DRC-2023-070714 - 0901a0688126067d

State of Utah
SPENCER J. COX
Governor
DEIDRE HENDERSON
lieutenant Governor
TO: Phil Goble
Department of
Environmental Quality
Kimberly D. Shelley
Executive Director
DIVISION OF WASTE MANAGEMENT
AND RADIATION CONTROL
PIU
Douglas J. Hansen
Director
MEMORANDUM
FROM: Dean Henderson
¼h(J7,s
6 f;2--/'J-oz??
DATE: June 12, 2023
SUBJECT: Review of the February 20, 2023 4th Quarter, 2022 Chloroform Monitoring Report for
the Chloroform Contamination Investigation, Energy Fuels Resources (USA) Inc.
("EFRI") White Mesa Uranium Mill ("Mill"), near Blanding, Utah.
The Utah Division of Waste Management and Radiation Control ("Division") has reviewed the February
20, 2023 , 4th Quarter, 2022 Chloroform Monitoring Report ("Report") for the Chloroform
Contamination Investigation. For the review of this report the following regulatory enforcement
documents were used:
• EFRI issued Ground Water Quality Discharge Permit No. UGW370004 ("Permit"). Permit
version that was signed on March 19, 2019.
• The EFRI Quality Assurance Plan ("QAP") September 10, 2019 (Revision. 7 .6)
• The EFRI Groundwater Corrective Action Plan ("GCAP") September 14, 2015 (Revision 0)
• Utah Stipulation and Consent Order Docket Number UGW20-01 , September 16, 2015 .
REVIEW
GCAP Part 111.C requires the 4th Quarter Report to be submitted to the Division on or before March 1,
of each year. The Report was received by the Division on February 28, 2023 (date of Report
February 20, 2023) which meets the GCAP requirement.
Monitor and Pumping Well Sampling
The following 43 monitor wells were sampled as required in the GCAP (see Table 1 below):
15 pumping wells: MW-4, MW-26, TW4-1 , TW4-2, TW4-4, TW4-11 , TW4-19, TW4-21 , TW4-22,
TW4-24, TW4-25, TW4-37, TW4-39, TW4-40, and TW4-41.
DRC-20 195 North 1950 West• Salt Lake City, UT
Mailing Address: P.O. Box 144880 • Salt Lake City, UT 8411 4-4880
Telephone (801 ) 536-0200 • Fax [phone] • T.D.D. [phone]
www.deq.11tah.gov
Printed on I 00% recycled paper
DRC-2023-070714
Page 2
. Current 5 performance monitoring ("PM") wells: TW4-7, TW4-10, TW4-16, TW4-26, and TW4-29.
Current 23 compliance monitoring ("CM") wells MW-32, TW4-3, TW4-5, TW4-6, TW4-8, TW4-9,
TW4-12, TW4-13, TW4-14, TW4-18, TW4-23, TW4-27, TW4-28, TW4-30, TW4-31, TW4-32, TW4-
33, TW4-34, TW4-35, TW4-36, TW4-38, TW4-42, and TW4-43.
The water samples for the above wells were analyzed for the following constituents as required in the
QAP:
Chloroform
Chloromethane
Carbon tetrachloride
Chloride
Methylene chloride
Nitrate + Nitrite as Nitrogen.
The analytical methods used is consistent with the requirements of the GCAP. For a summary of the 4th
Quarter, 2022 and historic analytical results see Table 1 below.
Groundwater Head Monitoring
Depth to groundwater was measured in the following wells and/or piezometers, as required in Part I.E.3
of the Permit:
• The quarterly groundwater compliance monitoring wells.
• Existing monitoring well MW-4 and all of the temporary chloroform investigation wells.
• Piezometers P-1, P-2, P-3A, P-4 and P-5.
• MW-20 and MW-22.
• Nitrate monitoring wells.
• The DR piezometers which were installed during the Southwest Hydrologic Investigation.
In addition, weekly and monthly depth to groundwater measurements were taken in pumping wells
MW-4, MW-26, TW4-l, TW4-2, TW4-4, TW4-11, TW4-19, TW4-21, TW4-22, TW4-24, TW4-25,
TW4-37, TW4-39, TW4-40, TW4-41, TW4-42, and TWN-2.
The monitoring wells were purged using the three approved QAP well purging strategies and meet QAP
requirements for each strategy:
1. Purging two casing volumes with stable field parameters for specific conductivity,
turbidity, pH, redox potential, and water temperature (within 10% RPD):
Wells: MW-32, TW4-5, TW4-8, TW4-9, TW4-16, TW4-18, TW4-23, TW4-32, and TW4-38.
2. Purging a well to dryness and stability of field parameters for pH, specific conductivity, and
water temperature only after recovery:
Wells: TW4-3, TW4-6, TW4-7, TW4-10, TW4-12, TW4-13, TW4-14, TW4-26, TW4-27,
TW4-28, TW4-29, TW4-30, TW4-31, TW4-33, TW4-34, TW4-35, TW4-36, TW4-42, TW4-43.
3. The pumping wells are continuously pumped on a set schedule and are sufficiently purged to
collect a sample
Page 3
Pumping Wells: MW-4, MW-26, TW4-l, TW4-2, TW4-4, TW4-l 1, TW4-19,
TW4-21, TW4-22, TW4-24, TW4-25, TW4-37, TW4-39, TW4-40, and TW4-41.
Holding Times
The water samples method holding times for each parameter for samples collected at each monitor well
were received and analyzed within the required holding times stated in the QAP.
Receipt Temperature
Water samples were received within the required QAP temperature limit of 6° C.
Analytical Methods
The analytical methods reported to be use by the laboratory to analyze Chloroform, Chloride,
Chloromethane, Methylene chloride, Carbon tetrachloride, and Nitrate+ Nitrite as Nitrogen are
incompliance with analytical methods required in the Chloroform QAP.
Detection Limits
Analyses were measured and reported to the required reporting limits. However, several sets of sample
results had the reporting limit raised for at least one analyte due to matrix interference and/or sample
dilution. In all cases the reported value for the analyte was higher than the increased detection limit.
EFR Duplicate Sample Comparison
Three duplicate samples were collected. Monitor well TW4-12 and its duplicate sample TW4-65, and
TW4-9 and its duplicate sample TW4-70; and TW4-18 and its duplicate sample TW4-75. All analytical
results for the three sample/duplicate pairs were within the 20% relative percent difference (RPD)
acceptance limits except for nitrate in TW4-12 and chloride in TW4-9. Nitrate concentrations at TW4-
12 is 4.68 mg/Land its duplicate TW4-65 is 7.02 mg/L (RPD of 40%) are below the nitrate GWQS of
10 mg/L (see Table 2 below). Chloride concentrations at TW4-9 is 33.2 mg/L and its duplicate TW4-70
is 58.5 mg/L (RPD of 55.2%) and has no GWQS (see Table 2 below). Because the nitrate
concentrations are below the GWQS and both nitrate and chloride concentrations are within historic
concentrations it is recommended that no resampling be required.
Mass Removed and Plume Residual Mass
Chloroform removal was first estimated from the 1st Quarter, 2007. Since that estimation the mass
removed by each pumping well for each quarter has been calculated. Estimated reported mass removed
during the 4th Quarter 2022 is 15 lbs. (see Table 3 below) which is greater than the estimated 12.3 lbs.
removed in the 3rd Quarter 2022. The greater mass removal is primarily due to an increase in the
concentrations in TW 4-19.
Using the "Chloroform Plume Mass Calculation Method" as described in Appendix A of the GCAP the
residual mass of chloroform within the plume is estimated as 893 lbs. in the 4th Quarter, 2022. This is
approximately 43 lbs. larger than the 3rd Quarter 2022 estimated mass of 850 lbs.
Page4
As per Part III.B.2 of the GCAP, the electronic files were used in 4th Quarter, 2022 to calculate the mass
estimates. The following files were used to calculate the estimated chloroform mass within the
chloroform plume:
• Excel spreadsheet that included: well name; well location ( easting and northing); Laboratory
reported concentration in µg/1 in the 4th Quarter, 2022 and corresponding log equivalent values.
• Surfer® griding parameters: kriging parameters: SURFER TM default parameters (point kriging,
linear variogram, slope = 1, no anisotropy [ anisotropy = 1], no search constraints; min x, max x
(UTME[m]): 631900, 633043; min y, max y (UTME[m]): 4154240, 4155550.64; grid spacing in
x, y (m): 15.24, 15.24
• Surfer chloroform concentration grid file.
• Concentration GE 70 Grid file
• Intermediate Surfer Grid Files: water level grid; aquifer base grid; saturated thickness grid
Based on the review of these files it appears that the date entered and generated is appropriate to
calculate an estimated chloroform mass within the chloroform plume and EFRI followed Part III.B.2 and
Appendix A of the GCAP.
Reporting
The Report included the following information as required in the QAP:
a) Introduction
b) Sampling and Monitoring Plan
-Description of monitor wells
-Description of sampling methodology, equipment and decontamination procedures
-Identify all quality assurance samples, e.g. trip blanks, equipment blanks,
duplicate samples
c) Data Interpretation
-Interpretation of groundwater levels, gradients, and flow directions.
Interpretations will include a discussion on: 1) A current site groundwater
contour map, 2) hydrographs to show groundwater elevation in each
monitor well over time, 3) depth to groundwater measured and
groundwater elevation from each monitor well summarized in a data table,
that includes historic groundwater level data for each well, and 4) an
evaluation of the effectiveness of hydraulic capture of all contaminants of
concern.
-Interpretation of all analytical results for each well, including a discussion
On: 1) a current chloroform isoconcentration map with one of the
Isoconcentration lines showing the 70 µg/L boundary, 2) graphs showing
Chloroform concentration trends in each well through time and, 3)
Analytical results for each well summarized in a data table that includes
Historic analytical results for each well.
-Calculate chloroform mass removed by pumping wells. Calculations
would include: 1) total historic chloroform mass removed, 2) total historic
chloroform mass removed for each pumping well, 3) total chloroform
mass removed for the quarter and, 4) total chloroform mass removed from
each pumping well for the quarter, 5) estimated residual mass of chloroform within the
plume.
Page 5
d) Conclusions and Recommendations
e) Electronic copy of all laboratory results for Chloroform Investigation monitoring conducted
during the quarter.
f) Copies ofDUSA field records, laboratory reports and chain of custody forms.
Evaluation of the Chloroform Contaminate Plume and Its Associated Contaminants
Bounding Chloroform Plume
Groundwater monitoring data up to the 4th Quarter, 2022 monitoring event appeared to show that the
chloroform contaminate plume ("Plume") and associated contaminants ( carbon tetrachloride,
chloromethane, and methylene chloride) is bound by up gradient, cross gradient, and down gradient
compliance monitoring wells that have a chloroform concentration of <70 µg/L ("GWQS = 70 µg/L).
Performance Monitor Wells {"PM") [Wells Exceeding Chloroform Concentrations GWOS of 70µg/L]
Five (5) PM wells still exceed 70 µg/L: TW4-7, TW4-10, TW4-16, TW4-26, and TW4-29.
Compliance Monitor Wells {"CM") [Wells with Chloroform Concentrations between< 1 and 70µg/L]
Nine (8) CM wells range with detectable chloroform concentration but still below 70µg/L: TW4-5,
TW4-6, TW4-8, TW4-9, TW4-18, TW4-27, TW4-30, and TW4-33.
CM Wells Below the Laboratory Chloroform Detection Limit ( < l. 0 µg/L)
Fifteen (15) CM wells were below the laboratory detection limit for chloroform (<1.0 µg/L): MW-32,
TW4-3, TW4-12, TW4-13, TW4-14, TW4-23, TW4-28, TW4-31, TW4-32, TW4-34, TW4-35, TW4-
36, TW4-38, TW4-42, and TW4-43.
Pumping Wells
There are 15 pumping wells in full operation in the 4th Quarter, 2022, 14 pumping wells MW-4, MW-
26, TW4-1, TW4-2, TW4-4, TW4-ll, TW4-19, TW4-21 TW4-22, TW4-24, TW4-37, TW4-39, TW4-
40, and TW4-41 exceed chloroform concentrations of 70 µg/L. Pumping well TW4-25 had a non-
detectable (<1.0 µg/L) chloroform concentration (see table 1 below).
Nitrate, Nitrate + Nitrite {"nitrate") Concentrations
Pumping wells TW4-22 (45.0 mg/L), TW4-24 (35.0 mg/L) and TW4-26 (10.4 mg/L) exceed the nitrate
GWQS of 10 mg/L. These nitrate exceedances appear to be a result of the nitrate contaminant plume
up-gradient of the chloroform contaminant plume. This nitrate contaminant plume is being addressed
under the Nitrate Corrective Action Plan, approved on December 12, 2012.
Well TW4-27 (18.l mg/L) continue to exceed the nitrate GWQS of 10 mg/1. The source of nitrate may
be from the chloroform source plume. Wells TW4-29, TW4-30, and TW4-31 located approximately
200 feet down and/or cross gradient ofTW4-27 have nitrate concentrations in the 4th quarter 2022
below the nitrate GWQS of2.69 mg/L, 2.67 mg/L, and 0.41 mg/L respectively. Therefore, at this time
no action is recommended. However, should future nitrate concentrations in these three down and/or
cross gradient wells increases to above 10 mg/L or shows an increasing trend an additional investigation
may be recommended.
Page 6
Well TW4-28 (16.6 mg/L) exceed the nitrate GWQS of 10 mg/1. The source of nitrate may be from the
chloroform source plume. Well, TW4-32 located approximately 200 feet down gradient of TW4-28 has
a nitrate concentration in the 4th quarter 2022 below the nitrate GWQS of 1.68 mg/L. Therefore, at this
time no action is recommended. However, should future nitrate concentrations in down gradient well
TW4-32 increases to above 10 mg/Lor shows an increasing trend an additional investigation may be
recommended.
Conclusions on Compliance with the Permit and QAP
Per the Division review it appears that the Report complies with Permit, QAP, and GCAP. Therefore, a
letter will be drafted notifying EFRI of the review and closing out of for the February 20, 2022, 4th
Quarter, 2022 Chloroform Monitoring Report for the chloroform contamination investigation.
Page 7
References
EFRI, State of Utah Stipulated and Consent Order ("SCO") Docket Number UGW-20-01 White
Mesa Mill-Energy Fuels Resources (USA) Inc. ("EFRI") Plan and Time Schedule, Revision 1,
Pursuant to Part II.H.2 of the Groundwater Corrective Action Plan ("GCAP") included as
Attachment 1 to the SCO, January 10, 2018.
EFRI Quality Assurance Plan ("QAP") June 23, 2018 (Revision. 7.4)
EFRI issued Ground Water Quality Discharge Permit No. UGW370004. Permit version that was
signed on March 19, 2019.
EFRI, White Mesa Uranium Mill Chloroform Monitoring Report 4th (October through
December) 2022. (DRC-2023-001893)
Page 8
Tables 1 through 3
MW-4 (chlofoform pumping well
1tanedpumping3/4/03)
Sampling Event
TABLE 1 (1 of 33)
Historic Summary Of Monitoring Well Analytical Results Up To The 4th Quarter 2022
Chloroform Contamination Investigation
OUSA White Mesa Mill
Parameter
IGWQSl
Carbon Tetrachloride Chloroform Chloromethane Methylene Chloride Chloride
(5 UQ/Ll (70 uQ/Ll 130 ua/Ll 15 ua/Ll No GWQS (ma/LI
1stQtr 3/16/2005 NA 2,900 NA NA
2nd Qtr 5/25/2005 NA 3,170 NA NA
3rdQtr 8/31/2005 <10 3,500 <10 <10
4thQtr 12/7/2005 <50 3 000 <50 <50
1stQtr 3/9/2006 <50 3,100 <50 <50
2nd Qtr 6/14/2006 <50 3,000 <50 <50
3rdQtr 7/20/2006 <50 2,820 <50 <50
4th Qtr 11/8/2006 2.1 2 830 1.4 <1.0
1stQtr 2/28/2007 1.6 2,300 <1.0 <1.0
2nd Qtr 6127/2007 1.8 2,000 <1.0 <1.0
3rdQtr 8/15/2007 1.9 2,600 <1.0 <1.0
4thQtr 10/10/2007 1.7 2 300 <1.0 <1.0
1stQtr 3/28/2008 1.7 :i',400 <1.0 <1.0
2nd Qtr 6/25/2008 1.8 2,500 <1.0 <1.0
3rd Qtr 9/10/2008 1.8 1,800 <1.0 <1.0
4th Qtr 10/15/2008 1.7 2 100 <1.0 <1.0
1st Ctr 3/4/2009 1.5 2,200 <1.0 <1 .0
2ndQtr 6/23/2009 1.3 1,800 <1.0 <1 .0
3rd Qtr 9/14/2009 1.4 2,000 <1.0 <1 .0
4th Qtr 12114/2009 1.6 1800 <1.0 <1 .0
1stQtr 211112010· 1.2 1,600 <1.0 <1.0
2ndQtr 6/14/2010 1.2 2,100 <1.0 <1.0
3rd Qtr 8/6/2010 1.5 1,900 <1.0 <1.0
4th Qtr 10/15/2010 1.4 1500 <1.0 <1.0
1stQtr 2/23/2011 1.5 1,700 <1.0 <1.0
2ndQtr 6/1/2011 1.4 1,700 <1.0 <1.0
3rd Qtr 8/17/2011 1.1 1,700 <1.0 <1.0
4th Qtr 11/16/2011 1.3 1600 <1.0 <1.0
lsfCiii'lll 112312012 1 1,500 <1.0 <1.0
2nd at,-----6/612012 1.2 ---,::ioo <1.0 ______ <1.0 ____
3rd Qtr 9/4/2012 1.5 1,500 <1.0 <1.0
4thQtr 10/4/2012 1 1.,300 <1.0 <1.0
1stQtr 2111/2013 1.48 1,670 <1.0 <1.0
2ndQtr 6/5/2013 1.31 1,490 <1.0 <1.0
3rdQtr 9/3/2013 1.13 1,520 <1.0 <1.0
4th Qtr 10/29/2013 5.58 1 410 <1.0 <1.0
1stQtr 1/27/2014 4.15 1,390 <1.0 <1.0
2nd Qtr 5/19/2014 5.21 1,390 <1.0 <1.0
3rdQtr 8/11/2014 7.6 1,490 <1.0 <1.0
4th Qtr 10/21/2014 <1.0 <1.0 ___ Jt~ <1.:Q.. ______
1st Qtr (2) 3/9/2015 1.26 1,400 <1.0 <1.0 --------
2nd Qtr 6/8/2015 <1.0 1,300 <1.0
3rd Qtr 8/31/2015 <1.0 1,200
4th Qtr 10/19/2015 <1 .0 1 200 <1.0
1stQtr 3/9/2016 <1.0 1,240 <1.0
2nd Qtr 5/23/2016 1.44 1,580 <1.0
3rdQtr 7/25/2016 <1 .0 1,430 <1.0
4th Qtr 10/12/2016 1.24 1 470 <1.0
1stQtr 3/8/2017 1.22 1,450 <1.0
2ndQtr 6/13/2017 1.15 1,430 <1.0
3rdQtr 7126/2017 1.15 1,400 <1.0
4thQtr 10/11/2017 <1.0 1,320 <1.0
OWMRC. solit samole <19 1 400 <30
1stQtr 3/1212018 1.07 1,320 <1.0
2nd Qtr 6/8/2018 <1.0 1,240 <1.0
3rd Qtr 8/22/2018 <1.0 1,300 <1.0
4th Qtr 11/28/2018 <1 .0 1 330 <1.0
1stQtr 3/8/2019 <1 .0 1,190 <1 .0
2ndQtr 6/5/2019 <1.0 1,300 <1.0
3rd Qtr 9/4/2019 <1.0 1,180 <1.0
4thQtr 12/10/2019 <1.0 1 370 <1.0
1stQtr 2/19/2020 <1 .0 1,230 <1 .0
2ndQtr 5/27/2020 <1 .0 1,250 <1.0
3rd Qtr 9/4/2020 <1.0 1,240 <1.0
4thQtr 10/18/2020 <1.0 1 050 <1 .0
1stQtr 2/23/2021 <1 .0 1,150 <1.0
2ndQtr 6/9/2021 <1.0 1,320 <1.0
3rd Qtr 8/24/2021 <1.0 1,140 <1 .0
4thQtr 1211/2021 <1.0 1100 <1 .0
1stQtr 3/9/2022 -<To 1,040 <1 .0
2ndQtr 6/8/2022 <1.0 1,010 <1.0
3rdQtr 8/30/2022 <1.0 1,200 <1.0
4th Qtr 11/30/2022 <1.0 1170 <1.0
O,V4•AI
1statr 3/16/2005 NA 3,700 NA
2ndQtr 5/25/2005 NA 3,740 NA
3rd Qtr 8/31/2005 <10 3,800 <10
4thQtr 12/7/2005 <50 3 000 <50
1stQtr 3/9/2006 <50 3,700 <50
2ndQtr 6/14/2006 <50 3,300 <50
3rd Qtr 7/20/2006 <50 3,190 <50
4thQtr 11/8/2006 2.4 3 370 <1.0
1stQtr 2/28/2007 fg 2,500 <1.0
(1) As of March 2012 both north and south wild Ide ponds no longer receiving water
(2) chloroform pumping wells TW4-1, TW4-2, and TW4-11 started in 1/14/15 -•
NA= not analyzed
Shaded indicates concentrations exceeding GWQS.
Bold and rta~cs indicates the MDL exceeded the GWQS.
J = ApproX1mated value
<1.0
1.42 <1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
70 J
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
NA
NA
<10
<50
<50
<50
<50
<1.0
<1.0
Well abandonded
NA
NA
NA
53
49
49
48
50
47
45
47
45
42
42
35
45
37
34
43
44
45
41
38
41
40
35
41
40
41 .0
39.0
41.0
41 .0
37.8
44.0
41.4
40.1
38.5
39.9
41.0
41.5
40.7
43.1
44.3
40.8
42.2
43.7
42.5
44.8
43.3
44.0
43.8
43.8
43.0
46.2
43.5
48.5
43.1
41 .5
40.6
41 .9
45.5
48.1
40.7
43.8
41.4
46.5
34.8
43.2
47.6
40.9
43.7
44.7
35.9
NA
NA
NA
55 53
54
54
54
60
Nitrate, Nitrate + Nitrite
I10mn/Ll
6.3
7.1
7.0
7.0
6.0
6.0
1.2
6.4
6.3
7.0
6.2
6.2
5.8
6.1
6.4
5.9
5.7
5.2
5.3
5.8
4.0
5.1
4.8
4.9
4.6
4.9
4.9
5.1 ___________ j .8
4.9
5.0
4.8
4.78
4.22
4.89
5.25
4.7
4.08
3.7
----------5Jl~ 5.75
2.53
4.79
4.43
5.15
4.54
4.95
4.88
4.99
4.88
4.59
5.25
5.1
4.47
4.64
4.55
4.44
5.05
5.16
4.69
4.34
6.22
5.04
4.93
4.62
4.6i'
6.48
3.83
4.90
4.80
3.90
4.20
4.05
7.1
7.8
6.9
6.7
58
7.3
1.2
7.1
7.1
TABLE 1 (2 of 33)
Historic Summary Of Monitoring Well Analytical Results Up To The 4th Quarter 2022
Chloroform Contamination Investigation
DUSA White Mesa Mill
MW-26 (fo11T1er TW4-15) Chlofof0<m
jltUTll)tllllweH,tarted8/&/03
Sampling Event
Carbon Tetrachloride Chloroform Chloromethane
I5ua/U 170 uo/U 130 un/L\
1stQtr 3/16/2005 NA 310 NA
2nd Qtr 5/25/2005 NA 442 NA
3rd Qtr 8/31/2005 <5.0 960 5.4
4th Qtr 12/7/2005 <50 1 000 <50
1stQtr 3/9/2006 <50 1,100 <50
2nd Qtr 6/14/2006 <50 830 <50
3rd Qtr 7/20/2006 <50 2,170 <50
4thQtr 11/8/2006 <1.0 282 <1.0
1stQtr 212812007 ·<io 570 <1.0
2ndQtr 6/27/2007 <1.0 300 <1.0
3rdQtr 8/15/2007 <1.0 1,400 <1.0
4thQtr 10/10/2007 <1.0 2 000 <1.0
1stQtr 3/28/2008 <1.0 930 <1.0
2ndQtr 6/25/2008 <1.0 1,300 <1.0
3rd Qtr 9/10/2008 <1.0 630 <1.0
4th Otr 10/15/2008 NA NA NA
11/18/2008 <2.0 1 700 <2.0
1stQtr 3/4/2009 <1.0 950 <1.0
2ndQtr 6/23/2009 <1.0 410 <1.0
3rd Qtr 9/14/2009 <1.0 850 <1.0
4thQtr 12/14/2009 <1.0 1100 <1.0
1stOtr 2/17/2010 <1.0 730 <1.0
2ndQtr 6/14/2010 1.2 1,600 <1.0
3rd Qtr 8/16/2010 <1.0 2,200 <1.0
4th Qtr 10/15/2010 <1.0 970 <1.0
1stQtr 2/23/2011 <1.0 450 <1.0
2ndOtr 5/31/2011 <1.0 1,800 <1.0
3rd Qtr 8/17/2011 <1.0 720 <1.0
4thQtr 11/16/2011 NA NA NA
1,101,·iW ~~~~;~~~~ <1.0 1800 <1.0
<1.0 2,400 <1.0
2nd Qtr ----6/6/2012 <1.0 --------1:000 <1.0 ______
3rd Qtr 9/4/2012 <1 3,100 <1
4th Qtr 10/4/2012 <1 1 200 <1
1stQtr 2/11/201 3 <1 2,120 <1
2nd Qtr 6/5/2013 <1.0 4,030 <1.0
3rd Otr 9/3/201 3 <1.0 2,940 <1.0
4thQtr 10/29/2013 <1.0 1 410 <1
1stOtr 1/2712014 . <1.0 1,400 <1.0
2nd Qtr 5/19/2014 <1.0 1,960 <1.0
3rd Qtr 8/11/2014 <1.0 2,120 8.7
4th Qtr 10/21/201 4 <1.0 2,090 <1.0
tstQtr 31912o·i's . <1.0 1,980 <1.0
2nd Qtr (3) 6/8/2015 <1.0 ___ J~~ <!Q.. ______
3rd Qtr ---8/31/2015 <1.0 --------2,350 4.05
4th Otr 10/1 9/2015 <1.0 2 680 1.32
1stOtr 3/9/2016 <1.0 2,650 <1.0
2ndQtr 5/23/2016 <1.0 2,220 <1.0
3rd Qtr 7/25/2016 <1.0 3,190 <1.0
4th Qtr(4) 10/12/2016 <1.0 2,510 <1.0
1st Qtr -----3/8/2017 <1.0 --------,190 <1.0 ______
2ndOtr 6/13/2017 <1.0 2,450 <1.0
3rd Qtr 7/26/2017 <1.0 1,230 <1.0
4th Qtr 10/11/2017 <1.0 2 570 <1.0
1st Qtr 3/12/2018 <1.0 1,210 <1.0
2nd Qtr 6/8/2018 <1.0 1,870 <1.0
3rd Qtr 8/22/2018 <1.0 1,680 <1.0
4th Qtr 11/28/2018 <1.0 1 480 <1.0
1stOtr 31812019 <1.0 1.ii'o <1.0
2nd Otr 6/5/2019 <1.0 1,280 <1.0
3rd Qtr 9/4/2019 <1.0 1,680 <1.0
4thOtr 12/10/2019 <1.0 1 390 <1.0
1sIQtr 2/19/2020 <To 1,100 <1.0
2ndQtr 6/12/2020 <1.0 1,140 <1.0
3rd Qlr 9/4/2020 <1.0 1,130 <1.0
4th Qtr 10/28/2020 <1.0 866 <1.0
1stOtr 2/23/2021 <1.0 3,060 <1.0
2nd Otr 6/6/2021 <1.0 998 <1.0
3rd Qtr 8/24/2021 <1.0 1,580 <1.0
4th Qtr 12/1/2021 <1.0 826
1s!Qtr 3/9/2022 <1.0 1,030 <1.0
2ndQtr 6/8/2022 <1.0 611 <1.0
3rd Qtr 8/30/2022 <1.0 612 <1.0
4th Otr 11/30/2022 <1.0 1 040 <1.0
(1) voes were resampled because laboratory missed holding bme
(2) As of March 2012 both north and south wild hfe ponds no lo!!9er rec8Mna_ water
(J)chloroTorm.eumpm.2,we1i"T'w4.j1 started in fJ9Tf~ ----------· J4) chloroform pume,n,i wells TW4-1 lW4-2 and TW4-11 started In 1/14/15 _.
NA= not anatyzed
Shaded indicates concentrations exceeding GWQS.
Bold and rta~cs indicates the MDL exceeded the GWQS.
5.9
Parameter
IGWQSl
Methylene Chloride
15 ua/Ll
NA
NA
<5.0
<50
<50
<50
<50
2.6
5.5
13
36
14
40
53
24
NA
100
51
12
30
40
19
<1.0
21
6.5
3.6
1.3
7.2
NA
2.9 16 ---------21
31
4
9.34
52.4
33.2
4.03
13.8
15.4
26
23.2
27.4
11.2
11.6
8.28
4.66
4.57
7.81
4.31
7.65
7.59
5.26
7.83
2.14
9.19
<1 .0
<1 .0
2.2
1.19
1.93
1.78
<1.0
<1.0
2.57
<1.0
3.46
<1.0
<1.0
<1.0
<1 .0
<1 .0
<1 .0
<1.0
Chloride
No GWQS lma/Ll
NA
NA
NA
55
52
52
65
54
56
49
57
57
49
57
44
64
NA
49
48
46
60
57
40
49
65
57
88
58
69
NA 98
---------73
73
68
81.9
77.9
60.5
72.3
59.4
53.4
59
60.1
56.5
62
69.6
62.6
68.3
66.2
66.4
66.2
58.4
64.3
61.4
62.2
60.3
58.7
91.4
85.5
69.9
80.7
76.2
83.2
88.9
35.1
70
37.4
59.5
48.6
46.6
84.7
50.2
63.4
57.0
52.1
. Nitrate, Nitrate + Nitrite
110 ma/Ll
0.3
0.2
0.2
0.3
0.2
0.2
1.4
0.3
0.6
0.4
1
0.6
0.1
0.6
0.2
0.1
NA
0.4
0.2
0.1
2.3 62
6.8
0.6
0.7
0.5
0.4
0.9
2.0
NA ___________ ).7
2.5
2.6
1.8
2.27
2.11
1.18
1.38
0.55
0.93
0.7
0.93
0.73
----------M 2 0.68
0.991
t.45
1.12
1.57
----------us 0.768
0.922
1.56
t.t8
1.57
0.901
2.80
1.96
1.85
2.83
3.08
0.977
1.17
2.93
0.42
3.62
0.349
0.81
0.671
0.52
0.3
0.22
0.662
0.337
TABLE 1 (3 of 33)
Historic Summary Of Monitoring Well Analytical Results Up To The 4th Quarter 2022
Chloroform Contamination Investigation
DUSA White Mesa Mill
MW-32 (TomlerTW•-17)
Sampling Event
Parameter
IGWQS)
Carbon Tetrachloride
(5 ua/Ll
Chloroform
170 ua/Ll
Chloromethane
(30 un/LI
Methylene Chloride
15 ua/Ll
1st Qtr 3/16/2005 NA <1.0
2nd Qtr 5/25/2005 NA <1.0
3rdQtr 8/31/2005 <1.0 <1.0
4th Qtr 1217/2005 <1.0 <1.0
1stQtr 319/2006 <1.0 <1.0
2ndQtr 6/1412006 <1.0 <1.0
3rd Qtr 7120/2006 <1.0 <1.0
4th Qtr 1118/2006 <1.0 <1.0
NA
NA
<1.0
<1.0
1stQtr 2128/2007 <1.0 <1.0 <1.0
2ndQtr 612712007 <1.0 <1.0 <1.0
3rd Qtr 8/1512007 <1.0 <1.0 <1.0
4th Qtr 10/1012007 <1.0 <1.0 <1.0
1st Qtr 3/2812008 <1.0 <1.0 <1.0
2ndQtr 612512008 <1.0 <1.0 <1.0
3rd Qtr 9110/2008 <1.0 <1.0 <1.0
4th Qtr 1011512008 <1.0 <1.0 <1.0
1stQtr 31412009 <1.0 <1.0 <1.0
2nd Qtr 6/2312009 <1.0 <1.0 <1.0
3rdQtr 911412009 <1.0 <1.0 <1.0
4th Qtr 12/16/2009 <1.0 <1.0 <1.0
1st Qtr 2/17121i"i"ii <1.0 <1.0 <1.0
2nd Qtr 611412010 <1.0 <1.0 <1.0
3rdOtr 811612010 <1.0 <1.0 <1.0
4th Qtr 1011512010 <1.0 <1.0 <1.0
1stQtr 2/2312011 <1.0 <1.0 <1.0
2nd Qtr 5/2512011 <1.0 <1.0 <1.0
3rdOtr 811812011 <1.0 <1.0 <1.0
4th Qtr 11/1612011 NA NA NA
lsfOtriW ;~;~~:~ :: ~ :: ~ :: ~
NA
NA
3.2 <1.0
<1.0
<1.0
3.5 <1.0
1.8 <1.0
1.5 <1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
NA
<1.0
<1.0 2nd Qtr ---6122/2012 <1.0 ------<i':O ____ <i':O ______ <1.0 -------
3rdQtr 91512012 <1.0 <1.0 <1.0 <1.0
4th Qtr 1011012012 <1.0 <1.0 <1.0 <1.0
1stOtr 2/1112013 <1.0 <1.0 <1.0 <1.0
2ndQtr 611812013 <1.0 <1.0 <1.0 <1.0
3rdQtr 91312013 <1.0 <1.0 <1.0 <1.0
4th Qtr 10/2912013 <1.0 <1.0 <1.0 <1.0
1stQtr 1/2912014 <1.0 <1.0 <1.0 <1.0
2nd Qtr 512312014 <1.0 <1.0 <1.0 <1.0
3rdQtr 8/2612014 <1.0 <1.0 <1.0 <1.0
4th Qtr 1012912014 <1.0 <1.0 <1.0 <1.0
1stQtr 3/1712015 <1.0 <1.0 <1.0 <1.0
2nd Qtr 6/1112015 <1.0 <1.0 <1.0 <1.0
3rdQtr 91912015 <1.0 <1.0 <1.0 <1.0
4th Qtr 1012812015 <1.0 <1.0 <1.0 <1.0
1stQtr 3122/2016 <1.0 <1.0 <1.0 <1.0
DuplicateTW4-70 <1.0 <1.0 <1 .0 <1.0
Chloride
No GWQS lma/Ll
Nitrate, Nitrate + Nitrite
110 mo/LI
NA
NA
NA
<0.1
<0.1
<0.1
33 <0.1
32 <0.1
30 <0.1
32 <1.0
31 <.1
32 <1.0
32 <1.0
31 <1.0
32 <1.0
31 <.1
29 <1.0
30 <1.0
26 <0.05
30 <.1
31 <0.1
33 <0.1
;~ 1§-'-:--------1
32 <0.1
28 <0.1
24 <0.1
40 <0.1
31 <0.1
33 <0.1
32 <0.1
NA NA
21 <0.1
------32 <0.1 --
33 <0.1
35 <0.1
34.3 <0.1
34.9 <0.1
33 <0.1
35.7 <0.1
34 <0.1
39.7 <0.1
34 <0.1
34.9 <0.1
36.3 <0.1
35.8 <0.1
37.7 <0.1
34.7 <0.1
36.7 <0.1
37.7 0.119
2ndQtr 61812016 <1.0 <1.0 <1.0 <1.0 36.4 <0.1
DuplicateTW4-70 <1.0 <1.0 <1.0 <1.0 37.7 <0.1
3rd Qtr 8/1912016 <1.0 <1.0 <1.0 <1.0 35.7 <0.1
i~ g:; 1~;~;;~~;~ :; ~ :; ~ 11"'.~'----+:'"';'"'.~'----------1--------'i"'~'"•~+:-"~"-;'------------n
2ndQtr 612112017 <1.0 <1.0 <1.0 <1.0 37.2 <0.1
3rd Qtr 81812017 <1.0 <1.0 <1.0 <1.0 38.1 <0.1
i~ g~ 1~::fJ~:~ :: ~ :: ~ :: ~ :: ~ ;~: 1~"-:'-------------1
DuplicateTW4-70 <1.0 <1.0 <1.0 <1.0 39.3 <0.1
2ndQtr 611412018 <1 .0 <1.0 <1.0 <1.0 34.4 <0.1
3rdQtr 9/22/2018 <1.0 <1.0 <1.0 <1.0 41 .2 <0.1
4thQtr 10/29/2018 <1.0 <1.0 <1.0 <1.0 32.9 <0.1
1stQtr 3119/2019 <1 .0 <1.0 <1.0 <1.0 35.3 <0.1
2nd Qtr 611812019 <1.0 <1.0 <1.0 <1.0 36.5 <0.1
3rdOtr 9/11/2019 <1 .0 <1.0 <1.0 <1.0 41 .2 <0.1 i~ g:; ,~;:rJ~~~ :: ~ :: ~ :: ~ :: ~ 36:i~ :~~:~------...
