DRC-2022-021182 - 0901a068810eae8d

Department of
Environmental Quality
Kimberly D. Shelley
Executive Director State of Utah
SPENCER J. COX
Governor
DIVISION OF WASTE MANAGEMENT
AND RADIATION CONTROL
DEIDRE HENDERSON
lieutenant Governor
Douglas J. Hansen
Director
TO:
FROM:
DATE:
SUBJECT:
MEMORANDUM
Phil Goble P/2.'
Dean Henderson
July 29, 2022
Review of the May 3, 2022 1st Quarter 2022 Nitrate Monitoring Report 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
May 3, 2022, 1st 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 1st quarter Nitrate Monitoring Report for the Nitrate Contamination Investigation
to be submitted to Division on or before June 1, of each year. The Report was received by the Division
on May 9, 2022 (date of Report May 3, 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 I 950 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.utah.gou
Printed on 100% recycled paper
DRC-2022-021182
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 1st 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,.J, 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.
Page3
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 55 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 55 lbs. removed, approximately 33 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
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 IO 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 1st 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 1st Quarter, 2022 Nitrate Monitoring
Report, May 3, 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 1st Quarter 2022
Nitrate Contamination Investigation
White Mesa Uranium Mill
TWN-1 Parameter TWN-2 (Pumpin& well starting !n Parameter January2013)
Sampling Event GWQS Sampling Event GWQS
Nitrate, Nitrate+ Nitrite Chloride (mg/I) Nitrate, Nitrate+ Nitrite
(10 mg/L) NoGWQS (10 mg/L)
1st Qtr 3/17/2010 0.50 17 1st Qtr 3/24/2010 62
2nd Qtr 5/26/2010 0.6 20 2nd Qtr 6/2/2010 69
3rdQtr 9/27/2010 0.6 19 3rd Qtr 9/29/2010 69
4th Qtr 12/7/2010 0.6 14 4th Qtr 12/9/2010 48
1st Qtr 1/26/2011 0.5 17 1st Qtr 2/1/2011 . 43
2nd Qtr 4/20/2011 0.5 19 2nd Qtr 4/28/2011 40
3rdQtr 7/26/2011 0.5 14 3rd Qtr 7/28/2011 33
4th Qtr 10/17/2011 0.5 10 4th Qtr 10/20/2011 33
1st Qtr 1/9/2012 0.6 15 1st Qtr 1/12/2012 31
2nd Qtr 4/18/2012 0.6 17 2nd Qtr 4/20/2012 48
3;-;ioi~---ii24 /201 2 ----------004f ____ 1/: 3rdQtr--l-7 .13iiiiiii ------------54
4th Qtr 10/17/2012 4th Qtr 7/17/2012 22.1
l stQtr --iilB/2013 --------------------lst-Qtr--I-"'iii§'iiiii3 ------------0.68 17.6
2nd Qtr 4/23/2013 0.84 17.4 2nd Qtr 4/24/2013
3rdQtr 8/27/2013 1.24 24.1 3rd Qtr 8/27/2013
4th Qtr 10/16/2013 1.61 26.8 4thQtr 7/16/2013
TWN-65 duplicat ofTWN-1 1.48 27.1 DRC split of TWN-2
ORC split of TWN-1 1.6 30
DRC duplicate of TWN-1 0.22 30
1st Qtr
I
1/14/2014 1.47 29.2 lstQtr 1/13/2014
2nd Qtr 5/6/2014 1.63 31.1 2nd Qtr 5/7/2014
3rdQtr 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 4thQtr 10/8/2014
1st Qtr I 2/18/2015 1.37 27.8 lstQtr 2/18/2015
TWN-65 dup of TWN-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
4th Qtr 10/13/2015 1.35 27.7 4thQtr 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
lstQtr 2/15/2017 2.06 31.2 1st Qtr 2/15/2017
TWN-65 duplicate of TWN-1 1.98 31.5
2nd Qtr I 6/1/2017 1.89 32.7 2nd Qtr I 6/112017 I
TWN-65 duplicate ofTWN-1 1.88 31.S
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
4thQtr I 10/4/2017 1.95 30.8 4th Qtr I 10/4/20171
TWN-65. duplicate of TWN-1 1.99 32.0 .............. ········•·· 1st Qtr 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 ........ ········· 1st Qtr 2/20/2019 2.1 31.4 1st Qtr 2/20/2019
2nd Qtr 5/29/2019 1.93 32.6 2nd Qtr 5/29/2019
3rdQtr 8/14/2019 2.15 30.3 3rd Qtr 8/14/2019
4th Qtr 10/16/2019 2.35 32.0 4th Qtr 10/16/2019
DWMRCsplitofTWN-1 2.1 31.0 DWMRC split of TWN-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
4th Qtr 11/12/2020 1.89 29.2 4th Qtr 11/12/2020
1st Qtr 2/17/2021 2.53 34.1 1st Qtr 2/18/2021
2nd Qtr 5/25/2021 3.18 34.7 2nd Qtr 5/25/2021
3rdQtr 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 2/15/2022
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 rece,v,ng water
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
250J
23.9 I
31.9 1
19.6
19.8
18.6
19.6
19.0
45.1
23.2
18.2
16.0
16.S
16.1
17.2
12
15.4
13.8
15.3
12.7
15.3
Chloride (mg/I)
NoGWQS
85
97
104
93
93
85
74
76
86
103
------93
79
-----8Q5
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.S
56
50.7
102
50.7
53
52
66.1
59.6
55.6
53.S
61.8
61.5
58.9
62.3
59.5
Table 2 of 16
Historic Nitrate, Nitrate+ Nitrite and Cloride Concentrations in Monitor Wells Up to the 1st 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
lstQtr 3/25/2010 25.3 111 1st Qtr 3/16/2010
2nd Qtr 6/3/2010 26 118 2nd Qtr 5/27/2010
3rdQtr 7/16/2010 27 106 3rd Qtr 9/27/2010
~.t.hQtr 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
4th 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 4/18/2012 -------------------------------TWN-65 duplicate of TWN-4
3rd Qtr 7/31/2012 27 158 3rdQtr I 7/25/2012
TWN-65 duplicate of TWN-4
4th Qtr 10/17/2012 12.1 149 4th Qtr __ t 7/15/2012
1:aot;----'[il<J/201 3 --------------------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
3rd Qtr 8/28/2013 20.9 171 3rd Qtr 8/27/2013
TWN-65 duplicate of TWN-4
4thQtr 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 J 1/14/2014
TWN-65 duplicate of TWN-4
2nd Qtr 5/7/2014 23.6 168 2nd Qtr I 5/6/2014
TWN-65 duplicate of TWN-4
