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[AOC-65 Table of Contents]

Geophysical Survey Summary Report for AOC-65, September 2003

AFCEE/ERD QAE Brooks AFB, Texas F41624-00-D-8024
Task Order 0058

Table of Contents

Acronyms and Abbreviations

Section 1 - Introduction

1.1   Purpose of Report

1.1.1   Objective of Study

1.1.2   Scope Of Study

1.1.3   Project Authorization

1.1.4   Report Organization

Section 2 - Site Conditions

2.1   Site Description

2.2   Potential Sources of Contamination

2.3   Site Environmental Setting

2.3.1   Site Soils and Topography

2.3.2   Geology

2.3.3   Hydrology

2.3.4   Utilities

Section 3 - Geophysical Testing Methodology

3.1   Electrical Resistivity Imaging

3.1.1   Equipment

3.1.2   Data Acquisition

3.1.3   Data Processing

3.1.4   Microgravity

3.1.5   Equipment

3.1.6   Data Acquisition

3.1.7   Data Processing

3.2   Very Low Frequency Electromagnetics

3.2.1   Equipment

3.2.2   Data Acquisition

3.2.3   Data Processing

3.3   Seismic Reflection

3.3.1   Equipment

3.3.2   Data Acquisition

3.3.3   Data Processing

3.4   Induced Polarization

3.4.1   Equipment

3.4.2   Data Acquisition

3.4.3   Data Processing

3.5   Spontaneous Potential

3.5.1   Equipment

3.5.2   Data Acquisition

3.5.3   Data Processing

Section 4 - Geophysical Survey Results

4.1   Resistivity Surveys

4.1.1   Findings

4.1.2   Considerations

4.1.3   Geologic Conditions

4.1.4   3-D Effects

4.1.5   Cultural Features

4.1.6   Equipment Problems

4.2   Microgravity Surveys

4.2.1   Findings

4.2.2   Considerations

4.3   VLF Surveys

4.3.1   Findings

4.3.2   Considerations

4.4   Seismic Reflection Surveys

4.4.1   Findings

4.4.2   Considerations

4.5   SP Survey

4.6   Geophysical Results Summary

Section 5 - Drilling and Well Installation

5.1   Rock Coring

5.2   Borehole Logging

5.3   VEW/VMP/PZ Completion

5.4   Geologic Interpretation

Section 6 - Conclusions and Recommendations

6.1   Conclusions

6.2   Recommendations

Section 7 - References

Appendices

Appendix A   Electrical Resistivity Survey Results

Appendix B   Microgravity Survey Results

Appendix C   Very Low Frequency Electromagnetic Survey Results

Appendix D   Seismic Reflection Survey Results

Appendix E   Induced Polarization Results

Appendix F   Spontaneous Potential Survey Results

Appendix G   Drilling Logs

Figures

Figure 2.1   AOC-65 Study Area

Figure 2.2   AOC-65 Utility Location Map

Figure 3.1   Resistivity Survey Location Map

Figure 3.2   Plot of Depth Versus Size for Anomaly Yielding Gravity Response of 0.002 mGals

Figure 3.3   Microgravity Survey Location Map

Figure 3.4   VLF Survey Location Map

Figure 3.5   Location of Seismic Reflection Surveys

Figure 3.6   IP Survey Location Map

Figure 3.7   SP Survey Location Map

Figure 4.1   Location of Resistivity Imaging Anomalies

Figure 4.2   Predicted Gravity Response for Horizontal Cylinder

Figure 4.3   Predicted Gravity Response for a Faulted Layer

Figure 4.4   Microgravity Anomaly Location Map

Figure 4.5   Location of Glen Rose Limestone/Bexar Shale Faults

Figure 4.6   Location of IP Anomalies

Figure 4.7   Composite Geophysical Results

Figure 5.1   Location of AOC-65 PZs, VEWs and VMPs

Figure 5.2   AOC-65 Geologic Cross-Section

Tables

Table 3.1   Resistivity Survey Summary AOC-65 Treatability Study

Table 3.2   Seismic Reflection Survey Acquisition Parameters AOC-65
Treatability Study

Table 5.1   Drilling Location Rationale AOC-65 Treatability Study

Table 5.2   Summary of Well Construction DetailsAOC65 Treatability Study

Acronyms and Abbreviations

2-D

Two-dimensional

3-D

Three-dimensional

AGI

Advanced Geosciences, Inc.

AOC

Area of concern

BFZ

Balcones fault zone

bgs

below ground surface

CDP

Common depth point

cm/s2

Centimeter per second squared

COC

Chemical of concern

CSSA

Camp Stanley Storage Activity

dB

decibel

EM

Electromagnetic

GMA

Geophysical Micro Applications

GPI

GeoProjects International

GPR

Ground penetrating radar

Hz

Hertz

IP

Induced polarization

iVi

Industrial Vehicles Inc.

KHz

Kilohertz

L&R

LaCoste and Romberg

mGal

The centimeter-gram-second unit of acceleration of gravity, equal to 1 cm/s2

ms

millisecond

NMO

Normal move-out

PC

Personal computer

PCBs

Polychlorinated biphenyl

PCE

Tetrachloroethene

PVC

Polyvinyl chloride

PZ

Piezometer

RCRA

Resource Conservation and Recovery Act

RFI

RCRA Facility Investigation

RMS

Root mean square

SP

Spontaneous potential

SVE

Soil vapor extraction

SVOC

Semivolatile organic compounds

SWMU

Solid Waste Management Unit

TCE

Trichloroethene

TPH

Total petroleum hydrocarbon

TWT

Two-way-travel

USDA

United States Department of Agriculture

USGS

United States Geologic Survey

VEW

Vapor extraction well

VLF

Very low frequency electromagnetics

VMP

Vapor monitoring point

VOC

Volatile organic compound

WBS

Work Breakdown Structure