OuplicateTW4-75 <1.0 <1.0 <1.0 <1.0 34.8 <0.1
2nd Qtr 6112/2020 <1.0 <1.0 <1.0 <1.0 35.6 <0.1
3rdQtr 911812020 <1.0 <1.0 <1.0 <1.0 34.7 <0.1
4th Qtr 111412020 <1.0 <1.0 <1.0 <1.0 31.3 <0.1
Q.~J!cate TW4-65 <1.0 <1.0 <1.0 <1.0 35.9 <0.1
1st Qtr 311812021 <1.0 <1.0 <1.0 <1.0 36.8 <0.1
OuplicateTW4-75 <1.0 <1.0 <1.0 <1.0 37.4 <0.1
2nd Qtr 6/1712021 <1.0 <1.0 <1.0 <1.0 35.8 <0.1
Duplicate TW4-75 <1.0 <1.0 <1.0 <1.0 34.3 <0.1
3rdQtr 912312021 <1.0 <1.0 <1.0 <1.0 35.3 <0.1
OuplicateTW4-75 <1.0 <1.0 <1.0 <1.0 35.5 <0.1 i~~ g:; !~;~~~~~ :: ~ :: ~ 1tg :: ~ ~~: 1i~:-----------I
2ndQtr 6/1612022 <1.0 <1.0 <1.0 <1.0 26.9 <0.1
3rdQtr 911512022 <1.0 <1.0 <1.0 <1.0 37.2 <0.1
4th Qtr 121812022 <1.0 <1.0 <1.0 <1.0 35.1 <0.1
(1) voes were resampled because laboratory missed holding time.
(2) As of March 2012 both north and south wild life ponds no longer recervmg water
NA= not analyzed
Shaded indicates concentrations exceeding GWQS.
TABLE 1 (4 of 33)
Historic Summary Of Monitoring Well Analytical Results Up To The 4th Quarter 2022
Chloroform Contamination Investigation
DUSA White Mesa Mill
TW4-1 (chlorolofm pumpng we11
a11nlld1111114115} Parameter
Sampling Event IGWQS)
Carbon Tetrachloride Chloroform Chloromethane Methylene Chloride
15 uo/LI 170 un/L\ 130 un/LI 15 ua/LI
1stQtr 3/16/2005 NA 2,700 NA NA
2ndQtr 5/25/2005 NA 3,080 NA NA
3rdQtr 8/31/2005 <10 2,900 <10 <10
4th Qtr 12n/2005 <50 2,400 <50 <50
1st Qtr 3/9/2006 <50 2,700 <50 <50
2nd Qtr 6/14/2006 <50 2,200 <50 <50
3rdQtr 7/20/2006 <50 2,840 <50 <50
4th Qtr 11/8/2006 1.4 2 260 <1.0 <1.0
1stQtr 2/28/2007 1.2 1,900 ·<fo <1.0
2nd Qtr 6/27/2007 1.4 1,900 <1.0 <1.0
3rdQtr 8/15/2007 1.3 2,300 <1.0 <1.0
4thQtr 10/10/2007 1.3 2 000 <1.0 <1.0
1st0tr 3/28/2008 1.3 2,000 <1.0 <1.0
2nd Qtr 6/25/2008 1.1 1,900 <1.0 <1.0
3rdQtr 9/10/2008 1.3 1.700 <1.0 <1.0
4thQtr 10/15/2008 1.3 1 700 <1.0 <1.0
1st Ctr 3/11/2009 1.1 1,700 <1.0 <1.0
2nd Qtr 6/23/2009 1 1,500 <1.0 <1.0
3rdQtr 9/14/2009 <1.0 1,700 <1.0 <1.0
4thQtr 12/29/2009 <1.0 1 400 <1.0 <1.0
1stQ1r 3/3/2010 <1.0 1,300 <1.0 <1.0
2nd Qtr 6/14/2010 1.2 1,600 <1.0 <1.0
3rdQtr 8/18/2010 1 1,600 <1.0 <1.0
4thQtr 10/15/2010 <1.0 1 500 <1.0 <1.0
1stQtr 2/24/2011 <1.0 1,300 <1.0 <1.0
2nd Q1r 6/1/2011 <1.0 1,200 <1.0 <1.0
3rd Qtr 8/18/201 1 <1 .0 1,300 <1.0 <1.0
4thQtr ........... 11/29/201 1 <1.0 1 500 <1.0 <1.0
'lsf0fr(2) 1/24/2012 <1.0 1,300 <1.0 <1.0
2nd Qtr ---6/14/2012 <1.0 --------,:ooo <1.0 ______ <1.0 --------
3rd Qtr 9/28/2012 <1.0 1,000 <1.0 <1.0
4th Qtr 10/4/2012 <1.0 1100 <1.0 <1.0
1stQtr 2/13/2013 3.66 1,320 <1.0 <1.0
2ndQtr 6/19/2013 <1.0 1,100 <1.0 <1.0
3rd Qtr 9/3/2013 <1.0 1,150 <1.0 <1.0
4thQtr 11/14/2013 <1.0 1 280 <1.0 <1.0
1statr 2/5/2014 5.47 1,090 <1.0 <1.0
2ndQtr 5/23/2014 4.77 1,020 <1 .0 <1.0
3rd Qtr 8/27/2014 <1.0 845 1.4 <1.0
4th Qtr ____ 10/29/2014 <1.0 ---------___ JJ.19 <l \!. ______
1st Qtr I2) 3/9/2015 <1.0 1,130 <1.0
2ndQtr 6/8/2015 <1.0 1,260 <1.0
3rd Qtr 8/31/2015 <1.0 1,060 <1.0
4th Qtr 10/19/2015 <1.0 1 040 <1.0
1st Qtr 3/9/2016 <1.0 974 <1 .0
2ndQtr 5/23/2016 <1.0 1,140 <1.0
3rd Qtr 7/25/2016 <1.0 1,160 <1.0
4th Qtr 10/13/2016 <1.0 1 330 <1.0
1stQtr 3/8/21i'i'i <1.0 519 <1.0
2ndQtr 6/13/2017 <1.0 977 <1.0
3rd Q1r 7/26/2017 <1.0 958 <1.0
4th Qtr 10/11/2017 <1.0 556 <1.0
<7.6 810 <12
<1.0 70.4 <1.0
2nd Qtr ----6/8/2018
~~rr~i9iif-·'~!!1P.'\nvwf8 <1.0 -------------942 <1.0 ______
3rd Qtr 8/22/2018 <1.0 1,010 <1.0
4th Qtr 10/22/2018 <1.0 752 <1.0
OWMRC.splitsamP.!e <5.0 210 <5.0
1stQtr 3/8/2019 <1.0 87.2 <1.0
2ndQtr 6/5/2019 <1.0 1,040 <1.0
3rd Qtr 9/4/2019 <1.0 894 <1.0
4th Qtr 12/10/2019 <1.0 1 070 <1.0
1st Qtr 2/19/2020 <1.0 1,190 <1.0
2ndQtr 5/27/2020 <1.0 499 <1.0
3rd Q1r 9/4/2020 <1.0 1,060 <1.0
4th Qtr 10/28/2020 <1.0 924 <1.0
1stQtr 2/23/20:ii' <1.0 948 <1.0
2ndQtr 6/9/2021 <1.0 957 <1.0
3rd Qtr 8/24/2021 <1.0 821
4th Qtr 12/1/2021 <1.0 957 <1.0
1st Qtr 3/9/2022 <1.0 946 <1.0
2nd Qtr 6/8/2022 <1.0 914 <1.0
3rdQtr 8/30/2022 <1.0 954 <1.0
4th Qtr 11/30/2022 <1.0 1 010 <1.0
(1) As of March 2012 both north and south Wild life ponds no lo~er receIvma.. water
(2) TW4•1 converted to a chloroform e,umpm2.,we11 started m 1/14/15
(:U,chloroform_fume,n,iwefl TW4-41 started m ~~2018 --·
NA = not analyzed
Shaded indicates concentrations exceeding GWQS.
Bold and italics indicates the MDL exceeded the GWQS.
J = Approximated value
1.18
<1.0 --------<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
23 J
<1.0
<1.0 --------
<1.0
<1.0
<5.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
:~:~ I
<1.0
<1.0
Chloride
No GWQS Ima/LI
NA
NA
NA
52
49
48
51
47
47
45
43
43
39
39
35
41
37
37
36
41
35
40
35
40
41
35
36
40
38 ---------42
39
40
37.6
39.1
37.6
36.5
38.9
37.4
38
--------38.7 38.3
40.3
45.9
38.5
41.7
44.4
44.7
44.2
41 .5
41.8
42.8
38.5
42
45.8
42.0
47.3
43.2
NA
40.9
44.8
46
44.2
47.5
46.4
43.7
41 .9
45.4
37.2
44.8
45.5
42.6
45.5
45.1
38.3
Nitrate, Nitrate + Nitrite
110 mo/LI
9.1
10.6
9.8
9.7
9.4
9.6
9.2 8.9
9
8.4
7.8
7.6
8.68
8.15
9.3
7.5
6.9
7.3
6.8
7.1
6.8
6.7
6.6
6.6
6.6
6.8
6.6 ___________ g .8
7.1
5.0
6.5
6.99
6.87
7.12
7.08
7.74
6.93
4.80
----------63 1 7.06
6.07
6.28
1.55
0.148
0.138
5.49
0.746
4.44
5.74
5.04
5.78
0.17
----------4.84 4.38
4.30
4.57
0.46
4.51
1.43
1.65
3.91
4.67
0.44
2.22
4.30
2.72
0.73
1.38
4.37
3.90
0.18
0.42
3.62
TABLE 1 (5 of 33)
Historic Summary Of Monitoring Well Analytical Results Up To The 4th Quarter 2022
Chloroform Contamination Investigation
DUSA White Mesa Mill
TW4-2 (chloroform pumping well
&1arting1114115) Parameter
Sampling Event •GWQSI
Carbon Tetrachloride Chloroform Chloromethane Methylene Chloride
15 ua/Ll 170 ua/Ll 130 un/Ll 15 ua/Ll
1sIQtr 3/16/2005 NA 3,700 NA NA
2nd Qtr 5/25/2005 NA 3,750 NA NA
3rdQtr 8/31/2005 <10 3,900 <10 <10
4th Otr 12nt2005 <50 3,500 <50 <50
1stQtr 3/9/2006 <50 3,800 <50 <50
2nd Qtr 6/14/2006 <50 3,200 <50 <50
3rdQtr 7/20/2006 <50 4,120 <50 <50
4th Qtr 11/8/2006 2.3 3 420 <1.0 <1.0
1st0tr 2/28/2007 1.8 2,300 <1.0 <1.0
2nd Qtr 6/27/2007 2.5 3,000 <1.0 <1.0
3rdQtr 8/15/2007 2.2 340 <1.0 <1.0
4th Qtr 10/10/2007 2.1 3 200 <1.0 <1.0
lstQtr 3/28/2008 2.3 3,300 <1.0 <1.0
2nd Qtr 6/25/2008 2.2 3,100 <1.0 <1.0
3rdQtr 9/10/2008 2.4 2,800 <1 .0 <1.0
4th Qtr 10/15/2008 NA #N/A NA NA
11/18/2008 2.4 3 200 <2.0 <2.0
1stQtr 3/11/2009 2.2 3,100 <1.0 <1.0
2nd Qtr 6/23/2009 2 2,800 <1.0 <1.0
3rd Qtr 9/14/2009 2 3,000 <1.0 <1.0
4th Qtr 12/29/2009 2 1600 <1.0 <1.0
1stQtr 3/3/2010 2 2,600 <1 .0 <1.0
2ndQtr 6/14/2010 2.6 3,300 <1.0 <1.0
3rd Qtr 8/18/2010 2.5 3,300 <1.0 <1.0
4thQtr 10/15/2010 2.1 3 000 <1.0 <1.0
lstQtr 2/24/2011 2.4 3,100 <1 .0 <1.0
2ndQtr 6/2/2011 2.2 3,000 <1 .0 <1.0
3rd Qtr 8/17/2011 1.6 2,400 <1 .0 <1.0
4th Qtr 11/29/2011 2.8 3900 <1.0 <1.0
r,f'i:lfr'l1) 112412012 2 2,500 <1.0 <1.0
2nd Qtr 6/14/2012 2.1 ---1:soo <1.0 ______ <1.□-----
3rd Qtr 9/4/2012 1.8 2,900 <1.0 <1.0
4th Qtr 10/4/2012 2 3 100 <1.0 <1.0
lstQtr 2/13/2013 5.17 3,580 <1.0 <1.0
2ndQtr 6/19/2013 2.65 3,110 2 <1.0
3rd Qtr 9/3/2013 2.41 3,480 <1.0 <1.0
4th Qtr 11/14/2013 3.15 3 740 <1.0 <1.0
lstQtr 2/6/2014 7.1 3,180 <1.0 <1.0
2ndQtr 5/23/2014 6.05 2,930 <1.0 <1.0
3rd Qtr 8/27/2014 1.4 3,170 3.6 <1.0
4th Qtr 10/30/2014 2.6 ___ ]21!Q <!Q. ______ <1.0
1st Qtr (2) -3/9/2015 1.44 1,840 <1.0 <1.0 -------
2ndQtr 6/8/2015 <1.0 1,650 <1.0 <1.0
3rd Qtr 8/31/2015 <1.0 1,060 2.6 <1.0
4th Qtr 10/19/2015 2.6 2 070 <1.0 <1.0
1stQtr 3/9/2016 1.2 1,970 <1.0 <1.0
2ndQtr 5/23/2016 1.49 2,070 <1.0 <1.0
3rd Qtr 7/25/2016 <1.0 1,780 <1.0 <1.0
4th Qtr 10/12/2016 <1.0 1600 <1.0 <1.0
lstQtr 3/8/2017 <1.0 1,570 <1.0 <1.0
2ndOtr 6/13/2017 <1.0 1,940 <1.0 <1.0
3rd Qtr 7/26/2017 <1.0 1,310 <1.0 <1.0
4th Qtr 10/11/2017 <1.0 1,610 <1.0 <1.0
DWMRC split sample <19 1,200 <30 68 J
DWMRC duolicate TW4-50 <19 1 200 <30 60 J
lstQtr 3/12/2018 <1.0 764 <1.0 <1.0
2ndQtr 6/8/2018 <1.0 949 <1.0 <1.0
3rd Qtr 8/22/2018 <1.0 980 <1.0 <1.0
4th Qtr 10/22/2018 <1.0 822 <1.0 <1.0
lstQtr 3/8/2019 <1.0 1,040 <1.0 <1.0
2nd Qtr 6/5/2019 <1.0 1,360 <1.0 <1.0
3rdQtr 9/4/2019 <1.0 797 <1.0 <1.0
4th Qtr 12/10/2019 <1.0 934 <1.0 <1.0
lstQtr 2/19/2020 <1.0 1,880 <1.0 <1.0
2nd Qtr 6/10/2020 <1.0 1,070 <1.0 <1.0
3rdQtr 9/4/2020 <1.0 1,260 <1.0 <1.0
4th Qtr 10/28/2020 <1.0 1 130 <1.0 <1.0
lstQtr 2/23/202i' <1.0 939 <1.0 <1.0
2nd Qtr 6/9/2021 <1.0 1,160 <1.0 <1.0
3rdQtr 8/24/2021 <1.0 1,150 <1.0 <1.0
4th Qtr 12/1/2021 <1.0 852 <1.0 <1.0
lstQtr 3/17/2022 <1.0 1,020 <1.0 <1.0
2nd Qtr 6/8/2022 <1.0 892 <1.0 <1.0
3rdQtr 8/30/2022 <1.0 832 <1.0 <1.0
4th Qtr 11/30/2022 <1.0 1 030 <1.0 <1.0
(1)As of March 2012 both north and south wild hfe ponds no lo~er receivma_water
J2J TW4-2 and TW4-11 converted to a chloroform .£.Umpm.2, well started in 1/14/15
NA and #N/A(for graph use)= not analyzed
Shaded indicates concentrations exceeding GWQS
Bold and italics indicates the MDL exceeded the GWQS.
J = Approximated value
Chloride
No GWQS lma/Ll
NA
NA
NA
56
56
56
54
55
54
50
49
51
48
46
42
47
NA
46
44
43
46
42
43
43
41
46
42
48
49
49 ---------52
76
49
46
46.9
44.9
43.9
45.9
45.4
45
--------45.5 44.9
48.1
50
41.9
43.4
43.8
42.9
44.3
43.1
43.6
43.2
43.5
44
43
44.4
41.3
44.3
41.7
40.4
39.8
40.8
41.5
42.1
40.6
41.3
38.7
43.3
32.5
36.8
41.9
36.7
39.5
40.7
35.5
Nitrate, Nitrate + Nitrite
110 ma/Ll
7.7
8.6
8.0
7.8
7.5
7.1
7.4
7.6
7.3
7.8
7.3
6.9
6.9
7.4
7.1
8.0
#N/A
6.5
6.4
6.6
6.4
6.8
8.7
6.6
6.5
7.0
6.8
6.0
7.0
7.1 -----------~.,. · 7.7
4.0
7.6
8.1
7.51
9.3
8.39
7.87
9.11
6.2
----------8)15 5.32
4.3
3.76
5.18
5.30
5.67
4.07
6.07
4.74
4.90
5.08
3.25
4.00
5.00
2.94
3.50
4.83
3.52
3.92
4.38
4.79
3.40
6.07
3.62
3.35
2.34
3.30
3.89
1.97
3.49
3.3
3.1
3.07
3.74
TW4-3
Sampling Event
TABLE 1 (6 of 33)
Historic Summary Of Monitoring Well Analytical Results Up To The 4th Quarter 2022
Chlorofonn Contamination Investigation
Carbon Tetrachloride Chloroform
(5 un/Ll 170 un/Ll
DUSA White Mesa Mill
Parameter
IGWQSl
Chloromethane Methylene Chloride Chloride
130 nn/Ll (5 ualll No GWQS Ima/LI
Nitrate, Nitrate + Nitrite
I10ma/LI
1stQtr 3/16/2005 NA <1.0 NA NA NA 3.5
2nd Qtr 5/25/2005 NA <1.0 NA NA NA 3.7
3rdQtr 8/31/2005 <1.0 <1.0 6.4 <1.0 NA 3.5
.. i~~h~I g=:~;---~1;7e:~g~ :: g, ______ _,1: g <1.·0'----2--l.3 :ig ~: H
2nd Qtr 6/14/2006 <1.0 <1.0 1.6 <1.0 26 7.1
3rd Qtr 7/20/2006 <1.0 <1.0 2.2 <1.0 26 2.9
4th Qtr 11/8/2006 <1.0 <1.0 <1.0 <1.0 23 1.5
1stQtr 2/28/2007 <1.0 <1.0 <1.0 <1.0 22 3.1
2nd Qtr 6/27/2007 <1.0 <1.0 <1.0 <1.0 23 3.3
3rdQtr 8/15/2007 <1.0 <1.0 <1.0 <1.0 24 3.1
1 7 <1.0 <1.0~--+<1.;-'.;.0 ____ +<.;-'1.;.0 _____ -+-------'27 2.8
<1.0 <1.0 <1.0 21· z:a
<1.0 <1.0 <1.0 19 2.9
3rd Qtr 9/10/2008 <1.0 <1.0 <1.0 <1.0 19 2.7 i:g:; ············10~~1~gg~ :::g ::g ::g'-----'-Hg,......-----i1------""~f ~:~
2nd Qtr 6/23/2009 <1.0 <1.0 <1.0 <1.0 20 2.9
3rdQtr 9/14/2009 <1.0 <1.0 <1.0 <1.0 21 2.8 i~~g: ··1 t~~~g~~ :::g :::g :: g'--~---'·:::g'------i-------'~"';+----------'~":"'
2nd Qtr 6/14/2010 <1.0 <1.0 <1.0 <1.0 24 3.0
3rdQtr 8/10/2010 <1.0 <1.0 <1.0 <1.0 22 3.1
4th Qtr 10/15/2010 <1.0 <1.0 <1.0, <1.0 26 3.3
1stQtr 2/15/2011 <1.0 <1.0 <1.0 <1.0 23 3.5
2ndQtr 5/25/2011 <1.0 <1.0 <1.0 <1.0 23 3.7
3rd Qtr 8/17/2011 <1.0 <1.0 <1.0 <1.0 23 4.0 1~i·§fo1 ........ 1:::;~gg ::.g ~Jg. . .... ·]J-,·g"-----':: g,......-----1------~23:1-_______ 4.4
2nd Qtr ---5/31/2012 <1.0 ---------<1.0 ----<1.0 ------<1.0 ----------~! -----------{!
3rdQtr 8/28/2012 <1.0 <1.0 <1.0 <1.0 25 4.9
4th Qtr 10/3/2012 <1.0 <1.0 <1.0 <1.0 25 .4.8 ·1si'o1r·············--·-··-···2m20w ·.:ro <1.0 ;;:ro <1.0 2f1 5.os
2nd Qtr 6/28/2013 <1.0 <1.0 <1.0 <1.0 23.8 5.83
3rd Qtr 9/3/2013 <1.0 <1.0 <1.0 <1.0 25 4.90
4th Qtr 11/8/2013 <1.0 <1.0 <1.0 <1.0 24.1 5.89
1stQtr 1/22/2014 <1.0 <1.0 <1.0 <1.0 24.9 6.66
2ndQtr 5/21/2014 <1.0 <1.0 <1.0 <1.0 24.4 6.01
3rd Qtr 8/13/2014 <1.0 <1.0 <1.0 <1.0 26 5.30
4th Qtr 10/23/2014 <1.0 <1.0 <1.0 <1.0 26.7 6.07 ·1.roii'·-······· ·········•··37,-\120·,s ·;;:ro ·;;:f·o <1.0 <1.0 26.2 6.64
2ndQtr 6/10/2015 <1.0 <1.0 <1.0 <1.0 27.5 5.71
0uplieateTW4-65 <1.0 <1.0 <1.0 <1.0 27.5 3.94
~
rd Qtr 8/13/2015 <1.0 <1.0 <1.0 <1.0 27.4 3.88 ~t Ji!! Ii! Ji! ~!"". ----.... i~~~-----1------'!;;l""J,-I. _______ ..,,!..;!
2nd Qtr 6/14/2017 <1.0 <1.0 <1.0 <1.0 28.7 6.36
3rd Qtr 7/27/2017 <1.0 <1.0 <1.0 <1.0 28.5 6.36
DuplicateTW4-65 <1.0 <1.0 <1.0 <1.0 28.9 6.24
14thQtr 10/11/2017 <1.0 <1.0 <1.0 <1.0 25.9 6.32
1stQtr 3/14/2018 <1.0 <1.0 <1.0 <1.0 29.8 6.46
DuplicateTW4-65 <1.0 <1.0 <1.0 <1.0 29.5 6.31
12nd Qtr 6/8/2018 <1.0 <1.0 <1.0 <1.0 26.1 6.52
3rd Qtr 8/29/2018 <1.0 <1.0 <1.0 <1.0 31.0 5.53
DupJicateTW4-65 <1.0 <1.0 <1.0 <1.0 31.0 5.44
14th Qtr 11/30/2018 <1.0 <1.0 <1.0 <1.0 27.4 5.85
Dupl~ateTW4-65 <1.0 ~.t9 <1.0 <1.0 26.2 5.77
1stQtr 3/13/2019 <1.0 <1.0 <1.0 <1.0 25.5 5.82
2nd Qtr 6/13/2019 <1.0 <1.0 <1.0 <1.0 27.4 6.68
DuplicateTW4-65 <1.0 <1.0 <1.0 <1.0 25.9 6.60
3rdQtr 9/11/2019 <1.0 <1.0 <1.0 <1.0 26.0 5.12
DuplicateTW4-65 <1.0 <1.0 <1.0 <1.0. 22.1 5.76
4th Qtr 12/12/2019 <1.0 <1.0 <1.0 <1.0 28 5.91
1stQtr 3/17/2020 <1.0 <1.0 ·.:fo <1.0 2i:'i 6.15
OuplcateTW4-65 <1.0 <1.0 <1.0 <1.0 26 6.38
2ndQtr 6/10/2020 <1.0 <1.0 <1.0 <1.0 26.2 6.53
Dup,cateTW4-65 <1.0 <1.0 <1.0 <1.0 26.7 6.63
3rd Qtr 9/17/2020 <1.0 <1.0 <1.0 <1.0 25.9 6.36 i:g:; ~;;~g~~ :::g :::g ::g'-----1::g~----1-1-------,~:: ::~~
DuplicateTW4-65 <1.0 <1.0 <1.0 <1.0 27.6 6.64
2ndQtr 6/15/2021 <1.0 <1.0 <1.0 <1.0 27 8.04
DuplicateTW4-65 <1.0 <1.0 <1.0 <1.0 23.9 7.89
3rd Qtr 9/15/2021 <1.0 <1.0 <1.0 <1.0 20.3 5.28
OupJicateTW4-65 <1.0 <1.0 <1.0 <1.0 20.7 6.19
4th Qtr 121112021 <1.0 <1.0 <1.0 <1.0 26.2 5.97
D'!p/icate TW4-65 .................. ·-·-····· <1 .. 0 <1.0 <1.0 <1.0 26.4 6.55 1stQtr 3/15/2022 <1.0 <1.0 <1.0 <1.0 24.3 6.1
2nd Qtr 6/15/2022 <1.0 <1.0 <1.0 <1.0 26.7 5.8
3rdQtr 9/13/2022 <1.0 <1.0 <1.0 <1.0 27.3 5.47
4th Qtr 11/30/2022 <1.0 <1.0 <1.0 <1.0 21.5 6.64
NA= not analyzed
Shaded indicates concentrations exceeding GWQS.
TW4-4 (chlorofo.-m pumping well
staredin1Mqll2010)
Sampling Event
1stQtr 3/16/2005
2nd Qtr 5/25/2005
3rdQtr 8/31/2005
4th Qtr 12fi/2005
1st Qtr 3/9/2006
2nd Qtr 6/14/2006
3rd Qtr 7/20/2006
41hO1r 11/8/2006
1s1Qtr 2/28/2007
2nd Qtr 6/27/2007
3rdQtr 8/15/2007
4thQtr 10/10/2007
1stQlr 3/28/2008
2ndQtr 6/25/2008
3rd Qtr 9/10/2008
4thQtr 10/15/2008
1stQtr 11/18/2008
1stQlr 3/4/2009
2ndQlr 6/23/2009
3rd Qlr 9/14/2009
4thQtr 12/29/2009
1stOtr(2) -2/t7/2010
2ndQtr 6/1 4/2010
3rdQlr 8/10/2010
4thQtr 10/15/2010
1stQtr 2/23/2011
2nd Qtr 6/1/2011
3rdQtr 8/t7/2011
41hQtr 11/16/2011 lifCiid fl 112312012
2nd Qtr ----6/6/2012
3rdQlr 9/4/2012
4th Qtr 10/3/2012
1stQtr 2/11/2013
2nd Qtr 6/29/2013
3rdQtr 9/3/2013
4thQtr 10/23/2013
1stOtr 1/27/2014
2nd Qtr 5/19/2014
3rdQtr 8/11/2014
4th Qtr 10/21/2014
1st Qtr 14) ---3/9/2015
2nd Qtr 6/10/2015
3rd Qlr 8/31/2015
4th Qtr 10/19/2015
1stQtr 3/9/2016
2nd Qtr 5/23/2016
TABLE 1 (7 of 33)
Historic Summary Of Monitoring Well Analytical Results Up To The 4th Quarter 2022
Chloroform Contamination Investigation
DUSA White Mesa Mill
Parameter
IGWQSI
Carbon Tetrachloride Chloroform Chloromethane Methylene Chloride Chloride
15 ua/LI 170 uo/LI 130 ua/LI 15 ua/LI No GWQS Ima/LI
NA 3,100 NA NA NA
NA 2,400 NA NA NA
<10 3,200 <10 <10 NA
<50 2 800 <50 <50 54
<50 2,900 <50 <50 51
<50 2,600 <50 <50 48
<50 2,850 <50 <50 50
1.7 2 670 <1.0 <1.0 49
1.5 2,200 <1.0 <1.0 49
1.7 2,400 <1.0 <1.0 47
1.5 2,700 <1.0 <1.0 45
1.5 2 500 <1.0 <1.0 47
1.6 2,800 <1.0 <1.0 43
1.5 2,500 <1.0 <1.0 42
1.4 2,200 <1.0 <1.0 39
NA #N/A NA NA 44 .~.ro 2 500 <2.0 <2.0 NA
1.2 2,200 <1.0 <1.0 37
1.2 1,800 <1.0 <1.0 34 ,., 2,000 <1.0 <1.0 39
1.1 950 <1.0 <1.0 41 ----------1 ---""iJoo <1.0 ______ <1.0 ---------------48
1.2 1,700 <1.0 <1.0 35
1.3 2,100 <1.0 <1.0 36
1.3 1 700 <1.0 <1.0 38
1.4 1,800 <1.0 <1.0 41
1.2 1,700 <1.0 <1.0 35
<1.0 1,500 <1.0 <1.0 40
1 1 500 <1.0 <1.0 39
<1.0 1,200 <1.0 <1.0 38
<1.0 ---------1]00 <1.0 ______ <1.0 --------------43
1.2 1,600 <1.0 <1.0 39
1 1 400 <1.0 <1.0 38
1 1,460 <1.0 <1.0 39
<1.0 1,330 <1.0 <1.0 39.6 ,_ 1.2 1,380 <1.0 <1.0 38.8
5.3 1 360 <1.0 <1.0 43.9
3.88 1,260 <1.0 <1.0 37.4
4.94 1,220 <1.0 <1.0 47.5
4.94 1,320 7.1 <1.0 40
<1.0 ___ JLl~ <!Q.. ______ <1.0 ---------40 1.05 1,350 <1.0 <1.0 --------37.6
<1.0 1,280 <1.0 <1.0 41.3
<1.0 1,220 1.72 <1.0 45.8
<1.0 1 190 <1.0 <1.0 38.5
<1.0 1,190 <1.0 <1.0 39.7
1.21 1,780 <1.0 <1.0 41.9
Nitrate, Nitrate + Nitrite
110 ma/LI
10.0
11.3
9.9
10.2
9.5
8.6
9.7
10.1
9.0
9.4
9.5
9.5
9.2
10.8
8.8
10.1
#N/A
10.2
8.2
8.4
-----------J.§ 6.6
7.6
7.3
7.1
7.0
7.0
6.6
7.0
7.1 -----------~ 7.1
7.1
7.0
7.36
6.30
7.22
7.84
7.28
5.91
5.3
----------7j)~ 7.7
6.33
6.45
6.27
6.7
6.56
3rdQtr 7/27/2016 <1.0 1,380 <1.0 <1.0 40.2 · 7.22
41hQtr 10/13/2016 <1.0 1 430 <1.0
1stQtr 3/8/2017 <1.0 1,290 <1.0
2nd Qtr 6/13/2017 <1.0 1,290 <1.0
3rdQtr 7/26/2017 <1.0 1,290 <1.0
4th Qtr 10/11/2017 <1.0 1 120 <1.0
1st Qtr 3/12/2018 <1.0 ___ J.!.~ <19.. ______
2ndQtr (3) --6/8/2018 <1.0 ------1,050 <1.0
3rdQtr 8/22/2018 <1.0 1,030 <1.0
4th Qtr 11/28/2018 <1.0 1 140 <1.0
1stOtr 3/8/2019 <1.0 1,050 <1.0
2nd Qtr 6/5/2019 <1.0 1,070 <1.0
3rdQtr 9/4/2019 <1.0 989 <1.0
4th Qlr 12/10/2019 <1.0 1 140 <1.0
1stQlr 2/19/2020 <1.0 1,100 <1.0
2nd Qtr 5/27/2020 <1.0 1,140 <1.0
3rdQtr 9/4/2020 <1.0 1,110 <1.0
4th Qtr 10/28/2020 <1.0 979 <1.0
1stQtr 2/23/2021 -~To 1,130 <1.0
2nd Qlr 6/9/2021 <1.0 1,240 <1.0
3rdQtr 8124/2021 <1.0 1,100 <1.0
4thQtr 12/1/2021 <1.0 950 <1.0
1stOtr 3/9/2022 ·<io 1,010 <1.0
2nd Qtr 6/8/2022 <1.0 1,110 <1.0
3rdQtr 8/30/2022 <1.0 1,040 <1.0
4th Qtr 11/30/2022 <1.0 1030 <1.0
(1)As of March 2012 bOth north and south w,ld life ponds no lo~receMna_ water
(2) TW4-4 converted to a Chloroform,.ell}TIPm,i.well stared m 1stqtr 2010 ---· J~ 1W4-41 1nstaAed as a Chloroform,e-HTIP'n,i.well stared In Max_2018 ____ _
(~ TW4~2 converted to a chloroform ~mpmg_well started In 1/14/15 ----·
NA and #N/A(for graph use)= not analyzed
Shaded indicates concentrations exceeding GWQS.
