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ZG("zG z� <br /> GEOTECHNICAL STABILITY EXHIBIT EXHIBIT U <br /> There are no buildings or ar_y 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 /> excavations.All reclaimed areas will be restored to relatively flat(5-15%)slopes except for the <br /> side slope.The sidelopes will be mined to the final reclaimed slopes of 3H:1V down to a foot <br /> below water level,then 2H:1 V to the pit bottom.The surface material of these reclaimed slopes <br /> will be topsoil. <br /> The side slopes will range from sand-silt-clay with slightly plastic fines to silty gravels,poorly <br /> graded gravel-sand-clay. <br /> Design factors <br /> In order to determine the stability of this slope,the 2H:1 V lower slope will be evaluated for <br /> safety factor.Based on Figure U 1,from Huang,shows typical internal angles of friction for <br /> various materials.Assuming that the gravel is classified as GC,clayey gravels,poorly graded <br /> gravel—sand-clay,this material has an internal angle of friction of approximately 34 degrees. <br /> Graff Pit,March 2012 U-2 <br />