2005 REMEDIAL ACTION ANNUAL EFFECTIVENESS REPORT …including the results of investigations and system design, is provided in the CAPA Focused Investigation Data Report (Alcoa, 1998)

000053

Revision D-0 March 2006

C:\LAVACABA\RD_RA\RA Effectiveness Report 2005\2005RAAERrev1.doc i

TABLE OF CONTENTS

Page

LIST OF TABLES................................................................................................................................. ii LIST OF FIGURES .............................................................................................................................. ii LIST OF APPENDICES ....................................................................................................................... ii LIST OF ACRONYMS..........................................................................................................................iii 1.0 INTRODUCTION...................................................................................................................1-1

1.1 OBJECTIVE ..............................................................................................................1-1 1.2 CD/SOW REQUIREMENTS FOR THE RAAER........................................................1-1 1.3 SITE DESCRIPTION AND STATUS OF REMEDIAL ACTIVITIES ...........................1-2

2.0 OVERVIEW OF O&M AND PERFORMANCE MONITORING PROGRAMS........................2-1 2.1 CHLOR-ALKALI PROCESS AREA GROUNDWATER EXTRACTION AND

TREATMENT SYSTEM.............................................................................................2-1 2.2 CHLOR-ALKALI PROCESS AREA OFFSHORE SURFACE WATER SAMPLING ..2-2 2.3 LAVACA BAY SEDIMENT MONITORING ................................................................2-3 2.4 FINFISH AND SHELLFISH MONITORING...............................................................2-4 2.5 DREDGE ISLAND INSPECTIONS............................................................................2-5 2.6 CAPA SOIL CAP INSPECTIONS..............................................................................2-6

3.0 MONITORING RESULTS .....................................................................................................3-1 3.1 CHLOR-ALKALI PROCESS AREA GROUNDWATER EXTRACTION AND

TREATMENT SYSTEM.............................................................................................3-1 3.2 CHLOR-ALKALI PROCESS AREA OFFSHORE SURFACE WATER SAMPLING ..3-1 3.3 SEDIMENT MONITORING........................................................................................3-1 3.4 FINFISH AND SHELL FISH MONITORING..............................................................3-3

3.4.1 Red Drum Monitoring.....................................................................................3-3 3.4.2 Juvenile Blue Crab Monitoring.......................................................................3-6

3.5 DREDGE ISLAND INSPECTIONS............................................................................3-8 3.6 CAPA SOIL CAP INSPECTION ................................................................................3-8 3.7 VERIFICATION OF SITE CONDITIONS AND LAND USE .......................................3-8

4.0 CONCLUSIONS....................................................................................................................4-1 4.1 COMPARISONS TO PERFORMANCE STANDARDS .............................................4-1 4.2 PLANS FOR SUBSEQUENT MONITORING............................................................4-1 4.3 SUMMARY OF OVERALL REMEDY EFFECTIVENESS..........................................4-2

5.0 REFERENCES......................................................................................................................5-1

000054


C:\LAVACABA\RD_RA\RA Effectiveness Report 2005\2005RAAERrev1.doc ii

LIST OF TABLES

Table Title 3.1-1 CAPA Groundwater Treatment System Analytical Results, Treatment System Effluent 3.1-2 CAPA Groundwater Treatment System Analytical Results, Recovery Wells 3.1-3 CAPA Groundwater Treatment System Analytical Results, Air Stripper Effluent 3.1-4 CAPA Groundwater Treatment System Recovery Well Pumping Data 3.2-1 Cumulative CAPA Offshore Surface Water Sampling Results, Mercury 3.2-2 Cumulative CAPA Offshore Surface Water Sampling Results, Carbon Tetrachloride 3.2-3 Cumulative Diurnal Sample Results at Site LVB9009 3.2-4 CAPA Offshore Surface Water Sample Field Data 3.3-1 Summary of 2004 and 2005 Marsh Sediment Mercury Concentrations 3.4-1 Summary of 2005 Red Drum Tissue Mercury Results 3.4-2 Summary of Type I (α) and Type II (β) Errors 3.4-3 Mean Juvenile Blue Crab Tissue Mercury Concentrations

LIST OF FIGURES

Figure Title 3.1-1 Potentiometric Surface of Zone B Groundwater (2/28/05) 3.1-2 Potentiometric Surface of Zone B Groundwater (12/20/05) 3.2-1 CAPA Offshore Surface Water Sampling Stations 3.4-1 Trends In Red Drum Mercury Concentration 3.4-2 Distributions of Red Drum Tissue Mercury Data 3.4-3 Trends in Close Area Juvenile Blue Crab Mercury Concentrations

LIST OF APPENDICES

Appendix Title A Lavaca Bay Annual Sediment Monitoring Report 2005 B Lavaca Bay Finfish and Shellfish Monitoring Report 2005 C Dredge Island Inspection Report 2005 D CAPA Soil Cap Inspection

000055


C:\LAVACABA\RD_RA\RA Effectiveness Report 2005\2005RAAERrev1.doc iii

LIST OF ACRONYMS

CAPA Chlor-Alkali Process Area

CCND Calhoun County Navigation District

CDF Confined Disposal Facility

CERCLA Comprehensive Environmental Response, Compensation and Liability Act

DMPA Dredge Material Placement Area

DNAPL Dense Non-Aqueous Phase Liquid

EE/CA Engineering Evaluation/Cost Analysis

FS Feasibility Study

GPA Gypsum Placement Area

OMMP Operation, Maintenance and Monitoring Plan

NGVD National Geodetic Vertical Datum

RAAER Remedial Action Annual Effectiveness Report

RDR Remedial Design Report

RI Remedial Investigation

ROD Record of Decision

USEPA United States Environmental Protection Agency

000056


C:\LAVACABA\RD_RA\RA Effectiveness Report 2005\2005RAAERrev1.doc 1-1

1.0 INTRODUCTION

1.1 OBJECTIVE

This document is the 2005 Remedial Action Annual Effectiveness Report (RAAER) for the Alcoa

(Point Comfort)/Lavaca Bay Superfund Site (the “Site”) in Point Comfort, Texas. The RAAER is

required under a CERCLA Consent Decree/Statement of Work between Alcoa (Alcoa Inc. and

Alcoa World Alumina Atlantic, L.L.C) and the United States of America and the State of Texas,

which was entered in the United States District Court, Southern District on the effective date of

March 1, 2005 (United States et al., 2005).

Although actual monitoring data are submitted with the monthly reports as the analytical

information is validated, the objective of the RAAER is to combine the results of the previous

yearly performance monitoring into an integrated assessment of the progress towards achieving

the overall Site remediation goals.

1.2 CD/SOW REQUIREMENTS FOR THE RAAER

Per the Statement of Work attached to the Consent Decree, the RAAER:

“…shall be prepared to evaluate the effectiveness of the RA [Remedial Action] including, but not limited to, an evaluation of the performance of the hydraulic control system at CAPA, natural recovery of sediments in Lavaca Bay, trends in fish/shellfish tissue values, and an evaluation of O&M activities. In preparing the report, Settling Defendants shall use the O&M and Performance Monitoring data collected and any data collected during construction of the remedy. The Annual Effectiveness Report shall be submitted to EPA in accordance with the schedule contained in the Remedial Action Work Plan.”

The Remedial Action Work Plan (Alcoa, 2005a) specifies that the 2005 RAAER be submitted by March 30, 2006.

The Statement of Work attached to the Consent Decree states that specific topics to be discussed in the RAAER include:

• Site information; • Media description;

000057



• Treatment system description; • Treatment system performance; • Observations and lessons learned; and • Verification that site conditions have not changed and there have been no land use or

property development changes that may affect the remedial action.

1.3 SITE DESCRIPTION AND STATUS OF REMEDIAL ACTIVITIES

The Site is defined in the Consent Decree as:

“…the Alcoa/Lavaca Bay Superfund Site, generally consisting of the Plant, Dredge Island, Formosa Tract, and portions of Lavaca Bay, Cox Bay, Cox Creek, Cox Cove, Cox Lake (Cox Creek, Cox Cove, and Cox Lake are also known as Huisache Creek, Cove and Lake) and western Matagorda Bay located in Calhoun County, Texas, and areas containing hazardous substances depicted generally on the map attached as Appendix C.” (Note: map from Consent Decree not presented herein).

Although all areas of the Site were investigated during the Remedial Investigation, the risk

assessments indicated that only certain parts of Lavaca Bay, the Dredge Island, and two areas

on the Plant/Mainland (the Chlor-Alkali Process Area (CAPA) and the Witco Area) required

development of remedial action objectives and subsequent remediation. Remediation of the

Site, as described in the Record of Decision (EPA, 2001), consisted of actions that were

initiated prior to the ROD (some of which were completed prior to the ROD and some of which

are ongoing), and several proposed actions. This RAAER presents monitoring information that

reflects the effects of both the completed actions and the ongoing activities. The following

remedial actions have either been completed or represent an ongoing activity at the Site:

• Stabilization of the Dredge Island (completed as a non-time critical removal action prior to the ROD);

• Removal of CAPA sediment and sediment near Dredge Island (completed as a treatability study prior to the ROD);

• Extraction and treatment of groundwater at the CAPA (initiated as a treatability study prior to the ROD and continuing as an ongoing action under the Consent Decree);

• Dredging of the Witco Channel (completed as part of routine plant maintenance prior to the ROD);

• Installation of a soil cap at the CAPA, with institutional controls to manage exposure to soil (completed prior to the ROD);

• Removal of Building R-300 at the CAPA (completed prior to the ROD); • Natural recovery of sediments (ongoing activity); and • Institutional controls to manage exposure to finfish/shellfish (ongoing activity).

000058



The following remedial activities have not been completed:

• Installation of a Dense Non-Aqueous Phase Liquid (DNAPL) containment system (slurry wall vertical barrier) at the Witco Area (scheduled for completion in 2006);

• Installation of soil caps at the Witco Area, with institutional controls to manage exposure to soil (scheduled for completion in 2006);

• Dredging of the Witco Marsh (scheduled for completion in 2006); and • Enhanced natural recovery of the area north of Dredge Island (project schedule to be

determined based on availability of suitable capping material and/or evaluation of necessity for the action based on annual sediment sampling);

In addition to these remedial actions, the Consent Decree specifies certain performance

monitoring activities to evaluate the effectiveness of the remedy. The scopes of each of these

monitoring activities are contained in the Remedial Design Reports (RDRs) and/or Operation,

Maintenance and Monitoring Plans (OMMPs) attached to the Consent Decree. The Consent

Decree documents (provided in the indicated appendix) that govern operation, maintenance and

monitoring for currently completed or ongoing activities are:

• Chlor-Alkali Process Area RDR and OMMP (Appendix A); • Lavaca Bay Sediment Remediation and Long-Term Monitoring Plan OMMP (Appendix

H); • Lavaca Bay Finfish and Shellfish OMMP (Appendix I); • Dredge Island OMMP (Appendix D); and • Chlor-Alkali Process Area Soils RDR and OMMP (Appendix F).

The RDRs/OMMPs provide detailed descriptions of the performance monitoring that is

summarized in this RAAER. Although the general scopes of the relevant OMMPs are described

subsequently, the reader is directed to the RDR/OMMP documents for specific details about

each monitoring program. Due to the large size of the RDR/OMMP documents, they are not

reproduced here.

000059



2.0 OVERVIEW OF O&M AND PERFORMANCE MONITORING PROGRAMS

2.1 CHLOR-ALKALI PROCESS AREA GROUNDWATER EXTRACTION AND TREATMENT SYSTEM

The CAPA groundwater extraction and treatment system began full-scale operation in May

1998. The primary system components are four groundwater extraction wells, an air stripper

that removes volatile organic compounds from the groundwater, and a series of carbon vessels

that remove mercury. Ancillary piping, filters, pumps, tanks, etc. comprise the rest of the

system. The objective of the groundwater extraction system is to provide hydraulic control of

that portion of the dissolved mercury plume that is believed to contribute over 98 percent of the

mercury mass flux from Zone B groundwater to Lavaca Bay. A treatability test conducted in

1997/1998 indicated that an aggregate extraction rate of approximately 10 gallons per minute

(gpm) from the four extraction wells creates a cone of depression that extends parallel to the

shoreline along the line of wells.

The system has operated continuously since 1998, with only minor interruptions for

maintenance or trouble-shooting, or during power interruptions at the Point Comfort Operations

(PCO) facility. Detailed information for the CAPA groundwater extraction and treatment system,

including the results of investigations and system design, is provided in the CAPA Focused

Investigation Data Report (Alcoa, 1998) and CAPA Groundwater Treatability Study Data Report

(Alcoa, 1999).

Operations, maintenance and monitoring were conducted in 2005 in accordance with the CAPA

Groundwater RDR/OMMP (Consent Decree, Appendix A). The various maintenance activities,

operational checks and sampling requirements are summarized in Table 3-3 of the

RDR/OMMP. The discharge standards for the system effluent are shown in Table 3-1 of the

RDR/OMMP. A summary of the CAPA groundwater extraction and treatment system

performance is provided in Section 3.1.

000060



2.2 CHLOR-ALKALI PROCESS AREA OFFSHORE SURFACE WATER SAMPLING

The effectiveness of the CAPA groundwater extraction and treatment system has been

evaluated through system data and through the sampling of surface water offshore of the CAPA

where Zone B groundwater discharge historically occurred. During the Remedial

Investigation/Feasibility Study (RI/FS), surface water samples were collected offshore of the

CAPA that had measurable concentrations of mercury and carbon tetrachloride. Four focused

events were conducted. The first two events were performed at various locations and depths

before the CAPA groundwater extraction and treatment system was operating, to evaluate pre-

groundwater extraction mercury and carbon tetrachloride concentrations in Lavaca Bay surface

water. The results of the these two events showed elevated total and dissolved mercury

concentrations, as well as detectable carbon tetrachloride concentrations in almost all of the

samples collected. The presence of carbon tetrachloride in particular indicated that CAPA

groundwater was entering the bay, since no other sources of carbon tetrachloride exist at the

Plant (see Remedial Investigation Report, 1999b).

The third and fourth RI/FS focused CAPA shoreline surface water sampling events were

performed in June 1998 and June 1999, after the groundwater extraction and treatment system

was operational. These samples showed significant decreases in mercury and carbon

tetrachloride concentrations in all surface water samples collected, compared to pre-

groundwater extraction data, indicating that CAPA groundwater migration to Lavaca Bay was

effectively controlled. Furthermore, the concentrations of filtered mercury in the samples

decreased dramatically, consistent with the reduction of CAPA groundwater discharge as a

source of mercury to surface water. Another sampling event performed in 2003 confirmed these

conditions and the on-going effectiveness of the extraction and treatment system at that time.

To continue to monitor the effectiveness of the CAPA remedy, a surface water monitoring

program was developed, and was modeled after the RI/FS sampling events. The CAPA

Groundwater RDR/OMMP (Consent Decree Appendix A) describes the monitoring program.

The concentrations of mercury and carbon tetrachloride measured in surface water samples

collected under this monitoring program are compared to the State of Texas Surface Water

Quality Standards, which are shown in Table 3-2 of the RDR/OMMP and represent the

performance standards for this program.

000061



Two sampling events were conducted in 2005, during February and November, and the results

of those monitoring events are discussed in Section 3.2. The surface water monitoring will be

performed for two years to satisfy the requirements of the RDR/OMMP, at which time the

program will be re-evaluated.

2.3 LAVACA BAY SEDIMENT MONITORING

A key factor in the success of the Lavaca Bay remedy is the reduction in sediment mercury

concentrations through targeted sediment removal efforts, capping, enhanced natural recovery,

and/or natural recovery. The purpose of the sediment monitoring program is to verify that

source control and remedial measures have been effective in reducing sediment concentrations

to acceptable levels.

As described in the Lavaca Bay Sediment Remediation and Long-Term Monitoring Plan

(Consent Decree Appendix H), the sediment monitoring program is designed to evaluate

surface (0-5 cm) sediment mercury concentrations from open water and marsh areas within the

Closed Area. The boundaries of the Closed Area are defined in the Texas Department of

Health’s order against taking of finfish and shellfish for consumption. The 122 open water

sediment sample locations are located in a statistically-based grid through the Closed Area that

is consistent with sampling conducted for the original Remedial Investigation which also allows

for a comparison with historical mercury sediment levels as well as evaluating the data against

the numerical criteria established as the sediment remediation goals in the Consent Decree.

Surface sediment samples are collected from the seven largest marshes within the Closed

Area. The number of sub-samples used to yield a composite mercury concentration for each

marsh range from three to five depending on the relative size of each marsh. The marsh IDs

and number of sub-samples are:

Marsh ID Number of Sub-samples

1 5 5 5 7 3 11 5 15 3 14 3 19 4

000062



The open water and marsh sediment concentrations are compared to habitat-specific

remediation goals. The Consent Decree defines the performance standard for open water

sediment mercury concentration as 0.5 mg/kg dry weight for the average of all Closed Area

surficial open water sediment measurements. The performance standard for marsh sediments

is for the average mercury concentration of each marsh to attain 0.25 mg/kg dry weight.

Monitoring is to occur annually until the remediation goals are met for two consecutive events.

If either the open water sediment or the marsh sediment monitoring data attain the remediation

goal for two consecutive events, monitoring of that endpoint is complete, even if monitoring of

the other endpoint continues.

2.4 FINFISH AND SHELLFISH MONITORING

The purpose of the Lavaca Bay Finfish and Shellfish OMMP is to collect and evaluate data to

document whether the remediation goals have been met, and mercury levels in fish tissue have

been reduced such that the overall risk throughout Lavaca Bay approaches that which would be

present but for the historic Point Comfort Operations. Mercury tissue concentrations in red

drum are used as a surrogate of risk, and the remediation goal for Lavaca Bay will be met when

the mean mercury concentration of red drum collected in the Closed Area has recovered to the

mean level measured in red drum collected from the Open Area. As discussed in Section 3.4, a

rigorous statistical approach is used to compare the Closed Area and Open Area red drum

tissue results and to determine when the remediation goal has been met.

The OMMP also provides for collection of information to gage short-term trends in tissue

recovery and to “qualitatively” evaluate remedy effectiveness. Trends in concentrations of red

drum and juvenile blue crab are evaluated graphically. Increasing trends, based on multiple

annual events, indicate that the sediment remedies are not being effective at reducing tissue

concentrations, and would warrant consideration of additional remedial measures. Decreasing

trends, also based on multiple annual events, indicate that the sediment remedies are having

the desired effects, subject to quantitative confirmation by statistical comparison of Closed Area

and Open Area red drum tissue samples. Static or fluctuating trends indicate that multiple

parameters are affecting tissue concentrations, and further monitoring and possibly

consideration of additional remedial measures may be necessary.

000063



2.5 DREDGE ISLAND INSPECTIONS

An Engineering Evaluation/Cost Analysis (EE/CA) for a non-time critical removal action was

conducted by Alcoa for the Dredge Island in 1997 (Alcoa, 1997). A streamlined risk evaluation,

prepared as part of the EE/CA, indicated that mercury from Dredge Island could enter Lavaca

Bay via erosion of mercury-contaminated soils. Based on that finding, the EE/CA documented

the selection of a removal action that minimized the potential for the release of mercury from the

island due to either uncontrolled erosion during normal storm events or due to the effects of

more intense storms (e.g., hurricanes).

The removal action was conducted between 1998 and 2001, and is referred to as the “Dredge

Island Stabilization Project.” The project included relocating the contents of the Dredge

Materials Placement Areas (DMPAs) containing elevated levels of mercury (approximately

523,000 cubic yards) into the Gypsum Placement Areas (GPAs). In addition, the containment

dikes surrounding the GPAs were raised so that they would not be overtopped during a design

storm. This required increasing 10,700 linear feet of dike to an approximate elevation of 30 feet

msl. As part of this work, the marshes on the north end of the island were removed. Erosion

protection and runoff control structures were also installed on the island. A detailed description

of the scope of the removal action is contained in Alcoa, 1997. The final design and as-built

drawings for the Dredge Island remedy are contained in the Dredge Island Removal Action

Plan, Volume 4 - Phase 1 Dredge Island Stabilization Completion Report (Alcoa, 2002).

The performance objective for the Dredge Island remedy is to interrupt the potential direct

exposure pathway of contaminants in soils and sediments from Dredge Island as a result of a

significant storm event or uncontrolled erosion during stormwater runoff. The removal action

and reconfiguration of Dredge Island achieved this objective through engineering means, and

therefore the performance objective for this OMMP is to preserve the integrity of the

reconfigured island through periodic inspections and maintenance and/or repairs, as needed.

The inspection requirements are provided in the OMMP for Dredge Island, including the

inspection of the following primary components:

• The access bridge from mainland to northern shore of Dredge Island; • The 10,500 lineal feet of the Alcoa Confined Disposal Facility (CDF) containment dikes;

000064



• The storm protection on the Alcoa CDF dike exterior, including the armor layer, underlayer, and dike toe protection;

• The gravel erosion protection on the exterior dike slopes above the armor protections and the interior dike slopes above 26.5 ft (NGVD 1929);

• The 25-ft. long concrete emergency spillway; • The two dredge decant structures including the discharge structures; • The two waterstops installed in the Calhoun County Navigation District (CCND) CDF

dikes; and • The road on the Alcoa CDF dikes.

The access bridge was damaged during Hurricane Claudette in 2003 and subsequent Dredge

Island inspections have not included detailed inspection of the bridge. Repair of the bridge is

being evaluated at this time.

2.6 CAPA SOIL CAP INSPECTIONS

Soils contaminated with mercury greater than the applicable risk-based values were identified

during the RI at the CAPA. These soils were generally associated with the area to the west of

former Building R-300, and encompassed an area of approximately 1.8 acres. The remedial

action objective for CAPA soils was to reduce the future exposure potential of site workers to

mercury in soils at the CAPA. A clay/gravel cap was installed, which was graded for

stormwater drainage, and the stormwater management structures were modified to collect only

surface runoff. The grades were obtained by compacting a clay subgrade over the entire area,

from approximately several inches thick at the perimeter to 1.2 feet thick at the center. A six-

inch crushed limestone material was then placed over the compacted clay subgrade. To limit

usage of the area by Plant and contractor personnel, three-by-six feet warning signs were

placed on the north and west sides of the capped area. Also, a memorandum was distributed to

the entire Plant to inform workers of the upgrades made to the area, the restrictions on the

capped area, and disciplinary actions for not complying with the restrictions. Additional

information is contained in the CAPA Soils RDR/OMMP.

An inspection and maintenance program was developed for the capped area, as described in

the RDR/OMMP. This program consists of quarterly inspections, and maintenance as required.

The main components of the inspection are:

• Cap integrity (e.g., signs of vehicular traffic, burrowing, erosion, etc.); • Vegetation growth; • Signage integrity (e.g., upright and legible);

000065



• Storm drains free of debris; and • No equipment or waste storage.

All items noted on the inspections are corrected as soon as practicable.

000066



3.0 MONITORING RESULTS

3.1 CHLOR-ALKALI PROCESS AREA GROUNDWATER EXTRACTION AND TREATMENT SYSTEM

The primary monitoring results for the CAPA groundwater and extraction system are provided in

Tables 3.1-1, 3.1-2, 3.1-3 and 3.1-4. Selected potentiometric data are shown on Figures 3.1-1

and 3.1-2. Field records and logs from system operational checks and maintenance activities

are kept in project binders and maintained in the project filing system.

The system data indicates that the system is operating efficiently and as designed. Hydraulic

control is achieved and appears to effectively reduce the potential for migration of mercury-

impacted groundwater in Zone B west of former Building R-300 to Lavaca Bay, based on the

observed potentiometric surface and reductions in surface water mercury (and carbon

tetrachloride) concentrations (see Section 3.2). The concentrations of mercury and volatile

organic compounds in system effluent samples were all less than the discharge standards listed

in the RDR/OMMP. Therefore, all performance standards were met during 2005.

3.2 CHLOR-ALKALI PROCESS AREA OFFSHORE SURFACE WATER SAMPLING Surface water concentration data for mercury and carbon tetrachloride for all RI/FS and

subsequent monitoring events are shown on Tables 3.2-1 and 3.2-2. Diurnal samples results

and field data for the 2001 through 2005 events are shown on Tables 3.2-3 and 3.2-4. The

sampling locations are shown on Figure 3.2-1. Field records for the monitoring event are kept in

project binders and maintained in the project filing system.

The sampling data indicates that the performance objectives were met in 2005. All measured

mercury and carbon tetrachloride concentrations are below the surface water quality standards.

3.3 SEDIMENT MONITORING

As discussed in Section 2.3, the long-term sediment monitoring program includes open water

sediment samples and marsh sediment samples within the Closed Area. The 2005 annual

000067



sediment monitoring program is presented in Appendix A, and provides specific information

about sample collection, analytical results and data validation for the 2005 event.

The performance goal for surficial open water sediment samples is to achieve a mean

concentration of 0.5 mg/kg. As detailed in Appendix A, a total of 122 grid based surficial open

water sediment samples were collected in the Closed Area during the 2005 monitoring event.

The mercury concentration of these samples ranged from 0.0129 to 1.14 mg/kg dry weight (dw).

