in wells at the Former Waste Disposal Site include;

1,1-dichloroethane; 1,2-dichloroethene (total); benzene; PCE; TCE; and vinyl chloride. 1,1-

GERAGHTY & MILLER, INC. IJ

IIIIIIIIIIIIIIIIIII



Page 10 of 10

Dichloroethane was detected in Monitor Wells GM-10 during November and AS during

May at estimated concentrations of 4.4J ug/L and 5.2J ug/L, respectively. 1,2-

Dichloroethene (total) was detected in Monitor Wells GM-6R, GM-10, GM-2R and AS at

concentrations ranging from an estimated 4.9J ug/L in GM-10 during November to 300

ug/L in AS during May. Benzene was detected in Monitor Well GM-4R during May and

November at estimated concentrations of 2.13 ug/L and 3.7J ug/L, respectively. PCE was

detected in Monitor Well GM-10 at an estimated concentration of 2.4J ug/L during May

1995. TCE was also detected in Monitor Well GM-10 during May and November at

estimated concentrations of 3.9J |ag/L and 4.9J ug/L, respectively. Vinyl chloride was

detected in Monitor Wells GM-6R, GM-10, GM-12R and AS at concentrations ranging

from an estimated 2.7J ug/L in GM-6R during May to 690 ug/L in GM-12R during

November.


IIIIIIIIIIIIIIIIIII


Section 4.0 - Principal FindingsRevision 0 - March 5, 1996

Page 1 of 2

4.0 PRINCIPAL FINDINGS

The results of groundwater monitoring at the Alcoa-Davenport Works during 1995

are summarized in the following principal findings.

4.1 BEDROCK AQUIFER

• The established trend of bedrock groundwater flow toward Production Well PW-

06 has been maintained during 1995. Alcoa's year-round pumping of Production

Well PW-06 has continued to maintain a site-wide cone of depression.

• Groundwater elevations in the site-wide shallow unconsolidated and shallow

bedrock wells appear to correlate with variations in precipitation, and also

suggests some influence due to pumping of the bedrock aquifer.

• Aromatic hydrocarbons, benzene, ethylbenzene and toluene were detected in

intermediate and deep bedrock monitor wells near the southwestern property

boundary. Flow data suggest that the source of aromatic hydrocarbons is outside

the Alcoa property boundary.

• Comparisons of total VOC concentrations in intermediate monitor wells from

1993 to 1994 showed similar total VOC concentrations during 1995, with the

exception of Monitor Well HI which showed an increased total VOC

concentration of 7,000 g/L during November 1995.

GERAGHTY& MILLER, INC. W

III

IIIIIIIIIIIIII


Section 4.0 - Principal FindingsRevision 0 - March 5, 1996

Page 2 of 2

• Deep bedrock monitor wells containing VOC concentrations in prior years (1993

and 1994) showed a slight decrease in total VOC concentrations during 1995

with the exception of Monitor Well GD, which showed a slight increase in total

VOC concentration.

• VOC results at Monitor Well LI indicate low levels of 1,2-dichloroethene (total),

TCE and vinyl chloride consistent with past years. No constituents were

reported in Residential Well BE 236.

4.2 UNCONSOLIDATED ZONE NEAR THE FORMER WASTE DISPOSAL SITE

• Shallow groundwater flow at the Former Waste Disposal Site continues to be

radially away from the center of the site.

• Floating free-phase product continues to be present at the Former Waste

Disposal Site in a distribution similar to that of previous years.

4.3 OIL INTERCEPTION TRENCH AT THE FORMER WASTE DISPOSAL SITE

• The oil interception trench appears to be effective in retarding the migration of

free-phase product from the Former Waste Disposal Site, and conditions will

continue to be monitored in the future.


IAnnual Groundwater Monitoring Data

• Original Issue Date: March 5, 1996Section 5.0 - References

Revision 0 - March 5, 7996I Page 1 of 1

• 5.0 REFERENCES

I Geraghty & Miller, Inc. 1989. Phase HI Ground-Water Monitoring Plan for the Alcoa-Davenport Waste-Disposal Site.

• Geraghty & Miller, Inc. 1994. Summary of Groundwater Monitoring Data Collected• During 1993 and 1994 for the Alcoa-Davenport Works, Riverdale, Iowa.

• Geraghty & Miller, Inc. 1995a. First Quarter 1995 Monitoring Data Report for the Alcoa-Davenport Works, Riverdale, Iowa.

| Geraghty & Miller, Inc. 1995b. Second Quarter 1995 Monitoring Data Report for theAlcoa-Davenport Works, Riverdale, Iowa.

| Geraghty & Miller, Inc. 1995c. Third Quarter Monitoring Data Report for 1995 for theAlcoa-Davenport Works, Riverdale, Iowa.

• Geraghty & Miller, Inc. 1995d. Fourth Quarter Monitoring Data Report for 1995 forAlcoa-Davenport Works, Riverdale, Iowa.

I

I

I

I

I

I

I

I

1 :\ALCOA\ANULWra I W5\ANLRPT.DOC


IIIIIIIIIIIIIIIIIII

Page 1 of 3

Table 2-1. Summary of Water-Level Measurements, Groundwater Sampling Frequency and LaboratoryAnalytical Methods, Alcoa-Davenport Works, Riverdale, Iowa.

Monitor WellQuarterly

Water-LevelMeasurements

QuarterlyGroundwater

Sampling

Semi-AnnualGroundwater

Sampling

SHALLOW MONITOR WELLS AT THE FORMER WASTE DISPOSAL SITE

GM-01R

GM-02

GM-04R

GM-05

GM-06R

GM-08D

GM-09

GM-10

GM-11R

GM-12R

GM-13

GM-14

GM-16

GM-17R

GM-18

GM-19

GM-20

GM-21

GM-22

GM-23

GM-24

GM-25

GM-26

GM-27

GM-28

X

X

X

X

X

X

X

X

X

X

X

X

X

X

X

X

X

X

X

X

X

X

X

X

X

VOCs (624)

VOCs (624)

VOCs (624)

VOCs (624)


IIIIIIIIIIIIIIIIII1

Page 2 of 3

Table 2-1. Summary of Water-Level Measurements, Groundwater Sampling Frequency and LaboratoryAnalytical Methods, Alcoa-Davenport Works.

Monitor Well

GM-29

QuarterlyWater-Level

Measurements

X


Sampling

Semi-AnnualGroundwater

Sampling

COLLECTION MANHOLES

CM-01

CM-02

CM-03

CM-04

CM-05

CM-06

CM-07

CM-OS

X

X

X

X

X

X

X

X

BEDROCK AQUIFER WELLS (SITE- WIDE)

Al

AD

AX

BI

BD

CI

CD

DI

DD

El

ED

FI

FD

GI

GD

X

X

X

X

X

X

X

X

X

X

X

X

X

X

X

VOCs (624), PCBs

VOCs (624), PCBs

VOCs (624), PCBs

VOCs (624), PCBs

VOCs (624), PCBs

VOCs (624), PCBs

VOCs (624), PCBs

VOCs (624), PCBs

VOCs (624), PCBs

VOCs (624), PCBs

VOCs (624), PCBs

VOCs (624), PCBs

VOCs (624), PCBs

VOCs (624), PCBs

VOCs (624), PCBs


Ii1iIIIIIiilIIfI

Page 3 of 3

Table 2-1. Summary of Water-Level Measurements, Groundwater Sampling Frequency and LaboratoryAnalytical Methods, Alcoa-Davenport Works.

Monitor Well

HI

HX

Jl

JX

KI

KD

MI

PW-1

PW-2

PW-3

PW-4

PW-5

PW-6

QuarterlyWater-Level

Measurements

X

X

X

X

X

X

X

X

X

X

X

X

X


Sampling

Semi-AnnualGroundwaler

Sampling

VOCs (624), PCBs

VOCs (624), PCBs

VOCs (624), PCBs

VOCs (624), PCBs

VOCs (624), PCBs

VOCs (624), PCBs

VOCs (624), PCBs

VOCs (624), PCBs*

VOCs (624), PCBs*

VOCs (624), PCBs*

VOCs (624), PCBs*

VOCs (624), PCBs*

VOCs (624), PCBs*

SHALLOW MONITOR WELLS (SITE- WIDE)

AS

DS

ES

FS

X

X

X

X

VOCs (624)

VOCs (624), PCBs

VOCs (624), PCBs

VOCs (624), PCBs

OFF-SITE WELLS

LI

BE236

X VOCs (8260)

VOCs (8260)

VOCs (8260)

VOCs (8260)

PCB analysis Modified SW-846 Method 8080.( ) U.S. EPA analysis method number.* Sampled if active.

l:\ALCDAtANUJPTfMM\TA£LBttTAa4l .DOC

ii


Table 2-2. Precipitation Data Recorded during 1995 by the National Weather Service at the Quad Cities Airport, Moline, Illinois.

