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Mr Harlin Knoll ORI U N <br /> San Joaquin County Environmental Health Division <br /> . 7 July 2000 <br /> Page 6 <br /> the state category of low risk Three wells were drilled and selected soil <br /> samples from each boring were collected and analyzed TPHg, BTEX, and <br /> MTBE were not detected in soil samples from wells MW-2 and MW-3 The <br /> soil sample analyzed from MW-1 yielded MTBE at a concentration of 99 <br /> µg/kg and nondetectable concentrations of TPHg and BTEX These <br /> concentrations are below proposed goals or published Regional Water <br /> Quality Control Board objectives <br /> ❑ Groundwater samples collected during the two rounds of groundwater <br /> sampling indicate the following low impact to groundwater at the site The <br /> cross-gradient well MW-3 did not contain detectable concentrations of <br /> constituents associated with gasoline In monitoring well MW-1 , TPHg and <br /> BTEX were not detected, and only small concentrations of MTBE were <br /> detected during two quarterly rounds of sampling (7 9 and 4 0 µg/l of MTBE, <br /> respectively) Well MW-2 had no detectable concentrations of MTBE <br /> These groundwater concentrations are below EPA and California proposed <br /> goals <br /> ❑ According to the California Water Service, there is no groundwater drinking <br /> well within 2,000 feet of the site <br /> o The site isp aved with asphalt, reducing the likelihood of surface water <br /> infiltration and the potential for migration of the detected constituents in the <br />' soil to groundwater <br /> ❑ Evaluation of the CWRCB's guidance document indicates that this site is a <br /> low risk classification site and could be closed without requiring any <br /> remedial activities <br /> l <br /> I <br /> • <br /> S\13fS\STOCKTON\LTR\LTR004 DOC 7/7/00 <br />