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r <br />MEMO to J. Stevens/T. Schreiner <br />April 14, 1997 -T.H.E. Quarry <br />Page 2 <br />are adequate under dynamic conditions, they would be more than adequate for static conditions. The <br />seismic coefficient adopted for the analyses is 0. ] Sg which is consistent with zone 2 o~.'the probable <br />seismic intensity areas. <br />The submitted slope stability results show a range of factors of safety from 2.7 to 7.4 which imply <br />a low probability of potential failure of the proposed highwall, even under moderate seismic <br />conditions. However, even though the probability of a massive failure is small, one can expect a <br />certain amount of unraveling to occur at the mined face, once it is exposed to freeze-ths.wconditions. <br />So, don't be surprised to see a few small block or wedge failures along the highwalls a year or two <br />after mining ceases. <br />M baUlope.le <br />