DRC-2020-012443 - 0901a06880cdbe86

July 13, 2020
ENERGY FUELS
Lirki Manz.:•rjere.ent
and Radlation Control
JUL 1 5 2020
Energy Fuels Resources (USA) Inc. 225 Union Blvd, Suite 600
Lakewood, CO, US, 80228
303 974 2140 Di3C- 20 20 012443 www.energyfuels.com
VIA PDF AND OVERNIGHT DELIVERY
Ty L. Howard
Director
Division of Waste Management and Radiation Control
State of Utah Department of Environmental Quality
195 North 1950 West
P.O. Box 144880
Salt Lake City, UT 84114-4880
Re: State of Utah Ground Water Discharge Permit No. UGW370004
White Mesa Uranium Mill — Notice Pursuant to Part I.G.1 (a)
Dear Mr. Howard:
The White Mesa Mill (the "Mill") performed second quarter ("Q2") groundwater monitoring during the
period from April 1, to June 30, 2020 under the March 19, 2019 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 June 22, 2020.
Pursuant to Part I.G.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 19, 2019, 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 19, 2019, 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:
Letter to Mr. Ty L. Howard
July 13, 2020 Page 2
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 DWIVIRC 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 19, 2019. 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 Q2 2020. A 30-day plan and schedule contemplated in Part I.G.1 c) of
the GWDP will not be required for the reasons 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. Ty L. Howard
July 13, 2020 Page 3
MW-11
• Manganese concentrations exceeded the GWCL in MW-11 in all of the Q2 sampling events. This
consecutive exceedance is addressed in the SAR, dated June 27, 2019. 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-26
• Nitrate + nitrite has exceeded its GWCL in all of the Q2 2020 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.
• Chloroform has exceeded its GWCL in all of the Q2 2020 and 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 all of the Q2 2020 and 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 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.
MW-30
• Nitrate + nitrite has exceeded its GWCL in all of the Q2 2020 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 Q2 2020 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. Ty L. Howard
July 13, 2020
Page 4
• Uranium concentrations exceeded the GWCL in MW-30 in all of the Q2 2020 sampling events.
This consecutive exceedance is addressed in the SAR, dated January 15, 2019. As a result of the
SAR, the GWCLs have been recalculated and accepted by DWIVIRC. 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 concentrations exceeded the GWCL in MW-30 in all of the Q2 2020 sampling events.
This consecutive exceedance is addressed in the SAR, dated January 15, 2019. 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 Q2 2020 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 Q2 2020 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 TDS concentration exceeded its GWCL in all of the Q2 2020 sampling events. A Plan and
Time Schedule was submitted to DWMRC on February 27, 2020. The Plan and Time Schedule
was approved by DWMRC by letter dated March 26, 2020. A SAR was submitted to DWMRC on
June 24, 2020. Because a SAR has been submitted, a plan to address this consecutive exceedance
this quarter is not necessary and will not be submitted.
• The sulfate concentration exceeded its GWCL in all of the Q2 2020 sampling events. A Plan and
Time Schedule was submitted to DWMRC on February 27, 2020. The Plan and Time Schedule
was approved by DWMRC by letter dated March 26, 2020. A SAR was submitted to DWMRC on
June 24, 2020. Because a SAR has been submitted, a plan to address this consecutive exceedance
this quarter is not necessary and will not be submitted.
1.2 Quarterly Wells with New Exceedances Reported in Q2
One new exceedance for the Q2 2020 quarterly well sampling program is listed below. This exceedance
will result in an accelerated sampling frequency from quarterly to monthly. The well listed below will only
be sampled during the monthly events for those constituents that exceeded the GWCLs. The well listed
below 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
• Uranium in MW-31 was slightly above the GWCL in the Q2 2020 sampling event.
Letter to Mr. Ty L. Howard
July 13, 2020
Page 5
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.
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 (Q1 2020 and Q2 2020).
MW-24
• Beryllium concentrations exceeded the GWCL in MW-24 in the Q1 2020 and Q2 2020 sampling
events. Beryllium exceedances 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. DW1VIRC approved the collocated well strategy by letter dated September 5, 2019. As a result
of DWMRC's acceptance of the study strategy, a plan and schedule to address this consecutive
exceedance 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.
• Cadmium concentrations exceeded the GWCL in MW-24 in the Q1 2020 and Q2 2020 sampling
events. Cadmium exceedances 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. As a result
of DWMRC's acceptance of the study strategy, a plan and schedule to address this consecutive
exceedance 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.
• Fluoride concentrations exceeded the GWCL in MW-24 in the Q1 2020 and Q2 2020 sampling
events. Fluoride exceedances 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. As a result
of DWMRC's acceptance of the study strategy, a plan and schedule to address this consecutive
exceedance 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.
