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CI <br />u <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 51.01ft/yr for the second quarter and was calculated as <br />follows: <br />V = 10,100 ft/yr (0.0015 ft/ft) <br />0.30 <br />= 51.01 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 -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 />Harney Lane Sanitary Landfill G-2 Department of Public Works/Solid Waste <br />1s` Semester 2012 Groundwater Monitoring Report County of San Joaquin — July 31, 2012 <br />