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Foothill Sanitary Landfill Page 18 of 52 San Joaquin County DPW - Solid Waste Joint Technical Document Revised 12/04/2025 Initial sizing, placement, and orientation of the landfill was done within the constraints offered by the physical settings. Drainage design was influenced by the surrounding surface watershed and drainage flow-paths. Module depth below the ground surface was influenced by the depth to groundwater and soil conditions. 5.3.2.3. Liners on Native Soil Future modules will be constructed with a soil operations layer, geotextile, drainage layer, LCRS systems, geomembrane, GCL, and prepared subgrade. Liners will be installed to cover all natural geologic materials where refuse will be placed. 5.3.2.4. Precipitation and Drainage Control The modules will be designed and constructed to limit ponding, infiltration, inundation, erosion, slope failure, washout, and overtopping. Diversion and drainage facilities will be designed, constructed, and maintained to accommodate the anticipated volume of precipitation and peak flows from surface runoff, prevent surface erosion, control and intercept run-on, and take into account planned final designs, in accordance with applicable regulations. 5.3.3. Climatological Factors The leachate collection and recovery system is designed to remove twice the anticipated leachate production. Rainfall data is used as the basis for sizing drainage facilities and ET closure caps. 5.3.4. Seismic Design The seismicity characterization provided in the 2015 JTD referenced a 2002 EMCON/OWT study. Because of new data in the earthquake catalogue, recent guidance documents, and new attenuation relationships, the 2002 EMCON/OWT analysis have been updated in the JTD Addendum (2012). The Foothill Sanitary Landfill is a Class III waste site, and as such Title 27 CCR requires that the waste containment units be designed to withstand at least the maximum probable