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f� <br /> :. � water table depression purr (WTDP) with teflon <br /> seals and will be installed as per specifications <br /> i ; <br /> determined by a pump test conducted on the <br /> recovery well. A float sensor probe electroni- <br /> cally connected to the WTDP will be set at a depth <br /> ' necessary to sustain the required cons of depres- <br /> sion within the. recovery well. An Oil Recovery <br /> Systems Probe Scavenger Unit will be installed in <br /> w. the well to collect any free product accumulation. <br /> A conductivity/float probe electronically connected <br /> to the Probe Scavenger will automatically start <br /> the product pump when the product thickness within <br /> the recovery well is greater than .20 feet. The <br /> recovered free product will be pumped directly <br /> into the existing 10,000 gallon underground <br /> storage tank (tank no. 1) which previously <br /> - dispensed unleaded gasoline. A tank full <br /> sensor will automatically shut down the <br /> product recovery pump should the recovery tank <br /> become full. All components of the pumping system <br /> are suitable for applications described with <br /> Fin <br /> respect to the potentially explosive environment. <br /> 3. Subsequent to obtaining permits, an air stripping water <br /> }- treatment unit will be constructed to replace the <br /> existing carbon filtration system, which was install to <br /> expedite the startup of the initial pumping program. <br /> This dedicated water treatment unit will consist of an <br /> Oil Recovery Systems air stripping tower designed to <br /> accommodate the anticipated flows and contaminant <br /> concentrations. The enclosed air stripper schematic <br /> graphically depicts the design of a typical air <br /> stripping unit (See Figure 5) . Due to the existing <br /> groundwater chemistry the pumped groundwater will be <br /> pretreated by injection of dilute sulfuric acid to <br /> 9 <br />