DRC-2023-070746 - 0901a06881260681

State of Utah
SPENCER J. COX
Governor
DEIDRE HENDERSON
lieutenant Governor
Department of
Environmental Quality
Kimberly D. Shelley
Executive Director
DIVISION OF WASTE MANAGEMENT
AND RADIATION CONTROL
Douglas J. Hansen
Director
MEMORANDUM
TO: Phil Goble Pe C e,/4/.t)
FROM: Dean Henderson 0?J4 6 /r3 / ,u. "1-7
DATE: June 13, 2023
SUBJECT: Review of the February 6, 2023 4th Quarter 2022 Nitrate Monitoring Report (DRC-2023-
001467) for the Nitrate Contamination 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
February 6, 2023, 4th 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") February 15, 2022 (Revision. 7.7)
REVIEW
The CAP requires the 4th quarter Nitrate Monitoring Report for the Nitrate Contamination Investigation
to be submitted to Division on or before March 1, of each year. The Report was received by the
Division on February 14, 2023 (date of Report February 6, 2023) 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.O. Box 144880 • Salt Lake City, UT 84114-4880
Telephone [phone] • Fax [phone] • T.D.D. [phone]
www.deq.1ttah.gov
Printed on I 00% recycled paper
DRC-2023-070746
Page2
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 4th 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:
I. 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-20 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 64 lbs. of nitrate were removed from the chloroform pumping wells (MW-4, MW-26,
TW4-1, TW4-2, TW4-4, TW4-11, 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 64 lbs. removed, approximately 38 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;
n. 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
through time and, analytical results for each well summarized in data table that includes
historic analytical results for each well; and
Page4
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 4th 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 EFRI 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. 7).
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 4th Quarter 2022
Nitrate Contamination Investigation
White Mesa Uranium Mill
TWN-1 Parameter TWN-2 (Pumping well starting in
January2013)
Sampling Event GWQS Sampling Event
Nitrate, Nitrate + Nitrite Chloride (mg/I)
(10 mg/L) NoGWQS
lstQtr 3/17/2010 0.50 17 1st Qtr 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
lstQtr 1/26/2011 0.5 17 1st Qtr 2/1/2011
2nd Qtr 4/20/2011 0.5 19 2nd Qtr 4/28/2011
3rd Qtr 7/26/2011 0.5 14 3rd Qtr 7/28/2011
4thQtr 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 4/20/2012
3;;ia_;---------------------------------7/31/2012 7/24/2012 0.6 17 3rd Qtr
4thQtr 10/17/2012 0.43 17.5 4thQtr 7/17/2012
l~Qt7°---------------------------------2/19/2013 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 4thQtr 7/16/2013
TWN-65 duplicat of TWN-1 1.48 27.1 DRC split ofTWN-2
DRC split ofTWN-1 1.6 30
DRC duplicate of TWN-1 0.22 30
1st Qtr
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 ofTWN-1 1.4 28
14th Qtr I 10/8/2014 1.46 27.6 4thQtr 10/8/2014
lstQtr I 2/18/2015 1.37 27.8 1st Qtr 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
3rdQtr 8/25/2015 0.624 33.2 3rd Qtr 8/25/2015
14th Qtr 10/13/2015 1.35 27.7 4th Qtr 10/14/2015
lstQtr 2/23/2016 1.51 30.3 1st Qtr 2/23/2016
2nd Qtr 5/17/2016 1.73 32.1 2nd Qtr 5/17/2016
3rdQtr 7/20/2016 1.76 29.6 3rd Qtr 7/20/2016
4th Qtr 10/6/2016 1.98 33 4th Qtr 10/1_1/2016
lstQtr 2/15/2017 2.06 31.2 1st Qtr 2/15/2017
TWN-65 duplicate ofTWN-1 1.98 31.5
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 of TWN-1 1.89 31.4
4th Qtr I 10/4/2017 1.95 30.8 4th Qtr I 10/4/20171
WN-65 duplicate of TWN-1 1.99 32.0
stQtr 1/18/2018 1.86 30.4 1st Qtr 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
st Qtr 2/20/2019 2.1 31.4 1st Qtr 2/20/2019
ndQtr 5/29/2019 1.93 32.6 2nd Qtr 5/29/2019
:rdQtr 8/14/2019 2.15 30.3 3rd Qtr 8/14/2019
-th Qtr 10/16/2019 2.35 32.0 4th Qtr 10/16/2019
~WMRr split ofTWN-1 2.1 31.0 DWMRC split ofTWN-2
1st Qtr 1/29/2020 2.24 33.8 1st Qtr 1/29/2020
2nd Qtr 5/20/2020 2.24 33.0 2nd Qtr 5/20/2020
3rd Qtr 7/15/2020 2.36 30.8 3rd Qtr 7/15/2020
thQtr 11/12/2020 1.89 29.2 4th Qtr 11/12/2020
st Qtr 2/17/2021 2.53 34.1 1st Qtr 2/18/2021
ndQtr 5/25/2021 3.18 34.7 2nd Qtr 5/25/2021
lrdQtr 8/18/2021 2.47 35.7 3rd Qtr 8/18/2021
thQtr 11/23/2021 1.91 37.4 4thQtr 11/23/2021
st Qtr 2/15/2022 3.01 35.6 1st Qtr 2/15/2022
ndQtr 5/24/2022 2.1 33.7 2nd Qtr 5/24/2022
rd Qtr 8/17/2022 2.94 36.7 3rd Qtr 8/17/2022
thQtr 10/25/2022 2.75 30.1 4thQtr 10/25/2022
Shaded = Nitrate, Nitrate + Nitrite concentrations greater than the Ground Water Quality Standard of 10 mg/I
DRC = Utah Division or Radiation Control.
