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\l . 31 January 2000 AGE-NC Project No 97-0290 Page 7 of 10 4 2 1 Soil Vapor Extraction Well Installation s1X Installation of-fivc additional SVE wells is 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 Three borings will be installed near the southern property line at angles from 10° to 25° from vertical, directed toward the south, the three northern borings will be advanced vertically The SVE wells will be advanced to depths of approximately 50 vertical feet bsg and will be completed with 2-inch diameter, schedule 40 PVC well casing installed through the hollow stem augers Soil samples will be collected at 5-foot intervals as described in the SVE/IAS Pilot Teat 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 Each SVE well will utilize approximately 34 feet of slotted well casing (0 020-inch screen size) Three-foot sections of blank casing will be installed at approximately 25 feet bsg and 40 feet bsg • Well materials (casing, No 3 Lonestar sand and bentonite pellets) will be installed through the hollow stem augers A two-foot bentonite plug will be installed adjacent to each of the three-foot sections of blank casing The filter pack will be placed in the remainder of the borehole adjacent to the screen from the bottom of the boring to a point approximately 2 feet above the top of the uppermost screened section The blank sections of casing and bentonite plugs will allow for future isolation of sections of the well to direct remediation to specific soil zones, if necessary If impacted soil is not encountered in the upper interval of the borehole, based upon field indications, blank casing may be substituted through the area of non-impacted soil during Installation of the wells A two foot interval of bentonite pellets(annular seal) will be placed above the filter pack and hydrated Portland cement will be utilized to grout from the annular seal to near surface grade An SVE well construction diagram is depicted in Figure 4 4 2 2 Soil Vapor Extraction Piping System A network of two-inch diameter, schedule 40 PVC piping will be installed above-ground at the site The PVC piping will be routed from each SVE well head to a vapor dropout drum, the vapor dropout drum will be directly connected to the VES A PVC ball valve will be installed in each SVE well line so that vapors can be drawn from each well independently The two proposed VES unit locations are depicted in Figure 3 Proposals for future construction activities at the site will determine the actual VES unit location Advanced GeoEnviron mental,Inc