DRC-2023-001199 - 0901a0688117dd61

etNERGYFUELS
February 1, 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
Energ� Fuels Resources ( l'SA) Inc.
225 Union Bh d. Suite 600Lakewood, CO. US, 80228 303 97-l 21-l0 \� \\ v. .cncrl'.\ fucl�.cum
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, 2022 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 3, 2023.
Pursuant to Part LG.1.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 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, 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-2023-001199
Div of Waste Management
and Radiation Control
FEB 06 2023
Letter to Mr. Doug Hansen February 1, 2023 Page2 1.Nitrate + nitrite and chloride in monitoring wells at the site have been the subject of ongoinginvestigations at the Mill. Based on the results of the previous investigations, EFRI and theDirector 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 chloridein 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 theactivities associated with the CAP are on-going. Based on information provided by DWMRC inteleconferences on April 27, and May 2, 2011, due to the ongoing activities and actions, the 30-dayplan and schedule for assessment is not required for nitrate + nitrite and chloride exceedances atthis time.2.A Plan and Time Schedule will not be prepared for monitoring wells with two successiveexceedances if those successive exceedances were reported in a previous quarter and/or wereincluded in a previous Source Assessment Report ("SAR") during the current permit periodbeginning March 8, 2021. Inclusion in a previous SAR means that the GWCLs were modifiedbased on conclusions and actions delineated in the previous SAR which were accepted byDWMRC.3.Chloroform and methylene chloride are the subject of the ongoing chloroform pumping programand are covered by State of Utah Notice of Violation ("NOV") and Groundwater Corrective ActionOrder ("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 methylenechloride 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, un­impacted 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 Q4 2022. A 30-day plan and schedule contemplated in Part I.G.1 c) of the GWDP will not 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 February 1, 2023 Page3 MW-11 •The chloride concentration exceeded its GWCL in all of the Q4 2022 sampling events. Asmentioned above, a CAP has been submitted and approved to address nitrate+nitrite contaminationwhich is expected to address chloride in groundwater. The actions specified in the CAP arecurrently being implemented; therefore, a plan to address this consecutive exceedance is notnecessary and is not being submitted.•The nitrate concentration exceeded its GWCL in the Q4 2022 and November sampling events. Asmentioned above, a CAP has been submitted and approved to address nitrate+nitrite contaminationwhich is expected to address chloride in groundwater. The actions specified in the CAP arecurrently being implemented; therefore, a plan to address this consecutive exceedance is notnecessary 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 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 2022 sampling events. MW-26 is used as apumping well for the ongoing chloroform capture program and is expected to yield increasedconcentrations of chloroform. Because this well is used in the chloroform capture program whichis the subject of separate investigations and actions, a plan and time schedule to address theconsecutive exceedances is not necessary and is not being submitted.•The chloride concentration exceeded its GWCL in all of the Q4 2022 sampling events. Asmentioned above, a CAP has been submitted and approved to address nitrate+nitrite contaminationwhich is expected to address chloride in groundwater. The actions specified in the CAP arecurrently being implemented; therefore, a plan to address this consecutive exceedance is notnecessary and is not being submitted.MW-30 •Nitrate + nitrite has exceeded its GWCL in all of the Q4 2022 sampling events. As mentionedabove, a CAP has been submitted and approved and the specified actions are currently beingimplemented; therefore, a plan to address this consecutive exceedance is not necessary and is notbeing submitted.•The chloride concentration exceeded its GWCL in all of the Q4 2022 sampling events. Asmentioned above, a CAP has been submitted and approved to address nitrate+nitrite contaminationwhich is expected to address chloride in groundwater. The actions specified in the CAP arecurrently being implemented; therefore, a plan to address this consecutive exceedance is notnecessary and is not being submitted.