DWMRC = 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
22.1 ------------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
2391
31.91
19.6
19.8
18.6
19.6
19.0
45.1
23.2
18.2
16.0
16.5
16.1
17.2
12
15.4
13.8
15.3
12.7
15.3
14.0
13.9
14.0
Chloride (mg/I)
NoGWQS
85
97
104
93
93
85
74
76
86
103 -------93
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
48.9
Table 2 of 16
Historic Nitrate, Nitrate+ Nitrite and Cloride Concentrations in Monitor Wells Up to the 4th Quarter 2022
Nitrate Contamination Investigation
White Mesa Uranium Mill
IWN•3 Parameter TWN-4
Sampling Event GWQS Sampling Event
Nitrate, Nitrate + Nitrite Chloride (mg/I)
(10 mg/L) NoGWQ5
l stQtr 3/25/2010 25.3 111 1st Qtr 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 4thQtr 12/8/2010
1st Qtr 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
4th Qtr 10/20/2011 25 129 4thQtr 10/18/2011
lstQtr 1/12/2012 25 143 1st Qtr 1/9/2012
2nd Qtr 4/20/2012 24 152 2nd Qtr _4Lt'2f~g ------------------L-------------TWN-65 duplicate ofTWN-4
3rd Qtr 7/31/2012 27 158 3rd Qtr I 7/25/2012
TWN-65 duplicate oflWN-4
4!!'.9-~-10/17/2012 12.1 149 4th Qtr -t 7/15/2012 --------------------------1st Qtr 2/19/2013 22.2 157 1st Qtr 2/18/2013
TWN-65 duplicate ofTWN-4
2nd Qtr 4/24/2013 27.2 158 2nd Qtr I 4/23/2013
3rd Qtr 8/28/2013 20.9 171 3rdQtr 8/27/2013
TWN-65 duplicate ofTWN-4
4th Qtr 10/17/2013 23.5 163 4th Qtr I 7/16/2013
TWN-65 duplicate of TWN-4
lstQtr 1/15/2014 19.6 160 lstQtr 1111412014
TWN-65 duplicate of TWN-4
2nd Qtr 5/7/2014 23.6 168 2nd Qtr I 5/612014
TWN-65 duplicate of TWN-4
3rdQtr 8/6/2014 19.5 174 3rdQtr 8/5/2014
4th Qtr 10{~/2014 19.1 153 4th Qtr 10/8/2014
lstQtr 2/19/2015 19.4 164 lstQtr 2/18/2015
2nd Qtr 5/14/2015 17.2 141 2nd Qtr 5/13/2015
3rdQtr 8/26/2015 16.2 156 3rd Qtr 8/25/2015
TWN-65 duplicate of TWN-4
4th Qtr 10/14/2015 16.3 129 4th Qtr I 10/13/2015
TWN-65 duplicate of TWN-4 ------------------------------------------1st Qtr 2/24/2016 16.8 128 lstQtr 2/23/2016
2nd Qtr 5/18/2016 13.5 116 2nd Qtr 5/17/2016
3rdQtr 7/20/2016 16.8 110 3rd Qtr 7/20/2016
4th Qtr 10/7/2016 15.8 113 4thQtr 10/6/2016
1st Qtr 2/16/2017 17.4 113 1st Qtr 2/15/2017
2ndQtr 6/2/2017 15.9 108 2nd Qtr 6/1/2017
3rd Qtr 7/20/2017 15.9 106 3rd Qtr 7/19/2017
4th Qtr 10/4/2017 15.6 111 4thQtr 10/4/2017
lstQtr 1/19/2018 14.4 107 1st Qtr 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 of TWN-4
4th Qtr 11/21/20181 20.11 123 4thQtr I 1112012018
TWN-65 duplicate ofTWN-4
lstQtr 2/21/2019 20.7 140 1st Qtr 2/20/2019
2nd Qtr 5/30/2019 18.7 137 2nd Qtr 5/29/2019
3rd Qtr 8/15/2019 19.8 133 3rd Qtr 8/14/2019
4th Qtr 10/17/2019 19.6 126 4thQtr 10/16/2019
DWMRC split ofTWN-3 17.0 130 TWN-65 duplicate ofTWN-4
OWMRC split ofTWN-4
TW4-40 OWMRC duplicate of TWN
4
1st Qtr I 1/30/202~1 19~1 156 1st Qtr I 1/29/2020
2nd Qtr 5/21/2020 24 136 2nd Qtr 5/20/2020
TWN-65 duplicate ofTWN-4
3rd Qtr I 7/15/20201 22.21 130 3rd Qtr I 7/15/2020
TWN-65 duplicate ofTWN-4
4thQtr 11/13/2020 18 137 4th Qtr 11/12/2020
1st Qtr 2/18/2021 23.8 145 1st Qtr 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
4th Qtr 11/24/2021 17.4 147 4th Qtr 11/23/2021
TWN-65 duplicate of TWN-4
lstQtr 2/16/2022 25.3 140 1st Qtr 2/16/2021
2ndQtr 5/25/2022 24 157 2nd Qtr 5/25/2022
3rd Qtr 8/18/2022 28.2 163 3rd Qtr 8/18/2022
4th Qtr 10/26/2022 26 156 4thQtr 10/25/2022
Shaded = Nitrate, Nitrate+ N1tnte concentrations 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
1.45 ------------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
1.31
Chloride (mg/I)
NoGWQ5
22
22
19
21
21
21
35
20
20
24 -------24
25
26
26.4 -------25.3
25.9
24.4
27.2
29.0
29.4
32
28.4
26.4
29.1
26.1
28
30.7
31.5
31.9
35.2
35.2
28.4
..?.5_,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
21.2
TWN-5
Sampling Event
Table3 of 16
Historic Nitrate, Nitrate + Nitrite and Cloride Concentrations in Monitor Wells Up to the 4th Quarter 2022
Nitrate Contamination Investigation
Parameter
GWQS
Nitrate, Nitrate + Nitrite
(10 mg/L)
White Mesa Uranium Mill
Chloride (mg/I)
NoGWQS
TWN-6
Sampling Event
Parameter
GWQS
Nitrate, Nitrate + Nitrite
(10 mg/L)
Chloride (mg/I)
No"GWQS
1st. (ltr .. 3/16/2010 ... 4.3. 1st Qtr 3/23/2010 19 2nd (ltr ........... s/ii,/i.oio .. .. . 0.3 44 2nd Qtr 6/1/2010 22
3rd Qtr 7 /iiiioio 0.3 43 3rd Qtr 7/13/2010 1.4 73
11_4_th_Q~t_r ___ 1_2~/7~)_2o_i_o+-·· ________ 0_.3-+-_____ 4 .... 5 4th Qtr 12/7/2010,__ _______ --, _____ 21_.,
1st ().tr. 1/25/2011 0.4 .... 47 1st Qtr 1/26/2011 18
?nd (ltr ·· ·· · ·· ·· ·· 4/20/20ii 0.3 .44 2nd Qtr 4/20/2011 1.5 22
3rd ().tr jji.i;ji.oii 0.3 44 3rd Qtr 7/27/2011 1.1 17
ll-'4-"th'-Q"'-t"-r_ .. _ .. _ .. _ .. cccio"-/...,.17~j_io~i_it-.. -------~-+------4-f5 4th Qtr 10/18/20111-----------t-----21'-II
1st (ltr . 1/9/2012 ........ 4.5 1st Qtr 1/10/2012 20
2nd ().tr ............ 4/1s/i.oii .. . . 39 2nd Qtr 4/18/2012 22
3rd (ltr 7/24hoii ..... 48 3rd Qtr 7/25/2012 22
4th Qtr ······· 10/is/_2~01_2+ .. <~0'-.1 _______ ~ ____ 4_3_.5-t-4_th~Q'-tr __ ~7/15/2012 20.4
1st ().tr 2013 NA .. . .. .. .. . .. .. .. .. .. 1st qtr 2013 NA
IF2'-"n..;;.d..;;Q:;;tr ____ -'-'-'-'-'-----------------12nd(ltr2013 ..
TWN-5 abandoned on July 31, 2013 .3rd qtrJ013 .
4th Qtr 2013
NA= Per the CAP and SCO, not sampled
1st (ltr 2014 ..
2nd Qtr 2014
3rd Qtr 2014
4th Qtr 2014
1st Qtr 2.01.5 .
2nd Qtr 2015
3rd Qtr 2015
4th Qtr 2015
.ls.t. (ltr 2016 ..
2nd Qtr 2016
3rd().tr .2.01.6 ....
4th Qtr 2016
1st Qtr 2.017 .
. 2nd qtrJ017
3rd qtr 2017
4th Qtr 2017
1st (ltr 2018 ..
2nd(ltr .201.8.
3rd().tr 2018
4th Qtr 2018
1st Qtr 2()19 .
2~d Cltr 2019 ..
.3.r.d qtr 2019 ..
4th Qtr 2019
.ls.t. (ltr 202() ...
2nd qtr 2020 .
3rd. qtr .2020 ..
4th Qtr 2020
1st Qtr 2()21 .
. 2nd qtr 2021
.3r.d qtr 2.021 ...
4th Qtr 2021
1st Clt.r .. 202.2 ....
