DRC-2022-021120 - 0901a068810eae8c

Department of
Environmental Quality
State of Utah
Kimberly D. Shelley
Executive Director
SPENCER J. COX
Governor
DIVISION OF WASTE MANAGEMENT
AND RADIATION CONTROL
DEIDRE HENDERSON
Lieutenant Governor
Douglas J. Hansen
Director
TO:
FROM:
DATE:
MEMORANDUM
Phil Goble PP / 7"" /. / /l.,,ft? 1/"J.1/2022-
Dean Henderson J'J~.A 7 L L V/1 /2-1 /Z..~ 2 z_
July 26, 2022
SUBJECT: Review of the May 4, 2022 1st 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 May 4,
2022, 1st Quarter, 2022 Chloroform Monitoring Report ("Report") for the Chloroform Contamination
Investigation. For the review ofthis 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 III.C requires the 1st Quarter Report to be submitted to the Division on or before June 1, of
each year. The Report was received by the Division on May 10, 2022 (date of Report
May4, 2022) which meets the GCAP requirement.
Monitor Well Sampling
The following 43 monitor wells were sampled as required in the GCAP (see Table 1 below):
MW-4 TW4-3 TW4-8 TW4-13 TW4-21 TW4-26 TW4-31 TW4-36 TW4-41
MW-26 TW4-4 TW4-9 TW4-14 TW4-22 TW4-27 TW4-32 TW4-37 TW4-42
MW-32 TW4-5 TW4-10 TW4-16 TW4-23 TW4-28 TW4-33 TW4-38 TW4-43
TW4-1 TW4-6 TW4-11 TW4-18 TW4-24 TW4-29 TW4-34 TW4-39
TW4-2 TW4-7 TW4-12 TW4-19 TW4-25 TW4-30 TW4-35 TW4-40
DRC-20 195 North 1950 West• Salt Lake City, UT
Mailing Address: P.O. Box 144880 • Salt Lake City, UT 84114-4880
Telephone [phone] • Fax [phone] • T.D.D. [phone]
www.deq.utah.gau
Printed on 100% recycled paper
DRC-2022-021120
Page2
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 1st
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, TW4-1, TW4-2, TW4-4, TW4-l l, 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
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.
Page 3
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 TW4-42 and its duplicate sample TW4-65, and
TW4-23 and its duplicate sample TW4-70; and TW4-10 and its duplicate sample TW4-75. All analytical
results for the three sample/duplicate pairs were within the 20% relative percent difference (RPD).
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 1st Quarter 2021 is 8.4 lbs. (see Table 3 below) which is more than the estimated 16.0 lbs.
removed in the 4th Quarter 2021. The lesser mass removal is a primarily due to decrease in
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 711 lbs. in the 1st Quarter, 2022. This
approximately 270 lbs. less than the 4th Quarter 2021 estimated mass of 981 lbs.
As per Part 111.B.2 of the GCAP, the electronic files were used in 1st 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 1st Quarter, 2022 and corresponding log equivalent values.
• Surfer® griding parameters: kriging parameters: SURFER™ 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
Page4
• Surf er 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 111.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.
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.
Page5
Evaluation of the Chloroform Contaminate Plume and Its Associated Contaminants
Bounding Chloroform Plume
Groundwater monitoring data up to the 1st 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 of70µg/L]
Six (6) PM wells still exceed 70 µg/L: TW4-7, TW4-IO, TW4-16, TW4-26, TW4-29, and TW4-30
Compliance Monitor Wells ("CM") [Wells with Chloroform Concentrations between< I and 70µg/L]
Seven (7) CM wells range with detectable chloroform concentration but still below 70µg/L: TW4-5,
TW4-6, TW4-8, TW4-9, TW4-18, TW4-27, and TW4-33.
CM Wells Below the Laboratory Chloroform Detection Limit (<1.0 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 1st Quarter, 2022, 14 pumping wells MW-4, MW-
26, TW4-l, TW4-2, TW4-4, TW4-11, TW4-19, TW4-21 TW4-22, TW4-24, TW4-37, TW4-39, TW4-
40, and TW4-41 exceed chloroform concentrations of70 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 (40.4 mg/L) and TW4-24 (36.2 mg/L) exceed the nitrate GWQS of IO 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 (21.3 mg/L) continue to exceed the nitrate GWQS of IO mg/I. 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 1st quarter 2022
below the nitrate GWQS of 3.IO mg/L, 3.0 mg/L, and 0.4 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.
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 EFR of the review and closing out of for the May 4, 2022, I st Quarter,
2022 Chloroform Monitoring Report for the chloroform contamination investigation.
Page6
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 1st (January through March)
Quarter 2022, May 4. 2022 (DRC-2021-009022)
Page7
Tables 1 through 3
MW4 (chloroform pumping well
started pumping 31W3)
Sampling Event
TABLE 1 (1 of 33)
Historic Summary Of Monitoring Well Analytical Results Up To The 1st Quarter 2022
Chloroform Contamination Investigation
DUSA White Mesa Mill
Parameter
(GWQS)
Carbon Tetrachloride Chloroform Chloromethane Methylene Chloride Chloride
(5 µg/L) (70 µg/L) (30 µg/L) (5 µq/Ll No GWQS (mq/L)
1stQtr 3/16/2005 NA 2,900 NA
2ndQtr 5/25/2005 NA 3,170 NA
3rd Qtr 8/31/2005 <10 3,500 <10
4thQtr 12/7/2005 <50 3,000 <50
1stQtr 3/9/2006 <50 3,100 <50
2nd Qtr 6/14/2006 <50 3,000 <50
3rd Qtr 7/20/2006 <50 2,820 <50
4thQtr 11/8/2006 2.1 2 830
1stQtr 2/28/2007 1.6 2,300 <1.0
2nd Qtr 6/27/2007 1.8 2,000 <1.0
3rdQtr 8/15/2007 1.9 2,600 <1.0
4thQtr 10/10/2007 1.7 2 300 <1.0
1stQtr 3/28/2008 1.7 2,400 <1.0
2nd Qtr 6/25/2008 1.8 2,500 <1.0
3rdQtr 9/10/2008 1.8 1,800 <1.0
4thQtr 10/15/2008 1.7 2100 <1.0
1stQtr 3/4/2009 1.5 2,200 <1.0
2nd Qtr 6/23/2009 1.3 1,800 <1.0
3rdQtr 9/14/2009 1.4 2,000 <1.0
4th Qtr 12/14/2009 1.6 1800 <1.0
1stQtr 2/17/2010 1.2 1,600 <1.0
2nd Qtr 6/14/2010 1.2 2,100 <1.0
3rdQtr 8/6/2010 1.5 1,900 <1.0
4th Qtr 10/15/2010 1.4 1 500 <1.0
1stQtr 2/23/2011 1.5 1,700 <1.0
2nd Qtr 6/1/2011 1.4 1,700 <1.0
3rdQtr 8/17/2011 11 1,700 <1.0
4th Qtr 11/16/2011 1.3 1600 <1.0
1sTQ!i'[1J __ 1/23/2012 1 1,500 <1.0 1-------------2nd Qtr 6/6/2012 1.2 1,400 <1.0
3rd Qtr 9/4/2012 1.5 1,500 <1.0
4th Qtr 10/4/2012 1 1 300 <1.0
1stQtr 2/11/2013 1.48 1,670 <1.0
2nd Qtr 6/5/2013 1.31 1,490 <1.0
3rdQtr 913/2013 1.13 1,520 <1.0
4thQtr 10/29/2013 5.58 1410 <1.0
1stQtr 1/27/2014 4.15 1,390 <1.0
2nd Qtr 5/19/2014 5.21 1,390 <1.0
3rdQtr 8/11/2014 7.6 1,490 <1.0
4th Qtr 10/21/2014 <1.0 ____ 1.,1,_4Q <1.0
1st Qtr (2) 3/9/2015
,_ ___________
<1.0 1.26 1,400
2nd Qtr 6/8/2015 <1.0 1,300 <1.0
3rdQtr 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
1st Qtr 3/8/2017 1.22 1,450 <1.0
2nd Qtr 6/13/2017 1.15 1,430 <1.0
3rdQtr 7/26/2017 1.15 1,400 <1.0
4th Qtr 10/11/2017 <1.0 1,320 <1.0
DWMRC sclit sample <19 1400 <30
1st Qtr 3/12/2018 1.07 1,320 <1.0
2nd Qtr 6/8/2018 <1.0 1,240 <1.0
3rdQtr 8/22/2018 <1.0 1,300 <1.0
4th Qtr 11/28/2018 <1.0 1330 <1.0
1stQtr 3/8/2019 <1.0 1,190 <1.0
2nd Qtr 6/5/2019 <1.0 1,300 <1.0
3rdQtr 9/4/2019 <1.0 1,180 <1.0
4th Qtr 12/10/2019 <1.0 1 370 <1.0
1stQtr 2/19/2020 <1.0 1,230 <1.0
2nd Qtr 5/27/2020 <1.0 1,250 <1.0
3rdQtr 9/4/2020 <1.0 1,240 <1.0
4th Qtr 10/18/2020 <1.0 1 050 <1.0
1stQtr 2/23/2021 <1.0 1,150 <1.0
2nd Qtr 6/9/2021 <1.0 1,320 <1.0
3rdQtr 8/24/2021 <1.0 1,140 <1.0
4th Qtr 12/1/2021 <1.0 1100 <1.0
1stQtr 3/9/2022 <1.0 1 040 <1.0
MW-4At I VV4•A)
1stQtr 3/16/2005 NA 3,700 NA
2nd Qtr 5/25/2005 NA 3,740 NA
3rdQtr 8131/2005 <10 3,800 <10
4th Qtr 1217/2005 <50 3,000 <50
1stQtr 3/9/2006 <SO 3,700 <50
2nd Qtr 6/14/2006 <SO 3,300 <SO
3rd Qtr 7/20/2006 <50 3,190 <SO
4th Qtr 11/8/2006 2.4 3 370 <1.0
1stQtr 2/28/2007 1.9 2,500 <1.0
(1) As of March 2012 both north and south WIid life ponds no longer receiving water
(2) chloroform pumping wells lW4•1, TW4-2, and TW4-11 started in 1/14/15 __
NA "' not analyzed
Shaded indicates concentrations exceeding GWQS.
Bold and italics indicates the MDL exceeded the GWQS.
J "' Approximated value
NA NA
NA NA
<10 NA
<50 53
<50 49
<50 49
<50 48
1.4 <1.0 50
<1 .0 47
<1.0 45
<1.0 47
<1 .0 45
<1.0 42
<1.0 42
<1.0 35
<1.0 45
<1 .0 37
<1.0 34
<1 .0 43
<1.0 44
<1.0 45
<1.0 41
<1.0 38
<1.0 41
<1.0 40
<1 .0 35
<1.0 41
<1 .0 40
<1.0 41.0
<1 .0 39.0
<1 .0 41.0
<1 .0 41.0
<1.0 37.8
<1.0 44.0
<1.0 41.4
<1.0 40.1
<1.0 38.5
<1.0 39.9
<1.0 41.0
<1.0 41.5
<1.0 40.7
<1.0 43.1
1.42 <1.0 44.3
<1 .0 40.8
<1 .0 42.2
<1 .0 43.7
<1 .0 42.5
<1 .0 44.8
<1.0 43.3
<1 .0 44.0
<1.0 43.8
<1 .0 43.8
70 J 43.0
<1 .0 46.2
<1 .0 43.5
<1.0 48.5
<1 .0 43.1
<1 .0 41.5
<1 .0 40.6
<1 .0 41.9
<1 .0 45.5
<1 .0 48.1
<1.0 40.7
<1.0 43.8
<1 .0 41.4
<1 .0 46.5
<1 .0 34.8
<1 .0 43.2
<1 .0 47.6
<1.0 40.9
NA NA
NA NA
<10 NA
<50 55
<50 53
<SO 54
<50 54
<1.0 54
<1.0 60
Well abandonded
Nitrate, Nitrate+ Nitrite
(10mq/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
4.8
4.9
5.0
4.8
4.78
4.22
4.89
5.25
4.7
4.08
3.7
5.07
5.75
2.53
4.79
4.43
5.15
4.54
4.95
4.88
4.99
4~: 4.
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
4.61
6.48
3.83
4.9(
4.8(
7.1
7.8
6.9
6.7
5.8
7.3
1.2
7.1
7.1
TABLE 1 (2 of 33)
Historic Summary Of Monitoring Well Analytical Results Up To The 1st Quarter 2022
Chloroform Contamination Investigation
DUSA White Mesa Mill
MW-26 (fom,erTW-4-15) Chloroform
pumpingwellstarte<:18/8/03
Sampling Event
Carbon Tetrachloride Chloroform Chloromethane
15 ua/L\ 170 ua/L\ 130 ua/L\
1stQtr 3/16/2005 NA 310 NA
2nd Qtr 5/25/2005 NA 442 NA
3rdQtr 8/31/2005 <5.0 960 5.4
4thQtr 1217/2005 <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 2/28/2007 <1.0 570 <1.0
2nd Qtr 6/27/2007 <1.0 300 <1.0
3rdQtr 8/15/2007 <1.0 1,400 <1.0
4th Qtr 10/10/2007 <1.0 2000 <1.0
1stQtr 3/28/2008 <1.0 930 <1.0
2nd Qtr 6/25/2008 <1.0 1,300 <1.0
3rdQtr 9/10/2008 <1.0 630 <1.0
4th Qtr 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
1stQtr 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
4thQtr 10/15/2010 <1.0 970 <1.0
1stQtr 2/23/201 1 <1.0 450 <1.0
2ndQtr 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
TscatriW i;~;~~~ 1 <1.0 1 800 <1.0
<1.0 2,400 <1.0
2nd Qtr 6/6/2012 <1.0 ---------~------3,000 <1.0
3rd Qtr 9/4/2012 <1 3,100 <1
4thQtr 10/4/2012 <1 1 200 <1
1stQtr 2/11/2013 <1 2,120 <1
2ndQtr 6/5/2013 <1.0 4,030 <1.0
3rd Qtr 9/3/2013 <1.0 2,940 <1.0
4thQtr 10/29/2013 <1.0 1 410 <1
1stQtr 1/27/2014 <1.0 1,400 <1.0
2ndQtr 5/19/2014 <1.0 1,960 <1.0
3rd Qtr 8/11/2014 <1.0 2,120 8.7
4thQtr 10/21/2014 <1.0 2 090 <1.0
1stQtr 3/9/2015 <1.0 1,980 <1.0
2nd Qtr (3) 6/8/2015 <1.0 <1.0 1,980
3rd Qtr 8/31/2015 >-----2,350 :---------<1.0 4.05
4thQtr 10/19/2015 <1.0 2680
1stQtr 3/9/2016 <1.0 2,650
2ndQtr 5/23/2016 <1.0 2,220
3rd Qtr 7/25/2016 <1.0 3,190
4th Qtr(4) 10/12/2016 <1.0 2,510
1st Qtr -----3/8/2017 ~------<1.0 1,290
2ndQtr 6/13/2017 <1.0 2,450
3rd Qtr 7/26/2017 <1.0 1,230
4thQtr 10/11/2017 <1.0 2 570
1stQtr 3/12/2018 <1.0 1,210
2ndQtr 6/8/2018 <1.0 1,870
3rd Qtr 8/22/2018 <1.0 1,680
4thQtr 11/28/2018 <1.0 1480
1stQtr 3/8/2019 <1.0 1,110
2ndQtr 6/5/2019 <1.0 1,280
3rd Qtr 9/4/2019 <1.0 1,680
4thQtr 12/10/2019 <1.0 1 390
1stQtr 2/19/2020 <1.0 1,100
2nd Qtr 6/12/2020 <1.0 1,140
3rdQtr 9/4/2020 <1.0 1,130
4th Qtr 10/28/2020 <1.0 866
1stQtr 2/23/2021 <1.0 3,060
2nd Qtr 6/6/2021 <1.0 998
3rdQtr 8/24/2021 <1.0 1,580
4th Qtr 12/1/2021 <1.0 826
1stQtr 3/9/2022 <1.0 1 030
(1) VOCs were resampled because laboratory missed holding time.
(2) As of March 2012 both north and south wild lif~ p~nds no lo~er receivin[_water.
.iJlchloroform ~~~Q.!"ell TW4-37 started in 6/9/15 _ _ _ _ _ _ _ _ _ _
J.4) chioroform ~mp1nQ_wells iw4-1~4-2. andTW4-11 started in 1/14/15 __
NA= not analyzed
Shaded indicates concentrations exceeding GWQS.
Bold and italics indicates the MDL exceeded the GWQS.
1.32
<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
5.9
<1.0
Parameter
IGWQS\
Methylene Chloride
(5 µg/L)
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 1-----------21
31
4
9.34
52.4
33.2
4.03
13.8
15.4
26
23.2
27.4
11.2 1----------11.6
8.28
4.66
4.57
7.81
4.31 1------~--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
Chloride
No GWQS (mg/L)
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 1----------73
73
68
81.9
77.9
60.5
72.3
59.4
53.4
59
60.1
56.5
62
I-----------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
Nitrate, Nitrate + Nitrite
(10 mg/L)
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
0.2
6.8
0.6
0.7
0.5
0.4
0.9
2.0
NA
1.7
2.5
2.6
1.8
2.27
2.11
1.18
138
0.55
0.93
0.7
0.93
0.73
0.42 ►-----------0.68
0.991
1.45
1.12
1.57
1.18 ---------0.768
0.922
1.56
1.18
1.57
0.901
2.80
1.96
1.85
2.83
308
0.977
1.17
2.93
0.42
3.62
0.349
0.81
0.671
0.52
0.3
MW-32 (fomierTW4-17)
Sampling Event
TABLE 1 (3 of 33)
Historic Summary Of Monitoring Well Analytical Results Up To The 1st Quarter 2022
Chloroform Contamination Investigation
DUSA White Mesa Mill
Parameter
(GWQS)
Carbon Tetrachloride Chloroform Chloromethane Methylene Chloride Chloride Nitrate, Nitrate+ Nitrite
15 uo/L\ 170 ua/L\ 130 ua/L\ (5 ~g/L) No GWQS (mg/L) (10 mg/L)
1stQtr 3/16/2005 NA <1.0 NA NA NA <0.1
2nd Qtr 5/25/2005 NA <1.0 NA NA NA <0.1
3rdQtr 8/31/2005 <1.0 <1.0 3.2 <1.0 NA <0.1
14th Qtr 1W/2005 <1.0 <1.0 <1.0 <1.0 33 <0.1
1stQtr 3/9/2006 <1 .0 <1.0 <1.0 <1.0 32 <0.1
2nd Qtr 6/14/2006 <1.0 <1.0 3.5 <1.0 30 <0.1
3rd Qtr 7/20/2006 <1.0 <1.0 1.8 <1.0 32 <1.0
4th Qtr 11/8/2006 <1.0 <1.0 1.5 <1.0 31 <.1
1stQtr 2/28/2007 <1 .0 <1.0 <1 .0 <1.0 32 <1.0
2nd Qtr 6/27/2007 <1.0 <1.0 <1.0 <1.0 32 <1.0
3rdQtr 8/15/2007 <1.0 <1.0 <1.0 <1.0 31 <1 .0
14th Qtr 10/10/2007 <1.0 <1.0 <1.0 <1.0 32 <1 .0
1stQtr 3/28/2008 <1.0 <1.0 <1.0 <1.0 31 <.1
2nd Qtr 6/25/2008 <1 .0 <1.0 <1 .0 <1.0 29 <1.0
3rdQtr 9/10/2008 <1.0 <1.0 <1.0 <1.0 30 <1 .0
4th Qtr 10/15/2008 <1 .0 <1.0 <1.0 <1.0 26 <0.05
1stQtr 3/4/2009 <1.0 <1.0 <1.0 <1.0 30 <.1
2nd Qtr 6/23/2009 <1.0 <1.0 <1.0 <1.0 31 <0.1
3rdQtr 9/14/2009 <1 .0 <1.0 <1.0 <1.0 33 <0.1
4th Qtr 12/16/2009 <1.0 <1.0 <1.0 <1.0 35 <0.1
1stQtr 2/17/2010 <1 .0 <1.0 <1 .0 <1.0 38 <0.1
2nd Qtr 6/14/2010 <1 .0 <1.0 <1.0 <1.0 32 <0.1
3rdQtr 8/16/2010 <1 .0 <1.0 <1.0 <1.0 28 <0.1
4th Qtr 10/15/2010 <1 .0 <1.0 <1.0 <1.0 24 <0.1
1stQtr 2/23/2011 <1.0 <1.0 <1.0 <1.0 40 <0.1
2nd Qtr 5/25/2011 <1 .0 <1.0 <1 .0 <1.0 31 <0.1
3rdQtr 8/18/2011 <1 .0 <1.0 <1 .0 <1.0 33 <0.1
4th Qtr 11/16/2011 NA NA NA NA 32 <0.1
1srorr{Jl 12/7/2011 <1 .0 <1.0 <1.0 <1.0 NA NA
1/18/2012 <1.0 <1.0 <1.0 <1.0 21 <0.1
2nd Qtr 6/22/2012 <1 .0 <f"□-----<1.0 ~1.0 ---------32 <0.1
3rdQtr 9/5/2012 <1.0 <1.0 <1 .0 <1.0 33 <0.1
4th Qtr 10/10/2012 <1.0 <1.0 <1.0 <1.0 35 <0.1
1stQtr 2/11/2013 <1 .0 <1.0 <1.0 <1.0 34.3 <0.1
2nd Qtr 6/18/2013 <1.0 <1.0 <1 .0 <1.0 34.9 <0.1
3rd Qtr 9/3/2013 <1 .0 <1.0 <1.0 <1.0 33 <0.1
4th Qtr 10/29/2013 <1 .0 <1.0 <1 .0 <1.0 35.7 <0.1
1stQtr 1/29/2014 <1.0 <1.0 <1.0 <1.0 34 <0.1
2nd Qtr 5/23/2014 <1 .0 <1.0 <1.0 <1.0 39.7 <0.1
3rdQtr 8/26/2014 <1.0 <1.0 <1 .0 <1.0 34 <0.1
4thQtr 10/29/2014 <1.0 <1.0 <1.0 <1.0 34.9 <0.1
1stQtr 3/17/2015 <1 .0 <1.0 <1.0 <1.0 36.3 <0.1
2nd Qtr 6/11/2015 <1.0 <1.0 <1.0 <1.0 35.8 <0.1
3rdQtr 9/9/2015 <1.0 <1.0 <1.0 <1.0 37.7 <0.1
4thQtr 10/28/2015 <1 .0 <1.0 <1.0 <1.0 34.7 <0.1
1stQtr 3/22/2016 <1.0 <1.0 <1.0 <1.0 36.7 <0.1
Duplicate TW4-70 <1 .0 <1.0 <1.0 <1.0 37.7 0.119
2nd Qtr 6/8/2016 <1.0 <1.0 <1 .0 <1.0 36.4 <0.1
Duplicate TW4-70 <1.0 <1.0 <1.0 <1.0 37.7 <0.1
3rdQtr 8/19/2016 <1 .0 <1.0 <1.0 <1.0 35.7 <0.1
4th Qtr 10/31/2016 <1.0 <1.0 <1.0 <1.0 36.9 <0.1
1stQtr 3/21/2017 <1 .0 <1.0 <1.0 <1.0 33.7 <0.1
2nd Qtr 6/21/2017 <1 .0 <1.0 <1.0 <1.0 37.2 <0.1
3rd Qtr 8/8/2017 <1.0 <1.0 <1 .0 <1.0 38.1 <0.1
4thQtr 10/12/2017 <1 .0 <1.0 <1.0 <1.0 32.6 <0.1
1stQtr 3/15/2018 <1 .0 <1.0 <1.0 <1.0 39.4 <0.1
Duplicate TW4-70 <1.0 <1.0 <1.0 <1.0 39.3 <0.1
2nd Qtr 6/14/2018 <1 .0 <1.0 <1.0 <1.0 34.4 <0.1
3rd Qtr 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 3/19/2019 <1 .0 <1.0 <1.0 <1.0 35.3 <0.1
2ndQtr 6/18/2019 <1 .0 <1.0 <1.0 <1.0 36.5 <0.1
3rd Qtr 9/11/2019 <1 .0 <1.0 <1.0 <1.0 41 .2 <0.1
4thQtr 12/18/2019 <1 .0 <1.0 <1.0 <1.0 36.3 <0.1
1stQtr 3/18/2020 <1 .0 <1.0 <1 .0 <1.0 36 <0.1
Duplicate TW4-75 <1 .0 <1.0 <1 .0 <1.0 34.8 <0.1
2ndQtr 6/12/2020 <1 .0 <1.0 <1 .0 <1.0 35.6 <0.1
3rd Qtr 9/18/2020 <1 .0 <1.0 <1.0 <1.0 34.7 <0.1
4th Qtr 11/4/2020 <1 .0 <1.0 <1.0 <1.0 31.3 <0.1
Duolicate TW4-65 <1 .0 <1.0 <1 .0 <1.0 35.9 <0.1
°fstQtr 3/18/2020 <1 .0 <1.0 <1.0 <1.0 36.8 <0.1
Duplicate TW4-75 <1 .0 <1.0 <1 .0 <1.0 37.4 <0.1
2nd Qtr 6/17/2021 <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
3rd Qtr 9/23/2021 <1 .0 <1.0 <1 .0 <1.0 35.3 <0.1
Duplicate TW4-75 <1.0 <1.0 <1 .0 <1.0 35.5 <0.1
4th Qtr 12/9/2021 <1 .0 <1.0 <1.0 <1.0 35.8 <0.1
1stQtr 3/22/2022 <1.0 <1.0 <1 .0 <1.0 28.6 <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 receiving water.
NA '"' not analyzed
Shaded indicates concentrations exceeding GWQS.
