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through grassland to the water pond on landfill property (Plate 2.2). This sedimentation area did <br /> not overflow in the winter of 2004/2005. <br /> Planned drainage features for the developed site (Site Development Plan (SDP) in Appendix C) <br /> were sized using a peak flow from a 100-year occurrence storm. The Rational Method was used <br /> for design. With this method, the design storm duration is set equal to the time of concentration <br /> for the longest flow path. This is assumed to be the time at which peak flow occurs. Detention <br /> basins will be constructed on the east side of the landfill. <br /> The following facilities have been or will be designed to accommodate a 100-year storm event: <br /> • Off-site drainage entering the site <br /> • On-site drainage structures <br /> • Detention basin(s) <br /> 5.2.6. Wind Rose <br /> Wind direction, velocity, and percentage of time in the indicated direction for Stockton are <br /> shown on Plate 8. The Western Regional Climate Center was contacted for historical <br /> information. The closest station to the landfill was the Stockton Airport. The mean annual wind <br /> speed is 8.3 mph in a Westerly direction. Monthly predominant wind direction varied between <br /> southeast in January, February, and December and west during the remaining months. <br /> 5.3. GEOLOGY <br /> This section describes the regional and site geology and hydrogeology of the Foothill Landfill <br /> site. The information included is intended to meet the requirements of Section 21750(f) of <br /> Title 27, which requires dischargers to assess the geologic condition of the site to provide <br /> information relating to: <br /> • Geologic setting (geology, seismicity, engineering properties, and stability) <br /> • Hydrogeologic Setting (hydrogeology, hydraulic conductivity, groundwater flow, and <br /> quality) <br /> Foothill Sanitary Landfill Page 21 of 62 Public Works/Solid Waste <br /> JTD County of San Joaquin—Revised 10/6/05 <br />