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• <br />fills that have been constructed on the site are of a much <br />smaller extent than the crush in; and screening level fill. <br />As discussed earlier, they have been constructed from simi- <br />lar materials to the crushing and screening level fill and <br />general observations and recommendations can be extended to <br />them. <br />All fills on the site have generally a good appearance <br />and they do not carry any traces of failures. They are well <br />vegetated and they do not require any remedial measures. <br />u <br /> <br />As shown on Geologic Section C-C' (Plate 5), the fan <br />level fill is the only larger fill in the area. Since this <br />fill was placed on a fairly steep original ground surface, <br />a series of analyses was performed to evaluate its stability <br />(see Appendix C). The analyses have shown that the fill has <br />an acceptable safety factor of 1.41 only if the ground water <br />is safely below the original ground surface. With an increase <br />of ground caater level to 10 feet above the original ground <br />surface the safety factor decreases to 1.09. <br />~~ It is evident that keeping the fan level fill dry <br />III under all circumstances comprises the most effective (and <br />probably most economical) means of insuring its stability <br />~~ during the operations of the mine. Potential problems of <br />surface drainage of the fan level fill area should be ad- <br />dressed as soon as possible by implementing the recommen- <br />dations of the hlerrick fi Co. report. <br />~ Ponitoring of ground water levels within the fan <br />level fill is recommended; if the mine management accepts <br />the alternative of monitoring the crushing and screening <br />level fill, an inclinometer should probable be installed <br />within the fan level fill as well. <br />- .5 - <br />GEPHVDRO CONSULTING, INC. <br />