2nd(ltr2022
3rd Qtr 2022 ii iii oii ioff ··
NA
NA
NA
NA
NA
NA
NA
NA
NA
TWN-7
Table 4 of 16
Historic Nitrate, Nitrate + Nitrite and Cloride Concentrations in Monitor Wells Up to the 4th Quarter 2022
Nitrate Contamination Investigation
White Mesa Uranium Mill
Parameter TWN-8 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 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 lstQtr 1/9/2012 <0.1
2nd Qtr 4/20/2012 1.2 6 2nd Qtr 4/18/2012 <0.1 ------------------~-------------7/24/2012 ------------3rd Qtr 7/26/2012 0.9 6 3rd Qtr <0.1
4thQtr 10/16/2012 0.64 5.67 4thQtr 10/15/2012 <0.1
Chloride (mg/I)
NoGWQS
11
11
11
9
13
10
18
10
11
15 -------11
11.1 -2j19ji013 ------------~------------· ------------------------1st Qtr 0.59 5.68 1st Qtr 2013 NA
2nd Qtr 4/24/2013 1.16 5.88 2nd Qtr I 2013 NA
3rd Qtr 8/28/2013 0.835 6.96 TWN-8 abandoned on July 31, 2013
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
lstQtr 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 _____ 10/14/20;~ 0.672 5.84 ----------------------------------------------------------lstQtr 2/24/2016 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
lstQtr 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
3rdQtr 8/9/2018 10.6 105
4th Qtr 11/21/2018 11.5 104
lstQtr 2/21/2019 12.9 107
2nd Qtr 5/30/2019 13.5 122
3rd Qtr 8/15/2019 12.9 120
4thQtr 10/17/2019 14.5 119
OWMRC split ofTWN-7 12.0 120
lstQtr 1/30/2020 14.2 128
2nd Qtr 5/21/2020 14.6 126
3rdQtr 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 11/24/2021 7.66 130
1st Qtr 2/17/2022 16.9 120
2nd Qtr 5/25/2022 16.0 127
3rdQtr 8/18/2022 14.6 128
14th Qtr 10/26/2022 15.7 129
Shaded = Nitrate, Nitrate+ Nitrite concentrations greater than the Ground Water Quality Standard of 10 mg/l _J
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.
Table 5 of 16
Historic Nitrate, Nitrate+ Nitrite and Cloride Concentrations in Monitor Wells Up to the 4th 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 3rdQtr 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 lstQtr 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 3rdQtr 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 of TWN-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
4thQtr 10/17/2012 12.5 194 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
3rdQtr 9/27/2010 1.4 76 3rd Qtr 7/12/2010 0.7
4th Qtr 12/8/2010 1.4 72 4th Qtr 12/7/2010 0.7
lstQtr 1/27/2011 1.4 84 1st Qtr 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 1.6 69 1st Qtr 1/10/2012 0.9
ate of TWN-11 1.6 70
2nd Qtr
I
4/19/2012 1.6 71 2nd Qtr 4/18/2012 1.2
3rd Qtr 7/25/2012 1.8 77 3rd Qtr 7/25/2012 1.4
4thQtr 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
31
2
2:
4,
2:
2:
33
44
28
33
30.8
Chloride (mg/I)
NoGWQS
113
106
112
103
87
109
102
87
104
106
102
101
TWN-13
Sampling Event
Table& of 16
Historic Nitrate, Nitrate+ Nitrite and Cloride Concentrations in Monitor Wells Up to the 4th Quarter 2022
Nitrate Contamination Investigation
Parameter
GWQS
Nitrate, Nitrate + Nitrite
(10 mg/L)
White Mesa Uranium Mill
Chloride (mg/I)
NoGWQS
TWN-14
Sampling Event
Parameter
GWQS
Nitrate, Nitrate + Nitrite
(10 mg/L)
Chloride (mg/I)
NoGWQS
1st O.tr . .. .. . }/17/2010 <0,1 . .. .. .. .. .. .. .. 47. 1st O.tr 3/24/2010 .. . .. .. .. . .. . . . 2.9 24
2nd O.tr 5/26/2()10 .49 2nd O.tr 6/2(2010 2.9 30
3rd.Q.tr 9/27/2010 53 3rd O.tr 7f15/2010 3.5 26
4th Qtr . 12/j)-"20"-'i'-"o+--------"--t------....C5-'--71-'4-"th-'--QCOt'-r--+-"'12='-/-"10"'-/-"20"-'1'-"0+-------~-"-"t------....C2:=.j81
1st Qtr ........... 1/25/20.1_1 _ 1.6 28/2Clll 24
2nd.Q.tr 4/~~/291150,1 27/2011 30
3rd(ltr ... ]/26/201! . 0.1 29 2
4th Qtr 10/17/c.c2c.c0.ccllc+-<0"".""1 _______ +-----=1--'-""-""'--+.=,,
1st O.tr .. 1/9/2012 <0.1 2nd Qtr ..... 4/is/i.oii <Oj.
3rd O.tr . . . )A4/2oii 0.1 7
4th Qtr
1st O.tr
2nd Qtr
TWN-13 abandoned on July 31, 2013 3 r_d Cltr_ . 2013 NA
NA= Per the CAP and sea, not sampled
4th Qtr
lstQtr
2nd O.tr
3rd O.tr ...
4th Qtr
lstQ.tr.
2nd O.tr
_3_r_d Cltr ...
4th Qtr
lstqtr
2n.dCl,tr ..
3rd(:ltr ..
4th Qtr
1st Qtr.
2ndQtr ... .
. 3r.d Cltr .. .
4th Qtr
lstqtr.
2n.d_O.tr .....
3rd(:ltr
4th Qtr
lstCltr .
2nd Qtr.
3rdCltr ...
4th Qtr
1st (ltr
2nd O.tr ..
3rdQtr
4th Qtr
lstO.tr ..
2nd(:ltr.
3rdqtr ....
4th Qtr
1st qtr
2n_d qtr .
3rd Qtr .iiiio.tr
2014 NA
2016,_N_A _____________ _,,
2016 NA
TWN-15
Sampling Event
Table7 of 16
Historic Nitrate, Nitrate+ Nitrite and Cloride Concentrations in Monitor Wells Up to the 4th 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
1st Qtr 3/18/2010 ............. _g:z _ ............................. '.1.~. ~st ().tr . 3/17/2010 ..................................... 1.-? ........ ·····--35
2nd Qtr -sJi.S/2010 _ 1.0 3.~ 2nd qtr 5/27/2010 1.3 . . .................. 35
3rd(),tr .. 7/13/2010 36 3rd Qtr 9/27/2010 2.6 35
4th Qtr ......... iiJiihoio 38 4th Qtr 12/9/2010 30
1st (),tr 1/27/2011 1.4 43 1st qtr ..... . 1/27(2011 . 34
2".~ (ltr · ·· · "i,ii.i /iii ii · 1.6 49 2nd (ltr 4/27/2011 1.6 39
3r.d .Cl.tr.. . . . . iiistiiiii ... 7/27 hoii 31
4th Qtr .... iOl.!9:.c/::;20:..:i;.::;11-· ·--------=:+------=,l-'-"-'-='----!-'-1=0/18/~:2_0_11_,· ________ __,_ _____ 3_,4,
~~t Cl.tr. 1/11/2012 .. 1/10/2012 33
2nd Qtr .. 4/iojioii 1.6 4/19/2()12 .
TW4-70 duplicate ofTWN-15 !~t ~; .··.· ,~i~~~ciii
NA= Per the CAP and sea, not sampled
1.7
2.1 ............. s() 3r~qtr . 1/25f2oii
1.79 47 4th Qtr 7/16/2012
2.0 44.4
1st Qtr
2n.dO,tr
3rd (ltr ............. 20.15 NA
4th Qtr
.1.st Qtr
2nd Qtr
3rd O,tr
4th Qtr
1st (),tr .
2n.d. (),tr ...
3rd (ltr
4th Qtr
1st Qtr ..
2n.d Qtr
_3r.d Cltr.
4th Qtr
lst(),U
2n.d.Qtr.
3rd(ltr ...
4th Qtr
.1s.t.O,tr
2ndQtr
3rd qtr ..
4th Qtr
1st Qtr in<101:r·······
3rd Cl.tr
4th Qtr
lst(l.t,t.
2nd Qtr ..
3rd Qtr
4thQfr
2019 NA ............
2019 NA
2020 NA
2021 NA ···········""'' ., ....
. .2022. N.A ....
2022 NA
ioii NA
so ...............
