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GEOTECHNICAL STABILITY EXHIBIT EXHIBIT U <br />There are no buildings or any structures outside the permit area which could be affected by the <br />excavation. A minimum twenty foot buffer will be maintained from the permit boundary line to <br />all excavations. There will be no excavation within 30 feet of the property line. All reclaimed <br />areas will be restored to relatively flat ( <3.5 %) slopes since the terrace will simply be lowered. <br />The initial incision of the pit into the natural berm will be done at an angle of 3H:1 V, which is <br />more than stable for any in -situ gravel deposit. <br />Figure U -1, from Huang, shows typical internal angles of friction for various materials. <br />Assuming that the gravel is classified as GC (clayey gravels, poorly graded gravel- sand - clay), <br />this material has an internal angle of friction of approximately 34 degrees. <br />Based on the demonstration in this section, no damage waivers will be supplied. Rocky <br />Mountain still commits to repairing any structure outside the permit area in the case that a <br />structure is damaged as the result of mine - related activities for this permit. <br />Uncompahgre Pit, February 2013 U -1 <br />