DATE

123456789101 1121314

1516171819

2021222324

252627

28293031

Monthly Total

Monthly Normal

Departure from

Normal

Jan-95

T000

0.01

0 2 10.01

0TTT

0.02

0.40.62

00

0.03

01.51

TT

0.03

0.01

000

0.31

O.I00T

3261.54

1.72

Feb-95

00

0.01

T0T

003000T00T

0.02

0000T00000

0.48

TT

054

1,23

-069

Mar-95

000

0020.26

0.06

003T0000T0000T

003

0.31

00.05

000

0.38

0.22

0.05

TT0

1 41

298-1 57

Apr-95

T0

O.I0TT

0050 16

1.23

1 65

0.37

0.02

000T

0.02

0650

0.02

000

0030.28

1 33

0020

025001

6 19

3902.29

May-95

00

0.02

O. I00

0.55

1 130.21

T0

0.15

05800

002T

0.27

000

0092.92

0.04

0T

0930.04

00T

7.05

430

2.75

Jun-95

T0.62

00000T

0080T00000T000

00200T

1.16

0610 2 1

0.13

0.03

0

2 86

4.27

-1.41

Jul-95

00T

1 68

0.29

0000000000

0 16

00

003T0

0.17T0T

0.07

0.21

000

0.45

307

4.95

-1 88

Aug-95

0.01

0.15

0220.05

000

0 4 10.67

0000T

0.95

T002

0000000000T00T

2.48

4 2 2-1.74

Sep-95

T0000

005001

0000

005000000

038T

02600T000

00.09

1 08

1.92

402

-2.10

Ocl-95 Nov-95* Dec-95*

TT

0.01

00240.1TT0000TT0000

0.13

0.06

T0

0 12

T0

0240.16

0.09

T0.38

0.3183 3.16 0.50

2.93 251 2.23

-1 10 0.65 -1 73

Notes:

T = Trace

All measurements are reported in inches.

* Daily rainfall data not available for November and December I \ateo«\anulrp1s'1995\lable3\lbl2_2.x1s —~


II1!iiiiiiiiiiiiiii

Table 2-3. Estimated Pumping Rates and Groundwater Withdrawal from Production Wellsduring 1995, Alcoa-Davenport Works, Riverdale, Iowa.

Month

JanuaryFebruaryMarchAprilMayJuneJulyAugustSeptemberOctoberNovemberDecember

1O1AL 1995

Rate (gpm)

230230230200200200185185185240240240

Volume (gal)

10,267,2009,273,60010,267,2008,640,0008,640,0008,640,0008.258,4008,258,4007,992,00010,713.60010.368,00010,713,600112,032,001)

NOTES:gpm = Gallons per minute.gal = Gallons.Production Well PW-6 was the only active production well during 1995.


II1IIIIIIIItIIIIIII

Table 3-1. Quarterly Water-Level Elevations (ft msl) from Bedrock Monitoring WellsDuring 1995, Alcoa-Davenport Works, Riverdale, Iowa.

WELL

ASDSESFS

Feb 7-8/95

563.44553.94565.19567.56

May 10-11/95

SHALLOW MONITOR565.19555.75566.00569.02

Aug 7-8/95

WELLS562.15554.65564.98567.49

Nov 7/95

562.83555.82565.15567.43

INTERMEDIATE DEPTH BEDROCK WELLSAIBICIDIElFIGIHIJIKILIMI

530.40538.32570.85530.47551.19567.65554.35556.85549.75559.98559.14505.57

534.22542.33573.50534.69556.58569.09560.17562.75553.98563.81566.15513.83

534.39542.71569.65535.16551.42567.57555.74557.66550.08560.95558.3

511.27

535.35542.55569.44535.75552.33567.48555.72557.65550.99561.20556.75514.03

DEEP BEDROCK. MONITOR WELLSADBDCDDDEDFDGDKD

AXHXJX

531.84538.69567.68530.77545.65568.31552.55550.80

532.71556.61548.76

535.76542.74570.41535.28552.20570.47558.29554.21

VERY DEEP BEDROCK536.31562.54552.68

535.49543.08567.83535.29546.69568.06554.27553.08

WELLS536.23557.41549.17

536.52542.91567.37535.92548.01567.96554.22553.35

537.45557.42550.16

NOTES:FT MSL = Feet above mean sea level.

i valcoa\annuais\199S\labie5\lbls4_7.xls


IIIIIIIIIIIiIIIIIII

Table 3-2. Quarterly Fluid-Level Elevations* (ft msl) at the Former Waste DisposalSite During 1995, Alcoa Davenport Works, Riverdale, Iowa.

WELLASGM-01RGM-02GM-04RGM-05GM-06RGM-08DGM-09GM-10GM-11RGM-12RGM-13GM-14GM-16GM-17RGM-18GM-19GM-20GM-21GM-22GM-23GM-24GM-25GM-26GM-27GM-28GM-29CM-01CM-02CM-03CM-04CM-05CM-06CM-07CM-08

Feb 7-8/95563.44562.37564.31561.75561.68562.09562.20562.30560.01560.64564.17562.03566.19565.16561.69565.35574.20564.96562.52559.28558.65NM**

562.95560.53565.66557.49562.99NM**NM**NM**NM**NM**NM**NM**NM**

Mav 10-11/95565.19564.95566.21563.78562.87564.65564.49563.28563.41562.30564.79560.75567.11564.90563.39568.05575.61564.49563.82560.06561.56567.68564.03562.65565.69565.32567.15566.55566.92567.03566.23563.30562.53562.82563.20

Aug 7-8/95562.15562.15562.7560.86560.82560.67560.66561.12561.69561.63563.43560.83564.93564.16562.59

566572.61563.95561.23559.28562.96DRY

563.17562.25564.83557.48563.95563.84563.21564.42563.65561.9

561.09561.37561.77

Nov 7/95562.83562.46563.05562.86561.02562.58563.01562.81563.10563.43563.97561.87565.45565.00573.59569.74572.81564.50561.98562.96563.54568.39563.35563.17564.68557.60563.62564.05564.00563.91564.06562.10561.74562.02562.22

NOTES:NM = Not Measured

* Elevations not adjusted for free-phase product thickness.

** Access to measuring point of collection manholes not possible due to frozen lids during Feb. 1995.

See Table 3-4 for adjustments to the water-level elevations.

L \nlcoa\annual5\l<J')5Uablcs\tbls4_l \li


II1IIIIIIIIIIIIIIIi

Table 3-3. Quarterly Free-Phase Product Thickness Measurements in Feet at theFormer Waste Disposal Site During 1995, Alcoa Davenport Works.Riverdale, Iowa.

WELLASGM-01RGM-02GM-04RGM-05GM-06RGM-08DGM-09GM-10GM-11RGM-12RGM-13GM-14GM-16GM-17RGM-18GM-19GM-20GM-21GM-22GM-23GM-24GM-25GM-26GM-27GM-28GM-29CM-01CM-02CM-03CM-04CM-05CM-06CM-07CM-08

Feb 7-8/95ND

0.54NDNDNDNDNDND1.050.66NDNDNDND

11.912.731.50ND

0.322.503.93NM*ND0.67ND

0.190.32NM*NM*NM*NM*NM*NM*NM*NM*

May 10-11/95ND

0.06NDNDNDNDNDND1.001.06NDNDNDND

11.407.301.75ND1.062.583.89NDND0.59NDND0.25NDNDNDNDNDNDNDND

Aug 7-8/95ND0.27NDNDNDNDNDND0.901.25NDNDNDND

10.392.971.80ND0.953.024.40NDND0.50ND0.140.25NDNDNDNDNDNDND0.02

Nov 7/95ND0.21NDNDNDNDNDND0.991.35NDNDNDND9.613.670.3ND0.542.933.6NDND0.42NDND0.220.03NDNDNDND0.01NDND

NOTES:NM = Not Measured.

