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San Joaquin County DIRECTOR <br /> Q u I Donna Heran, REHS <br /> o .c Environmental Health Dep„artment <br /> p M ASSISTANT DIRECTOR <br /> r ? 600 East Main Street Laurie Cotulla, REHS <br /> Stockton, California 95202-3029 PROGRAM COORDINATORS <br /> ,'• Mike Huggins, RENS, RDI <br /> • i;h: +' Margaret Lagorio,REHS <br /> Website: WWW.SJgov.org/ehd Robert McGleflon,RENS <br /> Phone: (209)468-3420 Jeff Carruesco,REHS, RD[ <br /> Fax: (209) 464-0138 Kasey Fofey, REHS <br /> July 15, 2009 <br /> Sergio Morescalchi Ava Langston-Kenney <br /> Atlantic Richfield Company COS Redevelopment Agency <br /> PO Box 1257 425 North EI Dorado Street <br /> San Ramon, CA 94583 Stockton, CA 95202 <br /> Subject: Former ARCO Station #4493 Site Code: 1042 <br /> 205 Center Street <br /> Stockton, CA 95202 <br /> The San Joaquin County Environmental Health Department (EHD) has received your <br /> June 30, 2009 correspondence proposing a change in the frequency of sampling of the <br /> groundwater monitoring wells at the above subject contaminated underground storage (UST) <br /> site. The site has a total of 18 groundwater monitoring wells. Currently three of the wells are <br /> sampled on an annual schedule, seven of the wells are sampled on a semi-annual schedule <br /> and eight of the wells are sampled on a quarterly schedule. <br /> The proposal you submitted was to sample all of the sites groundwater monitoring wells on <br /> an annual schedule. The EHD does not agree with this proposal. The core of the <br /> groundwater contaminant plume remaining at this site is around a former dispenser island <br /> area; this area of the plume is monitored by wells�i MW-4, MW-8M and MW-8D. Interim <br /> remediation by batch extraction of these three wells began in third quarter 2008 and was <br /> being conducted on a quarterly schedule. The EHD considers that to move this site towards <br /> regulatory closure in a timelier manner, this quarterly interim remediation should continue. <br /> The EHD recommends the following sampling regimen: <br /> Semi-Annual- MW-4, MW-5, MW-8M, MW-8D, MW-9M, MW-9D, MW-10M, MW-10D. <br /> Annual- MW-1, MW-2, MW-3, MW-6, MW-7, MW-11 M, MW-11 D, MW-12D, MW-13M, <br /> and MW-13D. <br /> If you have any questions please call Lori Duncan at (209) 468-0337. <br /> Sincerely, <br /> Za <br /> 0Lori Duncan, Senior REHS are Lagorio, 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, Stantec, 3017 Kilgore Road #100, Rancho Cordova, CA 95670 <br />