The 2005 mean mercury concentration was 0.276 mg/kg dw. The mean mercury concentration

of the 122 surficial open water sediment samples monitored in 2004 was 0.293 mg/kg dw

(Alcoa, 2005b). The mean mercury concentrations reported for both of these consecutive

annual monitoring events meet the open water sediment remediation goal of 0.5 mg/kg. The

2005 mean open-water mercury concentration is lower than the mean value from 2004, which is

consistent with a general trend of sediment recovery. Based on these two consecutive years’

results of the average open water concentration being substantially below the 0.5 mg/kg

remediation goal, Alcoa proposes that the open water sediment monitoring be eliminated from

future monitoring events which is consistent with the terms of the long-term sediment monitoring

OMMP and the Consent Decree. Alcoa will evaluate the need for additional sediment sampling

in select open water areas as part of their on-going effort to better understand trends in tissue

concentrations in the Closed Area of Lavaca Bay. Additional focused sampling programs will be

reviewed with the agency prior to implementation.

The 2005 marsh sediment data provided in Appendix A are summarized in Table 3.3-1, along

with the results from the 2004 sediment sampling event. The marsh sediment remediation goal

of 0.25 mg/kg is met in Marsh 11, which is located within the CCND harbor. The 2005

concentrations of mercury in the remaining marshes ranges from 0.273 to 0.587 mg/kg dw. In

general, sediment concentrations in the marshes with average mercury concentrations greater

than 0.25 mg/kg appear to be decreasing between 2004 and 2005, which is consistent with

sediment recovery. The rate of decrease in concentration is quite variable, however, ranging

from 6 to 71 percent.

The data summarized in Table 3.3-1 suggest that one marsh, Marsh 1, which is referred to as

the Southern Causeway Marsh, increased dramatically between 2004 and 2005. However,

review of individual sub-samples from Marsh 1 shown in Table 3 of Appendix A indicates that

the mathematical average concentration in Marsh 1, 0.495 mg/kg, is skewed by the SUP0007

sample, which was reported to be 1.830 mg/kg. The average for Marsh 1 excluding this outlier

000068



is 0.161 mg/kg, which would represent a decrease in concentration within the range observed in

the other marshes between 2004 and 2005. Outliers are frequently observed in environmental

data sets, and as discussed in Section 4.2, revisions to the OMMP to identify and resolve data

outliers should be considered. Additionally, the relatively large range in percent reductions in

marsh concentrations between 2004 and 2005 suggests that there may be some intra-marsh

variability in mercury concentrations that might warrant consideration and perhaps modification

to the marsh sampling approach prior to the next annual event.

3.4 FINFISH AND SHELL FISH MONITORING

3.4.1 Red Drum Monitoring

As described in Section 2.4, the evaluation of red drum mercury monitoring data includes both a

“qualitative” review of temporal trends in red drum tissue concentrations and a quantitative

statistical review of red drum concentrations from the Closed and Open Areas.

A graph of mean tissue concentrations of red drum tissue samples collected since the RI/FS is

shown in Figure 3.4-1. Over that period, the mean concentrations of mercury in red drum tissue

samples collected from the Closed Area exhibit a trend downward towards the range in

concentrations observed in data sets collected from the Open Area. There are both positive

and negative interannual variations within the long term trend. The largest interannual change

in the period of record is the decrease of 0.4 mg/kg measured between 2003 and 2004. The

2004 mean was 0.72 and the 2005 mean was 0.87, an inter-annual increase of 0.14 mg/kg. As

discussed in the OMMP, fluctuating trends in tissue concentrations are likely indicative of the

influence of multiple parameters on tissue concentrations.

The qualitative review of juvenile blue crab data is provided in Section 3.4.2.

The following statistical analyses were conducted to quantitatively evaluate the 2005 red drum

monitoring data in accordance with the methods prescribed in the OMMP. Specifically, the

OMMP specifies the following steps:

• Sample up to 30 red drum each from the Open and Closed Areas for mercury analysis. Due to logistical constraints, this target number may not be achievable; but as long as

000069



the total sample sizes from each area are reasonably close to the target, the statistical test can accommodate the variability from the ideal target sample size.

• Evaluate assumptions of normality using normal quantile plots and a Kolmogorov-Smirnov goodness of fit test. Evaluate equality of variance using Bartlett’s test o Transformations to the data should be made as appropriate. If the data are better

fitted to a log-normal distribution, a logarithmic transformation may be appropriate prior to conducting the means testing. Quantile plots and a Kolmogorov-Smirnov goodness of fit test will be used to determine whether the untransformed or transformed data are more appropriate for use in the means test.

• If data are normally distributed, conduct a parametric means test (t-test). If the data are not normally distributed, also conduct a non-parametric means test (Wilcoxon/Mann-Whitney or equivalent).

• Conduct a post-hoc power analysis using the variance, mean differences, and sample size from the data to establish the event-specific decision error rates. o If necessary, discuss deviations from the statistical test assumptions o For years that [Hg Closed] > [Hg Open], the post-hoc power analysis will not inform the

decision making. o For years when [Hg Closed] = [Hg Open], the post-hoc power analysis will provide the

probability that a false positive error might have been made. To ensure that a Type II error has not been made when the null hypothesis is not rejected, statistical test assumptions should be met and the test power should be greater than 95 percent.

A total of 66 red drum tissue samples were collected in the 2005 monitoring event, 30 from the

Closed Area and 36 from the Open Area. Details of the 2005 red drum sampling and analysis

event are provided in Appendix B. The distribution of all red drum samples was evaluated

visually and statistically to assess normality.

Figure 3.4-2a depicts histograms and normal quantile plots of the untransformed data. The

heavy solid line on the histogram depicts the predicted normal distribution, and the light solid

line depicts the predicted log-normal distribution. The predicted distributions are based on the

scale and shape of the actual data. The histogram depiction of the data shows that a log-

normal distribution is a better fit to the data. The normal quantile plot in figure 3.4-2a depicts the

data and the expected confidence intervals. Where the data points fall generally within the

expected confidence intervals, the data can be assumed to be relatively normally distributed.

Figure 3.4-2b depicts a histogram and normal quantile plot of the log-transformed data. The

heavy line on the histogram depicts the predicted normal distribution on the log-transformed

data. The light line depicts the predicted log-normal distribution of the transformed data. The

normal distribution line provides the best fit to the log-transformed data. The log-transformed

data points on the quantile plot generally fall between the confidence intervals and were

assumed to be normally distributed.

000070



In addition to the above visual analysis, a Kolmogorov-Smirnov goodness of fit test was used to

evaluate the data. The Kolmogorov-Smirnov goodness of fit test to the untransformed data

indicated that the data were not statistically different from a log-normal distribution (p=0.11).

Therefore, based on the above analyses, the data were natural log transformed for the

subsequent means test. The transformed data were normally distributed.

Using the log-transformed data, the equality of the variance of the Open and Closed areas was

assessed using a Bartlett test. The variance was determined to be equal for these two groups

(p=0.07).

Based on the determination that the log-transformed data were normally distributed and that the

variances of the Open and Closed groups were not different, a parametric means test (t-test)

was determined to be the appropriate analysis for evaluating the test hypothesis:

• Null Hypothesis: [Hg Closed] = [Hg Open] or [Hg Closed] - [Hg Open] = 0 • Alternative Hypothesis: [Hg Closed] > [Hg Open] or [Hg Closed] - [Hg Open] > 0

Table 3.4-1 presents the summary data for the 2005 annual red drum monitoring event. The t-

test results indicate that the mean of the Closed Area samples was significantly higher than the

mean of the Open Area samples (p = 0.0001 for the log transformed data).

Although the Closed and Open areas were statistically different, a post-hoc power test was

conducted to the event-specific error rates. The decisions associated with positive and negative

error rates are summarized in Table 3.4-2.

The alpha level, α, is the probability of committing a false positive error (i.e., the null hypothesis

is rejected when it is true). In this case, the incorrect decision would be, [Hg Closed] > [Hg Open].

In other words, it would be inferred that recovery had not occurred when it had. For this

approach, an alpha level of 10 percent (α=0.1) was considered to be acceptable. The

probability that the means were similar (0.0001) was over two orders of magnitude less than the

alpha level. Therefore, the chance that a false positive error was made is miniscule.

In summary, these tests indicate that the Closed Area red drum samples remain statistically

elevated compared to the Open Area red drum samples, and the remedial objective has not

been achieved.

000071



The statistical power of a test is the probability that the null hypothesis will be correctly rejected

when it is false, or alternatively the probability that the null hypothesis will not be rejected when

it is true. The post-hoc power of the t-test for the 2005 data was 0.984. Therefore, based on

the existing sampling data, there was less than 2 percent chance (α) that the null hypothesis will

be maintained when it is false. The high power of this test, using these specific monitoring data,

indicates that the sampling design is robust and does not need modification.

3.4.2 Juvenile Blue Crab Monitoring

The short-term trends in juvenile blue crab are used to qualitatively evaluate the remedy

effectiveness. Juvenile blue crab are selected for this purpose because, being a lower trophic

level organism with a much smaller foraging range than red drum, they should demonstrate a

more focused response than red drum to changes in mercury availability.

As discussed in Section 2.4, the direction of the juvenile blue crab concentration trends

(increasing versus decreasing) and the magnitude of the trend (how fast are concentrations

increasing or decreasing) were used in a preliminary assessment of remedy effectiveness. The

trend in juvenile blue crab tissue was evaluated for the annual data sets from the years 2003,

2004, and 2005. Table 3.4-3 presents the mean tissue result and number of samples (n) by

zone and sample event. As described in the OMMP, there are four zones or quadrants in the

Closed Area, centered on the Dredge Island. Figure 3.4-3 presents the mean and individual

data points for the 2003, 2004, and 2005 sampling events by individual zone as well as all

zones combined. For all zones, mean mercury concentrations in 2004 were lower than in 2003

or 2005 for the Closed Area. The pattern of mean and individual data points was evaluated

further to better understand whether this was the case across all four zones.

For the individual zones within the Closed Area, the same temporal pattern was apparent. That

is, within each zone, the mean mercury concentrations in juvenile blue crab tissue were lower in

2004 than in either 2003 or 2005, although data were not available for Zone 3 in 2005 (due to

absence of suitable habitat, as discussed in Appendix B).

In Zone 1, the overall mean mercury concentration was higher in 2005 than in either 2003 or

2004 (Figure 3.4-3). The two samples points with the highest mercury concentrations in 2005

000072



were greater than the mean values for 2003 and 2004. These points are from Station

CLO5803, adjacent to the northwest corner of the Dredge Island.

In Zone 2, the mean mercury concentration in 2005 was essentially the same as it was in 2004,

and both the 2004 and 2005 concentrations were lower than those observed in 2003. Two

sample points in the 2005 data set were higher than the mean values in 2003 and 2004. These

points are from Station CLO5802 adjacent to the Southern Causeway Marsh area and Station

LVB5504, along the east side of the Dredge Island.

In Zone 3, the mean mercury concentrations in 2003 and 2004 were essentially the same.

Juvenile blue crab could not be collected from Zone 3 in 2005. In Zone 4, the overall mean

mercury concentration was higher in 2005 than in either 2003 or 2004.

Overall, the interannual trends in juvenile blue crab samples are similar to the interannual trends

in red drum tissue samples over the 2003 to 2005 time period. Generally, the average

concentrations of both red drum and juvenile blue crab measured in the Closed Area in 2004

were lower than the average of either 2003 or 2005 samples. The fact that sediment

concentrations in critical habitat areas appear to be decreasing over at least part of this period

suggests that other, perhaps multiple, factors are influencing the trends in mercury

concentrations measured in monitored species. These other factors could include interannual

fluctuations in salinity, recruitment, etc. Freshwater inflow was greater in 2004 than in 2003 or

2005. The drought conditions of 2005 have resulted in protracted periods of increased salinity

relative to 2004 conditions.

During a year with normal levels of rainfall, the rapid decreases in salinity that typically follow a

heavy rainfall, may force crabs and fish to stray from their normal home range in search of

more favorable conditions or food. This may expose them to different habitat which could have

lower concentrations of mercury. During a year of normal rainfall the home range adjustments

experienced by crabs and fish could reduce the exposure of individuals to areas with higher

levels of mercury. The lack of freshwater inflow to the bay that occurs during a drought,

typically allows salinity levels to exceed the normal level for the bay throughout the year, and

may allow juvenile crabs that enter the marshes in early spring to stay longer in the same

habitat. Similarly, the fish that feed on juvenile crabs are not forced to migrate in search of food,

and could feed longer than they otherwise would in areas that have higher levels of mercury.

The lack of salinity change that occurs during a period of low rainfall could therefore discourage

000073



home range adjustment, increase the expose of some individuals to mercury and increase

mercury concentrations (temporarily) in all biota.

3.5 DREDGE ISLAND INSPECTIONS Dredge Island inspections were conducted periodically throughout 2005. The most recent

inspection report is provided in Appendix C. With the exception of the damage to the access

bridge and signage from Hurricane Claudette, the island is in good shape. The performance

objectives are met. Several items were noted in the inspection report that will require continued

observation, including:

• Erosion of the unvegetated areas of the exterior sideslopes; • Exposed fabric along interior dike sideslopes; and • Erosion and fines accumulation near water stop areas.

No action for these items was determined to be necessary at this time.

3.6 CAPA SOIL CAP INSPECTION

Quarterly inspections were made during 2005. The most recent inspection report is contained

in Appendix D. The most common maintenance issue is the presence of vegetation, which

must be controlled to maintain cap integrity. A soil sterilizer is used to control vegetation. No

significant maintenance issues were noted in 2005, and inspections and maintenance will

continue.

3.7 VERIFICATION OF SITE CONDITIONS AND LAND USE

Site conditions and land use within the Site remain consistent with that described in the ROD.

The Texas Department of Health order against taking of finfish and shellfish within the Closed

Area remains current. The Alcoa PCO plant continues to operate and periodic maintenance

dredging in the Alcoa and Matagorda Ship Channel continues to occur.

Permit applications have been submitted for industrial developments within the CCND harbor

and a project to widen and deepen the Matagorda Ship Channel has been proposed. The

000074



permitting process for both of these activities involves input and coordination with both the

USEPA and Alcoa to assure that the remediation objectives of the Site are met and that

construction is consistent with the sediment management framework contained in the Feasibility

Study.

000075



4.0 CONCLUSIONS

4.1 COMPARISONS TO PERFORMANCE STANDARDS

Monitoring data collected in 2005 indicate the following:

• CAPA Groundwater extraction and treatment system continues to effectively control the discharge of mercury to the Bay System from Zone B groundwater beneath the CAPA.

• The mean concentration of mercury in open-area sediment in the Closed Area measured during 2004 and 2005 are 0.293 mg/kg and 0.276 mg/kg, and meet the remediation objective of two consecutive years below 0.5 mg/kg.

• The mercury concentrations of sediment in marshes sampled in the Closed Area are generally decreasing. As of the 2005 monitoring period, one marsh in the CCND harbor has met the remediation objective of 0.25 mg/kg for marshes. The concentrations of mercury in most of the remaining marshes decreased between the 2004 and 2005 sampling events.

• Concentrations of red drum collected from the Closed Area exhibit a general downward trend since controlling CAPA groundwater discharge and stabilization of Dredge Island, and are approaching the range of concentrations observed in the Open Area. There are positive and negative interannual fluctuations in the concentrations of mercury in the red drum data sets. The 2005 red drum samples from the Closed Area remain statistically elevated relative to the samples from the Open Area.

• The trends of mercury measured in juvenile blue crab samples from the Closed Area exhibit interannual fluctuations in mercury concentrations similar to the red drum trends.

4.2 PLANS FOR SUBSEQUENT MONITORING

All monitoring activities conducted in 2005 will be continued in 2006 with the exception of long-

term open water sediment monitoring. The remediation goal for open water sediments within

the Closed Area has been met. Alcoa will evaluate the need for additional sediment sampling in

select open water areas as part of their on-going effort to better understand trends in tissue

concentrations in the Closed Area of Lavaca Bay. Additional focused sampling programs will be

reviewed with the agency prior to implementation.

In reviewing the results obtained to date, and learning from those observations, it appears that

some modifications to specific monitoring programs may be considered. Specific issues that will

be reviewed and discussed with the agency prior to 2006 monitoring events include:

000076



Marsh sediment sampling

• The 2005 event identified what appears to be an outlier subsample (SUP0007) with elevated mercury concentrations in one marsh (Marsh 1). Modifications to the monitoring program to identify and deal with statistical outliers should be considered.

• The chemical analysis of marsh sediment subsamples, followed by mathematical averaging to derive a composite marsh mercury concentration for use in attaining performance standards seems to be a more informative approach to monitoring than compositing subsamples and obtaining just a single composite mercury analysis. We recommend that the chemical analysis of individual marsh sediment subsamples be performed in future monitoring events.

Finfish and shellfish monitoring

• Poor weather and unusually low tides hampered the success of the finfish and shellfish monitoring program in 2005. We propose to complete the monitoring program sooner during the fall sampling period, when weather conditions are generally more favorable, for monitoring in future monitoring events.

• Starting the monitoring program sooner should also afford an increased success rate in capturing the target number of organisms per zone and sampling area. An earlier start date, coupled with the advance identification of alternate sampling locations due to changes in habitat, could increase the ability to capture 7 to 8 red drum and juvenile blue crab samples per quadrant in the Closed Area, and to collect red drum from 10 to 15 stations in the Open Area.

4.3 SUMMARY OF OVERALL REMEDY EFFECTIVENESS

In summary, the completed and ongoing remedial activities have resulted in significant

downward trends in red drum tissue concentrations in the Closed Area. No additional remedial

components appear to be required at this time. The placement of beneficially reused material

from harbor expansions and channel widening and deepening projects is being considered at

this time to potentially accelerate the rate of recovery.

000077



5.0 REFERENCES

Alcoa, 1997. Engineering Evaluation/Cost Analysis (EE/CA) for a Non-Time Critical Removal Action at the Dredge Island, Alcoa (Point Comfort)/Lavaca Bay Superfund Site. July.

_____, 1998. Chlor-Alkali Process Area Focused Investigation Data Report (Volume B6L),

Alcoa (Point Comfort)/Lavaca Bay Superfund Site. July.

_____, 1999a. Chlor-Alkali Process Area Groundwater Treatability Study Data Report (Volume

M3), Alcoa (Point Comfort)/Lavaca Bay Superfund Site. October.

_____, 1999b. Remedial Investigation Report, Alcoa (Point Comfort)/Lavaca Bay Superfund

Site. November.

_____, 2002. Dredge Island Removal Action Plan, Volume 4 - Phase 1 Dredge Island

Stabilization Completion Report, Alcoa (Point Comfort)/Lavaca Bay Superfund Site. August.

_____, 2005a. Remediation Action Work Plan, Alcoa (Point Comfort)/Lavaca Bay Superfund

Site. August.

_____, 2005b. Interim Data Deliverable, Alcoa (Point Comfort)/Lavaca Bay Superfund Site.

December.

United States Environmental Protection Agency, 2001. Record of Decision for the Alcoa (Point

Comfort)/Lavaca Bay Superfund Site. December.

United States et al. v. Alcoa Inc., et al., 2005. Consent Decree for CERCLA Response Actions

and Response Costs (Civil Action Number V: 04-CV-119). February.

000078

TABLES

000079

Revision D-0March 2006

TABLE 3.1-1CAPA GROUNDWATER TREATMENT SYSTEM

ANALYTICAL RESULTSTREATMENT SYSTEM EFFLUENT

CARBON TETRACHLORIDEQ2 RESULT FLAG Q RESULT FLAG Q RESULT FLAG Q RESULT FLAG Q RESULT FLAG Q RESULT FLAG

0.01 0.38 0.325 NA 0.164 NA

ST-C4 5/18/98 0.0019 < 0.001 < 0.001 < 0.001 < 0.001 < 0.0015/29/98 0.00035 < 0.001 < 0.001 < 0.002 < 0.001 < 0.0016/4/98 0.00021 < 0.001 < 0.001 < 0.002 < 0.001 < 0.001

6/10/98 0.00041 < 0.001 < 0.001 < 0.002 < 0.001 < 0.0016/18/98 0.00021 < 0.001 < 0.001 < 0.002 < 0.001 < 0.0016/24/98 0.00027 < 0.001 < 0.001 < 0.002 < 0.001 < 0.0017/1/98 0.00017 0.00041 J < 0.001 < 0.002 < 0.001 < 0.0017/8/98 0.00016 < 0.001 < 0.001 < 0.002 < 0.001 < 0.001 5.207/15/98 0.00018 < 0.001 < 0.001 < 0.002 < 0.001 < 0.001 6.007/22/98 0.00027 < 0.001 < 0.001 < 0.002 < 0.001 < 0.0017/28/98 0.00042 < 0.001 < 0.001 < 0.002 < 0.001 < 0.001 6.458/5/98 0.00047 < 0.001 < 0.001 < 0.002 < 0.001 < 0.001 6.42

8/12/98 0.00042 < 0.001 < 0.001 < 0.002 < 0.001 < 0.001 6.528/19/98 0.00075 < 0.001 < 0.001 < 0.002 < 0.001 < 0.0018/25/98 0.00052 < 0.001 < 0.001 < 0.002 < 0.001 < 0.001 6.869/2/98 -0.0007 J < 0.001 < 0.001 < 0.002 < 0.001 < 0.001 6.739/9/98 0.00027 J < 0.001 < 0.001 < 0.002 < 0.001 < 0.001 6.82

9/16/98 0.0010 < 0.001 < 0.001 < 0.002 < 0.001 < 0.0019/23/98 0.0010 < 0.001 < 0.001 < 0.002 < 0.001 < 0.001 7.1010/1/98 0.00076 < 0.001 < 0.001 < 0.002 < 0.001 < 0.00110/7/98 0.00090 < 0.001 < 0.001 < 0.002 < 0.001 < 0.001 7.1210/14/98 0.00173 < 0.001 < 0.001 < 0.002 < 0.001 < 0.001 6.4010/21/98 0.00053 < 0.001 < 0.001 < 0.002 0.0001 J < 0.001 6.2310/28/98 0.00050 < 0.001 < 0.001 < 0.002 < 0.001 < 0.001 6.3111/4/98 0.00053 < 0.001 < 0.001 < 0.002 < 0.001 < 0.001 6.41

11/11/98 0.00007 < 0.001 < 0.001 < 0.002 < 0.001 < 0.001 6.4511/18/98 0.00045 < 0.001 < 0.001 < 0.002 < 0.001 < 0.001 6.5611/24/98 0.00012 J < 0.001 < 0.001 < 0.002 < 0.001 < 0.001 6.5112/2/98 0.00034 < 0.001 < 0.001 < 0.002 < 0.001 < 0.001 6.6412/9/98 0.00038 < 0.001 < 0.001 < 0.002 < 0.001 < 0.001 6.85

12/16/98 0.00070 < 0.001 < 0.001 < 0.002 < 0.001 < 0.001 6.8912/22/98 0.0010 < 0.001 < 0.001 < 0.002 < 0.001 < 0.001 6.9212/29/98 0.0008 0.00028 J < 0.001 < 0.002 < 0.001 < 0.001 5.53

1/6/99 0.00073 < 0.001 < 0.001 < 0.002 < 0.001 < 0.001 6.031/13/99 0.00033 J < 0.001 < 0.001 0.00008 J < 0.001 < 0.001 5.741/26/99 0.00048 < 0.001 < 0.001 < 0.002 < 0.001 < 0.001 5.702/3/99 0.00058 < 0.001 < 0.001 0.001 J 0.00029 J < 0.001 7.08

2/17/99 0.00078 J < 0.001 < 0.001 0.0012 J 0.00036 J < 0.001 7.132/24/99 0.00128 < 0.001 < 0.001 0.0019 J 0.00037 J < 0.001 6.633/5/99 0.00159 < 0.001 < 0.001 0.0018 J 0.00036 J < 0.001 6.65

3/10/99 0.00116 < 0.001 < 0.001 0.0017 J < 0.001 < 0.001 6.683/17/99 0.00064 < 0.001 < 0.001 < 0.002 < 0.001 < 0.001 7.083/24/99 0.00002 J < 0.001 < 0.001 0.0016 J 0.000042 J < 0.001 7.064/1/99 0.00023 J < 0.001 0.00027 J 0.0022 0.00014 J < 0.001 6.964/6/99 0.00020 J < 0.001 < 0.001 0.0019 J < 0.001 < 0.001 6.87

4/13/99 0.00070 J < 0.001 0.00075 J 0.002 J < 0.001 < 0.001 6.984/21/99 0.00120 < 0.001 0.00104 0.0018 J < 0.001 < 0.001 6.984/28/99 0.00110 < 0.001 0.00224 < 0.002 0.00037 < 0.001 6.975/5/99 0.00066 < 0.001 0.00363 < 0.002 0.00029 < 0.001 7.00

5/12/99 0.00143 0.00065 J 0.00644 < 0.002 < 0.001 < 0.001 7.155/19/99 0.00169 0.00039 J 0.00482 0.00076 J < 0.001 < 0.001 6.825/26/99 0.00135 0.00131 0.00884 0.00051 J < 0.001 < 0.001 7.256/2/99 0.00201 0.00261 0.01224 0.00046 J < 0.001 < 0.001 6.936/9/99 0.00181 0.00915 0.01922 0.000302 J < 0.001 < 0.001 7.02

6/16/99 0.00148 0.01192 0.02667 0.00022 J < 0.001 < 0.001 6.926/23/99 0.00228 0.0214 0.03472 0.000117 J < 0.001 < 0.001 7.236/30/99 0.00076 0.01999 0.03766 < 0.002 < 0.001 < 0.001 6.68

