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-8- <br />• Although there is a passibility of a perched water table developing at <br />the top of each lift, analyses suggest that the probability of a deep- <br />seated failure in these areas is relatively low. Even considering substantial <br />weathering of the spoil and reduced strength, the factor of safety is <br />still above 1.0. <br />In our opinion, the addition of spoil to the existing fill does not <br />significantly reduce .the factor of safety or affect the stability of the spoil <br />pile. The factors of safety provided in this report are lowerbound conditions <br />and do not reflect strength gains due to consolidation, dessication, etc. <br />ADDITIONAL INVESTIGATION <br />As requested by the State of Colorado,Mined Land Reclamation Board, a <br />• series of ground water monitoring wells are being installed. The wells will <br />be located at the 6900 and 6600 levels. There are to be two wells at 6900; <br />one extending to bedrock and one extending to the 6800 level. The bedrock <br />well will provide data on overall ground water levels. The well at the 6800 <br />level will indicate perched water,should it develop. The well at 6500 level <br />is provided to measure ground water levels adjacent to Good Spring Creek.. <br />These wells are currently being installed and monitored. As results be- <br />come available, we will prepare a supplemental report which will include drill <br />logs, measurements, and where necessary, slope stability analyses to reflect <br />field conditions. <br />LIMITATIONS <br />The results and conclusions presented in this report were based upon <br />• analyses of the slope configuration provided by Colowyo and strength and <br />