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<br />COOL3 9-02-98 9:57 <br />150 <br />120 <br />Cooley Gravel PSCo Power Lines <br />1 most critical surfaces, MINIMUM BISHOP FOS = 1.636 <br />PSCo Towers <br />a 90 <br />a~ <br />N_ <br />X <br />Q 60 <br />I <br />30 <br />Mining Highwall <br /> <br />Sand and Gravel <br />Alluvium <br />Clay Shale Bedrock <br />0 <br />0 <br />30 60 90 120 150 <br />X-AXIS (feet) <br />180 210 240 <br />