REP01903

• Permit No: M1999098
• IBM Index Class Name: Report
• Doc Name: SLOPE STABILITY REPORT FOR RIVERVIEW RESOURCE
• Media Type: D
• Archive: No

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10. The safety factors are based on an assumed value for the strength of the bedrock
' on the site. The strength of the bedrock has no impact on the stability of the
mining highwalls. A failure surface will not initiate or propagate through the-~
bedrock material A conservative c value of 300 psf and a friction angle of 45
' degrees was selected [o represent the strength of the bedrock
The stability analysis and resulting factors of safety are based on assumed values for soil
' properties for this site. The values selected are representative of soils in this area and are
considered to be conservative.
The following recommendations for monitoring of slope stability should be followed:
1. A visual inspection of the excavated highwalls should be done on a weekly basis
for the first 6 months of mining. This inspection should consist of walking the
' existing ground and looking for any signs of stress cracks or other potential signs
of slope failure. Some minor Bluffing of highwalls is expected on any mine site.
The intent of this inspection is to locate potential major slope failures that could
' potentially extend back into a structure.
2. A visual inspection should be done anytime afler a major precipitation event that
' has saturated the ground using the same procedures. A major precipitation event
would be defined as a storm that produces an intensity level reached once in 50
' years on the average.
3. If a visual inspection detects signs of a potential slope failure, qualified personnel
' should be contacted to evaluate a recommend remediation work to stabilize the
area.
' 4. If no visible signs of slope failure are detected within the first 6 months, then the
inspection period could be reduced to once per month or after every major
precipitation event.
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