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w Coca-Cola Enterprises- West <br /> - USTEC Job No. 90054.03 <br /> Based on field work and analytical chemistry results, concentrations of high-boiling point <br /> hydrocarbons(diesel)and low-boiling point hydrocarbons(gasoline)were identified in the soils <br /> in concentrations above recommended cleanup levels as determined from the State of California <br /> Leaking Underground Storage Tank Manual (LUFD in the 1,000 gallon UST excavation. The <br /> results of the UST investigation were presented to the San Joaquin County Public Health <br /> Services, h.,vironmenial Health Division, in a Preliminary Underground Storage Tank <br /> `- Investigation Report. <br /> 2.2 CONTAMINATION ASSESSMENT <br /> Following the preliminary UST investigation, USTEC was retained by CCE-W to conduct a <br /> - contamination assessment at the Stockton site. The purpose of the assessment was to assess the <br /> vertical and lateral extent of petroleum hydrocarbon contamination identified at the site during <br /> underground storage tank(UST)removal operations. <br /> The initial field assessment consisted of a soil gas survey which was conducted by USTEC in <br /> T May 1990. The survey was designed to provide initial estimates of the lateral extent of volatile <br /> i <br /> hydrocarbons in the soil and provide a basis for selecting groundwater monitoring well <br /> locations. The assessment continued in August 1990 with the drilling of six soil borings and the <br /> r installation of three groundwater monitoring wells. An additional seven borings were drilled <br /> and two additional groundwater monitoring wells were installed in September 1990. <br /> The groundwater monitoring wells were surveyed by a registered California land surveyor. <br /> • Groundwater samples were collected from all groundwater monitoring wells. Soil and <br /> r groundwater samples were analyzed for total petroleum hydrocarbons{I I'H}in accordance with <br /> EPA method 8015 modified for gasoline and diesel. In addition,samples were analyzed for the <br /> aromatic hydrocarbons, BTEX in accordance with EPA method 8020, for polynuclear aromatic <br /> PA method 8100,and for lead in accordance with EPA <br /> hydrocarbons{PNA}in accordance with E <br /> method 7421. <br /> 3 <br />