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iii iiiiiiiiiiiii iii <br />999 <br />STATE OF COLORADO <br />DIVISION OF MINERALS AND GEOLOGY <br />Depanmenl of Natural Re<ources <br />1113 Sherman SL, Room 215 I+~ <br />Denver, Coloradu 80?Ol II <br />Phone: 13031 8(,6-35fi 7 <br />F AY:1303183?-8106 <br />DEPARTMENT OF <br />NATURAL <br />November 18, 1996 j2ESOURCES <br />Forrest Luke Roy Romer <br />Governor <br />Environmental Manager la mess Fo<nne,a <br />Trapper Mining Inc. EYCCU1ivep„~,°, <br />P.O. BoX 187 <br />Craig, CO 81626 ""`h'e' ~' `°"R <br />Drvi:Ion Direno~ <br />Re: Technical Revision No. 69, Ashmore Pit Slide Remediation, Trapper <br />Mine, Permit No. C-81-010, Trapper Mining, Inc. <br />Dear Mr. Luke: <br />The Division has completed its review of Trapper's September 20, 1996 <br />monitoring report for the Ashmore pit slide remediation project. The <br />Division agrees with Trapper's conclusion that the slide area appears <br />to have been stable throughout the past year. The two ppiezometers <br />showed minor water level fluctuations, reflecting £he annual <br />precipitation cycle. In addition, the piezometer lower on the slope <br />shows a consistently higher water table. The flow from the french <br />drain installed within the regraded slide deposit showed relatively <br />consistent flows, usually less than 0.5 gpm. No problems were detected <br />with either diversion ditch. Finally, none of the slope stability <br />markers showed any detectable movement. <br />Therefore, the Division grants Trapper's request to discontinue the <br />slide monitoring program. Stipulation No. 14, which was attached to <br />TR-69 and which required the monitoring program and final report, has <br />been complied with. <br />However{ the Division requests that Trapper retain the two <br />piezome ers, the slope stability markers, and the french drain outfall <br />monitoring point. In this way, Trapper can restart the slide <br />remediation monitoring program should there be any suspicion of <br />further movement of the slide. Also, the Division requests that the <br />two diversion ditches, one above the slide area and the other across <br />the slide area, be retained. If Trapper agrees with these requests, <br />please send the Division a letter stating so. <br />If you have any questions, please contact me. <br />Sincerely, <br />os h ~ Dudash <br />nvironmental Protection Specialist <br />C:\WP51\TRAPPER\TR69RPT <br />