DRC-2021-000699 - 0901a06880ddbd04

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State of Utah
SPENCER J. COX
Governor
DEIDRE HENDERSON
Lieutenant Governor
Department of
Environmental Quality
Kimberly D. Shelley Interim Executive Director
DIVISION OF WASTE MANAGEMENT
AND RADIATION CONTROL
Ty L. Howard
Director
MEMORANDUM
DBC-202(-000”
TO:
FROM:
DATE:
SUBJECT:
Phil Goble
Dean Henderson
January 12, 2021
Review of the November 16, 2020 3rd Quarter, 2020 Chloroform Monitoring Report for
the Chloroform Contamination Investigation, Energy Fuels Resources (USA) Inc.
("EFRI") White Mesa Uranium Mill ("Mill"), near Blanding, Utah.
The Utah Division of Waste Management and Radiation Control ("Division") has reviewed the
November 16, 2020 3rd Quarter 2020 Chloroform Monitoring Report ("Report") for the Chloroform
Contamination Investigation. For the review of this report the following regulatory enforcement
documents were used:
• EFR issued Ground Water Quality Discharge Permit No. UGW370004 ("Permit"). Permit
version that was signed on March 19, 2019.
• The EFR Quality Assurance Plan ("QAP") September 10, 2019 (Revision. 7.6)
• The EFR Groundwater Corrective Action Plan ("GCAP") September 14, 2015 (Revision 0)
• Utah Stipulation and Consent Order Docket Number UGW20-01, September 16, 2015.
REVIEW
GCAP Part III.0 requires the 3rd Quarter Report to be submitted to the Division on or before December
1, of each year. The Report was received by the Division on November 19, 2020 (date of Report
November 16, 2020) which meets the GCAP requirement.
Monitor Well Sampling
The following 42 monitor wells were sampled as required in the GCAP (see Table 1 below):
MW-4 TW4-3
MW-26 TW4-4
DRC-20
TW4-8 TW4-13 TW4-21 TW4-26 TW4-31 TW4-36 TW4-41
TW4-9 TW4-14 TW4-22 TW4-27 TW4-32 TW4-37 TW4-42
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
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MW-32 TW4-5 TW4-10 TW4-16 TW4-23 TW4-28 TW4-33 TW4-38
TW4-1 TW4-6 TW4-11 TW4-18 TW4-24 TW4-29 TW4-34 TW4-39
TW4-2 TW4-7 TW4-12 TW4-19 TW4-25 TW4-30 TW4-35 TW4-40
The water samples for the above wells were analyzed for the following constituents as required in the
QAP:
Chloroform Chloride
Chloromethane Methylene chloride
Carbon tetrachloride Nitrate + Nitrite as Nitrogen.
The analytical methods used is consistent with the requirements of the GCAP. For a summary of the 3rd
Quarter, 2020 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, TW4-20, TW4-21, TW4-22, TW4-24,
TW4-25, TW4-37, TW4-39, TW4-40, TW4-41, TW4-42, and TWN-2.
The monitoring wells were purged using the three approved QAP well purging strategies and meet QAP
requirements for each strategy:
1. Purging two casing volumes with stable field parameters for specific conductivity,
turbidity, pH, redox potential, and water temperature (within 10% RPD):
Wells: MW-32, TW4-5, TW4-8, TW4-9, TW4-16, TW4-18, TW4-23, TW4-32, and TW4-38.
2. Purging a well to dryness and stability of field parameters for pH, specific conductivity, and •
water temperature only after recovery:
Wells: TW4-3, TW4-6, TW4-7, TW4-10, TW4-12, TW4-13, TW4-14, TW4-26, TW4-27,
TW4-28, TW4-29, TW4-30, TW4-31, TW4-33, TW4-34, TW4-35, TW4-36, and TW4-42.
3. The pumping wells are continuously pumped on a set schedule and are sufficiently purged to
collect a sample
Pumping Wells: MW-4, MW-26, TW4-1, TW4-2, TW4-4, TW4-11, TW4-19,
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TW4-21, TW4-22, TW4-24, TW4-25, TW4-37, TW4-39, TW4-40, and TW4-41.
Holding Times
The water samples method holding times for each parameter for samples collected at each monitor well
were received and analyzed within the required holding times stated in the QAP.
Receipt Temperature
Water samples were received within the required QAP temperature limit of 6° C.
Analytical Methods
The analytical methods reported to be use by the laboratory to analyze Chloroform, Chloride,
Chloromethane, Methylene chloride, Carbon tetrachloride, and Nitrate + Nitrite as Nitrogen are
incompliance with analytical methods required in the Chloroform QAP.
Detection Limits
Analyses were measured and reported to the required reporting limits. However, several sets of sample
results had the reporting limit raised for at least one analyte due to matrix interference and/or sample
dilution. In all cases the reported value for the analyte was higher than the increased detection limit.
EFR Duplicate Sample Comparison
Three duplicate samples were collected. Monitor well TW4-42 and its duplicate sample TW4-65, and
TW4-8 and its duplicate sample TW4-70; and MW-32 and its duplicate sample TW4-75. All analytical
results for the three sample/duplicate pairs were within the 20% relative percent difference (RPD)
acceptance limits (see Table 2 below).
Mass Removed and Plume Residual Mass
Chloroform removal was first estimated from the 1st Quarter, 2007. Since that estimation the mass
removed by each pumping well for each quarter has been calculated. Estimated reported mass removed
during the 3rd Quarter 2020 is 13.4 lbs. (see Table 3 below) which is less than the estimated 25.2 lbs.
removed in the 2nd Quarter 2020. The smaller mass removal is a primarily due to decrease in
concentrations in TW4-19 and the failure of TW4-20. TW4-20 did pump for a portion of the 3rd quarter
but the well failed before the 3rd quarter sampling event. Therefore, the amount of chloroform removed
could not be added to the total chloroform mass removed.
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 909 lbs. in the 3rd Quarter, 2020. This
approximately 147 lbs. smaller than the 2nd Quarter 2020 estimated mass of 1,056 lbs.
As per Part III.B.2 of the GCAP, the electronic files were used in 3rd Quarter, 2020 to calculate the
mass estimates. The following files were used to calculate the estimated chloroform mass within the
chloroform plume:
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• Excel spreadsheet that included: well name; well location (easting and northing); Laboratory
reported concentration in vtg/1 in the 3rd Quarter, 2020 and corresponding log equivalent values.
• Surfer® griding parameters: kriging parameters: SURFERTM default parameters (point kriging,
linear variogram, slope = 1, no anisotropy [anisotropy = 1], no search constraints; min x, max x
(UTME[m]): 631900, 633043; min y, max y (UTME[m]): 4154240, 4155550.64; grid spacing in
x, y (m): 15.24, 15.24
• 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 EFR 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 70 µg/L boundary, 2) graphs showing
Chloroform concentration trends in each well through time and, 3)
Analytical results for each well summarized in a data table that includes
Historic analytical results for each well.
-Calculate chloroform mass removed by pumping wells. Calculations
would include: 1) total historic chloroform mass removed, 2) total historic
chloroform mass removed for each pumping well, 3) total chloroform
mass removed for the quarter and, 4) total chloroform mass removed from
each pumping well for the quarter, 5) estimated residual mass of chloroform within the
plume.
d) Conclusions and Recommendations
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e) Electronic copy of all laboratory results for Chloroform Investigation monitoring conducted
during the quarter.
0 Copies of DUSA field records, laboratory reports and chain of custody forms.
Evaluation of the Chloroform Contaminate Plume and Its Associated Contaminants
Bounding Chloroform Plume
Groundwater monitoring data up to the 3rd Quarter, 2020 monitoring event appeared to show that the
chloroform contaminate plume ("Plume") and associated contaminants (carbon tetrachloride,
chloromethane, and methylene chloride) is bound by up gradient, cross gradient, and down gradient
compliance monitoring wells that have a chloroform concentration of <70 µg/L ("GWQS = 70 µg/L).
Performance Monitor Wells ("PM") [Wells Exceeding Chloroform Concentrations GWQS of 70µg/L1
Six (6) PM wells still exceed 70 µg/L: TW4-7, TW4-10, TW4-16, TW4-26, TW4-29, and TW4-33.
Compliance Monitor Wells ("CM") [Wells with Chloroform Concentrations between < 1 and 70µg/L1
Eight (8) CM wells range with detectable chloroform concentration but still below 70p,g/L: TW4-5,
TW4-6, TW4-8, TW4-9, TW4-14, TW4-18, TW4-27, and TW4-30.
CM Wells Below the Laboratory Chloroform Detection Limit (<1.0 µg/L)
Thirteen 13 CM wells were below the laboratory detection limit for chloroform (<1.0 µg/L): MW-32,
TW4-3, TW4-12, TW4-13, TW4-23, TW4-28, TW4-31, TW4-32, TW4-34, TW4-35, TW4-36, TW4-
38, and TW4-42.
Pumping Wells
On July 28, 2020 the pump in TW4-20 failed and it was determined that the pump had to be replaced.
During pump removal the Mill staff found that due to iron fouling the pump was wedged in the well and
could not be removed. On July 31, 2021 a drilling contractor attempted to remove the pump with the use
of high pressure air and failed. On August 4, 2020 a drilling contractor attempted to drill out the pump
with different sized drill bits. During this process both PVC casing and silica sand were found in the
cuttings and drill refusal at approximately 55 feet the depth of the top of the screen interval. It was
determined that TW4-20 had collapsed and is unsalable. On September 28, 2020, the Division sent
EFRI a confirmatory action letter ("CAL") approving the abandonment of TW4-20 with no replacement
at this time. The CAL included the requirement for additional assessment of the chloroform pumping
system in the next CACME due March 2022 to determine if a replacement pumping well is necessary.
TW4-20 was abandoned on October 2, 2020 in accordance with the Utah Division of Water Rights
regulations, using a Utah licensed drilling contractor.
There are 17 pumping wells in full operation in the 3rd Quarter, 2020, 14 pumping wells MW-4, MW-
26, TW4-1, TW4-2, TW4-4, TW4-11, TW4-19, TW4-21 TW4-22, TW4-37, TW4-39, TW4-40, and
TW4-41 exceed chloroform concentrations of 70 µg/L. Pumping well TW4-24 had detectable
Page 6
chloroform concentration but was still below 70 pg/L. Pumping well TW4-25 had a non-detectable
(<1.0 lig/L) chloroform concentration (see table 1 below).
Nitrate, Nitrate + Nitrite ("nitrate") Concentrations
Pumping wells TW4-22 (64.8 mg/L) and TW4-24 (39.1 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 (10.5 mg/1) continue to exceed the nitrate GWQS of 10 mg/1. 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. 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 (25.2 mg/L) continue to exceed the nitrate GWQS of 10 mg/l. The source of nitrate may
be from the chloroform source plume. Wells TW4-29, TW4-30, and TW4-31 located approximately
200 feet down and/or cross gradient of TW4-27 have nitrate concentrations in the 3rd quarter 2020
below the GWQS of 2.90 mg/L, 3.49 mg/L, and 0.51 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 3rd Quarter, 2020
Chloroform Monitoring Report for the chloroform contamination investigation.
Page 7
References
EFR Quality Assurance Plan ("QAP") Jule 23, 2018 (Revision. 7.4)
EFR issued Ground Water Quality Discharge Permit No. UGW370004. Permit version that was
signed on March 19, 2019.
EFR, 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)
EFR, White Mesa Uranium Mill Chloroform Monitoring Report 3rd (July through September)
Quarter 2020, November 16, 2020. (DRC-2020-018798)
EFR, 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.
Utah Department of Environmental Quality Division of Waste Management and Radiation
Control, 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. Chloroform Contamination Investigation. Abandonment and Hydrogeologic
Investigation for Pumping Well TW4-20. Confirmatory Action Letter. September 28, 2020.
(DRC-2020-018798)
Page 8
Tables 1 through 3
TABLE 1 (1 of 31)
Historic Summary Of Monitoring Well Analytical Results Up To The 3rd Qarter 2020
Chloroform Contamination Investigation DUSA White Mesa Mill
MW-4 (chloroform pumping well started pumping 3/9/03)
Sampling Event
Parameter
(GWQS) Carbon Tetrachloride (6 pg/L) Chloroform (70 pg/L) Chloromethane
(30 pg/L)
Methylene Chloride (6 pg/L) Chloride
No GWQS (mg/L)
Nitrate, Nitrate + Nitrite
(10 mg/L)
1st Qtr 3/16/2005 NA 2,900 NA NA NA 6.3
2nd Qtr 5/25/2005 NA 3,170 NA NA NA 7.1 3rd Qtr 8/31/2005 <10 3,500 <10 <10 NA 7.0
4th Qtr 12/7/2005 <50 3,000 <50 <50 53 7.0
1st Qtr 3/9/2006 <50 3,100 <50 <50 49 6.0
2nd Qtr 6/14/2006 <50 3,000 <50 <50 49 6.0 3rd Qtr 7/20/2006 <50 2,820 <50 <50 48 1.2
4th Qtr 11/8/2006 2.1 2,830 1.4 <1.0 50 6.4
1st Qtr 2/28/2007 1.6 2,300 <1.0 4/1.0 47 6.3
2nd Qtr 6/27/2007 1.8 2,000 <1 0 <1.0 45 7.0
3rd Qtr 8/15/2007 1.9 2,600 <1.0 <1.0 47 6.2
4th Qtr 10/10/2007 1.7 .2„300 <1.0 <1.0 45 6.2 1st Qtr 3/28/2008 1.7 .2,400 <1.0 4/1.0 42 5.8 2nd Qtr 6/25/2008 1.8 2,500 <1.0 <1.0 42 6.1 3rd Qtr 9/10/2008 1.8 1,800 <1.0 <1.0 35 6.4 4th Qtr 10/15/2008 1.7 1,100 <1.0 <1.0 1st Qtr 3/4/2009 1.5 2,300 <1.0 <1.0 37 5.7 2nd Qtr 6/23/2009 1.3 1,800 <1.0 4/1.0 34 5.2
3rd Qtr 9/14/2009 1.4 2,000 <1.0 <1.0 43 5.3
4th Qtr 12/14/2009 1,800 _ <1.0 <1.0
1st Qtr 2/17/2010 1.2 1,600 4/1.0 <1.0 .45 4.6
2nd Qtr 6/14/2010 1.2 2,100 <1.0 <1.0 41 5.1
3rd Qtr 8/6/2010 1.5 1,900 <1.0 <1.0 38 4.8
41h Qtr 10/15/2010 1.4 15,00 4/1.0 <1.0 41 4.9
1st Qtr 2/23/2011 1.5 1,700 <1.0 <1.0 40 4.6
2nd Qtr 6/1/2011 1.4 1,700 <1.0 <1.0 35 4.9
3rd Qtr 8/17/2011 1.1 1,700 <1.0 <1.0 41 4.9
41h Qtr 11/16/2011 1.3 1 600 <1.0 <1.0 40 ....8,,1 1st OfiTY 1/23/2012 1 1,500 <1.0 <1.0 41.0 4.8 -2nd Qtr 6/6/2012 1.2 1,400 <1.0 <1.0 39.0 4.6
3rd Qtr 9/4/2012 1.5 1,500 <1.0 <1.0 41.0 5.0
4th Qtr 10/4/2012 1 1 300 <1 0 <1.0 41.0 .4.3 ist Qtr 2/11/2013 1.48 1,870 <1.0 <1.0 37.8 4.78
2nd Qtr 6/5/2013 1.31 1,490 <1.0 <1.0 44.0 4.22
3rd Qtr 9/3/2013 1.13 1,520 <1.0 <1.0 41.4 4.89 41h Qtr 10/29/2013 5.58 .:12.110 <1.0 <1.0 40.1 ........................ 5...0. 1st Qtr 1/27/2014 4.15 1,390 <1.0 <1.0 38.5 4.'7
2nd Qtr 5/19/2014 5.21 1,390 <1.0 <1.0 39.9 4.08
3rd Qtr 8/11/2014 7.6 1,490 <1.0 <1.0 41.0 3.7
4th Qtr 10/21/2014 <1.0 1,440 <1.0 <1.0 41.5 5.07 -1 st Qtr (2) 3/9/2015 1.26 1,400 <1.0 <1.0 40.7 5.78
2nd Qtr 6/8/2015 <1.0 1,300 <1.0 <1.0 43.1 2.53
3rd Qtr 8/31/2015 <1.0 1,200 1.42 <1.0 44.3 4.79
4th Qtr 10/19/2015 <1.0 .1,300 <1.0 <1.0 40.8 4.43
1st Qtr 3/9/2016 <1.0 1,340 <1.0 <1.0 42.2 5.15
2nd QV 5/23/2016 1.44 1,580 <1.0 <1.0 43.7 4.54
3rd Qtr 7/25/2016 <1.0 1,430 <1.0 <1.0 42.5 4.95
41h Qtr 10/12/2016 1.24 1 470 <1 0 <1.0 44.8 4,88 l st Qtr 3/8/2017 1.22 1,450 <1.0 <1.0 43.3 .4.96
2nd Qtr 6/13/2017 1.15 1,430 <1.0 <1.0 44.0 4.88
3rd Qtr 7/26/2017 1.15 1,400 <1.0 <1.0 43.8 4.59
4th Qtr 10/11/2017 <1.0 1,320 <1 0 <1.0 43.8 5.25
DWMRC..splitsumple <19 1 400 <30 70 J 43.0
1st Qtr 3/12/2018 1.07 1,320 <1.0 <1.0 46.2 4.47
2nd Qtr 6/8/2018 <1.0 1,240 <1.0 <1.0 43.5 4.64
3rd Qtr 8/22/2018 <1.0 1,300 <1.0 <1.0 48.5 4.55
4th Qtr 11/28/2018 <1.0 1 330 <1.0 <1.0 43.1 4.44 ........... 1st Qtr 3/8/2019 <1.0 1,190 <1.0 <1.0 41.5 5.08
2nd Qtr 6/5/2019 <1.0 1,300 <1.0 <1.0 40.6 5.16
3rd Qtr 9/4/2019 <1.0 1,180 <1.0 <1.0 41.9 4.69
4th Qtr 12/10/2019 <1 0 ...._1,37o ....... _......_ <1.0 <1.0 45.5 4.34
1st Qtr 2/19/2020 <1.0 1,230 <1.0 <1.0 48.1 6.22
2nd Qtr 5/27/2020 <1.0 1,250 <1.0 <1.0 40.7 5.04
3rd Qtr 9/4/2020 <1.0 1,240 <1.0 <1.0 43.8 4.93 MW-4AVW4-At.
1st Qtr 3/16/3005 NA 3,700 NA NA NA 7.1
2nd Qtr 5/25/2005 NA 3,740 NA NA NA 7.8 3rd Qtr 8/31/2005 <10 3,800 <10 <10 NA 6.9
4th Qtr 12f7/2005 <50 3,000 ....... <50 <50 55 . 6,7
1st Qtr 3/9/2006 <50 3,700 <50 <50 53 5.8
2nd Qtr 6/14/2006 <50 3,300 <50 <50 54 7.3
3rd Qtr 7/20/2006 <50 3,190 <50 <50 54 1.2
4th Qtr 11/8/2006 2.4 3 370 <1.0 4/1.0 54 ......7.1. 1st Qtr 2/28/2007 1.9 3,500 <1.0 Well abandonded <1.0 60 7
(1) As of March 2012 both north and south wild life ponds no Mngef receiving watcr.
(2) chloroform pumping wells TW4-1, TW4-2, and TW4-11 started in 1/14115
NA = not analyzed Shaded indicates concentrations exceeding GWQS. Bold and italics indicates the MDL exceeded the GWQS. J = Approximated value
TABLE 1 (2 of 31) Historic Summary Of Monitoring Well Analytical Results Up To The 3rd Qarter 2020
Chloroform Contamination Investigation
DUSA White Mesa Mill
MW-26 (former 1W4-15) Citionaform pumping well started E18/03
Sampling Event
Parameter
(GWQS)
Carbon Tetrachloride
(5 pg/L)
Chloroform
(70 pg/L)
Chloromethane
(30 pg/L)
Methylene Chloride
(5 pg/L)
Chloride
No GWQS (mg/L)
Nitrate, Nitrate + Nitrite (10 mg/L)
1st Qtr 3/16/2005 NA 310 NA NA NA 0.3
2nd Qtr 5/25/2005 NA 442 NA NA NA 0-2 3rd Qtr 8/31/2005 105.0 960 5.4 <5.0 NA 0.2 4th Qtr 12/7/2005 <50 1,000 <50 <50 55 0.3 .................. 1st Qtr 3/9/2006 <50 1,100 <50 <50 52 0.2
2nd Qtr 6/14/2006 <50 830 <50 <50 52 0.2
3rd Qtr 7/20/2006 <50 2,170 <50 <50 65 1.4
4th Qtr 11/8/2006 <1.0 282 <1.0 2.6 54 .9.,
1st Qtr 2/28/2007 <1.0 570 <1.0 5.5 56 0.6
2nd Qtr 6/27/2007 <1.0 300 01.0 13 49 0.4
3rd Qtr 8/15/2007 <1.0 1,400 <1.0 36 57
4th Qtr 10/10/2007 <1.0 2 000 <1.0 14 57 0.6 ........ 1st Qtr 3/28/2008 <1.0 930 101.0 40 49 6.1
2nd Qtr 6/25/2008 101.0 1,300 <1.0 53 57 0.6
3rd Qtr 9/10/2008 <1.0 630 <1.0 24 44 0.2
4th Qtr 10/15/2008 NA NA NA NA 64 0.1
11/18/2008 <2.0 1,700 102.0 100 NA NA
1st Qtr 3/4/2009 <1.0 950 <1.0 51 49 0.4
2nd Qtr 6/23/2009 <1.0 410 <1.0 12 48 0.2
3rd Qtr 9/14/2009 <1.0 850 <1.0 30 46 0.1
4th Qtr 12/14/2009 <1.0 1,100 <1.0 40 60 2.3
1st Qtr 2/17/2010 <1.0 730 <1.0 19 57 0.2
2nd Qtr 6/14/2010 1.2 1,600 <1.0 <1.0 40 6.8
3rd Qtr 8/16/2010 <1.0 2,200 <1.0 21 49 0.6
4th Qtr 10/15/2010 <1.0 970 <1.0 6.5 65 ........ 0.7
1st Qtr 2/23/2011 <1.0 450 <1.0 3.6 57 0.
2nd Qtr 5/31/2011 <1.0 1,800 <1.0 1 -3 88 0.4
3rd Qtr 8/17/2011 <1.0 720 <1.0 7.2 58 0.9
4th Qtr 11/16/2011 NA NA NA NA 69 2.0
(11 12/5/2011 <1.0 1,800 <1.0 2.9 NA NA
1st Qt1(2) 2/27/2012 <1.0 2400 <1.0 16 98 1.7
2nd Qtr 6/6/2012 <1.0 3,000 <1.0 21 73 2.6
3rd Qtr 9/4/2012 <1 3,100 <1 31 73 2.6
4th Qtr 10/4/2012 <1 1 200 <1 4 68
-
1.8
1st Qtr 2/11/2013 <1 2,120 <1 9.34 81.9 2..27
2nd Qtr 6/5/2013 <1.0 4,030 101.0 52.4 77.9 2.11
3rd Qtr 9/3/2013 <1.0 2,940 <1.0 33.2 60.5 1.18
4th Qtr 10/29/2013 <1.0 1,410 <1 4.03 72.3 1.38
1st Qtr 1/27/2014 <1.0 1,400 <1.0 13.8 59.4 0.55
2nd Qtr 5/19/2014 <1.0 1,960 <1.0 15.4 53.4 0.93
3rd Qtr 8/11/2014 <1.0 2,120 8.7 26 59 0.7
4th Qtr 10/21/2014 <1.0 , .2090 <1.0 23.2 60.1 0.93
1st Qtr 3/9/2015 <1.0 1,980 <1.0 27.4 56.5 0.73 2nd Qtr (3) 6/8/2015 <1.0 1,980 <1.0 11.2 62 0.42
'3rd Qtr 8/31/2015 <1.0 2,350 4.05 11.6 69.6 0.66
4th Qtr 10/19/2015 <1.0 2 680 1 32 8 28 62.6 0 991
1st Qtr 3/9/2016 <1.0 2,650 <1.0 4.66 68.3 1.45
2nd Qtr 5/23/2016 <1.0 2,220 <1.0 4.57 66.2 1.12
3rd Qtr 7/25/2016 <1.0 3,190 <1.0 7.81 66.4 1.57 4t6 Qtr (4) 10/12/2016 <1.0 2,510 <1.0 4.31 66.2 1.18
1st Qtr 3/8/2017 <1.0 1,290 <1.0 7.65 58.4 0.766
2nd Qtr 6/13/2017 <1.0 2,450 <1.0 7.59 64.3 0.922
3rd Qtr 7/26/2017 <1.0 1,230 <1.0 5.26 61.4 1.56
4th Otr 10/11/2017 <1.0 ..2,570 <1.0 7.83 .......62.2 1.18
1st Qtr 3/12/2018 <1.0 1,210 <1.0 2.14 60.3 1.57
2nd Qtr 6/8/2018 <1.0 1,870 <1.0 9.19 58.7 0.901
3rd Qtr 8/22/2018 <1.0 1,680 <1.0 <1.0 91.4 2.80
4th Qtr 11/28/2018 <1.0 .1460 <1.0 <1.0 85.5 1.96
1st Qtr 3/8/2019 <1.0 1,110 <1.0 2.2 69.9 1.85
2nd Qtr 6/5/2019 <1.0 1,280 <1.0 1.19 80.7 2.83
3rd Qtr 9/4/2019 <1.0 1,680 <1.0 1.93 76.2 3.08
4th Qtr 12/10/2019 <1.0 1,390 <1.0 1.78 83.2 0.977
1st Qtr 2/19/2020 <1.0 1,1.00 <1.0 <1.0 88.9 1.17
2nd Qtr 6/12/2020 <1.0 1,140 <1.0 <1.0 35.1 2.93
3rd Qtr 9/4/2020 <1.0 1,130 <1.0 2.57 70 0.42
(1) VOCs were resampled because laboratory missed holding time. g) As of March 2012 both north and south wild life ponds no lonler receivinuater. chlotoformsum2ni weTtVVT-S,TtaZ 76797r --- -4) 7177,37-n pt7m.n2 v7eMWAT47,70-4727arlTreirst7r7dinitilt7Tr NA = not analyzed Shaded indicates concentrations exceeding GWQS. Bold and italics indicates the MDL exceeded the GWOS.
