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STATE OF COLORADO <br />DIVISION OF MINERALS AND GEOLOGY <br />Department of Natural Resources <br />137 3 Sherman St., Room 215 <br />Denver, Colorado 80203 <br />Phone: (303) 866.3567 <br />FAX: (303) 832$106 <br />July 22, 2003 <br />COLORADO <br />DIVISION O F <br />MINERALS <br />GEOLOGY <br />0.EC LAMATION•MIN ING <br />SA FET Y•SU EN CE <br />George Patterson giu Owens <br />Energy Fuels Mining Company Governor <br />P.O. Box 449 Greg E. watcher <br />Florence, CO 81226 Executive Director <br />Ronald W. Cattany <br />RE: 2002 Annual Hydrology Report Review Divisi°" Direc[°' <br />Raton Creek Mine, PQrRllt iVO. C-82-OSS Natural Resource Trustee <br />Mr. Patterson: <br />The Division of Minerals and Geology has completed review of the 2002 Annual Hydrology <br />Report (AHR) for the Raton Creek Mine. <br />Monitoring Freguencv <br />1. Text on page one and Figure 1 and Figure 2 seem to indicate that quarterly water level <br />and field parameters were collected. However, these data are not reflected in Table 2 <br />and Table 3. Please revise the tables to include all data required to be collected and <br />reported. <br />2. Monitoring frequency, specific to laboratory sampling requirements, was met on a semi- <br />annual basis for the luppa well and the Refuse well. <br />Water Quantity and Quality <br />3. No significant changes attributable to mining have occurred regarding water levels in the <br />two monitoring wells. Water quality shows no degradation affecting any probable use. <br />Field conductivity (EC) values are noted substantially less (845 umhos/cm) than the total <br />dissolved solids (TDS) value of 1655 mg/I for the luppa well. A similar effect was noted <br />in the Refuse well. Normally, TDS is less than EC, with a ratio of about .75 as a general <br />rule of thumb. Again, the DMG requests that EFMC check the calibration of your field <br />equipment. <br />Thank you for your efforts to complete hydrologic monitoring in accordance with the approved <br />plan. If you have any questions, please call me. <br />Sinc ly, ~~l /9~--- <br />K or am 7!'// <br />Environmental Protection Specialist II <br />Office of Office of Colorado <br />Mined Land Reclamation Active and Inactive Mines Geological Survey <br />