TABLE 1 (4 of 33)
Historic Summary Of Monitoring Well Analytical Results Up To The 1st Quarter 2022
Chloroform Contamination Investigation
OUSA White Mesa Mill
TW4• 1 {ehlorofo,m pumping well
started in 1/14/15)
Sampling Event
Carbon Tetrachloride Chloroform Chloromethane
(5 ug/L) (70 ug/L) (30 ug/L)
1stQtr 3/16/2005 NA 2,700 NA
2nd Qtr 5/25/2005 NA 3,080 NA
3rd Qtr 8/31/2005 <10 2,900 <10
4th Qtr 12/7/2005 <50 2,400 <50
1stQtr 3/9/2006 <50 2,700 <50
2nd Qtr 6/14/2006 <50 2,200 <50
3rdQtr 7/20/2006 <50 2,840 <50
4th Qtr 11/8/2006 1.4 2260 <1.0
1stQtr 2/28/2007 1.2 1,900 <1.0
2nd Qtr 6/27/2007 1.4 1,900 <1.0
3rdQtr 8/15/2007 1.3 2,300 <1.0
4th Qtr 10/10/2007 1.3 2 000 <1.0
1stQtr 3/28/2008 1.3 2,000 <1.0
2nd Qtr 6/25/2008 1.1 1,900 <1.0
3rdQtr 9/10/2008 1.3 1,700 <1.0
4th Qtr 10/15/2008 1.3 1 700 <1.0
1stQtr 3/11/2009 1.1 1,700 <1.0
2nd Qtr 6/23/2009 1 1,500 <1.0
3rd Qtr 9/14/2009 <1.0 1,700 <1.0
4thQtr 12/29/2009 <1.0 1 400 <1.0
1stQtr 3/3/2010 <1.0 1,300 <1.0
2nd Qtr 6/14/2010 1.2 1,600 <1.0
3rd Qtr 8/18/2010 1 1,600 <1.0
4thQtr 10/15/2010 <1.0 1 500 <1.0
1stQtr 2/24/2011 <1.0 1,300 <1.0
2ndQtr 6/1/2011 <1.0 1,200 <1.0
3rd Qtr 8/18/2011 <1.0 1,300 <1.0
4thQtr 11/29/2011 <1.0 1 500 <1.0 Tsrov12, 112412012 <1.0 ----1,300 <1.0 ------2nd Qtr ----6/14/2012 <1.0 1,000 <1.0
3rd Qtr 9/28/2012 <1.0 1,000 <1.0
4thQtr 10/4/2012 <1.0 1100 <1.0
1stQtr 2/13/2013 3.66 1,320 <1.0
2nd Qtr 6/19/2013 <1.0 1,100 <1.0
3rd Qtr 9/3/2013 <1.0 1,150 <1.0
4thQtr 11/14/2013 <1.0 1280 <1.0
1stQtr 2/5/2014 5.47 1,090 <1.0
2ndQtr 5/23/2014 4.77 1,020 <1.0
3rd Qtr 8/27/2014 <1.0 845 1.4
4th Qtr ___ 10/29/2014 <1.0 1,140 <1.0 -----------:-------:---------1st Qtr (2) 3/9/2015 <1.0 1,130 <1.0
2nd Qtr 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
1stQtr 3/9/2016 <1.0 974 <1.0
2nd Qtr 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 3/8/2017 <1.0 519 <1.0
2nd Qtr 6/13/2017 <1.0 977 <1.0
3rdQtr 7/26/2017 <1.0 958 <1.0
4th Qtr 10/11/2017 <1.0 556 <1.0
r'&\1,11' .... .,,,,," <7.6 810 <12
<1.0 70.4 <1.0
2nd Qtr 6/8/2018 <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
DWMRC solit sam le <5.0 210 <5.0
1stQtr 3/8/2019 <1.0 87.2 <1.0
2nd Qtr 6/5/2019 <1.0 1,040 <1.0
3rdQtr 9/4/2019 <1.0 894 <1.0
4th Qtr 12/10/2019 <1.0 1 070 <1.0
1stQtr 2/19/2020 <1.0 1,190 <1.0
2nd Qtr 5/27/2020 <1.0 499 <1.0
3rdQtr 9/4/2020 <1.0 1,060 <1.0
4th Qtr 10/28/2020 <1.0 924 <1.0
1stQtr 2/23/2021 <1.0 948 <1.0
2nd Qtr 6/9/2021 <1.0 957 <1.0
3rdQtr 8/24/2021 <1.0 821 1.18
4th Qtr 12/1/2021 <1.0 957 <1.0
1stQtr 3/9/2022 <1.0 946 <1.0
(1) As of March 2012 both north and south wild hfe ponds no lo,!!iler rece1v1na_water
J.21 TW4-1 concerted to a chloroform..J>}Lm~'22 well started in 1/14/15
J3lchloroform ~mp1nQ,_ well lW4-41 started in M!!t 2018. __
NA = not analyzed
Shaded indicates concentrations exceeding GWQS.
Bold and italics indicates the MDL exceeded the GWQS.
J = Approximated value
Parameter
{GWQSl
Methylene Chloride
{5 ug/Ll
NA
NA
<10
<50
<50
<50
<50
<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-----------<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
<1.0
Chloride
No GWQS {mg/Ll
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 1-----------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 t------------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
Nitrate, Nitrate+ Nitrite
{10 mg/Ll
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
6.8
7.1
5.0
6.5
6.99
6.87
7.12
7.08
7.74
6.93
4.80
6.31 ------------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
073
1.3E
4.3i
3.9(
TABLE 1 (5 of 33)
Historic Summary Of Monitoring Well Analytical Results Up To The 1st Quarter 2022
Chloroform Contamination Investigation
DUSA White Mesa Mill
TW4-2 (chlofoform pumping -ii
atarting1/14tl!5) Parameter
Sampling Event IGWQSI
Carbon Tetrachloride Chloroform Chloromethane Methylene Chloride
15 UQ/LI 170 UQ/LI 130 UQ/LI 15 uo/LI
1stQtr 3/16/2005 NA 3,700 NA NA
2nd Qtr 5/2512005 NA 3,750 NA NA
3rdQtr 8131/2005 <10 3,900 <10 <10
4th Qtr 12/7/2005 <50 3,500 <50 <50
1stQtr 3/9/2006 <50 3,800 <50 <50
2nd Qtr 611412006 <50 3,200 <50 <50
3rdQtr 7/2012006 <50 4,120 <50 <50
4th Qtr 111812006 2.3 3420 <1 .0 <1.0
1stQtr 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 8115/2007 2.2 340 <1.0 <1.0
4th Qtr 10110/2007 2.1 3 200 <1 .0 <1.0
1stQtr 3/28/2008 2.3 3,300 <1.0 <1.0
2ndQtr 6/25/2008 2.2 3,100 <1.0 <1.0
3rd Qtr 9/10/2008 2.4 2,800 <1.0 <1.0
4thQtr 10115/2008 NA #NIA NA NA
11118/2008 2.4 3 200 <2.0 <2.0
1stQtr 3111/2009 2.2 3,100 <1.0 <1.0
2ndQtr 6/23/2009 2 2,800 <1.0 <1.0
3rd Qtr 9114/2009 2 3,000 <1.0 <1.0
4thQtr 12129/2009 2 1600 <1.0 <1.0
1stQtr 313/2010 2 2,600 <1.0 <1.0
2ndQtr 6/14/2010 2.6 3,300 <1.0 <1.0
3rd Qtr 8118/2010 2.5 3,300 <1.0 <1.0
4thQtr 1011512010 2.1 3 000 <1.0 <1.0
1stQtr 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 8117/2011 1.6 2,400 <1.0 <1.0
4thQtr 11/29/2011 2.8 3 900 <1.0 <1.0
fsf0ff'{2) --1/24/2012 2 2,500 <1.0 <1.0 :--------~---------2ndQtr 6114/2012 2.1 2,500 <1.0 <1.0
3rd Qtr 914/2012 1.8 2,900 <1.0 <1.0
4thQtr 1014/2012 2 3100 <1.0 <1.0
1stQtr 2113/2013 5.17 3,580 <1.0 <1.0
2ndQtr 6119/2013 2.65 3,110 2 <1.0
3rd Qtr 9/3/2013 2.41 3,480
4thQtr 11114/2013 3.15 3 740
1stQtr 216/2014 7.1 3,180
2ndQtr 5123/2014 6.05 2,930
3rd Qtr 8127/2014 1.4 3,170
4th Qtr 10130/2014 2.6 3,580
1st Qtr (2) ---319/2015 1.44 :-------1,840
2ndQtr 618/2015 <1.0 1,650
3rd Qtr 8131/2015 <1.0 1,060
4th Qtr 10119/2015 2.6 2 070
1stQtr 3/9/2016 1.2 1,970
2ndQtr 5/23/2016 1.49 2,070
3rdQtr 7/25/2016 <1.0 1,780
4thQtr 10112/2016 <1.0 1600
1stQtr 318/2017 <1.0 1,570
2nd Qtr 6113/2017 <1.0 1,940
3rdQtr 7/26/2017 <1.0 1,310
4thQtr 10111/2017 <1.0 1,610
DWMRC split sample <19 1,200
DWMRC duolicate TW4-50 <19 1200
1stQtr 3/12/2018 <1.0 764
2nd Qtr 6/8/2018 <1.0 949
3rd Qtr 8/2212018 <1.0 980
4thQtr 1012212018 <1.0 822
1stQtr 31812019 <1.0 1,040
2nd Qtr 615/2019 <1.0 1,360
3rdQtr 914/2019 <1.0 797
4thQtr 12110/2019 <1.0 934
1stQtr 2119/2020 <1.0 1,880
2ndQtr 6110/2020 <1.0 1,070
3rdQtr 914/2020 <1.0 1,260
4th Qtr 10/28/2020 <1.0 1130
1st0tr 2/23/2021 <1.0 939
2nd Qtr 619/2021 <1.0 1,160
3rdQtr 8/24/2021 <1.0 1,150
4thQtr 1211/2021 <1.0 852
1stQtr 3117/2022 <1.0 1 020
J.1lAs of March 2012 both north and south wdd life ponds no lo!!Per recelVlnQ_water J.21 TW4-2 and TW-4-11 converted to a chloroform ~um.f!~ weU started in 1114/15
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
<1.0 <1.0
<1.0 <1.0
<1.0 <1.0
<1.0 <1.0
3.6 <1.0
<1.0 :---------<1.0
<1.0 ~---------<1.0
<1.0 <1.0
2.6 <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
<30 68 J
<30 60 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
<1.0 <1.0
<1.0 <1.0
<1.0 <1.0
<1.0 <1.0
<1.0 <1.0
Chloride
No GWQS Imo/LI
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 1-----------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
Nitrate, Nitrate+ Nitrite
110 mo/LI
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
#NIA
6.5
6.4
6.6
6.4
6.8
8.7
6.6
6.5
7.0
6.8
6.0
7.0 71
7.7
4.0
7.6
8.1
7.51
9.3
8.39
7.87
9.11
6.2
8.45 1------------5.32
4.3
3.76
5.18
5.30
5.671
4.07
607
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
TW4-3
Sampling Event
1s!Qtr 3/16/2005
2ndQtr 5/25/2005
3rdQtr 8/31/2005
4th Qtr 12/7/2005
1s!Qtr 3/9/2006
2nd Qtr 6/14/2006
3rdQtr 7/20/2006
4thQtr 11/8/2006
1s!Qtr 2/28/2007
2ndQtr 6/27/2007
3rdQtr 8/15/2007
4thQtr 10/10/2007
1stQtr 3/28/2008
2ndQtr 6/25/2008
3rd Qtr 9/10/2008
4thQtr 10/15/2008
1s!Qtr 3/4/2009
2ndQtr 6/23/2009
3rdQtr 9/14/2009
4thQtr 12/29/2009
1stQtr 2/23/2010
2ndQtr 6/14/2010
3rdQtr 8/10/2010
4thQtr 10/15/2010
1stQtr 2/15/2011
2ndQtr 5/25/2011
3rdQtr 8/17/2011
4thQtr 11/14/2011
'j'sf'Q'ti''[2) 1/17/2012
2nd Qtr ---5/31/2012
3rdQtr 8/28/2012
4thQtr 10/3/2012
1stQtr 2/7/2013
2ndQtr 6/28/2013
3rdQtr 9/3/2013
4thQtr 11/8/2013
1stQtr 1/2212014
2ndQtr 5/21/2014
3rdQtr 8/13/2014
4thQtr 10/23/2014
1s!Qtr 3/11/2015
2ndQtr 6/10/2015
Duplicate TW4-65
3rdQtr 8/13/2015
4thQtr 10/21/2015
1stQtr 3/15/2016
2ndQtr 5/25/2016
3rdQtr 7/27/2016
4thQtr 10/19/2016
1s!Qtr 3/14/2017
2ndQtr 6/14/2017
3rdQtr 7/27/2017
Duplicate 1W4-65
j,4th.Otr 10/11/2017
1st Qtr 3/14/2018
Duplicate 1W4-65
II2ndQtr 6/8/2018
3rdQtr 8/29/2018
DupHcate TW4-65
114th Qtr 11/30/2018
DuDlicate TW4-65
'{stQtr 3/13/2019
2ndQtr 6/13/2019
Duplicate 1W4--65
3rdQtr 9/11/2019
Duplicate TW4-65
4thQtr 12/12/2019
1stQtr 3/17J2020
D~plicate TW4-65
2ndQtr 6/10/2020
Duplicate TW4-65
3rdQtr 9/17/2020
4thQtr 11/4/2020
1stQtr 3/17/2021
Duplicate TW4-65
2ndQtr 6/15/2021
Duplicate TW4-65
3rdQtr 9/15/2021
Duplicate TW4-65
4thQtr 12/7/2021
lW4--65
3/15/2022
NA• not analyzed
TABLE 1 (6 of 33)
Historic Summary Of Monitoring Well Analytical Results Up To The 1st Quarter 2022
Chloroform Contamination Investigation
DUSA White Mesa Mill
Parameter
IGWQSl
Carbon Tetrachloride Chloroform Chloromethane Methylene Chloride Chloride
15 ua/Ll 170 ua/Ll l3011g/Ll 15 ua/Ll No GWQS lmg/Ll
NA <1.0 NA NA NA NA <1.0 NA NA NA
<1.0 <1.0 6.4 <1.0 NA
<1.0 <1.0 <1.0 <1.0 26
<1.0 <1.0 2.3 <1.0 26
<1.0 <1.0 1.6 <1.0 26
<1.0 <1.0 2.2 <1.0 26
<1.0 <1.0 <1.0 <1.0 23
<1.0 <1.0 <1.0 <1.0 22
<1.0 <1.0 <1.0 <1.0 23
<1.0 <1.0 <1.0 <1.0 24
<1.0 <1.0 <1.0 <1.0 27
<1.0 <1.0 <1.0 <1.0 21
<1.0 <1.0 <1.0 <1.0 19
<1.0 <1.0 <1.0 <1.0 19
<1.0 <1.0 <1.0 <1.0 22
<1.0 <1.0 <1.0 <1.0 21
<1.0 <1.0 <1.0 <1.0 20
<1.0 <1.0 <1.0 <1.0 21
<1.0 <1.0 <1.0 <1.0 22
<1.0 <1.0 <1.0 <1.0 23
<1.0 <1.0 <1.0 <1.0 24
<1.0 <1.0 <1.0 <1.0 22
<1.0 <1.0 <1.0 <1.0 26
<1.0 <1.0 <1.0 <1.0 23
<1.0 <1.0 <1.0 <1.0 23
<1.0 <1.0 <1.0 <1.0 23
<1.0 <1.0 <1.0 <1.0 23
<1.0 <1.0 <1.0 <1.0 :i1 :----------------'"'"------------------24 <1.0 <1.0 <1.0 <1.0
<1.0 <1.0 <1.0 <1.0 25
<1.0 <1.0 <1.0 <1.0 25
<1.0 <1.0 <1.0 <1.0 23.7
<1.0 <1.0 <1,0 <1.0 23.8
<1.0 <1.0 <1.0 <1.0 25
<1.0 <1.0 <1.0 <1.0 24.1
<1.0 <1.0 <1.0 <1.0 24.9
<1.0 <1.0 <1.0 <1.0 24.4
<1.0 <1.0 <1.0 <1.0 26
<1.0 <1.0 <1.0 <1.0 26.7
<1.0 <1.0 <1.0 <1.0 26.2
<1.0 <1.0 <1.0 <1.0 27.5
<1.0 <1.0 <1.0 <1.0 27.5
<1.0 <1.0 <1.0 <1.0 27.4
<1.0 <1.0 <1.0 <1.0 25.6
<1.0 <1.0 <1.0 <1.0 32.8
<1.0 <1.0 <1.0 <1.0 27.9
<1.0 <1.0 <1.0 <1.0 26.5
<1.0 <1.0 <1.0 <1.0 29.5
<1.0 <1.0 <1.0 <1.0 28.1
<1.0 <1.0 <1.0 <1.0 28.7
<1.0 <1.0 <1.0 <1.0 28.5
<1.0 <1.0 <1.0 <1.0 28.9
<1.0 <1.0 <1.0 <1.0 25.9
<1.0 <1.0 <1.0 <1.0 29.8
<1.0 <1.0 <1.0 <1.0 29.5
<1.0 <1.0 <1.0 <1.0 26.1
<1.0 <1.0 <1.0 <1.0 31.0
<1.0 <1.0 <1.0 <1.0 31.0
<1.0 <1.0 <1.0 <1.0 27.4
<1.0 <1.0 <1.0 <1.0 26.2
<1.0 <1.0 <1.0 <1.0 25.5
<1.0 <1.0 <1.0 <1.0 27.4
<1.0 <1.0 <1,0 <1.0 25.9
<1.0 <1.0 <1.0 <1.0 26.0
<1.0 <1.0 <1.0 <1.0 22.1
<1.0 <1.0 <1.0 <1.0 28
<1.0 <1.0 <1.0 <1.0 27.7
<1.0 <1.0 <1.0 <1.0 26
<1.0 <1.0 <1.0 <1.0 26.2
<1.0 <1.0 <1.0 <1.0 26.7
<1.0 <1.0 <1.0 <1.0 25.9
<1.0 <1.0 <1.0 <1.0 24.9
<1.0 <1.0 <1.0 <1.0 28.4
<1.0 <1.0 <1.0 <1.0 27.6
<1.0 <1.0 <1.0 <1.0 27
<1.0 <1.0 <1.0 <1.0 23.9
<1.0 <1.0 <1.0 <1.0 20.3
<1.0 <1.0 <1.0 <1.0 20.7
<1.0 <1.0 <1.0 <1.0 26.2
<1.0 <1.0 <1.0 <1.0 26.4
<1.0 <1.0 <1.0 <1.0 2°4'.3
Shaded indicates concentrations exceeding GWQS.
Nitrate, Nitrate+ Nitrite
110 mg/Ll
3.5
3.7
3.5
3.3
3.3
7.1
2.9
1.5
3.1
3.3
3.1
2.8
2.8
2.9
2.7
2.6
2.5
2.9
2.8
2.6
2.8
3.0
3.1
3.3
3.5
3.7
4.0
4.4
7.1
4.4
4.9
4.8
5.05
5.83
4.90
5.89
6.66
6.01
5.30
6.07
6.64
5.71
3.94
3.88
5.37
5.83
5.65
6.10
6.00
6.18
6.36
6.36
6.24
6.32
6.46
6.31
6.52
5.53
5.44
5.85
5.77
5.82
6.68
6.60
5.12
5.76
5.91
6.15
6.38
6.53
6.63
6.36
6.02
6.19
6.64
8.04
7.89
5.28
6.19
5.97
6.55 s"f
TABLE 1 (7 of 33)
Historic Summary Of Monitoring Well Analytical Results Up To The 1st Quarter 2022
Chloroform Contamination Investigation
TW4-4 (ehlorofoon pumping well
,tared In 1&tqtr2010)
Sampling Event
Carbon Tetrachloride Chloroform
15 ua/LI 170 ua/Ll
1stQtr 3/16/2005 NA 3,100
l2ndQtr 5/25/2005 NA 2,400
3rd Qtr 8/31/2005 <10 3,200
4thOtr 12/7/2005 <50 2,800
1st Qtr 3/9/2006 <50 2,900
2ndQtr 6/14/2006 <50 2,600
3rd Qtr 7/20/2006 <50 2,850
4thOtr 11/8/2006 1.7 2670
1stQtr 2/28/2007 1.5 2,200
2nd Qtr 6/27/2007 1.7 2,400
3rd Qtr 8/15/2007 1.5 2,700
4thQtr 10/10/2007 1.5 2 500
1stQtr 3/28/2008 1.6 2,800
2nd Qtr 6/25/2008 1.5 2,500
3rdQtr 9/10/2008 1.4 200
4th Qtr 10/15/2008 NA #N/A
1stQtr 11/18/2008 <2.0 2 500
1stQtr 3/4/2009 1.2 2,200
2nd Qtr 6/23/2009 1.2 1,800
3rdQtr 9/14/2009 1.1 2,000
4th Qtr 12/29/2009 1.1 950
1stQtr(2) 2/17/2010 ----------1 ----r.roo
2nd Qtr 6/14/2010 1.2 1,700
3rdQtr 8/10/2010 1.3 2,100
4th Qtr 10/15/2010 1.3 1 700
1stQtr 2/23/2011 1.4 1,800
2nd Qtr 6/1/2011 1.2 1,700
3rdQtr 8/17/2011 <1.0 1,500
4th Qtr 11/16/2011 1 1500
lsfQtiTfJ 112312012 <1.0 1,200
2nd Qtr 6/6/2012 <1.0 -------------1,500
3rd Qtr 9/4/2012 1.2 1,600
4th Qtr 10/3/2012 1 1400
1stQtr 2/11/2013 1 1,460
2nd Qtr 6/29/2013 <1.0 1,330
3rdQtr 9/3/2013 1.2 1,380
4th Qtr 10/23/2013 5.3 1360
1stQtr 1/27/2014 3.88 1,260
2nd Qtr 5/19/2014 4.94 1,220
3rdQtr 8/11/2014 4.94 1,320
4th Qtr 10/21/2014 <1.0 1,130
>----1,350 1st Qtr (4) 3/9/2015 1.05
2nd Qtr 6/10/2015 <1.0 1,280
3rdQtr 8/31/2015 <1.0 1,220
4th Qtr 10/19/2015 <1.0 1190
1stQtr 3/9/2016 <1.0 1,190
2nd Qtr 5/23/2016 121 1 780
3rdQtr 7/27/2016 <1.0 1,380
4th Qtr 10/13/2016 <1.0 1,430
1stQtr 3/8/2017 <1.0 1,290
2nd Qtr 6/13/2017 <1.0 1,290
3rdQtr 7/26/2017 <1.0 1,290
4thQtr 10/11/2017 <1.0 1120
1st Qtr 3/12/2018 <1.0 ,_ ___ 1,16.Q.
2nd Qtr (3) 6/8/2018 <1.0 1,050
3rd Qtr 8/22/2018 <1.0 1,030
4th Qtr 11/28/2018 <1.0 1140
1stQtr 3/8/2019 <1.0 1,050
2nd Qtr 6/5/2019 <1.0 1,070
3rd Qtr 9/4/2019 <1.0 989
4th Qtr 12/10/2019 <1.0 1140
1stQtr 2/19/2020 <1.0 1,100
2ndQtr 5/27/2020 <1.0 1,140
3rd Qtr 9/4/2020 <1.0 1,110
4th Qtr 10/28/2020 <1.0 979
1stQtr 2/23/2021 <1.0 1,130
2nd Qtr 6/9/2021 <1.0 1,240
3rd Qtr 8/24/2021 <1.0 1,100
4th Qtr 12/1/2021 <1.0 950
1stQtr 3/9/2022 <1.0 1 010
(1) As of March 2012 both north and south wild llt;.p;mds no lo~er rece1vmq_water
,i2l. TW4--4 converted to a Chlorofor'!! P}:~~ well stared in 1~~2010 ___ _
j3) TW4-41 installed as a Chloroform PUl'll£1~ well stared 1n M!Y 2018 ___ _
J.4]_1W4-2 converted to a chloroform_pumpi~ 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.
DUSA White Mesa Mill
Parameter
lGWQSl
Chloromethane Methylene Chloride Chloride
130 ua/Ll l5ua/U No GWQS lma/Ll
NA NA NA
NA NA NA
<10 <10 NA
<50 <50 54
<50 <50 51
<50 <50 48
<50 <50 50
<1.0 <1.0 49
<1.0 <1.0 49
<1.0 <1.0 47
<1.0 <1.0 45
<1.0 <1.0 47
<1.0 <1.0 43
<1.0 <1.0 42
<1.0 <1.0 39
NA NA 44
<2.0 <2.0 NA
<1.0 <1.0 37
<1.0 <1.0 34
<1.0 <1.0 39
<1.0 <1.0 41
<1.0 1--------------------48 <1.0
<1.0 <1.0 35
<1.0 <1.0 36
<1.0 <1.0 38
<1.0 <1.0 41
<1.0 <1.0 35
<1.0 <1.0 40
<1.0 <1.0 39
<1.0 <1.0 38 ;---------<1.0 1-----------<1.0 1-----------43
<1.0 <1.0 39
<1.0 <1.0 38
<1.0 <1.0 39
<1.0 <1.0 39.6
<1.0 <1.0 38.8
<1.0 <1.0 43.9
<1 .0 <1.0 37.4
<1.0 <1.0 47.5
7.1 <1.0 40
<1.0 <1.0 40
<1.0 1-----------<1.0 1-----------37.6
<1.0 <1.0 41 .3
1.72 <1.0 45.8
<1.0 <1.0 38.5
<1.0 <1.0 39.7
<1.0 <1.0 41.9
<1.0 <1.0 40.2
<1.0 <1.0 40.3
<1.0 <1.0 41.7
<1 .0 <1.0 40.7
<1.0 <1.0 40.5
<1.0 <1.0 40.7
<1.0 ~--------<1.0 1-----------.,. ________ 42.2
<1.0 <1.0 39.0
<1.0 <1.0 44.6
<1.0 <1.0 41.4
<1.0 <1.0 38.3
<1.0 <1.0 38.5
<1.0 <1.0 39.4
<1.0 <1.0 40.4
<1.0 <1.0 43.4
<1.0 <1.0 46.1
<1.0 <1.0 40.0
<1.0 <1.0 38.6
<1.0 <1.0 39.8
<1.0 <1.0 39.4
<1.0 <1.0 39.6
<1.0 <1.0 42.5
<1.0 <1.0 37.1
Nitrate, Nitrate+ Nitrite
110 ma/Ll
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
7.6
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
7.02
7.7
6.33
6.45
6.27
6.7
6.56
7.22
6.77
6.87
7.06
6.47
6.90
6.12
6.34
6.10
602
7.26
10.40
6.32
6.52
4.58
7.26
7.04
6.77
6.75
902
4.00
7.32
6.6
TABLE 1 (8 of 33)
Historic Summary Of Monitoring Well Analytical Results Up To The 1st Quarter 2022
Chloroform Contamination Investigation
TW4-5
Sampling Event
Carbon Tetrachloride
15 ua/Ll
Chloroform
170 ua/Ll
DUSA White Mesa Mill
Chloromethane
130 ua/Ll
Parameter
IGWQSl
Methylene Chloride
15 ua/Ll
1st Qtr 3/16/2005 NA 120 NA NA
2nd Qtr 5/25/2005 NA 113 NA NA
3rd Qtr 8/31/2005 <2.5 82 5.8 <2.5
Chloride
No GWQS lma/Ll
NA
NA
NA
4th Qtr 121712005 <2.5 63 2.5 <2.5 56
1st Qtr 3/9/2006 <2.5 66 3.1 <2.5 52
2nd Qtr 6/14/2006 <2.5 51 3.1 <2.5 51
3rd Qtr 7/20/2006 <1.0 53.7 <1.0 <1.0 54
4th Qtr 11/8/2006 <1.0 47.1 <1.0 <1.0 55
1st Qtr 2/28/2007 <1.0 35 <1.0 <1.0 57
2nd Qtr 6/27/2007 <1.0 26 <1.0 <1.0 45
3rd Qtr 8/15/2007 <1.0 9.2 <1.0 <1.0 38
4th Qtr 10/10/2007 <1.0 9.4 <1.0 <1.0 39
1st Qtr 3/28/2008 <1.0 11 <1.0 <1.0 36
2nd Qtr 6/25/2008 <1.0 9.3 <1.0 <1.0 37
3rdQtr 9/10/2008 <1.0 11 <1.0 <1.0 34
4th Qtr 10/15/2008 <1.0 10 <1.0 <1.0 37
1st Qtr 3/4/2009 <1.0 12 <1.0 <1.0 34
2nd Qtr 6/23/2009 <1.0 13 <1.0 <1.0 37
3rd Qtr 9/14/2009 <1.0 12 <1.0 <1.0 48
4th Qtr 12/29/2009 <1.0 8.5 <1.0 <1.0 41
1st Qtr 2/25/2010 <1.0 13 <1.0 <1.0 43
2nd Qtr 6/14/2010 <1.0 12 <1.0 <1.0 28
3rd Qtr 8/11/2010 <1.0 12 <1.0 <1.0 38
4thQtr 10/15/2010 <1.0 11 <1.0 <1.0 41
1stQtr 2/22/2011 <1.0 10 <1.0 <1.0 34
2nd Qtr 5/26/2011 <1.0 9 <1.0 <1.0 35
3rd Qtr 8171201 1 <1.0 10 <1.0 <1.0 37
4th Qtr 11/16/2011 NA #N/A NA NA 30
Nitrate, Nitrate + Nitrite
110 mo/LI
4.9
3.7
6.0
6.0
6.0
5.9
6.7
2.9
7.8
7.0
7.7
8.2
7.4
8.7
7.9
9.3
7.9
7.5
8.3
7.5
6.8
7.1
7.0
7.2
7.0
7.2
7.5
6.0
(11 121712011 <1.0 7.9 <1.0 <1.0 NA #N/A lsf0tF(2) 1/18/2012 <1.0 7.6 <1.0 <1.0 22 2ndQtr 6/6/2012 <1.0 -:-----8.4 <1.0 ~f() ________ .,_ _________ 39
3rdQtr 9/11/2012<1.0 12.0<1.0 <1.0 37
4th Qtr 10/4/2012 <1.0 8.0 <1.0 <1.0 38
1stQtr 2/13/2013 <1.0 10.8 <1.0 <1.0 34.3
2nd Qtr 6/13/2013 <1.0 11.2 <1.0 <1.0 36.5
3rdQtr 9/5/2013 <1.0 11.6 <1.0 <1.0 39.1
4thQtr 11/13/2013 <1.0 14.4 <1.0 <1.0 41.1
1stQtr 1/30/2014 <1.0 12.5 <1.0 <1.0 40.5
2nd Qtr 5/22/2014 <1.0 13.4 <1.0 <1.0 51.4
3rd Qtr 8/14/2014 <1.0 12.0 <1.0 <1.0 44
4th Qtr 10/13/2014 <1.0 14.6 <1.0 <1.0 45.1
1stQtr 3/12/2015 <1.0 13.8 <1.0 <1.0 45.1
OuplicateTW4-70 <1.0 13.8 <1.0 <1.0 46.4
2nd Qtr 6/10/2015 <1.0 13.3 1.07 <1.0 47.3
3rdQtr 9/10/2015 <1.0 12.9 <1.0 <1.0 52.2
4thQtr 10/28/2015<1.0 11.0<1.0 <1.0 43.6
1stQtr 3/17/2016 <1.0 11.0 <1.0 <1.0 44.7
2nd Qtr 5/23/2016 <1.0 13.6 <1.0 <1.0 45.9
3rd Qtr 8/3/2016 <1.0 10.8 <1.0 <1.0 44.6
4th Qtr(3) 10/26/2016 <1.0 9.9 <1.0 <1.0 47.8
D!!£>licate1W4-75 _____ <1.0 ---------'----12.0 <1.0 ______ .,:=1.0 ________ .._ ________ 49.5
1st Qtr 3/15/2017 <1.0 12.6 <1.0 <1.0 44.7
2nd Qtr 6/15/2017 <1.0 14.6 <1.0 <1.0 47.3
3rd Qtr 8/8/2017 <1.0 14.6 <1.0 <1.0 48.6
4th Qtr 10/11/2017 <1.0 13.8 <1.0 <1.0 42.5
DWMRCs litsamcle <0.19 12 <0.3 <0.32 47
1stQtr 3/12/2018 <1.0 15.2 <1.0 <1.0 51.2
2nd Qtr 6/13/2018 <1.0 13.9 <1.0 <1.0 47.3
3rd Qtr 8/30/2018 <1.0 15.4 <1.0 <1.0 54.7
Duplicate1W4-70 <1.0 15.3 <1.0 <1.0 55.9
14th Qtr 11/28/2018 <1.0 15.6 <1.0 <1.0 49.8
lnunllcat, 1W4-70 <1.0 16.2 <1.0 <1.0 48.5
1stQtr 3/16/2019 <1.0 14.1 <1.0 <1.0 47.6
12nd Qtr 6/13/2019 <1.0 15.8 <1.0 <1.0 49.3
l3rdQtr 9/11/2019 <1.0 14.6 <1.0 <1.0 46.1
1Duplicate1W4-70 <1 .0 13.6 <1.0 <1.0 45.8
14th Qtr 12/14/2019 <1.0 15.7 <1.0 <1.0 53.1
IDunlicate 1W4-70 <1.0 16.0 <1.0 <1.0 52.5
fatQtr 3/17/2020 <1.0 14.8 <1.0 <1.0 48.3
1Duplicate1W4-70 <1.0 14.8 <1.0 <1.0 48.4
2nd Qtr 6/11/2020 <1.0 15.4 <1 .0 <1.0 49.5
3rd Qtr 9/18/2020 <1 .0 14.8 <1.0 <1.0 47.0
4thQtr 11/4/2020<1.0 15.6<1.0 <1.0 50.2
1stQtr 3/18/2021 <1.0 12.9 <1.0 <1.0 46
2nd Qtr 6/16/2021 <1.0 13.0 <1.0 <1.0 50.8
3rd Qtr 9/22/2021 <1 .0 11.2 <1.0 <1.0 39.8
th tr 12/8/2021 <1.0 12.4 <1 .0 <1.0 51.3
3/23/2022 <1.0 11.0 <1.0 <1.0 47.7
were resampled because laboratory '!'issed holding time.
