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~ ~txmb ~rt~ ~~~~~~~~ <br />CONSULTING GEOTECHNICAL ENGINEERS AND MATERIAL TESTING <br />April 13, 2000 <br />Bowie Resources Limited <br />P.O. Sox 483 <br />Paonia, Colorado 81428 <br />Attention; Mr. William Bear, Jr. <br />PN: M99238GE <br />Subject: Geotechnical Engineering Study for the <br />Proposed Sediment Pond "8" near <br />Paonia, Colorado <br />Mr. Sear: <br />This letter is in response to a letter from the State of <br />Colorado, Division of Minerals and Geology dated April 11, 2000. <br />The letter identifies two items concerning the geotechnical <br />engineering report for the subject project. <br />Item 1 requests that additional slope stability analysis o£ the <br />• exterior slopes be conducted which include the Fire Mountain Canal <br />influences. Based on the site plan provided by Mr. Jim Stover.the <br />crass section we analyzed assumed that the canal was about twenty- <br />five (25) feet horizontal distance away from the toe of the <br />exterior slope. We performed additional sensitivity analyses with <br />the Fire Mountain Canal to within about £ive (S) feet of the toe of <br />the exterior slope to help identify the influences of the canal <br />when closer to the exterior slope. <br />The results of the stability analyses indicated a calculated <br />theoretical factor of safety for the configuration with the canal <br />about twenty-five (25) feet away from the slope toe similar to the <br />calculated theoretical factor of safety for our original study <br />dated January 26, 2000. This analysis indicates that the canal at <br />that location does not influence the slope. <br />The sensitivity slope stability analysis with the canal located <br />abouC five (5) feet of the slope toe indicated a slight reduction <br />in the calculated theoretical factor of safety to about 1.99. This <br />is greater than a minimum suggested calculated theoretical factor <br />of safety of 1.5. <br />The results of our additional slope stability analyses are <br />presented on the attached figures. It is our opinion based on the <br />results of our additional slope stability analysis that the Fire <br />Mountain Canal has only minor effect on the proposed sediment pond <br />• <br />P. O. 90X 7866 P. O. 00%OOeb ~~~ ~) 1 <br />DRANO JUNCTION. CO 61501 tlOMR09E, CO 8702 `~~ /~ <br />(970) 7{5.650{ (970) ]69.7164 ~ PPRwCLI <br />FAX: (070)746•%66 FAX: (67D)349J767 <br />5~8~00 <br />2,a BODO DR. <br />OURANGO.CO 0170, <br />(670)259-5095 <br />FAX: (97017817515 <br />