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January 9, 1996 -3- 943-2847.001 <br /> Interface Shear Strength Testing <br /> The following configurations were tested with the laboratory test results presented in <br /> Attachment A: <br /> 1. Cresson Ore Drain Cover Fill / 80 mil smooth. LLDPE / Ironclad: Soil Liner Fill. Test <br /> results yielded a cohesion of 1235 psf and friction angle of 26 degrees, for both the <br /> peak and residual values. The failure plane was noted to occur between the Soil Liner <br /> Fill and the 80 mil smooth LLDPE geomembrane; <br /> 2. Cresson Ore Drain Cover Fill / 80 mil smooth LLDPE with 60 percent Carlton <br /> tailings/Ironclad Soil Liner Fill,. Interface testing performed indicated peak and <br /> residual values for the cohesion and friction angle to be 435 psf and 30 degrees, <br /> respectively. The failure surface occurred between the Soil Liner Fill and the 80 mil <br /> smooth LLDPE geomembrane; <br /> 3. Cresson Ore Drain Cover Fill / 80 mil smooth HDPE / Ironclad Soil Liner Fill. The <br /> material had a peak cohesion of 845 psf and. a friction angle of 24 degrees, and a <br /> residual cohesion of 895 psf and a friction angle of 23 degrees. The failure surface <br /> was noted to occur between the Soil Liner Fill and the 80 mil smooth HDPE <br /> `. geomembrane; <br /> 4. Cresson Ore Drain Cover Fill / 80 mil smooth HDPE with 60 percent Carlton tailings / <br /> Ironclad Soil Liner. A peak friction angle of 26 degrees and cohesion of 245 psf was <br /> measured. in addition to a residual friction an.gle of 25 degrees and cohesion of 340 <br /> psf. The failure plane was observed to occur between the Soil '-iner Fill and the 80 <br /> mil smooth HDPE geomembrane; <br /> 5. Cresson Ore Drain Cover Fill / 100 mil smooth HDPE / :Pad No. 3 Low Volume <br /> Solution Collection Fill. The material had a pea:< cohesion of 290 psf and a friction <br /> angle of 30 degrees, and a residual cohesion of 275 psf and a friction angle of 29 <br /> degrees. The failure surface was noted to occur between the Low Volume Solution <br /> Collection Fill and the 100 mil smooth HDPE geomembrane; <br /> 6. Pad No. 3 Low Volume Solution Collection Fill / 100 mil smooth HDPE / Area No. 2 <br /> Soil Liner Fill. The material had a peak and .residual cohesion of 500 psf and a friction <br /> angle of 7 degrees. The failure surface was noted to occur between the Soil Liner Fill <br /> and the 100 mil smooth HDPE geomembrane; <br /> 7. Due to the results obtained from configuration 6, the configuration was modified to Pad <br /> } No. 3 Low Volume Solution Collection Fill / 100 mil textured I3DPE / Area No. 2 <br /> Soil Liner Fill (Sample No. TP-20.). The material had a peak and. residual cohesion of <br /> 2195 psf and a friction angle of 14 degrees. In addition, interface shear strength test <br /> was repeated for the same configuration with the exception that Sample TP-1 was used <br /> for the Soil Liner Fill. The test results for the second configuration indicated the <br /> Golder Associates <br />