(2) As of March 2012 both north and south wild hf~5;nds no lo!!9er receIvIn!Lwater JJl chloroform f=l~jng ,!"ell TW-4-39 started in 11120/16 __ _
NA and #N/A(for graphs) = not analyzed
Shaded indicates concentrations exceeding GWQS.
5.8
8.0
8.1
7.7
8.24
10.70
7.79
7.75
9.16
7.78
7.2
8.31
9.32
8.81
7.08
8.1
8.03
10.2
8.98
8.49
8.32
8.34
8.49
8.52
8.52
8.57
8.6
8.36
9.24
7.34
7.28
7.67
7.80
7.38
7.62
7.04
6.89
6.97
7.29
7.10
7.72
7.83
6.37
6.19
7.43
8.11
6.63
6.71
7.3
TABLE 1 (9 of 33)
Historic Summary Of Monitoring Well Analytical Results Up To The 1st Quarter 2022
Chloroform Contamination Investigation
DUSA White Mesa Mill
TW4-6
Sampling Event
Carbon Tetrachloride Chloroform Chloromethane
{5 UQ/Ll {70 UQ/Ll {30 UQ/Ll
1stQtr 3/16/2005 NA <1 .0 NA
2nd Qtr 5/25/2005 NA 2.5 NA
3rdQtr 8/31/2005 <1.0 10 2.8
4th Qtr 12/7/2005 <1.0 17 1.3
1stQtr 3/9/2006 <1.0 31 <1.0
2nd Qtr 6/14/2006 <1.0 19 <1.0
3rdQtr 7/20/2006 <1.0 11 <1.0
4th Qtr 11/8/2006 <1.0 42.8 <1.0
1stQtr 2/28/2007 <1.0 46 <1.0
2nd Qtr 6/27/2007 <1.0 11 <1.0
3rdQtr 8/15/2007 <1.0 18 <1.0
4th Qtr 10/10/2007 <1.0 18 <1.0
1stQtr 3/28/2008 <1.0 52 <1.0
2ndQtr 6/25/2008 <1.0 24 <1.0
3rd Qtr 9/10/2008 <1.0 39 <1.0
4thQtr 10/15/2008 <1.0 37 <1.0
1stQtr 3/4/2009 <1.0 81 <1.0
2ndQtr 6/23/2009 <1.0 120 <1.0 .... 3rd Qtr 9/14/2009 <1.0 280 <1.0
4th Qtr 12/29/2009 <1.0 250 :-------<1.0 ------1st Qtr (5) 2/25/2010 <1.0 1000 <1.0
2ndQtr 6/14/2010 <1.0 590 <1.0
3rd Qtr 8/11/2010 <1.0 630 <1.0
4thQtr 10/15/2010 <1.0 420 <1.0
1stQtr 2/22/2011 <1.0 47 <1.0
2ndQtr 5/26/2011 <1.0 9.6 <1.0
3rd Qtr 817/2011 <1.0 16 <1.0
4thQtr 11/16/2011 NA #N/A NA
(1) 12/7/2011 <1.0 21 <1.0
,,rotrUi1 1 ;;;~~~;~ <1.0 50 <1.0
<1.0 38 <1.0 :-------2nd Qtr 6/6/2012 <1.0 4.7 <1.0
3rd Qtr 9/11/2012 <1.0 6.9 <1.0
4thQtr 10/4/2012 <1.0 9 <1.0
1s1Qtr 2/13/2013 <1.0 6.89 <1.0
2nd Qtr 6/13/2013 <1.0 4.86 <1.0
3rd Qtr 9/5/2013 <1.0 5.93 <1.0
4lhQtr 11/13/2013 <1.0 5.51 <1.0
1stQtr 1/29/2014 <1.0 5.7 <1.0
2ndQtr 5/22/2014 <1.0 10.3 <1.0
3rd Qtr 8/14/2014 <1.0 202 <1.0
(3) 9/24/2014 <1.0 260 <1.0
4thQtr 10/29/2014 <1.0 723 <1.0
1s1Qtr 3/12/2015 <1.0 1,180 <1.0
2ndQtr 6/10/2015 <1.0 1,040 <1.0
3rd Qtr 9/10/2015 <1.0 1,040 <1.0
4thQtr 10/29/2015 <1.0 843 <1.0
1s1Qtr 3/22/2016 <1.0 834 <1.0
2ndQtr 6/8/2016 <1.0 486 <1.0
3rd Qtr 7/27/2016 <1.0 433 <1.0
4thQtr 10/26/2016 <1.0 301 <1.0
1s1Qtr 3/16/2017 <1.0 288 <1.0
2ndQtr 6/21/2017 <1.0 239 <1.0
3rd Qtr 8/8/2017 <1.0 129 <1.0
4thQtr 10/11/2017 <1.0 121 <1.0
1st Qtr 3/20/2018 <1.0 159 <1.0
2nd Qtr (6) 6/14/2018 <1.0 -----749 <1.0
3rd Qtr 9/5/2018 <1.0 53.2 <1.0
4lhQtr 12/12/2018 <1.0 37.0 <1.0
1stQtr 3/19/2019 <1.0 23.2 <1.0
2ndQtr 6/13/2019 <1.0 15.8 <1.0
3rd Qtr 9/11/2019 <1.0 15.8 <1.0
4thQtr 12/14/2019 <1.0 7.4 <1.0
1stQtr 3/17/2020 <1.0 6.93 <1.0
2ndQtr 6/11/2020 <1.0 4.9 <1.0
3rd Qtr 9/18/2020 <1.0 3.6 <1.0
4thQtr 11/4/2020 <1.0 4.61 <1.0
1stQtr 3/18/2021 <1.0 3.78 <1.0
2ndQtr 6/16/2021 <1.0 2.9 <1.0
3rd Qtr 9/15/2021 <1.0 3.71 <1.0
4thQtr 12/8/2021 <1.0 3.92 <1.0
1s1Qtr 3/22/2022 <1.0 3.10 <1.0
(1) VOCs were resampled because laboratory massed holding time.
(2) Results of the TW4-70 the duplicate sample for TW4-6.
(3) Reanalyzed for voes only.
(4) As of March 2012 both north and south wild lit;_P;mds no lo~er receivinQ._water
J.51,Chloroform.e,umpina.,weU TW4-4 stared in 1st_s!rJ010 __
J.61 Chloroform .e,umpin2,_ well TW4-41 installed M~ 2018 __ _
NA and #N/A(for graphs)"' not analyzed
Shaded indicates concentrations exceeding GWOS.
Parameter
{GWQSl
Methylene Chloride
{5 UQ/Ll
NA
NA
<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-----------<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
NA
<1.0
<1.0
<1.0 1-----------<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
<1.0
<1.0
<1.0
Chloride
No GWQS {mq/Ll
NA
NA
NA
32
31
30
37
65
32
38
36
35
33
35
35
33
35
37
37
41 1----------45
33
31
41
40
42
39
36
NA
33
38 1-----------40
21
41
40.4
37.9
40.6
40.2
40.6
37
40
NA
41.1
41.2
41.6
47
40.2
42.3
44.1
42.2
46.1
42.1
42.6
42.9
37.6
43.1 ~ 40.2
44
20.0
41
38.1
39.7
45.7
43.2
42.4
40.5
42.9
41.6
43.8
34.1
44.8
31.5
Nitrate, Nitrate+ Nitrite
{10 mq/Ll
0.2
0.4
0.8
0.9
1.2
1.0
0.6
1.4
1.8
0.6
0.7
0.8
1.1
0.9
1.1
1.0
2.2
2.7
5.0
6.1
1.8
2.5
3.9
4.3
0.7
0.3
0.3
0.8
#N/A
0.8
0.7
0.2
0.1
0.2
0.2
0.2
0.2
1.5
0.2
0.3
4.2
#N/A
6.9
5.3
5.9
6.8
5.6
6.79
3.19
3.85
3.74
3.15
2.42
1.71
1.71
1.96
1.48
1.18
0.90
0.755
0.484
0.412
0.244
0.222
0.205
0.144
0.197
0.205
0.215
0.166
<0.100
0.1
TABLE 1 (10 of 33)
Historic Summary Of Monitoring Well Analytical Results Up To The 1st Quarter 2022
Chloroform Contamination Investigation
TW4-7
Sampling Event
Carbon Tetrachloride Chloroform
(5 ua/Ll 170 ua/Ll
1stQtr 3/16/2005 NA 3,100
2ndQtr 5/25/2005 NA 2,700
3rd Qtr 8/31/2005 <10 3,100
4thQtr 12/7/2005 <SO 2,500
1stQtr 3/9/2006 <SO 1,900
2ndQtr 6/14/2006 <SO 2,200
3rd Qtr 7/20/2006 <SO 2,140
4thQtr 11/8/2006 1.5 2160
1stQtr 2/28/2007 1.1 1,830
2nd Qtr 6/27/2007 1.5 2,600
3rd Qtr 8/15/2007 1.4 2,300
4thQtr 10/10/2007 1.2 1 900
1stQtr 3/28/2008 1.3 2,200
2nd Qtr 6/25/2008 1.3 1,800
3rd Qtr 9/10/2008 1.4 1.,600
4thQtr 10/15/2008 NA #N/A
11/18/2008 <2.0 2 500
1stQtr 3/11/2009 1.2 1,800
2nd Qtr 6/23/2009 <1.0 1,400
3rd Qtr 9/14/2009 1 1,500
4thQtr 12/29/2009 <1.0 1 300
1stQtr 2/25/2010 <1.0 1,200
2nd Qtr 6/14/2010 <1 .0 1,100
3rd Qtr 8/11/2010 1 1,500
4thQtr 10/15/2010 <1.0 1100
1stQtr 2/23/2011 <1.0 1,300
2ndQtr 6/1/2011 <1.0 1,200
3rd Qtr 8/18/2011 <1.0 1,200
4thQtr 11/29/2011 <1.0 1 000
Tsfi'.ifr(1') 1/19/2012 <1.0 ~---1,Q.O.Q, 1------------2nd Qtr 6/14/2012 <1.0 790
3rd Qtr 9/13/2012 <1.0 870
4thQtr 10/4/2012 <1.0 940
1stQtr 2/13/2013 <1.0 940
2ndQtr 6/18/2013 <1.0 953
3rd Qtr 9/12/2013 <1.0 1,040
4thQtr 11/14/2013 <1.0 1 050
1stQtr 2/5/2014 5.41 946
2ndQtr 5/22/2014 4.78 847
3rd Qtr 8/2712014 <1.0 857
4th Qtr 10/30/2014 <1.0 926
1st Qtr (2) 3/18/2015 <1.0 -----942
2ndQtr 6/11/2015 <1.0 950
3rd Qtr 9/10/2015 <1.0 897
4thQtr 10/29/2015 <1.0 847
1stQtr 3/22/2016 <1.0 834
2ndQtr 6/8/2016 <1.0 909
3rd Qtr 8/4/2016 <1.0 1,000
4thQtr 10/26/2016 <1.0 886
1stQtr 3/21/2017 <1.0 986
2ndQtr 6/21/2017 <1 .0 968
3rd Qtr 8/4/2017 <1.0 1,070
4thQtr 10/11/2017 <1 .0 884
DWMRC split sam1Jle <7.6 890
1stQtr 3/21/2018 <1 .0 721
2ndQtr 6/14/2018 <1.0 751
3rd Qtr 9/6/2018 <1.0 781
4thQtr 12/13/2018 <1.0 838
1stQtr 3/20/2019 <1.0 736
2ndQtr 6/19/2019 <1.0 862
3rd Qtr 9/12/2019 <1.0 801
4th Qtr 12/18/2019 <1.0 546
1stQtr 3/18/2020 <1.0 746
2nd Qtr 6/12/2020 <1.0 864
Oeplicate TW4-75 <1.0 871
3rdQtr 9/19/2020 <1.0 971
4th Qtr 11/11/2020 <1.0 967
OWMRC split sample <10 930
1stQtr 3/24/2021 <1.0 875
2nd Qtr 6/17/2021 <1.0 819
3rdQtr 9/23/2021 <1.0 801
4th Qtr 12/9/2021 <1.0 868
1stQtr 3/24/2022 <1.0 776
J.1) As of March 2012 both north and south Wild life ponds no lo~er receIvIn!Lwater
(2) chloroform ~TP}n~weUs TW4-1 and TW4-2 started in 1 /14/15 _____ _
NA and #N/A(for graphs)= not analyzed
Shaded indicates concentrations exceeding GWOS.
Bold and italics indicates the MDL exceeded the GWOS.
J = Approximated value
DUSA White Mesa Mill
Parameter
(GWQS)
Chloromethane Methylene Chloride Chloride
130 ua/Ll 15 ua/Ll No GWQS (mg/Ll
NA NA NA
NA NA NA
<10 <10 NA
<SO <SO 52
<SO <SO 48
<SO <SO 47
<50 <SO 51
<1.0 <1.0 49
<1.0 <1.0 47
<1.0 <1.0 45
<1.0 <1.0 44
<1.0 <1.0 45
<1.0 <1.0 43
<1.0 <1.0 43
<1.0 <1.0 35
NA NA 40
<2.0 <2.0 NA
<1.0 <1.0 35
<1.0 <1.0 37
<1.0 <1.0 37
<1.0 <1.0 37
<1.0 <1.0 35
<1.0 <1.0 31
<1.0 <1.0 36
<1.0 <1.0 38
<1.0 <1.0 45
<1.0 <1.0 35
<1.0 <1.0 37
<1.0 <1.0 37
<1.0 <1.0 37
<1.0 <1.0 ---------41
<1.0 <1.0 40
<1.0 <1.0 41
<1.0 <1.0 37.7
<1.0 <1.0 39.3
<1.0 <1.0 36.4
<1.0 <1.0 37.2
<1.0 <1.0 38.2
<1.0 <1.0 37.7
1.5 <1.0 39
<1.0 <1.0 --------., -------40.2 <1.0 <1.0 40.4
<1.0 <1.0 42.1
<1.0 <1.0 46.7
<1.0 <1.0 40.6
<1.0 <1.0 42.4
<1.0 <1.0 44.1
<1.0 <1.0 42.3
<1.0 <1.0 45.8
<1.0 <1.0 40.5
<1.0 <1.0 43.3
<1.0 <1.0 44.7
<1.0 <1.0 43.7
<12 17 J 42.0
<1.0 <1.0 44.5
<1.0 <1.0 41.5
<1.0 <1.0 48.5
<1.0 <1.0 42.8
<1.0 <1.0 41.3
<1.0 <1.0 43.0
<1.0 <1 .0 39.6
<1.0 <1 .0 47.2
<1.0 <1 .0 42.1
<1.0 <1.0 44.1
<1.0 <1.0 43.1
<1.0 <1 .0 41.5
<1.0 <1.0 42.8
<20 <20 43
<1.0 <1.0 46.2
<1.0 <1.0 41.7
<1.0 <1.0 42.8
<1.0 <1.0 42.9
2.1 <1.0 41.3
Nitrate, Nitrate+ Nitrite
(10ma/Ll
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
3.9
4.0
3.8
3.8
3.51
4
4.17
4.13
4.24
4.19
2.9
3.68
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
406
4.19
3.87
4.40
3.90
4.25
4.80
4.58
3.02
4.1
TABLE 1 (11 of 33)
Historic Summary Of Monitoring Well Analytical Results Up To The 1st Quarter 2022
Chloroform Contamination Investigation
DUSA White Mesa Mill
TW4-8
Sampling Event
Carbon Tetrachloride Chloroform Chloromethane
{5 UQ/L) {70 UQ/L) {30 UQ/L)
1stQtr 3/16/2005 NA 10 NA
2nd Otr 5/25/2005 NA <1.0 NA
3rd Qtr 8/31/2005 <1.0 1.1 1.7
4thQtr 12/7/2005 <1.0 <1.0 <1.0
1stQtr 3/9/2006 <1.0 1.3 2 1
2ndOtr 6/14/2006 <1.0 1.8 1.0
3rdOtr 7/20/2006 <1.0 <1.0 <1.0
4thQtr 11/8/2006 <1.0 <1.0 <1.0
1stOtr 2/28/2007 <1.0 2.5 <1.0
2nd Qtr 6/27/2007 <1.0 2.5 <1.0
3rdOtr 8/15/2007 <1.0 1.5 <1.0
4thQtr 10/10/2007 <1.0 3.5 <1.0
1stQtr 3/28/2008 <1.0 <1.0 <1.0
2nd Otr 6/25/2008 <1.0 <1.0 <1.0
3rdQtr 9/10/2008 <1.0 <1.0 <1.0
4th Qtr 10/15/2008 <1.0 <1.0 <1.0
1stQtr 3/4/2009 <1.0 <1.0 <1.0
2nd Otr 6/23/2009 <1.0 <1.0 <1.0
3rdQtr 9/14/2009 <1.0 <1.0 <1.0
4th Otr 12/17/2009 <1.0 <1.0 <1.0
1stQtr 2/24/2010 <1.0 <1.0 <1.0
2nd Otr 6/14/2010 <1.0 <1.0 <1.0
3rdOtr 8/18/2010 <1.0 <1 .0 <1.0
4th Qtr 10/15/2010 <1.0 <1.0 <1.0
1stOtr 2/16/2011 <1.0 <1.0 <1.0
2nd Qtr 5/25/2011 <1.0 <1.0 <1.0
3rdQtr 8/16/2011 <1.0 <1.0 <1.0
4th Qtr 11/16/2011
lsfQfr(~,i i71~~~ii
<1.0 <1.0 <1.0
<1.0 <1.0 <1.0
2nd Qtr 5/13/2012 <1.0 <1.0 <1.0
3rd Otr 8/29/2012 <1.0 <1 .0 <1.0
4th Qtr 10/3/2012 <1.0 <1.0 <1.0
1stQtr 2{7/2013 <1.0 <1.0 <1.0
2nd Qtr 5/30/2013 <1.0 <1.0 <1.0
3rd Qtr 9/5/2013 <1.0 <1 .0 <1.0
4th Qtr 11{7/2013 <1.0 <1.0 <1.0
1stOtr 1/23/2014 <1.0 63.8 <1.0
(2) 2/6/2014 <1.0 100 <1.0
2nd Qtr 5/22/2014 <1.0 122 <1.0
3rdQtr 8/27/2014 <1.0 107 <1.0
4th Qtr 10/29/2014 <1.0 191 <1.0
1stOtr(4) 3/12/2015 <1.0 :-------961 :---------<1.0
2nd Otr 6/11/2015 <1.0 981 <1.0
3rdQtr 9/10/2015 <1.0 747 <1.0
4th Qtr 10/29/2015 <1.0 770 <1.0
1s1Qtr 3/17/2016 <1.0 634 <1.0
2nd Otr 6/8/2016 <1.0 595 <1.0
3rd Qtr 8/4/2016 <1.0 522 <1.0
4th Qtr 10/27/2016 <1.0 472 <1.0
1stOtr 3/21/2017 <1.0 359 <1.0
2nd Qtr 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
Oeplicate TW4-75 <1.0 194
DWMRC split sami::le <1.9 230
1st Qtr 3/21/2018 <1.0 220 <1.0
Deplicate TW4-75 <1.0 171 <1.0
2nd Qtr 6/14/2018 <1.0 155 <1.0
3rdQtr 9/5/2018 <1.0 137 <1.0
4th Otr 12/13/2018 <1.0 93.8 <1.0
1stOtr 3/19/2019 <1.0 103 <1.0
2nd Qtr 6/19/2019 <1.0 96 <1.0
3rd Otr 9/12/2019 <1.0 75.4
Deplicate TW4-75 <1.0 75.6
4th Qtr 12/18/2019 <1.0 84.4
1stOtr 3/18/2020 <1.0 55.0
2nd Otr 6/12/2020 <1.0 53.8
3rdQtr 9/18/2020 <1.0 39.5
4th Otr 11/11/2020 <1.0 51.3
Deplicate lW4-70 <1.0 52.9
OWMRC solit sam le <10 50.0
1stOtr 3/18/2021 <1.0 26.9
2nd Qtr 6/16/2021 <1.0 22.3
3rdQtr 9/22/2021 <1.0 17.0
Oeplicate lW4-70 <1.0 16.4
4th Otr 12/8/2021 <1.0 17.2
1stQtr 3/23/2022 <1.0 15.1
(1) VOCs were resampled because laboratory missed holding time.
(2) Resampled to verify chloroform concentration that was collected on 1'23/14.
J.3) As of March 2012 both north and south wild life ponds no lo!!iJer recelVln!Lwater
J.4lchloroform ~mpinQ,!"ells TW4-1 and TW4-2 started in 1/14/15 _____ _
NA and #N/A(for graphs)= not analyzed
Shaded indicates concentrations exceeding GWQS.
J "' Approximated value
<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
H "' Sample was analyzed beyond holding times and may not be accureate concentration.
112
4.7 J
Parameter
{GWQS)
Methylene Chloride
{5 UQ/L)
NA
NA
NA
<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
<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
Chloride Nitrate, Nitrate+ Nitrite
No GWQS {mq/Ll {10mQ/Ll
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 i...---------0.3 1------------44 0.2
48 0.1
47 <0.1
46.6 0.41
45.5 <0.1
47.5 0.1
46.1 <0.1
48.5 0.166
46.5 0.166
53 0.538
47 0.6
46.7 0.91 4 1----------49.6 2.3
53 1.88
59.6 1.96
52 2.2
54.2 2.48
58.7 2.1 4
56.9 2.1 0
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
TABLE 1 (12 of 33)
Historic Summary Of Monitoring Well Analytical Results Up To The 1st Quarter 2022
Chloroform Contamination Investigation
DUSA White Mesa Mill
TW4-9
Sampling Event
Carbon Tetrachloride Chloroform Chloromethane
/5 ua/Ll /70 ua/Ll
1stQtr 3/16/2005 NA 3.8 NA
2nd Qtr 5/25/2005 NA 1.2 NA
3rdQtr 8/31/2005 <1.0 <1 .0
4th Qtr 1217/2005 <1.0 <1.0 <1.0
1stQtr 3/9/2006 <1.0 <1.0
2nd Qtr 6/14/2006 <1.0 19
3rd Qtr 7/20/2006 <1.0 <1.0 <1.0
4thQtr 11/8/2006 <1 .0 <1.0 <1.0
1stQtr 2/28/2007 <1.0 <1.0 <1.0
2ndQtr 6/27/2007 <1.0 21 <1.0
3rd Qtr 8/15/2007 <1.0 9.5 <1.0
4thQtr 10/10/2007 <1.0 8.7 <1.0
1stQtr 3/28/2008 <1.0 1.3 <1.0
2ndQtr 6/25/2008 <1.0 1 <1.0
3rd Qtr 9/10/2008 <1.0 <1.0 <1.0
4th Qtr 10/15/2008 <1 .0 <1.0 <1.0
1stQtr 3/4/2009 <1.0 <1.0 <1.0
2nd Qtr 6/23/2009 <1.0 <1.0 <1.0
3rdQtr 9/14/2009 <1.0 <1.0 <1.0
4th Qtr 12/17/2009 <1.0 <1.0 <1.0
1stQtr 2/23/2010 <1.0 <1.0 <1.0
2nd Qtr 6/14/2010 <1.0 <1.0 <1.0
3rdQtr 8/13/2010 <1.0 <1.0 <1.0
4th Qtr 10/15/2010 <1.0 <1.0 <1.0
1stQtr 2/17/2011 <1 .0 <1.0 <1.0
2nd Qtr 5/25/2011 <1.0 <1.0 <1.0
3rdQtr 8/16/2011 <1.0 <1.0 <1.0
4th Qtr 11/16/2011 NA NA NA
(1) 1217/2011 <1.0 <1.0 <1.0
~"';:'~~I ·-1/18/2012 <1.0 <1.0 <1.0 1-------------------nd Qtr 5/31/2012 <1.0 <1.0 <1.0
3rdQtr 8/30/2012 <1.0 <1.0 <1.0
4th Qtr 10/3/2012 <1.0 <1.0 <1.0
1stQtr 217/2013 <1.0 <1.0 <1.0
2nd Qtr 5/30/2013 <1.0 <1.0 <1.0
3rd Qtr 9/5/2013 <1 .0 <1.0 <1.0
4th Qtr 11/7/2013 <1.0 <1.0 <1.0
1stQtr 1/29/2014 <1.0 <1.0 <1.0
2nd Qtr 5/22/2014 <1 .0 6.9 <1.0
3rd Qtr 8/14/2014 <1.0 47 <1.0
4thQtr 10/29/2014 <1.0 101 <1.0
1stQtr 3/12/2015 <1.0 53.5 <1.0
2ndQtr 6/11/2015 <1 .0 35.1 <1.0
3rd Qtr 9/3/2015 <1 .0 48 <1.0
4thQtr 10/28/2015 <1 .0 68.4 <1.0
1stQtr 3/17/2016 <1.0 74.3 <1 .0
2ndQtr 6/8/2016 <1 .0 76.2 <1 .0
3rd Qtr 8/3/2016 <1 .0 76.8 <1.0
dlhQtr 10/26/2016 <1.0 76.0 <1 .0
stQtr 3/17/2017 <1.0 113 <1.0
2ndQtr 6/21/2017 <1.0 113 <1 .0
3rd Qtr 8/3/2017 <1.0 118 <1.0
4thQtr 10/11/2017 <1 .0 132 <1.0
DWMRC split sample <0.98 120 <1.5
1stQtr 3/21/2018 <1.0 159 <1.0
2nd Qtr 6/4/2018 <1.0 134 <1.0
Deplicate TW4-75 <1.0 132 <1.0
3rdQtr 9/5/2018 <1.0 94.2 <1.0
Oeplicate TW4-75 <1.0 92.4 <1.0
4th Qtr 12/13/2018 <1.0 109 <1.0
1stQtr 3/19/2019 <1.0 86.4 <1.0
2nd Qtr 6/19/2019 <1.0 68.1 <1.0
3rdQtr 9/11/2019 <1.0 66.0 <1.0
4th Qtr 12/18/2019 <1.0 54.8 <1.0
1stQtr 3/18/2020 <1.0 48.9 <1.0
2nd Qtr 6/12/2020 <1.0 55.1 <1.0
Deplicate TW4-70 <1.0 56.4 <1.0
3rd Qtr 9/18/2020 <1.0 45.0 <1.0
4th Qtr 11/11/2020 <1.0 47.1 <1.0
OWMRC split sample <10 48.0 <20
OWMRC Oup sample (TW4-81) <10 46.0 <20
1stQtr 3/18/2021 <1 .0 39.0 <1.0
Deplicate TW4-70 <1.0 38.2 <1.0
2nd Qtr 6/16/2021 <1 .0 102 <1.0
3rdQtr 9/22/2021 <1 .0 30.0 <1.0
12/8/2021 <1.0 25.4 <1.0
1i'r5 <1 .0
(1 atory missed holding time.
