2010-08-10_REPORT - m1980244

• Permit No: m1980244
• IBM Index Class Name: REPORT
• Doc Date: 8/10/2010
• Doc Name: QA REPORT Phase 4B/C Triangle Liner Certification Aug 10, 2010
• From: CC&V
• To: DRMS
• Media Type: D
• Archive: No

Cripple Creek & Victor Gold Mining Company
Cresson Protect
Quality Assurance Monitoring and Test Results
Phase 4B /C Triangle Liner Certification
August 10, 2010
Lonestar constructed approximately 572 linear feet of fusion welded seams and 216 linear feet
of extrusion welded seams. The specified frequency of destructive testing was one test per
500 lineal feet of weld. AMEC identified and Lonestar obtained destructive samples from the
geomembrane panel seams at a frequency of one destructive test sample per 286 linear feet of
fusion welded seams. The test frequencies exceeded project requirements.
Lonestar tested the inside and outside tracks of the fusion welds for peel. Lonestar performed
all destructive tests on -site using a field tensiometer, and AMEC observed and documented all
tests.
The specified acceptance criteria for 100 -mil single sided texture LLDPE shear tests was that
four of the five coupons tested must have an ultimate strength of at least 130 pounds per pulling
inch (ppi) prior to yield. The specified acceptance criteria for peel tests was that four of the five
coupons tested must have ultimate strength of at least 100 ppi and achieve a Film Tear Bond
(FTB) upon breaking. All destructive fusion seam and extrusion seam samples met
specifications.
The summaries of destructive test results for fusion and extrusion seams for the geomembrane
are presented in Appendix H -6. Figure 5 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.
S \PROJECTS \1125E CCV CQA \H2 - DES IGN \TRIANGLE \FINAL \TRIANGLE CERTIFICATION REPORT FINAL REV1 DOC 19