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ameO <br />• <br />discussion of repairs. AMEC also observed the overlap of each panel with adjacent panels <br />to verify that sufficient overlap for seaming existed. AMEC logged insufficient panel <br />overlaps as defects and marked them for correction. <br />Ames surveyed all panel intersections and destructive seam sample locations. Using these <br />points, AMEC has provided the primary geomembrane panel layout record drawing (Record <br />Drawing No. 5), in Appendix A. <br />The 2010 Phase 5 OSA LLDPE primary geomembrane deployment observations are <br />presented in Appendix J-1. <br />6.1.3 Seaming <br />The double wedge fusion weld was the principal seaming method employed by Lone Star <br />for this project. Lone Star fusion seamed (welded) geomembrane on the same day that it <br />was deployed. Lone Star used extrusion welds for seaming where the 2010 Phase 5 OSA <br />80-mil LLDPE primary geomembrane was tied into the Phase 5 PSSA LLDPE primary <br />geomembrane, for repairs, and where conditions were unfavorable for fusion welding (e.g., <br />sharp corners). AMEC observed trial seam tests, monitored seaming equipment <br />temperatures and speed, and provided visual observation of the seaming procedures. <br />AMEC observed the entire lengths of all seams, patches, and other repairs either during <br />seaming, or shortly after completion. <br />6.1.3.1 Trial Seam Monitoring <br />Lone Star performed trial seams to monitor the performance of the seaming apparatus and <br />operator under actual site conditions. Each welding operator and his apparatus produced <br />trial seams prior to the beginning of each day's seaming operation, after all work activity <br />stoppages, and in the event that devices were disconnected from power and re-energized. <br />Lone Star cut 1-inch wide samples (coupons) from each trial seam and tested the coupons <br />with a field tensiometer. Lone Star tested each double wedge fusion trial seam twice for <br />AMEC Earth & Environmental, Inc. <br />2000 S. Colorado Blvd 2-1000 <br />Denver, CO 80222 <br />Tel 303-935-6505 <br />Fax 303-935-6575 www.amec.com 44