DRC-2023-003902 - 0901a068811e6a1f

April 25 , 2023
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 .energyfuels.com
:Jiv f W ~
. d ~ I ' . '
"'~ lt
..., t ol
APR 2 8 20?3
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 first quarter ("QI ") groundwater monitoring during the period
from January 1, to March 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 March 27, 2023 .
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 of review, 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 I.G.1 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 I.G.1 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, 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 :
DRC-2023-003902
Letter to Mr. Doug Hansen
April 25, 2023
Page2
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, EFRJ 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. EFRJ 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.
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 Ql 2023. A 30-day plan and schedule contemplated in Part I.G.1 c) of
the GWDP will be required 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.
Letter to Mr. Doug Hansen
April 25, 2023
Page 3
MW-11
• The chloride concentration exceeded its GWCL in all of the QI 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 QI 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 QI 2023 sampling events. This is the
first consecutive exceedance for selenium in MW-11. Therefore, a plan and schedule for
assessment will be submitted under separate cover within 30 days of this Exceedance Notice.
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 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 QI 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 nitrate concentration exceeded its GWCL in all of the QI 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.
MW-30
• Nitrate + nitrite has exceeded its GWCL in all of the QI 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 QI 2023 sampling events. As
mentioned above, a CAP has been submitted and approved to address nitrate+nitrite contamination
Letter to Mr. Doug Hansen
April 25, 2023
Page4
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 Ql 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 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.
• Uranium has exceeded the GWCL in the December 2022 and Ql 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 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-31
• Nitrate + nitrite has exceeded its GWCL in all of the Ql 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 the Ql and February 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 Ql 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 Ql 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.
Letter to Mr. Doug Hansen
April 25, 2023
Page 5
• Uranium concentrations exceeded the GWCL in all of the Ql 2023 sampling events. A SAR was
submitted to DWMRC on April 29, 2021. 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.
1.2 Quarterly Wells with New Exceedances Reported in Ql
There are no new exceedances for the Q 1 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 (Q4 2022 and Ql 2023).
MW-24
Beryllium, cadmium, fluoride, nickel, thallium, and field pH exceeded their GWCLs in MW-24 in the Q4
2022 and Ql 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. EFRl 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 ofDWMRC'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.
Letter to Mr. Doug Hansen
April 25, 2023
Page 6
MW-28
• Chloride has exceeded the GWCL for both the Q4 2022 and Ql 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.
• Uranium has exceeded the GWCL for both the Q4 2022 and Ql 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-37
• The field pH measurement was slightly below its GWCL for both the Q4 2022 and Ql 2023
sampling events. This is the first consecutive exceedance for field pH in MW-37. Therefore, a
plan and schedule for assessment will be submitted under separate cover within 30 days of this
Exceedance Notice.
2.2 Semi-annual Wells with New Exceedances Reported in Ql
There are no new exceedances for the Ql 2023 semi-annual well sampling program.
Yours truly,
i( a1-t/jf µ,,,..J
ENERGY FUELS RESOURCES (USA) INC.
Kathy Weinel
Director, Regulatory Compliance
cc: Scott Bakken, David Frydenlund, Logan Shumway, Garrin Palmer, Jordan App
Monitoring
Well (Water Constituent Exceeding GWCL
Class)
Nitrate + Nitrite (as N) (mg/L)
Chloride (mg/L)
MW-11 Manganese ( ug/L)
(Class II) Sulfate (mg/L)
TDS (mg/L)
Selenium (ug/L)
MW-25 (Class TDS (mg/L)
III ) Chloride (mg/L)
MW-26 Nitrate + Nitrite (as N) (mg/L)
Chloroform ( ug/L) (Class III) Chloride (mg/L)
Nitrate + Nitrite (as N) (mg/L)
MW-30 Chloride (mg/L)
Selenium (ug/L) (Class II) Field pH (S U )
Uranium (ug/L)
Nitrate + Nitrite (as N) (mg/L)
MW-31 Sulfate (mg/L)
(Class Ill) TDS (mg/L)
Uranium (ug/L)
Chloride (mg/L)
MW-12 Uranium (ug/L)
(Class III) Selenium (ug/L)
MW-17 Chloride (mg/L) /Class Ill)
Beryllium (ug/L)
Cadmium (ug/L)
Fluoride (mg/L)
Nickel (mg/L)
MW-24 Manganese (ug/L)
(Class III) Thallium (ug/L)
Gross Aloha /oCi/L)
Sulfate (mg/L)
TDS (mg/L)
Field pH (S U.)
