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-z- <br />As part of this work, we have reviewed analyses presented in our report <br />of May 18, 1981. The purpose of the review was to evaluate recent ground <br />~vater data as related to the slope stability analyses. The current condi- <br />tions in the spoil closely correlate with the analysis of perched water <br />table No. 5 (Fig 10 of the report). The results indicated a minimum fac- <br />tor of safety of 1.05 assuming significantly reduced strength parameters. <br />For probable strength conditions, the factor of safety approaches 1.4. <br />Based upon our analyses, it appears the likelihood of a deep-seated failure <br />is remote. There is a possibility of minor slumps or sloughing at the' <br />6,800 level if the water table rises significantly. The analyses are <br />consistent with the observed field conditions and further analysis is not <br />required at this time. Should subsequent monitoring indicate changes <br />with the ground water regime, we should be contacted to evaluate the <br />conditions. <br />If you have any questions concerning this information, please contact <br />our office. <br />Very truly yours, <br />V. <br />CTL/THOMPS~ N P ~'" "eQ~G` <br />a <br />gy 8287 <br />Darre V. Holmquist, P. _h, ~`~,•w~, <br />~'' , jE ~ <br />Revi '' <br />A <br />Robert W. Thompson, P. E. <br />DVH:RWT:ph <br />(15 copies sent) <br />