(2) As of March 2012 both north and south wild life ponds no lo!lJer rece1v1nq_water.
NA and #N/A(for graphs)= not analyzed
Shaded indicates concentrations exceeding GWOS.
J = Approximate value
130 ua/Ll
2.9
2.6
2.7
Parameter
tGWQSl
Methylene Chloride
/5 ua/Ll
NA
NA
<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
NA
<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
1.6 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
<20
<20
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
Chloride
No GWQS lma/Ll
NA
NA
NA
42
38
39
41
44
44
42
38
40
35
35
28
58
30
30
30
37
47
33
40
34
41
38
21
38
NA
28 --------23
22
21
20.6
21.4
22.7
23.6
22
24
27
25
29.5
35.3
39.3
29.2
33.6
35.1
33.6
37.4
34.5
35.9
37
32
35
38.3
35.7
35.2
43.4
42.7
36.3
36.9
38.3
35.2
40.1
37.7
39.5
39.6
36.7
37.2
38
38
40.7
38.7
37.4
30.8
36.9
34.6
Nitrate, Nitrate+ Nitrite
110 ma/Ll
1.3
1.3
1.3
1.3
1.5
1.5
0.9
0.7
0.6
1.3
1.8
2
2.1
2.3
2.79
1.99
2.5
2.3
2.5
1.7
1.4
1.5
1.2 u
1.
3.4
4
2.3
#N/A
2.3 ----------.Co
3.9
3.1
4 il 4.4
4.03
4.87
4.36
3.44
2.7
4.29
3.28
1.8
1.4
2.A
2.5
2.11
2.1
2.2
2.1
1.92
1.90
2.18
2.20
1.85
1.85
1.91
1.04
1.11
1.2
1.u
0.78
0.90
0.74
0.85
0.990
1.010
0.867
1.11
0.97
0.97
106
107
2.0
0.700
0.798
""
TABLE 1 (13 of 33)
Historic Summary Of Monitoring Well Analytical Results Up To The 1st Quarter 2022
Chloroform Contamination Investigation
DUSA White Mesa Mill
TW4-10 Parameter
Sampling Event IGWQSl
Carbon Tetrachloride Chloroform Chloromethane Methylene Chloride
15 uq/Ll 170 ua/Ll 130 ua/Ll 15 ua/Ll
1stQtr 3/16/2005 NA 140 NA NA
2nd Qtr 5/25/2005 NA 62 NA NA
3rd Qtr 8/31/2005 <2.5 110 6.2 <2.5
4th Qtr 12(7/2005 <2.5 300 <2.5 <2.5
1stQtr 3/9/2006 <5.0 190 <5.0 <5.0
2nd Qtr 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
2nd Qtr 6/27/2007 <1.0 350 <1.0 <1 .0
3rdQtr 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
2nd Qtr 6/25/2008 <1.0 720 <1.0 <1 .0
3rdQtr 9/10/2008 <1.0 660 <1.0 <1 .0
4th Qtr 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 <1.0 <1 .0
2nd Qtr 6/23/2009 <1.0 1,200 <1.0 <1 .0
3rdQtr 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
2nd Qtr 6/14/2010 <1.0 220 <1.0 <1.0
3rdQtr 8/12/2010 <1.0 100 <1.0 <1.0
4th Qtr 10/15/2010 <1.0 1100 <1.0 <1.0
1stQtr 2/23/2011 <1.0 620 <1.0 <1.0
2nd Qtr 6/14/2011 <1.0 280 <1.0 <1 .0
3rdQtr 8/17/2011 <1.0 180 <1.0 <1.0
4thQtr 11/16/2011 <1.0 110 <1.0 <1.0
TsfQfrfl1 __ 1/19/2012 <1.0 '-----76 <1.0 ------<1.0 -----------1-----------2nd Qtr 6/14/2012 <1.0 79 <1.0 <1 .0
3rdQtr 9/12/2012 <1.0 130 <1.0 <1 .0
4th Qtr 10/3/2012 <1.0 140 <1.0 <1.0
1stQtr 2/13/2013 <1.0 154 <1.0 <1.0
2nd Qtr 6/13/2013 <1.0 486 <1.0 <1.0
3rd Qtr 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
4th Qtr 10/26/2016 <1.0 1 290 <1.0 <1.0
1stQtr 3/21/2017 <1.0 1,260 <1.0 <1.0
2nd Qtr 6/21/2017 <1.0 1,140 <1.0 <1.0
3rdQtr 8/4/2017 <1.0 1,320 <1.0 <1.0
4th Qtr 10/11/2017 <1.0 1,150 <1.0 <1.0
OWMRC solit samole <9.5 1100 <15 16 J
1stQtr 3/21/2018 <1.0 1,240 <1.0 <1.0
2nd Qtr 6/14/2018 <1.0 914 <1.0 <1.0
3rdQtr 9/6/2018 <1.0 911 <1.0 <1.0
4thQtr 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
3rdQtr 9/12/2019 <1.0 734 <1.0 <1.0
4thQtr 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
4thQtr 11/11/2020 <1.0 903 <1.0 <1.0
1s1Qtr 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
4thQtr 12/9/2021 <1.0 675 <1.0 <1.0
1stQtr 3/24/2022 <1.0 471 1 <1.0
Oeplicate TW4-75 <1.0 456 1 <1.0
(11As of March 2012 both north and south wild hf:_J>;mds no lo~er rece1vini_Water.
NA and #N/A(for graphs)= not analyzed
Shaded indicates concentrations exceeding GWQS.
J "'Approximate value
Chloride
No GWQS Ima/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
Nitrate, Nitrate+ Nitrite
110 ma/Ll
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
'-----------0.9 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
135
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
720
7.75
6.35
5.47
5.1
4.9
TABLE 1 (14 of 33)
Historic Summary Of Monitoring Well Analytical Results Up To The 1st Quarter 2022
Chloroform Contamination Investigation
TW4-11 (chloroform pumping well
started1/14/15)
Sampling Event
Carbon Tetrachloride Chloroform
(5 µg/L) (70 µg/L)
1stQtr 3/16/2005 NA 4,400
2nd Qtr 5/25/2005 NA 3,590
3rdQtr 8/31/2005 <10 4,400
4th Qtr 12/7/2005 <100 4,400
1stQtr 3/9/2006 <50 4,400
2nd Qtr 6/14/2006 <50 4,300
3rdQtr 7/20/2006 <50 4,080
4th Qtr 11/8/2006 1.7 3660
1stQtr 2/28/2007 1.3 3,600
2nd Qtr 6/27/2007 1.6 3,800
3rdQtr 8/15/2007 1.7 4,500
4th Qtr 10/10/2007 1.6 4 400
1stQtr 3/28/2008 <1.0 340
2nd Qtr 6/25/2008 <1.0 640
3rd Qtr 9/10/2008 <1.0 900
4thQtr 10/15/2008 NA #N/A
11/18/2008 <2.0 1 ODO
1stQtr 3/11/2009 <1.0 1,000
2ndQtr 6/23/2009 <1.0 980
3rd Qtr 9/14/2009 <1.0 1,000
4thQtr 12/22/2009 <1.0 860
1stQtr 3/3/2010 <1.0 820
2nd Qtr 6/14/2010 <1.0 820
3rd Qtr 8/12/2010 <1.0 800
4thQtr 10/15/2010 <1.0 720
1stQtr 2/23/2011 <1.0 1,000
2nd Qtr 6/1/2011 <1.0 930
3rd Qtr 8/17/2011 <1.0 820
4th Qtr 11/16/2011 <1.0 1500 TsfQtr'ffJ _ 112412012 <1.0 610 :-------2nd Qtr 6/13/2012 <1.0 660
3rdQtr 9/13/2012 <1.0 740
4th Qtr 10/3/2012 <1.0 730
1stQtr 2/13/2013 3.23 867
2nd Qtr 6/18/2013 <1.0 788
3rdQtr 9/12/2013 <1.0 865
4thQtr 11/13/2013 <1.0 874
1stQtr 2/5/2014 5.19 785
2nd Qtr 5/23/2014 <1.0 751
3rdQtr 8127/2014 <1.0 719
4th Qtr 10/29/2014 <1.0 803
1st Qtr(2) 3/9/2015 1.24 ----2,450
2nd Qtr 6/11/2015 <1.0 2,710
3rdQtr 8/31/2015 <1.0 1,120
4th Qtr 10/29/2015 <1.0 2 730
1stQtr 3/9/2016 1.2 2,660
2nd Qtr 5/23/2016 2.19 3,340
3rdQtr 7/25/2016 <1.0 3,200
4th Qtr 10/12/2016 <1.0 3 200
1stQtr 3/8/2017 1.71 3,310
2nd Qtr 6/13/2017 1.83 3,370
3rd Qtr 7/26/2017 1.81 3,290
4th_Qtr ..... 10/11/2017 1.48 2,880
DWMRC sc:lit samole <38 2 900
1stQtr 3/12/2018 1.82 3,090
2ndQtr 6/8/2018 1.34 2,800
3rd Qtr 8/22/2018 1.47 3,050
4thQtr 11/28/2018 1.33 2 930
1stQtr 3/8/2019 1.48 2,820
2ndQtr 6/5/2019 1.52 2,970
3rd Qtr 9/4/2019 1.47 2,790
4thQtr 12/18/2019 <1 .0 3250
1stQtr 2/19/2020 <1.0 2,990
2ndQtr 5/11/2020 1.37 2,810
3rd Qtr 9/4/2020 1.47 3,070
4thQtr 10/28/2020 <1 .0 2670
1stQtr 2/23/2021 <1 .0 2,750
2ndQtr 6/9/2021 <1 .0 3,320
3rd Qtr 8/24/2021 <1.0 2,600
4thQtr 12/1/2021 <1 .0 2 850
1stQtr 3/9/2022° <1 .0 2 780
,i1) As of March 2012 both north and south wild hfe ponds no lo~er receiving water
J21Chloroform.e,umpin2.,wellstarted 1/14/15. ______ _
NA= not analyzed
Bold and italics indicates the MDL exceeded the GWQS.
Bold and italics indicates the MDL exceeded the GWQS.
J = Approximated value
DUSA White Mesa Mill
Parameter
(GWQS)
Chloromethane Methylene Chloride Chloride
(30 µg/L) (5 µg/L) No GWQS (mg/L)
NA NA NA
NA NA NA
<10 <10 NA
<100 <100 58
<50 <50 56
<50 <50 56
<50 <50 55
2.7 1.3 55
<1.0 1.6 54
<1.0 <1.0 53
<1.0 <1.0 53
<1.0 1.2 53
<1.0 <1.0 63
<1.0 <1.0 46
<1 .0 <1.0 42
NA NA 47
<2.0 <2.0 NA
<1.0 <1.0 49
<1.0 <1.0 44
<1.0 <1.0 49
<1.0 <1.0 46
<1.0 <1.0 42
<1.0 <1.0 40
<1.0 <1.0 43
<1.0 <1.0 49
<1.0 <1.0 46
<1.0 <1.0 49
<1.0 <1.0 48
<1.0 <1.0 46
<1.0 <1.0 43
<1.0 1----------<1.0 >---------52
<1.0 <1.0 49
<1.0 <1.0 50
<1.0 <1.0 47.3
<1.0 <1.0 49.3
<1.0 <1.0 46.6
<1.0 <1.0 46.7
<1.0 <1.0 48.5
<1.0 <1.0 51.6
1.2 <1.0 48
<1.0 <1.0 56.4 :---------1----------1----------<1.0 <1.0 49.8
<1.0 <1.0 62.2
<1.0 <1.0 73.1
<1.0 <1.0 55.3
<1.0 <1.0 55.5
<1.0 <1.0 56.4
<1.0 <1.0 55.3
<1.0 <1.0 57.2
<1.0 <1.0 49.8
<1.0 <1.0 51.4
<1.0 <1.0 51
<1.0 <1.0 49.7
<60 140 J 52
<1.0 <1.0 54
<1.0 <1.0 52.4
<1.0 <1.0 53.3
<1.0 <1 .0 45.4
<1.0 <1 .0 46.8
1.4 <1.0 45.3
<1.0 <1.0 48.8
<1.0 <1 .0 49.0
<1.0 <1.0 51.9
<1.0 <1.0 48.6
<1.0 <1 .0 46.3
3.86 <1.0 43.3
<1.0 <1 .0 49.5
<1.0 <1.0 37.7
<1.0 <1 .0 40.2
<1.0 <1.0 48.4
<1.0 <1.0 41.5
Nitrate, Nitrate + Nitrite
110mq/Ll
8.7
10.3
9.4
9.4
9.2
100
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
6.8 ►-----------6.7
3.0
7.0
6.8
7.4
7.8
8.01
8.47
6.92
5.4
7.33 ►-----------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
TABLE 1 (15 of 33)
Historic Summary Of Monitoring Well Analytical Results Up To The 1st Quarter 2022
Chloroform Contamination Investigation
TW4-12
Sampling Event
Carbon Tetrachloride Chloroform
15 ua/Ll 170 ua/LI
1stQtr 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 3/9/2006 <1.0 <1.0
2nd Qtr 6/14/2006 <1.0 <1.0
3rdQtr 7/20/2006 <1.0 <1.0
4th Qtr 11/8/2006 <1.0 <1.0
1stQtr 2/28/2007 <1.0 <1.0
2nd Qtr 6/27/2007 <1.0 <1.0
3rdQtr 8/15/2007 <1.0 <1.0
4th Qtr 10/10/2007 <1.0 <1.0
1stQtr 3/28/2008 <1.0 <1.0
2nd Qtr 6/25/2008 <1.0 <1.0
3rdQtr 9/10/2008 <1.0 <1.0
4th Qtr 10/15/2008 <1.0 <1.0
1stQtr 3/11/2009 <1.0 <1.0
2nd Qtr 6/23/2009 <1.0 <1.0
3rdQtr 9/14/2009 <1.0 <1.0
4th Qtr 12/16/2009 <1.0 <1.0
1stQtr 2/23/2010 <1.0 <1.0
2nd Qtr 6/14/2010 <1.0 <1.0
3rdQtr 8/10/2010 <1.0 <1.0
4th Qtr 10/15/2010 <1.0 <1.0
1stQtr 2/15/2011 <1.0 <1.0
2nd Qtr 5/25/2011 <1.0 <1.0
3rdQtr 8/16/2011 <1.0 <1.0
4th Qtr 11/15/2011 <1.0 <1.0 lsfOff(f) 111112012 <1.0 <1.0
2nd Qtr 5/31/2012 <1.0 -::-ro-----
3rdQtr 8/29/2012 <1.0 <1.0
4th Qtr 10/3/2012 <1.0 <1.0
1stQtr 2/13/2013 <1.0 <1.0
2nd Qtr 5/29/2013 <1.0 <1.0
3rdQtr 8/29/2013 <1.0 <1.0
4th Qtr 11/6/2013 <1.0 <1.0
1stQtr 1/22/2014 <1.0 <1.0
2nd Qtr 5/21/2014 <1.0 <1.0
3rdQtr 8/27/2014 <1.0 <1.0
4thQtr 10/23/2014 <1.0 <1.0
1stQtr 3/11/2015 <1.0 <1.0
2nd Qtr 6/10/2015 <1.0 <1.0
3rd Qtr 9/2/2015 <1.0 <1.0
4thQtr 10/21/2015 <1.0 <1.0
Oeolicate TW4--65 <1.0 <1.0
1stQtr 3/15/2016 <1.0 <1.0
2ndQtr 5/25/2016 <1.0 <1.0
DeplicateTW4-E 5/25/2016 <1.0 <1.0
3rdQtr 7/27/2016 <1.0 <1.0
4thQtr 10/12/2016 <1.0 <1.0
1stQtr 3/14/2017 <1.0 <1.0
2ndQtr 6/14/2017 <1.0 1.25
3rd Qtr 8/2/2017 <1.0 1.2
Oeplicate TW4-70 <1.0 1.19
4thQtr 10/10/2017 <1.0 <1.0
Deolicate TW4-70 <1.0 <1.0
\stQtr 3/14/2018 <1.0 <1.0
2ndQtr 6/12/2018 <1.0 <1.0
3rd Qtr 8/29/2018 <1.0 <1.0
4th Qtr 11/30/2018 <1.0 <1.0
1stQtr 3/16/2019 <1.0 <1.0
2ndQtr 6/13/2019 <1 .0 <1.0
3rd Qtr 9/11/2019 <1.0 <1.0
4th Qtr 12/14/2019 <1.0 <1.0
1stQtr 3/17/2020 <1 .0 <1.0
2ndQtr 6/11/2020 <1.0 <1.0
3rdQtr 9/17/2020 <1.0 <1.0
4th Qtr 11/4/2020 <1 .0 <1.0
1stQtr 3/17/2021 <1.0 <1.0
2ndQtr 6/15/2021 <1.0 <1.0
3rdQtr 9/15/2021 <1 .0 <1.0
4th Qtr 12/7/2021 <1.0 <1.0
1stQtr 3/15/2022 <1 .0 <1.0
(11. As of March 2012 both north and south wild life ponds no I0!:!9er recerv1n!Lwater.
NA = not analyzed
Shaded indicates concentrations exceeding GWQS.
DUSA White Mesa Mill
Parameter
IGWQSl
Chloromethane Methylene Chloride Chloride
130 ua/Ll 15 ua/Ll No GWQS Ima/LI
NA NA NA
NA NA NA
5.8 <1.0 NA
1.0 <1.0 19
2.6 <1.0 19
1.4 <1.0 16
1.4 <1.0 16
<1.0 <1.0 16
<1.0 <1.0 16
<1.0 <1.0 18
<1.0 <1.0 29
<1.0 <1.0 16
<1.0 <1.0 16
<1.0 <1.0 19
<1.0 <1.0 18
<1.0 <1.0 22
<1.0 <1.0 23
<1.0 <1.0 22
<1.0 <1.0 22
<1.0 <1.0 23
<1.0 <1.0 22
<1.0 <1.0 29
<1.0 <1.0 35
<1.0 <1.0 31
<1.0 <1.0 31
<1.0 <1.0 32
<1.0 <1.0 31
<1 .0 <1.0 30
<1.0 <1.0 28
<1.0 ------1-------------------34 <1.0
<1 .0 <1.0 39
<1.0 <1.0 39
<1.0 <1.0 36.7
<1.0 <1.0 38.6
<1.0 <1.0 41 .7
<1.0 <1.0 41.4
<1.0 <1.0 41.6
<1.0 <1.0 40.2
<1.0 <1.0 47
<1 .0 <1.0 50.2
<1.0 <1.0 50.6
<1.0 <1.0 56
<1.0 <1.0 60.2
<1.0 <1.0 51
<1 .0 <1.0 51 .3
<1 .0 <1.0 56.2
<1 .0 <1.0 66.4
<1 .0 <1.0 67
<1 .0 <1.0 67.5
<1 .0 <1.0 72.6
<1 .0 <1.0 62.6
<1 .0 <1.0 67.2
<1 .0 <1.0 65.3
<1 .0 <1.0 67
<1 .0 <1.0 56.2
<1 .0 <1.0 61.4
<1.0 <1.0 59.5
<1 .0 <1.0 53.6
<1.0 <1.0 59.9
<1 .0 <1.0 56.1
<1.0 <1.0 50.8
<1.0 <1.0 55.3
<1 .0 <1.0 52.6
<1.0 <1.0 58.0
<1.0 <1.0 53.0
<1.0 <1.0 51.7
<1.0 <1.0 50.3
<1.0 <1.0 48.0
<1.0 <1.0 52.0
<1.0 <1.0 51.8
<1.0 <1.0 36.1
<1.0 <1.0 49.8
<1.0 <1.0 25.8
Nitrate, Nitrate + Nitrite
110 ma/Ll
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
7.7
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
804
6.39
4.95
2.34
5.91
3.10
2.39
1.95
1.46
8.4
TABLE 1 (16 of 33)
Historic Summary Of Monitoring Well Analytical Results Up To The 1st Quarter 2022
Chloroform Contamination Investigation
TW4-13
Sampling Event
Carbon Tetrachloride Chloroform
15 ua/Ll 170 ua/Ll
1s!Qtr 3/16/2005 NA <1.0
2ndQtr 5/25/2005 NA <1.0
3rdQtr 8/31/2005 <1.0 <1.0
4thQtr 12/7/2005 <1.0 <1.0
1s!Qtr 3/9/2006 <1.0 <1.0
2ndQtr 6/14/2006 <1.0 <1.0
3rdQtr 7/20/2006 <1.0 <1.0
4thQtr 11/8/2006 <1.0 <1.0
1s!Qtr 2/28/2007 <1.0 <1.0
2ndQtr 6/27/2007 <1.0 <1.0
3rdQtr 8/15/2007 <1.0 <1.0
4thQtr 10/10/2007 <1.0 <1.0
1s!Qtr 3/28/2008 <1.0 <1.0
2ndQtr 6/25/2008 <1.0 <1.0
3rdQtr 9/10/2008 <1.0 <1.0
41hQtr 10/15/2008 <1.0 <1.0
1s!Qtr 3/4/2009 <1.0 <1.0
2ndQtr 6/23/2009 <1.0 <1.0
3rdQtr 9/14/2009 <1.0 <1.0
4thQtr 12/16/2009 <1.0 <1.0
1s!Qtr 2/24/2010 <1.0 <1.0
2ndQtr 6/14/2010 <1.0 <1.0
3rdQtr 8/10/2010 <1.0 <1.0
4thQtr 10/15/2010 <1.0 <1.0
1s!Qtr 2/15/2011 <1.0 <1.0
2ndQtr 5/25/2011 <1.0 <1.0
3rdQtr 8/16/2011 <1.0 <1.0
4thQtr 11/15/2011 <1.0 <1.0 "fafOlr"(ff" 111712012 <1.0 <1.0
2nd Qtr ----5/31/2012 ~------<1.0 <1.0
3rdQtr 8/29/2012 <1.0 <1.0
41hQtr 10/3/2012 <1.0 <1.0
1s!Qtr 2/13/2013 <1.0 <1.0
2ndQtr 5/29/2013 <1.0 <1.0
3rdQtr 8/29/2013 <1.0 <1.0
4thQtr 11/6/2013 <1.0 <·1.0
1s!Qtr 1/22/2014 <1.0 <1.0
2ndQtr 5/21/2014 <1.0 <1.0
3rdQtr 8/23/2014 <1.0 <1.0
4thQtr 10/23/2014 <1.0 <1.0
1s!Qtr 3/11/2015 <1.0 <1.0
2ndQtr 6/10/2015 <1.0 <1.0
3rdQtr 9/2/2015 <1.0 <1.0
4thQtr 10/21/2015 <1.0 <1.0
1s!Qtr 3/16/2016 <1.0 <1.0
2ndQtr 5/25/2016 <1.0 <1.0
3rdQtr 7/28/2016 <1.0 <1.0
4thQtr 10/19/2016 <1.0 <1.0
1s!Qtr 3/16/2017 <1.0 <1.0
2ndQtr 6/15/2017 <1.0 <1.0
3rdQtr 8/2/2017 <1.0 <1.0
4thQtr 10/10/2017 <1.0 <1.0
1s!Qtr 3/14/2018 <1.0 <1.0
2ndQtr 6/12/2018 <1.0 <1.0
3rdQtr 8/29/2018 <1.0 <1.0
4thQtr 11/30/2018 <1.0 <1.0
1s!Qtr 3/16/2019 <1.0 <1.0
2ndQtr 6/13/2019 <1.0 <1.0
3rdQtr 9/11/2019 <1.0 <1.0
4thQtr 12/14/2019 <1.0 <1.0
1s!Qtr 3/17/2020 <1.0 <1.0
2ndQtr 6/11/2020 <1.0 <1:0
3rdQtr 9/17/2020 <1.0 <1.0
4thQtr 11/4/2020 <1.0 <1.0
1s!Qtr 3/17/2021 <1.0 <1.0
2ndQtr 6/15/2021 <1.0 <1.0
3rdQtr 9/15/2021 <1.0 <1.0
4thQtr 12/7/2021 <1.0 <1.0
1s!Qtr 3/16/2022 <1.0 <1.0
J.11 As of March 2012 both north and south wild life ponds no longer rece1vin!L,water.
NA = not analyzed
Shaded indicates concentrations exceeding GWQS.
