DRC-2022-024039 - 0901a0688113b7d1

State of Utah
SPENCER J. COX
Governor
DEIDRE HENDE RSON
lieutenant Governor
Department of
Environmental Quality
Kimberly D. Shelley
Executive Director
DIVISION OF WASTE MANAGEMENT
AND RA DIATION CONTROL
Douglas J. Hansen
Director
MEMORANDUM
TO: Phil Goble r/26 ¥ ~~(.._
FROM: Dean Henderson HJ ll;jt) fi(?JZ
DA TE: November 30, 2022
SUBJECT: Review of the August 8, 2022 2nd Quarter, 2022 Chloroform Monitoring Report for the
Chloroform Contamination Investigation, Energy Fuels Resources (USA) Inc. ("EFRI")
White Mesa Uranium Mill ("Mill"), near Blanding, Utah.
The Utah Division of Waste Management and Radiation Control ("Division") has reviewed the August
8, 2022, 2nd Quarter, 2022 Chloroform Monitoring Report ("Report") for the Chloroform
Contamination Investigation. For the review of this report the following regulatory enforcement
documents were used:
• EFRI issued Ground Water Quality Discharge Permit No. UGW370004 ("Permit"). Permit
version that was signed on March 19, 2019.
• The EFRI Quality Assurance Plan ("QAP") September 10, 2019 (Revision. 7 .6)
• The EFRI Groundwater Corrective Action Plan ("GCAP") September 14, 2015 (Revision 0)
• Utah Stipulation and Consent Order Docket Number UGW20-01, September 16, 2015.
REVIEW
GCAP Part III.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 15, 2022 (date of Report
August 8, 2022) which meets the GCAP requirement.
Monitor Well Sampling
The following 43 monitor wells were sampled as required in the GCAP (see Table 1 below):
MW-4 TW4-3 TW4-8 TW4-13 TW4-21 TW4-26 TW4-31 TW4-36 TW4-41
MW-26 TW4-4 TW4-9 TW4-14 TW4-22 TW4-27 TW4-32 TW4-37 TW4-42
MW-32 TW4-5 TW4-10 TW4-16 TW4-23 TW4-28 TW4-33 TW4-38 TW4-43
TW4-l TW4-6 TW4-l l TW4-18 TW4-24 TW4-29 TW4-34 TW4-39
TW4-2 TW4-7 TW4-12 TW4-19 TW4-25 TW4-30 TW4-35 TW4-40
DRC-20 195 North 1950 West• Salt Lake City, UT
Mailing Address: P.O. Box 144880 • Salt Lake City, UT 84114-4880
Telephone [phone] • Fax [phone] • TD.D. (801 ) 536-4284
www.deq.1ital1.gov
Printed on I 00% recycled paper
DRC-2022-024039
Page2
The water samples for the above wells were analyzed for the following constituents as required in the
QAP:
Chloroform
Chloromethane
Carbon tetrachloride
Chloride
Methylene chloride
Nitrate + Nitrite as Nitrogen.
The analytical methods used is consistent with the requirements of the GCAP. For a summary of the
2nd Quarter, 2022 and historic analytical results see Table 1 below.
Groundwater Head Monitoring
Depth to groundwater was measured in the following wells and/or piezometers, as required in Part I.E.3
of the Permit:
• The quarterly groundwater compliance monitoring wells.
• Existing monitoring well MW-4 and all of the temporary chloroform investigation wells.
• Piezometers P-1, P-2, P-3A, P-4 and P-5.
• MW-20 and MW-22.
• Nitrate monitoring wells.
• The DR piezometers which were installed during the Southwest Hydrologic Investigation.
In addition, weekly and monthly depth to groundwater measurements were taken in pumping wells
MW-4, MW-26, TW4-l, TW4-2, TW4-4, TW4-11, TW4-19, TW4-21, TW4-22, TW4-24, TW4-25,
TW4-37, TW4-39, TW4-40, TW4-41, TW4-42, and TWN-2.
The monitoring wells were purged using the three approved QAP well purging strategies and meet QAP
requirements for each strategy:
1. Purging two casing volumes with stable field parameters for specific conductivity,
turbidity, pH, redox potential, and water temperature (within 10% RPD):
Wells: MW-32, TW4-5, TW4-8, TW4-9, TW4-16, TW4-18, TW4-23, TW4-32, and TW4-38.
2. Purging a well to dryness and stability of field parameters for pH, specific conductivity, and
water temperature only after recovery:
Wells: TW4-3, TW4-6, TW4-7, TW4-10, TW4-12, TW4-13, TW4-14, TW4-26, TW4-27,
TW4-28, TW4-29, TW4-30, TW4-31, TW4-33, TW4-34, TW4-35, TW4-36, TW4-42, TW4-43.
3. The pumping wells are continuously pumped on a set schedule and are sufficiently purged to
collect a sample
Pumping Wells: MW-4, MW-26, TW4-1, TW4-2, TW4-4, TW4-11, TW4-19,
TW4-21, TW4-22, TW4-24, TW4-25, TW4-37, TW4-39, TW4-40, and TW4-41.
Page 3
Holding Times
The water samples method holding times for each parameter for samples collected at each monitor well
were received and analyzed within the required holding times stated in the QAP.
Receipt Temperature
Water samples were received within the required QAP temperature limit of 6° C.
Analytical Methods
The analytical methods reported to be use by the laboratory to analyze Chloroform, Chloride,
Chloromethane, Methylene chloride, Carbon tetrachloride, and Nitrate + Nitrite as Nitrogen are
incompliance with analytical methods required in the Chloroform QAP.
Detection Limits
Analyses were measured and reported to the required reporting limits. However, several sets of sample
results had the reporting limit raised for at least one analyte due to matrix interference and/or sample
dilution. In all cases the reported value for the analyte was higher than the increased detection limit.
EFR Duplicate Sample Comparison
Three duplicate samples were collected. Monitor well TW4-42 and its duplicate sample TW4-65, and
TW4-38 and its duplicate sample TW4-70; and TW4-18 and its duplicate sample TW4-75. All analytical
results for the three sample/duplicate pairs were within the 20% relative percent difference (RPD).
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 2022 is 21.8 lbs. (see Table 3 below) which is more than the estimated 8.4 lbs.
removed in the 1st Quarter 2022. The greater mass removal is primarily due to increase in
concentrations in TW4-19 and TW4-37.
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 1,124 lbs. in the 2nd Quarter, 2022. This
approximately 413 lbs. larger than the 1st Quarter 2022 estimated mass of 413 lbs.
As per Part 111.B.2 of the GCAP, the electronic files were used in 2nd Quarter, 2022 to calculate the
mass estimates. The following files were used to calculate the estimated chloroform mass within the
chloroform plume:
• Excel spreadsheet that included: well name; well location ( easting and northing); Laboratory
reported concentration in µg/1 in the 2nd Quarter, 2022 and corresponding log equivalent values.
• Surfer® griding parameters: kriging parameters: SURFER™default parameters (point kriging,
linear variogram, slope= 1, no anisotropy [anisotropy= 1], no search constraints; 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
Page4
• 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
e) Electronic copy of all laboratory results for Chloroform Investigation monitoring conducted
during the quarter.
f) Copies ofDUSA field records, laboratory reports and chain of custody forms.
Page 5
Evaluation of the Chloroform Contaminate Plume and Its Associated Contaminants
Bounding Chloroform Plume
Groundwater monitoring data up to the 2nd Quarter, 2022 monitoring event appeared to show that the
chloroform contaminate plume ("Plume") and associated contaminants ( carbon tetrachloride,
chloromethane, and methylene chloride) is bound by up gradient, cross gradient, and down gradient
compliance monitoring wells that have a chloroform concentration of <70 µg/L ("GWQS = 70 µg/L).
Performance Monitor Wells ("PM") [Wells Exceeding Chloroform Concentrations GWOS of 70µg/L]
Six (6) PM wells still exceed 70 µg/L: TW4-7, TW4-10, TW4-16, TW4-26, TW4-29, and TW4-30
Compliance Monitor Wells ("CM") [Wells with Chloroform Concentrations between< 1 and 70µg/L]
Eight (8) CM wells range with detectable chloroform concentration but still below 70µg/L: TW4-5,
TW4-6, TW4-8, TW4-9, TW4-14, TW4-18, TW4-27, and TW4-33.
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, TW4-23, TW4-28, TW4-31, TW4-32, TW4-34, TW4-35, TW4-36, TW4-
38, TW4-42, and TW4-43.
Pumping Wells
There are 15 pumping wells in full operation in the 2nd Quarter, 2022, 14 pumping wells MW-4, MW-
26, TW4-l, TW4-2, TW4-4, TW4-11, TW4-19, TW4-21 TW4-22, TW4-24, TW4-37, TW4-39, TW4-
40, and TW 4-41 exceed chloroform concentrations of 70 µg/L. Pumping well TW 4-25 had a non-
detectable (<1.0 µg/L) chloroform concentration (see table 1 below).
Nitrate, Nitrate + Nitrite ("nitrate") Concentrations
Pumping wells TW4-22 (45.0 mg/L) and TW4-24 (35.0 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 (20.0 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 2022
below the nitrate GWQS of2.9 mg/L, 2.8 mg/L, and 0.41 mg/L respectiveiy. Therefore, at this time no
action is recommended. However, should future nitrate concentrations in these three down and/or cross
gradient wells increases to above 10 mg/L or shows an increasing trend an additional investigation may
be recommended.
Conclusions on Compliance with the Permit and QAP
Per the Division review it appears that the Report complies with Permit, QAP, and GCAP. Therefore, a
letter will be drafted notifying EFRI of the review and closing out of for the August 8, 2022, 2nd
Quarter, 2022 Chloroform Monitoring Report for the chloroform contamination investigation.
·Page 6
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)
Quarter 2022, August 8. 2022 (DRC-2022-020020)
Page 7
Tables 1 through 3
MW4 {chlofotorm pumping well
staned pumplngl/4103)
Sampling Event
TABLE 1 (1 of 33)
Historic Summary Of Monitoring Well Analytical Results Up To The 2nd Quarter 2022
Chloroform Contamination Investigation
DUSA White Mesa Mill
Parameter
IGWQS)
Carbon Tetrachloride Chloroform Chloromethane Methylene Chloride Chloride
15 uo/LI 170 ua/Ll 130 ua/LI 15 ua/Ll No GWQS lma/Ll
1s1Qtr 3/16/2005 NA 2,900 NA NA
2nd Qtr 5/25/2005 NA 3,170 NA NA
3rdQtr 8/31/2005 <10 3,500 <10 <10
4thQtr 1217/2005 <50 3,000 <50 <50
1stQtr 3/9/2006 <50 3,100 <50 <50
2nd Qtr 6/14/2006 <50 3,000 <50 <50
3rdQtr 7/20/2006 <50 2,820 <50 <50
4thQtr 11/8/2006 2.1 2 830 1.4 <1.0
1stQtr 2/28/2007 1.6 2,300 <1.0 <1.0
2nd Qtr 6/27/2007 1.8 2,000 <1.0 <1.0
3rdQtr 8/15/2007 1.9 2,600 <1.0 <1.0
4thQtr 10/10/2007 1.7 2 300 <1.0 <1.0
1stQtr 3/28/2008 1.7 2,400 <1.0 <1.0
2nd Qtr 6/25/2008 1.8 2,500 <1.0 <1.0
3rdQtr 9/10/2008 1,8 1,800 <1.0 <1.0
4thQtr 10/15/2008 1.7 2,100 <1.0 <1.0
1stQtr 3/4/2009 1.5 2,200 <1.0 <1.0
2nd Qtr 6/23/2009 1.3 1,800 <1.0 <1.0
3rdQtr 9/14/2009 1.4 2,000 <1.0 <1.0
4thQtr 12/14/2009 1.6 1,800 <1.0 <1.0
1stQtr 2/17/2010 1.2 1,600 <1.0 <1.0
2nd Qtr 6/14/2010 1.2 2,100 <1.0 <1.0
3rdQtr 8/6/2010 1.5 1,900 <1.0 <1.0
4thQtr 10/15/2010 1.4 1500 <1.0 <1.0
1stQtr 2/23/2011 1.5 1,700 <1.0 <1.0
2nd Qtr 6/1/2011 1.4 1,700 <1.0 <1.0
3rd Qtr 8/17/2011 1.1 1,700 <1.0 <1.0
4th Qtr 11/16/2011 1.3 1,600 <1.0 <1.0
ist Citr (1) 1/23/2012 1 ___ ,!_.~0,2 2 1.0 ------<1.0
2nd Qtr 6/6/2012 1.2 1,400 <1.0 <1.0 -------
3rdQtr 9/4/2012 1.5 1,500 <1.0 <1.0
4th Qtr 10/4/2012 1 1,300 <1.0 <1.0
1stQtr 2/11/2013 1.48 1,670 <1.0 <1.0
2ndQtr 6/5/2013 1.31 1,490 <1.0 <1.0
3rdQtr 9/3/2013 1.13 1,520 <1.0 <1.0
4thQtr 10/29/2013 5.58 1,410 <1.0 <1.0
1stQtr 1/27/2014 4.15 1,390 <1.0 <1.0
2nd Qtr 5/19/2014 5.21 1,390 <1.0 <1.0
3rdQtr 8/11/2014 7.6 1,490 <1.0 <1.0
4th Qtr 10/21/2014 <1.0 ___ 1_,'.!_4,2 <1.0 <1.0 ~--------<1.0 --------1st Qtr (2) 3/9/2015 1.26 1,400 <1.0
2nd Qtr 6/8/2015 <1.0 1,300 <1.0 <1.0
3rdQtr 8/31/2015 <1.0 1,200 1.42 <1.0
4th Qtr 10/19/2015 <1.0 1,200 <1.0 <1.0
1stQtr 3/9/2016 <1.0 1,240 <1.0 <1.0
2ndQtr 5/23/2016 1.44 1,580 <1.0 <1.0
3rd Qtr 7/25/2016 <1.0 1,430 <1.0 <1.0
4th Qtr 10/12/2016 1.24 1,470 <1.0 <1.0
1stQtr 3/8/2017 1.22 1,450 <1.0 <1.0
2ndQtr 6/13/2017 1.15 1,430 <1.0 <1.0
3rd Qtr 7/26/2017 1.15 1,400 <1.0 <1.0
4th Qtr 10/11/2017 <1.0 1,320 <1.0 <1.0
DWMRC s lit samole <19 1,400 <30 70 J_
1stQtr 3/12/2018 1.07 1,320 <1.0 <1.0
2ndQtr 6/8/2018 <1.0 1,240 <1.0 <1.0
3rd Qtr 8/22/2018 <1.0 1,300 <1.0 <1.0
4th Qtr 11/28/2018 <1.0 1,330 <1.0 <1.0
1stQtr 3/8/2019 <1.0 1,190 <1.0 <1.0
2ndQtr 6/5/2019 <1.0 1,300 <1.0 <1.0
3rd Qtr 9/4/2019 <1.0 1,180 <1.0 <1.0
4th Qtr 12/10/2019 <1.0 1 370 <1.0 <1.0
1stQtr 2/19/2020 <1.0 1,230 <1.0 <1.0
2ndQtr 5/27/2020 <1.0 1,250 <1.0 <1.0
3rd Qtr 9/4/2020 <1.0 1,240 <1.0 <1.0
4th Qtr 10/18/2020 <1.0 1,050 <1.0 <1.0
1stQtr 2/23/2021 <1.0 1,150 <1.0 <1.0
2ndQtr 6/9/2021 <1.0 1,320 <1.0 <1.0
3rd Qtr 8/24/2021 <1.0 1,140 <1.0 <1.0
4th Qtr 12/1/2021 <1.0 1,100 <1.0 <1.0
1stQtr 3/9/2022 <1.0 1,040 <1.0 <1.0
2ndQtr 6/8/2022 <1.0 1 010 <1.0 <1,0
MW-4AfTW4-Al
1stQtr 3/16/2005 NA 3,700 NA NA
2ndQtr 5/25/2005 NA 3,740 NA NA
3rd Qtr 8/31/2005 <10 3,800 <10 <10
4thQtr 12/7/2005 <50 3,000 <50 <50
1stQtr 3/9/2006 <50 3,700 <50 <50
2nd Qtr 6/14/2006 <50 3,300 <50 <50
3rd Qtr 7/20/2006 <50 3,190 <50 <50
4thQtr 11/8/2006 2.4 3 370 <1.0 <1.0
1stQtr 2/28/2007 1.9 2,500 <1.0 <1.0
Well abandonded
(1) As of March 2012 both north and south wild life ponds no longer receiving water
(2) chloroform pumping wells TW4-1. TW4-2, and TW4-11 started m 1/14115 __ ,
NA = not analyzed
Shaded indicates concentrations exceeding GWQS.
Bold and italics indicates the MDL exceeded the GWOS.
J = Approximated value
NA
NA
NA
53
49
49
48
50
47
45
47
45
42
42
35
45
37
34
43
44
45
41
38
41
40
35
41
40
41.0
39.0
41.0
41.0
37.8
44.0
41.4
40.1
38.5
39.9
41.0
41.5
40.7
43.1
44.3
40.8
42.2
43.7
42.5
44.8
43.3
44.0
43.8
43.8
43.0
46.2
43.5
48.5
43.1
41 .5
40.6
41 .9
45.5
48.1
40.7
43.8
41.4
46.5
34.8
43.2
47.6
40.9
43.7
NA
NA
NA
55
53
54
54
54
60
Nitrate, Nitrate + Nitrite
110 ma/LI
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
408
3.7
5.07
5.75
2.53
4.79
4.43
5.15
4.54
4.95
4.88
4.99
4.88
4.59
5.25
5.1
4.47
4,64
4.55
4.44
5.05
5.16
4.69
4.34
6.22
5.04
4.93
4.62
4.61
6.48
3.83
4.90
4,80
3.9
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 2022
Chloroform Contamination Investigation
DUSA White Mesa Mill
MW-26 (fofmer TW4-15) Chlofoform
pumpingwe115t■rted818/03
Sampling Event
Parameter
IGWQSI
1stQtr
2ndQtr
3rdQtr
4th Qtr
1stQtr
2nd Qtr
3rdQtr
4thQtr
1stQtr
2ndQtr
3rd Qtr
4th Qtr
1stQtr
2ndQtr
3rd Qtr
4th Qtr
1stQtr
2ndQtr
3rd Qtr
4th Qtr
1stQtr
2nd Qtr
3rd Qtr
4thQtr
1stQtr
2ndQtr
3rd Qtr
4th Qtr
Carbon Tetrachloride
15 ua/Ll
Chloroform
170 ua/Ll
Chloromethane
130 ua/Ll
Methylene Chloride Chloride Nitrate, Nitrate + Nrtrite
15 ua/Ll No GWQS Ima/LI 110 ma/Ll
3/16/2005 NA 310 NA NA NA 0.3
5/25/2005 NA 442 NA NA NA 0.2
8/31/2005 <5.0 960 5.4 <5.0 NA 0.2
1217/2005 <50 1,000 <50 <SO 55 0.3
3/9/2006 <SO 1,100 <SO <SO 52 0.2
6/14/2006 <SO 830 <SO <SO 52 0.2
712012006 <SO 2,170 <50 <SO 65 1.4
~~:;~~~ :;.~ ~~~-f.':'-';"'•~'-----1-------'~"'•~~-------'!;"-:l--------"-~.""-I~
6/27/2007 <1.0 300 <1.0 13 49 0.4
8/15/2007 <1.0 1,400 <1.0 36 57 1
10/10/2007 <1.0 2 000 <1.0 14 57 0.6
3/28/2008 <1.0 930 <1.0 40 49 0.1
6/25/2008 <1.0 1,300 <1.0 53 57 0.6
9/10/2008 <1.0 630 <1.0 24 44 0.2
10/15/2008 NA NA NA NA 64 0.1
11/18/2008 <2.0 1 700 <2.0 100 NA NA
3/4/2009 -~·1.0 950 <1.0 51 49
6/23/2009 <1.0 410 <1.0 12 48
9/14/2009 <1.0 850 <1.0 30 46
12114/2009 <1.0 1 100 <1.0 40 60
2/17/2010 <1.0 730 <1.0 19 57
6/14/2010 1.2 1,600 <1.0 <1.0 40
8/16/2010 <1.0 2,200 <1.0 21 49
10/15/2010 <1.0 970 <1.0 6.5 65
2/23/2011 <1.0 450 <1.0 3.6 57
5/31/2011 <1.0 1,800 <1.0 1.3 88
8/17/2011 <1.0 720 <1.0 7.2 58
11/16/2011 NA NA NA NA 69
0.4
0.2
0.1
2.3
0.2
6.8
0.6
0.7
0.5
0.4
0.9
2.0
(1) 12/5/2011 <1.0 1 800 <1.0 2.9 NA NA 1st Otr(2) 212112012 <1.0 ___ ~.~O_Ql-~'-'!.c.,·~c---_-_-_-_-_-+----------'"'15~=-----~9~9+=-'----------,-=1_7
2nd Qtr 6/6/2012 <1.0 -----3,000 <1.0 --------21 ---------73 2.5
3rd Qtr 9/4/2012 <1 3,100 <1 31 73 2.6
4th Qtr 10/4/2012 <1 1 200 <1 4 68 1.8
1stQtr 2/11/2013 <1 2,120 <1 9.34 81 .9 2.27
2nd Qtr 6/5/2013 <1.0 4,030 <1.0 52.4 77.9 2.11
3rd Qtr 9/3/2013 <1.0 2,940 <1.0 33.2 60.5 1.18
l--4"'th"-Q'c"'-tr __ ----'1-"0/"'2"'9"'/2"'0-'-13"+-<__,_1'-'.0'-------+------"1 __,_4,c10'-!-'<-'1~----+--------'4"c.0"'3'l-______ 7c,2.31------------'1-".3"'18 1st Qtr 1/27/2014 <1.0 1,400 <1.0 13.8 5ii:'4 0.55
2nd Qtr 5/19/2014 <1.0 1,960 <1.0 15.4 53.4 0.93
3rd Qtr 8/11/2014 <1.0 2,120 8.7 26 59 0.7
4th Qtr 10/21/2014 <1.0 2,090 <1.0 23.2 60.1 0.93
1stQtr 3/9/2015 <1.0 1,980 <1.0 27.4 56.5 0.73
2nd Qtr(3) ___ 6/8/2015 <,!:Q._________ __!.~8.Q c:::!.~------11.2 62 0.42
3rd Qtr 8/31/2015 <1.0 2,350 4.05 11.6 69.6 0.68
4th Qtr 10/19/2015 <1.0 2,680 1.32 8.28 62.6.,._ ______ ...,o~.9"'9"1,1
1st Qtr 3/9/2016 <1.0 2,650 <1.0 4.66 ""sii.":i 1.45
2nd Otr 5/23/2016 <1.0 -----! 2,220 <1.0 4.57 66.2 1.12
3rd Qtr 7/25/2016 <1.0 3,190 <1.0 7.81 66.4 1.57
4th Qtr(4) _ 10/1212016 <1.0 _________ _ 2,510C:::1.0 ______ ·------4.31 66.2 ~
1st Qtr 3/8/2017 <1.0 1,290 <1.0 7.65 58.4 ---------0.768
2nd Qtr 6/13/2017 <1.0 2,450 <1.0 7.59 64.3 0.922
3rd Qtr 7/26/2017 <1.0 1,230 <1.0 5.26 61.4 1.56
4thQtr 10/11/2017 <1.0 2 570 <1.0 7.83 62.2 1.18
1stQtr 3/1212018 <1.0 1,210 <1.0 2.14 60.3 1.57
2nd Qtr 6/8/2018 <1.0 1,870 <1.0 9.19 58.7 0.901
3rd Qtr 8/2212018 <1.0 1,680 <1.0 <1.0 91.4 2.80
4th Qtr 11/28/2018 <1 .0 1,480 <1.0 <1.0 85.5 1.96
1st.Qtr 3/8/2019 <1.0 1,110 <1.0 2.2 69.9 1.85
2nd Qtr 6/5/2019 <1.0 1,280 <1.0 1.19 80.7 2.83
3rd Qtr 9/4/2019 <1.0 1,680 <1.0 1.93 76.2 3.08
4th Qtr 12110/2019 <1.0 1 390 <1.0 1.78 83.2 0.977
1stQtr 2/19/2020 <1 .0 1,100 <1.0 <1.0 88.9 1.17
2nd Qtr 6/12/2020 <1.0 1,140 <1.0 <1.0 35.1 2.93
3rd Qtr 9/4/2020 <1 .0 1,130 <1.0 2.57 70 0.42
4th Qtr 10/28/2020 <1.0 866 <1.0 <1.0 37.4 3.62
1st Qtr 2123/2021 <1.0 3,060 <1.0 3.46 59.5 0.349
2nd Qtr 6/6/2021 <1.0 998 <1.0 <1.0 48.6 0.81
3rd Qtr 8/24/2021 <1.0 1,580 <1.0 <1.0 46.6 0.671
4th Qtr 1211/2021 <1.0 826 5.9 <1.0 84.7 0.52
1st Qtr 3/9/2022 <1.0 1,030 <1.0 <1.0 50.2 0.3
2nd Qtr 6/8/2022 <1.0 611 <1.0 <1.0 63.4 0.22
( 1) VOCs were resamp1ed because laboratory missed holding time
(21 As of March 2012 both north and south wild life ponds no lonjler receIvI~ water
(3) chloroform .e.umpmi. well TW4-37 started m 6/9/15 __________ ,
j4J chloroform,e_umpma_ wells TW4-1 1W4-2, and 1W4-11 started m 1/14/15 __
NA = not analyzed
Shaded md1cates concentrations exceeding GWQS.
Bold and italics indicates the MDL exceeded the GWQS.
