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Final Release LLNL Site 300 (USDOE) am] concerned about threats to life on Earth from nuclear weapons development at Lawrence Livermore." Response: Site 300 operations have involved the use of several radionuclides including tritium (3H) and uranium " 23'U and 238 238 ( U). Depleted uranium ( U) was used in certain experiments at Site 300 because it has similar properties and behavior as fissionable materials without the potential risks. Environmental releases of uranium have occurred in the EFA/WFA study area in the vicinity of the firing tables. However, measured activities of 234U and 238U in the EFA/WFA study area are only marginally above background levels. Uranium contamination is confined to the immediate vicinity of the release sites and has never been detected above background levels in any off-site well. Prior to 1990, tritium (3H)was used in explosives testing in the EFA/WFA study area and was concentrated in the gravels near the firing tables. This gravel was often sprayed, or"washed down"with water to control airborne dust. Eventually, contaminated gravel was disposed of in several pits around the Pit 7 Complex and in the Building 850 sand pile. The washing of the firing tables, and an elevated water table during a particularly heavy period of precipitation in 1982-1983, contributed to the mobilization of tritium into the groundwater. Currently, there are three commingling tritium plumes in the EFA/WFA study area. These plumes extend northeast and southeast along the Doall and Elk Ravines,respectively. Remediation practices, including source elimination, groundwater extraction, and monitored natural attenuation, are currently being utilized to prevent further contamination and to mitigate contaminant migration. Please refer to the Final Proposed Plan for Environmental Cleanup (LLNL 2000) for a detailed description of each of the remedial techniques. A tritium plume emanating from the Pit 6 landfill also exists; however, the measured activities are well below the state and federal drinking water standards. Tritium has not been detected in any off-site monitor or water-supply wells. This PHA concludes that potential past, current, and estimated future off-site exposures to radionuclides are below levels of public health concern. ATSDR does not have medical records of employees of LLNL or residents of the Bay Area. For worker safety issues,please contact the National Institute of Occupational Safety and Health (NIOSH) and, for local health statistics, contact your local health department. VOCs in Groundwater: Comment: A citizen was generally concerned about the TCE plume that originated at the General Services Area of Site 300: "Groundwater a toxic stew and in the past VOCs leaking out of pipes." Response: Please see"Groundwater"under the `Environmental Contamination and Pathways Analysis" section of this document. A-2