33
32.1
Table 8 of 16
Historic Nitrate, Nitrate+ Nitrite and Cloride Concentrations in Monitor Wells Up to the 4th 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 1st Qtr 3/17/2010
2nd Qtr 6/3/2010 11 87 2nd Qtr 6/1/2010
3rd Qtr 7/15/2010 8.9 66 3rd d.tr 9/27/2010
4th Qtr 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
l4thQtr 10/20/2011 8.1 71 4th Qtr 10/18/2011
1st Qtr 1/12/2012 8.7 79 1st Qtr 1/10/2012
9.1 80 2nd Qtr 2nd Qtr 4/20/2012 4/19/2012 ----------------------~-------------7/26/2012 3rd Qtr 7/27/2012 9.5 85 3rd Qtr
14th Qtr 10/17/2012 9.65 84.8 4thQtr 7/16/2012 ------------------~------------2/18/2013 1st Qtr 2013 NA 1st Qtr
2nd Qtr 2013 NA 2nd Qtr 4/23/2013
TW4-65 dup ofTWN-18
3rd Qtr 2013 NA 3rd Qtr
I
8/27/2013
TWN-17 abandoned on July 31, 2013 4th Qtr 10/16/2013
ORC split sample
lstQtr 2/14/2014
2nd Qtr 5/6/2014
3rdQtr 8/5/2014
4th Qtr 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
4thQtr 10/13/2015
TW4-65 dup ofTWN-18
lstQtr 2/23/2016
2nd Qtr 5/17/2016
3rd Qtr 7/21/2016
4thQtr 10/6/2016
1st Qtr 2/15/2017
2nd Qtr 6/1/2017
3rdQtr 7/19/2017
4thQtr 10/4/2017
lstQtr 1/18/2018
2nd Qtr 5/8/2018
3rd Qtr 8/8/2018
4th Qtr 11/2_1/2018
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 of TWN-18
lstQtr I 1/29/2020
TWN-65 dup of TWN-18
2nd Qtr I 5/20/2020
3rdQtr 7/15/2020
4th Qtr 11/12/2020
TWN-65 dup ofTWN-18
lstQtr I 2/17/2021
TWN-65 dup ofTWN-18
2nd Qtr I 5/25/2021
TWN-65 dup ofTWN-18
3rd Qtr I 8/17/2021
TWN-65 dup of TWN-18
4th Qtr I 11/23/2021
1st Qtr I 2/15/2022
TWN-65 dup of TWN-18
2nd Qtr I 5/24/2022
TWN-65 dup ofTWN-18
3rd Qtr I 8/17/2022
TWN-65 dup of TWN-18
4th Qtr I 10/25/2022
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
0.212
Chloride (mg/I)
NoGWQS
42
63
64
59
61
67
65
60
64
64 -------67
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
52.7
67.4
62.1
63.9
59.0
56.6
53.1
57.8
59.7
48.1
46.4
49.9
50.0
53.3
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
46.5
40.9
40.5
40.7
39.6
40.8
40.7
35.6
Table 9 of 16
Historic Nitrate, Nitrate + Nitrite and Cloride Concentrations in Monitor Wells Up to the 4th Quarter 2022
Nitrate Contamination Investigation
TWN-19
Sampling -Event
Parameter
GWQS
Nitrate, Nitrate + Nitrite
(10 mg/L)
1st_ Cltr __ __ _ ____ 3/23/2_010 __ _
2nd Qtr 6/1/2010
3rd qtr 9/21{2010
4th Qtr 12/9/2010
1st Cl.tr__ 2/1/2011
2nd Cltr _ .iiisiioii
3-_rd Cl.tr -----7 /is/~011
4th Qt~ 10/18/2011
1.S.t Cltr 1/10/2_012 ______ _
2nd (),tr 4/19/2012_
3rd qtr 7/26/2012
4th Qtr --iob:.shoi:i
1st (ltr 2013 NA
2_nd (),tr __ 2013 NA
3rd (ltr 2013 NA
4th Qtr 2013 NA
1st Cltr ______ _
2nd Qtr
3rd(),tr __
4th Qtr
~st Cl.tr_
2n_d(ltr __
3r~ (ltr _
4th Qtr
1st_ (ltr __
2nd Cl.tr
3rd Cl.tr
4th Qtr
1st (ltr
2_n_d Qtr
3r_d(ltr_
4th Qtr
ls_t_ Cltr __ _
2nd(ltr
3rd (ltr ___ _
4th Qtr
1st Qtr
2nd_(ltr __
3rd_ Cl.tr
4th Qtr
1st_ Cltr __ _
2nd qtr
3rd qtr
4th Qtr
1st (ltr _
2nd_(),tr
3r_d Cltr __
4th Qtr
1st Cltr ____ _
2ndqtr
3rdQtr 4thQtr--
2015 NA
2015 NA
2015 NA
2018 NA
2018 NA
2018 NA .... "'"'""'"'"'""
2019 NA
2019 NA
2019 NA
2020 NA
2020 NA
2020 NA
2020 NA
2021 NA
2021 NA
2022 NA --ioi2Nli -
TWN-20
Sampling Event
7.2
6.9
Parameter
GWQS
Nitrate, Nitrate + Nitrite
(10 mg/L)
White Mesa Uranium Mill
Upper Wildlife Pond
Sampling Event
Parameter
GWQS
Chloride (mg/I)
NoGWQS
Nitrate, Nitrate + Nitrite
(10 mg/L)
3/18/2010 <0.1 -----i,ii{2oio <0.1_
7/19/2010_ <O,l
12/10/2010 <0.1
__________ 114 1st Cl.tr _ _ _ __ _ 1{31/2011
_ go 2n_d Cltr 4/25/2CJ11 ~0,1
___ 1_1_3_ 3-rd (ltr 7 /2S/2011 <0.1
108 4th Qtr -io/1.9/io1i <O.i -
_ 1_14_ 1st Qtr 1/31/2012
117 Pond no longer in service
117
118
Chloride (mg/I)
NoGWQS
TWN-21
Sampling Event
Parameter
GWQS
Nitrate, Nitrate + Nitrite
(10 mg/L)
2nd qtr 6/3/2021 1.88 SO 2nd(ltr 6/3/2021
3rd(ltr __ _-.-_. _. Sfl9{202i 0.96 _ 35,3 3rd Cltr _____ ·····_ 8/19/2CJ2~
1.03
1.16
Chloride (mg/I)
NoGWQS
<1.0
Chloride (mg/I)
NoGWQS
41.9
40.5
4th Qtr 11/23/,.:2:.::0=:21-_______ o:.;_•:=;28:..:6+-___ ...:3:..:3~.6'1-4~t-"-h-"Q"'tr_-+-=11/23/'-"2CC0=:21---------'--'-'--'+--
