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
Quality Assurance Monitoring & Test Results
January 31, 2014
ameO
AMEC performed 25 CQA Atterberg limits tests of DCF. The testing frequency
(approximately one test per 4,332 cubic yards) exceeded the minimum specified
testing frequency of one test per 20,000 cubic yards. The DCF CQA Atterberg limits
met Project Specifications; the results are presented in Appendix H.1 and summarized
in Table 11.
4.1.4 Proctor Compaction Tests
AMEC performed Standard Proctor compaction tests of SLF in order to compare in-
place densities and moisture contents with laboratory derived values of maximum dry
density and optimum moisture content. Thirty -two CQA Standard Proctor compaction
tests of SLF were conducted. The testing frequency (approximately one test per 1,692
cubic yards) exceeded the minimum specified testing frequency of one test per 4,000
cubic yards. The SLF compaction test results met Project Specifications; the results
are presented in Appendix H.2 and summarized in Table 10.
AMEC performed Standard Proctor compaction tests of SSF in order to compare in
place densities and moisture contents with laboratory derived values of maximum dry
density and optimum moisture content. AMEC performed four CQA standard Proctor
compaction tests of SSF. The testing frequency (approximately one test per 1,265
cubic yards) exceeded the minimum specified testing frequency of one test per 50,000
cubic yards. The SSF compaction test results met Project Specifications; the results
are presented in Appendix H.2 and summarized in Table 7.
4.1.5 Permeability Tests
AMEC conducted 18 permeability tests of re- compacted samples of SLF. The testing
frequency (approximately one test per 3,008 cubic yards) exceeded the minimum
specified testing frequency of one test per 4,000 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 fill was re- compacted to 95 percent of the
Standard Proctor (ASTM D698 -12) maximum dry density at the optimum moisture
content (as determined from oven dried samples). Laboratory tests yielded
coefficients of permeability for the CQA samples from 6.2 x 10 -7 cm /sec to 2.3 x 10-8
cm /sec, all of which are less than the specified maximum permeability of 1 x 10 -6
cm /sec. The permeability test results for the SLF met Project Specifications; the
results are presented in Appendix H.3 and summarized in Table 10.
4.2 Field Testing and Monitoring
AMEC observed earthworks fill operations to verify lift thickness, adequate
compaction, and acceptable moisture conditions. Holes made in the fill during testing
were backfilled and tamped with fine bentonite materials. AMEC standardized the
nuclear gauges at the start of each day according to ASTM D2922.
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