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. 31 January 2000 AGE-NC Project No 97-0290 Page 9of10 borings will be advanced at an angle of approximately 10° from vertical, two boring will be advanced vertically The IAS injection wells will be advanced to total vertical depths of 60 feet bsg Soil samples will be collected at 5-foot intervals as described in the SVE/IAS Pilot Test Work Plan, dated 18 March 1999 and prepared by AGE A limited number samples will be transported to a DHS-certified laboratory and analyzed for TPH-g, TPH-d, BTEX and MTBE in accordance with EPA methods 8015m and 8020 The wells will be completed with 2-inch diameter, schedule 40 PVC casing installed through the hollow stem augers, utilizing 2 5 feet of slotted well casing (0 020-inch) from 57 5 to 60 feet bsg A#3 Lonestar 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 from the bottom of the boring to a point approximately 1 5 feet above the top of the screen A three foot interval of coated 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 to surface grade A proposed IAS injection well diagram is included as Figures 5 • 4 3 2 In-situ Air Spargmg Piping System An electric air compressor will operate independently from the SVE unit This will allow for control of air flow to each IAS well and "surging" of the IAS system, if necessary, to prevent mounding and/or migration of the dissolved hydrocarbons A network of one-inch diameter, schedule 40 PVC piping will be installed from each IAS well head to the air compressor A valve will be installed in the piping to each IAS well so that air flow can be controlled independently for each well Two proposed locations for the air compressor are Illustrated on Figure 3 Proposals for future construction activities at the site will determme the actual compressor location 4 3 3 In-situ Air Sparging Monitoring Activities Quarterly ground water monitoring and sampling is proposed throughout the remediation period However, we recommend monthly measurements of ground water depth and dissolved oxygen from ground water monitoring wells at the site to determine if ground water mounding is occurring and monitor effectiveness of the air sparging Advanced GeoEnvzronmental,Inc