COMPLIANCE INFO_AMENDED JTD 1/5/2026

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Foothill Sanitary Landfill Page 25 of 52 San Joaquin County DPW - Solid Waste Joint Technical Document Revised 01/05/2026 5.6. Drainage County will design and construct temporary surface water drainage features to control runoff and erosion as needed to control drainage as the landfill develops. Erosion will also be controlled by establishing vegetation. Final surface configuration will include drainage berms or benches to direct storm water away from refuse fill areas to the existing storm water facilities (Appendix B). Planned drainage facilities and features for the site (Appendix C) were sized using a peak flow from a 100-year occurrence storm. The Rational Method was used for design. With this method, the design storm duration is set equal to the time of concentration for the longest flow path. This is assumed to be the time at which peak flow occurs. Detention basins will be constructed on the east side of the landfill. 5.7. Construction Sequencing Plans 5.7.1. General The County intends to continue expansion of the landfill footprint with the addition of Modules within a 200-foot setback from the current property boundaries. The Foothill Sanitary Landfill is currently planned to be developed in approximately ten modules in order of numbering (Module 1, then Module 2, etc.) (Figure 5). Because sizing of the modules is dependent on operational and financial issues the County may revise the actual size or number of modules. The County will prepare and submit detailed design plans for each module to the appropriate regulatory agencies for review prior to construction. The refuse fill height for each module will be assessed during the design of each module based on refuse slope stability and conformance to the final landfill contours. Geometric constraints, such as adequate top deck size for truck traffic and potential soil stockpiling, will be evaluated.