Letter to Mr. Doug Hansen February 1, 2023 Page4 •Selenium has exceeded the GWCL for all of the Q4 2022 sampling events. A SAR was submittedon January 28, 2022. As a result of the SAR, the GWCLs have been recalculated and accepted byDWMRC. The recalculated GWCLs will become effective upon their publication in the nextrevision of the GWDP. As a result of DWMRC's acceptance of the recalculated GWCLs, a planand 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 notedand reported.•Uranium has exceeded the GWCL in the November and December sampling events. A SAR wassubmitted on January 28, 2022. As a result of the SAR, the GWCLs have been recalculated andaccepted by DWMRC. The recalculated GWCLs will become effective upon their publication inthe 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 besubmitted. Until such time as the new GWCLs become effective, the exceedances will continue tobe noted and reported.MW-31 •Nitrate + nitrite has exceeded its GWCL in all of the Q4 2022 sampling events. As mentionedabove, a CAP has been submitted and approved and the specified actions are currently beingimplemented; therefore, a plan to address this consecutive exceedance is not necessary and is notbeing submitted.•The sulfate concentration exceeded its GWCL in the November and December 2022 samplingevents. A SAR was submitted to DWMRC on June 24, 2020. As a result of the SAR, the GWCLshave been recalculated and accepted by DWMRC. The recalculated GWCLs will become effectiveupon their publication in the next revision of the GWDP. As a result of DWMRC' s acceptance ofthe recalculated GWCLs, a plan and schedule to address this consecutive exceedance is notnecessary and will not be submitted. Until such time as the new GWCLs become effective, theexceedances will continue to be noted and reported.•The TDS concentration exceeded its GWCL in all of the Q4 2022 sampling events. A SAR wassubmitted to DWMRC on June 24, 2020. As a result of the SAR, the GWCLs have beenrecalculated and accepted by DWMRC. The recalculated GWCLs will become effective upon theirpublication in the next revision of the GWDP. As a result of DWMRC's acceptance of therecalculated GWCLs, a plan and schedule to address this consecutive exceedance is not necessaryand will not be submitted. Until such time as the new GWCLs become effective, the exceedanceswill continue to be noted and reported.•The chloride concentration exceeded its GWCL in all of the Q4 2022 sampling events. Asmentioned above, a CAP has been submitted and approved to address nitrate+nitrite contaminationwhich is expected to address chloride in groundwater. The actions specified in the CAP arecurrently being implemented; therefore, a plan to address this consecutive exceedance is notnecessary and is not being submitted.•Uranium concentrations exceeded the GWCL in all of the Q4 2022 sampling events. A SAR wassubmitted to DWMRC on April 29, 2021. As a result of the SAR, the GWCLs have beenrecalculated and accepted by DWMRC. The recalculated GWCLs will become effective upon theirpublication in the next revision of the GWDP. As a result of DWMRC's acceptance of therecalculated GWCLs, a plan and schedule to address this consecutive exceedance is not necessary
Letter to Mr. Doug Hansen February 1, 2023 Page5 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 Two new exceedances for the Q4 2022 quarterly well sampling program are listed below. These exceedances will result in an accelerated sampling frequency from quarterly to monthly. The wells listed below will only be sampled during the monthly events for those constituents that exceeded the GWCLs and will be sampled for all constituents listed in the GWDP during the quarterly events as that is the regularly scheduled sampling for the quarterly wells •Selenium in MW-11 was slightly above the GWCL in the Q4 2022 sampling event.•Chloride in MW-25 was slightly above the GWCL in the Q4 2022 sampling event.•pH in MW-30 was slightly below the GWCL in the November 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 th� 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 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 2022 and Q4 2022). MW-24 Beryllium, cadmium, fluoride, nickel, thallium, manganese, and field pH exceeded their GWCLs in MW-24 in the Q3 2022 and Q4 2022 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. Bottle­roll 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 of low 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
Letter to Mr. Doug Hansen February 1, 2023 Page 6
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 2022 and Q4 2022 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 exceedanceis not necessary and is not being submitted.
•Nitrate has exceeded the GWCL for both the Q3 2022 and Q4 2022 sampling events and duringprevious 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 Q3 2022 and Q4 2022 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 theirpublication in the next revision of the GWDP. As a result of DWMRC's acceptance of therecalculated 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 2022 and Q4 2022 sampling events. A SARwas 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 theirpublication in the next revision of the GWDP. As a result of DWMRC's acceptance of therecalculated GWCLs, a plan and schedule to address this consecutive exceedance is not necessaryand will not be submitted. Until such time as the new GWCLs become effective, the exceedances
will continue to be noted and reported.
MW-29
•Uranium concentrations exceeded the GWCL for both the Q3 2022 and Q4 2022 sampling events.A SAR was submitted to DWMRC on September 7, 2021. As a result of the SAR, the GWCLshave been recalculated and accepted by DWMRC. The recalculated GWCLs will become effectiveupon 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 notnecessary and will not be submitted. Until such time as the new GWCLs become effective, theexceedances will continue to be noted and reported.
2.2 Semi-annual Wells with New Exceedances Reported in Q4
Two new single exceedances for the Q4 2022 semi-annual well sampling program are listed below.
•Chloride in MW-17 was slightly above the GWCL in the Q4 sampling event.•pH in MW-37 was slightly below the GWCL in the Q4 sampling event.
