DRC-2021-021642 - 0901a06880fc8aef

MEMORANDUM
/1/5124)2(
pr2-
Department of
Environmental Quality
Kimberly D. Shelley
Executive Director
DIVISION OF WASTE MANAGEMENT
AND RADIATION CONTROL
Douglas J. Hansen
Director
t;•tiA
State of Utah
SPENCER J. COX
Governor
DEIDRE HENDERSON
Lieutenant Governor
TO:
FROM:
DATE:
SUBJECT:
D 1 C- 2021-02(A-2
Phil Goble
Dean Henderson
November 15, 2021
Review of the Aug 17, 2021 2nd 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 August
17, 2021 2nd 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 2nd Quarter Report to be submitted to the Division on or before September
1, of each year. The Report was received by the Division on August 20, 2021 (date of Report
August 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 TW4-13 TW4-21
TW4-9 TW4-14 TW4-22
TW4-10 TW4-16 TW4-23
TW4-11 TW4-18 TW4-24
TW4-12 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 summffly of the
2nd 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 diyness 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
TW4-38 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 2nd Quarter 2021 is 11.8 lbs. (see Table 3 below) which is less than the estimated 16.8 lbs.
removed in the 1st Quarter 2021. The lesser mass removal is a primarily due to decrease 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 784 lbs. in the 2nd Quarter, 2021. This
approximately 489 lbs. lesser than the 1st Quarter 2021 estimated mass of 1,273 lbs.
As per Part III.B.2 of the GCAP, the electronic files were used in 2nd 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 µg/1 in the 2nd 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 701.1g/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 2nd 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 [tg/L ("GWQS = 70 µgip
with the exception of TW4-30 (78.7µg/L). This well have exceeded the chloroform GWQS for the third
consecutive quarterly monitoring event (4th quarter 2020, 1st quarter 2021 2nd 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. This As-Built report is currently under review.
Performance Monitor Wells ("PM") [Wells Exceeding Chloroform Concentrations GWQS of 70µg/L1
Eight (8) PM wells still exceed 70 tig/L: TW4-7, TW4-9, TW4-10, TW4-16, TW4-26, TW4-29, TW4-
30, and TW4-40.
Compliance Monitor Wells ("CM") [Wells with Chloroform Concentrations between < 1 and 70vg/L]
Six (6) CM wells range with detectable chloroform concentration but still below 70µg/L: TW4-5, TW4-
6, TW4-8, TW4-18, TW4-27 and TW4-33.
CM Wells Below the Laboratory Chloroform Detection Limit (<1.0 lig/L)
Fourteen (14) CM wells were below the laboratory detection limit for chloroform (<1.0 gg/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 2nd 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 pig/L) chloroform concentration (see table 1 below).
Nitrate, Nitrate + Nitrite ("nitrate") Concentrations
Pumping wells TW4-22 (89.3 mg/L) and TW4-24 (48.0 mg/L) exceed the nitrate GWQS of 10 mg/L.
These nitrate exceedances appear to be a result of the nitrate contaminant plume up-gradient of the
chloroform contaminant plume. This nitrate contaminant plume is being addressed under the Nitrate
Corrective Action Plan ("NCAP"), approved on December 12, 2012.
Well TW4-26 (14.2 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. In addition, nitrate concentrations at TW4-40 are currently at 3.77 mg/l.
Page 6
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 (23.8 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 2nd quarter 2021
below the nitrate GWQS of 3.59 mg/L, 4.19 mg/L, and 0.45 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 August 17, 2021, 2nd
Quarter, 2021 Chloroform Monitoring Report for the chloroform contamination investigation.
References
Page 7
EFRI, State of Utah Stipulated and Consent Order ("SCO") Docket Number UGW-20-01 White
Mesa Mill — Energy Fuels Resources (USA) Inc. ("EFRI") Plan and Time Schedule, Revision 1,
Pursuant to Part II.H.2 of the Groundwater Corrective Action Plan ("GCAP") included as
Attachment 1 to the SCO, January 10, 2018.
EFRI Quality Assurance Plan ("QAP") June 23, 2018 (Revision. 7.4)
EFRI issued Ground Water Quality Discharge Permit No. UGW370004. Permit version that was
signed on March 19, 2019.
EFRI, White Mesa Uranium Mill, 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)
EFRI, 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
Tables 1 through 3
TABLE 1 (1 of 31) Historic Summary Of Monitoring Well Analytical Results Up To The 20d Darter 2021
Chloroform Contamination Investigation DUSA White Mesa Mill
MW-4 (rtmomfartm Panama 'rt. started (Among 3/.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 -1- Nitrite (10 mg/L) 1st Qtr 3/16/2005 NA 2,900 NA NA NA 6.3
2nd Otr 5/25/2005 NA 3.170 NA NA NA 7.1 3rd Qtr 8/31/2005 <10 3,500 <10 010 NA 7.0
050 Ippo <50 <50 53 7.0 41 tsht 1:0:11ttrr 12/7/2005 3/9/2006 <50 -3,100 <50 <50 49 8.0 2nd Qtr 6/14/2006 <50 3,000 <50 <50 49 6.0 3r4 Qtr 7/20/2006 <50 2,820 <50 <50 48 1.2
41h Qtr 11/8/2006 2.1 2,830 1.4 <1.0 50 6.4 1st atr 2/28/2007 1.6 2,300 01.0 <1.0 47 6.3 2nd QV 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 41h Qtr 10/10/2007 1.7 ........./X19 <1.0 <1.0 45 6.2 1st QV 3/26/2008 1.7 2.400 <1.0 <1.0 42 5.8 2nd Qtr 6/25/2008 1.8 2.500 <1.0 <1.0 42 6.1 3rd QV 9/10/2008 1.8 1,800 <1.0 <1.0 35 6.4 10/15/2008 1.7 2,100 01.0 01.0 45 5.9 4ltst
h
oQttrr 3/4/2009 1.5 2,200 <1.0 <1.0 37 5.7
2nd Qtr 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 01.0 43 5.3 4th Qtr 12/14/2009 1.6 1,800 <1.0 <1.0 44 5.8 1st Qtr 2/17/2010 1.2 1,600 41.0 <1.0 45 4.0 2nd Qtr 6/14/2010 1.2 2,100 01.0 <1.0 41 5.1 3rd Qtr 8/6/2010 1.5 1,900 <1.0 <1.0 38 4.8 10/15/2010 1.4 ,590 ,1 < .0 <1.0 41 4.9 41 tsht
01
Qttrr 2123/2011 1.5 1,700 1 <1.0 <1.0 40 4.6 2nd Qtr 6/1/2011 1.4 1,700 <1.0 <1.0 35 4.9 3rcl Qtr 8/17/2011 1.1 1,700 <1.0 <1.0 41 4.9 4th Qtr 11/16/2011 1.3 1,600 <1.0 <1.0 4 5.1 Tifiltr (1) 1/23/2012 1 1,500 <1.0 <1.0 41.00 4.8
2nd Qtr 6/6/2012 1.2 1,400 <1.0 <1.0 39.0 4.9 3r1 Qtr 9/4/2012 1.5 1,500 <1.0 <1.0 41.0 5.0 4th Crtr 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 01.0 37.8 4.78 2nd Qtr 6/5/2013 1.31 1,490 <1.0 <1.0 44.0 4.22 3rd Otr 9/3/2013 1.13 1,520 <1.0 <1.0 41.4 4.89
4th Qtr 10/29/2013 5.58 1.410 <1.0 <1.0 40.1 5.25 1st Qtr 1/27/2014 4.15 1,390 01.0 01.0 38.5 4.7 2nd Qtr 5/19/2014 5,21 1,390 01.0 <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 01.0 01.0 40.7 5.75
2nd Qtr 6/8/2015 <1.0 1,300 01.0 <1.0 43.1 2.53 3r4 Qtr 8/31/2015 <1.0 1.200 1.42 <1.0 44.3 4.79
4t5 Qtr 10/19/2015 01.0 200 _.1. <1.0 <1.0 40,8 ..1:43 1st Qtr 3/9/2016 <1.0 1.240 01.0 01.0 42.2 5.10 2nd Qtr 5/23/2016 1.44 1.580 01.0 <1.0 43.7 4.54 3rd Qtr 7/25/2016 <1.0 1,430 <1.0 <1.0 42.5 4.95 10/12/2016 1.24 1470 <1.0 <1.0 44.8 4.88 41 tsth oittr 3/8/2017 1.22 1,450 01.0 <1.0 43.3 4.99 2nd Qtr 6/13/2017 1.15 1,430 01.0 <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
WHM0Rtr 3/12/2018 04P1444 Ist '15 1.07 1,400 <30 <1.0 70 J <1.0 43.0 46.2 5 .1 4.47 1,320 2nd Qtr 6/8/2018 <1.0 1240 <1.0 <1.0 43.5 4.64 3rcl Qtr 8/22/2018 <1.0 1,300 01.0 <1.0 48.5 4.55 41h Qtr 11/28/2018 <1.0 1,330 <1.0 ...., <1.0 - 43.1 4.44 151 Qtr 3/8/2019 <1.0 1,190 <1.0 01.0 41.5 5.05 2nd Otr 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 12/10/2019 <1.0 1 370 01.0 <1.0 45.5 4.34 4ltsht otQtrr 2/19/2020 01.0 1,230 01.0 <1.0 48.1 6.22
2nd Qtr 5/27/2020 <1.0 1,250 <1.0 01.0 40.7 5.04
310 Qtr 9/4/2020 01.0 1,240 <1.0 <1.0 43.8 4.93
4111 oQttrr 10/18/2020 2/23/2021
<1.0 <1.0 1,050 <1.0 <1.0 <1.0 <1.0
41.4 46.5 4.62 4.61 1,150
2nd Ott* 8/9/2021 <1.0 1,320 <1.0 <1.0 34.6 6.48
-4ArrW 1st Qtr 3/12/2005 NA 3,700 NA NA NA 7.1 2nd Qtr 5/25/2005 NA 3,740 NA NA NA 7.8 3161Qtr 8/31/2005 <10 3,800 <10 <10 NA 6.9
12/7/2005 <50 la_00 <50 <50 55 6.7 41 tsht 0Qttrr 3/9/2006 <50 3,700 e50 <50 53 5.8
2nd QV 6/14/2006 <50 3,300 <50 <50 54 7.3 3rd Qtr 7/20/2006 <50 3,190 <50 <50 54 1.2 11/8/2006 2.4 1.9 _AFC 2.500 <1.0 01.0 <1.0 <1.0 6540 7.1 7.1 41 tsht QQttrr 2/28/2007 Well abandonded
(1) As of March 2011 L.
(2) chloroform pumping wells 1VV4-1, TW4-2 and TW4-11 started in 1/14/15
NA.. not analyzed
Shaded indicates concentrabons expending GWQS
Bold and takos mdmates the MDL exceeded the GWQS.
J = Approxrtnated value
TABLE 1 (2 of 31) Historic Summary Of Monitoring Well Analytical Results Up To The 2nd Qarter 2021
Chloroform Contamination Investigation DUSA White Mesa Mill
MW-26 yom. 116/ 4-15) Chieretcurn pump., wey Malted 0111/03 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) 1s1 Qtr 2nd Qtr 3rd Qtr 41 t
s t
h t: I
Q tt rr
2n4 Qtr 3rd Qtr 41 tsht oOttrr
2nd Qtr 3rd Qtr
3/16/2005 5/25/2005 8/31/2005 12/7/2005
319/2006 6/14/2006 7/20/2006 11/8/2006 2/28/2007 8/27/2007 8/15/2007 10/10/2007
NA NA <5.0 <50 <50
<50 <50 <1.0 <1.0 <1.0 <1.0 <1.0
310 442 960 1,000 1
I ,
,
. I 1 ;
1
1
1
'
,:
',,
3
4
?i
,4
-7,:
:::
'
,7
'
;,'-,•
•7
1,.,'Vs'-;•
7
7
7'.:-,;
;
;;
;
."c','

