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Pilot Testing Report and Conceptual Corrective Action Plan July 15, 1994 Manna Pro, 4004 South EI Dorado, Stockton, CA 25 one-year groundwater capture zone of approximately 460 feet by 360 feet at a combined pumping rate of about 6 6 gpm To address the areas detailed in Figure 11, the following remedial well field construction Is proposed at this time ' - 20 HVE Extraction Points • 3 Groundwater Pumping Wells A layout of the HVE extraction points (including the effective radii of influence of each point) and the groundwater pumping system conceptual layout (including flowlines Illustrating the combined one-year capture zone) is presented as Figure 12 A conceptual operating schematic of the combined groundwater pumping and HVE extraction system is provided as Figure 13 The HVE extraction points will be plumbed into a vacuum manifold and fed into the liquid rin9pump The HVE points will be adapted with a tee connection to allow vertical access to the points Vacuum gauges and flow meters will be used to regulate extraction rates and optimize system ' performance Design details will be addressed in the final system design A conservative estimate of the volume of water moving through the hydrocarbon impacted area of the Manna Pro property may be calculated using the average groundwater gradient measured from MW-4 to MW-8 on February 3, 1993 (0 004 feet/feet), the average conductivity of the aquifer as determined by the pumping test (74 gallons/day ft2), the maximum width of the impacted area perpendicular to groundwater flow direction (400 feet), and an impacted aquifer thickness of 10 feet Using these parameters in the Darcy flow equation indicates a maximum flow rate across the impacted area of the property of 1184 gpd or approximately 0 82 gpm With a drawdown of approximately 5 3 feet, one recovery well can be expected to yield approximately 1 3 gpm As an approximation, the yield of this well per linear foot of drawdown equates to 0 22 gpm/ft A drawdown of 10 feet in a recovery well can be expected to yield approximately 2 2 gpm To conservatively estimate the number of wells required to produce a ' negative net flow of groundwater across the hydrocarbon impacted zone of the property shown in ' zaysaoaa azo GROUNDWATER ' TECHNOLOGY, INC