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I STABILITY ANALYSIS: <br />Stability conditions were analyzed utilizing a computer- <br />assisted limit equilibrium method of slices. This particular <br />program utilizes Spencer's method for analysis which is capable <br />of analyzing stability conditions not only in circular modes of <br />failure but also for randomly specified shear surfaces. Areas <br />investigated in this particular stability analysis were as <br />follows: <br />Section A - potential site for the construction of a new fan <br />portal facility located approximately 100 to 200 feet west of the <br />existing main entry portal. <br />Section B - the area immediately above and below the <br />existing main entry portal. <br />Section C - another potential site for the location of a new <br />intake or fan portal located approximately 100 feet east of the <br />main entry portal. <br />Section D - the area immediately above and below the existing <br />' fan portal. <br />I Section E - the extreme eastern end of the existing access <br />road which may be subject to modification for the construction of <br />a larger radius turn in the access road in that area. <br />The area of the site has been subject to geologic and <br />engineering geologic mapping by Mr. Walter R. Junge of the <br />Colorado Geological Survey. Results of this mapping indicate <br />that the site is located in an area of known instability. it was <br />7 therefore anticipated that results of analyses might yield <br />J factors of safety very near unity for many of the conditions <br />I considered. <br />7 <br />