3rd Qtr 8/6/2014 19.5 174 3rd Qtr 8/5/2014
4thQtr 10/9/2014 19.1 153 4thQtr 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
3rdQtr 8/26/2015 16.2 156 3rd Qtr 8/25/2015
TWN-65 duplicate ofTWN-4
4thQtr 10/14/2015 16.3 129 4th Qtr I 10/13/2015
TWN-65_ duplicate of TWN-4
lstQtr 2/24/2016 16.8 128 1st Qtr 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
4thQtr 10/7/2016 15.8 113 ~\h Qtr 10/6/2016
1st Qtr 2/16/2017 17.4 113 1st Qtr 2/15/2or'i
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
4thQtr 10/4/2017 15.6 111 4th Qtr 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 ofTWN-4
4thQtr 11/21/2018 J 201J 123 4th Qtr I 1112012018
........ TWN-~~ duplicate of TWN-4
1st Qtr 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 4th Qtr 10/16/2019
DWMRC split ofTWN-3 17.0 130 TWN-65 duplicate of TWN-4
DWMRC split of TWN-4
TW4-40 DWMRC duplicate of TWN
4
1st Qtr I 1/30/20201 19.41 156 1st Qtr 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 7/15/20201 22.21 130 3rdQtr I 7/15/2020
TWN-65 duplicate of TWN-4
4th Qtr '""''"'"!-:: 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 3rdQtr 8/18/2021
4th 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
Shaded= Nitrate, Nitrate+ Nitrite 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
Chloride (mg/I)
NoGWQS
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
29.6
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
Table 3 of 16
Historic Nitrate, Nitrate+ Nitrite and Cloride Concentrations in Monitor Wells Up to the 1st Quarter 2022
Nitrate Contamination Investigation
White Mesa Uranium Mill
TWN-5 Parameter TWN-6 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 3/16/2010 0.3 43 1st Qtr 3/23/2010 1.5
2nd Qtr 5/26/2010 0.3 44 2nd Qtr 6/1/2010 1.4
3rd Qtr 7/12/2010 0.3 43 3rd Qtr 7/13/2010 1.4
4th Qtr 12/7/2010 0.3 45 4th Qtr 12/7/2010 1.2
1st Qtr 1/25/2011 0.4 47 1st Qtr 1/26/2011 1.1
2nd Qtr 4/20/2011 0.3 44 2nd Qtr 4/20/2011 1.5
3rd Qtr 7/26/2011 0.3 44 3rd Qtr 7/27/2011 1.1
4th Qtr 10/17/2011 0.3 45 4th Qtr 10/18/2011 1.4
1st Qtr 1/9/2012 0.2 45 1st Qtr 1/10/2012 1.2
2nd Qtr 4/18/2012 0.3 39 2nd Qtr 4/18/2012 1.1
3rd Qtr 7/24/2012 0.3 48 3rd Qtr 7/25/2012 1.4
4th Qtr 10/15/2012 <0.1 43.5 4th Qtr 7/15/2012 0.78
1st Qtr 2013 NA 1st Qtr 2013 NA
2nd Qtr 2013 NA 2nd Qtr 2013 NA
TWN-5 abandoned on July 31, 2013 3rd Qtr 2013 NA
4th Qtr 2013 NA
1st Qtr 2014 NA
2nd Qtr 2014 NA
3rd Qtr 2014 NA
4th Qtr 2014 NA
1st Qtr 2015 NA
2nd Qtr 2015 NA
3rd Qtr 2015 NA
4th Qtr 2015 NA
1st Qtr 2016 NA
2nd Qtr 2016 NA
3rd Qtr 2016 NA
4th Qtr 2016 NA
1st Qtr 2017 NA
2nd Qtr 2017 NA
3rd Qtr 2017 NA
4th Qtr 2017 NA
1st Qtr 2018 NA
2nd Qtr 2018 NA
3rd Qtr 2018 NA
4th Qtr 2018 NA
1st Qtr 2019 NA
2nd Qtr 2019 NA
3rd Qtr 2019 NA
4th Qtr 2019 NA
1st Qtr 2020 NA
2nd Qtr 2020 NA
3rd Qtr 2020 NA ...
4th Qtr 2020 NA
lstQtr 2021 NA
2nd Qtr 2021 NA
3rd Qtr 2021 NA
4th Qtr 2020 NA
1st Qtr 2022 NA
NA= Per the CAP and SCO, not sampled
Chloride (mg/I)
NoGWQS
19
22
73
21
18
22
17
21
20
22
22
20.4
Table 4 of 16
Historic Nitrate, Nitrate+ Nitrite and Cloride Concentrations in Monitor Wells Up to the 1st Quarter 2022
Nitrate Contamination Investigation
White Mesa Uranium Mill
TWN-7 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)
1st Qtr 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
l4th.Otr. .......... 12/10/2010 1 4 4th Qtr 12/7/2010 <0.1
1st Qtr 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
3rdQtr 7/29/2011 0.7 5 3rd Qtr 7/26/2011 <0.1
4th.Otr 10/19/2011 2.2 6 4th Qtr 10/17/2011 <0.1
1st Qtr 1/11/2012 2.3 5 1st Qtr 1/9/2012 <0.1
2nd Qtr 4/20/2012 1.2 6 2nd Qtr j~~~g <0.1
-ii2G/2 01 2 ----------o0G! 1-----5~~ 3rcfo"ir--~-----------3rdQtr 7/24/2012 <0.1
4th Qtr 10/16/2012 4th Qtr 10/15/2012 <0.1
-iii9/201 3 -----------------------------1------------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
1st Qtr 1/15/2014 0.882 5.75
2nd Qtr 5/7/2014 0.564 5.26
3rd Qtr 8/6/2014 0.9 6
4th.Otr ..... 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
1st Qtr 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
4thQtr 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
3rdQtr 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
4thQtr 11/21/2018 11.S 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
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
~t~q~r .... 11/13/2020 11.8 121 ......
1st Qtr 2/18/2021 16.0 129
2nd Qtr 5/27/2021 16.4 129
3rdQtr 8/19/2021 15.1 121
4th Qtr 11/24/2020 7.66 130
1st Qtr 2/17/2022 16.9 120
Shaded= Nitrate, Nitrate+ Nitrite concentrat1ons 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 rece1v1ng water
Chloride (mg/I)
NoGWQS
11
11
11
9
13
10
18
10
11
15 -------11
11.1 -------
Table 5 of 16
Historic Nitrate, Nitrate+ Nitrite and Cloride Concentrations in Monitor Wells Up to the 1st 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)
1st Qtr 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 ....... . ........................................
1st Qtr 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 110 208 3rd Qtr 7/27/2011 0.1
4th Qtr 10/20/2011 10.9 134 4th Qtr 10/18/2011 0.2 ........ ......... .......... . .................
lstQtr 1/12/2012 12.2 202 1st Qtr 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
3rdQtr 7/31/2012 12.3 215 3rd Qtr 7/25/2012 0.6
4th_Qtr .... 10/17/2012 12.5 194 4th Qtr ..... 7/16/2012 0.12
lstQtr 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 ......................................... ..........