MW-27 Nitrate + Nitrite (as N) (mg/L)
(Class Ill)
Fluoride (mg/L)
Chloride (mg/L)
MW-28 Selenium (ug/L)
(Class 111) Nitrate + Nitrite (as N) (mg/L)
Uranium (ug/L)
MW-29 Uranium (ug/L) /Class III)
MW-32 Chloride (mg/L) /Class Ill)
MW-37 Field pH (S.U.) (Class III)
Notes:
NS= Not Required and Not Sampled
NA= Not Applicable
Exceedances are shown in yellow
GWCLin QI 2021 March 8, Sample 2021
GWDP Date
2.5
39. 16
237 1/12/21 1309
2528
12.5
2976 1/11 /21
35
0.62
70 1/14/21
58.31
2.5
128
53.6 1/11 /21
6.47 -8.5
9.82
5
993
2132 1/12/21
15
143
23.5
39 1/14/21
46.8 NS
2
6.43
0.47
50
7507
2 01 1/14/21
7.5
2903
4450
5.03 -8.5
5.6 1/14/21
0.85
105
II I 1/15/21
5
4.9
15 1/15/21
35.39 1/14/21
6.6 1 -8.5 NS
Ql 2021 Results
February February March March 2021 2021 QI 2021 Monthly 2021 Monthly 2021
Result Monthly Monthly Sample Result Sample Result Date Date
Required Quarterly Sampling Wells
1.21 NA NA
46.4 46.4 46.9
185 2/9/21 254 3/8/21 221
1140 1260 1270
2010 2160 1950
<5 NA NA
2660 NS NA NS NA
34 NA NA
0.6 19 0.764 0.617
2200 2/10/21 1930 3/9/21 2190
57.4 71.3 63.9
17.7 /4.3 17.0
184 /89 /92
55.6 2/10/21 55.3 3/9/21 56.3
7.49 7.25 7.14
9.86 11.6 /0.2
17. I 14.3 17.4
1070 1130 1210
2460 2/9/21 2960 3/8/21 2400
19. 7 22.2 20.2
354 380 388
Required Semiannual Sampling Wells
25.0
35.1 NS NA NS NA
NA NS NA NS NA
2.75 NA NA
8.79 NA NA
0.916 NA NA
70.4 NA NA
7460 NA NA
2.74 NS NA NS NA
2.94 NA NA
2980 NA NA
4260 NA NA
5.08 NA NA
5.16 NS NA NS NA NA
/28 NA NA
14.0 NS NA NS NA
3.44 NA NA
10.3 NA NA
/6.9 NS NA NS NA
36.9 NS NA NS NA
NA NS NA NS NA
These GWCLs were reset with the issuance of the March 8, 2021 GWDP. The new GWCLs became effective on March 8, 2021 and the first
exceedance under the revised GWDP was noted in the March monthly data.
