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October 2004 -31- 043 -2170 <br />6.1.3 Seaming <br />ID <br />The double wedge fusion weld was the principal seaming method employed by Poly -Flex for this <br />project. Poly -Flex fusion seamed (welded) geomembrane on the same day that it was deployed. <br />Poly -Flex used extrusion welds for seaming where the Phase IVc 80 -mil LLDPE was tied into <br />existing Phases IVb geomembrane, for repairs, and where conditions were unfavorable for fusion <br />welding (e.g., sharp corners). Golder observed trial seam tests, monitored seaming equipment <br />temperatures and speed, and provided visual observation of the seaming procedures. Golder observed <br />the entire lengths of all seams, patches, and other repairs either during seaming, or shortly after <br />completion. <br />61.3.1 Trial Seam Monitoring <br />Poly -Flex performed trial seams to monitor the performance of the seaming apparatus and operator <br />under actual site conditions. Each welding operator and his apparatus produced trial seams prior to <br />the beginning of each day's seaming operation and in the event that devices were disconnected from <br />power and re- energized. <br />Poly -Flex cut 1 -inch wide samples (coupons) from each trial seam and tested the coupons with a field <br />tensiometer. Poly -Flex tested each double wedge fusion trial seam twice for peel adhesion (peel) and <br />once for bonded seam strength (shear). Poly -Flex conducted peel tests on fusion welds on both the <br />inner and outer tracks of each peel coupon. Poly -Flex tested each extrusion trial seam twice for peel <br />and once for shear. <br />Golder personnel observed the testing of trial seam samples and documented test results. Golder <br />observed the tensile testing of each trial seam coupon to verify that project yield strengths were met <br />during shear testing and that failure did not occur in the weld during peel testing. When trial seams <br />did not meet specifications, Golder verified that the welding apparatus was not used until two <br />consecutive trial seams performed by the same technician/apparatus combination met specifications. <br />The trial seam test results for extrusion and fusion seaming are presented in Appendix K -3. Poly -Flex <br />used one tensiometer during the project. Tensiometer certifications are presented in Appendix K -4. <br />Figures 3 and 4 show the codes used to dcsignate passing and failing test results_ <br />0 <br />ewUX70%W0*kCe".aetirvc-MOM uznaaMIUS&CerftNFa« Golder Associates <br />