DRC-2021-004706 - 0901a06880e5a405

State of Utah
GARY R. HERBERT
Governor
SPENCER J. COX
Lieutenant Governor
Department of
Environmental Quality
L. Scott Baird Executive Director
DIVISION OF WASTE MANAGEMENT
AND RADIATION CONTROL
Ty L. Howard
Director DRC -Z000 410,6
MEMORANDUM
TO: Phil Goble Z/1"( Z.C)
FROM: Dean Henderson 2-A11-2
DATE: February 4, 2021
SUBJECT: Review of the November 12, 2020 3rd Quarter 2020 Nitrate Monitoring Report for the
Nitrate Contamination Investigation, Energy Fuels Resources (USA) Inc. ("EFR") White
Mesa Uranium Mill, near Blanding, Utah
The Utah Division of Waste Management and Radiation Control ("Division") has reviewed the EFR
November 12, 2020, 3rd Quarter, 2020 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 Report to be submitted to Division on or before December 1, of each year. The
Report was received by the Division on November 16, 2020 (date of Report November 12, 2020) 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.utah.gov
Printed on 100% recycled paper
Page 2
TWN-1, TWN-2, TWN-3, TWN-4, TWN-7, TWN-18, TW4-22 (pumping well), TW4-24 (pumping
well), and TW4-25 (pumping well), and Piezometer 1, Piezometer 2, and Piezometer 3A.
Groundwater Head Monitoring
For the 3rd Quarter, 2020 depth to groundwater was measured in the following wells and/or piezometers
as required in Part I.E.3 of the Permit:
• The quarterly groundwater compliance monitoring wells.
• Existing monitoring well MW-4 and all of the temporary chloroform investigation
wells.
• Piezometers P-1, P-2, P-3A, P-4 and P-5.
• MW-20, MW-22 and MW-34
• Nitrate monitoring wells.
• The DR piezometers which were installed during the Southwest Hydrologic
Investigation.
In addition to the above, depth to water measurements are routinely observed in conjunction with
sampling events for all wells sampled during quarterly and accelerated efforts, regardless of the
sampling purpose. All well levels used for groundwater contour mapping were measured and recorded
within 5 calendar days of each other.
The monitoring wells were purged using the three approved QAP well purging strategies and meet QAP
requirements for each strategy:
1. Purging two casing volumes with stable field parameters for specific conductivity,
turbidity, pH, redox potential, and water temperature (within 10% RPD):
Wells: TWN-1, TWN-4, and TWN-18.
2. Purging a well to dryness and stability of field parameters for pH, specific conductivity, and
water temperature only after recovery:
Wells: TWN-3 and TWN-7.
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-4 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 (see Table 2 below).
Holding Times
The method holding times for each paraineter 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
The Report estimated 82 lbs. of nitrate was 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 82 lbs. removed, approximately 38
lbs. or 41%, 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:
i. 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;
ii. 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
Page 4
through time and, analytical results for each well summarized in data table that includes
historic analytical results for each well; and
iii. An electronic copy of all laboratory results for groundwater quality monitoring conducted
during the quarter will be provided to the Executive Secretary.
d) Conclusions and Recommendations
e) Copies of EFR field reports, laboratory reports, and chain of custody forms.
Evaluation of the Nitrate Contaminate Plume and Its Associated Contaminants
The groundwater monitoring data appeared to show that the nitrate contaminate plume ("Plume") is
bound by up gradient, cross gradient, and down gradient wells that have a nitrate concentrations below
the Utah 10 mg/L groundwater quality standard (GWQS) with the exception of up-gradient monitor well
TWN-7 (15.2 mg/1). TWN-7 has continued to exceed Utah GWQS for nitrate since the 2nd quarter
2018. Because of the ground water mounding effect that still exists from the former norther former wild
life ponds it appears that elevated nitrate concentrations exceeding Utah GWQS at well TWN-3 have
flowed west and downgradient to cause nitrate concentrations to exceed Utah GWQS at TWN-7.
Therefore, the Division and EFR had a conference call on February 2, 2021 to discuss preliminary
findings of the Divisions review of the Report. In the meeting, both parties acknowledged that the
nitrate concentrations observed in monitor well TWN-7 has exceeded the Utah 10 mg/L groundwater
quality standard. Due to the lack of information to the west and southwest of the well, EFR agreed to
install two additional monitoring wells. EFR committed to the following:
1) Two additional monitor wells will be installed. One well west and downgradient of well TWN-7
and one well southwest of TWN-7 to further define the boundaries of the nitrate contaminate
plume and ground water flow directions.
2) On or before April 1, 2021 EFR will provide for the Division approval the proposed locations of
the two new wells mentioned above and a schedule when these wells would be drilled and
installed.
The above agreed to commitments by EFR where confirmed in a Division confirmatory action letter sent
on February 3, 2021.
Based on water level data, groundwater contour, and capture zone maps in the Report other than at
monitor well TWN-7, it appears that up-gradient of pumping wells TW4-19, TW4-22, TW4-24, TW4-
37, and TW4-39 the nitrate plume appears to being captured.
Conclusions on Compliance with the CAP, QAP
Per the Division review it appears that the 3rd Quarter, 2020 Nitrate Monitoring Report for the Nitrate
Contamination Investigation, Energy Fuels Resources (USA) Inc. complies with the CAP and QAP.
Therefore, a letter will be drafted notifying EFR of the review and closing out of this report.
Page 5
References
Energy Fuels Resources (USA) Inc., White Mesa Uranium Mill, Groundwater Discharge Permit No.
UGW370004, signed March 19, 2019.
Energy Fuels Resources (USA) Inc., June 5, 2019, White Mesa Uranium Mill, Ground Water
Monitoring Quality Assurance Plan (Revision 7.5).
Energy Fuels Resources (USA) Inc., White Mesa Uranium Mill 3rd Quarter, 2020 Nitrate Monitoring
Report, November 12, 2020.
HYDRO GEO CHEM, INC, May 7, 2012, Corrective Action Plan for Nitrate White Mesa Uranium Mill
near Blanding, Utah.
Utah Division of Waste Management and Radiation Control, Confirmatory Action Letter, February 3,
2021, 3rd Quarter, 2020 Nitrate Groundwater Monitoring Report and Corrective Action Plan for the
Nitrate Plume. Installation of Additional Nitrate Monitor Wells Confirmatory Action Letter.
Table 1 of 16
Historic Nitrate, Nitrate + Nitrite and Cloride Concentrations in Monitor Wells Up to the 3rd Quarter 2020
Nitrate Contamination investigation
White Mesa Uranium Mill
TWN-1
Sampling Event
Parameter
GWQS
TWN-2 (Purnping well starnng in
January 2013)
Sampling Event
Parameter
GWQS
Nitrate, Nitrate + Nitrite
(10 mg/L)
Chloride (mg/l)
No GWQS
Nitrate, Nitrate + Nitrite Chloride (mg/l)
No GWQS (10 mg/L)
1st Qtr 3/17/2010 0.50 17 1st Qtr 3/24/2010 62 85
2nd Qtr 5/26/2010 0.6 20 2nd Qtr 6/2/2010 69 97
3rd Qtr 9/27/2010 0.6 19 3rd Qtr 9/29/2010 69 104
4th Qtr 12/7/2010 0.6 14 4th Qtr 12/9/2010 48 93
1st Qtr 1/26/2011 0.5 17 1st Qtr 2/1/2011 43 93
2nd Qtr 4/20/2011 0.5 19 2nd Qtr 4/28/2011 40 85
3rd Qtr 7/26/2011 0.5 14 3rd Qtr 7/28/2011 33 74
4th Qtr 10/17/2011 0.5 10 4th Qtr 10/20/2011 33 76
1st Qtr 1/9/2012 0.6 15 1st Qtr 1/12/2012 31 86
2nd Qtr 4/18/2012 0.6 17 2nd Qtr 4/20/2012 48 103
-3rd Qtr 7/24/2012 0.6 17 3rd atr - -7/31/201-2 - 54 93.
4th Qtr 10/17/2012 0.43 17.5 4th Qtr 7/17/2012 22.1 - 79
-1st Qtr 2/18/2013 0.68 17.6 1st Qtr 2/19/2013 57.3 80.
