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North County RC&SL Page 15 of 64 Public Works/Solid Waste <br />Joint Technical Document County of San Joaquin – Revised July 14, 2025 <br />The drainage features described in the Preliminary Closure and Postclosure Maintenance Plan <br />(PCPCMP) (Appendix B) were designed to accommodate a 100-year 24-hour storm event. The <br />PCPCMP includes 12-foot wide drainage channels along the landfill perimeter to handle storm <br />water runoff from the landfill. <br /> <br />Most rainwater is delivered to the Interim Sedimentation Pond. Other storm water collects in the <br />depressed areas from which soil is excavated in preparation for the next areas. This water is <br />pumped from those depressed areas into surface drainage features, generally for delivery to the <br />interim sedimentation pond (Plate 3 and Appendix B). <br /> <br />4.2.6 Wind Rose <br />The mean annual wind speed is 8.3 miles per hour in a westerly direction (Plate 11). Monthly <br />predominant wind direction varied between southeast in January, February, and December and <br />west during the remaining months. <br /> <br />4.3 GEOLOGY <br />Information presented in this Section is based on the Geologic and Hydrogeologic Report, <br />Proposed Landfill Development Site, San Joaquin, County, California, dated September 1987, <br />revised January 1988 and recent landfill gas probe and groundwater monitoring well boring logs <br />(Appendix C). <br /> <br /> 21750(f) of Title 27 requires dischargers to assess the geologic condition of the site including: <br /> <br />• The geologic setting <br /> <br />• Faults, seismicity, and seismic hazards <br /> <br />• Groundwater hydrogeology <br /> <br />