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1 0 • <br /> FIELD PROCEDURES <br />' Direct Push Borings <br />' Borings B1 through B9 were drilled using a direct push sampling device (Geoprobe) provided <br /> and operated by Vironex Soil samples were collected using a drive point equipped with clean <br />' ane-inch diameter, three-foot long plastic tubes at five-foot maximum intervals, beginning at a <br /> depth of ten feet The tubes were cut to the desired sample length and sealed with teflon-coated <br /> sheets and plastic end-caps to reduce volatile hydrocarbon loss Samples were screened in the <br />' field with a photoionization detector to estimate the extent of hydrocarbon contamination Soil <br /> samples were described in the field using the Unified Soils Classification System (USCS) <br />' Selected samples were placed in an ice chest containing ice and submitted under chain-of- <br /> custody to a California-certified laboratory for analysis of Total Petroleum Hydrocarbons <br /> (TPH) as gasoline using modified EPA method 8015, and for Benzene, Toluene, Ethylbenzene, <br /> and Total Xylenes (BTEX), using EPA method 8020 The sample containing the highest <br /> concentration of TPH as gasoline was additionally tested for volatile halocarbons using EPA <br /> method 8010 and for total lead using EPA method 6010 After sampling activities were <br /> completed, the borings were sealed to the surface with cement grout in accordance with State <br /> and San Joaquin County regulations <br />' Sampling equipment was decontaminated in the field between borings using a solution of <br /> hqumox and water <br /> Soil Bonngs <br /> Soil borings B 10 and B 11 were driIIed by V & W Drilling using a truck-mounted Mobile B61 <br /> drill ng equipped with six-inch diameter, hollow-stem augers Soil samples were collected <br /> from boring B10 beginning at a depth of 46 feet due to its proximity to boring B2 Soil <br /> 0 <br /> samples from boring B11 were collected beginning ata depth of 10 feet below grade Samples <br />