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2019-09-30_REVISION - M1980244 (5)
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2019-09-30_REVISION - M1980244 (5)
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Last modified
1/6/2025 4:56:59 AM
Creation date
10/8/2019 1:02:33 PM
Metadata
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Template:
DRMS Permit Index
Permit No
M1980244
IBM Index Class Name
Revision
Doc Date
9/30/2019
Doc Name
Request for Technical Revision
From
CC&V
To
DRMS
Type & Sequence
TR118
Email Name
TC1
Media Type
D
Archive
No
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Cripple Creek&Victor Gold Mining Company <br /> Squaw Gulch VLF Phase 2A Part 2 ■ <br /> Record of Construction Report <br /> 475.0106.032 <br /> September 30,2019 <br /> including welding angle, grinding, and weld/welding rod cleanliness. The CQA Monitor <br /> logged the welding machine and welding technician combination,the length of the seam, <br /> the direction the seam was welded, time of seaming, the pre-heat temperature, and the <br /> welding temperature. Destructive test samples were marked during extrusion seaming <br /> and testing is discussed further in Section 3.4.5.All extrusion welded seams were vacuum <br /> tested and is discussed further in Section 3.4.7. The Geomembrane Extrusion Welding <br /> Summary is presented in Appendix J.4. <br /> 3.4.5. Geomembrane Destructive Testing <br /> During welding activities destructive test samples were marked for every 500 linear feet <br /> of seam for each welding type and each welding machine/welding technician <br /> combination. A 24-inch long by 12-inch wide sample was cut from the seam centered on <br /> the seam lengthwise. The sample was then cut in two halves. One half was archived by <br /> the CQA Monitor to be tested later, if necessary. Ten 1-inch coupons were then cut from <br /> the remaining sample half. Five coupons were tested for shear strength and five coupons <br /> were tested for peel strength using a tensiometer. The different failure types and test <br /> codes for fusion and extrusion destructive testing are presented on Figures 3 and 4, <br /> respectively. All destructive testing was performed by Tetra Tech in the presence of the <br /> CQA Monitor. Five fusion and two extrusion destructive tests failed within the Squaw <br /> Gulch Phase 2A Part 2 area and the extent of the failure was delineated by obtaining <br /> samples before and after the failed sample. Once the failing area was identified, that <br /> portion of the seam was capped. Fusion and Extrusion Destructive Testing Summaries are <br /> presented in Appendix J.5.1 and Appendix J.5.2, respectively, and the tensiometer <br /> certifications are presented in Appendix L. <br /> 3.4.6. Geomembrane Pressure Testing <br /> Pressure testing was performed to ensure all fusion welded seams had continuity <br /> throughout their entire length. The ends of the seam were sealed and the air channel in <br /> the seam was pressurized using a small air compressor to a minimum of 30 pounds per <br /> square inch (psi),for a minimum of five minutes.A pressure gauge and needle were used <br /> to monitor the air pressure in the seam. If the pressure dropped less than 3 psi, the <br /> opposite end of the seam from the pressure gauge was cut. If the needle dropped, <br /> continuity was confirmed throughout entire seam length and the test was considered <br /> "passing." If a pressure drop of more than 3 psi occurred or the continuity was not proven, <br /> smaller sections of the seam were tested to delineate the failing section of the seam. All <br /> failing seams or portions of seams were repaired, and vacuum tested.The Geomembrane <br /> Seam Pressure Testing Summary is presented in Appendix J.6. <br /> P.\Projects\Cert Report-Phase 2A Part 2\475.0106.032 CCV PHASE 2A Part 2 ROC REPORT.docx <br /> Page 13 <br />
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