1st Qtr 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
3rdQtr 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 ....... . 1/10/2012 . 1st Qtr 1/10/2012 1.6 69 1st Qtr 0.9
ate ofTWN-11 1.6 70
2nd Qtr j 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
4th_Qtr_ .. 10/16/2012 1.84 76.4 4th Qtr 7/16/201? .. 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 Ju ly 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
Table 6 of 16
Historic Nitrate, Nitrate + Nitrite and Cloride Concentrations in Monitor Wells Up to the 1st Quarter 2022
Nitrate Contamination Investigation
White Mesa Uranium Mill
TWN-13 Parameter TWN-14 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 3/17/2010 <0.1 47 1st Qtr 3/24/2010 2.9
2nd Qtr 5/26/2010 0.1 49 2nd Qtr 6/2/2010 2.9
3rdQtr 9/27/2010 0.2 53 3rd Qtr 7/15/2010 3.5
4th Qtr 12/7/2010 0.4 57 4th Qtr 12/10/2010 4.2
1st Qtr 1/25/2011 1.6 103 1st Qtr 1/28/2011 3.7
2nd Qtr 4/26/2011 <0.1 49 2nd Qtr 4/27/2011 3.5
3rd Qtr 7/26/2011 0.1 49 3rd Qtr 7/29/2011 3.5
4th Qtr 10/17/2011 <0.1 48 4th Qtr 10/19/2011 3.9
1st Qtr 1/9/2012 <0.1 46 1st Qtr 1/11/2012 3.5
2nd Qtr 4/18/2012 <0.1 53 2nd Qtr 4/20/2012 3.4
3rd Qtr 7/24/2012 0.1 48 3rd Qtr 7/27/2012 3.7
TW4--70 duplicate ofTWN-14 3.8
4th Qtr 10/15/2012 <0.1 47.3 4th Qtr 7/17/2012 4.03
1st Qtr I 2013 NA 1st Qtr 2013 NA
2nd Qtr 2013 NA 2nd Qtr 2013 NA
TWN-13 abandoned on July 31, 2013 3rd Qtr 2013 NA
4th Qtr 2013 NA
1st Qtr 2014 NA
2nd Qtr 2014 NA
3rd Qtr 2014 NA
4th Qtr 2014 NA
1st Qtr 2015 NA ..
2nd Qtr 2015 NA
3rd Qtr 2015 NA
4th Qtr 2015 NA
1st Qtr 2016 NA
2nd Qtr 2016 NA
3rd Qtr 2016 NA
4th Qtr 2016 NA
1st Qtr 2017 NA
2nd Qtr 2017 NA
3rd Qtr 2017 NA
4th Qtr 2017 NA
1st Qtr 2018 NA
2nd Qtr 2018 NA
3rd Qtr 2018 NA
4th Qtr 2018 NA
1st Qtr 2019 NA
2nd Qtr 2019 NA
3rd Qtr 2019 NA
4th Qtr 2019 NA
1st Qtr 2020 NA
2nd Qtr 2020 NA
3rd Qtr 2020 NA
4th Qtr 2020 NA
1st Qtr 2021 NA
2nd Qtr 2021 NA
3rd Qtr 2021 NA
4th Qtr 2021 NA
1st Qtr 2022 NA
NA= Per the CAP and SCO, not sampled
Chloride (mg/I)
NoGWQS
24
30
26
28
24
30
25
27
26
27
27
27
27.4
Table 7 of 16
Historic Nitrate, Nitrate + Nitrite and Cloride Concentrations in Monitor Wells Up to the 1st Quarter 2022
Nitrate Contamination Investigation
White Mesa Uranium Mill
TWN-15 Parameter TWN-16 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 3/18/2010 0.7 43 1st Qtr 3/17/2010 1.2
2nd Qtr 5h8/2oio 1.0 39 2nd Qtr 5/27/2010 1.3
3rd Qtr 7/13/2010 I 1.0 36 3rd Qtr 9/27/2010 2.6
4th Qtr 12/9/2010 1.2 38 4th Qtr 12/9/2010 2
1st Qtr 1/27/2011 1.4 43 1st Qtr 1/27/2011 4.6
2nd Qtr 4/27/2011 1.6 49 2nd Qtr 4/27/2011 1.6
3rd Qtr 7/28/2011 1.6 47 3rd Qtr 7/27/2011 2.4
4th Qtr 10/19/2011 1.3 38 4th Qtr 10/18/2011 2.6
1st Qtr 1/11/2012 1.5 38 1st Qtr 1/10/2012 2.8
2nd Qtr 4/20/2012 1.6 46 2nd Qtr 4/19/2012 2.0
TW4-70 duplicate ofTWN-15 1.7 46
3rd Qtr I 7/26/2012 2.1 50 3rd Qtr 7/25/2012 2.4
4th Qtr 10/17/2012 1.79 47 4th Qtr 7/16/2012 2.50
TW4-70 duplicate of TWN-15 2.0 44.4
1st Qtr 2013 NA 1st Qtr 2013 NA
2nd Qtr 2013 NA 2nd Qtr 2013 NA
TWN-15 abandoned on July 31, 2013 3rd Qtr 2013 NA
4th Qtr 2013 NA
1st Qtr 2014 NA
2nd Qtr 2014 NA
3rd Qtr 2014 NA
4th Qtr 2014 NA
1st Qtr 2015 NA
2nd Qtr 2015 NA
3rd Qtr 2015 NA
4th Qtr 2015 NA
1st Qtr 2016 NA
2nd Qtr 2016 NA
3rd Qtr 2016 NA
4th Qtr 2016 NA
lstQtr 2017 NA
2nd Qtr 2017 NA
3rd Qtr 2017 NA
4th Qtr 2017 NA
1st Qtr 2018 NA
2nd Qtr 2018 NA
3rd Qtr 2018 NA
4th Qtr 2018 NA
.1st Qtr 2019 NA
2nd Qtr 2019 NA
3rd Qtr 2019 NA
4th Qtr 2019 NA
1st Qtr 2020 NA
2nd Qtr 2020 NA
3rd Qtr 2020 NA
4th Qtr 2020 NA
1st Qtr 2021 NA
2nd Qtr 2021 NA
3rdQtr 2021 NA
4th Qtr 2021 NA
1st Qtr 2022 NA
NA= Per the CAP and SCO, not sampled
Chloride (mg/I)
NoGWQS
35 -SHSID->>>
35
35
30
34
39
31
34
33
50
33
32.1
Table 8 of 16
Historic Nitrate, Nitrate+ Nitrite and Cloride Concentrations in Monitor Wells Up to the 1st Quarter 2022
Nitrate Contamination Investigation
White Mesa Uranium Mill
TWN-17
Sampling Event
Parameter
GWQS
TWN-18
Sampling Event
Parameter
GWQS
lstQtr
2nd Qtr
3rdQtr
4thQtr
1st Qtr
2nd Qtr
3rd Qtr
4th Qtr
1st Qtr
2nd Qtr
3rdQtr
4thQtr
lstQtr
2nd Qtr
Nitrate, Nitrate+ Nitrite
(10 mg/L)
Chloride (mg/I)
NoGWQS
Nitrate, Nitrate + Nitrite
(10 mg/L)
Chloride (mg/I)
NoGWQS
3/24/2010 10.4 78 1st Qtr 3/17/2010 1.6 42
6/3/2010 ~---11 87 2nd Qtr 6/1/2010 1.8 63
7/15/2010 8.9 66 3rd Qtr 9/27/2010 1.8 64
12/10/2010 8 65 4th Qtr 12/9/2010 1.6 59
2/1/2011 8.6 90 1st Qtr 1/27/2011 1.4 61
4/28/2011 9 81 2nd Qtr 4/26/2011 1.8 67
7/29/2011 8.5 74 3rd Qtr 7/28/2011 1.8 65
10/20/2011 8.1 71 4th Qtr 10/18/2011 1.9 60
1/12/2012 8. 7 79 1st Qtr 1/10/2012 1.9 64
4/20/2012 9.1 80 2nd Qtr 4/19/2012 2.1 64
-7/27/2012 ----------9.5,-----85 3rd Qt,--'" 7/26/2012 ----------· B ------67
10/17/2012 9.65 84.8 4th Qtr 7/16/2012 1.95 67.5 ------------------------------i-------------------------2013 NA 1st Qtr 2/18/2013 2.27 68. 7
2013 NA 2nd Qtr 4/23/2013
TW4-65 dup of TWN-18
2.32
2.46
64.3
66.1
, .. 3_r_d_Q_tr_~ ___ 20_1_3~NA ______________ -<3rd Qtr I 8/27/2013
TWN-17 abandoned on July 31, 2013 4th Qtr 10/16/2013
2.04 70.4
2.15 67.3
DRC. split sample....--,--,---t---
lst Qtr 2/14/2014
0.29
2.33
2nd Qtr 5/6/2014 2.18
3rd Qtr 8/5/2014 1.8
4th Qtr 10/8/2014 1.47
TW4-65 dup of TWN-18 1.47
1st Qtr I 2/18/2015
2nd Qtr 5/13/2015
1
1.35
TW4-65 dup ofTWN-18 <0.10
3rd Qtr I 8/25/2015
4th Qtr 10/13/2015
0.35
0.668
TW4-65 dup ofTWN-18 0.645 ····················· 1st Qtr 2/23/2016 0.648
2nd Qtr 5/17/2016 0.497
3rd Qtr 7/21/2016 <0.100
4th Qtr 10/6/20_1_,6 >--------0.501 ............
