DRC-2021-024003 - 0901a068810471de

MEMORANDUM
pk,6 / 275 (2.0z Phil Goble
Dean Henderson
December 30, 2021
Department of
Environmental Quality
Kimberly D. Shelley
Executive Director
DIVISION OF WASTE MANAGEMENT
AND RADIATION CONTROL
Douglas J. Hansen
Director D'RC-2021-024-003
SPENCER J. COX
, Governor
DEIDRE HENDERSON
Lieutenant Governor
State of Utah
TO:
FROM:
DATE:
SUBJECT: Review of the November 17, 2021 3rd Quarter, 2021 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
November 17, 2021 3rd Quarter, 2021 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.0 requires the 3rd Quarter Report to be submitted to the Division on or before December
1, of each year. The Report was received by the Division on November 22, 2021 (date of Report
November 17, 2021) which meets the GCAP requirement.
Monitor Well Sampling
monitor wells were sampled as required in the GCAP (see Table 1 below): The following 42
MW-4 TW4-3
MW-26 TW4-4
MW-32 TW4-5
TW4-1 TW4-6
TW4-2 TW4-7
TW4-8
TW4-9
TW4-10
TW4-11
TW4-12
TW4-13 TW4-21
TW4-14 TW4-22
TW4-16 TW4-23
TW4-18 TW4-24
TW4-19 TW4-25
TW4-26
TW4-27
TW4-28
TW4-29
TW4-30
TW4-31
TW4-32
TW4-33
TW4-34
TW4-35
TW4-36 TW4-41
TW4-37 TW4-42
TW4-38
TW4-39
TW4-40
DRC-20 195 North 1950 West • Salt Lake City, UT
Mailing Address: P.O. Box 144880 • Salt Lake City, UT 84114-4880
Telephone [phone] • Fax [phone] • T.D.D. [phone]
www.deq.utah.gov
Printed on 100% recycled paper
Page 2
The water samples for the above wells were analyzed for the following constituents as required in the
QAP:
Chloroform Chloride
Chloromethane Methylene chloride
Carbon tetrachloride Nitrate + Nitrite as Nitrogen.
The analytical methods used is consistent with the requirements of the GCAP. For a summary of the 3rd
Quarter, 2021 and historic analytical results see Table 1 below.
Groundwater Head Monitoring
Depth to groundwater was measured in the following wells and/or piezometers, as required in Part I.E.3
of the Permit:
• The quarterly groundwater compliance monitoring wells.
• Existing monitoring well MW-4 and all of the temporary chloroform investigation wells.
• Piezometers P-1, P-2, P-3A, P-4 and P-5.
• MW-20 and MW-22.
• Nitrate monitoring wells.
• The DR piezometers which were installed during the Southwest Hydrologic Investigation.
In addition, weekly and monthly depth to groundwater measurements were taken in pumping wells
MW-4, MW-26, TW4-1, TW4-2, TW4-4, TW4-11, 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, and TW4-42.
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 TW4-3 and its duplicate sample TW4-65, and
TW4-8 and its duplicate sample TW4-70; and MW-32 and its duplicate sample TW4-75. All analytical
results for the three sample/duplicate pairs were within the 20% relative percent difference (RPD)
acceptance limits (see Table 2 below).
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 3rd Quarter 2021 is 14.4 lbs. (see Table 3 below) which is more than the estimated 11.8 lbs.
removed in the 2nd Quarter 2021. The lesser mass removal is a primarily due to increase in
concentrations in TW4-19.
Using the "Chloroform Plume Mass Calculation Method" as described in Appendix A of the GCAP the
residual mass of chloroform within the plume is estimated as 933 lbs. in the 3rd Quarter, 2021. This
approximately 149 lbs. larger than the 2nd Quarter 2021 estimated mass of 784 lbs.
As per Part III.B.2 of the GCAP, the electronic files were used in 3rd Quarter, 2021 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 1.1g/1 in the 3rd Quarter, 2021 and corresponding log equivalent values.
• Surfer® griding parameters: kriging parameters: SURFERTM default parameters (point kriging,
linear variogram, slope = 1, no anisotropy [anisotropy = 11, no search constraints; min x, max x
Page 4
(UTME[m]): 631900, 633043; min y, max y (UTME[m]): 4154240, 4155550.64; grid spacing in
x, y (m): 15.24, 15.24
• Surfer chloroform concentration grid file.
• Concentration GE 70 Grid file
• Intermediate Surfer Grid Files: water level grid; aquifer base grid; saturated thickness grid
Based on the review of these files it appears that the date entered and generated is appropriate to
calculate an estimated chloroform mass within the chloroform plume and EFRI followed Part III.B.2 and
Appendix A of the GCAP.
Reporting
The Report included the following information as required in the QAP:
a) Introduction
b) Sampling and Monitoring Plan
-Description of monitor wells
-Description of sampling methodology, equipment and decontamination procedures
-Identify all quality assurance samples, e.g. trip blanks, equipment blanks,
duplicate samples
c) Data Interpretation
-Interpretation of groundwater levels, gradients, and flow directions.
Interpretations will include a discussion on: 1) A current site groundwater
contour map, 2) hydrographs to show groundwater elevation in each
monitor well over time, 3) depth to groundwater measured and
groundwater elevation from each monitor well summarized in a data table,
that includes historic groundwater level data for each well, and 4) an
evaluation of the effectiveness of hydraulic capture of all contaminants of
concern.
-Interpretation of all analytical results for each well, including a discussion
On: 1) a current chloroform isoconcentration map with one of the
Isoconcentration lines showing the 70µg/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.
Page 5
0 Copies of DUSA field records, laboratory reports and chain of custody forms.
Evaluation of the Chloroform Contaminate Plume and Its Associated Contaminants
Bounding Chloroform Plume
Groundwater monitoring data up to the 3rd Quarter, 2021 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 p.g/L ("GWQS = 70 µg/L)
with the exception of TW4-24 (103 i.tg/L) and TW4-30 (78.7m/L). TW4-24 is a pumping well and
bounds the Plume to the west. Should TW4-24 chloroform concentrations exceed GWQS in the 4th
quarter 2021 addition monitoring well may need to be installed to bound the Plume at this location.
TW4-30 has exceeded the chloroform GWQS for the fourth consecutive quarterly monitoring event (4th
quarter 2020, 1st quarter 2021, 2nd quarter 2021, 3rd quarter 2021). As required in Part GCAP Part II.H
EFRI on November 8, 2021, submitted to the Division, by email, an As-Built report for new well TW4-
43, located approximately 200 feet down gradient of TW4-30, that was installed the week of September
13, 2021. TW4-43 will be sampled for the first time in the 4th quarter 2021 and the analytical results for
chloroform concentrations in this will determine if the Plume is bound or another well needs to be
installed to bound the Plume down gradient of TW4-43.
Performance Monitor Wells ("PM") [Wells Exceeding Chloroform Concentrations GWQS of 70u.g/L1
Seven (7) PM wells still exceed 70 [tg/L: TW4-7, TW4-10, TW4-16, TW4-26, TW4-29, TW4-30, and
TW4-40.
Compliance Monitor Wells ("CM") [Wells with Chloroform Concentrations between < 1 and 70gg/L1
Seven (7) CM wells range with detectable chloroform concentration but still below 70[Ig/L: TW4-5,
TW4-6, TW4-8, TW4-9, TW4-18, TW4-27 and TW4-33.
CM Wells Below the Laboratory Chloroform Detection Limit (<1.0 tig/L)
Fourteen (14) CM wells were below the laboratory detection limit for chloroform (<1.0 pg/L): MW-32,
TW4-3, TW4-12, TW4-13, TW4-14, TW4-23, TW4-28, TW4-31, TW4-32, TW4-34, TW4-35, TW4-
36, TW4-38, and TW4-42.
Pumping Wells
There are 15 pumping wells in full operation in the 3rd Quarter, 2021, 14 pumping wells MW-4, MW-
26, TW4-1, TW4-2, TW4-4, TW4-11, TW4-19, TW4-21 TW4-22, TW4-24, TW4-37, TW4-39, TW4-
40, and TW4-41 exceed chloroform concentrations of 70 !AWL. Pumping well TW4-25 had a non-
detectable (<1.0 40 chloroform concentration (see table 1 below).
Nitrate, Nitrate + Nitrite ("nitrate") Concentrations
Pumping wells TW4-22 (35.1 mg/L) and TW4-24 (26.7mg/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 ("NCAP"), approved on December 12, 2012.
Page 6
Well TW4-26 (12.1 mg/1) continue to exceed the nitrate GWQS of 10 mg/l. The source of nitrate may
be from the chloroform source plume. Pumping well TW4-40 located approximately 200 feet down
gradient of TW4-26 and should remove and prevented further elevated nitrate concentrations migrating
downgradient in this vicinity. Nitrate concentrations at TW4-40 are currently at 1.5 mg/l. Therefore, at
this time no action is recommended. However, should future nitrate concentrations in TW4-40 increases
to above 10 mg/1 an additional investigation may be recommended.
Well TW4-27 (21.1 mg/L) continue to exceed the nitrate GWQS of 10 mg/l. 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 3rd quarter 2021
below the nitrate GWQS of 3.29 mg/L, 2.6 mg/L, and 0.46 mg/L respectively. Therefore, at this time no
action is recommended. However, should future nitrate concentrations in these three down and/or cross
gradient wells increases to above 10 mg/L or shows an increasing trend an additional investigation may
be recommended.
Conclusions on Compliance with the Permit and QAP
Per the Division review it appears that the Report complies with Permit, QAP, and GCAP. Therefore, a
letter will be drafted notifying EFR of the review and closing out of for the November 17, 2021, 3rd
Quarter, 2021 Chloroform Monitoring Report for the chloroform contamination investigation.
Page 7
References
EFRI, State of Utah Stipulated and Consent Order ("SCO") Docket Number UGW-20-01 White
Mesa Mill - Energy Fuels Resources (USA) Inc. ("EFRI") Plan and Time Schedule, Revision 1,
Pursuant to Part 1111.2 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, Notice of Violation and Corrective Action Order UDEQ
Docket No. UGW-20-01 Notice Pursuant to the Chloroform Pumping well Operations and
Maintenance plan, Letter August 5, 2020. (DRC-2020-013810)
URI, White Mesa Uranium Mill Chloroform Monitoring Report 4th (October through
December) Quarter 2020, February 22. 2021 (DRC-2021-002766)
EFRI, White Mesa Uranium Mill Chloroform Monitoring Report 1st (January through March)
Quarter 2021, May 10, 2021. (DRC-2020-018798)
EFRI, Stipulation and Consent Order ("SCO-) Docket Number UGW-20-01 White Mesa Mill -
Energy Fuels Resources (USA) Inc. ("EFRI") Plan and Time Schedule ("Plan"), Pursuant to Part
II.H.2 of the Groundwater Corrective Action Plan ("GCAP")included as Attachment 1 to the
SCO, July 7, 2021.
Utah DEQ QWMRC, July 7, 2021, Stipulation and Consent Order Docket Number UGW-20-01
White Mesa Mill - Energy Fuels Resources (USA) Inc. Plan and Time Schedule ("Plan"),
Pursuant to Part II.H.2 of the Groundwater Corrective Action Plan included as Attachment 1 to
the SCO. Approval, July 21, 2021. (DRC-2021-009822)
Page 8
BLANK PAGE
Page 9
Tables 1 through 3
TABLE 1 (1 of 33)
Historic Summary Of Monitoring Well Analytical Results Up To The 3rd Qarter 2021
Chloroform Contamination Investigation
DUSA White Mesa Mill
MW-4 (chloroform pumping well started pumping 3/4/03)
Sampling Event
Parameter
(GWQS)
Carbon Tetrachloride
(5 pg/L)
Chloroform
(70 pg/L)
Chloromethane
(30 pg/L)
Methylene Chloride
(5 pg/L)
Chloride
No GWQS (mg/L)
Nitrate, Nitrate + Nitrite
(10 mg/L) 1st Qtr 3/16/2005 NA 2,900 NA NA NA 6.3
2nd Qtr 5/25/2005 NA 3,170 NA NA NA 7.1 3rd Qtr 8/31/2005 <10 3,500 <10 <10 NA 7.0 4th Qtr 12/7/2005 <50 3,000 <50 <50 53 7.0
1st Qtr 3/9/2006 <50 3,100 <50 <50 49 6.0 2nd Qtr 6/14/2006 <50 3,000 <50 <50 49 6.0 3rd Qtr 7/20/2006 <50 2,820 <50 <50 48 1.2
4th Qtr 11/8/2006 2.1 2 830 1.4 <1.0 50 ......... 6.4 ............. 1st Qtr 2/28/2007 1.6 2,600 <1.0 <1.0 47 6.3 2nd Qtr 6/27/2007 1.8 2,000 <1.0 <1.0 45 7.0 3rd Qtr 8/15/2007 1.9 2,600 <1.0 <1.0 47 6.2 4th Qtr 10/10/2007 1.7 2,300 <1.0 <1.0 45 6.2 1st Qtr 3/28/2008 1.7 2,400 <1.0 <1.0 42 as 2nd Qtr 6/25/2008 1.8 2,500 <1.0 <1.0 42 6.1 3rd Qtr 9/10/2008 1.8 1,800 <1.0 <1.0 35 6.4
4th Qtr 10/15/2008 1.7 2 100 <1.0 <1.0 45 5.9 1st Qtr 3/4/2009 1.5 2200, <1.0 <1.0 37 5.7 2nd dtr 6/23/2009 1.3 1,800 <1.0 <1.0 34 5.2 3rd Qtr 9/14/2009 1.4 2,000 <1.0 <1.0 43 5.3 4th Qtr 12/14/2009
1st Qtr 2/17/2010
1.6
1.2
1,800
1,600
<1.0
<1.0 •
<1.0
<1.0
44 ... . -4-5.
5.8 ........ .4.0 2nd Qtr 6/14/2010 1.2 2,100 <1.0 <1.0 41 5.1 3rd Qtr 8/6/2010 1.5 1,900 <1.0 <1.0 38 4.8 4th Otr 10/15/2010 1.4 1,500 <1.0 <1.0 41 .............. 4.9 ......... 1st Qtr 2/23/2011 1.5 1,700 <1.0 <1.0 40 4.6
2nd Qtr 6/1/2011 1.4 1,700 <1.0 <1.0 35 4.9 3rd Qtr 8/17/2011 1.1 1,700 <1.0 <1.0 41 4.9 4th Qtr ..11/1.6/2011. 1.3 1 600 <1.0 <1.0 40 5:1 •Tif .0-(T) - ..1/215.1. 1 1,500 <1.0 <1.0 41.0 4:8
2nd Qtr 6/6/2012 1.2 1,400 <1.0 <1.0 39.0 - 4.6 3rd Qtr 9/4/2012 1.5 1,500 <1.0 <1.0 41.0 5.0 4th Qtr 10/4/2012 1 1 300 <1.0 <1.0 41.0 4.8 1st Qtr 2/11/2013 1.48 1,670 <1.0 <1.0 37.8 4.78 2nd Qtr 6/5/2013 1.31 1,490 <1.0 <1.0 44.0 4.22
3rd Qtr 9/3/2013 1.13 1,520 <1.0 <1.0 41.4 4.89
4th Qtr 10/29/2013 5.58 12410 <1.0 <1.0 40.1 5.25 1st Qtr 1/27/2014 4.15 1,390 <1.0 <1.0 38.5 4.7 2nd Qtr 5/19/2014 5.21 1,390 <1.0 <1.0 39.9 4.08 3rd Qtr 8/11/2014 7.6 1,490 <1.0 <1.0 41.0 3.7 4th Qtr 10/21/2014 <1.0 1,440 <1.0 <1.0 41.5 5.07
1st Qtr (2) 3/9/2015 1.26 1,400 <1.0 -<1.0 40.7 5.76 2nd Qtr 6/8/2015 <1.0 1,300 <1.0 <1.0 43.1 2.53 3rd Qtr 8/31/2015 <1.0 1,200 1.42 <1.0 44.3 4.79
4th Qtr 10/19/2015 <1.0 1 200 <1.0 <1.0 40.8 4.43
1st Qtr 3/9/2016 <1.0 1,240 <1.0 <1.0 42.2 5.15 2nd Qtr 5/23/2016 1.44 1,580 <1.0 <1.0 43.7 4.54 3rd Qtr 7/25/2016 <1.0 1,430 <1.0 <1.0 42.5 4.95 4th Qtr 10/12/2016 1.24 1,470 <1.0 <1.0 44.8 4.88 1st Qtr 3/8/2017 1.22 1,450 <1.0 <1.0 43.3 4.99
2nd Qtr 6/13/2017 1.15 1,430 <1.0 <1.0 44.0 4.88
3rd Qtr 7/26/2017 1.15 1,400 <1.0 <1.0 43.8 4.59 4th Qtr 10/11/2017 <1.0 1,320 <1.0 <1.0 43.8 5.25
DWMRC split sample <19 1 400 <30 70 J 43.0 5.1 1st Qtr 3/12/2018 1.07 1,320 <1.0 <1.0 46.2 4.47
2nd Qtr 6/8/2018 <1.0 1,240 <1.0 <1.0 43.5 4.64
3rd Qtr 8/22/2018 <1.0 1,300 <1.0 <1.0 48.5 4.55 4th Qtr 11/28/2018 <1.0 1 330 <1.0 <1.0 43.1 4.44 1st Qtr 3/8/2019 <1.0 1,190 <1.0 <1.0 41.5 5.05 2nd Qtr 6/5/2019 <1.0 1,300 <1.0 <1.0 40.6 5.16
3rd Qtr 9/4/2019 <1.0 1,180 <1.0 <1.0 41.9 4.69
4th Qtr 12/10/2019 <1.0 1,370 <1.0 <1.0 45.5 4.34 15t Qtr 2/19/2020 <1.0 1,2-30 <1.0 <1.0 48.1 6.22 2nd Qtr 5/27/2020 <1.0 1,250 <1.0 <1.0 40.7 5.04 3rd Qtr 9/4/2020 <1.0 1,240 <1.0 <1.0 43.8 4.93
4th Qtr 10/18/2020 <1.0 1 050 <1.0 <1.0 . .!11..:A 4.62 .................._. 1st Qtr 2/23/2021 <1.0 1,150 <1.0 <1.0 46.5 4.61
2nd Qtr 6/9/2021 <1.0 1,320 <1.0 <1.0 34.8 6.48
3rd Qtr 8/24/2021 <1.0 1,140 <1.0 <1.0 43.2 3.83
MW-4AaW4-Al 1st Qtr 3/16/2005 NA 3,700 NA NA NA 7.1
2nd Qtr 5/25/2005 NA 3,740 NA NA NA 7.8 3rd Qtr 8/31/2005 <10 3,800 <10 <10 NA 6.9
4th Qtr 12/7/2005 <50 3,000 <50 <50 55 6.7 ......... 1st Qtr 3/9/2006 <50 3,700 <50 <50 53 5.8.
2nd Qtr 6/14/2006 <50 3,300 <50 <50 54 7.3 3rd Qtr 7/20/2006 <50 3,190 <50 <50 54 1.2
4th Qtr 11/8/2006 2.4 3 370 <1.0 <1.0 54 7.1
1st Qtr 2/28/2007 1.9 2,500 <1.0 <1.0 60 7.1 Well abandonded
(1) As of March 2012 Do h north and y
(2) chloroform pumping wells TW4-1, .
NA= not analyzed
Shaded indicates concentrations exceeding GWQS.
Bold and italics indicates the MDL exceeded the GWQS.
J = Approximated value
TABLE 1 (2 of 33)
Historic Summary Of Monitoring Well Analytical Results Up To The 3rd Qarter 2021
Chloroform Contamination Investigation
DUSA White Mesa Mill
MW-26 (former TW4-15) Chloroform pumping well started 8/503
Sampling Event
Parameter
(GWQS)
Carbon Tetrachloride (5 pg/L) Chloroform (70 pg/L) Chloromethane (30 pg/L) Methylene Chloride (5 pg/L) Chloride No GWQS (mg/L) Nitrate, Nitrate + Nitrite (10 mg/L)
1st Qtr
2nd Qtr
3rd .Qtr 4th Qtr
1st Qtr
2nd Qtr
3rd Qtr
4th Qtr 1st Qtr
2nd Qtr
3rd Qtr
4th Qtr
1§t Qtr 2nd Qtr
3rd Qtr
4th Qtr
1st Qtr
2nd Qtr
3rd Qtr
4th Qtr
1st Qtr 2nd Qtr
3rd Qtr
4th Qtr
1st Qtr
2nd Qtr
3rd Qtr 4th Qtr
.(1) t* RI
Ind Qtr 3rd Qtr
4th Qtr
1st Qtr
2nd Qtr
3rd Qtr 4th Qtr
1st Qtr
2nd Qtr
3rd Qtr
4th Qtr 1st Qtr 2nd Qtr (3) -3rd Qtr
4th Qtr
1st Qtr
2nd Qtr
3rd Qtr 4th Qtr (4)
i st Qtr
2nd Qtr
3rd Qtr 4th Qtr
ist Qtr
2nd Qtr
3rd Qtr 4th Qtr 1st Qtr
2nd Qtr
3rd Qtr
4th Qtr
1st Qtr
2nd Qtr 3rd Qtr
4th Qtr 1st Qtr
2nd Qtr
3rd Qtr
3/16/2005
5/25/2005
8/31/2005 12/7/2005
3/9/2006
6/14/2006
7/20/2006
11/8/2006 2/28/2007
6/27/2007
8/15/2007
10/10/2007
3/28/2008 6/25/2008
9/10/2008
10/15/2008
11/18/2008
3/4/2009
6/23/2009
9/14/2009
12/14/2009
2/17/2010 6/14/2010
8/16/2010
10/15/2010
2/23/2011
5/31/2011
8/17/2011
11/16/2011 12/5/2011 2/27/2012
6/6/2012 9/4/2012
10/4/2012
2/11/2013
6/5/2013
9/3/2013 10/29/2013
1/27/2014
5/19/2014
8/11/2014
10/21/2014 3/9/2015 6/8/2015
8/31/2015
10/19/2015 • 3/9/2016
5/23/2016
7/25/2016
NA
NA
<5.0
'<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
NA <1.0
<1.0
<1.0
<1
<1
<1
<1.0
<1.0 <1.0
<1.0
<1.0
<1.0
<1.0 <1.0 <1.0
<1.0
<1.0 <1.0
<1.0
1.2
.
NA
NA
..
..
310
442
960 1,000
1,100
830
2,170
282 570 300
1,400
2 000
930 1,300
630
1 700
950 410
850
1 100
730 1,600
2,200
970
450
1,800
720
10 ,80. .......... 2,400
3,000
3,100
1 200
2,1.20
4,030
2,940
.1,410
1,400
1,960
2,120
2090, 1,980
2,350
2,680
2,650
2,220
1,980
NA
NA
5.4
<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
NA <1 0 <1.0
<1.0 , <1 , <1
<1
<1.0
<1.0
<1
<1.0
<1.0
<1.0
<1.0 <1.0
<1.0
<1.0
.
8.7
4.05 1.32
NA
NA
<5.0 <50
<50
<50
<50
•
2.6
NA
NA
NA 55
52.
52
65
54 .. 56. 46
57
57
49 57 44
64
NA
49 46
46
60
57
40 49 65
57.
. 88
58
69
NA 98
73
73 68
81.9
77.9
60.5
72.3 59.4
53.4
59
60.1
56.5 62
69.6
68.3
66.2
62.6
NA
NA
0.3
0.2
a 2 0.3
0.2
0.2
1.4
0.3
. 0.6 6.4
1
0.6
0.1
0.6 6.2
