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03 September 2002 <br /> • AGE-NC Project No 99-0624 <br />' Page 4 of 4 <br />' 32 WELL COMPLETION <br /> The ground water monitoring wells will be completed utilizing a single 2-inch diameter schedule 40 <br />' <br /> p 0 lyvinylchlonde(PVC)well casing with 0 020-mch slotted well screen,proposed well construction <br /> diagrams are depicted in Figures 4, S and 6, respectively <br />' After installing the well casing in each bonng,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 monitoring wells will consist of No 2/12 Lapis Luster Monterey sand <br />' Following placement of the filter pack, the screened interval from each well will be surged for <br /> approximately 20 minutes utilizing a surge block to assist in settling the filter pack Additional filter <br /> pack material will be added if settling occurs <br />' A nominal three-foot bentonite seal (bentonite pellets) will be laced above the filter pack to <br /> ro p ) P <br />' minimize the potential for grout penetration into the screened section of the well The bentonite seal <br /> will be formed by pouring bentonite pellets into the annulus and allowing the pellets to settle on the <br /> filter pack The bentonite pellets will be allowed to hydrate with tap water for a minimum of one-half <br />� . hour prior to grouting <br /> The remaining annular space will be filled to the ground surface with a cement grout The grout <br /> r mixture will consist of Type ILII 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 tremmne pipe A grouting <br /> inspection will be scheduled with SJCEHD personnel <br /> r <br /> 33 WELL DEVELOPMENT <br /> rDevelopment ofthe proposed wells will consist of a combination ofbailing with a two-inch diameter <br /> stainless steel and/or PVC bailers to remove the mayor portion of fine-grained sediment from inside <br /> rthe well, surging to flush out or draw in sediment from the filter pack and additional ground water <br /> evacuation (purging) with a submersible pump to finish the removal of fine-grained sediment <br /> Developmental purging activities will be continued until field parameter(pH,electrical conductivity, <br /> rand temperature) readings have stabilized and purged water is visually sediment-free Well <br /> development will occur no sooner than 72-hours following well completion <br /> r <br /> r <br /> • <br /> Advanced GeoEnvironmental,Inc <br /> r <br />