TABLE 1 (3 of 33)
Historic Summary Of Monitoring Well Analytical Results Up To The 2nd Quarter 2022
Chloroform Contamination Investigation
DUSA White Mesa Mill
MW•32 (form« TW4•17) Parameter
Sampling Event IGWQSI
Carbon Tetrachloride Chloroform Chloromethane Methylene Chloride
(5 µg/LI 170 uo/U 130 ua/U 15 un/U
1stQtr 3/16/2005 NA <1.0 NA NA
12nd Qtr 5125/2005 NA <1.0 NA NA
l3rdQtr 8/31/2005 <1.0 <1.0 3.2 <1.0
:rtr
12/7/2005 <1.0 <1.0 <1.0 <1.0
Qtr 3/9/2006 <1.0 <1.0 <1.0 <1.0
Qtr 6/14/2006 <1.0 <1.0 3.5 <1.0
Qtr 7/20/2006 <1.0 <1.0 1.8 <1.0
14th Qtr 11/8/2006 <1.0 <1.0 1.5 <1.0
1stQtr 2/28/2007 . <1.0 <1.0 <1.0 <1.0
12nd Qtr 6/27/2007 <1.0 <1.0 <1.0 <1.0
l3rdQtr 8/15/2007 <1.0 <1.0 <1.0 <1.0
14thQtr 10/10/2007 <1.0 <1.0 <1.0 <1.0
1stQtr 3/28/2008 <1.0 <1.0 <1.0 <1 .0
12nd Qtr 6/25/2008 <1.0 <1.0 <1.0 <1.0
13rdQtr 9/10/2008 <1.0 <1.0 <1.0 <1.0
!4th_Qtr 10/15/2008 <1.0 <1.0 <1.0 <1.0
1stQtr 3/4/2009 <1.0 <1.0 <1.0 <1.0
12nd Qtr 6/23/2009 <1.0 <1.0 <1.0 <1.0
13rdQtr 9/14/2009 <1.0 <1.0 <1.0 <1.0
4th Qtr 12/16/2009 <1.0 <1.0 <1.0 <1.0
1stQtr 2/17/2010 <1.0 <1.0 <1.0 <1 .0
2nd Qtr 6/14/2010 <1.0 <1.0 <1.0 <1.0
3rdQtr 8/16/2010 <1.0 <1.0 <1.0 <1.0 ··-"" 10/15/2010 <1.0 <1.0 <1.0 <1.0
1stQtr 2/23/2011 <1.0 <1.0 <1.0 <1.0
2ndQtr 5/25/2011 <1.0 <1.0 <1.0 <1.0
3rd Qtr 8/18/2011 <1.0 <1.0 <1.0 <1.0
4th Qtr 11/16/2011 NA NA NA NA
(11 12/7/2011 <1.0 <1.0 <1.0 <1.b
<1.0 <1.0 <1.0 <1.0 1st Citr (2) 1/18/2012
2nd Qtr --6/22/2012 <1.0 --1--------f----------<1.0 -<1.0
3rd Qtr 9/5/2012 <1.0 <1.0
4th Qtr 10/10/2012 <1.0 <1.0
1stQtr 2/11/2013 . <1.0 <1.0
2nd Qtr 6/18/2013 <1.0 <1.0
3rdQtr 9/3/2013 <1.0 <1.0
4thQtr 10/29/2013 <1.0 <1.0
1stQtr 1/29/201.4 . <1.0 <1.0
2ndQtr 5/23/2014 <1.0 -<1.0
3rd Qtr 8/26/2014 <1.0 <1.0
4th Qtr 10/29/2014 <1.0 <1.0
1stQtr 3/17/2015 <1.0 <1.0
2ndQtr 6/11/2015 <1.0 <1.0
3rd Qtr 9/9/2015 <1.0 <1.0
4th Qtr 10/28/2015 <1,0 <1.0
1stQtr 3/22/2016 <1.0 <1.0
Duplicate TW4-70 <1.0 <1.0
2ndQtr 6/8/2016 <1.0 <1.0
Duplicate TW4-70 <1.0 <1.0
3rd Qtr 8/19/2016 ~ <1.0
4th Qtr 10/31/2016 <1.0 <1.0
1stQtr 3/21/2017 <1.0 <1.0
2ndQtr 6/21/2017 <1.0 <1.0
3rd Qtr 8/8/2017 <1.0 <1.0
4th Qtr 10/12/2017 <1.0 <1.0
1stQtr 3/15/2018 <1.0 <1.0
Duplicate lW4-70 <1.0 <1.0
2nd Qtr 6/14/2018 <1.0 <1.0
3rdQtr 9/22/2018 <1.0 <1.0
4thQtr 10/29/2018 <1.0 <1.0
1stQtr 3/19/2019 <1 .0 <1.0
2nd Qtr 6/18/2019 <1 .0 <1.0
3rd Qtr 9/1 1/2019 <1 .0 <1.0
4thQtr 12/18/2019 <1 .0 <1.0
1stQtr 3/18/2020 <1.0 <1.0
Duplicate lW4-75 <1 .0 <1.0
2nd Qtr 6/12/2020 <1.0 <1.0
3rdQtr 9/18/2020 <1.0 <1.0
4thQtr 11/4/2020 <1.0 <1.0
Du licate lW+65 <1.0 <1.0
·1·stQtr 3/18/2020 <1.0 <1.0
Duplicate lW4-75 <1.0 <1.0
2nd Qtr 6/17/2021 <1 .0 <1.0
Duplicate lW4-75 <1.0 <1.0
3rdQtr 9/23/2021 <1.0 <1.0
Duplicate lW4-75 <1 .0 <1.0
4thQtr 12/9/2021 <1.0 <1.0
1stQtr 3/22/2022 <1.0 <1.0
2nd Qtr 6/16/2022 <1 .0 <1.0
(1) voes were resampled because laboratory missed holding time
(21 As of March 2012 both north and south wild life ponds no longer receJV1ng 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
<1.0 <1.0
<1.0 <1.0
<1.0 <1.0
<1.0 <1.0
<1.0 <1.0
<1.0 <1.0
<1.0 <1.0
<1.0 <1.0
<1.0 <1.0
<1.0 <1.0
<1.0 <1.0
<1.0 <1.0
<1.0 <1.0
<1.0 <1.0
<1.0 <1.0
<1.0 <1:0
<1.0 <1.0
<1.0 <1.0
<1.0 <1.0
<1.0 <1.0
<1.0 <1.0
<1.0 <1.0
Chloride Nitrate, Nitrate + Nitrite
No GWQS lmo/U 110 mn/U
NA <0.1
NA <0.1
NA <0.1
33 <0.1
32 <0.1
30 <0.1
32 <1.0
31 <.1
32 <1.0
32 <1.0
31 <1.0
32 <1.0
31 <.1
29 <1.0
30 <1.0
26 <0.05
30 <.1
31 <0.1
33 <0.1
35 <0.1
38 <0.1
32 <0.1
28 <0.1
24 <0.1
40 <0.1
31 <0.1
33 <0.1
32 <0.1
NA NA
21 <0.1 ---------32 <0.1 ---------
33 <0.1
35 <0.1
34:·3 <0.1
34.9 <0.1
33 <0.1
35.7 <0.1
34 <0.1
39.7 <0.1
34 <0.1
34.9 <0.1
36.3 <0.1
35.8 <0.1
37.7 <0.1
34.7 <0.1
36.7 ~0.1
37.7 0.119
36.4 <0.1
37.7 <0.1
35.7 <0.1
36.9 <0.1
33.7 <0.1
37.2 <0.1
38.1 <0.1
32.6 <0.1
39.4 <0.1
39.3 <0.1
34.4 <0.1
41.2 <0.1
32.9 <0.1
35.3 <0.1
36.5 <0.1
41.2 <0.1
36.3 <0.1
36 <0.1
34.8 <0.1
35.6 <0.1
34.7 <0.1
31.3 <0.1
35.9 <0.1
36.8 <0.1
37.4 <0.1
35.8 <0.1
34.3 <0.1
35.3 <0.1
35.5 <0.1
35.8 <0.1
28.6 <0.1
26.9 <0.1
TABLE 1 (4 of 33)
Historic Summary Of Monitoring Well Analytical Results Up To The 2nd Quarter 2022
Chloroform Contamination Investigation
DUSA White Mesa Mill
TW4-1 (chloroform pomping -11
$larted in1/14115) Parameter
Sampling Event (GWQSl
Carbon Tetrachloride Chloroform Chloromethane Methylene Chloride Chloride
15 ua/Ll 170 uo/Ll 130 ua/Ll 15 ua/Ll No GWQS lma/Ll
1st0tr 3/16/2005 NA 2,700 NA NA NA
2nd Qtr 5/25/2005 NA 3,080 NA NA NA
3rd Qtr 8/31/2005 <10 2,900 <10 <10 NA
4thQtr 1217/2005 <50 2,400 <50 <50 52
1stQtr 3/9/2006 <50 2,700 <50 <50 49
2ndQtr 6/14/2006 <50 2,200 <50 <50 48
3rd Qtr 7/20/2006 <50 2,840 <50 <50 51
4thQtr 11/8/2006 1.4 2,260 <1 .0 <1.0 47
1stQtr 2/28/2007 1.2 1,900 <1 .0 <1.0 47
2ndQtr 6/27/2007 1.4 1,900 <1.0 <1.0 45
3rd Qtr 8/15/2007 1.3 2,300 <1.0 <1.0 43
4thQtr 10/10/2007 1.3 2 000 <1.0 <1.0 43
1stQtr 3/28/2008 1.3 2,000 <1 .0 <1.0 39
2ndQtr 6/25/2008 1.1 1,900 <1.0 <1.0 39
3rd Qtr 9/10/2008 1.3 1,700 <1.0 <1.0 35
4th Qtr 10/15/2008 1.3 1 700 <1.0 <1.0 41
1stQtr 3/11/2009 1.1 1,700 <1.0 <1.0 37
2ndQtr 6/23/2009 1 1,500 <1.0 <1.0 37
3rdQtr 9/14/2009 <1.0 1,700 <1.0 <1.0 36
4th Qtr 12/29/2009 <1.0 1,400 -~.1-0 <1.0 41
1stQtr 3/3/2010 <1.0 1,300 <1.0 <1.0 35
2nd Qtr 6/14/2010 1.2 1,600 <1.0 <1.0 40
3rdQtr 8/18/2010 1 1,600 <1.0 <1.0 35
4thQtr 10/15/2010 <1.0 1 500 <1.0 <1.0 40
1stQtr 2/24/2011 -~i.o 1,300 <1.0 <1.0 41
2nd Qtr 6/1/2011 <1.0 1,200 <1.0 <1.0 35
3rd Qtr 8/18/2011 <1.0 1,300 <1.0 <1.0 36
4thQtr 11/29/201.1_ _ <1.0 1 500 <1.0 <1.0 40
lsfCifr"fi) 112412012 <1.0 1,300 <1.0 <1.0 38
2nd Qtr ---6/14/2012 <1.0 -------,.□oo 1------------------42 <1.0 <1.0
3rd Qtr 9/28/2012 <1.0 1,000 <1.0 <1.0 39
4th Qtr 10/4/2012 <1.0 1,100 <1.0 <1.0 40
1stQtr 2/13/2013 3.66 1,320 <1.0 <1.0 37.6
2nd Qtr 6/19/2013 <1.0 1,100 <1.0 <1.0 39.1
3rd Qtr 9/3/2013 <1.0 1,150 <1.0 <1.0 37.6
4th Qtr 11/14/2013 <1.0 1 280 <1.0 <1.0 36.5
1stQtr 2/5/2014 5.47 1,090 <1.0 <1.0 38.9
2ndQtr 5/23/2014 4.77 1,020 <1.0 <1.0 37.4
3rd Qtr 8/27/2014 <1.0 845 1.4 <1.0 38
4th Qtr ___ 10/29/2014 <1.0 ---------___ .!_.1_4_Q <1.0 1---------<1.0 --------________ 38.7
1stQtr12l 3/9/2015 <1.0 1,130 <1.0 <1.0 38.3
2ndQtr 6/8/2015 <1.0 1,260 <1.0 <1.0 40.3
3rd Qtr 8/31/2015 <1.0 1,060 <1.0 <1.0 45.9
4thQtr 10/19/2015 <1.0 1,040 <1.0 <_!.0 38.5
1stQtr 3/9/2016 <1.0 974 ~1.0 <1.0 41.7
2ndQtr 5/23/2016 <1.0 1,140 <1.0 <1.0 44.4
3rd Qtr 7/25/2016 <1.0 1,160 <1.0 <1.0 44.7
4th Qtr 10/13/2016 <1.0 1 330 <1.0 <1.0 44.2
1stQtr 3/8/2017 <1.0 519 <1.0 <1.0 41.5
2ndQtr 6/13/2017 <1.0 977 <1.0 <1.0 41.8
3rd Qtr 7/26/2017 <1.0 958 <1.0 <1.0 42.8
4th Qtr 10/11/2017 <1.0 556 <1.0 <1.0 38.5
~';:~ /~' "~ S,,mo,e <7.6 810 <12 ___ 23 ___ J 42
<1.0 70.4 <1.0 <1.0 45.8
2nd Qtr ----6/8/2018 <1.0 ----1----------------<1.0 --------42.0 942 <1.0
3rd Qtr 8/22/2018 <1.0 1,010 <1.0 <1.0 47.3
4th Qtr 10/22/2018 <1.0 752 <1.0 <1.0 43.2
DWMRC s lit samole <5.0 210 <5.0 <5.0 NA
1stQtr 3/8/2019 <1.0 87.2 <1.0 <1.0 40.9
2nd Qtr 6/5/2019 <1.0 1,040 <1.0 <1.0 44.8
3rdQtr 9/4/2019 <1.0 894 <1.0 <1.0 46
12/10/2019 <1.0 1,070 <1.0 <1.0 44.2 4thQtr --~ ...... i,i-otr 2/19/2020 <1.0 1,190 <1.0
2nd Qtr 5/27/2020 <1.0 499 <1.0
3rdQtr 9/4/2020 <1.0 1,060 <1.0
l4th_Qtr 10/28/2020 <1.0 924 <1.0
1stQtr 2/23/2021 <1.0 948 <1.0
12nd Qtr 6/9/2021 <1.0 957 <1.0
l3rdQtr 8/24/2021 <1.0 821
12/1/2021 <1.0 957 <1.0
3/9/2022 <1.0 946 <1.0
r fi/Al?n22 <1.0 914 <1.0
(1) As of March 2012 bolh north and south wild hfe ponds no lon,1er receM!!iJ water
(2) TW4-1 converted to a chloroform pu~lf\Q)Yell started in 1/1,4/15 .i~ chloroform .e,umpini, well TW4-41 started m May 2018 __ .
NA = not analyzed
Shaded indicates concentrations exceeding GWQS.
Sold and italics indicates the MDL exceeded the GWOS.
J = Approximated value
<1.0 47.5
<1.0 46.4
<1.0 43.7
<1.0 41.9
<1.0 45.4
<1.0 37.2
1.18 <1.0 44.8
<1.0 45.5
<1.0 42.6
<1.0 45.5
Nitrate, Nitrate + Nitrite
110mn/Ll
9.1
10.6
9.8
9.7
9.4
9.6
9.2
8.9
9
8.4
7.8
7.6
8.68
8.15
9.3
7.5
6.9
7.3
6.8 7_"i
6.8
6.7
6.6
6.6
6.6
6.8
6.6
6.8
7.1
5.0
6.5
6.99
6.87
7.12
7.08
7.74
6.93
4.80
----------6.31 7.06
6.07
6.28
1.55
0.148
0.138
5.49
0.746
4.44
5.74
5.04
5.78
0.17
4.84
4.38
4.30
4.57
0.46
4.51
1.43
1.65
3.91
4.67
0.44
2.22
4.30
2.72
0.73
1.38
4.37
3.90
0.18
TABLE 1 (5 of 33)
Historic Summary Of Monitoring Well Analytical Results Up To The 2nd Quarter 2022
Chloroform Contamination Investigation
OUSA Whrte Mesa Mill
TW4-2 (chloroform pumping well
IWting 1114/15)
Sampling Event
Carbon Tetrachloride Chloroform Chloromethane
15 ua/LI 170 ua/LI 130 ua/LI
1stQtr 3/16/2005 NA 3.700 NA
2ndQtr 5125/2005 NA 3.750 NA
3rd Qtr 8/3112005 <10 3,900 <10
4th Qtr 12/7/2005 <50 3.500 <50
1st0tr 319/2006 <50 3.800 <50
2ndQtr 6/1412006 <50 3,200 <50
3rd Qtr 7120/2006 <50 4,120 <50
4thQtr 1118/2006 2.3 3 420 <1.0
1stQtr 2/28/2007 1.8 2,300 <1.0
2ndQtr 6/27/2007 2.5 3.000 <1.0
3rd Qtr 811512007 2.2 340 <1.0
4th Qtr 10/1012007 2.1 3200 <1.0
1stQtr 3/28/2008 23" 3,300 <1.0
2ndQtr 6/25/2008 2.2 3.100 <1.0
3rd Qtr 9/1012008 2.4 2,800 <1.0
4thQtr 1011512008 NA #NIA NA
11/18/2008 2.4 3.200 <2.0
1stQtr 3/11/2009 2.2 3,100 <1.0
2ndQtr 6/23/2009 2 2.800 <1.0
3rd Qtr 911412009 2 3,000 <1.0
4th Qtr 12/29/2009 2 1600 <1.0
1stQtr 31312010 2 2.600 <1.0
2ndQtr 6114/2010 2.6 3,300 <1.0
3rd Qtr 8/1812010 2.5 3.300 <1.0
4thQtr 1011512010 2.1 3,000 <1.0
1stQtr 2/24/2011 2.4 3,100 <1.0
2nd Qtr 612/2011 22 3,000 <1.0
3rd Qtr 8117/2011 1.6 2.400 <1.0
4thQtr 11/2912011 2.8 3 900 <1.0
1st Otr (2) 112412012 2 2,500 <1.0
2nd Qtr ---6/1412012 2.1 ._ ___ 2.500 ~1.0
3rdQtr 9/4/2012 1.8 2.900 <1.0
4th Qtr 1014/2012 2 3100 <1.0
1stQtr 2/13/2013 5.17 3,580 <1.0
2nd Qtr 611912013 2.65 3,110 2
3rdQtr 9/3/2013 2.41 3,480 <1.0
4th Qtr 1111412013 3.15 3 740 <1.0
1stQtr 2/612014 7.1 3,180 <1.0
2ndQtr 512312014 6.05 2,930 <1.0
3rd Qtr 8/2712014 1.4 3,170 3.6
4th Qtr 10/30/2014 <1.0 ---------2.6 ._ ___ ~-i8.2
1st Qtr (2) 3/912015 1.44 1,840 <:ro------
2ndQtr 6/812015 <1.0 1,650 <1.0
3rd Qtr 8/3112015 <1.0 1,060
4th Qtr 10/1912015 ... 2.6 2 070 <1.0
1stQtr 3/912016 1.2 1,970 ~-1~0
2ndQtr 5/2312016 1.49 2,070 <1.0
3rd Qtr 7/2512016 <1 .0 1,780 <1.0
4th Qtr 10/12/2016 <1.0 1600 <1.0
1st0tr 318/2017 <1.0 1,570 <1.0
2ndQtr 6/1312017 <1.0 1.940 <1.0
3rd Qtr 7/2612017 <1.0 1,310 <1.0
4th Qtr 1011112017 <1.0 1,610 <1.0
DWMRC split sample <19 1,200 <30
pWMRC du licate TW4-50 <19 1200 <30
1stQtr 3/12/2018 <1.0 764 <1.0
2ndQtr 6/812018 <1.0 949 <1.0
3rd Qtr 8/2212018 <1.0 980 <1.0
4th Qtr 1012212018 <1.0 822 <1.0
1st0tr 31812019 <1.0 1,040 <1.0
2ndQtr 61512019 <1.0 1.360 <1.0
3rdQtr 91412019 <1.0 797 <1.0
4thQtr 12/10/2019 <1.0 934 <1.0
1stQtr 2/1912020 <1.0 1,880 <1.0
2nd Qtr 6110/2020 <1.0 1,070 <1.0
3rdQtr 914/2020 <1.0 1,260 <1.0
4th Qtr 10128/2020 <1.0 1130 <1.0
1stQtr 2/23/2021 <1.0 939 <1.0
2nd Qtr 61912021 <1.0 1,160 <1.0
3rdQtr 812412021 <1.0 1,150 <1.0
4th Qtr 12/112021 <1.0 852 <1.0
1stQtr 3117/2022 <1.0 1,020 <1.0
2ndQtr 61812022 <1.0 892 <1.0
{1) As of March 2012 both north and south wild life ponds no loni.er recerv1~ wate_r
(2) TW4-2 and 'TW4-11 converted to a chloroform pu~mg;:ven started m 1/14/15,
NA and #N/A(for graph use)= not analyzed
Shaded indicates concentrations exceedmg GWOS.
Bold and italics indicates the MDL exceeded the GWQS.
J = Approximated value
2.6
Parameter
IGWQS)
Methylene Chloride
f5ua/Ll
NA
NA
<10
<50
<50
<50
<50
<1.0
<1.0
<1.0
<1.0
<1 .0
<1 .0
<1.0
<1.0
NA
<2.0
<1.0
<1 .0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0 -
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0 <1.0 --------
<1 .0
<1 .0
<1.0
<1.0
<1 .0
<1.0
<1 .0
<1.0
<1.0
<1.0
<1.0
68 J
60 J
<1 .0
<1.0
<1 .0
<1 .0
<1.0
<1 .0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
Chloride
No GWQS fma/Ll.
NA
NA
NA
56
56
56
54
55
54
50
49
51
48
46
42
47
NA
46
44
43
46
42
43
43
41
46
42
48
49
49 ---------52
76
49
46
46.9
44.9
43.9
4s:s
45.4
45
45.5
44.9
48.1
50
41.9
43.4
43.8
42.9
44.3
43.1
43.6
43.2
43.5
44
43
44.4
41.3
44.3
41.7
40.4
39.8
40.8
41.5 42··;
40.6
41.3
38.7
43.3
32.5
36.8
41.9
36.7
39.5
Nitrate, Nitrate + Nitrite
110 ma/Ll
7.7
8.6
8.0
7.8
7.5
7.1
7.4
7.6
7.3
7.8
7.3
6.9
6.9
7.4
7.1
8.0
#NIA
6.5
6.4
6.6
6.4
6.8
8.7
6.6
6.5
7.0
6.8
6.0
7.0
7.1
7.7
4.0
7.6
8.1
7.51
9.3
8.39
7.87
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
3.30
3.89
1.97
3.49
3.3
3.1
TW4--3
Sampling Event
TABLE 1 (6 of 33)
Historic Summary Of Monitoring Well Analytical Results Up To The 2nd Quarter 2022
Chloroform Contamination Investigation
DUSA White Mesa Mill
Parameter
IGWQSl
Carbon Tetrachloride Chloroform Chloromethane Methylene Chloride Chloride
15"ft", 170 "ft"' /30uftff \ 15 ua/Ll No GWQS lma/Ll
1stQtr 3/16/2005 NA <1.0 NA NA NA
2ndQtr 5/25/2005 NA <1.0 NA NA NA
3rd Qtr 8/31/2005 <1.0 <1.0 6.4 <1.0 NA
4thQtr 1217/2005 .. <1.0 <1.0 <1.0 <1.0 26
1stQtr 3/9/2006 <1.0 <1.0 2.3 <1.0 26
2ndQtr 6/14/2006 <1.0 <1.0 1.6 <1.0 26
3rdQtr 7/20/2006 <1.0 <1.0 2.2 <1.0 26
4thQtr 11/8/2006 <1.0 <1.0 <1.0 <1.0 23
1stQtr 2/28/2007 <1.0 <1.0 <1.0 <1.0 22
2ndQtr 6127/2007 <1.0 <1.0 <1.0 <1.0 23
3rd Qtr 8/15/2007 <1.0 <1.0 <1.0 <1.0 24
4thQtr 10/10/2007 <1.0 <1.0 <1.0 <1.0 27 ........................... 1stQtr 3/28/2008 <1.0 <1.0 <1.0 <1.0 21
2ndQtr 6/25/2008 <1.0 <1.0 <1.0 <1.0 19
3rd Qtr 9/10/2008 <1.0 <1.0 <1.0 <1.0 19
4th Qtr 10/15/2008 <1.0 <1.0 <1.0 <1.0 22
1stQtr 3/4/2009 <1.0 <1.0 <1.0 <1.0 2i
2ndQtr 6/23/2009 <1.0 <1.0 <1.0 <1.0 20
3rd Qtr 9/14/2009 <1.0 <1.0 <1.0 <1.0 21
4th Qtr 12/29/2009 <1.0 <1.0 <1.0 <1.0 22
1stQtr 2/23/2010 <1.0 <1.0 <1.0 <1.0 23
2ndQtr 6/14/2010 <1.0 <1.0 <1.0 <1.0 24
3rdQtr 8/10/2010 <1.0 <1.0 <1.0 <1.0 22
4thQtr 10/15/2010 <1.0 <1.0 <1.0 <1.0 26
1stQtr 2/15/2011 ·•·i.o <1.0 <1.0 <1.0 :fa
2ndQtr 5/25/2011 <1.0 <1.0 <1.0 <1.0 23
3rd Qtr 8/17/2011 <1.0 <1.0 <1.0 <1.0 23
4thQtr 11/14/2011 <1.0 <1.0 <1.0 <1.0 23
1st Otr (2) 1/17/2012 <1.0 <1.0 i.:;1.0 ------<1.0 :H
2nd Qtr ---5/31/2012 ----------------<1.0 <1.0 <1.0 <1.0 24
3rdQtr 8/28/2012 <1.0 <1.0 <1.0 <1.0 25
4th Qtr 10/3/2012 <1.0 <1.0 <1.0 <1.0 25
1st Qtr 217/2013 <1.0 <1.0 <1.0 <1.0 2S:1
2ndQtr 6/28/2013 <1.0 <1.0 <1.0 <1.0 23.8
3rd Qtr 9/3/2013 <1.0 <1.0 <1.0 <1.0 25
4thQtr 11/8/2013 <1.0 <1.0 <1.0 <1.0 24.1
1stQtr 1/22/2014 <1.0 <1.0 <1.0 <1.0 24.9
2ndQtr 5/21/2014 <1.0 <1.0 <1.0 <1.0 24.4
3rd Qtr 8/13/2014 <1.0 <1.0 <1.0 <1.0 26
4thQtr 10/23/2014 <1.0 <1.0 <1.0 <1.0 26.7
1stQtr 3/11/2015 <1.0 <1.0 ·•i'.o <1.0 26.2
2ndQtr 6/10/2015 <1.0 <1.0 <1.0 <1.0 27.5
Duplicate TW4-65 <1.0 <1.0 <1.0 <1.0 27.5
3rd Qtr 8/13/2015 <1.0 <1.0 <1.0 <1.0 27.4
4thQtr 10/21/2015 <1.0 <1.0 <1.0 <1.0 25.6
1stQtr 3/15/2016 <1.0 <1.0 <1.0 <1.0 32.8
2ndQtr 5/25/2016 <1.0 <1.0 <1.0 <1.0 27.9
3rdQtr 7/27/2016 <1.0 <1.0 <1.0 <1.0 26.5
4thQtr 10/19/2016 <1.0 <1.0 <1.0 <1.0 29.5
1stQtr 3/14/2017 <1.0 <1.0 <1.0 <1.0 28.1
2ndQtr 6/14/2017 <1.0 <1.0 <1.0 <1.0 28.7
3rdQtr 7/27/2017 <1.0 <1.0 <1.0 <1.0 28.5
Duplicate TW4-65 <1.0 <1.0 <1.0 <1.0 28.9
14th Qtr 10/11/2017 <1.0 <1.0 <1.0 <1.0 25.9
1st Qtr 3/14/2018 <1.0 <1.0 <1.0 <1.0 29.8
Duplicate TW4-65 <1.0 <1.0 <1.0 <1.0 29.5
I2ndQtr 6/8/2018 <1.0 <1.0 <1.0 <1.0 26.1
3rd Qtr 8/29/2018 <1.0 <1.0 <1.0 <1.0 31.0
Duplicate TW4-65 <1.0 <1.0 <1.0 <1.0 31.0
14th Qtr 11/30/2018 <1.0 <1.0 <1.0 <1.0 27.4
Duplicate TW4-65 <1.0 <1.0 <1.0 <1.0 26.2
1stQtr 3/13/2019 <1.0 <1.0 <1.0 <1.0 25.5
2ndQtr 6/13/2019 <1.0 <1.0 <1.0 <1.0 27.4
Duplicate TW4-65 <1.0 <1.0 <1.0 <1.0 25.9
3rdQtr 9/11/2019 <1.0 <1.0 <1.0 <1.0 26.0
Duplicate TW4-65 <1.0 <1.0 <1.0 <1.0 22.1
4thQtr 12/12/2019 <1.0 <1.0 <1.0 <1.0 28 ................ 'i'stotr ...... 3/17/2020 <1.0 <1.0 <1.0 <1.0 27.7
DupJicate TW4-65 <1.0, <1.0 <1.0 <1.0 26
2ndQtr 6/10/2020 <1.0 <1.0 <1.0 <1.0 26.2
Duplicate TW4-65 <1.0 <1.0 <1.0 <1.0 26.7
3rdQtr 9/17/2020 <1.0 <1.0 <1.0 <1.0 25.9
~th_Qtr ...................... 11/4/2020, <1.0 <1.0 <1.0 <1.0 24.9
1stQtr 3/17/2021 <1.0 <1.0 <1.0 <1.0 28.4
Duplicate TW4-65 <1.0 <1.0 <1.0 <1.0 27.6
2ndQtr 6/15/2021 <1.0 <1.0 <1.0 <1.0 27
Oupllcate TW4-65 <1.0 <1.0 <1.0 <1.0 23.9
3rd Qtr 9/15/2021 <1.0 <1.0 <1.0 <1.0 20.3
Duplicate TW4-65 <1.0 <1.0 <1.0 <1.0 20.7
4th Qtr 1217/2021 <1.0 <1,0 <1.0 <1.0 26.2
Dupllcate_TW4-65 ,<1.0 <1.0 <1.0 <1.0 26.4
1stQtr 3/15/2022 <1.0 <1.0 <1.0 <1.0 24.3
2ndQtr 6/15/2022 <1.0 <1.0 <1.0 <1.0 26.7
NA = not analyzed Shaded indicates cont:entrati0n1 exceeding GWQS.
Nitrate, Nitrate + Nitrite
I10mnn'
3.5
3.7
3.5
3.3
3.3
7.1
2.9
1.5 :3i
3.3
3.1
2.8 28
2.9
2.7
2.6
2.5
2.9
2.8
2.6
2.8
3.0
3.1
3.3
3.5
3.7
4.0
4.4 ii
4.4
4.9
4.8
5.05
5.83
4.90
5.89
6.66
6.01
5.30
6.07
6.64
5.71
3.94
3.88
5.37
5.83
5.65
6.10
6.00
6.18
6.36
6.36
6.24
6.32
6.48
6.31
6.52
5.53
5.44
5.85
5.77
5.82
6.68
6.60
5.12
5.76
5.91
6.15
6.38
6.53
6.63
6.36
6.02
6.19
6.64
8.04
7.89
5.28
6.19
5.97
6.55
6.1
5.8
TABLE 1 (7 of 33)
Historic Summary Of Monitoring Well Analytical Results Up To The 2nd Quarter 2022
Chloroform Contamination Investigation
DUSA White Mesa Mill
TW4-4 (chloroform pymping well
stared ln1stqtr2010)
Sampling Event
Carbon Tetrachloride Chloroform Chloromethane
I5ua/Ll 170 ua/Ll 130 ua/Ll
1stQtr 3/16/2005 NA 3,100 NA
2ndQtr 5/25/2005 NA 2,400 NA
3rd Qtr 8/31/2005 <10 3,200 <10
4th Qtr 1217/2005 <50 2,800 <50
1stQtr 3/9/2006 <50 2,900 <50
2ndQtr 6/14/2006 <50 2,600 <50
3rd Qtr 7/20/2006 <50 2,850 <50
4th Qtr 11/8/2006 1.7 2,670 <1.0
1stQtr 2/28/2007 1.5 2,200 <1.0
2ndQtr 6/27/2007 1.7 2,400 <1.0
3rd Qtr 8/15/2007 1.5 2,700 <1.0
4th Qtr 10/10/2007 1.5 2 500 <1.0
1stQtr 3/28/2008 1.6 2,800 <1.0
2nd Qtr 6/25/2008 1.5 2,500 <1.0
3rdQtr 9/10/2008 1.4 2,200 <1.0
4th Qtr 10/15/2008 NA #N/A NA
1stQtr 11/18/2008 <2.0 2,500 <2.0
1stQtr 3/4/2009 1.2 2,200 <1.0
2nd Qtr 6/23/2009 1.2 1,800 <1.0
3rd Qtr 9/14/2009 1.1 2,000 <1.0
4th Qtr 12/29/2009 1.1 950 <1.0
1st Qtr (2) 2/17/2010 ----------1 >----1,700 <1.0 ______
2nd Qtr 6/14/2010 1.2 1,700 <1.0
3rdQtr 8/10/2010 1.3 2,100 <1.0
4thQtr 10/15/2010 1.3 1 700 <1.0
1stQtr 2/23/2011. 1.4 1,800 <1.0
2ndQtr 6/1/2011 1.2 1,700 <1.0
3rd Qtr 8/17/2011 <1.0 1,500 <1.0
4th Qtr 11/16/2011 1 1,500 <1.0
1st Ctr (1) 1/23/2012 <1.0 1,200 <1.0 1--------<1.0 ______
2nd Qtr 6/6/2012 <1.0 1,500
3rdQtr 9/4/2012 1.2 1,600 <1.0
4th Qtr 10/3/2012 1 1,400 <1.0
1stQtr 2/11/2013 1 1,460 <1.0
2nd Qtr 6/29/2013 <1.0 1,330 <1.0
3rdQtr 9/3/2013 1.2 1,380 <1.0
4thQtr 10/23/2013 5.3 1 360 <1.0
1stQtr 1/27/2014 3.88 1,260 <1.0
2nd Qtr 5/19/2014 4.94 1,220 <1.0
3rdQtr 8/11/2014 4.94 1,320 7.1
4th Qtr 10/21/2014 <1.0 ---------1,130 <1.0
1st Qtr (4) ---3/9/2015 1--------<'i:o ______
1.05 1,350
2nd Qtr 6/10/2015 <1.0 1,280 <1.0
3rdQtr 8/31/2015 <1.0 1,220 1.72
4thQtr 10/19/2015 <1.0 1,190 <1.0 --------1stQtr 3/9/2016 <1.0 1,190 <1.0
2nd Qtr 5/23/2016 --1_1.1 1,780 <1.0
3rd Qtr 7/27/2016 <1.0 1,380 <1.0
4th Qtr 10/13/2016 <1.0 1 430 <1.0
1stQtr 3/8/2017 <1.0 1,290 <1.0
2ndQtr 6/13/2017 <1.0 1,290 <1.0
3rdQtr 7/26/2017 <1 .0 1,290 <1.0
4th Qtr 10/11/2017 <1.0 1,120 <1.0
1stQtr 3/12/2018 <1.0 1,160 <1.0
2ndQtr (3) 6/8/2018 <1.0 ------>----1,050 <1.0 ______
3rdQtr 8/22/2018 <1.0 1,030 <1.0
4thQtr 11/28/2018 <1.0 1,140 <1.0
1stQtr 3/8/2019 <1.0 1,050 <1.0
2nd Qtr 6/5/2019 <1.0 1,070 <1.0
3rdQtr 9/4/2019 <1.0 989 <1.0
4thQtr 12/10/2019 <1.0 1140 <1.0
1stQtr 2/19/2020 <1.0 1,100 <1.0
2nd Qtr 5/27/2020 <1.0 1,140 <1.0
3rdQtr 9/4/2020 <1 .0 1,110 <1.0
4thQtr 10/28/2020 <1.0 979 <1.0
1stQtr 2/23/2021 <1.0 1,130 <1.0
2nd Qtr 6/9/2021 <1.0 1,240 <1.0
3rd Qtr 8/24/2021 <1.0 1,100 <1.0
4th Qtr 12/1/2021 <1.0 950 <1.0
1stQtr 3/9/2022 <1.0 1,010 <1.0
2ndQtr 6/8/2022 <1.0 1110 <1.0
(1) As of March 2012 both north and south wild hfe ,e_onds no ton,1er recerv't.!!9 water
(2) 1W4-4 converted to a Chloroform pu~P}'l!l,_Well stared In 1st.9.tr 2010 __ -·
j,3) 1W4-41 Installed as a Chloroform etTP)"a,_well stared m Mal,2018 ___ _ J.41. TW4-2 converted to a chlorofor"\P};H~~y,-ell started m 1/14/15 ____ -·
NA and #N/A(for graph use) = not analyzed
Shaded indicates concentrations exceeding GWQS.
Bold and italics indicates the MDL exceeded the GWOS.
Parameter
IGWQSl
Methylene Chloride
15 ua/Ll
NA
NA
<10
<50
<50
<50
<50
<1 .0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
NA
<2.0
<1.0
<1.0
<1.0
<1.0 <1.0 --------
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0 <1.0 --------
<1.0
<1.0
~_1.0 --------<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0 <1.0 --------
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
Chloride
No GWQS lma/Ll
NA
NA
NA
54
51
48
50
49
49
47
45
47
43
42
39
44
NA
37
34
39
41 ---------48
35
36
38
41
35
40
39 :is ----43
39
38
39
39.6
38.8
43.9
37.4
47.5
40
40
37.6
41 .3
45.8
38.5
39.7
41 .9
40.2
40.3
41 .7
40.7
40.5
40.7
42.2
39.0
44.6
41.4
38.3
38.5
39.4
40.4
43.4
46.1
40.0
38.6
39.8
39.4
39.6
42.5
37.1
39.9
Nitrate, Nitrate + Nitrite
110 mn/Ll
10.0
11.3
9.9
10.2
9.5
8.6
9.7
10.1
9.0
9.4
9.5
9.5
9.2
10.8
8.8
10.1
#N/A
10.2
8.2
8.4
7.6
6.6
7.6
7.3
7.1
7.0
7.0
6.6
7.0
7.1
7.1
7.1
7.0
7.36.