0.1
0.4 0.2
0.1
2.3
0.2
6.8
0.6 0.7
0.5
0.4
0.9
2.0
1.7
2.5'
2.6 1.8
2.27
2.11
. 1.18
1.38 0.55
0.93
0.7
0.93
0.73 0.42
0.687
0.991 1.45 1.12
5.5
13
36
14
.40 53
24
NA
100
51
12
30
40
19
21 6.5
3.6
1.3
7.2
NA
2.9 16
21 31 4
9.34
52.4
33.2
4.03
13.8
15.4
26
23.2 27.4 11.2
11.6 8.28 4.66
4.57
,-
-
<1.0
-
,
<1.0 3,190 <1.0 7.81 66.4 1.57
10/12/2016
3/8/2017
6/13/2017
7/26/2017 10/11/2017
3/12/2018
6/8/2018
8/22/2018
11/28/2018 3/8/2019
6/5/2019
, 9/4/2019
12/10/2019
2/19/2020
6/12/2020 9/4/2020
10/28/2020 2/23/2021
6/6/2021
8/24/2021
<1.0
<1.0 .... <1.0
<1.0 <1.0
<1.0
<1.0
<1.0
<1.0 <1.0
<1.0
<1.0
<1.0
<1.0
<1.0 <1.0
<1.0 <1.0
<1.0 <1.0
2,510
1,290
2,450
1,230 2,570
1,210
1,870
1,680
..1,480 1,110
1,280
1,680
tpoo
1,100
1,140 1,130 866 3,060 998
1n580
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0 <1.0 <1.0
<1.0
<1.0
<1.0
<1.0 <1.0
<1.0 <1.0 <1J0 , <1.0
„..
‹1.0
<1.0
<1.0
<1.0
<1.0
<1.0 <1.0
4.31
7.65
7.59
5.26
7.83 2.14
9.19
2.2 1.19
1.93
1.78
2.57
3.46
- 66.2
58.4
64.3
61.4
62.2 60.3
58.7.
91.4
85.5
69.9 80.7 76.2 83,2
88.9
35.1
70,
37.4
59.5 48.6 46.6
1.18
0.766
0.922
1.56
1.18 1.57
0.901
2.80
1.96
1.85 2.83 3.08 0.977
1.17
2.93
0.42
3.62
0.349
0.81 0.671
(1) VOCs were resampled because laboratory missed holding me. (2) As of March 2012 both nonh and south wild life ponds no longer receiving water. Achloroforrrikrnanywell 1W4-37 started in 13/9115 (4) dilOrolOrm pumping wells TW4-1, TW4-2, and TW4-11 started in 1/14/15
NA = not analyzed Shaded indicates concentrations exceeding GWQS. Bold and italics indicates the MDL exceeded the GWQS.
TABLE 1 (3 of 33)
Historic Summary Of Monitoring Well Analytical Results Up To The 3rd Qarter 2021
Chloroform Contamination Investigation
DUSA White Mesa Mill
MW-32 (former TW4-17)
Sampling Event
Parameter
(GWQS)
Carbon Tetrachloride
(5 pg/L)
Chloroform
(70 pg/L)
Chloromethane
(30 pg/L)
Methylene Chloride
(5 pg/L)
Chloride
No GWQS (mg/L)
Nitrate, Nitrate + Nitrite
(10 mg/L)
1st Qtr 3/16/2005 NA <1.0 NA NA NA <0.1
2nd Qtr 5/25/2005 NA <1.0 NA NA NA <0.1 3rd Qtr 8/31/2005 <1.0 <1.0 3.2 <1.0 NA <0.1 4th Qtr 12/7/2005 <1.0 <1.0 <1.0 <1.0 33 <0.1
1st Qtr 3/9/2006 <1.0 <1.0 <1.0 <1.0 ••32 <0.1
2nd Qtr 6/14/2006 <1.0 <1.0 3.5 <1.0 30 <0.1
3rd Qtr 7/20/2006 <1.0 <1.0 1.8 <1.0 32 <1.0
4th Qtr 11/8/2006 <1.0 <1.0 1.5 <1.0 31 <.1 1st Qtr 2/28/2007 <1.0 <1.0 <1.0 <1.0 32 <1.0
2nd Qtr 6/27/2007 <1.0 <1.0 <1.0 <1.0 32 <1.0
3rd Qtr 8/15/2007 <1.0 <1.0 <1.0 <1.0 31 <1.0
4th Qtr 10/10/2007 <1.0 <1.0 <1.0 <1.0 32 <1.0
1st Qtr 3/28/2008 <1.0 <1.0 <1.0 <1.0 31 <.1 2nd Qtr 6/25/2008 <1.0 <1.0 <1.0 <1.0 29 <1.0
3rd Qtr 9/10/2008 <1.0 <1.0 <1.0 <1.0 30 <1.0
4th Qtr 10/15/2008 <1.0 <1.0 <1.0 <1.0 26 <0.05
1st Qtr 3/4/2009 <1.0 <1.0 <1.0 <1.0 30 <.1
2nd Qtr 6/23/2009 <1.0 <1.0 <1.0 <1.0 31 <0.1 3rd Qtr 9/14/2009 <1.0 <1.0 <1.0 <1.0 33 <0.1
4th Qtr 12/16/2009 <1.0 <1.0 <1.0 <1.0 35 <0.1
1st Qtr 2/17/2010 <1.0 <1.0 <1.0 <1.0 38 <0.1
2nd Qtr 6/14/2010 <1.0 <1.0 <1.0 <1.0 32 <0.1
3rd Qtr 8/16/2010 <1.0 <1.0 <1.0 <1.0 28 <0.1 4th Qtr 10/15/2010 <1.0 <1.0 <1.0 <1.0 24 <0.1
1st Qtr 2/23/2011 <1.0 <1.0 <1.0 <1.0 40 <0.1
2nd Qtr 5/25/2011 <1.0 <1.0 , <1.0 <1.0 31 <0.1
3rd Qtr 8/18/2011 <1.0 <1.0 <1.0 <1.0 33 <0.1
4th Qtr 11/16/2011 NA NA NA NA 32 <0.1
In 12/7/2011 <1.0 <1.0 <1.0 <1.0 NA NA
1St. Zgi" (2) 1/18/2012 <1.0 <1.0 <1.0 <1.0 21 <0.1 . 2nd Qtr 6/22/2012 <1.0 <1.0 <1.0 <1.0 32 <0.1
3rd Qtr 9/5/2012 <1.0 <1.0 <1.0 <1.0 33 <0.1
4th Qtr 10/10/2012 <1.0 <1.0 <1.0 <1.0 35 <0.1
1st Qtr 2/11/2013 <1.0 <1.0 <1.0 <1.0 34.3 <0.1
2nd Qtr 6/18/2013 <1.0 <1.0 <1.0 <1.0 34.9 <0.1
3rd Qtr 9/3/2013 <1.0 <1.0 <1.0 <1.0 33 <0.1
4th Qtr 10/29/2013 <1.0 <1.0 <1.0 <1.0 35.7 <0.1
1st Qtr 1/29/2014 <1.0 <1.0 <1.0 <1.0 34 <0.1
2nd Qtr 5/23/2014 <1.0 <1.0 <1.0 <1.0 39.7 <0.1
3rd Qtr 8/26/2014 <1.0 <1.0 <1.0 <1.0 34 <0.1
4th Qtr 10/29/2014 <1.0 <1.0 <1.0 <1.0 34.9 <0.1
1st Qtr 3/17/2015 <1.0 <1.0 <1.0 <1.0 36.3 <0.1
2nd Qtr 6/11/2015 <1.0 <1.0 <1.0 <1.0 35.8 <0.1
3rd Qtr 9/9/2015 <1.0 <1.0 <1.0 <1.0 37.7 <0.1
4th Qtr 10/28/2015 <1.0 <1.0 <1.0 <1.0 34.7 <0.1
1st Qtr 3/22/2016 <1.0 <1.0 <1.0 <1.0 36.7 <0.1
Duplicate TW4-70 <1.0 <1.0 <1.0 <1.0 37.7 0.119 2nd Qtr 6/8/2016 <1.0 <1.0 <1.0 <1.0 36.4 <0.1
Duplicate TW4-70 <1.0 <1.0 <1.0 <1.0 37.7 <0.1
3rd Qtr 8/19/2016 <1.0 <1.0 <1.0 <1.0 35.7 <0.1
4th Qtr 10/31/2016 <1.0 <1.0 <1.0 <1.0 36.9 <0.1
1st Qtr 3/21/2017 <1.0 <1.0 <1.0 <1.0 33.7 <0.1
2nd Qtr 6/21/2017 <1.0 <1.0 <1.0 <1.0 37.2 <0.1
3rd Qtr 8/8/2017 <1.0 <1.0 <1 0 . . <1.0 38.1 <0.1
4th Qtr 10/12/2017 <1.0 <1.0 <1.0 <1.0 32.6 <0.1
1st Qtr 3/15/2018 <1.0 <1.0 <1.0 <1.0 39.4 <0.1
Duplicate TW4-70 <1.0 <1.0 <1.0 <1.0 39.3 <0.1
2nd Qtr 6/14/2018 <1.0 <1.0 <1.0 <1.0 34.4 <0.1
3rd Qtr 9/22/2018 <1.0 <1.0 <1.0 <1.0 41.2 <0.1
4th Qtr 10/29/2018 <1.0 <1.0 <1.0 <1.0 32.9 <0.1
1st Qtr 3/19/2019 <1.0 <1.0 <1.0 <1.0 35.3 <0.1
2nd Qtr 6/18/2019 <1.0 <1.0 <1.0 <1.0 36.5 <0.1
3rd Qtr 9/11/2019 <1.0 <1.0 <1.0 <1.0 41.2 <0.1
4th Qtr 12/18/2019 <1.0 <1.0 <1.0 <1.0 36.3 <0.1
1st Qtr 3/18/2020 <1.0 <1.0 <1.0 <1.0 36 <0.1
Duplicate TW4-75 <1.0 <1.0 <1.0 <1.0 34.8 <0.1
2nd Qtr 6/12/2020 <1.0 <1.0 <1.0 <1.0 35.6 <0.1
3rd Qtr 9/18/2020 <1.0 <1.0 <1.0 <1.0 34.7 <0.1
4th Qtr 11/4/2020 <1.0 <1.0 <1.0 <1.0 31.3 <0.1
Dupricate TW4-65 <1.0 <1.0 <1.0 <1.0 35.9 . <0.1 ...... 1st Qtr 3/18/2020 <1.0 <1.0 <1.0 <1.0 36.8 <0.1
Duplicate TW4-75 <1.0 <1.0 <1.0 <1.0 37.4 <0.1
2nd Qtr 6/17/2021 <1.0 <1.0 <1.0 <1.0 35.8 <0.1
Duplicate TW4-75 <1.0 <1.0 <1.0 <1.0 34.3 <0.1
3rd Qtr 9/23/2021 <1.0 <1.0 <1.0 <1.0 35.3 <0.1 Duplicate TV/4-75 <1.0 <1.0 <1.0 <1.0 35.5 <0.1
(1) VOCs were resampled because laboratory missed holding time.
(2) As of March 2012 both north and south wild life ponds no longer receiving water.
NA = not analyzed
Shaded indicates concentrations exceeding GWOS.
TABLE 1 (4 of 33)
Historic Summary Of Monitoring Well Analytical Results Up To The 3rd Qarter 2021
Chloroform Contamination Investigation
DUSA White Mesa Mill
TIN4-1 (chloroform pumping well Maned in 1/14/15)
Sampling Event
Parameter
(GWQS)
Carbon Tetrachloride
(5 pg/L)
Chloroform
(70 pg/L)
Chloromethane
(30 pg/L)
Methylene Chloride
(5 pg/L)
Chloride
No GWQS (mg/L)
Nitrate, Nitrate + Nitrite
(10 mg/L)
1st Qtr 3/16/2005 NA 2,700 NA NA NA 9.1
2nd Qtr 5/25/2005 NA 3,080 NA NA NA 10.6
3rd Qtr 8/31/2005 <10 2,900 <10 <10 NA 9.8
41h Qtr 12/7/2005 <50 2,400 <50 <50 52 9.7
1st Qtr 3/9/2006 <50 , 2,700 <50 <50 49 9.4
2nd Qtr 6/14/2006 <so 2,200 <50 <50 48 9.6
3rd Qtr 7/20/2006 <50 2,840 <50 <50 51
4th Qtr 11/8/2006 1.4 2 260 <1.0 <1.0 47 9.2
lst Qtr 2/28/2007 1.2 1900. <1.0 <1.0 47 .6.6
2nd Qtr 6/27/2007 1.4 1,900 <1.0 <1.0 , 45 9
3rd Qtr 8/15/2007 1.3 2,300 <1.0 <1.0 43 8.4
4th Qtr 10/10/2007 1.3 2 000 <1.0 <1.0 43 7.8 ................. 1st Qtr 3/28/2008 1.3 2,000 <1.0 <1.0 39 7.6
2nd Qtr 6/25/2008 1.1 1,900 <1.0 1-0 39 8.68
3rd Qtr 9/10/2008 1.3 1,700 <1.0 <1.0 35 8.15
4th Qtr 10/15/2008 1.3 1,700 <1.0 <1.0 41 9.3
1st Qtr 3/11/2009 1.1 1,700 <1.0, <1.0 37 7.5
2nd Qtr 6/23/2009 1 1,500 <1.0 <1.0 37 6.9
3rd Qtr 9/14/2009 <1.0 1,700 <1.0 <1.0 36 7.3
4th Qtr 12/29/2009 <1.0 1 400 <1.0 <1.0 41 6 8
1st Qtr 3/3/2010 <1.0 1,300 <1.0 <1.0 35 7.1
2nd Qtr 6/14/2010 1.2 1,600 <1.0 <1,0 40 6.8
3rd Qtr 8/18/2010 1 1,600 <1.6 <1.6 35 6.7
4th Qtr 10/15/2010 <1.0 1 500 <1.0 <1.0 40 6.6
1st Otr 2/24/2011 <1.0 1,60 <1.0 <1.0 41 6.6
2nd Qtr 6/1/2011 <1.0 1,200 <1.0 <1.0 35 6.6
3rd Qtr 8/18/2011 <1.0 1,300 <1.0 <1,0 36 6.8
4th Qtr 11/29/2011 <1.0 _ 1 SOO <1.0 <1.0 40 6.6 fifOtR21 1/24/2012 <1.0 1,300 <1.0 <1.0 ,- 38 . -2nd Qtr 6/14/2012 <1.0 1,000 <1.0 <1.0 42 7.1
3rd Qtr 9/28/2012 <1.0 1,000 <1.0 <1.0 39 5.0
4th Qtr 10/4/2012 <1.0 1,100 <1.0 <1.0 40 6.5
1st Qtr 2J13/2013 . 3.66 1,320 <1.0 <1.0 37.6 6.99
2nd Qtr 6/19/2013 <1.0 1,100. <1.0 <1.0 39.1 6.87
3rd Qtr 9/3/2013 <1.0 1,150 <1.0 <1.0 37.6 7.12
4th Qtr 11/14/2013 <1.0 1 280 <1.0 <1.0 36.5 7.08
1st Qtr 2/5/2014 5.47 1,690 <1.0 <1.0 . .38.9 7.74
2nd Qtr 5/23/2014 4.77 1,020 <1.0 <1.0 37.4 ...„.. 6.93
3rd Qtr 8/27/2014 <1.0 845 1.4 <1.0 38 4.80
4th Qtr 16/29/2014 <1.0 1,140 <1.0 <1.0 _ 38.7 6.31 -1 st Qtr (2) 3/9/2015 <1.0 1,130 <1.0 <1.0 38.3. 7.06
2nd Qtr 6/8/2015 <1.0 1,260 <1.0 <1.0 40.3 6.07
3rd Qtr 8/31/2015 <1.0 1,060 <1.0 , <1.0 45.9 6.28
4th Qtr 10/19/2015 <1.0 1,040 <1.0 <1.0 38.5 1.55
1st Qtr 3/9/2016 <1.0 974 <1.0 <1.0 41.7 0.148
2nd Qtr 5/23/2016 <1.0 1,140 <1.0 <1.0 44.4 0.138
3r8 Qtr 7/25/2016 <1.0 1,160 <1.0 <1.0 44.7 5.49
4th Qtr 10/13/2016 <1.0 ,.1,,330 <1.0 <1.0 44 2 .0..7.46 lst Qtr 3/8/2017 <1.0 6.19 <1.0 <1.0 4:1:5 .4.44
2nd Qtr 6/13/2017 <1.0 977 <1.0 <1.0 41.8 5.74
3rd Qtr 7/26/2017 <1.0 958 <1.0 <1.0 42.8 5.04
4th Qtr 10/11/2017 <1.0 556 <1.0 <1.0 38.5 5.78
DIA/MRC split.s.mple <7.6 810 <12 23 J 42 0.17 Tiftff(3T 3./12726f 8 <1 .0 70.4 <1.0 <1.0 ,- 45.8 4.84
2nd Qtr 6/8/2018 <1.0 942 <1.0 <1.0 42.0 4.36
3rd dtr 8/22/2018 <1.0 1,010 <1.0 <1.0 47.3 4.30
4th Qtr 10/22/2018 <1.0 752 <1.0 <1.0 43.2 4.57
DWMRC spht sample.
lst Qtr 3/8/2019
<5.0
<1.0
210
87.2
<5.0 <1.0
<5.0
<1.0
NA
40.9 ....9.A6., 4.51
2nd Qtr 6/5/2019 <1.0 1,040 <1.0 <1.0 44.8 1.43
3rd Qtr 9/4/2019 <1.0 894 <1.0 <1.0 46 1.65
4th Qtr 12/10/2019 <1 0 _ 1,070 <1.0 <1.0 44.2 3.91
1st Qtr 2/19/2020 <1.0 1,190 <1.0 <1.0 47.5 4.67
2nd Qtr 5/27/2020 <1.0 499 <1.0 <1.0 46.4 0.44
3rd Qtr 9/4/2020 <1.0 1,060 <1.0 <1.0 43.7 2.22
4th Qtr 10/28/2020 <1.0 924 <1.0 <1.0 .......419 4.30 ............ 1st Qtr 2/23/2021 <1.0 948 <1.0 <1.0 45.4 2.72
2nd Qtr 6/9/2021 <1.0 957 <1.0 „ „ <1.0 , 37.2 0.73
3rd Qtr 8/24/2021 <1.0 821 1.18 <1.0 44.8 1.38
(1) As of March 2012 both north and south wild life ponds no Mnger receiving water.
2TW4-1 concerted to a chloroform Eirainuvell started in 1/14/15
(3) chloroform purnping well TW4-41 started in May 2018.
NA = not analyzed
Shaded indicates concentrations exceeding GWQS. Bold and italics indicates the MDL exceeded the GWQS.
J = Approximated value
TABLE 1 (5 of 33)
Historic Summary Of Monitoring Well Analytical Results Up To The 3rd Qarter 2021
Chloroform Contamination Investigation
DUSA White Mesa Mill
T1N4-2 (chloroform purnpmg well
starting 1/14/15)
Sampling Event
Parameter
(GWQS) Carbon Tetrachloride
(5 pg/L)
Chloroform
(70 pg/L)
Chloromethane
(30 pg/L)
Methylene Chloride
(5 pg/L)
Chloride
No GWQS (mg/L)
Nitrate, Nitrate + Nitrite
(10 mg/L) 1st Qtr 3/16/2005 2nd Qtr 5/25/2005
3rd Qtr 8/31/2005
4th Qtr 12/7/2005
1st Qtr 3/9/2006
2nd Qtr 6/14/2006 3rd Qtr 7/20/2006
4th Qtr 11/8/2006 1st Qtr 2/28/2007
2nd Qtr 6/27/2007
3rd Qtr 8/15/2007
4...tb...cW... 10/10/2007
1st Qtr 3/28/2008 2nd Qtr 6/25/2008
3rd Qtr 9/10/2008 4th Qtr 10/15/2008
11/18/2008
1st Qtr 3/11/2009
2nd Qtr 6/23/2009
3rd Qtr 9/14/2009
4th Qtr 12/29/2009
1st Qtr 3/3/2010
2nd Qtr 6/14/2010 3rd Qtr 8/18/2010
4th Qtr 10/15/2010
1st Qtr 2/24/2011
2nd Qtr 6/2/2011
3rd Qtr 8/17/2011
4th Qtr 11/29/2011
Tif UfFPI 1/24/2012
2nd Qtr 6/14/2012
3rd Qtr 9/4/2012 4th Qtr 10/4/2012
1st Qtr 2/13/2013
2nd Qtr 6/19/2013
3rd Qtr 9/3/2013
4th Qtr 11/14/2013 1st Qtr 2/6/2014
2nd Qtr 5/23/2014
3rd Qtr 8/27/2014
4th Qtr 10/30/2014
1st Qtr (2) 3/9/2015
2nd Qtr 6/8/2015
3rd Qtr 8/31/2015
4th Qtr 10/19/2015
1st Qtr 3/9/2016 2nd Qtr 5/23/2016 3rd Qtr 7/25/2016
4th Qtr 10/12/2016
ist Qtr 3/8/2017
2nd Qtr 6/13/2017
3rd Qtr 7/26/2017 4th Qtr 10/11/2017
DWMIRC split sample
DWMRC duplicate TW4-50 l st Qtr 3/12/2018
2nd Qtr 6/8/2018
3rd Qtr 8/22/2018 4th Qtr 10/22/2018
1st Qtr 3/8/2019
2nd Qtr 6/5/2019
3rd Qtr 9/4/2019
4th Qtr 12/10/2019
1st Qtr 2/19/2020
2nd Qtr 6/10/2020 3rd Qtr 9/4/2020
4th Qtr 10/28/2020
1st Qtr 2/23/2021
2nd Qtr 6/9/2021
3rd Qtr 8/24/2021
NA NA
<10
<50
<50
<50
<50
NA
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0 <1.0
<19
<19
<1.0
<1.0
<1.0 <1.0
<1.0
<1.0
<1.0
<1.0 <1.0
<1.0 <1.0
<1.0
<1.0
<1.0
<1.0
2.3 1.8
2.5
2.2
2.1
2.3 2.2
2.4
2.4
2.2
2
2
2
2
2.6 2.5
2.1
2.4
2.2
1.6
2.8
2
2.1
1.8 2
5.17
2.65
2.41
3.15
7.1
6.05
1.4
2.6
1.44
1.2 1.49
2.6
#N/A
3,700 3,750
3,900
3,500
3,800
3,200
4,120
3 420 2,500
3,000
340
3,200
3,300 3,100
2,800
3 200
3,100
2,800
3,000
1 600
2,600
3,300 3,300
3 000
5,100
3,000
2,400
.3.,900
.2,500
2,500
2,900 3 100
3,580
3,110
3,480
3,740 3,180
2,930
3,170
3,580
1,840
1,650
1,060
2 070
1,970 2,070 1,780
1 600
.1,570
1,940
1,310 1,610
1,200 "pc)
764
949
980 822
1,040 1,360
797
934 1,880
1,070
1,260
1 130
939
1,160
1,150
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
2
<1.0
<1.0 <1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0 <1.0
<1.0
<1.0
<1.0
<1.0
<1.0 <1.0 <30
<30
<1.0
<1.0
<1.0 <1.0
<1.0
<1.0
<1.0
<1.0 <1.0
<1.0 <1.0
<1.0
<1.0
<1.0
<1.0
3.6
2.6
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
68 J
60 J
NA
NA
NA
56
56
56
54
55 54
50
49
51 48 46
42
47
NA
46 44
43
46
42
43 43
41
46
42
48 49
49
52
76 49
46
46.9
44.9
43.9 45.9
45.4
45
45.5
44.9
48.1
50
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
42.1
40.6 41.3
38.7
-45.5
32.5
36.8
41.9
41.5
#N/A
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
6.5 6.4
6.6
6.4 ........ 5.8
8.7 6.6
6.5 ........... 7.0
6.8
6.0
7.9. .......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
217.4
4.90
5.08 3.25 4.00
5. op
...:.64
3.50
4.83 3.52 ......... 5.9
4.38
4.79
3.40
6.07
3.62 3.35
2.34 ......... 5.30
3.89
1.97
(1) As of March 2012 both north and south wtld life ponds no longer receiving water.
(2) TW4-2 and TW4-11 converted to a chloroform purnping well started M 1/14/15
NA and #NIA(for graph use)= not analyzed
Shaded indicates concentrations exceeding GWQS.
Bold and italics indicates the MDL exceeded the GWQS.
J = Approximated value
TABLE 1 (6 of 33)
Historic Summary Of Monitoring Well Analytical Results Up To The 3rd Qarter 2021
Chloroform Contamination Investigation
DUSA White Mesa Mill
TW4-3
Samphng Event
Parameter
(GWQS)
Carbon Tetrachloride
(5 pg/L)
Chloroform
(70 pg/L)
Chloromethane
(30 pg/L)
Methylene Chloride
(5 pg/L)
Chloride
No GWQS (mg/L)
Nitrate, Nitrate + Nitrite
(10 mg/L)
1st Qtr 3/16/2005 NA <1 0 NA NA NA 3 5
2nd Qtr 5/25/2005 NA <1 0 NA NA NA 3 7
3rd Qtr 8/31/2005 <1.0 <1 0 6 4 <1 0 NA 3 5
4th Qtr 12/7/2005 <1 0 <1 0 <1 0 <1 0 . 26. 3 3
1st Qtr 3/9/2006 <1 0 <1 0 2 3 <1 0 26 3 3
2nd Qtr 6/14/2006 <1 0 <1 0 1 6 <1 0 26 7 1
3rd Qtr 7/20/2006 <1 0 <1 0 2 2 <1 0 26 2 9
4th Qtr . , fsi cir - 11/8/2006
2/2-8/2007
<1 0
<1 0
<1 0
<1 0
<1 <1 0 0 <1 0 <1 0 23.
22
.. 1 5
a 1
2nd Qtr 6/27/2007 <1 0 <1 0 <1 0 <1 0 23 3 3
3rd Qtr 8/15/2007 <1 0 <1 0 <1 0 <1 0 24 3 1
4th Qtr • 10/10/2007 <1 0 •• <1 0 <1 0 <1 0 27 .. 2.8
1st Qtr 3/26/2008 <1 0 <1 0 <1 0 <1 0 21 26
2nd Qtr 6/25/2008 <1 0 <1 0 <1 0 <1 0 19 2 9
3rd Qtr 9/10/2008 <1 0 <1 0 <1 0 <1 0 19 2 7
4th Qtr 10/15/2008 <1 0 <1 0 <1 0 <1 0 22. 2 6
1st Qtr 3/4/2009 <1 0 <1 0 <1 0 <1 0 21 se 2
2nd Qtr 6/23/2009 <1 0 <1 0 <1 0 <1 0 20 2 9
3rd Qtr 9/14/2009 <1 0 <1 0 <1 0 <1 0 21 2 8
4th Qtr 12/29/2009 <1.0 <1 0 <1 0 <1 0 22, 2 6
1st Qtr 2/23/2010 <1 0 <1 0 <1 0 <1 0 23 2 6
2nd Qtr 6/14/2010 <1 0 <1 0 <1 0 <1 0 24 3 0
3rd Qtr 8/10/2010 <1 0 <1 0 <1 0 <1 0 22 3 1
4th Qtr 1st Oa
10/15/2010
2/15/2011
<1 0
<1 0 _... <1 0
<1 0
<1
<1
0
0
<1 0 • <1 0
26. 23 3 3 3 6
2nd Qtr 5/25/2011 <1 0 <1 0 <1 0 <1 0 23 3 7
3rd Qtr 8/17/2011 <1 0 <1 0 <1 0 <1 0 23 4 0
4th Qtr 11/14/2011 <1 0 <1 0 <1 0 <1 0 23. 4 4 fit Oil- (2) 1/17/2012 <1 0 — <1 0 <1 0 <1 0 4- 21 7 1
2nd Qtr 5/31/2012 <1 0 <1 0 <1 0 .-<1 0 24'- 44
3rd Qtr 8/28/2012 <1 0 <1 0 <1 0 <1 0 25 4 9
4th Qtr 10/3/2012 <1 0 . <1 0 . <1 0 0 ..<1 25 4 8
1st Qtr 2/7/2013 <1 0 <1 0 <1 0 <1 0 23 7 5 05
2nd Qtr 6/28/2013 <1 0 <1 0 <1 0 <1 0 23 8 5 83
3rd Qtr 9/3/2013 <1 0 <1 0 <1 0 <1 0 25 4 90
4th Qtr_ 11/8/2013 <1 0 <1 0 <1 0 <1.0 24 1 5 89
1st Qtr 1/22/2014 <1 0 <1 0 <1 0 <1 0 24 9 6 66
2nd Qtr 5/21/2014 <1 0 <1 0 <1 0 <1 0 24 4 6 01
3rd Qtr 8/13/2014 <1 0 <1 0 <1 0 <1 0 26 5 30
4th Qtr _ , lit Qir
10/23/2014 3/11/2015 <1 0 <1 0
<1 0
<1 0
<1
<1
0
0
<1 0
<1 0
26 7.
26 2
6 07
6 64
2nd Qtr 6/10/2015 <1 0 <1 0 <1 0 <1 0 27 5 5 71
Duplicate TW4-65 <1 0 <1 0 <1 0 <1 0 27 5 3 94
3rd Otr 8/13/2015 <1 0 <1 0 <1 0 <1 0 27 4 3 88
4th Qtr 10/21/2015 <1 0 <1.0 <1 0 <1 0 25 6 5 37
1st Qtr 3/15/2016 <1 0 <1 0 <1 0 <1 0 32 8 5 83
2nd Qtr 5/25/2016 <1 0 <1 0 <1 0 <1 0 27 9 5 65
3rd Qtr 7/27/2016 <1 0 <1 0 <1 0 <1 0 26 5 6 10
4th Qtr 10/19/2016 <1 0 _ <1 0 ,<1 0 <1 0 29 5, 6 00
1st Qtr 3/1 4/261 i <1 0 <1 0 <1 0 <1 0 28 1 6 -16
2nd Qtr 6/14/2017 <1 0 <1 0 <1 0 <1 0 28 7 6 36
3rd Qtr 7/27/2017 <1 0 <1 0 <1 0 <1 0 28 5 6 36
Duphcate TW4-65 <1 0 <1 0 <1 0 <1 0 28 9 6 24
4th Qtr . 10/11/2017 <1 0 <1 0 <1 0 <1 0 25 9 6 32.
lit Qtr 3/14/2018 <1 0 <1 0 <1 0 <1 0 29 6. 6 46
Duphcate TW4-65 <1 0 <1 0 <1 0 <1 0 29 5 6 31
2nd Qtr 6/8/2018 <1 0 <1 0 <1 0 <1 0 26 1 6 52
3rd Qtr 8/29/2018 <1 0 <1 0 <1 0 <1 0 31 0 5 53
Duplicate TW4-65 <1 0 <1 0 <1 0 <1 0 31 0 5 44
4th Qtr 11/30/2018 <1 0 <1 0 <1 0 <1 0 27 4 5 85
Duplicate TW4-65 <1 0 • <1 0 • <1 0 <1 0 26 2. 5 77
1st Qtr 3/13/2019 <1 0 <1 0 <1 0 <1 0 25 5 5 8.
2nd Qtr 6/13/2019 <1 0 <1 0 <1 0 <1 0 27 4 6 68
Duplicate TW4-65 <1 0 <1 0 <1 0 <1 0 25 9 6 60
3rd Qtr 9/11/2019 <1 0 <1 0 <1 0 <1 0 26 0 5 12
Duplicate TW4-65 <1 0 <1 0 <1 0 <1 0 22 1 5 76
4th Qtr . 12/12/2019 <1 0 <1 0, <1 0 <1 0 28 5 91
1st Qtr 3/1 7/2020 <1 0 <1 0 <1 0 <1 0 27 7 615
Duplicate TW4-65 <1 0 <1 0 <1 0 <1 0 26 6 38
2nd Qtr 6/10/2020 <1 0 <1 0 <1 0 <1 0 26 2 6 53
Duplicate TW4-65 <1 0 <1 0 <1 0 <1 0 26 7 6 63
3rd Qtr 9/17/2020 <1 0 <1 0 <1 0 <1 0 25 9 6 36
4th Qtr 11/4/2020 <1 0 <1 0 <1 0 <1 0 24 9, 6 02
1st Qtr 3/17/2621 <1 0 <1 0 <1 0 <15 28 4 6 19
Duplicate TW4-65 <1 0 <1 0 <1 0 <1 0 27 6 6 64
2nd Qtr 6/15/2021 <1 0 <1 0 <1 0 <1 0 27 8.04
