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I <br /> San Joaquin County <br /> OPQ'u' ' ry C Environmental Health Department DIRECTOR <br /> .f <br /> >.• ' _ - ` .O Linda Turkatte, REHS <br /> -� 1868 East Hazelton Avenue <br /> { Stockton , California 95245PROGRAM COORDINATORS <br /> 952456232 PROGRAM <br /> Jeff Carruesco, REFIS , RDI <br /> c' . Kasey Foley, REHS <br /> o.�= � Website: wwwslgov, org1and Rodney Estrada, REFS <br /> Phone: (209) 468-3420 Adrienne Ellsaesser, REHS <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 /> TGR) adopted-by-the CaIifomia_State lllateLResources_ControLBoardin-August2012 <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 /> • 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 ; and . <br /> • Submit a report of findings approximately sixty days following receipt of all final analytical <br /> data . <br />