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v« <br /> FILE COPY <br /> ~ 400 N. EI Dorado, Stockton <br /> Page 2 <br /> PHSIEHD met with Central Valley.Regional Water Quality Board (CVRWQCB)staff on July 26, 2000 and <br /> completed review of the latest report. Due to the TPH-gasoline (440-ppb)and MTBE (7.9 ppb) <br /> contamination evidenced in groundwater, an additional sampling round is required before site closure can <br /> be considered. In addition, CVRWQCB is requiring analyses of gasoline components 9,2 DCA and EDB <br /> be performed. `• <br /> An estimate of contaminant mass in soil and groundwater must be presented in the next-Quarterly Report ' <br /> submitted to this office. <br /> When investigating and evaluating groundwater contamination at this site, you should be following the <br /> Central Valley Regional Water Quality Control Board guidelines found in the Tri-Regional Board Staff: <br /> Recommendations for Preliminary Evaluation and Investigation of Underground Tank Sites, including <br /> Appendix A. <br /> If you have any further questions regarding this matter contact, Harlin Knoll at (209)468-3442. <br /> Donna Heran, RENS, Director <br /> Environmental Health Division <br /> Harlin KrWII, Senior REH Margare Lagorio, REHS <br /> Site Mitigation Unit Supervisor <br /> cc: CVRWQCB—Marty Hartzell <br /> Orion Environmental <br /> r <br /> i <br /> i <br /> 1 <br /> k <br /> i <br />