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• 0 Facility Agreement (FFA) negotiated between the Department of Energy, the U.S. Environmental Protection Agency, the California Department of Toxic Substances Control, and the California Central Valley Regional Water Quality Control Board (CVRWQCB). The FFA was explained as it relates the LLNL Environmental Restoration Division (ERD) Building 834 area project to characterize and treat contamination in the shallow local perched aquifer. The August 1, 1994, discussion described evidence from the closure excavation that confirms suspicion that the tank was the source of the diesel fuel identified in W-834-D8 well water samples. A copy of the document describing the ERD project according to the FFA, "Draft Feasibility Study for the Building 834 Operable Unit, Lawrence Livermore National Laboratory Site 300" UCRL-AR- 113863 DR, February 1994, was forwarded to Diane Hinson as additional information. The "Final Feasibility Study for the Building 834 Operable Unit, Lawrence Livermore National Laboratory Site 300" UCRL-AR-113863 is now complete and is provided as Appendix H. These documents provide extensive description of the perched aquifer, contamination in the aquifer, and remedial action alternatives. The August 1, 1994, discussion with Diane Hinson resulted in agreement to proceed immediately with the completion of field work, provided Ms. Hinson received satisfactory understanding from Susan Timm of CVRWQCB regarding the regulatory oversight provided by CVRWQCB as a party to the FFA, and the Building 834 area project in particular. This understanding and the agreement to proceed with field work are recorded in the San Joaquin County Public Health Services letter "LLNL - Site 300, UST Removals - Bldgs #834 and 871", Diane Hinson of the Site Mitigation Unit to Richard Henry, August 4, 1994 (Appendix I). The agreement to complete field work is explained in detail in our letter "Soil Vapor Monitor Point Installation at the Building 834 Complex, Lawrence Livermore National Laboratory Site 300", Albert Lamarre of the LLNL Environmental Restoration Division to Diane Hinson, August 3, 1994 (Appendix J). Field work proceeded and was completed as follows: On August 11, 1994, the excavation was filled with clean compacted clayey soil. Three vadose zone monitoring wells intended for future use were installed in the fill. With the completion of the fill, the excavation was restored to grade with asphalt. This is the final report of corrective action at the Building 834 underground tank closure site. - 8 -