Duplicate TW4-65 <1 0 <1 0 <1 0 <1 0 23 9 7 89
3rd Qtr 9/15/2021 <1 0 <1 0 <1 0 <1 0 20 3 5 28
Duplicate TW4-65 <1 0 <1 0 <1 0 <1 0 20 7 6 19
NA = not analyzed Shaded indicates concentrations exceeding GWQS
TABLE 1 (7 of 33)
Historic Summary Of Monitoring Well Analytical Results Up To The 3rd Qarter 2021
Chloroform Contamination Investigation
DUSA White Mesa Mill
TIN4-4 (chloroform pimping well stared in rat qtr 2010)
Sampling Event
Parameter
(GWQS)
Carbon Tetrachloride
(5 pg/L)
Chloroform
(70 pg/L)
Chloromethane
(30 pg/L)
Methylene Chloride
(5 pg/L)
Chloride
No GWQS (mg/L)
Nitrate, Nitrate + Nitrite
(10 mg/L)
1st Qtr 3/16/2005 NA 3,100 NA NA NA 10.0
2nd Qtr 5/25/2005 NA 2,400 NA NA NA 11.3
3rd Qtr 8/31/2005 <10 3200, <10 <10 NA 9.9
4th Qtr 12/7/2005 <50 2,800 <50 <50 54 10.2
1st Qtr 3/9/2006 <50, , 2,900 <50 <50 51 9.5
2nd Qtr 6/14/2006 <50 2,600 <50 <50 48 8.6
3rd Qtr 7/20/2006 <50 2,850 <50 <50 50 9.7
4th Qtr 11/8/2006 1.7 2,670 <1.0 <1.0 49 10.1
1st Qtr 2/28/2007 1.5 2,200 <1.0 <1.0 49 9.0
2nd Qtr 6/27/2007 1.7 2,400 <1.0 <1.0 47 9.4
3rd Qtr 8/15/2007 1.5 2 700 ., <1.6 <to 45 . „„... 9.5
4th Qtr 10/10/2007 1.5 2,„.500 <1.0 <1.0 47 9.5
1st Qtr 3/28/2008 1.6 2,600 <1.0 <1.0 43 9.2
2nd Qtr 6/25/2008 1.5 2,500 <1.0 <1.0 42 10.8
3rd Qtr 9/10/2008 1.4 2200, <1.0 <1.0 39 8.8
4th Qtr
lst Qtr
10/15/2008 11/18/2008 NA <2.0 #N/A 2 500
NA
<2.0
NA , <2.0
44
NA #N/A
16.1
1st Qtr , 3/4/2009 1.2 2200 <1.0 <1.0 37 10.2
2nd Qtr 6/23/2009 1.2 1,800 <1.0 <1.0 34 .. .. 8.2
3rd Qtr 9/14/2009 1.1 2,000 <1.0 <1.0 39 8.4
4th Otr 12/29/2009 1.1 950 <1.0 <1.0 41 7.6
1st Qtr (2) 2/17/2010 1 1,700 <1.0 <1.0 48 6.6
2ncl,Qtr 6/14/2010 1.2 1,700 <1.0 <1.0 35 7.6
3rd Qtr 8/10/2010 1,3 , 2,100 <1.0 <1.0 36 7.3
4th Qtr 10/15/2010 1.3 1 700 <1.0 <1.0 38 7.1
1st Qtr 2/23/2011 1.4 1,800 <1.0 <1.0 41 7.0
2nd Qtr 6/1/2011 1.2 1,700 <1.0 <1.0 35 7.0
3rd Otr 8/17/2011 <1.0 1,500 <1.0 <1.0 40 6.6
4th Qtr 11/16/2011 1,500 <1.0 <1.0 39 7.0
1 ifafr Cli 1/23/2012 <1.0 1,200 <1.0 <1.0 ‘,.. 38.- 7.1 .
2nd Qtr 6/6/2012 <1.0 1,500 <1.0 <1.0 , 43 7.1
3rd Qtr 9/4/2012 1.2 . .. 1,600 <1.0 <1.6 39 7.1
4th Qtr 10/3/2012 1 _1,100 <1.0 <1.0 38 7.0
1st Otr , , 2/11/2013 • 1 , 1,460 <1.0 <1.0 39 7.36
2nd Qtr 6/29/2013 <1.0 1,330 <1.0 <1.0 39.6 6.30
3rd Qtr, , 9/3/2613 1.2 . . 1,380 <1.0 <1.0 38.8 7.22
4th Qtr 10/23/2013 5.3 1 360 <1.0 <1.0 43.9 7.84
1st Qtr 1/2712014, 3.88 1,260 <1.0 <1.0 37.4 7.28
2nd Qtr 5/19/2014 4.94 1,220 <1.0 <1.0 47.5 5.91
3rd Qtr 8/11/2014 4.94 1,320 7.1 <1.0 40 5.3
4th Qtr 10/21/2014 <1 0 1 130 <1.0 <1.0 40 7.02
1st Qtr (4) 3/9/2015 1.05 1,350 <1.0 (- <1.0 _ 37.6r 7.7
2nd Qtr 6/10/2015 <1.0 1,280 <1.0 <1.0 41.3 6.33
3rd Qtr 8/31/2015 <1.0 1,220 1.72 <1.0 45.8 6.45
4th Qtr 10/19/2015 <1.0 L:190 <1 0 <1.0 38.5 6.27
1st Qtr 3/9/2016 <1.0 1,190 <1.0 <1.0 39.7 ..... . 6.7
2nd Qtr 5/23/2016 1.21 1,780 <1.0 <1.0 41.9 6.56
3rd Qt(r 7/27/2016 <1.0 1,380 <1.0 <1.0 40.2 7.22
41h Qtr 10/13/2016 <1.0 1 430 <1.0 <1.0 40.3 6.77 ........._
1st Qtr 3/8/2017 <1.0 . 1,290 <1.0 <1.0 41.7 . . . „ . 6.87
2nd Qtr 6/13/2017 <1.0 1,290 <1.0 <1.0 40.7 7.06
3rd Qtr 7/26/2017 <1.0 1,290 <1.0 <1.0 40.5 6.47
4th Qtr 10/11/2017 <1.0 1,120 <1.0 <1.0 40.7 6.90
1st Qtr 3/12/2018 <1.0 --1,160 <1.0 <1.0 42.2 6.12
2nd Qtr (3) 6/8/2018 <1.0 1,050 <1.0 <1.0 39.0 6.34
3rd Qtr 8/22/2018 <1.0 1,030 <1.0 <1.0 44.6 6.10
4th Qtr 11/28/2018 <1.0 1,140 <1.0 <1.0 41.4 6.02
1st Qtr 3/8/2019 <1.0 1,050 <1.0 <1.0 38.3 7.26
2nd Qtr 6/5/2019 <1.0 1,070 <1.0 <1.0 38.5 10.40
3rd Qtr 9/4/2019 <1.0 989 .. . <1.0 <1.0 39.4 6.32
4th Qtr 12/10/2019 <1.0 1 140 ...A <1.0 <1.0 40.4 6.52
1st Qtr 2/19/2020 <1.0 1,100 <1.0 <1.0 43.4 4.58
2nd Qtr 5/27/2020 <1.0 1,140 <1.0 <1.0 46.1 7.26
3rd Qtr 9/4/2020 <1.0 1,110 <1.0 <1.0 40.0 7.04
4th Qtr 10/28/2020 <1.0 979 <1.0 <1.0 38.6 6.77
1st Qtr 2/23/2021 <1.0 1,130 <1.0 <1.0 39.8 6.75
2nd Qtr 6/9/2021 <1.0, 1,240 <1.0 <1.0 39.4 9.02
3rd Qtr 8/24/2021 <1.0 1,100 <1.0 <1.0 39.6 4.01:1
(1) As of March 2012 both north and south wild life ponds no longer receiving water
(2) TW4-4 converted to a Chloroform zumpinvell stared in 15 qtr 2010
(3) TW4-41 installed as a Chloroform 'Duman-iv/ell stared in May 2018
'4) TW4-2 convertett., tr a cPtoroform paaping_well started in 1/14/15
NA and #N/A(for graph use) not analyzed Shaded indicates concentrations exceeding GWQS.
Bold and italics indicates the MDL exceeded the GWQS.
TABLE 1 (8 of 33)
Historic Summary Of Monitoring Well Analytical Results Up To The 3rd Qarter 2021
Chloroform Contamination Investigation
DUSA White Mesa Mill
TW4-5
Sampling Event
Parameter
(GWQS)
Carbon Tetrachloride
(5 pg/L)
Chloroform
(70 pg/L)
Chloromethane
(30 pg/L)
Methylene Chloride
(5 pg/L)
Chloride
No GWQS (mg/L)
Nitrate, Nitrate + Nitrite
(10 mg/L)
1st Qtr 3/16/2005 NA 120 NA NA NA 4.9
2nd Qtr 5/25/2005 NA 113 NA NA NA 3.7
3rd Qtr 8/31/2005 <2.5 82 5.8 <2.5 NA 6.0
4th Qtr 12/7/2005 <2.5 63 2.5 <2.5 56 6.0 ..................... 1st Qtr 3/9/2006 <2.5 66 3.1 <2.5 52 .6.0
2nd Qtr 6/14/2006 <2.5 51 3.1 <2.5 51 5.9
3rd Qtr 7/20/2006 <1.0 53.7 <1.0 <1.0 54 6.7
4th Qtr 11/8/2006 <1.0 47.1 <1.0 <1.0 55 2.9
1st Qtr 2/28/2007 <1.0 35 <1.0 <1.0 57 7.8
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
1st Qtr 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 3/4/2009 <1.0 12 <1.0 <1.0 34 7.9
2nd Qtr 6/23/2009 <1.0 13 <1.0 <1.0 37 7.5
3rd Qtr 9/14/2009 <1.0 12 <1.0 <1.0 48 8.3
41h Qtr 12/29/2009 <1.0 8.5 <1.0 <1.0 41 7.5
1st Qtr 2/25/2010 <1.0 13 <1.0 <1.0 43 6.8
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
1st Qtr 2/22/2011 <1.0 10 <1.0 <1.0 34 7.0
2nd Qtr 5/26/2011 <1.0 9 <1.0 <1 o 35 7.2
3rd Qtr 8/7/2011 <1.0 10 <1.0 <1.0 37 7.5
4th Qtr 11/16/2011 NA #N/A NA NA 30 6.0
(1) 12/7/2011 <1.0 7.9 <1.0 <1 o NA #N/A
'fit Citr(2)- 1/18/2012 ....._ ___ <1.0 7.6 <1.0 . _ <1 0 . _ 22 5.8
-2nd Qtr 6/6/2012 <1.0 8.4 <1.0 <1.0 39 - 8.6
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
1st Qtr 2/13/2013 <1.0 10.8 <1.0 <1.0 34.3 8.24
2nd Qtr 6/13/2013 <1.0 11.2 <1.0 <1.0 36.5 10.70
3rd Qtr 9/5/2013 <1.0 11.6 <1.0 <1.0 39.1 7.79
4th Qtr 11/13/2013 <1.0 14.4 <1.0 <1.0 41.1 7.75
1st Qtr 1/30/2014 <1.0 12.5 <1.0 <1.0 40.5 9.16
2nd Qtr 5/22/2014 <1.0 13.4 <1.0 <1.0 51.4 7.78
3rd Qtr 8/14/2014 <1.0 12.0 <1.0 <1.0 44 7.2
4th Qtr 10/13/2014 <1.0 14.6 <1.0 <1.0 45.1 8.31
1st Qtr 3/12/2015 <1.0 13.8 <1.0 <1.0 45.1 9.32
Duplicate TW4-70 <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
4th Qtr 10/28/2015 <1.0 11.0 <1.0 <1.0 43.6 8.03
1st Qtr 3/17/2016 <1.0 11.0 <1.0 • <1.0 44.7 10.2
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
Duplicate TW4-75 <1.0 12.0 <1.0 <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 6/15/2017 <1.0 14.6 <1.0 <1.0 47.3 8.52
3rd Qtr 8/8/2017 <1.0 14.6 <1.0 <1.0 48.6 8.52
4th Qtr 10/11/2017 <1.0 13.8 <1.0 <1.0 42.5 8.57
DWMRC split sample <0.19 12 <0.3 <0.32 47
1st Qtr 3/12/2018 <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
Duplicate TW4-70 <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
Replicate TW4-70 <1.0 16.2 <1.0 <1.0 48.5 .................. T80 .............
ist Qtr 3/16/2019 <1.0 14.1 <1.0 <1.0 47.6 7.38
2nd Qtr 6/13/2019 <1.0 15.8 <1.0 <1.0 49.3 7.62
3rd Qtr 9/11/2019 <1.0 14.6 <1.0 <1.0 46.1 7.04
Duplicate 11N4-70 <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
Deptleate TW4-70 <1.0 <1.0 <1.0 52.5 7.29
1st dir 3/17/2020 <1.0 14.8 <1.0 <1.0 48.3 7.10
Duplicate T1A/4-70 <1.0 14.8 <1.0 <1.0 48.4 7.72
2nd Qtr 6/11/2020 <1.0 15.4 <1.0 <1.0 49.5 7.83
3rd Qtr 9/18/2020 <1.0 14.8 <1.0 <1.0 47.0 6.37
4th Qtr 11/4/2020 <1.0 15.6 <1.0 <1.0 50.2 6.19
1st Qtr 3/18/2021 <1.0 12.9 <1.0 <1.0 46 7.43
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) VOCe were resampled because laboratory missed holding time. (2) As of March 2012 both north and south wild life ponds no longer receiving water. c1.2lorofonh2thaniwell TVV4-39 started in 11/20/16
NA and #NIA(for graphs) = not analyzed Shaded indicates concentrations exceeding GWQS.
TABLE 1 (9 of 33)
Historic Summary Of Monitoring Well Analytical Results Up To The 3rd Qarter 2021
Chloroform Contamination Investigation
DUSA White Mesa Mill
TW4-6
Sampling Event
Parameter
(GWQS) Carbon Tetrachloride
(5 pg/L)
Chloroform
(70 pg/L)
Chloromethane
(30 pg/L)
Methylene Chloride
(5 pg/L)
Chloride
No GWQS (mg/L)
Nitrate, Nitrate + Nitrite
(10 mg/L)
1st Qtr 3/16/2005 NA <1.0 NA NA NA 0.2
2nd Qtr 5/25/2005 NA 2.5 NA NA NA 0.4
3rd Qtr 8/31/2005 <1.0 10 2.8 <1.0 NA 0.8
4th Qtr 12/7/2005 <1.0 17 1 3 <1.0 32 0.9 1st Qtr 3/9/2006 <1.0 31 <1.0 <1.0 31 1.2
2nd Qtr 6/14/2006 <1.0 19 <1.0 <1.0 30 1.0
3rd Qtr 7/20/2006 <1.0 11 <1.0 <1.0 37 0.6
4th Qtr 11/8/2006 <1.0 42.8 <1.0 <1.0 65 ........... 1.4
1st Qtr 2/28/2007 <1.0 46 <1.0 <1.0 32 1.6 2nd Qtr 6/27/2007 <1.0 11 <1.0 <1.0 38 0.6
3rd Qtr 8/15/2007 <1.0 18 <1.0 <1.0 36 0.7
4th Qtr 10/10/2007 <1.0 18 <1.0 <1.0 35 0.8
1st Qtr 3/28/2008 <1.0 52 <1.0 <1.0 33 1.1
2nd Qtr 6/25/2008 <1.0 24 <1.0 <1.0 35 0.9 3rd Qtr 9/10/2008 <1.0 39 <1.0 <1.0 35 1.1
4th Qtr ..........,............ 10/15/2008 ...........................„,.....,....„............... <1.0 37 <1.0 <1.0 33 1.0
1 st oir 3/4/2009. <1.0 81 <1.0 <1.0 35 2.2
2nd Qtr 6/23/2009 <1.0 120 <1.0 <1.0 37 2.7
3rd Qtr 9/14/2009 <1.0 280 <1.0 <1.0 37 5.0 4th Qtr 12/29/2009 <1.0 250 <1 0 <1.0 41 6 1
1 st Qtr (5) 2/25/2010 <1.0 1000 <1.0 <1.0 45 1.8"
2nd Qtr 6/14/2010 <1.0 590 <1.0 <1.0 33 2.5
3rd Qtr 8/11/2010 <1.0 630 <1.0 <1.0 31 3.9
4th Qtr 10/15/2010 <1.0 420 <1.0 <1.0 41 4.3 ............... ist Qtr 2/22/2011 <1.0 <1.0 <1.0 40 0.7 47
2nd Qtr 5/26/2011 <1.0 9.6 <1.0 <1.0 42 0.3
3rd Qtr 8/7/2011 <1.0 16 <1.0 <1.0 39 0.3 4th Qtr 11/16/2011 NA #N/A NA NA 36 0.8
(1) 12/7/2011 <1.0 21 <1.0 <1.0 NA #N/A
(2) 11/16/2011 <1.0 50 <1.0 <1.0 33 0.8 1ifair (4) 1/18/20'12 <1.0 38 <1.0 <1.0 ,- •38 ,- 0.7 -2nd Qtr 6/6/2012 <1.0 4.7 <1.0 <1.0 40 0.2
3rd Qtr 9/11/2012 <1.0 6.9 <1.0 <1.0 21 0.1
4th Qtr 10/4/2012 <1.0 9 <1.0 <1.0 41 0.2 .......... 1st Qtr 2/13/2013 <1.0 6.89 <1.0 <1.0 40.4 0.2
2nd Qtr 6/13/2013 <1.0 4.86 <1.0 <1.0 37.9 0.2
3rd Qtr 9/5/2013 <1.0 5.93 <1.0 <1.0 40.6 0.2
4th Qtr 11/13/2013 <1.0 5.51 <1.0 <1.0 40.2 1.5
1st Qtr 1/29/2014 <1.0 5.7 <1.0 <1.0 40.6 -0-.2
2nd Qtr 5/22/2014 <1.0 10.3 <1.0 <1.0 37 0.3
3rd Qtr 8/14/2014 <1.0 202 <1.0 <1.0 40 4.2
(3) 9/24/2014 <1.0 260 <1.0 <1.0 NA #N/A
4th Qtr 10/29/2014 <1.0 723 <1.0 <1.0 41.1 6.9
1st Qtr 3/12/2015 <1.0 1,180 <1.0 <1.0 41.2 5.3
2nd Qtr 6/10/2015 <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
4,tp,Qtr_. 10/29/2015 <1.0 843 <1.0 <1.0 40.2 5.6 ist air 3/22/2016 <1.0 834 <1.0 <1.0 42.3 6.79
2nd Qtr 6/8/2016 <1.0 486 <1.0 <1.0 44.1 3.19
3rd Qtr 7/27/2016 <1.0 433 <1.0 <1.0 42.2 3.85
4th Qtr 10/26/2016 <1.0 301 <1.0 <1.0 46.1 3.74
1st Qtr 3/16/2017 <1.0 288 <1.0 <1.0 42.1 3.15
2nd Qtr 6/21/2017 <1.0 239 <1.0 <1.0 42.6 2.42 3rd Qtr 8/8/2017 <1.0 129 <1.0 <1.0 42.9 1.71
4th Qtr 10/11/2017 <1.0 121 <1.0 <1.0 37.6 1.71
1st Qtr 3/20/2018 <1.0 159 <1.0 <1.0 43.1 1.96 -2nd Qtr (6) 6/14/2018 <1.0 74.9 <1.0 <1.0 40,2'- 1.46
3rd Qtr 9/5/2018 <1.0 53.2 <1.0 <1.0 44 1.18
4th Qtr 12/12/2018 <1.0 37.0 <1.0 <1.0 20.0 0.90
1st Qtr 3/19/2019 <1.0 23.2 <1.0 <1.0 41 0.755
2nd Qtr 6/13/2019 <1.0 15.8 <1.0 <1.0 38.1 0.484
3rd Qtr 9/11/2019 <1.0 15.8 <1.0 <1.0 39.7 0.412
4th Qtr 12/14/2019 <1.0 7.4 <1.0 <1.0 45.7 0.244
1st Qtr 3/17/2020 <1.0 6.93 <1.0 <1.0 43.2 0.222
2nd Qtr 6/11/2020 <1.0 4.9 <1.0 <1.0 42.4 0.205
3rd Qtr 9/18/2020 <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 3/18/2021 <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 9/15/2021 <1.0 3.71 <1.0 <1.0 34.1 0.166
(1) VOCs were resampled because laboratory missed holding ime. (2) Results of the TW4-70 the duplicate sample for TW4-6.
(3) Reanalyzed for VOCs only. (4) As 01 March 2012 both north and south wild life ponds no lonler receiving water.
Å5..Chlorofonn2umpin.2 well TW4-4 stared in 1st 912010
(6) Chloroform pumpinl well TW4-41 installed May 2018
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 3rd Qarter 2021
Chloroform Contamination Investigation
DUSA White Mesa Mill
TW4-7
Sampling Event Parameter
(GWQS)
Carbon Tetrachloride
(5 pg/L)
Chloroform
(70 pg/L)
Chloromethane
(30 pg/L)
Methylene Chloride
(5 pg/L)
Chloride
No GWQS (mg/L)
Nitrate, Nitrate + Nitrite
(10 mg/L)
1st Qtr 3/16/2005 NA 3,100 NA NA NA 5.2 2nd Qtr 5/25/2005 NA 2 700 NA NA NA 5.4 3rd Qtr 8/31/2005 <10 3,100 <10 <10 NA 5.2
4th Qtr 12/7/2005 <50 2,500 <50 <50 52 5.3 ......... 1st Qtr 3/9/2006 <50 1900, <50 <50 48 1 2nd Qtr 6/14/2006 <50 2,200 <50 <50 47 4.5
3rd Qtr 7/20/2006 <50 2,140 <50 <50 51 4.7
4th Qtr 11/8/2006 1.5 2 160 <1.0 <1.0 49 !'.1,. 1st Qtr 2/28/2007 1.1 1,830 <1.0 <1.0 47 6
2nd Qtr 6/27/2007 1.5 2,600 <1.0 <1.0 45 5.1 3rd Qtr 8/15/2007 1.4 2,300 <1.0 <1.0 44 4.7 4th Qtr 10/10/2007 1.2 1,900 <1.0 <1.0 45 ................... 4.7 ....... 1st Qtr 3/28/2008 1.3 2,200 <1.0 <1.0 43 .4.2 2nd Qtr 6/25/2008 1.3 1,800 <1.0 <1.0 43 4.8
3rd Qtr 9/10/2008 1.4 1,600 <1.0 <1.0 35 4.16 4th Qtr 10/15/2008 NA #N/A NA NA 40 4.01 11/18/2008 .0 2 500 <2.0 <2.0 NA 4N/A 1st Qtr 3/11/2009 1.2 1,800 <1.0 <1.0 35 3.7 2nd Qtr 6/23/2009 <1.0 1,400 <1.0 <1.0 37 3.8 3rd Qtr 9/14/2009 1 1,500 <1.0 <1.0 37 4.1
4th Qtr 12/29/2009 <1.0 1,300 <1.0 <1.0 37 4.2 1st Qtr 2/25/2010 <1.0 1,200 <1.0 <1.0 35 3.8
2nd Qtr 6/14/2010 <1.0 1,100 <1.0 <1.0 31 3.9 3rd Qtr 8/11/2010 1 1,500 <1.0 <1.0 36 3.9 4th Qtr 10/15/2010 <1.0 1 100 <1.0 <1.0 38 4
1st Qtr 2/23/2011 <1.0 1,300 <1.0 <1.0 45 3:e
2nd Qtr 6/1/2011 <1.0 1 200 , <1.0 <1.0 35 4.0
3rd Qtr 8/18/2011 <1.0 1,200 <1.0 <1.0 37 4.1
4th Qtr 11/29/2011 <1.0 1 000 <1.0 <1.0 37 3..8 1st Qtr (1) 1/19/2012 <1.0 1 obo <1.0 <1.0 37 4- .:§
2nd Qtr 6/14/2012 <1.0 790 <1.0 <1.0 41 4.0* 3rd Qtr 9/13/2012 <1.0 870 <1.0 <1.0 40 3.8 4th Qtr 10/4/2012 <1.0 940 <1.0 <1.0 41 3.8 1st Qtr 2/13/2013 <1.0 940 <1.0 <1.0 37.7 3.51
2nd Qtr 6/18/2013 <1.0 953 <1.0 <1.0 39.3 4
3rd Qtr 9/12/2013 <1.0 1,040 <1.0 <1.0 36.4 4.17
4th Qtr 11/14/2013 <1.0 1,050 <1.0 <1.0 37.2 4.13 1st Qtr 2/5/2014 5.41 946 <1.0 <1.0 38.2 4.24 2nd Qtr 5/22/2014 4.78 847 <1.0 <1.0 37.7 4.19 3rd Qtr 8/27/2014 <1.0 857 1.5 <1.0 39 2.9 4th Qtr 10/30/2014 <1 0 926 <1.0 <1.0 40.2 3.68
1st Qtr (2) 3/18/2015 <1.0 942 <1.0 <1.0 40.4 4.2
2nd Qtr 6/11/2015 <1.0 950 <1.0 <1.0 42.1 2.62 3rd Qtr 9/10/2015 <1.0 897 <1.0 <1.0 46.7 4.72
4th Qtr 10/29/2015 <1.0 847 <1.0 <1.0 40.6 3.49
1st Qtr 3/22/2016 <1.0 834 <1.0 <1.0 42.4 4.43 2rid Qtr 6/8/2016 <1.0 909 <1.0 <1.0 44.1 3.75 3rd Qtr 8/4/2016 <1.0 1,000 <1.0 <1.0 42.3 4.21 4th Qtr 10/26/2016 <1.0 886 <1.0 <1.0 45.8 4.33
1st Qtr 3/21/2017 <1.0 986 <1.0 <1.0 40.5 3.87
2nd Qtr 6/21/2017 <1.0 968 <1.0 <1.0 43.3 4.15 3rd Qtr 8/4/2017 <1.0 1,070 <1.0 <1.0 44.7 4.20 4th Qtr 10/11/2017 <1.0 884 <1.0 <1.0 43.7 4.35 DWMRC split.saTolo. <7.6 890 <12 17 J 42.0 4.30
1st Qtr 3/21/2018 <1.0 721 <1.0 <1.0 44.5 3.96 2nd Qtr 6/14/2018 <1.0 751 <1.0 <1.0 41.5 4.45
3rd Qtr 9/6/2018 <1.0 781 <1.0 <1.0 48.5 4.34
4th Qtr 12/13/2018 <1.0 838 <1.0 <1.0 42.8 3.98 1st Qtr 3/20/2019 <1.0 736 <1.0 <1.0 41.3 4.01 2nd Qtr 6/19/2019 <1.0 862 <1.0 <1.0 43.0 4.19
3rd Qtr 9/12/2019 <1.0 801 <1.0 <1.0 39.6 3.76
4th Qtr 12/18/2019 <1.0 546 <1.0 <1.0 47.2 3.11
ist Qtr 3/18/2020 <1.0 746 <1.0 <1.0 42.1 3.75
2nd Qtr 6/12/2020 <1.0 864 <1.0 <1.0 44.1 4.06 Deplicate TW4-75 <1.0 871 <1.0 <1.0 43.1 4.19 3rd Qtr 9/19/2020 <1.0 971 <1.0 <1.0 41.5 3.87
4th Qtr 11/11/2020 <1.0 967 <1.0 <1.0 42.8 4.40
DWMRC sOt sanTle <10 930 <20 <20 43 ...po
lst Qtr 3/24/2021 <1.0 875 <1.0 <1.0 46.2 .4..25
2nd Qtr 6/17/2021 <1.0 819 <1.0 <1.0 41.7 4.80 3rd Qtr 9/23/2021 <1.0 801 <1.0 <1.0 42.8 4.58
.olh wed Ore pond, no longer recelvIng water
I Id TVV4-2 started in 1/14/15
NA and #N/A(for graphs) = not analyzed Shaded indicates concentrations exceeding GWQS. Bold and italics indicates the MDL exceeded the GWQS. J = Approximated value
TABLE 1 (11 of 33)
Historic Summary Of Monitoring Well Analytical Results Up To The 3rd garter 2021
Chloroform Contamination Investigation
DUSA White Mesa Mill
TW4-8
Sampling Event
Parameter
(GWQS)
Carbon Tetrachloride
(5 pg/L)
Chloroform
(70 pg/L)
Chloromethane
(30 pg/L)
Methylene Chloride
(5 pg/L)
Chloride
No GWQS (mg/L)
Nitrate, Nitrate + Nitrite
(10 mg/L)
1st Qtr 3/16/2005 NA 10 NA NA NA <0.1,
2nd Qtr 5/25/2005 NA <1.0 NA NA NA 0.2
3rd Qtr 8/31/2005 <1.0 1.1 1.7 NA NA <1.0
4th Qtr 12/7/2005 <1.0 <1.0 <1.0 < i .0 41 <1 0
1st Qtr 3/9/2006 <1.0 1.3 2.1 <1.0 39 0.3
2nd Qtr 6/14/2006 <1.0 1.8 1.0 , , <1.0 37 <1.0
3rd Qtr 7/20/2006 <1.0 <1.0 <1 .0 <1 .0 39 0.1
4th Qtr 11/8/2006 <1.0 <1.0 <1.0 <1.0 40 <.1
1st Qtr 2/28/2007, <1.0 2.5 <1.0 <1.0 39 0.7
2nd Qtr 6/27/2007 <1.0 2.5 <1.0 <1.0 42 0.2
3rd Qtr .8/15/2007 <1.0 1.5 <1.0 <1.0 42 <1.0
4th Qtr i 0/10/2007 <1.0 3.5 <1.0 <1.0 43 0.5 ............ 1st Qtr 3/28/2008 <1.0 <1.0 <1.0 <1.0 46 „ 0.1
2nd dtr 6/25/2008 <1..0 <1.0 <1.0 <1.0 45 , . <1.0 .
3rd Qtr 9/10/2008 <1.0 <1.0 . .. <1.0 <1.2 , 39 <0.05
4th Qtr 10/15/2008 <1.0 <1.0 <1.0 <1.0 44 <0.05
1st Qtr 3/4/2009 <1.0 <1.0 <1.0 <1.0 42 <0.1 ,.
2nd Qtr 6/23/2009 <1.0 <1.0 <1.0 <1.0 , ...„, 44 <0.1
3rd Qtr 9/14/2009 .. <1.0 <1.0 <1.0 <1.0 44 <0.1
4th Qtr 12/17/2009 <1.0 <1.0 <1.0 <1.0 51 <0.1
1st Qtr 2/24/2010 <1.0 <1.0 <1.0 <1.0 57 <0.1
2nd Qtr 6/14/2010 <1.0 <1.0 <1.0 <1.0 42. <0.1
3rd Qtr 8/18/2010 <1.0 <1.0 <1.0 <1.0 45. <0.1
4th Qtr 10/15/2010 <1.0 <1.0 <1.0 <1.0 46 ...ki.
1st Qtr 2/16/2011 <1.0 <1.9 <1.0 <1.0 52 <0.1
2nd Qtr 5/25/2011 <1.0 <1.0 <1.0 <1.0 45 0.1
3rd Qtr 8/16/2011 <1.0 <1.0 <1.0 <1.0 46 0.1
4th Qtr 11/16/2011 45 0.2