• Nickel concentrations exceeded the GWCL in MW-24 in the Q1 2020 and Q2 2020 sampling
events. Nickel exceedances 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. As a result of
DWMRC' s acceptance of the study strategy, a plan and schedule to address this consecutive
exceedance 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. Ty L. Howard
July 13, 2020
Page 6
MW-27
• The nitrate+nitrite concentration exceeded its GWCL for both the Q1 2020 and Q2 2020 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-28
• Chloride has exceeded the GWCL for both the Q1 2020 sampling event and the Q2 2020 sampling
event 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 Q1 2020 sampling event and the Q2 2020 sampling
event. A Plan and Time Schedule that addresses exceedances of uranium and selenium in MW-28
was submitted to DWMRC on May 21, 2020. The Plan and Time Schedule was approved by
DWMRC by letter dated June 22, 2020; therefore, an additional plan to address this consecutive
exceedance is not necessary and is not being submitted.
MW-32
• Chloride has exceeded the GWCL for both the Q1 2020 sampling event and the Q2 2020 sampling
event. 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.
2.2 Semi-annual Wells with New Exceedances Reported in Q2
One new single exceedance for the Q2 2020 semi-annual well sampling program is listed below.
• Selenium in MW-12 was slightly above the GWCL in the Q2 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.
Your,s truly,
e
E ERG FUELS RESOURCES (USA) INC.
Kathy Weinel
Quality Assurance Manager
cc: Scott Bakken, David Frydenlund, Paul Goranson, Logan Shumway, Terry Slade
Table 1 - GWCL Exceedances for Second Quarter 2020 under the March 19. 2019 GWDP
Q2 2019 Results Q3 2019 Results Q4 2019 Results
Monitoring Well
(Water Class) Constituent Exceeding GWCL GWCL in March
19, 2019 GWDP
Q2 2019
Sample Date
Q2 2019
Result
May 2019
Monthly
Sample Date
May 2019
Monthly
Result
June 2019
Monthly
Sample Date
June 2019
Monthly
Result
Q3 2019
Sample Date
Q3 2019
Result
August 2019
Monthly
Sample Date
August 2019
Monthly
Result
Sept. 2019
Monthly
Sample Date
Sept. 2019
Monthly
Result
Q4 2019
Sample Date
Q4 2019
Result
November
2019 Monthly
Sample Date
November
2019
Monthly
Result
December
2019
Monthly
Sample Date
December
2019
Monthly
Result
Required Quarterly Sampling Wells
MW-11 (Class II)
Chloride (mg/L) 39.16
4/24/2019
34
5/7/2019
NA
6/3/2019
NA
7/16/2019
48.4
8/5/2019
NA
9/24/2019
NA
10/15/2019
30.8
11/12/2019
39.1
12/3/2019
35.4
Sulfate (mg/L) 1309 1160 NA NA 1410 NA NA 1290 1140 1100
Manganese (ug/L) 164.67 181 210 210 199 202 174 185 206 167
MW-14 (Class III) Fluoride (mg/L) 0.22 4/23/2019 <0.100 NS NA NS NA 7/15/2019 0.248 NS NA NS NA 10/9/2019 <0.100 11/13/2019 0.127 12/3/2019 0.120
Sulfate (mg/L) 2330 1780 NA NA 2450 NA NA 2180 2110 2120
MW-25 (Class III) Cadmium (ug/L) 1.5 4/10/2019 1.30 5/8/2019 1.41 6/4/2019 1.47 7/15/2019 1.23 8/6/2019 1.37 9/23/2019 1.38 10/9/2019 1.45 11/13/2019 1 36 12/4/2019 1.45
MW-26 (Class 111)
Nitrate + Nitrite (as N) (mg/L) 0.62
4/24/2019
