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15 February 2002 AGE-NC Project No 96-0229 Page 9 of 12 permeability, moisture content, porosity and total organic carbon (TOC) in accordance with the appropriate EPA or ASTM methods Laboratory reports for soil analysis and sample chain of custody documentation will be presented in a report with findings and recommendations 4 2 WELL COMPLETION The ground water extraction well will be completed utilizing a single 6-inch diameter schedule 40 polyvinylchloride (PVC) well casing with 25 feet of 0 030-inch slotted well screen, the SVE well borings will be completed utilizing single 4-inch diameter schedule 40 PVC well casings with 20 feet of 0 020-inch slotted well screen, the IAS well boring will be completed utilizing single 2-inch diameter schedule 40 PVC well casing with 5 feet of 0 020-inch slotted well screen, the ground water monitoring well bonngs will be completed utilizing 2-inch diameter schedule 40 PVC well casings with 20 feet of 0 020-inch slotted well screen Proposed well construction diagrams are depicted in Figures 4, 5, 6 and 7 After installing the well casing in each boring, a filter pack material will be slowly emplaced through the augers over the screen interval to approximately two feet above the screened intervals, filter pack material in the ground water extraction well will consist of a 50/50 blend of pre-washed small- grained aquarium gravel and #3 Lonestar sand, filter pack material in the SVE wells, IAS well and ground water monitoring wells will consist of pre-washed #3 Lonestar sand Following placement of the filter pack, the screened interval from each well will be surged for approximately 20 minutes utilizing a surge block to assist in settling the filter pack Additional filter pack material will be added if settling occurs A nominal two-foot bentonite seal (bentonite chaps) will be placed above the filter pack to minimize the potential for grout penetration into the screened section of the well The bentonite seal will be formed by pouring bentonite chips into the annulus and allowing the pellets to settle on the filter pack The bentonite pellets will be allowed to hydrate with tap water for a minimum of one-half hour prior to grouting The remaining annular space will be filled to the ground surface with a cement grout The grout mixture will consist of Type UII portland neat cement and not more than 6 gallons of water per 94- pound sack of cement The grout will be placed by pumping through tremmie pipe A grouting inspection will be scheduled with SJCEHD personnel 43 WELL DEVELOPMENT Development of the proposed ground water extraction and monitoring wells will consist of a Advanced GeoEnvironmental,Inc