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Michael Infurna , Jr. <br /> August 21, 2002 <br /> Page 3 of 5 ' <br /> Borings <br /> Borings used to collect soil and grab groundwater samples will be performed using direct-push <br /> "geoprobe" technology. Borings will be logged by a geologist under the supervision of a <br /> California-registered geologist. Soils will be classified using the Unified Soil Classification <br /> System (USCS), and recorded on field boring logs. Borings will be tremie-backfilled to surface <br /> using neat cement grout with less than five percent bentonite admixture. <br /> Soil Sampling <br /> Soil samples will be collected from direct-push borings B-1 and B-2 by driving a butyrate-lined <br /> core barrel into the soil and retrieving the sample from within the core barrel. The desired <br /> section of core will then be cut away and capped at each end with Teflon sheeting and pressure- <br /> fitted plastic caps. <br /> Once obtained, each soil sample will be labeled with a sample-specific alpha-numeric number, <br /> date, sampler identification, time, and location. Each sample will be sealed in a zip-lock bag and <br /> stored on ice in a thermally insulated cooler pending delivery to the analytical laboratory. <br /> Groundwater Sampling <br /> Samples collected from direct-push borings will be "grab" samples. Grab-groundwater samples <br /> will be collected by bailing a sample from within the drive casing, or from a temporary PVC <br /> casing and screen installed in a cased or open boring. The bailed sample will be immediately <br /> decanted to a container appropriate for the analysis to be performed. Labeling and handling of <br /> the grab samples will be similar to the protocol used for soil samples. <br /> CHEMICAL ANALYSES <br /> Soil and groundwater samples will be collected to assess the extent of impact to soil and <br /> groundwater beneath and in the vicinity of the Site. Based on the results of the soil samples <br /> collected in 1998 from the UST excavation, soil and groundwater samples will be tested for <br /> TPH-j (7P-4), diesel fuel (TPH-d) and gasoline (TPH-g); aromatic hydrocarbons, benzene, <br /> toluene, ethylbenzene and xylenes (BTEX); and five fuel oxygenates: tertiary butyl alcohol <br /> (TBA), methyl tertiary butyl ether(MTBE), di-isopropyl ether(DIPE), ethyl tertiary butyl ether <br /> (ETBE), and tertiary amyl methyl ether(TAME). <br /> Analyses will be performed by a California Department of Health Services-certified laboratory, <br /> using State, Federal, and industry standard methods. Extractable petroleum hydrocarbons (TPH- <br /> j and TPH-d) will be analyzed by EPA Method 8015 and 8015 modified. Volatile hydrocarbons <br /> 3023-03/104700.4766.230/AUG2]'02 <br />