2009-12-21_REVISION - M1980244 (28)

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Cripple Creek & Victor Gold Mining Company Cresson Project Quality. Assurance Monitoring and Test Results Liner Recertification December 17, 2009 L"M AMEC documented defects by assigning a unique defect identification code to each defect, and marking each defect code on the geomembrane. The summaries of defects, repairs, and non - destructive testing of repairs, including the approximate locations of each repair are presented in Appendix 1 -4. 6.1.5 Destructive Testing AMEC selected destructive test locations based on Lonestar's completion of geomembrane welding, various working conditions, and on seaming observations (e.g., suspicion of a defective weld). Lonestar obtained and tested four fusion seam destructive samples during the installation of the geomembrane. Lonestar constructed approximately 1,018 linear feet of fusion welded seams and no extrusion welded seams. The specified frequency of destructive testing was one test per 500 linear feet of fusion welds. AMEC identified and Lonestar obtained destructive samples from the geomembrane panel seams at a frequency of one destructive test sample per 255 linear feet of fusion welded seams. The test frequencies exceeded project requirements. Field destructive testing of seams consisted of testing ten 1 -inch wide coupons, five of which were tested for peel, and five of which were tested for shear. Lonestar tested the inside and outside tracks of the fusion welds for peel. Lonestar performed all destructive tests on -site using a field tensiometer, and AMEC observed and documented all tests. The specified acceptance criteria for 100 -mil single sided texture LLDPE shear tests was that four of the five coupons tested must have an ultimate strength of at least 130 pounds per pulling inch (ppi) prior to yield. The specified acceptance criteria for peel tests was that four of the five coupons tested must have ultimate strength of at least 100 ppi and achieve a Film Tear Bond (FTB) upon breaking. All destructive fusion seam and extrusion seam samples met specifications. The summaries of destructive test results for fusion and extrusion seams for the geomembrane are presented in Appendix 1 -6. Figures 4 and 5 show the destructive test sample locations. 6.1.6 Non - Destructive Testing Lonestar performed non - destructive seam testing on completed seams and geomembrane repairs. Non - destructive testing for seams included pressure testing of fusion - welded seams, and vacuum testing of extrusion welded seams and repairs. AMEC monitored and documented the non - destructive testing. Prior to pressure testing of fusion seams, Lonestar heat - sealed both ends of the air channel between the two tracks of the double wedge weld. Lonestar then inserted a pressure gauge in S: \PROJECTS \1125E CCV CQA \H2 - DESIGMLINER RECERTIFICATION REPORT\REPORT BODY\QA MONTIORING AND TEST RESULTS LINER 20 RECERTIFICATION.DOC - -