1st Qtr 2/15/2017 0.47
2nd Qtr 6/1/2017 0.392
3rd Qtr 7/19/2017 0.419
4th Qtr 10/4/2_0_17-+----------f
1st Qtr 1/18/2018
0.256 ..........
0.332
2nd Qtr 5/8/2018 0.283
3rd Qtr 8/8/2018 0.348
0.16 4th_ Qtr 11/_2~1/~2_0_18-+----------+--
lst Qtr 2/20/2019 0.155
TWN-65 dup of TWN-18 0.174
2nd Qtr I 5/29/2019 0.129
TWN-65 dup ofTWN-18 0.152
3rd Qtr I 8/14/2019 0.181
TWN-65 dup ofTWN-18 0.184
4th Qtr I 10/16/2019 0.162
DWMRC duplicate of TWN-18 0.13 1s1·01; · r 112912020 · 0.224
TWN-65 dup oflWN-18 0.249
2nd Qtr I 5/20/2020
3rd Qtr 7/15/2020
4th Qtr 11/12/2020
0.223
0.232
0.208
TWN-65 dup ofTW....-N_•l~B ~--+----------1---
lst Qtr I 2/17/2021
0.171
0.228
TWN-65 dup ofTWN-18 0.227
2nd Qtr I 5/25/2021 0.22
TWN-65 dup of TWN-18 0.247
3rd Qtr I 8/17/2021 0.199
TWN-65 dup ofTWN-18 0.208
4th Qtr I 11/23/2021 0.245 ......................
1st Qtr I 2/15/2022 0.199
TWN-65 dup ofTWN-18 <0.1
NA= Per the CAP and SCO, not sampled
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 __ _
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
Table 9 of 16
Historic Nitrate, Nitrate+ Nitrite and Cloride Concentrations in Monitor Wells Up to the 1st Quarter 2022
Nitrate Contamination Investigation
White Mesa Uranium Mill
TWN-19 Parameter Upper Wildlife Pond 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 3/23/2010 7.2 118 1st Qtr 3/18/2010 <0.1
2nd Qtr 6/1/2010 6.2 113 2nd Qtr 6/2/2010 <0.1
3rd Qtr 9/27/2010 7.2 113 3rd Qtr 7/19/2010 <0.1
4th Qtr 12/9/2010 7.0 107 4th Qtr 12/10/2010 <0.1
1st Qtr 2/1/2011 7.0 114 1st Qtr 1/31/2011 0.1
2nd Qtr 4/28/2011 6.9 120 2nd Qtr 4/25/2011 <0.1
3rd Qtr 7/28/2011 7.1 113 3rd Qtr 7/25/2011 <0.1
4th Qtr 10/18/2011 6.5 108 4th Qtr 10/19/2011 <0.1
1st Qtr 1/10/2012 7.0 114 1st Qtr 1/31/2012 0.1
2nd Qtr .. 4/19/2012 6.8 117 Pond no longer in service
3rd Qtr 7/26/2012 7.5 117
4th Qtr 10/16/2012 7.7 118
1st Qtr 2013 NA
2nd Qtr 2013 NA
3rd Qtr 2013 NA
4th Qtr 2013 NA
1st Qtr 2014 NA
2nd Qtr 2014 NA
3rd Qtr 2014 NA ........
4th Qtr 2014 NA
1st Qtr 2015 NA
2nd Qtr 2015 NA
3rd Qtr 2015 NA
4th Qtr 2015 NA
1st Qtr 2016 NA
2nd Qtr 2016 NA
3rd Qtr 2016 NA
4th Qtr 2016 NA
1st Qtr 2017 NA
2nd Qtr 2017 NA
3rd Qtr 2017 NA
4th Qtr 2017 NA
1st Qtr 2018 NA
2nd Qtr 2018 NA
3rd Qtr 2018 NA
4th Qtr 2018 NA
1st Qtr 2019 NA
2nd Qtr 2019 NA
3rd Qtr 2019 NA
4th Qtr 2019 NA
1st Qtr 2020 NA ........ 2nd Qtr 2020 NA
3rd Qtr 2020 NA .....
4th Qtr 2020 NA
1st Qtr 2021 NA
2nd Qtr 2021 NA
3rd Qtr 2021 NA
4th Qtr 2021 NA
1st Qtr 2022 NA
TWN-20 Parameter TWN-21 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 6/3/2021 1.88 50 2nd Qtr 6/3/2021 1.03
8/19/2021 3rd Qtr
..
8/19/2021 1.16 3rd Qtr 0.96 35.3
4th Qtr 11/23/2021 0.286 33.6 4th Qtr 11/23/2021 0.696
1st Qtr 2/16/2022 0.436 31.2 1st Qtr 2/16/2022 1.1
NA= Per the CAP and SCO, not sampled
Chloride (mg/I)
NoGWQS
<1.0
<1.0
<1.0
1
1
<1.0
<1.0
<1.0
1
Chloride (mg/I)
NoGWQS
41.9
40.S
42.6
40.4
Table 10 of 16
Historic Nitrate, Nitrate+ Nitrite and Cloride Concentrations in Monitor Wells Up to the 1st 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
1/31/2011
................................. .......... 1st Qtr 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
1Ji1ho12. .......... lstQtr 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 58 2nd Qtr 4/20/2012 0.2
3;;iot-;---ii21 /201 2 ----------/6~1-----1~ ~dQtr--'""1nii20ii ------------0.2
4th Qtr 10/17/2012 4th Qtr 7/17/2012 0.19 -----i'h9/201 3 ------------------■ -----'""2ii§i20u -----------■ 1st Qtr 8.11 56.7 1st Qtr 0.22
2nd Qtr 4/24/2013 8.88 53.3 2nd Qtr 4/24/2013 0.172
3rdQtr 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
1st Qtr 1/13/2014 6.79 56.2 1st Qtr 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
4th_Qtr 10/8/2014 5.75 57.6 4th Qtr 10/8/2014 0.755 ....... 2/18/2015 . 2/18/2015 ... 1st Qtr 6.41 55.9 1st Qtr 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
4thQtr 10/14/2015 6.17 54.4 4th Qtr 10/14/2015 0.692
1st Qtr 2/23/2016 8.31 56.5 1st Qtr 2/23/2016 0.615
2nd Qtr 5/12/2016 6.33 59.1 2nd Qtr 5/12/2016 0.665
3rdQtr 7/19/2016 6.78 53.9 3rd Qtr 7/19/2016 0.669
4th Qtr 10/11/2016 6.42 58.1 4th Qtr 10/11/2016 0.732
1st Qtr iJishoii -· 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
~t.~ Qtr 10/4/2017 6.21 54.4 4th Qtr 10/4/2017 0.684
iJiiho1a · ...... .................... lstQtr 6.35 55.3 1st Qtr 1/17/2018 0.716
2nd Qtr 5/9/2018 6.56 58 2nd Qtr 5/9/2018 0.776
3rd Qtr 8/8/2018 6.66 63.5 3rd Qtr 8/8/2018 0.818
~t.~ Qtr 11/21/2018 6.7 55.5 4th Qtr 11/20/2018 0.648
2/19/2019. ...... 2/19/2019 . ..............................................