NA NA <5.0 <50
<50 <50 <50 2.6 5.5 13 38 14 40 53 24
100
NA NA NA
55 52 52 65 54 56 49 57
57 9 4 57 44 64 NA NA
0.3 0.2 0.2 0.3 ............... 0.2 0.2 1.4 0.3 0.6 04 1 0.8 0.1 0.6 0.2 0.1
0.4 0.2 0.1 2.3 0.2 6.8 0.6 0.7
NA
1,100 830 2,170 282 570 300 1,400 2 000 930 1,300 830
1,700
41 ts th QO tt rr
2nd Qtr 3rd Qtr 4t6 Qtr
3128/2008 6/25/2008 9/10/2008 10/15/2008 11/18/2008
<1.0 <1.0 <1.0 NA <2.0 <1.0 <1.0 <10
<1.0 <1.0 1.2 <1.0 <1 0
NA
1st Qtr 2nd Qtr 3rd Qtr 41 ts th QQ tt rr
2nd Qtr 3rd Qtr 4th Car
3/4/2009 6/23/2009 9/14/2009 12/14/2009 2/17/2010 6/14/2010 8/16/2010 10/15/2010
950 410 850 1,100
51 12 30 40 18
21 8.5
49 48 46 60 57 40 49 65
730 1,600 2,200 970
< .0
151 Qtr 2nd Qtr 3rd Otr 4th Otr
..._.(1) 1st CO (2)
25d Qtr 3rd Qtr 41h Qtr 1st QV 2nd Qtr 3rd Qtr 4ltsth aQttrr
2nd Cdr 3rd Qtr 41h Otr 1st Qtr 2nd Qtr (3)
3n4 Qtr 4th Qtr
2/23/2011 5/31/2011 8/17/2011 11/16/2011 12/5/2011
<1.0 <1.0 <1.0 NA <1.0 NA
450 1.800 720
lap_
<1.0 <1.0 <1.0 NA <1.0 <1.0
<1.0 <1 <1 <1 <10 <1.0 <1 <1.0 <1.0
<1.0 <1.0 <1.0
<1.0 <1.0
8.7
4.05 1.32
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
57 88 58 69 NA 98
73 73 68 81.9 77.9 60.5 72.3 59.4 53.4 59 60.1
NA
0.5 0.4 09 2.0
1.7
2.5 2.6 1.8 2.27 2.11
1.18 1.38 0.55 0.93 0.7
..-....._SN 0.73 0.42
0.68 0.991
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
<1.0
<1.0 <1 <1
2 400
3.000 3.100 1,200 <1 <1.0 <1.0 <1.0 <1.0 <1.0 <1.0 <1.0 41.0 <1.0
<1.0 <1.0
2,120 4,030 2.940 1 410 1,460 1,960 2,120 2,090 1,980 1,980
2,350 2,680
27.4 11.2
11.6 8.28
56.5 62
69.6 62.6 1st Citr 2nd Qtr 3rd Qtr 4th Qtr (4)
1st Qtr 2nd Qtr 3rd Qtr 41 ts th QQ tt rr
2nd Qtr 3r01 Qtr 4th Qtr 1st Qtr 2nd Otr 3rd Qtr 41 ts th QQ tt rr
2rtd Qtr 3rd Qtr 41 tsht QQ tur
2nd Qtr
3/9/2016 5/23/2016 7/25/2016 10/12/2016
3/8/2017 6/13/2017 7/26/2017 0/11/2017 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 8/8/2021
<1.0 <1.0 2,650 2,220 4.66 4.57 68.3 66.2 1.45 1.12
<1.0 3,190 <1.0 7.81 66.4 1.57 <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
<1.0
<1.0 <1.0 <1.0 <1.0 <1.0 <1.0 <1.0 <1.0 <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
88.2
58.4 64.3 61.4 62.2
1.18
0.768 0.922 1.56 1.18 1,210 1,870 1.680 1.480 <1.0 <1.0
<1.0 <1.0
<1.0
2.14 9.19
2.2 1.18 1.93 1.78
2.57
60.3 58,7 91.4
6859. 80.7 78.2 83.2 88.9 35.1 70 37.4
1.57 0.901 2.80 1.96 1.85 2.83 3.08 0,977 1.17 2.93 0.42 3.62
<1 0 <1,0 <1.0 <1.0 <1.0 <1.0 <1.0 <10
1,110 1,280 1,680 1,390 1.100 1.140 1,130 866 <1 0 <1 0 3.060 998 <1.0 <1.0 <1.0 3.46 59.5 48.6 0.349 0.81 (1) VOCs were resarnpled because laboratory rntssed holcIng trrne (2)A, of March 2012 both r, 4.34:Florefnern o"rorcirn7 .'21242,:vlirlis14/4437-1 stIVrt411noWne1W:14/ 4 started 1 /14/13 NA . not anal 10;7'9- Shaded indtcabas concentrator's exceeding GWOS. Sold and egos indtcates 0r MM. exceeded the MA/OS
TABLE 1 (3 of 31)
Historic Summary Of Monitoring Well Analytical Results Up To The 2nd Qarter 2021
Chloroform Contamination investigation DUSA White Mesa Mill
MW-32 pormeTwarT) Sampling Event Parameter (GWQS)
Carbon Tetrachloride
(5 pg/L)
Chloroform
(70 pg/L)
Chloromethane
(30 pg/L)
Methylene Chloride
(5 itg/L)
Chloride
No GWQS (mg/L)
Nitrate, Nitrate + Nitnte
(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 41 tsht QQtt rr <1 0 <1 0 <2 00 . _ <111 1312/79//22000065 <<11 00 -3323 <1 0 <1 0 - - 2nd Qtr 6/14/2006 <1 0 <1 0 3 5 <1 0 30 <0 1 3r4 Qtr 7/20/2006 <1 0 <1 0 1 8 <1 0 32 <1 0 4th Qtr _ < <1 0 31 < 1 151 Qtr 11/88//220067 00
<11
1., (0/. <1 0 <1 0 1 5 <1 3 <1 0 32 <1 0 2nd Qtr 6/27/2007 <1 0 <1 0 <1 0 <1 0 32 <1 0
3r4 Qtr 8/15/2007 <1 0 <1 0 <1 0 <1 0 31 <1 0
4th Qtr <1 0 <1 0 <1 0 32 _ <1 0
1st Qtr
103 //2108/r22000076 <<11 0
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
<1 0 _ 4
ltst
h
QQttr
il _ 10/31/45//22000089 <<11 00
<411 00 <1 0
<<11 00
2360. :01.05 _
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
12/16/2009 <1 0 <1 0 41 t
s
ht QQtt
r
r
2/17/2010 <1 0
<<11 00
<1 00 <1 0 — :<<30-11
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
4t0 qtr 0 <1 0 <1 0 <1 0 24 <0 1
1st atr
10v/2153//22010
1 01 <<110 <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
ell 12/7/2011 <1 0 <1 0 <1 0 <1 0 NA _ NA 1st-Qtr12) 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 <1 0 <1 0 41 tsht clOtt rr 10v/110v/22001123 <<11 00 <1 0 <1 0 <<11 00 34335 «<00 11 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 ii ....Q_ 35 7 <0 1 . 1st Qtr 1/29/2014 <1 0
00 <11
<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
41 tsth QQttr
r 130//2
197/1
22001145 <2 00 <1 0
<1 0 4 < 11 0 0
<1 0 <<0 1
<1 0
346 9
3 3 0 1
2nd Qtr 6/11/2015 <1 0 <1 0 <1 0 <1 0 35 8 <0 1
3nd Qtr 9/9/2015 <1 0 <1 0 <1 0 <1 0 37 7 <0 1
41 t
s t
h c tr Q t
t r
103//228
2//22001165i11 00 <1 0
<1 0
<1 0
<1 0 <<11 00
3346 77 4<30 11
Duplicate 1W4-70 <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
31d Qtr 8/19/2016 <1 0 <1 0 <1 0 <1 0 35 7 <0 1 <1 0 <1 0 <1 0 41 tsh Q t Q tt rr 1031/3211/122001167 <<11 00 <1 0 <1 0 <1 0 336 9 3 7 <<00 11
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 4117 oQttrr 130//1162//22001178 <1 0 <2 00 <<11 00 _ 3329 : 1 li_ _ 00 <<ll <1 0 geplante 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
<1 0 <1 0 0 32 S <0 1 41 ts
ht QQ tt
t
r 103//2199/2
/2001186
<11 00 < <1 0 <1 0
01 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
12/18/2019 <1 0 <1 0 <1 0 <1 0 41 t
s
ht
cl
Qtt
r
r
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
4t5 Qtr 11/4/2020 <1 0 <1 0 <1 0 <1 0 31 3 <0 1 Daatter TW4-65 3/18/2020 <1 0 <1 0 <1 0 <1 0
<1 0 _ 11 <1 0 — 4<11 00 - 3365 98_3)
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 1W4-75 <1 0 <1 0 <1 0 <1 0 34 3 <0 1
(i> VOCs were resernpled because laboratory missed holding erne (2) As of March 2012 both north nd south wrld Irfe ponds no Ion er recervIng water
NA not analyzed
Shaded indicates concentrabons exceeding GWOS
TABLE 1 (4 of 31) Historic Summary Of Monitoring Well Analytical Results Up To The 25d Qarter 2021 Chloroform Contamination investigation DUSA White Mesa Mill
TW4-1(cnioroform pumping well started in 1 /14/15)
Sampling Event
Parameter
(GWQS) Carbon Tetrachloride
(5 P9/L)
Chloroform (70 pg/L) Chloromethane (30 pg/L) Methylene Chloride
(5 P90-)
Chloride No GWOS (mg/L) Nitrate, Nitrate -I- Nitrite (10 mg/L) 1st Qtr 3/16/2005 NA 2700 NA NA NA 9.1 2nd Otr 5/25/2005 NA 3.080 NA NA NA 10.6 3rd Qtr 8/31/2005 <10 2,900 <10 <10 NA 9.8 12/7/2005 050 _1400 <50 <50 52 9.7 41 t
s
ht
oQttrr 3/9/2006 <50 2,700 <50 050 49 9.4 2nd Qtr 6/14/2006 <50 2,200 050 <50 48 9.6 3rd Qtr 7/20/2006 <50 - 2,840 <50 <50 51 41 ilt QC I tt r 11/572000607 1.4 1.2 2,260 <1.0 <1.0 <1.0 <1.0 7 447 9.2 8.9 1,900 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 41 ts 10/10/2607 1.3 2,000 <1.0 <1.0 43 7.8 th 00 tt rr 3/28/2008 1.3 2,000 <1.0 <1.0 39 7.6 2nd Otr 6/25/2008 1.1 1.900 <1.0 <1.0 39 8.68 3rd Otr 9/10/2008 1.3 1,700 <1.0 <1.0 35 8.15 41 1st: (3Qttrr 10/15/2008 3/11/2009 1.3 1.1 1 700 ..._.., 1.700 <1.0 <1.0 <1.0 <1.0 4371 9.3 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 12/29/2009 <1.0 1 400 <1.0 <1.0 6.8 .. . 4113th atQtrr 3/3/2010 <1.0 1,300 <1.0 <1.0 4351 7.1 20d Otr 6/14/2010 1.2 1,600 <1.0 <1.0 40 6.8 3rd Qtr 8/18/2010 1 1,600 <1.0 01.0 35 6.7 4ltsht (3Q tt rr 10/15/2010 2/24/2011 <1.0 <1.0 1,500 1,300 <1.0 <1.0 <1.0 <1.0 4401 8.6 6.6 2nd Qtr 6/1/2011 <1.0 1.200 <1.0 <1.0 35 6.6 3rd Qtr 8/18/2011 4Qtr 11/29/2011 <1.0 <1.0 1,300 1 500 <1.0 <1.0 <1.0 <1.0 36 6.8 6.6
,.
th
firail2)- 1/24/2012 <1 0 1 300 <1.0 <1.0 Vi B8
2nd Qtr 6/14/2012 <1.0 1,000 <1.0 <1.0 42 7.1 3r4 Otr 9/28/2012 <1.0 1,000 <1.0 <1.0 39 5.0 <1.0 1,100 <1.0 <1.0 40 6.5 41h Otr 101/4/2001123 1st v Qtr 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 Crir 9/3/2013 <1.0 1 150 <1.0 <1 0 37.6 7.12 11/14/2013 <1 0 1,280 _ <1.0 <1.0 7.08 4115th Qattrr 2/5/2014 5.47 1,090 <1.0 <1.0 36. 5 38.9 7.74 2nd Qtr 5/23/2014 4.77 1,020 <1.0 <1.0 37.4 6.93 31d Qtr 8/27/2014 <1.0 845 1.4 <1.0 38 4.80 41h Qtr 10/29/2014 <1.0 1,140 <1.0 <1.0 38.7 6.31
1st 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 <1.0 1040 <1.0 <1.0 38.5 1.55 41 ilt 10/19/2015 (3011 rr 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 3rd Otr 7/25/2016 <1.0 1.160 <1.0 <1.0 44.7 5.49 41h Otr 10/13/2016 <1.0 1,330 <1.0 <1.0 44 1 0.746 1st Qtr 3/8/2017 <1.0 519 <1.0 <1.0 41.5 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 41h Qtr 10/11/2017 <1.0 556 <1.0 <1.0 38.5 5.78
DW.t.,83.0 s.ir_8n 1.8 <7.6 23 J 04..5174 fsi Oh' 3712/2018 <1.0 7801.04 <411.0 <1.0 454.25
2nd Qtr 6/8/2018 <1.0 942 <1.0 <1.0 429 4.38 3rd Qtr 8/22/2018 <1.0 1.010 <1.0 <1.0 47.3 4.30 41h Qtr 10/22/2018 <1.0 752 <1.0 <1.0 43.2 4.57
D
l
split stsga
st
WMORtrC 3/8/2019 <5.0 210 <5.0 <5.0 NA 0.46 <1.0 87.2 . <1.0 40.9 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 12/10/2019 <1.0 1,070 <1.0 <1.0 44.2 3.91 4113th 04Qrr 2J19/2020 <1.0 1,190 <1.0 <1.0 47.5 4.67 2nd Gig 5/27/2020 <1.0 499 <1.0 <1.0 48.4 0.44 3rd Qtr 9/4/2020 <1.0 1,080 <1.0 <1.0 43.7 2.22 10/28/2020 <1.0 924 <<11..00 <1.0 <1.0 41.9 .....___ 45.4 -21.1 41 tsth (3Q tt rr 2/23/2021 <1.0 2n4 Otr 6/9/2021 <1.0 957 <1.0 <1.0 37.2 0.73
of March 2012 both north and south veild life ponds no Ion er recevInvater.
-; 1'W4-1 concerted to a chlorofontputhea well started in 1/14/15
131 chloroform pularnuvell TW4-41 started In MIr 2018
SIA = not analyzed
Shaded thdicates concentratons exceeding 0WC1S.
Bold and Sacs indicates the MDL exceeded the WADS.
./ x. Approximated value
TABLE 1 (5 of 31)
Historic Summary Of Monitoring Well Analytical Results Up To The 20d Qarter 2021
Chloroform Contamination Investigation DUSA White Mesa Mill
TW4-2 (chloroform purnpng vrell starung114,15)
Sampling Event
Parameter
(GWQS) Carbon Tetrachloride
(5 pg/L)
Chlorofonn
(70 pg/L)
Chloromethane
(30 pg/L)
Methylene Chloride
(5 PO-)
Chloride
No GWQS (mg/L)
Nitrate, Nitrate -i- Nitrite
(10 mg/L) 1st Qtr 3/16/2005
2nd Qtr 5/25/2005 3,4 Qtr 8/31/2005
4th Qtr 12/7/2005 1s1 Qtr 3/9/2006
2nd Qtr 6/14/2006
3,4 Qtr 7/20/2006
11/8/2006 41 tsht oQttir 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 6/25/2008
3r4 Qtr 9/10/2008
41h Qtr 10/15/2008
11/118
1//22000089 1st Qtr
2n4 Qtr 6/23/2009
3rd Qtr 9/14/2009
I 12/29/2009
NA
NA <10
<50
<50
<50
<50
NA
2.3 1.8 2.5 2.2 2.1 2.3 2.2
2.4
2.4
2.2
2
2
#NIA
3,700 3,750 3,900
1500
3:8-60
3,200
4,120
3,420 2,300 3,000 340 3,200 3.300 3,100
2800
.1200
3,100
2.800
3.000
1,600
NA NA <10
<50 <50
<50
<50
<1.0
NA NA <10
<50 <50
<50
<60 01.0
NA NA NA 56
56
56 54 55 ,4 50 49 51 48 46 42 47 NA 46 44 43
46
01/A
7.7 8.6 8 0 7.8
.....7:
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
6.8
8.7
6.6
7.0
6.8
6.0
7.0
7.1
7.7 4.0 7.6
8.1 7.51
9.3 8.39
7.87
9.11
6.2 8.45
5.32
4.3
3.76
5.18
5.30
5.67
4.07
6.07
4.74
4.90
5.08 3.25 4.00 5.00 2.94 3.50 4.83 3.52 3.92 4.38 4.79 3.40
6.07
3.62
3.35
2.34
3.30 3.89
<1.0 <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
3.6
2.6
<1.0 <1.0 <1.0 <1.0
<1.0 <1.0 <1.0 NA <2.0
<1.0
<1.0 <2.00
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0 <1.0 <1.0
<1.0
<1.0
<<11.0
.0
<1.0
<1.0 <1.0
<1.0
<1.0
<1.0 <1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0 <1.0 <1 0 <1.0 <1.0 <1.0 <1.0
_ 41 t
st
h
o
r: tt
r
r
3/3/2010
2nd Qtr 6/14/2010
3rd Otr 8/18/2010
41: oOttrr 10/15/2010
2/24/2011 2nd Qtr 6/2/2011
3rd Qtr 8/17/2011 4t8 Qtr 1/29/2011 fit Oir ar 1/24/2012
2nd Qtr 6/14/2012 3r4 Qtr 9/4/2012
10/4/2012
2.6
2.5
2.1
2,600
3,300
3,300
MOO
3,100
3,000
2,400
_1_900 2 500
2,500 2,900
LISID
3,560
3,110
3,480
3240 -3,180
2,930
3,170 3,580
1,840
1,650
1,060
2,07p.
1.970
2,070 1,780 1,600
42
43
43
48
42
48
4499
52 76 49
2.4
2.2
1.6
2.8 2
2.1 1.8 4
lts
ht
ot
Qt
r
r
2/13/2013
2n4 Qtr 6/19/2013
3rd Qtr 9/3/2013
4th Oh 11/2114/20013
otr 1st 14
2nd Qtr 5/23/2014
3rd Otr 8/27/2014 4th Qtr
10/ 1st Qtr (2) 33/09/122001145
2nd Qtr 6/8/2015
3,4 Qtr 8/31/2015
41 t
s
ht oOttrr 10/19/2015 3/9/2016
2nd Otr 5/23/2016 3rd Qtr 7/25/2016 4th Qtr 10/12/2016
<1.0
<1.0
<1.0 <1.0
5.17
2.65
2.41
3.15
7.1
6.05
1.4 2.6
1.44
2.6
1.2 1.49
68 J 60 J
46 46.9
44.9
43.9
45.9
45.4
45 45.5
44.9
48.1
50
41.9
43.4
43.8
42.9
44.3
43.1
43.6
43.2 43.5 44 43 44.4 41.3 44.3 41.7 40.4 39.8 40.8
41.5
42.1
40.6
41.3
38.7
43.3 32.5
1s1 Qtr 3/8/2017 2nd Qtr 6/13/2017 3rd Qtr 7/26/2017 41h Qtr 10/11/2017 DINMRC spItt maniple DWMRC &Ocala TW4-50 1st Qtr 3/12/2018 29d QV 618/2018 3ri1 Qtr 8/22/2018 10/22/2018 41 t
sth QQttir 3/8/2019
2nd Ott 6/5/2019
3rd Qtr 9/4/2019
4111 c2
Qtt
r
r 12/10/2019
2/19/2020
2n4 Qtr 6/10/2020
3r4 Qtr 9/4/2020 4th Qtr 10/28/2020 1st Qtr 2/23/2021 2nd Qtr 6/9/2021
<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
1,570 1,940 1,310 1.610 1,200 1,200 764 949 980 822
<1.0 <1.0 <1.0 <16
<1.0 <1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0 <1.0 <1.0
<1.0 <1.0 <1.0 <1.0 <1.0 <1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
1,040 1.360 797
934
1,880
1,070
1,260 1,130 939 1,160 <1.0 <1.0 (1) As of March 2012 0010 north and south wild Irte ponds no long. rec
12.L1W4-2 and 1W4-11 converted to a cNoroformjunza well started in 1 (14/15
NA and eN/A(for graph use)n not analyzed Shaded indicates concentrasons exceeding GWOS. Elold and italics indicates the MIX exceeded the GWOS J Approomated value
TABLE 1 (6 of 31) Histonc Summary Of Monitoring Well Analytical Results Up To The 20d fluter 2021
Chloroform Contamination investigation
DUSA White Mesa Mill
1W4-3
Samphng Event Parameter (GWOS) Carbon Tetrachloride
(5 pg/L)
Chlorofonn
(70 pg/L)
Chloromethane
(30 pg/L)
Methylene Chloride
(S Ka.)
Chloride
No GWOS (mg/L)
Nitrate, Nitrate .0 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 3nd Qtr 8/31/2005 <1 0 <1 0 6 4 <1 0 NA 3 5 4th Qtr 5 <1 0 <1 0 <1 0 26 /A _ lst Qtr 12/7;2200008 <11 0 4 0
<1 0 2 3 41 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 4 It Q Qtt rr 1 2/112/88;00220067 0 4 <11 0 <1 0 <1 0 <11 ° < 0
2 1 5 <1 ° 0 223 3 1 2nd Qtr 6/27/2007 <1 0 <1 0 <1 0 <1 0 23 3 3 3r4 Qtr 8/15/2007 <1 0 <1 0 <1 0 <1 0 24 3 1 4th Qtr <1 0 _ 51 0 <1 0 27 _ 2 13, 1st Qtr 103;2108;22000078 4,11 00 --<-1 0 <1 0 <1 0 21 2 8 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 r 44; c2tQtr 10/31/54;220008 09 <1 0 41 0 <1 0 <1 0 <1 0 <1 0 1 0 22
21
2 6 :1 0 2 5 2nd Qtr 6/23/2009 <1 0 <1 0 <1 0 <1 0 20 2 9 3r1 Qtr 9/14/2009 <1 0 <1 0 <1 0 <1 0 21 2 8 4t5 Oh' 12/29/2009 <1 0 <1 0 2 6 1st Qtr 2/23/2010 <1 0 <11 ° < 0 <1 0 < 0 <1 1 0 2 223 2 8 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 4tsth Qtr lQtr 10;111/22001 101 2 1 0 :10 _ <1 0 <1 0
<1 00
1 0 2236 3 3 - 3 5 2nd Qtr 5/25/2011 <1 0 <1 0 <1 0 <1 0 23 3 7 3rd Qtr 8/17/2011 <1 0 <1 0 <1 0 <1 0 23 4 0 4t0 Qtr 11/14/2011 <1 0 <1 0_ _ «10 «1 0 .. 23 44 is( thr (2) 1/17/2012 <1 0 --<1 0 <1 0 <1 0 21 7 1
2nd Qtr 5/31/2012 <1 0 <1 0 <1 0 <1 0 24 4 4 3rd Qtr 8/28/2012 <1 0 <1 0 <1 0 <1 0 25 4 9 4th Qtr 10/3/2012 2/7/2013 <1 0 <1 0 1 0 <1 0
-- 23257- -.5101 1st Qtr 4<11 00
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 4t5 •Qtr <1 0 0 5 89 1st Qtr 11/1/8/220013 14 <11 0 4 0 <1.0 41 0 <1 0 11 0 244 1 2 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 <1 0 <1 0 26 7 6 07 41 th r
st QQttr 10//2131;22001148 3
<110 4 0
<1 0
<4100
1.

<1 0 26 2 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 Qtr 8/13/2015 <1 0 <1 0 <1 0 <1 0 27 4 3 88 4th Qtr <1 0 <1 0 5 37 1st Qtr
103/2
18
1;22001185 <411 00
<1 0 <1 0
00 :11 2325 68
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
41h Qtr 0 <1 0 <1 0 5 6 00 1st Qtr 130//119/2001167
4/2 4<11 0 <1 0 110 0 <1 0 281 6 18 2nd Qtr 6/14/2017 <1 0 <1 0 <1 0 <1 0 28 7 6 36 3rd Qtr 7/27/2017 <1 0 <1 0 <1 0 <1 0 28 5 6 36 Duplicate TW4-65 <1 0 <1 0 <1 0 <1 0 28 9 6 24 4th Qtr <1 0 25 9 6 32 1st Qtr "3//1114/2/2001178 <<1.1 00 00 :11 <11 03 29 8 6 46 Duplicate TW4-85 <1 0 <1 0 <1 0 <1 0 29 5 6 31 2n4 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 146cete TW4-65
3/13/2019
<1 0 <1 0
< <11 00
12
st Qtr
<1 0
<1 0 26 2 25 5 5 77 <1 0 <1 0 5 82 2nd Qtr 6/13/2019 <1 0 <1 0 <1 0 <1 0 27 4 6 68 Duplicate TW4-65 <1 0 <1 0 <1 0 <1 0 25 9 6 60 3rd Qtr 9/11/2019 <1 0 <1 0 <1 0 <1 0 26 0 5 12 Duplicate TW4-65 <1 0 <1 0 <1 0 <1 0 22 1 5 76 12/12/2019 <1 0 <1 0 28 41 tsht
r
r QQtt
3/17/2020 <1 0 <1 0
00 4<11 00 :11
27 7 5 3151 6 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
Noted% TW4-65 <1 0 <1 0 <1 0 <1 0 26 7 6 63
3r51 Otr 9/17/2020 <1 0 <1 0 <1 0 <1 0 25 9 6 36
<1 0 0 24 9 6 02 4il
t
r Qttr 1
Q
/4;220201 31/1102 7
<11 0 4 0
<1 0
<11 0 4 0 410 28 4 6 19 Duplicate 1W4-65 <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
NA = not analysed Shaded indicates concentrabons meadow GWQS
TABLE 1 (7 of 31) Historic Summary Of Monitoring Well Analytical Results Up To The 20d Qarter 2021
Chloroform Contamination investigation DUSA White Mesa Mill
T1N4-4 (dun.ry pump, we sterna r 1st otr 2010)
Sampling Event
Parameter
(GWOS)
Carbon Tetrachloride
(9 Pg/L)
Chlorofomi
(70 WA-)
Chloromethane
(30 pg/L)
Methylene Chloride
(5 pg/L)
Chloride
No GWOS (mall.)
Nitrate, Nitrate . Nitrite
(10 mg/L)
lst 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 3r3 Qtr 8/31/2005 <10 3,200 <10 <10 NA 9.9 12/7/2005 41 tsht QQttr
r <50 _g,100 <50 <50 54 10.2 3/9/2006 <50 2,900 <50 <50 51 9.5
2nd 08 6/14/2006 <50 2,600 <50 450 48 8.6
3r4 Qtr 7/20(2006 <50 2,850 <50 <50 50 9.7 4th Qtr 11/8
1st Qtr 8/2/20006 07
1.7 2,670 <1.0 <1.0 49 10.1 1.5 2.200 <1 0 <1.0 49 9.0 2nd Otr 6/27/2007 1.7 2,400 <1.0 <1.0 47 9.4 314 Qtr 8/15/2007 1.5 2,700 <1.0 <1.0 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 2.800 <1.0 <1.0 43 9.2 25d Qtr 6/25/2008 1.5 2,500 <1.0 <1.0 42 10.8 3rd Qtr 9/10/2008 1.4 2,200 01.0 <1.0 39 8.8 4th Qtr 10/15/2008 NA 8N/A NA NA 44 10.1 1st Qtr 11/18/2008 <2.0 .2,,500 <2.0 <2.0 NA 1st Qtr 3/4/2009 1.2 .2,200 <1.0 <1S 37 10.2
20d Qtr 6/23/2009 1.2 1,800 <1.0 <1.0 34 8.2
3rd Otr 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 l 1,700 <1.0 <1.0 48 6.6 2nd Qtr 8/14/2010 1.2 1.700 <1.0 <1.0 35 7.6 3r4 Qtr 8/10/2010 1.3 2,100 <1.0 <1.0 36 7.3 10/15/2010 1.3 1,700 <1.0 <1.0 38 7.1 41 tsht 010tt/r 2/23/2011 1.4 1,800 <1.0 <1.0
2nd Qtr 6/1/2011 1.2 1,700 <1.0 <1.0 35 7.0 3rd Qtr 8/17/2011 <1.0 1.500 <1.0 <1.0 40 6.6 dth Otr 11/16/2011 l 1,500 <1.0 <1.0 39 7.0 TiratICIT- 1/23/2012 <1.0 1,200 <1S <1.0 38 7.1
2nd Otr 8/6/2012 <1.0 1,500 <1.0 <1.0 43 7.1 3rd Qtr 9/4/2012 1.2 1,600 <1.0 <1.0 39 7.1 41 tsht Car v10113/21/2001123 1,400 <1.0 <1.0 <1. 38 7.0 1.460 <1.0 39 7.36 2nd Qlr 6/29/2013 <1.0 1.330 01.0 <1.0 39.6 6.30 3rd Qtr 9/3/2013 1.2 1.380 <1.0 <1.0 38.8 7.22 5.3 1„60 8 <1.0 <1.0 4th otr 101//2232//22001143 1st Qtr 3.88 1,260 <1.0 <1.0 37.4 - 7.28 2nd Qtr 5/19/2014 4.94 1,220 01.0 <1.0 47.5 5.91 3rd Qtr 8/11/2014 4.94 1.320 7.1 <1.0 40 5.3
4t8 Otr 10/21/2014 <1.0 1.130 01.0 <1.0 40 7.02
1st Qtr (4) 3/9/2015 1.05 1,350 01.0 <1.0 37.6 7.7 2nd Qtr 6/10/2015 <1.0 1,280 01.0 <1.0 41.3 6.33 3rc1 08 8/31/2015 <1.0 1,220 1.72 01.0 45.8 6.45 10/19/2015 <1.0 <1.0 38.5 6.27 4411 QQttrr 3/9/2016 <1.0 11 :1191 00 «<11 . . <1.0 39.7 8.7 2nd Otr 5/23/2018 1.21 1.780 <1.0 <1.0 41.9 6.56 3rd Qtr 7/27/2016 <1.0 1,380 01.0 <1.0 40.2 7.22 10/13/2016 01.0 1,430 <1.0 <1.0 6.77 41 tsht QQtt rr 3/8/2017 <1.0 1,290 <1.0 <1.0 41. 7 40. 3 6.87 2n4 Otr 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 10/111/2001178 <<11.0 .0 1 120 <1.0 <1.0 40.7 sntdQottr 3/ 21 1,160 <1.0 <1.0 42.2 66..910 2 , 13) 8/8/2018 01.0 1,050 01.0 <1.0 39.0 6.34
3rd Qtr 8/22/2018 <1.0 1,030 <1.0 <1.0 44.6 6.10 4111 QQttrr 11/28/2018 3/8/2019 <1.0 <1.0 1,140 <1.0 <1.0 <1.0 <1.0 41.4 38.3 8.02 7.26 1,050 2nd Qtr 6/5/2019 <1.0 1,070 01.0 <1.0 38.5 10.40 3rd Qtr 9/4/2019 <1.0 989 <1.0 <1.0 39.4 6.32 12/10/2019 4ltsth (2%r 2/19/2020 01.0 1,140 01.0 <1.0 <1.0 <1.0 40.4 43.4 6.52 4.58 01.0 1,100 2n4 Otr 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 41h Qtr 10/28/2020 <1.0 979 <1.0 38.6 6.77 1st Otr 2/23/2021 <1.0 1,130 <1.0 <11 .0 < .0 39.8 6.75 2nd Otr 6/9/2021 <1.0 1,240 <1.0 <1.0 39.4 9.02
(1) As of March 2912 both north and south wid ffe ponds no loer recervinlwater
1211W4-4 converted to a Chlortiforruienzu well stared inlet iE 231
(3.LTW4-41 installed as a Chloroform puraft, well stared in Mly 2018
14.0W4-2 converted to a chloroforruumzu well started in 1/14/15 NA and eN/A(for graph use) n- not analyzed Shaded indicates concentrations exceeding GWOS. Bold and italics indicates the MDL exceeded the GWQS.
TABLE 1 (8 of 31) Historic Summary Of Monitoring Well Analytical Results Up To The 2nd Qarter 2021
Chloroform Contamination Investigation
DUSA White Mesa Mill
TW4-5 Sampling Event Parameter (GWQS)
Carbon Tetrachloride
15 p9/14
Chloroform
(70 pg/L)
Chloromethane
(30 pg/L)
Methylene Chloride
(5 pg/L)
Chloride
No GWQS (mg/L)
Nitrate, Nitrate 4- 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 3r4 Qtr 8/31/2005 <2.5 82 5.8 <2.5 NA 6.0 41 tsth QQttrr 12/7/2005 3/9/2008 <2.5 <2.5 63 66 2.5 3.1 <2.5 56 52 tc, 6.0 <2.5 2nd Qtr 6/14/2006 <2.5 51 3.1 <2.5 51 5.9 3r4 Qtr 7/20/2006 <1.0 53.7 <1.0 <1.0 54 6.7
i 11/8/2006 <1.0 47.1 <1.0 <1.0 55 2.9 4113 tt rr th c0C 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
3r4 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
3/28/2008 <1.0 11 <1.0 <1.0 36 7.4
2n4 Otr 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
3r4 Qtr 9/14/2009 <1.0 12 <1.0 <1.0 48 8.3
4th OS 12/29/2009
1st Qtr 2/25/2010
<1.0
<1.0
81.53 :11..00 <1.0 <1.0 41 43 7.5 6.8
<1.0 12 <1.0 <1.0 28 7.1 23 n
rci
d 6/14/2010
01
Q ttr
r
8/11/2010 <1.0 12 <1.0 <1.0 38 7.0 4t5 Qtr 10/15/2010
1st Qtr 2/22/2011
<1.0 <1.0 1 10 1 411.60 < <1.0 <1.0 41 34 7.2 7.0
2nd Qtr 5/26/2011 <1.0 9 <1.0 <1.0 35 7.2 3rd Qtr 8/7/2011 <1.0 10 <1.0 <1.0 37 7.5 415 Qtr 11/16/2011 NA A NA NA 30 6.0
(1) 12/7/2011 <1.0 7.9 <1.0 <1.0 NA 5N/A -fit War 1/18/2012 <1.0 7.6 <1.0 <1.0 22 i-ii
2nd Qtr 6/6/2012 <1.0 8.4 <1.0 <1.0 39 8.0
3rd Qtr 9/11/2012 <1.0 12.0 <1.0 <1.0 37 8.1
<1.0 8.0 <1.0 <1.0 38 7.7 41 t
s
10/4/2012
t
h Q0 tt
r
r
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 Otr 9/5/2013 <1.0 11.6 <1.0 <1.0 39.1 7.79
41 t
st
h oQtt
r
r 111//3130//22001143 14.4 12.5 <1.0 <1.0 <1.0 41.1 40.5 ..7,75 9.16 <2..00 <1.0
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 41h Qtr 10/13/2014 <1.0 14.6 <1.0 <1.0 45.1 8.31 1st Qtr 3/12/2015 <1.0 136 <1.0 <1.0 45.1 9.32 Duplicate 1W4-70 <1.0 13.8 <1.0 01.0 46.4 8.81 2nd Qtr 6/10/2015 <1.0 13.3 1.07 <1.0 47.3 7.08 3r4 Qtr 9/10/2015 <1.0 12.9 <1.0 <1.0 52.2 8.1 41h Otr 10/28/2015 <1.0 11.0 <1.0 <1.0 4 6 8.03 1st Qtr 3/17/2016 <1.0 11.0 <1.0 <1.0 434..7 10.2 2nd Qtr 5/23/2016 <1.0 13.6 <1.0 <1.0 45.9 8.98 3r4 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
;Iholtrw4-75 3/15/2017 <1.0 <1.0
12.0
12.6
<1.0
<1.0 <1.0 <1.0
49.5
44.7
8.34
8.49 2nd Qtr 6/15/2017 <1.0 14.6 <1.0 <1.0 47.3 8.52 3n4 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 splilsample ,T)WMRC <0.19 12 <63 <0.32 47 8.6 lst Qtr 3/12/2018 <1.0 15.2 <1.0 <1.0 51.2 8.36 2n4 Qtr 6/13/2018 <1.0 13.9 <1.0 <1.0 47.3 9.24
3rd Otr 8/30/2018 <1.0 15.4 <1.0 <1.0 54.7 7.34
Duplicate 1W4-70 <1.0 15.3 <1.0 <1.0 55.9 7.28
4t5 Qtr 11/28/2018 <1.0 15.6 <1.0 <1.0 49.8 7.67
Duplicate TW4-70 <1.0 16.2 <1.0 <1.0 48.5 7.80
1st Oh 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
3r4 Qtr 9/11/2019 <1.0 14.6 <1.0 <1.0 46.1 7.04
Duplicate TW4-70 <1.0 13.6 <1.0 <1.0 45.8 6.89
41h Qtr 12/14/2019 <1.0 15.7 <1.0 <1.0 53.1 6.97
DeOldate TW4-70 <1.0 16.0 <1.0 <1.0 52.5 7.29
lst OS 3/17/2020 <1.0 14.8 <1.0 <1.0 48.3 7.10 Duplicate TW4-70 <1.0 14.8 <1.0 01.0 48.4 7.72 2nd Qtr 6/11/2020 01.0 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 i st Otr 3/1/8/2021 15.6 12.9 <1.0 <1.0 <1.0 <1.0 50,2 46 AAP, 7.43 <1. 0 <1.0 2nd Otr 6/16/2021 <1.0 13.0 <1.0 <1.0 50.8 8.11
(1) VOCs wore rawarnpled because laboratory missed holdng tam (2) As of March 2012 both north and south wild lee ponds no longer recemniwater
/31chlorcifon, arzfrigzsill 1W4-39 startod n 11120116 NA and 014/Affor graphs) = not analned Shaded indicates concentrations exceeding GWOS.
TABLE 1 (9 of 31)
Historic Summary Of Monitoring Well Analytical Results Up To The 2nc1 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 Otr 5/25/2005 NA 2.5 NA NA NA 0.4 3rd QV 8/31/2005 <1.0 10 2.8 <1.0 NA 0.8