6.30
7.22
7.84
7.28
5.91
5.3
7.02
7.7
6.33
6.45
6.27 ----------6.7
6.56
7.22 --6.77
6.87
7.06
6.47
6.90
6.12
6.34
6.10
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
TW4-5
Sampling Event
TABLE 1 (8 of 33)
Historic Summary Of Monitoring Well Analytical Results Up To The 2nd Quarter 2022
Chloroform Contamination Investigation
DUSA White Mesa Mill
Parameter
IGWQS)
Carbon Tetrachloride Chloroform Chloromethane Methylene Chloride
15 ua/LI 170 ua/LI 130 uo/LI (5 uQ/Ll
Chloride
No GWQS (mQ/Ll
Nitrate, Nitrate + Nitrite
110 ma/Ll
1st Qtr 3/1612005 NA 120 NA NA NA 4.9
2nd Qtr 5125/2005 NA 113 NA NA NA 3.7
3rd Qtr 8/31/2005 <2.5 82 5.8 <2.5 NA 6.0
4th Qtr 1217/2005 <2.5 63 2.5 <2.5 56 6.0
1stOtr 31912006 <2.5 66 3.1 <2.5 52 6.0
2nd Qtr 6/1412006 <2.5 51 3.1 <2.5 51 5.9
3rd Qtr 7/20/2006 <1.0 53.7 <1.0 <1.0 54 6.7
1'4,"th"-';'!Q"'-tr ___ -::1-'c1/~8~/2;":0~06~<:..,1-'c.0'-------+----'4'-'7c-.1:-l"<"-1'-".0'-------+.:.<1,c.'E'O------l-------"-5"-51---------~2.9 1stQtr 2/28/2007 <1.0 35 <1.0 <1.0 57 iii'
2nd Qtr 6/27/2007 <1.0 26 <1.0 <1.0 45 7.0
3rd Qtr 8/15/2007 <1.0 9.2 <1.0 <1.0 38 7.7
4th Qtr 10/10/2007 <1.0 9.4 <1.0 <1 .0 39 8.2
1stQtr 3/28/2008 <1.0 11 <1.0 <1.0 36 7.4
2nd Qtr 6/25/2008 <1.0 9.3 <1.0 <1 .0 37 8.7
3rd Qtr 9/10/2008 <1.0 11 <1.0 <1 .0 34 7.9
4th Qtr 10/15/2008 <1.0 10 <1.0 <1.0 37 9.3
1st Qtr 3/412009 <1.0 12 <1.0 <1 .0 34 7.9
2nd Qtr 6/2312009 <1.0 13 <1.0 <1.0 37 7.5
3rd Qtr 9/14/2009 <1.0 12 <1.0 <1 .0 48 8.3 i: g:; 1~~:;~g~~ :; g 8;; :-;"g"-------1-:-';'cg'------+-------':'-'!+---------'~-"~'I
2nd Qtr 6/14/2010 <1.0 12 <1.0 <1 .0 28 7.1
3rd Qtr 8/11/2010 <1.0 12 <1.0 <1.0 38 7.0
4th Qtr 10/15/2010 <1.0 11 <1.0 <1 .0 41 7.2
1stQtr 2/22/2011 <1.0 10 <1.0 <1.0 34 7.0
2nd Qtr 5/26/2011 <1.0 9 <1.0 <1 .0 35 7.2
3rd Qtr 817/2011 <1.0 10 <1.0 <1.0 37 7.5
4th Qtr 11/16/2011 NA #N/A NA NA 30 6.0
1,rnfr U/ __ it1~;~g;; =lL ________ ._ ____ JJ;tL _____ :; g NA 22 #NtA 5.8
2nd Qtr 6/6/2012 <1.0 8.4 <1.0 <1.0 ----------39 8.0
3rd Qtr 9/11/2012 <1.0 12.0 <1.0 <1.0 37 8.1
4th Qtr 10/4/2012 <1.0 8.0 <1.0 <1 .0 38 7.7
1stQtr 2/13/2013 <1.0 10.8 <1.0 <1.0 34.3 8.24
2nd Qtr 6/1312013 <1.0 11.2 <1.0 <1 .0 36.5 10.70
3rdQtr 9/512013 <1.0 11.6<1.0 <1 .0 39.1 7.79
4th Qtr 11/13/2013 <1.0 14.4 <1.0 <1.0 41.1 7.75
1stQtr 1/3012014 <1.0 12.5 <1.0 <1 .0 40.5 9.16
2nd Qtr 5/2212014 <1 .0 13.4 <1.0 <1.0 51.4 7.78
3rd Qtr 8/14/2014 <1 .0 12.0 <1.0 <1 .0 44 7.2 i:g~ ,~;;t~g;: :; g ;;i :; g'-------+.:.:;"'•'E'g------11--------:"'~~.-'-;1----------"~"!;'-!-I;
DuplicateTW4-70 <1.0 13.8 <1.0 <1 .0 46.4 8.81
2nd Qtr 6/10/2015 <1 .0 13.3 1.07 <1.0 47.3 7.08
3rd Qtr 9/10/2015 <1.0 12.9 <1.0 <1.0 52.2 8.1 i: g;; 1~;~~;~g;~ :; g ii g :{""g'-----t-:;~."'g-------1------:"'~"'.~"-l--------"~o"'·o"-I~
2nd Qtr 5/23/2016 <1 .0 13.6 <1.0 <1.0 45.9 8.98
3rd Qtr 8/3/2016 <1.0 10.8 <1.0 <1 .0 44.6 8.49
4th Qtr (3) 10/26/2016 <1.0 9.9 <1.0 <1 .0 47.8 8.32
D~llcateTW4-75 _____ <1.0 _ ~----~:.Q .<J:Q_ ______ <1 .0 49.5 8.34
1st Qtr 3/15/2017 <1.0 12.6 <1.0 <1.0 ------44.7 8.49
2nd Qtr 6/1512017 <1 .0 14.6 <1.0 <1 .0 47.3 8.52
3rd Qtr 8/812017 <1 .0 14.6 <1.0 <1.0 48.6 8.52
4th Qtr 10/11/2017 <1.0 13.8 <1.0 <1.0 42.5 8.57
OWMRCsolltsample <0.19 12 <0.3 <0.32 47 8.6
·1stQtr 3/1212018 <1.0 15.2 <1.0 <1.0 51.2 8.36
2nd Qtr 6/13/2018 <1.0 13.9 <1.0 <1 .0 47.3 9.24
3rd Qtr 8/30/2018 <1.0 15.4 <1.0 <1.0 54.7 7.34
DuphcateTW4-70 <1.0 15.3 <1.0 <1.0 55.9 7.28
4th Qtr 11/28/2018 <1.0 15.6 <1.0 <1.0 49.8 7.67
DuolicateTW4-70 <1.0 16.2 <1.0 <1.0 48.5._ ______ ~7 .. 80
·,·stOtr 311612019 <1.0 14.1 <1.0 <1.0 47.'il 7.38
2nd Qtr 6/13/2019 <1.0 15.8 <1.0 <1 .0 49.3 7.62
3rd Qtr 9/11/2019 <1.0 14.6 <1.0 <1.0 46.1 7.04
DupllcateTW4-70 <1.0 13.6 <1.0 <1.0 45.8 6.89
4th Qtr 12/14/2019 <1.0 15.7 <1.0 <1 .0 53.1 6.97
Ou llcate TW4-70 <1.0 16.0 <1.0 <1 .0 52.5 7.29
·,·stQtr 3/17/2020 <1.0 14.8 <1.0 <1.0 41i:°3 ,:·,o
DuphcateTW4•70 <1.0 14.8 <1,0 <1.0 48.4 7.72
2nd Qtr 6/1112020 <1.0 15.4 <1.0 <1 .0 49.5 7.83
3rd Qtr 9/18/2020 <1.0 14.8 <1.0 <1 .0 47.0 6.37 i: g;; !};:;~g~~ :; g ;~::1-:'-';"'g'------1-':-'-;"'g'------1-------"5"0.j"'~+--------"~"-:~"'~'I
2nd Qtr 6/16/2021 <1.0 13.0 <1.0 <1 .0 50.8 8.11
3rd Qtr 9/22/2021 <1.0 11.2 <1.0 <1.0 39.8 6.63
1'4c"th"-'=!Q"'tr ___ -::1=.2,~8~12c':0~2=-1l-<'-'1"'.o~ _____ -+----1:"2:"'.4:-f-'<c.,1";.o'-------+c:<71.=o _____ -ll--------",51='.J 6.71
1stQtr 3/23/2022 <1.0 11.0 <1.0 <1 .0 47.7 7.3
2ndQtr 6/16/2022 <1.0 10.3 <1.0 <1 .0 40.7 7.1
(1) voes were resampled because laboratory missed holding time.
(2) As of March 2012 both nonh and south wild hfe ponds no lon.a_er recervi~ water
(3) chloroform .f.Ume!,_n~ well 1W4•39 started m 11120/16 __
NA and #N/A(for graphs)= not analyzed
Shaded md1cates concentrations exceeding GWQS.
TW4-6
Sampling Event
TABLE 1 (9 of 33)
Historic Summary Of Monitoring Well AnalY.tical Results Up To The 2nd Quarter 2022
Chloroform Contamination Investigation
DUSA White Mesa Mill
Parameter
(GWQSI
Carbon Tetrachloride Chloroform Chloromethane Methylene Chloride
15 ua/LI 170 ua/LI 130 ua/LI 15 ua/LI
Chloride
No GWQS Ima/LI
Nitrate, Nitrate + Nitrite
110 mo/LI
1st Qtr 3/1612005 NA <1.0 NA NA NA 0.2
2nd Qtr 5/25/2005 NA 2.5 NA NA NA 0.4
3rd Qtr 8/31/2005 <1.0 10 2.8 <1.0 NA 0.8
4111 Qtr 12/712005 <1.0 17 1.3 <1.0 32 0.9
1stQtr 3/9/2006 <1.0 31 <1.0 <1.0 31 i'.'2·
2nd Qtr 6114/2006 <1.0 19 <1.0 <1.0 30 1.0
3rd Qtr 7/20/2006 <1.0 11 <1.0 <1.0 37 0.6
4th Qtr 1118/2006 <1.0 42.8 <1.0 <1.0 65 1.4
1stQtr 2/28/2007 <1.0 46 <1.0 <1.0 32 1.8
2nd Qtr 6/2712007 <1.0 11 <1.0 <1.0 38 0.6
3rd Qtr 8/15/2007 <1.0 18 <1.0 <1.0 36 0.7
"4"111"-'=Q"'tr ___ 1~0"'/1~0,,,./2~0~0'="7+'<'c1c,.0~------+-----=18~<:_,1~.0'--------+"<"'1."'0 _____ _,1-------c!3-:'.5l----------'0.8 1st Qtr 3/28/2008 <1.0 52 <1.0 <1.0 33 i'.T
2nd Qtr 612512008 <1.0 24 <1.0 <1.0 35 0.9
3rd Qtr 911012008 <1.0 39 <1.0 <1.0 35 1.1
4111 Qtr 1011512008 <1.0 37 <1.0 <1.0 33 1.0
1stQtr 3/4/2009 <1.0 81 <1.0 <1.0 35 2.2
2nd Qtr 6123/2009 <1.0 1201_<~1"'.0,_ ___ _,,_<~1~.0'-----37 2.7
3rd Qtr 9/14/2009 <1.0 280 <1.0 <1.0 37 5.0
4111 Qtr 12/29/2009 <1.0 250 <1.0 <1.0 41 6.1
1stQtr(5) 2/25/2010 <1.0 ->----1000 <1.0 ------<1.0 ---------------45 1.8
2nd Qtr 611412010 <1.0 590 <1.0 <1.0 33 2.5
3rd Qtr 811112010 <1.0 630 <1.0 <1.0 31 3.9
4th Qtr 1011512010 <1.0 420 <1.0 <1.0 41 4.3
1stQtr 2/22/2011 <1.0 47 <1.0 <1.0 40 0.7
2nd Qtr 512612011 <1.0 9.6 <1.0 <1.0 42 0.3
3rd Qtr 81712011 <1.0 16 <1.0 <1.0 39 0.3
4th Qtr 1111612011 NA #NIA NA NA 36 0.8
(1) 121712011 <1.0 21 <1.0 <1.0 NA #NIA
(2) 11/16/2011 <1.0, 50 <1.0 <1.0 33 0.8
·1st0tr(4L, __ 1/1812012 <1.0 ---,_ _____ 3~ <~'!_ ______ <1.0 _________ 4380 0.7
2nd Qtr 6/6/2012 <1.0 4.7 <1.0 <1.0 0.2
3rd Qtr 9/11/2012 <1.0 6.9 <1.0 <1.0 21 0.1 i~ g:; ;i~;~~;; :; ~ 68H;"'.~"-----i-::'-'~"".~'------+-------4-=o4"1Cl----------"~J
2nd Qtr 6/1312013 <1 .0 4.86 <1.0 <1.0 37.9 0.2
3rd Qtr 91512013 <1.0 5.93 <1.0 <1.0 40.6 0.2
4111Qtr 11113/2013 <1.0 5.51 <1.0 <1.0 40.2 1.5
1st Qtr 1/29/2014 <1.0 5.7 ;;:,.o <1.0 40.6 0.2
2nd Qtr 5122/2014 <1.0 10.3 <1.0 <1.0 37 0.3
3rd Qtr 8/14/2014 <1.0 202 <1.0 <1.0 40 4.2
(3) 9/24/2014 <1.0 260 <1.0 <1.0 NA #NIA i~~g:; ,~;~;;~~~: :~~ 1,;~~ 11"-~-----1-:.:..~cc.~e_------i------...::!.!~e.i!.f----------'~"-'~"II
2nd Qtr 6/1012015 <1.0 1,040 <1.0 <1.0 41.6 5.9
3rd Qtr 9/10/2015 <1.0 1,040 <1.0 <1.0 47 6.8
4thQtr 10/2912015 <1.0 843 <1.0 ~J~.o'------------<-------~40~·=2,.._______ 5.6
1stQtr 3122/2016 <1.0 834 <1.0 <1.0 42.3 6.79
2ndQtr 618/2016 <1.0 486,_<~1~.0,_ ___ _,_<~1.=0 _____ -1 44.1 3.19
3rd Qtr 7127/2016 <1.0 433,_<~1~.0'------<-<~1.=0___ _ 42.21-______ _,,_3."'8"15
4111 Qtr 10126/2016 <1.0 301 <1.0 <1.0 46.1 3.74
1stQtr 3/16/2017 <1.0 288 <1.0 <1.0 42.1 3.15
2nd Qtr 6121/2017 <1.0 239 <1.0 <1.0 42.6 2.42
3rd Qtr 818/2017 <1.0 129 <1.0 <1.0 42.9 1.71
4th Qtr 10111/2017 <1.0 121 <1.0 <1.0 37.6 1.71 Tsf citr 3120?.!018 <1.0 _________ ,_ ____ 159 <1.0 ______ <1.0 43.1 1.96
2ndQtr(6) 611412018 <1.0 74.9 <1.0 <1.0 --------40.2 1.48
3rd Qtr 91512018 <1.0 53.2 <1.0 <1.0 44 1.18
4111 Qtr 12112/2018 <1.0 37.0 <1.0'-----t-<~1-ccO ______ l------=20~·=0t--------c"Oc'.9"'10
1stQtr 3/1912019 <1.0 23.:i' <1.0 <1.0 41 0.755
2nd Qtr 611312019 <1.0 15.8 <1.0 <1.0 38.1 0.484
3rd Qtr 911112019 <1.0 15.8 <1.0 <1.0 39.7 0.412
4th Qtr 12114/2019 <1.0 7.4 <1.0 <1.0 45.7 0.244
1stQtr 311712020 <1.0 6.93 <1.0 <1.0 43.2 0.222
2nd Qtr 6/1112020 <1.0 4.9 <1.0 <1.0 42.4 0.205
3rdQtr 9118/2020<1.0 3.6 <1.0 <1.0 40.5 0.144
4th Qtr 11/4/2020 <1.0 4.61 <1.0 <1.0 42.9 0.197
1st Qtr 3/1812021 <1.0 3.78 <1.0 <1.0 41 .6 0.205
2nd Qtr 6/16/2021 <1.0 2.9 <1.0 <1.0 43.8 0.215
3rd Qtr 9/1512021 <1.0 3.71 <1.0 <1.0 34.1 0.166
4111 Qtr 12/8/2021 <1.0 3.92 <1.0 <1.0 44.8 <0.100
1stQtr 3/22/2022 <1.0 3.10 <1.0 <1.0 31.5 0.1
2nd Qtr 6/16/2022 <1.0 2.1 <1.0 <1.0 43.1 0.21
(1) Voes were resampled because laboratory missed holding time.
(2) Results of the TW4-70 the duplicate sample for 1W4-6.
(3) Reanalyzed for VOCs only.
(4) As of March 2012 both north and south wtld life pends no lon.2,_er receM_!!9 water
(5) Chloroform.,eumf!'!i wen TW◄--4 stared m 1st qtr 2010 --·
,i~ Chloroform _£Umf!,n.a, well TW◄--41 mstalled M§J018 __
NA and #N/A(for graphs)= not analyzed
Shaded indicates concentrations exceeding GWQS.
TABLE 1 (10 of 33)
Historic Summary Of Monitoring Well Analytical Results Up To The 2nd Quarter 2022
Chloroform Contamination Investigation
DUSA White Mesa Mill
TW4-7
Sampling Event
Carbon Tetrachloride Chloroform Chloromethane
IS ua/U 170 ua/U 130 un/U
1stQtr 3/16/2005 NA 3,100 NA
2ndQtr 5/25/2005 NA 2,700 NA
3rd Qtr 8/31/2005 <10 3,100 <10
4th Qtr 1217/2005 <50 2,500 <50
1stQtr 31912006 <50 1,900 <50
2ndQtr 6/1412006 <50 2,200 <50
3rd Qtr 7/2012006 <50 2,140 <50
4th Qtr 111812006 1.5 2 160 <1.0
1stQtr 2/2812007 1.1 1,830 <1.0
2nd Qtr 6/2712007 1.5 2,600 <1.0
3rdQtr 811512007 1.4 2,300 <1.0
4th Qtr 10/1012007 1.2 1 900 <1.0
1stQtr 3/2812008 1.3 2,200 .<1.0
2nd Qtr 6/2512008 1.3 1,800 <1.0
3rdQtr 9110/2008 1.4 1,600 <1.0
4th Qtr 10115/2008 NA #NIA NA
1111812008 <2.0 2 500 <2.0
1stQtr 3111/2009 1.2 1,800 ·;;;~o
2nd Qtr 6/23/2009 <1.0 1,400 <1.0
3rdQtr 9114/2009 1 1,500 <1.0
4th Qtr 12/29/2009 <1.0 1 300 <1.0
1stQtr 2/2512010 <1.0 1,200 ~-i'.o
2nd Qtr 6114/2010 <1.0 1,100 <1.0
3rd Qtr 8111/2010 1 1,500 <1.0
4th Qtr 1011512010 <1.0 1100 <1.0
1stQtr 212312011 <1.0 1,300 <1.0
2nd Qtr 61112011 <1.0 1,200 <1.0
3rd Qtr 8/1812011 <1.0 1,200 <1.0
4thQtr 11/2912011 <1.0 1 000 <1.0
1st Qtr (1) __ 1/1912012 <1.0 '----.!.,Q.0.2 <1.0 -----------~--------2ndQtr 611412012 <1.0 790 <1.0
3rd Qtr 9/13/2012 <1.0 870 <1.0
4th Qtr 10/4/2012 <1.0 940 <1.0
1statr 2/1312Ci'i'3 <1.0 940 <1.0
2ndQtr 6/1812013 <1.0 953 <1.0
3rd Qtr 9/12/2013 <1.0 1,040 <1.0
4th Qtr 11/14/2013 ::J.O 1 050 <1.0
1stQtr 2/512014 5.41 946 <1.0
2nd Qtr 512212014 4.78 847 <1.0
3rdQtr 812712014 <1.0 857 1.5
4th Qtr 1013012014 <1.0 926 <1.0
1stQtr(2) 3/1812015 <1.0 --<-----942 --------<1.0
2nd Qtr 6/1112015 <1.0 950 <1.0
3rdQtr 9/1012015 <1.0 897 <1.0
4thQtr 10129/2015 <1.0 847 <1.0
1stQtr 3122/2016 <1.0 834 <1.0
2nd Qtr 618/2016 <1.0 909 <1.0
3rdQtr 81412016 <1.0 1,000 <1.0
4thQtr 10126/2016 <1.0 886 <1.0
1stQtr 3/211201 7 <1.0 986 <1.0
2nd Qtr 6/21/2017 <1.0 968 <1.0
3rd Qtr 81412017 <1.0 1,070 <1.0
4th Qtr 10111/2017 <1.0 884 <1.0
DWMRC split samole <7.6 890 <12
1s1Qtr 3121/2018 <1.0 721 ·;;1:0
2nd Qtr 611412018 <1.0 751 <1.0
3rdQtr 91612018 <1.0 781 <1.0
4th Qtr 12/1312018 <1.0 838 <1.0
1s1Qtr 3/2012019 <1.0 736 <1.0
2nd Qtr 6/1912019 <1.0 862 <1.0
3rdQtr 9112/2019 <1.0 801 <1.0
4th Qtr 1211812019 <1.0 546 <1.0
1stQtr 3/1812020 <1.0 746 <1.0
2nd Qtr 611212020 <1.0 864 <1.0
Deplicate TW4•75 <1.0 871 <1.0
3rdQtr 9119/2020 <1.0 971 <1.0
4thQtr 11111/2020 <1.0 967 <1.0
DWMRC s tit samole <10 930 <20
1s1Qtr 3/2412021 <1.0 875 ·;;fo
2ndQtr 611712021 <1.0 819 <1.0
3rdQtr 9/23/2021 <1.0 801 <1.0
4th Qtr 12/912021 <1.0 868 <1.0
1s1Qtr 3124/2022 <1.0 776 2.1
2ndQtr 6122/2022 <1.0 447 <1.0
( 1) As of March 2012 both north and south wdd life ponds no lon~r rece1v1~ water
J.2) chloroform,e_uml!!!12. wells TW4•1 and TW4•2 started m 1114/15 __ ---·
NA and #N/A(for graphs)= not analyzed
Shaded 1nd1c.ates concentrat1ons exceedmg GWQS.
Bold and italics indicates the MDL exceeded the GWQS.
J = Approximated value
Parameter
CGWQS)
Methylene Chloride rs ua/Ll
NA
NA
<10
<50
<50
<SO
<50
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
NA
<2.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1 .0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0 -------
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
17 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
<20
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
Chloride
No GWQS Ima/LI
NA
NA
NA
52
48
47
51
49
47
45
44
45
43
43
35
40
NA
35
37
37
37
35
31
36
38
45
35
37
37
37 ---------41
40
41
37.7
39.3
36.4
37.2
38.2
37.7
39
40.2
40.4
42.1
46.7
40.6
42.4
44.1
42.3
45.8
4ci:s
43.3
44.7
43.7
42.0
44.5
41.5
48.5
42.8
41.3
43.0
39.6
47.2
42.1
44.1
43.1
41.5
42.8
43
46.2
41.7
42.8
42.9
41~3
42.5
Nitrate, Nitrate + Nitrite
f10ma/Ll
5.2
5.4
5.2
5.3
1
4.5
4.7
4.6
6
5.1
4.7
4.7
4.2
4.8
4.16
4.01
#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
4.1
3.9
TABLE 1 (11 of 33)
Historic Summary Of Monitoring Well Analytical Results Up To The 2nd Quarter 2022
Chlorofonn Contamination Investigation
TW4-8
Sampling Event
DUSA White Mesa Mill
Parameter
IGWQS)
Carbon Tetrachloride Chlorofonn Chloromethane ,Methylene Chloride
1st Qtr 3/16/2005 NA
2nd Qtr 5/25/2005 NA
3rd Qtr 8/31/2005 <1.0
4th Qtr 12/7/2005 <1.0
1st Qtr 3/9/2006 <1.0
2nd Qtr 6/14/2006 <1.0
15 ua/Ll 170 ua/Ll 130 ua/Ll (5 uo/L)
<1 .0
<1 .0
10 NA
NA
1.1
1.3
1.8
<1.0
NA
NA
1.7 NA
<1.0
2.1 <1.0
1.0 <1.0
3rd Qtr 7/20/2006 <1.0 <1 .0 <1.0 <1.0
4th Qtr 11/8/2006 <1.0 <1 .0 <1.0 <1.0
1stQtr 2/28/2007 <1.0 2.5 <1.0 <1.0
2nd Qtr 6/27/2007 <1.0 2.5 <1.0 <1.0
3rd Qtr 8/15/2007 <1.0 1.5 <1.0 <1.0
Fi"t""t a"0"':---'1"'~'-;~"'~"';~"'g"'g'--~1-:'-';""•g'---------1-<-,-.o----"~§ :; g :; g
2nd Qtr 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 Qtr 10/15/2008 <1.0 <1.0 <1.0 <1.0
1st Qtr 3/4/2009 <1.0 <1.0 <1.0 <1.0
2nd Qtr 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 12/17/2009 <1.0 <1.0 <1.0 <1.0
1stQtr 2/24/2010 <1.0 <1.0 <1.0 <1.0
2nd Qtr 6/14/2010 <1.0 <1.0 <1.0 <1.0
3rd Qtr 8/18/20101-<'-'1-".o'---------1-<'-'1"'.o'----+<'-'1'-".o'-----+-"-<1'--' . .._o_
4th Qtr 10/15/2010 <1.0 <1.0 <1.0 <1.0
1st Qtr 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 ,,rniiHI ;f1~~g;~ :; g :; g :; g :; ~
2nd Qtr 5/13/2012 <1.0 <1.0 ~1.0 <1.0 -----
3rd Qtr 8/29/2012 <1.0 <1.0 <1.0 <1.0
4th Qtr 10/3/2012 <1.0 <1 .0 <1.0 <1.0
1st Qtr 217/2013 <1.0 <1.0 <1.0 <1.0
2nd Qtr 5/30/2013 <1.0 <1.0 <1.0 <1.0
3rd Qtr 9/5/2013 <1.0 <1.0 <1.0 <1.0
Chloride Nitrate, Nitrate + Nitrite
No GWQS !ma/Ll 110 ma/LI
NA <0.1
NA 0.2
NA <1.0
41 <1.0
39
37 <1.0
39
40 <.1
39
42
42 <1.0
43
46
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
0.3
0.1
0.7
0.2
0.5
0.1
46 0.1
52 <0.1
45 0.1
46 0.1
45 0.2
NA #N/A
45 0.3
-------44 0.2
48 0.1
47 <0.1
46.6
45.5 <0.1
47.5
0.41
0.1
4thQtr 11/7/2013 <1.0 <1 .0 <1.0 <1.0 46.1 <0~.1 _______ __,
1st Qtr 1/23/2014 <1.0 63.8 <1.0 <1.0 48.5 ---
(2) 2/6/2014 <1 .0 100 <1.0 <1.0 46.5
2nd Qtr 5/22/2014 <1.0 122 <1.0 <1.0 53
3rd Qtr 8/27/2014 <1.0 107 <1.0 <1.0 47
4th Qtr 10/29/2014 <1.0 191 <1.0 <1.0 46.7
1stQtr (4) 3/12/2015 <1.0 -----961 ~1.0 ------<1.0 -------49.6
0.166
0.166
0.538
0.6
0.914
2.3
2nd Qtr 6/11/2015 <1.0 981 <1.0 <1.0 53 1.88
3rd Qtr 9/10/2015 <1.0 747 <1.0 <1.0 59.6 1.96 ;~~g:; 1~:~~;~g;~-Hg ~~~ :;g :;g ---+------~5'"'45'-';~+-------~/4j
;~dd i: ~;:;~gi: :; g ;;;t:j;Jgt~~~~~~~~.1-=-:c'i~g------1f------~;:~.-=-~l----_---~~'-'i~6
i:,4ecth'-cQ"'tr'---__ 1~0c,i2s.c7~/2""0"'16~<..c1,~0 ______ l----':4""7~21-<:..,1~.0'----+<~1~.0c_ ____ -+------'6~0c".11-------~2~.1-"-"6
1st Qtr 3/21/2017 <1 .0 359 <1.0 <1.0 57.4 2.06
2nd Qtr 6/21/2017 <1.0 256 <1.0 <1.0 58.8 1.97
3rd Qtr 8/4/2017 <1 .0 223 <1.0 <1.0 61 .2 1.64
4th Qtr 10/11/2017 <1 .0 214 <1.0 <1.0 52.2 1.92
Depiicat~ .. iw4-75 <1 .0 194 1.12 <1.0 56.2 1.71
DWMRCs lrtsamole <1.9 230 4.7 J.1-<:s3~.0'--------l-------c=6<,1Cj-_______ 1!c.9~0!.j
1st Qtr 3/21/2018 <1 .0 220 <1.0 <1.0 60.8 1.36
DeplicateTW4-75 <1 .0 171 <1.0 <1.0 60.8 1.36
2nd Qtr 6/14/2018 <1 .0 155 <1.0 <1.0 53.8 1.31
3rd Qtr 9/5/2018 <1.0 137 <1.0 <1.0 63.2 1.40
4th Qtr 12/13/2018 <1.0 93.8 <1.0 <1.0 53.1 1.35
1stQtr 3/19/2019 <1 .0 103 <1.0 <1.0 54.3 1.23
2nd Qtr 6/19/2019 <1.0 96 <1.0 <1.0 56.5 1.1
3rd Qtr 9/12/2019 <1.0 75.4 <1.0 <1.0 52 0.999
DeplicateTW4-75 <1 .0 75.6 <1.0 <1.0 52.5 1.030 i~~g:; 1;;;:;~~~~ ::g ::ii-:::..,;~g~----j-=:-:-;""g'------1------~~0="3'=~+---------,;-':•~:-'-11
2nd Qtr 6/12/2020 <1.0 53.8 <1.0 <1.0 56.9 1.06
3rd Qtr 9/18/2020 <1.0 39.5 <1.0 <1.0 52.6 0.894
4th Qtr 11/11/2020 <1.0 51.3 <1.0 <1.0 54.7 1.27
DeplicateTW4-70 <1.0 52.9 <1.0 <1.0 49.9 1.27
OWMRC s ht samole <10 50.0 <20 <20 56 0.16 H
1st Qtr 3/18/2021 <1.0 26.9 <1.0 <1.0 52.8 1.00
2nd Qtr 6/16/2021 <1 .0 22.3 <1.0 <1.0 51.5 1.12
3rd Qtr 9/22/2021 <1.0 17.0 <1.0 <1.0 40.8 0.665
DeplicateTW4•70 <1 .0 16.4 <1.0 <1.0 43.1 0.59
4th Qtr 12/8/2021 <1.0 17.2 <1.0 <1.0 54.9 0.738
1stQtr 3/23/2022 <1.0 15.1 <1.0 <1.0 50.8 0.8
2nd Qtr 6/16/2022 <1 .0 10.9 <1.0 <1.0 52.8 0.64
(1) VOCs were resampled because laboratory missed holding time.
(2) Resampled to verify chloroform concentration that was collected on 1/23/14.
(3l As of March 2012 both north and south wild life .e.,onds no lon.18r rece1v1~ water
,i4_lchloroform .E.umpma_ welts TW4•1 and TW4-2 started in 1/14/15 ____ _
NA and #N/A(for graphs)= not analyzed
Shaded indicates concentrations exceeding GWQS.