(1) 12/7/2011

Tit' Otr (3) 1/18/2012
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0 <1.0 NA 45 #N/A ....15... . -2nd Qtr 5/13/2012 <1.0 <1.0 <1.0 <1.0 44 0.2
3rd Qtr 8/29/2012 <1.0 <1.0 <1.0 <1.0 48 0.1
4th Qtr 10/3/2012 <1.0 <1.0 <1.0 <1.0 47 <0.1
1st Qtr 2f7/2013 <1.0 <1.0 <1.0 <1.0 46.6 0.41
2nd Qtr 5/30/2013 <1.0 <1.0 <1.0 <1.0 45.5 <0.1 .. „
3rd Qtr 9/5/2013 ... <1.0 <1.0 <1.0 <1.0 47.5 0.1
4th Qtr 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 0.166
(2) 2/6/2014 <1.0 100 <1.0 <1.0 46.5 0.166
2nd Qtr 5/22/2014 <1.0 122 <1.0 <1.0 53 0.538
3rd Qtr 8/27/2014 <1.0 107 <1.0, <1.0 47 0.6
4th Qtr 10/29/2014 <1.0 191 <1.0 <1.0 46.7 0.914
-1st Qtr (4) 3/12/2015 <1.0 961 <1,.0, <1.0 49.6'- 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
41h Qtr 10/29/2015 <1.0 770 <1.0 <1.0 52 2.2
1st Qtr,.. 3/17/2016 <1.0 634 <1.0 <1.0 54.2 2.48
2nd Qtr 6/8/2016 <1 0 595 <1.0 <1.0 58.7 2.14
3rd Qtr 8/4/2016 <1.0 522 <1.0 <1.0 56.9 2.10
4th Qtr 10/27/2016 <1.0 472 <1.0 <1.0 60.1 2.16
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 <1.0 223 <1.0 <1.0 61.2 1.64
410...gy.......... 10/11/2017 <1.0 214 <1.0 <1.0 52.2 1.92
Deplicate TW4-75 <1.0 194 1.12 <1.0 56.2 1.71
DWMRC split sample <1.9 230 <3.0 61 1.90
1st Qtr 3/21/2018 <1.0 220 <1.0 <1.0 60.8 1.36
Deplicate TW4-75 <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 i .35
1st Qtr 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
Deplicate TW4-75 <1.0 75.6 <1.0 <1.0 52.5 1.636
4th Qtr 12/18/2019 <1.0 84.4 <1.0 <1.0 60.1 1.21 ............... 1st Qtr 3/18/2020 <1.0 55.0 <1.0 <1.0 53.8 1.04
2nd Qtr 6/12/2020 <1. b 53.8 <1.0 <1.0 56.9 1.06
3rd Qtr 9/18/2020 <1.0 39.5 <1 .b <1.0 52.6 0.894
4th Qtr 11/11/2020 <1.0 51.3 <1.0 <1.0 54.7 1.27
Deplicate TW4-70 <1.0 52.9 <1.0 <1.0 49.9 1.27
DWMRC split samplp <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
Deplicate TW4-70 <1.0 16.4 <1.0 <1.0 43.1 0.59
(1) VOCs were resampled because laboratory missed holding time.
(2) Resampled to verify chlorofo m concentration that was collected on 1/23/14.
(3) As of March 2012 both north and south wild fife ponds no longer recendng water
(4) chloroform pumping wells 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 3rd Qarter 2021
Chloroform Contamination Investigation
DUSA White Mesa Mill
TW4-9
Sampling Event
Parameter
(GWQS) Carbon Tetrachloride
(5 pg/L)
Chloroform
(70 pg/L)
Chloromethane
(30 pg/L)
Methylene Chloride
(5 pg/L)
Chloride
No GWQS (mg/L)
Nitrate, Nitrate + Nitrite
(10 mg/L)
1st Qtr 3/16/2005 NA 3.8 NA NA NA 1.3
2nd Qtr 5/25/2005 NA 1.2 NA NA NA 1.3
3rd Qtr 8/31/2005 <1.0 <1.0 2.9 <1.0 NA 1.3
4th Qtr 12/7/2005 <1.0 <1.0 <1.0 <1.0 42 ......... 1.3 ........... 1st Qtr 3/9/2006 <1.0 <1.0 2.6 <1.0 38 1.5
2nd Qtr 6/14/2006 <1.0 19 2.7 <1.0 39 1.5
3rd Qtr 7/20/2006 <1.0 <1.0 <1.0 <1.0 41 0.9
4th Qtr 11/8/2006 <1.0 <1.0 <1.0 <1.0 44 0.7
1st Qtr 2/28/2007 <1.0 <1.0 <1.0 <1.0 44 0.6
2nd 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
41h 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
4th Qtr 10/15/2008 <1.0 <1.0 <1.0 <1.0 58 1.99
1st Qtr 3/4/2009 <1.0 <1.0 <1.0 <1.0 30 2.5
2nd Qtr 6/23/2009 <1.0 <1.0 <1.0 <1.0 30 2.3
3rd Qtr 9/14/2009 <1.0 <1.0 <1.0 <1.0 30 2.5
4th Qtr 12/17/2009 <1.0 <1.0 <1.0 <1.0 37 1.7
1st Qtr 2/23/2010 <1.0 <1.0 <1.0 <1.0 47 1.4
2nd Qtr 6/14/2010 <1.0 <1.0 <1.0 <1.0 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
1st Qtr 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) 12/7/2011 <1.0 <1.0 <1.0 <1.0 NA #N/A 1st Qtr ay 1/18/2012 <1.0 <1.0 <1.0 <1.0 28 4- 2.3
-2nd Qtr 5/31/2012 <1.0 <1.0 <1.0 <1.0 23 4. ð
3rd Qtr 8/30/2012 <1.0 <1.0 <1.0 <1.0 22 3.9
4th Qtr 10/3/2012 <1.0 <1.0 <1.0 <1.0 21 3.8
1st Qtr 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 <1.0 23.6 4.87
1st Qtr 1/29/2014 <1.0 <1.0 <1.0 <1.0 22 4.36
2nd Qtr 5/22/2014 <1.0 6.9 <1.0 <1.0 24 3.44
3rd Qtr 8/14/2014 <1.0 47 <1.0 <1.0 27 2.7
4th Qtr 10/29/2014 <1.0 101 <1.0 <1.0 25 4.29
1st Qtr 3/12/2015 <1.0 53.5 <1.0 <1.0 29.5 3.28
2nd Qtr 6/11/2015 <1.0 35.1 <1.0 <1.0 35.3 1.83
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 2.89 ............_. 1st Qtr 3/17/2016 <1.0 74.3 <1.0 <1.0 33.6 2.51
2nd Qtr 6/8/2016 <1.0 76.2 <1.0 <1.0 35.1 2.16
3rd Qtr 8/3/2016 <1.0 76.8 <1.0 <1.0 33.6 2.11
41h Qtr 10/26/2016 <1.0 76.0 <1.0 <1.0 37.4 2.24
1st Qtr 3/17/2017 <1.0 113 <1.0 <1.0 34.5 2.18
2nd Qtr 6/21/2017 <1.0 113 <1.0 <1.0 35.9 1.92
3rd Qtr 8/3/2017 <1.0 118 <1.0 <1.0 37 1.90
4th Qtr 10/11/2017 <1.0 132 <1.0 <1.0 32 2.18
DWMRC split sample <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
Deplicate TW4-75 <1.0 132 <1.0 <1.0 35.2 1.91
3rd Qtr 9/5/2018 <1.0 94.2 <1.0 <1.0 43.4 1.04
Deplicate TW4-75 <1.0 92.4 <1.0 <1.0 42.7 1.11
41h Qtr 12/13/2018 <1.0 109 <1.0 <1.0 36.3 1.23
1st Qtr 3/19/2019 <1.0 86.4 <1.0 <1.0 36.9 1.09
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
Deplicate 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 DVVMRC Dup sample (TW4-51) <10 46.0 <20 <20 38 0.97
1st Qtr 3/18/2021 <1.0 39.0 <1.0 <1.0 40.7 T:L%
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
(1) VOCs were resampled because laboratory missed holding time. (2) As of March 2012 both north and s,,
NA Tncr #71741G-irZti;7 7or an'a)cze'd Shaded indicates concentrations exceeding GWQS.
J = Approximate value
TABLE 1 (13 of 33)
Historic Summary Of Monitoring Well Analytical Results Up To The 3rd Qarter 2021
Chloroform Contamination Investigation
DUSA White Mesa Mill
TW4-10
Sampling Event
Parameter
(GWQS)
Carbon Tetrachloride
(5 pg/L)
Chloroform
(70 pg/L)
Chloromethane
(30 pg/L)
Methylene Chloride
(5 pg/L)
Chloride
No GWQS (mg/L)
Nitrate, Nitrate + Nitrite
(10 mg/L)
1st Qtr 3/16/2005 NA 140 NA NA NA 1.6
2nd Qtr 5/25/2005, NA 62 NA NA NA 0.8
3rd Qtr 8/31/2005 <2.5 110 6.2 <2.5 NA 1.1
4th Qtr 12/7/2005 <2.5 300 <2.5 <2.5 52 ....... .3.9
1st Qtr 3/9/2006 <5.0 190 <5.0 <5.0 50 -2.4
2nd Qtr 6/14/2006 <5.0 300 <5.0 <5.0 54 3.5
3rd Qtr 7/20/2006 <5.0 504 <5.0 <5.0 61 6.8
4th Qtr 11/8/2006 <1.0 452 1.6 <1.0 58 5.7
1st Qtr 2/28/2007 <1.0 500 <1.0 <1.0 2 7.9
2nd Qtr 6/27/2007 <1.0 350 <1.0 <1.0 54 5.1
3rd Qtr 8/15/2007 <1.0 660 <1.0 <1.0 59 7,3 4th Qtr 10/10/2007 <1.0 470 <1.0 <1.0 59 6.7
1st Qtr 3/28/2008 <1,.0 620 <1.0 <1.0 55 7.3
2nd Qtr 6/25/2008 <1.0 720 <1.0 <1.0 58 9.9
3rd Qtr 9/10/2008 <1.0 ..„„... . sea <1.0 <1.0 51 9.23
4th Qtr 10/15/2008
11/18/2008
NA
<2.0
#N/A , 1 200
NA
<2.0
NA
<2.0
61
NA #N/A
10.5
1st Qtr 3/11/2009 <1.0 1,100 <1.0 <1.0 64 11.6
2nd Qtr, 6/23/2009 <1.0 1200., <1.0 <1.6 62 9.8
3rd Qtr 9/14/2009 <1.0 910 <1.0 <1.0 51, 8.1
4th Qtr 12/22/2009 <1.0 300 <1.0 <1.0 51 3.8
1st Qtr 3/3/2010 <1.0 460 <1.0 <1.0 48 5.0
2nd Qtr 6/14/2010 <1.0 220 <1.0 <1.0 .42 1.6
3rd Qtr 8/12/2010 <1.0. 100 <1.0 <1.0 38 0.8
4th Qtr 10/15/2010 <1.0 1,100 <1.0 <1.0 52 11.0
1st Qtr 2/23/2011 <1.0 620 <1.0 <1.0 32 9.0
2nd Qtr 5/14/2011 <1.0 280 <1.0 , <1.0 42 3.3
3rd Qtr 8/17/2011 <1.0 180 <1.0 <1.0 . 41 1.9
4th Qtr 11/16/2011 <1.0 110 <1.0 <1.6 45 1.1
1 sfilir .1T) 1/19/2012 76 <1.0 <1.0 40 _ 0.9
2nd Qtr 6/14/2012 <1.0 79 , <1.0 <1.0 46 0.6
3rd Qtr 9/12/2012 , <1.0 130 <1.0 <1.0 . 44 1.0
4th Qtr 10/3/2012 <1.0 140 <1.0 <1.0 45 1.6
1st Qtr 2/13/2013 <1.0 , 154 <1.0 <1.0 49.1 1.2
2nd Qtr 6/13/2013 <1.0 486 <1.0 <1.0 51.5 5.6
3rd Qtr 9/12/2013 <1.0 1,126 <1.0 <1.0 67.9 13.0
4th Qtr 11/14/2013 <1.0 1 380 <1.0 <1.0 70.9 ....1.6:0.
lst Qtr 1/29/2014 5.16 1,260 <1.0 <1.0 73 16.8
2nd Qtr 5/23/2014 <1,0 1,110 <1.0 <1.0 77.3 13.9
3rd Qtr 8/27/2014 , <1.0 , 1,060 1.5 <1.0 74, 9.8
4th Qtr 10/30/2014 <1.0 1 220 <1.0 <1.0 75.2 13.2
1st Qtr 3/18/2015 <1.0 .1,210 <1.0 <1.0 78.6 15.0
2nd Qtr 6/11/2015 <1.0 1,240 <1.0 <1.0 75 11.4
3rd Qtr 9/10/2015 <1.0 1,280 <1.0 <1.0 89.5 14.0
4th Qtr 10/29/2015 <1.0 1 350 <1.0 <1.0 79.9 13.5
1st Qtr 3/22/2016 <1.0 1,430 <1.0 <1.0 84.1. 17.3
2nd Qtr 6/8/2015 <1.0 1,510 <1.0 <1.0 89.5 14.9
3rd Qtr 8/4/2016 <1.0 1,500 <1.0 <1.0 85.3 14.9
4th Qtr 10/26/2016 <1.0 laso _ <1.0 <1.0 84.4 14.8
1st Qtr 3/21/2017 <1.0 1,260 <1.0 <1.0 74.6 13.0
2nd Qtr 6/21/2017 <1.0 1,140 <1.0 <1.0 73.1 13.0
3rd Qtr 8/4/2017 , <1.0 1,320 <1.0 <1.0 77 13.4
4th Qtr 10/11/2017 <1.0 1,150 <1.0 <1.0 70 12.9
IDIA/MRC spilt sample
1st Qtr 3/21/2018
<9.5
<1.0
1 100 1,240 <15 <1.0 <1.0
16 J 76
72.7.
13.0 ......... .11.1
2nd Qtr 6/14/2018 <1.0 914 <1.0 <1.0 64.e 11.2
3rd Qtr 9/6/2018 <1.0 . 911 <1.0 <1.0 75.5 10.1
4th Qtr 12/13/2018 <1.0 1,070 <1.0 <1.0 63.5 10.6
1st Qtr 3/20/2019 <1.0 869 <1.0 <1.0 59.3 9.34
2nd Qtr 6/19/2019 <1.0 799 <1.0 <1.0 58.7 8.86
3rd otr 9/12/2019 <1.0 734 <1.0 <1.0 .55.8 7.79
4th Qtr 12/18/2019 <1.0 768 <1.0 <1.0 52 6.89 ............
1st Qtr 3/18/2020 <1.0 798 <1.0 <1.0 53.5 7.83
2nd Qtr 6/11/2020 <1.0 928 <1.0 <1.0 60.1 8.13
3rd Qtr 9/19/2020 <1.0 854 <1.6 „ ... <1.0 53.9 7.34
4th Qtr 11/11/2020 <1.0 903 <1.0 <1.0 58.6 ............... 8.69 ............
1st Qtr 3/18/2021 <1.0 718 <1.0 <1.0 58.1 7.20
2nd Qtr 6/17/2021 <1.6 sos <1.0 <to, 48.7 7.75
3rd Qtr 9/23/2021 <1.0 545 <1.0 <1.0 50.6 6.35
(1) As of March 2012 both north and south wild hfe ponds no longer ece,Ing water
NA and #N/A(for graphs) = not analyzed Shaded indicates concentrations exceeding GWQS.
J = Approximate value
TABLE 1 (14 of 33)
Historic Summary Of Monitoring Well Analytical Results Up To The 3rd Qarter 2021
Chloroform Contamination Investigation
DUSA White Mesa Mill
TW4-11 (chloroform pumping well started 1/14/15)
Sampling Event
Parameter
(GWQS)
Carbon Tetrachloride
(5 pg/L)
Chloroform
(70 pg/L)
Chloromethane
(30 pg/L)
Methylene Chloride
(5 pg/L)
Chloride
No GWQS (mg/L)
Nitrate, Nitrate + Nitrite
(10 mg/L)
1st Qtr 3/16/2005 NA 4,400 NA NA NA 8.7
2nd Qtr 5/25/2005 NA 3,590 NA NA NA 10.3
3rd Qtr 8/31/2005 <10 4,400 <10 <10 NA 9.4
4th Qtr 12/7/2005 <100 4,400 <100 <100 58 9.4
1st Qtr 3/9/2006 <50 4,400 <50 <50 56 9.2
2nd Qtr 6/14/2006 <50 4,300 <50 <50 56 10.0
3rd Qtr 7/20/2006 <50 4,080 <50 <50 55 10.0
4th Qtr 11/8/2006 1.7 3 660 2.7 1.3 55 _ .____...._... 10.0
•.........._ 1st Qtr 2/28/2007 1.3 3,600 <1.0 1.6 54 10.1
2nd Qtr 6/27/2007 1.6 3,800 <1.0 <1.0 53 10.6
3rd Qtr 8/15/2007 1.7 4,500 <1.0 <1.0 53 10.2
4th Qtr 10/10/2007 1.6 4 400 <1.0 1.2 53 9.8 .............. 1st Qtr 3/28/2008 <1.0 340 <1.0 <1.0 63 7.7
2nd Qtr 6/25/2008 <1.0 640 <1.0 <1.0 46 7.3
3rd Qtr 9/10/2008 <1.0 900 <1.0 <1.0 42 7.9
4th Qtr 10/15/2008 NA #N/A NA NA 47 9.5
11/18/2008 <2.0 14000 <2.0 <2.0 NA #N/A
ist Qtr 3/11/2009 <1.0 1,000 <1.0 <1.0 49 7.3
2nd Qtr 6/23/2009 <1.0 980 <1.0 <1.0 44 6.8
3rd Qtr 9/14/2009 <1.0 1,000 <1.0 <1.0 49 7.0
4th Qtr 12/22/2009 <1.0 860 <1.0 <1.0 46 6.6
1st Qtr 3/3/2010 <1.0 820 <1.0 <1.0 42 6.8
2nd Qtr 6/14/2010 <1.0 820 <1.0 <1.0 40 6.9
3rd Qtr 8/12/2010 <1.0 800 <1.0 <1.0 43 6.7
4th Qtr 10/15/2010 <1.0 720 <1.0 <1.0 49 6.4
1st Qtr 2/23/2011 <1.0 1,000 <1.0 <1.0 46 6.5
2nd Qtr 6/1/2011 <1.0 930 <1.0 <1.0 49 7.3
3rd Qtr 8/17/2011 <1.0 820 <1.0 <1.0 48 7.1
4th Qtr 11/16/2011 <1.0 1500 <1.0 <1.0 46 7.1
Tit MT' 1/24/2012 <1.0 610 <1.0 <1.0 43 6.8
2nd Qtr 6/13/2012 <1.0 660 <1.0 <1.0 52 6.f
3rd Qtr 9/13/2012 <1.0 740 <1.0 <1.0 49 3.0
4th Qtr 10/3/2012 <1.0 730 <1.0 <1.0 50 7.0
1st Qtr 2/13/2013 •• 3.23 867 <1.0 <1.0 47.3 6.8
2nd Qtr 6/18/2013 <1.0 788 <1.0 <1.0 49.3 7.4
3rd Qtr 9/12/2013 <1.0 865 <1.0 <1.0 46.6 7.8
4th Qtr 11/13/2013 <1.0 874 <1.0 <1.0 46.7 _8,81 1st Qtr 215/2014 5.19 785 <1.0 <1.0 48.5 8.47
2nd Qtr 5/23/2014 <1.0 751 <1.0 <1.0 51.6 6.92
3rd Qtr 8/27/2014 <1.0 719 1.2 <1.0 48 _ 5.4
4th Qtr 10/29/2014 <1.0 803 <1.0 <1.0 56.4 1- 7.33
1st Qtr(2) 3/9/2015 1.24 2,450 <1.0 <1.0 49.8 8.72
2nd Qtr 6/11/2015 <1.0 2,710 <1.0 <1.0 62.2 8.48
3rd Qtr 8/31/2015 <1.0 1,120 <1.0 <1.0 73.1 9.61
4th Qtr 10/29/2015 <1.0 2 730 <1.0 <1.0 55.3 7.5
1st Qtr 3/9/2016 1.2 2,660 <1.0 <1.0 55.5 7.13
2nd Qtr 5/23/2016 2.19 3,340 <1.0 <1.0 56.4 7.81
3rd Qtr 7/25/2016 <1.0 3 200 <1.0 <1.0 55.3 8.83
41h Qtr 10/12/2016 <1.0 3 200 <1.0 <1.0 57.2 8.92
1st Qtr 3/8/2017 1.71 3,310 <1.0 <1.0 49.8 8.12
2nd Qtr 6/13/2017 1.83 3,370 <1.0 <1.0 51.4 7.92
3rd Qtr 7/26/2017 1.81 3,290 <1.0 <1.0 51 7.78
4th Qtr 10/11/2017 1.48 2,880 <1.0 <1.0 49.7 7.79
DWMRC spht samle <38 2 900 <60 140 J 52 8.0
1st Qtr 3/12/2018 1.82 3,060 <1.0 <1.0 54 7.89
2nd Qtr 6/8/2018 1.34 2,800 <1.0 <1.0 52.4 7.51
3rd Qtr 8/22/2018 1.47 3,050 <1.0 <1.0 53.3 7.15
4th Qtr 11/28/2018 1.33 2 930 <1.0 <1.0 45.4 6.85.
lst Qtr 3/8/2019 1.48 2820 <1.0 <1.0 46.8 7.50
2nd Qtr 6/5/2019 1.52 2970 1.4 <1.0 45.3 8.30
3rd Qtr 9/4/2019 1.47 2,790 <1.0 <1.0 48.8 7.15
4th Qtr 12J18/2019 <1.0 3,250 <1.0 <1.0 49.0 7.14
1st Qtr 2/19/2020 <1.0 2,990 <1.0 <1.0 51.9 7.07
2nd Qtr 5/11/2020 1.37 2,810 <1.0 <1.0 48.6 7.56
3rd Qtr 9/4/2020 1.47 3,070 <1.0 <1.0 46.3 7.59
4th Qtr 10/28/2020 <1.0 24670 3.86 <1.0 43.3 7.19
ist Qtr 2/23/2021 <1.0 2,750 <1.0 <1.0 49.5 7.21
2nd Qtr 6/9/2021 <1.0 3,320 <1.0 <1.0 37.7 8.17
3rd Qtr 8/24/2021 <1 0 2,600 <1.0 <1.0 40.2 5.78
(1) As of March 2012 both non ponds no longer re( ing water.
AChlorotorm pumping well started 1/14/15.
NA = not analyzed
Bold and italics indicates the MDL exceeded the GWQS.
Bold and italics indicates the MDL exceeded the GWQS. J = Approximated value
TABLE 1 (15 of 33)
Historic Summary Of Monitoring Well Analytical Results Up To The 3rd Qarter 2021
Chloroform Contamination Investigation
DUSA White Mesa Mill
TW4-12
Sampling Event
Parameter
(GWQS) Carbon Tetrachloride
(5 pg/L)
Chloroform
(70 pg/L)
Chloromethane
(30 pg/L)
Methylene Chloride
(5 pg/L)
Chloride
No GWQS (mg/L)
Nitrate, Nitrate + Nitrite
(10 mg/L)
1st Qtr 3/16/2005 NA <1.0 NA NA NA 1.4 2nd Qtr 5/25/2005 NA <1.0 NA NA NA 1.6
3rd Qtr 8/31/2005 <1.0 <1.0 5.8 <1.0 NA 1.5
4th Qtr 12/7/2005 <1.0 <1.0 1.0 <1.0 19 1.4
1st Qtr 3/9/2006 <1.0 <1.0 2.6 <1.0 19 1.3
2nd Qtr 6/14/2006 <1.0 <1.0 1.4 <1.0 16 1.4
3rd Qtr 7/20/2006 <1.0 <1.0 1.4 <1.0 16 1.4
4th Qtr 11/8/2006 <1.0 <1.0 <1.0 <1.0 16 1.4 ........ 1st Qtr 2/28/2007 <1.0 <1.0 <1.0 <1.0 16 1.5
2nd Qtr 6/27/2007 <1.0 <1.0 <1.0 <1.0 18 1.5
3rd Qtr 8/15/2007 <1.0 <1.0 <1.0 <1.0 29 1.4 4th Qtr 10/10/2007 <1.0 <1.0 <1.0 <1.0 16 1 4
1st Qtr 3/28/2008 <1.0 <1.0 <1.0 <1.0 16 1.6
2nd Qtr 6/25/2008 <1.0 <1.0 <1.0 <1.0 19 2.7
3rd Qtr 9/10/2008 <1.0 <1.0 <1.0 <1.0 18 2.7
4th Qtr 10/15/2008 <1.0 <1.0 <1.0 <1.0 22 ............. 2.5 .......... 1st Qtr 3/11/2009 <1.0 <1.0 <1.0 <1.0 23 2.4
2nd Qtr 6/23/2009 <1.0 <1.0 <1.0 <1.0 22 3.8
3rd Qtr 9/14/2009 <1.0 <1.0 <1.0 <1.0 22 5.1
4th Qtr 12/16/2009 <1.0 <1.0 <1.0 <1.0 23 3.6
