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i <br /> . APPENDIX A <br /> FIELD INVESTIGATION METHODOLOGY <br /> Soil Borine Construction and SgMpfing <br /> The sail bormgs were drilled by B & F Drilling with a truck-mounted Mobile B-61 drill rig <br /> equipped with hollow-stem augers Soil samples were collected from each boring at five-foot <br /> maximum intervals with a modified California sampler equipped with clean, two-inch diameter, <br /> six-inch long brass tubes, samples and drill cuttings were described in the field using the Unified <br /> Soni Classification System (USCS) Logs describing the soils encountered in each boring are <br /> presented on Plates 3 through 5 <br /> Sample tubes were sealed with polytetrafluoroethylene (PTFE)-coated sheets, plastic end caps and <br /> duct tape to reduce volatile hydrocarbon loss The samples were screened in the field with an <br /> organic vapor analyzer (OVA) to evaluate potential hydrocarbon content Selected samples were <br /> placed in an ice chest containing ice, and submitted under charas-of-custody to a Calrforma- <br /> certrfned laboratory for analysis of Total Petroleum Hydrocarbons (TPH) using Modified EPA <br /> method 8015, Benzene, Toluene, Ethylbenzene, and Total Xylenes (BTEX), using EPA method <br /> 8020 <br /> Soil generated during drilling activities was placed on the existing soil stockpiles generated during <br /> the removal operations Drilling equipment was steam cleaned between borings; steam cleaning <br /> ansate was contained in the steam cleaning rack/collection system, transferred to sealed 55-gallon <br /> Idrums and stored on site <br /> Monitoring Well Construction <br /> Borings MW1 through MW3 were drilled and sampled as described above and converted to <br /> I <br /> monitoring wells Each well was constructed using two-inch diameter, flush-jointed, Schedule 40 <br /> PVC casing, 0 02-inch slotted casing was used for the screened interval Number 3 sand was <br /> tremred into the well annulus as a filter pack The filter pack extended from the bottom of the <br /> screened interval to approximately two feet above the top of the screened interval A two-foot <br /> WALLACE-KUHL <br /> Rm,&-dpaper &ASSOCIATES INC <br />