1st Qtr 6.72 56.8 1st Qtr 0.599
2nd Qtr 5/30/2019 6.75 59.4 2nd Qtr 5/30/2019 0.702
3rd Qtr 8/14/2019 6.81 61.1 3rd Qtr 8/14/2019 0.606
4thQtr 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
isi Qtr 1/30/2020 . 7.12 68.9 1st Qtr 1/30/2020 0.740
2nd Qtr 5/20/2020 6.95 67.7 2nd Qtr 5/20/2020 0.679
3rd Qtr 7/15/2020 7.36 63.6 3rdQtr 7/15/2020 0.793
~t.hQtr 11/13/2020 7.51 63.9 4th_Qtr 11/13/2020 0.544 ......................................... .......... ·2Jiaho21 · lstQtr 2/18/2021 7.34 57.S 1st Qtr 0.401
2nd Qtr 5/27/2021 7.89 69.9 2nd Qtr 5/27/2021 <0.1
3rd Qtr 8/19/2021 7.6 70 3rd Qtr 8/19/2021 0.11
~-t-~ Qtr 11/23/2021 4.69 65.S 4th Qtr 11/23/2021 <0.1 .......... lstQtr 2/16/2022 7.4 68.8 1st Qtr 2/16/2022 0.330
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 ···················•··••.o••········· 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[
Table 11 of 16
Historic Nitrate, Nitrate+ Nitrite and Cloride Concentrations in Monitor Wells Up to the 1st 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
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
3;-;io t-;---ii21 /201 2 ----------/;f ____ 21.~
4th Qtr 10/17/2012
-ih4/2013 ------------------■ 1st Qtr 1.85 21
2nd Qtr 4/24/2013 1.83 21.2
3rdQtr 8/28/2013 1.81 22.4
4th Qtr 10/16/2013 1.8 23.S
ORC split sample 0.33 27
1st Qtr . ijijjiiii4 . . 1.7 26
2nd Qtr 5/7/2014 1.79 23.9
3rd Qtr 8/6/2014 1.7 26
4th Qtr 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
4th Qtr 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
1st Qtr 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 .......... iJiihoig · lstQtr
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
1st Qtr 2/16/2022
l. New piezometer PIEZ-3A to replace PIEZ-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/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
10.1 124
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
10.S 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
Table 12 of 16
Historic Nitrate, Nitrate+ Nitrite and Cloride Concentrations in Monitor Wells Up to the 1st Quarter 2022
Nitrate Contamination Investigation
White Mesa Uranium Mill
TW4-19{Pumping well starting in Parameter TW4-20 (Pumping well stating in Parameter April 2003) August2005)
Sampling Event GWQS Sampling Event GWQS
Nitrate, Nitrate+ Nitrite Chloride (mg/I) Nitrate, Nitrate+ Nitrite
(10 mg/L) NoGWQS (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 1~~~':2 2.90
4thQt r--~----------■ ~t.hQtr 12/7/2005 <0.1 81 12/7/2005 1.80 .....
1st Qtr 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 4th.Qtr 11/8/2006 3.50 .......... ihshooi · 1st Qtr 2/28/2007 4 133 1st Qtr 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 .. .. ·3hai2008 1st Qtr 3/28/2008 2.2 131 1st Qtr 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
4th Qtr 10/15/2008 47.8 124 4th Qtr 10/15/2008 5.51 ....... .......... 1st Qtr 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
3rdQtr 9/14/2009 <0.1 43 3rd Qtr 9/14/2009 3.30
4th Qtr 12/22/2009 26.7 124 4th Qtr 12/22/2009 5.30 ········• .......... 1st Qtr 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
4th Qtr 10/15/2010 2.7 146 4th Qtr 10/15/2010 4.60 ····•······ .........
l stQtr 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 1/23/2012 7.90
2~0.tr--Gir,;201 2 --------------------------6/Giioii ,----------2.4 149 2nd Qtr 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 ....... . ....................... 1st Qtr 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
1st Qtr 1/27/2014 1.6 134 1st Qtr 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
4thQtr 10/21/2014 4.7 130 4th Qt( .. 10/21/2014 7.67
1st Qtr 3/9/2015 8.56 238 1st Qtr 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
4thQtr 10/19/2015 10.6 252 4thQtr 10/19/2015 6.23
1st Qtr 3/9/2016 15.7.Q 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
1st Qtr 3/8/2017 11.1 461 1st Qtr 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
4th Qtr 10/11/2017 0.377 139 4th Qtr 10/11/2017 8.91
3/iihoia ···· 3/12/2018
.......................................................... 1st Qtr 8.6 193 1st Qtr 9.5
2nd Qtr 6/8/2018 0.494 138 2nd Qtr 6/8/2018 10.4.Q
3rdQtr 8/30/2018 2.55 166 3rd Qtr 8/30/2018 8.14
4th Qtr 11/28/2018 0.233 140 4th Qtr ........ P/28/2018 9.72 ............
