2015-02-12_REVISION - C1981014

• Permit No: C1981014
• IBM Index Class Name: Revision
• Doc Date: 2/12/2015
• Doc Name: Adequacy Review
• From: DRMS
• To: Energy Fuels Coal, Inc
• Type & Sequence: TR43
• Email Name: LDS
• Email Name: DIH
• Media Type: D
• Archive: No

George V. Patterson, Energy Fuels Coal, Inc.
Page 13
February 12, 2015
Table 2: Baseline groundwater quality (data from page 2.04.7 -17)
Parameter
Baseline
max
Baseline
min
Baseline
mean
Most stringent standard from tables 1 -4
of Reg. 41, for reference only
pH
8.85
6.2
7.8
6.5 -8.5
Conductivity @ 25degC
(µmhos /cm)
3290
210
1386.8
Temp (deg C)
24.5
10
1 15
TDS (mg /L)
2780
156
941.5
(1.25 x background)
Bicarbonate (mg /L)
830
150
419.7
Ca (mg /L)
139
1.07
25.2
CI (mg /L)
161
3.2
47.6
250
Mg (mg /L)
21
0
4.4
N, ammonia (mg /L)
19.8
0
3.3
N, nitrate /nitrite (mg /L)
24.8
0
2.5
10
P, ortho (mg /L)
8.1
0
0.6
P, total (mg /L)
Na (mg /L)
980
28.5
328.4
SO4 (mg /L)
863
9.75
305.1
250
As (mg /L)
0.002
0.000
0.000
0.010
Cd (mg /L)
0.010
0.000
0.001
0.005
Fe (mg /L)
24.200
0.000
1.025
0.300
Mn (mg /L)
0.980
0.000
0.072
0.050
Hg (mg /L)
0.003
0.000
0.000
0.002
Se (mg /L)
0.032
0.000
0.003
0.020
Zn (mg /L)
0.272
0.000
0.051
2.000
The four groundwater monitoring points in the approved water monitoring plan can be loosely
described as: (i) up- gradient, MW23; (ii) down - gradient, MW65; (iii) in the mine workings,
MWNW and; (iv) surrounded by mine workings, MW 16. It is likely however that groundwater
flows to date have been towards the mine workings from MW65, so data from that well does not yet
include water that has been in contact with the mine workings. Furthermore, since no data has yet
been reported from MWNW the quality of water within the mine cavity cannot be assessed. Taking
these two points into account, the only water quality trends that could yet be assessed are up-
gradient of the mine.