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A. Perform an aerial survey of the site. <br /> is B. Provide a topographic map with a maximum <br /> contour interval of two feet. <br /> C. Provide an iso-settlement map showing the change in <br /> elevation from the map produced at the time of closure <br /> and the most recent topographic map with a maximum <br /> contour interval of two feet. <br /> 10. FINAL SITE FACE <br /> Final landfill slopes will be vegetated with Bromme grass upon <br /> placement of the vegetative soil layer. The vegetation will help <br /> stabilize slopes and reduce erosion. The rooting depth of the <br /> grass will not exceed the thickness of .the one foot vegetative <br /> cover layer so the clay layer will not be disturbed. The <br /> vegetation will be seeded at the beginning of the rainy season, so <br /> no irrigation will be necessary. <br /> A slope stability analysis, dated January 3, 1992, was performed by <br /> Kleinfelder Inc. and is enclosed in this Closure Plan as Appendix <br /> B. <br /> 1. INSTALLATION OF DRAINAGECONTROL <br /> The proposed drainage facilities are designed in accordance with <br /> the County of San Joaquin Department of Public Works, Manual for <br /> Storm Drainage Design (January 1973) , except that the drainage <br /> facilities at the landfill are sized to accommodate the volume and <br /> peak flow rate expected from a storm having a 100 year-24 hour <br /> frequency instead of the 10 year frequency. The intensity-duration <br /> curve for the 100-year rainfall was developed from data for the <br /> Stockton Disposal Plant as provided in the National Oceanographic <br /> and Atmospheric publication, Precipitation - Frequency Atlas of the <br /> Western United States (1973) . A copy of the intensity-duration <br /> curve is included with the drainage calculations located in <br /> Appendix D. The computations of peak flow are based upon the <br /> Rational Method formula, Q = CAI, where C is the coefficient of <br /> runoff, A is the area, and I is the rainfall intensity. <br /> The final grade of the cover over the landfill shall be at a <br /> minimum slope of 3 percent as required by the regulations. Storm <br /> water runoff from the top of the landfill and the maintenance road <br /> will be directed to the drainage ditch system that encircles the <br /> top of the landfill. The drainage ditch will be typically graded <br /> at 0. 2 percent toward downdrains located approximately every 400 <br /> feet around the landfill. <br /> 9 <br />