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11 <br />elevations -37.00 feet and -38.00 feet by the distance between lines measured in the direction of <br />flow. An average porosity value of 0.3 was used, based on published porosity values for similar <br />geologic materials. <br />The groundwater flow velocity was 71.63 ft/yr for the fourth quarter and was calculated as follows: <br />V = 10 100 ft/yr (0.00212 ft/ft,) <br />0.30 <br />= 71.63 ft/yr <br />The permeability coefficient was determined with a slug test in well G-1 at the North County <br />Recycling Center and Sanitary Landfill to be 9.8 x 10-3 cm/s. Well G-1 at North County monitors <br />similar soil types at the equivalent horizon as the water -bearing zone beneath the Harney Lane <br />Sanitary Landfill. The hydraulic gradient was calculated by dividing the difference in groundwater <br />elevations -38.00 feet and -39.00 feet by the distance between lines measured in the direction of <br />flow. An average porosity value of 0.3 was used, based on published porosity values for similar <br />geologic materials. <br />Harney Lane Sanitary Landfill G-2 Department of Public Works/Solid Waste <br />2nd Semester and Annual 2012 Groundwater Monitoring Report County of San Joaquin — January 25, 2013 <br />