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San Joaquin County DIRECTOR <br /> ca u rnr E Donna Heran, REHS <br /> o Environmental Health Department <br /> .zX7 flG ASSISTANT DIRECTOR <br /> z 600 East Main Street Laurie Cotulla, REHS <br /> ( Stockton, California 95202-3029 PROGRAM COORDINATORS <br /> Carl Borgman, REHS <br /> .sjgv.org/ehd Mike Huggins, RENS, RDI <br /> Website: wwwo <br /> �r FOR Margaret Lagorio, REHS <br /> Phone: (209) 468-3420 Robert McCiellon,RENS <br /> Fax: (209) 464-0138 ,teff Carruesco,RENS, RDI <br /> Kasey Foley, REHS <br /> September 30, 2008 <br /> Sergio Morescalchi Ava Langston-Kenney <br /> Atlantic Richfield Company COS Redevelopment Agency <br /> PO Box 1257 425 N EI Dorado Street <br /> San Ramon, CA 94583 Stockton, CA 95202 <br /> RE. Former ARCO Station #4493 Site Code: 1042 <br /> 205 Center Street <br /> Stockton, CA 95202 <br /> In correspondence dated January 24, 2007 the EHD notified you that Regional Water Quality <br /> Control Board representatives informed the EHD t, at they do not consider this site a <br /> candidate for regulatory closure due to the fluctuating and increasing concentrations of <br /> petroleum hydrocarbon contaminants reported in gra l ndwater samples collected from wells <br /> MW-4, MW-8M and MW-8D. The EHD recommended that the responsible parties consider <br /> conducting interim remediation of these wells. <br /> On September 29, 2008, a phone conference was held between yourself, your consultant <br /> Stantec Consulting Corporation and the San Joaquin County Environmental Health <br /> Department (EHD) to discuss this issue. It was agreEed that beginning with the 3rd Quarter <br /> 2008 groundwater monitoring and sampling event the field technicians would conduct interim <br /> batch extraction by performing an `over-purge" of theEse three wells; specifically they would <br /> pump a total of up to 400 gallons of groundwater combined from the three target wells. The <br /> ability of the wells to sustain pumping rates will be evaluated during the first event. Initially <br /> the batch extractions will be conducted on a quarterly basis to determine the impact to <br /> contaminant concentrations, and may be increased to €monthly. <br /> If you have any questions please call Lori Duncan at (209) 468-0337. <br /> Sincerely, <br /> Lori Duncan, REHS Margaret gorio, REHS <br /> Senior Registered Environmental Health Specialist Program Coordinator <br /> c: James Barton, CVRWQCB, 11020 Sun Center Drive, #200, Rancho Cordova, CA 95670 <br /> Brian Westhoff, SECOR, 3017 Kilgore Rd., # 100, Rancho Cordova, CA 95670 <br />