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5.2.5. The north, east and west slopes will be placed at 5:1 (horizontal to vertical) slope ratios. An intermediate liner system will be placed on the proposed south slope face of the existing Austin Road Landfill Class III waste placement to serve as a liner for placement of Class II refuse (see Section A on Drawing 8). The interim final cover and intermediate liner interface detail is shown on Drawing 8. 5.2.2.4 INTERMEDIATE LINER SYSTEM The intermediate liner system that will be constructed over the future south slope of the Class III waste placement in the existing Austin Road Landfill Class III waste disposal area will copsist,.of(from bottom to top) (see Detail 3 on Drawing 6): • 1-foot of existing refuse cover soil; • 1-foot of additional foundation soil; • A 24-inch thick low permeabilitysoil,(minimum-permeability of 1 X1C1-' cm/sec) or GCL; • A 60-mil HDPE geomembrane (textured); • Drainage geocomposite-, and • A 12-inch thick protective cover soil layer. A drainage geocomposite will collect leachate above the intermediate liner and transport leachate down-gradient to the base liner LCRS system, with eventual discharge to the site's leachate ponds. The limits of the intermediate liner will include the south slope face of the proposed Class III waste placement on the Austin Road Landfill area. The north, west and east slopes of the existing Austin Road Landfill will not be lined since only Class III wastes have been or will be placed in that area. 5.2.3 FINAL GRADING The final grade configuration for the Forward Landfill will consist of top deck gradients of 5 percent sloping toward top deck perimeter berms. The top deck berms will divert surface flows to down drains. Landfill slope runoff is also directed to downdrains via benches located at 50 foot maximum vertical Forward Landfill JTD 5-4 L:\AI lied\2000.193\Reports\finalj td:Sec-5.0:08/2 2/01 BRYAN A.STIRRAT S.ASSOCIATE£