DRC-2024-004282

January 30, 2024
VIA PDF AND OVERNIGHT DELIVERY
Doug Hansen
Director
Division of Waste Management and Radiation Control
State of Utah Department of Environmental Quality
195 North 1950 West
Salt Lake City, UT 84116
Energy Fuels Resources (USA) Inc.
225 Union Blvd. Suite 600
Lakewood , CO, US, 80228
303 974 2140
www .energy fuels .com
Re: State of Utah Ground Water Discharge Permit No. UGW370004
White Mesa Uranium Mill-Notice Pursuant to Part I.G.1 (a)
Dear Mr. Hansen:
The White Mesa Mill (the "Mill") performed fourth quarter ("Q4") groundwater monitoring during
the period from October 1, to December 31, 2023 under the March 8, 2021 version of the Mill's
Groundwater Discharge Permit (the "GWDP"). All analytical data needed for comparison to the
GWCLs were received during the period ending January 2, 2024.
Pursuant to Part LG.I.a) of the GWDP, please take notice that the concentrations of specific
constituents in the monitoring wells highlighted in yellow and bold italics in the columns for this
quarter in the attached Table 1 exceeded their respective GWCLs. For ease ofreview, Table 1 has
been formatted to simplify the tracking of any continued exceedances from one monitoring period
to the next by charting ongoing monitoring of the same well in the same row, and by highlighting
exceedances (in color and bold italics).
As a result of the issuance of a revised GWDP on March 8, 2021, which sets revised GWCLs,
requirements to perform accelerated monitoring for certain constituents under Part LG. I of the
previous GWDP ceased effective on March 8, 2021, and the effect of the issuance of the revised
GWDP was to create a "clean slate" for certain constituents going forward.
Part LG.I c) of the GWDP states "that the Permittee shall prepare and submit within 30 calendar
days to the Director a plan and a time schedule for assessment of the sources, extent and potential
dispersion of the contamination, and an evaluation of potential remedial action to restore and
maintain groundwater quality to ensure that Permit limits will not be exceeded at the compliance
monitoring point and that DMT or BAT will be reestablished." The summary below relating to
exceedances includes, for each exceedance, a brief discussion of whether such a plan and schedule
is or is not required or appropriate at this time in light of other actions currently being undertaken
by Energy Fuels Resources (USA) Inc. ("EFRI") or in light of other reports submitted by EFRI,
DRC-2024-004282
Letter to Mr. Doug Hansen
January 30, 2024
Page 2
and as determined by Division of Waste Management and Radiation Control ("DWMRC") Staff.
A description of the other actions and reports which have affected the requirement to submit a plan
and time schedule are as follows:
1. Nitrate + nitrite and chloride in monitoring wells at the site have been the subject of
ongoing investigations at the Mill. Based on the results of the previous investigations,
EFRI and the Director acknowledged that it has not been possible to date to determine the
source( s ), cause( s ), attribution, magnitudes of contribution, and proportion( s) of the local
nitrate + nitrite and chloride in groundwater. EFRI submitted a Corrective Action Plan
("CAP") in February 2012 for nitrate+ nitrite and chloride in groundwater. The CAP was
approved on December 12, 2012 and the activities associated with the CAP are on-going.
Based on information provided by DWMRC in teleconferences on April 27, and May 2,
2011, due to the ongoing activities and actions, the 30-day plan and schedule for
assessment is not required for nitrate + nitrite and chloride exceedances at this time.
2. A Plan and Time Schedule will not be prepared for monitoring wells with two successive
exceedances if those successive exceedances were reported in a previous quarter and/or
were included in a previous Source Assessment Report ("SAR") during the current permit
period beginning March 8, 2021. Inclusion in a previous SAR means that the GWCLs
were modified based on conclusions and actions delineated in the previous SAR which
were accepted by DWMRC.
3. Chloroform and methylene chloride are the subject of the ongoing chloroform pumping
program and are covered by State of Utah Notice of Violation ("NOV") and Groundwater
Corrective Action Order ("CAO") State of Utah Department of Environmental Quality
("UDEQ") Docket No. UGW-20-01. As a result, the 30-day plan and schedule for
assessment of chloroform and methylene chloride exceedances is not required.
It is important to note that under the GWDP, GWCLs have been determined on a well-by-well
basis to reflect background groundwater quality, as defined by the mean plus second standard
deviation concentration, or the equivalent. Accordingly, the GWDP requires that constituent
concentrations in each monitoring well shall not exceed the GWCLs set out in Table 2 of the
GWDP. It should be noted that, because the GWCLs have been set at the mean plus second
standard deviation, or the equivalent, un-impacted groundwater would normally be expected to
exceed the GWCLs approximately 2.5% of the time. Therefore, exceedances are expected in
approximately 2.5% of all sample results, and do not necessarily represent impacts to groundwater
from Mill operations. In fact, more frequent sampling of a given analyte will increase the number
of exceedances due to statistical variation and not due to Mill activity. Additionally, given the
slow velocity of groundwater movement, accelerated sampling at a monthly frequency can result
in resampling of essentially the same water and can lead to repeat exceedances for accelerated
constituents not due to Mill activities, but due to repeat sampling of the same water.
Letter to Mr. Doug Hansen
January 30, 2024
Page 3
1.0 Exceedances in Required Quarterly Sampling Wells
1.1 Quarterly Wells with Two Successive Exceedances
As indicated in the attached Table 1, the analytes discussed below exceeded their respective
GWCLs for two successive sampling periods in Q4 2023. A 30-day plan and schedule
contemplated in Part I.G. l c) of the GWDP will not be required for quarterly wells as noted below.
One-time exceedances and non-successive exceedances are noted on Table 1, but not listed below.
Consecutive exceedances which occurred in previous reporting periods are discussed in previously
submitted SARs.
