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MAN <br /> i , <br /> AIR 6THIPPIN <br /> The current air stripping system has been highly affective, but <br /> is becoming increasingly inefficient at the removal of the <br /> gasoline. The early projection of 100 gallons of gasoline <br /> i <br /> spilled is obviously inaccurate because more than 650 gallons <br /> t <br /> y have been recovered, <br /> fa <br /> The recent pumping test of zone 3 demonstrated that a large 'r <br /> enough cone of capture can be generated by one well to affect the <br /> F entire site. Therefore a groundwater <br /> recovery system can <br /> effectively control groundwater flow across the site, and can <br /> Ain <br /> f <br /> prevent the escape of free p p product and contaminated water from 4 <br /> p <br /> the site. It would be effective in combination with an air <br /> tea <br /> { stripping system. <br /> 1 . <br /> It is pot possible to estimate accurately how long air stripping <br /> would have to continue, but it seems reasonable that many more <br /> years may be required. Ire addition, air stripping does not � <br /> recover the material adsorbed onto the soil at the interface of. ! <br /> the vadvse and saturated zones. To enhance this process, it I <br /> d S <br /> .'i. would seem appropriate pp opriate to add to the current program. � <br /> h M1. Sail..venting.is 'a recently developed technique by which a vacuum i <br /> is pulled on the contaminated region and volatiles from the <br /> { <br /> 1 un"turated zone are extracted. The extracted contaminants_are_________ <br /> tom. � - ,- ----- - _.-- ---- ---- - ------- ------- ----- <br /> then either released directly to the atmosphere or recovered by f :. <br /> } L an appropriate technique such as carbon adsorption or <br /> + E" distillation. This method is useful in highly permeable,- <br /> F 21. <br /> - - Z <br /> i <br /> S <br />