DRC-2023-072476 - 0901a0688127ae8c

State ofUtah
SPENCER J. COX
Governor
DEIDRE HENDERSON
Lieutenant Governor
TO: Phil Goble
Department of
Environmental Quality
Kimberly D. Shelley
Executive Director
DIVISION OF WASTE MANAGEMENT
AND RADIATION CONTROL
Douglas J. Hansen
Director
MEMORANDUM
FROM:
DATE:
Dean Henderson ;/J#
September 14, 2023
SUBJECT: Review of the August 8, 2023 2nd Quarter, 2023 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 August
8, 2023, 2nd Quarter, 2023 Chloroform Monitoring Report ("Report") for the Chloroform
Contamination Investigation. For the review of this report the following regulatory enforcement
documents were used:
• EFRI issued Ground Water Quality Discharge Permit No. UGW370004 ("Permit"). Permit
version that was signed on March 19, 2019.
• The EFRI Quality Assurance Plan ("QAP") September 10, 2019 (Revision. 7 .6)
• The EFRI Groundwater Corrective Action Plan ("GCAP") September 14, 2015 (Revision 0)
• Utah Stipulation and Consent Order Docket Number UGW20-01, September 16, 2015.
REVIEW
GCAP Part 111.C requires the 2nd Quarter Report to be submitted to the Division on or before September
1, of each year. The Report was received by the Division on August 10, 2023 ( date of Report
August 8, 2023) which meets the GCAP requirement.
Monitor and Pumping Well Sampling
The following 43 monitor wells were sampled as required in the GCAP (see Table 1 below):
15 pumping wells: MW-4, MW-26, TW4-1 , TW4-2, TW4-4, TW4-11 , TW4-19, TW4-21 , TW4-22,
TW4-24, TW4-25, TW4-37, TW4-39, TW4-40, and TW4-41.
DRC-20 195 North 1950 West • Salt Lake City, UT
Mailing Address P.O. Box 144880 • Salt Lake City, UT 84114-4880
Telephone [phone] • Fax [phone] • T.D.D. [phone]
www.deq.11tah.gov
Printed on I 00% recycled paper
DRC-2023-072426
Page 2
Current 5 performance monitoring ("PM") wells: TW4-7, TW4-10, TW4-16, TW4-26, and TW4-29.
Current 23 compliance monitoring ("CM") wells MW-32, TW4-3, TW4-5, TW4-6, TW4-8, TW4-9,
TW4-12, TW4-13, TW4-14, TW4-18, TW4-23, TW4-27, TW4-28, TW4-30, TW4-31, TW4-32, TW4-
33, TW4-34, TW4-35, TW4-36, TW4-38, TW4-42, and TW4-43.
The water samples for the above wells were analyzed for the following constituents as required in the
QAP:
Chloroform
Chloromethane
Carbon tetrachloride
Chloride
Methylene chloride
Nitrate + Nitrite as Nitrogen.
The analytical methods used is consistent with the requirements of the GCAP. For a summary of the
2nd Quarter, 2023 and historic analytical results see Table 1 below.
Groundwater Head Monitoring
Depth to groundwater was measured in the following wells and/or piezometers, as required in Part I.E.3
of the Permit:
• The quarterly groundwater compliance monitoring wells.
• Existing monitoring well MW-4 and all of the temporary chloroform investigation wells.
• Piezometers P-1, P-2, P-3A, P-4 and P-5.
• MW-20 and MW-22.
• Nitrate monitoring wells.
• The DR piezometers which were installed during the Southwest Hydrologic Investigation.
In addition, weekly and monthly depth to groundwater measurements were taken in pumping wells
MW-4, MW-26, TW4-l, TW4-2, TW4-4, TW4-ll, TW4-19, TW4-21, TW4-22, TW4-24, TW4-25,
TW4-37, TW4-39, TW4-40, TW4-41, TW4-42, and TWN-2.
The monitoring wells were purged using the three approved QAP well purging strategies and meet QAP
requirements for each strategy:
1. Purging two casing volumes with stable field parameters for specific conductivity,
turbidity, pH, redox potential, and water temperature (within 10% RPD):
Wells: MW-32, TW4-5, TW4-8, TW4-9, TW4-16, TW4-18, TW4-23, TW4-32, and TW4-38.
2. Purging a well to dryness and stability of field parameters for pH, specific conductivity, and.
water temperature only after recovery:
Wells: TW4-3, TW4-6, TW4-7, TW4-10, TW4-12, TW4-13, TW4-14, TW4-26, TW4-27,
TW4-28, TW4-29, TW4-30, TW4-31, TW4-33, TW4-34, TW4-35, TW4-36, TW4-42, TW4-43.
3. The pumping wells are continuously pumped on a set schedule and are sufficiently purged to
collect a sample
Page 3
Pumping Wells: MW-4, MW-26, TW4-1, 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.
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
TW4-38 and its duplicate sample TW4-70; and TW4-9 and its duplicate sample TW4-75. All analytical
results for the three sample/duplicate pairs were within the 20% relative percent difference (RPD)
acceptance limits.
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 2nd Quarter 2023 is 11.4 lbs. (see Table 3 below) which is more than the estimated 5.9 lbs.
removed in the 1st Quarter 2022. The increase in mass removal is primarily due to a increase in the
concentrations in TW 4-19.
Using the "Chloroform Plume Mass Calculation Method" as described in Appendix A of the GCAP the
residual mass of chloroform within the plume is estimated as 928 lbs. in the 2nd Quarter, 2023. This is
approximately 484 lbs. larger than the 1st Quarter 2023 estimated mass of 444 lbs. This increase in
concentration is primarily due to increases in MW-26, TW4-4, TW4-19 and TW4-39.
As per Part 111.B.2 of the GCAP, the electronic files were used in 2nd Quarter, 2023 to calculate the
mass estimates. The following files were used to calculate the estimated chloroform mass within the
chloroform plume:
Page 4
• Excel spreadsheet that included: well name; well location ( easting and northing); Laboratory
reported concentration in µg/1 in the 1st Quarter, 2023 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; minx, max x
(UTME[m]): 631900, 633043; min y, max y (UTME[m]): 4154240, 4155550.64; grid spacing in
X, y (m): 15.24, 15.24
• Surfer chloroform concentration grid file.
• Concentration GE 70 Grid file
• Intermediate Surfer Grid Files: water level grid; aquifer base grid; saturated thickness grid
Based on the review of these files it appears that the date entered and generated is appropriate to
calculate an estimated chloroform mass within the chloroform plume and EFRI followed Part 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
Page 5
e) Electronic copy of all laboratory results for Chloroform Investigation monitoring conducted
during the quarter.
f) Copies of DUSA field records, laboratory reports and chain of custody forms.
Evaluation of the Chloroform Contaminate Plume and Its Associated Contaminants
Bounding Chloroform Plume
Groundwater monitoring data up to the 2nd Quarter, 2023 monitoring event appeared to show that the
chloroform contaminate plume ("Plume") and associated contaminants ( carbon tetrachloride,
chloromethane, and methylene chloride) is bound by up gradient, cross gradient, and down gradient
compliance monitoring wells that have a chloroform concentration of <70 µg/L ("GWQS = 70 µg/L).
Performance Monitor Wells ("PM") [Wells Exceeding Chloroform Concentrations GWOS of 70µg/L]
Five (5) PM wells still exceed 70 µg/L: TW4-7, TW4-10, TW4-16, TW4-26, and TW4-29.
Compliance Monitor Wells ("CM") [Wells with Chloroform Concentrations between< 1 and 70µg/L]
Nine (9) CM wells range with detectable chloroform concentration but still below 70µg/L: TW4-5,
TW4-6, TW4-8, TW4-9, TW4-18, TW4-27, TW4-30, TW4-33, and TW4-34.
CM Wells Below the Laboratory Chloroform Detection Limit ( < 1. 0 µg/L)
Fourteen (14) 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, TW4-35, TW4-36, TW4-
38, TW4-42, and TW4-43.
Pumping Wells
There are 15 pumping wells in full operation in the 2nd Quarter, 2023, 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 TW4-21 (17.3), TW4-22 (49.1 mg/L), TW4-24 (49.8 mg/L) and TW4-26 (10.0 mg/L)
exceed the nitrate GWQS of 10 mg/L. These nitrate exceedances appear to be a result of the nitrate
contaminant plume up-gradient of the chloroform contaminant plume. This nitrate contaminant plume is
being addressed under the Nitrate Corrective Action Plan, approved on December 12, 2012.
Well TW4-27 (16.9 mg/L) continue to exceed the nitrate GWQS of 10 mg/1. The source of nitrate may
be from the chloroform source plume. Wells TW4-29, TW4-30, and TW4-31 located approximately
200 feet down and/or cross gradient of TW4-27 have nitrate concentrations in the 2nd quarter 2023
below the nitrate GWQS of 2.65 mg/L, 3.02 mg/L, and 0.444 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.
Well TW4-28 (11.9 mg/L) exceed the nitrate GWQS of 10 mg/1. The source of nitrate may be from the
chloroform source plume. Well, TW4-32 located approximately 200 feet down gradient ofTW4-28 has
Page 6
a nitrate concentration in the 2nd quarter 2023 below the nitrate GWQS of 1. 77 mg/L. Therefore, at this
time no action is recommended. However, should future nitrate concentrations in down gradient well
TW4-32 increases to above 10 mg/Lor shows an increasing trend an additional investigation may be
recommended.
Conclusions on Compliance with the Permit and QAP
Per the Division review it appears that the Report complies with Permit, QAP, and GCAP. Therefore, a
letter will be drafted notifying EFRI of the review and closing out of for the August 8, 2023, 2nd
Quarter, 2023 Chloroform Monitoring Report for the chloroform contamination investigation.
Page 7
References
EFRI, State of Utah Stipulated and Consent Order ("SCO") Docket Number UGW-20-01 White
Mesa Mill-Energy Fuels Resources (USA) Inc. ("EFRI") Plan and Time Schedule, Revision 1,
Pursuant to Part II.H.2 of the Groundwater Corrective Action Plan ("GCAP") included as
Attachment 1 to the SCO, January 10, 2018.
EFRI Quality Assurance Plan ("QAP") June 23, 2018 (Revision. 7.4)
EFRI issued Ground Water Quality Discharge Permit No. UGW370004. Permit version that was
signed on March 19, 2019.
EFRI, White Mesa Uranium Mill Chloroform Monitoring Report 2nd (April through June) 2023.
(DRC-2023-069754)
Page 8
Tables 1 through 3
TABLE 1 (1 of 33)
Historic Summary Of Monitoring Well Analytical Results Up To The 2nd Quarter 2023
Chloroform Contamination Investigation
MW-4(chlcl«Jrormpumpng-'
ttaned pumpng 314.()3)
Sampling Event
Carbon Tetrachloride Chloroform
(5 •a/LI (70 •a/LI
1st Qtr 3/16/2005 NA 2,900
2nd Qtr 512512005 NA 3,170
3rd Otr 813112005 <10 3,500
4th Qtr 121712005 <50 3,000
1st0tr 31912006 <50 3,100
2nd Qtr 611412006 <50 3.000
3rdQtr 712012006 <50 2,820
4th Qtr 111812006 2.1 2,830
1stOtr 212812007 1.6 i.300
2nd Qtr 612712007 1.8 2.000
3rd Qtr 811512007 1.9 2,600
4th Qtr 1011012007 1.7 2,300
1st0tr 3/2812008 1.7 2.400
2nd0tr 612512008 1.8 2,500
3rdQtr 9/1012008 1.8 1,800
4th Qtr 1011512008 1.7 2,100
1st0tr 31412009 1.5 2,200
2nd Qtr 6/2312009 1.3 1,800
3rdQtr 911412009 1.4 2.000
4th Qtr 1211412009 1.6 1,800
1st Ctr 211712010 1.2 1,600
2nd Otr 6114/2010 1.2 2,100
3rd Otr 81612010 1.5 1,900
4th Qtr 1011512010 1.4 1.500
1st Qtr 212312011 1.5 1.700
2nd Qtr 61112011 1.4 1.700
3rdQtr 811712011 1.1 1.700
4th Otr 1111612011 1.3 -··· 1.600 l sfCIIr1l~ _ 112312012 1 1,500
2nd Qtr 61612012 1.2 ---,:.oo
3rd Otr 91412012 1.5 1.500
4thQtr 101412012 1 1.300
1st Qtr 211112013 1.48 1,670
2nd Qtr 61512013 1.31 1,490
3rdQtr 91312013 1.13 1,520
4thQtr 10/2912013 5.58 1,410
1st Otr 1/2712014 4.15 1,390
2nd Otr 511912014 5.21 1,390
3rd Qtr 811112014 7.6 1,490
4th Qtr 1012112014 <1.0 1,440
1st0tr(21 31912015 1.26 ---1~00
2nd Qtr 61812015 <1.0 1,300
3rd Qtr 8/3112015 <1.0 1.200
4th Qtr 1011912015 <1.0 1.200
1statr 3/912016 <1.0 1,240
2nd Otr 512312016 1.44 1,580
3rdQtr 712512016 <1.0 1,430
4thQtr 1011212016 1.?.4.,,.,,.,_ 1,470
1st Otr 3/812017 1.22 1,450
2nd Qtr 611312017 1.15 1,430
3rd Qtr 712612017 1.15 1,400
4th Otr 1011112017 <1.0 1,320
DWMRC ~ ·~-~'-<19 1.400
1st Qtr 311212018 1.07 1,320
2nd Qtr 61812018 <1.0 1,240
3rd Qtr 8122/2018 <1.0 1.300
4thQtr 1112812018 <1.0 1,330
1st Otr 31812019 <1.0 1,190
2nd Qtr 61512019 <1.0 1,300
3rdQtr 91412019 <1.0 1,180
4th Qtr 1211012019 <1.0 1,370
1s1a1r 211912020 <1.0 1,230
2nd Ctr 512712020 <1.0 1,250
3rd Otr 91412020 <1.0 1,240
4th Qtr 10/1812020 <1.0 1,050
1st Ctr 2/2312021 <1.0 1,150
2nd Otr 61912021 <1.0 1,320
3rd Otr 8/2412021 <1.0 1,140
4th Qtr 121112021 <1.0 ,,,_., 1,100
1stOtr 3/9/2022 <1.0 1,040
2nd Otr 61812022 <1.0 1,010
3rd Otr 8130/2022 <1.0 1.200
4th Qtr 1113012022 <1.0 1,170
1stOtr 3n 12023 <1.0 1,010
2nd Otr 61612023 <1.0 1 050
MW-4A TW4-A
1stOtr 3116/2005 NA 3,700
2nd Qtr 512512005 NA 3,740
3rd Qtr 8131/2005 <10 3,800
4th Ctr 121712005 <50 3.000
1stQtr 319/2006 <50 3,700
2nd Qtr 6/1412006 <50 3,300
3rd Otr 712012006 <50 3,190
4th Otr 111812006 2.4 3,370
1st Ctr 212812007 1.9 2,500
(1 l As of March 2012 both I\Orth and south wild lrfe ponds no longer receMng water
(2) chloroform pumpmg:.wells TW4-1 TW4-2, and TW4•11 5tarted in 1/14/15 __ •
NA = not analyzed
Shaded indicate& concentrations exceeding GWQS.
Bold and italics indicates the MDL exceeded the GWOS.
J = Approximated value
OUSA White Mesa Mill
Parameter
IGWQSI
Chloromethane Methylene Chloride Chloride
(30 •a/LI (5 •g/L) No GWQS lmnn )
NA NA NA
NA NA NA
<10 <10 NA
<50 <50 53
<50 <50 49
<50 <50 49
<50 <50 48
1.4 <1.0 50
<1.0 .... ·<·1.0 47
<1.0 <1.0 45
<1.0 <1.0 47
<1.0 <1.0 45
<1.0 <1.0 42
<1.0 <1.0 42
<1.0 <1.0 35
<1.0 <1.0 45
<1.0 <1.0 37
<1.0 <1.0 34
<1.0 <1.0 43
<1.0 <1.0 44
<1.0 <1.0 45
<1.0 <1.0 41
<1.0 <1.0 38
<1.0 <1.0 41
<1.0 <1.0 40
<1.0 <1.0 35
<1.0 <1.0 41
<1.0 <1.0 40 "<T."o <1.0 --------4);{!' <1.0 ______ <1.0 39.0
<1.0 <1.0 41 .0
<1.0 <1.0 41 .0
<1.0 <1.0 37.8
<1.0 <1.0 44.0
<1.0 <1.0 41 .4
<1.0 <1.0 40.1
<1.0 <1.0 38.5
<1.0 <1.0 39.9
<1.0 <1.0 41 .0
<1.0 <1.0 --------4).~ <1.0 ______ <1.0 40.7
<1.0 <1.0 43.1
1.42 <1.0 44.3
<1.0 <1.0 40.8
<1.0 <1.0 42.i
<1.0 <1.0 43.7
<1.0 <1.0 42.5
<1.0 <1.0 44.8
<1.0 <iO 43.3
<1.0 <1.0 44.0
<1.0 <1.0 43.8
<1.0 <1.0 43.8
<30 70 J 43.0
<1.0 <1.0 46.2
<1.0 <1.0 43.5
<1.0 <1.0 48.5
<1.0 <1.0 43.1
<1.0 <1.0 41.5
<1.0 <1.0 40.6
<1.0 <1.0 41 .9
<1.0 <1.0 45.5_
<1.0 <1.0 48.1
<1.0 <1.0 40.7
<1.0 <1.0 43.8
<1.0 <1.0 41.4
<1.0 <1.0 46.5
<1.0 <1.0 34.8
<1.0 <1.0 43.2
::J..O <1.0 47.6
<1.0 <1.0 40_'9
<1.0 <1.0 43.7
<1.0 <1.0 44.7
<1.0 <1.0 35.9
<1.0 <1.0 29.4
2.0 <1.0 37.0
NA NA NA
NA NA NA
<10 <10 NA
<50 <50 55
<50 <50 53
<50 <50 54
<50 <50 54
<1.0 <1.0 54
<1.0 <1.0 60
Well abandonded
Nitrate, Nitrate + Nitrite
110 mn/L)
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 ·;jgg
4.88
4.59
5.25
5.1
4.47
4.64
4.55
4.44
5.05
5.16
4.69
4.34
6.22
5.04
4.93
4.62
4.61
6.48
3.83
4.90
4.80
3.90
4.20
4.05
4.44
4.20
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 2nd Quarter 2023
Chlorofonn Contamination Investigation
DUSA White Mesa Mill
MW-26 {formefTW4-15)Chlorolorm
pumpng wel ttarted 8IMl3 Parameter
Sampling Event IGWQSI
Carbon Tetrachloride Chloroform Chloromethane Methylene Chloride
(5 ua/L) (70 ua/LI 130 uc/LI (5 ua/LI
3rdQtr 9/2/2002 NA 2.6 NA NA
4th Otr 11/2/2002 NA <1.0 NA NA
1st0tr 3/3/2003 NA <1.0 NA NA
2nd Qtr 6/23/2003 NA 7800 NA NA
3rd0tr 9/12/2003 NA 2500 NA NA
4th Qtr 11/8/2003 NA 3000 NA Ni\ -·
1stQtr 3/16/2005 NA 310 NA NA
2nd Otr 5/25/2005 NA 442 NA NA
3rd Qtr 8/31/2005 <5.0 960 5.4 <5.0
4th Qtr 12/7/2005 <$11 1,000 <50 <50
1st0tr 3/9/2006 <50 1,100 <50 <50
2nd Qtr 6/14/2006 <50 830 <50 <50
3rd Qtr 7/20/2006 <50 2,170 <50 <50
4thQtr 11/8/2006 <1.0 282 <1 .0 2.6
1st Qtr 2/28/2007 <1.0 570 <1.0 5.5
2nd Qtr 6/27/2007 <1.0 300 <1.0 13
3rdQtr 8/15/2007 <1.0 1,400 <1.0 36
4th Otr 10/10/2007 <1.0 2,000 <1.0 14
1st0tr 3/28/2008 <1.0 930 <1.0 40
2nd Otr 6/25/2008 <1.0 1,300 <1.0 53
3rd0tr 9/10/2008 <1.0 630 <1.0 ,_ 24
4th Qtr 10/15/2008 NA NA NA ,_ NA
11/18/2008 <2.0 1,70.0 <2.0 rnr
tstOtr 3/4/2009 <1.0 950 <1.0 51
2nd Otr 6/23/2009 <1.0 410 <1.0 12
3rd Otr 9/14/2009 <1.0 850 <1.0 30
4th Otr 12/14/2009 <1.0 1.100 <1.0 40
tstatr 2/17/2010 <1.0 730 <1.0 19
2nd Qtr 6/14/2010 1.2 1.600 <1.0 <1.0
3rdQtr 8/16/2010 <1.0 2,200 <1.0 21
4th Qtr 10/15/2010 <1.0 970 <1.0 6.5
1stQtr 2/23/2011 <1.0 450 <1.0 3.6
2nd Qtr 5/31/2011 <1.0 1,800 <1.0 ,_ 1.3
3rd0tr 8/17/2011 <1.0 720 <1.0 ,_ 7.2
4th atr 11/16/2011 NA NA NA NA
11l 12/5/2011 <1.0 1.800 <1.0 2.9
1st atr 121 2/27/2012 <1.0 2,400 <1.0 16
2nd Qtr 6/6/2012 <1.0 ----3:0oo <1.0 ______
21
3rdQlr 9/4/2012 <1 3,100 <1 31
4th Otr 10/4/2012 <1 1.200 <1 4
1statr 2/11/2013 <1 2.120 <1 9.34
2nd atr 6/5/2013 <1.0 4.030 <1.0 52.4
3rdQtr 9/3/2013 <1.0 2,940 <1.0 ,_ 33.2
4th Ctr 10/29/2013 <1.0 1,410 <1 4.03 .... _
1stQtr 1/27/2014 <1.0 1,400 <1.0 13.8
2nd Qtr 5/19/2014 <1.0 1,960 <1.0 15.4
3rd Qtr 8/11/2014 <1.0 2,120 8.7 26
4th Qtr 10/21/2014 <1.0 _., ... ·--2,090 <1.0 -•..------?I.-.?
1st Ctr 3/9/2015 <1.0 ·1)80 <1.0 27.4
2nd Otr (3) 6/8/2015 <1.0 1,980 <1.0 --------11.2 3rd Qtr ____ 8/31/2015 ----2Jso ------·res <1.0
4thQtr 10/19/2015 <1.0 2,680
1st Qtr 3/9/2016 <1.0 2.650
2nd Otr 5/23/2016 <1.0 2.220
3rd Qlr 7/25/2016 <1.0 3,190
4th Otr (4) 10/12/2016 <1.0 2,510
1st Ctr----3/8/2017 <1.0 _____ ------1290
2nd Ctr 6/13/2017 <1.0 2.450
3rd Qlr 7/26/2017 <1.0 1.230
4th01r 10/11/2017 <1.0 2.570
1st Ctr 3/12/2018 <1.0 1,210
2nd atr 6/8/2018 <1.0 1,870
3rdQtr 8/22/2018 <1.0 1,680
4th0tr 11/28/2018 <1.0 1.480
1st0tr 3/8/2019 <1.0 1,110
2nd Qtr 6/5/2019 <1.0 1.280
3rd Qtr 9/4/2019 <1.0 1.680
4th Qtr 12/10/2019 <1.0 t.390
1stQtr 2/19/2020 <1.0 1,100
2nd Qtr 6/12/2020 <1.0 t.140
3rd Otr 9/4/2020 <1.0 t.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
3rd Qtr 8/24/2021 <1.0 1,580
4thQtr 12/t/2021 <1.0 826
1st0tr 3/9/2022 <1.0 1,030
2nd Otr 6/8/2022 <1.0 611
3rd Otr 8/30/2022 <1.0 612
4thQtr 11/30/2022 <1.0 1.040
1stQtr 3/9/2023 <1.0 571
2nd Qtr 6/13/2023 <1.0 2 230
(1) voes were reumpled because laboratory m15sed holdmg time. (~t As of March 2012 both 'ii$~ south WIid kfe poods no 1()!"19eneceM~ water
j4i~==~=:=•~~\ s::~2~.:'M,1 started in 1114/is:::
NA= not analyzed
Shaded indicat&S concentrations exceedint:i GWOS.
Bold and italics indicates the MDL exceeded the GWQS.
11.6
1.3.? 8.28
<1.0 4.66
<1.0 4.57
<1.0 7.81
<1.0 4.31 <1.0 ------7.65
<1.0 7.59
<1.0 5.26
<1.0 7.83
<1.0 2.14
<1.0 9.19
<1.0 <1.0
<1.0 <1.0
<1.0 2.2
<1.0 1.19
<1.0 1.93
<1.0 1.78
<1.0 <1.0
<1.0 <1.0
<1.0 2.57
<1.0 <1.0
<1.0 3.46
<1.0 <1.0
<1.0 <1.0
5.9 <1.0
<1.0 <1.0
<1.0 <1.0
<1.0 <1 .0
<1.0 <1.0
<1.0 <1.0
2.7 <1.0
Chloride
No GWQS (ma/LI
NA
NA
NA
NA
NA
NA
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
---------J~ 73
73
68
81.9
77.9
60.5
72.3
59.4
53.4
59
60.1
56.5
---------Ji~ 69.6
62.6
68.3
66.2
66.4
--------6g 58.4
64.3
61 .4
62.2
60.3
58.7
91 .4
85.5
69.9
80.7
76.2
83.2
88.9
35.1
70
37.4
59.5
48.6
46.6
84.7
50.2
63.4
57.0
52.1
81
57.6
Nitrate, Nitrate + Nitrite
(10 mail )
NA
NA
NA
NA
NA
NA
0.3
0.
0.
0.
0.
0.
1.
0.
0.
