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San Joaquin County DIRECTOR <br /> I Donna Heran,REHS <br /> PQu'N Environmental Health Department <br /> I F' ASSISTANT DIRECTOR <br /> 600 East Main Street Laurie Coiulla, REHs <br /> Stockton, California 95202-3029 <br /> PROGRAM COORDINATORS <br /> Carl Borgman, REHS <br /> Website: www.sjgov.orgi11ehCl Mike Huggins,RENS, RDI <br /> L F°R Mararet La , REHS <br /> Phone: (209) 468-3420 Robert M Clellllon, RENS <br /> Fax: (209)464-0138 Jeff Carruesco,RENS, RDI <br /> Kasey Foley, REHS <br /> MAY 2 8 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 /> San Joaquin County Environmental Health Department (EHD) has reviewed First Quarter <br /> 2008 Quarterly Groundwater Monitoring and Sampling Report, dated May 13, 2008, <br /> submitted on your behalf to Geotracker by Secor International Incorporated (SECOR) and <br /> has the following comments. <br /> The Report documents a routine quarterly groundwater monitoring and sampling event <br /> that was conducted at your site on January 9, 20081 In the Report SECOR recommends <br /> modification to the sampling regime from quarterly) to semi-annual for monitoring wells <br /> MW-3, MW-5 through MW-7, MW-11 M, MW-13M and MW-11 D through MW-13D. The <br /> EHD agrees with and approves this recommendation. <br /> In correspondence dated January 24, 2007 the E H D notified you that Regional Water <br /> Quality Control Board representatives informed the EHD that they do not consider this site <br /> a candidate for regulatory closure due to the fiuctua`ting and increasing concentrations of <br /> petroleum hydrocarbon contaminants reported in groundwater samples collected from <br /> wells MW-4, MW-8M and MW-8D. The EHD recommended that the responsible parties <br /> consider conducting interim remediation of these wells. In the interest of moving this site <br /> towards regulatory closure, the EHD reiterates this recommendation. <br /> If you have any questions please call Lori Duncan at (209) 468-0337. <br /> Sincerely, <br /> CC"---"— <br /> Lori <br /> C---"— <br /> Lori Duncan, REHS Margaret�Lagorio, REHS <br /> Senior Registered Environmental Health Specialist Program Coordinator <br /> c: James Barton, CVRWQCB, 11020 Sun Center Drive, Rancho Cordova, CA 95670 <br /> Brian Westhoff, SECOR, 3017 Kilgore Rd. Ste 100E, Rancho Cordova, CA 95670 <br />