DRC-2023-076720 - 0901a068812bf28a

State of Utah
SPENCER J. COX Governor DEIDRE HENDERSON Lieutenant Governor TO: Phil Goble
Department of Environmental Quality
Kimberly D. Shelley Executive Director DIVISION OF WASTE MANAGEMENT AND RADIATION CONTROL
Douglas J. Hansen Director MEMORANDUM
fo/t'),f<>L)
FROM:
DATE: Dean Henderson 111!
October 12, 2023
iofz/?-ozJ
SUBJECT: Review of the August 14, 2023 2nd Quarter 2023 Nitrate Monitoring Report (DRC-2023-070370) 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 August 14, 2023, 2nd Quarter, 2023 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 PermitNo. UGW370004, signed March 19, 2019 ("Permit").•Corrective Action Plan for Nitrate White Mesa Uranium Mill near Blanding, Utah, May 7, 2012,("CAP") approved December 12, 2012.•The EFR Quality Assurance Plan ("QAP") February 15, 2022 (Revision. 7.7)REVIEW The CAP requires the 2nd quarter Nitrate Monitoring Report for the Nitrate Contamination Investigation to be submitted to Division on or before September 1, of each year. The Report was received by the Division on July 17, 2023 (date of Report August 14, 2023) which meets the CAP requirement.
Monitor Wells Sampled and Parameters Analyzed
The following monitor wells were sampled and analyzed for inorganic chloride and nitrate + nitrite ( as N), and field data work sheets were filled out for each well as required in the CAP:
DRC-20 195 North 1950 West• Salt Lake City, UT Mailing Address: P.O. Box 144880 • Salt Lake City, UT 84114-4880 Telephone [phone] • Fax [phone] • T.D.D. [phone] www.deq.utah.gov Printed on I 00% recycled paper
DRC-2023-076720
Page 2
TWN-1, TWN-2, TWN-3, TWN-4, TWN-7, TWN-18, TNW-20, TWN-21, TW4-22 (pumping well), TW4-24 (pumping well), and TW4-25 (pumping well), and Piezometer 1, Piezometer 2, and Piezometer 3A.
Groundwater Head Monitoring
For the 2nd Quarter, 2023 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 investigationwells.•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 HydrologicInvestigation.
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, andwater temperature only after recovery:
Wells: TWN-3, TWN-7, TWN-20, and TWN-21
3.Continuously Pumped Wells that are considered sufficiently evacuated to immediatelycollect 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 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 67 lbs. of nitrate were removed from the chloroform pumping wells (MW-4, MW-26, TW4-1, TW4-2, TW4-4, TW4-l l, 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 67 lbs. removed, approximately 28 lbs. (or 42%) were removed by the nitrate pumping wells (see Table 3 below).
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 decontaminationprocedures;iii.Identification of all quality assurance samples, e.g. equipment blanksduplicate samples, etc.
c)Data Interpretation:1.Interpretation of groundwater levels, gradients, and flow directions. The interpretation willinclude a discussion on: 1) current site groundwater contour map, 2) hydro graphs to showgroundwater elevation in each monitor well over time, 3) depth to groundwater measured andgroundwater elevation from each monitor well summarized in data table that includes historicgroundwater level data for each well, 4) calculations documenting quarterly nitrate massremoved by pumping;n.Interpretation of all analytical results for each well including a discussion on: 1) a currentnitrate isoconcentration map, 2) graphs showing nitrate concentration trends in each wellthrough time and, analytical results for each well summarized in data table that includeshistoric analytical results for each well; and
Page 4
iii.An electronic copy of all laboratory results for groundwater quality monitoring conductedduring the quarter will be provided to the Executive Secretary.
d)Conclusions and Recommendations
e)Copies of EFR field reports, laboratory reports, and chain of custody forms.
Evaluation of the Nitrate Contaminate Plume and Its Associated Contaminants
The groundwater monitoring data appeared to show that the nitrate contaminate plume ("Plume") is bound by up gradient, cross gradient, and down gradient wells that have nitrate concentrations below the Utah 10 mg/L GWQS.
Based on water level data, groundwater contour, and capture zone maps in the it appears that up-gradient of pumping wells TW4-19, TW4-22, TW4-24, TW4-37, and TW4-39 the nitrate plume appears to being captured.
Conclusions on Compliance with the CAP, QAP
Per the Division review it appears that the 2nd Quarter, 2023 Nitrate Monitoring Report for the Nitrate Contamination Investigation, Energy Fuels Resources (USA) Inc. complies with the CAP and QAP. Therefore, a letter will be drafted notifying EFRI of the review and closing out of this Report.
Table 1 of 16 Historic Nitrate, Nitrate+ Nitrite and Cloride Concentrations in Monitor Wells Up to the 2nd Quarter 2023 Nitrate Contamination Investigation
TWN-1 Parameter
Sampling Event GWQS
Nitrate, Nitrate+ Nitrite (10 mg/L) lstQtr 3/17/2010 0.50 2nd Qtr 5/26/2010 0.6 3rd Qtr 9/27/2010 0.6 4th Qtr 12/7/2010 0.6 lstQtr 1/26/2011 0.5 2nd Qtr 4/20/2011 0.5 3rd Qtr 7/26/2011 0.5 4th Qtr 10/17/2011 0.5 lstQtr 1/9/2012 0.6 2nd Qtr 4/18/2012 0.6 -----3rd Qtr 4th Qtr -----7 /24/20121 0.6 10/17/2012 ----------0.43 lstQtr 2/18/2013 0.68 2nd Qtr 4/23/2013 0.84 3rd Qtr 8/27/2013 1.24 4th Qtr 10/16/2013 1.61
TWN-65 duplicat ofTWN-1 1.48
DRC split of TWN-1 1.6
DRC duplicate ofTWN-1 0.22 lstQtr I 1/14/2014 1.47 2nd Qtr 5/6/2014 1.63 3rd Qtr 8/5/2014 1.7
TWN-65 duplicate ofTWN-1 1.4 4th Qtr I 10/8/2014 1.46 lstQtr I 2/18/2015 1.37
TWN-65 dup ofTWN-1 1.41 2nd Qtr 5/13/2015 0.65 3rd Qtr 8/25/2015 0.624 4thQtr 10/13/2015 1.35 lstQtr 2/23/2016 1.51 2nd Qtr 5/17/2016 1.73 3rd Qtr 7/20/2016 1.76 4thQtr 10/6/2016 1.98 lstQtr 2/15/2017 2.06
TWN-65 duplicate of TWN-1 1.98 2nd Qtr I 6/1/2017 1.89
TWN-65 duplicate of TWN-1 1.88 3rd Qtr I 7/19/2017 2.07
TWN-65 duplicate ofTWN-1 1.89 4thQtr I 10/4/2017 1.95
TWN-6S duplicate ofTWN-1 1.99 lstQtr 1/18/2018 1.86 2nd Qtr 5/8/2018 1.89 3rd Qtr 8/8/2018 1.97 4thQtr 11/20/2018 1.98 lstQtr 2/20/2019 2.1 2nd Qtr 5/29/2019 1.93 3rd Qtr 8/14/2019 2.15 4thQtr 10/16/2019 2.35
OWMRC split ofTWN-1 2.1 lstQtr 1/29/2020 2.24 2nd Qtr 5/20/2020 2.24 3rd Qtr 7/15/2020 2.36 4thQtr 11/12/2020 1.89 lstQtr 2/17/2021 2.53 2nd Qtr 5/25/2021 3.18 3rd Qtr 8/18/2021 2.47 4thQtr 11/23/2021 1.91 lstQtr 2/15/2022 3.01 2nd Qtr 5/24/2022 2.1 3rd Qtr 8/17/2022 2.94 4th Qtr 10/25/2022 2.75 lstQtr 2/21/2023 1.96 2nd Qtr 6/8/2023 2.6
White Mesa Uranium Mill
TWN-2 (Pumping well st;irting in
January2013)
Sampling Event Chloride (mg/I) NoGWQS 17 1st Qtr 3/24/2010 20 2nd Qtr 6/2/2010 19 3rd Qtr 9/29/2010 14 4th Qtr 12/9/2010 17 1st Qtr 2/1/2011 19 2nd Qtr 4/28/2011 14 3rd Qtr 7/28/2011 10 4th Qtr 10/20/2011 15 lstQtr 1/12/2012 17 2nd Qtr 4/20/2012 -------�----.. -ii31/2012 17 3rd Qtr 17.5 4th Qtr 7/17/2012 --------------ii19/2013 17.6 lstQtr 17.4 2nd Qtr 4/24/2013 24.1 3rd Qtr 8/27/2013 26.8 4th Qtr 7/16/2013 27.1 DRC split ofTWN-2 30 30 29.2 lstQtr 1/13/2014 31.1 2nd Qtr 5/7/2014 28 3rd Qtr 8/6/2014 28 27.6 4thQtr 10/8/2014 27.8 lstQtr 2/18/2015 29.0 29.2 2nd Qtr 5/12/2015 33.2 3rd Qtr 8/25/2015 27.7 4th Qtr 10/14/2015 30.3 lstQtr 2/23/2016 32.1 2nd Qtr 5/17/2016 29.6 3rd Qtr 7/20/2016 33 4th Qtr 10/11/2016 31.2 lstQtr 2/15/2017 31.5 32.7 2nd Qtr I 6/1/20171 31.5 31.2 3rd Qtr I 7/19/20171 31.4 30.8 4thQtr I 10/4/20171 32.0 30.4 lstQtr 1/19/2018 28.4 2nd Qtr 5/9/2018 34.2 3rd Qtr 8/8/2018 28.9 4th Qtr 11/20/2018 31.4 lstQtr 2/20/2019 32.6 2nd Qtr 5/29/2019 30.3 3rd Qtr 8/14/2019 32.0 4th Qtr 10/16/2019 31.0 DWMRC split ofTWN-2 33.8 1st Qtr 1/29/2020 33.0 2nd Qtr 5/20/2020 30.8 3rd Qtr 7/15/2020 29.2 4thQtr 11/12/2020 34.1 lstQtr 2/18/2021 34.7 2nd Qtr 5/25/2021 35.7 3rd Qtr 8/18/2021 37.4 4thQtr 11/23/2021 35.6 1st Qtr 2/15/2022 33.7 2nd Qtr 5/24/2022 36.7 3rd Qtr 8/17/2022 30.1 4th Qtr 10/25/2022 30.8 lstQtr 2/21/2023 36.1 2nd Qtr 6/8/2023
Shaded= Nitrate, Nitrate + Nitrite concentrations greater than the Ground Water Quality Standard of 10 mg/I
DRC = Utah Division or Radiation Control.
