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• • iii iiiiiiiiiiiii iii 999 Energy Fuels Mining Company RECEIVED Raon Creek Mine FEB 22 1999 Permit No. C-82-055 Division of Minerals & Geobgy 1998 Annual Hydrology Report (Period January 1, 1998 through December 31, 1998) Introduction This Annual Hydrology Report (AHR) presents summarized hydrologic monitoring data for the Raton Creek Mine operation for the 1998 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 1998, 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 discharges to streams. Groundwater Two grotmdwater wells are monitored at the Raton Creek Mine, identified as the Iuppa Well and the Refuse Well. Field and laboratory data wllected from the monitor wells are summarized as described below. Water quality data for the Iuppa Well and Refuse Well are shown on Tables 1 and 2, respectively. A review of monitoring data for each well through the period of this report indicate that the parameters are generally consistent with previous years. Both wells indicate a higher average level of dissolved solids, hardness, sulfate, magnesium, calcium, and sodium for the reporting period as compared to the 10-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 summarized on Table 3, and water levels data are presented graphically Figure 1. A review of water levels data shows stable levels during the reporting period with the exception of a rapid drop in the Refuse Well level during the 1st quarter of the year. Water well levels at the end of the reporting period were near the 11-year average shown on Table 3. 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.