Record of Decision (Rods)
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Whiteman Air Force Base Environmental Restoration Program Final Final Record of Decision Decision for Southwest Ramp Expansion Area Sites FT-02, LF-11, LF-12, and SS-44 USAF Contract No. F41624-03-D-8595 Project No. YWHG2005-7020/7020A Task Order 0220 Prepared for Whiteman Air Force Base Missouri April 2005 Environmental Restoration Program Remedial Investigation for Whiteman Air Force Base Record of Decision Sites FT-02, LF-11, LF-12, and SS-44 April 2005 Prepared for 509 CES/CEVR, Whiteman Air Force Base, Missouri and HQ ACC/CEVR, Langley Air Force Base, Virginia Prepared by CH2MHILL 727 North First Street, Suite 400 St. Louis, Missouri 63102 USAF Contract No. F41624-03-D-8595 Project No. YWHG2005-7020/7020A Task Order 0220 Copyright 2005 by CH2M HILL, Inc. Reproduction and distribution in whole or in part beyond the intended scope of the contract without the written consent of CH2M HILL, Inc. is prohibited. Contents Acronyms and Abbreviations ..........................................................................................................v 1. Declaration Summary ..............................................................................................................1-1 1.1 Site Name and Location ..........................................................................................1-1 1.2 Statement of Basis and Purpose .............................................................................1-1 1.3 Assessment of the Site .............................................................................................1-2 1.4 Description of Selected Remedy ............................................................................1-2 1.4.1 Sites FT-02, LF-12, and SS-44.......................................................................1-3 1.4.2 Site LF-11........................................................................................................1-4 1.5 Statutory Determinations........................................................................................1-5 1.6 ROD Data Certification Checklist..........................................................................1-6 1.7 Authorizing Signatures ...........................................................................................1-6 2. 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 Site FT-02........................................................................................................2-2 2.2.2 Site LF-11........................................................................................................2-2 2.2.3 Site LF-12........................................................................................................2-3 2.2.4 Site SS-44 ........................................................................................................2-4 2.3 Community Participation .......................................................................................2-4 2.4 Scope and Role of Response Action ......................................................................2-5 2.4.1 Sites FT-02, LF-12, SS-44 ..............................................................................2-5 2.4.2 Site LF-11........................................................................................................2-5 2.5 Site Characteristics...................................................................................................2-5 2.5.1 Geology ..........................................................................................................2-6 2.5.2 Hydrogeology ...............................................................................................2-6 2.5.3 Surface Water ................................................................................................2-7 2.5.4 Nature and Extent of Contamination ........................................................2-7 2.5.5 Fate and Transport of Contaminants.......................................................2-10 2.5.6 Conceptual Site Model...............................................................................2-11 2.6 Current and Potential Future Land and Resource Uses...................................2-13 2.6.1 Land Use ......................................................................................................2-13 2.6.2 Surface Water Resources ...........................................................................2-13 2.6.3 Groundwater Resources ............................................................................2-13 2.7 Summary of Human Health Risks.......................................................................2-13 2.8 Summary of Ecological Risks ...............................................................................2-14 2.9 Basis for Action.......................................................................................................2-14 2.10 Remedial Action Objectives..................................................................................2-14 2.10.1 Sites FT-02 and LF-12 .................................................................................2-15 2.10.2 Site SS-44 ......................................................................................................2-15 2.10.3 Site LF-11......................................................................................................2-15 2.10.4 Remediation Goals .....................................................................................2-15 MKE\052210002 III Whiteman Air Force Base ROD April 2005 RECORD OF DECISION 2.11 Description of Alternatives .................................................................................. 2-15 2.11.1 Sites FT-02, LF-12, and SS-44 .................................................................... 2-16 2.11.2 Site LF-11 ..................................................................................................... 2-17 2.12 Comparative Analysis of Alternatives ............................................................... 2-17 2.12.1 Sites FT-02, LF-12, and SS-44 .................................................................... 2-18 2.12.2 Site LF-11 ..................................................................................................... 2-20 2.13 Principal Threat Waste.......................................................................................... 2-20 2.14 Selected Remedy and Performance Measures................................................... 2-20 2.14.1 Remedy for Sites FT-02, LF-12, and SS-44: ICs (Supported by Groundwater Monitoring)..................................................................... 2-21 2.14.2 Remedy for Site LF-11: ICs........................................................................ 2-22 2.14.3 Additional Performance Measures to Maintain, Monitor, and Report on ICs for Sites FT-02, LF-11, LF-12, and SS-44...................... 2-22 2.14.4 Five-Year Review ....................................................................................... 2-23 2.15 Statutory Determinations ..................................................................................... 2-24 2.16 Documentation of Significant Changes.............................................................. 2-24 3. Responsiveness Summary ...................................................................................................... 3-1 3.1 Stakeholder Comments and Lead Agency Responses ....................................... 3-1 3.2 Technical and Legal Issues..................................................................................... 3-1 4. References.................................................................................................................................. 4-1 Appendixes A Applicable or Relevant and Appropriate Requirements B Cost Estimates for Monitoring, Sites FT-02, LF-12, and SF-44 C Cost Estimates for Monitoring and Site Improvements, Site LF-11 Table 2-1 Summary of Site Contaminants ........................................................................................ 2-8 Figures 2-1 Base Location Map 2-2 Site Location Map 2-3 Site Features Map 2-4 Site FT-02 Chemicals Exceeding Screening Levels in Groundwater 2-5 Site LF-11 Chemicals Exceeding Screening Levels in Soil and Groundwater 2-6 Site LF-12 Chemicals Exceeding Screening Levels in Soil and Groundwater 2-7 Site SS-44 Chemicals Exceeding Screening Levels in Groundwater 2-8 Institutional Control Boundaries for Sites FT-02, LF-12, and SS-44 2-9 Presumptive Remedy Boundaries for Site LF-11 Waste Trenches IV ROD Sites FT-02, LF-11, LF-12, and SS-44 April 2005 Acronyms and Abbreviations AFB Air Force Base AFCEE Air Force Center for Environmental Excellence ARARs Applicable or Relevant and Appropriate Requirements BEHP bis(2-ethylhexyl)phthalate CALM Cleanup Levels for Missouri CERCLA Comprehensive Environmental Response, Compensation, and Liability Act CFR Code of Federal Regulations COC chemical of concern COPC chemical of potential concern 1,2-DCA 1,2-dichloroethane 1,2-DCE 1,2-dichloroethene DPT direct-push technology ERP Environmental Restoration Program FPTA Fire Protection Training Area FS Feasibility Study ft/yr feet per year HHRA Human Health Risk Assessment HQ ACC/CEVR Headquarters Air Combat Command, Environmental