3.00
5/7/2019
0.986
6/4/2019
3.16
7/16/2019
2.06
8/6/2019
3.10
9/24/2019
1.59
10/9/2019
2.35
11/13/2019
2.90
12/4/2019
2.32
Chloroform (ug/L) 70 4140 1140 778 3110 1090 1540 1710 1280 1110
Chloride (mg/L) 58.31 82.0 73.0 72.6 75.2 83.5 62.1 73.8 62.3 57.7
Methylene Chloride (ug/L) 5 4.16 1.69 <1.00 10.7 1.12 3.35 2.95 1.73 2.64
MW-30 (Class II)
Nitrate + Nitrite (as N) (mg/L) 2.5
4/9/2019
18.5
5/7/2019
17.9
6/3/2019
15.8
7/16/2019
19.3
8/6/2019
15.8
9/24/2019
17.9
10/8/2019
18.2
11/13/2019
17.2
12/4/2019
17.8
Chloride (nT/L) 128 138 175 165 181 190 176 170 180 185
Selenium (ug/L) 47.2 53.6 47 1 49.9 48.4 50.9 49.1 56.8 47.8 56.4
Uranium (ug/L) 8.32 8.62 8.15 8.88 9.03 9.39 8.12 8.69 9.29 8.99
MW-31 (Class III)
Nitrate + Nitrite (as N) (mg/L) 5
4/10/2019
19.7
5/7/2019
18.9
6/3/2019
19.7
7/15/2019
19.8
8/5/2019
17.0
9/23/2019
19.5
10/9/2019
19.8
11/12/2019
18.8
12/3/2019
18.3
Sulfate (mg/L) 993 917 NA NA 1150 NA NA 1010 990 1020
TDS (mg/L) 2132 2080 NA NA 2580 NA NA 2280 2650 2030
Uranium (ug/L) 15 14 NA NA 14.3 NA NA 14.4 NA NA
Chloride (mg/L) 143 294 346 325 374 372 365 318 338 343
MW-36 (Class III) Sulfate (mg/L) 3146.21 4/18/2019 2470 5/21/2019 NA 6/3/2019 NA 7/16/2019 3170 8/6/2019 NA 9/23/2019 NA 10/8/2019 2850 11/13/2019 2590 12/3/2019 2710
Required Semi-Annual Sampling Wells '. ,
MW-12 (Class III) Uranium (ug/L) 23.5 4/25/2019 23.2 NS NA NS NA 7/11/2019 23.1 NS NA NS NA 10/23/2019 21.6 NS NA NS NA Selenium (ug/L) 39 33.9 NA 30.3
MW-24 (Class III)
Beryllium (ug/L) 2
5/2/2019
2.83
NS
NA
NS
NA
7/18/2019
2.94
NS
NA
NS
NA
11/6/2019
3.25
NS
NA
NS
NA
Cadmium (ug/L) 6.43 8.24 NA NA 8.37 NA NA 9.31 NA NA
Fluoride (mg/L) 0.47 0.839 NA NA 0.996 NA NA 0.667 NA NA
Nickel (mg/L) 50 63.9 NA NA 70.6 NA NA 75.4 NA NA
Manganese (ug/L) 7507 7020 NA NA NA NA NA 7700 NA NA
Thallium (ug/L) 2.01 2.73 NA NA 2.61 NA NA 2.88 NA NA
Sulfate (mg/L) 2903 2790 NA NA NA NA NA 2630 NA NA
Field pH (S.U.) 5.03 - 8.5 4.53 NA NA 5.03 NA NA 5.19 NA NA
MW-27 (Class III) Nitrate + Nitrite (as N) (mg/L) 5.6 4/23/2019 6.33 NS NA NS NA 7/12/2019
8/15/2019 6.50 NS
,
NA NS NA 10/22/2019 6.27 NS NA NS NA
MW-28 (Class III)
Chloride (mg/L) 105
4/24/2019
165
NS
NA
NS
NA
7/12/2019
8/16/2019
133
NS
NA
NS
NA
10/22/2019
149
NS
NA
NS
NA
Selenium (ug/L) 11.1 12.4 NA NA 10.6 NA NA 16.5 NA NA
Nitrate + Nitrite (as N) (mg/L) 5 3.7 NA NA NA NA NA 5.14 NA NA
Gross Alpha (pCi/L) 2.42 1.94 NA NA 1.20 NA NA <1.00 NA NA
Uranium (ug/L) 4.9 9.60 NA NA 7.83 NA NA 12.4 NA NA
MW-32 (Class III) Chloride (mg/L) 35.39 4/9/2019 34.5 NS NA NS NA 8/15/2019 35.7 NS NA NS NA 10/8/2019 35.3 NS NA NS NA
MW-35 (Class 11) Nitrogen, Ammonia as N 0.14 4/18/2019 0.0634 NS NA NS NA 7/11/2019 0.0935 NS NA NS NA 10/8/2019 <0.0500 NS NA NS NA
Notes:
NS= Not Required and Not Sampled
NA= Not Applicable
Exceedances are shown in yellow
Table 1 - GWCL Exceedances for Second Quarter 2020 under the March 19, 2019 GWDP
Q1 2020 Results Q1 2020 Results
Monitoring Well
(Water Class) Constituent Exceeding GWCL GWCL in March
19, 2019 GWDP
Ql 2020
Sample Date
Ql 2020
Result
February
2020
Monthly
