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October 2001 -31- 003-2182.004 <br /> monitored the gauge for a minimum of five minutes. The maximum allowable pressure drop <br /> was 3 psi. <br /> Poly-Flex and Golder verified fusion seam continuity using one of two methods. Prior to heat- <br /> sealing the seam end and performing pressure testing, Poly-Flex pumped air through the <br /> channel with the gauge in place. If the gauge pressure remained zero, the channel was <br /> determined to be continuous. Alternatively, Poly-Flex heat-sealed both seam ends, completed <br /> pressure testing, and with the gauge left in place, cut the opposite end of the seam. If the gauge <br /> pressure dropped to zero, the seam was determined to be continuous. In cases where the seam <br /> was found to be discontinuous, the seam was subdivided into shorter sections until continuous <br /> seam sections were located and passing pressure tests were performed, or the outer edge of the <br /> seam was extrusion welded and vacuum tested. <br /> If a pressure test failed, Poly-Flex checked the seam section for leakage, and repaired and re- <br /> tested the seam. If Poly-Flex 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 process <br /> was repeated until the leak location was identified. If the leak area was not located, Poly-Flex <br /> reconstructed the seam, and then vacuum tested the repair. <br /> Poly-Flex tested extrusion welded seam sections with a vacuum box. Prior to vacuum box <br /> testing, Poly-Flex applied a soap and water solution to the seam section. The vacuum box was <br /> then placed over the seam area and energized with a vacuum pump capable of creating a <br /> vacuum of not less than 5 psi. Poly-Flex and Golder observed the action of the vacuum on the <br /> seam for a minimum of 10 seconds. Each consecutively tested seam length was overlapped a <br /> minimum of 3 inches. If soap bubbles appeared, Golder marked and documented the leak <br /> location. Poly-Flex then repaired the leak and vacuum tested the repair. This procedure was <br /> also followed to test extrusion repairs and extrusion patches. <br /> I\00\2182\EXTERNAL POND RPTTtNAL DOC Golder Associates <br />