TABLE 1 (3 of 31)
Historic Summary Of Monitoring Well Analytical Results Up To The 3rd Qarter 2020 Chloroform Contamination Investigation
DUSA White Mesa Mill
MW-32 (former 1W4-17)
Sampling Event
Parameter
(GWQS)
Carbon Tetrachloride
(5 pg/L)
Chloroform
(70 pg/L)
Chloromethane
(30 pg/L)
Methylene Chloride
(5 pg/L)
Chloride
No GWQS (mg/L)
Nitrate, Nitrate + Nitrite
(10 mg/L)
1st Qtr 3/16/2005 NA <1.0 NA NA NA <0.1
2nd Qtr 5/25/2005 NA <1.0 NA NA NA <0.1
3rd Qtr 8/31/2005 <1.0 <1.0 3.2 <1.0 NA <0.1
4th Qtr 12/7/2005 <1.0 <1.0 <1.0 <1.0 33 <0.1
1st Qtr 3/9/2006 <1.0 <1.0 <1.0 <1.0 32 <0.1
2nd Qtr 6/14/2006 <1.0 <1.0 3.5 <1.0 30 <0.1 3rd Qtr 7/20/2006 <1.0 <1.0 1.8 <1.0 32 <1.0 4th Qtr 11/8/2006 <1.0 <1.0 1.5 <1.0 31 <.1 1st Qtr 2/28/2007 <1.0 <1.0 <1.0 <1.0 32 <1.0 2nd Qtr 6/27/2007 <1.0 <1.0 <1.0 <1.0 32 <1.0 3rd Qtr 8/15/2007 <1.0 <1.0 <1.0 <1.0 31 <1.0 4th Qtr 10/10/2007 <1.0 <1.0 <1.0 <1.0 32 <1.0 1st Qtr 3/28/2008 <1.0 <1.0 <1.0 <1.0 31 <.1 2nd Qtr 6/25/2008 <1.0 <1.0 <1.0 <1.0 29 <1.0 3rd Qtr 9/10/2008 <1.0 <1,0 , <1.0 <1.0 30 <1.0 4th Qtr 10/15/2008 <1.0 <1.0 <1.0 <1.0 26 <0.05
1st Qtr 3/4/2009 <1.0 <1.0 <1.0 <1.0 , 30 <.1
2nd Qtr 6/23/2009 <1.0 <1.0 <1.0 <1.0 31 <0.1
3rd Qtr 9/14/2009 <1.0 <1.0 <1.0 <1.0 33 <0.1
4th Qtr 12/16/2009 <1.0 <1.0 <1.0 <1.0 35 <0.1
1st Qtr 2/17/2010 <1.0 <1.0 <1.0 <1.0 38 <0.1
2nd Qtr 6/14/2010 <1.0 <1 0 „.„ <1.0 <1.0 32 <0.1
3rd Qtr 8/16/2010 <1.0 <1.0 <1.0 <1.0 28 <0.1
4th Qtr 10/15/2010 <1.0 <1.0 <1.0 <1.0 24 <0.1
1st Qtr 2123/2011 <1.0 <1.0 <1.0 <1.0 40 <0.1
2nd Qtr 5/25/2011 .1.0 <1.0 <1.0 <1.0 31 <al 3rd Qtr 8/18/2011 <1.0 <1.0 <1.0 <1.0 33 <6.1 4th Qtr 11/16/2011 NA NA NA NA 32 <0.1
,, .(1.) 12/7/2011

1st Litrp) 1/18/2012
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
NA 2
ii
NA
<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 <al
4th Qtr 10/10/2012 <1.0 <1.0 <1.0 <1.0 35 <0.1
1st Qtr 2/11/2013 <1.0 <1.0 <1.0 <1.0 34.3 <0.1
2nd Qtr 6/18/2013 <1.0 <1.0 <1.0 <1.0 34.9 <0.1
3rd Qtr 9/3/2013 <1.0 <1.0 <1.0 <1.0 33 <0.1 4th Qtr 10/29/2013 <1.0 <1.0 <1.0 <1.0 35.7 <0.1 1st Qtr 1/29/2014 <1.0 <1.0, <1.0 <1.0 34 <0.1 2nd Qtr 5/23/2014 <1.6 <1.0 <1.0 <1.0 39.7 <0.1 3rd Qtr 8/26/2014 <1.0 <1.0 <1.0 <1.0 34 <0.1 4th Qtr 10/29/2014 <1.0 <1.0 <1.0 <1.0 34.9 <0.1
1st Qtr 3/17/2015 <1.0 <1.0 <1.0 <1.0 36.3 <0.1
2nd Qtr 6/11/2015 <1.0 <1.0 <1.0 <1.0 35.8 <0.1
3rd Qtr 9/9/2015 <1.0 <1.0 <1.0 <1.0 37.7 <0.1
4th Qtr 10/28/2015 <1 0 <1.0 <1 0 <1 0 34 7 <0.1
1st Qtr 3/22/2016 <1.0 <1.0 <1.0 <1.0 36.7 <0.1
Duplicate TW4-70 <1.0 <1.0 <1.0 <1.0 37.7 0.119
2nd Qtr 6/8/2016 <1.0 <1.0 <1.0 <1.0 36.4 <0.1
Duplicate TW4-70 <1.0 <1.0 <1.0 <1.0 37.7 <0.1 3rd Qtr 8/19/2016 <1.0 <1.0 <1.0 <1.0 35.7 <0.1 4th Qtr 10/31/2016 <1.0 <1.0 <1.0 <1.0 .......6,.9...:.1. l st Qtr 3/21/2017 <1;0 , <1.0 <1.0 <1.0 33.7 <0.1 2nd Qtr 6/21/2017 <1.0 <1.0 <1.0 <10, 37.2 <0.1 3rd Qtr 8/8/2017 <1,0, <1.0 <1.0 <1.0 38.1 <0.1
4th Qtr 10/12/2017 <1;0 <1.0 <1.0 <1.0
1st Qtr 3/15/2018 <1.0 <1.0 <1.0 <1.0 39.4 <0.1
Duplicate TW4-70 <1.0 <1.0 <1.0 <1.0 39.3 <0.1
2nd Qtr 6/14/2018 <1.0 <1.0 <1.0 <1.0 34.4 <0.1
3rd Qtr 9/22/2018 <1.0 <1.0 <1.0 <1.0 41.2 <0.1
4th Qtr 10/29/2018 <1.0 <1.0 <1.0 <1.0 32.9 <0.1
1st Qtr 3/19/2019 <1.0 1 <.0 . .. <1.0 <1.0 35,3 <0.1
2nd Qtr 6/18/2019 <1.0 <1,0 <1.0 <1.0 36.5 <0.1
3rd Qtr 9/11/2019 <1.0 <1.0 <1.0 <1.0 41.2 <0.1
4th Qtr 12/18/2019 <1.0 <1.0 <1.0 <1.0 , 36.3 <0.1 1st Qtr 3/18/2020 <1.0 <1.0 <1.0 <1.0 36 <0.1 Duplicate TW4-75 <1.0 <1.0 <1.0 <1.0 34.8 <0.1
2nd Qtr 6/12/2020 <1.0 , <1.0 <1.0 <1.0 35.6 <0.1
3rd Qtr 9/18/2020 <1.0 <1.0 <1,0 <1.0 34.7 <0.1
(1) VOCs were resampled because laboratory missed holding time. (2) As of March 2012 both north and south wild life ponds no longer receiving water. NA = not analyzed Shaded indicates concentrations exceeding GW05.
TABLE 1 (4 of 31)
Historic Summary Of Monitoring Well Analytical Results Up To The 3rd garter 2020 Chloroform Contamination Investigation DUSA White Mesa Mill
1W4-1 (chloroform pumping well Started in 1/1415)
Sampling Event
Parameter
(GWQS) Carbon Tetrachloride (5 pg/L) Chloroform (70 pg/L) Chloromethane (30 pg/L) Methylene Chloride
(5 pg/L)
Chloride
No GWQS (mg/L)
Nitrate, Nitrate + Nitrite
(10 mg/L)
1st Qtr 3/16/2005 NA 2,700 NA NA NA 9.1
2nd Qtr 5/25/2005 NA 3,080 NA NA NA 10.6 3rd Qtr 8/31/2005 <10 2,900 <10 <10 'NA 9.8 . .. 4th Qtr 12/7/2005 <50 2,400 <5 6 <50 52 9.7
1st Qtr 3/9/2006 <50 2,700 <50 <50 49 9.4 2nd Qtr 6/14/2006 <50 2,200 <50 <50 48 9.6 3rd Qtr 7/20/2006 <50 2,840 <50 <50 51 4th Qtr 11/8/2006 1.4 2,260 <1.0 01.0 47 9.2 1st Qtr 2/28/2007 1.2 1 900 <1.0 <1.0 , 47 8.9 2nd Qtr 6/27/2007 1.4 1,900 <1.0 <1.0 . . 45 9 3rd Qtr 8/15/2007 1.3 2,300 <1.0 <1.0 43 8.4 4th Qtr 10/10/2007 1.3 2 000 <1 0 <1.0 43 7.8 ._ ............... 1st Qtr 3/28/2008 1.3 2,060 <1.0 <1.0 39 7.6 2nd Qtr 6/25/2008 1.1 1,900 <1.0 <1.0 39 8.68 3rd Qtr 9/10/2008 1.3 1,700 <1.0 <1.0 35 8.15
4th Qtr 10i15i2008 1.3 1,700 <1.0 <1.0 41 9.3
lst Qtr 3/11/2009 1.1 1,700 <1.0 <1.0 37 7.5
2nd Qir 6/23/2009 1 1,500 <1.0 <1.0 37 6.9
3rd Qtr 9/14/2009 <1.0 1,700 <1.6 <1.0 36 7.3
4th Qtr ' 12/29/2009 <1.0 1 400 <1 0 <1.0 41 6.8 1st Qtr 3/3/2010 <1.0 1600 <1.0 <1.0 35 7.1
2nd Qtr 6/14/2010 1.2 „ 1,600 <1.0 <1.0 40 6.8
3rd Qtr 8/18/2010 1 1,600 <1.0 <1.0 35 6.7 4th Qtr 10/15/2010 <1.0 1500 <1.0 <1.0 40 6.6
1st Qtr 2/24/2011 <1.0 1,36.0 <1.0 <1.0 41 6.6 2nd Qtr 6/1/2011 <1.0 1,200 <1.0 <1.0 35 6.6 3rd Qtr 8/18/2011 <1.0 1,300 <1.0 <1.0 36 6 8 ..„ 4th Qtr 11/29/2011 <1.0 1,500 <1.0 <1.0 40 6.6 1 st Qtr I2i 1/24/2012 <1.0 1,300 <1.0 <1.0 38 6.8
2nd Qtr 6/14/2012 <1.0 1,000 <1.0 <1.0 42 7.1"
3rd Qtr 9/28/2012 <1.0 1,000 <1.0 <1.0 39 5.0
4th Qtr 10/4/2012 <1.0 :upo <1.0 <1.0 40 6.5 1st Qtr 2/13/2013 3.66 1,320 <1.0 <1.0 37.6 .„. 6.99 2nd Qtr 6/19/2013 <1.0 1,100 <1.0 <1.0 39.1 6.87 3rd Qtr 9/3/2013 <1.0 1,150 <1.0 <1.0 37.6 7.12 4th Qtr 11/14/2013 <1.0 1 280 <1.0 <1.0 36.5 7.08 1st Qtr 2/5/2014 5.47 1,090 <1.0 <1.0 38.9 7.74 2nd Qtr 5/23/2014 4.77 1,020 <1.0 <1.0 37.4 6.93 3rd Qtr 8/27/2014 <1.0 845 1.4 <1.0 38 4.80 4th Qtr 10/29/2014 <1 0 1 140 <1.0 <1.0 38.7 6.31
1st Qtr (2) 3/9/2015 <1r0 1,130 <1.0 <1.0 38.3 7.06 2nd Qtr 6/8/2015 <1.0 1,260 <1.0 <1.0 40.3 6.07 3rd Qtr 8/31/2015 <1.0 1,060 <1.0 <1.0 45.9 6.28 4th Qtr 10/19/2015 <1.0 1,040 <1.0 <1.0 38.5 1.55 1st Qtr 3/9/2016 <1.0 974 <1.0 <1.0 41.7 0.148
2nd Qtr 5/23/2016 <1.0 1,140 <1.0 <1.0 44.4 0.138
3rd Qtr 7/25/2016 <1.0 1,160 <1.0 <1.6 44.7 5.49
4th Qtr 10/13/2016 <1.0 I3.30 <1.0 <1.0 44.2 ..0.:7.46 1st Qtr 3/8/2017 <1.0 519 <1.0 <1.0 41.6 4.44
2nd Qtr 6/13/2017 <1.0 977 <1.0 <1.0 41.6 5.74 3rd Qtr 7/26/2017 <1.0 958 <1.0 <1.0 42.8 5.04 4th Qtr 10/11/2017 <1.0 556 <1.0 <1.0 38.5 5.78
Dmic sPlit...9.T.B.!P Ta-Ofi- 0 r 811-272M8 <7.6 <1 .0 810 70.4 <12 <1.0 <1.0 23 ,1 42 45.6 ...... 9,17. 4.8,1
2nd Qtr 6/8/2018 <1.0 942 <1.0 <1.0 42.0 4.36
3rd Qtr 8/22/2018 ,<1.0 1,010 <1.0 <1.0 47.3 4.30 4th Qtr 10/22/2018 <1.0 752 <1.0 <1.0 43.2 4.57 DWMRC split sample <5.0 210 <5.0 <5.0 NA 0.46 1st Qtr 3/8/2019 <1.0 87.2 <1.0 <1.0 40.9 4.51 2nd bir 6/5/2019 <1.0 1,040 <1.0 <1.0 44.8 1.43 3rd Qtr 9/4/2019 , <1.0 894 <1.0 <1.0 46 1.65 4th Qtr 12/10/2019 <1.0 1,070 <1.0 <1.0 44.2 3.91 1st Qtr 2/19/2020 <1.0 1,190 <1.0 <1.0 47.5 4.67 2nd Qtr 5/27/2020 <1.0 499 <1.0 <1.0 46.4 0.44
Srd Qtr 9/4/2020 <1.0 1,060 <1.0 <1.0 43.7 2.22
(1.2.As of March 2012 both north and south wild lifesonds no lorler recel j2_mv4-1 concerted to a chloro orm enpinevell started int/14/15 (3) chloroform pumea well TW4-41 started M MaL2018
NA = not analyzed
Shaded indicates concentrations exceeding GWQS.
Bold and italics indicates the MDL exceeded the GWQS. J = Approximated value
TABLE 1 (5 of 31)
Historic Summary Of Monitoring Well Analytical Results Up To The 3rd Qarter 2020
Chloroform Contamination Investigation
DUSA White Mesa Mill
TW4-2 (chloroform pumping wall starling 1/14/15)
Sampling Event
Parameter
(GWQS)
Carbon Tetrachloride
(5 pg/L)
Chloroform
(70 pg/L)
Chloromethane
(30 pg/L)
Methylene Chloride
(5 pg/L)
Chloride
No GWQS (mg/L)
Nitrate, Nitrate + Nitrite
(10 mg/L)
1st Qtr 3/16/2005
2nd Qtr 5/25/2005
3rd Qtr 8/31/2005
4th Qtr 12/7/2005
1st Qtr 3/9/2006
2nd Qtr 6/14/2006
3rd Qtr 7/20/2006
4th Qtr 11/8/2006
1st Qtr 2/28/2007
2nd Qtr 6/27/2007
3rd Qtr 8/15/2007
4th Qtr 10/10/2007
1st Qtr 3/28/2008
2nd Qtr 6/25/2008
3rd Qtr 9/10/2008
4th Qtr 10/15/2008
11/18/2008
1st Qtr 3/11/2009
2nd Qtr 6/23/2009
3rd Qtr 9/14/2009
4th Qtr 12/29/2009
1st Qtr 3/3/2010
2nd Qtr 6/14/2010
3rd Qtr 8/18/2010
4th Qtr 10/15/2010
1st Qtr 2/24/2011
2nd Qtr 6/2/2011
3rd Qtr 8/17/2011 4th Qtr 11/29/2011 .tit-Qtl'ar. -1714/25.1i2
-2nd Qtr 6/14/2012
3rd Qtr 9/4/2012
4th Qtr 10/4/2012
1st Qtr 2/13/2013
2nd Qtr 6/19/2013
3rd Qtr 9/3/2013
4.112.gr..... .. .:11.1.1.412011 . 'ist Qtr 2/6/2014
2nd Qtr 5/23/2014
3rd Qtr 8/27/2014
4th Qtr 10/30/2014
1st Qtr (2) 3/9/2015
2nd Qtr 6/8/2015
3rd Qtr 8/31/2015
4th Qtr 10/19/2015
1st Qtr 3/9/2016
2nd Qtr 5/23/2016
3rd Qtr 7/25/2016
4th Qtr 10/12/2016
1st Qtr 3/8/2017
2nd Qtr 6/13/2017
3rd Qtr 7/26/2017
4th Qtr 10/11/2017 DWMRC split sample
DWMRC dtiplicate TW4-50
1st Qtr 3/12/2018
2nd Qtr 6/8/2018
3rd Qtr 8/22/2018
4th Qtr 10/22/2018
1st Qtr 3/8/2019
2nd Qtr 6/5/2019
3rd Qtr 9/4/2019
4th Qtr 12/10/2019
1st Qtr 2/19/2020
2nd Qtr 6/10/2020
3rd Qtr 9/4/2020
NA
NA
<10
<50
3,700
3,750
3,900
3,500
NA
NA
<10
<50
NA
NA
<10
<50
NA
NA
NA
56
7.7
8.6
8.0
7.8
<50
<50
<50
2.3
3,800
3,200
4,120 3420
<50
<50
<50 <1.0
<50
<50
<50
<1.0
56
56
54
55
7.5
7.1
7.4
7.6
1.8 2,300
2.5 3,000
2.2 340
2.1 3200
<1.0
<1.0
<1.0 <1.0
<1.0
<1.0
<1.0 <1.0
54 7.3
50 7.8
49 7.3
51 6.9
2.3
2.2
2.4 NA
2.4
3,300
3,100
2,800 NA
3.200
<1.0
<1.0
<1.0
NA
<2.0
<1.0
<1.0
<1.0
NA
<2.0 NA
48 6.9
46 7.4
42 7.1
47 8.0
NA 2.2
2
2
2
3,100
2,800
3,000
1 600
<1.0
<1.0 <1.0
<1.0
<1.0
<1.0 <1.0
<1.0
46 6.5
44 6.4
43 6.6
46 6.4
2
2.6
2.5
2.1
2,600
3,300
3,300
8,990
<1.0
<1.0
<1 0
<1 0
<1.0
<1.0
<1.0
<1.0
42
43
43
41
6.8 8.7
6.6
6.5
2.4
2.2
1.6
2.8
3,100
3,000
2,400 3,990
<1.0
<1.0
<1.0 <1.0
<1.0
<1.0
<1.0
<1.0
46 ................. 7.0
42 6.8
48 6.0 49 7.0 2
2.1
1.8
2
2,500
2,500
2,900
3.,:1.00
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
49
52
76
49
7.1
7.7 4.0
7.6
5.17
2.65
2.41 3,15
8,580
3,110
3,480 3240 ...........
<1.0
2
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
46
46.9
44 9
43.9
6.1
7.51
9.3
8.39 7.1
6.05
1.4
2.6
8,180
2,930
3,170
3 580
<1.0 <1.0
3.6
<1.0
<1.0
<1.0
<1.0
<1.0
45.9 45 4
45
45.5
7.87
9.11
6.2
8.45
1.44
<1.0
<1.0
2 6
1,840
1,650
1,060
2 070
<1.0
<1.0
2.6
<1.0
<1.0
<1.0
<1.0
<1.0
44.9
48.1
50
41.9
5.32 4.3
3.76 5 18
1.2
1.49
<1.0
<1.0
1,970
2,070
1,780
1 600
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
43.4
43.8
42.9
44.3
5.30
5.67
4.07
6.07
<1.0
<1.0
<1.0
<1.0
<19 <19
1, i()
1,940
1,310
1,610
1,200 :12po
<1.0
<1.0
<1.0
<1.0
<30
<30
<1.0
<1.0
<1.0
<1.0 68 J
60 J
43.1
43.6
43.2
43.5
44
43
4.74
4.90
5.09
3.25
4.00
5.00 <1.0
<1.0
<1.0
<1.0
764
949
980
822
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
44.4
41.3
44.3
41.7
2.94
3.50
4.83
3.52
<1.0
<1.0
<1.0
<1.0
1,040
1,360
797
934
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
40.4
39.8
40.8
41.5
3.9.
4.38
4.79
3 40
<1.0
<1.0
<1.0
1,880
1,070
1,260
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
42.1
40.6 41.3
6.07
3.62 3.35
SaAs of March 2012 both north ei id south wild life.2onds no lonzr receivinLwater.
S2TW4-2 and TW4-11 converted to a chloroform iumpinlwell started in 1/14/15
NA = not analyzed
Shaded indicates concentrations exceeding GWQS.
Bold and italics indicates the MDL exceeded the GWQS.
J = Approximated value
TABLE 1 (6 of 31) Historic Summary Of Monitoring Well Analytical Results Up To The 3rd Qarter 2020
Chloroform Contamination investigation
DUSA White Mesa Mill
TW4-3
Sampling Event Parameter
(GWQS) Carbon Tetrachloride (6 pg/L) Chloroform
(70 pg/L)
Chloromethane
(30 pg/L)
Methylene Chloride
(6 pg/L)
Chloride
No GWQS (mg/L)
Nitrate, Nitrate + Nitrite
(10 mg/L)
1st Qtr 3/16/2005 NA <1 0 NA NA NA 3 5 2nd Qtr 5/25/2005 NA <1 0 NA NA NA 3 7 3rd Qtr 8/31/2005 <1 0 <1 0 6 4 <1 0 NA 3 5 4th_Qtr 12/7/2005 <1 0 <1 0 <1 0 <1 0 26 3 3 1st Qtr 3/9/2006 <1 0 <1 0 2 3 <1 0 26 9 3 2nd Qtr 6/14/2006 <1 0 <1 0 1 6 <1 0 26 7 1 3rd Qtr 7/20/2006 <1 0 <1 0 2 2 <1 0 26 2 9 4th Qtr 11/8/2006 .<1 0 • <1 0 - <1 0 <1 0 23. 1 5 1st Qtr 2/28/2007 <1 0 <1 0 <1 0 <1 0 22 3 1 2nd Qtr 6/27/2007 <1 0 <1 0 <1 0 <1 0 23 3 3 3rd Qtr 8/15/2007 <1 0 <1 0 <1 0 <1 0 24 3 1 4th Qtr 10/10/2007 .<1 0 • <1 0 <1 0 <1 0 27 2 8 1st Qtr 3/28/2008 <1 0 <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 4th Qtr 10/15/2008 .<1 0 <1 0 <1 0 <1 0 22 2 6 1st Qtr 3/4/2069 <1 0 <1 0 <1 0 <1 0 21 2 5 2nd Qtr 6/23/2009 <1 0 <1 0 <1 0 <1 0 20 2 9 3rd Qtr 9/14/2009 <1 0 <1 0 <1 0 <1 0 21 2 8 4th Qtr 12/29/2009 .<1 0 <1 0 <1 0 <1 0 22 2 6 1st Qtr 2/23/2010 <1 0 <1 0 <1 0 <1 0 23 2 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
4th Qtr 10/15/2010 <1 0 <1 0 <1 0 <1 0 26. • 3 3 1st Qtr 2/15/2011 <1 0 <1 0 <1 0 <1 0 23 3-6 2nd Qtr 5/25/2011 <1 0 <1 0 <1 0 <1 0 23 3 7 3rd Qtr 8/17/2011 <1 0 <1 0 <1 0 <1 0 23 4 0 4th Qtr 11/14/2011 <1 0 <1 0 <1 0 <1 0 23 4 4 1st Otr (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 44 3rd Qtr 8/28/2012 <1 0 <1 0 <1 0 <1 0 25 4 9 4th Qtr 10/3/2012 .<1 0 <1 0 <1 0 <1 0 25 4 8 1st Qtr 2/7/2013 <1 0 <1 0 <1 0 <1 0 23 7 5 05 2nd Qtr 6/28/2013 <1 0 <1 0 <1 0 <1 0 23 8 5 83 3rd Qtr 9/3/2013 <1 0 <1 0 <1 0 <1 0 25 4 90
4th Qtr 11/8/2013 .<1 0 <1 0 <1 0 <1 0 24 1 5 89
1st Qtr 1/22/2014 <1 0 <1 0 <1 0 <1 0 24 9 6 66 2nd Qtr 5/21/2014 <1 0 <1 0 <1 0 <1 0 24 4 6 01 3rd Qtr 8/13/2014 <1 0 <1 0 <1 0 <1 0 26 5 30 4th Qtr 10/23/2014 .<1 0 • <1 0 <1 0 <1 0 26 7 6 07 1st Qtr 3/11/2015 <1 0 <1 0 <1 0 <1 6' 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 10/21/2015 <1 0 <1 0 <1 0 <1 0 25 6 5 37 1st Qir -9/1 5/2016 <1 0 <1 0 <1 0 <1 0 32 8 6 83 2nd Qtr 5/25/2016 <1 0 <1 0 <1 0 <1 0 27 9 5 65
3rd Qtr 7/27/2016 <1 0 <1 0 <1 0 <1 0 26 5 6 10
4th Qtr 10/19/2016 .<1 0 <1 0 <1 0 <1 0 29 5 6 00 1st Qtr 3/14/2017 <1 0 <1 0 <1 0 <1 0 28 1 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 10/11/2017 <1 0 <1 0 <1 0 <1 0 25 9 6 32 1st Qtr 3/14/2018 <1 0 <1 0 <1 0 <1 0 29 8 6 46 Duplicate TW4-65 <1 0 <1 0 <1 0 <1 0 29 5 6 31 2nd Qtr 6/8/2018 <1 0 <1 0 <1 0 <1 0 26 1 6 52 3rd Qtr 8/29/2018 <1 0 <1 0 <1 0 <1 0 31 0 5 53 Duplicate TW4-65 <1 0 <1 0 <1 0 <1 0 31 0 5 44
4th Qtr 11/30/2018 <1 0 <1 0 <1 0 <1 0 27 4 5 85
Duplicate TW4-65 .<1 0 • <1 0 <1 0 <1 0 26 2 5 77
1st Qtr 3/13/2019 <1 0 <1 0 <1 0 <1 0 25 5 5 82 2nd Qtr 6/13/2019 <1 0 <1 0 <1 0 <1 0 27 4 6 68 Duplicate TW4-65 <1 0 <1 0 <1 0 <1 0 25 9 6 60 3rd Qtr 9/11/2019 <1 0 <1 0 <1 0 <1 0 26 0 5 12 Duplicate TW4-65 <1 0 <1 0 <1 0 <1 0 22 1 5 76 4th Qtr 12/12/2019 .<1 0 <1 0 <1 0 <1 0 28 5 91 1st Qtr 3/17/2020 <1 0 <1 0 <1 0 <1 0 27 7 6 15
Duplicate TIN4-65 <1 0 <1 0 <1 0 <1 0 26 6 38
2nd Qtr 6/10/2020 <1 0 <1 0 <1 0 <1 0 26 2 6 53 Duplicate TW4-65 <1 0 <1 0 <1 0 <1 0 26 7 6 63 3rd Qtr 9/17/2020 <1 0 <1 0 <1 0 <1 0 25 9 6 36
NA = not analyzed Shaded indicates concentrations exceeding GWQS
TABLE 1 (7 of 31)
Historic Summary Of Monitoring Well Analytical Results Up To The 3rd Qarter 2020
Chloroform Contamination Investigation
DUSA White Mesa Mill
T1N4.4 (chloroform pumping well stared in 1st qtr 2010)
Sampling Event Parameter
(GWQS) Carbon Tetrachloride
(5 pg/L)
Chloroform
(70 pg/L)
Chloromethane
(30 pg/L)
Methylene Chloride (5 pg/L) Chloride No GWQS (mg/L)
Nitrate, Nitrate + Nitrite
(10 mg/L) 1st Qtr
2nd Qtr 6rd Qtr
40h Qtr
1st Qtr
2nd Qtr 3r1 Qtr 4th Qtr 1st Qtr 2nd Qtr
3rd Qtr
4th Qtr
1st Qtr 2nd Qtr 3rd Qtr 4th Qtr 1st Qtr 1st Qtr 2nd Qtr
3rd Qtr
4th Qtr
1st Qtr (2)
2nd Qtr. 3rd Qtr 4th Qtr
1st Qtr
2nd Qtr
3rd Qtr
4th Qtr.. . fifatfifi.
