DRC-2022-023754 - 0901a068811347d1

State of Utah
SPENCER J. COX
Governor
DEIDRE HENDERSON
Lieutenant Governor
Department of
Environmental Quality
Kimberly D. Shelley
Executive Director
DIVISION OF WASTE MANAGEMENT
AND RADIATION CONTROL
Douglas J. Hansen
Director
MEMORANDUM
TO: Phil Goble PR.C l<'fr/22..
FROM: Dean Henderson 0/fJ / '2 /,; / 72--
DATE: December 5, 2022
SUBJECT: Review of the August 15, 2022 2nd Quarter 2022 Nitrate Monitoring Report (DRC-2022-
020175) 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 15, 2022, 2nd Quarter, 2022 White Mesa Uranium Mill Nitrate Monitoring Report ("Report")
for the Nitrate Contamination Investigation.
For the review of this Report the following regulatory enforcement documents were used:
• Energy Fuels Resources (USA) Inc., White Mesa Uranium Mill, Groundwater Discharge Permit
No. UGW370004, signed March 19, 2019 ("Permit").
• Corrective Action Plan for Nitrate White Mesa Uranium Mill near Blanding, Utah, May 7, 2012,
("CAP") approved December 12, 2012.
• The EFR Quality Assurance Plan ("QAP") August 22, 2019 (Revision. 7.6)
REVIEW
The CAP requires the 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 August 19, 2022 (date of Report August 15, 2022) which meets the CAP requirement.
Monitor Wells Sampled and Parameters Analyzed
The following monitor wells were sampled and analyzed for inorganic chloride and nitrate+ nitrite (as
N), and field data work sheets were filled out for each well as required in the CAP:
DRC-20 195 North 1950 West• Salt Lake City, UT
Mailing Address: P.O. Box 144880 • Salt Lake City, UT 84114-4880
Telephone (801 ) 536-0200 • Fax [phone] • T.D.D. [phone]
ltnvw.deq.utah.gov
Printed on 100% recycled paper
DRC-2022-023754
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, 2022 depth to groundwater was measured in the following wells and/or piezometers
as required in Part I.E.3 of the Permit:
• The quarterly groundwater compliance monitoring wells. .
• Existing monitoring well MW-4 and all of the temporary chloroform investigation
wells.
• Piezometers P-1, P-2, P-3A, P-4 and P-5.
• MW-20, MW-22 and MW-34
• Nitrate monitoring wells.
• The DR piezometers which were installed during the Southwest Hydrologic
Investigation.
In addition to the above, depth to water measurements are routinely observed in conjunction with
sampling events for all wells sampled during quarterly and accelerated efforts, regardless of the
sampling purpose. All well levels used for groundwater contour mapping were measured and recorded
within 5 calendar days of each other.
The monitoring wells were purged using the three approved QAP well purging strategies and meet QAP
requirements for each strategy:
1. Purging two casing volumes with stable field parameters for specific conductivity,
turbidity, pH, redox potential, and water temperature (within 10% RPD):
Wells: TWN-1, TWN-4, and TWN-18.
2. Purging a well to dryness and stability of field parameters for pH, specific conductivity, and
water temperature only after recovery:
Wells: TWN-3, TWN-7, TWN-20, and TWN-21
3. Continuously Pumped Wells that are considered sufficiently evacuated to immediately
collect a sample:
Wells: TWN-2, TW4-22, TW4-24, and TW4-25.
Detection Limits
All sample sets were measured and reported to the required QAP reporting limits.
Page 3
Sample Duplicates
One duplicate sample was collected at TWN-18 and identified as TWN-65. The duplicate sample
analytical results for this sample/duplicate pair QA/QC were within the 20% acceptance limits as
required in the QAP except for nitrate (see Table 2 below).
Holding Times
The method holding times for each parameter for samples collected at each monitor well were received
and analyzed within the required holding times in the QAP.
Receipt Temperature
All samples were received within the required QAP temperature limit of 6° C.
Analytical Methods
Chloride and nitrate+ nitrite (as N) were analyzed for methods consistent with the requirements of the
QAP.
Estimation of Pumped Nitrate Mass Removal
An estimated 52 lbs. of nitrate were removed from the chloroform pumping wells (MW-4, MW-26,
TW4-1, TW4-2, TW4-4, TW4-11, TW4-19, TW4-37, TW4-39 and TW4-41) and the nitrate pumping
wells (TWN-2, TW4-22, TW4-24, and TW4-25). Of the 52 lbs. removed, approximately 26 lbs. was
removed by the nitrate pumping wells. In the attached Table 3, the Division shows calculations that
verify these reported estimates.
Reporting
The Report included the following information as required in the CAP:
a) Introduction
b) Sampling and Monitoring Plan:
i. Description of monitor wells sampled;
ii. Description of sampling methodology, equipment and decontamination
procedures;
iii. Identification of all quality assurance samples, e.g. equipment blanks
duplicate samples, etc.
c) Data Interpretation:
1. Interpretation of groundwater levels, gradients, and flow directions. The interpretation will
include a discussion on: 1) current site groundwater contour map, 2) hydro graphs to show
groundwater elevation in each monitor well over time, 3) depth to groundwater measured and
groundwater elevation from each monitor well summarized in data table that includes historic
groundwater level data for each well, 4) calculations documenting quarterly nitrate mass
removed by pumping;
11. Interpretation of all analytical results for each well including a discussion on: 1) a current
nitrate isoconcentration map, 2) graphs showing nitrate concentration trends in each well
through time and, analytical results for each well summarized in data table that includes
historic analytical results for each well; and
Page4
iii. An electronic copy of all laboratory results for groundwater quality monitoring conducted
during the quarter will be provided to the Executive Secretary.
d) Conclusions and Recommendations
e) Copies of EFR field reports, laboratory reports, and chain· of custody forms.
Evaluation of the Nitrate Contaminate Plume and Its Associated Contaminants
The groundwater monitoring data appeared to show that the nitrate contaminate plume ("Plume") is
bound by up gradient, cross gradient, and down gradient wells that have nitrate concentrations below the
Utah 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, 2022 Nitrate Monitoring Report for the Nitrate
Contamination Investigation, Energy Fuels Resources (USA) Inc. complies with the CAP and QAP.
Therefore, a letter will be drafted notifying EFR of the review and closing out of this Report.
Page 5
References
Energy Fuels Resources (USA) Inc., White Mesa Uranium Mill, Groundwater Discharge Permit No.
UGW370004, signed March 19, 2019.
Energy Fuels Resources (USA) Inc., June 5, 2019, White Mesa Uranium Mill, Ground Water
Monitoring Quality Assurance Plan (Revision 7 .5).
Energy Fuels Resources (USA) Inc., White Mesa Uranium Mill 2nd Quarter, 2022 Nitrate Monitoring
Report, August 15, 2022.
HYDRO GEO CHEM, INC, May 7, 2012, Corrective Action Plan for Nitrate White Mesa Uranium Mill
near Blanding, Utah.
Table 1 of16
Historic Nitrate, Nitrate+ Nitrite and Cloride Concentrations in Monitor Wells Up to the 2nd Quarter 2022
Nitrate Contamination Investigation
TWN-1
Sampling Event
Parameter
GWQS
White Mesa Uranium Mill
TWN-2 (Pumf){nc well startin1 In
January 2013)
Sampling Event
Nitrate, Nitrate+ Nitrite
10m L
ls.! gt,_ ... 3/1.7/?010
?nd_Qtr . .. 5/~6(?010
?rd. (ltr_ .. 9/27/2010
4th Qtr .. .. 12/7/2010
i.st (l!r 1/26/2011
?ndQtr_ ·· ·· ··· 4/20/2011 · ··· ··
3rd Qtr •• .. ••• 7/2.6/2.0l.1 · ·
4th Qtr 10/17/2011
1st Qtr 1/9/2012
2riciO:tr· ·· · ·· · i.iis/2012
.. p 1st Cl!•. 3/24/2010
o.6 ........................ 2g 2~d Cltr. .••••......... 6/2/2010
0.6 ...................... ~~ 3rd(ltr ... • •• 9./29./].9i(J
0.6 14 4th Qtr 12/9/2010
0.5 .. ... . .. 1? 1st (ltr_ 2/1/2011
o.5 .. 19 2~d qt~... • •• 4/2.ii/2011
0.5 .. 1~ 3rd __ qtr. 7/28/2011
0.5 10 4th Qtr ... ... . 1ohohoii
0.6 15 1st Qtr 1/12/2012 ·· · ·· ·· ·· ·· ·· ·· o.6 · ·· ·· ··· ·· ·· ·· ··· ·· ii 2nd titr ·· ··· 4/20/ioii
3;:;i Qt;:· --iii°4/2012 4!!! _gt.!:__ .. 10/17/2012
1st ot, .. -: ihsli,013
·•• ··· ··· ·· ·· ··· ··· ··· ··· ··· ··· ··· ··· o~d~L ··· ·· ··· · ·•• ··· d~ ~i~~; ··· ··· 1~~~~
........... o,Gll ................ 11.~ 1st Cl!•. "i7i~io:i3
?n_d<ltr_ .. 4/23/2013
?'.d. .Cl!•.. . : si2.ii2.013
4th Qtr . 10/16/2013
TWN•6S duplicat ofTWN-1
DRC split of TWN-1
DRCduplicate ofTWN-1
1st Qtr 1/14/2014
2nc1 O:tr· ·· ·· ··· ·•· sJi,12014
3rd oir ··· ··· ··· sJ51201i.
TWN-65 duplicate ofTWN-.1
4th oir ... .. ·•• . 10/s/2014
1st Qtr 2/18/2015
N-65 ~~p ofTWN--1
2nd Qtr . ... 5/!3/~015
3rd Qtr 8/25/2015
4th oir .. ioti3/201s
:J,s! ().tr . 2/23/2016
2nd Qtr 5i17/20l.6
3rd Qtr 7/20/2016
4th Qtr 10/6/2016
1st Qtr 2/15/2017
TWN-65 duplicate of TWN-1
2ricJO:tr ··· 1 ··· ·· Gh.12011 . ···
TWN-65 duplicate of TWN-1
3rd cir •·· r 1iiCJ/2011 ...
N-65 duplicate of TWN-1
4th oir ... T ·· 10Ji.12011
N-65 duplicate ofTWN-1
1.S! 9tr .. .. .. .. 1/1.8(?018
?nd Qtr ... .. .. 5/8/~0l.P,
?'d. qtr .. 8/8/2018
4th Qtr i1i20/20l.8
ls! 9tr 2/20/2019
0.84 17.4 2nd Qtr 4/24/2013
1.24 ?4-1. 3rdqtr. .... j/2?/'J.oj3
1.61 26.8 4th Qtr 7/16/2013
1.48
1.6
0.22
27.1 ORCsplitofTWN-2
30
30
1.47 .... 29_.? lst .. Clt• ..
1.63 ................... 3.~-1. 2~d Cltr.
1.7
1.4
1.46
28 3rd Qtr
28 ••·••······ .... ······-27.6 4th Qtr
1.37 27.8 1st Qtr
1.41 29.0 ···················-··
0.65 .................... 29.2 2~d Cltr .. 5/12/2015
.. 33.? 3rd Qtr .. iih5ho15 0.624
1.35
1.51
1.73
1.76
1.98
2.06
1.98
2 7. 7 4th Qtr .. ... .. l.0/14hois
...... 3.0} 1st (ltr_ . 2/23/2016
32.1 2nd Qtr ·· S/l.7/2016
29.6 3rd Qtr 7/20/2016
33 4th Qtr 10/11/2016
31.2 1st (ltr . . .... ?/15/20p
31.5 ...................................................... ···-·····
1.89 .. ·•• 32-! ?n.d Cltr.
1.88 31.5
2.07
1.89
1.95
1.99
31.2 3r~qtr.
31.4
30.8 ~thqtr.
32.0
1.86 ..................... 30.~ 1st qtr .. 1/.1~/2g;8
1.89 28.4 2nd Qtr ..... ?l9/2g;8
1.97 ..........••.•••••••• 34.-? 3;(!tj_ti 8/8/2018
1.98 28.9 4th Qtr ... ... .. iihohoi8
2.1 ......... 31.4 .1st.Cl\•. ... 212012019
?ndQtr .. 5/29/2019
?rd (l!r.. •• S/i4/2.0l.9
1.93 ......... ~2 .. ~ 211d_ citr. · ·· sh9hoi9
....................... 2,15 . . ...... 39-? 3rdQtr • ~/l.4(20j9
4th Qtr 10/16/2019 2.35 32.0 4th Qtr 10/16/2019
OWMRC split of TWN-1
1st Qtr 1/29/2020
2.n.d:cit~ : 5i2012020
?'~ (l!r. .. . 7/i5/2.0'J.o .
4th Qtr 11/12/2020
1.S! ().tr.. 2/17/2021
2.nd_Qtr ..... 5i25/2021
3.rd (l!r .. S/iS/2021 .
4th Qtr 11/23/2021
1st Qtr 2/15/2022
2nifot, ·· ·· ··· s12i./2022 ·
DRC = Utah Division or Radiation Control.