2nd Qtr 4/23/2013 0.84 17.4 2nd Qtr 4/24/2013 57.7 82.1
3rd Qtr 8/27/2013 1.24 24.1 3rd Qtr 8/27/2013 80.0 75.9
4th Qtr 10/16/2013 1.61 26.8 4th Qtr 7/16/2013 111 70.4
TWN-65 duplicat of TWN-1 1.48 27.1 DRC split of TWN-2 200 75
DRC split of TWN-1 1.6 30
DRC duplicate of TWN-1 0.22 30
15t Qtr 1/14/2014 1.47 29.2 1st Qtr 1/13/2014 42.6 72.4
2nd Qtr 5/6/2014 1.63 31.1 2nd Qtr 5/7/2014 44.7 84.9
3rd Qtr 8/5/2014 1.7 - 26 3rd Qtr 8/6/2014 42 80
TWN-65 duplicate of TWN-1 1.4 28
4th Qtr 10/8/2014 1.46 27.6 4th Qtr 10/8/2014 71 81
1st Qtr
I
2/18/2015 1.37 27.8 1st Qtr 2/18/2015 48.6 87.8
TWN-65 dup of TWN-1 1.41 29.0
2nd Qtr 5/13/2015 0.65 29.2 2nd Qtr 5/12/2015 52.8 83.6
3rd Qtr 8/25/2015 0.624 33.2 3rd Qtr 8/25/2015 49.7 87.8
4th Qtr 10/13/2015 1.35 27.7 4th Qtr 10/14/2015 45 74.9
1st Qtr 2/23/2016 1.51 30.3 1st Qtr 2/23/2016, 86.3 73.9
2nd Qtr 5/17/2016 1.73 32.1 2nd Qtr 5/17/2016 45.4 74.5
3rd Qtr 7/20/2016 1.76 29.6 3rd Qtr 7/20/2016 35.3 68.8
4th Qtr 10/6/2016 1.98 33 4th Qtr 10/11/2016 32.6 69.8
1st Qtr 2/15/2017 2.06 31.2 15t Qtr 2/15/2017 27.4 65.8
TWN-65 duplic te of TWN-1 1.98 31.5
2nd Qtr 6/1/2017 1.89 32.7 2nd Qtr 6/1/2017 25.0 61.5
PNN-65 duplic te of TWN-1 1.88 31.5
3rd Qtr 7/19/2017 2.07 31.2 3rd Qtr 7/19/2017 23.9 64.2
1WN-65 duplic te of TWN-1 1.89 31.4
4th Qtr 10/4/2017 1.95 30.8 4th Qtr 10/4/2017 31.9 60.5
1WN-65 duplic te of TWN-1 1.99 32.0
1st Qtr 1/18/2018 1.86 30.4 1st Qtr 1/19/2018 19.6 57.1
2nd Qtr 5/8/2018 1.89 28.4 2nd Qtr 5/9/2018 19.8 62.3
3rd Qtr 8/8/2018 1.97 34.2 3rd Qtr 8/8/2018 18.6 61.5
4th Qtr 11/20/2018 1.98 28.9 4th Qtr 11/20/2018 19.6 56
15t Qtr 2/20/2019 2.1 31.4 15t Qtr 2/20/2019 19.0 50.7
2nd Qtr 5/29/2019 1.93 32.6 2nd Qtr 5/29/2019 45.1 102
3rd Qtr 8/14/2019 2.15 30.3 3rd Qtr 8/14/2019 23.2 50.7
4th Qtr 10/16/2019 2.35 32.0 4th Qtr 10/16/2019 18.2 53
DWMRC split o TWN-1 2.1 31.0 DWMRC split of TWN-2 16.0 52
15t Qtr 1/29/2020 2.24 33.8 1st Qtr 1/29/2020 16.5 66.1
2nd Qtr
I
5/20/2020 2.24 33.0 2nd Qtr 5/20/2020 16.1 59.6
3rd Qtr 7/15/2020 2.36 30.8 3rd Qtr 7/15/2020 17.2 55.6
Shaded = Nitrate, Nitrate + Nitrite concentrations greater than the Ground Water Quality Standard of 10 mg/l
DRC = Utah Division or Radiation Control.
DWMRC = Utah Division of Waste Management and Radiation Control
Nitrate Purnping System Started in January 2013
As of March 2012 both north and south wild life ponds no longer receiving water.
Table 2 of 16
Historic Nitrate, Nitrate + Nitrite and Cloride Concentrations in Monitor Wells Up to the 3rd Quarter 2020
Nitrate Contamination Investigation
White Mesa Uranium Mill
TWN-3
Sampling Event
Parameter
GWQS
TWN-4
Sampling Event
Parameter
GWQS
Nitrate, Nitrate + Nitrite
(10 mg/L)
Chloride (mg/l)
No GWQS
Nitrate, Nitrate + Nitrite
(10 mg/L)
Chloride (mg/l)
No GWQ5
1st Qtr 3/25/2010 25.3 111 1st Qtr 3/16/2010 0.9 22
2nd Qtr 6/3/2010 26 118 2nd Qtr 5/27/2010 1.0 22
3rd Qtr 7/16/2010 27 106 3rd Qtr 9/27/2010 0.9 19
4th Qtr 12/10/2010 24 117 4th Qtr 12/8/2010 1.0 21
1st Qtr 2/1/2011 24 138 1st Qtr 1/25/2011 0.9 21
2nd Qtr 4/28/2011 26 128 2nd Qtr 4/20/2011 0.9 21
3rd Qtr 7/29/2011 25 134 3rd Qtr 7/26/2011 , 1.1 , . 35
4th Qtr 10/20/2011 25 129 4th Qtr 10/18/2011 0.9 20
1st Qtr 1/12/2012 25 143 1st Qtr 1/9/2012 0.9 20
2nd Qtr - - -- - 4/20/2012 24 152 2nd Qtr 4/18/2012 1.1 24
TWN-65 duplicate of 1WN-4 1.1 24
3rd Qtr 7/31/2012 27 158 3rd Qtr 1 7/25/2012 1.4 25
, 1WN-65 duplicate of 1WN-4 1.5 26
4th Qtr 10/17/2012 12.1 149 4th Qtr 7/15/2012 1.45 26.4
1st Qtr 2/19/2013 22.2 157 1st Qtr
I_
2/18/2013 1.5 25.3-
TWN-65 duplicate of TWN-4 1.5 25.9
2nd Qtr 4/24/2013 27.2 158 2nd Qtr 4/23/2013 1.63 24.4
3rd Qtr 8/28/2013 20.9 171 3rd Qtr
1
8/27/2013 1.6 27.2
1WN-65 duplicate of TWN-4 1.57 29.0
4th Qtr 10/17/2013 23.5 163 4th Qtr l 7/16/2013 1.69 29.4
TWN-65 duplicate of TWN-4 0.22 32
1st Qtr 1/15/2014 19.6 160 1st Qtr 11/14/2014 1.41 28.4
haiN-65 duplicate of TWN-4 1.33 26.4
2nd Qtr 5/7/2014 23.6 168 2nd Qtr l 5/6/2014 1.55 29.6
TWN-65 duplicate of TWN-4 1.54 26.6
3rd Qtr 8/6/2014 19.5 174 3rd Qtr 8/5/2014 2.0 28
4th Qtr 10/9/2014 19.1 153 4th Qtr 10/8/2014 1.44 30.7
1st Qtr 2/19/2015 19.4 164 1st Qtr • 2/18/2015 1.48 31.5
2nd Qtr 5/14/2015 17.2 141 2nd Qtr 5/13/2015 0.733 31.9
3rd Qtr 8/26/2015 16.2 156 3rd Qtr 8/25/2015 0.974 35.2
TWN-65 duplicate of TWN-4 1.160 35.2
4th Qtr 10/14/2015 16.3 129 4th Qtr 10/13/2015 1.58 28.4
TWN-65 duplicate or1WN-4 1.45 25.6
1st Qtr 2/24/2016 16.8 128 1st Qtr 2/23/2016 2.02 30.7
2nd Qtr 5/18/2016 13.5 116 2nd Qtr 5/17/2016 2.97 31.7
3rd Qtr 7/20/2016 16.8 110 3rd Qtr 7/20/2016 3.14 28.0
4th Qtr 10/7/2016 15.8 113 4th Qtr 10/6/2016 3.09 31.3
1st Qtr 2/16/2017 17.4 113 1st Qtr 2/15/2017 2.63 31.2
2nd Qtr 6/2/2017 15.9 108 2nd Qtr 6/1/2017 2.4 28.6
3rd Qtr 7/20/2017 15.9 106 3rd Qtr 7/19/2017 2.35 28.0
4th Qtr 10/4/2017 15.6 111 4th Qtr 10/4/2017 2.27 27.4
1st Qtr 1/19/2018 14.4 107 1st Qtr 1/18/2018 2.63 31.2
2nd Qtr 5/9/2018 16.4 115 2nd Qtr 5/9/2018 1.9 27.7
3rd Qtr 8/9/2018 19.4 149 3rd Qtr 8/8/2018 1.54 28
TWN-65 duplicate of TWN-4 1.51 27.6
4th Qtr 11/21/2018 20.1 123 4th Qtr 11/20/2018 1.48 22.7
1WN-65 duplicate of TWN-4 1.51 23.2
1st Qtr 2/21/2019 20.7 140 1st Qtr 2/20/2019 1.53 25.3
2nd Qtr 5/30/2019 18.7 137 2nd Qtr 5/29/2019 1.5 26.5
3rd Qtr 8/15/2019 19.8 133 3rd Qtr 8/14/2019 1.81 23.7
4th Qtr 10/17/2019 19.6 126 4th Qtr 10/16/2019 2.15 25.4
DWMRC split of TWN-3 17.0 130 TWN-65 duplicate of llaIN-4 2.15 24.7