MW-11
• The chloride concentration exceeded its GWCL in all of the Q4 2023 sampling events. As
mentioned above, a CAP has been submitted and approved to address nitrate+nitrite
contamination which is expected to address chloride in groundwater. The actions specified
in the CAP are currently being implemented; therefore, a plan to address this consecutive
exceedance is not necessary and is not being submitted.
• The nitrate concentration exceeded its GWCL in in all of the Q4 2023 sampling events. As
mentioned above, a CAP has been submitted and approved to address nitrate+nitrite
contamination which is expected to address chloride in groundwater. The actions specified
in the CAP are currently being implemented; therefore, a plan to address this consecutive
exceedance is not necessary and is not being submitted.
• The selenium concentration exceeded its GWCL in all of the Q4 2023 sampling events. A
plan and schedule for assessment was submitted to DWMRC on May 24, 2023. The plan
and schedule was approved by DWMRC by letter dated June 29, 2023 and a SAR was
submitted September 27, 2023. An additional plan to address this consecutive exceedance
is not necessary and is not being submitted.
MW-25
• The chloride concentration exceeded its GWCL in Q4 2023 and December sampling
events. As mentioned above, a CAP has been submitted and approved to address
nitrate+nitrite contamination which is expected to address chloride in groundwater. The
actions specified in the CAP are currently being implemented; therefore, a plan to address
this consecutive exceedance is not necessary and is not being submitted.
MW-26
MW-26 Note: As stated in the September 2009 Statement of Basis (page 23) in support of the
January 20, 2010 revisions to the GWDP, "[i]t should be noted that, because MW-26 is a pumping
well for chloroform removal, concentrations of all constituents in that well are subject to potential
variation over time as a result of the pumping activity. This will be taken into account by the
Executive Secretary in determining compliance for this well." Based on information provided by
DWMRC in teleconferences on April 27, and May 2, 2011, due to the current pumping status as
Letter to Mr. Doug Hansen
January 30, 2024
Page4
part of the chloroform investigation program, the 30-day plan and schedule for assessment is not
required at this time for exceedances of chloroform and methylene chloride in MW-26.
• Chloroform has exceeded its GWCL in all of the Q4 2023 sampling events. MW-26 is
used as a pumping well for the ongoing chloroform capture program and is expected to
yield increased concentrations of chloroform. Because this well is used in the chloroform
capture program which is the subject of separate investigations and actions, a plan and time
schedule to address the consecutive exceedances is not necessary and is not being
submitted.
• The chloride concentration exceeded its GWCL in Q4 2023 and December sampling
events. As mentioned above, a CAP has been submitted and approved to address
nitrate+nitrite contamination which is expected to address chloride in groundwater. The
actions specified in the CAP are currently being implemented; therefore, a plan to address
this consecutive exceedance is not necessary and is not being submitted.
MW-30
• Nitrate + nitrite has exceeded its GWCL in all of the Q4 2023 sampling events. As
mentioned above, a CAP has been submitted and approved and the specified actions are
currently being implemented; therefore, a plan to address this consecutive exceedance is
not necessary and is not being submitted.
• The chloride concentration exceeded its GWCL in all of the Q4 2023 sampling events. As
mentioned above, a CAP has been submitted and approved to address nitrate+nitrite
contamination which is expected to address chloride in groundwater. The actions specified
in the CAP are currently being implemented; therefore, a plan to address this consecutive
exceedance is not necessary and is not being submitted.
• Selenium has exceeded the GWCL for all of the Q4 2023 sampling events. A SAR was
submitted on January 28, 2022. As a result of the SAR, the GWCLs have been recalculated
and accepted by DWMRC. The recalculated GWCLs will become effective upon their
publication in the next revision of the GWDP. As a result ofDWMRC's acceptance of the
recalculated GWCLs, a plan and schedule to address this consecutive exceedance is not
necessary and will not be submitted. Until such time as the new GWCLs become effective,
the exceedances will continue to be noted and reported.
• Uranium has exceeded the GWCL all of the Q4 2023 sampling events. A SAR was
submitted on January 28, 2022. As a result of the SAR, the GWCLs have been recalculated
and accepted by DWMRC. The recalculated GWCLs will become effective upon their
publication in the next revision of the GWDP. As a result ofDWMRC's acceptance of the
recalculated GWCLs , a plan and schedule to address this consecutive exceedance is not
necessary and will not be submitted. Until such time as the new GWCLs become effective,
the exceedances will continue to be noted and reported.
Letter to Mr. Doug Hansen
January 30, 2024
Page 5
MW-31
• Nitrate + nitrite has exceeded its GWCL in all of the Q4 2023 sampling events. As
mentioned above, a CAP has been submitted and approved and the specified actions are
currently being implemented; therefore, a plan to address this consecutive exceedance is
not necessary and is not being submitted.
• The sulfate concentration exceeded its GWCL in all of the Q4 2023 sampling events. A
SAR was submitted to DWMRC on June 24, 2020. As a result of the SAR, the GWCLs
have been recalculated and accepted by DWMRC. The recalculated GWCLs will become
effective upon their publication in the next revision of the GWDP. As a result of
DWMRC's acceptance of the recalculated GWCLs, a plan and schedule to address this
consecutive exceedance is not necessary and will not be submitted. Until such time as the
new GWCLs become effective, the exceedances will continue to be noted and reported.
• The TDS concentration exceeded its GWCL in all of the Q4 2023 sampling events. A SAR
was submitted to DWMRC on June 24, 2020. As a result of the SAR, the GWCLs have
been recalculated and accepted by DWMRC. The recalculated GWCLs will become
effective upon their publication in the next revision of the GWDP. As a result of
DWMRC's acceptance of the recalculated GWCLs, a plan and schedule to address this
consecutive exceedance is not necessary and will not be submitted. Until such time as the
new GWCLs become effective, the exceedances will continue to be noted and reported.