2.1
2.24
2.36
1.89
2.53
3.18
2.47
DWMR"c = Utah Division of Waste Management and Radiatlon Control
Nitrate Pumping Syitem Stc1rted in January 2013
31.0 OWMRC split ofTWN-2
33.8 1st Qtr 1/29/2 ·· ··· 33.o 2nci iitr ·· ·· · shoh
......•• ~0.-~ 3;~cit~ ••••••• : ?/1$/i
29.2 4th Qtr 11/12/2
................ ~-~ .lst.(ltr.. 2/18/2
....... 34.! 2n.d. qtr, •••••.•.•• $/i$/ ...
3?· ! 3rd Qtr ..
37.4 4th Qtr
35.6 1st Qtr ........ ii.i 2nd citr
As o• March 2012 both north and south wild iife ponds no longer receiving water.
Parameter
Chloride (mg/I}
NoGWQS
85
97
70.4
75
72.4
84.9
80
81
83.6
87.8
74.9
73.9
74.5
68.8
69.8
65.8
61.5
64.2
60.5
61.5
56
50.7
102
50.7
53
52
66.1
59.6
55.6 ..............................
53.5
61.8
61.5
58.9
62.3
59.5 ····· ······ w•i
Table 2 of 16
Historic Nitrate, Nitrate + Nitrite and Cloride Concentrations in Monitor Wells Up to the 2nd Quarter 2022
Nitrate Contamination Investigation
TWN-3
Sampling Event
l~tQtr .. 3/25/2010
21l~ qtr .. . .....•• ~/3(i9io
3r.d Qtr. 7/16/2010
4th Qtr .. ... . 12/i.oho10
l~t Qtr. .. 2/1/2011
2nd Qtr .. 4)2s/29ii
3r.d_ Qtr. 7/29/2011
4th Qtr . 10/20/2011
1st Qtr 1/12/2012
2~ Eii _ · :_4.1.i§f!.ol.i
3r.dqtr.
4tticitr
15.tQtr
2nd Qtr
3r.dqtr ...
4th Qtr
1st Qtr
2nd Qtr
3rd Utr.
4th Qtr
15.t.Utr. ..... 2nd Qtr
3rdQtr ....
4th Qtr
1st Qtr .....
2nd Qtr
3rd Qtr
4th Qtr
2(2~/20!6
5/18/2016
7/20/2016
10/7/2016
Parameter
White Mesa Uranium Mill
Chloride (mg/I)
NoGWQS
TWN-4
Sampling Event
..... ;11 1st. Cl.tr.... . 3/16/2010
..................... !18 2nd (l\r . ... .. SJ~ii~oi9
........................ !06 3rd, (ltr 9/27/2010 117 4th Qtr . ... ... .. 12/8/2010
......... !38 1st. Cl.tr.... 1/25/2011
....................... !28 2n~ Qtr .. ·· ·· 4/20/2011
.. !34 3rd (ltr ·· 7/26/20li
129 4th Qtr ....... ·· 10/18/2011
143 1st Qtr 1/9/2012
· ----~2 ~i~;:__ ·· ~L!~~!3
TWN-65 duplicate of TWN--4
.... !58 3~d cit~ ..... I i12si2oi2
TWN-65 duplicate of TWN-4 .. : ••••••••• : •••••• !.!~ ~:~ ~t; ... f ;~!!~~~~!
TWN-65 duplicate of TWN--4
.. ... ••• ~ii !~: ~i: •• ••• r t~;~~rii!
TWN-65 duplicate of TWN-4
163 4th Qtr I 7/16/2013
TWN-65 duplicate of TWN-4
160 1st Qtr 1/14/2014
TWN-65 dupltcate of TWN-4
168 2~c1 a.ir ..... lsiGhoi4--
~-~~-d-~~!.i~t! ~~ ~-~---
17 4 3rd Q~ 8/5/2014
153 4th Qtr 10/8i2014
. . ... !64. 1st. Cl.tr. 2/18/2015
14l 2nd Qtr .. siiii2ois ..
156 3rd Qtr 8/25/2015
TWN-65 duplicate of TWN-4
129 4tti ot~ .... ·· r1o)i3)io1s
TWN-65 duplicate ofTWN-4
...... !28 1.5t Cl.tr .......... 2/2.3/201~
116 2nd Qtr 5/17/2016
110 3rd Qtr 7/20/2016
113 4th Qtr 10/6/2016
Parameter
GWQS
Nitrate, Nitrate + Nitrite
(10m L
0.9
1.0
0.9
0.9
Chloride (mg/I)
NoGWQS
22
22
19
21
21
21
35
20
20
24
1.1 24 ..... ········-·-·-·-···. ············ ············-··· 1.4 25
1.5 26 ........... ·········-··· ............... . 1.45 26.4
1.5
1.5
1.63
1.6
1.57
1.69
0.22
-------25.3
25.9 ........................ _ ...
24.4
27.2
29.0 ··········· ············-··· 29.4
32
1.41 28.4
1.33 26.4 ••·•• --.......................... ··················-..
1.55
1.54
2.0
1.44
1.48
0.733
0.974
29.6
26.6
28
30.7
31.5
31.9
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
15.tqtr .. 2./16/20p ..... _ !13 1.5t Cl.tr... .. 2/15/2.01? ... 2.63 31.2
21_1~ qtr .. .. ~/2/201.7
3rd_Qtr 7/20/2017
4th Qtr 10/4/2017
15.t Qtr . .. . .. l,/19(2018
21_1~ (ltr 5/9.(29!8
3rd Cltr. .. . .. ~/9./291.8.
l~tQtr
2n~ qtr
3r.dQtr ..
4thCltr. ...
~~~.!~~.it __ ~!-~~! ·-...
1st Qtr ............. ..1/30/2020
2nd Qtr 5/21/2020
3rdQtr f""
4th Qtr 11/13/2020
1st Qtr .......... 2/1.~/2.~2.1.
21_1~ 9tr .. 'H2? 1202.1
3rd.Qtr .......... 8/19/2021
4th Qtr 11/24/2021
1.S! Cltr _ 2/16/2022
2nd Qtr ·· ·· ··· 5/25/2022
.. ... ... _ 1.08 2.n~ qtr 6/1/2017
..... _ 1.06 3.rd, (l\r . •• i iicii2.oi7.
111 4th Qtr 10/4/2017
........ !07 1st Cl.tr. ............. 1/!8/2.01~ .
..................... 1.15. 2nd (ltr. 5/9/2018
...... !49 3rd Qtr ··· ··· ·· ··· 8/8/2018
TWN-65 duplicate ofTWN-4
......... 12.3. 4th oi~ ··· ··· r 11i201201s
TWN-65 duplicate of TWN-4
............. !40 1.5t Cl.tr. .......... 2/2.0/2.019
!37. 2n~ Q!r. 5/29/2019
... 133 3rd, (ltr ··• ·•• •• 8/i4/~01~ . .... 1.26 4th Qtr 10/16/2019
.... ;~9_ TWN-65 duplicate ofTWN-4
DWMRC split of TWN-4
TW4-40 DWMRC duplicate of TWN
4
l?~ 1.~tQ!r. .......... Y2.9.!.2.92.9
136 2nd Qtr 5/20/2020
.... 1~?. l~Qt( .......... 2./1,!(2.Q?; ... _
156 2nd Qtr ....... 5/25/2.021
... . ...... 1~~ 3r.~.9tr ... . . .... ~!.1-8/2_02.1.
147 4th Qtr 11/23/2021
.. 1~~ ~st (ltr .
157 2nd Qtr
:sh1tded • Nltra~,.!j}l!!~,±,!L · !!,<!!!<;l~j.rL9#~Ji1Y,~c=e::::"ca""-"nl""'o::.f l="=---
Nitrate Purnping System St.arted in January 2013
As of March 20·12 both north and south wild life ponds no longer receiving water
2.4 28.6
2.35 28.0
27.4
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
1.89 .... ,_,. .. ,. ......
1.75
1.71
1.75
1.73
1.18
1.64 ........ ,. .... ,. ................... .
1.70
1.28
1.18
1.02
26.0
27.2
25.1
25.4
23.1
23.1
22.8
24.2
23.2
23.7
23.2
23.2
1.5 22.7 . ................................... _, ___ _
1.20 20.9
Table 3 of 16
Historic Nitrate, Nitrate + Nitrite and Cloride Concentrations in Monitor Wells Up to the 2nd Quarter 2022
Nitrate Contamination Investigation
White Mesa Uranium Mill
TWN-5
Sampling Event
Parameter
GWQS
TWN-6
Sampling Event
Parameter
GWQS
Nitrate, Nitrate + Nitrite
(10 mg/L)
Chloride (mg/I)
NoGWQS
lst_Qtr 3/16/2010 ____ 4.3_ 1st Qtr
2nd Qtr •••••• ~J.iGJ.igio .. 4.4 2nd Qtr
3rd_ Qtr 7/12/2010 03 ____________________ 43 3rd Qtr
4th Qtr .. .. ii.17 hoio ---0.3 45 4th Qtr
15.t Qtr_ _ 1/25/2011 0.4 47 1st Qtr
2nd Qtr ·· ··· ··· 4/20/2011 0.3 ________ 4.4 2nd Qtr
3rd Qtt .... 7 )iG)ioii .. .. 03' .. . . 44 3rd Qtr
Nitrate, Nitrate + Nitrite
(10 mg/L)
Chloride (mg/I)
NoGWQS
3/23/2010 1.5 19
6/1/2010 1.4 22
7/13/2010 1.4 73
12/7 /2010,__ ________ 1._2,__ ____ 2 .... 1
1/26/2011 _ .. 1.1 18
4/20/2011 .. .. . ... .. ... . . ...... }:~ 22
7/27/2011 1.1 17
t-4_th~Qt~r ___ 10~/....,17~/,....2_01_1+-________ o_.3+------4--f5 4th Qtr
lstQtr. 1/9/2012 0.2 ________ ...... __ 45_ 1st Qtr
10/18/2011 ________ 1._4 _____ 21--t
1/10/2012 .................. ·•• ·•• ..... ~-? _ 20
2nd Qtr __ .. __ 4/.'18/.29i2 0.3 39 2nd Qtr 4/18/"/.012 1.1 22
3r.d __ (ltr 7/24/2012 0.3 ____ 48 3rd Qtr 7/25/2012 1.4 22
4th Qtr .... 10/lshoi2 ~o:i .. 43.5 4th Qtr 7/15/2012 0. 78 20.4
15.t _ _Qtr ____________ 2013 NA 1st Qtr 2013
t-2_n_d_Q'-tr _____ 2_01_3_.N_A _____________ --f2nd _Qtr2013
TWN-5 abandoned on July 31, 2013 3!d. (ltr _20.13
4th Qtr 2013
NA= Per the CAP and SCO, not sampled
1st Qtr 2.014
2nd Qtr2014
3rd Qtr 2Q14
4th Qtr 2014
1st Qtr 2.0_15
2nd Qtr2015
3rd Qtr 2015
4th Qtr 2015
lstQtr 2016
2_n~ _cl!r_2Q!6_
3rd. (l~2Q16
4th Qtr 2016
1st Qtr _2.0_1?
2n~ Q!r 29! 7 ....
3rd. (ltr 2017
4th Qtr 2017
1st_ qt~ 2.0_1~ -••
2nd Qtr 2018
3rd. (ltr2018
4th Qtr 2018
1st Qtr .2.019
2ndQtr20;9
3rd (ltr 20.19 _
4th Qtr 2019
1st Qtr 2020
2nd qtr202.o __
3rd. (ltr 20.20
4th Qtr 2020
1st cttr 2.0_21 __
2nd Qtr 2021_
3rd. (l~ 20.21 _
4th Qtr 2020
1st Qtr 2022 2i,<1 b.tr 2022 -
NA
NA
NA
NA
NA
NA .....
NA
NA
NA
NA
NA
NA
NA
NA
NA
NA
NA
NA
NA
NA
NA
NA
NA
NA
..
Table4 ofl6
Historic Nitrate, Nitrate + Nitrite and Cloride Concentrations in Monitor Wells Up to the 2nd Quarter 2022
Nitrate Contamination Investigation
TWN-7
Sampling Event
Parameter
GWQS
Nitrate, Nitrate+ Nitrite
10m L)
White Mesa Uranium Mill
Chloride (mg/I)
NoGWQS
TWN-8
Sampling Event
15.tqtr . 3/17/2010 0.8 ..................... 6. 1st CJ.tr. . 3/16/2010 <0.1
211d. qtr ... shsh.010 . 1.2 .............. ____ 6 2n~ Qtr_ .. ••• •• s/?&/?ofrJ <9,j
3rdCltr, . ... 7.j1~/29io --------1.8 -_7 3.r~ Cltr.. 7/12/2010 <0.1
4th Qtr 12/10/2010 l 4 4th Qtr ........ iiji;i.oio <Oi
lstqtr .......... ~(27 /291.l .. . .6. 1st CJ.tr. 1/25/2011 <0.1
211d. ().tr 4/21/2011 1. 7 6 2n~ q1r .. ... •• 4/1.!li?Oll <o:j ..