DUSA White Mesa Mill
Parameter
IGWQSl
Chloromethane Methylene Chloride Chloride
130 ua/Ll 15 ua/Ll No GWQS Ima/LI
NA NA NA
NA NA NA
3.1 <1.0 NA
<1.0 <1.0 69
1.7 <1.0 67
1.4 <1.0 66
<1.0 <1.0 65
<1.0 <1.0 33
<1.0 <1.0 59
<1.0 <1.0 59
<1.0 <1.0 58
<1.0 <1.0 58
<1.0 <1.0 54
<1.0 <1.0 58
<1.0 <1.0 50
<1.0 <1.0 58
<1.0 <1.0 58
<1.0 <1.0 57
<1.0 <1.0 63
<1.0 <1.0 60
<1.0 <1.0 53
<1.0 <1.0 53
<1.0 <1.0 55
<1.0 <1.0 55
<1.0 <1.0 60
<1.0 <1.0 56
<1.0 <1.0 60
<1.0 <1.0 54
<1.0 <1.0 5·1,
<1.0 ------~----------,_ ________ 59
<1.0
<1.0 <1.0 60
<1.0 <1.0 60
<1.0 <1.0 59.3
<1.0 <1.0 56
<1.0 <1.0 63.5
<1.0 <1.0 58.5
<1.0 <1.0 63.1
<1.0 <1.0 56.1
<1.0 <1.0 62
<1.0 <1.0 66.1
<1.0 <1.0 66.4
<1.0 <1.0 70.3
<1.0 <1.0 76.5
<1.0 <1.0 65.5
<1.0 <1.0 69.4
<1.0 <1.0 71.8
<1.0 <1.0 69.3
<1.0 <1.0 70.9
<1.0 <1.0 66.0
<1.0 <1.0 70.4
<1.0 <1.0 70.5
<1.0 <1.0 60.9
<1.0 <1.0 71.0
<1.0 <1.0 65.0
<1.0 <1.0 73.7
<1.0 <1.0 64.5
<1.0 <1.0 61.6
<1.0 <1.0 65.4
<1.0 <1.0 65.3
<1.0 <1.0 68.7
<1.0 <1.0 63.9
<1.0 <1.0 62.7
<1.0 <1.0 60.2
<1.0 <1.0 60.6
<1.0 <1.0 67.3
<1.0 <1.0 57.7
<1.0 <1.0 54.2
<1.0 <1.0 61.0
<1.0 <1.0 59.2
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
5.5
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
TW4-14
Sampling Event
1stQtr 3/16/2005
2ndQtr 5/25/2005
3rdQtr 8/31/2005
4thQtr 12/7/2005
1stQtr 3/9/2006
2ndQtr 6/14/2006
3rdQtr 7/20/2006
4thQtr 11/8/2006
1stQtr 2/28/2007
2ndQtr 6/27/2007
3rdQtr 8/15/2007
4thQtr 10/10/2007
1stQtr 3/28/2008
2ndQtr 6/25/2008
3rdQtr 9/10/2008
4thQtr 10/15/2008
1stQtr 3/4/2009
2ndQtr 6/23/2009
3rdQtr 9/14/2009
4thQtr 12/16/2009
1stQtr 3/23/2010
2ndQtr 6/14/2010
3rdQtr 8/10/2010
4thQtr 10/15/2010
1stQtr 2/15/2011
2ndQtr 6/24/2011
3rdQtr 8/16/2011
4thQtr 11/15/2011 ·mctrr1:, _ 1,1112012
2nd Qtr 6/14/2012
3rdQtr 8/29/2012
4thQtr 10/3/2012
1stQtr 2/7/2013
2ndQtr 5/29/2013
3rdQtr 8/29/2013
4thQtr 11/6/2013
1stQtr 1/22/2014
2ndQtr 5/21/2014
3rdQtr 8/13/2014
4thQtr 10/23/2014
1stQtr 3/12"!015
2ndQtr 6/10/2015
3rdQtr 9/3/2015
4thQtr 10/23/2015
1stQtr 3/16/2016
2ndQtr 5/26/2016
3rdQtr 8/3/2016
4thQtr 10/20/2016
1stQtr 3/1512017
2ndQtr 6/15/2017
3rdQtr 8/212017
4thQtr 10/10/2017
1s!Qtr 3/15/2018
2ndQtr 6/13/2018
3rdQtr 8/30/2018
4thQtr 12/12/2018
1s!Qtr 3/16/2019
2ndQtr 6/13/2019
3rdQtr 9/11/2019
4th Qtr 12/14/2019
1st Qtr · ·· · ······311712020
2ndQtr 6/11/2020
3rdQtr 9/18/2020
4thQtr 11/4/2020
1s!Qtr 3/18/2021
2ndQtr 6/16/2021
3rdQtr 9/15/2021
4thQtr 12/8/2021
1stQtr 3/16/2022
TABLE 1 (17 of 33)
Historic Summary Of Monitoring Well Analytical Results Up To The 1st Quarter 2022
Chloroform Contamination Investigation
DUSA White Mesa Mill
Parameter
IGWQSl
Carbon Tetrachloride Chloroform Chloromethane Methylene Chloride Chloride
15 ua/Ll 170 ua/Ll 130 ua/Ll 15 ua/Ll No GWQS (mg/Ll
NS NS NS NS NS
NS NS NS NS NS
NS NS NS NS NS
NS NS NS NS NS "i;js NS "fis NS NS
NS NS NS NS NS
NS NS NS NS NS
<1.0 NS <1.0 <1.0 37
<1.0 <1.0 <1.0 <1.0 38
<1.0 <1.0 <1.0 <1.0 38
<1.0 <1.0 <1.0 <1.0 36
<1.0 <1.0 <1.0 <1.0 38
<1.0 <1.0 <1.0 <1.0 57
<1.0 <1.0 <1.0 <1.0 35
<1.0 <1.0 <1.0 <1.0 34
<1.0 <1.0 <1.0 <1.0 40
<1.0 <1.0 <1.0 <1.0 35
<1.0 <1.0 <1.0 <1.0 36
<1.0 <1.0 <1.0 <1.0 38
<1.0 <1.0 <1.0 <1.0 34
<1.0 <1.0 <1.0 <1.0 33
<1.0 <1.0 <1.0 <1.0 49
<1.0 <1.0 <1.0 <1.0 35
<1.0 <1.0 <1.0 <1.0 29
<1.0 <1.0 <1.0 <1.0 :is
<1.0 <1.0 <1.0 <1.0 24
<1.0 <1.0 <1.0 <1.0 33
<1.0 <1.0 <1.0 <1.0 15
<1.0 <1.0 <1.0 <1.0 20
<1.0 :-------<1.0 :---------<1.0 r"'---------<1.0 ---------35
<1.0 <1.0 <1.0 <1.0 37
<1.0 <1.0 <1.0 <1.0 37
<1.0 <1.0 <1.0 <1.0 35.2
<1.0 <1.0 <1.0 <1.0 38.6
<1.0 <1.0 <1.0 <1.0 37.6
<1.0 <1.0 <1.0 <1.0 36.5
<1.0 <1.0 <1.0 <1.0 35.5
<1.0 <1.0 <1.0 <1.0 32.5
<1.0 <1.0 <1.0 <1.0 38
<1.0 <1.0 <1.0 <1.0 38.9
<1.0 1.7 <1.0 <1.0 40.1
<1.0 1.82 <1.0 <1.0 41.8
<1.0 <1.0 <1.0 <1.0 42.4
<1.0 1.46 <1.0 <1.0 40.6
<1.0 4.49 <1.0 2.18 42.4
<1.0 6.15 <1.0 3.18 43.6
<1.0 5 <1.0 1.8 42.4
<1.0 702 <1.0 1.59 45.6
<1.0 6.45 <1.0 2.18 45.4
<1.0 6.85 <1.0 <1.0 46.9
<1.0 6.14 <1.0 <1.0 46.4
<1.0 6.13 <1.0 <1.0 42.5
<1.0 5.8 <1.0 2.18 51.5
<1.0 5.12 <1.0 <1.0 46.9
<1.0 4.76 <1.0 <1.0 54.1
<1.0 4.41 <1.0 <1.0 48.7
<1.0 4.08 <1.0 <1.0 48.7
<1.0 4.18 <1.0 <1.0 48.3
<1.0 6.08 <1.0 <1.0 45.4
<1.0 3.83 <1.0 <1.0 49.4
<1.0 2.98 <1.0 <1.0 48.4
<1.0 2.87 <1.0 <1.0 47.6
<1.0 2.41 <1.0 <1.0 45.1
<1.0 2.69 <1.0 <1.0 49.7
<1.0 1.77 <1.0 <1.0 48.2
<1.0 <1.0 <1.0 <1.0 49.5
<1.0 <1.0 <1.0 <1.0 34.1
<1.0 <1.0 <1.0 <1.0 49.0
<1.0 <1.0 <1.0 <1.0 42.0
(1) As of March 2012 both north and south wild life ponds no lo~er receivin~ water.
NS = not sampled
Shaded indicates concentrations exceeding GWQS.
Nitrate, Nitrate + Nitrite
(10mg/L)
NS
NS
NS
NS "fis
NS
NS
2.4
2.3
1.4
1.1
0.8
0.4
1.6
1.38
0.76
1.6
1.4
1.5
1.4
2.5
2.9
2.8
2.9
1.8
1.4
2.6
1.7
1.9 ►-----------3.3
3.9
3.9
4.6
4.4
4.51
4.81
5.92
4.87
4.1
5.22
5.22
3.55
2.77
2.45
2.94
2.45
2.88
2.86
4.36
5.12
4.84
4.73
5.67
6.36
5.34
5.85
6.16
5.86
4.77
4.76
6.17
6.57
5.57
5.81
5.56
7.02
5.56
5.70
5.9
TW4-16
Sampling Event
TABLE 1 (18 of 33)
Historic Summary Of Monitoring Well Analytical Results Up To The 1st Quarter 2022
Chloroform Contamination Investigation
DUSA White Mesa Mill
Parameter
(GWQS)
Carbon Tetrachloride Chloroform Chloromethane Methylene Chloride Chloride Nitrate, Nitrate + Nitrite
15 ua/Ll 170 ua/Ll
1stQtr 3/16/2005 NA 240 NA
2ndQtr 5/25/2005 NA 212 NA
3rd Qtr 8/31/2005 <1.0 85
4thQtr 1217/2005 <1.0 14
1stQtr 3/9/2006 <1.0 39
2ndQtr 6/14/2006 <1.0 13
3rd Qtr 712012006 <1.0 5.2 <1.0
4th Qtr 11/8/2006 <1.0 13.6 <1.0
1stQtr 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
3rdQtr 9/10/2008 <1.0 10 <1.0
4th Qtr 10/15/2008 <1.0 3.9 <1.0
1stQtr 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
1stQtr 3/24/2010 <1.0 <1.0 <1.0
2ndQtr 6/14/2010 <1.0 2.1 <1.0
3rd Qtr 8/24/2010 <1.0 4.3 <1.0
4thQtr 10/15/2010 <1.0 3 <1.0
1stQtr 2/22/2011 <1.0 15 <1.0
2ndQtr 5/26/2011 <1.0 16 <1.0
3rd Qtr 8/17/2011 <1.0 9.2 <1.0
4thQtr 11/16/2011 NA NA NA
1sfQfrm ~71~;~~;~ <1.0 <1.0 <1.0
<1.0 <1.0 <1.0
2nd Qtr 512612012 <1.0 -:;f:-o _____ <1.0
3rdQtr 8/30/2012 <1.0 <1.0 <1.0
4thQtr 10/3/2012 <1.0 <1 .0 <1.0
1stQtr 2/7/2013 <1.0 <1.0 <1.0
2nd Qtr 5/30/2013 <1.0 <1.0 <1.0
3rdQtr 9/5/2013 <1.0 <1.0 <1.0
4th Qtr 1117/2013 <1.0 13.4 <1.0
1stQtr 1/29/2014 <1.0 6.93 <1.0
2nd Qtr 5/22/2014 <1.0 14.6 <1.0
3rdQtr(2) 8/14/2014 <1.0 229 <1.0
3rdQtr 9/24/2014 <1.0 371 <1.0
4th Qtr 10/29/2014 <1.0 387 <1.0
1stQtr 3/12/2015 <1.0 153 <1.0
2nd Qtr 6/11/2015 <1.0 65.3 <1.0
3rdQtr 9/3/2015 <1.0 82 <1.0
4th Qtr 10/28/2015 <1.0 112 <1.0
1stQtr 3/17/2016 <1.0 45.9 <1.0
2nd Qtr 5/26/2016 <1.0 93.4 <1.0
3rdQtr 8/3/2016 <1.0 49 <1.0
4th Qtr 10/26/2016 <1.0 92.9 <1.0
1stQtr 3/16/2017 <1.0 19.1 <1.0
2nd Qtr 6/20/2017 <1.0 64.3 <1.0
3rdQtr 8/3/2017 <1.0 143 <1.0
4th Qtr 10/11/2017 <1.0 98 <1.0
OWMRC solit samcle <0.95 92 <1.5
1stQtr 3/20/2018 <1.0 170 <1.0
Duplicate TW4-75 <1.0 171 <1.0
2ndQtr 6/14/2018 <1.0 54.5 <1.0
3rd Qtr 8/30/2018 <1.0 54.5 <1.0
4thQtr 12/12/2018 <1.0 52.0 <1.0
1stQtr 3/19/2019 <1.0 60.6 <1.0
2ndQtr 6/19/2019 <1.0 76.2 <1.0
3rd Qtr 9/12/2019 <1.0 99.8 <1.0
4th0tr 12/14/2019 <1 .0 94.3 <1.0
Duplicate TW4-75 <1.0 91.0 <1.0 .i.stQtr 3/18/2020 <1.0 113 <1.0
2ndQtr 6/12/2020 <1 .0 141 <1.0
3rd Qtr 9/19/2020 <1 .0 220 <1.0
4thQtr 11/11/2020 <1.0 270 <1.0
Duplicate TW4-75 <1.0 277 <1.0
DWMRC solit sam le <10 290 <20
1stQtr 3/24/2021 <1.0 248 <1.0
2ndQtr 6/17/2021 <1.0 247 <1.0
3rd Qtr 9/23/2021 <1.0 202 <1.0
4th0tr 12/8/2021 <1.0 189 <1.0
1stQtr 3/23/2022 <1.0 150 <1.0
(1) VOCs were resampled because laboratory missed holding time.
{2) VOCs were resampled (3) As of March 2012 both north and south wild hfe ponds no longer rece1v1ng water.
NA= not analyzed
Shaded indicates concentrations exceeding GWQS.
J = Approximate value
H = Sample was analyzed beyond holding times and may not be accureate concentration.
130 ua/Ll 15 ua/L) No GWQS (mg/L) (10 mg/L)
NA NA <0.1
NA NA <0.1
3.2 43 NA <0.1
2.6 5.9 64 1.4
1.1 21 60 3
2.4 8.9 55 1.9
2.7 60 2.7
9.2 62 5.6
6.6 79 12.3
1.8 75 9.9
5.1 65 5.4
1 69 4.4
26 52 <0.1
<1.0 58 1.5
14 71 10.5
6.6 89 9.8
<1.0 73 9.6
<1.0 76 8.9
<1.0 79 8.8
<1.0 76 5.2
<1.0 77 4.2
<1.0 64 4.7
<1.0 72 4.6
<1.0 71 3.3
<1.0 86 7
<1.0 81 5
<1.0 63 1.7
NA 38 0.4
1.4 NA
1.7 48 0.1 I----------~---------<1.0 53 <0.1
<1.0 59 <0.1
<1.0 59 <0.1
<1.0 58.1 <0.1
4.21 49.8 <0.1
<1.0 54.4 <0.1
<1.0 56.6 1.37
<1.0 66.8 3.16
<1.0 80.7 4.94
<1.0 80 5.1
<1.0 NA NA
<1.0 92.1 8.4
<1.0 65 4.3
<1.0 61 1.06
<1.0 65.8 1.18
<1.0 58.3 1.69
<1.0 56.5 1.63
<1.0 61.3 1.89
<1.0 60 2.20
<1.0 66.7 278
<1.0 62.2 2.75
<1.0 60.6 1.81
<1.0 67.1 2.63
<1.0 54.2 2.12
1.9 J 64 2.00
<1.0 85.1 4.55
<1.0 84.7 4.51
<1.0 62.5 2.83
<1.0 73 2.53
<1.0 68.8 2.88
<1.0 66.3 3.36
<1.0 71.5 2.43
<1.0 72.9 3.55
<1 .0 88.6 3.37
<1.0 84.1 3.12
<1.0 76.2 3.91
<1.0 79.7 4.44
<1 .0 77.4 4.74
<1.0 85.9 5.73
<1.0 85.6 5.74
<20 87.0 0.37 H
<1.0 92.6 5.82
<1.0 87.4 6.74
<1 .0 77.4 4.74
<1 .0 89.9 4.85
<1 .0 84.3 5.0
TABLE 1 (19 of 33)
Historic Summary Of Monitoring Well Analytical Results Up To The 1st Quarter 2022
Chloroform Contamination Investigation
TW4-18
Sampling Event
DUSA White Mesa Mill
Parameter
(GWQS)
Carbon Tetrachloride Chloroform Chloromethane Methylene Chloride
(5 µg/L) (70 µg/L) (30 µg/L) (5 µg/L)
1st Qtr 3/16/2005 NA 38 NA NA
2nd Qtr 5/25/2005 NA 29.8 NA NA
3rd Qtr 8/31/2005 <1.0 39 2.8 <1.0
Chloride
No GWQS (mg/L)
NA
NA
NA
4th Qtr 12/7/2005 <1.0 14 1.1 <1.0 41
1stQtr 3/9/2006 <1.0 12 1.6 <1.0 36
2nd Qtr 6/14/2006 <1.0 12 2.7 <1.0 35
3rd Qtr 7/20/2006 <1.0 10.8 <1.0 <1.0 35
4th Qtr 11/8/2006 <1.0 12.5 <1.0 <1.0 34
1stQtr 2/28/2007 <1.0 9.2 <1.0 <1.0 30
2nd Qtr 6/27/2007 <1.0 8 <1.0 <1.0 28
3rd Qtr 8/15/2007 <1.0 8.9 <1.0 <1.0 32
4th Qtr 10/10/2007 <1.0 7.4 <1.0 <1.0 27
1stQtr 3/28/2008 <1.0 6.4 <1.0 <1.0 23
2ndQtr 6/25/2008<1.0 5.7<1.0 <1.0 23
3rd Qtr 9/10/2008 <1.0 8 <1.0 <1.0 26
4thQtr 10/15/2008<1.0 9.4<1.0 <1.0 30
1st Qtr 3/4/2009 <1.0 11 <1.0 <1.0 29
2nd Qtr 6/23/2009 <1.0 16 <1.0 <1.0 30
3rd Qtr 9/14/2009 <1.0 13 <1.0 <1.0 26
4th Qtr 12/17/2009 <1.0 8.2 <1.0 <1.0 30
1st Qtr 3/24/2010 <1.0 69 <1.0 <1.0 41
2nd Qtr 6/14/2010 <1.0 29 <1.0 <1.0 35
3rd Qtr 8/12/2010 <1.0 29 <1.0 <1.0 37
4th Qtr 10/15/2010 <1.0 30 <1.0 <1.0 50
1stQtr 2/22/201 1 <1.0 39<1.0 <1.0 52
2nd Qtr 5/26/2011 <1.0 26 <1.0 <1.0 36
3rdQtr 8/17/201 1 <1.0 29 <1.0 <1.0 23
4th Qtr 11/16/201 1 NA NA NA NA 23
Nitrate, Nitrate + Nitrite
(10 mg/L)
14.1
12.9
13.3
7.3
5.9
4.7
6.1
5.7
5.1
4.9
5.0
4.4
0.7
4.6
4.9
5.2
5.2
6.2
5.9
5.4
5.1
9.0
9.0
10.0
10.0
9.0
4.6
6.3
(1\ 12/7/2011 <1.0 28 <1.0 <1.0 NA NA
fafQfr"(21 1/18/2012 <1.0 25 <1.0 <1.0 18 ~---------------~ --------~ --------2nd Qtr 6/13/2012 <1.0 24 <1.0 <1.0 30
3rd Qtr 9/11/2012 <1.0 38 <1.0 <1.0 26
4th Qtr 10/3/2012 <1.0 30 <1.0 <1.0 27
1st Qtr 2/13/2013 <1.0 34.9 <1.0 <1.0 23.1
2nd Qtr 6/13/2013 <1.0 37.9 <1.0 <1.0 22.9
3rd Qtr 9/5/2013 <1.0 41 <1.0 <1.0 36.2
4thQtr 11/13/2013 <1.0 44.3 <1.0 <1.0 37.1
1stQtr 1/30/2014 <1.0 6.93 <1.0 <1.0 38.9
2nd Qtr 5/22/2014 <1.0 6.93 <1.0 <1.0 47
3rd Qtr 8/14/2014 <1.0 32.8 <1.0 <1.0 49
4th Qtr 10/28/2014 <1.0 33 <1.0 <1.0 40.8
1stQtr 3/12/2015 <1.0 32 <1.0 <1.0 41.6
2nd Qtr 6/11/2015 <1.0 30.5 <1.0 <1.0 43.5
3rd Qtr 9/3/2015 <1.0 28.7 <1.0 <1.0 47.6
4th Qtr 10/28/2015 <1.0 52.9 <1.0 <1.0 39.4
1st Qtr 3/17/2016 <1.0 56.6 <1.0 <1.0 40.7
2nd Qtr 6/8/2016 <1.0 60 <1.0 <1.0 43.8
3rd Qtr 8/3/2016 <1.0 56.3 <1.0 <1.0 40.7
4th Qtr 10/26/2016 <1.0 60.1 <1.0 <1.0 43.9
1stQtr 3/16/2017 <1.0 62 <1.0 <1.0 39.4
DuplicateTW4-75 <1.0 61.5 <1.0 <1.0 41.1
2nd Qtr 6/20/2017 <1.0 63.8 <1.0 <1 .0 41.6
3rd Qtr 8/3/2017 <1.0 62.8 <1.0 <1.0 40.4
DuplicateTW4-75 <1.0 62.3 <1.0 <1.0 41.5
4th Qtr 10/11/2017 <1.0 62.9 <1.0 <1.0 37.1
1stQtr 3/15/2018 <1.0 62.3 <1.0 <1.0 44.3
2nd Qtr 6/13/2018 <1.0 59.9 <1.0 <1.0 39.5
3rd Qtr 8/30/2018 <1.0 56.2 <1.0 <1.0 45.6
4th Qtr 12/13/2018 <1.0 57.6 <1.0 <1.0 38.2
1stQtr 3/19/2019 <1.0 52.8 <1.0 <1.0 37.6
2nd Qtr 6/19/2019 <1.0 54.2 <1.0 <1.0 39.5
Duplicate TW4-75 <1.0 54.4 <1.0 <1 .0 40.8
3rd Qtr 9/11/2019 <1.0 56.2 <1.0 <1.0 36.8
4th Qtr 12/18/2019 <1.0 62.0 <1.0 <1.0 42.7
1stQtr 3/18/2020 <1.0 57.0 <1.0 <1.0 39.4
2nd Qtr 6/12/2020 <1.0 58.2 <1.0 <1.0 41.4
3rd Qtr 9/18/2020 <1.0 60.0 <1.0 <1.0 38.7
4th Qtr 11/11/2020 <1.0 58.6 <1.0 <1.0 39.6
DWMRCsolrtsam le <10 56.0 <20 <20 41.0
1stQtr 3/18/2021 <1.0 52.0 <1.0 <1.0 41.8
2nd Qtr 6/16/2021 <1.0 58.2 <1.0 <1.0 41.4
3rd Qtr 9/22/2021 <1.0 49.9 <1.0 <1.0 29.8
4th Qtr 12/8/2021 <1.0 57.0 <1.0 <1.0 41.1
1stQtr 3/23/2022 <1.0 56.0 <1.0 <1.0 39.1
(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.
NA :: not analyzed
Shaded indicates concentrations exceeding GWQS.
4.4
6.6
6.6
6.0
5.6
8.9
121
14.2
12.8
12.2
9.8
11.1
11.7
9.69
15.7
6.24
5.96
5.45
5.79
5.24
4.47
4.41
4.50
4.24
4.31
4.43
4.32
4.09
3.51
3.60
3.85
401
2.95
3.25
302
3.71
3.62
3.36
3.67
3.30
3.61
3.62
3.37
3.90
3.4
TW4-19
(chlorofrom pumping well
started 4/30/03)
Sampling Event
1stQtr 3/16/2005
2nd Qtr 5/25/2005
3rdQtr 8/31/2005
4th Qtr 1217/2005
1stQtr 3/9/2006
2nd Qtr 6/14/2006
3rdQtr 7/20/2006
4th Qtr 11/8/2006
1stQtr 2/28/2007
2nd Qtr 6/27/2007
3rdQtr 8/15/2007
4thQtr 10/10/2007
1stQtr 3/28/2008
2nd Qtr 6/25/2008
3rdQtr 9/10/2008
4th Qtr 10/15/2008
1stQtr 3/4/2009
2nd Qtr 6/23/2009
TABLE 1 (20 of 33)
Historic Summary Of Monitoring Well Analytical Results Up To The 1st Quarter 2022
Chloroform Contamination Investigation
DUSA White Mesa Mill
Parameter
(GWQS)
Carbon Tetrachloride Chloroform Chloromethane Methylene Chloride Chloride
(5 UQ/L) (70 uq/L) (30 uQ/Ll (5 UQ/L) No GWQS fmq/Ll
NA 2,200 NA NA NA
NA 1,200 NA NA NA
<5.0 1,400 <5.0 <5.0 NA
<50 2,800 <50 <50 81 0<50 1,200 <50 <50 86
<50 1,100 <50 <50 116
<50 1,120 <50 <50 123
1.6 1 050 2.6 <1.0 134
1.3 1,200 <1.0 <1.0 133
Did not sample
1.9 1,100 <1.0 <1.0 129
1.9 1100 <1.0 <1.0 132
2.9 1,800 <1.0 <1.0 131
<1.0 1,000 <1.0 <1.0 128
8.6 3,600 <1.0 <1.0 113
12 4200 <1.0 <1.0 124
1.2 1,100 <1.0 <1.0 127
1.2 990 <1.0 <1.0 132
Nitrate, Nitrate+ Nitrite
110 mq/Ll
5.3
5.7
4.6
<0.1
4
5.2
4.3
4.6
4
4.1
4
2.2
2.8
35.2
47.8
3.2
2.4
3rdQtr 9/14/2009 15 6,600 <1 .0 <1.0 43 <0.1
4th Qtr 12/22/2009 16 4 700 <1.0 <1.0
1stQtr 2/17/2010 1.3 940 <1.0 <1.0
2nd Qtr 6/14/2010 4.2 1,800 <1.0 <1.0
3rdQtr 8/16/2010 4.9 2,000 <1.0 <1.0
4th Qtr 10/15/2010 1.3 1200 <1.0 <1.0
1stQtr 2/17/2011 17 3,400 <1.0 <1.0
2nd Qtr 617/2011 8.3 4,000 <1.0 <1.0
3rdQtr 8/17/2011 2.1 970 <1.0 <1.0
4th Qtr 11/16/2011
lsiofrH1 ~~;~~~~ 5.4 2200 <1.0 <1.0
1.5 650 <1.0 <1.0 --}J ------1-------~----------2nd Qtr 6/6/2012 1.1 460 <1.0 <1.0
3rdQtr 9/4/2012 3.5 950 <1.0 <1.0
4th Qtr 10/3/2012 4 1500 <1.0 <1.0
1stQtr 2/13/2013 5.15 4,210 <1.0 <1.0
2ndQtr 6/5/2013 5.15 2,070 <1.0 <1.0
3rd Qtr 9/3/2013 20.7 8,100 <1.0 <1.0
4thQtr 10/29/2013 6.42 942 <1.0 <1.0
1stQtr 1/27/2014 4.05 586 <1.0 <1.0
2ndQtr 5/19/2014 5.51 810 <1.0 <1.0
3rd Qtr 8/11/2014 1.9 1,410 8.3 <1.0
4thQtr 10/21/2014 4.8 4310 <1.0 <1.0
1stQtr 3/9/2015 8.92 4,660 <1.0 <1.0
2ndQtr 6/8/2015 2.62 1,570 <1.0 <1.0
3rd Qtr 8/31/2015 <1.0 7,860 7.78 <1.0
4thQtr 10/19/2015 12.2 7 840 5.46 <1.0
1stQtr 3/9/2016 13.5 7,780 1.4 <1.0
2nd Qtr 5/26/2016 23.1 12,600 <1.0 <1.0
3rdQtr 7/25/2016 9.89 6,040 <1.0 <1.0
4th Qtr 10/13/2016 10.8 6640 <1.0 <1.0
1stQtr 3/8/2017 3.06 1,240 <1.0 <1.0
2nd Qtr 6/13/2017 1.35 510 <1.0 <1.0
3rdQtr 7/26/2017 13.0 8,840 <1.0 <1 .0
4th Qtr 10/11/2017 <1 .0 129 <1.0 <1.0
1stQtr 3/12/2018 1.36 2,640 <1.0 <1 .0
2nd Qtr 6/8/2018 3.45 2,980 <1.0 <1.0
3rdQtr 8/30/2018 203 1,910 <1.0 <1.0
4th Qtr 11/28/2018 6.18 5 270 <1.0 <1 .0
1stQtr 3/8/2019 2.43 2,050 <1.0 <1.0
2nd Qtr 6/5/2019 15.9 11,500 <1.0 <1 .0
3rdQtr 9/4/2019 10.1 6,670 <1.0 <1.0
4thQtr 12/10/2019 <1.0 551 <1.0 <1.0
1stQtr 2/19/2020 13.7 8,720 5.41 <1 .0
2nd Qtr 5/27/2020 10.4 7,600 <1.0 <1.0
3rdQtr 9/4/2020 1.98 1,350 <1.0 <1.0
4thQtr 10/28/2020 1.1 660 <1.0 <1.0
1stQtr 2/23/2021 8.4 6,660 5.41 <1 .0
2nd Qtr 6/9/2021 <1.0 775 <1.0 <1.0
3rd Qtr 8/24/2021 7.83 4,450 1.98 1.25
4thQtr 12/1/2021 13.2 6 950 <1.0 <1.0
1stQtr 3/9/2022 <1.0 654 <1.0 <1.0
(1) VOCs were resampled because laboratory massed holding time.
