SITE INFORMATION AND CORRESPONDENCE FILE 1

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*ftw *M004 9. A NEMA 4 Control Panel with 7 alarm lights, 2 switches (one for each of the two pumps and a reset button; 10. Sensaphone Telemetry system with autodialer; 11. Various valves, sensors, flow meters,pressure gauges and sampling valves; 12. Heating, lighting, and ventilation. Collection Piping System The collection piping system is composed of a trunkline and smaller individual run lines. The trunkline is connected to the MPX treatment center and forms the backbone of the collection system. It is approximately 110 in (360 ft) long and constructed of 100 mm (4") schedule 40 PVC piping. The run lines join individual wellheads to the trunkline with reducing tees. These are of various lengths and constructed of 50 mm(2") schedule 40 PVC piping. The position of wells, MPX treatment center and collection systems are presented in figure 3. Effluent Disposal Systems Access to the base wastewater system was not feasible from the site location within the airfield. Therefore the treated MPX system effluent water was discharged into a subsurface Effluent Evapotranspiration Field (EEF). The EEF was designed to maximize evapotranspiration of the effluent water. Vapor effluent is discharge to the atmosphere after carbon treatment via a 75 mm (3") vent pipe. JP-4 is collected in the fuel tank. The collected fuel is disposed of at an on-base fuel recycling facility. MPX Well-head Design The well head design is illustrated in two different views in figures 4 and 5. The wellhead is constructed in a 600 mm (24")traffic rated manhole with removal steel plate cover. The manhole box is open on the bottom and lined with gravel to allow for drainage of rainwater and runoff. The wellhead is connected to the collection system manifold by PVC piping, valves, and a clear flexible hose joined to the PVC pipe by cam-locks. The design incorporates two ball valves, one to act as a dilution intake for the 50 mm (2") well, the other to control the flow from the MPX wellhead into the manifold system which then flows into the MPX extractor(figure 4). The extraction tube is a 25 mm (1") flush-threaded PVC pipe held in place by a rubber gasketed PVC compression fitting. The PVC pipe is in 1.5 m (5 ft) and 3 m (10 ft) sections with the final section cut to the depth of the groundwater. When adjustment is needed, the compression fitting is simply unscrewed and the tube is adjusted. The tube has calibration marks in inches and l—as a total range of 150 mm (6") adjustment without modification. Figure 5 illustrates the extraction tube position relative to the groundwater when the system is set for extraction of vapors with entrained liquids (slurping). In this case the dynamic water level is raised in relation to surrounding water level due to a vacuum enhanced pressure gradient. 384