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2.3 Geosvnthetic and Soil Materials <br />The geosynthetic and soil materials used in the testing program are presented in <br />Appendix A. The geomembrane materials were provided to GeoSyntec by CC&V. The <br />three site soils were obtained from the project site by CC &V and delivered directly to <br />GeoSyntec for testing. <br />2.4 Test Confi uration and Procedures for Interface Direct Shear Tests <br />The configuration of the test specimens and the specific test procedures used to <br />conduct each of the interface direct shear tests are presented in Appendix B. GeoSyntec <br />understands that the test procedures and test conditions were selected by Mr. Mandziak <br />of CC &V to model anticipated field conditions. <br />3. TEST RESULTS <br />3.1 Failure Modes <br />For Test Series 1, shear failure (sliding) occurred between the drain cover fill and <br />the geomembrane. For Test Series 2 and 3, sliding occurred between the clay borrow <br />soil liner (SLC -4) and the textured side of the geomembrane. <br />3.2 Data Presentation <br />C 2000 GcoSvntec Consultants <br />For each of the interface direct shear tests, the total- stress shearing resistance was <br />evaluated for each applied normal stress. The test data were plotted on a graph of shear <br />force versus horizontal displacement. The resulting plots are presented in Appendix C. <br />The peak value of shear force was used to calculate the peak shear strength. The large <br />displacement shear strength (TL) was calculated by using the shear force measured at the <br />end of each test. No area correction was used when computing normal and shear <br />stresses because each test was performed using a constant effective sample area (i.e., the <br />area of the lower shear box was larger than that of the upper shear box). <br />The calculated shear strengths are plotted on a graph of shear stress versus normal <br />stress. The results were used to evaluate total- stress peak and large displacement shear <br />strength envelopes. A straight line was drawn from the origin through the data points <br />GLI1126 /SGI00011.DOC 2 00.02.25 <br />