Sample Date
February
2020
Monthly
Result
March 2020
Monthly
Sample Date
March
2020
Monthly
Result
Q2 2020
Sample Date
Q2 2020
Result
May 2020
Monthly
Sample Date
May 2020
Monthly
Result
June 2020
Monthly
Sample Date
June 2020
Monthly
Result
Required Quarterly Sampling Wells
MW-1 1 (Class II)
Chloride (mg/L) 39.16 1/15/2020
1/28/2020
38.9
2/4/2020
42.1
3/10/2020
41.0
4/8/2020
38.3
5/5/2020
39.0
6/2/2020
40.1
Sulfate (mg/L) 1309 1180 1260 1120 1180 1180 1310
Manganese (ug/L) 164.67 169 227 183 189 206 211
MW-14 (Class III) Fluoride (mg/L) 0.22 1/15/2020 0.128 2/4/2020 0.145 3/10/2020 <0.100 4/6/2020 <0.100 5/5/2020 <0.100 6/2/2020 <0.100
Sulfate (mg/L) 2330 2250 2190 2150 2290 2150 2260
MW-25 (Class III) Cadmium (ug/L) 1.5 1/15/2020 1.35 2/5/2020 1.52 3/11/2020 1.41 4/7/2020 1.46 5/6/2020 1.52 6/3/2020 1.46
MW-26 (Class III)
Nitrate + Nitrite (as N) (mg/L) 0.62
1/15/2020
0.873
2/4/2020
0.978
3/10/2020
1.60
4/8/2020
0.747
5/6/2020
1.16
6/3/2020
3.44
Chloroform (ug/L) 70 1260 1640 1720 1420 1200 1530
Chloride (mg/L) 58.31 78.8 66.9 76.9 62.8 73.8 63.7
Methylene Chloride (ug/L) 5 2.79 2.76 4.44 1.94 1.48 2.35
MW-30 (Class II)
Nitrate + Nitrite (as N) (mg/L) 2.5
1/15/2020
16.4
2/5/2020
17.8
3/11/2020
19.0
4/6/2020
18.1
5/6/2020
18.6
6/3/2020
18.3
Chloride (mg/L) 128 182 187 182 195 177 180
Selenium (ug/L) 47.2 49.7 49.9 48.1 54.4 51.5 50.5
Uranium (ug/L) 8.32 8.88 9.06 9.50 9.24 8.94 9.28
MW-31 (Class III)
Nitrate + Nitrite (as N) (mg/L) 5
1/14/2020
17.5
2/4/2020
18.0
3/10/2020
19.2
4/6/2020
18.8
5/5/2020
20.1
6/2/2020
18.7
Sulfate (mg/L) 993 1120 1150 1080 1130 1080 1130
TDS (mg/L) 2132 2220 2240 2380 2400 2330 2440
Uranium (ug/L) 15 14.8 NA NA 15.5 NA NA
Chloride (mg/L) 143 381 370 368 376 361 377
MW-36 (Class III) Sulfate (mg/L) 3146.21 1/14/2020 2660 2/5/2020 2540 3/10/2020 2890 4/9/2020 2660 5/5/2020 2480 6/2/2020 2770
Required Semi-Annual Sampl ng Wells
MW-12 (Class III) Uranium (ug/L) 23.5 1/16/2020 21.9 NS NA NS NA 4/9/2020 23.7 NS NA NS NA , Selenium (ug/L) 39 NA 41.2
MW-24 (Class III)
Beryllium (ug/L) 1
1/22/2020
2.07
NS
NA
NS
NA
4/22/2020
2.95
NS
NA
NS
NA
Cadmium (ug/L) 6.43 7.30 NA NA 8.46 NA NA
Fluoride (mg/L) 0.47 0.805 NA NA 0.732 NA NA
Nickel (mg/L) 50 68.1 NA NA 72.6 NA NA
Manganese (ug/L) 7507 7010 NA NA 7750 NA NA
Thallium (ug/L) 2.01 1.92 NA NA 2.81 NA NA
Sulfate (mg/L) 2903 2960 NA NA 2870 NA NA
Field pH (S.U.) 5.03 - 8.5 6.01 NA NA 5.60 NA NA
MW-27 (Class III) Nitrate + Nitrite (as N) (mg/L) 5.6 1/16/2020 6.18 NS NA NS NA 4/8/2020 6.43 NS NA NS NA
MW-28 (Class III)
Chloride (mg/L) 105
1/16/2020
151
NS
NA
NS
NA
4/15/2020
129
NS
NA
NS
NA
Selenium (ug/L) 11.1 13.4 NA NA 10.2 NA NA
Nitrate + Nitrite (as N) (mg/L) 5 NA NA NA 2.6 NA NA
Gross Alpha (pCi/L) 2.42 1.79 NA NA 1.69 NA NA
Uranium (ug/L) 4.9 7.56 NA NA 5.91 NA NA
MW-32 (Class III) Chloride (mg/L) 35.39 1/14/2020 38.0 NS NA NS NA 4/7/2020 36.4 NS NA NS NA
MW-35 (Class 11) Nitrogen, Ammonia as N 0.14 1/16/2020 0.0919 NS NA NS NA 4/9/2020 0.0772 NS NA NS NA
Notes:
NS= Not Required and Not Sampled
NA= Not Applicable
Exceedances are shown in yellow