1st Cl.tr 2/16/20_2_2 _ _ o,436 ____ 31_,2 1st Qtr 2/16/2022
Q_696 42.6
1.1 40.4
2nd (ltr _________ 5/25/2.02? 0.54 __ 29_.? 2nd(ltr ----5/25/2022
3rd Qtr 8/18/2022 0.48 32.4 3rd Qtr -8/18/2022 · ------
4th a.tr io/2"ii/Z022 o.«ii 3i.o 4th a.tr -10126/ioii
1.1 39.8
1..19 42.7
1~08 -4ij
NA= Per the CAP and sea, not sampled
Table 10 of 16
Historic Nitrate, Nitrate + Nitrite and Cloride Concentrations in Monitor Wells Up to the 4th 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) NoGWQS (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
4thQtr 12/10/2010 6.5 60 4th Qtr 12/10/2010 0.2
1st Qtr 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
4thQtr 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 4/20/2012 0.2 ----------------------------7/27/2012 ------------3rd Qtr 7/27/2012 7.2 56 3rd Qtr 0.2
4thQtr 10/17/2012 7.66 55 4thQtr 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
4thQtr 10/16/2013 6.68 54.1 4th Qtr 10/16/2013 0.36
DRC split of Piez-1 1.3 60 ORC 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
3rdQtr 8/6/2014 5.1 55 3rd Qtr 8/6/2014 0.8
4th Qtr 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 3rdQtr 8/6/2015 0.7
~~~_gtr 10/14/20~~ 6.17 54.4 4th Qtr ______ _ 10/14/2015 0.692 ---------------------------------------------
lstQtr 2/23/2016 8.31 56.S lstQtr 2/23/2016 0.615
2nd Qtr 5/12/2016 6.33 59.1 2nd Qtr 5/12/2016 0.665
3rd Qtr 7/19/2016 6.78 53.9 3rdQtr 7/19/2016 0.669
4th Qtr 10/11/2016 6.42 58.1 4th Qtr 10/11/2016 0.732
lstQtr 2/15/2017 6.75 54.5 lstQtr 2/15/2017 0.696
2nd Qtr 6/1/2017 6.6 54.7 2nd Qtr 6/1/2017 0.345
3rdQtr 7/20/2017 6.8 58 3rd Qtr 7/20/2017 0.555
4th Qtr 1or.y2011 6.21 54.4 4th Qtr 10/4/2017 0.684
lstQtr 1/17/2018 6.35 55.3 lstQtr 1/17/2018 0.716
2nd Qtr 5/9/2018 6.56 58 2nd Qtr 5/9/2018 0.776
3rdQtr 8/8/2018 6.66 63.S 3rd Qtr 8/8/2018 0.818
4thQtr 11/21/2018 6.7 55.5 4th Qtr 11/20/2018 0.648
lstQtr 2/19/2019 6.72 56.8 lstQtr 2/19/2019 0.599
2nd Qtr 5/30/2019 6.75 59.4 2nd Qtr 5/30/2019 0.702
3rdQtr 8/14/2019 6.81 61.1 3rdQtr 8/14/2019 0.606
4th Qtr 10/16/2019 7.21 59.3 4th Qtr 10/16/2019 0.573
DWMRC_duplicate of P-1 6.4 60 DWMRC duplicate of P-2 0.36
lstQtr 1/30/2020 7.12 68.9 lstQtr 1/30/2020 0.740
2nd Qtr 5/20/2020 6.95 67.7 2nd Qtr 5/20/2020 0.679
3rdQtr 7/15/2020 7.3? 63.6 3rdQtr 7/15/2020 0.793
4th Qtr 11/13/2020 7.51 63.9 4th Qtr 11/13/2020 0.544
lstQtr 2/18/2021 7.34 57.5 lstQtr 2/18/2021 0.401
2nd Qtr 5/27/2021 7.89 69.9 2nd Qtr 5/27/2021 <0.1
3rdQtr 8/19/2021 7.6 70 3rd Qtr 8/19/2021 0.11
4th Qtr 11/23/2021 4.69 65.5 4th Qtr 11/23/2021 <0.1
lstQtr 2/16/2022 7.4 68.8 lstQtr 2/16/2022 0.330
2nd Qtr 5/24/2022 5.9 70.3 2nd Qtr 5/24/2022 0.48
3rdQtr 8/17/2022 6.37 72 3rdQtr 8/17/2022 0.71
4thQtr 10/25/2022 6.36 73.6 4th Qtr 10/25/2022 0.703
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. __
Chloride (mg/I)
NoGWQS
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.S
13.1
15.S
13.3 --------------13.4
14
12.4
13.4
12.4
13.2
13.4
12.7
13.0
14.0
15.1
12.3
12.9
12.6
13.2
12.6
21
14.2
14.4
12.7
12.9
15.7
13.9
14.6
14.8
14.0
12.6
14.7
13.4
Table 11 of 16
Historic Nitrate, Nitrate + Nitrite and Cloride Concentrations in Monitor Wells Up to the 4th 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
3rdQtr 7/19/2010 1.8 35
l4thQtr 12/9/2010 1.8 25
1st Qtr 1/31/2011 1.8 40
2nd Qtr 4/25/2011 1.7 35
3rdQtr 7/25/2011 1.8 61
l4thQtr 10/19/2011 1.7 12
1st Qtr 1/11/2012 1.8 20
2nd Qtr 4/20/2012 1.7 53 ------------------1---------3rdQtr 7/27/2012 1.8 21
4th Qtr 10/17/2012 2.75 20.1 ------------------1---------l stQtr 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 23,5
DRC split sample 0.33 27
1st Qtr 1/13/2014 1.7 26
2nd Qtr 5/7/2014 1.79 23,9
3rdQtr 8/6/2014 1.7 26
4th Qtr 10/8/2014 1.74 28,3
lstQtr 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
4th Qtr _____ --10/14/2015 2.24 39.5 New piezometer P-3A to replace piezometer P-3 drilled and installed in ----------------------------------------------------------lstQtr 2/23/2016 1.82 27.3
