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TERRA VAC <br /> samples representative of the vertical component of hydrocarbon impact beneath the site <br /> will be submitted for analytical testing. <br /> Each sampling interval will be screened for the presence of organic vapors using a hand <br /> held organic vapor meter (OVM). Field screening results may not be fully representative <br /> of actual soil conditions. As a result field screening is utilized only as an aid in the <br /> sample selection process. <br /> At least two push point locations will be sampled for soil gas. Soil gas samples will be <br /> collected from successive intervals in each of the two probe locations. Samples will be <br /> collected in Tedlar bags and transported to a laboratory for analysis. Soil gas data will <br /> be used in the risk evaluation to be incorporated in the CAP. <br /> Collected soil and vapor samples will be submitted to a Chevron approved California <br /> State certified laboratory for analysis. Samples will be analyzed for total petroleum <br /> hydrocarbons calculated as gasoline (THPg) and benzene, toluene, ethylbenzene, and <br /> xylenes (BTEX) using EPA methods 8015 modified and 8020, respectively. Groundwater <br /> samples will also be analyzed for the presence of oxygenates (noted in the RWQCB's <br /> letter by Gordon L. Boggs, dated July 18, 1997) using EPA method 8260. <br /> Soil samples representative of varying lithologic units with in the unsaturated and <br /> saturated zones will be evaluated for physical characteristics. All of the submitted soil <br /> samples will be analyzed for natural and dry density, grain density, fraction of organic <br /> carbon(foc) and total porosity. <br /> Each push point location will be backfilled with neat cement grout at the conclusion of <br /> sampling. All intrusive tools used during sample collection will be decontaminated prior <br /> to each use. <br /> Project No. 30-0239 <br /> August 14, 1997 <br /> 3 <br />