DRC-2022-022129 - 0901a0688110a9aa

Div of Waste Management and Radiation Control
OCT 2 5 2022
'ENERGY FUELS
October 20, 2022
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
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 third quarter ("Q3") groundwater monitoring during the period from July 1, to September 30, 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 October 6, 2022.
Pursuant to Patt I.G. l .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, 202 I, which sets revised GWCLs, requirements
to perform accelerated monitoring for certain constituents under Part I.G. 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 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-2022-022129
Letter to Mr. Doug Hansen October 20, 2022 Page 2
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 Q3 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 October 20, 2022 Page 3
MW-11
•The chloride concentration exceeded its GWCL in all of the Q3 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-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 the August and September 2022 sampling events. MW-26is used as a pumping well for the ongoing chloroform capture program and is expected to yieldincreased concentrations of chloroform. Because this well is used in the chloroform captureprogram which is the subject of separate investigations and actions, a plan and time schedule toaddress the consecutive exceedances is not necessary and is not being submitted.
•Nitrate has exceeded its GWCL in the Q3 and August 2022 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 Q3 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 Q3 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 the August and September 2022 samplingevents. As mentioned above, a CAP has been submitted and approved to address nitrate+nitritecontamination which is expected to address chloride in groundwater. The actions specified in theCAP are currently being implemented; therefore, a plan to address this consecutive exceedance isnot necessary and is not being submitted.
•Selenium has exceeded the GWCL for all of the Q3 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 next
Letter to Mr. Doug Hansen October 20, 2022 Page4 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 July and August 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.MW-31 •Nitrate + nitrite has exceeded its GWCL in all of the Q3 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 all of the Q3 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 TDS concentration exceeded its GWCL in all of the Q3 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 Q3 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 Q3 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 necessaryand will not be submitted. Until such time as the new GWCLs become effective, the exceedanceswill continue to be noted and reported.
Letter to Mr. Doug Hansen October 20, 2022 Page 5
1.2 Quarterly Wells with New Exceedances Reported in Q3
There are no new exceedances for the Q3 2022 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 (Q2 2022 and Q3 2022).
MW-24
Beryllium, cadmium, fluoride, nickel, thallium exceeded their GWCLs in MW-24 in the Q2 2022 and Q3 2022 sampling events. MW-24 was resampled during the quarter due to a laboratory issue and both field pH measurements exceeded the GWCL.
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 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 Q2 2022 and Q3 2022 sampling events and duringprevious quarters. As mentioned above, a CAP has been submitted and approved and the specifiedactions are currently being implemented; therefore, a plan to address this consecutive exceedanceis not necessary and is not being submitted.
Letter to Mr. Doug Hansen
October 20, 2022 Page 6
•Nitrate has exceeded the GWCL for both the Q2 2022 and Q3 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 exceedance
is not necessary and is not being submitted.
•Uranium has exceeded the GWCL for both the Q2 2022 and Q3 2022 sampling events. A SARwas submitted to DWMRC on October 19, 2020. As a result of the SAR, the GWCLs have beenrecalculated 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 Q2 2022 and Q3 2022 sampling events. A SARwas submitted to DWMRC on October 19, 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 the
recalculated 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.
MW-29
•Uranium concentrations exceeded the GWCL for both the Q2 2022 and Q3 2022 sampling events.A SAR was submitted to DWMRC on September 7, 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 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 Q3
There are no new exceedances for the Q3 2022 semi-annual well sampling program.
