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4 20 January 2000 AGE-NC Project No 95-0173 Page 12 of 14 volume of processed vapor, oxygen level and the lower explosive limits) will be measured on a weekly basis to ensure optimal destruction of recovered hydrocarbon vapors Vapor samples will be collected on a monthly basis from the influent end of the VES utilizing the vacuum pump on a Model 580A organic vapor meter(Thermo Environmental Instruments Inc) The samples will be collected in Tedlar bags and transported to a DHS-certified laboratory in a chilled container under Ice and transported under chain-of-custody procedure During the"start-up"period for the SVE system, organic vapor and operational parameters(air flow, combustion temperature, volume of processed vapor, oxygen level and the lower explosive limits) will be monitored on a daily basis The anticipated start-up period will be approximately one week 43 IN-SITU AIR SPARGING SYSTEM DESIGN Initiation of an IAS system is proposed for the petroleum hydrocarbon-impacted area, IAS is proposed in conjunction with SVE concurrently at the site The proposed IAS system would comprise of an electric air compressor to inject air beneath the water table using air spargmg wells The compressor will provide between 3 and 10 pounds per square inch(psi) of air to each air sparge well The injected air will volatilize dissolved hydrocarbons in ground water, and force hydrocarbon vapors into the vadose zone, where they can be withdrawn by the SVE system The proposed IAS system will consist of the two existing IAS wells (VW-1 and VW-2) in addition to twelve proposed new IAS wells Approximate air sparging well locations are depicted in Figure 3 4 3 1 In-situ Air Sparging Well Installation Installation of twelve IAS injection wells are proposed utilizing a truck-mounted drill rig equipped with 8-inch diameter hollow stem augers Hollow stem augers will be cleaned prior to advancement in each borehole The IAS injection wells will be advanced to depths of approximately 30 feet bsg The IAS injection wells will be completed with 2-inch diameter, schedule 40 PVC casing emplaced through the hollow stem augers, utilizing five feet of slotted well casing (0 020-inch) from 25 to 30 feet bsg A #3 Lonestar Lapis Luster sand will be poured down the annulus between the well casing and the inner wall of the hollow stem auger The filter pack will be placed adjacent to the screen (0 020 inch screen size) from the bottom of the boring to a point approximately 2 feet above the top of the screen A five-foot interval of coded bentonite pellets (pell plug)will be placed above the filter pack and will serve as an annular seal Portland cement will be utilized to grout from the annular seal Advanced GeoEnvironmentai,Inc