EPA/ROD/R2006030001342 2006 EPA Superfund Record of Decision: WASHINGTON NAVY YARD EPA ID: DC9170024310 OU 06 WASHINGTON, DC 09/29/2006 FFA Final Record of Decision Site 5—Building 73 and Site 16—Former Mercury Removal Area 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 July 2006 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 Description........................................................................2-1 2.2 Site History, Enforcement Activities, and Previous Investigations...................................2-1 2.2.1 Site History .......................................................................................................2-1 2.2.2 Enforcement Activities....................................................................................2-2 2.2.3 Previous Investigations...................................................................................2-3 2.3 Community Participation ............................................................................................2-7 2.4 Scope and Role of the Response Action.....................................................................2-8 2.5 Site Characteristics........................................................................................................2-8 2.5.1 Physical Setting ................................................................................................2-8 2.5.2 Conceptual Site Model ....................................................................................2-9 2.5.3 Nature and Extent of Contamination............................................................2-9 2.6 Current and Potential Future Land and Resource Uses........................................2-10 2.7 Risk Summary .............................................................................................................2-11 2.7.1 Summary of Human Health Risk Assessment Process ............................2-11 2.7.2 Site 5 HHRA Results......................................................................................2-11 2.7.3 Site 16 HHRA Results....................................................................................2-18 2.7.4 Ecological Risks..............................................................................................2-23 2.8 Selected Remedy .........................................................................................................2-24 2.9 Documentation of Significant Changes ...................................................................2-24 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 5. Glossary ......................................................................................................................................5-1 WDC042670002.ZIP III RECORD OF DECISION, SITE 5—BUILDING 73 AND SITE 16 - FORMER MERCURY REMOVAL AREA Appendixes A DDOE Letter of Concurrence B Public Meeting Transcript—December 7, 2005 C Human Health Risk Assessment Tables – Initial Site 5 HHRA D Human Health Risk Assessment Tables – Initial Site 5 HHRA – Lead Evaluation E Human Health Risk Assessment Tables – Updated Site 5 HHRA – Lead Evaluation F Human Health Risk Assessment Tables – Initial Site 16 HHRA G Human Health Risk Assessment Tables – Updated Site 16 HHRA- Mercury Evaluation Figures (Figures are located at the end of each section.) 2-1 Facility Boundary and Locations of Sites 5 and 16 2-2 Site 5 Detailed Layout 2-3 Site 16 Detailed Layout 2-4 Site 5 Sample Locations and Concentrations of Lead 2-5 Site 16 Sample Locations and Concentrations of Mercury 2-6 Site 5 Conceptual Site Model for Potential Human Exposures 2-7 Site 16 Conceptual Site Model for Potential Human Exposures IV WDC042670002.ZIP Acronyms and Abbreviations ALM Adult Lead Model AOC Area of Concern bgs below ground surface BRAC Base Realignment and Closure CERCLA Comprehensive Environmental Response, Compensation, and Liability Act COC constituent of concern COPC constituent of potential concern CSF cancer slope factor CSM conceptual site model CTE central tendency exposure DDOE District of Columbia Department of the Environment DPT direct-push technology EPA United States Environmental Protection Agency EPC exposure point concentration FFA Federal Facilities Agreement FRI Final Remedial Investigation FS Feasibility Study HEAST Health Effects Assessment Summary Tables HHRA human health risk assessment HI hazard index HQ hazard quotient IEUBK Integrated Exposure Uptake Biokinetic Model IFI Initial Findings Investigation IR Installation Restoration IRIS Integrated Risk Information System LID Low Impact Development MCL Maximum Contaminant Level Navy United States Department of the Navy NCEA National Center for Environmental Assessment NCP National Oil and Hazardous Substances Pollution Contingency Plan NDW Naval District Washington NPL National Priorities List OSHA Occupational Safety and Health Administration PA Preliminary Assessment PAH polycyclic aromatic hydrocarbon WDC042670002.ZIP V RECORD OF DECISION, SITE 5—BUILDING 73 AND SITE 16 - FORMER MERCURY REMOVAL AREA PCB polychlorinated biphenyl PEL Permissible Exposure Limit RAB Restoration Advisory Board RAGS Risk Assessment Guidance for Superfund RBC risk-based concentration RfD reference dose RFI RCRA Facility Investigation RI Remedial Investigation RME reasonable maximum exposure ROD Record of Decision SA Site Assessment SARA Superfund Amendments and Reauthorization Act SEFC Southeast Federal Center SI Site Investigation SVOC semivolatile organic compound UCL upper confidence limit of the mean UST underground storage tank VOC volatile organic compound WNY Washington Navy Yard VI WDC042670002.ZIP SECTION 1 Declaration 1.1 Site Name and Location Site 5—Building 73 and Site 16—Former Mercury Removal Area Washington Navy Yard Washington, D.C. CERCLIS ID No. DC9170024310 1.2 Statement of Basis and Purpose This Record of Decision (ROD) presents the selected remedy for soil at Sites 5 and 16 at the Washington Navy Yard (WNY), Washington, D.C. The selected remedy was chosen 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). This decision is based on information contained in the Administrative Record file for the WNY. The Department of the Navy (Navy) and the United States Environmental Protection Agency (EPA) selected the remedy and the District of Columbia Department of the Environment (DDOE) concurs with the selected remedy. A letter from DDOE indicating concurrence with the selected remedy is provided in Appendix A. The decision contained in this document is based on information and analysis currently available as a result of a thorough investigation at these sites. The decision does not preclude further review of the sites should additional information be identified. 1.3 Description of the Selected Remedy No further action is the selected remedy for the soil at both Sites 5 and 16. The no further action remedy selection is based on the remedial investigations (including the baseline human health and ecological risk assessment) of soil at Sites 5 and 16, which indicate that there are no unacceptable risks based on current site conditions, even if future residential use is assumed. 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 Sites 5 and 16. Sites 5 and 16 are two of 15 sites at the WNY and are included in the Navy’s WNY Installation Restoration (IR) Program. Separate investigations