1st Qtr 2/23/2010 <1.0 <1.0 <1.0 <1.0 22 4.0
2nd Qtr 6/14/2010 <1.0 <1.0 <1.0 <1.0 29 11.0 3rd Qtr 8/10/2010 <1.0 <1.0 <1.0 <1.0 35 9.0
4th Qtr 10/15/2010 <1.0 <1.0 <1.0 <1.0 31 8.0 ........ 1st Qtr 2/15/2011 <1.0 <1.0 <1.0 <1.0 31 6.5
2nd Qtr 5/25/2011 <1.0 <1.0 <1.0 <1.0 32 7.0
3rd Qtr 8/16/2011 <1.0 <1.0 <1.0 <1.0 31 6.8 4th Qtr 11/15/2011 <1.0 <1.0 <1.0 <1.0 30 8.0 ...... lifo ti- (T) 1/17/2012 <1.0 <1.0 <1.0 <1.0 28 7.7
.2nd Qtr 5/31/2012 <1.0 <1.0 <1.0 <1.0 34 10.0
3rd Qtr 8/29/2012 <1.0 <1.0 <1.0 <1.0 39 13.0
4th Otr 10/3/2012.1.<1.0 <1.0 <1.0 <1.0 39 13.0
1st Qtr 2/13/20131<1.0 <1.0 <1.0 <1.0 36.7 12.6
2nd Qtr 5/29/2013 <1.0 <1.0 <1.0 <1.0 38.6 14.2
3rd Qtr 8/29/2013 <1.0 <1.0 <1.0 <1.0 41.7 17.4
4th Qtr 11/6/2013 .<1.0 <1.0 <1.0 <1.0 41.4 16.4
1st Qtr 1/22120141<1.0 <1.0 <1.0 <1.0 41.6 18.4
2nd Qtr 5/21/2014 <1.0 <1.0 <1.0 <1.0 40.2 17.0
3rd Qtr 8/27/2014 <1.0 <1.0 <1.0 <1.0 47 13.0
4th Qtr 10/23/2014 <1.0 <1.0 <1.0 <1.0 50.2 16.1
1st Qtr 3/11/2015 <1.0 <1.0 <1.0 <1.0 50.6 19.2
2nd Qtr 6/10/2015 <1.0 <1.0 <1.0 <1.0 56 18.8
3rd Qtr 9/2/2015 <1.0 <1.0 <1.0 <1.0 60.2 16.4
4th Qtr 10/21/2015 <1.0 <1.0 <1.0 <1.0 51 18.0
Rkplicate TW4-65 <1.0 <1.0 <1.0 <1.0 51.3 18.0
1st Qtr 3/15/2016 <1.0 <1.0 <1.0 <1.0 56.2 34.8
2nd Qtr 5/25/2016 <1.0 <1.0 <1.0 <1.0 66.4 30.7
Deplicate TW4-6 5/25/2016 <1.0 <1.0 <1.0 <1.0 67 113.0
3rd Qtr 7/27/2016 <1.0 <1.0 <1.0 <1.0 67.5 37.7
4th Qtr 10/12/2016 <1.0 <1.0 <1.0 <1.0 72.6 25.8
1st Qtr 3/14/2017 <1.0 <1.0 <1.0 <1.0 62.6 25.9
2nd Qtr 6/14/2017 <1.0 1.25 <1.0 <1.0 67.2 29.9
3rd Qtr 8/2/2017 <1.0 1.2 <1.0 <1.0 65.3 25.1
Deplicate TW4-70 <1.0 1.19 <1.0 <1.0 67 26.7
4th Qtr 10/10/2017 <1.0 <1.0 <1.0 <1.0 56.2 26.9
Deklicate TW4-70 <1.0 <1.0 <1.0 <1.0 61.4 26.8
1st Qtr 3/14/2018 <1.0 <1.0 <1.0 <1.0 59.5 19.8
2nd Qtr 6/12/2018 <1.0 <1.0 <1.0 <1.0 53.6 18.4
3rd Qtr 8/29/2018 <1.0 <1.0 <1.0 <1.0 59.9 13.6
4th Qtr 11/30/2018 <1.0 <1.0 <1.0 <1.0 56.1 10.4 .............. 1st Qtr 3/16/2019 <1.0 <1.0 <1.0 <1.0 50.8 10..1
2nd Qtr 6/13/2019 <1.0 <1.0 <1.0 <1.0 55.3 8.31
3rd Qtr 9/11/2019 <1.0 <1.0 <1.0 <1.0 52.6 8.88
4th Qtr 12/14/2019 <1.0 <1.0 <1.0 <1.0 58.0 8.04
1st Qtr 3/17/2020 <1.0 <1.0 <1.0 <1.0 53.0 6.39
2nd Qtr 6/11/2020 <1.0 <1.0 <1.0 <1.0 51.7 4.95
3rd Qtr 9/17/2020 <1.0 <1.0 <1.0 <1.0 50.3 2.34
4th Qtr 11/4/2020 <1.0 <1.0 <1.0 <1.0 48.0 5.91
1st Qtr 3/17/2021 <1.0 <1.0 <1.0 <1.0 52.0 3.10
2nd Qtr 6/15/2021 <1.0 <1.0 <1.0 <1.0 51.8 2.39 3rd Qtr 9/15/2021 <1.0 <1.0 <1.0 <1.0 36.1 1.95
(1) 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 (16 of 33)
Historic Summary Of Monitoring Well Analytical Results Up To The 3rd Qarter 2021
Chloroform Contamination Investigation
DUSA White Mesa Mill
TW4-13
Sampling Event
Parameter
(GWQS) Carbon Tetrachloride
(5 pg/L)
Chloroform
(70 pg/L)
Chloromethane
(30 pg/L)
Methylene Chloride
(5 pg/L)
Chloride
No GWQS (mg/L)
Nitrate, Nitrate + Nitrite
(10 mg/L)
1st Qtr 3/16/2005 NA <1.0 NA NA , NA 4.2 2nd Qtr 5/25/2005 NA <1.0 NA IIA NA 4.3
3rd Qtr 8/31/2005 <1.0 <1.0 3.1 <1.0 NA 4.6
4th Qtr 12/7/2005 <1.0 <1.0 <1.0 <1.0 69 4.3 1st Qtr 3/9/2006 <1.0 <1,.0 1.7 <1.0 67 4.2 2nd Qtr 6/14/2006 <1.0 <1.0 1.4 <1.0 66 4.9
3rd Qtr 7/20/2006 <1.0 <1.0 <1.0 <1.0 65 4.3
4th Qtr 11/8/2006 <1.0 <1.0 <1.0 <1.0 33 0.8
1st Qtr 2/28/2007 <1.0 <1.0 <1.0 <1.0 59 4.0 2nd Qtr 6/27/2007 <1.0 <1.0 <1.0 <1.0 59 4.6 3rd Qtr 8/15/2007 <1.0 <1.0 <1.0 <1.0 58 4.4
4th Qtr 10/10/2007 <1.0 <1.0 <1.0 <1.0 58 4.1
1st Qtr 3/28/2008 <1.0 <1,.0 <1.0 <1.0 54 3.8
2nd Qtr 6/35/3008 <1.0 <1.0 <1.6 <1.0 58 4.2 3rd Qtr 9/10/2008 <1.0 <1.0 <1.0 <1.0 50 4.3 4th Qtr 10/15/2008 <1.0 <1.0 <1.0 <1.0 58 ............ 4.6 .............. 1st Qtr 3/4/2009 <1.0 <1.0 <1.0 <1.0 58 3.7 2na bir 6/23/2009 <1.0 <1.0 <1.0 <1.0 57 1.2 3rd Qtr 9/14/2009 <1.0 <1.0 <1.0 <1.0 ,63 4.7 4th Qtr 12/16/2009 <1.0 <1.0 <1.0 <1.0 60 4.1 1st Qtr 2/24/2010 <1.0 <1.0 <1.0 <1.0 53 4.3
2nd Qtr 6/14/2010 <1.0 <1.0 <1.0 <1.0 53 5.2
3rd Qtr 8/10/2010 <1.0 <1.0 , <1.0 <1.0 55 5.6
4th Qtr 10/15/2010 <1.0 <1.0 <1.0 <1.0 55 5.8 1st Qtr 2/15/2011 <1.0 <1.0 <1.0 <1.0 60 5.5
2nd Qtr 5/25/2011 <1.0 <1.0 <1.0 <1.0 56 6.4
3rd Qtr 8/16/2011 <1.0 <1.0 <1.0 <1.0 60 5.2
4th Qtr Tiftifirrir 11/15/2011 1 /17/2012
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0 ..f.d. 54 5.0 ......
-2nd Qtr 5/31/2012 <1.0 <1.0 <1.0 <1.0 . ... - -5-9 6.0'
3rd Qtr 8/29/2012 <1.0 <1.0 <1.0 <1.0 60 6.2
4th Qtr 10/3/2012 <1.0 <1.0 <1.0 <1.0 60 5.9
1st Qtr 2/13/2013 <1.0 <1.0 , <1.0 <1.0 59.3 6.31 2nd Qtr 5/29/2013 <1.0 <1.0 <1.0 <1.0 56 6.8
3rd Qtr 8/29/2013 <1.0 <1.0 <1.0 <1.0 63.5 7.16
4th Qtr 11/6/2013 <1.0 <1.0 <1.0 <1.0 58.5 6.48
1st Qtr 1/22/2014 <1.0 <1.0 <1.0 <1.0 63.1 7.09
2nd Qtr 5/21/2014 <1.0 <1.0 <1.0 <1.0 56.1 5.99
3rd Qtr 8/23/2014 <1.0 <1.0 <1.0 <1.0 62 4.8 4th Qtr 10/23/2014 <1.0 <1.0 <1.0 <1.0 66.1 6.28 1st Qtr 3/11/2015 <1.0 <1.0 <1.0 <1.0 66.4 7.09
2nd Qtr 6/10/2015 <1.0 <1.0 <1.0 <1.0 70.3 6.32
3rd Qtr 9/2/2015 <1.0 <1.0 <1.0 <1.0 76.5 5.7
411r Qtr 10/21/2015 <1.0 <1.0 <1.0 <1.0 65.5 5.78
1st Qtr 3/16/2016 <1.0 <1.0 <1.0 <1.0 69.4 7.97 2nd Qtr 5/25/2016 <1.0 <1.0 <1.0 <1.0 71.8 5.87
3rd Qtr 7/28/2016 <1.0 <1.0 <170- <1.0 69.3" 6.14"
4th Qtr 10/19/2016 <1.0 <1.0 <1.0 <1.0 70.9 6.20 ......................... 1st Qtr 3/16/2017 <1.0 <1.0 <1.0 <1.0 66.0 6.05
2nd Qtr 6/15/2017 <1.0 <1.0 <1.0 <1.0 70.4 6.49 3rd Qtr 8/2/2017 <1.0 <1.0 <1.0 <1.0 70.5 6.15
4th Qtr 10i10/2017 <1.0 <1.0 <1.0 <1.0 60.9 6.17
1st Qtr 3/14/2018 <1.0 <1.0 <1.0 <1.0 71.0 5.76
2nd Qtr 6/12/2018 <1.0 <1.0 <1.0 <1.0 65.0 6.24
3rd Qtr 8/29/2018 <1.0 <1,.0, <1.0 <1.0 73.7 5.13 4th Qtr 11/30/2018 <1.0 <1.0 <1.0 <1.0 64.5 5.29
1st Qtr 3/16/2019 <1.0 <1.0 <1.0 <1.0 61.6 5.74
2nd Qtr 6/13/2019 <1.0 <1.0 <1.0 <1.0 65.4 6.56
3rd Qtr 9/11/2019 <1.0 <1.0 <1,,0 <1.0 65.3 5.19
4th Qtr 12/14/2019 <1.0 <1.0 <1.0 <1.0 68.7 5.17
1st Qtr 3/17/2020 <1.0 <1.0 <1.0 <1.0 63.9 5.5 2nd Qtr 6/11/2020 <1.0 <1.0 <1.0 <1.0 62.7 9.0
3rd Qtr 9/17/2020 <1.0 <1.0 <1.0 <1.0 60.2 5.25
4th Qtr 11/4/2020 <1.0 <1.0 <1.0 <1.0 60.6 4.92
1st Otr 3/17/2021 <1.0 <1.0 <1.0 <1.0 67.3 5.57
2nd Qtr 6/15/2021 <1.0 <1.0 <1.0 <1.0 57.7 2.9 3rd Qtr 9/15/2021 <1.0 <1.0 <1.0 <1.0 54.2 4.80
(1) As of March 2012 both north and south wrld life ponds no lonler recervinLwater
NA = not analyzed Shaded indicates concentrations exceeding GWQS.
TABLE 1 (17 of 33)
Historic Summary Of Monitoring Well Analytical Results Up To The 3rd Qarter 2021
Chloroform Contamination Investigation
DUSA White Mesa Mill
TW4-14
Sampling Event
Parameter
(GWQS)
Carbon Tetrachloride
(5 pg/L)
Chloroform
(70 pg/L)
Chloromethane
(30 pg/L)
Methylene Chloride
(5 pg/L)
Chloride
No GWQS (mg/L)
Nitrate, Nitrate + Nitrite
(10 mg/L)
1st Qtr 3/16/2005 NS NS NS NS NS NS
2nd Qtr 5/25/2005 NS NS NS NS NS NS
3rd Qtr 8/31/2005 NS NS NS NS NS NS
4th Qtr 12/7/2005 NS NS NS NS NS NS
1st Qtr 3/9/2006 NS NS NS NS NS NS
2nd Qtr 6/14/2006 NS NS NS NS NS NS
3rd Qtr 7/20/2006 NS NS NS NS NS NS
4th Qtr 11/8/2006 <1.0 NS <1.0 <1.0 37 2.4
1st Qtr 2/26/2007 <1.0 <1.0 <1.0 <1.0 , 38 2.3
2nd Qtr 6/27/2007 <1.0 <1.0 <1.0 <1.0 38 1.4
3rd Qtr 8/15/2007 <1.0 <1.0 <1.0 <1.0 , 36 1.1
4th Qtr 10/10/2007 <1.0 <1.0 <1.0 <1.0 38 0.8
1st Qtr 3/28/2008 <1.0 <1.0 <1.0 , <1.0 57 0.4
2nd 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 Qtr 9/14/2009 <1.0 . <1.0 <1.0 <1.0 38 1.5
4th Qtr 12/16/2009 <1.0 <1.0 <1.0 <1.0 34 1.4 ................. 1st Qtr 3/23/2010 <1.0 <1.0 <1.9 <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
1st Qtr 2/15/2011 <1.0 <,1,.0 <1.0 <1.0 25 1.8
2nd Qtr 6/24/2011 <1.0 <1.0 <1.0 <1.0 24 1.4
3rd Qtr 8/16/2011 <1.0 . , <1.0 <1.0 <1.0 33 2.6
4th Qtr 11/15/2011 <1.0 <1.0 <1.0 <1.0 15 1.7 1ifOir (1I 1/17/2012 <1.0 <1.0 <1.0 <1.0 20 - 1.9
.2nd Qtr . 6/14/2012 <1.0 <1.0 , <1.0 <1.0 35' 3.3'
3rd Qtr 8/29/2012 <1.0 <1.0 <1.0 <1.0 37 3.9
4th Otr 10/3/2012 <1.0 <1.0 <1.0 <1.0 37 3.9
1st Qtr 2/7/2013 <1.0 <1.0 , <1.0 <1.0 35.2 , ,4.6
2nd Qtr 5/29/2013 <1.0 <1.0 <1.0 <1.0 . 38.6 4.4
3rd Qtr 8/29/2013 <1.0 <1.0 <1.0 '1'.i0 ' ' 37.6 , 4.51
4th Qtr 11/6/2013 <1.0 <1.0 <1.0 <1.0 36.5 4.81
1st Qtr 1/22/2014 <1.0 <1.0 <1.0 <1.0 35.5 5.92
2nd Qtr 5/21/2014 <1.0 <1.0 <1.0 <1.0 32.5 4.87
3rd Qtr 8/13/2014 <1.0 <1.0 <1.0 <1.0 38 4.1
4th Qtr 10/23/2014 <1.0 <1.0 <1.0 <1.0 38.9 5.22
1st Qtr 3/12/2015 <1.0 1.7 <1.0 <1.0 , , , 40.1 5.22
2nd Qtr 6/10/2015 <1.0 1.82 <1.0 <1.0 41.8 3.55
3rd Qtr 9/3/2015 <1.0 <1.0 <1.0 <1.0 42.4 2.77
4th Qtr 10/23/2015 <1.0 1.46 <1.0 <1.0 40.6 2.45
1st Qtr 3/16/2016 <1.0 4.49 <1.0 2.18 ' 42.4 2 94
2nd Qtr 5/26/2016 <1.0 6.15 <1.0 , 3.18 . . 43.6 2.45
3rd Qtr 8/3/2016 <1.0 5 <1.0 1.8 42.4 2.88
4th Qtr 10/20/2016 <1.0 7.02 <1.0 1.59 45.6 2.86
1st Qtr 3/15/2017 <1.0 , 6.45 <1.0 2.18 45.4 4.36
2nd Qtr 6/15/2017 <1.0 , 6.85 <1.0 <1.0 46.9 512
3rd Qtr 8/2/2017 <1.0 6.14 <1.0 <1.0 46.4 4.64
4th Qtr 10/10/2017 <1.0 6.13 <1.0 <1.0 42.5 4.73 ............ 1st Qtr 3/15/2018 <1.0 5.8 <1.0 2.18 51.5 5.0
2nd Qtr 6/13/2018 <1.0 5.12 <1.0 <1.0 46.9 6.36
3rd Qtr 8/30/2018 <11.0 . 4.76 <1.0 <1.0 54.1 5.34
4th Qtr 12/12/2018 <1.0 4.41 <1.0 <1.0 48.7 5.85 ............... 1st Qtr 3/16/2019 <1.0 4.08 . „ <1.0 . <1.0 48.7 6.16
2nd Qtr 6/13/2019 <1.0 4.1e <1.0 <1.0 48.3 5.86
3rd Qtr 9/11/2019 <1.0 6.08 <1.0 <'i .0 45.4 4.77
4th Qtr 12/14/2019 <1.0 3.83 <1.0 <1.0 49.4 4.76
1st Qtr 3/17/2020 <1.0 2.98 <1.0 „ <1.0 48.4 6.17
2nd Qtr 6/11/2020 <1.0 2.67 <1.0 <1.0 47.6 6.57
3rd Qtr 9/18/2020 <1.0 2.41 <1.0 <1.0 45.1 5.57
4th Qtr 11/4/2020 <1.0 2.69 <1.0 <1.0 49.7 5.81
1st Qtr 3/18/2021 <1.0 1.77 <1.0 <1.0 48.2 5.56
2nd Qtr 6/16/2021 <1.0 <1.0 <1.0 <1.0 49.5 7.02
3rd Qtr 9/15/2021 <1.0 <1.0 <1.0 <1.0 34.1 5.56
(1) As of March 2012 both north and south wild life ponds no loraer receiving water
NS = not sampled
Shaded indicates concentrations exceeding GWQS.
TABLE 1 (18 of 33)
Historic Summary Of Monitoring Well Analytical Results Up To The 3rd Qarter 2021
Chloroform Contamination Investigation
DUSA White Mesa Mill
TW4-16
Sampling Event
Parameter
(GWQS)
Carbon Tetrachloride
(5 pg/L)
Chloroform
(70 pg/L)
Chloromethane
(30 pg/L)
Methylene Chloride
(5 pg/L)
Chloride
No GWQS (mg/L)
Nitrate, Nitrate + Nitrite
(10 mg/L)
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 l st Qtr 3/9/2006 <1.0 39 1.1 • 21 60 8 2nd Qtr 6/14/2066 <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
4th Qtr 11/8/2006 <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
1st Qtr 3/28/2008 <1.0 11 <1.0 26 52 <0.1
2nd Qtr 6/25/2008 <1.0 <1.0 <1.0 <1.0 58 1.5 3rd Qtr 9/10/2008 <1.0 10 <1.0 14 71 10.5 4th Qtr 10/15/2008 <1.0 3.9 <1.0 6,6 89 9.8 1st Qtr 3/4/2009 <1.0 <1.0 <1.0 73 9.6 <1.0
2nd Qtr 6/23/2009 <1.0 <1.0 <1.0 <1.0 76 8.9
3rd Qtr 9/14/2009 <1.0 <1.0 <1.0 <1.0 79 8.8 4th Qtr 12/17/2009 <1.0 <1.0 <1.0 <1.0 76 5.2 1st Qtr 3/24/2010 <1.0 <1.0 <1.0 <1.0 77 4.2 2nd Qtr 6/14/2010 <1.0 2.1 <1.0 <1.0 64 4.7
3rd Qtr 8/24/2010 <1.0 4.3 <1.0 <1.0 72 4.6
4th Qtr 10/15/2010 <1.0 3 <1.0 <1.0 71 3.3 1st Qtr 2/22/2011 <1.0 15 <1.0 <1.0 86 7 2nd Qtr 5/26/2011 <1.0 16 <1.0 <1.0 81 5
3rd Qtr 8/17/2011 <1.0 9.2 <1.0 <1.0 63 1.7
4th Qtr 11/16/2011 NA NA NA NA 38 0.4
.(1)... 12f7/2011 <1.0 <1.0 <1.0 1.4 NA i'ilOir (3). 1/18/2012 <1.0 <1.0 <1.0 1.7 48 ....0.1 . -2nd Qtr 5/26/2012 <1.0 <1.0 <1.0 ..<1.0 - 53 -.<0.1
3rd Qtr 8/30/2012 <1.0 <1.0 <1.0 <1.0 59 <0.1 4th Qtr 10/3/2012 <1.0 <1.0 <1.0 <1.0 59 <0.1 1st Qtr 2/7/2013 <1.0 <1.0 <1.0 <1.0 58.1 <0.1
2nd Qtr 5/30/2013 <1.0 <1.0 <1.0 4.21 49.8 <0.1
3rd Qtr 9/5/2013 <1.0 <1.0 <1.0 <1.0 54.4 <0.1
4th Qtr 11/7/2013 <1.0 13.4 <1.0 <1.0 56.6 1.37 ............ 1st Qtr 1/29/2014 <1.0 6.93 <1.0 <1.0 66.8 3.16 2nd Qtr 5/22/2014 <1.0 14.6 <1.0 <1.0 80.7 4.94 3rd Qtr (2) 8/14/2014 <1.0 229 <1.0 <1.0 80 5.1
3rd Qtr 9/24/2014 <1.0 371 <1.0 <1.0 NA NA
4th Qtr 10/29/2014 <1.0 387 <1.0 <1.0 92.1 8.4
1st Qtr 3/12/2015 <1.0 153 <1.0 <1.0 65 4.3
2nd Qtr 6/11/2015 <1.0 65.3 <1.0 <1.0 61 1.06 3rd Qtr 9/3/2015 <1.0 82 <1.0 <1.0 65.8 1.18 4th Qtr 10/28/2015 <1.0 112 <1.0 <1.0 58.3 1.69 1st Qtr 3/17/2016 <1.0 45.9 <1.0 <1.0 56.5 1.63
2nd Qtr 5/26/2016 <1.0 93.4 <1.0 <1.0 61.3 1.89
3rd Qtr 8/3/2016 <1.0 49 <1.0 <1.0 60 2.20 4th Qtr 10/26/2016 <1.0 92.9 <1.0 <1.0 66.7 2.78 1st Qtr 3/16/2017 <1.0 19.1 <1.0 <1.0 62.2 2.75 2nd Qtr 6/20/2017 <1.0 64.3 <1.0 <1.0 60.6 1.81
3rd Qtr 8/3/2017 <1.0 143 <1.0 <1.0 67.1 2.63
4th Qtr 10/11/2017 <1.0 98 <1.0 <1.0 54.2 2.12
DWMRC split sareple <0.95 92 <1.5 1.9 J 64 2.00 1st Qtr 3/20/2018 <1.0 170 <1.0 <1.0 85.1 4.55 Duplicate TW4-75 <1.0 171 <1.0 <1.0 84.7 4.51 2nd Qtr 6/14/2018 <1.0 54.5 <1.0 <1.0 62.5 2.83
3rd Qtr 8/30/2018 <1.0 54.5 <1.0 <1.0 73 2.53
4th Qtr 12/12/2018 <1.0 52.0 <1.0 <1.0 68.8 2.88 1st Qtr 3/19/2019 <1.0 60.6 <1.0 <1.0 66.3 3.36 2nd Qtr 6/19/2019 <1.0 76.2 <1.0 <1.0 71.5 2.43 3rd Qtr 9/12/2019 <1.0 99.8 <1.0 <1.0 72.9 3.55 4th Qtr 12/14/2019 <1.0 94.3 <1.0 <1.0 88.6 3.37
qughcate TW4-75 <1.0 91.0 <1.0 <1.0 84.1 3.12
i st Qtr 3/18/2020 <1.0 113 <1.0 <1.0 76.2 3.91 2nd Qtr 6/12/2020 <1.0 141 <1.0 <1.0 79.7 4.44 3rd Qtr 9/19/2020 <1.0 220 <1.0 <1.0 77.4 4.74 41h Qtr 11/11/2020 <1.0 270 <1.0 <1.0 85.9 5.73
Duplicate TW4-75 <1.0 277 <1.0 <1.0 85.6 5.74
DWMRC spht sarh0l0. <10 290 <20 <20 87.0 0.37 I-1 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 s were resamp ed because laboratory missed holding time. (2) VOCs were resampled (3) As of March 2012 both north and south wild life ponds no longer receiving water.
NA = not analyzed
Shaded indicates concentrations exceeding GWOS. J = Approximate value H = Sample was analyzed beyond holding times and may not be accureate concentration.
TABLE 1 (19 of 33)
Historic Summary Of Monitoring Well Analytical Results Up To The 3rd Qarter 2021
Chloroform Contamination Investigation
DUSA White Mesa Mill
TW4-18
Sampling Event
Parameter
(GWQS)
Carbon Tetrachloride
(5 pg/L)
Chloroform
(70 pg/L)
Chloromethane
(30 pg/L)
Methylene Chloride
(5 pg/L)
Chloride
No GWQS (mg/L)
Nitrate, Nitrate + Nitrite
(10 mg/L)
1st Qtr 3/16/2005
2nd Qtr 5/25/2005 3rd Qtr 8/31/2005
4th Qtr 12/7/2005
1st Qtr 3/9/2006
2nd otr 6/14/2006
3rd Qtr 7/20/2006 4th Qtr 11/8/2006
1st Qtr 2/28/2007
2nd Otr 6/27/2007
3rd Qtr 8/15/2007
4th Qtr 10/10/2007 1st Qtr 3/28/2008
2nd Qtr 6/25/2068
3rd Qtr 9/10/2008
4th Qtr 10/15/2008
1st Qtr 3/4/2009
2nd Qtr 6/23/2009
3rd Qtr 9/14/2009
4th Qtr 12/17/2009
1st Qtr 3/24/2010
2nd Qtr 6/14/2010 3rd Qtr 8/12/2010
4th Qtr 10)15/2010
1st Qtr 2/22/2011
2nd Qtr 5/26/2011
3rd Qtr 8/17/2011 4th Qtr 11/16/2011

