2014-02-07_REPORT - M1980244 ‎(7)‎

• Permit No: M1980244
• IBM Index Class Name: Report
• Doc Date: 2/7/2014
• Doc Name: Final Report QA Monitoring and testing volume 1 of 2 doc 1of3 Mill Site Earth works
• From: CC&V
• To: DRMS
• Email Name: TC1
• Media Type: d
• Archive: No

Cripple Creek & Victor Gold Mining Company
Mill Site Earthworks Project
Final Report ameO
Quality Assurance Monitoring &Test Results
January 31, 2014
comparison to nuclear density values. The moisture density testing frequency of
approximately one test per 451 cubic yards exceeded the minimum specified testing
frequency of one test per 500 cubic yards. Nuclear density tests are summarized in
Table 12. Any failing areas were re- worked, re- compacted, and re- tested to meet
Project Specifications. The number of re -tests was not used to determine the testing
frequency. Holes made in the SLF during testing were filled by tamping fine bentonite
material into the holes, as specified.
Depth Verification
Ames drilled a total of 75 "potholes" in the compacted SLF to verify a minimum 12 inch
compacted depth had been achieved. AMEC monitored the drilling of the holes,
verified the depth, and documented the results. All pot holes were greater than 12
inches. Depth verification holes were filled with fine bentonite material, as specified.
The testing frequency of 2.2 holes per acre exceeded the minimum specified testing
frequency of two holes per acre. The SLF depth verification results met Project
Specifications and are presented in Table 13.
4.2.5 Drain Cover Fill
AMEC provided visual observation of DCF placement. One AMEC monitor and a
minimum of two Ames labourers monitored each dozer, unless two dozers were within
approximately 50 feet of each other during placement. AMEC verified that wrinkles in
the geomembrane did not fold over; PVC grade markers were placed on a maximum
50 foot wide by 50 foot long grid and at grade breaks; and that fill materials were
suitable. AMEC continuously inspected geomembrane during DCF placement;
marked damaged areas for repair if required; and verified all repairs were completed to
Project Specifications prior to material placement. After final grading, AMEC
monitored removal of PVC grade markers. The DCF sieve analysis, moisture content,
and Atterberg Limits testing frequency of approximately one test per 4,332 cubic yards
of placed material exceeded the minimum specified testing frequency of one test per
20,000 cubic yards.
4.2.6 Temperature Monitoring
AMEC recorded ambient air temperatures using a Davis Vantage Pro 2 data - logging
weather system. Temperatures were measured every hour during normal working
hours. The lowest and highest daily temperatures are summarized in Table 2.
During placement of fill materials, when the ambient air temperature was less than
32 °F for longer than 1 hour within a 24 hour period, AMEC observed and recorded the
temperature of the fill material at depths of 3 and 6 inches, at a frequency of 6 tests
per acre. The average temperature was calculated and recorded and used to ensure
that no frozen materials were placed during the construction of the Project. Fill
temperature data is summarized in Table 3.
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