DWMRC = Utah Division of Waste Management and Radiation Control
Nitrate Pumping System Started in January 2013
As of March 2012 both north and south wild life ponds no longer receiving water,
Parameter
GWQS
Nitrate, Nitrate + Nitrite Chloride (mg/I) (10 mg/L) NoGWQS 62 8� 69 97 69 104 48 93 43 93 40 85 33 74 33 76 31 86 48 103 ------------�------__________ 2��L _____ ]� 57.3 80.5 57.7 82.1 80.0 75.9 111 70.4 200 75
42.6 72.4 44.7 84.9 42 80
71 81 48.6 87.8 52.8 83.6 49.7 87.8 45 74.9 86.3 73.9 45.4 74.5 35.3 68.8 32.6 69.8 27.4 65.8 25.ol 61.5 23.91 64.2 31.91 60.5 19.6 57.1 19.8 62.3 18.6 61.5 19.6 56 19.0 50.7 45.1 102 23.2 50.7 18.2 53 16.0 52 16.5 66.1 16.l 59.6 17.2 55.6 12 53.5 15.4 61.8 13.8 61.5 15.3 58.9 12.7 62.3 15.3 59.5 14.0 60.2 13.9 61.8 14.0 48.9 11.2 44.9 13.6 49.7
Table 2 of 16 Historic Nitrate, Nitrate + Nitrite and Cloride Concentrations in Monitor Wells Up to the 2nd Quarter 2023 Nitrate Contamination Investigation White Mesa Uranium Mill
IVVN-3 Parameter TWN-4 Parameter
Sampling Event GWQS
lstQtr 2nd Qtr 13rd Qtr 14th Qtr lstQtr 12nd Qtr 3rd Qtr 4th Qtr lstQtr 2_!!'!._C!!_r __ 3rd Qtr
Nitrate, Nitrate + Nitrite (10 mg/L) 3/25/2010 25.3 6/3/2010 26 7/16/2010 27 12/10/2010 24 2/1/2011 24 4/28/2011 26 7/29/2011 25 10/20/2011 25 1/12/2012 25 4/20/2012 24 -----------------
Chloride (mg/I) NoGWQS 111 118 106 117 138 128 134 129 143 152 -------158 149 4th Qtr -----
7/31/201j 27 10/17/2012 ----------121 1--------lstQtr 2nd Qtr 3rd Qtr 4thQtr lstQtr 2nd Qtr 3rd Qtr 4th Qtr lstQtr 2nd Qtr 3rd Qtr 4th Qtr lstQtr 2ndQtr 3rd Qtr 4th Qtr lstQtr 2nd Qtr 3rd Qtr 4thQtr lstQtr 2nd Qtr 3rd Qtr 4th Qtr lstQtr 2nd Qtr 3rd Qtr 4thQtr
2/19/2013 22 2 4/24/2013 27.2 8/28/2013 20.9 10/17/2013 23.5 1/15/2014 19.6 5/7/2014 23.6 8/6/2014 19.5 10/9/2014 19.1 2/19/2015 19.4 5/14/2015 17.2 8/26/2015 16.2 10/14/2015 16.3 -----------------------------------2/24/2016 16.8 5/18/2016 13.5 7/20/2016 16.8 10/7/2016 15.8 2/16/2017 17.4 6/2/2017 15.9 7/20/2017 15.9 10/4/2017 15.6 1/19/2018 14.4 5/9/2018 16.4 8/9/2018 19.4 11/21/20181 20.11 2/21/2019 20.7 5/30/2019 18.7 8/15/2019 19.8 10/17/2019 19.6
DWMRC split of TWN-3 17.0
lstQtr I 1/30/2020;1 19.4:1 2nd Qtr 5/21/2020 24 3rd Qtr I 7/15/20201 22 21 4th Qtr 11/13/2020 18 lstQtr 2/18/2021 23.8 2nd Qtr 5/27/2021 25 3rd Qtr 8/19/2021 24.3 4th Qtr 11/24/2021 17.4 lstQtr 2/16/2022 25.3 2nd Qtr 5/25/2022 24 3rd Qtr 8/18/2022 28.2 4thQtr 10/26/2022 26 lstQtr 2/22/2023 28 2nd Qtr 6/9/2023 26.4
157 158 171 163 160 168 174 153 164 141 156 129 ----------------128 116 110 113 113 108 106 111 107 115 149 123 140 137 133 126 130
156 136 130 137 145 156 146 147 140 157 163 156 109.0 158
Sampling Event
lstQtr 3/16/2010 2nd Qtr 5/27/2010 3rd Qtr 9/27/2010 4th Qtr 12/8/2010 lstQtr 1/25/2011 2nd Qtr 4/20/2011 3rd Qtr 7/26/2011 4thQtr 10/18/2011 lstQtr 1/9/2012 2nd Qtr 4/18/2012 ._ _________ TWN-65 duplicate of TWN·4 3rd Qtr I 7/25/2012
TWN-65 duplicate ofTWN-4 �th Qtr _ 1 _ 7/15/2012 1st Qtr 2/18/2013
TWN-65 duplicate oflWN-4 2nd Qtr I 4/23/2013 3rd Qtr 8/27/2013
TWN-65 duplicate ofTWN-4 4th Qtr I 7/16/2013
TWN-65 duplicate ofTWN-4 lstQtr I 1/14/2014
TWN-65 duplicate ofTWN-4 2nd Qtr I 5t6t2014
TWN-65 duplicate ofTWN-4 3rd Qtr 8/5/2014 4thQtr 10/8/2014 lstQtr 2/18/2015 2nd Qtr 5/13/2015 3rd Qtr 8/25/2015
TWN-65 duplicate ofTWN-4 4th Qtr I 10/13/2015
TWN-65 duplicate ofTWN-4 lstQtr 2/23/2016 2nd Qtr 5/17/2016 3rd Qtr 7/20/2016 4th Qtr 10/6/2016 lstQtr 2/15/2017 2nd Qtr 6/1/2017 3rd Qtr 7/19/2017 4th Qtr 10/4/2017 lstQtr 1/18/2018 2nd Qtr 5/9/2018 3rd Qtr 8/8/2018
TWN-65 duplicate of TWN-4 4th Qtr I 1112012018
TWN-6S duplicate of TWN-4 lstQtr 2/20/2019 2nd Qtr 5/29/2019 3rd Qtr 8/14/2019 4th Qtr 10/16/2019
TWN-65 duplicate of TWN-4
DWMRC split of TWN-4
TW4-40 DWMRC duplicate ofTWN-
4 lstQtr I 1/29/2020 2nd Qtr 5/20/2020
TWN-65 duplicate ofTWN-4 3rd Qtr I 7/15/2020
TWN-65 duplicate of TWN-4 4th Qtr 11/12/2020 lstQtr 2/17/2021 2nd Qtr 5/25/2021 3rd Qtr 8/18/2021 4th Qtr 11/23/2021
TWN-65 duplicate ofTWN-4 lstQtr 2/16/2021 2nd Qtr 5/25/2022 3rd Qtr 8/18/2022 4thQtr 10/25/2022 lstQtr 2/21/2023 2nd Qtr 6/8/2023
TWN-65 duplicate of TWN-4
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 hfe ponds no longer receiving water.
GWQS
Nitrate, Nitrate + Nitrite Chloride (mg/I) (10 mg/L) NoGWQS 0.9 22 1.0 22 0.9 19 1.0 21 0.9 21 0.9 21 1.1 35 0.9 20 0.9 20 1.1 24 ------------�-------1.1 24 1.4 25 1.5 26 1.45 '------�-� ------------1.5 25.3 1.5 25.9 1.63 24.4 1.6 27.2 1.57 29.0 1.69 29.4 0.22 32 1.41 28.4 1.33 26.4 1.55 29.6 1.54 26.6 2.0 28
1.44 30.7 1.48 31.5 0.733 31.9 0.974 35.2 1.160 35.2 1.58 28.4 1.45 25.6 ---------2.02 30.7 2.97 31.7 3.14 28.0 3.09 31.3 2.63 31.2 2.4 28.6 2.35 28.0 2.27 27.4 2.63 31.2 1.9 27.7 1.54 28 1.51 27.6 1.48 22.7 1.51 23.2 1.53 25.3 1.5 26.5 1.81 23.7 2.15 25.4 2.15 24.7 1.9 26.0 1.9 26.0 1.89 27.2 1.75 25.1 1.71 25.4 1.75 23.1 1.73 23.1 1.18 22.8 1.64 24.2 1.70 23.2 1.28 23.7 1.18 23.2 1.02 23.2 1.5 22.7 1.20 20.9 1.39 21.6 1.31 21.2 0.904 12.2 1.21 15.9 1.13 18.8
Table3 of 16 Historic Nitrate, Nitrate+ Nitrite and aoride Concentrations in Monitor Wells Up to the 2nd Quarter 2023
Nitrate Contamination Investigation
TWN-5
Sampling Event
Parameter
GWQS
Nitrate, Nitrate + Nitrite (10 mg/L)
White Mesa Uranium Mill
Chloride (mg/I)
NoGWQS
TWN-4;
Sampling Event
Parameter
GWQS
Nitrate, Nitrate + Nitrite (10 mg/L)
Chloride (mg/I)
NoGWQS
lstQtr. 3/16/2010 .43 1st Qtr 3/23/2010 19 • 5/26 •• •• ............... 4.i 2nd Qtr 6/1/2010 22 2nd Qtr. 3rd Qtr .4.3 3rd Qtr 7/13/2010 73
4th Qtr .�_.._ ________ +-_____ 45_.4th Qtr 12/7/20101--------=+------=2=111 1st Qtr . 4.7 1st Qtr 1/26/2011 18
2nd qu . . . .. 44 2nd Qtr 4/20/2011 22
3rd Qtr 7 44 3rd Qtr 7/27/2011 17
4th Qtr 10 ==1---------+------4_5'-l4th Qtr 10/18/20111-----------'-'-'--------"'' 1st Qtr 45 1st Qtr 1/10/2012 .
2nd .. Cltr •• •• •• • .• 4(lsiioii .• •0.3 ............... 3.9. 2nd Qtr 4/18/2012
3rd Qtr /24/2012 .. 4.8. 3rd Qtr 7/25/2012
ll-4'-'th"-"Q"-tr __ ====f-"'.c.._-------'-----4c.c3.cc.5'-l4-'-t"'h-'Q;,ctc..r -�-7/15/2012
1st Qtr .. . .. ... 1.st Qtr 2013 . . NA
1�2_n_d_Q�tr _____ ___,�--------,-,---------12nd qtr 2013
TWN-5 abandoned on July 31, 2013 3rd Qtr .2013.
4th Qtr 2013 1st qtr2014 .
2nd Qtr 2014 3rd Qtr 2014
4th Qtr 2014
1st Qtr 2015 .
2nd Qtr 2015
3rd Qtr 2015
4th Qtr 2015
1st. qtr 2016 2nd (ltr 2016 3rd Qtr 20.16
4th Qtr 2016 .1 st Qtr 20.17 .....
2nd (ltr 2017 . 3rd qtr2017
NA
NA
4th .. Otr-=2:::01:.:7-___ -i.;.:::.:_ _____________ -II 1st qtrW18 .. z.n.d qtr 201.8 ....
