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11 <br />C <br />difference in groundwater elevations between contour lines 46.00 and 44.00 by the lateral <br />distance between the two elevations in the direction of groundwater flow (900 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 2012 Groundwater Monitoring County of San Joaquin — January 15, 2013 <br />