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III IIIIIIIIIIIIIIII <br />999 <br />STATE OF COLORADO <br />DIVISION OF MINERALS AND GEOLOGY <br />Deparunenl of Natural Resources <br />1313 Sherman St., Room 215 <br />Denver, Colorado BO203 <br />Phone: (303) 866-3567 <br />FAX: (303) 832-8106 <br />Interoffice MEMORANDUM <br />~~. ~ <br />DIVISION OF <br />M I N E R A L ~~ <br />GEOLOGI' <br />R EC LAM ATION~ <br />MINING•SAFETI'I <br />Bill Owens <br />to: Joe Dudash ~iQy~ c°ver^°r <br />from: B ron G. W2~~~@h% Greg E Walcner <br />y QE~~ecmrvc Dueclor <br />subject: Request for Assistance, Compaction Data, Bowie No. 1 Mine, Permit No. C-~Mi2nael R Enng <br />038, Bowie Resources Limited Di,ision Dueclor <br />date: August 22, 2001 <br />reference: Your memo of August 1, 2001, same subject <br />I have reviewed the compaction data provided. I see no red flag. The data reports that all of the <br />sites tested had relative compaction densities above or equal (in only one incidence) to 85%, and <br />at moisture contents above optimum moisture contents. I also reviewed the information attached. <br />This information is that this was a desired condition (85% relative densities and at moisture <br />contents above optimum to reduce adverse affects of higher moisture contents on the degradation <br />of soil strength). <br />Two things, however, come to mind. As the Division of Minerals and Geology seems to have <br />allowed placement of the soils at a relative density of 85%, a change to the permit (page 60) to <br />reflect this (90% to 85%) would be in order. <br />Second, you memo of August 1, 2001, indicates that Jim Stover will perform strength tests with <br />the compaction achieved in the field. Based on these tests, I recommend the they (also) provide <br />stability analysis for the critical sections (this seems to be implied, as your memorandum <br />indicates that they expect a factor of safety to be around 5). <br />Please find your memo and materials attached. Please see me if you have any questions. <br />Cc: Dan Hernandez <br />File: C:\WPDOCS\Support\Bowie 1 038Uom compaction support.doc <br />