2nd Qtr 3rd Qtr 4th Qtr
1st Qtr
2nd Qtr
3rd Qtr
zith Qtr
1st Qtr 2nd Qtr
3rd Qtr
4th Qtr
1st Qtr (4)
2nd Qtr
3rd Qtr 4t6 Qtr 1st Qtr r-i'd Qtr 3rd Qtr 4th Qtr 1st Qtr 2nd Qtr
3rd Qtr
4th Qtr
1st Qtr na-am-
3rd Qtr 4th Qtr 1st Qtr 2nd Qtr 3rd Qtr 4th Qtr 1st Qtr
2nd Qtr
3rd Qtr
3/16/2005
5/25/2005
8/31/2005
12/7/2005
3/9/2006
6/14/2006 7/20/2006 11/8/2006
2/28/2007
6/27/2007
8/15/2007
10/10/2007
3/28/2008 6/25/2008 9/10/2008 10/15/2008 11/18/2008 3/4/2009 6/23/2009 9/14/2009
12/29/2009
2/17/2010 6/14/2010 8/10/2010 10/15/2010 2/23/2011 6/1/2011 8/17/2011
11/16/2011
1/23/2012
6/6/2012 6/4/2012 10/3/2012 2/11/2013 6/29/2013 9/3/2013
10/23/2013
1/27/2014
5/19/2014
8/11/2014 10/21/2014
3/9/2015
6/10/2015
8/31/2015 10/19/2015 3/9/2016 5/23/2016 7/27/2016 10/13/2016 3/8/2017 6/13/2017
.7/26/2017 10/11/2017 3/12/2018
6/8/2018
8/22/2018 11/28/2018 3/8/2019 6/5/2019 9/4/2019 12J10/2019 2/19/2020
5/27/2020
9/4/2020
NA
NA
<10
<50
<50
<50 <50
NA <2.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
1.7
1.5
1.7
1.5
1.5
1.6
1.5
1.4
1.2 1.2 1.1 1 1
1
1.2
1.3
1.3 1.4 1.2
1.2 1 1
1.2 5.3
3.88
4.94
4.94
1.05
1.21
NA
3,100 2,406 3,200
2,800 2,900
2,600
2,850
2,670
2,200 2,400
2,700
.2,500
2,860
2,500
2,200
.2,500
.2,200
1,800 2,000 950 1,700
1,700
2,160
1 700 1,800 1,700 1 500 1500 1,200
, 1,500
1,600 1,400 1,460 1,330 1,380
.....1,360 1,260
1,220
1,320 1 130
1,350 1,280
1,220
1,190
1,190
1,780
NA NA
<10
<50 <50
<50
<50
<1.0 <1.0 <1.0 <1.0 <1.0
<1.0
<1.0
<1.0
NA
<2.0
<1.0
<1.0 <1.0 <1.0 <1.0
<1.0
<1.0
<1.0 <1.0 <1.0 <1.0 <1.0 <1.0
<1.0
<1.0 <1.0 <1.0 <1.0 <1.0 <1.0 <1 0
<1.0
<1.0
<1.0 <1.0
<1.0
<1.0
<1.0
7.1
1.72
NA NA <10 <50
<50
<50
<50
<1.0 <1.0 <1.0 <1.0 <1.0 <1.0 <1.0 <1
NA
<2.0
<1.0
<1.0 <1.0 <1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0 <1.0 <1.0 <1.0
<1.0
<1.0
<1.0
<1.0
<1.0 <1.0
<1.0 <1.0 <1.0 <1.0 <1.0
<1.0 <1.0 <1.0 <1.0
<1.0
<1.0
.
,NA NA NA
54
51 48 50
49
49
47
45
47 43 42 39
„. . 44 NA 37
34
39
41
48
35 36 38
.41
35
40
39
38
43 39 38
39
39.6
38.8
43.9 37.4
47.5 40 40
37.6
41.3 45.8 38.5 39.7 41.9
10.0
11.3
9.9
10.2 9.5 8.6 9.7
10.1
9.0
9.4
9.5
9.5
9.2
10.8
„ 8.,8 10.1 NA 10.2 8.2 8.4
7.6
6.6 7.6
7.3 7.1
„ 7,2 .. 7.0
. 6.6 ' ......7,0. 7.1
7.1 7.1 7.0 7.36 6.30 7.22
7.84
7.28
6.91
5.3 7.02
7.7
6.33
6.45
6.27 6.7 6.56 <1.0 1,380 <1.0 <1.0 40.2 7.22 <1.0 <1.0 <1.0 <1.0 <1.0 <1.0
<1.0
<1.0 <1.0 <1.0 <1.0 <1.0 <1.0 <1.0
<1.0
<1.0
1430
1,290 1,290 1 290 11.20 1 -10 1,050
1,030
1,140
1,050
1,070
989
.11.40
1,160 1,140 1,110
<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 , ,
40.3
41.7
40.7
40.5
40.7
42.2
39.0
44.6 41.4 38.3 38.5 39.4 40.4
43.4
46.1 40.0
6.77 6.87 7.06 6.47
.......§,PP. 6.12
6.34
6.10 6.02 7.26 10.40 6.32 6.52 4.58
7.26
7.04 (1lAs of March 012 both north and south mid Itte2onds no loraer recemng water jaTW4-4 converted to a Chloro ormrmanlwell stared in 1st gtr 2010 (3) TtN4-41 installed as a Chloro orm2umanawell stared in Mu 2018 .S4.2,TW4-2 convert,td to a chloroform Eimpinvell started in 1/14/15
NA = not analyzed
Shaded indicates concentrations exceeding GWQS.
Bold and italics indicates the MDL exceeded the GWQS.
TABLE 1 (8 of 31)
Historic Summary Of Monitoring Well Analytical Results Up To The 3rd Qarter 2020 Chloroform Contamination Investigation
DUSA White Mesa Mill
TW4-5
Sampling Event
Parameter
(GWQS)
Carbon Tetrachloride
(5 pg/L)
Chloroform
(70 pg/L)
Chloromethane
(30 pg/L)
Methylene Chloride
(5 pg/L)
Chloride
No GWQS (mg/L)
Nitrate, Nitrate + Nitrite
(10 mg/L)
1st Qtr 3/16/2005 NA 120 NA NA NA 4.9 2nd Qtr 5/25/2005 NA 113 NA NA NA 3.7 3rd Qtr 8/31/2005 <2.5 82 5.8 <2.5 NA 6.0
4th Qtr 12/7/2005 lst Qtr 3/9/2006
<2.5
<2.5
63
66
2.5
3.1
<2.5
<2.5
56
52 §.:P .6.6
2nd Qtr 6/14/2006 <2.5 51 3.1 <2.5 51 5.9 3rd Qtr 7/20/2006 <1.0 53.7 <1.0 <1.0 54 6.7 4th Qtr 11/8/2006 <1.0 47.1 <1.0 <1.0 55 2.9 ............. 1st Car 2/28/2007 <1.0 35 <1.0 57 7..8 <1.0 2nd Qtr 6/27/2007 <1.0 26 <1.0 <1.0 45 7.0 3rd Qtr 8/15/2007 <1.0 9.2 <1.0 <1.0 38 7.7 4th Qtr 10/10/2007 <1.0 9.4 <1.0 <1.0 39 ......§..:?, 1st Qtr 3/28/2008 <1.0 11 <1.0 <1.0 .8. 7. 2nd Qtr 6/25/2008 <1.0 9.3 <1.0 <1.0 37 8.7 3rd Qtr 9/10/2008 <1.0 11 <1.0 <1.0 34 7.9 4th Qtr 10/15/2008 <1.0 10 <1.0 <1.0 37 9.3 1st Qtr 3/4/2009 <1.0 12 <1.0 <1.0 34 7.9
2nd Qtr 6/23/2009 <1.0 13 <1.0 <1.0 37 7.5 3rd Qtr 9/14/2009 <1.0 12 <1.0 <1.0 48 8.3
4th Qtr 12/29/2009 <1.0 8.5 <1.0 <1.0 41 7.5
1st Qtr 2/25/2010 <1.0 13 <1.0 <1.0 43 6.8
2nd Qtr 6/14/2010 <1.0 12 <1.0 <1.0 28 7.1
3rd Qtr 8/11/2010 <1.0 12 <1.0 <1.0 38 7.0
4.,S12.P.IL .....1P1.1512P.19. fLP.. 11 <1.0 <1.0 41 ......7..: '1st Qtr 2/22/2011 <1.0 10 <1.0 <1.0 34 ..6
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 4th Qtr 11/16/2011 NA NA NA NA 30 6.0 (1). 12/7/2011 <1.0 7.9 <1.0 <1.0 NA NA TifOfF(2y 1/18/2012 <1.0 7.6 <1.0 <1.0 22 5.8 .2nd Qtr 6/6/2012 <1.0 8.4 <1.0 <1.0 39 8.ð
3rd Qtr 9/11/2012 <1.0 12.0 <1.0 <1.0 37 8.1
4th Qtr 10/4/2012 <1.0 8.0 <1.0 <1.0 38 7.7
1st Qtr 2/13/2013 <1.0 10.8 <1.0 <1.0 34.3 8.24
2nd Qtr 6/13/2013 <1.0 11.2 <1.0 <1.0 36.5 10.70
3rd Qtr 9/5/2013 <1.0 11.6 <1.0 <1.0 39.1 7.79 4th Qtr 11/13/2013 <1.0 14.4 <1.0 <1.0 41.1 7.75 1st Qtr 1/30/2014 <1.0 12.5 <1.0 <1.0 40.5 9.16 2nd Qtr 5/22/2014 <1.0 13.4 <1.0 <1.0 51.4 7.78 3rd Qtr 8/14/2014 <1.0 12.0 <1.0 <1.0 44 7.2 4th Qtr 10/13/2014 <1.0 14.6 <1.0 <1.0 45.1 8.31
1st Qtr 3/12/2015 <1.0 13.8 <1.0 <1.0 45.1 9.32
Duplicate TW4-70 <1.0 13.8 <1.0 <1.0 46.4 8.81
2nd Qtr 6/10/2015 <1.0 13.3 1.07 <1.0 47.3 7.08
3r8 Qtr 9/33/2015 <1.0 12.9 <1.0 <1.0 52.2 8.1
4th Qtr 10/28/2015 <1.0 11.0 <1.0 <1.0 43.6 8.03
1st Qtr 3/17/2016 <1.0 11.0 <1.0 <1.0 44.7 10.2
2nd Qtr 5/23/2016 <1.0 13.6 <1.0 <1.0 45.9 8.98
3rd Qtr 8/3/2016 <1.0 10.8 <1.0 <1.0 44.6 8.49 4th Qtr (3) 10/26/2016 <1.0 9.9 <1.0 <1.0 47.8 8.32
Duplicate TW4- 75 <1.0 - 12.0 <1.0 <1.0 49.5 8.34
'1 st Qtr 3/15/2017 <1.0 12.6 <1.0 <1.0 44.7 8.46
2nd Qtr 6/15/2017 <1.0 14.6 <1.0 <1.0 47.3 8.52 3rd Qtr 8/8/2017 <1.0 14.6 <1.0 <1.0 48.6 8.52 4th Qtr 10/11/2017 <1.0 13.8 <1.0 <1.0 42.5 8.57 DWMRC ggsampA <0.19 12 <0.3 <0.32 47 8.6 1st Qtr 3/12/2018 <1.0 15.2 <1.0 <1.0 51.2 8.36 2nd Qtr 6/13/2018 <1.0 13.9 <1.0 <1.0 47.3 9.24 3rd Qtr 8/30/2018 <1.0 15.4 <1.0 <1.0 54.7 7.34
Duplicate TW4-70 <1.0 15.3 <1.0 <1.0 55.9 7.28
4th Qtr 11/28/2018 <1.0 15.6 <1.0 <1.0 49.8 7.67
Oggr.isate TW4-70 <1.0 16.2 <1.0 <1.0 48.5 7.80
1st Qtr 3/16/2019 <1.0 14.1 <1.0 <1.0 47.6 7.38
2nd Qtr 6/13/2019 <1.0 15.8 <1.0 <1.0 49.3 7.62
3rd Qtr 9/11/2019 <1.0 14.6 <1.0 <1.0 46.1 7.04
Duplicate TW4-70 <1.0 13.6 <1.0 <1.0 45.8 6.89
4th Qtr 12/14/2019 <1.0 15.7 <1.0 <1.0 53.1 6.97
CbAcate TW4-70 <1.0 16.0 <1.0 <1.0 52.5 7.29 <1.0 14.8 <1.0 48.3 1st Qtr 3/17/2020 <1.0 7.10 Duplicate TW4-70 <1.0 14.8 <1.0 <1.0 48.4 7.72 2nd Qtr 6/11/2020 <1.0 15.4 <1.0 <1.0 49.5 7.83 3rd Qtr 9/18/2020 <1.0 14.8 <1.0 <1.0 47.0 6.37
(1) VOCs were resampled because laboratory mussed holding time (2) As of March 2012 both north and south ww, (31chlorotorrtuumkm well TW4-39 started in 11)20/16 -NA zt analyzed Shaded indicates concentratons exceeding GWOS.
TABLE 1 (9 of 31)
Historic Summary Of Monitoring Well Analytical Results Up To The 3rd Qarter 2020 Chloroform Contamination Investigation DUSA White Mesa Mill
TW4-6
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 (mg/L)
Nitrate, Nitrate + Nitrite
(10 mg/L) 1st Qtr 3/16/2005 NA <1.0 NA NA NA 0.2 2nd Qtr 5/25/2005 NA 2.5 NA NA NA 0.4 3rd Qtr 8/31/2005 <1.0 10 2.8 <1.0 NA 0.8 4th Qtr 12/7/2005 <1.0 17 1.3 <1.0 32 0.9 1st Qtr 3/9/2006 <1.0 31 <1.0 <1.0 31 1.2 2nd Qtr 6/14/2006 <1.0 19 <1.0 <1.0 30 1.0 3rd Qtr 7/20/2006 <1.0 11 <1.0 <1.0 37 0.6 4th Qtr 11/8/2006 <1.0 42.8 <1.0 <1.0 65 1.4 1st Qtr 2/28/2007, <1.0 46 <1.0 <1.0 32 1.8 2nd Qtr 6/27/2007 <1.0 11 <1.0 <1.0 38 0.6 3rd Qtr 8/15/2007 <1.0 18 <1.0 <1.0 36 0.7 4th Qtr 10/10/2007 <1.0 18 <1.0 <1.0 35 0.8 1st Qtr 3/28/2008 <1.0 52 <1.0 <1.0 33 1.1 2nd Qtr 6/25/2008 <1.0 24 <1.0 <1.0 35 0.9 3rd Qtr 9/10/2008 <1.0 39 <1.0 <1.0 35 1.1 4th Qtr 10/15/2008 <1.0 37 <1.0 <1.0 33 ........ 1.0 1st Qtr 3/4/2009 <1.0 81 <1.0 <1.0 35 2.2 2nd Qtr 6/23/2009 <1.0 120 <1.0 <1.0 37 2.7 3rd Qtr 9/14/2009 <1.0 280 <1.0 <1.0 37 5.0 4th Qtr 12/29/2009 <1.0 250 <1.0 <1.0 41 6.1 -1st Qtr (5) 2/25/2010 <1.0 1000 <1.0 <1.0 45 1.8 2nd Qtr 6/14/2010 <1.0 590 <1.0 <1.0 33 2.5 3rd Qtr 8/11/2010 <1.0 630 <1.0 <1.0 31 3.9 4th Qtr 10/15/2010 <1.0 420 <1.0 <1.0 41 4.3 1st Qtr 2/22/2011 <1.0 47 <1.0 <1.0 40 0.7 2nd Qtr 5/26/2011 <1.0 9.6 <1.0 <1.0 42 0.3 3rd Qtr 8/7/2011 <1.0 16 <1.0 <1.0 39 0.3 4th Qtr 11/16/2011 NA NA NA NA 36 0.8 (1) 12/7/2011 <1.0 21 <1.0 <1.0 NA NA
(2).. 1.11.16.12011. <1.,0. 50 <1.0 <1.0 33 0.8 Tiftlifi4y ---..i/18/201 .10 8 <1.0 <1.0 38 0.7
'2nd Qtr 6/6/2012 <1.0 4.7 <1.0 <1.0 40 0.2 3rd Qtr 9/11/2012 <1.0 6.9 <1.0 <1.0 21 0.1 4th Qtr 10/4/2012 <1.0 9 <1.0 <1.0 41 0.2 1st Qtr 2/13/2013 <1.0 6.89 <1.0 <1.0 40.4 0.2 2nd Qtr 6/13/2013 <1.0 4.86 <1.0 <1.0 37.9 0.2 3rd Qtr 9/5/2013 <1.0 5.93 <1.0 <1.0 40.6 0.2 4th Qtr 11/13/2013 <1.0 5.51 <1.0 <1.0 40.2 1.5 1st Qtr 1/29/2014 <1.0 5.7 <1.0 <1.0 40.6 0.2 2nd Qtr 5/22/2014 <1.0 10.3 <1.0 <1.0 37 0.3 3rd Qtr 8/14/2014 <1.0 202 <1.0 <1.0 40 4.2
(3) 9/24/2014 <1.0 260 <1.0 <1.0 NA NA 4th Qtr 10/29/2014 <1.0 723 <1.0 <1.0 41.1 .6.:9 1st Qtr 3/12/2015 <1.0 1,180 <1.0 <1.0 41.2 5.3 2nd Qtr 6/10/2015 <1.0 1,040 <1.0 <1.0 41.6 5.9 3rd Qtr 9/10/2015 <1.0 1,040 <1.0 <1.0 47 6.8 4th Qtr 10/29/2015 <1.0 _ 843 <1.0 <1.0 40.2 5.6 1st Qtr 3/22/2016 <1.0 -84-<1.0 <1.0 42.3 6.79 2nd Qtr 6/8/2016 <1.0 486 <1.0 <1.0 44.1 3.19 3rd Qtr 7/27/2016 <1.0 433 <1.0 <1.0 42.2 3.85 4th Qtr 10/26/2016 <1.0 301 <1.0 <1.0 46.1 3.74 1st Qtr 3/16/2017 <1.0 288 <1.0 <1.0 42.1 3.15 2nd Qtr 6/21/2017 <1.0 239 <1.0 <1.0 42.6 2.42 3rd Qtr 8/8/2017 <1.0 129 <1.0 <1.0 42.9 1.71 4th Qtr 10/11/2017 <1.0 121 <1.0 <1.0 37.6 1.71 1st Qtr 3/20/2018 <1.0 159 <1.0 <1.0 43.1 1.96 '2nd Qtr (6) 6/14/2018 <1.0 74.9 <1.0 <1.0 40.2 3rd Qtr 9/5/2018 <1.0 53.2 <1.0 <1.0 44 1.18 4th Qtr 12/12/2018 <1.0 37.0 <1.0 <1.0 20.0 0.90 1st Qtr 3/19/2019 <1.0 23.2 <1.0 <1.0 41 0.755 2nd Qtr 6/13/2019 <1.0 15.8 <1.0 <1.0 38.1 0.484 3rd Qtr 9/11/2019 <1.0 15.8 <1.0 <1.0 39.7 0.412 4th Qtr 12/14/2019 <1.0 7.4 <1.0 <1.0 45.7 0.244 1st Qtr 3/17/2020 <1.0 6.93 <1.0 <1.0 43.2 0.222 2nd Qtr 6/11/2020 <1.0 4.9 <1.0 <1.0 42.4 0.205 3rd Qtr 9/18/2020 <1.0 3.6 <1.0 <1.0 40.5 0.144
(1) VOCs were resampled because laboratory missed holding time.
(2) Results of the TW4-70 the duplicate sample for TW4-6.
(3) Reanalyzed for VOCs only. (4) As of March 2012 both north and south wild lifeloonds no loraer receiyinerater. AChloroform_puraira well TW4-4 stared in 1st cilz 2010
161Chloroform_pumlia well T1N4-41 installed MaL2018
NA = not analyzed
Shaded indicates concentrations exceeding GWQS.
TABLE 1 (10 of 31)
Historic Summary Of Monitoring Well Analytical Results Up To The 3rd Qarter 2020
Chloroform Contamination Investigation
DUSA White Mesa Mill
TW4-7
Sampling Event Parameter
(GWQS) Carbon Tetrachloride (5 pg/L) Chloroform (70 pg/L) Chloromethane
(30 pg/L)
Methylene Chloride
(5 pg/L)
Chloride
No GWQS (mg/L)
Nitrate, Nitrate + Nitrite
(10 mg/L) 1st Qtr 3/16/2005 NA 3,100 NA NA NA 5.2 2nd Qtr 5/25/2005 NA 2700 NA NA NA 5.4 3rd Qtr 8/31/2005 <10 3,100 <lb <10 NA 5.2 4th Qtr 12/7/2005 <50 2,500 <50 <50 52 5.3 ......... 1st Qtr 3/9/2006 <50 1900, <50 <50 48 1 2nd Qtr 6/14/2006 <50 2,200 <50 <50 47 4.5 3rd Qtr 7/20/2006 4th Qtr . . 11/8/2006
<50
1.5
2,140
2,160
<50
<1.0
<50
<1.0 51
49
4.7
4,6 1st Qtr 2/28/2007 1.1 1,830 <1.0 <1.0 47 6 gnd,Qtr 6/27/2007 1.5 2,600 <1.0 <1.0 45 5.1 3rd Qtr 8/15/2007 1.4 2,300 <1.0 <1.0 44 4,7 4th Qtr 10/10/2007 1.2 1,900 <1.0 <1.0 45 4.7 ist Qtr 3/28/2008 1.3 2,200 <1.0 •<1.0 43 .4. 2nd Qtr 6/25/2008 1.3 1,800 <1.6 <to 43 ,I, , 3rd Qtr 9/10/2008 1.4 1,600 <1.0 <1.0 35 4.16 4th Qtr 10/15/2008 NA NA NA NA 40 4.01 11/18/2008 <2.0 2,590 <2.0 <2.0 NA NA 1st Qtr 3/11/2009 1.2 1,860 <1.0 <1.0 35 3.7 2nd Qtr 6/23/2009 <1.0 1,400 <1.0 <1.0 37 3.8 3rd Qtr 9/14/2009 1 1,500 <1.0 <1.0 37 4.1 4th Qtr 12/29/2009 <1.0 1 300 <1.0 <1.0 37 4.2 1st Qtr 2/25/2010 <1.0 1,200 <1.0 <1.0 ,35 3.8 2nd Qtr 6/14/2010 <1.0 1,100 <1.0 <1.0 31 3.9 3rd Qtr 8/11/2010 1 „ 1,500 <1.0 <1.0 36 8.9 4th Qtr 10/15/2010 <1.0 1,100 <1.0 <1.0 38 4 1st Qtr 2/23/2011 <1.0 1,300 <1.0 <1.0 45 3.6 2nd Qtr 6/1/2011 <1.0 .„.., 1,200 <1.0 <1.0 35 4.0 3rd Qtr 8/18/2011 <1.0 1,200 <1.0 <1,0, , 37 4.1 4th Qtr 11/29/2011 <1.0 1 000 <1 0 <1.0 37 3.8 1st Qtr (1) 1/19/2012 <1.0 1 dim <1 0 <1.0 37 3.9 .2nd Qtr 6/14/2012 <1.0 790 <1.0 <1.0 41 4.0 3rd Qtr 9/13/2012 <1.0 870 <1.0 <1.0 40 3.8 4th Qtr 10/4/2012 <1.0 940 <1.0 <1.0 41 3.6 1st Qtr 2/13/2013 <1.0 940 <1.0 <1.0 37.7 3.51 2nd Qtr 6/18/2013 <1.0 953 <1.0 <1.0 39.3 4 3rd Qtr 9/12/2013 <1.0, 1,040 <1.0 <1.0 36.4 4.17 46.1.Otr_ 11/14/2013 <1.0 1 050 <1.0 <1.0 37.2 4.13 1st Qir 2/5/2014 5.41 946 <1.0 <1.0 38.2 4.24 2nd Qtr 5/22/2014 4.78 847 <1.0 <1.0 37.7 4.19 3rd Qtr 8/27/2014 <1.0 857 1.5 <1.0 39 2.9 4th Qtr 10/30/2014 <1 0 926 <1.0 <1.0 40 2 3.68 .1st Qtr (2) 3/18/2015 <1.0 942 <1.0 <1.0 40.4 4.2E 2nd Qtr 6/11/2015 <1.0 950 <1.0 <1.0 42.1 2.62 3rd Qtr 9/10/2015 <1.0 897 <1.0 <1.0 46.7 4.72 4th Qtr 10/29/2015 <1.0 847 <1.0 <1.0 40.6 3.49 1st Qtr 3/22/2016 <1.0 834 <1.0 <1.0 42.4, 4.43 2nd Qtr 6/8/2016 <1.0 909 <1.0 <1.0 44.1 3.75 3rd Qtr 8/4/2016 <1.0 1,000 <1.0 <1.0 42.3 4.21 4th Qtr 10/26/2016 <1.0 - 886 <1.0 <1.0 45.8 4.33 1st Qtr 3/21/2017 <1.0 986 <1.0 <1.0 40.5 3.87 2nd Qtr 6/21/2017 <1.0 968 <1.0 <1.0 43.3 4.15 3rd Qtr 8/4/2017 <1.0 1,070 <1.0 <1.0 44.7 4.20 4th Qtr, 10/11/2017 <1.0 884 <1.0 <1.0 43.7 4.35 DWMRCeplit sarnple <7.6 890 <12 17 J 42.0 4.30 1st Qtr 3/21/2018 <1.0 721 <1.0 <1.0 44.5 3.96 2nd Qtr 6/14/2018 <1.0 751 <1.0 <1.0 41.5 4.45 3rd Qtr 9/6/2018 <1.0 781 <1.0 <1.0 48.5 4.34 .. 4th Qtr 12/13/2018 <1.0 838 <1.0 <1.0 42.8 ........193.„ 1st Qtr 3/20/2019 <1.0 , 736 <1.0 . <1.0 41.3 4.01 2nd Qtr 6/19/2019 <1.0 862 <1.0 <1.0 43.0 4.19 3rd Qtr 9/12/2019 <1.0 801 <1.0 <1.0 39.6 3.76 4th Qtr 12/18/2019 <1.0 546 <1.0 <1.0 47.2 3.11 1st Qtr 3/18/2020 <1 0
----
746 <1.0 <1.0 42.1 3.75 2nd Qtr 6/12/2020 <1.0 864 <1.0 <1.0 44.1 4.06 Deplicate TW4-75 <1.0 871 <1.0 <1.0 43.1 4.19 3rd Qtr 9/19/2020 <1.0 971 <1.0 <1.0 41.5 3.87 11/As of March 2012 both north and south mid lifelonds no loraer receiving (22 chloroforruumku wells TW4-1 and TW4-2 started in 1/14/15 11A = not analyzed Shaded indicates concentrations exceeding GWQS. Bold and italics indicates the MDL exceeded the GWQS. J = Approximated value
TABLE 1 (11 of 31)
Historic Summary Of Monitoring Well Analytical Results Up To The 3rd Qarter 2020
Chloroform Contamination Investigation
DUSA White Mesa Mill
TW4-8
Sampling Event
Parameter
(GWQS)
Carbon Tetrachloride
(5 pg/L)
Chloroform
(70 pg/L)
Chloromethane
(30 pg/L)
Methylene Chloride
(5 pg/L)
Chloride
No GWQS (mg/L)
Nitrate, Nitrate + Nitrite
(10 mg/L)
1st Qtr 3/16/2005 NA 10 NA NA NA <0.1
2nd Qtr 5/25/2005 NA <1.0 NA NA NA 0.2
3rd Qtr 8/31/2005 <1.0 1.1 1.7 NA NA <1.0
4th Qtr 12/7/2005 <1.0 <1.0 <1.0 <1.0 41 <1.0
1st Qtr , 3/9/2006 <1.0 1.3 2.1 <1.0 39 0.3
2nd Qtr 6/14/2006 <1.0 1.8 1.0 <1.0 37 <1.0
3rd Qtr 7/20/2006 <1.0 <1.0 <1.6 <1.0 39 0.1
4th dtr 11/8/2006 <1.0 <1.0 <1.0 <1.0 40 <.1 lat Qtr 2/28/2007 <1.0 2.5 <1.0 <1.0 39 0.7 2nd Qtr 6/27/2007 <1.0 2.5 <1.0 <1.0 42 0.2 3rd Qtr 8/15/2007, <1.6 1.5 <1.0 <1.0 42 <1.0 4th Qtr 10/10/2007 <1.6 3.5 <1.0 <1.0 43 0.5 1st Qtr 3/28/2008 <1.0 <1.0 <1.0 <1.0 46 • 0.1 2nd Qtr 6/25/2008 <1.0 <1.0 <1.0 <1.0 45 01.0 3rd Qtr 9/10/2008 <1.0 <1.0 <1.0 <1.6 39 <0.05
4th Qtr 10/15/2008 <1.0 <1.0 <1.0 <1.0 44 <0.05
1st Qtr 3/4/2009 <1.0 <1.0 <1.0 <1.0 42 <0.1
2nd Qtr 6/23/2009 <1.0 <1.0 <1.0 <1.0 44 <0.1
3rd Qtr 9/14/2009 <1.0 <1.0 ,<1.0 <1.0 44 <0.1
4th Qtr 12/17/2009 <1.0 <1.0 <1.0 <1.0 51 <0.1
1st Qtr 2/24/2010 <1.0 <1.0 <1.0 <1.0 57 <0.1
2nd Qtr 6/14/2010 <1.0 <1.0 <1.0 <1.0 42 <0.1
3rd Qtr 8/18/2010 <1.0 <1.0 <1.0 <1.0 45 <0.1
4th Qtr 10/15/2010 <1.0 <1.0 <1.0 <1.0 46 0.1
1st Qtr 2/16/2011 <1.0 <1.0 <1.0 <1.0 52 <0.1
2nd Qtr 5/25/2011 <1.0 <1.0 <1.0 <1.0 45 0.1
3rd Qtr 8/16/2011 <1.0 <1.0 <1;0 <1.0 46 0.1 4th Qtr 11/16/2011 45 0.2
. (1) 12/7/2011 <1.0 <1.0 <1.0 <1.0 NA NA lif0613) 1/18/2012 <1.0 <1.0 <1.0 <1.0 45 0.3 i.2nd Qtr 5/13/2012 <1.0 -<1.0 <1.0 <1.0 44 0.2
3rd Qtr 8/29/2012 <1.0 <1 0 . . „ <1,.0 <1.0 48 0.1
4th Qtr 10/3/2012 <1.0 <1.0 <1.0 <1.0 47 <0.1
1st Qtr 2/7/2013 <1.0 <1.0 <1.0 <1.0 46,6 „ 0.41. 2nd Qtr 5/30/2013 <1.0 <1.0 <1.0 <1.0 45.5 <0.1 „. 3rd Qtr i 9/5/2013 <1.0 <1,0 <ill) <1.6 47.5 0.1
11/7/2013 <1.0 <1.0 <1 0 <1.0 46 1 <0 1
1st Qtr 1/23/2014 <1.0 63.8 <1.0 <1.0 48.5 0.166
, (2), , , 2/6/2014 <1.0 100 <1.0 <1.0 46.5 0.166
2nd Qtr ,5/22/2014 <1.0 122 <1.0 <1.0 53 0.538
3rd Qtr 8/27/2014 <1.0 107 <1.0 <1.0 47 0.6
4th Qtr 10/29/2014 <1.0 191 <1.0 <1.0 46 7 0.914
'1 st Qtr (4) 3/12/2015 <1.0 961 <1.0 <1.0 49.6 2.S
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 <1 0 52 2.2
1st Qtr 3/17/2016 <1.0 634 <1.0, <1.0 54.2 2.48
2nd Qtr 6/8/2016 <1.0 595 <1.6 <1.0 58.7 2.14
3rd Qtr 8/4/2016 <1.0 522 <1.0 <1.0 56.9 2.10
4th Qtr 10/27/2016 <1.0 472 <1.0 <1.0 60.1 2:16 lst Qtr 3/21/2017 <1.0 359 <1.0 <1.0 57.4 2.06
2nd Qtr 6/21/2017 <1.0 256 <1.0 <1.0 58.8 1.97
3rd Qtr 8/4/2017 <1.0 223 <1.0 <1.0 61.2 1.64
4th Qtr 10i11/2017 <1.0 214 <1.0 <1.0 52.2 1.92
Deplicate TW4-75 <1.0 194 1.12 <1.0 56.2 1.71
DWMRC g!ljtatitply.. <1.9 230 4.7 J <3.0 61 1.90 1st Qtr 3/21/2018 <1.0 220 <1.0 <1.0 60.8 1.36
Deplicate TW4-75 <1.i0 171 <1.0 <1.0 60.8 1.36
2nd Qtr 6/14/2018 <110 155 <1.0 <1.0 53.8 1.31
3rd Qtr 9/5/2018 <1.0 137 <1.0 <1.0 63.2 1.40
4th Qtr 12/13/2018 <1.0 93.8 <1.0 <1.0 53.1 1.35
1st Qtr 3/19/2019 <1.0 103 <1.0 <1.0 54.3 1.23
2nd Qtr 6/19/2019 <1.0 96 <1.0 <1.0 56.5 1.1
3rd Qtr 9/12/2019 <1.0 75.4 <1.0 <1.0 52 0.999
Deplicate TW4-75 <1.0 75.6 <1.0 <1.0 52.5 1.030 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
2n0 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
(1) VOCs were resampled because laboratory missed holding time.