3rd qtr20l8
4th Qtr 2018
1st Qtr .2019 ..... 2nd Qtr 2019
3.r.d. Qtr .2019.
4th Qtr 2019 1st qtr 2020 ... . z.n.d qtr 20.2.03r.d Qtr 20.20 ..
4th Qtr 2020 1st Qtr .2.0.21 ...
2nd (ltr 2021 . 3rd Qtr .2.0.21 ..
4th Qtr 2021
1st qtr 2022 .. 2.nd Cl.tr 2022 .
3rd qtr 2022
4th Qtr 2022 1st Qtr 2023 ind titr2023
Table4of16 Historic Nitrate, Nitrate + Nitrite and Cloride Concentrations in Monitor Wells Up to the 2nd Quarter 2023 Nitrate Contamination Investigation
TWN-7 Parameter Sampling Event GWQS
lstQtr 2nd Qtr 3rd Qtr 4th Qtr lstQtr 2nd Qtr 3rdQtr 4th Qtr lstQtr 2nd Qtr -----3rdQtr 4th Qtr -----lstQtr 2ndQtr
Nitrate, Nitrate + Nitrite (10 mg/L) 3/17/2010 0.8 5/28/2010 1.2 7/14/2010 1.8 12/10/2010 1 1/27/2011 1.3 4/21/2011 1.7 7/29/2011 0.7 10/19/2011 2.2 1/11/2012 2.3 4/20/2012 1.2 7/26/201�-0.9 10/16/2012 ----------0.64 2/19/2013 0.59 4/24/2013 1.16
White Mesa Uranium Mill TWN-8 Sampling Event Chloride (mg/I) NoGWQS 6 1st Qtr 3/16/2010 6 2nd Qtr 5/26/2010 7 3rd Qtr 7/12/2010 4 4th Qtr 12/7/2010 6 lstQtr 1/25/2011 6 2nd Qtr 4/19/2011 5 3rd Qtr 7/26/2011 6 4th Qtr 10/17/2011 5 lstQtr 1/9/2012 6 2nd Qtr 4/18/2012 -------1----·-----6 5.67 -------5.68 5.88
3rd Qtr 7/24/2012 4th Qtr 10/15/2012 1.., ___ • -----lstQtr 2013 2nd Qtr I 2013
Parameter GWQS Nitrate, Nitrate + Nitrite Chloride (mg/I) (10 mg/L) NoGWQS <0.1 11 <0.1 11 <0.1 11 <0.1 9 <0.1 13 <0.1 10 <0.1 18 <0.1 10 <0.1 11 <0.1 15 -------------------<0.1 L 11 <0.1 ----------_____ 11,!NA NA 3rdQtr 8/28/2013 0.835 6.96 TWN-8 abandoned on July 31, 2013 4th Qtr lstQtr 2nd Qtr 3rd Qtr 4th Qtr 1st Qtr 2ndQtr 3rdQtr 4th Qtr _____ lstQtr 2ndQtr 3rdQtr 4th Qtr lstQtr 2nd Qtr 3rd Qtr 4th Qtr lstQtr 2nd Qtr 3rd Qtr 4th Qtr lstQtr 2nd Qtr 3rd Qtr 4th Qtr
10/16/2013 1/15/2014 5/7/2014 8/6/2014 10/9/2014 2/19/2015 5/14/2015 8/6/2015 10/14/2015 2/24/2016 5/18/2016 7/21/2016 10/7/2016 2/16/2017 6/2/2017 7/20/2017 10/5/2017 1/19/2018 5/9/2018 8/9/2018 11/21/2018 2/21/2019 5/30/2019 8/15/2019 10/17/2019
DWMRC split of TWN· 7 lstQtr 1/30/2020 2ndQtr 5/21/2020 3rd Qtr 7/16/2020 4th Qtr 11/13/2020 lstQtr 2/18/2021 2nd Qtr 5/27/2021 3rd Qtr 8/19/2021 4th Qtr 11/24/2021 lstQtr 2/17/2022 2ndQtr 5/25/2022 3rd Qtr 8/18/2022 4th Qtr 10/26/2022 lstQtr 2/22/2023 2ndQtr 6/9/2023
0.986 5.7 0.882 5.75 0.564 5.26 0.9 6 0.968 5.93 1.04 5.58 0.779 6.18 0.348 6.12 0.672 5.84 --------------------------------------------------------0.24 6.06 0.732 6.26 0.81 5.97 0.698 6.17 1.63 14.0 3.74 29.7 2.7 29.0 3.58 41.4 5.82 69.4 10.2 94.7 10.6 105 11.5 104 12.9 107 13.5 122 12.9 120 14.5 119 12.0 120 14.2 128 14.6 126 15.2 116 11.8 121 16.0 129 16.4 129 15.1 121 7.66 130 16.9 120 16.0 127 14.6 128 15.7 129 14.5 150 14.0 122
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 1n January 2013
As of March 2012 both north and south wild life ponds no longer rece1v1ng water.
Table Sot 16
Historic Nitrate, Nitrate + Nitrite and Cloride Concentrations in Monitor Wells Up to the 2nd Quarter 2023
Nitrate Contamination Investigation
White Mesa Uranium Mill
TWN-9 Parameter TWN-10 Parameter
Sampling Event GWQS Sampling Event GWQS
Nitrate, Nitrate + Nitrite Chloride (mg/I) Nitrate, Nitrate + Nitrite
(10 mg/L) NoGWQS (10 mg/L)
lstQtr 3/23/2010 7.6 183 lstQtr 3/23/2010 1.5
2nd Qtr 6/1/2010 7.7 175 2nd Qtr 6/2/2010 1.0
3rd Qtr 7/15/2010 10.7 210 3rd Qtr 7/14/2010 0.2
4th Qtr 12/9/2010 8.0 172 4th Qtr 12/8/2010 1.3
lstQtr 2/1/2011 9.5 217 lstQtr 1/26/2011 0.3
2nd Qtr 4/28/2011 10.0 192 2nd Qtr 4/21/2011 1.2
3rd Qtr 7/29/2011 11.0 208 3rd Qtr 7/27/2011 0.1
4thQtr 10/20/2011 10.9 134 4thQtr 10/18/2011 0.2
lstQtr 1/12/2012 12.2 202 lstQtr 1/10/2012 0.8
TW4·6S dup of TWN-10 0.7
2nd Qtr 4/20/2012 10.6 209 2nd Qtr 4/19/2012 0.9
3rd Qtr 7/31/2012 12.3 215 3rd Qtr 7/25/2012 0.6
4th Qtr 10/17/2012 12.5 194 4thQtr 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
IWN-11 Parameter TWN-12 Parameter
Sampling Event GWQS Sampling Event GWQS
Nitrate, Nitrate+ Nitrite Chloride (mg/I) Nitrate, Nitrate + Nitrite
(10 mg/L) NoGWQ5 (10 mg/L)
lstQtr 3/17/2010 1.4 73 lstQtr 3/17/2010 0.7
2nd Qtr I 6/1/2010 1.3 72 2nd Qtr 5/26/2010 0.8
3rd Qtr 9/27/2010 1.4 76 3rd Qtr 7/12/2010 0.7
4th Qtr 12/8/2010 1.4 72 4th Qtr 12/7/2010 0.7
lstQtr 1/27/2011 1.4 84 1st Qtr 1/26/2011 4.2
2nd Qtr I 4/26/2011 1.4 76 2nd Qtr 4/26/2011 1.0
3rd Qtr 7/27/2011 0.1 76 3rd Qtr 7/26/2011 0.6
4thQtr 10/17/2011 1.6 76 4th Qtr 10/17/2011 1.2
lstQtr 1/10/2012 1.6 69 lstQtr 1/10/2012 0.9
ate of TWN-11 1.6 70
2nd Qtr I 4/19/2012 1.6 71 2nd Qtr 4/18/2012 1.2
3rd Qtr 7/25/2012 1.8 77 3rd Qtr 7/25/2012 1.4
4th Qtr 10/16/2012 1.84 76.4 4th Qtr 7/16/2012 1.41
1st Qtr 2013 NA 1st Qtr 2013 NA
2nd Qtr 2013 NA 2nd Qtr 2013 NA
TWN-11 abandoned on July 31, 2013 TWN-12 abandoned on July 31, 2013
Shaded = Nitrate, Nitrate+ N1tnte 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
Table6of 16 Historic Nitrate, Nitrate+ Nitrite and Cloride Concentrations in Monitor Wells Up to the 2nd Quarter 2023 Nitrate Contamination Investigation
TWN-13 Sampling Event
1st Qtr 3/17/2010 2nd Cl.tr.. • • 5/26/ioio3rd Qtr .. . 9/i7/2 • 4thQtr iinh 1st Qtr 1/25/2 2riiqtr 4;ii,ii
Parameter GWQS
White Mesa Uranium Mill
TWN-14 Sampling Event
3rd Qtr ijish 4th Qtr • 10/i1.c:i2:.:· =i.==-----------!-----..:.::i-:.::.:..::,:=-----1-= lfl_s_t .-Cl.t�r-.. -t--"1/9/2 2nd Qtr .. • • 4/is/i3rd Qtr 7/24
4th Qtr 1st (ltr 2nd Qtr
NA= Per the CAP and SCO, not sampled
3rd Qtr iithcitr
3rd(ltr .. 4th Qtr
3rd (ltr 4th Qtr
Parameter GWQS Nitrate, Nitrate + Nitrite (10 mg/L) Chloride (mg/I) NoGWQS 24 30 26 28 24 30
Table7 of 16
Historic Nitrate, Nitrate+ Nitrite and Clorlde Concentrations in Monitor Wells Up to the 2nd Quarter 2023
Nitrate Contamination Investigation
White Mesa Uranium Mill
Sampling Event
Parameter
GWQS TWN -16 Sampling Event
arameter
GWQS
Nitrate, Nitrate + Nitrite (10 mg/L) Chloride (mg/I) NoGWQS Nitrate, Nitrate + Nitrite (10 mg/L) Chloride (mg/I) NoGWQS 3/18/2 0. 7 __ 4:3 1st Qtr 3/17/2010 1.2 35
5/28 5/27/2010 .. -1:i ............... 35 9/27/2010 2.6 35
----<---------1-------+-�----<-t.�----<---------1------3---10, 27 34 27 39 7/28/ 27 31 •• • • • 10/19/2 18_--+---------+------34_,, 1/11/.,-2--+----------;------t---c�--t-� 10 33 nd Qtr 4/20/2012 1.6 46 ?ridgtr 4/19 .. 50
TW4-70duplicate�f1WN-15 1.7 46 :i�;·· ·-1· 1iii)i�n /�! ·:j :i�i:;TW4-70duplicateof1WN-15 2.0 44.4
1st Qtr 2013 NA 2nd Qtr 2013 NA TWN-15 abandoned on July 31, 2013
NA= Per the CAP and SCO, not sampled
3rdQtr
4th Qtr lstQtr ..
