DRC-2023-002329 - 0901a068811b1178

Department of
Environmental Quality
Kimberly D. Shelley
Executive Director State of Utah
SPENCER J. COX
Governor
DIVISION OF WASTE MANAGEMENT
AND RADIATION CONTROL
DEIDRE HENDERSON
lieutenant Governor
Douglas J. Hansen
Director
MEMORANDUM
TO: Phil Goble -2/27)02--) PflG
FROM: Dean Henderson 3 /2--? l~z? ~
February 27, 2023 DATE:
SUBJECT: Review of the November 18, 2022 3rd Quarter, 2022 Chloroform Monitoring Report for
the Chloroform Contamination Investigation, Energy Fuels Resources (USA) Inc.
("EFRI") White Mesa Uranium Mill ("Mill"), near Blanding, Utah.
The Utah Division of Waste Management and Radiation Control ("Division") has reviewed the
November 18, 2022, 3rd Quarter, 2022 Chloroform Monitoring Report ("Report") for the Chloroform
Contamination Investigation. For the review of this report the following regulatory enforcement
documents were used:
• EFRI issued Ground Water Quality Discharge Permit No. UGW370004 ("Permit"). Permit
version that was signed on March 19, 2019.
• The EFRI Quality Assurance Plan ("QAP") September 10, 2019 (Revision. 7.6)
• The EFRI Groundwater Corrective Action Plan ("GCAP") September 14, 2015 (Revision 0)
• Utah Stipulation and Consent Order Docket Number UGW20-01, September 16, 2015.
REVIEW
GCAP Part III.C requires the 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 28, 2022 ( date of Report
November 18, 2022) which meets the GCAP requirement.
Monitor and Pumping Well Sampling
The following 43 monitor wells were sampled as required in the GCAP (see Table 1 below):
15 pumping wells: MW-4, MW-26, TW4-1 , TW4-2, TW4-4, TW4-11 , TW4-19, TW4-21 , TW4-22,
TW4-24, TW4-25, TW4-37, TW4-39, TW4-40, and TW4-41.
DRC-20 195 North 1950 West• Salt Lake City, UT
Mailing Address: P.O. Box 144880 • Salt Lake City, UT 84114-4880
Telephone (801 ) 536-0200 • Fax [phone] • T.D.D. [phone]
www.deq.utnh.gov
Printed on I 00% recycled paper
DRC-2023-002329
Page2
Current 6 performance monitoring ("PM") wells: TW4-7, TW4-10, TW4-16, TW4-26, TW4-29, and
TW4-30.
Current 20 compliance monitoring ("CM") wells MW-32, TW4-3,TW4-5, TW4-6, TW4-:8, TW4-9,
TW4-12, TW4-13, TW4-14, TW4-18, TW4-23, TW4-27, TW4-28, TW4-32, TW4-33, TW4-35, TW4-
36, TW4-38, TW4-42, and TW4-43.
The water samples for the above wells were analyzed for the following constituents as required in the
QAP:
Chloroform
Chloromethane
Carbon tetrachloride
Chloride
Methylene chloride
Nitrate + Nitrite as Nitrogen.
The analytical methods used is consistent with the requirements of the GCAP. For a summary of the 3rd
Quarter, 2022 and historic analytical results see Table I below.
Groundwater Head Monitoring
Depth to groundwater was measured in the following wells and/or piezometers, as required in Part I.E.3
of the Permit:
• The quarterly groundwater compliance monitoring wells.
• Existing monitoring well MW-4 and all of the temporary chloroform investigation wells.
• Piezometers P-1, P-2, P-3A, P-4 and P-5.
• MW-20 and MW-22.
• Nitrate monitoring wells.
• The DR piezometers which were installed during the Southwest Hydrologic Investigation.
In addition, weekly and monthly depth to groundwater measurements were taken in pumping wells
MW-4, MW-26, TW4-l, TW4-2, TW4-4, TW4-ll, TW4-19, TW4-21, TW4-22, TW4-24, TW4-25,
TW4-37, TW4-39, TW4-40, TW4-41, TW4-42, and TWN-2.
The monitoring wells were purged using the three approved QAP well purging strategies and meet QAP
requirements for each strategy:
1. Purging two casing volumes with stable field parameters for specific conductivity,
turbidity, pH, redox potential, and water temperature (within 10% RPD):
Wells: MW-32, TW4-5, TW4-8, TW4-9, TW4-16, TW4-18, TW4-23, TW4-32, and TW4-38.
2. Purging a well to dryness and stability of field parameters for pH, specific conductivity, and
water temperature only after recovery:
Wells: TW4-3, TW4-6, TW4-7, TW4-10, TW4-12, TW4-13, TW4-14, TW4-26, TW4-27,
TW4-28, TW4-29,TW4-30, TW4-31, TW4-33, TW4-34, TW4-35, TW4-36, TW4-42, TW4-43.
3. The pumping wells are continuously pumped on a set schedule and are sufficiently purged to
collect a sample
Page 3
Pumping Wells: MW-4, MW-26, TW4-1, TW4-2, TW4-4, TW4-11, TW4-19,
TW4-21, TW4-22, TW4-24, TW4-25, TW4-37, TW4-39, TW4-40, and TW4-41.
Holding Times
The water samples method holding times for each parameter for samples collected at each monitor well
were received and analyzed within the required holding times stated in the QAP.
Receipt Temperature
Water samples were received within the required QAP temperature limit of 6° C.
Analytical Methods
The analytical methods reported to be use by the laboratory to analyze Chloroform, Chloride,
Chloromethane, Methylene chloride, Carbon tetrachloride, and Nitrate + Nitrite as Nitrogen are
incompliance with analytical methods required in the Chloroform QAP.
Detection Limits
Analyses were measured and reported to the required reporting limits. However, several sets of sample
results had the reporting limit raised for at least one analyte due to matrix interference and/or sample
dilution. In all cases the reported value for the analyte was higher than the increased detection limit.
EFR Duplicate Sample Comparison
Three duplicate samples were collected. Monitor well TW4-32 and its duplicate sample TW4-65, and
TW4-9 and its duplicate sample TW4-70; and TW4-29 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 except for chloroform in TW4-9. Chloroform concentrations at TW4-9 is 10.8 µg/L
and its duplicate TW4-70 is 8.7 µg/L with a RPD of 21.5% (see Table 2 below). Both chloroform
concentrations are below the chloroform GWQS of 70 µg/L. Therefore, it is recommended that no
resampling be required.
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 2022 is 12.3 lbs. (see Table 3 below) which is less than the estimated 21.8 lbs.
removed in the 2nd Quarter 2022. The smaller mass removal is primarily due to reduce in
concentrations in TW4-37.
Using the "Chloroform Plume Mass Calculation Method" as described in Appendix A of the GCAP the
residual mass of chloroform within the plume is estimated as 850 lbs. in the 3rd Quarter, 2022. This
approximately 274 lbs. smaller than the 2nd Quarter 2022 estimated mass of 1,124 lbs.
Page4
As per Part III.B.2 of the GCAP, the electronic files were used in 3rd Quarter, 2022 to calculate the
mass estimates. The following files were used to calculate the. estimated chloroform mass within the
chloroform plume:
• Excel spreadsheet that included: well name; well location ( easting and northing); Laboratory
reported concentration in µg/1 in the 3rd Quarter, 2022 and corresponding log equivalent values.
• Surfer® griding parameters: kriging parameters: SURFER™default parameters.(point kriging,
linear variogram, slope= 1, no anisotropy [anisotropy= 1], no search constraints; minx, max x
(UTME[m]): 631900, 633043; min y, max y (UTME[m]): 4154240, 4155550.64; grid spacing in
x, y (m): 15.24, 15.24
• Surfer chloroform concentration grid file.
• Concentration GE 70 Grid file
• Intermediate Surfer Grid Files: water level grid; aquifer base grid; saturated thickness grid
Based on the review of these files it appears that the date entered and generated is appropriate to
calculate an estimated chloroform mass within the chloroform plume and EFRI followed Part III.B.2 and
Appendix A of the GCAP.
Reporting
The Report included the following information as required in the QAP:
a) Introduction
b) Sampling and Monitoring Plan
-Description of monitor wells
-Description of sampling methodology, equipment and decontamination procedures
-Identify all quality assurance samples, e.g. trip blanks, equipment blanks,
duplicate samples
c) Data Interpretation
-Interpretation of groundwater levels, gradients, and flow directions.
