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Final Release LLNL Site 300 (USDOE) 1. the East Firing Area (EFA) syncline, which has a broad trough and dips gently to the northeast; 2. the Patterson anticline, the largest and most influential fold, runs east to west through the Western Firing Area (WFA) with slopes to the north and south; and 3. the HE Process Area syncline, which is oriented to the southeast (LLNL 1999). Groundwater also frequently occurs in perched aquifers under hilltops, usually in Quaternary landslide (Qls), terrace (Qt) and alluvial (Qal) deposits (LLNL 2002). The Site-Wide Feasibility Study(LLNL 1999), contains a complete and exhaustive description of the subsurface features of Site 300 and the surrounding area, and provides a thorough description of the hydrogeology of the Site, including groundwater flow direction. On the site, groundwater is primarily used for site-related activities such as fire suppression, cooling towers, and HE processing. Off the site, groundwater is used for dust suppression (SVRA), stock watering (Connolly, Gallo Ranches), and fire fighting (Castle Rock Fire Station). Bottled water is the primary source of drinking water both on and off site (LLNL 1999). Appendix D lists contaminants, contaminant sources, and media affected for each OU. Contamination is present in the Tnbsl regional aquifer in all operable units at Site 300, with the exception of the Building 834 operable unit. Only contaminated groundwater plumes that extend, or potentially could extend, off-site are discussed in this PHA. Site Visit and Collection of Community Concerns On January 10, 2000, at the Tracy Community Center, ATSDR both attended and set up a table at a DOE-sponsored workshop on Site 300. Approximately 10 community residents attended this meeting, and three persons discussed with an ATSDR representative their concerns about Site 300. The most recent formal site visit conducted by ATSDR staff was October 16, 2003. This site visit was conducted to gather relevant demographic and land-use data, and to investigate possible exposure pathways in the community near the site. On October 16, 2003, a public availability session was held at the Tracy Community Center in Tracy, CA to collect community concerns. This availability session was informal and allowed community members the opportunity to discuss their concerns one-on-one with an ATSDR team member. Nine community members attended the meeting. The concerns expressed dealt largely with the possible impact of groundwater contaminants on private residential wells. The presence of radiological contamination at Site 300 was also a concern. These and other issues are discussed throughout this PHA. All community concerns are addressed individually in Appendix A. Community concerns have also been collected through written correspondence. These comments and concerns have been added to Appendix A. 5