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
1.38
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
3.08
0.977
1.17
2.93
0.42
3.62
0.349
0.81
0.671
0.52
0.3
0.22
0.662
0.337
0.694
0.294
MW-32 {formerTW4.17)
Sampling Event
TABLE 1 (3 of 33)
Historic Summary Of Monitoring Well Analytical Results Up To The 2nd Quarter 2023
Chloroform Contamination Investigation
DUSA White Mesa Mill
Parameter
IGWQSI
Carbon Tetrachloride Chloroform Chloromethane Methylene Chloride Chloride Nitrate, Nitrate + Nitrite
15 ug/L) (70 ug/Ll
1st Qtr 3/1612005 NA <1.0
2nd Otr 5/25/2005 NA <1.0
3rdQtr 8/31/2005 <1.0 <1.0
4th Qtr 12/7/2005 <1.0 <1.0
1stQtr 3/9/2006 <1.0 <1.0
2nd Otr 6/14/2006 <1.0 <1.0
3rdQtr 7/20/2006 <1.0 <1.0
4th Qtr 1118/2006 <1.0 <1.0
1st0tr 2128/2007 <1.0 <1.0
2nd Otr 6/27/2007 <1.0 <1.0
3rd Qtr 8/15/2007 <1.0 <1.0
4th Qtr 10/10/2007 <1.0 <1.0
1st0tr 3/28/2008 <1.0 <1.0
2nd Qtr 6/25/2008 <1.0 <1.0
3rdQtr 9/1012008 <1.0 "-1.0
4th Qtr 10115/2008 <1.0 <1.0
1stQtr 31412009 <1.0 <1.0
2nd Qtr 6123/2009 <1.0 <1.0
3rd Qtr 9/14/2009 <1.0 <1.0
4th Qtr 12116/2009 <1.0 <1.0
1stQtr 2117/20fri <1.0 <1.0
2nd Qtr 6114/2010 <1.0 <1.0
3rd Qtr 8/16/2010 <1.0 <1.0
4th Qtr 10/15/2010 <1.0 <1.0
1statr 2123/2011 <1.0 <1.0
2nd Qtr 5/25/2011 <1.0 <1.0
3rd Qtr 8/18/2011 <1.0 <1.0
4thQtr 11/16/2011 NA NA
(1} 12/7/2011 <1.0 <1.0 1srcm·r2 11181201 2 <1.0 <1.0
2nd Qtr 6/22/2012 <1.0____ --<1.0 ____
3rd Qtr 915/2012 <1.0 <1.0
4th Qtr 10/10/2012 <1.0 <1.0
1st0tr 2111/2013 <1.0 <1.0
2nd Qtr 6118/2013 <1.0 <1.0
3rd Qtr 9/3/2013 <1.0 <1.0
4th Qtr 10/29/201 3 <1.0 <1.0
1stQtr 1/29/2014 <1.0 <1.0
2nd Qtr 512312014 <1.0 <1.0
3rd Qtr 8/26/2014 <1.0 <1.0
4th Qtr 10129/2014 <1.0 <1.0
1st Otr 3/17/2015 <1.0 <1.0
2nd Otr 8/1112015 <1.0 <1.0
3rd Qtr 9/9/2015 <1.0 <1.0
4th Otr 10/28/2015 <1.0 <1.0
1st 0tr 3/2212016 <1.0 <1.0
Duplicate TW4-70 <1.0 <1.0
2nd Qtr 6/8/2016 <1.0 <1.0
Duplicate TW4-70 <1.0 <1.0
3rd Qtr 8119/2016 <1.0 <1 .0
4th Qtr 10/3112016 <1.0 <1.0
1stQtr 312112017 <1.0 <:Lo
2nd Qtr 612112017 <1.0 <1.0
3rdQtr 8/812017 <1.0 <1.0
4th Qtr 1011212017 <1.0 <1.0
1st Otr 3/15/2018 <1.0 <1.0
Duplicate TW4-70 <1.0 <1.0
2nd Qtr 611412018 <1.0 <1.0
3rdQtr 912212018 <1.0 <1.0
4thQtr 1012912018 <1.0 <1.0
1510tr 3/19120-19. <1.0 <1.0
2nd Qtr 6118/2019 <1.0 <1.0
3rdQtr 9/11/2019 <1.0 <1.0
4thQtr 12118/2019 <1.0 <1.0
1-s1·01r 3/18/2020 <1.0 <1.0
DuplicateTW4-75 <1.0 <1.0
2nd Otr 611212020 <1.0 <1.0
3rd Qtr 9/1812020 <1.0 <1.0
4th Qtr 11/412020 <1.0 <1.0
Q!:!p"l!Ei!e TW4-65 <1.0 <1.0
1stQtr 3118/2021 <1.0 <1.0
Duplicate TW4-75 <1.0 <1.0
2nd Qtr 6117/2021 <1.0 <1.0
Duplicate TW4-75 <1.0 <1.0
3rd Qtr 9/23/2021 <1.0 <1.0
Duplicate TW4-75 <1.0 <1.0
4th Qtr 1219/2021 <1.0 <1.0
1st0tr 3/2212022 <1.0 <1.0
2nd Otr 6/1612022 <1.0 <1.0
3rd Qtr 9/1512022 <1.0 <1.0
4th Qtr 121812022 <1.0 <1.0
1st0tr 3/30/2023 <1.0 <1.0
2nd Otr 6/1612022 <1.0 <1.0
(1) voes were resampled because laboratory missed holding time
(2) As of Ma1ch 2012 both north and south wild hfe ponds no longer receMng water
NA = not analyzed
Shaded indicates concentrations exceeding GWOS
130 ug/L) 15 µg/L) No GWQS lmg/L) 110 mo/L)
NA NA NA <0.1
NA NA NA <0.1
3.2 <1.0 NA <0.1
<1.0 <1.0 33 <0.1
<1.0 <1.0 32 <0.1
3.5 <1.0 30 <0.1
1.8 <1.0 32 <1.0
1.5 <1.0 31 <.1
<1.0 <1.0 32 <1.0
<1.0 <1.0 32 <1.0
<1.0 <1.0 31 <1.0
<1.0 <1.0 32 <1.0
<1.0 <1.0 31 <.1
<1.0 <1.0 29 <1.0
<1.0 <1.0 30 <1.0
<1.0 <1.0 26 <0.05
<1.0 .. 1.0 30 <.1
<1.0 <1.0 31 <0.1
<1.0 <1.0 33 <0.1
<1.0 <1.0 35 <0.1
<1.0 <1.0 38 <0.1
<1.0 <1.0 32 <0.1
<1.0 <1.0 28 <0.1
<1.0 <1.0 24 <0.1
<1.0 <1.0 40 <0.1
<1.0 <1.0 31 <0.1
<1.0 <1.0 33 <0.1
NA NA 32 <0.1
<1.0 <1.0 NA NA
<1.0 <1.0 21 <0.1 <T O ______
<1.0
_________ ,
<0.1 32
<1.0 <1.0 33 "-0.1
<1.0 <1.0 35 <0.1
<1.0 <1.0 34.3 <0.1
<1.0 <1.0 34.9 <0.1
<1.0 <1.0 33 <0.1
<1.0 <1.0 35.7 <0.1 ·-----<1.0 <1.0 34 <0.1
<1.0 <1.0 39.7 <0.1
<1.0 <1.0 34 <0.1
<1.0 <1.0 34.9 <0.1
<1.0 <1.0 36.3 <0.1
<1.0 <1.0 35.8 <0.1
<1.0 <1.0 37.7 <0.1
<1.0 <1.0 34.7 <0.1
<1.0 <1.0 36.7 <0.1
<1.0 <1.0 37.7 0.119
<1.0 <1.0 36.4 <0.1
<1.0 <1.0 37.7 <0.1
<1.0 <1.0 35.7 <0.1
<1.0 <1.0 36.9 <0.1
<1.0 <1.0 33.7 <0.1
<1.0 <1.0 37.2 <0.1
<1.0 <1.0 38.1 <0.1
<1.0 <1.0 32~ <0.1
<1.0 <1.0 39.4 <0.1
<1.0 <1.0 39.3 <0.1
<1.0 <1.0 34.4 <0.1
<1.0 <1.0 41 .2 <0.1
<1.0 <1.0 32.9 <0.1
<1.0 <1.0 35.3 <0.1
<1.0 <1.0 36.5 <0.1
<1.0 <1.0 41.2 <0.1
<1.0 <1.0 36.3 <0.1
<1.0 <1.0 36 <0.1
<1.0 <1.0 34.8 <0.1
<1.0 <1.0 35.6 <0.1
<1.0 <1.0 34.7 <0.1
<1.0 <1.0 31.3 <0.1
<1.0 <1.0 35.9 <0.1
<1.0 <1.0 36.8 '<0.1
<1.0 <1.0 37.4 <0.1
<1.0 <1.0 35.8 <0.1
<1.0 <1.0 34.3 <0.1
<1.0 <1.0 35.3 <0.1
<1.0 <1.0 35.5 <0.1
<1.0 <1.0 35.8 <0.1
<1.0 <1.0 28.6 <0.1
<1.0 <1.0 26.9 <0.1
<1.0 <1.0 37.2 <0.1
<1.0 <1.0 35.1 <0.1
<1.0 <1.0 36.8 <0.1
<1.0 <1.0 36.8 <0.1
TW4• 1 (Chloroform p!Jmp+ng well
stsrteou,1114115)
Sampling Event
1st Qtr 3/16/2005
2nd Qtr 5/25/2005
3rd Qtr 8/31/2005
4th Qtr 12/7/2005
1st Qtr 3/9/2006
2nd Qtr 6/14/2006
3rdQtr 7/20/2006
4th Qtr 11/8/2006
1st Qtr 2128/2007
2nd Ctr 6/27/2007
3rdQtr 8/15/2007
4th Qtr 10/10/2007
1st Otr 3/28/2008
2nd Otr 6/25/2008
3rd Qtr 9/10/2008
4th Qtr 10/15/2008
1st Qtr 3/11/2009
2nd Qtr 6/23/2009
3rd Qtr 9/14/2009
4th Qtr 12129/2009
1st Ctr 3/3/2010
2nd Otr 6/14/2010
3rd Ctr 8/18/2010
4th Qtr 10/15/2010
1stOtr 2124/201 1
2nd Otr 6/1/2011
3rd Qtr 8/18/2011
4th Otr 11/29/2011
lsf0fr(2) 1124/2012
2nd Qtr 6/14/2012
3rd Qtr 9/28/2012
4th Qtr 10/4/2012
1st Qlr 2113/2013
2nd Qtr 6/19/2013
3rd Otr 9/3/2013
4th Otr 11/14/2013
1stQtr 215/2014
2nd Otr 5/23/2014
3rd Qtr 8/27/2014 4th Qlr ____ 10/29/2014
1stQlr (2) 3/9/2015
2nd Otr 6/8/2015
3rd Otr 8/31/2015
4th Qlr 10/19/2015
1stQtr 3/9/2016
2nd Qtr 5/23/2016
3rdQlr 7/25/2016
4th Qtr 10/13/2016
1stQtr 3/8/2017
2nd Qtr 6/13/2017
3rd Qtr 7/26/2017
4th Qtr 10/11/2017
TABLE 1 (4 of 33)
Historic Summary Of Monitoring Well Analytical Results Up To The 2nd Quarter 2023
Chlorofonn Contamination Investigation
OUSA White Mesa Mill
Parameter
IGWQSI
Carbon Tetrachloride Chloroform Chloromethane Methylene Chloride Chloride
15 ug/L) 170 uo/LI 130 ug/L) 15 µg/L) No GWQS (mg/LI
NA 2,700 NA NA NA
NA 3,080 NA NA NA
<10 2,900 <10 <10 NA
<50 2,400 <50 <50 52
<50 2,700 <50 <50 49
<50 2,200 <50 <50 48
<50 2,840 <50 <50 51
1.4 2,260 <1.0 <1.0 47
1.2 1,900 <1.0 <1.0 47
1.4 1,900 <1.0 <1.0 45
1.3 2,300 <1.0 <1.0 43
1.3 2,000 <1.0 <1.0 43
1.3 2,000 <1.0 <1.0 39
1.1 1,900 <1.0 <1.0 39
1.3 1,700 <1.0 <1.0 35
1.3 1,700 <1.0 <1.0 41
1.1 1,700 <1.0 <1.0 37
1 1,500 <1.0 <1.0 37
<1.0 1,700 <1.0 <1.0 36
<1.0 1,400 <1.0 <1.0 41
<1.0 1,300 <f.o--<1.0 35
1.2 1,600 <1.0 <1.0 40
1 1.600 <1.0 <1.0 35
<1.0 1,500 <1.0 <1.0 40 ~-1.o 1,300 <1.0 <1.0 41
<1.0 1,200 <1.0 <1.0 35
<1.0 1.300 <1.0 <1.0 36
<1.0 1,500 <1.0 <1.0 40
<1.0 1,300 <1.0 "<fO 38
<1.0 ---1:000 <1.0 ______ <1.0 ---------■ 42
<1.0 1,000 <1.0 <1.0 39
<1.0 1,100 <1.0 <1.0 40
3.66 1,320 <1.0 <1.0 37.6
<1.0 1.100 <1.0 <1.0 39.1
<1.0 1,150 <1.0 <1.0 37.6
<1.0 1,280 <1.0 <1.0 36.5
5.47 1.cfilo <1.0 <1.0 38.9
4.77 1,020 <1.0 <1.0 37.4
<1.0 845 1.4 <1.0 38 <1.0 _________ ___ JJ~ ~-.Q. ______ <1.0 ________ --------38_7 _
<1.0 1,130 <1.0 <1.0 38.3
<1.0 1,260 <1.0 <1.0 40.3
<1.0 1,060 <1.0 <1.0 45.9
<1.0 1,040 <1.0 <1.0 38.5
<1.0 974 <1.0 <1.0 41.7
<1.0 1,140 <1.0 <1.0 44.4
<1.0 1,160 <1.0 <1.0 44.7
<1.0 1,330 <1.0 <1.0 44.2
<1.0 519 <1.0 <1.0 41.5
<1.0 977 <1.0 <1.0 41 .8
<1.0 958 <1.0 <1.0 42.8
<1.0 556 <1.0 <1.0 38.5
Nitrate, Nitrate + Nitrite
110 mg/L)
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 1s
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
rrt;Mf !3-"'P-~3Tal20Ta <7.6 810 <12 23 J 42 ··-_ 0.17
<1.0 70.4
2nd Qtr 6/8/2018
<1.0 _________ ----942
3rd Qtr 8/2212018 <1.0 1,010
4th Qlr 10/2212018 <1.0 752
DWMRC spl~ s_am~ <5.0 210
1stOtr 3/8/2019 <1.0 87.2
2nd Qtr 6/5/2019 <1.0 1,040
3rdQtr 9/4/2019 <1.0 894
41h Qlr 12110/2019 <1.0 1,070
1statr 2119/2020 <-:f~o 1,190
2nd Qtr 5/27/2020 <1.0 499
3rd Qtr 9/4/2020 <1.0 1,060
4th Qtr 10/28/2020 <1.0 924
1stQtr 2123/2021 <1.0 948
2nd Qtr 6/9/2021 <1.0 957
3rdQtr 8/24/2021 <1.0 821
4th Qtr 1211/2021 <1.0 957
1statr 3/9/2022 <1.0 946
2nd Qtr 6/8/2022 <1.0 914
3rdQtr 8/30/2022 <1.0 954
4th Qtr 11/30/2022 <1.0 1,010
1stQtr 3n /2023 <1.0 928
2nd Qtr 6/13/2023 <1.0 830
(1) Asot March 2012 both north and southw,ld IJfe ponds no~ receiving water
(2) TW4-1 converted to a chloroform pu~!!P well started in 1/14/15
(~ chloroform P,·Una"i. welt TW4-41 started m May 2018 __ •
NA = not analyzed
Shaded indicates concentrations exceeding GWQS
Bold and italics indicates the MDL exceeded the GWQS
J = Approximated value
<1.0 <1.0 45.8 4.84 <TO ______ <1.0 ----------4.38 42.0
<1.0 <1.0 47.3 4.30
<1.0 <1.0 43.2 4,57
<5.0 <5.0 NA 0.46
<1.0 <1.0 40.9 4.51
<1.0 <1.0 44.8 1.43
<1.0 <1.0 46 1.65
<1.0 <1.0 44.2 3.91
<1.0 <1.0 47,5 4.67
<1.0 <1.0 46,4 0.44
<1.0 <1.0 43.7 2.22
<1.0 <1.0 41 .9 4.30
<1.0 <1.0 45.4 2.72
<1.0 <1.0 37.2 0.73
1.18 <1.0 44.8 1.38
<1.0 <1.0 45.5 4.37
<1.0 <1.0 42.6 3.90
<1.0 <1.0 45.5 0.18
<1.0 <1.0 45.1 0.42
<1.0 <1.0 38.3 3.62
<1.0 <1.0 43.8 (ii
1.1 <1.0 42.5 3.87
TW4•2 {cnlofofo,m pumping ~I
start1ng1114/15)
Sampling Event
TABLE 1 (5 of 33)
Historic Summary Of Monitoring Well Analytical Results Up To The 2nd Quarter 2023
Chlorofonn Contamination Investigation
OUSA White Mesa Mill
Parameter
(GWQS)
Carbon Tetrachloride Chlorofonn Chloromethane Methylene Chloride Chloride
(5 "g/L) (70 •o!Ll (30 "g/L) (5 "g/L) No GWQS (mg/L)
1stQtr 3/16/2005 NA 3,700 NA NA NA
2nd Qtr 5/25/2005 NA 3,750 NA NA NA
3rdQtr 8/31/2005 <10 3,900 <10 <10 NA
4th Qtr 12/7/2005 <50 3,500 <SO <SO 56
1stQtr 3/9/2006 <SO 3,800 <SO <SO 56
2nd Otr 6/14/2006 <50 3,200 <50 <50 56
3rd Qtr 7/20/2006 <50 4,120 <SO <50 54
4th Qtr 11/8/2006 2.3 3,420 <1.0 <1.0 55 15:i"atr 2/28/2007 1.8 2,300 <1.0 <1.0 54
2nd Qtr 6/27/2007 2.5 3,000 <1.0 <1.0 50
3rd Qtr 8/15/2007 2.2 340 <1.0 <1.0 49
4th Qtr 10/10/2007 2.1 3,200 <1.0 <1.0 51
1st0tr 3/28/2008 2.3 3,300 <1.0 <1.0 48
2nd Qtr 612512008 2.2 3,100 <1.0 <1.0 46
3rd Qtr 9110/2008 2.4 2,800 <1.0 <1.0 42
4th Qtr 10115/2008 NA #N/A NA NA 47
11/18/2008 2.4 3,200 <2.0 <2.0 ·-NA ________
1st Otr 3/11/2009 2.2 -·:i'.ioo "<1.0 <1.0 46
2nd Qtr 6/2312009 2 2,800 <1.0 <1.0 44
3rd Qtr 9/14/2009 2 3,000 <1.0 <1.0 43
4th Qtr 12/29/2009 2 1.600 <1.0 <1.0 46 ... 1stQtr 3/3/2010 2 2,600 <1.0 <1.0 42
2nd Qtr 6/14/2010 2.6 3.300 <1.0 <1.0 43
3rd Qtr 8/18/2010 2.5 3.300 <1.0 <1.0 43
4th Qtr 10/15/2010 2.1 3,000 <1.0 <1.0 41
1stQtr 2/24/20ff 2.4 3,100 <1.0 <1.0 46
2nd Qtr 6/2/2011 2.2 3,000 <1.0 <1.0 42
3rd Qtr 8/1712011 1.6 2.400 <1.0 <1.0 48
4th Qtr 1112912011 2.8 3,900 <1.0 <1.0 49 lsfOfrT21 112412012 2 2,500 <T.O .<.1.0 49
2nd Qtr 6/14/2012 2.1 ---2 ]00 <TO ______ <1.0------------52
3rd Qtr 91412012 1.8 2,900 <1.0 <1.0 76
4th Qtr 10/4/2012 2 3,100 <1.0 <1.0 49
1stOtr 2/13/2013 5.17 3,580 <1.0 <1.0 46
2nd Qtr 6119/2013 2.65 3,110 2 <1.0 46.9
3rd Otr 9/3/2013 2.41 3.480
4th Qtr 11/14/2013 3.15 3,740
1st Qtr 2/6/2014 7.1 3,180
2nd Otr 512312014 6.05 2,930
3rd Qtr 812712014 1.4 3,170
4th Qtr 10/30/2014 2.6 3,580
1st Qtr (2) 319/2015 1.44 ---,:s,ro
2nd Otr 61812015 <1.0 1,650
3rd Qtr 8/3112015 <1.0 1,060
4th Qtr 10/19/2015 2.6 2,070
1stQtr 319/2016 1.2 1,970
2nd Qtr 5/23/2016 1.49 2.070
3rd Qtr 7/25/2016 <1.0 1,780
4th Qtr 10/12/2016 <1.0 1,600
1stQtr 3i8i2lff7 <1.0 1,570
2nd Qtr 6/1312017 <1.0 1,940
3rd Qtr 7126/2017 <1.0 1.310
4th Qtr 10/11/2017 <1.0 1,610
DWMRC split sample <19 1,200
DWMRC du licate TW4-50 <19 1,200
1stQtr 3112/2018 <1.0 764
2nd Qtr 61812018 <1.0 949
3rd Qtr 8122/2018 <1.0 980
4th Qtr 10122/2018 <1.0 822
1statr 31812019 <1.0 1.040
2nd Otr 615/2019 <1.0 1,360
3rd Qtr 914/2019 <1.0 797
4th Qtr 12/10/2019 <1.0 934
1statr 2/19/2020 <1.0 1,880
2nd Otr 6/10/2020 <1.0 1,070
3rdQtr 9/4/2020 <1.0 1.260
4th Otr 10/28/2020 <1.0 1,130
1Sta1r -----•·-·2123/2O:ii <1.0 939
2nd Qtr 61912021 <1.0 1,160
3rd Qtr 8/2412021 <1.0 1.150
4thQtr 12/112021 <1.0 852
1stQtr 3/1712022 <1.0 1,020
2nd Qtr 618/2022 <1.0 892
3rd Qtr 8130/2022 <1.0 832
4th Qtr 11130/2022 <1.0 1,030
1st Qtr 3ni2023 <1 .0 772
2nd Otr 6/1312023 <1.0 788
(1) As of March 2012 both north and south wild life ponds no ~r receiving water
(2) TW4•2 and TW4•11 converted to a chlorofO!'m pumpi29;:ve11 started 1n 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 44.9
<1.0 <1.0 43.9
<1.0 <1.0 45.9
<1.0 <1.0 45.4
3.6 <1.0 45
<1.0 <1.0 45_5 <1.0 ______
<1.0 44_9
<1.0 <1.0 48.1
2.6 <1.0 50
<1.0 <1.0 41.9
<1.0 <1.0 43.4
<1.0 <1.0 43.8
<1.0 <1.0 42.9
<1.0 <1.0 44.3
<1.0 <1.0 43.1
<1.0 <1.0 43.6
<1.0 <1.0 43.2
<1.0 <1.0 43.5
<30 68 J 44
<30 60 J 43
<1.0 <1.0 44.4
<1.0 <1.0 41 .3
<1.0 <1.0 44.3
<1.0 <1.0 41-7
<1.0 <1.0 40.4
<1.0 <1.0 39.8
<1.0 <1.0 40.8
<1.0 <1 .0 41 .5
<1.0 <1.0 42.1
<1.0 <1.0 40.6
<1.0 <1.0 41 .3
<1.0 <1.0 38.7
<1.0 <1.0 43.3
<1.0 <1.0 32.5
<1.0 <1.0 36.8
<1.0 <1.0 41 .9
<1.0 <1.0 36.7
<1.0 <1.0 39.5
<1.0 <1.0 40.7
<1.0 <1.0 35_5
<1.0 <1.0 41.4
1.2 <1.0 38.1
Nitrate, Nitrate + Nitrite
(10ma/Ll
7.7
8.6
8.0
7.8
7.5
7.1
7.4
7.6
7.3
7.8
7.3
6.9
6.9
7.4
7.1
8.0
#N/A
6.5
6.4
6.6
6.4
6.8
8.7
6.6
6.5 -7.0
6.8
6.0
7.0
7.1
7_7
4.0
7.6
8.1
7.51
9.3
8.39 --··-Yai
9.11
6.2
8.45
5.32
4.3
3.76
5.18
5.30
5.67
4.07
6.07
4.74
4.90
5.08
3.25
4.00
5.00
2.94
3.50
4.83
3.52
3.92
4.38
4.79
3.40
6.07
3.62
3.35
2.34 --IIo
3.89
1.97
3.49
3.3
3.1
3.07
3.74
2.03
3_7
TABLE 1 (6 of 33)
Historic Summary Of Monitoring Well Analytical Results Up To The 2nd Quarter 2023
Chlorofonn Contamination Investigation
DUSA White Mesa Mill
TW4-3 Parameter
Sampling Event /GWQSI
Carbon Tetrachloride Chlorofonn Chloromethane Me1hylene Chloride Chloride Nitrate, Nitrate + Nitrite
(Spoil) (70 uo/LI 130 uo/L) (Spg/L) No GWQS (mg/L) (10ma/LI
1stQtr 3/16/2005 NA <1.0 NA NA NA 3.5
2ndQtr 5/25/2005 NA <1.0 NA NA NA 3.7
3rdQtr 8/31/2005 <1.0 <1.0 6.4 <1.0 NA 3.5
4th Qtr 1217/2005 <1.0 <1.0 <1.0 <1.0 26 3.3
1stQtr 3/9/2006 <1.0 "<1.0 2.3 <1.0 26 3.3
2nd atr 6/14/2006 <1.0 <1.0 1.6 <1.0 26 7.1
3rd Qtr 7/20/2006 <1.0 <1.0 2.2 <1.0 26 2.9
4thQtr 11/8/2006 <1.0 <1.0 ......................... <1.0 <1.0 ········ ··········-·23 '-·--·· 1'
1stQtr 2/28/2007 <1.0 <1.o "<1-:-Cf""""'''''' <1.0 22 3.
2ndQtr 6/27/2007 <1.0 <1.0 <1.0 <1.0 23 3.3
3rd Qtr 8/15/2007 <1.0 <1.0 <1.0 <1.0 24 3.1
4thQtr 10/10/2007 <1.0 <1.0 ··-<1.0 <1.0 27 2.8
1stQtr 3/28/2008 "<1.0 <·fa <1.0 <1.0 . 21 .. 20i1
2ndQtr 6/25/2008 <1.0 <1.0 <1.0 <1.0 19 2.9
3rdQtr 9/10/2008 <1.0 <1.0 <1.0 <1.0 19 2.7
4th Qtr 10/15/2008 <1.0 <1.0 <1.0 <1.0 22 2.6
1st Qtr 3/4/2009 <1.0 <1.0 <1.0 <1.0 21 2.5
2ndQtr 6/23/2009 <1.0 <1.0 <1.0 <1.0 20 2.9
3rd Qtr 9/14/2009 <1.0 <1.0 <1.0 <1.0 21 2.8
4th Qtr 12/29/2009 <1.0 <1.0 <1.0 <1.0 .. 22 2.6
1stQtr 2/23/2010 . <1.0 <1.0 <1.0 <1.0 23 2.8
2nd Qtr 6/14/2010 <1.0 <1.0 <1.0 <1.0 24 3.0
3rdQtr 8/10/2010 <1.0 <1.0 <1.0 <1.0 22 3.1
4th Qtr 10/15/2010 <1.0 <1.0 <1.0 <1.0 26 3.3
1stQtr 2/15/2011 . <1.0 <1.0 <1.0 <{O 23 3.5
2nd Qtr 5/25/2011 <1.0 <1.0 <1.0 <1.0 23 3.7
3rd Qtr 8/17/2011 <1.0 <1.0 <1.0 <1.0 23 4.0
4thQtr 11/14/2011 <1.0 <1.0 ,. .............. -... <1.0 <1.0 23 4.4
lsf0fr(2L _ 111112012 <1.0 <f0 <1.0 <1.0 --------· J! -----------7.1 -----------<1.0 ____ <1.0 ______ <1.0 -2nd Ctr 5/31/2012 <1.0 24 4.4
3rdQtr 8/28/2012 <1.0 <1.0 <1.0 <1.0 25 4.9
4th Qtr 10/3/2012 <1.0 <1.0 ................ <1.0 <1.0 2§, .... 4.8
1stQtr 217/2013 <1.0 ·<1.0 <1.0 <1.0 23.7 ..s:os
2nd Qtr 6/28/2013 <1.0 <1.0 <1.0 <1.0 23.8 5.83
3rd Qtr 9/3/2013 <1.0 <1.0 <1.0 <1.0 25 4.90
4thQtr 11/8/2013 <1.0 <1.0 <1.0 <1.0 24.1 5.89
1stQtr 1i221201·4 '<"1.0 <1.0 <1.0 <1.0 24.9 6.66
2nd Qtr 5/21/2014 <1.0 <1.0 <1.0 <1.0 24.4 6.01
3rdQtr 8/13/2014 <1.0 <1.0 <1.0 <1.0 26 5.30
4th Qtr 10/23/2014 <1.0 <1.0 <1.0 <1.0 26.7 .. ~m
1st Qtr 3/11/2015 ·<i:·o <1.0 <1.0 <1.0 26.2 6.64
2ndQtr 6/10/2015 <1.0 <1.0 <1.0 <1.0 27.5 5.71
Duplicate TW4-65 <1.0 <1.0 <1.0 <1.0 27.5 3.94
3rd Qtr 8/13/2015 <1.0 <1.0 <1.0 <1.0 27.4 3.88
4th Qtr 10/21/2015 <1.0 <1.0 <1.0 <1.0 25.6 5.37
isicitr ········--·····-······ 3/1512016 < .. To <1.0 <1.0 <1.0 3Ts 5.83
2nd Qtr 5/25/2016 <1.0 <1.0 <1.0 <1.0 27.9 5.65
3rdQtr 7/27/2016 <1.0 <1.0 <1.0 <1.0 26.5 6.10
4th Qtr 1~~:ii~1 <1.0 <1.0 <1.0 <1.0 ··-·--·-······--·--29.5 6.00
1stQtr <i'.O <1.0 <·1.0 <1.0 28.1 a:18
2nd Qtr 6/14/2017 <1.0 <1.0 <1.0 <1.0 28.7 6.36
3rd Qtr 7/27/2017 <1.0 <1.0 <1.0 <1.0 28.5 6.36
Duplicate TW4-65 <1.0 <1.0 <1.0 <1.0 28.9 6.24
114th Qtr 10/11/2017 <1.0 <1.0 <1.0 <1.0 25.9 6.32
111st Qtr 3/14/2018 <1.0 <1.0 <1.0 <1.0 .. 29.8 6.46
Duplicate TW4-65 <1.0 <1.0 <1.0 <1.0 29.5 6.31
112ndQtr 6/8/2018 <1.0 <1.0 <1.0 <1.0 26.1 6.52
3rdQtr 8/29/2018 <1.0 <1.0 <1.0 <1.0 31.0 5.53
Duplicate TW4-65 <1.0 <1.0 <1.0 <1.0 31.0 5.44
i4th Qtr 11/30/2018 <1.0 <1.0 <1.0 <1.0 27.4 5.85
D1:1P.!!Cate TW4-65 <1.0 <1.0 <1.0 <1.0 26.2 ············ 5.77 1st Qtr 3/13/2019 <1.0 <1.0 <1.0 <1.0 25g······ 5.82
2nd Qtr 6/13/2019 <1.0 <1.0 <1.0 <1.0 27.4 6.68
Duplicate TW4-65 <1.0 <1.0 <1.0 <1.0 25.9 6.60
3rd Qtr 9/11/2019 <1.0 <1.0 <1.0 <1.0 26.0 5.12
Duplicate TW4-65 <1.0 <1.0 <1.0 <1.0 22.1 5.76
4th Qtr 12/12/2019 <1.0 <1.0 <1.0 <1.0 28 5.91
1stQtr 3117/2020 ·<1.0 <1.0 <1.0 <1.0 2i"i 6.15
Duplicate TW4-65 <1.0 <1.0 <1.0 <1.0 26 6.38
2nd Qtr 6/10/2020 <1.0 <1.0 <1.0 <1.0 26.2 6.53
Duplicate TW4-65 <1.0 <1.0 <1.0 <1.0 26.7 6.63
3rd Qtr 9/17/2020 <1.0 <1.0 <1.0 <1.0 25.9 6.36
4th Qtr 11/4/2020 <1.0 <1.0 <1.0 <1.0 24.9 6.02
1stQtr .......... ··-····-· 3/17/2021· <1.0 <1:-C> <1.0 <1.0 28.4 s:10
DuplicateTW4-65 <1.0 <1.0 <1.0 <1.0 27.6 6.64
2nd Qtr 6/15/2021 <1.0 <1.0 <1.0 <1.0 27 8.04
Dupl~te TW4-65 <1.0 <1.0 <1.0 <1.0 23.9 7.89
3rdQtr 9/15/2021 <1.0 <1.0 <1.0 <1.0 20.3 5.28
Duplicate TW4-65 <1.0 <1.0 <1.0 <1.0 20.7 6.19
4th Qtr 1217/2021 <1.0 <1.0 <1.0 <1.0 26.2 5.97
D~P.!.icate TW4-65 <1.0 <1.0 <1.0 <1.0 26.4 6.55
1stQtr 3/15/2022 <1.0 <1.0 ...... ·<1.0 <1.0 24.:i .. e:1
2nd Qtr 6/15/2022 <1.0 <1.0 <1.0 <1.0 26.7 5.8
3rd Qtr 9/13/2022 <1.0 <1.0 <1.0 <1.0 27.3 5.47
4th Qtr 11/30/2022 <1.0 <1.0 <1.0 <1.0 21.5 6.64
1statr 3/22/2023 <1.0 <1·:o <1.0 <1.0 20.6 6.1
2nd Qtr 6/15/2023 <1.0 <1.0 <1.0 <1.0 23.5 6.4
NA= not analyzed
Shaded indicates concentrations exceec:linR GWQS
TABLE 1 (7 of 33)
Historic Summary Of Monitoring Well Analytical Results Up To The 2nd Quarter 2023
Chloroform Contamination Investigation
TW4-4 (chk:lfof0<m pumping well
st11redl111&tqtr2010)
Sampling Event
Carbon Tetrachloride Chloroform
(5 "g/L) (70 un/LI
1st Qtr 3/16/2005 NA 3,100
2nd Qtr 5/25/2005 NA 2,400
3rd Qtr 8/31/2005 <10 3,200
4th Qtr 12/7/2005 <50 2,800
1st Qtr 3/9/2006 <50 2,900
2nd Qtr 6/14/2006 <50 2,600
3rdQtr 7120/2006 <50 2,850
4th Qtr 11/8/2006 1.7 2,670
1st0tr 2/28/2007 1.5 2,200
2nd Otr 6/27/2007 1.7 2,400
3rd Qtr 8/15/2007 1.5 2.700
4th Qtr 10/10/2007 1.5 2,500 H•-•••-1st0tr 3/28/2008 1.6 2:eoo
2nd Qtr 6/25/2008 1.5 2,500
3rd Qtr 9/1012008 1.4 2,200
4th Qtr 10/1512008 NA #N/A
1st Qtr 11/1812008 <2.0 2,500
1st Qtr 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
1st Qtr (2) 2/17/2010 -1 ---,;oo
2nd Qtr 6/14/2010 1.2 1,700
3rd Qtr 8/10/2010 1.3 2,100
4th Qtr 10/15/2010 1.3 1.700
1st0tr 2/23/2011 1.4 1,800
2nd Otr 6/1/2011 1.2 1,700
3rd Qtr 8/17/2011 <1.0 1,500
4th Qtr 11/16/2011 1 1,500
1stOiT{tL _ 112312012 <1.0 _________ 1,200
2nd Qtr 6/6/2012 <1.0 ---,:soo
3rd Qtr 9/4/2012 1.2 1,600
4thQtr 10/3/2012 1 1,400
1st Qtr 2/11/2013 1 1,460
2nd Otr 6/29/2013 <1.0 1,330
3rd Qtr 9/3/2013 1.2 1,380
4th Qtr 10/23/2013 5.3 1,360
1st Qtr 112712014 3.88 1,260
2nd Qtr 5119/2014 4.94 1,220
3rd Qtr 8111/2014 4.94 1,320
4th Qtr 10121/2014 <1.0 1,130
1st Qtr (4) 3/9/2015 1.05 ---,~50
2nd Qtr 6/10/2015 <1.0 1,280
3rdQtr 8/31/2015 <1.0 1,220
4th Qtr 10/19/2015 <1.0 1,190
1stOtr 3/9/2016 <1.0 1,190
2nd Otr 5123/2016 1.21 1,780
3rd Otr 7127/2016 <1.0 1,380
4th Qtr 10/13/2016 <1.0 1,430
1stQtr 3/8/2017 <1.0 1:iifo
2nd Qtr 6/13/2017 <1.0 1,290
3rd Qtr 7/26/2017 <1 .0 1,290
4th Qtr 10/11/2017 <1.0 1,120
1st Qtr 3/12/2018 <1.0 1:1so
2nd Qtr (3) 6/8/2018 <1.0 ---,:oso
3rd Qtr 8/22/2018 <1 .0 1,030
4th Qtr 11/28/2018 <1.0 1,140
1stOtr 3/8/2019 <1.0 1.050
2nd Otr 6/5/2019 <1.0 1,070
3rd Otr 9/4/2019 <1.0 989
4th Qtr 12/10/2019 <1.0 1,140
1stOtr 2/19/2020 <1.0 1,100
2nd Otr 5/27/2020 <1.0 1.140
3rd Qtr 914/2020 <1.0 1,110
4th Qtr 10/28/2020 <1.0 979
1stQtr 2/23/2021 -,c··1.·o 1,130
2nd Qtr 619/2021 <1.0 1,240
3rd Qtr 8/24/2021 <1.0 1,100
4th Qtr 12/1/2021 <1.0 950
1-Statr 3/9/2022 <1.0 1,010
2nd Qtr 6/8/2022 <1.0 1,110
3rd Otr 8/30/2022 <1.0 1,040
4th Qtr 11/30/2022 <1.0 1030
1stOtr 3ni2023 <1.0 945
2nd Qtr 6/13/2023 <1.0 1 980
(1) As of March 2012 both north and south wild hfe ponds n{~ 1()09en ece1v11~ water
(2) lW4-4 converted to a Chlofoform pu~Plffil weU stared in 1st qtr 2010 ___ • (3l TW4-41 installed as a Chloroform pu'l!PIJ19_wen stared 1n MaL2018 ____ _ (!l lW4-2 convertedtoachloroformpum..,E"~::::'811 started 1n 1/14115 _____ _
NA and #NIA(for graph use)= not analyzed
Shaded indicates concentrations exceeding GWOS.