3rd .. Cltr · ·•• 7./29./201.i ................. OJ .............. 5 3r~ Cltr... .. 7/26/2011 <0.1
4th Qtr 10/19/2011 2.2 6 4th Qtr .. ioi1i;2oii <O.i
1st Qtr 1/11/2012 2.3 5 1st Qtr 1/9/2012 <0.1 2nd far 4i2o/2oi2 -1.2 6 2i,c1 i:itr ... ·•• .. ,iiis/2012 <O:i !~~:I: · ~ii1~1i1; ··· -··· ··· ··· ··· ··· ··· ··· ··· ··· ··· ······/JI -_ ··· ··· s:6~ !;~ g:; ··· ·· iri~Itm; :Kt ·· ________ _
Chloride (mg/I)
NoGWQS
11
11
11
9
13
10
11
15
11
11.l
15.tqtr. -iji9;2013 0.59 ....... 5.,68. ls!.9t'. 2013 NA
2nd qtr · ··· · ··· 4)i_4)i.013 ·· 1.16 ................... 5,88i.=2;;.;n.;;.d-=Qt"'r _ _._ __ .::;2.c.o.1::::3"-"'NA-'-·--------------1
3r,d_ Cltr . ... . •· s)i.s)i.013 ... 0.835 6.96 TWN-8 abandoned on July 31, 2013
4th Qtr .. .. . 10/16)i.Ol3 . 5.7
lstQtr .. 1/15/2014
211d. ().tr ·· ··· 5/7/2014
3rd Cltr ... ·· • ·•• ••• ~l~/291.4 ..
5.75
0.564 5.26
6
4th Qtr 10/9/2014 5.93
lstQtr .. ?(1~/291.5 . 5.58
2nd. ().tr 5/14/2015
3rdQtr 8/6/2015
0.779 6.18
0.348 6.12
4th Qtr 10/14/201S 0.672 5.84
15.tQtr .. 2/24/2016
2nd Qtr ... s/is)i.016
0.24 6.06
0.732 6.26
3rd Qtr 7/21/2016 0.81 5.97
0.698 4th Qtr 10(.?.f~2_01_6_,_ ________ _ 6.17
1.63 14.0
3.74 29.7
29.0
lstQtr . 2/16/2017
2.11d. ().tr ··· ··· 6/2/2017 ·
3rd Cltr ... . ... 7 hoho1i
4th Qtr ... 10/5/2017
lstQtr . . .. ~(19/291.8
2.11d. ().tr 5/9/2018
3r,d Cltr. ... . · ·· ··· a19ho1a
4th Qtr 1ihiho1s
15.tqtr ?/2~/2019
2nd. qt! .. 5/30/2019
3r,d Cltr ......... s/1~/2019 120
4th Qtr 10/17/2019 119
DWMRC split ofTWN-7
15.t.Utr.. ... . .. ~/30/29?0.
2nd Qtr 5/21/2020
iid qti ••• ••• . ••• ? /16/20?0 4th Qtr 11/13/2020
15.1 Qtr ... ... . ... 2/18/20?1
211d. ().tr ... ~/27 /20? .
3r,d Cltr, ... . .. ?/_1~/29? ..
4th Qtr 11/24/2020
1st Qtr 2/17/2022 2nd a.fr ·· · ··· s/2s/2022
NA= Per the CAP and SCO, not sampled
Nitrate Pumping System Started in January 2013
120
128
126
116
121
129
129
As of March 2012 both north and socih wild !ile ponds no longer receiving water.
Table 5 of 16
Historic Nitrate, Nitrate+ Nitrite and Cloride Concentrations in Monitor Wells Up to the 2nd Quarter 2022
Nitrate Contamination Investigation
TWN-9
Sampling Event
15.tqtr ..
2nd. (ltr ..
3rdCltr. .....
4th Qtr
3/23/2010
·: ·:: ~h/2ojo
7/15/2010
i219/2oio
2/1/2011
.. :: 4J_2sj2oji
Parameter
GWQS
Nitrate, Nitrate + Nitrite
L
lst(ltr. ....
211d. (ltr ..
3r.dqtr. ....
4th Qtr
. ... 7 /29/_291.1 4'<'-"
10/20/2011
2nd Qtr 4/20/2012
3r.d Cltr. ... . . .. 7/31/2012
4th Qtr io/i.7 hoii
15.t(ltr
2nd Qtr
TWN-11
Sampling Event
Parameter
GWQS
White Mesa Uranium Mill
TWN-10
Sampling Event
183 1st Qtr . 3/23/2010
.. !7.5. 2..n.~.Q!r: ........... 6(2/~61g .
..... 2.1.0 3rd. (ltr ..... J/1.4/2019
172 4th Qtr 12/8/2010
...................... 2,17 ls!. (ltr 1/26/2011
. ........ 1.92 2n~ Q!r ::: · · ·· 4/?i/~oii : ·
208 3rd Qtr 7/27/2011
134 4th Qtr ·· 10/isiioii
.... 2,02 1st Qtr 1/10/2012
1W4-65 dup ofTWN-10
... 2.09 2nc1 qtr ::: ::: :: ,ijjci/?612 :: ...
.................. 2.1.5. 3rd. Clt.r ........ J/2.5/2.01?
194 4th Qtr 7/16/2012
ls!. qtr, ?0.1~ .
2nd Qtr 2013
TWN-12
Sampling Event
Parameter
GWQS
1.5
1.0
0.2
1.3
0.3
1.2
0.1
0.2
0.8
0.7
0.9
0.6
0.12
Parameter
GWQS
Chloride (mg/I)
NoGWQS
54 . ........
30
21
28
40
28
28
33
44
28
33
30.8
Nitrate, Nitrate + Nitrite
(10 mg/L)
Chloride (mg/I)
NoGWQS
Nitrate, Nitrate + Nitrite
(10 mR/L)
Chloride (mg/I)
NoGWQS
15.t_qtr_ . 3/17/2010
211d. (ltr ·· I ·· ::: ~1i/2ojo .. .
3r.d Cltr .... 9/.27 /201.0 .. .
4th Qtr 12/8/2010
15.tqtr 1/.27/201.1 ..
2nd Clt! ... ·· [ 4/26/2011
3rd qtr : ? /27 j2oji :::
4th Qtr . 10/17/2011
1st Qtr 1/10/2012
:ateofTWN-11
;r; !! ••• 1 ]~a~;~;; ••· ·•· ··
lst_qtr 2.91.3. .. NA
2nd Qtr 2013 NA
1.4 ... J.3 ls~ q.tr. ... 3/17/2010
1.3 .. 72 2_nd Qtr •• J,t#GJ#o10 •..
1.4 ....................... J6 3rd. (ltr . ... ... .. 7/12/2.019
1.4 72 4th Qtr 12/7/2010
1.4 ... ... ... ... ... ... ... ... 84 1st q.tr .. .. ... .. 1/26/2.01.1. .
1.4 ... J.6. 2.n~ .Q!r.. 4/26/2011
0.1 76 3rd. Qtr :: )i?Gi?6i}
1.6 76 4th Qtr 10/17/2011
1.6 69 1st Qtr 1/10/2012
1,6, 70
1.6 .. Jl. 2nd Qtr ... .. 4/18/2012
1.8 J 7 3rd. (ltr . 7/2.5/2.0.1.2
1.84 76.4 4th Qtr
1st (ltr 201~
2nd Qtr 2013
7/16/2012
NA
NA
0.7 113
0.8 106
0.7 112
0.7 103
4.2 87
1.0 109
0.6 102
1.2 87
0.9 104
1.2 106
1.4 102
1.41 101
TWN-11 abandoned on Julv 31, 2013 TWN-12 abandoned on Julv 31, 2013
Shaded= Nitrate, Nitrate+ Nitrite concentrations greater than the Ground Water Quality Standard of 10 mg/I
NA= Per the CAP and SCO, not sampled
~,JJ:~l\rr~~~l ~lln~W~~fl:kD ~J~Jf:lq]~
Table 6of 16
Historic Nitrate, Nitrate + Nitrite and Cloride Concentrations in Monitor Wells Up to the 2nd Quarter 2022
Nitrate Contamination Investigation
TWN-13
Sampling Event
Parameter
GWQS
White Mesa Uranium Mill
TWN-14
Sampling Event
Parameter
GWQS
Nitrate, Nitrate+ Nitrite Chloride (mg/I)
(10 mg/L) No GWQS
Nitrate, Nitrate + Nitrite
(10 mg/L)
~t(ltr ?/1?(291._0 :"0:1.. .. . ........ 47. 1~. qtr. 3/24/2010 2.9
2.9 2~d. (ltr . .. 5/26/2010
3r.d Cltr. .. ... . .•• 9{27 {1 .. 9io ... 0.1 .. .. . 4.9 2n~ (ltr ··· G}i./2010 ·
0.2 .................... __ 53. 3rd. Q.tr . ·•• •• )/1.5/2.019. . ··· ·· ··· ··· ··· ··· ··· ··· ----·· 3.5
4th Qtr 12/7/2010 0.4 57 4th Qtr 12/10/2010
~t_(ltr_ 1/25/2011
2nd. Q.tr . . 4Ji.6/2011 <0.1 ···
3rd Qtr ... .. • : ? /2~/291.i ••. ··· -
4th Qtr 10/17/2011 <0.1
.. 1-03 ls!. g.tr. . 1/28/2011
................ _49 2n~ (ltr .....•. 4(2.7/2.Dii ...
0.1 . 49 3rd. O.tr . 7/29/2011
48 4th Qtr ...... 1oii<Ji201i .
1.6
~t(ltr ............. 1-/9(291._2 :"0.:1 __ ..
2nd. Clt.r .. 4/18/2012 <0.1
3r.d Cltt •••• ? {2~{29fi ........ .
. ......... 4.6. 1st. Cltr. ... 111112012
. . ... . . . . . ... . . . ... ... . ... .. 53 2n~ Q!r .. 4/2oizoi2 .
0.1 .. ... 48 3rd Qtr · · · ·· -7/27/2012
TW,4.70 duplicate ofTWN-14
4th Qtr 10/15/2012 <0.1 ..... 41:3 4th citr ... ... .. iiiii2012
15.t(ltr .. 2013 NA 1st_ Cltr. .... 2013 NA
2013 NA
2013 NA
2013 NA
l-2_n_d_Q.a..tr _ _._ ___ 2_01_3...._NA _____________ --t2n~ (ltr
TWN-13 abandoned on July 31, 2013 3rd. O.tr ..
4th Qtr
ls!. gtr ...
2n~ Cl!' ..
3rd. Q.tr
4th Qtr
1st Qtr
2nd(l!r
3rd. Q_tr
4th Qtr
2014 NA
2014 NA
2014 NA
2014 NA
2015 NA
2015 NA
2015 NA
2015 NA
2016 NA
2016 NA
4.2
3.7
3.5
3.5
3.9
3.5
3.4
3.7
3.8
4.03
Chloride (mg/I)
NoGWQS
24
30
26
28
24
30
25
27
26
27
27
27 ......... ----
27.4
1st Cltr. ....
2n~Q!r
3rd. Q.tr
4th Qtr
>----------------ti
NA= Per the CAP and SCO, not sampled
1st. Cltr. ...
2ndQtr ..
3rd. Q.tr .
4th Qtr
lst.Cltr. ...
2nd .Cltr
3rd. O.tr ..
4th Qtr
1st (ltr ...
2nd qtr ..
3rd. O.tr
4th Qtr
1st. Cltr ...
2.n~.Cl!' ..
3rd. Q.tr .
4th Qtr
1st Cltr ....
2nd (ltr
3rd. Q.tr ..
4th Qtr
lstQtr 2ric1ci,
2016 NA 1-----------------2016 NA
2017 NA
2017 NA
2017 NA ...................
2017 NA
2018 NA
2018 NA
2018 NA
2018 NA
2019 NA
2019 NA
2019 NA
2019 NA
2020 NA
2020 NA
2020 NA
2020 NA
2021 NA
2021 NA
2021 NA
2021 NA
2022 NA
2022 NA
Table 7of 16
Historic Nitrate, Nitrate + Nitrite and Cloride Concentrations in Monitor Wells Up to the 2nd Quarter 2022
Nitrate Contamination Investigation
TWN-15
Sampling Event
Parameter
GWQS
Nitrate, Nitrate+ Nitrite
(l0mit/L)
White Mesa Uranium Mill
Chloride (mg/I)
NoGWQS
TWN-16
Sampling Event
Parameter
GWQS
Nitrate, Nitrate + Nitrite
(l0mit/L)
Chloride (mg/I)
NoGWQS
1st Qtr 3/18/2010 0.7 43 1st Qtr ..
