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Energy Fuels Mining Company Raton Creek Mine Permit No. C-82-055 1999 Annual Hydrology Report (Period January 1, 1999 through December 31, 1999) Introduction This Annual Hydrology Report (AHR) presents summarized hydrologic monitoring data for the Raton Creek Mine operation for the 1999 reporting period. In addition, discussion and comparison of these data with previous reporting periods are incorporated within the report. The AHR is prepared and submitted in accordance with Rule 4.05.13 of the Regulations. Monitoring data compiled for the AHR include the period from 1987 through 1999, the period that Energy Fuels has operated the mine. Relevant monitoring data collected and presented in this AHR includes: groundwater quality and levels; diversion flow quantity and quality; precipitation quantity; and quantity and quality of dischazges to streams. Groundwater Two groundwater wells are monitored at the Raton Creek Mine, identified as the Iuppa Well and the Refuse Well. Field and laboratory data collected from the monitor wells are summarized as described below. Water quality data for the Iuppa Well and Refuse Well are shown on Tables 2 and 3, respectively. A review of monitoring data for each well through the period of this report indicate that the monitored parameters are generally consistent with previous years. Both wells indicate slightly higher levels of sodium, bicarbonate, and ortho phosphorus for the reporting period as compared to the preceding 11-year average. These data are close to the average values and may be a short-term trend as mentioned in the previous report. Future monitoring will substantiate the consistency of potential trends. Water quality in both wells remains within acceptable ranges for material damage criteria. Well levels for both monitoring wells are presented graphically on Figures L and 2 for the Refuse and Iuppa Wells, respectively. A review of water levels data shows slightly higher levels in the Refuse Well during the reporting period. Water well levels at the Iuppa Well tended to fluctuate similar to previous trends. This effect is likely influenced by the landowner's use of the well. The approved ground water monitoring program adequately monitors potential impacts of mining on the ground water system. The data collected through the period of this report indicate that no significant ground water impacts have occurred as a result of mining.