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Doug Westenhaver Page 3 : <br /> SB-19 and SB-20 and Monitoring Well DMW 5 are located in areas that had the { <br /> highest recorded residual levels of diesel in 1990. The area of SB-19 was 4200 ppm <br /> at 18 feet in 1990 and 24 ppm at 25.5 feet in 1995, SB-20 was 6,900 ppm at 18 feet <br /> in 1990 and 2,800 ppm at 21 feet in 1995 and DMW 5 was 9,200 ppm at 22 feet in <br /> 1990 and 1,900 ppm at 26 feet in 1995. There were no detections of TPH- d below <br /> 31 feet in any analysis indicating vertical definition has been achieved. <br /> PHSIEHD approves the post remedial monitoring program for the Diesel <br /> contaminated soil. In addition, groundwater samples from DMW-1 through DMW-5 <br /> should be analyzed for chlorinated hydrocarbons (solventsNOC's) using EPA method <br /> 601 in addition to BTEX using EPA method 602 to continue to investigate the extent <br /> of the solvent plume. TPH-d using GCFID with a 3510 extraction should be analyzed ti <br /> during the next scheduled quarterly monitoring as proposed in the post remedial <br /> monitoring program. PHSIEHD shall be notified 48 hours prior to the next quarterly <br /> h should be scheduled to occur during monitoring which 9 July of 1996. <br /> 9 <br /> In response to your reference to the Walt Petit memo, the Dames and Moore five <br /> year post remediation monitoring program will provide information as to whether this <br /> site requires additional remediation or is a candidate for closure. <br /> For further information please contact Steven Sasson at (209) 468-3459. <br /> Donna Heran, REHS, Director <br /> Environmental Health Division <br /> Al <br /> Steven Sarson, Senior RENS <br /> Mar aretLa orio REHS <br /> Site Mitigation Unit Lead.Senior <br /> SS <br /> c: Elizabeth Thayer, CVRWQCB <br /> c: John Menke, Dames and Moore <br /> c: Bernie Sloop, American Moulding and Millworks <br />