DWMRC split of TWN-4 1.9 26.0
1W4-40 DWMRC duplicate of TWN
4 1.9 26.0
1st Qtr ' 19.41 156 1st Qtr 1/29/2020 1.89 27.2
2nd Qtr
1/30/20201
5/21/2020 24 136.0 2nd Qtr 5/20/2020 1.75 25.1
1WN-65 duplica e of TWN-4 1.71 25.4
3rd Qtr l 7/15/20201 22.21 130 3rd Qtr 1 7/15/2020 1.75 23.1
TWN-65 duplicate of TWN-4 1.73 23.1
Shaded = Nitrate, Nitrate Nitrite concentrations greater than the Ground Water Quality Standard of 10 mg/I
Nitrate Pumping Syste ;ri January 2013
As of March 2012 both north and south wild life ponds no longer receiving wate
Table 3 ot 16
Historic Nitrate, Nitrate + Nitrite and Cloride Concentrations in Monitor Wells Up to the 3rd Quarter 2020
Nitrate Contamination Investigation
White Mesa Uranium Mill
TWN-5
Sampling Event
Parameter
GWQS
1WN-6
Sampling Event
Parameter
GWQS
Nitrate, Nitrate + Nitrite
(10 mg/L)
Chloride (mg/l)
No GWQS
Nitrate, Nitrate + Nitrite
(10 mg/L)
Chloride (mg/l)
No GWQS
1st Qtr 3/16/2010 0.3 43 1st Qtr 3/23/2010 1.5 19
2nd Qtr 5/26/2010 0.3 44 2nd Qtr 6/1/2010 1.4 22
3rd Qtr 7/12/2010 0.3 43 3rd Qtr 7/13/2010 1.4 73
4th Qtr . 12/7/2010 0 3 . 45 4th Qtr 12/7/2010 1 2 21
1st Qtr 1/25/2611 0.4 47 1st Qtr 1/26/2011 1.1 18
2nd Qtr 4/20/2011 0.3 44 2nd Qtr 4/20/2011 1 5 22
3rd Qtr 7/26/2011 0.3 44 3rd Qtr 7/27/2011 1.1 17
4th Qtr 10/17/2011 0.3 45 4th Qtr 10/18/2011 1 4 21
1st Qtr 1/9/2012 0.2 45 1st Qtr 1/10/2012 1.2 20
2nd Qtr 4/18/2012 0.3 39 2nd Qtr 4/18/2012 1.1 22
3rd Qtr 7/24/2012 0 3 48 3rd Qtr 7/25/2012 1.4 22
4th Qtr 10/15/2012 <0.1 43 5 4th Qtr 7/15/2012 . . ..... 0.78 . 20.4
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 1 NA = Per the CAP and SCO, not sampled
Table 4 of 16
Historic Nitrate, Nitrate + Nitrite and Cloride Concentrations in Monitor Wells Up to the 3rd Quarter 2020
Nitrate Contamination Investigation
White Mesa Uranium Mill
TWN-7
Sampling Event
Parameter
GWQS
TWN-8
Sampling Event
Parameter
GWQS
Nitrate, Nitrate + Nitrite
(10 mg/L)
Chloride (mg/l)
No GWQS
Nitrate, Nitrate + Nitrite
(10 mg/L)
Chloride (mg/l)
No GWQS
1st Qtr 3/17/2010 0.8 6 1st Qtr 3/16/2010 <0.1 11
2nd Qtr 5/28/2010 1.2 6 2nd Qtr 5/26/2010 <0.1 11
3rd Qtr 7/14/2010 1.8 7 3rd Qtr 7/12/2010 <0.1 11
4th Qtr 12/1.0/2010 1 4 4th Qtr 12/7/2010 <0.1. 9
1st Qtr 1/27/2011 1.3 6 1st Qtr 1/25/2011 <0.1 13
2nd Qtr 4/21/2011 1.7 6 2nd Qtr 4/19/2011 <0.1 10
3rd Qtr 7/29/2011 0.7 5 3rd Qtr 7/26/2011 <0.1 18
4th Qtr 10/19/2011. 2.2 6 4th Qtr 10/17/2011 <0.1 10
1st Qtr 1/11/2012 2.3 5 1st Qtr 1/9/2012 <0.1 11
2nd Qtr 4/20/2012 1.2 6 2nd Qtr 4/18/2012,.f0.1 15
-3rd Qtr 7/26/2012 0.9 6 3rd Qtr 7/24/2012 <0.1 1.1:
4th Qtr 10/16/2012 0.64 5.67 4th Qtr 10/15/2012 <0.1 -/. 11.1 . -1st Qtr 2/19/2013 0.59 5.68 1st Qtr 2013 NA
2nd Qtr 4/24/2013 1.16 5.88 . 2nd Qtr 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 Qtr 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
4th Qtr 10/7/2016 0.698 6.17
1st Qtr 2/16/2017 1.63 14.0
2nd Qtr 6/2/2017 3.74 29.7
3rd Qtr 7/20/2017 2.7 29.0
4th Qtr 10/5/2017 3.58 41.4
1st Qtr 1/19/2018 5.82 69.4
2nd Qtr 5/9/2018 10.2 94.7
3rd Qtr 8/9/2018 10.6 105.0
4th Qtr 11/21/2018 11.5 104
1st Qtr 2/21/2019 12.9 107.0
2nd Qtr 5/30/2019 13.5 122.0
3rd Qtr 8/15/2019 12.9 120.0
4th Qtr 10/17/2018 14.5 119
DWAARC split of TWN-7 12.0 120
1st Qtr 1/30/2019 14.2 128.0
2nd Qtr 5/21/2020 14.6 126.0
3rd Qtr 7/16/2019 15.2 116.0
Shaded = Nitrate, Nitrate + Nitrite concentrations greater than the Ground Water Quality Standard of 10 mg/l
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 3rd Quarter 2020
Nitrate Contamination Investigation
White Mesa Uranium Mill
TWN-9
Sampling Event
Parameter
GWQS
TWN-10
Sampling Event
Parameter
GWQS
Nitrate, Nitrate + Nitrite
(10 mg/L)
Chloride (mg/l)
No GWQS
Nitrate, Nitrate + Nitrite
(10 mg/L)
Chloride (mg/l)
No GWQS
1st Qtr 3/23/2010 7.6 183 1st Qtr 3/23/2010 1.5 54
2nd Qtr 6/1/2010 7.7 175 2nd Qtr 6/2/2010 1.0 30
3rd Qtr 7/15/2010 10.7 210 3rd Qtr 7/14/2010 0.2 21
4th Qtr 12/9/2010 8.0 172 4th Qtr 12/8/2010 1.3 28
1st Qtr 2/1/2011 9.5 217 1st Qtr 1/26/2011 0.3 40
2nd Qtr 4/28/2011 10.0 192 2nd Qtr 4/21/2011 1.2 28
3rd Qtr 7/29/2011 11.0 208 3rd Qtr 7/27/2011 0.1 28
4th Qtr 10/20/2011 10.9 134 4th Qtr 10/18/2011 0.2 33
1st Qtr 1/12/2012 12.2 202 1st Qtr 1/10/2012 0.8 44
TW4-65 dup of TWN-10 0.7
2nd Qtr 4/20/2012 10.6 209 2nd Qtr 4/19/2012 0.9 28
3rd Qtr 7/31/2012 12.3 215 3rd Qtr 7/25/2012 0.6 33
4th Qtr 10/17/2012 12.5 194 4th Qtr 7/16/2012 0.12 30.8
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 (mel) Nitrate, Nitrate + Nitrite Chloride (mg/l)
(10 mg/L) No GWQS (10 mg/L) No GWQS
1st Qtr 3/17/2010 1.4 73 1st Qtr 3/17/2010 0.7 113
2nd Qtr I 6/1/2010 1.3 72 2nd Qtr 5/26/2010 0.8 106
3rd Qtr 9/27/2010 1.4 76 3rd Qtr 7/12/2010 0.7 112
4th Qtr 12/8/2010 1.4 72 4th Qtr 12/7/2010 0.7 103 .......... 1st Qtr 1/27/2011 1.4 84 1st Qtr 1/26/2011 4.2 87
2nd Qtr I 4/26/2011 1.4 76 2nd Qtr 4/26/2011 1.0 109
3rd Qtr 7/27/2011 0.1 76 3rd Qtr 7/26/2011 0.6 102
4th Qtr 10/17/2011 1.6 76 4th Qtr 10/17/2011 1.2 87
1st Qtr 1/10/2012 1.6 69 1st Qtr 1/10/2012 0.9 104
[ate of TWN-11 1.6 70
2nd Qtr 4/19/2012 1.6 71 2nd Qtr 4/18/2012 1.2 106
3rd Qtr 7/25/2012 1.8 77 3rd Qtr 7/25/2012 1.4 102
4th Qtr 10/16/2012 1.84 76.4 4th Qtr 7/16/2012 1.41 101
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 4- Nitrite concentrations greater than the Ground Water Ctuality Standard of 10 rng/I
NA = Per the CAP and SCO, not sampled
