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21 May 2003 • AGE-NC Project No 95-0130 IPage 12 of 16 I will be formed by pouring bentonite chips into the annulus and allowing the pellets to settle on the filter pack The bentonite chips 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 VII 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 I4 2 3 Ground Water Extraction Well Development Development of the proposed ground water extraction wells will consist of a combination of bailing to remove the mayor portion of fine-grained sediment from inside the well, surging to flush out or draw In sediment from the filter pack and additional ground water evacuation(purging) to remove fine-grained sediment Developmental purging activities will be continued until field parameters (pH,electrical conductivity,and temperature)have stabilized and purged water is visually sedlment- 1• free I4 3 REMEDIATION SYSTEM PIPING NETWORK A network of two-inch diameter, schedule 80 PVC piping will be installed from the remediation I wells in a series of trenches,approximately 18-inch wide and 18-inches deep,additionally,one-inch diameter,schedule 80 PVC electrical conduit will be installed in the same trench network and routed from the well-heads at EW-1 and EW-2 to an electrical fuse box All PVC piping will be routed I underground from each remediation well head to either the VES water entrapment or the pump-and- treat holding tank, each located inside the remediation system fenced enclosure A PVC ball valve will be installed at each SVE and ground water extraction well head so that water and/or vapors can I be drawn from each well independently or from a combination of specific wells An individual sample port with check-valve to prevent back-flow cross contamination will be installed at the process piping riser at wells EW-1 and EW-2 These sampling ports will allow sampling of EW-1 ' and EW-2 independently without having to remove the well head assembly Following piping placement,the trench will be backfilled with imported road-base sand,compacted and covered with resurfaced with concrete A cut view drawing of the process piping layout is included in Figure 6 I ' Advanced CcoEnvironmental,Inc I