Monitoring Well (Water Constituent Exceeding GWCL
Class)
Nitrate+ Nitrite (as N) (mg/L)
Chloride (mg/L)
MW-II Manganese (ug/L)
(Class II) Sulfate (mg/L)
TDS (mg/L)
Selenium (ug/L)
MW-25 (Class TDS (mg/L)
UT) Chloride (mg/L)
MW-26 Nitrate+ Nitrite (as N) (mg/L)
(Class UT) Chloroform (ug/L)
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)
TDS (mg/L) (Class Ill) Uranium (ug/L)
Chloride (mg/L)
MW-12 Uranium (ug/L)
(Class ill) Selenium (ug/L)
MW-17 Chloride (mg/L) (Class III)
Beryllium (ug/L)
Cadmium (ug/L)
Fluoride (m�/1)
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 III) Nitrate+ Nitrite (as N) (mg/L)
Uranium (ug/L)
MW-29 Uranium (ug/L) (Class UT) MW-32 Chloride (mg/L) (Class Ill)
MW-37 Field pH (S.U.) (Class Ill)
Notes:
NS= Not Required and Not Sampled
NA= Not Applicable
Exceedances are shown in yellow
GWCLin Ql 2021 March 8, Sample 2021 Date GWDP
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 1/14/2 I
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
6.61 -8.5 NS
Ql 2021 Results
February February March March 2021 2021 Ql 2021 Monthly 2021 Monthly 2021
Result Monthly Monthly Sample Sample Result Result Date Date
Required Quarterly Sampling Wells
1.21 NA NA
46.4 46.4 46.9
185 254 221 2/9/21 3/8/21 1140 1260 1270
2010 2160 1950
<5 NA NA
2660 NS NA NS NA
34 NA NA
0.619 0.764 0.617
2200 2/10/21 1930 3/9/21 2190
57.4 71.3 63.9
17.7 14.3 17.0
184 189 192
55.6 2/10/21 55.3 3/9/21 56.3 7.49 7.25 7.14
9.86 11.6 10.2
17.1 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
128 NA NA
1-1.0 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 GWOP was noted in the March monthly data.
Table 3 -GWCL Exceedances under the March 8, 2021 GWDP
Q2 2021 Results
May 2021 June 2021 Q2 2021 May 2021 June 2021 Q3 2021 Sample Q2 2021 Monthly Monthly Monthly Monthly Sample Result Sample Sample Date Result Result Date Date Date
Required Quarterly Sampling Wells
0.948 NA NA
47.7 46.4 52./
237 NA NA 04/20/21 5/10/21 6/8/21 7/27/21 1290 1280 1270
2110 2190 1960
<5 NA NA
04/14/21 2720 NS NA NS NA 7/28/21 34.8 NA NA
1.42 1.06 0.368
04/21/21 777 5/11/21 733 6/8/21 /590 7/28/21
57.5 69.6 54.9
17.7 18.6 17.0 162 188 170 04/14/21 55.7 5/11/21 58.3 6/8/21 54.1 7/29/21 7.20 7.20 7.36 10.3 10.7 9.84
18.6 18.9 20.6
1170 1200 1170 04/13/21 2300 5/10/21 2610 6/7/21 2400 7/27/21 20.l 21.7 20.8
377 384 374
Required Semiannual Sampling Wells
4/20/21 22.9
28.8 NS NA NS NA 7/21/21
4/26/21 32.6 NS NA NS NA NS
2.78 NA NA
8.08 NA NA
0.925 NA NA 72.4 NA NA 7540 NA NA 4/29/21 3.02 NS NA NS NA 7/29/21
3.18 NA NA
2960 NA NA
4460 NA NA
5.00 NA NA
6.57 4/15/21 NS NA NS NA 7/22/21 0.69
U4 NA NA
4/15/21 13.4 NS NA NS NA 7/23/21 4.09 NA NA 8.52 NA NA
4/14/21 16.2 NS NA NS NA 7/22/21
4/13/21 31.8 NS NA NS NA 7/28/21
5/12/21 7.00 NS NA NS NA NS
Q3 2021 Results Q4 2021 Results
August August September September November December December 2021 Q4 2021 November Q3 2021 Monthly 2021 2021 2021 Sample Q4 2021 2021 2021 2021 2021 Result Monthly Monthly Monthly Result Monthly Monthly Monthly Monthly Sample Date Result Sample Date Result 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 NA NA 286 261 300 8/10/21 9/7/21 10/20/21 11/16/21 12/13/21 1470 1370 1240 1360 1300 1350
