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A S S O C I A T E S I N C <br /> i <br /> Historical depth to groundwater information obtained from DWR and California Water Service <br /> r Company. The historical highest depth to water for the vicinity of the site occurred in 1984 and <br /> 1987 where depth to water in the vicinity of the site ranged from approximately 21 to 48 feet bgs <br /> (Table 1, Figure 3). Four of the monitoring points nearest the subject site indicate the water table <br /> ' was between 31 feet and 48 feet bgs in 1987. <br /> Although ATC did not perform a Risk Based Corrective Action Study or utilize a contaminant <br /> r fate and transport model (Vleach), nonetheless, based on available information, it can be assumed <br /> that there is a potential that groundwater may have been affected by residual soil contamination <br /> while groundwater was at its highest elevation between 1984 and 1987. However, the site's low <br /> rpetroleum hydrocarbon concentrations observed at a depth of 30 feet bgs suggest that potential <br /> groundwater impaction, if any, would not appear to be significant. Additionally, the nearest <br /> groundwater receptor is a well approximately 800 feet upgradient of the site which is screened <br /> ' from 79 to 83 feet bgs, 188 to 191 feet bgs, 194 to 220 feet bgs, and 240 to 250 feet bgs. <br /> ATC recommends no further action at this site. This site should be evaluated by PHS/EHD <br /> ' personnel for closure as a low-risk site. <br /> 1 <br /> 1 . <br /> 1 <br /> i I <br /> i <br /> 1 <br /> r <br /> r <br /> w:197736�reportslwelsurv.doc 4 <br /> 1 <br />