Shaded = Nitrate, Nitrate + Nitrite concentrations greater than the Ground Water Quality Standard of 10 mg/l
Table 6 of 16
Historic Nitrate, Nitrate + Nitrite and Cloride Concentrations in Monitor Wells Up to the 3rd Quarter 2020
Nitrate Contamination Investigation
White Mesa Uranium Mill
TWN-13
Sampling Event
Parameter
GWQS
TWN-14
Sampling Event
Parameter
GWQS
Nitrate, Nitrate + Nitrite
(10 mg/L)
Chloride (mg/l)
No GWQS
Nitrate, Nitrate + Nitrite
(10 mg/L)
Chloride (mg/l)
No GWQS
1st Qtr 3/17/2010 <0 1 47 1st Qtr 3/24/2010 2.9 24
2nd Qtr 5/26/2010 0.1 49 2nd Qtr 6/2/2010 2 9 30
3rd Qtr 9/27/2010 0.2 53 3rd Qtr 7/15/2010 3.5 26
4th Qtr 12/7/2010 0.4 57 4th Qtr 12/10/2010 4 2 28
1st Qtr 1/25/2011 1 6 103 1st Qtr 1/28/2011 3.7 24
2nd Qtr 4/26/2011 <0.1 49 2nd Qtr 4/27/2011 3.5 30
3rd Qtr 7/26/2011 0 1 49 3rd Qtr 7/29/2011 3.5 25
4th Qtr 10/17/2011 <0.1 48 4th Qtr 10/19/2011 3.9 . .. ... 27
1st Qtr 1/9/2012 <0 1 46 1st Qtr 1/11/2012 3.5 26
2nd Qtr 4/18/2012 <0.1 53 2nd Qtr 4/20/2012 3.4 27
3rd Qtr 7/24/2012 0.1 48 3rd Qtr 7/27/2012 3 7 27
1W4-70 duplicate of TWN-14 3.8 27
4th Qtr 10/15/2012 <0.1 47.3 4th Qtr 7/17/2012 4.03 27.4
1st Qtr 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
lsi Qtr 2014.KA
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 - NA 1st Qtr 2018
2nd Qtr 2018 NA
3rd Qtr 2018 NA
4th Qtr 2018 NA
1st Qtr 2019 NA
2nd QV 2019 NA
3rd Qtr 2019 NA
4th Qtr 2019 NA
1st Qtr 2020 NA
2nd Qtr 2020 NA
3rd Qtr 2020 NA
NA = Per the CAP and SCO, not sampled
Table 7 of 16
Historic Nitrate, Nitrate + Nitrite and Cloride Concentrations in Monitor Wells Up to the 3rd Quarter 2020
Nitrate Contamination Investigation
White Mesa Uranium Mill
TWN-15
Sampling Event
Parameter
GWQS
TWN-16
Sampling Event
Parameter
GWQS
Nitrate, Nitrate + Nitrite
(10 mg/L)
Chloride (mg/I)
No GWQ5
Nitrate, Nitrate + Nitrite
(10 mg/L)
Chloride (mg/l)
No GWQS
1st Qtr 3/18/2010 0 7 43 1st Qtr 3/17/2010 1 2 35
2nd Qtr 5/28/2010 1 0 39 2nd Qtr 5/27/2010 1 3 35
3rd Qtr 7/13/2010 1.0 36 3rd Qtr 9/27/2010 2.6 35
4th Qtr 12/9/2010 1.2 ... . ... 38 4th Qtr 12/9/2010 . .. . ... . 2 30
1st Qtr 1/27/2011 1 4 43 lsi Qtr 1/27/2011 4.6 34
2nd Qtr 4/27/2011 1.6 49 2nd Qtr 4/27/2011 1.6 39
3rd Qtr 7/28/2011 1 6 47 3rd Qtr 7/27/2011 2.4 31
4th.Qtr 10/19/2011 1.3 . 38 4th Qtr 10/18/2011 2.6 34
1st Qtr 1/11/2012 1.5 38 1st Qtr 1/10/2012 2.8 33
2nd Qtr 4/20/2012 1.6 46 2nd Qtr 4/19/2012 2.0 50
1W4-70 duphcate of TAN-15 1.7 46
3rd Qtr 7/26/2012 2.1 50 3rd Qtr 7/25/2012 2.4 33
4th Qtr 10/17/2012 1 79 47 4th Qtr 7/16/2012 2.50 32.1
1W4-70 duphc, p!1WN-15 2.0 44.4 ....... . ... 1st Qtr 2013. NA .1;t Qtr 2013 NA
2nd Qtr
I
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 . .... lsi Qtr 2015 N-A
2nd Qtr 2015 NA
3rd Qtr 2015 NA
4th Qtr 2015 NA . — 1st Qtr 2016 iiA
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
NA = Per the CAP and SCO, not sampled
Table 8 of 16
Historic Nitrate, Nitrate + Nitrite and Cloride Concentrations in Monitor Wells Up to the 3rd Quarter 2020
Nitrate Contamination Investigation
White Mesa Uranium Mill
TWN-17
Sampling Event
Parameter
GWQS
TWN-18
Sampling Event
Parameter
GWQS
Nitrate, Nitrate + Nitrite
(10 mg/L)
Chloride (mg/0
No GWQS
Nitrate, Nitrate + Nitrite
(10 mg/L)
Chloride (mg/0
No GWQS
1st Qtr 3/24/2010 10.4 78 1st Qtr 3/17/2010 1.6 42
2nd Qtr 6/3/2010 11 87 2nd Qtr 6/1/2010 1.8 63
3rd Qtr 7/15/2010 8.9 66 3rd Qtr 9/27/2010 1.8 64
4th Qtr 12/10/2010 8 65 4th Qtr 12/9/2010 L6 59
1st Qtr 2/1/2011 8.6 90 1st Qtr 1/27/2011 1.4 61
25d Qtr 4/28/2011 9 81 2nd Qtr 4/26/2011 1.8 67
3rd Qtr 7/29/2011 8.5 74 3rd Qtr 7/28/2011 1.8 65
4th Qtr 10/20/2011 8.1 71 4th Qtr 10/18/2011 1.9 60
1st Qtr 1/12/2012 8.7 79 1st Qtr 1/10/2012 1.9 64
2nd Qtr _ 4/20/2012 9.1 80 2nd Qtr 4/19/2012 2.1 64 -3Ed 7:1T- - -771756I2 9.5 85 3rd Qtr 7/26/2012 2.3 67-
4th Qtr .... 10/17/2012 9.65 84.8 4th Qtr 7/16/2012 1.95 67.5
IsT Ejtr 2013 NA 1st Qtr . . , . 2/18/2013 2.27 68.i
2nd Qtr 2013 NA 2nd Qtr 4/23/2013 2.32 64.3
1W4-65 dup of TWN-18 2.46 66.1
3rd Qtr 2013 NA 3rd Qtr 8/27/2013 2.04 70.4
TWN-17 abandoned on July 31, 2013 4th Qtr 10/16/2013 2.15 67.3
DRC split sample 0.29 74
1st Qtr 2/14/2014 2.33 68.4
2nd Qtr 5/6/2014 2.18 76.5
3rd Qtr 8/5/2014 1.8 70
4th Qtr 10/8/2014 1.47 74.8
TW4-65 dup of TWN-18 1.47 72.3
1st Qtr 2/18/2015 1 73.3
2nd Qtr
1
5/13/2015 1.35 76.6
1W4-65 dup of TWN-18 <0.10 76.9
3rd Qtr 8/25/2015
1 10/13/2015
0.35 8L3
4th Qtr 0.668 69
TW4-65 dup of 1WN-18 0.645 68.6
1st Qtr 2/23/2016 0.648 67.6
2nd Qtr 5/17/2016 0.497 69.9
3rd Qtr 7/21/2016 <0.100 52.7
4th Qtr 10/6/2016 0.501 67.4
1st Qtr 2/15/2017 0.47 62.1
2nd Qtr 6/1/2017 0.392 63.9
3rd Qtr 7/19/2017 0.419 59.0
4th Qtr 10/4/2017 0.256 56.6
1st Qtr 1/18/2018 0.332 53.1
2nd Qtr 5/8/2018 0.283 57.8
3rd Qtr 8/8/2018 0.348 59.7
4th Qtr 11/21/2018 0.16 48.1 lst Qtr 2/20/2019 0.155 46.4
TWN-65 dup of TWN-18 0.174 49.9
2nd Qtr 5/29/2019 0.129 50.0
TWN-65 dup of TWN-18 0.152 53.3
3rd Qtr 8/14/2019 0.181 46.9
TWN-65 dup of TWN-18 0.184 47.3
4th Qtr 10/16/2019 0.162 47.1
DWMRC duplicate of TWN-18 0.13 43.0
1st Qtr 1/29/2020 0.224 51.9
TWN-65 dup of TWN-18 0.249 50.6
2nd Qtr 5/20/2020 0.223 47.4
3rd Qtr 7/15/2020 0.232 44.0
NA = Per the CAP and SCO, not sampled
Shaded = Nitrate, Nitrate + Nitrite concentrations greater than the Ground Water Quality Standard of 10 mg/l
DRC = Utah Division of Radiation Control
Nitrate Pumping Systern Started in January 2013
As of March 2012 both north and south wild hfe ponds no Mnger receiving water.