2ndgtr ... 3rdQtr_ 4th Qtr lst(ltr_
2_n_d_Cl.tr __ _ 3rdQtr 4th Qtr
1st Qtr .. . 2nd_O,tr .. . 3rd Qtr 4th Qtr 1st Cl.tr.
2nd Cl.tr .. 3rd Qtr
4th Qtr 1st Qtr 2nd Qtr
3rdQtr_ 4th Qtr
1st Qtr 2nd Cl.tr_. 3rdQtr.
4th Qtr
_l_s_t __ Cl.tr __ 2nd(ltr 3rd Qtr
4th Qtr 1st Qtr indoi:,
3rdQtr 4th Qtr 1st Qtr 2nd (ltr
3rdQtr 4th Qtr 1st Qtr iii,foi:,
2.50
2019 NA
33
32.1
Table 8 of 16 Historic Nitrate, Nitrate+ Nitrite and Cloride Concentrations in Monitor Wells Up to the 2nd Quarter 2023
Nitrate Contamination Investigation
TWN-17 Parameter
Sampling Event GWQS
lstQtr 2nd Qtr 3rdQtr 4th Qtr lstQtr 2ndQtr 3rdQtr 4th Qtr stQtr 'ndQtr -----3rd Qtr4th Qtr -----lstQtr 2nd Qtr
3rd Qtr
Nitrate, Nitrate + Nitrite (10 mg/L) 3/24/2010 10.4 6/3/2010 11 7/15/2010 8.9 12/10/2010 8 2/1/2011 8.6 4/28/2011 9 7/29/2011 8.5 10/20/2011 8.1 1/12/2012 8.7 4/20/2012 9.1 -----------------7/27/201� 9.5 10/17/2012 ----------9.65 2013 NA 2013 NA
2013 NA TWN-17 abandoned on July 31, 2013
NA= Per the CAP and SCO, not sampled
White Mesa Uranium Mill
TWN-18
Sampling Event
Chloride (mg/I) NoGWQS 78 1st Qtr 3/17/2010 87 2nd Qtr 6/1/2010 66 3rd Qtr 9/27/2010 65 4th Qtr 12/9/2010 90 lstQtr 1/27/2011 81 2nd Qtr 4/26/2011 74 3rd Qtr 7/28/2011 71 4th Qtr 10/18/2011 79 lstQtr 1/10/2012 80 2nd Qtr 4/19/2012 -------�-----ii26/2012 85 3rd Qtr 84.8 4th Qtr 7/16/2012 -------------2/18/2013 lstQtr 2nd Qtr 4/23/2013
TW4-6S dup ofTWN•18 3rd Qtr 8/27/2013 4th Qtr 10/16/2013
DRC split sample lstQtr 2/14/2014 2nd Qtr 5/6/2014 3rd Qtr 8/5/2014 4th Qtr 10/8/2014
TW4-65 dup ofTWN-18 lstQtr I 2/18/2015 2nd Qtr 5/13/2015
TW4-65 dup ofTWN-18 3rd Qtr I 8/25/2015 4th Qtr 10/13/2015
TW4-65 dup ofTWN-18 lstQtr 2/23/2016 2nd Qtr 5/17/2016 3rd Qtr 7/21/2016 4th Qtr 10/6/2016 lstQtr 2/15/2017 2nd Qtr 6/1/2017 3rd Qtr 7/19/2017 4th Qtr 10/4/2017 lstQtr 1/18/2018 2nd Qtr 5/8/2018 3rd Qtr 8/8/2018 4thQtr 11/21/2018 lstQtr 2/20/2019
TWN-65 dup ofTWN-18 2nd Qtr I 5/29/2019
TWN-65 dup ofTWN-18 3rd Qtr I 8/14/2019
TWN-65 dup ofTWN-18 4th Qtr I 1011612019
DWMRC duplicate ofTWN-18 lstQtr I 1/29/2020
TWN-65 dup of TWN-18 2nd Qtr I 5/20/2020 3rd Qtr 7/15/2020 4th Qtr 11/12/2020
TWN-65 dup of TWN· 18 lstQtr I 2/17/2021
TWN-65 dup ofTWN-18 2nd Qtr I 5/25/2021
TWN-65 dup ofTWN-18 3rd Qtr I 8/17/2021
TWN-65 dup ofTWN-18 4th Qtr I 11/23/2021 lstQtr I 2/15/2022
TWN-65 dup ofTWN-18 2nd Qtr I 5/24/2022
TWN-65 dup of TWN-18 3rd Qtr I 8/17/2022
TWN-65 dup ofTWN-18 4thQtr I 1012512022 lstQtr I 2/21/2023
TWN-65 dup ofTWN-18 2nd Qtr I 6/8/2023
Shaded= Nitrate, Nitrate + Nitrite concentrations greater than the Ground Water Quality Standard of 10 mg/1
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 ___ ,
Parameter
GWQS
Nitrate, Nitrate + Nitrite (10 mg/L) 1.6 1.8 1.8 1.6 1.4 1.8 1.8 1.9 1.9 2.1 ------------2.3 1.95 ------------2.27 2.32 2.46 2.04 2.15 0.29 2.33 2.18 1.8 1.47 1.47 1 1.35 <0.10 0.35 0.668 0.645 0.648 0.497 <0.100 0.501 0.47 0.392 0.419 0.256 0.332 0.283 0.348 0.16 0.155 0.174 0.129 0.152 0.181 0.184 0.162 0.13 0.224 0.249 0.223 0.232 0.208 0.171 0.228 0.227 0.22 0.247 0.199 0.2080.245 0.199 <0.1 0.34 0.3 0.328 0.349 0.212 0.253 0.1840.267
Chloride (mg/I) NoGWQS 42 63 64 59 61 67 6' 60 64 64 --------67 67.5 --------68.7 64.3 66.1 70.4 67.3 74 68.476.570 74.8 72.3 73.3 76.6 76.9 81.3 69 68.6 67.6 69.9 52.7 67.4 62.1 63.9 59.0 56.6 53.1 57.8 59.7 48.1 46.4 49.9 50.0 53.3 46.9 47.3 47.1 43.0 51.9 50.6 47.4 44.0 42.3 41.9 46.2 46.1 44.9 44.1 42.9 44.1 46.5 40.9 40.5 40.7 39.6 40.8 40.7 35.6 33.2 32.5 36.1
Table9of 16 Historic Nitrate, Nitrate+ Nitrite and aoride Concentrations in Monitor Wells Up to the 2nd Quarter 2023 Nitrate Contamination Investigation
TWN-19 Sampling Event Parameter GWQS
White Mesa Uranium Mill
Upper Wildlife Pond Sampling Event Parameter GWQS Nitrate, Nitrate + Nitrite (10 mg/L) Chloride (mg/I) NoGWQS Nitrate, Nitrate + Nitrite (10 mg/L) 1st Qtr 7.2 118 1st Cltr 3/18/2010 <0.1 2nd Qtr 6.2 ...................... .11.3. 2nd (),tr . 6/2/i.oio <O.i •• 3.rd Qtr . 9/27 7.2 ..... 1.1.3 3r�(),tr 7/i<J/ioio <0.1.
104_th_Q�t_r_+-_1�2/9/'='=2..,..,..;-________ 1_._ot-____ 10_7-t4_t_h_Q.,_tr_-+_i=2jioj;ioio <0.1 1st qtr 2/1/2011 .1 14 1st Qtr 1/31/2011 2.n.d (),tr •• •• •• •• 4/28/lOli 6.9 120 2nd. Qtr. • • • •• 4/25/2011 <0.1 3rd Qtr ••••• 7/28/2 113 .3r.d(lt.,.. • • 1j2s/2oii <O:i4th Qtr 10/i8}2 108 4th Qtr 10/19/2011 <0.1 lst_(),tr
3rdQtr 4th Qtr 1st.qt,. 2ndQtr 3r.d qt , 4th Qtr 1st Qtr .. 2nd._(ttr. 3rd (ttr .. 4th Qtr ls.t.CUr 2.n.d (),tr . 3rd(),tr. 4th Qtr lstQtr 2nd cttr ..3rd(),tr 4thQtr 1st. (ltr . 2n.d (),tr . 3r.d(),tr 4th Qtr 1st Qtr 2nd (),tr ...3r�Qtr .. 4th Qtr 1st Qtr 2nd (),tr 3rdQtr 4th Qtr lstCltr ..
3rdQtr 4th Qtr
3rdQtr 4th Qtr lst(),tr 2nd cttr ...
