ARCHIVED REPORTS_2013_8 - Laserfiche WebLink

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• Geocomposite drainage net(GDN); • One-foot thick protective operations layer to be placed concurrently with waste placement (maximum height of operations layer at any given time is 10 ft above refuse level) The liner and LCRS in the connection area between the WMU FU-08 North and WMU FU-13 consists of,from bottom to top: • Geogrid; • 60-mil,double-sided textured HDPE geomembrane liner; • Cushion geotextile; • One half-foot thick gravel blanket drainage layer with a minimum hydraulic conductivity of 0.1 cm/sec; • Nonwoven geotextile filter fabric; • One-foot thick protective operations layer; Connection, transition, termination, and anchorage details have been designed (see Construction Drawings, Appendix A)to maintain continuity among all components and to provide connection access for future systems. 5.1 Lining System As shown on the Construction Drawings(Appendix A),the WMU FU-13 base lining system will consist of a 2-foot-thick compacted, clay liner overlain by a 60-mil thick, double-sided textured HDPE geomembrane. The side slope liner will consist of a GCL overlain by a 60-mil thick, single-sided textured HDPE geomembrane.The base lining system meets the current prescriptive Title 27 regulations and complies with Forward's WDRs.The side slope liner is an engineered alternative that complies with Forward's WDRs and has been previously approved at the Forward Landfill for WMUs D-99, D-00,D- 01, D-02, FU-03, FU-04, FU-05, FU-06, FU-08, and FU-10. The interface liner is also an engineered alternative that complies with Forward's WDRs and has been previously approved at the Forward Landfill for WMUs D-94,D-97,D-98,D-99,FU-03,FU-04,FU-05,FU-06,FU-08,and FU-10. 5.1.1 Clay Liner The clay liner will be constructed to meet the Specifications included in Appendix C.It will consist of fine-grained soils with significant clay content and without organic matter. The material will have at least 30 percent of particles passing a No. 200 U.S. Standard sieve and be classified as SC (clayey sand), CL(lean clay, sandy or silty lean clay), or CH(fat clay, sandy or silty fat clay)by the Unified Soil Classification System (USCS). The clay liner will have a maximum field hydraulic conductivity of 1 x 10-7 cm/sec when compacted to a minimum relative compaction of 90 percent at a water content at least 2 percent greater than the optimum water content as determined by the modified Proctor compaction test(ASTM D1557). Is WMU FU-13 REPORT.DOC 5-2