Bold and italics indicates the MDL exceeded the GWQS.
<1.0 40.3 6.77
<1.0 41.7 6.87
<1.0 40.7 7.06
<1.0 40.5 6.47
<1.0 40.7 6.90
<1.0 42.2 ----------6J~ <1.0 _____
39.0 6.34
<1.0 44.6 6.10
<1.0 41.4 6.02
<1.0 38.3 7.26
<1.0 38.5 10.40
<1.0 39.4 6.32
<1.0 40.4 6.52
<1.0 43.4 4.58
<1.0 46.1 7.26
<1.0 40.0 7.04
<1.0 38.6 6.77
<1.0 39.8 6.75
<1.0 39.4 9.02
<1.0 39.6 4.00
<1.0 42.5 7.32
<1.0 37.1 6.6
<1.0 39.9 6.0
<1.0 41.0 6.65
<1.0 29.6 6.59
TABLE 1 (8 of 33)
Historic Summary Of Monitoring Well Analytical Results Up To The 4th Quarter 2022
Chloroform Contamination Investigation
TW4-5
Sampling Event
DUSA White Mesa Mill
Parameter
IGWQS)
Carbon Tetrachloride
15 un/LI
Chloroform Chloromethane Methylene Chloride Chloride Nitrate, Nitrate+ Nitrite
170 uo/LI 130 un/LI 15 ua/Ll No GWQS lma/Ll 11 0 ma/Ll
1st Qtr 3/16/2005 NA 120 NA NA NA 4.9
2nd Qtr 5/25/2005 NA 113 NA NA NA 3.7
3rd Qtr 8/31/2005 <2.5 82 5.8 <2.5 NA 6.0 i~ g~ 1~~~: :~;',.;,------+-----,,:~~f-----~~.7~J-':~~c,;'--------l-------c;~~+--------':!".~~
2ndQtr 6/14/2006 <2.5 51 3.1 <2.5 51 5.9
3rd Qtr 7/20/2006 <1.0 53.7 <1.0 <1.0 54 6.7
4th Qtr 11/8/2006 <1.0 47.1 <1.0 <1.0 55 2.9
1stQtr 2/28/2007 .<i'.O 35 <1.0 <1.0 57 i.'8
2ndQtr 6/27/2007 <1.0 26 <1.0 <1.0 45 7.0
3rd Qtr 8/15/2007 <1.0 9.2 <1.0 <1.0 38 7.7
4th air 1011012001 <1.0 9.4 <1"'.o ____ -1,:<:.c1"'.o'--------1--------'3"'9+--------'8"'.2st 1stQtr 3/28/2008 <1.0 11 .<i'.O <1.0 36 7.4
2ndQtr 6/25/2008 <1.0 9.3 <1.0 <1.0 37 8.7
3rd Qtr 9/10/2008 <1.0 11 <1.0 <1.0 34 7.9
4th Qtr 10/15/2008 <1.0 10 <1.0 <1.0 37 9.3
1st Qtr 3/4/2009 <1.0 12 <1.0 <1.0 34 7.9
2ndQtr 6/23/2009 <1.0 13 <1.0 <1.0 37 7.5
3rd Qtr 9/14/2009 <1.0 12 <1.0 <1.0 48 8.3 i~~ g:; 1~;~~;~~~~!-'::.;:~.~,------+----'8"'"i1~:+:~~----+::.;:"".~'----------l-------'!+~+--------!~cc•~fl
2ndQtr 6/14/2010 <1.0 12 <1.0 <1.0 28 7.1
3rd Qtr 8/11/2010 <1.0 12 <1.0 <1.0 38 7.0
4th Qtr 10/15/2010 <1.0 11 <1.0 <1.0 41 7.2
1st Qtr 2/22/2011 <1.0 10 <1.0 <1.0 34 7.0
2ndQtr 5/26/2011 <1.0 9 <1.0 <1.0 35 7.2
3rdQtr 8n/2011 <1.0 10 <1.0 <1.0 37 7.5
4th Qtr 11/16/2011 NA #N/A NA NA 30 6.0
lifdfim :t1~;~~:~ :: ~ i~ :: ~ :: ~ ~A ________ 22 ~~---------ft~ 2nd Qtr ----616/2012 <1.0 ---8.4 <1.0 <1.0 --------39 8.0
3rd Qtr 9/11/2012 <1.0 12.0 <1.0 <1.0 37 8.1
•47'th"-=Q~tr ___ -=17'0/-=4/~2701cc2c+<-'-1"".o=--_____ -+-----c'c-8"E.o+<'-'1c;.o;-___ -+<_1;c.o:c-------1------~~3~8 7.7 1stQtr 2/13/2013 <1.0 10.8 <1.0 <1.0 34.:i 8.24
2ndQtr 6/13/2013 <1.0 11.2 <1.0 <1.0 36.5 10.70
3rd Qtr 9/5/2013 <1.0 11.6 <1.0 <1.0 39.1 7.79
4th Qtr 11/13/2013 <1.0 14.4 <1.0 <1.0 41.1 7.75
1stQtr 1/30/2014 <1.0 12.5 <1.0 <1.0 40.5 9.16
2nd Qtr 5/22/2014 <1.0 13.4 <1.0 <1.0 51.4 7.78
3rd Qtr 8/14/2014 <1.0 12.0 <1.0 <1.0 44 7.2
4th Qtr 10/13/2014 <1.0 14.6 <1.0 <1.0 45.1 8.31
1stQtr 3/12/2015 <1.0 13.ii'<1.0 <1.0 45.1 9.32
Dupllcate lW4-70 <1.0 13.8 <1.0 <1.0 46.4 8.81
2ndQtr 6/10/2015 <1.0 13.3 1.07 <1.0 47.3 7.08
3rd Qtr 9/10/2015 <1.0 12.9 <1.0 <1.0 52.2 8.1
i~ g:; 1~'.f""~'";~"'~"':~;+-:c:"':'c~------+------':"": i :: ~ :: ~ !!~ ~6°~
2ndQtr 5/23/2016 <1.0 13.6 <1.0 <1 .0 45.9 8.98
3rd Qtr 8/3/2016 <1.0 10.8 <1.0 <1 .0 44.6 8.49
4th Qtr(3) 10/26/2016 <1.0 9.9 <1.0 <1.0 47.8 8.32 D_upljcate1W4-75 _____ <1.0 ______ 12.0 <1.0 <1.0 ________ 49.5 __________ 83~
1stQtr 3/15/2017 <1.0 12.6 <1.0 ---<1.0 ____ 44.7 8.49
2ndQtr 6/15/2017 <1.0 14.6 <1.0 <1.0 47.3 8.52
3rd Qtr 8/8/2017 <1.0 14.6 <1.0 <1.0 48.6 8.52
41h Qtr 10/11/2017 <1.0 13.8 <1.0 <1.0 42.5 8.57
DWMRC solit samole <0.19 12 <0.3 <0.32 47 8.6
1stQtr 3/12/2018 <1.0 15.2 <1.0 <1.0 51.2 8.36
2ndQtr 6/13/2018 <1.0 13.9 <1.0 <1.0 47.3 9.24
3rd Qtr 8/30/2018 <1.0 15.4 <1.0 <1.0 54.7 7.34
DuplicateTW4-70 <1.0 15.3 <1.0 <1.0 55.9 7.28
4th Qtr 11/28/2018 <1.0 15.6 <1.0 <1 .0 49.8 7.67
DuolicateTW4•70 <1.0 16.2 <1.0 <1.0 48.5 7.80
'i'stQtr 3/16/2019 <1.0 1,i:'i' <1.0 <1.0 47.6 7.38
2nd Qtr 6/13/2019 <1.0 15.8 <1.0 <1.0 49.3 7.62
3rd Qtr 9/11/2019 <1.0 14.6 <1.0 <1.0 46.1 7.04
DuplicateTW4•70 <1.0 13.6 <1.0 <1.0 45.8 6.89
4th Qtr 12/14/2019 <1.0 15.7 <1.0 <1.0 53.1 6.97
DuolicatelW4•70 <1.0 16.0 <1.0 <1.0 52.5 7.29
·;-,ta1r 311112020 <1.0 14.8 <1.0 <1.0 48.3 1.10
DuplicatelW4•70 <1.0 14.8 <1.0 <1.0 48.4 7.72
2nd Qtr 6/11/2020 <1.0 15.4 <1.0 <1.0 49.5 7.83
3rdQtr 9/18/2020 <1.0 14.8 <1.0 <1.0 47.0 6.37
i~~ g:; 1i1;:;~~~~ :: ~=-------+--.....;:c:;~"'-J~ :1~ :: ~ 5~~ ~ 1~
2ndQtr 6/16/2021 <1.0 13.0 <1.0 <1.0 50.8 8.11
3rdQtr 9/22/2021 <1.0 11.2 <1.0 <1.0 39.8 6.63
fi""~he.t Q,;,Qt""~----=~12'=21"t=~"'g~;'l-:-'-:".~=-------+-------cai :: ~ :: ~ ;i ~ 6n
2nd Qtr 6/16/2022 <1.0 10.3 <1.0 <1.0 40.7 7.1
3rdQtr 9/14/2022 <1.0 13.2 <1.0 <1.0 45.8 7.22
4th Qtr 12/8/2022 <1.0 7.6 <1.0 <1.0 51.8 7.74
(1) voes were resampled because laboratory missed holding bme.
(2) As of March 2012 both north and south WIid lrfe ponds no lo!!9er recewina_water
l:1TcFi1ciroToml2'J]ie:ni We111Wl=:ffistartedinTTnh716--. -----·
NA and #N/Ajfor graphs) = not analyzed
Shaded indicates concentrations exceeding GWQS.
TW4-6
Sampling Event
TABLE 1 (9 of 33)
Historic Summary Of Monitoring Well Analytical Results Up To The 4th Quarter 2022
Chloroform Contamination Investigation
Carbon Tetrachloride
15 uo/Ll
DUSA White Mesa Mill
Parameter
IGWQS)
Chloroform Chloromethane Methylene Chloride Chloride
170 ua/Ll 130 ua/Ll (5 ua/Ll No GWQS Ima/LI
Nitrate, Nitrate + Nitrite
l10mn/L\
1stQtr 3/16/2005 NA <1.0 NA NA NA 0.2
2nd Qtr 5/25/2005 NA 2.5 NA NA NA 0.4
3rd Qtr 8/31/2005 <1.0 10 2.8 <1.0 NA 0.8
4th Qtr 12n/2005 <1.0 17 1.3 <1.0 32 0.9
1stQtr 3/9/2006 <1.0 31 <1.0 <1.0 31 1.2
2ndQtr 6/14/2006 <1.0 19 <1.0 <1.0 30 1.0
3rd Qtr 7/20/2006 <1.0 11 <1.0 <1.0 37 0.6
--~~~h~t g=~~r---~~~~=::=~~~~~7+:-:~.~~------1---~424: :: ~ :: ~ ~~ : :
2ndQtr 6/27/2007 <1.0 11 <1.0 <1.0 38 0.6
3rd Qtr 8/15/2007 <1.0 18 <1.0 <1.0 36 0.7
4th Qtr 10/10/2007 <1.0 18 <1.0 <1.0 35 0.8
1stQtr 3/28/2008 <1.0 52 <1.0 <1.0 33 1.1
2ndQtr 6/25/2008 <1.0 24 <1.0 <1.0 35 0.9
3rdQtr 9/1 0/2008 <1.0 39 <1.0 <1.0 35 1.1
tc~;=~h;-t gcc~c-----'1=0;:c;::;,45;c=~~:c;~"'~+:..,;;=.~;-------1----~~t :; ~ :; ~ ~~ ~.~
2ndQtr 6/23/2009,_<_,1~.o~-------1 120 <1.0 <1.0 37 2.7
3rdQtr 9/14/2009 <1.0 280 <1.0 <1.0 37 5.0
4th Qtr 12/29/2009 <1.0 250 <1.0 <1.0 41 6.1 1stQtr(5) -2/25/2010 <1.0 ------1000 <1.0 <1.0 ________ -------45 1.8
2nd Qtr 6/14/2010 <1.0 590 <1.0 <1.0 33 2.5
3rdQtr 8/11/2010 <1.0 630 <1.0 <1.0 31 3.9
4th Qtr 10/15/2010 <1.0 420 <1.0 <1.0 41 4.3
1stQtr 2/22/2011 <1.0 47 <1.0 <1.0 40 0.7
2nd Qtr 5/26/2011 <1.0 9.6 <1.0 <1.0 42 0.3
3rdQtr 8ni2011 <1.0 16 <1.0 <1.0 39 0.3
4th Qtr 11/16/2011 NA · #N/A NA NA 36 0.8
(1) 12/7/2011 <1.0 21 <1.0 <1.0 NA #N/A
FifCfiiHf 1 :;::;~~:~ :: ~ 50 <1.0 <1.0 33 0.8
2nd Qtr ----6/612012 <1.0 -------43~ :: ~ ------:: ~ -----------------!~ -----------{~
3rdQtr 9/11/2012 <1.0 6.9 <1.0 <1.0 21 0.1
4th Qtr 10/4/2012 <1.0 9 <1.0 <1.0 41 0.2
1st Qtr 2/13/2013 <1.0 6.89 <1.0 <1.0 40.4 0.2
2nd Qtr 6/13/2013 <1.0 4.86 <1.0 <1.0 37.9 0.2
3rd Qtr 9/5/2013 <1.0 5.93 <1.0 <1.0 40.6 0.2
4th Qtr 11/13/2013 <1.0 5.51 <1.0 <1.0 40.2 1.5
1stQtr 1/29/2014 <1.0 5.7 <1.0 <1.0 40.6 0.2
2nd Qtr 5/22/2014 <1.0 10.3 <1.0 <1.0 37 0.3
3rd Qtr 8/14/2014 <1.0 202 <1.0 <1.0 40 4.2
(3) 9/24/2014 <1.0 260 <1.0 <1.0 NA #NIA
l'~'-'~h,._tg"'1r"-tr __ _,1.,,_~~"'1""~~e:2,c~:'-':+:-=-:"'.~'-------1----,-.i"~3 ::~ ::~ ::~ ~~
2nd Qtr 6/10/2015 <1.0 1,040 <1.0 <1.0 41.6 5.9
3rdQtr 9/10/2015 <1.0 1,040 <1.0 <1.0 47 6.8
4th Qtr 10/29/2015 <1.0 843 <1.0 <1.0 40.2 5.6
1st Qtr 3/22/2016 <1.0 834 <1.0 <1.0 42.3 6.79
2nd Qtr 618/2016 <1.0 486 <1.0 <1.0 44.1 3.19
3rd Qtr 7127/2016 <1.0 ___ 433 <1.0 <1.0 42.2 3.85
4th Qtr 10/26/2016 <1.0 301 <1.0 <1.0 46.1 3.74
1s1Qtr 3/16/2017 <1.0 288 <1.0 <1.0 42.1 3.15
2nd Qtr 6/21/2017 <1.0 239 <1.0 <1.0 42.6 2.42
3rdQtr 8/8/2017 <1.0 129 <1.0 <1.0 42.9 1.71
4th Qtr 10/11/2017 <1.0 121 <1.0 <1.0 37.6 1.71 1stQtr 3/20/2018 <1.0 159 <1.0 <1.0 43.1 __________ Ul§ 2ndQtr(6) -6/14/2018 <1.0 _________ 74.9 <1.0 <1.0 ________ 40.2 1.48
3rdQtr 9/5/2018 <1.0 53.2 <1.0 <1.0 44 1.18
4th Qtr 12/12/2018 <1.0 37.0 <1.0 <1.0 20.0 0.90
1st Qtr 3/19/2019 <1.0 23.2 <1.0 <1.0 41 0.755
2nd Qtr 6/13/20"19 <1.0 15.8 <1.0 <1.0 38.1 0.484
3rdQtr 9/11/2019 <1.0 15.8 <1.0 <1.0 39.7 0.412
4th Qtr 12/14/2019 <1.0 7.4 <1.0 <1.0 45.7 0.244
1st Qtr 3/17/2020 <1.0 6.93 <1.0 <1.0 43.2 0.222
2ndQtr 6/11/2020 <1.0 4.9 <1.0 <1.0 42.4 0.205
3rdQtr 9/18/2020 <1.0 3.6 <1.0 <1.0 40.5 0.144
f4"th~Oe.tr ___ -!,1.,,11~41~2~02~04<:::.1!-'.o~-----+--~4~.6c=1+<:,1~.o(-----+<::,1,'.o~-----l------'4;,2-9 0.197 1st Qtr 3/18/2021 <1.0 3.78 <1.0 <1.0 4(5 0.205
2nd Qtr 6/16/2021 <1.0 2.9 <1.0 <1.0 43.8 0.215
3rdQtr 9/15/2021 <1.0 3.71 <1.0 <1.0 34.1 0.166
4th Qtr 12/8/2021 <1.0 3.92 <1.0 <1.0 44.8 <0.100
1stQtr 3/22/2022 <1.0 3.10 <1.0 <1.0 31.5 0.1
2nd Qtr 6/16/2022 <1.0 2.1 <1.0 <1.0 43.1 0.21
3rd Qtr 9/14/2022 <1.0 3.90 <1.0 <1.0 38.7 0.144
4th Qtr 12/8/2022 <1.0 1.50 <1.0 <1.0 40.7 0.134
(1) voes were resampled because laboratory mtsSed holdmg time.
(2) Results of the TW4-70 the duplicate sample for TW4.f3.
(3) Reanalyzed for voes onty.
(4) As of March 2012 both north and south Wild life ponds no I0!!9er receMnQ_water
(5) Chloroform _pum~~ well TW4-4 stared 1n 1~ <!!!_ 2010 __ .
(6) Chloroform .,PUffl~l!Q well 1W4-41 installed May2018 __ .
NA and #N/A(for graphs) = not analyzed
Shaded indicates concentrations exceeding GWQS.
TABLE 1 (10 of 33)
Historic Summary Of Monitoring Well Analytical Results Up To The 4th Quarter 2022
Chloroform Contamination Investigation
OUSA White Mesa Mill
TW4-7 Parameter
Sampling Event IGWQSl
Carbon Tetrachloride Chloroform Chloromethane Methylene Chloride
15 uo/LI 170 uo/LI 130 uo/LI 15 ua/LI
1st Ctr 3/16/2005 NA 3,100 NA NA
2nd Qtr 5/25/2005 NA 2,700 NA NA
3rdQtr 8/31/2005 <10 3,100 <10 <10
4th Qtr 1217/2005 <50 2,500 <50 <50
1stQtr 3/9/2006 <50 1,900 <50 <50
2nd Qtr 6/14/2006 <50 2,200 <50 <50
3rdQtr 7/20/2006 <50 2,140 <50 <50
4th Ctr 11/8/2006 1.5 2 160 <1.0 <1.0
1stQtr 2/28/2007 1.1 1,830 <1.0 <1.0
2nd0tr 6/27/2007 1.5 2,600 <1.0 <1.0
3rdQlr 8/15/2007 1.4 2,300 <1.0 <1.0
4th Qtr 10/10/2007 1.2 1 900 <1.0 <1.0
1stQtr 3/28/2008 1.3 2,200 <1.0 <1.0
2nd Qtr 6/25/2008 1.3 1,800 <1.0 <1.0
3rd Qtr 9/10/2008 1.4 1,600 <1.0 <1.0
4thQtr 10/15/2008 NA #NIA NA NA
11/18/2008 <2.0 2 500 <2.0 <2.0
1stQtr 3/11/2009 1.2 1,800 <1.0 <1.0
2ndQtr 6/23/2009 <1.0 1,400 <1.0 <1.0
3rd Qtr 9/14/2009 1 1,500 <1.0 <1.0
4thQtr 12/29/2009 <1 .0 1 300 <1.0 <1.0
1stQtr 2/25/2010 <1.0 1,200 <1.0 <1.0
2ndQtr 6/14/2010 <1.0 1,100 <1.0 <1.0
3rd Qtr 8/11/2010 1 1,500 <1.0 <1.0
4thQtr 10/15/2010 <1 .0 1100 <1.0 <1.0
1stQtr 2/23/2011 <1.0 1,300 <1.0 <1.0
2ndQtr 6/1/2011 <1.0 1,200 <1.0 <1.0
3rd Qtr 8/18/2011 <1.0 1,200 <1 .0 <1.0
4thQtr 11/29/2011 <1.0 1 000 <1 .0 <1.0 ·········--1,000 1stQtr(1) 1/19/2012 <1.0 <1.0 <1.0
2nd Qtr ---6/14/2012 <1.0 -----------790 <To ______ <1.0 ____
3rd Qtr 9/13/2012 <1.0 870 <1.0 <1.0
4thQtr 10/4/2012 <1.0 940 <1.0 <1.0
1stQtr 2/13/2013 <1.0 940 <1 .0 <1.0
2nd Ctr 6/18/2013 <1.0 953 <1.0 <1.0
3rd Ctr 9/12/2013 <1.0 1,040 <1.0 <1.0
4thQtr 11/14/2013 <1.0 1 050 <1.0 <1.0
1stQtr 2/5/2014 5.41 946 <1 .0 <1.0
2ndQtr 5/22/2014 4.78 847 <1 .0 <1.0
3rd Q1r 8/27/2014 <1.0 857 1.5 <1.0
4th Qtr 10/30/2014 <1.0 926 <1.0 <1.0
1st Qtr (2) -3/18/2015 <1.0 ----------942 <TO ______ <1.0 _____
2ndQtr 6/11/2015 <1.0 950 <1.0 <1.0
3rdQtr 9/10/2015 <1.0 897 <1.0 <1.0
4th Qtr 10/29/2015 <1.0 847 <1.0 <1.0
1stQtr 3/22/2016 <1.0 834 <1.0 <1.0
2nd Qtr 6/8/2016 <1.0 909 <1.0 <1.0
3rdQtr 8/4/2016 <1.0 1,000 <1.0 <1.0
4thQtr 10/26/2016 <1.0 886 <1.0 <1.0
1stQtr 3/21/2017 <1.0 986 <1.0 <1.0
2nd Qtr 6/21/2017 <1.0 968 <1.0 <1.0
3rdQtr 8/4/2017 <1.0 1,070 <1.0 <1.0
4th Qtr 10/11/2017 <1.0 884 <1.0 <1.0
OWMRC split samole <7.6 890 <12 17 J
1stQtr 3/21/2018 <1.0 721 <1.0 <1.0
2nd Qtr 6/14/2018 <1.0 751 <1.0 <1.0
3rdQtr 9/6/2018 <1.0 781 <1.0 <1.0
4thQtr 12/13/2018 <1.0 838 <1.0 <1.0
1stQtr 3/20/2019 <1.0 736 <1.0 <1.0
2nd Qtr 6/19/2019 <1.0 862 <1 .0 <1.0
3rdQtr 9/12/2019 <1.0 801 <1.0 <1.0
4thQtr 12/18/2019 <1.0 546 <1.0 <1.0
1stQtr 3/18/2020 <1.0 746 <1.0 <1.0
2nd Qtr 6/12/2020 <1.0 864 <1.0 <1.0
Oeplicate TW4-75 <1.0 871 <1.0 <1.0
3rdQtr 9/19/2020 <1.0 971 <1.0 <1.0
4th Qtr 11/11/2020 <1.0 967 <1.0 <1.0
OWMRC sollt samole <10 930 <20 <20
1stQtr 3/24/2021 <1.0 875 <1.0 <1.0
2nd Qtr 6/17/2021 <1.0 819 <1.0 <1.0
3rdQtr 9/23/2021 <1.0 801 <1.0 <1.0
4th Qtr 12/9/2021 <1.0 868 <1.0 <1.0
1stQtr 3/24/2022 <1 .0 776 2.1 <1.0
2nd Qtr 6/22/2022 <1.0 447 <1.0 <1.0
3rdQtr 9/15/2022 <1.0 887 <1.0 <1.0
4thQtr 12/9/2022 <1.0 824 <1.0 <1.0
(1) As of March 2012 both north and south WIid hfe ponds no lo!!9er receMna_ water
(~chloroform_eume,n.s. weHs TW4-1 and TW4-2 started 1n 1/14/15 _____ ,
NA and #N/A(for graphs) ::: not analyzed
Shaded indicates concentrations exceeding GWQS.
Bold and itafics indicates the MDL exceeded the GWQS.
J ::: Approximated value
Chloride
No GWQS Ima/LI
NA
NA
NA
52
48
47
51
49
47
45
44
45
43
43
35
40
NA
35
37
37
37
35
31
36
38
45
35
37
37
37 ---------41
40
41
37.7
39.3
36.4
37.2
38.2
37.7
39
40.2
40.4
42.1
46.7
40.6
42.4
44.1
42.3
45.8
40.5
43.3
44.7
43.7
42.0
44.5
41 .5
48.5
42.8
41.3
43.0
39.6
47.2
42.1
44.1
43.1
41 .5
42.8
43
46.2
41 .7
42.8
42.9
41 .3
42.5
45
44.8
Nitrate, Nitrate+ Nitrite
110 ma/LI
5.2
5.4
5.2
5.3
1
4.5
4.7
4.6
6
5.1
4.7
4.7
4.2
4.8
4.16
4.01
#N/A
3.7
3.8
4.1
4.2
3.8
3.9
3.9
4
3.6
4.0
4.1
3.8
----------· J .9 4.0
3.8
3.8
3.51
4
4.17
4.13
4.24
4.19
2.9
----------3ji8 4.25
2.62
4.72
3.49
4.43
3.75
4.21
4.33
3.87
4.15
4.20
4.35
4.30
3.96
4.45
4.34
3.98
4.01
4.19
3.76
3.11
3.75
4.06
4.19
3.87
4.40
3.90
4.25
4.80
4.58
3.02
4.1
3.9
3.77
4.06
TABLE 1 (11 of 33)
Historic Summary Of Monitoring Well Analytical Results Up To The 4th Quarter 2022
Chloroform Contamination Investigation
DUSA White Mesa Mill
TW4-3 Parameter
Sampling Event IGWQSl
Carbon Tetrachloride Chloroform Chloromethane Methylene Chloride
f5 ua/LI f70 ua/LI 130 un/L\ 15 ua/LI
1stQtr 3/16/2005 NA 10 NA NA
2ndQtr 5/25/2005 NA <1.0 NA NA
3rdQtr 8/31/2005 <1.0 1.1 1.7 NA
4thQtr 12/7/2005 <1.0 <1.0 <1.0 <1.0
1stQtr 3/9/2006 <1.0 1.3 2.1 <1.0
2ndQtr 6/14/2006 <1.0 1.8 1.0 <1.0
3rd Qtr 7/20/2006 <1.0 <1.0 <1 .0 <1.0
4thQtr 11/8/2006 <1.0 <1.0 <1.0 <1.0
1stQtr 2/28/2007 <1.0 2.5 <1.0 <1.0
2ndQtr 6/27/2007 <1.0 2.5 <1.0 <1.0
3rd Qtr 8/15/2007 <1.0 1.5 <1.0 <1.0
4thQtr 10/10/2007 <1.0 3.5 <1.0 <1.0
1stQtr 3/28/2008 <1.0 <1.0 <1.0 <1.0
2ndQtr 6/25/2008 <1.0 <1.0 <1.0 <1.0
3rd Qtr 9/10/2008 <1.0 <1.0 <1.0 <1.0
4thQtr 10/15/2008 <1.0 <1.0 <1.0 <1.0
1stQtr 3/4/2009 <1.0 <1.0 <1.0 <1.0
2ndQtr 6/23/2009 <1.0 <1.0 <1.0 <1.0
3rd Qtr 9/14/2009 <1.0 <1.0 <1.0 <1.0
4thQtr 12/17/2009 <1.0 <1.0 <1.0 <1.0
1stQtr 2/24/2010 <1.0 <1.0 <1.0 <1.0
2ndQtr 6/14/2010 <1.0 <1.0 <1.0 <1.0
3rd Qtr 8/18/2010 <1.0 <1.0 <1.0 <1.0
4thQtr 10/15/2010 <1.0 <1.0 <1.0 <1.0
lstQtr 2/16/2011 <1.0 <1.0 <1.0 <1.0
2ndQtr 5/25/2011 <1.0 <1.0 <1 .0 <1.0
3rd Qtr 8/16/2011 <1.0 <1.0 <1.0 <1.0
4thQtr 11/16/2011
r,rotriW ~11~;~~H
<1.0 <1.0 <1.0 <1.0
<1.0 <1.0 <1.0 <1.0
2nd Qtr ---5/13/2012 <1.0 ---------<1.0 ____ <1.0 ______ <1.0 ________
3rd Qtr 8/29/2012 <1.0 <1.0 <1.0
4thQtr 10/3/2012 <1.0 <1.0 <1.0
1stQtr 217/2013 <1.0 <1.0 <1.0
2ndQtr 5/30/2013 <1.0 <1.0 <1.0
3rd Qtr 9/5/2013 <1.0 <1.0 <1 .0
4thQtr 11/7/2013 <1.0 <1.0 <1.0
1stQtr 112312cff4 <1.0 63.8 <1.0
(2) 2/6/2014 <1.0 100 <1.0
2ndQtr 5/22/2014 <1.0 122 <1.0
3rd Qtr 8/27/2014 <1.0 107 <1.0
4th Qtr 10/29/2014 <1.0 191 <1.0
1statr(4) -3/12/2015 <1.0 -------------961 <1.0 ______
2ndQtr 6/11/2015 <1.0 981 <1.0
3rd Qtr 9/10/2015 <1.0 747 <1 .0
4th Qtr 10/29/2015 <1.0 770 <1 .0
1stQtr 3/17/2016 <1.0 634 <1.0
2ndQtr 6/8/2016 <1.0 595 <1.0
3rd Qtr 8/4/2016 <1.0 522 <1.0
4thQtr 10/27/2016 <1.0 472 <1.0
1stQtr 3/21/2017 <1.0 359 <1.0
2ndQtr 6/21/2017 <1.0 256 <1.0
3rd Qtr 8/4/2017 <1.0 223 <1 .0
4th_Qtr_ 10/11/2017 <1.0 214 <1.0
Deplicate TW4-75 <1.0 194
DWMRC solit samDle <1.9 230
1stQtr 3/21/2018 <1.0 220 <1.0
Deplicate TW4-75 <1.0 171 <1 .0
2ndQtr 6/14/2018 <1.0 155 <1.0
3rd Qtr 9/5/2018 <1.0 137 <1.0
4thQtr 12/13/2018 <1.0 93.8 <1 .0
1stQtr 3/19/2019 <1.0 103 <1 .0
2ndQtr 6/19/2019 <1.0 96 <1 .0
3rd Qtr 9/12/2019 <1.0 75.4 <1.0
Deplicate TW4-75 <1.0 75.6 <1 .0
4th Qtr 12/18/2019 <1.0 84.4 <1.0
·fstOtr 3/18/2020 <1.0 55.0 <1.0
2ndQtr 6/12/2020 <1.0 53.8 <1.0
3rd Qtr 9/18/2020 <1.0 39.5 <1.0
4th Qtr 11/11/2020 <1.0 51.3 <1.0
Deplicate TW4-70 <1.0 52.9 <1.0
DWMRC solit samole <10 50.0 <20
·fsiatr 3/18/2021 <{O 26.9 <1 .0
2ndQtr 6/1612021 <1.0 22.3 <1 .0
3rd Qtr 9/22/2021 <1.0 17.0 <1 .0
Depticate TW4-70 <1.0 16.4 <1 .0
4th Qtr 12/8/2021 <1.0 17.2 <1.0
1stQtr 3/23/2022 <1.0 15.1 <1.0
2ndQtr 6/16/2022 <1.0 10.9 <1.0
3rd Qtr 9/14/2022 <1.0 15.3 <1.0
4thQtr 12/8/2022 <1.0 4.4 <1.0
(1) voes were resampled because laboratory m1SSed holding nme.
(2) Resampled to verify chloroform concentration that was collected on 1/23/14.
(3) As of March 2012 both north and south wild life po3 ds no lo~er 1ece1vm~water
(4)chloroform_eume,n,2. wells TW4-1 and TW4-2 started m 1/14/15 -----·
NA and #N/A(for graphs)= not analyzed
Shaded indicates concentrations exceeding GWQS.