J = Approximated value
H = Sample was analyzed beyond holding times and may not be accureate concentration.
TABLE 1 (12 of 33)
Historic Summary Of Monitoring Well Analytical Results Up To The 2nd Quarter 2022
Chloroform Contamination Investigation
TW4-9
Sampling Event
DUSA White Mesa Mill
Parameter
IGWQSl
Carbon Tetrachloride Chloroform Chloromethane Methylene Chloride
15 ua/Ll 170 ua/Ll 130 ua/Ll 15 ua/Ll
Chloride Nitrate, Nitrate + Nitrite
No GWQS I ma/Ll 110 mo/L\
1st Qlr 3/16/2005 NA 3.8 NA NA NA 1.3
2nd Qtr 5/25/2005 NA 1.2 NA NA NA 1.3
3rd Qtr 8/31/2005 <1.0 <1.0 2.9 <1.0 NA 1.3
14th Qtr 12/7/2005 <1.0 <1.0 <1.0 <1.0 42 1.3
1st Qtr 3/9/2006 <1.0 <1.0 2.6 <1.0 38 1.5
12nd Qtr 6/14/2006 <1.0 19 2.7 <1.0 39 1.5
13rd Qtr 7/20/2006 <1.0 <1.0 <1.0 <1.0 41 0.9
14th <1t, 11/8/2006 <1.0 <1.0 <1.0 <1.0 44 0.7
1st Qtr V28/2007 <1.0 <1.0 <1.0 <1.0 44 0.6
12nd Qtr 6/27/2007 <1.0 21 <1.0 <1.0 42 1.3
'3rd Qtr 8/15/2007 <1.0 9.5 <1.0 <1.0 38 1.8
4th Qtr 10/10/2007 <1.0 8.7 <1.0 <1.0 40 2
1st Qtr 3/28/2008 <1.0 1.3 <1.0 <1.0 35 2.1
2nd Qtr 6/25/2008 <1.0 1 <1.0 <1.0 35 2.3
3rd Qtr 9/10/2008 <1.0 <1.0 <1.0 <1.0 28 2.79
114th Qtr 10/15/2008 <1.0 <1.0 <1.0 <1.0 58 1.n,
1stQtr 3/4/2009 <1.0 <1.0 <1.0 <1.0 30 2.!
2nd Qtr 6/23/2009 <1.0 <1.0 <1.0 <1.0 30 2.
3rd Qtr 9/14/2009 <1.0 <1.0 <1.0 <1.0 30 2.5 ~i"'~"-~-"g'-":~---1:.e~e.,'.~'-';-"'.~"g"'~"-~+-:'-';"'.g'-------+:-'-;'-'.g"---+:'-';'-'.g'------f-:-'-'i•""g------f-------'}f._ _______ _,_i_"-';'
2nd Qtr 6/14/2010 <1.0 <1.0 <1.0 <1.0 33 1.5
3rd Qtr 8/13/2010 <1.0 <1.0 <1.0 <1.0 40 1.2
4th Qtr 10/15/2010 <1.0 <1.0 <1.0 <1.0 34 1.8
1stQtr 2/17/2011 <1.0 <1.0 <1.0 <1.0 41 1.3
2nd Qtr 5/25/2011 <1.0 <1.0 <1.0 <1.0 38 3.4
3rd Qtr 8/16/2011 <1.0 <1.0 <1.0 <1.0 21 4
4th Qtr 11/16/2011 NA NA NA NA 38 2.3 1,ra1,W it1~;~g;~ :i g :; g :; g :; g NA 28 #~~
2nd Qtr --5/31 /2012 <1.0 -'::ci:<i" ____ '::c1.o <1.0 -----------------23 4.0
3rd Qtr 8/30/2012 <1.0 <1.0 <1.0 <1.0 22 3.9
4th Qtr 10/3/2012 <1.0 <1.0 <1.0 <1.0 21 3.8
1stQtr 2/7/2013 <1.0 <1.0 <1.0 <1.0 20.6 4.49
2nd Qtr 5/30/2013 <1.0 <1.0 <1.0 <1.0 21.4 4.49
3rd Qtr 9/5/2013 <1.0 <1.0 <1.0 <1.0 22.7 4.03
4th Qtr 11/7/2013 <1.0 <1.0 <1 .. 0'------f-"<-"1._,,0 _____ -li-------~23"'.-"61---------"4'-'.8"-17I
1stQtr 1/29/2014 <1.0 <1.0 <1.0 <1.0 22 4.36
2nd Qtr 5/22/2014 <1.0 6.9 <1.0 <1.0 24 3.44
3rd Qtr 8/14/2014 <1.0 47 <1.0 <1.0 27 2.7
4th Qtr 10/29/2014 <1.0 101 <1c,.0'---------f-'<-"1._,,0 _____ -lf--------=2"-5l---------"4".2"'-191
1stQtr 3/12/2015 <1.0 53_5· ;;-1·.o <1.0 29.5 3.28
2nd Qtr 6/11/2015 <1.0 35.1 <1.0 <1.0 35.3 1.83
3rd Qtr 9/3/2015 <1.0 48 <1.0 <1.0 39.3 1.44
4th Qtr 10/28/2015 <1.0 68.4 <1.0 <1.0 29.2
1st Qtr 3/17/2016 <1.0 74.3 <1.0 <1.0 33.6
2nd Qtr 6/8/2016 <1.0 76.2f-<'-'1"'.0,____ <1.0 35.1 __ _
3rd Qtr 8/3/2016 <1.0 -----l 76.8f-<'-'1'i.ot -:=,-:=,-:=,-:=,-:=,-:=,-:=,-:=,1-;_<-;.1.!.o.9.o-:=,-:=,-:=,-:=,-:=,-:=,-:=,-:=,-:=,-:=,-:=_~1::_-:=_-:=_-:=,-:=,-:=,-:=,-:=,-:=,-:=,-:=,-:=,""3l3ec."'16!!.l----------' 4th Qtr 10/26/2016 <1.0 76.0 <1J1 <1.0 37.4
1st Qtr 3/17/2017 <1.0 113 <1.0 <1.0 34.5 2.
2nd Qtr 6/21 /2017 <1.0 113 <1.0 <1.0 35.9 1.92
3rd Qtr 8/3/2017 <1.0 118 <1.0 <1.0 37 1.90
4th Qtr 10/11/2017 <1.0 132 <1.0 <1.0 32 2.18
0WMRC solit samole <0.98 120 <1.5 1.6 J 35 2.20
1st Qtr 3/21/2018 <1.0 159 <1.0 <1.0 38.3 1.85
2nd Qtr 6/4/2018 <1.0 134 <1.0 <1.0 35.7 1.85
0eplicate TW4-75 <1 .0 132 <1.0 <1.0 35.2 1.91
3rd Qtr 9/5/2018 <1.0 94.2 <1.0 <1.0 43.4 1.04
0eplicateTW4-75 <1 .0 92.4 <1.0 <1.0 42.7 1.11
4th Qtr 12/13/2018 <1.0 109 <1.0 <1.0 36.3 1.23
1st Qtr :ih"S/2019 <1.0 86.4 <1.0 <1.0 36.9 1.09
2nd Qtr 6/19/2019 <1.0 68.1 <1.0 <1.0 38.3 0.785
3rd Qtr 9/11/2019 <1.0 66.0 <1.0 <1.0 35.2 0.904
4th Qtr 12/18/2019 <1.0 54.8 <1.0 <1.0 40.1 0.744
1st Qtr 3/18/2020 <1.0 48.9 <1.0 <1.0 37.7 0.855
2nd Qtr 6/12/2020 <1.0 55.1 <1.0 <1.0 39.5 0.990
0eplicate TW4-70 <1.0 56.4 <1.0 <1.0 39.6 1.010
3rd Qtr 9/18/2020 <1.0 45.0 <1.0 <1.0 ·36.7 0.867
4th Qtr 11/11/2020 <1.0 47.1 <1.0 <1.0 37.2 1.11
DWMRC split sample <10 48.0 <20 <20 38 0.97
DWMRC Dup sample (TW4-81) <10 46.0 <20 <20 38 0.97
1st Qtr 3/18/2021 <1.0 39.0 <1.0 <1.0 40.7 1.06
Deplicate TW4•70 <1.0 38.2 <1.0 <1.0 38.7 1.07
2nd Qtr 6/16/2021 <1.0 102 <1.0 <1.0 37.4 2.0
3rd Qtr 9/22/2021 <1.0 30.0 <1.0 <1.0 30.8 0.700
4th Qtr 12/8/2021 <1.0 25.4 <1.0 <1.0 36.9 0.798
1st Qtr 3/23/2022 <1.0 16.5 <1.0 <1.0 34.6 0.8
2nd Qtr 6/22/2022 <1.0 9.8 <1.0 <1.0 41.7 0.6
( 1) voes were resampled because laboratory missed holding time. (2J. As of March 2012 both north and south wild life ponds no lon_1er receIvI!!9 water
NA and #N/A(for graphs)= not analyzed
Shaded indicates concentrations exceeding GWQS.
J = Approximate value .
TABLE 1 (13 of 33)
Historic Summary Of Monitoring Well Analytical Results Up To The 2nd Quarter 2022
Chloroform Contamination Investigation
DUSA White Mesa Mill
TW4-10 Parameter
Sampling Event IGWQS)
Carbon Tetrachloride Chloroform Chloromethane Methylene Chloride
15 ua/Ll 170 ua/Ll
1stQtr 3/16/2005 NA 140 NA
2ndQtr 5/25/2005 NA 62 NA
3rdQtr 8/31/2005 <2.5 110
4thQtr 12/7/2005 <2.5 300 <2.5
1stQtr 3/9/2006 <5.0 190 <5.0
2nd Qtr 6/14/2006 <5.0 300 <5.0
3rd Qtr 7/20/2006 <5.0 504 <5.0
4th Qtr 11/8/2006 <1.0 452
1stQtr 2/28/2007 <1.0 500 <1.0
2ndQtr 6/27/2007 <1.0 350 <1.0
3rdQtr 8/15/2007 <1.0 660 <1.0
4thQtr 10/10/2007 <1 .0 470 <1.0
1stQtr 3/28/2008 <1.0 620 <1.0
2nd Qtr 6/25/2008 <1.0 720 <1.0
3rd Qtr 9/10/2008 <1.0 660 <1.0
4th Qtr 10/15/2008 NA #N/A NA
11/18/2008 <2.0 1,200 <2.0
1stQtr 3/11/2009 <1.0 1,100 <1.0
2ndQtr 6/23/2009 <1.0 1,200 <1.0
3rdQtr 9/14/2009 <1.0 910 <1.0
4thQtr 12/22/2009 <1.0 300 <1.0
1stQtr 3/3/2010 <1.0 460 <1.0
2nd Qtr 6/14/2010 <1.0 220 <1.0
3rdQtr 8/12/2010 <1.0 100 <1.0
4thQtr 10/15/2010 <1.0 1,100 <1.0
1stQtr 2/23/2011 <1.0 620 <1.0
2nd Qtr 6/14/2011 <1.0 280 <1.0
3rdQtr 8/17/2011 <1.0 180 <1.0
4thQtr 11/16/2011 <1.0 110 <1.0
1st Otr (1) 1/19/2012 <1.0 76 <1.0
2nd Qtr 6/14/2012 <1.0 ------79 ~1.0
3rd Qtr 9/12/2012 <1.0 130 <1.0
4th Qtr 10/3/2012 <1.0 140 <1.0
1stOtr 2/13/2013 <1.0 154 <1.0
2nd Qtr 6/13/2013 <1.0 486 <1.0
3rdQtr 9/12/2013 <1.0 1,126 <1.0
4thQtr 11/14/2013 <1.0 1,380 <1.0
1stQtr 1/29/2014 5.16 1,260 <1.0
2ndOtr 5/23/2014 <1.0 1,110 <1.0
3rd Qtr 8/27/2014 <1.0 1,060
4th Qtr 10/30/2014 <1.0 1220 <1.0
1stQtr 3/18/2015 <1.0 1,210 <1.0
2ndQtr 6/11/2015 <1.0 1,240 <1.0
3rd Qtr 9/10/2015 <1.0 1,280 <1.0
4thOtr 10/29/2015 <1.0 1 350 <1.0
1stQtr 3/22/2016 <1.0 1,430 <1.0
2ndQtr 6/8/2016 <1.0 1,510 <1.0
3rd Qtr 8/4/2016 <1.0 1,500 <1.0
4th Qtr 10/26/2016 <1.0 1,290 <1.0
1stQtr 3/21/201i <1.0 1,260 <1.0
2ndQtr 6/21/2017 <1.0 1,140 <1.0
3rd Qtr 8/4/2017 <1.0 1,320 <1.0
4th Qtr 10/11/2017 <1.0 1,150 <1.0
DWMRC s lit samole <9.5 1100 <15
1stOtr 3/21/2018 <1.0 1,240 <1.0
2ndQtr 6/14/2018 <1 .0 914 <1.0
3rd Qtr 9/6/2018 <1.0 911 <1.0
4th Qtr 12/13/2018 <1.0 1,070 <1.0
1stQtr 3/20/2019 <1.0 869 <1.0
2nd Qtr 6/19/2019 <1.0 799 <1.0
3rd Qtr 9/12/2019 <1.0 734 <1.0
4th Qtr 12/18/2019 <1.0 768 <1.0
1stQtr 3/18/2020 <1.0 798 <1.0
2ndQtr 6/11/2020 <1.0 928 <1.0
3rd Qtr 9/19/2020 <1.0 854 <1.0
4th Qtr 11/11/2020 <1.0 903 <1.0
1stQtr 3/18/2021 <1.0 718 <1.0
2nd Qtr 6/17/2021 <1.0 609 <1.0
3rdQtr 9/23/2021 <1.0 545 <1.0
4th Qtr 12/9/2021 <1.0 675 <1.0
1stQtr 3/24/2022 <1.0 471
Deplicate TW4-75 <1.0 456
2nd Qtr 6/22/2022 <1.0 342 <1.0
(1) As of March 2012 both north and south wild llfe ponds no lon.1er recetl.'1!!9 water
NA and #N/A(for graphs)= not analyzed
Shaded indicates concentrations exceeding GWQS.
J = Approximate value
/JO un/LI 15 ua/Ll
NA
NA
6.2 <2.5
<2.5
<5.0
<5.0
<5.0
1.6 <1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
NA
.:'::~-0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0 -
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
1.5 <1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
16 ~-
<1.0
<1.0
<1 .0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1 .0
<1.0
<1.0
<1.0
<1.0
<1.0
1 <1.0
1 <1.0
<1.0
Chloride
No GWQS lma/Ll
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 ~
84.4
74.6
73.1
77
70
76
72.7
64.5
75.5
63.5
59.3
58.7
55.8
62
53.5
60.1
53.9
58.6
58.1
48.7
50.6
51.9
46.0
44.8
46.0
Nitrate, Nitrate + Nitrite
110 ma/Ll
1.6
0.8
1.1
3.3
2.4
3.5
6.8
5.7
7.3
5.1
7.3
6.7
7.3
9.9
9.23
10.5
#N/A
11 .6
9.8
8.1
3.8
5.0
1.6
0.8
11 .0
9.0
3.3
1.9
1.1
0.9
0.8
1.0
1.6
1.2
5.6
13.0
16.0
16.8
13.9
9.8
13.2
15.0
11.4
14.0
13.5
17.3
14.9
14.9
14.8
13.0
13.0
13.4
12.9
13.0
11.1
11.2
10 1
10.6
9.34
8.86
7.79
6.89
7.83
8.13
7.34
8.69
7.20
7.75
6.35
5.47
5.1
4.9
4.6
TABLE 1 (14 of 33)
Historic Summary Of Monitoring Well Analytical Results Up To The 2nd Quarter 2022
Chloroform Contamination Investigation
OUSA White Mesa Mill
1W4-11 (chlofolOfm pumping -U
atartlld1/14115) Parameter
Sampling Event {GWQSl
Carbon Tetrachloride Chloroform Chloromethane Methylene Chloride
15 uc/Ll 170 ua/Ll 130 uc/Ll 15 uc/Ll
1stQtr 311612005 NA 4,400 NA NA
2ndQtr 5/25/2005 NA 3,590 NA NA
3rd Qtr 8/3112005 <10 4,400 <10 <10
4th Qtr 12/712005 <100 4,400 <100 <100
1stQtr 31912006 <50 4,400 <50 <50
2ndQtr 6/1412006 <50 4,300 <50 <50
3rd Qtr 712012006 <50 4,080 <50 <50
4th Qtr 111812006 1.7 3 660 2.7 1.3
1stQtr 2128/2007 1.3 3,600 <1.0 1.6
2ndQtr 612712007 1.6 3,800 <1.0 <1 .0
3rdQtr 811512007 1.7 4,500 <1.0 <1 .0
4th Qtr 10/1012007 1.6 4 400 <1.0 q
1stQtr 3128/2008 <1.0 340 <1.0 <1.0
2nd Qtr 6/25/2008 <1.0 640 <1,0 <1 .0
3rdQtr 9110/2008 <1.0 900 <1.0 <1.0
4thQtr 10115/2008 NA #NIA NA NA
11/18/2008 <2.0 1 000 <2.0 <2.0
1stQtr 3/1112009 ::io 1,000 -~-io <1 .0
2nd Qtr 6123/2009 <1.0 980 <1.0 <1.0
3rdQtr 9/14/2009 <1.0 1,000 <1.0 <1 .0
4thQtr 12/22/2009 <1.0 860 <1.0 <1.0
1stQtr ...... ·31312010 <1.0 820 ·•1.0 <1.0
2nd Qtr 6114/2010 <1.0 820 <1.0 <1.0
3rdQtr 811212010 <1.0 800 <1.0 <1.0
4thQtr 10/15/2010 <1.0 720 <1.0 <1.0
1stQtr "" 02123/2011 . <10 1,000 <1.0 <1.0
2nd Qtr 611/2011 <1.0 930 <1.0 <1.0
3rdQtr 8117/2011 <1.0 820 <1.0 <1.0
4thQtr ....... ..111161201.1. <1.0 1500 <1.0 <1 .0
1st Qtr (1)° 1124/2012 <1.0 610 <1.0 <1.0
2nd Qtr 6/13/2012 <1.0 -----660 ~1.0 <1 .0 --------
3rd Qtr 9/13/2012 <1.0 740 <1.0 <1.0
4thQtr 1013/2012 <1.0 730 <1.0 <1 .0
1stQtr 2/13/2013 3.23 867 ·;ro <1 .0
2ndQtr 6/18/2013 <1.0 788 <1.0 <1 .0
3rd Qtr 911212013 <1.0 865 <1.0 <1 .0
4thQtr 11/13/2013 <1.0 874 <1.0 <1.0
1stQtr 21512014 5.19 ········ iiis <1.0 <1.0
2ndQtr 5/2312014 <1.0 751 <1.0 <1.0
3rd Qtr 812712014 <1.0 719 1.2 <1.0
4th Qtr 10/29/2014 <1.0 ---------.,_ ____ !!,01 <1.0 <1 .0
1st Qtr(2) 319/2015 1.24 2,450
<1.0 ______ <1 .0 --------
2ndQtr 6/1112015 <1.0 2,710 <1.0 <1.0
3rd Qtr 8131/2015 <1.0 1,120 <1.0 <1.0
4th Qtr 10/2912015 _.~_t9 2 730 <1.0 ---------------<1 .0 ----------1stQtr 319i2cii"Ei 1.2 ···2.660 <1.0 ~-1.o
2nd Qtr 512312016 2.19 3,340 <1.0 ---<1.0
3rdQtr 712512016 <1 .0 3,200 <i':o <1.0
4th Qtr 10112/2016 <1 .0 --3,200 <1.0 ~
1stQtr 3/8/2017 1.71 3,310 <1.0 <1 .0
2ndQtr 6/13/2017 1.83 3,370 <1.0 <1.0
3rdQtr 712612017 1.81 3,290 ·<1.0 <1.0
4th.air 1011112017 1.48 2,880 <1.0 <1.0
DWMRC SDlrt sample <38 2,900 <60 140 J
1stQtr 3/12/2018 1.82 3,090 <1.0 <1.0
2ndQtr 61812018 1.34 2,800 <1.0 <1.0
3rdQtr 812212018 1.47 3,050 <1.0 <1.0
4th Qtr 1112812018 1.33 2,930 <1.0 <1.0
1stQtr 31812019 1.48 2,820 <1.0 <1.0
2nd Qtr 61512019 1.52 2,970 1.4 <1 .0
3rd Qtr 9/412019 1.47 2,790 <1.0 <1.0
4th Qtr 12/18/2019 <1 .0 3 250 <1.0 <1.0
1stQtr 2/1912020 <1.0 2,990 <1.0 <1.0
2ndQtr 511112020 1.37 2,810 <1.0 <1 .0
3rd Qtr 9/4/2020 1.47 3,070 <1.0 <1 .0
4th Qtr 10/28/2020 <1.0 2 670 3.86 <1 .0
1st0tr 2/2312021 <1 .0 2,750 <1.0 <1.0
2nd Qtr 61912021 <1.0 3,320 <1.0 <1.0
3rdQtr 812412021 <1 .0 2,600 <1.0 <1.0
4th Qtr 12/112021 <1 .0 2,850 ~.1-0 <1.0
1stQtr 3/9/2022 <1 .0 2,780 <1.0 <1.0
2nd Qtr 61812022 1.0 2 550 2.7 <1.0
(1) As of March 2012 both north and south '.:t!!l~I!!! .e,onds n2, ~ger recerv1ng water
(2) Chloroform pumen.a, well started 1/14115 ______ _
NA = not analyzed
Bold and italics indicates the MDL exceeded the GWQS.
Bold and italics indicates the MDL exceeded the GWQS.
J = Approximated value
Chloride
No GWQS Imo/LI
NA
NA
NA
58
56
56
55
55
54
53
53
53
63
46
42
47
NA
49
44
49
46
42
40
43
49 46
49
48
46
43 ---------52
49
50 47j·
49.3
46.6
46.7
485
51.6
48
56.4
49.8
62.2
73.1
55.3
55.5
56.4 ---SS: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
Nitrate, Nitrate + Nitrite
110mc/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
7.7
7.3
7.9
9.5
#NIA
7.3
6.8
7.0
6.6
6.8
6.9
6.7
6.4
6.5
7.3
7.1
7.1
6.8
6.7
3.0
7.0
6.8
7.4
7.8
8.01
8.47
6.92
5.4
7.33
8.72
8.48
9.61
7.5
7.13
7.81
8.83
8.92
8.12
7.92
7.78
7.79
8.0
7.89
7.51
7.15
6.85
7.50
8.30
7.15
7.14
7.07
7.56
7.59
7.19
7.21
8.17
5.78
7.44
7.4
5.9
TW4-12
Sampling Event
TABLE 1 (15 of 33)
Historic Summary Of Mon~oring Well Analytical Results Up To The 2nd Quarter 2022
Chloroform Contamination Investigation
DUSA White Mesa Mill
Parameter
IGWQSI
Carbon Tetrachloride Chloroform Chloromethane Methylene Chloride Chloride
(5 µg/Ll 170 ua/LI 130 uo/LI 15 uo/LI No GWQS Imo/LI
1stQtr 3/16/2005 NA <1.0 NA
2ndQtr 5/25/2005 NA <1.0 NA
3rd Qtr 8/31/2005 <1.0 <1.0
4th Qtr 1217/2005 <1.0 <1.0
1stQtr 3/9/2006 <1,0 <1.0
2ndQtr 6/14/2006 <1.0 <1.0
3rd Qtr 712012006 <1.0 <1.0
4th Qtr 11/8/2006 <1.0 <1.0 <1.0
1stQtr 2/28/2007 <1.0 <1.0 <1.0
2ndQtr 6/27/2007 <1.0 <1.0 <1.0
3rdQtr 8/15/2007 <1.0 <1.0 <1.0
4thQtr 10/10/2007 <1.0 <1.0 <1.0
1stQtr 3/28/2008 <1.0 <1.0 <1.0
2ndQtr 6/25/2008 <1.0 <1.0 <1.0
3rd Qtr 9/10/2008 <1.0 <1.0 <1.0
4th.Ott ..... 10/15/2008 <1.0 <1.0 <1.0
1stQtr 3/11/2009 <1.0 <1.0 <1.0
2ndQtr 6/23/2009 <1.0 <1.0 <1.0
3rdQtr 9/14/2009 <1,0 <1.0 <1.0
4th0tr 12/16/2009 <1.0 <1.0 <1.0
1stQtr 2/23/2010 <1.0 <1.0 <1,0
2ndQtr 6/14/2010 <1.0 <1.0 <1.0
3rd Qtr 8/10/2010 <1.0 <1.0 <1.0
4th Qtr 10/15/2010 <1.0 <1.0 <1.0
1stQtr 2/15/2011 <1.0 <1.0 <1.0
2ndQtr 5/25/2011 <1.0 <1.0 <1,0
3rd Qtr 8/16/2011 <1,0 <1.0 <1.0
4th Qtr 11/15/2011 <1.0 <1.0 <1.0
'1sfCiii"('f) 1/17/2012 <1,0 <1.0 <1.0
2nd Qtr ---5/31/2012 <1.0 ---<i':o ____ ~1.0
3rdQtr 8/29/2012 <1.0 <1.0 <1.0
4thQtr 10/3/2012 <1.0 <1.0 <1.0
1stQtr 2/13/2013 <1.0 <1.0 <1.0
2nd Qtr 5/29/2013 <1.0 <1.0 <1.0
3rdQtr 8/29/2013 <1.0 <1.0 <1.0
4thQtr 11/6/2013 <1.0 <1.0 <1.0
1stQtr 1/22/2014 <1.0 <1.0 <1.0
2nd Qtr 5/21/2014 <1.0 <1,0 <1.0
3rdQtr 8/27/2014 <1.0 <1.0 <1.0
4thQtr 10/23/2014 <1.0 <1.0 <1.0
1stQtr 3/11/2015 <1.0 <1,0 <i'.o
2nd Qtr 6/10/2015 <1.0 <1.0 <1.0
3rdQtr 9/2/2015 <1.0 <1.0 <1.0
4thQtr 10/21/2015 <1.0 <1.0 <1.0
Oeollcate TW4-65 <1.0 <1.0 <1.0
istQtr 3/15/2016 -.-i.o <1.0 <1.0
2nd Qtr 5/25/2016 <1.0 <1.0 <1.0
Dtpllca!ITWA.( 5/25/2016 <1.0 <1.0 <1.0
3rdQtr 7/27/2016 <1.0 <1.0 <1.0
4thQtr 10/12/2016 <1.0 <1.0 <1.0
is1a1r 3/14/2017 <1.0 <1.0 <1.0
2nd Qtr 6/14/2017 <1.0 1.25 <1.0
3rdQtr 8/2/2017 <1,0 1.2 <1.0
Depl1cate TW4-70 <1.0 1.19 <1.0
4thQtr 10/10/2017 <1.0 <1.0 <1.0
Oepiicate TW4-70 <1.0 <1.0 <1.0
1st0tr 3/14/2018 <1.0 <1.0 <1.0
2nd Qtr 6/12/2018 <1.0 <1.0 <1.0
3rdQtr 8/29/2018 <1.0 <1.0 <1.0
4th Qtr 11/30/2018 <1.0 <1.0 <1.0
1sIQtr . <1.0 3/16/2019 <1.0 <1.0
2nd Qtr 6/13/2019 <1.0 <1.0 <1.0
3rdQtr 9/11/2019 <1.0 <1.0 <1.0
4thQtr 12/14/2019 <1.0 <1.0 <1.0
1stQtr 3/17/202Ci' <1.0 <1.0 <1.0
2nd Qtr 6/11/2020 <1.0 <1.0 <1.0
3rdQtr 9/17/2020 <1.0 <1.0 <1.0
4thQtr 11/4/2020 <1.0 <1.0 <1.0
·i'si'Otr 3/17/2021 <1,0 <1.0 <1.0
2nd Qtr 6/15/2021 <1.0 <1.0 <1.0
3rdQtr 9/15/2021 <1.0 <1.0 <1.0
4thQtr 12m2021 <1.0 <1.0 <1.0
1stQtr 3/15/2022 <1.0 <1.0 <1.0
2ndQtr 6/15/2022 <1.0 <1.0 <1.0
(1) As of March 2012 both north and south wild Ille ponds no lon,1er rece1v1!!11 water
NA = not analyzed
Shaded indicates concentrat1ons exceeding GWQS.
