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Energy Fuels Coal, Inc. Southfield Mine - 2004 Annual Hydrology Report April 5, 2005 <br />well in 1994. In 2003, it was converted to a monitoring well and will be referred to as the well <br />MW-NW. <br />In Technical Revision 35 (TR-35), the groundwater monitoring schedule was reduced from <br />quarterly to semi-annually and is conducted in June and December. Field measurements and <br />laboratory data for active monitoring wells are summarized in the following discussions. Raw field <br />and laboratory data for the 2004 water year are provided in Appendices A and B respectively. <br />Measured water levels for all Mine Area monitoring wells are summarized in Table 4, Monitor Well <br />Water Levels, for the years 2000-2004. Table 4 Historical, in Appendix A, presents ground water <br />levels from 1980-1999. The historic water level data are presented graphically for the five <br />monitoring wells (including historical information for Wells MW-8 and MW-10) on Figures 3, 4, 5, <br />6, and 7. <br />Water levels for well MW-16 have shown some cyclic/seasonal fluctuations. It was dry from <br />December 2001 until December 2003 (except for June 2003), possibly associated with drought <br />conditions, but has retained a very little amount of water in recent years. The well has silted up to <br />approximately 110 feet below ground surface. Well MW-23 has demonstrated steadily declining <br />water levels since July of 1984. Water levels for Well MW-65 have generally remained stable with <br />minor fluctuations off 10 feet. MW-NW has been dry since monitoring was initiated in early 2003. <br />Water quality data for monitoring wells MW-10, MW-16, MW-23, MW-65 and MW-NW are <br />provided on Tables 5, 6, 7, 8, and 8A, respectively. These tables provide any analytical results for <br />2004 and the minimum, maximum and average values calculated using all historical monitoring <br />data. Consistent with the historic monitoring schedule, water quality samples were not obtained for <br />Well MW-8. Review of historic water quality monitoring data indicates spike values for several <br />parameters and minor to moderate variances in ground water quality over time. The most <br />discernable patterns of changing ground water quality over time are listed below. <br />• MW-10 -General water quality has been fairly consistent over time <br />- Increasing trends for Ortho Phosphorous (until 1988) and for calcium <br />- Decreasing trends for conductivity, total dissolved solids, sodium and bicarbonate; <br />• MW-16 -Generally water quality in this well is erratic <br />- Increasing trends for conductivity <br />- Erratic data for sodium, sulfate, bicarbonate, calcium and chloride <br />• MW-23 -Generally consistent water quality <br />- Slight increasing trends for conductivity, total dissolved solids, bicarbonate and <br />sodium <br />• MW-65 -Generally very consistent water quality over time <br />- Slight decreasing trends for sodium and bicarbonate <br />The historical averages in each monitoring well were compared to the Colorado Groundwater <br />Standards provided in Regulation no. 41 -Basic Standards for Ground Water. The historical <br />averages exceeded a standard only for the following parameters and wells. <br />• Iron, dissolved - MW-10, MW-16 and MW-23 exceeded the Secondary Drinking Water <br />6417!2004 annual hyd rpl.doc NWCC INC. Page8 <br />