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Remedial Action Completion Report June 2008 Remediation of Soils and Dry Sediments at RVAAP 08-11 (LLs 1-4) Page 1-6 yards (Shaw 2005). Construction As-Built Drawings are presented in Appendix A and show the areas of soil at LLs 1-4 with concentrations that exceeded the applicable cleanup levels that required removal. *** FINAL***
Remedial Action Completion Report June 2008 Remediation of Soils and Dry Sediments at RVAAP 08-11 (LLs 1-4) Page 2-1 2.0 PROJECT DESCRIPTION 2.1 SUMMARY OF RECORD OF DECISION The Final Interim ROD (Shaw 2007a) prepared for the LLs 1-4 at the RVAAP documents the selected remedy (excavation and off-site disposal) for surface and subsurface soils and dry sediment. The selected remedy is a final remedy for contaminated soils and dry sediment at LLs 1-4. This remedy was chosen in accordance with the requirements of the Comprehensive Environmental Response, Compensation and Liability Act (CERCLA) of 1980, as amended, 42 U.S.C. § 9601-9675. The selected remedy was evaluated against two threshold criteria: 1. Overall protection of human health and the environment 2. Compliance with applicable or relevant and appropriate requirements (ARARs) The Remedial Action Objective (RAO) was developed by considering the COCs, associated media, potential exposure pathways and receptors, and ARARs. The RAO for surface and subsurface soils and dry sediment was to prevent ingestion, inhalation, or direct contact with COCs exceeding the identified cleanup goals. Excavation and off-site disposal, the selected remedy, was considered consistent with the planned future use of the AOCs for National Guard mounted training, no digging, and met the required threshold criteria. The selected remedy included the following components: • Excavation of discrete areas of contaminated surface and subsurface soils and dry sediment with concentrations of contaminants exceeding cleanup goals • Temporary on-site storage via stockpiling characterization • Off-site disposal of soils at a permitted landfill, and; as needed, disposal at a Toxic Substances Control Act (TSCA) and/or Resource Conservation and Recovery Act (RCRA) permitted landfill • Replacement of excavated material with clean backfill • Groundwater monitoring to ensure the remedy did not impact groundwater • Maintenance of building slabs 2.1.1 Remedial Action Objectives Clean-up goals are the maximum allowable concentrations which are protective of human health and the environment. Clean-up goals for surface and subsurface soils and dry sediment at LLs 1-4 were determined based on risk-based and site-specific considerations, including background concentrations, duration of reasonable maximum human exposures, and reasonably anticipated future land use (National Guard mounted training, no digging). Attainment of the RAO addressed potential risks to human and ecological receptors identified in the risk assessment through removal of surface and subsurface soil and dry sediment with concentrations of COCs *** FINAL***
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