DRC-2023-002344 - 0901a068811b1260

State ofUtah
SPENCER J. COX
Governor
DEIDRE HENDERSON
Lieutenant Governor
TO: Phil Goble
Department of
Environmental Quality
Kimberly D. Shelley
Executive Director
DIVISION OF WASTE MANAGEMENT
AND RADIATION CONTROL
Douglas J. Hansen
Director
MEMORANDUM
PIZG
FROM:
DATE:
Dean Henderson #f
March 3, 2023
SUBJECT: Review of the November 15, 2022 3rd Quarter 2022 Nitrate Monitoring Report (DRC-
2022-023036) for the Nitrate Contaminaticm Investigation, Energy Fuels Resources
(USA) Inc. ("EFRI") White Mesa Uranium Mill, near Blanding, Utah
The Utah Division of Waste Management and Radiation Control ("Division") has reviewed the EFRI
November 15, 2022, 3rd Quarter, 2022 White Mesa Uranium Mill Nitrate Monitoring Report ("Report")
for the Nitrate Contamination Investigation.
For the review of this Report the following regulatory enforcement documents were used:
• Energy Fuels Resources (USA) Inc., White Mesa Uranium Mill, Groundwater Discharge Permit
No. UGW370004, signed March 19, 2019 ("Permit").
• Corrective Action Plan for Nitrate White Mesa Uranium Mill near Blanding, Utah, May 7, 2012,
("CAP") approved December 12, 2012.
• The EFR Quality Assurance Plan ("QAP") August 22, 2019 (Revision. 7.6)
REVIEW
The CAP requires the 3rd quarter Nitrate Monitoring Report for the Nitrate Contamination Investigation
to be submitted to Division on or before December 1, of each year. The Report was received by the
Division on November 21, 2022 (date of Report November 15 , 2022) which meets the CAP
requirement.
Monitor Wells Sampled and Parameters Analyzed
The following monitor wells were sampled and analyzed for inorganic chloride and nitrate+ nitrite (as
N), and field data work sheets were filled out for each well as required in the CAP:
DRC-20 195 North 1950 West• Salt Lake City, UT
Mailing Address: P 0. Box 144880 • Salt Lake City, UT 84114-4880
Telephone [phone] • Fax (801 ) 536-0222 • T.D.D. (801) 5364284
www.deq.utnh.gov
Printed on I 00% recycled paper
DRC-2023-002344
Page 2
TWN-1, TWN-2, TWN-3, TWN-4, TWN-7, TWN-18, TNW-20, TWN-21, TW4-22 (pumping well),
TW4-24 (pumping well), and TW4-25 (pumping well), and Piezometer 1, Piezometer 2, and
Piezometer 3A.
Groundwater Head Monitoring
For the 3rd Quarter, 2022 depth to groundwater was measured in the following wells and/or piezometers
as required in Part I.E.3 of the Permit:
• The quarterly groundwater compliance monitoring wells.
• Existing monitoring well MW-4 and all of the temporary chloroform investigation
wells.
• Piezometers P-1, P-2, P-3A, P-4 and P-5.
• MW-20, MW-22 and MW-34
• Nitrate monitoring wells.
• The DR piezometers which were installed during the Southwest Hydrologic
Investigation.
In addition to the above, depth to water measurements are routinely observed in conjunction with
sampling events for all wells sampled during quarterly and accelerated efforts, regardless of the
sampling purpose. All well levels used for groundwater contour mapping were measured and recorded
within 5 calendar days of each other.
The monitoring wells were purged using the three approved QAP well purging strategies and meet QAP
requirements for each strategy:
1. Purging two casing volumes with stable field parameters for specific conductivity,
turbidity, pH, redox potential, and water temperature (within 10% RPD):
Wells: TWN-1, TWN-4, and TWN-18.
2. Purging a well to dryness and stability of field parameters for pH, specific conductivity, and
water temperature only after recovery:
Wells: TWN-3, TWN-7, TWN-20, and TWN-21
3. Continuously Pumped Wells that are considered sufficiently evacuated to immediately
collect a sample:
Wells: TWN-2, TW4-22, TW4-24, and TW4-25.
Detection Limits
All sample sets were measured and reported to the required QAP reporting limits.
Page 3
Sample Duplicates
One duplicate sample was collected at TWN-18 and identified as TWN-65. The duplicate sample
analytical results for this sample/duplicate pair QA/QC were within the 20% acceptance limits as
required in the QAP except for nitrate (see Table 2 below).
Holding Times
The method holding times for each parameter for samples collected at each monitor well were received
and analyzed within the required holding times in the QAP.
Receipt Temperature
All samples were received within the required QAP temperature limit of 6° C.
Analytical Methods
Chloride and nitrate+ nitrite (as N) were analyzed for methods consistent with the requirements of the
QAP.
Estimation of Pumped Nitrate Mass Removal
An estimated 62 lbs. of nitrate were removed from the chloroform pumping wells (MW-4, MW-26,
TW4-1, TW4-2, TW4-4, TW4-l 1, TW4-19, TW4-37, TW4-39 and TW4-41) and the nitrate pumping
wells (TWN-2, TW4-22, TW4-24, and TW4-25). Of the 62 lbs. removed, approximately 31 lbs. was
removed by the nitrate pumping wells. In the attached Table 3, the Division shows calculations that
· verify these reported estimates.
Reporting
The Report included the following information as required in the CAP:
a) Introduction
b) Sampling and Monitoring Plan:
i. Description of monitor wells sampled;
ii. Description of sampling methodology, equipment and decontamination
procedures;
iii. Identification of all quality assurance samples, e.g. equipment blanks
duplicate samples, etc.
c) Data Interpretation:
1. Interpretation of groundwater levels, gradients, and flow directions. The interpretation will
include a discussion on: 1) current site groundwater contour map, 2) hydrographs to show
groundwater elevation in each monitor well over time, 3) depth to groundwater measured and
groundwater elevation from each monitor well summarized in data table that includes historic
groundwater level data for each well, 4) calculations documenting quarterly nitrate mass
removed by pumping;
11. Interpretation of all analytical results for each well including a discussion on: 1) a current
nitrate isoconcentration map, 2) graphs showing nitrate concentration trends in each well
Page4
through time and, analytical results for each well summarized in data table that includes
historic analytical results for each well; and
iii. An electronic copy of all laboratory results for groundwater quality monitoring conducted
during the quarter will be provided to the Executive Secretary.
d) Conclusions and Recommendations
e) Copies of EFR field reports, laboratory reports, and chain of custody forms.
Evaluation of the Nitrate Contaminate Plume and Its Associated Contaminants
The groundwater monitoring data appeared to show that the nitrate contaminate plume ("Plume") is
bound by up gradient, cross gradient, and down gradient wells that have nitrate concentrations below the
Utah 10 mg/L GWQS.
Based on water level data, groundwater contour, and capture zone maps in the it appears that up-gradient
of pumping wells TW4-19, TW4-22, TW4-24, TW4-37, and TW4-39 the nitrate plume appears to being
captured.
Conclusions on Compliance with the CAP, QAP
Per the Division review it appears that the 3rd Quarter, 2022 Nitrate Monitoring Report for the Nitrate
Contamination Investigation, Energy Fuels Resources (USA) Inc. complies with the CAP and QAP.
Therefore, a letter will be drafted notifying EFR of the review and closing out of this Report.
Page 5
References
Energy Fuels Resources (USA) Inc., White Mesa Uranium Mill, Groundwater Discharge Permit No.
UGW370004, signed March 19, 2019.
Energy Fuels Resources (USA) Inc., June 5, 2019, White Mesa Uranium Mill, Ground Water
Monitoring Quality Assurance Plan (Revision 7.5).
Energy Fuels Resources (USA) Inc., White Mesa Uranium Mill 3rd Quarter, 2022 Nitrate Monitoring
Report, November 15, 2022.
HYDRO GEO CHEM, INC, May 7, 2012, Corrective Action Plan for Nitrate White Mesa Uranium Mill
near Blanding, Utah.
Table 1 of 16
Historic Nitrate, Nitrate+ Nitrite and Cloride Concentrations in Monitor Wells. Up to the 3rd Quarter 2022
Nitrate Contamination Investigation
White Mesa Uranium Mill
TWN-1 Parameter 'TWN-2 (Pumping well starting in
January 2013)
Sampling Event GWQS Sampling Event
Nitrate, Nitrate + Nitrite Chloride (mg/I)
(10 mg/L) NoGWQ5
lstQtr 3/17/2010 0.50 17 lstQtr 3/24/2010
2nd Qtr 5/26/2010 0.6 20 2nd Qtr 6/2/2010
3rd Qtr 9/27/2010 0.6 19 3rd Qtr 9/29/2010
4th Qtr 12/7/2010 0.6 14 4th Qtr 12/9/2010
1st Qtr 1/26/2011 0.5 17 1st Qtr 2/1/2011
2nd Qtr 4/20/2011 0.5 19 2nd Qtr 4/28/2011
3rdQtr 7/26/2011 0.5 14 3rd Qtr 7/28/2011
4th Qtr 10/17/2011 0.5 10 4th Qtr 10/20/2011
lstQtr 1/9/2012 0.6 15 1st Qtr 1/12/2012
2nd Qtr 4/18/2012 0.6 17 2nd Qtr _4L2EI~og ------------------~------------3rd Qtr 7/24/2012 0.6 17 3rd Qtr 7/31/2012
4th Qtr 10/17/2012 0.43 17.5 4thQtr 7/17/2012 ----------------------..., _______ ------2/19/2013 lstQtr 2/18/2013 0.68 17.6 1st Qtr
2nd Qtr 4/23/2013 0.84 17.4 2nd Qtr 4/24/2013
3rd Qtr 8/27/2013 1.24 24.1 3rd Qtr 8/27/2013
4thQtr 10/16/2013 1.61 26.8 4th Qtr 7/16/2013
TWN-65 duplicat ofTWN-1 1.48 27.1 DRC split of TWN-2
DRC split ofTWN-1 1.6 30
DRC duplicate of TWN-1 0.22 30
lstQtr
I
1/14/2014 1.47 29.2 1st Qtr 1/13/2014
2nd Qtr 5/6/2014 1.63 31.1 2nd Qtr 5/7/2014
3rd Qtr 8/5/2014 1.7 28 3rd Qtr 8/6/2014
TWN-65 duplicate of TWN-1 1.4 28
4th Qtr I 10/8/2014 1.46 27.6 4th Qtr 10/8/2014
lstQtr I 2/18/2015 1.37 27.8 lstQtr 2/18/2015
TWN-65 dup ofTWN-1 1.41 29.0
2nd Qtr 5/13/2015 0.65 29.2 2nd Qtr 5/12/2015
3rd Qtr 8/25/2015 0.624 33.2 3rdQtr 8/25/2015
4thQtr 10/13/2015 1.35 27.7 4th Qtr 10/14/2015
lstQtr 2/23/2016 1.51 30.3 lstQtr 2/23/2016
2nd Qtr 5/17/2016 1.73 32.1 2nd Qtr 5/17/2016
3rd Qtr 7/20/2016 1.76 29.6 3rd Qtr 7/20/2016
4th Qtr 10/6/2016 1.98 33 4th Qtr 10/11/2016
1st Qtr 2/15/2017 2.06 31.2 1st Qtr 2/15/2017
TWN-65 duplicate ofTWN-1 1.98 31.S
2nd Qtr I 6/1/2017 1.89 32.7 2nd Qtr I 6/1/20171
TWN-65 duplicate ofTWN-1 1.88 31.5
3rd Qtr I 7/19/2017 2.07 31.2 3rd Qtr I 7/19/20171
TWN-65 duplicate ofTWN-1 1.89 31.4
4th Qtr I 10/4/2017 1.95 30.8 4th Qtr I 10/4/20171
TWN-65 duplicate ofTWN-1 1.99 32.0
lstQtr 1/18/2018 1.86 30.4 lstQtr 1/19/2018
2nd Qtr 5/8/2018 1.89 28.4 2nd Qtr 5/9/2018
3rd Qtr 8/8/2018 1.97 34.2 3rd Qtr 8/8/2018
4th Qtr 11/20/2018 1.98 28.9 4th Qtr 11/20/2018
lstQtr 2/20/2019 2.1 31.4 lstQtr 2/20/2019
2nd Qtr 5/29/2019 1.93 32.6 2nd Qtr 5/29/2019
3rd Qtr 8/14/2019 215 30.3 3rd Qtr 8/14/2019
4th Qtr 10/16/2019 2.35 32.0 4th Qtr 10/16/2019
OWMRC split ofTWN-1 2.1 31.0 DWMRC split ofTWN-2
lstQtr 1/29/2020 2.24 33.8 lstQtr 1/29/2020
2nd Qtr 5/20/2020 2.24 33.0 2nd Qtr 5/20/2020
3rdQtr 7/15/2020 2.36 30.8 3rd Qtr 7/15/2020
4th Qtr 11/12/2020 1.89 29.2 4th Qtr 11/12/2020
lstQtr 2/17/2021 2.53 34.1 lstQtr 2/18/2021
2nd Qtr 5/25/2021 3.18 34.7 2nd Qtr 5/25/2021
3rd Qtr 8/18/2021 2.47 35.7 3rd Qtr 8/18/2021
4th Qtr 11/23/2021 1.91 37.4 4th Qtr 11/23/2021
lstQtr 2/15/2022 3.01 35.6 lstQtr 2/lfi/2022
2nd Qtr 5/24/2022 2.1 33.7 2nd Qtr 5/24/2022
3rd Qtr 8/17/2022 2.94 36.7 3rd Qtr 8/17/2022
Shaded = Nitrate, Nitrate+ Nitrite concentrations greater than the Ground Water Quality Standard of 10 mg/I
ORC = Utah Division or Radiation Control.