ND = No free-phase product detected.

* Access to measuring point of collection manholes not possible due to frozen lids during Feb. 1995.

i. alcoa\annuaJj\l995\lablcs\lbli4 7 xli


Table 3-4. Adjusted Quarterly Water-Level Elevations Due to the Presence of Free-Phase Product at the

Former Waste Disposal Site During 1995, Alcoa Davenport Works, Riverdale, Iowa.

Well Measured Depth toWater (Feet)

Product Thickness Adjusted Depth to(Feet) Water (Feet)

Adjusted Water-LevelElevation (Feet)

FEBRUARY 7-8, 1995GM-01RGM-10GM-11RGM-17RGM-18CM- 19GM-21GM-22GM-23GM-26GM-28GM-29

13.98184817.8427.7020.709.3116.1119.6820.9117.2221.1318.11

0.541.050.6611.912.731.500.322.503.930.670.190.32

13.5117.5717.27173418.328.0115.8317.5117.4916.64209617.83

562 84560.92561.21572.05 •567.73575.5156280561.46562.07561.11557 66563.27

MAY 10-11. 1995GM-01RGM-10GM-11RGM-17RGM-18GM-19GM-21GM-22GM-23GM-26GM-29

11 4015.0816.1826.0018.007.9014.81189018.0015.1013.95

0.061.001.06

1 1 .407.301.751.062.583.890.590.25

11.3514 2115.2616.0811.656.3813.8916.66146214.5913.73

565.00564 28563.22573.31574.40577 13564.74562.30564.94563.16567.37

AUGUST 7-8, 1995CM-08GM-01RGM-10GM-11RGM-17RGM-18GM-19GM-21GM-22GM-23GM-26GM-28GM-29

12.4514.216.8

16.85268

20.0510917.4

19.6821

15.521.1417.15

0.020.270.91 25

10.392.971.8

0953.024.40.5

0.140.25

12.4313.9716.0215.7617.7617.479.3316.5717.0517.1715.0721.0216.93

561.79562.38562.47562.72571.63568.58574.18562.06561.91562.39562.68557.6

564.17NOVEMBER?, 1995

CM-01CM-06GM-01RGM-10GM-11RGM-17RGM-18GM-19GM-21GM-22GM-23GM-26GM-29

11.8313.5114.1

16.3816.4

25.4119.98

1117.1918.9319.62

1517.7

0030.010.210.991.359.613.670.3

0.542.933.6

0.420.22

11.813.5

13.9215.5215.2317.0516.7910.7416721638164914.6317.51

564.05561 74562.43562.97563.25572.34569.26572.77561 9156258563.07563.12563.59


Table 3-5. Summary of Analytical Results for Groundwater from Site-Wide Shallow Monitor Wells during 1995,Alcoa-Davenport Works, Riverdale, Iowa.

COMPOUND1,1,1 -Trichloroethane1 , 1 ,2,2-Tetrachloroethane1,1,2-Trichloroethane1,1-Dichloroethane1,1-Dichloroethene1,2-DichloroethaneI.2-Dichloroethene (Total)1 ,2-Dichloropropane2-Chloroethyl vinyl etherAcroleinAcrylonitrileBenzeneBromodichloromethaneBromoformBromomethaneCarbon tetrachlorideChlorobenzeneChloroethaneChloroformChloromethaneDibromochloromethaneEthylbenzeneMethylene chlorideTetrachloroetheneTolueneTrichloroetheneVinyl chloridecis- 1 ,3-Dichloropropenetrans- 1 ,3-Dichloropropene

TOTAL VOCS

WELLDATE

UNITSug/Lug/Lug/Lug/Lug/Lug/Lug/Lug/Lug/Lug/Lug/Lug/Lug/Lug/Lug/Lug/Lug/Lug/Lug/Lug/Lug/Lug/Lug/Lug/Lug/Lug/Lug/Lug/Lug/L

ug/L

DS5/95 1 1/95

-------------------------------

0

------"~-~-------~~~---------~0

ES5/95 11/95

--------~~~--~~---~---~---------

0

---"-----------—"-~"--—--------0

FS5/95 11/95

-------~~------——-------~------

0

-----------~--------~-------------0

PCBs:Aroclor-1016Aroclor-1221Aroclor-1232Aroclor-1242Aroclor-1248Aroclor-1254Aroclor-1260

TOTAL PCBs

ug/Lug/Lug/Lug/Lug/Lug/Lug/L

ug/L

-------

0

~-"-----0

-----~~-

0

~-"----0

----------

0

-~-----0

*xs5/95 1 1/95

~-------------——~------~-----

0

~-~

---

0

"--~----"--

2.1J-----~~------~--~

2.1J

-~-----

0Indicates compound was not detected.

J = Estimated Value (including results reported below the detection*XS = Duplicate sample from monitor well DS.

limit)

t:\alcu\aiuuulsmWLiblcsM3 5 V xli


IIIIIIIIIIIIIIIIIII

Table 3-6. Summary of Analytical Results for Groundwater from Intermediate Depth Bedrock Monitor

Wells During 1995, Alcoa-Davenport Works, Riverdale, Iowa.

Page 1 of 2

COMPOUND

VOCs1,1,1-Trichloroethane1 , 1 ,2,2-Tetrachloroethane1,1,2-Trichloroethane1,1-Dichloroethane1,1-Dichloroethene1.2-Dichloroethane1 ,2-Dichloroethene (Total)1.2-Dichloropropane2-Chloroethvl vinyl etherAcroleinAcrylonitrileBenzeneBromodichloromethaneBromoformBromomethaneCarbon tetrachlorideChlorobenzeneChloroethaneChloroformChloromethaneDibromochloromethaneEthylbenzeneMethylene chlorideTetrachloroetheneTolueneTrichloroetheneVinyl chloridecis-1.3-Dichloropropenetrans- 1 .3-Dichloropropene

TOTAL VOCS

WELLDATE

UNITS

ug/Lug/Lug/Lug/Lug/Lug/Lug/L

ug/Lug/Lug/Lug/L

ug/Lug/Lug/Lug/Lug/Lug/Lug/Lug/Lug/Lug/Lug/Lug/Lug/Lug/Lug/Lug/Lug/Lug/L

ug/L

AI5/95 11/95

--

;;--

-0

--

--

--

0

BI5/95 11/95

6.6

14

25

45.6

8.5

26

56

90.5

CI5/95 1 1/95

--

--

--

0

-

--

-

0

DI5/95 1/95

41

670

460

1,171

15

95

43

3.2J

110

266.2J

El5/95 11/95

--

--

690

15J

705J

--

--

810

19

829

Fl5/95 1/95

2.4J

-

--

-

2.4J

--

29J

--

--

--

--

2.9J

PCBsAroclor-1016Aroclor-1221Aroclor-1232Aroclor-1242Aroclor-1248Aroclor-1254Aroclor-1260

TOTAL PCBs

ug/L

ug/Lug/Lug/Lug/Lug/Lug/L

ug/L

--0

--0

--

0—0

—0

-0

--

0

--

0

-

0

--

0

-

-

0

~

--

0Notes:- = Indicates compound was not detected.J = Estimated Value (including results reported below the detection limit)*XI = Duplicate sample from Monitor Well Fl during May 1995, and Monitor Well CI during November 1995.

i:\alcoa\aniui3ls\l'''J5\ublcsii


IIIIIIIIIIIIIIIIIII

Table 3-6. Summary of Analytical Results for Groundwater from Intermediate Depth Bedrock Monitor

Wells During 1995, Alcoa-Davenport Works, Riverdale, Iowa.

