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® The following facilities are designed to accommodate a 100 -year storm event: <br />• Off-site drainage entering the site <br />• On-site drainage structures <br />• Detention basin(s) <br />U <br />5.7. Construction Sequencing Plans <br />5.7.1 General <br />The County intends to continue expansion of the landfill footprint with the addition of <br />Modules within a 200 -foot setback from the current property boundaries. <br />The Foothill Sanitary Landfill is currently planned to be developed in approximately <br />ten modules in order of numbering (Module 1, then Module 2, etc.) (Figure 5). <br />Because sizing of the modules is dependent on operational and financial issues the <br />County may revise the actual size or number of modules. The County will prepare <br />and submit detailed design plans for each module to the appropriate regulatory <br />agencies for review prior to construction. <br />The refuse fill height for each module will be assessed during the design of each <br />module based on refuse slope stability and conformance to the final landfill <br />contours. Geometric constraints, such as adequate top deck size for truck traffic <br />and potential soil stockpiling, will be evaluated. <br />The grading plan for Module 1 includes bringing the refuse to near the permitted <br />elevation. Grading plans for other Modules will be prepared as needed to address <br />drainage issues of these Modules and to guide the landfill operator in the placement <br />of refuse. These intermediate Plans will coordinate with the final grading plan <br />(Appendix B). <br />Foothill Sanitary Landfill <br />Joint Technical Document <br />Page 24 of 57 Public Works/Solid Waste <br />County of San Joaquin — Revised 7/30/10 <br />