NA NA
NA NA
5.8 <1.0 NA
1.0 <1.0 19
2.6 <1.0 19
1.4 <1.0 16
1.4 <1.0 16
<1.0 16
<1.0 16
<1.0 18
<1.0 29
<1.0 16
<1.0 16
<1.0 19
<1.0 18
<1.0 22
<1.0 ;fa
<1.0 22
<1.0 22
<1.0 23 ~-,·o 22
<1.0 29
<1.0 35
<1.0 31
<1.0 31
<1.0 32
<1.0 31
<1.0 30
<1.0 :is <1.0 ----------------34
<1.0 39
<1.0 39
<1.0 36.7
<1.0 38.6
<1.0 41.7
<1.0 41.4
<1.0 41.6
<1.0 40.2
<1.0 47
<1.0 50.2
<1.0 50,6
<1.0 56
<1.0 60.2
<1.0 51
<1 .0 51.3 ------------<1.0 56.2
<1.0 66.4
<1.0 67
<1.0 67.5
<1.0 72.6
<1.0 62.6
<1.0 67.2
<1.0 65.3
<1.0 67
<1.0 56.2
<1.0 61.4
<1.0 59.'5
<1.0 53.6
<1.0 59.9
<1.0 56.1
<1.0 50.8
<1.0 55.3
<1.0 52.6
<1.0 58.0
<1.0 53.ci
<1.0 51.7
<1.0 50.3
<1.0 48.0
<1.0 52.0
<1.0 51.8
<1.0 36.1
<1.0 49.8
<1.0 25.8
<1.0 53.3
Nitrate, Nitrate + Nitrite
l10mn/LI
1.4
1.6
1.5
1.4
1.3
1.4
1.4
1.4
15
1.5
1.4
1.4
1.6
2.7
2.7
2.5
2.4
3.8
5.1
3.6
4.0
110
9.0
8.0
6.5
7.0
6.8
8.0
-----------!7 100
13 0
13 0 .. 126
14 2
17 4
16.4
18 4'
170
13 0
161
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
101
8.31
8.88
8.04
6.39
4.95
2.34
5.91
3.10
2.39
1.95
1.46 84
16.0
TABLE 1 (16 of 33)
Historic Summary Of Monitoring Well Analytical Results Up To The 2nd Quarter 2022
Chloroform Contamination Investigation
OUSA White Mesa Mill
TW4-13 Parameter
Sampling Event IGWQS)
Carbon Tetrachloride Chloroform Chloromethane Methylene Chloride
(5 ualLl f70 ua/L\ f30 un/L\ 15 ua/Ll
1stQtr 3/16/2005 NA <1.0 NA NA
2nd Qtr 5/25/2005 NA <1.0 NA NA
3rdQtr 8/31/2005 <1.0 <1.0 3.1 <1.0
4th Qtr 12m2005 <1.0 <1.0 <1.0 <1.0
1stQtr 3/9/2006 <1.0 <1.0 1.7 <1.0
2nd Qtr 6/1412006 <1.0 <1.0 1.4 <1.0
3rdQtr 7120/2006 <1.0 <1.0 <1.0 <1.0
4thQtr 111812006 <1.0 <1.0 <1.0 <1.0
1stQtr 2128/2007 . <1.0 <1.0 <1.0 <1.0
2nd Qtr 612712007 <1.0 <1.0 <1.0 <1.0
3rdQtr 811512007 <1.0 <1.0 <1.0 <1 .0
4th_Qtr 10/10/2007 <1.0 <1.0 <1.0 <1.0
1stQtr 3/2812008 <1.0 <1.0 <1,0 <1.0
2ndQtr 6/25/2008 <1.0 <1.0 <1.0 <1 .0
3rdQtr 9/10/2008 <1.0 <1.0 <1.0 <1.0
4th Qtr · 1011512008 <1.0 <1.0 • <1.0 <1.0
1stQtr 3/412009 <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 12/16/2009 <1.0 <1.0 <1.0 <1.0
1stQtr V24/2010 <1.0 <1.0 <1.0 <1 .0
2ndQtr 6/14/2010 <1.0 <1.0 <1.0 <1.0
3rd Qtr 8/10/2010 <1.0 <1.0 <1.0 <1.0
4th Qtr 10/15/2010 <1.0 <1.0 <1.0 <1.0
1stQtr 2/15/2011 <1.0 <1.0 <1.0 <1.0
2ndQtr 5/25/2011 <1.0 <1.0 <1.0 <1.0
3rd Qtr 811612011 <1.0 <1.0 <1.0 <1.0
4th Qtr 11/15/2011 <1.0 <1.0 <1.0 <1.0
1st Otr (1) 1/17/2012 <1.0 <1.0 <1.0 <1.0
2nd Qtr ---5/31/2012 <1.0 ---<fO ____ 1---------<1.0 -<1.0
3rd Qtr 8/29/2012 <1.0 <1.0 <1.0 <1.0
4th Qtr 10/3/2012 <1.0 <1.0 <1.0 <1.0
1st0tr 2/13/2013 <1.0 <1.0 <1.0 <1.0
2ndQtr 5/29/2013 <1.0 <1.0 <1.0 <1.0
3rdQtr 8/29/2013 <1.0 <1.0 <1.0 <1.0
4th Qtr 11/612013 <1.0 <1.0 <1.0 <1.0
1stQtr 1/2V20J4 <1.0 <1.0 <1.0 <1.0
2ndQtr 5/21/2014 <1.0 <1.0 <1.0 <1 .0
3rd Qtr 8123/2014 <1.0 <1.0 <1.0 <1 .0
4th.Ctr 10/23/2014 <1.0 <1.0 <1.0 <1 .0
1stQtr 3/11/2015 <1.0 <1.0 <1.0 <1.0
2ndQtr 6/10/2015 <1.0 <1.0 <1.0 <1.0
3rd Qtr 9/2/2015 <1.0 <1.0 <1.0 <1 .0
4thQtr 10121/2015 <1.0 <1.0 <1.0 <1.0
1stQtr 3116/2016 <1.0 <1.0 ~To ~-i.o
2nd Qtr 5/25/2016 <1.0 <1.0 <1.0 <1.0
3rd Qtr 7/28/2016 <1.0 <1.0 <1.0 <1.0
4thQtr 10/19/2016 <1.0 <1.0 <1.0 <1.0
1stQtr 3/16/2017 <1.0 <1.0 <1.0 <1.0
2ndQtr 6/15/2017 <1.0 <1.0 <1.0 <1.0
3rdQtr 8/2/2017 <1.0 <1.0 <1.0 <1.0
4thQtr 10/10/2017 <1.0 <1.0 <1.0 <1.0
1stQtr 3114/2018 <1.0 <1.0 <1.0 <1.0
2nd Qtr 6/1V2018 <1.0 <1.0 <1.0 <1.0
3rdQtr 8129/2018 <1.0 <1.0 <1.0 <1.0
4thQtr 11/30/2018 <1.0 <1.0 <1.0 <1.0
1stQtr 3/16/2019 <1.0 <1.0 <1.0 <1.0
2nd Qtr 6/13/2019 <1.0 <1.0 <1.0 <1.0
3rdQtr 9/11/2019 <1.0 <1.0 <1.0 <1.0
4thQtr 12114/2019 <1.0 <1.0 <1.0 <1.0
·1stQtr 3/17/20.20 <1.0 <1.0 <1.0 <1.0
2nd Qtr 6/1112020 <1.0 <1.0 <1.0 <1.0
3rdQtr 9/1712020 <1.0 <1.0 <1.0 <1.0
4thQtr 11/412020 <1.0 <1.0 <1.0 <1.0
1stQtr 3/1712021 <1.0 <1.0 <1.0 <1.0
2nd Qtr 6/15/2021 <1.0 <1.0 <1.0 <1.0
3rdQtr 9115/2021 <1.0 <1.0 <1.0 <1.0
4th Qtr 12/712021 <1.0 <1.0 <1.0 <1.0
isi°a1r 3/16/2022 <1.0 <1.0 <1.0 <1.0
2nd Qtr 6/15/2022 <1.0 <1.0 <1.0 <1.0
,11) As of March 2012 both north and south wild life ponds no lon_2!r rece1v1!!9 water
NA = not analyzed
Shaded indicates concentrations exceeding GWOS.
Chloride
No GWQS (ma/Ll
NA
NA
NA
69
67
66
65
33
59
59
58
58
54
58
50
58
58
57
63
60
53
53
55
55
60
56
60
54
55 ---------59
60
60
59.3
56
63.5
58.5
63.1
56.1
62
66.1
664
70.3
76.5
65.5
69.4
71.8 -69.3
70.9
66.0
70.4
70.5
60.9
71.0
65.0
73.7
64.5
61.6
65.4
65.3
68.7
63.9
62.7
60.2
60.6
67.3
57.7
54.2
61.0
59.2
62.6
Nitrate, Nitrate + Nitrite
110 ma/Ll
4.2
4.3
4.6
4.3
4.2
4.9
4.3
0.8
4.0
4.6
4.4
4.1
3.8
4.2
4.3
4.6
3.7
1.2
4.7
4.1
4.3
5.2
5.6
5.8
5.5
6.4
5.2
5.9
5.5
6.0
6.2
5.9.
6.31
6.8
7.16
6.48
7.09
5.99
4.8
6.28
7.09
6.32
5.7
5.78
7.97
5.87
6.14
6.20
6.05
6.49
6.15
6.17
5.76
6.24
5.13
5.29
5.74
6.56
5.19
5.17
5.5
9.0
5.25
4.92
5.57
2.9
4.80
5.06
4.80
4.5
TW4-14
Sampling Event
TABLE 1 (17 of 33)
Historic Summary Of Monitoring Well Analytical Results Up To The 2nd Quarter 2022
Chloroform Contamination Investigation
DUSA White Mesa Mill
Parameter
(GWQSl
Carbon Tetrachloride Chloroform Chloromethane Methylene Chloride Chloride
(5 ua/LI 170 ua/Ll (30 ua/Ll 15 ua/LI No GWQS Ima/LI
Nitrate, Nitrate + Nitrite
110 ma/LI
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
4thQtr 12/7/2005 NS NS NS~ ___ __,NS~------1"-'N~S _____ -"N-"S~-------'
1 st Qtr 319/2006 Iis NS NS ·Ns NS NS
2nd Qtr 6/14/2006 NS NS NS NS NS NS
3rd Qtr 7/2012006 NS NS NS NS NS NS i~~g:~ ~~:;~~ :;~ ~f"'·.o~--+:-'-~"'.~'-----+-'-:;'"•"-~---·----4--------"~~1--------=~~~
2nd Otr 6/2712007 <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
4th Qtr 10/10/2007 <1.0 <1.0 <1.0 <1.0 38 0.8
1stQtr 3/28/2008 <1.0 <1.0 <1.0 <1.0 57 0.4
2nd Qtr 6/25/2008 <1.0 <1.0 <1.0 <1.0 35 1.6
3rd Qtr 9/10/2008 <1.0 <1.0 <1.0 <1.0 34 1.38
4th Qtr ....... 10/15/2008 <1.0 <1.0 <1.0 <1 .0 40 0.76
1st Qtr 3/4/2009 <1.0 <1.0 <1.0 <1 .0 35 1.6
2nd Qtr 6/23/2009 <1.0 <1.0 <1.0 <1.0 36 1.4
3rd Otr 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
1stOtr 3/23/2010 <1.0 <1.0 <1.0 <1.0 33 2.5
2nd Qtr 6/14/2010 <1.0 <1.0 <1.0 <1.0 49 2.9
3rd Qtr 8/10/2010 <1.0 <1.0 <1.0 <1.0 35 2.8
4th Qtr 10/15/2010 <1.0 <1.0 <1.0 <1.0 29 2.9
1stQtr 2/15/2011 <1.0 <1.0 <1.0 <1.0 25 1.8
2nd Otr 6/2412011 <1.0 <1.0 <1.0 <1.0 24 1.4
3rdQtr 8/16/2011 <1.0 <1.0 <1.0 <1.0 33 2.6
4th Otr 11/15/2011 <1.0 <1.0 <1.0 <1.0 15 1.7
1stCitr(1) 1/17/2012 <!,~ _________ .::!.:.~ ____ _:;!.:_~------<1.0 _________ 2305 1.9
2nd Otr 6/14/2012 <1.0 <1.0 <1.0 <1.0 3.3
3rd Qtr 8/29/2012 <1.0 <1.0 <1.0 <1.0 37 3.9
4th Qtr 10/3/2012 <1.0 <1.0 <1.0 <1.0 37 3.9
"istQtr 217/201 3 <1.0 <1.0 <1.0 <1.0 35.2 4:e·
2nd Qtr 5/29/2013 <1.0 <1.0 <1.0 <1.0 38.6 4.4
3rd Qtr 812912013 <1.0 <1.0 <1.0 <1.0 37.6 4.51
4th Otr 11/6/2013 <1.0 <1.0 <1.0 <1.0 36.5 4.81
1st utr 1/22/2014 <1.0 <1.0 <1.0 <1.0 35.5 5.92
2nd Otr 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
·i°st Otr 3/12/2015 <1.0 1.7 <1.0 <1.0 40:1 5.22
2nd Otr 6/10/2015 <1.0 1.82 <1.0 <1.0 41.8 3.55
3rd Qtr 9/3/2015 <1.0 <1.0 <1.0 <1.0 42.4 2.77
4th Qtr 10123/2015 <1.0 1.46 <1,~.0~----<.-<~1~.0'-_____ ,__ _____ ~4"-0~.6.._ ______ ~2~.4~5;,
1st Otr 3/16/2016 ·.;•,.o 4.49 .;·i.o 2.18 42.4 2.94
2nd Qtr 5126/2016 <1.0 6.15 <1.0 3.18 43.6 2.45
3rd Otr 813/2016 <1.0 5 <1.0 1.8 42.4 2.88
4th Qtr 10/20/2016 <1.0 7.02 <1.0 1.59 45.6!-______ _.2"'.8"'6'1
·,-,"i--otr 311512011 <1.0 6.45 <1.0 2.18 4!f 4 4.3e
2nd Qtr 6115/2017 <1.0 6.85 <1.0 <1 .0 46.9 5.12
3rd Qtr 8/2/2017 <1.0 6.14 <1.0 <1.0 46.4 4.84
4thQtr 10110/2017 <1.0 6.13 <1.0 <1.0 42.5 4.73
1st Otr 3/15/2018 <1.0 5.8 <1.0 2.18 51.5 5.67
2nd Qtr 6113/2018 <1.0 5.12 <1.0 <1.0 46.9 6.36
3rd Qtr 8130/2018 <1.0 4.76 <1.0 <1 .0 54.1 5.34
4th Otr 12/1212018 <1.0 4.41 <1.0 <1 .0 48.7 5.85
1stQtr 3/1612019 <1.0 4.08 <1.0 <1.0 48.7 6.16
2nd Otr 6/13/2019 <1.0 4.18 <1.0 <1.0 48.3 5.86
3rd Qtr 9/11/2019 <1.0 6.08 <1.0 <1.0 45.4 4.77
4th Otr 12/14/2019 <1.0 3.83 <1.0 <1.0 49.4 4.76
1stOtr 3/17/2020 <1.0 2.98 <1.0 <1 .0 48.4 6.17
2nd Qtr 6/1112020 <1.0 2.87 <1.0 <1.0 47.6 6·.57
3rd Otr 9/1812020 <1.0 2.41 <1.0 <1 .0 45.1 5.57
4th Qtr 11/412020 <1.0 2.69 <1.0 <1.0 49.7 5.81
1stQtr 311812021 <1.0 1.77 <1.0 <1.0 48.2 5.56
2nd Qtr 6/1612021 <1.0 <1.0 <1.0 <1.0 49.5 7.02
3rd Otr 9/1512021 <1.0 <1.0 <1.0 <1.0 34.1 5.56
4th Qtr 12/8/2021 <1.0 <1.0 <1.0 <1.0 49.0 5.70
1stQtr 3/1612022 <1.0 <1.0 <1.0 <1.0 42.0 5.9
2nd Otr 611612022 <1.0 1.0 <1.0 <1.0 48.4 5.300
11.L~~~a_!:~2,2.12 both north and south WIid life ponds no lon.2,_er rece1V1!!1J water
NS = not sampled
Shaded indicates concentrations exceeding GWQS.
TW4-16
Sampling Event
TABLE 1 (18 of 33)
Historic Summary Of Monrtoring Well Analytical Results Up To The 2nd Quarter 2022
Chloroform Contamination Investigation
Carbon Tetrachloride
15 ua/Ll
Chloroform
170 ua/Ll
DUSA White Mesa Mill
Chloromethane
(30 un/LI
Parameter
IGWQSl
Methylene Chloride
15 ua/Ll
Chloride
No GWQS Imo/LI
Nitrate, Nitrate + Nrtrite
110 mo/Ll
1st Qtr 3/16/2005 NA 240 NA NA NA <0.1
2nd Qtr 5/25/2005 NA 212 NA NA NA <0.1
3rd Qtr 8/31/2005 <1.0 85 3.2 43 NA <0.1
4th Qtr 12/7/2005 <1.0 14 2.6 5 9 64 1 4 ·,"'s'-t Q,;.::.tr---~3,"9"12;c'o-o'06=-1-'<'!1'-".o'-------+----3='9cl-------=1"'.1'+--------'2~· ,e+---------o'60~--------'\i
2nd Qtr 6/14/2006 <1.0 13 2.4 8.9 55 1.9
3rd Qtr 7/20/2006 <1.0 5.2 <1.0 2.7 60 2.7
lc4"'th,_Qc=tr ___ _,_1c;1/""'8/2006 <1.0 13.6 <1.0 9.2 62 5.6
1st Qtr 2/28/2007 <1.0 8.7 <1.0 6.6 79 12.3
2nd Qtr 6/27/2007 <1.0 2.6 <1.0 1.8 75 9.9
3rd Qtr 8/15/2007 <1.0 7.1 <1.0 5.1 65 5.4
4th Qtr 10/10/2007 <1.0 1.4 <1.0 1 69 4.4
1stQtr 3/28/2008 <1.0 11 <1.0 26 52 <0.1
<1.0 2nd Qtr 6/25/2008 <1.0 <1.0 <1.0 58 1.5
14 3rd Qtr 9/10/2008 <1.0 10 <1.0 71 10.5
4th_Q"-tr __ ~10,::,i.,_,15,ci2"'0""0"'81-<'-'1'-'.0'-------+----"3'-'.9'!-<-'-1'-".0,c__ ___ -+------'=!-------"8"-91--------"'9.8 1st Qtr 3/4/2009 <1.0 <1.0 <1.0 73 9.6
6.6
<1.0
<1.0 2nd Qtr 6/23/2009 <1.0 <1.0 <1.0 76 8.9
<1.0 3rd Qtr 9/14/2009 <1.0 <1.0 <1.0 79 8.8
'"'i~~~'-g=:~;--~,=~;~~'-;;~~"'g=~~-:; g :; g :; g ;~ !~ <1.0
<1.0
<1.0 2nd Qtr 6/14/2010 <1.0 2. 1 <1.0 64 4.7
<1.0 3rd Qtr 8/24/2010 <1.0 4.3 <1.0 72 4.6
<1.0 4th Qtr 10/15/2010 <1.0 3 <1.0 71 3.3
1stQtr
2nd Qtr
3rdQtr
4thQtr
<1.0 2/22/2011 <1.0 15 <1.0 86 7
5/26/2011 <1.0 16 <1.0 81 5 <1.0
<1.0 8/17/2011 <1.0 9.2 <1.0 63 1.7
NA 11/16/2011 NA NA NA 38 0.4
(1) 12/7/2011 <1.0 <1.0 <1.0 1.4 NA
1staOtr(3L__ 1/18/2012 <1.0 ,:!.:!!... ____ ,:!.:I!...______ 1.7 ___ _ 4583 <0.i ________ 12;1 -2nd tr 5/26/2012 <1.0 <1.0 <1.0 <1.0
<1.0 3rd Qtr 8/30/2012 <1.0 <1.0 <1.0 59 <0.1
4th Qtr 10/3/2012 <1.0 <1.0 <1c,,.0'-------+-'-""---------!--------"59,q..:<:s0"-'.1'----------I 1stQtr 217/2013 <1.0 <1.0 ~-,·.o 58.1 <0.1
<1.0
<1.0
4.21 2nd Qtr 5/30/2013 <1.0 <1.0 <1.0 49.8 <0.1
<1.0 3rd Qtr 9/5/2013 <1.0 <1.0 <1.0 54.4 <0.1
<1.0 4th Qtr 1117/2013 <1.0 13.4 <1.0 56.6 1.37
1st Qtr 1/29i2014 <1.0 6.93 <1.0 66.8 3.16 <1.0
<1.0 2nd Qtr 5/22/2014 <1.0 14.6 <1.0 80.7 4.94
<1.0 3rd Qtr (2) 8/14/2014 <1.0 229 <1.0 80 5. 1
<1.0 3rd Qtr 9/24/2014 <1.0 371 <1.0 NA NA i~ g: ,~~~g;: :; g ~:~ ~1"g'-------+-""-------+-------9"'2"'"s5,;.11--------~"".-'-lj <1.0
<1.0
<1.0 2nd Qtr 6/11/2015 <1.0 65.3 <1.0 61 1.06
<1.0 3rdQtr 9/3/2015 <1.0 82 <1.0 65.8 1.18
<1.0 4th Qtr 10/28/2015 <1.0 112 <1.0 58.3 1.69
<1.0 1st Qtr 3/17/2016 <1.0 45.9 <1.0 56.5 1.63
<1.0 2nd Qtr 5/26/2016 <1.0 93.4 <1.0 61 .3 1.89
<1.0 3rd Qtr 8/3/2016 <1.0 49 <1.0 60 2.20
.,4,.,,th,_Qc=tr __ _,1.,,01"'2"'6"'/2"'0-'-16"+-<'-'1'-'.o'--------+---'9"2"".94--<_,_1."'0------+-""------+-------'66"".71---------"'2.ce78 1stQtr 3/16/2017 <1.0 19.1 <1.0 62:·2 2.75
<1.0
<1.0
<1.0 2nd Qtr 6/20/2017 <1.0 64.3 <1.0 60.6 1.81
<1.0 3rd Qtr 8/3/2017 <1.0 143 <1.0 67.1 2.63
<1.0 4th Qtr 10/11/2017 <1.0 98 <1.0 54.2 2.12
ieDC!;We,MecR"'C"s"'oll,,_;it S,eae,m,..,,,,,.. __ -..j,.:<:,,0"'.9"'5 ______ 1-___ 9:,2e.j..:<.!.1 . .,,_5 ____ --+-------'"'--'4--------6"'41---------=2'-'.00 1stQtr 3/20/2018 <1.0 170 <1.0 85.i. 4.55
1.9 J
<1.0
DupticateTW4-75 <1.0 171 <1.0 84.7 4.51
2nd Qtr 6/14/2018 <1.0 54.5 <1.0 62.5 2.83
<1.0
<1.0
<1.0 3rd Qtr 8/30/2018 <1.0 54.5 <1 .0 73 2.53
<1.0 4th Qtr 12/12/2018 <1.0 52.0 <1.0 68.8 2.88
<1.0 1st Qtr 3/19/2019 <1.0 60.6 <1 .0 66.3 3.36
<1.0 2nd Qtr 6/19/2019 <1.0 76.2 <1 .0 71.5 2.43
3rd Qtr 9/12/2019 <1.0 99.8 <1.0 72.9 3.55 <1.0
<1.0 4th Qtr 12/14/2019 <1.0 94.3 <1.0 88.6 3.37
<1.0 ~.P.!~~.ateTW4-75 <1.0 91.0 <1.0 84.1 3.12
1st Qtr 3/18/2020 <1.0 113 <1.0 76.2 3.91 <1.0
2nd Qtr 6/12/2020 <1.0 141 <1.0 <1.0 79.7 4.44
3rd Qtr 9/19/2020 <1.0 220 <1.0 <1.0 77.4 4.74
4th Qtr 11/11/2020 <1.0 270 <1.0 <1.0 85.9 5.73
OupHcateTW4-75 <1.0 277 <1.0 <1.0 85.6 5.74
DWMRC_spjit_sampJe <10 290 <20 <20 87.0 0.37 H
1st Qtr 3/24/2021 <1.0 248 <1.0 <1.0 92.6 5.82
2nd Qtr 6/17/2021 <1.0 247 <1.0 <1.0 87.4 6.74
3rd Qtr 9/23/2021 <1.0 202 <1.0 <1.0 77.4 4.74 ;~g: ~t~~;~g~i :;g ;:~ H "'g'------+-=-:;c'•-o'g------1------:~:"'•=-~1--------"4'='s8'=1~1
2nd Qtr 6/22/2022 <1.0 120 <1.0 <1.0 93.2 4.2
(1) voes were resampled because laboratory missed holding time.
(2) voes were resampled (3) As of March 2012 both north and south wild life ponds no longer receiving water.
NA = not anatyzed
Shaded indicates concentrations exceeding GWQS.
J = Approximate value
H = Sample was analyzed beyond holding !Imes and may not be accureate concentration.
TABLE 1 (19 of 33)
Historic Summary Of Monitoring Well Analytical Results Up To The 2nd Quarter 2022
Chloroform Contamination Investigation
TW4-18
Sampling Event
DUSA White Mesa Mill
Parameter
IGWQS)
Carbon Tetrachloride
15 ua/U
Chloroform Chloromethane Methylene Chloride Chloride Nitrate, Nitrate + Nitrite
110 mo/LI 170 ua/U 130 ua/U (5 uo/L) No GWQS (moll)
1st Qtr 3/16/2005 NA 38 NA NA NA 14.1
2nd Qtr 5/25/2005 NA 29.8 NA NA NA 12.9
3rd Qtr 8/31/2005 <1.0 39 2.8 <1.0 NA 13.3
4th Otr 12m 2005 <1.0 14 1.1 <1.0 41 7.3
1st Qtr 3/9/2006 <1.0 12 1.6 <1.0 36 5.9
2nd Qtr 6/14/2006 <1.0 12 2.7 <1.0 35 4.7
3rd Qtr 7/20/2006 <1.0 10.8 <1.0 <1.0 35 6.1
4th Qtr 11/8/2006 <1.0 12.5 <1.0 <1.0 34 5.7
1stQtr 2/28/2007 <1.0 9.2 <1.0 <1.0 30 5.1
2nd Qtr 6/27/2007 <1.0 8 <1.0 <1.0 28 4.9
3rd Qtr 8/15/2007 <1.0 8.9 <1.0 <1.0 32 5.0
4th Qtr 10/10/2007 <1.0 7.4 <1.0 <1.0 27 4.4
1stQtr 3/28/2008 <1.0 6.4 <1.0 <1.0 23 0.7
2nd Qtr 6/25/2008 <1.0 5.7 <1.0 <1.0 23 4.6
3rd Qtr 9/10/2008 <1.0 8 <1.0 <1.0 26 4.9
4th Qtr 10/15/2008 <1.0 9.4 <1.0 <1.0 30 5.2
1stQtr 3/4/2009 <1.0 11 <1.0 <1.0 29 5.2
2nd Qtr 6/23/2009 <1.0 16 <1.0 <1.0 30 6.2
3rd Qtr 9/14/2009 <1.0 13 <1.0 <1.0 26 5.9
4th Qtr 12/17/20091-<:_:1_,.0'-------+----'8"".2e.i-:<'-'-1"".0'-----+-'-<1,c..,,_0 ______ --l-------"30"l-________ 5,c."14I
1stQtr 3/24/2010 <1.0 69 <1.0 <1.0 41 5.1
2nd Qtr 6/14/2010 <1.0 29 <1.0 <1.0 35 9.0
3rd Qtr 8/12/2010 <1.0 29 <1.0 <1.0 37 9.0
4th Qtr 10/15/2010 <1.0 30 <1.0 <1.0 50 10.0
1stQtr 2/22/2011 <1.0 39 <1.0 <1.0 52 10.0
2nd Otr 5/26/2011 <1.0 26 <1.0 <1.0 36 9.0
3rd Qtr 8/17/2011 <1.0 29 <1.0 <1.0 23 4.6
4th Qtr 11/16/2011 NA NA NA NA 23 6.3
fsfCifrU/ ... ;~,1'.~"'g";2.;..11-:c:;.a.;.g'-------+----~;,~c1 .... -=:'-'-;"'g'--_-_-_-_-_-_-+:..:.;,c.g,c_ _____ -+"N"'A'------,8+N"'A'--------4-.--il4
2nd Qtr 6/13/2012 <1.0 --24 <1.0 <1.0 -----------------30 6.6
3rd Qtr 9/11/2012 <1.0 38 <1.0 <1.0 26 6.6
4th Qtr 10/3/2012 <1.0 30 <1.0 <1.0 27 6.0
1st Qtr 2/13/2013 <1.0 34:s· <1.0 <1.0 23.1 5.6
2nd Qtr 6/13/2013 <1.0 37.9 <1.0 <1.0 22.9 8.9
3rdQtr 9/5/2013 <1.0 41 <1.0 <1.0 36.2 12.1
4th Qtr 11/13/2013 <1.0 44.3 <1.0 <1.0 37.1 14.2
1st Qtr 1/30/2014 <1.0 6.93 <1.0 <1.0 38.9 12.8
2nd Qtr 5/22/2014 <1.0 6.93 <1.0 <1.0 47 12.2
3rd Qtr 8/14/2014 <1.0 32.8 <1.0 <1.0 49 9.8
4th Qtr 10/28/2014 <1.0 33 <1.0 <1.0 40.8 11.1
1stQtr 3/12/2015 <1.0 32 <1.0 <1.0 41.6 11.7
2nd Qtr 6/11/2015 <1.0 30.5 <1.0 <1.0 43.5 9.69
3rd Qtr 9/3/2015 <1.0 28.7 <1.0 <1.0 47.6 15.7
i.:,4ceth,_Q,.t,,_r ___ _,1.,,0/c,2.,,8/c,2.,,0-"15"l-<'-'-1"'.0'-------1---5562 .. 69 <<11,c•.o><.0 ____ -l-<:_:1_,.0:._ ______ +-_____ _,3,,,9c:.4+-______ _,6"-.2e:4'1
1stQtr 3/17/2016 <1.0 <1.0 40.7 5.96
2nd Qtr 6/8/2016 <1.0 60 <1.0 <1.0 43.8 5.45
3rd Qtr 8/3/2016 <1.0 56.3 <1.0 <1.0 40.7 5.79
4th Otr 10/26/2016 <1.0 60.1 <1.0 <1.0 43.9+-______ _,5.24
1stQtr 3/16/2017 <1.0 62 <1.0 <1.0 3f4 4.47
Duplicate TW4-75
2ndQtr
3rd Qtr
<1.0
6/20/2017 <1.0
8/3/2017 <1.0
Duplicate TW4-75 <1.0
4th Qtr 10/11/2017 <1.0
1stQtr 3/15/2018 <1.0
2nd Qtr 6/13/2018 <1.0
3rd Qtr 8/30/2018 <1.0
4th Qtr 12/13/2018 <1.0
1stQtr 3/19/2019 <1.0
2nd Qtr 6/19/2019 <1.0
Duplicate TW4-75
3rd Qtr
4thQtr
1stQtr
2nd Qtr
3rd Qtr
4thQtr
<1.0
9/11/2019 <1.0
12/18/2019 <1.0
3/18/2020 <1.0
6/12/2020 <1.0
9/18/2020 <1.0
11/11/2020 <1.0
DWMRC S[lit samcle <10
1st Qtr 3/18/2021 <1.0
2nd Qtr 6/16/2021 <1.0
3rd Qtr 9/22/2021 <1.0
4th Qtr 12/8/2021 <1.0
1st Qtr 3/23/2022 <1.0
2nd Qtr 6/22/2022 < 1. 0
61.5 <1.0 <1.0 41.1 4.41
63.8 <1.0 <1.0 41.6 4.50
62.8 <1.0 <1.0 40.4 4.24
62.3 <1.0 <1.0 41.5 4.31
62.9 <1.0 <1.0 37.1 4.43
62.3 <1.0 <1.0 44.3 4.32
59.9 <1.0 <1.0 39.5 4.09
56.2 <1.0 <1.0 45.6 3.51
57.6 <1.0 <1.0 38.2 3.60
52.8 <1.0 <1.0 37.6 3.85
54.2 <1.0 <1.0 39.5 4.01
54.4 <1.0 <1.0 40.8 2.95
56.2 <1.0 <1.0 36.8 3.25
62.0 <1.0 <1.0 42.7 3.02
57.0 <1.0 <1.0 39.4 3.71
58.2 <1.0 <1.0 41.4 3.62
60.0 <1.0 <1.0 38.7 3.36
58.6 <1.0 <1.0 39.6 3.67
56.0 <20 <20 41 .0 3.30
52.0 <1.0 <1.0 41 .8 3.61
58.2 <1.0 <1.0 41.4 3.62
49.9 <1.0 <1.0 29.8 3.37
57.0 <1.0 <1.0 41.1 3.90
56.0 <1.0 <1.0 39.1 3.4
62.9 <1.0 <1.0 48.1 3.4
(1) VOCs were resampled because laboratory missed holding time.
(2) As of March 2012 both north and south wild life ponds no longer receiving water.
NA = not analyzed
Shaded indicates concentrations exceeding GWQS.
