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Permeability coefficients determined with a slug test in well G-1 ranged from 8.3 x 10-3 to 9.8 x <br />10-3 cm/s in the water -bearing zone beneath the landfill. The highest measured permeability <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 third quarter 2007 was calculated by dividing the <br />difference in groundwater elevations between contour lines 51.00 and 50.00 by the lateral <br />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 />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 water level elevation. <br />Foothill Sanitary Landfill Public Works/Solid Waste <br />2nd Semester and Annual 2007 Groundwater Monitoring G-2 County of tSan Joaquin — January 31, 2008 <br />j <br />I <br />I'I <br />ri <br />F <br />'J <br />J <br />r <br />G' <br />0 <br />