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Lawrence Livermore National Laboratory <br /> February 28, 1991 <br /> Dear Community Member: <br /> In March of this year, Lawrence Livermore National Laboratory(LLNL) <br /> will begin a new clean-up program at Site 300, a LLNL testing site located <br /> outside of Tracy. LLNL has been investigating potential soil and ground <br /> water contamination at Site 300 since 1982. In August of last year, the site <br /> was included on the list of nationwide sites to be cleaned up under the federal <br /> Superfund program. This upcoming work on one portion of the site is part of <br /> LLNL's overall plan to clean up ground water and sail contamination at Site <br /> 300. Investigation and/or cleanup activities are also underway at seven other <br /> areas of the site. <br /> What's Included in the Cleanug. and Why <br /> This phase of the project (called a "removal action") will remove chemicals <br /> from ground water in the eastern General Services Area (GSA) of the site and <br /> surrounding offsite areas (see map). The ground water at this location does <br /> not pose any threat to public health. Water from nearby water-supply wells <br /> is sampled and analyzed every month, and has never shown any <br /> contamination. <br /> The contaminated ground water is in a shallow water-bearing zone, about <br /> 25 to 35 feet below the ground level. This shallow water is not used for <br /> drinking water purposes. Drinking water is pumped from deeper water- <br /> bearing zones that are separated from the shallow zone by layers of rock and <br /> clay. The rock and clay greatly restrict the movement of water between <br /> zones. <br /> LLNL will begin cleanup soon to prevent any further movement of <br /> contamination to offsite areas and to protect water quality. The <br /> contamination in the eastern GSA has moved into ground water beyond the <br /> site boundaries on private and State of California property. The <br /> contaminated ground water follows the path of Corral Hollow Creek <br /> northward from the site boundary for approximately 4,000 feet (see figure). <br /> The Cleanuja Plan <br /> After receiving approval from the Regional Water Quality Control Board <br /> (RWQCB) and the Environmental Protection Agency(EPA), LLNL will begin <br /> immediate treatment of ground water in the eastern GSA to remove the <br /> chemicals that are present. These chemicals are known as volatile organic <br /> compounds (VOCs) and have typically been used as solvents in degreasing <br /> activities at LLNL. <br /> An Equal Opportunity Employer•University of California•P.O.Box 808 Livermore,California 94550•Telephone(415)422-1100•Twx 910-386-8339 UCLLL LVMR <br />