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10 June 2008 <br /> AGE-NC Project No. 97-0312 <br /> Page 7 of 11 <br /> of 100 feet bsg utilizing a truck-mounted, drill rig equipped with 8-inch hollow-stem augers. The <br /> proposed soil boring for the extraction vapor wells will be advanced to approximately 30 feet bsg <br /> utilizing a truck-mounted drill rig equipped with 12-inch diameter hollow-stem augers and proposed <br /> soil borings for the observation vapor wells will be advanced with 8-inch diameter hollow-stem <br /> augers. <br /> Soil boring samples will be collected at five foot intervals from approximately five feet bsg to the <br /> total depth of the boring utilizing a California split-spoon sampler loaded with three 2-inch by 6-inch <br /> brass sleeves. The sampler will be driven by dropping a 140-pound hammer from a height of <br /> 30 inches. The number of blows required to advance the sampler in 6-inch increments will be <br /> recorded on the boring log. Soils encountered in the borings will be visually classified by an AGE <br /> geologist in accordance with the Unified Soil Classification System (USCS). Additionally, soil <br /> samples will be field screened for the presence of volatile organic compounds using an OVM <br /> equipped with a photo-ionization detector(PID)calibrated to an appropriate isobutylene standard. <br /> Soil samples from the SVE borings will be analyzed for the constituents listed in Section 2.4. <br /> Soil cuttings and rinseate generated during drilling activities will be containerized in properly labeled <br /> Department of Transportation (DOT)-approved 55-gallon drums, and stored on-site in an area <br /> lacking public access.Disposal alternatives for rinseate and soil will be selected based on results of <br /> a laboratory analysis. <br /> 3.2. WELL COMPLETION AND SURVEY <br /> The proposed shallow high vacuum SVE well,VW-1,will be completed utilizing a 4-inch diameter <br /> schedule 80 polyvinylchloride(PVC)well casing with 20 feet of 0.030-inch slot PVC well screen. <br /> The proposed observation high vacuum SVE wells,VW-2 and VW-3,will be completed utilizing <br /> a 2-inch diameter schedule 80 PVC well casing with 20 feet of 0.020-inch slot PVC well screen. <br /> After installing the well casing in the boring,a filter pack material will be slowly poured through the <br /> augers to approximately two feet above the screened intervals; filter pack material in the ground <br /> water extraction well will consist of a #3 Lonestar or coarse sand. A one foot bentonite seal <br /> (bentonite chips)will be placed above the filter pack to minimize the potential for grout penetration <br /> into the screened section of the well.The bentonite seal will be formed by pouring bentonite chips <br /> into the annulus and allowing the chips to settle on the filter pack. The bentonite chips will be <br /> allowed to hydrate with tap water for a minimum of one-half hour prior to grouting. <br /> The remaining annular space will be filled to within 1 foot bsg with a cement grout. The grout <br /> mixture will consist of Type UII portland neat cement and not more than 6 gallons of water per <br /> 94-pound sack of cement. The grout will be placed by pumping through tremmie pipe.A grouting <br /> Advanced GeoEnvironmental,Inc. <br />