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08 April 2003 i <br /> • AGE-NC Project 02-0946 <br />' Page 3 of 7 4 <br /> be constructed of redwood with steel banding, the tanks were contained in separate brick <br />' vaults with concrete floors Each tank had an approximate capacity of 15,000 to 20,000 <br /> gallons Upon discovery of the tanks, the San Joaquin County Environmental Health <br /> Department (EHD) was notified and the tanks were removed under permit Based on <br />' analytical results of soil samples collected from beneath the tanks, it appears that the tanks <br /> contained diesel TPH-d was detected in each of the soil samples collected from beneath <br /> ' UST-1 and UST-2 and in the stockpile soil sample at concentrations ranging from 1,400 <br />' mg/kg (UST-2) to 28,000 mg/kg (UST-1) None of the other target analytes were detected <br /> in the samples collected <br /> 3.0. PROCEDURES <br />' The ground water monitoring wells (MW-1 through MW-3) were installed, developed and <br /> monitored in February 2003 Fieldwork was performed in accordance with Central Valley Regional <br />' Water Quality Control Board(CVRWQCB)guidelines for the investigation of underground storage <br /> tank (UST) sites <br /> 3 1 DRILLING AND SOIL SAMPLING <br />' On 20 February 2003,three soil borings were advanced at the site using a CME-75 high torque drill <br /> rig equipped with 8 25-inch diameter hollow-stem augers to install monitoring wells MW-1 through <br /> MW-3 The drill rig and two-man crew were supplied by Mitchell Drilling Environmental Auger <br /> returns generated by drilling were stockpiled on-site pending Iaboratory analysis <br />' Soil samples were collected ahead of the drill bit using a California modified split-spoon sampler <br /> loaded with three pre-cleaned 2-inch by 6-inch brass sleeves The samples were collected from <br /> monitoring well bonngs MW-1 through MW-3 at five-foot intervals, beginning at 5 feet below <br /> surface grade (bsg) using a 140-pound hammer to advance'the sampler The number of blows <br /> required to advance the sampler over each 6-mch increment of the 18-inch sampling interval was <br /> recorded on the boring logs Sampling equipment was washed in an Alconox solution and rinsed <br /> with water prior to each sampling run to minimize cross-contamination <br /> i a <br /> To preserve each collected sample, both ends of the leading or other selected sleeve were covered <br /> with Teflon sheets, capped and sealed with tape The samples were labeled, stored on ice and <br /> transported under chain-of-custody to Cal Tech Environmental Laboratories (CTEL), a State of <br /> Califorma.Department of Health Services (DHS)-certified analytical laboratory <br /> • <br /> I <br /> Advanced GcoEnvironmental,Inc <br />