J = Approximated value
H = Sample was analyzed beyond holding times and may not be accureate concentration
1.12
4.7 J
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0 <1.0 --------
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<3.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<20
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
Chloride Nitrate, Nitrate + Nitrite
No GWQS Ima/LI I10ma/LI
NA <0.1
NA 0.2
NA <1.0
41 <1.0
39 0.3
37 <1.0
39 0.1
40 <.1
39 0.7
42 0.2
42 <1.0
43 0.5
46 0.1
45 <1.0
39 <0.05
44 <0.05
42 <0.1
44 <0.1
44 <0.1
51 <0.1
57 <0.1
42 <0.1
45 <0.1
46 0.1
52 <0.1
45 0.1
46 0.1
45 0.2
NA #N/A
---------45 -----------2-~ 44 0.2
48 0.1
47 <0.1
46.6 0.41
45.5 <0.1
47.5 0.1
46.1 ~.Q.1
48.5 0.166
46.5 0.166
53 0.538
47 0.6
--------46.7
__________ 091~
49.6 2.3
53 1.88
59.6 1.96
52 2.2
54.2 2.48
58.7 2.14
56.9 2.10
60.1 2.16
57.4 2.06
58.8 1.97
61 .2 1.64
52.2 1.92
56.2 1.71
61 1.90
60.8 1.36
60.8 1.36
53.8 1.31
63.2 1.40
53.1 1.35
54.3 1.23
56.5 1.1
52 0.999
52.5 1.030
60.1 1.21
53.8 1.04
56.9 1.06
52.6 0.894
54.7 1.27
49.9 1.27
56 0.16 H
52.8 1.00
51 .5 1.12
40.8 0.665
43.1 0.59
54.9 0.738
50.8 0.8
52.8 0.64
52.5 0.718
50.8 0.654
TW4-9
Sampling Event
TABLE 1 (12 of 33)
Historic Summary Of Monitoring Well Analytical Results Up To The 4th Quarter 2022
Chloroform Contamination Investigation
Carbon Tetrachloride
15 ua/Ll
OUSA White Mesa Mill
Parameter
IGWQS)
Chloroform Chloromethane Methylene Chloride Chloride
170 ua/Ll 130 "n/L\ 15 ua/Ll No GWQS lma/Ll
Nitrate, Nitrate + Nitrite
110 ma/Ll
1stQtr 3/16/2005NA 3.8NA NA NA 1.3
2nd Qtr 5/25/2005 NA 1.2 NA NA NA 1.3
3rd Qtr 8/31/2005 <1.0 <1.0 2.9 <1.0 NA 1.3
4th Qtr 12/7/2005 <1.0 <1.0 <1.0 <1.0 42 1.3
1stQtr 3/9/2006 <1.0 <1.0 2.6 <1.0 38 1.5
2nd Qtr 6/14/2006 <1.0 19 2.7 <1.0 39 1.5
3rd Qtr 7/20/2006 <1.0 <1.0 <1.0 <1.0 41 0.9
4th Qtr 11/8/2006 <1.0 <1.0 <1.0 <1.0 44 0.7
1st Qtr 2/28/2007 <1.0 <1.0 <1.0 <1.0 44 0.6
2ndQtr 6/27/2007 <1.0 21 <1.0 <1.0 42 1.3
3rdQtr 8/15/2007 <1.0 9.5 <1.0 <1.0 38 1.8
4th Qtr 10/10/2007 <1.0 8.7 <1.0 <1.0 40 2
1st Qtr 3/28/2008 <1.0 1.3 <1.0 <1.0 35 2.i°
2nd Qtr 6/25/2008 <1.0 1 <1.0 <1.0 35 2.3
3rd Qtr 9/10/2008 <1.0 <1.0 <1.0 <1.0 28 2.79
4th Qtr 10/15/2008 <1.0 <1.0 <1.0 <1.0 58 1.99
1st Qtr 3/4/2009 <1.0 <1.0 <1.0 <1.0 30 2.5
2nd Qtr 6/23/2009 <1.0 <1.0 <1.0 <1.0 30 2.3
3rd Qtr 9/14/2009 <1.0 <1.0 <1.0 <1.0 30 2.5
4th Qtr 12/17/2009 <1.0 <1.0 <1.0 <1.0 37 1.7
1st Qtr 2/23/20io <1.0 <1.0 <1.0 <1.0 47 1.4
2nd Qtr 6/14/2010 <1.0 <1.0 <1.0 <1.0 33 1.5
3rd Qtr 8/13/2010 <1.0 <1.0 <1.0 <1.0 40 1.2
4th Qtr 10/15/2010 <1.0 <1.0 <1.0 <1.0 34 1.8
1stQtr 2/17/2011 <1.0 <1.0 <1.0 <1.0 41 1.3
2nd Qtr 5/25/2011 <1.0 <1.0 <1.0 <1.0 38 3.4
3rdQtr 8/16/2011 <1.0 <1.0 <1.0 <1.0 21 4
4th Qtr 11/16/2011 NA NA NA NA 38 2.3
lsfOfrm ]~1~;~~11 :: ~ :: ~ :: ~ :: ~ NA 28 #~~ 2nd Qtr ---5/31/2012 <1.0 -----<1.0 ____ <1.0 ______ <1.0 --------------23 -----------,i.(j
3rd Qtr 8/30/2012 <1.0 <1.0 <1.0 <1.0 22 3.9
4th Qtr 10/3/2012 <1.0 <1.0 <1.0 <1.0 21 3.8
1st Qtr 217/2013 <1.0 <1.0 <1.0 <1.0 20.6 4.49
2nd Qtr 5/30/2013 <1.0 <1.0 <1.0 <1.0 21.4 4.49
3rd Qtr 9/5/2013 <1.0 <1.0 <1.0 <1.0 22.7 4.03
4th Qtr 11/7/2013 <1.0 <1.0 <1.0 <1.0 23.6 4.87
1st Qtr 1/29/2014 <1.0 <1.0 <1.0 <1.0 22 4.36
2nd Qtr 5/22/2014 <1.0 6.9 <1.0 <1.0 24 3.44
3rd Qtr 8/14/2014 <1.0 47 <1.0 <1.0 27 2.7
4th Qtr 10/29/2014 <1.0 101 <1.0 <1.0 25 4.29
1st Qtr 3/12/2015 <1.0 53.5 <1.0 <1.0 29.5 3.28
2nd Qtr 6/11/2015 <1.0 35.1 <1.0 <1.0 35.3 1.83
3rdQtr 9/3/2015 <1.0 48 <1.0 <1.0 39.3 1.44
4th Qtr 10/28/2015 <1.0 68.4 <1.0 <1.0 29.2 2.89
1st Qtr 3/17/2016 <1.0 74.3 <1.0 <1.0 33.6 2.51
2nd Qtr 6/8/2016 <1.0 76.2i-:<:..,1'!!.o'----+<'-'1-'c.o'-------a---------)3e;5'-!.1+-_______ 2~.-"16"1 1: g~ 10~~~~]~ :: ~ i~ ~f.':~:~.~'----+:~:~.~:------j---------i;~~~.~+--------~~.~11~
1stQtr 3/17/2017 <1.0 113 <1.0 <1.0 34.5 2.18
2nd Qtr 6/21/2017 <1.0 113 <1.0 <1.0 35.9 1.92
3rd Qtr 8/3/2017 <1.0 118 <1.0 <1.0 37 1.90
4th Qtr 10/11/2017 <1.0 132 <1.0 <1.0 32 2.18
DWMRC_splitsamale <0.98 120 <1.5 1 . .§).1-------3~5~------~2.20
1stQtr 3/21/2018 <1.0 159 <1.0 <1.0 38.3 1.85
2nd0tr 6/4/2018 <1.0 134 <1.0 <1.0 35.7 1.85
Deplicate TW4-75 <1.0 132 <1.0 <1.0 35.2 1.91
3rd Qtr 9/5/2018 <1.0 94.2 <1.0 <1.0 43.4 1.04
DeplicateTW4-75 <1.0 92.4 <1.0 <1.0 42.7 1.11
4th Qtr 12/13/2018 <1.0 109 <1.0 <1.0 36.3 1.23
1st Qtr 3/19/2019 <1.0 86.4 <1.0 <1.0 36.9 1.09
2ndQtr 6/19/2019 <1.0 68.1 <1.0 <1.0 38.3 0.785
3rd Qtr 9/11/2019 <1.0 66.0 <1.0 <1.0 35.2 0.904
4th Qtr 12/18/2019 <1.0 54.8 <1.0 <1.0 40.1 0.744
1st Qtr 3/18/2020 <1.0 48.9 <1.0 <1.0 37.7 0.855
2ndQtr 6/12/2020 <1.0 55.1 <1.0 <1.0 39.5 0.990
DeplicateTW4-70 <1.0 56.4 <1.0 <1.0 39.6 1.010
3rd Qtr 9/18/2020 <1.0 45.0 <1.0 <1.0 36.7 0.867
4th Qtr 11/11/2020 <1.0 47.1 <1.0 <1.0 37.2 1.11
DWMRC split sample <10 48.0 <20 <20 38 0.97 ~:~:c Dup samr';g;;~~'i :]o0 ;~ ~ :I%~-----+-":~"'00:,..------l-------4-J:; ~.~
DeplicateTW4-70 <1.0 38.2 <1.0 <1.0 38.7 1.07
2ndQtr 6/16/2021 <1.0 102 <1.0 <1.0 37.4 2.0
3rd Qtr 9/22/2021 <1.0 30.0 <1.0 <1.0 30.8 0.700
4th Qtr 12/8/2021 <1.0 25.4 <1.0 <1.0 36.9 0.798
1stQtr 3/23/2022°<1.0 1s:ii°<1.0 <1.0 34.6 0.80
2ndQtr 6/22/2022 <1.0 9.8 <1.0 <1.0 41.7 0.62
3rd Qtr 9/14/2022 <1.0 10.8 <1.0 <1.0 32.4 0.673
DepicateTW4-70 <1.0 8.7 <1.0 <1.0 32.4 0.660
4th Qtr 12/8/2022 <1.0 6.7 <1.0 <1.0 33.2 0.676
Denlicate TW4-70 <1.0 6.0 <1.0 <1.0 58.5 0.660
(1) voes were resampled because laboratory m1SSed holding time.
(2)As of March 2012 both north and south 'Mid llfe ponds no lo~er rece,vm~water
NA and #N/A(for graphs)= not analyzed
Shaded indicates concentrations exceeding GWQS.
J "' Approximate value
TABLE 1 (13 of 33)
Historic Summary Of Monitoring Well Analytical Results Up To The 4th Quarter 2022
Chloroform Contamination Investigation
DUSA White Mesa Mill
TW4-10 Parameter
Sampling Event IGWQS)
Carbon Tetrachloride Chloroform Chloromethane Methylene Chloride
15 ua/Ll 170 un/LI 130 un/L\ 15 ua/Ll
1st0tr 3/16/2005 NA 140 NA NA
2nd Qtr 5/25/2005 NA ~ NA NA
3rd Qtr 8/31/2005 <2.5 6.2 <2.5
4th Qtr 12nt2005 <2.5 300 <2.5 <2.5
1s!Qtr 3/9/2006 <5.0 190 <5.0 <5.0
2ndQtr 6/14/2006 <5.0 300 <5.0 <5.0
3rd Qtr 7/20/2006 <5.0 504 <5.0 <5.0
4th Qtr 11/8/2006 <1.0 452 1.6 <1.0
1stQtr 2/28/2007 <1.0 500 <1.0 <1.0
2ndQtr 6/27/2007 <1.0 350 <1.0 <1.0
3rd Qtr 8/15/2007 <1.0 660 <1.0 <1.0
4th Qtr 10/10/2007 <1.0 470 <1.0 <1.0
1stQtr 3/28/2008 <1.0 620 <1.0 <1.0
2ndQtr 6/25/2008 <1.0 720 <1.0 <1.0
3rdQtr 9/10/2008 <1.0 660 <1,0 <1.0
4thQtr 10/15/2008 NA #N/A NA NA
11/18/2008 <2.0 1 200 <2.0 <2.0
1stQtr 3/11/2009 <1.0 1,100 -<i".O <1.0
2ndQtr 6/23/2009 <1.0 1,200 <1.0 <1.0
3rd Qtr 9/14/2009 <1.0 910 <1.0 <1.0
4thQtr 12/22/2009 <1.0 300 <1.0 <1.0
1stQtr 3/3/2010 <1.0 460 <1.0 <1.0
2ndQtr 6/14/2010 <1.0 220 <1.0 <1 .0
3rdQtr 8/12/2010 <1.0 100 <1.0 <1 .0
4thQtr 10/15/2010 <1.0 1100 <1.0 <1 .0
1stQtr 2/23/2011 <1.0 620 <1.0 <1 .0
2ndQtr 6/14/2011 <1.0 280 <1.0 <1 .0
3rd Qtr 8/17/2011 <1.0 180 <1.0 <1 .0
4thQtr 11/16/2011 <1.0 110 <1.0 <1 .0
1st tltr (lj 111912012 <1.0 76 <1.0 <1.0
2nd Qtr ---6/14/2012 <1.0 ----------jg <1.0 ______ <1.0 ________
3rdQtr 9/12/2012 <1.0 130 <1.0 <1.0
4thQtr 10/3/2012 <1.0 140 <1.0 <1 .0
1s!Qtr 2/13/2013 <1.0 154 <1.0 <1.0
2ndQtr 6/13/2013 <1.0 486 <1.0 <1.0
3rdQtr 9/12/2013 <1.0 1,126 <1.0 <1.0
4thQtr 11/14/2013 <1.0 1 380 <1.0 <1.0
1stQtr 1/29/2014 5.16 1,260 <1.0 <1 .0
2ndQtr 5/23/2014 <1.0 1,110 <1.0 <1.0
3rd Qtr 8/27/2014 <1.0 1,060 1.5 <1 .0
4thQtr 10/30/2014 <1.0 1 220 <1.0 <1 .0
1stQtr 3/18/2015 <1.0 1,210 <1.0 <1.0
2ndQtr 6/11/2015 <1.0 1,240 <1.0 <1 .0
3rd Qtr 9/10/2015 <1.0 1,280 <1.0 <1 .0
4thQtr 10/29/2015 <1.0 1 350 <1.0 <1 .0
1stQtr 3/22/2016 <1.0 1,430 <1.0 <1.0·
2ndQtr 6/8/2016 <1.0 1,510 <1.0 <1.0
3rd Qtr 8/4/2016 <1.0 1,500 <1.0 <1.0
4thQtr 10/26/2016 <1.0 1 290 <1.0 <1.0
1stQtr 3/21/2017 <1.0 1,260 <1.0 <1.0
2ndQtr 6/21/2017 <1.0 1,140 <1.0 <1.0
3rd Qtr 8/4/2017 <1.0 1,320 <1.0 <1.0
4thQtr 10/11/2017 <1.0 1,150 <1.0 <1.0
DWMRC solrt samole <9.5 1100 <15 16 J
1stQtr 3/21/2018 <1.0 1,240 <1.0 <1.0
2ndQtr 6/14/2018 <1.0 914 <1.0 <1.0
3rd Qtr 9/6/2018 <1.0 911 <1.0 <1.0
4th Qtr 12/13/2018 <1.0 1 070 <1.0 <1.0
1stQtr 3/20/2019 <1.0 869 <1.0 <1.0
2ndQtr 6/19/2019 <1.0 799 <1.0 <1.0
3rd Qtr 9/12/2019 <1.0 734 <1.0 <1.0
4th Qtr 12/18/2019 <1.0 768 <1.0 <1 .0
1stQtr 3/18/2020 <1.0 798 <1.0 <1.0
2ndQtr 6/11/2020 <1.0 928 <1.0 <1.0
3rd Qtr 9/19/2020 <1.0 854 <1.0 <1.0
4th.Qtr 11/11/2020 <1.0 903 <1.0 <1.0
1stQtr 3/18/2021 <1.0 718 <1.0 <1.0
2ndQtr 6/17/2021 <1.0 609 <1.0 <1.0
3rd Qtr 9/23/2021 <1.0 545 <1.0 <1 .0
4th Qtr 12/9/2021 <1.0 675 <1.0 <1 .0
1stQtr 3/24/2022 <1.0 471 1 <1.0
Deplicate TW4-75 <1.0 456 1 <1 .0
2ndQtr 6/22/2022 <1.0 342 <1.0 <1.0
3rd Qtr 9/15/2022 <1.0 563 <1.0 <1.0
4th Qtr 12/9/2022 <1.0 499 <1.0 <1.0
(1)As of March 2012 both north and south wild llfe ponds no lo~er receMn~water
NA and #N/AJ,for graphs) = not analyzed
Shaded indicates concentrations exceeding GWQS.
J = Approximate value
Chloride
No GWQS Imo/LI
NA
NA
NA
52
50
54
61
58 2
54
59
59
55
58
51
61
NA
64
62
51
51
48
42
38
52
32
42
41
45
40 ---------46
44
45
49.1
51.5
67.9
70.9
73
77.3
74
75.2
78.6
75
89.5
79.9
84.1
89.5
85.3
84.4
74.6
73.1
77
70
76
72.7
64.5
75.5
63.5
59.3
58.7
55.8
62
53.5
60.1
53.9
58.6
58.1
48.7
50.6
51.9
46.0
44.8
46.0
52.0
43.4
Nitrate, Nitrate + Nitrite
110 mo/LI
1.6
0.8
1.1
3.3
2.4
3.5
6.8
5.7
7.3
5.1
7.3
6.7
7.3
9.9
9.23
10.5
#N/A
11.6
9.8
8.1
3.8
5.0
1.6
0.8
11.0
9.0
3.3
1.9
1.1 ___________ P-2
0.8
1.0
1.6
1.2
5.6
13.0
16.0
16.8
13.9
9.8
13.2
15.0
11.4
14.0
13.5
17.3
14.9
14.9
14.8
13.0
13.0
13.4
12.9
13.0
11.1
11.2
10.1
10.6
9.34
8.86
7.79
6.89
7.83
8.13
7.34
8.69
7.20
7.75
6.35
5.47
5.1
4.9
4.6
5.57
4.76
TABLE 1 (14 of 33)
Historic Summary Of Monitoring Well Analytical Results Up To The 4th Quarter 2022
Chloroform Contamination Investigation
DUSA White Mesa Mill
TW4-11{chlorotormpumpingwell
&tar1ed1/1.,15) Parameter
Sampling Event IGWQS)
Carbon Tetrachloride Chloroform Chloromethane Methylene Chloride
15 ua/L\ 170 ua/L\ 130 un/L\ 15 uo/LI
1st Qtr 3/16/2005 NA 4,400 NA NA
2ndQtr 512512005 NA 3,590 NA NA
3rd Qtr 8/31/2005 <10 4,400 <10 <10
4thQtr 12n/2005 <100 4,400 <100 <100
1stQtr 3/9/2006 <50 4,400 <50 <50
2ndQtr 6/14/2006 <50 4,300 <50 <50
3rd Qtr 7/20/2006 <50 4,080 <50 <50
4thQtr 11/8/2006 1.7 3 660 2.7 1.3
1stQtr 2/28/2007 1.3· 3,600 <1.0 1.6
2ndQtr 6/27/2007 1.6 3,800 <1.0 <1.0
3rd Qtr 8/15/2007 1.7 4,500 <1.0 <1.0
4thQtr 10/10/2007 1.6 4400 <1.0 1.2
1stQtr 3/28/2008 <1.0 340 <1.0 <1.0
2ndQtr 6/25/2008 <1.0 640 <1.0 <1.0
3rdQtr 9/10/2008 <1.0 900 <1.0 <1.0
4th Qtr 10/15/2008 NA #NIA NA NA
11/18/2008 <2.0 1 000 <2.0 <2.0
1stQtr 3/11/2009 <1.0 1,000 ·:c1.o <1.0
2nd Qtr 6/23/2009 <1.0 980 <1.0 <1.0
3rdQtr 9/14/2009 <1.0 1,000 <1.0 <1.0
4thQtr 12/22/2009 <1.0 860 <1.0 <1.0
1st0tr 3/3/2010 <1.0 820 <1.0 <1.0
2nd Qtr 6/14/2010 <1.0 820 <1.0 <1.0
3rd Qtr 8/12/2010 <1.0 800 <1.0 <1.0
4th Qtr 10/15/2010 <1.0 720 <1.0 <1.0
1stQtr 2/23/20.ii <1.0 1,000 <1.0 <1.0
2nd Qtr 6/1/2011 <1.0 930 <1.0 <1.0
3rdQtr 8/17/2011 <1.0 820 <1.0 <1.0
4thQtr 11/16/2011 <1.0 1500 <1.0 <1.0
·1stafrlI) 112412012 <1.0 610 <1.0 <1.0
2nd Qtr ---6/13/2012 <1.0 -------ssci <1.0 ______ <1.0 ____
3rdQtr 9/13/2012 <1.0 740 <1.0 <1.0
4th Qtr 10/3/2012 -~_1_.0 730 <1.0 <1.0
1stQtr 2/13/2013 3.23 867 <1.0 <1.0
2nd Qtr 6/18/2013 <1.0 788 <1.0 <1.0
3rdQtr 9/12/2013 <1.0 865 <1.0 <1.0
4th Qtr 11/13/2013 <1.0 874 <1.0 <1.0
1stQtr 2/5/2014 5.19 785 <1.0 <1.0
2nd Qtr 5/23/2014 <1.0 751 <1.0 <1.0
3rdQtr 8/27/2014 <1.0 719 1.2 <1.0
4thQtr 10/29/2014 <1 .0 803 <1.0 <1.0
1st Qtr{2) ---3/9/2015 1.24 ---2~50 <1.0 ______ <1.0 --------
2nd Qtr 6/11/2015 <1.0 2,710 <1.0 <1.0
3rd Qtr 8/31/2015 <1.0 1,120 <1.0 <1.0
4thQtr 10/29/2015 <1 .0 2 730 <1.0 <1.0
1stQtr 3/9/2016 1.2 2,660 <1.0 <1.0
2nd Qtr 5/23/2016 2.19 3,340 <1.0 <1.0
3rdQtr 7/25/2016 <1.0 --3-,200 <1.0 <1.0
4th Qtr 10/12/2016 <1.0 3 200 <1.0 <1.0
1stQtr 3/8/2017 1.71 3,310 <1.0 <1.0
2nd Qtr 6/13/2017 1.83 3,370 <1.0 <1.0
3rd Qtr 7/26/2017 1.81 3,290 <1.0 <1.0
4thQtr 10/11/2017 1.48 2,880 <1.0 <1.0
OWMRC solit samnle <38 2 900 <60 140 J
1stQtr 3/12/2018 1.82 3,090 <1.0 <1.0
2ndQtr 6/8/2018 1.34 2,800 <1.0 <1.0
3rd Qtr 8/22/2018 1.47 3,050 <1.0 <1.0
4thQtr 11/28/2018 1.33 ).~~Q .<1,0 <1.0
1stQtr 3/8/2019 1.48 2,820 <1.0 <1.0
2ndQtr 6/5/2019 1.52 2,970 1.4 <1.0
3rd Qtr 9/4/2019 1.47 2,790 <1.0 <1.0
4thQtr 12/18/2019 <1.0 3 250 <1.0 <1.0
1stQtr 2/19/2020 <1.0 2,990 <1.0 <1.0
2nd Qtr 5/11/2020 1.37 2,810 <1.0 <1.0
3rd Qtr 9/4/2020 1.47 3,070 <1.0 <1.0
4thQtr 10/28/2020 <1.0 2 670 3.86 <1.0 ·
1stQtr 2/23/2021 <1.0 2,750 <1.0 <1.0
2nd Qtr 6/9/2021 <1.0 3,320 <1.0 <1.0
3rdQtr 8/24/2021 <1.0 2,600 <1 .0 <1.0
4thQtr 12/1/2021 <1.0 2 850 <1.0 <1.0
1stQtr 3/9/2022 <1.0 2,780 <1.0 <1.0
2nd Qtr 6/8/2022 1.0 2,550 2.7 <1.0
3rdQtr 9/15/2022 <1.0 3,020 <1.0 <1.0
4thQtr 11/30/2022 <1.0 2 900 <1.0 <1.0
( 1) As of March 2012 bOth north and south wild life ponds no longer receMng water
(2) Chloroform pum_?~ wel started 1114115 -------·
NA = not analyzed
Bold and italics indicates the MOL exceeded the GWQS.
Bold and italics indicates the MOL exceeded the GWQS
J = Approximated value
Chloride
No GWQS Imo/LI
NA
NA
NA
58
56
56
55
55
54
53
53
53
63
46
42
47
NA
49
44
49
46
42
40
43
49
46
49
48
46
43 ---------52
49
50
47.3
49.3
46.6
46.7
48.5
51 .6
48
--------56.4 49.8
62.2
73.1
55.3
55.5
56.4
55.3
57.2
49.8
51 .4
51
49.7
52
54
52.4
53.3
45.4
46.8
45.3
48.8
49.0
51 .9
48.6
46.3
43.3
49.5
37.7
40.2
48.4
41 .5
44.5
42.4
36.6
Nitrate, Nitrate + Nitrite
110 ma/L\
8.7
10.3
9.4
9.4
9.2
10.0
10.0
10.0
10.1
10.6
10.2
9.8
7.7
7.3
7.9
9.5
#N/A
7.3
6.8
7.0
6.6
6.8
6.9
6.7
6.4
6.5
7.3
7.1
7.1
-----------2·~ 6.7
3.0
7.0
6.8
7.4
7.8
8.01
8.47
6.92
5.4
----------1y~ 8.72
8.48
9.61
7.5
7.13
7.81
8.83
8.92
8.12
7.92
7.78
7.79
8.0
7.89
7.51
7.15
6.85
7.50
8.30
7.15
7.14
7.07
7.56
7.59
7.19
7.21
8.17
5.78
7.44
7.4
5.9
6.90
7.05
TABLE 1 (15 of 33)
Historic Summary Of Monitoring Well Analytical Results Up To The 4th Quarter 2022
Chloroform Contamination Investigation
DUSA White Mesa Mill
TW4-12 Parameter
Sampling Event IGWQSl
Carbon Tetrachloride Chloroform Chloromethane Methylene Chloride
15 ua/LI 170 ua/LI 130 ua/LI 15 ua/Ll
1stQtr 3/16/2005 NA <1.0 NA NA
2nd Qtr 5/25/2005 NA <1.0 NA NA
3rd Qtr 8/31/2005 <1.0 <1.0 5.8 <1.0
4lhQtr 12ll/2005 <1.0 <1.0 1.0 <1.0
1stQtr 319/2006 <1.0 <1.0 2.6 <1.0
2nd Qtr 6/14/2006 <1.0 <1.0 1.4 <1.0
3rd Qtr 7120/2006 <1.0 <1.0 1.4 <1.0
4lhQtr 11/8/2006 <1.0 <1.0 <1.0 <1.0
1stQtr 2/28/2007 <1.0 <1.0 <1.0 <1.0
2ndQtr 6/27/2007 <1.0 <1.0 <1.0 <1.0
3rdQtr 8/15/2007 <1.0 <1.0 <1.0 <1.0
4th Qtr 10/10/2007 <1.0 <1.0 <1.0 <1.0
1stQtr 3/28/2008 <1.0 <1.0 <1.0 <1.0
2ndQtr 6/25/2008 <1.0 <1.0 <1.0 <1.0
3rd Qtr 9/10/2008 <1.0 <1.0 <1.0 <1.0
4lhQtr 10/15/2008 <1.0 <1.0 <1.0 <1.0
1stQtr 3/11/2009 <1.0 <1.0 <1.0 <1.0
2ndQtr 6/2312009 <1.0 '.C'.1.0 <1.0 <1.0
3rd Qtr 9/14/2009 <1.0 <1.0 <1.0 <1.0
4th Qtr 12/16/2009 <1.0 <1.0 <1.0 <1.0
1st0tr 2/23/2010 <1.0 <1.0 <1.0 <1.0
2ndQtr 6/14/2010 <1.0 <1.0 <1.0 <1.0
3rd Qtr 8/10/2010 <1.0 <1.0 <1.0 <1.0
4thQtr 10/15/2010 <1.0 <1.0 <1.0 <1.0
1stQtr 2/15/2011 <1.0 <1.0 <1.0 <1.0
2nd Qtr 5/25/2011 <1.0 <1.0 <1.0 <1.0
3rd Qtr 8/16/2011 <1.0 <1.0 <1.0 <1.0
4th Qtr 11/15/2011 <1.0 <1.0 <1.0 <1.0
\sf0fr'l1) 111112012 <1.0 <1.0 <1.0 <1.0
2nd Qtr ---5/31/2012 <1.0 -----<1.0 ____ <1.0 ______ <1.0 --------
3rdQtr 8/29/2012 <1.0 <1.0 <1.0 <1.0
4lhQtr 10/3/2012 <1.0 <1.0 <1.0 <1.0
1stQtr 2/13/2ti'fa <1.0 <1.0 <1.0 <1.0
2nd Qtr 5/29/2013 <1.0 <1.0 <1.0 <1.0
3rdQtr 8/29/2013 <1.0 <1.0 <1.0 <1.0
4thQtr 11/6/2013 <1.0 <1.0 <1.0 <1.0
1stQtr 1/22/2014 <1.0 <1.0 <·1.0 <1.0
2nd Qtr 5/21/2014 <1.0 <1.0 <1.0 <1.0
3rdQtr 8/27/2014 <1.0 <1.0 <1.0 <1.0
4th Qtr 10/23/2014 <1.0 <1.0 <1.0 <1.0
1stQtr 3/11/2015 <1.0 <1.0 <1.0 <1.0
2nd Qtr 6/10/2015 <1.0 <1.0 <1.0 <1.0
3rd Qtr 912/2015 <1.0 <1.0 <1.0 <1.0
4lhQ1r 10/21/2015 <1.0 <1.0 <1.0 <1.0
Oeolicate TW4-65 <1.0 <1.0 <1.0 <1.0
Etatr 3/15/2016 <i.o <1.0 <1.0 <1.0
2nd Qtr 5/25/2016 <1.0 <1.0 <1.0 <1.0
0epliealeTW4-t 5/2512016 <1.0 <1.0 <1.0 <1.0
3rdQtr 7127/2016 <1.0 <1.0 <1.0 <1.0
4thQtr 10/12/2016 <1.0 <1.0 <1.0 <1.0
1st Qtr 3/14/2017 <1.0 <1.0 <1.0 <1.0
2nd Qtr 6/14/2017 <1.0 1.25 <1.0 <1.0
3rdQtr 8/2/2017 <1.0 1.2 <1.0 <1.0
Deplicate lW4-70 <1.0 1.19 <1.0 <1.0
4th Qtr 10/10/2017 <1.0 <1.0 <1.0 <1.0
Q.!f!!icate TW4-70 <1.0 <1.0 <1.0 <1.0
1st Qtr 3114/2018 <1.0 <1.0 <1.0 <1.0
2nd Qtr 6/12/2018 <1.0 <1.0 <1.0 <1.0
3rd Qtr 8/29/2018 <1.0 <1.0 <1.0 <1.0
4th Qtr 11/30/2018 <1.0 <1.0 <1.0 <1.0
1sIQtr 3/16/2019 <1.0 <1.0 <1.0 <1.0
2nd Qtr 6/13/2019 <1.0 <1.0 <1.0 <1.0
3rdQtr 9/11/2019 <1.0 <1.0 <1.0 <1.0
4lhQtr 12/14/2019 <1.0 <1.0 <1.0 <1.0
1s!Qtr 3/17/2020 <1.0 <1.0 <1.0 <1.0
2ndQtr 6/11/2020 <1.0 <1.0 <1.0 <1.0
3rd Qtr 9/17/2020 <1.0 <1.0 <1.0 <1.0
4th Qtr 11/4/2020 <1.0 <1.0 <1.0 <1.0
1st Qtr 3/17/2021 <1.0 <1.0 <1.0 <1.0
2ndQtr 6/15/2021 <1.0 <1.0 <1.0 <1.0
3rd Qtr 9/15/2021 <1.0 <1.0 <1.0 <1.0
4th Qtr 12m2021 <1.0 <1.0 <1.0 <1.0
1s!Qtr 3/15/2022 <1.0 <1.0 <1.0 <1.0
2ndQtr 6/15/2022 <1.0 <1.0 <1.0 <1.0
3rd Qtr 9/13/2022 <1.0 <1.0 <1.0 <1.0
4thQtr 12n12022 <1.0 <1.0 <1.0 <1.0
Oeolicate lW4-65 <1.0 <1.0 <1.0 <1.0
(1)As of March 2012 both north and south wild ltfe ponds no lo~er rece,vm~water
NA= not analyzed
Shaded indicates concentrations exceeding GWOS.
Chloride
No GWQS lma/Ll
NA
NA
NA
19
19
16
16
16
16
18
29
16
16
19
18
22
23
22
22
23
22
29
35
31
31
32
31
30
28 ---------34
39
39
36.7
38.6
41.7
41.4
41.6
40.2
47
50.2
50.6
56
60.2
51
51.3
56.2
66.4
67
67.5
72.6
62.6
67.2
65.3
67
56.2
61.4
59.5
53.6
59.9
56.1
50.8
55.3
52.6
58.0
53.0
51 .7
50.3
48.0
52.0
51 .8
36.1
49.8
25.8
53.3
57.9
49.2
50.9
Nitrate, Nitrate + Nitrite
110 ma/LI
1.4
1.6
1.5
1.4
1.3
1.4
1.4
1.4
1.5
1.5
1.4
1.4
1.6
2.7
2.7
2.5
2.4
3.8
5.1
3.6
4.0
11.0
9.0
8.0
6.5
7.0
6.8
8.0 ___________ !·!
10.0
13.0
13.0
12.6
14.2
17.4
16.4
18.4
17.0
13.0
16.1
19.2
18.8
16.4
18.0
18.0
34.8
30.7
113.0
37.7
25.8
25.9
29.9
25.1
26.7
26.9
26.8
19.8
18.4
13.6
10.4
10.1
8.31
8.88
8.04
6.39
4.95
2.34
5.91
3.10
2.39
1.95
1.46
8.4
16.0
13.8
4.68
7.02
TABLE 1 (16 of 33)
Historic Summary Of Monitoring Well Analytical Results Up To The 4th Quarter 2022
Chloroform Contamination Investigation
DUSA White Mesa Mill
TW4-13 Parameter
Sampling Event IGWQS)
Carbon Tetrachloride Chloroform Chloromethane Methylene Chloride
15 uo/L\ 170 uo/L\ 130 un/L\ 15 ua/Ll
1stQtr 3/16/2005 NA <1.0 NA NA
2ndQtr 5/25/2005 NA <1.0 NA NA
3rd Qtr 8131/2005 <1.0 <1.0 3.1 <1.0
4thQtr 12/7/2005 <1.0 <1.0 <1.0 <1.0
1stQtr 3/9/2006 <1.0 <1.0 1.7 <1.0
2ndQtr 6/1412006 <1.0 <1.0 1.4 <1.0
3rd Qtr 712012006 <1.0 <1.0 <1.0 <1.0
4th Qtr 111812006 <1.0 <1.0 <1.0 <1.0
1stQtr 212812007 <1.0 <1.0 <1.0 <1.0
2ndQtr 612712007 <1.0 <1.0 <1.0 <1.0
3rd Qtr 8115/2007 <1.0 <1.0 <1.0 <1.0
4thQtr 10110/2007 <1.0 <1.0 <1.0 <1.0
1stQtr 3/28/2008 <1.0 <1.0 <1.0 <1.0
2ndQtr 6125/2008 <1.0 <1.0 <1.0 <1.0
3rd Qtr 9110/2008 <1.0 <1.0 <1.0 <1.0
4th Qtr 10115/2008 <1.0 <1.0 <1.0 <1.0
1stQtr 31412009 <1.0 <1.0 <1.0 <1.0
2ndQtr 6/2312009 <1.0 <1.0 <1.0 <1.0
3rd Qtr 911412009 <1.0 <1.0 <1.0 <1.0
4th0tr 12/16/2009 <1.0 <1.0 <1.0 <1.0
1stQtr 2/24/2010 <1.0 <1.0 <1.0 <1.0
2nd Otr 6114/2010 <1.0 <1.0 <1.0 <1.0
3rd Qtr 8/10/2010 <1.0 <1.0 <1.0 <1.0
4th0tr 10115/2010 <1.0 <1.0 <1.0 <1.0
1stQtr 2/1512Cffi" <1.0 <1.0 <1.0 <1.0
2nd Qtr 512512011 <1.0 <1.0 <1.0 <1.0
3rd Qtr 8/1612011 <1.0 <1.0 <1.0 <1.0
· 4th Qtr 1111512011 <1.0 <1.0 <1.0 <1.0
1st Otr(1) 111712012 <1.0 <1.0 <1.0 <1.0
2nd Qtr ---5131/2012 <1.0 --<T.O ____ <T.O ______ <1.0 ________
3rd Qtr 8/2912012 <1.0 <1.0 <1.0 <1.0
4thQtr 10/312012 <1.0 <1.0 <1.0 <1.0
tstQtr 2/131201:i <1.0 <1.0 <1.0 <1.0
2ndQtr 512912013 <1.0 <1.0 <1.0 <1.0
3rd Qtr 8/2912013 <1.0 <1.0 <1.0 <1.0
4th Qtr 111612013 <1.0 <1.0 <1.0 <1.0
1st0tr 112212014 <1.0 <1.0 <1.0 <1.0
2nd Qtr 512112014 <1.0 <1.0 <1.0 <1.0
3rd Qtr 8/2312014 <1.0 <1.0 <1.0 <1.0
4th Qtr 1012312014 <1.0 <1.0 <1.0 <1.0
tstQtr 3111/2015 <1.0 <1.0 <1.0 <1.0
2nd Qtr 611012015 <1.0 <1.0 <1.0 <1.0
3rdQtr 912/2015 <1.0 <1.0 <1.0 <1.0
4thQtr 1012112015 <1.0 <1.0 <1.0 <1.0
1stQtr 3/1612016 <1.0 <1.0 <1.0 <1.0
2nd Qtr 512512016 <1.0 <1.0 <1.0 <1.0
3rdQtr 7/2812016 <1.0 <1.0 <1.0 <1.0
4th Qtr 10/19/2016 <1.0 <1.0 <1.0 <1.0
1stQtr 3/1612017 <1.0 <1.0 <1.0 <1.0
2nd Otr 6/1512017 <1.0 <1.0 <1.0 <1.0
3rdQtr 812/2017 <1.0 <1.0 <1.0 <1.0
4thQtr 10/10/2017 <1.0 <1.0 <1.0 <1.0
tstQtr 3/1412018 <1.0 <1.0 <1.0 <1.0
2nd Qtr 611212018 <1.0 <1.0 <1.0 <1.0
3rd0tr 8/2912018 <1.0 <1.0 <1.0 <1.0
4th Qtr 1113012018 <1.0 <1.0 <1.0 <1.0
tstQtr 3/1612019 <1.0 <1.0 <1.0 <1.0
2nd Qtr 6/1312019 <1.0 <1.0 <1.0 <1.0
3rdQtr 9111/2019 <1.0 <1.0 <1.0 <1.0
4th Qtr 12/1412019 <1.0 <1.0 <1.0 <1.0
1st0tr 3/1712020 <1.0 <1.0 <1.0 <1.0
2nd Qtr 611112020 <1.0 <1.0 <1.0 <1.0
3rd Qtr 911712020 <1.0 <1.0 <1.0 <1.0
4th Qtr 111412020 <1.0 <1.0 <1.0 <1.0
1stQtr 311712021 <1.0 <1.0 <1.0 <1.0
2nd Qtr 611512021 <1.0 <1.0 <1.0 <1.0
3rdQtr 911512021 <1.0 <1.0 <1.0 <1.0
4th Qtr 12/712021 <1.0 <1.0 <1.0 <1.0
1st0tr 3116/2022 <1.0 <1.0 <1.0 <1.0
2ndQtr 6115/2022 <1.0 <1.0 <1.0 <1.0
3rd Qtr 9/1312022 <1.0 <1.0 <1.0 <1.0
4th Qtr 12m2022 <1.0 <1.0 <1.0 <1.0
(1)As of March 2012 both north and south WIid llfe ponds no lo~er recewma..water
NA= not analyzed
Shaded indicates concentrations exceeding GWQS.
