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Ci <br />i� <br />i <br />u <br />value of 9.8 x 10-3 cm/s was selected because it would produce the greatest groundwater <br />velocity. The hydraulic gradient for the first quarter 2007 was calculated by dividing the <br />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 (1,050 ft). An average <br />porosity value of 0.3 was used, based on published porosity values for similar geologic materials. <br />Foothill Sanitary Landfill Public Works/Solid Waste <br />1" Semester 2007 Groundwater Monitoring G_2 County of San Joaquin — July 31, 2007 <br />