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1 <br />'• <br />1 <br />1 <br />1 <br />1 <br />1 <br />1 <br />1 <br />1 <br />1 <br />,• <br />t' <br />r <br />Rockfall Hazards Study <br />Northern Mining District <br />Twentymile Coal Company <br />Foidel Creek Mine, Colorado <br />Prepared For <br />Twentymile Coal Company <br />29515 Routt County Road #27 <br />Oak Creek, Colorado 80467 <br />sy <br />SubTerra, Inc. <br />8112 304th Ave. SE, Suite B <br />Preston, Washington 98050 <br />Project: 99-15 ~~ Terra 1 n c. <br />May, 1999 <br />