r 12/7/2005

41 tht 010r 3/9/2006 s <1.0 <1.0 17 31 1.3 <1.0 <1.0 32 31 01..9 2 <1.0 2nd Qtr 6/14/2006 <1.0 19 <1.0 <1.0 30 1.0 3rd QV 7/20/2006 <1.0 11 <1.0 <1.0 37 0.6 4th Otr 11/8/2006 <1.0 42.8 <1.0 <1.0 6 32 5 1.4 1.8 1st Qtr 2/28/2007 <1.0 48 <1.0 <1.0 2nd Qtr 6/27/2007 <1.0 11 <1.0 <1.0 38 0.6 3rd Otr 8/15/2007 <1.0 18 <1.0 <1.0 36 0.7 4111; oQttrr 10/10/2007
3/28/2008
<1.0
<1.0
18
52
<1.0
<1.0
<2
.
.00 35
33
8
1.1-
2nd Qtr 6/25/2008 <1.0 24 <1.0 <1.0 35 0.9
3rd QV 9/10/2008 <1.0 39 <1.0 <1.0 35 1.1
10/15/2008 <t o 37 <1.0 <1.0 1.0 41 t
s
ht
01
Ott
r
r
3/4/2009-Z1.0 81 <1.0 <1.0 33 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
4t5 Qtr 12/29/2009 <1.0 250 <1.0 <1 0 41 6.1
1st Otr (6) 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 41h Qtr 10/15/2010 <1.0 420 <1.0 <1.0 41 4.3 1st Qtr 2/22/2011 <1.0 47 <1.0 <1.0 40 0.7 20d Qtr 5/26/2011 <1.0 9.6 <1.0 <1.0 42 0.3 3r4 Qtr 8/7/2011 <1.0 16 <1.0 <1.0 39 0.3 4th Qtr 11/16/2011 NA #N/A NA NA as 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 1st 0tr IC 1/18/2012 <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 Otr 9/11/2012 <1.0 6.9 <1.0 <1.0 21 0.1
4th QV 9 6.89 <1.0 <1.0 <1.0 <1.0 404.41 0.2 0.2 v101/43/t22001123
1st Otr
<<11.00
2nd Qtr 6/13/2013 <1.0 4.88 <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 11/13/2013 <1.0 5.51 <1.0 <1.0 40.2 1.5 tt 41 tsht (20 if 1/29/2014 <1.0 5.7 <1.0 <1.0 40.6 0.2
2nd Qlr 5/22/2014 <1.0 10.3 <1.0 <1.0 37 0.3
3rd QV 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 ....6.8 1st Car 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 Otr 9/10/2015 <1.0 1,040 <1.0 <1.0 47 6.8
41 t
st
h oOtt
r
r 103//29/2001165 <2..00 843
115r<1.0
<1.0 <1.0
<1.0 42.23 40. 63.7.69
2nd Otr 6/8/2016 <1.0 488 <1.0 <1.0 44.1 3.19
31d Qtr 7/27/2016 <1.0 433 <1.0 <1.0 42.2 3.85
415 Otr 10/26/2016 <1.0 301 <1.0 <1.0 48.1 3.74
1st Otr 3/16/2017 <1.0 288 <1.0 <1.0 42.1 3.15
2nd Qtr 8/21/2017 <1.0 239 <1.0 <1.0 42.6 2.42 3rd 01r 8/8/2017 <1.0 129 <1.0 <1.0 42.9 1.71 4t5 Qtr 0/11/2017 <1.0 121 <1.0 <1.0 s-•
<1.0 37.6 1.71 1st QV 3/20/2018 <1.0 159 <1.0 4 3 .1 1.96
2nd QV (6) 6/14/2018 <1.0 74.9 <1.0 <1.0 40.2 1.48
3rd Otr 9/5/2018 <1.0 53.2 <1.0 <1.0 44 1.18
415 Otr 12/12/2018 <1.0 37.0 <1.0 <1.0 20.0 ,c)..,PP 1st Qtr 3/19/2019 <1.0 23.2 <1.0 <1.0 41 ....0.755
2nd QV 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 <1.0 7.4 <1.0 <1.0 45.7 0.244 4
1151
12/14/2019 oCitt
r
r
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 3r4 Qtr 9/18/2020 <1.0 3.6 <1.0 <1.0 40.5 0.144 4th Qtr 11/4/2020 1st Otr 3/18/2021 <1.0 <1.0 4.61 3.78 <1.0 <1.0 <1.0 <1.0 42.9 41.6 00..213075 2nd Qtr 6/16/2021 <1.0 2.9 <1.0 <1.0 43.8 0.215
(1) VOCs were resarnpled because laboratory ressed holding time.
(2) Results of the 1W4-70 the duplicate sem* for 1V14-6.
(3) Reanalyzed for VOCs only. (4) As of March 2012 both norm and south wild Ate ponds no longer recemnzwater
ISLCNoroforre Lumputrival 1W4-4 stared in lst.alr 2010
16) ChloroforrnaunwIng.well TW4-41 installed Ma/2018
NA and ON/Affor grephs) not analyzed Shaded indicates concentrations exceeding GWOS
TABLE 1 (10 of 31)
Historic Summary Of Monitoring Well Analytical Results Up To The 2nd garter 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 IVA 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 00 NA 5.2 12/7/2005 41 t
st
h <50 2,500 <50 <50 52 5.3 QOttrr 3/9/2006 <50 1,900 550 <50 48 1 2nd Qtr 6/14/2006 <50 2,200 <50 <50 47 4.5 3rd Qtr 7/20/2006 <60 2,140 050 <50 51 4.7 11/8/2006 1.5 2 160 <1.0 <1 0 4.6 41 tsth QC! ttrr 2/28/2007 1.1 1,830 <1.0 <1.0 4 479 6 2nd Qtr 6/27/2007 1.5 2,800 <1.0 <1.0 45 5.1 3r4 Qtr 8/15/2007 1,4 2,300 <1.0 <1.0 44 4.7 1.2 1 900 <1.0 <1.0 45 4.7 4th Qtr103/t2180//2200007 1st Qtr 0 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 0N/A NA NA 40 4.01 11/18/2008 <2.0 2,590 <2.0 <2.0 NA 0N/A 1st Qtr 3/11/2009 1.2 1,800 <1.0 <1.0 2nd Otr 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 12/29/2009 <1.0 1 300 <1.0 <1.0 37 4.2 i tt r 4111; 0C1 2/25/2010 <1.0 1 200 <1.0 <1.0 35 3.8 2nd Qtr 8/14/2010 <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 i7lIcatOtrr _ 1 ottrig _ 1 100 1 300 <1.0 <1 0 38 45 3.46 :11..g. _ 0 <1.0 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 41h Qtr 11/29/2011 <1.0 1 000 <1.0 10._........... 37 3.8 1st Otr (1) 1/19/2012 <1.0 1 000 ....._<..< <1.0 7.0 i 37 ...1.1
2nd OR 6/14/2012 <1.0 - 7911 <1.0 <1.0 41 4.0 3rd Qtr 9/13/2012 <1.0 870 <1.0 <1.0 ao 3.8

r 10/4/2012

4111 oQttr 2/13/2013 1 <1.0 <1.0 940 940 <1.0 <1.0 <1.0 <1.0 374.71 '.9.51 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 01.0 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 Qtr 10/30/2014 <1.0 926 <1.0 <1,0 40.2 3.68 Lth
Qtr (2) 3/18/2015 <1.0 942 <1.0 <1.0 40.4 4.25 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 48.7 4.72 4th Otr 10/29/2015 <1.0 847 <1.0 <1.0 40.8 3.49 1st Qtr 3/22/2016 <1.0 834 <1.0 <1.0 42.4 4.43 2nd OR 8/8/2016 <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 41h 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 8/21/2017 <1.0 988 <1.0 <1.0 43.3 4.15 3rd Qtr 8/4/2017 <1.0 070 <1.0 <1.0 44.7 4.20 4th Otr 10/11/2017 <1.0 884 <1.0 <1.0 43.7 4.35
DWMRC splitte_ 890 <12 17 J 42.0 4.30 1st Qtr 3/21/2018 <7 .6 <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 3ril Qtr 9/6/2018 <1.0 781 <1.0 <1.0 48.5 4.34 41h Qtr 12/13/2018 <1.0 838 <1.0 <1.0 42.8 3.98 151 Qtr 3/20/2019 <1.0 738 <1.0 01.0 41.3 4.01 2nd OR 6/19/2019 <1.0 882 <1.0 <1.0 43.0 4.19 3rd Otr 9/12/2019 12/18/2019 <1.0 <1.0 801 546 748
<1.0 <1.0 <1.0 <1.0 . 42.1
3.76 3.11 3.75 4ltsht QC)tuf 3/18/2020 <1.0 <1.0 <1.0 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
0WMRC sktlittemp..4, <10 930 <20 <20 43 3.90 1st Qtr 3/24/2021 <1.0 875 <1.0 <1.0 46.2 4.25 2ncl OP 6/17/2021 <1.0 819 <1.0 <1.0 41.7 4.80
of March 2012 both north and south mid life ponds no longer receivnLvater
choroloem atnjth.uvells TWA1 and 1W4-2 started in 1/14/15
NA and ittllit(for amahs) w not anahmed Shaded indicates concentrabons exceeding GW00. Bold and itahcs indicates the MD/. exceeded the GWQS. J Approximated value
TABLE I (11 of 31)
Historic Summary Of Monitoring Well Analytical Results Up To The 2nd Qarter 2021
Chloroform Contamination investigation
DUSA White Mesa Mill
TW441
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 -1- Nitrite
(10 mg/L)
1s1 Qtr 3/16/2005 NA 10 NA NA NA <0.1
2n4 Qtr 5/25/2005 NA <1.0 NA NA NA 0.2
3r4 QV 8/31/2005 <1.0 1.1 1.7 NA NA <1.0 41 ts th QC at rr 12/7/2005 3/9/2008
<1.0 <1.0
1.3 <1.0
<1.0 41
39 <1.0 0.3 <1.0 2.1 <1.0
20d Qtr 6/14/2006 <1.0 1.8 1.0 <1.0 37 <1.0
3rd Otr 7/20/2006 <1.0 <1.0 <1.0 <1.0 39 0.1
<1.0 <1.0 <1.0 <1.0 <.1 41 t
s
ti
t
r 11/8/2006

Q.Q tt
r

2/28/2007 <1.0 2.5 <1.0 <1.0 4390
0.7
2n4 Qtr 6/27/2007 <1.0 2.5 <1.0 <1.0 42 0.2
3r4 Qtr 8/15/2007 <1.0 .1.5 <1.0 <1.0 42 <1.0
<1.0 3.5 <1.0 <1.0 0.5 411 r 10/10/2007
1

(3
0r
3/28/2008 <1.0 <1.0 <1.0 <1.0 443
0 0.1
204 Qtr 6/25/2008 <1.0 <1.0 <1.0 01.0 45 <1.0 •
3rd Qtr 9/10/2008 <1.0 <1.0 <1.0 <1.0 39 <0.05
<1.0 <1.0 <1.0 <1.0 44 <0.05 41 t
s
It; 10/15/2008
t
h QC
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
12/17/2009 <1.0 <1.0 <1.0 <1.0 51 <0.1 41 t
st
h (3
Citt
i
r
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 . 10/15/2010 41 t
s
ht c2
C1 t
tr
r
2/16/2011
<1.0
<1.0
<1.0 <1.0 <1.0 <1.0 <1.0 <1,0 „ , 4562 (3.1 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 0.21
(1) 12/7/2011 <1.0 <1.0 <1.0 <1.0 NA /A isfeitr (3) 1/18/2012 <1.0 - <1.0 <1.0 5 0.3)
2nd Qtr 5/13/2012 <1.0 <1.0 <1.0 <1.0 44 0.2
3rd Cltr 8/29/2012 <1.0 <1.0 <1.0 <1.0 48
<0.1 " I .1 4
111ci
Citt
r
r 10/3/2012
2/7/2013
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
47
46.6 0.41
2nd Qtr 5/30/2013 <1.0 <1.0 <1.0 <1.0 45.5 <81
3rd Qtr 9/5/2013 <1.0 <1.0 <1.0 <1.0 47.5 0.1
<1 0 <1 0 <1 0 <1 0 46 1 <0.1 41 t
,
11/7/2013 rr
th 01
Q tt 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 0.166 204 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 0.6 191 <1.0 <1.0 46.7 0.914 130/1219/2001145 4ltsth Qattrro) :11 ..00
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
4th Qtr 10/29/2015 <1.0 770 <1.0 52 2.2
1st Qtr 3/17/2016 <1.0
<2..00 <1.0 54.2 2.48
2nd Qtr 6/8/2016 <1.0 595 <1.0 <1.0 58.7 2.14 3r4 Qtr 8/4/2016 <1.0 522 <1.0 <1.0 56.9 2.10 4th Qtr 0/27/2016 <1.0 <1.0 437529 <<11.80 <1.0 <1.0 .1 8507.4 2.16 2.06 1st Qtr 3/21/2017 2nd Qtr 6/21/2017 <1.0 256 <1.0 <1.0 58.8 1.97 3rd Qtr 8/4/2017 <1.0 223 <1.0 <1.0 61.2 1.64
4th Qtr 10/11/2017 <1.0 214 <1.0 <1.0 52.2 1.92
Depticate 1W4-75 <1.0 194 1.12 <1.0 56.2 1.71
43 J <3.0 1.90 Iv zvt 3/21/2018 <<11..90 220 <1.0 <1.0 8 60.81 1.36
Deplicate TW4-75 <1.0 171 <1.0 <1.0 60.8 1.36
2nd OR 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
415 Qtr 12/13/2018 <1.0
91303
.8 2:00 <1.0 53.1 1.35 1.23 1st Qtr 3/19/2019 <1.0 <1.0 54.3
2n4 Otr 6/19/2019 <1,0 98 <1.0 <1.0 56.5 1.1
3r4 Qtr 9/12/2019 <1.0 75.4 <1.0 <1.0 52 0.999
EtrapINate TW4-75 <1.0 75.6 <1.0 <1.0 52.5 1.030
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
2n4 Qtr 6/12/2020 <1.0 53.8 <1.0 <1.0 56.9 1.06
3rd Qtr 9/18/2020 <1.0 39.5 <1.0 <1.0 52.6 0.894
4th Qtr 11/11/2020 <1.0 51.3 <1.0 <1.0 54.7 1.27
Deplicate TW4-70 <1.0 52.9 41.0 <1.0 49.9 1.27 DWMROtt sample <10 50.0 <20 <20 56 0.16 H 151 OR 3/18/2021 <1.0 26.9 <1.0 <1.0 52.8 1.00 2nd Qtr 6/16/2021 01.0 22.3 <1.0 <1.0 51 .5 1.12
(1) VOCs were resarnpled becau e laboratory missed holding tnne
(2) Resampled to verify chloroform concentration that was collected on 1/23/14. a, 2 noth non,. nnLwater
snioinforrn pumping wells 1W4-1 and TW4-11 started in 1114115
NA and tiN/A(for graphs) = not analyzed Shaded indicates concentrations xoeeding GWOS. J = Approxirnated value
H s Sample was analyzed beyond holding times and may not be accureate concentration.
TABLE 1 (12 of 31)
Historic Summary Of Monitoring Well Analytical Results Up To The 2nd Qarter 2021
Chloroform Contamination Investigation
DUSA White Mesa Mill
TW4-9
Sarnpling 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 4- 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 __LP • 1st Qtr 3/9/2006 <1.0 <1S 2.6 <1.0 38 1.5 25d 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 4t 10/10/2007 <1.0 8.7 <1.0 <1.0 40 1 s t
h QC):
r
r
3/28/2008 <1.0 1.3 <1.0 <1.0 35 2.1 2n4 Qtr . 6/25/2008 <1.0 1 <1.0 <1.0 35 2.3 3rd Otr . 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 3r0 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 1.7 1st Qtr 2/23/2010 <1.0 <1.0 <1.0 <1.0 377 4 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 <<11..0 <1.0 <1.0 34 1.8 1st Qtr 2/17/2011 <1.0 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 40h 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 Tit air 01" 1/18/2012 <1.0 <1.0 <1.0 <1.0 28 2.3
Ind Qtr 5/31/2012 <1.0 <1.0 <1.0 <1.0 23 4.0
3rd Qtr 8/30/2012 <1.0 <1.0 <1.0 <1.0 22 3.9 4th Qtr 10/3/2012 <1.0 <1.0 <1.0 <1.0 21 3.8 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 3r4 Qtr 8/14/2014 <1.0 47 <1.0 <1.0 27 2.7