Q2 2021
Sample
Date
04/20/21
04/14/21
04/21/21
04/14/21
04/13/21
4/20/21
4/26/21
4/29/21
4/15/21
4/15/21
4/14/21
4/13/21
5/12/21
Table 1 -GWCL Exceedances under the March 8, 2021 GWDP
Q2 2021 Results QJ 202.l Results Q4 2021 Results
May 2021 June 2021 August August September September November November December December May 2021 June 2021 QJ 2021 2021 Q4 2021 Q2 2021 Monthly Monthly Monthly Monthly Sample QJ 2021 Monthly 2021 2021 2021 Sample Q4 2021 2021 2021 2021 2021
Result Sample Sample Result Monthly Monthly Monthly Result Monthly Monthly Monthly Monthly
Date Result Date Result Date Sample Result Sample Date Result Date Sample Date Result Sample Date Result Date
Required Quarterly Sampling Wells Required Quarterly Sampling Wells Required Quarterly Sampling Wells
0.948 NA NA 0.924 NA NA 1.5 NA NA
47. 7 46.4 52.1 48.3 57.0 49.6 52.8 53.6 53.9
237 5/10/21 NA 6/8/21 NA 7/27/21 376 8/10/21 NA 9/7/21 NA 10/20/21 286 11/16/21 261 12/13/21 300
1290 1280 1270 1470 1370 1240 1360 1300 1350
2110 2190 1960 2680 NA NA 2200 2230 2140
<5 NA NA <5 NA NA 6.75 NA NA
2720 NS NA NS NA 7/28/2 I 3100 NS NA NS NA I 0/20/21 2680 11/16/2 I 2920 12/14/2 1 2590
34.8 NA NA 34.2 NA NA 33.1 NA NA
1.42 1.06 0.368 0.352 1.42 0.710 0.928 1.18 1.76
777 5/11 /21 733 6/8/21 1590 7/28/2 1 723 8/10/21 996 9/9/21 516 10/21 /21 540 11/16/21 568 12/15/21 1160
57.5 69.6 54.9 54.0 61.4 59.3 55.2 56.9 75.9
17. 7 18.6 17.0 20.6 /6.5 15.4 /4.3 /8.0 /8.6
/62 188 170 /88 /6/ /83 /82 /82 /84
55.7 5/1 1/21 58.3 6/8/21 54./ 7/29/21 56.3 8/9/21 56./ 9/8/21 60.4 I 0/19/21 54.6 11/17/21 53.6 12/14/2 1 58.8
720 720 7.36 6.98 6.84 6.70 6.77 7.18 7 04
/0.3 JO. 7 9.84 9.60 9.38 9.74 9.76 9.67 JO. I
18.6 18.9 20.6 18.7 /5. 7 16.0 18./ /9.3 17.9
1170 1200 1170 1210 1130 1130 1220 1180 1220
2300 5/10/21 2610 6/7/21 2400 7/27/21 3100 8/9/21 2600 9/7/21 2870 I 0/19/21 2600 11/15/21 26/0 12/13/2 1 2420
20./ 2/. 7 20.8 20.0 /9.3 20.2 20.9 21.5 21.8
377 384 374 39/ 365 356 371 366 376
Required Semiannual Sampling Wells Required Semiannual Sampling Wells Required Semiannual Sampling Wells
22.9
28.8 NS NA NS NA 7/21/21 22.2
32.4 NS NA NS NA 11/9/21 23.1
26.4 NS NA NS NA
32.6 NS NA NS NA NS NA NS NA NS NA 11/8/21 33.4 NS NA NS NA
2.78 NA NA 2. 71 NA NA 2.66 NA NA
8.08 NA NA 9.26 NA NA 9.30 NA NA
0.925 NA NA 1.4 NA NA 0.988 NA NA
72.4 NA NA 76. 7 NA NA 76. 7 NA NA
7540 NA NA 7890 NA NA 7430 NA NA
3.02 NS NA NS NA 7/29/21 2.91 NS NA NS NA 11/10/21 3.14 NS NA NS NA
3.18 NA NA 1.92 NA NA 1.56 NA NA
2960 NA NA 3050 NA NA 3220 NA NA
4460 NA NA 4940 NA NA 4730 NA NA
5.00 NA NA 5.85 NA NA 5.23 NA NA
6.57 6.32 3.88 NS NA NS NA 7/22/21 NS NA NS NA 10/26/21 NS NA NS NA
0.69 NA 0.65
144 NA NA 152 NA NA 147 NA NA
13.4 NS NA NS NA 7/23/21 18.5 NS NA NS NA 10/26/21 11.2 NS NA NS NA