Interpretations will include a discussion on: 1) A current site groundwater
contour map, 2) hydrographs to show groundwater elevation in each
monitor well over time, 3) depth to groundwater measured and
groundwater elevation from each monitor well summarized in.a data table,
that includes historic groundwater level data for each well, and 4) an
evaluation of the effectiveness of hydraulic capture of all contaminants of
concern.
-Interpretation of all analytical results for each well, including a discussion
On: 1) a current chloroform isoconcentration map with one of the
Isoconcentration lines showing the 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.
Page 5
d) Conclusions and Recommendations
e) Electronic copy of all laboratory results for Chloroform Investigation monitoring conducted
during the quarter.
f) Copies of DUSA field records, laboratory reports and chain of custody forms.
Evaluation of the Chloroform Contaminate Plume and Its Associated Contaminants
Bounding Chloroform Plume
Groundwater monitoring data up to the 3rd Quarter, 2022 monitoring event appeared to show that the
chloroform contaminate plume ("Plume") and associated contaminants ( carbon tetrachloride,
chloromethane, and methylene chloride) is bound by up gradient, cross gradient, and down gradient
compliance monitoring wells that have a chloroform concentration of <70 µg/L ("GWQS = 70 µg/L).
Performance Monitor Wells ("PM") [Wells Exceeding Chloroform Concentrations GWOS of 70µg/L]
Five (5) PM wells still exceed 70 µg/L: TW4-7, TW4-10, TW4-16, TW4-26, and TW4-29.
Compliance Monitor Wells ("CM") [Wells with Chloroform Concentrations between< 1 and 70µg/L]
Ten (10) CM wells range with detectable chloroform concentration but still below 70µg/L: TW4-5,
TW4-6, TW4-8, TW4-9, TW4-14, TW4-18, TW4-27, TW4-30, TW4-33, and TW4-34.
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, TW4-35, TW4-36, TW4-38, TW4-
42, and TW4-43.
Pumping Wells
There are 15 pumping wells in full operation in the 2nd Quarter, 2022, 14 pumping wells MW-4, MW-
26, TW4-1, TW4-2, TW4-4, TW4-11, TW4-19, TW4-21 TW4-22, TW4-24, TW4-37, TW4-39, TW4-
40, and TW4-41 exceed chloroform concentrations of 70 µg/L. Pumping well TW4-25 had a non-
detectable (<1.0 µg/L) chloroform concentration (see table 1 below).
Nitrate, Nitrate + Nitrite ("nitrate") Concentrations
Pumping wells TW4-22 (45.0 mg/L) and TW4-24 (35.0 mg/L) exceed the nitrate GWQS of 10 mg/L.
These nitrate exceedances appear to be a result of the nitrate contaminant plume up-gradient of the
chloroform contaminant plume. This nitrate contaminant plume is being addressed under the Nitrate
Corrective Action Plan, approved on December 12, 2012.
Well, TW4-12 (16.0 mg/L 2nd quarter and 13.8 mg/L 3rd quarter 2022) and approximately 200 feet
down gradient, well TW4-28 (15.0 mg/L 2nd quarter and 16.2 mg/L 3rd quarter 2022) exceed the nitrate
GWQS of 10 mg/1. The source of nitrate may be from the chloroform source plume. Well, TW4-32
located approximately 200 feet down gradient ofTW4-28 has a nitrate concentration in the 3rd quarter
2022 below the nitrate GWQS of 1.81 mg/L. Therefore, at this time no action is recommended.
However, should future nitrate concentrations in down gradient well TW4-32 increases to above 10
mg/L or shows an increasing trend an additional investigation may be recommended.
Page 6
Well, TW4-27 (16.9 mg/L) continue to exceed the nitrate GWQS of 10 mg/1. The source of nitrate may
be from the chloroform source plume. Wells TW4-29, TW4-30, and TW4-31 located approximately
200 feet down and/or cross gradient ofTW4-27 have nitrate concentrations in the 3rd quarter 2022
below the nitrate GWQS of 2.8 mg/L, 2.61 mg/L, and 0.396 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 EFRI of the review and closing out of for the November 18, 2022, 3rd
Quarter, 2022 Chloroform Monitoring Report for the chloroform contamination investigation.
Page 7
References
EFRI, State of Utah Stipulated and Consent Order ("SCO") Docket Number UGW-20-01 White
Mesa Mill -Energy Fuels Resources (USA) Inc. ("EFRI") Plan and Time Schedule, Revision 1,
Pursuant to Part II.H.2 of the Groundwater Corrective Action Plan ("GCAP") included as
Attachment 1 to the SCO, January 10, 2018.
EFRI Quality Assurance Plan ("QAP") June 23, 2018 (Revision. 7.4)
EFRI issued Ground Water Quality Discharge Permit No. UGW370004. Permit version that was
signed on March 19, 2019.
EFRI, White Mesa Uranium Mill Chloroform Monitoring Report 3rd (July through September)
Quarter 2022, November 18. 2022 (DRC-2022-023255)
Page 8
Tables 1 through 3
MW-4cchlofoformpump!ngwell
Qrtedpumptngl/4103)
Sampling Event
TABLE 1 (1 of 33)
Historic Summary Of Monitoring Well Analytical Results Up To The 3rd Quarter 2022
Chloroform Contamination Investigation
DUSA White Mesa Mill
Parameter
IGWQS)
Carbon Tetrachloride Chloroform Chloromethane Methylene Chloride Chloride
15 ualll 170 un/LI 130 un/LI 15 ua/LI No GWQS Ima/LI
1st0tr 311612005 NA 2,900 NA NA
2ndQtr 512512005 NA 3,170 NA NA
3rdQtr 813112005 <10 3,500 <10 <10
4thQtr 12nt2005 <50 3 000 <50 <50
1stQtr 31912006 <50 3,100 <50 <50
2ndQtr 6/1412006 <50 3,000 <50 <50
3rd Qtr 7120/2006 <50 2,820 <50 <50
4th Qtr 111812006 2.1 2 830 1.4 <1.0
1stQtr 2128/2007 1.6 2,300 <1.0 <1.0
2ndQtr 612712007 1.8 2,000 <1 .0 <1.0
3rd Qtr 8115/2007 1.9 2,600 <1 .0 <1.0
4th Qtr 10/1012007 1.7 2 300 <1 .0 <1.0
1stQtr 3/2812008 1.7 2,400 ·<1.0 <1.0
2ndQtr 612512008 1.8 2,500 <1.0 <1.0
3rdQtr 911012008 1.8 1,800 <1.0 <1.0
4th Qtr 1011512008 1.7 2 100 <1.0 <1.0
1stQtr 31412009 1.5 2,200 <1.0 <1.0
2nd Qtr 6/2312009 1.3 1,800 <1.0 <1.0
3rdQtr 911412009 1.4 2,000 <1.0 <1.0
4th Qtr 12/1412009 1.6 1 800 <1.0 <1.0
1stQtr 211712010 1.2 1,600 <1.0 <1.0
2ndQtr 611412010 1.2 2,100 <1.0 <1.0
3rdQtr 81612010 1.5 1,900 <1.0 <1.0
4th Qtr 10115/2010 1.4 1 500 <1.0 <1.0
1stQtr 212312011 1.5 1,700 <1.0 <1.0
2ndQtr 611/2011 1.4 1,700 <1 .0 <1.0
3rd0tr 811712011 1.1 1,700 <1.0 <1.0