1st Qtr 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
3rd Qtr 9/4/2019 0.33 153 3rd Qtr 9/4/2019 10.2
~t.~ Qtr 12/10/2019 0.535 147 4th Qtr 12/10/2019 9.75
2/19/2020
.......... 2i19/2020 lstQtr 10.1 205 1st Qtr 9.81
2nd Qtr 5/27/2020 1.140 147 2nd Qtr 5/27/2020 7.23
3rdQtr 9/4/2020 11.6 188 TW4-20 Abandonded October 2020
4th.Qtr ..... 12/10/2020 1.1 104
2/23/2021 ............. 1st Qtr 6.6 167
2nd Qtr 6/9/2021 4.04 115
3rdQtr 8/24/2021 6.68 172
4thQtr 12/1/2021 11.1 184
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)
NoGWQS
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 1st Quarter 2022
Nitrate Contamination Investigation
White Mesa Uranium Mill
TW4-21 (Pumping well starting in Parameter TW4-22 {Pumping well stating in Parameter fone201S) 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
lstQtr 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 18.2
3rd Qtr 8/31/2005 10.1 NA 3rd Qtr 8/31/2005 15.7
4thQtr 12/7/2005 9.6 353 4th Qtr 12/7/2005 15.1
3/9/2006 . ..................................... lstQtr 8.5 347 1st Qtr 3/9/2006 15.3
2nd Qtr 6/14/2006 10.2 318 2nd Qtr 6/14/2006 14.3
3rd Qtr 7/20/2006 8.9 357 3rd Qtr 7/20/2006 14.S
'.\.t_hQtr 11/8/2006 ..................................... 8.7 296 4th Qtr 11/8/2006 15.9 . ......... lstQtr 2/28/2007 8.7 306 lstQtr 2/28/2007 20.9
2nd Qtr 6/27/2007 8.6 327 2nd Qtr 6/27/2007 19.3
3rd Qtr 8/15/2007 8.6 300 3rd Qtr 8/15/2007 19.3
4th Qtr 10/10/2007 8.3 288 4th Qtr 10/10/2007 18.8 ........ .......... . ......................... 1st Qtr 3/28/2008 14.3 331 1st Qtr 3/28/2008 39.1
2nd Qtr 6/25/2008 8.8 271 2nd Qtr 6/25/2008 41.9
3rdQtr 9/10/2008 7.57 244 3rd Qtr 9/10/2008 38.7
4th Qtr 10/15/2008 8.0 284 '.1.1~9\( 10/15/2008 36.3 .......... 3/11/2009 . 1st Qtr 3/11/2009 8.3 279 1st Qtr 20.7
2nd Qtr 6/23/2009 8.1 291 2nd Qtr 6/23/2009 20.6
3rd Qtr 9/14/2009 9.2 281 3rd Qtr 9/14/2009 40.3
4th Qtr 12/22/2009 8.4 256 4th Qtr 12/29/2009 17.8 ········· 1st Qtr 2/25/2010 8.4 228 1st Qtr 3/3/2010 36.8
2nd Qtr 6/14/2010 12.0 266 2nd Qtr 6/14/2010 19.0
3rd Qtr 8/13/2010 14.0 278 3rd Qtr 8/24/2010 15.0
4th Qtr 10/15/2010 7.0 210 4th Qtr 10/15/2010 16.0
1st Qtr 2/22/2011 9.0 303 1st Qtr 2/22/2011 18.0
2nd Qtr 6/28/2011 12.0 290 2nd Qtr 6/1/2011 17.0
3rd Qtr 8/17/2011 14.0 287 3rd Qtr 8/17/2011 15.0
4th Qtr 11/16/2011 13.0 287 4th Qtr 11/16/2011 19.0 ....... 1/19/2012 (l)lst Qtr ....... . I/i9/20i2 . . (l)lst Qtr 15.0 228 14.0
2~Qtr-------------------------------------1-■-------6/13/2012 11.0 285 2nd Qtr 6/13/2012 12.8
3rd Qtr 9/13/2012 13.0 142 3rd Qtr 9/12/2012 7.0
4th Qtr 10/4/2012 14.0 270 4th Qtr 10/4/2012 14.0
2/13/2013 ······································· (3)1stQtr-""iii.iiioi'3 ~-----------lstQtr 11.8 221
2nd Qtr 6/18/2013 13.8 243 2nd Qtr 6/5/2013
3rdQtr 9/13/2013 10.3 -207 3rd Qtr 9/3/2013
11/13/2013 10/29/2013 4th_Qtr 9.0 206 4th Qtr ..........
lstQtr 2/5/2014 11.4 200 1st Qtr 1/27/2014
2nd Qtr 5/22/2014 11.S 243 2nd Qtr 5/19/2014
3rd Qtr 8/27/2014 7.1 230 3rd Qtr 8/11/2014
4th_Qtr 10/29/2014 10.0 252 4th Qtr 10/29/2014 ········································ ··· 3/iihois· · 1st Qtr 3/12/2015 10.9 255 1st Qtr
(2)2nd Qtr 6/8/2015 13.1 494 2nd Qtr 6/8/2015
3~0i;:·--si31 /2015 --------------------8/31/2015 14.7 499 3rd Qtr
4thQtr 10/19/2015 14.3 413 '.'..!~-~r 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
3rdQtr 7/25/2016 16.S 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 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 3rd Qtr 7/26/2017
4th Qtr 10/11/2017 16.90 378 4th Qtr 10/11/2017
~~-MRC 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
~.t.~Qtr 10/22/2018 15.2 378 4th Qtr 11/28/2018
lstQtr 3/8/2019 9.0 180 lstQtr ·· 3/iihoig ··
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
4thQtr 12/10/2019 5.73 339 4th_Qtr 12/10/2019
2/19/2020
......................................... .......... 2/19/2020 . lstQtr 8.9 446 lstQtr
2nd Qtr 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
2/23/2021
..................................... ...... 2hiho2i . lstQtr 15.2 454 1st Qtr
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
4thQtr 12/1/2021 17.2 227 4th Qtr 12/1/2021
lstQtr 3/9)2022 i:2 .. 110 1st Qtr 3/9/2022
NA = not analyzed
(1) As of March 2012 both north and south wild hie ponds no longer receiving 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
OWMRC = Utah Division of Waste Management and Radiation Control
58.0
50.2
29.7
45.2
54.6
47.2
41.5
54.9
69.2
47.1
64.7
56.1
31.1
58.4
61.3
61.5
69.8
70.8
66.1
80.1
79.0
62.3
72.5
55.4
75.7
71.9
83.9
72.S
59.9
57.7
60.S
64.8
64.9
69.6
89.3
35.1
68.8 iia:ii
NA
NA
253
236
221
221
236
347
273
259
238
519
271
524
539
177
177
391
175
427
134
130
134
114
138
120
174 ...... 36 -------35
121
130 -------130
586
487
501
598
614
540
596
675
390
557
567
583
598
619
588
566
572
391
600
610
607
580
613
567
528
662
588
608
606
578
514
523
618
408
410
586 442
Table 14 of 16
Historic Nitrate, Nitrate+ Nitrite and Cloride Concentrations in Monitor Wells Up to the 1st Quarter 2022
Nitrate Contamination Investigation
White Mesa Uranium Mill
TW4-24(Pumping well starting in Parameter TW4-ZS (Pumping well stating in Parameter January2013) January2013)
Sampling Event GWQS Sampling Event GWQS
Nitrate, Nitrate+ Nitrite Chloride (mg/I) Nitrate, Nitrate+ Nitrite
(10 mg/L) NoGWQ5 (10 mg/L)
2nd Qtr 6/27/2007 26.1 770 2nd Qtr 6/27/2007 17.1
3rd Qtr 8/15/2007 29 791 3rd Qtr 8/15/2007 29
~.t.hQtr 10/10/2007 24.7 692 4th Qtr 10/10/2007 17
1st Qtr 3/28/2008 24.4 740 1st Qtr 3/28/2008 .. 18.7
2nd Qtr 6/25/2008 45.3 834 2nd Qtr 6/25/2008 22.1
3rd Qtr 9/10/2008 38.4 1,180 3rd Qtr 9/10/2008 18.8
-i.t.~ Qtr 10/15/2008 44.8 1,130 ~~~ . .9~'. 10/15/2008 21.3 .......... 1st Qtr 3/4/2009 30.S 1,010 1st Qtr 3/4/2009 15.3
2nd Qtr 6/23/2009 30.4 759 2nd Qtr 6/23/2009 ~
3rd Qtr 9/14/2009 30.7 618 3rd Qtr 9/14/2009 3.3
4th Qtr 12/16/2009 28.3 1,080 4th.Qtr 12/14/2009 14.2
1st Qtr 2/25/2010 33.1 896 1st Qtr 2/23/2010. 14.4
2nd Qtr 6/14/2010 30 639 2nd Qtr 6/14/2010 16
3rd Qtr 8/24/2010 31 587 3rd Qtr 8/10/2010 14
4th.Qtr ....... 10/15/2010 31 522 4th Qtr 10/15/2010 15
2/17/2011
. ......... . 2/16/2011 . 1st Qtr 31 1,100 1st Qtr 15
2nd Qtr 5/26/2011 35 1,110 2nd Qtr 5/25/2011 16
3rd Qtr 8/17/2011 34 967 3rd Qtr 8/16/2011 16
4th.Qtr 11/16/2011 35 608 4th.Qtr 11/15/2011 16 ....... ......................................... ·1/iG/ioii . 16 lstQtr 1/16/2012 37 373 lstQtr
2~0.tr--Gii,/201 2 -------------------------~-----------------37 355 2nd Qtr 5/31/2012 16
3rd Qtr 8/30/2012 37 489 3rd Qtr 9/4/2012 17
4thQtr 10/3/2012 38 405 4th.Qtr .... 10/3/2012 17
1st Qtr ........ ...... 2/11/2013 35.9 ............... 1,260 1st Qtr i/fi/2613 9.04 -----6 /5 /2013 --------------------fii'i'n"Jot;:-,__6/siioi3 ------------2nd Qtr 23.7 916 5.24
3rd Qtr 8/30/2013 33 998 3rd Qtr 9/4/2013 5.69
4th.Qtr ... 10/29/2013 35 ............................ 1,030 4th.Qtr .......... 10/31/2013 6.1
1st Qtr 1/27/2014 31.6 809 1st Qtr 1/27/2014 2.16
2nd Qtr 5/19/2014 35.0 1,020 2nd Qtr 5/19/2014 1.21
3rdQtr 8/11/2014 31.5 1,150 3rd Qtr 8/11/2014 1.6
4thQtr 10/21/2014 35.7 """""""""''''''''''1,050 4th Qtr 10/21/2014 1.03 ..........