Pizometer-3 abandonded May 2016 (1)2nd Qtr 5/12/2016
3rdQtr 7/19/2016
4th Qtr 10/11/2016
lstQtr 2/15/2017
2nd Qtr 6/1/2017
3rd Qtr 7/20/2017
4th Qtr ______ ---10/4/2017
1st Qtr 2/17/2018
2nd Qtr 5/9/2018
3rdQtr 8/8/2018
4th Qtr 11/20/2018
lstQtr 2/17/2019
2nd Qtr 5/30/2019
3rd Qtr 8/14/2019
4th Qtr 10/16/2019
DWMRC duplicate of P-3a
lstQtr 1/30/2020
2nd Qtr 5/20/2020
3rd Qtr 7/15/2020
4th Qtr 11/13/2020
lstQtr 2/18/2021
2nd Qtr 5/27/2021
3rdQtr 8/19/2021
4th Qtr 11/23/2021
lstQtr 2/16/2022
2nd Qtr 5/24/2022
3rdQtr 8/17/2022
4th Qtr 10/25/2022
1. New piezometer PIEZ-3A to replace PtEZ-3 drilled and installed in May 2016. First monitoring event.
Shaded= Nitrate, Nitrate+ Nitrite concentrations greater than the Ground Water Quality Standard of 10 mg/l
ORC = 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
10.1 124
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
105 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
11.5 81.5
Table 12 of 16
Historic Nitrate, Nitrate + Nitrite and Cloride Concentrations in Monitor Wells Up to the 4th Quarter 2022
Nitrate Contamination Investigation
White Mesa Uranium Mill
TW4-19(Pumping well startin1 in Parameter TW4-20 (Pumping well statin1 in Parameter April 2003) August2005)
Sampling Event GWQS Sampling Event GWQS
Nitrate, Nitrate+ Nitrite Chloride (mg/I) Nitrate, Nitrate + Nitrite
(10 mg/L) NoGWQ5 (10 mg/L)
lstQtr 3/16/2005 5.3 NA
2nd Qtr 5/25/2005 5.7 NA 2nd Qtr 5/25/2005 10.10
3rd Qtr 8/31/2005 4.6 NA 3rd Qtr 8/31/2005 2.90
4th Qtr 12/7/2005 81 4th0tr---12/7/2005 ------------<0.1 1.80
lstQtr 3/9/2006 4 86 1st Qtr 3/9/2006 3.80
2nd Qtr 6/14/2006 5.2 116 2nd Qtr 6/14/2006 9.40
3rdQtr 7/20/2006 4.3 123 3rd Qtr 7/20/2006 2.90
4th Qtr 11/8/2006 4.6 134 4thQtr 11/8/2006 3.50
lstQtr 2/28/2007 4 133 1st Qtr 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
4th Qtr 10/10/2007 4 132 4th Qtr 10/10/2007 5.60
lstQtr 3/28/2008 2.2 131 1st Qtr 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 3rd Qtr 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 1st Qtr 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 1st Qtr 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
4thQtr 10/15/2010 2.7 146 4th Qtr 10/15/2010 4.60
lstQtr 2/17/2011 17.0 135 lstQtr 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 3rdQtr 8/17/2011 6.50
4thQtr 11/17/2011 5.0 148 4th Qtr 11/17/2011 4.20
lstQtr 1/23/2012 0.6 138 lstQtr 1/23/2012 ---------7;99_ -------------------L--------------6/6/2012 2nd Qtr 6/6/2012 2.4 149 2nd Qtr 11.00
3rd Qtr 9/4/2012 2.5 149 3rdQtr 9/4/2012 10.80
4thQtr 10/3/2012 4.1 150 4th Qtr 10/3/2012 11.00
1st Qtr 2/13/2013 8.0 164 lstQtr 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 3rdQtr 9/3/2013 8.65
4thQtr 10/29/2013 4.7 134 4th Qtr 10/29/2013 9.64
1st Qtr 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 4th Qtr 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
~~-~_gtr 10/19/201~ 10.6 252 4th Qtr 10/19/2015 6.23 -----------------------------------------------------------------------------------------
1st Qtr 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
3rdQtr 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
lstQtr 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 3rdQtr 7/26/2017 10.8
4th Qtr 10/11/2017 0.377 139 4th Qtr 10/11/2017 8.91
1st Qtr 3/12/2018 8.6 193 1st Qtr 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 3rdQtr 8/30/2018 8.14
4thQtr 11/28/2018 0.233 140 4th Qtr 11/28/2018 9.72
1st Qtr 3/8/2019 6.6 197 lstQtr 3/8/2019 6.7
2ndQtr 6/5/2019 6.580 160 2nd Qtr 6/5/2019 9.59
3rd Qtr 9/4/2019 0.33 153 3rd Qtr 9/4/2019 10.2
4thQtr 12/10/2019 0.535 147 4th Qtr 12/10/2019 9.75
1st Qtr 2/19/2020 10.1 205 lstQtr 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
4thQtr 12/10/2020 1.1 104
1st Qtr 2/23/2021 6.6 167
2ndQtr 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
2ndQtr 6/8/2022 1.4 128
3rd Qtr 8/30/2022 4.76 178
4th Qtr 11/30/2022 3.6 129
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
Chloride (mg/I)
NoGWQ5
NA
NA -------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 4th Quarter 2022
Nitrate Contamination Investigation
White Mesa Uranium Mill
TW4-21 (Pumping well starting In Parameter TW4-22 (Pumping well stating in Parameter June2015) August2005)
Sampling Event GWQS Sampling Event GWQS
Nitrate, Nitrate + Nitrite Chloride (mg/I) Nitrate, Nitrate + Nitrite
(10 mg/L) NoGWQS (10 mg/L)
Chloride (mg/I)
NoGWQS
1st Qtr 3/16/2005 was not sampled 1st Qtr 3/16/2005 was not sampled
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
4thQtr 12/7/2005 9.6 353 4th Qtr 12/7/2005
lstQtr 3/9/2006 8.5 347 1st Qtr 3/9/2006
2ndQtr 6/14/2006 10.2 318 2nd Qtr 6/14/2006
3rd Qtr 7/20/2006 8.9 357 3rd Qtr 7/20/2006
4thQtr 11/8/2006 8.7 296 4th Qtr 11/8/2006
1st Qtr 2/28/2007 8.7 306 1st Qtr 2/28/2007
2nd Qtr 6/27/2007 8.6 327 2nd Qtr 6/27/2007
3rd Qtr 8/15/2007 8.6 300 3rd Qtr 8/15/2007
4th Qtr 10/10/2007 8.3 288 4th Qtr 10/10/2007
1st Qtr 3/28/2008 14.3 331 lstQtr 3/28/2008
2nd Qtr 6/25/2008 8.8 271 2nd Qtr 6/25/2008
3rd Qtr 9/10/2008 7.57 244 3rdQtr 9/10/2008
4th Qtr 10/15/2008 8.0 284 4th Qtr 10/15/2008
1st Qtr 3/11/2009 8.3 279 lstQtr 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
14th Qtr _____ 12/22/200~ 8.4 256 4th Qtr 12/29/2009 ----------------------------------------------------------1st Qtr 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 10/15/201g 7.0 210 4th Qtr 10/15/2010 ----------------------------------------------------------1st Qtr 2/22/2011 9.0 303 lstQtr 2/22/2011
2nd Qtr 6/28/2011 12.0 290 2nd Qtr 6/1/2011
3rdQtr 8/17/2011 14.0 287 3rd Qtr 8/17/2011
4th Qtr 11/16/2011 13.0 287 4thQtr 11/16/2011
~l~t_9~ 1/19/2012 15.0 228 {i)lst Qtr 1/19/2012 ------------------i.... _______ ------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 !3ii'stQtr--2/11/2013
2ndQtr 6/18/2013 13.8 243 2nd Qtr 6/5/2013
3rd Qtr 9/13/2013 10.3 207 3rdQtr 9/3/2013
4thQtr 11/13/2013 9.0 206 4th Qtr 10/29/2013
lstQtr 2/5/2014 11.4 200 1st Qtr 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
1st Qtr 3/12/2015 10.9 255 1st Qtr 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 10/19/201~ 14.3 413 4th Qtr ______ _ 10/19/2015 ----------------------------------------1st Qtr 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
1st Qtr 3/8/2017 17.7 452 lstQtr 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
4th Qtr 10/11/2017 16.90 378 4th Qtr 10/11/2017
DWMRC split TW4-21 11.0 310 OWMRC split of TW4-22
1st Qtr 3/12/2018 15.8 447 lstQtr 3/12/2018
2nd Qtr 6/8/2018 14.1 387 2nd Qtr 6/8/2018
3rdQtr 8/22/2018 0.236 182 3rd Qtr 8/22/2018
4th Qtr 10/22/2018 15.2 378 4th Qtr 11/28/2018
1st Qtr 3/8/2019 9.0 180 lstQtr 3/8/2019
2nd Qtr 6/5/2019 17.5 456 2nd Qtr 6/5/2019
3rdQtr 9/4/2019 14.7 478 3rdQtr 9/4/2019
4th Qtr 12/10/2019 5.73 339 4th Qtr 12/10/2019
lstQtr 2/19/2020 8.9 446 lstQtr 2/19/2020
2ndQtr 5/27/2020 15.4 353 2nd Qtr 5/27/2020
3rd Qtr 9/4/2020 12.6 382 3rdQtr 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 3rd Qtr 8/24/2021
4th Qtr 12/1/2021 17.2 227 4th Qtr 12/1/2021
1st Qtr 3/9/2022 2.2 110 1st Qtr 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
4thQtr 11/30/2022 2.1 158 4th Qtr 11/30/2022
NA= not analyzed
(1) As of March 2012 both north and south wild life ponds no longer receiving water
(2) Chloroform pumping well started 6/9/15.
(3) Chloroform pumping well started 1126/13.
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
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 13C
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
54.6 598
47.2 614
41.5 540
54.9 596
69.2 675
47.1 390
64.7 557
56.1 567 ---------------------------------------------------------31.1 58,
58.4 59!