4th Qtr 1111612011 1.3 1600 <1.0 <1.0
fsfdfr ll) 112312012 1 1,500 <1 .0 <1.0
2nd Qtr -61612012 1.2 ~---1 .400 <1.0 ______ <1_0 -
3rdQtr 91412012 1.5 1,500 <1.0 <1.0
4thQtr 1014/2012 1 1 300 <1.0 <1.0
1stQtr 2111/2013 1.48 1,670 <1.0 <1.0
2nd0tr 61512013 1.31 1,490 <1 .0 <1.0
3rd0tr 91312013 1.13 1,520 <1.0 <1.0
4thQtr 10/2912013 5.58 1 410 <1.0 <1.0
1stQtr 112112ci'i4' 4.15 1,390 <1.0 <1.0
2nd0tr 511912014 5.21 1,390 <1 .0 <1.0
3rd0tr 8/1112014 7.6 1,490 <1.0 <1.0
4th Qtr 1012112014 <1.0 <1 .0 <1.0 ~---.1,i'!.9 1st Qtr (2) 31912015 1.26 1,400
<1.0 ______ <1.0 --------
2ndQtr 61812015 <1.0 1,300 <1 .0
3rd Qtr 8/3112015 <1.0 1,200
4thQtr 10119/2015 <1.0 1 200 <1 .0
1stQtr 31912ci'is <1.0 1,240 <1.0
2nd Qtr 5123/2016 1.44 1,580 <1.0
3rdQtr 712512016 <1.0 1,430 <1 .0
4th Qtr 10/1212016 1.24 1 470 <1 .0
1st0tr 31812017 1.2:i' 1,450 <1.0
2nd Qtr 611312017 1.15 1,430 <1.0
3rd Qtr 712612017 1.15 1,400 <1.0
4th0tr 10/1112017 <1.0 1,320 <1.0
OWMRC s lit samo1e <19 1 400 <30
1stQtr 3/1212018 1.07 1,320 <1.0
2nd Qtr 61812018 <1.0 1,240 <1 .0
3rd Qtr 8122/2018 <1.0 1,300 <1 .0
4th0tr 11128/2018 <1.0 1 330 <1.0
1stQtr 31812019 <1.0 1,190 <1 .0
2nd Qtr 61512019 <1.0 1,300 <1 .0
3rd0tr 91412019 <1.0 1,180 <1.0
4th 0tr 1211012019 <1.0 1 370 <1.0
1stQtr 211912020 <1.0 1,230 <1.0
2nd Qtr 512712020 <1.0 1,250 <1.0
3rd Qtr 91412020 <1.0 1,240 <1 .0
4thQtr 10118/2020 <1.0 1 050 <1 .0
1stQtr 212312021 <1.0 1,150 <1 .0
2nd Qtr 61912021 <1.0 1,320 <1.0
3rd Qtr 812412021 <1.0 1,140 <1 .0
4thQtr 12/112021 <1.0 1100 <1.0
1stQtr 319120:i':i' <1.0 1,040 <1.0
2nd Qtr 61812022 <1.0 1,010 <1.0
3rdQtr 8/3012022 <1.0 1 200 <1.0
MW-4AITW4-Al
1stQtr 311612005 NA 3,700 NA
2nd Qtr 512512005 NA 3,740 NA
3rd0tr 8/3112005 <10 3,800 <10
4thQtr 121712005 <50 3 000 <50
1st Ctr 31912006 <50 3,700 <50
2nd Qtr 611412006 <50 3,300 <50
3rd 0tr 712012006 <50 3,190 <50
4th Qtr 111812006 2.4 3 370 <1.0
1st Ctr 212512ciii'i' 1.9 2,500 <1.0
(1) As of March 2012 both north and south wild hfe ponds no longer receIvIng water
(2) chloroform pumping wells T\A/4-1 . T\A/4-2. and T\A/4-11 started rn 1/14115 -·
NA = not analyzed
Shaded indicates concentrations exceeding GWQS.
Bold and italics rnd1cates the MDL exceeded the GWQS.
J = Approximated value
<1.0
1.42 <1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
70 J
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
NA
NA
<10
<50
<50
<50
<50
<1.0
<1.0
Well abandonded
NA
NA NA
53
49
49
48
50
47
45
47
45
42
42
35
45
37
34
43
44
45
41
38
41
40
35
41
40
41.0
39.0
41.0
41.0
37.8
44.0
41.4
40.1
38.5
39.9
41.0
41.5
40.7
43.1
44.3
40.8
42.2
43.7
42.5
44.8
43.3
44.0
43.8
43.8
43.0
46.2
43.5
48.5
43.1
41.5
40.6
41.9
450.~
48.1
40.7
43.8
41.4
46.5
34.8
43.2
47.6
40.9
43.7
44.7
NA
NA
NA
55
53
54
54
54
60
Nitrate, Nitrate + Nitrite
l10ma/U
6.3
7.1
7.0
7.0
6.0
6.0
1.2
6.4
6.3
7.0
6.2
6.2 58
6.1
6.4
5.9
5.7
5.2
5.3
5.8
4.0
5.1
4.8
4.9
4.6
4.9
4.9
5.1
4.8 ___________ ,
4.9
5.0
4.8
4.78
4.22
4.89
5.25
4.7
4.08
3.7
----------5Jl7 5.75
2.53
4.79
4.43
5.15
4.54
4.95
4.88
4.99
4.88
4.59
5.25
5.1
4.47
4.64
4.55
4.44
5.05
5.16
4.69
4.34
6.22
5.04
4.93
4.62
4.61
6.48
3.83
4.90
4.80
3.90
4.20
7.1
7.8
6.9
6.7
5.8
7.3
1.2
7.1
7.1
TABLE 1 (2 of 33)
Historic Summary Of Monitoring Well Analytical Results Up To The 3rd Quarter 2022
Chloroform Contamination Investigation
DUSA White Mesa Mill
MW-26 (former TW4-15) Chlofofofm
pumping-ll1tartad 818/0J
Sampling Event
Carbon Tetrachloride Chloroform Chloromethane
15 ua/Ll 170 ua/Ll 130 ua/Ll
1stQtr 3/16/2005 NA 310 NA
2nd Qtr 5/25/2005 NA 442 NA
3rdQtr 8/31/2005 <5.0 960 5.4
4thQtr 12/7/2005 <50 1,000 <50
1stQtr 3/9/2006 <50 1,100 <50
2nd Qtr 6/14/2006 <50 830 <50
3rdQtr 7/20/2006 <50 2,170 <50
4thQtr 11/8/2006 <1.0 282 <1.0
1st Ctr 2/28/2007 <1.0 570 <1.0
2nd Qtr 6/27/2007 <1.0 300 <1.0
3rdQtr 8/15/2007 <1.0 1,400 <1.0
4thQtr 10/10/2007 <1.0 2 000 <1.0
1st Ctr 3/28/2008 <1.0 930 <1.0
2nd Qtr 6/25/2008 <1.0 1,300 <1.0
3rd Qtr 9/10/2008 <1.0 630 <1.0
4th Qtr 10/15/2008 NA NA NA
11/18/2008 <2.0 1 700 <2.0
1st Ctr 3/4/2009 <1.0 950 <1.0
2nd Qtr 6/23/2009 <1.0 410 <1.0
3rdQtr 9/14/2009 <1.0 850 <1.0
4thQtr 12/14/2009 <1.0 1100 <1.0
1stOtr 2/17/2010 <1.0 730 <1.0
2ndQtr 6/14/2010 1.2 1,600 <1.0
3rdQtr 8/16/2010 <1.0 2,200 <1.0
4thQtr 10/15/20,10 <1.0 970 <1.0
1stOtr 2/23/2011 <1.0 450 <1.0
2ndQtr 5/31/2011 <1.0 1,800 <1.0
3rdQtr 8/17/2011 <1.0 720 <1.0
4thQtr 11/16/2011 NA NA NA
__ (11 12/5/2011 <1.0 1 800 <1.0
1st Qtr (2) 2/27/2012 <1.0 ___ 1.~o_!! :1.0 ------2nd Qtr 6/6/2012 <1,0 3,000 <1.0
3rdQtr 9/4/2012 <1 3,100 <1
4thQtr 10/4/2012 <1 1 200 <1
1stQtr 2111,201:i' <1 2,120 <1
2ndQtr 6/5/2013 <1.0 4,030 <1.0
3rdQtr 9/3/2013 <1.0 2,940 <1.0
4thQtr 10/29/2013 <1.0 1 410 <1
1st0tr 1/27/2014 <1.0 1,400 <1.0
2ndQtr 5/19/2014 <1.0 1,960 <1.0
3rdQtr 8/11/2014 <1.0 2,120 8.7
4thQtr 10/21/2014 <1.0 2 090 <1.0
1stQtr 3/9/2015 <1.0 1,980 <1.0
2nd Qtr (3) 6/8/2015 <1.0 1,980 <1.0
3rd Qtr 8/31/2015 <1.0 ---2,350 ------:ia5
4thQtr 10/19/2Q.1.?.. <1.0 2 680 1.32
1stQtr 3/9/2016 <1.0 2,650 <1.0
2ndQtr 5/23/2016 <1.0 2,220 <1.0
3rdQtr 7/25/2016 <1.0 3,190 <1.0
4th Qtr (4) 10/12/2016 <1.0 2,510 <1.0
1st Qtr -----3/8/2017 <1.0 ---------1 ,290 <1.0 ------
2ndQtr 6/13/2017 <1.0 2,450 <1.0
3rdQtr 7/26/2017 <1.0 1,230 <1.0
4thQtr 10/11/2017 <1.0 2 570 <1.0
1stQtr 3/12/2018 <1.0 1,210 <1.0
2ndOtr 6/8/2018 <1.0 1,870 <1.0
3rdQtr 8/22/2018 <1.0 1,680 <1.0
4thQtr 11/28/2018 <1.0 1 480 <1.0
1stOtr 3/8/2019 <1.0 1,110 <1.0
2nd Qtr 6/5/2019 <1.0 1,280 <1.0
3rdQtr 9/4/2019 <1.0 1,680 <1.0
4thQtr 12/10/2019 <1.0 1 390 <1.0
1stQtr 2/19/2020 <1.0 1,100 <1.0
2nd Qtr 6/12/2020 <1.0 1,140 <1.0
3rdQtr 9/4/2020 <1.0 1,130 <1.0
4thQtr 10/28/2020 <1.0 866 <1.0
1stQtr 2/23/2021 <1.0 3,060 <1.0
2nd Otr 6/6/2021 <1.0 998 <1.0
3rdQtr 8/24/2021 <1.0 1,580 <1.0
4thQtr 12/1/2021 <1.0 826
1stQtr 3/9/2022 <1.0 1,030 <1.0
2nd Qtr 6/8/2022 <1.0 611 <1.0
3rdQtr 8/30/2022 <1.0 612 <1.0
(1) voes were resampled because laboratory m,ssed holding time.