Qtr 10/29/2014

41 tht Qtr 3/12/2015 s <1.0 <1.0 101 53.5 <1.0 <1.0 <1.0 <1.0 25 29.5 4.29 3.28 2nd Qtr 6/11/2015 <1.0 35.1 <1.0 <1.0 35.3 1.83 3M Qtr 9/3/2015 <1.0 48 <1.0 <1.0 39.3 1.44 4th Qtr 10/28/2015 <1.0 68.4 <1S <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 6/8/2015 <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

r 10/26/2016

4
1 tht ctt
Qt
r

3/17/2017 s
<1.0
<1.0
76.0 <1.0
<1.0 <1..0 00 37.4 34.5 2.24 2.18 113
2nd Otr 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 DWIAIRC es!!! samMe <0.98 120 <1.5 1.6 J 2.20
1st Qtr 3/21/2018 <1.0 159 <1.0 <1.0 3.53 38 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 Dephcate TW4-76 <1.0 92.4 <1.0 <1.0 42.7 1,11 4th Qtr 12/13/2018 <1.0 109 <1.0 <1.0 36.3 1.23 1st QS 3/19/2019 <1.0 86.4 <1.0 <1.0 36.9 1.09 2n4 Qtr 6/19/2019 <1.0 68.1 <1.0 <1.0 38.3 0.785 3na Qtr 9/11/2019 <1.0 66.0 <1.0 <1.0 35.2 0.904

r 12/18/2019

41 tht Q Qttt 3/18/2020 s <1.0 <1.0 54.8 48S <1.0 <1.0 <1.0
<1.0
40.1 37.7 0.744
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 <1S <1.0 36.7 0.867 4th Qtr 11/11/2020 <1.0 47.1 <1.0 <1.0 37.2 1.11 DYYMRC spirt sample <10 48.0 <20 <20 38 0.97 DWMRC Duplbate sample <10 46.0 <20 <20 38 0.97 (TW4411)
1st Otr 3/18/2021 <1.0 39.0 <1.0 <1.0 . 40.7 1.06 Deplicate TW4-70 <1.0 38.2 <1.0 <1.0 38.7 1.07 2nd Qtr 6/16/2021 <1.0 102 <10 <1.0 37.4 2.0 (1) VOCs were resampled because laboratory missed holding bme. (2) As cf Mao - a and south wild life ponds no longer recenana. ter -N7g,d1FDAN'r graphs/ = not analyzed Shaded hdicates concentrations exceeding GWOS. J = Approdmate value
TABLE 1 (13 of 31)
Historic Summary Of Monitoring Well Analytical Results Up To The 2nd garter 2021 Chloroform Contamination Investigation
DUSA White Mesa Mill
TWal 0
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 -1. Nitrite (10 mg/L) 1st gtr 3/16/2005 NA 140 NA NA NA 1.6 2n4 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 3.3 151 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 7.3 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 Oft 10/10/2007 <1.0 470 <1.0 <1.0 59 6,.7.. 15t Qtr 3/28/2008 <1.0 620 <1.0 <1.0 55 .7.3 2nd Qtr 6/24/2008 <1.0 720 <1.0 <1.0 58 9.9 3rd Qtr 9/10/2008 <1.0 660 <1.0 <1.0 51 9.23 4th Qtr 10/15/2008 NA #N/A NA NA 61 10.5
11/18/2008 <2.0 1,200 <2.0 <2.0 NA #N/A
1st Qtr 3/11/2009 <1.0 1,100 <1.0 <1.0 64 11.6 2n4 Qtr 6/23/2009 <1.0 1,200 <1.0 <1.0 62 9.8 3r8 Qtr 9/14/2009 <1.0 910 <1.0 <1.0 51 8.1
41 t
s
ht QQtt
r
r 12/22/2009
3/3/2010
<1.0
<1.0 3461 '2..00
<1.0
<1.0
51
48
3.8
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
l st Qtr
10/15/2010
2/23/2011
<1.0
<1.0
1 100 <1.0
<1.0
<1.0
<1.0 §.. 32
11.0 , 620 9.0
2nd Qtr 6/14/2011 <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 <1.0 45 1.1 fiftifirfl 1/19/2012 <1.0 76 <1.0 <1.0 40 0.9
2n4 Qtr 6/14/2012 <1.0 79 <1.0 <1.0 48 0.8 3rd Qtr 9/12/2012 <1.0 130 <1.0 <1.0 44 1.0 4th Qtr 140 <1.0 <1.0 45 1.6 1st Qtr 2/101/33//22001123 <1:00 154 <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 41h Otr 11/14./2013 <1.0 1,460 <1.0 <1.0 70.9 16.0 1st 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
41h 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 <1S 89.5 14.0
10/29/2015 <1.0 134_0 <1.0 <1.0 79.9_ 13.5 41 t
s
ht QQ
r
r
3/22/2016 <1.0 1,430 <1.0 <1.0 84.1 17.3 2nd Qtr 6/8/2016 <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 10/26/2016 <1S _1,290 <1.0 <1.0 .4 14.8 41 tsht QQttrr 3/21/2017 <IS 1,260 <1.0 <1.0 944.6 7 13.-0 2nd Qtr 6/21/2017 <1.0 1,140 <1.0 <1.0 73.1 13.0 3ni Qtr 8/4/2017 <1.0 1,320 <1.0 <1S 77 13.4 4th Qtr 10/11/2017 <1.0 1,150 <1.0 <1.0 70 12.9 <9 5 1100 <15 16 J 76 13.0 W DiSIMQ11? s lit P* -3/21/2018 <1,0 1,240 <1.0 <1.0 72.7 11.1 2nd Qtr 6/14/2018 <1.0 914 <1.0 <1.0 64.5 11.2 3rd Qtr 9/6/2018 <1.0 911 <1.0 <1.0 75.5 10.1 4t5 Qtr 12/13/2018 <1.0
<1.0
<<11:00 <1.0
<1.0 63.5 59.3 10.6 9.34 lst Qtr
1,087609
2nd Qtr 6/19/2019 <1.0 799 <1.0 <1.0 58.7 8.86 3rd Qtr 9/12/2019 <1.0 734 <1.0 <1.0 55.8 7.79
41h Qtr 12/18/2019 <1.0 768 <1.0 <1.0 62 6.89
1st Qtr 3/18/2020 <1.0 798 <1.0 <1.0 53.5 7.83
2nd QV 6/11/2020 <1.0 928 <10 <1.0 60.1 8.13
3rd Qtr 9/19/2020 <1.0 854 <1.0 <1.0 53.9 7.34 4th Qtr <2:00 903 <1.0 <1.0 <1.0
<1.0
58.6
58.1 87..6290 1st Qtr 131//1181//22002201 718 2nd Qtr 6/17/2021 <1.0 609 <1S <1.0 48.7 7.75
(11 As of March 201:2 both north ancl south wIld Irfe ponds no Icager recemnr, water
NA and gN/A(for graphs) not analyzed Shaded indicates consentratNns exceeding GWQS. J = Approximate value
TABLE 1 (14 of 31) Historic Summary Of Monitoring Well Analytical Results Up To The 2nd Qarter 2021 Chloroform Contamination Investigation
DUSA White Mesa Mill
T9V4-11phurvorm p.041,1., varte01/14/15)
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)
151 Oh' 3/16/2005 NA 4.400 NA NA NA 8.7 2n4 Qtr 5/25/2005 NA 3.590 NA NA NA 10.3 3rd Qtr 8/31/2005 <10 4,400 010 <10 NA 9.4 4th Qtr 12/7/2005 <100 4,400 </00 0100 • 58 9.4 ..................... 1st Qtr 3/9/2006 <50 4,400 <50 050 56 9.2 2nd Qtr 6/14/2006 <50 4,300 050 <50 56 10.0
314 Qtr 7/20/2006 <50 4,080 050 <50 55 10.0
11/8/2006 4ftsht
ct
O tt
r
r 8„560 2.7 1.3 10.0 _ _ 2/28/2007 1.3 3,600 <1.0 1.6
5545
10.1 2nd Qtr 6/27/2007 1.6 3,800 <1.0 <1.0 53 10.6 3r4 Qtr 8/15/2007 1.7 4,500 <1.0 <1.0 53 10.2 10/10/2007 1.6 4 400 <1.0 1.2 53 9.8 41 t
s
ht 0Q tt
t
r
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 41h Qtr 10/15/2008 NA ithl/A NA NA 47 9.5 11/18/2008 <2.0 1,000 <2.0 <2.0 NA #N/A 1st Qtr 3/11/2009 <1.0 1,090 01.0 01.0 49 7.3 2nd Qtr 6/23/2009 <1.0 980 01.0 <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 2n4 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 41h Qtr 10/15/2010 <1.0 720 <1.0 <1.0 49 151 Qtr 2/23/2011 <1.0 1 ,000 <1.0 <1.0 48 ..... :6.4 ..1 2nd Qtr 6/1/2011 <1.0 930 <1.0 <1.0 49 73 314 Qtr 8/17/2011 <1.0 820 <1.0 <1.0 48 7.1 41h Qtr 1/16/2011 <1.0 1500 <1.0 <1.0 46 7.1 Time-0T /24/2012 <1.0 610 <1.0 <1.0 43 6.8
Ind Qtr 6/13/2012 01.0 660 <1.0 <1.0 52 6.7 3rd Qtr 9/13/2012 <1.0 740
730
<1.0 <1.0 49 3.0 4th Qtr 10/3/2012 1st Qtr 2/13/2013
<1.0
3.23
<1.0
<1.0
<1.0
<1.0 50 47.3 6 ---7-2 867
2n4 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 <1.0 874 <1.0 <1.0 46.7 8.01 40h Qtr 11/13/2001134 1st Qtr 21 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 3r4 Otr 8/27/2014 01.0 719 1.2 <1.0 48 5.4 Qtr 10/29/2014 ,31h <1.0 803 <1.0 56.4 7.33 1st OM) 3/9/2015 1.24 2,450 <1.0 ' <11,00 49.8 8.72
2nd Qtr 6/11/2015 <1.0 2,710 <1.0 <1.0 62.2 8.48 3r4 Qtr 8/31/2015 <1.0 1,120 <1.0 <1.0 73.1 9.61 4th Qtr 10/29/2015 1st Qtr 3/9/2016 <1 0 1.2 .1130 2,660 <1.0 <1.0 <1 0 <1.0 5 55
5,
35 7 5
7.13 2n4 Qtr 5/23/2016 2.19 3,340 <1.0 <1.0 56.4 7.81 3r4 Qtr 7/25/2016 <1.0 3,200 <1.0 <1.0 55.3 8.83 4th 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 41h Qtr 10/11/2017 1.48 2,880 <1.0 <1.0 49.7 7.79 DWMRC splitlismple <38 2 900 <60 140 J 52 8.0 1st Gilt 3/12/2018 1.82 3,090 <1.0 <1.0 54 7.89 2nd Qtr 6/8/2018 1.34 2,800 <1.0 <1.0 52.4 7.51 314 Qtr 8/22/2018 1.47 3,050 <1.0 <1.0 53.3 7.15 4 t
s
h 0 r 11/ t Q tt 1

t 32/88//2200118 9 1.33 _930 1 <1.0 <1.0 45.4 6.85 1.48 2.820 <1.0 <1.0 46.8 7.50 2n4 Qtr 6/5/2019 1.52 2,970 1.4 <1.0 45.3 8.30 3rcl Qtr 9/4/2019 1.47 2,790 <1.0 <1.0 48.8 7.15 41h Qtr 12/18/2019 <1.0 3,250 <1.0 <1.0 49.0 7.14 1s1 Qtr 2/19/2020 <1.0 2,990 <1.0 <1.0 51.9 7.07 2n4 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 01.0 46.3 7.59 10/28/2020 <1.0 2,670 3.86 01.0 43.3 7.19 41 t
s
ht aQtt
r
r
2/23/2021 <1.0 2,750 <1 0 <1.0 49.5 7.21 2n4 Qtr 6/9/2021 <1.0 3,320 <1 0 <1.0 37.7 8.17 (1) As of Mar. 2012 bot north and south Anld ponds no longer re,c4,,Ing
121.Chlorotontn Eumpnevell started 1 MC5
NA = not analyzed Sold and itafics indicates the MDL exceeded the GWQS. Bold and italics indicates the MDL exceeded the GWQS. J Approximated value
TABLE 1 (15 of 31)
Historic Summary Of Monitoring Well Analytical Results Up To The 20d 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
(90 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 2n5 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 Otr 12/7/2005 <1.0 <1.0 1.0 <1.0 1 9 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 3r5 Qtr 7/20/2006 <1.0 <1.0 1.4 <1.0 16 1.4
4th Qtr <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
410 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 _ ._. .._ 1st QV 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
3rcl Qtr 9/14/2009 <1.0 <1.0 <1.0 <1.0 22 5.1
<1.0 <1.0 <1.0 <1.0 23 3.6 41 ts 12/16/2009 th Q0 rr 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
41 tsht QQ tt rr 10v/1155/12200110
1 <1.00 <1.0 <1.0 <<11..00 <1.0 <1.0 Ai 8.0 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 firafi (1) 1/17/2012 <1.0 <1.0 <1.0 <1.0 28 7.7
Nd Cltr 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 Qtr 10/3/2012 <1 0 <1.0 <1.0 <1.0 39 13.0
1st Qtr 2/13/2013 <1.0 <1.0 <1.0 <10 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
11/6/2013 <1.0 <1.0 <1.0 <1.0 ._....4.1,1 ip,..1. 41 tsht Qattrr 1/22/2014 <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 130//2131 //22001145 1st Qtr
<<11 :00 <1.0
<1.0
<1.0 <1.0 <1.0
<1.0
50.2 50.6 16.1 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
paiieate TW4-66 <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
<sok. TNWE 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 10/12/2018 <1.0 <1.0 <1.0 <1.0 72.6 26.8 41 tsht QQ it rr 3/14/2017 <1.0 <1.0 <1.0 <1.0 62.6 25.9 2nd Qtr <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 4t5 Qtr 10/10/2017 <1.0 <1.0 <1.0 <1.0 56.2 26.9 %Az:" TW4-70 3/14/2018 <1.0 <1.0 <1.0 <1.0 <1.0 <1.0 <1.0 <1.0 61.4 59.5 26.8 19.8
2nd Qtr 6/12/2018 <1.0 <1.0 <1.0 <1.0 53.6 18.4
3r11 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 3/18/2019 <1.0 <1.0 <1.0 <1.0 50.8 10.1
2nd Qtr 8/13/2019 <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
41111 of:I tt rr 12/14/2019 3/17/2020 <1.0 <1.0
<1.0
<1.0
<1.0 <1.0 <1.0 <1.0 , 58.0 53.0 8.04 6.39
2nd Qtr 8/11/2020 <1.0 <1.0 <1.0 <1.0 51.7 4.95
3rd Qtr 9/17/2020
_
<1.0 <1.0 <1.0 <1.o <1.0 50.3 2.34 <1.0 <1.0 <1.0 <1.0 <1.0 <1.0 52.0 --.1"% ittf. 11/4/2020 m 3/17/2021 <1.0 2nd Otr 6/15/2021 <1.0 <1.0 <1.0 <1.0 51.8 2.39
NA = not analyzed Shaded ndicates concentrasons exceedng GWOS
TABLE 1 (16 of 31) Historic Summary Of Monitoring Well Analytical Results Up To The 2nd Qarter 2021
Chloroform Contamination Investigation
DUSA White Mesa Mill
1W4-13
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)
151 Otr 3/16/2005 NA <1 0 NA NA NA 4 2 2r4 Qtr 5/25/2005 NA <1 0 NA NA NA 4 3
3rd Qtr 8/31/2005 <1 0 <1 0 3 1 <1 0 NA 4 6
4th Qtr <<11 g _ _ <1 0_
<1 0
0 .<1 <2 00 69
67
4 3
4 2 1st Qtr 13/9//22808068 1 7
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 Car 11/8/2006 <1 0 — <1 0 1 st Qtr 2/28/2007 -<1 0
<<11 00 <<11 08 <1 0
3639
80 48
2nd Qtr 6/27/2007 <1 0 <1 0 <1 0 <1 0 59 4 6
351 Qtr _... .....,,_ 1 ,,,i0;
8/15/2007 10,j0,2007 <1 0 1 0 :1 0 <1 0 <1 0 <,,, 9 e 0 <1 0 <1 o 58
58
4 4
4 1 3/28/2008 <2 0 0 <1 0 54 3 8 2nd Qtr 6/25/2008 <1 0 <1 0 <1 0 <1 0 58 4 2 3rd Qtr 9/10/2008 <1 0 <1 0 <1 0 <1 0 50 4 3 415 Qtr 10/15/2008 <1 0 <1 0 <1 0 <1 0 58 -.. .. lsi Qtr 3/4/2009 <1 0 <1 0 <1 0 <1 0 58 — - ---1.8i 2nd Qtr 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
1st Qtr
12/19 /29_09
2/24/2010
<1 _ 0
<1 0
<<1 0
1 0
<<1 0
1 0
' <I ' 60 ., _ 4 1
4 3 53
2nd Qtr 6/14/2010 <1 0 <1 0 <1 0 <1 0 53 5 2
3r4 Qtr 8/10/2010 <1 0 <1 0 <1 0 <1 0 55 5 6 lthQtr
1s1 Qtr
10/15/2010 <1 0 <1 0
<1 0
<2 00 <1 0
<1 0 55 5 8
5 5 2/15/2011 <1 0 60
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 Otr 11/15/2011 «i 0 <1 0 <1 0 <1 0 54 5 9 firOtRif 1/17/2012 t<10 <1 0 <1-0-- <1 0 - 55 5 5
2nd Qtr 5/31/2012 <1 0 <1 0 <1 0 <1 0 50. 6 0 3rd Qtr 8/29/2012 <1 0 <1 0 <1 0 <1 0 60 6 2 41h Qtr <1 0 <1 0 <1 0 60 5 9 1st Qtr 101/33//22001123, 2/ <11 0 < 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 Car 11/6/2013 <1 0 <1 0 <1 0 58 5 6 48
1st Qtr 1/22/2014 <1 0
<11 0 < 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
41h Qtr 10/23/2014. <1.0 _ <1..9 _ _ <1 0 <1 0 66 1 6 28
1s1 Qtr 3/11/2015 ..1 0 <1 0 <1 0 <1 0 68 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 4th 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 <1 0 <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
r 4il
t QQttr

1
10/10/2017
3/14/2018
<1 0
<1 0
<1 0
<1 0
<1 0 <1 0 60 9
71 0
6 17
5 76 <1 0 <1 0
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 _ <1 0 <1 0 <1 0 5 29
1st Qtr 13
1//3
160//22001.98 <2 00
<1 0 <1 0 <1 0
6641 56
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 12/14/2019 <1 0 <1 0 <1 0 <1 0 6 7 5 17 41 ilt QQttrr 3/17/2020 <1 0 <1 0 <1 0 <1 0 68 3 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
r" " ' " fsihttr 47//2280281 - :11•(2 1/ <1 0 <1 0 <1 0 60 6 67 3 4 92 <11 < 83 <1 0 <1 0 <1 0 5 57 2nd Qtr 6/15/2021 <1 0 <1 0 <1 0 <1 0 57 7 2 9
NA not analyzed Shaded indicates concentrations exceeding GWOS
TABLE 1 (17 of 31)
Historic Summary Of Monitonng Well Analytical Results Up To The 2nd Clatter 2021
Chloroform Contamination Investigation
DUSA White Mesa Mill
TW4-14
Sampling Event Parameter (GWC3S) Carbon Tetrachloride
(5 pg/L)
Chloroform
(70 pg/L)
Chloromethane
(30 pg/L)
Methylene Chloride
(5 pg/L)
Chloride
No GWOS (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
28d Qtr 6/14/2008 NS NS NS NS NS NS 3r0 Qtr 7/20/2008 NS NS NS NS NS NS
4th Car 11/8/2006 <1 0 — 37, 4 _2
1st Qtr 2/28/2007 <1 0 r-1S- 1 0 " - a" <<1"96-- 1 '-i-1•1 ()-" ) " - 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
15t 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 r st h_QQtt /4 r, _ 10/315//22000089 0 <1 0 <1 0 <1 0 <1 0 <1 0 <-1 0 40 35 _ 0 76 1 5- <21 0 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 0 <1 0 33 2 5 2nd Qtr 6/14/2010 <1 0 <1 0 <1 0 <1 0 49 2 9 3rd Qtr 8/10/2010 <1 0 <1 0 <1 0 <1 0 35 2 8 4th Qtr 10/15/2010 1st Qtr 2/15/2011 <1 0 <1 0 ,<1 0 <1 0 :1190 " " _ 229 5 - - : 1 <1 0 <1 0 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 "lst Lit (1) 1/17/2012 <1 0 <1 0 <1 0 <1 0 20 1 9
Ind Qtr 6/14/2012 <1 0 <1 0 <1 0 <1 0 35 3 3
3m1 Qtr 8/29/2012 <1 0 <1 0 <1 0 <1 0 37 3 9 4th Qtr 10/3/2012 <1 0 <1 0 <1 0 <1 0 37 _ _ 3 9 1st Qtr 2/7/2013 <1 0 <1 0 <1 0 <1 0 35 2 4 6 2nd Qtr 5/29/2013 <1 0 <1 0 <1 0 <1 0 38 6 4 4 3rd Qtr 8/29/2013 <1 0 <1 0 <1 0 <1 0 37 6 4 51 4th Qtr 11/6/2013 <1 0 <1 0 <1 0 <1 0 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 1st Qtr 103//213v/22001145 0 <21 0 <1 0 1 7 <1 0 <1 0 <1 0 <1 0 _ 38 9 40 1 _ _ 5 22 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
41h Qtr 10/23/2015 <1_0 _ ...... _.:1_46..5.1_0 <1 0 40 6 2 45
1st Qtr 3/16/2016 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
7 02 <1 0 45 6 2 86 4t5 Qtr 103//2101/22_064 1st Qtr 00 _2_< 6 45 <1 0 9 1 51 28 45 4 4 36
2nd Qtr 6/15/2017 <1 0 6 85 <1 0 <1 0 46 9 5 12
3rd Qtr 8/2/2017 <1 0 6 14 <1 0 <1 0 46 4 4 84
4th Qtr 10/10/2017 <1 0 6 13 <1 0 <1 0 4 4 73
1st Qtr 3/15/2018 <1 0 5 8 <1 0 2 18
525
1 5 5 67
2nd Qtr 6/13/2018 <1 0 5 12 <1 0 <1 0 46 9 6 36
3r4 Qtr 8/30/2018 <1 0 4 78 <1 0 <1 0 54 1 5 34
4t h r 12/12/2018 <1 0 4 41 <1 0 <1 0 48 7 5 85
1 s
tQ
r