ST-A 7/22/99 7.82 Carbon change out8/25/99 0.00086 0.004364 0.000146 J < 0.002 < 0.001 < 0.001 6.949/1/99 0.00014 J 0.00486 < 0.001 < 0.002 < 0.001 < 0.001 6.95

MERCURYSAMPLE TAP DATE COMMENTS

TREATED GROUNDWATER DISCHARGE STANDARDS (mg/L)3

TRICHLOROETHENEANALYTICAL RESULTS (mg/L)1

CHLOROFORM METHYLENE CHLORIDE TETRACHLOROETHENE pH

C:\LAVACABA\RD_RA\RA Effectiveness Report 2005\Tables 3.1-1 to 3.2-4 Data to 2005.XLS 1 of 7

000080





0.01 0.38 0.325 NA 0.164 NA





ST-A Continued 9/8/99 0.00043 J 0.003008 < 0.001 < 0.002 < 0.001 < 0.001 7.219/15/99 0.00043 J 0.002892 0.000185 < 0.002 < 0.001 < 0.001 7.069/22/99 0.00089 0.002616 0.000152 < 0.002 < 0.001 < 0.001 7.219/29/99 0.00006 J 0.003224 < 0.001 < 0.002 < 0.001 < 0.001 7.2710/6/99 0.00018 J 0.002757 0.000408 < 0.002 < 0.001 < 0.001 7.49

10/13/99 0.00021 J 0.00291 0.000788 J < 0.002 < 0.001 < 0.001 7.3610/20/99 0.00059 0.00136 0.001111 < 0.002 < 0.001 < 0.001 7.2810/27/99 0.00033 J 0.003327 0.00275 < 0.002 < 0.001 < 0.001 7.2211/3/99 0.00002 J 0.003567 0.004421 < 0.002 < 0.001 < 0.001 7.61

11/10/99 0.00118 J 0.003112 0.00622 < 0.002 < 0.001 < 0.001 7.5011/17/99 0.00089 J 0.004599 0.009552 < 0.002 < 0.001 < 0.001 7.6511/23/99 0.00062 J 0.007814 0.012587 < 0.002 < 0.001 < 0.001 7.2212/2/99 0.00072 J 0.012289 0.016635 < 0.002 < 0.001 < 0.001 7.1412/8/99 0.00072 J 0.011109 0.017479 < 0.002 < 0.001 < 0.001 7.33

12/15/99 0.00041 J 0.014068 0.013601 < 0.002 < 0.001 < 0.001 7.3712/22/99 0.00040 J 0.01353 0.013122 < 0.002 < 0.001 < 0.001 7.4012/29/99 0.00013 J 0.010233 0.016454 < 0.002 < 0.001 < 0.001 7.00

1/5/00 0.00074 J 0.021707 0.025836 < 0.002 < 0.001 < 0.001 7.411/12/00 0.00011 J 0.035346 0.036077 < 0.002 < 0.001 < 0.001 7.381/19/00 0.00061 J 0.062926 0.048082 < 0.002 < 0.001 < 0.001 7.061/26/00 0.00044 J 0.07067 0.042044 < 0.002 < 0.001 < 0.001 6.862/2/00 0.00010 J 0.115509 0.052529 < 0.002 < 0.001 < 0.001 6.822/9/00 0.00014 J 0.155503 0.059467 < 0.002 < 0.001 < 0.001 7.01

2/16/00 0.00016 J 0.177621 0.060686 < 0.002 < 0.001 < 0.001 6.802/24/00 0.00097 0.00194 < 0.001 < 0.002 < 0.001 < 0.001 7.66

ST-B 3/3/00 0.00026 J < 0.001 < 0.001 < 0.002 < 0.001 < 0.001 8.90 Carbon change out3/9/00 0.00011 J < 0.001 < 0.001 < 0.002 < 0.001 < 0.001 7.20

3/15/00 0.00034 J < 0.001 < 0.001 < 0.002 < 0.001 < 0.001 7.703/22/00 0.00002 J < 0.001 < 0.001 < 0.002 < 0.001 < 0.001 7.103/29/00 0.00030 J < 0.001 < 0.001 < 0.002 < 0.001 < 0.001 7.054/4/00 0.00030 < 0.001 < 0.001 < 0.005 < 0.001 < 0.001 6.58

4/12/00 0.00060 0.008 < 0.001 < 0.005 < 0.001 < 0.001 7.104/19/00 < 0.00020 < 0.001 < 0.001 < 0.005 0.004 < 0.001 7.064/26/00 < 0.00020 < 0.001 < 0.001 < 0.005 < 0.001 < 0.001 7.605/3/00 < 0.00020 < 0.001 < 0.001 < 0.005 < 0.001 < 0.001 6.57

5/10/00 < 0.00040 < 0.001 < 0.001 < 0.005 < 0.001 < 0.001 6.495/17/00 < 0.00040 < 0.001 < 0.001 < 0.005 < 0.001 < 0.001 6.555/24/00 0.00110 < 0.001 < 0.001 < 0.005 < 0.001 < 0.001 6.455/31/00 < 0.00020 < 0.001 0.003 < 0.005 < 0.001 < 0.001 6.806/7/00 < 0.00020 0.01 0.005 < 0.005 < 0.001 < 0.001 6.87

6/14/00 < 0.00020 < 0.001 0.011 < 0.005 < 0.001 < 0.0016/21/00 0.00030 < 0.001 0.019 < 0.005 < 0.001 < 0.0016/29/00 < 0.00020 0.01 0.022 < 0.005 < 0.001 < 0.0017/6/00 0.00020 0.013 0.029 < 0.005 < 0.001 < 0.001 6.757/12/00 < 0.00040 0.012 0.026 < 0.005 < 0.001 < 0.001 6.577/19/00 < 0.00020 0.02 0.032 < 0.005 < 0.001 < 0.001 7.057/26/00 < 0.00020 0.026 0.041 < 0.005 < 0.001 < 0.001 6.588/2/00 0.00030 0.038 0.037 < 0.005 < 0.001 < 0.001 6.358/9/00 0.00020 0.055 0.042 < 0.005 < 0.001 < 0.0018/16/00 0.00030 0.07 0.05 < 0.005 < 0.001 < 0.001 6.418/23/00 0.00030 0.076 0.051 < 0.005 < 0.001 < 0.001 6.808/29/00 0.00020 0.095 0.052 < 0.005 < 0.001 < 0.001 6.43

ST-C 9/6/00 0.00580 < 0.001 < 0.001 < 0.005 < 0.001 < 0.001 8.43 Carbon change out9/12/00 < 0.00100 < 0.001 < 0.001 < 0.005 < 0.001 < 0.001 7.919/19/00 < 0.00020 < 0.001 < 0.001 < 0.005 < 0.001 < 0.001 8.279/27/00 0.00100 < 0.001 < 0.001 < 0.005 < 0.001 < 0.001 7.1210/3/00 < 0.00020 < 0.001 < 0.001 < 0.005 < 0.001 < 0.001 6.97

10/11/00 < 0.00020 < 0.001 < 0.001 < 0.005 < 0.001 < 0.001 7.2110/18/00 0.00020 < 0.001 < 0.001 < 0.005 < 0.001 < 0.001 6.8810/25/00 0.00020 < 0.001 < 0.001 < 0.005 < 0.001 < 0.001 6.9511/1/00 0.00030 < 0.001 < 0.001 < 0.005 < 0.001 < 0.001 7.13


000081





0.01 0.38 0.325 NA 0.164 NA





ST-C Continued 11/8/00 0.00030 < 0.001 < 0.001 < 0.005 < 0.001 < 0.001 7.1811/15/00 0.00020 < 0.001 < 0.001 < 0.005 < 0.001 < 0.001 7.4011/21/00 0.00040 < 0.001 0.001 < 0.005 < 0.001 < 0.001 7.3611/28/00 0.00040 < 0.001 0.002 < 0.005 < 0.001 < 0.001 7.0112/6/00 0.00040 < 0.001 0.002 < 0.005 < 0.001 < 0.001 7.56

12/13/00 0.00030 0.001 0.002 < 0.005 < 0.001 < 0.001 6.9812/20/00 0.00040 0.002 0.003 < 0.005 < 0.001 < 0.001 7.3412/27/00 0.00030 0.003 0.004 < 0.005 < 0.001 < 0.001 7.64

1/3/01 0.00020 0.003 0.003 < 0.005 < 0.001 < 0.001 7.141/10/01 0.00040 0.007 0.005 < 0.005 < 0.001 < 0.001 7.201/17/01 0.00040 0.011 0.006 < 0.005 < 0.001 < 0.001 7.481/24/01 0.00030 0.014 0.007 < 0.005 < 0.001 < 0.001 7.271/30/01 0.00040 0.018 0.008 < 0.005 < 0.001 < 0.001 7.292/6/01 0.00030 0.021 0.009 < 0.005 < 0.001 < 0.001 7.30

2/14/01 0.00040 0.026 0.01 < 0.005 < 0.001 < 0.001 7.362/22/01 0.00030 0.032 0.011 < 0.005 < 0.001 < 0.001 7.402/28/01 0.00030 0.033 0.011 < 0.005 < 0.001 < 0.001 7.383/7/01 0.00630 0.039 0.013 < 0.005 < 0.001 < 0.001 7.48

3/15/01 0.00040 0.071 0.02 < 0.005 < 0.001 < 0.001 7.163/21/01 0.00040 0.087 0.023 < 0.005 < 0.001 < 0.001 6.893/28/01 0.00040 0.087 0.02 < 0.005 < 0.001 < 0.001 6.794/4/01 0.00050 0.12 0.025 < 0.005 < 0.001 < 0.001 6.54

4/11/01 0.00040 0.14 0.03 < 0.005 < 0.001 < 0.001 7.49ST-A 4/19/01 < 0.00020 0.001 < 0.001 < 0.005 < 0.001 < 0.001 8.98 Carbon change out

4/26/01 < 0.00020 0.0001 < 0.001 < 0.005 < 0.001 < 0.001 8.715/2/01 < 0.00020 < 0.001 < 0.001 < 0.005 < 0.001 < 0.001 6.805/9/01 0.00020 < 0.001 < 0.001 < 0.005 < 0.001 < 0.001 7.08

5/16/01 < 0.00020 < 0.001 < 0.001 < 0.005 < 0.001 < 0.001 6.955/23/01 < 0.00020 0.001 < 0.001 < 0.005 < 0.001 < 0.001 6.905/30/01 < 0.00020 0.001 < 0.001 < 0.005 < 0.001 < 0.001 6.926/7/01 < 0.00020 < 0.001 < 0.001 < 0.005 < 0.001 < 0.001 7.05

6/13/01 < 0.00020 0.001 < 0.001 < 0.005 < 0.001 < 0.001 6.856/20/01 < 0.00020 0.002 < 0.001 < 0.005 < 0.001 < 0.001 7.046/27/01 < 0.00020 0.002 < 0.001 < 0.005 < 0.001 < 0.001 6.947/3/01 < 0.00020 0.001 < 0.001 < 0.005 < 0.001 < 0.001 6.96

7/11/01 < 0.00020 0.001 < 0.001 < 0.005 < 0.001 < 0.001 6.947/17/01 < 0.00200 0.001 < 0.001 < 0.005 < 0.001 < 0.0017/25/01 < 0.00020 0.18 0.01 < 0.005 < 0.001 < 0.001 6.998/1/01 < 0.00020 0.001 < 0.001 < 0.005 < 0.001 < 0.001 7.018/9/01 < 0.00020 0.001 < 0.001 < 0.005 < 0.001 < 0.001 6.93

8/15/01 0.00020 0.001 0.002 < 0.005 < 0.001 < 0.001 6.808/21/01 < 0.00020 0.001 0.003 < 0.005 < 0.001 < 0.001 6.908/30/01 0.00030 0.001 0.004 < 0.005 < 0.001 < 0.001 6.969/5/01 0.00020 0.002 0.005 < 0.005 < 0.001 < 0.001 6.98

9/14/01 < 0.00020 0.003 0.009 < 0.005 < 0.001 < 0.0019/21/01 < 0.00020 0.005 0.012 < 0.005 < 0.001 < 0.001 6.949/24/01 0.00020 0.006 0.012 < 0.005 < 0.001 < 0.001 6.9810/1/01 < 0.00020 0.006 0.01 < 0.005 < 0.001 < 0.001 7.0110/9/01 < 0.00100 0.006 0.011 < 0.005 < 0.001 < 0.001 6.91

10/15/01 < 0.00100 0.008 0.011 < 0.005 < 0.001 < 0.001 6.9410/22/01 < 0.00020 0.009 0.013 < 0.005 < 0.001 < 0.001 7.4410/29/01 0.00050 0.014 0.013 < 0.005 < 0.001 < 0.001 7.0311/5/01 < 0.00100 0.16 0.015 < 0.005 < 0.001 < 0.001 7.07

11/12/01 < 0.00100 0.019 0.015 < 0.005 < 0.001 < 0.001 7.5111/20/01 < 0.00100 0.015 0.012 < 0.005 < 0.001 < 0.001 7.7311/28/01 0.00100 0.014 0.011 < 0.005 < 0.001 < 0.001 7.3012/4/01 < 0.00100 0.02 0.013 < 0.005 < 0.001 < 0.001 7.49

12/10/01 0.00020 0.022 0.013 < 0.005 < 0.001 < 0.001 7.4412/21/01 0.00020 0.038 0.015 < 0.005 < 0.001 < 0.001 7.2612/27/01 0.00030 0.046 0.015 < 0.005 < 0.001 < 0.001 7.21

1/2/02 < 0.00020 0.0039 0.014 < 0.005 < 0.001 < 0.001 7.20


000082





0.01 0.38 0.325 NA 0.164 NA





ST-A Continued 1/7/02 < 0.00020 0.038 0.013 < 0.005 < 0.001 < 0.001 7.201/14/02 0.00030 0.055 0.17 < 0.005 < 0.001 < 0.001 7.141/21/02 0.00020 0.066 0.017 < 0.005 < 0.001 < 0.001 7.181/29/02 0.00030 0.066 0.017 < 0.005 < 0.001 < 0.001 7.112/4/02 < 0.00020 0.066 0.016 < 0.005 < 0.001 < 0.001 7.11

2/11/02 < 0.00020 0.069 0.014 < 0.005 < 0.001 < 0.001 7.15ST-B 2/21/02 0.07500 < 0.001 < 0.001 < 0.005 < 0.001 < 0.001 8.11 Carbon change out

2/25/02 0.03100 < 0.001 < 0.001 < 0.005 < 0.001 < 0.001 7.693/4/02 < 0.00020 < 0.001 < 0.001 < 0.005 < 0.001 < 0.001 7.32

3/11/02 < 0.00020 < 0.001 < 0.001 < 0.005 < 0.001 < 0.001 7.173/18/02 < 0.00020 < 0.001 < 0.001 < 0.005 < 0.001 < 0.001 7.143/25/02 < 0.00020 < 0.001 < 0.001 < 0.005 < 0.001 < 0.001 7.074/2/02 < 0.00100 < 0.001 < 0.001 < 0.005 < 0.001 < 0.001 7.094/8/02 < 0.00100 < 0.001 < 0.001 < 0.005 < 0.001 < 0.001 7.07

4/15/02 0.02200 < 0.001 < 0.001 < 0.005 < 0.001 < 0.001 7.084/22/02 0.00100 < 0.001 < 0.001 < 0.005 < 0.001 < 0.001 7.114/30/02 < 0.00100 < 0.001 < 0.001 < 0.005 < 0.001 < 0.001 6.925/6/02 0.04800 < 0.001 < 0.001 < 0.005 < 0.001 < 0.001 6.98

5/13/02 0.14000 < 0.001 < 0.001 < 0.005 < 0.001 < 0.001 7.035/20/02 < 0.00020 < 0.001 < 0.001 < 0.005 < 0.001 < 0.001 7.105/29/02 < 0.00020 < 0.001 < 0.001 < 0.005 < 0.001 < 0.001 7.146/3/02 < 0.00020 < 0.001 < 0.001 < 0.005 < 0.001 < 0.001 7.11

6/10/02 < 0.00020 < 0.001 < 0.001 < 0.005 < 0.001 < 0.001 7.026/18/02 0.00020 < 0.001 < 0.001 < 0.005 < 0.001 < 0.001 7.106/24/02 0.00030 < 0.001 < 0.001 < 0.005 < 0.001 < 0.001 7.077/1/02 < 0.00020 < 0.001 < 0.001 < 0.005 < 0.001 < 0.001 7.057/8/02 0.00030 < 0.001 < 0.001 < 0.005 < 0.001 < 0.001 7.13

7/15/02 0.00040 < 0.001 < 0.001 < 0.005 < 0.001 < 0.001 7.027/23/02 0.00020 < 0.001 < 0.001 < 0.005 < 0.001 < 0.001 7.107/29/02 0.00050 < 0.001 < 0.001 < 0.005 < 0.001 < 0.001 7.008/5/02 0.00050 < 0.001 < 0.001 < 0.005 < 0.001 < 0.0018/12/02 < 0.00020 < 0.001 < 0.001 < 0.005 < 0.001 < 0.001 8.168/19/02 < 0.00020 < 0.001 < 0.001 < 0.005 < 0.001 < 0.001 7.108/26/02 0.00030 < 0.001 < 0.001 < 0.005 < 0.001 < 0.001 7.049/3/02 < 0.00020 < 0.001 0.001 < 0.005 < 0.001 < 0.001 7.16

9/11/02 < 0.00020 < 0.001 0.001 < 0.005 < 0.001 < 0.001 7.049/16/02 < 0.00020 < 0.001 0.002 < 0.005 < 0.001 < 0.001 7.069/23/02 < 0.00020 < 0.001 0.003 < 0.005 < 0.001 < 0.001 6.969/30/02 < 0.00020 0.002 0.005 < 0.005 < 0.001 < 0.001 6.9910/8/02 < 0.00020 0.002 0.006 < 0.005 < 0.001 < 0.001

10/15/02 < 0.00020 0.002 0.006 < 0.005 < 0.001 < 0.00110/22/02 0.00020 0.005 0.008 < 0.005 < 0.001 < 0.001 6.7710/28/02 0.00040 0.008 0.01 < 0.005 < 0.001 < 0.001 7.1311/4/02 0.00060 0.009 0.011 < 0.005 < 0.001 < 0.001 7.07

11/13/02 < 0.00020 0.013 0.011 < 0.005 < 0.001 < 0.001 6.8011/20/02 0.00030 0.017 0.011 < 0.005 < 0.001 < 0.001 6.7311/25/02 0.00020 0.018 0.013 < 0.005 < 0.001 < 0.001 6.9112/2/02 < 0.00020 0.02 0.014 < 0.005 < 0.001 < 0.001 6.9512/9/02 < 0.00020 0.027 0.014 < 0.005 < 0.001 < 0.001 7.20

ST-C 12/16/02 < 0.00020 < 0.001 < 0.001 < 0.005 < 0.001 < 0.001 7.91 Carbon change out12/23/02 < 0.00020 < 0.001 < 0.001 < 0.005 < 0.001 < 0.001 7.22

1/3/03 < 0.00020 < 0.001 < 0.001 < 0.005 < 0.001 < 0.001 7.131/6/03 < 0.00020 < 0.001 < 0.001 < 0.005 < 0.001 < 0.001 7.04

1/14/03 < 0.00020 < 0.001 < 0.001 < 0.005 < 0.001 < 0.001 7.211/22/03 < 0.00020 < 0.001 < 0.001 < 0.005 < 0.001 < 0.001 7.431/27/03 < 0.00020 < 0.001 < 0.001 < 0.005 < 0.001 < 0.001 7.152/3/03 0.00020 < 0.001 < 0.001 < 0.005 < 0.001 < 0.001 7.10

2/11/03 < 0.00020 < 0.001 < 0.001 < 0.005 < 0.001 < 0.001 7.222/18/03 0.00020 < 0.001 < 0.001 < 0.005 < 0.001 < 0.001 7.042/24/03 < 0.00020 < 0.001 < 0.001 < 0.005 < 0.001 < 0.001 7.153/3/03 < 0.00020 < 0.001 < 0.001 < 0.005 < 0.001 < 0.001 7.11


000083





0.01 0.38 0.325 NA 0.164 NA





ST-C Continued 3/10/03 < 0.00020 < 0.001 < 0.001 < 0.005 < 0.001 < 0.001 7.173/18/03 0.00030 < 0.001 < 0.001 < 0.005 < 0.001 < 0.0013/24/03 < 0.00020 < 0.001 < 0.001 < 0.005 < 0.001 < 0.001 7.204/3/03 < 0.00020 < 0.001 < 0.001 < 0.005 < 0.001 < 0.001 6.884/8/03 < 0.00020 < 0.001 < 0.001 < 0.005 < 0.001 < 0.001 7.15

4/15/03 0.00060 < 0.001 < 0.001 < 0.005 < 0.001 < 0.001 7.124/22/03 < 0.00020 < 0.001 0.001 < 0.005 < 0.001 < 0.001 6.614/29/03 < 0.00020 < 0.001 0.001 < 0.005 < 0.001 < 0.001 7.125/5/03 < 0.00020 < 0.001 0.002 < 0.005 < 0.001 < 0.001 7.01

5/13/03 < 0.00020 < 0.001 0.002 < 0.005 < 0.001 < 0.0015/19/03 < 0.00020 < 0.001 0.003 < 0.005 < 0.001 < 0.001 7.105/28/03 < 0.00020 < 0.001 0.003 < 0.005 < 0.001 < 0.001 7.246/2/03 < 0.00020 < 0.001 0.004 < 0.005 < 0.001 < 0.001 7.216/9/03 0.00060 < 0.001 0.004 < 0.005 < 0.001 < 0.001 6.97

6/17/03 0.00040 < 0.001 0.005 < 0.005 < 0.001 < 0.001 6.846/23/03 0.00030 < 0.001 0.005 < 0.005 < 0.001 < 0.001 7.066/30/03 < 0.00020 < 0.001 0.005 < 0.005 < 0.001 < 0.001 7.147/8/03 < 0.00020 < 0.001 0.005 < 0.005 < 0.001 < 0.001 7.04

7/14/03 < 0.00020 < 0.001 0.005 < 0.005 < 0.001 < 0.001 7.037/21/03 < 0.00020 < 0.001 0.006 < 0.005 < 0.001 < 0.001 7.147/28/03 < 0.00020 0.001 0.007 < 0.005 < 0.001 < 0.001 7.128/5/03 < 0.00020 0.003 0.008 < 0.005 < 0.001 < 0.001 6.99

8/11/03 < 0.00020 0.003 0.008 < 0.005 < 0.001 < 0.001 6.938/20/03 < 0.00020 0.006 0.011 < 0.005 < 0.001 < 0.001 7.108/29/03 < 0.00020 0.006 0.01 < 0.005 < 0.001 < 0.001 7.249/1/03 < 0.00020 0.006 0.01 < 0.005 < 0.001 < 0.001 8.619/8/03 < 0.00020 0.011 0.009 < 0.005 < 0.001 < 0.001 6.89

9/17/03 < 0.00020 0.011 0.009 < 0.005 < 0.001 < 0.001 6.959/22/03 < 0.00020 0.016 0.01 < 0.005 < 0.001 < 0.001 6.909/29/03 < 0.00020 0.017 0.01 < 0.005 < 0.001 < 0.001 6.8810/6/03 < 0.00020 0.025 0.013 < 0.005 < 0.001 < 0.001 6.98

10/13/03 < 0.00020 0.027 0.011 < 0.005 < 0.001 < 0.001 6.9210/20/03 < 0.00020 0.03 0.011 < 0.005 < 0.001 < 0.001 7.0010/27/03 < 0.00020 0.033 0.01 < 0.005 < 0.001 < 0.001 7.0011/3/03 < 0.00020 0.041 0.012 < 0.005 < 0.001 < 0.001 6.97

11/11/03 0.00030 0.036 0.01 < 0.005 < 0.001 < 0.001 6.6811/17/03 < 0.00020 0.046 0.011 < 0.005 < 0.001 < 0.001 6.7011/25/03 < 0.00020 0.036 0.008 < 0.005 < 0.001 < 0.001 6.95

ST-A 12/2/03 0.00140 < 0.001 < 0.001 < 0.005 < 0.001 < 0.001 7.01 Carbon change out12/8/03 0.00170 < 0.001 < 0.001 < 0.005 < 0.001 < 0.001 7.04

12/15/03 0.00140 < 0.001 < 0.001 < 0.005 < 0.001 < 0.001 6.7312/22/03 0.00200 < 0.001 < 0.001 < 0.005 < 0.001 < 0.001 6.95

1/1/04 0.00220 < 0.001 < 0.001 < 0.005 < 0.001 < 0.001 6.901/7/04 0.00150 < 0.001 < 0.001 < 0.005 < 0.001 < 0.001 6.97

1/13/04 0.00220 < 0.001 < 0.001 < 0.005 < 0.001 < 0.001 6.861/21/04 0.00180 < 0.001 < 0.001 < 0.005 < 0.001 < 0.001 6.851/27/04 0.00140 < 0.001 < 0.001 < 0.005 < 0.001 < 0.001 6.902/4/04 0.00170 < 0.001 < 0.001 < 0.005 < 0.001 < 0.001 6.88

