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43 f5 Waterloo Road, Stock - 2 - 11 March,1999 <br /> On 10 March 1999 I discussed this site with Mr. Jeff Wong and Ms. Margaret Lagorio of San Joaquin <br /> County. I reviewed the soil contamination results and soil boring data with.them and they agreed that at <br /> least one groundwater monitoring well is needed to evaluate water quality at the site. We also agreed <br /> that two consecutive quarters of groundwater monitoring and sampling for TPHg, BTEX, the fuel <br /> oxygenates and 1,2-D is necessary. <br /> SUMMARY: <br /> Based on MTBE, BTEX and TPHg contamination reported in soil to 37 feet bgs and the subsurface soil <br /> types, there is potential for water quality impact from the former USTs. San Joaquin County staff agree <br /> at least one groundwater monitoring well is necessary (in the expected direction) downgradient of the <br /> former and current USTs, to evaluate water quality below the site. Following monitoring well <br /> development, groundwater samples should be collected and analyzed for TPHg, BTEX, the fuel <br /> oxygenates (MTBE, TAME, DIPS, ETBE and TBA by EPA Method 8260), and 1,2-DCA. At least.two �__ <br /> —_ "consecutive quarters of sampling is necessary to verify water quality. However, any impact to water <br /> quality should require additional groundwater investigation. Concurrence.with the San Joaquin County <br /> Local Oversight Program determination of"No Further Action Required" is premature at this time. <br /> f <br />