3/16/2019 Q tt <1 0 4 08 <1 0 <1 0 48 7 6 16
2nd Qtr 6/13/2019 <1 0 4 18 <1 0 <1 0 48 3 5 86
3rd Qtr 9/11/2019 <1 0 6 08 <1 0 <1 0 45 4 4 77 3 83 2 98 <1 0 <1 0 <1 0 <1 0 49 4 48 4 4 76 6 17 4 th r 1221 1st QQttr 3 0247/1220190 < 11 0 e 0
2nd Qtr 6/11/2020 <1 0 2 87 <1 0 <1 0 47 6 6 57 3rd Qtr <1 0 2 41 <1 0 <1 0 45 1 5 57
_ _ _ ... 21 6779, <2 00 <1 0 <1 0 49 7 48 2 5 81 5 56 ilititti ti,,;litr,r_ _ _ 11/1,48//22002201 <21 00
2nd Qtr 6/16/2021 <1 0 <1 0 <1 0 <1 0 49 5 7 02
NS = not sampled
Shaded indicates oonoentratons exceeding GWCIS
TABLE 1 (18 of 31) Historic Summary Of Monitoring Well Analytical Results Up To The 2nd Qarter 2021
Chloroform Contamination investigation
DUSA White Mesa Mill
TM/4-16
Sampling Event
Parameter
(GWQS) Carbon Tetrachloride
(6 pg/L)
Chloroform
(70 pg/L)
Chloromethane
(30 pg/L)
Methylene Chloride
(5 pg/L)
Chloride
No GWQS ) maN Nitrate, Nitrate + Nitrite
(10 mg/L)
1st Qtr 3/16/2005 NA 240 NA NA NA 00.1
2nd Qtr 5/25/2005 NA 212 NA NA NA <41
3r4 Qtr 8/31/2005 <1.0 85 3.2 43 NA <0.1
4111 QQ:
r
r 12/7/2005
3/9/2006
<1.0 2.6
1.1
5.9 64 60 1.4
3 <1.0 3
149
21
2nd Qtr 6/14/2006 01.0 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 01.0 9.2 62 5.6
1st Qtr 2/28/2007 01.0 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 Otr 9/10/2008 <1.0 10 <1.0 14 71 10.5
4t Q 10/15/2008 <1 0 3.9 <1.0 <1.0
<1.0
8.6 8793 9.8 96 t
h Q tt rr 1 s 3/4/2009 <1.0 <1.0 2nd Qtr 6/23/2009 <1.0 <1.0 <1.0 <1.0 76 8.9 3r11 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 5.2 1st atr 3/24/2010 <1.0 <1.0 <1.0 <1.0 776 7 4.2 2rid 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
41:6°1- - ifiltig _ 'Til-"' 3 <1.0 <1.0 7861 3.3 15 <1.0 <1.0 7 2nd Qtr 5/26/2011 <1.0 16 <1.0 <1.0 81 5 3rc1 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) 12/7/2011,519__,.. <1.0 <1.0 1.4 NA Tit Qtr (3) 1/18/2412 <14 • <1.0 <1.0 1.7 48 0.7
Ind 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
10/3/2012 01.0 <1.0 <1.0 <1.0 59 00.1 4
111 c,
Qt
r
r
2/7/2013 <1.0 <1.0 <1.0 <1.0 58.1 <0.1
2nd Qtr 5/30/2013 <1.0 <1.0 01.0 4.21 49.8 00.1
3rd Qtr 9/5/2013 <1.0 <1.0 <1.0 <1.0 54.4 <0.1 11/7/2013 <1.0 13.4 <1.0 <1.0 56.6 1.37 41 tsht Qattr
r 1/29/2014 <1.0 6.93 <1.0 <1.0 66.8 3.18 2nd Qtr 5/22/2014 <1.0 14.6 01.0 <1.0 80.7 4.94 3rd Qtr (2) 8/14/2014 <1.0 229 <1.0 01.0 80 5.1 3rd Qtr 9/24/2014 <1.0 371 387 <1.0 <1.0 NA NA 4li 10/29/2014 Qtr 3/12/2015 <1.0 <1.0 <1.0 <1.0 <1.0 <1.0 1 926.5 8.4 4.3 153 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 QV 10/28/2015 <1.0 112 <1.0 <1.0 58.3 1.69
15t Qtr 3/17/2016 <1.0 45.9 <1.0 <1.0 56.5 1.63
20d Qtr 5/26/2016 <1.0 93.4 <1.0 <1.0 61.3 1.89
3r11 Qtr 8/3/2016 <1.0 49 <1.0 <1.0 60 2.20
41h Qtr 10/26/2016 <1.0 92.9 <1.0 <1.0 66.7 2.78
1s1 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 01.0 143 <1.0 <1.0 67.1 2.63
4t5 Gri 10/11/2017 <1.0 98 <1.0 <1.0 54.2 2.12
OWAIRc_apitt sample, <0.95 92 ..,....., <1.5 1.9 J 64 2.00
1st Orr 3/20/2018 <1.0 170 <1.0 <1.0 85.1 4.55
Duplicate TW4-75 01.0 171 <1.0 <1.0 84.7 4.51 2nd Qtr 8/14/2018 <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 3.38 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 01.0 94.3 <1.0 <1.0 88.6 3.37
Dugliette 1tN4-75 <14 <1.0 84.1 3.12 151 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 4t5 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
DVVMIRC spot sample <10 290 <20 <20 87.0 0.37 M
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
(1) VOCs were res.:Implied because laboratory missed holding hide
(2) VOCs were resempled it) As Marc, 2012 both nortt and south wild life ponds no longer receiving water.
NA tt. not analyzed
Shaded indicates concentrations exceeding GWOS.
J = Approtemate value
H = Sample was analyzed beyond holding times and may not be accureate concentrated.
TABLE 1 (19 of 31) Historic Summary Of Monitoring Well Analytical Results Up To The 2nd Qarter 2021
Chloroform Contaminahon Investigation DUSA White Mesa Mill
TW4-18 Sampling Event Parameter (GWOS)
Carbon Tetrachloride
(S PO-)
Chloroform
(70 pg/L)
Chloromethane
(30 PRA-)
Methylene Chloride
(5 119/1-)
Chloride
No GWQS (rrig/L)
Nitrate, Nitrate . Nitrite
(10 mg/L) 1st OR 3/16/2005 NA CO C
O

cr. olc
o

co

co

.n
i
c
l
to cr. 'Iv
. r-, co .t..-

ac
t

co

cIlls f...1 17
.4 go
l
. g ji .

•-1.-

'
-

ci (s
i
lo
,

to

hr
s.
.
° ex

co
,
•
: , I 1 ,
i
NA NA NA 14.1 2nd Otr 5/25/2005 NA NA NA NA 12.9 3rd Otr 8/31/2005 <1.0 2.8 <1.0 NA 13.3 1.1 <1.0 41 7.3 12/3/70//22000065 4itsht OCritrr <<11..00 1.6 <1.0 38 5.9 2nd Otr 6/14/2006 <1.0 2.7 <1.0 35 4.7 3rd Qtr 7/20/2006 <1.0 <1.0 <1.0 35 6.1 4.1 tsht OCIttir 7 /117/ 88 // 22000067 :11 . . 00 <1.0 <1.0 <1.0 30 34 5.7 5.1 <1.0 2nd Otr 6/27/2007 <1.0 <1.0 0 28 4.9 3r5 Qtr 8/15/2007 <1.0 <1.0 <1.0 <
<11
.
.0 32 5.0
111 (3Qttrr 3/28/2008 <1.0 <1.0 <1.0 <1.0 4 10/10/2007 <1.0 7 -
4.4
28 -11 2n4 Otr 6/25/2008 <1.0 <1.0 <1.0 23 4.6
3rd Cttr 9/10/2008 <1.0 <1.0 <1.0 26 4.9
10/15/2008 <1.0 <1.0 <1.0 <1.0 <1 0 30
29
5.2
5.2 4183i ttrr 3/4/2009 <1.0
2nd Qtr 6/23/2009 <1.0 <1.0 <1.0 30 6.2
3rd Otr 9/14/2009 <1.0 <1.0 <1.0 26 5.9 4t5 Qtr 12/17/2009 <1.0 <1.0 <1.0 30 5.4
1st Qtr 3/24/2010 <1.0 <1.0 <1.0 41 5.1
2nd Otr 6/14/2010 <1.0 <1.0 <1.0 35 9.0
3rd OR 8/12/2010 <1.0 <1.0 <1.0 37 9.0
<1.0 <1.0 <1.0 10.0 4 tspittr tr 10/15/2010 1 2/22/2011 <1.0 39 <1.0 <1.0 552° 10.0
2nd Qtr 5/28/2011 <1.0 26 <1.0 <1.0 36 9.0
3rd Otr 8/17/2011 <1.0 29 <1.0 <1.0 23 4.6
41h Qtr 11/16/2011 NA 1rLA NA NA 23 6.3
( 12/7/2011 <1.0 28 <1.0 <1.0 NA NA 1/18/2012 <1.0 25 <1.0 <1.0 18 4.4
Ind Qtr 6/13/2012 <1.0 24 <1.0 <1.0 30 6.6 3rd Otr 9/11/2012 <1.0 38 <1.0 <1.0 26 6.6
4th Otr 10/3/2012 <1.0 30 <1.0 <1.0 27 6.0
Mt Citr 2/13/2013 <1.0 34.9 <1.0 <1.0 23.1 5.6
2nd otr 6/13/2013 <1.0 37.9 <1.0 <1.0 22.9 8.9
3rd Qtr 9/5/2013 <1 0 41 <1.0 <1.0 38.2 12.1
41h Otr 11/13/2013 <1.0 44,3 <1.0 <1.0 37.1 14.2
1st Qtr 1/30/2014 <1.0 6.93 <1.0 <1.0 38.9 12.8
2nd Qtr 5/22/2014 <1.0 6.93 <1.0 <1.0 47 12.2
3rd Qtr 8/14/2014 <1.0 32.8 <1.0 <1.0 49 9.8 <1.0 33 <1.0 <1.0 40.8 11.1 tor 10/28/2014 41 tsht oC1 3/12/2015 <1.0 32 <1.0 <1.0 41.6 11.7 2nd Otr 6/11/2015 <1.0 30.5 <1.0 <1.0 43.5 9.69 3rd Qtr 9/3/2015 <1.0 28.7 <1.0 <1.0 47.6 15.7 4th Otr 103//21%001156 1st Qtr <<11: 52.9 56.6 <18 <1.0 <1 0 <1.0 39.4 40.7 6.24 5.96 2nd Otr 6/8/2016 3rd Qtr 8/3/2016 <1.0 <1.0 60 56.3 <1.0 <1.0 <1.0 <1.0 4443°3...78
5.45 5.79 10/26/2016 <1.0 60.1 <1.0 § .24 <1.0 9 41 tsht aCittrr 3/16/2017 <1.0 62 <1.0 <1.0 39.4 4.47
Duplicate TW4-75 <1.0 61.5 <1.0 <1.0 41.1 4.41
2nd Qtr 8/20/2017 <1.0 63.8 <1.0 <1.0 41.6 4.50
3rd Qtr 8/3/2017 <1.0 62.8 <1.0 <1.0 40.4 4.24
Duplicate TW4-75 <1.0 62.3 <1.0 <1.0 41.5 4.31
41h Qtr 10/11/2017 <1.0 62.9 <1.0 <1.0 37.1 4.43
1st Qtr 3/15/2018 <1.0 62.3 <1.0 <1.0 44.3 4.32
28d Otr 6/13/2018 <1.0 59.9 <1.0 <1.0 39.5 4.09
3rd Qtr 8/30/2018 <1.0 56.2 <1.0 <1.0 45.6 3.51
12/13/2018 <1.0 57.6 <1.0 <1.0 38.2 3.60 41 tsht QO tt rr 3/19/2019 <1.0 52.8 <1.0 <1.0 37.6 3.85
25d Qtr 8/19/2019 <1.0 54.2 <1.0 <1.0 39.5 4.01
Duplicate TW4-75 <1.0 54.4 <1.0 <1.0 40.8 2.95
3rd Qtr 9/11/2019 <1.0 58.2 <1.0 <1.0 38.8 3.25
4th Qtr 12/18/2019 <1.0 62.0 <1.0 <1.0 42.7 33.021 1st otr 3/18/2020 <1.0 57.0 <1.0 <1.0 39.4 .7
2nd Qtr 6/12/2020 <1.0 58.2 <1.0 <1.0 41.4 3.62
3rd Qtr 9/18/2020 <1.0 60.0 <1,0 <1.0 38.7 3.36
4th Qtr 11/11/2020 <1.0 58.6 <1.0 <1.0 39.6 3.67 DA/PARC syXt sample 1st Car 3/1812021 <10 <1.0 56.0 52.0 <20 <1.0 <20 <1.0 41.0 41.8 "." 1:0 2nd otr 6/19/2021 <1.0 58.2<1.0 <1.0 41.4 3.62
(1) VOCs were resembled because laboratory missed holding erne_ 121 As of March 2012 both north an< south wild hfe ponds no longer receiving water.
NA not analyzed Shaded indicates concentrations exceeding GINOS.
TABLE 1 (20 of 31)
Historic Summary Of Monitoring Well Analytical Results Up To The 2nd Qarter 2021
Chloroform Contamination Investigation DUSA White Mesa Mill
TW4-19 (chlorofrom pumping well started 4/30/03)
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 f• Nitrite
(10 mg/L)
1st Otr 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 060 2,800 <50 <50 81 <0.1
lst Qtr 3/9/2006 <50 1,200 050 <50 as 2nd Qtr 6/14/2006 <50 1,100 <50 <50 116 5.2 3rd Qtr 7/20/2008 050 1,120 <50 050 123 4.3 11/8/2006 1,050 2.6 <1.0 4.6 2 tt r 41 tsht
o
i r 2/28/2007 1,200 <1.0 <1.0 1343
13 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 10/10/2007 JApo <1.0 <1.0 41 th Qtr st 43tr 3/28/2008 2 9 1.800 <1.0 <1.0 2nd Otr 6/25/2008 <1.0 1,000 <1.0 <1.0 128 2.8 316 Qtr 9/10/2W8 8.6 3,600 <1.0 <1.0 113 35.2 4th Otr 1st Otr 10/31/54//22W0089 12 4 200 1,100 <1.0 <1.0 <1.0 47.8 1.2 <1.0 11247 2 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 OP 16 4,700 <1.0 <1.0 124 28.7 1st OR 12/2/2W/22000190 17 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 Chr 8/16/2010 4.9 2,000 <1.0 <1.0 142 5.9
1.1i.t 1W15/2010 2/17/2011 1.3 17 1 200 <1.0 <1.0 <1.0 <1.0 148 135 2.7 17.0 3.400 2nd Qtr 6/7/2011 8.3 4,000 <1.0 <1.0 148 12.0 3r4 Qtr 8/17/2011 2.1 970 <1.0 <1.0 148 3.0 4th Otr 11/16/2011 148 5.0 (1) 12/6/2011 5.4 2,200 ,...,,,..._ <1.0 <1.0 fifaft01-- -7/29-ki0i12 fr 690 <1,0 <1.0 138 --6,6 -2nd Qtr 616/2012 - 1.1 460 <1.0 <1.0 149 2.4 3rd OR 9/4/2012 3.5 950 <1.0 <1.0 149 2.5 41t,th clottrr 10/3/2012 2/13/2013 4 5.15 1500 <1.0 <1.0 <1.0 <1.0 - '--.1I - _ 4.1 8.0 4.210 2nd Qtr 6/5/2013 5.15 2,070 <1.0 <1.0 148 3.0 3rd Qtr 9/3/2013 20.7 8.42 8,100 942 <1.0 <1.0 179 17.6
hQ1t r Tst Qr °013 112/2 14 1/2 <1.0 <1.0 <1.0 <1.0 134 134 4.7 1.8 4.05 586 2nd Qtr 5/19/2014 5.51 810 01.0 <1.0 152 1.3 3rd Otr 8/11/2014 1.9 1,410 8.3 <1.0 140 1.6 4th Qtr 10/21/2014 4.8 4 aiii <1.0 0 <e11 ..0 130 4.7 1st OR 3/9/2015 8.92 4.660 <1.0 238 8.56 2nd Qtr 8/8/2015 2.62 1,570 <1.0 <1.0 180 0.916 316 Qtr 8/31/2015 <1.0 7,860 7.78 <1.0 326 11.6
aQtt rr 10/ 12.2 7,840 5.46 <1.0 252 10.6 41 t
s
ht 31/99//2200115
6 13.5 7,780 1.4 <1.0 276 15.70
2nd Ott 5/26/2016 23.1 12,600 <1.0 <1.0 204 1.27
3rd Qtr 7/25/2016 9.89 61340 <1.0 <1.0 214 10.5
4th OR H_ 10.8
3.06
6,640
1,240
<1.0
<1.0
<1.0 2060
1 4 _ 10.0.
11.1 1st OR
10/31,331,22001167
<1.0
2nd Otr 6/13/2017 1.35 510 <1.0 <1.0 135 0.243
3r4 Qtr 7/26/2017 13.0 8,840 <1.0 <1.0 218 1.120
10/11/2017 <1.0 129 <1.0 <1.0 0.377 41 t
s
hi Q/
Q:r
3/12/2018 1.36 2 ,640 <1.0 <1.0 1139 93 8.6 2nd Qtr 6/8/2018 3.45 2.980 <1.0 <1.0 138 0.494 3r4 Qtr 8/30/2018 2.03 1,910 <1.0 <1.0 166 2.55 6.18 5 270 <1.0 <1.0 0.233 41 tstti at; o 11/321/2 2001189 1 2.43 2,050 <1.0 <1.0 11490 7 6.58 2nd Qtr 6/5/2019 15.9 11,500 <1.0 <1.0 160 8.96 3rd Q1r- 9/4/2019 10.1 6,670 <1.0 <1.0 153 0.33 4th Qtr 1st Qtr 12/ 2111091/2200219 0 <1.0 13.7 551 8.720 <1.0 5.41 <1.0 <1.0 147 205 0.535 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
!t. tl1t rr
10/28/2020
2/23/2021- _.1.1 660 <1.0
5.41
<1.0
<1.0
104
167
1.1
8.6 8.4 6,660 2nd Qtr 6/9/2021 <1.0 775 <1.0 <1.0 115 4.04
(1) VOCs were resarnpled because laboratory missed holding time ,2) A, of March 2012 both north and south wild llfe ponds no longer receiving water.
NA = not analyzed Bold and italics indicates the MOL exceeded the GWOS. Shaded indWates concentrations exceeding GWQS.
TABLE 1 (21 of 91)
Historic Summary Of Monitoring Well Analytical Results Up To The 2n4 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) 1st Qtr 3/16/2005 Mondor 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 <10 010 NA 2.90 4th Qtr 12/7/2005 <250 19,290 <250 <250 131 1.80 151 Qtr 3/9/2006 <500 9,2.00 <500 <500 120 3.80 2nd Qtr 6/14/2006 0500 61,000 <500 <500 235 9.40 3rd Qtr 7/20/2006 <1000 5,300 <1000 <1000 134 2.90 41 t
s
ht
Qattr
r 11/8/2006 7.1 11,000 1.9 2.2 124 3.50 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 4111 Qtr 10/10/2007 6.8 9,000 <1.0 1.9 170 5.60 101 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 41 t
s
ht oQtt
t
r 10/31/54/122000089
NA
NA NA 168 5.51 5.7 8,200 <1.0 5.2 164 5.10 2n4 Qtr 6/23/2009 4.9 6,800 <1.0 4.2 164 2.90 3rd Otr 9/14/2009 8.4 13,000 <1.0 4.4 153 3.30 41h Qtr 12/22/2009 14 15,000 <1.0 3.0 5.30 lst Qtr 2/17/2010 2.7 3,500 <1.0 3.2 11,g
2.00 2nd Qtr 6/14/2010 11 18,000 <1.0 3.7 200 5.60 3nd Qtr 8/16/2010 12 15,000 <1.0 2.2 196 5.30 4
1
t
sht Qt
0t
r
r 102//1157//2200110
1 20 27
?Igo
31,000 <1.0 <1.0 5.5 203 220 4.60
4.40 19.0 20d Qtr 6/7/2011 10 8,100 <1.0 2.1 177 4.80 3rd Qtr 8/17/2011 7.3 3,800 <1.0 3.1 207 6.50 418 Qtr 11/16/2011 7.2 7,810 <1.0 2.5 186 4.20 isillti3l 1/23/2012 10 11,000 <1.0 1.3 • 207 7.90 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 18,500 <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 th Otr 17.3 18100 <1.0 272 9.64 st Qtr
101/297//22001134
/2 18.4 '17,800 <1.0 21..37 04 254 7.58 nd Qtr 5/19/2014 22.1 22,100 2.31 3.98 269 5.95 3r11 Qtr 8/11/2014 14.1 12,400 55.2 2.2 299 4.30
ilt QC) t1 rr 10/21/2014
3/9/2015
18.5
20.8
2q,p-.1
19,900
4.04
4.85 2.38 1.38 292 290 7.87 9.80 nd 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 9.3 418 Qtr 10/19/2015 14.5 .17,900 10 8 1 293 6.23 1st Qtr 3/9/2016 20.2 21.600 4.09 1.16 293 10.30 2nd Otr 5/23/2016 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 41: oQttin 10/31/28//22001167 24.4 21,300 <1.0 <1.0 301 11.4 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 4t8 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 3rd Qtr 8/22/2018 9.85 10,500 4.98 <1.0 282 8.14 4th Qtr 11/32038/
122001189 8.32 15.8 <1.0 295 9.72 1st Qtr 15.4 185:868008 <1.0 <1.0 272 6.7 2nd Qtr 6/5/2019 10.1 13,700 <1.0 <1.0 279 9.59 31 Qtr 9/4/2019 8.39 10,500 <1.0 <1.0 286 10.20 41h Qtr 12/10/2019 5.92 8 790 9.75 1st Qtr 2/19/2020 8.6 14,300 210'8.27 <<11,80 338170 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 resembled because laboratory rnwsed holding brne. (2) As of March 2012 both north and south wad life ponds no longer receiving water.
(31Chtoroforrnzimpinvell start!d 6/4/05. NA = not analyzed Bold and italics indicates the MDL exceeded the GWQS. Shaded indicates concentratNns exceeding GWQS.
TABLE 1 (22 of 31)
Historic Summary Of Monitoring Well Analytical Results Up To The 20d 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) 1s1 Qtr 3/16/2005 Monitor well was not installed 2nd Otr 5/25/2005 NA 192 NA NA NA 14.6 3r4 Qtr 8/31/2005 <5.0 78 <5.0 <5.0 NA 10.1 41h Qtr 12/7/2005 <1.0 86 <1.0 <1.0 353 9.6 1st Qtr 3/9/2006 <2.5 120 <2.5 <2.5 347 8.5 2nd Qtr 6/14/2066 <2.5 120 <2.5 <2.5 318 10.2 ard Qtr 7/20/2066 <2.5 108 <2.5 <2.5 357 8.9 4th Qtr 2 139 <1.0 <1C 296 8.7 1st Qtr 2/28/2007 1.8 160 <1.0 <1.0 3 06 8.7 20d Qtr 6/27/2007 5.8 300 <1.0 <1.0 327 8.6 3rd Qtr 8/15/2007 <1.0 140 <1.0 <1C 300 8.6