2/10/04 0.00140 < 0.001 < 0.001 < 0.005 < 0.001 < 0.001 6.892/17/04 0.00100 < 0.001 < 0.001 < 0.005 < 0.001 < 0.001 6.872/23/04 0.00100 < 0.001 < 0.001 < 0.005 < 0.001 < 0.001 6.883/1/04 0.00080 < 0.001 < 0.001 < 0.005 < 0.001 < 0.001 6.883/8/04 0.00030 < 0.001 < 0.001 < 0.005 < 0.001 < 0.001 7.10

3/19/04 < 0.00020 0.001 < 0.001 < 0.005 < 0.001 < 0.001 6.323/22/04 < 0.00020 < 0.001 < 0.001 < 0.005 < 0.001 < 0.001 6.744/2/04 < 0.00020 < 0.001 < 0.001 < 0.005 < 0.001 < 0.001 6.874/5/04 < 0.00020 < 0.001 < 0.001 < 0.005 < 0.001 < 0.001 7.18

4/12/04 0.00060 < 0.001 < 0.001 < 0.005 < 0.001 < 0.001 7.004/20/04 < 0.00020 < 0.001 < 0.001 < 0.005 < 0.001 < 0.001 6.725/5/04 < 0.00020 < 0.001 < 0.001 < 0.005 < 0.001 < 0.001 6.68

5/10/04 0.00040 < 0.001 < 0.001 < 0.005 < 0.001 < 0.001 6.56


000084





0.01 0.38 0.325 NA 0.164 NA





ST-A Continued 5/20/04 0.00030 < 0.001 < 0.001 < 0.005 < 0.001 < 0.001 6.835/24/04 < 0.00020 < 0.001 < 0.001 < 0.005 < 0.001 < 0.001 7.156/1/04 < 0.00020 < 0.001 < 0.001 < 0.005 < 0.001 < 0.001 6.826/8/04 0.00050 < 0.001 < 0.001 < 0.005 < 0.001 < 0.001 6.80

6/14/04 0.00070 < 0.005 < 0.005 < 0.05 < 0.005 < 0.005 6.676/22/04 0.00070 < 0.001 < 0.001 < 0.005 < 0.001 < 0.001 6.876/30/04 0.00130 < 0.001 < 0.001 < 0.005 < 0.001 < 0.001 6.777/7/04 0.00140 < 0.001 < 0.001 < 0.005 < 0.001 < 0.001 6.92

7/13/04 0.00060 < 0.001 < 0.001 < 0.005 < 0.001 < 0.001 7.007/22/04 0.00100 < 0.001 < 0.001 < 0.005 < 0.001 < 0.001 6.707/27/04 0.00060 < 0.001 < 0.001 < 0.005 < 0.001 < 0.001 6.868/2/04 0.00100 < 0.005 < 0.005 < 0.05 < 0.005 < 0.005 6.89

8/10/04 0.00120 < 0.005 < 0.005 < 0.05 < 0.005 < 0.005 6.738/18/04 0.00150 < 0.005 < 0.005 < 0.05 < 0.005 < 0.005 6.688/25/04 0.00150 < 0.005 < 0.005 < 0.05 < 0.005 < 0.005 6.609/3/04 0.00120 < 0.005 < 0.005 < 0.05 < 0.005 < 0.005 6.789/8/04 0.00140 < 0.005 < 0.005 < 0.05 < 0.005 < 0.005 6.79

9/13/04 0.00040 < 0.005 < 0.005 < 0.05 < 0.005 < 0.005 6.829/20/04 0.00070 < 0.005 < 0.005 < 0.05 < 0.005 < 0.005 6.809/27/04 0.00120 < 0.001 0.002 < 0.005 < 0.001 < 0.001 6.8810/6/04 0.00170 0.001 0.002 < 0.005 < 0.001 < 0.001 6.83

10/11/04 0.00100 0.001 0.002 < 0.005 < 0.001 < 0.001 7.0210/21/04 0.00050 0.001 0.002 < 0.005 < 0.001 < 0.001 6.7910/26/04 < 0.00020 < 0.005 < 0.005 < 0.05 < 0.005 < 0.005 6.7311/1/04 0.00210 0.001 0.002 < 0.005 < 0.001 < 0.001 6.7711/8/04 0.00120 0.002 0.003 < 0.005 < 0.001 < 0.001 6.71

11/15/04 0.00160 0.003 0.004 < 0.005 < 0.001 < 0.001 6.5211/22/04 0.00160 0.004 0.003 < 0.005 < 0.001 < 0.001 7.03

ST-B 11/29/04 0.00130 < 0.001 < 0.001 < 0.005 < 0.001 < 0.001 7.35 Carbon change out12/8/04 0.00070 < 0.001 < 0.001 < 0.005 < 0.001 < 0.001 7.80

12/13/04 0.00090 < 0.001 < 0.001 < 0.005 < 0.001 < 0.001 7.1312/20/04 0.00130 < 0.001 < 0.001 < 0.005 < 0.001 < 0.001 6.9512/28/04 0.00080 < 0.001 < 0.001 < 0.005 < 0.001 < 0.001 6.87

1/3/05 0.0022 < 0.001 < 0.001 < 0.005 < 0.001 < 0.001 7.691/11/05 0.003 < 0.001 < 0.001 < 0.005 < 0.001 < 0.001 8.661/17/05 0.0003 < 0.001 < 0.001 < 0.005 < 0.001 < 0.001 6.731/25/05 0.0005 < 0.001 < 0.001 < 0.005 < 0.001 < 0.001 7.142/1/05 0.0002 < 0.001 < 0.001 < 0.005 < 0.001 < 0.001 6.602/9/05 0.0003 < 0.001 < 0.001 < 0.005 < 0.001 < 0.001 7.00

2/14/05 0.0002 < 0.005 < 0.005 < 0.005 < 0.005 < 0.005 6.942/21/05 0.0004 < 0.001 < 0.001 < 0.005 < 0.001 < 0.001 6.912/28/05 0.0002 < 0.001 < 0.001 < 0.005 < 0.001 < 0.001 6.983/7/05 0.00028 < 0.001 < 0.001 < 0.005 < 0.001 < 0.001 7.08

3/14/05 B 0.00013 < 0.001 < 0.001 < 0.005 < 0.001 < 0.001 7.053/21/05 < 0.0002 < 0.001 < 0.001 < 0.005 < 0.001 < 0.001 6.843/29/05 0.00029 < 0.001 < 0.001 < 0.005 < 0.001 < 0.001 7.154/5/05 0.00023 < 0.001 < 0.001 < 0.005 < 0.001 < 0.001 6.87

4/11/05 0.00033 < 0.001 < 0.001 < 0.005 < 0.001 < 0.001 6.844/19/05 < 0.0002 < 0.001 < 0.001 < 0.005 < 0.001 < 0.001 6.724/27/05 B 0.0002 < 0.001 < 0.001 < 0.005 < 0.001 < 0.001 7.125/2/05 B 0.0002 < 0.001 < 0.001 < 0.005 < 0.001 < 0.001 7.145/9/05 0.00051 < 0.001 < 0.001 < 0.005 < 0.001 < 0.001 6.90

5/16/05 B 0.00026 < 0.001 < 0.001 < 0.005 < 0.001 < 0.001 6.715/24/05 0.00051 < 0.001 J 0.0002 < 0.005 < 0.001 < 0.001 6.835/30/05 0.00074 < 0.001 J 0.0002 < 0.005 < 0.001 < 0.001 6.836/6/05 0.00035 < 0.001 J 0.0004 < 0.005 < 0.001 < 0.001 6.88

6/13/05 < 0.0002 B < 0.001 J 0.0004 < 0.005 < 0.001 < 0.001 7.006/23/05 < 0.0002 < 0.001 J 0.0003 < 0.005 < 0.001 < 0.001 6.406/27/05 0.0005 J 0.0002 J 0.0006 < 0.005 < 0.001 < 0.001 7.82

ST-C 7/7/05 < 0.0002 < 0.001 < 0.001 < 0.005 < 0.001 < 0.001 7.40 Carbon change out7/11/05 0.00032 < 0.001 < 0.001 < 0.005 < 0.001 < 0.001 8.07 6/29/2005


000085





0.01 0.38 0.325 NA 0.164 NA





ST-C Continued 7/18/05 < 0.0002 < 0.001 < 0.001 < 0.005 < 0.001 < 0.001 7.827/25/05 0.00037 < 0.001 < 0.001 < 0.005 < 0.001 < 0.001 6.858/2/05 < 0.0002 < 0.001 < 0.001 < 0.005 < 0.001 < 0.001 6.828/9/05 B 0.00014 < 0.001 < 0.001 < 0.005 < 0.001 < 0.001 6.36

8/15/05 < 0.0002 < 0.001 < 0.001 < 0.005 < 0.001 < 0.001 7.688/23/05 < 0.0002 < 0.001 < 0.001 < 0.005 < 0.001 < 0.001 7.898/29/05 < 0.0002 < 0.001 < 0.001 < 0.005 < 0.001 < 0.001 7.809/6/05 < 0.0002 < 0.001 < 0.001 < 0.005 < 0.001 < 0.001 6.90

9/13/05 0.00065 < 0.001 < 0.001 < 0.005 < 0.001 < 0.001 6.779/20/05 < 0.0002 < 0.001 < 0.001 < 0.005 < 0.001 < 0.001 6.599/30/05 < 0.0002 < 0.001 < 0.001 < 0.005 < 0.001 < 0.001 6.7610/4/05 < 0.0002 < 0.001 < 0.001 < 0.005 < 0.001 < 0.001 6.91

10/12/05 < 0.0002 < 0.001 < 0.001 < 0.005 < 0.001 < 0.001 6.6810/17/05 < 0.0002 < 0.001 < 0.001 < 0.005 < 0.001 < 0.001 6.7710/25/05 < 0.0002 < 0.001 < 0.001 < 0.005 < 0.001 < 0.001 6.7811/2/05 B 0.00011 < 0.001 < 0.001 < 0.005 < 0.001 < 0.001 6.7911/9/05 B 0.00018 < 0.001 < 0.001 < 0.005 < 0.001 < 0.001 6.56

11/14/05 0.0004 < 0.001 < 0.001 < 0.005 < 0.001 < 0.001 6.8210/17/05 < 0.0002 < 0.001 < 0.001 < 0.005 < 0.001 < 0.001 6.7710/25/05 < 0.0002 < 0.001 < 0.001 < 0.005 < 0.001 < 0.001 6.7811/2/05 B 0.00011 < 0.001 < 0.001 < 0.005 < 0.001 < 0.001 6.7911/9/05 B 0.00018 < 0.001 < 0.001 < 0.005 < 0.001 < 0.001 6.56

11/14/05 0.0004 < 0.001 < 0.001 < 0.005 < 0.001 < 0.001 6.8211/23/05 < 0.0002 < 0.001 < 0.001 < 0.005 < 0.001 < 0.001 6.7711/29/05 < 0.0002 < 0.001 < 0.001 < 0.005 < 0.001 < 0.001 6.6812/5/05 < 0.0001 < 0.001 < 0.001 < 0.005 < 0.001 < 0.001 6.55

12/16/05 < 0.0001 < 0.001 < 0.001 J 0.0005 < 0.001 < 0.001 6.7512/19/05 < 0.0001 < 0.001 < 0.001 J 0.0002 < 0.001 < 0.001 7.6012/28/05 < 0.0001 Y < 0.001 < 0.001 < 0.005 < 0.001 < 0.001 7.60

NOTES:1) mg/L - milligrams per liter2) Q - Laboratory qualifier < - Not detected (ND) at a value greater than the reporting limit (RL). J - Value for an organic analysis is an estimate (Severn Trent Laboratories). Flag - Laboratory flag J - Value is an estimate; result falls within the method detection limit (MDL) and the limit of quantitation (LQ) (Lancaster Laboratories). Y - Used to identify a spike or spike duplicate recovery is outside the specified quality control limits3) Treated groundwater discharge limitations recommended by the EPA in a letter dated 7/20/1998 to Mr. Ron Weddell.4) ST - Sample tap; sample tap either (A, B, or C) depends on arrangement of carbon canisters, which changes after each carbon change out.


000086

Revision D-0March 2006TABLE 3.1-2

CAPA GROUNDWATER TREATMENT SYSTEMANALYTICAL RESULTS

RECOVERY WELLS

Q2 RESULT FLAG Q RESULT FLAG Q RESULT FLAG Q RESULT FLAG Q RESULT FLAG Q RESULT FLAGCA050B 5/18/98 3.9 52 1.3 < 0.5 0.33 < 0.5

5/29/98 4.2 116 1.8 < 0.2 0.34 < 0.17/1/98 4.0 125 2.1 < 0.1 0.34 < 0.1

7/28/98 3.3 128 1.9 < 0.2 0.31 < 0.18/25/98 3.4 130 2.0 < 0.2 0.29 < 0.1

12/22/98 2.2 142 2.3 J 0.012 0.24 0.004 J4/28/99 1.8 89 1.6 < 0.2 0.19 < 0.16/30/99 1.7 50 1.4 < 0.1 0.16 < 0.05

10/20/99 1.52 44.3 0.9 < 0.1 0.099 < 0.052/2/00 1.46 77.4 0.9 < 0.05 0.11 < 0.025

9/27/00 0.44 40 1.1 < 1 < 0.2 < 0.21/10/01 1.08 74 1.1 < 2 < 0.4 < 0.45/30/01 0.94 74 1.1 < 2 < 0.5 < 0.5

10/22/01 0.78 75 0.9 < 4 < 0.8 < 0.83/25/02 0.45 14 0.5 < 0.5 < 0.1 < 0.18/12/02 0.69 53 0.7 < 2 < 0.5 < 0.51/3/03 0.7 65 0.7 < 2 < 0.5 < 0.5

5/19/03 0.87 70 0.8 < 2 < 0.4 < 0.410/6/03 0.79 64 0.8 < 2 < 0.5 < 0.52/23/04 0.41 64 0.9 < 2 < 0.5 < 0.57/13/04 0.71 68 0.8 < 2 < 0.5 < 0.5

11/29/04 0.96 78 0.8 < 2 < 0.4 < 0.45/16/05 0.813 34 0.5 < 1 J 0.11 < 0.2

CA051B 5/18/98 0.98 73 1.2 < 0.5 < 0.5 < 0.55/29/98 0.88 94 1.6 < 0.2 0.11 < 0.17/1/98 0.76 79 1.8 < 0.2 0.11 < 0.1

7/28/98 0.61 69 1.5 < 0.1 0.078 < 0.058/25/98 0.54 64 1.6 < 0.05 0.075 0.007 J

12/22/98 0.36 59 2.0 < 0.02 0.083 < 0.024/28/99 0.37 37 1.6 < 0.05 0.061 0.004 J6/30/99 0.33 29 1.6 0.005 J 0.063 0.004 J

10/20/99 0.342 37.2 1.5 < 0.02 0.072 0.006452 J2/2/00 0.312 40.5 1.4 < 0.02 0.06 0.00478 J

9/27/00 0.201 21 1.5 < 1 < 0.2 < 0.21/10/01 0.37 11 1.0 < 0.2 0.06 < 0.055/30/01 0.16 12 1.0 < 0.5 < 0.1 < 0.1

10/22/01 0.56 52 7.0 < 2 < 0.4 < 0.43/25/02 0.045 13 1.2 < 0.5 < 0.1 < 0.18/12/02 0.072 15 1.2 < 0.005 0.05 0.0051/3/03 0.067 5.6 0.9 < 0.001 0.04 < 0.002

5/19/03 0.101 17 0.9 < 0.1 0.04 < 0.0210/6/03 0.096 15 0.9 < 0.5 < 0.1 < 0.12/23/04 0.049 4.4 0.7 < 0.1 0.04 < 0.027/13/04 0.04 4.3 0.8 < 0.1 0.05 < 0.02

11/29/04 0.15 21 0.9 < 1 < 0.2 < 0.25/16/05 0.116 9.7 0.7 < 0.25 J 0.038 < 0.05

CA052B 5/18/98 5.8 49 1.8 < 0.5 1.4 < 0.55/29/98 0.30 64 2.5 < 0.2 1.8 0.092 J6/24/98 0.237/1/98 0.32 66 2.2 < 0.2 1.5 0.076 J

7/28/98 0.24 72 1.6 < 0.1 1.0 0.0518/25/98 0.27 207 1.8 < 0.2 1.2 0.062 J4/28/99 0.25 34 1.4 < 0.1 0.4 0.02 J

SAMPLE DATEANALYTICAL RESULTS (mg/L)1

MERCURY METHYLENE CHLORIDE TETRACHLOROETHENE TRICHLOROETHENECARBON TETRACHLORIDE CHLOROFORM


000087

Revision D-0March 2006TABLE 3.1-2

CAPA GROUNDWATER TREATMENT SYSTEMANALYTICAL RESULTS

RECOVERY WELLS

Q2 RESULT FLAG Q RESULT FLAG Q RESULT FLAG Q RESULT FLAG Q RESULT FLAG Q RESULT FLAGSAMPLE DATE

ANALYTICAL RESULTS (mg/L)1

MERCURY METHYLENE CHLORIDE TETRACHLOROETHENE TRICHLOROETHENECARBON TETRACHLORIDE CHLOROFORM

CA052B 6/30/99 0.09 23 0.9 < 0.04 0.4 0.016 JContinued 10/20/99 0.87 55.1 2.3 0.029 0.48 0.025 J

2/2/00 0.0472 12 0.7 0.00125 J 0.15 0.007959/27/00 0.044 25 1.1 < 1 < 0.2 < 0.21/10/01 0.06 16 0.6 < 0.5 < 0.1 < 0.15/30/01 0.031 21 0.8 < 0.5 0.1 < 0.1

10/22/01 0.036 21 0.6 < 1 < 0.2 < 0.23/25/02 0.024 22 0.6 < 1 < 0.2 < 0.28/12/02 0.025 22 0.5 < 0.5 0.1 < 0.11/3/03 0.025 16 0.6 < 0.5 0.1 < 0.1

5/19/03 0.025 17 0.5 < 0.5 0.1 < 0.110/6/03 0.023 18 0.5 < 0.5 0.1 < 0.12/23/04 0.025 18 0.5 < 0.5 0.1 < 0.17/13/04 0.018 19 0.4 < 0.5 0.2 < 0.1

11/29/04 0.02 17 0.4 < 0.5 0.1 < 0.15/16/05 0.0197 12 0.39 < 0.5 J 0.077 < 0.1

CA0U23B 5/18/98 3.9 88 2.6 < 0.5 < 0.5 < 0.55/29/98 2.5 118 3.4 0.04 J 0.64 0.026 J7/1/98 2.4 112 3.4 0.055 J 0.63 0.025 J

7/28/98 2.4 119 3.4 0.025 J 0.62 < 0.18/25/98 2.8 124 3.4 0.032 0.55 < 0.1

12/22/98 1.4 127 3.6 0.039 J 0.79 0.0444/28/99 1.2 81 2.8 < 0.2 0.60 < 0.16/30/99 1.2 54 3.0 0.043 J 0.59 0.031 J

10/20/99 0.0887 23.6 0.8 0.004479 J 0.30 0.0162/2/00 0.705 58.9 2.2 0.01564 J 0.47 0.0258

9/27/00 0.78 45 2.0 < 1 0.40 < 0.21/10/01 0.044 48 2.0 < 1 0.40 < 0.25/30/01 0.5 25 0.8 < 1 0.20 < 0.2

10/22/01 0.41 38 1.3 < 1 0.50 < 0.23/25/02 0.22 52 19.0 < 2 0.50 < 0.48/12/02 0.45 36 1.3 < 1 0.40 < 0.21/3/03 0.49 44 1.4 < 2 0.50 < 0.4

5/19/03 0.23 31 1.8 < 1 0.40 < 0.210/6/03 0.26 31 2.2 < 1 0.50 < 0.22/23/04 0.27 32 2.0 < 1 0.60 < 0.27/13/04 0.3 36 1.5 < 1 0.60 < 0.2

11/29/04 0.31 40 1.6 < 1 0.60 < 0.25/16/05 0.259 36 1.6 J 0.042 0.52 J 0.064

NOTE:1) mg/L - milligrams per liter2) Q - Laboratory qualifier < - Not detected (ND) at a value greater than the reporting limit (RL). J - Value for an organic analysis is an estimate. Flag - Laboratory flag J - Value is an estimate; result falls within the method detection limit (MDL) and the limit of quantitation (LQ) (Lancaster Laboratories).


000088



ANALYTICAL RESULTSAIR STRIPPER EFFLUENT

Q2 RESULT FLAG Q RESULT FLAG Q RESULT FLAG Q RESULT FLAG Q RESULT FLAG Q RESULT FLAGST-9 5/18/98 0.63 0.034 0.0016 0.002 < 0.001

5/29/98 1.76/10/98 1.06/24/98 0.67/1/98 0.33 0.018 0.00047 J 0.00079 J < 0.001

7/28/98 0.32 0.019 0.00017 J 0.00062 J < 0.0018/25/98 0.26 0.018 < 0.002 0.00062 J < 0.0019/23/98 0.17 0.013 < 0.002 0.001 < 0.00110/1/98 0.29 0.021 < 0.002 0.0008 J < 0.00110/7/98 0.037 0.006 < 0.002 < 0.001 < 0.001

12/16/98 0.026 0.0009 < 0.002 < 0.001 < 0.0012/17/99 0.146 0.00324 < 0.002 0.001 < 0.0013/10/99 0.050415 0.001822 < 0.002 0.00034 J < 0.0014/6/99 0.30273 0.006957 < 0.002 0.003346 < 0.0015/5/99 0.872 0.062 < 0.002 0.007 0.0004 J9/1/99 0.178 0.007 < 0.002 0.000979 J < 0.001

9/29/99 0.033 0.0009 < 0.002 0.000204 J < 0.00110/27/99 11.931 0.516 J < 0.002 0.172 J < 0.0012/24/00 0.00607 0.000256 J < 0.002 < 0.001 < 0.0018/9/00 < 0.001 < 0.001 < 0.005 < 0.001 < 0.00110/5/00 0.048 0.011 < 0.005 < 0.001 < 0.0011/10/01 0.001 < 0.001 < 0.005 < 0.001 < 0.0015/30/01 0.005 0.021 < 0.005 < 0.001 < 0.001

10/22/01 < 0.001 < 0.001 < 0.005 < 0.001 < 0.0013/25/02 < 0.001 < 0.001 < 0.005 < 0.001 < 0.0018/12/02 < 0.001 0.006 < 0.005 < 0.001 < 0.0011/3/03 0.003 < 0.001 < 0.005 < 0.001 < 0.0015/19/03 0.001 < 0.001 < 0.005 < 0.001 < 0.00110/6/03 0.001 < 0.001 < 0.005 < 0.001 < 0.00111/3/03 0.001 < 0.001 < 0.005 < 0.001 < 0.0012/23/04 0.002 < 0.001 < 0.005 < 0.001 < 0.0017/13/04 < 0.001 < 0.001 < 0.005 < 0.001 < 0.00111/29/04 0.001 < 0.001 < 0.005 < 0.001 < 0.0015/16/05 0.001 J 0.4 < 0.005 < 0.001 < 0.0016/13/05 0.106 B

NOTES:1) mg/L - milligrams per liter2) Q - Laboratory qualifier

limit of the method. It is also used when estimating the concentration of a tentatively identified compound. < - Not detected (ND) at a value greater than the reporting limit (RL). Flag - Laboratory flag

ANALYTICAL RESULTS (mg/L)1

MERCURY CARBON TETRACHLORIDE CHLOROFORM METHYLENE CHLORIDE TETRACHLOROETHENE TRICHLOROETHENESAMPLE TAP DATE

B - This flag is used to indicate that an analyte is present in the method blank as well as in the sample. It indicates that the client should consider this when evaluating the results

J - Value for an organic analysis is an estimate. Used when a compound is determined to be present based on chromatographic pattern or mass spectral data, but at a concentration less than the quanititation




RECOVERY WELL PUMPING DATA

(gal)1 (gal) (gal) (gal) (gal)1998 June 94,940 120,650 44,346 59,007 318,943

July 94,464 143,035 46,670 103,993 388,162August 82,659 123,384 0 86,436 292,479

September 52,560 168,124 27,020 13,602 261,306October 148,429 106,740 0 45,082 300,251

November 84,170 70,057 0 90,008 244,235December 134,556 143,925 0 140,915 419,396

TOTAL 691,778 875,915 118,036 539,043 2,224,7721999 January 56,244 58,568 38,400 57,835 211,047

February 43,480 41,230 14,454 66,873 166,037March 32,402 52,900 17,521 57,332 160,155April 86,908 73,850 25,635 89,265 275,658May 52,110 43,020 30,810 53,470 179,410June 51,070 50,110 32,000 52,310 185,490July 94,520 137,330 70,210 98,850 400,910

August 60,300 91,700 62,790 63,870 278,660September 54,440 84,460 55,250 61,830 255,980

October 59,750 118,130 65,400 82,860 326,140November 61,620 84,320 63,950 67,910 277,800December 33,170 41,080 38,180 37,680 150,110

TOTAL 686,014 876,698 514,600 790,085 2,867,3975,092,169

2000 January 63,290 84,390 71,800 77,950 297,430February 77,580 96,090 84,360 79,630 337,660

March 79,810 101,600 81,090 70,760 333,260April 58,820 75,800 63,660 56,470 254,750May 90,340 67,330 76,340 74,720 308,730June 94,060 111,140 73,990 83,730 362,920July 88,230 65,640 46,950 67,490 268,310