OWMRC = Utah Division of Waste Management and Radiation Control
Nitrate Pumping System Started in January 2013
As of March 2012 both north and south wild life ponds no longer receiving water.
Parameter
GWQS
Nitrate, Nitrate + Nitrite
(10 mg/L)
62
69
69
48
43
40
33
33
31
48 __________ .:;.
54 __________ n~
57.3
57.7
80.0
111
200
42.6
44.7
42
71
48.6
52.8
49.7
45
86.3
45.4
35.3
32.6
27.4
25 ol
23 91
31.91
19.6
19.8
18.6
19.6
19.0
45.1
23.2
18.2
16.0
16.5
16.l
17.2
12
15.4
13.8
15.3
12.7
15.3
14.0
13.9
Chloride (mg/I)
NoGWQ5
85
97
104
93
93
85
74
76
86
103 ------9,
79 -------80.5
82.1
75.9
70.4
75
72.4
84.9
80
81
87.8
83.6
87.8
74.9
73.9
74.5
68.8
69.8
65.8
61.5
64.2
60.5
57.1
62.3
61.5
56
50.7
102
50.7
53
52
66.1
59.6
55.6
53.5
61.8
61.5
58.9
62.3
59.5
60.2
61.8
Table 2 of 16
Historic Nitrate, Nitrate+ Nitrite and Cloride Concentrations in Monitor Wells Up to the 3rd Quarter 2022
Nitrate Contamination Investigation
White Mesa Uranium Mill
TWN-3 Parameter TWN-4
Sampling Event GWQS Sampling Event
Nitrate, Nitrate + Nitrite Chloride (mg/I)
(10 mg/L) NoGWQS
1st Qtr 3/25/2010 25.3 111 lstQtr 3/16/2010
2nd Qtr 6/3/2010 26 118 2nd Qtr 5/27/2010
3rd Qtr 7/16/2010 27 106 3rd Qtr 9/27/2010
4th Qtr 12/10/2010 24 117 4th Qtr 12/8/2010
lstQtr 2/1/2011 24 138 1st Qtr 1/25/2011
2nd Qtr 4/28/2011 26 128 2nd Qtr 4/20/2011
3rd Qtr 7/29/2011 25 134 3rd Qtr 7/26/2011
14th Qtr 10/20/2011 25 129 4th Qtr 10/18/2011
lstQtr 1/12/2012 25 143 1st Qtr 1/9/2012
2nd Qtr 4/20/2012 24 152 2nd Qtr _41...1y3..0}_2 ------------------------------------TWN-65 duplicate of TWN-4
3rd Qtr 7/31/2012 27 158 3rd Qtr I 7/25/2012
TWN-65 duplicate of TWN-4
14~.9~-10/17/2012 12.1 149 4th Qtr -t 7/15/2012 -ij19ji013 ------------""'"-------lstQtr 22.2 157 1st Qtr 2/18/2013
TWN-65 duplicate of TWN-4
2nd Qtr 4/24/2013 27.2 158 2nd Qtr
I
4/23/2013
3rdQtr 8/28/2013 20.9 171 3rd Qtr 8/27/2013
TWN-65 duplicate ofTWN-4
4th Qtr 10/17/2013 23.5 163 4thQtr I 7/16/2013
TWN-65 duplicate of TWN-4
1st Qtr 1/15/2014 19.6 160 1st Qtr j 1/14/2014
TWN-65 duplicate ofTWN-4
2nd Qtr 5/7/2014 23.6 168 2nd Qtr I 5/612014
TWN-65 duplicate ofTWN-4
3rd Qtr 8/6/2014 19.5 174 3rd Qtr 8/5/2014
4th Qtr 10/9/2014 19.1 153 4th Qtr 10/8/2014
lstQtr 2/19/2015 19.4 164 1st Qtr 2/18/2015
2nd Qtr 5/14/2015 17.2 141 2nd Qtr 5/13/2015
3rd Qtr 8/26/2015 16.2 156 3rd Qtr 8/25/2015
TWN-65 duplicate of TWN-4
4thQtr 10/14/2015 16.3 129 4th Qtr [ 10/13/2015
TWN-65 duplicate of TWN-4 ----------------------lstQtr 2/24/2016 16.8 128 lstQtr 2/23/2016
2nd Qtr 5/18/2016 13.5 116 2nd Qtr 5/17/2016
3rd Qtr 7/20/2016 16.8 110 3rd Qtr 7/20/2016
4th Qtr 10/7/2016 15.8 113 4th Qtr 10/6/2016
1st Qtr 2/16/2017 17.4 113 lst Qtr 2/15/2017
2nd Qtr 6/2/2017 15.9 108 2nd Qtr 6/1/2017
3rd Qtr 7/20/2017 15.9 106 3rd Qtr 7/19/2017
14th Qtr 10/4/2017 15.6 111 4th Qtr 10/4/2017
lstQtr 1/19/2018 14.4 107 lstQtr 1/18/2018
2nd Qtr 5/9/2018 16.4 115 2nd Qtr 5/9/2018
3rd Qtr 8/9/2018 19.4 149 3rd Qtr 8/8/2018
TWN-65 duplicate ofTWN-4
14th Qtr 1112112018 I 201[ 123 4th Qtr I 1112012018
TWN-65 duplicate ofTWN-4
lstQtr 2/21/2019 20.7 140 lstQtr 2/20/2019
2nd Qtr 5/30/2019 18.7 137 2nd Qtr 5/29/2019
3rdQtr 8/15/2019 19.8 133 3rd Qtr 8/14/2019
14th Qtr 10/17/2019 19.6 126 4th Qtr 10/16/2019
IOWMRC split ofTWN-3 17.0 130 TWN-65 duplicate ofTWN-4
DWMRC split ofTWN-4
TW4-40 DWMRC duplicate of TWN
4
lstQtr I 1/30/202~1 19~1 156 lstQtr
I
1/29/2020
2nd Qtr 5/21/2020 24 136 2nd Qtr 5/20/2020
TWN-65 duplicate of TWN-4
3rd Qtr I 7/15/2020[ 22.2[ 130 3rd Qtr I 7/15/2020
TWN-65 duplicate ofTWN-4
14th Qtr 11/13/2020 18 137 4thQtr 11/12/2020
lstQtr 2/18/2021 23.8 145 lstQtr 2/17/2021
2nd Qtr 5/27/2021 25 156 2nd Qtr 5/25/2021
3rd Qtr 8/19/2021 24.3 146 3rd Qtr 8/18/2021
14th Qtr 11/24/2021 17.4 147 4th Qtr 11/23/2021
TWN-65 duplicate of TWN-4
1st Qtr 2/16/2022 25.3 140 1st Qtr 2/16/2021
2nd Qtr 5/25/2022 24 157 2nd Qtr 5/25/2022
3rd Qtr 8/18/2022 28.2 163 3rd Qtr 8/18/2022
Shaded= Nitrate, Nitrate+ Nitrite concen~rat1ons greater than the Ground Water Quality Standard of 10 mg/I
Nitrate Pumping System Started in January 2013
As of March 2012 both north and south wild life ponds nO longer receiving water.
Parameter
GWQS
Nitrate, Nitrate + Nitrite
(10 mg/L)
0.9
1.0
0.9
1.0
0.9
0.9
1.1
0.9
0.9
1.1 -----------1.1
1.4
1.5 __________ J.A~
1.5
1.5
1.63
1.6
1.57
1.69
0.22
1.41
1.33
1.55
1.54
2.0
1.44
1.48
0.733
0.974
1.160
1.58
1.45 --------2.02
2.97
3.14
3.09
2.63
2.4
2.35
2.27
2.63
1.9
1.54
1.51
1.48
1.51
1.53
1.5
1.81
2.15
2.15
1.9
1.9
1.89
1.75
1.71
1.75
1.73
1.18
1.64
1.70
1.28
1.18
1.02
1.5
1.20
1.39
Chloride (mg/I)
NoGWQS
22
22
19
21
21
21
35
20
20
24 -------24
25
26
______ 2~~
25.3
25.9
24.4
27.2
29.0
29.4
32
28.4
26.4
29.6
26.6
28
30.7
31.5
31.9
35.2
35.2
28.4
25.6 ------30.7
31.7
28.0 --~
31.3
31.2
28.6
28.0
27.4
31.2
27.7
28
27.6
22.7
23.2
25.3
26.5
23.7
25.4
24.7
26.0
26.0
27.2
25.1
25.4
23.1
23.1
22.8
24.2
23.2
23.7
23.2
23.2
22.7
20.9
21.6
Table 3of16
Historic Nitrate, Nitrate+ Nitrite and Cloride Concentrations in Monitor Wells Up to the 3rd Quarter 2022
Nitrate Contamination Investigation
White Mesa Uranium Mill
TWN-5
Sampling Event
Parameter
GWQS
TWN-6
Sampling Event
Nitrate, Nitrate+ Nitrite
(10 mg/L)
Chloride (mg/I)
NoGWQS
1st Qtr 3/16/201 ..... 43 1st Qtr i~d Qt; ... si2G/ioio 0.3 44 2nd Qtr
3rd Qtr 7/12/2010 0.3 43 3rd Qtr
104_th~Qt~r---~---+---------+-_____ 4_,5 4th Qtr
~~ .~~~
2nd (l,tr 4/20/2011 0.3 44 2nd Qtr
3rd Qtr 7/26/2011 0.3 44. 3rd Qtr
104_th~Qt~r--~~---+---------+------4-1S 4th Qtr
1st O,tr
2nd Qtr 18/2012 0.3
3rd Qtr 7 /24/201
4th Qtr 10/15/201
1st Qtr 201
2nd Qtr 2013 NA
TWN-5 abandoned on July 31, 2013
NA= Per the CAP and SCO, not sampled
.3rd O,tr 2013
4th Qtr 2013
lstQtr 2014
2nd Qtr 2014
3rd Qtr 2014
4th Qtr 2014
1st Qtr 2015 ..