2nd Qtr ·-5/2P/ioio ~· _______ l_.o..., ...•.•.•.....•.•.•. 39 2nd. Qtr
3/17 /20101---------__ 1cc·cc2+------'3-'5
3rd.Qtr. 7/13/2010
4th Qtr 12/9/2010
1.0
1.2
..................... ..36 3rdQtr
38 4th Qtr
5/27/2010 1.3 35
9/27/2010 ~· 2.6,-.....-.-... -... -.... -.... -.... -~-:5-
12/9/2010 2 30
lst.Otr... 1/27/2011 .............. 1.:~ .............. 43 1st Qtr 1/27/2011 4.6 34
2nd Qtr. 4/27/2011 ................................. 1.6 ___ 4_9-t?.r:,d Qtr
3rd.Otr. 7/28/2011 1.6 47 3rd Qtr
4/27/2011
7/27/2011
1.6 39 ........................ , _______ _
4th Qtr .... . . lO/i9/2011 . 1.3 38 4th Qtr 10/18/2011
31
34
lst.Otr. 1/11/2012 1.5 2nd Qtr ..... . .4/io/ioii. 1.6
1W4-70 dupliate of TWN-15
!~~·6:; ····+1~~!~~~~~~ .. . ········
TW4-70 duplicate ofTWN-15
1.7
2.1
1.79
2.0
........... 38 lst.Qtr ....
46 2nd. Otr ....
46
1/10/2012
4/19/2012
............................... ____ ,
... !i() 3-r~.Cltr
47 4th Qtr
44.4
7/25/2012
7/16/2012
2.4 ..... ,. ......... , ............... .
2.50
33
50
33
32.1
1st Qtr..... ..J C>B .N.":......... 1st Qtr
t-2_n_d_Q~t•-~ ___ 20_1_3~N_A __ --,---,----------t2nd.Qtr ..
TWN-15 abandoned on July 31, 2013 3rd Qtr.
4th Qtr
2013 NA
2013 NA
NA= Per the CAP and SCO, not sampled
1st Qtr.
2nd.Qtr
3rd.Qt, ..
4th Qtr
lst.Qtr
,. ................. ,, ..... . 2013 NA
2014 NA
2014 NA ............ ,,. ............... .
2014 NA ., .• ,, ...... ,, ........................ -w, ..... , .. .
2014 NA
2015 NA ........ ,,.,., .. ,_,,._,,. ........ ,.
2ndQtr ........ 2-0~5. r::!_A··----------------··-··-··-·
3rd Qt~r_....,. ___ 2015 NA
4th Qtr 2015 NA
½t g.tr, 2016 NA
2n~.Otr 20161-N_A _____________ -1
3rd Qtr __ 2cc0ccl;c.6l-'N-"-A-'---------------I
4th Qtr 2016 NA
1st Qtr 2017 NA
2~d Qt~ . . ... 2017 i:N.,,A .. : ..................................................................................................... 1
3rd Qtr 2017 i:.N,,A .. : ..................................................................................................... 1 4th Qtr 2017 NA
1st Qtr... 2018 NA ........................ .
2nd.Qt,.. . 2018, .. N ... A ....................................................................................................... ,
3rd. Qtr ................ 2-Cl~.S., .. N ... A ....................................................................................... , .............. ,
4th Qtr 2018 NA
1st Qtr 2019 NA
2nd.0tr.... 2019, .. N .. A ....................................................................................................... ,
3,r~_Cltr, . ...... . .. .. 2019, .. N .. A ......................................................................................................... ,
4th Qtr 2019 NA
1st Qtr.. 2020 NA
2nd. Qtr 2020 NA
3rdQtr . . ... 2-9?.9. ~.": ...
4th Qtr 2020 NA
1st Qtr 2021 NA
2nd Qtr 2021 NA ~r~_9!r. .... -~~ ...... ~Q?.!_, ... N .. A ...................................................................................................... ,
4th Qtr 2021 NA
lstQtr
2nd Qtr
2022 NA
2022 NA
Table 8 of 16
Historic Nitrate, Nitrate + Nitrite and Cloride Concentrations in Monitor Wells Up to the 2nd Quarter 2022
Nitrate Contamination Investigation
TWN-17
Sampling Event
Parameter
GWQS
White Mesa Uranium Mill
TWN-18
Sampling Event
Parameter
GWQS
Nitrate, Nitrate+ Nitrite Chloride (mg/I) Nitrate, Nitrate + Nitrite Chloride (mg/I)
lstQ!r .. 3/24/2010~4 _ NoG~~
5
.7.8 lstCl.t~ 3/17/2010 (lOmiul) 1.6 NoGWQS 42
2._ncl Cl.tr..... 6/3/2010 blt!~~~t::-t~ .......................... s1. 2nd Q\r ... ... .. •• 6/1/2oig .. 1.8 63
3(dCl.t( ......... ?/15(201.0 ... 8.9 .......... 66 3rd Qtr 9/27/2010 . 1.8 64
4th Qtr 12/10/2010 8 65 4th Qtr 12/9/2010 1.6 59
l~tQtr .. . .... ?fl/201.1 .. 8.6 90 1st Qtr .. ... .. .. . 1/2.7/2.0.1~ . 1.4 61
2nd Qtr 4/28/2011 9 _ 81 2nd.Qtr.. .. 4/26/2011 1.8 67
3rd .. Qt< ..... 7(2~(201.1 ••• 8.5 74 3rd Qtr 7/28/2011 1.8 ................... 65 4th Qtr 10/20/2011 8.1 71 4th Qtr ......... 1oi18/2011 . ... 1.9 60
1st Qtr 1/12/2012 8. 7 79 1st Qtr 1/10/2012 1.9 64 !~.9!!.::. ~::_~2_y!.0J:~ ............. 9:i so 2ric1 tiir .. .. 4/19/2012 ........... ii. . 64
!I~&; ··· ··· · 1b~mm1 ··· ··· ··· ··· ··· ··· ··· ··· ··· ··· ··· ··· ··· 9~6~1 ··· ··· ·-··· ··· ··· -a:~ ~rn g:~ ··· -•• ·· i~i~i~i; ,_ 1~~ ·· 67~~
1st Cl.tr .. . 2013 NA 1st Cl.tr .......... 2/1.8/2.01} ,_ 2.27 68.7
2nd. <:l!r . .. . ... ... ... ... 201.3 t.j,\ .. _ _ _ _ ..................... _ _ _ _ 2nd Qtr 4/23/2013 2.32 64.3
TW4-6S dup ofTWN-18 2.46 66.1
o-3-rd_Q_t_r_~--TW-2~-~-:~/-a~-a-n-do_n_e_d_o_n-Ju-ly_3_1_, -20_1_3 _____ _,!;~ ~( •.•.•• r ~6~~tm~ 2.04 70.4
2.15 67.3
DRC split sample 0.29 74
1st Cl.tr .. ... ... .. 2/1.4/2.014 2.33 68.4
2n~ Qtr .. ... .. ... 5/6/2.01.4 . 2.18 76.5
3.rd. <ltr .. . ..... 8/5/2014 . 1.8 70
4th Qtr 10/8/2014 1.47 74.8
TW4-6S dup ofTWN-18 1.47 72.3
i~~ ~;, ·· ·· I ~jrnm~ 1 73.3
1.35 76.6
TW4-65 dup ofTWN-18 <0.10 76.9
:;~ gt·· ••• •• r 16~t:~i6i~ 0.35 81.3
0.668 69
TW4-65 dup oflWN-18 0.645 68.6
1st Qtr 2/23/2016 0.648 67.6
2nd a.ti .. .. .. 5/11/2016 . . 0.497 69.9
3rd Qtr 7/21/2016 <0.100 52.7
4th Qtr 10/6/2016 0.501 67.4
1st. Cl.tr 2/15/2017 2nd Qtr ··· ··· ·· ··· G}ii2rii.'1 ·
3..'d. <:).tr ••••••• Ji1cii2017. .
0.47 62.l
0.392 63.9
0.419 59.0
4th Qtr 10/4/2017 0.256 56.6
1st. Cl.tr... 1/1.8/2.018 . 0.332 53.1 ••·•• .................
2nd Qtr 5/8/2018
3rd. Cl.tr ••. ·· ·· ·· 8/8/2018
4th Qtr 11/21/2018 .
0.283 57.8 ........ ·········-. 0.348 59.7 ................ _ .. •·••··· ...............
0.16 48.1
1st Qtr 2/20/2019 0.155 46.4
TWN-65 dup ofTWN-18 0.174 49.9
2nd a.tr ... ··· r 5j2cii2019 . 0.129 50.0
TWN-65 dup of TWN-18 0.152 53.3 3rd oi, ... ' I 8i14i2019 . 0.181 46.9
TWN-65 dup of TWN-18 0.184 47.3 4th a.tr ··· ··· r 1011r;i2019 0.162 47.1
OWMRC duplicate ofTWN-18 0.13 43.0
1st Qtr I 1/29/2020 0.224 51.9
TWN-65 dup ofTWN-18 0.249 50.6 ;r;~t ••••••I ~~!!~~~~i • •·· . 0.223 47.4
0.232 44.0
0.208 42.3
TWN-65 dup oflWN-18 0.171 41.9
1st Qtr I 2/17/2021 0.228 46.2
TWN-65 dup ofTWN-18 0.227 46.1
2nd o.i, ...... I 5/25/2021 0.22 44.9
TWN-65 dup ofTWN-18 0.247 44.1 iei 6.tr ..... I 8/1i1202i 0.199 42.9
TWN-65 dup ofTWN-18 0.208 44.1 4th oir -··· r 11iiii202i · 0.245 46.S
1st ot, I 211512022 0.199 40.9
TWN-65 dup ofTWN-18 <0.1 40.S ind o.i, ..... I 5/24/2022 0.34 40.7
TWN-65 dup of TWN-18 0.3 39.6
NA= Per the CAP and SCO, not sampled f~~~ti51h~{ff.~~y;~~;~~~Jfi{.;n~::J
DRC = Utah Division of Radiation Control
Nitrate Pumping System Started i!l Janu.try 2013 _____ _
As of March 2012 i>vth north and south wild life po:ld:; no longer rec~ivlng wat~r. __
Table 9of 16
Historic Nitrate, Nitrate+ Nitrite and Cloride Concentrations in Monitor Wells Up to the 2nd Quarter 2022
Nitrate Contamination Investigation
TWN-19
Sampling Event
lstCl.tr .. . .. 3/23/20;0
2n~ Cl.t.r... .. ~/1/20;0 ..
3rd Cl.tr .. .. . ... 9/27 /20;0 .. .
4th Qtr 12/9/2010
lstQtr . .. 2/1/20;1
2n~ Cl.t.r . 4/28/2011
3rd Cl.tr ... 7 Ji~ji9ii ... ·•·
4th Qtr 10/18/2011
lstCl.tr 1/10/2012
2n~ Cl.tr ~j1~/26i2 •....
3r.d Cl.tr 7 /2fJ(20;2 .
4th Qtr 10/16/2012
lstCl.tr ..
2.nd Cl.tr
3rdQtr
4th Qtr
l~tCl.tr
2ndCl.t.r.
3rd_ Cl.tr
4th Qtr
lstCl.tr
2nd Qtr
3rdQtr
4th Qtr
lstCl.tr
2nd Cl.tr
3rdQtr
4th Qtr
lstQtr
2nd Cl.t.r .
3rd Qtr
4th Qtr
lstQtr
2nd Cl.t.r .
3rd Cl.tr
4th Qtr
1st Qtr
2n~ Cl.tr
3rd CJ.tr. ...
4th Qtr
lstCl.tr ..
2n~ Cl.tr
3rdClt.r ...
4thQtr
lstCl.tr .
2n~ (ltr .. .
3rdOtr. .. .
4thQtr
lstQtr
ind air
2013 NA
2013 NA
2013 NA
2014 NA
2014 NA
2014 NA
2015 NA
2016 NA
2016 NA
2016 NA
2016 NA
2017 NA
2017 NA
2017 NA
2017 NA
2018 NA
2018 NA
2018 NA
2019 NA
2019 NA
2021 NA
2021 NA
2021 NA
2022 NA
2022 NA
TWN-20
Sampling Event
Parameter
GWQS
White Mesa Uranium Mill
Upper Wildlife Pond
Sampling Event
Parameter
GWQS
Chloride (mg/I)
NoGWQS
Nitrate, Nitrate + Nitrite
(10m L)
7.2 .................. ;18 1st Cl.tr... .. 3/;8/~0lO <0.1
6.2 ................ 113 2nd Cl.tr 6/2/2010 <0.1
7.2 .. 113 3r~ (ltr. .. .. .. iti9(2010 ~9-i
107 4th Qtr 12/10/2010 <0.1
.. 114 1st (ltr .. .. .. . 1/31/2011
6.9 120 2nd (l\r . 4/25/2011 <0.1
7.1 113 3rd Cl.tr. •• )/25/2011 <D.i ...
6.5 108 4th Qtr 10/19/2011 <0.1
7 .0 114 1st Qtr 1/31/2012
6.8 117 Pond no longer in service
7.5 117
7.7
Parameter
GWQS
TWN-21
Sampling Event
Parameter
GWQS
Chloride (mg/I)
NoGWQS
<1.0
<1.0
<1.0
<1.0
1
1
1
Nitrate, Nitrate+ Nitrite
(10 mg/L)
Chloride (mg/I)
NoGWQS
Nitrate, Nitrate+ Nitrite Chloride (mg/I)
2nd Qtr
3rd(ltr
4th Qtr
lstQtr
ind ai,
.. 6/3/2021
8/19(2021 .
