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May 2005 -8- 053-2386 <br />5.0 RESULTS AND CONCLUSIONS <br />Upon completion of the liner load test periods (24 hours minimum), the test samples were <br />disassembled and the liner materials were visually inspected and vacuum tested for damage. <br />5.1 Test #1-Phases III and IV OSA Liner System <br />The 80-mil textured LLDPE geomembrane liner had minor indentations and scratches, but did not <br />show any-signs of failure or puncture. After visual inspection, the liner material was vacuum tested <br />for pinhole leaks resulting from the loading. A vacuum pressure of 70 mm Hg was applied. The liner <br />passed the vacuum tests, indicating the absence of pinholes in the liner. <br />This liner load test demonstrate that minimum thickness 80-mil LLDPE textured geomembrane liner <br />can withstand ore loads to an equivalent height of approximately 1,110 feet (850 psi, assuming an ore <br />density of 110 pcf), without puncture. This liner system is representative of the Ore Storage Area <br />(OSA) liner system which was approved and constructed within Phases III and IV of the Cresson <br />VLF. <br />5.2 Test #2 - Phase IV PSSA Liner System <br />The 100-mil smooth LLDPE geomembrane liner did not show any signs of failure or puncture. After <br />visual inspection, the liner material was vacuum tested for pinhole leaks resulting from the loading. <br />A vacuum pressure of 70 mm Hg was applied. The liner passed the vacuum tests, indicating the <br />absence of pinholes in the liner. <br />This liner load test demonstrate that minimum thickness 100-mil LLDPE smooth geomembrane liner <br />can withstand ore loads to an equivalent height of approximately 820 feet (630 psi, assuming an ore <br />density of 110 pcf), without puncture. This liner system is representative of the Pregnant Solution <br />Storage Area (PSSA) liner system which was approved and constructed within Phase IV of the <br />Cresson VLF. <br /> <br />c+octor.,a? Golder Associates