r 103/105//22000075 4itsht

oCittt /2 <1.0 120 <1.0 <1C 288 8.3 7 390 <1.0 <1.0 331 14.3 2nd Otr 6/25/2008 1.7 180 <1.0 <1.0 271 8.8 3rel Qtr 9/10/2008 1.6 120 <1.0 <1.0 244 7.57 41h Qtr 10/15/2008 NA #N/A NA NA 284 8.0 11/18/2008 2 170 <2.0 <2.0 NA #N/A 1st Qtr 3/11/2009 <1.0 180 <1.0 <1.0 279 8.3 2nd Qtr 6/23/2009 <1.0 200 <1.0 <1.0 291 8.1 3rd Qtr 9/14/2009 <1.0 200 <1.0 <1.0 281 9.2 4th Oft 12/22/2009 <1.0 161..<1.0 <1.0 256 8A 1st Qtr 2/25/2010 <1.0 170 <1.0 <1.0 228 8.4 2ng Qtr 6/14/2010 <1.0 210 . <1.0 <1.0 266 12.0 3rd Qtr 8/13/2010 9.2 390 <1.0 <1.0 278 14.0 4th Qtr 10/15/2010 1 2 *...200 o _<1 <1 0 7 0 1st Qtr 2/22/2011 1.2 230 <1.0 <1.0 2103 30 9.0 2nd Qtr 6/28/2011 4.8 290 <1.0 <1.0 290 12.0 3rd Qtr 8/17/2011 6.3 460 <1.0 <1.0 287 14.0 415 Qtr 11/16/2011 287 13.0 (1) 1217/2011 6.7 390 <1.0 <1.0 1irafFT21 1/23/2012 - 6A 420 <1.0 <1.0 •• 228 15.0
d Qtr 6/6/2012 5.4 400 <1.0 <1.0 285 11.0 3rd Qtr 9/4/2012 6 410 <1.0 <1.0 142 13.0 4th Qtr 10/3/2012 7 390 <1.0 <1.0 270 14.0 1st Qtr 2/11/2013 5.25 282 <1.0 <1.0 221 1178 2nd Qtr 6/5/2013 3.49 328 <1.0 <1.0 243 13.8 3rd Qtr 9/3/2013 2.13 244 <1.0 <1.0 207 10.3 4th Qtr 10/29/2013 <1.0 204 <1.0 <1.0 9.0 1st Otr 1/27/2014 6.23 .220 <1.0 2.04 20060 2 11.4 2nd Qtr 5/19/2014 4.73 240 <1.0 2.04 243 11.5 3rd Qtr 8/11/2014 <1.0 204 <1.0 <1.0 230 7.1 41h Qtr 1W21/2014 229 <1.0 <1.0 252 10.0
1st Qtr 3/9/2015
1..0745
292 <1.0 <1.0 255 10.9 2nd Qtr (3) 6/8/2015 1.92 366 <1.0 <1.0 494 13.1
1rd Qtr 8/31/2015 -01.0 281 <1.0 <1.0 499 14.7 4th Qtr 10/31/99//22001158
1st Qtr . <
1..00 339 ;.11 .0
396-<1.0 «<11 ..09 445132_ 14.3 14.6 2nd Qtr 5/23/2016 <1.0 545 <1.0 <1.0 425 13.1 3rd Qtr 7/25/2016 <1.0 456 <1.0 <1.0 457 16.5 4th Qtr 10/31/82//22001167 <1.0 456 <1.0 <1.0 439 1 .....1§ 1st Qtr 2.36 598 <1.0 <1.0 452 17.7 2nd Qtr 6/13/2017 1.16 224 <1.0 01.0. 309 9.53 3rd Qtr 7/26/2017 1.05 537 <1.0 <1.0 447 18.20
4t5 Qtr 10/11/2017 <1.0 466 <1.0 <1.0 378 16.90
<3.8 400 <6.0 14 J 310 11 01 MQRtrQ"""TIC'3/12/2018 swt 2.36 421 <1.0 <1.0 447 15.8 2nd Qtr 6/8/2018 <1.0 532 <1.0 <1.0 . 387 14.1 3rd Qtr 8/22/2018 <1.0 476 <1.0 <1.0 182 0.236

r 10/22/2018

41 tsht QQtt t 3/8/2019 <1.0 <1.0 585 323 <1.0 <1.0 <1.0 <1.0 15
. 319820
53t
2n4 Qtr 6/5/2019 <1.0 734 <1.0 <1.0 456 17.5 3rd Qtr 9/4/2019 <1.0 596 <1.0 <1.0 478 14.7 41h Qtr 12/10/2019 <1.0 794 <1.0 <1.0 339 5.73 1st Qtr 2/19/2020 <1.0 844 2.58 <1.0 446 8.93 2nci Qtr 5/27/2020 <1.0 767 <1.0 <1.0 353 15.4 3rd Qtr 9/4/2020 <1.0 920 <1.0 <1.0 382 12.6 4t11 Qtr 10/28/2020 <1.0 948 <1.0 <1.0 411 16.3 1st Qtr 2/23/2021 <1.0 400 <1.0 <1.0 454 . 15.20 2nd Qtr 6/9/2021 <1.0 1,130 <1.0 <1.0 461 21.5
(I) VOCe were nsarnpled because laboratory mtssed holding trne (2) As of March 2012 both north and south wild llfe ponds no longer receivIng water.
13:EcTsFs'ororns purnOng well started 819/15.
NA .7n7;;;Iyeed Shaded indicates concentrations exceeding GWC/S. J = Approximated value
TABLE 1 (23 of 31)
Historic Summary Of Monitoring Well Analytical Results Up To The 2nd 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 -1- Nitrite
(10 mg/L)
1st Qtr 3/18/2005 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 <5.0 <5.0 253 15.1 1st Qtr 3/9/2008 <10 33280
0 <10 <10 236 15.3
2nd Qtr 6/14/2006 <10 280 <10 <10 221 14.3 3r4 Qtr 7/20/2006 <10 864 <10 <10 221 14.5 4th Qtr 11/8/2006 <1.0 1.6 <1.0 15.9_ 15t Qtr 2/28/2007 <1.0 50 3440 <1.0 <1.0 2367 34 20.9 2nd Qtr 6/27/2007 <1.0 740 <1.0 <1.0 273 19.3 3r4 Qtr 8/15/2007 <1.0 530 <1.0 <1.0 259 19.3 4th Qtr 10/10/2007 <1.0 440 <1.0 18.8 15t Qtr 3/28/2008 <1.0 1,400 <1.0 5 11.. i:0 23180 5 39.f 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 2n4 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 81.0 380 <1.0 <1.0 17.8 1st Qtr 3/2312010 <1.0 2.200 <1.0 <1.0 17 4275 38.8 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 1st 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 "1i)-CitR2 1 /19i20-121b 200 <1.0 <1.0 3 14.0
Ind Qtr 6/13/2012 <1.0 120 <1.0 <1.0 35 12.8 314 Qtr 9/12/2012 <1.0 121 <1.0 <1.0 7.0 4t5 Qtr 10/4/2012 <1.0 330 <1.0 <1.0 130 14.0
71st Qtr (3) 2/11/2013 - 3.24 10,600 <1.0 <1.0 130 58.0 20d Qtr 6/5/2013 3.35 12,500 <1.0 <1.0 586 50.2 3r4 Qtr 9/3/2013 3.25 9,840 <1.0 <1.0 487 29.7 8.09 13,300 <1.0 <1.0 501 45.2 4il
t
3 Qtr 101//2297//20114 1

Q.tr 20 6.06 12,100 <1.0 2.83 598 54.6 2nd Otr 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 41h Qtr 10/29/2014 3.32 12.400 1.61 <1.0 596 54.9 151 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 _/530 5 1 <1.0 56.1 _ 1st Qtr 3/9/2016 <1.0 6,070 <1.0 <1.0
56873
5 -31.1 2nd Qtr 5/23/2016 2.64 8,570 <1.0 <1.0 598 58.4
3r4 Qtr 7/25/2016 <1.0 5,840 <1.0 <1.0 619 61.3 41h 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 20d 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 DWMRC splr.t sample <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„,§80 <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 3r4 Qtr 9/4/2019 <1.0 3,460 <1.0 <1.0 588 72.5 4th Qtr 12/10/2019
1st Qtr 2/19/2020
<1.0
1.02 ..g0 A 3,910 <1.0 <1.0
<1.0
<1.0 680088 59.9 57.7
2nd Qtr 5/27/2020 <1.0 2,530 <1.0 <1.0 578 60.5 3n4 Qtr 9/4/2020 <1.0 3,760 <1.0 <1.0 514 64.8 4t 0/2 6.83 3,640 <1.0 <1.0 523 64 9
12/283/
/2200220
r
r
1 s th 01
Q tt
1 <1.0 5,100 <1.0 <1.0 818 89.8 294 Qtr 6/9/2021 <1.0 4,520 <1.0 <1.0 408 89.3
(1) VOCs wens resampled because laboratory missed holding time. (2) As of March 2012 both north and south wild lite ponds no longer receiving water.
i3LChlorotonnernping_well started 1/26113
NA, = not analyzed Shaded indicates concentrations exceeding GWOS, Bold and defies indicates the MDL exceeded bye GWOS. J =Approxtmated value
TABLE 1 (24 of 31)
Historic Summary Of Monitoring Well Analytical Results Up To The 2nd Oarter 2021 Chloroform Contamination Investigation DUSA White Mesa Mill
1W4-23 Sampling Event Parameter (GWOS)
Carbon Tetrachlonde (5 pg/L) Chlorofonn (70 pg/L) Chloromethane (30 pg/L) Methylene Chloride (5 pg/L) Chloride No GWOS (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
41h 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 8/25/2008 <1.0 <1.0 <1.0 <1.0 41 <0.1 3rd Qtr 9/10/2008 <1.0 <1.0 <1D <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 Car 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 25d 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 41h Qtr 10/15/2010 <1.0 <1.0 <1.0 <1.0 34 <0.1 1st Qtr 2/16/2011 <1.0 <1.0 <1D <1.0 44 <0.1 2nd Qtr 6/14/2011 <1.0 <1.0 <1.0 <1.0 44 <0.1 3r4 Qtr 8/16/2011 <1.0 <1.0 <1.0 <1.0 41 <0.1 4th Qtr f sf a 0 ) 11. 1// 1157;22001121 <<11 .. 00 <1.0 <1.0 <1.0 <1.0 <1.0 <1.0 43 40 <0.1 <0.1
2nd Qtr 5/31/2012 <1.0 <1.0 <1,0 <1.0 44 <0.1 3r4 Qtr 8/29/2012 <1.0 <1.0 <1.0 <1.0 46 <0.1 <1.0 <1.0 <1.0 <1.0 45 <0.1 41111 10/3/2012 Qatt rr 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 Otr 9/5/2013 <1.0 <1.0 <1.0 <1.0 48 <0.1 41 tsht QtQtrr 11/7/2013 1/23/2014 <1.0 <1.0 <1.0 <1.0 43 44.6 <0.1 <0.1 <1.0 :11.00 <1.0 2nd QV 5/19/2014 <1.0 <1.0 <1.0 42.3 <0.1 3rd Qtr 8/13/2014 <1.0 <1.0 <1.0 <1.0 <
<11
.
.0
0 46 <0.1 4h O 10/28/2014 <1.0 <1.0 <1.0 46.8 <0.1 tst clttrr 1 3/12/2015 <1.0 <1.0 <1.0 <1.0 471 <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 Duplicate WV4-70 <1.0 <1.0 <1.0 <1.0 46.4 <0.1
lstotr 3/16/2016 <1.0 <1.0 <1.0 <1.0 49.1 <0.1
2nd Ger 5/26/2016 <1.0 <1.0 <1.0 <1.0 50.4 <0.1 3rd Qtr 8/23/2016 41.0 <1.0 <1.0 <1.0 49.6 <0.1
Duplicate 7W4-70 <1,0 <1.0 <1.0 <1.0 48.3 <0.1
Otr 10/12/2016 <1,0 <1.0 <1.0 <1.0 52.1 <0.1
1
4th 1st Otr 3/15/2017 <1.0 <1.0 <1.0 <1.0 47.7 <0.1
Duplicate 7,A14-70 <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
EM/M6..Q.Ket sarepla_. <1.0 <1.0 <2.0 <2.0 52 <0.1
Qtr 3/.14/2018 <1.0 <1.0 <1.0 <1.0 53.8 <0.1
1
1st 2nd Otr 6/13/2018 <1.0 41,0 <1.0 <1.0 47.6 <0.1 Duplicate 7W4-70 <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 40.1 4111 caQtt 12/12/2018 rr 3/18/2019 <1.0 41.0 <1.0 <1.0 <1 0 <1.0 <1 0 <1.0 ..... 54.9 48.9 <0.1 <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 <1.0 <1.0 <1.0 <1.0 <1.0
<1.0 <1.0 54.4 50.0 <0.1 <0.1 41 ts 12/10/2019 tt r th c IQ i 3/17/2020 <1.0 2nd Car 8/11/2020 <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 41h Qtr 11/4/2020 1st Qtr 3/17/2021 <1.0 <1.0 <1 .1..0 0 <1.0 <1.0 <1.0 <1.0
49.3 51.6 <0.1 <0.1
2nd Qtr 6/16/2021 <1.0 <1.0 <1.0 <1.0 48.8 <0.1 (1) As of March 2612
-17n3i 1-,,zreF Shaded indicates concentrations exceeding GWCIS. J = Agorcuarnated value.
TABLE 1 (25 of 31)
Historic Summary Of Monitoring Well Analytical Results Up To The 2nd Qarter 2021 Chloroform Contamination investigation
DUSA White Mesa Mill
TW4-24 (nitrate pumping well started 1/26/13) Sampling Event
Parameter
(GWQS)
Carbon Tetrachloride
(5 pg/L)
Chloroform
(70 pg/L)
Chloromethane
(30 0904
Methylene Chloride
(6 pg/L)
Chloride
No GWQS (mg/L)
Nitrate, Nitrate . Nitrite
110 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 <1C 24.7 1st Qtr 3/28/2008 <1.0 1.5 <1.0 <1.0 6 7942 0 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 QV 10/15/2008 NA gN/A NA NA 1,130 44.8 11/18/2008 <2.0 <2.0 <2.0 <2.0 gNIA N/A 1st Qtr 3/4/2009 <1.0 1.4 <1.0 <1.0 1,010 30.5 2nd Qtr 8/23/2009 <1.0 1.5 <1.0 <1.0 759 30.4 r 9/14/2009 <1.0 1.4 <1.0 <1.0 618 30.7 41 tsh/ oiltr 12/16/2009
3/25/2010
<1.0
<1.0
1.2
1.3
<1.0
<1.0
<1.0
<1.0 1,068906 28.3 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 41h Qtr 11/15/2011 NA itN/A NA NA 608 35 (1) 12/7/2011 <10 1.2 <1.0 <1.0 gN/A riN/A firafF(2) 1/16/2012 <1.0 <1.0 <1.0 <1.0
2nd Qtr 6/6/2012 <1.0 <1.0 <1.0 <1.0 355 37 3r4 Qtr 8/30/2012 <1.0 <1.0 <1.0 <1.0 489 37 4th Qtr 10/3/2012 <1 0 1 < 0 <1 0 405 38
1st Qtr (3) 2/11/2013 <1.0 1
1
.0 <1 <1.0 1,260 35.9 2nd Otr 6/5/2013 <1.0 17.4 <1.0 <1.0 916 23.7 3rid Qtr 8/30/2013 <1.0 21.8 <1.0 <1.0 998 33 4th Qtr 191//22971/22901143 1st Qtr <1.9 1.18 32.5 78.5 <1.0 <1.0 <1.0 <1.0 1,083009 35 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 15t 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 41 t
s
h/ QQ tt
r
i. <<11:00 25.3 <1.0 29.8 10/31/99//22001165
22.8 <1.0 «<11..90 996099 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 . . <1.0 1,010 4th Qtr 10/1/2/2001167
1st Qtr 3
<<110 18.3 <1.0 <1.0 1,090 3411..39 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 DWMIRCALlit sample <0.38 36.0 <0.60 1.3 J 1,100 32.0 15t 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 DWMRC splits_atfip/a ,1§.....0 60 <5.0 <5.0 1,000 34.0 1st Qtr 3/8/2019 <1.0 28.1 <1.0 <1.0 1,040 39.3 2nd Qtr 6/5/2019 <1.0 28.8 <1.0 <1.0 1,020 33.2 3rd Qtr 9/4/2019 <1.0 31.1 <1.0 <1.0 1.130 36.4 12/10/2019 41 t
s
h/ <1.0 43.3 <1.0 <1.0 1.090 33.8 QQtt /r 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: 4t6 Qtr 10/28/2020 <1.0 72.6 <1.0 <1.0 1,050 35.9: 1st Qtr 2/23/2021 <1.0 96.2 3.6 <1.0 1,170 419 : 2nd Qtr 6/9/2021 <1.0 41.9 <10 <1.0 938 48.0:
(1) VOCs were resampled because laboratory rnbsed holding time. (2) As of March 2012 both north and south wild life ponds no longer . receiving water.
13LChloroforrn Liumpinjwell started 1/26/13. NA xi not analyzed Shaded indicates concentrations exceeding GINOS. J = Approximated value
TABLE 1 (26 of 31)
Histonc Summary Of Monitoring Well Analytical Results Up To The 2nd Qarter 2021
Chlorofomi Contamination Investigation DUSA White Mesa Mill
TW4-25 (nitrate pumping well started 1)26/13) Sampling Event
Parameter
(GWQS)
Carbon Tetrachloride
(5 pg/L)
Chloroform
(TO PO-)
Chloromethane
(30 pg/L)
Methylene Chloride
(5 pg/L)
Chloride
No GWQS (mg/L)
Nitrate, Nitrate 4- Nitrite
(10 mg/L) 2n4 Qtr 6/27/2007 01.0 <1.0 <1.0 <1.0 395 17.1 3rd Qtr 8/15/2007 <1.0 2.2 <1.0 <1.0 382 29 41 tsht 10/10/2007 <1.0 <1.0 <1.0 <1.0 358 17 QC! it rr 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 22.1 318 Qtr 9/10/2008 <1.0 <1.0 <1.0 <1.0 333 18.8 410 Qtr 10/15/2008 NA *N/A NA NA 366 21.3 11/18/2008 <2.0 <2.0 <2.0 <2.0 ifN/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 3.3 415 Qtr 12/16/2009 <1.0 <1O <1O <1.0 371 1.4.,2
1s1 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
1st Qtr 2/16/2011 <1.0 1.8 <1.0 <1.0 315 14
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
111 4th Qtr fit CIFT2I 11/15/2011 1/16/2012 <1.0 <1.0 <1.0 <1.0 <1.0 <1.0 <1.0 <1.0 294 304 ----
Ind Qtr 5/31/2012 <1.0 <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 10/3/2012 <1.0 <1.0 <1.0 <1.0 338 17
1 st Qtr (3) 2/11/2013 <1.0 <1.0 <1.0 <1.0 190 9.04 2n4 Qtr 6/5/2013 <1.0 <1.0 <1.0 <1.0 136 5.24 3n8 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 Otr 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
4111.9.1r_ lst Qtr 1912..112014 3/9/2015 .1.,9__. <1.0
<1.0
<1.0 0 :1 ..0 <1.0
<1.0 58.1 310 1.03
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
t_ v itti, t4tir to/179/2015 3 /2016 <1.0 <1.0 <1.0 <1.0 <1.0 <1.0 <1.0 <1.0 93.7 62.7 1.78 0.837 2n4 Qtr 5/23/2016 <1.0 <1.0 <1.0 <1.0 75.5 0.959 3r4 Qtr 7/25/2016 <1.0 <1.0 <1.0 <1.0 74.1 1.78
41 tht 0 Qtt
r
r
s
10/12/2016
3/8/2017
<1.0
<1.0 1.15
<1.0
<1.0
<1.0
<1.0
<1.0 59.8
285
1.24
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
4h 10/11/2017 <1.0 <1.0 <1.0 <1.0 q§.:P. 1.29 t
st 1

