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GROUNDWATER GRADIENT AND VELOCITY <br /> Data collected on August 28, 1993 indicates the groundwater beneath <br /> the landfill site flows easterly toward the Stockton pumping <br /> depression. <br /> The average flow velocity was calculated using Darcy's Law: <br /> Velocity = Conductivity x Hydraulic Gradient <br /> Porosity (per cent) <br /> The groundwater gradient was determined from the ground water <br /> contour map (see enclosed plat) using water levels obtained in <br /> August 1993 . The calculated gradient equal 0. 00736 feet/feet. <br /> Porosity was estimated at 30 per cent based on a published range <br /> data (Freeze and Cherry) . The range of hydraulic conductivity for <br /> the shallow water-bearing zone was determined to be between 0. 00094 <br /> cm/sec to 0. 015 cm/sec. Using the above data and equation, it was <br /> determined that the ground water flow velocity ranged between to <br /> 23 .8 to 380. 8 feet per year. <br /> ,.Q 4�ESSlpygf <br /> F Uk& <br /> lon <br /> No. 26987 <br /> EXP 3-3h97 <br /> OF OR <br />