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This system has been effective in product migration control, recovery and containment of <br /> dissolved phase impacts. Its operation has resulted in the development of an effective cone of <br /> depression and groundwater capture in the central plant area. It is also believed to have induced <br /> migration of floating hydrocarbon product toward recovery well EW-2, since pumping was <br /> started in this well in October 2002. However, the inability of the total liquids system to recover <br /> floating hydrocarbons has resulted in floating product that has not yet been recovered. <br /> Because it is effective in controlling dissolved phase and product migration, this system will <br /> continue to be operated as it has in the past. To augment the system an additional recovery well <br /> will be installed to the south of well EW-2. This new well (EW-3, shown on Figure 4) will <br /> enhance total product recovery and will provide backup to maintain capture, should well EW-2 <br /> become inoperative. The new well will be installed using protocols and procedures described in <br /> Appendix A <br /> Because of poor production from well RW-5A since 2002, this well will be considered for use as <br /> a product-specific recovery point. Before installation of a product recovery pump, measurements <br /> of hydrocarbon thickness will be taken to determine whether this is a viable recovery point. <br /> Recent descriptions of water discharged from this well describe it as clear and odorless, leading <br /> to speculation that hydrocarbons are no longer present at this location. The submersible pump <br /> from well RW-5A will be removed for use in new extraction well EW-3 and replaced with a <br /> floating skimmer pump, provided recoverable product is present. <br /> 3.1.3 Phase 3—Enhanced Product Recovery <br /> Phase 3 will consist of the installation of enhanced product recovery pumps in new and existing <br /> wells in the central plant area. The well locations have been selected to optimize product <br /> recovery. Two additional well locations (shown in Figure 4), consisting of 2-inch <br /> monitoring/recovery points and well RW-5A, which will be assessed for use as a product <br /> specific recovery point may be used for product recovery. This is exclusive of the new 4-inch <br /> recovery well EW-3, to be installed to the south of well EW-2. The proposed new well locations <br /> and rationale are as follows: <br /> • MW-20—This well is to be located about 30 feet north and 30 feet west of recovery well <br /> EW-2 and will act to as a recovery point for hydrocarbons in this portion of the cone of <br /> depression. <br /> • MW-21 — This well is to be located about 20 feet south of recovery well EW-2 and will <br /> act to as a recovery point for hydrocarbons in this portion of the cone of depression. <br /> In addition to the two new wells, existing monitoring well MW-3 and/or MW-4 may be <br /> converted to product-specific recovery points. Both of these wells are now periodically skimmed <br /> for product and provide recovery of up to 0.3 gallons per week. This rate of recovery could <br /> likely be improved using a skimmer pump. <br /> GeoTrans <br /> 6 <br />