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distance between the two elevations in the direction of groundwater flow (550 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 />1*' Semester 2010 Groundwater Monitoring County of San Joaquin —July 21, 2010 <br />