(2) Resampled to verify chlorofo in concentration that was collected on 1/23/14. .S31As of March 2012 both north and south wild life2onds no lon.ger receivinevater.
(4) chloroform purnpir2 wells TW4-1 and TW4-2 started in 1/14/15
NA = not analyzed
Shaded indicates concentrations exceeding GWQS.
J = Approximated value
TABLE 1 (12 of 31)
Historic Summary Of Monitoring Well Analytical Results Up To The 3rd Qarter 2020
Chloroform Contamination Investigation
DUSA White Mesa Mill
TW4-9 Sampling Event Parameter
(GWQS)
Carbon Tetrachloride
(5 pg/L)
Chloroform
(70 pg/L)
Chloromethane
(30 pg/L)
Methylene Chloride
(5 pg/L)
Chloride
No GWQS (mg/L)
Nitrate, Nitrate + Nitrite
(10 mg/L) 1st Qtr 3/16/2005 NA 3.8 NA NA NA 1.3 2nd Qtr 5/25/2005 NA 1.2 NA NA NA 1.3 3rd Qtr 8/31/2005 <1.0 <1.0 2.9 <1.0 NA 1.3 4th Qtr 12/7/2005 <1.0 <1.0 <1.0 <1.0 42 1.3 1st Qtr 3/9/2006 <1.0 <1.0 2.6 <1.0 38 1.5 2nd Qtr 6/14/2006 <1.0 19 2.7 <1.0 39 1.5 3rd Qtr 7/20/2006 <1.0 <1.0 <1.0 <1.0 41 0.9 4th Qtr 11/8/2006 <1.0 <1.0 <1.0 <1.0 44 0.7
1st Qtr 2/28/2007 <1,0 <1.0 <1.0 <1.0 44 0.6
2nd Qtr 6/27/2007 <1.0 21 <1.0 <1.0 42 1.3
3rd Qtr 8/15/2007 <1.0 9.5 <1.0 <1.0 38 1.8
4th Qtr 10/10/2007 <1.0 8.7 <1.0 <1.0 40 2 1st Qtr 3/28/2008 <1.0 1.3 <1.0 <1.0 35 2.1 2nd Qtr 6/25/2008 <1.0 1 <1.0 <1.0 35 2.3
3rd Qtr 9/10/2008 <1.0 <1.0 <1.0 <1.0 28 2.79 4th Qtr 10/15/2008 <1.0 <1.0 <1.0 <1.0 58 1.99 1st Qtr 3/4/2009 <1.0 <1.0 <1.0 <1.0 30 2.5 2nd Qtr 6/23/2009 <1.0 <1.0 <1.0 <1.0 30 2.3 3rd Qtr 9/14/2009 <1.0 <1.0 <1.0 <1.0 30 2.5 4th Qtr 12/17/2009 <1.0 <1.0 <1.0 <1.0 37 11 ist Qtr 2/23/2010 <1.0 <1.0 <1.0 <1.0 47 ---1:4 2nd Qtr 6/14/2010 <1.0 <1.0 <1.0 <1.0 33 1.5 3rd Qtr 8/13/2010 <1.0 <1.0 <1.0 <1.0 40 1.2 41h Qtr 10/15/2010 <1.0 <1.0 <1.0 <1.0 34 1.8 1st Qtr 2/17/2011 <1.0 <1.0 <1.0 <1.0 41 1.3
2nd Qtr 5/25/2011 <1.0 <1.0 <1.0 <1.0 38 3.4
3rd Qtr 8/16/2011 <1.0 <1.0 <1.0 <1.0 21 4
4th Qtr 11/16/2011 NA NA NA NA 38 2.3
(1) 12/7/2011 <1.0 <1.0 <1.0 <1.0 NA .. Tif air a) 1/18/2012 <1.0 <1.0 <1.0 <1.0 28 2.3 -2nd Qtr 5/31/2012 <1.0 <1.0 <1.0 <1.0 23 4.15 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
41h Qtr 11/7/2013 <1.0 <1.0 <1.0 <1.0 23.6 4.87
1st Qtr 1/29/2014 <1.0 <1.0 <1.0 <1.0 22 4.36
2nd Qtr 5/22/2014 <1.0 6.9 <1.0 <1.0 24 3.44
3rd Qtr 8/14/2014 <1.0 47 <1.0 <1.0 27 2.7 416 Qtr 10/29/2014 <1.0 101 <1.0 <1.0 25 4.29 1st Qtr 3/12/2015 <1.0 53.5 <1.0 <1.0 29.5 3.28 2nd Qtr 6/11/2015 <1.0 35.1 <1.0 <1.0 35.3 1.83 3rd Qtr 9/3/2015 <1.0 48 <1.0 <1.0 39.3 1.44 4th Qtr 10/28/2015 <1.0 68.4 <1.0 <1.0 29.2 2.89 1st Qtr 3/17/2016 <1.0 74.3 <1.0 <1.0 33.6 2.51
2nd Qtr 6/8/2016 <1.0 76.2 <1.0 <1.0 35.1 2.16
3rd Qtr 8/3/2016 <1.0 76.8 <1.0 <1.0 33.6 2.11
4th Qtr 10/26/2016 <1.0 76.0 <1.0 <1.0 37.4 2.24
1st Qtr 3/17/2017 <1.0 113 <1.0 <1.0 34.5 2.18
2nd Qtr 6/21/2017 <1.0 113 <1.0 <1.0 35.9 1.92
3rd Qtr 8/3/2017 <1.0 118 <1.0 <1.0 37 1.90
4th Qtr 10/11/2017 <1.0 132 <1.0 <1.0 32 2.18 DWMRCspirt.sampls <0.98 120 <1.5 1.6 J 35 2.20 1st Qtr 6/21/2018 <1.0 159 <1.0 <1.0 38.3 1.85 2nd Qtr 6/4/2018 <1.0 134 <1.0 <1.0 35.7 1.85 Deplicate TW4-75 <1.0 132 <1.0 <1.0 35.2 1.91 3rd Qtr 9/5/2018 <1.0 94.2 <1.0 <1.0 43.4 1.04 Deplicate TW4-75 <1.0 92.4 <1.0 <1.0 42.7 1.11
4gi..Qtr..........._....1v4Pg21§ 511. ...... 109 <1.0 <1.0 36.3 1.23 lsi di 6/19/2019 <1.0 86.4 <1.0 <1.0 36.9 1.09
2nd Qtr 6/19/2019 <1.0 68.1 <1.0 <1.0 38.3 0.785
3rd Qtr 9/11/2019 <1.0 66 0 <1.0 <1.0 35.2 0.904
4th Qtr 12/18/2019 <1.0 54.8 <1.0 <1.0 40.1 0.744
1st Qtr 3/18/2020 <1.0 48.9 <1.0 <1.0 37.7 0.855
2nd Qtr 6/12/2020 <1.0 55.1 <1.0 <1.0 39.5 0.990 Deplicate TW4-70 <1.0 56.4 <1.0 <1.0 39.6 1.010 3rd Qtr 9/18/2020 <1.0 45.0 <1.0 <1.0 36.7 0.867
(1) VOCs were resarnpled because laboratory missed holding time. (2) As of Mar.; , ,„ n „nil and south wild life ponds no lorler receivinuater NA = not analyzed Shaded indicates concentrations exceeding GWQS. J = Approximate value
TABLE 1 (13 of 31) Historic Summary Of Monitoring Well Analytical Results Up To The 3rd Qarter 2020 Chloroform Contamination Investigation
DUSA White Mesa Mill
TW4-10
Sampling Event
Parameter
(GWQS) Carbon Tetrachloride
(5 pg/L)
Chloroform
(70 pg/L) Chloromethane (30 pg/L) Methylene Chloride
(5 pg/L)
Chloride
No GWQS (mg/L)
Nitrate, Nitrate + Nitrite
(10 mg/L)
1st Qtr 3/16/2005 NA 140 NA NA NA 1.6 2nd Qtr 5/25/2005 NA 62 NA NA NA 0.8 3rd Qtr 8/31/2005 <2.5 110 6.2 <2.5 NA 1.1 4th Qtr 12/7/2005 <2.5 300 <2.5 <2.5 52 3.3 1st Qtr 3/9/2006 <5.0 190 <5.0 <5.0 50 14 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 Qtr 10/10/2007 <1.0 470 <1.0 59 6.7 1st Qtr 3/28/2008 <1.0 620 <1.0 <1.0 55 7.3 2nd Qtr 6/25/2008 <1.0 720 <1.0 <1.0 58 9.9 3rd Qtr 9/10/2008 <1.0 660 <1.0 <1.0 51 9.23 4th Qtr 10/15/2008 NA NA NA NA 61 10.5 11/18/2008 <2.0 1200 <2.0 <2.0 NA NA 1st Qtr 3/11/2009 <1.0 1,100 <1.0 <1.0 64 11.6 2nd Qtr 6/23/2009 <1.0 1,200 <1.0 <1.0 62 9.8 3rd Qtr 9/14/2009 <1.0 910 <1.0 <1.0 51 8.1 4th Qtr 12/22/2009 <1.0 300 <1.0 <1.0 51 ..,?;j lst Qtr 3/3/2010 <1.0 460 <1.0 <1.0 46 5.6 2nd Qtr 6/14/2010 <1.0 220 <1.0 <1.0 42 1.6 3rd Qtr 8/12/2010 <1.0 100 <1.0 <1.0 38 0.8 4th Qtr 10/15/2010 <1 0 1190 <1.0 <1.0 52 .....___ _ ...110 l st Qtr 2/23/2011 <1.0 620 <1.0 <1.0 32 9.6 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 0 110 <1.0 <1.0 45 1.1 -111.Cga() 1/19/2012 <1.0 76 <1.0 <1.0 46 -6:9
2nd Qtr 6/14/2012 <1.0 79 <1.0 <1.0 46 0.6 3rd Qtr 9/12/2012 <1.0 130 <1.0 <1.0 44 1.0 4th Qtr 10/3/2012 <1.0 140 <1.0 <1.0 45 1.6 ......... 1st Qtr 2/13/2013 <1.0 154 <1.0 <1.0 49.1 1.2 2nd Qtr 6/13/2013 <1.0 486 <1.0 <1.0 51.5 5.6 3rd Qtr 9/12/2013 <1.0 1,126 <1.0 <1.0 67.9 13.0 4th Qtr 11/14/2013 <1.0 1,380 <1.0 <1.0 70.9 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 4th Qtr 10/30/2014 <1.0 1220 <1.0 <1.0 75.2 13.2 1st Qtr 3/18/2015 <1.0 1,210 <1.0 <1.0 78.6 15.0 2nd Qtr 6/11/2015 <1.0 1,240 <1.0 <1.0 75 11.4 3rd Qtr 9/10/2015 <1.0 1,280 <1.0 <1.0 89.5 14.0 4th Qtr 10/29/2015 <1.0 1 350 <1.0 <1.0 79.9 13.5 1st Qtr 3/22/2016 <1.0 1,430 <1.0 <1.0 84.1 17.3 2nd Qtr 6/8/2016 <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 4th Qtr 10/26/2016 <1.0 1 290 <1.0 <1.0 84.4 14.8 1st Qtr 3/21/2017 <1.0 1,260 <1.0 <1.0 74.6 13.0 2nd Qtr 6/21/2017 <1.0 1,140 <1.0 <1.0 73.1 13.0 3rd Qtr 8/4/2017 <1.0 1,320 <1.0 <1.0 77 13.4 4th Qtr 10/11/2017 <1.0 1,150 <1.0 <1.0 70 12.9
ovonRc.ANq saing.t <9.5 1,100 <15 16 J 76 13.0 1st Qtr 3/2.1/2018 <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 4th Qtr 12/13/2018 <1.0 1,670 <1.0 <1.0 63.5 _10,6
. 1st Qtr 3/20/2019 <1.0 869 <1.0 <1.0 59.3 9.34 2nd Qtr 6/19/2019 <1.0 799 <1.0 <1.0 58.7 8.86 3rd Qtr 9/12/2019 <1.0 734 <1.0 <1.0 55.8 7.79 4th Qtr 12/18/2019 <1.0 768 <1.0 <1.0 62 6.89 1st Qtr 3/18/2020 <1.0 • 798 <1.0 <1.0 53.5 7.83 2nd Qtr 6/11/2020 <1.0 928 <1.0 <1.0 60.1 8.13 3rd Qtr 9/19/2020 <1.0 854 <1.0 <1.0 53.9 7.34
,f March 2012 both north and south wild lifezinds no lonler recelving water.
NA = not analyzed Shaded indicates concentrations exceeding GWQS. J = Approximate value
TABLE 1 (14 of 31)
Historic Summary Of Monitoring Well Analytical Results Up To The 3rd Qarter 2020 Chloroform Contamination Investigation
DUSA White Mesa Mill
TW4-11(chloroform purnong well started 1/14/15)
Sampling Event
Parameter
(GWQS) Carbon Tetrachloride
(5 pg/L)
Chloroform
(70 pg/L) Chloromethane (30 pg/L) Methylene Chloride
(5 pg/L)
Chloride
No GWQS (mg/L)
Nitrate, Nitrate + Nitrite
(10 mg/L) 1st Qtr 3/16/2005 NA 4,400 NA NA NA 8.7 2nd Qtr 5/25/2005 NA 3,590 NA NA NA 10.3 3rd Qtr 8/31/2005 <10 4,400 <10 <10 NA 9.4 4th Qtr 12/7/2005 <100 4,400 <100 <100 58 9.4 1st Qtr 3/9/2006 <50 4,400 <50 <50 56 9.2 2nd Qtr 6/14/2006 <50 4,300 <50 <50 56 10.0 3rd Qtr 7/20/2006 <50 4,080 <50 <50 55 10 0 4th Qtr 11/8/2006 1.7 .3,660 2.7 1.3 55 10.0 1st Qtr 2/28/2007 1.3 8,600 <1.0 1.6 54 10.1 2nd Qtr 6/27/2007 1.6 3,800 <1.0 <1.0 53 10.6 3rd Qtr 8/15/2007 1.7 4,500 <1.0 <1.0 53 10.2 4th Qtr 10/10/2007 1.6 4 400 <1 0 1.2 53 9.8 1st Qtr 3/28/2008 <1.0 340 <1.0 <1.0 63 7.7 2nd Qtr 6/25/2008 <1.0 640 <1.0 <1.0 46 7.3 3rd Qtr 9/10/2008 <1.0 900 <1.0 <1.0 42 7.9 4th Qtr 10/15/2008 NA NA NA NA 47 9.5 11/18/2008 <2.0 1,000 <2.0 <2.0 NA NA 1st Qtr 3/11/2009 <1.0 1,000 <1.0 <1.0 49 7.3 2nd Qtr 6/23/2009 <1.0 980 <1.0 <1.0 44 6.8 3rd Qtr 9/14/2009 <1.0 1,000 <1.0 <1.0 49 7.0 4th Qtr 12/22/2009 <1.0 860 <1.0 <1.0 46 6.6 1st Qtr 3/3/2010 <1.0 820 <1.0 <1.0 42 6.8 2nd Qtr 6/14/2010 <1.0 820 <1.0 <1.0 40 6.9 3rd Qtr 8/12/2010 <1.0 800 <1.0 <1.0 43 6.7 4th Qtr 10/15/2010 <1.0 720 <1.0 <1.0 49 6.4 1st Qtr 2/23/2011 <1.0 1,000 <1.0 <1.0 46 6.5 2nd Qtr 6/1/2011 <1.0 930 <1.0 <1.0 49 7.3 3rd Qtr 8/17/2011 <1.0 820 <1.0 <1.0 48 7.1 4th Qtr 11/16/2011 <1.0 1500 <1.0 <1.0 46 7.1 lit- Ofr (II 1/24/2012 <1.0 610 <1.0 <1.0 43 6.8 2nd Qtr 6/13/2012 <1.0 660 <1.0 <1.0 52 6.f 3rd Qtr 9/13/2012 <1.0 740 <1.0 <1.0 49 3.0 4th Qtr 10/3/2012 <1.0 730 <1.0 <1.0 50 7.0 1st Qtr 2/13/2013 3.23 867 <1.0 <1.0 47.3 6.8 2nd Qtr 6/18/2013 <1.0 788 <1.0 <1.0 49.3 7.4 3rd Qtr 9/12/2013 <1.0 865 <1.0 <1.0 46.6 7.8 4th Qtr 11/13/2013 <1.0 874 <1.0 <1.0 46.7 8.01 1st Qtr 2/5/2014 5.19 785 <1.0 <1.0 48.5 8.47 2nd Qtr 5/23/2014 <1.0 751 <1.0 <1.0 51.6 6.92 3rd Qtr 8/27/2014 <1.0 719 1.2 <1.0 48 5.4 4th Qtr 10/29/2014 <1 0 803 <1.0 <1 0 56 4 7 33 1st Qtr(2) 3/9/2015 1.24 2,450 <1.0 <1.0 49.8 8.7i 2nd Qtr 6/11/2015 <1.0 2,710 <1.0 <1.0 62.2 8.48 3rd Qtr 8/31/2015 <1.0 1,120 <1.0 <1.0 73.1 9.61 4th Qtr 10/29/2015 <1.0 2 730 <1.0 <1.0 55.3 7.5 1st Qtr 3/9/2016 1.2 2,660 <1.0 <1.0 55.5 7.13 2nd Qtr 5/23/2016 2.19 3,340 <1.0 <1.0 56.4 7.81 3rd Qtr 7/25/2016 <1.0 3,200 <1.0 <1.0 55.3 8.83 4th Qtr 10/12/2016 <1.0 3 200 <1.0 <1.0 57.2 .§,?? 1st Qtr 3/8/2017 1.71 3,310 <1.0 <1.0 49.8 8.1 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 4y1c4r_.... 10/11/2017 1.48 2,880 <1.0 <1.0 49.7 7.79 OwMRC Ki.A.prep.19... <38 ...2,0.00, <60 140 .1 52 8.0 1st Qtr 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 3rd Qtr 8/22/2018 1.47 3,050 <1.0 <1.0 53.3 7.15 4th Qtr 11/28/2018 1.33 2930 <1.0 <1.0 45.4 .6.23. lst Qtr 3/8/2019 1.48 2,820 <1.0 <1.0 46.8 7.50 2nd Qtr 6/5/2019 1.52 2,970 1.4 <1.0 45.3 8-30 3rd Qtr 9/4/2019 1.47 2,790 <1.0 <1.0 48.8 7.15 4th Qtr 12/18/2019 <1.0 3,250 <1.0 <1.0 49.0 7,14 1st Qtr 2/19/2020 <1.0 2,990 <1.0 <1.0 51.9 7.67 2nd Qtr 5/11/2020 1.37 2,810 <1.0 <1.0 48.6 7.56 3rd Qtr 9/4/2020 1.47 3 070 <1.0 <1.0 46.3 7.59
(1) As of March 2012 both north and south wild lifesonds no longer receiving water. jaChloroformjum25 well started 1/14/15. NA = not analyzed Bold and italics indicates the MDL exceeded the GWQS. Bold and italics indicates the MDL exceeded the GWQS. J = Approximated value
TABLE 1 (15 of 31) Historic Summary Of Monitoring Well Analytical Results Up To The 3rd garter 2020 Chloroform Contamination Investigation
DUSA White Mesa Mill
TW4-12
Sampling Event
Parameter
(GWQS) Carbon Tetrachloride
(5 pg/L)
Chloroform
(70 pg/L)
Chloromethane
(30 pg/L)
Methylene Chloride
(5 pg/L)
Chloride
No GWQS (mg/L)
Nitrate, Nitrate + Nitrite
(10 mg/L)
1st Qtr 3/16/2005 NA <1.0 NA NA NA 1.4
2nd Qtr 5/25/2005 NA <1.0 NA NA NA 1.6 3rd Qtr 8/31/2005 <1.0 <1.0 5.8 <1.0 NA 1.5 4th Qtr 12/7/2005 <1.0 <1.0 1.0 <1.0 19 1.4 1st Qtr 3/9/2006 <1.0 <1.0 2.6 <1.0 19 1.3 2nd Qtr 6/14/2006 <1.0 <1.0 1.4 <1.0 16 1.4 3rd Qtr 7/20/2006 <1.0 <1.0 1.4 <1.0 16 1.4 4th Qtr 11/8/2006 <1.0 <1.0 <1.0 <1.0 16 1.4 1st Qtr 2/28/2007 <1.0 <1.0 <1.0 <1.0 16 1.5 2nd Qtr 6/27/2007 <1.0 <1.0 <1.0 <1.0 18 1.5 3rd Qtr 8/15/2007 <1.0 <1.0 <1.0 <1.0 29 1.4 4th Qtr 10/10/2007 <1.0 <1.0 <1.0 <1.0 16 1.4 1st Qtr 3/28/2008 <1.0 <1.0 <1.0 <1.0 16 1.6 2nd Qtr 6/25/2008 <1.0 <1.0 <1.0 <1.0 19 2.7 3rd Qtr 9/10/2008 <1.0 <1.0 <1.0 <1.0 18 2.7
4trt,Qtr,,,,.,.... 10/15/2008 <1.0 <1.0 <1.0 <1.0 22 2.5 iSt Qir 3/11/2009 <1.0 <1.0 <1.0 <1.0 23 2.4
2nd Qtr 6/23/2009 <1.0 <1.0 <1.0 <1.0 22 3.8
3rd Qtr 9/14/2009 <1.0 <1.0 <1.0 <1.0 22 5.1
4th Car 12/16/2009 <1.0 <1.0 <1.0 <1.0 23 3.6
1st Qtr 2/23/2010 <1.0 <1.0 <1.0 <1.0 22 4.0
2nd Qtr 6/14/2010 <1.0 <1.0 <1.0 <1.0 29 11.0
3rd Qtr 8/10/2010 <1.0 <1.0 <1.0 <1.0 35 9.0
4th Qtr 10/15/2010 <1.0 <1.0 <1.0 <1.0 31 8.0
1st Qtr 2/15/2011 <1.0 <1.0 <1.0 <1.0 31 6.5 2nd Qtr 5/25/2011 <1.0 <1.0 <1.0 <1.0 32 7.0 3rd Qtr 8/16/2011 <1.0 <1.0 <1.0 <1.0 31 6.8 4th Qtr 11/15/2011 <1.0 <1.0 <1.0 <1.0 30 8.0 Tat latiT1I 1/(7/2012 <1.0 <1.0 <1.0 <1.0 28 7.7
'2nd Qtr 5/31/2012 <1.0 <1.0 <1.0 <1.0 34 10.0
3rd Qtr 8/29/2012 <1.0 <1.0 <1.0 <1.0 39 13.0 • 4th Qtr 10/3/2012 <1.0 <1.0 <1.0 <1.0 39 0. _ ......1.3.i 1st Qtr 2/13/2013 <1.0 <1.0 <1.0 <1.0 36.7 1 id 2nd Qtr 5/29/2013 <1.0 <1.0 <1.0 <1.0 38.6 14.2 • 3rd Qtr 8/29/2013 <1.0 <1.0 <1.0 <1.0 41.7 17.4 4th Qtr 11/6/2013 <1.0 <1.0 <1.0 <1.0 41.4 16.4 1st Qtr 1/22/2014 <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 10/23/2014 <1.0 <1.0 <1.0 <1.0 50 2 16.1
1st Qtr 3/11/2015 <1.0 <1.0 <1.0 <1.0 50.6 19.2
2nd Qtr 6/10/2015 <1.0 <1.0 <1.0 <1.0 56 18.8
3rd Qtr 9/2/2015 <1.0 <1.0 <1.0 <1.0 60.2 16.4
4th Qtr 10/21/2015 <1.0 <1.0 <1.0 <1.0 51 18.0
I?_plicate TW4-65 <1 0 <1 0 <1.0 <1 0 51 3 18.0 -1st Qtr 3/15/2016 <1.0 <1.0 <1.0 <1.0 56.2 34.8 2nd Qtr 5/25/2016 <1.0 <1.0 <1.0 <1.0 66.4 30.7 Deplicate TW4-65 <1.0 <1.0 <1.0 <1.0 67 113.0 3rd Qtr 7/27/2016 <1.0 <1.0 <1.0 <1.0 67.5 37.7 4th Qtr 10/12/2016 1st Qtr 3/14/2017 <1.0 <1.0 <1.0 <1.0
<1.0
<1.0 <1.0 <1.0 .....1.,.. 62.6 .....2511 25.9; 2nd Qtr 6/14/2017 <1.0 1.25 <1.0 <1.0 67.2 29.9 3rd Qtr 8/2/2017 <1.0 1.2 <1.0 <1.0 65.3 25.1
Deplicate TW4-70 <1.0 1.19 <1.0 <1.0 67 26.7
4th Qtr 10/10/2017 <1.0 <1.0 <1.0 <1.0 56.2 26.9
paplicate TYV4-70 <1.0 <1.0 <1.0 <1.0 61.4 26.8
ist Qtr 3/14/2018 <1.0 <1.0 <1.0 <1.0 59.5 19.8
2nd Qtr 6/12/2018 <1.0 <1.0 <1.0 <1.0 53.6 18.4
3rd Qtr 8/29/2018 <1.0 <1.0 <1.0 <1.0 59.9 13.6
4th Qtr 11/30/2018 <1.0 <1.0 <1.0 <1.0 56.1 10.4
1st Qtr 3/16/2019 <1.0 <1.0 <1.0 <1.0 50.8 10.1
2nd Qtr 6/13/2019 <1.0 <1.0 <1.0 <1.0 55.3 8.31 3rd Qtr 9/11/2019 <1.0 <1.0 <1.0 <1.0 52.6 8.88 4th Qtr 12/14/2019 <1.0 <1.0 <1.0 <1.0 58.0 9:94 1st Qtr 3/17/2020 <1.0 <1.0 <1.0 <1.0 53.0 6.36 2nd Qtr 6/11/2020 <1.0 <1.0 <1.0 <1.0 51.7 4.95
3rd Qtr 9/17/2020 <1.0 <1.0 <1 0 <1.0 50.3 2 34
(1) As of March 2012 b h north and south wild life ponds no longer receiving er
NA = not analyzed
Shaded indicates concentrations exceeding GWCIS.
