2025-04-29_HYDROLOGY - M2007044

• Permit No: M2007044
• IBM Index Class Name: Hydrology
• Doc Date: 4/29/2025
• Doc Name: Hydrology Report
• From: Energy Fuels Resources Inc
• To: DRMS
• Annual Report Year: 2025
• Report Quarter_Month: 1
• Permit Index Doc Type: Hydrology Report
• Email Name: ACY
• Email Name: THM
• Media Type: D
• Archive: No

WHIRLWIND MINE,PERMIT NO.M-2007-044
FIRST QUARTER 2025 HYDROLOGICAL REPORT `
Attachment 5.PR Spring
Monitoring Sampled Inflow Rate Field pH Temperature Dissolved Specific Oxygen-
Date (Y/N) (gpm) (s.u.) (deg.C) Oxygen Conductance Reduction Comments
(mg/L) (US/cm) Potential(mV)
3/10/2008 Yes 4 to 5 8.1 8.6 NM NM NM Sunny,Ave. of 1 foot snowpack, see Table 2
6/19/2008 Yes 4.7 7.90 13.8 9.95 762 140 Sunny, Dry, see Table 2
9/8/2008 Yes 4.1 8.36 13.4 8.39 883 166 Sunny, Dry, see Table 2
12/15/2008 Yes 4.5 8.31 9.1 8.20 790 -35 Overcast,4"snowpack, see Table 2
2/10/2009 Yes 4.5 6.68 9.2 7.27 923 90 Sunny,Cold, 1-2"snowpack, see Table 2
4/20/2009 Yes 4.5 8.24 12.3 8.45 898 195 Sunny, Dry,see Table 2
8/11/2009 No 4.7 8.48 13.9 8.25 889 133 Sunny, Hot, Dry
12/1/2009 No 1.5 9.15 8.6 11.54 881 116 Flow restricted by vegetation
6/2/2010 Yes 2.3 8.52 13.2 2.27 880 172 Flow restricted by vegetation, see Table 2
7/28/2010 No 5.2 8.44 13.4 8.04 880 99 Sunny, Dry,Vegetation removed
11/4/2010 No 5.1 8.47 10.1 8.51 856 157 Sunny, Dry
4/18/2011 No 4.3 8.46 10.0 9.40 822 NM' Make-up for missed 1 Q11 monitoring, Sunny,warm, clear skies
5/24/2011 Yes 4.8 8.60 10.8 9.09 858 35 Lt showers,warm, see Table 2
8/15/2011 No 4.2 8.43 12.1 6.86 871 225 Partly cloudy,warm
10/25/2011 No 4.2 8.38 11.7 7.14 844 214 Overcast, light rain
3/28/2012 No 4.3 8.42 10.6 6.99 854 199 Dry and calm
5/30/2012 Yes 4.5 8.40 11.5 7.57 901 NM ORP Probe Broken
8/7/2012 No 4.0 8.32 13.8 6.97 869 223 Clear Water In tank
11/14/2012 No NM 7.56 11.6 45.7% 1194 96.4 Looks good enough to drink
3/18/2013 No 3.8 8.13 10.5 42.6% 794 219.8
6/4/2013 Yes 3.9 8.15 11.7 83.5% 844 261.2 water was clear
8/14/2013 N/A N/A N/A N/A N/A N/A N/A field notes were lost
11/12/2013 No 2.1 7.36 10.9 7.08 767 85.9
Q1 2014 No NM NM NM NM NM NM Inaccessible due to county road conditions
6/17/2014 Yes 2.0 7.7 12.5 4.4 878.0 108.E
9/9/2014 No 1.4 7.7 13.3 4.9 873.5 273
11/13/2014 No 1.5 6.6 10.0 4.7 1219.0 272
3/31/2015 No 1.6 7.0 10.0 5.0 1100.0 270
5/29/2015 No 1.5 7.6 12.1 8.0 859.2 301
8/5/2015 Yes 1.0 7.6 12.2 2.4 922.0 381
11/9/2015 No 0.5 7.6 10.8 5.0 862.8 341
3/31/2016 No 1.5 7.43 9.61 1.99 839.9 302
6/1/2016 Yes 0.6 6.49 12.42 0.91 867.1 464
8/3/2016 No 0.47 7.43 16.14 8.59 894.5 276
10/12/2016 No 0.10 7.08 13.92 8.59 861.9 287
3/24/2017 No N/A 6.99 12.02 9.20 785.4 400 Could not get flow rate due to pipe being clogged with roots.
6/7/2017 Yes 1.0 7.25 14.31 7.18 803.2 284 Flow rate was reduced due to pipe being clogged with roots.
9/8/2017 No 4.8 6.91 13.96 7.34 838.3 275 Cleaned out discharge line. Flow rate has improved.
10l20/2017 No 6.0 5.88 11.33 8.30 812.0 192