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Final Release LLNL Site 300 (USDOE) Study Area Past/Current Processes EFA/WFA Explosives experiments were conducted to develop detonation methods for nuclear weapons. Laser and particle-beam experiments were also conducted. Tritium, uranium, and beryllium contaminated gravels from the firing tables were disposed of in landfills in this area. This area includes landfill pits 1, 2, 3, 4, 5, 7, 8, and 9. Building 830,833, and From 1959 to 1982, Buildings 833 and 830 were used to test the physical properties of 836 explosives, but are now used for storage. Building 836,the Dynamic Test Complex, is used to test for the effects of vibration and shock on equipment. Fifty-seven contaminant release areas affecting surface soil, subsurface soil, surface water, or groundwater have been identified at Site 300. Figure 2 shows these release areas. Note that all fifty-seven release areas are not identified in Figure 2 because there are multiple releases at a given area. The primary contaminants are volatile organic compounds (VOCs), HE compounds HMX and RDX, and tritium. Uranium-238, nitrate, and perchlorate were also found. VOCs— primarily trichloroethylene (TCE)—were found in groundwater at all six study areas, with the highest concentrations in the Building 833, Building 834, HE Process Area, and the GSA study areas. HE compounds were detected in groundwater in the southeastern portion of Site 300 (HE Process Area). Groundwater contamination in the EFA/WFA is primarily tritium, and uranium- 238. Tritium and uranium-238 are the only radionuclides confirmed as groundwater contaminants. Most of the contamination has remained within the site boundary, with the exception of two TCE plumes from the GSA. The TCE plume emanating from the eastern GSA historically extended over a mile along the Corral Hollow stream bed. The TCE plume emanating from the central GSA extends approximately 200 feet off site at concentrations approaching 80 ppb in off-site monitoring wells. Remediation of the plume source is ongoing. Off-site drinking water wells are currently unaffected by the Site 300 contamination. A similar subdivision of Site 300 was made for the Site-Wide Feasibility Study(SWFS). However, the SWFS delineation was based on groupings of similar and relatively proximal release sites and any associated environmental contamination. Eight operable units (OU)were defined: 1. (OU-1) General Services Area, 2. (OU-2) Building 834, 3. (OU-3) Pit 6, 4. (OU-4) HE Process Area, 5. (OU-5) Building 850/Pits 3 & 5, 6. (OU-6) Building 854, 7. (OU-7) Building 832 Canyon, and 8. (OU-8) Site 300, 3