Page 2 of 2

COMPOUND

VOCs1,1 ,1 -Trichloroethane1 , 1 ,2.2-Tetrachloroethane

1 , 1 ,2-Trichloroethane

1,1-DichloroethaneI. l-Dichloroethene

1,2-Dichloroethane1.2-Dichloroethene (Total)

1,2-Dichloropropane2-Chloroethyl v inyl ether

Acrolein

Acrylonitrile

Benzene

Bromodichloromethane

Bromoform

Bromomelhane

Carbon tetrachlorideChlorobenzeneChloroethane

Chloroform

Chloromethane

Dibromochloromethane

Ethylbenzene

Methylene chloride

Tetrachloroethene

Toluene

Trichloroethene

Vinvl chloride

cis-l,3-Dichloropropenetrans- 1 .3-Dichloropropene

TOTAL VOCSPCBsAroclor-1016

Aroclor-1221Aroclor-1232

Aroclor-1242

Aroclor-1248Aroclor-1254Aroclor-1260

TOTAL PCBs

WELLDATE

UNITS

ug/Lug/Lug/Lug/Lug/Lug/Lug/Lug/Lug/Lug/Lug/Lug/Lug/Lug/Lug/Lug/Lug/Lug/Lug/Lug/Lug/Lug/Lug/Lug/Lug/Lug/Lup/1U& L~i

ug/Lug/L

ug/L

ug/L

ug/L

ug/L

ug/L

ug/L

ug/Lug/L

ug/L

(5/95

---------

2,000

--

--

---

--

--

-

--

--

-

--

-

-

--

--

--

5,100

--

1,200

----

8,300

------------

0

3111/95

--------

1,300

-

-

--

-

--

-

--

-

-

--

-

-

--

--

--

7.100

--

1.800

----

10,200

---------0

F5/95

-------42 '

--

--

--

--

--

--

--

--

--

--

-

--

--

--

-

-x240-20

----

302

-------- ~'---

0

il11/95

-------;

1,200

-

-

-

-

-

-

-

--

--

--

-

--

--

--

--

V-5,200

-600

----

10.200

---------0

J5/95

--------

3.9J

-

-

--

-13----------------

---

16.9J

----------0

I11/95

---------

2.5J

----

10J-

9.1-------------------

--

21.6J

------------0

K5/95

------------------------------------------

---0

----------0

:i11/95

-----------------------------------------

---0

-------0

N5/95

-----

3.7J

--5.1

51

--

--

--

--28----------------

2.3J

--in1 v

---

100.1J

~--------0

1111/95

----

2.8J

--4.9J

48

--

--

-

-47

-

-

-

--

--

-

--

--

--

--

-

-

--0 Ql7 :7J

-

-

112.6J

-------0

\5/95

---'-

2.4J

--~--------~-----~-------

--

2.4J

-

~----0

1*11/95

------------------------------------

----0

---------0

Notes:- = Indicates compound was not detected.J = Estimated Value (including results reported below the detection limit)

*XI = Duplicate sample from Monitor Well Fl during May 1995, and Monitor Well Cl during November 1995..

i \jlcoavaiuiujls\lW5\lalilci\l.l 5 'J.xli


Table 3-7. Summary of Analytical Results for Groundwater from Deep Bedrock Monitor Wells During

1995, Alcoa-Davenport Works, Riverdale, Iowa.

Pa°e 1 of 2

COMPOUND

1, ,1-Trichloroethane1. .2,2-Tetrachloroethane

1, ,2-Trichloroethane

1, -Dichloroethane

1, -Dichloroeihene

1,2-Dichloroethane

1,2-Dichloroethene (Total)

1 .2-Dichloropropane

2-Chloroethyl vinyl ether

Acrolein

Acrylonitrile

Benzene


Bromoform

Bromomethane

Carbon tetrachloride

Chlorobenzene

Chloroethanc

Chloroform

Chloromethanc

Dibromochloromethane

Ethylbenzene

Methylenc chloride

Tetrachloroethenc

Toluene

TrichloroetheneVinyl chloridecis-L3-Dichloropropene

trans- 1 ,3-Dichloropropene

TOTAL VOCS

PCBs:


Aroclor-1232

Aroclor-1242

Aroclor-1248

Aroclor-1254

Aroclor-1260

TOTAL PCBs

WELL

DATE

UNITS

ug/L

ug/L

ug/L

ug/L

ug/L

ug/L

ug/L

ug/L

ug/L

ug/L

ug/L

ug/L

ug/L

ug/L

ug/L

ug/L

ug/L

ug/L

ug/L

ug/L

ug/L

ug/L

ug/L

ug/L

ug/L

ug/Lug/Lug/L

ug/L

ug/L

ug/L

ug/L

ug/L

ug/L

ug/L

ug/L

ug/L

ug/L

AD

5/95 11/95

--

-

—

--

--

0

0

--

0

0

AX

5/95 11/95

--

0

--

0

BD

5/95 1/95

4.7J

4.7J

0 0 0

3.6J

3.6J

CD

5/95 11/95

--

0

0 0

-

--

DD

5/95 1/95

7

100

84

0 191

0 0

9

85 .

15

no

219

ED

5/95 1/95

--

--

--

--

--

0

0 0

--

--

-

--

--

0

FD

5/95 1/95

--

--

--

-

--

0

0 0

--

--

-

--

-

--

0

~

0

Notes:

= Indicates compound was not detected.

J = Estimated Value (including results reported below the detection limit)*XD = Duplicate sample from Monitor Well KD during May 1995, and Monitor Well FD during November 1995."XX = Duplicate sample from Monitor Well AX during November 1995.

i.\alcoa\aiuHuls\]'W5\Libles\O_ 5_l> xls


Table 3-7. Summary of Analytical Results for Groundwater from Deep Bedrock Monitor Wells During1995, Alcoa-Davenport Works, Riverdale, Iowa.

P a ° e 2 o f 2

COMPOUND

l.l.l-Trichloroethane1 , 1 .2,2-Tetrachloroethane1 , 1 ,2-Trichloroethane1,1-Dichloroethane1,1-Dichloroethene1.2-Dichloroethane1,2-Dichloroethcne (Total)1 ,2-Dichloropropane

2-Chloroethyl v iny l etherAcrolein

AcrylonitrileBenzeneBromodichloromcthaneBromoformBromomethaneCarbon tetrachlorideChlorobenzcneChloroethaneChloroformChloromethaneDibromochloromethane

EthylbenzeneMethylene chlorideTetrachloroetheneTolueneTrichloroetheneVinyl chloridecis- 1 ,3-Dichloropropene

trans- 1,3-Dichloropropene

TOTAL VOCS

PCBs:


Aroclor-1232Aroclor-1242Aroclor-1248Aroclor-1254Aroclor-1260

TOTAL PCBs

WELLDATE

UNITS

ug/Lug/Lug/L-ug/Lug/L

ug/Lug/L^ug/LUg/L

ug/L

ug/Lug/Lug/Lug/Lug/Lug/Lug/Lug/Lug/Lug/Lug/Lug/Lug/L

ug/Lug/Lug/Lug/Lug/L

ug/L

ug/L

ug/Lug/L

ug/Lug/L

ug/Lug/Lug/L

ug/L

CD5/95 11/95

36

-

--

--

-

36

0

X52

-

--

--

52

0

HX5/95 11/95

V9J

--

-

2.3J •

5.2J

0

2.63

-

-

2.6}

0

}\5/95 11/95

2.11

30

30

62.1}

0

--

22

28

50

K.D5/95 1/95

-

-

-

0

0 0

--

--

--

0

0

*\D5/95 11/95

--

--

--

0

0

--

--

-

-

0

0

"XX11/95

-

0

0

^T065/% 11/95

46J

1.500

92J2.400

590220

4.848J

0

1.800

2.500

560

260

5,120

0

Notes:= Indicates compound was not detected.

J = Estimated Value (including results reported below the detection limit)"XD = Duplicate sample from Monitor Well KD during May 1995, and Monitor Well FD during November 1995.""XX = Duplicate sample from Monitor Well AX during November 1995.i.\alcoa\animall\l9VS\lablcs\ll


Table 3-8. Summary of VOC Analytical Results from Groundwater from Monitor Well LI andResidential Well BE236 during 1995, Alcoa-Davenport Works, Riverdale, Iowa.

Compound

1,1,1-Trichloroethane

, 1 ,2.2-Tetrachloroethane

, 1 ,2-Trichloroethane

,1-Dichloroethane

,1-Dichloroethene

,2-Dichloroethane

,2-Dichloroethene (Total)

1 ,2-Dichloropropane

2-Butanone

2-Hexanonc

4-Methyl-2-pentanone

Acetone

Benzene


Bromoform

Bromomethane

Carbon disulfide

Carbon tetrachloride

Chlorobenzene

Chloroethane

Chloroform

Chloromethanc

Dibromochioromethane

Ethylbenzene

Methylene chloride

Styrene

Tetrachloroethene

Toluene

Trichlorocthene

Vinyl chloridecis- 1.3-Dichloropropene

trans- 1.3-DichloropropeneXylenes (Total)

TOTAL VOCS


Aroclor-1232

Aroclor-1242

Aroclor-1248

Aroclor-1254

Aroclor-1260

TOTAL PCBs

Reporting Limit

(ug/L)

1.0

1.0

1.0

1.0

1.0

1.0

1.0

1.0

10.0

10.0

10.0

10.0

.0

.0

.0

.0

.0

.0

.0

.0

.0

.0

.0

.0

.0

.0

.0

.0

.0

.0

.0

.0

.0

0.50.5

0.5

0.5

0.5

1.01.0

LI

2/95 5/95 8/95 11/95

„

..

