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 Project
Quality Assurance Monitoring and Test Results
Phase 46 /C Triangle Liner Certification
August 10, 2010
4.1.5 Permeability Tests
AMEC completed permeability testing of SLF material. The testing frequency (approximately
one test per 300 cubic yards) exceeded the minimum specified testing frequency of one test per
5,000 cubic yards. Testing was performed with a flexible -wall permeameter with back - pressure
saturation and a constant rate of flow (ASTM D5084, Method D). The SLF was remolded to
95% of the maximum dry density (ASTM D698) and the optimum moisture content. Laboratory
testing yielded a coefficient of permeability for the CQA samples met the project specifications.
The permeability test results for the SLF are presented in Appendix F.
4.2 Field Testing and Monitoring
AMEC observed all fill operations in the construction to verify, when necessary; lift thickness,
adequate compaction, and acceptable moisture conditions. When AMEC performed nuclear
density testing, holes made in the fill during testing were filled by tamping fine SLF material into
the holes. AMEC standardized nuclear gauges at the start of each day's work according to
ASTM D2922.
4.2.1 Subgrade Preparation
AMEC monitored subgrade preparation, including verification that Ames compacted the
subgrade with a smooth drum vibratory compactor. AMEC verified that Ames removed
protruding rocks from the subgrade surface prior to SLF placement. AMEC verified that the
subgrade surface was moisture conditioned, smooth, and unyielding prior to SLF placement.
4.2.2 Site Grading
Structural fill placement was not required as part of the certification area. However, existing
material was shaped or compacted for the acceptance of SLF placement.
4.2.3 Soil Liner Fill
Field testing included monitoring of placement and preparation of SLF for geomembrane
deployment, testing in -place moisture and density with a nuclear gauge, and monitoring depth
verification.
4.2.3.1 Field Monitoring
AMEC observed SLF placement to verify lift thickness, adequate compaction, acceptable
moisture conditions, final compacted thickness, and suitability for geomembrane deployment.
AMEC identified angular particles on the fill surface, ruts, and desiccation cracks, and brought
these features to the attention of Ames for repair. When necessary, AMEC verified these
repairs were completed. Where necessary, Ames laborers placed fines from their SLF
processing plant or from temporary piles of fine SLF to smooth and re- compact the fill surface in
5 \PROJECTS \1125E CCV CQA \H2 - DESIGN \TRIANGLE \FINAL \TRIANGLE CERTIFICATION REPORT FINAL REV1 DOC 11