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[AOC 50 Table of Contents]

Final AOC-50 Closure Report, January 2005

Table of Contents

Section 1 - Introduction

1.1   Closure Standard

1.2   Background and Site Description

1.2.1   CSSA

1.2.2   AOC-50

1.2.2.1   Site Description

1.2.2.2   Potential Sources of Contamination

1.2.2.3   Site Location

1.3   Site Environmental Setting

1.3.1   Site Soils and Topography

1.3.2   Geology

1.3.3   Hydrology

1.3.4   Cultural Resources

1.3.5   Potential Receptors

1.4   Previous Investigations

1.4.1   Geophysical Survey

1.4.2   Surface Soil Samples

1.4.3   Subsurface Soil Samples

1.4.4   Excavation Activities

Section 2 - Closure Activities

2.1   Excavation and Disposal

2.2   Confirmation Sampling

Section 3 - Conclusions and Recommendations

3.1   Conclusions and Recommendations

3.2   Evaluation of Data Quality Objectives Attainment

3.3   Closure Certification

Appendices

Appendix A ‑ Waste Manifests

Appendix B ‑ Statistical Evaluation

Appendix C ‑ Analytical Results Summary

Appendix D ‑ Evaluation of Data Quality Objectives Attainment

Appendix E ‑ Data Verification Reports

Figures

Figure AOC50-1   Site Location Map

Figure AOC50-2   Soils and Topographic Map

Figure AOC50-3   Geologic Setting

Figure AOC50-4   Geophysical Survey Grid Location

Figure AOC50-5   Sample Location Map

Figure AOC50-6   Electromagnetic Data, In-Phase

Figure AOC50-7    Electromagnetic Data, Quadrature Phase

Figure AOC50-8   Ground Penetrating Radar Profile 11

Figure AOC50-9   Ground Penetrating Radar Profile 14

Figure AOC50‑10   Site Location Map

Figure AOC50‑11   Geologic Setting

Figure AOC50‑12   AOC‑50 Sample Location Map

Tables

Table AOC50-1   Summary of Detected Constituents, December 1999

Table AOC50-2   Summary of Detected Constituents, Surface Soil Samples, August 2001

Table AOC50-3   Summary of Detected Constituents, Subsurface Soil Samples, August 2001

Table AOC50-4   Summary of Detected Constituents, Sample AOC50 NP-1

Table AOC50‑5   AOC‑50 Closure Confirmation Sampling Results