TABLE 1 (16 of 31)
Historic Summary Of Monitoring Well Analytical Results Up To The 3rd Qarter 2020 Chloroform Contamination Investigation
DUSA White Mesa Mill
TW4-13 Sampling Event Parameter
(GWQS)
Carbon Tetrachloride
(5 pg/L)
Chloroform
(70 pg/L)
Chloromethane
(30 pg/L)
Methylene Chloride
(5 pg/L)
Chloride
No GWQS (mg/L) Nitrate, Nitrate + Nitrite (10 mg/L) 1st Qtr 3/16/2005 NA <1 0 NA NA NA 4 2 2nd Qtr 5/25/2005 NA <1 0 NA NA NA 4 3 3rd Qtr 8/31/2005 <1 0 <1 0 3 1 <1 0 NA 4 6 4th Qtr 12/7/2005 <1 0 <1 0 <1 0 <1 0 69 4 3 1st Qtr 3/9/2006 <1 0 <1 0 1 7 <1 0 67 4 2 2nd Qtr 6/14/2006 <1 0 <1 0 1 4 <1 0 66 4 9 3rd Qtr 7/20/2006 <1 0 <1 0 <1 0 <1 0 65 4 3 4th Qtr 11/8/2006 .<1 0 <1 0 <1 0 <1 0 33 • 0 8 1st Qtr 2/28/2007 <1 0 <1 0 <1 0 <1 0 59 4 0 2nd Qtr 6/27/2007 <1 0 <1 0 <1 0 <1 0 59 4 6
3rd Qtr 8/15/2007 <1 0 <1 0 <1 0 <1 0 58 4 4 4th Qtr 10/10/2007 .<1 0 <1 0 <1 0 .<1 0 58 4 1 1st Qtr 3/28/2008 <1 b <1 0 <1 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 4th Qtr 10/15/2008 <1 0 <1 0 <1 0 <1 0 58 4 6 1st Qtr 3/4/2009 <1 0 <1 0 <1 0 <1 0 58 3 7 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 12/16/2009 <1 0 <1 0 <1 0 <1 0 60 4 1 1st Qtr 2/24/2010 <1 0 <1 0 <1 0 <1 0 53 4 3 2nd Qtr 6/14/2010 <1 0 <1 0 <1 0 <1 0 53 5 2 3rd Qtr 8/10/2010 <1 0 <1 0 <1 0 <1 0 55 5 6 4th Qtr 10/15/2010 <1 0 <1 0 - <1 0 <1 0 55. 5 8 1st Qtr 2/15/2011 <1 0 <1 0 <1 0 <1 0 60 5 6 2nd Qtr 5/25/2011 <1 0 <1 0 <1 0 <1 0 56 6 4 3rd Qtr 8/16/2011 <1 0 <1 0 <1 0 <1 0 60 5 2 4th Qtr 11/15/2011 <1 0 <1 0 <1 0 <1 0 54 5 9 ist Otr (1) 1/17/12 <1 0 <1 0 <1 0 <1 0 55 5 5
2nd Qtr 5/31/2012 <1 0 <1 0 <1 0 <1 0 59 6 ð 3rd Qtr 8/29/2012 <1 0 <1 0 <1 0 <1 0 60 6 2 4th Qtr 10/3/2012 <1 0 <1 0 <1 0 <1 0 60 5 9 1st Qtr 2/13/2013 <1 0 <1 0 <1 0 <1 0 59 3 6 31 2nd Qtr 5/29/2013 <1 0 <1 0 <1 0 <1 0 56 6 8 3rd Qtr 8/29/2013 <1 0 <1 0 <1 0 <1 0 63 5 7 16 4th Qtr 11/6/2013 <1 0 <1 0 <1 0 <1 0 58 5 6 48 1st Qtr 1/22/2014 <1 0 <1 0 <1 0 <1 0 63 1 7 09 2nd Qtr 5/21/2014 <1 0 <1 0 <1 0 <1 0 56 1 5 99 3rd Qtr 8/23/2014 <1 0 <1 0 <1 0 <1 0 62 4 8 4th Qtr. 10/23/2014 <1 0 <1 0 <1 0 <1 0 66 1 6 28
1st Qtr 3/11/2015 <1 0 <1 0 <1 0 <1 0 66 4 7 09
2nd Qtr 6/10/2015 <1 0 <1 0 <1 0 <1 0 70 3 6 32 3rd Qtr 9/2/2015 <1 0 <1 0 <1 0 <1 0 76 5 5 7 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 0 .<1 <1 0 <1 0 <1 0 70 9 6 20 1st Qtr 3/16/2017 <1 0 <1 0 <1 0 <1 0 66 0 6 05
2nd Qtr 6/15/2017 <1 0 <1 0 <1 0 <1 0 70 4 6 49
3rd Qtr 8/2/2017 <1 0 <1 0 <1 0 <1 0 70 5 6 15
4th Qtr 10/10/2017 .<1 0 <1 0 <1 0 <1 0 60 9. 6 17
1st Qtr 3/14/2018 <1 0 <1 0 <1 0 <1 0 71 0 5 76
2nd Qtr 6/12/2018 <1 0 <1 0 <1 0 <1 0 65 0 6 24
3rd Qtr 8/29/2018 <1 0 <1 0 <1 0 <1 0 73 7 5 13
4th Qtr 11/30/2018 .<1 0 <1 0 <1 0 <1 0 64 5 5 29 1st Qtr 3/16/2019 <1 0 <1 0 <1 0 <1 0 61 6 5 74 2nd Qtr 6/13/2019 <1 0 <1 0 <1 0 <1 0 65 4 6 56 3rd Qtr 9/11/2019 <1 0 <1 0 <1 0 <1 0 65 3 5 19 4th Qtr 12/14/2019 0 .<1 <1 0 <1 0 <1 0 68 7 5 17 1st Qtr 3/1-7/2020 <1 0 <1 0 <1 0 <1 0 63 9 5 5 2nd Qtr 6/11/2020 <1 0 <1 0 <1 0 <1 0 62 7 9 0 3rd Qtr 9/17/2020 <1 0 <1 0 <1 0 <1 0 60 2 5 25
(1) As of March 2012 both nodh and south wild Inelonds no lonier recenring water NA = not analyzed Shaded indicates concentrations exceeding GWQS
TABLE 1 (17 of 31)
Historic Summary Of Monitoring Well Analytical Results Up To The 3rd Qarter 2020
Chloroform Contamination Investigation
DUSA White Mesa Mill
1W4-14
Sampling Event Parameter
(GWQS)
Carbon Tetrachloride
(5 pg/L)
Chloroform
(70 pg/L)
Chloromethane
(30 pg/L)
Methylene Chloride
(6 pg/L)
Chloride
No GWQS (mg/L)
Nitrate, Nitrate + Nitrite
(10 mg/L) 1st Qtr , 3/16/2005 NS NS NS NS NS NS 2nd Qtr 5/25/2005 NS NS NS NS NS NS.. 3rd Qtr 8/31/2005 NS NS NS NS NS NS 4th Qtr 12/7/2005 NS NS NS NS NS NS 1st Qtr 3/9/2006 NS NS , NS, NS NS • NS 2nd Qtr 6/14/2006 NS NS_ NS NS NS NS 3rd Qtr 7/20/2006 NS NS NS NS NS NS 4th Qtr 11/8/2006 ,<1.0 NS <1.0 <1.0 37 2.4 .............. 1st Qtr 2/28/2007 <1.0 <1.0 <1.0 <1.0 38 2.3 2nd Qtr 6/27/2007 <1.6 <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 <1.6 38 0.8 ............. 1st Qtr 3/28/2008 <1.0 <1.0 <1.0 <1.0, 57 0.4 2nd Qtr 6/25/2008 <1.0 <1.0 <1.0 <.1.0 35 1.6 3rdQtr , , 9/10/2008 <1.0 <1.0 <1.0 <1.0 34 1.38 4th CHI- 10/15/2008 <1.0 <1.0 <1.0 <1.0 40 0.76 1st Qtr 3/4/2009 <1.0 <1.0 <1.0 <1.0 35 1.6 2nd Qtr 6/23/2009 <1.0 <1.0 <1.0 <1.0 36 1.4 3rd Qtr 9/14/2009 <1.0 <1.0 <1.0 <1.0 38 1.5 4th Qtr 12/16/2009 <1.0 <1.0 <1.0 <1.0 34 1.4 1st Qtr 3/23/2010 <1.0 <1.0 <1.0 <1.0 33 2.5 2nd Qtr 6/14/2010 <1.0 , <1.0 , <1.0 <1.0 49 2.9 3rd Qtr 8/10/2010 <1.0 <1.0 <1.0 <1.0 35 2.8 4th Qtr 10/15/2010 <1.0 <1.0 <1.0 <1.0 29 2.9
1st Qtr 2/15/2011 <1.0 <1.0 <1.0 <1.0 25 1.8
2nd Qtr 6/24/2011 <1.0 <1.0 <1.0 <1.0 24 1.4 3rd Qtr 8/16/2011 <1.0 <1.0 <1.0 <1.0 33 2.6 4th Qtr 11/15/2011 <1.0 <1.0 <1.0 <1.0 15 1.7 1st OfFrfy 1/17/2012 <1.0 <1.0 <1.0 <1.0 20 1.9 -2nd Qtr 6/14/2012 <1.0 <1.0 <1.0 <1.0 35 3.3 3rd Qtr 8/29/2012 <1.0 <1.0 <1.0 <1.0 37 3.9 4th Qtr 10/3i2012 <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.,8:.i. 1st Qtr 1/22/2014 <1.0 <1.0 <1.0 <1.0 35.5 5.9 2nd Qtr 5/21/2014 <1.0 <1.0 <1.0 <1.0 32.5 4.87 31-6 Qtr 8/13/2014 <1.0 <1.0 <1.0 <1.0 38 4.1 4th Qtr 10/23/2014 <1.0 <1.0 <1.0 <1.0 38.9 5.22 1st Qtr 3/12/2015 <1.0 1.7 <1.0 <1.0 40.1 5.22 2nd Qtr 6/10/2015 <1.0 1.82 <1.0 <1.0 41.8 3.55
3rd Qtr 9/3/2015 <1.0 <1.0 <1.0 <1.0 42.4 2.77
410...PY._. 10/23/2015 <1 0 1 46 <1 0 <1 0 40 6 2 45 1st car 3/16/2016 <1.0 4.49 <1.0 2,18 42.4 2.94
2nd Qtr 5/26/2016 <1.0 6.15 <1.0 3.18 46.6 2.45 3rd Qtr 8/3/2016 <1.0, 5 <1.0 1.8 42.4 2.88 4th Qtr 10/20/2016 <1.0 7.02 <1.0 1.59 45.6 2.86 lstQtr 3/15/2017 <1.0 6.45 , <1.0 2.18 45.4 4.36 2nd Qtr 6/15/2017 <1.0 6.85 <1.0 <1.0 46.9 5.12 3rd Qtr 8/2/2017 <1.0 6.14 <1.0 <1.0 46.4 4.84
41!".1..g.r.... ...1.0/1.0.I.2017, .1..:.9...... 6.13 <1.0 <1.0 42.5 4.73 1si Qtr 3/15/2018 <1.0 5.8 <1.0 2.18 51.5 5.67 2nd Qtr 6/13/2618 <.1.0 5.12 <1.0 <1.0 46.9 6.36
3rd Qtr 8/30/2018 <1.0 4.76 <1.0 <1.0 54.1 5.34
4th Qtr 12/12/2018 <1.0 4.41 <1.0 <1.0 48.7 5.85
1st Qtr 3/16/2019 <1.0 4.08 . „. <1.0 <1.0 48.7 6.16
2nd Qtr 6/13/2019 <1.0 4.18 <1.0 <1.0 48.3 5.86
3rd Qtr 9/11/2019 <1.0 6.08 <1.0 <1.0 45.4 4.77 . 4th Qtr 12/14/2019 <1.0 3.83 <1.0 <1.0 49.4 4.76
1st Qtr 3/17/2020 <1.0 2.98 <1.0 <1.0 48.4 6.17
2nd Qtr 6/11/2020 <1.0 2.87 <1.0 <1.0 47.6 6.57 3rd Qtr 9/18/2020 <1.0 2.41 <1.0 <1.0 45.1 5.57
(1) As of March 2012 both north and south wild life2onds no louer receivinuater.
NS = not sampled
Shaded indicates concentrations exceeding GWOS.
TABLE 1 (18 of 31)
Historic Summary Of Monitoring Well Analytical Results Up To The 3rd Qarter 2020
Chloroform Contamination Investigation
DUSA White Mesa Mill
TW4.46
Sampling Event
Parameter
(GWQS) Carbon Tetrachloride
(5 pg/L)
Chloroform
(70 pg/L)
Chloromethane
(30 pg/L)
Methylene Chloride
(5 pg/L)
Chloride
No GWQS (mg/L)
Nitrate, Nitrate + Nitrite
(10 mg/L)
1st Qtr 3/16/2005 NA 240 NA NA NA <0.1
2nd Qtr 5/25/2005 NA 212 NA NA NA <0.1
3rd Qtr 8/31/2005 <1.0 85 3.2 43 NA <0.1 4t5 Qtr 12/7/2005 <1.0 14 2.6 5.9 64 1.4 1st Qtr 3/9/2006 <1.0 39 1.1 21 60 3 2nd Qtr 6/14/2006 <1.0 13 2.4 8.9 55 1.9 3rd Qtr 7/20/2006 <1.0 5.2 <1.0 2.7 60 2.7 4th Qtr 11/8/2006 <1.0 13.6 <1.0 9.2 62 5.6 1st Qtr 2/28/2007 <1.0 8.7 <1.0 6.6 79 12.3 2nd Qtr 6/27/2007 <1.0 2.6 <1.0 1.8 75 9.9 3rd Qtr 8/15/2007 <1.0 7.1 <1.0 5.1 65 5.4 4th Qtr 10/10/2007 <1.0 1.4 <1.0 1 69 4.4 1st Qtr 3/28/2008 <1.0 11 <1.0 26 52 <0.1 2nd Qtr 6/25/2008 <1.0 <1.0 <1.0 <1.0 58 1.5 3rd Qtr 9/10/2008 <1.0 10 <1.0 14 71 10.5
4th Qtr 10/15/2008 <1.0 3.9 <1.0 6.6 89 9.8 1st Qtr 3/4/2009 <1.0 <1.0 <1.0 <1.0 73 9.6
2nd Qtr 6/23/2009 <1.0 <1.0 <1.0 <1.0 76 8.9 3rd Qtr 9/14/2009 <1.0 <1.0 <1.0 <1.0 79 8.8 4th Qtr 12/17/2009 <1.0 <1.0 <1.0 <1.0 76 5.2
1st Qtr 3/24/2010 <1.0 <1.0 <1.0 <1.0 77 4.
2nd Qtr 6/14/2010 <1.0 2.1 <1.0 <1.0 64 4.7
3rd Qtr 8/24/2010 <1.0 4.3 <1.0 <1.0 72 4.6
4th Qtr 10/15/2010 <1.0 3 <1.0 <1.0 71 3.3
1st Qtr 2/22/2011 <1.0 15 <1.0 <1.0 86 7 2nd Qtr 5/26/2011 <1.0 16 <1.0 <1.0 81 5
3rd Qtr 8/17/2011 <1.0 9.2 <1.0 <1.0 63 1.7 4th Qtr 11/16/2011 NA NA NA NA 38 0.4
1st Otr 0 12/7/2011
1/18/2012
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0 1... ............ 48 0.1 . .2n0 Qtr 5/26/2012 <1.0 <1.0 <1.0 <1.0 63 <0.1
3rd Qtr 8/30/2012 <1.0 <1.0 <1.0 <1.0 59 <0.1
4th Qtr 10/3/2012 <1.0 <1.0 <1.0 <1.0 59 <0.1
1st Qtr 2/7/2013 <1.0 <1.0 <1.0 <1.0 58.1 <0.1 2nd Qtr 5/30/2013 <1.0 <1.0 <1.0 4.21 49.8 <0.1 3rd Qtr 9/5/2013 <1.0 <1.0 <1.0 <1.0 54.4 <0.1
4th Qtr 11/7/2013 <1.0 13.4 <1.0 <1.0 56.6 1.37 ........... 1st Qtr 1/29/2014 <1.0 6.93 <1.0 <1.0 66.8 3.16
2nd Qtr 5/22/2014 <1.0 14.6 <1.0 <1.0 80.7 4.94
3rd Qtr (2) 8/14/2014 <1.0 229 <1.0 <1.0 80 5.1
3rd Qtr 9/24/2014 <1.0 371 <1.0 <1.0 NA NA
41h Qtr 10/29/2014 <1.0 387 <1.0 <1.0 92.1 8.4
1st Qtr 3/12/2015 <1.0 153 <1.0 <1.0 65 4.3 2nd Qtr 6/11/2015 <1.0 65.3 <1.0 <1.0 61 1.06 3rd Qtr 9/3/2015 <1.0 82 <1.0 <1.0 65.8 1.18 4tri.Qtr_ 10/28/2015 <1,0 112 <1.0 <1.0 58.3 1.69 1st Qtr 3/17/2016 <1.0 45.9 <1.0 <1.0 56.5 1.63 2nd Qtr 5/26/2016 <1.0 93.4 <1.0 <1.0 61.3 1.89 3rd Qtr 8/3/2016 <1.0 49 <1.0 <1.0 60 2.20 4th Qtr 10/26/2016 <1.0 92.9 <1.0 <1.0 66.7 9,78 1st Qtr 3/16/2017 <1.0 19.1 <1.0 <1.0 62.2 .2J5
2nd Qtr 6/20/2017 <1.0 64.3 <1.0 <1.0 60.6 1.81 3rd Qtr 8/3/2017 <1.0 143 <1.0 <1.0 67.1 2.63
4th Qtr 10/11/2017 <1.0 98 <1.0 <1.0 54.2 2.12
DWMRC sptit sample <0.95 92 <1.5 ...9j 64 2.00
1st Qtr 3/20/2018 <1.0 170 <1.0 <1.0 85.1 .4.5
Duplicate TW4-75 <1.0 171 <1.0 <1.0 84.7 4.51
2nd Qtr 6/14/2018 <1.0 54.5 <1.0 <1.0 62.5 2.83
3rd Qtr 8/30/2018 <1.0 54.5 <1.0 <1.0 73 2.53 4th Qtr 12/12/2018 <1.0 52.0 <1.0 <1.0 68.8 2.88 1st Qtr 3/19/2019 <1.0 60.6 <1.0 <1.0 66.3 3.36 2nd Qtr 6/19/2019 <1.0 76.2 <1.0 <1.0 71.5 2.43 3rd Qtr 9/12/2019 <1.0 99.8 <1.0 <1.0 72.9 3.55 4th Qtr 12/14/2019 <1.0 94.3 <1.0 <1.0 88.6 3.37 Duplicate TW4-75 <1.0 91.0 <1.0 <1.0 84.1 3.12
1st 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 (1) VOCs were resampled because laboratory missed holding fime. (2) VOCs were resampled (3) As of March 2012 both north and south wild life ponds no longer receiving water.
NA = not analyzed Shaded indicates concentrations exceeding GWQS J = Approximate value
TABLE 1 (19 of 31)
Historic Summary Of Monitoring Well Analytical Results Up To The 3rd garter 2020
Chloroform Contamination Investigation
DUSA White Mesa Mill
TW4-18
Sampling Event
Parameter
(GWQS) Carbon Tetrachloride
(5 pg/L)
Chloroform
(70 pg/L)
Chloromethane
(30 pg/L)
Methylene Chloride
(5 pg/L)
Chloride
No GWQS (mg/L)
Nitrate, Nitrate + Nitrite
(10 mg/L)
1st Qtr
2nd Qtr
3rd Qtr
4th Qtr
1st Qtr
2nd Qtr
3rd Qtr
4th Qtr
1st Qtr
2nd Qtr
3rd Qtr
4th Qtr
1st Qtr
2nd Qtr
3rd Qtr
4th Qtr
1st Qtr
2nd Qtr
3rd Qtr
4th Qtr
1st Qtr
2nd Qtr
3rd Qtr
4th Qtr
lst Qtr
2nd Qtr
3rd Qtr
4th Qtr
(1). fifrar (2)-
.2nd Qtr
3rd Qtr
4th Qtr
1st Qtr
2nd Qtr
3rd Qtr
4th Qtr
1st Qtr
2nd Qtr
3rd Qtr
4th Qtr
1st Qtr
2nd Qtr
3rd Qtr
4th Qtr
1st Qtr
2nd Qtr
3rd Qtr
4th Qtr
1st Qtr
Duplicate TW4-75
2nd Qtr
3rd Qtr
Duplicate TW4-75
4th Qtr
1st Qtr
2nd Qtr
3rd Qtr
4th Qtr
1st Qtr
2nd Qtr
Duplicate TW4-75
3rd Qtr
4th Qtr
1st Qtr
2nd Qtr
3rd Qtr
3/16/2005
5/25/2005
8/31/2005
12/7/2005
3/9/2006
6/14/2006
7/20/2006
11/8/2006
2/28/2007
6/27/2007
8/15/2007
10/10/2007
3/28/2008
6/25/2008
9/10/2008
10/15/2008
3/4/2009
6/23/2009
9/14/2009
12/17/2009
3/24/2010
6/14/2010
8/12/2010
10/15/2010
2/22/2011
5/26/2011
8/17/2011
11/16/2011
12/7/2011
1/18/2012
6/13/2012
9/11/2012
10/3/2012
2/13/2013
6/13/2013
9/5/2013
11/13/2013
1/30/2014
5/22/2014
8/14/2014
10/28/2014
3/12/2015
6/11/2015
9/3/2015 10/28/2015
3/17/2016
6/8/2016
8/3/2016
10/26/2016
3/16/2017
6/20/2017
8/3/2017
10/11/2017
3/15/2018 6/13/2018
8/30/2018
12/13/2018
3/19/2019
6/19/2019
9/11/2019
12/18/2019
3/18/2020
6/12/2020
9/18/2020
NA
NA
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0 <1.0
<1.0
<1.0
NA
<1.0
<1.0
<1.0
<1.0 <1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1 0 <1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0 <1.0
<1.0
<1.0
<1.0 • <1.0
<1.0
<1.0
<1.0
<1.0 <1.0
<1.0
NA
38
29.8
39
14
12
12
10.8
12.5
9.2 8
8.9
7.4
6.4
5.7
8
9.4
11
16
13
8.2
69
29
29
30
39
26
29
28
24
38
30 34.9
37.9
41
44.3
6.93
6.93
32.8
33
32
30.5
28.7
52 9
56.6
60
56.3 60.1
62
61.5
63.8
62.8
62.3
62.9
62.3
59.9
56.2
57.6
52.8
54.2 54.4
56.2
62.0
57.0
58.2
60.0
25
NA
NA
<1.0
<1.0
<1.0 <1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1 . 0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
NA <1.0
<1.0
<1.0
<1.0
<1.0 <1.0
<1.0 <1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0 <1 0
<1.0
<1.0
<1.0 <1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1 . 0
<1.0
<1.0
2.8
1.1
1.6
2.7
NA
NA
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
41.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
NA
<1.0 <1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1 0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0 •
<1.0
<1.0
<1.0
<1.0
<1 . 0
<1.0
<1.0
NA
NA
NA
41
36
35
35
34
30
28
32
27
23
23
26
30
29
30
26
:ii
35
37
50,
52
36
23
23
NA 18
30
26
27
23.1
22.9
36.2
37.1
38.9
47
49
40.8
41.6
43.5
47.6
40.7
43.8
40.7
43.9 39.4
41.1
41.6
40.4
41.5
37.1
44.3
39.5
45.6
......38.2..
3/.6
39.5
40.8
36.8 42.7
39.4 41.4
38.7
(2, ..
39 4
NA
14.1 12.9
13.3
7.3
5.9
4.7
6.1
5.7
5.1
4.9
5.0
4 4
ai
4.6
4.9
5.2
5.2
6.2
5.9 5.4
5.1
9.0
9.0
....1.0.:0 10.5
9.0
4.6
6.3
..„............ 4.4
6.5
6.6
6.0
5.6
8.9
12.1
14.2 12.8
12.2
9.8 11.1
11.7
9.69
15.7
6 24
5.96
5.45
5.79
.5.4. 4.47
4.41
4.50 4.24
4.31
4.43
4.32
4.09
3.51
3.60
3.6.5
4.01
2.95
3.25
3.02
3.71
3.62 3.36
s were resampled because laboratory missed h01din0 time. (2) As of March 2012 both north and south wild life ponds no longer receiving water.
