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4 SUPM FROM <br /> P 2 <br /> PHSIEHD recommends the apparent gradient anomaly be explained cr Justified and the presence <br /> of MTBE In MW-3 be confirmed by EPA method 8260 prior to implementing additional <br /> investigation A workplan for the additional investigation should be submitted when the gradient <br /> and MTBE issues are resolved <br /> If you have any questions,please contact Steve Sasson REHS,at(209)468-3459 <br /> Donna Heran, REHS, Director <br /> Environmental Heath, Division <br /> j"d- r <br /> Ste en Sasso , nior REHS t.agono, RE S <br /> Site Mitigation Unit MargareSupervisor <br /> cc Kathryn Broderick,Apex Envirotech <br /> Encl Oxygenates letter <br /> �i <br />