c I
CI tt
3/12/2018 <1.0 1.15 r
r
<1O <1.0 1:1.5 2.23
2nd Qtr 6/14/2018 <1.0 <1.0 <1,0 <1.0 60.3 1.14
3r4 Qtr 8/22/2018 <1.0 <1.0 <1.0 <1.0 69.1 0.810 41 tsht caQttrr 11/28/2018 3/8/2019 <1.0 , <1.0 <<11..00 <1.0 <1.0 :1:00 59.7 65 _ 06,634 .21 2nd Qtr 6/5/2019 <1.0 <1.0 <1.0 <1.0 59 0.821 318 Qtr 9/4/2019 <1.0 <1.0 <1.0 <1.0 58.1 0.548 r 41 tht cltQtr s 12/10/2019 2/19/2020 <1.0 <1.0 <1.0 <1.0 <1.0 <1.0 <1.0 <1.0 73.1 86.0 0.841 0.607 2nd Qtr 5/27/2020 <1.0 <1.0 <1.0 <1.0 76.8 0.851 3r4 Qtr 9/4/2020 <1.0 <1.0 <1.0 <1.0 67.3 0.994 41h Qtr 10/28/2020 <1.0 <1O <1.0 <1.0 6.1....3 . 1.84 1s1 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
(1) VOCs were resarnpled because laboratory missed holding time. (2) As of March 2012 both north and south wild life ponds no longer receiving water
131.Ch6rrifortnEurnpinivell started 1/26/13
NA ix not analyzed
Shaded indicates concentrabons exceeding GWQS.
TW4-26 Sampling Event
2nd Qtr 6/14/2010 3rd Qtr 8/24/2010 4th Qtr 10/15/2010 1st Qtr 2/16/2011 2n4 Qtr 5/26/2011 3r4 Qtr 8/17/2011 4th Qtr 11/16/2011 CI) 12/7/2011 1it Qt/(2) 1/18/2012
2nd Qtr 6/6/2012 3rd Qtr 9/11/2012 4th Qtr 10/3/2012 1N Qtr 2/11/2013 2nd Qtr 6/13/2013 31d Qtr 9/5/2013 !`it::.Ttrr 11;fZ 1,34 2nd Qtr 5/21/2014 3rd Qtr 8/11/2014 4th Qtr 1=11: 1st Qtr 2nd Qtr 6/10/2015 3rd Qtr 9/3/2015 4th Qtr 1/g11: lst Qtr 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 Otr 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 2n4 Qtr 6/17/2021
TW4-27
far Citr(5) 1/18/2012
2nd Qtr 6/13/2012 3r4 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
10/28/2014 41 t
sth ca
Qtt
3/11/2015
2nd Qtr 6/10/2015
3rd Qtr 9/2/2015
4t5 Qtr 103//2186//220015
1st Qtr 16
2n4 Qtr 5/26/2016
3rd Qtr 8/3/2016 4t5 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 25d Qtr 6/13/2018 3r4 Qtr 8/30/2018 12/12/2018 41 tsht (3Qttrr 3/16/2019 2nd Qtr 6/13/2019 3r4 Qtr 9/11/2019 12/14/2019 41 tsht QQttrr 3/18/2020 2nd Qtr 6/11/2020 3M Qtr 9/18/2020 4th Qtr 11/4/2020
1st Qtr 3/18/2021
20d Qtr 6/17/2021
Parameter (GWOS) Carbon Tetrachloride
(5 pg/L)
<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 <1.0 <1.0 <1.0
<1.0
<1.0 <1D <1.0
<1.0
<1.0 <1.0
<1.0 <1.0 <1.0 <1.0
<1.0 <1.0
,s1.0 <1.0 <1.0 <1.0 <1.0 <1.0 <1.0 <1.0 <1.0 <1.0 <1.0 <1.0 <1.0 <1.0 <1 0 <1.0 <1.0 <1.0 <1 0
Chlorofoim
(70 pg/L)
13 5.2 5.4 2 2.9 2.8 PN/A 5.2 7
4.1
4.9 4.9 4.9 2.12 2.81
3.37
1.43
4.23
1.3
2.45 2.37 6.12 4.77 3.4.5 18 8.23 4.42 19.9 46.1 244 419 608 1,050 960 916 1,050
963
1,070
877 1,070 1 090 1,140 1120 1,160 1,030 1,020
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
1.3
21 6 11 3.16 2.78 3.8 4.33 5.65 6.05 5.91 6.95 5.95 7.35 7.7 6.54 8.24 7.58 7.97 8.04 7.92 5.62
7.8
4.66 4.26
Chloromethane
(30 pg/L)
<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
:11.00
1.17 <1.0
..00
<1.0 <1.0 <1.0 <1.0 <1.0 <1,0
<1.0
<1.0 <1.0 <1.0 <1.0
<1.0
<1.0 <1.0 <1.0 <1.0 <1.0 <1.0 <1.0 <1.0 <1.0
<1 0
<1.0 <1.0 <1.0 <1.0
<1.0
<1.0
<1.0
<1.0 <1.0
<1.0
<1.0
<1.0
<1.0
<1.0 <1 0 <1 0
<1 0 <1 0 <1 0 <1.0 <1.0 <1.0 <1.0 <1.0 <1.0 <1 0 <1.0 <1.0 <1.0 <1.0 <1 0
<1 0
<1 0 <1,0
<1 0
<1.0 <1.0
Methylene Chloride
(5 pg/L) <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 10 <1.0 <1.0 <1.0 <1.0 <1.0 <1.0
<2 0 .0
<1.0 <1 0
<1.0
<1.0
<1.0
<1 0 <11.0
<0 <1.0 <1.0 <1.0 <1.0 <1.0
<1 0
<1 0 <1.0 <1.0 <1 0 <1 0
<1 0 <1.0 <1.0 <1 0
<1 0
<1 0 <1.0
<1.0
<1.0 <1 0 <1 0 <1.0 <1.0 <1 0 <1.0 <1.0 <1.0 <1 0 <1.0 <1.0 <1.0 <1.0 <1.0 <1.0 <1.0 <1.0 <1.0 <1.0 <1.0 <1.0
<1.0 <1.0
Chloride
No GWOS (mg/L) 33 17 22 30 15 19 26 PN/A 17
19
19
19 16.6 14.5 17.6 15.9 16.9 15.4 15 14.6 14.4 14.4 14 13.3 13.7 15.2 13.9 14.2 16.2 19 25.8 27.3 35.5 33.5 38.9
33.4
32.9
35.8
32.0
38.3 36.3 35.1 34.8 36.3 38.9 34
11
17 21 18 18.8 20.3 19 21.8 31.8 20.6 23 24 4
6.2 2
26.8
26.8
26.2
28
21.2
27.1 298..4 23 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
Nitrate, Nitrate + Nitrite
(10 mg/L) 7.9 9.0 9.6 10.0 10.0 11.0 10.0 aN/A 11.0
12.0
9.0
12.0 12.5 13.6 11.7 15.9 14.2 12.5 10.8 12.3 14.4 11.3 14.2 13.9 16.9 13.9 17.9 15.0 15.8 15.2 15.2 10.0 12.2 13.2 13.5 11.8 12.2 12.6
10.9 10.3 11.9 11.1 10.5 11.9 11.3 14.2
24.0
41.0 37.0 36.0 31.2 29.4 27.2 29.8 .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 11,5. 19.5 22.0 18.1 20.8 21.5 22.3 21.2 223..0 2 6 21.5 25.2 16.7
23.0
23.8
TABLE 1 (27 of 31)
Historic Summary Of Monitoring Well Analytical Results Up To The 2nd ()after 2021
Chloroform Contamination Investigation DUSA White Mesa Mill
(1) VOCs were resarnpled because laboratory missed holding time. (2) As of March 2012 both north and honds no longer receiving water.
NA = not analyzed
Shaded indicates concenttabons exceeding GWQS
TABLE 1 (28 of 31)
Historic Summary Of Monitoring Well Analytical Results Up To The 2nd Qarter 2021
Chloroform Contamination Investigation
DUSA White Mesa Mill
TW4-28
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) 2n4 Qtr 6/19/2013 <1.0 <1.0 <1.0 <1.0 44.6 14.9 3r4 Qtr 8/29/2013 <1.0 <1.0 <1.0 <1.0 45.3 17.3 4th Qtr 11/6/2013 <1.0 <1.0 <1.0 <1.0 45.3 16.2 1st Qtr 1/22/2014 <1.0 <1.0 <1.0 <1.0 47.8 16.9 2n4 Qtr 5/21/2014 <1.0 <1.0 <1.0 <1.0 45.7 16.5 3r4 Qtr 8/13/2014 <1.0 <1.0 <1.0 <1.0 50 14.2 4th Qtr 10/23/2014 .1 0 <1.0 <1.0 <1.0 52.1 16.5 1st Qtr 3/11/2015 51.0 <1.0 <1.0 <1.0 52.2 19.0 2nd Qtr 6/10/2015 <1.0 <1.0 <1.0 <1.0 56.4 19.0 3rd Qtr 9/2/2015 <1.0 <1.0 <1.0 <1.0 61.4 17.8 41 lilt QQttrr 130//2101//22001165 2:00 <1.0 <1.0 21..00 <2..00
61.6 .7 34.0 Duplicate TW4-65 <1.0 <1.0 <1.0 <1.0 61.4 32.6 2nd Qtr 5/25/2016 <1.0 <1.0 <1.0 <1.0 67.1 29.0 3rd Qtr 7/27/2016 <1.0 <1.0 <1.0 <1.0 70.1 31.3 Duplicate TW4-65 <1.0 <1.0 <1.0 <1.0 70.9 35.6 4th Qtr 10/19/2016 <1.0 <1.0 <1.0 <1.0 70.9 25.5 Duplicate TW4-65 <1.0 <1.0 <1.0 <1.0 73.7 25.4 1st Qtr 3/14/2017 <1.0 <1.0 <1.0 <1.0 64.2 24.4 Duplicate TW4-65 <1.0 <1.0 <1.0 <1.0 66.4 27.9 2nd Qtr 6/14/2017 01.0 <1.0 <1.0 <1.0 68.6 26.0 31d Qtr 7/27/2017 <1.0 <1.0 <1.0 <1.0 67.1 24.8
41 t
sht QQtttr 103//11041/22001170 2 :00
2..00
<1.0
<1.0
<1.0
<1.0
57.4
65.0
24.8
17.2
2nd Qtr 6/12/2018 <1.0 <1.0 <1.0 <1.0 55.7 19.0
Duplicate TW4-66 01.0 <1.0 <1.0 <1.0 56.7 18.7 3r4 Qtr 8/29/2018 <1.0 <1.0 <1.0 <1.0 63.8 16.0
4th Qtr 11/30/2018 <1.0 <1.0 <1.0 <1.0 52.4 17.7
1st Qtr 3/16/2019 <1.0 <1.0 <1.0 <1.0 51.7 17.2
29d Qtr 6/13/2019 <1.0 <1.0 <1.0 <1.0 51.8 15.0
3rd Qtr 9/11/2019 <1.0 <1.0 <1.0 <1.0 49.0 10.2 <1.0 <1.0 <1.0 9.48 4th Qtr 132//1172//22002190
1st Qtr
<2..00
<1.0 <1.0 <1.0 5520..01 9.87
25d Qtr 6/10/2020 <1.0 <1.0 <1.0 <1.0 49.8 9.55
3rd Qtr 9/17/2020 <1.0 <1.0 <1.0 <1.0 47.4 8.36 4th Qtr 11/4/2020 <1.0 <1.0 <1.0 <1.0 - 49.0 7.76 1st Qtr 3/17/2021 <1.0 <1.0 <1.0 <1.0 51.8 8.68 2nd Qtr 6/15/2021 <1.0 <1.0 <1.0 <1.0 48.5 9.09
TW4-29
2nd Qtr 6/19/2013 <1.0 242 <1.0 <1.0 44.8 4.60
2nd Qtr 7/11/2013 <1.0 262 <1.0 <1.0 37.7 3.52
3rd Qtr 9/26/2013 <1.0 246 <1.0 <1.0 41.4 4.18
41h Otr 11/13/2013 <1.0 260 <1.0 <1.0 42.5 .111, 151 Qtr 2/5/2014 <1.0 258 <1.0 <1.0 14.9 4.63
2n4 Qtr 5/22/2014 <1.0 262 <1.0 <1.0 38.2 3.52
3rd Qtr 8/27/2014 <1.0 242 <1.0 <1.0 41 3.40
4th Qtr 10/29/2014 <1.0 290 <1.0 <1.0 41 3.64
1st Qtr 3/12/2015 <1.0 299 <1.0 <1.0 40.5 4.14
2n4 Qtr 6/11/2015 <1.0 329 <1.0 <1.0 42.5 2.95 3rd Qtr 9/3/2015 <1.0 276 <1.0 <1.0 47.3 2.19 4th Qtr 130//2197//22001156 1st Qtr <2..00 631 335 <1.0 <1.0 <1.0 <1.0 39.8 40.5 2.74 2.92 2n4 Qtr 6/8/2016 <1.0 366 <1.0 <1.0 42.9 2.51 3rd Qtr 8/3/2016 <1.0 401 <1.0 <1.0 40.6 2.44 41h Qtr 10/26/2016 <1.0 392 <1.0 <1.0 44.2 2.40 1st Qtr 3/16/2017 <1.0 446 <1.0 <1.0 41.5 2.24 2n5 Qtr 6/4/2017 <1.0 420 <1.0 <1.0 42 2.26 3rd Qtr 8/4/2017 <1.0 466 <1.0 <1.0 42.9 2.35
4th Qtr 10/11/2017 <1.0 431 <1.0 <1.0 2.45
1st Qtr 3/14/2018 <1.0 533 <1.0 <1.0 3 73. .7 4 1 2.44
2nd Qtr 6/14/2018 <1.0 474 <1.0 <1.0 40.1 2.67
3rd Qtr 8/29/2018 <1.0 454 <1.0 <1.0 45.9 2.52
4th Qtr 2/13/2018 <1.0 521 <1.0 <1.0 40.9 2.50
1st Qtr 3/20/2019 <1.0 507 <1.0 <1.0 39.9 2.67
2n5 Qtr 6/13/2019 <1.0 537 <1.0 01.0 39.4 2.56
3rd Qtr 9/12/2019 <1.0 549 <1.0 <1.0 38 2.55
4th Qtr 12/18/2019 <1.0 630 <1.0 <1.0 2.58
1st Qtr 3/18/2020 <1.0 652 <1.0 <1.0
44.8
1 4 3.10
2nd Qtr 6/12/2020 <1.0 686 <1.0 <1.0 42.2 3.18
3r4 Qtr 9/19/2020 <1.0 621 <1.0 <1.0 39.9 2.90
4th Qtr 11/11/2020 <1.0 671 <1.0 <1.0 40.8 3.27
DWMRC sp[4 sample <10 670 <20 <20 42 0.75 H
1 sr Cgr 3/24/2021 <1.0 577 <1.0 <1.0 44.3 3.09 2n4 Qtr 6/17/2021 <1.0 543 <1.0 <1.0 40 3.59
H = Sarn le was anal zed be ond holdist times and nwv not be accureate concentration.
TW4-30
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 2n4 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 . 2.1.5
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
3.48 <1.0 <1.0 37.8 1.86 4th Qtr 103//2
187//22001156 1st Qtr
:11..00
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 Qtr 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
2n4 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 2n4 Qtr 6/13/2018 <1.0 16.9 <1.0 <1.0 37.4 3.93 3rd Qtr 8/30/2018 <1.0 19.8 <1.0 <1.0 44.1 3.79
<1.0 23.9 <1.0 <1.0 35.5 ..17.9 41 tsh Q 12/12/2018 rr t Q tt 3/15/2019 <1.0 25.3 <1.0 <1.0 35.9 4.05
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
25d Qtr 6/12/2020 <1.0 65.4 <1.0 <1.0 38.6 3.69
3rel Qtr 9/18/2020 <1.0 67.7 <1.0 <1.0 35 3.49
4th Qtr 11/11/2020 <1.0 82.8 <1.0 <1.0 37.1 3.64 ovvwc. split sarnpl,e. <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
2n4 Qtr 6/17/2021 <1.0 78.7 <1.0 <1.0 38.3 4.19
Shaded indicates concentrations exceeding GWQS.
H = Sample was analyzed beyond holding times and may not be accureata concentration.
TABLE 1 (29 of 31) Historic Summary Of Monitoring Well Analytical Results Up To The 2nd Qarter 2021
Chloroform Contamination investigation
DUSA White Mesa Mill
TW4-31
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 28.4 1.3
3rd Qtr 9/5/2013 <1.0 <1.0 <1.0 <1.0 29.4 1.1
11/7/2013 <1.0 <1.0 <1.0 <1.0 28 1.33 41 t
s
ht QQ tt
r
r
1/23/2014 <1.0 <1.0 <t0 <1.0 28.5 1.32
2nd Qtr 5P21/2014 <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 41 ilt QQtt rr 03//2181//22001145 <<11 :00 <1.0 <1.0 <1.0 <1.0 <1.0 <1.0 37.1 30.6 1.84 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 4th Qtr 10/21/2015_<1.0 <1.0 <1.0 <1.0 _ 29.1 0.953 1st Qtr 3/11/2016 Z1.0 <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 3rd Qtr 7/28/2016 <1.0 <1.0 <1.0 <1.0 30.6 1.41 4th Qtr 10/20/2016 1st Qtr 3/15/2017 <1.0 <1.0 <1.0 <1.0 <1.0 <1.0 <1.0 <1.0 34 31.3 1.1149 1. 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 10/10/2017 4111: clQttir 3/14/2018 <1.0 <1.0
<1.0
<1.0
<21..00 :11..00 30.9 38.8 1.04 0.916 28d 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 2/12/2018 <1.0 <1.0 <1.0 <1.0 35.2 00..72656 4 1st Qtr 3/16/2019 <1.0 <1.0 <1.0 <1.0 35 . 2nd Qtr 6/13/2019 <1.0 <1.0 <1.0 <1.0 36.9 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 40.6 0.58
1st Qtr 3/17/2020 <1.0 <1.0 <1.0 <2160 38.2 0.572
2nd Qtr 6/12/2020 <1.0 <1.0 <1.0 <1.0 36.7 0.569
3r4 Qtr 9/17/2020 <1.0 <1.0 <1.0 <1.0 36.5 0.51
4th Qtr 11/4/2020 1st Qtr 3/17/2021 <1.0 <1.0 11.. <1.0
<1.0
<1.0
<1.0
36.4
40.3
0.501 0.501
2nd Qtr 6/16/2021 <1.0 <1.0 <1.0 <1.0 37.9 0.451
TW4-32 4th Qtr 11/14/2013 1st Qtr 1/22/2014 <1.0 <1.0 <1.0 <1.0 <1.0 <1.0 <1.0 <1.0 52.1 54.5 45..2161 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 TW4-85 <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
<1 0 <1.0 55.1 1.19 ..411,th oQttrr _ _ 103mil...<21
.
00 <to <1.0 <<1.1..00 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
4t5 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 41h 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 29d Qtr 6/12/2018 <1.0 <1.0 <1.0 <1.0 59.2 2.51 3rd Otr 8/29/2018 <1.0 <1.0 <1.0 <1.0 68.1 2.56