(2) As of March 2012 both north and south wild hfe ponds no longer receIvmj! water
(3) chloroform pumpI'!2 well TW4.n' started m 6/9/15 J'!l ch1oroform,.eum.e!'!i welts"'Tw4•1. lW4-2. and TW4•11 started m 1/14/15 -·
NA =-not analyzed
Shaded indicates concentrations exceedIni:i GWQS.
Bold and italics indicates the MOL exceeded the GWQS.
5.9
Parameter
IGWQSl
Methylene Chloride
15 ua/Ll
NA
NA
<5.0
<50
<50
<50
<50
2.6 5.5
13
36
14
40
53
24
NA
100
51
12
30
40
19
<1.0
21
6.5 :is
1.3
7.2
NA
2.9
16
-21
31
4
9.34
52.4
33.2
4.03
13.8
15.4
26
23.2
27.4
11.2
11.6
8.28
4.66
4.57
7.81
4.31
7.65
7.59
5.26
7.83
2.14
9.19
<1.0
<1.0
2.2
1.19
1.93
1.78
<1.0
<1.0
2.57
<1.0
3.46
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
Chloride
No GWQS lma/Ll
NA
NA
NA
55
52
52
65
54
56
49
57
57
49
57
44
64
NA
49
48
46
60
57
40
49
65
57
88
58
69
NA
98 ---------73
73
68
81 .9
77.9
60.5
72.3
59.4
53.4
59
60.1
56.5
62
69.6
62.6
68.3
66.2
66.4
66.2
58.4
64.3
61.4
62.2
60.3
58.7
91.4
85.5
69.9
80.7
76.2
83.2
88.9
35.1
70
37.4
59.5
48.6
46.6
84.7
50.2
63.4
57.0
Nitrate, Nitrate + Nitrite
110 mo/Ll
0.3
0.2
0.2
0.3
0.2
0.2
1.4
0.3
0.6
0.4
1
0.6
0.1
0.6
0.2
0.1
NA
0.4
0.2
0.1
2.3
0.2
6.8
0.6
0.7
0.5
0.4
0.9
2.0
NA
----------);7 2.5
2.6
1.8
2.27
2.11
1.18
1.38
0.55
0.93
0.7
0.93
0.73
----------OA2 0.68
0.991
1.45
1.12
1.57
1.18 -----------· 0.768
0.922
1.56
1.18
1.57
0.901
2.80
1.96
1.85
2.83
3.08
0.977
1.17
2.93
0.42
3.62
0.349
0.81
0.671
0.52
0.3
0.22
0.662
MW-32 (former TW4-17}
Sampling Event
TABLE 1 (3 of 33)
Historic Summary Of Monitoring Well Analytical Results Up To The 3rd Quarter 2022
Chloroform Contamination Investigation
DUSA White Mesa Mill
Parameter
IGWQS)
Carbon Tetrachloride Chloroform Chloromethane Methylene Chloride Chloride Nitrate, Nitrate + Nitrite
15 ua/Ll 170 ua/Ll 130 ua/Ll
1st Ctr 3/16/2005 NA <1.0 NA NA
2nd Qtr 5/25/2005 NA <1.0 NA NA
3rd Qtr 8/31/2005 <1.0 <1.0 3.2 <1.0
4th0tr 12/7/2005 <1.0 <1.0 <1.0 <1.0
1stQtr iiiit2006 <1.0 <1.0 <1.0 <1.0
2nd Qtr 6/14/2006 <1.0 <1.0 3.5 <1.0
3rd Qtr 7/20/2006 <1.0 <1.0 1.8 <1.0
4th0tr 11/8/2006 <1.0 <1.0 1.5 <1.0
1s10tr 2/28/2007 <1.0 <1.0 <1.0 <1.0
2nd Qtr 6/27/2007 <1.0 <1.0 <1.0 <1.0
3rdQtr 8/15/2007 <1.0 <1.0 <1.0 <1.0
4thQtr 10/10/2007 <1.0 <1.0 <1.0 <1.0
1st Ctr 3/28/2008 <1.0 <1.0 <1.0 <1.0
2ndQtr 6/25/2008 <1.0 <1.0 <1.0 <1.0
3rdQtr 9/10/2008 <1.0 <1.0 <1.0 <1.0
4th0tr 10/15/2008 <1.0 <1.0 <1.0 <1.0
1s!Otr 3/4/2009 <1.0 <1.0 <1.0 <1.0
2nd0tr 6/23/2009 <1.0 <1.0 <1.0 <1.0
3rdQtr 9/14/2009 <1.0 <1 .0 <1.0 <1.0
4thQtr 12/16/2009 <1.0 <1 .0 <1.0 <1.0
1stQtr 2/17/2010 <1.0 <1.0 <1.0 <1.0
2ndQtr 6/14/2010 <1.0 <1.0 <1.0 <1.0
3rdQtr 8/16/2010 <1.0 <1.0 <1.0 <1.0
4thQtr 10/15/2010 <1.0 <1.0 <1.0 <1.0
1stQtr 2/23/2011 <1.0 <1.0 <1.0 <1.0
2nd0tr 5/25/2011 <1.0 <1.0 <1.0 <1.0
3rdQtr 8/18/2011 <1.0 <1.0 <1.0 <1.0
4th0tr 11/16/2011 NA NA NA NA
............... J1l 12/7/2011 <1.0 <1.0 <1.0 <1.0
1st Qtr (2) 1/18/2012 <1.0 <1.0 ~1.0 ------<1.0
<1.0-2nd Otr 6/22/2012 <1.0 <1.0 <1.0
3rdQtr 9/5/2012 <1.0 <1.0 <1.0
4th0tr 10/10/2012 <1.0 <1 .0 <1.0
1stQtr 2/11/2013 <1.0 <1.0 <1.0
2nd Otr 6/18/201 3 <1.0 <1 .0 <1.0
3rd Qtr 9/3/201 3 <1.0 <1 .0 <1.0
4th0tr 10/29/2013 <1.0 <1.0 <1.0
1s10tr 1/29/2014 <1.0 <1.0 <1.0
2ndQtr 5/23/2014 <1.0 <1.0 <1.0
3rd Qtr 8/26/2014 <1.0 <1.0 <1.0
4th0tr 10/29/2014 <1.0 <1.0 <1.0
1stQtr 3/17/2015 <1.0 <1.0 <1.0
2nd Qtr 6/11/2015 <1.0 <1.0 <1.0
3rdQtr 9/9/2015 <1.0 <1.0 <1.0
4thQtr 10/28/2015 <1.0 <1.0 <1.0
1s1Qtr 3/22/2016 <1.0 <1.0 •·i 0
Duplicate TW4-70 <1.0 <1.0 <1.0
2nd Qtr 6/8/2016 <1.0 <1.0 <1.0
Duplicate TW4-70 <1.0 <1 .0 <1.0
3rd Qtr 8/19/2016 <1.0 <1.0 <1.0
4th0tr 10/31/2016 <1.0 <1.0 <1.0
1s1Qtr 3/21/2017 <1.0 <1 .0 <1.0
2nd0tr 6/21/2017 <1.0 <1 .0 <1.0
3rd0tr 8/8/2017 <1.0 <1.0 <1.0
4th0tr 10/12/201 7 <1.0 <1.0 <1.0
1stQtr 3/15/2018 <1 .0 <1.0 <1.0
Duplicate TW4-70 <1.0 <1.0 <1.0
2nd Qtr 6/14/2018 <1.0 <1.0 <1.0
3rdQtr 9/22/2018 <1.0 <1.0 <1.0
4th0tr 10/29/2018 <1.0 <1.0 <1.0
1stQtr 3/19/2019 <1.0 <1.0 <1.0
2nd Qtr 6/18/2019 <1.0 <1.0 <1.0
3rd0tr 9/11/2019 <1.0 <1.0 <1.0
4th0tr 12/18/2019 <1.0 <1.0 <1.0
1s1Qtr 3/18/2020 <1.0 <1.0 <1.0
Duplicate TW4-75 <1.0 <1.0 <1.0
2nd Otr 6/12/2020 <1.0 <1.0 <1.0
3rdQtr 9/18/2020 <1.0 <1.0 <1.0
4thQtr 11/4/2020 <1 .0 <1.0 <1.0
Du licate TW4-65 <1.0 <1.0 <1.0
·1·statr 3/18/2021 <1.0 <1.0 <1.0
Duplicate TW4-75 <1.0 <1.0 <1.0
2nd0tr 6/17/2021 <1.0 <1.0 <1.0
Duplicate TW4-75 <1.0 <1.0 <1.0
