2012-12-27_REPORT - M1980244 ‎(8)‎

• Permit No: M1980244
• IBM Index Class Name: REPORT
• Doc Date: 12/27/2012
• Doc Name: QA Monitoring and Test Results- LOB Liner Extension- Cover to Append. G.1
• From: CC&V
• To: DRMS
• Email Name: TC1
• Media Type: D
• Archive: No

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6.2.6 Non - Destructive Testing
Lonestar performed non - destructive seam testing on completed seams and geomembrane
repairs. Non - destructive testing for seams included pressure testing of fusion - welded seams,
and vacuum testing of extrusion welded seams and repairs. AMEC monitored and documented
the non - destructive testing.
Prior to pressure testing of fusion seams, Lonestar heat - sealed both ends of the air channel
between the two tracks of the double wedge weld. Lonestar then inserted a pressure gauge in
one end of the sealed channel. Lonestar pressurized the air channel to approximately
30 pounds per square inch (psi) using an air pump. After pressure stabilization, AMEC
monitored the gauge for a minimum of five minutes. The maximum allowable pressure drop
was 3 psi.
Lonestar and AMEC verified fusion seam continuity before heat - sealing both seam ends,
completed pressure testing, and with the gauge left in place, cut the opposite end of the seam.
If the gauge pressure dropped to zero, the seam was determined to be continuous. In cases
where the seam was found to be discontinuous, the seam was subdivided into shorter sections
until continuous seam sections were located and passing pressure tests were performed, or the
outer edge of the seam was extrusion welded and vacuum tested.
If a pressure test failed, Lonestar checked the seam section for leakage, and repaired and
re- tested the seam. If Lonestar was unable to find the leak, the seam was divided into two
sections, with each section being tested to locate the area of concern. This subdivision process
was repeated until the leak location was identified. If the leak area was not located, Lonestar
reconstructed the seam, and then vacuum tested the repair.
Lonestar tested extrusion welded sections with a vacuum box. Prior to vacuum box testing,
Lonestar applied a soap and water solution to the welded section. The vacuum box was then
placed over the seam area and energized with a vacuum pump capable of creating a vacuum of
not less than 5 psi. Lonestar and AMEC observed the action of the vacuum on the weld for a
minimum of ten seconds. Each consecutively tested weld length was overlapped a minimum of
3 inches. If soap bubbles appeared, AMEC marked and documented the leak location.
Lonestar then repaired the leak and vacuum tested the repair. This procedure was used to test
extrusion repairs and extrusion patches.
The seam non - destructive test summaries (fusion pressure tests and extrusion vacuum tests)
for the geomembrane are presented in Appendix G -6.
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