Chloride
No GWQS lma/Ll
NA NA
NA
69
67
66
65
33
59
59
58
58 54
58
50
58
58
57
63
60
53
53
55
55
60
56
60
54
---------55 59
60
60
59.3
56
63.5
58.5
63.1
56.1
62
66.1
66.4
70.3
76.5
65.5
69.4
71.8
69.3
70.9
66.0
70.4
70.5
60.9 71.0
65.0
73.7
64.5
61.6
65.4
65.3
68.7
63.9
62.7
60.2
60.6
67.:i
57.7
54.2
61 .0
59.2
62.6
62.4
56.9
Nitrate, Nitrate + Nitrite
110 ma/Ll
4.2
4.3
4.6
4.3
4.2
4.9
4.3
0.8
4.0
4.6
4.4
4.1
3.8
4.2
4.3
4.6
3.7
1.2
4.7
4.1
4.3
5.2
5.6
5.8
5.5
6.4
5.2
5.9 ___________ ft-~
6.0
6.2
5.9
6.31
6.8
7.16
6.48
7.09
5.99
4.8
6.28
7.09
6.32
5.7
5.78
7.97
5.87
6.14
6.20
6.05
6.49
6.15
6.17
5.76
6.24
5.13
5.29
5.74
6.56
5.19
5.17
5.5
9.0
5.25
4.92
5.57
2.9
4.80
5.06
4.80
4.5
4.37
4.87
TW4-14
Sampling Event
TABLE 1 (17 of 33)
Historic Summary Of Monitoring Well Analytical Results Up To The 4th Quarter 2022
Chlorofonn Contamination Investigation
DUSA White Mesa Mill
Parameter
IGWQSl
Carbon Tetrachloride Chloroform Chloromethane Methylene Chloride Chloride
15 ua/Ll (70 ua/Ll (30 ua/Ll (5 ua/Ll No GWQS (ma/Ll
Nitrate, Nitrate + Nitrite
(10mnn I
1st Qtr 3/16/2005 NS NS NS NS NS NS
2nd Qtr 5/25/2005 NS NS NS NS NS NS
3rd Qtr 8/31/2005 NS NS NS NS NS NS
4th Qtr 1217/2005 NS,_ ______ _,.NS NS NS NS NS 1st Qtr 3/9/2006 "i-is "fis Ns=-----+N;-;s=-------tNS;-------1-,;N~S--------1
2nd Qtr 6/14/2006 NS NS NS NS NS NS
3rd Qtr 7/20/2006 NS NS NS NS NS NS t:g:; ~g~g~ :I:g-------+~fo :::g;-----t:-c:ccga---------1-------a~~ ~:1
2nd Qtr 6/27/2007 <1.0 <1.0 <1.0 <1.0 38 1.4
3rdQtr 8/15/2007 <1.0 <1.0 <1.0 <1.0 36 1.1
4th Qtr 10110/2007 <1.0 <1.0 <1.0 <1.0 38 0.8
1stQtr 3/28/2008 <1.0 <1.0 <1.0 <1.0 57 0.4
2nd Qtr 6/25/2008 <1.0 <1.0 <1.0 <1.0 35 1.6
3rd Qtr 9/10/2008 <1.0 <1.0 <1.0 <1.0 34 1.38
4th Qtr 10/15/2008 <1.0 <1.0 <1.0 <1.0 40 0.76
1stQtr 3/4/2009 <1.0 <1.0 <1.0 <1.0 35 1.6
2nd Qtr 6/23/2009 <1.0 <1.0 <1.0 <1.0 36 1.4
3rd Qtr 9/14/2009 <1.0 <1.0 <1.0 <1.0 38 1.5
;~~g:; 1~:~~g~~ :::g------+JJ'.g :::g,------11H ~1 H
2nd Qtr 6/14/2010 <1.0 <1.0 <1.0 <1.0 49 2.9
3rdQtr 8110/2010 <1.0 <1.0 <1.0 <1.0 35 2.8
4th Qtr 10/15/2010 <1.0 <1.0 <1.0 <1.0 291-------~2.9
1stQtr 2/15/2011 <1.0 <1.0 <1.0 <1.0 25 (s
2ndQtr 6/24/2011 <1.0 <1.0 <1.0 <1.0 24 1.4
3rd Qtr 8/16/2011 <1.0 <1.0 <1.0 <1.0 33 2.6
t~@lhI) 1:::~~gg ::g :::g ····················· 1H;------t:):g;-------,l-------i}B ::~
2nd Qtr ---6/14/2012 <1.0 ---------<1.0 ----<1.0 ------<1.0 ---------35 -----------3.3
3rd Qtr 8/29/2012 <1.0 <1.0 <1.0 <1.0 37 3.9
4thQtr 10/3/2012 <1.0 <1.0 <1.0 <1.0 37 3.9
1s1O1r 21112ofa' <1.0 <1.0 <1.0 <1.0 35.2 ,i:'s
2nd Ctr 5/29/2013 <1.0 <1:0 <1.0 <1.0 38.6 4.4
3rd Qtr 8/29/2013 <1.0 <1.0 <1.0 <1.0 37.6 4.51 ;:g: :g~~iU·1H ·1·:g :::g :-:,~g-------+-----~~,~ :;i
2nd Qtr 5/21/2014 <1.0 <1.0 <1.0 <1.0 32.5 4.87
3rdQtr 8/13/2014 <1.0 <1.0 <1.0 <1.0 38 4.1 ;:g:; ,~~~~g:: ::g <,.o ,.1 :::g~---➔~·H-----------~!=~=~+--------""'~j~
2ndQtr 6/10/2015 <1.0 1.82 <1.0 <1.0 41.8 3.55
3rd Qtr 9/3/2015 <1.0 <1.0 <1.0 <1.0 42.4 2.77
4th Qtr 10/23/2015 <1.0 1.46 <1.0 <1.0 40.6 2.45
1stQtr 3/1612016 <1.0 4.49 <TO 2.18 42.4 i.-94
2ndQtr 5/26/2016 <1.0 6.15 <1.0 3.18 43.6 2.45
3rdQtr 8/3/2016 <1.0 5 <1.0 1.8 42.4 2.88
4th Qtr 10/20/2016 <1.0 7.02 <1.0 1.59,_ _____ 45.6 2.86
1s1Qtr 3/15/2017 <1.0 6.45 <1.0 2.i'ii 4's:4 f35
2ndQtr 6/15/2017 <1.0 6.85 <1.0 <1.0 46.9 5.12
3rdQtr 812/2017 <1.0 6.14 <1.0 <1.0 46.4 4.84
4thQtr 10/10/2017 <1.0 6.13 <1.0 ____ -1<1.0~---~------~42.5 4.73 1st'Qtr ···············311512018 <1.0 5.8 <1.0 2.18 5'f5 s':iii
2ndQlr 6/13/2018 <1.0 5.12 <1.0 <1.0 46.9 6.36
3rdQtr 8/30/2018 <1.0 4.76 <1.0 <1.0 54.1 5.34
4th Qtr 12/12/2018 <1.0 4.41 <1.0 <1.0 48.7 5.85
1stQtr 3/16/2019 <1.0 4.08 <1.0 <1.0 4ti:7 a.i's
2ndQtr 6/13/2019 <1.0 4.18 <1.0 <1.0 48.3 5.86
3rd Qtr 9/11/2019 <1.0 6.08 <1.0 <1.0 45.4 4.77
4th Qtr 12/1412019 <1.0 3.83 <1.0 <1.0 49.4 4.76
1st Ctr 3/17/2020 <1.0 2.98 ·•1.0 <1.0 48:4 6.17
2nd Qtr 6111/2020 <1.0 2.87 <1.0 <1.0 47.6 6.57
3rd Qtr 9/18/2020 <1.0 2.41 <1.0 <1.0 45.1 5.57
4thQtr 11/4/2020 <1.0 2.69 <1.0 <1.0 49.7 5.81
·11ii'air 3118120:H ·•1.0 1.11 <1.0 <1.0 4'ii':2 s':ss
2nd Qtr 6/16/2021 <1.0 <1.0 <1.0 <1.0 49.5 7.02
3rdQtr 9/15/2021 <1.0 <1.0 <1.0 <1.0 34.1 5.56
4th Qtr 12/8/2021 <1.0 <1.0 <1.0 <1.0 49.0 5.70
·1si'air 3Ji'si2022 <1.0 <1.0 <1.0 <1.0 42.0 5.9
2nd Qtr 6/16/2022 <1.0 1.0 <1.0 <1.0 48.4 5.30
3rd Qtr 9/14/2022 <1.0 1.1 <1.0 <1.0 42.2 4.78
4th Qtr 12/8/2022 <1.0 <1.0 <1.0 <1.0 43.5 6.20
(1) As of March 2012 both north and south wild life ponds no lo~er receIvIn2,._water
NS = not sampled
Shaded indicates concentrations exceeding GWQS.
TW4-16
Sampling Event
TABLE 1 (18 of 33)
Historic Summary Of Monitoring Well Analytical Results Up To The 4th Quarter 2022
Chloroform Contamination Investigation
DUSA White Mesa Mill
Parameter
IGWQSl
Carbon Tetrachloride Chloroform Chloromethane
15 ua/L\ 170 ua/L\ 130 ua/L\
Methylene Chloride
(5 uo/Ll
Chloride
No GWQS (ma/Ll
Nitrate, Nitrate + Nitrite
(10 ma/Ll
1st Qtr 3/16/2005 NA 240 NA
2nd Qtr 5/25/2005 NA 212 NA
3rd Qtr 8/31/2005 <1.0 85
4th atr 12n12005 <1.0 14
1st Qtr 3/9/2006 <1.0 39
2nd Qtr 6/14/2006 <1.0 13
3rd Qtr 7/20/2006 <1.0 5.2 <1.0
4th Qtr 11/8/2006 <1.0 13.6 <1.0
1st Qtr 2/28/2007 <1.0 8.7 <1.0
2nd Qtr 6/27/2007 <1.0 2.6 <1.0
3rdQtr 8/15/2007 <1.0 7.1 <1.0
4th Qtr 10/10/2007 <1.0 1.4 <1.0
1stQtr 3/28/2008 <1.0 11 <1.0
2nd Qtr 6/25/2008 <1.0 <1.0 <1.0
3rd Qtr 9/10/2008 <1.0 10 <1.0
4th Qtr 10/15/2008 <1.0 3.9 <1.0
1st Qtr 3/4/2009 <1.0 <1.0 <1.0
2nd Qtr 6/23/2009 <1.0 <1.0 <1.0
3rd Qtr 9/14/2009 <1.0 <1.0 <1.0
4th Qtr 12/17/2009 <1.0 <1.0 <1.0
1st Qtr 3/24/2010 <1.0 <1.0 <1.0
2nd Qtr 6/14/2010 <1.0 2.1 <1.0
3rd Qtr 8/24/2010 <1.0 4.3 <1.0
4th Qtr 10/15/2010 <1.0 3 <1.0
1stQtr 2/22/2011 <1.0 15 <1.0
2nd Qtr 5/26/2011 <1.0 16 <1.0
3rd Qtr 8/17/2011 <1.0 9.2 <1.0
4th Qtr 11/16/2011 NA NA NA
NA
NA
3.2
2.6
1.1
2.4
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
NA
NA
NA
43 NA
5.9
21
8.9
2.7
9.2
6.6
1.8
5.1
1
26
14
6.6
64
60
55
60
62
79
75
65
69
<0.1
<0.1
<0.1
52 <0.1
58
71
89
73
76
79
76
77
64
72
71
86
81
63
38
1.4
3
1.9
2.7
5.6
12.3
9.9
5.4
4.4
1.5
10.5
9.8
9.6
8.9
8.8
5.2
4.2
4.7
4.6
3.3
7
5
1.7
0.4
lsTOtr!W :~:~~:~ :: ~ :: ~ :: ~ 1 ·4 NA 2nd Qtr -5/26/2012 <1.0 --<fo ____ <fO ______ <1.0 -------1·7 ---------:~ <0.,---------2·!
3rdQtr 8/30/2012 <1.0 <1.0 <1.0 <1.0 59 <0.1
~~ g: 1~~~:~ :: ~ :: ~ :: ~ :: ~ 5;~,-:~~~:~-------1
2nd Qtr 5/30/2013 <1.0 <1.0 <1.0 4.21 49.8 <0.1
3rdQtr 9/5/2013 <1.0 <1.0 <1.0 <1.0 54.4 <0.1
4th Qtr 11nt2013 <1.0 13.4 <1.0 <1.0 56.6 1.37
tstQtr 1/29/2014 <1.0 6.93 <1.0 <1.0 66.8 3.16
2nd Qtr 5/22/2014 <1.0 14.6 <1.0 <1.0 80.7 4.94
3rdQtr(2) 8/14/2014 <1.0 229 <1.0 <1.0 80 5.1
3rd Qtr 9/24/2014 <1.0 371 <1.0 <1.0 NA NA
4th Qtr 10/29/2014 <1.0 387 <1.0 <1.0 92.1 8.4
1st Qtr 3112/2015 <1.0 153 <1.0 <1.0 65 4.3
2nd Qtr 6/11/2015 <1.0 65.3 <1.0 <1.0 61 1.06
3rd Qtr 9/3/2015 <1.0 82 <1.0 <1.0 65.8 1.18
4thQtr 10/28/2015 <1.0 112 <1.0 <1.0 58.3 1.69
1stQtr 3/17/2016 <1.0 ~ <1.0 <1.0 56.5 1.63
2nd Qtr 5/26/2016 <1.0 93.4 <1.0 <1.0 61 .3 1.89
3rd Qtr 8/3/2016 <1.0 49 <1.0 <1.0 60 2.20
4th Qtr 10/26/2016 <1.0 92.9 <1.0 <1.0 66.7 2.78
tstQtr 3/16/2017 <1.0 19.1 <1.0 <1.0 62.2 2.75
2nd Qtr 6/20/2017 <1.0 64.3 <1.0 <1.0 60.6 1.81
3rdQtr 8/3/2017<1.0 143 <1.0 <1.0 67.1 2.63
4th Qtr 10/11/2017 <1.0 98 <1.0 <1.0 54.2 2.12
DWMRCsolitsamole <0.95 92 <1.5 1.9 J 64 2.00
·1stQtr 3/20/2018 <1.0 170 <1.0 <1.0 85.1 4.55
DuplicateTW4-75 <1.0 171 <1.0 <1.0 84.7 4.51
2nd Qtr 6/14/2018 <1.0 54.5 <1.0 <1.0 62.5 2.83
3rd Qtr 8/30/2018 <1.0 54.5 <1.0 <1.0 73 2.53 ~~~ g:; ,t:~;~~l! :: ~ !~~-i::,.,:~.~i-------+:°':~.~~-----1--------'~~8~•~!-J-------~~~!
2nd Qtr 6/19/2019 <1.0 76.2 <1.0 <1.0 71 .5 2.43
3rd Qtr 9/12/2019 <1.0 99.8 <1.0 <1.0 72.9 3.55
4th Qtr 12/14/2019 <1.0 94.3 <1.0 <1.0 88.6 3.37
DuolicateTW4-75 <1.0 91.0 <1.0 <1.0 84.1 3.12
"fst Qtr 3/18/2020 <1.0 113 <1.0 <1.0 76.2 3.91
2nd Qtr 6/12/2020 <1.0 141 <1.0 <1.0 79.7 4.44
3rd Qtr 9/19/2020 <1.0 220 <1.0 <1.0 77.4 4.74
4th Qtr 11/11/2020 <1.0 270 <1.0 <1.0 85.9 5.73
DuplicateTW4-75 <1.0 277 <1.0 <1.0 85.6 5.74
DWMRCsolitsamole <10 290 <20 <20 87.0 0.37 H
1st Qtr 3/24/2021 <1.0 248 <1.0 <1.0 92.6 5.82
2ndQtr 6/17/2021 <1.0 247 <1.0 <1.0 87.4 6.74
3rdQtr 9/23/2021 <1.0 202 <1.0 <1.0 77.4 4.74
4th Qtr 12/8/2021 <1.0 189 <1.0 <1.0 89.9 4.85
1st Ctr 3/23/2022 <1.0 150 ·;;,·_o <1.0 84.3 5.0
2nd Qtr 6/22/2022 <1.0 120 <1.0 <1.0 93.2 4.2
3rd Qtr 9/15/2022 <1.0 138 <1.0 <1.0 89.8 4.41
4th Qtr 12/9/2022 <1.0 152 <1.0 <1.0 91 .0 4.75
(1) voes were res am pied because laboratory missed holding time.
(2) voes were resampled
(3) As of March 2012 bOth north and south wild life ponds no longer receiving water. NA::notanatyzed ___ -
Shaded indicates concentrations exceeding GWQS
J :: Approximate value
H:: Sample was analyzed beyond holding times and may not be accureate concentration.
TABLE 1 (19 of 33)
Historic Summary Of Monitoring Well Analytical Results Up To The 4th Quarter 2022
Chloroform Contamination Investigation
TW4-18
Sampling Event
DUSA White Mesa Mill
Parameter
fGWQSl
Carbon Tetrachloride
15 ua/Ll
Chloroform Chloromethane Methylene Chloride Chloride Nitrate, Nitrate + Nitrite
170 ua/Ll f30 un/LI f5 ua/Ll No GWQS fma/Ll f10 ma/Ll
1st Qtr 3/16/2005 NA 38 NA NA NA 14.1
2nd Qtr 5/25/2005 NA 29.8 NA NA NA 12.9
3rd Qtr 8/31/2005 <1 .0 39 2.8 <1.0 NA 13.3
4th Qtr 12/7/2005 <1 .0 14 1.1 <1.0 41 7.3
1st Qtr 3/9/2006 <1.0 12 1.6 <1.0 36 5.9
2nd Qtr 6/14/2006 <1 .0 12 2.7 <1.0 35 4.7
3rd Qtr 7/20/2006 <1.0 10.8 <1.0 <1.0 35 6.1
i~~ g:; ~;:;~~~+-:'-';".~c-------+----'1=-~•=-~ic:'-';'-'E.~'-----+:'-';-".~'-----~-------';"'6+----------'~"7!.11
2nd Qtr 6/27/2007 <1.0 8 <1.0 <1.0 28 4.9
3rd Qtr 8/15/2007 <1.0 8.9 <1.0 <1.0 32 5.0
4th Qtr 10/10/2007 <1 .0 7.4 <1.0 <1.0 27 4.4
1st Qtr 3/28/2008 <1.0 6.4 <1.0 <1.0 23 0.7
2nd Qtr 6/25/2008 <1.0 5.7 <1.0 <1.0 23 4.6
3rd Qtr 9/10/2008 <1 .0 8 <1.0 <1.0 26 4.9
.. i,_,,~h'-t g=-:"-; __ __,_1.,,0;°'~4"'5;=-~~"'~""~+-:'-';".~c-------+---"'91-'-i!C:'-';'-'E.~'-----+:'-';-".~'-----~f-------'~"'~ ~.~
2nd Qtr 6/23/2009 <1 .0 16 <1.0 <1.0 30 6.2
3rd Qtr 9/14/2009 <1 .0 13 <1.0 <1.0 26 5.9
1'4,_,,th'-Q=-t,,_r __ _,172/=-17"/=-20,,,0c;9+<'-'1"-!.0c--_____ + ___ 8"'.=-2i..;<:.,1'-'E.0'-----+<'-'1'-'E.0'-----~-------'30 5.4
1stQtr 3/24/2010 <1 .0 69 <1.0 <1.0 ,j"f 5.1
2nd Qtr 6/14/2010 <1 .0 29 <1.0 <1.0 35 9.0
3rd Qtr 8/12/2010 <1 .0 29 <1.0 <1.0 37 9.0
4th Qtr 10/15/2010 <1 .0 30 <1.0 <1.0 50 10.0
1stQtr 2/2212011 <1.0 39 <1.0 <1.0 52 10.0
2ndQtr 5/26/2011 <1 .0 26 <1.0 <1.0 36 9.0
3rdQtr 8/17/2011 <1.0 29 <1.0 <1.0 23 4.6
4th Qtr 11/16/2011 NA NA NA NA 23 6.3
lsfOiim ;~;~~]~ :: ~ ~~ :: ~ :; ~ ~--------1s"~-"A-'-_-_-_-_-_-_-_-_-_-_-4-.!-1
2nd Qtr ---6/13/2012 <1 .0 -----24 <1.0 ------<1.0 -------30 6.6
3rdQtr 9/11/2012 <1 .0 38 <1.0 <1.0 26 6.6
4th Qtr 10/3/2012 <1.0 30 <1.0 <1.0 27 6.0
1stQtr 2/13/2013 <1.0 34.9 <1.0 <1.0 23.1 5.6
2ndQtr 6/13/2013 <1 .0 37.9 <1.0 <1.0 22.9 8.9
3rd Qtr 9/5/2013 <1 .0 41 <1.0 <1.0 36.2 12.1
4th Qtr 11/13/2013 <1.0 44.3 <1.0 <1.0 37.1 14.2
1stQtr 1/30/2014 <1 .0 6.93 <1.0 <1.0 38.9 12.8
2ndQtr 5/22/2014 <1.0 6.93 <1.0 <1.0 47 12.2
3rd Qtr 8/14/2014 <1 .0 32.8 <1.0 <1 .0 49 9.8
i~~g:; 1~:~t~~H'+:-=-;"•~c-------+----;;~:;~ :;~ :~: ]])
2ndQtr 6/11/2015 <1.0 30.5 <1.0 <1.0 43.5 9.69
3rd Qtr 9/3/2015 <1.0 28.7 <1.0 <1.0 47.6 15.7
4th Qtr 10/28/2015 <1 .0 52.9 <1.0 <1.0 39.4 6.24
1st Qtr 3/17/2016 <1 .0 56.6 <1.0 <1.0 40.7 5.96
2ndQtr 6/8/2016 <1 .0 60 <1.0 <1.0 43.8 5.45
3rd Qtr 8/3/2016 <1 .0 56.3 <1.0 <1 .0 40.7 5.79
4thQtr 10/26/2016 <1.0 60.1 <1.0 <1.0 43.9 5.24
1stQtr 3/16/2017 <1 .0 62 <1.0 <1.0 39.4 4.47
0uplicateTW4-75 <1.0 61.5 <1.0 <1.0 41 .1 4.41
2ndQtr 6/20/2017 <1 .0 63.8 <1.0 <1.0 41 .6 4.50
3rdQtr 8/3/2017 <1.0 62.8 <1.0 <1.0 40.4 4.24
DuplicateTW4-75 <1.0 62.3 <1.0 <1.0 41 .5 4.31
4th Qtr 10/11/2017 <1.0 62.9 <1.0 <1.0 37.1 4.43
1stQtr 3/15/2018 <1.0 62.3 <1.0 <1.0 44.3 4.32
2nd Qtr 6/13/2018 <1 .0 59.9 <1.0 <1.0 39.5 4.09
3rdQtr 8/30/2018 <1 .0 56.2 <1.0 <1 .0 45.6 3.51
4th Qtr 12/13/2018 <1.0 57.6 <1.0 <1.0 38.2 3.60
1st Qtr 3/19/2019 <1.0 52.8 <1.0 <1.0 37.6 3.85
2nd Qtr 6/19/2019 <1.0 54.2 <1.0 <1.0 39.5 4.01
DuplicateTW4-75 <1.0 54.4 <1.0 <1.0 40.8 2.95
3rdQtr 9/11/2019 <1.0 56.2 <1.0 <1.0 36.8 3.25
4th Qtr 12/18/2019 <1.0 62.0 <1.0 <1.0 42.7 3.02
1stQtr 3/18/2020 <1 .0 57.0 <1.0 <1.0 39.4 3.71
2nd Qtr 6/12/2020 <1.0 58.2 <1.0 <1.0 41.4 3.62
3rdQtr 9/18/2020 <1.0 60.0 <1.0 <1.0 38.7 3.36
4th Qtr 11/11/2020 <1.0 58.6 <1.0 <1.0 39.6 3.67
OWMRCsnlitsamnte <10 56.0 <20 <20 41.0 3.30
1st Qtr 3/18/2021 <1.0 52.0 <1.0 <1.0 41.8 3.61
2nd Qtr 6/16/2021 <1.0 58.2 <1.0 <1.0 41.4 3.62
3rd Qtr 9/22/2021 <1.0 49.9 <1.0 <1.0 29.8 3.37
4th Qtr 12/8/2021 <1.0 57.0 <1.0 <1.0 41.1 3.90
1stQtr 3/23/2022 <1.0 56.0 <1.0 <1.0 39.1 3.4
2ndQtr 6/22/2022 <1.0 62.9 <1.0 <1.0 48.1 3.4
3rdQtr 9/14/2022 <1.0 60.6 <1.0 <1.0 44.7 3.46
4th Qtr 12/9/2022 <1.0 62.6 <1.0 <1.0 44.4 3.60
DuolicateTW4-75 <1.0 67.9 <1.0 <1.0 45.2 3.63
(1) VOCs were resampled because laboratory mlSSed holding time.
(2) As of March 2012 both north and south wild life ponds no longer receiving water.
NA=notanatyzed _______ -----
Shaded indicates concentrations exceeding GWOS.
TABLE 1 (20 of 33)
Historic Summary Of Monitoring Well Analytical Results Up To The 4th Quarter 2022
Chloroform Contamination Investigation
TW4-19
(chlorofrom pumping well
started 4/30/03)
Sampling Event Carbon Tetrachloride
(5 µg/L)
1st Qtr 3/16/2005 NA
2nd Qtr 5/25/2005 NA
3rd Otr 8/31/2005 <5.0
4th Qtr 12/7/2005 <SO
1st Qtr 3/9/2006 <SO
2nd Qtr 6/14/2006 <SO
3rd Otr 7/20/2006 <SO
4th Qtr 11/8/2006
1st Qtr 2/28/2007
2nd Qtr 6/27/2007
3rd Qtr 8/15/2007
4th Otr 10/10/2007
1st Qtr 3/28/2008
2nd Qtr 6/25/2008 <t.0
1.6
1.3
1.9
1.9
2.9
3rd Otr 9/10/2008 8.6
4th Qtr 10/15/2008 12
1st Qtr 3/4/2009 1.2
~~: ~~ ~;~!;~~~~ _______ ,se1~
4th Qtr 12/22/2009 16
1stOtr 2/17/2010 1.3
2nd Qtr 6/14/2010 4.2
3rd Qtr 8/16/2010 4.9
4th Otr 10/15/2010 1.3
1st Qtr 2/17/2011 17
2nd Qtr 617/2011 8.3
3rd Qtr 8/17/2011 2. t
4th Qtr 11/16/2011
DUSA White Mesa Mill
Parameter
(GWQS)
Chloroform Chloromethane Methylene Chloride
(5 µg/Ll (70 µg/Ll (30 µg/L)
2,200 NA
t,200 NA
t ,400 <5.0
2 800 <SO
1,200 <SO
1,100 <SO
1,120 <SO
1 050
1,200 <1.0
1,100 <1.0
1 100 <1.0
1,800 <1.0
1,000 <1.0
3,600 <1.0
4 200 <1.0
1,100 <1.0
990 <1.0
6,600 <1.0
4 700 <1.0
940 <1.0
1,800 <1.0
2,000 <1.0
t 200 <1.0
3,400 <1.0
4,000 <1.0
970 <1.0
NA
NA
<5.0
<SO
<SO
<SO
<SO
2.6 <1.0
<1.0
Did not sample
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
Chloride Nitrate, Nitrate + Nitrite
No GWQS (mall ) (10 ma/L)
NA 5.3
NA 5.7
NA 4.6
81 <0.1
66 4
116 5.2
1n 43
1M 46
1D 4
129
132
131
128
113
124
127
132
43 <0.1
124
144
132
142
146
135
148
148
148
4.1
4
2.2
2.8
35.2
47.8
3.2
2.4
26.7
2
4.4
5.9
2.7
17.0
12.0
3.0
5.0 ,,rnfr !W ]t£i;~~]~ ~; 2 ~~~ ;] ~ ;] ~ 133 o.6
2ndQtr ----6/6/2012 t.t 460 <1.0 --<t.O ____ --------149 2.4
3rd Qtr 9/4/2012 3.5 950 <1.0 <1.0 149 2.5
4th Qtr 10/3/2012 4 1500 <1.0 <1.0 150 4.1
1stOtr 2/13/2013 5.15 4,210 <1.0 <1.0 164 8.0
2nd Otr 6/5/2013 5.15 2,070 <1.0 <1.0 148 ____ 3.0
3rd Qtr 9/3/2013 20.7 8,100 <t.0 <1.0 179 17.6
4th Qtr 10/29/2013 6.42 942 <1.0 <1.0 134 4.7
1stOtr 1/27/2014 4.05 566 <1.0 <1.0 134 1.6
2nd Otr 5/19/2014 5.51 810 <1.0 <1 .0 152 1.3
3rdQtr 8/11/2014 1.9 1,410 8.3 <1.0 140 1.6
1~4~th'cOc't~r __ ~1cc:0/c'c2~1/cc'20"'1"'4+---------=-4S.8f---__ 4;,3"'1"'0t-<-st-s.0,------+<--ct~.0;--_____ f---_____ "'"t3"'0c+------------=4-c.-=l7 1st Qtr 3/9/2015 8.9:i. 4,660 <1.0 <1.0 238 8.56
2nd Qtr 6/8/2015 2.62 1,570 <1.0 <1.0 180 0.916
3rdQtr 8/31/2015 <t.0 7,860 7.78 <t.0 326 11.6
4thOtr 10/19/2015 12.2 7840 5.46 <1.0 252 10.6
tstQtr 3/9/2016 13.5 7,780 1.4 <1.0 276 15.70
2nd Qtr 5/26/2016 23. t 12,600 <1.0 <1.0 204 1 .27
3rd Qtr 7/25/2016 9.89 6,040 <1.0 <1 .0 214 10.5
4th Otr 10/13/2016 10.8 6 640 <1.0 <1.0 200 10.0
1stOtr 3/8/2017 3.06 1,240 <1.0 <1 .0 461 11.1
2ndOtr 6/13/2017 1.35 510 <1.0 <1 .0 135 0.243
3rd Qtr 7/26/2017 13.0 8,840 <1.0 <1.0 218 1.120
4th Qtr 10/11/2017 <1.0 129 <1.0 <1.0 139 0.377
1stOtr 3/12/2018 1.36 2,640 <1.0 <1.0 193 8.6
2nd Qtr 6/8/201,8 3.45 2,980 <1.0 <1.0 138 0.494
3rdQtr 8/30/2018 2.03 1,910 <1.0 <1.0 166 2.55
4thOtr 11/28/2018 -W 5270 <1.0 <1.0 140 0.233
~~~~:r :;:;~~:~ -----""~s4
~ 1~:~~~ ::~ :;~ :~b ~:
3rd Qtr 9/4/2019 10.1 6,670 <1.0 <1.0 153 0.33
4th Qtr 12/10/2019 <1.0 551 <1.0 <1.0 147 0.535
tstQtr 2/19/2020 13.7 8,720 5.41 <1.0 205 10.1
2ndQtr 5/27/2020 10.4 7,600 <1.0 <1.0 147 1.14
3rdQtr 9/4/2020 1.98 1,350 <1.0 <1.0 188 11 .6
4th Qtr 10/28/2020 1.1 660 <1.0 <1.0 104 1.1
1stQtr 2/23/2021 8.4 6,660 5.41 <1.0 167 6.6
2nd Otr 6/9/2021 <1.0 775 <1.0 <1.0 115 4.04
3rdQtr 8/24/2021 -rn 4.450 1.98 1.25 1721______ 6.68
4thQtr 12/1/2021 13.2 6950 <1.0 <1.0 184 11 .0
1stOtr 3/9/2022 <1.0 654 <1.0 <1.0 119 1.7
2nd Qtr 6/8/2022 2.7 2,540 4 <1.0 128 1.4
3rd Qtr 8/30/2022 2.5 4,750 <1.0 <1.0 178 4.76
4thQtr 11/30/2022 8.0 7380 <1.0 <1.0 129 3.6
(1) VOCs were resampled because laboratory m1SSed holding bme
(2) As of March 2012 both north and south wild life ponds no longer receiving water. _____ _
NA= not analyzed
Bold and italics indicates the MDL exceeded the GWQS.
Shaded indicates concentrations exceeding GWQS.
