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PHS/61D recommends the apparent gradient anomaly be explained or 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. j <br /> If you have any questions, please contact Steve Sasson RENS, at(209)468-3459. <br /> Donna Heran, RENS, Director <br /> Environmental Health Division <br /> j <br /> w <br /> Steven Sass n, enior REHS Margar�Lagorjo, RE S <br /> Site Mitigation Unit Supervisor <br /> cc: Kathryn Broderick, Apex Envirotech ry <br /> Encl. Oxygenates letter <br /> . II <br /> ,I <br />