3rd0tr 9/23/2021 <1.0 <1.0 <1.0
Duplicate TW4-75 <1.0 <1.0 <1.0
4th0tr 12/9/2021 <1.0 <1.0 <1.0
1s!Otr 3/22/2022 <1.0 <1.0 <1.0
2ndQtr 6/16/2022 <1.0 <1.0 <1.0
3rdQtr 9/15/2022 <1.0 <1.0 <1.0
(1) voes were resampled because laboratory missed holding time.
(2) As of March 2012 both north and south wild life ponds no longer receIvIng water
NA =-not analyzed
Shaded indicates concentrations exceeding GWQS
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1 .0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
15 ua/Ll No GWQS (ma/Ll 110 ma/Ll
NA <0.1
NA <0.1
NA <0.1
33 <0.1
32 <0.1
30 <0.1
32 <1.0
31 <.1
32 <1.0
32 <1.0
31 <1.0
32 <1.0
31 <.1
29 <1.0
30 <1.0
26 <0.05
30 <.1
31 <0.1
33 <0.1
35 <0.1
38 <0.1
32 <0.1
28 <0.1
24 <0.1
40 <0.1
31 <0.1
33 <0.1
32 <0.1
NA NA
21 <0.1 ---------32 <0.1
33 <0.1
35 <0.1
34.3 <0.1
34.9 <0.1
33 <0.1
35.7 <0.1
34 <0.1
39.7 <0.1
34 <0.1
34.9 <0.1
36.3 <0.1
35.8 <0.1
37.7 <0.1
34.7 <0.1
36.7 <0.1
37.7 0.119
36.4 <0.1
37.7 <0.1
35.7 <0.1
36.9 <0.1
33.7 <0.1
37.2 <0.1
38.1 <0.1
32.6 <0.1
39.4 <0.1
39.3 <0.1
34.4 <0.1
41.2 <0.1
32.9 <0.1
35.3 <0.1
36.5 <0.1
41 .2 <0.1
36.3 <0.1
36 <0.1
34.8 <Q.1
35.6 <0.1
34.7 <0.1
31.3 <0.1
35.9 <0.1
36.8 <0.1
37.4 <0.1
35.8 <0.1
34.3 <0.1
35.3 <0.1
35.5 <0.1
35.8 <0.1
28.6 <0.1
26.9 <0.1
37.2 <0.1
TABLE 1 (4 of 33)
Historic Summary Of Monitoring Well Analytical Results Up To The 3rd Quarter 2022
Chloroform Contamination Investigation
OUSA White Mesa Mill
TW4-1 (ehlorotorm pumping•
iltalted1111/1...-15)
Sampling Event
Carbon Tetrachloride Chloroform Chloromethane
15 ua/Ll /70 ua/Ll /30 ua/Ll
1stQtr 3/16/2005 NA 2,700 NA
2nd Qtr 5/25/2005 NA 3,080 NA
3rdQtr 8/31/2005 <10 2,900 <10
4thQtr 12/7/2005 <50 2 400 <50
1sIQtr 3/9/2006 <50 2,700 <50
2nd Qtr 6/14/2006 <50 2,200 <50
3rd Qtr 7/20/2006 <50 2,840 <50
4thQtr 11/8/2006 1.4 2 260 <1.0
1sIQtr 2/28/2007 1.2 1,900 <1.0
2nd Qtr 6/27/2007 1.4 1,900 <1.0
3rd Qtr 8/15/2007 1.3 2,300 <1.0
4thQtr 10/10/2007 1.3 2 000 <1.0
1stQtr 3/28/2008 1.3 2,000 <1.0
2nd Qtr 6/25/2008 1.1 1,900 <1.0
3rd Qtr 9/10/2008 1.3 1,700 <1.0
4thQtr 10/15/2008 1.3 1 700 <1.0
1stQtr 3/11/2009 1.1 1,700 <1.0
2ndQtr 6/23/2009 1 1,500 <1.0
3rdQtr 9/14/2009 <1.0 1,700 <1.0
4thQtr 12/29/2009 <1.0 1400 <1.0
1stQtr 3/3/2010 <1.0 1,300 <1.0
2ndQtr 6/14/2010 1.2 1,600 <1.0
3rdQtr 8/18/2010 1 1,600 <1.0
4thQtr 10/15/2010 <1.0 1 500 <1.0
1stQtr 2/24/2011 <1.0 1,300 <1.0
2nd Qtr 6/1/2011 <1.0 1,200 <1.0
3rdQtr 8/18/2011 <1.0 1,300 <1.0
4th Qtr 11/29/2011 <1.0 1 500 <1.0
1st Qtr (2) 1/24/2012 <1.0 1,300 <1.0
2nd Qtr -6/14/2012 <1.0 -~------<1.0 ______
1,000
3rdQtr 9/28/2012 <1.0 1,000 <1.0
4thQtr 10/4/2012 <1.0 1100 <1.0
1stQtr 2/13/2013 3.66 1,320 <1.0
2nd Qtr 6/19/2013 <1.0 1,100 <1.0
3rd Qtr 9/3/2013 <1.0 1,150 <1.0
4thQtr 11/14/2013 <1.0 1 280 <1.0
1stQtr 2/5/20.i4. 5.47 1,090 <1.0
2nd Qtr 5/23/2014 4.77 1,020 <1.0
3rdQtr 8/27/2014 <1.0 845 1.4
4thQtr ____ 10/29/2014 <1.0 ___ .!,.!'!2 <1;2._ ______ -----------1sIQtr(2l 3/9/2015 <1.0 1,130 <1.0
2nd Qtr 6/8/2015 <1.0 1,260 <1.0
3rd Qtr 8/31/2015 <1.0 1,060 <1.0
4th Qtr 10/19/2015 <1.0 1 040 <1.0
1sIQtr 3/9/2016 <1.0 974 <1.0
2nd Qtr 5/23/2016 <1.0 1,140 <1.0
3rd Qtr 7/25/2016 <1.0 1,160 <1.0
4thQtr 10/13/2016 <1.0 1 330 <1.0
1stQtr 3/8/2017 <1.0 519 <1.0
2nd Qtr 6/13/2017 <1.0 977 <1.0
3rdQtr 7/26/2017 <1.0 958 <1.0
4thQtr 10/11/2017 <1.0. 556 <1.0 r~m· -'!,,,,,,,. <7.6 810 <12
<1.0 70.4 <1.0
2nd Qtr -6/8/2018 <1.0 -------1-------<1.0 ------942
3rd Qtr 8/22/2018 <1.0 1,010 <1.0
4th Qtr 10/22/2018 <1.0 752 <1.0
pWMRC SPIit sample <5.0 210 <5.0
1stQtr 3/8/2019 <1.0 872 <1.0
2nd Qtr 6/5/2019 <1.0 1,040 <1.0
3rdQtr 9/4/2019 <1.0 894 <1.0
4thQtr 12/10/2019 <1.0 1 070 <1.0
1stQtr 2/19/2020 <1.0 1,190 <1.0
2nd Qtr 5/27/2020 <1.0 499 <1.0
3rd Qtr 9/4/2020 <1.0 1,060 <1.0
4th .. Otr 10/28/2020 <1.0 924 <1.0
1stQtr 2/23/2021 <1.0 948 <1.0
2ndQtr 6/9/2021 <1.0 957 <1.0
3rdQtr 8/24/2021 <1.0 821 1.18
4thQtr 12/1/2021 <1.0 957 <1.0
1stQtr 3/9/2022 <1.0 946 <1.0
2ndQtr 6/8/2022 <1.0 914 <1.0
3rdQtr 8/30/2022 <1.0 954 <1.0
(1) As of March 2012 both north and south wild hfe p(mds no longer rece1vm.2_ water
j2) TW4-1 converted to a chloroform pump1n.2,_ well started 1n 1/14/15
j~ chloroform J!Uffif.!~ well TW4-41 started tn M'!i'. 2018 __ ,
NA= not analyzed
Shaded indicates concentrations exceeding GWQS
Bold and italics indicates the MDL exceeded the GWQS.