11/23/2021
2/16/2022 s/is/ioii ·
NA= Per the CAP and SCO, not sampled
1.88
0.96
0.286
0.436
0.54
.... 50 2nd(ltr
... ... 35.3 3r~ Cl.tr
33.6 4th Qtr
31.2 1st Qtr ...... i<J:7 indoir
6/3/~021
.. 8/;9/~021
11/23/2021
2/16/2022 .. s/istioii
(10 mg/L) No GWQS
1.03 41.9
1.16 40.5
0.696 42.6
1.1 40.4
1.1 39.8
Table 10 ofl6
Historic Nitrate, Nitrate+ Nitrite and Cloride Concentrations in Monitor Wells Up to the 2nd Quarter 2022
Nitrate Contamination Investigation
Pizometer 1
Sampling Event
Parameter
GWQS
White Mesa Uranium Mill
Pizometer2
Sampling Event
Parameter
GWQS
Nitrate, Nitrate+ Nitrite
{10 mg/L)
Chloride {mg/I) Nitrate, Nitrate + Nitrite
No GWQS (10 mg/L)
Chloride (mg/I)
NoGWQS
2rid. (ltr .. .. .. Y?/201,0 .. 7.2 .. ... 52 2.nd (ltr .......... 6/2/2.010 0.6 8
8
6
3'.d (ltr .. ... . .. 7/19/2010 6.8 .. 52. 3rd. (ltr. .. . .. J/19/2.010 . 0.6
4th Qtr 12/10/2010 6.5 60 4th Qtr 12/10/2010 0.2
9
8
9
8
lst(ltr 1/1~/201,2 7.1 JS i.st (ltr 1/11/2012 0.1 9
1 1st Qtr 1/10/2012 7.0 · 114 1st Qtr 1/31/2012 0.1 ind ufr .. . .. 4/20/2012 .. .. ... 6:6 ... .. ss 2nd tiir .. ·•· ... ti./i.0;2012 ....... ·•• .. ·•• ..................... 0.2 .. ·•· ·•• ............... ··s
3;:;jh qtT--. · .--. fi;·271;22§i:i ·· ··· ··· ··· ··· ··· ··· ··· _ ··· ··· ··· 1J.6}6··J~··· ··· ··· ··· ··· · ·~s·· _6s· 43.trhd. Qt(ltrr ... ··· ··· ·· 711;21711;· 22·00}122·· -------------.0°.··1'92
4!_.9:1!,__ 10 17 012 --_
lst(ltr ... ... . --.i/i<J/261.3 8.11 56. 7 1st Qtr ........... _ 2/19/2.0.1.3. "" 0.22
9
9.5 -------9.67
2nd. (ltr 4/24/2013 8.88 s.3-3 2ri~ Qtr_ .. 4/2.4/2.013. . 0.172
3rd(~tr ... •• • ••• s/28(20],3 7 .83 ................ __ 55 .. 1 3.rd. (ltr .. ... .. 8/2.8/2.013. 0.198
10.3
9.66 ................. ·-.....
4th Qtr 10/16/2013 6.68 54.1 4th Qtr 10/16/2013 0.36 9.22
DRC split of Piez-1
lst(ltr .. .. . ... ~/13.(201,4 ..
2nd. Clt: _ sn ;2014
3rd (ltr ... •• • •••••• ~/6/201.4 ••.
4th Qtr 10/8/2014
15.tqtr _ ... 2/18/2015
2nd. Cltr .. . .. s/i2ho1s
3rd (ltr 8/26/2015
4th Qtr 10/14/2015
15.tqtr .. .. ?/23/201.6 ...
2nd Qtr 5/12/2016
3rd Qtr 7/19/2016
4th Qtr 10/11/2016
lst(~tr . 2/15/2017
2nd (ltr ......... Yl/201.7.
3rd(~!'...... 7/20/2017
4th Qtr ... 10/4/2017
lst(ltr ... .. 1(1? /201,8
2rid. (ltr . ... . ...... 5./9./201.8
3rd(ltr ... . 8/8/2018
4th Qtr 1ihiho1s
1st (ltr .. 2/19/2019
2nd Cltr . •• . .•• s/30)2019 .•......
3'.d Qtr. ... . 8/14/2019
4th Qtr 10/16/2019
DWMRC duplicate of P-1
1st Qtr 1/30/2020 2~~ cifr •• • ••• s/20/2020 ·•· ··· 3rd Qtr 7/15/2020
4th (ltr ... 11/l.3/2020
15.tqtr ... . . .. 2/18/202.1
2rid. (ltr.. 5/27/2021
3rd Cltr. . . . ••• s/1~/2921
4th Qtr 11/23/2021
1st Qtr 2/16/2022 ind ufr ·· ··· sJ24;io22
DRC = Utah Division of Radiation Control
1.3 60 ORC split of Piez-2 0.27 11
6.79 .. 56J 1.st (ltr .. 1/13/2014 0.169 11.4
?-'P. .. _s2.1 2.n~ q~r ••••••••.•• sji/201~ . ... o.736 11.4
5.1 . 5.s 3.rd. (lt_r 8/6/2014 0.8 12
5.75 57.6 4th Qtr .... io}S/2014 0.755 12.2
6.41 .. ·•· ·•· .$5.9 lst(ttr. ... 2/18/2015 0.749 12.5
5.95 .. 51 .5 2nd Qtr .. 5/12/2015 . 0.646 13.1
4.96 64.2 3rd. Qtr .. 8/6/2015 0.7 15.5
6.17 54.4 4th Qtr 10/!i.~/2_0_1_5,__ _______ o_.6_92-+-____ 13_ . ....,3
8.31 ..... s.6 .. s. 1st. Cltr ............ 2/2.3/2.0.1? .. 0.615 13.4
6.33 59.1 2nd Qtr 5/12/2016 0.665 14
6.78 53.9 3rd Qtr 7/19/2016 0.669 12.4
6.42 58.1 4th Qtr 10/11/2016 0.732 13.4
6. 15 .. ... .. .. .. .. . 54 .. 5 1st qtr. .. 2/15/2011 o.696 12.4
6.6 ... 54.7 2nd Qtr .. .•• 6/1/2017 • ··· 0.345 13.2
6.8 58 3rd Qtr .. .. . J/2.0(2.01? . . 0.555 13.4
6.21 54.4 4th Qtr 10/4/2017 0.684 12.7
6.35 .................... s.s-3 1st. cttr. ............ 1/1. 112.0.1.~ . o. 116 13.o
6.56 .... 58 2n~(ltr. 5/9/2018 0.776 ........ ~~-9
6.66 . ·• ... 63.5 3rd. (ltr ......... s)si20.i.s . . 0.818 15.1
6,7 55.5 4th Qtr 11/20/2018 0.648 12.3
6. 72 ... 56 .. 8 1st Qtr. .. .. ... 2/1.9/2.019 . 0.599 12.9
6.75 ...................... s.9_.4 2ndQ\r. 5/30/2019 0.702 12.6
6.81 6.1 .. 1 3rd. (ltr .. _8/1,4/2.01_9. . 0.606 13.2
7.21 59.3 4th Qtr 10/16/2019 0.573 12.6
6.4 60 OWMRC duplicate of P-2 0.36 21
7.12 ............... _68.9 1st q.tr .......... 1/3.0/2.020 . 0.740 14.2 ............. ···············-···
6.95 .. 6.7J 2nd Q\r 5/20/2020
7.36 .. 63.6 3rd. (ltr ·•• •• •• iii.{)2020 ..
0.679 14.4
0.793 12.7
7.51 63.9 4th Qtr 11/13/2020 0.544 12.9
7.34 .. s.1_.s_ 1st. q.tr. ... . 2/18/2021
7.89 .................. _69.9 2nd(ltr ..••••• )/27/202i <O}
0.401 ..... 15.7
13.9
.JO 3rd. (ltr . 8/19/2021 65.5 4th Qtr ·· ·· ·· 11/23/202i <O.i ··· ··· ··· · · ··· · ··· 7.6
4.69
0.11 14.6
14.8
7 .4 68.8 1st Qtr . 2/16/2022 ·· ··· s:9 ··· ·· ··· ·· ··· ··· ·· ioj 2nd a.ii ··· ··· ·· si2ti./2oi2 ·
Nitrate Pumping System Started in Januilry 201.3 _____ _
As of M.irch 2012 both north .and south wUd !if€ ponds no longer receiving •'i•ater. __
Table 11 of 16
Historic Nitrate, Nitrate+ Nitrite and Cloride Concentrations in Monitor Wells Up to the 2nd Quarter 2022
Nitrate Contamination Investigation
White Mesa Uranium Mill
Pizometer3
Sampling Event
Parameter
GWQS
Nitrate, Nitrate+ Nitrite
10m L
Chloride (mg/I)
NoGWQS
lst(ltr . 3/24/2010 .................................... 1:7 • ___ ... 116
2~d. qtr -: Gi?/2oio 1.6 36
3rd Cl.tr. .. . .. 7 (19/291.0 . . 1.8 35
4th Qtr 12/9/2010 1.8 25
lstQtr 1/31/291.1 1.8 40
2~d Cltr ... . .. 4/25/201.1 35
3'.d Cl.tr. ... 7/25/2011 61
4th Qtr . 10/iilho1i 1.7 12
1st Qtr 1/11/2012 1.8 20 iiid ofr . ... . ... 4j20J2oi2 ... ... ... i:-i . .. ... ... ... 53
!~~![ = · ~~!1~}~1i ·· ··· ··· ··· ··· ··· ··· ··· ··· -··· ... · ... /;:J ··· ··· ··· ··· ··· ··· 2a~i
lstqtr_ ..... ~fi.2-;,/201_3 .. -:----------1.85 ______ 21
2nd. Qtr ... 4:/24/201.3 1.83 21.2
3r.d_ Cl.tr. .... 8(2?/291.3 1.81 22.4
4th Qtr 10/16/2013 1.8 23.5
ORC split sample
1~ Qtr . . .. 1/13/201.4 ...
2~d. Cl.tr 5/7/2014
3'.d Cl.tr. .•• ~/i;J.2014
4th Qtr 10/8/2014
15.t_Qtr.. 2/18/2015 ............ ____ _
2nd Qtr . ... . .•• s/12ho1s
3rd Qtr ... 8/26/2015
0.33
1.87
27
26
23.9
26
28.3
27.3
30.2
54.8
Pizometer 3A
Sampling Event
Parameter
GWQS
Nitrate, Nitrate + Nitrite
(10 m L)
Chloride (mg/I)
NoGWQS
4th Qtr 10/i4/2015
1st Qtr 2/23/2016
· 39.5
27.3
New piezometer P-3A to replace piezometer P-3 drilled and installed in
Ma 2016.
Pizometer-3 abandonded May 2016 (1)2nd Qtr 5/12/2016
3rd Qtr 7/19/2016
4th Qtr 10/11/2016
1.st_ (ltr .. 2/15/2017
2nd Qtr •••••••••• 6/1/2017 3~~ (ltr 7/20/2017
4th Qtr . 10/4/2017 .
1st_ Cl.tr .. .. .. .. 2/1.7/2.018
2n9 p.tr ........ _5/9/2.0.1~
3rd. p.tr . ... ... .. ... 8/8/20.18
4th Qtr 11/20/2018
ls~. Cl.t_r ... 2/17/2019
2n9 Qtr · · · ·· 5/3.0/201~
3rd. (ltr 8/14/2019
4th Qtr · 10/16/2019
DWMRC duplicate of P•3a
1st_ Cl.tr... ... ... .. 1/3.0/2.0_29
2n9 Qtr ......... 5/2.0/2.020
3rd Qtr 7/15/2020 4th oi~ .. ·•• ·· 11/1312020
1st_ Cl.tr... ..2/1.8/2.02.1.
2.n9 p.~r .. ... .. 5/P/2.0_21
3rd. (ltr . ... ... .. 8/1.9/20.21.
4th Qtr 11/23/2021
1. New piezorileter PIEZ-3A to replace PIEZ-3 drilled and installed in May 2016. First monitoring event.
~f(ltR'~~itffffirfrlrffift~l:~~tli'Y':'$=~'~11~~
DRC = Utah Division of Radiation Control
Nitrate Pumping System Started in January 2013 _____ _
As of M.;rch 2012 both rcorth c::nd south wild lifo po;,ds no longe,r receiving water. __
8.33 109
93.8
100
111
124
105
107
94.3
100
122
105
102
104
96.2
83.0
98.0
99.5 ..........................
88.3 .. ·•• ............... -~ ..