4 09 NA NA 6.09 NA NA 1.89 NA NA
8.52 NA NA 13.80 NA NA 6.03 NA NA
16.2 NS NA NS NA 7/22/21 15.8 NS NA NS NA 10/27/2 I 14.9 NS NA NS NA
31.8 NS NA NS NA 7/28/21 36.5 NS NA NS NA 11/2/21 36.I NS NA NS NA
7.00 NS NA NS NA NS NA NS NA NS NA 11/17/21 706 NS NA NS NA
Monitoring
Well (Water
Class)
MW-II
(Class 11)
MW-25 (Class
111)
MW-26
(Class Ill)
MW-30
(Class II)
MW-31
(Class Ill)
MW-12
(Class Ill)
MW-17
(Class 111)
MW-24
(Class Ill)
MW-27
(Class 111)
MW-28
(Class 111)
MW-29
(Class Ill)
MW-32
(Class Ill)
MW-37
/Class Ill)
QI 2022 Results
February February March 2022 March GWCL in QI 2022 2022
Constituent Exceeding GWCL March 8, 2021 Sample QI 2022 Monthly 2022 Monthly 2022
GWDP Date Result Sample Monthly Sample Monthly
Date Result Date Result
Required Quarterly Sampling Wells
Nitrate+ Nitrite (as N) (mg/L) 2.5 2.55 NA NA
Chloride (mg/L) 39.16 5/. I 57.2 67. 7
Manganese (ug/L) 237 1/18/22 156 2/8/22 233 3/8/22 224
Sulfate (mg/L) 1309 1020 1240 1170
TDS (mg/L) 2528 2050 1900 2080
Selenium (ug/L) 12.5 9.29 NA NA
TDS (mg/L) 2976 1/17/22 2720 2/9/22 2690 3/7/22 2610
Chloride (mg/L) 35 34.1 NA NA
Nitrate + Nitrite (as N) (mg/L) 0.62 0.601 0.367 0.600
Chloroform (ug/L) 70 1/20/22 8/8 2/9/22 /580 3/8/22 /460
Chloride (mg/L) 5831 77.I 58.6 64.I
Nitrate + Nitrite (as N) (mg/L) 2.5 14.5 13.6 /6.6
Chloride (mg/L) 128 181 184 196
Selenium (ug/L) 53.6 1/17/22 56.7 2/9/22 57. 7 3/7/22 62.0
Field pH (S U ) 6.47 -8.5 7.62 720 7.12
Uranium (ug/L) 9.82 JO. I 10.3 9.9
Nitrate + Nitrite (as N) (mg/L) 5 /8.0 /3.5 17.0
Sulfate (mg/L) 993 1210 1250 731
TDS (mg/L) 2132 1/19/22 2620 2/8/22 2680 3/7/22 2530
Uranium (ug/L) 15 21.7 22./ 22.5
Chloride (mg/L) 143 370 379 416
Required Semiannual Sampling Wells
Uranium (ug/L) 23.5 1/20/22 Selenium (ug/L) 39
22.1
25.6 NS NA NS NA
Chloride (mg/L) 46.8 NS NA NS NA NS NA
Beryllium (ug/L) 2 2. 71 NA NA
Cadmium (ug/L) 6.43 8.46 NA NA
Fluoride (mg/L) 0.47 I NA NA
Nickel (mg/L) 50 80.9 NA NA
Manganese (ug/L) 7507 7630 NA NA
Thallium (ug/L) 201 1/27/22 2.66 NS NA NS NA
Gross Alpha (pCi/L) 7.5 2.26 NA NA
Sulfate (mg/L) 2903 3060 NA NA
TDS (mg/L) 4450 4140 NA NA
Field pH (S U ) 5.03 -8.5 5.31 NA NA
Nitrate + Nitrite (as N) (mg/L) 5.6 6.25 1/18/22 NS NA NS NA
Fluoride (mg/L) 0.85 NA
Chloride (mg/L) 105 /40 NA NA
Selenium (ug/L) 11.1 1/20/22 /3.3 NS NA NS NA
Nitrate+ Nitrite (as N) (mg/L) 5 4 03 NA NA
Uranium (ug/L) 4.9 8.50 NA NA
Uranium (ug/L) 15 1/18/22 15./ NS NA NS NA
Chloride (mg/L) 35.39 1/19/22 35.0 NS NA NS NA
Field pH (S.U.) 6.61 -8.5 NS NA NS NA NS NA
Pursuant to ttie DWMRC letter of August 8, 2022, these constituents will no longer be monitored on an accelerated schedule.
Th ese constituents will be dropped from this report after this quarter.
