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-3- <br /> complete installation of a mitigation system by the middle of <br /> next year . <br /> The occurrence of oil in and around the Alden park area is dis- <br /> cussed briefly below. Please refer to the site assessment report <br /> for more detail (Reference 1) . Recommended mitigation is dis- <br /> cussed as well as justifications for the recommendation. <br /> Detailed Plans <br /> Liquid Oil <br /> Below Surface <br /> As indicated in the site assessment report (Reference 1 ) , liquid <br /> oil is trapped above the water table in locations under and <br /> around the perimeter of Alden Park . Although testing showed the <br /> oil is not hazardous, it may pose a problem to deep rooted trees <br /> and become a nuisance by flowing into deep excavations made in <br /> yards. <br /> We expect to use one of these two technologies , or both in combi- <br /> nation, to remove the nuisance of liquid oil : <br /> 1 . The first method involves pumping groundwater and oil to the <br /> surface, then separating the oil and water to recover the oil , <br /> and finally sending the water to treatment. <br /> 2 . A second method involves stimulating microorganisms that <br /> naturally occur in the shallow soil to biodegrade the oil trapped <br /> in the deeper soil above the water table. <br /> To determine the effectiveness of both of these technologies , we <br /> will perform pilot tests at Alden Park . Data from these tests <br /> and our interpretation of the applicability of these technologies <br /> to Alden Park will be made available to the Public Agencies in <br /> early 1988 . <br /> Liquids Pumping <br /> Groundwater pumping has been successful at other sites in remov- <br /> ing liquid oil floating on the water table. Figure 1 shows a <br /> cross-sectional view of a groundwater pumping system and how it <br /> draws the water surface down into a cone shape. This cone fills <br /> with oil which is pumped to the surface for recovery. <br />