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BASE AND SLOPE LEACHATE COLLECTION AND REMOVAL SYSTEM DESIGN <br />WMU FU -06 SOUTHERN PORTION <br />FORWARD LANDFILL <br />PROBLEM: <br />Size the leachate collection and removal system components for the base and slope in the southern portion <br />of WMU FU -06. <br />GIVEN: <br />These calculations were previously performed for the V;Ws D-95, D-97, D-98, D-99, D-00, D-0 1, D-02, <br />FU -03, FU -04, and FU -05 design. The same methodology for performing the previous calculations was <br />used for the WMU FU -06 calculations. Previous calculations are referenced and attached, where <br />applicable. <br />SUMMARY: <br />1. Required permeability of granular drainage material is 0.1 cm/sec. <br />2. Required permeability of coarse gravel is 1 cm/sec. <br />3. Specify 6 -inch diameter, SDR 11 HDPE pipe. <br />4. Specify perforation pattern for pipes of 1/2 -inch diameter holes drilled at third points every 6 -inches <br />along pipe length. <br />5. The permanent sumps are sized assuming 10 -ft of refuse in WMU FU -06. <br />6. Site personnel will select the pump size. <br />7. A 200 -mil GDN with a hydraulic transmissivity of 1 x 10"5 M2 /sec measured using water at 68°F f3°F <br />(20°C t1.5°C) with a hydraulic gradient of 0.5 under a compressive stress of 10,000 psf. The <br />geocomposite shall be tested with onsite soil above the Geocomposite and Geomembrane below the <br />Geocomposite. The minimum test duration shall be 100 hours and the report for the test results shall <br />include measurements at intervals over the entire test duration. <br />11 <br />