(t) 12/7/2011 Tiftgr (-2) 1/18/2012 -2nd Qtr 6/13/2012
3r6 Qtr 9/11/2012
4th Qtr 10/3/2012
1st Qtr , 2/13/2013
2nd Qtr 6/13/2013
ard Qtr 9/5/2013
4th Qtr 11/13/2013 1st Qtr 1/30/2014
2nd Qtr 5/22/2014
3rd Qtr 8/14/2014
4th Qtr 10/28/2014
1st Qtr 3/12/2015 2nd Qtr 6/11/2015
3rci Qtr 9/3/2015
4t.qtr...,........ 10/28/2015
ist 'air 3/17/2016
2nd Qtr 6/8/2016 3rd dtr 8/3/2016
4th Qtr 10/26/2016
1st Qtr 3/16/2017
Duplicate TW4-7§
2nd Qtr 6/20/2017
3rd Qtr 8/3/2017 Duplicate TW4-75
4th Qtr 10/11/2017
1st Qtr 3/15/2018
2nd Qtr 6/13/2018
3rd Qtr 8/30/2018 4th Qtr 12/13/2018
1st Qtr 3/19/2019
2nd Qtr 6/19/2019
Duplicate TW4-75
3rd Qtr ., , 9/11/2019
4th Qtr 12/18/2019 1st Qtr 3/18/2020
2nd Qtr 6/12/2020
3rd Qtr 9/18/2020
4th Qtr 11/11/2020
DWMRC split sampls
1st Qtr 3/18/2021
2nd Qtr 6/16/2021 3rd Qtr 9/22/2021
NA
NA <1.0 <1.0
<1.0
<1.0
<1.0 <1.0
<1.0
<1.0
<1.0
<1.0 <1.0
<1.0
<1.0
<1.0
<1.0 <1.0
<1.0
<1.0
<1.0
<1.0 <1.0
<1.0
<1.0
<1.0
<1.0 NA <1.0 <1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0 <1.0
<1.0
<1.0
<1.0
<1.0 <1.0
<1.0
<1.0
<1.0
<1.0 <1.0 <1.0
<1.0
<1.0
<1.0
<1.0 <1.0
<1.0
<1.0
<1.0
<1.0 <1.0
<1.0
<1.0
<1.0
<1.0
<1.0 <1.0
<1.0
<1.0
<1.0
<10
<1.0
<1.0 <1.0
NA
, 38
29.8 39
14
12
, 12
10.8 12.5
9.2
8
8.9
7.4
6.4
5.7
8
9.4
11 16
13
8.2
69
29 29
30
39
26
29
28
24 38 30
34.9
37.9
41
44.3 6.93
6.93
32.8
33
32 30.5
28.7
52.9
, 56.6
60
56.3 60.1
62
61.5
63.8
62.8 62.3
62.9
62.3
59.9
56.2 57.6
52.8
54.2
54.4
56.2
62.0
, 57.0
58.2 . . 60.0
58.6
56.0
52.0
58.2 49.9
25
NA
NA
<1.0 <1.0
<1.0
<1.0 , <1.0
<1.0 <1.0
<1.0
<1.0
<1.0
<1.0 <1.0
<1.0
<1.0
<1.0
<1.0 <1.0
<1.0
<1.0
<1.0
<1.0 NA <1.0 <1.0
<1.0
<1.0 <1.0
<1.0
<1.0
<1.0
<1.0 <1.0
<1.0
<1.0 . <1.0
<1.0 <1.0
<1.0
<1.0
<1.0
<1.0 <1.0 <1.0
<1.0
<1.0
<1.0
<1.0 <1.0
<1.0
<1.0
<1.0
<1.0 <1.0
<1.0
<1.0
<1.0
<1.0
<1.0 <1.0
<1.0 .. <1.0
<1.0
<20
<1.0
<1.0 <1.0
2.8
1.1
1.6
2.7
NA
NA <1.0
<1.0
<1.0
<1.0
<1.0 <1.0
<1.0
<1.0
<1.0
<1.0 <1.0
<1.0
<1.0
<1.0
<1.0 <1.0
<1.0
<1.0
<1.0
<1.0 <1.0
<1.0
<1.0
<1.0
<1.0 NA <1.0 <1.0

_ <1.0 <1.0 <1.0
<1.0
<1.0
<1.0
<1.0 <1.0
<1.0
<1.0
<1.0
<1.0 <1.6
<1.0
<1.0
<1.0
<1.0
<1.0 <1.0
<1.0
<1.0
<1.0
<1.0 <1.0
<1.0
<1.0
<1.0
<1.0
<1.0 <1.0
<1.0
<1.0
<1.0

. „ <1.0 <1.0 <1.0
<1,0
<1.0
<20
<1.0
<1.0 <1.0
NA
NA NA
41
36
35
35 34
30
28
32
27 23
23
26 30
29, 30
26
30
41
35 37
50
52
36
23
23 NA 18
30
26 27
23.1
22.9
36.2
37.1 38.9
47
49
40.8
, 41.6
43.5 47.6
40.7
43.8
40.7 43.9
39.4
41.1
41.6
40.4
41.5 37.1
44.3,
39.5
45.6
38.2
37.6
39.5
40.8
36.8
42.7
39.4 41.4
38.7
39.6
41.0
41.8
41.4 29.8
NA
14.1
12.9 13.3
7.3
5.9
4.7
6.1 5.7
5.1
4.9
5.0
4.4
0.7
4.6
4.9
5.2
5.2 6.2
,5.9
5.4
5.1
9.0 9.0
10.0 ................ 10.6
9.0
4,6
6.3
4.4
6.
6.6 6.0 5.6
8.9
12.1
14.2 12.8 12.2
9.8
11.1 ..1-1J
9.69 15.7
39.4 6.24
5.96
5.45
5.79 5.24
4.47
4.41
4.50
4.24
4.31
............ 44.
.34
4.09
3.51
3.60 3.85
4.01
2.95
3.25
3.02 ..._......... 3.71 3.62
3.36
3.67
3.30
3.61
3.62
3.37
(1) vocs were resampled because laboratory missed holding t me. (2) As of March 2012 both north and south wild life ponds no longer receiving water.
NA = not analyzed Shaded indicates concentrations exceeding GWOS.
TABLE 1 (20 of 33)
Historic Summary Of Monitoring Well Analytical Results Up To The 3rd Qarter 2021
Chloroform Contamination Investigation
DUSA White Mesa Mill
TW4-19 (chlorofrom pumping well
started 4130103)
Sampling Event
Parameter
(GWQS)
Carbon Tetrachloride
(5 pg/L)
Chloroform
(70 pg/L)
Chloromethane
(30 pg/L)
Methylene Chloride
(5 pg/L)
Chloride
No GWQS (mg/L)
Nitrate, Nitrate + Nitrite
(10 mg/L)
1st Qtr 3/16/2005 NA 2,200 NA NA NA 5.3
2nd Qtr 5/25/2005 NA 1,200 NA NA NA 5.7
3rd Qtr 8/31/2005 <5.0 1,400 <5.0 <5.0 NA 4.6
4th Qtr 12/7/2005 <50 2,800 <50 <50 81 <0.1
1st Qtr 3/9/2006 <50 1,200 <50 <50 86 4
2nd Qtr 6/14/2006 <50 1,100 <50 <50 116 5.2
3rd Qtr 7/20/2006 <50 1,120 <50 . . <50 123 4.3
4th Qtr 11/8/2006 1.6 1 050 2.6 <1.0 134 ....4,6
1st Qtr 2/28/2007 1.3 1,200 <1.0 <1.0 133, 4
2nd Qtr 6/27/2007 Did not sample
3rd Qtr 8/15/2007 1.9 1 100 , , <1.0 <1.0 129 4.1
4th Qtr 10/10/2007 1.9 1 100 <1.0 <1.0 132 4
1st Qtr 3/28/2008 2.9 1,800 <1.0 <1.0 131 2.2
2nd Qtr 6/25/2008 <1.0 1,000 <1.0 <1.0 128 2.8
3rd Qtr 9/10/2008 8.6 3,600 <1.0 <1.0 113 35.2
4th Qtr 10/15/2008 12 4 200 <1.0 <1.0 124 47.8
1st Qtr 3/4/2009 1.2 .1,100 <1.0 <1.0 127 3.2
2nd Qtr 6/23/2009 1.2 990 <1.0 <1.0 132 2.4
3rd Qtr 9/14/2009 15 6,600 <1.0 <1.0 43 <0.1
4th Qtr 12/22/2009 16 4 700 <1.0 <1.0 124 26.7
1st Qtr 2/17/2010 1.3 940 <1.0 <1.0 144 2
2nd Qtr 6/14/2010 4.2 1,800 <1.0 <1.0 132 4.4
3rd Qtr 8/16/2010 4.9 2000, <1.0 <1.0 142 5.9
4th Qtr 10/15/2010 1.3 1 200 <1.0 <1.0 146 2.7
1st Qtr 2/17/2011 17 3,400 <1.0 <1.0 135 17.0
2nd Qtr 6/7/2011 8.3 4,000 <1.0 <1.0 148 12.0
3rd Qtr 8/17/2011 2.1 970 <1.0 <1.0 148 3.0
4th Qtr 11/16/2011 148 5.0
VI 12/5/2011 5.4 2„200 <1.0 <1.0 lira (2) 1/23/2012 1.5 -- 660 _ <1.0 <1.0 138 ---b: -2nd Qtr 6/6/2012 1.1 460 <1 0 <1.0 149 2.4
3rd Qtr 9/4/2012 3.5 950 <1.0 <1.0 149 2.5
4th Qtr 10/3/2012 4 1500 <1.0 <1.0 150 4.1
1st Qtr 2/13/2013 5.15 4,210 <1.0 <1.0 164 8.0
2nd Qtr 6/5/2013 5.15 2,070 <1.0 <1.0 148 3.0
3rd Qtr 9/3/2013 20.7 8,100 <1.0 <1.0 179 17.6
4th Qtr 10/29/2013 6.42 942 <1.0 <1.0 134 4.7
1st Qtr 1/27/2014 4.05 586 <1.0 <1.0 134 1.6
2nd Qtr 5/19/2014 5.51 810 <1.0 <1.0 152 1.3
3rd Qtr 8/11/2014 1.9 1,410 8.3 <1.0 140 1.6
4th Qtr 10/21/2014 4.8 4 310 <1.0 <1.0 130 4.7
1st Qtr 3/9/2015 8.92 4,660 <1.0 <1.0 238 8.56
2nd Qtr 6/8/2015 2.62 1,570 <1.0 <1.0 180 0.916
3rd Qtr 8/31/2015 <1.0 7,860 7.78 <1.0 326 11.6
4th Qtr 10/19/2015 12.2 7 840 5.46 <1.0 252 10.6
1st Qtr 3/9/2016 13.5 7,780 1.4 <1.0 276 15.70
2nd Qtr 5/26/2016 23.1 12,600 <1.0 <1.0 204 1.27
3rd Qtr 7/25/2016 9.89 6,040 <1.0 <1.0 214 10.5
4th Qtr 10/13/2016 10.8 6 640 <1.0 <1.0 200 10.0
1st Qtr 3/8/2017 3.06 1,240 <1.0 <1.0 461 11.1
2nd Qtr 6/13/2017 1.35 510 <1.0 <1.0 135 0.243
3rd Qtr 7/26/2017 13.0 8,840 <1.0 <1.0 218 1.120
4th Qtr 10/11/2017 <1.0 129 <1.0 <1.0 139 0.377 ............. 1st Qtr 3/12/2018 1.36 2,640 <1.0 <1.0 193 86
2nd Qtr 6/8/2018 3.45 2,980 <1.0 <1.0 138 0.494
3rd Qtr 8/30/2018 2.03 1,910 <1.0 <1.0 166 2.55
4th Qtr 11/28/2018 6.18 5 270 <1.0 <1.0 140 0.233
1st Qtr 3/8/2019 2.43 2,050 <1.0 <1.0 197 6.58
2nd Qtr 6/5/2019 15.9 11,500 <1.0 <1.0 160 8.96
3rd Qtr 9/4/2019 10.1 6,670 <1.0 <1.0 153 0.33
4th Qtr l st Qtr
12/10/2019
2/19/2020
<1 0 13.7 551 8,720
<1.0
5.41
<1.0
<1.0 ...1.47, 205 .0.:5 .5. 10.1
2nd Qtr 5/27/2020 10.4 7,600 <1.0 <1.0 147 1.14
3rd Qtr 9/4/2020 1.98 1,350 <1.0 <1.0 188 11.6
4th Qtr 10/28/2020 1.1 660 <1.0 <1.0 104 1.1
1st Qtr 2/23/2021 8.4 6,660 5.41 <1.0 167 6.6
2nd Qtr 6/9/2021 <1.0 775 <1.0 <1.0 115 4.04
3rd Qtr 8/24/2021 7.83 4,450 1.98 1.25 172 6.68
(1) VOCs were resampled because laboratory missed holding t me. (2) As of March 2012 both north and south wild life ponds no longer receiving water.
NA = not analyzed
Bold and italics indicates the MDL exceeded the GWQS. Shaded indicates concentrations exceeding GWQS.
TABLE 1 (21 of 33)
Historic Summary Of Monitoring Well Analytical Results Up To The 3rd Qarter 2021
Chloroform Contamination Investigation
DUSA White Mesa Mill
TW4-20 (chloroform pumping well
started 8/4/05) Sampling Event
Parameter
(GWQS)
Carbon Tetrachloride
(5 pg/L)
Chloroform
(70 pg/L)
Chloromethane
(30 pg/L)
Methylene Chloride
(5 pg/L)
Chloride
No GWQS (mg/L)
Nitrate, Nitrate + Nitrite
(10 mg/L)
ist Otr 3/16/2005 Monitor well was not installed 2nd Qtr (3) 5/25/2005 NA 39,000 NA NA NA 10.10 ..3rd Qtr 8/31/2005 <10 3,800 <10 <10 NA 2.96
41h Qtr 12/7/2005 <250 19,000 <250 <250 131 1.80
1st Qtr 3/9/2006 <500 9,200 <500 <500 120 3.80
2nd Qtr 6/14/2006 <500 61,000 <500 <500 235 9.40
3rd Qtr 7/20/2006 <1000 5,300 <1000 <1000 134 2.90
4th Qtr 11/8/2006 7.1 11 000 1.9 2.2 124 3.50
1st Qtr 2/28/2007 3.1 4,400 <1.0 1.1 124 4.20
2nd Qtr 6/27/2007 2.2 1,800 <1.0 <1.0 112 2.30
3rd Qtr 8/15/2007 3.5 5,200 <1.0 1.8 117 2.10
4th Qtr 10/10/2007 6.8 9,000 <1.0 1.9 170 5.60
1st Qtr 3/28/2008 9 13,000 <1.0 1.5 132 0.90
2nd Qtr 6/25/2008 13 30,000 <1.0 1.2 191 8.00
3rd Qtr 9/10/2008 15 21,000 <1.0 3.7 156 4.44
4th Qtr 10/15/2008 NA NA NA NA 168 5.51
1st Qtr 3/4/2009 5.7 8,200 <1.0 5.2 164 5.10
2nd Qtr 6/23/2009 4.9 6,800 <1.0 4.2 164 2.90
3rd Qtr 9/14/2009 8.4 13,000 <1.0 4.4 153 3.30
4th Qtr 12/22/2009 14 15,000 <1.0 3.0 187 5.30
1st Qtr 2/17/2010 2.7 3,500 <1.0 3.2 179 2.00
2nd Qtr 6/14/2010 11 18,000 <1.0 3.7 200 5.60
3rd Qtr 8/16/2010 12 15,000 <1.0 2.2 196 5.30
4th Qtr 10/15/2010 20 qicpoo <to 5.5 203 4.60 ................ 1st Qtr 2/17/2011 27 31,000 <1.0 19.0 220 4.40
2nd Qtr 6f7/2011 10 8,100 <1.0 2.1 177 4.80
3rd Qtr 8/17/2011 7.3 3,800 <1.0 3.1 207 6.50
4th Qtr 11/16/2011 7.2 7,900 <1.0 2.5 186 4.29 lifair ay 1Q3/2012 10 fi,5bo <1.0 1.3 207 -T6ti
-2nd Qtr 6/6/2012 33 36,000 <1.0 <1.0 262 11.00
3rd Qtr 9/4/2012 26 13,000 <1.0 <1.0 289 10.80
4th Qtr 10/3/2012 22 19,000 <1.0 <1.0 302 11.00
1st Qtr 2/11/2013 19.6 16:500 <1.0 1.21 252 9.07
2nd Qtr 6/5/2013 32.5 26,300 <1.0 1.3 250 9.80
3rd Qtr 9/3/2013 25.7 26,800 <1.0 2;14 260 8.65
4th Qtr 10/29/2013 17.3 15,700 <1.0 1.37 272 9.64
1st Qtr 1/27/2014 184 17,800 <1.0 2.04 254 7.56
2nd Qtr 5/19/2014 22.1 22,100 2.31 3.98 269 5.95
3rd Qtr 8/11/2014 14.1 12,400 55.2 2.2 299 4.30
41h Qtr 10/21/2014 18.5 23 300 4.04 2.38 292 7.67
1st Qtr 3/9/2015 20.8 19,900 4.85 1.38 290 9.80
2nd Qtr 6/8/2015 16.2 17,600 13.4 1.73 296 5.76
3rd Qtr 8/31/2015 15.1 17,000 12.3 <1.0 365 9.3
4th Qtr 10/19/2015 14.5 17,000 10 8 1 293 6.23
1st Qtr 3/9/2016 20.2 21,600 4.09 1.16 293 10.30
2nd Qtr 5/23/2616 40.6 33,700 <1.0 <1.0 318 11.2
3rd Qtr 7/25/2016 26.6 23,600 <1.0 <1.0 307 11.3
4th Qtr 10/12/2016 24.4 21,300 <1.0 <1.0 301 11.4
1st Qtr 3/8/2017 23.5 23,400 <1.0 <1.0 290 12.0
2nd Qtr 6/13/2017 23.4 18,100 <1.0 <1.0 281 9.76
3rd Qtr 7/26/2017 25.0 27,600 1.25 <1.0 292 10.8
4th Qtr 10/12/2017 11.2 11,600 2.34 <1.0 293 8.91
1st Qtr 3/12/2018 15.9 15,400 1.77 2.36 289 9.5
2nd Qtr 6/14/2018 <1.0 12,000 <1.0 7.77 258 10.40
3r8 Qtr 8/22/2018 9.85 10,500 4.98 <1.0 282 8.14
4th Qtr 11/28/2018 8.32 9,500 15.6 <1.0 295 9.72
1st Qtr 3/8/2019 15.4 15,600 <1.0 <1.0 272 6.7
2nd Qtr 6/5/2019 10.1 13,700 <1.0 <1.0 279 9.59
3rd Qtr 9/4/2019 8.39 10,500 <1.0 <1.0 286 10.20
4th Qtr 12/10/2019 5.92 8,790 2.67 <1.0 307 9.75
1st Qtr 2/19/2020 8.6 14,300 10.7 <1.0 310 9.81
2nd Qtr 5/27/2020 6.74 5,800 1.3 12.3 3.01 7.23
Well TW4-20 Abandoned in October 2020
(1) VOCs were resampled because laboratory missed holding time. (2) As of March 2012 both north and south wild life ponds no longer receiving water.
(3) Chloroform pumpam well started 8/4/05.
NA = not analyzed Bold and italics indicates the MDL exceeded the GWQS. Shaded indicates concentrations exceeding GWQS.
TABLE 1 (22 of 33)
Historic Summary Of Monitoring Well Analytical Results Up To The 3rd Qarter 2021
Chloroform Contamination investigation
DUSA White Mesa Mill
TW4-21 (chloroform pumping well 6/9/15)
Sampling Event
Parameter
(GWQS)
Carbon Tetrachloride
(5 pg/L)
Chloroform
(70 pg/L)
Chloromethane
(30 pg/L)
Methylene Chloride
(5 pg/L)
Chloride
No GWQS (mg/L)
Nitrate, Nitrate + Nitrite
(10 mg/L) 1st Qtr 3/16/2005
2nd Qtr 5/25/2005 3rd Qtr 8/31/2005 4th Qtr 12/7/2005
1st Qtr 3/9/2006
2nd Qtr 6/14/2006
3rd Qtr 7/20/2006 4th Qtr 11/8/2006 1st Qtr 2/28/2007
2nd Qtr 6/27/2007
3rd Qtr 8/15/2007
4th Qtr 10/10/2007 1st Qtr 3/28/2008 2nd Qtr 6/25/2008
3rd Qtr 9/10/2008
4th Qtr 10/15/2008
11/18/2008
1st Qtr 3/11/2009 2nd Qtr 6/23/2009 3rd Qtr 9/14/2009
4th Qtr 12/22/2009
1st Qtr 2/25/2010 2nd Qtr 6/14/2010 3rd Qtr 8/13/2010
4th Qtr 10/15/2010
1st Qtr 2/22/2011
2nd Qtr 6/28/2011 3rd Qtr 8/17/2011
4th Qtr 11/16/2011
.(1) 12/7/2011 iifOir (2) 1/23/2012 -2nd Qtr 6/6/2012 3rd Qtr 9/4/2012 4th Qtr 10/3/2012
1st Qtr 2/11/2013
2nd Qtr 6/5/2013
3rd Qtr 9/3/2013 4th Qtr 10/29/2013
1st Qtr 1/27/2014 2nd Qtr 5/19/2014
3rd Qtr 8/11/2014
4th Qtr 10/21/2014 1st Qtr 3/9/2015 2nd Qtr (3) 6/8/2015
1rd Qtr 8/31/2015 4th Qtr 10/19/2015 1st Qtr 3/9/2016
2nd Qtr 5/23/2016
3rd Qtr 7/25/2016
4th Qtr 10/12/2016
1st Qtr 3/8/2017 2nd Qtr 6/13/2017 3rd Qtr 7/26/2017 4th Qtr 10/11/2017
DWMIRC atlit sample
1st Qtr 3/12/2018
2nd Qtr 3rd Qtr 8/22/2018 4th Qtr 10/22/2018 1st Qtr 3/8/2019
2nd Qtr 6/5/2019
3rd Qtr 9/4/2019
4th Qtr 12/10/2019
1st Qtr 2/19/2020 2nd Qtr 5/27/2020 3rd Qtr 9/4/2020
4th Qtr 10/28/2020
1st Qtr 2/23/2021
2nd Qtr 6/9/2021
3rd Qtr 8/24/2021
NA <5.0 <1.0
<2.5
<2.5
<2.5
<1.0
<1.0
NA
<1.0 <1.0
<1.0
<1.0
<1.0 <1.0
<1.0
<1.0
<1.0 <1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<3.8
<1.0 <1.0 <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 1.8
5.8
7
1.7
1.6
2
9.2
1.2
4.8 6.3
6.7 6.4
5.4
6
7
5.25
3.49
2.13
6.23
4.73
1.04
1.75 1.92
2.36
1.16
1.05
2.36
1.2
#N/A
192
78
86
120
120 108
139
160
300
140 120
390
180
120
170
180
200
200