• The chloride concentration exceeded its GWCL in all of the Q4 2023 sampling events. As
mentioned above, a CAP has been submitted and approved to address nitrate+nitrite
contamination which is expected to address chloride in groundwater. The actions specified
in the CAP are currently being implemented; therefore, a plan to address this consecutive
exceedance is not necessary and is not being submitted.
• Uranium concentrations exceeded the GWCL in all of the Q4 2023 sampling events. A
SAR was submitted to D WMRC on April 29, 2021. As a result of the SAR, the G WC Ls
have been recalculated and accepted by DWMRC. The recalculated GWCLs will become
effective upon their publication in the next revision of the GWDP. As a result of
DWMRC's acceptance of the recalculated GWCLs, a plan and schedule to address this
consecutive exceedance is not necessary and will not be submitted. Until such time as the
new GWCLs become effective, the exceedances will continue to be noted and reported.
1.2 Quarterly Wells with New Exceedances Reported in Q4
There are no new exceedances for the Q4 2023 quarterly well sampling program.
2.0 Exceedances in Semiannual Sampling Wells Accelerated to Quarterly
2.1 Semi-annual Wells with Two Successive Exceedances
As indicated in the attached Table 1, the analytes discussed below exceeded their respective
GWCLs for two successive sampling periods (Q3 2023 and Q4 2023).
Letter to Mr. Doug Hansen
January 30, 2024
Page 6
MW-03A
• The selenium concentration exceeded its GWCL in the Q3 and Q4 2023 sampling events.
A plan and schedule for assessment was submitted to DWMRC on November 15, 2023 .
The plan and schedule was approved by DWMRC by letter dated December 5, 2023. A
SAR will be submitted on or before March 4 , 2024. An additional plan to address this
consecutive exceedance is not necessary and is not being submitted.
MW-24
Beryllium, cadmium, fluoride, nickel, thallium, and field pH exceeded their GWCLs in MW-24 in
the Q3 2023 and Q4 2023 sampling events.
The exceedances noted above are addressed in the SAR dated June 27, 2019. As a result of the
SAR, EFRI installed a collocated well to study potential installation issues associated with MW-
24. DWMRC approved the collocated well strategy by letter dated September 5, 2019. In response
to the previously identified exceedances and increasing trends , in 2020 EFRI voluntarily
completed a study of MW-24A (collocated with MW-24) to determine what geochemical and
hydrogeological influences are present which may be impacting monitoring data collected at these
two wells and potentially other wells across the Mill site. The MW-24A study and report included
several additional field data collection and analytical activities based on the conclusions of other
Mill reports.
The results of the analytical and test data collected during the MW-24A study demonstrated that
natural processes unrelated to disposal of materials in the Tailings Management System can
account for the behavior of all trace metals of concern, as well as fluoride, in groundwater at MW-
24 and MW-24A. Bottle-roll test results indicated that naturally-occurring trace metals can be
mobilized at concentrations similar to or greater than in groundwater even without a large pH
decrease, suggesting that agitation alone , such as would occur during routine purging and sampling
oflow permeability wells such as MW-24A , could result in metals mobilization.
Based on the results of the MW-24A study EFRI has voluntarily agreed to implement a MW-24A
Phase 2 study to determine what geochemical and hydrogeological influences are present that may
be affecting monitoring data collected at other wells across the Mill site. EFRI coordinated the
Phase 2 study efforts with DWMRC. DWMRC approved the Phase 2 study plan by letter dated
June 16, 2022. The Phase 2 study will build on the results of the previous study and will
supplement the data using eight other Mill site locations.
As a result of DWMRC 's acceptance of the study strategy, a plan and schedule to address these
consecutive exceedances is not necessary and will not be submitted. Until such time as the study
is complete, the exceedances will continue to be noted and reported.
MW-28
• Chloride has exceeded the GWCL for both the Q3 2023 and Q4 2023 sampling events and
during previous quarters. As mentioned above , a CAP has been submitted and approved
and the specified actions are currently being implemented; therefore , a plan to address this
consecutive exceedance is not necessary and is not being submitted.
Letter to Mr. Doug Hansen
January 30, 2024
Page7
• Uranium has exceeded the GWCL for both the Q3 2023 and Q4 2023 sampling events. A
SAR was submitted to DWMRC on October 19, 2020. As a result of the SAR, the GWCLs
have been recalculated and accepted by DWMRC. The recalculated GWCLs will become
effective upon their publication in the next revision of the GWDP . As a result of
DWMRC's acceptance of the recalculated GWCLs, a plan and schedule_ to address this
consecutive exceedance is not necessary and will not be submitted. Until such time as the
new GWCLs become effective, the exceedances will continue to be noted and reported.
• Selenium has exceeded the GWCL for both the Q3 2023 and Q4 2023 sampling events. A
SAR was submitted to DWMRC on October 19, 2020. As a result of the SAR, the GWCLs
have been recalculated and accepted by DWMRC. The recalculated GWCLs will become
effective upon their publication in the next revision of the GWDP. As a result of
DWMRC's acceptance of the recalculated GWCLs, a plan and schedule to address this
consecutive exceedance is not necessary and will not be submitted. Until such time as the
new GWCLs become effective, the exceedances will continue to be noted and reported.
MW-32
• The chloride concentration exceeded its GWCL in Q3 2023 and Q4 2023 sampling events.
As mentioned above, a CAP has been submitted and approved to address chloride in
groundwater. The actions specified in the CAP are currently being implemented;
therefore, a plan to address this consecutive exceedance is not necessary and is not being
submitted .
2.2 Semi-annual Wells with New Exceedances Reported in Q4
One new single exceedance for the Q4 2023 semi-annual well sampling program is listed below.
• Gross Alpha minus Radon and Uranium ("GA") in MW-24 was above the GWCL in the
Q4 sampling event.
Relative to accelerated reporting requirements, reporting of exceedances is required to be
completed within 30 days of receipt of the last data package for a quarterly monitoring event.