TOTAL 947,410 919,240 861,470 867,410 3,595,5308,687,699





TOTAL 909,160 656,660 909,850 820,530 3,296,20011,983,899





TOTAL 900,480 777,560 923,780 855,490 3,457,31015,441,209

CUMULATIVE TOTAL, ALL WELLS




CA0U23B TOTAL INFLUENTMONTH CA050B CA051B CA052BYEAR

C:\LAVACABA\RD_RA\RA Effectiveness Report 2005\Tables 3.1-1 to 3.2-4 Data to 2005.XLS1 of 2000090



RECOVERY WELL PUMPING DATA

(gal)1 (gal) (gal) (gal) (gal)CA0U23B TOTAL INFLUENTMONTH CA050B CA051B CA052BYEAR


March 110,080 110,650 62,330 75,600 358,660April 83,350 64,460 73,230 60 221,100May 56,140 67,810 66,560 36,000 226,510June 80,680 89,200 62,490 35,640 268,010July 91,660 93,820 96,350 39,310 321,140



TOTAL 1,093,650 863,480 985,220 514,480 3,456,83018,898,039





TOTAL 867,460 810,460 885,400 579,090 3,142,41022,040,449





TOTAL 995,450 575,080 794,220 442,070 2,806,82024,847,269

NOTE:1) gal - gallons






JUL-01 2 OCT-03 FEB-05 NOV-05UNF. 3 FILTERED UNF. FILTERED UNF. FILTERED UNF. FILTERED FILTERED FILTERED FILTERED FILTERED

Surface 0.059 4,5 0.087 0.112 0.0227 0.024 0.00469 0.00655 0.00122 0.00173 0.0018 0.00377 0.00157LVB9002 Mid-level 0.322 0.183 0.0362 0.0038 0.021 0.00253 0.00778 0.00101 0.000966 0.00139 0.00437 0.00171

Bottom 0.0419 0.0198 0.034 0.00652 0.0192 0.0023 0.0146 0.00131 0.000988 0.000946 0.00171 0.00144Surface 0.116 0.0252 0.121 0.0327 0.0255 0.00461 0.00648 0.00121 0.00141 0.00173 0.00383 0.00157

LVB9005 Mid-level 0.0334 0.0092 0.2135 0.0461 0.0194 0.00338 0.00727 0.00113 0.00126 0.00115 0.00326 0.000965Bottom 0.0263 0.186 NS 6 NS 0.0533 0.00252 0.0211 0.000951 0.00107 0.00287 0.00255 0.0012Surface NS NS 0.0505 0.00794 0.0313 0.00325 0.00865 0.00156 0.00158 0.0018 0.00326 0.00133

LVB9007 Mid-level NS NS 0.0812 0.00412 0.0251 0.0021 0.0117 0.00106 0.0012 0.00172 0.00591 0.00153Bottom NS NS 0.0875 0.0058 0.0248 0.00328 0.00736 0.00115 0.00116 0.00104 0.00219 0.0015Surface NS NS 0.169 0.0439 NS NS 0.00676 0.00173 0.00145 0.0016 0.00308 0.00134

LVB9008 Mid-level NS NS NS NS 0.0269 0.00182 0.0277 0.00121 0.00119 0.00119 0.00405 0.00137Bottom NS NS NS NS NS NS 0.0546 0.00135 0.00124 0.001 0.00244 0.00128Surface NS NS 0.0704 0.0317 0.0218 0.00209 0.00624 0.00144 0.00147 0.00233 0.00327 0.00132

LVB9009 Mid-level NS NS 0.0976 0.0267 0.0408 0.0029 0.00886 0.001 0.00104 0.00107 0.00206 0.00115Bottom NS NS 0.29 0.161 0.0273 0.00202 0.0196 0.000985 0.00108 0.000831 0.00161 0.00128Surface NS NS 0.0242 0.00613 0.0148 0.00293 0.00626 0.00117 0.00166 0.00223 0.00411 0.00151

LVB9011 Mid-level NS NS 0.039 0.00628 0.0296 0.00224 0.00451 0.000753 0.00104 0.000852 0.00199 0.00157Bottom NS NS 0.0111 0.00147 0.0264 0.0022 0.00849 0.000876 0.00115 0.000958 0.000915 0.0014Surface NS NS 0.0144 0.00497 0.0284 0.00511 NS NS 0.00202 0.0022 0.00332 0.00152

LVB9012 Mid-level NS NS 0.0167 0.00249 0.0179 0.00247 NS NS 0.00118 0.00131 0.00253 0.00137Bottom NS NS 0.0211 0.00364 0.0177 0.00203 NS NS 0.00103 0.00102 0.00141 0.00122

1) Pre- and Post-Containment refer to the initiation of hydraulic control at the CAPA, which occurred when the extraction and treatment system was started in May 1998.2) Pre-2001 data are more fully described in the RI Report and other previous documents3) UNF. - indicates a sample that was not filtered prior to analysis4) Mercury data are compared to the Texas Surface Water Quality Standard for mercury of 0.025 µg/L (human health, fish ingestion, saltwater; 30 TAC 307.6(d)(1)).

6) NS - indicates that sample site was not sampled during that event5) All samples reported in µg/L - micrograms per liter.

Notes:

JUN-98 JUN-99

MAY 1998 CONTAINMENT

LOCATION SAMPLE DEPTH

JAN-98 FEB-98PRE-CONTAINMENT 1 POST-CONTAINMENT

TABLE 3.2-1CUMULATIVE CAPA OFFSHORE SURFACE WATER SAMPLING RESULTS

MERCURY (µg/L)



RESULT MDL 3 RESULT MDL RESULT MDL RESULT MDLSurface 1.68 4,5 3.6 ND 6 ND ND 0.028 ND 0.2 ND 0.2 ND 0.21

LVB9002 Mid-level 6.35 ND ND 0.0141 J 7 ND 0.028 ND 0.2 ND 0.2 ND 0.21Bottom 1.74 0.6 ND ND ND 0.028 ND 0.2 ND 0.2 ND 0.21Surface 2.18 4.33 ND ND ND 0.028 ND 0.2 ND 0.2 ND 0.21

LVB9005 Mid-level ND 7.42 ND ND ND 0.028 ND 0.2 ND 0.2 ND 0.21Bottom ND NS 8 ND 0.0196 J ND 0.028 ND 0.2 ND 0.2 ND 0.21Surface NS 0.75 ND ND ND 0.028 ND 0.2 ND 0.2 ND 0.21

LVB9007 Mid-level NS ND ND ND ND 0.028 ND 0.2 ND 0.2 ND 0.21Bottom NS 0.43 ND ND ND 0.028 ND 0.2 ND 0.2 ND 0.21Surface NS 3.99 NS ND ND 0.028 ND 0.2 ND 0.2 ND 0.21

LVB9008 Mid-level NS NS ND ND ND 0.028 ND 0.2 ND 0.2 ND 0.21Bottom NS NS NS ND ND 0.028 ND 0.2 ND 0.2 ND 0.21Surface NS 2.73 ND ND ND 0.028 ND 0.2 ND 0.2 ND 0.21

LVB9009 Mid-level NS 0.94 ND ND ND 0.028 ND 0.2 ND 0.2 ND 0.21Bottom NS 1.41 ND ND ND 0.028 ND 0.2 ND 0.2 ND 0.21Surface NS ND ND ND ND 0.028 ND 0.2 ND 0.2 ND 0.21

LVB9011 Mid-level NS 1.14 ND ND ND 0.028 ND 0.2 ND 0.2 ND 0.21Bottom NS ND ND ND ND 0.028 ND 0.2 ND 0.2 ND 0.21Surface NS ND ND NS ND 0.028 ND 0.2 ND 0.2 ND 0.21

LVB9012 Mid-level NS ND ND NS ND 0.028 ND 0.2 ND 0.2 ND 0.21Bottom NS ND ND NS ND 0.028 ND 0.2 ND 0.2 ND 0.21

Notes:1) Pre- and Post-Containment refer to the initiation of hydraulic control at the CAPA, which occurred when the extraction and treatment system was started in May 19982) Pre-2001 data are more fully described in the RI Report and other previous documents3) MDL - method detection limit4) Carbon tetrachloride data are compared to the Texas surface water quality standard for carbon tetrachloride of 5.6 µg/L (human health, fish ingestion, saltwater)5) All samples reported in µg/L - micrograms per liter6) ND - Not detected7) J - Estimated8) NS - indicates that sample site was not sampled during that event

OCT-03 FEB-05FEB-98 JUN-98 JUN-99 JUL-01 2

MAY 1998 CONTAINMENT

PRE-CONTAINMENT 1 POST-CONTAINMENT

TABLE 3.2-2CUMULATIVE CAPA OFFSHORE SURFACE WATER SAMPLING RESULTS

CARBON TETRACHLORIDE (µg/L)

NOV-05LOCATION SAMPLE DEPTH JAN-98



RESULT MDL 2

7/24/01 1352 0.00108 ND 0.028 Rising7/24/01 2130 0.00105 ND 0.028 High7/25/01 0520 0.00121 ND 0.028 Ebbing10/23/03 1406 0.000831 ND 0.2 Rising10/23/03 2149 0.000861 ND 0.2 Ebbing10/24/03 0630 0.00614 ND 0.2 Rising10/24/03 1345 0.0015 ND 0.2 Low2/22/05 1049 0.00161 ND 0.2 Ebbing2/22/05 1850 0.0016 ND 0.2 Rising2/23/05 0255 0.00243 ND 0.2 High2/23/05 1040 0.00282 ND 0.2 Ebbing11/17/05 1215 0.00128 ND 0.21 Ebbing11/17/05 2220 0.00115 ND 0.21 Rising11/18/05 0420 0.001 ND 0.21 High11/18/05 1220 0.000829 ND 0.21 Ebbing

Notes:1) µg/L - micrograms per liter2) MDL - method detection limit

LVB9009

TABLE 3.2-3

CARBON TETRACHLORIDE

(µg/L)

FILTERED MERCURY

(µg/L) 1

TIDAL STATUS

CUMULATIVE DIURNAL SAMPLE RESULTS AT SITE LVB9009

SAMPLE LOCATION

SAMPLE DATE

SAMPLE TIME



CAPA OFFSHORE SURFACE WATER SAMPLE FIELD DATA

SAMPLE LOCATION NORTHING 1 EASTING DATE

TOTAL DEPTH

(ft) 2

WATER COLOR

SAMPLE DEPTH FROM SURFACE

(m) 3

SAMPLE TIME

TEMPERATURE (oC) 4 pH

SPECIFIC CONDUCTIVITY

(µS/cm) 5

TURBIDITY (NTU) 6

LVB9002 13428865.43 2750104.83 7/24/2001 6.0 Clear 1.0 1238 31.8 7.73 36,620 15.13.0 1252 31.1 7.71 37,880 12.85.0 1303 30.8 7.65 38,620 19.5

10/23/2003 4.5 Clear 1.0 1435 36.6 8.08 29,346 122.3 1455 26.46 8.05 31,871 19.23.5 1510 26.18 7.99 37,760 17

2/22/2005 4.6 Clear 1.0 1025 20.92 8.01 18,054 7.62.3 1037 19.55 7.88 23,322 8.93.6 1050 18.42 7.84 28,112 7.9

11/17/2005 4.3 Clear with 1.0 1445 18.23 8.09 42,157 13.3 Greenish 2.2 1438 18.3 8.03 41,948 16.9

tint 3.4 1430 18.77 7.99 41,947 19.8LVB9005 13428669.38 2750140.25 7/24/2001 4.6 Clear 1.0 1427 31.9 7.76 36,200 14

2.3 1440 30.9 7.62 37,970 14.83.6 1454 31.5 7.65 37,990 16.5

10/23/2003 4.9 Clear 1.0 1545 26.47 8.04 33,111 15.62.4 1620 26.2 7.98 34,702 15.83.8 1635 26.12 8.01 37,648 16.5

2/22/2005 4.0 Clear 1.0 1203 20.25 7.89 20,432 8.22.0 1225 19.55 7.83 23,149 8.83.0 1235 18.91 7.70 25,350 8.5


tint 3.7 1350 17.12 8.08 42,382 19.3LVB9007 13428427.04 2750222.00 7/24/2001 5.8 Clear 1.0 1211 31.7 7.93 41,260 NM 7

3.0 1238 31.0 7.84 42,540 NM4.8 1253 30.5 7.32 44,570 NM

10/23/2003 6.2 Clear 1.0 1601 NM 7.73 14,670 15.53.1 1626 NM 7.57 18,415 12.25.2 1639 NM 7.57 19,272 16

2/22/2005 5.1 Clear 1.0 1220 20.39 7.93 21,170 12.12.5 1230 19.6 8.01 22,260 11.24.1 1245 18.13 7.94 28,090 10.4


tint 4.3 1650 17.57 8.02 42,120 12.0LVB9008 13428753.79 2750129.35 7/24/2001 4.0 Clear 1.0 1334 31.5 7.74 36,060 15.3

2.0 1348 31.3 7.69 37,290 14.13.0 1358 31.0 7.69 37,640 14.5

10/23/2003 3.8 Clear 1.0 1705 26.35 8.06 32,142 14.61.9 1725 26.05 8.00 35,426 16.62.8 1740 25.6 7.98 37,666 15.6

2/22/2005 3.4 Clear 1.0 1113 21.14 8.01 18,166 9.41.7 1125 20.0 7.93 23,159 8.52.4 1140 19.16 7.83 25,358 7.8


tint 2.3 1310 18.74 7.98 42,085 14.8

2001-2005

TABLE 3.2-4


000095


CAPA OFFSHORE SURFACE WATER SAMPLE FIELD DATA

SAMPLE LOCATION NORTHING 1 EASTING DATE

TOTAL DEPTH

(ft) 2

WATER COLOR

SAMPLE DEPTH FROM SURFACE

(m) 3

SAMPLE TIME

TEMPERATURE (oC) 4 pH

SPECIFIC CONDUCTIVITY

(µS/cm) 5

TURBIDITY (NTU) 6

2001-2005

TABLE 3.2-4

LVB9009 13428737.45 2750074.85 7/24/2001 8.2 Clear 1.0 1330 31.8 7.96 41,240 NM4.0 1344 30.8 7.90 42,050 NM7.2 1352 30.4 7.64 46,180 NM

10/23/2003 9.3 Clear 1.0 1333 27.24 6.41 20,624 124.6 1350 28.23 7.50 36,495 15.48.3 1406 27.56 7.40 39,444 10.7

2/22/2005 7.9 Clear 1.0 1016 21.2 7.12 17,160 19.23.5 1036 18.3 7.95 28,540 10.76.9 1049 17.2 7.71 33,980 14.3

8.0 7.0 1850 18.16 7.84 33,278 9.98.5 7.5 0255 17.6 8.02 34,452 12.28.0 7.0 1025 20.34 7.90 32,102 7.9


tint 4.8 1220 17.76 7.62 42,079 25.45.9 4.9 2015 15.89 7.93 41,504 17.46.1 5.1 0415 14.44 8.02 42,234 34.26.1 5.1 1220 16.23 8.04 42,672 26.8

LVB9011 13428721.11 2750025.80 7/24/2001 11.3 Clear 1.0 1457 32.4 8.00 42,140 NM5.0 1507 30.9 7.79 44,710 NM

10.3 1524 30.4 7.58 47,750 NM10/23/2003 12.0 Clear 1.0 1438 27.59 7.96 28,097 13.9

6.0 1458 NM 7.59 20,645 23.111.0 1516 NM 7.45 21,600 19.8

2/22/2005 9.8 Clear 1.0 1116 21.0 7.76 20,150 12.44.9 1135 19.2 7.78 30,440 10.38.8 1150 18.15 7.87 33,860 14.5


tint 8.4 1600 18.17 7.98 42,384 21.0LVB9012 13429077.81 2750014.90 7/24/2001 6.0 Clear 1.0 1011 32.8 6.82 34,430 14.4

3.0 1156 32.1 7.50 37,070 18.45.0 1208 31.3 7.68 38,220 13.7

10/23/2003 5.4 Clear 1.0 1320 28.1 7.23 31,800 122.6 1345 27.01 7.80 36,392 114.3 1357 26.4 7.97 36,911 18.3

2/22/2005 5.6 Clear 1.0 0935 28.1 7.23 17,234 12.02.8 0950 27.01 7.80 26,574 11.04.6 1002 26.4 7.97 30,038 18.3


tint 4.5 1510 18.49 8.01 42,044 19.8

Notes:1) Coordinates presented in US State Plane 1983 Texas South Central 42042) ft - feet3) m - meters4) °C - degrees Celsius5) µS/cm - microSiemens per centimeter6) NTU - Nephelometric Turbidity Units7) NM - not measured at that location8) Monitoring station LVB9009 offset towards the eastern-northeast due to barges - 11/17/05; original station coordinates (13428737.45N ; 2750074.85E).

13428747.836 8 2750107.95


000096


MARSH ID 2004 2005 PERCENT CHANGE

Marsh 1 0.263 0.495 88%Marsh 5 0.644 0.369 -43%Marsh 7 0.625 0.347 -44%Marsh 11 0.019 0.0205 N.A.Marsh 14 0.626 0.587 -6%Marsh 15 0.943 0.273 -71%Marsh 19 0.447 0.478 7%

Notes:

2. Marsh locations shown in Figure 1, Appendix A.3. Basic data provided in Appendix A.

5. Remediation goal is 0.25 mg/kg (highlighted).6. Percent change = -[(2004 value-2005 value)/2004 value].

questionable.

Decreasing concentrations with time have a negative change.

TABLE 3.3-1 SUMMARY OF 2004 AND 2005 MARSH SEDIMENT MERCURY CONCENTRATIONS

1. Concentrations are mg/kg dw - milligrams per kilogram dry weight.

4. As discussed in Appendix A, the 2005 measurement for Marsh 1 is

C:\LAVACABA\RD_RA\RA Effectiveness Report 2005\Table3.3-1PBW.xls1 of 1000097


C:\LAVACABA\RD_RA\RA Effectiveness Report 2005\Table 3.4-1 to 3.4-3PBW.doc 1 of 1

TABLE 3.4-1 SUMMARY OF 2005 RED DRUM TISSUE MERCURY RESULTS

AREA SAMPLE SIZE MEAN Hg

(mg/kg ww)1 STANDARD ERROR

Closed 30 0.865 0.0801 Open 36 0.476 0.038

Note: 1) mg/kg ww – milligrams per kilogram wet weight

TABLE 3.4-2 SUMMARY OF TYPE I (α) AND TYPE II (β) ERRORS

OUTCOMES REJECT NULL HYPOTHESIS DO NOT REJECT NULL HYPOTHESIS

Null Hypothesis is True

α Type I error

(false positive/false rejection)

Correct Decision at appropriate power

Null Hypothesis is False Correct Decision

β Type II Error

(false negative/false acceptance)

TABLE 3.4-3 MEAN JUVENILE BLUE CRAB TISSUE MERCURY CONCENTRATIONS

SAMPLING EVENT

2003 2004 2005 ZONE MEAN Hg

(mg/kg ww)1 n2

MEAN Hg (mg/kg ww)

n MEAN Hg

(mg/kg ww) n

1 0.312 5 0.184 3 0.376 4 2 0.418 10 0.204 12 0.211 17 3 0.134 3 0.103 8 -- 0 4 0.115 12 0.063 8 0.159 6

Open Area 0.068 30 0.065 30 0.047 30 Notes: 1) mg/kg ww – milligrams per kilorgram wet weight 2) n – number of samples

000098

FIGURES

000099

000100

000101

000102

0

0.2

0.4

0.6

0.8

1

1.2

1.4

1.6

1.8

1998 2000 2002 2004 2006 2008 2010 2012 2014

Mea

n Co

ncen

tratio

n of

Mer

cury

in R

ed F

ish

Sam

ples

(mg/

Kg)

Closed AreaAdjacent Area

CAPA groundwatercontrol starts 5/98

Dredge Island StabilizationProject from 1998 to 2001

000103

0

0.5

1

1.5

2

Mer

cury

(mg/

kg w

w)

.01 .05.10 .25 .50 .75 .90.95 .99

-2 -1 0 1 2 3

Normal Quantile Plot

-2

-1.5

-1

-0.5

0

0.5

LN M

ercu

ry (m

g/kg

ww

)

.01 .05.10 .25 .50 .75 .90.95 .99

-2 -1 0 1 2 3

Normal Quantile Plot

000104

0.0

0.5

1.0

Mer

cury

(mg/

kg w

w)

2003

Ann

ual

2004

Ann

ual

2005

Ann

ual

Sample Event

0.0

0.5

1.0

Mer

cury

(mg/

kg w

w)

2003

Ann

ual

2004

Ann

ual

2005

Ann

ual

Sample Event

0.0

0.5

1.0

Mer

cury

(mg/

kg w

w)

2003

Ann

ual

2004

Ann

ual

2005

Ann

ual

Sample Event

0.0

0.5

1.0

Mer

cury

(mg/

kg w

w)

2003

Ann

ual

2004

Ann

ual

2005

Ann

ual

Sample Event

0.0

0.5

1.0

Mer

cury

(mg/

kg w

w)

2003

Ann

ual

2004

Ann

ual

2005

Ann

ual

Sample Event

000105

APPENDIX A

000106

LAVACA BAY ANNUAL SEDIMENT MONITORING REPORT

2005

Alcoa Point Comfort Lavaca Bay Superfund Site

March 2006

000107


Lavaca Bay Annual Sediment Monitoring Report 2005 i

TABLE OF CONTENTS

1.0 INTRODUCTION............................................................................................................... 1

1.1 PURPOSE AND SCOPE....................................................................................... 1

1.2 SITE DESCRIPTION............................................................................................. 1

2.0 METHODS ........................................................................................................................2

2.1 SAMPLE STATIONS............................................................................................. 2

2.2 SAMPLE COLLECTION........................................................................................ 5

3.0 ANALYTICAL RESULTS................................................................................................... 5

000108


Lavaca Bay Annual Sediment Monitoring Report 2005 ii

LIST OF TABLES

Table 1. Sample Stations Relocated During the Sampling Phase of the Study............................3

Table 2. Open Water Sediment Sample Stations, Sample IDs, Field Data, and Results.............7

Table 3. Marsh Sediment Stations, Sample IDs, Field Data, and Results..................................15

000109


Lavaca Bay Annual Sediment Monitoring Report 2005 iii

LIST OF FIGURES Figure 1. Open Water and Marsh Stations……………………………………………………………4

000110


Lavaca Bay Annual Sediment Monitoring Report 2005 1 of 15

1.0 INTRODUCTION The approved remedial action plan for the Alcoa/Lavaca Bay Superfund Site focuses on

eliminating ongoing sources of mercury to the Bay, reducing surface sediment concentrations of

mercury and poly aromatic hydrocarbons, and ultimately reducing mercury concentrations in fish

tissue. A key factor in the Lavaca Bay remedy is the reduction in sediment mercury

concentrations through targeted sediment removal efforts, capping, enhanced natural recovery,

and/or natural recovery. In accordance with the provisions of the Consent Decree (March 2005),

surface sediment within the Closed Area adjacent to the Point Comfort Facility will be sampled

and analyzed annually for total mercury to document the effectiveness of the remedial action

plan.

1.1 PURPOSE AND SCOPE

Monitoring of sediment mercury concentrations will be conducted annually adjacent to the Point

Comfort Facility until the remedial action goals for open water sediments and marsh sediments

have been achieved. In accordance with the Lavaca Bay Sediment Remediation and Long-Term

Monitoring Plan Operations, Maintenance, and Monitoring Plan (OMMP, Appendix H of the

Consent Decree), sediment samples were collected and analyzed for annual sediment

monitoring study in the fall of 2005. This document presents a summary of sampling and

analytical methods, and the results of the 2005 sediment monitoring study. A detailed

description of the methods and procedures for this study are presented in the OMMP.

1.2 SITE DESCRIPTION

The Alcoa Point Comfort Operations Plant is located in Calhoun County, Texas adjacent to

Lavaca Bay. An area in the bay adjacent to the Alcoa Plant is associated with elevated mercury

concentrations in fish tissue and is closed to the taking of finfish and shellfish for consumption

by order of the Texas Department of Health. This area is referred to as the “Closed Area”. The

Remedial Investigation identified the Closed Area as also containing elevated mercury

concentrations in open water and marsh sediment. The study area and sampling strategy for the

open water sediment samples and marsh sediment samples within the Closed Area are

documented in the OMMP.

000111



2.0 METHODS Sediment samples for the Alcoa 2005 Annual Sediment Monitoring Study were collected and

processed by Benchmark Ecological Services, Inc., and analyzed by Severn Trent Laboratory in

Houston, Texas. Samples were collected between 5 October and 10 November 2005.

Validation and evaluation of the analytical results was conducted by Environmental Chemistry

Services, Inc. in Houston, Texas.