82.7
72.8
85.9
85.6
81.5
84.6
91.7 ··· ··· ··· ··· ··· -iiii.o
Table 12 of 16
Historic Nitrate, Nitrate + Nitrite and Cloride Concentrations in Monitor Wells Up to the 2nd Quarter 2022
Nitrate Contamination Investigation
TW4-19(Pumpin1 w.11 mrtlna In
April2003)
Sampling Event
1st (ltr .......... 3(1.6/?00':>
White Mesa Uranium Mill
Parameter
GWQS
Nitrate, Nitrate+ Nitrite Chloride (mg/I)
10m L NoGWQS
5.3 NA
TW4-20 (Pumpln1 w~I statina In
"-"20051
Sampling Event
2nd Qtr 5/25/2005 5.7 NA 2nd Qtr 5/25/2005 3rd cit, •• •• ••• Si~i1~@ · · 4.6 NA ·· ··· ·· ··· ··· 3,dcii, ·· · ·· ··· s/3i/2oos
4th Qtr 12/7/2005 <0.1 81 4th Qtr 12/7/WOS
i.st (ltr .......... }/9/?00.~ ........ ,_ .4: ......... ~6. lst .. Cltr.. .. .. . . .. _ J./9/2rt.J.6
Parameter
Nitrate, Nitrate + Nitrite
(10m l)
Chloride (mg/I)
NoGWQS
?nd(ltr 6/14/2006 5.2 ..... 1~6. 2n.d (ltr ........ Y14/2fXJ.6
~rd Cltr ·· ·· 7/20/2006 · ·· 4.3 . ... .. .. .. .. 1?3. 3rd(ltr 7/20/2006 2.90 134
4th Qtr · · ·· 11/8/2006 · 4.6 134 4th Qtr 11/8/2006 · · 3.50 124
1.s! (ltr 2/28/2007 4 ... 1?3. 1st Qtr ... 2/2~/2f!0.7 4.20 124
?ndqtr J,ii.i(~CXJ.! n?t sampled ................. 2n.d (lt~ ......... ~/2J/2f!0.7 ... 2.30 112
3.r~ (ltr 8/15/2007 4.1 1?9. ?rdCltr 8/15/2007 2.10 117
4th Qtr ........ 16i16i2007 . 4 132 4th Qtr iohg/ccc2;.;.00c..··1-l· --------=c.c.f----..Cl.C..7041
1.st (ltr 3/28/2008 2.2 ...... 1?1. lstqtr . 3/28/2008 132
2.nd Cltr si2s/2008 2.8 · 128 2n.d Cltr i;/i$/zgci8 8.00 191
3.r~ (ltr ··· ·· ••• jiii.o/2.rx:J~ ......... 1~3. 3rd.qtr .... ~/10/2f!0.8 4.44 156
4th Qtr 10/15/2008 124 4th Qtr 10/15/2008 5.51 168
i.st (ltr 3/4/2009 ...... 127. lstqtr ......... 3/4/2f!0.9 ... 5.10 164
2.ndCltr ••. .• .•• sifii2.rx:i~ . . ........................ _ 2.4 ........... 1?? 2n.d Cl.tr ... 6/23/2009 2.90 164
3.r~ (ltr 9/14/2009 <0.1 ........ 4:3. 3rd(ltr ••• 9(1~/icijg 3.30 153
4th Qtr ·· ·· ··· 1ii2ii200CJ •~.1:~·=--"w"'2&7 124 4th Qtr 12/22/2009 187
1.st (ltr 2/17/2010 ·---·---'"---~=--2 f----.. -... -... -... ...cl;c;;.44;.;. ... .j-.1"'5.t;.;.Q.:::,tc;., ,.-... -.. -. ·.i-·.;:;·· ."'?1.;:; .. 1"'1 /..c2c:.o;;.:1.04 .. ------~...CCCc.c.f----..Cl.::.7941
2nd(ltr. ••• 6/1.4i2.616 . .. .. .. .. .. ... ... ... ... .. .. . 4.4 132 2nd Qtr 6/14/2010 5.60 200
J.rd (ltr 8/16/2010 5.9 ...... 14:? 3rd Qtr. ........... 8h6/2010 5.30 196
4th Qtr ........ 1oi1s/zoio . ... .. 146 4th Qtr ... ... .. iohshoio 4.60 203
1st Qtr 2/17/2011 · ................. 135. lst(ltr ?/_17/201.1 .. . .................... 4.40 . 220
2.nd qtr .. . ... .. i;}i/i.oii ... .. .. ... ... .. .. 14~ 2n.d gtr ... 6/7/2011 4.80 177
3rd Cl\r .. . ... 8/17/2011 3.0 .......... 14:8 3rd(ltr . 8h7 h61i 6.50 207
4th Qtr ... ii;1i/zoii . 5.0 148 4th Qtr ....... iihihoii 186
1~ ~!:.. _ 1/23/2012 0.6 138 1st Qtr 1/23/2012
?nd(ltr -G°iG/2012 2.4 .................... 14:9. 2".d Cltr .. . ... ~ ~Gii9µ
J.rd Cltr ..... 9/4/2012 2.5 ..... 149. 3rdCltr 9/4/2012
4th Qtr i.oh,i'i.012 150 4th Qtr .......... 10/3/20ii
1st Cltr _ _ 2/13/2013 ..... 164. 1st Qtr ... ?/_13/201.3
?n_d(ltr . . •.• : 6(si2.013 . 148 2nd (ltr .. 6./5/201.3
J.rd Cltr 9/3/2013 ........................ 119. 3rd(ltr ............ 9./3/201.3 ..
4th Qtr .. 10/29i2013 134 4th Qtr 10/29/2013
1st (ltr... 1/27/2014 1.6 ............... 134: lstQtr ... ~/27/2014.
2.nd Cltr ...... 5/19/i.01~ . 1.3 ..... }?? ?".d Cl.tr ........... 5/1~/201.4
J.rd (ltr 8/11/2014 1.6 .................... l4Q 3rd qtr ... 8/11/2014
4th Qtr ........ 1oi2ii2014 4. 7 130 4th Qtr 10/21/2014
1.S! (ltr . .. .. 3/9/?015 8.56 ... ... ... ... .. ... ... 2?~ 1st Qtr 3/9/2015
2nd Qtr 6/8/2015 .. 180 2nd Qtr ·•• ·•• 6/8(2015 3rd Qtr . ••• 8/31/2.015 .326. 3rdQtr 8/31/2015
4th Qtr 10/19/2015 252 4th Qtr ·· · 10/19/2015.
1.S! (ltr . 3/9/2016 .. ... 276. 1st Qtr . 3/9/2016
?n_d(ltr •••••.•• Si?G/~016 ................. ,2.94: 2n.d (ltr ••• $}ii;/ioi.6
3.r~ ,Cltr, 7/25/2016 .. ... 2~4: ?rdCltr ... 7 /2':>/201.6
4th Qtr ·· · ··· 10/13/2016 200 4th Qtr 10/13/2016
1.st Cltr... 3/8/2017 .................... 4~1. lstQtr ............. 3/~/201.7
2.nd(ltr Gi13/2017 0.243 PS. ?n.d gtr ....... 6/1}/2017
J.r~ Cltr ·• .. .. ii2i,izo11 ... 21.~ ?rd Cltr .. ... .. ! /2~/201.7
4th Qtr ........ 1oi11i2011 . 139 4th Qtr 10/11/2017
1.S! (ltr ........... 3/1.2/?0l.8 . . ....... 1~3. ~st qtr 3/12/2018
2.ndqtr 6/8/2018 0.494 138 2nd Qtr ••••• ~/8/201.8
3rd qtr.. .. . ... 8/ioi2018 •• ••• i.i;~ ~;d cit; •• .. ~/30/201.8 .
4th Qtr ·· ·· ··· 11/28/2018 140 4th Qtr 11/28/2018
1st (ltr . ... .. ... ... 3/8/?0l~ .. ... 197. 1st Qtr .. . .... J./8/201.9
?nd(ltr 6/5/2019 ....... 1~ 2nd (lt~ ... 6/5/2019
J.rd (ltr ·· ·· ••••• 9/4i2.019 . ·· · 0.33 ...... 153. 3rd(ltr ·· ··· 9/4/2019
4th Qtr 12/10/2019 147 4th Qtr 12.ho/2019
1.S\ <:!tr .. .. 2/?3/?021 .
2.nd_Qtr 6/9/2021
3rd Cl\r ·· ·· 8/24/2021
4th Qtr l2/l/lOll hV"''S&'1X:lPW'f"''·""-•t:MrnrZ·:':I
1st Qtr 3/9/2022 2nc1 cii, · ·· ·· r,Jsi2022
104
167
115
172
184
119
128
;5ha4_"4;;;. Nlttat~. N.i!W.,,t 11\tJtte q,nce~tr~tiMs, B!!•t~,.~)t!fle <1t0<\.nd \\[,!~,9uality stap,frd of 10 mg/L, Ht,,"' j
A~ cf Man:h 2012 beth north a!,d .south wHd life ponds nc longer receiving water. __
(2}Pumping well stating in August 2005
9.80
5.76
9.3
289
302
252
250
260
272
254
269
299
292
290
296
365
293
293
318
307
301
290
281
292
293
289
258
282
. 295
272
279
286
307
310
301
Table 13 of 16
Historic Nitrate, Nitrate+ Nitrite and Cloride Concentrations in Monitor Wells Up to the 2nd Quarter 2022
Nitrate Contamination Investigation
TW4-21 (Pumpina well startina In
June2015)
Sampling Event
Parameter
White Mesa Uranium Mill
Chloride (mg/I)
NoGWQS
TW4-22 (Pumpfna well statina In
Au1ust 2005)
Sampling Event
lst.Otr... 3/16/2005 1st Qtr 3/16/2005
2nd Qtr 5/25/2005 ?~tl.(:l~r . . 5/25/2005
Parameter
Chloride (mg/I)
NoGWQS
3rdQtr. 8/31/2005 3rd Qtr 8/31/2005
.. 4_th_Qt_r ___ 1_2--:/7~/,,.200.,..,..,5+---------+-----35_3-t4_t_h_Q~tr_·_+-_1~2/,,_7~/2_00_5 253
~~~;;. 6/i!ji::t:::;:;::,::::::::.:;J:1:·,~,~ ·::~~ ~~d~r. 6/i!j~:: ~~~
3rd Qtr 7/20/2006 357 3rd Qtr · 7/20/2006 · ... · ...... 2;21
ll-4_th-"Qt_r_ .... ➔. _ .... _.i_i,_)a'-')_200.c.. ... c..cG+·I·_···~···~···~·~·-···~·~···~·~··_···~···~···~·~·~-·: ____ · _;;;;29C.C6-t4c.ct;;.ch..;;Q'-'Ctr_·_--·+··_ .... .;;:i;;;:,i;..;;s:..ch::.:oo..=·6 236
1st Qtr 2/28/2007 ..... 306 1st. Qtr. 2/28/2007 34 7
2nd Qtr 6/27/2007 327 2nd Qtr 6/27/2007 273
3rd.Otr. 8/15/2007 .300 3rd Otr...... 8/15/2007 259
4th Qtr ...... "fo/ioh,001 .. 288 4th Qtr . 10/10/2007 238
V1~st0o$tir .. :. l::J3f!/2~8/f!2~00()18~J~l■li!li!tii■■~l==== .. =··3~3~1nl~st0o~t£,r .. =tJ3½/2~8½/2~00~8 519
2ndQtr..... 6/25/2008 8.8 271 2nd Qtr 6/25/2008 ____ 271
3rdQtr. 9/10/2008 7.57 ............ 244 3rd Qtr 9/10/2008 524
.. 4_th_Qt_r_t-l_0.,../1_5/.,..2_00_8 _______ __,,8 __ .o+-____ 2_8_41-4_th_Qt~r--+-l_0~/1_5~/2_00_8 539
1st Qtr. 3/11/2009 8.3 ............... 279 1st Qtr 3/11/2009 177
2nd Otr..... 6/23/2009 .... ·--···--8-:1 ...... 291 2nd Qtr 6/23/2009 177
3rd.Otr. 9/14/2009 9.2 .... 281 3rd_Q_t_r _...,...,_9_/1-4~/2-009 391
t-4-'-th-"Qt"-r-+-_12_,_/ __ 22..,_/ __ 2009c..c..c+---------'-8c..c.4+----_;;;;25c.c6-t4c.ctc.ch..;;Q'-"tr_-+..;;1;;;;2/'-'2"'9'-'/2::.:00..c.9:+ 175
1st Qtr 2/25/2010 .......... 228 1st. Qtr. 3/3/2010 427
2nd .Otr. 6/14/2010 ......................... 266 2nd Qtr · 6/14/2010 134
3rd Qtr . ···s/i3/2010 278 3rd Qtr 8/24/2010 130
t-4_th.....,-'Qt_, ___ 10_,_/:-15~/,,.20 __ 1_0+---------+-----21_0-t4_t_h_Qt~r--+_1_0/~1_5~/2_0_10 134
lst.Otr 2/22/2011 303 1st Qtr 2/22/2011 114
2nd Qtr 6/28/2011 .. .. .. .. .j~~ ?~ti gtr: :· 6/1/2011 138
3rd.Otr. 8/17/2011 .... 287 3rdOtr . 8/17/2011 ············120
4th Qtr 11/16/2011 287 4th Qtr 11/16/2011 174
(l)lst Qtr 1/19/2012 +------:2:'::2::-t8 {l)_ls_t~Qt-r-+--1"'"'/19/2012 36
?~."§ir" --6/13/2012 ... 2 85 2nd. Otr.. .. . Giijiiiiii -~~ 35
3rd Qtr 9/13/2012 142 3rd Qtr 9/12/2012 7.0 121 4tii0:fr 10/4/2012 ... ... ... ... ... . i io 4tti .ot, ···10/4/2012 ''"%~i!E'):wt+"~'f¥!tffi14,0 ......... 130
2/13/2013 .......... 221 (3)i"stQtr-2/11/2013 • Y' -&---· --------i3o lst.Otr .. .
