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I02 June 1999 <br /> AGE-NC Project No 97-0326 <br /> IPage 2 of 7 <br /> AGE <br />' The installation of round water monitoring wells was subsequently required b the San Joaquin <br /> g g q _ q Y <br />' County Public Health Services - Environmental Health Division (PHS-EHD) <br />' 3.0. PROCEDURES <br /> All field work was performed in accordance with San Joaquin County Public Health Services - <br />' Environmental Health Division (PHS-EHD) and Central Valley Regional Water Quality Control <br /> Board (CVRWQCB) guidelines for investigations of underground storage tank (UST) sites and in <br /> accordance with the Monitoring Well Installation Work Plan -July 1998 and subsequent addendum, <br /> Lprepared by AGE <br />' 3 1 DRILLING AND SAMPLING <br /> On 02 and 03 December 1998, three soil borings were advanced at the site Borings MW1, MW2 <br /> and MW3 were advanced to depths of 55, 48 and 48 feet bsg, respectively, using a B-53 drill rig <br /> equipped with 8 25-inch diameter hollow-stem augers Boring MW 1 was advanced through a <br /> conductor casing previously installed adjacent to the current UST location Boring MW2 was <br /> advanced northeast of the northern dispenser island, MW3 was advanced northeast of the southern <br /> dispenser island The drill rig and three-man crew were supplied by Central Valley Drilling (CVD) <br /> t of Rancho Cordova, California Auger returns generated by drilling were placed in 55-gallon DO r- <br /> approved drums, labeled and stored on-site pending laboratory analysis <br /> Soil samples were collected ahead of the drill bit using a split-tube sampler loaded with three pre- <br /> cleaned 2-inch by 6-inch brass sleeves The samples were collected at five-foot intervals, beginning <br /> at a depth of 15 feet bsg in boring MW 1 and at a depth of 5 feet bsg in borings MW2 and MW3, <br /> using a 140-pound hammer to advance the sampler 18 inches The number of blows required to <br /> advance the sampler in 6-inch increments was recorded on the boring logs Sampling equipment was <br />' washed in an Alconox solution and rinsed with water prior to each sampling run to avoid cross- <br /> contamination <br /> For each sample,both ends of the leading sleeve were covered with Teflon sheets, capped and sealed <br /> with tape The samples were labeled, stored on ice and transported under chain-of-custody to Alpha <br /> Analytical Laboratories, Inc (AAL), a State of California Department of Health Services (DHS)- <br /> certified laboratory, in Ukiah, California <br /> i <br /> 1 <br /> Advanced Geol;nvironmental,Inc <br />