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3. The stability analysis assumes the base liner interface shear strengths between the clay and textured <br /> HDPE are a friction angle of 18 degrees and an apparent cohesion of 0 psf and a friction angle of 10 <br /> degrees and an apparent cohesion of 1,000 psf for normal load ranges from 0 to 6,500 psf and from <br /> 6,500 to 17,000 psf,respectively. The base liner interface strength between the cushion geotextile and <br /> the textured HDPE geomembrane is a friction angle of 15.5 degrees and zero cohesion and a friction <br /> angle of 9.5 degrees and an apparent cohesion of 1,000 psf for normal load ranges from 0 to 8,000 psf <br /> and from 8,000 to 16,000 psf,respectively. The slope liner interface shear strengths are assumed to be <br /> a friction angle of 7 degrees and no cohesion. The interface shear strength envelopes for the critical <br /> surfaces are included with the calculations. <br /> 4. The maximum refuse fill height and slope for WMU FU-10 should be reevaluated based on actual <br /> direct shear test results on the base and slope liner interfaces. <br />