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San Joaquin County DIRECTOR <br /> o P(].�.!N c Donna Heran,REHS <br /> Environmental Health Department ASSISTANT DIRECTOR <br /> r 2 600 East Main Street Laurie Cotulla, REHS <br /> ` Stockton, California 95202-3029 PROGRAM COORDINATORS <br /> Carl Borgman,REHS <br /> cy �PMike Huggins,REHS, RDI <br /> Website: www.sjgov.org/ehd Margaret Lagorio, REHS <br /> Phone: (209) 468-3420 Robert McClellon,REHS <br /> Fax: (209) 464-0138 Jeff Carruesco,REHS, RDI <br /> Kasey Foley,REHS <br /> APR 19 2008 <br /> Michael Griffin John M. Leubberke <br /> St. John's Episcopal Church City of Stockton <br /> 316 North EI Dorado Street 425 North EI Dorado Street <br /> Stockton, CA 95202 Stockton, CA 95202 <br /> Subject: Sidewalk east of Cancun Restaurant Site Code: 1894 <br /> 135 East Minor Street <br /> Stockton, CA 95202 <br /> San Joaquin County Environmental Health Department (EHD) has reviewed Preliminary <br /> Site Assessment Work Plan (Work Plan) dated April 7, 2008, submitted on your behalf <br /> by Advanced GeoEnvironmental, Inc. (AGE) and has the following comments. <br /> In the Work Plan AGE proposes to begin the investigation of the above subject <br /> contaminated underground storage tank (UST) site with the collection of soil and grab <br /> groundwater samples by Geoprobe. The EHD approves advancement of the five <br /> proposed (more if necessary) Geoprobe direct push borings to collect soil and grab <br /> groundwater samples for laboratory analysis with the following conditions: <br /> 1. The soil boring AGE proposes to locate in the former UST excavation area <br /> should be moved to just outside the excavation area so that it does not go <br /> directly through the backfill. <br /> 2. If obvious signs of petroleum hydrocarbon contamination are noted at the <br /> proposed total depth of any boring (40 feet) the boring should be advanced <br /> further until two consecutive soil samples appear to be free of contamination. <br /> 3. If the boring near the former UST area is extended beyond the 40-foot below <br /> surface grade (bsg) target depth for vertical definition, all subsequent soil <br /> borings must extend to the same final total depth for lateral definition. <br /> 4. If any proposed boring is advanced beyond the 40-foot bsg target depth for <br /> vertical definition of the contamination, then a second grab groundwater <br /> sample for analysis should also be collected. <br /> 5. Sufficient soil samples shall be submitted for laboratory analysis to provide <br /> definition and characterization of the contamination, which may be more than <br /> 16 as proposed by AGE. <br /> 6. Soil and grab groundwater samples must be analyzed for total petroleum <br /> hydrocarbons as gasoline and diesel, benzene, ethylbenzene, toluene, <br /> xylenes, fuel oxygenates, 1,2-dicholorethene and ethylene dibromide by <br /> appropriate EPA approved methods. <br />