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1 <br /> <br />1.0 INTRODDCTION <br />1.1 OBJECTIVE ~j~ SCOPE <br />western Associated ,Coal Company requested the services of Rocky <br />' Mountain Geotechnical, Inc. to prepare a geotechnical <br />investigation involving a slope stability analysis for the new <br />portal face and bench fill for the Red Canyon Mine. This work <br />' involved performing a geological reconnaissance, a review of <br />previous soil boring and laboratory testing data and a soil and <br />' rock slope stability analysis for various slope configurations <br />supplied to Rocky Mountain Geotechnical by Western Associated <br />I Coal Company. <br />1.2 PROJECT LOCATION <br />' The site is located approximately three miles northwest of <br />Cedaridge, Colorado in Delta County as shown on Figure 1. <br />1 <br />1 1.3 PR T._T DESCRIPTION <br />It is our understanding that the proposed project will involve <br />construction of a new portal face requiring the construction of a <br />portal cut and bench fill. Several slope and bench <br />configurations alternatives were supplied to Rocky Mountain <br />' Geotechnical for slope stability investigation. The steepest <br />excavation through the rock and soil at the site submitted was <br />t calculated to be approximately 0.5 vertical to 1.0 horizontal. <br />The highest bench fill for the various alternatives was estimated <br />1 to be approximately 40 to 50 feet high with slopes ranging from <br />' 2H:1V to 4H:1V. After the mining operation has ceased, the mine <br />' 1 <br />