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San Joaquin County <br />Environmental Health Department <br />1868 East HazeIton Avenue <br />Stockton, Galifornia 95205-6232 <br />DIRECTOR <br />Linda Turkatte, REHS <br />PROGRAM COORDINATORS <br />Robert McClellon, RE) IS <br />Jeff Carruesco, REHS, RDI <br />Kasey Foley, REHS <br />Rodney Estrada, REHS <br />Adrienne Ellsaesser, REHS <br /> <br />Website: www.sjgovorgiehd <br />Phone: (209) 468-3420 <br />Fax: (209) 464-0138 <br />February 19, 2015 <br />Mr. Brian Waite <br />Chevron Environmental Management Company <br />6101 Bollinger Canyon Road <br />San Ramon, California 94583 <br />Subject: Former Chevron Service Station No. 98632 <br />575 West Grant Line Road <br />Tracy, California 95376-2551 <br />Dear Mr. Waite: <br />The San Joaquin County Environmental Health Department (EHD) has received and reviewed <br />Site Assessment Work Plan (Work Plan), dated 22 December 2014, prepared and submitted by <br />your consulting firm, Conestoga-Rovers & Associates (CRA), on your behalf for the above- <br />referenced site. In the Work Plan, CRA proposes to advance two shallow soil borings (B-1 and <br />B-2) to depths of first groundwater [approximately six feet below surface grade (bsg)] to <br />compare current petroleum hydrocarbon concentrations in soil to soil concentrations for <br />residential, commercial/industrial and utility workers listed in Table 1, titled Concentrations of <br />Petroleum Constituents in Soil That Will Have No Significant Risk of Adversely Affecting Human <br />Health. The table is found in Low-threat Underground Storage Tank Case Closure Policy <br />(LTCP) adopted by the California State Water Resources Control Board in August 2012. <br />CRA proposes to: <br />Advance two soil borings using a 3.25-inch-diameter hand auger at locations illustrated <br />on Figure 2 of the Work Plan while continuously logging the boreholes; <br />Screen soil samples for volatile petroleum hydrocarbon contaminants at one-foot <br />intervals using a photoionization detector while advancing the boreholes; <br />Collect two soil samples from each borehole at depths of approximately four-and-a-half <br />and six feet bsg; <br />a Backfill the proposed boreholes from total depth to approximately one foot bsg with <br />portland cement before adding approximately one foot of concrete to grade; <br />Analyze the soil samples for total petroleum hydrocarbons as gasoline (TPHg) by <br />Environmental Protection Agency (EPA) Method 8015; benzene and ethylbenzene by <br />EPA Method 8260 and naphthalene by EPA Method 8270; arid <br />gi <br /> Submit a report of findings approximately sixty days following receipt of all final analytical <br />data.