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San Joaquin County <br /> Environmental Health Department DIRECTOR <br /> Donna Heran,REHS <br /> 2, 2600 East Main Street PROGRAM COORDINATORS <br /> Q: .< <br /> Stockton, Californias 95202-3029 <br /> Robert McClellon,REHS <br /> • Jeff Carruesco,REHS,RDI <br /> r Kasey Foley,REHS <br /> �q .;.;.. . :P Website: www.sjgov.org/ehd <br /> i F o R Linda Turkatte,REHS <br /> . <br /> Phone: (209) 468-3420 <br /> Fax: (209)464-0138 <br /> June 1, 2011 <br /> Mrs. Margaret A. Marci <br /> 20 Mobile Lane <br /> Crescent City, California 95531-8409 <br /> Subject: Marc! Property <br /> 2969 Loomis Road <br /> Stockton, California 95205 <br /> Dear Mrs. Marci: <br /> The San Joaquin County Environmental Health Department(EHD) has received and reviewed <br /> Work Plan Confirmation Groundwater Sampling (work plan), dated 28 February 2011, <br /> prepared and submitted by your consulting firm, Geological Technics Inc. (GTI) for the above- <br /> referenced site. The work plan was submitted in response to the EHD letter dated 11 January <br /> 2011 directing you to confirm a 'low-risk status' for closure of your site by sampling <br /> groundwater between the source area of the petroleum hydrocarbon contamination and the <br /> water supply wells in the down-gradient and obliquely down-gradient directions from. the <br /> source area, the water supply wells within 600 feet of your site, and the on-site monitoring <br /> wells MW-1, MW-4, MW-5, MW-6 and MW-7. <br /> In the work plan, GTI proposes to: <br /> Update the well survey completed in January 2011 by requesting well information <br /> records from the Department of Water Resources (DWR) followed by a physical <br /> reconnaissance to confirm the presence of water supply wells located within a 600-foot <br /> radius of the site; <br /> • Collect confirmational grab groundwater samples at proposed depth intervals between <br /> 65 and 95 feet below surface grade (bsg) using GeoProbes® technology at four <br /> proposed sampling locations (GW-1 through GW-4) illustrated on Figure 2 of the work <br /> plan; <br /> • Collect confirmation groundwater-samples from the water supply wells located within <br /> 600 feet of the site based on DWR logs.and site reconnaissance; <br /> • Collect groundwater samples from monitoring wells MW-1 and MW-4 through MW-7; <br /> and <br /> • Analyze all groundwater samples for total petroleum hydrocarbons as diesel (TPH-D); <br /> benzene, toluene, ethylbenzene, and total xylenes (BTEX); and naphthalene. <br /> i <br /> i <br />