NA not analyZed Shaded indicates concentratons exceeding GWOS
TABLE 1 (20 of 31)
Historic Summary Of Monitoring Well Analytical Results Up To The 3rd Qarter 2020
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 + Nitrite
(10 mg/L)
1st Qtr 3/16/2005 NA 2200 NA NA NA 5.3
2nd Qtr 5/25/2005 NA .„. , , , , , 1,200 NA , NA NA 5.7
3rd Qtr 8/31/2005 <5.0 1,400 <5.0 <5.0 NA 4.6
4th Qtr 12/7/2005 <50 2,800 <50 <50 81 <0.1
1st Qtr 3/9/2006 <50 1,200 <50 <50 86 4
2nd Qtr 6/14/2006 <50 1,100 <50 <50 116 5.2
3rd Qtr 7/20/2006 <50 1,120 <50 <50 123 4.3
4th Qtr 11/8/2006 1.6 1 050 2.6 <1.0 134 4.6
1st Qtr 2/28/2007 1.3 1200, <1.0 <1.0 133 4
2nd Qtr 6/27/2007 Did not sample
3rd Qtr 8/15/2007 . 1.9 1,100 <1.0 <1.0 129 4.1 4th Qtr 10/10/2007 1.9 1,100 <1.0 <1.0 132 4 10t Qtr 3/28/2008 2.9 1,800 <1.0 <1.0 131 2.2 2nd Qtr 6/25/2008 <1.0 1,000 <1.0 <1.0 128 2.8 . „ 3rd Qtr 9/10/2008 8.6 3,600 <1.0 <1.0 113 35.2
4th Qtr 10/15/2008 12 4.,00 <1.0 <1.0 124 47.8
1st Qtr 3/4/2009 1.2 1,100 <to_ <1.0 127 3.2
2nd Qtr 6/23/2009 1.2 990 <1.0 - <1.0 132 2.4
3rd Qtr 9/14/2009 15 6,600 <1.0 <1.0 43 <0.1
4th Qtr
lst Qtr
12/22/2009
2/17/2010
16 4,7.00
940
<1.0
<1.0
<1.0
<1.0
124
144 ...2:7, 2 1.3
2nd Qtr 6/14/2010 4.2 1,800 <1.0 <1.0 13,2 4.4
3rd Qtr 6i16/2010 4.9 2,000 <1.0 <1.0 142 5.9 4th Qtr 10/15/2010 1.3 .1200. <1.0 <1.0 146 2.7 .............. 1st Qtr 2/17/2011 17 3A00 <1.0 <1.0 135 17.0
2nd Qtr 6/7/2011 8.3 4,000 <1.0 <1.0 148 12.0 3rd Qtr 8/17/2011 2.1 970 <1.0 <1.0 148 3.0 4th Qtr 11/16/2011 148 5.0 . (1). 12/5/2011 5.4 ..a.?po <1.0 <1.0 fiftlfq2). 1/23/2012 1.5 650<1.0 <1.0 138 0.6
'2nd Qtr 6/6/2012 1.1 , 460 -<1.0 <1.0 149 2.4
3rd Qtr 9/4/2012 3.5 950 <1.0 <1.0 149 2.5
4th Qtr 10/3/2012 4 1500 <1.0 <1.0 150 4.1 1st Qtr 2/13/2013 5.15 4,210 <1.0 <1.0 164 8.0 2nd Qtr 6/5/2013 5.15 2,070 <1.0 <1.0 148 3.0
3rd Qtr 9/3/2013 20.7 8,100 <1.0 <1.0 179 17.6
4th Qtr 10i29/2013 6.42 942 <1.0 <1.0 134 4.7
1st Qtr 1/27/2014 4.05 586 , <1.0 <1.0 134 1.6
2nd Qtr , 5/19/2014 5.51 810 <1.0 <1.0 152 1.3
3rd Qtr 8/11/2014 1.9 1,410 8.3 <1.0 140 1.6
4th Qtr 10/21/2014 4.8 ..4.,..10 <1.0 <1.0 130 4.7
1st Qtr 3/9/2015 8.92 4,660 <1.0 <1.0 238 8.56
2nd Qtr 6/8/2015 2.62 1,570 <1.0 , <1.0 180 0.916
3rd Qtr 8/31/2015 <1.0 7,860 7.76 <1.0 326 11.6 4pagr._....., 10/19/2015 12.2 7,840 5.46 <1.0 252 10.6
'1st Qtr 3/9/2016 , 13.5 7,780 1.4 <1.0 276 , 15.-70
2nd Qtr ' ' ' 5/26/2016 23.1 12,600 <1.6 , <1.0 204 1.27
3rd Qtr 7/25/2016 9.89 6,040 <1.0 <1.0 214 10.5 4th Qtr 10/13/2016 10.6 6 640 <1.0 <1.0 200 ...10.0. lst Qtr 3/8/2017 3.06 1,240 <1.0 <1.0 461 1171 2nd Qtr 6/13/2017 1.35 510 <1.0 <1.0 135 0.243 3rd Qtr 7/26/2017 13.0 8,840 <1.0 , <1.0 218 1.120
4th Qtr 10/11/2017 <1.0 129 <1.0 <1.0 139 0.377
1st Qtr 3/12/2018 1.36 2,640 <1.0 <1.0 193 8.6
2nd Qtr 6/8/2018 3.45 2,980 <1.0 <1.0 138 0.494
3rd Qtr 8/30/2018 2.03 1,910 <1.0 <1.0 166 ..... 2.55
4th Qtr 11/28/2018 6.18 ..5270 <1.0 <1.0 140 0.233
1st Qtr 3/8/2019 2.43 2,050 <1.0 <1.0 197 6.58
2nd Qtr 6/5/2019 15.9 11,500 <1.0 <1.0 160 8.96
3rd Qtr 9/4/2019 10.1 6,670 <1.0 <1.0 153 0.33
4.Y.1.gr_. ..1.2!..122019 ..I.0.... 551 <1.0 <1.0 147 0.535
)st Qtr 2/19/2620 13.7 8,720 5.41 <1.0 205 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 11.60
(1) VOCs were resampled because laboratory missed holding time. (2) As of March 2012 both north and south wild life ponds no longer receiving water.
NA not analyzed
Bold and italics indicates the MDL exceeded the GWQS.
Shaded indicates concentrations exceeding GWQS.
TABLE 1 (21 of 31)
Historic Summary Of Monitoring Well Analytical Results Up To The 3rd Qarter 2020
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 Monitor well was not installed 2nd Qtr (3) 5/25/2005 NA 39,000 NA NA NA 10.10 -3rd Qtr 8/31/2005 <10 3,800 <10 <10 NA 2.915 4th Qtr 12/7/2005 <250 19,900 <250 <250 131 1.80 .................. 1st Qtr 3/9/2006 <500 9,200 <500 <500 120 3.80 2nd Qtr 6/14/2006 <500 61,000 <500 <500 235 9.40 3rd Qtr 7/20/2006 <1000 5,300 <1000 <1000 134 2.90 4th Qtr 11/8/2006 7.1 11 000 1.9 2.2 124 .......159 1st Qtr 2/28/2007 3.1 4,400 <1.0 1.1 124 4.26 2nd Qtr 6/27/2007 2.2 1,800 <1.0 <1.0 112 2.30 3rd Qtr 8/15/2007 3.5 5,200 <1.0 1.8 117 2.10 4th Qtr 10/10/2007 6.8 9,900 <1.0 1.9 170 5.60 1st Qtr 3/28/2008 9 1-3,060 <1.0 1.5 132 0.90 2nd Qtr 6/25/2008 13 30,000 <1.0 1.2 191 8.00 3rd Qtr 9/10/2008 15 21,000 <1.0 3.7 156 4.44 4th Qtr 10/15/2008 NA NA NA NA 168 5.51 1st Qtr 3/4/2009 5.7 8,200 <1.0 5.2 164 5.10 2nd Qtr 6/23/2009 4.9 6,800 <1.0 4.2 164 2.90 3rd Qtr 9/14/2009 8.4 13,000 <1.0 4.4 153 3.30 4th Qtr 12/22/2009 14 1 .,.0c)c, <1.0 3.0 187 5.30 ........... 1st Qtr 2/17/2010 2.7 0,60 <1.0 3.2 179 .2.00 2nd Qtr 6/14/2010 11 18,000 <1.0 3.7 200 5.60 3rd Qtr 8/16/2010 12 15,000 <1.0 2.2 196 5.30 4th Qtr 10/15/2010 20 24,000 <1.0 5.5 203 4.60 1st Qtr 2/17/2011 27 31,000 <1.0 19.0 220 4.40 2nd 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 4th Qtr Tit War 11/16/2011
1/23/2012 71.02_ 7,900 .... 11,000 <1.0 <1.0 • 2.5 1.3 .....
186 207 4.20 7.90 -2nd Qtr 6/6/2012 33 36,000 <1.0 <1.0 262 11.06 3rd Qtr 9/4/2012 26 13,000 <1.0 <1.0 289 10.80 41h Qtr 10/3/2012 22 19,000 <1.0 <1.0 302 11.00 1st Qtr 2/11/2013 19.6 1.8,560 <1.0 1.21 252 9.07 2nd Qtr 6/5/2013 32.5 26,300 <1.0 1.3 250 9.80 3rd Qtr 9/3/2013 25.7 26,800 <1.0 2.14 260 8.65 4th Qtr 10/29/2013 17.3 15200 <1.0 1.37 272 .....9.,61 lst Qtr 18.4 17,800 <1.0 2.04 254 7.56 2nd Qtr 5/19/2014 22.1 22,100 2.31 3.98 269 5.95 3rd Qtr 8/11/2014 14.1 12,400 55.2 2.2 299 4.30 4th Qtr 10/21/2014 18.5 21300 4.04 2.38 292 7.67 1st Qtr 3/9/2015 20.8 1.9,900 4.85 1.38 290 9.80 2nd Qtr 6/8/2015 16.2 17,600 13.4 1.73 296 5.76 3rd Qtr 8/31/2015 15.1 17,000 12.3 <1.0 365 9.3 4th Qtr 10/19/2015 14.5 17,000 10.8 1 293 6.23 1st Qtr 3/9/2016- 20.2 21,600 4.09 1.16 293 10 2nd Qtr 5/23/2016 40.6 33,700 <1.0 <1.0 318 1.13.20
3rd Qtr 7/25/2016 26.6 23,600 <1.0 <1.0 307 11.3 4th Qtr 10/12/2016 24.4 21,300 <1.0 <1.0 301 11.4 1st Qtr 3/8/2017 23.5 23,460 <1.0 <1.0 290 12.0 2nd Qtr 6/13/2017 23.4 18,100 <1.0 <1.0 281 9.76 3rd Qtr 7/26/2017 25.0 27,600 1.25 <1.0 292 10.8 4th Qtr 10/12/2017 11.2 11,690 2.34 <1.0 293 8.91 1st Qtr 3/12/2018 15.9 1.5,400 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 11/28/2018 8.32 .._,§90,_ 15.6 <1.0 9.72 ................. 1st Qtr 3/8/2019 15.4 15,600 <1.0 <1.0 272 6.7 2nd Qtr 6/5/2019 10.1 13,700 <1.0 <1.0 279 9.59 3rd Qtr 9/4/2019 8.39 10,500 <1.0 <1.0 286 10.20 4th Qtr 12/10/2019 5.92 8290 2.67 <1.0 307 ......925., 1st Qtr 2/19/2020 8.6 1.4,360 10.7 <1.0 310 9.81 2nd Qtr 5/27/2020 6.74 5,800 1.3 12.3 3.01 7.23 Well TW4-20 Abandoned
(1) VOCs were resampled because laboratory missed holding ime. (2) As of March 2012 both north and south wild life ponds no longer receiving water.
jaChloroform_pumira well stalted 8/4/05.
NA = not analyzed
Bold and italics indicates the MDL exceeded the GWQS. Shaded indicates concentrations exceeding GWQS.
TABLE 1 (22 of 31)
Historic Summary Of Monitoring Well Analytical Results Up To The 3rd garter 2020
Chloroform Contamination Investigation
DUSA White Mesa Mill
TW4-21 (chloroforrn purnping well 6/9/15)
Sampling Event
Parameter
(GWQS)
Carbon Tetrachloride
(5 pg/L)
Chloroform
(70 pg/L)
Chloromethane
(30 pg/L)
Methylene Chloride
(5 pg/L)
Chloride
No GWQS (mg/L)
Nitrate, Nitrate + Nitrite
(10 mg/L)
1st Qtr 3/16/2005
2nd Qtr ,5/25/2005
3rd Qtr 8/31/2005
4th Qtr 12/7/2005
1st Qtr 3/9/2006
2nd Qtr, , 6/14/2606 3r6 Qtr 7/20/2006 4th Qtr 11/8/2006
1st Qtr 2/28/2007
2nd Qtr 6/27/2007 3rd Qtr 8/15/2007
4th Qtr 10/10/2007
lot Qtr 3/28/2008
2nd Qtr 6/25/2008
3rd Qtr 9/10/2008
4th Qtr 10/15/2008
11/18/2008
1st Qtr 3/11/2009
2nd Qtr 6/23/2009
3rd Qtr 9/14/2009
4t5 Qtr 12/22/2009
1st Qtr 2/25/2010,
2nd Qtr 6/14/2010
3rd Qtr 8/13/2010
4th Qtr 10/15/2010
1st Qtr 2/22/2011 2nd Qtr 6/28/2011 3rd Qtr 8/17/2011 4th Qtr i 1/16/2011 (1).. 12/7/2011
'fif.MFM. 1/23/2012
-2nd Qtr 6/6/2012 3rd Qtr 9/4/2012 4th Qtr 10/3/2012 1st Qtr 2/11/2013 2nd Qtr 6/5/2013
3rd Qtr 9/3/2013
4th Qtr 10/29/2013
1st Qtr 1/27/2014
2nd Qtr 5/19/2014
3rd Qtr 8/11/2014
4th Qtr 10/21/2014
1st Qtr 3/9/2015 2nd Qtr (3) 6/8/2015 .3rd Qtr 8/31/2015
4p3..cy_.. 10/19/2015
ist Qtr 3/9/2016
2nd Qtr 5/23/2016
3rd Qtr 7/25/2016
4th Qtr 16/12/2016
1st Qtr 3/8/2017
2nd Qtr 6/13/2017
3rd Qtr 7/26/2017
4th Qtr 10/11/2017
DWMRCapyt.tamp!0 1st Qtr 3/12/2018 2nd Qtr 6/8/2018 3rd Qtr 8/22/2018
4th Qtr 10/22/2018
1st Qtr 3/8/2019
2nd Qtr 6/5/2019
3rd Qtr 9/4/2019
4t5 Qtr 12/10/2019 1st Qtr 2/19/2020
2nd Qtr 5/27/2020
3rd Qtr 9/4/2020
NA
<5.0
<1.0
<2.5
<2.5
<2.5
<1.0
<1.0
NA
<1,,0 , <1.0
<1 0 . : <1 0
<1.0
<1.0
<1.0
.
<1.0
<1.0
<1 0
<1.0
<1.0
<1.0
<1.0
<1.0
<3.8
<1,0 <1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
2
1.8
5.8
7 1.7
1.6
2
9.2
1.2
4.8
6.3
6.7
6.4
5.4
6
7
5.25
3.49
2.13
6.23
4.73
1.04
1.75
1.92
2.36
1.16
1.0
2.36
1.2
NA
,-
192
78
86
120
120
108
139
160
300
140
113
390
180
120
170
180
200
200
160
170
210
390
200
230
290
460
390

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

339
390
545
456
456
598
224
537
466
400
421
532
476
585
323
734
596,
794
844
767 920
NA
<5.0
<1.0
<2.5
<2.5
<2.5
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
NA <2.0
<1.0
<1.0
<1.0
<1 0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0 <1.0
<1.0
<1.0
<1.0 , <1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<6.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0 <1.0
Monitor
,
2.58
well wos not installed
NA
<5.0
<1.0
<2.5
<2.5
<2.5
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
NA
<2.0
<1.0
<1.0
<1.0
<1 0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0 <1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
2.04
2 04
<1.0 <1.0
<1.0
<1.0
<1.0
<1 0
<1.0
<1.0,
<1.0
<1.0 <1.0
<1.0
<1.0
<1.0
14 J
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0 <1.0
<1.0,
<1.0 <1.0
NA
NA
NA
353
347
318
357
296
306
327
300
288
331
271
244
284
279
291
281
256
228
266
278
210
303
290
287
287
............ 228
285
142
270
221
243
207
206
200
243
230
252
255
494
499
413
452
425
457
439
452
309 , 447
378
310
447
387
182
392
180
456
478
339 446
353
382
14.6
10.1
9.6
8.
10.2
§z 9. 6.7
8.7
8.6
8.6
8.3
14.3
8.8
7.57
8.0
NA
8.3
8.1
9.2
8 4
8.4
12.0
14.0 7.0
9.0
12.0
14.0
13.0
..9.:6
11.6 13.0
14.0
11.8
13.8
10.3
9.0
11.4
11.5
7.1
10.0
10.9 13.1
14.1
14 3
14.6
13.1
16.5
13.5
17.7
9.53
18.20
16.90
11
15.8
14.1
0.236
15.2
8.99
17.5
14.7
5.73 8.93
15.4
12.6 s were resampled because laboratory missed holdingtime. (2) As of March 2012 both north and south wild life ponds no longer receiving water. 57n7iarn pumping well started 6/9/15.
= not analyzed
Shaded indicates concentratons exceeding GWQS.
J = Approximated value
TABLE 1 (23 of 31)
Historic Summary Of Monitoring Well Analytical Results Up To The 3rd Qarter 2020
Chloroform Contamination Investigation
DUSA White Mesa Mill
TW4-22 (nitrate pumping well started 1/26/13)
Sampling Event
Parameter
(GWQS)
Carbon Tetrachloride
(5 pg/L) Chloroform (70 pg/L) Chloromethane
(30 pg/L)
Methylene Chloride
(5 pg/L)
Chloride
No GWQS (mg/L)
Nitrate, Nitrate + Nitrite
(10 mg/L) 1st Qtr 3/16/2005 Monitor well was not installed 2nd Qtr 5/25/2005 NA 340 NA NA NA 18.2 3rd Qtr 8/31/2005 <5.0 290 <5.0 <5.0 NA 15.7 4th Qtr 12/7/2005 <5.0 320 <5.0 <5.0 253 15.1 1st Qtr , 3/9/2006 <10 390 <10 <10 236 15.3 2nd Qtr 6/14/2006 <10 280 <10 <10 221 14.3 3rd Qtr 7/20/2006 <10 864 <10 <10 221 14.5 , 4th Qtr 11/8/2006 <1.0 350 1.6 <1.0 236 15.9 1st Qtr 2/28/2007 <1.0 440 <1.0 <1.0 347 20.9 2nd Qtr 6/27/2007 <1.0 740 <1.0 <1.0 273 19.3 3rd Qtr 8/15/2007 <1.0 530 <1.0 <1.0 259 19.3 4th Qtr 10/10/2007 <1.0 440 <1.0 <1.0 238 .......1.6,6. l§t Qtr 3/28/2008 <1.0 1 400 <1.0 <1.0 , 519 39.1 2nd Qtr 6/25/2008 <1.0 1200, <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 NA NA NA 539 36.3 11/18/2008 <2.0 630 <2.0 <2.0 NA NA 1st Qtr 3/11/2009 <1.0 390 <1.0 <1.0 177 , 20,7 2nd Qtr 6/23/2009 <1.0 730 <1.0 <1.0 177 . „.. 20.6 3rd Qtr 9/14/2009 <1.0 2,300 <1.0 <1.0 391 40.3 4th Qtr 12/29/2009 <1.0 380 <1.0 <1.0 175 ..17,3 1st Qtr 3/23/2010 <1.0 2,200 <1.0 <1.0 427 5.6.6 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 dtr 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 NA NA NA 174 19.0 (1) 12f7/2011 <1.0 400 <1.0 <1.0 NA NA -TM-MU Tff'Ofe121•••• <1.0 200 <1.0 <1.0 36 14.0 -2nd Qtr 6/13/2012 <1.0 120 <1.0 <1.0 35 12.6 3rd Qtr 9/12/2012 <1.0 121 <1.0 <1.0 7.0 4th Qtr 16/4/2012 <1.0 - 330 <1.0 <1.0 130 14.0 1st Qtr (3) 2/11/2013 3.24 10,600 <1.0 <1.0 130 58.0 2nd Qtr 6/5/2013 3.35 12,500 <1.0 <1.0 586 50.2 3rd Qtr 9/3/2013 3.25 9,640 <1.0 <1.0 487 .... 29.7 4th Qtr 10/29/2013 8.09 13,.300 <1.0 <1.0 501 45.2 1st Qtr 1/27/2014 , 6.06 12,100 <1.0 2.83 598 . . 54.6 2nd Qtr 5/19/2014 6.65 12,400 <1.0 <1.0 614 47.2 3rd Qtr 8/11/2014 1.9 12,400 40 <1.0 540 41.5 4th Qtr 10/29/2014 3.32 11,4.00 1.61 <1.0 596 54.9 1st Qtr 3/9/2015 3.77 12,700 4.31 <1.0 675 69.2 2nd Qtr 6/8/2015 2.42 8,050 3.42 <1.0 390 47.1 3rd Qtr 8/31/2015 <1.0 7,810 5.47 <1.0 557 64.7 4th Qtr 10/19/2015 3 32 _ 7.,590 5 1 <1 0 567 56 1 1st Qtr 3/9/2016 <1.0 -6,071<1.0 <1.0 583 31.1 2nd Qtr 5/23/2016 2.64 8,570 <1.0 <1.0 598 58.4 3rd Qtr 7/25/2016 <1.0 5,840 <1.0 <1.0 619 61,3 4th Qtr 10/12/2016 1.08 3,370 <1.0 <1.0 588 61.5 1st Qtr 3/8/2017 1.56 5,320 <1.0 <1.0 566 69.8 2nd Qtr 6/13/2017 1.21 3,670 <1.0 <1.0 572 70.8 3rd Qtr 7/26/2017 <1.0 5,150 <1.0 <1.0 691 66.1 4th Qtr 10/11/2017 <1.0 4,770 <1.0 <1.0 600 80.1 DWMRC epfit.arnple. <38 ..4,100 <60 150 ,1 610 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 ,1,680 <1.0 <1.0 567 75.7 1st Qtr 3/8/2019 1.02 4,310 <1.0 <1.0, 528 71.9 2nd Qtr 6/5/2019 1.13 4,690 <1.0 <1,0 662 83.9 3rd Qtr 9/4/2019 <1.0 3,460 <1.0 <1.0 588 72.5 4th Qtr 12/10/2019 <1.0 .3820 <1.0 <1.0 gc.)P. ......9.,9.. lst Qtr 2/19/2020 1.02 -3 , , 910 <1.0 <1.0 606 57.7 2nd Qtr 5/27/2020 <1.0 2,530 <1.0 <1.0 578 60.5 3rd Qtr 9/4/2020 <1.0 3,760 <1.0 <1.0 514 64.8 (1) VOCs were resampled because laboratory missed holding time. (2) As of March 2012 both north and south wild life ponds no longer receiving water.
Chloroformjum.eita well started 1/26/13 -NA = n7t7inalyzed Shaded indicates concentrabons exceeding GWQS. Bold and italics indicates the MDL exceeded the GWQS. J = Approximated value
TABLE 1 (24 of 31) Historic Summary Of Monitoring Well Analytical Results Up To The 3rd garter 2020
Chloroform Contamination investigation
DUSA White Mesa Mill
TW4-23
Sampling Event
Parameter
(GWQS)
Carbon Tetrachloride
(5 pg/L)
Chloroform
(70 pg/L)
Chloromethane (30 pg/L) Methylene Chloride
(5 pg/L)
Chloride No GWQS (mg/L)
Nitrate, Nitrate o- Nitrite
(10 mg/L)
2nd Qtr 6/27/2007 <1.0 <1.0 <1.0 <1.0 47 <0.1
3rd Qtr 8/15/2007 <1.0 <1.0 <1.0 <1.0 46 <0.1
4th Qtr 10/10/2007 <1.0 <1.0 <1.0 <1.0 43 <0.1
1st Qtr 3/28/2008 <1.0 <1.0 <1.0 <1.0 41 <0.1
2nd Qtr 6/25/2008 <1.0 <1.0 <1.0 <1.0 41 <0.1
3rd Qtr 9/10/2008 <1.0 <1.0 <1.0 <1.0 35 <0.05
4th Qtr 10/15/2008 NA NA NA NA 51 <0.05
11/18/2008 <2.0 <2.0 <2.0 <2.0 NA NA
1st Qtr 3/4/2009 <1.0 <1.0 <1.0 <1.0 41 <0.1
2nd Qtr 6/23/2009 <1.0 <1.0 <1.0 <1.0 43 <0.1
3rd Qtr 9/14/2009 <1.0 <1.0 <1.0 <1.0 43 <0.1
4th Qtr 12/16/2009 <1.0 <1.0 <1.0 <1.0 37 <0.1
1st Qtr 3/24/2010 <1.0 <1.0 <1.0 <1.0 45 <0.1
2nd Qtr 6/14/2010 <1.0 <1.0 <1.0 <1.0 40 <0.1
3rd Qtr 8/24/2010 <1.0 <1.0 <1.0 <1.0 40 <0.1
4th Qtr 10/15/2010 <1.0 <1.0 <1.0 <1.0 34 <0.1
1st Qtr 2/16/2011 <1.0 <1.0 <1.0 <1.0 44 <0.1
2nd Qtr 6/14/2011 <1.0 <1.0 <1.0 <1.0 44 <0.1
3rd Qtr 8/16/2011 <1.0 <1.0 <1.0 <1.0 41 <0.1
4th Qtr 11/15/2011 <1.0 <1.0 <1.0 <1.0 .A3, <0.1 TialtiTIT 1/17/2012 <1.0 <1 0 <1.0 <1.0 40 1 . 2nd Qtr 5/31/2012 <1.0 <1.0 <1 0 - „.„ <1.0 44 <0.1
3rd Qtr 8/29/2012 <1.0 <1.0 <1.0 <1.0 46 <0,1
4t5 Qtr 10/3/2012 <1.0 <1.0 <1.0 <1.0 45 <0.1
1st Qtr 2/7/2013 <1.0 <1.0 <1.0 <1.0 43.6 <0.1
2nd Qtr 5/30/2013 <1.0 <1.0 <1.0 <1.0 44.7 0.1
3rd Qtr 9/5/2013 <1.0 <1.0 <1.0 <1.0 48 <0.1
4th Qtr 11/7/2013 <1.0 <1.0 <1.0 <1.0 43 <0.1
1st Qtr 1/23/2014 <1.0 <1.0 <1.0 <1.0 44_6 <0.1
2nd Qtr 5/19/2014 <1.0 <1.0 <1.0 <1.0 42.3 <0.1
3rd Qtr 8/13/2014 <1.0 <1.0 <1 0 ... „ <1.0 46 <0.1
4g.i..gr_.... ...1.0/.2.8.1221....4...1...0 . <1.0 <1.0 <1.0 46.8 <0.1
1st Qtr 3/12/2015 <1.0 <1.0 <1.0 <1.0 47.3 <0.1
2nd Qtr 6/8/2015 <1.0 <1.0 <1.0 <1.0 48.4 <0.1
3rd Qtr 9/3/2015 <1.0 <1.0 <1.0 <1.0 54.1 <0.1
4th Qtr 10/28/2015 <1.0 <1.0 <1.0 <1.0 46.4 <0.1
Duplicate TW4-70 <1.0 <1.0 <1.0 <1.0 464 <0.1
1st Qtr 3/16/2016 <1.0 <1.0 <1.0 <1.0 49.1 <0.1
2nd Qtr 5/26/2016 <1.0 <1.0 <1.0 <1.0 50.4 <0.1
3rd Qtr 8/23/2016 <1.0 <1.0 <1.0 <1.0 49.6 <0.1
Duplicate TWA-70 <1.0 <1.0 <1.0 <1.0 48.3 <0.1
4th Qtr 10/12/2016 <1.0 <1.0 <1.0 <1.0 52.1 <0.1
1st Qtr 3/15/2017 <1.0 <1.0 <1.0 <1.0 47.7 <0.1
Duplicate TW4-70 <1.0 <1..0 <1.0 <1.0 49.8 <0.1
2nd Qtr 6/15/2017 <1.0 <1.0 <1.0 <1.0 51.5 <0.1
3rd Qtr 8/2/2017 <1.0 <1.0 <1.0 <1.0 51.8 <0.1
4th Qtr 10/10/2017 <1.0 <1.0 <1.0 <1.0 44.7 <0.1
DWMRC.gfitt sem& <0.19 <0.16 <0.3 0.32 52 0.028 J
1st Qtr 3/14/2018 <1.0 <1.0 <1.0 <1.0 53.8 <0.1
2nd Qtr 6/13/2018 <1.0 <1.0 <1.0 <1.0 47.6 <0.1
Duplicate TW4-70 <1.0 <1.0 <1.0 <1.0 47.9 <0.1
3rd Qtr 8/30/2018 <1.0 <1.0 <1.0 <1.0 56 <0.1
4th Qtr 12/12/2018 <1.0 <1.0 <1.0 <1.0 54.9 <0.1
1st Qtr 3/16/2019 <1.0 <1.0 <1.0 <1.0 48.9 <0.1
2nd Qtr 6/13/2019 <1.0 <1.0 <1.0 <1.0 50.2 <0.1 . 3rd Qtr 9/11/2019 <1.0 <1.0 <1.0 <1.0 47.9 <0.1
4th Qtr 12/10/2019 <1.0 <1.0 <1.0 <1.0 54.4 <0.1
1st Qtr 3/17/2020 <1.0 <1.0 <1.0 <1.0 50.0 <0.1
20d Qtr 6/11/2020 <1.0 <1.0 <1.0 <1.0 49.0 <0.1
3rd Qtr 9/17/2020 <1.0 <1.0 <1.0 <1.0 48.8 <0.1
11) As of March 2012 both north and south wild lde ponds no longer receiv
NA = not analyzed Shaded indicates concentrations exceeding GWQS. J = Approximated value.