Similarly, accelerated monitoring is required to commence the month following the submission of
the Exceedance Notice for a specified quarter for wells that are being accelerated from quarterly
to monthly and the quarter following the submission of the Exceedance Notice for wells that are
being accelerated from semiannually to quarterly.
Yours trul7.,
iitarJv.t~
ENERGY FUELS RESOURCES (USA) INC.
Kathy Weinel
Director, Regulatory Compliance
cc : Scott Bakken, David Frydenlund , Logan Shumway, Garrin Palmer, Jordan App, Tanner Holliday
Monitoring
Well(Water Constituent Eueeding GWCL
Class)
N itr ate+ Nitr ite (as N) (mg.IL)
Chloride (mg/L)
MW-I I Ma nganese (ug/L) (Class ll)
Sulfate (mg.IL)
Selenium (ug/L)
MW-25 (C lass Chlor ide (mg/L) 111 )
Nitrate+ Nitrite (as N) (mg/L) MW-26 Chloroform (uvl) (Class Ill) Chloride (me/I.)
Nitrate+ Nitrite (as N) (mQ/L)
Chloride (ml!l'L) MW-30 Selenium (ul!l'L) (Class II) Field oH (SU.)
Uranium (ull/L)
Nitrate+ Nitrite {as N) (m~L)
Sulfate(mg/L) MW-3 1 TDS (me/I.) {Class Ill ) Uran ium (ug/L)
Chloride (moll'
MW-03A Selenium (ug/L) (Classm)
MW-05(Class Uranium (ug/L) 11 )
MW-17 Ch loride (mg/L) (Class I.I (}
Bery ll ium (ug/L)
Cadmium (ug/L)
Fluo ride (ml?!L)
Nickel (mw'L)
MW-24 Manganese (ul?/L)
(Class Ill ) Thallium (ul?/L)
Gross Alpha (oCi/L)
Sulfate(me/L)
TDS (me/L)
Fie ld pH (S .U )
Mw-i7 Nitrate+ N itri te (as N) (mg/L)
(Class III)
Fluoride (mg.IL)
Chlo ride (mg.IL)
MW-28 Se lenium (will)
Nitrate+ Nitrite (as N) (mo!/L ) (Class Ill)
TDS(me/L)
Uranium (ug/L)
MW-29 Uranium (ug/L) IC!asslll)
MW-32 Chlo ride (mg/L) rcrass ll n
MW-37 Field pH (S .U.) (Class 111)
Notes:
