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<br /> <br />Foothill Sanitary Landfill Page 25 of 53 San Joaquin County DPW - Solid Waste <br />Joint Technical Document Revised 6/09/2020 <br /> <br />Planned drainage facilities and features for the site (Appendix C) were sized using a peak flow <br />from a 100-year occurrence storm. The Rational Method was used for design. With this <br />method, the design storm duration is set equal to the time of concentration for the longest flow <br />path. This is assumed to be the time at which peak flow occurs. Detention basins will be <br />constructed on the east side of the landfill. <br /> <br />5.7. Construction Sequencing Plans <br /> <br />5.7.1. General <br />The County intends to continue expansion of the landfill footprint with the addition of Modules <br />within a 200-foot setback from the current property boundaries. <br /> <br />The Foothill Sanitary Landfill is currently planned to be developed in approximately ten modules <br />in order of numbering (Module 1, then Module 2, etc.) (Figure 5). Because sizing of the <br />modules is dependent on operational and financial issues the County may revise the actual size <br />or number of modules. The County will prepare and submit detailed design plans for each <br />module to the appropriate regulatory agencies for review prior to construction. <br /> <br />The refuse fill height for each module will be assessed during the design of each module based <br />on refuse slope stability and conformance to the final landfill contours. Geometric constraints, <br />such as adequate top deck size for truck traffic and potential soil stockpiling, will be evaluated. <br /> <br />The grading plans for Modules 1 and 2 include bringing the refuse to near the permitted <br />elevation. Grading plans for other Modules will be prepared as needed to address drainage <br />issues of these Modules and to guide the landfill operator in the placement of refuse. These <br />intermediate Plans will coordinate with the final grading plan (Appendix B). <br /> <br />5.7.2. Excavation and Stockpiling <br />The design of each module’s construction will include an excavation plan and stockpile plan as <br />needed. Excavation plans include the earthwork slopes and base grades, liner limits, LCRS <br />systems, perimeter berms, haul ramps, drainage ditches, storm water basins, and locations of