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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 /> The groundwater flow velocity was 74.81 ft/yr for the second quarter and was calculated as <br /> follows: <br /> V = 10,100 ft/yr (0.00222 ft/ft) <br /> 0.30 <br /> = 74.81 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 F-2 Department of Public Works/Solid Waste <br /> I"Semester 2013 Groundwater Monitoring Report County of San Joaquin—July 15,2013 <br />