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BASE AND SLOPE LEACHATE COLLECTION AND REMOVAL SYSTEM DESIGN <br />WMU FU-23 <br />FORWARD LANDFILL <br /> <br /> <br />PROBLEM: <br />Size the leachate collection and removal system components for the base of WMU FU-23. <br /> <br />GIVEN: <br />These calculations were previously performed for the WMUs D-95, D-97, D-98, D-99, D-00, D-01, D-02, <br />FU-03, FU-04, FU-05, FU-06, FU-08, FU-10, FU-13, FU-14, FU-17, and FU-19 design. The same <br />methodology for performing the previous calculations was used for the WMU FU-23 calculations. <br />Previous calculations are used, referenced, or attached, where applicable. <br /> <br />SUMMARY: <br /> <br />1. Required permeability of granular drainage material is 0.1 cm/sec. <br /> <br />2. Required permeability of coarse gravel is 1 cm/sec. <br /> <br />3. Specify 6-inch diameter, SDR 11 HDPE pipe. <br /> <br />4. Specify perforation pattern for pipes of 1/4-inch diameter holes drilled at fourth points every 6-inches <br />along pipe length. <br /> <br />5. The temporary sumps are sized assuming the maximum leachate generation time is when there is only <br />a 10-ft lift of refuse in the cell. <br /> <br />6. Site personnel will select the pump size. <br /> <br />