Record of Decision (Rods)
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U.S. Department of Energy Livermore Site Office, Livermore, California 94551 Lawrence Livermore National Laboratory Lawrence Livermore National Security, LLC, Livermore, California 94551 UCRL-AR-236665 Site-Wide Record of Decision Lawrence Livermore National Laboratory Site 300 July 2008 Environmental Restoration Department This work performed under the auspices of the U. S. Department of Energy by Livermore National Laboratory under Contract DE-AC52-07NA27344. UCRL-AR-236665 Site-Wide Record of Decision Lawrence Livermore National Laboratory Site 300 July 2008 Environmental Re storation Department UCRL-AR-236665 Site-Wide ROD for LLNL Site 300 July 2008 Table of Contents 1. Declaration ...........................................................................................................................1-1 1.1. Site Name and Location ................................................................................................ 1-1 1.2. Statement of Basis and Purpose .................................................................................... 1-2 1.3. Assessment of the Site................................................................................................... 1-2 1.4. Description of the Selected Remedy ............................................................................. 1-2 1.5. Statutory Determinations............................................................................................... 1-3 1.6. National Environmental Policy Act (NEPA) Integration.............................................. 1-3 1.7. ROD Data Certification Checklist................................................................................. 1-4 1.8. Authorizing Signatures and Support Agency Acceptance ............................................ 1-6 2. Decision Summary...............................................................................................................2-1 2.1. Site Name, Location, and Description........................................................................... 2-1 2.2. Site History and Enforcement Activities....................................................................... 2-1 2.3. Community Participation............................................................................................... 2-2 2.4. Scope and Role of the Response Action........................................................................ 2-3 2.4.1. General Services Area OU (OU 1)........................................................................ 2-3 2.4.2. Building 834 OU (OU 2) ...................................................................................... 2-4 2.4.3. Pit 6 Landfill OU (OU 3) ...................................................................................... 2-4 2.4.4. HE Process Area OU (OU 4) ................................................................................ 2-5 2.4.5. Building 850/Pit 7 Complex OU (OU 5) .............................................................. 2-5 2.4.5.1. Building 850 Firing Table (OU 5).............................................................. 2-5 2.4.5.2. Pit 7 Complex (OU 5)................................................................................. 2-6 2.4.6. Building 854 OU (OU 6) ...................................................................................... 2-6 2.4.7. Building 832 Canyon OU (OU 7) ......................................................................... 2-7 2.4.8. Site-Wide OU (OU 8) ........................................................................................... 2-7 2.4.8.1. Building 801 and the Pit 8 Landfill (OU 8)................................................ 2-7 2.4.8.2. Building 833 (OU 8)................................................................................... 2-8 2.4.8.3. Building 845 Firing Table and Pit 9 Landfill (OU 8) ................................ 2-8 2.4.8.4. Building 851 Firing Table (OU 8).............................................................. 2-8 2.4.8.5. Pit 2 Landfill (OU 8) .................................................................................. 2-9 2.4.9. Building 812 OU (OU 9) ...................................................................................... 2-9 2.4.10. Building 865.......................................................................................................... 2-9 2.4.11 Sandia Test Site..................................................................................................... 2-9 2.4.12. CERCLA/RCRA Relationship.............................................................................. 2-9 i UCRL-AR-236665 Site-Wide ROD for LLNL Site 300 July 2008 2.5. Site Characteristics ...................................................................................................... 2-10 2.5.1. Physical Setting................................................................................................... 2-10 2.5.2. Geology............................................................................................................... 2-10 2.5.3. Hydrogeology...................................................................................................... 2-11 2.5.3.1. Surface Water ........................................................................................... 2-11 2.5.3.2. Ground Water........................................................................................... 2-11 2.5.4. Nature and Extent of Contamination................................................................... 2-13 2.5.4.1. Identification of Contaminants of Concern (COCs)................................. 2-13 2.5.4.2. Sources of Contamination ........................................................................ 2-15 2.5.4.3. Nature and Extent of Contamination in Soil and Rock ............................ 2-15 2.5.4.4. Nature and Extent of Contamination in Surface Water............................ 2-15 2.5.4.5. Nature and Extent of Contamination in Ground Water ........................... 2-15 2.6. Current and Potential Future Site and Resource Uses................................................. 2-17 2.6.1. Current Onsite Land Uses ................................................................................... 2-17 2.6.2. Reasonably Anticipated Future Onsite Land Use ............................................... 2-18 2.6.3. Current Offsite Land Use.................................................................................... 2-19 2.6.4. Reasonably Anticipated Future Offsite Land Use .............................................. 2-19 2.6.5. Current Ground and Surface Water Uses............................................................ 2-19 2.6.6. Potential Ground and Surface Water Uses.......................................................... 2-20 2.7. Summary of Site Risks ................................................................................................ 2-21 2.7.1. Basis for Action .................................................................................................. 2-21 2.7.2. Human Health Risks ........................................................................................... 2-21 2.7.2.1. Summary of Human Risks for the Building 834 OU (OU 2) .................... 2-23 2.7.2.2. Summary of Human Risks for the Pit 6 Landfill OU (OU 3).................... 2-23 2.7.2.3. Summary of Human Risks for the HE Process Area OU (OU 4) ............. 2-24 2.7.2.4. Summary of Human Risks for the Building 850 Firing Table (OU 5)...... 2-24 2.7.2.5. Summary of Human Risks for Pit 7 Complex (OU 5)............................... 2-25 2.7.2.6. Summary of Human Risks for the Building 854 OU (OU 6) .................... 2-25 2.7.2.7. Summary of Human Risks for the Building 832 Canyon OU (OU 7)....... 2-26 2.7.2.8. Summary of Human Risks for the Building 801 Dry Well and Pit 8 Landfill (OU 8) ................................................................................ 2-26 2.7.2.9. Summary of Human Risks for the Building 833 (OU 8)........................... 2-26 2.7.2.10. Summary of Human Risks for the Building 845 Firing Table and Pit 9 Landfill (OU 8) ................................................................................ 2-27 2.7.2.11. Summary of Human Risks for the Building 851 Firing Table (OU 8)...... 2-27 2.7.2.12. Summary of Human Risks for the Pit 2 Landfill (OU 8) .......................... 2-27 2.7.3. Ecological Hazard Assessment ........................................................................... 2-27 2.7.3.1. Summary of Ecological Hazards for the Building 834 OU (OU 2).......... 2-27 2.7.3.2. Summary of Ecological Hazards for the Pit 6 Landfill OU (OU 3)......... 2-28 2.7.3.3. Summary of Ecological Hazards for the HE Process Area OU (OU 4)... 2-28 2.7.3.4. Summary of Ecological Hazards for the Building 850 Firing Table (OU 5)....................................................................................................... 2-29 ii UCRL-AR-236665 Site-Wide ROD for LLNL Site 300 July 2008 2.7.3.5. Summary of Ecological Hazards for the Pit 7 Complex (OU 5) .............. 2-29 2.7.3.6. Summary of Ecological Hazards for the Building 854 OU (OU 6).......... 2-29 2.7.3.7. Summary of Ecological Hazards for the Building 832 Canyon OU (OU 7)....................................................................................................... 2-30 2.7.3.8. Summary of Ecological Hazards for the Building 801 Dry Well and Pit 8 Landfill (OU 8) ...............................................................................