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C <br />TABLE 3 <br />SUMMARY OF INTERFACE aSTRENGTH <br />GCL - Geosynthetic Clay Liner <br />GM - 60 -mil Double -Sided Textured (DST) HDPE Geomembrane <br />GC - Geocomposite <br />615 Does not meet specifed post -peak strength <br />Notes: <br />1. GCL internal failure <br />2. Test rerun with GCL sample with high peel strength (58 lbs). The remaining tests in this test series used GCL <br />roll with a peel strength of 47.5 lbs. <br />3. Test rerun using GCL with low peel strength of 47.5 lbs. Sliding initially occurred on GCL/GM interface and resulted <br />in GCL internal failure. Remaining tests in this test series used GCL with a peel strength of 53.6 lbs for 8,000 and 12,000 psf <br />normal stress points and peel strength of 48.6 lbs for 1,000, 4,000 and 6,000 psf normal stress points. <br />Measured Interface Strength (psf) <br />Series 1 <br />Series 2 Series 3 <br />Series 4 <br />Series 5 <br />Single Interface <br />Single Interface Single Interface <br />Base Liner <br />Side Slope Liner <br />Required <br />GCL Foundation Soil <br />GCL GM GM GC <br />Sandwich Test <br />Sandwich Test <br />post -peak <br />Normal <br />Strength <br />Stress psf <br />psf <br />Peak Post -Peak <br />Peak Post -Peak Peak Post -Peak <br />Peak Post -Peak <br />Peak Post -Peak <br />1,000 <br />404 <br />757 649 <br />720 445 599 "! 72, c = <br />672 535 <br />625 <br />4,000 <br />1174 <br />2765 2354 <br />2395 1625 2235#! <br />2386 1527 <br />2127 1f <br />6,000 <br />1370 <br />3582 °''615 - <br />3489 1977 3013 1477 <br />3448 1811 <br />2968 1465 <br />8,000 <br />1515 <br />1 4596 ''791' <br />4506 2355 3794 1735 <br />4293 2195 <br />3742 1696 <br />12,000 <br />1555 <br />5725`= <br />