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E21 May 2003 AGE-NC Project No 95-0130 Page 7 of 16 ' should be adequate to address interim remediation efforts in the `core' area of the dissolved petroleum hydrocarbon plume, proposed ground water extraction well locations and results of the capture zone analysis are illustrated in Figure 3 AGE proposes installation of ground water extraction wells in the following locations • A six-inch diameter ground water extraction well (EW-1) screened between 30 and 55 feet ' bsg(Hydrologic Unit No 1)and located approximately 5 to 15 feet north of monitoring well MW-6, and ' • A six-inch diameter ground water extraction well(EW-2) screened between 30 and 55 feet bsg{Hydrologic Unit No ])and located approximately 10 to 20 feet northeast of well VW-2 IFollowing installation of ground water extraction wells EW-1 and EW-2,AGE will install dedicated, four-inch diameter Grundfos submersible pumps (model 5E5) inside each extraction well The pumps will be designed to operate continuously at low flow rates ranging between five and ten gallons per minute (GPM) Additional information for the proposed submersible pumps are in Appendix A I� 3 3 INSTALLATION OF INTERIM REMEDIATION SYSTEM PIPING NETWORK IA remediation system piping network will be installed underground in a 1%rfoot wide by a 1'/z-foot deep trench, the proposed trenching location is depicted in Figure 5, a cross sectional view of the ' trench is depicted in Figure 6 In the trench, two-inch diameter, schedule 80 PVC piping will be 1) manifolded from the well-heads at VW-1, VW-2, VW-3 and routed to the proposed vapor extraction unit,and 2)manifolded from the well-heads at EW-1 and EW-2 and routed to the ground I water treatment system Following piping placement, the trench will be backfilled with imported road-base sand, compacted and resurfaced with concrete ' Installation of a 20-foot wide by 40-foot Iong, chain-link, gated enclosure will be located in a southwest section of the site to secure the vapor extraction unit and the ground water treatment system The proposed remediation system fencing enclosure is illustrated in Figure 5 34 PROPOSED INTERIM SOIL REMEDIATION SYSTEM ' TheY ro osed interim remediation SVE system will consist of a vacuum blower(Solleco Ecat 250) p P and a catalytic converter The two-inch diameter piping installed underground from the well-head ' at wells VW-1, VW-2 and VW-3 will be connected to the inlet of the vacuum blower, the outlet • from the vacuum blower will be routed through a catalytic converter Induced vacuum will measured ' Advanced GeoEnvironmental,Inc I