2.1 SAMPLE STATIONS

Benchmark collected grab samples of sediment from a total of 122 open water sample stations

on 12, 13, 26, 27 October and 10 November 2005. Composites samples of 7 marsh sample

stations were collected on 3, 5, 27 October and 8 November 2005. Stations were located using

coordinates provided by Alcoa before the field study was initiated. The coordinates were

entered into a sub-meter Global Positioning System (GPS) and used to position the sample

vessel over the sample station. Stations that were located on oyster reefs or previously

dredged bottom (i.e., ship channels or port basins) were relocated to adjacent areas. Sample

stations that were used during previous sediment studies but were relocated during the 2005

Monitoring Study, were assigned a different station ID. Relocated sample stations are listed in

Table 1. Actual coordinates for final sample station locations were recorded using the sub-

meter GPS. Sample station locations are shown in Figure 1 and are listed in Table 2.

000112


Table 1 - Sample Stations Relocated During the Sampling Phase of the Study2005 Sample

Stations Previous Station ID Comments

SMP0017 STO0221 Moved station 340 ft. to the South, original station in channelSMP0041 LVB0920 Moved station to the North, original station in channelSMP0048 LVB0921 Moved station to the West, original station in channelSMP0049 LVB0927 Moved station 160 ft. to the East, original station in channelSMP0050 STO0115 Moved station 160 ft. to the Southeast, original station on oyster reefSMP0057 LVB0929 Moved station 170 ft. to the South, original station in channelSMP0062 STO0166 Moved station 115 ft. to the Southwest, original station on oyster reefSMP0118 STO0243 Moved station 395 ft. to the East, original station in channelSMP0121 STO0207 Moved station 50 ft. to the Southwest, original station on oyster reefSMP0016 Same Moved station 35 ft. to the North, original station on oyster reefSMP0036 Same Moved station 260 ft. to the Northwest, original station on oyster reefSMP0058 Same Moved station 150 ft. to the Southeast, original station on oyster reefSMP0066 Same Moved station 290 ft. to the East, original station in channelSMP0089 Same Moved station 115 ft. to the Northeast, original station in channelSMP0091 Same Moved station 30 ft. to the South, original station in channelSMP0092 Same Moved station 200 ft. to the South, original station in channelSMP0093 Same Moved station 240 ft. to the South, original station in channelSMP0116 Same Moved station 350 ft. to the East, original station on oyster reefSMP0124 Same Moved station 88 ft. to the East, original station in channelSMP0126 Same Moved station 100 ft. to the East, original station on oyster reef


��

��

�

��

� �

��

�

��

��

�

�

��

��

�

��

��

��

��

�

��

��

� ��

�

��

��

� ��

�

�

��

��

�

��

�

�

�

�

�

�

�

�

�

�

��

�

��

��

��

��

�

��

��

� � � �

��

�

��

��

�

�

�

�

�

�

�

�

�

�

� �

�

��

��

��

�

�

��

�

�

��

��

��

��

��

��

��

��

��

��

��

��

��! ��"��!#

�� " �� # ��

$%&�!��"�

��#!

��! �� #� ��#� ��#�

��"��"!��

$%&�!��#"��""��"�

��

$%&�!�!��#�� #

�� !�

��"��#��

$%&�!��

��!� ��!

��$%&�!��

��#

$%&�!�"

��

$%&�!��

��"�

��"�

�� "�

$%&�!��$%&�!��

��#��

�� "� ��

��#��"��

��# �� "�

��!

��

$%&�!�#

�� "

�� !��

��

��#

��

��

��

��"!

��

��##

��"�

��!� ��!�

��!

��!� ��!�

��

�� !

��"

��

��!!

��

�� $%&�!�

��

$%&�!��

��!��!"

$%&�!�"$%&�!��

��#��"�

��"

��!

�'"!

�'�#!

�'�"�

�' �

�'��

�'"�

�'��'��

�'��'��"�' �

�'�! �'�! �'�#�� '��

�'�#�

�'�"��'�! �'� #�'��

�'�� '�#! �'� � �'��" �'��

�'��'�!"�

�'�!"�'��'��"�'�#�

�'��'�� '�#� �'�� '�" �'��

�'��'��'��'��'� "

�'"��'��"

�'� �'��'�"!

�'�!� �'��"�'�"#

�'�"��'"��'��'��'��

�'�� '""!�'��

�'�

�'#�

�'��'#��'"�"�'��

�'� #�'��

�' � �'�"�

�'"��'�"�

�'��

�'#�

�' !

�'�"#

�'#��

�'!

�'"�

�'�#� �'�#"�'��

�'�"" �'�""�'��'��

�'�!!�'� � �'�#� �'�#� �'�!�

�'�#��'�#��'��'��

�'�!�� '��# �'�!#

�'�#�

�'��"�'"��

�'�"#

�'"�� '��

�'��'��

�'��!

�'��

�'��

�'�

�'#�

�'"��

�'#��

�'"��

�'� �!

�'�!�

�'�#� �'�"""

�'��!

�'�" �'��

�'�"�'��

�'�" �'�#"�'�#"

�'�" �'�#� �'� �

�'!!!

��'��

��

((((((

�� !�"

� ��#��$��

)�� %��& '� ��(

��

)�*��+��%��,��,-��.��

�* ��+�, ��,�,��

��,��-.��,�* ��,��

�� - �,��,��)��

/�, �$ � ��

+

�� /��

��0��1��.

000114



2.2 SAMPLE COLLECTION Sediment samples were collected using an Ekman grab sampler. On board the sample vessel,

a sub-sample (0-5cm depth) was collected from an undisturbed portion of the Ekman sample

using a modified 60 cc syringe. The lower end of the syringe barrel (needle lock) was cut off to

transform the syringe barrel into an open cylinder. The open end of the syringe barrel was

placed on the surface of the sediment, and while holding the syringe piston stationary, the barrel

was pushed 5 cm into the sample. The syringe was pulled from the sediment and the sub-

sample contained within the barrel was extruded from the syringe into a pre-cleaned sample jar

provided by the analytical laboratory. To provide a sufficient sample volume, the process was

repeated twice. Sediment in the sample jar was mixed using a clean plastic spoon. New clean

syringes and spoons were used for each sample.

Marsh sediment samples were not composited in the field, but were sent in individual sample

jars to the laboratory. This change from the 2004 sediment monitoring event was performed to

provide information on the spatial variability of mercury within a given marsh. The individual

samples from a given marsh are mathematically averaged in this report to produce the single

marsh concentration required by the OMMP.

Sample containers were labeled with the sample ID, station ID, collection date, and time; and

were put in re-sealable plastic bags, bubble wrapped, and immediately placed in an insulated

chest with ice. Samples were delivered to Severn Trent Laboratories in Houston for analysis.

Sample station coordinates, sample IDs, sample collection dates and sediment descriptions are

listed in Table 2. A Chain of Custody form was completed for all samples collected.

3.0 ANALYTICAL RESULTS

Sediment samples were analyzed for total mercury (SW-846, 3rd Edition, Method 7470A) and

percent moisture by Severn Trent Laboratories in Houston, Texas. Total mercury results were

reported in µg/kg as dry weight and were converted to mg/kg as dry weight. Benchmark

received the final data packet from the analytical laboratory the last week of December 2005

and data validation and evaluation was completed by Environmental Chemistry Services on 06

January 2006.

000115



Open water sediment station numbers, sample IDs, analytical results and percent moisture are

listed for each sample in Table 2. Marsh sediment station numbers, sample identification

numbers, field descriptions, and analytical results are listed in Table 3.

Analytical results for sediment samples were validated according to the Standard Operating

Procedure Data Validation (Appendix E) in the Quality Assurance Project Plan Alcoa (Point

Comfort)/Lavaca Bay Superfund Site (August 22, 2005). All analytical results were validated

and may be included in the data used to evaluate the effectiveness of the approved remedy and

to meet monitoring requirements specified in the Consent Decree.

000116


Table 2 - Open Water Sediment Sample Stations, Sample IDs, Field Data, and Results

Station ID Easting1 Northing1Sample ID Date Time

Water Depth (m) 2

Total Hg (mg/kg) 3

Percent Moisture PQL4 Flag5

Sediment Descriptions and Comments

0-1 cm Brown silt1-5 cm Gray sandy silt with minor shell hash0-1 cm Brown silty sand1-5 cm gray sand

LVB0904 2748653.215 13432754.101 SMP-SE-08317 10/13/2005 14:46 0.5 0.567 45.2 0.0897 0-5 cm Gray silt0-2 cm Brown silt2-5 cm Gray silt0-1 cm Brown silty sand1-5 cm Gray silty sand

LVB0909 2746305.886 13430343.200 SMP-SE-08296 10/13/2005 10:32 0.5 0.243 25.6 0.062 0-5 cm Brown silty sand0-2 cm Brown silty sand2-5 cm Gray silty sand0-3 cm Brown silty sand with shell hash

3-5 cm Gray silty sand with shell hash

LVB0916 2747984.942 13424037.709 SMP-SE-08346 10/26/2005 16:00 0.3 0.0465 28.0 0.0661 J 0-5 cm Brown silty sandOyster clusters and algal mat on surface 0-5 cm Brown silty sand with oyster shell0-1 cm Brown sandy silt1-5 cm Gray sandy silt

LVB0932 2750238.156 13420699.827 SMP-SE-08327 10/26/2005 13:26 0.5 0.0448 28.4 0.0687 J 0-5 cm Brown silty sand0-1 cm Very soft brown silt1-5 cm Very soft gray silt0-1 cm Very soft brown silt1-5 cm Very soft gray silt0-1 cm Brown silt1-5 cm Gray sand0-1 cm Brown silt1-5 cm Gray sandy silt0-1 cm Brown silt1-5 cm Gray sand

0.186 22.5 0.056910/13/2005 12:24 1.4LVB0901 2744486.775 13432745.319 SMP-SE-08310

25.2 0.0617

30.5

0.371

0.0644

2749236.911 13430035.837

2746252.910 13429017.996 9:08 0.7 0.413LVB0911

LVB0917

LVB0915

10/13/2005

SMP0007 SMP-SE-0831113432923.3942745320.289

2744485.104

10/13/2005SMP-SE-0831313432909.395

SMP-SE-08309

LVB0902

LVB0907

LVB0908

SMP0009

SMP0012

10/13/2005SMP-SE-0831513433639.5302745310.911

SMP-SE-0831913430974.0722747379.931

0.057820.20.1421.013:03

0.7461.115:0110/13/2005 0.11862.1

15:062747588.403 13430779.351 SMP-SE-08320 10/13/2005

2746962.325

10/13/2005

10.1

LVB0931 10/26/2005 13:39 1.6 0.251 62.7 0.1322748612.324 13420676.386 SMP-SE-08329

SMP-SE-08371

13432085.230

0.068SMP-SE-08357 10/27/2005 8:59 0.4 0.437

11:22

11:33 10.5 0.164

1.312:35

0.233

0.227

1.4

1.2

12:17

LVB0934

0.183LVB0933 2752675.047 13426557.189 10/27/2005

13426419.584 10/27/20052754343.431

25.2

74.0

75.5

31.1

0.164

0.06080.612

0.089848.61.140

0.063827.7

27.4

0.4

12:49

SMP-SE-08287 10/13/2005

SMP-SE-08370

14:02 0.610/12/20052746185.401 13426575.514 SMP-SE-08270

J

J0.197

0.0677





Water Depth (m) 2

Total Hg (mg/kg) 3



0-1 cm Brown sandy silt1-5 cm Gray sandy silt0-2 cm Brown sandy silt2-5 cm Gray sandy silt0-5 cm Brown sandy siltMoved station 340 ft. SouthTheoretical station located in dredge area

SMP0018 2743669.475 13431277.754 SMP-SE-08301 10/13/2005 11:16 1.6 0.238 34.3 0.0702 0-5 cm Brown sandy silt with gray streaking

SMP0020 2745319.759 13431273.799 SMP-SE-08303 10/13/2005 11:31 1.4 0.373 44.3 0.0854 0-5 cm Brown sandy silt0-0.5 cm Brown sandy silt0.5-5 cm Gray sandy silt0-1 cm Brown sandy silt1-5 cm Gray sandy silt0-0.5 cm Brown sandy silt0.5-5 cm Dark gray sandy silt0-5 cm Gray silt with shell and shell hashMoved station 260 ft. northwestTheoretical station located on oyster reef

SMP0038 2745323.619 13429634.897 SMP-SE-08295 10/13/2005 10:15 1.4 0.246 56.1 0.112 0-5 cm Brown sandy silt

SMP0040 2748623.032 13429649.468 SMP-SE-08321 10/13/2005 15:12 0.7 0.988 30.7 0.0656 0-5 cm Brown gray silty sand with some shell hash

0-2 cm Brown sandy silt2-5 cm Gray sandy silt0-2 cm Brown sandy silt2-5 cm Gray sandy silt0-1 cm Brown silt1-5 cm Brown gray sandy silt0-5 cm Brown gray silt

0.116

0.0905

1.6SMP-SE-08289 10/13/2005 9:27

10/13/2005

0.188 57.5

12:05

SMP0044

SMP0028

SMP-SE-08376

0.0798

0.107

0.14013430451.698 SMP-SE-08298

SMP-SE-0829113428808.956

SMP0014 2746134.402

SMP0031 2746778.714

SMP0017 (STO0221) 6

2748613.481

0.171

53.20.249

11:4413430765.912 SMP-SE-08305

13432095.050 SMP-SE-08307

56.0 0.107

0.10152.3

SMP0042

SMP0047 2748791.700

SMP0016 2747748.102

15:25 1.0SMP-SE-08322

10/13/2005

SMP0026

0.322 66.0

13432096.027 SMP-SE-08316 10/13/2005 14:38 1.3 0.572

0.650

SMP-SE-08375 11/10/2005 0.5

10/13/2005

1.612:55

1.6

10/13/2005 0.5

10/13/2005

0.632

8:30 2.3 0.518

1.2

13429039.8732749334.464

2744501.594

2742867.783

13428796.366

12:46 0.187

9:43

0.405

10/13/2005

11/10/2005

2749534.239

13428986.578

36.2 0.0723

36.6 0.0763

SMP-SE-08354

11:07

10:56 1.7

10/27/2005

SMP-SE-08300

SMP-SE-08373 11/10/2005 8:54 1.4

0.140

0.148

0.140

55.1 0.101

66.1

38.4

49.0

1.9

13431832.602

SMP0048 (LVB0921) 6

SMP0041 (LVB0920) 6

SMP0036 2743597.513 13429875.031

2743082.104

2744504.628

13429826.543

13430448.232

64.40.999

0-5 cm Brown silty sand with shell hash





Water Depth (m) 2

Total Hg (mg/kg) 3



0-5 cm Brown silty sand with oyster shellMoved station 160 ft. East Theoretical station located in dredge area0-0.5 cm Brown silty sand with shell hash0.5-5 cm Gray silty sand with shell hashMoved station 160 ft. southeast Theoretical station located on oyster reef0-1 cm Brown sandy silt1-5 cm Gray sandy silt0-2 cm Brown silty sand2-5 cm Gray silty sand0-2 cm Brown silty sand2-5 cm Gray silty sand

SMP0055 2748800.655 13427757.261 SMP-SE-08353 10/26/2005 16:55 NR 0.113 33.5 0.0694 0-5 cm Gray brown sandy silt with oyster shell0-5 cm Brown silty sandMoved station 170 ft. South Theoretical station located in dredge area0-1 cm Brown sandy silt1-5 cm Gray sandy silt0-1 cm Brown sandy silt1-5 cm Gray sandy silt0-1 cm Brown sandy silt1-5 cm Gray sandy silt0-1 cm Brown silty sand1-5 cm Gray silty sandMoved station 115 ft. southwest Theoretical station located on oyster reef

13428634.694 SMP-SE-08358 10/27/2005

1.7

59.7

0.231

0.221

62.2

0.9

50.5

0.118

0.110

0.0603

0.0683

SMP0059 2742858.951 13427161.214 SMP-SE-08277 10/12/2005 14:50

26.89:06

1.715:43

0.20315:28 1.3

2742464.997

1.8

SMP0054 2745914.388 13427992.213 15:25

58.8

2743679.748 13427983.871 15:40

10/12/2005SMP-SE-08286

0.212SMP-SE-08285 10/12/2005

SMP0058

29.6 0.0636

0.170

0.407

0.106

SMP-SE-08276

10/12/2005

15:03SMP-SE-08280 10/12/2005

14:57

SMP-SE-08282

13427150.152

13427104.016

2745257.827

10/12/2005

SMP0050 (STO0115) 6

SMP0051

13427943.5842742954.471

10/12/2005

2750101.791

2745318.791SMP0053

SMP0057 (LVB0929) 6

SMP0049 (LVB0927) 6

0.617

0.148

0.175

2.3

0.184

1.5

10/27/2005

13427178.0102744511.007 SMP-SE-08279

SMP-SE-08359

10/12/2005 1.814:40

9:17 1.8

1.9

13427988.545 SMP-SE-08283

13428199.451

2750161.443

33.7

0.122

0.0978

31.4

0.0686

55.0

30.6 0.0645

SMP0062 (STO0166) 6

SMP0061





Water Depth (m) 2

Total Hg (mg/kg) 3



0-2 cm Brown silty sand2-5 cm Gray silty sand0-5 cm Gray silty sand with gravel and oyster shellMoved station 290 ft. East Theoretical station located in dredge area0-1 cm Brown sandy silt1-5 cm Gray silty sand

SMP0071 2743685.410 13426333.806 SMP-SE-08273 10/12/2005 14:20 1.9 0.230 64.2 0.127 0-5 cm Brown sandy siltSMP0073 2745324.359 13426342.074 SMP-SE-08271 10/12/2005 14:08 1.5 0.0942 32.8 0.0709 0-5 cm Brown sandy silt

SMP0075 2748590.511 13426345.994 SMP-SE-08351 10/26/2005 16:40 1.1 0.129 35.5 0.0684 0-5 cm Gray sandy silt with oyster shell

SMP0079 2751888.836 13426349.803 SMP-SE-08364 10/27/2005 10:32 2.5 0.0129 32.8 0.0709 J 0-5 cm Orange gray silty clay with oyster shell0-1 cm Brown silt1-5 cm Gray silt

SMP0083 2742864.915 13425533.479 SMP-SE-08265 10/12/2005 11:45 2.1 0.175 62.0 0.123 0-5 cm Brown gray sandy siltSMP0085 2744500.020 13425523.027 SMP-SE-08267 10/12/2005 12:15 2.0 0.181 61.1 0.115 0-5 cm Brown gray sandy silt

0-1 cm Brown silty sand1-5 cm Gray silty sand

SMP0089 2749526.146 13425570.641 SMP-SE-08349 10/26/2005 16:21 2.4 0.155 30.4 0.0684 0-5 cm Gray silty sand with oyster shell

SMP0090 2750235.946 13425520.531 SMP-SE-08362 10/27/2005 10:14 0.8 0.0678 28.7 0.0619 0-5 cm Brown silty sand with shell hash

SMP0091 2751030.810 13425529.175 SMP-SE-08363 10/27/2005 10:24 2.6 0.0444 32.8 0.0666 J 0-5 cm Gray silty sand with oyster shell0-5 cm Very soft brown gray siltMoved station 200 ft. SouthTheoretical station located in dredge area0-5 cm Brown gray sandy siltMoved station 240 ft. SouthTheoretical station located in dredge area

SMP0094 2753523.343 13425641.674 SMP-SE-08368 10/27/2005 11:06 8.7 0.171 73.3 0.184 J 0-5 cm Very soft brown gray silt

13425412.485

13425326.929

13425528.028

SMP-SE-08365

0.0311

0.148

1.1 30.00.2222746152.217

0.129

0.0649SMP0087

0.154

0.0819

13427188.067

13426344.937

13426360.489

SMP0063 2745922.636

0.165

SMP0066 2750356.893

SMP0081 72.52753519.236

64.214:31

9.9

9:25

2.0

2.413427311.474 10/27/2005SMP-SE-08360

10/27/2005

10/12/2005SMP-SE-08281

2742247.353

SMP-SE-08269

SMP-SE-08369 10/27/2005

10/12/2005

10/12/2005SMP-SE-08275

2752665.183

2751896.405

0.1100.9

10:38 2.6

12:30

11:14

0.163

15:10

0.135

38.2

0.058522.3

J36.8 0.0719

0.0796

SMP0069

SMP0092

SMP0093 SMP-SE-08366 10/27/2005 10:44 2.4

62.6

J





Water Depth (m) 2

Total Hg (mg/kg) 3



SMP0095 2754220.307 13425657.607 SMP-SE-08367 10/27/2005 10:51 4.7 0.154 72.4 0.170 J 0-5 cm Gray black siltSMP0096 2743687.858 13424705.458 SMP-SE-08264 10/12/2005 11:40 2.2 0.178 68.1 0.152 J5 0-5 cm Brown gray sandy silt

0-2 cm Brown sandy silt with shell hash

2-5 cm Gray sandy silt with shell hash

SMP0099 2746143.637 13424702.390 SMP-SE-08260 10/12/2005 10:10 1.3 0.142 30.9 0.0678 0-5 cm Brown sandy silt0-2 cm Brown silty sand2-5 cm Gray silty sand

SMP0101 2748609.968 13424712.603 SMP-SE-08347 10/26/2005 16:05 1.3 0.413 57.2 0.110 0-5 cm Gray brown silt0-0.5 cm Brown silt0.5-5 cm Gray sandy silt0-3 cm Brown silty sand3-5 cm Gray silty sand

SMP0108 2746959.810 13423891.417 SMP-SE-08258 10/12/2005 9:58 0.9 0.233 30.2 0.0632 0-5 cm Brown sandy siltSMP0111 2749422.148 13423881.114 SMP-SE-08344 10/26/2005 15:47 2.4 0.214 63.1 0.129 0-5 cm Gray silt

0-1 cm Brown sand1-5 cm Gray sand0-3 cm Brown silty sand with shell hash3-5 cm Gray black silty sand with shell hash

SMP0116 2748135.881 13423071.776 SMP-SE-08340 10/26/2005 15:03 0.9 0.0932 24.8 0.0623 0-5 cm Gray silty sand with oyster shell

SMP0117 2748608.452 13423068.513 SMP-SE-08341 10/26/2005 15:23 1.5 0.376 56.5 0.115 0-5 cm Gray siltSMP0119 2750086.898 13423060.048 SMP-SE-08343 10/26/2005 15:38 0.3 0.161 54.3 0.108 0-5 cm Light gray silt

0-2 cm Brown silt2-5 cm Gray silty sand0-3 cm Brown silty sand with shell hash3-5 cm Gray black silty sand with shell hashMoved station 50 ft. southwest Theoretical station located on oyster reef

SMP0122 2747782.913 13422238.575 SMP-SE-08339 10/26/2005 14:56 1.2 0.205 39.8 0.0755 0-5 cm Gray silt

13423062.030

SMP0120 2746138.630 13422243.051 SMP-SE-08250 10/12/2005 8:46

1.5 0.121 28.9

SMP0115

SMP0121 (STO0207) 6

2746812.855 13422356.676

2746959.724 J

2745319.693SMP0113 SMP-SE-0825413423075.428 1.89:2810/12/2005 0.31829.60.887

0.195 69.2

SMP0100

SMP0107

SMP0105

10/12/2005

2744509.021 13423890.236 SMP-SE-08255 10/12/2005

SMP-SE-08257

2746640.692

0.098

0.0624

0.069629.3

0.06721.1 0.0581

0.0630

1.5 0.202 32.7

21.7

SMP-SE-08251 10/12/2005

13424705.167

SMP-SE-08252

2746142.843 13423882.805

SMP0098

0.150

0.0551

SMP-SE-08259

SMP-SE-082612745321.611 13424703.895 10/12/2005 1.7

1.2

9:55

9:13

11:30

8:54

10/12/2005 10:03

10/12/2005

9:35 2.2

0.7 0.0638

0.0607

24.9

0.0686

26.2





Water Depth (m) 2

Total Hg (mg/kg) 3



SMP0124 2749511.522 13422262.799 SMP-SE-08337 10/26/2005 14:42 2.5 0.363 67.8 0.155 0-5 cm Gray silt0-1 cm Brown sandy silt1-5 cm Gray sandy siltMoved station 100 ft. East Theoretical station located on oyster reef0-1 cm Brown sandy silt1-5 cm Gray sandy silt0-3 cm Gray silt3-5 cm Gray sand0-1 cm Brown silt1-5 cm Gray silt

SMP0133 2749408.656 13420608.766 SMP-SE-08328 10/26/2005 13:35 2.0 0.244 60.3 0.116 0-5 cm Brown sandy silt0-3 cm Brown sandy silt3-5 cm Light gray silt

SMP0137 2750243.002 13419776.831 SMP-SE-08326 10/26/2005 13:20 0.7 0.122 48.2 0.0878 0-5 cm Gray sandy silt0-2 cm Brown sandy silt2-5 cm Gray sandy silt0-1 cm Brown sandy silt1-5 cm Gray sandy silt0-0.5 cm Brown sandy silt0.5-5 cm Gray sandy silt0-2 cm Brown sandy silt with minor shell hash2-5 cm Gray sandy silt with minor shell hash0-1 cm Brown sandy silt1-5 cm Gray sandy silt

STO0134 2743666.690 13425603.567 SMP-SE-08266 10/12/2005 12:05 2.1 0.169 65.8 0.135 0-5 cm Brown gray sandy siltSTO0145 2744502.108 13424785.454 SMP-SE-08263 10/12/2005 11:35 2.1 0.186 64.7 0.133 J4 0-5 cm Brown gray sandy siltSTO0147 2744502.754 13426424.511 SMP-SE-08272 10/12/2005 14:15 1.8 0.194 58.0 0.110 0-5 cm Brown sandy silt

