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<br />Brian Munson -2- June I6, 1981 <br />approximate original contour is not necessarily required. I suggested <br />that the operator should analyze their proposed "partial" backfilled <br />configuration to demonstrate conformance with the requirements of <br />Rules 4.27 and 4.14. <br />Bill Bozworth discussed his intention to pursue waiver of the required <br />road cut slope static safety factors of the permanent permit regulations, <br />based upon pursuit of the alternative demonstration that such a configuration <br />would not impact the environment adversely. I observed that I believe such <br />a demonstration should discuss what potential hazards would be entailed by <br />the substandard static slope safety factors. Ideally, the operator should <br />demonstrate that the worst case potential slope failure occurrence would <br />not have an adverse environmental impact. Or, if an impact were anticipated, <br />that such impact could be prevented or mitigated. <br />McClane Canyon <br />Geotechnical concerns at the McClane Canyon mine site appear Limited to a <br />steep cut slope behind the office trailers on the mine bench and a highwall <br />overhang above the existing portal entries. Both of these problems appear <br />to be limited to operational concerns. Proper reclamation at the cessation <br />of mining should mitigate these hazards. <br />mab <br />cc: Fred Banta <br />