2nd Otr ...... . 6/18/2013 243 2nd. Qtr 6/5/2013 586
3,r,d(:t~r
4th Qtr
9/13/2013 .......... ?9! ~r,~_9.tr. .. 9/3/2013 ............... '.'~!
1st Qtr
2nd.Otr
3rd Qtr
4th Qtr
11/13/2013 ·,t-____ 20::-::6-t-4--t_h .,..O_tr_-t-_10--:/2".".9:-:/2_0_1_3 501
2/5/2014 200 .l,l;! Qtr 1/27/2014 598
5/22/2014 .243 2nd.Qtr 5/19/2014 614
8/27/2014 230 3rd. Qtr 8/11/2014 540
10/29/2014 252 4th Qtr 10/29/2014 596
1st Qtr
(2)2nd Qtr
3/12/2015 255 1st Qtr 3/9/2015 675
·· ·· 6/8/2015 . 494 2nc1 cit, · ·· f,Js/iois · 390
3.;;igtT.--sifi.;2015 3------499 3rd Qtr ·shihois ................ 55!
i o/i.9hois .3 ··· ·· · ·· 413 4th ·ci, ·· ··· ·· 10;19;26:is 567 4th Qtr
1,StQtr
2nd Qtr
3/9/2016 452 1st Qtr 3/9/2016 583
5;2312016 ··· ··· ··· ··· ··· ··· ··· ·42s 2~d iit;·· ····· · s/i3hoi6 598
3rd Qtr 7/25/2016 457 3rd Qtr 7/25/2016 619
4thQtr 10/12/2016 439 4th Qtr 10/12/2016
lst.Otr ...
2nd Qtr
3rd.Otr.
4th Qtr
3/8/2017 ................ '.'~?. !~!.Qtr. 3/8/2017
6/13/2017 .................... 309 2ndQtr ·· · 6/13/2017
7/26/2017 ..... 447 3rd Qtr 7/26/2017
10/11/2017 378 4th Qtr 10/11/2017
DWMRC split TW4--21 310 DWMRCsplitofTW4-22
1st Qtr 3/12/2018 447 1st Qtr 3/12/2018
2~ci iii/ . 6/s)2ois ···· 387 2~d iii, · · 6/shois
3rd iii:r sh.212ois 0.236 · ··· ··· iai 3,d·m;··· · · shihois 4t.hQtr · · iohzhois ., .... ,,.,,,,,,,""" •. ,..""""""'"~;;rri · .. 3',s 4th a.ir' ·1ihshoi s
1st Qtr .. . }!~!2.9!9 . 9.0
2ndQtr. 6/5/2019
3rd.Otr. 9/4/2019
4th Qtr 12/10/2019
1st Qtr 2/19/2020
2nd.Utr.·. 5/27/2020
3rd Qtr ····· · ·· 9/4/2020
4th Qtr 10/28/2020
lst.Otr.. 2/23/2021
2nd Otr. 6/9/2021
3,r,d Cltr, 8/24/2021
4th Qtr ... . i2Jiho2i
1st Qtr 3/9/2022
2nd Qtr 6/8/2022
NA = not analyzed
................. 180 1st. Qtr.. . . . 3/8/2019
.............. 456 2nd. Qtr.. 6/5/W19
478 3rd .. Otr 9/4/2019
339 4th Qtr . 12)io/io19
........... 446 1st. Qtr. 2/19/2020
353 2nd Qtr 5/27/2020
....................... .3-~2. ?r~c:ttr ·· · 9}412020
411 4th Qtr .. .. iohsh.026
.. 454 1st Qtr.. 2/23/2021
461 2nd Qtr 6/9/2021
.. .... ............... .3-?:5-~r.~9!f..... 8/24/2021
227 4th Qtr 12/1/2021
110 1st Qtr 3/9/2022 . . 331 2nd Qtr .... ... . G/s/2022
(1 ) As of Marcl1 2012 both north and soutli wHd life ponds no longer receiving water.
(2i Chloroform pumping well started 619115.
(3i Chloroform pumping well started 1/26/13.
"s!,~~:-.Nit;;;;,-l'~ f;i;.ie concentratiQns erea~er, t.h~i ~?round~t!t~J!ty ;-§.t3.~7<1~q! 10 .~,;;)kU'li
DWMRC = Utah Division of Waste Management and Radiation Control
600
610
607 ..... ,, .............. ..
580
613
567
528
662
588
608
606
.......... . . ,5,7~
514 ,., .. .,.-., ........ ,-................... .
523
442 . 564
Table 14 of 16
Historic Nitrate, Nitrate + Nitrite and Cloride Concentrations in Monitor Wells Up to the 2nd Quarter 2022
Nitrate Contamination Investigation
TW4-24(Pumplnawtll startlnt In
Janu-v 2013)
Sampling Event
?ndQtr, ...... 6/P/?0()7
3.rd(ltr,. .. 8/15/2007 4th Qtr . .. io/i0/2007
i.st (ltr.. 3/28/2008
?nd(ltr, .:· .. 6/25/2008
3.r,d. (ltr ·· 9/i0/2008
4th Qtr ....... io/ish.008
1.st (ltr ... .. . ..... }! 4(?00'}
2nd Qtr. 6/23/2009
3rd.Utr. ·· ·· 9/i4/2009
4th Qtr ......... i2/i6/2009
i.st (ltr 2/25/2010 ?11d(ltr, ... .. ... 6/14/2010
3rd Qtr ... .. 8/?~(?910
4th Qtr 10/15/2010
1.st. (ltr . ... .. ... . 2{1.?/?01,1
2nd Qtr 5/26/2011
3.rdgtr . 8/17/2011
4th Qtr ll./16/2011
1st Qtr 1/16/2012
2;;-;i Qtr --6/6/2012
3.rd (ltr ······· 8/30/2012
4th Qtr ....... . 10/3/2012
1st Qtr 2/11/2013
?~g~~ --;,is/2013
3.rd Cltr s/i6hoi3 4th Qtr ........ io}29}2oii
1.st(ltr 1/27/2014
?nd,Qtr .. ... s/ig/2014
3.rd. (ltr s/iih.014
4th Qtr 10/21/2014
1st Qtr 3/9/2015
2nd.Qtr 6/8/2015
3.rd..Cltr.. .. 8/31/2015
4th Qtr .. io/i9l2015
1st Qtr 3/9/2016 2nd Qtr ... .. ... ·s/23/2016
3rd Qtr .... .. J/?5(?91-~
4th Qtr 10/12/2016
1st Qtr ..
2nd.Qtr.
3rd.Qtr
4th Qtr
3/8/2017 6tiihoii
7/26/2017
10/11/2017
OWMRC split ofTW4-24
1,st.(lt.r. · 3/16/2018
?ndQtr, . 6/14/2018
3rdQtr ······ ... s122ii.ois
4th Qtr ...... iihshois
1.st.(ltr, ....... 3/8./?9!9
?nd, Qtr, 6/5/2019
3.rd(ltr : 9}4hojg
4th Qtr 12/10/2019
1.~t(ltr... 2/19/2020
?nd,Qtr .......... 5/P/?92.0
:3rd. (ltr 9/4/2020
4th Qtr i6/i.sh626
1-st(ltr 2/23/2021
?ncJ.Qtr ··· ·· 6/9/2021
:3rd. (ltr ••• •• : 8/ ?4/iq~i
4th Qtr 12/1/2021
1st Qtr 3/9/2022 2rici O:t, ··· ·· ······· i,/s/2022
Parameter
White Mesa Uranium Mill
Chloride (mg/I)
NoGWQS
TW4-25 (Pumpin1 w&tl s~tlna In
J;anuary2013)
Sampling Event
................. ... ... J7Q ?11d, (ltr 6/27/2007
...................... J91. 3rdQtr ··· ·· ··· 8/15/2007
692 4th Qtr .. .. l.O/lO/i007
...................... J~Q .ls.t(ltr.. 3/28/2 834 2nd Qtr .. ... .. . G/is/ioo8
. .. ... ... ... .. .. 1,18.Q ~r.d,(ltr ·· ····· 9/10/2008
1,130 4th Qtr ... ... .. 10/15/iOOS
...................... l,010 1st. Qtr..... 3/4/2009
. ... ... ... ... ....... ... 7?~ ?11d,. qtr ... 6/23/2009 .... 618. 3r.d,Qtr. ....... 9/14/i009
1,080 4th Qtr .. .. i2/14/i009
.......................... 8.~~ 15.~(ltr 2/23/2010
........................ 63~ 211d q~r ........ 6/14/2010
... ... ........... ... 58,! 3rdQtr.. .. : ........ 8/10/io10
522 4th Qtr .. . 1ojis/io10
............... 1.,10() .1-s.~. Cl\r...... 2/16/2011
............... 1.,l!Q 2t1d,(1tr. ••• 5/25/20if
............. 9?! ~r.d. qtr. 8/16/2011 608 4th Qtr ....... ii.iish611
373 1st Qtr 1/16/2012
........ }?? ?11d,(ltr sniiiiiii
....................... 48~ 3rd,Qtr. .. .... .. 9/4/io12 405 4th Qtr ... .. io}:i/io12
1,260 1st Qtr 2/11/2013
Parameter
9.04
Chloride (mg/I)
NoGWQS
395
382
358
374
344
333
366
332 ........ , ........ ,,.,.._,,,_ ..
328 ................ ,. ...
328
371
296 , .. , ........ , .. , .. , .. , . ._, .. _, .. .
306 ..................
250
312
315
287
334
338
190
916 (2)2ndQtr -6/5/WB ----------524 136
119
88.6 ....................... ~98. ~rd(ltr .... ··• j}4(20i3 5.69
1,030 4th Qtr 10/31/2013 6.1
. .. .. ... .. ... ... 8Q~ 1~ qtr ... ... . . .. YPl2-Q1.4 ... 2.16 85.7 ............................
1,020 2nd Qtr 5/19/2014 1.21 51.1
~,l?Q ~rd Qtr •••••• : j/\~(2,0i~ : .. 1.6
1,050 4th Qtr 10/21/2014 1.03 =:=:=: .. ·=·· ·=·· .].~~¥~ .. r1-~st::Cq~_t_(r=····JtJ3019~1~20~1~5llffllllllllll. ·1· 1.;;tJ;" ....
67
58.1
310
58.3
69.2
93.7
................... p9Q 211d,qtr ............. Gis/io1s 1.14
...................... 78.8. ~r,d(l\'.. .......... 8/31/2015 1.63
909 4th Qtr . .. 10/19/iOlS 1.78
DWMRC split ofTW4-25 1.50 94
..... ~8~ 1st Cltr ........... 3./9(201.6 ... . 0.837 .............. , ...
771 2nd Qtr 5/23/2016 0.959
iiso 3rd iitr ····· ·· iiisiio16 ··· 1. 78
62.7
75.5
74.1
59.8
285
ioio 4th air ··· ·· ioJiihoiG ··· · ·· · · ·· · ·· ·· ·· ·· · ·· ·· i.2.i ·· ·
. . ... ... . .. .1-,Q~ 1.s~.qtr 3/8/2017
1,08Q 2.ricl(ltr : jjj3(2017, ....
..... ········ ...... 1,2'3Q 3r.d,9tr. 7/26/2017
895 ~th,(ltr •·••• •• iojjiji~i7 •••···· ... 1,100
................ 1,3?Q ~!.Cltr. . 3/12/2018
..... J9? 2.n.cl(ltr : ••.••• 6/1~/igfs ••····· ........................... 996 3rd.Qtr .. 8/22/2018 1,100 4th Qtr .... .. 11/28/2018
0.976 69.8
1.23
1.29
2.23
.. .............. , .. ..
70.1
68.0
70.5
1.14 60.3
0.810
0.634
0.639
...................
69.1
59.70
65.0 ... ....... ... ... ... 1,,~9 15.! (ltr 3/8/2019
.... ······· ······· 1,02Q 211cl(ltf. . .. ... 6/5/2019 .. . ... · ..................... 9:~2.1
...... ······· ... 1,1'3Q 3-rcl_<:l!r ....... ·•: .•• 9_/4/2ofg_ ••
59.0 ""'"''••········--"'"''
1,090 4th Qtr 12/10/2019
.. ... ... 1,0!Q 15.tQtr 2/19/2020
.. ... ... 10,?Q 2.11cJQtr ••.••.••• ~(2.?(1,Q?D •••.....
.................. 110,Q 3rd,Qtr . 9/4/2020 1050 4th Qtr .... .. 10/28/2020 .....
. .. ... ... ... ... .. 1,PQ 1st Qtr. 2/23/2021
. .. . .. . 9.3-8 ?11clqtr. .. .. Gi9/i.oii ..
.10,10 :3rd,Qtr •••.•• j/i,~(1,Ql,i ...