J = Approximated value
Parameter
/GWQS)
Methylene Chloride
15 uo/Ll
NA
NA
<10
<50
<50
<50
<50
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1_0 -
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0 ----------<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
23 J
<1.0 <1.0 ____
<1.0
<1.0
<5.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
Chloride
No GWQS tma/Ll
NA
NA NA
52
49
48
51
47
47
45
43
43
39
39
35
41
37
37
36
41
35
40
35
40
41
35
36
40
38 ---------42
39
40
37.6
39.1
37.6
36.5
38.9
37.4
38
--------38.7 38.3
40.3
45.9
38.5
41.7
44.4
44.7
44.2
41.5
41.8
42.8
38.5
42
45.8
42.0
47.3
43.2
NA
40.9
44.8
46
44.2
47.5
46.4
43.7
41.9
45.4
37.2
44.8
45.5
42.6
45.5
45.1
Nitrate, Nitrate + Nitrite
110 ma/L\
9.1
10.6
9.8
9.7
9.4
9.6
9.2
8.9
9
8.4
7.8
7.6
8.68
8.15
9.3
7.5
6.9
7.3
6.8
7.1
6.8
6.7
6.6
6.6
6.6
6.8
6.6
6.8 -----------■ 7.1
5.0
6.5
6.99
6.87
7.12
7.08
7.74
6.93
4.80
----------6.31 7.06
6.07
6.28
1.55
0.148
0.138
5.49
0.746
4.44
5.74
5.04
5.78
0.17
4.84 ___________ .,
4.38
4.30
4.57
0.46
4.51
1.43
1.65
3.91
4.67
0.44
2.22
4.30
2.72
0.73
1.38
4.37
3.90
0.18
0.42
TABLE 1 (5 of 33)
Historic Summary Of Monitoring Well Analytical Results Up To The 3rd Quarter 2022
Chloroform Contamination Investigation
DUSA White Mesa Mill
TW4-2 (cl'lloroloon pumping well
Slaltingl/14115) Parameter
Sampling Event (GWQSI
Carbon Tetrachloride Chloroform Chloromethane Methylene Chloride
(5 uQ/LI 170 ua/Ll 130 uQ/Ll 15 un/L\
1stOtr 3/16/2005 NA 3,700 NA NA
2nd Qtr 5/25/2005 NA 3,750 NA NA
3rdQtr 8/31/2005 <10 3,900 <10 <10
4th0tr 12/7/2005 <50 3,500 <50 <50
1stQtr 3/9/2006 <50 3,800 <50 <50
2nd Qtr 6/14/2006 <50 3,200 <50 <50
3rd Qtr 7/20/2006 <50 4,120 <50 <50
4th Qtr 11/8/2006 2.3 3 420 <1.0 <1 .0
1stQtr 2/28/2007 18 2,300 <1.0 <1 .0
2nd Qtr 6/27/2007 2.5 3,000 <1.0 <1.0
3rd Qtr 8/15/2007 2.2 340 <1.0 <1.0
4th0tr 10/10/2007 2.1 3 200 <1.0 <1.0
1st0tr 3/28/2008 2.3 3,300 <1.0 <1.0
2ndQtr 6/25/2008 2.2 3,100 <1.0 <1 .0
3rdQtr 9/10/2008 2.4 2,800 <1.0 <1.0
4thQtr 10/15/2008 NA #NIA NA NA
11/18/2008 2.4 3 200 <2.0 <2.0
1st0tr 3/11/2009 2.2 3,100 -<1.0 <1.0
2nd Qtr 6/23/2009 2 2,800 <1.0 <1.0
3rdQtr 9/14/2009 2 3,000 <1.0 <1.0
4thQtr 12/29/2009 2 1600 <1.0 <1.0
1st0tr 3/3/2010 2 2,600 <1.0 <1.0
2ndQtr 6/14/2010 2.6 3,300 <1.0 <1 .0
3rdQtr 8/18/2010 2.5 3,300 <1.0 <1.0
4th0tr 10/15/2010 2.1 3 000 <1.0 <1.0
1st0tr 2/24/2011 2.4 3,100 <1.0 <1 .0
2nd Qtr 6/2/2011 2.2 3,000 <1.0 <1 .0
3rd0tr 8/17/2011 1.6 2,400 <1.0 <1.0
4th0tr 11/29/2011 2.8 3 900 <1.0 <1.0
1st0tr(2) 1/24/2012 2 2,500 <1.0 <1.0
2nd Qtr 6/14/2012 2.1 ---2 ,500 <1.0 ______ <1 .0
3rdQtr 9/4/2012 1.8 2,900 <1.0 <1.0
4th0tr 10/4/2012 2 3 100 <1.0 <1.0
1st0tr 2/13/2013 5.17 3,580 <1.0 <1.0
2nd Qtr 6/19/2013 2.65 3,110 2 <1.0
3rdQtr 9/3/2013 2.41 3,480 <1.0 <1.0
4th0tr 11/14/2013 3.15 3 740 <1.0 <1.0
1stQtr 2/6/2014 7.1 3,180 <1.0 <1.0
2ndQtr 5/23/2014 6.05 2,930 <1.0 <1.0
3rdQtr 8/27/2014 1.4 3,170 3.6 <1.0
4th Qtr 10/30/2014 2.6 3,580 <1.0
1st Qtr (2) 3/9/2015 1.44 ---1 ,840 <1.0 ______
2ndQtr 6/8/2015 <1.0 1,650 <1.0
3rd Qtr 8/31/2015 <1.0 1,060
4th0tr 10/19/2015 2.6 2 070 ~..1.0
1stQtr 3/9/2016 1.2 1,970 <1.0
2ndQtr 5/23/2016 1.49 2,070 <1.0
3rdQtr 7/25/2016 <1.0 1,780 <1.0
4thQtr 10/12/2016 <1.0 1 600 <1.0
1stQtr 3/8/2017 <1.0 1,570 <1.0
2ndQtr 6/13/2017 <1.0 1,940 <1.0
3rdQtr 7/26/2017 <1.0 1,310 <1.0
4th0tr 10/11/2017 <1.0 1,610 <1.0
DWMRC spilt sample <19 1,200 <30
DWMRC ducl1cate TW4•50 <19 1 200 <30
1stQtr 3/12/2018 <1.0 764 <1.0
2ndQtr 6/8/2018 <1.0 949 <1.0
3rd0tr 8/22/2018 <1.0 980 <1.0
4th0tr 10/22/2018 <1.0 822 <1.0
1stQtr 3/8/2019 <1.0 1,0,fo <1.0
2nd0tr 6/5/2019 <1.0 1,360 <1.0
3rdQtr 9/412019 <1.0 797 <1.0
4th0tr 12/10/2019 <1 .0 934 <1.0
1stQtr 2/19/2020 <1.0 1,880 <1.0
2nd0tr 6/10/2020 <1.0 1,070 <1.0
3rdQtr 9/4/2020 <1.0 1,260 <1.0
4th0tr 10/28/2020 <1.0 1 130 <1.0
1st0tr 2/23/2021 <1.0 939 <1.0
2nd0tr 6/9/2021 <1.0 1,160 <1.0
3rd0tr 8/24/2021 <1.0 1,150 <1.0
4th0tr ·12/1/2021 <1.0 852 <1.0
1st0tr 3/17/2022 <1.0 1,020 <1.0
2ndQtr 6/8/2022 <1.0 892 <1.0
3rd0tr 8/30/2022 <1.0 832 <1.0
(1) As of March 2012 both north and south wild life onds no longer rec..2~n.,2_ ~a.ter --------------------~~------(2) 1W4•2 and 1W4•11 converted to a chloroform _eume n.2. well started m 1/14/15
NA and #NJA(for graph use)= not analyzed
Shaded mdicates concentrations exceeding GWQS.