2013 NA 2013 NA 2014 NA 2014 NA 2014 NA 2014 NA 2015 NA 2015 NA 2015 NA 2015 NA
3rd Qtr 2022 NA 4th Qtr 2022 NA 1st Qtr 2023 NA 2nd Qtr • • • • 2023 NA
TWN-20 Sampling Event Parameter GWQS TWN-21 Sampling Event Parameter GWQS
Chloride (mg/I) NoGWQS
Nitrate, Nitrate + Nitrite (10mg/L) Chloride (mg/I) Nitrate, Nitrate+ Nitrite Chloride (mg/I) No GWQS (10 mg/L) No GWQS 2.n.d Qtr 6/3/2021 1.88 .. �o �nd cttr 6/3/2021 1.03 41.9 3rd (),tr .. 8/19/2021 0.96' 35.3 3rd Qtr . j/19(2�21 . 1.16 40.5 4th Qtr • • • ii/23/20:ii • 0.286 33.6 4th Qtr 11/23/2021 0.696 42.6 1st Cltr 2/16/c.2_0 -22-+---------0 -.4-3-6t-----3-l.-.2-tl-s-t __ Q.,,.tr-. --+--�_2/16/.,... 2-02-.2➔. --------l-.-lt-----4-0 -.4�1
2nd (ttr sjisjiiJ22 0.54 29.7 2nd Qtr 5/25/2022 1.1 39.8 3rd Qtr • • sjis/2022 . 0.48 32:4 3rd Qtr 8/18/2022 1.19 42. 7 4th Qtr 10/26/2022 0.446 32.0 4th Qtr • io/26/""2"'02cc2+·--------'-1._08'+-____ 4�2_.3,1 1st Qtr 2/22/2023 0.356 23.2 1st Qtr 2/22/2023 1.02 27.5 2nd Qtr 6f9{2023 0.36 ii :irifotr 6/9/20231 1.0 29.8
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 2nd Quarter 2023 Nitrate Contamination Investigation White Mesa Uranium Mill
Pizometer 1 Parameter Pizometer 2 Parameter
Sampling Event GWQS
2nd Qtr 3rd Qtr 4th Qtr lstQtr 2nd Qtr 3rd Qtr 4th Qtr lstQtr lstQtr 2nd Qtr -----3rd Qtr 4thQtr -----lstQtr 2nd Qtr
3rd Qtr 4th Qtr
DRC split of Piez-1 lstQtr 2nd Qtr 3rd Qtr 4th Qtr
lstQtr 2nd Qtr 3rd Qtr 4th Qtr lstQtr
2nd Qtr 3rd Qtr 4thQtr lstQtr 2nd Qtr 3rd Qtr 4th Qtr lstQtr 2nd Qtr 3rd Qtr 4th Qtr lstQtr 2nd Qtr 3rd Qtr 4th Qtr
Nitrate, Nitrate + Nitrite (10 mg/L) 6/2/2010 7.2 7/19/2010 6.8
12/10/2010 6.5 1/31/2011 7
4/25/2011 6.8 7/25/2011 7
10/19/2011 6.6 1/11/2012 7.1
1/10/2012 7.0 4/20/2012 6.6
7/27/201-�-
-----7.2 10/17/2012 ----------7.66 2/19/2013 8.11 4/24/2013 8.888/28/2013 7.83 10/16/2013 6.68
1.3
1/13/2014 6.79 5/7/2014 7.57
8/6/2014 5.1 10/8/2014 5.75
2/18/2015 6.415/12/2015 5.95 8/26/2015 4.96
10/14/2015 6.17------------------2/23/2016 8.31
5/12/2016 6.337/19/2016 6.78 10/11/2016 6.42
2/15/2017 6.75 6/1/2017 6.6
7/20/2017 6.8 10/4/2017 6.21
1/17/2018 6.35 5/9/2018 6.56 8/8/2018 6.66
11/21/2018 6.72/19/2019 6.72
5/30/2019 6.758/14/2019 6.81
10/16/2019 7.21
DWMRC duplicate of P-1 6.4
lstQtr 1/30/2020 7.12
2nd Qtr 5/20/2020 6.953rd Qtr 7/15/2020 7.36
4th Qtr 11/13/2020 7.51 stQtr 2/18/2021 7.34
nd Qtr 5/27/2021 7.89 rd Qtr 8/19/2021 7.6
thQtr 11/23/2021 4.69 lstQtr 2/16/2022 7.4
2nd Qtr 5/24/2022 5.9
3rd Qtr 8/17/2022 6.374th Qtr 10/25/2022 6.36
lstQtr 2/21/2023 5.34
2nd Qtr 6/8/2023 5.9
DRC = Utah Division of Radiation Control
Nitrate Pumping System Started in January 2013 ______ •
Sampling Event Chloride (mg/I) NoGWQS 52 2nd Qtr 52 3rd Qtr 60 4th Qtr 60 lstQtr 58 2nd Qtr53 3rd Qtr 55 4th Qtr 78 lstQtr 114 lstQtr 58 2nd Qtr �------------56 3rd Qtr 55 4thQtr ------------56.7 lstQtr 53.3 2nd Qtr 55.1 3rd Qtr 54.1 4th Qtr
60 ORC split of Piez-2 56.2 lstQtr 52.1 2nd Qtr 55 3rd Qtr 57.6 55.9 57.5 64.2 54.4 ---------------------56.5 59.1 53.9 58.1 54.5 54.7
4th Qtr lstQtr
2nd Qtr 3rd Qtr 4th Qtr ______ lstQtr 2nd Qtr 3rd Qtr 4thQtr lstQtr 2nd Qtr 58 3rd Qtr 54.4 4th Qtr 55.3 lstQtr
58 2nd Qtr 63.5 3rd Qtr 55.5 4thQtr 56.8 lstQtr 59.4 2nd Qtr 61.1 3rd Qtr 59.3 4th Qtr
6/2/2010 7/19/2010
12/10/2010 1/31/2011 4/25/20117/25/2011 10/19/2011 1/11/2012 1/31/20124/20/2012 -ii27/20127/17/2012 -
ii19/20134/24/2013 8/28/201310/16/2013
1/13/2014 5/7/2014 8/6/2014
10/8/2014 2/18/20155/12/2015 8/6/201510/14/2015 2/23/2016 5/12/2016 7/19/2016 10/11/20162/15/2017 6/1/2017 7/20/2017
10/4/2017 1/17/2018 5/9/2018 8/8/201811/20/2018 2/19/2019 5/30/2019
8/14/201910/16/2019
60 OWMRC duplicate of P-2 68.9 lstQtr 1/30/2020 67.7 2nd Qtr 5/20/2020
63.6 3rd Qtr 7/15/202063.9 4th Qtr 11/13/2020
57.5 lstQtr 2/18/202169.9 2nd Qtr 5/27/2021
70 3rd Qtr 8/19/202165.5 4thQtr 11/23/202168.8 lstQtr 2/16/2022 70.3 2nd Qtr 5/24/202272 3rd Qtr 8/17/2022
73.6 4thQtr 10/25/202250.8 lstQtr 2/21/2023 65.1 2nd Qtr 6/8/2023
As of March 2012 both north and south wild life ponds no longer receiving water ___ ,
GWQS Nitrate, Nitrate + Nitrite Chloride (mg/I) (10 mg/L) NoGWQS 0.6 8 0.6 8 0.2 6 0.3 90.3 8 0.1 9 0.1 8 0.1 9 0.1 10.2 ------------�-------0.2 9 0.19 9.5 ------------1....-------0.22 9.670.172 10.3 0.198 9.66 0.36 9.22 0.27 11 0.169 11.4 0.736 11.4 0.8 12 0.755 12.20.749 12.S 0.646 13.1 0.7 15.5 0.692 13.3---------------------0.615 13.40.665 14 0.669 12.4
0.732 13.4 0.696 12.40.345 13.20.555 13.4 0.684 12.7 0.716 13.0 0.776 14.0
0.818 15.1 0.648 12.30.599 12.9 0.702 12.6 0.606 13.2
0.573 12.6 0.36 21 0.740 14.2 0.679 14.4 0.793 12.7
0.544 12.9 0.401 15.7
<0.1 13.9 0.11 14.6
<0.1 14.8 0.330 14.00.48 12.6 0.71 14.7 0.703 13.4 0.607 9.80.68 12.8
Table 11 of 16 Historic Nitrate, Nitrate+ Nitrite and Cloride Concentrations in Monitor Wells Up to the 2nd Quarter 2023 Nitrate Contamination Investigation
Pizometer 3 Parameter Sampling Event GWQS
lstQtr 2nd Qtr 3rd Qtr 4thQtr lstQtr 2nd Qtr 3rd Qtr 4thQtr lstQtr 2nd Qtr 3rd Qtr 4thQtr lstQtr 2nd Qtr 3rd Qtr 4thQtr
DRC split sample lstQtr 2nd Qtr 3rd Qtr 4th Qtr lstQtr 2nd Qtr 3rd Qtr
Nitrate, Nitrate + Nitrite (10 mg/L) 3/24/2010 1.7 6/2/2010 1.6 7/19/2010 1.8 12/9/2010 1.8 1/31/2011 1.8 4/25/2011 1.7 7/25/2011 1.8 10/19/2011 1.7 1/11/2012 1.8 4/20/2012 1. 7 7/27/20121 1.8 10/17/2012 ----------2.75 2/24/2013 1.85 4/24/2013 1.83 8/28/2013 1.81 10/16/2013 1.8 0.33 1/13/2014 1.7 5/7/2014 1.79 8/6/2014 1.7 10/8/2014 1.74 2/18/2015 1.82 5/12/2015 1.75 8/26/2015 1.87
White Mesa Uranium Mill
Pizometer 3A Parameter Sampling Event GWQS Chloride (mg/I) Nitrate, Nitrate + Nitrite NoGWQS (10 mg/L) 116 36 35 25 40 35 61 12 20 53 21 20.1 21 21.2 22.4 23.5 27 26 23.9 26 28.3 27.3 30.2 54.8
Chloride {mg/I) NoGWQS
4th Qtr _____ 10/14/2015 2.24 39.5 New piezometer P-3A to replace piezometer P-3 drilled and installed in lstQtr 2/23/2016 1.82 27.3 Pizometer-3 abandonded May 2016 (1)2nd Qtr 3rd Qtr 4th Qtr lstQtr 2nd Qtr 3rd Qtr 4th Qtr ______ lstQtr 2nd Qtr 3rd Qtr 4th Qtr lstQtr 2nd Qtr 3rd Qtr 4th Qtr
5/12/2016 7/19/2016 10/11/2016 2/15/2017 6/1/2017 7/20/2017 10/4/2017 2/17/2018 5/9/2018 8/8/2018 11/20/2018 2/17/2019 5/30/2019 8/14/2019 10/16/2019
DWMRC duplicate of P-3a lstQtr 1/30/2020 2nd Qtr 5/20/2020 3rd Qtr 7/15/2020 4thQtr 11/13/2020 lstQtr 2/18/2021 2nd Qtr 5/27/2021 3rd Qtr 8/19/2021 4th Qtr 11/23/2021 lstQtr 2/16/2022 2nd Qtr 5/24/2022 3rd Qtr 8/17/2022 4th Qtr 10/25/2022 lstQtr 2/21/2023 2nd Qtr 6/8/2023
