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difference in groundwater elevations between contour lines 52.00 and 50.00 by the lateral <br /> distance between the two elevations in the direction of groundwater flow(875 ft). An average <br /> porosity value of 0.3 was used,based on published porosity values for similar geologic materials. <br /> Foothill Sanitary Landfill Department of Public Works/Solid Waste <br /> 2nd Semester and Annual 2013 Groundwater Monitoring County of San Joaquin—January 31,2014 <br />