2nd Qtr 2015
3rd Qtr 2015
4th Qtr 2015
1st O,tr .2016.
2nd Qtr 2016.
3rd O,tr 2016
4th Qtr 2016
1st Qtr 2017
2n.d Qtr 2017
3r.d Qtr 2017
4th Qtr 2017
1st O,tr2018
2nd Qtr 2018
3rd Qtr 2018
4th Qtr 2018
1st O,tr 2019.
2nd Qtr2019
3rd Qtr 2019
4th Qtr 2019
1st O,tr 2020.
2nd O,tr 2020
3rd Qtr 2020
4th Qtr 2020
1st Qtr 2.021 ...
2nd Qtr 2021
3rd Qtr2021
4th Qtr 2020
ls.t. O,tr 2022
2nd Qtr 2022
3rd Qtr 2022
3/23/2010
6/1/2010
7/13/2010
12/7/2010
1/26/2011
4/20/2011
7/27/2011
10/18/2011
1/10/2012
4/18/2012
7/25/2012
7/15/2012
Parameter
GWQS
Nitrate, Nitrate + Nitrite
(10 mg/L)
NA
NA
NA
NA
NA
NA
NA
NA
NA
NA
NA
NA
1.5
1.1
1.1
Chloride (mg/I)
NoGWQS
19
22
73
21
18
22
17
21
20
22
22
TWN-7
Table 4 of 16
Historic Nitrate, Nitrate + Nitrite and Cloride Concentrations in Monitor Wells Up to the 3rd Quarter 2022
Nitrate Contamination Investigation
White Mesa Uranium Mill
Parameter TWN-8 Parameter
Sampling Event GWQS Sampling Event GWQS
Nitrate, Nitrate + Nitrit~ Chloride (mg/I) Nitrate, Nitrate + Nitrite
(10 mg/L) NoGWQ5 (10 mg/L)
lstQtr 3/17/2010 0.8 6 1st Qtr 3/16/2010 <0.1
2nd Qtr 5/28/2010 1.2 6 2nd.Qtr 5/26/2010 <0.1
3rd Qtr 7/14/2010 1.8 7 3rd Qtr 7/12/2010 <0.1
4thQtr 12/10/2010 1 4 4th Qtr 12/7/2010 <0.1
lstQtr 1/27/2011 1.3 6 1st Qtr 1/25/2011 <0.1
2nd Qtr 4/21/2011 1.7 6 2nd Qtr 4/19/2011 <0.1
3rd Qtr 7/29/2011 0.7 5 3rd Qtr 7/26/2011 <0.1
4th Qtr 10/19/2011 2.2 6 4th Qtr 10/17/2011 <0.1
lstQtr 1/11/2012 2.3 5 1st Qtr 1/9/2012 <0.1
2nd Qtr 4/20/2012 1.2 6 ~n.i9_ti:.._ 4/18/2012 <0.1 -------------------.,_ _______
-7/24/2012 -----------3rd Qtr 7/26/2012 0.9 6 3rd Qtr <0.1
Chloride (mg/I)
NoGWQ5
11
11
11
9
13
10
18
10
11
15 -------11
4th Qtr 10/16/2012 0.64 5.67 !t!!.~'--1:..°L1J32!.2 <0.1 11.1 ------------------.,_ _______
lstQtr 2/19/2013 0.59 5.68 lstQtr
2nd Qtr 4/24/2013 1.16 5.88 2nd Qtr I
3rd Qtr 8/28/2013 0.835 6.96
4th Qtr 10/16/2013 0.986 5.7
lstQtr 1/15/2014 0.882 5.75
2nd Qtr 5/7/2014 0.564 5.26
3rd Qtr 8/6/2014 0.9 6
4thQtr 10/9/2014 0.968 5.93
1st Qtr 2/19/2015 1.04 5.58
2nd Qtr 5/14/2015 0.779 6.18
3rd Qtr 8/6/2015 0.348 6.12
4th Qtr _____ 10/14/2015 0.672 5.84
2/24/20i6 --------------------------------------1st Qtr 0.24 6.06
2nd Qtr 5/18/2016 0.732 6.26
3rd Qtr 7/21/2016 0.81 5.97
4th Qtr 10/7/2016 0.698 6.17
1st Qtr 2/16/2017 1.63 14.0
2nd Qtr 6/2/2017 3.74 29.7
3rd Qtr 7/20/2017 2.7 29.0
4th Qtr 10/5/2017 3.58 41.4
1st Qtr 1/19/2018 5.82 69.4
2nd Qtr 5/9/2018 10.2 94.7
3rd Qtr 8/9/2018 10.6 105
4th Qtr 11/21/2018 11.5 104
1st Qtr 2/21/2019 12.9 107
2nd Qtr 5/30/2019 13.5 122
3rd Qtr 8/15/2019 12.9 120
4th Qtr 10/17/2019 14.5 119
DWMRC split ofTWN-7 12.0 120
1st Qtr 1/30/2020 14.2 128
2nd Qtr 5/21/2020 14.6 126
3rd Qtr 7/16/2020 15.2 116
4th Qtr 11/13/2020 11.8 121
1st Qtr 2/18/2021 16.0 129
2nd Qtr 5/27/2021 16.4 129
3rd Qtr 8/19/2021 15.1 121
4thQtr 11/24/2020 7.66 130
lstQtr 2/17/2022 16.9 120
2nd Qtr 5/25/2022 16.0 127
3rd Qtr 8/18/2022 14.6 128
Shaded = Nitrate, Nitrate+ Nitrite concentrations greater than the Ground Water Quality Standard of 10 mg/I
NA = Per the CAP and SCO, not sampled
Nitrate Pumping System Started in January 2013
As of March 2012 both north and south wild life ponds no longer receiving water.
------------------2013 NA
2013 NA
TWN-8 abandoned on July 31, 2013
Table 5 of 16
Historic Nitrate, Nitrate+ Nitrite and Cloride Concentrations in Monitor Wells Up to the 3rd Quarter 2022
Nitrate Contamination Investigation
White Mesa Uranium Mill
TWN-9 Parameter TWN-10 Parameter
Sampling Event GWQS Sampling Event GWQS
Nitrate, Nitrate + Nitrite Chloride (mg/I) Nitrate, Nitrate+ Nitrite
(10 mg/L) NoGWQS (10 mg/L)
lstQtr 3/23/2010 7.6 183 1st Qtr 3/23/2010 1.5
2nd Qtr 6/1/2010 7.7 175 2nd Qtr 6/2/2010 1.0
3rd Qtr 7/15/2010 10.7 210 3rd Qtr 7/14/2010 0.2
4th Qtr 12/9/2010 8.0 ·172 4th Qtr 12/8/2010 1.3
lstQtr 2/1/2011 9.5 217 1st Qtr 1/26/2011 0.3
2nd Qtr 4/28/2011 10.0 192 2nd Qtr 4/21/2011 1.2
3rd Qtr 7/29/2011 11.0 208 3rd Qtr 7/27/2011 0.1
4thQtr 10/20/2011 10.9 134 4th Qtr 10/18/2011 0.2
lstQtr 1/12/2012 12.2 202 lstQtr 1/10/2012 0.8
TW4-65 dup ofTWN-10 0.7
2nd Qtr 4/20/2012 10.6 209 2nd Qtr I 4/19/2012 0.9
3rd Qtr 7/31/2012 12.3 215 3rd Qtr 7/25/2012 0.6
4th Qtr 10/17/2012 12.S 194 4th Qtr 7/16/2012 0.12
1st Qtr 2013 NA 1st Qtr 2013 NA
2nd Qtr 2013 NA 2nd Qtr 2013 NA
TWN-9 abandoned on July 31, 2013 TWN-10 abandoned on July 31, 2013
TWN-11 Parameter TWN-12 Parameter
Sampling Event GWQS Sampling Event GWQS
Nitrate, Nitrate+ Nitrite Chloride (mg/I) Nitrate, Nitrate+ Nitrite
(10 mg/L) NoGWQS (10 mg/L)
lstQtr 3/17/2010 1.4 73 1st Qtr 3/17/2010 0.7
2nd Qtr I 6/1/2010 1.3 72 2nd Qtr 5/26/2010 0.8
3rd Qtr 9/27/2010 1.4 76 3rd Qtr 7/12/2010 0.7
4thQtr 12/8/2010 1.4 72 4th Qtr 12/7/2010 0.7
1st Qtr 1/27/2011 1.4 84 lstQtr 1/26/2011 4.2
2nd Qtr I 4/26/2011 1.4 76 2nd Qtr 4/26/2011 1.0
3rd Qtr 7/27/2011 0.1 76 3rd Qtr 7/26/2011 0.6
4th Qtr 10/17/2011 1.6 76 4th Qtr 10/17/2011 1.2
1st Qtr 1/10/2012 I.6 69 1st Qtr 1/10/2012 0.9
ate ofTWN-11 1.6 70
2nd Qtr
I
4/19/2012 1.6 71 2nd Qtr 4/18/2012 1.2
3rdQtr 7/25/2012 1.8 77 3rd Qtr 7/25/2012 1.4
4th Qtr 10/16/2012 1.84 76.4 4th Qtr 7/16/2012 1.41
1st Qtr 2013 NA 1st Qtr 2013 NA
2nd Qtr 2013 NA 2nd Qtr 2013 NA
TWN-11 abandoned on July 31, 2013 TWN-12 abandoned on July 31, 2013
Shaded = Nitrate, Nitrate+ Nitrite concentrations greater than the Ground Water Quality Standard of 10 mg/I
NA= Per the CAP and SCO, not sampled
Shaded = Nitrate, Nitrate+ Nitrite concentrations greater than the Ground Water Quality Standard of 10 mg/I
Chloride (mg/I)
NoGWQS
54
30
21
28
40
28
28
33
44
28
33
30.8
Chloride (mg/I)
NoGWQS
113
106
112
103
87
109
102
87
104
106
102
101
Table6 of 16
Historic Nitrate, Nitrate+ Nitrite and Cloride Concentrations in Monitor Wells Up to the 3rd Quarter 2022
Nitrate Contamination Investigation
Sampling Event
Parameter
GWQS
Nitrate, Nitrate + Nitrite
(10 mg/L)
1st O,tr ..... 3/1.7/2010 <0,1
2nd Qtr S/26/2010
3rd O,tr 9/27/2010
11_4_th_Q~t_r_+-_1..,2/.?./2010
1st O,tr .. 1/25/2011 ..
2nd Qtr 4/26/201.1. 50,1
3rd Qtr 7/26/2011
4th Qtr 10/17/2011 <0.1
1st Qtr ..... 1/9/2012 <0,1
2ndQtr. . ... 4/18/2012 <0.1
3rd Qtr 7/.24/2012 .
NA= Per the CAP and SCO, not sampled
White Mesa Uranium Mill
Chloride (mg/I)
NoGWQS
TWN-14
Sampling Event
Parameter
GWQS
1st Qtr
2nd Qtr
3rdQtr.
