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Final Release LLNL Site 300 (USDOE) <br /> I <br /> f Sewage treatment <br /> �Yo+id <br /> AILt <br /> - <br /> + ;' + Monitoring well <br /> - t- <br /> r 16 Inactive water-supply well <br /> + % Total VOC isocancentratiOn <br /> contour(µgfl.),dashed <br /> • ,,,�! a where approximate <br /> 'x <br /> Scale:Meters <br /> ca+� <br /> 0 50 100 <br /> Figure 6:Total VOC Concentrations in Groundwater in the Central GSA <br /> Site 300. Nevertheless,the TCE plume emanating from the central GSA still extends beyond the <br /> site boundary(see Figure 6) at levels above drinking water standards. Because of this,ATSDR <br /> scientists have classified current exposure to this plume as potentially completed even though the <br /> contaminants have not been detected in the downgradient water supply wells (CDF-1 and CON- <br /> 1). <br /> There are no completed past exposure pathways for contaminated groundwater. No <br /> contamination from Site 300 has ever been detected in off-site water supply wells. The town of <br /> Tracy, CA, approximately 9 miles to the northeast of Site 300, is hydrologically isolated from <br /> any contamination at Site 300. With respect to contaminated groundwater plumes emanating <br /> from the Pit 6 OU and the residents of the CSVRA,there has been no evidence of contamination <br /> migrating off-site to any of the water-supply wells, monitoring wells, or springs located in the <br /> CSVRA residential area. For these reasons, ATSDR scientists conclude that there is no <br /> completed past exposure pathway for contaminated groundwater. <br /> Potential Future Exposure <br /> Potential future exposures to both GSA plumes and to the groundwater plume from the Pit 6 OU <br /> have been classified as potentially completed. However, in light of LLNL's successful <br /> 16 <br />