0-2 cm Brown sandy silt2-5 cm Gray sandy silt

STO0151 2744496.550 13429708.145 SMP-SE-08294 10/13/2005 10:07 1.6 0.234 62.0 0.127 0-5 cm Brown silty sand with shell hash

STO0117

STO0132

2742853.124

2747062.975

2747778.437

2742857.241 2.0 0.11810/12/2005

13429700.622

13426405.791

STO0128

STO0113

0.263

13430508.212

SMP-SE-08292

SMP-SE-08274

0.121

54.70.233

SMP0126

STO0130

SMP0135

SMP0131

J40.141

SMP-SE-08335

13421404.946

10/26/2005 0.132164.90.300SMP-SE-0833013420600.916

13419773.6272748602.226

2743663.150 13428881.002

2743675.063 13427240.666

2743681.835

9:48 1.8

0.17414:24

11:00

1.8 0.263

60.5

1.7

SMP0130 2750100.071 13421427.417

SMP0128 2748603.377 13421421.574 SMP-SE-08333 10/26/2005

10/26/2005

51.3 0.09630.197

0.097

65.00.263

0.199 45.1

40.9

62.0

1.513:08

14:30 0.7

SMP-SE-08299 10/13/2005

10/13/2005

14:53SMP-SE-08278

13:55

SMP-SE-08290 10/13/2005

SMP-SE-08331 10/26/2005

10/26/2005SMP-SE-08324

10/12/2005

9:34

14:15

1.4

0.1071.7

1.6

0.0793

1.4 0.0816

STO0149 2744477.488 13428054.799 SMP-SE-08284 10/12/2005 15:34 1.6 0.211

13:46

0.171 47.8 0.0858

47.9 0.0914

61.4 0.121





Water Depth (m) 2

Total Hg (mg/kg) 3



STO0153 2744515.732 13431330.678 SMP-SE-08302 10/13/2005 11:24 1.6 0.449 51.8 0.100 0-5 cm Gray sandy silt0-0.5 cm Brown silt0.5-5 cm Brown silty sand

STO0162 2745323.289 13430536.400 SMP-SE-08297 10/13/2005 10:49 1.5 0.450 47.9 0.0847 J4 0-5 cm Gray sandy silt0-2 cm Brown sandy silt2-5 cm Gray sandy silt

STO0168 2745306.744 13425598.843 SMP-SE-08268 10/12/2005 12:23 1.5 0.134 31.7 0.0697 0-5 cm Brown gray sandy silt with shell hash

STO0170 2745316.117 13423961.891 SMP-SE-08256 10/12/2005 9:49 1.8 0.0988 48.7 0.0886 0-5 cm Brown sandy silt0-2 cm Brown sand2-5 cm Gray silty sand0-2 cm Brown silt2-5 cm Gray silty sand

STO0191 2746117.082 13431339.248 SMP-SE-08304 10/13/2005 11:36 1.3 0.285 40.6 0.0802 0-5 cm Brown gray mottled sandy silt with minor shell hash0-1 cm Brown silt1-5 cm Gray silt0-2 cm Brown silt2-5 cm Gray sandy silt

STO0203 2746956.525 13432164.547 SMP-SE-08306 10/13/2005 11:56 1.0 0.522 59.3 0.121 0-5 cm Brown sandy silt Scattered oysters0-1 cm Brown sandy silt1-5 cm Gray sandy silt

STO0218 2747779.318 13431333.738 SMP-SE-08318 10/13/2005 14:54 1.0 0.589 62.4 0.123 0-5 cm Gray silt with minor shell hash

0-1 cm Brown silt1-5 cm Gray silt with some shell

STO0226 2748589.208 13427230.981 SMP-SE-08352 10/26/2005 16:47 0.5 0.135 42.7 0.0873 0-5 cm Brown gray silt with oyster shell

STO0228 2748615.035 13425601.173 SMP-SE-08350 10/26/2005 16:32 1.0 0.251 46.7 0.0853 0-5 cm Gray brown siltSTO0230 2748587.757 13423957.273 SMP-SE-08345 10/26/2005 15:53 1.4 0.417 53.8 0.0955 0-5 cm Gray brown sandy siltSTO0232 2748601.976 13422324.871 SMP-SE-08338 10/26/2005 14:50 1.5 0.251 55.8 0.103 0-5 cm Gray silt

0-3 cm Brown sandy silt3-5 cm Light gray silt

STO0241 2749415.573 13421503.964 SMP-SE-08334 10/26/2005 14:20 2.3 0.260 64.5 0.139 0-5 cm Gray silt

13423146.572 SMP-SE-08253 10/12/2005 9:20STO0183 2746125.902

STO0164

2746134.412

STO0160 2745312.447

10/13/2005 12:54 0.9 0.413STO0201 2746943.112

STO0193

0.118

0.0749

0.264 65.2 0.137SMP-SE-08325 10/26/2005 13:10 1.8

STO0215

STO0240 2749403.410 13419859.676

13433794.850 SMP-SE-08314

13432164.153

13428867.1992745323.458

10/26/2005SMP-SE-0833213421518.0482747779.694 1.314:09

34.3

59.60.283

0.7 0.367 26.7

1.3 0.114

0.414

STO0223 2748589.926 13430532.234 SMP-SE-08355 10/27/2005 8:40 2.4 0.608

STO0189 2746131.136 13429713.255 SMP-SE-08374 11/10/2005 9:08

1.2 0.815

0.0828

48.8 0.0902

26.0

0.0682

0.0693

56.3

13432984.399 SMP-SE-08312 10/13/2005 12:44

45.11.4SMP-SE-08308 10/13/2005 12:12

SMP-SE-08288 33.40.2241.49:2010/13/2005

0.0665

0.114





Water Depth (m) 2

Total Hg (mg/kg) 3



0-5 cm Very soft gray siltMoved station 395 ft. EastTheoretical station located in dredge area

STO0245 2749407.784 13424781.343 SMP-SE-08348 10/26/2005 16:12 2.1 0.208 46.0 0.0911 0-5 cm Gray sandy siltSTO0247 2749396.516 13426440.999 SMP-SE-08361 10/27/2005 9:53 10.8 0.197 73.8 0.176 0-5 cm Very soft brown siltSTO0261 2750225.496 13422319.344 SMP-SE-08336 10/26/2005 14:35 0.8 0.262 59.8 0.117 0-5 cm Gray sandy silt

1Coordinates in NAD 83 State Plane, Texas South Central, Survey Feet2 Water depths are not calibrated to tidal levels. 3 Analytical results presented as dry weight.4PQL = Practical Quantitation Limit = Sample Specific Method Detection Limit x 3

6 Sample stations were moved and given a new Station ID. Original sample station in parenthesis.Notes:Method Detection Limists are derived by the laboratory annually for each instrument.

NR - Not Recorded

13423115.594STO0243 2749806.834

5 "J" Flags are assigned to results < PQL, "J4" Flag assigned where field duplicate RPD > 20%, and "J5" assigned where matrix spike recovery > 125 % (one instance, MSR = 126%).

Sample Specific Method Detection Limits have as their basis the highest of the instrument-specific limits derived for each method but also incorporate each sample's matrix moisture content, extraction weight and any pertinent dilution factors.

SMP-SE-08342 10/26/2005 15:30 2.5 0.196 65.2 0.137



Table 3 - Marsh Sediment Stations, Sample IDs, Field Data, and Results

Marsh ID Station ID Easting1 Northing1Sample ID Date Time

Water Depth (m)2

Total Hg (mg/kg)3


Habitat

SUP0001 2746486.623 13434319.872 SUP-SE-08091 10/5/2005 14:19 0.5 0.140 27.9 0.066 Marsh

SUP0004 2747008.673 13434278.992 SUP-SE-08094 10/5/2005 14:46 NR 0.122 27.6 0.0637 Marsh

SUP0007 2747442.333 13433964.700 SUP-SE-08097 10/5/2005 15:06 0.4 1.830 25.2 0.590 Marsh


SUP0100 2747368.276 13434085.476 SUP-SE-08107 11/8/2005 15:50 0.3 0.272 26.8 0.0683 Marsh

0.495

SUP0018 2749258.134 13430945.234 SUP-SE-08084 10/5/2005 12:57 1.0 0.495 42.6 0.078 Marsh

SUP0022 2749538.179 13430447.821 SUP-SE-08082 10/5/2005 12:37 0.3 0.388 45.0 0.0880 Marsh

SUP0023 2749149.964 13430346.876 SUP-SE-08080 10/5/2005 12:18 0.4 0.252 34.0 0.0745 Marsh

SUP0025 2749212.767 13430088.395 SUP-SE-08079 10/5/2005 12:14 0.5 0.383 34.0 0.0758 Marsh

SUP0131 2749353.819 13429920.673 SUP-SE-08150 11/10/2005 12:43 0.1 0.326 30.1 0.0681 Marsh

0.369

SUP0026 2749672.113 13429839.913 SUP-SE-08078 10/5/2005 11:59 0.1 0.340 29.3 0.0674 Marsh

SUP0027 2749798.084 13429784.565 SUP-SE-08075 10/5/2005 11:52 0.3 0.231 27.5 0.0647 Marsh

SUP0030 2749887.010 13429543.387 SUP-SE-08074 10/5/2005 11:42 0.4 0.471 29.8 0.0701 Marsh

0.347

Marsh-11-1 2752458.714 13425365.712 SMP-SE-08372 10/27/2005 11:46 0.3 N/A6 N/A6 N/A6 Marsh





0.0205 27.2 0.0654 J Marsh

SUP0041 2748408.101 13429930.600 SUP-SE-08062 10/5/2005 10:09 0.8 0.378 29.4 0.0634 Marsh

SUP0042 2748244.816 13430059.598 SUP-SE-08058 10/5/2005 9:30 0.5 0.229 32.2 0.0651 Marsh

SUP0045 2748139.591 13430165.850 SUP-SE-08059 10/5/2005 9:16 0.4 0.212 31.0 0.0649 Marsh

0.273

SUP0049 2747958.440 13430474.472 SUP-SE-08055 10/3/2005 14:32 0.2 0.413 26.8 0.0631 Marsh

SUP0050 2747895.799 13430549.664 SUP-SE-08056 10/3/2005 14:46 0.2 1.080 45.8 0.0839 Marsh


0.587

SUP0133 2746375.711 13430382.792 SUP-SE-08116 11/8/2005 16:55 0.2 0.362 28.1 0.0652 Marsh

SUP0066 2746423.777 13430594.446 SUP-SE-08034 10/3/2005 10:48 0.3 1.210 35.1 0.077 Marsh

SUP0068 2746318.486 13430096.050 SUP-SE-08031 10/3/2005 10:25 0.5 0.128 29.3 0.0624 Marsh

SUP0070 2746322.063 13429761.568 SUP-SE-08029 10/3/2005 9:58 0.5 0.210 27.4 0.0608 Marsh

0.4781 Coordinates in NAD 83 State Plane, Texas South Central, Survey Feet2 Water depths are not calibrated to tidal level.3 Analytical results presented in dry weight.4PQL = Practical Quantitation Limit = Sample Specific Method Detection Limit x 3.

6 Sub-samples were homogenized, and a single composite analysis of the marsh is provided.Notes:Method Detection Limists are derived by the laboratory annually for each instrument.

NR - Not Recorded

Total Hg Average

Total Hg Average

Total Hg Average

Total Hg Average

Marsh 1

Marsh 5

Marsh 7

Marsh 15

Sample Specific Method Detection Limits have as their basis the highest of the instrument-specific limits derived for each method but also incorporate each sample's matrix moisture content, extraction weight and any pertinent dilution factors.

5 "J" Flags are assigned to results < PQL.

Marsh 19

Marsh 11

Total Hg Average

Total Hg Average

Marsh 14

Total Hg Result


000125

APPENDIX B

000126

LAVACA BAY FINFISH AND SHELLFISH MONITORING REPORT

2005

Alcoa Point Comfort Lavaca Bay Superfund Site

March 2006

000127


Lavaca Bay Finfish and Shellfish Monitoring Report 2005 i

TABLE OF CONTENTS

1.0 INTRODUCTION............................................................................................................... 1

1.1 Purpose and Scope............................................................................................... 1

1.2 Site Description ..................................................................................................... 1

2.0 METHODS ........................................................................................................................2

2.1 Sample Stations .................................................................................................... 2

2.2 Sample Collection ................................................................................................. 8

2.2.1 Red Drum .................................................................................................. 8

2.2.2 Juvenile Blue Crab..................................................................................... 8

2.3 Sample Processing ............................................................................................... 9

2.3.1 Red Drum .................................................................................................. 9

2.3.2 Juvenile Blue Crab..................................................................................... 9

3.0 ANALYTICAL RESULTS................................................................................................. 10

000128


Lavaca Bay Finfish and Shellfish Monitoring Report 2005 ii

LIST OF FIGURES

Figure 1. Closed Area Red Drum Sample Stations and Analytical Results………….…..….….…4

Figure 2. Adjacent Area Red Drum Sample Stations and Analytical Results……………….....…5

Figure 3. Closed Area Juvenile Blue Crab Sample Stations and Analytical Results……….....….6

Figure 4. Adjacent Area Juvenile Blue Crab Sample Stations and Analytical Results…………...7

000129


Lavaca Bay Finfish and Shellfish Monitoring Report 2005 iii

LIST OF TABLES

Table 1. Closed Area Red Drum Sample Stations, Sample IDs, Processing Data,

and Analytical Results……………………………..…..…………………………………….11

Table 2. Adjacent Area Red Drum Sample Stations, Sample IDs, Processing Data,


Table 3. Closed Area Juvenile Blue Crab Sample Stations, Sample IDs, Processing Data,


Table 4. Adjacent Area Juvenile Blue Crab Sample Stations, Sample IDs, Processing Data,


000130


Lavaca Bay Finfish and Shellfish Monitoring Report 2005 1 of 19

1.0 INTRODUCTION A key factor in the success of the Lavaca Bay Remedy is the reduction in tissue mercury

concentrations through targeted source control efforts, sediment removal efforts, capping,

enhanced natural recovery, and/or natural recovery. The Consent Decree (March 2005) for the

Lavaca Bay Superfund Site requires annual monitoring of finfish and shellfish for total mercury.

1.1 PURPOSE AND SCOPE

The objective of the program is to monitor the recovery of mercury levels in finfish and shellfish.

The monitoring data collected under this program are used to assess the effectiveness of

remedial actions implemented at the Site. This document presents a summary of sampling and

analytical methods, and the results of the 2005 monitoring study. A detailed description of the

methods and procedures for this study are presented in the Lavaca Bay Finfish and Shellfish

Operations, Maintenance, and Monitoring Plan (OMMP, Appendix I of the Consent Decree,

March 2005).

1.2 SITE DESCRIPTION

The Alcoa Point Comfort Operations Plant is located in Calhoun County, Texas adjacent to

Lavaca Bay. An area in the bay adjacent to the Alcoa Plant is associated with elevated mercury

concentrations in fish tissue and is closed to the taking of finfish and blue crabs for consumption

by order of the Texas Department of Health. This area is referred to as the “Closed Area” and is

delineated in the figures contained in this report. The monitoring area specified in the OMMP

includes both the Closed Area and designated areas outside the Closed Area (termed the

“Adjacent Areas” or the “Open Area”).

000131



2.0 METHODS Red drum and juvenile blue crab tissue samples for the 2005 Finfish and Blue Crab Monitoring

Study were collected and processed by Benchmark Ecological Services, Inc., and analyzed by

Battelle Marine Sciences Laboratory (Battelle) in Sequim, Washington. Samples were collected

between 2 October 2005 and 27 February 2006. Due to poor weather conditions and persistent

low tides the sampling period for juvenile blue crabs was extended through February. Validation

and evaluation of the analytical results was conducted by Environmental Chemistry Services,

Inc. in Houston, Texas.

2.1 SAMPLE STATIONS

A total of 30 red drum samples were collected from 12 stations inside the Closed Area (Figure

1), and 36 samples were collected from 5 stations outside the Closed Area (Adjacent

Areas)(Figure 2). A total of 27 juvenile blue crab composite samples were collected from 8

stations inside the Closed Area (Figure 3), and 30 composite samples were collected from 9

stations outside the Closed Area (Adjacent Areas) (Figure 4).

As described in the OMMP (p. 3-3), the objectives for selecting sample stations is to achieve

equal geographic representation of the four quadrants (or zones) within the Closed Area. As

also stated in the OMMP (p. 3-3), netting success will be variable and stations from which

samples are collected and the number of samples per station will vary. The actual number of

samples collected for red drum and juvenile blue crab in the 2005 monitoring event are

tabulated for each of the four zones in the Closed Area in Figures 1 and 3, respectively. The

distribution of red drum samples ranged from 6 samples in Zone 3 to 9 samples in Zone 1, and

is considered to be a very good geographic representation of the four zones.

The distribution of juvenile blue crab samples ranged from zero in Zone 3 to 17 in Zone 2. Two

factors caused this uneven distribution of samples. First, shoreline habitats have changed in

the Closed Area since implementation of the Remedial Investigation. For example, there are

currently few shoreline habitats suitable for juvenile blue crabs along the southwestern shore of

Dredge Island (Zone 3) due to removals conducted during the Dredge Island Stabilization

Project. Second, unusually protracted low tidal conditions reduced the quantity of shoreline

habitat suitable for crab collection in areas that had been previously sampled.

000132



Corrective measures can be implemented in future annual monitoring events to reduce the

potential effect of seasonal low tides and/or inclement weather on sample distribution (e.g.,

conduct juvenile blue crab sampling at the beginning of the fall monitoring period). Additional

and replacement sampling locations should be identified prior to future monitoring events to

reflect changes in suitable shoreline habitat. Regardless of such corrective measures, however,

there will always be a need for the provision in the OMMP (p. 3-3) to add additional stations

depending on netting and trapping success at each station.

The objectives for selecting Open Area sample station locations are similar to the selection

objectives for Closed Area sample stations in that the intent is to provide a geographically

uniform distribution of samples (OMMP, p. 3-3). Although the general goal is to collect samples

from 10 to 15 stations evenly distributed in the Open Area, the OMMP recognizes the variability

introduced by netting and trapping success. As with the 2005 Closed Area sampling selection,

poor weather and low tidal conditions precluded the evenly distributed collection of red drum

samples from the Open Area during the 2005 monitoring event (Figure 2). The distribution of

sampled juvenile blue crab locations in the Open Area was more evenly distributed than the

sampled red drum locations. These results were obtained even after selecting new sample

locations (two new stations for red drum and three new stations for juvenile blue crab). As

described above for the Closed Area, corrective measures to improve the distribution of Open

Area sample selection should include pre-monitoring identification of additional sampling

stations and attempting to sample earlier in the fall be the onset of conditions adverse to

sampling success.

Coordinates for all new stations were obtained using a differential GPS and recorded on sample

data sheets.

000133

��

�

��

��

� �� !"��

��#� �$��%&�'��!

�� (

��)

*��

�

�

�

�

�

�

�

� �

�

�

�

��

��

��

��

��

��

��

��

��

��

��

�"!(

�"'��"�(��"%% �"'�

�"'�%�"'+

�"(!�"%+��"('��"��"�'

�"� �"�!��"++

�"��+�"+��

�"+�!�"+��"'+ �"%%+�"%'� �"+%�

�"�(+�" ��

�" !�"(%�

�"!�'

�"'!�

�"+ !

��

� ��,��

�*�)�

��

��

��

��,�

-��.��/��/��$��0��1�2

��

��

3��4��

�"��

��'�� $��$��$�#��

��1+��1��1� �1 ��5��5�� !"��

3��'�(

-�� 3��

+%!�

)##��-� ��%6�� 3��

000134

�

�

�

�

�

��

��

��

��

��

��

��

��

��

��

��

��

��

��

��

��

��

��

��

��

��!�� "��# �$��%��$��&��'��

"�& ��&

(

��

#��)*� �+��,�� !��(��) �%��&��%

$��%��$��-#

.��/�0��0��+�1 �2�3

��

$��%��$��&�

4��5� �� &��&��

��

�� &+��$+��&+*�� $� �'

�)2��2��2� �2 �%6��&6��%

.��( �7� ��$��&$��%��)��**�8��)��9��

000135

�

�

�

�

�

�

�

��

��

��

��

��

��

��

��

��

��

��

��

��

��

��

��

��

��

��

��

��

��

��

��

�� ! �� "�� #�$�%&� �$'�'��

��('��) ��'��

*

�� '

��+ �'�*�% ,�� &�-��&�

��' ,��.��/��0��

$�%&� �$'�'��

1�'��2��3 '�3 ��/'�4��5�6

��

$�%&� �$'�'��

7�� "��

��

��-��/��$/ ��-��/�.��'��$'��(

7��

1�� $�%&� �� 7��

��

�..��1�� '��8�$�%&� �� 7��

%,5��5��5��5� &9-��9��&�000136

�

��

��

��

��

�

�

�

�

�

�

�

�

�

��

��

!"!#�$!"%%�!"!#&�!"!&�!

!"!''!��

��

��

��

��

��

��

��

��

��

��

!"!#'(!"!###!"!'%�!"!�(%!"!#�!

��)��

��!"!$&�!"!%&&

!"!%$!"!%'

!"!*(*!"!#%&!"!&*�!"!$#&!"!$'%!"!&!(

!"!�(%!"!$!%

!"!*�#!"!%�(!"!%�%

!"!*(�!"!�#�!"!$$#!"!$%%!"!$$(

$!!! ! $!!! ��

��+��)��!$%&!#"��

,��+-��.%�/*!!#

!"!!!��0��

� ��

!!!!

1��2�3��3��.�4��5�6

��7,

��*!!&��)��.��.��)��.-��

�+5('!!$5!$%5��5��8)��8!$%&!#"��

1��)��+(�--�9��+%!:%&

000137



2.2 SAMPLE COLLECTION

2.2.1 Red Drum Red drum were collected from the Closed Area and adjacent zones in the Open Area between

14 November 2005 and 11 January 2006. In the Closed Area, 30 red drum tissue samples were

collected from the 12 sample stations shown on Figure 1. In the adjacent zones, 36 red drum

tissue samples were collected from the 5 sample stations shown on Figure 2. Sampling was

conducted from a 20-foot aluminum boat. A Differential Global Positioning System was used to

locate and record the positions of all sample stations.

Red drum specimens were collected using gill nets (6 x 150 ft) with 5 inch stretch mesh. Multiple

nets (1-3) were set at each sample station in the evening, and the nets were allowed to fish over

night. The nets were retrieved the following morning and the fish were removed. Gill nets were

set at stations shown in Figure 1, and three stations (CLO5804, CLO5817, and CLO5816)

where no usable red drum were collected. Red drum with total lengths between 508 and 710

mm (20 to 28 inches) were removed from the gill nets, placed in plastic bags, and labeled with

station identification (ID), date, and time. Labeled bags were immediately placed in an insulated

box with ice for storage. Undersized and oversized red drum, and specimens of other species

were returned to the water.

The following information (at a minimum) was recorded on data sheets:

Station ID Set date List of photo log entries

Gear type Set time

Water depth End date

Initials of Field personnel End time

2.2.2 Juvenile Blue Crab Juvenile blue crabs were collected from the Closed Area and adjacent zones in the Open Area

between 2 October 2005 and 27 February 2006. In the Closed Area, 27 blue crab tissue

samples were collected from 8 sample stations (Figure 3). In the adjacent zones, 31 blue crab

tissue samples were collected from 9 sample stations (Figure 4). Sampling was conducted from

a 20-foot aluminum boat. A Differential Global Positioning System was used to locate and

record the positions of all sample stations.

000138



Juvenile blue crabs were collected using barrel type minnow traps baited with commercial crab

bait (Gulf menhaden). Traps were checked every 24 to 72 hours. Crabs were removed from

the traps, inspected, and sorted by size in a clean sorting tray. Injured, dead, undersized, and

oversized crabs were returned to the water. Crabs that were between 25-75 mm in width were

retained. Width is the distance between the tips of the primary lateral spines. Crabs collected

in the field were placed in Ziploc bags labeled with station ID, date, and collection time. Labeled

bags were immediately placed in an insulated chest with ice. Data sheets were used to record

the same sample site information listed above for finfish samples.

2.3 SAMPLE PROCESSING

2.3.1 Red Drum Red drum samples were processed within 24 hours of collection in the Alcoa Clean Lab (located

at the Alcoa Point Comfort Facility), and remained on ice until processing was complete. Fish

were weighed, measured, scaled, and rinsed with deionized (DI) water. Data were recorded on

tissue processing data sheets and are listed in Table 1 (Closed Area specimens) and Table 2

(Open Area specimens). After scaling, fish were placed in clean plastic bags and returned to

cold storage until all samples were scaled.

In the clean lab, the fish were again rinsed with DI water and placed on pre-cleaned Teflon

cutting boards. The right fillet (with skin) was removed with pre-cleaned hexane rinsed stainless

steel filet knives. The fillets were cut into small cubes, mixed, and weighed (in grams). A 50-100

g sub-sample was removed, weighed, and placed in a pre-cleaned sample container supplied

by the analytical laboratory. Fillet weights and sample weights were recorded on sample

processing data sheets and are listed in Tables 1 and 2 for Closed Area and Open Area

specimens, respectively. Sample jars were labeled with sample station ID, sample number,

species, collection date, time, and initials of processing personnel.