Bold and italics indicates the MDL exceeded the GWQS.
DUSA White Mesa Mill
Parameter
IGWQSI
Chloromethane Methylene Chloride Chloride
(30 uo/L) (5 uo/L) No GWQS (mn/L)
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-.:9 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 ---------:!! <1.0 ______ <1.0 ----48
<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 ---------)~ <1_0 ______
<1 .0 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 ---------j~ <1.0 ______ <1.0 ________
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 ________ 4E <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
<1.0 <1.0 39.9
<1.0 <1.0 41.0
<1.0 <1.0 29.6
<1.0 <1.0 30.2
1.9 <1.0 39.7
Nitrate, Nitrate + Nitrite
(10mn/L)
10.0
11.3
9.
10.
9.
8.
9.
10,
9.
9.
9.
9.
9.
10.
8.
10.
#N/A
10.
8.
8,
-----------7. 6.
7.
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
667
7.06
6.47
6.90 ___________ 6.12
6.34
6.10
6.02
7.26
10.40
6.32
6.52
4.58
7.26
7.04
6.77
6.75
9.02
4.00
7.32
6.6
6.0
6.65
6.59
7.12
6.28
TABLE 1 (8 of 33)
Historic Summary Of Monitoring Well Analytical Results Up To The 2nd Quarter 2023
Chloroform Contamination Investigation
DUSA White Mesa Mill
TW4-5 Parameter
Sampling Event IGWQSl
Carbon Tetrachloride Chloroform Chloromethane Methylene Chloride Chloride
(5 ua/L) (70 ua/Ll (30 "g/L) 15 "a/LI No GWQS (mg/L)
1st0tr 3/16/2005 NA 120 NA NA NA
2nd Qtr 5/25/2005 NA 113 NA NA NA
3rd Qlr 8/31/2005 <2.5 82 5.8 <2.5 NA
4th Qtr 1217/2005 <2.5 63 2.5 <2.5 56
1stQtr 3/9/2006 . <i"S 66 3.1 <2.5 52
2nd Qtr 6/14/2006 <2.5 5t 3.1 <2.5 5t
3rd Qlr 7/20/2006 <1.0 53.7 <1.0 <1.0 54
4th Qtr 11/8/2006 <1.0 47.t <1.0 <1.0 55 ·1st·a1r 2128/2007 <1.0 35 <1.0 <1.0 57
2nd Otr 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
1stQtr 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
3rd Qtr 9/10/2008 <1.0 1t <1.0 <1.0 34
4th Qtr 10/15/2008 <1.0 10 <1.0 <1.0 37
1st Ctr 3/4/2009 <1.0 12 <1.0 <1.0 34
2nd Otr 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 12129/2009 <1.0 8.5 <1.0 <1.0 41
1st Ctr 2125/2010 <1.0 13 <1.0 <1.0 43
2nd Ctr 6/14/2010 <1.0 12 <1.0 <1.0 28
3rd Ctr 8/11/2010 <1.0 12 <1.0 <1.0 38
4th Qtr 10/15/2010 <1.0 11 <1.0 <1.0 41
1st Ctr 212212011 <1.0 10 <1.0 <1.0 34
2nd Ctr 5/26/2011 <1.0 9 <1.0 <1.0 35
3rdQtr 8nt2011 <1.0 10 <1.0 <1.0 37
4th Qtr 11/16/2011 NA #N/A NA NA 30 (1t ··--····1217/2011 ~.1.0 7.9 <1.0 <1.0 NA
ECOfrT2 -111812012 <1.0 7.6 <1.0 <1.0 _________ }2,
2nd Qtr 6/6/2012 <1.0___ -------8-:-4 <1.0 ______ <1_0-----39
3rd Ctr 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
1st Ctr 2113/2013 <1.0 10.8 <1.0 <1.0 34.3
2nd Ctr 6/13/2013 <1.0 11.2 <1.0 <1.0 36.5
3rd Ctr 9/5/2013 <1.0 11.6 <1.0 <1.0 39.1
4th Ctr 11/13/2013 <1.0 14.4 <1.0 <1.0 41.1
1st Ctr 1/30/2014 <1.0 12.5 <1.0 <1.0 40.5
2nd Ctr 5/2212014 <1.0 13.4 <1.0 <1.0 51 .4
3rd Ctr 8/14/2014 <1.0 12.0 <1.0 <1.0 44
4th Ctr 10/13/2014 <1.0 14.6 <1.0 <1.0 45.1
1st Ctr 3/1212015 <1.0 13.8 <1.0 <·1·:·o 45.1
Duplicate TW4-70 <1.0 13.8 <1.0 <1.0 46.4
2nd atr 6/10/2015 <1.0 13.3 1.07 <1.0 47.3
3rd Qtr 9/10/2015 <1.0 12.9 <1.0 <1.0 52.2
4th Qtr 10/28/2015 <1.0 11.0 <1.0 <1.0 43.6
1st atr 3i1712016 <1.0 11.0 <1.0 <1.0 44.7
2nd Ctr 5/23/2016 <1.0 13.6 <1.0 <1.0 45.9
3rd Otr 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
O~jcate TW4-75 _____ <1.0 12.0 <1.0 <1.0 49.5
1st Ctr 3/15/2017 <1.0 ----'i°z-:-6 <1.□------<1.0 -44.7
2nd atr 6/15/2017 <1:0 14.6 <1.0 <1.0 47.3
3rd Ctr 8/8/2017 <1.0 14.6 <1.0 <1.0 48.6
4thatr 10/11/2017 <1.0 13.8 <1.0 <1.0 42.5
DWMRC =lit samol& <0.19 12 <0.3 <0.32 47
1st air-3/1212018 <1.0 15.2 <1.0 <1.0 51 .2
2nd atr 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
Duplicate TW4-70 <1.0 15.3 <1.0 <1.0 55.9
4thatr 11/28/2018 <1.0 15.6 <1.0 <1.0 49.8
Duolicate TW4-70 <1.0 16.2 <1.0 <1.0 48.5
1statr 3/16/2019 <1.0 14.1 <1.0 <1.0 47.6
2nd atr 6/13/2019 <1.0 15.8 <1.0 <1.0 49.3
3rd Qtr 9/11/2019 <1.0 14.6 <1.0 <1.0 46.1
Duplicate TW4-70 <1.0 13.6 <1.0 <1.0 45.8
4th Qtr 12114/2019 <1.0 15.7 <1.0 <1.0 53.1
Dunlicate TW4-70 <1.0 16.0 <1.0 <1.0 52.5
1stOtr 3/17/2020 <1.0 14-.8 <1.0 <1.0 48.3
Duplicate TW4-70 <1.0 14.8 <1.0 <1.0 48.4
2nd atr 6/11/2020 <1.0 15.4 <1.0 <1.0 49.5
3rd Otr 9/18/2020 <1.0 14.8 <1.0 <1.0 47.0
4th Qtr 11/4/2020 <1.0 15.6 <1.0 <1.0 50.2
1stOtr 3/18/2021 <1.0 12.9 <1.0 <1.0 46
2nd atr 6/16/2021 <1.0 13.0 <1.0 <1.0 50.8
3rd Ctr 9/2212021 <1.0 11.2 <1.0 <1.0 39.8
4th Qtr 1218/2021 <1.0 12.4 <1.0 <1.0 51.3
"f!£citr 3/23/2022 <1.0 11.0 <1.0 <1.0 47.7
2nd Ctr 6/16/2022 <1.0 10.3 <1.0 <1.0 40.7
3rd atr 9/14/2022 <1.0 13.2 <1.0 <1.0 45.8
4th Qtr 1218/2022 <1.0 7.6 <1.0 <1.0 51.8
1Siatr 3/29/2023 <1.0 8.6 <1.0 <1.0 51.3
2nd Ctr 6/21/2023 <1.0 8.1 <1.0 <1.0 52.5
(1) VO Cs were resamplad because laboratory missed holding time.
~~: ~o~:~~i;~~~~,$~ =:ad~~ ~~=s no ~r rec&M~ water
NA and #N/A(for i::iraphs) = not analyzed
Shaded indicates coocentrations exceedinSJ GWQS.
Nitrate, Nitrate + Nitrite
(10mg/L)
4.9
3.7
6.
6 .
6.
5.
6.
2.
7.
7
7.
8.
7.4
8.
7.
9.
7.
7.
8.
7.
6.
7.1
7.C
7.
7.0
7.2
7.5
6.0
#NIA
5.
-8
8
7
8.2
10.70
7.7
7.7
9.1
7.7
7.
8.
9.
8.
7.1
}
1(
8.
8.
8.:
8.
8.
8.
8.52
8.57
8.6
8.36
9.24
7.34
~;
7.!
7.
7.f
7.0
6.8
6.9
7.2
7.1
7.7
7.!
6.,
6.1 -7
8.
6.1
6.7
7.
7.1
7.2,
7.7
6.
7.1
TABLE 1 (9 of 33)
Historic Summary Of Monitoring Well Analytical Results Up To The 2nd Quarter 2023
Chlorofonn Contamination Investigation
DUSA White Mesa Mill
TW4-1; Parameter
Sampling Event IGWQSl
Carbon Tetrachloride Chlorofonn Chloromethane Methylene Chloride
15 ua/Ll 170 ua/L) 130 ua/L) 15 ua/L)
1sI Qtr 3/16/2005 NA <1.0 NA NA
2nd Qtr 5/25/2005 NA 2.5 NA NA
3rd Qtr 8/31/2005 <1.0 10 2.8 <1.0
4th Qtr 12/7/2005 <1.0 17 1.3 <1.0
1st0tr 3/9/2006 <1 .0 31 <1.0
2nd Otr 6/14/2006 <1.0 19 <1.0
3rd Qtr 7/20/2006 <1.0 11 <1.0
4th Qtr 11/8/2006 <1 .0 42.8 <1.0
1st Qtr 2/28/2007 <1 .0 46 <1.0
2nd Qtr 6/27/2007 <1.0 11 <1.0
3rd Qtr 8/15/2007 <1.0 18 <1.0
4th Ctr 10/10/2007 <1.0 18 <1.0
1st Ctr 3/28/2008 <1.0 52 <1.0
2nd Qtr 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
1st Otr 3/4/2009 <1.0 81 <1.0
2nd Ctr 6/23/2009 ~1:_0 --120 <1.0 ---3rd Ctr 9/14/2009 <1.0 280 <1.0
4th Qtr 12/29/2009 <1.0 250 <1.0
1stQtr(5) 2/25/2010 <1.0 -------,coo <,.o------
2nd Qtr 6/14/2010 <1.0 590 <1.0
3rd Ctr 8/11/2010 <1.0 630 <1.0
4th Ctr 10/15/2010 <1.0 420 <1.0
1st Otr 2/22/2011 <1.0 47 <1.0
2nd Qtr 5/26/2011 <1.0 9.6 <1.0
3rd Ctr 0m 2011 <1.0 16 <1.0
4th Ctr 11/16/2011 NA #N/A NA
(1) 12/7/2011 <1.0 21 <1.0
~2) 11/16/2011 <1.0 50 <1.0
---1"~ --1/18/2012 <1.0 38 <1.0 ----------------4-:7 <1.0 ______
2nd Qtr 6/6/2012 <1.0
3rd Qtr 9/11/2012 <1.0 6.9 <1.0
4th Qtr 10/4/2012 <1.0 9 <1.0
1stQtr 2/13/2013 <1.0 6.89 <1.0
2nd Otr 6/13/2013 <1.0 4.86 <1.0
3rd Qtr 9/5/2013 <1.0 5.93 <1.0
4th Qtr 11/13/2013 <1.0 5.51 <1.0
1st Qtr 1/29/2014 <1.0 5.7 <1.0
2nd Qtr 5/22/2014 <1.0 10.3 <1.0 -3rd Ctr 8/14/2014 <1.0 202 <1.0
(3) 9/24/2014 <1.0 260 <1.0
4th Qtr 10/29/2014 <1.0 723 <1.0
1st Otr 3/12/2015 <1.0 1.180 <1.0
2nd Qlr 6/10/2015 <1.0 1.040 <1.0
3rdQtr 9/10/2015 <1.0 1.040 <1.0
4th Qtr 10/29/2015 <1.0 843 <1.0
1stOtr 3/22120i6 <1.0 834 <1.0
2nd Otr 6/8/2016 <1.0 486 <1.0
3rd Ctr 7/27/2016 <1.0 433 <1.0
4th Qtr 10/26/2016 <1.0 301 <1.0
1statr 3/16/2017 <1.0 288 <1.0
2nd Qtr 6/21/2017 <1.0 239 <1.0
3rdQtr 8/8/2017 <1.0 129 <1.0
4th Qtr 1Q/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 ___ -------74-:9 <1.0 ______
3rdQtr 9/5/2018 <1.0 53.2 <1.0
4th Otr 12/12/2018 <1.0 37.0 <1.0
1stOtr 3/19/2019 <1.0 23.2 <1.0
2ndOtr 6/13/2019 <1.0 15.8 <1.0
3rd Ctr 9/11/2019 <1.0 15.8 <1.0
4th Qtr 12/14/2019 <1.0 7.4 <1.0
1st Otr 3/17/2020 <1.0 6.93 <1.0
2nd Qtr 6/11/2020 <1.0 4.9 <1.0
3rdQtr 9/18/2020 <1.0 3.6 <1.0
4th Ctr 11/4/2020 <1.0 4.61 <1.0
1stOtr 3/18/2021 <1.0 3.78 <1.0
2nd Qtr 6/16/2021 <1.0 2.9 <1.0
3rd Otr 9/15/2021 <1.0 3.71 <1.0
4thQtr 12/8/2021 <1.0 3.92 <1 .0
1st Qtr 3/22/2022 <1.0 3.10 <1 .0
2nd Qtr 6/16/2022 <1.0 2.1 <1 .0
3rd Qtr 9/14/2022 <1.0 3.90 <1.0
4th Qtr 12/8/2022 <1.0 1.50 <1.0
1st Qtr 3/29/2023 <1.0 1.70 <1 .0
2nd Qtr 6/20/2023 <1.0 2.3 <1.0
(1) VOCs were resampled because laboratory missed holding time.
(2) Results of the TW4---70 the duplicate sample for TW4-6
(3) Reanalyzed fot voes only.
(4) As of March 2012 both north and south WIid hfe f?Ms ~ ll)l"l~H~ water
JS) Chloroform _pum9 well TW4-4 stared IO 1s~~ 2010 --•
(6) Chlorofotm_pu;ne,"£ well TW4-41 installed M!}' 2018 --•
NA and #N/A(for graphs) = not analyzed
Shaded indicates 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
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
<--i~0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1 .0
<1 .0
<1 .0
<1.0
<1.0 <1.0------
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<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 (mn/L)
NA
NA
NA
32
31
30
37
65 32
38
36
35
33
35
35
33
35
37
37
41
---45
33
31
41
40
42
39
36
NA
33
38
-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:f
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
43.1
38.7
40.7
43.2
44.7
Nitrate, Nitrate + Nitrite
110 mn/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
0.21
0.144
0.134
<0.1
0.13
TW4-7
Sampling Event
TABLE 1 110 of 33)
Historic Summary Of Monitoring Well Analytical Results Up To The 2nd Quarter 2023
Chlorofonn Contamination Investigation
OUSA White Mesa Mill
Parameter
IGWQSI
Carbon Tetrachloride Chlorofonn Chloromethane Methylene Chloride Chloride
15 ua/L) 170 ua/LI 130 ua/LI 15 u9'L) No GWQS Ima/LI
1st0tr 3/16/2005 NA 3,100
2nd Otr 5/25/2005 NA 2.700
3rdQtr 8/31/2005 <10 3,100
4th Qtr 12/7/2005 <50 2,500 ---1st0tr 3/9/2006 <50 1,900
2nd Qtr 6/14/2006 <SO 2,200
3rdQtr 7/20/2006 <SO 2,140
4th Qtr 11/8/2006 1.5 2,160
1st0tr 2128/2007 1.1 i.830
2nd Qtr 6/27/2007 1.5 2,600
3rdQtr 8/15/2007 1.4 2,300
4th Qtr 10/10/2007 1.2 1,900
1st0tr 3/28/2008 1.3 2,200
2nd Qtr 6/25/2008 1.3 1,800
3rdQtr 9/10/2008 1.4 1,600
4th Qtr 10/15/2008 NA #NIA
11/18/2008 <2.0 2,500
1stQtr 3/11/2009 1.2 1.800
2nd Qtr 6/23/2009 <1.0 1.400
3rdQtr 9/14/2009 1 1,500
4th Ctr 12129/2009 <1.0 1.300
1st Ctr 2125/2010 <1.0 1,200
2nd Qtr 6/14/2010 <1.0 1,100
3rd Qtr 8/11/2010 1 1,500
4th Qtr 10/15/2010 <1.0 1,100
1stQtr 2123/2011 <1.0 1.300
2nd Qtr 6/1/2011 <1.0 1,200
3rd Qtr 8/18/2011 <1.0 1,200
4th Qtr 11/29/2011 <1.0 1,000
istaiT(l) 111912012 <1.0 1,000
2nd Qtr 6/14/2012 <1.0 ----790
3rd Qtr 9/13/2012 <1.0 870
4th0tr 10/4/2012 <1.0 940
1st Otr 2113/2013 <1.0 940
2nd Qtr 8/18/2013 <1.0 953
3rd Qtr 9/1212013 <1.0 1,040
4th0tr 11/14/2013 <1.0 1,050
1st0tr 215/2014 5.41 946
2nd Otr 5/22/2014 4.78 847
3rd Qtr 8/27/2014 <1.0 857
4th Qtr 10/30/2014 <1.0 926
1stQtr(2) 3/18/2015 <1.0 ------942
2nd Qtr 6/11/2015 <1.0 950
Qtr 9/10/2015 <1.0 897
Qtr 10/29/2015 <1.0 847
atr "ji2212016 <1.0 834
Qtr 618/2016 <1.0 909
Qtr 8/4/2016 <1.0 1,000
10/26/2016 <1.0 886
3/21/2017 <1.0 986
6/21/2017 <1.0 968
Qtr 8/4/2017 <1.0 1,070
th Qtr 10/11/2017 <1.0 884
OWMRC splits.amola <7.6 890
1statr 3/21/2018 <1.0 721-
2nd Qtr 6/14/2018 <1.0 751
3rd0tr 9/6/2018 <1.0 781
4th Qtr 12113/2018 <1.0 838
1stQtr 3/20/2019 <1.0 736
2nd Qtr 6/19/2019 <1.0 862
3rd Qtr 9/1212019 <1.0 801
4th Qtr 12118/2019 <1.0 546
1stQtr 3/18/2020 <1.0 746
2nd Otr 6/1212020 <1.0 864
DeplieateTW4-75 <1.0 871
3rdQtr 9/19/2020 <1.0 971
4th Otr 11/11/2020 <1.0 967
D~~!Ls.!.T.P.:I.~ <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 1219/2021 <1.0 -868
1St atr 3/24/2022 <1.0 776
2nd Qtr 6/2212022 <1.0 447
3rdQtr 9/15/2022 <1.0 887
4th Qtr 1219/2022 <1.0 824
1st Otr 3/29/2023 <1.0 619
2nd Qtr 6/21/2023 <1.0 706
(1) As of March 2012 both north and south wild ld"e ponds no IOf'l98'5eceMl'lSl water
J~chlofoform_P'Jfflptng_wetts TW4-1andTW4-2staned1r11/14115 _____ _
NA and IN/A(for i:iraphs) = not analyzed
Shaded indicates concentrations exceedinl:I GWCS.
Bokl and italics indicates the MOL excaeded the GWCS
J = APJ)roXJmated value
NA NA NA
NA NA NA
<10 <10 NA
<50 <50 52
<SO <SO 48
<SO <50 47
<50 <SO 51
<1.0 _<1_._o 49
<1.0 <1.0 47
<1.0 <1.0 45
<1.0 <1.0 44
<1.0 <1.0 45 "<io <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 <T O ______ <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 <-i~o <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.:i'
<1.0 <1.0 41.7
<1.0 <1.0 42.8
<1.0 <1.0 42.9
2.1 <1:0 41 .3
<1.0 <1.0 42.5
<1.0 <1.0 45
<1.0 <1 .0 44.8
2.1 <1 .0 44.9
<1.0 <1.0 45.7
Nitrate, Nitrate+ Nitrite
l10mo/L)
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
#NIA
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
4.06
4.19
3.87
4.40
3.90
4.25
4.80
4.58
3.02
4.10
3.90
3.77
4.06
3.85
3.89
TW4-8
Sampling Event
TABLE 1 (11 of 33)
Historic Summary Of Monitoring Well Analytical Results Up To The 2nd Quarter 2023
Chlorofonn Contamination Investigation
DUSA White Mesa Mill
Parameter
<GWQSI
Carbon Tetrachloride Chlorofonn Chloromethane Methylene Chloride Chloride Nitrate, Nitrate + Nitrite
15 uolll <70 ug/LI (30 unfLI (5 ug/L) No GWQS lma/L) (10mg/L)
1st Qtr 3/1612005 NA 10 NA NA
2nd Qtr 512512005 NA <1.0 NA NA
3td Qtr 8131/2005 <1.0 1.1 1.7 NA
4th0tr 12/712005 <1.0 <1.0 <1.0 <1.0
1st Ctr 3/9/2006 <1.0 1.3 2.1 <1.0
2nd Qtr 6/14/2006 <1.0 1.8 1.0 <1.0
3rd Otr 7/20/2006 <1.0 <1.0 <1.0 <1.0
4thQtr 11/8/2006 <1.0 <1.0 <1.0 <1.0
1st Qtr ·:;-ro 2/28/2007 2.5 <1.0 <1.0
2nd Qtr 6/27/2007 <1.0 2.5 <1.0 <1.0
3td Qtr 8/15/2007 <1.0 1.5 <1.0 <1.0
4th0tr 10/10/2007 <1.0 3.5 <1.0 <1.0
1st Qtr 3/28/2008 <1.0 <1.0 <1.0 <1.0
2nd Qtr 6/25/2008 <1.0 <1.0 <1.0 <1.0
3td Qtr 9/10/2008 <1.0 <1.0 <1.0 <1.0
4th0tr 10/15/2008 <1.0 <1.0 <1.0 <1.0
1st Otr 3/4/2009 <1.0 <1.0 <1.0 <1.0
2nd Qtr 6/23/2009 <1.0 <1.0 <1.0 <1.0
3td Qtr 9/14/2009 <1.0 <1.0 <1.0 <1.0
4thQtr 12/1712009 <1.0 <1.0 <1.0 <1.0
1st Qtr 2/24/2010 <1.0 <1.0 <1.0 <1.0
2nd Qtr 611412010 <1.0 <1.0 <1.0 <1.0
3rd Qtr 8/18/2010 <1.0 <1.0 <1.0 <1.0
4thQtr 10/15/2010 <1.0 <1.0 <1.0 <1.0
1stQtr 2/16/2011 <1.0 <1.0 <1.0 <1.0
2nd Qtr 5/25/2011 <1.0 <1.0 <1.0 <1.0
3rd Qtr 8/16/2011 <1.0 <1.0 <1.0 <1.0
4th Qtr 11/16/2011
(1/ 12/7/2011 <1.0 <1.0 <1.0 <1.0
lsfCifi (3 1/18/2012 ·:;tr o <1·:o <1.0 <1.0
2nd Qtr 5/13/2012 <1.0
<1.0 ____ <1.0 ______
<1.0
3td Qtr 8/29/2012 <1.0 <1.0 <1.0
4th Qtr 10/3/2012 <1.0 <1.0 <1.0
1statr 2/7/2013 <1.0 <1.0 <1.0
2nd Qtr 5/30/2013 <1.0 <1.0 <1.0
3tdQtr 9/5/2013 <1.0 <1.0 <1.0
4th Qtr 1117/2013 <1.0 <1.0 <1.0
1stOtr 1/23/2014 <1·.o 63.8 <1.0
12) 2/6/2014 <1.0 100 <1.0
2nd Qtr 5/22/2014 <1.0 122 <1.0
3tdQtr 8/27/2014 <1.0 107 <1.0
4th Qtr 10/29/2014 <1.0 191 <1.0
1st0tr(4) 3/12/2015 <1.0 ____ ------¥, <1.0 ______
2ndQtr 6/11/2015 <1.0 981 <1.0
3td0tr 9/10/2015 <1.0 747 <1.0
4th Qtr 10/29/2015 <1.0 770 <1.0
1stQtr 3/17/2016 <1-~o 634 <1.0
2nd Qtr 6/8/2016 <1.0 595 <1.0
3tdQtr 8/4/2016 <1.0 522 <1.0
4th Qtr 10/27/2016 <1.0 --472 <1.0
1stOtr 3i21/2017 <1.0 359 <1.0
2nd Qtr 6/21/2017 <1.0 256 <1.0
3tdQtr 814/2017 <1.0 223 <1.0
~ 10/11/2017 <1.0 214 <1.0
Deplicate TW4-75 <1.0 194
DWMRC spjrt sample <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
3td0tr 9/5/2018 <1.0 137 <1.0
4th Otr 12/13/2018 <1.0 93.8 <1.0
1statr 3/19/2019 <1.0 103 <1.0
2nd Otr 6/1912019 <1.0 96 <1.0
3td0tr 9/12/2019 <1.0 75.4
DeplicateTW4-75 <1.0 75.6
4th0tr 12/18/2019 <1.0 84.4
1st Qtr 3118/2020 <1.0 55.0
2nd Qtr 6/12/2020 <1.0 53.8
3td Qtr 9/18/2020 <1.0 39.5
4th Qtr 11/11/2020 <1.0 51.3
Oeplicate TW4-70 <1.0 52.9
OWMRC wit samale <10 50.0
1st atr 3/18/2021 <1.0 26.9
2nd Otr 6/16/2021 <1.0 22.3
3tdQtr 9/22/2021 <1.0 17.0
DeplicateTW4-70 <1.0 16.4
4th Otr 12/8/2021 <1.0 17.2
1stOtr 3/23/2022 <1.0 15.1
2nd Qtr 6/16/2022 <1.0 10.9
3td0tr 9/14/2022 <1.0 15.3
4th Qtr 12/8/2022 <1.0 4.4
1stQtr 3/29/2023 <1.0 9.1
2ndOtr 6/21/2023 <1.0 10.9
(1) voes were resampled because laborato.-y missed holding time.
(2) Resampled to verify chloroform concentration that was collected on 1123/14.
(3) As of March 2012 both north and south wdd ~le ponds no l()fl9•HttC8M"2 water
(4) chloroform~ W'9l!s TW4-1 and TW4-2 started in 1/14115 ______ •
NA and #N/A(for graphs) = not analyzed
Shaded indicates concentrations exceeding GWQS.
J ::: Approx1matecf 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
<1.0
<1.0
<1.0
<1.0
<1.0
H = Sample was analyzed beyond holding times and may not be accureate concentration.
