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III.A.9. Representative Cross Five representative landfill cross sections are shown on Appendix B, Sections Drawing P5. These sections show the existing landfill, the CEP Dwg. P5 vertical and horizontal expansion phases, and the final landfill grade. Sections A, B, C, and D are cut north-south through a leachate collection trench and sump for Phases I, ll, III, and IV respectively. Section F is cut east-west through Phases I, ll, III, and IV showing the drainage slope to the leachate collection trenches, the top of the landfill is shown as a projection beyond the section cut. Sections show specific design elements of the liner, leachate collection system, cover system, surface water system are discussed in Section 1- below. III.A.10. Design Details 23 CCR 2542 (Liner Liner System: Liner system is a composite liner consisting of Appendix B, System) a 2 foot clay liner(max. permeability 1 x 10-7 cm/sec) overlaid CEP Dwg. P6 by a geomembrane. For final design, a geosynthetic clay liner Appendix I, FDSR (GCL) may be substituted for the 2 foot clay liner. See Sec. 1.3.3, Pages Drawing P6 for typical liner details. 1-8 to 1-9 14 CCR 17773, Final Cover - Existing Landfill: Final covering existing landfill Appendix B, 23 CCR 2581 (Final Cover) areas would consist of a 2-foot foundation layer and a 1-foot CEP, Dwg. P6 minimum soil barrier (max. permeability 1 x 10-6 cm/sec) with Appendix I, FDSR • a 1-foot minimum topsoil layer. Sec. 1.5.3 Page 1-17 Final Cover - Expansion Landfill: Final cover for expansion landfill areas will consist of a composite cover system an 18 inch foundation layer (max. permeability 1 x 10-6 cm/sec), a geomembrane, and an 18 inch soil cover layer. For final design, a geosynthetic clay liner (GCL) may be substituted for the low permeability foundation layer or the soil barrier layer. See Drawing P6 for typical cover details.