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<br />COOL3 9-02-98 9:57 <br />Cooley Gravel PSCo Power Lines <br />150 _ 1 most critical surfaces, MINIMUM BISHOP FOS = 1.636 <br /> <br />120 <br />PSCo Towers <br />Mining\ghwall <br />a 90 11 <br />a> <br />_N <br />X <br />Q 60 <br />1-- <br />30 <br />0 ~~~_ <br />0 30 <br />Sand and Gravel <br />Alluvium <br />Clay Shale Bedrock <br />60 90 120 150 <br />X-AXIS (feet) <br />----- w 1 <br />180 210 240 <br />C~ <br />