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Skips <br /> Page 2 of 2 <br /> Method 8020. Groundwater samples should also be analyzed for Ethyl Tertiary Butyl Ether(ETBE), <br /> Tertiary Butyl Alcohol(TBA), Methyl Tertiary Butyl Ether(MTBE), Di-isopropyl ether(DIPE)and <br /> Tertiary Amyl Methyl Ether(TAME)by EPA Method 8260 (see attached letter). <br /> Ground water gradient should be reconfirmed at this site,re-survey existing MW heads and coordinate <br /> them with a registered benchmark. Submit a rose gradient diagram with QMRs. <br /> PHS/EHD recommends the cone penetrometry test boring method to obtain relevent lithological and <br /> hydrological data prior to the placement of MWs and to evaluate contaminant migration potential at this <br /> site. <br /> Contact Carol Oz, Senior REHS at(209)468-3440 if you have questions regarding this letter. <br /> Donna Her an, Director <br /> Environmental Health Division <br /> Carol Oz, Senior S Margaret L orio, REHS <br /> Site Mitigation Unit IV Supervisor <br /> cc: Mark List-CVRWQB <br /> Ervin Rifenburg, PE, Foothill Engineering <br />