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® APPENDIX G <br />GROUNDWATER DIRECTION AND FLOW T CALCULATIONS <br />Groundwater elevations in the monitoring wells are obtained quarterly. These measurements are <br />used to define the direction and gradient of groundwater flow in the vicinity of the Harney Lane <br />Sanitary Landfill. The average groundwater velocity in this area was calculated using the <br />following equation (Darcy's Law): <br />V = Ki <br />n <br />V = maximum linear velocity <br />K = permeability <br />i = hydraulic gradient <br />n = porosity <br />K = 9.8 x 10-3 centimeters per second (cm/s) <br />= 10,100 feet per year (ft/yr) <br />i = 0.0021 foot per foot (ft/ft) <br />n = 0.30 <br />The groundwater flow velocity was 70.87 ft/yr for the third quarter and was calculated as follows: <br />V = 10,100 ft/yr (0.00210 ft/ft) <br />0.30 <br />= 70.87 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 />Harney Lane Sanitary Landfill G-1 Department of Public Works/Solid Waste <br />2nd Semester and Annual 2012 Groundwater Monitoring Report County of San Joaquin - January 25, 2013 <br />