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Final Release LLNL Site 300 (USDOE) Summary Lawrence Livermore National Laboratory (LLNL) Site 300 is a Department of Energy(DOE) facility operated by the University of California. Site 300 is used as a high-explosives (HE) test facility in support of LLNL's Weapons Program Mission of research, development, and testing of non-nuclear components of nuclear weapons. Because of contaminants found in groundwater at Site 300 and the tonnage of material deposited in Site 300 landfills, Site 300 was added to the U.S. Environmental Protection Agency's (EPA's) Superfund National Priorities List(NPL) on August 30, 1990. In the past, Site 300 operated dry wells, waste water lagoons, and solid waste landfills which historically accepted site waste. One of the landfills also received some waste from the LLNL Livermore Main Site and from Lawrence Berkeley National Laboratory. Current operations at the site include measuring the physical properties of explosives, vibration and shock testing, thermal materials testing, laser and particle beam developmental experimentation, and physical processing (fabrication, mechanical pressing, and machining) of shaped explosives and detonation devices. LLNL Site 300 is in a rural area of north-central California. Private ranch land borders the site to the north and to the southeast. There is currently no residential development bordering Site 300, however,part of the Vieira Ranch along the north-east site perimeter is proposed for the Tracy Hills residential development. A private facility on the eastern border of Site 300 was previously used for explosives research and testing. This facility is currently leased by a fireworks company and used for assembly and storage. The California Department of Fish and Game has property which lies along the eastern boundary. Along most of the southern boundary of Site 300, across Tesla/Corral Hollow Road, is the Carnegie State Vehicular Recreation Area(CSVRA). Fifty-seven contaminant release areas (Figure 2) affecting surface soil, subsurface soil, surface water, or groundwater have been identified at Site 300. The primary contaminants are volatile organic compounds (VOCs), HE compounds HMX and RDX, and tritium. Uranium-238, nitrate, and perchlorate were also found, but in lower concentrations. With the exception of two TCE plumes from the General Services Area (GSA), most of the contamination has remained within the site boundary. The TCE plume emanating from the eastern GSA historically extended over a mile along the Corral Hollow stream bed. After 8 years of treatment, by the fall of 1999 this TCE plume (as defined by a 5-µg/L contour line)had been restricted to Site 300 property(LLNL 2002). The TCE plume emanating from the central GSA extends approximately 200 feet off site and, in monitoring wells, is found at concentrations approaching 80 ppb. Downgradient water supply wells are not currently affected by this plume; in fact, Site 300 contaminants have never been detected in off-site residential groundwater wells. The Agency for Toxic Substances and Disease Registry has concluded that there are no past or current exposures to contaminants associated with LLNL—Site 300, and the potential for future exposure is unlikely. Therefore, there is No Public Health Hazard to residents near the site. vii