—..

..

—4.2 5.7 8.2 8.9..

..

..

--..

-

..

„

..

..

..

..

..

..

..

..

—..

„

—-

4.2 3.6 *•£ 3

**

-..

-

8.4 9.3 11.7 11.9

NA -- NA NANA -- NA NA

NA -- NA NA

NA -- NA NA

NA -- NA NA

NA -- NA NA

NA -- NA NA

NA 0 NA NA

BE236

2/95 5/95 8/95 11/95

NA NA

NA NA

NA NA

NA NA

NA NA

NA ' NA

NA NA

NA NA

NA NA

NA NA

NA NA

NA NA

NA NA

NA NA

NA NA

NA NA

NA NA

NA NA

NA NA

NA NA

NA NA

NA NA

NA NA

NA NA

NA NA

NA NA

NA NA

NA NA

NA NANA NANA NA

NA NANA NA

0 0 NA NA

NA NA NA NA

NA NA NA . NA

NA NA NA NA

NA NA NA NA

NA NA NA NA

NA NA NA NA

NA NA NA NA

NA NA NA NA

Notes:

-- = Indicates compound was not detected.

VOCs analyzed by method 8260

NA = Not Analyzed i.\ilcoa\aiuuulsM'»SMab!ei\l.l 1 v.xl


Table 3-9. Summary of Analytical Results for Groundwater from Former Waste Disposal Site Monitor WellsDuring 1995, Alcoa-Davenport Works, Riverdale, Iowa.

Compound1, ,1-Trichloroethane, ,2,2-Terrachloroethane, ,2-Trichloroethane, -Dichloroethane, -Dichloroethene,2-Dichloroethane,2-Dichloroethene (Total),2-Dichloropropane

2-Chloroethyl vinyl etherAcroleinAcrylonitrileBenzeneBromodichloromethaneBromoformBromomethaneCarbon tetrachlorideChlorobenzeneChloroethaneChloroformChloromethaneDibromochloromethaneEthylbenzeneMethylene chlorideTetrachloroetheneTolueneTrichloroetheneVinyl chloridecis- 1 ,3-Dichloropropenetrans- 1 ,3-Dichloropropene

TOTAL VOCS

WellDate

Unitsug/Lug/LugfLug/Lug/Lug/Lug/Lug/Lug/Lug/Lug/Lug/Lug/Lug/Lug/Lug/Lug/Lug/Lug/Lug/Lug/Lug/Lug/Lug/Lug/Lug/Lug/Lug/Lug/L

ug/L

GM-4R5/95 11/95

-~~---------

2.7J----~-------------~~

2.1}

~~

---- .~~~-~

3.7J--------------~-----

3.7J

GM-6R5/95 11/95

--~--~28~~-~----------~---~--~

2.7J-~

30.7J

-~-----14~--~~------~---------~-~

7.2J-~

21.2J

GM-105/95 1 1/95

-~----

4.9J------------------

2.4J~

3.9J----

11. 2J

---

4.4J--26------------~-------

4.9J3.6J--

38.9J

GM-12R5/95 1 1/95

~----------------------------------

0

--~---

720-------------------

690--

1,410

AS5/95 1 1/95

~-

'--5.2J--

300~-~---

' -----~---~

. —--74--

379.2JPCBs:Aroclor-1016Aroclor-1221Aroclor-1232Aroclor-1242Aroclor-1248Aroclor-1254Aroclor-1260

TOTAL PCBs

ug/L" ug/L

ug/Lug/Lug/Lug/Lug/L

ug/L

NANANANANANANA

NA

NANANANANANANA

NA

NANANANANANANA

NA

NANANANANANANA

NA

NANANANANANANA

NA

NANANANANANANA

NA

NANANANANANANA

NA

NANA

NANANANANA

NA

-~-~16--

16

------40--------------~~-~--

7.5J--

47.5J

NANANANANANANA

NANotes:~ = Indicates compound was not detected.

J = Estimated value (including results reported below the detectionNA = Not analyzed

limit)


NORTH

_pf(OPERTY_LiNE_

u

SCALE

ALCOA PLANT

1000 FT

~BXPLAHATTOTT

(5T BTDfOC* MONITOR *flL £VfP f DEC?)

• BCDtOO MONITOR WtU (DEC?)

(•f' BCDPOCK HONITO* WELL (INFCPuEDUIC)

rw-oi0 AtCOA PRODUCTION <VtLL

O^'BLDVOCK MONITOR WELL (SHALLOW)

GERAGHTY? MILLER, INC.

DRAWING CONFIDENTIAL: THIS DRAWINGAND AU r*DftUAT1ON CONTAJTCD THEREON tSAND SHALL REWAJN THE PROPERTY OF CCflACHTY* liLLEX. HC. AS AN NSmUWCNT OF PflOFTS-SOHAL SPMCE. THIS VTOPUATION SHAil MOTBE USCD W WHOLE OR H PART ftTTHOUT THEFUU KMQWLEDCC AND PRIOR KRrTTEN CONSENTOf CERACHTY * MILLER HC

SCALE VERIFICMIQH

USE 10 vwirr FICURC

no. ix i jo?

CXMCO ffr: AV.

LOCATION OF BEDROCK M O N I T O R I N G WELLSAND PLANT PRODUCTION WELLS

AUOA-DAVDIPOP.I WORKS

FIGURE

2-1

l/lI—o:

FENCE

"1O

LIMIT OF FORMERWASTE DISPOSAL SITE

OUTFALL -DITCH 003

FORMERWASTE

DISPOSALSITE

INTERCEPTION ,,"\V//x '

EXPLANATION

MONITOR WELL

OIL COLLECTION MANHOLE


Environmental Services

LOCATION OF SHALLOW MONITOR WELLS,OIL INTERCEPTION TRENCH ANDCOLLECTION MANHOLES AT THEFORMER WASTE DISPOSAL SITE

ALCOA-DAVENPORT WORKS

FIGURE

2-2

Figure 2-3. Monthly Precipitation for 1995, Quad Cities Airport, Moline, Illinios.

8.00

7.00

o.oo

MONTH

i:\ateoa\anlrpts\l995\fiQures\pdpf2_3.xlsGERAGHTY & MILLER, INC.

Figure 2-4. Estimated Groundvvater Withdrawal from Production Wells During 1995, Alcoa-Davenport Works, Riverdale, Iowa.

14,000,000

12,000,000

10,000,000

QIIIa.

=> 8,000,000

CO

O

< 6,000,000

4,000,000

2,000,000 •

0 •Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec

i:\alcoa\antrpts\1995\figures\pvotr2_4.j<jjGERAGHTY & MILLER, INC.

Figure 3-1. Hydrograph of Water-Level Elevations from Selected Shallow Monitor Wells During 1995, Alcoa-Davenport Works, RiverdaleIowa.

575.00

570.00

tn 565.005

O

Itil

560.00

555.00

550.00

Jan Feb Mar Apr May Jun Jul

MONTH

Aug Sep Oct Nov Dec

FT MSL = Feet above mean sea level.

l:Valcoa\anlrprts\1995\liourM\tigf3_1_3.xt3


Figure 3-2. Hydrograph of Water-Elevations from Selected Intermediate Depth Bedrock Monitor Wells During 1995, Alcoa-DavenportWorks, Riverdale Iowa.

570

565

560

- 555

g<

550

545

540

535

530

—•— Fl

-•-LI

—A—HI

-*— Gl

-•-Dl

Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec

MONTH

MSL = Feet above mean sea level.

i:\alcoa\ajilrpis\ I MS\fiputsMign_ I _3.di


Figure 3-3. Hydrograph of Water-Level Elevations from Selected Deep Monitor Wells During 1995, Alcoa-Davenport Works, Riverdale,Iowa.