4th Qtr
.lstQtr
2nd Qtr
3rd O,tr ..
4th Qtr
1st Qtr
2nd Qtr
3rdQtr
4th Qtr
1st Qtr
2nd Qtr
3rd O,tr ..
4th Qtr
1st Qtr
2n.d O,tr
3rdQtr.
4th Qtr
1st Qtr
2nd Qtr
.3r.dO,tr
4th Qtr
1st Qtr
2nd Qtr
3rc!Qtr
Nitrate, Nitrate + Nitrite
(10 mg/L)
Chloride (mg/I)
NoGWQS
24
6/2/2010 2.9 30
7/15/2010 3.5 26
/10~-----------+------2-<81 /28 24
4/27/2011 3.5 30
7/29/2011 3.5 25
27
26
/2012 3.4 27
/2012 3.7 27
14 3.8 27
2020 NA
TWN-15
Sampling Event
Table 7 of 16
Historic Nitrate, Nitrate+ Nitrite and Cloride Concentrations in Monitor Wells Up to the 3rd Quarter 2022
Nitrate Contamination Investigation
Parameter
GWQS
Nitrate, Nitrate + Nitrite
(10 mg/L)
White Mesa Uranium Mill
Chloride (mg/I)
NoGWQS
TWN-16
Sampling Event
Parameter
GWQS
Nitrate, Nitrate+ Nitrite
(10 mg/L)
Chloride (mg/I)
NoGWQS
lstQtr 3/18/2010 0. 7 4} 1st Qtr 3/17/2010 .. 1.2 35
2nd(ltr jfi~(?Ofo 1.0 3~ 2nd Qtr 5/27/2010 . 1.3 35
3rd Qtr 7 13/2010 1.0 36 3rd Qtr 9/27/2010 2.6 35
4th Qtr ==::+--------=-:.=.+------'3"'8'1'4:_:.th:.:..::,Qtc:_r_-+.-:c,:12(~/-'-2-'-'+---------=+-------'3CCCIOI
1st Qtr. . .4.3 .. ls.t. qtr .. 1/27/2 .. 34
2nd Qtr 49 2nd Qtr 4/27 /2 39
3rd Qtr 27 2 31
lf'4:.:th:.:..::,U,::tr_+-====1---------=:+------""Cf2.:C.:.::"'--+= lS=c..c.i--------=+------'-3-'441 ~~ 10 n
2nd Qtr 19 50
TW4-70 duplicate of TWN-15 :Irnt I i6~ij)iciii
1st Qtr
2nd Qtr
1.7
2.1
1.79
TWN-15 abandoned on July 31, 2013
NA= Per the CAP and SCO, not sampled
1st Qtr
2nd Qtr
.3rd(ltr ..
4th Qtr
1st Qtr
2nd Qtr
3rdQtr.
4th Qtr
1st Qtr
2nd Qtr
3rdqtr ..
4th Qtr
1st Qtr
2nd Qtr
3rdQtr.
4th Qtr
lstqtr
2nd Qtr
3rd Qfr
4th Qtr
1st Qtr
2nd Qtr
3rdqtr
4th Qtr
1st Qtr
2ndQtr
3rd Qtr
4th Qtr
1st Qtr
2nd Qtr
3rdqtr
4th Qtr
1st Qtr
2nd Qtr
3rd o.tr··
2015 NA
33
32.1
Table 8 of 16
Historic Nitrate, Nitrate+ Nitrite and Cloride Concentrations in Monitor Wells Up to the 3rd Quarter 2022
Nitrate Contamination Investigation
White Mesa Uranium Mill
TWN-17 Parameter TWN-18
Sampling Event GWQS Sampling Event
Nitrate, Nitrate+ Nitrite Chloride (mg/I)
(10 mg/L) NoGWQS
lstQtr 3/24/2010 10.4 78 lstQtr 3/17/2010
2nd Qtr 6/3/2010 11 87 2nd Qtr 6/1/2010
3rd Qtr 7/15/2010 8.9 66 3rd Qtr 9/27/2010
4thQtr 12/10/2010 8 65 4th Qtr 12/9/2010
lstQtr 2/1/2011 8.6 90 1st Qtr 1/27/2011
2nd Qtr 4/28/2011 9 81 2nd Qtr 4/26/2011
3rd Qtr 7/29/2011 8,5 74 3rd Qtr 7/28/2011
4th Qtr 10/20/2011 8,1 71 4th Qtr 10/18/2011
1st Qtr 1/12/2012 8.7 79 1st Qtr 1/10/2012
2nd Qtr 4/20/2012 9.1 _______ 8.£ ~n!!~t!:,_ _ _ 4L1~'!..o!:..2
l;;iQtr -------------------7/27/2012 9.5 85 3rd Qtr 7/26/2012
1~.9~-10/17/2012 9.65 84.8 4th Qtr 7/16/2012 -------------------------------2/18/2013 lstQtr 2013 NA lstQtr
2nd Qtr 2013 NA 2nd Qtr 4/23/2013
TW4-65 dup of TWN-18
3rd Qtr 2013 NA 3rd Qtr
I
8/27/2013
TWN-17 abandoned on July 31, 2013 4th Qtr 10/16/2013
DRC split sample
lstQtr 2/14/2014
2nd Qtr 5/6/2014
3rd Qtr 8/5/2014
4thQtr 10/8/2014
TW4-65 dup of TWN-18
lstQtr I 2/18/2015
2nd Qtr 5/13/2015
TW4-65 dup of TWN-18
3rd Qtr I 8/25/2015
4th Qtr 10/13/2015
TW4-65 dup of TWN-18
lstQtr 2/23/2016
2nd Qtr 5/17/2016
3rd Qtr 7/21/2016
4thQtr 10/6/2016
lstQtr 2/15/2017
2nd Qtr 6/1/2017
3rd Qtr 7/19/2017
4th Qtr 10/4/2017
lstQtr 1/18/2018
2nd Qtr 5/8/2018
3rd Qtr 8/8/2018
4thQtr 11/21/2018
lstQtr 2/20/2019
TWN-65 dup ofTWN-18
2nd Qtr I 5/29/2019
TWN-65 dup ofTWN-18
3rd Qtr I 8/14/2019
TWN-65 dup ofTWN-18
4th Qtr I 1011612019
DWMRC duplicate ofTWN-18
lstQtr I 1/29/2020
TWN-65 dup ofTWN-18
2nd Qtr I 5/20/2020
3rdQtr 7/15/2020
4th Qtr 11/12/2020
TWN-65 dup of TWN-18
1st Qtr I 2/17/2021
TWN-65 dup ofTWN-18
2nd Qtr I 5/25/2021
TWN-65 dup of TWN-18
3rd Qtr I 8/17/2021
TWN-65 dup ofTWN-18
4thQtr I 1112312021
1st Qtr I 2/15/2022
TWN-65 dup of TWN-18
2nd Qtr I 5/24/2022
TWN-65 dup of TWN-18
3rd Qtr I 8/17/2022
TWN-65 dup ofTWN-18
NA= Per the CAP and SCO, not sampled
Shaded= Nitrate, Nitrate+ Nitrite concentrations greater than the Ground Water Quality Standard of 10 mg/I
DRC = Utah Division of Radiation Control
Nitrate Pumping System Started In January 2013 ______ ,
As of March 2012 both north and south wild life ponds no longer receiving water. __
Parameter
GWQS
Nitrate, Nitrate + Nitrite
(10 mg/L)
1.6
1.8
1.8
1.6
1.4
1.8
1.8
1.9
1.9
2.1 ------------2.3
1.95 ------------2.27
2.32
2.46
2.04
2.15
0.29
2.33
2.18
1.8
1.47
1.47
1
1.35
<0.10
0.35
0.668
0.645
0.648
0.497
<0.100
0.501
0.47
0,392
0.419
0.256
0.332
0.283
0.348
0.16
0.155
0.174
0.129
0.152
0.181
0.184
0.162
0.13
0.224
0.249
0.223
0.232
0.208
0.171
0.228
0.227
0.22
0.247
0.199
0.208
0.245
0.199
<0.1
0,34
0.3
0.328
0.349
Chloride (mg/I)
NoGWQS
42
63
64
59
61
67
65
60
64
64 ------6 7
67.5 ------68.7
64.3
66.1
70.4
67.3
74
68.4
76.5
70
74.8
72.3
73.3
76.6
76.9
81.3
69
68.6
67.6
69.9
____gJ_
67.4
62.1
63.9
59.0
56.6
53.1
57.8
59.7
48.1
46.4
49.9
so.a
~3.3
46.9
47.3
47.1
43,0
51.9
50.6
47.4
44.0
42.3
41.9
46.2
46.1
44.9
44.1
42.9
44.1
46.'
40.'
40.'
40.
39.
40.
40.7
Table 9 of 16
Historic Nitrate, Nitrate+ Nitrite and Cloride Concentrations in Monitor Wells Up to the 3rd Quarter 2022
Nitrate Contamination Investigation
TWN-19
Sampling Event
Parameter
GWQS
White Mesa Uranium Mill
Upper Wildlife Pond
Sampling Event
Parameter
GWQS
Nitrate, Nitrate + Nitrite
(10 mg/L)
Chloride (mg/I)
NoGWQS
Nitrate, Nitrate+ Nitrite
(10 mg/L)
1st. Cltr .. 3/23/2 3/lS/2010 .<.0 ... 1
2nd Qtr 6/1/i · 6/2/2010 .<0.1.
3rd Cltr 7/19/2010 <0.1
lf-'4..:.:th.:...Q::,;tc.r_+--=c'-=':=..:=!---------'-'-:+------==-iF:..::,:::.._-f-1=2/10/2010 <0.1
1st Qtr 1/31/2011
2nd Qtr 4/25/2011 <0,1
3rdQtr 7/25/2011 <0 .. 1
4th Qtr 10/19/2011 <0.1
~~ m~u
2nd Qtr Pond no longer in service
3rdQtr
4th Qtr
lstQtr
2nd Qtr
3r.d(ltr
4th Qtr
ls.t. Qtr ..
2nd Qtr
3rdQtr
4th Qtr
1st Cl.tr
2ndQtr
3rdQtr
4th Qtr
1st. (ltr
2nd Qtr
3rdQtr
4th Qtr
1st Qtr
2.nd Qtr
3r_d (ltr
4th Qtr
1st (ltr ..
2nd Qtr
3rd (ltr
4th Qtr
1st Qtr
2nd Qtr
3rdQtr
4thQtr
1st (ltr .
2nd (ltr
3rdQtr .
4th Qtr
1st Qtr
2nd (ltr
3rd (ltr .
