Laserfiche WebLink
® APPENDIX F <br /> GROUNDWATER DIRECTION AND FLOW RATE 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 = 0.0023 foot per foot (ft/ft) <br /> n = 0.30 <br /> The groundwater flow velocity was 79.21 ft/yr for the first quarter and was calculated as follows: <br /> V 10,100 ft/yr (0.00235 ft/ft) <br /> 0.30 <br /> = 79.21 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 F-1 Department of Public Works/Solid Waste <br /> I"Semester 2013 Groundwater Monitoring Report County of San Joaquin—July 15,2013 <br />