1.12
4.7 J
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<3.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<20
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1 .0
<1.0
<1.0
<1.0
<1.0
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
)<A #NIA
45 0.3
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 0.914
49.6 2.3
53 1.88
59.6 1.96
52 2.2
54.2 2.48
58.7 2.14
56.9 2.10
60.1 2.16
57.4 2.06
58.8 1.97
61.2 1.64
52.2 1.92
56.2 1.71
61 1.90
60.8 1.36
60.8 1.36
53.8 1.31
63.2 1.40
53.1 1.35
54.3 1.23
56.5 1.1
52 0.999
52.5 1.030
60.1 1.21
53.8 1.04
56.9 1.06
52.6 0.894
54.7 1.27
49.9 1.27
56 0.16 H
52.8 1.00
51:5 1.12
40.8 0.665
43.1 0.59
54.9 0.738
50.8 0.80
52.8 0.64
52.5 0.718
50.8 0.654
53.4 0.658
55.3 0.597
TABLE 1 (12 of 33)
Historic Summary Of Monitoring Well Analytical Results Up To The 2nd Quarter 2023
Chlorofonn Contamination Investigation
OUSA White Mesa Mill
TW4-9 Parameter
Sampling Event IGWQSI
Carbon Tetrachloride Chlorofonn Chloromethane Methylene Chloride Chloride Nitrate, Nitrate + Nitrite
(5 uo/L) 170 ua/LI 130 ua/L) 15~g/L) No GWQS Im•• (10 mg/LI
1st Qtr 3/16/2005 NA 3.8 NA NA NA 1.3
2nd Qtr 5/25/2005 NA 1.2 NA NA NA 1.3
3rdQtr 8/31/2005 <1.0 <1.0 2.9 <1.0 NA 1.3
4thQlr 1217/2005 <1.0 <1.0 <1.0 <1.0 42 ,~
1st Ctr 3/9/2006 <1.0 <1.0 2.6 <1.0 36 ,~
2nd Otr 6/14/2006 <1.0 19 2.7 <1.0 ~ ,~
3rd Qtr 7/20/2006 <1.0 <1.0 <1.0 <1.0 41 0.9
4th Olr 11/8/2006 <1.0 <1.0 <1.0 <1.0 44 0.7
1st Ctr 2/28/2007 <1.0 <1.0 <1.0 <1.0 44 0.6
2nd Otr 6/27/2007 <1.0 21 <1.0 <1.0 Q ,~
3rdQlr 8/15/2007 <1.0 9.5 <1.0 <1.0 36 1.6
4th Olr 10/10/2007 <1.0 8.7 <1.0 <1.0
1st Otr 3/28/2008 <1.0 1.3 <1-:0 <1.0
40 2 u ~,
2nd Qtr 6/25/2008 <1.0 1 <1.0 <1.0 35 2.3
3rd Qtr 9/10/2006 <1.0 <1.0 <1.0 <1.0 26 2.79
4th Qtr 10/15/2006 <1.0 <1.0 <1.0 <1.0 56 1.99
1stQtr 3/4/2009 <1.0 <1.0 <1.0 <1.0 30 2.5
2nd Ctr 6/23/2009 <1.0 <1.0 <1.0 <1.0 30 2.3
3rd a,, 9/14/2009 <1.0 <1.0 <1.0 <1.0 30 2.5
th Qlr 12/17/2009 <1.0 <1.0 <1.0 <1.0 37 1.7
statr 2/23/2010 <1.0 <1.0 <1.0 <1.0 47 1.4
2nd Qtr 6/14/2010 <1.0 <1.0 <1.0 <1.0 a 1~
3rd Qtr 6/13/2010 <1.0 <1.0 <1.0 <1.0 40 1.2
1th atr 10/15/2010 <1.0 <1.0 <1.0 <1.0 34 1.6
st Ctr 2/17/2011 <1.0 <1.0 <1.0 <1.0 ~ ,~
2ndQtr 5/25/2011 <1.0 <1.0 <1.0 <1.0 36 3.4
3rd Qlr 8/16/2011 <1.0 <1.0 <1.0 <1.0 21 4
4th Olr 11/16/2011 NA NA NA NA 38 2.3
fsfCffrw 1217/2011 <1.0 <1.0 <1.0 <1.0
1/16/2012 <1.0 <:1.0 <T·o <1.0 -------indQtr 5/31/2012 <1.0 <1.0 ____ <1.0 ______ <1.0
NA #NIA
26 2.3
23 4.0
3rdQlr 6/30/2012 <1.0 <1.0 <1.0 <1.0 22 3.9
th Ctr 10/3/2012 <1.0 <1.0 <1.0 <1.0
st Ctr 217/2013 <1.0 <1.0 <1.0 <1.0 lfc"~~---":c'='c~ct-'-~------+~c----➔.c.;~----t-'7'c-------t-----~2""i'"! /.;:
Qtr 5/30/2013 <1.0 <1.0 <1.0 <1.0 21.4 4.49
Qtr 9/5/2013 <1.0 <1.0 <1.0 <1.0 22.7 4.03
Qtr 11nt2013 <1.0 <1.0 <1.0 <1.0 23.6 4.87
Qlr 1/29/2014 <1.0 <1.0 <1.0 <1.0 22 4.36
Qtr 5/22/2014 <1.0 6.9 <1.0 <1.0 24 3.44
Qtr 8/14/2014 <1.0 47 <1.0 <1.0 27 2.7
4th Qtr 10/29/2014 <1.0 101 <1.0 <1.0 25 4.29
1st Qtr 3/12/2015 <1.0 53.5 <1.0 <1.0 29.5 3.28
2nd Qtr 6/11/2015 <1.0 35.1 <1.0 <1.0 35.3 1.83
3rdQlr 9/3/2015 <1.0 48 <1.0 <1.0 39.3 1.44
thOtr 10/26/2015 <1.0 68.4 <1.0 <1.0 29.2 2.89
statr 3/17/2016 <1.0 74.3 <1.0 <1.0 33.6 2.51
2nd Qtr 6/6/2016 <1.0 76.2 <1.0 <1.0
3rdQlr 8/3/2016 <1.0 76.8 <1.0 <1.0 P.~-----l"+'~------l------c3~5 .. 1 2.16 33.6 2.11
thOtr 10/26/2016 <1.0 76.0 <1.0 <1.0 37.4 2.24
statr 3/17/2017 <1.0 113 <1.0 <1.0 34.5 2.16
2nd Qtr 6/21/2017 <1.0 113 <1.0 <1.0 35.9 1.92
3rd Qtr 8/3/2017 <1.0 118 <1.0 <1.0 37 1.90
4th atr 10/11/2017 <1.0 132 <1.0 <1.0 32 2.16 ir~ <0.98 120 <1.5 1.6 J
3/21/2016 <1.0 159 <1.0 <1.0
6/4/2016 <1.0 134 <1.0 <1.0
TW4-75 <1.0 132 <1.0 <1.0
9/5/2018 <1.0 94.2 <1.0 <1.0
TW4-75 <1.0 92.4 <1.0 <1.0
12/13/2016 <1.0 109 <1.0 <1.0
35 2.20
36.3 1.65
35.7 1.65
35.2 1.91
43.4 1.04
42.7 1.11
36.3 1.23
~ 3/19/2019 <1.0 66.4 <1.0 <1.0
6/19/2019 <1.0 66.1 <1.0 <1.0
9/11/2019 <1.0 66.0 <1.0 <1.0
12/16/2019 <1.0 54.6 <1.0 <1.0
3/18/2020 <1.0 46.9 <1.0 <1.0
6/12/2020 <1.0 55.1 <1.0 <1.0
Deplicate TW4-70 <1.0 56.4 <1.0 <1.0
3rd atr 9/16/2020 <1.0 45.0 <1.0 <1.0
36.9 1.09
36.3 0.765
35.2 0.904
40.1 0.744
37.7 0.655
39.5 0.990
39.6 1.010
36.7 0.667
4th Qtr 11/11/2020 <1.0 47.1 <1.0 <1.0 37.2 1.11
DWMRC split sample <10 46.0 <20 <20 36 0.97
DWMRC Cup sample (TW4-81) <10 46.0 <20 <20
1stOtr 3/16/2021 <1.0 39.0 <1.0 <1.0 ~==~-'7'=------+---~cc+-7'c----+-7CC-----+------,a3°'6 0.97 40.i 1.06
Oeplicate TW4-70 <1.0 36.2
2nd Qlr 6/16/2021 <1.0 102
3rdOtr 9/22/2021 <1.0 30.0
4th Qtr 12/6/2021 <1.0 25.4
1stOtr 3/23/2022 <1.0 16.5
2nd Qtr 6/22/2022 <1.0 9.8
3rd Qtr 9/14/2022 <1.0 10.8
DeplicateTW4-70 <1.0 6.7
4th Otr 12/6/2022 <1.0 6.7
n.....a:,.~te TW4-70 <1.0 6.0
1statr 3/29/2022 <1.0 6.2
Deplicate TW4-70 <1.0 5.6
2nd Qtr 6/21/2023 <1.0 5.0
Oeolicate TW4-70 <1.0 4.8
(1) voes were resampled because laboratory missed holding time. (2) As of March 2012 both north and south wild IJfe ponds no longel'feee!WIQ. water
NA and #N/A{for Rraphs) = not analyzed
Shaded indicates concentrations e><ceedinR GWOS.
J = Approximate value
<1.0 <1.0 36.7 1.07
<1.0 <1.0 37.4 2.0
<1.0 <1.0 30.6 0.700
<1.0 <1.0 36.9 0.796
<1.0 <1.0 34.6 0.80
<1.0 <1.0 41 .7 0.62
<1.0 <1.0 32.4 0.673
<1.0 <1.0 32.4 0.660
<1.0 <1.0 33.2 0.676
<1.0 <1.0 56.5 0.660
<1.0 <1.0 37.1 0.765
<1.0 <1.0 36.4 0.743
<1.0 <1.0 38.0 0.742
<1.0 <1.0 38.0 0.733
TABLE 1 (13 of 33)
Historic Summary Of Monitoring Well Analytical Results Up To The 2nd Quarter 2023
Chloroform Contamination Investigation
OUSA White Mesa Mill
TW4-10 Parameter
Sampling Event IGWQSl
Carbon Tetrachloride Chloroform Chloromethane Methylene Chloride
(5 ua/L) 170 ua/Ll 130 µa/LI 15 ua/Ll
1stQtr 3/16/2005 NA 140 NA NA
2ndQtr 5/25/2005 NA 62 NA NA
3rdQtr 8/31/2005 <2.5 110 6.2 <2.5
4th Otr 12/7/2005 <2.5 300 <2.5 <2.5
1statr 3/9/2006 <5.0 190 <5.0 <5.0
2ndQtr 6/14/2006 <5.0 300 <5.0 <5.0
3rdOtr 7/2012006 <5.0 504 <5.0 <5.0
4th Otr 11/8/2006 <1 .0 452 1.6 <1.0
1statr 2/2812007 <1 .0 500 <1.0 <1.0
2nd0tr 6/27/2007 <1.0 350 <1.0 <1.0
3rd Qtr 8/1512007 <1 .0 660 <1.0 <1.0
4th Otr 10/10/2007 <1 .0 470 <1.0 <1.0
1stQtr 3/28/2008 <1.0 620 <1.0 <1.0
2ndQtr 6/25/2008 <1 .0 720 <1.0 <1.0
3rdQtr 9/10/2008 <1.0 660 <1.0 <1.0
4th Qtr 10/15/2008 NA #NIA NA NA
11/18/2008 <2.0 1.200 <2.0 <2.0
1st Qtr 3/11/2009 <1.0 1,100 <1.0 <1~0
2ndQtr 6/23/2009 <1.0 1,200 <1.0 <1.0
3rdQtr 9/14/2009 <1.0 910 <1.0 <1.0
4th Qtr 12/22/2009 <1.0 300 <1.0 <1.0
1stQtr 3/3/2010 <1.0 460 <1.0 <1.0
2nd0tr 6/14/2010 <1.0 220 <1.0 <1.0
3rdOtr 8/12/2010 <1 .0 100 <1.0 <1.0
4th Otr 10/15/2010 <1 .0 1,100 <1.0 <1.0
1statr 2/23/2011 <1.0 620 <1.0 <1.0
2ndQtr 6/14/2011 <1.0 280 <1.0 <1.0
3rdQtr 8/17/2011 <1 .0 180 <1.0 <1 .0
4th Qtr 11/16/2011 <1.0 110 <1.0 <1.0
·1ffCiffTi1 111912012 <1.0 76 <1.0 <1 .0
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
1st0tr 2/13/2013 <1 .0 154 <1.0 <1.0
2ndQtr 6/13/2013 <1.0 486 <1.0 <1 .0
3rdQtr 9/12/2013 <1.0 1,126 <1.0 <1 .0
4thQtr 11/14/2013 <1.0 1,380 <1.0 <1 .0
1st0tr 1/29/2014 5.16 1,260 <1.0 <1.0
2nd Qtr 5/2312014 <1.0 1,110 <1.0 <1.0
3rd Qtr 8/27/2014 <1.0 1,060 1.5 <1 .0
4th Qtr 10/30/2014 <1.0 1,220 <1.0 <1 .0
1st0tr 3/18/2015 <1.0 1,210 <1.0 <1.0
2ndQtr 6/11/2015 <1.0 1,240 <1.0 <1.0
3rdQtr 9/10/2015 <1.0 1,280 <1.0 <1.0
4th Qtr 10/29/2015 <1.0 1,350 <1.0 <1.0
1stQtr 3/22/2016 <1.0 1,430 <1.0 <1.0
2nd Qtr 6/8/2016 <1.0 1,510 <1.0 <1 .0
3rdQtr 8/4/2016 <1.0 1,500 <1.0 <1 .0
4th Qlr 10/26/2016 <1.0 1,290 <1.0 <1.0
1statr 3/21/2017 <1.0 1,260 <1.0 <1.0
2nd Qtr 6/21/2017 <1.0 1,140 <1.0 <1 .0
3rdOtr 8/412017 <1.0 1,320 <1.0 <1.0
4th Otr 10/11/2017 <1 .0 1,150 <1.0 <1.0
OWMRCBDlrtumDMI <9.5 1,100 <15 16 J
1statr 3/21/2018 <1.0 1,240 <1.0 <1 .0
2ndOtr 6/14/2018 <1.0 914 <1.0 <1.0
3rd Otr 9/6/2018 <1.0 911 <1.0 <1.0
th Qtr 12/13/2018 <1.0 1,070 <1.0 <1.0
stQtr 3/20/2019 <1 .0 869 <1.0 <1 .0
2nd Qtr 6/19/2019 <1.0 799 <1.0 <1.0
3rd Qtr 9/12/2019 <1.0 734 <1.0 <1 .0
4thOtr 12/18/2019 <1.0 768 <1.0 <1.0
1st Qtr 3/18/2020 <1 .0 798 <1.0 <1 .0
2nd Otr 6/11/2020 <1 .0 928 <1.0 <1.0
3rd Otr 9/19/2020 <1 .0 854 <1.0 <1.0
4thOtr 11/11/2020 <1 .0 903 <1.0 <1.0
1st Otr 3/18/2021 <1 .0 718 <1.0 <1.0
2nd Qtr 6/17/2021 <1 .0 609 <1.0 <1 .0
3rd Qtr 9/23/2021 <1.0 545 <1.0 <1 .0
thQtr 12/9/2021 <1.0 675 <1.0 <1.0
1st Qtr 3/24/2022 ·<1:0 471 1 <1 .0
~icateTW4•75 <1.0 456 1 <1 .0
Otr 6/22/2022 <1.0 342 <1.0 <1.0
Otr 9/15/2022 <1 .0 563 <1.0 <1.0
Otr 12/9/2022 <1 .0 499 <1.0 <1.0
Otr 3/29/2023 <1 .0 361 <1.0 <1 .0
"'" 6/21/2023 <1 .0 322 <1.0 <1 .0
(1) As of March 2012 both north and south wild life ponds no IOO~ff~ water
NA and #N/A(for graphs)= not analyzed
Shaded indicates concentrations exceeding GWQS.
J = Approximate value
Chloride
No GWQS lmalL)
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.ii
44.8
46.0
52.0
43.4
48.6
46.9
Nitrate, Nitrate + Nitrite
I10mg/L)
1.,
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
#NIA
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
13.5
17,3
14.9
14.9
14.8
1io
13.0
13.4
12.9
13.0
11.1
11 .2
10.1
10.6
9.34
8.86
7.79
6.89
7.83
8.13
7.34
8.69
7.20
7.75
6.35
5.47
5.1
4.9
4.6
5.57
4.76
4.2
3.8
TABLE 1 (14 of 33)
Historic Summary Of Monitoring Well Analytical Results Up To The 2nd Quarter 2023
Chloroform Contamination Investigation
DUSA White Mesa Mill
TW4-11(chlofoform~we!I
Slarted1114115) Parameter
Sampling Event IGWQSI
Carbon Tetrachloride Chloroform Chloromethane Methylene Chloride
15 uo/L) 170 uo/LI (30 ug/L) (5 µg/L)
1st Ctr 3/1612005 NA 4,400 NA NA
2nd Qtr 5/2512005 NA 3,590 NA NA
3rd Qtr 8/3112005 <10 4,400 <10 <10
4th Qtr 121712005 <100 4,400 <100 <100
1st Qtr 3/912006 <50 4,400 <50 <50
2nd Qtr 6/1412006 <50 4,300 <50 <50
3rdQtr 7120/2006 <50 4,080 <50 <50
4th Qtr 1118/2006 1.7 3,660 2} 1.3
1st Qtr 2/2812007 1.3 3.600 <1.0 1.6
2nd atr 6127/2007 1.6 3,800 <1.0 <1.0
3rd Qtr 8/1512007 1.7 4,500 <1.0 <1.0
4th Qtr 10/10/2007 1.6 4,400 <1.0 1.2
1stQtr 3/2812008 <1.0 340 <1.0 <1.0
2nd Qtr 6/25/2008 <1.0 640 <1.0 <1.0
3rd Qtr 9/10/2008 <1.0 900 <1.0 <1.0
4thQtr 10/15/2008 NA #N/A NA NA
11118/2008 <2.0 1,000 <2.0 <2.0
1st 0tr 3/1112009 ·:::1~0 1,000 <1.o <1.0
2nd Otr 6/2312009 <1.0 980 <1.0 <1.0
3rd Qtr 9/1412009 <1.0 1,000 <1.0 <1.0
4th Qtr 12/22/2009 <1.0 860 <1.0 <1.0
1stQtr 3/312010 <1.0 820 <1.0 <1.0
2nd Qtr 6/14/2010 <1.0 820 <1.0 <1.0
3rd Qtr 8/12/2010 <1.0 800 <1.0 <1.0
4thQtr 10/15/2010 <1.0 720 <1.0 <1.0
1stQtr 2/23/2011 <1.0 1,000 <1.0 <1.0
2nd Qtr 611/2011 <1.0 930 <1.0 <1.0
3rd Otr 811712011 <1.0 820 <1.0 <1.0
4thQtr 11116/2011 <1.0 1500 <1.0 <1.0
lsfOfflll 1124/2012 <1.0 610 <1.0 <1.0
2nd Qtr 6/1312012 <1.0___ ------660 <1.0 ______
<1.0
3rd0tr 9/1312012 <1.0 740 <1.0 <1.0
4thQtr 101312012 <1.0 730 <1.0 <1.0
1st Qtr 2/13/2013 3.23 867 <1.0 <1.0
2nd Qtr 6118/2013 <1.0 788 <1.0 <1.0
3rd0tr 9112/2013 <1.0 865 <1.0 <1.0
4th Otr 1111312013 <1.0 874 <1.0 <1.0
1stQtr 21512014. 5.19 785 <1.0 <1.0
2nd Qtr 5/23/2014 <1.0 751 <1.0 <1.0
3rd0tr 8127/2014 <1.0 719 1.2 <1.0
4th Qtr 10/29/2014 <1.0 803 <1.0 <1.0
1st Qt~2) 3191201 5 1.24 ----2~50 <1.0 ______
<1.0
2nd Qtr 6/1112015 <1.0 2,710 <1.0 <1.0
3rd Qtr 813112015 <1.0 1,120 <1.0 <1.0
4th Otr 10/29/2015 <1.0 2,730 <1.0 <1.0
1stOtr 319/2016 1.2 2,660 <1.0 <1.0
2nd Qtr 5/2312016 2.19 3,340 <1.0 <1.0
3rdQtr 7/25/2016 <1.0 3,200 <1.0 <1.0
4thQtr 10/12/2016 <1.0 3,200 <1.0 <1.0
1st Qtr 31812017 1.71 3,310 <1.0 <1.0
2nd Qtr 6/1312017 1.83 3,370 <1.0 <1.0
3rd Qtr 7/26/2017 1.81 3,290 <1.0 <1.0
~-10/11/2017 1.48 2,880 <1.0 <1.0
OWMRC solitsamole <38 2,900 <60 140 J
1stQtr 3112/2018 1.82 3,090 <1.0 <1.0
2nd Otr 618/2018 1.34 2,800 <1.0 <1.0
3rd Otr 8122/2018 1.47 3,050 <1.0 <1.0
4th Otr 1112812018 1.33 2,930 <1.0 <1.0
1stOtr 3/812019 1.48 2,820 <1.0 <i O
2nd Qtr 6/512019 1.52 2,970 1.4 <1.0
3rd Qtr 9/4/2019 1.47 2,790 <1.0 <1.0
4th Qtr 12/18/2019 <1.0 3,250 <1.0 <1.0
1stQtr 2/19/2020 <1.0 2,990 <1.0 <1.0
2nd Qtr 5/11/2020 1.37 2,810 <1.0 <1.0
3rd Qtr 9/412020 1.47 3,070 <1.0 <1.0
4th Qtr 1012812020 <1.0 2,670 3.86 <1.0
1stQtr 2/23120ii <1.0 2,750 <1.0 <1.0
2nd Otr 6/912021 <1.0 3,320 <1.0 <1.0
3rd Otr 8/2412021 <1.0 2,600 <1.0 <1.0
4th Qtr 12/112021 <1.0 2,850 <1.0 <1.0
1statr 3/9/2022 <1.0 2,780 <1.0 <1.0
2nd Qtr 6/8/2022 1.0 2,550 2.7 <1.0
3rd Otr 9115/2022 <1.0 3,020 <1.0 <1.0
4th Qtr 1113012022 <1.0 2,900 <1.0 <1.0
1statr 317/2023 <1.0 2.430 <1.0 <1.0
2nd Otr 6/13/2023 1.0 2 510 2.9 <1.0
(1)As of March 2012 both north and south wild Irle ~s no '°"i9r rec&Mng water
j2)Chloroform_pu}"f!"!i~iJs;~1/14115 _______ _
NA = not analvzed
Bold and italics indicates the MOL exceeded the GWQS.
Bold and italics indicates the MOL exceeded the GWCS
J = Approximated value
Chloride
No GWQS (mg/L)
NA
NA
NA
58
56
56
55
55
54
53
53
53
63
46
42
47
NA
49
44
49
46
42
40
43
49
46
49
48
46
43 ---------5 2'
49
50
47.3
49.3
46.6
46.7
48.5
51.6
48
--------56_4, 49.8
62.2
73.1
55.3
55.5
56.4
55.3
57.2
49.8
51.4
51
49.7
52
54
52.4
53.3
45.4
46.8
45.3
48.8
49.0
51 .9
48.6
46.3
43.3
49.5
37.7
40.2
48.4
41 .5
44.5
42.4
36.6
39.2
40.9
Nitrate, Nitrate + Nitrite
(10 ma/Ll
8.7
10.3
9.4
9.4
9.2
10.0
10.0
10.0
10.1
10.6
10.2
9.8 ''fl
7.3
7.9
9.5
#NIA
7.3
6.8
7.0
6.6
6.8
6.9
6.7
6.4
6:s
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
5.9
6.90
7.05
5.68
6.70
TW4-12
Sampling Event
TABLE 1 (15 of 33)
Historic Summary Of Monitoring Well Analytical Results Up To The 2nd Quarter 2023
Chloroform Contamination Investigation
OUSA White Mesa Mill
Parameter
IGWQSI
Carbon Tetrachloride Chloroform Chloromethane Methylene Chloride Chloride
15 ua/L) (70 ua/LI 130 ua/LI 15 "g/L) Na GWQS (mg/Ll
1st0tr 3/16/2005 NA <1.0 NA NA
2ndQtr 5/25/2005 NA <1.0 NA NA
3rnQtr 8/31/2005 <1.0 <1.0 5.8 <1.0
4th Qtr 12/7/2005 <1.0 <1.0 1.0 <1.0
1stQtr 3/9/2006 <1.0 <1.0 2.6 <1.0
2nd Ctr 6/14/2006 <1.0 <1.0 1.4 <1.0
3rnatr 7/20/2006 <1.0 <1.0 1.4 <1.0
4th Qtr 11/8/2006 <1.0 <1.0 <1.0 <1.0
1st Qtr 2128/2007 <1.0 <1.0 <1.0 <1.0
2nd Ctr 6/27/2007 <1.0 <1.0 <1.0 <1.0
3rnQtr 8/15/2007 <1.0 <1.0 <1.0 <1.0
4th Qtr 10/10/2007 <1.0 <1.0 <1.0 <1.0
1st0tr 3/28/2008 <1.0 <1.0 <1.0 <1.0
2nd Ctr 6/25/2008 <1.0 <1.0 <1.0 <1.0
3rd Qtr 9/10/2008 <1.0 <1.0 <1.0 <1.0
4th Ctr 10/15/2008 <1.0 <1.0 <1.0 <1.0
~ 3/11/2009 <1.0 <1.0 <1.0 <1.0
2ndQtr 6/23/2009 <1.0 <1.0 <1.0 <1.0
3rd Qtr 9/14/2009 <1.0 <1.0 <1.0 <1.0
4th Qtr 12116/2009 <1.0 <1.0 <1.0 <1.0
1stQtr 2123/2010 <1.0 <1.0 <1.0 <1.0
2ndQtr 6/14/2010 <1.0 <1.0 <1.0 <1.0
3rdQtr 8/10/2010 <1.0 <1.0 <1.0 <1.0
4th Qtr 10/15/2010 <1.0 <1.0 <1.0 <1.0
1statr 2115/2011 <1.0 <1.0 <1.0 <1.0
2ndQtr 5/25/2011 <1.0 <1.0 <1.0 <1.0
3rnQtr 8/16/2011 <1.0 <1.0 <1.0 <1.0
4th Qtr 11/15/2011 <1.0 <1.0 <1.0 <1.0
·1sro1rTI1 1,1112012 <1.0 <1.0 <1.0 <1.0
2nd Qtr 5/31/2012 <1.0
<1.0 ____ <1.0 ______ <1.0------
3rnatr 8/29/2012 <1.0 <1.0 <1.0 <1.0
4th Qtr 10/312012 <1.0 <1.0 <1.0 <1.0
1stQtr 2113/2013 <1.0 <1.0 <1.0 <1.0
2ndQtr 5/29/2013 <1.0 <1.0 <1.0 <1.0
3rnQtr 8/29/2013 <1.0 <1.0 <1.0 <1.0
4th Qtr 11/6/2013 <1.0 <1.0 <1.0 <1.0
1st Ctr 1/2212014 <1.0 <1.0 <1.0 <1.0
2ndQtr 5/21/2014 <1.0 <1.0 <1.0 <1.0
3rd Qtr 8/27/2014 <1.0 <1.0 <1.0 <1.0
4~7 g:; .. ---· 1~j~~~~~: <1.0 <1.0 <1.0 <1.0
<1.0 <1.0 ,,.:"1.o <1.0
2ndQtr 6/10/2015 <1.0 <1.0 <1.0 <1.0
3rnQtr 9/212015 <1.0 <1.0 <1.0 <1.0
4th Qtr 10/21/2015 <1.0 <1.0 <1.0 <1.0
Q!P,!?,te TW4-65 <1.0 <1.0 <1.0 <1.0
1st Qtr 3/15/2016 <1.0 <1.0 <1.0 <1.0
2nd Qtr 5/25/2016 <1.0 <1.0 <1.0 <1.0
Deolocale1W4-( 5/25/2016 <1.0 <1.0 <1.0 <1.0
3rdQtr 7/27/2016 <1.0 <1.0 <1.0 <1.0
4th Qtr 1.0/1212016 <1.0 <1.0 <1.0 <1.0
1stQtr 3/14/2017 <1.0 <1.0 <1.0 <1.0
2nd Qtr 6/14/2017 <1.0 1.25 <1.0 <1.0
3rnatr 8/212017 <1.0 1.2 <1.0 <1.0
Deplicale TW4-70 <1.0 1.19
4thQtr 10/10/2017 <1.0 <1.0
O....J.,.,.teTW4-70 <1.0 <1.0
1st Qtr 3/14/2018 <1.0 <1.0
2nd Qtr 6/1212018 <1.0 <1.0
3rn Qtr 8/29/2018 <1.0 <1.0
4thQtr 11/30/2018 <1.0 <1.0
1st Otr 3/16/2019 <1.0 <1.0
2nd Otr 6/13/2019 <1.0 <1.0
3rnatr 9/11/2019 <1.0 <1.0
4th Ctr 12114/2019 <1.0 <1.0
1st Qtr 3/17/2020 <1.0 <1.0
2nd Qtr 6/11/2020 <1.0 <1.0
3rd Qtr 9/17/2020 <1.0 <1.0
4thQtr 11/4/2020 <1.0 <1.0
1st Qtr 3/17/2021 <1.0 <1.0
2nd Qtr 6/15/2021 <1.0 <1.0
3rn Otr 9/15/2021 <1.0 <1.0
4thQtr 12/7/2021 <1.0 <1.0
1st Qtr 3/15/2022 <1.0 <1.0
2nd Otr 6/15/2022 <1.0 <1.0
3rn Qtr 9/13/2022 <1.0 <1.0
4th Qtr 12/7/2022 <1.0 <1.0
D.....i.,.,.teTW4-65 <1.0 <1.0
1stQtr 3/2212023 <1.0 <1.0
2nd Qtr 6/15/2023 <1.0 <1.0
(1) As of March 2012 both north and south wild life ponds no l()OQ!"J'eceiv11~ water
NA = not analyzed
Shaded indicates 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
NA
NA
NA
19
19
16
16
16
16
18
29
16
16
19
18
22
23
22
22
23
22
29
35
31
31
32
31
30
28 -34
39
39
36.7
38.6
41.7
41.4
41.6
40.2
47
50.2
50.6
56
60.2
51
51.3
56.2
66.4
67
67.5
72.6
62.6
67.2
65.3
67
56.2
61.4
59.5
53.6
59.9
56.1
50.8
55.3
52.6
58.0
53.0
51.7
50.3
48.0
52.0
51.8
36.1
49.8
25.8
53.3
57.9
49.2
50.9
35.9
43.6
Nitrate, Nitrate + Nitrite
I10mo/LI
1.4
1.6
1.5
1.4
1.3
1.4
1.4
1.4
1.5
1.5
1.4
1.4
1.6
2.7
2.7
2.5
2.4
3.8
5.1
3.6
4.0
11.0
9.0
8.0
6.5
7.0
6.8
8.0
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
8.04
6.39
4.95
2.34
5.91
3.10
2.39
1.95
1.46
8.4
16.0
13.8
4.68
7.02
2.84
4.7
TW4-13
Sampling Event
TABLE 1 (16 of 33)
Historic Summary Of Monitoring Well Analytical Results Up To The 2nd Quarter 2023
Chloroform Contamination Investigation
OUSA White Mesa Mill
Carbon Tetrachloride Chloroform Chloromethane
(5 pg/L) 170 ua/L) (30 ua/L)
Parameter
IGWQSI
Methylene Chloride
(Spg/L)
Chloride
No GWQS Ima/LI
Nitrate, Nitrate + Nitrite
(10mg/L)
1st Qtr 3/16/2005 NA <1.0 NA 4.2 NA NA
2nd Qtr 5/25/2005 NA <1.0 NA 4.3 NA NA
3rd Qtr 8/31/2005 <1.0 <1.0 NA 4.6 3.1 <1.0
th Qtr 12/7/2005 <1.0 <1.0 -7-='P"'-------I----···· ._6,,,9'+----·············································· 4.2 st Qtr 3/9/2006 <1.0 <1.0 67 4.1 <1.0 <1.0
1.7 <1.0
1.4 <1.0 2nd Qtr 6/14/2006 <1.0 <1.0 66 4.9
3rd Qtr 7/20/2006 <1.0 <1.0 65 4.3 <1.0 <1.0
'§/f ~£~~:~ :1 g :1 g '-",,----·--+------~i+--------'~".~"II <1.0 <1.0
<1.0 <1.0
Qtr 6/27/2007 <1.0 <1.0 59 4.6 <1.0 <1.0
Qtr 8/15/2007 <1.0 <1.0 58 4.4 <1.0 <1.0 g:; 1~;~~;~~g!1-:'-':~g-----.J-:'-':~g---l-----+-e7----··········+------~: !~ <1.0 <1.0
<(O <1.0
l Qtr 6/25/2008 <1.0 <1.0 58 4.2 <1.0 <1.0
Qtr 9/10/2008 <1.0 <1.0 50 4.3
~}·-10~~:;~gg~l-':")"'g------lf":-":-"'g---f..c.:1'-'g:c------+:'-')"'g'--------+--------"~:"I· -1-------'!"':~~I
<1.0 <1.0
Qtr 6/23/2009 <1.0 <1.0 <1.0 <1.0 57 1.2
Qtr 9/14/2009 <1.0 <1.0 <1.0 <1.0 63 4.7 Z:"-;----"1~ec~,.,~"'~~"'g"'~~'-"'-:"'~:"'g------f:::.:"':~'----+:,.,:"':~'-------1;f"'g------1-----·· ·····1~ -···--·········································· H
Qtr 6/14/2010 <1.0 <1.0 <1.0 <1.0 53 5.2
Qtr 8/10/2010 <1.0 <1.0 <1.0 <1.0 55 5.6
~; 1~:~~g:~ :L"'g------1..:::"')"'g---f:-'-:"'g'-----+:")""g------l••········ ~~ ~::
Qtr 5/25/2011 <1.0 <1.0 <1.0 <1.0 56 6.4
Qtr 8/16/2011 <1.0 <1.0 <1.0 <1.0 60 . 5.2
&~,r 11'.)~;~gg,-:~::=g-----::g :1g ::g ··················· ~ ~:
Qtr 5/31/2012 <1.0 ___ --<1.0 ____ <1.0 ______ <1.0 ---------59 -----------6.0
Qtr 8/29/2012 <1.0 <1.0 <1.0 <1.0 60 6.2
1st g;; ~1~~g:~ ~tg'c'---------J:: g'----1-:'-'1""g'------...J.C:"")"'g----596~ s\1
2nd Qtr 5/29/2013 <1.0 <1.0 <1.0 <1.0 56 6.8
3rd Qtr 8/29/2013 <1.0 <1.0 <1.0 <1.0 63.5 ' 7.16
4th Qtr 11/6/2013 <1.0 <1.0 <1.0 <1.0 58.5 6.48
1st Qtr 1/22/2014 <1.0 <1.0 <1.0 ·· <1.0 63.1 7.09
2nd Qtr 5/21/2014 <1.0 <1.0 <1.0 <1.0 56.1 5.99
3rd Qtr 8/23/2014 <1.0 <1.0 <1.0 <1.0 62 4.8
4th Qtr 10/23/2014 <t .0 <1.0 <t .0 <1.0 66.1 6.28 1statr a,1112015 <t:o <1.0 ............... <i:o <1.0 66.4 1.oii
2ndQtr 6/10/2015 <1.0 <1.0 <1.0 <1.0 70.3 6.32
3rd Qtr 9/2/2015 <1.0 <1.0 <1.0 <1.0 76.5 5.7
4th Qtr 1012112015 <1.0 <1.o,_ __ .:<:.,1"'.o'-------i::.<1"'."-o _____ -1--____ _,6,.,,5,,.5'+---------"5".7.,,811 1stQtr 3/16/2016 <1.0 <TO <1.0 <1.0 69.4 7.97
2nd Qtr 5/25/2016 <1.0 <1.0 <1.0 <1.0 71.8 5.87
3rdQtr 7/28/2016 <1.0 <1.0 <1.0 <1.0 69.3 6.14
4th Qtr 10/19/2016 <1.0 <1.0 <1.0 <1.0 .J.0,.9>------········~1!)