4th Qtr
lstQtr
2nd Qtr
3rd Qtr
TWN-20
Sampling Event
3rdQtr
4th Qtr
lstQtr
2nd Qtr
3rd Qtr
2014 NA
2014 NA
Parameter
GWQS
Nitrate, Nitrate+ Nitrite
(10 mg/L)
NA= Per the CAP and SCO, not sampled
Chloride (mg/I)
NoGWQS
TWN-21
Sampling Event
Parameter
GWQS
Nitrate, Nitrate+ Nitrite
(10 mg/L)
Chloride (mg/I)
NoGWQS
<1.0
<1.0
Chloride (mg/I)
NoGWQS
Table 10 of 16
Historic Nitrate, Nitrate+ Nitrite and Cloride Concentrations in Monitor Wells Up to the 3rd Quarter 2022
Nitrate Contamination Investigation
White Mesa Uranium Mill
Pizometer 1 Parameter Pizometer 2 Parameter
Sampling Event GWQS Sampling Event GWQS
Nitrate, Nitrate+ Nitrite Chloride (mg/I) Nitrate, Nitrate + Nitrite
(10 mg/L) NoGWQ5 (10 mg/L)
2nd Qtr 6/2/2010 7.2 52 2nd Qtr 6/2/2010 0.6
3rd Qtr 7/19/2010 6.8 52 3rd Qtr 7/19/2010 0.6
4th Qtr 12/10/2010 6.5 60 4th Qtr 12/10/2010 0.2
l stQtr 1/31/2011 7 60 1st Qtr 1/31/2011 0.3
2nd Qtr 4/25/2011 6.8 58 2nd Qtr 4/25/2011 0.3
3rd Qtr 7/25/2011 7 53 3rd Qtr 7/25/2011 0.1
4th Qtr 10/19/2011 6.6 55 4th Qtr 10/19/2011 0.1
lstQtr 1/11/2012 7.1 78 1st Qtr 1/11/2012 0.1
lstQtr 1/10/2012 7.0 114 1st Qtr 1/31/2012 0.1
2nd Qtr 4/20/2012 . 6.6 _______ 5!!_ 2nd Qtr _4L29f~:...2 0.2 -----------------------------------3rd Qtr 7/27/2012 7.2 56 3rd Qtr 7/27/2012 0.2
4th Qtr 10/17/2012 7.66 _______ 52, 4th Qtr 7/17/2012 0.19 ------------------------2/19/2013 ------------lstQtr 2/19/2013 8.11 56.7 1st Qtr 0.22
2nd Qtr 4/24/2013 8.88 53.3 2nd Qtr 4/24/2013 0.172
3rd Qtr 8/28/2013 7.83 55.1 3rd Qtr 8/28/2013 0.198
4th Qtr 10/16/2013 6.68 54.1 4th Qtr 10/16/2013 0.36
DRC split of Piez-1 1.3 60 DRC split of Piez-2 0.27
lstQtr 1/13/2014 6.79 56.2 lstQtr 1/13/2014 0.169
2nd Qtr 5/7/2014 7.57 52.1 2nd Qtr 5/7/2014 0.736
3rd Qtr 8/6/2014 5.1 55 3rd Qtr 8/6/2014 0.8
4thQtr 10/8/2014 5.75 57.6 4th Qtr 10/8/2014 0.755
lstQtr 2/18/2015 6.41 55.9 lstQtr 2/18/2015 0.749
2nd Qtr 5/12/2015 5.95 57.5 2nd Qtr 5/12/2015 0.646
3rd Qtr 8/26/2015 4.96 64.2 3rd Qtr 8/6/2015 0.7
10/14/2015 6.17 54.4 10/14/2015 0.692
Chloride (mg/I)
NoGWQ5
8
8
6
9
8
9
8
9
1
8 -------9
9.5 -------9.67
10.3
9.66
9.22
11
11.4
11.4
12
12.2
12.5
13.1
15.5
13.3 ~!-~_g\r ------------------------------------4th Qt!_ ______ -------
1st Qtr 2/23/20i6 8.31 56.5 lstQtr 2/23/2016 0.615 13.4
2nd Qtr 5/12/2016 6.33 59.1 2nd Qtr 5/12/2016 0.665 14
3rd Qtr 7/19/2016 6.78 53.9 3rd Qtr 7/19/2016 0.669 12.4
4th Qtr 10/11/2016 6.42 58.1 4th Qtr 10/11/2016 0.732 13.4
1st Qtr 2/15/2017 6.75 54.5 lstQtr 2/15/2017 0.696 12.4
2nd Qtr 6/1/2017 6.6 54.7 2nd Qtr 6/1/2017 0.345 13.2
3rd Qtr 7/20/2017 6.8 58 3rd Qtr 7/20/2017 · 0.555 13.4
4th Qtr 10/4/2017 6.21 54.4 4th Qtr 10/4/2017 0.684 12.7
1st Qtr 1/17/2018 6.35 55.3 lstQtr 1/17/2018 0.716 13.0
2nd Qtr 5/9/2018 6.56 58 2nd Qtr 5/9/2018 0.776 14.0
3rd Qtr 8/8/2018 6.66 63.5 3rd Qtr 8/8/2018 0.818 15.1
4th Qtr 11/21/2018 6.7 55.5 4th Qtr 11/20/2018 0.648 12.3
lstQtr 2/19/2019 6.72 56.8 lstQtr 2/19/2019 0.599 12.9
2nd Qtr 5/30/2019 6.75 59.4 2nd Qtr 5/30/2019 0.702 12.6
3rd Qtr 8/14/2019 6.81 61.1 3rd Qtr 8/14/2019 0.606 13.2
4th Qtr 10/16/2019 7.21 59.3 4th Qtr 10/16/2019 0.573 12.6
DWMRC duplicate of P-1 6.4 60 DWMRC duplicate of P-2 0.36 21
lstQtr 1/30/2020 7.12 68.9 lstQtr 1/30/2020 0.740 14.2
2nd Qtr 5/20/2020 6.95 67.7 2nd Qtr 5/20/2020 0.679 14.4
3rd Qtr 7/15/2020 7.36 63.6 3rd Qtr 7/15/2020 0.793 12.7
4th Qtr 11/13/2020 7.51 63.9 4th Qtr 11/13/2020 0.544 12.9
lstQtr 2/18/2021 7.34 57.5 lstQtr 2/18/2021 0.401 15.7
2nd Qtr 5/27/2021 7.89 69.9 2nd Qtr 5/27/2021 <0.1 · 13.9
3rd Qtr 8/19/2021 7.6 70 3rd Qtr 8/19/2021 0.11 14.6
4th Qtr 11/23/2021 4.69 65.5 4th Qtr 11/23/2021 <0.1 14.8
lstQtr 2/16/2022 7.4 68.8 lstQtr 2/16/2022 0.330 14.0
2nd Qtr 5/24/2022 5.9 70.3 2nd Qtr 5/24/2022 0.48 12.6
3rd Qtr 8/17/2022 6.37 72 3rd Qtr 8/17/2022 0.71 14.7
DRC = Utah Division of Radiation Control
N°itrate Pumping System Started in January 2013 ______ .
As of March 2012 both north and south wild life ponds no longer receiving water. __
Table 11 of 16
Historic Nitrate, Nitrate + Nitrite and Cloride Concentrations in Monitor Wells Up to the 3rd Quarter 2022
Nitrate Contamination Investigation
White Mesa Uranium Mill
Pizometer 3 Parameter Pizometer 3A Parameter
Sampling Event GWQS Sampling Event GWQS
Nitrate, Nitrate + Nitrite Chloride (mg/I) Nitrate, Nitrate + Nitrite
(10 mg/L) NoGWQS (10 mg/L)
1st Qtr 3/24/2010 1.7 116
2nd Qtr 6/2/2010 1.6 36
3rd Qtr 7/19/2010 1.8 35
4th Qtr 12/9/2010 1.8 25
1st Qtr 1/31/2011 1.8 40
2nd Qtr 4/25/2011 1.7 35
3rd Qtr 7/25/2011 1.8 61
4th Qtr 10/19/2011 1.7 12
1st Qtr 1/11/2012 1.8 20
2nd Qtr 4/20/2012 1.7 53 ------------------~-------3rdQtr 7/27/2012 1.8 21
4th Qtr 10/17/2012 2.75 20.1 ------------------.,_ _______
lstQtr 2/24/2013 1.85 21
2nd Qtr 4/24/2013 1.83 21.2
3rd Qtr 8/28/2013 1.81 22.4
4th Qtr 10/16/2013 1.8 23.S
ORC split sample 0.33 27
lstQtr 1/13/2014 1.7 26
2nd Qtr 5/7/2014 1.79 23.9
3rd Qtr 8/6/2014 1.7 26
4thQtr 10/8/2014 1.74 28.3
1st Qtr 2/18/2015 1.82 27.3
2nd Qtr 5/12/2015 1.75 30.2
3rd Qtr 8/26/2015 1.87 54.8
Chloride (mg/I)
NoGWQS
~!-~_g\r 10/14/2015 2.24 39.5 New piezometer P-3A to replace piezometer P-3 drilled and installed in ---------------------------------------1st Qtr 2/23/2016 1.82 27.3
Pizometer-3 abandonded May 2016 (1)2nd Qtr 5/12/2016
3rd Qtr 7/19/2016
4th Qtr 10/11/2016
lstQtr 2/15/2017
2nd Qtr 6/1/2017
3rd Qtr 7/20/2017
4thQtr ...... ... 10/4/2017
lstQtr 2/17/2018
2nd Qtr 5/9/2018
3rd Qtr 8/8/2018
4th Qtr 11/20/2018
1st Qtr 2/17/2019
2nd Qtr . 5/30/2019
3rd Qtr 8/14/2019
4th Qtr 10/16/2019
DWMRC duplicate of P-3a
1st Qtr 1/30/2020
2nd Qtr 5/20/2020
3rd Qtr 7/15/2020
4th Qtr 11/13/2020
1st Qtr 2/18/2021
2nd Qtr 5/27/2021
3rd Qtr 8/19/2021
4th Qtr 11/23/2021
lstQtr 2/16/2022
2nd Qtr 5/24/2022
3rdQtr 8/17/2022
l. New piezometer PIEZ-3A to replace PIEZ-3 drilled and installed 1n May 2016. First monitonng event.
Shaded = Nitrate, Nitrate+ Nitrite concentrations greater than the Ground Water Quality Standard of 10 mg/I
DRC = Utah Division of Radiation Control
Nitrate Pumping System Started in January 2013 _____ _
As of March 2012 both north and south wild life ponds no longer receiving water. __
May 2016.