Yours truly, f�Yr-iud_
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-II (Class II) Manganese (ug/L) Sulfate (mg/L) TDS (mg/L) MW-25 (Class TDS (mg/L) Ill) Nitrate+ Nitrite (as N) (mg/L) MW-26 Chloroform (ug/L) (Class Ill) Chloride (mg/L) TDS (mg/L) Nitrate+ Nitrite (as N) (mg/L) MW-30 Chloride (mg/L) Selenium (ug/L) (Class II) TDS (mg/L) Uranium (ug/L) Nitrate+ Nitrite (as N) (mg!L) MW-31 Sulfate (mg/L) (Class III) TDS (mg/L) Uranium (ug/L) Chloride (mg/L) MW-12 Uranium (ug/L) (Class III) Selenium (ug/L) Beryllium (ug/L) Cadmium (ug/L) Fluoride (mg/L) Nickel (mg/L) MW-24 Manganese (ug/L) (Class Ill) 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 LU) Nitrate+ Nitrite (as N) (mg/L) Uranium (ug/L) MW-29 Uranium (ug/L) (Class Ill) MW-32 Chloride (mg/L) (Class III) Notes:
NS= Not Required and Not Sampled
NA= Not Applicable
GWCLin QI 2021 March 8, Sample 2021 Date GWDP 2.5 39.16 237 1/12/21 1309 2528 2976 1/11/21 0.62 70 1/14/21 58.31 3284.19 2.5 128 53.6 1/11/21 1918 9.82 5 993 2132 1/12/21 15 143 23.5 39 l/14/21 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 l/14/21 QI 2021 Results
February February March March 2021 2021 Q2 2021 QI 2021 Monthly 2021 Monthly 2021 Sample Result Monthly Monthly Sample Sample Date
Date Result Date Result
Required Quarterly Sampling Wells 1.21 NA NA 46.4 46.4 185 2/9/21 254 3/8/21 221 04/20/21 1140 1260 1270 2010 2160 1950 2660 NS NA NS NA 04/14/21 0.619 0.764 0.617 2200 2/10/21 1930 3/9/21 2190 04/21/21 57.4 71.3 63.9 3100 2700 3060 17.7 14.3 17.0
184 189 192
55:6 2/10/21 ' 55:3 3/9/21 56.3 04/14/21 1660 NA NA ,: 9.86 ' '"· ll.6 10.2
17./ 14.3 17.4
1070 1/30 1210
2460 2/9/21 2960 3/8/21 2400 04/13/21 /9.7 22.2 20.2
354 380 388
Required Semiannual Sampling Wells
25.0 35.1 NS NA NS NA 4/20/21 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 4/29/21 2.94 NA NA 2980 NA NA 4260 NA NA 5.08 NA NA 5.16 NS NA NS NA 4/15/21 NA 128 NA NA 14.0 NS NA NS NA 4/15/21 3.44 NA NA 10.3 NA NA 16.9 NS NA NS NA 4/14/21 36.9 NS NA NS NA 4/13/21 Table 1-GWCL Exceedances under the March 8, 2021 GWDP
Q2 2021 Results Q3 2021 Results Q4 2021 Results
May 2021 June 2021 August August September September May 2021 June 2021 Q32021 2021 Q4 2021 November November December December
Q22021 Monthly Monthly Monthly Monthly Sample Q32021 Monthly 2021 2021 2021 Sample Q4 2021 2021 2021 2021 2021
Result Sample Sample Result Monthly Monthly Monthly Result Monthly Monthly Monthly Monthly Result Result Date Sample Date 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 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 /370 1240 1360 1300 1350 2110 2190 1960 2680 NA NA 2200 2230 2140 2720 NS NA NS NA 7/28/21 3100 NS NA NS NA 10/20/21 2680 11/16/21 2920 12/14/21 2590 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 723 996 516 540 568 1160 7/28/21 8/10/21 9/9/21 10/21/21 11/16/21 12/15/21 57.5 69.6 54.9 54.0 61.4 59.3 55.2 56.9 75.9 2790 NA NA 3390 NA NA 3010 3150 3130 17.7 18.6 17.0 20.6 16.5 15.4 14.3 18.0 18.6
162 188 170 188 161 183 182 182 184 55.7 5/11/21 58.3 6/8/21 54.1 7/29/21 56.3 8/9/21 56./ 9/8/21 60.4 10/19/21 54.6 11/17/21 53.6 12/14/21 58.8 1580 NA NA 20/0 NA NA 1790 1710 1610 10.3 10.7 9.84 9.60 9.38 9.74 9.76 9.67 JO.I
18.6 18.9 20.6 18.7 15.7 16.0 18.1 19.3 17.9
1170 1200 1170 1210 1/30 1/30 1220 1/80 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 12/13/21 2420
20./ 21.7 20.8 20.0 19.3 20.2 20.9 21.5 21.8
377 384 374 391 365 356 371 366 376
Required Semiannual Sampling Wells Required Semiannual Sampling Wells Required Semiannual Sampling Wells 22.9 22.2 NS NA NS NA 7/21/21 NS NA 28.8 32.4 23.1 NS NA l 1/9/21 26.4 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 I 0/26/21 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 I 0/26/21 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 I 0/27/21 14.9 NS NA NS NA 31.8 NS NA NS NA 7/28/2 l 36.5 NS NA NS NA l 1/2/21 36./ NS NA NS NA