TABLE 1 (25 of 31)
Historic Summary Of Monitoring Well Analytical Results Up To The 3rd Qarter 2020
Chloroform Contamination Investigation
DUSA White Mesa Mill
1W4-24
(nitrate pumping well started 1/26/13)
Sampling Event
Parameter
(GWQS)
Carbon Tetrachloride
(5 pg/L)
Chloroform
(70 pg/L)
Chloromethane
(30 pg/L)
Methylene Chloride
(5 pg/L)
Chloride
No GWQS (mg/L)
Nitrate, Nitrate + Nitrite
(10 mg/L)
2nd Qtr 6/27/2007 <1.0 2.6 <1.0 <1.0 .. . 770 26.1 3rd Qtr 8/15/2007 <1.0 2.2 <1.0 <1.0 . ... 791 29 41h Qtr 10/10/2007 <1.0 1.5 <1.0 <1.0 692 24.7 1st Qtr 3/28/2008 . .„. <1.0 1.5 <1.0 <1.0 740 24.4 2nd Qtr 6/25/2008 <1.0 1.4 <1.0 <1.0 834 45.3 3rd Qtr 9/10/2008 <1.0 , 2.9 <1.0 <1.0 1,180 ..84 4th Qtr 10/15/2008 NA NA NA NA 1,130 44.8 11/18/2008 <2.0 <2.0 <2.0 <2.0 NA NA 1st Qtr 3/4/2009 <1.0 1.4 <1.0 <1.0 1,010 30.5 2nd Qtr 6/23/2009 <1.0 1.5 <1.0 <1.0 759 , 30.4 3rd Qtr 9/14/2009 <1.0 1.4 <1.0 <1.0 618 30.7 4th Qtr 12/16/2009 <1.0 1.2 <1.0 <1.0 1 080 28.3 1st Qtr 3/25/2010 <1.0 1.3 <1.0 <1.0 896 33.1 2nd Qtr 6/14/2010 <1.0 1.7 <1.0 <1.0 639 30 3rd Qtr 8/24/2010 <1.0 1.8 <1.0 <1.0 587 31 4th Qtr 10/15/2010 <1.0 1.4 <1.0 <1.0 522 31 1st Qtr 2/16/2011 <1.0 1.8 <1.0 <1.0 1,100 31 2nd Qtr 6/14/2011 <1.0 1.1 <1.0 <1.0 1,110 35 3rd Qtr 8/16/2011 <1.0 1.7 <1.0 <1.0 967 34 4th Qtr 11/15/2011 NA NA NA NA 608 35 (1) 12/7/2011 <1.0 1.2 <1.0 <1.0 NA NA lit...tar (2Y i/16/2012
..2nd Qtr 6/6/2012
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0 ..._ ,.. <1.0 . .
373
355
37
3i 3rd Qtr 8/30/2012 <1.0 <1.0 <1.0 <1.0 489 37 4th Qtr 10/3/2012 <1.0 1 <1.0 <1.0 405 38 '1st Qtr (3) 2/11/2013 <1.0 1 <1.0 <1.0 1,260 35.6 2nd Qtr , 6/5/2013 <1.0 17.4 <1.0 <1.0 916 23.7 3M Qtr 8/30/2013 <1.0, 21.8 <10 <1.0 998 33 4th Qtr 10/29/2013 <1.0 32.5 <1.0 <1.0 ....1..,.c.0 35 1st Qtr 1/27/2014 1.18 78.5 <1.0 <1.0 809 31.6 2nd Qtr 5/19/2014 <1.0 62.7 <1.0 <1.0 1,020 35.0 3rd Qtr 8/11/2014 <1.0 76.3 <1.0 <1.0 1,150 31.5 4th Qtr 10/21/2014 <1.0 25.8 <1.0 <1.0 ..1.,.00 35.7 1st Qtr 3/9/2015 <1.0 49.2 <1.0 <1.0 944 34.6 2nd Qtr , 6/8/2015 <1.0 4.28 <1.0 <1.0 1,290 31.8 3rd Qtr 8/31/2015 <1.0 46.9 <1.0 <1.0 788 25.3 4th Qtr 10/19/2015 <1.0 25.3 <1.0 <1.0 909 29.6 ........... 1st Qtr 3/9/2016 <1.0 22.8 <1.0 <1.0 989 ---- 29.1 2nd Qtr 5/23/2016 <1.0 69.6 <1.0 <1 771 , 24.2 3rd Qtr 7/25/2016 <1.0 17.8 <1.0 <1.0 1,180 34.4 4th Qtr 10/12/2016 <1.0 20.8 <1.0 <1.0 .19.10 31.9 1st Qtr 3/8/2017 <1.0 18.3 <1.0 , , <1.0 1,090 41.3
2nd Qtr 6/13/2017 <1.0 17.2 <1.0 - <1.0 1,080 39.9 3rd Qtr 7/26/2017 <1.0 17.8 <1.0 <1.0 1,230 40.0
4th Qtr 10/11/2017 <1.0 16.0 <1.0 <1.0 895 31.7
DWMRC.P.R.P.T.PYt <o. 38 36.0 <0.60 1.3 J 1100 32.0 1st Qtr 3/16/2018 <1.0 24.9 <1.0 <1.0 1,30 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 33.6 4th Qtr 11/28/2018 <1.0 21 <1.0 <1.0 1,100 38.4 DWMRC spat ssestpts <6.0 60 <5.0 <5.0 1,000 1st Qtr 3/8/2019
2nd Qtr 6/5/2019
<1.0
<1.0 , 28.1
28.8
<1.0
<•tjt
<1.0
<1.0 1:040 1,020 39.
33.2 3rd Qtr 9/4/2019 <1.0 31.1 <1.6 <1.0 1,130 36.4 4th Qtr 12/10/2019 <1.0 43.3 <1.0 <1.0 1 090 33.8 1st Qtr 2/19/2020 <1.0 „ 61.7 <1.0 <1.0 1,010 37.1
2nd Qtr 5/27/2020 <1.0 49.4 <1.0 <1.0 1,060 41.7 3rd Qtr 9/4/2020 <1.0 63.8 <1.0 <1.0 1,100 39.1
(1) VOCs were resampled because laboratory missed holding tvne. (2) As of March 2012 both north and south wild life ponds no longer receiving water.
jaChloroformjumiag well started 1/26/13.
NA = not analyzed
Shaded indicates concentrations exceeding GWOS.
J = Approximated value
TABLE 1 (26 of 31)
Historic Summary Of Monitoring Well Analytical Results Up To The 3rd Qarter 2020 Chloroform Contamination Investigation DUSA White Mesa Mill
1W4-25 (n6rate pumping well started 1/26/13)
Sampling Event
Parameter
(GWQS)
Carbon Tetrachloride
(5 pg/L)
Chloroform
(70 pg/L)
Chloromethane
(30 pg/L)
Methylene Chloride
(5 pg/L)
Chloride
No GWQS (mg/L) Nitrate, Nitrate + Nitrite (10 mg/L) 2nd Qtr , 3r6 dtr
4th Qtr
1st Qtr
2nd Qtr
3rd Qtr
4th Qtr
1st Qtr
2nd Qtr 3rd Qtr 4th Qtr 1st Qtr 2nd Qtr 3rd Qtr 4th Qtr 1st Qtr 2nd Qtr 3rd Qtr
4th Qtr
1-if OfF(2).... -2nd Qtr 3rd Qtr 4th Qtr '1st Qtr (3)
2nd Qtr 3rd Qtr 4th Qtr 1st Qtr 2nd Qtr 3rd Qtr 4th Qtr 1st Qtr 2nd Qtr 3rd Qtr
4,i.l..gi..... 1st Qtr
2nd Qtr
3rd Qtr
4th Qtr
1st Qtr
2nd Qtr 3rd Qtr 4th Qtr 1st Qtr 2nd Qtr 3rd Qtr 4th Qtr 1st Qtr 2nd Qtr
3rd Qtr
4th Qtr
lst Qtr
2nd Qtr 3rd Qtr
_6/27/2007
8/15/2007
10/10/2007
3/28/2008
6/25/2008
9/10/2008
10/15/2008
11/18/2008
3/4/2009
6/23/2009
9/14/2009 12/16/2009 3/23/2010 6/14/2010 8/10/2010 10/15/2010 2/16/2011 5/25/2011 8/16/2011
11/15/2011 vi 6/2012
5/31/2012 9/4/2012 10/3/2012 2/11/2013
6/5/2013 9/4/2013 10/31/2013 1/27/2014 5/19/2014 8/11/2014 10/21/2014 3/9/2015 6/8/2015 8/31/2015 10/19/2015 3/9/2016
5/23/2016
7/5/2016
10/12/2016
3/8/2017
_ , 6/13/2017 7/26/2017 10/11/2017 3/12/2018 , 6/14/2018 8/22/2018 11/28/2018 3/8/2019 6/5/2019
9/4/2019
12/10/2019
2/19/2020
5/27/2020 9/4/2020
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
NA
<2.0
<1.0
<1.0
<1.0 <1.0 <1.0 <1.0 <1.0 <1.0 <1.0 <1.0 <1.0
<1.0 <1.0
<1.0 , <1.0 <1 0 <1.0
<1.0 <1.0 <1.0 <1.0 <1.0 <1.0 <1.0 <1.0 <1.0 <1.0 <1.0 <1.0
<1.0
<1.0
<1.0
<1.0
<1.0 <1.0 <1.0 <1.0 <1.0 <1.0 <1.0 <1.0 <1.0
<1.0
<1.0
<1.0
<1.0 <1.0
<1.0
<1.0
<1.0
<1,.0
<1.0
NA
<2.0
<1.0
<1.0
<1.0 <1.0 <1.0 <1.0 <1.0 <1.0
<1.0 <1.0
<1.0 <1.0
<1.0 <1.0 <1.0 -<1.0
<1.0
<1.0 <1.0 <1.0 <1.0 <1.0 <1.0 <1.0 <1.0 <1.0 <1.0 <1.0
<1.0
<1.0
<1.0
1.15
<1.0 <1.0 <1.0 1.15 <1.0 <1.0 <1.0 <1.0 <1.0
<1.0
<1.0
<1.0
<1.0 <1.0
. 2.2
1.8
<1.0 „ <1.0 <1.0 <1,6 <1.0 <1.0
NA
<2.0
<1.0
<1.0
<1.0 <1.0 <1.0 <1.0 <1.0 <1.0 <1.0 <1.0 <1.0
<1.0 <1.0
<1.0 <1.0 <1 0 <1.0
<1.0
<1.0
<1.0
<1.0, <1.0 <1.0 <1.0 <1.0 <1.0 <1.0 <1.0 <1.0
<1.0
<1.0
<1.0
<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
NA
<2.0
<1.0
<1.0
<1.0 <1.0 <1.0 <1.0 <1.0 <1.0 <1.0 <1.0 <1.0
<1.0
<1.0 • <1.0 <1 0 <1.0
<1.0
<1.0
<1.0
<1.0 <1.0 <1.0 <1.0 <1.0 <1.0 <1.0 <1.0 <1.0
<1.0
<1.0
<1.0
<1.0
<1.0 <1.0 <1.0 <1.0 <1.0 <1.0 <1.0 <1.0 <1.0
<1.0
<1.0
<1.0
<1.0 <1.0
NA
395 382 358 374 344 333 366
332 .. . 328
328
371
296
306
250
.3.1..2 316. 321 276 294 304
287
334 338 190
136
119
88.6
85.7 51.1 67 58.1
310
58.3
69.2
62.7 75.5
74.1
59.8
285
69.8
70.,1 66.0
70.5 60.3 .. „„. 69.1 59.7 65 59 58.1 78.1 86.0
76.8,
67.3
17.1
9 17 18.7 22.1 18.8 21.3
93.7
NA
15.3
15.3 3.3
14.2
14.4
16
14
15 15 16
, 16 16 16
16
17 17 9.04
5.24
5.69
6.1
2.18
1.21 1.6 1.03
14.4 1.14 1.63 1.78 0.837 0.959 1.78
1.24
17.0
0.976 „„. 1.23
......1.29 2.28 1.14 0.810 0.634 0.639 0.821 0.548
..g.:.§.41. 0.607 0.851
0.994
(1) VOCs were resampled because laboratory missed holding time. (2) As of March 2012 both north and south wild hfe ponds no longer receiving water.
Chlo rof o r m_pu mita well started 1/26/13
NA = not analyzed Shaded indicates concentrations exceeding GWQS.
TABLE 1 (27 of 31)
Historic Summary Of Monitoring Well Analytical Results Up To The 3rd Qarter 2020
Chloroform Contamination Investigation
DUSA White Mesa Mill
TW4-26
Sampling Event
Parameter
(GWQS)
Carbon Tetrachloride
(5 ug/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 6/14/2010 <1.0 13 <1.0 <1.0 33 7.9 3rd Qtr 8/24/2010 <1.0 5.2 <1.0 <1.0 17 9.0 4th Qtr 10/15/2010 <1.0 5.4 <1.0 <1.0 22 9.6
1st Qtr 2/16/2011 <1.0 2 , <1.0 <1.0 30 10.0
2nd Qtr 5/26/2011 <1.0 2.9 <1.0 <1.0 15 10.0
3rd Qtr 8/17/2011 <1.0 2.8 <1.0 <1.0 19 11.0
4th Qtr 11/16/2011 NA NA NA NA 26 10.0

. 0) 12/7/2011

.
Tiftiti.Th 1/18/2012
<1.0
<1.0
5.2
7
<1.0
<1.0
<1.0 NA NA ............. 11.0
2nd Qtr 6/6/2012 <1.0 4.1 <1.0 <1.0 19 12.0
3rd Qtr 9/11/2012 <1.0 4.9 <1.0 <1.0 19 9.0 4th Qtr 10/3/2012 1st Qtr 2/11/2013
<1.0
<1.0
4.9
4.9
<1.0
<1.0
<1.0
<1.0 19 16.6 .............._______ 12.0
12.5 2nd Qtr 6/13/2013 <1.0 2.12 <1.0 <1.0 14.5 13.6 3rd Qtr 9/5/2013 <1.0 2.81 <1.0 <1.0 17.6 11.7 4th Qtr 11/7/2013 <1.0 3.37 <1.0 <1.0 15.9 15.9 1 st cw 1/29/2014 <1.0 143 <1.0 <1.0 16.9 14.2
2nd Qtr 5/21/2014 <1.0 4.23 <1.0 , <1.0 15.4 12.5
3rd Qtr 8/11/2014 <1.0 1.3 <1.0_ <1.0 15 10.8
4th Qtr 10/28/2014 <1.0 2.45 <1.0 <1.0 14.6 .... .:12,
1st Qtr 3/12/2015 <1.0 2.37 <1.0 <1.0 14.4 1:1.4
2nd Qtr 6/10/2015 <1.0 6.12 1.17 <1.0 14.4 11.3
3rd Qtr 9/3/2015 <1.0 4.77 <1.0 <1.0 14 14.2
4th Qtr 10/28/2015 <1.0 3.45 <1.0 <1.0 13 3 13.9
1st Qtr 3/16/2016 <1.0 1.8 <1.0 <1.0 13.7 ----- 16.9
2nd Qtr 5/26/2016 <1.0 8.23 <1.0 <1.0 15.2 13.9 3rd Qtr 8/3/2016 <1.0 4.42 <1.0 <1.0 13.9 , 17.9 4th Qtr 10/20/2016 <1.0 19.9 <1.0 <1.0 14.2 15.0 1st Qtr 3/16/2017 <1.0 46.1 <1.0 <1.0 16.2 15.8 2nd Qtr 6/20/2017 <1.0 244 <1.0 <1.0 19 15.2 3rd Qtr 8/3/2017 <1.0 419 <1.0 <1.0 25.8 15.2 4t6 Qtr 10/11/2017 <1.0 608 <1.0 <1.0 27.3 10.0
1st Qtr 3/21/2018 <1.0 1,050 <1.0 <1.0 35.5 12.2
2nd Qtr 6/14/2018 <1.0 960 <IL) <1.0 33.5 13.2
3rd Qtr 9/6/2018 <1.0 916 <1.0 <1.0 38.9 13.5
4th Qtr 12/13/2018 <1.0 1 050 <1.0 <1.0 33.4 11.8 1st Qtr 3/20/2019 <1.0 963 <1.0 <1.0 32.9 12.2 2nd Qtr 6/5/2019 <1.0 1,070 <1.0 <1.0 35.8 12.6
3rd Qtr 9/12/2019 <1.0 877 <1.0 <1.0 32.0 10.9 4th Qtr 12/18/2019 <1.0 1,270 <1.0 <1.0 38.3 10.3 1st Qtr 3/18/2020 <1.0 -1,090 <1.0 <1.0 36.3 11.9
2nd Qtr 6/12/2020 <1.0 1,140 <1.0 <1.0 35.1 11.1
3rd Qtr 9/19/2020 <1.0 1120 <1.0 <1.0 34.8 10.5
TW4-27 Tif OEM 1/18/2012 <1.0 9 <1.0 <1.0 11 24.0
-2n8 Qtr 6/13/2012 <1.0 'Z1.0 <1.0 <1.0 17 41.0
3rd Qtr 9/4/2012 <1.0 <1.0 <1.0 <1.0 21 37.0
4th Qtr 10/3/2012 <1.0 <1.0 <1.0 <1.0 18 36.0
1st Qtr 211/2013 <1.0 <1.0 <1.0 <1.0 18.8 31.2
2nd Qtr 6/13/2013 <1.0 <1.0 <1.0 <1.0 20.3 29.4
3rd Qtr 8/30/2013 <1.0 <1.0 <1.0, <1.0 19 27.2
4th Qtr 11/6/2013 <1.0 <1.0 <1.0 <1.0 21.8 29.8
1st Qtr 1/23/2014 <1.0 <1.0 <1.0 <1.0 31.8 31.3
2nd Qtr 5/21/2014 <1.0 <1.0 <1.0 <1.0 20.6 31.1
3rd Qtr 8/13/2014 <1.0 <1.0 <1.0 <1.0 23 27.0 4th Qtr 10/28/2014 <1.0 <1.0 <1.0 <1.0 24.4 28.2 1st Qtr 3/11/2015 <1.0 <1.0 <1.0 <1.0 26.2 , 26.5 2nd Qtr 6/10/2015 <1.0 <1.0 <1.0 <1.0 26.8 24.0 3rd Qtr 9/2/2015 <1.0 1.3 <1.0 <1.0 26.8 20.9
4th Qtr 10/28/2015 <1.0 1.6 <1.0 <1.0 26 2 23 5
1st Qtr 3/16/2016 <1.0 2.11 <1.0 <1.0 28 25.0
2nd Qtr 5/26/2016 <1.0 3.16 <1.0 <1.0 21.2 28.7
3rd Qtr 6/3/2016 <1.0 2.78 <1.0 <1.0 27.1 21.8
4th Qtr 10/20/2016 <1.0 3.8 <1.0 <1.0 ..... .... _19.3
1st Qtr ,3/15/2017 <1.0 4.33 <1.0 <1.0 28.3 Ifi
2nd Qtr 6/15/2017 <1.0 5.65 <1.0 <1.0 27.9 23.8
3rd Qtr 8/2/2017 <1.0 6.05 <1.0 <1.0 29.5 20.0 4th Qtr 10/10/2017 <1.0 5.91 <1.0 <1.0 26.3 21.5 1st Qtr 3/14/2018 <1.0 6.95 <1.0 <1.0 30.3 19.5 2nd Qtr 6/13/2018 <1.0 5.95 <1.0 <1.0 28.3 22.0 3rd Qtr 8/30/2018 <1.0 7.35 <1.0 <1.0 31.4 18.1
4th Qtr 12/12/2018 <1.0 7.7 <1.0 <1.0 28.2 _............. 20,8
1st Qtr 3/16/2019 <1.0 6.54 <1.0 <1.0 26.2 21.6
2n6 Qtr 6/13/2019 <1.0 8.24 <1.0 <1.0 28.6 22.3
3rd Qtr 9/11/2019 <1.0 7.58 <1.0 <1.0 25.3 21.2
4th Qtr 12/14/2019 <1.0 7.97 <1.0 <1.0 27.4 22.0
1st Qtr 3/18/2020 <1.0 8.04 <1.0 <1.0 27.6 23.6
2nd Qtr 6/11/2020 <1.0 7.92 <1.0 <1.0 28.0 21.5 3rd Qtr 9/18/2020 <1.0 5.62 <1.0 <1.0 26.2 25.2
(1) VOCs were resampled because laboratory missed holding time. (2) As of tv- wild life ponds no longer receiving water.
NA = not analyzed
Shaded indicates concentratons exceeding GWQS.
TABLE 1 (28 of 31)
Historic Summary Of Monitoring Well Analytical Results Up To The 3rd Qarter 2020
Chloroform Contamination Investigation
DUSA White Mesa Min
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)
2nd Qtr 6/19/2013 <1.0 <1,0 <1.0 <1.0 6 44. . . 14.9 3rd 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 2nd Qtr 5/21/2014 <1.0 <1.0 <1.0 <1.0 45.7 16.5
3rd 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 .....1.5 1st Qtr 3/11/2015 <1.0 <1.0 <1.0 <1.0, 52.2 19.6
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
4th Qtr 10/21/2015 <1.0 <1.0 <1.0 <1.0 52.7 ______ 18.7
1st Qtr 3/15/2016 <1.0 <1.0 <1.0 <1.0 61.6 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 14th Qtr 10/19/2016 <1.0 <1.0 <1.0 <1.0 70.9 25.5 pmptipate TW4-65 <1.0 <1.0 <1.0 <1.0 73.7 25.4
11 st 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 <1.0 <1.0 <1.0 <1.0 68.6 26.0
3rd Qtr 7/27/2017 <1.0 <1.0 <1.0 <1.0 67.1 24.8
4th dtr 10/10/2017 <1.0 <1.0 <1.0 <1.0 57.4 24.8
1st Qtr 3/14/2018 <1.0 <1.0 <1.0 <1.0 66,0 17.2
2nd Qtr 6/12/2018 <1.0 <1.0 <1.0 <1.0 55.7 19.0
Duplicate TW4-65 <1.0 <1.0 <1.0 <1.0 56.7 18.7
3rd 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 ...4.. ...1.7,7
1st Qtr 3/16/2019 <1.0 <1.0 <1.0 <1.0 51.7 - 17...2-
2nd Qtr 6/13/2019 <1.0 <1.0 <1.0 <1.0 61.8 15.0 3rd Qtr 9/11/2019 <1.0 <1.0 <1.0 <1.0 49.0 10.2 4th Qtr 12/12/2019 <1.0 <1.0 <1.0 <1.0 50.0 9.48 1st Qtr 3/17/2020 <1.0 <1.0 <1.0 <1.0 52.1 9.87 2nd 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
TW4-29
2nd Qtr 619/2013 <1.0 242 <1.0 <1.0 44.8, 4.60
2nd Qtr 7/ 1/20 3 <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 4th Qtr 11/13/2013 <1.0 260 <1.0 <1.0 42.5 4.11 1st Qtr 2/5/2014 <1.0 258 <1.0 <1.0 14.9 . 4.6
2nd 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 ..164., 1st Qtr 3/12/2015 <1.0 299 <1.0 <1.0. 40.5 4.14
2nd 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 10/29/2015 <1.0 631 <1.0 <1.0 39.8 2.74
1st Qtr 3/17/2016 <1.0 335 <1.0 <1.0 40.5 „ „ 2.92
2nd 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
4th 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 2nd 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 37.7 .......2..4 1st Qtr 3/14/2018 <1.0 533 <1.0 <1.0 43.1 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 12/13/2018 <1.0 521 <1.0 <1.0 ........49.:.P.. - ..Z.§.P. lst Qtr 3/20/2019 <1.0 507 <1.0 . <1.0 39.9 2.37
2nd Qtr 6/13/2019 <1.0 537 <1.0 <1.0 39.4 2.56 3rd Qtr 9/12/2019 <1.0 549 <1.0 <1.0 36 2.55
4,P..P.Ir_.... ..1.2/..181.20.19....1.9......... lstQtr 3/18/2020 <1.0 630 <1.0 <1.0 <1.0 <1.0 44.8 41 ........3., 3.10 652 2nd Qtr 6/12/2020 <1.0 686 <1.0 <1.0 42.2 3.18 3rd Qtr 9/19/2019 <1.0 621 <1.0 <1.0 39.9 2.90
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 2nd Qtr 6/22/2014 <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 36 1.5
4th Qtr 10/23/2014 <1.0 <1.0 <1.0 <1.0 37.1 1.84
1st Qtr 3/11/2015 <1.0 1.65 <1.0 <1.0 38.3 2.15
2nd Qtr 6/11/2016 <1.0 2.25 <1.0 <1.0 40.3 1.75
3rd Qtr 9/3/2015 <1.0 3.27 <1.0 <1.0 44.2 1.75
4th Qtr 10/28/2015 <1.0 3.48 <1.0 <1.0 37.8 1.86
1st Qtr 3/17/2016 <1.0 5,16 <1.0 <1.0 39.6 2.74
2nd Qtr 5/26/2016 <1.0, 7.38 <1.0 <1.0 ' 40.2 2.04 3rd Qtr 8/3/2016 <1.0 6.79 <1.0 <1.9, 38.6 2.32 4th Qtr 10/20/2016 <1.0 8.69 <1.0 <1.0 41.3 2„61
1st Qtr 3/15/2017 <1.0 13.6 <1.0 <1.0 37.7 iff.i
2nd Qtr 6/15/2017 <1.0 15.2 <1.0 <1.0 37.8 2.95
3rd Qtr 8/3/2017 <1.0 15.7 <1.0 <1.0 39.8 3.11
4th Qtr 10/10/2017 <1.0 13.4 <1.0 <1.0 34.9 .2:.5!.3 1st Qtr 3/15/2018 <1.0 16.4 <1.0 <1.0 41 3.63
2nd Qtr 6/13/2018 <1.0 16.9 <1.0 <1.0 37.4 3.93
3rd Qtr 8/30/2018 <1.0 „ 19.8 <1.0 <1.0 44.1 3.79
4th Qtr 12/12/2018 <1.0 23.9 <1.0 <1.0 35.5 3.70............ 1st Qtr 3/15/2019 <1.0 25.3 <1.0 . . ... <1.0 35.9 4.08 2nd Qtr 6/13/2019 <1.0 31.5 <1.0 <1.0 27.2 4.13
3rd Qtr 9/11/2019 <1.0 34.8 <1.0 <1.0 34.5 3.79
4th Qtr 12/18/2019 <1.0 44.9 <1.0 <1.0 39.1 ......:.§3. 15t Qtr 3/17/2020 <1.0 53.1 <1.0 <1.0 37.5 3.85
2nd Qtr 6/12/2020 <1.0 65.4 <1.0 <1.0 38.6 3.69 3rd Qtr 9/18/2020 <1.0 67.7 <1.0 <1.0 35 3.49
Shaded indlaiss esnosaintions assedir. GYM.
