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This interim final cover is being placed over the existing Class III operation area <br /> at the existing Austin Road Landfill to mitigate existing infiltration concerns. <br /> Additional Class III waste will be placed above the interim final cover within and <br /> above the existing Austin Road Landfill Class III footprint as discussed in Section <br /> 5.2.5. The south, east and west slopes will be placed at 3:1 (horizontal to <br /> vertical) slope ratios. The north slope will be placed at 4:1. An intermediate <br /> liner system will be placed on the proposed south slope face of the existing <br /> Austin Road Landfill Class III waste placement to serve as a liner for placement of <br /> Class II refuse (see Section A on Drawing 8). The interim final cover and <br /> intermediate liner interface detail is shown on Drawing 8. <br /> 5.2.2.4 INTERMEDIATE LINER SYSTEM <br /> The intermediate liner system that will be constructed over the future south <br /> slope of the Class III waste placement in the existing Austin Road Landfill Class III <br /> waste disposal area will consist of (from bottom to top) (see Detail 3 on <br /> Drawing 6): <br /> • 1-foot of existing refuse cover soil; <br /> • 1-foot of additional foundation soil; <br /> • A 24-inch thick low permeability soil (minimum permeability of 1 x 10-' <br /> cm/sec); <br /> • A 60-mil HDPE geomembrane (textured); <br /> • Drainage geocomposite; and <br /> • A 12-inch thick protective cover soil layer. <br /> A drainage geocomposite will collect leachate above the intermediate liner and <br /> transport leachate down-gradient to the base liner LCRS system, with eventual <br /> discharge to the site's leachate ponds. The limits of the intermediate liner will <br /> include the south slope face of the proposed Class III waste placement on the <br /> Austin Road Landfill area. The north, west and east slopes of the existing Austin <br /> Road Landfill will not be lined since only Class III wastes have been placed in <br /> that area. <br /> 5.2.3 FINAL GRADING <br /> The final grade configuration for the Forward Landfill will consist of top deck <br /> Forward Landfill)TD 5-4 <br /> L:\Allied\2000-193\Reports\JTD-PCPCh4Pi 02:Sec-5.0:5/24/02 <br /> Revision 1:07/161/02 <br /> BRYAN A.STIRRAT S ASSOCIATES <br />