8.33 109
8.83 93.8
8.44 100
10.0 111
10.l 124
9.31 105
9.65 107 ----------------------------------------------------------8.61 94.3
9.98 100
12.1 122
11.8 105
11.8 102
11.8 104
10.7 96.2
8.97 83.0
6.4 98.0
10.5 99.5
12.4 88.3
12.8 82.7
13 72.8
11.1 85.9
14.4 85.6
11.2 81.5
9.11 84.6
12.1 91.7
8.8 114.0
10.6 109
Table 12 of 16
Historic Nitrate, Nitrate+ Nitrite and Cloride Concentrations in Monitor Wells Up to the 3rd Quarter 2022
Nitrate Contamination Investigation
White Mesa Uranium Mill
TW4-19{Pumping well starting in Parameter TW4-20 (Pumping well stating in Parameter April2003) August2005)
Sampling Event GWQS Sampling Event GWQS
Nitrate, Nitrate + Nitrite Chloride (mg/I) Nitrate, Nitrate + Nitrite
(10 mg/L) NoGWQ5 (10 mg/L)
1st Qtr 5.3 NA
Chloride (mg/I)
NoGWQ5
3/16/2005
2nd Qtr 5/25/2005 5.7 NA 2nd Qtr 5/25/2005
---------1~~~~: -----3rd Qtr 8/31/2005 4.6 NA l_r~9!r __ _8L3Y~92
4thQtr 12/7/2005 <0.1 81 4th Qtr 12/7/2005 1.80
lstQtr 3/9/2006 4 86 lstQtr 3/9/2006 3.80
2nd Qtr 6/14/2006 5.2 116 2nd Qtr 6/14/2006 9.40
3rd Qtr 7/20/2006 4.3 123 3rd Qtr 7/20/2006 2.90
4thQtr 11/8/2006 4.6 134 4th Qtr 11/8/2006 3.50
lstQtr 2/28/2007 4 133 lstQtr 2/28/2007 4.20
2nd Qtr 6/27/2007 not sampled 2nd Qtr 6/27/2007 2.30
3rd Qtr 8/15/2007 4.1 129 3rd Qtr 8/15/2007 2.10
4thQtr 10/10/2007 4 132 4th Qtr 10/10/2007 5.60
lstQtr 3/28/2008 2.2 131 lstQtr 3/28/2008 0.90
2nd Qtr 6/25/2008 2.8 128 2nd Qtr 6/25/2008 8.00
3rd Qtr 9/10/2008 35.2 113 3rdQtr 9/10/2008 4.44
4thQtr 10/15/2008 47.8 124 4th Qtr 10/15/2008 5.51
lstQtr 3/4/2009 3.2 127 lstQtr 3/4/2009 5.10
2nd Qtr 6/23/2009 2.4 132 2nd Qtr 6/23/2009 2.90
3rd Qtr 9/14/2009 <0.1 43 3rd Qtr 9/14/2009 3.30
4thQtr 12/22/2009 26.7 124 4th Qtr 12/22/2009 5.30
lstQtr 2/17/2010 2 144 lstQtr 2/17/2010 2.00
2nd Qtr 6/14/2010 4.4 132 2nd Qtr 6/14/2010 5.60
3rd Qtr 8/16/2010 5.9 142 3rd Qtr 8/16/2010 5.30
4th Qtr 10/15/2010 2.7 146 4th Qtr 10/15/2010 4.60
1st Qtr 2/17/2011 17.0 135 1st Qtr 2/17/2011 4.40
2nd Qtr 6/7/2011 12.0 148 2nd Qtr 6/7/2011 4.80
3rd Qtr 8/17/2011 3.0 148 3rd Qtr 8/17/2011 6.50
4th Qtr 11/17/2011 5.0 148 4th Qtr 11/17/2011 4.20
1st Qtr 1/23/2012 0.6 138 1st Qtr _1L2~~!...2 7.90 ------------------i---------------------2nd Qtr 6/6/2012 2.4 149 2nd Qtr 6/6/2012 11.00
3rd Qtr 9/4/2012 2.5 149 3rd Qtr 9/4/2012 10.80
4th Qtr 10/3/2012 4.1 150 4th Qtr 10/3/2012 11.00
lstQtr 2/13/2013 8.0 164 1st Qtr 2/13/2013 9.07
2nd Qtr 6/5/2013 3.0 148 2nd Qtr 6/5/2013 9.80
3rd Qtr 9/3/2013 17.6 179 3rd Qtr 9/3/2013 8.65
4th Qtr 10/29/2013 4.7 134 4th Qtr 10/29/2013 9.64
lstQtr 1/27/2014 1.6 134 lstQtr 1/27/2014 7.56
2nd Qtr 5/19/2014 1.3 152 2nd Qtr 5/19/2014 5.95
3rd Qtr 8/11/2014 1.6 140 3rd Qtr 8/11/2014 4.30
4th Qtr 10/21/2014 4.7 130 4thQtr 10/21/2014 7.67
lstQtr 3/9/2015 8.56 238 lstQtr 3/9/2015 9.80
2nd Qtr 6/8/2015 0.916 180 2nd Qtr 6/8/2015 5.76
3rd Qtr 8/31/2015 11.6 326 3rd Qtr 8/31/2015 9.3
4th Qtr _____ --10/19/2015 10.6 252 4th Qtr ----~9/19/2015 6.23 ----------------------------------------------lstQtr 3/9/2016 15.70 276 lstQtr 3/9/2016 10.30
2nd Qtr 5/26/2016 1.27 204 2nd Qtr 5/26/2016 11.2
3rd Qtr 7/25/2016 10.5 214 3rd Qtr 7/25/2016 11.3
4th Qtr 10/13/2016 10.0 200 4th Qtr 10/13/2016 11.4
1st Qtr 3/8/2017 11.1 461 lstQtr 3/8/2017 12.0
2nd Qtr 6/13/2017 0.243 135 2nd Qtr 6/13/2017 9.76
3rd Qtr 7/26/2017 1.120 218 3rd Qtr 7/26/2017 10.8
4thQtr 10/11/2017 0.377 139 4th Qtr 10/11/2017 8.91
lstQtr 3/12/2018 8.6 193 lstQtr 3/12/2018 9.5
2nd Qtr 6/8/2018 0.494 138 2nd Qtr 6/8/2018 10.40
3rd Qtr 8/30/2018 2.55 166 3rd Qtr 8/30/2018 8.14
4th Qtr 11/28/2018 0.233 140 4th Qtr 11/28/2018 9.72
lstQtr 3/8/2019 6.6 197 1st Qtr 3/8/2019 6.7
2nd Qtr 6/5/2019 6.580 160 2nd Qtr 6/5/2019 9.59
3rdQtr 9/4/2019 0.33 153 3rd Qtr 9/4/2019 10.2
4th Qtr 12/10/2019 0.535 147 4thQtr 12/10/2019 9.75
lstQtr 2/19/2020 10.1 205 l stQtr 2/19/2020 9.81
2nd Qtr 5/27/2020 1.140 147 2nd Qtr 5/27/2020 7.23
3rd Qtr 9/4/2020 11.6 188 TW4-20 Abandonded October 2020
4th Qtr 12/10/2020 1.1 104
lstQtr 2/23/2021 6.6 167
2nd Qtr 6/9/2021 4.04 115
3rd Qtr 8/24/2021 6.68 172
4thQtr 12/1/2021 11.1 184
lstQtr 3/9/2022 1.7 119
2nd Qtr 6/8/2022 1.4 128
3rd Qtr 8/30/2022 4.76 178
Shaded = Nitrate, Nitrate+ Nitrite concentrations greater than the Ground Water Quality Standard of 10 mg/I
As of March 2012 both north and south wild life ponds no longer receiving water. __
(2)Pumping well stating in August 2005
131
120
235
134
124
124
112
117
170
132
191
156
168
164
164
153
187
179
200
196
203
220
177
207
186
207 -------262
289
302
252
250
260
272
254
269
299
292
290
296
365
293 -------293
318
307
301
290
281
292
293
289
258
282
295
272
279
286
307
310
301
Table 13 of 16
Historic Nitrate, Nitrate + Nitrite and Cloride Concentrations in Monitor Wells Up to the 3rd Quarter 2022
Nitrate Contamination Investigation
White Mesa Uranium Mill
TW4-21 (Pumping well starting in Parameter TW4-22 (Pumping well stating in
June2015) August2005)
Sampling Event GWQS Sampling Event
Nitrate, Nitrate + Nitrite Chloride (mg/I)
(10 mg/L) NoGWQ5
1st Qtr 3/16/2005 was not sampled 1st Qtr 3/16/2005
2nd Qtr 5/25/2005 14.6 NA 2nd Qtr 5/25/2005
3rd Qtr 8/31/2005 10.1 NA 3rd Qtr 8/31/2005
4th Qtr 12/7/2005 9.6 353 4th Qtr 12/7/2005
1st Qtr 3/9/2006 8.5 347 1st Qtr 3/9/2006
2nd Qtr 6/14/2006 10.2 318 2nd Qtr 6/14/2006
3rdQtr 7/20/2006 8.9 357 3rd Qtr 7/20/2006
4th Qtr 11/8/2006 8.7 296 4th Qtr 11/8/2006
lstQtr 2/28/2007 8.7 306 1st Qtr 2/28/2007
2nd·Qtr 6/27/2007 8.6 327 2nd Qtr 6/27/2007
3rdQtr 8/15/2007 8.6 300 3rd Qtr 8/15/2007
4th Qtr 10/10/2007 8.3 288 4thQtr 10/10/2007
lstQtr 3/28/2008 14.3 331 lstQtr 3/28/2008
2nd Qtr 6/25/2008 8.8 271 2nd Qtr 6/25/2008
3rdQtr 9/10/2008 7.57 244 3rd Qtr 9/10/2008
4th Qtr 10/15/2008 8.0 284 4th Qtr 10/15/2008
lstQtr 3/11/2009 8.3 279 1st Qtr 3/11/2009
2nd Qtr 6/23/2009 8.1 291 2nd Qtr 6/23/2009
3rdQtr 9/14/2009 9.2 281 3rd Qtr 9/14/2009
4th Qtr _____ 12/22/2009 8.4 256 4thQtr 12/29/2009 ----------------------------------------------------------
lstQtr 2/25/2010 8.4 228 1st Qtr 3/3/2010
2nd Qtr 6/14/2010 12.0 266 2nd Qtr 6/14/2010
3rdQtr 8/13/2010 14.0 278 3rd Qtr 8/24/2010
4th_Qtr _____ 10/15/2010 7.0 210 4thQtr 10/15/2010 ----------------------lstQtr 2/22/2011 9.0 303 1st Qtr 2/22/2011
2nd Qtr 6/28/2011 12.0 290 2nd Qtr 6/1/2011
3rd Qtr 8/17/2011 14.0 287 3rd Qtr 8/17/2011
4th Qtr 11/16/2011 13.0 287 4thQtr 11/16/2011
(~1:!1_9!!_ 1/19/2012 15.0 228 {i)lst Qtr 1/19/2012 ------------------.__ _______ ------6/13/2012 2nd Qtr 6/13/2012 11.0 285 2nd Qtr
3rd Qtr 9/13/2012 13.0 142 3rd Qtr 9/12/2012
4th Qtr 10/4/2012 14.0 270 4thQtr 10/4/2012
lstQtr 2/13/2013 11.8 221 (3)1st Qtr--2/11/2013
2nd Qtr 6/18/2013 13.8 243 2nd Qtr 6/5/2013
3rd Qtr 9/13/2013 10.3 207 3rd Qtr 9/3/2013
4th Qtr 11/13/2013 9.0 206 4th Qtr 10/29/2013
lstQtr 2/5/2014 11.4 200 lstQtr 1/27/2014
2nd Qtr 5/22/2014 11.5 243 2nd Qtr 5/19/2014
3rd Qtr 8/27/2014 7.1 230 3rd Qtr 8/11/2014
4thQtr 10/29/2014 10.0 252 4th Qtr 10/29/2014
lstQtr 3/12/2015 10.9 255 lstQtr 3/9/2015
(2)2nd Qtr 6/8/2015 13.1 494 2nd Qtr 6/8/2015
-8/31/2015 --------------------3rd Qtr 14.7 499 3rd Qtr 8/31/2015
~!-~_g.tr 10/19/20~~ 14.3 413 4th Qtr 10/19/2015 ------------------------------------lstQtr 3/9/2016 14.6 452 lstQtr 3/9/2016
2nd Qtr 5/23/2016 13.1 425 2nd Qtr 5/23/2016
3rd Qtr 7/25/2016 16.5 457 3rd Qtr 7/25/2016
4thQtr 10/12/2016 13.5 439 4th Qtr 10/12/2016
lstQtr 3/8/2017 17.7 452 l stQtr 3/8/2017
2nd Qtr 6/13/2017 9.53 309 2nd Qtr 6/13/2017
3rd Qtr 7/26/2017 18.20 447 3rdQtr 7/26/2017
4thQtr 10/11/2017 16.90 378 4th Qtr 10/11/2017
OWMRC split 1W4-21 11.0 310 DWMRC split of TW4-22
lstQtr 3/12/2018 15.8 447 1st Qtr 3/12/2018
2nd Qtr 6/8/2018 14.1 387 2nd Qtr 6/8/2018
3rd Qtr 8/22/2018 0.236 182 3rd Qtr 8/22/2018
4th Qtr 10/22/2018 15.2 378 4th Qtr 11/28/2018
lstQtr 3/8/2019 9.0 180 lstQtr 3/8/2019
2nd Qtr 6/5/2019 17.5 456 2nd Qtr 6/5/2019
3rd Qtr 9/4/2019 14.7 478 3rd Qtr 9/4/2019
4th Qtr 12/10/2019 5.73 339 4th Qtr 12/10/2019
lstQtr 2/19/2020 8.9 446 lst Qtr 2/19/2020
2nd Qtr 5/27/2020 15.4 353 2nd Qtr 5/27/2020
3rd Qtr 9/4/2020 12.6 382 3rd Qtr 9/4/2020
4th Qtr 10/28/2020 16.30 411 4th Qtr 10/28/2020
1st Qtr 2/23/2021 15.2 454 lstQtr 2/23/2021
2nd Qtr 6/9/2021 21.5 461 2nd Qtr 6/9/2021
3rd Qtr 8/24/2021 12.9 375 3rdQtr 8/24/2021
4thQtr 12/1/2021 17.2 227 4th Qtr 12/1/2021
lstQtr 3/9/2022 2.2 110 lstQtr 3/9/2022
2nd Qtr 6/8/2022 . 8.9 331 2nd Qtr 6/8/2022
3rd Qtr 8/30/2022 14.3 425 3rd Qtr 8/30/2022
NA= not analyzed
(1) As of March 2012 both north and south wild life ponds no longer rece1v1ng water
(2) Chloroform pumping well started 6/9/15.