TABLE 1 (20 of 33)
Historic Summary Of Monitoring Well Analytical Results Up To The 2nd Quarter 2022
Chloroform Contamination Investigation
DUSA Whrte Mesa Mill
TW4-19 Parameter
(chlorofrom pumping well (GWQS) started 4/30/03)
Sampling Event Carbon Tetrachloride Chloroform Chloromethane Methylene Chloride
15 ua/Ll 170 ua/Ll 130 un/L\ 15 ua/Ll
1stQtr 3/16/2005 NA 2,200 NA NA
2nd Qtr 5/25/2005 NA 1,200 NA NA
3rdQtr 8/31/2005 <5,0 1,400 <5,0 <5.0
4th Ctr 1217/2005 <50 2,800 <50 <50
1stQtr 3/9/2006 <50 ... ... i ,200 <50 <50
2nd Qtr 6/1412006 <50 1,100 <50 <50
3rd Qtr 712012006 <50 1,120 <50 <50
4thQtr 11/8/2006 1.6 1 050 ~§ <1.0
1st Ctr 2/28/2007 1.3 1,200 <1.0 <1.0
2ndQtr 6/2712007 Did not sample
3rdQtr 8/15/2007 1.9 1,100 <1.0 <1.0
4thQtr 10/10/2007 1.9 1100 <1.0 <1.0
1st Ctr 3/2812008 2.9 1,800 <1.0 <1.0
2ndQtr 6/2512008 <1.0 1,000 <1.0 <1.0
3rd Qtr 9/1012008 8.6 3,600 <1.0 <1.0
4th Ctr 10/1512008 12 4,200 <1.0 <1.0
1st Ctr 3/412009 1.2 1,100 <1.0 <1.0
2ndQtr 6/2312009 1.2 990 <1.0 <1.0
3rd Qtr 9/1412009 15 6,600 <1.0 <1.0
4th Qtr 12/22/2009 16 4,700 <1.0 <1.0
1st Ctr 2/1712010 1.3 940 <1.0 <1.0
2nd Ctr 6/1412010 4.2 1,800 <1.0 <1.0
3rd Qtr 8/16/2010 4.9 2,000 <1.0 <1.0
4th Qtr 10/1512010 1.3 1,200 <1.0 <1.0
1stQtr 2/1712011 1i 3,400 <1.0 <1.0
2ndQtr 6/712011 8.3 4,000 <1.0 <1.0
3rd Qtr 811712011 2.1 970 <1.0 <1.0
4th Qtr 11/16/2011
1stOtrW
12/512011 5.4 2,200 <1.0 <1.0
112312012 1.5 650 <1.0 <1.0 ~---------2nd Qtr 6/612012 1,1 460 <1.0 <1.0
3rd Qtr 9/4/2012 3.5 950 <1.0 <1.0
4th Qtr 10/3/2012 4 1500 <1.0 <1.0
1stQtr 2/13/2013 5.15 4,210 <1.0 <1.0
2nd Qtr 615/2013 5.15 2,070 <1.0 <1.0
3rd Qtr 9/3/2013 20.7 8,100 <1.0 <1.0
41hQlr 10/29/2013 6.42 942 <1.0 <1.0
1st Ctr 1/27/2014 4.-□5 586 <1.0 <1.0
2ndQtr 5/19/2014 5 51 810 <1.0 <1.0
3rd Qtr 8/11/2014 1.9 1.410 8.3 <1.0
4th Qtr 10/21/2014 4,8 4,310 <1.0 <1.0
1st Ctr 319/2015 8.92 4,660 <1.0 <1.0
2nd Ctr 618/2015 2.62 1,570 <1.0 <1.0
3rd Qtr 8/31/2015 <1.0 7,860 7.78 <1.0
41hQlr 10/19/2015 12.2 7 840 5.46 <1.0 ···-···-·-------------1stQtr 3/9/2016 13.5 7,780 1.4 <1.0
2ndQtr 5/2612016 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 6640 <1.0 <1.0
1st Ctr 3/812017 3.06 1,240 <1.0 <1.0
2nd Ctr 6/13/2017 1.35 510 <1.0 <1.0
3rd Qtr 7/2612017 13.0 8,840 <1.0 <1.0
4th Qtr 10/11/2017 <1.0 129 <1.0 <1.0
1s1Qtr 3/12/2018 1.36 2,640 <1.0 <1.0
2ndQtr 6/8/2018 3.45 2,980 <1.0 <1.0
3rd Qtr 8/30/2018 2.03 1,910 <1.0 <1.0
4th Qlr 11128/2018 6.18 5,270 <1.0 <1.0
1stQtr 3/8/2019 2.43 2,050 <1.0 <1.0
2ndQtr 6/512019 15.9 11,500 <1.0 <1.0
3rd Qtr 9/4/2019 10.1 6,670 <1.0 <1.0
4th Qtr 12/10/2019 <1.0 551 <1.0 <1.0
1st Ctr 2/19/2020 13.7 8,720 5.41 <1.0
2nd Qtr 5/27/2020 10.4 7,600 <1.0 <1.0
3rd Qtr 914/2020 1.98 1,350 <1.0 <1.0
4th Qtr 10/28/2020 1.1 660 <1.0 <1.0
1stQtr 2/23/2021 8.4 6,660 5.41 <1.0
2ndQtr 619/2021 <1.0 775 <1.0 <1.0
3rd Qlr 8124/2021 7.83 4,450 1.98 1.25
4thQlr 12/112021 13.2 .. §,950 <1.0 <1.0
1stQtr 319/202°2 <1.0 654 <1.0 <1.0
2nd Qtr 618/2022 2.7 2 540 4 <1.0
(1) voes were resampted because laboratory missed holding time.
(2) As of March 2012 both north and south witd life ponds no longer receiving water. _____ •
NA = not analyzed
Bold and italics indicates the MDL exceeded the GWQS.
Shaded indicates concentrations exceeding GWQS.
Chloride
No GWQS lma/Ll
Nitrate, Nitrate + Nitrite
110 ma/Lt
NA
NA
NA
81
86
116
<0.1
5.3
5.7
4.6
4
5.2
123 4.3 ;;11---------'4'""'~
129 4.1
132 4
131 2.2
128 2.8
113 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
--------149
0.6
2.4
2.5
4.1
149
150
164
148
179
134
134
152
140
130
238
180
326
252
276
204
214
200
461
135
218
139
193
138
166
140
197
160
153
147
205
147
188
104
167
115
172
184
119
128
8.0
3.0
17,6
4,7
1.6
1.3
1.6
4.7
8.56
0.916
11.6
10.6
15.70
1.27
10.5
10.0
11,1
0.243
1.120
0.377
8.6
0.494
2.55
0.233
6.58
8.96
0.33
0.535
10.1
1.14
11,6
1.1
6.6
4.04
6.68
11.0
1.7
1.4
TABLE 1 (21 of 33)
Historic Summary Of Monitoring Well Analytical Results Up To The 2nd Quarter 2022
Chloroform Contamination Investigation
DUSA White Mesa Mill
TW4-20 Parameter
(chloroform pumping well
started 8/4/05) (GWQS)
Sampling Event Carbon Tetrachloride Chloroform Chloromethane Methylene Chloride
(5 ua/Ll (70 ua/Ll (30 ua/Ll (5 ua/Ll
1stQtr 3/16/2005 Monitor well was not installed
2nd Qtr (3) 5/25/2005 NA 39,000 NA NA
3rd Qtr 8/31/2005 <10 ---3,800 ~--------<10 <10
4th Qtr 12/7/2005 <250 19,000 <250 <250
1stQtr 3/9/2006 <500 9,200 <500 <500
2nd Qtr 6/14/2006 <500 61,000 <500 <500
3rdQtr 7120/2006 <1000 5,300 <1000 <1000
4thQtr 11/8/2006 7.1 11 000 1.9
1stQtr 2/28/2007 3.1 4,400 <1.0
2nd Qtr 6/27/2007 2.2 1,800 <1.0 <1 .0
3rd Qtr 8/15/2007 3.5 5,200 <1.0
4thQtr 10/10/2007 6.8 9 000 <1.0
1stQtr 3/28/2008 9 13,000 <1.0
2ndQtr 6/25/2008 13 30,000 <1.0
3rd Qtr 9/10/2008 15 21,000 <1.0
4th Qtr 10/15/2008 NA NA NA NA
1stQtr 3/4/2009 5.7 8,200 <1.0
2ndQtr 6/23/2009 4.9 6,800 <1.0
3rd Qtr 9/14/2009 8.4 13,000 <1.0
4thQtr 12/22/2009 14 15 000 <1.0
1stQtr 2/17/2010 2.7 3,500 <1.0
2nd Qtr 6/14/2010 11 18,000 <1.0
3rdQtr 8/16/2010 12 15,000 <1.0
4thQtr 10/15/2010 20 24 000 <1.0
1stQtr 2/17/2011 27 31,000 <1.0
2nd Otr 6/7/2011 10 8,100 <1.0
3rdQtr 8/17/2011 7.3 3,800 <1.0
4thQtr 11/16/2011 7.2 7 900 <1.0 fstCifrj2) 11231201':1' 10 11,000 <1.0
2nd Qtr --6/6/2012 ---------33 ~------<fO ______ 36,000 <1.0
3rd Qtr 9/4/2012 26 13,000 <1.0 <1.0
4th Qtr 10/3/2012 22 19 000 <1.0 .:'::J..0 1stQtr 2/11/2013 196 18,500 <1.0
2nd Qtr 6/5/2013 32.5 26,300 <1.0
3rdQtr 9/3/2013 25.7 26,800 <1.0
4thQtr 10/29/2013 17.3 15,700 <1.0
1stQtr 1/27/2014 18.4 17,800 <1.0
2nd Qtr 5/19/2014 22.1 22,100 2.31
3rdQtr 8/11/2014 14.1 12,400 55.2
4thQtr 10/21/2014 18.5 23 300 4.04
1stQtr 3/9/2015 20.8 19,900 4.85
2ndQtr 6/8/2015 16.2 17,600 13.4
3rd Qtr 8/31/2015 15.1 17,000 12.3 <1.0
4th Qtr 10/19/2015 14.5 17 000 10.8
1stQtr 3/9/2016 20.2 ·--i-i,600 4.09
2nd Qtr 5/23/2016 40.6 33,700 <1.0 <1.0
3rdQtr 7/25/2016 26.6 23,600 <1.0 <1.0
4thQtr 10/12/2016 24.4 21 300 <1.0 <1.0
1stQtr 3/8/2017 23.5 23,400 <1.0 <1.0
2nd Qtr 6/13/2017 23.4 18,100 <1.0 <1.0
3rdQtr 7/26/2017 25.0 27,600 1.25 <1.0
4thQtr 10/12/2017 11.2 11 ,600 2.34 <1.0
1stQtr 3/12/2018 15.9 15,400 1.77
2nd Qtr 6/14/2018 <1.0 12,000 <1.0
3rd Qtr 8/22/2018 9.85 10,500 4.98 <1.0
4thQtr 11/28/2018 8.32 9,500 15.6 <1.0
1stQtr 3/8/2019 15.4 15,600 <1.0 <1.0
2ndQtr 6/5/2019 10.1 13,700 <1.0 <1.0
3rd Qtr 9/4/2019 8.39 10,500 <1.0 <1.0
4th Qtr 12/10/2019 5.92 8,790 2.67 <1.0
1stQtr 2/19/2020 8.6 14,300 10.7 <1.0
2ndQtr 5/27/2020 6.74 5,800 1.3
Well TW4-20 Abandoned in October 2020
(1) voes were resampled because laboratory missed holdmg time.
(2) As of March 2012 both north and south wild life ponds no longer receiving water.
(3) Chloroform pum~n.2, well staned 8/4/05
NA = not analyzed
Bold and italics indicates the MDL exceeded the GWQS
Shaded indicates concentrations exceeding GWQS.
2.2
1.1
1.8
1.9
1.5
1.2
3.7
5.2
4.2
4.4
3.0
3.2
3.7
2.2
5.5
19.0
2.1
3.1
2.5
1.3
1.21
1.3
2.14
1.37
2.04
3.98
2.2
2.38
1.38
1.73
1
1.16
2.36
7.77
12.3
Chloride
No GWQS Cma/Ll
NA NA _________
131
120
235
134
124
124
112
117
170
132
191
156
168
164
164
153
187
179
200
196
203 220
177
207
186
207
--------262
289
302 252
250
260
272
254
269
299
292
290
296
365
293
29":i
318
307
301
290
281
292
293
289
258
282
295
272
279
286
307
310
3.01 ·
Nitrate, Nitrate + Nitrite
110 ma/Ll
10.10
2.90
1.80
3.80
9.40
2.90
3.50
4.20
2.30
2.10
5.60
0.90
8.00
4.44
5.51
5.10
2.90
3.30
5.30
2.00
5.60
5.30
4.60
4.40
4.80
6.50
4.20
7.90 ------------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
TW4-21
(chloroform pumping well
6/9/15)
Sampling Event
TABLE 1 (22 of 33)
Historic Summary Of Monitoring Well Analytical Results Up To The 2nd Quarter 2022
Chloroform Contamination Investigation
DUSA White Mesa Mill
Parameter
(GWQS)
Carbon Tetrachloride Chloroform Chloromethane Methylene Chloride Chloride
15 ua/Ll 170 ua/Ll 130 ua/Ll (5 ua/Ll No GWQS (ma/Ll
1stQtr 3/16/2005 Monitor well was not installed
2nd Qtr , 5/25/2005 NA 192 NA
3rdQtr 8/31/2005 <5.0 78 <5.0
4thQtr 1217/2005 <1 .0 86 <1.0
1stQtr 3/9/2006 <2.5 120 <2.5
2ndQtr 6/14/2006 <2.5 120 <2.5
3rd Qtr 7/20/2006 <2.5 108 <2.5
4th Qtr 11/8/2006 2 139 <1.0
1stQtr 2/28/2007 1.8 160 <1.0
2nd Qtr 6/27/2007 5.8 300 <1.0
3rdQtr 8/15/2007 <1.0 140 <1.0
4th0tr 10/10/2007 <1 .0 120 <1.0
1stQtr 3/28/2008 7 390 <1.0
2nd Qtr 6/25/2008 1.7 180 <1.0
3rd Qtr 9/10/2008 1.6 120 <1.0
4th Qtr 10/15/2008 NA #N/A NA
11/18/2008 2 170 <2.0
1stQtr 3/11/2009 <1.0 180 <1.0
2nd Qtr 6/23/2009 <1 .0 200 <1.0
3rd0tr 9/14/2009 <1.0 200 <1.0
4th Qtr 12/22/2009 <1.0 160 <1.0
1stQtr 2125/20i'i'i <1.0 ffo <1.0
2nd Qtr 6/14/2010 <1.0 210 <1.0
3rd Qtr 8/13/2010 9.2 390 <1.0
4th0tr 10/15/2010 1.2 200 <1.0
1stQtr 2/22/2011 1.2 230 <1.0
2nd Qtr 6/28/2011 4.8 290 <1.0
3rdQtr 8/17/2011 63 460 <1.0
4th Qtr 11/16/2011
1,ro1rUL 1217/2011 6.7 390 <1.0
1/23/2012 6.4 420 <1.0 L---------2nd Qtr 6/6/2012 5.4 400 <1.0
3rdQtr 9/4/2012 6 410 <1.0
4th Qtr 10/3/2012 7 390 <1.0
1st0tr 2/11/2013 5.25 282 <1.0
2nd Qtr 6/5/2013 3.49 328 <1.0
3rdQtr 9/3/2013 2.13 244 <1.0
4th Qtr 10/29/2013 <1.0 204 <1.0
1stQtr 1/27/2014 6.23 220 <1.0
2nd Qtr 5/19/2014 4.73 240 <1.0
3rd Qtr 8/11/2014 <1.0 204 <1.0
4thQtr 10/21/2014 1.04 229 <1.0
1stQtr 3i9/2015 1.75 292 <1.0
2nd Qtr (3l __ 6/8/2015 1.92 366 <1.0 -----281 --------3rd0tr 8/31/2015 <1 .0 <1.0
4th_Qtr 10/19/2015 <1 .0 339 <1.0
1stQtr 3/9/2016 <1 .0 390 ;;·1.0
2ndQtr 5/23/2016 <1.0 545 <1.0
3rd Qtr 7/25/2016 <1.0 456 <1.0
4th Qtr 10/12/2016 <1.0 456 <1.0
1stQtr 3/8/2017 2.36 598 <1.0
2ndQtr 6/13/2017 1.16 224 <1.0
3rd Qtr 7/26/2017 1.05 537 <1.0
4th Qtr 10/11/2017 <1.0 466 <1.0
DWMRC s lit samole <3.8 400 <6.0
1stQtr 3/12/2018 2.36 421 <1.0
2nd Qtr 6/8/2018 <1.0 532 <1.0
3rdQtr 8/22/2018 <1.0 476 <1.0
4th0tr 10/22/2018 <1.0 585 <1.0
1stQtr 3/8/2019 <1.0 323 <1.0
2nd Qtr 6/5/2019 <1.0 734 <1.0
3rd Qtr 9/4/2019 <1.0 596 <1.0
4th Qtr 12/10/2019 <1.0 794 <1.0
1stQtr 2/19/2020 <1.0 844 2.58
2nd0tr 5/27/2020 <1.0 767 <1.0
3rdQtr 9/4/2020 <1.0 920 <1.0
4th Qtr 10/28/2020 <1.0 948 <1.0
1st0tr 2/23/2021 <1.0 400 <1.0
2nd Qtr 6/9/2021 <1.0 1,130 <1.0
3rd Qtr 8/24/2021 <1.0 669 <1.0
4th Qtr 12/1/2021 <1.0 649 <1.0
1stQtr 3/9/2022 <1.0 469 <1.0
2ndQtr 6/8/2022 <1.0 657 <1.0
(1) voes were resampled because laboratory missed holding time.
(2) As of March 2012 both north and south wild life ponds no longer receiving water.
J.3l~l~'!!_op, pumping well started 6/9/15
NA = not analyzed
Shaded indicates concentrations exceeding GWQS.
J = Approximated value
NA
<5.0
<1.0
<2.5
<2.5
<2.5
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
NA
<2.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0 --<1.0
<1.0
<1.0
<1.0
<1.0 -<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
2.04
2.04
<1.0
<1.0
<1.0
<1.0 ---<1.0
<1.0
<1.0
<1.0
<1.0
<1 .0
<1.0
<1.0
<1.0
<1.0
14 J
<1 .0
<1.0
<1.0
<1.0
<1.0
<1.0
<1 .. 0
<1 .0
<1.0
<1 .0
<1.0
<1 .0
<1.0
<1.0
<1 .0
<1.0
<1.0
<1 .0
NA
NA
353
347
318
357
296
306
327
300
288
331
271
244
284
NA
279
291
281
256
228
266
278
210
303
290
287
287
228 --------285
142
270
221
243
207
206
200
243
230
252
255
494 --------499
413
452
425
457
439
452
309
447
378
310
447
387
182
392
180
456
478
339
446
353
382
411
454
461
375
227
110
331
Nitrate, Nitrate + Nitrite
110 ma/Ll
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
15.20
21.5
12.9
17.2
2.2
8.9
TABLE 1 (23 of 33)
Historic Summary Of Monitoring Well Analytical Results Up To The 2nd Quarter 2022
Chloroform Contamination Investigation
DUSA White Mesa Mill
TW4-22 Parameter
(nitrate pumping well started (GWQS)
1126/13)
Sampling Event Carbon Tetrachloride Chloroform Chloromethane Methylene Chloride
15 ua/U 170 ua/U 130 ua/U (5 µg/L)
1stQtr 3/16/2005 Monitor well was not installed
2ndQtr 5/25/2005 NA 340 NA NA
3rd Ott 8/31/2005 <5.0 290 <5.0 <5.0
4thQtr 1217/2005 <5.0 320 <5.0 <5.0
1stQtr 3/9/2006 <10 390 ·;;\o <10
2nd Qtr 6/14/2006 <10 280 <10 <10
3rd Qtr 7/20/2006 <10 864 <10 <10
4th Qtr 11/8/2006 <1.0 350 1.6 <1.0
1stQtr 2128/2007 <1.0 440 <1.0 <1.0
2ndQtr 6/27/2007 <1.0 740 <1.0 <1.0
3rd Qtr 8/15/2007 <1.0 530 <1.0 <1.0
4thQtr 10/10/2007 <1.0 440 <1.0 <1.0
1stQtr 3/28/2008 <1.0 1.400 <1.0 <1.0
2ndQtr 6/25/2008 <1.0 1.200 <1.0 <1.0
3rdQtr 9/10/2008 1.3 6.300 <1.0 <1.0
4thQtr 10/15/2008 NA #N/A NA NA
11/18/2008 <2.0 630 <2.0 <2.0
1stQtr 3/11/2009 <1.0 390 <1.0 <1.0
2nd Qtr 6/23/2009 <1.0 730 <1.0 <1.0
3rdQtr 9/14/2009 <1.0 2.300 <1.0 <1.0
4thQtr 12/29/2009 <1.0 380 <1.0 <1.0
1stQtr 3/23/2010 <1.0 2,266 <1.0 <1.0
2nd Qtr 6/14/2010 <1.0 540 <1.0 <1.0
3rdQtr 8/24/2010 <1.0 340 <1.0 <1.0
4thQtr 10/15/2010 <1.0 340 <1.0 <1.0
1stQtr 2/22/2011 1.2 1.300 <1.0 <1.0
2nd Qtr 6/1/2011 <1.0 210 <1.0 <1.0
3rdQtr 8/17/2011 <1.0 450 <1.0 <1.0
4thQtr 11/16/2011 NA #N/A NA NA
rs1··cH,·/d/·-······· 1f&Jg;; <1.0 400 <1.0 <1.0
<1.0 200 <1.0 <1.0
2nd Qtr 6/13/2012 <1.0 --------,20 ~1.0 <1.0 -----
3rd0tr 9/12/2012 <1.0 121 <1.0 <1,0
4thQtr 10/4/2012 <1.0 ____ 13.2 <1.0 <1.0 L...--------<1.0 ------1st Otr (3) 2/11/2013 3.24 10,600 <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
4thQtr 10/29/2013 8.09 13 300 <1.0 <1.0
1stQtr 1/27/2014 6.06 12,100 <1.0 2.83
2nd Qtr 5/19/2014 6.65 12,400 <1.0 <1.0
3rdQtr 8/11/2014 1.9 12.400 40 <1.0
4thQtr 10/29/2014 3.32 1~,109 1.61 <1.0
1st0tr 3/9/2015 3.77 12,700 4.31 <1.0
2ndQtr 6/8/2015 2.42 8,050 3.42 <1.0
3rd Qtr 8/31/2015 <1.0 7,810 5.47 <1.0
4th Qtr 10/19/2015 3.32 7 530 S.J <1.0
1stQtr :iiai:1016 <1.0 6,070 <1.0 <1.0
2ndQtr 5/23/2016 2.64 8,570 <1,0 <1.0
3rd Qtr 7/25/2016 <1.0 5,840 <1.0 <1.0
4thQtr 10/12/2016 1.08 3,370 <1.0 <1.0
1stQtr 3/8/2017 1.56 s·.320 <1.0 <1.0
2ndQtr 6/13/2017 1.21 3,670 <1.0 <1.0
3rdQtr 7/26/2017 <1.0 5,150 <1.0 <1.0
4th Qtr 10/11/2017 <1.0 4,770 <1.0 <1.0
OWMRC spht sample <38 4 100 <60 150 J
1stQtr 3/1212018 <1.0 4,530 <1.0 <1.0
2ndQtr 6/8/2018 <1.0 3,010 <1.0 <1.0
3rd Qtr 8/22/2018 <1.0 3,600 <1.0 <1.0
4th Qtr 11/28/2018 <1.0 2 680 <1.0 <1.0
1stQtr 3/8/2019 1.02 4,310 -~·,.o <1.0
2nd Qtr 6/5/2019 1.13 4,690 <1.0 <1.0
3rd Qtr 9/4/2019 <1.0 3.460 <1.0 <1.0
4thQtr 12/10/2019 <1.0 3 820 <1.0 <1.0
1stQtr 2/19/2020 1.02 3,910 <1.0 <1.0
2nd Qtr 5/27/2020 <1.0 2,530 <1.0 <1.0
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
1stQtr 21231262·,· <1.0 5,100 <1.0 <1.0
2nd Qtr 6/9/2021 <1.0 4,520 <1.0 <1.0
3rdQtr 8/24/2021 <1.0 3,510 <1.0 <1.0
4th Qtr 1211/2021 <1.0 3 330 <1.0 <1.0
i,tair 3/9/2022 <1.0 3,320 <1.0 <1.0
2nd Qtr 6/8/2022 <1.0 2 600 4.4 <1.0
( 1) voes were resampled because laboratory missed holding time
(2) As of March 2012 both north and south wild life ponds no longer receiving water.
JJ) Chloroform _£Umf!,n.s, wen started 1126/13 _______ ,
NA = not analyzed
Shaded indicates concentrations exceeding GWQS.
Bold and italics indicates the MDL exceeded the GWQS.
J = Approximated value
Chloride
No GWQS lma/U
NA
NA
253
236
221
221
236
347
273
259
238
519
271
524
539
NA
177
177
391
175
427
134
130
134
114
138
120
174
NA
36 -------35
130 --------130
586
487
501 598
614
540
596
675
390
557
567 ------583
598
619
588
566
572
391
600
610
607
580
613
567
528
662
588
608
606
578
514
523
618
408
410
586
442
564
Nitrate, Nitrate + Nitrite
I10ma/U
18.2
15.7
15.1
15.3
14.3
14.5
15.9
20.9
19.3
19.3
18.8
39.1
41.9
38.7
36.3 #N/A
20.7
20 6
40.3
17.8
36 8
19.0
15.0
16.0
18.0
17.0
15.0
19.0
#N/A
14.0
-------128
7.0
14 0 ----------58 0
50 2
29 7
45.2
54.6
47 2
41.5
54.9
69.2
47 1
64.7
56.1
31.1
58.4
61.3
61.5
69.8
70.8
66.1
80 1
79.0
62.3
72.5
55.4
75.7
71.9
83.9
72.5
59.9
57.7
60.5
64.8
64 9
69.6
89.3
35.1
68.8
40.4
45.0
TABLE 1 (24 of 33)
Historic Summary Of Monrtoring Well Analytical Results Up To The 2nd Quarter 2022
Chlorofonn Contamination Investigation
DUSA White Mesa Mill
TW4-23
Sampling Event
Carbon Tetrachloride Chloroform Chloromethane
15 ua/Ll 170 ua/Ll 130 ua/Ll
2nd Qtr 6/27/2007 <1 .0 <1.0 <1.0
3rdQtr 8/15/2007 <1 .0 <1.0 <1.0
4th Qtr 10/10/2007 <1.0 <1.0 <1 .0
1stQtr 3/28/2008 <1 .0 <1.0 <1.0
2nd Qtr 6/25/2008 <1,0 <1,0 <1.0
3rdQtr 9/10/2008 <1 .0 <1.0 <1.0
4thQtr 10/15/2008 NA NA NA
11/18/2008 <2,0 _<2.0 <2.0
1st0tr 3/4/2009 <i'.O <1.0 <1.0
2nd Qtr 6/23/2009 <1 .0 <1.0 <1 .0
3rdQtr 9/14/2009 <1.0 <1.0 <1.0
4thQtr 12/16/2009 <1 ,0 <1,0 <1 .0
'isi"atr 3/24/2010 <1.0 <1.0 <1.0
2ndQtr 6/14/2010 <1 .0 <1.0 <1.0
3rd Qtr 8/24/2010 <1.0 <1.0 <1.0 -
4th Qtr 10/15/2010 <1.0 <1,0 <1.0
1stQtr 2/16/2011 <1.0 <1.0 <1.0
2ndQtr 6/14/2011 <1 .0 <1.0 <1,0
3rdQtr 8/16/2011 <1 .0 <1.0 <1 .0
4thQtr 11/15/2011 <1 .0 <1.0 <1.0
·1st Otr'(1)'""'"···--1,17/2012 <1 .0 <1.0 <1,0 ---------------2nd Qtr 5/3112012 <1 .0 <1.0 <1 .0
3rdQtr 8/29/2012 <1 .0 <1.0 <1.0
4thQtr 10/3/2012 <1 .0 <1.0 <1,0
1s1Qtr 2nt2013 <1 ,0 <1.0 <1.0
2nd Qtr 5/30/2013 <1.0 <1,0 <1.0
3rdQtr 9/5/2013 <1 .0 <1.0 <1.0
4thQtr 11nt2013 <1 .0 <1.0 <1.0
1stQtr 1/23/2014 <1 .0 <1,0 <1.0
2nd Qtr 5/19/2014 <1.0 <1.0 <1 ,0
3rdQtr 8/13/2014 <1,0 <1.0 <1.0
4th0tr 10/28/2014 <1 .0 <1,0 <1.0
1stQtr 3/12/2015 <1 .0 <1.0 <1.0
2nd Qtr 6/6/2015 <1 .0 <1.0 <1.0
3rdQtr 9/3/2015 <1.0 <1.0 <1.0
4th0tr 10/28/2015 <1.0 <1.0 <1.0
Duolicate TW4-70 <1 .0 <1.0 <1,0
r•tOtr 3/16/2016 <1 .0 <1.0 <1.0
2ndQtr 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 3/15/2017 <1.0 <1.0 <1.0
Duplicate TW4-70 <1,0 <1,0 <1.0
12nd Qtr 6/15/2017 <1 .0 <1.0 <1.0
3rd Qtr 8/2/2017 <1,0 <1,0 <1.0
4th Qtr 10/10/2017 <1.0 <1.0 <2.0 ,~:i~~ soht sampl;/14/2018 <1.0 <1.0 <2.0
<1,0 <1.0 <1.0
2nd Qtr 6/13/2018 <1.0 <1.0 <1.0
Duplicate TW4-70 <1.0 <1.0 <1.0
3rd Qtr 8/30/2018 <1.0 <1.0 <1.0
4th0tr 12/12/2018 <1.0 <1.0 <1.0
isiair 3/16/2019 ·•-1.0 <1.0 <1.0
2ndQtr 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
'isi'at, 3/17/2020 <1.0 <1.0 <1.0
2ndQtr 6/11/2020 <1.0 <1.0 <1.0
3rdQtr 9/17/2020 <1.0 <1.0 <1.0
4th Qtr 11/4/2020 <1.0 <1,0 <1.0
1stQtr 3/17/2021 <1.0 ::i',o <1.0
2ndQtr 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
Dup_hcate TW4-70 <1.0 <1.0 <1.0
1stQtr 3/2212022 <1.0 <1.0 <1.0
Duplicate TW4-70 <1.0 <1.0 <1.0
2ndQtr 6/16/2022 <1.0 <1,0 <1.0
(1) As of March 2012 both north and south wild hfe ponds no longer receiving water.
NA = not analyzed
Shaded indicates concentrations exceeding GWQS.
J = Approximated value.