Table 9 of 16
Historic Nitrate, Nitrate + Nitrite and Cloride Concentrations in Monitor Wells Up to the 3rd Quarter 2020
Nitrate Contamination Investigation
White Mesa Uranium Mill
TWN-19
Sampling Event
Parameter
GWQS
Upper Wildlife Pond
Sampling Event
Parameter
GWQS
Nitrate, Nitrate + Nitrite
(10 mg/L)
Chloride (mg/I)
No GWQS
Nitrate, Nitrate + Nitrite
(10 mg/L)
Chloride (mg/l)
No GWQS
1st Qtr 3/23/2010 7.2 118 1st Qtr 3/18/2010 <0.1 <1.0
2nd Qtr 6/1/2010 6.2. 113 2nd Qtr 6/2/2010 <0.1 <1.0
3rd Qtr 9/27/2010 7.2 113 3rd Qtr 7/19/2010 <0.1 <1.0
4th Qtr. 12/9/2010 . _ 7.0 ... .. .. 107 4th Qtr 12/10/2010 <0.1 1
1st Qtr 2/1./2611 7.0 114 1st Qtr 1/31/2011 0.1 1
2nd Qtr 4/28/2011 6.9 120 2nd Qtr 4/25/2011 <0.1 <1.0
3rd Qtr 7/28/2011 7.1 113 3rd Qtr 7/25/2011 <0 1 <1.0
4th Qtr 10/18/2011 6 5 108 4th Qtr 10/19/2011 .<0.1 <1.0
ist Qtr 1/10/2012 7.0 114 1st Qtr 1/31/2012 0.1 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 isi.A
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
1si Qtr 2016 NA
2nd Qtr 2016 NA
3rd Qtr 2016 NA
4th Qtr .. . . 2016 NA . • --- - • - 1st Qtr 2017 i4A
2nd Qtr 2017 NA
3rd Qtr 2017 NA
4th Qtr . 2017 NA • — - 1st Qtr 2618 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
NA = Per the CAP and SCO, not sampled
Table 10 of 16
Historic Nitrate, Nitrate + Nitrite and Cloride Concentrations in Monitor Wells Up to the 3rd Quarter 2020
Nitrate Contamination investigation
White Mesa Uranium Mill
Pizometer 1
Sampling Event
Parameter
GWQS
Pizometer 2
Sampling Event
Parameter
GWQS
Nitrate, Nitrate + Nitrite
(10 mg/L)
Chloride (mg/l)
No GWQS
Nitrate, Nitrate + Nitrite
(10 mg/L)
Chloride (mg/l)
No GWQS
2nd Qtr 6/2/2010 7.2 52 2nd Qtr 6/2/2010 0.6 8
3rd Qtr 7/19/2010 6.8 52 3rd Qtr 7/19/2010 0.6 8
4th Qtr 12/10/2010 6.5 60 4th Qtr 12/10/2010 0.2 6
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 8
3rd Qtr 7/25/2011 7 53 3rd Qtr 7/25/2011 0.1 9
4th Qtr 10/19/2011 6.6 55 4th Qtr 10/19/2011 0.1 ..,....8
• 1st Qtr 1/11/2012 7.1 78 1st Qtr 1/11/2012 0.1 9
1st Qtr 1/10/2012 7.0 114 1st Qtr 1/31/2012 0.1 1
2nd Qtr 4/20/2012 6.6 58 2nd Qtr 4/20/2012 0.2 8
3rd Qtr 7/27/2012 7.2 56 3rd Qtr 7/27/2012 0.2 4
4th Qtr _.4. 10/17/2012 7.66 55 4th Qtr 7/17/2012 0.19 9.5
1st Qtr 2/19/2013 8.11 56.7 1st Qtr 2/19/2013 0.22 9.6i
2nd Qtr 4/24/2013 8.88 53.3 2nd Qtr 4/24/2013 0.172 10.3
3rd Qtr 8/28/2013 7.83 55.1 3rd Qtr 8/28/2013 0.198 9.66
4th Qtr 10/16/2013 6.68 54.1 4th Qtr 10/16/2013 0.36 9.22
DRC split of Pie -1 1.3 60 DRC split of Piez 2 0.27 11
1st Qtr 1/13/2014 6.79 56.2 1st Qtr 1/13/2014 0.169 11.4
2nd Qtr 5/7/2014 7.57 52.1 2nd Qtr 5/7/2014 0.736 11.4
3rd Qtr 8/6/2014 5.1 55 3rd Qtr 8/6/2014 0.8 12
4th Qtr 10/8/2014 5.75 57.6 4th Qtr 10/8/2014 • 0.755 12.2
1st Qtr 2/18/2015 6.41 55.9 1st Qtr 2/18/2015 0.749 12.5
2nd Qtr 5/12/2015 5.95 57.5 2nd Qtr 5/12/2015 0.646 13.1
3rd Qtr 8/26/2015 4.96 64.2 3rd Qtr 8/6/2015 0.7 15.5
4th Qtr 10/14/2015 6.17 54.4 4th Qtr 10/14/203.5 0.692 13.3
1st Qtr 2/23/2016 8.31 56.5 1st Qtr 2/23/2016 0.615 13.4
2nd Qtr 5/12/2016 6.33 59.1 2nd Qtr 5/12/2016 0.665 14
3rd Qtr 7/19/2016 6.78 53.9 3rd Qtr 7/19/2016 0.669 12.4
4th Qtr 10/11/2016 6.42 58.1 4th Qtr 10/11/2016 0.732 13.4
15t Qtr 2/15/2017 6.75 54.5 1st Qtr 2/15/2017 0.696 12.4
2nd Qtr 6/1/2017 6.6 54.7 2nd Qtr 6/1/2017 0.345 13.2
3rd Qtr 7/20/2017 6.8 58 3rd Qtr 7/20/2017 0.555 13.4
4th Qtr 10/4/2017 6.21 54.4 4th Qtr 10/4/2017 0.684 12.7
1st Qtr 1/17/2018 6.35 55.3 1st Qtr 1/17/2018 0.716 13.0
2nd Qtr 5/9/2018 6.56 58 2nd Qtr 5/9/2018 0.776 14.0
3rd Qtr 8/8/2018 6.66 63.5 3rd Qtr 8/8/2018 0.818 15.1
4th Qtr 11/21/2018 6.7 55.5 4th Qtr 11/20/2018 0.648 12.3
1st Qtr 2/19/2019 6.72 56.8 1st Qtr 2/19/2019 0.599 12.9
2nd Qtr 5/30/2019 6.75 59.4 2nd Qtr 5/30/2019 0.702 12.6
3rd Qtr 8/14/2019 6.81 61.1 3rd Qtr 8/14/2019 0.606 13.2
4th Qtr 10/16/2019 7.21 59.3 4th Qtr 10/16/2019 0.573 12.6
DWMRC dup icate of P-1 6.4 60 DWMRC duplicate of P-2 0.36 21
1st Qtr 1/30/2020 7.12 68.9 1st Qtr 1/30/2020 0.740 14.2
2nd Qtr 5/20/2020 6.95 67.7 2nd Qtr 5/20/2020 0.679 14.4
3rd Qtr 7/15/2019 7.36 63.6 3rd Qtr 7/15/2019 0.793 12.7
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.
Table 11 of 16
Historic Nitrate, Nitrate + Nitrite and Cloride Concentrations in Monitor Wells Up to the 3rd Quarter 2020
Nitrate Contamination Investigation
White Mesa Uranium Mill
Pizometer 3
Sampling Event
Parameter
GWQS
Pizometer 3A
Sampling Event
Parameter
GWQS
Nitrate, Nitrate + Nitrite
(10 mg/L)
Chloride (mg/l)
No GWQS
Nitrate, Nitrate + Nitrite
(10 mg/L)
Chloride (mg/l)
No GWQS
1st Qtr 3/24/2010 1.7 116
2nd Qtr 6/2/2010 1.6 36
3rd Qtr 7/19/2010 1.8 35
4th Qtr 12/9/2010 1.8 25
1st Qtr 1/31/2011 1.8 40
2nd Qtr 4/25/2011 1.7 35
3rd Qtr 7/25/2011 1.8 61
4th Qtr 10/19/2011 1.7 12
1st Qtr 1/11/2012 1.8 20
2nd Qtr 4/20/2012 1.7 53
3rd Qtr 7/27/2012 1.8 21
4th Qtr 10/17/2012 2.75 20.1
1st Qtr 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 sarnple 0.33 27
1st Qtr 1/13/2014 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
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 May 2016.
Pizometer-3 abandonded May 2016 (1)2nd Qtr 5/12/2016 8.33 109
3rd Qtr 7/19/2016 8.83 93.8
4th Qtr 10/11/2016 8.44 100
1st Qtr 2/15/2017 10.0 111
2nd Qtr 6/1/2017 10.1 124
3rd Qtr 7/20/2017 9.31 105
4th Qtr 10/4/2017 9.65 107
1st Qtr 2/17/2018 8.61 94.3
2nd Qtr 5/9/2018 9.98 100
3rd Qtr 8/8/2018 12.1 122
4th Qtr 11/20/2018 11.8 105
1st Qtr 2/17/2019 11.8 102
2nd Qtr 5/30/2019 11.8 104
3rd Qtr 8/14/2019 10.7 96.2
4th Qtr 10/16/2019 8.97 83.0
DWMRC dupl cate of P-3a 6.4 98.0
1st Qtr 1/30/2020 10.5 99.5
2nd Qtr 5/20/2020 12.4 88.3
3rd Qtr 7/15/2020 12.8 82.7
1. New piezorneter PIEZ-3A to replace PIEZ-3 drilled and installed in May 2016. First rnonitoring 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.
