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r r20 December 2001 AGE-NC Project No 01-0827 rPage 2 of 8 r22 WELL COMPLETION Borings IAS1 through IAS3 were completed as air sparging wells using two-inch diameter PVC r casing with 0 020-inch slotted screen Each well were drilled to a total depth of 40 feet bsg and was completed with a 5-foot screen interval rBorings V W6 through V W8 were completed as vapor extraction wells using two-inch diameterPVC casing with 0 020-inch slotted screen These borings were drilled to a total depth of approximately r30 feet bsg and completed with a 15-foot screen intervals The filter pack(No 3 Lonestar sand)was installed approximately 1 foot above the screened intervals rin the air-sparge wells LAS-1 to IAS-3 and vapor wells VW-6 through VW-8 A 4-foot bentonite pellet plug was installed above the filter pack in the IAS wells and hydrated A nominal 1-foot bentonite pellet plug was installed above the filter pack in the S VE wells 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 in Appendix A 23 SOIL-VAPOR EXTRACTION SYSTEM INSTALLATION A subsurface pipe network was installed between 30 July and 09 August 2001 Wells VW-1 through VW-8 were piped directly to the northeast corner of the SVE enclosure fence located northwest of the former UST area and at the north west corner of the western parking area The connection was made using 2-inch diameter schedule 40 PVC piping and 2-inch gate valves to control flow from individual wells Each IAS well was connected to the remediation enclosure area and IAS unit by rusing 2-inch diameter schedule 40 PVC piping and 1-inch gate valves to control infected air-volume to individual sparging wells The piping was placed below surface grade approximately 36 inches The trench was backfilled with pea-gravel, compacted over with road base mix and covered by asphalt The two-inch piping runs was formed into a manifold The influent line was routed throe a Fuji, PP g � 10-horsepower, regenerative vacuum Blower,maximum 210 standard cubic feet per minute (scfm) and through two moisture knockout vessels(55-gallon drums)for moisture separation and to prevent water collection within treatment media The vapor influent line was routed through two 65-gallon carbon canisters to adsorb hydrocarbon vapor from the subsurface The 65-gallon carbon canisters were replaced on 01 November 2001 with 85-gallon carbon canisters after PID readings indicated excessive discharge, and as indicted by laboratory analysis of samples . collected during the first sampling event A Magnehelic vacuum gauge was temporally attached to the inlet of the blower,a temperature gauge Advanced GeoLnvironmental,Inc