EPA/ROD/R09-02/635 2002 EPA Superfund Record of Decision: ANDERSEN AIR FORCE BASE EPA ID: GU6571999519 OU 04 YIGO, GU 07/02/2002 THE UNITED STATES AIR FORCE INSTALLATION RESTORATION PROGRAM FINAL RECORD OF DECISION FOR HARMON ANNEX OPERABLE UNIT ANDERSEN AIR FORCE BASE, GUAM July 2002 THE UNITED STATES AIR FORCE INSTALLATION RESTORATION PROGRAM FINAL RECORD OF DECISION FOR HARMON ANNEX OPERABLE UNIT ANDERSEN AIR FORCE BASE, GUAM July 2002 Form Approved REPORT DOCUMENTATION PAGE OMB No 0704-0188 Public reporting burden for this collection of information is estimated to average 1 hour per response, including the time for reviewing instructions, searching existing data sources, gathering and maintaining the data needed, and completing and reviewing the collection of information. Send comments regarding this burden estimate or any other aspect of this collection of information, including suggestions for reducing this burden to Washington Headquarters Services, Directorate for Information Operations and Reports, 1215 Jefferson Davis Highway, Suite 1204, Arlington, VA 22202-4302, and to the Office of Management and Budget, Paperwork Reduction Project (0704-0188), Washington, DC 20503. 1 . AGENCY USE ONLY (Leave blank) 2. REPORT DATE 3. REPORT TYPE AND DATES COVERED July 2002 Final 4. TITLE AND SUBTITLE 5. FUNDING NUMBERS Record of Decision for Harmon Annex Operable Unit, F-41 624-00-D-8052-003 Andersen Air Force Base, Guam Delivery Order 03 6. AUTHOR(S) Michael Bone, P.E. (Foster Wheeler Environmental Corporation) Toraj Ghofrani, P.E. (EA Engineering, Science, & Technology, Inc.) 7. PERFORMING ORGANIZATION NAME(S) AND ADDRESS(ES) 8. PERFORMING ORGANIZATION REPORT NUMBER Foster Wheeler Environmental Corporation 43 Union Blvd., Suite 1010, Lakewood, CO 80228-1829 N/A EA Engineering, Science, & Technology, Inc. P.O. Box 4355, Andersen AFB, Yigo, Guam 96929-4355 9. SPONSORING/MONITORING AGENCY NAME(S) AND ADDRESS(ES) 10. SPONSORING/MONITORING Air Force Center for Environmental Excellence AGENCY REPORT NUMBER HQAFCEE/ERD N/A 3207 North Road, Bldg. 532 Brooks Air Force Base, Texas 78235-5363 11. SUPPLEMENTARY NOTES 12a. DISTRIBUTION/AVAILABILITY STATEMENT 12b. DISTRIBUTION CODE Approved for public release; distribution is unlimited. 13. ABSTRACT (Maximum 200 words) This Record of Decision presents the rationale behind a No Further Action decision for Installation Restoration Program (IRP) Site 18/Landfill 23, Site 19/Landfill 24, and Site 39/Harmon Substation located at Harmon Annex, Andersen Air Force Base, Guam. This Record of Decision summarizes the history, environmental background, extent of contamination, associated risks, implemented remedial alternatives, and the post-remedial status of the Harmon Annex Operable Unit. 14. SUBJECT TERMS 15. NUMBER OF PAGES Andersen AFB - Human Health Risk Assessment Remedial Investigation - Ecological Risk Assessment No Further Action 16. PRICE CODE 17. SECURITY CLASSIFICATION 18. SECURITY CLASSIFICATION 19. SECURITY CLASSIFICATION 20. LIMITATION OF ABSTRACT OF REPORT OF THIS PAGE OF ABSTRACT