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iResults of peel and shear tests must be recorded on a trial weld form. Trial welds must be <br /> completed under conditions similar to those under which production seams will be welded. Trial <br /> welds must meet specified requirements for peel and shear and the failure must be ductile or a <br /> film tearing bond (FTB) for a wedge weld. An FTB means the test specimen breaks at the edge <br /> of the outside of the seam, but not in the seam. <br /> If at any time the CQA monitor believes that a welding apparatus is not functioning properly, a <br /> trail weld must be performed. If there are wide changes in temperature (130°F.), humidity, or <br /> wind speed, another trail weld must be performed. The trail weld must be allowed to cool to <br /> ambient temperature before it is tested. <br /> 5.2.8 Production Welds <br /> During geomembrane welding operations,the CQA monitor must: <br /> e Verify the installer has the number of welding apparatuses and spare parts necessary to <br /> continuously perform the work. <br /> e Verify equipment used for welding will not damage the geomembrane. <br /> e Verify extrusion welders are purged before beginning a weld so that all heat-degraded <br /> extrudate is removed from the nozzle of the welder. <br /> a Verify seam grinding is completed less than one (1)hour before seam welding, and the <br /> upper sheet is beveled(extrusion welding only). <br /> e Verify ambient temperature is measured six (6)inches above the geomembrane surface is <br /> between 40 Degrees Fahrenheit(°F) and 104°F. <br /> e Verify ends of extrusion welds that are more than 5 minutes old, are ground to expose new <br /> material before restarting a weld. <br /> e Verify contact surfaces of the panels are clean and free of dust, grease, dirt, debris, and <br /> moisture before welding. <br /> e Verify welds are free of dust,rocks,and other debris. <br /> a Verify cross seams are ground to a smooth incline before welding(fusion welding only). <br /> e Verify all seams are overlapped a minimum of 3 inches or in accordance with <br /> manufacturer's recommendations,whichever is more stringent. <br /> e Verify solvents or adhesives are not present in the seam area. <br /> e Verify procedures used to temporarily hold the panels together do not damage the panels <br /> and do not preclude CQA testing. <br /> a Verify panels are being welded in accordance with the plans and technical specifications. <br /> CH CQA Plan 041712 Rev2a.doc 5-7 Constriction QuaW ksurance Plan <br />