NS = Not Required and Not Sampled
NA= Not Applicable
GWCLin
March 8,
2021
GWDP
2.5
39.16
237
1309
12 .5
35
0.62
70
58.3 1
2.5
128
53.6
6.47 -8.5
9.82
5
993
2132
15
143
l09.58
7.5
46.8
2
6.43
0.47
so
7507
2.0 1
7.5
2903
4450
5.03-8.5
5.6
0.85
105
II.I
5
3852
4.9
15
35.39
661-8.5
Ql 2021 Results
February February March
QI 2021 QI 2021 2021 2021 2021
Sample Result Monthly Monthly Monthly
Date Sample Result Sample
Dale Date
Requirtd Quarterly Sampling Wells
1.2 1 NA
f----46.4 46.4
f----1/12/21 185 2/9/21 254 3/8/21
f----I 140 1260
f---
<5 NA
1/11/2 1 34 NS NA NS
~ ~::: 1/14/21 ~ 2/10/21 3/9/21 c---
57 .4 71.3
~~: ~
189
1/11/21 ~ 2/10/21 ~ 3/9/21
7A9 ~ 9.16 11.6
17.l ~ 10'10 ~~!: 1/12/21 ~ 2/9/21 3/8/21
-1!!:!_ 22.2
354 ~
Required Semiaooual Sampling Wells
NS NA NS NA NS
NS NA NS NA NS
NS NA NS NA NS
2.75 NA c---8.79 ~ .....f!!!l.L
-1!!:!_ ~
7460 ~
1/14/21 1.14 NS ~ NS
];!! NA ~
~ ~
5.08 NA
5.16
1114/21 -NS NA NS
NA
128 NA -c---
.-!!:L ~ 1/15/21 ~ NS NS
~ ~
10.3 ~
1/15/2 1 16.9 NS NA NS
1/14/21 36.9 NS NA NS
NS NA NS NA NS
Table 1 -GWCL Excteda nce s under tht March 8, 2021 GWDP
Q2 2021 Results
March May2021 June 2021
2021 Q2 2021 Q22021 Monthly May2021 Monthly June 2021 QJ 2021
Monthly Sample Result Sample Monthly Sample Monthly Sample
Result Date Date Rnnlt Date Result Date
Required Quarterly Sampling Wells
NA 0.948 NA NA -46.9 47.7 46.4 52.1
221 04no121 237 5/1 0/21 NA 6/8nl NA 7/27/21
1270 1290 1280 1270
NA <5 NA NA
NA 04/14/21 34 .8 NS NA NS NA 7//8/21
~:~: 1;;; ~ ~::: 04/2 1/21 5/11/21 733 6l8nl 7/28nl
~ 57.5 ~ ~
__!_Y!_ __!12_ ~ __!_Y!_
/92 162 188 170
~ 04/14/21 ~ 5/11 /21 ~ 6/8/21 "si:J 7/29/21
-----1.:.!!_ ___}__Jl2_ ~ ,.......2dL_
10.2 10.3 10.7 9.84
____!_!:!__ ::~~ :::o --1!!:.L.
---1..?..!J!_ _l!.I!L_
2400 04/13121 2300 51 10/21 2610 6/7/21 2400 7/27/21
~ ~ ~ ~
";is ~ ~ ~
Required Semiannual Sampling Wells
NA 4/27/21 74 .0 NS NA NS NA NS
NA 4/20/21 0.599 NS NA NS NA NS
NA 4/26/21 32 .6 NS NA NS NA NS
NA 2.78 NA NA
f----NA ~
NA 8.08 NA
~ rim NA NA
NA 724 NA NA
NA 75#) NA NA
~~ 4/29/21 --1:!!!._ NS NA NS ~~ 7/29/21
3.18 NA
NA ]96{J NA NA
~ ----:iiio NA NA
NA 5.00 NA NA
6.57
NA 4/15/21 -NS NA NS NA 7/22/21
0 ,69
NA 144 NA NA
NA -NA NA 13.4
~ 4/15/21 ~ NS NA NS NA 7/23/21
NA 3740 NA NA
NA 8.52 NA NA
NA 4/14/21 16.2 NS NA NS NA 7/22/2 1
NA 4/13/21 31.8 NS NA NS NA 1nsn,
NA 5/12/2 1 7.00 NS NA NS NA NS
M~rch 8 2021 GWDP. The new GWCt.s-became eJfectl ve on March 8, 2021 and· the first exceedance under the revised GW0P wisnot ed'l ii"th"e Mirch morith lydata .
Q3 2021 Results Q4 2021 Results
August August September September November November Dttember D«ember
QJ 2021 2021 2021 2021 2021 Q4 2021 Q4 2021 2021 2021 2021 2021
Result Monthly Monthly Monthly Monthly Sample Result Monthly Monthly Monthly Monthly Sample Result Sample Date RtsuU Date Sample Date Result Sample Date Result Date
Required Quarterly Sampling Wells Required Quarterly Sampling Wells
0.924 NA NA 1 5 NA NA ,----,___
48.3 57.0 49.6 52.8 53.6 53.9
376 8/I0n l NA 911n, NA ,onon, 286 11 /16/21 261 12/13/21 300
1470 1170 1240 1160 1300 1350
<5 NA NA 6 .75 NA NA
34 .2 NS NA NS NA 10/21/2 1 33.1 NS NA NS NA
0;~;2 ~:: 0.710 0!!8 1.18 1.76
8/10/21 9/9/21 516 10/21/2 1 11 /16/21 568 12115n1 1160
~ ---;;;:;-59.3 ~ 56.9 75.9
~ ~ 15.4 ~ 18.0 18.6
188 161 183 182 /82 184
¼3 8/9/21 ~ 9/8/21 60.4 10119/2 1 ~ 11/17/21 53.6 12/14/21 58.8
~ ~ 6 70 ~ 7.18 7.04
9,60 9 38 9 .74 9 .76 9.67 IO.I
_!_!!_ ~ 16.0 ::;~ 19.3 17.9
___!}_!_!!_ ___!_!_!!!_ 1130 ll80 1220
3100 8/9/21 ~ 9/7/21 2870 10/19/2 1 ~ 11/15/21 2610 12/1 3/21 1420
~ 19.3 10.2 20.9 21.5 21.8
191 ~ 356 371 366 376
Required Semiannual Sampling Wells Required Semiannual Sampling Wells
NA NS NA NS NA 11 110/2 1 75 .5 NS NA NS NA
NA NS NA NS NA 10/26n l 0.446 NS NA NS NA