Table 12 of 16
Historic Nitrate, Nitrate + Nitrite and Cloride Concentrations in Monitor Wells Up to the 3rd Quarter 2020
Nitrate Contamination investigation
White Mesa Uranium Mill
TW4-19(Purnping well starhng in
April 2003)
Sampling Event
Parameter
GWQS
TW4-20 (Pumping well stating al
August 2005)
Sampling Event
Parameter
GWQS
Nitrate, Nitrate + Nitrite
(10 mg/L)
Chloride (mg/l)
No GWQS
Nitrate, Nitrate + Nitrite
(10 mg/L)
Chloride (mg/l)
No GWQS
1st Qtr 3/16/2005 5.3 NA
2nd Qtr 5/25/2005 5.7 NA 2nd Qtr 5/25/2005 10.10 NA
3rd Qtr 8/31/2005 4.6 NA 3rd Qtr 8/31/2005 2.90 NA
4th Qtr 12/7/2005 <0.1 81 4th Qtr 12/7/2005 '- 1.80 131:
1st Qtr 3/9/2006 4 86 1st Qtr 3/9/2006 3.80 120
2nd Qtr 6/14/2006 5.2 116 2nd Qtr 6/14/2006 9.40 235
3rd Qtr 7/20/2006 4.3 123 3rd Qtr 7/20/2006 2.90 134
4th Qtr 11/8/2006 4.6 134 4th Qtr 11/8/2006 3.50 124
1st Qtr 2/28/2007 4 133 1st Qtr 2/28/2007 4.20 124
2nd Qtr 6/27/2007 not sampled 2nd Qtr 6/27/2007 2.30 112
3rd Qtr 8/15/2007 4.1 129 3rd Qtr 8/15/2007 2.10 117
4th Qtr 10/10/2007 4 132 4th Qtr 10/10/2007 5.60 170
1st Qtr 3/28/2008 2.2 131 1st Qtr 3/28/2008 0.90 132
2nd Qtr 6/25/2008 2.8 128 2nd Qtr 6/25/2008 8.00 191
3rd Qtr 9/10/2008 35.2 113 3rd Qtr 9/10/2008 4.44 156
4th Qtr 10/15/2008 47.8 124 4th Qtr 10/15/2008 5.51 168
1st Qtr 3/4/2009 3.2 127 1st Qtr 3/4/2009 5.10 164
2nd Qtr 6/23/2009 2.4 132 2nd Qtr 6/23/2009 2.90 164
3rd Qtr 9/14/2009 <0.1 43 3rd Qtr 9/14/2009 3.30 153
4th Qtr 12/22/2009 26.7 124 4th Qtr 12/22/2009 5.30 187
1st Qtr 2/17/2010 2 144 1st Qtr 2/17/2010 2.00 179
2nd Qtr 6/14/2010 4.4 132 2nd Qtr 6/14/2010 5.60 200
3rd Qtr 8/16/2010 5.9 142 3rd Qtr 8/16/2010 5.30 196
4th Qtr 10/15/2010 2.7 146 4th Qtr 10/15/2010 4.60 203
1st Qtr 2/17/2011 17.0 135 1st Qtr 2/17/2011 4.40 220
2nd Qtr 6/7/2011 12.0 148 2nd Qtr 6/7/2011 4.80 177
3rd Qtr 8/17/2011 3.0 148 3rd Qtr 8/17/2011 6.50 207
4th Qtr 11/17/2011 5.0 148 4th Qtr 11/17/2011 4.20 186
1st Qtr 1/23/2012 0.6 138 1st Qtr 1/23/2012 7.90 267
and Qtr - -65/70-1 .2.' 2.4 149 2nd Qtr 6/6/2012 , 11.00 26i
3rd Qtr 9/4/2012 2.5 149 3rd Qtr 9/4/2012 10.80 289
4th Qtr 10/3/2012 4.1 150 4th Qtr 10/3/2012 11.00 302
1st Qtr 2/13/2013 8.0 164 1st Qtr 2/13/2013 9.07 252
2nd Qtr 6/5/2013 3.0 148 2nd Qtr 6/5/2013 9.80 250
3rd Qtr 9/3/2013 17.6 179 3rd Qtr 9/3/2013 8.65 260
4th Qtr 10/29/2013 4.7 1.34 4th Qtr 10/29/2013 9.64 272
1st Qtr 1/27/2014 • 1.6 134 1st Qtr 1/27/2014 7.56 254
2nd Qtr 5/19/2014 1.3 152 2nd Qtr 5/19/2014 5.95 269
3rd Qtr 8/11/2014 1.6 140 3rd Qtr 8/11/2014 4.30 299
4th Qtr 10/21/2014 4.7 130 4th Qtr 10/21/2014 7.67 292
15t Qtr 3/9/2015 8.56 238 1st Qtr 3/9/2015 9.80 290
2nd Qtr 6/8/2015 0.916 180 2nd Qtr 6/8/2015 5.76 296
3rd Qtr 8/31/2015 11.6 326 3rd Qtr 8/31/2015 9.3 365
4th Qtr 10/19/2015 10.6 252 4th Qtr 10/19/2015 6.23 293
1st Qtr 3/9/2016 15.70 276 1st Qtr 3/9/2016 10.30 293
2nd Qtr 5/26/2016 1.27 204 2nd Qtr 5/26/2016 11.2 318
3rd Qtr 7/25/2016 10.5 214 3rd Qtr 7/25/2016 11.3 307
4th Qtr 10/13/2016 10.0 200 4th Qtr 10/13/2016 11.4 301
1st Qtr 3/8/2017 11.1 461 1st Qtr 3/8/2017 12.0 290
2nd Qtr 6/13/2017 0.243 135 2nd Qtr 6/13/2017 9.76 281
3rd Qtr 7/26/2017 1.120 218 3rd Qtr 7/26/2017 10.8 292
4th Qtr 10/11/2017 0.377 1.39 4th Qtr 10/11/2017 8.91 293
1st Qtr 3/12/2018 8.6 193 1st Qtr 3/12/2018 9.5 289
2nd Qtr 6/8/2018 0.494 138 2nd Qtr 6/8/2018 10.40 258
3rd Qtr 8/30/2018 2.55 166 3rd Qtr 8/30/2018 8.14 282
4th Qtr 11/28/2018 0.233 140 4th Qtr 11/28/2018 9.72 295
15t Qtr 3/8/2019 6.6 197 1st Qtr 3/8/2019 6.7 272
2nd Qtr 6/5/2019 6.580 160 2nd Qtr 6/5/2019 9.59 279
3rd Qtr 9/4/2019 0.33 153 3rd Qtr 9/4/2019 10.2 286
4th Qtr 12/10/2019 0.535 147 4th Qtr 12/10/2019 9.75 307
1st Qtr 2/19/2020 10.1 205 1st Qtr 2/19/2020 9.81 -iiii
2nd Qtr 5/27/2020 1.140 147 2nd Qtr 5/27/2020 7.23 301
3rd Qtr 9/4/2020 11.6 188 TW4-20 Abandonded October 2020
Shaded = Nitrate, Nitrate + Nitrite concentrations greater than the Ground Water Quality Standard of 10 mg/l
As of March 2012 both north and south wild life pond, • _- (2)Pumping well stating in August 2005
Table 13 of 16
Historic Nitrate, Nitrate + Nitrite and Cloride Concentrations in Monitor Wells Up to the 3rd Quarter 2020
Nitrate Contamination Investigation
White Mesa Uranium Mill
TW4-21 (pumping well starting in
lune 2015)
Sampling Event
Parameter
GWQS
TW4-22 (Pumping well stating in
August 2005)
Sampling Event
Parameter
GWQS
Nitrate, Nitrate + Nitrite
(10 mg/L)
Chloride (mg/I)
No GWQS
Nitrate, Nitrate + Nitrite
(10 mg/L)
Chloride (mg/I)
No GWQS
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 18.2 NA
3rd Qtr 8/31/2005 10.1 NA 3rd Qtr 8/31/2005 15.7 NA
4th Qtr 12/7/2005 9.6 353 4th Qtr 12/7/2005 15.3. 253
1st Qtr 3/9/2006 8.5 347 1st Qtr 3/9/2006 15.3 236
2nd Qtr 6/14/2006 10.2 318 2nd Qtr 6/14/2006 14.3 221
3rd Qtr 7/20/2006 8.9 357 3rd Qtr 7/20/2006 14.5 221.
