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i <br /> i <br /> (C) 1989 BIO NATIONAL CORPORATION <br /> 6.2 SYSTEM DESXGN <br /> The system is designed to gently introduce moisture to the gravelly <br /> BIO/100 microbe packed zones of the venting biowells. The ranting <br /> biowells are wetted to allow capillary action and negative pressure from the , <br /> vapor extraction unit to draw the BIO/100 microbes and nutrients into the <br /> zone of contamination. <br /> •r <br /> Where groundwater impart is significant, and to accelerate treatment by <br /> both in situ and surface activity, the venting biowells are each equipped to <br /> withdraw excess bottom fluids, such as groundwater or inoculum. Each <br /> biowell is bottom sealed by a bentonite clay plug to minimize gravity <br /> induced migration. Excess inoculum will be pumped out of both venting <br /> and extraction wells, and treated in the bioreactor units and/or ozone <br /> stripper. i <br /> i <br /> The nominal horizontal zone of influence for capillary action is estimated to <br /> be 3-5 feet from the axis of the biowell. With inducement of negative <br /> pressure from the vapor extraction well in the renter of the plume, 12-18 i <br /> feet away, (100 cfm positive displacement Pumps can draw varors from as <br /> much as 40 feet away in sandy soils), this moisture carries microbes into <br /> the full zone of contamination, alloying a saturation goal of 60% in the <br /> vicinity of the venting biowell, to less than 10% at the extraction well. <br /> The venting biowells each have top "dribbling" and bottom extraction <br /> tubes. Each well will then be gradually fed inoculum over a period of ten ti <br /> w puddling ani extension of the pluma by <br /> to twelve days, bile controlling p - <br /> ..� hydraulic forces. <br /> The inoculum, dribbled into the venting biowells, will respond to the <br /> s <br /> negative pressure from the extraction wells at the center. i <br /> ,i <br /> f <br /> 8 HOLT805 <br /> , f <br />