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12 September 2003 AGE-NC Project No. 01-0865 Page 5 of 7 method selected and for all necessary construction work,including electrical source installation. A minimum of 48 hours notice will be given to the EHD prior to performing any field work. 4.2. REMEDIATION SYSTEM PIPING NETWORK A network of two-inch diameter,schedule 80 polyvinylchloride(PVC)piping will be installed from the remediation wells in a series of trenches,approximately 12-inch wide and 18-inches deep. This piping will house the air supply and fluid outlet lines running to and from the pump.All PVC piping will be routed underground from the remediation well head to the pump-and-treat holding tank, located inside the remediation system fenced enclosure.Following piping placement,the trench will be backfilled with imported road-base sand, compacted and covered with resurfaced with sod or concrete depending on the surface terrain. A cut view drawing of the process piping layout is included in Figure 5. 4.3. GROUND WATER EXTRACTION SYSTEM An air-driven down well pump will be installed in well EW-1 (Figure 7).Air supply and fluid return lines will be routed from the custom cap at the top of the well to the pump, air return hose will also be connected to the pump and allowed to vent at the well head(Appendix B).To minimize sediment intake through the pump,the bottom of the pump/motor assembly will be suspended approximately one foot from the bottom of the well. Ground water will be continuously pumped from the bottom of the 6inch diameter well EW-1 at low-flow rates between 0 and 3 GPM and routed through underground PVC piping to a 750-gallon holding tank. The air-driven groundwater extraction pumps will be run by an air compressor located in the remediation system enclosure(Figure 6).The air is routed to the pumps through a series of trenches as mentioned above.AGE anticipates total ground water extraction flow between two and five GPM. 4.4. GROUND WATER TREATMENT SYSTEM From well EW-1, extracted ground water will be routed to a 750-gallon holding tank, from which it will pass through a process pump and a 1-micron sediment bag filter to the three-stage treatment system. The holding tank is equipped with various level control switches which serve to control the rate at which extracted water is introduced into the treatment vessels, to provide safety shutoff capabilities and to allow coarser sediment to settle out prior to treatment. Advanced GwEnvironmentel,Inc.