4th Qtr 11/8/2006 8.7 296 4th Qtr 11/8/2006 15.9 236
1st Qtr 2/28/2007 8.7 306 1st Qtr 2/28/2007 20.9 347
2nd Qtr 6/27/2007 8.6 327 2nd Qtr 6/27/2007 19.3 273
3rd Qtr 8/15/2007 8.6 300 3rd Qtr 8/15/2007 19.3 259
4th Qtr 10/10/2007 8.3 288 4th Qtr 10/10/2007 18.8 238
1st Qtr 3/28/2008 14.3 331 1st Qtr 3/28/2008 39.3. 519
2nd Qtr 6/25/2008 8.8 271 2nd Qtr 6/25/2008 41.9 271
3rd Qtr 9/10/2008 7.57 244 3rd Qtr 9/10/2008 38.7 524
4th Qtr 10/15/2008 8.0 284 4th Qtr 10/15/2008 36.3 539
1st Qtr 3/11/2009 8.3 279 1st Qtr 3/11/2009 20.7 177
2nd Qtr 6/23/2009 8.1 291 2nd Qtr 6/23/2009 20.6 177
3rd Qtr 9/14/2009 9.2 281 3rd Qtr 9/14/2009 40.3 391
4th Qtr 12/22/2009 8.4 256 4th Qtr 12/29/2009 17.8 175
1st Qtr 2/25/2010 8.4 228 1st Qtr 3/3/2010 36.8 427
2nd Qtr 6/14/2010 12.0 266 2nd Qtr 6/14/2010 19.0 134
3rd Qtr 8/13/2010 14.0 278 3rd Qtr 8/24/2010 15.0 130
4th Qtr 10/15/2010 7.0 210 4th Qtr 10/15/2010 16.0 134
1st Qtr 2/22/2011 9.0 303 1st Qtr 2/22/2011 18.0 114
2nd Qtr 6/28/2011 12.0 290 2nd Qtr 6/1/2011 17.0 138
3rd Qtr 8/17/2011 14.0 287 3rd Qtr 8/17/2011 15.0 120
4th Qtr 11/16/2011 13.0 287 4th Qtr 11/16/2011 19.0 174
(1)1st Qtr 1/19/2012 15.0 228 (1)1st Qtr 1/19/2012 14.0 36
2nd Qtr 6/13/2012 11.0 285 2nd Qtr 6/13/2012 12.8 3'
3rd Qtr 9/13/2012 13.0 142 3rd Qtr 9/12/2012 7.0 121
4th Qtr 10/4/2012 14.0 270 4th Qtr 10/4/2012 14.0 130
1st Qtr 2/13/2013 11.8 221 (3)1st Qtr 2/11/2013 58.0 136
2nd Qtr 6/18/2013 13.8 243 2nd Qtr 6/5/2013 50.2 586
3rd Qtr 9/13/2013 10.3 207 3rd Qtr 9/3/2013 29.7 487
4th Qtr 11/13/2013 9.0 206 4th Qtr 10/29/2013 45.2 501
1st Qtr 2/5/2014 11.4 200 1st Qtr 1/27/2014 54.6 598
2nd Qtr 5/22/2014 11.5 243 2nd Qtr 5/19/2014 47.2 614
3rd Qtr 8/27/2014 7.1 230 3rd Qtr 8/11/2014 41.5 540
4th Qtr 10/29/2014 10.0 252 4th Qtr 10/29/2014 54.9 596
1st Qtr 3/12/2015 10.9 255 1st Qtr 3/9/2015 69.2 675
(2)2nd Qtr 6/8/2015 13.1 494 2nd Qtr 6/8/2015 47.1 390
-3rd Qtr 8/31/2015 14.7 499 3rd Qtr 8/31/2015 64.7 557
4th Qtr 10/19/2015 14.3 413 4th Qtr 10/19/2015 - 56.1 567
1st Qtr 3/9/2016 14.6 452 1st Qtr 3/9/2016 31.1 583
2nd Qtr 5/23/2016 13.1 425 2nd Qtr 5/23/2016 5814 598
3rd Qtr 7/25/2016 16.5 457 3rd Qtr 7/25/2016 61.3 619
4th Qtr 10/12/2016 13.5 439 4th Qtr 10/12/2016 61.5 588
1st Qtr 3/8/2017 17.7 452 1st Qtr 3/8/2017 69.8 566
2nd Qtr 6/13/2017 9.53 309 2nd Qtr 6/13/2017 70.8 572
3rd Qtr 7/26/2017 18.20 447 3rd Qtr 7/26/2017 66.1. 391
4th Qtr 10/11/2017 16.90 378 4th Qtr 10/11/2017 80.1 600
DWMRC split TW4-21 11.0 310 DWMRC split of TW4-22 79.0 610
1st Qtr 3/12/2018 15.8 447 1st Qtr 3/12/2018 62.3 607
2nd Qtr 6/8/2018 14.1 387 2nd Qtr 6/8/2018 72.5 580
3rd Qtr 8/22/2018 0.236 182 3rd Qtr 8/22/2018 55.4 613
4th Qtr 10/22/2018 15.2 378 4th Qtr 11/28/2018 75.7 567
1st Qtr 3/8/2019 9.0 180 1st Qtr 3/8/2019 71.9 528
2nd Qtr 6/5/2019 17.5 456 2nd Qtr 6/5/2019 83.9 662
3rd Qtr 9/4/2019 14.7 478 3rd Qtr 9/4/2019 72.5 588
4th Qtr 12/10/2019 5.73 339 4th Qtr 12/10/2019 59.9 608
1st Qtr 2/19/2020 8.9 446 1st Qtr 2/19/2020 57.7 606
2nd Qtr 5/27/2020 15.4 353 2nd Qtr 5/27/2020 60.5 578
3rd Qtr 9/4/2020 12.6 382 3rd Qtr 9/4/2020 64.8 514
NA = not analyzed (1) As of March 2012 both north and south wild life ponds no )onger recemng water.
(2) Chloroform pumping well started 6/9/15.
(3) Chloroform pumping well started 1/26/13.
Shaded = Nitrate, Nitrate + Nitrite concentrations greater than the Ground Water Quality Standard of 10 mg/I
DWMRC = Utah Division of Waste Management and Radiation Control
Table 14 of 16
Historic Nitrate, Nitrate + Nitrite and Cloride Concentrations in Monitor Wells Up to the 3rd Quarter 2020
Nitrate Contamination Investigation
White Mesa Uranium Mill
TW4-241Purnping well starting in
January 2013)
Sampling Event
Parameter
GWQS
TW4-25 (Pumping well stating in
January 2013)
Sampling Event
Parameter
GWQS
Nitrate, Nitrate + Nitrite Chloride (mg/l)
No GWQS
Nitrate, Nitrate + Nitrite
(10 mg/L)
Chloride (mg/l)
No GWQS (10 mg/L)
2nd Qtr 6/27/2007 26.1 770 2nd Qtr 6/27/2007 17.1 395
3rd Qtr 8/15/2007 29 791 3rd Qtr 8/15/2007 29 382
4th Qtr 10/1.0/2007 24.7 692 4th Qtr 10/10/2007 17 358
1st Qtr 3/28/2008 24.4 740 1st Qtr 3/28/2008 18.7 374
2nd Qtr 6/25/2008 45.3 834 2nd Qtr 6/25/2008 22.1 344
3rd Qtr 9/10/2008 38.4 1,180 3rd Qtr 9/10/2008 18.8 333
4th Qtr 10/15/2008 44.8 1,130 4th Qtr 10/15/2008 21.3 366
1st Qtr 3/4/2009 30.5 1,010 1st Qtr 3/4/2009 15.3 332
2nd Qtr 6/23/2009 30.4 759 2nd Qtr 6/23/2009 15.3 328
3rd Qtr 9/14/2009 30.7 618 3rd Qtr 9/14/2009 3.3 328
4th Qtr 12/16/2009 28.3 1,080 4th Qtr 12/14/2009 14.2 371
ist Qtr 2/25/2010 33.1 896 1st Qtr 2/23/2010 144 296
2nd Qtr 6/14/2010 30 639 2nd Qtr 6/14/2010 16 306
3rd Qtr 8/24/2010 31 587 3rd Qtr 8/10/2010 14 250
4th Qtr 10/15/2010 31 522 4th Qtr 10/15/2010 15 312
1st Qtr 2/17/2011 31 1,100 1st Qtr 2/16/2011 15 315
2nd Qtr 5/26/2011 35 1,110 2nd Qtr 5/25/2011 16 321
3rd Qtr 8/17/2011 34 967 3rd Qtr 8/16/2011 16 276
4th Qtr 11/16/2011 35 608 4th Qtr 11/15/2011 16 294
1st Qtr _ 1/16/2012 37 373 1st Qtr 1/16/2012 16 304 1 al 717- 6/6/2012 37 355 2nd Qtr 5/31/2012 16 28i
3rd Qtr 8/30/2012 37 489 3rd Qtr 9/4/2012 17 334
4th Qtr 10/3/2012 38 405 4th Qtr 10/3/2012 17 338
1st Qtr 271172013 35.9 1,260 1st Qtr 2/1.112.013 9.04 190
2nd Qtr 6/5/2013 23.7 917 (2)2nd Qtr 6/5/2013 5.24 13e
3rd Qtr 8/30/2013 33 998 3rd Qtr 9/4/2013 5.69 119
4th Qtr 10/29/2013 35 1,030 4th Qtr 10/31/2013 6.1 88.6
1st Qtr 1/27/2014 31.6 809 1st Qtr 1/27/2014 2.16 85.7
2nd Qtr 5/19/2014 35.0 1,020 2nd Qtr 5/19/2014 1.21 51.1
3rd Qtr 8/11/2014 31.5 1,150 3rd Qtr 8/11/2014 1.6 67
4th Qtr 10/21/2014 35.7 1,050 4th Qtr 10/21/2014 1.03 58.1
1st Qtr 3/9/2015 34.6 944 1st Qtr 3/9/2015 14.4 310
2nd Qtr 6/8/2015 31.8 1,290 2nd Qtr 6/8/2015 1.14 58.3
3rd Qtr 8/31/2015 25.3 788 3rd Qtr 8/31/2015 1.63 69.2
4th Qtr 10/19/2015 29.6 909 4th Qtr 10/19/2015 1.78 93.7
DWMRC split of TW4-25 1.50 94
1st Qtr 3/9/2016 29.1 989 1st Qtr 3/9/2016 0.837 62.7
2nd Qtr 5/23/2016 24.2 771 2nd Qtr 5/23/2016 0.959 75.5
3rd Qtr 7/25/2016 34.4 1,180 3rd Qtr 7/25/2016 1.78 74.1
4th Qtr 10/12/2016 31.9 1,010 4th Qtr 10/12/2016 1.24 59.8
1st Qtr 3/8/2017 41.3 1,090 1st Qtr 3/8/2017 17.0 285
2nd Qtr 6/13/2017 39.9 1,080 2nd Qtr 6/13/2017 0.976 69.8
3rd Qtr 7/26/2017 40.0 1,230 3rd Qtr 7/26/2017 1.23 70.1
4th Qtr 10/11/2017 31.7 895 4th Qtr 10/11/2017 1.29 68.0
DWMRC split of TW4-24 32.0 1,100
1st Qtr 3/16/2018 44.9 1,320 1st Qtr 3/12/2018 2.23 70.5
2nd Qtr 6/14/2018 33.6 792 2nd Qtr 6/14/2018 1.14 60.3
3rd Qtr 8/22/2018 33.8 996 3rd Qtr 8/22/2018 0.810 69.1
4th Qtr 11/28/2018 38.4 1,100 4th Qtr 11/28/2018 0.634 59.70
1st Qtr 3/8/2019 39.3 1,040 1st Qtr 3/8/2019 0.639 65.0
2nd Qtr 6/5/2019 33.2 1,020 2nd Qtr 6/5/2019 0.821 59.0
3rd Qtr 9/4/2019 36.4 1,130 3rd Qtr 9/4/2019 0.548 58.1
4th Qtr 12/10/2019 33.8 1,090 4th Qtr 12/10/2019 0.841 73.10
1st Qtr 2/19/2020 37.1 1,010 1st Qtr 2/19/2020 0.607 86.0
2nd Qtr 5/27/2020 41.7 1060 2nd Qtr 5/27/2020 0.851 76.8
3rd Qtr 9/4/2020 39.1 1100 3rd Qtr 9/4/2020 0.994 67.3
As of March 1í
Chloroform pumping well started 4/26/13.