(3) Chloroform pumping well started 1/26/13.
Shaded = Nitrate, Nitrate+ Nitrite concentrations greater than the Ground Water Quality Standard of 10 mg/I
DWMRC = Utah Division of Waste Management and Radiation Control
Parameter
GWQS
Nitrate, Nitrate + Nitrite Chloride (mg/I)
(10 mg/L) NoGWQ5
was not sampled
18.2 NA
15.7 NA
15.1 253
15.3 236
14.3 221
14.5 221
15.9 236
20.9 347
19.3 273
19.3 259
18.8 238
39.1 519
41.9 271
38.7 524
36.3 539
20.7 177
20.6 177
40.3 391
17.8 175
36.8 427
19.0 134
15.0 130
16.0 134
18.0 114
17.0 138
15.0 120
19.0 174
14.0 36 -------------------12.8 35
7.0 121
14.0 130 -------------------58.0 130
50.2 586
29.7 487
45.2 501
54.6 59!
47.2 61•
41.5 54(
54.9 59E
69.2 67'
47.1 390
64.7 557
56.1 567 ---------------------------------31.1 583
58.4 598
61.3 619
61.5 ~
69.8 566
70.8 572
66.1 391
80.l 60C
79.0 610
62.3 607
72.5 580
55.4 613
75.7 567
71.9 528
83.9 662
72.5 588
59.9 608
57.7 606
60.5 578
64.8 514
64.9 523
69.6 618
89.3 408
35.1 410
68.8 586
40.4 442
45.0 564
69.9 637
Table 14 of 16
Historic Nitrate, Nitrate + Nitrite and Cloride Concentrations in Monitor Wells Up to the 3rd Quarter 2022
Nitrate Contamination Investigation
White Mesa Uranium Mill
TW4-24(Pumping well starting in
January2013) Parameter
Sampling Event GWQS
Nitrate, Nitrate + Nitrite Chloride (mg/I)
(10 mg/L) NoGWQ5
2nd Qtr 6/27/2007 26.l 770
3rd Qtr 8/15/2007 29 791
4th Qtr 10/10/2007 24.7 692
lstQtr 3/28/2008 24.4 740
2nd Qtr 6/25/2008 45.3 834
3rd Qtr 9/10/2008 38.4 1,180
4th Qtr 10/15/2008 44.8 1,130
lstQtr 3/4/2009 30.5 1,010
2nd Qtr 6/23/2009 30.4 759
3rd Qtr 9/14/2009 30.7 618
4th Qtr 12/16/2009 28.3 1,080
lstQtr 2/25/2010 33.1 896
2nd Qtr 6/14/2010 30 639
3rd Qtr 8/24/2010 31 587
4thQtr 10/15/2010 31 522
lstQtr 2/17/2011 31 1,100
2nd Qtr 5/26/2011 35 1,110
3rd Qtr 8/17/2011 34 967
4thQtr 11/16/2011 35 608
lstQtr 1/16/2012 37 373 ----------------------i-.-------2nd Qtr 6/6/2012 37 355
3rd Qtr 8/30/2012 37 489
4thQtr 10/3/2012 38 405
lstQtr 2/ii/2013 35.9 1,260 ------------------------------2nd Qtr 6/5/2013 23.7 916
3rd Qtr 8/30/2013 33 998
4th Qtr 10/29/2013 35 1,030
lstQtr 1/27/2014 31.6 809
2nd Qtr 5/19/2014 35.0 1,020
3rd Qtr 8/11/2014 31.5 1,150
4th Qtr 10/21/2014 35.7 1,050
lstQtr 3/9/2015 34.6 944
2nd Qtr 6/8/2015 31.8 1,290
3rd Qtr 8/31/2015 25.3 788
4thQtr 10/19/2015 29.6 909
lstQtr 3/9/2016 29.1 989
2nd Qtr 5/23/2016 24.2 771
3rd Qtr 7/25/2016 34.4 1,180
4thQtr 10/12/2016 31.9 1,010
lstQtr 3/8/2017 41.3 1,090
2nd Qtr 6/13/2017 39.9 1,080
3rd Qtr 7/26/2017 40.0 1,230
4thQtr 10/11/2017 31.7 895
DWMRC split of TW4·24 32.0 1,100
lstQtr 3/16/2018 44.9 1,320
2nd Qtr 6/14/2018 33.6 792
3rd Qtr 8/22/2018 33.8 996
4th Qtr 11/28/2018 38.4 1,100
lstQtr 3/8/2019 39.3 1,040
2nd Qtr 6/5/2019 33.2 1,020
3rd Qtr 9/4/2019 36.4 1,130
4th Qtr 12/10/2019 33.8 1,090
lstQtr 2/19/2020 37.1 1,010
2nd Qtr 5/27/2020 41.7 1060
3rd Qtr 9/4/2020 39.l 1100
4th Qtr 10/28/2020 35.90 1050
lstQtr 2/23/2021 41.9 1,170
2nd Qtr 6/9/2021 48.0 938
3rd Qtr 8/24/2021 26.7 1010
4th Qtr 12/1/2021 43.60 1140
lstQtr 3/9/2022 36.2 890
2nd Qtr 6/8/2022 35.0 944
3rdQtr 8/30/2022 32.0 868
As of March 2012 both north and south wild hfe ponds no longer rece1v1ng water.
Chloroform pumping well started January 2013.
TW4-25 (Pumping well stating in
January2013)
Sampling Event
2nd Qtr 6/27/2007
3rd Qtr 8/15/2007
4th Qtr 10/10/2007
1st Qtr 3/28/2008
2nd Qtr 6/25/2008
3rd Qtr 9/10/2008
4th Qtr 10/15/2008
1st Qtr 3/4/2009
2nd Qtr 6/23/2009
3rd Qtr 9/14/2009
4th Qtr 12/14/2009
lstQtr 2/23/2010
2nd Qtr 6/14/2010
3rdQtr 8/10/2010
4th Qtr 10/15/2010
lstQtr 2/16/2011
2nd Qtr 5/25/2011
3rdQtr 8/16/2011
4th Qtr 11/15/2011
!_5!._S!_r __ 1/16/2012
-5/31/2012 2nd Qtr
3rdQtr 9/4/2012
4th Qtr 10/3/2012
lstQtr 2/11/2013 ------6 /5/2013 (2)2nd Qtr
3rdQtr 9/4/2013
4th Qtr 10/31/2013
lstQtr 1/27/2014
2nd Qtr 5/19/2014
3rd Qtr 8/11/2014
4th Qtr 10/21/2014
lstQtr 3/9/2015
2nd Qtr 6/8/2015
3rdQtr 8/31/2015
4th Qtr 10/19/2015
DWMRC split of TW4-25
lstQtr 3/9/2016
2nd Qtr 5/23/2016
3rdQtr 7/25/2016
4th Qtr 10/12/2016
lstQtr 3/8/2017
2nd Qtr 6/13/2017
3rdQtr 7/26/2017
4th Qtr 10/11/2017
lstQtr 3/12/2018
2nd Qtr 6/14/2018
3rd Qtr 8/22/2018
4th Qtr 11/28/2018
lstQtr 3/8/2019
2nd.Otr 6/5/2019
3rd Qtr 9/4/2019
4th Qtr 12/10/2019
1st Qtr 2/19/2020
2nd Qtr 5/27/2020
3rd Qtr 9/4/2020
4th Qtr 10/28/2020
1st Qtr 2/23/2021
2nd Qtr 6/9/2021
3rd Qtr 8/24/2021
4thQtr 12/1/2021
1st Qtr 3/9/2022
2nd Qtr 6/8/2022
3rd Qtr 8/30/2022
Shaded= Nitrate, Nitrate+ Nitrite concentrations greater than the Ground Water Quality Standard of 10 mg/I
OWMRC = Utah Division of Waste Management and Radiation Control
Parameter
GWQS
Nitrate, Nitrate + Nitrite
(10 mg/L)
17.1
29
17
18.7
22.1
18.8
21.3
15.3
15.3
3.3
14.2
14.4
16
14
15
15
16
16
16
16 -----------16
17
17
9.04 ------------5.24
5.69
6.1
2.16
1.21
1.6
1.03
14.4
1.14
1.63
1.78
1.50
0.837
0.959
1.78
1.24
17.0
0.976
1.23
1.29
2.23
1.14
0.810
0.634
0.639
0.821
0.548
0.841
0.607
0.851
0.994
1.6
3.43
1.57
0.793
0.978
1.8
0.88
1.51
Chloride (mg/I)
NoGWQ5
395
382
358
374
344
333
366
332
328
328
371
296
306
250
312
315
321
276
294
304 -------287
334
338
190 -------136
119
88.6
85.7
51.1
67
58.1
310
58.3
69.2
93.7
94
62.7
75.5
74.1
59.8
285
69.8
70.1
68.0
70.5
60.3
69.1
59.70
65.0
59.0
58.1
73.10
86.0
76.8
67.3
61.3
100.0
55.1
69.3
93.7
70.3
72.8
82.5
Table 15 of 16
Historic Nitrate, Nitrate + Nitrite and Cloride Concent,ations in Monitor Wells Up to the 3rd Quarter 2022
Nitrate Contamination Investigation
White Mesa Uranium Mill
TW4-37(Pumping well starting in Parameter June201S)
Sampling Event GWQS
Nitrate, Nitrate + Nitrite Chloride (mg/I)
(10 mg/L) NoGWQS
2nd Qtr 6/8/2015 35.2 345
3rd Qtr 8/31/2015 32.4 374
~!-~_Qtr 10/19/201~ 34.6 399 ----------------------------------------------------------lstQtr 3/9/2016 28.4 332
2nd Qtr
I
5/23/2016 27.9 389
3rd Qtr 7/25/2016 33.4 294
4thQtr 10/12/2016 26.1 304
lstQtr 3/8/2017 32.3 305
2nd Qtr 6/15/2017 31.2 281
3rd Qtr 7/26/2017 30.5 277
4th Qtr 10/11/2017 30.6 255
1st Qtr 3/12/2018 30.0 263
2nd Qtr 6/8/2018 28.6 275
3rd Qtr 8/22/2018 25.3 387
4thQtr 11/28/2018 27.3 264
lstQtr 3/8/2018 30.1 209
2nd Qtr 6/5/2019 31.2 25C
3rd Qtr 9/4/2019 25.8 228
4thQtr 12/10/2019 25.5 22(
lstQtr 2/19/2020 28.3 231
2nd Qtr 5/27/2020 28.3 32
3rd Qtr 9/4/2020 29.5 27
4thQtr 10/28/2020 28.7 25,
lstQtr 2/23/2021 26.9 24
2nd Qtr 6/9/2021 26.6 171