Qtr 11/30/2018

4t i Qtr 3/16/2019 1 <1.0 <1.0 <1.0 <1.0 <1.0 <1.0 <1.0 <1.0 57.5 57.5
2.50
.---- "-1-1.:
29d Qtr 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
41 lilt QQ tt rr 12/14/2019 3/17/2020 <1.0 <1.0 <1.0 <1.0
<1.0
<1.0 <1.0 <1.0
6549..72 1.89
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 1st Qtr 3/17/2021 <1.0 <1.0
<1.0
<1.0 <1.0 <1.0
<1.0
<1.0 53.7 60.5
11..7940
2nd Qtr 6/15/2021 <1.0 <1.0 <1.0 <1.0 40.4 2.31
TW4-33 4th Qtr 11/14/2013 <1.0 126 <1.0 <1.0 47.2 1.82 1st Qtr 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 1st Qtr 3/12/2015 <1.0 <1.0 <2..00 <1.0 <1.0 44.2 44.2 2.22 1.91 112,44
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
129 <1.0 <1 0 44.5 1.92 103//2192,122001156 41 tsht QQ. it rr <21..00 2.13 122 <1.0 <1.0 46.2
2nd Qtr 8/8/2016 <1.0 96.1 <1.0 <1.0 49.7 2.06
3rd Qtr 8/4/2018 <1.0 121 <1.0 <1.0 48.5 2.32
4th Qtr 10/26/2016 1st Qtr 3/17/2017 <1.0 <1.0
109
90.7
<1.0
<1.0
<1.0
<1.0
52.4
49.0
2..3
161 2
2n4 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
10/11/2017
1st Qtr 3/15/2018
<1.0
<1.0
97.1
128
<1.0
<1.0
<1.0
<1.0
42.5 49.2 21..0994
2nd Otr 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
41h 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 2.00 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
4t8 Qtr 12/3/1189//22002190 1st Qtr 117 <1.0
<1.0
<1.0
<1.0
48.8
45.3
1.86
2.44 <21..00 933
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
41h Qtr 11/11/2020 <1.0 80.6 <1.0 <1.0 51.5 3.71
DWMRC split sample <10 68 <20 <20 54 0.12 H
1s1 Qtr 3118/2021 <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
Shaded indicates concentrations exceeding GWOS. 4 = Sample was analyzed beyond holdng times and may not be accureate oonceneation.
TABLE 1 (30 of 31)
Historic Summary Of Monitonng Well Analytical Results Up To The 2nd Qarter 2021
Chlorofoim Contamination investigation DUSA White Mesa Mill
TW4-34 Sampling Event Parameter (GWQS)
Carbon Tetrachloride
(5 pg/L)
Chlorotoim
(70 pg/L)
Chloromethane
(30 pg/L)
Methylene Chloride
15 pg/L)
Chloride
No GWQS (mg/L)
Nitrate, Nitrate + Nitrite
(10 mg/L)
4th Qtr 11/14/2013
1st Qtr 1/23/2014
2nd Qtr 5/22/2014
3rcl Qtr 8/13/2014
41 t
sht Q
CItt
r
r 103//2
191//22001145
2nd Qtr 6/11/2015
3rd Qtr 9/3/2015
4th Qtr 10/21/2015
1st Qtr 3/16/2016
2nd Qtr 5/25/2016
3rd Qtr 8/3/2016 4th Qtr 10//21082010162 1st Car 3 2nd Qtr 6/15/2017 3rd Qtr 8/2/2017 4th Qtr 10/10/2017 Duplicate TW4-65
<1 0
<1 0
<1 0
<1 0
<<11 00
<1 0
<1 0
<1 0
<1 0
<1 0
41 0
<1 0
<1 0
<1 0
<1 0
<1 0
<1 0
<1 0
<1 0
<1 0
<1 0
<1 0 <1 0 _:..11 0 0.
<1 0 <1 0 <1 0 <1 0
<1 0 <1 0 <1.0
<1 0
<1 0 <1 0 <1 0 <1 0
19 2 20 4 17 9 18 17 8 17 7
17 4
15 1
1_5_.8
17 3
18
17 2 _
15 7
19 8
18 5
20 4
19 1
19 5
23 8
18 5
17 9
20 1
17 8
21 4
20 1 20 9 19 0 18 7 19 3 17 8
18 b
19
1 64 1 93 1 69 1 10 1 16 1 21 0 868
0 458
0 368
0 925
0 605
0 726
0 612
0 674
0 727
0 733
0 774
0 784
0 737
0 877
0 736
5 889
00 <<11
<1 0
<1 0
<1 0 <1 0
<1 0
<1 0
<1 0
<1 0 <1 0 <1 0 1 0 :, 0
<1 0
<1 0
<1 0
<10 _ _ <1 0
<1 0 <1 0
<1 0
<1 0 <1 0 <1 0 <1 0
<1 0
<<11 00
<1 0
<1 0
<1 0
<1 0
<1 0
<1 0
<11 0 5 <
<1 0
<1 0 <1 0 _. <1 0 <1 0 <1 0
<1 0
, .<1,2
<1 0
<1 0 <1 0
<<10 1 0--
<1 0 <1 0
<1 0
<1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0

1st Q-tr - -3/14/2018

2nd Qtr 6/13/2018

3rd Qtr 8/29/2018

C)t 12/12/2018
<<10
1 0
<1 0
<1 0
<1 0 <1 0 <1 0 <<1 0 1 0 <1 0 <1 0 :1 0 1 0 <1 0
4111 rr
Q l

3/16/2019 2nd Qtr 6/13/2019 3rd Qtr 9/11/2019 4th Qtr 12/14/2019 1st Qtr 3/17/2020 2nd Qtr 6/10/2020 3rd Car 9/17/2020 41h Qtr.. 11/4/2020 1st Qtr 3/17/2.021 2nd Otr 6/16/2021
0 :::
0 994
0 934
1 07
1 090 1 240 0 978 1 04 1 09 1 08
<1 0 <1 0 <1 0
<1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 0 4;1 0 <1 0
TW4-35
3rd Qtr 8/27/2014
4th Qtr 10/28/2014
1st Qtr 3/11/2015 2nd Qtr 6/10/2015 3rd Qtr 9/3/2015 41h Qtr 10/28/2015 1st Qtr 3/16/2016 2nd Qtr 5/26/2016 3rd Qtr 8/3/2016 4 th Qttr 5 r .. 103//210/4g2 1sto 2nd Qtr 6/15/2017 3rd Qtr 8/2/2017
<1 0
<1 0
<1 0
<1 0 <1 0 <1 0 <1 0 41 0 <1 0 0 <
<1 0
<<1 1 53 <1 0 <1 0
<11 50 < <1 0 <1 0 12 :1. 0..
<1 0 <1 0 0 <110 <
<1 0 <1 0 <1 0 <1 0 <1 0
<1 0 <1 0 <1 0
<1 0 <1 0 <1 0 <1 0 <1 0
<1 0
<1 0
<1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0
<1 0 <1 0 <1 0 <1 0 <1 0
<1 0 <1 0
<1 0
<1 0 <1 0 <1 0 <1 0 <1 0
<1 0 <1 0 34
3344
0 2
0 351
0 436
0 452
0 304
00 452191
0 631 0 723 0 626 0 673 0 699 0 670 0 651 0 740 0 662 0 527 0 559 0 574 0 670 0 525 0 524
<1 0
<1 0 <1 0
<11 5 < 0 <1 0 <1 0 <1 0
9
1
35 2
35 9 33 4 35 4 35 4 34 8 37 1 116<il_0
<1 0 <1 0 1 0
<1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0
33 7 34 8 36 3 31 7 37 4 33 7 39 3 43 0 33 5 35 5 31 7
37 4
130//1104//22001179 4: QQ tt rr _ 1

2nd Qtr 6/13/2018

3rd Qtr 8/30/2018

r 12/12/2018
:10 <1 0 <1 0 41 0 4 th Qttr 1stQ 3/16/2019 2nd Qtr 6/13/2019
3rd Qtr 9/11/2019
41 Li ((It
rr .. _ .. 1 //1147//22002190
2nd Qtr 6/11/2020 3r1 Qtr 9/17/2020 4th Qtr 11/4/2020 l st Qtr 3/17/2021 2nd Qtr 6/16/2021
<1 0 <1 0 <1 0
<<11 06_ _ _
<1 0 <1 0 <1 0 <1 0 <1 0
<1 0 <1 0 <1 0 <1 0 <1 0 <1 0
<1 0 <1 0 <1 0 <1 0
34 5
34 0
32 2
30 4 —35-6 34 1
0 595
0 699
0 760
- - 1 :9116 1 01 TW4-36 3m1Qtr <1 0
< . 1 0 . . 10 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0
<1 0
0 <110 < <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0
<1 0 <11 0 < 0
<1 0
<1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0
5 <<110 <1 0 <1 0
V1_ 0 0
<1 0 <1 0 :1_00 ,
<1 0
<1 0
<1 0
<1 0
<1 0
<1 0 <1 0
65
_ 67 3
67 2
69 3
76 4
6647 52 72 3 69 4 73 8 72 60 2 71 3 69 6 62 9 73 8 64 3 76 4 65 8
<0 1 <0 1 4ilt r 10/23/201145 1 cltOtr w1v20 2nd Qtr 6/10/2015 3rd Qtr 9/3/2015 4th Qtr 10/21/2015
<1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0
<0 1 <0 1
<0 1
4<50 11 <0 1 <0 1 <0 1
<0 1 <0 1 <0 1 0 104 4-0 i <0 1 <0 1
_ 0 123 0 116 <0 1
<0 1
<0 1
<0 1
<0 1 <0 1 <0 1
1st ar 3/11/2016 2nd Qtr 5/26/2016 3rel Qtr 7/28/2016 4th Qtr 10/20/2016 Dyilsate TW4-70 1st Qtr 3/15/2017 2nd Qtr 6/15/2017 3rd Qtr 8/2/2017 4t5 Qtr 10/10/2017 1st Qtr 3/14/2018 2nd Qtr 6/12/2018 3rd Qtr 8/29/2018 41 t
shi (20 tor 132//112z.g1189
2nd Qtr 6/13/2019
3rd Qtr 9/11/2019
4th Qtr 12/14/2019
lsiQtr 3/17/2020
2nd Qtr 6/11/2020 3ig Qtr 9/17/2020 4th Qtr 11/4/2020 1st Qtr 3/17/2021 2nd Qtr 6/16/2021
<1 0 <1 0 <1 0 <1 0
<1 0 <1 0 <1 0 <1 0
<1 0 <1 0 <1 0 :1..00..
<1 0
41 0
<1 0
<1 0
<1 0
<1 0 <1 0 <1 0 <1 0
<1 0 <1 0 <1 0
<<1.1 00
<1 0
<1 0
<1 0
<1 0
<1 0 <1 0 <1 0 <1 0 <1 0
<1 0 <1 0 <1 0 :1 00
<1 0
<1 0
<1 0
<1 0
<1 0 <1 0 <1 0 <1 0 <1 0
65 71 5 69 6
73 7
69 1
67 0
66 0
0 <1 0 <1 0
64 5 68 7 <0 1 <0 1
Shaded indicates concentrahons exceeding GWOS
TABLE 1 (31 of 31) Historic Summary Of Monitoring Well Analytical Results Up To The 20d Qarter 2021
Chlorofonn Contamination Investigation
DUSA White Mesa Mill
TW4-37 (chloroform purniang well 8/9/15)
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 16A 19,100 137 1,04 374 32.4
41 tsht QQtt tr 10/19/2015 3/9/2016 12.5 15A 19 500 17.500
9A8
3A7
1.17
1.34 3392 9 3
346 28.4
2nd Qtr 5/23/2016 14.4 16 200 3A7 1.17 389 27.9
3rd Qtr 7/25/2016 16.7 16.3
15 900 <1.0 <1.0 294 33.4
4th Qtr 10/31/82/122001167 1st Qtr
1A400
18,000
<1.0
A57
<1M
1.34 1901- ..._ 2...§i 32.3 15.4
2nd Qtr 6/15/2017 162 15800 <10 <1A 281 31.2
310 Qtr 7/26/2017 15.1 15 000 <12 <1A 277 30.5
4.10..Pli. 19.0.112017 12.6
141g
247 <1.0 255 30.6 30.0 1st Qtr 3/12/2018 12A 1.14 <10 263
2nd Qtr 6/8/2018 1M6 14 400 <12 <1.0 275 28.6
3nd Qtr 8/22/2018 12.1 14,100 6.2 <1.0 387 25.3
4th Qtr 11/28/2018 11.3 15 200 198 <1.0 264 273
1st Qtr 3/8/2019 13.8 13.300 1.24 <1.0 209 30.1
2nd Qtr 6/5/2019 14.6 16200 <12 <1.0 250 31.2
3rd Qtr 9/4/2019 10.7 11,900 1.9 <1.0 228 25.8
12/10/2019 8.81 13 100 3.12 <1.0 220 25.5 _ 41 tsht QQttrr 2)19/2020 8.53 12,000 12.3 <12 236 28.3
2nd Qtr 5/27/2020 11.8 11,700 144 <1.00 321 28.3
3rd Qtr 9/4/2020 9A2 13A00 <10 <1.0 273 29.5
10 6.52 10A00 29A <1.0 254 28.7 41 tsht QQtt tr v/2283//2200220
1 .0 <1A <1.0 242 26.9 9A80
25d Qtr 6/9/2021 8 46 13,000 128 <1A0 176 26.6
TW4-38
4th Car 11/10/2016 <1.0 <1.0 <1.0 <1.0 40 11.2
1st Qtr 3/15/2017 <1A <1 A <1.0 <10 35.7 106
2nd Qtr 6/15/2017 <1.0 <1.0 <1.0 <1A 36.2 108
3rd Qtr 8/2/2017 01A <1.0 <1.0 <1.0 36.9 10.1 1M3 419 Qtr 10/10/2017
1st Qtr 3/14/2018 <10 <1A
1 0 < 0 <1: <10
<1.0
<10
<1.0
31.3 36.5 934
2nd Qtr 6/13/2018 <1.0 <1.0 <12 <1.0 33.1 9A8
3n1 Qtr 8/30/2018 <1.0 <1.0 <1.0 <1.0 39.2 777
41 ts th QQtt rt 132//1162//22001185 << 11 : 00 <1A
<1 M
<1 2
<1A
<1.0 <1. 0 O3 A :.:1g
2nd Qtr 6/13/2019 <12 <10 <10 <12 33.7 8.53
Duplicate 1W4-70 <1C <1C <10 <1.0 353 9.52
3r4 Qtr 9/11/2019 <1A <1.0 <1.0 <1.0 31A 7.61
12/14/2019 < 1M 01A <1A <1A 3 33 .6 4
7.51 4ltsth QQttr
t

3/17/2020 <10 <10 <10 <10 8.11
2nd Qtr 6/11/2020 <1A <1.0 <IA <1A 34A 9.00
3rd Qtr 9/18/2020 <1A <1.0 <10 <1A 34 7 7.35
4th Qtr 11/4/2020 <1.0 <1.0 <1.0 <1.0 35 l _7.:1.2 l st 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 <12 <10 37.7 9A9
Duplicate TW4-70 <1.0 <1.0 <1C <1.0 35.7 905
11N4-39/evzimeri, purnpim well (11/2016) <1.0 2.800 <10 <12 20.7 4th Qtr 11/311/22001167
1st Qtr m/ 815 6,460 <1A 135 130 6.44
2nd Qtr 6/15/2017 8.2 5560 <10 1.31 120 6.25
3r01 Qtr 7/26/2017 14.4 10,000 <1.0 1.5 132 7.74
4th Qtr 10/10/2017 <IA 552 <1.0 <IC 7 35 1i 8 2.65
1st Qtr 3/12/2018 3 .1 Z870 <1.0 <1A 3.33
2n4 Qtr 6/8/2018 7.94 7,160 <1.0 <10 107 4.84
3rd Qtr 8/22/2018 12.5 8,180 233 <1.0 110 625
4th Qtr 11/28/2018 628 @JP) 2.33 <1.0 .....9 1st Qtr 3/8/2019 1.2 885 <1.0 <1.0 ai 208
2nd Qtr 6/5/2019 11.6 8 A40 <1.0 <1.0 114 8A5
3rd Qtr 9/4/2019 5.71 4.240 <1.0 <1.0 48.2 1.75
41 tsth QQttrr 12/10/2019 2/19/2020 <1.0
1.14 1A50 <1.0
<1A
<1.0
<1.0 7764...75 025 0.792 812
2nd Qtr 5/27/2020 7.56 5A70 <1A <12 88.5 5M1
3rd Qtr 9/18/2020 8.18 5 960 <1M <1.0 2 A9
4th Qtr 10/28/2020 <IA 648 1.19 <1M 63.21 83.2 7 A3
1st Qtr 2/23/2021 <12 2 970 <1.0 <1M 53 0 2.12
2nd Qtr 6/9/2021 7.56 2,490 <1.0 <1M 123 120
TW4-401.n.rolorrii puns% well 5.0191
1st Qtr 3/21/2018 <1C 248 <1.0 <1.0 35.7 308
2n4 Qtr 6/13/2018 <1C 131 <1.0 <1A 316 3.33
3rd Qtr 9/5/2018 <1.0 116 <1.0 <1.0 37.6 3.22
455 Qtr 12/12/2018 <1,0 118 <1.0 <1.0 29 9 3.54
0gEr.E11. TW4-75 119 <1.0 <1C 32.3 3.18
(2)1st Qtr 3/20/2019 <10 111 <1.0 <1.0 30.9 3.18
Ind Qtr 6/5/2019 <1C 263 <1M <1.0 35A 3 55
3r0 Qtr 9/4/2019 <10 380 <1.0 <1.0 35A 3.39
4th Qtr 12/10/2019 <1.0 314 <1.0 <1.0 367 289
15t Qtr 2/19/2020 <1A 364 <1A <1A 38A 2.98
2nd Qtr 5/27/2020 <1C 367 <1A <10 36.5 2.91
3rd Qtr 9/4/2020 <1A 333 <1.0 <1.0 34 2 2.88
4th Qtr 10/28/2020 <1A 24634 <1.0 <1A 34A 2.58
1st Qtr 2/23/2021 <1A 6 A51 <1A 36.0 2 A3
2nd Qtr 6/9/2021 <1.0 343 <1.0 <1A 27.5 3.77
TW4-41(claorotorm pumping well 5/2018)
2nd Qtr 5/8/2018 <1.0 1,400 <1A <1.0 42.8 6.54
3rd Qtr 8/22/2018 <1.0 1,390 <1A <1.0 45.5 6.13
4th Qtr 11/28/2018 <1.0 1320 <12 <12 41.4 _..... .,:,,!.1
1st Qtr 3/8/2019 <1.0 1 . 220 . <1 0 <1M 39.1
2n4 Qtr 6/5/2019 <12 1,320 <1A <1A 38.1 6 AO
310 Qtr 9/4/2019 <1A 1,190 <1.0 <1.0 39A 6.22
<10 1A1,0 <1.0 <1.0 42.1 41 il
t
12/10/2019 r
r
QOtt
2/19/2020 <10 1,200 <1.0 <1.0 444 6.12
2nd Qtr 5/27/2020 <1.0 1 220 <1.0 <1.0 41.7 678
3rd Qtr 9/4/2020 <1.0 1,110 <1.0 <1.0 40.2 669
<1.0 1,020 <1.0 <1.0 39.7 6.25 4th Qtr 19 8/2020 1st Qtr 2//223/2021 <1.0 1,170 <12 <1.0 406 6.41
2nd Qtr 6/9/2021 <1.0 1 130 <1.0 <1.0 39.5 7A5
TW4-42
2nd Qtr 6/19/2019 <1.0 <1.0 <1.0 <1.0 23.3 2 57
3rel Qtr 9/11/2019 <IA <1A <1.0 <1.0 20A 2.75
4th Qtr 12/10/2019 <IA <10 <1.0 <1M 22.6 282
kipiicato 1W4-75 <1.0 <1.0 <1.0 <1.0 22.6 2. 9 2.858 1st Qtr 2/17/2020 <10 <1A <1.0 <1A 232-
2nd Qtr 6/10/2020 <1C <10 <1.0 <1M 23.1 3.23
3rd Qtr 9/17/2020 <1.0 <1.0 <1.0 <1A 23.5 3 A5
41h Qtr 11/4/2020 <1.0 <1.0 <1.0 <1A 224 2.77
1st Qtr 3/17/2021 <1.0 <1.0 <1.0 <1.0 24.2 A15
2n4 Qtr 6/15/2021 <1.0 <1.0 <1.0 <1.0 24A 3A7
Shaded indicates concentrators exceedMg GWC/S. (1) Voce were resainpled because laboratory missed holdind time. (2) Chloroform Eumara well stated in M!ki 2019.
Table 2
Summary of EFR QA/QC Samples
2nd Quarter 2021
Duplicate Samples of Wells
Parameter GWQS Duplicate of TW4-3 Duplicate of TW4-38 Duplicate of MW-32 - TW4-3 TW4-65 RPD TW4-38 TW4-70 RPD MW-32 TW4-75 RPD
Chloride none 27.0 23.9 12.2 37.7 35.7 5.4 35.8 34.3 4.3 Nitrate + Nitrite (as N) 10 mq/L 8.04 7.89 1.9 9.59 9.05 5.8 <1.0 <1.0 nc Chloroform 70 pq/L <1.0 <1.0 nc <1.0 <1.0 nc <1.0 <1.0 nc Carbon tetrachloride 5 pq/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 ca cu ate
Tabel 3
Chloroform Mass Removal Calculations for the 2nd Qurater 2021
EFR White Mesa Mill, Bland, Utah
Well ID MW4 MW-26 TW4-1 TW4-2 1W4-4 TW4-11 TW4-19 TW4-21 TW4-22 TW4-24 1W4-25 TW4-37 TW4-39 TW4-40 TW4-41
(t)Chloroform (ug/L) 1,320 998 957 1,160 1,240 3,320 775 1,130 4,520 41.2 0.0 13,000 2,490 343 1,130 Chloroform (g/L) 1.32E-03 9.98E-04 9.57E-04 1.16E-03 1.24E-03 3.32E-03 7.75E-04 1.13E-03 4.52E-03 4.12E-05 0.00E+00 1.30E-02 2.49E-03 3.43E-04 1.13E-03
Chloroform (lbs/L) 2.92E-06 2.21E-06 2.11E-06 2.56E-06 2.74E-06 7.34E-06 1.71E-06 2.50E-06 9.99E-06 9.10E-08 0.00E+00 2.87E-05 5.50E-06 7.58E-07 2.50E-06 Chloroform (lbs/gal) 1.10E-05 8.35E-06 8.00E-06 9.70E-06 1.04E-05 2.78E-05 6.48E-06 9.45E-06 3.78E-05 3.45E-07 0.00E+00 1.09E-04 2.08E-05 2.87E-06 9.45E-06 Total gallons pumped 93252.4 29124.1 8764.1 11975.9 13425.7 1694.5 151242.8 97157.6 22893.3 54377.9 82692.8 58564.2 32865.2 66866.4 13168.7
lbs of chloroform removed 1.0 0.2 0.07 0.12 0.1 0.05 1.0 0.9 0.9 0.019 0.00 6.4 0.7 0.19 0.1 Gallons of chloroform removed 0.08 0.02 0.01 0.01 0.01 0.00 0.08 0.07 0.07 0.002 0.00 0.52 0.06 0.02 0.01
total lbs of chloroform removed 11.8
total gallons of chloroform removed 1.0
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 = Abanclonded Well