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1 <br /> Pilot Testing Report and Conceptual Corrective Action Plan July 15, 1994 <br /> Manna Pro, 4004 South EI Dorado, Stockton, CA 26 <br /> Figure 10, a maximum flow rate of 2 2 gpm per well can be expected With three extraction wells, <br /> pumping at a flow rate of 2 2 gpm per well, the groundwater recovery rate will exceed the calculated <br />' natural flaw of groundwater across the impacted area of the property indicating a net flow of <br /> groundwater from the aquifer to the treatment system <br /> 1 Figure 12 illustrates the calculated capture zone over a period of one year for wells being pumped at <br />' a flow rate of 2 2 gpm each to indicate the optimum orientation of three groundwater recovery wells <br /> Comparison of this figure to the dissolved-phase TPH isoconcentration map shown in Figure 10 <br /> reveals that hydrocarbon impacted groundwater on the Manna Pro property will be contained and <br />' subsequently captured <br />' A discussion of the computer model used to determine the capture zone is discussed in <br /> Section 5 1 4 The computer model assumed a confined aquifer thickness of 10 feet with <br /> groundwater flow to the north at 0 004 feet per feet The capture zones were configured based on a <br /> one year elapsed period of remediation Two additional extraction wells are proposed downgradient <br /> of existing well EW-1 to accomplish groundwater capture throughout the impacted areal extent of <br /> the saturated zone <br /> One pore volume within the impacted area of the aquifer contains approximately 2,375,000 gallons <br /> based on the following equation <br />' 330 feet * 370 feet * 10 feet * 7 48 gal /ftp * 0 26 = 2,375,000 gallons <br /> The preceding equation assumes an impacted area 330 feet by 370 feet, a 10-foot4hick aquifer, and <br /> an estimated 26 percent porosity <br /> While extracting groundwater from three extraction wells at a projected rate of 6 6 gpm, <br />' approximately 3,470,000 gallons of groundwater can be removed per year based on the following <br /> equation <br />' 6 6 gpm * 1,440 min/day * 365 day/yr = 3,469,000 gallons <br />' 2819RO34 070 <br /> EGROUNDWATER <br /> T' TECHNOLOGY, INC <br />