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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 thirty foot buffer will be maintained from the permit boundary line to all <br />new excavations. There will be no excavation within 30 feet of the property line. <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. Connell <br />Resources, Inc. 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 />Hayden Gravel Pit, May 2013 U -1 <br />