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[SWMU B-20/21]

Final SWMU B-20 and B-21 RCRA Facility Investigation Report, July 2002

Table of Contents

Section 1 - Introduction

1.1   Background and Site Description

1.1.1   CSSA1.1.2   SWMU B-20/21

1.2   Environmental Setting

1.2.1   Site Soils and Topography

1.2.2   Geology

1.2.3   Hydrology

1.2.4   Cultural Resources

1.2.5   Potential Receptors

1.3   Previous Investigations

1.3.1   Preliminary Screening, 1994

1.3.2   Phase I Remedial Investigation, 1994-1995

1.3.3   Phase II Remedial Investigation, 1995-1996

1.4   Closure Standard

Section 2 - Field Investigation

2.1   Field Actions

2.1.1   UXO Clearance

2.1.2   Soil Stockpile Disposition Samples

2.1.3   Waste Removal

2.1.4   Soil Borings

2.1.5   Groundwater Samples

2.1.6   Bench-Scale Treatability Studies

2.1.7   Phosphate-Induced Metals Stabilization Pilot Study

2.1.8   Geophysical Survey

2.1.9   Soil Gas Survey

2.1.10   Surface Soil Samples

2.2   Results and Comparisons

2.2.1   UXO Clearance

2.2.2   Soil Stockpile Disposition Samples

2.2.3   Waste Removal

2.2.4   Soil Borings

2.2.5   Groundwater Samples

2.2.6   Bench-Scale Treatability Studies

2.2.7   Phosphate-Induced Metals Stabilization Pilot Study

2.2.8   Geophysical Survey

2.2.9   Soil Gas Survey

2.2.10   Surface Soil Samples

Section 3 - Conclusions and Recommendations

3.1   Conclusions

3.2   Evaluation of Data Quality Objectives Attainment

3.3   Recommendations

Appendices

Appendix A   Summary of Recovered UXO Items

Appendix B   Analytical Results Summary

Appendix C   Perchlorate Analytical Results

Appendix D   Evaluation of Data Quality Objectives Attainment

Appendix E   Data Verification Reports

Appendix F   Site Photographs

Appendix G   Previous Investigation Maps (Not Available Electronically)

Figures

Figure B20/21-1   Site Location Map

Figure B20/21-2   Soils and Topographic Map

Figure B20/21-3   Geologic Setting

Figure B20/21-4   Sample Location Map

Figure B20/21-5   UXO Excavation Map

Tables

Table B20/21-1   Summary of Sifted Soil Analytical Program

Table B20/21-2   Summary of Chemical Constituents Detected in Sifted Soil, March and April 2000

Table B20/21-3   Summary of Metals Levels Above Background in Sifted Soil

Table B20/21-4   Summary of Chemical Constituents Detected in Subsurface Soils, March 2000