1. New piezometer PIEZ-3A to replace PIEZ-3 dnlled and installed m May 2016. F,rst momtonng event.
Shaded= Nitrate, Nitrate+ Nitrite concentrations greater than the Ground Water Quality Standard of 10 mg/I
0RC = 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 rece1v1ng 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 10.5 99.5 12.4 88.3 12.8 82.7 13 72.8 11.1 85.! 14.4 85.1 11.2 81.' 9.11 84.E 12.1 91� 8.8 114.C 10.6 109 11.5 81.5 11.9 60.8 11.9 82.E
Table 12 of 16
Historic Nitrate, Nitrate+ Nitrite and Cloride Concentrations in Monitor Wells Up to the 2nd Quarter 2023 Nitrate Contamination Investigation White Mesa Uranium Mill
TW4-19(Pumpinawellmrtinain Parameter TW4-20 (Pumpina well stitina fn Parameter April2003)
Sampling Event
lstQtr
2nd Qtr
3rd Qtr
4thQtr
lstQtr 2nd Qtr
3rd Qtr 4thQtr
lstQtr
2nd Qtr
3rd Qtr 4thQtr
lstQtr
2nd Qtr
3rd Qtr
4thQtr lstQtr
2nd Qtr 3rd Qtr
4th Qtr
lstQtr
2nd Qtr
3rd Qtr 4th Qtr
lstQtr 2nd Qtr
3rd Qtr 4thQtr lstQtr
2nd Qtr
3rd Qtr
4th Qtr lstQtr
2nd Qtr 3rd Qtr
4th Qtr
lstQtr 2nd Qtr
3rd Qtr 4th Qtr
lstQtr 2nd Qtr
3rd Qtr
4th Qtr _____ lstQtr
2nd Qtr 3rd Qtr
4th Qtr lstQtr
2nd Qtr 3rdQtr
4thQtr
lstQtr
2nd Qtr
3rd Qtr 4thQtr
lstQtr 2nd Qtr
3rd Qtr
4th Qtr lstQtr
2nd Qtr
3/16/2005 5/25/2005 8/31/2005
12/7/2005
3/9/2006 6/14/2006
7/20/2006 11£�/2006
2/28/2007
6/27/2007 8/15/2007
10/10/2007 3/28/2008
6/25/2008 9/10/2008
10/15/2008 3/4/2009
6/23/2009 9/14/2009
12/22/2009
2/17/2010
6/14/2010
8/16/2010 10/15/2010
2/17/2011 6/7/2011
8/17/2011
11/17/2011
6/6/2012 9/4/2012
10/3/2012 2/13/2013
6/5/2013
9/3/2013 10/29/2013
1/27/2014 5/19/2014
8/11/2014 10/21/2014
'i,79/2015
6/8/2015 8/31/2015
--10/19/2015 3/9/2016
5/26/2016
7/25/2016
10/13/2016
3/8/2017 6/13/2017
7/26/2017 10/11/2017
3/12/2018 6/8/2018
8/30/2018 11/28/2018
3/8/2019
6/5/2019 9/4/2019
12/10/2019
2/19/2020 5/27/2020
Auaust2005)
GWQS Sampling Event
Nitrate, Nitrate + Nitrite Chloride (mg/I} (10 mg/L) NoGWQS
5.3 NA 5.7 NA 2nd Qtr 5/25/2005 4.6 NA 3rd Qtr _ i!L32/.3,0.£5 <0.1 81 4th Qtr 12/7/2005
4 86 lstQtr 3/9/2006
5.2 116 2nd Qtr 6/14/2006
4.3 123 3rd Qtr 7/20/2006
4.6 134 4thQtr 11/8/2006 4 133 lstQtr 2/28/2007
not sampled 2nd Qtr 6/27/2007
4.1 129 3rd Qtr 8/15/2007
4 132 4th Qtr 10/10/2007
2.2 131 lstQtr 3/28/2008
2.8 128 2nd Qtr 6/25/2008
35.2 113 3rd Qtr 9/10/2008
47.8 124 4th Qtr 10/15/2008
3.2 127 lstQtr 3/4/2009 2.4 132 2nd Qtr 6/23/2009
<0.1 43 3rd Qtr 9/14/2009
26.7 124 4th Qtr 12/22/2009
2 144 lstQtr 2/17/2010
4.4 132 2nd Qtr 6/14/2010
5.9 142 3rd Qtr 8/16/2010
2.7 146 4th Qtr 10/15/2010
17.0 135 lstQtr 2/17/2011
12.0 148 2nd Qtr 6/7/2011
3.0 148 3rd Qtr 8/17/2011
5.0 148 4th Qtr 11/17/2011
0.6 138 lstQtr
2.4 149 2nd Qtr 6/6/2012
2.5 149 3rd Qtr 9/4/2012 4.1 150 4th Qtr 10/3/2012
8.0 164 lstQtr 2/13/2013
3.0 148 2nd Qtr 6/5/2013
17.6 179 3rd Qtr 9/3/2013
4.7 134 4th Qtr 10/29/2013
1.6 134 lstQtr 1/27/2014
152 2nd Qtr 5/19/2014
1.6 140 3rd Qtr 8/11/2014
4.7 130 4th Qtr 10/21/2014
8.56 238 lstQtr 3/9/2015
0.916 180 2nd Qtr 6/8/2015
11.6 326 3rd Qtr 8/31/2015
10.6 252 4thQtr _ 10/19/2015 ----------------15.70 276 lstQtr 3/9/2016
1.27 204 2nd Qtr 5/26/2016
10.5 214 3rd Qtr 7/25/2016
10.0 200 4th Qtr 10/13/2016
11.1 461 lstQtr 3/8/2017
0.243 135 2nd Qtr 6/13/2017
1.120 218 3rd Qtr 7/26/2017
0.377 139 4thQtr 10/11/2017
8.6 193 lstQtr 3/12/2018
0.494 138 2nd Qtr 6/8/2018
2.55 166 3rd Qtr 8/30/2018
0.233 140 4th Qtr 11/28/2018
6.6 197 lstQtr 3/8/2019
6.580 160 2nd Qtr 6/5/2019
0.33 153 3rd Qtr 9/4/2019
0.535 147 4th Qtr 12/10/2019
10.1 205 lstQtr 2/19/2020
1.140 147 2nd Qtr 5/27/2020
GWQS
Nitrate, Nitrate + Nitrite Chloride (mg/I}
(10 mg/L) NoGWQS
---------1�:!��� ----
1.80 131 3.80 120
9.40 235 2.90 134
3.50 124
4.20 124 2.30 112
2.10 117 5.60 170
0.90 132 8.00 191
4.44 156
5.51 168
5.10 164
2.90 164 3.30 153
5.30 187
2.00 179
5.60 200
5.30 196 4.60 203
4.40 220 4.80 177
6.50 207
4.20 186 7.90 207
11.00 262
10.80 289
11.00 302
9.07 252 9.80 250
8.65 260 9.64 272
7.56 254
5.95 269
4.30 299
7.67 292 9.80 290
5.76 296 9.3 365
6.23 293
10.30 293
11.2 318
11.3 307 11.4 301
12.0 290
9.76 281
108 292
8.91 293 9.5 289
10.40 258 8.14 282
9.72 295
6.7 272 9.59 279
10.2 286
9.75 307
9.81 310
7.23 301
3rd Qtr 9/4/2020 11.6 188 TW 4-20 Abandonded October 2020
4th Qtr 12/10/2020 1.1 104
lstQtr 2/23/2021 6.6 167
2nd Qtr 6/9/2021 4.04 115
3rd Qtr 8/24/2021 6.68 172
4thQtr 12/1/2021 11.1 184
lstQtr 3/9/2022 1.7 119
2nd Qtr 6/8/2022 1.4 128
3rd Qtr 8/30/2022 4.76 178
4th Qtr 11/30/2022 3.6 129
lstQtr 3/7/2023 1.8 122
2nd Qtr 6/13/2023 6.7 167
Shaded= Nitrate, Nitrate+ Nitrite concentrations greater than the Ground Water Quahty 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
Table 13 of 16
Historic Nitrate, Nitrate+ Nitrite and Cloride Concentrations in Monitor Wells Up to the 2nd Quarter 2023
Nitrate Contamination Investigation
White Mesa Uranium Mill
TW4-21 (Pumpin1 well st.1rtin1 in Parameter TW4-22 (Pumpin1 well stitin1 in
June2015) Au1ust200S)
Sampling Event GWQS Sampling Event
Nitrate, Nitrate + Nitrite Chloride (mg/I)
(10 mg/L) NoGWQS
lstQtr 3/16/2005 was not sampled lstQtr 3/16/2005
2nd Qtr
3rd Qtr
4th Qtr
lstQtr
2nd Qtr 3rd Qtr
4th Qtr
lstQtr
2nd Qtr
3rd Qtr
4thQtr
lstQtr
2nd Qtr
3rd Qtr 4th Qtr
lstQtr 2nd Qtr
3rd Qtr
4th Qtr _____ lstQtr
2nd Qtr
3rd Qtr
4th Qtr _____ lstQtr
2nd Qtr 3rd Qtr
4th Qtr
5/25/2005 14.6
8/31/2005 10.l
12/7/2005 9.6 3/9/2006 8.5
6/14/2006 10.2
7/20/2006 8.9
11/8/2006 8.7
2/28/2007 8.7
6/27/2007 8.6
8/15/2007 8.6
10/10/2007 8.3
3/28/2008 14.3 6/25/2008 8.8
9/10/2008 7.57
10/15/2008 8.0
3/11/2009 8.3
6/23/2009 8.1
9/14/2009 9.2
12/22/2009 8.4-----------------------------------2/25/2010 8.4
6/14/2010 12.0
8/13/2010 14.0
10/15/2010 7.0 -----------------------------------2/22/2011 9.0
6/28/2011 12.0
8/17/2011 14.0 11/16/2011 13.0
(l)lstQtr _ 1/19/2012 ----------15.0 -----2nd Qtr 6/13/2012 11.0
3rd Qtr 9/13/2012 13.0
4th Qtr 10/4/2012 14.0
lstQtr 2/13/2013 11.8
2nd Qtr 6/18/2013 13.8
3rd Qtr 9/13/2013 10.3
4thQtr 11/13/2013 9.0
lstQtr 2/5/2014 11.4
2nd Qtr 5/22/2014 11.5
3rd Qtr 8/27/2014 7.1
4thQtr 10/29/2014 10.0
lstQtr 3/12/2015 10.9 (2)2nd Qtr 6/8/2015 13.1 -----------------------3rd Qtr 8/31/2015 14.7
�!!:.SJ:!r 10/19/201_� 14.3
lstQtr 3/9/2016 14.6
2nd Qtr 5/23/2016 13.1
3rd Qtr 7/25/2016 16.5
4th Qtr 10/12/2016 13.5
lstQtr 3/8/2017 17.7
2nd Qtr 6/13/2017 9.53
3rd Qtr 7/26/2017 18.20
4th Qtr 10/11/2017 16.90
DWMRC split TW4-21 11.0
lstQtr 3/12/2018 15.8
2nd Qtr 6/8/2018 14.1
3rd Qtr 8/22/2018 0.236
4th Qtr 10/22/2018 15.2
lstQtr 3/8/2019 9.0
2nd Qtr 6/5/2019 17.5
3rd Qtr 9/4/2019 14.7
4th Qtr 12/10/2019 5.73
lstQtr 2/19/2020 8.9
2nd Qtr 5/27/2020 15.4
3rd Qtr 9/4/2020 12.6
4th Qtr 10/28/2020 16.30
lstQtr 2/23/2021 15.2
2nd Qtr 6/9/2021 21.5
3rd Qtr 8/24/2021 12.9
4th Qtr 12/1/2021 17.2
lstQtr 3/9/2022 2.2
