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Rpr 29 03 12:32p <br />RAG <br />Twentymile Coal Company <br />29515 Routt County Road # 27 <br />Oak Creek, CO 80467 <br />(970) 879-3800 <br />Apri124, 2003 <br />Tom Kaldenbach <br />Environmental Protection Specialist <br />Division of Minerals and Geology <br />1313 Sherman Street, Room 215 <br />Denver, Colorado 80203 <br />RE: Response to DMG Comments on Technical Revision 03-42, Reduction of <br />Monitoring Frequencies for Selected Hydrologic Sites, Permit No. C-82-056 <br />Dear Tom: <br />Twentymile Coal Company (TCC) has reviewed your comment letter dated April 22, <br />2003, and makes the following responses. <br />1.) Monitorine frequency. Reduced frequencies for bedrock and alluvial ground water <br />well field parameter and water quality monitoring, as well as natural springs sampling, <br />that DMG can approve have been noted and will be incorporated in updated Exhibit 14 <br />tables and submitted to DMG following fmal approval of TR 03-42. <br />2.) Elimination of monitorine sites. Elimination of the bedrock wells, alluvial wells, and <br />surface sites listed on page two of your comment letter have been reviewed. Please note <br />that TCC is further requesting the elimination of alluvial wells AVM-1 and AVM-1 along <br />Middle Creek in order to remain consistent with the elimination of associated surface <br />sites USGS 09243700 and MC-]. <br />TCC is requests that bedrock wells 97012TC, 97012TH, and 008-75-EFC be designated <br />as "deactivated", as discussed further under item 7 below. <br />It has recently come to my attention that site 8 has exhibited historical anomalies in <br />regards to flow balance calculations. TCC requests that requirements for periodic flow <br />measurements for site 8 be eliminated, while maintaining monitoring of field <br />parameters/water quality for site 8 and it's associated alluvia] well. 001-S-5. <br />3.) Possible elimination of 91M005 or 00G-BRDH-7. Per our conversation of this date, <br />TCC is requesting the "deactivation" of well 91M005. The reclamation of this site is <br />discussed under item 7 below. <br />p.2 <br />1\Envlaevision\kchn ical revision1TR03~2\COVer letter 3 <br />