[SWMU B-23]

Solid Waste Management Unit B-23 Closure Report, April 2005

Table of Contents

Section 1 - Introduction

1.1    Closure Standard

1.2   Background and Site Description

1.2.1   CSSA

1.2.2   SWMU B-23

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

1.4   Previous Investigations

1.4.1   Geophysical Survey

1.4.2   Soil Gas Survey Samples

1.4.3   Surface and Subsurface Soil Samples

Section 2 - Closure Activities

2.1   Excavation and Disposal

2.2   Confirmation Sampling

Section 3 - Conclusions and Closure Certification

3.1   Conclusions

3.1.1   Metals

3.1.2   VOCs

3.1.2.1   Toluene

3.1.2.2   Dichlorofluoromethane

3.2   Evaluation of Data Quality Objectives Attainment

3.3   Closure Certification

Figures

Figure B23-1   Site Map

Figure B23-2   Soils and Topographic Map

Figure B23-3   Geologic Setting

Figure B23-4   Sample Location Map

Figure B23-5   Site Location Map

Figure B23-6   SWMU B-23 Aerial Photographs

Figure B23-7   Geologic Setting

Figure B23-8   Closure Sample and Soil Boring Location

Figure B23-9   Excavation Photographs

Tables

Table B23-1   SWMU B-23 Summary of Chemical Constituents Detected in Soil Gas, August 1996

Table B23-2   Summary of Chemical Constituents Detected in Soil, March 2000

Table B23-3   SWMU B-23 Closure Confirmation Sampling Results

Appendices

Appendix A   Analytical Results Summary

Appendix B   Waste Manifests

Appendix C   Data Verification Reports

Appendix D   Evaluation of Data Quality Objectives Attainment

Appendix E   Figures and Tables from B-23 RFI Report