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29 April 2002 <br /> AGE-NC Project No 95-0173 <br />' Page 4 of 5 <br /> total organic carbon (TOC) in accordance with the appropriate EPA or ASTM methods Laboratory <br />' reports for soil analysis and sample chain of custody documentation will be presented In a report <br /> with findings and recommendations <br /> 3 2 WELL COMPLETION <br /> The ground water extraction well will be completed utilizing a single 6-inch diameter schedule 40 <br /> polyvinylchloride (PVC) well casing with 30 feet of 0 030-inch slotted well screen, a proposed well <br />' construction diagram is depicted in Figure 3 <br /> After Installing the well casing in the boring, a filter pack material will be slowly emplaced through <br />' the augers over the screen interval to approximately two feet above the screened Intervals, filter pack <br /> material in the ground water extraction well will consist of a 50150 blend of pre-washed small- <br /> grained aquarium gravel and#3 Lonestar sand Following placement of the filter pack, the screened <br />' Interval from the well will be surged for approximately 20 minutes utilizing a surge block to assist <br /> in settling the filter pack Additional filter pack material will be added if settling occurs <br /> A nominal two-foot bentonite seal(bentonite chips)will be placed above the filter pack to minimize <br />' the potential for out penetration into the screened section of the well The bentonite seal will be <br /> p 1�' <br /> formed by pouring bentonite chips into the annulus and allowing the pellets to settle on the filter <br /> pack The bentonite pellets will be allowed to hydrate with tap water for a minimum of one-half hour <br /> prior to grouting <br />' The remaining annular space will be filled to the ground surface with a cement grout The grout <br /> mixture will consist of Type VU portland neat cement and not more than 6 gallons of water per 94- <br /> pound sack of cement The grout will be placed by pumping through tremmie pipe A grouting <br /> inspection will be scheduled with SJCEHD personnel <br /> 3 3 WELL DEVELOPMENT <br /> Development of the proposed ground water extraction well will consist of a combination of bailing <br /> with a two- or four-Inch diameter stainless steel and/or PVC bailers to remove the major portion of <br /> fine-grained sediment from Inside the well, surging to flush out or draw in sediment from the filter <br /> pack and additional ground water evacuation (purging) with a submersible pump to finish the <br /> removal of fine-grained sediment Developmental purging activities will be continued until field <br /> parameter(pH, electrical conductivity, and temperature) readings have stabilized and purged water <br /> is visually sediment-free Well development will occur no sooner than 72-hours following well <br /> completion <br />' Advanced GeoEnwronmental,Inc <br /> 1 <br />