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WIFerNITIVIRrINC. SACRAMENTO <br /> Soil samples will be collected in decontaminated brass tubes placed`inside a <br /> California split-spoon sampler. The curings will be hydraulically hammered to <br /> approximately two feet below the water table (which is reported to be between three and <br /> ten feet bgs) or to a maximum depth of 12 feet bgs. Soil samples will be"collected <br /> continuously while coring the first borehole, and at five-foot intervals beginning at two <br /> feet bgs for the remaining boreholes. Additional soil -samples will be collected at any <br /> change in lithology identified during the drilling. <br /> The soil samples will be collected with a hydraulically driven corer by the driller. <br /> The site supervisor will ensure that the sampler and the brass tubes are tliorou hl <br /> g Y <br /> cleaned prior to collecting each sample. .Versar's standardized procedures for field <br /> sampling are included in Appendix A and will be strictlyadhered to during the <br /> k <br /> g <br /> investigation. <br /> Soil samples will be analyzed in the field using standard field heads"ace analysis <br /> �{ (as described in Appendix A). A maximum of one sample from each coring will be <br /> analyzed by a California-certified laboratory for Total Petroleum Hydrocarbons"as diesel <br /> �! (TPH-D) and gasoline (TPH-G) using EPA Method 8015M, halogenated volatile organic <br /> compounds (HVOCs) using EPA Method 8010, and for benzene, toluene,.ethylbenzene, <br /> and xylenes (BTEX) using EPA Method 8020. <br /> 3.2 Groundwater Sampling Methods and Procedures <br /> Groundwater grab samples will be collected from each of the corings in which <br /> groundwater is identified. To facilitate the colIection:of these samples,'a two-inch well <br /> screen will be inserted into the boring and the water allowed to stabilize for a minimum <br /> of 30 minutes. A 1.5-inch bailer will then be inserted into the coring and a groundwater <br /> sample collected for laboratory analysis. Each of the grab samples will be analyzed for <br /> TPH-G, TPH-D, HVOCs, and BTEX as previously described. <br /> 6 <br /> �A <br /> 11 <br />