2nd Qtr 6/8/2022 8.9
3rd Qtr 8/30/2022 14.3
4th Qtr 11/30/2022 2.1
lstQtr 3/7/2023 10.9
2nd Qtr 6/13/2023 17.3
NA= not analyzed
NA 2nd Qtr 5/25/2005
NA 3rd Qtr 8/31/2005
353 4th Qtr 12/7/2005
347 lstQtr 3/9/2006
318 2nd Qtr 6/14/2006
357 3rd Qtr 7/20/2006 296 4th Qtr 11/8/2006
306 lstQtr 2/28/2007 327 2nd Qtr 6/27/2007
300 3rd Qtr 8/15/2007
288 4th Qtr 10/10/2007
331 lstQtr 3/28/2008
271 2nd Qtr 6/25/2008 244 3rd Qtr 9/10/2008
284 4th Qtr 10/15/2008 279 lstQtr 3/11/2009
291 2nd Qtr 6/23/2009
281 3rd Qtr 9/14/2009
256 4thQtr 12/29/2009 ---------------------228 lstQtr 3/3/2010
266 2nd Qtr 6/14/2010
278 3rd Qtr 8/24/2010
210 4th Qtr 10/15/2010 ---------------------303 lstQtr 2/22/2011 290 2nd Qtr 6/1/2011
287 3rd Qtr 8/17/2011
287 4th Qtr 11/16/2011 228 (i)lst Qtr 1/19/2012 ------------------285 2nd Qtr 6/13/2012
142 3rd Qtr 9/12/2012 270 4th Qtr -��12.°.!.2 ----221 (3)1stQtr 2/11/2013
243 2nd Qtr 6/5/2013
207 3rd Qtr 9/3/2013
206 4th Qtr 10/29/2013
200 lstQtr 1/27/2014 243 2nd Qtr 5/19/2014
230 3rd Qtr 8/11/2014
252 4th Qtr 10/29/2014
255 lstQtr 3/9/2015
494 2nd Qtr 6/8/2015 -------499 3rd Qtr 8/31/2015
413 4thQtr 10/19/2015 --------------452 lstQtr 3/9/2016
425 2nd Qtr 5/23/2016
457 3rd Qtr 7/25/2016
439 4th Qtr 10/12/2016
452 lstQtr 3/8/2017
309 2nd Qtr 6/13/2017
447 3rd Qtr 7/26/2017
378 4thQtr 10/11/2017
310 OWMRC split ofTW4-22
447 lstQtr 3/12/2018
387 2nd Qtr 6/8/2018
182 3rd Qtr 8/22/2018
378 4th Qtr 11/28/2018
180 lstQtr 3/8/2019
456 2nd Qtr 6/5/2019
478 3rd Qtr 9/4/2019
339 4th Qtr 12/10/2019
446 lstQtr 2/19/2020
353 2nd Qtr 5/27/2020
382 3rd Qtr 9/4/2020
411 4th Qtr 10/28/2020
454 lstQtr 2/23/2021
461 2nd Qtr 6/9/2021
375 3rd Qtr 8/24/2021
227 4thQtr 12/1/2021
110 lstQtr 3/9/2022
331 2nd Qtr 6/8/2022
425 3rd Qtr 8/30/2022
158 4th Qtr 11/30/2022
335 lstQtr 3/7/2023
397 2nd Qtr 6/13/2023
(1) As of March 2012 both north and south wild ltfe 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
DWMRC = Utah Division of Waste Management and Radiation Control
Parameter
GWQS
Nitrate, Nitrate + Nitrite Chloride (mg/I)
(10 mg/L) NoGWQS was not sampled
18.2 NA 15.7 NA
15.1 253
15.3 236
14.3 221
14.5 221 15.9 236
20.9 347
19.3 273
19.3 259
18.8 238
39.1 519
41.9 271 38.7 524
36.3 539
20.7 177 20.6 177
40.3 391 17.8 175
36.8 427 19.0 134
15.0 130
16.0 134
18.0 114
17.0 138 15.0 120
19.0 174
14.0 �-----.]� ------------12.8 35
7.0 121 14.0 130 ------------,_ _______58.0 130
50.2 586
29.7 487
45.2 501 54.6 598
47.2 614 41.5 540
54.9 596
69.2 675 47.1 390
64.7 557
56.1 567 -----------------------------31.1 583
58.4 598
61.3 619
61.5 588
69.8 566
70.8 572
66.1 391
80.1 600
79.0 61( 62.3 60
72.5 58(
55.4 613
75.7 567
71.9 528 83.9 662
72.5 588
59.9 608
57.7 606
60.5 578
64.8 514
64.9 523 69.6 6
89.3 4
35.1 4
68.8 5
40.4 442
45.0 564
69.9 637
62.0 601
49.l 562 49.8 596
Table 14 of 16
Historic Nitrate, Nitrate+ Nitrite and Cloride Concentrations in Monitor Wells Up to the 2nd Quarter 2023
Nitrate Contamination Investigation
White Mesa Uranium Mill
TW4-24(Pumpin& well m1rtin1 in Parameter TW4-25 (Pumpin1wellsutin1in Parameter Jilnuuv 2013)
Sampling Event GWQS
Nitrate, Nitrate+ Nitrite Chloride (mg/I) (10 mg/L) NoGWQS 2nd Qtr 6/27/2007 26.1 770
3rd Qtr 8/15/2007 29 791 4th Qtr 10/10/2007 24.7 692
lstQtr 3/28/2008 24.4 740 2ndQtr 6/25/2008 45.3 834
3rd Qtr 9/10/2008 38.4 1,180
4th Qtr 10/15/2008 44.8 1,130
lstQtr 3/4/2009 30.5 1,010
2ndQtr 6/23/2009 30.4 759
3rd Qtr 9/14/2009 30.7 618
4th Qtr 12/16/2009 28.3 1,080 lstQtr 2/25/2010 33.1 896
2ndQtr 6/14/2010 30 639
3rd Qtr 8/24/2010 31 587
4th Qtr 10/15/2010 31 522
lstQtr 2/17/2011 31 1,100
2nd Qtr 5/26/2011 35 1,110
3rd Qtr 8/17/2011 34 967
4th Qtr 11/16/2011 35 608
lstQtr 1/16/2012 37 373 ------------------------------2nd Qtr 6/6/2012 37 355
3rd Qtr 8/30/2012 37 489
4thQtr 10/3/2012 38 405 lstQtr 2/11/2013 35.9 ____ __!.2� -----------------------2nd Qtr 6/5/2013 23.7 916
3rd Qtr 8/30/2013 33 998
4th Qtr 10/29/2013 35 1,030
lstQtr 1/27/2014 31.6 809
2nd Qtr 5/19/2014 35.0 1,020
3rd Qtr 8/11/2014 31.5 1,150 4th Qtr 10/21/2014 35.7 1,050
lstQtr 3/9/2015 34.6 944
2nd Qtr 6/8/2015 31.8 1,290
3rd Qtr 8/31/2015 25.3 788
4th Qtr 10/19/2015 29.6 909
lstQtr 3/9/2016 29.1 989
2nd Qtr 5/23/2016 24.2 771
3rd Qtr 7/25/2016 34.4 1,180
4thQtr 10/12/2016 31.9 1,010
lstQtr 3/8/2017 41.3 1,090
2nd Qtr 6/13/2017 39.9 1,080
3rd Qtr 7/26/2017 40.0 1,230
4th Qtr 10/11/2017 31.7 895
DWMRC split ofTW4·24 32.0 1,100
lstQtr 3/16/2018 44.9 1,320
2nd Qtr 6/14/2018 33.6 792
3rd Qtr 8/22/2018 33.8 996
4th Qtr 11/28/2018 38.4 1,100
lstQtr 3/8/2019 39.3 1,040
2nd Qtr 6/5/2019 33.2 1,020
3rd Qtr 9/4/2019 36.4 1,130
4thQtr 12/10/2019 33.8 1,090
lstQtr 2/19/2020 37.1 1,010
2nd Qtr 5/27/2020 41.7 1060
3rd Qtr 9/4/2020 39.1 1100
4th Qtr 10/28/2020 35.90 1050
lstQtr 2/23/2021 41.9 1,170
2nd Qtr 6/9/2021 48.0 938
3rd Qtr 8/24/2021 26.7 1010
4th Qtr 12/1/2021 43.60 1140
lstQtr 3/9/2022 36.2 890
2nd Qtr 6/8/2022 35.0 944
3rd Qtr 8/30/2022 32.0 868
4th Qtr 11/30/2022 27.6 972
lstQtr 3/7/2023 36.2 932 2nd Qtr 6/13/2023 35.9 866 As of March 2012 both north and south wlld hfe ponds no longer rece1v1ng water Chloroform pumping well started January 2013
Jilnuuy2013)
Sampling Event
2nd Qtr 6/27/2007 3rd Qtr 8/15/2007 4th Qtr 10/10/2007 lstQtr 3/28/2008
2nd Qtr 6/25/2008 3rd Qtr 9/10/2008 4thQtr 10/15/2008 lstQtr 3/4/2009 2nd Qtr 6/23/2009 3rd Qtr 9/14/2009 4thQtr 12/14/2009
lstQtr 2/23/2010 2nd Qtr 6/14/2010
3rd Qtr 8/10/2010 4th Qtr 10/15/2010 lstQtr 2/16/2011 2nd Qtr 5/25/2011
3rd Qtr 8/16/2011 4th Qtr 11/15/2011 lstQtr 1/16/2012 1------si3J./2012 2nd Qtr 3rd Qtr 9/4/2012
4th Qtr 10/3/2012 lstQtr 2/11 2013
(2)2;;-dQtr -60/2013
3rd Qtr 9/4/2013 4thQtr 10/31/2013
lstQtr 1/27/2014 2nd Qtr 5/19/2014 3rd Qtr 8/11/2014
4th Qtr 10/21/2014 lstQtr 3/9/2015 2nd Qtr 6/8/2015 3rd Qtr 8/31/2015
4thQtr 10/19/2015
OWMRC split ofTW4-25 lstQtr 3/9/2016
2nd Qtr 5/23/2016 3rd Qtr 7/25/2016
4th Qtr 10/12/2016 lstQtr 3/8/2017 2nd Qtr 6/13/2017
3rd Qtr 7/26/2017 4th Qtr 10/11/2017
lstQtr 3/12/2018
2nd Qtr 6/14/2018 3rd Qtr 8/22/2018 4th Qtr 11/28/2018
lstQtr 3/8/2019 2nd Qtr 6/5/2019
3rd Qtr 9/4/2019 4th Qtr 12/10/2019
lstQtr 2/19/2020 2nd Qtr 5/27/2020 3rd Qtr 9/4/2020
4th Qtr 10/28/2020 lstQtr 2/23/2021 2nd Qtr 6/9/2021
3rd Qtr 8/24/2021 4th Qtr 12/1/2021
lstQtr 3/9/2022 2nd Qtr 6/8/2022 3rd Qtr 8/30/2022
4th Qtr 11/30/2022 lstQtr 3/7/2023 2nd Qtr 6/13/2023
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
GWQS Nitrate, Nitrate + Nitrite Chloride (mg/I) (10 mg/L) NoGWQS
17.1 395 29 382
17 358 18.7 374 22.1 344 18.8 333 21.3 366
15.3 332 15.3 328
3.3 328 14.2 371 14.4 296
16 306 14 250
15 312 15 315 16 321 16 276 16 294 16 304 ------------'--------16 287 17 334 17 338 9.04 190 ------------,_ _______5.24 136 5.69 119
6.1 88.6 2.16 85.7 1.21 51.1 1.6 67 1.03 58.1
