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INTERFACE LINER SLOPE REINFORCEMENT DESIGN FOR SLOPES STEEPER THAN 6•1 WMU FU-04,FORWARD,INC.LANDFILL PROBLEM: Estimate the thickness of subgrade fill required to support the WMU FU-04 interface liner on the south facing former Austin Road Landfill slope and the south facing WMU ART-03 slope. GIVEN: These calculations were previously performed for the WMU D-94,D-97,D-98,D-99,and FU-03 designs. Since the interface slope liner and LCRS components are approximately the same as for the previous designs,the methodology used in the previous calculations is applicable to the WMU FU-04 design. The methodology presented in Jang and Montero(1993)estimates the required subgrade fill thickness to bridge a 3 ft by 3 ft by 6 ft void under the liner system. The dimensions of the void were estimated by assuming a worst case scenario of an item as large as a refrigerator collapsing directly under the lining system. SUMMARY: 1. For the 5:1 Austin Road Landfill slope,the subgrade fill thickness should be approximately 4-ft. 2. For the 3:1 WMU ART-03 slope,the subgrade fill thickness should be approximately 4-ft.