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' III III I II IIIIIII III Doc Date:12/11/2001 <br />sss <br />1 EXHIBIT 12 <br />`~ EXPERIMENTAL PRACTICE INFORMATION <br />1) September 4, 1979-better rom Colowyo to Walter Heine, Direct, OSM, <br />request for Experimental Practice Permit. <br />2) September 28, 1979, Letter from OSM to John Ward, Colowyo, <br />concerning request for an experimental practice. <br />3) Department of the Interior, Office of Hearings, and Appeals: <br />Application for Review Notice of Violation No. 79-V-1-4. <br />4) Report on Preliminary Design of Open Pit Slopes (April, 1975) - W. <br />A. Wahler & Associates. <br />5) Report on Preliminary Design of Waste Dumps (November, 1975) - W. A. <br />Wahler & Associates. <br />6) Waste Dump Stability Study (April, 1977) - Golder Associates. <br />7) Evaluation of Streeter Canyon Waste Dump Fill Stability (June, 1978) <br />- Golder Associates. <br />8) Stability of the Spoil Fill in Streeter Gulch (July, 1978) - Tipton <br />•. and Kalmbach, Inc. <br />9) Consultation Slope Stability Colowyo Streeter Canyon Fill (August, <br />1979) - CTL/Thompson, Inc. <br />10) February 6, 1980 Letter from Jim Pendelton, hII.RD, to Fred Banta and <br />Dean Massey, MLRD, concerning slope stability analysis of the <br />Streeter Canyon Fill. <br />11) February 13, 1980 Letter from MLRD to Donald Crane, OSM, concerning <br />Streeter Fi11 as an Experimental Practice. <br />12) March 24, 1980 Letter from CTL/Thompson, inc, to Keith Kirk, OSM, <br />Concerning Slope Stability, Colowyo Streeter Canyon Fill. <br /> <br />13) August 14, 1980 Memorandum from John Hardaway and Keith Kirk, OSM, <br />to Donald Crane, OSM, concerning Colowyo Mine Streeter Canyon Fi11. <br />14) Slope Stability Analysis, Streeter Canyon Fill Revised <br />Configuration, May 18, 1981 by CTL/Thompson, Inc. <br />15) Technical Revision to Change the Status of Streeter Fill to Excess <br />Spoil Pile Huilt Under Alternative Design Standards. <br />16) Well Completion Report, W6700 Monitor Well <br />~9V151011 $11b111i11Bd 11 - LD -`I 8 <br />Revisbn No. w~ R - `i °l <br />~~._ <br />