TABLE 1 (29 of 31)
Historic Summary Of Monitoring Well Analytical Results Up To The 3rd Qarter 2020
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
(6 lig/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 4th Qtr 11/7/2013 <1.0 <1.0 <1.0 <1.0 1st Qtr 1/23/2014 <1.0 <1.0 <1.0 <1.0 28.5 1.32 2nd Qtr 5/21/2014 <1.0 <1.0 <1.0 <1.0.. 26.3 1.22 3rd Qtr 8/13/2014 <1.0 <1.0 <1.0 <1.0 30 1.1 4th Qtr 10/28/2014 lst Qtr 3/11/2015 <1.0 <1.0 <1.0 <1.0 <1.0
<1.0
<1.0
<1.0 , 37.1 30.6 ......184 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 <1.0 <1.0 <1.0 <1.0 31.5 1.84 2nd Qtr 5/25/2016 <1.0 <1.0 <1.0 <1.0 32.5 1.36 3rd Qtr 7/28/2016 <1.0 <1.0 <1.0 <1.0 30.6 1.41 4th Qtr 10/20/2016 <1.0 <1.0 <1.0 <1.0 34 ......j.,14 l st Qtr 3/15/2017 <1.0 . ... <1.0 <1.0 <1.0 31.3 1,19 2nd Qtr 6/15/2017 <1.0 <1.0 <1.0 <1.0 33.4 1.21 3rd Qtr 8/2/2017 <1.0 . ... . <1.0 <1.0 <1.0 33 1.11 4th Qtr 10/10/2017 <1.0 <1.0 <1.0 <1.0 30.9 1.04 1st Qtr 3/14/2018 <1.0 <1.0 <1.0 <1.0 38.8 0.916 2nd Qtr 6/12/2018 <1.0 <1.0 <1.0 <1.0 34.4 0.948 3rCI Qtr 8/29/2018 <1.0 <1.0 .. <1.0 <1.0 40.3 0.710 4th Qtr 12/12/2018 <1.0 <1.0 <1.0 <1.0 35.2 0.766 1st Qtr 3/16/2019 <1.0 <1.0 <1.0 .„.„.. .. ... <1.0 35 0.754 2nd Qtr 6/13/2019 <1.0 <1.0 <1.0 <1.0 . 66,9 0.713 3rd Qtr 9/11/2019 <1.0 <1.0 <1.0 <1.0 35.8 0.61. 4th Qtr 12/14/2019 <1.0 <1.0 <1.0 <1.0 40.6 0.58 1st Qtr 3/17/2020 <1.0 <1.0.. <1.0 <1.0 38.2 0.572 2nd Qtr 6/12/2020 <1.0 <1.0 <1.0 <1.0 36.7 , , 0.569 3rd Qtr 9/17/2020 <1.0 <1.0 <1.0 <1.0 35.5 0.51 TW4-32
4th Qtr 11/14/2013 <1.0 <1.0 <1.0 <1.0 52.1 4.26 1st Qtr 1/22/2014 <1.0 <1.0 <1.0 <1.0 54.5 5.11 2nd Qtr 5/21/2014 <1.0 <1.0 <1.0 <1.0 54.9 5.63 3rd Qtr 8/13/2014 <1.0 . <1.0 <1.0 <1.0 64 4.2 4th Qtr 10/23/2014 <1.0 <1.0 <1.0 <1.0 62.6 2.14 1st Qtr 3/11/2015 <1.0 <1.0 <1.0 <1.0 64.2 2.46 Duplicate TW4-65 <1.0 <1 <1.0 <1.0 .6.9 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 4t6 Qtr 10/21/2015 <1.0 <1.0 <1.0 <1.0 55.1 1.19 1st Qtr ..... 3/15/2016 <1.0 <1.0 <1.0 <1.0 64.2 4.48 ' 2nd Qtr 5/25/2016 <1.0 <1.0 <1.0 <1 0 71.8 3.16 3rd Qtr 7/28/2016 <1.0 <1.0 <1.0 <1.0 64.4 3.44 4th Qtr 10/19/2016 <1.0 <1.0 <1.0 <1.0 66 2.8-7 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 6.8 2.47 4th Qtr 10/10/2017 <1.0 <1.0 <1.0 <1.0 65.8 2.47 1st Qtr 3/14/2018 <1.0 <1.0 <1.0 <1.0 65.4 2.94 2nd Qtr 6/12/2018 <1.0 <1.0 <1.0 <1.0 59.2 2.51 3rd Qtr 8/29/2018 <1.0 <1.0 <1.0 <1.0 68.1 2.56 4th Qtr 11/30/2018 <1.0 <1.0 <1.0 <1.0 57.5 .....2:59 l st Qtr 3/16/2019 <1.0 <1.0 <1.0 <1.0 57.5 2.15 2nd 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 4th Qtr 12/14/2019 <1.0 <1.0 <1.0 <1.0 64.7 1.89 1st Qtr 3/17/2020 <1.0 <1.0 <1.0 <1.0 59.7 1,97 2nd Qtr 6/10/2020 <1.0 <1.0 <1.0 <1.0 57.0 2.19 3rd Qtr 9/17/2020 <1.0 <1.0 <1.0 <1.0 50.8 1.58 TW4-33 4th Qtr 11/14/2013 <1.0 126 <1.0 <1.0 4.7.,.. .182 l st Qtr 1/30/2014 <1.0 124 <1.0 <1.0 43.5 256 2nd Qtr 5/22/2014 <1.0 121 <1.0 <1.0 46.8 1.63 3rd Qtr 8/27/2014 <1.0 104 <1.0 <1.0 43 1.50 4th Qtr 10/29/2014 <1.0 124 <1.0 <1.0 44.2 2.22 1st Qtr 3/12/2015 <1.0 134 <1.0 <1.0 44.2 1.91 2nd Qtr 6/11/2015 <1.0 127 <1.0 <1.0 46.6 1.62 3rd Qtr 9/3/2015 <1.0 123 <1.0 <1.0 53.3 1.64 41n Qtr 10/29/2015 <1 0 129 <1 0 <1 0 44 5 1 6 1st Qtr 3/17/2016 <1.0 122 <1.0 <1.0 46.2 2.13 2nd Qtr 6/8/2016 <1.0 96.1 <1.0 <1.0 49.7 2.06 3rd Qtr 8/4/2016 <1.0 121 <1.0 <1.0. 48.5 2.32 4th Qtr 10/26/2016 <1.0 109 <1.0 <1.0 52.4 ................ .2:.9. 1st Qtr 3/17/2017 <1.0 90.7 <1.0 <1.0 49.0 2.11 2nd Qtr 6/20/2017 <1.0 103 <1.0 <1.0 49.2 2.34 3rd Qtr 8/3/2017 <1.0 . 127 <1.0 <1.0 46.9 2.04 4th Qtr 10/11/2017 <1.0 97.1 <1.0 <1.0 42.5 ...2..0.9: 1st Qtr 3/15/2018 <1.0 128 <1.0 <1.0 49.2 1.94 2nd Qtr 6/13/2018 <1.0 87.8 <1.0 <1.0 44.0 2.13 3rd Qtr 9/5/2018 <to, 113 <1 0 . , <1.0 50.0 1.82 4th Qtr 12/13/2018 <1.0 141 <1.0 <1.0 43.2 2.01 1st Qtr 3/20/2019 <1.0 86.2 <1.0 <1.0 47.2 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 4th Qtr 12/18/2019 <1.0 117 <1.0 <1.0 48.8 1.86 • 1st Qtr 3/18/2020 <1.0 93.7 <1.0 <1.0 ..... . 45.3 2.44 2nd Qtr 6/10/2020 <1.0 90.1 <1.0 <1.0 48.9 3.26 3rd Qtr 9/18/2020 <1.0 84.9 <1.0 <1.0 51.0 3.58
Shaded indicates concentrations exceeding GWQS.
TABLE 1 (30 of 31)
Historic Summary Of Monitoring Well Analytical Results Up To The 3rd Qarter 2020
Chloroform Contamination investigation
DUSA White Mesa Mill
TW4-34 Parameter Samphng Event (GWQS) Carbon Tetrachloride Chloroform Chloromethane Methylene Chloride Chloride Nitrate, Nitrate + Nitrite
(5 pg/L) (70 pg/L) (30 pg/L) (5 pg/L) No GWQS (mg/L) (10 mg/L)
4th Qtr 11/14/2013 <1 0 <1 0 .. <1.0 <1 0 19 2 1 64 1st Qtr 1/23/2014 <1 0 <1 0 <1 0 <1 0 20 4 1 93 2nd Qtr 5/22/2014 <1 0 <1 0 <1 0 <1 0 17 9 1 69 3rd Qtr 8/13/2014 <1 0 <1 0 <1 0 <1 0 18 1 10
4th Qtr 10/29/2014 .<1 0 <1 0 <1 0 <1 0 17 8. 1 16 1st Qtr 3/11/2015 <1 0 <1 0 <1 0 <1 0 17 7 1 21 2nd Qtr 6/11/2015 <1 0 <1 0 <1 0 <1 0 17 4 0 868 3rd Qtr 9/3/2015 <1 0 <1 0 <1 0 <1 0 15 1 0 458 4th Qtr 10/21/2015 <1 0 <1 0 <1 0 <1 0 15 8 0 368 1st Qtr 3/16/2016 <1 0 <1 0 <1 0 <1 0 17 3 0 925 2nd Qtr 5/25/2016 <1 0 <1 0 <1 0 <1 0 18 0 605 3rd Qtr 8/3/2016 <1 0 <1 0 <1 0 <1 0 17 2 0 726 4th Qtr 10/20/2016 .<1 0 <1 0 <1 0 <1 0 19 0 612 1st Qtr 3/15/2017 <1 0 <1 0 <1 0 <1 0 18 0 0 674 2nd Qtr 6/15/2017 <1 0 <1 0 <1 0 <1 0 15 7 0 727 3rd Qtr 8/2/2017 <1 0 <1 0 <1 0 <1 0 19 8 0 733 4th Qtr 10/10/2017 <1 0 <1 0 <1 0 <1 0 18 5 0 774 Duplicate TW4-65 <1 0 <1 0 <1 0 <1 0 20 4 0 784
1st Qtr 3/14/2018 <1 0 <1 0 <1 0 <1 0 19 1 0 737 2nd Qtr 6/13/2018 <1 0 <1 0 <1 0 <1 0 19 5 0 877
3rd Qtr 8/29/2018 <1 0 <1 0 <1 0 <1 0 23 8 0 736
4th Qtr 12/12/2018 0 .<1 <1 0 <1 0 <1 0 18 5. 0 889
1st Qtr 3/16/2019 <1 0 <1 0 <1 0 <1 0 17 9 0 859
2nd Qtr 6/13/2019 <1 0 <1 0 <1 0 <1 0 20 1 0 994 3rd Qtr 9/11/2019 <1 0 <1 0 <1 0 <1 0 17 8 0 934 4th Qtr 12/14/2019 <1 0 <1 0 <1 0 <1 0 21 4 1 07 1st Qtr 3/17/2020 <1 0 <1 0 <1 0 <1 0 20 1 1 090 2nd Qtr 6/10/2020 <1 0 <1 0 <1 0 <1 0 20 9 1 240 3rd Qtr 9/17/2020 <1 0 <1 0 <1 0 <1 0 19 0 0 978
TW4-35
3rd Qtr 8/27/2014 <1 0 <1 0 <1 0 <1 0 34 0 2
4th Qtr 10128/2014 <1 0 <1 0 <1 0 0 .<1 34 1 0 351
1st Qtr 3/11/2015 <1 0 <1 0 <1 0 <1 0 34 9 0 436
2nd Qtr 6/10/2015 <1 0 <1 0 <1 0 <1 0 35 2 0 452
3rd Qtr 9/3/2015 <1 0 <1 0 <1 0 <1 0 35 9 0 304 4th Qtr 10/28/2015 <1 0 <1 0 <1 0 <1 0 33 4 0 419 1st Qtr 3/16/2016 <1 0 <1 0 <1 0 <1 0 35 4 0 521 2nd Qtr 5/26/2016 <1 0 <1 0 <1 0 <1 0 35 4 0 631 3rd Qtr 8/3/2016 <1 0 <1 0 <1 0 <1 0 34 8 0 723 4th Qtr 10/20/2016 0 .<1 <1 0 <1 0 <1 0 37 1 0 626 1st Qtr 3/15/2017 <1 0 <1 0 <1 0 <1 0 33 7 0 673 2nd Qtr 6/15/2017 <1 0 <1 0 <1 0 <1 0 34 8 0 699
3rd Qtr 8/2/2017 <1 0 <1 0 <1 0 <1 0 36 3 0 670
4th 10/10/2017 .Qtr 0 .<1 <1 0 <1 0 <1 0 31 7 0 651 1st Qtr 3/14/2018 <1 0 <1 0 <1 0 <1 0 37 4 0 740 2nd Qtr 6/13/2018 <1 0 <1 0 <1 0 <1 0 33 7 0 662 3rd Qtr 8/30/2018 <1 0 <1 0 <1 0 <1 0 39 3 0 527 4th Qtr 12/12/2018 0 .<1 <1 0 <1 0 <1 0 43 0 0 559 1st Qtr 3/16/2019 <1 0 <1 0 <1 0 <1 0 33 5 0 574 2nd Qtr 6/13/2019 <1 0 <1 0 <1 0 <1 0 35 5 0 670 3rd Qtr 9/11/2019 <1 0 <1 0 <1 0 <1 0 31 7 0 525 4th Qtr 12/14/2019 <1 0 <1 0 <1 0 <1 0 37 4. 0 524 1st Qtr 3/17/2020 <1 0 <1 0 <1 0 <1 0 34 5 0 595 2nd Qtr 6/11/2020 <1 0 <1 0 <1 0 <1 0 34 0 0 699 3rd Qtr 9/17/2020 <1 0 <1 0 <1 0 <1 0 32 2 0 760
TW4-36
3rd Qtr 8/27/2014 <1 0 <1 0 <1 0 <1 0 65 <0 1
4th Qtr 10/23/2014 <1 0 <1 0.. <1 0 <1 0 67 3 <0 1
1st Qtr 3/11/2015 <1 0 <1 0 <1 0 <1 0 67 2 <0 1
2nd Qtr 6/10/2015 <1 0 <1 0 <1 0 <1 0 69 3 <0 1
3rd Qtr 9/3/2015 <1 0 <1 0 <1 0 <1 0 76 4 <0 1
4th Qtr 10/21/2015 <1 0 <1 0 <1 0 <1 0 64 5 <0 1 1st Qtr 3/11/2016 <1 0 <1 0 <1 0 <1 0 67 2 <0 1 2nd Qtr 5/26/2016 <1 0 <1 0 <1 0 <1 0 72 3 <0 1 3rd Qtr 7/28/2016 <1 0 <1 0 <1 0 <1 0 69 4 <0 1 4th Qtr 10/20/2016 <1 0 <1 0 <1 0 <1 0 73 8 <0 1 Duplicate T.W4-70 <1 0 <1 0 <1 0 <1 0 72 <0 1 1st Qtr 3/15/2017 <1 0 <1 0 <1 0 <1 0 60 2 <0 1 2nd Qtr 6/15/2017 <1 0 <1 0 <1 0 <1 0 71 3 <0 1
3rd Qtr 8/2/2017 <1 0 <1 0 <1 0 <1 0 69 6 <0 1
4th Qtr 10/10/2017 0 .<1 <1 0 <1 0 <1 0 62 9 0 104
1st Qtr 3/14/2018 <1 0 <1 0 <1 0 <1 0 73 8 <0 1
2nd Qtr 6/12/2018 <1 0 <1 0 <1 0 <1 0 64 3 <0 1
3rd Qtr 8/29/2018 <1 0 <1 0 <1 0 <1 0 76 4 <0 1
4th Qtr 12/12/2018 0 .<1 <1 0 <1 0 <1 0 65 8 0 123 1st Qtr 3/16/2019 <1 0 <1 0 <1 0 <1 0 65 0 116 2nd Qtr 6/13/2019 <1 0 <1 0 <1 0 <1 0 71 5 <0 1 3rd Qtr 9/11/2019 <1 0 <1 0 <1 0 <1 0 69 6 <0 1 4th Qtr 12/14/2019 0 .<1 <1 0 <1 0 <1 0 73 7 <0 1 1st Qtr 3/17/2020 <1 0 <1 0 <1 0 <1 0 69 1 <0 1 2nd Qtr 6/11/2020 <1 0 <1 0 <1 0 <1 0 67 0 <0 1 3rd Qtr 9/17/2020 <1 0 <1 0 <1 0 <1 0 66 0 <0 1
Shaded indicates concentrations exceeding GWQS
TABLE 1 (31 of 31)
Historic Summary Of Monitoring Well Analytical Results Up To The 3rd Qarter 2020
Chloroform Contamination Investigation
DUSA White Mesa Mill
TW4-37 (chloroform pumping well 6/9/15)
Sampling Event
Parameter
(GWQS)
Carbon Tetrachloride
(5 pg/L)
Chloroform
(70 pg/L)
Chloromethane (30 pg/L) Methylene Chloride
(5 pg/L)
Chloride
No GWQS (mg/L)
Nitrate, Nitrate + Nitrite
(10 mg/L)
2nd Qtr 6/8/2015 18.2 30,200 15.7 1.94 345 35.2
3rd Qtr 8313/2015 16.6 19,100 13.7 1.04 374 32.4
. 4..p_P1L. 10/19/2015 12 5 19 500 9 38 1 17 399 34.6
1 Qtr 3/9/2016 15.8 . . 17,500 3.57 1.34 332 28.4
2nd Qtr 5/23/2016 14,4 16,200 3.57 1.17 389 27.9
3rd Qtr 7/25/2016 16.7 15,900 <1.0 <1.0 294 33.4
4th Qtr 10/12/2016 16.3 16 400 <1.0 <1.0 304 ..... .....261 1st Qtr 3/8/2017 15.4 18,000 3.57 1.34 305 32.3
2nd Qtr 6/15/2017 16.2 15,800 <1.0 <1.0 281 31.2
3rd Qtr 7/26/2017 15.1 .. . 15,000 <1.9 <1.0 277 30.5
4.P.I.gr_ ......1.0/11!.2017. 12.6 15 500 2.47 <1.0 255 30.6 1st Qtr 3/12/2018 12.8 12,900 1.14 <1.0 263 30.0 2nd Qtr 6/8/2018 10.6 14,400 <1.0 <1.0 275 28.6 3rd Qtr 8/22/2018 12.1 14,100 6.2 <1.0 387 25.3
4th Qtr 11/28/2018 11.3 15200 19.8 <1.0 264 27.3 1st Qtr 3/8/2019 13.8 16,300 1.24 <1.0 209 30.1, 2nd Qtr 6/5/2019 14.6 16,200 <1.0 <1.0 250 31.2
3rd Qtr 9/4/2019 10.7 11,900 1.9 <1.0 228 25.8
41h Qtr 12/10/2019 8.81 11100 3.12 <1.0 220 ._... .25.ffir 1st Qtr 2/19/2020 8.53 12,000 12.3 <1.0 236 28.3
2nd Qtr 5/27/2020 11.8 11,700 1.44 <1.00 321 28.3
3rd Qtr 9/4/2020 9.62 13,800 <1.0 <1.0 273 29.5
TW4-38
4th Qtr 11/10/2016 <1.0 <1.0 <1.0 <1.0 40 11.2
1st Qtr 3/15/2017 <1.0 <1.0 <1.0 <1.0 35.7 10.6
2nd Qtr 6/15/2017 <1.0 <1.0 <1.0 <1.0 36.2 10.8
3rd Qtr 8/2/2017 <1.0 <1.0 <1.0 <1.0 36.9 10.1
4th Qtr 10/10/2017 <1.0 <1.0 <1.0 <1.0 31.3 10.3
1st Qtr 3/14/2018 <1.0 <1.0 <1.0 <1.0 36.5 9.34
2nd Qtr 6/13/2018 <1.0 <1.0 <1.0 <1.0 .. . „ 33.1 9.48
3rd Qtr 8/30/2018 <1.0 <1.0 <1.0 <1.0 39.2 7.77
4th Qtr 12/12/2018 <1.0 <1.0 <1.0 <1.0 35.0 8.48
1st Qtr 3/16/2019 <1.0 <1.0 <1.0 <1.0 33.5 8.96
2nd Qtr 6/13/2019 <1.0 <1.0 <1.0 <1.0 33.7 8.53
Duplicate TW4-70 <1.0 <1.0 <1.0 <1.0 35.3 9.52
3rd Qtr 9/11/2019 <1.0 <1.0 <1.0 <1.0 31.6, 7.61
4th Qtr 12/14/2019 <1.0 <1.0 <1.0 <1.0 36 .7,,51, 1st Qtr 3/17/2020 <1.0 <1.0 <1.0 <1.0 33.4 8.11
2nd Qtr 6/11/2020 <1.0 <1.0 <1.0 <1.0 34.9 9.00
3rd Qtr 9/18/2020 <1 0 <1.0 <1.0 <1.0 34.7 7.35
TW4•39(chiorotorrn pumping well
(1112016) 4th Qtr 11/11/2016 <1.0 2 800 <1.0 <1.0 68.9 20.7
1st Qtr 3/8/2017 8.15 6,460 <1.0 1.35 130 , 6.44
2nd Qtr 6/15/2017 8.2 5 , 560 . <1.0 1.31 120 6.25
3rd Qtr 7/26/2017 14.4 10,000 <1.0 1.5 132 7.74
4th Qtr 10/10/2017 <1.0 552 <1.0 ......D.:5. 2.65 ................_ 1st Qtr 3/12/2018 3.1 2,870 <1.0 - <1.6 116 3.33
2nd Qtr 6/8/2018 7.94 7,160 <1.0 <1.0 107 4.84
3rd Qtr 8/22/2018 12.5 8,180 2.33 <1.0 110 6.05
4th Qtr 11/28/2018 6.68 .6.,_5,20 2.33 <1.0 123 6.39
1st Qtr 3/8/2019 1.2 685 <1.0 <1.0 49 2.06
2nd Qtr 6/5/2019 11.6 8,640 <1.0 <1.0 114 8.45 3rd Qtr 9/4/2019 5.71 4,240 <1.0 <1.0 48.2 1.75
4th Qtr 12/10/2019 1.14 ...1.50 <1.0 <1.0 ......14.1 0.95
1st Qtr 2/19/2020 <1.0 81 2 <1.0 <1.0 „ ---0...762 76.5
2nd Qtr 5/27/2020 7.56 5,870 <1.0 <1.0 88.5 5.010 3rd Qtr 9/4/2019 8.18 5,960 <1.0 <1.0 63.21 2.69
TW4-40(chloroform pumping well
512019)
1st Qtr 3/21/2018 <1.0 248 <1.0 <1.0 35.7 3.08
2nd 6/13/2018 ,Qtr <1.0 131 <1.0 <1.0 31.6 3.33
3rd Qtr 9/5/2018 <1.0 116 <1.0 <1.0 37.6 3.22
4th Qtr 12/12/2018 <1.0 118 <1.0 <1.0 29.9 3.54 Duplicate T1N4-75 <1.0 119 <1.0 <1.0 32.3 3.18
1St Qt/ 3/20/2019 <1.0 - 111 <1.0 <1.0 30.9 3.18
Ind Qtr 6/5/2019 <1.0 263 <1.0 <1.0 35.6 3.56 3rd Qtr 9/4/2019 <1.0 380 <1.0 <1.0 , 35.9 3.39 4th Qtr 12/10/2019 <1.0 314 <1.0 <1.0 36.7 .............. 2.89
lst Qtr 2/19/2020 <1.0 364 <1.0 <1.0 38.5 2.98
2nd Qtr 5/27/2020 <1.0 367 <1.0 <1.0 36.5 2.91
3rd Qtr 9/4/2020 <1.0 333 <1.0 <1.0 34.2 2.88
TW4-41(chioroform pumping well
5/2018)
2nd Qtr 5/8/2018 <1.0 1,400 <1.0 <1.0 42.8 6.54
3rd Qtr 8/22/2018 <1.0 1,390 <1.0 <1.0 45.5 6.13
4th Qtr 11/28/2018 <1.0 1320 <1.0 <1.0 41.4 6.02
1st Qtr 3/8/2019 , <1.0 1,220 <1.0 <1.0 39.1 6.71
2nd Qtr 6/5/2019 <1.0 1,320 <1.0 <1.0 38.1 6.00
3rd Qtr 9/4/2019 <1.0 1,190 <1.0 <1.0 39.4 6.22
4th Qtr 12/10/2019 <1.0 1,410 <1.0 <1.0 42.1 6.11 ................... 1st Qtr 2/19/2020 <1.0 1,200 <1.0 <1.0 44.4 6.12
2nd Qtr 5/27/2020 <1.0 1,220 <1.0 <1.0 41.7 6.78
3rd Qtr 9/4/2020 <1.0 1,110 <1.0 <1.0 40.2 6.69
TW4-42
2nd Qtr 6/19/2019 <1.0 <1.0 <1.0 <1.0 23,3 2.57
3rd Qtr 9/11/2019 <1.0 <1,0 <1.0 <1.0 20.6 2.75
4th Otr 12/10/2019 <1.0 <1.0 <1.0 <1.0 22.6 2.82
crIplicate TW4-75 <1 0 <1 0 <1 0 <1 0 22 6 2 95
1st Qtr 2/17/2020 <1.0 <1.0 <1.0 <1.0 23.2 2.88
2nd Qtr 6/10/2020 <1.0 <1.0 <1.0 <1.0 23.2 2.88
3rd Qtr 9/17/2020 <1.0 <1.0 <1.0 <1.0 23.5 3.65
Shaded indicates concentrations exceeding GVVQS. (1) VOCs were resampled because laboratory missed holding time. jaChloroform_puminvell stated in MaL2019.
Tabel 3
Chloroform Mass Removal Calculations for the 3rd Qurater 2020
EFR White Mesa Mill, Bland, Utah
Well ID MW4 MW-26 TW4-1 TW4-2 TW4-4 TW4-11 TW4-19 TW4-21 TW4-22 TW4-24 TW4-25 TW4-37 1W4-39 TW4-40 TW4-41
11)Chloroform (ug/L) 1,240 1,130 1,060 1,260 1,110 3,070 1,350 920 3,760 63.4 0 13,800 5,960 333 1,110 Chloroform (g/L) 1.24E-03 1.13E-03 1.06E-03 1.26E-03 1.11E-03 3.07E-03 1.35E-03 9.20E-04 3.76E-03 6.34E-05 0.00E+00 1.38E-02 5.96E-03 3.33E-04 1.11E-03 Chloroform (lbs/L) 2.74E-06 2.50E-06 2.34E-06 2.78E-06 2.45E-06 6.78E-06 2.98E-06 2.03E-06 8.31E-06 1.40E-07 0.00E+00 3.05E-05 1.32E-05 7.36E-07 2.45E-06 Chloroform (lbs/gal) 1.04E-05 9.45E-06 8.86E-06 1.05E-05 9.28E-06 2.57E-05 1.13E-05 7.69E-06 3.14E-05 5.30E-07 0.00E+00 1.15E-04 4.98E-05 2.78E-06 9.28E-06 Total gallons pumped 84,607.8 23,663.7 9,487.3 14,009.5 14,389.9 1,784.1 154,514.4 99,515.1 23,050.6 53,316.1 83,956.3 56,659.3 35,628.2 86,264.5 13,411.4 lbs of chloroform removed 0.9 0.2 0.08 0.15 0.1 0.05 1.7 0.8 0.7 0.028 0.00 6.5 1.8 0.24 0.1 Gallons of chloroform removed 0.07 0.02 0.01 0.01 0.01 0.00 0.14 0.06 0.06 0.002 0.00 0.53 0.14 0.02 0.01
total lbs of chloroform removed 13.45
total gallons of chloroform removed 1.1
1) Assuming that the chloroform concentration result for the quarter monitoring event is the average chloroform concentration for the entire quarter.
Chloroform Pumping Wells
Nitrate Pumping Wells
AB = Abandonded Well
Table 2
Summary of QA/QC Samples
3rdQuarter 2020
Duplicate Samples of Wells
Parameter GWQS Duplicate of TW4-42 Duplicate of TW4-8 Duplicate of MW-32
TW4-42 TW4-65 RPD TW4-8 TW4-70 RPD MW-32 TW4-75 RPD
Chloride none 23.5 23.2 1.3 52.6 51.5 2.1 34.7 34.2 1.5
Nitrate + Nitrite (as N) 10 mg/L 3.65 3.15 14.7 0.894 0.938 -4.8 4.06 4.19 -3.2
Chloroform 70 pg/L <1.0 <1.0 nc 39.5 39.8 -0.8 <0.1 <0.1 nc
Carbon tetrachloride 5 pg/L <1.0 <1.0 nc <1.0 <1.0 nc <1.0 <1.0 nc
Chloromethane 30 pg/L <1.0 <1 0
<1.0
nc <1.0 <1.0 nc <1.0 <1.0 nc
Methylene Chloride 5 pq/L <1.0 nc <1.0 <1.0 nc <1.0 <1.0 nc
nc = not calculated
RPD (Relitive Percent Difference) > 20%