3Fih o1s 1st Qtr 3/9/2015 34.6 944 1st Qtr 14.4
2nd Qtr 6/8/2015 31.8 1,290 2nd Qtr 6/8/2015 1.14
3rdQtr 8/31/2015 25.3 788 3rdQtr 8/31/2015 1.63
4th Qtr 10/19/2015 29.6 909 4th Qtr 10/19/2015 1.78
DWMRC split of TW4-25 1.50
1st Qtr 3/9/2016 29.1 989 1st Qtr 3/9/2016 0.837
2nd Qtr 5/23/2016 24.2 771 2nd Qtr 5/23/2016 0.959
3rdQtr 7/25/2016 34.4 1,180 3rd Qtr 7/25/2016 1.78
4th_Qtr ...... 10/12/2016 31.9 ..... ..1,010 4th Qtr 10/12/2016 1.24
3/8/2017
.......... lstQtr 41.3 1,090 1st Qtr 3/8/2017 17.0
2nd Qtr 6/13/2017 39.9 1,080 2nd Qtr 6/13/2017 0.976
3rdQtr 7/26/2017 40.0 1,230 3rd Qtr 7/26/2017 1.23
4thQtr 10/11/2017 31.7 895 4th Qtr 10/11/2017 1.29
DWMRC split ofTW4-24 32.0 J,1.qg ' ........... 3/12/2018 . 1st Qtr 3/16/2018 44.9 1,320 1st Qtr 2.23
2nd Qtr 6/14/2018 33.6 792 2nd Qtr 6/14/2018 1.14
3rdQtr 8/22/2018 33.8 996 3rd Qtr 8/22/2018 0.810
4thQtr 11/28/2018 38.4 },1.qq 4th_Qtr 11/28/2018 0.634 .......... · · 3/sh o19 · lstQtr 3/8/2019 39.3 1,040 1st Qtr 0.639
2nd Qtr 6/5/2019 33.2 1,020 2nd Qtr 6/5/2019 0.821
3rd Qtr 9/4/2019 36.4 1,130 3rd Qtr 9/4/2019 0.548
4thQtr 12/10/2019 33.8 J,q~q 4th Qtr 12/10/2019 0.841
2/19/2020
.......... 2/19/2020 . 1st Qtr 37.1 1,010 1st Qtr 0.607
2nd Qtr 5/27/2020 41.7 1060 2nd Qtr 5/27/2020 0.851
3rd Qtr 9/4/2020 39.1 1100 3rd Qtr 9/4/2020 0.994
4thQtr 10/28/2020 35.90 1050 4th_Qtr 10/28/2020 1.6 ......................................... .......... 2/23/2021 . lstQtr 2/23/2021 41.9 1,170 1st Qtr 3.43
2nd Qtr 6/9/2021 48.0 938 2nd Qtr 6/9/2021 1.57
3rd Qtr 8/24/2021 26.7 1010 3rd Qtr 8/24/2021 0.793
4th_Qtr ..... 12/1/2021 43.60 1140 4th Qtr 12/1/2021 0.978
3/9/2022 ......... 362 ········••·······•··•·•·••·••············ .......... · 3Fih oii · ·· lstQtr 890 1st Qtr 1.8
As of March 2012 both north and south wild life ponds no longer rece1v1ng water
Chloroform pumping well started January 2013.
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
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.S
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
io3
Table 15 of 16
Historic Nitrate, Nitrate+ Nitrite and Cloride Concentrations in Monitor Wells Up to the 1st 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 6/8/2015 35.2 345
3rd Qtr 8/31/2015 32.4 374
4th Qtr 10/19/2015 34.6 399
lstQtr 3/9/2016 28.4 332
2nd Qtr I 5/23/2016 27.9 389
3rdQtr 7/25/2016 33.4 294
4th Qtr 10/12/2016 26.1 304
1st Qtr 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
4th Qtr 11/28/2018 27.3 264 ........
1st Qtr 3/8/2018 30.1 209
2nd Qtr 6/5/2019 31.2 250
3rd Qtr 9/4/2019 25.8 228
4th_Qtr ........ 12/10/2019 25.5 220
1st Qtr 2/19/2020 28.3 236
2nd Qtr 5/27/2020 28.3 321
3rd Qtr 9/4/2020 29.S 273
4th Qtr 10/28/2020 28.7 254 ....... 1st Qtr 2/23/2021 26.9 242
2nd Qtr 6/9/2021 26.6 176
3rdQtr 8/24/2021 25.8 220
4th Qtr 12/1/2021 31.3 410
1st Qtr 3/9/2022 29.8 414
Shaded= Nitrate, Nitrate+ Nitrite concentrations greater than the Ground Water Quality Standard of 10 mg/l
MW-30
Table 16 of 16
Historic Nitrate, Nitrate+ Nitrite and Cloride Concentrations in Monitor Wells Up to the 1st 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
3rd Qtr 9/22/2005 12.8 125 3rd Qtr 9/22/2005 22.4
4th Qtr 12/14/2005 13.6 128 4th Qtr 12/14/2005 23.8 3/22/2006 . . .........
3/22/2006
. .........
1st Qtr 13.8 125 1st Qtr 24.1
2nd Qtr 6/21/2006 14.S 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 .......
3/15/2007
. ......... iJishooi · 1st Qtr 14.4 125 1st Qtr 23.2 ~
Chloride (mg/I)
NoGWQS
139
136
135 ···························· .... 133
138
131
127
132
2nd Qtr 2007 not sampled 2nd Qtr 2007 not sampled
3rdQtr 8/22/2007 14.6 126 3rd Qtr 8/22/2007 23.3 136
4th_Qtr ... 10/24/2007 14.9 122 4th_Qtr ... 10/24/2007 24.6 122 .......