NA NS NA NS NA 11/8/2 1 33.4 NS NA NS NA
2.71 NA NA 2.66 NA NA --,___
9.26 NA NA 9.30 NA NA
~ NA NA ~ NA NA
~ NA NA ~ NA NA
"riio NA NA 7430 NA NA
_3!_!_ NS ~~ NS NA 11/I0n l ~ NS NA NS NA
----1.:2L_ NA ,_____!2L NA NA
3050 NA NA 3220 NA NA
~ ~ NA 4730 NA NA
5,85 NA NA 5 23 NA NA
6.32 3.88 -NS NA NS NA 10/26n l ,___ NS NA NS NA
NA 0 .65
152 NA NA 147 NA NA -NA NA
,___
NA NA /8.5 11.2
~ NS NA NS NA 10/26/2 1 189 NS NA NS NA ---;;::;:-NA NA 3570 NA NA
~ NA NA 6:i3 NA NA
15.8 NS NA NS NA 10/27/2 1 14 .9 NS NA NS NA
36.5 NS NA NS NA I 1/2/21 36.l NS NA NS NA
NA NS NA NS NA 11/17/21 7.06 NS NA NS NA
T a b le 1 -GW CL Extted a nus und er th e March 8, 2021 G WDP
QI 2022 Results Q2 2022 Results Q3 2022 Results Q4 2022 Results
February February March 2022 March May 2022 June 2022 August August S eptunber September November No vember December December Monitoring GWCLin QI 2022 QI 2022 2022 2022 Monthly 2022 Q2 2022 Q2 2022 Monthly May 2022 Monthly June 2022 Q3 2022 QJ 2022 2022 2022 2022 2022 Q4 2022 Q4 2022 2022 2022 2022 2022 Well(Water Constituent Exceeding GWC L Marth 8, 2021 Sample Result Monthly Monthly Sample Monthly Sample Resull Sample Monthly Sample Monthly Sample Res ult Monthly Monthly Monthly Monthly Sample Result Monthly Monthly Monthly Monthly Class) GWDP Date Sample Result Date Result Date Date Result Date Result Date Sample Result Sample Date Result Date Sample Date Ruult Sa mple Da te Result Date Date
Requi red Quarterly Sampling Wells Required Quarterly Sa mpling Wells Required Quarterly Sampling Well s Required Quarterly Sampling Wells
Nitr ate+ N itrite (as N) (mg/L) 2.5 2!!_ NA NA 22 16 _____!_2_ 2 12 ~ 2.65 __l!!!!_ 1.74 1.30
Chl oride (mg/L) 39.16 51.1 57.1 ~ si:9 ~ 46.4 ~ 67.4 68./ 72.1 71.9 -----;;:;-
MW-Jl Manganese (ug/L) 237 1/18/22 156 2/8/22 ~ 3/8/22 ~ 4/18 /22 ~ 5/4/22 --;;;-6/6/22 ~ 7/12/22 ----in 8/8/22 201 9/21/22 212 10/10/22 ~ 11/8/2 2 220 12/14/22 ~ (Class II ) J02() ~ ~ >--~ ~ 126{) ~ -Sul fate (mg/L) 1309 1240 1270 1300 1140 /330
9.29 ->-->---->---~ ~ -
Se lenium (ug/L) 12.5 NA NA 10 8 NA NA 93 NA NA NA
MW -2S(Class Chloride (mg/L) 35 1n122 34 I NS NA NS NA 4/1 2122 33 4 NS NA NS NA 7/13/22 224 NS NA NS NA 10/10/22 35.8 NS NA NS NA Ill)
MW-26 Nitrate+ Ni trite (as N) (m.lU'L) 0.62 ~ 0367 0600 0.8 I.I ~ ~ --1:J2_ 0 491 0.632 0408 2.66
(Class Ill) Ch lorofonn (u.lU'L) 70 1no122 8/8 2/9/22 --im-3/8/22 ~ 4no122 ~ 5/4/22 ~ 6/7n2 1250 7/14/22 <I 0 8/9/22 1120 9no122 8 /0 10/13/22 ~ 11/10/22 5 12 12/15/22 ~
Chloride (mwl..) 58 .3 1 77T ~ 64.J 56 .8 ~ 474 6U} ~ 62./ 65.5 59.2 60.6
Nitrate+ Ni1rite (as N) (mr/L} 2.5 U.5 13.6 16'6 17 15 JJ.0 1 7.6 13.S /6.5 17.9 15.9 ___!_§:_!__
MW-30 Chloride (mWL) 128 ----iii ~ ~ 173 195 ~ ----ios ~ /82 196 156 ____!!!__
(Cla.ssll) Selenium (u2'1.) 53 .6 J/17/22 ~66~ 2/9/22 ~~~ Jnm ~ 4/20/22 64.9 5/4/22 ~ 617122 ---2i.l_ 7/13/22 ~,j~ 8/9/22 ~ 9no122 70.0 10/13/22 ~ 1 l/9fl2 75.6 12 /13/22 --Ws-Field oH (S .U.) 6.47-8.5 --2:.!!-~ ---2di..-----2:E..._ 7 33 6.81 --ML H7 -~ Uranium (ul?IL) 9 82 JO.I 10.3 9.9 9.6 JO.I 9.6 10.0 10.1 83 9.8 JO.I
Ni trate+ Ni tri te (as N) (mW'L) 5 -1.!!!_ ----11:.!.._ --1.!:!!-__!..!!!_ --1!J!_ ___!!!!_ -1§!!_ ____!_!!_ 1 7.l ~ /6.0 __!lL_
MW-31 Sulfate (mwl) 993 1110 1150 731 /1 80 1120 /1/0 /260 I Z30 1100 972 /380 1180
TDS(m,tL) 2 13 2 1/19/22 262() 2/8/22 ~ 3/7fl2 2m) 4/l 1/22 4300 5/3/22 ~ 6/6/22 ~ 7/12/22 2700 8/8/22 ~ 9nom 2830 10/11/22 ~ 11/8/22 2670 12/13/22 ~ (Cla.ss III ) Uranium (ul!!L) 15 2L7 _EL_ ~ ~ ~ __l_!:_!_ ~ ~ /8.8 ~ U.5 ----12:1._
Chloride (m!!IL) 14 3 370 379 4 /6 372 381 351 421 396 390 397 243 335
R equired Semiannual Sampling Wells Required Semiannual Sa mplin g W ells Required Se mi a nnual Sampling W ells Required Semia nnual Sampling W ells
