Andrews Air Force Base, Maryland
Total Page:16
File Type:pdf, Size:1020Kb
RECORD OF DECISION FT-03, Fire Training Area 2 Andrews Air Force Base, Maryland ~J ••• United States• Air Force United States Environmental Protection Agency Region III FT-03, Fire Training Area 2 Andrews Air Force Base, MD Record of Decision September 2008 TABLE OF CONTENTS 1.0 DECLARATION .......................................................................................... 1 1.1 Site Name and Location ....................................................................................... 1 1.2 Statement of Basis and Purpose .......................................................................... 1 1.3 Assessment of the Site......................................................................................... 1 1.4 Description of the Selected Remedy .................................................................... 1 1.5 Statutory Determinations ...................................................................................... 4 1.6 ROD Data Certification Checklist.......................................................................... 5 1.7 Authorizing Signatures ......................................................................................... 5 2.0 DECISION SUMMARY................................................................................ 6 2.1 Site Name, Location, and Description .................................................................. 6 2.2 Site History, Enforcement Activities, and Investigations ....................................... 6 2.2.1 Site History .............................................................................................. 6 2.2.2 Previous Investigations............................................................................ 7 2.2.3 Focused Feasibility Study (2007)........................................................... 10 2.2.4 Enforcement Activities ........................................................................... 10 2.3 Community Participation..................................................................................... 11 2.4 Scope and Role of Response Action .................................................................. 11 2.5 Site Characteristics............................................................................................. 12 2.5.1 Physical Setting ..................................................................................... 12 2.5.2 Conceptual Site Model........................................................................... 13 2.5.3 Nature and Extent of Contamination...................................................... 14 2.6 Current and Potential Future Land and Water Uses........................................... 17 2.7 Summary of Site Risks ....................................................................................... 18 2.7.1 Baseline Human Health Risk Assessment Process............................... 18 2.7.2 Baseline Human Health Risk Assessment Results—General................ 21 2.7.3 Baseline Human Health Risk Assessment Results—Soil ...................... 22 2.7.4 Baseline Human Health Risk Assessment Results—Groundwater........ 22 2.7.5 Uncertainty Associated with HHRA for Soil and Groundwater............... 23 2.7.6 Ecological Risk Assessment.................................................................. 23 2.7.7 Conclusions of Risk Assessment and Basis for Action.......................... 23 2.8 Remedial Action Objectives................................................................................ 24 2.9 Description of Remedial Alternatives for Soil and Groundwater ......................... 24 2.9.1 Alternative 1: No Action ........................................................................ 24 2.9.2 Alternative 2: Institutional Controls ....................................................... 25 2.9.3 Alternative 3: Institutional Controls with Monitoring ............................... 25 2.9.4 Alternative 4: Excavation and Off-Site Disposal of Contaminated Soil and Institutional Controls with Monitoring .............................................. 26 2.9.5 Alternative 5: In-Situ Chemical Oxidation and Institutional Controls with Monitoring.............................................................................................. 27 2.9.6 Common Elements and Distinguishing Features of Each Alternative.... 28 Page i FT-03, Fire Training Area 2 Andrews Air Force Base, MD Record of Decision September 2008 2.9.7 Expected Outcomes of Each Alternative ............................................... 29 2.10 Summary of Comparative Analysis of Alternatives............................................. 29 2.10.1 Threshold Criteria .................................................................................. 