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San Joaquin County <br /> Q.V!!V�-C' Environmental Health Department DIRECTOR <br /> �. _ .o <br /> 600 East Main Street Donna Heran, RENS <br /> Stockton, California 95202-3029 PROGRAM COORDINATORS <br /> Robert McClellon, REHS <br /> „�.• Jeff Carruesco,REHS,RDI <br /> 0.... ... ci�P Website: www.sjgov.org/ehd Kasey Foley, REHS <br /> FOR Phone: (209)468-3420 Linda Turkatte,REHS <br /> Fax: (209)464-0138 <br /> November 30, 2010 <br /> Stephanie McKenna Sandra Yacoub <br /> Chevron Environmental Management Co. Romeo Yacoub <br /> 6111 Bollinger Canyon Road, Room 3652 3978 S. Hwy 99 E. Fr. Road <br /> San Ramon, CA 94583 Stockton, CA 95215 <br /> Subject: Low Price Auto Glass/Former Texaco <br /> Chevron Site ID 309075 <br /> 3978 S. Hwy 99 E. Frontage Road <br /> Stockton, CA 95215 <br /> The San Joaquin County Environmental Health Department (EHD) has reviewed First <br /> Semiannual 2010 Groundwater Monitoring Report (Report) dated October 28, 2010, <br /> prepared and submitted on your behalf by Arcadis. In the Report Arcadis recommends <br /> another change to the groundwater sample analysis regimen. The EHD approves the <br /> following: <br /> 1. All wells shall be analyzed for total petroleum hydrocarbons (TPH) as gasoline, TPH <br /> as diesel, TPH as motor oil, and 1,2-dichloroethane. <br /> 2. MW-1 shall also be analyzed for toluene, ethylbenzene, xylenes and tertiary butyl <br /> alcohol. <br /> 3. MW-6 and MW-6D shall also be analyzed for benzene, toluene, ethylbenzene, <br /> xylenes and tertiary butyl alcohol. <br /> Further evaluation of the required groundwater analyses of MW-6 and MW-6D can be done <br /> after an analytical history in these two wells is established. <br /> Groundwater monitoring wells MW-6 and MW-6D have been sampled twice, though only one <br /> event is on Table 1 of the Report. The first sampling was done in November 2009; analytical <br /> results were reported in Site Assessment Report, dated April 19, 2010, submitted by Arcadis. <br /> At the current monitoring and sampling event, reported concentrations of contaminants <br /> decreased in MW-6 and increased significantly in MW-6D. The concentration of TPHd also <br /> increased significantly in MW-3, while decreasing in some other wells, from previously <br /> reported concentrations. <br /> The confirmed concentrations of contaminant in MW-6D, located downgradient of the <br /> possible source area near the dispenser island, with a total depth of 119 feet below surface <br /> grade (bsg), indicate that the extent of the groundwater contamination at this site is neither <br /> vertically nor laterally defined. Petroleum hydrocarbon contamination was also reported in <br /> the grab groundwater sample collected at 115 feet bsg in soil boring SB-2, which was located <br /> near the dispenser islands. <br />