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APPENDIX A <br /> Page'1 <br /> FIELD INVESTIGATION METHODOLOGY <br /> Soil Bor ing Construction and Same lin <br /> The soil borings were drilled by Westex Drilling with a truck-mounted Mobile B-53 drill rig <br /> equipped with hollow-stem augers. Soil samples.'were collected from each boring at five-foot <br /> maximum intervals with a modified Californiaer alifornia sampler equipped - . <br /> p q pped with clean,.two-inch diamete� r, <br /> six-inch long brass tubes; samples and drill cuttings were described in the field using the Unified <br /> Soil 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 /> ` <br /> organic vapor analyzer (OVA) to evaluate potential hydrocarbon,content. Selected samples were <br /> Placed in an ice chest containing ice, and submitted under chain-of-custody to a California-- ` <br /> certified laboratory for analysis of Total Petroleum Hydrocarbons (TPH) using Modified EPA' <br /> l method 8015, Benzene, Toluene, Ethylbenzene, and Total Xylenes (BTEX),.using EPA method <br /> 8020. ' <br /> Soil generated during.drifling activities was placed on the existing soilstockpiles generated during <br /> the removal operations. Drilling equipment was steam cleaned between borings; 'steam cleaning <br /> rinsate was,contained in the steam cleaning rack/collection system, transferred to sealed 55-gallon <br /> drums,and stored on site. <br /> r Monitoring Well Construction <br /> Borings MW-4 through MW-6 were drilled and ,sampled .as described above and converted to <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 /> tremied 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 /> ae •tee Pape, Fr ASSOCIATES INC. <br /> _j <br />