1st Qtr 3/16/2017 <1.0 <1.0 <1.0 <1.0 66.0 6.05
2nd Qtr 6/15/2017 <1.0 <1.0 <1.0 <1.0 70.4 6.49
3rdQtr 8/2/2017 <1.0 <1.0 <1.0 <1.0 70.5 6.15 ti~; 1~'.1~~g:! :: g --+:°'1"'g'--'--+=:")"'g'-------i::.::"':g,,__ ____ -+-----~~H ~)!
2nd Qtr 6/12/2018 <1.0 <1.0 <1.0 <t.0 65.0 6.24
3rd Qtr 8/29/2018 <1.0 <1.0 <1.0 <1.0 73.7 5.13
4thQtr 11/30/2018 <1.0 <1.0 <1.0 <1.0 64.5 5.29
1st air 3/16/2019 <1.0 <1.0 <1.0 <1.0 61.6 5.74
2nd Qtr 6/13/2019 <1.0 <1.0 <1.0 <1.0 65.4 6.56
3rd Qtr 9/11/2019 <1.0 <1.0 <1.0 <1.0 65.3 5.19 ~~~g:; 1t1~;~g~~ :1g ~,i :1,g----•~:1g'--------+-----:~~ \
1
~
2nd Qtr 6/11/2020 <1.0 <1.0 <1.0 <1.0 62.7 9.0
3rd Qtr 9/17/2020 <1.0 <1.0 <1.0 <1.0 60.2 5.25
4th Qtr 11/4/2020 <1.0 <1.0 <1.0 <1.0 ............. 60.6 ....... 4.,.9?
1,i-Qtr 3/17/2021 <1.0 ·.ro <1.0 <1.0 67.3 5.57
2nd Qtr 6/15/2021 <1.0 <1.0 <1.0 <1.0 57.7 2.9
3rd Qtr 9/15/2021 <1.0 <1.0 <1.0 <1.0 54.2 4.80
4th Qtr 12/7/2021 <1.0 <1.0 <1.0 <1.0 61.0 5.06
1st Qtr 3/16/2022 <1.0 <1.0 <1.0 <1.0 59.2 4.80
2nd Qtr 6/15/2022 <1.0 <1.0 <1.0 <1.0 62.6 4.5
3rd Qtr 9/13/2022 <1.0 <1.0 <1.0 <1.0 62.4 4.37
4th Qtr 12/7/2022 <1.0 <1.0 <1.0 <1.0 56.9 4.87
1st Qtr 3/23/2023 <1.0 ·•'i'.O <1.0 <1.0 5f5· 4.47
2nd Qtr 6/15/2023 <1.0 <1.0 <1.0 <1.0 63.2 4.6
(1) As of March 2012 both north and south wild llfe ponds no lon51:r receIvIng water
NA = not analvzed
Shaded indicates concentrations exceedinQ GWQS
TW4-14
Sampling Event
TABLE 1 (17 of33)
Historic Summary Of Monitoring Well Analytical Results Up To The 2nd Quarter 2023
Chloroform Contamination Investigation
Carbon Tetrachloride
(5 ua/Ll
DUSA White Mesa Mill
Parameter
(GWQS)
Chloroform Chloromethane Methylene Chloride Chloride
(70 ua/L) (30 ua/L) (5 ua/L) No GWQS (mg/L)
Nitrate, Nitrate + Nitrite
(10 mg/L)
1st Qtr 3/16/2005 NS NS NS NS NS NS
2nd Qtr 5/25/2005 NS NS NS NS NS NS
3rd Qtr 8/31/2005 NS NS NS NS NS NS ~: g:; J~~~~ ~~~-------,·~=~----f~""~:C------r.~""~;-------t·~~;------E·~c~,------
2nd Qtr 6/14/2006 NS NS NS NS NS NS
3rd Qtr 7/20/2006 NS NS NS NS NS NS
4th Qtr 11/8/2006 <1.0 NS <1.0 <1.0 37.,._ _______ .2.4
1st Qtr 2/28/2007 <1.0 <1.0 <1.0 <1.0 38 f:i
2ndQtr 6/27/2007 <1.0 <1.0 <1.0 <1.0 38 1.4
3rd Qtr 8/15/2007 <1.0 <1.0 <1.0 <1.0 36 1.1
-1!!!_Qtr 10/10/2007 <1.0 <1.0 <1.0 <1.0 38 0.8
1st Qtr 3/28/2008 <1.0 <1.0 <1.0 <1.0 57 0.4
2nd atr 6/25/2008 <1.0 <1.0 <1.0 <1.0 35 1.6
3rd Qtr 9/10/2008 <1.0 <1.0 <1.0 <1.0 34 1.38 ~: g:; 10~~fJgg: tg :}l--~Jg 1: g 1~ 0,1~
2nd Qtr 6/23/2009 <1.0 <1.0 <1.0 <1.0 36 1.4
3rd Qtr 9/14/2009 <1.0 <1.0 <1.0 <1.0 38 1.5
4th Qtr 12/16/2009 <1.0 <1.0 <1.0 <1.0 34 1.4
1st atr ··:112312010 <1·.o ·•Til <1.0 <1.0 33 2.5
2nd Qtr 6/14/2010 <1.0 <1.0 <1.0 <1.0 49 2.9
3rdQtr 8/10/2010 <1.0 <1.0 <1.0 <1.0 35 2.8
4th Qtr 10/15/2010 <1.0 <LO ........................... <1,0 <1.0 29 2.9
1stQtr 2/15/2011 <1.0 <1.0 <1.0 <1.0 25 1.8
2nd Qtr 6/24/2011 <1.0 <1.0 <1.0 <1.0 24 1.4
3rd Qtr 8/16/2011 <1.0 <1.0 <1.0 <1.0 33 2.6
4th Qtr 11/15/2011 <1.0 <1.0 <1.0 <1.0 15 1.7 1s!Otr!1)" ................ 1/17/2012 <1.0 <1.0 <1.0 <1.0 20 1.9 2ndQtr ---6/14/2012 <1.0 _________ <1.0 ____ <TO ______ <1.0----------35 -----------3.3
3rd Qtr 8/29/2012 <1.0 <1.0 <i .0 <1.0 37 3.9
4th Qtr 10/3/2012 <1.0 <1.0 <1.0 <1.0 37 3.9
1st Qtr 2/7/2013 <1.0 <1.0 <1.0 <1.0 35.2 4.6
2nd Qtr 5/29/2013 <1.0 <1.0 <1.0 <1.0 38.6 4.4
3rd Qtr 8/29/2013 <1.0 <1.0 <1.0 <1.0 37.6 4.51
4th Qtr 11/6/2013 <1.0 <1.0 <1.0 <1.0 38.5 4.81 1st Qtr 1/22/2014 <1.0 <1.0 · ········· ·•iil <1.0 35.5 5.92
2nd Qtr 5/21/2014 <1.0 <1.0 <1.0 <1.0 32.5 4.87
3rd Qtr 8/13/2014 <1.0 <1.0 <1.0 <1.0 38 4.1
4th Qtr 10/23/2014 <1.0 <1.0 <1.0 <1.0 38.9 5.22 1stQtr 3/12/2015 <1.0 1.7 <1.0 <1.0 .......... ·· ....... 40.1 ······5:;fa
2nd Qtr 6/10/2015 <1.0 1.82 <1.0 <1.0 41.8 3.55
3rd Qtr 9/3/2015 <1.0 <1.0 <1.0 <1.0 42.4 2.77
1e~c'~~~gi"'t~;---1'-S~cc;f'=~°';~'="g}cc!c+:-:'"g,------+----c!·: ::~g----+"-L9'----~2~.1~8+------"!~J H!
2nd Qtr 5/26/2016 <1.0 6.15 <1.0 3.18 43.6 2.45
3rd Qtr 8/3/2016 <1.0 5 <1.0 1.8 42.4 2.88
~: g:; J~~~g~,:1 g ~.~~ ~}g ~~: :;.: ~:
2nd Qtr 6/15/2017 <1.0 6.85 <1.0 <1.0 46.9 5.12
3rd atr 8/2/2017 <1.0 6.14 <1.0 <1.0 46.4 4.84
4th Qtr 10110120='1cc1+-<c.;1"'.o;-_____ t---"'6.c-13cl-'<c'1.=0 ___ __,<1,0, ____ -=-c~------;;,'2.5.______ 4.73 1stQtr 3/15/2018<1.0 5.8<1.0 2.18 51.5 5.67
2nd Qtr 6/13/2018 <1.0 5.12 <1.0 <1.0 46.9 6.36
3rd Qtr 8/30/2018 <1.0 4.78 <1.0 <1.0 54.1 5.34
~tr 12/12/2018 <1.0 4.41 <1.0'----+-<~1.~0-----+------'~8~.7+-------~5~.8451 1st Qtr 3/16/2019 <1.0 4.08 <1.0 <1.0 48.7 6.16
2nd Qtr 6/13/2019 <1.0 4.18 <1.0 <1.0 48.3 5.86
3rd Qtr 9/11/2019 <1.0 8.08 <1.0 <1.0 45.4 4.77
4th Qtr 12/14/2019 <1.0 3.83 <1.0 <1.0 49.4 4.76
1stQtr 3/17/2020 <1.0 2.98 <1.0 <1.0 48.4 6.I7
2nd Qtr 6/11/2020 <1.0 2.87 <1.0 <1.0 47.6 6.57
3rd Qtr 9/18/2020 <1.0 2.41 <1.0 <1.0 45.1 5.57
4th Qtr 11/4/2020 <1.0 2.69 <1.0 <1.0 49.7 5.81
1st Qtr 3/18/2021 <1.0 1.77 <1.0 <1.0 4/f;f 5.56
2nd Qtr 6/16/2021 <1.0 <1.0 <1.0 <1.0 49.5 7.02
3rd Qtr 9/15/2021 <1.0 <1.0 <1.0 <1.0 34.1 5.56
11c'~th'cQ'cct~r __ --c1cc21-=8/2=02"1+<-'c1cc.o,_ ____ __,<1~.~o __ -+<~1~.o'-----+-<~1.~o _____ -+-_____ 49_0 5.70
1stQtr 3/16/2022 <1.0 ·•1.0 <1.0 <1.0 42.0 5.9
2nd Qtr 6/16/2022 <1.0 1.0 <1.0 <1.0 48.4 5.30
3rd Qtr 9/14/2022 <1.0 1.1 <1.0 <1.0 42.2 4.78 ~:g:; ~%~~g~~ ::g~------t::g ::.g ::g'------+-----~:~='.~! ~j~
2nd Qtr 6/15/2023 <1.0 <1.0 <1.0 <1.0 50.0 6.12
(1) As of March 2012 both north and south wild hfe ,e;inds no lon~r receIvu~ water
NS= not sampled
Shaded indicates concentrations exceeding GWQS.
TW4-16
Sampling Event
TABLE 1 (18 of 33)
Historic Summary Of Monitoring Well Analytical Results Up To The 2nd Quarter 2023
Chloroform Contamination Investigation
DUSA White Mesa Mill
Parameter
IGWQSI
Carbon Tetrachloride Chloroform Chloromethane Methylene Chloride Chloride Nitrate, Nitrate + Nitrite
15 ug/L) 170 ua/LI 130 ug/L) 15 ~g/L) No GWQS lmg/Ll 110 mg/L)
1statr 3/16/2005 NA 240 NA
2nd Qtr 5/25/2005 NA 212 NA
3rnQtr 8/31/2005 <1.0 85 3.2
4th Qtr 12/7/2005 <1.0 14 2.6
1stQtr 3/9/2006 <1.0 39 1.1
2nd Qtr 6/14/2006 <1.0 13 2.4
3rd Qtr 7/20/2006 <1.0 5.2 <1.0
4th Qtr 11/8/2006 <1.0 13.6 <1.0
1stQtr 2128/2007 <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
1st0tr 3/28/2008 <1.0 11 <1.0
2nd Otr 6/25/2008 <1.0 <1.0 <1.0
3rn atr 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 Otr 6/23/2009 <1.0 <1.0 <1.0
3rn a tr 9/14/2009 <1.0 <1.0 <1.0
4th Qtr 12117/2009 <1.0 <1.0 <1.0
1s!Qlr 3/24/2010 <1.0 <1.0 <1.0
2nd Otr 6/14/2010 <1.0 2.1 <1.0
3rn Qtr 8/24/2010 <1.0 4.3 <1.0
4th Qtr 10/15/2010 <1.0 3 <1.0
1stQtr 212212011 <1.0 15 <1.0
2nd Qtr 5/26/2011 <1.0 16 <1.0
3rn Qtr 8/17/2011 <1.0 9.2 <1.0
4th Otr 11/16/2011 NA NA NA
11) 12/7/2011 <1.0 <1.0 <1.0
lstaffl3) 111e12012 <1.0 <1.0 <1.0
2nd Otr -5/26/201 2 <1.0 <1.0 ____ <TO ______
3rn a tr 8/30/201 2 <1.0 <1.0
4th Qtr 10/3/2012 <1.0 <1.0
1stOtr 2/7/2013 <1.0 <1.0
2nd Qtr 5/30/2013 <1.0 <1.0
3rnatr 9/5/2013 <1.0 <1.0
4th Qtr 1117/2013 <1.0 "fSt""Qtr 1/29/2014 <1.0
2nd Otr 5/2212014 <1.0
3rn atr(2l 8/14/2014 <1.0
3rnQtr 9/24/2014 <1.0
4th Qtr 10/29/2014 <1.0 ·1·s1-·atr 3/1212015 <1.0 ,_
2nd Qtr 6/11/2015 <1.0
3rnQtr 9/3/2015 <1.0
4th Qtr 10/28/2015 <1.0
1st Otr 3/17/2016 <1.0
2nd Otr 5/26/2016 <1.0
3rdOtr 8/3/2016 <1.0
4th Qtr 10/26/2016 <1.0
1stOtr 3/16/2017 <1.0
2nd Otr 6/20/2017 <1.0
3rnatr 8/3/2017 <1.0
4th Qtr 10/11/2017 <1.0
pw~_~C ~it samnle <0.95
1st Qtr 3/20/2018 <-fo
Duplicate TW4-75 <1.0 -2nd Otr 6/14/2018 <1.0
3rd Qtr 8/30/2018 <1.0
4th Qtr 1211212018 <1.0
1st Qtr 3/19/2019 .:''1.0
2nd Qtr 6/19/2019 <1.0
3rnQtr 9/1212019 <1.0
4th Otr 12114/2019 <1.0
Duolicate TW4--75 <1.0
1st Qtr 3/18/2020 <1.0
2nd Qtr 6/1212020 <1.0
3rd Otr 9/19/2020 <1.0
4th Qtr 11/11/2020 <1.0
Duplicate TW4-75 <1.0
DWMRC s lit samnle <10
1st Qtr 3/24/2021 <1.0
2nd Qtr 6/17/2021 <1.0
3rdOtr 9/23/2021 <1.0
4th Qtr 1218/2021 <1.0
1stOtr 3/23/2022 <1.0
2nd Otr 6/2212022 <1.0
3rdOtr 9/15/2022 <1.0
4th Qtr 1219/2022 <1.0
1stQtr 3/29/2023 <1.0
Duplicate TW4-75 <1.0
2nd Qtr 6/21/2023 <1.0
(1) voes were resampled because laboratory missed holding time
(2) voes were resampled
<1.0
<1.0
<1.0
<1.0
<1.0
13.4 <1.0
6.93 :;;:i.-o
_!!§_ <1.0
229 <1.0
371 <1.0
387 <1.0
153 <1.0
65.3 <1.0
82 <1.0
112 <1.0
45.9 <1.0
93.4 <1.0
49 <1.0
92.9 <1.0
19.1 <1.0
64.3 <1.0
143 <1.0
98 <1.0
92 <1.5
170 <1.0
171 <1.0
54.5 <1.0
54.5 <1.0
52.0 <1.0
60.6 <1.0
76.2 <1.0
99.B <1.0
94.3 <1.0
91.0 <1.0
113 <1.0
141 <1.0
220 <1.0
270 <1.0
277 <1.0
290 <20
248 <1.0
247 <1.0
202 <1.0
189 <1.0
150 <1.0
120 <1.0
138 <1.0
152 <1.0
179 ·<1:0
178 <1.0
227 <1.0
(3) As of March 2012 botl'I north and soutl'I wild life ponds no longer receiving water.
NA = not analyzed
Shaded indicates concentrations exceedinQ GWQS
J = Approximate value
H = Sample was analyzed beyond holdini;i times and may not be accureate concentration.
NA NA <0.1
NA NA <0.1
43 NA <0.1
5.9 64 1.4
21 60 3
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 _________ j B, --------........... 0.1
<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 BO 5.1
<1.0 NA NA
<1.0 92.1 8.4
<1.0 65 43
<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 2.78
<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
<1.0 93.2 4.2
<1.0 89.8 4.41
<1.0 91 .0 4.75
<1.0 88.5 5.69
<1.0 92.5 5.09
<1.0 94.2 5.0
TABLE 1 (19 of 33)
Historic Summary Of Monitoring Well Analytical Results Up To The 2nd Quarter 2023
Chloroform Contamination Investigation
OUSA White Mesa Mill
TW4-18 Parameter
Sampling Event IGWQSl
Carbon Tetrachloride Chloroform Chloromethane Methylene Chloride Chloride
15 ug/Ll (70 uo/Ll 130 ,m/Ll 15 ug/L) No GWQS Ima/LI
1stQtr 3/16/2005 NA 38 NA NA NA
2ndQtr 5/25/2005 NA 29.8 NA NA NA
3rdQtr 8/31/2005 <1.0 39 2.8 <1.0 NA
4thQtr 12/7/2005 <1.0 14 1.1 <1.0 41
1st Qtr 3/9/2006 <1.0 12 1.6 <1.0 36
2ndQtr 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
1statr 2/28/2007 <1.0 9.2 <1.0 <1.0 30
2ndQtr 6/27/2007 <1.0 8 <1.0 <1.0 28
3rdQtr 8/15/2007 <1.0 8.9 <1.0 <1.0 32
4thQtr 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
3rdQtr 9/10/2008 <1.0 8 <1.0 <1.0 26
4th0tr 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
2ndatr 6/23/2009 <1.0 16 <1.0 <1.0 30
3rd Qtr 9/14/2009 <1.0 13 <1.0 <1.0 26
4thQtr 12/17/2009 <1.0 8.2 <1.0 <1.0 30
1stQtr 3/24/2010 <1.0 69 <1.0 <1.0 41
2ndQtr 6/14/2010 <1.0 29 <1.0 <1.0 35
3rd Qtr 8/12/2010 <1.0 29 <1.0 <1.0 37
4thQtr 10/15/2010 <1.0 30 <1.0 <1.0 50
1st Otr 2/22/2011 <1.0 39 <1.0 <1.0 52
2nd Qtr 5/26/2011 <1.0 26 <1.0 <1.0 36
3rdQtr 8/17/2011 <1.0 29 <1.0 <1.0 23
4th Qtr 11/16/2011 NA NA NA NA 23
1s101rm---lffa~§B <1.0 28 <1.0 <1.0 !':!.~
'<1.0 25 <1.0 <1.0 18
2nd Qtr -6/13/2012 <1.0 -----24 <1.0 ______ <1.0--------------30
3r<I 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
1stQtr 2/13/2013 <1.0 34.9 <1.0 <1.0 23.1
12nd Qtr 6/13/2013 <1.0 37.9 <1.0 <1.0 22.9
13rd Qtr 9/5/2013 <1.0 41 <1.0 <1.0 36.2
14th Qtr 11/13/2013 <1.0 44.3 <1.0 <1.0 37.1
1st Otr 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
Qtr 10/28/2014 <1.0 33 <1.0 <1.0 40.8
Qtr 3/12/2015 <1.0 32 <1.0 <1.0 41.6
Qtr 6/11/2015 <1.0 30.5 <1.0 <1.0 43.5
Qtr 9/3/2015 <1.0 28.7 <1.0 <1.0 47.6
Qtr 10/28/2015 <1.0 52.9 <1.0 <1.0 39.4
Qtr 3/17/2016 <1.0 56:s <1.0 <1.0 40.7
Qtr 6/8/2016 <1.0 60 <1.0 <1.0 43.8
Qtr 8/3/2016 <1.0 56.3 <1.0 <1.0 40.7
Qtr 10/26/2016 <1.0 60.1 <1.0 <1.0 43.9
Qtr 3/16/2017 <1.0 62 <-1.0 <1.0 39.4
TW4-75 <1.0 61.5 <1.0 <1.0 41 .1
6/20/2017 <1.0 63.8 <1.0 <1.0 41 .6
8/3/2017 <1.0 62.8 <1.0 <1.0 40.4
TW4-75 <1.0 62.3 <1.0 <1.0 41 .5
4th Otr 10/11/2017 <1.0 62.9 <1.0 <1.0 37.1
1stOtr 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
3rdQtr 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
DuplicateTW4-75 <1.0 54.4 <1.0 <1.0 40.8
3rdQtr 9/11/2019 <1.0 56.2 <1.0 <1.0 36.8
4th Otr 12/18/2019 <1.0 62.0 <1.0 <1.0 42.7
1st Otr 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
3rdQlr 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
DWMRC sP.!it samole <10 56.0 <20 <20 41 .0
1stOtr 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
3rdQtr 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
1st Otr 3/23/2022 <1.0 56.0 <1.0 <1.0 39.1
2nd atr 6/22/2022 <1.0 62.9 <1.0 <1.0 48.1
3rd Qtr 9/14/2022 <1.0 60.6 <1.0 <1.0 44.7
4th Qtr 12/9/2022 <1.0 62.6 <1.0 <1.0 44.4
0~4-75 <1.0 67.9 <1.0 <1.0 45.2
1st Otr 3/29/2023 <1.0 54.4 <1.0 <1.0 45.6
2nd Otr 6/21/2023 <1.0 54.6 <1.0 <1.0 47.1
(1) VOCa were resampled because laboratory missed holding time. (2) As or March 2012 both north and south wlld life ponds no longer receiving water.
NA = not analyzed
Shaded indicates concentrations exceedinA GWCS.
Nitrate, Nitrate + Nitrite
110ma/Ll
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
52
6.2
5.9
5.4
5.1
9.0
9.0
10.0
1M
9.0
4.6
6.3
NA
4.4
6.6
6.6
6.0
5.6
8.9
12.1
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 Jes
4.01
2.95
3.25
3.02
3.71
3.62
3.36
3.67
3.30
3.61
3.62
3.37
3.90
3.4
3.4
3.46
3.60
3.63
3.40
3.40
TW4-19
(chlorofrom pumping well started
4/30/03)
Sampling Event
TABLE 1 (20 of 33)
Historic Summary Of Monitoring Well Analytical Results Up To The 2nd Quarter 2023
Chlorofonn Contamination Investigation
OUSA White Mesa Mill
Parameter
(GWQS)
Carbon Tetrachloride Chlorofonn Chloromethane Methylene Chloride Chloride Nitrate, Nitrate+ Nitrite
15 uo/Ll (70 uo/Ll 130 un/LI 15 uolL) No GWQS (mo/L) (10mo/L)
1stQtr 3/16/2005 NA 2,200 NA NA
2ndQtr 5/25/2005 NA 1,200 NA NA
3rdQtr 8/31/2005 <5.0 1,400 <5.0 <5.0
4th Qtr 12n/2005 <50 2,800 <50 <50
1stQtr 3/9/2006 <50 --1,200 <50 <50
2nd Qtr 6/14/2006 <50 1,100 <50 <50
3rdQtr 7/20/2006 <50 1,120 <50 <50
4th Qtr 11/8/2006 1.6 ........ 1,050 2.6 <1.0
1stQtr 2128/2007 1.3 1,200 <1.0 <1.0
2ndQtr 6/27/2007 Did not sample
3rd Ctr 8/15/2007 1.9 1,100 <1.0 <1.0
4th Qtr 10/10/2007 1.9 1,100 <1.0 <1.0 -··-· 1st Qtr 3/28/2008 2.9 1:800 <1.0 <1.0
2ndOtr 6/25/2008 <1.0 1,000 <1.0 <1.0
3rdQtr 9/10/2008 8.6 3,600 <1.0 <1.0
4th Otr 10/15/2008 12 4,200 <1.0 <1.0
1stQtr 3/4/2009 1.2 --1-,100 <1.0 <1.0
2ndOtr 6/23/2009 1.2 990 <1.0 <1.0
3rd Otr 9/14/2009 15 6.600 <1.0 <1.0
4th Qtr 1212212009 16 __ 4,700 <1.0 <1.0
1stOtr 2117/2010 1.3 940 <1.0 <1.0
2ndQtr 6/14/2010 4.2 1,800 <1.0 <1.0
3rd Qtr 8/16/2010 4.9 2,000 <1.0 <1.0
4th atr 10/15/2010 1.3 1,200 <1.0 <1.0
1statr 2117/2011 17 -3.400 <1.0 <1.0
2ndatr 6/7/2011 8.3 4,000 <1.0 <1.0
3rd Qtr 8/17/2011 2.1 970 <1.0 <1.0
4th Qtr 11/16/2011
(1) 1215/2011 5.4 2,200 <1.0 <1.0
lsHllrf21 112312012 1.5 650 <1.0 <1.0
2nd Qtr 6/6/2012 1,1 ----4 60 <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
1st Otr 2113/201j 5.15 4,210 <1.0 <1.0
2nd Qtr 6/5/2013 5.15 2,070 <1.0 <1.0
3rdQtr 913/2013 20.7 8,100 <1.0 <1.0
4thQtr 10/29/2013 6.42 ------·-942 <1.0 <1.0
1st Qtr 1/27/2014 4.05 586 <1.0 <1.0
2nd Qtr 5/19/2014 5.51 810 <1.0 <1.0
3rdQtr 8/11/2014 1.9 1.410 8.3 <1.0
4thQtr 10/21/2014 4.8 4.310 <1.0 <1.0
1st Otr 319/2015 8.92 --4,660 <1.0 <1.0
2nd Qtr 6/8/2015 2.62 1,570 <1.0 <1.0
3rd Qtr 8/31/2015 <1.0 7,860 7.78 <1.0
4thOtr 10/19/2015 12.2 7,840 5.46 <1.0
1st Otr 319/2016 13.5 7,780 1.4 <1.0
2nd Qtr 5/26/2016 23.1 12,600 <1.0 <1.0
3rd Qtr 7/25/2016 9.89 6,040 <1.0 <1.0
4th Qtr 10/13/2016 10.8 6,640 <1.0 <1.0
1stQtr 318/2017 3.06 ;-:24o' <1.0 <1.0
2nd Qtr 6/13/2017 1.35 510 <1.0 <1.0
3rd Qtr 7126/2017 13.0 8,840 <1.0 <1.0
4th Qtr 10/11/2017 <1.0 --·-·-129 <1.0 <1.0
1stQtr 3/12120i'B 1.36 2,640 <1.0 <fO
2nd Qtr 6/812018 3.45 2,980 <1.0 <1.0
3rdQtr 8/30/2018 2.03 1,910 <1.0 <1.0
4th Qtr 11/28/2018 6.18 5,270 <1.0 <1.0
1st Qtr 3/8/2019 2.43 2,050 <1.0 <1.0
2nd Otr 6/5/2019 15.9 11,500 <1.0 <1.0
3rdQtr 9/4/2019 10.1 6,670 <1.0 <1.0
4th Qtr 12110/2019 <1.0 551 <1.0 <1.0
1st Qtr 2119/2020 13.7 8,720 5.41 <1.0
2nd Qtr 5/27/2020 10.4 7,600 <1.0 <1.0
3rd Qtr 9/4/2020 1.98 1,350 <1.0 <1.0
4th Qtr 10/28/2020 1.1 660 <1.0 <1.0
1statr 2123/2021 8.4 6,660 5.41 <1.0
2nd Qtr 619/2021 <1.0 775 <1.0 <1.0
3rdQtr 8/24/2021 7.83 4,450 1.98
4th Qtr 1211/2021 13.2 6,950 <1.0 <1.0 1s1··au 3/9/2022 <1.0 654 <1.0 <1.0
2nd Qtr 618/2022 2.7 2,540 4 <1.0
3rd Qtr 8/30/2022 2.5 4.750 <1.0
4th0tr 11/30/2022 8.0 7,380_ <1.0 <1.0
1stQtr 3nl2023 <1.0 230 <1.0 <1.0
2nd Otr 6/13/2023 3.1 4 850 3.4 <1.0
(1) voes were resampled because laboratory missed holding time.
(2) As of March 2012 both north and south wild life ponds no klnger receiving water. ______ _
NA= not analyzed
Bold and italics indicates the MDL exceeded the GWQS.
Shaded indicates concentrations exceedini:a GWOS.
NA 5.3
NA 5.7
NA 4.6
81 <0.1
86 4
116 5.2
123 4.3
134 4.6
133 4
129 4.1
132 4
131 2.2
128 2.8
11 3 35.2
124 47.8
127 3.2
132 2.4
43 <0.1
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 -,49 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 0.233
197 6.58
160 8.96
153 0.33
147 0.535
205 10.1
147 1.14
188 11.6
104 1.1
167 6.6
115 4.04
1.25 172 6.68
184 11.0
119 1.7
128 1.4
<1.0 178 4.76
129 3.6
122 1.75
167 6.7
TABLE 1 (21 of 33)
Historic Summary Of Monitoring Well Analytical Results Up To The 2nd Quarter 2023
Chlorofonn Contamination Investigation
DUSA White Mesa Mill
TW4-20 Parameter
(chlorofoon pumping well started (GWQS)
814/05)
Sampling Event Carbon Tetrachloride Chlorofonn Chloromethane Methylene Chloride
15 ua/L) (70 ua/L) (30 uQ/LI 15 uo/LI
1stQtr 3/16/2005 Monitor well was not installed
2nd Qtr (31 5/25/2005 NA 39,000 NA NA
3n:t at,----8/3112005 <10 ----faoo <10 ______ <10 ----
4th Qtr 1217/2005 <250 19,000 <250 <250
1S10tr 3/9/2006 <500 9,200 <500 <500
2nd Qtr 6/14/2006 <500 61,000 <500 <500
3n:1 Qtr 7/20/2006 <1000 5,300 <1000 <1000
4th Qtr 11/8/2006 7.1 11,000 1.9 2.2
1st atr 2/28/2007 3.1 4,400 <1.0 1.1
2nd Otr 6/27/2007 2.2 1,800 <1.0 <1.0
3n:1 Qtr 8/15/2007 3.5 5,200 <1.0 1.8
4th Qtr 10/10/2007 _M 9,000 <1.0 1.9
1S1Qtr 3/28/2008 9 13,000 <1.0 1.5
2nd Qtr 6/25/2008 13 30,000 <1.0 1.2
3rd Otr 9/10/2008 15 21,000 <1.0 3.7
4th Qtr 10/15/2008 NA NA NA NA
1st Qtr 3/4/2009 5.7 8,200 <1.0 5.2
2nd Qtr 6/23/2009 4.9 6,800 <1.0 4.2
3n:t atr 9/14/2009 8.4 13,000 <1"."if 4.4
4th Qtr 12/22/2009 14 15,000 <1.0 3.0
1st Qtr 2/17/2010 2.7 3,500 <1.0 3.2
2nd Qtr 6/14/2010 11 18,000 <1.0 3.7
3n:1Qtr 8/16/2010 12 15,000 <1.0 ,_ 2.2
4thQtr 10/15/2010 20 24,000 <1.0 5.5
1st Qtr 2/17/2011 27 31,000 <1.0 ,-19.0
2nd Qtr 6nt2011 10 8,100 <1.0 2.1
3rd Qtr 8/17/2011 7.3 3,800 <1.0 3.1
4th Otr 11/16/2011 7.2 7,900 <1.0 2.5
1sCQiT(21 1123/2012 --To 11,000 <1.0 1.3
2nd Qtr 6/6/2012 -------33 ---36:cioo <T O ______
<1.0
3n:1 Qtr 9/4/2012 26 13,000 <1.0 <1.0
4thQtr 10/3/2012 ______n 19.000 <1.0 <1.0
1st Ctr 2/11/2013 19.6 18,500 <1.0 1.21
2nd Ctr 6/5/2013 32.5 26,300 <1.0 1.3
3n:1Qtr 9/3/2013 25.7 26,800 <1.0 2.14
4thQtr 10/29/2013 ........... .!U 15 700 <1.0 1.37
1st Ctr 1/27/2014 18.4 17,800 <1.0 2.04
2nd Ctr 5/19/2014 22.1 22,100 2.31 3.98
3n:1 Qtr 8/11/2014 14.1 12,400 55.2 2.2
4th Ctr 10/21/2014 18.5 23,300 4.04 2.38
1st Ctr 3/9/2015 --20:S 19,900 4.85 1.38
2nd Ctr 6/8/2015 16.2 17.600 13.4 1.73
3n:1Qtr 8/31/2015 15.1 17.000 12.3 <1.0
4thQtr 10/19/2015 14.5 17,000 10.8 1
1st ctr 3/9/2016 20.2 21,600 4.6°9 1.16
2nd Qtr 5/23/2016 40.6 33.700 <1.0 <1.0
3rd Otr 7/25/2016 26.6 23,600 <1.0 <1.0
4thQtr 10/12/2016 24.4 21,300 <1.0 <1.0
1's10tr 3/8/2017 :23.5 23,400 <1.0 ·~=-1~0
2nd Ctr 6/13/2017 23.4 18.100 <1.0 <1.0
3n:1Qtr 7/26/2017 25.0 27.600 1.25 <1.0
4thQtr 10/12/2017 11.2 11,600 2.34 <1.0
1st0tr 3/12/2018 ~ 15,400 1.77 2.36
2nd Qtr 6/14/2018 <1.0 12,000 <1.0 7.77
3n:1 Qtr 8/22/2018 9.85 10,500 4.98 <1.0
4th Qtr 11/28/2018 8.32 9.500 15.6 <1.0
1st0tr 3/8/2019 15.4 15.600 <1.0 <1.0
2nd Qtr 6/5/2019 10.1 13,700 <1.0 <1.0
3n:1 Qtr 9/4/2019 8.39 10,500 <1.0 <1.0
4th Qtr 12/10/2019 5.92 8,790 2.67 <1.0
1stQtr 2/19/2020 ... 8.6 14,300 . 10.7 <1.0
2nd Ctr 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 holdmg time. (2) As of March 2012 both north and south wild life ponds no k>nger receiving water.