TABLE 1 (21 of 33)
Historic Summary Of Monitoring Well Analytical Results Up To The 4th Quarter 2022
Chloroform Contamination Investigation
OUSA White Mesa Mill
TW4-20 Parameter
(chloroform pumping well (GWQS) started 8/4/05)
Sampling Event Carbon Tetrachloride Chloroform Chloromethane Methylene Chloride
IS ua/Ll 170 ua/Ll 130 ua/Ll IS ua/L)
1stQtr 3/16/2005 Monitor well was not installed
2nd Qtr (3) 5/25/2005 NA 39,000 NA NA
3rd Qtr ----8/3112005 <10 ---1:soo <10 _______ <10 ------
4thQtr 12n/2005 <250 19 000 <250 <250
1stQtr 3/9/2006 <500 9,200 <500 <500
2nd Qtr 6/14/2006 <500 61,000 <500 <500
3rd Qtr 7/20/2006 <1000 5,300 <1000 <1000
4th Qtr 11/8/2006 7.1 11 000 1.9 2.2
1stQtr 2/28/2007 3.1 4.400 <1.0 1.1
2nd Qtr 6127/2007 2.2 1.800 <1.0 <1.0
3rd Qtr 8/1512007 3.5 5.200 <1.0 1.8
4thQtr 10/10/2007 6.8 9000 <1.0 1.9
1stQtr 312812008 9 13,000 <1.0 1.5
2ndQtr 6/2512008 13 30,000 <1.0 1.2
3rdQtr 9/10/2008 15 21,000 <1 .0 3.7
4thQtr 10/15/2008 NA NA NA NA
1st0tr 3/4/2009 5.7 8,200 <1 .0 5.2
2ndQtr 6/23/2009 4.9 6.800 <1.0 4.2
3rdQtr 9/14/2009 8.4 13,000 <1·.o· 4.4
4th Qtr 12122/2009 14 15 000 <1.0 3.0
1stQtr 2ti°712010 2.7 3.500 <1.0 3.2
2nd Qtr 6/14/2010 11 18,000 <1 .0 3.7
3rdQtr 8/16/2010 12 15.000 <1 .0 2.2
4thQ1r 10/1512010 20 24 000 <1 .0 5.5
1st Qtr 2/17/2011 27 31,000 <1.0 19.0
2nd Qtr 617/2011 10 8,100 <1 .0 2.1
3rd Qtr 8/17/2011 7.3 3,800 <1 .0 3.1
4thQtr 11/16/2011 7.2 7 900 <1.0 2.5
1st 0 tr(2) 1/23/2012 10 11,000 <1.0 1.3
2nd Qtr ----6/6/2012 ----------33 ---36:0lio <TO ______ <1.0 ________
3rdQtr 9/4/2012 26 13.000 <1.0 <1.0
4th Qtr 10/3/2012 22 19 000 <1.0 <1.0
1stQtr 2/11/2013 19.6 18.500 <1.0 1.21
2nd Ctr 6/5/2013 32.5 26.300 <1.0 1.3
3rd Ctr 9/3/2013 25.7 26.800 <1.0 2.14
4thQtr 10129/2013 17.3 15 700 <1.0 1.37
1st Ctr 112712014 18.4 17,800 <1.0 2.04
2ndQtr 5/1912014 22.1 22.100 2.31 3.98
3rd Qtr 8/1112014 14.1 12.400 55.2 2.2
4thQtr 1012112014 18.5 23 300 4.04 2.38
1stQtr 3/912015 20.8 fa.900 4.85 1.38
2ndQtr 6/8/2015 16.2 17,600 13.4 1.73
3rd Qtr 8/31/2015 15.1 17,000 12.3 <1.0
4th Qtr 10/19/2015 14.5 17 000 10.8 1
1stQtr 3/9/2016 20.2 21,600 4.09 1.16
2nd Qtr 5/23/2016 40.6 33,700 <1.0 <1.0
3rd Q1r 7/25/2016 26.6 23,600 <1.0 <1.0
4thQtr 10/12/2016 24.4 21 300 <1.0 <1.0
1stOtr 3/8/2017 23.5 23,400 <1.0 <1.0
2nd Qtr 6/13/2017 23.4 18,100 <1.0 <1.0
3rdQtr 7126/2017 25.0 27,600 1.25 <1.0
4thQtr 10/12/2017 11.2 11 600 2.34 <1.0
1stQtr 3/1212(fi°8 15.9 15.400 1.77 2.36
2nd Qtr 6/1412018 <1.0 12,000 <1.0 7.77
3rd Qtr 8/2212018 9.85 10,500 4.98 <1.0
41hQtr 11/28/2018 8.32 9 500 15.6 <1.0
1stQtr 3/812019 15.4 15.600 <1.0 <1.0
2ndQtr 6/512019 10.1 13,700 <1.0 <1.0
3rd Qtr 9/4/2019 8.39 10.500 <1.0 <1.0
4th Qtr 12/10/2019 5.92 8 790 2.67 <1 .0
1stQtr 2/19/2020 8.6 14.300 10.7 <1 .0
2ndQtr 5/27/2020 6.74 5.800 1.3 12.3
Well TW4-20 Abandoned in October 2020
(1) VOCs were resampled because laboratory missed holding time.
(2) As of March 2012 both north and south wild life ponds no longer receiving water.
J3) Chloroform~um~'!S well started 8/4/05
NA = not analyzed
Bold and italics indicates the MDL exceeded the GWQS
Shaded indicates concentrations exceeding GWOS.
Chloride
No GWQS lma/Ll
NA
NA --------
131
120
235
134
124
124
112
117
170
132
191
156
168
164
164
153
187
179
200
196
203
220
177
207
186
207
--------262
289
302
252
250
260
272
254
269
299
292
290
296
365
293 iii:i
318
307
301
290
281
292
293
289
258
282
295
272
279
286
307
310
3.01
Nitrate, Nitrate + Nitrite
110 ma/Ll
10.10 ___________ ,;,,
2.90
1.80
3.80
9.40
2.90
3.50
4.20
2.30
2.10
5.60
0.90
8.00
4.44
5.51
· 5.10
2.90
3.30
5.30
2.00
5.60
5.30
4.60
4.40
4.80
6.50
4.20
7.90 ----------1 fo6
10.80
11 .00
9.07
9.80
8.65
9.64
7.56
5.95
4.30
7.67
9.80
5.76
9.3
6.23
10.30
11.2
11.3
11.4
12.0
9.76
10.8
8.91
9.5
10.40
8.14
9.72
6.7
9.59
10.20
9.75
9.81
7.23
TABLE 1 (22 of 33)
Historic Summary Of Monitoring Well Analytical Results Up To The 4th Quarter 2022
Chloroform Contamination Investigation
DUSA White Mesa Mill
TW4-21 Parameter
(chloroform pumping well (GWQS)
619/15)
Sampling Event Carbon Tetrachloride Chloroform Chloromethane Methylene Chloride
15 ua/L\ 170 ua/L\ 130 ua/L\ csuo/Ll
1st0tr 3/16/2005 Monitor well was not installed
2nd Qtr 5/25/2005 NA 192 NA
3rdQtr 8/31/2005 <5.0 78 <5.0
4th Qtr 12fi/2005 <1.0 86 <1.0
1stQtr 3/9/2006 <2.5 120 <2.5
2nd Qtr 6/14/2006 <2.5 120 <2.5
3rdQtr 7/20/2006 <2.5 108 <2.5
4th Qtr 11/8/2006 2 139 <1.0
1stQtr 2/28/2007 1.8 160 <1.0
2nd Qtr 6/27/2007 5.8 300 <1.0
3rdQtr 8/15/2007 <1.0 140 <1.0
4th Qtr 10/10/2007 <1.0 120 <1.0
1stQtr 3/28/2008 7 390 <1.0
2nd Qtr 6/25/2008 1.7 180 <1.0
3rdQtr 9/10/2008 1.6 120 <1.0
4th Qtr 10/15/2008 NA #NIA NA
11/18/2008 2 170 <2.0
1stQtr 3111/2009 <1.0 180 <1.0
2ndQtr 6/2312009 <1.0 200 <1.0
3rdQtr 911412009 <1.0 200 <1.0
4th Qtr 12/22/2009 <1.0 160 <1.0
1stQtr 2/25/2010 <1.0 170 <1.0
2ndQtr 6/1412010 <1.0 210 <1.0
3rd Qtr 8/13/2010 9.2 390 <1.0
4th Qtr 10/1512010 1.2 200 <1.0
1stQtr 2/22/2011 1.2 230 <1.0
2nd Qtr 6/2812011 4.8 290 <1.0
3rdQtr 8/1712011 6.3 460 <1.0
4th Qtr 11/1612011
isiCifr(w :~2~;~~!!
6.7 390 <1.0
6.4 420 <1.0
2nd Qtr ----6/612012 5.4 ----400 <TO ______
3rd Otr 9/412012 6 410 <1.0
4thQtr 10/3/2012 7 390 <1.0
1stQtr 2/1112013 5.25 282 <1.0
2ndQtr 6/512013 3.49 328 <1.0
3rd Qtr 9/312013 2.13 244 <1.0
4thQtr 10/2912013 <1.0 204 <1.0
1stQtr 1/2712014 6.23 220 <1.0
2nd Qtr 5/19/2014 4.73 240 <1.0
3rdQtr 8/1112014 <1.0 204 <1.0
4th Qtr 10/2112014 1.04 229 <1.0
1stQtr 31912015 1.75 292 <1.0
2nd Qtr (3) 6/812015 1.92 366 <1.0
3rd Qtr ____ 8/3112015 <1.0 -----------1si <1.0 ______
4thQtr 10/1912015 <1.0 339 <1.0
1stQtr 3/9/2016 <1.0 390 <1.0
2ndQtr 5/23/2016 <1.0 545 <1.0
3rd Qtr 7/25/2016 <1.0 456 <1.0
4th Qtr 10/12/2016 <1.0 456 <1.0
1stQtr 3/8/2017 2.36 598 <1.0
2ndQtr 6/13/2017 1.16 224 <1.0
3rd Qtr 7/2612017 1.05 537 <1.0
4th Qtr 10/11/2017 <1.0 466 <1.0
DWMRC solit sam le <3.8 400 <6.0
1stQtr 3/12/2018 2.36 421 ·<1.0
2ndQtr 6/8/2018 <1.0 532 <1.0
3rd Qtr 8/22/2018 <1.0 476 <1.0
4th Qtr 10/22/2018 <1.0 585 <1.0
1stQtr 3/8/2019 <1.0 323 <1.0
2ndQtr 615/2019 <1.0 734 <1.0
3rd Qtr 9/412019 <1.0 596 <1.0
4thQtr 12/10/2019 <1.0 794 <1.0
1stQtr 2/1912020 <1.0 844 2.58
2ndQtr 5/2712020 <1.0 767 <1.0
3rd Qtr 9/412020 <1.0 920 <1.0
4thQtr 10/28/2020 <1.0 948 <1.0
1stQtr 2/23/2021 <1.0 400 <1.0
2ndQtr 6/9/2021 <1.0 1,130 <1.0
3rd Qtr 8/2412021 <1.0 669 <1.0
4th Qtr 12/1/2021 <1.0 649 <1.0
tstQtr 3/912022 <1.0 469 <1.0
2ndQtr 6/812022 <1.0 657 <1.0
3rd Qtr 8/3012022 <1.0 1,070 <1.0
4thQtr 11/30/2022 <1.0 482 <1.0
(1) voes were resampled because laboratory missed holding time.
(2) As of March 2012 both north and south wild life ponds no longer receiving water. .
]~~§2!o.!..mpumpmgwellstarted6°i9/15 ------------------------
NA = not analyzed
Shaded indicates concentrations exceeding GWQS.
J = Approximated value
NA
<5.0
<1.0
<2.5
<2.5
<2.5
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
NA
<2.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0 <1.0 --------
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
2.04
2.04
<1.0
<1.0
<1.0
<1.0
<1.0 -------
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
14 J
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
Chloride
No GWQS lmo/Ll
NA
NA
353
347
318
357
296
306
327
300
288
331
271
244
284
NA
279
291
281
256
228
266
278
210
303
290
287
287
228 --------285
142
270
221
243
207
206
200
243
230
252
255
--------494 499
413
452
425
457
439
452
309
447
378
310
447
387
182
392
180
456
478
339
446
353
382
411
454
461
375
227
110
331
425
158
Nitrate, Nitrate + Nitrite
110mn/L\
14.6
10.1
9.6
8.5
10.2
8.9
8.7
8.7
8.6
8.6
8.3
14.3
8.8
7.57
8.0
#NIA
8.3
8.1
9.2
8.4
8.4
12.0
14.0
7.0
9.0
12.0
14.0
13.0
----------1?,0 11.0
13.0
14.0
11.8
13.8 ,_ 10.3
9.0
11.4
11.5
7.1
10.0
10.9
----------1J.1 14.7
14.3
14.6
13.1
16.5
13.5
17.7
9.53
18.20
16.90
11
15.8
14.1
0.236
15.2 -~ 17.5
14.7
5.73
8.93
15.4
12.6
16.3
15.20
21.5
12.9
17.2
2.2
8.9
14.3
2.12
TABLE 1 (23 of 33)
Historic Summary Of Monitoring Well Analytical Results Up To The 4th Quarter 2022
Chloroform Contamination Investigation
OUSA White Mesa Mill
TW4-22 Parameter
(nitrate pumping well started (GWQS)
1/26113)
Sampling Event Carbon Tetrachloride Chloroform Chloromethane Methylene Chloride
15 ua/LI 170 un/L\ 130 un/L\ 15 ua/LI
1stQtr 3/16/2005 Monitor well was not installed
2nd Qtr 5/25/2005 NA 340 NA NA
3rdQtr 8/31/2005 <5.0 290 <5.0 <5.0
4th Qtr 12/7/2005 <5.0 320 <5.0 <5.0
1stQtr 3/9/2006 <10 390 ·:t10 <10
2nd Qtr 6/14/2006 <10 280 <10 <10
3rdQtr 7/20/2006 <10 864 <10 <10
4th Qtr 11/8/2006 <1.0 350 1.6 <1.0
1s!Qtr 2/28/2007 <1.0 440 <1.0 <1.0
2nd Qtr 6/27/2007 <1.0 740 <1.0 <1.0
3rdQtr 8/15/2007 <1.0 530 <1.0 <1.0
4th Qtr 10/10/2007 <1.0 440 <1.0 <1.0
1stQtr 3/28/2008 <1.0 1.400 <1.0 <1.0
2nd Qtr 6/25/2008 <1.0 1.200 <1.0 <1.0
3rdQtr 9/10/2008 1.3 6.300 <1.0 <1.0
4th Qtr 10/15/2008 NA #N/A NA NA
11/18/2008 <2.0 630 <2.0 <2.0
1stQtr 3/11/2009 <1.0 390 <1.0 <1.0
2nd Qtr 6/23/2009 <1.0 730 <1.0 <1.0
3rdQtr 9/14/2009 <1.0 2,300 <1.0 <1.0
4th Qtr 12/29/2009 <1.0 380 <1.0 <1.0
1stQtr 3/23/2010 <1.0 2,200 <1.0 <1.0
2nd Qtr 6/14/2010 <1.0 540 <1.0 <1.0
3rdQtr 8/24/2010 <1.0 340 <1.0 <1.0
4thQtr 10/15/2010 <1.0 340 <1.0 <1.0
1stQtr 2/22/2011 1.2 1,300 <1.0 <1.0
2nd Qtr 6/1/2011 <1.0 210 <1.0 <1.0
3rdQtr 8/17/2011 <1.0 450 <1.0 <1.0
4th Qtr 11/16/2011 NA #N/A NA NA
lstotr!W ·-\~~gu <1.0 400 <1.0 <1.0
<1.0 200 <1.0 <1.0
2nd Qtr ---6/13/2012 <1.0 -------------,20 <TO ______ <1.0 --------
3rdQtr 9/12/2012 <1.0 121 <1.0 <1.0
4thQtr 10/4/2012 <1.0 330 <1.0 <1.0
1st Qtr (3) -2/11/2013 3.24 ---w:soo <1.0 ______ <1.0 --------
2ndQtr 6/5/2013 3.35 12,500 <1.0 <1.0
3rd Qtr 9/3/2013 3.25 9.640 <1.0 <1.0
4thQtr 10/29/2013 8.09 13 300 <1.0 <1.0
1stQtr 1/27/2014 6.06 12,100 <1.0 2.83
2ndQtr 5/19/2014 6.65 12.400 <1.0 <1.0
3rdQtr 8/11/2014 1.9 12.400 40 <1.0
4thQtr 10/29/2014 3.32 12 400 1.61 <1.0
1stQtr 3/9/2015 3.77 12,700 4.31 <1.0
2ndQtr 6/8/2015 2.42 8,050 3.42 <1.0
3rd Qtr 8/31/2015 <1.0 7,810 5.47 <1.0
4thQtr 10/19/2015 3.32 7 530 5.1 <1.0
1stQtr 3/9/2016 <1.0 6,070 <1.0 <1.0
2ndQtr 5/23/2016 2.64 8.570 <1.0 <1.0
3rdQtr 7/25/2016 <1.0 5,840 <1.0 <1.0
4thQtr 10/12/2016 1.08 3 370 <1.0 <1.0
1stQtr 3/8/2017 1.56 5,320 <1.0 <1.0
2nd Qtr 6/13/2017 1.21 3,670 <1.0 <1.0
3rd Qtr 7/26/2017 <1.0 5,150 <1.0 <1.0
4thQtr 10/11/2017 <1.0 4.770 <1.0 <1.0
OWMRC split samee <38 4 100 <60 150 J
1stQtr 3/12/2018 <1.0 4,530 <1.0 <1.0
2ndQtr 6/8/2018 <1.0 3,010 <1.0 <1.0
3rd Qtr 8/22/2018 <1.0 3,600 <1.0 <1.0
4th_Q1r 11/28/2018 <1.0 2 680 <1.0 <1.0
1stQtr 3/8/2019 1.02 4,310 <1.0 <1.0
2ndQtr 6/5/2019 1.13 4,690 <1.0 <1.0
3rd Qtr 9/4/2019 <1.0 3.460 <1.0 <1.0
4thQtr 12/10/2019 <1.0 3 820 <1.0 <1.0
1stQtr 2/19/2020 1.02 3,910 <1.0 <1.0
2nd Qtr 5/27/2020 <1.0 2,530 <1.0 <1.0
3rdQtr 9/4/2020 <1.0 3,760 <1.0 <1.0
4thQtr 10/28/2020 6.83 3 640 <1.0 <1.0
1stQtr 2/23/2021 <1.0 5,100 <1.0 <1.0
2nd Qtr 6/9/2021 <1.0 4,520 <1.0 <1.0
3rd Qtr 8/24/2021 <1.0 3,510 <1.0 <1.0
4thQtr 12/1/2021 <1.0 3 330 <1.0 <1.0
1stQtr 3/9/2022 <1.0 3,320 <1.0 <1.0
2nd Qtr 6/8/2022 <1.0 2,600 4.4 <1.0
3rd Qtr 8/30/2022 <1.0 3,190 <1.0 <1.0
4thQtr 11/30/2022 <1.0 2 350 <1.0 1.6
(1) voes were resampled because laboratory mtSSed holding time.
(2} As of March 2012 both north and south wild life ponds no longer receiving water.
(3) Chloroform_pum_e~ well started 1/26/13 -------· NA = not analyzed
Shaded indicates concentrations exceeding GWQS.
Bold and italics indicates the MDL exceeded the GWQS.
J = Approximated value
Chloride
No GWQS Ima/LI
NA
NA
253
236
221
221
236
347
273
259
238
519
271
524
539
NA
177
177
391
175
427
134
130
134
114
138
120
174
NA
36 ---------35
130 --------130
586
487
501
598
614
540
596
675
390
557
567
583
598
619
588
566
572
391
600
610
607
580
613
567
528
662
588
608
606
578
514
523
618
408
410
586
442
564
637
601
Nitrate, Nitrate + Nitrite
110 ma/LI
18.2
15.7
15.1
15.3
14.3
14.5
15.9
20.9
19.3
19.3
18.8
39.1
41.9
38.7
36.3
#NIA
20.7
20.6
40.3
17.8
36.8
19.0
15.0
16.0
18.0
17.0
15.0
19.0
#N/A
14.0 ----------12.8
7.0
----------1:19 58.0
50.2
29.7
45.2
54.6
47.2
41.5
54.9
69.2
47.1
64.7
56.1
31.1
58.4
61.3
61.5
69.8
70.8
66.1
80.1
79.0
62.3
72.5
55.4
75.7
71.9
83.9
72.5
59.9
57.7
60.5
64.8
64.9
69.6
89.3
35.1
68.8
40.4
45.0
69.9
62.0
TABLE 1 (24 of 33)
Historic Summary Of Monitoring Well Analytical Results Up To The 4th Quarter 2022
Chloroform Contamination Investigation
DUSA White Mesa Mill
TW4-23
Sampling Event
Carbon Tetrachloride Chloroform Chloromethane
15 uo/L\ 170 uo/L\ 130 uo/L\
2ndQtr 6/27/2007 <1.0 <1.0 <1.0
3rd Qtr 8/15/2007 <1.0 <1.0 <1.0
4th Qtr 10/10/2007 <1.0 <1.0 <1.0
1stQtr 3/28/2008 <1.0 <1.0 <1.0
2ndQtr 6/25/2008 <1.0 <1.0 <1.0
3rd Qtr 9/10/2008 <1.0 <1.0 <1.0
4th Qtr 10/15/2008 NA NA NA
11/18/2008 <2.0 <2.0 <2.0
1stQtr 3/4/2009 <1.0 <1.0 <1.0
2ndQtr 6/23/2009 <1.0 <1.0 <1.0
3rd Qtr 9/14/2009 <1.0 <1.0 <1.0
41h Qtr 12/16/2009 <1.0 <1.0 <1.0
1stQtr 3/24/2010 <1.0 <1.0 <1.0
2ndQtr 6/14/2010 <1.0 <1.0 <1.0
3rd Qtr 8/24/2010 <1.0 <1.0 <1.0
4th Qtr 10/15/2010 <1.0 <1.0 <1.0
1stQtr 2/16/2011 <1.0 <1.0 <1.0
2ndQtr 6/14/2011 <1.0 <1.0 <1.0
3rd Qtr 8/16/2011 <1.0 <1.0 <1.0
4th Qtr 11/15/2011 <1.0 <1.0 <1.0 tsf'Citi'ji') 1/17/2012 <1.0 <1.0 <1.0
2nd Qtr ---5/31/2012 <1.0 ---------<1.0 ____ <TO ______
3rd Qtr 8/29/2012 <1.0 <1.0 <1.0
4th Qtr 10/3/2012 <1.0 <1.0 <1.0
1stQtr 2n/2013 <1.0 <1.0 <1.0
2ndQtr 5/30/2013 <1.0 <1.0 <1.0
3rd Qtr 9/5/2013 <1.0 <1.0 <1.0
4thQtr 11n/2013 <1.0 <1.0 <1 .0
1stQtr 1/2312014 <1.0 <1.0 <1.0
2ndQtr 5/19/2014 <1 .0 <1.0 <1.0
3rd Qtr 8/13/2014 <1.0 <1.0 <1.0
4thQtr 10128/2014 <1.0 <1.0 <1.0
1stQtr 3/12/2015 <1.0 <1.0 <1.0
2nd Qtr 618/2015 <1 .0 <1.0 <1.0
3rd Qtr 91312015 <1.0 <1.0 <1.0
4thQtr 10/28/2015 <1.0 <1.0 <1.0
DuDlicate TW4-70 <1.0 <1.0 <1.0
r•tQtr 3/1612016 <1.0 <1.0 <1.0
2nd Qtr 5/2612016 <1.0 <1.0 <1.0
3rd Qtr 8/23/2016 <1.0 <1.0 <1.0
Duplicate TW4-70 <1.0 <1.0 <1.0
14th Qtr 10/12/2016 <1.0 <1.0 <1.0
Q1stQtr 3/15/2017 <1.0 <1.0 <1.0
Duplicate TW4-70 <1.0 <1.0 <1.0
12nd Qtr 6/1512017 <1.0 <1.0 <1.0
3rdQtr 81212017 <1.0 <1.0 <1.0
4th Qtr 10/1012017 <1.0 <1.0 <2.0
DWMRC snlit samnle <1.0 <1.0 <2.0
rst Otr 3/1412018 <1.0 <1.0 <1.0
2nd Qtr 6/1312018 <1.0 <1.0 <1.0
Duplicate TW4-70 <1.0 <1.0 <1.0
3rdOtr 8130/2018 .<1.0 <1.0 <1.0
4th Qtr 12/12/2018 <1.0 <1.0 <1.0
1stQtr 3116/2019 <1.0 <1.0 <1.0
2nd Qtr 6113/2019 <1.0 <1.0 <1.0
3rdQtr 9111/2019 <1.0 <1.0 <1.0
4thQtr 12/10/2019 <1.0 <1.0 <1.0
1stQtr 3/17/2020 <1.0 <1.0 <1.0
2nd Qtr 6/11/2020 <1.0 <1.0 <1.0
3rdQtr 9/17/2020 <1.0 <1.0 <1.0
4th Qtr 11/4/2020 <1.0 <1.0 <1.0
1stQtr 3/17/2021 <1.0 <1.0 <1.0
2ndQtr 6116/2021 <1.0 <1.0 <1.0
3rd Q1r 9/15/2021 <1.0 <1.0 <1.0
4th Qtr 12/8/2021 <1.0 <1.0 <1.0
Dunlicate TW4-70 <1.0 <1.0 <1.0
'istQtr 3/22/2022 <1.0 <1.0 <1.0
Duplicate TW4-70 <1.0 <1.0 <1.0
2ndQtr 6/16/2022 <1.0 <1.0 <1.0
3rd Qtr 9/1412022 <1.0 <1.0 <1.0
4th Qtr 12m2022 <1.0 <1.0 <1.0
(1) As of March 2012 both north and south wild life ponds no longer receiving water. NA=not analyzed ___________ ---------
Shaded indicates concentrations exceeding GWQS
J = Approximated value.
Parameter
IGWQSl
Methylene Chloride
15 ua/Ll
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
NA
<2.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0 <1.0 ________
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<2.0
<2.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1 .0
<1.0
<1 .0
<1 .0
<1 .0
<1 .0
<1.0
<1.0
<1.0
Chloride Nitrate, Nitrate+ Nitrite
No GWQS (ma/Ll 110 ma/Ll
47 <0.1
46 <0.1
43 <0.1
41 <0.1
41 <0.1
35 <0.05
51 <0.05
NA NA
41 <0.1
43 <0.1
43 <0.1
37 <0.1
45 <0.1
40 <0.1
40 <0.1
34 <0.1
44 <0.1
44 <0.1
41 <0.1
43 <0.1
40 <0.1
---------44 <0.1 ·-
46 <0.1
45 <0.1
43.6 <0.1
44.7 0.1
48 <0.1
43 <0.1
44.6 <0.1
42.3 <0.1
46 <0.1
46.8 <0.1
47.3 <0.1
48.4 <0.1
54.1 <0.1
46.4 <0.1
46.4 <0.1
49.1 <0.1
50.4 <0.1
49.6 <0.1
48.3 <0.1
52.1 <0.1
47.7 <0.1
49.8 <0.1
51 .5 <0.1
51 .8 <0.1
44.7 <0.1
52 <0.1
53.8 <0.1
47.6 <0.1
47.9 <0.1
56 <0.1
54.9 <0.1
48.9 <0.1
50.2 <0.1
47.9 <0.1
54.4 <0.1
50.0 <0.1
49.0 <0.1
48.8 <0.1
49.3 <0.1
51 .6 <0.1
48.8 <0.1
42.8 <0.1
51 .2 <0.1
53.2 <0.1
43.8 <0.1
39.2 <0.1
42.2 0.10
45.0 <0.1
47.5 <0.1
TW4-24
TABLE 1 (25 of 33)
Historic Summary Of Monitoring Well Analytical Results Up To The 4th Quarter 2022
Chloroform Contamination Investigation
OUSA White Mesa Mill
(nitrate pumping well started
1/26/13)
Sampling Event
Parameter
(GWQS)
Carbon Tetrachloride Chloroform Chloromethane Methylene Chloride Chloride
2ndQtr
3rd Qtr
4th Qtr
1stQtr
2nd Qtr
3rdQtr
4th Qtr
(5 ua/L) (70 ua/L) (30 ua/L) (5 UQ/L) No GWQS {ma/L)
6/27/2007 <1.0 2.6 <1.0 <1.0 770
8/15/2007 <1.0 2.2 <1.0 <1.0 791
10/10/2007 <1.0 1.5 <1.0 <1.0 692
3/28/2008 <1.0 1.5 <1.0 <1.0 740
6/25/2008 <1.0 1.4 <1.0 <1.0 834
9/10/2008 <1.0 2.9 <1.0 <1.0 1,180
10/15/2008 NA #NIA NA NA 1,130
Nitrate, Nitrate + Nitrite
110ma/Ll
26.1
29
24.7
24.4
45.3
38.4
44.8
11/18/2008 <2.0 <2.0 <2.0 <2.0 #N/A #N/A
1stQtr 3/4/2009 <1.0 1.4 <1.0 <1.0 1,010
2nd Qtr 6/23/2009 <1.0 1.5 <1.0 <1.0 759
3rdQtr 9114/2009 <1.0 1.4 <1.0 <1.0 618
4thQtr 12/16/2009 <1.0 1.2 <1.0 <1.0 1 080
1stQtr 3/25/2010 <1.0 1.3 <1.0 <1.0 896
2ndQtr 6/14/2010 <1.0 1.7 <1.0 <1.0 639
3rd Qtr 8/24/2010 <1.0 1.8 <1.0 <1.0 587
4th Qtr 10/15/2010 <1.0 1.4 <1.0 <1.0 522
1stQtr 2/16/2011 <1.0 1.8 <1.0 <1.0 1,100
2nd Qtr 6/14/2011 <1.0 1.1 <1.0 <1.0 1,110
:
:Qtr 8/16/2011 <1.0 1.7 <1.0 <1.0 967
Qtr 11/15/2011 NA #N/A NA NA 608
(1) 12nt2011 <1.0 1.2 <1.0 <1.0 #N/A #N/A
30.5
30.4
30.7
28.3
33.1
30
31
31
31
35
34
35
1~~~1,l2L __ 1~~~~~6~~ :~:6---------:~:6 ----:~:6------:~:6----------------~~~ -----------1;
3rdQtr 8/30/2012 <1.0 <1.0 <1.0 <1.0 489 37 41h Qtr ____ 10/312012 <1.0 ______________ 1 <1.0 ______ <1.0 ___
1
,4
26
05
0
___________
35
~.-8
9 1stQtr(3) 2/11/2013 <1.0 1 <1.0 <1.0 ---
2ndQtr 6/5/2013 <1.0 17.4 <1.0 <1.0 916 23.7
3rd Qtr 8/30/2013 <1.0 21.8 <1.0 <1.0 998 33
4th Qtr 10/29/2013 <1.0 32.5 <1.0 <1.0 1 030 35
1stQtr 1/27/2014 1.18 78.5 <1.0 <1.0 -809 31.6
2nd Qtr 5/19/2014 <1.0 62.7 <1.0 <1.0 1,020 35.0
3rdQtr 8/11/2014 <1.0 76.3 <1.0 <1.0 1,150 31.5
4th Qtr 10/21/2014 <1.0 25.8 <1.0 <1.0 1 050 35.7
1stQtr 3/9/2015 <1.0 49.2 <1.0 <1.0 944 34.6
2ndQtr 6/812015 <1.0 4.28 <1.0 <1.0 1,290 31.8
3rd Qtr 8/31/2015 <1.0 46.9 <1.0. <1.0 788 25.3
4th.Ctr 10/19/2015 <1.0 25.3./_<cc1cc.0,------+<-'-1'-'.0c--_____ l-_____ .,;90;,9;+-------~2"'9.-,j6I
1stQtr 3/9/2016 <1.0 2ia <1.0 <1.0 989 29.1
2nd Qtr 5/23/2016 <1.0 69.6 <1.0 <1.0 771 24.2
3rd Qtr 7/25/2016 <1.0 17.8 <1.0 <1.0 1,180 34.4
4th Qtr 10/12/2016 <1.0 20.8 <1.0 <1.0 1 010 31.9
1stQtr 3/8/2017 <1.0 18.3 <1.0 <1.0 1,090 41.3
2nd Qtr 6/13/2017 <1.0 17.2 <1.0 <1.0 1,080 39.9
3rd Qtr 7/26/2017 <1.0 17.8 <1.0 <1.0 1,230 40.0
4th Qtr 10/11/2017 <1.0 16.0 <1.0 <1.0 895 31.7
OWMRCs~rtsam~e <0.38 36.0 <0.60 1.3 J 1100 32.0
1stQtr 3/16/2018 <1.0 24.9 <1.0 <1.0 1,320 44.9
2nd Qtr 6/14/2018 <1.0 49.2 <1.0 <1.0 792 33.6
3rd Qtr 8122/2018 <1.0 35 <1.0 <1.0 996 33.8
4th Qtr 11/28/2018 <1.0 21 <1.0 <1.0 1,100 38.4
DWMRC solit samole <5.0 60 <5.0 <5.0 1,000 34.0
1stQtr 3/812019 <1.0 28.1 <1.0 <1.0 1,040 39.3
2nd Qtr 6/5/2019 <1.0 28.8 <1.0 <1.0 1,020 33.2
3rd Qtr 9/4/2019 <1.0 31.1 <1.0 <1.0 1,130 36.4
4th Qtr 12/10/2019 <1.0 43.3 <1.0 <1.0 1 090 33.8
1stQtr 2/19/2020 <1.0 61.7 <1.0 <1.0 1,010 37.1
2ndQtr 5/27/2020 <1.0 49.4 <1.0 <1.0 1,060 41.7
3rd Qtr 9/4/2020 <1.0 63.8 <1.0 <1.0 1,100 39.1
4th Qtr 10/28/2020 <1.0 72.6 <1.0 <1.0 1,050 35.9
1stQtr 2/23/2021 <1.0 96.2 3.6 <1.0 1,170 41 .9
2nd Qtr 6/9/2021 <1.0 41.9 <1.0 <1.0 938 48.0
3rdQtr 8/26/2021 <1.0 103 <1.0 <1.0 1,010 26.7
4th Qtr 12/1/2021 <1.0 112 <1.0 <1.0 1140 43.6
1stQtr 3/912022 <1.0 114 <1.0 <1.0 980 36.2
2nd Qtr 6/8/2022 <1.0 124 <1.0 <1.0 944 35.0
3rd Qtr 8/30/2022 <1.0 88.9 <1.0 <1.0 868 32.0
4th Qtr 11/30/2022 <1.0 79.5 <1.0 <1.0 972 27.6
(1) voes were resampled because laboratory missed holding time
(2) As of March 2012 both north and south wild life ponds no longer receiving water.
