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(w w 19 July 2004 AGE-NC Project No 95-0109 Page 2 of 7 Soil samples were collected ahead of the drill bit using a California modified split-spoon sampler loaded with three pre-cleaned 2-Inch by 6-inch brass sleeves from wells MW-21,OW-1,OW-2 and OW-3 at five-foot Intervals, beginning at 10 feet below surface grade (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 was recorded on the boring logs Samples were collected from pilot borings MW-20 and MW-22 continuously using a 5-foot split-spoon sampler beginning at 5 feet bsg The sampler was driven every five feet with a hydraulic ram ahead of the drill bit, allowing for continuous soil recovery The soil was removed from the sampler and then placed on plastic for further examination Sampling equipment was washed in an Alconox solution and rinsed with water prior to each sampling run to minimize cross-contamination None of the soil samples collected from the pilot borings were submitted for laboratory analysis 22 LOGGING Soil was extruded from the brass sleeves or 5-foot sampler and was screened for the presence of • organic vapor using an organic vapor meter(OVM)equipped with a photo-ionization detector(PID Thermo Environmental 580B, 10 0 eV, calibrated to isobutylene), and the OVM readings were recorded on the boring log The soil was then visually described in accordance with the Unified Soil Classification System (see Appendix A) 23 WELL COMPLETIONS Pilot borings MW-20,MW-21 and MW-22 were completed as ground water monitoring wells using two-Inch diameter PVC casing with 0 020-inch slotted screen installed from approximately 50 feet to 70 feet bsg in each boring and with blank casing extended to the surface The filter pack (No 3 Lonestar sand)was installed from approximately 70 feet to 48 feet bsg A nominal 2-foot bentomte chip plug was then installed above the filter pack and hydrated Pilot borings OW-1, OW-2 and OW-3 were completed as ozone infection wells using manufacturer-assembled 2-inch by 30-inch microporous sparge points in each boring from approximately 68 feet to 70 feet bsg in OW-1,67 feet to 69 feet bsg in OW-2 and from 66 5 feet to 68 5 feet bsg In OW-3 One-Inch blank casing was extended to the surface The filter pack (#3 Lonestar sand) was installed from the bottom of each boring to approximately two feet above the screen intervals A nominal 4-foot bentonite pellet 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 installed over the wells As-built well diagrams are depicted on the boring logs In Appendix A Advanced GeoEnviron mental,Inc