Unclassified Unclassified Unclassified UL NSN 7540-01 -280-5500 Standard Form 298 (Rev 2-89) Prescribed by ANSI Std 239-18 USAF-223-R 298-102 CONTENTS Page LIST OF TABLES ii LIST OF FIGURES iii LIST OF ACRONYMS AND ABBREVIATIONS iv 1. DECLARATION 1-1 1.1 Site Name and Location 1-1 1.2 Statement of Basis and Purpose 1-1 1.3 Description of the Selected Remedy: No Further Action 1-1 1.4 Declaration Statement 1-1 1.5 Signature and Supported Agency Acceptance of the Remedy 1-2 2. DECISION SUMMARY 2-1 2.1 Site Name, Location, and Description 2-1 2.2 Site History and Enforcement Activities 2-4 2.3 Highlights of Community Participation 2-6 2.4 Scope and Role of the Operable Unit or Response Action 2-7 2.5 Site Characteristics 2-8 2.5.1 Sites 18, 19, and 39 Conceptual Model 2-9 2.5.2 Site 18 Contaminant Characteristics 2-9 2.5.3 Site 19 Contaminant Characteristics 2-10 2.5.4 Site 39 Contaminant Characteristics 2-12 2.6 Summary of Site Risks 2-14 2.6.1 Summary of Site 18 Risks 2-14 2.6.2 Summary of Site 19 Risks 2-15 2.6.3 Summary of Site 39 Risks 2-17 2.7 Description of No Further Action Alternative 2-21 2.7.1 No Further Action Alternative for Site 18 2-21 2.7.2 No Further Action Alternative for Site 19 2-21 2.7.3 No Further Action Alternative for Site 39 2-22 2.8 Explanation of Significant Changes 2-22 3. RESPONSIVENESS SUMMARY 3-1 4. REGULATORY COMMENTS AND AIR FORCE RESPONSES 4-1 5. REFERENCES R-l APPENDIX A Andersen Air Force Base Administrative Record Index APPENDIX B IRP Sites 19 and 39 Confirmation Sample Results (IT/OHM, 1999) APPENDIX C Human Health and Ecological Risk Assessments (IT/OHM, 1999) Final Record of Decision i July 2002 Harmon Annex Operable Unit LIST OF TABLES Table Follows No. Title Page No. 2-1 Surface Soil Analytical Results for IRP Site 18, Andersen AFB, Guam 2-8 2-2 Groundwater Analytical Results for Monitoring Well IRP-37, Near IRP Site 18, Andersen AFB, Guam 2-10 2-3 Surface Soil Analytical Results for IRP Site 19, Andersen AFB, Guam 2-10 2-4 Subsurface Soil Analytical Results for IRP Site 19, Andersen AFB, Guam 2-10 2-5 Subsurface Soil Dioxin Results for IRP Site 19, Andersen AFB, Guam 2-10 2-6 Groundwater Analytical Results for Monitoring Well IRP-38, Near IRP Site 19, Andersen AFB, Guam 2-12 2-7 Surface Soil Analytical Results for IRP Site 39, Andersen AFB, Guam 2-13 2-8 Subsurface Soil Analytical Results for IRP Site 39, Andersen AFB, Guam 2-13 2-9 Sludge Analytical Results for the Oil/Water Separator at IRP Site 39, Andersen AFB, Guam 2-13 2-10 Liquid and Floating Product Sample Results for the Oil/Water Separator at IRP Site 39, Andersen AFB, Guam 2-13 2-11 Surface Soil Dioxin Analytical Results at IRP Site 39, Andersen AFB, Guam 2-13 2-12 Subsurface Soil Dioxin Analytical Results for IRP Site 39, Andersen AFB, Guam 2-13 2-13 Groundwater Analytical Results for Monitoring Well IRP-36, Near IRP Site 39, Andersen AFB, Guam 2-14 2-14 Remedial Action at IRP Site 19, Andersen AFB, Guam 2-16 2-15 Remedial Action at IRP Site 39, Andersen AFB, Guam 2-19 2-16 Summary of Pertinent ARARs for IRP Site 19 