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modeling performed by Geologic Associates (GLA) (see Appendix D). Leachate <br /> is collected and discharged to the on-site leachate ponds. <br /> 5.2.2.2 SLOPE LINER SYSTEM <br /> The slope liner system consists of(from bottom to top) (see Details 2 and 4 on <br /> Drawing 6): <br /> • Prepared subgrade <br /> • A 24-inch thick low permeability`sn j'min mum permeability of <br /> 1 x 10' cm/sec) or GCL; <br /> • A 60 mil HDPE liner (single sided textured, textured side down); <br /> • A geocomposite drainageRn �S t); and <br /> • A 12-inch thick protective.cover soil layer. <br /> The geonet will extend over the entire siope area and vifl-tertninate within-the <br /> base liner, 1-foot thick LCRS drainage layer at a 5-foot offset from the toe of <br /> slope. The sideslope liner system will be anchored in a trench located at the top <br /> of the excavation slope. <br /> 5.2.2.3 INTERIM FINAL COVER <br /> The interim final cover system will consist of(from bottom to top) (see Detail 1 <br /> on Drawing 3): <br /> • Two-foot foundation layer consisting of- <br /> - Existing intermediate soil cover <br /> - One foot of additional foundation soil material <br /> • Either GCL or 12 inches of low-permeability soil (minimum permeability of <br /> 1 x 10' cm/sec); <br /> • 12-inch of vegetative soil layer; <br /> • 12-inch drainage gravel or drainage geocomposite. <br /> 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 /> Forward Landfill JTD 5-3 <br /> L:\Allied\2000.193\Reports\finaljtd:S ec-5.0:08/2 2/01 <br /> SQYAN A.SYMOAT S.ASSOCIATES <br />