Shaded = Nitrate, Nitrate + Nitrite concentrations greater than the Ground Water Quality Standard of 10 mg/l
DWMRC = Utah Division of Waste Ma nagernent and Radiation Control
.„4d south wild life ponds no longer receiving water
Table 15 of 16
Historic Nitrate, Nitrate + Nitrite and Cloride Concentrations in Monitor Wells Up to the 3rd Quarter 2020
Nitrate Contamination Investigation
White Mesa Uranium Mill
TW4-37(rurnping well starting in
June 2015)
Sampling Event
Parameter
GWQS
Nitrate, Nitrate + Nitrite
(10 mg/L)
Chloride (mg/l)
No GWCIS
2nd Qtr j 6/8/2015 35.2 345
3rd Qtr j 8/31/2015 32.4 374
4th Qtr j 10/19/2015 34.6 399
1st Qtr 3/9/2016 28.4 332
2nd Qtr 5/23/2016 27.9 389
3rd Qtr 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 29.5 273
Shaded = Nitrate, Nitrate + Nitrite concentrations greater than the Ground Water Quality Standard of 10 mg/I
Table 16 of 16
Historic Nitrate, Nitrate + Nitrite and Cloride Concentrations in Monitor Wells Up to the 3rd Quarter 2020
Nitrate Contamination Investigation
White Mesa Uranium Mill
MW-30
Sampling Event
Paramete
GWQS
MW-31
Sampling Event
Parameter
GWQS
Nitrate, Nitrate + Nitrite
(10 mg/L)
Chloride (mg/l)
No GWQS
Nitrate, Nitrate + Nitrite
(10 mg/L)
Chloride (mg/I)
No GWQS
2nd Qtr 6/22/2005 12.4 125 2nd Qtr 6/22/2005 24.2 139
3rd Qtr 9/22/2005 12.8 125 3rd Qtr 9/22/2005 22.4 136
4th Qtr 12/14/2005 13.6 128 4th Qtr 12/14/2005 23.8 135
1st Qtr 3/22/2006 13.8 125 1st Qtr 3/22/2006 24.1 133
2nd Qtr 6/21/2006 14.5 124 2nd Qtr 6/21/2006 25.3 138
3rd Qtr 9/13/2006 14.1 118 3rd Qtr 9/13/2006 24.6 131
4th Qtr 10/25/2006 14.6 124 4th Qtr 10/25/2006 25.1 127
1st Qtr 3/15/2007 14.4 125 1st Qtr 3/15/2007 23.2 132
2nd Qtr 2007 not sampled 2nd Qtr 2007 not sampled
3rd Qtr 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 1st Qtr 3/19/2008 25 124
2nd Qtr 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
4th Qtr 11/5/2008 15.6 162 4th Qtr 11/5/2008 29.9 119
lst Qtr 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
4th Qtr 10/14/2009 15.0 129 4th Qtr 10/14/2009 22.6 138
1st Qtr 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
4th Qtr 12/14/2010 16.0 126 4th Qtr 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 1st Qtr 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
1st Qtr 2/26/2013 21.4 129 1st Qtr 2/19/2013 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 19.5 124 4th Qtr 11/18/2013 23.9 174
1st Qtr 2/25/2014 18.4 135 1st Qtr 2/17/2014 20.6 197
2nd Qtr 6/3/2014 19.5 128 2nd Qtr 6/3/2014 23.1 173
3rd Qtr 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
1st Qtr 2/4/2015 • 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 1st Qtr 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 19.5 310
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
3rd Qtr 9/11/2018 18 183 3rd Qtr 9/10/2018 20.1 333
4th Qtr.._ 10/22/2018 17.2 _ _ 140 4th Qtr 10/24/2018 18.3 286
Ts7-Qtr 2/13/2019 18.2 167 1st Qtr 2/12/2019 18.6 296
2nd Qtr 4/10/2019 18.5 138 2nd Qtr 4/10/2019 19.7 294
3rd Qtr 7/16/2019 19.3 181 3rd Qtr 7/16/2019 19.8 374
4th Qtr 10/8/2019 18.2 170 4th Qtr 10/9/2019 19.8 318
1st Qtr 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
Shaded = Nitr te, Nitrate • Nitrite concentrations greater than the Ground Water Quality Standard of 10 rng/l
Table 2
Summary of QA/QC Duplicate Sample
3rd Quarter 2020
Parameter GWQS Duplicate of TWN-04
TWN-4 TWN-65 RPD
Nitrate + Nitrite (as N) 10 mg/L 1.75 1.73 1.15
Chloride none 23.1 23.1 0.0
Tabel 3
DRC Nitrate Mass Removal Calculations
Energy Fuels Resorses inc. White Mesa Mill, Bland, Utah
3rd Quarter 2020
Data Discriptions Chloroform Pumping Wells Nitrate Pumping Wells
MW4 MW-26 TW4-1 TW4-2 TW4-4 TW4-11 TW4-19 TW4-20 TW4-21 TW4-37 TW4-39 TW4-40 TW441 TWN-2 TW4-22 r TW4-24 TW4-25
Nitrate (mg/L) 4.93 0.42 2.22 3.35 7.04 7.59 11.60 AB 12.60 29.5 2.69 2.88 6.69 17.2 64.8 39.1 0.994
Nitrate (g/L) 4.93E-03 4.20E-04 2.22E-03 3.35E-03 7.04E-03 7.59E-03 1.16E-02 1.26E-02 2.95E-02 2.69E-03 2.88E-03 6.69E-03 1.72E-02 6.48E-02 3.91E-02 9.94E-04
Nitrate (lbs/L) 1.09E-05 9.28E-07 4.90E-06 7.40E-06 1.56E-05 1.68E-05 2.56E-05 2.78E-05 6.52E-05 5.94E-06 6.36E-06 1.48E-05 3.80E-05 1.43E-04 8.64E-05 2.20E-06
Nitrate (lbs/gal) 4.12E05 3.51E06 1.86E05 2.80E05 5.89E05 6.35E05 9.70E05 1.05E04 2.47E04 2.25E05 2.41E05 5.59E05 1.44E04 5 A2E-04 3.27E04 8.31E06
Total gallons pumped 84,607.8 23,663.7 9,487.3 14,009.5 14,389.9 1,984.1 154,514.4 99,515.1 56,659.3 35,628.2 86,264.5 13,411.4 21,279.1 23,050.6 53,316.1 83,956.3
lbs of nitrate removed 3.49 0.08 0.18 0.39 0.85 0.13 14.99 10.49 13.98 0.80 2.08 0.75 3.06 12.49 17.43 0.70
Gallons of nitrate removed 0.28 0.01 0.01 0.03 0.07 0.01 1.22 0.85 1.14 0.07 0.17 0.06 0.25 1.02 1.42 0.06
Total lbs nitrate removed from all pumping wells 82
Total lbs nitrate removed from nitrate pumping wells 34