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1 <br /> August 23, 2000 <br /> The embankment stockpile was constructed in 1987. DM has not <br /> ' observed evidence of slumping, settling or slope movement for th stockpile <br /> since it was constructed. The highwall area appeared to have been excavated <br /> ' from competent rock, evidence of instability appeared to be limited to r otential for <br /> ' rock fall. <br /> ' October 6, 2000 <br /> 1 <br /> A slope stability analysis at the embankment area would be r quired by <br /> DMG. An acceptable procedure for determining soil strength includes <br /> ' estimation based on limited field and laboratory investigation. Rec mmended <br /> ' minimum factors of safety against movement range between 1.25 nd 2.0 or <br /> greater. The reported recommended range depends on certainty f strength <br /> ' measurements, cost of repair and potential danger to human life or prol erty. <br /> ' October 11 , 2000 <br /> 1 <br /> ' Fracture mapping, analysis of slope stability and potential for ro k roll out <br /> analysis was requested for the highwall area. <br /> Rhino Engineering, Inc. <br /> t Unaweep Quarry <br /> GEG Job No.593 3 <br />