2009-07-15_REVISION - M1980244 ‎(23)‎

• Permit No: M1980244
• IBM Index Class Name: REVISION
• Doc Date: 7/15/2009
• Doc Name: QA Mon. & Test Results Load Out- Bin Location
• From: CC&V
• To: DRMS
• Type & Sequence: AM9
• Media Type: D
• Archive: No

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Cripple Creek & Victor Gold Mining Company
Cresson Project
Quality Assurance Monitoring and Test Results
Load Out Bin Relocation
July 7, 2009
ameO
The summaries of destructive test results for fusion and extrusion seams for the geomembrane
are presented in Appendix J-7. Figure 6 shows the destructive test sample locations.
6.1.6 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 seam sections with a vacuum box. Prior to vacuum box
testing, Lonestar applied a soap and water solution to the seam 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
seam for a minimum of ten seconds. Each consecutively tested seam 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
also followed 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 J-6.
SAPROJECTS\1125E CCV CQA\H3 - CONSTRUCTION\LOB CERT REPORT\REPORT BODY\LOB CERT REPORT 2009.07.07.DOC
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