(2) As of March 2012 both north and south wild life ponds no longer receiving water. ______ .
NA z not analyzed
Bold and italics indicates the MDL exceeded the GWQS.
Shaded indicates concentrations exceeding GWQS.
124 26.7
144 2
132 4.4
142 5.9
146 2.7
135 17.0
148 12.0
148 3.0
148 5.0
138 0.6
--------149 2.4
149 2.5
150 4.1
164 8.0
148 3.0
179 17.6
134 4.7
134 1.6
152 1.3
140 1.6
130 4.7
238 8.56
180 0.916
326 11.6
252 10.6
276 15.70
204 1.27
214 10.5
200 10.0
461 11.1
135 0.243
218 1.120
139 0.377
193 8.6
138 0.494
166 2.55
140 0?1'
197 6~: 160 8.
153 0.3
147 0.535
205 10.1
147 1.14
188 11.6
104 1.1
167 6.6
115 4.04
172 6.68
184 11.0
119 ',
TABLE 1 (21 of 33)
Historic Summary Of Monitoring Well Analytical Results Up To The 1st Quarter 2022
Chloroform Contamination Investigation
DUSA White Mesa Mill
TW4-20 Parameter
(chloroform pumping weU started (GWQS) 814105)
Sampling Event Carbon Tetrachloride Chloroform Chloromethane Methylene Chloride
(5 UQ/Ll (70 UQ/L) (30 UQ/L) (5 UQ/Ll
1stQtr 3/16/2005 Monitor well was not installed
2nd Qtr (3) 5/25/2005 NA __________ I_ __ 39,000i!:!A _______ NA 1-----------3rd Qtr 8/31/2005 <10 3,800 <10 <10
4th Qtr 1217/2005 <250 19,000 <250 <250
1stQtr 3/9/2006 <500 9,200 <500 <500
2nd Qtr 6/14/2006 <500 61,000 <500 <500
3rdQtr 7/20/2006 <1000 5,300 <1000 <1000
4th Qtr 11/8/2006 7.1 11 000 1.9 22
1stQtr 2/28/2007 3.1 4,400 <1 .0 1.1
2nd Qtr 6127/2007 2.2 1,800 <1.0 <1.0
3rdQtr 8/15/2007 3.5 5,200 <1 .0 1.8
4th Qtr 10/10/2007 6.8 9,000 <1.0 1.9
1stQtr 3/28/2008 9 13,000 <1 .0 1.5
2nd Qtr 6/25/2008 13 30,000 <1.0 1.2
3rdQtr 9/10/2008 15 21,000 <1 .0 3.7
4th Qtr 10/15/2008 NA NA NA NA
1stQtr 3/4/2009 5.7 8,200 <1 .0 5.2
2nd Qtr 6/23/2009 4.9 6,800 <1.0 4.2
3rdQtr 9/14/2009 8.4 13,000 <1 .0 4.4
4th Qtr 12/22/2009 14 15 000 <1 .0 3.0
1stQtr 2/17/2010 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
4thQtr 10/15/2010 20 24 000 <1.0 5.5
1stQtr 2/17/2011 27 31,000 <1.0 19.0
2nd Qtr 617/2011 10 8,100 <1 .0 2.1
3rdQtr 8/17/2011 7.3 3,800 <1 .0 3.1
4thQtr 11/16/2011 7.2 7 900 <1 .0 2.5 lsfQlr"!1> __ 1/23/2012 10 11,000 <1 .0 1.3 ---------33 :-----------------1-----------2ndQtr 6/6/2012 36,000 <1 .0 <1.0
3rd Qtr 9/4/2012 26 13,000 <1 .0 <1.0
4thQtr 10/3/2012 22 19000 <1 .0 <1.0
1stQtr 2/11/2013 19.6 18,500 <1.0 1.21
2ndQtr 6/5/2013 32.5 26,300 <1.0 1.3
3rd Qtr 9/3/2013 25.7 26,800 <1.0 2.14
4th Qtr 10/29/2013 17.3 15 700 <1.0 1.37
1stQtr 1/27/2014 18.4 17,800 <1.0 2.04
2ndQtr 5/19/2014 22.1 22,100 2.31 3.98
3rd Qtr 8/11/2014 14.1 12,400 55.2 2.2
4thQtr 10/21/2014 18.5 23300 404 2.38
1st Qtr 3/9/2015 20.8 19,900 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
4thQtr 10/19/2015 14.5 17 000 10.8 1
1stQtr 3/9/2016 20.2 21,600 4.09 1.16
2ndQtr 5/23/2016 40.6 33,700 <1.0 <1.0
3rd Qtr 7/25/2016 26.6 23,600 <1.0 <1.0
4th Qtr 10/12/2016 24.4 21300 <1.0 <1.0
1stQtr 3/8/2017 23.5 23,400 <1.0 <1.0
2ndQtr 6/13/2017 23.4 18,100 <1.0 <1.0
3rdQtr 7/26/2017 25.0 27,600 1.25 <1.0
4thQtr 10/12/2017 11.2 11600 2.34 <1.0
1stQtr 3/12/2018 15.9 15,400 1.77 2.36
2nd Qtr 6/14/2018 <1 .0 12,000 <1.0 7.77
3rdQtr 8/22/2018 9.85 10,500 4.98 <1 .0
4th Qtr 11/28/2018 8.32 9 500 15.6 <1.0
1stQtr 3/8/2019 15.4 15,600 <1.0 <1 .0
2nd Qtr 6/5/2019 10.1 13,700 <1.0 <1.0
3rdQtr 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
2nd Qtr 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 .
• i3lptlloroform j>UJllpinQ.. well started 8/4/05.
NA= not analyzed
Bold and italics indicates the MDL exceeded the GWOS.
Shaded indicates concentrations exceeding GWQS.
Chloride
No GWQS (mq/L)
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
293
318
307
301
290
281
292
293
289
258
282
295
272
279
286
307
310
301
Nitrate, Nitrate+ Nitrite
(10 mq/L)
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
11.00
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
9.7E
10.E
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 1st Quarter 2022
Chloroform Contamination Investigation
DUSA White Mesa Mill
TW4-21 Parameter
(chloroform pumping well 6/9/15)
(GWQS)
Sampling Event Carbon Tetrachloride Chloroform Chloromethane Methylene Chloride
(5 ~g/Ll (70 ~g/L) (30 ~g/Ll (5 ~g/Ll
1stQtr 3/16/2005 Monitor well was not installed
2nd Qtr 5/25/2005 NA 192 NA NA
3rd Qtr 8/31/2005 <5.0 78 <5.0 <5.0
4th Qtr 12/7/2005 <1.0 86 <1.0 <1.0
1stQtr 3/9/2006 <2.5 120 <2.5 <2.5
2nd Qtr 6/14/2006 <2.5 120 <2.5 <2.5
3rdQtr 7/20/2006 <2.5 108 <2.5 <2.5
4th Qtr 11/8/2006 2 139 <1.0 <1.0
1stQtr 2/2812007 1.8 160 <1.0 <1.0
2nd Qtr 6/27/2007 5.8 300 <1.0 <1.0
3rdQtr 8/15/2007 <1.0 140 <1.0 <1.0
4th Qtr 10/10/2007 <1.0 120 <1.0 <1.0
1stQtr 3/28/2008 7 390 <1.0 <1.0
2nd Qtr 6/25/2008 1.7 180 <1.0 <1.0
3rdQtr 9/10/2008 1.6 120 <1.0 <1.0
4th Qtr 10/15/2008 NA #N/A NA NA
11/18/2008 2 170 <2.0 <2.0
1stQtr 3/11/2009 <1.0 180 <1.0 <1.0
2nd Qtr 6/23/2009 <1.0 200 <1.0 <1.0
3rdQtr 9/14/2009 <1.0 200 <1.0 <1.0
4th Qtr 12/22/2009 <1.0 160 <1.0 <1.0
1stQtr 2/25/2010 <1.0 170 <1.0 <1.0
2nd Qtr 6/14/2010 <1.0 210 <1.0 <1.0
3rdQtr 8/13/2010 9.2 390 <1.0 <1.0
4th Qtr 10/15/2010 1.2 200 <1.0 <1.0
1stQtr 2/22/2011 1.2 230 <1.0 <1.0
2nd Qtr 6/28/2011 4.8 290 <1.0 <1.0
3rdQtr 8/17/2011 6.3 460 <1.0 <1.0
4th Qtr 11/16/2011
fsfQfr &,i ;~~~;~ 6.7 390 <1.0 <1.0
6.4 420 <1.0 <1.0 ------------------!------------------2nd Qtr 6/6/2012 5.4 400 <1.0 <1.0
3rdQtr 9/4/2012 6 410 <1.0 <1.0
4thQtr 10/3/2012 7 390 <1.0 <1.0
1stQtr 2/11/2013 5.25 282 <1.0 <1.0
2ndQtr 6/5/2013 3.49 328 <1.0 <1.0
3rd Qtr 9/3/2013 2.13 244 <1.0 <1.0
4thQtr 10/29/2013 <1.0 204 <1.0 <1.0
1stQtr 1/27/2014 6.23 220 <1.0 2.04
2ndQtr 5/19/2014 4.73 240 <1.0 2.04
3rd Qtr 8/11/2014 <1.0 204 <1.0 <1.0
4thQtr 10/21/2014 1.04 229 <1 .0 <1.0
1stQtr 3/9/2015 1.75 292 <1.0 <1.0
2nd Qtr (3) 6/8/2015 1.92 366 <1.0 <1.0 ~------3rd Qtr 8/31/2015 <1.0 281 <1.0 <1.0
4th Qtr 10/19/2015 <1.0 339 <1.0 <1.0
1stQtr 3/9/2016 <1.0 390 <1.0 <1.0
2nd Qtr 5/23/2016 <1.0 545 <1.0 <1.0
3rdQtr 7/25/2016 <1.0 456 <1.0 <1.0
4th Qtr 10/12/2016 <1.0 456 <1.0 <1.0
1stQtr 3/8/2017 2.36 598 <1.0 <1.0
2nd Qtr 6/13/2017 1.16 224 <1.0 <1.0
3rdQtr 7/26/2017 105 537 <1.0 <1.0
4thQtr 10/11/2017 <1.0 466 <1.0 <1.0
OWMRC snlit sam le <3.8 400 <6.0 14 J
1stQtr 3/12/2018 2.36 421 <1 .0 <1.0
2nd Qtr 6/8/2018 <1.0 532 <1 .0 <1.0
3rdQtr 8/22/2018 <1.0 476 <1 .0 <1.0
4thQtr 10/22/2018 <1.0 585 <1 .0 <1.0
1stQtr 3/8/2019 <1.0 323 <1.0 <1.0
2nd Qtr 6/5/2019 <1.0 734 <1.0 <1.0
3rdQtr 9/4/2019 <1.0 596 <1 .0 <1.0
4thQtr 12/10/2019 <1.0 794 <1 .0 <1.0
1stQtr 2/19/2020 <1.0 844 2.58 <1.0
2ndQtr 5/27/2020 <1.0 767 <1 .0 <1.0
3rd Qtr 9/4/2020 <1.0 920 <1 .0 <1.0
4thQtr 10/28/2020 <1.0 948 <1.0 <1.0
1stQtr 2/23/2021 <1.0 400 <1.0 <1.0
2ndQtr 6/9/2021 <1.0 1,130 <1.0 <1.0
3rd Qtr 8/24/2021 <1.0 669 <1 .0 <1.0
4thQtr 12/1/2021 <1.0 649 <1.0 <1.0
1stQtr 3/9/2022 <1.0 469 <1.0 <1.0
(1) VOCs were resampled because laboratory m1SSed holding time. (2) As of March 2012 both north and south wild life ponds no longer receiving water .
. ,Pl.C.!!l~o~~m pumping well started 6/9/15.
NA "' not analyzed
Shaded indicates concentrations exceeding GWQS.
J = Approximated value
Chloride
No GWQS (mg/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
Nitrate, Nitrate + Nitrite
(10 mg/Ll
14.6
10.1
9.6
8.5
10.2
8.9
8.
8.
8.E
8.E
8.3
14.3
8.8
7.57
8.0
#N/A
8.3
8.1
9.2
8.4
8.4
12.0
14.0
7.0
9.0
120
14.0
13.0
15.6 ------1Tb
13.0
14.0
11.8
13.8
10.3
9.0
11.4
11.5
7.1
10.0
10.9
13.1
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
8.99
17.5
14.7
5.73
8.93
15.4
12.6
16.3
15.20
21 .5
12.9
17.2
2.2
TABLE 1 (23 of 33)
Historic Summary Of Monitoring Well Analytical Results Up To The 1st Quarter 2022
Chloroform Contamination Investigation
DUSA White Mesa Mill
I YV~·ZZ Parameter
(nitrate pumping well started (GWQS)
1/26/13)
Sampling Event Carbon Tetrachloride Chloroform Chloromethane Methylene Chloride
(5 µg/L) (70 µg/L) (30 µg/L) (5 µg/L)
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
4thOtr 12nt2005 <5.0 320 <5.0 <5.0
1stQtr 3/9/2006 <10 390 <10 <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
1stQtr 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
1stOtr 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
1stOtr 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
4th Qtr 10/15/2010 <1.0 340 <1.0 <1.0
1stOtr 2/22/2011 1.2 1,300 <1 .0 <1.0
2ndQtr 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
1,10:tr~f ltfg§§H <1.0 400 <1.0 <1.0
<1.0 200 <1.0 <1.0 ~---------------------------2nd Qtr 6/13/2012 <1.0 1201<1 0 <1.0
3rd Qtr 9/12/2012 <1.0 121 <1.0 <1.0
4th Qtr 10/4/2012 <1 .0 -----330 <1.0 ------<1.0
1stQtr(3) 2/11/2013 t-,----------3.24 10,600 <1.0 <1.0
2nd Qtr 6/5/2013 3.35 12,500 <1.0 <1.0
3rdQtr 9/3/2013 3.25 9,640 <1.0 <1.0
4th Qtr 10/29/2013 809 13 300 <1.0 <1.0
1stQtr 1/27/2014 6.06 12,100 <1.0 2.83
2nd Qtr 5/19/2014 6.65 12,400 <1.0 <1.0
3rdQtr 8/11/2014 1.9 12,400 40 <1.0
4th Qtr 10/29/2014 3.32 12 400 1.61 <1.0
1stQtr 3/9/2015 3.77 12,700 4.31 <1.0
2nd Qtr 6/8/2015 2.42 8,050 3.42 <1.0
3rdQtr 8/31/2015 <1.0 7,810 5.47 <1.0
4th Qtr 10/19/2015 3.32 7 530 5.1 <1.0
1stOtr 3/9/2016 <1 .0 6,070 <1.0 <1.0
2nd Qtr 5/23/2016 2.64 8,570 <1.0 <1.0
3rdQtr 7/25/2016 <1 .0 5,840 <1.0 <1.0
4th Qtr 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
3rdQtr 7/26/2017 <1 .0 5,150 <1.0 <1.0
4th Qtr 10/11/2017 <1.0 4,770 <1.0 <1.0
OWMRC Slllit sample <38 4100 <60 150 J
1stQtr 3/12/2018 <1.0 4,530 <1.0 <1.0
2nd Qtr 6/8/2018 <1.0 3,010 <1.0 <1.0
3rdQtr 8/22/2018 <1.0 3,600 <1.0 <1.0
4th Qtr 11/28/2018 <1 .0 2 680 <1.0 <1.0
1stQtr 3/8/2019 1 02 4,310 <1.0 <1.0
2nd Qtr 6/5/2019 1.13 4,690 <1.0 <1.0
3rdQtr 9/4/2019 <1.0 3,460 <1.0 <1.0
4th Qtr 12/10/2019 <1 .0 3820 <1.0 <1.0
1stQtr 2/19/2020 1.02 3,910 <1.0 <1.0
2nd Qtr 5127/2020 <1 .0 2,530 <1.0 <1.0
3rdQtr 9/4/2020 <1.0 3,760 <1.0 <1.0
4th Qtr 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
3rdQtr 8/24/2021 <1.0 3,510 <1.0 <1 .0
4th Qtr 12/1/2021 <1.0 3 330 <1.0 <1.0
1stQtr 3/9/2022 <1 .0 3 320 <1.0 <1.0
(1) VOCs were resampled because laboratory mtssed holding time.
(2) As of March 2012 both north and south wild life ponds no longer receiving water. ______ .
• PlChloroform.e,umpmg.,weU started 1126/13. ______ _
NA = not analyzed
Shaded indicates concentrations exceeding GWQS.
Bold and italics indicates the MDL exceeded the GWOS.
J = Approximated value
Chloride
No GWQS (mg/L)
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
Nitrate, Nitrate + Nitrite
(10 mg/L)
18.2
15.7
15.1
15.3
14.3
14.5
15.9
20.9
19.3
19.3
18.
39.
41 .
38.
36. #N/A
20.
20.1
40.
17.
36.
19.0
15.0
16.0
18.0
17.0
15.0
19.0
#N/A
14.0
12.8
7.0
14.0
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.
70.
66.
80.
79.
62.
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
TW4-23
Sampling Event
TABLE 1 (24 of 33)
Historic Summary Of Monitoring Well Analytical Results Up To The 1st Quarter 2022
Chloroform Contamination Investigation
DUSA White Mesa Mill
Parameter
(GWQSl
Carbon Tetrachloride Chloroform Chloromethane Methylene Chloride Chloride Nitrate, Nitrate + Nitrite
(5 µg/L) (70 µg/L)
2nd Qtr 6/27/2007 <1 .0 <1.0 <1.0
3rd Qtr 8/15/2007 <1.0 <1.0 <1.0
41hQtr 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
4thQtr 10/15/2008 NA NA NA
11/18/2008 <2.0 <2.0 <2.0
11s!Qtr 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
4th 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
2nd Qtr 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 lsfQ!i(f) 1/17/2012 <1.0 <1.0 <1 .0
2nd Qtr 5/31/2012 <1.0 ;-------<1 .0 <1.0
3rdQtr 8/29/2012 <1.0 <1.0 <1.0
4th Qtr 10/3/2012 <1.0 <1.0 <1.0
1stQtr 217/2013 <1.0 <1.0 <1 .0
2nd Qtr 5/30/2013 <1.0 <1.0 <1.0
3rd Qtr 9/5/2013 <1.0 <1 .0 <1.0
4th Qtr 11/7/2013 <1.0 <1 .0 <1.0
1stQtr 1/23/2014 <1.0 <1 .0 <1 .0
2nd Qtr 5/19/2014 <1.0 <1.0 <1.0
3rd Qtr 8/13/2014 <1.0 <1.0 <1 .0
4th Qtr 10/28/2014 <1.0 <1 .0 <1.0
1stQtr 3/12/2015 <1.0 <1.0 <1.0
2ndQtr 6/8/2015 <1.0 <1 .0 <1 .0
3rd Qtr 9/3/2015 <1.0 <1.0 <1.0
4thQtr 10/28/2015 <1.0 <1.0 <1.0
Duplicate lW4-70 <1.0 <1.0 <1.0
r•tQtr 3/16/2016 <1.0 <1.0 <1.0
2nd Qtr 5/26/2016 <1.0 <1 .0 <1.0
3rd Qtr 8/23/2016 <1.0 <1.0 <1.0
Duplicate lW4-70 <1.0 <1.0 <1.0
114thQtr 10/12/2016 <1.0 <1 .0 <1.0
111s!Qtr 3/15/2017 <1.0 <1.0 <1.0
Duplicate TW4-70 <1.0 <1.0 <1.0
112ndQtr 6/15/2017 <1.0 <1.0 <1.0
3rd Qtr 8/2/2017 <1.0 <1.0 <1.0
4th Qtr 10/10/2017 <1.0 <1 .0 <2.0
DWMRC split sample <1.0 <1.0 <2.0
111stQtr 3/14/2018 <1.0 <1.0 <1.0
2ndQtr 6/13/2018 <1.0 <1 .0 <1.0
Duplicate TW4-70 <1.0 <1.0 <1.0
3rd Qtr 8/30/2018 <1.0 <1.0 <1.0
4thQtr 12/12/2018 <1.0 <1.0 <1.0
1stQtr 3/16/2019 <1.0 <1 .0 <1.0
2nd Qtr 6/13/2019 <1.0 <1.0 <1.0
3rd Qtr 9/11/2019 <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
2nd Qtr 6/16/2021 <1.0 <1 .0 <1.0
3rdQtr 9/15/2021 <1.0 <1.0 <1.0
4th Qtr 12/8/2021 <1.0 <1 .0 <1.0
Ouolicate TW4-70 <1.0 <1 .0 <1.0
i'stQtr 3/22/2022 <1.0 <1 .0 <1.0
Duolicate TW4-70 <1.0 <1 .0 <1.0
(1) As of March 2012 both north and south wild hfe ponds no longer receiving water.
NA = not analyzed
Shaded indicates concentrations exceeding GWQS.
J = Approximated value.
(30 µg/L) (5 µQ/Ll No GWQS (mQ/Ll (10 mQ/Ll
<1.0 47 <0.1
<1.0 46 <0.1
<1.0 43 <0.1
<1.0 41 <0.1
<1.0 41 <0.1
<1.0 35 <0.05
NA 51 <0.05
<2.0 NA NA
<1.0 41 <0.1
<1.0 43 <0.1
<1.0 43 <0.1
<1.0 37 <0.1
<1.0 45 <0.1
<1.0 40 <0.1
<1.0 40 <0.1
<1.0 34 <0.1
<1.0 44 <0.1
<1.0 44 <0.1
<1.0 41 <0.1
<1.0 43 <0.1
<1.0 40 <0.1 1-----------<1.0 ---------44 <0.1
<1.0 46 <0.1
<1.0 45 <0.1
<1.0 43.6 <0.1
<1.0 44.7 0.1
<1.0 48 <0.1
<1.0 43 <0.1
<1.0 44.6 <0.1
<1.0 42.3 <0.1
<1.0 46 <0.1
<1.0 46.8 <0.1
<1.0 47.3 <0.1
<1.0 48.4 <0.1
<1.0 54.1 <0.1
<1.0 46.4 <0.1
<1.0 46.4 <0.1
<1.0 49.1 <0.1
<1.0 50.4 <0.1
<1.0 49.6 <0.1
<1.0 48.3 <0.1
<1.0 52.1 <0.1
<1.0 47.7 <0.1
<1.0 49.8 <0.1
<1.0 51.5 <0.1
<1.0 51.8 <0.1
<2.0 44.7 <0.1
<2.0 52 <0.1
<1.0 53.8 <0.1
<1.0 47.6 <0.1
<1.0 47.9 <0.1
<1.0 56 <0.1
<1.0 54.9 <0.1
<1.0 48.9 <0.1
<1.0 50.2 <0.1
<1.0 47.9 <0.1
<1.0 54.4 <0.1
<1.0 50.0 <0.1
<1.0 49.0 <0.1
<1.0 48.8 <0.1
<1.0 49.3 <0.1
<1.0 51.6 <0.1
<1.0 48.8 <0.1
<1.0 42.8 <0.1
<1.0 51.2 <0.1
<1.0 53.2 <0.1
<1.0 43.8 <0.1
<1.0 39.2 <0.1
TABLE 1 (25 of 33)
Historic Summary Of Monitoring Well Analytical Results Up To The 1st Quarter 2022
Chloroform Contamination Investigation
OUSA White Mesa Mill
TW4-24
(nitrate pumping well started
1/26/13)
Sampling Event Carbon Tetrachloride Chloroform Chloromethane
15 ua/Ll 170 ua/Ll 130 ua/Ll
2nd Qtr 6127/2007 <1.0 2.6 <1.0
3rdQtr 8/15/2007 <1.0 2.2 <1.0
4th Qtr 10/10/2007 <1.0 1.5 <1.0
1stQtr 3/28/2008 <1.0 1.5 <1.0
2nd Qtr 6/25/2008 <1.0 1.4 <1.0
3rdQtr 9/10/2008 <1.0 2.9 <1.0
4th Qtr 10/15/2008 NA #N/A NA
11/18/2008 <2.0 <2.0 <2.0
1stQtr 3/4/2009 <1.0 1.4 <1.0
2ndQtr 6/23/2009 <1.0 1.5 <1.0
3rd Qtr 9/14/2009 <1.0 1.4 <1.0
4thQtr 12/16/2009 <1.0 1.2 <1 .0
1stQtr 3/25/2010 <1.0 1.3 <1.0
2ndQtr 6/14/2010 <1.0 1.7 <1.0
3rd Otr 8/24/2010 <1.0 1.8 <1.0
4thQtr 10/15/2010 <1.0 1.4 <1.0
1stQtr 2/16/2011 <1.0 1.8 <1.0
2nd Qtr 6/14/2011 <1.0 1.1 <1.0
3rdQtr 8/16/2011 <1.0 1.7 <1.0
4th Qtr 11/15/2011 NA #N/A NA
1srarrBi ;;1~!~~;i
<1.0 1.2 <1.0
<1.0 <1.0 <1.0 2nd Qtr _____ 6/6/2012 <1.0 ---------1<1.0 ----1<1.0 ------
3rd Qtr 8/30/2012 <1.0 <1.0 <1.0
4th Qtr 10/3/2012 <1.0 1 <1.0
1st Qtr (3) 2/11/2013 <1.0 1 <1.0 -----
2nd Qtr 6/5/2013 <1.0 17.4 <1.0
3rdQtr 8/30/2013 <1.0 21.8 <1.0
4th Qtr 10/29/2013 <1.0 32.5 <1 .0
1stQtr 1/27/2014 1.18 78.5 <1.0
2nd Qtr 5/19/2014 <1.0 62.7 <1.0
3rd Qtr 8/11/2014 <1.0 76.3 <1.0
4th Qtr 10/21/2014 <1.0 25.8 <1.0
1stQtr 3/9/2015 <1.0 49.2 <1.0
2nd Qtr 6/8/2015 <1.0 4.28 <1.0
3rd Qtr 8/31/2015 <1.0 46.9 <1.0
4th Qtr 10/19/2015 <1.0 25.3 <1.0
1stQtr 3/9/2016 <1.0 22.8 <1.0
2ndQtr 5/23/2016 <1.0 69.6 <1.0
3rd Qtr 7/25/2016 <1.0 17.8 <1.0
4th Qtr 10/12/2016 <1.0 20.8 <1.0
1stQtr 3/8/2017 <1.0 18.3 <1.0
2nd Qtr 6/13/2017 <1.0 17.2 <1.0
3rd Qtr 7/26/2017 <1.0 17.8 <1.0
4th Qtr 10/11/2017 <1.0 16.0 <1.0
DWMRC solit samole <0.38 36.0 <0.60
1stQtr 3/16/2018 <1.0 24.9 <1.0
2nd Qtr 6/14/2018 <1.0 49.2 <1.0
3rd Qtr 8/22/2018 <1.0 35 <1.0
4th Qtr 11/28/2018 <1.0 21 <1.0
DWMRC solit samole <5.0 60 <5.0
1stQtr 3/8/2019 <1.0 28.1 <1.0
2nd Qtr 6/5/2019 <1.0 28.8 <1.0
3rdQtr 9/4/2019 <1.0 31.1 <1.0
4thQtr 12/10/2019 <1.0 43.3 <1.0
1stQtr 2/19/2020 <1.0 61.7 <1.0
2nd Qtr 5/27/2020 <1.0 49.4 <1.0
3rdQtr 9/4/2020 <1.0 63.8 <1.0
4thQtr 10/28/2020 <1.0 72.6 <1.0
1stQtr 2/23/2021 <1.0 96.2 3.6
2nd Qtr 6/9/2021 <1.0 41.9 <1.0
3rdQtr 8/26/2021 <1.0 103 <1.0
4th Qtr 12/1/2021 <1.0 112 <1.0
1stQtr 3/9/2022 <1.0 114 <1.0
(1) VOCs were resampled because laboratory missed holding time.
