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difference in groundwater elevations between contour lines 56.00 and 54.00 by the lateral <br />distance between the two elevations in the direction of groundwater flow (530 ft). An average <br />porosity value of 0.3 was used, based on published porosity values for similar geologic materials. <br />n <br />Ci <br />I <br />I <br />u <br />0 <br />Foothill Sanitary Landfill Department of Public Works/Solid Waste <br />1" Semester 2009 Groundwater Monitoring County of San Joaquin — July 31, 2009 <br />