1st Qtr 3/19/2008 14.8 118 lstQtr 3/19/2008 25 124
2nd Qtr 6/3/2008 18.7 125 2nd Qtr 6/3/2008 29.3 128
3rdQtr 8/4/2008 17.3 121 3rd Qtr 8/4/2008 28.7 124
4thQtr 11/5/2008 15.6 162 4th_Qtr .... 11/5/2008 29.9 119 ......................................... ...
lstQtr 2/3/2009 15.3 113 1st Qtr 2/3/2009 23.4 115
2nd Qtr 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
~t-~ Qtr 10/14/2009 15.0 129 4th Qtr 10/14/2009 22.6 138 ................ .......... . ....... . .................................................................. ......................................... lstQtr 2/9/2010 16.1 127 1st Qtr 2/9/2010 21.7 128
2nd Qtr 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 4th Qtr 11/9/2010 20 138
1st Qtr 2Jihoii . 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
3rdQtr 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
3rd Qtr 9/19/2012 16 130 3rd Qtr 9/18/2012 21 172
4th Qtr 12/26/2012 17.2 122 4th Qtr ... 12/18/2012 22.2 170 ....... 2/19/2013 .. 1st Qtr 2/26/2013 21.4 129 1st Qtr 19.3 174
2nd Qtr 5/15/2013 18.8 119 2nd Qtr 5/13/2013 23.8 169
3rd Qtr 7/10/2013 17.6 130 3rd Qtr 7/9/2013 21.7 182
4th_Qtr 11/20/2013 19.S 124 4th Qtr 11/18/2013 23.9 174 ····· ihshoiii · ............................. 2/17/2014 .. 1st Qtr 18.4 135 1st Qtr 20.6 197
2nd Qtr 6/3/2014 19.S 128 2nd Qtr 6/3/2014 23.1 173
3rdQtr 9/9/2014 16.8 139 3rd Qtr 9/3/2014 18.9 210
4th Qtr 11/10/2014 16.2 154 4th Qtr 11/4/2014 20.9 204 ....... iJiihois · ...
1st Qtr 14.9 136 1st Qtr 2/2/2015 18.7 211
2nd Qtr 4/8/2015 17 142 2nd Qtr 4/7/2015 19 211
3rd Qtr 8/11/2015 17.9 165 3rd Qtr 8/10/2015 19.9 264
4th Qtr ....... 11/11/2015 16.3 140 4th_Qtr .... 11/9/2015 18.4 215
1st Qtr 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
4th Qtr 11/3/2016 18 143 4th Qtr 11/1/2016 19.8 267 .............................. ·•······· . ...... 1st Qtr 2/2/2017 17.4 150 1st Qtr 2/7/2017 21.1 266
2nd Qtr 4/5/2017 18.3 146 2nd Qtr 5/1/2017 18.3 263
3rd Qtr 8/14/2017 19.2 173 3rd Qtr 8/14/2017 19.S 310
4th Qtr 11/1/2017 17.4 156 4th_Qtr .... 11/1/2017 19 292 .......
1st Qtr 2/22/2018 17.6 158 1st Qtr 2/20/2018 18.8 292
2nd Qtr 4/12/2018 17.3 145 2nd Qtr 4/17/2018 19 308
3rdQtr 9/11/2018 18 183 3rd Qtr 9/10/2018 20.1 333
4thQtr 10/22/2018 17.2 140 4th Qtr 10/24/2018 18.3 286
1st Qtr 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
3rdQtr 7/16/2019 19.3 181 3rd Qtr 7/16/2019 19.8 374
4th_Qtr ... 10/8/2019 18.2 170 ~~~(),~( 10/9/2019 19.8 318
1st Qtr 1/15/2020 16.4 182 1st Qtr 1/15/2026 . 17.S 381
2nd Qtr 4/6/2020 18.1 195 2nd Qtr 4/6/2020 18.8 376
3rdQtr 7/6/2020 18.4 185 3rd Qtr 7/7/2020 19.2 370
4th_Qtr ... 12/8/2020 12 166 4th Qtr 12/7/2020 18.8 311 ...
lstQtr 3/8/2021 17 192 1st Qtr 3/9/2021 17.4 388
2nd Qtr 4/14/2021 17.7 162 2nd Qtr 4/13/2021 18.6 377
3rdQtr 7/29/2021 20.6 188 3rd Qtr 7/27/2021 18.7 391
4th_Qtr .... 10/19/2021 14.3 182 4th Qtr 10/19/2021 18.1 371
lstQtr 1/17/2022 14.S 181 1st Qtr 1/19/202-X . 18.0 370
Shaded = Nitrate, Nitrate + Nitrite concentrations greater than the Ground Water Quality Standard of 10 mg/I
Table 2
Summary of QA/QC Duplicate Sample
1st Quarter 2022
Parameter GWQS Duplicate of TWN-18
TWN-18 TWN.,65 RPD
Nitrate + Nitrite (as N) 10 mg/L 0.99 <0.1 NA
Chloride none 40.9 40.5 1.0
NA = Not Analyzed
Data Discrlptions
MW4 MW-26 TW4-1 TW4-2
Nitrate (mg/L) 4.80 0.300 3.90 3.30
Nitrate _(g/L) 4.80E-03 3.00E-04 3.90E-03 3.30E-03
Nitrate (lbs/L) 1.06E-05 6.63E-07 8.62E-06 7.29E-06
Nitrate (lbs/geil) 4.01E-05 2.51E-06 3.26E-05 2.76E-05
Total gallons pumped 96291.3 29113.3 8251.8 11380.6
lbs of nitrate removed 3.87 0.07 0.27 0.31
Gallons of nitrate removed 0.31 0.01 0.02 0.03
Total lbs nitrate removed from all pumping wells
Total lbs nitrate removed from nitrate pumping wells
Tabel3
DWMRC Nitrate Mass Removal Calculations
Energy Fuels Resorses Inc. White Mesa MIii, Bland, Utah
1st Quarter 2022
Chlorofonn Pumpln11 Wells
TW4-4 TW4-11 TW4-19 TW4-21 TW4-37
6.60 7.40 1.70 2.20 29.80
6.60E-03 7.40E-03 1.70E-03 2.20E-03 2.98E-02
1.46E-05 1.63E-05 3.76E-06 4.86E-06 6.58E-05
5.52E-05 6.19E-05 1.42E-05 1.84E-05 2.49E-04
10434.1 1497.2 112209.2 91105.4 42923.5
0.58 0.09 1.60 1.68 10.70
0.05 0.01 0:13 0.14 0.87
55
33
Nitrate Pumping Wells
TW4-39 TW4-40 TW4-41 TWN-2 TW4-22 TW4-24 TW4-21l
2.90 2.50 6.20 15.3 40.4 36.2 1.800
2.90E-03 2.50E-03 6.20E-03 1.53E-02 4.04E-02 3.62E-02 1.80E-03
6.41E-06 5.52E-06 1.37E-05 3.38E-05 8.93E-05 8.00E-05 3.98E-06
2.43E-05 2.0'9E-05 5.18E-05 1.28E-04 3.38E-04 3.03E-04 1.51E-05
35550.2 53009.2 12247.8 16,188.7 22083.6 73545.0 92972.1
0.86 1.1 0.64 2.07 7.46 22.26 1.40
0.07 0.09 0,05 0.17 0.61 1.61 0.11