(3) Chloroform P'I?~ well started 814105
NA = not analyzed
Bold and italics indicates the MDL exceeded the GWQS.
Shaded indicates concentrations exceedini:i GWQS,
Chloride
No GWQS (mg/LI
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
3.01
Nitrate, Nitrate + Nitrite
(1 0mn/LI
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
9.76
10.8
8.91
9.5
10.40
8.14
9.72
6.7
9.59
10.20
9.75
9.81
7.23
TABLE 1 (22 of 33)
Historic Summary Of Monitoring Well Analytical Results Up To The 2nd Quarter 2023
Chlorofonn Contamination Investigation
OUSA White Mesa Mill
TW4-21 Parameter
(GWQS)
(chloroform pumping well 6/9/15)
Sampling Event Carbon Tetrachloride Chloroform Chloromethane Methylene Chloride
15 ua/Ll 170 ua/L) 130 ug/L) (5 ug/Ll
1statr 3/16/2005 Monitor well was not installed
2nd Qtr 5/25/2005 NA -192 NA NA
3nlQtr 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 Otr 6/14/2006 <2.5 120 <2.5 <2.5
3nlQtr 7/20/2006 <2.5 108 <2.5 <2.5
4th Qtr 11/8/2006 2 139 <1.0 <1.0
1statr 2/28/2007 1.8 160 <1.0 <1.0
2nd Ctr 6/27/2007 5.8 300 <1.0 <1.0
3nlQtr 8/15/2007 <1.0 140 <1.0 <1.0
4th Qtr 10/10/2007 <1.0 120 <1.0 <1.0
1st0tr 3/28/2008 7 390 <1.0 <1.0
2ndQtr 6/25/2008 1.7 180 <1.0 <1.0
3nlQtr 9/10/2008 '1.6 120 <1.0 <1.0
4th Qtr 10/15/2008 NA #NIA NA NA
11/18/2008 2 170 <2.0 <2.0
1stQtr 3/11/2009 <1.0 180 <1.0 <1.0
2nd Otr 6/23/2009 <1.0 200 <1.0 <1.0
3nl Qtr 9/14/2009 <1.0 200 <1.0 <1.0
4th Qtr 12/22/2009 <1.0 160 <1.0 <1.0
1st Otr 2/25/2010 <1.0 170 <1.0 <1.0
2nd Olr 6/14/2010 <1.0 210 <1.0 <1.0
3rd Qtr 8/13/2010 9.2 390 <1.0 <1.0
4th Qtr 10/15/2010 1.2 200 <1.0 <1.0
1stOtr 2/22/2011 1.2 230 <1.0 <1.0
2nd Qtr 6/28/2011 4.8 290 <1.0 <1.0
3nl Qtr 8/17/2011 6.3 460 <1.0 <1.0
4th Qlr 11/16/2011
(1) 12/7/2011 6.7 390 <1.0 <1.0 wotrr,~ _ 112312012 -~ 420 <1.0 <1.0
2nd Qtr 6/6/2012 5.4 ----4 00 <1.0 ______ <1.0------
3rdQlr 9/4/2012 6 410 <1.0 <1.0
4thOtr 10/3/2012 -~-_]_ 390 <1.0 <1.0
1st Otr 2/11/2013 5.25 282 <1.0 <1.0
2nd Qtr 6/5/2013 3.49 328 <1.0 <1.0
3rd Qtr 9/3/2013 2.13 244 <1.0 <1.0
4th Qtr 10/29/2013 <1.0 204 <1.0 ~-:..0
·1st-Otr 1/27/2014 6.23 220 <1.0 2.04
2nd Qtr 5/19/2014 4.73 240 <1.0 2.04
3nl Qtr 8/11/2014 <1.0 204 <1 .0 <1.0
4thQtr 10/21/2014 1.04 229 <1.0 <1.0
1st Otr 3/9/2015 1.75 292 <1.0 <1.0
2nd Qtr (3) 6/8/2015 1.92 366 <1.0 <1.0 3nl Qtr ____ 8/31/2015 <1.0 ----281 <1.0 ______ <1.0 ----
4thQtr 10/19/2015 <1.0 339 <1.0 <1.0
1st Qtr 3/9/2016 <1.0 390 <1.0 <1.0
2nd Otr 5/23/2016 <1.0 545 <1 .0 <1.0
3rd Otr 7/25/2016 <1.0 456 <1.0 <1.0
4thQtr 10/12/2016 <1.0 456 <1.0 <1.0
1st atr 3/8/2017 2.36 598 <1.0 <1.0
2nd Otr 6/13/2017 1.16 224 <1.0 <1.0
3rd Qtr 7/26/2017 1.05 537 <1.0 <1.0
4thQtr 10/11/2017 <1.0 466 <1.0 <1.0
OWMRCslllit ........ ...i... <3.6 400 <6.0 14 J
1st Qtr 3/12/2018 2.36 421 <1.0 <1.0
2nd Qtr 6/8/2018 <1.0 532 <1.0 <1.0
3rd Ctr 8/22/2018 <1.0 476 <1.0 <1.0
4th Qtr 10/22/2018 <1.0 585 <1.0 <1.0
,s1·a1r 3/8/2019 <1.0 323 <1.0 <1.0
2nd Qtr 6/5/2019 <1.0 734 <1 .0 <1.0
3nl Qtr 9/4/2019 <1.0 596 <1.0 <1.0
4th Qtr 12/10/2019 <1.0 794 <1.0 <1.0
1stQtr 2/19/2020 <1.0 844 2.58 <1.0
2nd Qtr 5/27/2020 <1.0 767 <1.0 <1.0
3nlQtr 9/4/2020 <1.0 920 <1.0 <1.0
4th Qtr 10/28/2020 <1.0 948 <1.0 <1.0
tstatr 2/23/2021 <1.0 400 <1.0 <1.0
2nd Otr 6/9/2021 <1.0 1,130 <1.0 <1.0
3rd Qtr 8/24/2021 <1.0 669 <1.0 <1.0
4th Qtr 12/1/2021 <1.0 649 <1.0 <1.0
1st Otr 3/9/2022 <1.0 469 <1.0 <1.0
2nd Qtr 6/8/2022 <1.0 657 <1.0 <1.0
3rdOtr 8/30/2022 <1.0 1,070 <1.0 <1.0
4th Qtr 11/30/2022 <1.0 482 <1.0 <1.0
tstQtr 3nt2023 <1.0 469 <1.0 <1.0
2nd Otr 6/13/2023 <1.0 657 1.4 <1.0
(1) VOCs were resampled because laboratory missed holding time.
(2) As of March 2012 both north and south wlld life ponds no longer recelYlng water.
(3)ChlorofOl'm pumping well startedsi§ii;-------------------------
-NA;-~t a'nalvzed
Shaded indicates concentrations exceedini:1 GWCS.
J :a: Approx:imated value
Chloride
No GWQS lma/L)
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
--------22~ 285
142
270
221
243
207
206
200
243
230
252
255
--------49~ 499
413
452
425
457
439
452
309
447
378
310
447
387
182
392
180
456
478
339
446
353
382
411
454
461
375
227 110·
331
425
158
335
397
Nitrate, Nitrate + Nitrite
I10mg/L)
14.6
10.1
9.6
8.5
10.2
8.9
8.7
8.7
8.6
8.6
8.3
14.3
8.8
7.57
8.0
#N/A 8.3
8.1
9.2
8.4
8.4
12.0
14.0
7.0
9.0
12.0
14.0
13.0
-----------15.0 11.0
13.0
14.0
11.8
13.8
10.3
9.0
11.4
11.5
7.1
10.0
10.9
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 ---1s:20
21.5
12.9
17.2
2.2
8.9
14.3
2.12
10.9
17.3
TABLE 1 (23 of 33)
Historic Summary Of Monitoring Well Analytical Results Up To The 2nd Quarter 2023
Chloroform Contamination Investigation
DUSA White Mesa Mill
TW4-22 Parameter
{nitrate pumping weM started (GWQS)
1/26113)
Sampling Event Carbon Tetrachloride Chloroform Chloromethane Methylene Chloride
(5 uo/Ll (70 ua/Ll 130 ua/Ll 15 ua/L)
1st Qtr 3/16/2005 Monitor well was not installed
2nd Qtr 5/25/2005 NA 340 NA NA
3rdQtr 8/31/2005 <5.0 290 <5.0 <5.0
4th Qtr 12/7/2005 <5.0 320 <5.0 <5.0
1st Qtr 3/9/2006 <10 390 <10 <10
2nd Otr 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
1st Ctr 2/2812007 <1.0 440 <1.0 <1.0
2nd Qtr 6/27/2007 <1.0 740 <1.0 <1.0
3rd Qtr 8/15/2007 <1.0 530 <1.0 <1.0
4th Qtr 10/10/2007 <1.0 440 <1.0 <1.0
1st Ctr 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
1st Ctr 3/11/2009 <1.0 390 <1.0 <1.0
2nd Qtr 6/23/2009 <1.0 730 <1.0 <1.0
3rdQtr 9/14/2009 <1.0 2,300 <1.0 <1.0
4th Qtr 12/29/2009 <1.0 380 <1.0 <1.0
1stQtr 3/23/2010 <1.0 2,200 <1.0 <1.0
2nd Qtr 6/14/2010 <1.0 540 <1.0 <1.0
3rd Qtr 8/24/2010 <1.0 340 <1.0 <1.0
4th Qtr 10/15/2010 <1.0 340 <1.0 <1.0
1stQtr 2/22/2011 1.2 1,300 <1.0 <1.0
2nd Otr 6/1/2011 <1.0 210 <1.0 <1.0
3rd Qtr 8/17/2011 <1.0 450 <1.0 <1.0
4th Qtr 11/16/2011 NA #NIA NA NA
w-----12/712011 <1.0 400 <1.0 <1.0
lsl"Olr( flr972lff2 .<1.0 200 <1.0 <1.0
2nd Qtr 6/13/2012 <1.0 ----1 20 <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
1st Qtr (3) 2/11/2013 3.24 ---10]00 <T O ______ <1.0
2nd Qtr 6/5/2013 3.35 12,500 <1.0 <1.0
3rd Qtr 9/3/2013 3.25 9,640 <1.0 <1.0
4th Qtr 10/29/2013 8.09 13,300 <1.0 <1.0
1stO1r 1/27/2014 6.06 12,100 <1.0 2.83
2nd Otr 5/19/2014 6.65 12,400 <1.0 <1.0
3rd Qtr 8/11/2014 1.9 12,400 40 <1.0
4th Cir 10/29/2014 3.32 12,400 1.61 <1.0
1st Qtr 3/9/2015 3.77 12,700 4.31 <1.0
2nd Qtr 6/8/2015 2.42 8,050 3.42 <1.0
3rd Qtr 8/31/2015 <1.0 7,810 5.47 <1.0
4th Qtr 10/19/2015 3.32 7,530 5.1 <1.0
1stQtr 3/9/2016 <1.0 6,070 <1.0 <1.0
2nd Otr 5/23/2016 2.64 8,570 <1.0 <1.0
3rd Qtr 7/25/2016 <1.0 5,840 <1.0 <1.0
4th Qtr 10/12/2016 1.08 3,370 <1.0 <1.0
1statr 3/8/2017 1.56 5,320 <1.0 <1.0
2nd atr 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
DWMRC &Dlitsamole <38 4,100 <60 150 J
1stQtr 3/1212018 <1.0 4,530 <1.0 <1.0
2nd Qtr 618/2018 <1.0 3,010 <1.0 <1.0
3rd Qtr 8/22/2018 <1.0 3,600 <1.0 <1.0
4th Qlr 11/28/2018 <1.0 2,680 <1.0 <1.0
1stQtr 3/8/2019 1.02 4,310 <1.0 <1.0
2nd Otr 6/5/2019 1.13 4,690 <1 .0 <1.0
3rd Qtr 9/4/2019 <1.0 3,460 <1.0 <1.0
4th Qlr 12/10/2019 <1.0 3,820 <1.0 <1.0
1stQtr 2/19/2020 1.02 3,910 <1.0 <1.0
2nd atr 5/27/2020 <1.0 2,530 <1.0 <1.0
3rd Qtr 9/4/2020 <1.0 3,760 <1.0 <1.0
4th Qtr 10/28/2020 6.83 3,640 <1.0 <1.0
isia tr 2/23/2021 <1.0 5,100 <1 .0 <1.0
2nd Qtr 6/9/2021 <1.0 4,520 <1.0 <1.0
3rd Qtr 8/24/2021 <1.0 3,510 <1.0 <1.0
4th Qtr 12/1/2021 <1.0 3,330 <1.0 <1.0
1stQtr 3/9/2022 <1.·o 3,320 <·1.0 <1.0
2nd Qtr 6/8/2022 <1.0 2,600 4.4 <1.0
3rdQtr 8/30/2022 <1.0 3,190 <1.0 <1.0
4th Qtr 11/30/2022 <1.0 2,350 <1.0 1.6
1stQtr 3/7/2023 <1.0 1,900 <1.0 1.3
2nd Qtr 6/13/2023 <1.0 2 180 3.3 2.1
(1) voes WMe r9$8mpled because laboratory rrassed holding time.
(2) As of March 2012 both north and south wild life ponds no longer recetving water.
(3) Chloroform pum!!"i, well started 1/26113 -------·
NA::notanatvzed
Shaded indicates concentrallons exceedinQ GWQS.
Bold and italics indicates the MDL exceeded the GWQS.
J "' Apofoximated value
Chloride
No GWQS lma/Ll
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
_________ 13q
130
586
487
501
598
614
540
596
675
390
557
567
583
598
619
588
566
572
391
600
610
807
580
613
567
528
662
588
608
606
578
514
523
618
408
410
586
442
564
637
601
562
596
Nitrate, Nitrate + Nitrite
(10 mg/L)
18.2
15.7
15.1
15.
14.
14.
-1i:
19.3
19.3
18.8
39.1
41.!
38.
36.3
#NIA
20.7
20.6
40.3
17.8
36:S
19.0
15.0
16.0 -···--·-fso
17.0
15.0
19.0
#NIA
14.0
12.8 7,0 ___________ 14.0
58.0
50.2
29.7
45.2 ~
47.2
41.5
54.9
69.2
47.1
64.7
56.1
31.1
58.4
61.3
61.5
698
70.8
66.1
80.1
79.0
623
72.5
55.4
75.7 --71.9
83.9
72.5
59. -----57.
60.
64.
64.
69.
89.
35.
--··-····68. 40.4
45.(
69.!
62.C
49.1 40 I
TW4-23
Sampling Event
TABLE 1 (24 of 33)
Historic Summary Of Monitoring Well Analytical Results Up To The 2nd Quarter 2023
Chloroform Contamination Investigation
DUSA White Mesa Mill
Parameter
IGWQSI
Carbon Tetrachloride Chloroform Chloromethane Methylene Chloride Chloride Nitrate, Nitrate + Nitrite
15 ua/LI 170 ua/L) 130 ua/LI
[2nd Qtr 6/27/2007 <1.0 <1.0 <1.0
[3rd Qtr 8/15/2007 <1.0 <1.0 <1.0
.d.thQtr 10/10/2007 <1.0 <1.0 <1.0
St Qlr 3/28/2008 <1.0 <1.0 <1.0
[2nd Qtr 6/25/2008 <1.0 <1.0 <1.0
[3rdQtr 9/10/2008 <1.0 <1.0 <1.0
[4th Qtr 10/15/2008 NA NA NA
11/18/2008 <2.0 <2.0 ::?.O
1stQtr 3/4/2009 -<1.o <1.0 <1.0
2nd Qtr 6123/2009 <1.0 <1.0 <1.0
3rd Qtr 9/14/2009 <1.0 <1.0 <1.0
"" 12/16/2009 <1.0 <1.0 <1.0
Cltr 3124/2010 <1.0 <1.0 <1.0
Qtr 6/14/2010 <1.0 <1.0 <1.0
Qtr 8124/2010 <1.0 <1.0 <1,0
Otr 10/15/2010 <1.0 <1.0 <1.0
Qtr 2/16/2011 <1.0 <1.0 <1.0
Otr 6/14/2011 <1.0 <1.0 <1.0
Qtr 8/16/2011 <1.0 <1.0 <1.0
Qtr 11/15/2011 <1.0 <1.0 <1.0
. -.tr 11 I 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
1st Qtr 2/7/201 3 <1.0 <1.0 <1.0
2ndQtr 5/3012013 <1.0 <1.0 <1.0
!!~~:: 9/5/2013 <1.0 <1.0 <1.0
1117/2013 <1.0 <1.0 <1.0
~~~Qtr 1/23/201 4 <1.0 <1.0 <1.0
Qtr 5/19/2014 <1.0 <1.0 <1.0
3rd0tr 8/13/2014 <1.0 <1.0 <1.0
4th Otr 10/28/2014 <1.0 <1.0 <1.0
1st Ctr 3/12/2015 <1.0 <1.0 <1.0
2nd Otr 6/8/2015 <1.0 <1.0 <1.0
3rdQtr 9/3/2015 <1.0 <1.0 <1.0
4th Qtr 10/28/2015 <1.0 <1.0 <1.0
Ducbcate TW4-70 <1.0 <1.0 <1.0
r •tOtr 3/16/2016 <1.0 <1.0 <1.0
2nd Qtr 5/26/2016 <1.0 <1.0 <1.0
3rdQtr 8/23/2016 <1.0 <1.0 <1.0
Duplicate TW4-70 <1.0 <1.0 <1.0
14th Qtr 10/12/2016 <1.0 <1.0 <1.0
l1stQtr 3/1512017 <1.0 <1.0 <1.0
Duplicate TW4-70 <1.0 <1.0 <1.0
12nd Otr 6/15/2017 <1.0 <1.0 <1.0
3rd Qtr 812/2017 <1.0 <1.0 <1.0
4th Otr 10/10/2017 <1.0 <1.0 <2.0
DWMRC ~Jtsample ··--·-5:.!:0 <1.0 <2.0
1statr 3/14/2018 <1.0 <1.0 <1.0
2nd atr 6/13/2018 <1.0 <1.0 <1.0
Duplicate TW4-70 <1.0 <1.0 <1.0
3rd Otr 8/30/2018 <1.0 <1.0 <1.0
4thQtr 12/12/2018 <1.0 <1.0 <1.0
~;st·o1r 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
4th Qtr 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
3rd Qtr 9/17/2020 <1.0 <1.0 <1.0
4th Qtr 11/4/2020 <1 .0 <1.0 <1.0
1stOtr 3/17/2021 <1.0 <1.0 <1.0
2nd Qtr 6/16/2021 <1.0 <1.0 <1.0
3rd Qtr 9/15/2021 <1.0 <1.0 <1.0
4thQtr 12/8/2021 <1.0 <1.0 <1.0
Duolic:ate TW4-70 <1.0 <1.0 <1.0
1stOtr 3/22/2022 <1.0 <1.0 <1.0
Duplicate TW4-70 <1.0 <1.0 <1.0
2nd Qtr 6/16/2022 <1.0 <1.0 <1.0
3rd Qtr 9/14/2022 <1.0 <1.0 <1.0
4th Qtr 12/7/2022 <1.0 <1.0 <1.0
1stQtr 3/29/2023 <1.0 <1.0 <1.0
2nd atr 6/20/2023 <1.0 <1.0 <1.0
(1) As of March 2012 both north and south wild llfe ponds no longer receIvIng watff.
NA= not analyzed
Shaded indicates concentrations exceedini::i GWOS.
J = Approximated value.
15 ua/LI No GWQS (mg/L) 110mn/LI
<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 l4 <0.1
<1.0 44 <0.1
<1.0 44 <0.1
<1.0 41 <0.1
<1.0 43 <0.1 <1.o 40 <0.1
<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 <ro 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
<1.0 42.2 0.10
<1.0 45.0 <0.1
<1.0 47.5 <0.1
<1.0 50.2 <0.1
<1.0 51.3 <0.1
TABLE 1 (25 of 33)
Historic Summary Of Monitoring Well Analytical Results Up To The 2nd Quarter 2023
Chloroform Contamination Investigation
OUSA White Mesa Mill
TW4-24
(nitrate pumping well started
1/26113)
Sampling Event Carbon Tetrachloride Chloroform Chloromethane
15 ua/Ll 170 uo/L) (30 µg/L)
2ndQtr 6/27/2007 <1.0 2.6 <1.0
3rnQtr 8/15/2007 <1.0 2.2 <1.0
4th Qtr 10/10/2007 <1.0 1.5 <1.0
1statr 3/28/2008 <1.0 1.5 <1.0
2nd Qtr 6/25/2008 <1.0 1.4 <1.0
3rnQtr 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
2nd Qtr 6/23/2009 <1.0 1.5 <1.0
3rnQtr 9/14/2009 <1.0 1.4 <1.0
4th Ctr 12/16/2009 <1.0 1.2 <1.0
1stQtr 3/25/2010 <1.0 1.3 <1.0
2nd Qtr 6/14/2010 <1.0 1.7 <1,0
3rn Q1r 8/24/2010 <1.0 1.8 <1.0
4thQtr 10/15/2010 <1.0 1.4 <1.0
1st Ctr 2/16/2011 <1.0 1.8 <1.0
2nd Qtr 6/14/2011 <1.0 1.1 <1.0
3rn Qtr 8/16/2011 <1.0 1.7 <1.0
4th Qtr 11/15/2011 NA #NIA NA
11) 12/7/2011 <1.0 1.2 <1.0
11st atr IZJ 1/16/2012 <1.0 <1.0 <1.0
2nd Qtr 6/6/2012 <1.0 <1 .0 ____ <1.0 ______
3fl1Qtr 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 -------, <T O ______
2nd Qtr 6/5/2013 <1.0 17.4 <1.0
3rn Qtr 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
3fl1Qtr 8/11/2014 <1.0 76.3 <1.0
4thQtr 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
3fl1Qtr 8/31/2015 <1.0 46.9 <1.0
4th Qtr 10/19/2015 <1.0 25.3 <1.0
1st Qtr · 3/9/2016 <1.0 22.8 <1.0
2nd Qtr 5/23/2016 <1.0 69.6 <1.0
3fl1Qtr 7/25/2016 <1.0 17.8 <1.0
4thQtr 10/12/2016 <1.0 20.8 <1.0
1st Qtr 3/8/2017 <1.0 18.3 <1.0
2nd atr 6/13/2017 <1.0 17.2 <1.0
3rdQtr 7/26/2017 <1.0 17.8 <1.0
4th Qtr 10/11/2017 <1.0 16.0 <1.0
OWMR~£!!!"-""'ni.. <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
OWMRCsolit"""'...i... <5.0 60 <5.0
1stQtr 3/8/2019 <1.0 28.1 <1.0
2nd Qtr 6/512019 <1.0 28.8 <1.0
3rd Qtr 9/4/2019 <1.0 31.1 <1.0
4thQtr 12/10/2019 <1.0 43.3 <1.0
1st Qtr 2/19/2020 <1.0 61 .7 <1.0
2nd Qtr 5/27/2020 <1.0 49.4 <1.0
3rnQtr 9/4/2020 <1 .0 ~38 <1.0
4th Qlr 10/28/2020 <1.0 72.6 <1.0
~·s1O1r 2/23/2021 <1.0 96.-2 3.6
2nd Qtr 6/9/2021 <1.0 41.9 <1.0
3fl1Qtr 8/26/2021 <1.0 103 <1.0
4thQtr 12/1/2021 <1.0 112 <1.0
1stQtr 3/9/2022 <1.0 114 <1.0
2nd Otr 6/8/2022 <1.0 124 <1.0
3fl1Qtr 8/30/2022 <1.0 88.9 <1.0
4th Qtr 11/30/2022 <1.0 79.5 <1.0
1St-Otr 3n/2023 <1.0 99.5 <1.0
2nd Qtr 6/13/2023 <1.0 58.3 <1.0
(1) voes were resampled because laboratory m,ssed holding bmo.
(2) As of March 2012 both north and south wild life ponds no longer receiving water.
(3)Chloroform~wellstarted1f26/13 -------·
NA: not analyzed
Shaded indicates concentrations exceeding GWCS.
J :: ApproX1mated value
Parameter
(GWQS)
Methylene Chloride
15 ug/L)
<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·.o
<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
<1.0
<1.0
<1.0
<1.0
<1.0
Chloride
No GWQS lmg/L)
770
791
692
740
834
1,180
1,130
#N/A
1,010
759
618
1,080
896
639
587
522
1,100
1,110
967
608
#NIA
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
1,100
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
1,140
980
944
868
972
932
866
Nitrate, Nitrate + Nitrite
110ma/L)
26.1
29
24.7
24.4
45.3
38.4
44.8
#NIA
30.5
30.4
30.7
28.3
33.1
30
31
31
31
35
34
35
#NIA
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
--~2.0
44.9
33.6
33.8
38.4
34.0
39.3
33.2
36.4
33.8
37.1
41.7
39.1
35.9 419
48.0
26.7
43.6
36.2
35.0
32.0
27.6 --··· 36.2
35.9
TABLE 1 (26 of 33)
Historic Summary Of Monitoring Well Analytical Results Up To The 2nd Quarter 2023
Chlorofonn Contamination Investigation
OUSA White Mesa MIU
I TW4-25 Parameter
(nitrate pumping well started (GWQS)
1/26113) Sampling Event Carbon Tetrachloride Chlorofonn Chloromethane Methylene Chloride Chloride
15 ua/L) 170 un/L) (30 un/L) 15 un/Ll No GWQS (ma/L)
2ndQtr 6/27/2007 <1.0 <1.0 <1.0 <1.0 395
3rdQtr 6/15/2007 <1.0 2.2 <1.0 <1.0 362
4th Qt/ 10/10/2007 <1.0 <1.0 <1.0 <1.0 356
1stQtr 3/26/2006 <1.0 <1.0 <1.0 <1.0 374
2ndQtr 6/25/2006 <1.0 <1.0 <1.0 <1.0 344
3rdQtr 9/10/2006 <1.0 <1.0 <1.0 <1.0 333
4th Qtr 10/15/2006 NA #NIA NA NA 366
11/16/2006 <2.0 <2.0 <2.0 <2.0 #NIA
1st Qtr 3/4/2009 <1.0 <1.0 <1.0 <1.0 3
2nd0tr 6/23/2009 <1.0 . -----<1.0 --~ ---~1.0 -·····-326
3rdQtr 9/14/2009 <1:0 <1.0 <1.0 <1.0 326
4thQtr 12/16/2009 <1.0 <1.0 <1.0 <1.0 371
1st Qtr 3/23/2010 <1.0 <1.0 <1.0 <1.0 296
2nd Qtr 6/14/2010 <1.0 <1.0 <1.0 <1.0 306
3rd Qtr 6/10/2010 <1 .0 <1.0 <1.0 <1.0 250
4th Qtr 10/15/2010 <1.0 <1.0 <1.0 <1.0 312
1st0tr 2/16/2011 <1.0 1.8 <1.0 <1.0 315
2nd Qtr 5/25/2011 <1.0 <1.0 <1.0 <1.0 321
3rd Qtr 6/16/201 1 <1.0 <1.0 <1.0 <1.0 276
4th Qtr 11/15/2011 <1.0 <1.0 <1.0 <1.0 294
Tst0tr(2~ --1/16/2012 <1 .0 _________ <1.0 <1.0 <1.0 304
2nd Otr 5/31/2012 <1.0
<1.0 ____ <TO ______ <1.0 267
3rd Otr 9/4/2012 <1.0 <1.0 <1.0 <1.0 334
4th Qtr 10/3/2012 <1.0 <1.0 <1.0 <1.0 --------336 1st Qtr (3) 2/11/2013 <1.0 <1.0 ----<TO ______ <1.0 ----190
2nd Qtr 6/5/2013 <1.0 <1.0 <1.0 <1.0 136
3rd Qtr 9/4/2013 <1.0 <1.0 <1.0 <1.0 119
41h Qtr 10/31/2013 <1.0 <1.0 <1.0 <1.0 66.6
1st Qtr 1/27/2014 <1.0 <1.0 <1.0 <1.0 65.7
2nd Qtr 5/19/2014 <1.0 <1.0 <1.0 <1.0 51.1
3rd Qtr 6/11/2014 <1.0 <1.0 <1.0 <1.0 67
4th Qtr 10/21/2014 <1.0 <1.0 <1.0 <1.0 56.1
1stQtr 3/9/2015 <1.0 <1.0 <1.0 <1.0 310
2nd Qtr 6/6/2015 <1.0 <1.0 <1.0 <1.0 56.3
3rd Qtr 6/31/2015 <1.0 <1.0 <1.0 <1.0 69.2
4th Qtr 10/19/2015 <1.0 <1.0 <1.0 <1.0 93.7
1st Otr 3/9/2016 <1.0 <1.0 <1.0 <f."o 62.7
2nd Qtr 5/23/2016 <1.0 <1.0 <1.0 <1.0 75.5
3rd Ctr 7/25/2016 <1.0 <1.0 <1.0 <1.0 74.1
4th Qtr 10/12/2016 <1.0 <1.0 <1.0 <1.0 59.6
1stOtr 3/6/2017 <1.0 1.15 <1.0 <1.0 265
2nd Qtr 6/13/2017 <1.0 <1.0 <1.0 <1.0 69.6
3rdQtr 7/26/2017 <1.0 <1.0 <1.0 <1.0 70.1
4th Qtr 10/11/2017 <1.0 <1.0 <1.0 <1.0 66.0
1stOtr 3/12/2016 <1.0 1.15 <1.0 <1.0 70.5
2nd Qtr 6/14/2016 <1.0 <1.0 <1.0 <1.0 60.3
3rdQtr 6/22/2016 <1.0 <1.0 <1.0 <1.0 69.1
4th atr 11/26/2016 <1.0 <:1..0 <1.0 <1.0 59.7
1"Slotr 3/6/2019 <1.0 <1.0 <1.0 <1.0 -65
2nd Qtr 6/5/2019 <1.0 <1.0 <1.0 <1.0 59
3rdQtr 9/4/2019 <1.0 <1.0 <1.0 <1.0 56.1
4th atr 12/10/2019 <1.0 <1.0 <1.0 <1.0 73.1
1stOtr 2/19/2020 <1 .0 <1.0 <1.0 <1.0 86.0
2nd Qtr 5/27/2020 <1.0 <1.0 <1.0 <1.0 76.6
3rdQtr 9/4/2020 <1.0 <1.0 <1.0 <1.0 67.3
~~...Qir 10/26/2020 <1.0 <1.0 <1.0 <1.0 61.3
1stOtr 2/23/2021 <1.0 <1.o <1.0 <1.0 100
2nd Qtr 6/9/2021 <1.0 <1.0 <1.0 <1.0 55.1
3rdQtr 6/26/2021 <1.0 <1.0 1.34 <1.0 69.3
4thQtr 12/1/2021 <1.0 <1.0 <1.0 <1.0 93.7
1st Qtr 3/9/2022 <1.0 <1.0 <1.0 <1.0 70.3
2nd Otr 6/6/2022 <1.0 <1.0 <1.0 <1.0 72.6
3rd Qtr 6/30/2022 <1.0 <1.0 <1.0 <1.0 62.5
4th Qtr 11/30/2022 <1.0 <1.0 <1.0 <1.0 87.2
1stOtr 3n12023 <1.0 <1.0 <1.0 <1.0 96.7
2nd Otr 6/13/2023 <1.0 <1.0 <1.0 <1.0 73.0
(1) voes were resamplllcl because laboratory missed hok:hng time.
