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distance between the two elevations in the direction of groundwater flow (475 ft). An average <br />porosity value of 0.3 was used, based on published porosity values for similar geologic materials. <br />E <br />Foothill Sanitary Landfill Department of Public Works/Solid Waste <br />I" Semester 2011 Groundwater Monitoring County of San Joaquin — July 31, 2011 <br />