Monitoring Well (Water Class)
MW-II
(Class II)
MW-25 (Class
III)
MW-26
(Class Ill)
MW-30
(Class II)
MW-31
(Class III)
MW-12
(Class Ill)
MW-24
(Class Ill)
MW-27
(Class Ill)
MW-28
(Class Ill)
MW-29
(Class Ill)
MW-32
(Class III)
Table 1-GWCL Exceedances under the March 8, 2021 GWDP
QI 2022 Results
February February March 2022 March 2022 GWCL in March QI 2022 QI 2022 2022 Monthly Constituent Exceeding GWCL 8,2021 GWDP Sample Date Result 2022 Monthly Monthly Sample Monthly
Sample 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 51.1 57.2 67.7
Manganese (ug/L) 237 1118/22 156 2/8/22 233 3/8/22 224
Sulfate (mg/L) 1309 1020 1240 1170
TDS (mg/L) 2528 2050 1900 2080
TDS (mg/L) 2976 1/17/22 2720 2/9/2022 2690 3/7/2022 2610
Nitrate+ Nitrite (as N) (m_g/L) 0.62 0.601 0.367 0.600
Chloroform (ug/L) 70 l/20/22 818 2/9/22 1580 3/8/22 1460
Chloride (mg/L) 58.31 77.l 58.6 64.1
TDS (mg/L) 3284.19 3080 2980 2870
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 l/ l 7/22 56.7 2/9/22 57.7 3/7/22 62.0
TDS (mg/L) 1918 1680 1640 1500
Uranium (u_g/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 22.1 1/20/22 NS NA NS NA Selenium (ug/L) 39 25.6
Beryllium (ug/L) 2 2.71 NA NA
Cadmium (ug/L) 6.43 8.46 NA NA
Fluoride (m_g/L) 0.47 I NA NA
Nickel (mg/L) 50 80.9 NA NA
Manganese (ug/L) 7507 7630 NA NA
Thallium (ug/L) 2.01 l/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) l l.l 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 Ill 8/22 15.1 NS NA NS NA
Chloride (mg/L) 35.39 l/19/22 35.0 NS NA NS NA
Pursuant to the DWMRC letter of August 8, 2022, these constituents will no longer be monitored on an accelerated schedule. These constituents will
be dropped from this repo after this quarter.
Q2 2022 Results
May2022 May 2022 June 2022
Q2 2022 Q2 2022 Monthly
Sample Date Result Monthly Monthly Sample Sample Date Result Date
Required Quarterly Sampling Wells
2.2 1.6
54.9 59.5
4/18/22 180 5/4/22 254 6/6/22
1240 1270
2060 2290
4/12/22 3600 5/3/2022 2660 6/7/2022
0.8 1.1
4/20/22 447 5/4/22 616 6/7/22 56.8 63.2
2560 2860
17 15
173 195
4/20/22 64.9 5/4/22 69.4 6/7/22
1400 1640
9.6 JO.I
18.0 13.0 1180 1220
4/11/22 4300 5/3/22 2660 6/6/22
22.0 22.9 372 381
Required Semiannual Sampling Wells
20.5 4/19/22 31.3 NS NA NS
2.5 NA
9.20 NA
0.8 NA
74.3 NA
7070 NA
4/27/22 3.1 NS NA NS
2.28 NA
3120 NA
3350 NA
4.81 NA
6.30 4/12/22 NS NA NS 0.90
130 NA
4/19/22 19.8 NS NA NS 5.1 NA
JO.JO NA
4/14/22 15.7 NS NA NS
4/11/22 28.6 NS NA NS
Q3 2022 Results
June 2022 August 2022 August 2022 September September Q32022 Q32022 2022 2022 Monthly Sample Date Result Monthly Monthly Monthly Monthly Result Sample Date Result Sample Date Result
Required Quarterly Sampling Wells
1.9 2.12 2.45 2.65
46.4 54.0 67.4 68.J
228 7/12/22 297 8/8/22 201 9/21/22 212
866 1390 1260 1300
2360 2520 3230 2280
2730 7/13/22 2830 8/9/2022 2780 9/20/2022 2750
0.60 1.63 1.56 0.491
1250 7/14/22 <1.0 8/9/22 JJ20 9/20/22 810
47.4 61.0 65.0 62.1
3120 3140 3120 NA
JJ.O 17.6 13.5 16.5
126 108 185 182
65.7 7/13/22 61.l 8/9/22 64.3 9/20/22 70.0
1660 1710 1580 NA
9.6 10.0 JO.I 8.3
13.0 16.9 16.8 17.1
1110 1260 1230 1200 2690 7/12/22 2700 8/8/22 2700 9/20/22 2830
21.5 22.6 22.7 18.8
351 421 396 390
Required Semiannual Sampling Wells
NA 7/14/22 21.6
29.2 NS NA NS NA
NA 2.7 NA NA
NA 8.6 NA NA
NA 0.760 NA NA
NA 69.9 NA NA
NA 7/20/22 7540 NA NA
NA 7/28/22 3.0 NS NA NS NA
NA 2.55 NA NA
NA 2800 NA NA
NA 4200 NA NA
NA 4.89 NA NA 4.80
5.18 NA 7/15/22 NS NA NS NA 0.530
NA 159 NA NA
NA 7/l 5/22 20.8 NS NA NS NA
NA 5.16 NA NA
NA 12.4 NA NA
NA 7/14/22 15.l NS NA NS NA
NA 7/15/22 28.2 NS NA NS NA