(2) As of March 2012 both north and south wild life ponds no k>nger receiving water.
J?!, Chloroform _pumf!'?a, well started 1126113. _______ a
NA = not analyzed
Shaded indicates concentrations exceeding GWOS.
Nitrate, Nitrate + Nitrite
11 o ma/Ll
17.1
29
17
16.7
22.1
16.6
21.3
#N/A
15.3
15.3
3.3
14.2
14.4
16
14
15
15
16
16
16
16 --16
17
-----------17 9.04
5.24
5.69
6.1
2.16
1.21
1.6
1.03
14.4
1.14
1.63
1.76
0.637
0.959
1.76
1.24
17.0
0.976
1.23
1.29
2.23
1.14
0.610
0.634
0.639
0.621
0.546
0.641
0.607
0.651
0.994
1.64
3.43
1.57
0.793
0.976
1.6
0.66
1.51
1.47
1.96
1.03
TABLE 1 (27 of 33)
Historic Summary Of Monitoring Well Analytical Results Up To The 2nd Quarter 2023
Chloroform Contamination Investigation
OUSA White Mesa Mill
TW4-26 Parameter
Sampling Event fGWQSl
Carbon Tetrachloride Chloroform Chloromethane Methylene Chloride Chloride
(5 uo/L) 170 uo/Ll (30 un/Ll (5 ~g/L) No GWQS fmg/Ll
2nd Qtr 6/14/2010 <1.0 13 <1.0 <1 .0 33
3ruQtr 8/24/2010 <1.0 5.2 <1.0 <1 .0 17
4th Qtr 10/15/2010 <1.0 5.4 <1.0 <1 .0 22
1stQtr 2/16/2011 <1.0 2 <1.0 <1 .0 30
2nd Qtr 5/26/2011 <1 .0 2.9 <1.0 <1.0 15
3rdQtr 8/17/2011 <1.0 2.8 <1.0 <1 .0 19
4th Qtr 11/16/2011 NA #N/A NA NA 26
..... _ ... ..J1) 12/7/2011 <1 .0 5.2 <1.0 <1.0 #N/A
fst Otr J2L _ 1/18/2012 <1.0 i <1.0 <1.0 17 ----------------4-:; <1.0 ______ ---------19 2nd Ctr 6/6/2012 <1.0 <1 .0
3ruQtr 9/11/2012 <1.0 4.9 <1.0 <1 .0 19
4th Qtr 10/3/2012 <1.0 4.9 <1.0 <1 .0 19
1st0tr 2/11/2013 <1.0 4.9 <1.0 <1 .0 16.6
2nd Otr 6/13/2013 <1.0 2.12 <1.0 <1.0 14.5
3rdQlr 9/5/2013 <1.0 2.81 <1.0 <1 .0 17.6
4th Qtr 11/7/2013 <1.0 3.37 <1.0 <1.0 15.9
1stQtr 1/29/2014 <1.0 1.43 <1.0 <1.0 16.9
2nd Qtr 5/21/2014 <1.0 4.23 <1.0 <1.0 15.4
3ru Qtr 8/11/2014 <1.0 1.3 <1.0 <1 .0 15
4th Qtr 10/28/2014 <1.0 2.45 <1.0 <1 .0 14.6
1stQtr 3/12/2015 <1.0 2.37 <-1.11 <1.0 14.4
2nd Qtr 6/10/2015 <1.0 6.12 1.17 <1.0 14.4
3ruQtr 9/3/2015 <1.0 4.77 <1.0 <1.0 14
4th Qtr 10/28/2015 <1.0 3.45 <1.0 <1 .0 13.3
1stQtr 3/16/2016 <1.o 'fii <1.0 <1 .0 13.7
2nd Otr 5/26/2016 <1.0 8.23 <1.0 <1 .0 15.2
3ruQtr 8/3/2016 <1.0 4.42 <1.0 <1 .0 13.9
4th Qtr 10/20/2016 <1.0 19.9 <1.0 <1 .0 14.2
1st Otr . <1.0 3/16/2017 46.1 <1.0 <1 .0 16.2
2nd Qtr 6/20/2017 <1 .0 244 <1.0 <1.0 19
3rdQtr 8/3/2017 <1 .0 419 <1.0 <1 .0 25.8
4th Qtr 10/11/2017 <1.0 608 <1.0 <1 .0 27.3
1sl Otr 3/21/2018 <1 .0 1,050 <1.0 <1.0 35.5
2nd Otr 6/14/2018 <1.0 960 <1.0 <1 .0 33.5
3ruQtr 9/6/2018 <1.0 916 <1.0 <1.0 38.9
4thQtr 12/13/2018 <1.0 1,050 <1.0 <1 .0 33.4
1stOtr 3/20/2019 <1.0 963 <1.0 <1 .0 32.9
2nd Qtr 6/5/2019 <1.0 1,070 <1.0 <1 .0 35.8
3rd Otr 9/12/2019 <1.0 877 <1.0 <1.0 32.0
4th Qtr 12/18/2019 <1.0 1.070 <1.0 <1 .0 38.3
1st Qtr 3/18/2020 <1.0 1,090 <1.0 '<1.0 36.3
2nd Otr 6/12/2020 <1.0 1.140 <1.0 <1 .0 35.1
3ruQtr 9/19/2020 <1.0 1120 <1.0 <1 .0 34.8
4th Qtr 11/11/2020 <1.0 1,160 <1.0 <1 .0 36.3
1st0tr 3/24/2021 <1 .0 1,030 <1.0 <1 .0 38.9
2nd Otr 6/17/2021 <1.0 1,020 <1.0 <1 .0 34
3ruQtr 9/23/2021 <1.0 927 <1.0 <1.0 36.5
4th Otr 12/9/2021 <1.0 993 <1.0 <1 .0 34.9 isi"Otr 3/24/2022 <1 .0 952 2.4 <1.0 33.0
2nd Qtr 6/22/2022 <1 .0 790 <1.0 <1 .0 34
3rdQtr 9/15/2022 <1 .0 930 <1.0 <1 .0 36.7
4th Qtr 12/9/2022 <1.0 890 <1.0 <1 .0 32.7
1stOtr 3/29/2023 <1.0 703 <1.0 <1 .0 34.5
2ndQtr 6/21/2023 <1 .0 659 <1.0 <1.0 33.5
TW4-27
11 SI ytr !'L _ 1/18/2012 <1 .0 ---------9 <1.0 <1 .0 11
2ndOtr 6/13/2012 <1 .0 <1.0 ____ <1.0 ______
<1 .0 ------17
i~i 9/4/2012 <1 .0 <1.0 <1.0 <1.0 21
10/3/2012 <1 .0 <1.0 <1.0 <1.0 18
2/7/2013 <i'.0 <1.0 <1.0 <1.0 18.8 r
r 6/13/2013 <1 .0 <1.0 <1.0 <1 .0 20.3
3ruQtr 8/30/2013 <1.0 <1.0 <1.0 <1 .0 19
4th Qtr 11/6/2013 <1.0 <1.0 <1.0 <1 .0 21.8
1stQtr 1/23/2014 <1.0 <1.0 <1.0 <1 .0 31.8
2ndQtr 5/21/201 4 <1.0 <1.0 <1.0 <1 .0 20.6
Qtr 8/13/2014 <1.0 <1.0 <1.0 <1.0 23
Qtr 10/28/2014 <1.0 <1.0 <1.0 <1 .0 24.4
Qtr 3/11/2015 <1 .0 <1.0 <1.0 <1.0 26.2
Qtr 6/10/2015 <1 .0 <1.0 <1.0 <1 .0 26.8
Qtr 9/2/2015 <1 .0 1.3 <1.0 <1.0 26.8
Qtr 10/28/2015 <1 .0 1.6 <1.0 <1.0 26.2
Qtr 3/16/2016 <1 .0 2.11 <1.0 <1 .0 28
Qtr 5/26/2016 <1 .0 3.16 <1.0 <1.0 21.2
Qtr 8/3/2016 <1 .0 2.78 <1.0 <1.0 27.1
Qtr 10/20/2016 <1.0 . 3.8 <1.0 <1.0 29.4
Qtr 3/15/2017 <1.0 4.33 <1.0 <1.0 28.3
Qtr 6/15/2017 <1 .0 5.65 <1.0 <1.0 27.9
Qtr 8/2/2017 <1.0 6.05 <1.0 <1.0 29.5
,no, 10/10/2017 <1.0 5.91 <1.0 <1.0 26.3
Qtr 3/14/2018 -<1.o 6.95 <1.0 <1.0 30.3
Qtr 6/13/2018 <1.0 5.95 <1.0 <1 .0 28.3
Qtr 8/30/2018 <1 .0 7.35 <1.0 <1.0 31 .4
Qtr 12/12/2018 <1.0 7.7 <1.0 <1.0 28.2
st Qtr 3/16/2019 <1.0 6.54 <1.0 <1.0 26.2
2nd Qtr 6/13/2019 <1.0 8.24 <1.0 <1.0 28.6
3ruQtr 9/11/2019 <1.0 7.58 <1.0 <1.0 25.3
4thQtr 12/14/2019 <1.0 7.97 <1.0 <1.0 27.4
1st Qtr 3/18/2020 <1.0 8.04 <1.0 <1.0 27.6
2nd Qtr 6/11/2020 <1.0 7.92 <1.0 <1.0 28.0
3ruQtr 9/18/2020 <1.0 5.62 <1.0 <1.0 26.2
4thQtr 11/4/2020 <1.0 7.8 <1.0 <1.0 26.8
1st Qtr 3/18/20:ii' <1.0 4.66 <1.0 <1.0 27.5
~:atr 6/17/2021 <1.0 4.26 <1.0 <1.0 25.8
Qtr 9/15/2021 <1.0 3.81 <1.0 <1.0 21 .7
4th Qtr 12/8/2021 <1.0 4.08 <1.0 <1.0 26.4
1stQtr 3/23/2022 <1.0 3.3 <1.0 <1 .0 22.7
2nd Qtr 6/16/2022 <1.0 3.1 <1.0 <1 .0 22.3
3ruQtr 9/14/2022 <1.0 4.3 <1.0 <1 .0 23.2
12/8/2022 <1.0 2.3 <1.0 <1.0 16.2
3/29/2023 <1.0 2.·o <1.o <1.0 22.8
6/21/2023 <1.0 2.5 <1.0 <1.0 25.7
(1) voes wefe resampled because laboratory missed hok:hng time.
(2) As of March 2012 both north and south wtld life ponds no IOnger receMng water. ______ _
NA = not analyzed
Shaded indlcatn concentrabons exceeding GWQS
Nitrate, Nitrate + Nitrite
11 0 mo/L)
7.9
9.0
9.6
10.0
10.0
11 .0
10.0
#N/A
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 1 19
11.1
10.5
11.9
11.3
14.2
12.1
8.15
10.9
9.9
10.3
10.4 ---1-0.5
10.0
24.0
41 .0
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.s
22.0
18.1
20.8
21 .5
22.3
21 .2
22.0 ~
21 .5
25.2
16.7 "" ____
23.0
23.8
21 .1
24.9
21.3
20.0
16.9
18.1
20.9
16.9
TW4-28
Sampling Event
TABLE 1 (28 of 33)
Historic Summary Of Monitoring Well Analytical Results Up To The 2nd Quarter 2023
Chloroform Contamination Investigation
OUSA White Mesa Mill
Parameter
IGWQSI
Carbon Tetrachloride Chloroform Chloromethane Methylene Chloride Chloride
(5 ug/L) 170 uo/LI (30 ""/L) (5"g/L) No GWQS Ima/LI
2nd0tr 6/19/2013 <1.0 <1.0 <1.0
3rd Ctr 8/29/2013 <1.0 <1.0 <1.0
4th Qtr 11/6/2013 <1.0 <1.0 <1.0
1stQtr 1/2212014 <1.0 <1.0 <1.0
2nd Otr 5/21/2014 <1.0 <1.0 <1.0
3rdQtr 8/13/2014 <1.0 <1.0 <1.0
4th Qtr 10/23/2014 <1.0 <1.0 <1.0
1stQtr 3/11/2015 <1.0 <1.0 <LO
2nd Qtr 6/10/2015 <1.0 <1.0 <1.0
3rd Qtr 9/212015 <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
12nd Qtr 5/25/2016 <1.0 <1.0 <1.0
3rdQtr 7/27/2016 <1.0 <1.0 <1.0
Duplicate TW4-65 <1.0 <1.0 <1.0
14th Qtr 10/19/2016 <1.0 <1.0 <1.0
Dllollcate TW4-65 <1.0 <1.0 <1.0
l1st Qtr 3/14/2017 <1.0 <1.0 <1.0
Duplicate TW4-65 <1.0 <1.0 <1.0
2nd Otr 6/14/2017 <1.0 <1.0 <1.0
3rd Ctr 7/27/2017 <1.0 <1.0 <1.0
4th Otr 10/10/2017 <1.0 <1.0 <1.0
1stQtr 3/14/2018 <1.0. <1.0 <1.0
2nd Qtr 6/1212018 <1.0 <1.0 <1.0
OuplicateTW4-65 <1.0 <1.0 <1.0
3rd Qtr 8/29/2018 <1.0 <1.0 <1.0
4th Qtr 11/30/2018 <1.0 <1.0 <1.0
1st0tr 3/16/20f9 ·:.:1.0 <1.0 <1.0
2nd Otr 6/13/2019 <1.0 <1.0 <1.0
3rd atr 9/11/2019 <1.0 <1.0 <1.0
4th Qtr 1211212019 <1.0 <1.0 <1.0
1statr 3/17/2020 <1.0 <1.0 <1.0
2nd Otr 6/10/2020 <1.0 <1.0 <1.0
3rd Qtr 9/17/2020 <1.0 <1.0 <1.0
4th Otr 11/4/2020 <1.0 <1.0 <1 .0
1st air 3/17/2021 <1.0 <1.0 <1.0
2nd atr 6/15/2021 <1.0 <1.0 <1.0
3rd Qtr 9/15/2021 <1.0 <1.0 <1.0
4th Qtr 12/7/2021 <1.0 <1.0 <1.0
1stQtr 3/15/2022 <1.0 <1.0 <1.0
2nd Qtr 6/15/2022 <1.0 <1.0 <1.0
3rd Qlr 9/13/2022 <1.0 <1.0 <1.0
4th Qtr 1217/2022 <1.0 <1.0 <1.0
1stQtr 3/2212023 <1.0 <1.0 <1.0
OuplicateTW4-65 <1.0 <1.0 <1.0
2nd Otr 6/15/2023 <1.0 <1.0 <1.0
TW4-29 ·-2nd Qtr 6/19/2013 <1.0 242 <1.0
2nd Otr 7/11/2013 <1.0 262 <1.0
3rd Qtr 9/26/2013 <1.0 246 <1.0
4th Qtr 11/13/2013 <1.0 260 <1.0
1stQtr 215/2014 <1.0 258 <1.0
2nd atr 5/2212014 <1.0 262 <1.0
3rdQtr 8/27/2014 <1.0 242 <1.0
4th Qtr 10/29/2014 <1.0 290 <1.0
1st 0tr 3/1212015 <1.0 299 <1.0
2nd Qtr 6/11/2015 <1.0 329 <1.0
3rdQtr 9/3/2015 <1.0 276 <1.0
4th Qlr 10/29/2015 <1.0 631 <1.0
1st Qtr 3/17/2016 <1.0 335 <1.0
2nd Otr 6/8/2016 <1.0 366 <1.0
3rd Qtr 8/3/2016 <1.0 401 <1.0
4th Qlr 10/26/2016 <1.0 392 <1.0
1st atr 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 Qlr 10/11/2017 <1.0 431 <1.0
1st0tr 3/14/2018 <1.0 533 <1.0
2nd atr 6/14/2018 <1.0 474 <1.0
3rd Qtr 8/29/2018 <1.0 454 <1.0
4th Qlr 12113/2018 <1.0 521 <1.0
·1st Ctr 3/20/2019 <1.0 507 <1.0
2nd Otr 6/13/2019 <1.0 537 <1.0
3rd Ctr 9/1212019 <1.0 549 <1.0
4th Qtr 12118/2019 <1.0 630 <1.0
1st Qtr 3/18/2020 <1.0 652 <1.0
2nd Otr 6/1212020 <1.0 686 <1.0
3rdQtr 9/19/2020 <1.0 621 <1.0
4th Qlr 11/11/2020 <1.0 671 <1.0
OWMRC solit samDMII <10 670 <20
1st Ctr 3/24/2021 <1.0 577 <1.0
2ndQtr 6/17/2021 <1.0 543 <1.0
3rd Ctr 9/23/2021 <1.0 602 <1.0
4th Otr 1219/2021 <1.0 625 <1.0
~~teTW4-75 <1.0 636 <1.0
1statr 3/23/2022 <1.0 624 <1.0
2nd Qtr 6/2212022 <1.0 398 <1.0
3rd Qtr 9/23/2021 <1.0 591 <1.0
Duplicate TW4-75 <1.0 591 <1.0
4th Qtr 1219/2022 <1.0 588 <1.0
1st Qtr 3/29/2023 <1.0 467 <1.0
2nd Otr 6/21/2023 <1.0 490 <1.0
H = Sample was analyad beyond holding times and may not be accureate concentration.
Shaded indicates conc8f'ltrations ex~ 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 <io 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.o s21
<1.0 49.8
<1.0 47.4
<1.0 49.0
<1.0 St.8
<1.0 48.5
<1.0 40.7
<1.0 47.8
<1.0 38.8
<1.0 52.3
<1.0 58.5
<1.0 52.0
<1.0 46.1
<1.0 49.4
<1.0 SP
<1.0 44.8
<1.0 37.7
<1.0 41.4
<1.0 42.5
<1.0 1-i:ii
<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
<1.0 41.5
<1.0 41.8
<1.0 42.0
<1.0 41.3
<1.0 41.:f
<1.0 42.2
Nitrate, Nitrate + Nitrite
110 ma/LI
14.9
17.3
16.
16.
16.
14.
16.
19.
19.
17.
18.
34.
32.
29.
31.
35.
25.
25. T4:4
2H
26.(
24.E
24.f
17.2
19.0
18.7
16.0
17.7 iY
15.
10.
9.'
9.!
9
8
7.
8.
9.1
8.1
7.61
7.81
15.0
16.2
16.1 ·11.!
11.1
11.,
4;: 3.
4.
4.1
4.6:
3.5
3.4(
3.6
4.14
2.
2.
?
2.
2.
2.
2.
2.
2.
2.3
2.41
2.4
2.6
2.5,
2.51
2.6
2.51:
2.51
2.51
3.11
3.
2.
3.
0.75
3.
3.
3
2.
1.91
3.10
2.9
2.80
2.76
2.69
2.74
2.65
TW4-30
Sampling Event
TABLE 1 (29 of 33)
Historic Summary Of Monitoring Well Analytical Results Up To The 2nd Quarter 2023
Chloroform Contamination Investigation
OUSA White Mesa Mill
Parameter
4GWQSI
Carbon Tetrachloride Chloroform Chloromethane Methylene Chloride Chloride
(5 ua/L) <70 ua/L) 430 un<LI 45un/LI No GWQS <mn/LI
2nd Ctr 6/19/2013 <1 .0 <1.0 <1.0 <1.0 36
3rdOtr 9/26/2013 <1 .0 <1.0 <1.0 <1.0 36.3
4thQtr 11/13/2013 <1.0 <1.0 <1.0 <1.0 35.9
1st Ctr 1/23/2014 <1.0 <1.0 <1.0 <1.0 36.9
2nd Qtr 5/2212014 <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
1statr 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
3rd Qtr 9/3/2015 <1.0 3.27 <1.0 <1.0 44.2
4thQtr 10/28/2015 <1 .0 3.48 <1.0 <1.0 37.8
1st Qtr 3/17/2016 <1.0 5.16 <1.0 <1.0 39.6
2nd Ctr 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
4th Qtr 10/20/2016 <1 .0 8.69 <1.0 <1.0 41 .3
1stQtr 3/15/2017 <1 .0 13.6 'f1.0 <1.o 37.7
2nd Ctr 6/15/2017 <1 .0 15.2 <1.0 <1.0 37.8
3rd Otr 8/3/2017 <1.0 15.7 <1.0 <1.0 39.8
4thQtr 10/10/2017 <1.0 13.4 <1.0 <1.0 34.9
1st Qtr 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 atr 8/30/2018 <1.0 19.8 <1.0 <1.0 44.1
4thOtr 1211212018 <1 .0 23.9 <1.0 <1.0 35.5
1stQtr 3/15/2019 <1 .0 25.3 <1.0 <1.0 35.9
2ndQtr 6/13/2019 <1.0 31 .5 <1.0 <1.0 27.2
3rdQtr 9/11/2019 <1.0 34.8 <1.0 <1.0 34.5
4thQtr 12118/2019 <1.0 44.9 <1.0 <1.0 39.1
1st0tr 3/17/2020 <1.0 53.1 <1.0 <1.0 37.5
2ndatr 611212020 <1.0 65.4 <1.0 <1.0 38.6
3rd Otr 9/18/2020 <1.0 ,~ 67.7 <1.0 <1.0 35
4th Otr 11/11/2020 <1.0 ,_ 82.8 <1.0 <1.0 37.1
OWMRCs.-J;t.,.,. ............. <10 66 <20 <20 39
1stQtr 3/17/2021 <1.0 74.8 <1.0 <1.0 37.6
2ndQtr 6/17/2021 <1 .0 78.7 <1.0 <1.0 38.3
3rd Qtr 9/2212021 <1.0 78.2 <1.0 <1.0 23.5
4th Qtr 1218/2021 <1.0 81 .2 <1.0 <1.0 37.9
1stQtr 3/23/2022 <1.0 73.6 <1.0 <1.0 35.1
2nd Qtr 6/2212022 <1.0 70.8 <1.0 <1.0 41.3
3rdQtr 9/14/2022 <1.0 68.8 <1.0 <1.0 30.5
4th Qtr 1219/2022 <1.0 60.5 <1.0 <1.0 36.5
1stQtr 3/29/2023 <1.0 45.5 <1.0 <1.0 36.6
2ndQtr 6/21/2023 <1.0 47 <1.0 <1.0 36.8
TW4-31
2ndQtr 6/19/2013 <1.0 <1.0 <1.0 <1.0 28.4
3rdOtr 9/5/2013 <1.0 <1.0 <1.0 <1.0 29.4
4th Otr 11m 2013 <1.0 <1.0 <1.0 <1.0 28
1stQtr 1/23/2014 <1.0 <1.0 <1.0 <1.0 28.5
2ndQtr 5/21/2014 <1.0 <1.0 <1.0 <1.0 26.3
3rdQtr 8113/2014 <1.0 <1.0 <1.0 <1.0 30
4th Qtr 10/28/2014 <1.0 <1.0 <1.0 <1.0 37.1
1st Qtr 3/11/2015 <1.0 <1.0 <1.0 <1.0 30.6
2ndQtr 6/10/2015 <1.0 <1.0 <1.0 <1.0 31.1
3rdQtr 9/212015 <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 <fo <TO <1.0 <TO Ji°'.s
2ndQtr 5/2512016 <1.0 <1.0 <1.0 <1.0 32.5
3rdQtr 7/2812016 <1.0 <1.0 <1.0 <1.0 30.6
4th Qtr 10/20/2016 <1.0 <1.0 <1.0 <1.0 34
1stQtr 3/15/2017 <1.0 <1.0 <1.0 <1.0 31.3
2nd Otr 6/15/2017 <1.0 <1.0 <1.0 <1.0 33.4
3rdQtr 8/212017 <1.0 <1.0 <1.0 <1.0 33
4th Qtr 10/10/2017 <1.0 <1.0 <1.0 <1.0 30.9
1statr 3/14/2018 <1.0 <1.0 <1.0 <1.0 38.8
2nd Otr 6/1212018 <1.0 <1.0 <1.0 <1.0 34.4
3rdQtr 8/29/2018 <1.0 <1.0 <1.0 <1.0 40.3
4th Qtr 1211212018 <1.0 <1.0 <1.0 <1.0 35.2
1statr 3/16/2019 <1.0 <1.0 <1.0 <1.0 35
2nd Otr 6/13/2019 <1.0 <1.0 <1.0 <1.0 36.9
3rdQtr 9/11/2019 <1.0 <1.0 <1.0 <1.0 35.8
4th Qtr 12114/2019 <1.0 <1.0 <1.0 <1.0 40.6
1statr 3/17/2020 <1.0 <1.0 <1.0 <1.0 38.I
2nd Qtr 6/1212020 <1.0 <1.0 <1.0 <1.0 36.7
3rdQtr 9/17/2020 <1.0 <1.0 <1.0 <1.0 36.5
4th Qtr 11/4/2020 <1.0 <1.0 <1.0 <1.0 36.4
1st Qtr 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
4th Qtr 1218/2021 <1.0 <1.0 <1.0 <1.0 40.3
1stQtr 3/16/2022 <1.0 <1.0 <1.0 <1.0 34.3
2ndQtr 6/16/2022 <1.0 <1.0 <1.0 <1.0 35.5
3rdQtr 9/13/2022 <1.0 <1.0 <1.0 <1.0 40
4th Qtr 1217/2022 <1.0 <1.0 <1.0 <1.0 31.8
1stQtr 3/23/2023 <1.0 <1.0 <1.0 <1.0 35.6
2nd Qtr 6/15/2023 <1.0 <1.0 <1.0 <1.0 43.1
Shaded indicates coocentral!Of'ls exceedmg GWQS
H " Sample was analyzed beyond holding times and may not be accur11ate concentration.
Nitrate, Nitrate + Nitrite
•1omn/L)
0.95
0.952 1.7.
1-:-:\,
1.4•
1.5
1.84
2.1
1.7
1.7
1.R
2.7
2.0
2.3
2.5
2.71
2.
3. ,
3)
3.!
3.
3.
4.
4.13
3.79
3.62
3.85
3.69
3.49
3.64
<0.5 H
3.54
4.19
2.60
3.14
3.0
2.8
2.61
2.67
2.84
3.0
1.3
1.1
1.33
1.32
1.22
1.1
1.84
1.33
1.19
0.916
0.953
1.84
1.36
1.41
1.14
1.19
1.21
1.11
1.04
0.916
0.948
0.710
0.766
0.754
0.713
0.61
0.58
0.572
0.569
0.51
0.501
0.501
0.451
0.46
0.339
0.4
0.41
0.396
0.41
0.391
0.444
IVV<t-32
Sampling Event
TABLE 1 (30 of 33)
Historic Summary Of Monitoring Well Analytical Results Up To The 2nd Quarter 2023
Chloroform Contamination Investigation
OUSA White Mesa Mill
Parameter
IGWQSI
Carbon Tetrachloride Chloroform Chloromethane Methylene Chloride Chloride
15 ua/L) (70 "a/LI 130 ua/L) (5"a/L) No GWQS (mg/Ll
1.t+n Qtr 11/14/2013 <1.0 <1.0 <1.0 <1.0 52.1
1stQtr 1/2212014 <1.0 <1.0 <1.0 <1.0 54.5
2nd Qtr 5/21/2014 <1.0 <1.0 <1 .0 <1.0 54.9
3rd Ctr 8/13/2014 <1.0 <1.0 <1 .0 <1.0 64
4th Ctr 10/23/2014 <1.0 <1.0 <1.0 <1.0 62.6
1st Ctr 311 i72015 <1.0 <1.0 <1 .0 <1.0 64.2
DuplicateTW4-65 <1.0 <1.0 <1.0 <1.0 65.9
2nd Qtr 6/10/2015 <1.0 <1.0 <1.0 <1.0 62.7
3rdQtr 9/212015 <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
1st Ctr 3/15/2016 <1·~0 <1.0 <1.0 <1.0 64.2
2nd Ctr 5/25/2016 <1.0 <1.0 <1.0 <1.0 71.8
3rdOtr 7/28/2016 <1.0 <1.0 <1.0 <1.0 64.4
4th Qtr 10/19/2016 <1.0 <1.0 <1.0 <1.0 66
1stQtr 3/17/2017 <1.0 <1.0 <1.0 <1.0 62.8
2nd Ctr 6/15/2017 <1.0 <1.0 <1.0 <1.0 53.5
3rdQtr 8/212017 <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
1stOtr 3/14/2018 <1.0 <1.0 <1.0 <1.0 65.4
2nd Otr 6/1212018 <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
1stQtr 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
3rd Otr 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 Otr 6/10/2020 <1.0 <1.0 <1.0 <1.0 57.0
Qtr 9/17/2020 <1.0 <1.0 <1.0 <1.0 50.8
Qtr 11/4/2020 <1.0 <1.0 <1.0 <1.0 53.7
Qtr 3/17/2021 <1.0 <1.0 <1.0 <1.0 60.5
dQtr 6/15/2021 <1.0 <1.0 <1.0 <1.0 40.4
Qtr 9/15/2021 <1.0 <1.0 <1.0 <1.0 46.1
Qlr 1217/2021 <1.0 <1.0 <1.0 <1.0 55.0
Otr 3/16/2022 <1.0 <1.0 <1.o <1.0 48.0
dQtr 6/15/2022 <1.0 <1.0 <1.0 <1.0 49.4
Qtr 9/13/2022 <1.0 <1.0 <1.0 <1.0 51.8
licatoTW<-<;S <1.0 <1.0 <1.0 <1.0 53.6
Qlr 1217/2021 <1.0 <1.0 <1.0 <1.0 48.4
iitr 3/23/2023 <1.0 <1.0 <1.0 <1.0 43.6
Qtr 6/15/2023 <1.0 <1.0 <1.0 <1.0 49.3
TW4-33
Qtr 11/14/2013 <1.0 ~<1 .0 <1.0 47.2
st Otr 1/30/2014 <1.0 ""'"-----·fa'4 <1.0 <1.0 43.5
2nd Qtr 5/2212014 <1.0 121 <1.0 <1.0 46.8
3rdQtr 8/27/2014 <1.0 104 <1.0 <1.0 43
thQtr 10/29/2014 <1.0 124 <1.0 <1.0 44.2
st Qtr 3/1212015 <1.0 134 <1.0 <1.0 44.2
dQtr 6/11/2015 <1.0 127 <1.0 <1.0 46.6
Qtr 9/3/2015 <1.0 123 <1.0 <1.0 53.3
Qlr 10/29/2015 <1.0 129 <1.0 <1.0 44.5
Qtr 3/17/2016 <1.0 122 <1.0 <1.0 46.2
dQtr 6/8/2016 <1.0 96.1 <1.0 <1.0 49.7
Qtr 8/4/2016 <1.0 121 <1.0 <1.0 48.5
Qtr 10/26/2016 <1.0 109 <1.0 <1.0 52.4
Qlr 3/17/2017 <1.0 90.7 <1.0 <1.0 49.0
Qtr 6/20/2017 <1.0 103 <1.0 <1.0 49.2
Qtr 8/3/2017 <1.0 127 <1.0 <1.0 46.9
Qtr 10/11/2017 <1.0 97.1 <1.0 <1.0 42.5
Qtr 3/15/2018 <1.0 iiti <1.0 <1.0 49.2
Qtr 6/13/2018 <1.0 87.8 <1.0 <1.0 44.0
Qtr 9/5/2018 <1.0 113 <1.0 <1.0 50.0
4th Qtr 12113/2018 <1.0 141 <1.0 <1.0 43.2
1st Qtr 3/20/2019 <1.0 86.2 <1.0 <1.0 47.2
2nd Qtr 6/19/2019 <1.0 121 <1.0 <1.0 43.4
3rdQtr 9/1212019 <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.o <1.0 45.3
2nd Qtr 6/10/2020 <1.0 90.1 <1.0 <1.0 48.9 = 9/18/2020 <1.0 84.9 <1.0 <1.0 51.0
. 11/11/2020 <1.0 80.6 <1.0 <1.0 51.5
solrtsam le <10 68 <20 <20 54
st atr 3/18/2021 <·1.0 64.9 <1.0 <1.0 55.6
2nd Qtr 6/17/2021 <1.0 63.9 <1.0 <1.0 54.7
3rd Qtr 9/2212021 <1.0 60.2 <1.0 <1.0 42.5
thQtr 1218/2021 <1.0 68.9 _-:to <1.0 53.8
stQtr 3/23/2022 <1.0 53.1 <1.0 <1.0 51.4
2nd Qtr 6/2212022 <1.0 58.7 <1.0 <1.0 56.7
3rdQtr 9/14/2022 <1.0 53.9 <1.0 <1.0 42.2
4thQtr 1219/2022 <1.0 50.5 <1.0 <1.0 45.1
1stOtr 3/29/2023 <1.0 47.7 <1.0 <1.0 52.6
'"" n., 6/21/2023 <1.0 51.8 <1.0 <1.0 52.9
Shaded indicates concentrabons exceeding GWQS
H = Sample was analyzed beyond holding times and may not be accureate concentration.
