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iV <br /> P <br /> - � - - - - 1n �L ( Ld"afte. REEIS <br /> Im r t - -- - - - <br /> t I s <br /> � � ] , t :, _ _____ ____ J rGdrn esco REHS, RDI <br /> \�`q1 i -c 1 - Kasey Fa Bey REF'S <br /> Radrey Estrada, PEI-IS <br /> F trGr „ (CLz tFS ,. tllf "( Rdrw_nne Elsaesser, REHS <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 /> i <br /> The San Joaquin County Environmental Health Department (EHD) has received and reviewed <br /> Site Assessment Work Plan (Work Plan), dated 2 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 (8-1 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 Wfll 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 /> p 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 /> b Analyze the soil samples for total petroleum hydrocarbons as gasoline (TPHg) by <br /> Environmental Protection Agency (EPA) Method 8015: benzene and othylbenzene by <br /> EPA Method 8260andnaphthalene by EPA Method 8270 ; and <br /> Submit a repot of findings approximateiv sixty days following receipt of all final analytical <br /> data. <br />