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Presently, the RWQCB oversees all investigations and clean-up efforts relating to the trichloroethylene (TCE) and its degradation products, and tritium contamination which have been found to come from other pits. There is no evidence that this contamination is coming from either Pits 1 or 7. I. FACILITY DESCRIPTION AND LOCATION LLNL-Site 300 is owned by the Federal Government and is operated by the University of California (UC). Site 300 is located in the counties of Alameda and San Joaquin. It occupies 11 square miles of steep hills and rugged canyons with rolling hills and benches on its southern portion. The site is located about 15 miles southeast of Livermore and 8.5 miles southwest of Tracy (shown in Figure 1). Site 300 operations consist of hydrodynamic testing of non-nuclear high explosives; charged particle beam research; physical, environmental and dynamic testing; and high explosives formulation and fabrication. These operations are located at different areas: the West and East Firing Area; the General Service Area (GSA); Process Area; Chemistry Area; and Environmental Test Area. Specifically, LLNL is closing two hazardous waste landfills (Pits 1 and 7) (shown in Figure 2). Pit 7 is located in the Pit 7 complex at the West Firing Area about 2500 feet east of the property boundary. The Pit 7 complex has three other landfills (Pits 3, 4 and 5) which are inactive and in which a groundwater investigation is being conducted under the oversight of the RWQCB. Pit 1 is located in the East Firing Area about 2700 feet south of the property boundary. DHS issued an Interim Status Document (ISD) to Site 300 on March 30, 1981 which authorized them to continue to operate its existing hazardous waste units including Pits 1 and 7. However, on June 30, 1988, Site 300 withdrew its application to operate the two landfills. This resulted in EPA's and DHS' decisions to terminate the ISD for the operation of Pits 1 and 7. As required, Pits 1 and 7 ceased to receive waste or operate on November 8, 1988. II. PIT 1 DESCRIPTION Pit 1, located in the East Firing Area, is about 11,800 square yards or about two -and -a -half acres with a total volume of approximately 58,964 cubic yards of mixed wastes. Cover material was applied to the landfill every time there was a change of gravel at the firing table and just prior to the onset of the rainy season. This means that the specified volume of mixed waste above also consists of copious amount of clean fill soil. The facility started operating in 1961 and ceased to operate on November 1988. Solid wastes generated from the hydrodynamic test of non-nuclear explosives were disposed here and to other landfills on-site. The wastes consist of contaminated gravel and rubble (wood, cardboard, packaging, scrap metal) produced by detonation of test assemblies on gravel -covered firing tables.