(2) As of March 2012 both north and south wild lrfe ponds no longer receiving water.
131 Chloroform .e,umpini_ well started 1126/13. ______ _
NA = not analyzed
Shaded indicates concentrations exceeding GWQS.
J = Approximated value
Parameter
(GWQS)
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
NA
<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
1.3 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
<1.0
Chloride
No GWQS lma/Ll
770
791
692
740
834
1,180
1,130
#NIA
1,010
759
618
1 080
896
639
587
522
1,100
1,110
967
608
#N/A
373 --------355
489
405
-------1,260
916
998
1 030
809
1,020
1,150
1 050
944
1,290
788
909
989
771
1,180
1 010
1,090
1,080
1,230
895
1100
1,320
792
996
1,100
1 000
1,040
1,020
1,130
1 090
1,010
1,060
1,100
1 050
1,170
938
1,010
1140
980
Nitrate, Nitrate+ Nitrite
(10 mg/L)
26.1
29
24.7
24.4
45.3
38.4
44.8
#N/A
30.5
30.4
30.7
28.3
33.1
30
31
31
31
35
34
35
#N/A
37 -----------37
37
38
35.9
23.7
33
35
31 .6
35.0
31.5
35.7
34.6
31.8
25.3
29.6
29.1
24.2
34.4
31.9
41.3
39.9
40.0
31.7
32.0
44.9
33.6
33.8
38.4
34.0
39.3
33.2
36.4
33.8
37.1
41.7
39.1
35.9
41.9
48.0
26.7
43.6
36.2
II
TW4-25
(nitrate pumping well started
1126113)
Sampling Event
2nd Qtr 6/27/2007
3rdQtr 8/15/2007
4th Qtr 10/10/2007
1stQtr 3/28/2008
2nd Qtr 6/25/2008
3rdQtr 9/10/2008
4th Qtr 10/15/2008
11/18/2008
1stQtr 3/4/2009
2nd Qtr 6/23/2009
3rdQtr 9/14/2009
4thQtr 12/16/2009
1stQtr 3/23/2010
2nd Qtr 6/14/2010
3rd Qtr 8/10/2010
4thQtr 10/15/2010
1stQtr 2/16/2011
2ndQtr 5/25/2011
3rd Qtr 8/16/2011
4thQtr 11/15/2011
Tsf"Qff('21 . _ 1/16/2012
2nd Qtr 5/31/2012
3rd Qtr 9/4/2012
4th Qtr 10/3/2012
1st Qtr (3) 2/1112013
2ndQtr 6/5/2013
3rd Qtr 9/4/2013
4thQtr 10/31/2013
1st Qtr 1/27/2014
2ndQtr 5/19/2014
3rd Qtr 8/11/2014
4th Qtr 10/21/2014
1stQtr 3/9/2015
2nd Qtr 6/8/2015
3rdQtr 8/31/2015
4th Qtr 10/19/2015
1st Qtr 3/9/2016
2nd Qtr 5/23/2016
3rdQtr 7/25/2016
4th Qtr 10/12/2016
1stQtr 3/8/2017
2nd Qtr 6/13/2017
3rdQtr 7/26/2017
4thQtr 10/11/2017
1st Qtr 3/12/2018
2ndQtr 6/14/2018
3rd Qtr 8/22/2018
4thQtr 11/28/2018
1st Qtr 3/8/2019
2ndQtr 6/5/2019
3rd Qtr 9/4/2019
4thQtr 12/10/2019
1st Qtr 2/19/2020
2ndQtr 512712020
3rd Qtr 9/4/2020
4th Qtr 10/28/2020
1stQtr 2/23/2021
2nd Qtr 6/9/2021
3rdQtr 8/26/2021
mi 12/1/2021
3/9/2022
TABLE 1 (26 of 33)
Historic Summary Of Monitoring Well Analytical Results Up To The 1st Quarter 2022
Chlorofonn Contamination Investigation
DUSA White Mesa Mill
Parameter
(GWQS)
Carbon Tetrachloride Chlorofonn Chloromethane Methylene Chloride Chloride
(5 ua/Ll 170 ua/Ll 130 ua/Ll 15 ua/LI No GWQS lma/Ll
<1.0 <1.0 <1.0 <1 .0 395
<1.0 2.2 <1 .0 <1.0 382
<1.0 <1.0 <1.0 <1.0 358
<1.0 <1.0 <1.0 <1.0 374
<1.0 <1.0 <1.0 <1.0 344
<1.0 <1.0 <1.0 <1 .0 333
NA #N/A NA NA 366
<2.0 <2.0 <2.0 <2.0 #NIA
<1.0 <1.0 <1.0 <1 .0 3
<1.0 <1.0 <1.0 <1.0 328
<1.0 <1.0 <1.0 <1 .0 328
<1.0 <1.0 <1.0 <1.0 371
<1.0 <1.0 <1.0 <1.0 296
<1.0 <1.0 <1.0 <1.0 306
<1.0 <1.0 <1.0 <1.0 250
<1.0 <1.0 <1.0 <1 .0 312
<1.0 1.8 <1.0 <1.0 315
<1.0 <1.0 <1.0 <1.0 321
<1.0 <1.0 <1.0 <1.0 276
<1 .0 <1.0 <1.0 <1.0 294
<1 .0 <1.0 <1.0 <1.0 304
<1 .0 ---------~---------------"::10 --------287 <1.0 1<1.0
<1.0 <1.0 <1 .0 <1.0 334
<1 .0 ~1.0 ----~1.0 ------~1.0 --------338
<1.0 ---------<1.0 <1.0 <1.0 --------190
<1 .0 <1.0 <1.0 <1.0 136
<1.0 <1.0 <1.0 <1.0 119
<1.0 <1.0 <1.0 <1.0 88.6
<1.0 <1.0 <1.0 <1.0 85.7
<1.0 <1.0 <1.0 <1.0 51.1
<1.0 <1.0 <1.0 <1.0 67
<1.0 <1.0 <1.0 <1.0 58.1 ....
<1.0 <1.0 <1.0 <1.0 310
<1.0 <1.0 <1.0 <1.0 58.3
<1.0 <1.0 <1.0 <1.0 69.2
<1.0 <1.0 <1.0 <1.0 93.7
<1.0 <1.0 <1.0 <1.0 62.7
<1.0 <1.0 <1.0 <1.0 75.5
<1.0 <1.0 <1.0 <1.0 74.1
<1.0 <1.0 <1.0 <1.0 59.8 ..... <1 .0 1.15 <1.0 <1.0 285
<1.0 <1.0 <1.0 <1.0 69.8
<1.0 <1.0 <1.0 <1.0 70.1
<1.0 <1.0 <1.0 <1.0 68.0
<1.0 1.15 <1.0 <1.0 70.5
<1.0 <1.0 <1.0 <1.0 60.3
<1.0 <1.0 <1.0 <1.0 69.1
<1.0 <1.0 <1.0 <1.0 59.7
<1.0 <1.0 <1.0 <1.0 65
<1 .0 <1.0 <1.0 <1.0 59
<1.0 <1.0 <1.0 <1.0 58.1
<1.0 <1.0 <1.0 <1.0 73.1
<1.0 <1.0 <1.0 <1.0 86.0
<1.0 <1.0 <1.0 <1.0 76.8
<1.0 <1.0 <1.0 <1.0 67.3
<1.0 <1.0 <1.0 <1.0 61 .3
<1.0 <1.0 <1.0 <1.0 100
<1.0 <1.0 <1.0 <1.0 55.1
<1.0 <1.0 1.34 <1.0 69.3
<1.0 <1.0 <1.0 <1.0 93.7
<1.0 <1.0 <1.0 <1.0 70.3
(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 .
. Pl.Chloroform_flJJT'\Pina.,weUstarted 1126/13. ______ _
NA = not analyzed
Shaded indicates concentrations exceeding GWQS.
Nitrate, Nitrate + Nitrite
110 ma/L\
17.1
29
17
18.7
22.1
18.8
21.3
#N/A
15.3
15.3
3.3
14.2
14.4
16
14
15
15
16
16
16
16 --------· --,6
17
17
904
5.24
5.69
" 2.1
1.2
1.
1.0
14.
1.1
1.6
1.7
0.837
0.959
1.78
1.24
17.0
0.976
1;; 1.
2.2,
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
0.97f
1.8
TABLE 1 (27 of 33)
Historic Summary Of Monitoring Well Analytical Results Up To The 1st Quarter 2022
Chloroform Contamination Investigation
TW4-26
Sampling Event
Parameter
IGWQSl
DUSA White Mesa Mill
Carbon Tetrachloride Chloroform Chloromethane Methylene Chloride
15 ua/Ll 170 ua/Ll 130 ua/Ll 15 ua/Ll
2nd Qtr 6/14/2010 <1 .0 13 <1.0
3rd Qtr 8/24/201 O <1 .0 5.2 <1.0
4th Qtr 10/15/2010 <1.0 5.4 <1.0
1stQtr 2/16/2011 <1.0 2 <1.0
2nd Qtr 5/26/2011 <1 .0 2.9 <1.0
3rd Qtr 8/17/2011 <1 .0 2.8 <1.0
4th Qtr 11/16/2011 NA #N/A NA
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
NA
{1l 1217/2011 <1.0 5.2 <1.0 <1.0 1statn 2~,--,cc,c-:,8""12ccocc1-=2+-<..;1c'c.oc-------+-----"'-ii <1.0 <1.0
2ndQtr 6/6/2012 <1.0 -----·:r1 <1.0 ------'<fa _______ _
3rd Qtr 9/11/2012 <1 .0 4.9 <1 .0 <1.0
4th Qtr 10/3/2012 <1 .0 4.9 <1.0 <1.0
1stQtr 2/11/2013 <1 .0 4.9 <1 .0 <1.0
2nd Qtr 6/13/2013 <1.0 2.12 <1.0 <1.0
3rd Qtr 9/5/2013 <1 .0 2.81 <1.0 <1.0
4th Qtr 11/7/2013 <1.0 3.37 <1.0 <1.0
1stQtr 1/29/2014 <1.0 1.43 <1.0 <1.0
2nd Qtr 5/21/2014 <1 .0 4.23 <1 .0 <1.0
3rd Qtr 8/11/2014 <1.0 1.3 <1.0 <1.0
4th Qtr 10/28/2014 <1.0 2.45 <1.0 <1.0
1stQtr 3/12/2015 <1 .0 2.37 <1 .0 <1.0
2nd Qtr 6/10/2015 <1.0 6.12 1.17 <1.0
3rd Qtr 9/3/2015 <1 .0 4.77 <1 .0 <1.0
4th Qtr 10/28/2015 <1.0 3.45 <1.0 <1.0
1stQtr 3/16/2016 <1 .0 1.8 <1.0 <1.0
2nd Qtr 5/26/2016 <1 .0 8.23 <1 .0 <1.0
3rd Qtr 8/3/2016 <1.0 4.42 <1.0 <1.0
4th Qtr 10/20/2016 <1 .0 19.9 <1.0 <1.0
1stQtr 3/16/2017 <1 .0 46.1 <1 .0 <1.0
2nd Qtr 6/20/2017 <1.0 244 <1.0 <1.0
3rd Qtr 8/3/2017 <1 .0 419 <1.0 <1.0
4th Qtr 10/11/2017 <1 .0 608 <1.0 <1.0
1stQtr 3/21/2018 <1 .0 1,050 <1 .0 <1.0
2nd Qtr 6/14/2018 <1.0 960 <1.0 <1.0
3rd Qtr 9/6/2018 <1 .0 916 <1.0 <1.0
4th Qtr 12/13/2018 <1.0 1 050 <1.0 <1.0
1stQtr 3/20/2019 <1 .0 963 <1.0 <1.0
2nd Qtr 6/5/2019 <1 .0 1,070 <1.0 <1.0
3rd Qtr 9/12/2019 <1 .0 877 <1.0 <1.0
4th Qtr 12/18/2019 <1.0 1 070 <1.0 <1.0
1stQtr 3/18/2020 <1.0 1,090 <1.0 <1.0
2nd Qtr 6/12/2020 <1 .0 1,140 <1.0 <1.0
3rdQtr 9/19/2020 <1.0 1120 <1.0 <1.0
4th Qtr 11/11/2020 <1.0 1 160 <1.0 <1.0
1stQtr 3/24/2021 <1 .0 1,030 <1.0 <1.0
2nd Qtr 6/17/2021 <1.0 1,020 <1.0 <1.0
3rd Qtr 9/23/2021 <1.0 927 <1.0 <1.0
4th Qtr 12/9/2021 <1 .0 993 <1.0 <1.0
1stQtr 3/24/2022 <1 .0 952 2.4 <1.0
TW4-27
'fsfQti'{2J 1/18/2012 <1 .0 ------9 _::1.0 ______ .:::1.0 --------
2nd Qtr 6/13/2012 <1 .0 <1.0 <1.0 <1.0
3rd Qtr 9/4/2012 <1 .0 <1.0 <1.0 <1.0
4th Qtr 10/3/2012 <1 .0 <1.0 <1.0 <1.0
1st Qtr 217/2013 <1 .0 <1.0 <1.0 <1.0
2nd Qtr 6/13/2013 <1.0 <1.0 <1.0 <1.0
3rd Qtr 8/30/2013 <1 .0 <1.0 <1.0 <1.0
4th Qtr 11/6/2013 <1.0 <1.0 <1.0 <1.0
1stQtr 1/23/2014 <1.0 <1.0 <1.0 <1.0
2nd Qtr 5/21/2014 <1 .0 <1.0 <1.0 <1.0
3rd Qtr 8/13/2014 <1.0 <1.0 <1.0 <1.0
4th Qtr 10/28/2014 <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 9/2/2015 <1 .0 1.3 <1.0 <1.0
4th Qtr 10/28/2015 <1.0 1.6 <1.0 <1.0
1stQtr 3/16/2016 <1.0 2.11 <1.0 <1.0
2nd Qtr 5/26/2016 <1.0 3.16 <1.0 <1.0
3rd Qtr 8/3/2016 <1.0 2.78 <1.0 <1.0
4th Qtr 10/20/2016 <1.0 3.8 <1.0 <1.0
1stQtr 3/15/2017 <1.0 4.33 <1.0 <1.0
2nd Qtr 6/15/2017 <1 .0 5.65 <1.0 <1.0
3rd Qtr 8/2/2017 <1.0 6.05 <1.0 <1.0
4th Qtr 10/10/2017 <1 .0 5.91 <1.0 <1.0
1stQtr 3/14/2018 <1 .0 6.95 <1.0 <1.0
2nd Qtr 6/13/2018 <1.0 5.95 <1.0 <1.0
3rd Qtr 8/30/2018 <1.0 7.35 <1.0 <1.0
4th Qtr 12/12/2018 <1.0 7.7 <1.0 <1.0
1st Qtr 3/16/2019 <1 .0 6.54 <1.0 <1.0
2nd Qtr 6/13/2019 <1 .0 8.24 <1.0 <1.0
3rd Qtr 9/11/2019 <1 .0 7.58 <1.0 <1.0
4th Qtr 12/14/2019 <1 .0 7.97 <1 .0 <1.0
1stQtr 3/18/2020 <1 .0 8.04 <1 .0 <1.0
2nd Qtr 6/11/2020 <1.0 7.92 <1.0 <1.0
3rd Qtr 9/18/2020 <1.0 5.62 <1.0 <1.0
4th Qtr 11/4/2020 <1 .0 7.8 <1.0 <1.0
1stQtr 3/18/2021 <1 .0 4.66 <1.0 <1.0
2nd Qtr 6/17/2021 <1 .0 4.26 <1.0 <1.0
3rd Qtr 9/15/2021 <1 .0 3.81 <1.0 <1.0
4th Qtr 12/8/2021 <1.0 4.08 <1.0 <1.0
1st Qtr 3/23/2022 <1.0 3.3 <1.0 <1.0
(1) VOCs were resamp1ed because laboratory missed holding time.
(2) As of March 2012 both north and south wild life ponds no longer receiving water. ------·
NA :: not analyzed
Shaded indicates concentratiom; exceeding GWOS.
Chloride
No GWQS lma/Ll
Nitrate, Nitrate + Nitrite
110 ma/Ll
#N/A
33
17
22
30
15
19
26
#N/A
17 ---------19 -
19
19
16.6
14.5
17.6
15.9
16.9
15.4
15
14.6
14.4
14.4
14
13.3
13.7
15.2
13.9
14.2
16.2
19
25.8
27.3
35.5
33.5
38.9
33.4
32.9
35.8
32.0
38.3
36.3
35.1
34.8
36.3
38.9
34
36.5
34.9
33.0
11 ---------17
21
18
18.8
20.3
19
21.8
31.8
20.6
23
24.4
26.2
26.8
26.8
26.2
28
21.2
27.1
29.4
28.3
27.9
29.5
26.3
30.3
28.3
31.4
28.2
26.2
28.6
25.3
27.4
27.6
28.0
26.2
26.8
27.5
25.8
21.7
26.4
22.7
7.9
9.0
9.6
10.0
10.0
11.0
10.0
11.0
12-:-0
9.0
12.0
12.5
13.6
11.7
15.9
14.2
12.5
10.8
12.3
14.4
11.3
14.2
13.9
16.9
13.9
17.9
15.0
15.8
15.2
15.2
10.0
12.2
13.2
13.5
11.8
12.2
12.6
10.9
10.3
11.9
11.1
10.5
11.9
11.3
14.2
12.1
8.15
10.9
24.0 --4fo
37.0
36.0
31 .2
29.4
27.2
29.8
31 .3
31 .1
27.0
28.2
26.5
24.0
20.9
23.5
25.0
28.7
21 .8
19.3
22.2
23.8
20.0
21 .5
19.5
22.0
18.1
20.8
21 .5
22.3
212
22.0
23.6
21 .5
25.2
16.7
23.0
23.8
21 .1
24.9
21 .3
TW4-28
Sampling Event
TABLE 1 (28 of 33)
Historic Summary Of Monitoring Well Analytical Results Up To The 1st Quarter 2022
Chloroform Contamination Investigation
OUSA White Mesa Mill
Parameter
(GWQS)
Carbon Tetrachloride Chloroform Chloromethane Methylene Chloride Chloride
(5 µg/L) (70 µg/L) (30 µg/L) (5 µg/L) No GWQS (mg/L)
2ndQtr 6/19/2013 <1.0 <1.0 <1 .0
3rd Qtr 8/29/2013 <1.0 <1.0 <1 .0
4thQtr 11/6/2013 <1.0 <1.0 <1 .0
1stQtr 1/22/2014 <1.0 <1.0 <1 .0
2nd Qtr 5/21/2014 <1.0 <1.0 <1 .0
3rd Qtr 8/13/2014 <1.0 <1.0 <1 .0
4thQtr 10/23/2014 <1.0 <1.0 <1 .0
1stQtr 3/11/2015 <1.0 <1.0 <1 .0
2ndQtr 6/10/2015 <1.0 <1.0 <1 .0
3rd Qtr 9/2/2015 <1.0 <1.0 <1.0
4th Qtr 10/21/2015 <1.0 <1.0 <1 .0
1stQtr 3/15/2016 <1.0 <1.0 <1 .0
Duplicate TW4-65 <1.0 <1.0 <1 .0
!2ndQtr 5/25/2016 <1.0 <1.0 <1 .0
3rd Qtr 7/27/2016 <1.0 <1.0 <1 .0
Duplicate TW4-65 <1.0 <1.0 <1 .0
114th Qtr 10/19/2016 <1.0 <1.0 <1 .0
Ouclicate TW4-65 <1.0 <1.0 <1 .0
llistotr 3/14/2017 <1.0 <1.0 <1 .0
Duplicate TW4-65 <1.0 <1.0 <1 .0
2nd Qtr 6/14/2017 <1.0 <1.0 <1.0
3rdQtr 7/27/2017 <1.0 <1.0 <1.0
4th Qtr 10/10/2017 <1.0 <1.0 <1 .0
1stQtr 3/14/2018 <1.0 <1.0 <1.0
2nd Qtr 6/12/2018 <1.0 <1.0 <1.0
Duplicate TW4-65 <1 .0 <1.0 <1.0
3rdQtr 8/29/2018 <1 .0 <1.0 <1.0
4th Qtr 11/30/2018 <1.0 <1.0 <1 .0
1s!Qtr 3/16/2019 <1.0 <1.0 <1 .0
2nd Qtr 6/13/2019 <1 .0 <1.0 <1.0
3rdQtr 9/11/2019 <1 .0 <1.0 <1 .0
4th Qtr 12/12/2019 <1.0 <1.0 <1 .0
1stQtr 3/17/2020 <1.0 <1.0 <1 .0
2nd Qtr 6/10/2020 <1 .0 <1.0 <1 .0
3rd Qtr 9/17/2020 <1.0 <1.0 <1 .0
4th Qtr 11/4/2020 <1 .0 <1.0 <1.0
1s1Qtr 3/17/2021 <1.0 <1.0 <1 .0
2nd Qtr 6/15/2021 <1.0 <1.0 <1.0
3rdQtr 9/15/2021 <1.0 <1.0 <1 .0
4thQtr 12/7/2021 <1 .0 <1.0 <1.0
1stQtr 3/15/2022 <1 .0 <1.0 <1.0
TW4-29
2nd Qtr 6/19/2013 <1.0 242 <1.0
2nd Qtr 7/11/2013 <1.0 262 <1.0
3rd Qtr 9/26/2013 <1 .0 246 <1.0
4thQtr 11/13/2013 <1 .0 260 <1 .0
1stQtr 2/5/2014 <1 .0 258 <1.0
2ndQtr 5/22/2014 <1 .0 262 <1 .0
3rd Qtr 8/27/2014 <1 .0 242 <1 .0
4thQtr 10/29/2014 <1 .0 290 <1 .0
1stQtr 3/12/2015 <1 .0 299 <1 .0
2ndQtr 6/11/2015 <1 .0 329 <1 .0
3rd Qtr 9/3/2015 <1 .0 276 <1 .0
4thQtr 10/29/2015 <1 .0 631 <1 .0
1stQtr 3/17/2016 <1 .0 335 <1 .0
2ndQtr 6/8/2016 <1 .0 366 <1.0
3rd Qtr 8/3/2016 <1 .0 401 <1.0
4th Qtr 10/26/2016 <1.0 392 <1.0
1stQtr 3/16/2017 <1.0 446 <1.0
2nd Qtr 6/4/2017 <1.0 420 <1.0
3rdQtr 8/4/2017 <1.0 466 <1.0
4th Qtr 10/11/2017 <1 .0 431 <1.0
1stQtr 3/14/2018 <1.0 533 <1.0
2nd Qtr 6/14/2018 <1.0 474 <1.0
3rdQtr 8/29/2018 <1 .0 454 <1.0
4th Qtr 12/13/2018 <1.0 521 <1.0
1stQtr 3/20/2019 <1.0 507 <1.0
2ndQtr 6/13/2019 <1 .0 537 <1.0
3rdQtr 9/12/2019 <1.0 549 <1.0
4th Qtr 12/18/2019 <1 .0 630 <1.0
1stQtr 3/18/2020 <1 .0 652 <1.0
2ndQtr 6/12/2020 <1 .0 686 <1.0
3rd Qtr 9/19/2020 <1 .0 621 <1.0
4thQtr 11/11/2020 <1.0 671 <1.0
iWMRC SPiit sample <10 670 <20
1statr 3/24/2021 <1.0 577 <1.0
2ndQtr 6/17/2021 <1.0 543 <1.0
3rd Qtr 9/23/2021 <1 .0 602 <1.0
4th Qtr 12/9/2021 <1 .0 625 <1.0
1W4-75 <1 .0 636 <1.0
3 "" <1 .0 624 <1.0
H :z Sample was analyzed beyond holding times and may not be accureate concentration.
Shaded indicates concentrations exceeding GWQS.
<1.0 44.6
<1.0 45.3
<1.0 45.3
<1.0 47.8
<1.0 45.7
<1.0 50
<1.0 52.1
<1.0 52.2
<1.0 56.4
<1.0 61.4
<1.0 52.7
<1.0 61.6
<1.0 61.4
<1.0 67.1
<1.0 70.1
<1.0 70.9
<1.0 70.9
<1.0 73.7
<1.0 64.2
<1.0 66.4
<1.0 68.6
<1.0 67.1
<1.0 57.4
<1.0 65.0
<1.0 55.7
<1.0 56.7
<1.0 63.8
<1.0 52.4
<1.0 51.7
<1.0 51.8
<1.0 49.0
<1.0 50.0
<1.0 52.1
<1.0 49.8
<1.0 47.4
<1.0 49.0
<1.0 51.8
<1.0 48.5
<1.0 40.7
<1.0 47.8
<1.0 38.8
<1.0 44.8
<1.0 37.7
<1.0 41.4
<1.0 42.5
<1.0 14.9
<1.0 38.2
<1.0 41
<1.0 41
<1.0 40.5
<1.0 42.5
<1.0 47.3
<1.0 39.8
<1.0 40.5
<1.0 42.9
<1.0 40.6
<1.0 44.2
<1.0 41.5
<1.0 42
<1.0 42.9
<1.0 37.7
<1.0 43.1
<1.0 40.1
<1.0 45.9
<1.0 40.9
<1.0 39.9
<1.0 39.4
<1.0 38
<1.0 44.8
<1.0 41
<1.0 42.2
<1.0 39.9
<1.0 40.8
<20 42
<1 .0 44.3
<1.0 40
<1.0 40.1
<1.0 38.7
<1 .0 40
<1.0 39.1
Nitrate, Nitrate+ Nitrite
(10 mg/L)
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
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
ti~ 2.
3.