160 170
210
390
200
230 290 460
390

420
400
410
390
282
328 244
204
220
240
204 229
292 366
281

339
390
545
456
456 598
224
537
466
400 421 532
476
585
323
734
596 794 844
767
920
948 400
1,130 669
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 <1.0
<1.0
<1.0 <1.0
<1.0 <1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0 <1.0
<1.0
<1.0
<1.0
<6.0 <1.0 <1.0
<1.0 <1.0
<1.0
<1.0
<1.0 <1.0
<1.0
<1.0
<1.0 <1.0
<1.0 <1.0
Monitor
2.58
well was not installed 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
NA
NA
NA
353
347
318
357
296
306
327
300
288
331
271 244
284
279
291
281
228
266
278
303
290
287
287
228
285
142
270
221 243
207
206
200
243 230
252
255
494
499
452
425 457 439
452
309
447
378 310 447
387
182
392
180 456
478
339
446
353
382 411
454
461 375
256
210
413
#N/A
14.6
10.1 9.6 8.5
10.2
09
8.7 ............... 8.7
8.6
8.6
8.3
14.3
8.8
7.57
8.0
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.d
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 s were resampled because laboratory missed holding t•me. (2) As of March 2012 both north and south wild life ponds no longer receiwng water. -(T Oa-FM pumping well started 6/9/15. -NW n7it analyzed Shaded indicates concentrations exceeding GWQS. J = Approximated value
TABLE 1 (23 of 33)
Historic Summary Of Monitoring Well Analytical Results Up To The 3rd Qarter 2021
Chloroform Contamination Investigation
DUSA White Mesa Mill
TW4-22
(nitrate pumping well started 1/26/13)
Sampling Event
Parameter
(GWQS)
Carbon Tetrachloride
(5 pg/L)
Chloroform
(70 pg/L)
Chloromethane
(30 pg/L)
Methylene Chloride
(5 pg/L)
Chloride
No GWQS (mg/L)
Nitrate, Nitrate + Nitrite
(10 mg/L)
1st Qtr 3/16/2005 Monitor well was not installed
2nd Qtr 5/25/2005 NA 340 NA NA NA 18.2
3rd Qtr 8/31/2005 <5.0 290 <5.0 <5.0 NA 15.7
4th Qtr 12/7/2005 <5.0 320 <5.0 <5.0 253 15.1
1st Qtr 3/9/2006 00 390 <10 <10 236 15.3
2nd Qtr 6/14/2006 410 280 <10 00 221 14.3
3rd Qtr 7/20/2006 410 864 <10 <10 221 14.5
4th Qtr 11/8/2006 <1.0 350 1.6 <1.0 236 .... 15.9 .................. 1st Qtr 2/28/2007 <1.0 440 <1.0 <1.0 347 20.9
2nd Qtr 6/27/2007 <1.0 740 <1.0 <1.0 273 19.3
3rd Qtr 8/15/2007 <1.0 530 <1.0 <1.0 259 19.3
4th Qtr 10/10/2007 <1.0 440 <1.0 <1.0 238 18.8
1st Qtr 3/28/2008 <1.0 1,400 <1.0 <1.0 519 39.1
2nd Qtr 6/25/2008 <1.0 1,200 <1.0 <1.0 271 41.9
3rd Qtr 9/10/2008 1.3 6,300 <1.0 <1.0 524 38.7
4th Qtr 10/15/2008 NA #N/A NA NA 539 36.3
11/18/2008 <2.0 630 <2.0 <2.0 NA #N/A
1st Qtr 3/11/2009 <1.0 390 <1.0 <1.0 177 20.7
2nd Qtr 6/23/2009 <1.0 730 <1.0 <1.0 177 20.6
3rd Qtr 9/14/2009 <1.0 2,300 <1.0 <1.0 391 40.3
4th Qtr 12/29/2009 <1.0 380 <1.0 <1.0 175 17.8
1st Qtr 3/23/2010 <1.0 2,200 <1.0 <1.0 427 36.8
2nd Qtr 6/14/2010 <1.0 540 <1.0 <1.0 134 19.0
3rd Qtr 8/24/2010 <1.0 340 <1.0 <1.0 130 15.0
4th Qtr 10/15/2010 <1.0 340 <1.0 <1.0 134 16.0
ist Qtr 2/22/2011 1.2 1,300 <1.0 <1.0 114 18.0
2nd Qtr 6/1/2011 <1.0 210 <1.0 <1.0 138 17.0
3rd Qtr 8/17/2011 <1.0 450 <1.0 <1.0 120 15.0
4th Qtr 11/16/2011 NA #N/A NA NA 174 19.0
(1) 12/7/2011 <1.0 400 <1.0 <1.0 NA #N/A lif.aiFf2r -171.912042-1.0 200 <1.0 <1.0 36 _. ___ 14.0 -2nd Qtr 6/13/2012 <1.0 120 <1.0 <1.0 35 12.6
3rd Qtr 9/12/2012 <1.0 121 <1.0 <1.0 7.0
4th Qtr 10/4/2012 <1.0 330 <1.0 <1- 0 - 130 14.0 -1st Qtr (3) 2/11/2013 3.24 10,600 <1.0 <1.0 130 58.0
2nd Qtr 6/5/2013 3.35 12,500 <1.0 <1.0 586 50.2
3rd Qtr 9/3/2013 3.25 9,640 <1.0 <1.0 487 29.7
4th Qtr 10/29/2013 8.09 13,300 <1.0 <1.0 501 45.2
1st Qtr 1/27/2014 6.06 12,100 <1.0 2.83 598 54.6
2nd Qtr 5/19/2014 6.65 12,400 <1.0 <1.0 614 47.2
3rd Qtr 8/11/2014 1.9 12,400 40 <1.0 540 41.5
4th Qtr 10/29/2014 3.32 12,400 1.61 <1.0 596 54.9
1st Qtr 3/9/2015 3.77 12,700 4.31 <1.0 675 69.2
2nd Qtr 6/8/2015 2.42 8,050 3.42 <1.0 390 47.1
3rd Qtr 8/31/2015 <1.0 7,810 5.47 <1.0 557 64.7
4th Qtr 10/19/2015 3 32 7 530 5 1 <1 0 567 56 1
1st Qtr 3/9/2016 <1.0 6,070 <1.0 <1.0 583 31.1
2nd Qtr 5/23/2016 2.64 8 570 <1.0 <1.0 598 58.4
3rd Qtr 7/25/2016 <1.0 5,840 <1.0 <1.0 619 61.3
4th Qtr 10/12/2016 1.08 3,370 <1.0 <1.0 588 61.5 ............. 1st Qtr 3/8/2017 1.56 5,320 <1.0 <1.0 566 69.8
2nd Qtr 6/13/2017 1.21 3,670 <1.0 <1.0 572 70.8
3rd Qtr 7/26/2017 <1.0 5,150 <1.0 <1.0 391 66.1
4th Qtr 10/11/2017 <1.0 4,770 <1.0 <1.0 600 80.1
DWMRCAllit.sor:ople <38 4 100 <60 150 J 610 79.0
1st Qtr 3/12/2018 <1.0 4,530 <1.0 <1.0 607 62.3
2nd Qtr 6/8/2018 <1.0 3,010 <1.0 <1.0 580 72.5
3rd Qtr 8/22/2018 <1.0 3,600 <1.0 <1.0 613 55.4
4th Qtr 11/28/2018 <1.0 2 680 <1.0 <1.0 567 75.7
1st Qtr 3/8/2019 1.02 4,310 <1.0 <1.0 528 71.9
2nd Qtr 6/5/2019 1.13 4,690 <1.0 <1.0 662 83.9
3rd Qtr 9/4/2019 <1.0 3,460 <1.0 <1.0 588 72.5
4th Qtr 12/10/2019 <1.0 3 20 ..,8 <1.0 <1.0 608 59.9
1st Qtr 2/19/2020 1.02 3,910 <1.0 <1.0 606 57.7
2nd Qtr 5/27/2020 <1.0 2,530 <1.0 <1.0 578 60.5
3rd Qtr 9/4/2020 <1.0 3,760 <1.0 <1.0 514 64.8
4th Qtr 10/28/2020 6.83 3,640 <1.0 <1.0 523 64.9
1st Qtr 2/23/2021 <1.0 5,100 <1.0 <1.0 618 69.6
2nd Qtr 6/9/2021 <1.0 4,520 <1.0 <1.0 408 89.3
3rd Qtr 8/24/2021 <1.0 3,510 <1.0 <1.0 410 35.1
(1) VOCs were resampled because laboratory missed holding time. (2) As of March 2012 both north and south wild life ponds no longer receiving water.
(3) Chloroform pumping well started 1/26/13.
NA = not analyzed Shaded indicates concentrations exceeding GWQS. Bold and italics indicates the MDL exceeded the GWQS. J = Approximated value
TABLE 1 (24 of 33)
Historic Summary Of Monitoring Well Analytical Results Up To The 3rd Qarter 2021
Chloroform Contamination Investigation
DUSA White Mesa Mill
TW4-23
Sampling Event
Parameter
(GWQS) Carbon Tetrachloride
(5 pg/L)
Chloroform
(70 pg/L)
Chloromethane
(30 pg/L)
Methylene Chloride
(5 pg/L)
Chloride
No GWQS (mg/L)
Nitrate, Nitrate + Nitrite
(10 mg/L) 2nd Qtr 6/27/2007 <1.0 <1.0 <1.0 <1.0 47 <0.1
3rd Qtr 8/15/2007 <1.0 <1.0 <1.0 <1 0 46 <0.1
4th Qtr 10/10/2007 <1.0 <1.0 <1.0 <1.0 43 <0.1 1st Qtr 3/28/2008 <1.0 <1.0 <1.0 <1.0 41 <0.1 2nd Qtr 6/25/2008 <1.0 <1.0 <1.0 <1.0 41 <0.1 3rd Qtr 9/10/2008 <1.0 <1:0 <1.0 <1.0 35 <0.05
4th Qtr 10/15/2008 NA NA NA NA 51 <0.05
11/18/2008 <2.0 <2.0 <2.0 <2.0 NA NA 1st Qtr 3/4/2009 <1.0 <1.0 <1.0 <1.0 41 <0.1 2nd Qtr 6/23/2009 <1.0 <1.0 <1.0 <1.0 43 <0.1
3rd Qtr 9/14/2009 <1.0 <1.0 <1.0 <1.0 43 <0.1
4th Qtr 12/16/2009 <1.0 <1.0 <1.0 <1.0 37 <0.1 1st Qtr 3/24/2010 <1.0 <1.0 <1.0 <1.0 45 <0.1 2nd Qtr 6/14/2010 <1.0 <1.0 <1.0 <1.0 40 <0.1 3rd Qtr 8/24/2010 <1.0 <1.0 <1.0 <1.0 40 <0.1
4th Qtr 10/15/2010 <1.0 <1.0 <1.0 <1.0 .............. 34 ............................... <0.1
1st Qtr 2/16/2011 <1.0 <1.0 <1.0 <1.0 44 <0.1 2nd Qtr 6/14/2011 <1.0 <1.0 <1.0 <1.0 44 <0.1 3rd Qtr 8/16/2011 <1.0 <1.0 <1.0 <1.0 41 <0.1 41h Qtr 11/15/2011 <1.0 <1.0 <1.0 <1.0 43 <0.1 afF(I) 1/17/2012 <1.0 <1.0 <1.0 <1.0 .- 40 <0.1 . 2nd Qtr 5/31/2012 <1.0 <1.0 <1.0 <1.0 44 <.1 3rd Qtr 8/29/2012 <1.0 <1.0 <1.0 <1.0 46 <0.1
4th Qtr 10/3/2012 <1.0 <1.0 <1.0 <1.0 45 <0.1
1st Qtr 2/7/2013 <1.0 <1.0 <1.0 <1.0 43.6 <0.1
2nd Qtr 5/30/2013 <1.0 <1.0 <1.0 <1.0 44.7 0.1 3rd Qtr 9/5/2013 <1.0 <1.0 <1.0 <1.0 48 <0.1 4th Qtr 11/7/2013 <1.0 <1.0 <1.0 <1.0 43 <0.1
1st Qtr 1/23/2014 <1.0 <1.0 <1.0 <1.0 44.6 <0.1
2nd Qtr 5/19/2014 <1.0 <1.0 <1.0 <1.0 42.3 <0.1
3rd Qtr 8/13/2014 <1.0 <1.0 <1.0 <1.0 46 <0.1 4th Qtr 10/28/2014 <1.0 <1.0 <1.0 <1 0 . 46.8 <0.1 1st Qtr 3/12/2015 <1.0 <1.0 <1.0 <1.0 47.3 <0.1 2nd Qtr 6/8/2015 <1.0 <1.0 <1.0 <1.0 48.4 <0.1 3rd Qtr 9/3/2015 <1.0 <1.0 <1.0 <1.0 54.1 <0.1
4th Qtr 10/28/2015 <1.0 <1.0 <1.0 <1.0 46.4 <0.1
Duklcate TW4-70 <1.0 <1.0 <1.0 <1.0 46.4 <0.1 1st Qtr 3/16/2016 <1.0 <1.0 <1.0 <1.0 49.1 <0.1 2nd Qtr 5/26/2016 <1.0 <1.0 <1.0 <1.0 50.4 <0.1 3rd Qtr 8/23/2016 <1.0 <1.0 <1.0 <1.0 49.6 <0.1
Duplicate TW4-70 <1.0 <1.0 <1.0 <1.0 48.3 <0.1
4th Qtr 10/12/2016 <1.0 <1.0 <1.0 <1.0 52.1 <0.1
1st Qtr 3/15/2017 <1.0 <1.0 <1.0 <1.0 47.7 <0.1
Duplicate TW4-70 <1.0 <1.0 <1.0 <1.0 . 49.8 <0.1 2nd Qtr 6/15/2017 <1.0 <1.0 <1.0 <1.0 51.5 <0.1
3rd Qtr 8/2/2017 <1.0 <1.0 <1.0 <1.0 51.8 <0.1
41h Qtr 10/10/2017 <1.0 <1.0 <2.0 <2.0 44.7 <0.1
DWMRC sptit sarnbl <1.0 <1.0 <2.0 <2.0 52 <0.1 1st Qtr 3/14/2018 <1.0 <1.0 <1.0 <1.0 53.8 <0.1 2nd Qtr 6/13/2018 <1.0 <1.0 <1.0 <1.0 47.6 <0.1
Duplicate TW4-70 <1.0 <1.0 <1.0 <1.0 47.9 <0.1
3rd Qtr 8/30/2018 <1.0 <1.0 <1.0 <1.0 56 <0.1
41h Qtr 12/12/2018 <1.0 <1.0 <1.0 <1.0 54.9 <0.1 1st Qtr 3/16/2019 <1.0 <1.0 <1.0 <1.0 48.9 <0.1 2nd Qtr 6/13/2019 <1.0 <1.0 <1.0 <1.0 50.2 <0.1 3rd Qtr 9/11/2019 <1.0 <1.0 <1.0 <1.0 47.9 <0.1
4th Qtr 12/10/2019 <1.0 <1.0 <1.0 <1.0 54.4 <0.1
1st Qtr 3/17/2020 <1.0 <1.0 <1.0 <1.0 50.0 <0.1
2nd Qtr 6/11/2020 <1.0 <1.0 <1.0 <1.0 49.0 <0.1 3rd Qtr 9/17/2020 <1.0 <1.0 <1.0 <1.0 48.8 <0.1 4th Qtr 11/4/2020 <1.0 <1.0 <1.0 <1.0 49.3 <0.1 1st Qtr 3/17/2021 <1.0 <1.0 <1.0 <1.0 51.6 <0.1
2nd Qtr 6/16/2021 <1.0 <1.0 <1.0 <1.0 48.8 <0.1 3rd Qtr 9/15/2021 <1.0 <1.0 <1.0 <1.0 42.8 <0.1
(1) As of March 2012 both north and south wild life ponds no longer receiving water.
NA = not analyzed
Shaded indicates concentrations exceeding GWQS J Approximated value.
TABLE 1 (25 of 33)
Historic Summary Of Monitoring Well Analytical Results Up To The 3rd Qarter 2021
Chloroform Contamination Investigation
DUSA White Mesa Mill
TW4-24 (nitrate pumping well started 1/28/13)
Sampling Event
Parameter
(GWQS)
Carbon Tetrachloride
(5 pg/L)
Chloroform
(70 pg/L)
Chloromethane
(30 pg/L)
Methylene Chloride
(5 pg/L)
Chloride
No GWQS (mg/L)
Nitrate, Nitrate + Nitrite
(10 mg/L) 2nd Qtr 6/27/2007 <1.0 2.6 <1.0 <1.0 770 26.1 3rd Qtr 8/15/2007 <1.0 2.2 <1.0 <1.0 791 29 4th Qtr 10/10/2007 <1.0 1.5 <1.0 <1.0 692 24.7
1st Qtr 3/28/2008 <1.0 1.5 <1.0 <1.0 740 24.4 2nd Qtr 6/25/2008 <1. 0 1.4 <1.0 <1.0 834 45.3 3rd Qtr 9/10/2008 <1.0 2.9 <1.0 <1.0 1,180 38.4 4th Qtr 10/15/2008 NA #N/A NA NA 1,130 44.8 11/18/2008 <2.0 <2.0 <2.0 <2.0 #N/A #N/A
1st Qtr 3/4/2009 <1.0 1 4 • <1.0 <1.0 1,010 30.5 2nd Qtr 6/23/2009 <1.0 1.5 <1.0 <1.0 759 30.4 3rd Qtr 9/14/2009 <1,0 1.4 <1.0 <1.0 618 30.7 4th Qtr 12/16/2009 <1.0 1.2 <1.0 <1.0 1,080 28.3 1st Qtr 3/25/2010 <1.0 1.3 <1.0 <1.0 896 33.1
2nd Qtr 6/14/2010 <1.0 1.7 <1.0 <1.0 639 30 3rd Qtr 8/24/2010 <1.0 1.8 <1.0 <1.0 587 31 4th Qtr 10/15/2010 <1.0 1.4 <1.0 <1.0 522 31 ............. 1st Qtr 2/16/2011 <1.0 1.8 <1.0 <1.0 1,100 31 2nd Qtr 6/14/2011 <1.0 1.1 <1.0 <1.0 1,110 35 3rd Qtr 8/16/2011 <1.0 1.7 <1.0 <1.0 967 34 4th Qtr 11/15/2011 NA #N/A NA NA 608 35 (1) 12/7/2011 <1.0 1.2 <1.0 <1.0 #N/A #N/A 1'ifafF(2) 1/16/2012 <1.0 1.0 ,-- <1.0 <1.0 373 37
2nd Qtr 6/6/2012 <1.0 <1.0 <1.0 <1.0 - 355 3/ 3rd Qtr 8/30/2012 <1.0 <1.0 <1.0 <1.0 489 37 4th Qtr 10/3/2012 <1.0 1 <1.0 <1.0 405 38
1st Qtr (3) 2/11/2013 <1.0 1 <1.0 ,- <1.0 1,260 - 35.9. 2nd Qtr 6/5/2013 <1.0 17.4 <1.0 <1.0 916 23.7 3rd Qtr 8/30/2013 <1.0 21.8 <1.0 <1.0 998 33 4th Qtr 10/29/2013 <1.0 32.5 <1.0 <1.0 1.,030 35 1st Qtr 1/27/2014 1.18 78.5 <1.0 <1.0 809 31.6 2nd Qtr 5/19/2014 <1.0 62.7 <1.0 <1.0 1 020 35.0 3rd Qtr 8/11/2014 <1.0 76.3 <1.0 <1.0 1,150 31.5 4th Qtr 10/21/2014 <1.0 25.8 <1.0 <1.0 1.,050 35.7
1st Qtr 3/9/2015 <1.0 49.2 <1.0 <1.0 944 34.6
2nd Qtr 6/8/2015 <1.0 4.28 <1.0 <1.0 1,290 31.8 3rd Qtr 8/31/2015 <1.0 46.9 <1.0 <1.0 788 25.3 4th Qtr 10/19/2015 <1 0 25.3 <1 0 <1 0 909 29 6 1st Qtr 3/9/2016 <1.0 22.8 <1.0 <1.0 989 ---- 29.1 2nd Qtr 5/23/2016 <1.0 69.6 <1.0 <1.0 771 24.2
3rd Qtr 7/25/2016 <1.0 17.8 <1.0 <1.0 1,180 34.4
4th Qtr 10/12/2016 <1.0 20.8 .0.0 <1.0 1,010 31.9
1st Qtr 3/8/2017 <1.0 18.3 <1.0 <1.0 1,090 41.3 2nd Qtr 6/13/2017 <1.0 17.2 <1.0 <1.0 1,080 39.9 3rd Qtr 7/26/2017 <1.0 17.8 <1.0 <1.0 1,230 40.0 4th Qtr 10/11/2017 <1.0 16.0 <1.0 <1.0 895 31.7
DWMRC.spirtsample <0.38 36.0 <0.60 1.3 ) 1 100 , 32.0
1st Qtr 3/16/2018 <1.0 24.9 <1.0 <1.0 1,320 44.9
2nd Qtr 6/14/2018 <1.0 49.2 <1.0 <1.0 792 33.6 3rd Qtr 8/22/2018 <1.0 35 <1.0 <1.0 996 33.8 4th Qtr 11/28/2018 <1.0 21 <1.0 <1.0 1,100 38.4
DWhARC spAsilli,i9 <5.0 60 <5.0 <5.0 1,000 34.0 ............ st Qtr 3/8/2019 <1.0 28.1 <1.0 <1.0 1,040 39.
2nd Qtr 6/5/2019 <1.0 28.8 <1.0 <1.0 1,020 33.2 3rd Qtr 9/4/2019 <1.0 31.1 <1.0 <1.0 1,130 36.4 4th Qtr 12/10/2019 <1.0 43.3 <1.0 <1.0 1,090 33.8 1st Qtr 2/19/2020 <1.0 61.7 <1.0 <1.0 1,010 37.1
2nd Qtr 5/27/2020 <1.0 49.4 <1.0 <1.0 1,060 41.7 3rd Qtr 9/4/2020 <1.0 63.8 <1.0 <1.0 1,100 39.1
4th Qtr 10/28/2020 <1.0 72.6 <1.0 <1.0 1 050 35.9 st Qtr 2/23/2021 <1.0 96.2 3.6 <1.0 1,170 41.9 2nd Qtr 6/9/2021 <1.0 41.9 <1.0 <1.0 938 48.0 3rd Qtr 8/26/2021 <1.0 103 <1.0 <1.0 1,010 26.7
(1) VOCs were resarnpled because laboratory missed holding ime. ,rth and south mid life ponds no longer recerving water.
(3) Chloroforto purnpin2 well started 1/26/13.
NA = not analyzed
Shaded indicates concentrations exceeding GWQS.
J = Approximated value
TABLE 1 (26 of 33)
Historic Summary Of Monitoring Well Analytical Results Up To The 3rd Qarter 2021
Chloroform Contamination Investigation DUSA White Mesa Mill
TW4-26
(nitrate pumping well started 1/26/13)
Sampling Event
Parameter
(GWQS)
Carbon Tetrachloride
(5 pg/L)
Chloroform
(70 pg/L)
Chloromethane
(30 pg/L)
Methylene Chloride
(5 pg/L)
Chloride
No GWQS (mg/L)
Nitrate, Nitrate + Nitrite
(10 mg/L)
2nd Qtr 6/27/2007 <1.0 <1.0 <1.0 <1.0 395 17.1
3rd Qtr 8/15/2007 <1.0 2.2 <1.0 <1.0 382 29
4th Qtr 10/10/2007 <1.0 <1.0 <1.0 <1.0 358 17 1st Qtr 3/28/2008 <1.0 <1.0 <1.0 <1.0 374 18.7
2nd Qtr 6/25/2008 <1.0 <1.0 <1.0 <1.0 , 344 22.1
3rd Qtr 9/10/2008 <1.0 <1.0 , <1.0 <1.0 333 18.8
4th Qtr 10/15/2008 NA #N/A NA NA 366 21.3
11/18/2008 <2.0 <2.0 <2.0 <2.0 #N/A #N/A
1st Qtr 3/4/2009 <1.0 <1.0 <1.0 <1,.0 3 15.3
2nd Qtr 6/23/2009 <1.0 <1.0 <1.0 <1.0 328 15.3
3rd Qtr 9/14/2009 <1.0 <1.0 <1.0 <1.0 328 3.3
4th Qtr 12/16/2009 <1.0 <1.0 <1.0 <1.0 371 14.2
1st Qtr 3/23/2010 <1.0 <1.0 <1.0 <1.0 296 14.4
2nd Qtr 6/14/2010 <1.0 <1.0 <1.0 <1.0 306 16 3rd Qtr 8/10/2010 <1.0 <1.0 <1.0 <1.0 250 14
4th Qtr 10/15/2010 <1.0 <1.0 <1.0 <1.0 312 15
1st Qtr 2/16/2011 <1.0 1.8 <1.0 <1.0 315 15
2nd Qtr 5/25/2011 <1.0 <1.0 <1.0 <1.0 321 16
3rd Qtr 8/16/2011 <1.0 <1.0 <1.0 <1.0 , 276 16
4th Qtr 11/15/2011 <1.0 <1.0 <1.0 <1.0 294 16 1 afair (-2) 1/16/2012 <1.0 <1.0 .. ..._ . <1.0 <1.0 _ 304 16 -2nd Qtr 5/31/2012 <7.8 <1.0 <1.0 <1.0 287.- 16
3rd Qtr 9/4/2012 <1.0 <1.0 <1.0 <1.0 334 17
4th Qtr
'-1 st Qtr (3)
10/3/2012
2/11/2013
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0, ,
<1.0 .- <1.0 190
3384- 17
9.04
2nd Qtr 6/5/2013 <1.0 <1.0 <1.0 <1.0 136 5.24
3rd Qtr 9/4/2013 <1.0 <1.0 <1.0 <1.0 119 5.69
4th Qtr 10/31/2013 <1.0 <1.0 <1.0 <1.0 88.6 6.1
1st Qtr 1/27/2014 <1.0 <1.0 <1.0 <1.0 85.7 2.16
2nd Qtr 5/19/2014 <1.0 <1.0 <1.0 <1.0 51.1 1.21
3rd Qtr 8/11/2014 <1.0 <1.0 <1.0 <1.0 67 1.6
4th Qtr 10/21/2014 <1.0 <1.0 <1.0 <1.0 58.1 1.03
1st Qtr 3/9/2015 <1.0 <1.0 <1.0 <1.0 310 14.4
2nd Qtr 6/8/2015 <1.0 <1.0 <1.0 <1.0 58.3 1.14
3rd Qtr 8/31/2015 <1.0 <1.0 <1.0 <1.0 69.2 1.63
41h Qtr 10/19/2015 <1 0 <1 0 <1 0 <1.0 93.7 1.78
1st Qtr 3/9/2016 <1.0 <1.0 <1.0 <1.0 62.7 0.837
2nd Qtr 5/23/2016 <1.0 <1.0 <1.0 <1.0 75.5 0.959 , 3rd Qtr 7/25/2016 <1.0 <1.0 <1.0 <1.0 74.1 1.78
4th Qtr 10/12/2016 <1.0 <1.0 <1.0 <1.0 59.8 1.24
1st Qtr 3/8/2017 <1.0 1.15 <1.0 <1.0 285 17.0
2nd Qtr 6/13/2017 <1.0 <1.0 <1.0 <1.0 69.8 , 0.976
3rd Qtr 7/26/2017 <1.0 <1.0 <1.0 <1.0 70.1 1.23
4th Qtr 10/11/2017 <1.0 <1.0 <1.0 <1.0 68.0 1.29
1st Qtr 3/12/2018 <1.0 1.15 <1.0 <1.0 70.5 2.23
2nd Qtr 6/14/2018 <1.0 <1.0 <1.0 <1.0 60.3 1.14
3rd Qtr 8/22/2018 <1.0 <1.0 <1.0 <1.0 69.1 , 0,810 , 4th Qtr 11/28/2018 <1.0 <1.0 <1.0 <1.0 59.7 0.61
lst Qtr 3/8/2019 <1.0 <1.0 <1.0 <1.0 65 0.639
2nd Qtr 6/5/2019 <1.0 <1.0 <1.0 <1.0 59 0.821
3rd Qtr 9/4/2019 <1.0 <1.0 <1.0 <1.0 58.1 0.548
4th Qtr 12/10/2019 <1.0 <1.0 <1.0 <1.0 73.1 0.841
1st Qtr 2/19/2020 <1.0 <1.0 <1.0 <1.0 86.0 0.607
2nd Qtr 5/27/2020 <1.0 <1.0 <1.0 <1.0 76.8 0.851
3rd Qtr 9/4/2020 <1.0 <1.0 <1.0 <1.0 67.3 0.994
4th Qtr 10/28/2020 <1.0 <1.0 <1.0 <1.0 61.3 1.64
1st Qtr 2/23/2021 <1.0 <1.0 <1.0 <1.0 .„ 100 3.43
2nd Qtr 6/9/2021 <1.0 <1.0 <1.0 <1.0 55.1 1.57
3rd Qtr 8/26/2021 <1.0 <1.0 1 34 <1.0 69.3 0.793
(1) VOCs were resampled because laboratory missed holding time. (2) As of March 2012 both north and south wild lite ponds no longer receleing water,
9) Chloroform purnping well started 1/26/13.
NA = not analyzed
Shaded indicates concentrations exceeding GWOS.
Parameter
(GWQS)
Carbon Tetrachloride
(5 pg/L)
Chloroform
(70 pg/L)
Chloromethane
(30 pg/L)
Methylene Chloride
(5 pg/L)
Chloride
No GWQS (mg/L)
Nitrate, Nitrate + Nitrite
(10 mg/L)
TW4-26
Sampling Event
2nd Qtr 6/14/2010
3rd Qtr 8/24/2010
4th Qtr 10/15/2010
1st Qtr 2/16/2011 2nd Qtr 5/26/2011
3rd Qtr 8/17/2011
4th Qtr 11/16/2011
(.11 12/7/2011 1st Qtr (2) 1/18/2012
2nd Qtr 6/6/2012 3rd Qtr 9/11/2012
4th Qtr 10/3/2012
1st Qtr 2/11/2013
2nd Qtr 6/13/2013
3rd Qtr 9/5/2013 4th Qtr 11/7/2013
1st Qtr 1/29/2014
2nd Qtr 5/21/2014
3rd Qtr 8/11/2014
4th Qtr 10/28/2014 1st Qtr 3/12/2015
2nd Qtr 6/10/2015
3rd Qtr 9/3/2015
4th Qtr 10/28/2015
1st Qtr 3/16/2016 2nd Qtr 5/26/2016
3rd Qtr 8/3/2016
4th Qtr 10/20/2016
1st Qtr 3/16/2017
2nd Qtr 6/20/2017
3rd Qtr 8/3/2017
4th Qtr 10/11/2017 1st Qtr 3/21/2018
2nd Qtr 6/14/2018
3rd Qtr 9/6/2018
4th Qtr 12/13/2018
1st Qtr 3/20/2019 2nd Qtr 6/5/2019
3rd Qtr 9/12/2019
4th Qtr 12/18/2019
1st Qtr 3/18/2020
2nd Qtr 6/12/2020
3rd Qtr 9/19/2020
4th Qtr 11/11/2020
1st Qtr 3/24/2021
2nd Qtr 6/17/2021
3rd Qtr 9/23/2021
TW4-27 1 f"Oir- (2) 1/18/2012
2nd Qtr 6/13/2012
3rd Qtr 9/4/2012
4th Qtr 10/3/2012
1st Qtr 2/7/2013
2nd Qtr 6/13/2013
3rd Qtr 8/30/2013
4th Qtr 11/6/2013
1st Qtr 1/23/2014
2nd Qtr 5/21/2014
3rd Qtr 8/13/2014 4th Qtr 10/28/2014
1st Qtr 3/11/2015
2nd Qtr 6/10/2015
3rd Qtr 9/2/2015
4th Qtr 10/28/2015 1st Qtr 3/16/2016
20d Qtr 5/26/2016
3rd Qtr 8/3/2016
4th Qtr 10/20/2016
1st Qtr 3/15/2017
2nd Qtr 6/15/2017
3rd Qtr 8/2/2017
4th Qtr 10/10/2017
1st Qtr 3/14/2018
2nd Qtr 6/13/2018
3rd Qtr 8/30/2018
4th Qtr 12/12/2018
1st Qtr 3/16/2019 2nd Qtr 6/13/2019
3rd Qtr 9/11/2019
4th Qtr 12/14/2019
1st Qtr 3/18/2020
2nd Qtr 6/11/2020
3rd Qtr 9/18/2020 4th Qtr 11/4/2020 1st Qtr 3/18/2021
2nd Qtr 6/17/2021 3rd Qtr 9/15/2021
13 <1 0 < 1 0
5.2 <1 0 < 1 0
5.4 <1 0 < 1 0 2 <1 0 < 1 0 2.9 <1 0 < 1 0
2.8 <1 0 <1.0
#N/A NA NA
5.2 <1.0 <1.0
7 <1 0 <1.0
4.1 <1.0 <1.0 4.9 <1.0 <1.0 4.9 <1.0 <1 0
4.9 <1.0 <1.0
2.12 <1.0 <1 0
2.81 <1 0 <1 0 3.37 <1 0 <1 0
1.43 <1 0 <1.0
4.23 <1.0 <1.0
1.3 <1 0 <1.0
2.45 <1 0 <1 0 2.37 <1 0 <1.0
6.12 1 17 <1.0
4.77 <1.0 <1 0
3.45 <1 0 <1.0
1.8 <1 0 <1 0 8.23 <1 0 <1.0
4.42 <1.0 <1 0 19.9 <1.0 <1.0
46.1 <1.0 <1.0
244 <1.0 <1 0
419 <1.0 <1.0
608 <1.0 <1 0 1,050 <1.0 <1 0
960 <1 0 <1 0
916 <1.0 <1.0
1,J:350 <1.0 <1 0
963 <1.0 <1.0 1,070 <1.0 <1.0
877 <1.0 <1 0
1_,970 <1.0 <1 0
1,090 <1 0 <1.0
1,140 <1.0 <1.0
1120 <1 0 <1 0
1 160 <1.0 <1 0
1,030 <1.0 <1 0
1,020 <1.0 <1 0
927 <1 0 <1 0
9 <1.0 <1 0
<1 0 <1 0 <1 0
<1.0 <1 0 <1 0
<1 0 <1 0 <1 0
<1.0 <1 0 <1 0
<1.0 <1 0 <1.0 <1,0 <1 0 <1.0
<1 0 <1 0 <1.0
<1 0 <1 0 <1 0
<1 0 <1.0 <1.0
<1.0 <1.0 <1.0 <1 0 <1.0 <1.0
<1 0 <1.0 <1.0
<1.0 <1.0 <1.0
1.3 <1.0 <1 0
1.6 <1 0 <1 0 2.11 <1 0 <1.0 3.16 <1 0 <1 0
2.78 <1 0 <1 0 3.8 <1 0 <1.0
4.33 <1 0 <1.0
5.65 <1.0 <1.0
6.05 <1 0 <1.0
5.91 <1.0 <1.0 6.95 <1.0 <1.0
5.95 <1.0 <1.0
7.35 <1 0 <1.0
7.7 <1 0 <1.0
6.54 <1 0 <1.0 8.24 <1 0 <1.0
7.58 <1 0 <1.0
7.97 <1 0 <1 0
8.04 <1.0 <1.0
7.92 <1 0 <1 0
5.62 <1 0 <1 0
7.8 <1 0 <1 0 4.66 <1.0 <1 0 4.26 <1 0 <1 0 3.81 <1 0 <1 0
<1 0
<1 0
<1 0
<1 0 <1 0
<1 0
NA
<1.0
<1 0
<1.0 <1 0 <1 0
<1.0
<1.0
<1 0 <1 0
<1.0
<1.0
<1 0
<1 0 <1.0
<1.0
<1.0
<1.0
<1.0 <1.0
<1.0
<1 0
<1 0
<1 0
<1.0
<1.0 <1.0
<1.0
<1.0
<1.0
<1.0 <1.0
<1.0
<1.0
<1 0
<1 0
<1 0 <1 0
<1 0
<1 0
<1 0
33
17
22
30 15
19
26
7 9
9 0
9.6
10.0 10.0
11.0
10.0
#NIA #N/A
13 7
15.2
13.9 14.2
16.2
19
25.8
27.3 35.5
33.5
38.9
33.4
32.9 35.8
32.0
38.3
36.3
35 1
34.8 36.3 ............. . 38.9
19
19
19
16.6
14.5
17.6 15.9
16.9 15.4
15
14.6
14.4
14.4 14
13 3
17 11.0
12.0
9.0
12.0
12.5
13.6
11.7
15 9
14.2
12.5
10.8
12.3 14.4 11.3
14.2
13.9
16.9
13.9
17.9 15.0
15.8
15.2
15.2
11.8
12.2 12.6 10.9
10.3
11.9
11.1
10.5 11.9
11.3
10.0 12.2
13.2
13.5
17
21
18
18.8
20.3 19
21.8
31 8
20.6
23 24.4
26.2
26.8
26.8
26.2 28 21.2
27.1 29.4
28 3
27 9
29.5
26.3 30.3
28.3
31.4
28.2
26.2
28 6
25.3 27.4
27.6
28.0
26.2
26.8 27.5 25.8 21.7
34
36.5
11 24.0
41.0
37.0
. 3§.:9 31.2
21.5 19.5
22.0
18.1
20.8
21.5
22.3 21.2
4.0
23.6
21.5
25.2
16.7 23.0 23.8 21.1
29.4 27.2
29.8
31.3
31.1
27.0 28.2
26.5
24.0
20.9
23.5
25.0 28.7 21.8 19.3
22.2
23.8
20.0
14.2
12.1
<1.0
<1 0
<1 0
<1 0
<1 0
<1 0 <1 0
<1 0
<1 0
<1 0
<1 0 <1 0
<1 0
<1.0
<1.0 <1.0 <1 0 <1 0
<1 0
<1.0
<1 0
<1 0 <1 0
<1 0 <1 0
<1 0
<1.0
<1 0
<1.0 <1 0 <1 0
<1 0
<1 0
<1.0
<1 0 <1 0 <1 0 <1 0 <1 0
TABLE 1 (27 of 33)
Historic Summary Of Monitoring Well Analytical Results Up To The 3rd Qarter 2021
Chloroform Contamination Investigation
DUSA White Mesa Mill
(1) VOCs were resampled because laboratory missed holding tme. (2) As of March 2012 both north and south wild life ponds no longer recemng water.
NA = not analyzed
Shaded indicates concentrations exceeding GWQS.
TW4-28
Sampling Event
Parameter
(GWOS)
Carbon Tetrachloride
(5 pg/L)
Chloroform
(70 pg/L)
Chloromethane
(30 pg/L)
Methylene Chloride
(5 pg/L)
Chloride
No GWQS (m9LL)
2nd Qtr 6/19/2013 <1 0 <1 0 <1.0 <1 0 44 6
3rd Qtr 8/29/2013 <1 0 <1 0 <1.0 <1 0 45.3
4th Qtr 11/6/2013 <1 0 <1 0 <1 0 <1 0 45.3
1st Qtr 1/22/2014 <1.0 <1 0 <1.0 <1 0 47.8
2nd Qtr 5/21/2014 <1.0 <1 0 <1.0 <1 0 45.7
3rd Qtr 8/13/2014 <1.0 <1 0 <1.0 <1 0 50
4th Qtr 10/23/2014 <1 0 <1 0 <1.0 <1 0 52.1
1st Qtr 3/11/2015 <1.0 <1 0 <1.0 <1 0 52.2
2nd Qtr 6/10/2015 <1.0 <1 0 <1.0 <1 0 56.4 3rd Qtr 9/2/2015 <1.0 <1.0 <1.0 <1 0 61.4
4th Qtr 10/21/2015 <1.0 <1.0 <1.0 <1 0 52.7
ist Qtr 3/15/2016 <1 0 <1.0 <1.0 <1 0 61.6
Duplicate TW4-65 <1 0 <1.0 <1.0 <1.0 61.4
2nd Qtr 5/25/2016 <1 0 <1.0 <1 0 <1 0 67.1 3rd Qtr 7/27/2016 <1 0 <1.0 <1.0 <1 0 70.1
Duplicate TW4-65 <1 0 <1.0 <1.0 <1 0 70.9
4th Qtr 10/19/2016 <1 0 <1.0 <1 0 <1.0 70.9
Rttplicate TW4-65 <1 0 <1 0 <1 0 <1.0 73.7
11 st Qtr 3/14/2017 <1 0 <1 0 <1 0 <1.0 64.2
Duplicate TW4-65 <1 0 <1 0 <1 0 <1.0 66.4
2nd Qtr 6/14/2017 <1 0 <1 0 <1 0 <1.0 68.6
3rd Qtr 7/27/2017 <1 0 <1 0 <1 0 <1 0 67.1
4th Qtr 10/10/2017 <1 0 <1.0 <1.0 <1.0 57.4
1st Qtr 3/14/2018 <1 0 <1.0 <1 0 <1.0 65.0
2nd Qtr 6/12/2018 <1 0 <1 0 <1 0 <1.0 55.7
Duplicate TW4-65 <1 0 <1 0 <1 0 <1.0 56.7
3rd Qtr 8/29/2018 <1 0 <1 0 <1 0 <1 0 63.8
4th Qtr 11/30/2018 <1 0 <1.0 <1 0 <1.0 52.4
1st Qtr 3/16/2019 <1 0 <1.0 <1 0 <1.0 51.7
2nd Qtr 6/13/2019 <1 0 <1.0 <1 0 <1 0 51.8
3rd Qtr 9/11/2019 <1 0 <1.0 <1 0 <1.0 49.0
4th Qtr 12/12/2019 <1 0 <1.0 <1 0 <1 0 50.0
1st Qtr 3/17/2020 <1 0 <1.0 <1.0 <1.0 52.1
2nd Qtr 6/10/2020 <1.0 <1.0 <1 0 <1 0 49.8
3rd Qtr 9/17/2020 <1 0 <1 0 <1 0 <1 0 47.4
4th Qtr 11/4/2020 <1 0 <1 0 <1 0 <1 0 49.0
1st Qtr 3/17/2021 <1 0 <1 0 <1.0 <1 0 51.8
2nd Qtr 6/15/2021 <1 0 <1 0 <1 0 <1 0 48.5
3rd Qtr 9/15/2021 <1 0 <1 0 <1 0 <1 0 40.7
TW4-29
2nd Qtr 6/19/2013 <1 0 242 <1 0 <1 0 44.8
2nd Qtr 7/11/2013 <1 0 262 <1 0 <1 0 37.7
3rd Qtr 9/26/2013 <1 0 246 <1 0 <1 0 41.4
4th Qtr 11/13/2013 <1 0 260 <1 0 <1 0 42.5
1st Qtr 2/5/2014 <1 0 258 <1 0 <1 0 14.9
2nd Qtr 5/22/2014 <1 0 262 <1 0 <1 0 38.2
3rd Qtr 8/27/2014 <1 0 242 <1 0 <1 0 41
4th Qtr 10/29/2014 <1 0 290 <1 0 <1 0 41
1st Qtr 3/12/2015 <1 0 299 <1 0 <1 0 40.5 2nd Qtr 6/11/2015 <1 0 329 <1 0 <1 0 42.5
3rd Qtr 9/3/2015 <1.0 276 <1 0 <1.0 47.3
4th Qtr 10/29/2015 <1 0 631 <1 0 <1.0 39.8
1st Qtr 3/17/2016 <1.0 335 <1 0 <1 0 40.5
2nd Qtr 6/8/2016 <1.0 366 <1 0 <1 0 42.9
3rd Qtr 8/3/2016 <1 0 401 <1 0 <1 0 40.6 4th Qtr 10/26/2016 <1 0 392 <1.0 <1 0 44 2
1st Qtr 3/16/2017 <1 0 446 <1.0 <1 0 41.5
2nd Qtr 6/4/2017 <1 0 420 <1 0 <1 0 42
3rd Qtr 8/4/2017 <1 0 466 <1 0 <1 0 42 9
4th Qtr 10/11/2017 <1 0 431 <1 0 <1 0 37.7
1st Qtr 3/14/2018 <1 0 533 <1 0 <1.0 43.1
2nd Qtr 6/14/2018 <1 0 474 <1.0 <1 0 40 1
3rd Qtr 8/29/2018 <1 0 454 <1 0 <1 0 45 9
4th Qtr 12/13/2018 <1 0 521 <1 0 <1.0 40 9
1st Qtr 3/20/2019 <1 0 507 <1 0 <1 0 39.9
2nd Qtr 6/13/2019 <1.0 537 <1 0 <1 0 39.4
3rd Qtr 9/12/2019 <1 0 549 <1 0 <1 0 38
4th Qtr 12/18/2019 <1 0 630 <1.0 <1 0 44.8
15t Qtr 3/18/2020 <1 0 652 <1 0 <1 0 41
2nd Qtr 6/12/2020 <1 0 686 <1 0 <1 0 42.2
3rd Qtr 9/19/2020 <1 0 621 <1 0 <1 0 39.9
4th Qtr 11/11/2020 <1 0 671 <1 0 <1.0 40 8
DWMRC..s.pht samplp <10 670 <20 <20 42
lst Qtr 3/24/2021 <1 0 577 <1 0 <1 0 44.3 2nd Qtr 6/17/2021 <1 0 543 <1 0 <1 0 40 3rd Qtr 9/23/2021 <1 0 602 <1 0 <1 0 40.1
Nitrate, Nitrate + Nitrite
(10 mg/L)