30 2.10.2 Balancing Criteria .................................................................................. 30 2.10.3 Modifying Criteria................................................................................... 31 2.11 Principal Threat Wastes ..................................................................................... 31 2.12 Selected Remedy for Soil and Groundwater....................................................... 32 2.12.1 Rationale for the Selected Remedy ....................................................... 32 2.12.2 Detailed Description of the Selected Remedy ....................................... 33 2.12.3 Summary of the Estimated Remedy Costs ............................................ 36 2.12.4 Estimated Outcomes of Selected Remedy ............................................ 37 2.13 Statutory Determinations for Groundwater Remedy........................................... 37 2.13.1 Protection of Human Health and the Environment................................. 38 2.13.2 Compliance with ARARs........................................................................ 38 2.13.3 Cost Effectiveness................................................................................. 38 2.13.4 Utilization of Permanent Solutions and Alternative Treatment (or Resource Recovery) Technologies to the Maximum Extent Practicable 39 2.13.5 Five-Year Review Requirements ........................................................... 39 2.14 Documentation of Significant Changes............................................................... 39 3.0 RESPONSIVENESS SUMMARY.............................................................. 40 3.1 Overview ............................................................................................................ 40 3.2 Background on Community Involvement ............................................................ 40 3.3 Summary of Comments Received During the Public Comment Period and Air Force Responses ............................................................................................... 41 4.0 REFERENCES.......................................................................................... 43 FIGURES 2-1 Andrews Air Force Base and Vicinity Map 2-2 Location of FT-03 Within Andrews AFB 2-3 1960 Aerial Photograph Showing Former Fire Training Area Near Central Portion of FT-03 2-4 Aerial Photograph, Year 2008 Golf Course 2-5 Soil Sampling Locations and Areas of Soil Contamination 2-6 Groundwater Sampling Locations with Detected Concentrations (µg/L) Driving Potential Risk 2-7 Conceptual Site Model Diagram Prior to the Human Health Risk Assessment 2-8 Boundary of Institutional Controls Implementation Page ii FT-03, Fire Training Area 2 Andrews Air Force Base, MD Record of Decision September 2008 TABLES 2-1 Summary of Receptor Cancer Risks Exceeding 1 x 10-4, Unrestricted Use Scenario 2-2 Summary of Receptor Non-Cancer Hazard Indexes (HI) Exceeding 1, Unrestricted Use Scenario 2-3 Summary of Detected COCs with Associated Locations at FT-03 2-4 Cost Comparison for Remedial Alternatives 2-5 Comparative Analysis of NCP Evaluation Criteria for the FT-03 Remedial Alternatives 2-6 Cost Summary—Alternative 3, Institutional Controls with Monitoring APPENDICES Appendix A Maryland Department of the Environment Concurrence Letter Appendix B Public Meeting Newspaper Notices Appendix C Summary Transcript of the Public Meeting for the Proposed Remedial Action Plan – FT-03 Site, February 21, 2008 Page iii FT-03, Fire Training Area 2 Andrews Air Force Base, MD Record of Decision September 2008 ACRONYMS and ABBREVIATIONS AFB Air Force Base ARAR Applicable or Relevant and Appropriate Requirement BEHP Bis(2-ethylhexyl)phthalate BTEX Benzene, toluene, ethylbenzene, xylenes CD-ROM Compact disc-read only memory CERCLA Comprehensive Environmental Response, Compensation, and Liability Act CFR Code of Federal Regulations COC Contaminant of concern COMAR Code of Maryland Regulations COPC Contaminant of potential concern CSF Cancer slope factor CSM Conceptual site model D.C. District of Columbia DCE Dichloroethene DP Direct push ER Environmental restoration ERA Ecological Risk Assessment FFS Focused Feasibility Study FT-03 Fire Training Area 2 GIS Geographic Information System gpm Gallons per minute HHRA Human Health Risk Assessment HI Hazard index HQ Hazard quotient IC Institutional control ISCO In-situ chemical oxidation MCL Maximum Contaminant Level MD Maryland MDE Maryland Department of the Environment mg/kg Milligram per kilogram MOGAS Motor vehicle gasoline MW Monitoring well Page iv FT-03, Fire Training Area 2 Andrews Air Force Base, MD Record of Decision September 2008 NCP National Oil and Hazardous Substances Pollution Contingency Plan (commonly referred to as the National Contingency Plan) NPL National Priorities