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,. 11 March 2002 AGE-NC Project No. 95-0130 ' Page 10 of 13 ' Selected soil samples will be analyzed by a microbiological laboratory for microbial enumeration and physicochemical characteristics; selected soil samples may also be analyzed for intrinsic 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 20 feet of 0.030-inch slotted well screen;the SVE well will be completed utilizing single 4-inch diameter schedule 40 PVC well casings with 30 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; ground water monitoring wells MW-8 and MW-9 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. '• Soil borings MW-10,MW-11,MW-12 and MW-13 will be completed as multi-level ground water monitoring wells utilizing 1.7-inch diameter polyethylene (outer) tubing. The inner tubing will ' consist ofmultiple%:-inch diameter teflon tubes partitioned into separate chambers.A stainless steel, 0.02-inch screen will be wrapped around each perforated area of the tubing. A proposed well construction diagram is depicted in Figure 8. After installing the well casing in each boring, a filter pack material will be slowly emplaced t 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 50150 blend of pre-washed small-grained aquarium gravel and#3 Lonestar sand; filter pack material in the SVE wells,IAS well and ground watermonitoring wells will consist ofpre-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 pellets) will be placed above the filter pack to ' minimize the potential for grout penetration into the screened section of the well; coated bentonite pellets will be utilized in areas submerged beneath ground water. The bentonite seal will be formed by pouring bentonite pellets into the annulus and allowing the pellets to settle 1 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 Advanced GmEnvironmental,Inc. 1