1140 4th Qtr 12/1/2021
890 1st Qtr 3/9/2022 ·· ·· ·· ··· ·· ·· ·· 9« 2rici iii,······ · ··· ··· 6/s/ioi:i. ··
0.548
0.994
1.6
3.43
1.57
0.793
0.978
58.1
73.10
86.0
76.8 .............. --67.3
61.3
100.0
55.1
69.3 ................
93.7
As or March 2012 both north and SOlilh wild Hfe ponds no longer receiving water
,Ehlorofonn pum · started January 2013.
OWMRC = Utah Division of Waste Management and Radiation Control
Table 15 of 16
Historic Nitrate, Nitrate+ Nitrite and Cloride Concentrations in Monitor Wells Up to the 2nd Quarter 2022
Nitrate Contamination Investigation
TW4•37(Pumpina well startina in
June201S)
Sampling Event
Parameter
White Mesa Uranium Mill
Chloride (mg/I)
NoGWQS
2.ndQtr .. . . .. 6/8/2.0 345
3.rd Qtr 8/31/20 374
4th Qtr ... . . ioiiCJ/20 399
1st Qtr ,,, . . __ 3/9/20 332
2.ndQtr .. . . _5/2.3/2.0 389
3.r~ (ltr. 7 /25/20 294
4th Qtr . ioii2i20 304
;st Cltr 3/8/2.0 305 .
2.ndQtr ... .. ... 6/!5/2.0 281
3.r_~ (ltr ... _ 7/2.6/2.0 277
4th Qtr 10/11/20 255
;s! Cl!r 3/12/20 263
2.nd Qtr .. 6/8/20 275
3.r~ Qtr ,,, . ,,, }i,12.212.0. 387
4th Qtr 11/28/20 264
~t (ltr . 3/8/20 209
2.nd Qtr .. ·· ·•• .•• 6/5/2.0 250
3.rd (ltr .......... 9/4/2.0 228
4th Qtr 12/10/20 220
;st Cl!r . 2/19/20 236 2nd Qtr ..... ·•• s/2ii20 321
3.r~ .Cl!r.. 9/4/20 273 4th Qtr ....... ioi2s/i.o 254
~.! Cl!r 2/23/20 242 2.nd(ltr ........... 6/9i'io 176
3r.~ (ltr •• •• ••• si2.4/ ,, 220
4th Qtr 410
1st Qtr 414 2ri<10:i, ·· ··· ··· ·· · ··· ·· 216
isi!ade?.;;,, . oo:~~-t~.f!u<!llly;&~~I!lef!<r;"'1.~i1f¥D
Table 16 of 16
Historic Nitrate, Nitrate+ Nitrite and Cloride Concentrations in Monitor Wells Up to the 2nd Quarter 2022
Nitrate Contamination Investigation
MW-30
Sampling Event
2nd, Qtr 6/22/2
3'.d O.tr. •• ••• • ••• 9/22/2
4th Qtr 12/14/2
1st 0.tr __ 3/22/2
2~d_ Clt.r ___ .. _ .•• Nii/i
3t d Cltr. ___ _ __ 9/13/2
4th Qtr 10/25/2
lst_O.tL ... __ ... 3/15/2
2nd Qtr __ ___ _ _________ } __
3r.d __ Cltr. __ ... ___ 8/_2?/2
4th Qtr 10/24/2
15.tQtr ?/19./2 __
2~d. <lt.r __ ___ 6/3/2
3r.d qtr. ... . •••.•• ~h/i
4th Qtr 11/5/2
15.t qtr ___ _ -_____ 2.l?/2
2_nd_ (ltr __ 5/13/2 __
3rd_ Cltr. ... 8/24/2
4th Qtr 10/14/2
15.tQtr __ _ 2/9/2
2~d Cltr ·· 4/27 h
3'.d Cltr. _ 9/14/2
4th Qtr 12/14/2
15.tqtr. .. _ ... 2./1/2_
2nd, (ltr 6/20/2
3'.d Cltr. ___ _ 9/7 /2
4th Qtr 12/12/2
lst<lt'. __ 3/14/2
2_~d_ Cltr __ _ __ 6/1~/2_
3r.d<ltr. ___ 9/19/2
4th Qtr 12/2Gh
15.t qtr __ 2/26/2
2_~d_ Cltr _ __ 5/15_/2
3r.d_ Clt_r ___ _ __ .? /19/2
4th Qtr 11/20/2
15.t_Qtr __ 2/25/2
2nd, Cltr _ ·· ••• ~l~/2:
3r.d __ Cltr. ... _ 9/9/2
4th Qtr i.ihoh"
ls,tQtr _2./4_/2
2~d Cltr ...... 4_/~/2
3_rd __ Cltr. _ __ 8/11/2
4th Qtr 11/11/2
15.t Qtr __ ?/10/2
2_~d. (ltr ... . ..... 5_/4/
3rd_Cltr
4th Qtr
15.tQtr
2nd. Cltr ..
3rd (ltr ... _ ... 8/14/ ...
4th Qtr 11/1/20
lstCltr __ _ ___ ?/22/2
2~d. (ltr _ 4/12/20
3'.d Ott ... . ••• iJ/1i/20
4th Qtr 10/22/20
Parameter
White Mesa Uranium Mill
Chloride (mg/I)
NoGWQS
MW-31
Sampling Event
125 2nd Qtr ...... __ 6(2.2/2.0()?
12_5 3rd Qtr .. _ __ _9/22/2.005
128 4th Qtr 12/14/2005
__ ...... 1.25 1st O.tr 3/22/2006
_____ ... ___ 1.24 2nd Qtr .. .• 6/2.1(1006
......... 1.18 3rd. (ltr 9/13/2006
124 4th Qtr ··· ·· 10/i.S/2006
__ 1.25 1st_ Cltr 3/15/2.0()7
2nd Qtr 2007
126 3rd Qtr .. _ 8/2.2/2.0()7
122 4th Qtr 10/24/2007
118 1st (ltr 3/19/2008
125 2nd Qtr 6/3/2008
121 3rd Qtr ......... 8/4(2.00~
162 4th Qtr 11/5/2008
_ .. 113 i.st Cltr 2/3/2.00'!
1._2_2 2n_9 Qtr ....... __ 5/1._3/2.00'!
...... 11_8_ 3rd. (ltr _ _ __ 8/2.4/2.00'!
129 4th Qtr 10/14/2009
........ ____ ...... 127_ 1st Cltr ... 2/9/2010
__ ___ __ 97 2.nd Qtr _ . .. si21i2010
__ 111 3rd. Cltr ___ .. 9/13/2010
126 4th Qtr 11/9/2010
128 1st gtr. .. 3/13/2012
...... 1._31 2nd Qtr 6/18/2012
.. ___ 1._30 3rd. Qtr .. •• •• •• 9(1.8/2.012
122 4th Qtr 12/18/2012
.. ___ 129 1st_ gtr. .. . ... __ 2/1.9/2.013
___ 119 2nd Qtr 5/13/2013
__ 130_ 3_rd. Cltr ·· ·· ·· ··· 7/9/2013
124 4th Qtr ........ 1iiiaj'i.013
__ ......... ___ .... _ 1.35 lst_Clt'. .. __ 2/1.7/2.014_
128 2nd Qtr 6/3/2014
.. ___ __ __ 1.39 3rd Cltr _ ••• ••• •• : J/3i2.0l~
154 4th Qtr 11/4/2014
___ ...... ___ ...... _____ 1.36 1s1 gtr. ___ _ .. _2/2/2.01?
.................. ____ 1._42_ 2.n9 Qtr 4/7/2015
_____ 1.65 3rd. O!r .. ... .. siioi201s
140 4th Qtr .. ... .. 11/9/2015
__ 1._45 1st_ O.tr. ... 2/10/2016
__ ......... ___ .... __ 1.39 2nd Q!•. ___ •••••••• 5/3/2.016
___ 1.50 3rd Cl!.•... 8/16/2016
143 4th Qtr .. ... .. 11/1/2016
___ ............ ___ .. ___ 1.50 1st_ O.tr ___ .. _ _ ... _2/7/2.017
......... 146 2nd Qtr 5/1/2017
________ 173 3rd. (ltr ··· ··· ·· 8/14/2017
156 4th Qtr .. ... .. iijij2ci1',
.. ___ 1._5_8 1._st_ gtr. 212012018
___ 1._4_5 2n9 Qi• ··· ·•• •• :4j1ii2.cii~
__ ... 1.83 3rd. (ltr __ 9/10/2018
140 4th Qtr .. 10/24/2018
lst __ Cltr_ _ __ ?/1'?/29
2nd. (ltr __ __ _ __ 4_/19/
3rd(ltr
4th Qtr
_ 1.67 1st Qtr 2/12/2019
. ;.;;>H'ii!l!;;;:'i*l··· .............. ___ 1.38 2n9 Cltr. ·•• ••• •• i,/1oi2.ci19
____ 1.81 3rd. (ltr ....... J/1.6/2.019
170 4th Qtr 10/9/2019
15.tQtr ...... ____ 182 1st_ Cltr ___ _ __ 1/1.5/2.029
2nd Cltr _ .. _ ...... 4/6
3'.d Cltr. __ ___ _ ____ 7 /~/
__ 195 2nd Qtr 4/6/2020
.. ... .. ___ .. __ __ __ 1.85 3rd. Cltr _ ••• ••• •• ·•• 1)112029
4th Qtr 12/8/ 166 4th Qtr 12/7/2020
15.t Qtr __ ___ _ _____ 3_/~/ 192 1st O.tr. ............ 3/9/2.021
2~d. Cltr _ __ _ ___ 4/14_/ _
3td_ Cltr. ___ 7 /29/2 . 0.6
4th Qtr .. . 10/19/2 .i.i1
_ ___________ 1.62 2nd Qtr_ __ 4/13/2021
188 3rd Qtr ·· 7/27/2021
182 4th Qtr .. iciii9/202i
1st Qtr 1/17 /2 14.5 inci cit, --· -4/20/i ~if.o 181 1st Qtr 1/19/2022
113 i--,,d Qtr iii'iiiioi'i
Chloride (mg/I)
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
Table 2
Summary of QA/QC Duplicate Sample
2nd Quarter 2022
Parameter GWQS Duplicate of TWN-18
TWN-18 TWN-65 RPO
Nitrate + Nitrite (as N) 10 mg/L 0.34 0.3 12.5 ,.,.,. ... ,.,.,.,.,.,..,.
Chloride none 40.7 39.6 2.7
11:J'.§h lighte¢ ~xceed!tfg PRO f~elitve/f~:ctifferen<j~) of 20!i '\# 0 ' ~ ~ ::&WAil't?fo li!i' .,.x_.j/<_.,o,·x¾
,_
NA= Not Analyzed
Data Discriptions
MW4 MW-26 TW4-1 TW4-2
~.i\_r_<1t_ll __ (n,9/~) 3.90 0.220 0.18 3.10
~itrllt~(9/~) 3.90E-03 ... 2.20E-04 1.SOE-04 3.10E-03
Nitrate (lbs/L) 8.62E-06 4.86E-07 3.98E-07 6.85E-06
Nitrate __ (lbs/9al) 3.26E-05 1.84E-06 1.51E-06 2.59E-05
Total aallons pumoed 93554.5 29385.9 7616.0 11518.1
lbs of nitrate removed 3.05 0.05 0.01 0.30
Gallon_s of nitrate removed 0.25 0.00 0.00 O.Q2
Total lbs nitrate removed from all pumping wells
Total lbs nitrate removed from nitrate pumping wells
Tabel3
DWMRC Nitrate Mass Removal Calculations
Energy Fuels Resorses Inc. White Mesa Mill, Bland, Utah
2nd Quarter 2022
Chlorofonn Pumping Wells
TW4-4 TW4-11 TW4-19 TW4-21 TW4-37
6.00 5.90 1.40 8.90 28.00
6.00E-03 5.90E-03 1.40E-03 8.90E-03 2.SOE-02
1.33E-05 1.30E-05 3.09E-06 1.97E-05 6.19E-05
5.02E-05 4.93E-05 1.17E-Q5 7.44E-05 2.34E-04
11463.2 1473.1 123246.5 91682.5 41998.3
0.58 0.07 1.44 6.82 9.83
0.05 0.01 0.12 0.56 0.80
52
26
Nitrate Pumping Wells
TW4-39 TW4-40 TW4-41 TWN-2 TW4-22 TW4-24 TW4-25
9.00 1.90 6.00 14.0 45.0 35.0 0.880
9.00E-03 1.90E-03 6.00E-03 1.40E-02 4.50E-02 3.50E-02 8.SOE-04
1.99E-05 4.20E-06 1.33E-05 3.09E-05 9.94E-05 7.73E-05 1.94E-06
7.53E-05 1.59E-05 5.02E-05 1.17E-04 3.76E-04 2.93E-04 7.36E-06
31354.2 52135.2 11013.9 16,024.1 22489.0 50341 .7 101724.9
2.36 0.8 0.55 1.88 8.46 14.73 0.75
0.19 0.07 0.04 0.15 0.69 1.20 0.06