Q2 2022
Sample
Date
4/18/22
4/12/22
4/20/22
4/20/22
4/11/22
4/19/22
4/18/22
4/27/22
4/12/22
4/19/22
4/14/22
4/11/22
5/17/22
Table I -GWCL Exceedances under the March 8, 2021 GWDP
Q2 2022 Results QJ 2022 Results Q4 2022 Results
May 2022 June 2022 August August September September November November December December May 2022 June 2022 QJ 2022 2022 Q4 2022 Q2 2022 Monthly Monthly Monthly Monthly Sample QJ 2022 Monthly 2022 2022 2022 Sample Q4 2022 2022 2022 2022 2022
Result Sample Result Sample Result Date Result Sample Monthly Monthly Monthly Date Result Monthly Monthly Monthly Monthly
Date Date Date Result Sample Date Result Sample Date Result Sample Date Result
Required Quarterly Sampling Wells Required Quarterly Sampling Wells Required Quarterly Sampling Wells
2.2 1.6 1.9 2.12 2.45 2.65 2.90 2.74 1.30
54.9 59.5 46.4 54.0 67.4 68. I 72./ 71.9 52.3
180 5/4/22 254 6/6/22 228 7/12/22 297 8/8/22 201 9/21/22 212 10/10/22 214 11/8/22 220 12/14/22 273
1240 1270 866 /390 1260 1300 1140 1140 1330
2060 2290 2360 2520 3230 2280 2570 2270 2370
10.8 NA NA 9.3 NA NA 15.5 NA NA
3600 5/3/22 2660 6/7/22 2730 7/13/22 2830 8/9/22 2780 9/20/22 2750 10/10/22 2660 11/9/22 2690 12/14/22 2780
33.4 NA NA 22.4 NA NA 35.8 NA NA
0.8 I. I 0.60 1.63 1.56 0.491 0.632 0.408 2.66
447 5/4/22 616 6/7/22 1250 7/14/22 <1.0 8/9/22 1120 9/20/22 810 10/13/22 749 11/10/22 512 12/15/22 460
56.8 63.2 47.4 6/.0 65.0 62. J 65.5 59.2 60.6
17 15 11.0 17.6 13.5 /6.5 17.9 15.9 /6. I
173 /95 126 108 185 /82 /96 156 /95
64.9 5/4/22 69.4 6/7/22 65.7 7/13/22 61. I 8/9/22 64.3 9/20/22 70.0 10/13/22 65./ 11/9/22 75.6 12/13/22 70.8
6.92 7.24 7.32 7.33 7.33 6.81 6.84 6.37 6.59
9.6 /0. J 9.6 10.0 10. I 8.3 9.8 10. I /3.0
/8.0 /3.0 13.0 16.9 16.8 17. I 17.0 16.0 /2.6
1180 1220 1110 1260 /230 1200 972 /380 1280
4300 5/3/22 2660 6/6/22 2690 7/12/22 2700 8/8/22 2700 9/20/22 2830 10/11/22 2720 11/8/22 2670 12/13/22 2700
22.0 22.9 21.5 22.6 22.7 18.8 23.3 24.5 26.2
372 38/ 35/ 42/ 396 390 397 243 335
Required Semiannual Sampling Wells Required Semiannual Sampling Wells Required Semiannual Sampling Wells
20.5
31.3 NS NA NS NA 7/14/22 21.6 NS 29.2 NA NS NA 10/13/22 21.2
32.1 NS NA NS NA
31.5 NS NA NS NA NS NA NS NA NS NA 10/17/22 54.0 NS NA NS NA
2.5 NA NA 2.7 NA NA 3.3 NA NA
9.20 NA NA 8.6 NA NA 10.9 NA NA
0.8 NA NA 0.760 NA NA 1.53 NA NA
74.3 NA NA 69.9 NA NA 86.9 NA NA
7070 NA NA 7/20/22 7540 NA NA 8130 NA NA
3./ NS NA NS NA 7/28/22 3.0 NS NA NS NA 11/2/22 3.5 NS NA NS NA
2.28 NA NA 2.55 NA NA 2.70 NA NA
3/20 NA NA 2800 NA NA 2680 NA NA
3350 NA NA 4200 NA NA 4440 NA NA
4.81 NA NA 4.89 NA NA 4.39 NA NA 4.80
6.30 5.18 5.26 NS NA NS NA 7/15/22 NS NA NS NA 10/19/22 NS NA NS NA
0.90 0.530 0.722
130 NA NA 159 NA NA /6/ NA NA
/9.8 NS NA NS NA 7/15/22 20.8 NS NA NS NA 10/12/22 23.7 NS NA NS NA
5./ NA NA 5./6 NA NA 5.69 NA NA
10./0 NA NA /2.4 NA NA /2.5 NA NA
15. 7 NS NA NS NA 7/14/22 /5. I NS NA NS NA 10/12/22 /5.2 NS NA NS NA
28.6 NS NA NS NA 7/15/22 28.2 NS NA NS NA 10/11/22 37.I NS NA NS NA
704 NS NA NS NA NS NA NS NA NS NA 11/1 /22 6.60 NS NA NS NA
.\.
