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Letter to John Rozelle <br />Page 2 of 2 <br />1/14/2003 <br />PROCEDURE <br />The stability analyses were performed usitig the simplified Bishop's Method (SLOPE/W <br />software). The minimum safety factor and extent of failure for the designed slope were analyzed. <br />Additionally, a safety factor sensitivity matrix was computed to illustrate the effects of alternate <br />estimates of angles of internal friction and cohesion. <br />CONCLUSION <br />Based on these analyses and the information available, the Suttle Ditch will not be compromised <br />by slope failure when constructed according to the configurations and material properties showri <br />in Figure A3. The overall minimum safety factor for the slope is estimated at 1.4. <br />Should you have questions regarding this report or wish further discussion, please call. Greystone <br />appreciates E(~jptapgp~nity to be of service to Lafarge West, Inc. <br />K. M. <br />Enc: 5 copies Figure A-3 <br />Suttle Ditch Slope Stability <br />Minimum Safety Factor <br />