3rd Qtr 8/24/2021 25.8 220
4thQtr 12/1/2021 31.3 410
lstQtr 3/9/2022 29.8 414
2nd Qtr 6/8/2022 28.0 276
3rd Qtr 8/30/2022 26.6 243
Shaded= Nitrate, Nitrate+ Nitrite concentrations greater than the Ground Water Quality Standard of 10 mg/l
Table 16 of 16
Historic Nitrate, Nitrate+ Nitrite and Cloride Concentrations in Monitor Wells Up to the 3rd Quarter 2022
Nitrate Contamination Investigation
White Mesa Uranium Mill
MW-30 Parameter MW-31 Parameter
Sampling Event GWQS Sampling Event GWQS
Nitrate, Nitrate+ Nitrite Chloride (mg/I) Nitrate, Nitrate+ Nitrite
(10 mg/L) NoGWQ5 (10 mg/L)
2nd Qtr 6/22/2005 12.4 125 2nd Qtr 6/22/2005 24.2
3rd Qtr 9/22/2005 12.8 125 3rd Qtr 9/22/2005 22.4
4th Qtr 12/14/2005 13.6 128 4thQtr 12/14/2005 23.8
lstQtr 3/22/2006 13.8 125 1st Qtr 3/22/2006 24.1
2nd Qtr 6/21/2006 14.5 124 2nd Qtr 6/21/2006 25.3
3rd Qtr 9/13/2006 14.1 118 3rd Qtr 9/13/2006 24.6
4th Qtr 10/25/2006 14.6 124 4th Qtr 10/25/2006 25.1
1st Qtr 3/15/2007 14.4 125 1st Qtr 3/15/2007 23.2
2nd Qtr 2007 not sampled 2nd Qtr 2007 not sampled
3rd Qtr 8/22/2007 14.6 126 3rdQtr 8/22/2007 23.3
4thQtr 10/24/2007 14.9 122 4th Qtr 10/24/2007 24.6 ··-· lstQtr 3/19/2008 14.8 118 lstQtr 3/19/2008 25
2nd Qtr 6/3/2008 18.7 125 2nd Qtr 6/3/2008 29.3
3rd Qtr 8/4/2008 17.3 121 3rdQtr 8/4/2008 28.7
4th Qtr 11/5/2008 15.6 162 4th Qtr 11/5/2008 29.9
lstQtr 2/3/2009 15.3 113 l stQtr 2/3/2009 23.4
2nd Qtr 5/13/2009 15.1 122 2nd Qtr 5/13/2009 22.4
3rd Qtr 8/24/2009 20.9 118 3rd Qtr 8/24/2009 15.4
l4thQtr 10/14/2009 15.0 129 4th Qtr 10/14/2009 22.6
lstQtr 2/9/2010 16.1 127 lstQtr 2/9/2010 21.7
2nd Qtr 4/27/2010 15.8 97 2nd Qtr 5/21/2010 23
3rd Qtr 9/14/2010 15.0 111 3rd Qtr 9/13/2010 21
l4thQtr 12/14/2010 16.0 126 4th Qtr 11/9/2010 20
1st Qtr 2/1/2011 16.0 134 lstQtr 2/1/2011 21
2nd Qtr 6/20/2011 16.0 124 2nd Qtr 6/20/2011 22
3rd Qtr 9/7/2011 17.0 127 3rd Qtr 9/7/2011 21
4th Qtr 12/12/2011 16.0 124 4thQtr 12/12/2011 21
lstQtr 3/14/2012 18.0 128 lstQtr 3/13/2012 22
2nd Qtr 6/18/2012 15 131 2nd Qtr 6/18/2012 21.6
3rd Qtr 9/19/2012 16 130 3rd Qtr 9/18/2012 21
4th Qtr 12/26/2012 17.2 122 4thQtr 12/18/2012 22.2
lstQtr 2/26/2013 21.4 129 1st Qtr 2/19/2013 19.3
2nd Qtr 5/15/2013 18.8 119 2nd Qtr 5/13/2013 23.8
3rdQtr 7/10/2013 17.6 130 3rd Qtr 7/9/2013 21.7
4th Qtr 11/20/2013 19.5 124 4th Qtr 11/18/2013 23.9
lstQtr 2/25/2014 18.4 135 1st Qtr 2/17/2014 20.6
2nd Qtr 6/3/2014 19.5 128 2nd Qtr 6/3/2014 23.1
3rd Qtr 9/9/2014 16.8 139 3rd Qtr 9/3/2014 18.9
4th Qtr 11/10/2014 16.2 154 4th Qtr 11/4/2014 20.9
lstQtr 2/4/2015 14.9 136 1st Qtr 2/2/2015 18.7
2nd Qtr 4/8/2015 17 142 2nd Qtr 4/7/2015 19
3rdQtr 8/11/2015 17.9 165 3rd Qtr 8/10/2015 19.9
4th Qtr 11/11/2015 16.3 140 4th Qtr 11/9/2015 18.4
lstQtr 2/10/2016 20 145 1st Qtr 2/10/2016 18.8
2nd Qtr 5/4/2016 17.3 139 2nd Qtr 5/3/2016 18.6
3rd Qtr 8/18/2016 18 150 3rd Qtr 8/16/2016 19.7
4th Qtr 11/3/2016 18 143 4th Qtr 11/1/2016 19.8
lstQtr 2/2/2017 17.4 150 1st Qtr 2/7/2017 21.1
2nd Qtr 4/5/2017 18.3 146 2nd Qtr 5/1/2017 18.3
3rd Qtr 8/14/2017 19.2 173 3rd Qtr 8/14/2017 19.5
4th Qtr 11/1/2017 17.4 156 4th Qtr 11/1/2017 19
1st Qtr 2/22/2018 17.6 158 1st Qtr 2/20/2018 18.8
2nd Qtr 4/12/2018 17.3 145 2nd Qtr 4/17/2018 19
3rd Qtr 9/11/2018 18 183 3rd Qtr 9/10/2018 20.l
4thQtr _____ 10/22/2018 17.2 140 4th Qtr ______ _ 10/24/2018 18.3 ----------------------------------------------------------------------------------------
1st Qtr 2/13/2019 18.2 167 lstQtr 2/12/2019 18.6
2nd Qtr 4/10/2019 18.5 138 2nd Qtr 4/10/2019 19.7
3rd Qtr 7/16/2019 19.3 181 3rd Qtr 7/16/2019 19.8
4thQtr 10/8/2019 18.2 170 4th Qtr 10/9/2019 19.8
lstQtr 1/15/2020 16.4 182 lstQtr 1/15/2020 17.5
2nd Qtr 4/6/2020 18.1 195 2nd Qtr 4/6/2020 18.8
3rd Qtr 7/6/2020 18.4 185 3rd Qtr 7/7/2020 19.2
4thQtr 12/8/2020 12 166 4th Qtr 12/7/2020 18.8
lstQtr 3/8/2021 17 192 lstQtr 3/9/2021 17.4
2nd Qtr 4/14/2021 17.7 162 2nd Qtr 4/13/2021 18.6
3rd Qtr 7/29/2021 20.6 188 3rd Qtr 7/27/2021 18.7
th Qtr 10/19/2021 14.3 182 4th Qtr 10/19/2021 18.l
Qtr 1/17/2022 14.5 181 1st Qtr 1/19/2022 18.0
Qtr 4/20/2022 17.0 173 2nd Qtr 4/11/2022 18.0
Qtr 7/12/2022 17.6 108 3rd Qtr 7/12/2022 16.9
Shaded= Nitrate, Nitrate+ Nitrite concentrations greater than the Ground Water Quality Standard of 10 mg/I
Chloride (mg/I)
NoGWQ5
139
136
135
133
138
131
127
132
136
122
124
128
124
119
115
124
122
138
128
128
139
138
145
145
148
148
152
138
172
170
174
169
182
174
197
173
210
204
211
211
264
215
246
243
272
267
266
263
310
292
292
308
333
286 ------------296
294
374
318
381
376
370
311
388
377
391
371
370
372
421
Table 2
Summary of QA/QC Duplicate Sample
3rd Quarter 2022
Parameter GWQS Duplicate of TWN-18
TWN-18 TWN-65
Nitrate + Nitrite (as N) 10 mg/L 0.328
Chloride none 40.8
High lighted exceeding PRO (Rehtve % difference) of 20%
NA = Not Analyzed
0.349
40.7
RPO
-6.2
0.2
Data Discrlptions
MW4 MW-26 TW4-1 TW4-2
~.itratll .. (rng/L) 4.20 0.662 0.42 · 3.07
~itr~tll(fl/q ................ ........ 4.20E-03 6.62E-04 ..... 4.20E-04 3.07E-03
~itr~tll .. (lbslL). 9.28E-06 1.46E-06 9.28E-07 6.78E-06•
2.57E-o5· Nitrate (lbs/gal) ....................... 3.51E-05 5.54E-06 3.51E-06
l"~tal.g~ll~n.s .. p.umped 82718.6 28531.3 8512.1 10953.7
lbs of nitrate removed 2.91 0.16 0.03 0.28 I••················ ...... Gallons of nitrate removed 0.24 0.01 0.00 0.02
Total lbs nitrate removed from all pumping wells
Total lbs nitrate removed from nitrate DUmDina wells
Tabel3
DWMRC Nitrate Mass Removal Calculations
Energy Fuels Resorses Inc. White Mesa Mill, Bland, Utah
3rd Quarter 2022
Chloroform Pumping Wells
TW4-4 TW4-11 TW4-19 TW4-21 TW4-37
6.65 6.90 4.76 14.30 26.6
6.65E-03 6.90E-03 4.76E-03 1.43E-02 2.66E-02
1.47E-05 1.52E-05 ·1.osE~os . 3.16E-05 5.88E-05 ........
5.5151:::05 .... 5.77E-05 3.98E-05 1.20E-04 2.22E-04
7928.5 1304.3 137486.6 87160.0 39640.3 ......
0.44 0.08 5.47 10.42 8.82 ...... 0.04 0.01 0.45 0.85 0.72
62
31
Nitrate Pumping Wells
TW4-39 TW4-40 TW4-41 TWN-2 TW4-22 TW4-24 TW4-25
3.72 2.22 5.92 13.9 69.9 32.0 1.51
3.72E-03 2.22E-03 5.92E-03 1.39E-02 6.99E-02 3.20E-02 1.51E-03
8.22E-06 4.90E-06 .... 1.31E-05 3.07E-05 1.54E-04 7.07E-05 3.34E-06 ........ . ..... 1.16E-04 •· 3.11E-05 ........ 1.86E-05 4.95E-05 5.85E-04 2.68E-04 1.26E-05
31305.9 ····· ... 45416.2 11108.0 ... _ 1!5,Q8?,1 21940.2 58456.4 98357.6
0.97 0.8 0.55 1.75 12.83 15.64 1.24 ...... 0.08 0.07 0.04 0.14 1.04 1.27 0.10