MW-OJA Se lenium (ug/L) 109 .58 NS NA NS NA NS NA 4n7/22 87 4 NS NA NS NA NS NA NS NA NS NA 10 /19/22 97 5 NS NA NS NA (Class lll )
MW-05(Class Uranium (ug/L) 7.5 NS NA NS NA NS NA 4/18/22 05 NS NA NS NA NS NA NS NA NS NA l0/12/22 0.4 NS NA NS NA 11)
MW-17 Chloride (mg/L) 46 .8 NS NA NS NA NS NA 4/18/22 31 5 NS NA NS NA NS NA NS NA NS NA 10/17/22 54.0 NS NA NS NA fClass ll n
Beryllium (ug/L) 2 2.71 NA NA 2.5 NA NA 2.7 NA NA 3.3 NA NA
Cadmium (ur/L) 6.43 ~ ~ NA 9.2() NA ----,;;;:-~ ------;,;:-NA ~ NA ~
Fluoride (mWL) 0.47 I ~ NA ~ NA ----,;;;:-~ ------;,;:-NA 1.53 NA ~
NickelfmID'L) 50 ::j~ ~ ~ ;iJo ~ ~~ :::o ------;,;:-NA ::j~ NA ~
MW-24 Mane.anese (u2/L) 7507 ~: NA NA 7/20/22 :~ NA NA NA
(Class Ill ) Tha lliu m (u2/L) 2 0 1 ln?/22 ~ NS NS NA 4/27/22 ,......±!_ NS ~ NS 7128/22 ---1:!!-NS NS NA 11/2/22 --12..--NS NA NS ~
Gross Alpha CnCi/L) 75 2.26 NA NA 2.28 NA ----,;;;:-2.55 ------;,;:-NA 2.70 NA ~
Sulfate (mW L) 2903 306() ~ NA ~~!~ NA ----,;;;:----isoo-------;,;:-NA 2680 NA ~
TDS (m l!/L) 44 50 ~ ~ ~ ~ ~ ~ ~ NA ~ NA NA -
Fiel d pH (SU) 5.03-8.5 5 31 NA NA 4.81 NA NA 4.89 NA NA 4.39 NA NA 4.80
IVIVY•ll Nitrate+ Nitri te (as N) (mg/L) 5.6 6.15 6.30 5.18 5.26
(Class III) 1/18/22 NS NA NS NA 4/12/22 ~ NS NA NS NA 7/15/22 ~ NS NA NS NA 10/19122 -NS NA NS NA
Fluoride (mg/L) 0 85 NA 0.90 0.530 0722
Chloride (mg/L) 105 140 NA NA 130 NA NA 159 NA NA 161 NA NA
MW-28 Selenium (up/l,) 11.l ----i:u-~ NA 19.8 NA ----,;;;:-~ ------;,;:-NA 2i:? NA NA
(Class Ill ) Nitra te+ Nitri te (as N) {m11/L) 5 1/20/22 4.03 NS ~ NS NA 4/19122 s:i-NS NA NS ----,;;;:-7/15/22 s:u;-NS ----;:;;,-NS NA 10/12/22 ~ NS NA NS ~
TDS (me/L) 3852 ~ ~ ~ ~ ~ ~ ~ ~ NA 3550 NA ~
Uranium (ue/L) 4.9 8.50 NA NA JO.JO NA NA 11.4 NA NA 11.5 NA NA
MW-29 Uranium (ug/L) 15 1/1 8/22 15./ NS NA NS NA 4/14/22 15.7 NS NA NS NA 7/14/22 15.l NS NA NS NA 10/12/22 15.2 NS NA NS NA !Class Ill)
MW -3 2 Ch loride (mg/L) 35 39 1/19/2 2 35 0 NS NA NS NA 4/11 /22 28 .6 NS NA NS NA 7115122 28 2 NS NA NS NA 10/11/22 37.1 NS NA NS NA (Class III)
MW -37 Field pH (SU) 661-8.5 NS NA NS NA NS NA 5/17/22 704 NS NA NS NA NS NA NS NA NS NA 11 /ln2 6.60 NS NA NS NA (Class Ill)
QI 2023 Rrnlts
Febr■ary Febr■ary Mar<h Marclll Monitoring GWCLi• QI 2023 2023 2023 Q22023 QI 2023 2023 2023 Wcll(Water Constituent E.ceeding GWCL M■rc:h 8, Samplt Result Monthly Monthly Monthly Monthly Sample
Class) 2021 GWDP Date Sample Sample Date
Date Res ult Date Result
Required Quarterly Sampling Well5
Nitrate+ Ni trite (as N) (mg/L) 25 3.49 2.89 Z.53
I-r--
Chloride (mg/L} 39 16 70.7 71.4 66.3
MW-II 1ns123 2/8/23 3/14/23 4/17/23 (Class ii) Manganese (ug/L) 237 193 161 211
Sulfate(mg/L) 1309 1240 1100 1430
Se lenium (ug/L} 12.5 17.5 17.7 U.9
MW-25(Class Chloride (mgfL) 35 1/23/23 32.4 2/7/23 321 3/15/23 326 4/19/23 Ill )
MW-26 Nitrate+ Nitrite (as N) (me.IL) 0.62 ~;: ::: ~·::: (C lass Ill ) Chloroform (u!Zl'L) 70 In6/23 218/23 3/14/23 4n7/2l
Chloride (m2/L) 58 .31 5Ll 521 47 .7
Nitrate+ Nitrite (as N) (mli?l'L) 2.5 _!..!!_ ----1£!_ --1.!d...-
MW-30 Chloride (me:/IJ 128 166 173 199
(Class II) Selcn ium(mz/l) 53.6 l/25nJ 68.8 218/23 ~ 3/15/23 -w-4n6/23
Field oH (S .U) 6.47 -8.5 ~ ~ ~ Uranium (u'1L) 9.82 10.8 9.6 9.6
Ni trate+ Nit rite (as N) (m!V L) 5 ::~; ili ~
MW-3 1 Su lfa te (mall) 993 :s;~
(Class III ) T DS (mw!,) 2 132 1/24/23 2740 217/23 3/14 /23 4/24/23
Urani um (ug/L) 15 ~ ~ ~
Chlor ide (mWL) 143 --;;;-~ ----;oi-
Required Semiannual Sampling Wells
MW-OJA Selenium (ug/L) 109.58 NS NA NS NA NS NA 4n1123 (C lass Ill)
MW-05(Class Uranium (ug/L) 75 NS NA NS NA NS NA 4/19/23 II)
MW-17 Chloride (mg/L) 46 8 1/30/23 26 .5 NS NA NS NA 4/25/23 (Class 11\l
Beryllium (ug/L) 2 2.4 NA NA
f---~ -Cadmium (ull/L) 6.43 J!_ :~ Fluoride (mwl) 047 0.699 ~
Nickel (mg/L) 50 725 ~ ~
MW-24 Mane:anese (u!!:/L) 7507 7000 ~ ~
