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energy fuels mining company • I~~ I~IIr!"~I""I~I p. o. box 459 tlorence, Colorado 81226 January 30, 2001 phone 17191 784-6395 tax f719) 784-4352 RECE11/Ep Mr. Kent A. Gorham Division of Minerals and Geology 1313 Sherman Street, Room 215 Denver, Colorado 80203 RE: Response to Questions - 1998 Annual Hydrology Report Review Raton Creek Mine, Your file No. C-82-055 Dear Kent: FEB 22 2001 Division of Minerals 8 Gec~c,.., The Division review of Energy Fuels Mining Company (EFMC) 1998 AHR submittal resulted in a letter with five questions. Following are responses to these questions, numbered the same as in your letter. Responses: 1. EFMC has reviewed its field data from well monitoring in 1998, and it is apparent that the field data was obtained for the wells in March, along with the well water levels. The data was not transferred to the usual log sheet and the original data was subsequently lost. 2. Discharge water quality parameters for the sediment are to be sampled on a monthly basis pursuant to the approved NPDES permit. EFMC personnel measure discharge water quality, and take samples if necessary, on an opportunistic basis when there is a discharge. During some months, there are no discharges. Similarly, the permanent diversion seldom has measurable flow events. Monitoring and sampling are done by EFMC on an opportunistic basis when flow is present. 3. No response required. 4. The Refuse Well water level dropped to an unprecedented level in April 1998. The graphical data shown in the AHR for the well indicate that the month before and after show a gradual decrease and increase respectively in well levels. Only subsurface changes in groundwater rechazge due to precipitation could account for the unusual low water level. 5. To address this question (parts a through e), EFMC is preparing and will submit a minor revision by March 1, 2001.