Parameter
IGWQS)
Methylene Chloride
(5ua/Ll
<1.0
<1.0
<1.0
<1,0
<1.0
<1.0
NA
<2.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1,0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<2.0
<2.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1 .0
<1 .0
<1 .0
Chloride Nitrate, Nitrate + Nitrite
No GWQS (ma/Ll 110ma/Ll
47 <0.1
46 <0.1
43 <0.1
41 <0.1
41 <0.1
35 <0.05
51 <0.05
NA NA
41 <0.1
43 <0.1
43 <0,1
37 <0.1
45 °<0,1
40 <0.1
40 <0.1
34 <0,1
44 <0.1
44 <0.1
41 <0,1
43 <0.1
40 <0.1 ---------44 <0.1 --------
46 <0.1
45 <0,1
43.6 -~·0.1
44.7 0.1
48 <0.1
43 <0.1
44.6 <0.1
42.3 <0.1
46 <0.1
46.8 <0.1
47.3 ·<o.,
48.4 <0.1
54.1 <0.1
46.4 <0.1
46.4 <0.1
49.1 <0.1
50.4 <0.1
49.6 <0.1
48.3 <0.1
52.1 <0.1
47.7 <0.1
49.8 <0.1
51.5 <0.1
51.8 <0.1
44.7 <0.1
52 <0.1
53.8 0<0.1
47.6 <0.1
47,9 <0.1
56 <0.1
54.9 <0.1
48.9 <0.1
· 50.2 <0.1
47.9 <0.1
54.4 <0.1
50.0 <0.1
49.0 <0.1
48.8 <0.1
49.3 <0.1
51.6 <0.1
48.8 <0.1
42.8 <0.1
51.2 <0.1
53.2 <0.1
43.8 <0.1
39.2 <0.1
42.2 0.10
TABLE 1 (25 of 33)
Historic Summary Of Monitoring Well Analytical Results Up To The 2nd Quarter 2022
Chlorofonn Contamination Investigation
DUSA White Mesa Mill
TW4-24
(nitrate pumping well started
1/26/13)
Sampling Event Carbon Tetrachloride Chloroform Chloromethane
15 ua/Ll 170 ua/Ll 130 ua/Ll
2ndQtr 6/27/2007 <1.0 2.6 <1.0
3rd Qtr 8/15/2007 <1.0 2.2 <1.0
4th Qtr 10/10/2007 <1.0 1.5 <1.0
1stQtr 3/28/2008 <1.0 1.5 <1.0
2ndQtr 6/25/2008 <1.0 1.4 <1.0
3rd Qtr 9/1 0/2008 <1.0 2.9 <1.0
4th Qtr 10/15/2008 NA #N/A NA
1111812008 <2.0 <2.0 <2.0
1stQtr 31412009 <1.0 1.4 <1.0
2nd Qtr 6/2312009 <1.0 1.5 <1.0
3rd Qtr 911412009 <1.0 1.4 <1.0
4thQtr 12/1612009 <1.0 1.2 <1.0
1stQtr 3125/2010 <1.0 1.3 <1.0
2nd Qtr 6114/2010 <1.0 1.7 <1.0
3rdQtr 8124/2010 <1.0 1.8 <1.0
4thQtr 10/1512010 <1.0 1.4 <1.0
1stQtr 2/16/2011 <1.0 1.8 <1.0
2nd Qtr 611412011 <1.0 1.1 <1.0
3rdQtr 8/16/2011 <1.0 1.7 <1.0
4thQtr 11/15/2011 NA #NIA NA
TstctrH( __ 12/7/2011 <1.0 1.2 <1.0
1/16/2012 <1.0 <1.0 <1.0
2nd Qtr 6/6/2012 <1.0 --<i':o ____ <1.o
3rdQtr 8/30/2012 <1.0 <1.0 <1.0
4thQtr 1013/2012 <1.0 _____ .1 <1.0 --------1stQtr(3) 2/11/2013 <1.0 1 <1.0
2nd Qtr 615/2013 <1.0 17.4 <1.0
3rd Qtr 8130/2013 <1.0 21 .8 <1.0
4thQtr 10/29/2013 <1.0 32.5 <1.0
1stQtr 1127/2014 1.18 78.5 <1.0
2nd Qtr 5/19/2014 <1.0 62.7 <1.0
3rdQtr 8/11/2014 <1.0 76.3 <1.0
4thQtr 10/21/2014 <1.0 25.8 <1.0
1stQtr 3/912015 <1.0 49.2 <1.0
2nd Qtr 6/8/2015 <1.0 4.28 <1.0
3rdQtr 8/3112015 <1.0 46.9 <1.0
4thQtr 1011912015 <1.0 ---------25.3 <1.0
1stQtr 3/9i20i6 0<1.0 22.8 <1.0
2nd Qtr 5/2312016 <1.0 69.6 <1.0
3rdQtr 7/25/2016 <1.0 17.8 <1.0
4thQtr 10/12/2016 <1.0 20.8 <1.0
1stQtr 3/812017 <1.0 18.'3 <1.0
2ndQtr 6/13/2017 <1.0 17.2 <1.0
3rd Qtr 7/26/2017 <1.0 17.8 <1.0
4th Qtr 10/1112017 <1.0 16.0 <1.0
_DWMRC s lit samnle <0.38 36.0 <0.60
1stQtr 3/16/2018 <1.0 24.9 <1.0
2ndQtr 6/14/2018 <1.0 49.2 <1.0
3rd Qtr 8/22/2018 <1.0 35 <1.0
4th Qtr 11/28/2018 <1.0 21 <1.0
DWMRC s lit samole <5.0 60 <5.0
1stQtr 3/8/2019 <1.0 28.1 <1.0
2ndQtr 6/5/2019 <1.0 28.8 <1.0
3rd Qtr 9/412019 <1.0 31 .1 <1.0
4th Qtr 12/10/2019 <1.0 43.3 <1.0
1stQtr 2/19/2020 <1.0 61 .7 <1.0
2ndQtr 5/27/2020 <1.0 49.4 <1.0
3rd Qtr 9/4/2020 <1.0 63.8 <1.0
4th Qtr 10/28/2020 <1.0 72.6 <1.0
1stQtr 2/23/2021 <1.0 96.2 3.6
2ndQtr 61912021 <1.0 41.9 <1.0
3rd Qtr 8/26/2021 <1.0 103 <1.0
4th Qtr 12/112021 <1.0 112 <1.0
1stQtr 3/9/2022 <1.0 114 <1.0
2ndQtr 6/8/2022 <1.0 124 <1.0
( 1) voes were resampled because laboratory missed holding time
(2) As of March 2012 both north and south wild life ponds no longer receiving water.
(=!1_ Chloroform ..eumpm..a, well started 1!26/13 _______ .
NA= not analyzed
Shaded indicates concentrations exceeding GWQS.
J = Approximated value
Parameter
(GWQS)
Methylene Chloride
15 ua/Ll
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
NA
<2.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
NA
<1.0 ;;·fo -<1.0
<1.0
<1.0 ------<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.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
Chloride
No GWQS (ma/Ll
770
791
692
740
834
1,180
1,130
#NIA
1,010
759
618
1 080
896
639
587
522
1,100
1,110
967
608
#N/A
373 ------355
489
405
1,260
916
998
1 030
809
1,020
1,150
1 050
944
1,290
788
909 ·--siis
771
1,180
1 010
1,090
1,080
1,230
895
1100
1,320
792
996
1,100
1,000
1,040
1,020
1,130
1,090
1,010
1,060
1,100
1 050
1,170
938
1,010
1140
980
944
Nrtrate, Nitrate + Nitrite
110 ma/U
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
316
35.0
31.5
35.7
34.6
31 8
25.3
29.6 ----·--------------29.1
24.2
34.4
31.9
41.3
39.9
40.0
31.7
32.0
44.9
33.6
33.8
38.4
34.0
39.3
33.2
36.4
33.8
37.1
41.7
39.1
35.9
41.9
48.0
26.7
43.6
36.2
35.0
~
TABLE 1 (26 of 33)
Historic Summary Of Monitoring Well Analytical Results Up To The 2nd Quarter 2022
Chloroform Contamination Investigation
OUSA White Mesa Mill
TW4-25 Parameter
(nitrate pumping well started (GWQS)
1/26/13)
Sampling Event Carbon Tetrachloride Chloroform Chloromethane Methylene Chloride Chloride
15 ua/LI 170 ua/LI 130 ua/LI (5 ~g/Ll No GWQS (ma/Ll
2nd Qtr 6/27/2007 <1.0 <1.0 <1.0 <1.0 395
3rdQtr 8/15/2007 <1.0 22 <1.0 <1.0 382
4thQtr 10/10/2007 <1.0 <1.0 <1.0 <1.0 358
1s1Qlr 3/28/2008 <1.0 <1.0 <1.0 <1.0 374
2nd Qtr 6/25/2008 <1.0 <1.0 <1.0 <1.0 344
3rdQtr 9/10/2008 <1.0 <1.0 <1.0 <1.0 333
4th Qtr 10/15/2008 NA #N/A NA NA 366
11/18/2008 <2.0 <2.0 <2.0 <2.0 #N/A
1stQtr 3/4/2009 <1.0 <1.0 <1.0 ~io 3
2ndQtr 6/23/2009 <1.0 <1.0 <1.0 <1.0 328
3rd Qtr 9/14/2009 <1.0 <1.0 <1.0 <1.0 328
4th Qtr 12/16/2009 <1.0 <1.0 <1.0 <1.0 371
1stQtr 3/23/2010 <1.0 <1.0 <1.0 <1.0 296
2ndQtr 6/14/2010 <1.0 <1.0 <1.0 <1.0 306
3rd Qtr 8/10/2010 <1.0 <1.0 <1.0 <1.0 250
4th Qtr 10/15/2010 <1.0 <1.0 <1.0 <1.0 312
1stOtr 2/16/2011 <1.0 1.8 <1.0 <1.0 315
2ndQtr 5/25/2011 <1.0 <1.0 <1.0 <1.0 321
3rd Qtr 8/16/2011 <1.0 <1.0 <1.0 <1.0 276
4th Qtr 11/15/2011 <1.0 <1.0 <1.0 <1.0 294
Tsfdfr(2) __ 111512612 <1.0 <1.0 <1.0 <1.0 304 --------------------------------287 2ndOtr 5/31/2012 <1.0 <1.0 <1.0 <1.0
3rd Qtr 9/4/2012 <1.0 <1.0 <1.0· <1.0 334
4th Qtr ____ 10/3/2012 <1.0 ---------<1.0 _<J:O ------<1.0 338 -------<1.0 --------------190 1stQtr (3) 2/11/2013 <1.0 <1.0 <1.0
2ndQtr 6/5/2013 <1.0 <1.0 <1.0 <1.0 136
3rd Qtr 9/4/2013 <1.0 <1.0 <1.0 <1.0 119
4th Qtr 10131/2013 <1.0 <1.0 <1.0 <1.0 88.6
1stQtr 1/27/2014 <1.0 <1.0 <1.0 <1.0 85.7
2ndQtr 5/19/2014 <1.0 <1.0 <1.0 <1.0 51.1
3rd Qtr 8/11/2014 <1.0 <1.0 <1.0 <1.0 67
4thQtr 10/21/2014 <1.0 <1.0 <1.0 <1.0 58.1
1stOtr 3/912015 <1.0 <1.0 <1.0 <1.0 310
2nd Qtr 6/8/2015 <1.0 <1.0 <1.0 <1.0 58.3
3rdQtr 8/31/2015 <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 Qtr 3/9/2016 <1.0 <1.0 <·i.o <-1.0 62.7
2nd Qtr 5/23/2016 <1.0 <1.0 <1.0 <1.0 75.5
3rdQtr 7/25/2016 <1.0 <1.0 <1.0 <1.0 74.1
4thQtr 10/12/2016 <1.0 <1.0 <1.0 <1.0 59.8
1stQtr 3/8/2017 <1.0 1.15 ·;;·1.0 <1.0 285
2nd Qtr 6/13/2017 <1.0 <1.0 <1.0 <1.0 69.8
3rdQtr 7/26/2017 <1.0 <1.0 <1.0 <1.0 70.1
4thQtr 10/11/2017 <1.0 .~to <1.0 <1.0 68.0
1stOtr 3/12/2018 <1.0 1.15 <1.0 <1.0 70.5
2nd Qtr 6/14/2018 <1.0 <1.0 <1.0 <1.0 60.3
3rdQtr 8/22/2018 <1.0 <1.0 <1.0 <1.0 69.1
4thOtr 11/28/2018 <1.0 <1.0 <1.0 <1.0 59.7
1stQtr 3/8/201!i <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 58.1
4thQtr 12/10/2019 <1.0 <1.0 <1.0 <1.0 73.1
1stQtr 2/19/202.ff <1.0 <1.0 <1.0 <1.0 86.0
2nd Qtr 5/27/2020 <1.0 <1.0 <1.0 <1.0 76.8
3rdQtr 9/4/2020 <1.0 <1.0 <1.0 <1.0 67.3
4thQtr 10/28/2020 <1.0 <1.0 <1.0 <1.0 61 .3
1stQtr 2/23/2021 <1.0 <1.0 <1.0 <1.0 100
2nd Qtr 6/9/2021 <1.0 <1.0 <1.0 <1.0 55.1
3rd Qtr 8/26/2021 <1.0 <1.0 1.34 <1.0 69.3
4th Qtr 1211/2021 <1.0 <1.0 <1.0 <1.0 93.7
1stQtr 3/9/2022 <1.0 <1.0 <1.0 <1.0 70.3
2ndQtr 6/8/2022 <1.0 <1.0 <1.0 <1.0 72.8
(1) voes were resampled because laboratory missed holding time.
(2) As of March 2012 both north and south wild Ute ponds no longer receiving water.
(~Chloroform_eume,n.a,well started 1126/13 -------·
NA = not analyzed
Shaded indicates concentrations exceeding GWQS.
Nitrate, Nitrate + Nitrite
110ma/LI
17.1
29
17
18.7
22.1
18.8
21.3
#N/A
15.3
15.3
3.3
14.2
14.4
16
14
15
15
16
16
16
16 --------16
17
17
9.04
5.24
5.69
6.1
2.16
1.21
1.6
1.03
144
1.14
1.63
1.78
0.837
0.959
1.78
1.24
17.0
0.976
1.23
1.29
2.2:i
1.14
0.810
0.634
0.639
0.821
0.548
0.841
0.607
0.851
0.994
1.64
3.43
1.57
0.793
0.978
1.8
0.88
TW4-26
Sampling Event
TABLE 1 (27 of 33)
Historic Summary Of Monitoring Well Analytical Results Up To The 2nd Quarter 2022
Chloroform Contamination Investigation
Parameter
IGWQSl
Carbon Tetrachloride
15 uo/Ll
DUSA White Mesa Mill
Chloroform Chloromethane Methylene Chloride Chloride
170 ua/Ll 130 ua/Ll 15 ua/Ll No GWQS lma/Ll
2nd Qtr 6/14/2010 <1.0 13 <1.0 <1.0 33
3rd Qtr 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
3rd Qtr 8/17/2011 <1.0 2.8 <1.0 <1.0 19
4th Qtr 11/16/2011 NA #N/A NA NA 26
Nitrate, Nitrate + Nitrite
110 ma/Ll
7.9
9.0
9.6
100
10.0
11.0
100
TsfCii,HJ ;11~;~g;~ :; g 5 ~ ;tL _____ :; g #NtA 11 #NtA 11.0
2nd Qtr -6/6/2012 <1.0 ---4.1 <1.0 <1.0 -----------19 -------120
3rd Qtr 9/11/2012 <1.0 4.9 <1.0 <1.0 19 9.0
4th Qtr 10/3/2012 <1.0 4.9 <1.0 <1.0 19 12.0
1st.Qtr 211112013 <1.0 4.9 <1.0 <1.0 16.6 12.5
2nd Qtr 6/13/2013 <1.0 2.12 <1.0 <1.0 14.5 13.6
3rd Qtr 9/5/2013 <1.0 2.81 <1.0 <1.0 17.6 11.7
4th Qtr 1117/2013 <1.0 3.37 <1.0 <1.0 15.91----------'1""5."'-'9
1st Qtr 1/29/2014 <1.0 1.43 <1.0 <1.0 1e:-ii 14.2
2nd Qtr 5/21/2014 <1.0 4.23 <1.0 <1.0 15.4 12.5
3rd Qtr 8/11/2014 <1.0 1.3 <1.0 <1.0 15 10.8
"i~~~g~~~r __ __,1=~;~~=~;~~~g~;:'-'-:-'-;~·g---------l---~~;~1--:-'-;'c.g'-----+-:;~."-g---------l-------";:~.~"l---------'-;!""•-"I~
2ndQtr 6/10/2015 <1.0 6.12 1.17 <1.0 14.4 113
3rd Qtr 9/3/2015 <1.0 14 14.2 4.77 <1.0 <1.0
4th Qtr 10/28/2015 <1.0 13.3 13.9 -------~=-------~= 3.45 <1.0 <1.0
1st Qtr 3/16/2016 <1.0 13.7 16.9 1.8 <1.0 <1.0
2nd Qtr 5/26/2016 <1.0 15.2 13.9 8.23 <1.0 <1.0
3rd Qtr 8/3/2016 <1.0 13.9 17.9 4.42 <1.0 <1.0
4th Qtr 1012012016 <1.0 14.21----------'1"'-5"'1.o 1st Qtr 3/16/2017 <1.0 16.2. 15.8
19.9 <1.0 <1.0
46.1 <1.0 <1.0
2nd Qtr 6/20/2017 <1.0 19 15.2 244 <1.0 <1.0
3rd Qtr 8/3/2017 <1.0 25.8 15.2 419 <1.0 <1.0 ;:~ g: 1~;~;;~~-1~1-:'-';""g"-------+----"""l-'-"''---------l...:..C"'---------l---------"~~'-'.-"l; -----;~.~ 608 <1.·o <1.0
1,050 <1.0 <1.0
2nd Qtr 6/14/2018 <1.0 33.5 13.2 960 <1.0 <1.0
3rd Otr 9/6/2018 <1.0 38.9 13.5 916 <1.0 <1.0
4th Qtr 12/13/2018 <1.0 33.4 11.8 1 050 <1.0 <1.0
1st Qtr 3/20/2019 <1.0 32.9 12.2 963 <1.0 <1.0
2nd Qtr 6/5/2019 <1.0 35.8 12.6 1,070 <1.0 <1.0
3rd Qtr 9/12/2019 <1.0 32.0 10.9 877 <1.0 <1.0
4th Qtr 12/18/2019 <1.0 38.3 10.3 ·1·statr 3/18/2020 <1.0 36.3 ...... ,_ 11.9
1 070 <1.0 <1.0
1,090 <1.0 <1.0
2nd Otr 6/12/2020 <1.0 35.1 11.1 1,140 <1.0 <1.0
3rd Qtr 9/19/2020 <1.0 34.8 10.5 1120 <1.0 <1.0
4thQtr 11/11/2020 <1.0 36.3 11.9 1,160 <1.0 <1.0
1stQtr 3/24/2021 <1.0 38.9 11.3 1,030 <1.0 <1.0
2nd Qtr 6/17/2021 <1.0 34 14.2 1,020 <1.0 <1.0
3rdQtr 9/23/2021 <1.0 36.5 12.1 927 <1.0 <1.0
4th Qtr 12/9/2021 <1.0 34.9 8.15 993 <1.0 <1.0
952 2.4 <1.0 1st Qtr 3/24/2022 <1.0 33.0 10.9
790 <1.0 <1.0 2nd Qtr 6/22/2022 <1.0 34 9.9
TW4-27
1st Citr (2) 1/18/2012 <1.0
2nd Qtr -6/13/2012 <1.0 --
9 <1.0 <1.0 11 24.0 ------------------<1.0 <1.0 <1.0 17 41.0
3rd Qtr 9/4/2012 <1.0 <1.0 <1.0 <1.0 21 37.0
4th Qtr 10/3/2012 <1.0 <1.0 <1.0 <1.0 18 36.0
1st Qtr 217/2013 <1.0 <1.0 <1.0 <1.0 18.8 31.2
2nd Otr 6/13/2013 <1.0 <1.0 <1.0 <1.0 20.3 29.4
3rd Qtr 8/30/2013 <1.0 <1.0 <1.0 <1.0 19 27.2
4th Qtr 11/6/2013 <1.0 <1.0 <1.0 <1.0 21.8 29.8
1st Qtr 1/23/2014 <1.0 <1.0 <1.0 <1.0 31.8 31.3
2nd Qtr 5/21/2014 <1.0 <1.0 <1.0 <1.0 20.6 31.1
3rd Qtr 8/13/2014 <1.0 <1.0 <1.0 <1.0 23 27.0
4th Qtr 10/2812014 <1.0 <1.0 <1.0 <1.0 24.4 28.2
1st Qtr 3/11/2015 <1.0 <1.0 <1.0 <1.0 26.2 26.5
2nd Qtr 6/10/2015 <1.0 <1.0 <1.0 <1.0 26.8 24.0
3rd Otr 9/2/2015 <1.0 1.3 <1.0 <1.0 26.8 20.9
1.6 <1.0 <1.0 26.2 23.5
2.11 <1.0 <1.0 28 25.0 ;: g:; 1~;~i,~;~"'g'-';"'-~!-:'-';"'g"-------+----'-'"'l-'-"''------4-'-'-'"'---------1---------"""'-l--
2nd Qtr 5/26/2016 <1,0 3.16 <1.0 <1.0 21.2 28.7
3rd Qtr 8/3/2016 <1.0 2.78 <1.0 <1.0 27.1 21.8
4th Qtr 10/20/2016 <1.0 3.8 <1.0 <1.0 29.4 19.3
1st Qtr 3/15/2017 <1.0 4.33 <1.0 <1.0 28.3 22 2
2nd Qtr 6/15/2017 <1.0 5.65 <1.0 <1.0 27.9 23.8
3rd Qtr 8/2/2017 <1.0 6.05 <1.0 <1.0 29.5 20.0
4th Qtr 10/10/2017 <1.0 5.91 <1.0 <1.0 26.3 21.5
1st Qtr 3/14/2018 <1.0 6.95 <1.0 <1.0 30.3 19.5
2nd Qtr 6/13/2018 <1.0 5.95 <1.0 <1.0 28.3 22.0
3rd Qtr 8/30/2018 <1.0 7.35 <1.0 <1.0 31.4 18.1
4th Qtr 12/12/2018 <1.0 7.7 <1.0 <1.0 28.2 20.8
1st Qtr 3/16/2019 <1.0 6.54 <1.0 <1.0 26.2 21.5
2nd Qtr 6/13/2019 <1.0 8.24 <1.0 <1.0 28.6 22.3
3rd Qtr 9/11/2019 <1.0 7.58 <1.0 <1.0 25.3 21.2
4th Qtr 12/14/2019 <1.0 7.97 <1.0 <1.0 27.4 22.0
1st Qtr 3/18/2020 <1.0 8.04 <1.0 <1.0 27.6 23.6
2nd Qtr 6/11/2020 <1.0 7.92 <1.0 <1.0 28.0 21.5
3rd Qtr 9/18/2020 <1.0 5.62 <1.0 <1.0 26.2 25.2
4th Qtr 11/4/2020 <1.0 7.8 <1.0 <1.0 26.8 16.7
'istQtr 3/18/2021 <1.0 4.66 <1.0 <1.0 27.5 23.0
2nd Otr 6/17/2021 <1.0 4.26 <1.0 <1.0 25.8 23.8
3rd Qtr 9/15/2021 <1.0 3.81 <1.0 <1.0 21,7 21.1
4th Qtr 12/8/2021 <1.0 4.08 <1.0 <1.0 26.4 24.9
1st Qtr 3/23/2022 <1.0 3.3 <1.0 <1.0 22.7 21.3
2nd Qtr 6/16/2022 < 1. 0 3.1 <1.0 <1.0 22.3 20.0
(1) voes were resampled because laboratory missed holding time.
(2) As of March 2012 both north and south wild life ponds no longer receiving water. _____ _
NA= not analyzed
Shaded 1nd1cates concentratIons exceedmg GWQS
TW4-28
Sampling Event
TABLE 1 (28 of 33)
Historic Summary Of Monitoring Well Analytical Results Up To The 2nd Quarter 2022
Chloroform Contamination Investigation
DUSA White Mesa Mill
Parameter
IGWQS\
Carbon Tetrachloride Chloroform Chloromethane Methylene Chloride Chloride
15 ua/LI 170 ua/LI 130 ua/LI (5 ug/LJ No GWQS (mg/Ll
2ndQtr 6/19/2013 <1.0 <1.0 <1.0
3rd Qtr 8/29/2013 <1 .0 <1.0 <1.0
4th Qtr 11/6/2013 <1.0 <1.0 <1.0
1stQtr 1/22/2014 <1.0 <1.0 <1.0
2ndQtr 5/21/2014 <1.0 <1,0 <1.0
3rd Qtr 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 <1.0
2ndQtr 6/10/2015 <1.0 <1.0 <1.0
3rd Qtr 9/2/2015 <1.0 <1,0 <1.0
4th Qtr 10/21/2015 <1.0 <1.0 '.'_10
1stQtr 3/15/2016 <1.0 <1.0 <1.0
Duphcate lW4-65 <1 .0 <1.0 <1.0
I2ndQtr 5/25/2016 <1.0 <1,0 <1.0
3rd Qtr 7/27/2016 <1.0 <1.0 <1.0
Dupllcate lW4-65 <1.0 <1.0 <1.0
14th Qtr 10/19/2016 <1.0 <1.0 <1.0
I ~~i l~~~e TW4-65 <1.0 <1.0 <1.0
3/14/2017 <1.0 <1.0 <1.0
Duplicate TW4-65 <1.0 <1.0 <1.0
2ndQtr 6/14/2017 <1.0 <1.0 <1.0
3rd Qtr 7/27/2017 <1.0 <1.0 <1.0
4th Qtr 10/10/2017 <1.0 <1.0 <1.0
1stOtr 3/14/2018 <1.0 <1,0 <1.0
2ndQtr 6/12/2018 <1.0 <1.0 <1.0
Duplicate TW4-65 <1.0 <1.0 <1.0
3rd Qtr 8/29/2018 <1.0 <1.0 <1.0
4thQtr 11/30/2018 <1.0 <1.0 <1.0
1stQtr 3/1612Cfr9 <1.0 <1.0 <1.0
2nd Qtr 6/13/2019 <1.0 <1.0 <1.0
3rdQtr 9/11/2019 <1.0 <1.0 <1.0
4th Qtr 12/12/2019 <1.0 <1.0 <1.0
1stQtr 3/17/2020 <1.0 <1.0 <1.0
2nd Qtr 6/10/2020 <1.0 <1.0 <1.0
3rdQtr 9/17/2020 <1,0 <1.0 <1.0
A>h "'' 11/4/2020 <1.0 <1.0 <1.0
lStUtr 3/17/2021 <1.0 <1.0 <1.0
2nd Qtr 6/15/2021 <1.0 <1.0 <1.0
3rdQtr 9/15/2021 <1.0 <1.0 <1.0
4th Qtr 1217/2021 <1.0 <1.0 <1.0
'ist'citr 3/15/20:fa <1.0 <1.0 <1.0
2nd Qtr 6/15/2022 <1.0 <1.0 <1.0
TW4-29
2nd Qtr 6/19/2013 <1.0 242 <1.0
2nd Qtr 7/11/2013 <1.0 262 <1.0
3rdQtr 9/26/2013 <1.0 246 <1.0
4th Qtr 11/13/2013 <1.0 260 <1.0
1stQtr 2/5/2014 <1.0 258 <1.0
2nd Qtr 5/22/2014 <1.0 262 <1.0
3rdQtr 8/27/2014 <1.0 242 <1.0
4thQtr 10/29/2014 <1.0 290 <1.0
1stQtr 3/12/2015 <1.0 299 <1.0
2ndQtr 6/11/2015 <1.0 329 <1.0
3rd Qtr 9/3/2015 <1.0 276 <1.0
4thQtr 10/29/2015 <1.0 ----631 <1.0
1stQtr 3/17/2016 -~·1.0 335 <1.0
2ndQtr 6/8/2016 <1.0 366 <1.0
3rd Qtr 8/3/2016 <1.0 401 <1.0
4th Qtr 10/26/2016 <1.0 392 <1.0
1stQtr 3/16/2017 <1.0 446 <1.0
2ndQtr 6/4/2017 <1.0 420 <1.0
3rd Qtr 8/4/2017 <1.0 466 <1.0
4thQtr 10/11/2017 <1.0 431 <1.0
1stQtr 3/14/2018 <1.0 533 <1.0
2ndQtr 6/14/2018 <1.0 474 <1.0
3rd Qtr 8/29/2018 <1.0 454 <1.0
4th Qtr 12/13/2018 <1.0 521 <1.0
1stQtr 3/20/2019 <1.0 507 <1.0
2nd Qtr 6/13/2019 <1.0 537 <1.0
3rdQtr 9/12/2019 <1.0 549 <1.0
4thQtr 12/18/2019 <1.0 630 <1.0
1stQtr 3/18/2020 <1.0 652 <1.0
2nd Qtr 6/12/2020 <1.0 686 <1.0
3rdQtr 9/19/2020 <1.0 621 <1.0
4thQtr 11/11/2020 <1.0 671 <1.0
OWMRC.spj1t samole <10 670 <20
1st0tr 3/24/2021 <1.0 577 <1.0
2nd Qtr 6/17/2021 <1.0 543 <1.0
3rdQtr 9/23/2021 <1.0 602 <1.0
4th Qtr 12/9/2021 <1.0 625 <1.0
DuP.licate lW4-75 <1.0 636 <1.0
1stQtr 3/23/2022 <1.0 624 <1.0
2ndQtr 6/22/2022 <1.0 398 <1.0
H = Sample was analyzed beyond holding times and may not be accureate concentration
Stiaded 1nd1cates concentrat1ons exceeding GWQS
<1.0 44.6
<1.0 45.3
<1.0 45.3
<1.0 47,8
<1.0 45.7
<1.0 50
<1.0 52.1
<1.0 52.2
<1.0 56.4
<1,0 61.4
<1.0 52.7
<1.0 61,6
<1.0 61.4
<1.0 67,1
<1.0 70,1
<1.0 70.9
<1.0 70.9
<1.0 73.7
<1.0 64.2
<1.0 66.4
<1.0 68.6
<1.0 67.1
<1.0 57.4
<1.0 65.0
<1.0 55,7
<1.0 56.7
<1.0 63.8
<1.0 52.4
<1.0 51:i
<1.0 51.8
<1.0 49.0
<1.0 50.0
<1 .0 52.1
<1.0 49.8
<1.0 47.4
<1.0 49.0
<1.0 518
<1.0 48.5
<1.0 40.7
<1.0 47.8
<1 .0 38.8
<1.0 52.3
<1.0 44.8
<1.0 37.7
<1.0 41.4
<1.0 42.5
<1.0 14.9
<1.0 38.2
<1.0 41
<1.0 41
<1.0 40.5
<1.0 42.5
<1.0 47,3
<1.0 39.8 -----------<1.0 40.5
<1.0 42.9
<1.0 40.6
<1.0 44.2
<1.0 41.5
<1.0 42
<1.0 42.9
<1.0 37.7
<1.0 43.1
<1.0 40.1
<1.0 45.9
<1.0 40.9
<1.0 39.9
<1.0 39.4
<1.0 38
<1,0 44.8
<1.0 41
<1.0 42.2
<1.0 39.9
<1.0 40.8
<20 42
<1.0 44.3
<1.0 40
<1.0 40.1
<1.0 38.7
<1.0 40
<1.0 39.1
<1.0 41.5
Nitrate, Nitrate + Nitrite
110 ma/Ll
14 9
17.3
16.2
169
16 5
14.2
16.5
19.0
190
17.8
18.7
34 0
32 6
290
31 3
35.6
25.5
25.4
244
27 9
26.0
24.8
24.8
17.2
19.0
18.7
16.0
17,7
17.2
15.0
10.2
9.48
9.87
9.55
8.36
7.76
8.68
9.09
8.08
7.60
7.80
15.0
4.60
3.52
4.18
4.11
4.63
3.52
3.40
3.64
4.14
2.95
2.19
2.74
2.92
2.51
2.44
2.40
2.24
2.26
2.35
2.45
2.44
2.67
2.52
2.50
2.67
2.56
2.55
2.58
3,10
3.18
2.90
3.27
0.75 H
3.09
3.59
3.29
2.39
1.91
3.10
2.9
TW4-30
Sampling Event
TABLE 1 (29 of 33)
Historic Summary Of Monitoring Well Analytical Results Up To The 2nd Quarter 2022
Chloroform Contamination Investigation
DUSA White Mesa Mill
Parameter
(GWQSl
Carbon Tetrachloride Chloroform Chloromethane Methylene Chloride Chloride
15 ua/Ll 170 ua/Ll 130 ua/Ll 15 ua/Ll No GWQS lma/Ll
2nd Qtr 6/19/2013 <1.0 <1.0 <1.0 <1 .0 36
3rdQtr 9/26/2013 <1.0 <1.0 <1.0 <1 .0 36.3
4thQtr 11/13/2013 <1.0 <1.0 <1.0 <1 .0 35.9
1stQtr 1/23/2014 <1,0 <1.0 <1.0 <1.0 36.9
2nd Qtr 5/22/2014 <1.0 <1.0 <1.0 <1 .0 31.9
3rd Qtr 8/23/2014 <1.0 <1.0 <1,0 <1.0 38
4thQtr 10/23/2014 <1.0 <1.0 <1.0 <1.0 37.1
1stQtr 3/11/2015 <1.0 1.65 <1.0 <1.0 38.3
2ndQtr 6/11/2015 <1.0 2.25 <1.0 <1.0 40.3
3rd Qtr 9/3/2015 <1.0 3.27 <1.0 <1.0 44.2
4th Qtr 10/28/2015 <1.0 3.48 <1.0 <1.0 37.8
1stQtr 3/17/2016 <1.0 5.16 <1.0 <1.0 39.6
2ndQtr 5/26/2016 <1.0 7.38 <1.0 <1 .0 40.2
3rdQtr 8/3/2016 <1.0 6.79 <1.0 <1.0 38.6
4thQtr 10/20/2016 <1.0 8.69 <1.0 <1.0 41.3
1stOtr 3/15/2017 <1.0 13.6 <1.0 <1.0 37.7
2nd Qtr 6/15/2017 <1.0 15.2 <1.0 <1.0 37.8
3rd Qtr 8/3/2017 <1.0 15.7 <1.0 <1.0 39.8
4thQtr 10/10/2017 <1.0 13.4 <1.0 <1.0 34.9
1stQtr 3/15/2018 <1,0 16.4 <1.0 <1.0 41
2ndQtr 6/13/2018 <1.0 16.9 <1.0 <1.0 37.4
3rd Qtr 8/30/2018 <1.0 19.8 <1.0 <1.0 44.1
4th Qtr 12112/2018 <1,0 23.9 <1.0 <1.0 35.5
1stQtr 3/15/2019 <1.0 25.3 <1.0 <1.0 35.9
2nd Qtr 6/13/2019 <1.0 31.5 <1.0 <1.0 27.2
3rd Qtr 9/11/2019 <1.0 34.8 <1.0 <1.0 34.5
4th Qtr 12/18/2019 <1.0 44.9 <1.0 <1.0 39.1
1stQtr 3/17/2020 <1.0 53.1 <1.0 <1.0 37,5
2ndQtr 6/1212020 <1 .0 65.4 <1.0 <1.0 38.6
3rd Qtr 9/18/2020 <1 .0 67.7 <1.0 <1.0 35
4th Qtr 11/11/2020 <1 .0 82.8 <1.0 <1.0 37.1
DWMRC snlrt sam 1e <10 66 <20 <20 39
1stQtr 3/17/2021 <1.0 74.8 <1.0 <1.0 3i6
2ndQtr 6/17/2021 <1.0 78.7 <1.0 <1.0 38.3
3rdQtr 9/22/2021 <1 .0 78.2 <1.0 <1.0 23.5
4th Qtr 12/8/2021 <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 6/22/2022 <1 ,0 70.8 <1.0 <1.0 41 .3
TW4-31
2nd Qtr 6/19/2013 <1,0 <1.0 <1.0 <1.0 28.4
3rdQtr 9/5/2013 <1.0 <1.0 <1.0 <1.0 29.4
4th Qtr 11n/2013 <1 ,0 <1.0 <1.0 <1.0 28
1stQtr 1/23/2014 <1~0 <1,0 <1.0 <1.0 28.5
2nd Qtr 5/21/2014 <1 .0 <1.0 <1,0 <1.0 26.3
3rdQtr 8/13/2014 <1 .0 <1.0 <1.0 <1.0 30
4thQtr 10/28/2014 <1.0 <1.0 <1.0 <1.0 37.1
1stQtr 3/11/2015 <1.0 <1.0 <1,0 <1.0 30.6
2nd Qtr 6/10/2015 <1.0 <1,0 <1.0 <1.0 31 .1
3rd Qtr 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 ,ti:o <1.0 <1.0 <1.0 31 .5
2nd Qtr 5/25/2016 <1.0 <1.0 <1.0 <1.0 32.5
3rdQtr 7/28/2016 <1.0 <1.0 <1.0 <1.0 30.6
4thOtr 10/20/2016 <1.0 <1.0 <1.0 <1.0 34
1stOtr 3/15/201i <1.0 <1.0 <1.0 <1.0 31 ::i'
2nd Qtr 6/15/2017 <1 ,0 <1.0 <1.0 <1.0 33.4
3rdQtr 8/2/2017 <1 .0 <1.0 <1.0 <1.0 33
4th Qtr 10/10/2017 <1.0 <1.0 <1.0 <1.0 30.9
'i'stOtr 3/14/2018 <1 .. 0 <1.0 <1.0 <1.0 38.8
2ndQtr 6/1212018 <1 .0 <1.0 <1.0 <1.0 34.4
3rdOtr 8/29/2018 <1.0 <1.0 <1.0 <1.0 40.3
4thQtr 12112/2018 <1 .0 <1.0 <1.0 <1.0 35.2
1stQtr 3/16/2019 <1.0 <1.0 <1.0 <1.0 35
2nd Qtr 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
1stQtr 3/17/2020 <1,0 <1,0 <1.0 <1.0 38.2
2ndQtr 6/1212020 <1.0 <1.0 <1.0 <1.0 36.7
3rdQtr 9/17/2020 <1.0 <1.0 <1.0 <1.0 36.5
4thQtr 11/4/2020 <1.0 <1.0 <1.0 <1.0 36.4
1stQtr 3/17/2021 <1.0 <1.0 <1.0 <1.0 40.3
2ndOtr 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 12/8/2021 <1.0 <1.0 <1.0 <1.0 40.3
1stQtr 3/16/2022 <1 .0 <1.0 <1.0 <1.0 34.3
2ndQtr 6/16/2022 <1.0 <1.0 <1.0 <1.0 35.5
Shaded 1nd1cates concentrations exceeding GWOS
H = Sample was analyzed beyond holding times and may not be accureate concentration.