Nitrate, Nitrate + Nitrite
(10 mg/L)
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 ao
2.31
1.57
1.34
1.80
1.20
1.59
1.81
1.68
1.53
1.77
1.82
2.56
1.63
1.50
2.22 uii
1.62
1.64
1.92
2.13
2.06
2.32
2.36
2.11
2.34
2.04
2.09
1.94
2.13
1.82
2.01 200
2.16
1.61
1.86
2.44
3.26
3.58
3.71
0.12 H
4.62
6.25
4.33
4.65
3.80
3.70
3.90
3.52
3.93
4.24
TABLE 1 (31 of33)
Historic Summary Of Monitoring Well Analytical Results Up To The 2nd Quarter 2023
Chlorofonn Contamination Investigation
DUSA White Mesa Mill
TW4-34
Sampling Event
Parameter
IGWQSl
Carbon Tetrachloride Chlorofonn Chloromethane Methylene Chloride Chloride
(5 µg/L) 170 ua/Ll (30 µa/L) (5 µail) No GWQS (mg/L)
Nitrate, Nitrate + Nitrite
110mg/L)
4thQt,,_r __ ~11,,.11""4"'12"'oc'13c+--<1;-c.o"---_____ <.~1'-'.o~ __ _,_<~1~.o'-___ --'-'<~1.~o _____ --1-_____ 1,_,9".2"--______ __,1".6"'4
1stQtr 1/23/2014 <1.0 ·<1.0 <1.0 <1.0 20.4 1.93
2ndQtr 5/22/2014 <1.0 <1.0 <1.0 <1.0 17.9 1.69
3rd Qtr 8/13/2014 <1.0 <1.0 <1.0 <1.0 18 1.10
4ih aii ······ 1~~~;~g;: :c;;'-'::g------l-'<""1."'0---+-'<1~.o,,_ ___ . ·+<~1'-':.o'-----+------'-g="} __ U.6 ~~d~r s,1·1"/2015 <1.0 :~:~ :~:g :~:g ···················· 1············ 11.4 o!J!
3rd Qtr 9/3/2015 <1.0 <1.0 <1.0 <1.0 15.1 0.458
~~"':;--~1cc'g~;;,li'=~gf~ Z11..=-g------+:; g :;"g'-----'~l'.g=-------+------;"'~'-'::~+-------'g"":~"'~"l~
2ndQtr 5/25/2016 <1.0 <1.0 <1.0 <1.lf 18 0.605
3rd Qtr 813/2016 <1.0 <1.0 <1.0 <1.0 17.2 0.726
,,~~:~~~t~;---1~f,~=~=2g=-;"'~+:-,-;)_,,:g:----------+-:c;)'-'::g-------,l--':c")"'g----+:-'c;ccg:-----------+----~~,+81~,___ _____ --"g~~
2nd atr 611s72oii -i1.o <t.o ...... <1.o <i:o 15.7 . 0:121
3rd Qtr 8/212017 <1.0 <1.0 <1.0 <1.0 19.8 ii:1:fa
4th Qtr 10/10/2017 <1.0 <1.0 <1.0 <1.0 18.5 0.774
D1Jpljcats_TW+65'-,-=-c=l-<-'-1'-'.0"--------+<1.0 <1.0 <1.0 20.4 0.784
1st Qtr 3/14/2018 <1.0 <1.0 <1.0 <1.0 19.1 ··-·oy37
2nd Qtr 6/13/2018 <1.0 <1.0 ..... ~1.Q <1.0 19.5 0.877 :iii! Qtr 8/29/2018 <1:d <1.0 <1.0 <1.0 23.8 0.736
4th Qtr 12/12/2018 <1.0 <i:o· <1.0 <1.0 18.5 ii:889
1st Qtr 3/16/2019 <1.0 <1.0 <1.0 <1.0 17.9 0.859
2ndQtr 6/13/2019 <1.0 <1.0 <1.0 <1.0 20.1 0.994
3rd Qtr 9/11/2019 <1.0 <1.0 <1.0 <1.0 17.8 0.934
4thOtr 12/14/2019 <1.0 <1.0 <1.0 <1'-'.o"------+------'2""1"'.4+------···---'-1"'.o"-111 1st Qtr 3/17/2020 ·•1 .o •·1·.o <1.0 •·1 .o 20.1 1.090
2nd Qtr 6/10/2020 <1.0 <1.0 <1.0 <1.0 20.9 1.240
3rd atr eiiii2020 <i:o <t .o <1 :o . <1.0 19.o o.978
4tiiatr 1114/2020 <i:o <1.0 <1.0 <i'-':o~-----+---··················--'1"8'-'.7+-------i:04 1stQtr 3/17/2021 <1.0 <1.0 <1.0 <1.0 19.3 1.09
2nd Qtr 6/16/2021 <1.0 <1.0 <1.0 <1.0 17.8 1.08
3rd Qtr 9/15/2021 <1.0 <1.0 <1.0 <1.0 15.0 1.1
"~"':~~='t~;--~~~~~g~ :~:g :~:g ~t~'------+:"-)"':g------+-------"~~c'::-f--------·--\~
2nd Qtr 6/16/2022 <1.0 <1.0 <1.0 <1.0 19.5 1.0 3rd Qtr 9/14/2022 <i".0 1.2 <1.0 •·i:o· . 18.8 0.788
4th air 12isi:1022 <1.0 ........ <1.0 <1.0 . <i:o _____ -+-----!.1-=7.0,_,___ _____ ..... i:is
1st Qtr 3/29/2023 <1.0 1.2 <1.0 <1:0 20) 1.1
2nd Qtr 6/20/2023 ·<1.0 1.2 <1.0 <1.0 21.2 1.09
TW4-35
3rd atr 81211201:i <1.0 <i:o <t .o <1.0 34 0.2
4th atr 10128,~12~0~14-+-<~1.~o _____ _,<1.o <1.~o ________ _,_<~1~.o'--------1------~34~·~1 f-------···········--"o~.3~51~1 1st Qtr 3/11/2015 <1.0 <1.0 <1.0 <1.0 34.9 0.436
2nd Qtr 6/10/2015 <1.0 <1.0 <1.0 <1.0 35.2 0.452
3rd Qtr 9/3/2015 <1.0 <1.0 <1.0 <1.0 35.9 0.304 {i~g:; ,g;~t1it~ 1rg~-----+:~:'-'g~---1-:~:~g~---➔1},~g-------+------3~3H•f----------'g":""19"1,,
2nd air ... 5/26/2016 <1.0 <i:0 <1.0 <i:0 -3.~A ...... 0.631
3rd Qtr 813/2016 <1.0 <i.o <1.0 <1.0 34.8 0.723 ~: g:; 1g;~~~g;~ :::g :: g ::"'g'-----+:"-;"'g------+-----;"'~"':~!.J--------g"":""~"'1:1
6/15/2017 <1.0 <1.0 <1.0 <1.0 34.8 0.699
812/2017 <1.0 <1.0 <1.0 <1.0 36.3 0.670
Qtr 1~;;~;~g:: :;g ::g :::g'----+:cc;:"'g-------+-----···";~='!4---------"g:"'~!,c~~I
.. atr 6/1:ii201il <1.0 <i:0 <1.0 <1.0 · 33.7 ·0.662
Qtr 8/30/2018 <1.0 <1.0 <1.0 <1.0 39.3 0.527
~-Jt\f~gc.c;':"+-':";:"g------+-'-:)"g"---+:'--';"'g'-------1:t.'"g-------+-------o!}i .. g~;:
Qtr 6/13/2019 <1.0 <1.0 <1.0 <1.0 35.5 0.670
Qtr 9/11/2019 <1.0 <1.0 <1.0 <1.0 31.7 0.525 g:; 1t;;;~g1~ ::g ~:"-g"---+:'--':"'g'------1::,g ;!! g:~~:
a1r····· 6111,2020 <1.0 •i".o <1.0 <1.0 :i<i:o o.699 01,·· 9/17/2020 <1.0 <·1.0 <1.0 <1.0 ·32.2 0.760
11/4/2020 <1.0 <1.0 <1.0 <1.0 30.4 0.756
3/17/2021 <fo <1.0 ·;;1 .0 <1.0 35.6 0.991
si1612021 <t.o <1.0 <1.0 <1.0 34.1 1.01
9/15/2021 <1.0 <1.0 <1.0 <1.0 27.5 1.2
~1g~1 ::g ::g ::g•----.... ::g=-------+-----~rc::.?'-':::+.-.-----~1;2~
i;11ei2022 ·•1.o <1.o <1.o <1.0 31.2 · ···1:6
911412022 <1.0 <i:o <1.0 <1.0 :i4.4 1.61
1·7f7J?n!n <1.0 <1.0 <1.0 <1.0 27.4 1.79
r a/29/2023 <i.o <1.0 <1.0 <1.0 33.8 1.74
Qtr 6/20/2023 <1.0 <1.0 <1.0 <1.0 29.8 1.91
Qtr
~Jr Qtr
Qtr
Qtr
Qtr
Qtr
4th~i
1VV'.H·,e,6an=112=01~4+<-1~.o~----~·.1.o --~<~1~.0---~.i:o 65 <ii:i
10/23/2014 <1.0 <1.0 .. ·.1:0·· . <1.0 67.3 · •ii:i
... . 3/11/2015 <1.0 <1.0 <1.0 <1.0 67.2 <0.1
6/10/2015 <1.0 <1.0 <1.0 <1.0 69.3 <0.1
9/3/2015 <1.0 <1.0 <1.0 <1.0 76.4 <0.1
1g~)~g~ ~fg :) g :) g ~~g~-----+-----~:c::;"':~+----------':o"'o:~:,
5/26/2016 <1.0 <1.0 <1.0 <1.0 ?..?..:.~ f................................... <0.1 .. ""i/28i2(f-f6' <f(j"" <1.0 <1.0 <"fjf 69.4 <0.1
10/20/2016 <1.0 <1.0 <1.0 <1.0 73.8 <0.1
1~ra~-TW~70 371"Si2cff1·:~-:g -~t:g ..................... :l~&-·· · · :~"":g~-----+-----~6c:;:"'.~+------:g:~
2nd Qtr 6/15/2017 <1.0 <1.0 <1.0 <1.0 71.3 <0.1
3rd Qtr 8/2/2017 <1.0 <1.0 <1.0 <1.0 69.6 <0.1
4thQtr 1011012011 <1.0 <1.0 <1.0 --+<'--'1"".o'------+-----·=62cc'."9f---------"o'-c.1c'o4,11 1stQtr 3/14/2018 <1.0 <1.0 <1.0 <1.0 73.8 <0.1 2ii"d atr e1121201ff <{O ·· ······ :c·1.o · · .<.f'O ................ · .:-::.fi:i,' 64.3 <0.1
3rd Qtr 8/29/2018 <1:0 <1.0 <1.0 <1.0 76.4 <0.1
4th Qtr 12/12/2018 <1.0 <1.0 <1.0 <1.0 65.8 0.123
1st Qtr 3/16/2019 <1.0 <1.0 <1.0 <1.0 65 0.116
2ndQtr 6/13/2019 <1.0 <1.0 <1.0 <1.0 71.5 <0.1
3rd Qtr 9/11/2019 <1.0 <1.0 <1.0 <1.0 69.6 <0.1
--1t;;~g1g :; g :; g :Jgr----+:"-;"'g------+-----~~~c'-:~ct---------:'-cg"-cl;I
6/11/2020 <1.0 <1.0 <1.0 <1.0 67.0 <0.1
9/17/2020 <1.0 <1.0 <1.0 <1.0 66.0 <0.1
<1.0 <1.0 <1.0 <1.0 64.0 <0.1
1stQtr 3/17/2021 <1.0 <1.0 <1.0 <1.0 72.5 <0.1
6/16/2021 <1.0 <1.0 <1.0 <1.0 68.7 <0.1
9/15/2021 <1.0 <1.0 <1.0 <1.0 63.1 <0.1
12/8/2021 <1.0 <1.0 <1.0 <1.0 69.9 <0.1
······3116/2022 <{O <1.0 <1.0 <1.0 61.2 ·o·.·;· 6/iS/2022.<"fo <f:O ·················· ···<io·· <1.0 .......... ,___ _____ a8.8 <0.1
911:l):1022 <1.0 <1.0 <1.0 •i.o 69.3 .a:,
stqtr
n <1.0 <1.0 <1.0 59.7 <0.1
<i":o <t.o <t.o 60.1 0.102
<1.0 <1.0 <1.0 68.9 <0.1 6/15/20231;~·~
Shaded 1nd1cates concentrations exceeding GWQS.
TW4-37
(chloroform pumping well 6/9115)
Sampling Event
2nd Otr 6/8/2015
3rn Otr 9/3/2015
4th Ctr 10/19/2015
1st Cir 3/9/2016
2nd Qtr 5/23/2016
3rn Otr 7/25/2016
4th Qtr 10/12/2016
1st Qtr 3/8/2017
2nd Otr 6/15/2017
3rnOtr 7/26/2017
4th Ctr 10/11/2017
1st Ctr 3/12/2018
2nd Ctr 6/8/2018
3rn Otr 8/22/2018
4th Ctr 11/28/2018
1st Otr 3/8/2019
2nd Ctr 6/5/2019
3rd Qtr 9/4/2019
4th Qtr 12/10/2019
1statr 2/19/2020
2nd Ctr 5/27/2020
3rnOtr 9/4/2020
4th Qtr 10/28/2020
1statr 2/23/2021
2nd Ctr 6/9/2021
3rnOtr 8/24/2021
4th Qtr 12/1/2021 1·s1 Qtr 3/9/2022
2nd Qtr 6/8/2022
3rnOtr 8/30/2022
4th Qtr 11/30/2022
1stQtr 3n12023
2nd Otr 6/20/2023
TW4-38
4th Qtr 11/10/2016
1st0tr 3/15/2017
2nd Qtr 6/15/2017
3rn Otr 8/2/2017
4th Qtr 10/10/2017
1st Otr 3/14/2018
2nd Otr 6/13/2018
3rnOtr 8/30/2018
4thQtr 12/12/2018
1st0tr 3/16/2019
2nd Qtr 6/13/2019
Duplicate TW4-70
3rd Qtr 9/11/2019
4th Qtr 12/14/2019
1stQtr 3/17/2020
2nd Qtr 6/11/2020
3rnOtr 9/18/2020
4th Qtr 11/4/2020
1st Qtr 3/18/2021
2nd Qtr 6/16/2021
DuplicateTW4-70
3rdQtr 9/15/2021
4th Qtr 12/8/2021
1st Qtr 3/22/2022
2nd Qtr 6/16/2022
3rd Qtr 9/14/2022
4th Qtr 12/7/2022
1st Qtr 3/29/2023
2nd0tr 6/20/2023
Duobaite TW4-70
TW4--39tenio.-oronn pumpr,g we1
(11/2016)
4th Otr 11/11/2016
1st Otr 3/8/2017
2nd Qtr 6/15/2017
3rd Otr 7/26/2017
4th Otr 10/10/2017
1st Otr 3/12/2018
2nd Qtr 6/8/2018
3rnOtr 8/22/2018
4th Qtr 11/28/2018
1st0tr 3/8/2019
2nd Otr 6/512019
3rnOtr 9/4/2019
4th Qtr 12/10/2019
1stQtr 2/1912020
2nd Qtr 5/27/2020
3rnOtr 9/18/2020
4th Qtr 10/28/2020
1st0tr 2/23/2021
2nd Qtr 6/9/2021
3rn Otr 8/24/2021
4th Otr 12/1/2021
1st0tr 3/9/2022
2nd Otr 6/8/2022
3rnOtr 8/30/2022
4th Otr 11/30/2022
1st0tr 3n/2023
2nd0tr 6/13/2023
TABLE 1 (32 of 33)
Historic Summary Of Monitoring Well Analytical Results Up To The 2nd Quarter 2023
Chlorofonn Contamination Investigation
OUSA White Mesa Mill
Parameter
(GWQS)
Carbon Tetrachloride Chloroform Chloromethane Methylene Chloride Chloride
15 ua/L) 170 ua/LI (30 ua/LI (5 ug/L) No GWQS (mg/LI
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 3,5°7 1.34 332
14.4 16,200 3.57 1.17 389
16.7 15,900 <1.0 <1.0 294
16.3 16,400 <1.0 <1.0 304 15.4 18,000 3.57 1.34 305
16.2 15,800 <1 .0 <1.0 281
15.1 15,000 <1 .0 <1.0 277
12.6 15,500 2.47 <1.0 255
12.8 12,900 1.14 <1.0 263
10.6 14,400 <1 .0 <1.0 275
12.1 14,100 6.2 <1.0 387
11.3 15,200 19.8 <1.0 264 -,H 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 13,100 3.12 <1.0 220 ··-a13 12,000 12.3 <1.0 236
11.8 11,700 1,44 <1.00 321
9.62 13,800 <1.0 <1.0 273
6.52 10,300 29.4 <1.0 254
<1.0 9,380 <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 14,800 6.l 5.05 410 122 .. 13,700 <1.0 <1.0 414
8.2 46,800 12 <1.0 276
5.4 11,600 2.4 <1.0 243
5.7 9,640 <1.0 <1.0 578
<1.0 8,010 <1.0 <1.0 209
1.6 8 160 5.7 <1.0 329
<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.o <1.0 <1.0 <iO 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 <1.0 <1.0 <1.0 37.3
<1.0 <1.0 <1.0 <1.0 32.9
<1.0 <1.0 <1.0 <1.0 36.4
<1.0 <1.0 <1.0 <1.0 37.2
<1.0 <1.0 <1.0 <1.0 36.3
<1.0 <1.0 <1.0 <1.0 40.6
<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 6,520 2.33 <1.0 123
1.2 885 <1.0 <1.0 49
11 .6 8,640 <1.0 <1.0 114
5.71 4,240 <1.0 <1.0 48.2
1,14 1,§50 <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
1.4 982 <1.0 <1.0
76:1 <1.0 843 <1.0 <1.0 85.2
1.2 1.720 <1.0 <1.0 80.6
<1.0 --1,850 <1.0 <1.0 38,7
1.8 3 330 3.1 <1.0 75.4
Shaded indicates coocentrations exceeding GWQS.
Nitrate, Nitrate + Nitrite
l10ma/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
~9
26.6
25.8
31.3
29.8
28.0
26.6
30.9
19.1
35.9
11.2
10,6
10.8
10.1
10.3
9.34
9.48
7.77
8.48
8.96
8.53
9.52
7.61
7.51
8.11
9.00
7.35
7.72
8.24
9.59
9.05
8.04
8.02
7.7
7.9
7.57
8.9
8.78
8.2
8.14
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
9.0
3.72
7.86
1.37
8.0
TW4-40
(chloroform pumping well
5/2019)
Sampling Event
1st Ctr 3/21/2018
2nd Qtr 6/13/2018
3rdQtr 9/5/2018
4th Qtr 12/12/2018
~i.~~•ff TW4-75
, ,;,, ,.,ur 3/20/2019
1d Qtr 6/5/2019
Qtr 9/4/2019
Qtr 12/10/2019
Qtr 2/19/2020
,dQtr 5/27/2020
Qtr 9/4/2020
Qtr 10/28/2020
Qtr 2/23/2021
,dQtr 6/9/2021
Qtr 8/24/2021
Qtr 12/1/2021
Qtr 3/9/2022
Qtr 6/8/2022
Qtr 8/30/2022
Qtr 11/30/2022
Qtr 3/7/2023
"'' ""''°n?3
TW4-41(ehlorolormpumpITTg-ll
51"2018)
:nd Qtr 5/8/2018
,rdQtr 8/22/2018
h Ctr 11/28/2018
1st Ctr 3/8/2019
2nd Qtr 6/5/2019
3rd Qtr 9/4/2019
4th Qtr 12/10/2019
1st Ctr 2/19/2020
2nd Qtr 5/27/2020
3rd Qtr 9/4/2020
4th Qtr 10/28/2020
1st Ctr 2/23/2021
2nd Qtr 6/9/2021
3rd Qtr 8/24/2021
4th Qtr 12/1/2021
1st Ctr 3/9/2022
2nd Qtr 6/8/2022
3rdQtr 8/30/2022
thQtr 11/30/2022
st Ctr 3/7/2023
?no Qtr 6/13/2023
TW4-42
2nd Qtr 6/19/2019
3rdQtr 9/11/2019
4th Qtr 12/10/2019
QuolicateTW4-75
1st Ctr 2/17/2020
2nd Qtr 6/10/2020
3rdQtr 9/17/2020
4th Qtr 11/4/2020
1st Ctr 3/17/2021
2nd Qtr 6/15/2021
3rd atr 9/15/2021
4th Qtr 12/9/2021
1st Ctr 3/15/2022
DuplicateTW4-65
2nd Qtr 6/15/2022
3rd Qtr 9/13/2022
4th Qtr 12/7/2022
1st Ctr 3/22/2023
2nd Qtr 6/15/2023 --
TW4-43
4th Qtr 12/9/2021
1st Ctr 3/17/2022
12nd Qtr 6/16/2022
l3rd at, 9/13/2022
l~th Qtr 12/7/2022
1stQtr 3/23/2023
l?nt1 Qtr 6/15/2023
TABLE 1 (33 of 33)
Historic Summary Of Monitoring Well Analytical Results Up To The 2nd Quarter 2023
Chloroform Contamination Investigation
DUSA White Mesa Mill
Parameter
(GWQS)
Carbon Tetrachloride Chloroform Chloromethane Methylene Chloride Chloride
(5 µg/L) 170 un/LI (30 ug/L) (5 µo/L) No GWQS lmn/L)
<1.0 248 <1.0 <1.0 35.7
<1.0 131 <1.0 <1.0 31.6
<1.0 116 <1.0 <1.0 37.6
<1.0 118 <1.0 <1.0 29.9
<1.0 119 <1.0 <1.0 32.3
<1.0 111 <1.0 <1.0 --------30.9 <1.0 ----263 <1.0 ______ <1.0 ---35.6
<1.0 380 <1.0 <1.0 35.9
<1.0 314 <1.0 <1.0 36.7
<1.0 364 <1.0 <1.0 38.5
<1.0 367 <1.0 <1.0 36.5
<1.0 333 <1.0 <1.0 34.2
<1.0 264 <1.0 <1.0 34.6
<1.0 436 3.51 <1.0 36.0
<1.0 343 <1.0 <1.0 27.5
<1.0 301 1.32 <1.0 31.8
<1.0 286 <1.0 <1.0 38.4
<1.0 238 <1.0 <1.0 36.8
<1.0 323 <1.0 <1.0 36.6
<1.0 302 <1.0 <1.0 39.3
<1.0 298 <1.0 <1.0 44.8
<1.0 259 <1.0 <1.0 . . . . 23.5
<1.0 220 1.3 <1.0 37.6
<1.0 ,_ 1.400 <1.0 <1.0 42.8
<1.0 1.390 <1.0 <1.0 45.5
<1.0 1.go <1.0 <1.0 41.4
<1.0 1,220 <1.0 <1.0 39.1
<1.0 1,320 <1.0 <1.0 38.1
<1.0 1,190 <1.0 <1.0 39.4
<1.0 -----·-· 1.410 <1.0 <1.0 42.1
<1.0 1,200 <1.0 <1.0 44.4
<1.0 1,220 <1.0 <1.0 41.7
<1.0 1,110 <1.0 <1.0 40.2
<1.0 1,020 <1.0 <1.0 39.7 -~-i_'O 1,170 <1.0 <1.0 40.6
<1.0 1.130 <1.0 <1.0 39.5
<1.0 1,100 <1.0 <1.0 37.1
<1.0 1,030 <1.0 <1.0 43.2
<1.0 1,030 <1.0 <1.0 37.3
<1.0 1,010 <1.0 <1.0 41.1
<1.0 1,060 <1.0 <1.0 41.9
<1.0 1,050 <1.0 <1.0 38.0
<1.0 985 <1.0 <1.0 34.4
<1.0 1 040 1.8 <1.0 40.3
<1.0 <1.0 <1.0 <1.0 23.3
<1.0 <1.0 <1.0 <1.0 20.6
<1.0 <1.0 <1.0 <1.0 22.6
<1.0 <1.0 <1.0 <1.0 22.6
<1.0 <1.0 <1.0 <1.0 23.2
<1.0 <1.0 <1.0 <1.0 23.1
<1.0 <1.0 <1.0 <1.0 23.5
<1.0 <1.0 <1.0 <1.0 22.4
<1.0 -<,.o <1.0 <1.0 242
<1.0 <1.0 <1.0 <1.0 24.6
<1.0 <1.0 <1.0 <1.0 16.6
<1.0 <1.0 _<1_.o <1.0 24.2
<1.0 <1.0 <1.0 <1.0 21.5
<1.0 <1.0 . <1.0 <1.0 17.7
<1.0 <1.0 <1.0 <1.0 24.0
<1.0 <1.0 <1.0 <1.0 15.6
<1.0 <1.0 <1.0 <1.0 36.4
<1.0 <1.0 <1.0 ·<·1·•.-0 21.2
<1.0 <1.0 <1.0 <1.0 20.9
<1.0 <1.0 <1.0 <1.0 22.7
<1.0 <1.0 <1.0 <1.0 40.6 <1·.o <1.0 <1.0 <1.0 39.2
<1.0 <1.0 <1.0 <1.0 41.8
<1.0 <1.0 <1.0 <1.0 43.1
<1.0 ~J_.o <1.0 <1.0 40.7
<1.0 <1.0 <1.0 <1.0 28
<1.0 <1.0 <1.0 <1.0 41.7
Shaded 1ndtcates concentrabOns exceeding GWOS (2) Chlornform_puJTllnQ weM started in Ma,t2019 ______ _
Nitrate, Nitrate+ Nitrite
11omo/L1
3.08
3.33
3.22
3.54
3.18 ___________ 3.18
3.55
3.39
2.89
2.98
2.91
2.88
2.58
2.43
3.77
1.50
2.60
2.5
1.90
2.22
2.24
1.28
2.04
6.54
6.13
6.02
6.71
6.00
6.22
6.11
6.12
6.78
6.69
6.25 -6.41
7.45
3.77
6.72
e-:-2
6.0
5.92
6.0
4.3
6.27
2.57
2.75
2.82
2.95
2.88
3.23
3.65
2.77
3.15
3.57
3.26
2.02
2.5
2.6
3.3
3.3
2.02
2.8
3.14
3.2
0.118
0.4
0.24
0.383
0.383
0.384
0.43
Parameter GWQS
Chloride none
Nitrate + Nitrite (as N) 10 mg/L
Chloroform 70 µg/L
Carbon tetrachloride 5 µg/L
Chloromethane 30 µg/L
Methvlene Chloride 5 ua/L
nc = not calculated
Table 2
Summary of EFR QA/QC Samples
2nd Quarter 2023
Duplicate Samples of Wells
Duplicate of TW4-42 Duplicate of TW4-38
TW4-42 TW4-65 RPO TW4-38 TW4-70 RPO
20.9 22.7 -8.3 36.3 40.6 -11.2
3.14 3.2 -1.9 8.200 8.14 0.7
<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
High lighted exceeding PRO (Relitve % difference) of 20%
Duplicate of TW4-9
TW4-9 TW4-75 RPO
38.0 38.0 0.0
0.742 0.733 1.2
5.0 4.8 4.1
<1.0 <1.0 nc
<1.0 <1.0 nc
<1.0 <1.0 nc
Well ID MW4 MW-26 TW4-1
C1>chloroform (ug/L) 1,050 2,230 830
Chloroform (g/L) 1.05E-03 2.23E-03 8.30E-04
Chloroform (lbs/L) 2.32E-06 4.93E-06 1.83E-06
Chloroform (lbs/call 8:78E-06 1.86E-05 6.94E-06
Total gallons pumped 91 ,310.8 25,207.6 7,825.6
lbs of chloroform removed 0.8 0.5 0.05
Gallons of chloroform removed 0.07 0.04 0 00
total lbs of chloroform removed 11.1
total aallons of chloroform removed 0.9
Tabel3
Chloroform Mass Removal Calculations for the 2nd Qurater 2023
EFR White Mesa Mill, Bland, Utah
TW4-2 TW4-4 TW4-11 TW4-19 TW4-21 TW4-22
788 1,980 2,510 4,850 657 2,180
7.88E-04 1.98E-03 2.51E-03 4.85E-03 6.57E-04 2.18E-03
1.74E-06 4.37E-06 5.55E-06 1.07E-05 1.45E-06 4.82E-06
6.59E-06 1.66E-05 2.10E-05 4.06E-05 5.49E-06 1.82E-05
11 ,931 .8 7,407.0 1,159.5 117,218.0 83,501 .7 22,375.4
0.08 0.1 0.02 4.75 0.5 0.41
0.01 0.01 0.00 0.39 0.04 0.03
1) Assuming that the chloroform concentration result for the quarter monitoring event is the average chloroform concentration for the e_ntire quarter.
TW4-24 TW4-25 TW4-37 TW4-39 TW4-40 TW4-41
58.3 0 8,160 3,330 220 1,040
5.83E-05 O.OOE+OO 8.16E-03 3.33E-o3 2.20E-04 1.04E-03
1.29E-07 O.OOE+OO 1.80E-05 7.36E-06 4.86E-07 2.30E-06
4.88E-07 O.OOE+OO 6.82E-05 2.78E-05 1.84E-06 8.70E-06
52,081 .4 94,118.3 42,641 .9 28,777.7 45,516.3 10,239.7
0.025 0.00 2.9 0.8 0.08 0.1
0.002 0.00 0.24 0.07 0.01 0.01