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San Joaquin County DIRECTOR <br /> Donna Heran, REHS <br /> Environmental Health Department <br /> 4 �y 0 ASSISTANT DIRECTOR <br /> 600 East Main Street Laurie Cotulla,REHS <br /> ,StocktonCalifornia 95202-3029 <br /> PROGRAM COORDINATORS <br /> Mike Huggins,REHS, RDI <br /> Margaret Lagorio, REHS <br /> r Website: www.sjgov.org/ehd Robert M C eilon,REHS <br /> uPhone: (209) 468-3420 Jeff Carruesco,REHS, RDI <br /> Fax: (209) 464-0138 Kasey Foley,REHS <br /> May 11, 2009 <br /> i <br /> j <br /> Mr. Amrit Grewal <br /> Grewal's Market <br /> 4100 East Fremont Street <br /> Stockton, California 95215 <br /> i <br /> Subject: Grewal's Market j <br /> 4100 East Fremont Street ' <br /> 1 <br /> Stockton, CA 95215 <br /> By letter dated January 23, 2009, the San Joaquin County Environmental Health <br /> Department (EHD) had directed the installation of off-site monitoring well MW-5 with a <br /> ten-foot screen to target the sand unit encountered in nearby cone penetration testing (CPT) <br /> boring P-15B. During a telephone conversation on April 29, 2009, between the EHD and i <br /> Advanced GeoEnvironmental, Inc. (AGE), it was decided that a grab groundwater sample <br /> should be collected at the southwest corner of the above-referenced property in place of <br /> installing MW-5 to verify the detection of total petroleum hydrocarbons quantified as ' <br /> gasoline (TPH-g) at 800 micrograms per liter (pg/L) in groundwater samples collected at 1 <br /> sixty-five to seventy-five feet below surface grade (bsg) from P-15B. Please submit a work <br /> plan addendum to the EHD by July 31, 2009, to address. the collection of one grab <br /> groundwater sample in the area of P-15B. <br /> The EHD approves the following reduction in sample collection: <br /> • Semi-annually collect groundwater from monitoring well MW-4 and analyze the <br /> samples for 1,2-dichloroethane (1,2-DCA) only; when annually sampling all wells, <br /> include TPH-g; benzene, toluene, ethyl benzene, and total xylenes (BTEX); and <br /> methyl tertiary-butyl ether(MTBE) in the analysis of the MW-4 sample. <br /> • Annually collect groundwater from MWA, MW-2, and MW-3 and analyze the <br /> samples for TPH-g, BTEX, MTBE, and 1,2-DCA. <br /> By letter dated March 17, 2008, the EHD had directed that soil concentrations of <br /> contaminants of concern that exceeded the Environmental Screening Levels (ESLs) (San <br /> Francisco Bay Regional Water Quality Control Board) for gross contamination and direct <br /> I <br />