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, <br /> Project No 58080-06-02 <br /> May 5, 1995 <br /> conclusions are also supported by the following observations <br /> ' Onsite groundwater monitoring well MW-2 is located along the downgradient south <br /> boundary of the soil hydrocarbon plume The portion of the remaining soil hydrocarbon <br /> ' plume closest to the current groundwater surface exists in the vicinity of boring GB-5, <br /> located approximately 21 feet upgradient/crossgradient from monitoring well MW-2 if the <br /> ' source of the onsite TPHg and TPHd groundwater impacts was resultant from the existing <br /> soil hydrocarbon plume, impacted groundwater would be expected in monitoring well MW- <br />' 2 The absence of detectable TPHg and TPHd in MW-2 support the contention that the <br /> groundwater impacts are from offsite locations <br /> • Onsite groundwater monitoring well MW-3 is located within the central portion of the soil <br /> hydrocarbon plume Soil analytical data from borings GB-6, GB-7 and GB-10 indicate that <br /> the portion of the onsite soi I hydrocarbon plume located upgradient of monitoring well MW- <br /> 3 does not exist below a depth of approximately 25 feet bgs This suggests that the source <br /> iof groundwater impacts at MW-3 are from an upgradient offsite location <br />' Detectable concentrations of VOCs (1,2 DCA, TCE and PCE) are present in wells MW-1 through <br /> MW-5 The subject site is located downgradient of Guild Cleaners and Busy Bee Laundry and <br /> Cleaners (Busy Bee) which have been identified by the California Regional Water Quality Control <br /> Board - Central Valley Region(RWQCB)as being potentially responsible for PCE identified in City <br /> of Lodi drinking water in early 1989 Studies performed for the California Environmental <br /> Protection Agency, Department of Toxic Substanccs Control (DTSC) by URS Consultants indicate <br /> that undelmeated plumes of PCE and TCE exist in groundwater beneath the Guild Cleaners and <br /> Busy Bee sites with plume migration having occurred in a south/southeast direction from the <br /> 1 referenced sites The VOC's detected in groundwater,beneath the former Texaco service station site <br /> appear to be part of the PCE and TCE plumes being investigated by the CRWQCB and the DTSC <br /> „ <br /> -24- <br /> „ <br />