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The summaries of destructive test results for fusion seams for the Phase 5 Berm <br />Modification primary geomembrane are presented in Appendix J.S. Record Drawing No. 3 of <br />3 presented in Appendix A shows the destructive test sample locations. <br />6.6 Non - Destructive Testing <br />Lone Star performed non - destructive seam testing on completed seams and geomembrane <br />repairs. Non - destructive testing for seams included pressure testing of fusion - welded <br />seams, and vacuum testing of extrusion - welded seams and repairs. AMEC monitored and <br />documented the non - destructive testing. <br />Prior to pressure testing of fusion seams, Lone Star heat - sealed both ends of the air <br />channel between the two tracks of the double wedge weld. Lone Star then inserted a <br />pressure gauge in one end of the sealed channel. Lone Star pressurized the air channel to <br />approximately 30 pounds per square inch (psi) using an air pump. After pressure <br />stabilization, AMEC monitored the gauge for a minimum of five minutes. The maximum <br />allowable pressure drop was 3 psi. <br />Lone Star and AMEC verified fusion seam continuity before heat - sealing both seam ends, <br />completed pressure testing, and with the gauge left in place, cut the opposite end of the <br />seam. If the gauge pressure dropped to zero, the seam was determined to be continuous. <br />In cases where the seam was found to be discontinuous, the seam was subdivided into <br />shorter sections until continuous seam sections were located and passing pressure tests <br />were performed, or the outer edge of the seam was extrusion welded and vacuum tested. <br />If a pressure test failed, Lone Star checked the seam section for leakage, and repaired and <br />re- tested the seam. If Lone Star was unable to find the leak, the seam was divided into two <br />sections, with each section being tested to locate the area of concern. This subdivision <br />process was repeated until the leak location was identified. If the leak area was not located, <br />Lone Star reconstructed the seam, and then vacuum tested the repair. <br />AMEC Environment & Infrastructure, 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 <br />25 <br />