2680 NA NA 2200 2230 2140
<5 NA NA 6.75 NA NA
3100 NA NA 2680 2920 2590 NS NS 10/20/21 11/16/21 12/14/21 34.2 NA NA 33.1 NA NA
0.352 1.42 0.710 0.928 1.18 1.76 723 8/10/21 996 9/9/21 516 10/21/21 540 11/16/21 568 12/15/21 1160
54.0 6/.4 59.3 55.2 56.9 75.9
20.6 16.5 15.4 14.3 18.0 18.6
188 161 183 182 182 184
56.3 8/9/21 56.J 9/8/21 60.4 10/19/21 54.6 11/17/21 53.6 12/14/21 58.8 6.98 6.84 6.70 6.77 7.18 7.04
9.60 9.38 9.74 9.76 9.67 10.1
18.7 15.7 16.0 18.I 19.3 17.9 1210 1130 1130 1220 l/80 1220 3100 8/9/21 2600 9/7/21 2870 10/19/21 2600 11/15/21 2610 12/13/21 2420
20.0 19.3 20.2 20.9 21.5 21.8
391 365 356 371 366 376
Required Semiannual Sampling Wells Required Semiannual Sampling Wells
22.2 23.1 NS NA NS NA 11/9/21 NS NA NS NA 32.4 26.4
NA NS NA NS NA 11/8/21 33.4 NS NA NS NA
2.71 NA NA 2.66 NA NA
9.26 NA NA 9.30 NA NA
1.4 NA NA 0.988 NA NA
76.7 NA NA 76.7 NA NA
7890 NA NA 7430 NA NA
2.91 NS NA NS NA 11/10/21 3.14 NS NA NS NA 1.92 NA NA 1.56 NA NA 3050 NA NA 3220 NA NA 4940 NA NA 4730 NA NA
5.85 NA NA 5.23 NA NA
6.32 3.88 NS NA NS NA 10/26/21 NS NA NS NA NA 0.65
152 NA NA 1-17 NA NA
18.5 NS NA NS NA 10/26/21 11.2 NS NA NS NA 6.09 NA NA 1.89 NA NA
13.80 NA NA 6.03 NA NA
15.8 NS NA NS NA 10/27/21 14.9 NS NA NS NA
36.5 NS NA NS NA 11/2/21 36.1 NS NA NS NA
NA NS NA NS NA 11/17/21 7.06 NS NA NS NA
Monitoring Well (Water Class) MW-II (Class fl) MW-25 (Class ill) MW-26 (Class III) MW-30 (Class II) MW-31 (Class III) MW-12 (Class ill) MW-17 (Class III) MW-24 (Class III) MW-27 (Class III) MW-28 (Class lII) MW-29 (Class III) MW-32 !Class III)MW-37(Class lII)Ql 2022 Results February February March 2022 March GWCLin Ql 2022 2022 Constituent Exceeding GWCL March 8, 2021 Sample Ql 2022 Monthly 2022 Monthly 2022 Result Monthly Sample Monthly GWDP Date Sample Result Date Result Date
Required Quarterly Sampling Wells Nitrate+ Nitrite (as N) (mg/L) 2.5 2.55 NA NA Chloride (mg/L) 39.16 SJ.I 57.2 67.7 Manganese (ug/L) 237 156 233 224 1/18/22 2/8/22 3/8/22 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 1/20/22 818 2/9/22 1580 3/8/22 1460 Chloride (mg/L) 58.31 77.1 58.6 64.1 Nitrate+ Nitrite (as N) (mg/L) 2.5 14.5 13.6 16.6 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 7.20 7.12 Uranium (ug/L) 9.82 JO.I 10.3 9.9 Nitrate+ Nitrite (as N) (mg/L) 5 18.0 13.5 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 22.1 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 1 NA NA Nickel (mg/L) 50 80.9 NA NA Manganese (ug/L) 7507 7630 NA NA Thallium (ug/L) 2.01 1/27/22 2.66 NS NA NS NA Gross Aloha !oCi/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) 105 140 NA NA Selenium (ug/L) II.I 1/20/22 13.3 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 IS.I 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 the DWMRC fetter of August 8, 2022, these constituents will no longer be monitored on an accelerated schedule.
These constituents will be dropped from this report after this quarter.