Table I -GWCL Exceedances under the March 8, 2021 GWDP
Ql 2023 Results
February February March 2023 March Monitoring GWCLin Qt 2023 2023
Well (Water Constituent Exceeding GWCL March 8, 2021 Sample QI 2023 Monthly 2023 Monthly 2023
Class) GWDP Date Result Sample Monthly Sample Monthly
Date Result Date Result
Required Quarterly Sampling Wells
Nitrate + Nitrite (as N) (mg/L) 2.5 3.49 2.89 2.53
Chloride (mg/L) 39.16 70. 7 71.4 66.3
MW-II Manganese ( ug/L) 237 193 161 211
(Class 11) 1/25/23 2/8/23 3/14/23
Sul fate (mg/L) 1309 1240 1100 1430
TDS (mg/L) 2528 2390 2120 2300
Selenium (ug/L) 12.5 17.5 17.7 14.9
MW-25 (Class TDS (mg/L) 2976 2750 2610 2600
111) 1/23/23 2/7/23 3/15/23
Chloride (mg/L) 35 32.4 32.2 32.6
MW-26 Nitrate + Nitrite (as N) (mg/L) 0.62 1.82 1.94 0.875
(Class 111) Chloroform (ug/L) 70 1/26/23 709 2/8/23 664 3/14/23 1060
Chloride (mg/L) 58.3 1 51.5 52.2 47.7
Nitrate + Nitrite (as N) (mg/L) 2.5 18. I 15.9 17.3
MW-30 Chloride (mg/L) 128 166 173 199
(Class 11) Selenium (ug/L) 53.6 1/25/23 68.8 2/8/23 70.6 3/15/23 72./
Field pH (S.U.) 6.47 -8.5 7 0 1 6.77 7.15
Uranium (ug/L) 9.82 10.8 9.6 9.6
Nitrate + Nitrite (as N) (mg/L) 5 18. 7 16.5 17.9
MW-31 Sulfate (mg/L) 993 1230 1/90 951
(Class 111) TDS (mg/L) 2132 1/24/23 2740 2/7/23 2730 3/14/23 2520
Uranium (ug/L) 15 25.4 23.3 23.7
Chloride (mg/L) 143 333 388 302
Required Semiannual Sampling Wells
MW-12 Uranium (ug/L) 23.5 21.3 1/26/23 NS NA NS NA (Class 111) Selenium (ug/L) 39 270
MW-17 Chloride (mg/L) 46.8 1/30/23 (Class III) 26.5 NS NA NS NA
Beryllium (ug/L) 2 2.4 NA NA
Cadmium (ug/L) 6.43 9.2 NA NA
Fluoride (mg/L) 0.47 0.699 NA NA
Nickel (mg/L) 50 72.5 NA NA
MW-24 Manganese (ug/L) 7507 7000 NA NA
(Class 111) Thallium (ug/L) 201 1/31 /23 2.9 NS NA NS NA
Gross Aloha (oCi/L) 7.5 2.27 NA NA
Sulfate (mg/L) 2903 2720 NA NA
TDS (mg/L) 4450 4220 NA NA
Field pH (S.U) 5.03 -8.5 4.76 NA NA
MW-27 Nitrate + Nitrite (as N) (mg/L) 5.6 5.25
(Class III) 1/27/23 NS NA NS NA
Fluoride (mg/L) 0.85 0.685
Chloride (mg/L) 105 140 NA NA
MW-28 Selenium ( ug/L) 11.1 1/27/23 <5.0 NS NA NS NA
(Class 111) Nitrate + Nitrite (as N) (mg/L) 5 4.57 NA NA
Uranium (ug/L) 4.9 15.5 NA NA
MW-29 Uranium (ug/L) 15 1/27/23 9.7 NS NA NS NA (Class 111)
MW-32 Chloride ( mg/L) 35.39 1/30/23 27.9 NS NS (Class Ill) NA NA
MW-37 Field pH (S U ) 6.6 1 -8.5 2/9/23 (Class 111) 6.55 NS NA NS NA