575

570

565

560

t 555

o< 550

LU

545

540

535

530

-FD

-ED

-BD

-AD

-DD

Jan Feb Mar Apr May Jun Jul

MONTHS

Aug Sep Oct Nov Dec

FT MSL = Feet above mean sea level.

i \alcoa\anbpw\199J\Tipirej\h(nj_.Vxlj GERAGHTY& MILLER, INC. W

IIIIII

APPENDIX A

I 1995 QUARTERLY WATER LEVEL ELEVATIONSAND GROUNDWATER CONTOUR MAPS

• FROM INTERMEDIATE-DEPTH BEDROCK MONITOR WELLS

IIII1IIIIB GERAGHTY & MILLER, INC.

PLAWINORIH

570—

EXPLANATION

- *- DIRECTION or GPOUNDWATEB FLO*

559.86 WATER-LEVEL ELFVATIOM (MSL)

•560* CROUNDWATER CQNTOUP

CONTOUP INTERVAL 10



DRAWING CONFIDENTIAL: THIS DRAWINGAND ALL INFtJRUATlON CO Ml AJ NED THEREON SAND SH*U PEUAIN TWE PROPCRTT Of CERACHTYft ULLER. INC. AS AH MSTRUVENT Of PROFtS-SIONAl SOMCC. THIS INFQRlUTION SMALL NOTEC USED IN WHOLE OR IN PART WTTHOUT THEFULL KNOWLEDGE AND PRttft WRITTEN CONSENTOf GCHACHTY A MILLER. INC.

SOLE VERIFICATION v*M3r\ I PtOt ICC:

CX CXO BY: *.«.

DATE: 20NOW1

DISTRIBUTION OF WATER-LEVEL ELEVATIONSAND GROUNDWATER CONTOURS DEPICTINGFLOW IN INTERMEDIATE DEPTH BEDROCK

MONITOR WELLS F E B R U A R Y 7-8, 1995

FIGURE

A-1«LCOA-c»vtllfOPI

, 5(39.09

f. ""}._£>» OPERTCJJN

ALCOA PIANT

(•? BEDROCK MONfTOB WCLL

ft 8 ALCOA PffODUCIiOM WEL

»- DIRECTION O* FLOW

l560« CROUNOW*TE« CONTOUR

563.01 WATCR-LlVtL rilV^TION (MSL>

CONIOUB INTERVM 10 ritl



DRAWING CONFIDENTIAL: THIS DC**IMCAND ALL NFORUATK>N COKTAINED THEREON reAND StWL REMAIN TMC PROPERTY OF CEB*CHTT* MLLER. NC. AS AN INSTRUUCNT Of PROrtS-SKDHM SEfMCE. TWS IHFOPMATDN SH*LL NOTBE WED M WHOLE OR IN PART WITHOUT THEFXJLL KNOWLEDGE AND PROR WRRTtN CONSENTOf COVCMTY A MILLER. INC.

SCALE VEPinCATION

ust TO ' Pirf ncuRtl*EPPOOUCriOrJ SCALE

DATE: 1BNOVO*

DISTRIBUTION OF WATER-LEVEL ELEVATIONSAND GROUNDWATER CONTOURS DEPICTING

FLOW IN INTERMEDIATE DEPTH MONITOR WELLSM A Y I I , 1995

ALCOA-QiVCnPGRT WORKS

FIGURE

A-2

PLANINORTH

ALCOA PLANT

»- DIRECTION Of FLOW

•560" GROUND-WATER COVTOUR

560.95 WATEB-LIVtL E l f V A T I O N (MSI)

CONIOUB iMTEffVAl 10 fm



DRAWING CONFIDENTIAL: THS OR-*INCAND AU. «roRu*TiON CONTAJNED THEREON tsAND SH*U. REMAIN ThE PROPERTT OF CER*CMTYA HIU£R. WC. AS AH IHSTRUHEKT OF PROFES-SIONAL SERVICE. THIS [NFORMATON SHUL HOTBE USED « WHOU OR IN PART WITHOUT THEFULL KNOWLEDGE AND PRCR WRITTEN CONSENTOF CCRACMT1 * HBLLCF. INC.

SCALE vEPinc*noNI NO. 0*41302

HCD>\1QW«SOI\ PU)T Slit: DISTRIBUTION OF WATER-LEVEL ELEVATIONSFROM INTERMEDIATE DEPTH MONITOR WELLS AND

G R O U N D W A T E R CONTOURS DEPICTING FLOW INTHE BEDROCK A Q U I F E R , AUGUST 7 AND 8, 1995

ALCOA-DAVEUPORT

FIGURE

A-3

ALCOA PLANT

BtOSOCX MOHHOfl WILL (INTCPyCDIATC)

ALCOA PRODUCHOM MIL

- to- OIRECIIOM OT FLOW

•560" CROUNOWJUCR CONTOUR

56120 WATCR-LIVCL ELrVATIO* (MSL)

CONTOUl INTCRVAl 10 t t t l

GERAGHTY& MILLER, INC.TlVlTOTlTT'KTllQ.t O8TVICCS

DRAWING CONFIDENTIAL: THIS DRAWINGAND AH NFORUATKM CONTAINED THEREON ISAND SMALL RCUAJN THE PROPERTY QF GERACMTYft UU£R. MC. AS AN INSTRUHCNT Of PROFES-SIONAL SERVICE. T>fS INFORMATION SH*a HOTBt USED M WHOLE Ofl IN PART WITHOUT THEFULL KNOWLEDGE AND PRDft WRlTTlN CONSENTOF CERACKTV * MLLfft. INC.

I HO: O-C1JO3*tCQ*\[DVA\OT\ I HOI fit: DISTRIBUTION OF WATER-LEVEL ELEVATIONS

AND G R O U N D W A T E R CONTOURS DEPICTING FLOWIN INTERMEDIATE BEDROCK MONITOR WELLS

NOVEMBER 7, 1995

FIGURE

A-4

IIIII

APPENDIX B

I 1995 QUARTERLY WATER-LEVEL ELEVATIONSAND GROUNDWATER CONTOUR MAPS

• FROM DEEP BEDROCK MONITOR WELLS

I

I

I

I

I

I

I

I

I

I

• GERAGHTY & MILLER, INC.

SCALE

piV*

EXPLANATION

(gf * BEDROCK MONITOR WEU (VtfY OCEP)

-.AD0 MDBOCK MONITOR WILL (Off]

f ALCOA PRODUCTION WELL

^- DIFCCIION OF C»OUNDWAIER FLOW

551.5B WAlER-LEVfL ELEVAIIOH (U5l)

"560" CROUHDWATER CON10UP

CONTOUP INTERVAL 10 Utl



ORAWNG CONFIDENTIAL: THS DRAWINCAHO ALL INFOKMAT1ON CON1MHEO TKRtQH EAND SK«U RCUAJN THE PflOPERTT Of CCRACHTYA ULLER. INC. AS AN NSTRUVCNT Of PROFES-SIONAL SEfMCE. TUS IWOP1UTON Stua MOTBE USED IN WHOLE OR IN PAffT MTHOUT THEfUU. KNOWUDCE AND PRIOR WRIHEH CONSENTOF GCRAGKTY *- UllLER. INC.

USE TOFEPMOUCTION 5C*t£

"ROJtCl IK): 0«OiJOI

DATE: IOHWB1DATE. UNOVM

0*ID UHCVM


FLOW IN DEEP MONITOR WELLSFEBRUARY 7-8, 1995

ALCO*-DAVEH°ORT WORKS

FIGURE

B-1

SCALE

ALCOA PLANT

I EXPLANATION"

BEDROCK MONFTOR WILL (VERY DEEP)

BIDBOCK MOH1IOH WCLL (DEEP)

ALCO* PRODUCTION WflL

^- DIPCCTION or now

560" CROUNDWATFft CONTOUR

554.21 WATfR-LTVtL CLTV*T10»* (MSL)

CONTOUR INTERVAL tO rECT



DRAWING CONFIDENTIAL: TUS DRAWINGAND ALL MF-ORUATION CONTAINED THEREON isAND SrtMJL ROWN THt PROPERTY OF GERACHTYA MILLER. WC. AS AM INSTRUMENT Of PROFES-SIONAL SERVICE. IMS INFORMATION SWU. NOTBE USED N WHOLE OR IN PART WITHOUT THEFULL UIOWLCDCC AHD PRIOR WRITTEN CONSENTOF CERAOiTY * MLLER. INC,

SCALE VERinCATiQH

USE TOWROOUCTIOH SCALE

PWOJECT NO.: OO1J01

CKtCKID ff1*. A.«.DATE: HDNCW»lDATE: ie«cvn


FLOW IN DEEP MONITOR WELLSMAY 11. 1995

ALCOA- DAVEHPORI WORKS

FIGURE

B-2

ALCOA PLANT

550

BEDROCK MOMITOR WELL (VEITr DdP)

BFDBOCk UOMITOR WELL (DEEP)

ALCCW OBOOUCTIOh WTLl



DRAWING CONFIDENTIAL: TWS D«**INGWO Aa ^FORMATION CONTAINED TV€R£ON ISAMD Smil REMAIN THE WOPCHfr Of CCflACHTY* MLUP, K. AS AM IKSTRUUCNT OF PROftS-SJONAL SERVICE. TUS IHFORUAT10N SH«U. HOTBE USED M WHOLI OR IN PART WfTHOJT THEruii. KHOWlfDCC AW PRDR WRITTEN CONSENTOF COWXTf * ALER. INC.