61.3 61'
61.5 58:
69.8 566
70.8 572
66.1 391
80.1 600
79.0 610
62.3 607
72.5 580
55.4 613
75.7 567
71.9 52
83.9 6€
72.5 58
59.9 5n
57.7 60
60.5 51
64.8 51
64.9 52
69.6 :~: 89.3
35.1 410
68.8 586
40.4 442
45.0 564
69.9 637
62.0 601
Table 14 of 16
Historic Nitrate, Nitrate+ Nitrite and Cloride Concentrations in Monitor Wells Up to the 4th Quarter 2022
Nitrate Contamination Investigation
White Mesa Uranium Mill
TW4•24(Pumping well starting in Parameter January2013)
Sampling Event GWQS
Nitrate, Nitrate + Nitrite Chloride (mg/I)
(10 mg/L) NoGWQS
2ndQtr 6/27/2007 26.1 770
3rd Qtr 8/15/2007 29 791
4thQtr 10/10/2007 24.7 692
1st Qtr 3/28/2008 24.4 740
2nd Qtr 6/25/2008 45.3 834
3rd Qtr 9/10/2008 38.4 1,180
4thQtr 10/15/2008 44.8 1,130
1st Qtr 3/4/2009 30.5 1,010
2nd Qtr 6/23/2009 30.4 759
3rdQtr 9/14/2009 30.7 618
4thQtr 12/16/2009 28.3 1,080
1st Qtr 2/25/2010 33.1 896
2nd Qtr 6/14/2010 30 639
3rdQtr 8/24/2010 31 587
4th Qtr 10/15/2010 31 522
1st Qtr 2/17/2011 31 1,100
2nd Qtr 5/26/2011 35 1,110
3rdQtr 8/17/2011 34 967
4th Qtr 11/16/2011 35 608
lstQtr 1/16/2012 37 373 ------------------L--------2nd Qtr 6/6/2012 37 355
3rdQtr 8/30/2012 37 489
4th Qtr 10/3/2012 38 405
lstQtr 2/11/2013 35.9 1,260 ------------------~-------2ndQtr 6/5/2013 23.7 916
3rd Qtr 8/30/2013 33 998
4thQtr 10/29/2013 35 1,030
lstQtr 1/27/2014 31.6 809
2ndQtr 5/19/2014 35.0 1,020
3rd Qtr 8/11/2014 31.5 1,150
4thQtr 10/21/2014 35.7 1,050
lstQtr 3/9/2015 34.6 944
2ndQtr 6/8/2015 31.8 1,290
3rd Qtr 8/31/2015 25.3 788
4thQtr 10/19/2015 29.6 909
1st Qtr 3/9/2016 29.1 989
2ndQtr 5/23/2016 24.2 771
3rd Qtr 7/25/2016 34.4 1,180
4thQtr 10/12/2016 31.9 1,010
1st Qtr 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 ofTW4-24 32.0 1,100
1st Qtr 3/16/2018 44.9 1,320
2nd Qtr 6/14/2018 33.6 792
3rd Qtr 8/22/2018 33.8 996
4thQtr 11/28/2018 38.4 1,100
1st Qtr 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
1st Qtr 2/19/2020 37.1 1,010
2nd Qtr 5/27/2020 41.7 1060
3rd Qtr 9/4/2020 39.1 1100
4th Qtr 10/28/2020 35.90 1050
1st Qtr 2/23/2021 41.9 1,170
2nd Qtr 6/9/2021 48.0 938
3rd Qtr 8/24/2021 26.7 1010
4thQtr 12/1/2021 43.60 1140
1st Qtr 3/9/2022 36.2 890
2nd Qtr 6/8/2022 35.0 944
3rd Qtr 8/30/2022 32.0 868
4th Qtr 11/30/2022 27.6 972
As of March 2012 both north and south wild life ponds no longer rece,v,ng water
Chloroform pumping well started January 2013
TW4-25 (Pumpins well stating in
January2013)
Sampling Event
2nd Qtr 6/27/2007
3rd Qtr 8/15/2007
4thQtr 10/10/2007
lstQtr 3/28/2008
2nd Qtr 6/25/2008
3rd Qtr 9/10/2008
4thQtr 10/15/2008
1st Qtr 3/4/2009
2nd Qtr 6/23/2009
3rdQtr 9/14/2009
4th Qtr 12/14/2009
lstQtr 2/23/2010
2nd Qtr 6/14/2010
3rd Qtr 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
lstQtr 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
3rd Qtr 9/4/2013
4th Qtr 10/31/2013
lstQtr 1/27/2014
2nd Qtr 5/19/2014
3rd Qtr 8/11/2014
4thQtr 10/21/2014
lstQtr 3/9/2015
2nd Qtr 6/8/2015
3rd Qtr 8/31/2015
4thQtr 10/19/2015
DWMRC split of TW4-25
1st Qtr 3/9/2016
2nd Qtr S/23/2016
3rd Qtr 7/25/2016
4thQtr 10/12/2016
1st Qtr 3/8/2017
2nd Qtr 6/13/2017
3rd Qtr 7/26/2017
4th Qtr 10/11/2017
1st Qtr 3/12/2018
2nd Qtr 6/14/2018
3rd Qtr 8/22/2018
4thQtr 11/28/2018
1st Qtr 3/8/2019
2nd Qtr 6/5/2019
3rdQtr 9/4/2019
4thQtr 12/10/2019
1st Qtr 2/19/2020
2nd Qtr 5/27/2020
3rd Qtr 9/4/2020
4thQtr 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
4th Qtr 11/30/2022
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
(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
1.47
Chloride (mg/I)
NoGWQS
395
382
358
374
344
333
366
332
328
328
371
296
306
250
312
315
321
276
294
304 -------287
334
3~!
19(
------:i36
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
67.2
Table 15 of 16
Historic Nitrate, Nitrate+ Nitrite and Cloride Concentrations in Monitor Wells Up to the 4th Quarter 2022
Nitrate Contamination Investigation
White Mesa Uranium Mill
TW4•37(Pumping well starting in Parameter June2015)
Sampling Event GWQS
Nitrate, Nitrate+ Nitrite Chloride (mg/I)
(10 mg/L) NoGWQS
2nd Qtr J 6/8/2015 35.2 345
!;~ 6:: _____ --1~~~!~~~~! 32.4 374
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
4th Qtr 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
4thQtr 10/11/2017 30.6 255
lstQtr 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 31.2 250
3rd Qtr 9/4/2019 25.8 228
4thQtr 12/10/2019 25.5 220
lstQtr 2/19/2020 28.3 236
2nd Qtr 5/27/2020 28.3 321
3rd Qtr 9/4/2020 29.5 273
4thQtr 10/28/2020 28.7 254
lstQtr 2/23/2021 26.9 242
2nd Qtr 6/9/2021 26.6 176
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
4thQtr 11/30/2022 30.9 578
Shaded = Nrtrate, Nitrate+ N1tnte concentrat,ons greater than the Ground Water Quality Standard of 10 mg/I
MW-30
Table 16 of 16
Historic Nitrate, Nitrate+ Nitrite and Cloride Concentrations in Monitor Wells Up to the 4th Quarter 2022
Nitrate Contamination Investigation
White Mesa Uranium Mill
Parameter MW-31 Parameter
Sampling Event GWQS Sampling Event GWQS
Nitrate, Nitrate + Nitrite Chloride (mg/I) Nitrate, Nitrate + Nitrite
(10 mg/L) NoGWQS (10 mg/L)
2nd Qtr 6/22/2005 12.4 125 2nd Qtr 6/22/2005 24.2
3rdQtr 9/22/2005 12.8 125 3rdQtr 9/22/2005 22.4
4th Qtr 12/14/2005 13.6 128 4th Qtr 12/14/2005 23.8
lstQtr 3/22/2006 13.8 125 lstQtr 3/22/2006 24.1
2nd Qtr 6/21/2006 14.5 124 2nd Qtr 6/21/2006 25.3
