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-A <br />DEPARTMENT OF NATURAL RESOURCES <br />DIVISION OF WATER RESOURCES <br />O?CDlO <br />1 <br />tiQ j`? ?9d <br />H <br />1876 <br />June 6, 2008 <br />Mr. Joseph Dudash <br />Environmental Protection Specialist <br />Colorado Division of Reclamation Mining, & Safety <br />1313 Sherman St., Room 215 <br />Denver, CO 80203 <br />Re: Bowie No. 2 Mine, Permit No. C-1996-083, Permit Revision No. 10 <br />Dear Mr. Dudash: <br />Bill Ritter, Jr. <br />Governor <br />Harris D. Sherman <br />Executive Director <br />Dick Wolfe, P.E. <br />Director/State Engineer <br />Wayne I. Schieldt. P.E. <br />Division Engineer <br />The purpose of this letter is to provide the Division of Reclamation, Mining, & Safety (DRMS) with <br />comment on Bowie Resources, LLC (BRL) responses to DRMS' June 6,'2007 adequacy response for <br />the above referenced mining permit revision. Our comments are limited to those pertaining to the <br />potential impact of mine-induced seismic activity on the safety of Bruce Park Dam and are intended to <br />supplement of our previous letters to you dated June 11, 2003, May 16, 2006, and June 4, 2007. <br />It is our understanding that the Geotechnical Monitoring Plan for the Bruce Park Landslide prepared by <br />Yeh and Associates, Inc. dated March 26, 2008 has been included as Tab 20 in Volume IIIA in order to <br />address development of a threshold monitoring program for the landslide. Our office has reviewed the <br />proposed monitoring program and, has found it acceptable as a means of monitoring the landslide and <br />providing real time data along with a response action plan based on trigger levels and alarms. <br />Implementation of the monitoring program, as submitted, satisfactorily addresses our concerns of <br />providing a threshold monitoring program for the landslide during the proposed mining activity. <br />A concern by our office not addressed in BRL's response to DBMS is providing monitoring of Bruce <br />Park Dam itself during the proposed mining. While our office continues to support previous conclusions <br />that the risk of failure of Bruce Park Dam due to mine-induced seismic loading appears minimal, we still <br />feel that including monitoring of the dam is imperative. As stated in our May 16, 2006 letter, we <br />recommend including periodic measurement of the existing piezometers and movement monuments on <br />the dam crest as a part of the overall geotechnical monitoring plan. <br />Water Division 4 • Montrose <br />P. O. Box 456 (1871 East Main Street) • Montrose, CO 81402 • Phone: 970-249-6622 • Fax: 970-249-8728 <br />www.watenstate.co.us