and 39, Andersen AFB, Guam 2-22 Final Record of Decision ii July 2002 Harmon Annex Operable Unit LIST OF FIGURES Figure Follows No. Title Page No. 2-1 Location Map of Guam 2-1 2-2 Location Map of Andersen Air Force Base on Guam 2-1 2-3 Location Map of Harmon Annex Including IRP Sites 18,19, and 39 at Andersen AFB, Guam 2-1 2-4 Location of IRP Site 18/Landfill 23 at Harmon Annex, Andersen AFB, I Guam 2-1 2-5 Location of IRP Site 19/Landfill 24, Parcels A, B, and C at Harmon Annex, Andersen AFB, Guam 2-1 2-6 Location of IRP Site 39/Harmon Substation at Harmon Annex, Andersen AFB, Guam 2-1 2-7 Natural Habitats of IRP Site 18, Andersen AFB, Guam 2-2 2-8 Natural Habitats of IRP Site 19/Landfill 24, Parcels A, B, and C, Andersen AFB, Guam 2-2 2-9 Natural Habitats of IRP Site 39/Harmon Substation, Andersen AFB, Guam 2-3 2-10 Detailed Site Inventory Results at IRP Site 18, Andersen AFB, Guam 2-9 2-11 Soil Sample Locations and Results at IRP Site 18, Andersen AFB, Guam 2-9 2-12 Detailed Site Inventory Results at IRP Site 19/Landfill 24, Parcels A, B, and C, Andersen AFB, Guam 2-10 2-13 Surface Soil Sample Locations and Results at IRP Site 19/Landfill 24, Parcels A, B, and C, Andersen AFB, Guam 2-10 2-14 Subsurface Soil Sample Locations and Results at IRP Site 19/Landfill 24, Parcels A, B, and C, Andersen AFB, Guam 2-10 2-15 Detailed Site Inventory Results at IRP Site 39/Harmon Substation, Andersen AFB, Guam 2-12 2-16 Surface Soil Sample Locations and Results at IRP Site 39/Harmon Substation, Andersen AFB, Guam 2-13 2-17 Subsurface Soil Sample Locations and Results at IRP Site 39/Harmon Substation, Andersen AFB, Guam 2-13 2-18 Proposed Remediation Sites at IRP Site 19/Landfill 24, Parcels A, B, and C, Andersen AFB, Guam 2-15 2-19 Remediated Areas at IRP Site 19/Landfill 24, Parcels A, and C, Andersen AFB, Guam 2-16 2-20 Proposed Remediation Sites at IRP Site 39/Harmon Substation, Andersen Air Force Base on Guam 2-17 2-21 Remediated Areas at IRP Site 39/Harmon Substation, Andersen AFB, Guam 2-18 Final Record of Decision iii July 2002 Harmon Annex Operable Unit LIST OF ACRONYMS AND ABBREVIATIONS AFB Air Force Base AOC Area of Concern ARARs Applicable or Relevant and Appropriate Requirements bgs below ground surface BTVs Background Threshold Values CERCLA Comprehensive Environmental Response, Compensation, and Liability Act of 1980 CERCLIS Comprehensive Environmental Response, Compensation, and Liability Information System CFR Code of Federal Regulations COC Constituent of Concern COPC Constituent of Potential Concern CSM Conceptual Site Model CRP Community Relations Plan CY Cubic Yards DAWR Department of Aquatic and Wildlife Resources DSI Detailed Site Inventory EA EA Engineering, Science, and Technology, Inc. EBS Environmental Baseline Survey EOD Explosive Ordnance Disposal /F degrees Fahrenheit ft feet FFA Federal Facility Agreement GEPA Guam Environmental Protection Agency GovGuam Government of Guam GSA General Services Administration GWA Guam Waterworks Authority HSWA Hazardous and Solid Waste Act of 1982 ICF ICF Technology, Inc.