(3) Chloroform_pum.e'!2well started 1/26/13 _______ _
NA = not analyzed
Shaded indicates concentrations exceeding GWQS
J = Approximated value
TABLE 1 (26 of 33)
Historic Summary Of Monitoring Well Analytical Results Up To The 4th Quarter 2022
Chloroform Contamination lrlvestigation
OUSA White Mesa Mill
i TW4-25 Parameter
(nitrate pumping well started (GWQS) 1/26/13)
Sampling Event Carbon Tetrachloride Chloroform Chloromethane Methylene Chloride Chloride
15 ua/LI 170 ua/LI 130 ua/LI 15 ua/LI No GWQS Ima/LI
2ndQtr 6127/2007 <1 .0 <1.0 <1.0 <1.0 395
3rd Qtr 8/15/2007 <1.0 2.2 <1.0 <1.0 382
4th Qtr 10/10/2007 <1.0 <1.0 <1.0 <1.0 358
1stQtr 3/28/2008 <1.0 <1.0 <1.0 <1.0 374
2nd Qtr 6125/2008 <1.0 <1.0 <1.0 <1.0 344
3rdQtr 9110/2008 <1.0 <1.0 <1.0 <1.0 333
4th Qtr 10/15/2008 NA #NIA NA NA 366
11118/2008 <2.0 <2.0 <2.0 <2.0 #NIA
1stQtr 3/412009 <1.0 <1.0 <1.0 <1.0 3
2nd Qtr 6123/2009 <1.0 <1.0 <1.0 <1.0 328 ............................................ . ........... 3rdQtr 9/1412009 <"f ri <10 <io ...... <"{'()"''"" 328
4thOtr 12/16/2009 <1 .0 <1.0 <1.0 <1.0 371
1stQtr 3/23/2010 <1.0 <1.0 <1.0 <1.0 296
2ndQtr 6/14/2010 <1.0 <1.0 <1 .0 <1.0 306
3rd Qtr 8/10/2010 <1.0 <1.0 <1 .0 <1.0 250
4thOtr 10/15/2010 <1.0 <1.0 <1.0 <1.0 312
1stQtr 2116/2011 <1.0 1.8 <1.0 <1.0 315
2nd Qtr 5125/2011 <1.0 <1.0 <1.0 <1.0 321
3rdQtr 811612011 <1.0 <1.0 <f.0 <1.0 276
4th Qtr 1111512011 <1.0 <1.0 <1.0 <1.0 294
\sf0ti(2i 1116/2012 <1.0 <1.0 <1.0 <1.0 304
2nd Qtr 5/3112012 <1.0 ---------<1.0 ____ <1.0 ______ <1.0 --------287
3rdQtr 9/412012 <1.0 <1.0 <1.0 <1.0 334
4th Qtr 10/312012 <1.0 <1.0 <1.0 <1.0 338
1stQtr(J) 2111/2013 <1.0 --------<1.0 ____ <1.0 ______ <1.0 ---------190
2ndQtr 6/5/2013 <1.0 <1.0 <1.0 <1.0 136
3rd Qtr 9/4/2013 <1.0 <1.0 <1.0 <1.0 119
4thQtr 10/31/2013 <1.0 <1.0 <1.0 <1.0 88.6
1stQtr 1/27/2014 <1.0 <1.0 <1.0 <1.0 85.7
2ndQtr 5/19/2014 <1.0 <1.0 <1.0 <1.0 51.1
3rd Qtr 8111/2014 <1.0 <1.0 <1.0 <1.0 67
4thQtr 10121/2014 <1.0 <1 .0 <1.0 <1.0 58.1
1stQtr 31912015 <1.0 <1.0 <1.0 <1.0 310
2nd Qtr 6/812015 <1.0 <1.0 <1.0 <1.0 58.3
3rdQtr 8131/2015 <1.0 <1.0 <1.0 <1.0 69.2
4th Qtr 10/19/2015 <1.0 <1.0 <1.0 <1.0 93.7
1stQtr 319/2016 <1.0 <1.0 <1.0 <1.0 62.7
2nd Qtr 512312016 <1.0 <1.0 <1.0 <1 .0 75.5
3rdQtr 7125/2016 <1.0 <1.0 <1.0 <1.0 74.1
4th Qtr 10/12/2016 <1.0 <1.0 <1.0 <1 .0 59.8
1stQtr 31812017 <1.0 1.15 <1.0 <1.0 285
2nd Qtr 6/1312017 <1.0 <1.0 <1.0 <1.0 69.8
3rdOtr 7/2612017 <1.0 <1.0 <1.0 <1.0 70.1
4thOtr 10/1112017 <1.0 <1.0 <1.0 <1.0 68.0
1stQtr 3/12/2018 <1.0 1.15 <1.0 <1.0 70.5
2ndQtr 6/14/2018 <1.0 <1.0 <1.0 <1.0 60.3
3rdQtr 8/22/2018 <1.0 <1.0 <1.0 <1.0 69.1
4thQtr 11/28/2018 <1.0 <1.0 <1.0 <1.0 59.7
1stQtr 3/8/2019 <1.0 <.1.0 <1.0 <1.0 65
2ndQtr 6/5/2019 <1.0 <1.0 <1.0 <1.0 59
3rd Otr 9/4/2019 <1.0 <1.0 <1.0 <1.0 58.1
4th Qtr 12110/2019 <1.0 <1.0 <1.0 <1.0 73.1
1stQtr 2/19/2020 <1.0 <1.0 <1.0 <1.0 86.0
2nd Qtr 5127/2020 <1.0 <1.0 <1.0 <1.0 76.8
3rdQtr 914/2020 <1.0 <1.0 <1.0 <1 .0 67.3
4th Qtr 10128/2020 <1.0 <1.0 <1.0 <1.0 61.3
1stQtr 2123/2021 <1.0 <1.0 <1.0 <1.0 100
2nd Qtr 6/912021 <1.0 <1.0 <1.0 <1.0 55.1
3rdOtr 812612021 <1.0 <1.0 1.34 <1.0 69.3
4th Qtr 12/112021 <1 .0 <1.0 <1.0 <1.0 93.7
1stQtr 31912022 <1.0 <1.0 <1.0 <1.0 70.3
2nd Qtr 6/8/2022 <1.0 <1.0 <1.0 <1.0 72.8
3rdQtr 8/30/2022 <1.0 <1.0 <1.0 <1.0 82.5
4thQtr 11/30/2022 <1.0 <1.0 <1.0 <1.0 67.2
(1) voes were resampled because laboratory missed holding time.
(2) As of March 2012 both north and south wild life ponds no longer receiving water.
(3)Chloroform~um,e~wellstarted 1'2.6/13 -------·
NA = not analyzed
Shaded indicates concentrations exceeding GWQS.
Nitrate, Nitrate + Nitrite
110 ma/LI
17.1
29
17
18.7
22.1
18.8
21 .3
#NIA
15.3
15.3
3.3
14.2
14.4
16
14
15
15
16
16
16
16
----------1 6
17
----------J 7 9.04
5.24
5.69
6.1
2.16
1.21
1.6
1.03
14.4
1.14
1.63
1.78
0.837
0.959
1.78
1.24
17.0
0.976
1.23
1.29
2.23
1.14
0.810
0.634
0.639
0.821
0.548
0.841
0.607
0.851
0.994
1.64
3.43
1.57
0.793
0.978
1.8
0.88
1.51
1.47
TABLE 1 (27 of 33)
Historic Summary Of Monitoring Well Analytical Results Up To The 4th Quarter 2022
Chloroform Contamination Investigation
TW4-26
Sampling Event
Parameter
fGWQSl
Carbon Tetrachloride
15 ua/Ll
DUSA White Mesa Mill
Chloroform Chloromethane Methylene Chloride Chloride Nitrate, Nitrate+ Nitrite
170 ua/Ll 130 ua/Ll (5 ug/L) No GWQS (mo/LI 11 0 mn/LI
2nd Qtr 6/14/2010 <1.0 13 <1.0 <1.0 33 7.9
3rdQtr 8/24/2010 <1.0 5.2 <1.0 <1.0 17 9.0
4th Qtr 10/15/2010 <1.0 5.4 <1.0 <1.0 22 9.6
tstQtr 2/16/2011 <1.0 2 <1.0 <1.0 30 10.0
2ndQtr 5/26/2011 <1.0 2.9 <1.0 <1.0 15 10.0
JrdQtr 8/17/2011 <1.0 2.8 <1.0 <1.0 19 11 .0
4th Qtr 11/16/201 t NA #NIA NA NA 26 10.0
lsf(ifrm ::,~:~~:~ :: ~ 51 :: ~ :: ~ #N/A tir#-"Ncc/A_,__ _____ 1_1_.0cl
2ndQtr -6/6/2012 <1.0 ----------4.1 <1.0 ------<1.0 ________ ---------19 12.0
3rd Qtr 9/11/2012 <1.0 4.9 <1.0 <1.0 19 9.0
t,4,.'th,_O=tr"----i,10c;;/','3/2"'0""1"'2+<..,1,.,.o~------+-----;-4·s,91-<:..:1.c;.0;-___ -+<-"t,c.o~ _____ f-______ 1,,9 12.0
1stQtr 2111/2013 <1.0 4.9 <1.0 <1.0 16.6 12.5
2ndQtr 6/13/2013 <1.0 2.12 <1.0 <1.0 14.5 13.6
3rd Qtr 9/5/2013 <1.0 2.81 <1.0 <1.0 17.6 11.7
._i~~h.,_tg=~"----~;,~~17""9~=2~~;~;+:-)"'.~'------_._--~~~J; :;~ ::~ )~~ )!~
2ndQtr 5/21/2014 <1.0 4.23 <1.0 <1.0 15.4 12.5
3rd Qtr 8/11/2014 <1.0 1.3 <1.0 <1.0 15 10.8
4th Qtr 10/28/2014 <1.0 2.45 <1.0 <t.0 14.6 12.3
1stQtr 3/12/2015 <1.0 2.37 <1.0 <t.0 14.4 14.4
2ndQtr 6/10/2015 <1.0 6.12 1.17 <1.0 14.4 11.3
3rd Qtr 9/3/2015 <1.0 4.77 <1.0 <1.0 14 14.2
4th Qtr 10/28/2015 <1.0 3.45 <1.0 <1.0 13.3 13.9
tstQtr 3/16/2016 <1.0 1.8 <1.0 <1.0 13.7 16.9
2ndQtr 5/26/2016 <1.0 8.23 <1.0 <1.0 15.2 13.9
3rd Qtr 8/3/2016 <1.0 4.42 <1.0 <1.0 13.9 17.9
4th Qtr 10/20/2016 <1.0 19.9 <1.0 <t.0 14.2 15.0
1stQtr 3/16/2017 <1.0 46.1 <1.0 <1.0 16.2 15.8
2ndQtr 6/20/2017 <1.0 244 <1.0 <1.0 19 15.2
3rd Qtr 8/3/2017 <1.0 419 <1.0 <1.0 25.8 15.2
4th Qtr 10/11/2017 <1.0 608 <1.0 <1.0 27.3 10.0
1stOtr 3/21/2018 <1.0 1,050 <1.0 <1.0 35.5 12.2
2ndQtr 6/14/2018 <1.0 960 <1.0 <1.0 33.5 13.2
3rd Qtr 9/6/2018 <1.0 916 <1.0 <1.0 38.9 13.5
4th Qtr 12113/2018 <1.0 1 050 <1.0 <1.0 33.4 11.8
1stOtr 3/20/2019 <1.0 963 <1.0 <1.0 32.9 12.2
2nd Qtr 6/5/2019 <1.0 1,070 <1.0 <1.0 35.8 12.6
3rd Qtr 9/12/2019 <1.0 877 <1.0 <1.0 32.0 10.9
4th Qtr 12/18/2019 <1.0 1 070 <1.0 <1.0 38.3 10.3
1stQtr 3/18/2020 <1.0 1,090 <1.0 <1.0 36.3 11.9
2ndQtr 6/12/2020 <1.0 1,140 <1.0 <1.0 35.1 11.1
3rd Qtr 9/19/2020 <1.0 1120 <1.0 <1.0 34.8 10.5
._4~th.,_Q=tr __ ~1~1/~1~1/=2~02~0+<_1~.0'-_____ _,_ __ ~1160 <1.0 <1.0 36.3 11.9
1stQtr 3/24/2021 <1.0 1,030 <1.0 <1.0 38.9 11.3
2nd Qtr 6/17/2021 <1.0 1,020 <1.0 <1.0 34 14.2
3rd Qtr 9/23/2021 <1.0 927 <1.0 <1.0 36.5 12.1
4th Qtr 12/9/2021 <1.0 993 <1.0 <1.0 34.9 8.15
1stQtr 3/24/2022 <1.0 952 2.4 <1.0 33.0 10.9
2ndQtr 6/22/2022 <1.0 790 <1.0 <1.0 34 9.9
3rd Qtr 9/15/2022 <1.0 930 <1.0 <1.0 36.7 10.3
4th Qtr 12/9/2022 <1.0 890 <1.0 <1.0 32.7 10.4
TW4-27
lstOtr(2) 1/18/2012 <1.0 9 <1.0 <1.0 11 24.0
2nd Qtr ---6/13/2012 <1.0 -------<1.0 <1.0 ------<1.0 -----------------17 41.0
3rd Qtr 9/4/2012 <1.0 <1.0 <1.0 <1.0 21 37.0
1'4,.,,th.,_Q=-tr,,__ __ ~10;,i;:3/~20;.1"S2+<-"1"".0;--~----+:<-'-1."'0---1-<'-'1.c,.0'-----+<-"1"'.0'------,f-------1"S81---------'3"'6"".0'I 1stOtr 217/2013 <1.0 <1.0 <1.0 <1.0 18.8 31.2
2ndQtr 6/13/2013 <1.0 <1.0 <1.0 <1.0 20.3 29.4
3rd Qtr 8/30/2013 <1.0 <1.0 <1.0 <1.0 19 27.2
4thQtr 11/6/2013 <1.0 <1.0 <1.0 <1.0 21.8 29.8
1stQtr 1/23/2014 <1.0 <1.0 <1.0 <1.0 31.8 31.3
2nd Qtr 5/21/2014 <1.0 <1.0 <1.0 <1.0 20.6 31.1
JrdQtr 8/13/2014 <1.0 <1.0 <1.0 <1.0 23 27.0
4thQtr 10/28/2014 <1.0 <1.0 <1.0 <1.0 24.4 28.2
1stQtr 3/11/2015 <1.0 <1.0 <1.0 <1.0 26.2 26.5
2nd Qtr 6/10/2015 <1.0 <1.0 <1.0 <1.0 26.8 24.0
JrdQtr 9/2/2015 <1.0 t.3 <1.0 • <1.0 26.8 20.9
4thQtr 10/28/2015 <1.0 1.6 <1.0 <1.0 26.2 23.5
1stQtr 3/16i2016 <1.0 2.11 <1.0 <1.0 28 25.0
2nd Qtr 5/26/2016 <1.0 3.16 <1.0 <1.0 21.2 28.7
JrdQtr 8/3/2016 <1.0 2.78 <1.0 <1.0 27.1 21 .8
4thQtr 10/20/2016 <1.0 3.8 <1.0 <1.0 29.4 19.3
1stQtr 3/15/2017 <1.0 4.33 <1.0 <1.0 28.3 22.2
2nd Qtr 6/15/2017 <1.0 5.65 <1.0 <1.0 27.9 23.8
JrdQtr 812/2017 <1.0 6.05 <1.0 <1.0 29.5 20.0
4thQtr 10/10/2017 <1.0 5.91 <1.0 <1.0 26.3 21 .5
1stQtr 3/14/2018 <1.0 6.95 <1.0 <1.0 30.3 19.5
2ndQtr 6/13/2018 <1.0 5.95 <1.0 <1.0 28.3 22.0
JrdQtr 8/30/2018 <1.0 7.35 <1.0 <1.0 31.4 18.1
4th Qtr 12/12/2018 <1.0 7.7 <1.0 <1.0 28.2 20.8
1stQtr 3/16/2019 <1.0 6.54 <1.0 <1.0 26.2 21 .5
2ndQtr 6/13/2019 <1.0 8.24 <1.0 <1.0 28.6 22.3
JrdQtr 9/11/2019 <1.0 7.58 <1.0 <1.0 25.3 21 .2
4thQtr 12/14/2019 <1.0 7.97 <1.0 <1.0 27.4 22.0
1stQtr 3/18/2020 <1.0 8.04 <1.0 <1.0 27.6 23.6
2nd Qtr 6/11/2020 <1.0 7.92 <1.0 <1.0 28.0 21 .5
JrdQtr 9/18/2020 <1.0 5.62 <1.0 <1.0 26.2 25.2
4thQtr 11/4/2020 <1.0 7.8 <1.0 <1.0 26.8 16.7
1st Qtr 3/18/2021 <1.0 4.66 <1.0 <1.0 27.5 23.0
2nd Qtr 6/17/2021 <1.0 4.26 <1.0 <1.0 25.8 23.8
JrdQtr 9/15/2021 <1.0 3.81 <1.0 <1.0 21.7 21 .1
4th Qtr 12/8/2021 <1.0 4.08 <1.0 <1.0 26.4 24.9
tstQtr 3/23/2022 <1.0 3.3 <1.0 <1.0 22.7 21 .3
2nd Qtr 6/16/2022 <1.0 3.1 <1.0 <1.0 22.3 20.0
3rd Qtr 9/14/2022 <1.0 4.3 <1.0 <1.0 23.2 16.9
4thQtr 1218/2022 <1.0 2.3 <1.0 <1.0 16.2 18.t
(1) voes were resampled because laboratory m1SSed holding time.
(2) As of March 2012 both north and south wild life ponds no longer receiving water.
NA = not analyzed
Shaded indicates concentrauons exceeQmg GWQS
TW4-28
Sampling Event
TABLE 1 (28 of 33)
Historic Summary Of Monitoring Well Analytical Results Up To The 4th Quarter 2022
Chloroform Contamination Investigation
DUSA White Mesa Mill
Parameter
IGWQS)
Carbon Tetrachloride Chloroform Chloromethane Methylene Chloride Chloride
15 ua/L\ 170 ua/L\ 130 un/L\ 15 ua/Ll No GWQS lma/Ll
2ndQtr 6/19/2013 <1.0 <1.0 <1.0 <1.0 44.6
3rdQtr 8/29/2013 <1.0 <1.0 <1.0 <1.0 45.3
4thQtr 11/6/2013 <1.0 <1.0 <1 .0 <1.0 45.3
1stQtr 1/22/2014 <1.0 <1.0 <1.0 <1.0 47.8
2nd Qtr 5/21/2014 <1.0 <1.0 <1.0 <1.0 45.7
3rdQtr 8/13/2014 <1.0 <1.0 <1.0 <1.0 50
4th Qtr 10/23/2014 <1.0 <1.0 <1.0 <1.0 52.1
1stQtr 3/11/2015 <1.0 <1.0 <1.0 <1.0 52.2
2nd Qtr 6/10/2015 <1.0 <1.0 <1.0 <1.0 56.4
3rdQtr 9/2/2015 <1.0 <1.0 <1.0 <1.0 61.4
4th Qtr 10/21/2015 <1.0 <1.0 <1.0 <1.0 52.7
1stQtr 3/15/2016 <1.0 <1.0 <1.0 <1.0 61.6
Duplicate TW4-65 <1.0 <1.0 <1.0 <1.0 61.4
12nd Qtr 5/25/2016 <1.0 <1.0 <1.0 <1.0 67.1
3rdQtr 7/27/2016 <1.0 <1.0 <1.0 <1.0 70.1
Ouphcate TW4-65 <1.0 <1.0 <1.0 <1.0 70.9
14th Qtr 10/19/2016 <1.0 <1.0 <1.0 <1.0 70.9 ,-~ird;:e TW4-65 <1.0 <1.0 <1.0 <1.0 73.7
3/14/2017 <1.0 <1.0 <1.0 <1.0 64.2
Ouphcate TW4-65 <1.0 <1.0 <1.0 <1.0 66.4
2ndQtr 6/14/2017 <1.0 <1.0 <1.0 <1.0 68.6
3rdQtr 7/27/2017 <1.0 <1.0 <1.0 <1.0 67.1
4thQtr 10/10/2017 <1.0 <1.0 <1.0 <1.0 57.4
1stQtr 3/14/2018 <1.0 <1.0 <1.0 <1.0 65.0
2nd Qtr 6/12/2018 <1.0 <1.0 <1.0 <1.0 55.7
Duplicate TW4-65 <1.0 <1.0 <1.0 <1.0 56.7
3rd Qtr 8/29/2018 <1.0 <1.0 <1.0 <1.0 63.8
4thQtr 11/30/2018 <1.0 <1.0 <1.0 <1.0 52.4
1stQtr 3/16/2019 <1.0 <1.0 <1.0 <1.0 51.7
2ndQtr 6/13/2019 <1.0 <1.0 <1.0 <1.0 51.8
3rdQtr 9/11/2019 <1.0 <1.0 <1.0 <1.0 49.0
4thQtr 12/12/2019 <1.0 <1.0 <1.0 <1.0 50.0
1stQtr 3/17/2020 <1.0 <1.0 <1.0 <1.0 52.1
2ndQtr 6/10/2020 <1.0 <1.0 <1.0 <1.0 49.8
3rd Qtr 9/17/2020 <1.0 <1.0 <1.0 <1.0 47.4
4thQtr 11/4/2020 <1.0 <1.0 <1.0 <1.0 49.0
1stQtr 3/17/2021 <1.0 <1.0 <1.0 <1.0 51.8
2ndQtr 6/15/2021 <1.0 <1.0 <1.0 <1.0 48.5
3rd Qtr 9/15/2021 <1.0 <1.0 <1.0 <1.0 40.7
4thQtr 12n12021 <1.0 <1.0 <1.0 <1.0 47.8
1stQtr 3/15/2022 <1.0 <1.0 <1.0 <1.0 38.8
2ndQtr 6/15/2022 <1.0 <1.0 <1.0 <1.0 52.3
3rdQtr 9/13/2022 <1.0 <1.0 <1.0 <1.0 58.5
4thQtr 12n12022 <1.0 <1.0 <1.0 <1.0 52.0
TW4-29
2ndQtr 6/19/2013 <1.0 242 <1.0 <1.0 44.8
2ndQtr 7/11/2013 <1.0 262 <1.0 <1.0 37.7
3rdQtr 9/26/2013 <1.0 246 <1.0 <1.0 41.4
4thQtr 11/13/2013 <1.0 260 <1.0 <1.0 42.5
1stQtr 2/5/2014 <1.0 258 <1.0 <1.0 14.9
2nd Qtr 5/22/2014 <1.0 262 <1.0 <1.0 38.2
3rdQtr 8/27/2014 <1.0 242 <1.0 <1.0 41
4thQtr 10/29/2014 <1.0 290 <1.0 <1.0 41
1stQtr 3/12/2015 <°f.O 299 <1.0 <1.0 40.5
2nd Qtr 6/11/2015 <1.0 329 <1.0 <1.0 42.5
3rdQtr 9/3/2015 <1.0 276 <1.0 <1.0 47.3
4th Qtr 10/29/2015 <1.0 631 <1.0 <1.0 39.8
1stQtr 3/17/2016 <TO 335 <1.0 <1.0 40.5
2ndQtr 6/8/2016 <1.0 366 <1.0 <1.0 42.9
3rdQtr 8/3/2016 <1.0 401 <1.0 <1.0 40.6
4thQtr 10/26/2016 <1.0 392 <1.0 <1.0 44.2
1stQtr 3/16/2017 ·<fa 446 <1.0 <1.0 41.5
2nd Qtr 6/4/2017 <1.0 420 <1.0 <1.0 42
3rdQtr 8/4/2017 <1.0 466 <1.0 <1.0 42.9
4thQtr 10/11/2017 <1.0 431 <1.0 <1.0 37.7
1stQtr 3/14/2018 <1.0 533 <1.0 <1.0 43.1
2nd Qtr 6/14/2018 <1.0 474 <1.0 <1.0 40.1
3rdQtr 8/29/2018 <1.0 454 <1.0 <1.0 45.9
4thQtr 12/13/2018 <1.0 521 <1.0 <1.0 40.9
1stQtr 3/20/2019 <1.0 507 <1.0 <1.0 39.9
2ndQtr 6/13/2019 <1.0 537 <1.0 <1.0 39.4
3rdQtr 9/12/2019 <1.0 549 <1.0 <1.0 38
4th Qtr 12/18/2019 <1.0 630 <1.0 <1.0 44.8
1stQtr 3/18/2020 <1.0 652 <1.0 <1.0 41
2nd Qtr 6/12/2020 <1.0 686 <1.0 <1.0 42.2
3rdQtr 9/19/2020 <1.0 621 <1.0 <1.0 39.9
4thQtr 11/11/2020 <1.0 671 <1.0 <1.0 40.8
DWMRC_solit samole <10 670 <20 <20 42
1st0tr 3/24/2021 <1.0 577 <1.0 <1.0 44.:i
2ndQtr 6/17/2021 <1.0 543 <1.0 <1.0 40
3rdQtr 9/23/2021 <1.0 602 <1.0 <1.0 40.1
4thQtr 12/9/2021 <1.0 625 <1.0 <1.0 38.7
Dunlicate TW4-75 <1.0 636 <1.0 <1.0 40
·1stQtr 3/23/2022 <1.0 624 <1.0 <1.0 39.1
2nd Qtr 6/22/2022 <1.0 398 <1.0 <1.0 41.5
3rdQtr 9/23/2021 <1.0 591 <1.0 <1.0 41.8
Duplicate TW4-75 <1.0 591 <1.0 <1.0 42.0
4th Qtr 12/9/2022 <1.0 588 <1.0 <1.0 41.3
H ~as analyzed beyond holding times and may not be accureate concentration.
Shaded 1nd1cates concentrabons exceeding GWQS
Nitrate, Nitrate + Nitrite
110 ma/Ll
14.9
17.3
16.2
16.9
16.5
14.2
16.5
19.0
19.0
17.8
18.7
34.0
32.6
29.0
31 .3
35.6
25.5
25.4
24.4
27.9
26.0
24.8
24.8
17.2
19.0
18.7
16.0
17.7
17.2
15.0
10.2
9.48
9.87
9.55
8.36
7.76
8.68
9.09
8.08
7.60
7.80
15.0
16.2
16.6
4.60
3.52
4.18
4.11
4.63
3.52
3.40
3.64
4.14
2.95
2.19
2.74
2.92
2.51
2.44
2.40
2.24
2.26
2.35
2.45
2.44
2.67
2.52
2.50
2.67
2.56
2.55
2.58
3.10
3.18
2.90
3.27
0.75 H
3 09
3.59
3.29
2.39
1.91
3.10
2.9
2.80
2.76
2.69
TW4-30
Sampling Event
TABLE 1 (29 of 33)
Historic Summary Of Monitoring Well Analytical Results Up To The 4th Quarter 2022
Chloroform Contamination Investigation
DUSA White Mesa Mill
Parameter
IGWQSl
Carbon Tetrachloride Chloroform Chloromethane Methylene Chloride Chloride
15 uo/Ll 170 uo/Ll 130 uo/Ll (5 UQIL) No GWQS (mo/Ll
2ndQtr 6119/2013 <1.0 <1.0 <1.0 <1.0 36
3rdQtr 9/26/2013 <1.0 <1.0 <1.0 <1.0 36.3
4thQtr 11/13/2013 <1.0 <1.0 <1 .0 <1.0 35.9
1stQtr 1123/2014 <1.0 <1.0 <1.0 <1.0 36.9
2ndQtr 5122/2014 <1.0 <1.0 <1.0 <1.0 31 .9
3rd Qtr 8/23/2014 <1.0 <1.0 <1 .0 <1.0 38
4th Qtr 10123/2014 <1.0 <1.0 <1 .0 <1.0 37.1
1stQtr 3111/2015 <1.0 1.65 <1.0 <1.0 38.3
2ndQtr 6/11/2015 <1.0 2.25 <1.0 <1.0 40.3
3rd Qtr 9/3/2015 <1.0 3.27 <1.0 <1.0 44.2
4thQtr 10128/2015 <1.0 3.48 <1 .0 <1.0 37.8
1stQtr 3117/2016 <1.0 5.16 <1 .0 <1.0 39.6
2ndQtr 5126/2016 <1.0 7.38 <1.0 <1.0 40.2
3rdQtr 8/3/2016 <1.0 6.79 <1 .0 <1.0 38.6
4thQtr 10/20/2016 <1.0 8.69 <1.0 <1.0 41 .3
1stQtr 3115/2017 <1.0 13.6 <1 .0 <1.0 37.7
2ndQtr 6/15/2017 <1.0 15.2 <1.0 <1.0 37.8
3rdQtr 8/3/2017 <1.0 15.7 <1 .0 <1.0 -39.8
4thQtr 10/10/2017 <1.0 13.4 <1 .0 <1.0 34.9
1stQtr 3/15/2018 <1.0 16.4 <1.0 <1.0 41
2ndQtr 6/13/2018 <1.0 16.9 <1.0 <1.0 37.4
3rdQtr 8/30/2018 <1.0 19.8 <1.0 <1.0 44.1
4thQtr 12/12/2018 <1.0 23.9 <1.0 <1.0 35.5
1stOtr 3/15/2019 <1.0 25.3 <1.0 <1.0 35.9
2ndOtr 6113/2019 <1.0 31 .5 <1.0 <1.0 27.2
3rdQtr 9/11/2019 <1.0 34.8 <1.0 <1.0 34.5
4thQtr 12/18/2019 <1.0 44.9 <1 .0 <1.0 39.1
1stQtr 3/17/2020 <1.0 53.1 <1.0 <1.0 37.5
2ndQtr 6/12/2020 <1.0 65.4 <1.0 <1.0 38.6
3rdQtr 9/18/2020 <1.0 67.7 <1.0 <1.0 35
4thQtr 11/11/2020 <1.0 82.8 <1.0 <1.0 37.1
DWMRC snlit samnle <10 66 <20 <20 39
1stOtr 3117/2021 <1.0 74.8 <1 .0 <1.0 37.6
2ndQtr 6/17/2021 <1.0 78.7 <1.0 <1.0 38.3
3rdQtr 9/22/2021 <1.0 78.2 <1.0 <1.0 23.5
4thQtr 12/8/2021 <1.0 81 .2 <1 .0 <1.0 37.9
1stQtr 3123/2022 <1.0 73.6 <1.0 <1.0 35.1
2ndQtr 6122/2022 <1.0 70.8 <1.0 <1.0 41 .3
3rdQtr 9/14/2022 <1.0 68.8 <1.0 <1.0 30.5
4th Ctr 12/9/2022 <1.0 60.5 <1.0 <1.0 36.5
TW4-31
2ndQtr 6/19/2013 <1.0 <1.0 <1 .0 <1.0 28.4
3rdQtr 9/5/2013 <1.0 <1.0 <1.0 <1.0 29.4
4thQtr 111712013 <1.0 <1.0 <1.0 <1.0 28
1stQtr 1/23/2014 <1.0 <1.0 <1.0 <1.0 28.5
2ndQtr 5/21/2014 <1.0 <1.0 <1 .0 <1.0 26.3
3rdQtr 8/13/2014 <1.0 <1.0 <1 .0 <1.0 30
4thQtr 10/28/2014 <1 .0 <1.0 <1.0 <1.0 37.1
1stOtr 3/11/2015 <1 .0 <1.0 <1 .0 <1.0 30.6
2ndQtr 6/10/2015 <1 .0 <1.0 <1.0 <1.0 31 .1
3rdOtr 9/2/2015 <1.0 <1.0 <1.0 <1.0 30.4
4thQtr 10/21/2015 <1 .0 <1.0 <1.0 <1.0 29.1
1stQtr 3/1112016 <1 .0 <1.0 <1.0 <1.0 31 .5
2ndQtr 5/2512016 <1.0 <1.0 <1.0 <1.0 32.5
3rdQtr 7/28/2016 <1.0 <1.0 <1.0 <1.0 30.6
4thQtr 10/2012016 <1 .0 <1.0 <1.0 <1.0 34
1stQtr 3/1512017 <1 .0 <1.0 <1.0 <1.0 31 .3
2nd Qtr 6/1512017 <1.0 <1.0 <1.0 <1.0 33.4
3rdQtr 812/2017 <1.0 <1.0 <1.0 <1.0 33
4th Qtr 10/1012017 <1 .0 <1.0 <1.0 <1.0 30.9
1stOtr 3/1412018 <1.0 <1.0 <1.0 <1.0 38.8
2nd Qtr 6/12/2018 <1 .0 <1.0 <1.0 <1.0 34.4
3rdQtr 8129/2018 <1.0 <1.0 <1.0 <1.0 40.3
4th Qtr 12/12/2018 <1 .0 <1.0 <1.0 <1.0 35.2
1stQtr 3/1612019 <1.0 <1.0 <1.0 <1.0 35
2nd Qtr 6/1312019 <1 .0 <1.0 <1.0 <1.0 36.9
3rdQtr 9111/2019 <1.0 <1.0 <1.0 <1.0 35.8
4th Qtr 12/1412019 <1.0 <1.0 <1.0 <1.0 40.6
1stQtr 3/17/2020 <1.0 <1.0 <1.0 <1.0 38.2
2nd Qtr 6/1212020 <1.0 <1.0 <1.0 <1.0 36.7
3rdQtr 9/17/2020 <1 .0 <1.0 <1.0 <1.0 36.5
4thQtr 11/412020 <1 .0 <1.0 <1.0 <1.0 36.4
1stQtr 3117/2021 <1.0 <1.0 <1.0 <1.0 40.3
2nd Qtr 6/1612021 <1.0 <1.0 <1.0 <1.0 37.9
3rdQtr 9/1512021 <1.0 <1.0 <1.0 <1.0 31 .2
4th Qtr 12/812021 <1.0 <1.0 <1.0 <1.0 40.3
1stQtr 3/1612022 <1.0 <1.0 <1.0 <1.0 34.3
2nd Qtr 6/1612022 <1 .0 <1.0 <1.0 <1.0 35.5
3rdQtr 9113/2022 <1.0 <1.0 <1.0 <1.0 40
4th Qtr 121712022 <1.0 <1.0 <1.0 <1.0 31 .8
Shaded indicates concentrations exceeding GWQS
H = Sample was analyzed beyond holding times and may not be accureate concentration
Nitrate, Nitrate + Nitrite
110 mn/Ll
0.95
0.952
1.24
1.36
1.44
1.5
1.84
2.15
1.75
1.75
1.86
2.74
2.04
2.32
2.51
2.70
2.95
3.11
2.58
3.63
3.93
3.79
3.70
4.08
4.13
3.79
3.62
3.85
3.69
3.49
3.64
<0.5 H
3.54
4.19
2.60
3.14
3.0
2.8
2.61
2.67
1.3
1.1
1.33
1.32
1.22
1.1
1.84
1.33
1.19
0.916
0.953
1.84
1.36
1.41
1.14
1.19
1.21
1.11
1.04
0.916
0.948
0.710
0.766
0.754
0.713
0.61
0.58
0.572
0.569
0.51
0.501
0.501
0.451
0.46
0.339
0.4
0.41
0.396
0.41
TW4-32
Sampling Event
TABLE 1 (30 of 33)
Historic Summary Of Monitoring Well Analytical Results Up To The 4th Quarter 2022
Chloroform Contamination Investigation
DUSA White Mesa Mill
Parameter
IGWQSI
Carbon Tetrachloride Chloroform Chloromethane Methylene Chloride Chloride
15 uo/LI 170 ua/L\ 130 ua/L\ 15 ua/LI No GWQS fma/LI
4th Ctr 11/14/2013 <1.0 <1.0 <1.0 <1.0 52.1
1st Ctr 1/22/2014 .<fo <1 .0 <1.0 <1.0 54.5
2nd Ctr 5/21/2014 <1.0 <1.0 <1.0 <1.0 54.9
3rd Q1r 8/13/2014 <1.0 <1.0 <1.0 <1.0 64
4th Ctr 10/23/2014 <1.0 <1.0 <1.0 <1.0 62.6
1st Ctr 3/11/2015 <1.0 <1.0 <1.0 <1.0 64.2
Duplicate TW4.S5 <1.0 <1.0 <1.0 <1.0 65.9
2nd Qtr 6/10/2015 <1.0 <1 .0 <1.0 <1.0 62.7
3rd Q1r 9/2/2015 <1.0 <1.0 <1.0 <1.0 59.6
4th Qtr 10/21/2015 <1.0 <1.0 <1.0 <1.0 55.1
1stQtr 3/15/2016 <1.0 <1.0 <1.0 <1.0 64.2
2ndQtr 5/25/2016 <1.0 <1.0 <1.0 <1.0 71.8
3rd Qtr 7/28/2016 <1.0 <1.0 <1.0 <1.0 64.4
4th Qtr 10/19/2016 <1.0 <1.0 <1.0 <1.0 66
1stQtr 3/17/2017 <1.0 <1.0 <1.0 <1.0 62.8
2nd Qtr 6/15/2017 <1.0 <1.0 <1.0 <1.0 53.5
3rdQtr 8/2/2017 <1.0 <1.0 <1.0 <1.0 65.8
4th Qtr 10/10/2017 <1.0 <1.0 <1.0 <1.0 65.8
1stQtr 3/14/2018 <1.0 <1.0 <1.0 <1.0 65.4
2nd Qtr 6/12/2018 <1.0 <1.0 <1.0 <1.0 59.2
3rd Qtr 8/29/2018 <1.0 <1.0 <1.0 <1.0 68.1
4thOtr 11/30/2018 <1.0 <1.0 <1.0 <1.0 57.5
1statr 3/16/2019 <1.0 <1.0 <1.0 <1.0 57.5
2nd Qtr 9/11/2019 <1.0 <1.0 <1.0 <1.0 60.1
3rdOtr 9/11/2019 <1.0 <1.0 <1.0 <1.0 55.0
12/14/2019 <1.0 <1.0 <1.0 <1.0 64.7
r 3/17/2020 <1.0 <1.0 <1.0 <1.0 59.7
6/10/2020 <1.0 <1.0 <1.0 <1.0 57.0
3rdOtr 9/17/2020 <1.0 <1.0 <1.0 <1.0 50.8
4thQtr 11/4/2020 <1.0 <1.0 <1.0 <1.0 53.7
1stOtr 3/17/2021 <1.0 <1.0 <1.0 <1.0 60.5
2nd Qtr 6/15/2021 <1.0 <1.0 <1.0 <1.0 40.4
3rdQtr 9/15/2021 <1.0 <1.0 <1.0 <1.0 46.1
4th Qtr 12m 2021 <1.0 <1.0 <1.0 <1.0 55.0
1stQtr 3/16/2022 <1.0 <1.0 <1.0 <1.0 48.0
2nd Qtr 6/15/2022 <1.0 <1.0 <1.0 <1.0 49.4
3rdQtr 9/13/2022 <1.0 <1.0 <1.0 <1.0 51.8
Duplicate TW4-65 <1.0 <1.0 <1.0 <1.0 53.6
4th Qtr 12n12021 <1.0 <1.0 <1.0 <1.0 48.4
TW4-33
4th Qtr 11/14/2013 <1.0 126 <1.0 <1.0 47.2
1stQtr 1/30/2014 <1.0 124 <1.0 <1.0 43.5
2nd Qtr 5/22/2014 <1.0 121 <1.0 <1.0 46.8
3rdQtr 8/27/2014 <1.0 104 <1.0 <1.0 43
4th Qtr 10/29/2014 <1.0 124 <1.0 <1.0 44.2
1stOtr 3/12/2015 <1.0 134 <1.0 <1.0 44.2
2nd Qtr 6/11/2015 <1.0 127 <1.0 <1.0 46.6
3rdQtr 9/3/2015 <1.0 123 <1.0 <1.0 53.3
4th Qtr 10/29/2015 <1.0 129 <1.0 <1.0 44.5
1stQtr 3/17/2016 <1.0 122 <1.0 <1.0 46.2
2nd Qtr 6/8/2016 <1.0 96.1 <1.0 <1.0 49.7
3rdQtr 8/4/2016 <1.0 121 <1.0 <1.0 48.5
4thQtr 10/26/2016 <1.0 109 <1.0 <1.0 52.4
1stQtr 3/17/2017 <1.0 90.7 <1.0 <1.0 49.0
2nd Qtr 6/20/2017 <1.0 103 <1.0 <1.0 49.2
3rdQtr 8/3/2017 <1.0 127 <1.0 <1.0 46.9
4th Qtr 10/11/2017 <1.0 97.1 <1.0 <1.0 42.5
1stQtr 3/15/2018 <1.0 128 <1.0 <1.0 49°:2
2nd Qtr 6/13/2018 <1.0 87.8 <1.0 <1.0 44.0
3rdQtr 9/5/2018 <1.0 113 <1.0 <1.0 50.0
4th Qtr 12/13/2018 <1.0 141 <1.0 <1.0 43.2
1stQtr 3/20/2019 <1.0 86.2 <1.0 <1.0 47.2
2nd Qtr 6/19/2019 <1.0 121 <1.0 <1.0 43.4
3rdOtr 9/12/2019 <1.0 101 <1.0 <1.0 41.1
4th Qtr 12/18/2019 <1.0 117 <1.0 <1.0 48.8
1stOtr 3/18/2020 <1.0 93.7 <1.0 <1.0 45.3
2nd Qtr 6/10/2020 <1.0 90.1 <1.0 <1.0 48.9
3rdQtr 9/18/2020 <1.0 84.9 <1.0 <1.0 51.0
4th Qtr 11/11/2020 <1.0 80.6 <1.0 <1.0 51.5
DWMRC split sample <10 68 <20 <20 54
1stQtr 3/18/2021 <1.0 64.9 <1.0 <1.0 55.6
2ndOtr 6/17/2021 <1.0 63.9 <1.0 <1.0 54.7
3rdQtr 9/22/2021 <1.0 60.2 <1.0 <1.0 42.5
4th Qtr 12/8/2021 <1.0 68.9 <1.0 <1.0 53.8
1stOtr 3/23/2022 <1.0 53.1 <1.0 <1.0 51.4
2nd Qtr 6/22/2022 <1.0 58.7 <1.0 <1.0 56.7
3rdQtr 9/14/2022 <1.0 53.9 <1.0 <1.0 42.2
4th Qtr 12/9/2022 <1.0 50.5 <1.0 <1.0 45.1
Shaded indicates concentrabons exceeding GWQS
H :a: Sample was analyzed beyond holding times and may not be accureate concentration.
