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The drainage features described in the Preliminary Closure and Postclosure Maintenance Plan <br />(PCPCMP) (Appendix B) were sized using a peak flow from 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. Currently, stormwater flows in the directions shown on Plate 3. <br />The storm water collects in the depressed areas from which soil is excavated in preparation for <br />the next modules. This water is pumped from those depressed areas into surface drainage <br />features, generally for delivery to the interim sedimentation pond (Plate 3 and Appendix B). <br />The following facilities have been or will be designed to accommodate a 100 -year 24-hour storm <br />event: <br />• Off-site drainage entering the site <br />• On-site drainage structures <br />• Detention basin (s) <br />40 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 />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 />North County RC&SL Page 16 of 69 Public Works/Solid Waste <br />Joint Technical Document County of San Joaquin — February 10, 2010 <br />