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velocity. The hydraulic gradient for the first quarter 2008 was calculated by dividing the <br />difference in groundwater elevations between contour lines 49.00 and 48.00 by the lateral <br />distance between the two elevations in the direction of groundwater flow (250 ft). An average <br />porosity value of 0.3 was used, based on published porosity values for similar geologic materials. <br />11 <br />11 <br />11 <br />iJ <br />iJ <br />II <br />j <br />r] <br />�i <br />r <br />it <br />1 <br />Foothill Sanitary Landfill Department of Public Works/Solid Waste <br />1S` Semester 2008 Groundwater Monitoring County of San Joaquin — July 31, 2008 <br />