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San Joaquin :County DIRECTOR <br /> Qu�N Donna Heran, REHS ' <br /> QA' Environmental Health Department ASSISTANT DIRECTOR <br /> 600 East Main Street Laurie Cotulla, REHS <br /> ca. Stockton, California 95202-3029 PROGRAM COORDINATORS <br /> 4 Mike Huggins, RENS,RDI <br /> Website: www. OY.Or /ehd Margaret Lagorio, RENS <br /> s <br /> 4<IFORta 1g g RobertMcClelion, REHS <br /> Phone: (209)468-3420 Jeff Carruesco,REHS, RDI <br /> Fax: (209) 464-0138 iCasey Foley,REHS <br /> April 29, 2009 <br /> Lori Shields <br /> Diesel Performance <br /> 2804 Fremont Street <br /> Stockton, CA 95205 <br /> Subject: Diesel Performance Site Code: 1120 <br /> 2804 Fremont Street <br /> Stockton, CA 95205 <br /> The San Joaquin County Environmental Health Department (EHD) has reviewed. <br /> Groundwater Monitoring and System Operation Report-Fourth Quarter 2008 dated <br /> April 8, 2009, submitted on your behalf by ATC Associates, Inc. (ATC) and has the following <br /> comments.' <br /> ATC recommends in the reportreducing monitoring and sampling of wells MW-1 and MW-2 <br /> to a semi-annual schedule, and wells MW-3 through MW=7 to an annual schedule. The EHD <br /> approved annual sampling of wells MW-3 through MW-7 in correspondence dated <br /> November 19, 2003. Wells MW-1 and. MW-2 may be reduced to the proposed semi-annual <br /> schedule. <br /> ATC also has formalized their proposal, originally made to the EHD in a phone conversation, <br /> to conduct a rebound test of the soil vapor extraction (SVE) remediation system which has <br /> been in full time operation at your, site since January 2007. The EHD agreed with this <br /> proposal by email on February 19, 2009, and understands that rebound test began on <br /> February 13, 2009. ATC did not propose a time frame. for the rebound test; the EHD <br /> recommends the SVE system be restarted after three months of non-operation, or no later <br /> than May 15, 2009. Evaluation of the site for closure cannot be done until it is determined <br /> that no further corrective action is required. <br /> If you have any questions please call Lori Duncan at (209) 468-0337. <br /> Sincerely, <br /> Lori Duncan, REHS Nuel C. Henderson, Jr., PG <br /> Registered Environmental-Health Specialist Engineering Geologist <br /> c: James Barton, PG, CVRWQCB, 11020 Sun Center Dr. #200, RanchoCordova, CA 95670 <br /> Jeanne Homsey, PE, ATC, 1117 Lone Palm Avenue, #201,.Modesto, CA 95351 <br />