Table 3-GWCL Exceedances under the March 8, 2021 GWDP
Q2 2022 Results May 2022 June 2022 Q2 2022 May 2022 June 2022 Q3 2022 Sample Q2 2022 Monthly Monthly Monthly Monthly Sample Result Sample Sample Date Date Result Date Result Date
Required Quarterly Sampling Wells 2.2 1.6 1.9 54.9 59.5 46.4 4/18/22 180 5/4/22 254 6/6/22 228 7/12/22 1240 1270 866 2060 2290 2360 10.8 NA NA 4/12/22 3600 5/3/22 2660 6/7/22 2730 7/13/22 33.4 NA NA 0.8 I.I 0.60 4/20/22 447 5/4/22 616 6/7/22 1250 7/14/22 56.8 63.2 47.4 17 15 11.0
173 195 126 4/20/22 64.9 5/4/22 69.4 6/7/22 65.7 7/13/22 6.92 7.24 7.32 9.6 JO.I 9.6 18.0 13.0 13.0
JJ80 1220 1110 4/11/22 4300 5/3/22 2660 6/6/22 2690 7/12/22 22.0 22.9 21.5
372 381 351
Required Semiannual Sampling Wells 4/19/22 20.5 31.3 NS NA NS NA 7/14/22 4/18/22 31.5 NS NA NS NA NS 2.5 NA NA 9.20 NA NA 0.8 NA NA 74.3 NA NA 7070 NA NA 7/20/22 4/27/22 3.1 NS NA NS NA 7/28/22 2.28 NA NA 3120 NA NA 3350 NA NA 4.81 NA NA 6.30 4/12/22 NS NA NS NA 7/15/22 0.90
130 NA NA 4/19/22 19.8 NS NA NS NA 7/15/22 5.1 NA NA JO.JO NA NA 4/14/22 15.7 NS NA NS NA 7/14/22 4/11/22 28.6 NS NA NS NA 7/15/22 5/17/22 7.04 NS NA NS NA NS Q3 2022 Results Q4 2022 Results August August September September November November December December 2022 Q42022 Q3 2022 Monthly 2022 2022 2022 Sample Q42022 2022 2022 2022 2022 Result Monthly Monthly Monthly Result Monthly Monthly Monthly Monthly Sample Result Sample Date Result Date Sample Date Result Sample Date Result Date
Required Quarterly Sampling Wells Required Quarterly Sampling Wells 2.12 2.45 2.65 2.90 2.74 1.30 54.0 67.4 68.1 72.1 71.9 52.3
297 201 212 214 220 273 8/8/22 9/21/22 10/10/22 11/8/22 12/14/22 1390 1260 1300 1140 1140 1330 2520 3230 2280 2570 2270 2370 9.3 NA NA 15.5 NA NA 2830 8/9/22 2780 9/20/22 2750 10/10/22 2660 11/9/22 2690 12/14/22 2780 22.4 NA NA 35.8 NA NA 1.63 1.56 0.491 0.632 0.408 2.66 <1.0 8/9/22 JJ20 9/20/22 810 10/13/22 749 11/10/22 512 12/15/22 460
61.0 65.0 62.I 65.5 59.2 60.6
17.6 13.5 16.5 17.9 15.9 16.J 108 185 182 196 156 195
61.1 8/9/22 64.3 9/20/22 70.0 10/13/22 65.1 11/9/22 75.6 12/13/22 70.8 7.33 7.33 6.81 6.84 6.37 6.59 10.0 JO.I 8.3 9.8 JO.I 13.0
16.9 16.8 17.l 17.0 16.0 12.6 1260 1230 1200 972 1380 1280
2700 8/8/22 2700 9/20/22 2830 10/11/22 2720 11/8/22 2670 12/13/22 2700
22.6 22.7 18.8 23.3 24.5 26.2
421 396 J90 397 243 335
Required Semiannual Sampling Wells Required Semiannual Sampling Wells 21.6 21.2 29.2 NS NA NS NA 10/13/22 32.1 NS NA NS NA NA NS NA NS NA 10/17/22 54.0 NS NA NS NA 2.7 NA NA 3.3 NA NA 8.6 NA NA 10.9 NA NA 0.760 NA NA 1.53 NA NA 69.9 NA NA 86.9 NA NA 7540 NA NA 8130 NA NA 3.0 NS NA NS NA 11/2/22 3.5 NS NA NS NA 2.55 NA NA 2.70 NA NA 2800 NA NA 2680 NA NA 4200 NA NA 4440 NA NA 4.89 NA NA 4.39 NA NA 4.80 5.18 5.26 NS NA NS NA 10/19/22 NS NA NS NA 0.530 0.722 159 NA NA 161 NA NA 20.8 NS NA NS NA 10/12/22 23.7 NS NA NS NA 5.16 NA NA 5.69 NA NA 12.4 NA NA 12.5 NA NA 15.J NS NA NS NA 10/12/22 15.2 NS NA NS NA 28.2 NS NA NS NA 10/11/22 37.1 NS NA NS NA NA NS NA NS NA 11/1/22 6.60 NS NA NS NA