The sample and container were placed in a Ziploc bag labeled with station ID, sample number,

collection date, time, and personnel. The sample was placed in a second Ziploc bag and stored

at 4 +2 degrees Celsius. A Chain of Custody form was completed for all samples collected.

2.3.2 Juvenile Blue Crab

000139



Blue crabs were processed within 24 hours of collection in the Alcoa Clean Lab (located at the

Alcoa Point Comfort Facility), and remained on ice or in a refrigerator until processing was

complete. In the laboratory, crabs were rinsed with DI water and sorted by size on pre-cleaned

Teflon cutting boards. Individual blue crabs were measured, weighed, and placed in sample

containers. Each sample was a composite of 5 crabs measuring 25 to 75 mm in width.

Individual crab weights and total sample weights were recorded on sample processing data

sheets and are listed in Tables 3 and 4 for Closed Area and Open Area specimens,

respectively. Sample containers were labeled with the station ID, sample ID, collection date, and

time; and were placed in re-sealable plastic bags and placed in a secure refrigerator in the

Clean Lab. Samples were shipped overnight to Battelle for analysis.

3.0 ANALYTICAL RESULTS

Red drum and juvenile blue crab samples were analyzed for total mercury and percent moisture

by Battelle. Total mercury was measured by modified EPA Method 245.6, and the results were

reported in µg/g as wet weight. Benchmark received the final data packet from the analytical

laboratory during the second week of March 2006 and data validation/evaluation was completed

by Environmental Chemistry Services on 22 March 2006. Analytical results for red drum

collected from the Closed Area are presented in Table 1, and the results for red drum from the

Adjacent (Open) Areas are presented in Table 2. Analytical results for juvenile blue crabs

collected from the Closed Area are presented in Table 3, and the results for juvenile blue crabs

from the Adjacent (Open) Areas are presented in Table 4. Analytical results for both red drum and juvenile blue crab samples were validated according to

the Standard Operating Procedure Data Validation (Appendix E) in the Quality Assurance

Project Plan Alcoa (Point Comfort)/Lavaca Bay Superfund Site (August 22, 2005). All analytical

results were validated and may be included in the data used to evaluate the effectiveness of the

approved remedy and to meet monitoring requirements specified in the Consent Decree.

000140


Table 1 - Closed Area Red Drum Sample Stations, Sample IDs, Processing Data and Analytical Results

CLO1414 B12b-TF-08616 11/30/05 9:30 607 485 2100 175.8 67.3 80.3% 1.23CLO1414 B12b-TF-08617 11/30/05 9:30 581 470 2080 200 66.1 79.6% 0.341CLO1414 B12b-TF-08618 11/30/05 9:30 640 520 2500 265.5 87.2 80.5% 0.775CLO1414 B12b-TF-08619 11/30/05 9:30 615 510 2330 130.9 62.8 79.9% 1.20CLO5802 B12b-TF-08612 11/15/05 8:35 655 560 2650 199.2 82.9 76.6% 0.237CLO5802 B12b-TF-08613 11/15/05 8:35 605 515 2120 185.5 68 79.3% 1.29CLO5803 B12b-TF-08608 11/15/05 9:05 610 515 2360 125.5 69.6 80.6% 1.46CLO5803 B12b-TF-08609 11/15/05 9:05 568 465 1710 87.7 63.9 80.4% 0.793CLO5803 B12b-TF-08610 11/15/05 9:05 602 520 2170 149.1 76.4 79.9% 0.423CLO5803 B12b-TF-08611 11/15/05 9:05 620 530 2320 152.2 71.9 81.6% 1.11CLO5803 B12b-TF-08627 12/01/05 10:30 576 465 2000 127.3 63.5 79.9% 1.12CLO5806 B12b-TF-08628 12/01/05 9:50 535 450 1790 127.8 64.2 80.3% 1.35CLO5806 B12b-TF-08629 12/01/05 9:50 560 465 2020 124.4 65.3 73.5% 0.168CLO5806 B12b-TF-08630 12/01/05 9:50 540 450 1480 101.1 57 79.8% 1.99CLO5814 B12b-TF-08631 12/01/05 8:45 632 510 2330 158.3 71.3 81.6% 1.039CLO5814 B12b-TF-08632 12/01/05 8:45 610 505 2430 143.2 66.6 82.0% 0.931CLO5815 B12b-TF-08620 11/29/05 19:35 599 490 2010 160.2 65.2 79.8% 0.936CLO5815 B12b-TF-08621 11/30/05 9:15 515 430 1370 143.3 60.2 80.0% 0.918CLO5815 B12b-TF-08622 11/30/05 9:15 586 475 2170 232.1 59.7 77.2% 0.295CLO5815 B12b-TF-08623 11/30/05 9:15 510 415 1320 105.6 45.5 80.5% 0.779CLO5815 B12b-TF-08624 11/30/05 9:15 548 450 1510 128.6 42.7 80.3% 0.721CLO5818 B12b-TF-08604 11/15/05 11:20 615 535 2090 130.3 71.7 81.5% 0.971CLO5818 B12b-TF-08605 11/15/05 11:20 587 505 1900 96.5 67.7 80.4% 0.849CLO5818 B12b-TF-08606 11/15/05 11:20 575 480 1860 112.5 77.1 80.2% 0.503CLO6802 B12b-TF-08625 12/01/05 9:30 525 435 1430 113.9 68 80.8% 0.556CLO6802 B12b-TF-08626 12/01/05 9:30 535 435 1550 98.5 55.8 80.3% 0.470CLO6806 B12b-TF-08615 11/30/05 8:45 630 495 2250 169.3 68.8 81.0% 0.632LVB5504 B12b-TF-08614 11/15/05 10:05 654 465 1690 96.4 78.1 80.0% 1.64LVB5510 B12b-TF-08633 12/01/05 8:55 540 440 1740 107.7 57.2 80.1% 0.263LVB5513 B12b-TF-08607 11/15/05 10:45 617 510 2110 119 63.3 81.2% 0.956

586 483 1980 142.2 66.2 80.0% 0.865

Tissue Weight (g)

Sample Weight (g)

Note: Method detection limits are derived by the laboratory annually for each instrument. Sample specific method detection limits have as their basis these instrument-specific method limits but also incorporate each sample's matrix moisture content, extraction weight and any pertinent dilution factors. For tissue sample groups such as these with little moisture variability, an average moisture and sample size is used in the calculation of the sample specific method detection limit. This sample specific method detection limit then applies to all samples from the group analyzed on the same instrument. The sample specific method detection limit for this data group is 0.000401 ug/g total mercury (wet weight) based on an average moisture content of 76.1%.

Average Values

Total Hg wet weight (ug/g)

Total Length (mm)

Standard Length (mm)

Total Weight (g)

Percent MoistureSample IDStation ID Date Time



CLO5829 B12b-TF-08642 12/02/05 10:40 610 495 2450 192.5 65.6 77.6% 0.310CLO5829 B12b-TF-08643 12/02/05 10:40 561 460 1880 190.3 63.3 80.8% 0.847CLO5829 B12b-TF-08644 12/02/05 10:40 565 465 1810 142.4 59.5 79.6% 0.791CLO5829 B12b-TF-08645 12/02/05 10:40 550 450 1620 181.8 69.1 80.0% 0.223CLO5829 B12b-TF-08646 12/02/05 10:40 534 430 1570 159.1 72.5 79.8% 1.19CLO5830 B12b-TF-08641 12/02/05 10:05 679 565 2880 215 60 81.4% 0.264LVB5841 B12b-TF-08634 12/02/05 8:25 608 500 2170 172 66.3 79.8% 0.398LVB5841 B12b-TF-08635 12/02/05 8:25 645 530 2690 227.2 75.9 79.5% 0.760LVB5841 B12b-TF-08663 01/10/06 17:20 506 405 1310 118.7 50.4 79.5% 0.590LVB5841 B12b-TF-08664 01/10/06 17:20 507 395 1450 173 79.7 79.9% 0.238LVB5841 B12b-TF-08665 01/10/06 17:20 550 450 1940 141.9 68.3 79.2% 0.357LVB5841 B12b-TF-08666 01/11/06 8:55 590 480 2070 194.1 83.1 79.9% 0.418LVB5841 B12b-TF-08667 01/11/06 8:55 555 455 1710 177.1 89.9 78.9% 0.363LVB5841 B12b-TF-08668 01/11/06 8:55 580 475 2100 208.8 92.9 76.0% 0.282LVB5841 B12b-TF-08669 01/11/06 8:55 543 450 1570 180.3 81 79.6% 0.510LVB6837 B12b-TF-08647 12/13/05 9:10 512 430 1580 85 56.6 79.8% 0.598LVB6837 B12b-TF-08648 12/13/05 9:10 517 435 1470 62 50.2 78.9% 0.598LVB6837 B12b-TF-08649 12/13/05 9:10 510 420 1680 102.2 62.4 79.7% 0.433LVB6837 B12b-TF-08650 12/13/05 9:10 568 485 2060 121.6 65.7 80.6% 0.401LVB6837 B12b-TF-08651 12/13/05 9:10 608 515 2170 133.9 78.3 79.1% 0.303LVB6837 B12b-TF-08652 12/13/05 9:10 535 450 1730 111.1 59.3 79.8% 0.369LVB6837 B12b-TF-08653 12/13/05 9:10 528 445 1600 69.7 53 80.0% 0.680LVB6837 B12b-TF-08654 12/13/05 9:10 595 450 2240 122.2 59.1 80.4% 0.805LVB6837 B12b-TF-08655 12/13/05 9:10 532 455 1730 125.8 67.5 80.5% 0.873LVB6837 B12b-TF-08656 12/13/05 9:10 525 435 1460 108.8 58.6 78.2% 0.264LVB6837 B12b-TF-08657 12/13/05 9:10 556 465 1460 62.4 48.6 81.4% 0.193LVB6837 B12b-TF-08658 12/13/05 9:10 668 570 3260 211.2 65.4 75.4% 0.303LVB6837 B12b-TF-08659 12/13/05 9:10 570 480 2240 122.6 62.6 80.1% 0.722LVB6837 B12b-TF-08660 12/13/05 9:10 575 480 2120 138.9 59.2 79.8% 0.410LVB6837 B12b-TF-08661 12/13/05 9:10 649 530 3270 200.9 65.5 75.9% 0.249LVB6837 B12b-TF-08662 12/13/05 9:10 690 585 3440 179.2 64.5 78.7% 0.452LVB6853 B12b-TF-08636 12/01/05 9:00 660 555 2960 345.9 70.2 77.4% 0.333LVB6853 B12b-TF-08637 12/01/05 9:00 615 510 2190 259.4 60.5 79.6% 0.433LVB6853 B12b-TF-08638 12/01/05 9:00 535 440 1610 166.8 47.8 79.8% 0.421LVB6853 B12b-TF-08639 12/01/05 9:00 602 490 2100 193.1 65.3 79.5% 0.413LVB6853 B12b-TF-08640 12/01/05 9:00 613 510 2470 189 60.6 78.9% 0.336

576 476 2057 160.7 65.5 79.3% 0.476

Standard Length (mm)

Total Weight (g)

Tissue Weight (g)

Average Values


Table 2 - Adjacent Area Red Drum Sample Stations, Sample IDs, Processing Data and Analytical ResultsPercent Moisture

Total Hg wet weight (ug/g)Sample IDStation ID Date Time Sample

Weight (g)

Total Length (mm)


000142


Station ID Sample ID Date Time Width (mm)Crab Weight

(g)Sample

Weight (g)Total Hg (µg/g)

Wet WtPercent Moisture

75 22.257 10.9

CLO1414 SUP-TS-08552 10/17/2005 13:55 44 6.5 48.4 0.0901 70.836 3.740 5.475 23.053 9.7

CLO1414 SUP-TS-08553 10/17/2005 13:55 42 4.6 39.6 0.156 75.026 1.025 1.457 18.831 2.8

CLO5802 B12b-TS-08700 10/6/2005 10:10 30 2.9 28.8 0.272 71.930 2.926 1.652 13.934 3.8

CLO5802 B12b-TS-08701 10/6/2005 10:10 32 3.0 25.1 0.296 69.931 3.127 1.661 20.546 8.9

CLO5802 B12b-TS-08702 10/6/2005 10:10 31 2.8 36.3 0.287 74.131 2.827 1.454 16.251 12.3

CLO5802 B12b-TS-08703 10/6/2005 10:10 30 2.6 35.4 0.294 70.131 2.725 1.653 14.943 7.5

CLO5802 SUP-TS-08545 10/12/2005 08:40 43 7.7 48.8 0.561 69.444 9.745 9.247 9.528 2.2

CLO5803 B12b-TS-08704 10/10/2005 14:10 29 1.6 22.9 0.556 67.041 5.637 4.458 17.427 1.7

CLO5803 B12b-TS-08710 10/12/2005 16:34 31 2.7 26.5 0.703 65.128 2.237 2.755 9.928 1.8

CLO5900 B12b-TS-08705 10/12/2005 10:12 26 1.1 14.6 0.0821 74.925 1.025 0.9

Table 3 - Closed Area Juvenile Blue Crab Sample Stations, Sample IDs, Processing Data, and Analytical Results

Lavaca Bay Finfish and Shellfish Monitoring Program 2005 13 of 19000143



(g)Sample




36 3.039 4.1

CLO5900 B12b-TS-08706 10/12/2005 10:12 29 1.9 11.4 0.0891 73.428 1.425 1.051 15.641 5.7

CLO5900 B12b-TS-08707 10/12/2005 17:25 39 5.6 33.7 0.153 67.038 4.927 2.048 7.130 2.5

CLO5900 SUP-TS-08511 10/6/2005 11:33 29 2.4 15.6 0.0763 73.329 2.126 1.262 14.933 3.0

CLO5900 SUP-TS-08512 10/10/2005 16:00 30 2.3 25.1 0.0697 76.330 2.532 2.931 2.427 1.5

CLO5900 SUP-TS-08513 10/10/2005 16:00 31 2.5 12.2 0.0715 74.033 2.736 3.048 9.368 24.6

CLO6802 B12b-TS-08715 10/17/2005 15:05 41 10.1 51.9 0.191 61.739 4.534 3.659 18.054 12.5

CLO6802 B12b-TS-08716 10/17/2005 15:05 43 5.8 44.6 0.183 67.845 4.839 3.645 8.946 9.8

CLO6802 B12b-TS-08717 10/17/2005 15:05 40 4.8 31.0 0.161 66.239 4.931 2.660 20.240 4.1

LVB5504 B12b-TS-08708 10/12/2005 17:10 40 3.6 32.1 0.440 65.532 2.626 1.5




(g)Sample




51 10.453 12.8

LVB5504 B12b-TS-08709 10/12/2005 17:10 39 4.6 33.6 0.357 67.334 3.235 2.840 5.237 4.1

LVB5504 B12b-TS-08714 10/14/2005 09:30 41 4.6 21.0 0.178 68.739 5.031 2.552 10.232 2.6

LVB5513 B12b-TS-08711 10/12/2005 10:25 28 1.9 17.2 0.0923 70.727 1.725 1.152 13.833 2.6

LVB5513 B12b-TS-08712 10/12/2005 10:25 32 2.8 22.2 0.166 67.527 1.825 1.435 3.734 2.6

LVB5513 B12b-TS-08713 10/12/2005 10:25 31 2.1 13.5 0.103 71.631 2.633 2.869 22.470 19.5

LVB5517 B12b-TS-08718 10/17/2005 14:45 42 5.5 61.4 0.152 66.050 7.742 6.660 13.045 7.4

LVB5517 B12b-TS-08719 10/17/2005 14:45 59 14.4 46.8 0.131 71.244 6.141 6.061 13.454 11.9

LVB5517 B12b-TS-08720 10/17/2005 14:45 47 7.3 40.7 0.137 71.838 3.840 4.6

40 6.3 31.1 0.224 69.4Average Values





(g)Sample



66 19.130 2.1

LVB5838 B12b-TS-08734 1/30/2006 11:00 27 1.8 25.5 0.0294 78.725 1.526 1.353 14.225 1.2

LVB5838 B12b-TS-08735 1/30/2006 11:00 31 3.0 23.1 0.0464 76.932 2.430 2.349 9.834 2.8

LVB5838 B12b-TS-08736 2/2/2006 12:50 29 2.6 22.7 0.0336 69.730 2.140 5.653 10.833 3.0

LVB5838 B12b-TS-08737 2/2/2006 12:50 29 2.3 24.3 0.0311 73.231 3.140 5.326 1.459 15.7

LVB5838 B12b-TS-08738 2/2/2006 12:50 36 3.4 25.0 0.0339 70.835 2.829 1.933 3.333 2.5

LVB5839 B12b-TS-08733 1/27/2006 14:50 33 2.5 11.3 0.013 68.729 1.726 1.554 10.956 11.8

LVB5839 B12b-TS-08739 1/30/2006 12:15 34 2.4 29.5 0.018 75.132 3.425 1.174 26.749 6.8

LVB6837 B12b-TS-08721 11/15/2005 12:30 40 5.1 45.2 0.0689 71.338 4.332 2.774 19.240 6.4

LVB6837 B12b-TS-08722 11/15/2005 12:30 35 3.8 34.1 0.0666 78.232 2.729 2.0

Table 4 - Adjacent Area Juvenile Blue Crab Sample Stations, Sample IDs, Processing Data, and Analytical Results




(g)Sample




69 21.441 5.5

LVB6837 B12b-TS-08723 11/15/2005 12:30 31 2.8 34.1 0.0817 66.228 1.930 2.465 17.051 8.6

LVB6837 B12b-TS-08724 11/15/2005 12:30 54 11.3 40.5 0.0791 70.230 1.930 2.060 14.760 10.7

LVB6837 B12b-TS-08725 11/15/2005 12:30 28 2.2 31.3 0.0670 72.230 2.030 1.860 14.447 4.5

LVB6850 B12b-TS-08747 2/13/2006 12:10 34 2.5 23.4 0.0155 8334 2.527 1.630 2.334 2.4

LVB6850 B12b-TS-08754 2/23/2006 12:20 51 10.4 24.7 0.0354 69.347 7.431 2.552 14.449 11.5

LVB6852 B12b-TS-08726 11/15/2005 14:40 45 9.0 41.5 0.0880 65.139 5.329 1.760 16.743 7.1

LVB6853 B12b-TS-08727 11/15/2005 15:45 60 16.6 47.5 0.0643 72.138 5.827 2.058 15.248 10.6

LVB6853 B12b-TS-08728 11/15/2005 15:45 57 14.3 46.9 0.117 72.041 5.429 1.759 17.858 17.3

LVB6853 B12b-TS-08729 11/15/2005 15:45 36 4.7 60.3 0.0657 69.063 19.226 1.7




(g)Sample




58 16.352 11.7

LVB6853 B12b-TS-08730 11/15/2005 15:45 39 5.3 44.2 0.0570 70.540 6.936 4.326 2.028 1.5

LVB6870 B12b-TS-08742 2/6/2006 11:25 42 10.5 50.6 0.0292 67.151 12.129 1.327 1.531 3.1

LVB6870 B12b-TS-08743 2/9/2006 11:40 30 2.9 46.2 0.0615 67.753 13.028 1.841 7.626 2.2

LVB6870 B12b-TS-08745 2/9/2006 11:40 35 3.5 24.7 0.0527 73.152 9.628 2.133 3.630 2.4

LVB6870 B12b-TS-08746 2/13/2006 13:10 31 2.7 32.1 0.0365 72.632 2.670 21.048 11.640 5.6

LVB6870 B12b-TS-08757 2/27/2006 11:54 51 8.4 30.4 0.0381 70.233 3.230 1.963 17.643 6.2

LVB6870 B12b-TS-08758 2/27/2006 11:54 31 2.8 30.0 0.0509 66.126 2.029 1.571 22.570 21.7

LVB6871 B12b-TS-08749 2/16/2006 10:35 43 6.3 76.8 0.0491 67.334 2.667 23.725 1.231 2.3

LVB6871 B12b-TS-08755 2/23/2006 10:50 27 1.4 34.6 0.0301 73.374 27.730 2.4




(g)Sample




31 2.359 16.4

LVB6872 B12b-TS-08752 2/23/2006 11:30 67 20.7 65.3 0.0276 65.453 13.155 13.475 25.555 10.7

LVB6872 B12b-TS-08753 2/23/2006 11:30 39 4.1 44.7 0.0149 66.233 2.929 2.163 18.663 17.1

LVB6872 B12b-TS-08756 2/27/2006 11:15 49 10.6 56.8 0.0171 63.437 5.040 6.0

41 7.3 37.6 0.0473 70.8Average Values


APPENDIX C

000150

000151

000152

{.)

€6--Ez

Tt--

v)lr(c()ZalrIdd

rrldtz

d.'

l

()v)

a4f

F-(

zF-r

;. u-)

v€

)

A.

6l

ta o\

zq

F(

\

1.

.

'r-t

ri +

: l

-Fl

::

l

A

':

i

A

:1

.

z.,1

o

000153

C\()br)

+r-r--Gl

atr(l)

zgoaot.rrlI9.E(qP

rd

rr'l

gz

+\oc.-

aFr

(t)

zo(t)ot{

rYlIgtrb#gl

rqz

lr

zL.

(l)

zcFo

rt),rit-tgr

ht{zl{L.;i

rav

etieF

rC!

(a

dz

qr-]

-

FazF]

abaklrtt

&

000154

tftoot)

a€oF]g(l)()a

otrt4.

\JF\lz-ir lf,l

A-

FI

ae

zq

-(\t.l

FFrt)

zFl

aFI

-r-'t4

000155

${)br)

b{)trF(ll(I))IA|.o+)(.}

q)a)grasF

{

E,!E3tr()(l)

+f=oa

atrFr

*(JEi

trFr

ztlLr;, rf)

\le

AC

IU

)€i

zq

FN

F-l *

FFI

0zafrl.

h

rgtLA

l-c)

a+tul-

z

eo€€()(l)|..oz000156

rn(.)

+cac.l

PCN

Otr()zat<c)Pz(JO-rrac.l

orY

.

fi

U-

aA

O6

Qr

FX

a-

,k

x(

l)

=€

:v

>=

n 0.)

ZF

lJ

o

(l)

t-l

zi\

U-dIc)ov)tr(l)o)

fr

.

r\

zOt{ozt_{

alirrl

r, itfu

..r iq

, |

!,.

o

lf

d

.:F

F

tl. :

() llt

A

ii,v

i.

Fi

i,' :

Ai

Yt

-l.r,'!

t .*

ii

#'

d

8=

i

fF

i S

I(,

s\z

q-

Gl

ts*

:-

Ftia:

FZ2

000157

\oc)b0$

eodfl

€eo(n()b0E

>l

Faa

V2

t-t

4.

\JFHl.{ztdL{;, rav

e

Fr S

!(,) o\z

q

traz.'ru)r--l.

h

f-ltL

CJ

t-qt-€CN

!ao€a

.ntirY

l

()Odb!+

sa oo=

tr)lr

iJA

a

JU

7Z

!)

|(

Da

ov

A

Fs-

rr{'xl

o

H$

',O

EW

r

000158

r-q)b0(g

c)b0E

,l,{

qit\lIol{?l(ll()tr(+agF<(l)t{=c.)-LIae()(l)r.t|.z

at4()Ft-{

z-Lir lf)

vc

)trleF

i S

!u)

oiz

q-(\

FldazFT

afrlr

h

Fd

&

,Qoo(\tlc)til

',

(q

r(

D.

L.

i

(H

1"

i .:'

gF<(l)t{IokIa9(-)

c)

€a

000159

ooa)b0(tl

(l)a0E

${

oo)bt)Ef-.i

CI

atrtrfrfh

FtrF..

zvir lI)

ve

Lq

(tl ct\

ZQ

lrl -F-at-lzF

lafr]c5rl&

000160

APPENDIX D

000161

CHLOR.ALKALI AREASITE INSPECTION LOG

Addit ional Comments:

O Cpf Sfcqnr.a ,; l gotu Jrtal-rVtL. y€t-{ 6e16 f,rr-e ̂

lnspector's .Name: ;,,X-Atq (mK/,J

Affit iation: P f3 td , Lut,

Weather: SLrr.+ruv 1tlfll+*srL n , t ) x S c r t L i L - J * E

Inspector'sSignature:

Date:

Time Beqin:

l z b t .aS

04 coI

Temperatu r", Lu{ 'rTime End: 0 lJo

Sheet I of ISpecific ltem

to lnsoectTypical Problems

EncounteredConditionNormal

ConditionAbnormal

Comments or Corrective Action(s)lmplemented and Dates

cap ErosionSettlingPondingWashoutsHolesVehicle RutsIntrusive Weeds

Vb-V9/V{n-/'

0IIIIII h

Signage In PlaceLeoible

X"Sr"

0I

Storm Drains GratesDebris

Vv,.

Il

No Equipmentor Waste

Proper Storage Tlil,/

II

ExtractionWells

ControllersBoxesElectrical ConduitTransfer Pipino

wl"zl t .t - /

ilII0

TreatmentSystem

EquipmentLeaksOdors

n u -| -,'l/'-I

IIII

Revision B/11/2005

000162

Documents

2005 REMEDIAL ACTION ANNUAL EFFECTIVENESS REPORT …including the results of investigations and system design, is provided in the CAPA Focused Investigation Data Report (Alcoa, 1998)