For IRP Sites 10, 13, 15, 26, & 27, W/Appendices AC
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SEMS-RM DOCID # 1166269 THE UNITED STATES NAVY INSTALLATION RESTORATION PROGRAM FINAL RECORD OF DECISION FOR INSTALLATION RESTORATION PROGRAM SITES 10, 13, 15, 26, AND 27 ANDERSEN AIR FORCE BASE, GUAM January 2011 THE UNITED STATES NAVY INSTALLATION RESTORATION PROGRAM FINAL RECORD OF DECISION FOR INSTALLATION RESTORATION PROGRAM SITES 10, 13, 15, 26, AND 27 ANDERSEN AIR FORCE BASE, GUAM January 2011 Table of Contents Contents .................................................................................................................................. iii Acronyms ................................................................................................................................. v 1.0 Declaration .................................................................................................................... 1-1 1.1 Site Name and Location ................................................................................... 1-1 1.2 Statement of Basis and Purpose ........................................................................ 1-1 1.3 Selected Remedy and Statutory Determinations .............................................. 1-2 1.4 Authorizing Signatures ..................................................................................... 1-3 1.4.1 U.S. Navy .......................................................................................................... 1-3 1.4.2 U.S. Environmental Protection Agency ............................................................ 1-5 1.4.3 Guam Environmental Protection Agency ......................................................... 1-7 2.0 Decision Summary ........................................................................................................ 2-1 2.1 Site Name, Location, and Description .............................................................. 2-1 2.2 Site History and Enforcement Activities .......................................................... 2-2 2.2.1 Base Operational History .................................................................................. 2-2 2.2.2 Site 10 History ................................................................................................ 2-19 2.2.3 Site 13 History ................................................................................................ 2-19 2.2.4 Site 15 History ................................................................................................ 2-19 2.2.5 Site 26 History ................................................................................................ 2-20 2.2.6 Site 27 History ................................................................................................ 2-20 2.2.7 Previous Investigations and Response Actions .............................................. 2-20 2.2.8 Enforcement Activities ................................................................................... 2-46 2.3 Community Participation ................................................................................ 2-46 2.4 Scope and Role of Operable Unit or Response Action .................................. 2-50 2.5 Site Characteristics ......................................................................................... 2-51 2.5.1 Physiography and Climate .............................................................................. 2-51 2.5.2 Geology ........................................................................................................... 2-51 2.5.3 Hydrogeology ................................................................................................. 2-52 2.5.4 Ecology ........................................................................................................... 2-53 2.5.5 Nature and Extent of Contamination .............................................................. 2-54 2.6 Current and Potential Future Land and Resource Uses .................................. 2-67 2.6.1 Land Use ......................................................................................................... 2-67 2.6.2 Groundwater and Surface Water Uses ............................................................ 2-69 2.7 Summary of Site Risks ................................................................................... 2-70 2.7.1 Summary of Human Health Risk Assessment ................................................ 2-70 2.7.2 Summary of Ecological Risk Assessment ...................................................... 2-98 2.8 Documentation of Significant Changes ........................................................ 2-105 3.0 Responsiveness Summary ............................................................................................ 3-1 3.1 Stakeholder Comments and Lead Agency Responses ...................................... 3-1 3.2 Technical and Legal Issues ............................................................................... 3-1 4.0 References ..................................................................................................................... 4-1 Final NFA ROD, IRP Sites 10, 13, 15, 26, and 27 iii Andersen AFB, Guam January 2011 Tables 2-1 Public Notification of Document Availability ........................................................... 2-49 2-2 Public Comment Period Requirements ...................................................................... 2-49 2-3 Exposure Point Concentrations for COCs Detected at Sites 10, 13, 15, 26, and 27 .. 2-72 2-4 Carcinogenic Toxicity Information for the Ingestion, Dermal Pathway ................... 2-81 2-5 Carcinogenic Toxicity Information for the Inhalation Pathway ................................ 2-82 2-6 Non-Cancer Toxicity Information for the Ingestion, Dermal Pathway ..................... 2-83 2-7 Non-Cancer Toxicity Information for the Inhalation Pathway .................................. 2-85 2-8 Summary of Incremental Lifetime Cancer Risks and Cumulative Non-Cancer Hazard Indices at the Seven Sites on Andersen AFB ................................................ 2-88 2-9 Assessment and Measurement Endpoints for Step 3a BERA Considerations for Sites 10, 13, 15, 26, and 27 ...................................................................................... 2-100 2-10 Tier 2 COPECs that Failed the Tier 2 LTL Screening Process ............................... 2-101 Figures 1 Location of Guam in the Pacific Ocean ....................................................................... 2-3 2 Andersen AFB Location Map ...................................................................................... 2-5 3 Site Location Map ........................................................................................................ 2-7 4 Location Map IRP Site 10............................................................................................ 2-9 5 Location Map IRP Site 13.......................................................................................... 2-11 6 Location Map of IRP Site 15 ..................................................................................... 2-13 7 Location Map of IRP Site 26 ..................................................................................... 2-15 8 Location Map IRP Site 27.......................................................................................... 2-17 9 Site 10 Sampling Locations ....................................................................................... 2-23 10 Excavation Boundaries and Soil Confirmation Sampling Locations IRP Site 10 ..... 2-25 11 Sampling Locations at Site 13 – Original Site ........................................................... 2-29 12 Sampling Locations at Site 13 – Expansion Site ....................................................... 2-31 13 Site 15 Sampling Locations ....................................................................................... 2-35 14 Site Excavation Boundaries, Site 15 Soil Removal Action ....................................... 2-37 15 Site 26 Sampling Locations ....................................................................................... 2-41 16 Site 27 Sampling Locations ....................................................................................... 2-47 17 Soil Sample Results Above Screening Levels, IRP Site 10 ....................................... 2-55 18 Soil Sample Results Above Screening Levels, IRP Site 13 (Original Site) .............. 2-57 19 Soil Sample Results Above Screening Levels, IRP Site 13 (Expansion Site) ........... 2-59 20 Post-Removal Soil Sample Results Above Screening Levels at IRP Site 15 ............ 2-63 21 Surface and Shallow Subsurface Soil Sample Results Above Screening Levels Locations at IRP Site 27 ............................................................................................ 2-65 22 Generalized Conceptual Site Model .......................................................................... 2-79 Appendices A Federal Facility Agreement Notice Letters B Responsiveness Summary and Response to Regulatory Comments C Risk Characterization Tables Final NFA ROD, IRP Sites 10, 13, 15, 26, and 27 iv Andersen AFB, Guam January 2011 Acronyms °F degree Fahrenheit µg/dL microgram per deciliter g/L microgram per liter % percent 36 ABW 36th Air Base Wing AFB Air Force Base AR Administrative Record AST aboveground storage tank BCO Base Commanding Officer BERA baseline ecological risk assessment BGP Base General Plan bgs below ground surface Bldg. Building BTV background threshold value Cal/EPA California Environmental Protection Agency