COMPLIANCE INFO_FINAL WMU FU-23 DESIGN RPT & CONCURRENCE LTRS

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Forward Landfill WMU FU-23 02778 8 HDPE GEOMEMBRANE e. The asperity of the textured HDPE geomembrane used in testing shall be recorded. The data shall be submitted with the test results. The HDPE geomembrane used for shear strength testing shall be from one of the rolls that will be shipped to the site for construction of the lining system. f. The testing laboratory shall submit 4"x4" tested geomembrane and cushion geotextile sample with the test results to the QA/QC CONSULTANT. The lot and roll number of the geomembrane should also be reported. 9. The QA/QC CONSULTANT shall test the interface shear strength of the Double-Sided Textured HDPE Geomembrane and the clay liner in accordance with the CQA Manual requirements and as described below. The textured side of the HDPE Geomembrane shall be tested against the clay liner and shall exhibit an interface shear strength equal to that of the clay liner alone and having a minimum post-peak (@ 3-inch or more deformation) interfacial shear strength that meets the following requirements: Normal Stress (psf) Minimum Shear Stress (psf) 2,000 650 4,000 1,300 6,500 2,100 8,000 2,400 12,000 3,100 a. Post-peak conditions are defined as the point at which the applied shear stress remains constant with increasing displacement up to 3-inch or more. Perform the interface shear strength tests between the textured HDPE Geomembrane and the clay liner in accordance with the following: 1) The clay liner soil will be placed in the upper shear box and compacted to a minimum 90 percent relative compaction at a moisture content between 3 to 8 percent above optimum in accordance with ASTM D1557. 2) Spray textured side of site-specific HDPE geomembrane with water. Anchor HDPE on top of lower box and place textured side of geomembrane against compacted clay liner. 3) The gap between two boxes shall be large enough such that the clay and HDPE are open so that failure occurs along the weakest surface. 4) Saturate with water under test normal stress for 24 hours. Use test normal stresses of 2,000; 4,000; 6,500; 8,000; and 12,000. 5) Shear at 0.04 in./min per ASTM D 5321 to post-peak conditions of 3 inches or more. 6) The asperity of the textured HDPE geomembrane used in testing shall be recorded. The data shall be submitted with the test results. The HDPE geomembrane used for shear strength testing shall be the same one that will be shipped to the site for construction of the lining system.