Bold and italics indicates the MOL exceeded the GWOS
J = Approximated value
2.6
<1.0
<1_0 --
<1.0
<1.0
<1 .0
<1 .0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1 .0
<1 .0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
68 J
60 J
Chloride
No GWQS tmn/Ll
NA
NA
NA
56
56
56
54
55
54
50
49
51
48
46
42
47
NA
46
44
43
46
42
43
43
41
46
42
48
49
49
---------52
76
49
46
46.9
44.9
43.9
45.9
45.4
45
45.5
44.9
48.1
50
41 .9
43.4
43.8
42.9
44.3
43.1
43.6
43.2
43.5
44
43
44.4
41 .3
44.3
41 .7
40.4
39.8
40.8
41 .5
42.1
40.6
41 .3
38.7
43.3
32.5
36.8
41 .9
36.7 . 39.5
40.7
Nitrate, Nitrate + Nitrite
f10mn/Ll
7.7
8.6
8.0
7.8
7.5
7.1
7.4
7.6
7.3
7.8
7.3
6.9
6.9
7.4
7.1
8.0
#NIA
6.5
6.4
6.6
6.4
6.8
8.7
6.6
6.5
7.0
6.8
6.0
7.0
7.1
7.7
4.0
7.6
8.1
7.51
9.3
8.39
7.87
9.11
6.2
8.45
5.32
4.3
3.76
5.18
5.30
5.67
4.07
6.07
4.74
4.90
5.08
3.25
4.00
5.00
2.94
3.50
4.83
3.52
3.92
4.38
4.79
3.40
6.07
3.62
3.35
'2.34
3.30
3.89
1.97
3.49
3.3
3.1
3.07
TABLE 1 (6 of 33)
Historic Summary Of Monitoring Well Analytical Results Up To The 3rd Quarter 2022
Chloroform Contamination Investigation
DUSA White Mesa Mill
TW4-3 Parameter
Sampling Event IGWQS)
carbon Tetrachloride Chloroform Chloromethane Methylene Chloride Chloride
15 uo/Ll (70 unn I (30 uo/Ll 15uo/Ll No GWQS (m"" '
1stQtr 3/16/2005 NA <1.0 NA NA NA
2ndQtr 5/25/2005 NA <1.0 NA NA NA
3rd Qtr 8/31/2005 <1.0 <1.0 6.4 <1.0 NA
4thQtr 12m2005 <1.0 <1.0 <1.0 <1.0 26
1stQtr 3/9/2006 <1.0 <1.0 2.3 <1.0 :is·
2ndQtr 6/14/2006 <1.0 <1.0 1.6 <1.0 26
3rd Qtr 7/20/2006 <1.0 <1.0 2.2 <1.0 26
4thQtr 11/8/2006 <1.0 <1.0 <1.0 <1.0 23
1stQtr 2/2812007 . <1.0 <1.0 <1.0 <1.0 22
2ndQtr 6/27/2007 <1.0 <1.0 <1.0 <1.0 23
3rd Qtr 8/15/2007 <1.0 <1.0 <1.0 <1.0 24
4th_Qtr 10/10/2007 <1.0 <1.0 <1.0 <1.0 27
1stQtr 3/28/2008 <1.0 <1.0 <1.0 <1.0 :ii"
2ndQtr 6/25/2008 <1.0 <1.0 <1.0 <1.0 19
3rd Qtr 9/10/2008 <1.0 <1.0 <1.0 <1.0 19
4thQtr 10/15/2008 <1.0 <1.0 <1.0 <1.0 22
1stQtr 3/4/2009 <1.0 <1.0 <1.0 <1.0 2i'
2ndQtr 6/23/2009 <1.0 <1.0 <1.0 <1.0 20
3rd Qtr 9/14/2009 <1.0 <1.0 <1.0 <1.0 21
4thQtr 12/29/2009 <1.0 <1.0 <1.0 <1.0 22
1statr 2/23/2010 <1.0 <1.0 <1.0 <1.0 23
2ndQtr 6/14/2010 <1.0 <1.0 <1.0 <1.0 24
3rdQtr 8/10/2010 <1.0 <1.0 <1.0 <1.0 22
4thQtr 10/15/2010 <1.0 <1.0 <1.0 <1.0 26
1stQtr 2/15/2011 <1.0 <1.0 <1.0 <1.0 23
2ndQtr 5/25/2011 <1.0 <1.0 <1.0 <1.0 23
3rd Qtr 8/17/2011 <1.0 <1.0 <1.0 <1.0 23
4thQtr 11/14/2011 <1.0 <1.0 <1.0 <1.0 23
lstatr(2) 1/17/2012 <1.0 ~~Q_ ____ <.J.;Q_ ______ <1.0 :ff
2nd Qtr 5/31/2012 <1.0 <1.0 <1.0 <1.0---------------24
3rd Qtr 8/28/2012 <1.0 <1.0 <1.0 <1.0 25
4thQtr 10/3/2012 <1.0 <1.0 <1.0 <1.0 25
1stQtr 2/7/2013 :;·,-.o <1.0 <1.0 <1.0 23.7
2ndQtr 6/28/2013 <1.0 <1.0 <1.0 <1.0 23.8
3rd Qtr 9/3/2013 <1.0 <1.0 <1.0 <1.0 25
4thQtr 11/8/2013 <1.0 <1.0 <1.0 <1.0 24.1
1stQtr 1/22/2014 <1.0 <1.0 <1.0 <1.0 24.9
2ndQtr 5/21/2014 <1.0 <1.0 <1.0 <1.0 24.4
3rd Qtr 8/13/2014 <1.0 <1.0 <1.0 <1.0 26
4thQtr 10/23/2014 <1.0 <1.0 <1.0 <1.0 26.7
1stQtr 3/11/2015 •·i.o <1.0 <1.0 <1.0 26.2
2ndQtr 6/10/2015 <1.0 <1.0 <1.0 <1.0 27.5
Duplicate TW4-65 <1.0 <1.0 <1.0 <1.0 27.5
3rd Qtr 8/13/2015 <1.0 <1.0 <1.0 <1.0 27.4
4thQtr 10/21/2015 <1.0 <1.0 • ~1.0 <1.0 25.6
1stQtr 3/15/2016 <1.0 <1.0 <1.0 <1.0 32.8
2ndQtr 5/25/2016 <1.0 <1.0 <1.0 <1.0 27.9
3rd Qtr 7/27/2016 <1.0 <1.0 <1.0 <1.0 26.5
4thQtr ............... 10/19/2016 <1.0 <1.0 <1.0 <1.0 29.5
1stQtr 3/14/2017 <1.0 <1.0 <1.0 :;·,o 28.1
2ndQtr 6/14/2017 <1.0 <1.0 <1.0 <1.0 28.7
3rd Qtr 7/27/2017 <1.0 <1.0 <1.0 <1.0 28.5
Duphcate TW4-65 <1.0 <1.0 <1.0 <1.0 28.9
114th Qtr 10/11/2017 <1.0 <1.0 <1.0 <1.0 25.9
U1stQtr 3/14/2018 <1.0 <1.0 <1.0 <1.0 29.8
Duplicate TW4-65 <1.0 <1.0 <1.0 <1.0 29.5
12nd Qtr 6/8/2018 <1.0 <1.0 <1.0 <1.0 26.1
3rd Qtr 8/29/2018 <1.0 <1.0 <1.0 <1.0 31.0
Duplicate TW4-65 <1.0 <J.O <1.0 <1.0 31.0
14th Qtr 11/30/2018 <1.0 <1.0 <1.0 <1.0 27.4
DuDlicate TW4-65 <1.0 <1.0 .................. <1.0 <1.0 26.2
