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<br /> <br />Foothill Sanitary Landfill Page 18 of 53 San Joaquin County DPW - Solid Waste <br />Joint Technical Document Revised 6/09/2020 <br /> <br /> <br />5.3.2.4. Precipitation and Drainage Control <br />The modules will be designed and constructed to limit ponding, infiltration, inundation, erosion, <br />slope failure, washout, and overtopping. <br /> <br />Diversion and drainage facilities will be designed, constructed, and maintained to accommodate <br />the anticipated volume of precipitation and peak flows from surface runoff, prevent surface <br />erosion, control and intercept run-on, and take into account planned final designs, in <br />accordance with applicable regulations. <br /> <br />5.3.3. Climatological Factors <br />The leachate collection and recovery system is designed to remove twice the anticipated <br />leachate production. Rainfall data is used as the basis for sizing drainage facilities and ET <br />closure caps. <br /> <br />5.3.4. Seismic Design <br />The seismicity characterization provided in the 2015 JTD referenced a 2002 EMCON/OWT <br />study. Because of new data in the earthquake catalogue, recent guidance documents, and new <br />attenuation relationships, the 2002 EMCON/OWT analysis have been updated in the JTD <br />Addendum (2012). <br /> <br />The Foothill Sanitary Landfill is a Class III waste site, and as such Title 27 CCR requires that the <br />waste containment units be designed to withstand at least the maximum probable earthquake <br />(MPE) without experiencing damage to the structures that control leachate, storm water, <br />erosion, or gas, in accordance with applicable regulations. <br /> <br />In 2002 EMCON/OWT investigated the stability of the landfill design of Module 1 and concluded <br />that the 3.5 to 1 (H:V) global slopes were stable when minimum shear strength parameters were <br />used (Appendix F). CBI, Inc. performed an updated slope stability analysis for the Foothill <br />Sanitary Landfill (reference Appendix L). In the stability analysis one critical global section <br />based on the Landfill’s final grading plan was investigated under dynamic conditions using the <br />peak ground acceleration in rock based on the site specific MPE . Interim waste slopes were