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-4- <br /> outside residential buildings and 45 dB inside residential <br /> buildings. <br /> 8 . In all of our operations, we will minimize the disruption to <br /> the Alden Park neighborhood. <br /> Alden Park Mitigation: Phase One <br /> Conclusions From Field Tests <br /> The results of the tests of liquids pumping and bioventing are <br /> described in detail in the mitigation plan ( 6) . Liquids pumping <br /> recovered only about 0 . 3 gal ./day of oil in most areas of the <br /> park . As a result, liquids pumping alone is not a practical <br /> mitigation process. <br /> Bioventing did remove oil at a practical rate. However , a high <br /> vacuum was required to obtain enough airflow, and this compli- <br /> cates the process somewhat . High vacuum in the bioventing well <br /> causes the well to fill up with water, and this blocks the flow <br /> of air . This effect is similar to drinking with a straw. The <br /> problem can be solved by combining the liquids pumping and bio- <br /> venting processes in a single well . The field tests showed that <br /> this combined process of liquids pumping and bioventing was the <br /> best mitigation process for Alden Park. <br /> Mitigation Schedule <br /> In the first phase of the Mitigation Plan we will add liquids <br /> Pumping equipment to the existing bioventing well . Mitigation <br /> will begin with this well which is located in the Green Belt on <br /> the North side of Alden Park . We plan to begin operation by <br /> September 1, 1989 . While this mitigation is proceeding, we will <br /> gather additional design data and begin design of a full-scale <br /> system. The full-scale system will be installed in 1990 . <br /> Process Description: Combined <br /> Liquids Pumping and Bioventin <br /> Figures 2 and 3 show a block flow diagram of the combined liquids <br /> pumping and bioventing processes. New equipment is identified in <br /> the drawings. Figure 1 shows the existing bioventing well . We <br /> will strengthen the bentonite seal at the top of the well to <br /> accommodate the higher vacuum. We will also install a submerged <br /> pump. This pump uses compressed air to push groundwater and oil <br /> up to the surface for treatment . The main purpose of the sub- <br /> merged pump is to keep the well clear of water so air can flow <br /> through the well. <br /> The process can be described by following the flow of each stream <br /> in Figures 2 and 3 . The air flows from the atmosphere, through <br /> the soil, and into the well. Air then flows through underground <br />