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Final Release LLNL Site 300 (USDOE) Region IX, State of California Department of Toxic Substances Control (DTSC), and the State of California Regional Water Quality Control Board (RWQCB)—Central Valley. These agencies receive summary tables of all quarterly analytical reports received from contract analytical laboratories. ATSDR evaluation included the identification of inconsistencies and data gaps. The validity of analyses and conclusions drawn in this PHA are based on the reliability of the information referenced in reports related to LLNL Site 300. In our assessment, the quality of environmental data available in these documents is sufficient for public health decisions. Public Health Implications ATSDR scientists have determined that there are no completed exposure pathways for any media around Site 300. The only confirmed contamination to have migrated off site was from two TCE- contaminated groundwater plumes originating in the GSA. Because there are two water supply wells located downgradient from contaminant plumes in the GSA, ATSDR scientists have classified future exposures to these plumes as potentially completed. LLNL samples these wells monthly. No contamination from Site 300 has been detected in these, or any other, off-site water- supply wells. Current exposure to contaminated groundwater from the central GSA has also been classified as potentially completed based on the fact that the off-site plume is still above drinking water standards. However, available data shows that the central GSA plume is shrinking. ATSDR scientists have concluded that current and future exposure to these plumes is unlikely. The closest city to Site 300 is Tracy, CA, which is 9 miles to the northeast. The aquifer from which the town of Tracy pumps its water is not hydrologically connected to any of the contaminated aquifers under Site 300. Data from air monitoring around the site has been characterized as in the background range for radioactivity and beryllium. Surface water run-off from Site 300 is only intermittent, and access to the site is restricted. For these reasons,ATSDR scientists have determined that contamination emanating from Site 300 results in no public health implications. Conclusions 1. Lawrence Livermore National Laboratory–Site 300 poses no public health hazard from currently known site-related contaminants. Such contaminants are subject to an ongoing CERCLA cleanup. It is unlikely that anyone can come into contact with the contaminants identified in surface soil or groundwater. 2. Available environmental data and current land use indicate that no one is exposed,has been exposed, or is about to be exposed to Site 300 contaminants at levels of health concern. 3. While contaminants such as uranium 238,tritium, and perchlorate have been detected in groundwater within the Site 300 boundaries, it is important to point out that none of these contaminants have been detected at levels above background in any off-site media. Because site related contaminants are subject to an ongoing CERCLA cleanup, and access to Site 300 is restricted, it is unlikely that residents of the Tracy area, the Site 300 area, or visitors to the CSVRA will be exposed to these substances. 19