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Attachment D <br /> GROUNDWATER FLOW DIRECTIONAND VELOCITY <br /> CALCULATIONS <br /> The groundwater monitoring network consists of five wells (MW-1, MW-2, <br /> MW-3, MW-4, and MW-5). Well SB-I was installed to provide additional water <br /> level data. Groundwater elevations in the monitoring wells were obtained on <br /> March 3, 1993. These measurements were used to define the direction and <br /> gradient of groundwater flow in the vicinity of the Corral Hollow Sanitary <br /> Landfill. Two water-bearing zones are monitored. The deep water-bearing zone is <br /> monitored by wells MW-1, -2, and MW-3. Deep zone water levels have <br /> dropped approximately 20 feet. Wells MW-1, MW-2, and MW-3 were dry; <br /> therefore, the groundwater flow calculations and contour map could not be <br /> prepared. The shallow water-bearing zone is a perched groundwater zone that is <br /> monitored by wells MW-4, -5, and SB-l. SB-1 is not sampled; it was <br /> installed to provide the third data point required for groundwater flow <br /> characterization. The average groundwater velocities in this area were calculated <br /> using the following equation (Darcy's Law): <br /> V = Ki <br /> n <br /> Where V = maximum linear velocity <br /> K = permeability <br /> i = hydraulic gradient <br /> n = porosity <br /> SAC/PJ003M39MIAbc-93 mm:6 D-1 Rev. 0 April 13, 1993 <br />