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20 Surfaces initiate from each of 20 points equally spaced <br /> along the ground surface between x = 260.0 ft <br /> and x= 320.0 ft <br /> Each surface terminates between x= 124.0 ft <br /> and x= 130.0 ft <br /> Unless further limitations were imposed,the minimum elevation <br /> at which a surface extends is y= 4710.0 ft <br /> 7.0 ft line segments define each trial failure surface. <br /> --------------------- <br /> ANGULAR RESTRICTIONS <br /> --------------------- <br /> The first segment of each failure surface will be inclined <br /> within the angular range defined by : <br /> Lower angular limit :_ -45.0 degrees <br />