TrtS BAA REPRESENTSOtC NCM ON THE

DRAWMC:

USE TO VWFY FlOJffi

DMHTO VT: «T3

DISTRIBUTION OF WATER-LEVEL ELEVATIONSFROM DEEP MONITOR WELLS AND GROUNDWATER

CONTOURS DEPICTING FLOW IN THE BEDROCKAQUIFER, AUGUST 7 AND 8, 1995

»LCOA-D«VOIPORI WORKS

FIGURE

B-3

570 -

--""^U^^rr

EXPLANATION"

BEDROCK MONITOR WELL (VERY DCEP]

BEDROCK MONITOP WELL (DEEP)

fl ALCOA PRODUCTION WtLL

^- DIRECTION Of FLOW

•560— GBOUNDWATEQ CONTOUP

553.35 WATEP-LEVfL TLEVATION (MSI)CONTOUR INTEPVAL 10 TEE^

GERAGHTY& MILLER, INC.nuiTGmri£Tit&l Services

\

DRAWING CONFIDENTIAL: THS DRAWINGWO *LL INFORMATION CONTAINED TnO>CON KAND SHtU. REMAJN THE PROPERTY Of GCRAGHTY* WLLER. INC. AS M INSTRUMENT OF PROFES-SIONAL SERVICE. THS INFORMATION SKILL NOTS£ USED IN WHCLC OR IN PART WITHOUT THEFULL KNOWLEDGE AMD PRIOR WRITTEN CONSENTOF GCRACHTY A KILLER, IK.

SCALE VERIFICATION

THIS &f* REPRESENTSOIJE «CH ON THE

DRAWIHG:

USE TO ^WIFY FIGUREPEPPCOUCT10H SC*£

1 HO^ GHQI 302<M.CQ*MQ-.*\Or\

CXCXCO BV: *.*.CV*TL KNCV91

DISTRIBUTION OF WATER-LEVEL ELEVATIONSAND GROUNDWATER CONTOURS DEPICTINGFLOW IN DEEP BEDROCK MONITOR WELLS

NOVEMBER 7, 1995*LCO*-DAVENPORT WORKS

FIGURE

B-4

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APPENDIX C1995 QUARTERLY FREE-PHASE PRODUCT THICKNESS

MAPS AT THE FORMER WASTE DISPOSAL SITE

GERAGHTY & MILLER, INC. IJ/*

FENCE

UM1T OF FORMERWASTE DISPOSAL SITE

FORMERWASTE

DISPOSALSITE

EXPLANATION

MONITOR WELL


ND NO PRODUCT DETECTED

0.32 PRODUCT THICKNESS IN FEE!



PRODUCT THICKNESS IN M O N I T O R WELLSAND COLLECTION MANHOLES AT THE

FORMER WASTE DISPOSAL SITEON FEBRUARY 7-8, 1995


C-1

FENCE


FORMERWASTE

DISPOSALSITE

OILINTERCEPTIONTRENCH

OUTFALLDITCH 003

SCALE 250 R

MONITOR WELL



1.06 PRODUCT THICKNESS IN TEET




FORMER WASTE DISPOSAL SITEON MAY 10, J995ALCOA-DAVENPORT WORKS

C-2

FENCE

0.27


FORMERWASTE

DISPOSALSITE

OIL — -INTERCEPTIONTRENCH

OUTFALL -DITCH 003

SCALE250 FT

MONITOR WELL



1.80 PRODUCT THICKNESS IN FEET




FORMER WASTE DISPOSAL SITEON AUGUST 7 AND 8, 1995

ALCOA-DAVENPORT WORK'^

FIGURE

C-3

FENCE


OUTFALLDITCH 003

FORMERWASTE

DISPOSALSITE

EXPLANATION

MONITOR WELL



1.35 PRODUCT THICKNESS IN FEET



PRODUCT THICKNESS IN M O N I T O R WELLSAND COLLECTION" MANHOLES AT THE

FORMER WASTE DISPOSAL SITEON NOVEMBER 7, 1995


FK.il JRE

C-4

II1IIi APPENDIX D

I 1995 QUARTERLY ADJUSTED WATER-LEVEL MAPS AND GROUNDWATERLEVEL CONTOUR MAPS AT THE FORMER WASTE DISPOSAL SITE

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FENCE

IJMIT OF FORMERWASTE DISPOSAL SITE

OUTFALLDITCH 003

FORMERWASTE

DISPOSALSITE

X(£ 561.75GM-04R

EXPLANATION

CM-08D562.29X

MONITOR WELL


562.09 GROUNDWATER ELEVATION.(FEET ABOVE MEAN SEA

LEVEL)

NM NOT MEASURED



ADJUSTED GROUNDWATER ELEVATIONS INMONITOR WELLS AND COLLECTION MANHOLES

AT THE FORMER WASTE DISPOSAL SITEON FEBRUARY 7-8, 1995


FIGURE

D-1

LJMIT OF FORMERWASTE DISPOSAL SITE

OUTFALLDITCH 003

SCALE 250

MONITOR WELL


GROUNDWAIER FLOW DIREUION

-564- GROUNDWATER CONTOUR

CONTOUR INTERVAL 2 FEET


Environmental SeTv^ces

ADJUSTED GROUNDWATER LEVEL CONTOURS-DEPICTING FLOW CONDITIONS AT THE

FORMER WASTE DISPOSAL SITEON FEBRUARY 7-8, 1995


D-2

FENCE


OUTFALLDITCH 003

FORMERWASTE

DISPOSALSITE

OILINTERCEPTION .-;"'.,'> /TRENCH ,-'\'>-"' ''x

EXPLANATION

r MONITOR WELL


CM-OBDS64.49/

562.81 GROUNDWATER ELEVATION(FEET ABOVE MEAN SEALEVEL) '

NM NOT MEASURED


Environmental SeT~uices


AT THE FORMER WASTE DISPOSAL SITEON MAY 10, 1995ALCOA-DAVENPORT WORKS

FIGURE

D-3

FENCE


OUTFALLDITCH 003

MONITOR WELL


GROUNDWA1ER FLOW DIREC1ION




Environmental Serinces

ADJUSTED GROUNDWATER LEVEL CONTOURSDEPICTING FLOW CONDITIONS AT THE

FORMER WASTE DISPOSAL SITEON MAY 10, 1995


Fh,hRF.

