FFA Final Record of Decision for Site 10 Washington Navy Yard Washington, D.C. Naval Facilities Engineering Command Washington United States Environmental Protection Agency Region III District of Columbia Department of the Environment May 2009 Contents Acronyms and Abbreviations ..........................................................................................................v 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...........................................................................1-1 1.4 Statutory Determinations.............................................................................................1-2 1.5 Authorizing Signature..................................................................................................1-2 2 Decision Summary ................................................................................................................2-1 2.1 Site Name, Location, and Brief Description ..............................................................2-1 2.2 Site History, Previous Investigations, and Enforcement Activities.......................2-1 2.2.1 Site History .......................................................................................................2-1 2.2.2 Previous Investigations...................................................................................2-2 2.2.3 Enforcement Activities....................................................................................2-4 2.3 Community Participation ............................................................................................2-4 2.4 Scope and Role of the Response Action.....................................................................2-5 2.5 Site Characteristics........................................................................................................2-5 2.5.1 Site Overview ...................................................................................................2-5 2.5.2 Physical Setting ................................................................................................2-5 2.5.3 Ecology ..............................................................................................................2-6 2.5.4 Conceptual Site Model ....................................................................................2-6 2.5.5 Nature and Extent of Contamination............................................................2-6 2.6 Current and Potential Future Land and Resource Uses..........................................2-7 2.7 Summary of Risks .........................................................................................................2-7 2.7.1 Human Health Risk Assessment Process.....................................................2-8 2.7.2 Human Health Risk Assessment Results – Before Removal Action.........2-9 2.7.3 Human Health Risk Assessment Results – After Removal Action.........2-11 2.7.4 Ecological Risk Assessment Process............................................................2-11 2.7.5 Ecological Risk Assessment Results – Before Removal Action ...............2-12 2.7.6 Ecological Risk Assessment Results – After Removal Action .................2-13 2.8 Selected Remedy .........................................................................................................2-14 2.9 Documentation of Significant Changes ...................................................................2-14 3 Responsiveness Summary ...................................................................................................3-1 3.1 Overview........................................................................................................................3-1 3.2 Background on Community Involvement ................................................................3-1 3.3 Summary of Comments Received During the Public Comment Period, Navy Responses.......................................................................................................................3-1 4 References ...............................................................................................................................4-1 090540001WDC III FINAL-RECORD OF DECISION FOR SITE 10 Tables 2-1 Summary of RME Cancer Risks and Hazard Indices 2-2 Summary of CT Hazard Indices 2-3 Surface Soil Lead Model Results 2-4 Site 10 - ERA Step 3 Surface Soil Screening for Lead for Lower Trophic Level Receptors 2-5 Site 10 Quarters A - ERA Step 3 Surface Soil Screening for Lower Trophic Level Receptors 2-6 Site 10 Lawn Areas - ERA Step 3 Surface Soil Screening for Lower Trophic Level Receptors 2-7 Site 10 Garden Areas - ERA Step 3 Surface Soil Screening for Lower Trophic Level Receptors 2-8 Site 10 Spigot Areas - ERA Step 3 Surface Soil Screening for Lower Trophic Level Receptors 2-9 Summary of Hazard Quotients for Food Web Exposures For Site 10 2-10 Summary of Ecological Risk Assessment Step 3 COCs Figures 2-1 Washington Navy Yard Location Map 2-2 Washington Navy Yard Site Plan 2-3 Extent of Removal Actions for Site 10 2-4 Conceptual Site Model for Potential Human Exposure 2-5 Conceptual Site Model for Potential Ecological Exposure Appendixes A DDOE Letter of Concurrence B Site 10 Removal Action Confirmatory Soil Results C Public Meeting Transcript—September 10, 2008 IV 090540001WDC Acronyms and Abbreviations CERCLA Comprehensive Environmental Response, Compensation, and Liability Act CERCLIS ID Comprehensive Environmental Response, Compensation, and Liability Act Information System Identification COPC constituent of potential concern CSF cancer slope factor CTE central tendency exposure CSM conceptual site model DDOE District of Columbia Department of the Environment EPA United States Environmental Protection Agency EPC exposure point concentration ERA Ecological Risk Assessment FFA Federal Facilities Agreement FS Feasibility Study HEAST Health Effects Assessment Summary Tables HHRA human health risk assessment HI hazard index HQ hazard quotient IC Institutional Control IEUBK Integrated Exposure Uptake Biokinetic Model IR Installation Restoration IRIS Integrated Risk Information System LOAEL lowest observed adverse effect level Navy United States Department of the Navy NCP National Oil and Hazardous Substances Pollution Contingency Plan NOAEL no observed adverse effect level NPL National Priorities List PA Preliminary Assessment ppm parts per million RAB Restoration Advisory Board RBC risk-based concentration RCRA Resource Conservation and Recovery Act RfD reference dose RFI RCRA Facility Investigation RI Remedial Investigation RME reasonable maximum exposure ROD Record of Decision 090540001WDC V FINAL-RECORD OF DECISION FOR SITE 10 SARA Superfund Amendments and Reauthorization Act SEFC Southeast Federal Center SERA Screening Ecological Risk Assessment SSA 12 Site Screening Area 12 SVOC semi-volatile organic compound UCL upper confidence limit VOC volatile organic compound WNY Washington Navy Yard VI 090540001WDC SECTION 1 Declaration 1.1 Site Name and Location This Record of Decision (ROD) was prepared for the soil at Site 10 at the Washington Navy Yard (WNY) in Washington, D.C. By definition, this site consists solely of soil; basewide groundwater is addressed as a separate operable unit. The Comprehensive Environmental Response, Compensation, and Liability Act Information System identification (CERCLIS ID) number for the WNY is DC9170024310. 1.2 Statement of Basis and Purpose This ROD presents the basis for determining that further remedial action is not necessary for Site 10 at the WNY. The determination has been made in accordance with the Comprehensive Environmental Response, Compensation, and Liability Act of 1980 (CERCLA), as amended by the Superfund Amendments and Reauthorization Act of 1986 (SARA), and, to the extent practicable, the National Oil and Hazardous Substances Pollution Contingency Plan (NCP). In accordance with Section 113(k) of CERCLA, this decision is based on the Administrative Record file for the WNY. The United States Department of the Navy (Navy) and the United States Environmental Protection Agency (EPA) Region III jointly issue this ROD. The District of Columbia Department of the Environment (DDOE) concurs with the selected remedy (see Appendix A). Public comments that were received during the public meeting and 30-day comment period on the Proposed Plan for this site are discussed in Section 3, “Responsiveness Summary.” 1.3 Description of the Selected Remedy No further CERCLA remedial action is the selected remedy for the soil at Site 10. The no­ further-action remedy selection is based on the remedial investigations (including the baseline human health and ecological risk assessment), the subsequent non-time-critical removal action (NTCRA) of over 2,000 cubic yards of soil, and the results of 313 confirmatory soil samples. No further action under CERCLA is necessary to protect human health, welfare, or the environment from actual or threatened releases of hazardous substances into the environment from the soil at Site 10. Because this remedy will not result in hazardous substances, pollutants, or contaminants remaining on-site above levels that allow for unlimited use and unrestricted