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02 February 2004 AGE-NC Project No 99-0624 ' Page 2 of 8 ' Soil samples were collected ahead of the drill bat using a California modified split-spoon sampler loaded with three pre-cleaned 2-inch by 6-inch brass sleeves Soil samples were collected from boring MW-6 at five-foot intervals beginning at 15 feet below surface grade(bsg), and from MW-7 ' at selected intervals beginning at 30 feet bsg using a 140-pound hammer to advance the sampler The number of blows required to advance the sampler over each 6-inch increment of the 18-inch sampling interval were recorded on the boring logs Sampling equipment was washed in an Alconox ' solution and double rinsed with water prior to each sampling run to minimize cross-contamination For each sample,both ends of the leading or other selected sleeve were covered with Teflon sheets, ' capped and sealed with tape The samples were properly labeled,stored on ice and transported under chain-of-custody to Castle Analytical Laboratory(CAL),a State of California Department of Health Services (DHS)-certified analytical laboratory 1 212 Logging ' Soil was extruded from the remainingbrass sleeves of each soil sample collected and was screened p for the presence of organic vapor using an organic vapor meter (OVM) equipped with a photo- ionization detector (PID Thermo Environmental 580A, 10 0 eV, calibrated to isobutylene) The organic vapor readings were recorded on a boring log The soil was then visually described on the ' boring log in accordance with the Unified Soil Classification System (see Appendix A) ' 2 13 Well Completions Pilot boring MW-6 and MW-7 were completed as ground water monitoring wells using two-inch ' diameter PVC casing with 0 020-inch slotted screen installed from approximately 45 feet to 65 feet bsg in boring MW-6 and from 80 feet to 90 feet bsg in boring MW-7, with blank casing extended to the surface The filter pack (No 3 Lonestar sand) was installed from the bottom of each boring ' to approximately two feet above the top of the screened interval A nominal 3-foot bentonite plug was then installed above the filter pack and hydrated The wells were then grouted to near the surface with portland cement Water-tight, traffic-rated well boxes were then installed over the wells ' As-built well diagrams are depicted on the boring logs in Appendix A ' 2 14 Laboratory Analyses of Soil Samples Selected soil samples were analyzed for ITotal petroleum hydrocarbons quantified as gasoline (TPH-g) in accordance with EPA Method 8015M, ' Advanced GeoEnvlronmental,Inc I