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PROBLEM ASSESSMENT REPORT Moore Petrolem, Inc. 1399 E. Yosemite Avenue, Manteca, CA NGA Project No. 10-90-480 Page 15 Dream was used to model the effectiveness of a ground-water remediation system using well MW-lA as an extraction well. Input - parameters for Dream are shown in Table 6. TABLE 5 DREAM Input Parameters Pumping well MW-1A Pumping Rate 0.35 GPM Aquifer 63 gallons/day/foot Transmissivity j Natural Ground-Water 0.001 foot/foot Gradient Aquifer Thickness 15 feet Aquifer Porosity 0.10 (estimated) ` Examination of the table of drawdown generated by DREAM for a pumping rate of 0.35 gpna indicates that this pumping rate is could likely be maintained by the aquifer. Figure 8 shows ground water flowlines generated by DREAM for this ground--Mater remediation scenario. Examination of Figure 8 indicates that pumping MW-1A at a rate of 0.35 gpm should easily capture the interpreted extent of dissolved hydrocarbons and prevent further migration of the dissolved plume. Figure 9 is a contour map of ground-water travel times prodvged by pumping MW-1A. Figure 9 indicates that shows that the northernmost extent of the dissolved plume of hydrocarbons would reach MW-1A in less than 200 days, and the majority of the plume reaching MW-1A in 50-100 days. - Because 3f adsorption and desorption of hydrocarbon constituents by aquifer materials (particularly fine-grained sediments and organic material) , it is likely that petroleum constituents will --___migrate somewhat-slower_than ground water. _A_conservative estimate of the relative rate of movement of dissolved petroleum constituents compared to the rate of ground-water movement would probably be aratio of about 1.5 to 1.0 (i.e., }petroleum constituents will migrate 1.5 times slower than ground water) .