14.4 310 1.14 58.3 1.63 69.2 1.78 93.7 1.50 94
0.837 62.7 0.959 75.5 1.78 74.1 1.24 59.8 17.0 285
0.976 69.8 1.23 70.1
1.29 68.0
2.23 70.5 1.14 60.3 0.810 69.1
0.634 59.70 0.639 65.0 0.821 59.0
0.548 58.1
0.841 73.10
0.607 86.0 0.851 76.8
0.994 67.3 1.6 61.3 3.43 100.0
1.57 55.1 0.793 69.3 0.978 93.7
1.8 70.3
0.88 72.8
1.51 82.5 1.47 67.2 1.96 96.7 1.03 73
Table 15 of 16
Historic Nitrate, Nitrate + Nitrite and Cloride Concentrations in Monitor Wells Up to the 2nd Quarter 2023
Nitrate Contamination Investigation
TW4-37(Pumpin1 well st�rtin1 in
June2015)
Sampling Event
2nd Qtr .l 6/8/2015
:;� �:; _____ --1�j�!j!��! lstQtr 3/9/2016 2ndQtr I 5/23/2016 3rd Qtr 7/25/2016 4thQtr 10/12/2016 lstQtr 3/8/2017 2nd Qtr 6/15/2017 3rd Qtr 7/26/2017 4thQtr 10/11/2017 lstQtr 3/12/2018 2nd Qtr 6/8/2018 3rd Qtr 8/22/2018 4th Qtr 11/28/2018 lstQtr 3/8/2018 2nd Qtr 6/5/2019 3rd Qtr 9/4/2019 4th Qtr 12/10/2019 lstQtr 2/19/2020 2nd Qtr 5/27/2020 3rd Qtr 9/4/2020 4thQtr 10/28/2020 lstQtr 2/23/2021 2nd Qtr 6/9/2021 3rd Qtr 8/24/2021 4thQtr 12/1/2021 lstQtr 3/9/2022 2nd Qtr 6/8/2022 3rd Qtr 8/30/2022 4thQtr 11/30/2022 lstQtr 3/7/2023 2nd Qtr 6/13/2023
White Mesa Uranium Mill
Parameter
GWQS
Nitrate, Nitrate + Nitrite Chloride (mg/I) (10 mg/L) NoGWQS 35.2 345 32.4 374 34.6 399 --------------------------------------------------------28.4 332 27.9 389 33.4 294 26.1 304 32.3 305 31.2 28 30.5 27 30.6 25' 30.0 26: 28.6 275 25.3 387 27.3 264 30.1 209 31.2 250 25.8 228 25.5 220 28.3 236 28.3 321 29.5 273 28.7 254 26.9 242 26.6 176 25.8 220 31.3 410 29.8 414 28.0 27 26.6 24 30.9 57 19.1 !�35.9
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 2nd Quarter 2023
Nitrate Contamination Investigation
MW-30
Sampling Event
2nd Qtr
3rd Qtr 4th Qtr
lstQtr 2nd Qtr
3rd Qtr
4th Qtr lstQtr
2nd Qtr 3rd Qtr
4thQtr lstQtr
2nd Qtr 3rd Qtr
4th Qtr lstQtr
2nd Qtr
3rd Qtr
4th Qtr
lstQtr
2nd Qtr
3rd Qtr 4thQtr
lstQtr 2nd Qtr
3rd Qtr
4thQtr 1st Qtr
2nd Qtr 3rd Qtr
4th Qtr
lstQtr
2nd Qtr
3rd Qtr 4th Qtr
lstQtr 2nd Qtr
3rd Qtr 4th Qtr
lstQtr
2nd Qtr 3rd Qtr
4thQtr lstQtr
2nd Qtr 3rd Qtr
4th Qtr
lstQtr
2nd Qtr
3rd Qtr 4thQtr
lstQtr 2nd Qtr
3rd Qtr
4th Qtr _____ lstQtr
2nd Qtr 3rd Qtr
4th Qtr
lstQtr
2nd Qtr
3rd Qtr 4th Qtr
lstQtr
2nd Qtr
3rd Qtr
4th Qtr lstQtr
2nd Qtr 3rd Qtr
4thQtr
lstQtr 2nd Qtr
6/22/2005
9/22/2005 12/14/2005
3/22/2006 6/21/2006
9/13/2006
10/25/2006 3/15/2007
2007 8/22/2007
10/24/2007 3/19/2008
6/3/2008 8/4/2008
11/5/2008
2/3/2009
5/13/2009
8/24/2009 10/14/2009
2/9/2010 4/27/2010
9/14/2010 12/14/2010
2/1/2011
6/20/2011 9/7/2011
12/12/2011 3/14/2012
6/18/2012
9/19/2012
12/26/2012
2/26/2013 5/15/2013
7/10/2013
11/20/2013
2/25/2014
6/3/2014
9/9/2014
11/10/2014 2/4/2015
4/8/2015 8/11/2015
11/11/2015
2/10/2016
5/4/2016
8/18/2016 11/3/2016
2/2/2017 4/5/2017
8/14/2017
11/1/2017
2/22/2018
4/12/2018 9/11/2018
10/22/2018 2/13/2019
4/10/2019
7/16/2019 10/8/2019
1/15/2020
4/6/2020
7/6/2020
12/8/2020
3/8/2021
4/14/2021 7/29/2021
10/19/2021 1/17/2022
4/20/2022
7/12/2022 10/13/2022
1/25/2023 4/26/2023
Parameter
GWQS
Nitrate, Nitrate+ Nitrite
(10 mg/L)
12.4
12.8
13.6
13.8
14.5 14.1
14.6
14.4
not sampled
14.6
14.9
14.8
18.7
17.3 15.6
15.3 15.1
20.9
15.0
16.1
15.8
15.0
16.0 16.0
16.0
17.0
16.0
18.0 15
16
17.2
21.4
18.8 17.6
19.5 18.4
19.5
16.8
16.2
14.9 17
17.9 16.3
20 17.3
18
18 17.4
18.3 19.2
17.4
17.6
17.3
18 17.2
18.2 18.5
19.3
18.2 16.4
18.1 18.4
12
17 17.7
20.6 14.3
14.5
17.0
17.6
17.9 18.1 15.9
White Mesa Uranium Mill
MW-31
Sampling Event
Chloride (mg/I)
NoGWQS
125 2nd Qtr 6/22/2005
125 3rd Qtr 9/22/2005
128 4th Qtr 12/14/2005
125 lstQtr 3/22/2006
124 2nd Qtr 6/21/2006
118 3rd Qtr 9/13/2006
124 4th Qtr 10/25/2006
125 lstQtr 3/15/2007 2nd Qtr 2007
126 3rd Qtr 8/22/2007 122 4thQtr 10/24/2007
118 lstQtr 3/19/2008 125 2nd Qtr 6/3/2008
121 3rd Qtr 8/4/2008 162 4th Qtr 11/5/2008
113 lstQtr 2/3/2009
122 2nd Qtr 5/13/2009
118 3rd Qtr 8/24/2009
129 4th Qtr 10/14/2009
127 lstQtr 2/9/2010
97 2nd Qtr 5/21/2010
111 3rd Qtr 9/13/2010
126 4thQtr 11/9/2010
134 lstQtr 2/1/2011
124 2nd Qtr 6/20/2011
127 3rd Qtr 9/7/2011 124 4th Qtr 12/12/2011
128 lstQtr 3/13/2012
131 2nd Qtr 6/18/2012
130 3rd Qtr 9/18/2012
122 4th Qtr 12/18/2012
129 lstQtr 2/19/2013
119 2nd Qtr 5/13/2013
130 3rd Qtr 7/9/2013
124 4th Qtr 11/18/2013
135 lstQtr 2/17/2014
128 2nd Qtr 6/3/2014
139 3rd Qtr 9/3/2014
154 4th Qtr 11/4/2014
136 lstQtr 2/2/2015
142 2nd Qtr 4/7/2015
165 3rd Qtr 8/10/2015
140 4th Qtr 11/9/2015
145 1st Qtr 2/10/2016
139 2nd Qtr 5/3/2016 150 3rd Qtr 8/16/2016
143 4th Qtr 11/1/2016
150 lstQtr 2/7/2017
146 2nd Qtr 5/1/2017
173 3rd Qtr 8/14/2017
156 4th Qtr 11/1/2017
158 lstQtr 2/20/2018
145 2nd Qtr 4/17/2018
183 3rd Qtr 9/10/2018
140 4th Qtr 10/24/2018
167 lstQtr 2/12/2019
138 2nd Qtr 4/10/2019 181 3rd Qtr 7/16/2019
170 4thQtr 10/9/2019
182 lstQtr 1/15/2020
195 2nd Qtr 4/6/2020
185 3rd Qtr 7/7/2020
166 4th Qtr 12/7/2020
192 lstQtr 3/9/2021
162 2nd Qtr 4/13/2021
188 3rd Qtr 7/27/2021
182 4thQtr 10/19/2021 181 lstQtr 1/19/2022
173 2nd Qtr 4/11/2022
108 3rd Qtr 7/12/2022
195 4th Qtr 10/11/2022
166 lstQtr 1/24/2023
202 2nd Qtr 4/24/2023
Shaded= Nitrate, Nitrate+ Nitrite concentrations greater than the Ground Water Quality Standard of 10 mg/I
Parameter
GWQS
Nitrate, Nitrate + Nitrite (10 mg/L)
24.2 22.4
23.8
24.1
25.3
24.6 25.1
23.2
not sampled
23.3
24.6
25
29.3
28.7
29.9 23.4
22.4 15.4
22.6
21.7
23
21 20
21 22
21
21 22
21.6 21
22.2
19.3 23.8
21.7
23.9
20.6
23.1
18.9
20.9 18.7
19 19.9
18.4
18.8 18.6
19.7 19.8
21.1
18.3 19.5
19 18.8
19
20.l
18.3 ------------------------------------18.6 19.7
19.8
19.8 17.5
18.8 19.2
18.8
17.4 18.6
18.7 18.1
18.0
18.0
16.9
17 18.7 14.3
Chloride (mg/I) NoGWQS
139 136
135
133
138
131 127
132
136
122
124
128
124
119 115
124 122
138
128
128
139 138
145
145 148
148 152
138
172
170
174 169
182
174 197
173 210
204 211
211
264 215
246 243
272
267 266
263 310
292
292
308
333 286
296 294
374
318 381
376
370 311
388 377
391
371 370
372 421
397
333 297
Table 2
Summary of QA/QC Duplicate Sample
2nd Quarter 2023
Parameter GWQS Duplicate of TWN-4
TWN-4 TWN-65
Nitrate + Nitrite (as N) 10 mg/L 1.21
Chloride none 15.9
High lighted exceeding PRD (Rel1tve % difference) of 20%
NA= Not Analyzed
1.13
18.8
RPO
6.8
-16.7
Data Discriptions
t-JitrlllE1(1T19il)
t-J�rll!El(!,lil,) Nitrate (lbs/L)
t-J�rllle (lb11/9c1I) ..... }:e>tal9lllle>.1111.pu1T1.f>E1d lbs of nitrate removed Gallons of nitrate removed •••••••••
MW4 MW-26
Total lbs nitrate removed from all pumping wells
TW4-1
Total lbs nitrate removed from nitrate pumping wells
TW4-2
Tabel 3
DWMRC Nitrate Mass Removal Calculations Energy Fuels Resorses Inc. White Mesa Mill, Bland, Utah
2nd Quarter 2023
Chloroform Pumping Wells
TW4-4 TW4-11 TW4-19 TW4-21 TW4-37 TW4-39
67
28
Nitrate Pum0in11 Wells
TW4-4O TW4-41 TWN-2 TW4-22 TW4-24 TW4-25
,