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FIELD PROCEDURES <br /> Soil Borings <br /> The soil borings will be drilled with a truck-mounted drill rig equipped with hollow-stem <br /> augers or Geoprobe-type push technology. Soil samples will be collected from the borings at <br /> five-foot maximum intervals with a modified California sampler equipped with clean,two- <br /> inch diameter, six-inch long brass tubes; samples and drill cuttings will be described in the <br /> field using the Unified Soil Classification System(USCS). Sample tubes will be sealed with <br /> polytetrafluoroethylene(PTFE)-coated sheets,plastic end caps and duct tape to reduce volatile <br /> hydrocarbon loss. The samples will be screened in the field with an organic vapor analyzer <br /> (OVA)to evaluate potential hydrocarbon content. Selected samples will be placed in an ice <br /> chest containing ice,and submitted under chain-of-custody to a California-certified laboratory <br /> for analysis of Total Petroleum Hydrocarbons (TPH) using modified EPA Method 8015, <br /> Benzene, Toluene, Ethylbenzene, and Xylenes (BTEC and fuel oxygenates using EPA <br /> Method 8260. <br /> Soil borings will be sealed to the surface by pumping a slurry of Portland cement and bentonite into <br /> the boring through a tremie pipe. Soil generated during drilling activities will be placed in sealed, <br /> labeled 55-gallon drums and stored on site. Drilling equipment will be steam cleaned between <br /> borings; steam cleaning rinsate will be contained in the steam cleaning rack/collection system, <br /> transferred to sealed 55-gallon drums and stored on site. <br /> s <br /> WALLACE KUHL <br /> Er ASSOCIATES INC. <br />