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90343TEXT CON-8 <br /> would be dictated by the extent of visible contamination. Implementation <br /> of these actions would, however, require the removal or relocation of the <br /> existing oil storage tanks. Because the tanks are scheduled to be removed <br /> in six months and due to the apparent low migration potential , we feel that <br /> delaying soil removal until then should not pose any significant problems <br /> provided operation of the oil recovery system is installed. The surface <br /> can also be covered with plastic to reduce infiltration of rainwater. <br /> In the event that cleanup of the soil must be conducted prior to the <br /> scheduled tank removal , it may be possible to remove much of the oil by in <br /> situ treatment. This would involve flushing the contaminated soil with <br /> biodegradable ionic and non-ionic surfactants. Flushing would be achieved <br /> by flooding the containment area with a dilute surfactant solution and <br /> allowing it to percolate through the soil . The resulting <br /> oil/water/surfactant mixture would be recovered by pumping from MW-14. The <br /> mixture can then be processed through the oil/water separator and water <br /> treatment plant. Additional sampling and analysis will be necessary to <br /> confirm the effectiveness of the flushing. It should be noted that this <br /> technique is still in the experimental stages but has been used <br /> successfully on subsurface gasoline spills. <br /> I <br />