(Class Ill ) Thall ium (ue./L) 2.0 1 1131/23 ~ NS ~: NS ~~ 5/2123
Gross Aloha (oCi/L) 7.5 -ld2..._
Sulfat e (m.e/L) 2903 2720 NA NA
TDS (m•/1) 445 0 ~ ~ ~
Field pH (S U) 5.03-8.5 4.76 NA NA
MV•i-27 Nitrate+ Nitrite (as N) (mg/L) 5.6 5.25
(Class Ill ) ln7/2l f---NS NA NS NA 4/18/23
Fluo r ide (mg/L) 0 .85 068;
Chloride (mg/L) 105 uo NA NA
f---~ ~ MW-28 Selenium (ull/L) I I.I <50
(Class Ill) Nitrate+ Nitrite (as N) (ml?/L) 5 ln7/2l ~ NS NA NS NA 4/18/23
TDS (me/L) 3852 NA ~ ~
Uranium (uwl,) 49 JU ~ ~
MW-29 Uraniu m (ug/L) 15 1/27/23 9.7 NS NA NS NA 4/19/23 (Class Ill)
MW-32 C hl oride (mg/L) 35.39 1130/23 279 NS NA NS NA 4/25/23 <Class llll
MW-37 Fie ld pH (S U.) 6.61 -8.5 219/23 6.55 NS NA NS NA 5/l ln3 (Class Ill )
T a bl e 1 -GW CL Excee d a nces unde r lh ~ March 8, 202 1 G WD P
Q2 2023 ReHlts Q3 2023 Results
May 2023 Juac2023 May 2023 J.at2023 Q3 2023 Aua:ust2023 August2023 September
Q2 2023 Monthly Monthly Q3 2023 Monthly 2023
Result Sample Monthly Sample Monthly Sample Result Sample Monthly Monthly Result Result Date Result Dok Date Date Sample Date
Required Quarterly Sampling Wells Required Quarterly Sampling Wells
2.98 Z.64 2.86 3.22 4.30 c----f---~ 70.6 66.0 69.0 77.J
519/23 -6/5/23 -f---I-
224 233 283 7/1 1/23 238 8n/23 149 9/5/23 --f---I-
1330 1230 1340 /370 1190 -f---I-
U.2 16.8 15.3 17.l 22.0
35.8 5/10/23 34 9 6/6/23 35.2 711 1/23 36.7 8/1/23 33 7 9/6/23
06~;1 ~ __!.!!!!_ 0.716 ~ 5/10/23 __lE__ 6/6/23 ___EL 7113/23 ~ 8n/23 ~ 9/6/23
64.4 64.4 60.0 68.0 52.5
___..!i:2_ ~~: ~~; ~~: ~ 202 ~ ~ 5/10/23 70.9 6/6/23 ~ 7/11 /23 ~ 8nm --lJ!L_ 9/5/23
~ ~ ~ 689 7 16
9.5 10.5 ~ ~ ~
ii;~ ~ --1..§:!_ JM 17.5
~;;: !!~: 1190 ------im-
519123 6/5/23 7/10/23 ....EEL 811/23 ~ 9/6/23
2iJJ 25.2 ~ ~ ~ 297 ~ 397 429 404
Required Semi ■anual Sampling WeJb Req ■ired Semi ■oaual Sampling Well s
112.0 NS NA NS NA 1112n3 171 NS NA NS
26.3 NS NA NS NA 7/13/23 5.5 NS NA NS
279 NS NA NS NA 7/13/23 33 1 NS NA NS
2.6 NA ~ u NA ->---9A ~
/5;7 ~ ~ NA 0.544 :: 7V ~ ~ -1!!:J__ 703() ~ NA 7300 NA
---1:..!._ NS ~ NS ~ 7/12/23 ~ NS ~ NS
---1..!2._ ~~ ~ __MQ_ ~
2720 NA ~~~~ ~: ~ ~ ~
4.94 NA NA 4.96 NA
5 32 5 24 -NS NA NS NA 71 13/23 -NS NA NS
0613 0 56 1
155 NA NA 150 NA -I->----~ _EL :~ ~ -11:J_
_.!E._ NS NS ~ 7/13/23 :a:~ NS ~: NS
3870 NA NA
/l8 ~ ~ 11.2 NA
15.3 NS NA NS NA 7/12123 14 I NS NA NS
36.J NS NA NS NA 7110/23 38.4 NS NA NS
6.94 NS NA NS NA 7/17/23 702 NS NA NS
September
2023
Monthly
Result
4./0
80.3
233
1330
21.I
331
1.530
475
55 5
17.1
186
73.0
6.93
ll.4
16.8
IZZO
2940
27.l
417
NA
NA
NA
NA
NA
NA
NA
NA
NA
NA
NA
NA
NA
NA
NA
NA
NA
NA
NA
NA
NA
NA
Q4 2023 Resu lts
Octobcr2023 October Q42023 December December
2023 Q4 2023 2023 2023 Monthly Monthly Sample Result Monthly Mo nthly Sample Date Date Result Sample Date Rnult
Required Quarterly Sampling Wells
3.74 3.96 3.28
7l3 aiu 75.0
~ f---
1013n3 11/1/23 2 17 12/13/23 336 -f---
1290 1270 1550 -f---
10.9 20.I 19.5
10/4/23 33 .5 1117/23 35.7 121 14/23 36.7
0.327 1.87 0 319
10/4/23 ~ 11nn3 Im 12/ll/23 425
45 .3 71.5 60.4
~ ~ 17.4
~ ~ 204
1014/23 --1l}_ 11/1/23 -1!!L 12/14/23 79.5
~ ~ 7.16
10.5 10.1 10.5
17.0 18.0 17.2
~ 1350 1340
l0/3/23 ~ 11 16123 1580 12/13/23 2820
~ !~: 26.6
396 408
Required Semiannual Sampling Wells
NS NA 10/19/23 132 NS NA
NS NA 10 /19/23 25 NS NA
NS NA l0/23/23 33.4 NS NA
NA 2.3 NA
~ ~ ~
~ D.502 ~ ~: ;~~ ~:
NS NA 10/26/23 3.0 NS NA
~ ~ ~ :~ !~~~ ~ ~
NA 4.50 NA
5.49
NS NA 11 /7/23 -NS NA
0607
NA 14/ NA
~ ~ ~
NS ~ 10/18/23 ;;!~ NS ~~ ~ NA 8.2
NS NA 10/1 8/23 15.I NS NA
NS NA 11/6/23 36.8 NS NA
NS NA 11/16/23 6.82 NS NA
Pur s ua nt to t he DWMRC letter of Novembe r 6, 20 23, t hese co nstituents will
no long e r be re ported o n an ac celerated sch edule. The se co nstituen ts will be
d ropped from thi s report after thi s qu arter.