2012-02-28_REVISION - M1980244 ‎(89)‎

• Permit No: M1980244
• IBM Index Class Name: REVISION
• Doc Date: 2/28/2012
• Doc Name: VOL. 4, Appendix 7: Squaw Gulch Overburden Storage Area Including Mill Patform Stability Evaluation
• From: CRIPPLE CREEK & VICTOR GOLD MINING COMPANY
• To: DRMS
• Type & Sequence: AM10
• Email Name: TC1
• Media Type: D
• Archive: No

2.3 Soil Material
The soil material used in the testing program is presented in Appendix A. The soil
material was obtained from the project site by Golder and delivered directly to
GeoSyntec for testing.
2.4 Test Configuration and Procedures
' GeoSyntec Consultants
The configuration of the test specimens and tie specific test procedures used to
conduct each of the direct shear tests are presented in Appendix B. GeoSyntec
understands that the test procedures and test conditions were selected by Mr. Mandziak
of Golder to model anticipated field conditions.
3. TEST RESULTS
For each of the direct shear tests, the total- stress shearing resistance was evaluated
for each applied normal stress. The test data were plotted on a graph of shear force
versus horizontal displacement. The resulting plots are presented in Appendix C. The
peak value of shear force was used to calculate the peak shear strength. For this report,
the large displacement shear strength (r was calculated using the shear force
measured at the end of each test. No area correction was used when computing normal
and shear stresses because each test was performed using a constant effective sample
area (i.e., the area of the lower shear box was larger than that of the upper shear box).
The calculated shear strengths were plotted on a graph of shear stress versus normal
stress and the results were used to evaluate total - stress peak and large displacement
shear strength envelopes. A best -fit straight line was drawn through the data points from
the test series to obtain total - stress peak and large displacement shear strength friction
angles and cohesions. The coefficient of correlation (R a standard statistical indicator
of how well the best -fit line matches the test data, was obtained for each best -fit line.
The summary plots of shear stress versus normal stress for the test series are also
presented in Appendix C. The friction angles, cohesions, and R values derived from the
plotted test results are presented in Table 1.
GL10603/SG198073 2 98.07.31