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<br />GEOTECHNICAL STABILITY EXHIBIT <br />There are no buildings or any structures outside the permit area which could be affected by the <br />operation. The final slopes of the reclamation, as shown on Map Exhibit E-3 show [ha[ 2H:1 V <br />slopes will be left for a height of 11 fee[ after mining. The existing gravel material that will make up <br />the slope is very hard and will require considerable breakout force by the excavation equipment. <br />The material is somewhat cohesive and has well-cemented fines. This results in slope stability <br />parameters of cohesion and internal angle of friction of high values. When this is combined with a <br />relatively mild slope of 2H:1V, it is expected that the safety factor for this short slope will be above <br />1.7. I, Greg L.ewicki, P.E., with many years of experience in mine slope safety analysis in Colorado, <br />state that this is true. <br />The single phase powerline of San Isabel Power Association has two single wood poles which are <br />located within the permit area. A letter included in Exhibit G from San Isabel discusses their <br />requirements for the protection of the line, which are incorporated into the plans for this pit. the <br />reclaimed slopes around the lines will be2H:1V. <br />Ferrero Pit 2/00 38 <br />