Nitrate, Nitrate + Nitrite
!10 ma/LI
4.26
5.fr
5.63
4.2
2.14
2.46
2.25
1.21
5.09
1.19
4.48
3.16
3.44
2.87
2.82
2.37
2.47
2.47
2.94
2.51
2.56
2.50
2.15
2.18
1.84
1.89
1.97
2.19
1.58
1.74
1.80
2.31
1.57
1.34
1.80
1.20
1.59
1.81
1.68
1.82
2.56
1.63
1.50
2.22
1.91
1.62
1.64
1.92
2.13
2.06
2.32
2.36
2.11
2.34
2.04
2.09
1·_94
2.13
1.82
2.01 200
2.16
1.61
1.86
2.44
3.26
3.58
3.71
0.12 H
4.62
6.25
4.33
4.65
3.80
3.70
3.90
3.52
TW4-34
Sampling Event
TABLE 1 (31 of 33)
Historic Summary Of Monitoring Well Analytical Results Up To The 4th Quarter 2022
Chloroform Contamination Investigation
DUSA White Mesa Mill
i~~~: 1)~:~gi!·1,·1:'-'',-g------!--"-",------l i::
2nd 01r · · · · ·· ·· si22i201-i .:1.0 · · f.s0
3rdQtr · · ~@i9!F(q 1io
4iiii:i1r··· 10/29/2014 <1.0'-------1="-----1 i:1ti 1st Qtr :3111/291~ ~t.0..... l.21 2nd01r· · 6111,2015 <1.0 o:86a
Jidc:\tr ii/:ii201s c1:o o.458 .iiiii"oii 1012--;1~,2;;0"'15;i...:•.c1."'o ______ +'-'"',-----+ o.36s 1stQtr 3116/2016 <1.0 0.925 2nc101r · si2s1201a -:1.0 o.sos :iri:lotr ........ !ii3/2016 <1.0 .. 0.726
:.iiiioti' · ·1012012;:o;..:·1=s1-•'-'1"':o'-·-------+="----1 ·o:e12 1stQtr 3/15/2017 <1.0 <1. 0.674 2nd 01r 6/1s,2011 .,:o <1. ofj.i Jidc:\tr iii2i2i>W <1.o . <1. D:ia:i
<iiiiaii iohiii2iiii <1.i> <1: 0.114
OuplicateTW4-65 <1.0~------1·<1. '-----1.:.2""------I• 0.784 1stQtr 3/14/2018 <1.0 <1. 0.737 2nilo1r sh:ii201s .:1.0 <i: o.a11 Jrdoir a,2s1201s •ff ······· ··· ··· <1.0 <1.0 · · o:t:iti
-iiiiaii iv <f.ii · .:1.of-----+=-!"~-----1------~• ,._ ______ ·_···""o . .,,s8,,,0,, 1stQtr 31 <1.0 <1.0 <fa 0.859 2nda1r si •1:0 :.1:0 •ni o.ilii4 :ird·ai, Iii .:1.0 <f.o .:1.0 o.e:i4
:.iiiii:iti' 1 •ff <1.0 c1:o~··----+:,~-----+------4!!41-------·~;oi 1stQtr <1.0 <1.0 <1.0 1.090 ?11~ i;i)i: . .. . .. ii11 iii2020 <1.ii To . < 1.0 . 1.2-ili siii12020 •i:o 1.0 · · ·· ·· .1:0 o:iiis
i1i4i2626 <1.0 {ii <1.0 1.04 1st 3/17/2021 <1.0 1.0 <1 1.09 2nd air sii612oh <i:o 1 o <1 i:iiii 3rd ai, ·· ·· · · ii11si202i .:1.0 10 · · ·· ·· · ·· •1 · · · 1. 1
4iiii:iti' · 1:ua,2021 •ff 1.0 c1 1:02 1s!Qtr 3/16/2022 <1.0 1.0 <1 1.0 :infotr s11si2022.:1:o •fo <1 11i 3rd air ·· ·· · sii412022 •ff i? •1 o iss .iiiii"aii · ·1vai2022 <1.0 <f.o < 1:,e
TW4-35 3idoir · · ····· mii2oi:.i •1:0 4th i:itr . . . ioi2812014 <1 :o 1s!Qtr 3111/2015 <1.0~------1
2nc1aii · siioi201s .,:o
Jidai, iii:11201s <1.0
.iitiiair 1012,,,81"20"'1"'5i-:<cc1,,..o'------1="----1 1s!Qtr 3/16/2016 <1.0 2nd ati · ·· ·· si2s1201s .: io
3rd air · ·· ·· :· s/i,29;$ .•rn ::·:· ·
4itidtr 101201201611-<'-'1"'.o'-------1-="-"'-----1 1st.Qtr.. 3/15/2017 <1.0 2;,c1·01r sHs,2011 .,:o 3rd 01, · a12i201 t .: 1.0
-iiiioir · 101101201i<1":o,,_··· ______ j...:.!"'------+='------+ 1stQtr 3/14/2018 <1.0 2nd i:iir · ·· ·· eifai201 a .: 1.0 3rd 01r ···· ·· · si30,201a .,:o
4itii:itr 12i12i201,,iii.;<cci,,,:o'-·· _____ -4=e....---1-==-----I• 1s1·01r· 3/16/2019 <1.0 2nc10ii s/1312oiil •ff 3rd a1, !iirn2oiii .:1.0 -itiiair·· ·1vi4i2ii1!i!-<:..!·1·,,,:o'-·-------+="----i-="-"'-----I· 1s1·01r·· · 3/17/2020 <1.0 iiiiii;itr · · siiii2020 .:1.0 ····· ·· ····· ·· ·· siii,2020 ., :o
i1i41io21i <to;.··_··------+ ---~31~17/2021 <1.0 nd ..... 6/16120:!1 <1:0 ..
3rd aii ·· · siis12021 ;,1.0 <iii, air · · · · · · 12iii12021 :.1.0,._ _____ -1 1st·Qtr 3/22/2022 .,·:o
2nd i:iir · aiiiii2022 .:1.0 3rdQtr .............. 9/i,i/2022 <1:0 .. .
4itii:itr ...... i2iti2022 ;,;:o
3rd oii si2ii2014 <fo ··
.iiiiiair·· ·ioi2:ii201<i <.~·1"'.o"'"···--------1 1stQtr 3/11/2015 <1.0 2nd air sh&201s <1.0 3rd Qtr. . 9/312015 <1.0
4itii:iii 10,21i2015,+•~1c.;:o;...· ------+' ""-----+=----+-·c'-=-------f------'== 1stQtr 3/11/2016 <1.0 2n<idir si2ili2ois •i:o 3rd aii · 1i2B12ois ;, i:o -itiidir . . .. ioi2iii201e •1.o
0.2 O::is1 0.436 . ·0452
0.304 0.419 0.521 . 0.631
0.723
1---------'0.626 0.673 .. 0699
0.670
o:ss1 0.740 0.662 ... 0527
1---------'0.559 0.574 ·o:aio 0.525 . 0.524
0.595 .... 0.699
o)ao
1-------""""'o:tsa 0.991 . Tii1 . {2
!---------"1.23 fj . 1.6
i:61 i.79
DuplicateTW4-70 <1.0 < . '---+'-'"',------+:-'-":-------+-----~,'-;-l-------...:;c~ 1stQtr 3/15/2017 <1.0 <1.0 < 2ii<iair . 6/1si2ii1i<1.o <1:0 <1 3rdo1r · · · · · · sii/2011 •ff·· •1.0 · · · · ······ .,
4th Qtr . i6iioi26ii ·•.1.0 . . .. . . {ii .. <1 ~----+=',------!-------'~cl--------"'-'=' 1stQtr ········· ·· ·· · 3114/2018 <1.0 1.0 <1
2nd oir · sifmoiii :.:10 .:1.0 <i :iri:l air ai2iii2oia <1.0 · <1:6 .:1
4iiiafr .. ····· 12ii212"'ii.,_,is<i-::<1-":o,,_··_· ------1•Lii. <1 ~-----+=',------1---------'=1--------"'" 1stQtr 3116/2019 <1.0 <1.0 ·•1
:iii,idti sifai26is <1.if <i:ci <1 3rdQtr ili11i2ofa <ff .. <1.0 ········· ..• ,:o 4iiidir ......... i2ii4i26iii <io ... :.if.ii ............. <1.o .1s! gtr ······················311112020 <1.0 ·:.·1·!-'.o"---+<"'1."'0----+~-------+--------=~!--------~~
· sii1i2020 •1.0 · «1.0 .1o ...... !iii7i26i6 <1.0 . i:ii ............ <io .
i1i./12020 <i:o i.ii •i:o 1 ---3;;,/;;;17;;;/2021 <1.0 <1.0
:ind dtr e11iii2621 <i.ii <1.ri 3rd oir ilifs12021 •ff •i:ci .iiiiiaii · · ·· 1iiai2 .:1.0 ·.:1.o'-· -----1
1s!Qtr 311612 <1.0 <1.0 2nd oir ;,1:0 <1.0 3rdai, ·· · ··· · 9113120 ·.:1.0 · ····· ·.:1.0
4iiii:iti un12022 .ff .,:o
Shaded indicates concentrations exceeding GWQS.
TW4-37
(chloroform pumping well
6/9/15)
Sampling Event
2ndQtr 618/2015
3rdQtr 9/3/2015
4thQtr 10/19/2015
1·siotr 319/2016
2ndQtr 5/23/2016
3rd Qtr-7/2512016
4th Q1r 10/12/2016
1stQtr 3/8/2017
2nd Qtr 6/151201 7
3rd Qtr 7/2612017
4thQtr 10/11/2017
1stQtr 3/12/2018
2ndQtr 6/8/2018
3rd Qtr 8/22/2018
4thQtr 11/28/2018
1stQtr 3/8/2019
2ndQtr 6/5/2019
3rd Qtr 9/4/2019
4th Qtr 12/10/2019
1s1Qtr 2/1912020
2ndQtr 5127/2020
3rd Qtr 914/2020
4th Qtr 10/28/2020
1stOtr 2123/2021
2ndOtr 6/9/2021
3rdQtr 8124/2021
4th Qtr 1211/2021
1stQtr 3191202:i'
2ndOtr 61812022
3rdQtr 813012022
4thQtr 11/30/2022
TW4-38
4thQtr 11/10/2016
1stQtr 3/15/2017
2ndQtr 6/15/2017
3rdQtr 8/2/2017
4th Qtr 10/10/2017
1stQtr 3/14/2018
2ndQtr 6/13/2018
3rd Q1r 8/30/2018
4th Qtr 12/12/2018
·i',ta1r 3/16/2019
2ndQtr 6/13/2019
Duplicate TW4-70
3rd Qtr 9/11/2019
4th Qtr 12/14/2019
1s1Qtr 3/t'712020
2ndQtr 6/11/2020
3rd Qtr 9/18/2020
4thQtr 11/4/2020
1stQtr 3/18/2021
2ndQtr 6/16/2021
Duplicate 1W4•70
3rdQ1r 9/15/2021
4th Qtr 12/8/2021
1stQtr 3/22/2022
2nd Qtr 6/16/2022
3rdQtr 9/14/2022
4th Qtr 12/7/2022
TW4-39(el'llofof0m1pumpw,gwe1
(11/2016)
4th Qtr 11/11/2016
1stQtr 3/8/2017
2ndQtr 6/15/2017
3rd Qtr 7/26/2017
4thQtr 10/10/2017
1stQtr 3/12/2018
2ndQtr 6/8/2018
3rdQtr 8/22/2018
4th Qtr 11/28/2018
1stQtr 3/8/2019
2ndQtr 6/5/2019
3rd Qtr 9/4/2019
4thQtr 12/10/2019
1stOtr 2/19/2020
2ndQtr 5/27/2020
3rd Qtr 9/18/2020
4th Qtr 10/28/2020
1s1Qtr 2/23/2021
2ndOtr 6/9/2021
3rdQtr 8/24/2021
41hQtr 12/1/2021
1stQtr 3/9/2022
2ndQtr 6/8/2022
3rd Qtr 8/30/2022
41hQtr 11/30/2022
TABLE 1 (32 of 33)
Historic Summary Of Monitoring Well Analytical Results Up To The 4th Quarter 2022
Chloroform Contamination Investigation
DUSA White Mesa Mill
Parameter
(GWQS)
Carbon Tetrachloride Chloroform Chloromethane Methylene Chloride Chloride
15 ua/Ll 170 un/LI /JO un/L\ 15 ua/Ll No GWQS lma/Ll
18.2 30,200 15.7 1.94 345
16.6 19,100 13.7 1.04 374
12.5 19 500 9.38 1.17 399
15'.8 17,500 3.57 1.34 332
14.4 16,200 3.57 1.17 389
16.7 15,900 <1.0 <1.0 294
16.3 16 400 <1.0· <1.0 304
15.4 18,000 3.57 1.34 305
16.2 15,800 <1.0 <1.0 281
15.1 15,000 <1.0 <1.0 277
12.6 15,500 2.47 <1.0 255
12.8 12,900 1.14 <1.0 263
10.6 14,400 <1.0 <1.0 275
12.1 14,100 6.2 <1.0 387
11.3 15 200 19.8 <1.0 264
13.8 13,300 1.24 <1.0 209
14.6 16,200 <1.0 <1.0 250
10.7 11,900 1.9 <1.0 228
8.81 13100 3.12 <1 .0 220
8.53 12,000 12.3 <1 .0 236
11.8 11,700 1.44 <1.00 321
9.62 13,800 <1.0 <1.0 273
6.52 10 300 29.4 <1.0 254
<1.0 9,380 <fO . <1.0 242
8.46 13,000 1.98 <1.00 176
7.65 10,200 <1.0 <1.0 220
11.5 14 800 ~] 5.05 410
12.2 13,700 <1.0 <1.0 414
8.2 46,800 12 <1.0 276
5.4 11,600 2.4 <1.0 243
5.7 9 640 <1.0 <1 .0 578
<1.0 <1 .0 <1.0 <1 .0 40
<1.0 <1 .0 <1.0 <1.0 35.7
<1.0 <1.0 <1.0 <1.0 36.2
<1.0 <1.0 <1.0 <1.0 36.9
<1.0 <1.0 <1.0 <1.0 31.3 "<fa <1 .0 <1.0 <1.0 36.5
<1.0 <1.0 <1.0 <1.0 33.1
<1.0 <1.0 <1.0 <1 .0 39.2
<1.0 <1.0 <1.0 <1 .0 35.0
<1.0 <1.0 <1.0 <1.0 33.5
<1.0 <1.0 <1.0 <1.0 33.7
<1.0 <1.0 <1.0 <1.0 35.3
<1.0 <1.0 <1.0 <1.0 31.6
<1.0 <1.0 <1.0 <1.0 36
<1.0 <1.0 <1.0 <1.0 33.4
<1.0 <1.0 <1.0 <1.0 34.9
<1.0 <1.0 <1.0 <1.0 34.7
<1.0 <1.0 <1.0 <1.0 35.1
<1.0 <1.0 <1.0 <1 .0 37.2
<1.0 <1.0 <1.0 <1.0 37.7
<1.0 <1.0 <1.0 <1.0 35.7
<1.0 <1 .0 <1.0 <1.0 32.1
<1.0 <1.0 <1.0 <1.0 35.8
<1.0 <1 .0 <1.0 <1.0 32:i
<1.0 <1.0 <1.0 <1.0 37.3
<1.0 <1.0 <1.0 <1.0 32.9
<1.0 <1.0 <1.0 <1 .0 36.4
.:'::.LP 2 800 <1.0 <1.0 68.9
8.15 6,460 <1.0 1.35 130
8.2 5,560 <1.0 1.31 120
14.4 10,000 <1.0 1.5 132
<1.0 552 <1.0 <1 .0 73.5
3.1 2,870 <1.0 <1.0 118
7.94 7,160 <1.0 <1 .0 107
12.5 8,180 2.33 <1.0 110
6.08 6 520 2.33 <1.0 123
1.2 885 <1.0 <1.0 49
11.6 8,640 <1.0 <1 .0 114
5.71 4,240 <1.0 <1.0 48.2
1.14 1 650 <1.0 <1.0 74.7
<1.0 812 <1.0 <1.0 76.5
7.56 5,870 <1.0 <1.0 8851 8.18 5,960 <1.0 <1.0 63.2
<1.0 648 1.19 <1.0 83.2
<1.0 2,970 <1.0 <1.0 53.0[
7.56 2,490 <1.0 <1.0 123
<1.0 858 <1.0 <1 .0 78 ~I <1.0 776 <1.0 <1.0 82.4
<1.0 724 <1.0 <1.0 75.2[
1.4 982 <1.0 <1.0
76:1 <1.0 843 <1.0 <1.0 85.2
1.2 1 720 <1.0 <1.0 80.6
Shaded 1nd1cates concentrations exceeding GWQS.
Nitrate, Nitrate + Nitrite
110 ma/LI
35.2
32.4
34.6
28.4
27.9
33.4
26.1
32.3
31.2
30.5
30.6
30.0
28.6
25.3
27.3
30.1
31.2
25.8
25.5
28.3
28.3
29.5
28.7
26.9
26.6
25.8
31.3
29.8
28.0
26.6
30.9
11.2
10.6
10.8
10.1
10.3
9.34
9.48
7.77
8.48
8.96
8.53
9.52
7.61
7.51
8.11
9.00
7.35
7.72
8.24
9.59
9.05
8.04
8.02
7.7
7.9
7.57
8.9
20.7
fi':44
6.25
7.74
2.65
3.33
4.84
6.05
6.39
2.08
8.45
1.75
0.95
0.792
5.01
2.69
7.03
2.12
12.0
2.70
2.33
i.'9
9.0
3.72
7.86
,.,._u
(chloroform pumping well
5/2019)
Sampling Event
TABLE 1 (33 of 33)
Historic Summary Of Monitoring Well Analytical Results Up To The 4th Quarter 2022
Chloroform Contamination Investigation
OUSA White Mesa Mill
-----Parameter
(GWQS)
Carbon Tetrachloride Chloroform Chloromethane Methylene Chloride Chloride
15 ua/LI 170 ua/LI 130 ua/LI 15 ua/LI No GWQS Imo/LI
1stQtr 3/21/2018 <1.0 248 <1.0 <1.0 35.7
2ndQtr 6/13/2018 <1.0 131 <1.0 <1.0 31.6
3rdQtr 9/5/2018 <1.0 116 <1.0 <1.0 37.6
4th Qtr 12/12/2018 <1.0 118 <1.0 <1.0 29.9
□uyrate TW4-75 <1.0 119 <1.0 <1.0 32.3 f2 E f Otr 3/20/2019 <1.0 111 <1.0 <1.0 30.9 2nd Qtr _____ 6/5/2019 <1.0 -----------263 <T.O ______ <1 .□--------35.6
3rdQtr 9/4/2019 <1.0 380 <1.0 <1.0 35.9
4th Qtr 12/10/2019 <1.0 314 <1.0 <1.0 36.7
1st0tr 2/19/2020 <1.0 364 <1.0 <1.0 38.5
2ndQtr 5/27/2020 <1.0 367 <1.0 <1.0 36.5
3rdOtr 9/4/2020 <1.0 333 <1.0 <1.0 34.2
4thOtr 10/28/2020 <1.0 264 <1.0 <1.0 34.6
1stOtr 2/23/2021 <1.0 436 3.51 <1.0 36.0
2ndQtr 6/9/2021 <1.0 343 <1.0 <1.0 27.5
3rdOtr 8/24/2021 <1.0 301 1.32 <1.0 31.8
4thQtr 12/1/2021 <1.0 286 <1.0 <1.0 38.4
1stQtr 3/9/2022 <1.0 238 <1.0 <1.0 36.8
2ndOtr 6/8/2022 <1.0 323 <1.0 <1.0 36.6
3rd Qtr 8/30/2022 <1.0 302 <1.0 <1.0 39.3
4thQtr 11/30/2022 <1.0 298 <1.0 <1.0 44.8
TW4-41 (chlorolorm pumping well
512018)
2ndQtr 5/8/2018 <1.0 1,400 <1.0 <1.0 42.8
3rd Otr 8/22/2018 <1.0 1,390 <1.0 <1.0 45.5
4thQtr 11/28/2018 <1.0 1 320 <1.0 <1.0 41.4
1stQtr 3/8/2019 <1.0 1,220 <1.0 <1.0 39.1
2ndOtr 6/5/2019 <1.0 1,320 <1.0 <1.0 38.1
3rd Qtr 9/4/2019 <1.0 1,190 <1.0 <1.0 39.4
4thQtr 12/10/2019 <1.0 1410 <1.0 <1.0 42.1
1stQtr 2/19/2020 <1.0 1,200 <1.0 <1.0 44.4
2ndQtr 5/27/2020 <1.0 1,220 <1.0 <1.0 41.7
3rdQtr 9/4/2020 <1.0 1,110 <1.0 <1.0 40.2
4thQtr 10/28/2020 <1.0 1 020 <1.0 <1.0 39.7
1stQtr 21:fa12021 <1.0 1,170 <1.0 <1.0 40.6
2ndQtr 6/9/2021 <1.0 1,130 <1.0 <1.0 39.5
3rdQtr 8/24/2021 <1.0 1,100 <1.0 <1.0 37.1
4th Qtr 12/1/2021 <1.0 1,030 <1.0 <1.0 43.2
1stQtr 3/9/2022 <1.0 1,030 <1.0 <1.0 37.3
2nd Otr 6/8/2022 <1.0 1,010 <1.0 <1.0 41.1
3rdQtr 8/30/2022 <1.0 1,060 <1.0 <1.0 41.9
4th Qtr 11/30/2022 <1.0 1 050 <1.0 <1.0 38.0
TW4-42
2nd Qtr 6/19/2019 <1.0 <1.0 <1.0 <1.0 23.3
3rdQtr 9/11/2019 <1.0 <1.0 <1.0 <1.0 20.6
4th Qtr 12/10/201 9 <1.0 <1.0 <1.0 <1.0 22.6
Ouclicate TW4-75 <1.0 <1.0 <1.0 <1.0 22.6
1Statr 2/17/2020 <1.0 <1.0 <1.0 <1.0 23.2
2nd Qtr 6/10/2020 <1.0 <1.0 <1.0 <1.0 23.1
3rdQtr 9/17/2020 <1.0 <1.0 <1.0 <1.0 23.5
4th_Qtr 11/4/2020 <1.0 <1.0 <1.0 <1.0 22.4
1stQtr 3/17/2021 <1.0 <1.0 <1.0 <1.0 24.2
2nd Qtr 6/15/2021 <1.0 <1.0 <1.0 <1.0 24.6
3rdQtr 9/15/2021 <1.0 <1.0 <1.0 <1.0 16.6
4th Qtr 12/9/2021 <1.0 <1.0 <1.0 <1.0 24.2
1stQtr 3/15/2022 <1.0 <1.0 <1.0 <1.0 21.5
Duplicate TW4-65 <1.0 <1.0 <1.0 <1.0 17.7
2nd Otr 6/15/2022 <1.0 <1.0 <1.0 <1.0 24.0
3rd Qtr 9/13/2022 <1.0 <1.0 <1.0 <1.0 15.6
4thOtr 12m 2022 <1.0 <1.0 <1.0 <1.0 36.4
TW4-43
4thOtr 12/9/2021 <1.0 <1.0 <1.0 <1.0 40.6
1stQtr 3/17/2022 <1.0 <1.0 <1.0 <1.0 39.2
2ndQtr 6/16/2022 <1.0 <1.0 <1.0 <1.0 41.8
3rdQtr 9/13/2022 <1.0 <1.0 <1.0 <1.0 43.1
4thQtr 12m 2022 <1.0 <1.0 <1.0 <1.0 40.7
Shaded indicates concentrations exceeding GWQS.
(2) Chloroform _pumin!Lwell started in M~ 2019 ______ •
Nitrate, Nitrate + Nitrite
110 mo/LI
3.08
3.33
3.22
3.54
3.18
3.18
3.55
3.39
2.89
2.98
2.91
2.88
2.58
2.43
3.77
1.50
2.60
2.5
1.90
2.22
2.24
6.54
6.13
6.02
6.71
6.00
6.22
6.11
6.12
6.78
6.69
6.25
6.41
7.45
3.77
6.72
6.2
6.0
5.92
6.0
2.57
2.75
2.82
2.95
2.88
3.23
3.65
2.77
3.15
3.57
3.26
2.02 2s
2.6
3.3
3.3
2.02
0.118
0.4
0.24
0.383
0.383
Parameter GWQS
Chloride none
Nitrate + Nitrite (as N) 10 m!J/L
Chloroform 70 ua/L
Carbon tetrachloride 5 µa/L
Chloromethane 30 u~/L
Methvlene Chloride 5 un/L
nc = not calculated
Table 2
Summary of EFR QA/QC Samples
4th Quarter 2022
Duplicate Samples of Wells
Duplicate ofTW4-12 Duplicate of TW4-9
TW4-12 TW4-65 RPO TW4-9 TW4-70 RPO
49.2 50.9 -3.4 33.2 58.5 -55.2
4.68 7.02 -40.0 0.676 0.66 2.4
<1 .0 <1 .0 nc 6.7 6 11 .0
<1 .0 <1.0 nc <1 .0 <1 .0 nc
<1 .0 <1 .0 nc <1 .0 <1.0 nc
<1 .0 <1 .0 nc <1.0 <1.0 nc
High lighted exceeding PRO (Relitve % difference) of 20%
Duplicate of TW4-18
TW4-29 TW4-75 RPO
44.4 45.2 -1 .8
3.60 3.63 -0.8
62.6 67.9 -8.1
<1 .0 <1 .0 nc
<1 .0 <1 .0 nc
<1 .0 <1 .0 nc
Well ID MW4 MW-26 TW4-1
C1>chloroform (ug/L) 1,170 1,040 1,010
Chloroform (g/L) 1.17E-03 1.04E-03 1.01E-03
Chloroform (lbs/L) 2.59E-06 2.30E-06 2.23E-06
Chloroform (lbs/aall 9.78E-06 8.70E-06 8.45E-06
Total gallons pumped 91 ,487.4 29,411 .4 8,450.8
lbs of chloroform removed 0.9 0.3 0.07
Gallons of chloroform removed 0.07 0.02 0.01
total lbs of chloroform removed 15.1
total aallons of chloroform removed 1.2
Tabel3
Chloroform Mass Removal Calculations for the 4th Qurater 2022
EFR White Mesa Mill, Bland, Utah
TW4-2 TW4-4 TW4-11 TW4-19 TW4-21 TW4-22
1,030 1,030 2,900 7,380 482 2,350
1.03E-03 1.03E-03 2.90E-03 7.38E-03 4.82E-04 2.35E-03
2.28E-06 2.28E-06 6.41E-06 1.63E-05 1.06E-06 5.19E-06
8.61E-06 8.61E-06 2.43E-05 6.17E-05 4.03E-06 1.97E-05
12,148.6 8,777.0 1,442.4 137,474.5 94,463.6 22,398.4
0.10 0.1 0.03 8.5 0.4 0.4
0.01 0.01 0.00 0.69 0.03 0.04
1) Assuming that the chloroform concentration result for the quarter monitoring event is the average chloroform concentration for the entire quarter.
TW4-24 TW4-25 TW4-37 TW4-39 TW4-40 TW4-41
79.5 0 9,640 1,720 298 1,050
7.95E-05 0.00E+00 9.64E-03 1.72E-03 2.98E-04 1.05E-03
1.76E-07 0.00E+00 2.13E-05 3.80E-06 6.58E-07 2.32E-06
6.65E-07 0.00E+00 8.06E-05 1.44E-05 2.49E-06 8.78E-06
100,289.8 95,056.0 43,251 .9 39,072.6 48,263.2 11,722.6
0.067 0.00 3.5 0.6 0.12 0.1
0.005 0.00 0.28 0.05 0.01 0.01
,