D-4

FENCE

LIMIT OF FORMER —WASTE DISPOSAL SITE

////c-A'V

OUTFALLDITCH 003

FORMERWASTE

DISPOSALSITE

568.58

®CM-I 8

^:-///OIL — " .•.•'•••..///INTERCEPTION .. "• • '/,'TRENCH

0-2, X >

562.06 O^5 ';'-''"' "

SCALE 250 FT

EXPLANATION

MONITOR WELL


560.82 GROUNDWATER ELEVATION(FEET ABOVE MEAN SEALEVEL)



ADJUSTED GROUNDWATER ELEVATIONS INMONITOR WELLS AND COLLECTION M A N H O L E S

AT THE FORMER WASTE DISPOSAL SITEON AUGUST 7 AND 8, 1995


D-5

FENCE


OUTFALL -DITCH 003

560

SCALE• 250 FT

MONITOR WELL


GROUNDWA1ER FLOW DIRECIION





ADJUSTED G R O U N D W A T E R ELEVATIONCONTOURS DEPICTING FLOW C O N D I T I O N SAT THE FORMER WASTE DISPOSAL SITE

ON AUGUST 7 AND 8, 1995ALCOA-DAVENPORT WORKS

FI ol.J f-.L

D-6

FENCE


OUTFALLDITCH 003

FORMERWASTE

DISPOSALSITE

EXPLANATION

MONITOR WELL


56^86 GROUNDWATER ELEVATION(FEET ABOVE MEAN SEALEVEL)

NM NOT MEASURED


Environmental Sennces


AT THE FORMER WASTE DISPOSAL SITEON NOVEMBER 7, 1995


D-7

FENCE


ORMERASTE

ISPOSALSITEOUTFALL —v /

DITCH 003

EXPLANATION

MONITOR WELL


—— GROUNDWATER FLOW DIRECTION




Environmental Sernnces

ADJUSTED GROUNDWATER LEVEL C O N T O U R SDEPICTING FLOW C O N D I T I O N S AT THE

FORMER WASTE DISPOSAL SITEON NOVEMBER 7, 1995


D-8

IIIII™ APPENDIX E

| 1995 QUARTERLY SITE-WIDE WATER QUALITY MAPS

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SCALE

ALCOA PLANT

(ND)1000 rr

^EXPLANATION

{*} 8 CO ROCK UONITOR WtLL (INTtPwEDIATt)

(3.8) CUMULATIVE VOC COMCtNIRATION (uj/l)

(MO) »*OT OtTECIED

J INDICATES ESTIMATED CONCENTPAT'ON



DRAWING CONFIDENTIAL: THS DMWINGAMD ALL INFORMATION CONTAINED THCREC,?. SAfC SHALL REUAM THE PROPERTY OF GCRAGHTY* MLLER. INC. AS AN WSTRuyENT OF PROFES-SIONAL SOWCC TKS INFORMATION StULL NOTBE USED IN WHOLE OR IN PART WITHOUT THEFULL KNOWLEDGE AND PR*" WRITTEN CONSENTOF GERACHTY A MILLER. INC.

SOLE VEPIFIQTIQN

I REPRESENTSONE INCH ON T>£

USt TO.VtRIFYREFTOOLCTIOM SOW

PROJECT HO.: d-OJOr I ni£ KO: OTmow

CXUWMO- N.O1A\[QUA\OT\ 1 101 1CL

DATE: i fliOv*4

CUMULATIVE VOC CONCENTRATIONS DETECTEDIN INTERMEDIATE BEDROCK MONITOR

WELLS IN MAY, J995ALCOA-DAVENPORT WORKS

FIGURE

E-1

PLANINORTH

SCALE

1000 FT

HlGH'lM-67

__L

AJ l_l

*=*

kp

k

, I I I

PW-04

L_!d--

ID

PROPERTY LINE

r^ALCOA PLANT

•^^..•;.;i; -;"(ND)

EXPLANATION_iX

^T BCDROCr MONITOR ftEll (VCVY HCP)

^T KOROCK UONItOR «riL (DffP^

0 e ALCOA PRODUCTION WELL

(N5) NOT JUUPKD

(NO) NOT OtTtCItD

(«.7J)CUMUl>TIV[ VOC CONCCKT»»n» lug,'

I INDIC1TIS CSTUUTCD CO-KUTRATION

f GERAGHTY6^ MILLER, INC.


DRAWING CONFIDENTIAL: THIS DRAWING«C *L INFORMATION CONTAINED THE WON S«* SHALL REMAIN THE PROPCR7Y Of GERAGHTY* »i£R. lf*C. AS AH INSTRUMENT OF PROrES-SOHM. SDMCE. THS INFORMATION SHALL NOTtt. USED IN WHOLE OR IN PUTT WTHCUT Tr<FTJU KNOWUDCE AND PRIOR WRITTEN CONSENTOF CERAOHTY * MLL£R. INC.

SCALE VERIFICATION

MS UR REPRESENTSONE INCH ON THEORKIUM. DRAWMC:

USE TO VtOlCY FIGURE•EPWXXJCnON SCALE

(XCKED BY: *.».CUMULATIVE VOC CONCENTRATIONS DETECTED IN

DEEP BEDROCK MONITOR WELLS IN MAY, 1995

'LCOA-OvtNPOKT WORKS

FIGURE

E-2

EENCE

UMIT OF FORMERWASTE DISPOSAL SITE

OUTFALLDITCH

FORMERWASTE

DISPOSALSITE

INTERCEPTION .. ' >".TRENCH .. \ V>',

MONITOR WELL


ND NOT DETECTED

(2.7J) CUMULATIVE VOCCONCENTRATION (ug/1)

J INDICATES ESTIMATEDCONCENTRATION



CUMULATIVE VOC CONCENTRATIONS DETECTEDIN MONITOR WELLS AT THE FORMERWASTE DISPOSAL SITE IN M A Y , 1995


FIGURE

E-3

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ALCOA PLANT

FORMERWASTE

DISPOSAL /SITE "

EXPLANATION

(•f BCDWCX MON1TOQ WtLL (iNTCPMtOUTT)

{H.gJCUWULATTVC VOC CONCENTRATION (ug/l)

(ND) HOI HTtCIED

J IND'C*TTS CSTIM4TED C

GERAGHTY6? MILLER, INC.


DRAWING CONFIDENTIAL TusAM) All INFORMATION CONTAINED THCRCON 5AMD SHAU RDUH THE PROPERTY Of CCRACHTY* tOifR. INC. AS AN MSTRUHCHT Of PftOFES-5JOWL SOMCC. THS INFORMATION SHALL NOTee USED IN WMOU OR IN PART WITHOUT THEFULL KNOWUDCC AtC PRIOR WRITTEN CONSENTOf GERACKTY A MU£R. INC.

CUMULATIVE VOC CONCENTRATIONS DETECTEDIN I N T E R M E D I A T E BEDROCK MONITOR

WELLS IN NOVEMBER, 1995

FIGURE

E-4ALCO-DAVENPORT WORKS

HIGH""- CD.

PUNTNORTH

SCALE

3_ /r PROPERTY LINE

x-vJ I_J

ijTt, PW-04

ALCOA PLANT

§

EXPLANATION($f BEDROCK MONfTOR WELL (VERT KEP)

0 BCD«»OCC WOMITOB wfU (DEE»)

0" ALCOA rROOUCTION WELL

(MS) NOT 1AUPLEO

(ND) NOT DETECTED

(4.7J)CUMULATIVE VOC CONCENTPAT10N fufl/l

J INDICATES E5TIUATED COMCEHTRATtON

GERAGHTYsf MILLER, INC.

DRAWING CONFIDENTIAL: ins OWWINCAM) Ail INFORMATION CONTAINED THEREON SAND SHALL REMWN THE PROPERTY OF GERAGHTY* MLLCR. INC. AS AM WSTRUMENT Of PROFIS-StOWC SCRMCC. TMS INFORHAT10N 5HAU. NOTBE USED IN WHOLE OR IN PART WITHOUT THEFLU. KNOWLEDGE AND PRIOR WRITTEN CONSENTOf GERAGHTY ft MILLER, INC.

SCALE VERIFICATION

MVBW REPRESENTSONE INCH ON THEORiQNAL DRAWING:

USE TO VEPIFY FIGURERErrooucnor* SCALE

PAtXCCI NO.: 0x01302

owrrto Bf. P»TSOCWCD BY: *,«.

DATE: MNOvft

DATE; i6HOv»«

CUMULATIVE VOC CONCENTRATIONS DETECTED INDEEP BEDROCK M O N I T O R WELLS IN NOVEMBER, 1995

ALCOA-WvtNPORI

FIGURE

E-5

FENCE


OUTFALLDITCH 003

FORMERWASTE

DISPOSALSITE

INTERCEPTION x'\ V/VTRENCH • ' '

EXPLANATION

MONITOR WELL


NO NOT DETECTED

(3.7J) CUMULATIVE VOCCONCENTRATION (ug/l)

INDICATES ESTIMATEDCONCENTRATION



CUMULATIVE VOC C O N C E N T R A T I O N S DETECTEDIN MONITOR WELLS AT THE FORMER

WASTE DISPOSAL SITE IN N O V E M B E R , 1995


FIGURE

E-6

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