14.9
17.3
16.2
16.9 16.5
14.2
16.5
19.0
19.0 17.8
18.7

34.0
32.6
29.0 31.3
35.6
25.5
25.4
24.4
27.9
26.0
24.8
24.8
17.2 19.0
18.7
16.0
17.7
17.2 15.0 10.2
9.48
9.87
9.55
8.36
7.76
8.68 9.09
8.08

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

TABLE 1 (28 of 33)
Historic Summary Of Monitoring Well Analytical Results Up To The 3rd Qarter 2021
Chloroform Contamination Investigation
DUSA White Mesa Mill
H = Sample was analyzed beyond holding times and may not be accureate concentration. Shaded indicates concentrations exceeding GWQS.
TABLE 1 (29 of 33)
Historic Summary Of Monitoring Well Analytical Results Up To The 3rd Qarter 2021
Chloroform Contamination Investigation
DUSA White Mesa Mill
TW4-30
Sampling Event
Parameter
(GWQS)
Carbon Tetrachloride
(5 pg/L)
Chloroform
(70 pg/L)
Chloromethane
(30 pg/L)
Methylene Chloride
(5 pg/L)
Chloride
No GWQS (mg/L)
Nitrate, Nitrate + Nitrite
(10 mg/L)
2nd Qtr 6/19/2013 <1.0 <1.0 <1.0 <1.0 36 0.95
3rd Qtr 9/26/2013 <1.0 <1.0 <1.0 <1.0 36.3 0.952
4th Qtr 11/13/2013 <1.0 <1.0 <1.0 <1.0 35.9 1.24
1st Qtr 1/23/2014 <1.0 <1.0 <1.0 <1.0 36.9 1.36
2nd Qtr 5/22/2014 <1.0 <1.0 <1.0 <1.0 31.9 1.44 3rd Qtr 8/23/2014 <1.0 <1.0. <1.0 <1.0 38 1.5
4th Qtr 10/23/2014 <1.0 <1.0 <1.0 <1.0 37.1 1.84
1st Qtr 3/11/2015 <1.0 1.65 <1.0 <1.0 38.3 2.15
2nd Qtr 6/11/2015 <1.0 2.25 <1.0 <1.0 40.3 1.75
3rd Qtr 9/3/2015 <1.0 3.27 <1.0 <1.0 44.2 1.75 4th Qtr 10/28/2015 <1.0 3.48 <1.0 <1.0 37.8 1.86
1st Qtr 3/17/2016 <1.0 5.16 <1.0 <1.0 39.6 2.74 „ 2nd Qtr 5/26/2016 <1.0 7.38 <1.0 <1.0 40.2 2.04 „ . 3rd Otr 8/3/2016 <1.0 6.79 <1.0 <1.0 38.6 2.32
4th Qtr 10/20/2016 <1.0 8.69 <1.0 <1.0 41.3 2.51 1st Qtr 3/15/2017 <1.0 13.6 <1.0 <1.0 37.7 2.70
2nd Qtr 6/15/2017 <1.0 15.2 <1.0 <1.0 37.8 2.95
3rd Qtr 8/3/2017 <1.0 15.7 <1.0 <1.0, 39.8 3.11
4th Qtr 10/10/2017 <1.0 13.4 <1.0 <1.0 34.9 2.58
1st Qtr 3/15/2018 <1.0 16.4 <1.0 <1.0 41 3.63 2nd Qtr 6/13/2018 <1.0 16.9 <1.0 <1.0 37.4 3.93
3rd Qtr 8/30/2013 <1.0 _19.8 <1.0 <1.0 44.1 3.79
4th Qtr 12/12/2018 <1.0 23.9 <1.0 <1.0 35.5 3.70 ............ lst Qtr 3/15/2019 <1.0 25.3 <1.0 <1.0 35.9 4.08
2nd Qtr 6/13/2019 <1.0 31.5 <1.0 <1.0 27.2 4.13 3rd Qtr 9/11/2019 <1.0 34.8 <1.0 <1.0 , 34.5 3.79
4th Qtr 12/18/2019 <1.0 44.9 <1.0 <1.0 39.1 ................ 3.62
1st Qtr 3/17/2020 <1.0 53.1 <1.0 <1.0 37.5 3.85
2nd Qtr 6/12/2020 <1.0 65.4 <1.0 <1.0 38.6 3.69
3rd Qtr 9/18/2020 <1.0 67.7 <1.0 <1.0 . 35 3.49
4th Qir 11)11/2020 <1.0 82.8 <1.0 <1.0 37.1 3.64 IDWMRC spyt sarsple <10 66 <20 <20 39 <0.5 H
1st Qtr 3/17/2021 <1.0 74.8 <1.0 <1.0 37.6 3.54
2nd Qtr 6/17/2021 <1.0 78.7 <1.0 <1.0 38.3 4.19
3rd Qtr 9/22/2021 <1.0 78.2 <1.0 <1.0 23.5 2.60
TW4-31
2nd Qtr, 6/19/2013 , <1.0 <1.0 <1.0 <1.0, , 28.4 ,1.3
3rd Qtr 9/5/2013 <1.0 <1.0 <1.0 <1.0 29.4 1.1
4th Qtr 11)7/2013 <1.0 <1.0 <1.0 <1.0 28 1.33 1st Qtr 1/23/2014 <1.0 <1.0 <1.0 <1.0 28.5 1.32
2nd Qtr 5/21/2014 <1.0 <1.0 <1.0 <1.0 26.3 1.22
3rd Qtr 8/13/2014 <1.0 <1.0 <1.0 <1.0 30 1.1
4th Qtr 10/28/2014 <1.0 <1.0 <1.0 <1.0 37.1 1.84 1st Qtr 3/11/2015 <1.0 <1.0 <1.0 <1.0 30.6 1.33
2nd Qtr 6/10/2015 <1.0 <1.0 <1.0 <1.0 31.1 1.19
3rd Qtr 9/2/2015 <1.0 <1.0 <1.0 <1.0 30.4 0.916
Attpy_... 10/21/2015 <1.0 <1.0 <1.0 <1.0 29.1 0.953
i st Qtr 3/11/2016 <1.0 <1.0 <1.0 <1.0 31.5 1.84 2nd Qtr, 5/25/2016 <1.0 <1.0 <1.0 <1.0 32.5 1.36
ard Otr 7/28/2016 <1.0 <1.0 <1.0 <1.0 30.6 1.41
4th Qtr 10/20/2016 <1.0 <1.0 <1.0 <1.0 34 1.14 .................... 1st Qtr 3/15/2017 <1.0 <1.0 <1.0 <1.0 31.3 1.19
2nd Qtr 6/15/2017 <1.0 <1.0 <1.0 <1.0 33.4 1.21
3rd Qtr 8/2/2017 <1.0 <1.0 <1.0 <1.0 33 1.11 4th Qtr 10/10/2017 <1.0 <1.0 <1.0 <1.0 30.9 1.04
1st Qtr 3/14/2018 <1.0 <1.0 <1.0 <1.0 38.8 0.916
2nd Qtr 6/12/2018 <1.0 <1.0 <1.0 <1.0 34.4 0.948
3rd Qtr 8/29/2018 <1.0 <1.0 , <1.0 <1.0 40.3 0.710
4th Qtr 12/12/2018 <1.0 <1.0 <1.0 <1.0 35.2 0.766
1st Qtr 3/16/2019 <1.0 <1.0 <1.0 <1.0 35 , 0.754
2nd Qtr 6/13/2019 <1.0 <1.0 <1.0 <1.0 36.9 0.713
3rd Qtr 9/11/2019 <1.0 <1.0 <1.0 <1.0 , 35.8 0.61
4th Qtr 12/14/2019 <1.0 <1.0 <1.0 <1.0 40.6 0.58
1st Qtr 3/17/2020 <1.0 <1.0 <1.0 <1.0 38.2 0.572
2nd Qtr 6/12/2020 <1.0 <1.0 <1.0 <1.0 36.7 0.569 3rd Qtr 9/17/2020 <1.0 <1.0 <1.0 <1.0 36.5 0.51
4th Qtr 11/4/2020 <1.0 <1.0 <1.0 <'1 .0 36.4 0.501
1st Qtr 3/17/2021 <1.0 <1.0 <1.0 <1.0 40.3 0.501
2nd Qtr 6/16/2021 , <1.0 <1.0 <1.0 <1.0 , , 37.9 0.451
3rd Qtr 9/15/2021 <1.0 <1.0 <1.0 <1.0 31.2 0.46
Shaded indicates concentrations exceeding GWQS.
H = Sample was analyzed beyond holding times and may not be accureate concentration.
TABLE 1 (30 of 33)
Historic Summary Of Monitoring Well Analytical Results Up To The 3rd Qarter 2021
Chloroform Contamination Investigation
DUSA White Mesa Mill
TW4-32
Sampling Event
Parameter
(GWQS)
Carbon Tetrachloride
(5 pg/L)
Chloroform
(70 gg/L)
Chloromethane
(30 pg/L)
Methylene Chloride
(5 pg/L)
Chloride
No GWQS (mg/L)
Nitrate, Nitrate + Nitrite
(10 mg/L)
4th Qtr 11/14/2013 <1.0 <1.0 <1.0 <1.0 52.1 ............... 4.26 ........._ 151 Qtr 1/22/2014 <1.0 <1.0 <1.0 <1.0 54.5 5.11 2nd Qtr 5/21/2014 <1.0 <1.0 <1.0 <1.0 54.9 5.63 3rd Qtr 8/13/2014 <1.0 <1.0 <1.0 <1.0 64 4.2
4th Qtr 10/23/2014 <1.0 <1.0 <1.0 <1.0 62.6 2.14 1st Qtr 3/11/2015 <1.0 <1.0 <1.0 <1.0 64.2 2.46 Duplicate TW4-65 <1.0 <1.0 <1.0 <1.0 65.9 2.25 2nd Qtr 6/10/2015 <1.0 <1.0 <1.0 <1.0 62.7 1.21 3rd Qtr 9/2/2015 <1.0 <1.0 <1.0 <1.0 59.6 5.09
4th Qtr 10/21/2015 <1.0 <1.0 <1.0 <1.0 55.1 1.19 ist Qtr 3/15/2016 <1.0 <1.0 <1.0 <1.0 64.2 4.48 2nd Qtr 5/25/2016 <1.0 <1.0 <1.0 <1.0 71.8 3.16 3rd Qtr 7/28/2016 <1.0 <1.0 <1.0 <1.0 64.4 3.44 4th Qtr 10/19/2016 <1.0 <1.0 <1.0 <1.0 66 2.87
1st Qtr 3/17/2017 <1.0 <1.0 • <1.0 <1.0 62.8 2.82 2nd Qtr 6/15/2017 <1.0 <1.0 <1.0 <1.0 53.5 2.37 3rd Qtr 8/2/2017 <1.0 <1.0 <1.0 <1.0 65.8 2.47 4th Qtr 10/10/2017 <1.0 <1.0 <1.0 <1.0 65.8 2.47 .................. 1st Qtr 3/14/2018 <1.0 <1.0 <1.0 <1.0 65.4 2.94
2nd Qtr 6/12/2018 <1.0 <1.0 <1.0 59.2 2.51
3rd Qtr 8/29/2018 <1.0 <1.0 <1.0 <1.0 68.1 2.56
4th Qtr 11/30/2018 <1.0 <1.0 <1.0 <1.0 57.5 2.50 1st Qtr 3/16/2019 <1.0 <1.0 <1.0 <1.0 57.5 2.15 2nd Rtr 9/11/2019 <1.0 <1.0 <1.0 <1.0 60.1 2.18
3rd Qtr 9/11/2019 <1.0 <1.0 <1.0 <1.0 55 1.84 4th Otr 12/14/2019 <1.0 <1.0 <1.0 <1.0 64.7 1.89
1st Qtr 3/17/2020 <1.0 <1.0 <1.0 <1.0 59.7 1.97 2nd Qtr 6/10/2020 <1.0 <1.0 <1.0 <1.0 57.0 2.19 3rd Qtr 9/17/2020 <1.0 <1.0 <1.0 <1.0 50.8 1.58 4th Qtr 11/4/2020 <1.0 <1.0 <1.0 <1.0 53.7 1.74
1st Qtr 3/17/2021 <1.0 <1.0 <1.0 <1.0 60.5 1.80
2nd Qtr 6/15/2021 <1.0 <1.0 <1.0 <1.0 40.4 2.31 3rd Qtr 9/15/2021 <1.0 <1.0 <1.0 <1.0 46.1 1.57
TW4-33
4th Qtr 11/14/2013 <1.0 126 <1.0 <1.0 47.2 1.82 1st Otr 1/30/2014 <1.0 124 <1.0 <1.0 43.5 2.56 2nd Qtr 5/22/2014 <1.0 121 <1.0 <1.0 46.8 1.63 3rd Qtr 8/27/2014 <1.0 104 <1.0 <1.0 43 1.50 4th Qtr 10/29/2014 <1.0 124 <1.0 <1.0 44.2 2.22
1st Qtr 3/12/2015 <1.0 134 <1.0 <1.0 44.2 1.91 2nd Qtr 6/11/2015 <1.0 127 <1.0 <1.0 46.6 1.62 3rd Qtr 9/3/2015 <1.0 123 <1.0 <1.0 53.3 1.64 4th Qtr 10/29/2015 <1.0 129 - <1.0 <1.0 44.5 1.92
1st Qtr 3/17/2016 <1.0 122 <1.0 <1.0 46.2 2.13
2nd Qtr 6/8/2016 <1.0 96.1 <1.0 <1.0 49.7 2.06 3rd Qtr 8/4/2016 <1.0 121 <1.0 <1.0 48.5 2.32 4th Qtr 10/26/2016 <1.0 109 <1.0 <1.0 52.4 2.36 1st Qtr 3/17/2017 <1.0 90.7 <1.0 <1.0 49.0 2.11
2nd Qtr 6/20/2017 <1.0 103 <1.0 <1.0 49.2 2.34
3rd Qtr 8/3/2017 <1.0 127 <1.0 <1.0 46.9 2.04 4th Qtr 10/11/2017 <1.0 97.1 <1.0 <1.0 42.5 2.09 1st Qtr 3/15/2018 <1.0 • 128 <1.0 <1.0 49.2 1.94 2nd Qtr 6/13/2018 <1.0 87.8 <1.0 <1.0 44.0 2.13 3rd Qtr 9/5/2018 <1.0 113 <1.0 <1.0 50.0 1.82
4th Qtr 12/13/2018 <1.0 141 <1.0 <1.0 43.2 2.01
1st Qtr 3/20/2019 <1.0 86.2 <1.0 <1.0 47.2 Zeid
2nd Qtr 6/19/2019 <1.0 121 <1.0 <1.0 43.4 2.16 3rd Qtr 9/12/2019 <1.0 101 <1.0 <1.0 41.1 1.61 4th Qtr 12/18/2019 <1.0 117 <1.0 <1.0 48.8 1.86 1st Qtr 3/18/2020 <1.0 93.7 <1.0 <1.0 45.3 2.44
2nd Qtr 6/10/2020 <1.0 90.1 <1.0 <1.0 48.9 3.26
3rd Qtr 9/18/2020 <1.0 84.9 <1.0 <1.0 51.0 3.58 4th Qtr 11/11/2020 <1.0 80.6 <1.0 <1.0 51.5 3.71 DWMRC split sapiple <10 68 <20 <20 54 0.12 H 1st Qtr 3/18/2021 <1.0 64.9 <1.0 <1.0 55.6 4.62 2nd Qtr 6/17/2021 <1.0 63.9 <1.0 <1.0 54.7 6.25 3rd Qtr 9/22/2021 <1.0 60.2 <1.0 <1.0 42.5 4.33
Shaded indicates concentrations exceeding GWQS. H = Sample was analyzed beyond holding times and may not be accureate concentration.
TABLE 1 (31 of 33)
Historic Summary Of Monitoring Well Analytical Results Up To The 3rd Qarter 2021
Chloroform Contamination Investigation
DUSA White Mesa Mill
TW4-34
Sampling Event
Parameter
(GWQS)
Carbon Tetrachloride
(5 pg/L)
Chloroform
(70 pg/L)
Chloromethane
(30 pg/L)
Methylene Chloride
(5 pg/L)
Chloride
No GWQS (mg/L)
Nitrate, Nitrate + Nitrite
(10 mg/L)
4th Qtr 11/14/2013 <1 0 <1 0 _ 0 .<1 <1 0 19 2. 1 64 1st Qtr 1/23/2014 <1 0 <1 0 <1 0 <1 0 20 4 1 93 2nd Qtr 5/22/2014 <1 0 <1 0 <1 0 <1 0 17 9, 1 69 3rd Qtr 8/13/2014 <1 0 <1 0 <1 0 <1 0 18 1 10
4th Qtr 10/29/2014 <1 0 <1 0 <1 0 <1 0 17 8 1 16
1st Qtr 3/11/2015 <1 0 <1 0 <1 0 <1 0 17 7 1 21 2nd Qtr 6/11/2015 <1 0 <1 0 <1 0 <1 0 17 4 0 868 3rd Qtr 9/3/2015 <1 0 <1 0 <1 0 <1 0 15 1 0 458
4th Qtr 10/21/2015 <1 0 <1 0 <1 0 <1 0 15 8 0 368
1st Qtr 3/16/2016 <1 0 <1 0 <1 0 <1 0 17 3 0 925 2nd Qtr 5/25/2016 <1 0 <1 0 <1 0 <1 0 18 0 605 3rd Qtr 8/3/2016 <1 0 <1 0 <1 0 <1 0 17 2 0 726 4th Qtr 10/20/2016 <1 0 • <1 0 <1 0 <1 0 19. 0 612
1st Qtr 3/15/2017 <1 0 <1 0 <1 0 <1 0 18 0 0 674
2nd Qtr 6/15/2017 <1 0 <1 0 <1 0 <1 0 15 7 0 727 3rd Qtr 8/2/2017 <1 0 <1 0 <1 0 <1 0 19 8 0 733 4th Qtr 10/10/2017 <1 0 <1 0 <1 0 <1 0 18 5 0 774 Duphcate TW4-85 <1 0 <1 0 <1 0 <1 0 20 4, 0 784.
1st Qtr 3/14/2018 <1 0 <1 0 <1 0 <1 0 19 1 0 737
2nd Qtr 6/13/2018 <1 0 <1 0 <1 0 <1 0 19 5 0 877 3rd Qtr 8/29/2018 <1 0 <1 0 <1 0 <1 0 23 8 0 736 4th Qtr 12/12/2018 <1 0 <1 0 _ <1 0 <1 0 18 5. 0 889 1st Qtr 3/16/2019 <1 0 <1 0 <1 0 <1 0 17 9 0 859
2nd Qtr 6/13/2019 <1 0 <1 0 <1 0 <1 0 20 1 0 994
3rd Qtr 9/11/2019 <1 0 <1 0 <1 0 <1 0 17 8 0 934 4th ptr 12/14/2919 <1 0 <1 0 <1 0 <1 0 21 4 1 07 1st Qtr 3/17/2020 <1 0 <1 0 <1 0 <1 0 20 1 1 090 2nd Qtr 6/10/2020 <1 0 <1 0 <1 0 <1 0 20 9 1 240 3rd Qtr 9/17/2020 <1 0 <1 0 <1 0 <1 0 19 0 0 978
4th Qtr 11/4/2020 <1 0 <1 0 <1 0 <1 0 18 7, 1 04
1st Qtr 3/17/2021 <1 0 <1 0 <1 0 <1 0 19 3 1 09
2nd Qtr 6/16/2021 <1 0 <1 0 <1 0 <1 0 17 8 1 08
3rd Qtr 9/15/2021 <1 0 <1 0 <1 0 <1 0 15 0 1 1
TW4-35
3rd Qtr 8/27/2014 <1 0 <1 0 <1 0 <1 0 34 0 2 4th Qtr 10/28/2014 <1 0 • <1 0 <1 0 <1 0 34 A • 0.351
1st Qtr 3/11/2015 <1 0 <1 0 <1 0 <1 0 34 9 0 436
2nd Qtr 6/10/2015 <1 0 <1 0 <1 0 <1 0 35 2 0 452
3rd Qtr 9/3/2015 <1 0 <1 0 <1 0 <1 0 35 9 0 304
4th Qtr 10/28/2015 <1 0 <1 0 <1 0 <1 0 33 4 0 419 1st Qtr 3/16/2016 <1 0 <1 0 <1 0 <1 0 35 4 0 521
2nd Qtr 5/26/2016 <1 0 <1 0 <1 0 <1 0 35 4 0 631
3rd Qtr 8/3/2016 <1 0 <1 0 <1 0 <1 0 34 8 0 723
4th Qtr 10/20/2016 <1 0 <1 0 <1 0 <1. 0 • 3.7 1 . 0 626
1st Qtr 3/15/2017 <1 0 <1 0 <1 0 <1 0 33 7 0 673 2nd Qtr 6/15/2017 <1 0 <1 0 <1 0 <1 0 34 8 0 699 3rd Qtr 8/2/2017 <1 0 <1 0 <1 0 <1 0 36 3 0 670 4th Qtr 10/10/2017 <1 0 <1 0 <1 0 <1 0 31 7 0 651
1st Qtr 3/14/2018 <1 0 <1 0 <1 0 <1 0 37 4 0 740
2nd Qtr 6/13/2018 <1 0 <1 0 <1 0 <1 0 33 7 0 662
3rd Qtr 8/30/2018 <1 0 <1 0 <1 0 <1 0 39 3 0 527 4th Qtr 12/12/2018 <1 0 <1 0 <1 0 <1 0 43 0. 0 559 1st Qtr 3/16/2019 <1 0 <1 0 <1 0 <1 0 33 5 0 574
2nd Qtr 6/13/2019 <1 0 <1 0 <1 0 <1 0 35 5 0 670
3rd Qtr 9/11/2019 <1 0 <1 0 <1 0 <1 0 31 7 0 525
4th Qtr 12/14/2019 <1 p <1 o .... _ <1 o <1 o 37 4. 0 524 1st Qtr 3/17/2020 <1 0 <1 0 <1 0 <1 0 34 5 0 595 2nd Qtr 6/11/2020 <1 0 <1 0 <1 0 <1 0 34 0 0 699
3rd Qtr 9/17/2020 <1 0 <1 0 <1 0 <1 0 32 2 0 760
4th Qtr 11/4/2020 <1 0 <1 0 <1 0 . . <1 0 30 4. 0 756
1st Otr 3/17/2021 <1 0 <1 0 <1 0 <1 0 35 6 0 991
2nd Qtr 6/16/2021 <1 0 <1 0 <1 0 <1 0 34 1 1 01
3rd Otr 9/15/2021 <1 0 <1 0 <1 0 <1 0 27 5 1 2
TW4-36
3rd Qtr 8/27/2014 <1 0 <1 0 <1 0 <1 0 65 <0 1
4th Qtr 10/23/2014 <1 0 _ <1 0 <1 0.. <1 0 67 3 <0 1
1st atr 3/11/2015 <1 0 <1 0 <1 0 <1 0 67 2 <0 1
2nd Qtr 6/10/2015 <1 0 <1 0 <1 0 <1 0 69 3 <0 1 3rd Qtr 9/3/2015 <1 0 <1 0 <1 0 <1 0 76 4 <0 1

4th Otr 10/21/2015

. . <1 0 <1 0 <1 0 <1 0 64 5 <0 1
lst Qtr 3/11/2016 <1 0 <1 0 <1 0 <1 0 67 2 <0 1
2nd Qtr 5/26/2016 <1 0 <1.0 <1 0 <1 0 72 3 <0 1
3rd Qtr 7/28/2016 <1 0 <1 0 <1 0 <1 0 69 4 <0 1
4th Qtr 10/20/2016 <1 0 <1 0 <1 0 <1 0 73 8 <0 1 Duplicate TW4-70 <1 0 <1 0 <1 0 <1 0 72 <0 1 1st Qtr 3/15/2017 <1 0 <1 0 <1 0 <1 0 60 2 <0 1
2nd Qtr 6/15/2017 <1 0 <1 0 <1 0 <1 0 71 3 <0 1
3rd Qtr 8/2/2017 <1 0 <1 0 <1 0 <1 0 69 6 <0 1
4th Qtr 10/10/2017 <1 0 <1 0 <1 0 <1 0 62 9. 0 104 . 1st Qtr 3/14/2018 <1 0 <1 0 <1 0 <1 0 73 8 <0 1 2nd Qtr 6/12/2018 <1 0 <1 0 <1 0 <1 0 64 3 <0 1
3rd Qtr 8/29/2018 <1 0 <1 0 <1 0 <1 0 76 4 <0 1
41h Qtr 12/12/2018 <1 0 <1 0 <1 0 <1 0 65 8 0 12
1st Qtr 3/16/2019 <1 0 <1 0 <1 0 <1 0 65 0 116
2nd Qtr 6/13/2019 <1 0 <1 0 <1 0 <1 0 71 5 <0 1
3rd Qtr 9/11/2019 <1 0 <1 0 <1 0 <1 0 69 6 <0 1 41h Qtr 12/14/2019 <1 0 <1 0 <1 0 <1 0 73 7. <0 1 1st Qtr 3/17/2020 <1 0 <1 0 <1 0 <1 0 69 1 <0 1 2nd Qtr 6/11/2020 <1 0 <1 0 <1 0 <1 0 67 0 <0 1 3rd Qtr 9/17/2020 <1 0 <1 0 <1 0 <1 0 66 0 <0 1
lth Qtr 11/4/2929 • <1 0 <1 0 <1 0 <1. 0 • 64 0. <0.1
l 1 st Qtr 3/17/2021 <1 0 <1 0 <1 0 <1 0 72 5 <0 1
Qtr 6/16/2021 <1 0 <1 0 <1 0 <1 0 68 7 <0 1
1
2nd
3rd Qtr 9/15/2021 <1 0 <1 0 <1 0 <1 0 63 1 <0 1
Shaded indicates concentrations exceeding GWQS
TABLE 1 (32 of 33)
Historic Summary Of Monitoring Well Analytical Results Up To The 3rd Qarter 2021
Chloroform Contamination Investigation
DUSA White Mesa Mill
TIN4-37 (chloroform pumping well 6/9/15) Sampling Event
Parameter
(GWQS)
Carbon Tetrachloride
(5 pg/L)
Chloroform
(70 pg/L)
Chloromethane
(30 pg/L)
Methylene Chloride
(5 pg/L)
Chloride
No GWQS (mg/L)
Nitrate, Nitrate + Nitrite
(10 mg/L)
2nd Qtr 6/8/2015 18.2 30,200 15.7 1.94 345 35.2 3rd Qtr 9/3/2015 16.6 19100 13.7 1.04 374 32.4
4th Qtr 10/19/2015 _ _ 12.5 19,500 9.38 1.17 399 34.6
1st Qtr 3/9/2016 15.8 17,500 3.57 1.34 332 28.4
2nd Qtr 5/23/2016 14.4 16,200 3.57 1.17 389 27.9 3rd Qtr 7/25/2016 16.7 15,900 <1.0 <1.0 294 33.4 4th Otr 10/12/2016 16.3 16,400 <1.0 <1.0 304 26.1
1st Qtr 3/8/2017 15.4 18,000 3.57 1.34 305 • 32.3
2nd Qtr 6/15/2017 16.2 15,800 <1.0 <1.0 281 31.2
3rd Qtr 7/26/2017 15.1 15,000 <1.0 <1.0 277 30.5 4th Qtr 10/11/2017 12.6 15,500 2.47 <1.0 255 30.6
1st Qtr 3/12/2018 12.8 12,900 1.14 <1.0 263 30.0
2nd Qtr 6/8/2018 10.6 14,400 <1.0 <1.0 275 28.6
3rd Qtr 8/22/2018 12.1 14,100 6.2 <1.0 387 25.3
4th Qtr 11/28/2018 11.3 15 200 19.8 <1.0 264 27.3 ist Qtr 3/8/2019 13.8 13,300 1.24 <1.0 209 30.1 2nd Qtr 6/5/2019 146 16,200 <1.0 <1.0 250 31.2
3rd Qtr 9/4/2019 10.7 11,900 1.9 <1.0 228 25.8
4th Qtr 12/10/2019 8.81 13,100 3.12 <1.0 220 25.5 .................... 1st Qtr 2/19/2020 8.53 12,000 12.3 <1.0 236 28.3 2nd Qtr 5/27/2020 11.8 11,700 1.44 <1.00 321 28.3 3rd Qtr 9/4/2020 9.62 13,800 <1.0 <1.0 273 29.5 4th Qtr 10/28/2020 6.52 10 300 29.4 <1.0 254 28.7 ist Qtr 2/23/2021 <1.0 9,380 <1.0 <1.0 242 26.9
2nd Qtr 6/9/2021 8.46 13,000 1.98 <1.00 176 26.6
3rd Qtr 8/24/2021 7.65 10,200 <1.0 <1.0 220 25.8
TW4-38
4th Qtr 11/10/2016 <1.0 <1.0 <1.0 <1.0 40 11.2
1st Qtr 3/15/2017 <1.0 <1.0 <1.0 <1.0 35.7 10.6
2nd Qtr 6/15/2017 <1.0 <1.0 <1.0 <1.0 36.2 10.8 3rd Qtr 8/2/2017 <1.0 <1.0 <1.0 <1.0 36.9 10.1
4th Qtr 10/10/2017 <1.0 <1.0 <1.0 <1.0 31.3 10.3
1st Qtr 3/14/2018 <1.0 <1.0 <1.0 <1.0 36.5 9.34
2nd Qtr 6/13/2018 <1.0 <1.0 <1.0 <1.0 33.1 9.48
3rd Qtr 8/30/2018 <1.0 <1.0 <1.0 <1.0 39.2 7.77 4th Qtr 12/12/2018 <1.0 <1.0 <1.0 <1.0 ............. 35.0 ,.,. 8,,48
l st Qtr 3/16/2019 <1.0 <1.0 <1.0 <1.0 'SIB. ..6.46
2nd Qtr 6/13/2019 <1.0 <1.0 <1.0 <1.0 33.7 8.53
Duplicate TW4-70 <1.0 <1.0 <1,0 <1.0 35.3 9.52
3rd Qtr 9/11/2019 <1.0 <1.0 <1.0 <1.0 31.6 7.61 4th Qtr 12/14/2019 <1.0 <1.0 <1.0 <1.0 36 7.51 1st Qtr 3/17/2020 <1.0 <1.0 <1.0 <1.0 33.4 8.11
2nd Qtr 6/11/2020 <1.0 <1.0 <1.0 <1.0 34.9 9.00
3rd Qtr 9/18/2020 <1.0 <1.0 <1.0 <1.0 34.7 7.35
4th Qtr 11/4/2020 <1.0 <1.0 <1.0 <1.0 35.1 7.72
1st Qtr 3/18/2021 <1.0 <1.0 <1.0 <1.0 37,2 8.24 2nd Qtr 6/16/2021 <1.0 <1.0 <1.0 <1.0 37.7 9.59
Duplicate TW4-70 <1.0 <1.0 <1.0 <1.0 35.7 9.05 3rd Qtr 9/15/2021 <1.0 <1.0 <1.0 <1.0 32.1 8.04
TW4-39(cteceotorrn pumping well (11/2016)
4th Qtr 11/11/2016 <1.0 2 800 <1.0 <1.0 68.9 ............P.7 1st Qtr 3/8/2017 8.15 6,460 <1.0 1.35 130 6.44
2nd Qtr 6/15/2017 8.2 5,560 <1.0 1.31 120 6.25
3rd Qtr 7/26/2017 14.4 10,000 <1.0 1.5 132 7.74
4th Qtr 10/10/2017 <1.0 552 <1.0 <1.0 73.5 2.65
1st Qtr 3/12/2018 3.1 2,870 <1.0 <1.0 118 3.33 2nd Qtr 6/8/2018 7.94 7,160 <1.0 <1.0 107 4.84 3rd Qtr 8/22/2018 12.5 8,180 2.33 <1.0 110 6.05
4th Qtr 11/28/2018 6.08 6 520 2.33 <1.0 123 6.39
1st Qtr 3/8/2019 1.2 885 <1.0 <1.0 49 2.08
2nd Qtr 6/5/2019 11.6 8,640 <1.0 <1.0 114 8.45
3rd Qtr 9/4/2019 5.71 4,240 <1.0 <1.0 48.2 1.75
4th Qtr 12/10/2019 1.14 1 650 <1.0 <1.0 74.7 0.95 1st Qtr 2/19/2020 <1.0 812 <1.0 <1.0 76.5 0.792
2nd Qtr 5/27/2020 7.56 5,870 <1.0 <1.0 88.5 5.01
3rd Qtr 9/18/2020 8.18 5,960 <1.0 <1.0 63.2 2.69
4th Qtr 10/28/2020 <1.0 648 1.19 <1.0 83.2
1
7.03
1st Qtr 2/23/2021 <1.0 2,970 <1.0 <1.0 53.0 2.12 2nd Qtr 6/9/2021 7.56 2,490 <1.0 <1.0 123 12.0 3rd Qtr 8/24/2021 <1.0 858 <1.0 <1.0 78.7 2.70
Shaded indicates concentrations exceeding GWQS.
TABLE 1 (33 of 33)
Historic Summary Of Monitoring Well Analytical Results Up To The 3rd Qarter 2021 Chloroform Contamination Investigation DUSA White Mesa Mill
TW4-40 (chloroform pumping well 5/2019)
Sampling Event
Parameter
(GWQS)
Carbon Tetrachloride
(5 pg/L)
Chloroform
(70 pg/L)
Chloromethane
(30 pg/L)
Methylene Chloride
(5 pg/L)
Chloride
No GWQS (mg/L)
Nitrate, Nitrate + Nitrite
(10 mg/L)
1st Qtr 3/21/2018 <1.0 248 <1.0 <1.0 35.7 3.08
2nd Qtr 6/13/2018 <1.0 131 <1.0 <1.0 31.6 3.33 3rd Qtr 9/5/2018 <1.0 116 <1.0 <1.0 37.6 3.22 4th Qtr 12/12/2018 <1.0 118 <1.0 <1.0 29.9 3.54 Ditplicate TW4-75 <1.0 119 <1.0 <1.0 32.3 3.18 MiafOir 3/20/2019 <1.0 111 <1.0 <1.0 ----6:.§. Y.vi
-2nd Qtr 6/5/2019 <1.0 263 <1.0 <1.0 35.6 3.55 3rd Qtr 9/4/2019 <1.0 380 <1.0 <1.0 35.9 3.39 • 4th Qtr 12/10/2019 <1.0 314 <1.0 <1.0 36.7 • 2.89 ........... 1st Qtr 2/19/2020 <1.0 364 <1.0 <1.0 38.5 .2.98
2nd Qtr 5/27/2020 <1.0 367 <1.0 <1.0 36.5 2.91
3rd Qtr 9/4/2020 <1.0 333 <1.0 <1.0 34.2 2.88 4th Qtr 10/28/2020 <1.0 264 <1.0 <1.0 34.6 2.58 ............... 1st Qtr 2/23/2021 <1.0 436 3.51 <1.0 36.0 2.43
2nd Qtr 6/9/2021 <1.0 343 <1.0 <1.0 27.5 3.77
3rd Qtr 8/24/2021 <1.0 301 1.32 <1.0 31.8 1.50
TVV4-41 (chloroform pumping well 5/2018)
2nd Qtr 5/8/2018 <1.0 1,400 <1.0 <1.0 42.8 6.54
3rd Qtr 8/22/2018 <1.0 1,390 <1.0 <1.0 45.5 6.13
4th Qtr 11/28/2018 <1.0 1,320 <1.0 <1.0 41.4 6.02 ............ 1st Qtr 3/8/2019 <1.0 1,220 <1.0 <1.0 39.1 6.71 2nd Qtr 6/5/2019 <1.0 1,320 <1.0 <1.0 38.1 6.00 3rd Qtr 9/4/2019 <1.0 1,190 <1.0 <1.0 39.4 6.22
4th Qtr 12/10/2019 <1.0 1,410 <1.0 <1.0 42.1 6.11
1st Qtr 2/19/2020 <1.0 1,200 <1.0 <1.0 44.4 6.12
2nd Qtr 5/27/2020 <1.0 1,220 <1.0 <1.0 41.7 6.78 3rd Qtr 9/4/2020 <1.0 1,110 <1.0 <1.0 40.2 6.69 4th Qtr 10/28/2020 <1.0 1,020 <1.0 <1.0 39.7 6.25 .............. 1st Qtr 2/23/2021 <1.0 1,170 <1.0 <1.0 40.6 6.41 2nd Qtr 6/9/2021 <1.0 1,130 <1.0 <1.0 39.5 7.45 3rd Qtr 8/24/2021 <1.0 1,100 <1.0 <1.0 37.1 3.77
TW4-42
2nd Qtr 6/19/2019 <1.0 <1.0 <1.0 <1.0 23.3 2.57 3rd Qtr 9/11/2019 <1.0 <1.0 <1.0 <1.0 20.6 2.75 4th Qtr 12/10/2019 <1.0 <1.0 <1.0 <1.0 22.6 2.82 01plicate TW4-75 <1.0 <1.0 <1.0 <1.0 22.6 2.95 -1st Qtr 2/17/2020 <1.0 <1.0 <1.0 <1.0 23.2 2.88
2nd Qtr 6/10/2020 <1.0 <1.0 <1.0 <1.0 23.1 3.23
3rd Qtr 9/17/2020 <1.0 <1.0 <1.0 <1.0 23.5 3.65 4th Qtr 11/4/2020 1st Qtr 3/17/2021
<1.0
<1.0 <1.0 <1.0 <1.0 <1.0 <1.0 <1.0 22.4 ...........:. .24.2 2.77 """"""- 3.15 2nd Qtr 6/15/2021 <1.0 <1.0 <1.0 <1.0 24.6 3.57 3rd Qtr 9/15/2021 <1.0 <1.0 <1.0 <1.0 16.6 3.26
Shaded indicates concentrations exceeding GWQS. (2) Chloroform puming well stated in May 2019.
Table 2
Summary of EFR QA/QC Samples
3rd Quarter 2021
Duplicate Samples of Wells
Parameter GWQS Duplicate of TW4-3 Duplicate of 11N4-8 Duplicate of MW-32
TW4-3 TW4-65 RPD TW4-8 TW4-70 RPD MW-32 TW4-75 RPD
Chloride none 20.3 20.7 -2.0 40.8 43.1 -5.5 34.3 35.5 -3.4
Nitrate + Nitrite (as N) 10 mq/L 5.28 6.19 -15.9 0.665 0.59 12.0 <1.0 <1.0 nc
Chloroform 700/L <1.0 <1.0 nc 17.0 16.4 nc <1.0 <1.0 nc
Carbon tetrachloride 5 uq/L <1.0 <1.0 nc <1.0 <1.0 nc <1.0 <1.0 nc
Chloromethane 30 pq/L <1.0 <1.0 nc <1.0 <1.0 nc <1.0 <1.0 nc
Methylene Chloride 5 uq/L <1.0 <1.0 nc <1.0 <1.0 nc <1.0 <1.0 nc
nc = not calculated
Tabel 3
Chloroform Mass Removal Calculations for the 3rd Qurater 2021
EFR White Mesa Mill, Bland, Utah
Well ID MW4 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 TW4-41
(1)Chloroform (ug/L) 1,140 1,580 821 1,150 1,100 2,600 4,450 669 3,510 103 1.34 10,200 858 301 1,100
Chloroform (g/L) 1.14E-03 1.58E-03 8.21E-04 1.15E-03 1.10E-03 2.60E-03 4.45E-03 6.69E-04 3.51E-03 1.03E-04 1.34E-06 1.02E-02 8.58E-04 3.01E-04 1.10E-03
Chloroform (lbs/L) 2.52E-06 3.49E-06 1.81E-06 2.54E-06 2.43E-06 5.74E-06 9.83E-06 1.48E-06 7.76E-06 2.28E-07 2.96E-09 2.25E-05 1.90E-06 6.65E-07 2.43E-06 Chloroform (lbs/gal) 9.53E-06 1.32E-05 6.87E-06 9.62E-06 9.20E-06 2.17E-05 3.72E-05 5.59E-06 2.94E-05 8.61E-07 1.12E-08 8.53E-05 7.18E-06 2.52E-06 9.20E-06
Total gallons pumped 89693.5 27945.6 8677.2 12694.5 12021.0 1560.8 157632.4 93390.4 22272.5 53333.1 82802.3 49987.5 31436.6 58841.0 13821.0
lbs of chloroform rernoved 0.9 0.4 0.06 0.12 0.1 0.03 5.9 0.5 0.7 0.046 0.00 4.3 0.2 0.15 0.1
Gallons of chloroform removed 0.07 0.03 0.00 0.01 0.01 0.00 0.48 0.04 0.05 0.004 0.00 0.35 0.02 0.01 0.01
total lbs of chloroform removed 13.4
total gallons of chloroform removed 1.1
1) Assuming that the chloroform concentration result for the quarter monitoring event is the average chloroform concentration for the entire quarter.
Chloroform Pumping Wells
Nitrate Pumping Wells AB = Abandonded Well