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<br /> <br />Foothill Sanitary Landfill Page 18 of 52 San Joaquin County DPW - Solid Waste <br />Joint Technical Document Revised 01/05/2026 <br /> <br /> <br />5.3.2.2. Physical Setting <br />Initial sizing, placement, and orientation of the landfill was done within the constraints <br />offered by the physical settings. Drainage design was influenced by the surrounding surface <br />watershed and drainage flow-paths. Module depth below the ground surface was influenced by <br />the depth to groundwater and soil conditions. <br /> <br />5.3.2.3. Liners on Native Soil <br />Future modules will be constructed with a soil operations layer, geotextile, drainage <br />layer, LCRS systems, geomembrane, GCL, and prepared subgrade. Liners will be installed to <br />cover all natural geologic materials where refuse will be placed. <br /> <br />5.3.2.4. Precipitation and Drainage Control <br />The modules will be designed and constructed to limit ponding, infiltration, inundation, <br />erosion, slope failure, washout, and overtopping. <br /> <br />Diversion and drainage facilities will be designed, constructed, and maintained to <br />accommodate the anticipated volume of precipitation and peak flows from surface runoff, <br />prevent surface erosion, control and intercept run-on, and take into account planned final <br />designs, in 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 <br />EMCON/OWT study. Because of new data in the earthquake catalogue, recent guidance <br />documents, and new attenuation relationships, the 2002 EMCON/OWT analysis have been <br />updated in the JTD Addendum (2012). <br />