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Final Release LLNL Site 300 (USDOE) center—approximately 2 miles from the city boundary. Site 300 covers 11.8 mit and lies mostly in San Joaquin County, with approximately one-sixth of the western portion in Alameda County. Site 300 ranges in elevation from 500 feet above sea level in the southeast to about 1750 feet in the northwest. The climate is arid, with an average annual rainfall of 10.44 inches (1964-1997), and windy, typically from the west-southwest (LLNL 1999). The site generally experiences mild, rainy winters and warm, dry summers. The mean temperature for Site 300 in 2001 was 15°C (59°F), with a temperature range from-5°C (23°F) to 40°C (104°F). For the purposes of the Site-Wide Remedial Investigation (SWRI), LLNL subdivided Site 300 into six study areas (SA) based on the process and operations in each. The six study areas are: 1. Building 833, 2. Building 834, 3. East Firing Area/West Firing Area (EFA/WFA), 4. Pit 6 Area, 5. High Explosives (HE) Process Area, and 6. General Services Area (GSA). A summary description of each SA and processes within them is presented in Table 1. Table 1:Site 300 Study Areas and the Processes in Each Study Area Past/Current Processes GSA Administrative and support services for Site 300,the motor pool,vehicle repair, painting and maintenance, as well as chemical storage were located in this study area. Building 834 Thermal physical, environmental and dynamic materials testing including thermal shock, thermal cycling and exposure to long-term temperature extremes.TCE was used as a heat-transfer fluid. Pit 6 Area From 1964 to 1973,the pit 6 landfill was used to dispose of various wastes including: empty drums,capacitors, gas cylinders,depleted uranium, animal carcasses,other biological waste and miscellaneous building debris. Some of the debris came from the LLNL Livermore Site and LBNL.There is also a Small Firearms Training Facility along the south edge of the study area. HE Process Area Support facilities related to chemical formulation,fabrication, mechanical pressing, machining, and testing of shaped explosives and detonation devices. 2