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5.3.2.4 Precipitation and Drainage Control <br />The modules will be designed and constructed to limit ponding, infiltration, <br />inundation, erosion, slope failure, washout, and overtopping. <br />Diversion and drainage facilities will be designed, constructed, and maintained <br />to accommodate the anticipated volume of precipitation and peak flows from <br />surface runoff, prevent surface erosion,control and intercept run-on, and take <br />into account planned final designs, in accordance with applicable regulations. <br />5.3.3 Climatological Factors <br />• Climatological factors affect the following aspects of landfill design: <br />• The leachate collection and recovery system is designed to remove twice <br />the anticipated leachate production, which occurs in the first year of a <br />® Module's use based on rainfall. <br />• Drainage designs use local rainfall data as basis for system sizing. <br />• Evapotranspirative closure cap design considered rainfall in its design. <br />5.3.4 Seismic Design <br />The units will be designed to withstand the maximum probable earthquake (MPE) <br />without damage to the structures that control leachate, storm water, erosion, or gas, <br />in accordance with applicable regulations. <br />The stability of the landfill was investigated in 2002 by Shaw Environment and <br />Infrastructure, concurrent with the design of Module 1. This evaluation found that <br />global slopes of 3.4 to 1 were stable when minimum shear strength parameters <br />were provided (Appendix F). This requirement is incorporated into the design <br />slopes of the landfill (Figure 6). In addition, it was estimated that the maximum <br />acceleration due to a seismic event would be 0.054g, much less than the calculated <br />• <br />Foothill Sanitary Landfill Page 19 of 57 Public Works/Solid Waste <br />Joint Technical Document County of San Joaquin — Revised 7/30/10 <br />