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Mr. Dave Lewis October 13, 1986 Page 5 The installation of a water filtration system should not be initiated until recovery of all free phase product has been . accomplished. This is because the injection of water may tend to drive the free product away from its present location and collection points. Once the free product is recovered, the capture zone of the pumping well would have to be determined to assure that the injection of water would not inadvertently push the dissolved contamination further from the area of highest contamination. Although a relatively common approach the. effectiveness of converting soil contamination to water contamination which is then pumped to the surface for treatment may not be the most efficient way to address the problem. Such systems often require extended periods of time to achieve significant results. Preli- minary installation and operational cost estimates for a closed loop the water filtration system are presented below. Option 3 Pumping/Injection System Installation . . . . . . , . . . . . 32,000.00 System Design and Permitting . . . . . . . . . . . . . . . . . . . . . 7,000.00 Professional Services . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5,000.00 TOTAL $44 ,000.00 Monthly Cost System Monitoring and Maintenance 2,200.00 . Option 4. Enhanced Natural Degradation (END) - The in-situ . treatment of hydrocarbon contamination by the stimulation of - indigenous hydrocarbon consuming microorganisms is an effective solution to reducing the existing 'soil contamination. Based on analysis of water and soil samples the type and quantity of indigenous microbes are determined. To optimize the growth of the hydrocarbon utilizing microbes laboratory tests determine the required nutrients and necessary oxygen supply. A closed loop