0.7
309
3.59
3.29
2.39
1.91
~.1l
TW4-30
Sampling Event
TABLE 1 (29 of 33)
Historic Summary Of Monitoring Well Analytical Results Up To The 1st Quarter 2022
Chloroform Contamination Investigation
DUSA White Mesa Mill
Parameter
CGWQSl
Carbon Tetrachloride Chloroform Chloromethane Methylene Chloride Chloride
(Suq/L) (70 UQ/L) (30 ua/Ll (5 ua/Ll No GWQS Cma/Ll
2ndQtr 6/19/2013 <1 .0 <1.0 <1.0 <1 .0 36
3rd Qtr 9/26/2013 <1 .0 <1 .0 <1.0 <1.0 36.3
4thOtr 11/13/2013 <1 .0 <1.0 <1.0 <1.0 35.9
1stQtr 1/23/2014 <1 .0 <1 .0 <1.0 <1.0 36.9
2nd Qtr 5/22/2014 <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 10/23/2014 <1 .0 <1.0 <1.0 <1.0 37.1
1stOtr 3/11/2015 <1.0 1.65 <1.0 <1.0 38.3
2nd Qtr 6/11/2015 <1.0 2.25 <1.0 <1 .0 40.3
3rdQtr 9/3/2015 <1 .0 3.27 <1.0 <1.0 44.2
4th Qtr 10/28/2015 <1.0 3.48 <1.0 <1.0 37.8
1stQtr 3/17/2016 <1.0 5.16 <1.0 <1.0 39.6
2nd Qtr 5/26/2016 <1.0 7.38 <1.0 <1.0 40.2
3rd Qtr 8/3/2016 <1.0 6.79 <1.0 <1.0 38.6
4thOtr 10/20/2016 <1.0 8.69 <1.0 <1.0 41.3
1stQtr 3/15/2017 <1 .0 13.6 <1.0 <1.0 37.7
2nd Qtr 6/15/2017 <1.0 15.2 <1.0 <1 .0 37.8
3rd Qtr 8/3/2017 <1 .0 15.7 <1.0 <1.0 39.8
4thOtr 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
3rd Qtr 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
1stQtr 3/15/2019 <1 .0 25.3 <1 .0 <1.0 35.9
2nd Qtr 6/13/2019 <1.0 31.5 <1 .0 <1.0 27.2
3rd Qtr 9/11/2019 <1 .0 34.8 <1 .0 <1.0 34.5
4th Qtr 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
2nd Qtr 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
4th Qtr 11/11/2020 <1.0 82.8 <1 .0 <1.0 37.1
OWMRC solit samole <10 66 <20 <20 39
1stOtr 3/17/2021 <1.0 74.8 <1.0 <1.0 37.6
2nd Qtr 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
11~~;; 12/8/2021 <1.0 81.2 <1.0 <1.0 37.9
3/23/2022 <1.0 73.6 <1.0 <1.0 35.1
TW4•31
2nd Qtr 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
4th Qtr 1117/2013 <1.0 <1.0 <1.0 <1.0 28
1stQtr 1/23/2014 <1.0 <1.0 <1 .0 <1.0 28.5
2nd Qtr 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
4th Qtr 10/28/2014 <1 .0 <1.0 <1.0 <1.0 37.1
1stQtr 3/11/2015 <1 .0 <1.0 <1.0 <1.0 30.6
2nd Qtr 6/10/2015 <1.0 <1.0 <1.0 <1.0 31 .1
3rdQtr 9/2/2015 <1.0 <1.0 <1 .0 <1.0 30.4
4th Qtr 10/21/2015 <1 .0 <1.0 <1.0 <1.0 29.1
1stQtr 3/11/2016 <1.0 <1.0 <1.0 <1.0 31.5
2nd Qtr 5/25/2016 <1.0 <1.0 <1.0 <1.0 32.5
3rdQtr 7/28/2016 <1.0 <1.0 <1 .0 <1.0 30.6
4th Qtr 10/20/2016 <1.0 <1.0 <1.0 <1.0 34
1stOtr 3/15/2017 <1.0 <1.0 <1 .0 <1.0 31 .3
2ndQtr 6/15/2017 <1.0 <1.0 <1.0 <1.0 33.4
3rd Qtr 8/2/2017 <1.0 <1.0 <1.0 <1.0 33
4thQtr 10/10/2017 <1 .0 <1.0 <1 .0 <1.0 30.9
1stQtr 3/14/2018 <1.0 <1.0 <1.0 <1.0 38.8
2ndQtr 6/12/2018 <1.0 <1.0 <1.0 <1.0 34.4
3rd Qtr 8/29/2018 <1.0 <1.0 <1.0 <1.0 40.3
4thOtr 12/12/2018 <1.0 <1.0 <1.0 <1.0 35.2
1stQtr 3/16/2019 <1.0 <1.0 <1.0 <1.0 35
2ndQtr 6/13/2019 <1.0 <1.0 <1.0 <1.0 36.9
3rd Qtr 9/11/2019 <1.0 <1.0 <1.0 <1.0 35.8
4thQtr 12/14/2019 <1.0 <1.0 <1.0 <1.0 40.6
1stOtr 3/17/2020 <1.0 <1.0 <1.0 <1.0 38.2
2ndQtr 6/12/2020 <1.0 <1.0 <1.0 <1.0 36.7
3rd Qtr 9/17/2020 <1.0 <1.0 <1.0 <1.0 36.5
4thOtr 11/4/2020 <1.0 <1.0 <1.0 <1.0 36.4
1stQtr 3/17/2021 <1.0 <1.0 <1.0 <1.0 40.3
2nd Qtr 6/16/2021 <1.0 <1.0 <1.0 <1.0 37.9
3rd Qtr 9/15/2021 <1.0 <1.0 <1.0 <1.0 31.2
4thOtr 12/8/2021 <1.0 <1.0 <1.0 <1.0 40.3
1stQtr 3/16/2022 <1.0 <1.0 <1.0 <1.0 34.3
Shaded indicates concentrations exceeding GWQS.
H = Sample was analyzed beyond holding times and may not be accureate concentration.
Nitrate, Nitrate+ Nitrite
110 ma/Ll
0.95
0.952
1.24
1.36
1.44
1.5
1.84
2.15
1.75
1~ 1.
2.74
2.04
2.32
2.51
2.70
2.95
3.11
2.
3.,
3.s
3.7
3.
4.1
4.1
3.
3.1
3.!
3.
3.
3.
<0.5
3.
4.1
2; 3.
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
TW4-32
Sampling Event
TABLE 1 (30 of 33)
Historic Summary Of Monitoring Well Analytical Results Up To The 1st Quarter 2022
Chloroform Contamination Investigation
DUSA White Mesa Mill
Parameter
{GWQSl
Carbon Tetrachloride Chloroform Chloromethane Methylene Chloride Chloride
{5 µg/L) {70 µg/L) {30 µg/L) {5 µg/Ll No GWQS {mq/Ll
4th Qtr 11/14/2013 <1.0 <1 .0 <1.0 <1.0 52.1
1stOtr 1/22/2014 <1.0 <1 .0 <1.0 <1.0 54.5
2ndQtr 5/21/2014 <1.0 <1 .0 <1.0 <1.0 54.9
3rd Qtr 8/13/2014 <1.0 <1 .0 <1.0 <1 .0 64
4thOtr 10/23/2014 <1.0 <1.0 <1.0 <1 .0 62.6
1stQtr 3/11/2015 <1.0 <1 .0 <1.0 <1 .0 64.2
Duplicate TW4-65 <1.0 <1.0 <1.0 <1.0 65.9
2ndQtr 6/10/2015 <1.0 <1 .0 <1.0 <1 .0 62.7
3rd Qtr 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
4thQtr 10/19/2016 <1.0 <1 .0 <1.0 <1.0 66
1stOtr 3/17/2017 <1.0 <1 .0 <1.0 <1 .0 62.8
2ndQtr 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
3rdQtr 8/29/2018 <1.0 <1 .0 <1.0 <1 .0 68.1
4th Qtr 11/30/2018 <1.0 <1 .0 <1.0 <1 .0 57.5
1stOtr 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
3rdQtr 9/11/2019 <1 .0 <1 .0 <1.0 <1 .0 55.0
4th Qtr 12114/2019 <1 .0 <1.0 <1.0 <1 .0 64.7
1stOtr 3/17/2020 <1.0 <1 .0 <1.0 <1 .0 59.7
2nd Qtr 6/10/2020 <1.0 <1.0 <1.0 <1.0 57.0
3rdQtr 9/17/2020 <1 .0 <1 .0 <1.0 <1 .0 50.8
4thOtr 11/4/2020 <1 .0 <1 .0 <1.0 <1 .0 53.7
1stQtr 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 1217/2021 <1 .0 <1.0 <1.0 <1 .0 55.0
1stOtr 3/16/2022 <1 .0 <1 .0 <1.0 <1 .0 48.0
TW4-33
4th Qtr 11/14/2013 <1 .0 ,_ 126 <1.0 <1.0 47.2
1stOtr 1/30/2014 <1 .0 124 <1.0 <1 .0 43.5
2ndQtr 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
2ndQtr 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
1stOtr 3/17/2016 <1 .0 122 <1.0 <1.0 46.2
2ndQtr 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
4th Qtr 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
2ndQtr 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
2ndQtr 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
4thQtr 12113/2018 <1 .0 141 <1.0 <1 .0 43.2
1stQtr 3/20/2019 <1.0 86.2 <1.0 <1 .0 47.2
2ndQtr 6/19/2019 <1.0 121 <1.0 <1.0 43.4
3rd Qtr 9/12/2019 <1 .0 101 <1.0 <1 .0 41.1
4th Qtr 12118/2019 <1 .0 117 <1.0 <1 .0 48.8
1stQtr 3/18/2020 <1 .0 93.7 <1.0 <1 .0 45.3
2ndQtr 6/10/2020 <1.0 90.1 <1.0 <1 .0 48.9
3rd Qtr 9/18/2020 <1 .0 84.9 <1.0 <1 .0 51.0
4thOtr 11/11/2020 <1 .0 80.6 <1.0 <1 .0 51.5
OWMRC solit sam le <10 68 <20 <20 54
1stQtr 3/18/2021 <1 .0 64.9 <1.0 <1 .0 55.6
2ndQtr 6/17/2021 <1.0 63.9 <1.0 <1.0 54.7
3rdQtr 9/2212021 <1.0 60.2 <1.0 <1 .0 42.5
4thQtr 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
Shaded 111d1cates concentrations exceeding GWQS.
H = Sample was analyzed beyond holding times and may not be accureate concentration.
Nitrate, Nitrate+ Nitrite
{10 mq/Ll
4.26
5.11
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
1.82
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
2.00
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
TW4-34 Sampling Evant
TABLE 1 (31 of 33) Historic Summary Of Monitoring Well Analytical Results Up To The 1st Quarter 2022 Chloroform Contamination Investigation DUSA White Mesa Mill
Parameter IGWQSI Carbon Tetrachloride Chloroform Chloromethane Methylene Chloride Chloride 15 ua/Ll 170 un/LI (30 un/LI (Sunni No GWQS Imo/LI 4th_Qtr 11/14/2013 <1.0 1stQtr 1/23/2014 <1.0 2ndQtr 5/22/2014 <1.0 3rdQtr 8/13/2014 <1.0 4th_Qtr 10/29/2014 <1.0 1stQtr 3/11/2015 <1.0 2ndQtr 6/11/2015 <1.0 3rdQtr 9/3/2015 <1.0 4thQtr 10/21/2015 <1.0 1stQtr 3/16/2016 <1.0 2ndQtr 5/25/2016 <1.0 3rdQtr 8/3/2016 <1.0 4thQtr 10/20/2016 <1.0 1stQtr 3/15/2017 <1.0 2ndQtr 6/15/2017 <1.0 3rdQtr 8/2/2017 <1.0 4thQtr 10/10/2017 <1.0
Duolicate TW4-65 <1.0 'fstQtr 3/14/2018 <1.0 'ndQtr 6/13/2018 <1.0 3rd Qtr 8/29/2018 <1.0 4th Otr 12/12/2018 <1.0 1s1Qtr 3/16/2019 <1.0 2ndQtr 6/13/2019 <1.0 3rdQtr 9/11/2019 <1.0 4thQtr 12/14/2019 <1.0 1stQtr 3/17/2020 <1.0 2ndQtr 6/10/2020 <1.0 3rdQtr 9/17/2020 <1.0 11/4/2020 <1.0 3/17/202f <1.0 6/16/2021 <1.0 9/15/2021 <1.0 12/8/2021 <1.0 3/16/2022° <1.0 TW4-35 8/27/2014 <1.0 4thQtr 10/28/2014 <1.0 1stQtr 3/11/2015 <1.0 2ndQtr 6/10/2015 <1.0 3rdQtr 9/3/2015 <1.0 4thQtr 10/28/2015 <1.0 1stQtr 3/16/2016 <1.0 2ndQtr 5/26/2016 <1.0 3rdQtr 8/3/2016 <1.0 4thQtr 10/20/2016 <1.0 1s1Qtr 3/15/2017 <1.0 2ndQtr 6/15/2017 <1.0 3rdQtr 8/2/2017 <1.0 41hQtr 10/10/2017 <1.0 1s1Qtr 3/14/2018 <1.0 2ndQtr 6/13/2018 <1.0 3rdQtr 8/30/2018 <1.0 4thQtr 12/12/2018 <1.0 1s1Qtr 3/16/2019 <1.0 2ndQtr 6/13/2019 <1.0 3rdQtr 9/11/2019 <1.0 4thQtr 12/14/2019 <1.0 1stQtr 3/17/2020 <1.0 2ndQtr 6/11/2020 <1.0 3rdQtr 9/17/2020 <1.0 4th_Qtr 11/4/2020 <1.0 1s1Qtr 3/17/2021 <1.0 2ndQtr 6/16/2021 <1.0 3rdQtr 9/15/2021 <1.0 4thQtr 12/8/2021 <1.0 1s1Qtr 3/22/2022° .<1.0 ....... u 3rdQtr 8/27/2014 <1.0 4thQtr 10/23/2014 <1.0 1stQtr 3/11/2015 <1.0 2ndQtr 6/10/2015 <1.0 3rdQtr 9/3/2015 <1.0 4thQtr 10/21/2015 <1.0 1s1Qtr 3/11/2016 <1.0 2ndQtr 5/26/2016 <1.0 ... 3rdQtr 7/28/2016 <1.0 4thQtr 16/2012016 <1.0 Dup<cate TW4-70 ................................. ,<1,.0 1stQtr 3/15/2017 2ndQtr 6/15/2017 3rd Qtr 8/2/2017 4thQtr ....................... 1011oi2011. 1st Otr 3/14/2018 2nd Qtr 6/12/2018 3rd Qtr 8/29/2018 4thQtr ....................... 12J1212018 1st0tr 3/16/2019 2ndQtr 6/13/2019 3rdQtr 9/11l2019
<1.0 <fO <1.0 <1°.0 <1.0 <1.0 <1.0 .�t.P <1.0 <1.0 <1.0 4th atr .... -.......... ,_ 1211412018 .. <1,.o 1st Qtr 3/17/2020 <1.0 2ndQtr 6/11/2020 <1.0 3rd Qtr 9/17l2020 <1.0 4thQtr .......................... 1,1/4/2020, ,<1,.0 1stQtr 3/17/2021 2nd Qtr 6/16/2021 3rd Qtr 9/15/2021 4th Qtr ........................ 12/8l2021 1st Qtr 3/16/2022
<1.0 <1.d <1.0 <1.0 <'f:'ti
Shaded lndIcate1 concentrations exceeding GWQS.
<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 <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 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 <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 <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 0<1.0 <1,0 <f.O <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 <f.o
...
..
<1.0 19.2 <1.0 20.4 <1.0 17.9 <1.0 18 <1.0 17.8 <1.0 17.7 <1.0 17.4 <1.0 15.1 <1.0 15.8 <1.0 17.3 <1.0 18 <1.0 17.2 <1.0 19 <1.0 18.0 <1.0 15.7 <1.0 19.8 <1.0 18.5 <1.0 20.4 <1.0 19.1 <1.0 19.5 <1.0 23.8 <1.0 18.5 <1.0 17.9 <1.0 20.1 <1.0 17.8 <1.0 21.4 <1.0 20.1 <1.0 20.9 <1.0 19.0 <1.0 18.7 <1.0 19.3 <1.0 17.8 <1.0 15.0 <1.0 19.6 <1.0 17.3
<1.0 34 <1.0 34.1 <1.0 34.9 <1.0 35.2 <1.0 35.9 <1.0 33.4 <1.0 35.4 <1.0 35.4 <1.0 34.8 <1.0 37.1 <1.0 33.7 <1.0 34.8 <1.0 36.3 <1.0 31.7 <1.0 37.4 <1.0 33.7 <1.0 39.3 <1.0 43.0 <1.0 33.5 <1.0 35.5 <1.0 31.7 <1.0 37.4 <1.0 34.5 <1.0 34.0 <1.0 32.2<1.0 30.4 <1.0 35.6 <1.0 34.1 <1.0 27.5 <1.0 34.3 <1.0 21:Ii
<1.0 65 <1.0 67.3 <1.0 67.2<1.0 69.3 <1.0 76.4 <1.0 64.5 <1.0 67.2<1.0 72.3 <1.0 69.4 <1.0 73.8 <1.0 72 <1.0 60:·2 <1.0 71.3 .. <1.0 69.6 ,<1°.0 62.9 <1.0 73.8 <1.0 84.3 <1.0 76.4 <1.0 65.8 <1.0 ... 65 <1.0 71.5 <1.0 69:e <1.0. 73.7 <1.0 69.1 <1.0 67.0 <1.0 66.0 <1.0 84.0 <1.0 72.5 ... <1.0 68:1 <1.0 63.1 <1.0 69:9 <1.0 61.2
Nitrate, Nitrate+ Nitrite 110 ma/Ll 1.64 1.93 1.69 1.10 1.16 1.21 0.868 0.458 0.368 0.925 0.605
0.726 0.612
0.674 0.727 0.733
0.774 0.784 0.737 0.877 0.736
0.889 0.859 0.994 0.934 1.07 1.090 1.240 0.978 1.04 1.09 1.08 1.1 1.02 f5
0.2 0.351 0.436
0.452 0.304 0.419 0.521 0.631 0.723 0.626 0.673 0.699 0.670 0.651 0.740 0.662 0.527 0.559 0.574 0.670 0.525 0.524 0.595 0.699 0.760 0.756 0.991 101 1.2 1.230 1.3
<0.1 <0.1 <0.1 <0.1 <0.1 <0.1 <0.1 <0,1 <0.1 <0.1 <0.1 <CH <0.1 <0,1 0.104 <0.1 <d:1 ..<0.1 6.123 0.116 <0.1 <0 ,1 <0,1 <O."f <0.1 <d:1 <0.1 <(fi' <0.1 <0.1 <0.1 cri'
TW4-37
(chloroform pumping well 6/9/15)
Sampling Event
2nd Qtr 6/8/2015
3rdQtr 9/3/2015
4th Qtr 10/19/2015
1stQtr 3/9/2016
2nd Qtr 5/23/2016
3rd Qtr 7/25/2016
4thQtr 10/12/2016
1sIQtr 3/8/2017
2nd Qtr 6/15/2017
3rd Qtr 7/26/2017
4thQtr 10/11/2017
1sIQtr 3/12/2018
2ndQtr 6/8/2018
3rd Qtr 8/22/2018
4thQtr 11/28/2018
1sIQtr 3/8/2019
2ndQtr 6/5/2019
3rd Qtr 9/4/2019
4thQtr 12/10/2019
1s1Qtr 2/19/2020
2ndQtr 5/27/2020
3rd Qtr 9/4/2020
4thQtr 10/28/2020
1s1Qtr 2/23/2021
2ndQtr 6/9/2021
3rd Qtr 8/24/2021
4thQtr 12/1/2021
1s1Qtr 3/9/2022
TW4-38
4th Otr 11/10/2016
1s!Qtr 3/15/2017
2ndQtr 6/15/2017
3rd Qtr 8/2/2017
4th Qtr 10/10/2017
1stQtr 3/14/2018
2ndQtr 6/13/2018
3rd Qtr 8/30/2018
4th Qtr 12/12/2018
1stQtr 3/16/2019
2nd Qtr 6/13/2019
Duplicate TW4*70
3rd Qtr 9/11/2019
4th Qtr 12/14/2019
1sIQtr 3/17/2020
2ndQtr 6/11/2020
3rd Qtr 9/18/2020
4thQtr 11/4/2020
1s1Qtr 3/18/2021
2nd Qtr 6/16/2021
Oup~cate TW4-70
3rd Qtr 9/15/2021
4th Qtr 12/8/2021
1.c:.rutr 3/22/2022
TW4-39(cNorofonn pumping -ii
(1112016)
4th Qtr 11/11/2016
1sIQtr 3/8/2017
2nd Qtr 6/15/2017
3rd Qtr 7/26/2017
4th Qtr 10/10/2017
1stQtr 3/12/2018
2nd Qtr 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
1stQtr 2/19/2020
2ndQtr 5/27/2020
3rdQtr 9/18/2020
4thQtr 10/28/2020
1stQtr 2/23/2021
2ndQtr 6/9/2021
3rd Qtr 8/24/2021
4th Qtr 12/1/2021
1st Qtr 3/9/2022
TABLE 1 (32 of 33)
Historic Summary Of Monitoring Well Analytical Results Up To The 1st Quarter 2022
Chloroform Contamination Investigation
DUSA While Mesa Mill
Parameter
(GWQS)
Carbon Tetrachloride Chloroform Chloromethane Methylene Chloride Chloride
(5 µg/L) (70 µg/L) (30 µg/L) (5 µg/L) No GWQS (mg/L)
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 16400 <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 15200 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 10300 29.4 <1 .0 254
<1 .0 9,380 <1.0 <1 .0 242
8.46 13,000 1.98 <1 .00 176
7.65 10,200 <1.0 <1 .0 220
11.5 14800 6.7 5.05 410
12.2 13 700 <1.0 <1 .0 414
<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
<1 .0 <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 32.7
<1 .0 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 6520 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 1650 <1.0 <1 .0 74.7
<1 .0 812 <1.0 <1 .0 76.5
7.56 5,870 <1.0 <1 .0 88.5
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 78.7
<1 .0 776 <1.0 <1 .0 82.4
<1 .0 724 <1.0 <1 .0 75.2
Shaded 1nd1cates concentrations exceeding GWQS.
Nitrate, Nitrate+ Nitrite
(10 mg/L)
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
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
20.7
6.44
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
2.9
I VY"-"'U
(chloroform pumping well
5/2019)
Sampling Event
TABLE 1 (33 of 33)
Historic Summary Of Monitoring Well Analytical Results Up To The 1st Quarter 2022
Chloroform Contamination Investigation
DUSA White Mesa Mill
Parameter
(GWQS)
Carbon Tetrachloride Chloroform Chloromethane Methylene Chloride Chloride
I5ua/Ll 170 ua/Ll 130 ua/Ll 15 ua/Ll No GWQS lma/Ll
1stQtr 3/21/2018 <1.0 248 <1.0 <1.0 35.7
2nd Qtr 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
4thQtr 12/12/2018 <1.0 118 <1.0 <1.0 29.9
f-2mto~•-75
3/20/2019
<1.0 119 <1.0 <1.0 32.3
<1.0 111 <1.0 <1.0 30.9
2nd Qtr 6/5/2019 ~---------------263 <1.0 <1.0 35.6 <1.0
3rdQtr 9/4/2019 <1.0 380 <1.0 <1.0 35.9
4thQtr 12/10/2019 <1.0 314 <1.0 <1.0 36.7
1stQtr 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
3rdQtr 9/4/2020 <1.0 333 <1.0 <1.0 34.2
4thQtr 10/28/2020 <1.0 264 <1.0 <1.0 34.6
1stQtr 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
3rdQtr 8/24/2021 <1.0 301 1.32 <1.0 31 .8
4th0tr 12/1/2021 <1.0 286 <1.0 <1.0 38.4
1st l.llr 3/9/2022 <1.0 238 <1.0 <1.0 36.8
TW441 (chloroform pumping well
5/2018)
2ndQtr 5/8/2018 <1.0 1,400 <1.0 <1.0 42.8
3rdQtr 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
2ndQtr 6/5/2019 <1.0 1,320 <1.0 <1.0 38.1
3rdQtr 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 2/23/2021 <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
4thQtr 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
TW4-42
2ndQtr 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
4thQtr 12/10/2019 <1.0 <1.0 <1.0 <1.0 22.6
Ouolicate TW4-75 <1.0 <1.0 <1.0 <1.0 22.6
istQtr 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 '<'i 0 <1.0 <1.0 <1.0 21 .5
Ou licate TW4-65 <1.0 <1.0 <1.0 <1.0 17.7
TW4-43
4th Qtr 12/9/2021 <1.0 1<1.0 1<1.0 1<1.0 I 40.61
1stQtr 3/17/2021 <1.0 1<1.0 <1.0 1<1.0
Shaded 1nd1cates concentrations exceeding GWQS.
,i2,LChloroform_~·Jnl~weM stated in M!)12019. _____ _
Nitrate, Nitrate+ Nitrite
I10ma/Ll
3.08
3.33
3.22
3.54
3.18
3.18 ----------11;
2.
2.98
2.91
2.88
2.58
2.4
3.7
1.5
2.6
?
6.54
6.13
5_n?
6.71
6.00
6.22
6.11
6.12
6.78
6.69
6.25
6.41
7.45
3.77
57: ~.
2~1
2.
2.
2.
2.88
3.23
3.65
2.77
3.15
3.57
3.26
2.02 ;;
0.118
Parameter GWQS
Chloride none
Nitrate+ Nitrite (as N) 10 mo/L
Chloroform 70 ua/L
Carbon tetrachloride 5 ua/L
Chloromethane 30 µQ/L
Methvlene Chloride 5 11ntL
nc = not calculated
Table2
Summary of EFR QA/QC Samples
1st Quarter 2022
Duplicate Samples of Wells
Duolicate of TW4-42 Duplicate of TW4-23
TW4-42 TW4-65 RPO TW4-23 TW4-70 RPO
21.5 17.7 19.4 43.8 39.2 11.1
2.50 2.6 -3.9 <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 <1.0 <1.0 nc
<1.0 <1.0 nc <1.0 <1.0 nc
.... illll&Wlll......_.
Duplicate of TW4-1 0
TW4-10 TW4-75 RPO
49.0 44.8 9.0
5.10 4.9 4.0
471 456 3.2
<1.0 <1.0 nc
1 1 0.0
<1.0 <1.0 nc
Well ID MW4 MW-26 TW4-1
(')Chloroform (ug/L) 1,040 1,030 946
Chloroform (g/L) 1.04E-03 1.03E-03 9.46E-04
Chloroform (lbs/L) 2.30E-06 2.28E-06 2.09E-06
Chloroform (lbs/qal} 8.70E-06 8.61E-06 7.91E-06
Total gallons pumped 96,291 .3 29,113.3 8,251 .8
lbs of chloroform removed 0.8 0.3 0.07
Gallons of chloroform removed 0.07 0.02 0.01
total lbs of chloroform removed 8.4
total qallons of chloroform removed 0.7
Tabel3
Chloroform Mass Removal Calculations for the 1st Qurater 2022
EFR White Mesa Mill, Bland, Utah
TW4-2 TW4-4 TW4-11 TW4-19 TW4-21 TW4-22
1,020 1,010 2,780 654 469 3,320
1.02E-03 1.01E-03 2.78E-03 6.54E-04 4.69E-04 3.32E-03
2.25E-06 2.23E-06 6.14E-06 1.44E-06 1.04E-06 7.34E-06
8.53E-06 8.45E-06 2.32E-05 5.47E-06 3.92E-06 2.78E-05
11,380.6 10,434.1 1,492.2 112,209.2 91 ,105.4 22,083.6
0.10 0.1 0.03 0.6 0.4 0.6
0.01 0.01 0.00 0.05 0.03 0.05
1) Assuming that the chloroform concentration result for the quarter monitoring event is the average chloroform concentration for the entire quarter.
Chloroform Pumping Wells -
itrate P,um~'"'W=e,,lls,_ ______ _
AB = Abandonded Well
TW4-24 TW4-25 TW4-37 TW4-39 TW4-40 TW4-41
114 0 13,700 724 238 1,030
1.14E-04 O.OOE+OO 1.37E-02 7.24E-04 2.38E-04 1.03E-03
2.52E-07 O.OOE+OO 3.03E-05 1.60E-06 5.26E-07 2.28E-06
9.53E-07 O.OOE+OO 1.15E-04 6.05E-06 1.99E-06 8.61 E-06
73,545.0 92,972.1 42,923.5 35,550.2 53,009.2 12,247.8
0.070 0.00 4.9 0.2 0.11 0.1
0.006 0.00 0.40 0.02 0.01 0.01