Nitrate, Nitrate + Nitrite
110 ma/Ll
0.95
0.952
1.24
1.36
1.44
1.5
1.84
2.15
1.75
1.75
1.86
2.74
2.04
2.32
2.51
2.70
2.95
3.11
2.58
3.63
3.93
3.79
3.70
4.08
4.13
3.79
0 ~,
3.85
3.69
3.49
3.64
<0.5 H
3.54
4.19
2.60
3.14
3.0
2.8
1.3
1.1
1.33 ,.:fa
1.22
1.1
1.84
1.:i:l
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
TW4-32
Sampling Event
TABLE 1 (30 of 33)
Historic Summary Of Monitoring Well Analytical Results Up To The 2nd Quarter 2022
Chloroform Contamination Investigation
DUSA White Mesa Mill
Parameter
IGWQSl
Carbon Tetracbloride Chloroform Chloromethane Methylene Chloride Chloride
(5 µg/LJ 170 ua/L) (30 ua/Ll 15 un/Ll No GWQS lmn/Ll
4th Qtr 11114/2013 <1.0 <1.0 <1.0 <1.0 52.1
1stQtr 1122/2014 <1.0 <1.0 <1.0 <1.0 54.5
2ndQtr 5121/2014 <1.0 <1.0 <1.0 <1.0 54.9
3rd Qtr 8113/2014 <1.0 <1.0 <1.0 <1.0 64
4th Qtr 10123/2014 <1.0 <1.0 <1.0 <1.0 62.6
1stQtr 311112015 <1.0 <1.0 <1.0 <1.0 64.2
Duplicate TW4-65 <1.0 <1.0 <1.0 <1.0 65.9
2ndQtr 611012015 <1.0 <1.0 <1.0 <1.0 62.7
3rd Qtr 9/212015 <1.0 <1.0 <1.0 <1.0 59.6
4th Qtr 10/2112015 <1.0 <1.0 <1.0 <1 .0 55.1
1stQtr 3/1512016 <1.0 <1.0 <1.0 ~ <1.0 64.2
2ndQtr 5125/2016 <1.0 <1.0 <1.0 <1.0 71.8 --3rd Qtr 7/28/2016 <1.0 <1.0 <1.0 <1.0 64.4
4th Qtr 1011912016 <1.0 <1.0 <1.0 <1.0 66
1st0tr 3/1712017 <1.0 <1.0 <1.0 <1.0 62.8
2ndQtr 611512017 <1.0 <1.0 <1.0 <1.0 53.5
3rd Qtr 8/212017 <1.0 <1.0 <1.0 <1.0 65.8
4th Qtr 1011012017 <1.0 <1.0 <1.0 <1.0 65.8
1stQtr 3114/2018 <1.0 <1.0 <1.0 <1 .0 65'4
2ndQtr 6112/2018 <1.0 <1.0 <1.0 <1.0 59.2
3rdQtr 8/29/2018 <1.0 <1.0 <1.0 <1 .0 68.1
4thQtr 11/30/2018 <1.0 <1.0 <1.0 <1 .0 57.5
1sIQtr 3/1612019 <1.0 <1.0 <1.0 <1.0 57.5
911112019 <1.0 <1.0 <1.0 <1.0 60.1
9111/2019 <1.0 <1.0 <1.0 <1 .0 55.0
12114/2019 <1.0 <1.0 <1.0 <1.0 64.7
Qtr 3117/2020 <1.0 <1.0 <1.0 <1 .0 59.7
2nd Qtr 6110/2020 <1.0 <1.0 <1.0 <1 .0 57.0
3rdQtr 9/17/2020 <1.0 <1.0 <1.0 <1 .0 50.8
4thQtr 1114/2020 <1.0 <1.0 <1.0 <1.0 53.7
'fsfotr 3/1712021 <1.0 <1.0 <1.0 <1.0 60.5
2ndQtr 611512021 <1.0 <1.0 <1.0 <1 .0 40.4 l~g; 911512021 <1.0 <1.0 <1.0 <1 .0 46.1
12m2021 <1.0 <1.0 <1.0 <1 .0 55.0
3/1612022 <1.0 <1.0 <1.0 <1 .0 48.0
2ndQtr 6/1512022 <1.0 <1.0 <1.0 <1.0 49.4
TW4-33
4th Qtr 11/14/2013 <1.0 126 <1.0 <1.0 47.2
1st0tr 1/30/2014 <1.0 124 ~i:o <1.0 43.5
2ndQtr 5/22/2014 <1.0 121 <1.0 <1 .0 46.8
3rd Qtr 8/2712014 <1.0 104 <1.0 <1 .0 43
4th Qtr 10/2912014 <1.0 124 <1.0 <1 .0 44.2
1st0tr 3112/201.5 ·••1:0 134 •·i.o <1.0 44.:i
2ndQtr 6111/2015 <1.0 127 <1.0 <1.0 46.6
3rd Qtr 9/312015 <1 .0 123 <1.0 <1 .0 53.3
4th Qtr 10/2912015 <1 .0 129 <1.0 <1.0 44.5
1stQtr 311712016 <1.0 122 <1.0 <1.0 46.2
2ndQtr 6/8/2016 <1.0 96.1 <1.0 <1.0 49.7
3rd Qtr 8/412016 <1.0 121 <1.0 <1.0 48.5
4th Qtr 10/2612016 <1.0 109 <1.0 <1 .0 52.4
1stQtr 3/1712017 <1.0 90.7 <1.0 <1 .0 4fi:o
2ndQtr 6/2012017 <1.0 103 <1.0 <1.0 49.2
3rd Qtr 8/312017 <1.0 127 <1.0 <1.0 46.9
4th Qtr 10/11/2017 <1 .0 97.1 <1.0 <1.0 42.5
1stQtr 311512018 <1 .0 128 <1.0 <1.0 49.2
2ndQtr 6/1312018 <1 .0 87.8 <1.0 <1.0 44.0
3rd Qtr 915/2018 <1 ,0 113 <1.0 <1.0 50.0
4th Qtr 12/1312018 <1.0 141 <1.0 <1.0 43.2 ····-1stQtr 3/2012019 <1 .0 86.2 <1.0 <1.0 47.2
2ndQtr 611912019 <1 .0 121 <1.0 <1.0 43.4
3rdQtr 9112/2019 <1 .0 101 <1.0 <1.0 41.1
4th Qtr 1211812019 <1.0 117 <1.0 <1.0 48.8
1stQtr 3118/2020 <1 .0 93.7 <1 .0 <1.0 453
2nd Qtr 6/1012020 <1 .0 90.1 <1.0 <1.0 48.9
3rdQtr 9/18/2020 <1 .0 84.9 <1.0 <1.0 51.0
4thQtr 11111/2020 <1.0 80.6 <1 .0 <1.0 51.5
OWMRC sclit samcle <10 68 <20 <20 54
'istQtr 3118/2021 <fo 64.9 <1.0 <1.0 55.6
2nd Qtr 6/17/2021 <1 .0 63.9 <1.0 <1.0 54.7
3rdQtr 9122/2021 <1 .0 60.2 <1.0 <1.0 42.5
4thQtr 12/8/2021 <1 .0 68.9 <1.0 <1.0 53.8
1stQtr 3123/2022 <1.0 53.1 <1.0 <1.0 51.4
2nd Qtr 6122/2022 <1.0 58.7 <1.0 <1.0 56.7
Shaded indicates concentrations exce&d1ng GWQS
H = Sample was analyzed beyond holding times and may not be accureate concentration
Nitrate, Nitrate + Nitrite
I10mn/Ll
4.26
5.11
5.63
4.2
2.14
2.46
2.25
1.21
5.09
1.19
4.48
~ 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 uii
2.19
1.58
1.74
1.80
2.31
1.57
1.34
180
1.20
1.82
2.56
1.63
1.50
2.22 {"91
1.62
1.64
1.92
2.13
2.06
2.32
2.36
2.i"i'
2.34
2.04
2.09
1.94
2.13
1.82
2.01
2.00
2.16
1.61
1.AA
2.44
3.26
3.58
3.71
0.12 H
4.62
6.25
4.33
4.65
3.80
3.70
4-34
Sampling Event
TABLE 1 (31 of 33)
Historic Summary Of Monitoring Well Analytical Results Up To The 2nd Quarter 2022
Chloroform Contamination Investigation
DUSA WMe Mesa Mill
'-;'---~1-=';;~;;;~;!•·:~;=•~~----------l
. 5/22/2014 <1.0 . sifai26i4 <1.0 . · · · · ·1·0,29/2014 .,·er
3111/2015 <1.0 · ei1 ii2ois •iii 9i3/2()15 <1 0 10/21/2015 <1.0 3/16/2016 <1.0 ........... si2s1261Ei <i .ci ..
•·•••·•·• . 8/:3/2()16 <1 CJ
1.64 1.93 169 . .... i.10
i.16 1.2i" ········· · · · ···· o:aea
0.458 0.368 0.925 o:eos 0.726
1----------"0.612 0.674 ······················o:izt ········· ... 0.733 · ··· · · ····· ··· · · o.ii4
0.784 0.737 ciati ci.736
'------+='-------1-------"=-i-------"·· 0.889 0.859 ci.994 1st Qtr 3/16/20 <1.0 2nd at, ····· ai1s,2019 <1.0 ari.lair ...... 9/1ii2019 <fo ;jii, air ....... i211412619 :.:1.6 1stQtr 3117/2020··1-<---;1'-;.o'------+---'"-"----+-c-",-----+~;-------l------
2nd air ai1 oi2020 • 1.0 a,c1 air . . .. . . 9111i2020 •1.6
4th air 11i<ii:fo201-"'-'i""'o'--··· _____ -1-='----l--'-=-----1 1st Qtr 3/17/2021 <1.0 2nc:i ai, ei1s,20:21 :.1 o ·· ·· :iri.l air ·· · · · · 9@2021 :c1.o
4th air i2ia12021 <i.o i"st"<:i1r 3115120221-<---;1'-;.o,--------+---'"-"-----t
2i,ci atr 6/1612022 <1.o
TW4-35 ........ ai:di201,i •1.0
1cii2si2014,._<~1=0~·------1-~~--_,_=---------< 3/11/2015 <1.0 ·si10,201s •i.o··· 9i3t2015 <1.0 10/28/2015 <1.0 3116/2016 <1.0 · si2a1201a "1 o
8/3/2016 <1 ci 1ci12oi201s :.1.0 1st Qtr 3/15/2017 <1.0 2nc1air ······· · · ·s11s,201i •i.o··
ard air · s&201-; •i a· ;;ii, air··· · ·· · 10110,20w •1 o
1st Qtr 3114/2018 <1.0 2nc16ir ei1:ii2ci1a •1.0
······· ... ····· ci.934
107
1.090 1.240 . ci.iliii . 1:04
6.2 .. 0.351
0.436 · ··· o:-is2
0.304 0.419 0.521 6Ei:ii · a:12s . ci.626
0.673 0699 o:iri'o . ci.651 0.740 ·o.aEi2 · · a:s21 3rd Qtr sisoi2oia <i:ci 4tiiair ...... 12/12/2018 <10 '------+='-------1--------==-------·,,.o, ... 1st Qtr 3/16/2019 <1.0 2ndair ········· · ·si1:i,201!i •1.0··
3rd air 9Jiii2ciis •1.0 ,iii, air · · · 1211412019 :c1o 1stQtr 3117/2020 <1.0'--------1 2nc1 air · · · · · eiiii2020 •1 o 3rd Qtr sii1i2ci26 <io
4iiiair · 1114)2020,.<_1~··0~·· ·-----------1~~--.... ·'-'"------1--'--'-'-"-------1----------""""+-------1st Qtr 3/17/2021 <1.0 2nil air ei1612ci21 •i .ci 3rd Qtr 9/15/2021 <1.0 ,iii, air············ 121a,2021 :c1.o 1st Qtr 312212022•1-<'--'1"".o'--------1
2ric1air · siisi2022 •io
TW4-37
(chloroform pumping well
619115)
Sampling Event
2nd Qtr 6/8/2015
3rdQtr 9/3/2015
4thQtr 10/19/2015
1stOtr 3/9/2016
2ndOtr 5/2312016
3rd Qtr 7/25/2016
4th Qtr 10/12/2016
1stOtr 3/8/2017
2ndQtr 6/15/2017
3rd Qtr 7/26/2017
4thQtr 10/11/2017
1stQtr 3/12/2018
2nd Qtr 6/8/2018
3rdQtr 8/22/2018
4th Qtr 11/28/2018
1stQtr 3/8/2019
2ndQtr 6/5/2019
3rd Qtr 9/4/2019
4thQlr 12/10/2019
1stQtr 2/19/2020
2nd Qtr 5/27/2020
3rdQtr 9/4/2020
4thQtr 10/28/2020
1stOtr 2123/2021
2ndQtr 6/9/2021
3rd Qtr 8/24/2021
4th Qtr 12/1/2021
1stQtr 3/9/2022
2nd Qtr 6/8/2022
TW4-38
th Qtr 11/10/2016
stQtr 3/15/2017
nd Qtr 6/15/2017
rdQtr 8/2/2017
.th ()t, 10/10/2017
1stOtr 3/14/2018
2nd Qtr 6/13/2018
3rd Qtr 8/30/2018
4thQtr 12/12/2018
1stOtr 3/16/2019
2ndQtr 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
3rdQtr 9/18/2020
4thQtr 11/4/2020
1stQtr 3/18/2021
2nd Qtr 6/16/2021
Duplicate TW4-70
3rd Qtr 9/15/2021
4th Qtr 12/8/2021
1stQtr 3/22/2022
2ndQtr 6/16/2022
TW4-39(chloroform pumping well
(11'2016)
4thQtr 11/11/2016
1stQtr 3/8/2017
2nd Qtr 6/15/2017
3rd Qtr 7/26/2017
4th Qtr 10/10/2017
1stOtr 3/12/2018
2ndQtr 6/8/2018
3rd Qtr 8/22/2018
4th Qtr 11/28/2018
1stQtr 3/8/2019
2ndQtr 6/5/2019
3rdQtr 9/4/2019
4th Qtr 12/10/2019
1stQtr 2/19/2020
2nd Qtr 5/27/2020
3rdQtr 9/18/2020
4thQtr 10/28/2020
1stQtr 2/23/2021
2nd Qtr 6/9/2021
3rdQtr 8/24/2021
4thQtr 12/1/2021
1stQtr 3/9/2022
2ndQtr 6/8/2022
TABLE 1 (32 of 33)
Historic Summary Of Monitoring Well Analytical Results Up To The 2nd Quarter 2022
Chloroform Contamination Investigation
DUSA White Mesa Mill
Parameter
(GWQS)
Carbon Tetrachloride Chloroform Chloromethane Methylene Chloride Chloride
(Sµg/L) (70 µg/L) (30 µg/L) (5 µg/L) No GWQS (mQ/Ll
18.2 30,200 15.7 1.94 345
16.6 19,100 13.7 1.04 374
12.5 19 500 9.38 1.17 399
15.8 17,500 3.57 1.34 332
14.4 16,200 3.57 1.17 389
16.7 15,900 <1.0 <1.0 294
16.3 16.400 <1.0 <1.0 304
15.4 18,000 3.57 1.34 305
16.2 15,800 <1.0 <1.0 281
15.1 15,000 <1.0 <1.0 277
12.6 15,500 2.47 <1.0 255
12.8 12,900 1.14 <1.0 263
10.6 14,400 <1.0 <1.0 275
12.1 14,100 6.2 <1.0 387
11.3 15,200 19.8 <1.0 264
13.8 13,300 1.24 <1.0 209
14.6 16,200 <1.0 <1.0 250
10.7 11,900 1.9 <1.0 228
8.81 13,100 3.12 <1.0 220
8.53 12,000 12.3 <1.0 236
11.8 11,700 1.44 <1.00 321
9.62 13,800 <1.0 <1.0 273
6.52 10 300 29.4 <1.0 254
<1.0 9,380 <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 6.7 5.05 410
12.2 13,700 <1.0 <1.0 414
8.2 46800 12 <1.0 276
<1.0 <1.0 <1.0 <1.0 40
<1.0 <1.0 <1.0 <1.0 35.7
<1.0 <1.0 <1.0 <1.0 36.2
<1.0 <1.0 <1.0 <1.0 36.9
<1.0 <1.0 <1.0 <1.0 31.3
<1.0 <1.0 <1.0 <1.0 36.5
<1.0 <1.0 <1.0 <1.0 33.1
<1.0 <1.0 <1.0 <1.0 39.2
<1.0 <1.0 <1.0 <1.0 35.0
<1.0 <1.0 <1.0 <1.0 33.5
<1.0 <1.0 <1.0 <1 .0 33.7
<1.0 <1.0 <1.0 <1 .0 35.3
<1.0 <1.0 <1.0 <1.0 31.6
<1.0 <1.0 <1.0 <1.0 36
<1.0 <1.0 <1.0 -=1.0 33.4
<1.0 <1.0 <1.0 <1.0 34.9
<1.0 <1.0 <1.0 <1.0 34.7
<1.0 <1.0 <1.0 <1.0 35.1
<1.0 <1.0 <1.0 <1.0 37.2
<1.0 <1.0 <1.0 <1.0 37.7
<1.0 <1.0 <1.0 <1.0 35.7
<1.0 <1.0 <1.0 <1.0 32.1
<1.0 <1.0 <1.0 <1.0 35.8
<1 .0 <1.0 <1.0 <1.0 32.7
<1.0 <1.0 <1.0 <1.0 37.3
<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 1,650 <1.0 <1.0 74.7
<1.0 812 <1.0 <1.0 76.5
7.56 5,870 <1.0 <1.0
88:f 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~, <1.0 776 <1.0 <1.0 82.4
<1.0 724 <1.0 <1.0 75.21
1.4 982 <1.0 <1.0 76.8
Shaded indicates concentrat1ons exceeding GWQS.
Nitrate, Nitrate + Nitrite
(10 mQ/Ll
35.2
32.4
34.6
28.4
27.9
33.4
26.1
32.3
31.2
30.5
30.6
30.0
28.6
25.3
27.3
30.1
31.2
25.8
25.5
28.3
28.3
29.5
28.7
26.9
26.6
25.8
31.3
29.8
28.0
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
20.7 5':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 __gg
2.70
2.33
2.9
9.0
TW4-40
(chloroform pumping well
5/2019)
Sampling Event
TABLE 1 (33 of 33)
Historic Summary Of Monitoring Well Analytical Results Up To The 2nd Quarter 2022
Chlorofonn Contamination Investigation
DUSA White Mesa Mill
Parameter
(GWQS)
Carbon Tetrachloride Chloroform Chloromethane Methylene Chloride Chloride
15 ua/Ll 170 µg/L) (30 µg/L) (5 µg/Ll No GWQS (mQ/Ll
1stQlr 3/21/2018 <1.0 248 <1.0 <1.0 35.7
2ndQtr 6/13/2018 <1.0 131 <1.0 <1.0 31.6
3rd Qtr 9/5/2018 <1.0 116 <1.0 <1.0 37.6
4th Qtr 12/12/2018 <1.0 118 <1.0 <1.0 29.9
flrl'm:i;;w•-?s 3/20/2019 <1.0 119 <1.0 <1.0 32.3
<1.0 111 <1.0 <1.0 30.9
2nd Qtr ----6/5/2019 <1 .0 ------lo---------<1.0 ------263 <1.0 35.6
3rd Qtr 9/4/2019 <1.0 380 <1.0 <1.0 35.9
4th Qtr 12/10/2019 <1.0 314 <1.0 <1.0 36.7
1stQtr 2/19/2020 <1 .0 364 <1.0 <1.0 38.5
2nd Qtr 5/27/2020 <1.0 367 <1.0 <1.0 36.5
3rdQtr 9/4/2020 <1.0 333 <1 .0 <1.0 34.2
4thQtr 10/28/2020 <1.0 264 <1.0 <1.0 34.6
1stQtr 2123/2021 <1.0 436 3.51 <1.0 36.0
2ndQtr 6/9/2021 <1.0 343 <1.0 <1.0 27.5
3rd Qtr 8/24/2021 <1.0 301 1.32 <1.0 31.8
4thQtr 12/1/2021 <1.0 286 <1.0 <1.0 38.4
1stQtr 3/9/2022 <1.0 238 <1.0 <1.0 368
2nd Qtr 6/8/2022 <1.0 323 <1.0 <1.0 36.6
TW4-41 (chlorororm pumping -11
512018)
2nd Qtr 5/8/2018 <1.0 1,400 <1.0 <1.0 42.8
3rdQtr 8/22/2018 <1.0 1,390 <1.0 <1.0 45.5
4thQtr 11/28/2018 <1.0 1,320 <1.0 <1.0 41.4
1stQtr 3/8/2019 <1.0 1,220 <1.0 <1.0 39.1
2ndQtr 6/5/2019 <1.0 1,320 <1.0 <1.0 38.1
3rd Qtr 9/4/2019 <1.0 1,190 <1.0 <1.0 39.4
4th Qtr 12/10/2019 <1.0 1,410 <1.0 <1.0 42.1
1stQtr 2119/2020 <1.0 1,200 <1.0 <1.0 44.4
2ndQtr 5/27/2020 <1.0 1,220 <1.0 <1.0 41.7
3rdQtr 9/4/2020 <1.0 1,110 <1.0 <1.0 40.2
4thQtr 10/28/2020 <1.0 1 020 <1.0 <1.0 39.7
1st Qtr 2123/2021 <1.0 1,170 <1.0 <1.0 40.6
2nd Qtr 6/9/2021 <1.0 1,130 <1.0 <1 .0 39.5
3rd Qtr 8/24/2021 <1.0 1,100 <1.0 <1 .0 37.1
4th Qtr 12/1/2021 <1.0 1,030 <1.0 <1 .0 43.2
1stQtr 3/9/2022 <1.0 1,030 <1.0 <1 .0 37.3
2ndQtr 6/8/2022 <1.0 1 010 <1.0 <1.0 41.1
TW4-42
2ndQtr 6/19/2019 <1.0 <1.0 <1.0 <1.0 23.3
3rd Qtr 9/11/2019 <1.0 <1.0 <1.0 <1.0 20.6
4th Qtr 12/10/2019 <1.0 <1.0 <1.0 <1.0 22.6
Du.elicate TW4•75 <1.0 <1.0 <1.0 <1.0 22.6
1s1Qtr 2/17/2020 <1.0 <1.0 <1.0 <1.0 23.2
2nd Otr 6/10/2020 <1.0 <1.0 <1.0 <1.0 23.1
3rdQtr 9/17/2020 <1 .0 <1.0 <1.0 <1 .0 23.5
4thQtr 11/4/2020 <1.0 <1.0 <1.0 <1.0 22.4
1stQtr 3/17/2021 <1 .0 <1.0 <1.0 <1.0 24.2
2ndQtr 6/15/2021 <1 .0 <1.0 <1.0 <1.0 24.6
3rdQtr 9/15/2021 <1.0 <1.0 <1.0 <1.0 16.6
4th Qtr 1219/2021 <1.0 <1.0 <1.0 <1.0 24.2
1stQtr 3/15/2022 <1.0 <1 .0 <1 .0 <1.0 21 .5
Duplicate TW4-65 <1.0 <1.0 <1.0 <1.0 17.7
2ndQtr 6/15/2022 <1.0 <1.0 <1.0 <1.0 24.0
TW4-43
4th Qtr 12/9/2021 <1.0 1<1.0 1<1.0 1<1.0 I 40.61
1stQtr 3/17/2022 <1.0 <1 .0 <1.0 <1.0 39.2
2ndQtr 6/16/2022 <1.0 <1.0 <1 .0 <1.0 41.8
Shaded indicates concentrations exceeding GWOS.
(21 Chtoroform_eummg~ell started m Ma1,2019 ______ _
Nitrate, Nitrate + Nitrite
(10mg/Ll
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
6.54
6.13
6.02
6.71
6.00
6.22
6.11
6.12
6.78
6.69
6.25
6.41
7.45
3.77
6.72
6.2
6.0
2.57
2.75
2.82
2.95
2.88
3.23
3.65
2.77
315
3.57
3.26
2.02
2.5
2.6
3.3
0.118!
0.4
0.24
Parameter GWQS
Chloride none
Nitrate + Nitrite (as N) 10 mq/L
Chloroform 70 µq/L
Carbon tetrachloride 5 up/L
Chloromethane 30 up/L
Methvlene Chloride 5 ua/L
nc = not calculated
Table 2
Summary of EFR QA/QC Samples
2nd Quarter 2022
Duplicate Samples of Wells
Duplicate of TW4-42 Duplicate of TW4-38
TW4-42 TW4-65 RPO TW4-38 TW4-70 RPO
24.0 22.7 5.6 37.3 33.7 10.1
3.30 2.7 20.0 7.9 8.2 -3.7
<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 bf TW4-18
TW4-18 TW4-75 RPO
48.1 41 .4 15.0
3.40 3.3 3.0
62.9 53.2 16.7
<1 .0 <1 .0 nc
<1 .0 <1 .0 nc
<1 .0 <1.0 nc
Well ID MW4 MW-26 TW4-1
<1>chloroform (ug/L) 1,010 611 914
Chloroform (gill 1.01E-03 6.11 E-04 9.14E-04
Chloroform (lbs/L) 2.23E-06 1.35E-06 2.02E-06
Chloroform (lbs/qal) 8.45E-06 5.11E-06 7.64E-06
Total gallons pumped 93,554.5 29,385.9 7,616.0
lbs of chloroform removed 0.8 0.15 0.06
Gallons of chloroform removed 0.06 0.01 0.00
total lbs of chloroform removed 21.8
total aallons of chloroform removed 1.8
Tabel 3
Chloroform Mass Removal Calculations for the 2nd Qurater 2022
EFR White Mesa Mill, Bland, Utah
TW4-2 TW4-4 TW4-11 TW4-19 TW4-21 1W4-22
892 1,110 2,550 2,540 657 2,600
8.92E-04 1.11E-03 2.SSE-03 2.54E-03 6.57E-04 2.60E-03
1.97E-06 2.45E-06 5.63E-06 5.61E-06 1.45E-06 5.74E-06
7.46E-06 9.28E-06 2.13E-05 2.12E-05 5.49E-06 2.17E-05
11 ,518.1 11 ,463.2 1,473.1 123,246.5 91 ,682.5 22,489.0
0.09 0.1 0.03 2.6 0.5 0.5
0.01 0.01 0.00 0.21 0.04 0.04
1) Assuming that the chloroform concentration result for the quarter monitoring event 1s the average chloroform concentration for the entire quarter.
Chloroform Pumping Wells
itrate Pu · Wells
1W4-24 1W4-25 TW4-37 TW4-39 TW4-40 TW4-41
124 0 46,800 982 323 1,010
1.24E-04 0.00E+00 4.68E-02 9.82E-04 3.23E-04 1.01 E-03
2.74E-07 0.00E+00 1.03E-04 2.17E-06 7.14E-07 2.23E-06
1.04E-06 0.00E+00 3.91E-04 8.21E-06 2.70E-06 8.45E-06
50,341.7 101,724.9 41,998.3 31 ,354.2 52,135.2 11 ,013.9
0.052 0.00 16.4 0.3 0.14 0.1
0.004 0.00 1.34 0.02 0.01 0.01