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n <br />difference in groundwater elevations between contour lines 55.00 and 53.00 by the lateral <br />distance between the two elevations in the direction of groundwater flow (575 ft). An average <br />porosity value of 0.3 was used, based on published porosity values for similar geologic materials. <br />The hydrographs indicate a general decline of water levels from a high water level mark in 2000. <br />This appears to be a result of a general regional change in water level elevations. <br />Foothill Sanitary Landfill Department of Public Works/Solid Waste <br />2nd Semester and Annual 2010 Groundwater Monitoring County of San Joaquin — January 31, 2011 <br />