3rdQtr 9/13/2006 14.1 118 3rdQtr 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 lstQtr 3/15/2007 23.2
Chloride (mg/I)
NoGWQS
139
136
135
133
138
131
127
132
2nd Qtr 2007 not sampled 2nd Qtr 2007 not sampled
3rd Qtr 8/22/2007 14.6 126 3rdQtr 8/22/2007 23.3 136
4thQtr 10/24/2007 14.9 122 4thQtr 10/24/2007 24.6 122
lstQtr 3/19/2008 14.8 118 lstQtr 3/19/2008 25 124
2ndQtr 6/3/2008 18.7 125 2nd Qtr 6/3/2008 29.3 128
3rd Qtr 8/4/2008 17.3 121 3rd Qtr 8/4/2008 28.7 124
4thQtr 11/5/2008 15.6 162 4thQtr 11/5/2008 29.9 119
lstQtr 2/3/2009 15.3 113 1st Qtr 2/3/2009 23.4 115
2ndQtr 5/13/2009 15.1 122 2nd Qtr 5/13/2009 22.4 124
3rd Qtr 8/24/2009 20.9 118 3rd Qtr 8/24/2009 15.4 122
l4thQtr 10/14/2009 15.0 129 4thQtr 10/14/2009 22.6 138
lstQtr 2/9/2010 16.l 127 1st Qtr 2/9/2010 21.7 128
2ndQtr 4/27/2010 15.8 97 2nd Qtr 5/21/2010 23 128
3rd Qtr 9/14/2010 15.0 111 3rd Qtr 9/13/2010 21 139
4thQtr 12/14/2010 16.0 126 4thQtr 11/9/2010 20 138
1st Qtr 2/1/2011 16.0 134 1st Qtr 2/1/2011 21 145
2nd Qtr 6/20/2011 16.0 124 2nd Qtr 6/20/2011 22 145
3rd Qtr 9/7/2011 17.0 127 3rd Qtr 9/7/2011 21 148
4th Qtr 12/12/2011 16.0 124 4th Qtr 12/12/2011 21 148
1st Qtr 3/14/2012 18.0 128 lstQtr 3/13/2012 22 152
2nd Qtr 6/18/2012 15 131 2nd Qtr 6/18/2012 21.6 138
3rdQtr 9/19/2012 16 130 3rdQtr 9/18/2012 21 172
4th Qtr 12/26/2012 17.2 122 4th Qtr 12/18/2012 22.2 170
1st Qtr 2/26/2013 21.4 129 lstQtr 2/19/2013 19.3 174
2nd Qtr 5/15/2013 18.8 119 2nd Qtr 5/13/2013 23.8 169
3rdQtr 7/10/2013 17.6 130 3rdQtr 7/9/2013 21.7 182
4thQtr 11/20/2013 19.5 124 4th Qtr 11/18/2013 23 9 174
1st Qtr 2/25/2014 18.4 135 lstQtr 2/17/2014 20.6 197
2nd Qtr 6/3/2014 19.5 128 2nd Qtr 6/3/2014 23.1 173
3rdQtr 9/9/2014 16.8 139 3rdQtr 9/3/2014 18.9 210
4th Qtr 11/10/2014 16.2 154 4thQtr 11/4/2014 20.9 204
lstQtr 2/4/2015 14.9 136 lstQtr 2/2/2015 18.7 211
2nd Qtr 4/8/2015 17 142 2nd Qtr 4/7/2015 19 211
3rdQtr 8/11/2015 17.9 165 3rd Qtr 8/10/2015 19.9 264
4th Qtr 11/11/2015 16.3 140 4thQtr 11/9/2015 18.4 215
lstQtr 2/10/2016 20 145 lstQtr 2/10/2016 18.8 246
2nd Qtr 5/4/2016 17.3 139 2nd Qtr 5/3/2016 18.6 243
3rd Qtr 8/18/2016 18 150 3rd Qtr 8/16/2016 19.7 272
14th Qtr 11/3/2016 18 143 4thQtr 11/1/2016 19.8 267
1st Qtr 2/2/2017 17.4 150 lstQtr 2/7/2017 21.1 266
12nd Qtr 4/5/2017 18.3 146 2nd Qtr 5/1/2017 18.3 263
13rd Qtr 8/14/2017 19.2 173 3rd Qtr 8/14/2017 19.5 310
14th Qtr 11/1/2017 17.4 156 4thQtr 11/1/2017 19 292
lstQtr 2/22/2018 17.6 158 1st Qtr 2/20/2018 18.8 292
2ndQtr 4/12/2018 17.3 145 2nd Qtr 4/17/2018 19 308
3rd Qtr 9/11/2018 18 183 3rd Qtr 9/10/2018 20.1 333
4thQtr _____ --10/22/2018 17.2 140 4thQtr ______ __;9/24/2018 18.3 286 ----------------------------------------------------------------------------------lstQtr 2/13/2019 18.2 167 1st Qtr 2/12/2019 18.6 296
2nd Qtr 4/10/2019 18.S 138 2nd Qtr 4/10/2019 19.7 294
3rd Qtr 7/16/2019 19.3 181 3rd Qtr 7/16/2019 19.8 374
4thQtr 10/8/2019 18.2 170 4th Qtr 10/9/2019 19.8 318
lstQtr 1/15/2020 16.4 182 1st Qtr 1/15/2020 17.5 381
2nd Qtr 4/6/2020 18.1 195 2nd Qtr 4/6/2020 18.8 376
3rd Qtr 7/6/2020 18.4 185 3rd Qtr 7/7/2020 19.2 370
4th Qtr 12/8/2020 12 166 4thQtr 12/7/2020 18.8 311
lstQtr 3/8/2021 17 192 lstQtr 3/9/2021 17.4 388
2nd Qtr 4/14/2021 17.7 162 2nd Qtr 4/13/2021 18.6 377
3rd Qtr 7/29/2021 20.6 188 3rd Qtr 7/27/2021 18.7 391
4th Qtr 10/19/2021 14.3 182 4thQtr 10/19/2021 18.1 371
lstQtr 1/17/2022 14.S 181 1st Qtr 1/19/2022 18.0 370
2nd Qtr 4/20/2022 17.0 173 2nd Qtr 4/11/2022 18.0 372
3rd Qtr 7/12/2022 17.6 108 3rd Qtr 7/12/2022 16.9 421
4th Qtr 10/13/2022 17.9 195 4thQtr 10/11/2022 17 397
Shaded = Nitrate, Nitrate+ Nitrite concentrations greater than the Ground Water Quality Standard of 10 mg/1
Table 2
Summary of QA/QC Duplicate Sample
4th Quarter 2022
Parameter GWQS Duplicate of TWN-20
TWN-20 TWN-65
Nitrate + Nitrite (as N) 10 mg/L 0.446
Chloride none 32.0
High lighted exceeding PRO (Rel1tve % difference) of 20%
NA= Not Analyzed
0.405
32 .0
RPO
9.6
0.0
Data Discrlptions
MW4 MW-26 TW4-1
Nitrate (mg/L) . 4.05 t-i~r!lte (9/~f ...... . ........ 4.0SE-03
f'JitrajEl(lbs/~L 8.95E-06
N.~r11tEl (l~s,/gal) .. ..................... ... ..... ....... 3.39E-05
0.337 .... 3.62
3.37E-04 3.62E-03 1.<1sE~ci1 8.00E-06 2.s2E:as 3.03E-05
!C>t11i g11llc,115,Jllllllf>El~ ......... ~1 :"~!c41····· 2~:'11.1 ... :".,............. 8450.8
lbs of nit~f~ir:ieo~~oved ... .. ...... ... . . . ......... }½~ ..... ·········· ri'.ri~ .... . ri:~~
lbs nitrate removed from all pumping wells
lbs nitrate removed from nitrate pumping wells
TW4-2
3.74
Tabel3
DWMRC Nitrate Mass Removal Calculations
Energy Fuels Resorses Inc. White Mesa Mill, Bland, Utah
4th Quarter 2022
Chloroform Pum_j>l_rlg_ Wells
TW4-4 I TW4-11 I TW4-19 I TW4-21 TW4-37
3.580 30.9 6.591 7.051 -·---, -··-i .. -----·-,
3. 7 4E-03 j ~'~~.1::.0..3..~ ···························· 1.46E-05 8.26E-06
3.13E-05
12148.6
0.38
0.03
7.05E-03
1.56E-05
3.58E-03
7.91E-06
2.12E-03
4.68E-06
3.09E-02 s.a3E:os s:s1E:os
8777.0
ii:48 a:a.i
63.17
38
5.90E-05
1442.4
0.09
0.01
2.99E-05 1.77E-05 2.58E-04
137474.5
4.12
0.33
9,i,ir~!l ·· 43~!~;
Nitrate Pumping Wells
TW4-39 TW4-40 TW4-41 TWN-2 I TW4-22 I TW4-24 I TW4-25
7.86
7.86E-03
1.74E-05
6.57E-05 . r~!~ ~ :mt :~i mi: E mi: .. tl!!;i
27.6 1.47
3,9T~~I "~2:60~ 11722.6
9,591 0.05
15,606.0
1.83
0.15
22398.4 100289.8 95056.0 ~-··· ...... 11.61 23.15
0.94 1.88
1.17
0.10