'i'stQtr 3/13/2019 <1.0 <1.0 <1.0 <1.0 25.5
2ndQtr 6/13/2019 <1.0 <1.0 <1.0 <1.0 27.4
Duplicate TW4-65 <1.0 <1.0 <1.0 <1.0 25.9
3rdQtr 9/11/2019 <1.0 <1.0 <1.0 <1.0 26.0
Duplicate TW4-65 <1.0 <1.0 <1.0 <1.0 22.1
4thQtr 12/12/2019 <1.0 <1.0 <1.0 <1.0 28
1stQtr 3/17/2020 <1.0 <1.0 <1.0 <1.0 2i:i
Duplicate TW4-65 <1.0 <1.0 <1.0 <1.0 26
2ndQtr 6/10/2020 <1.0 <1.0 <1.0 <1.0 26.2
Duplicate TW4-65 <1.0 <1.0 <1.0 <1.0 26.7
3rdQtr 9/17/2020 <1.0 <1.0 <1.0 <1.0 25.9
4thQtr 11/4/2020 <1.0 <1.0 <1.0 <1.0 24.9
1stQtr 3/17/2021 <1.0 <1.0 <1.0 <1.0 28.4
Duplicate TW4-65 <1.0 <1.0 <1.0 <1.0 27.6
2ndQtr 6/15/2021 <1.0 <1.0 <1.0 <1.0 27
Duplicate TW4-65 <1.0 <1.0 <1.0 <1.0 23.9
3rd Qtr 9/15/2021 <1.0 <1.0 <1.0 <1.0 20.3
Duplicate TW4-65 <1.0 <1.0 <1.0 <1.0 20.7
4thQtr 12/7/2021 <1.0 <1.0 <1.0 <1.0 26.2
Duplicate_TW-4-65 <1.0 <1.0 <1.0 <1.0 26.4
1stQtr 3/15/2022 <1.0 ~iO <1.0 <1.0 24.3
2ndQtr 6/15/2022 <1.0 <1.0 <1.0 <1.0 26.7
3rd Qtr 9/13/2022 <1.0 <1.0 <1.0 <1.0 27.3
NA= not analyzed
Shaded indicates concentrations exceedins:i GWQS.
Nitrate, Nitrate + Nitrite
110 mn/L\
3.5
3.7
3.5
~'~ 3.3
7.1
2.9
1.5
3.1
3.3
3.1
Vi. 2.8
2.9
2.7 ~& 2.5
2.9
2.8
?.ll.
2.8
3.0
3.1
~,-~
3.5
3.7
4.0
4.4
7.1
4.4
4.9
4.8
5.05
5.83
4.90
5.89
6.66
6.01
5.30
6.Q.?.
6.64
5.71
3.94
3.88
5.37
5.83
5.65
6.10
6.00
6.18
6.36
6.36
6.24
6.32
6.46
6.31
6.52
5.53
5.44
5.85
5.77
5.82
6.68
6.60
5.12
5.76
5.91
6.15
6.38
6.53
6.63
6.36
6.02
6.19
6.64
8.04
7.89
5.28
6.19
5.97
6.55
6.1
5.8
5.47
TABLE 1 (7 of 33)
Historic Summary Of Monitoring Well Analytical Results Up To The 3rd Quarter 2022
Chloroform Contamination Investigation
DUSA White Mesa Mill
TW4-4 {chloroform pumping well
stared1n1stqtr2010)
Sampling Event
Carbon Tetrachloride Chloroform Chloromethane
(5 ua/Ll 170 un/L\ 130 un/L\
1stQtr 3/16/2005 NA 3,100 NA
2ndQtr 5/25/2005 NA 2,400 NA
3rdQtr 8/31/2005 <10 3,200 <10
4thQtr 12/7/2005 <50 2 800 <50
1stQtr 3/9/2006 <50 2,900 <50
2ndQtr 6/14/2006 <50 2,600 <50
3rdQtr 7/20/2006 <50 2,850 <50
4th Qtr 11/812006 1.7 2 670 <1.0
1stQtr 212812007 1.5 2,200 <1.0
2nd Qtr 6127/2007 1.7 2,400 <1.0
3rdQtr 8/1512007 1.5 2,700 <1.0
4th Qtr 10/10/2007 1.5 2 500 <1.0
1stQtr 3/2812008 1.6 2,800 <1.0
2nd Qtr 612512008 1.5 2,500 <1.0
3rdQtr 9/1012008 1.4 2,200 <1.0
4th Qtr 1011512008 NA #NIA NA
1stQtr 11118/2008 <2.0 2 500 <2.0
1stQtr 31412009 1.2 2,200 <1.0
2nd Qtr 612312009 1.2 1,800 <1.0
3rd Qtr 911412009 1.1 2,000 <1.0
4th Qtr 1212912009 1.1 950 <1.0
1st Qtr (2) 211712010 ----------, ---,_700 <1.0 ______
2nd Qtr 611412010 1.2 1,700 <1.0
3rdQtr 8/1012010 1.3 2,100 <1.0
4thQtr 10/1512010 1.3 1 700 <1.0
1stQtr 212312011 1.4 1,800 <1.0
2nd Qtr 61112011 1.2 1,700 <1.0
3rdQtr 811712011 <1.0 1,500 <1.0
4thQtr 1111612011 1 1 500 <1.0
1st Qtr (1) 112312012 <1.0 1,200 <1.0
2nd Qtr -616/2012 <1.0 ---,.soc <1.0 ______
3rdQtr 91412012 1.2 1,600 <1.0
4thQtr 10/312012 1 1 400 <1.0
1stQtr 211112013 1 1,460 <1.0
2nd Qtr 6/2912013 <1.0 1,330 <1.0
3rdQtr 91312013 1.2 1,380 <1.0
4thQtr 1012312013 5.3 1 360 <1.0
1stQtr 1/2712014 3.88 1,260 <1.0
2nd Qtr 511912014 4.94 1,220 <1.0
3rdQtr 8/1112014 4.94 1,320 7.1
4th Qtr 10121/2014 <1.0 1,130 <1.0
1st Qtr (4) 31912015 1.05 ---,,350 <1.0 ______
2ndQtr 6/1012015 <1.0 1,280 <1.0
3rdQtr 8/3112015 <1.0 1,220 1.72
4thQtr 10/19/2015 <1.0 1190 <1.0
1stQtr 319/2016 <1.0 1,190 <1.0
2nd Qtr 5123/2016 1.21 1,780 <1.0
3rdQtr 7127/2016 <1.0 1 380 <1.0
4thQtr 10/13/2016 <1.0 1 430 <1.0
1stQtr 318/2017 <1.0 1,290 <1.0
2nd Qtr 611312017 <1.0 1,290 <1.0
3rdQtr 712612017 <1.0 1,290 <1.0
4thQtr 1011112017 <1.0 1 120 <1.0
1st Qtr 3112/2018 <1.0 ___ _!,_!6.Q <1.0
<1.0 ----------·------2nd Qtr (3) 61812018 1,050 <1.0
3rd Qtr 812212018 <1.0 1,030 <1.0
4thQtr 1112812018 <1.0 1140 <1.0
1st0tr 31812019 <1.0 1,050 <1.0
2nd Qtr 61512019 <1.0 1,070 <1.0
3rd Qtr 91412019 <_1.0 989 <1.0
4thQtr 1211012019 <1.0 1 140 <1.0
1stQtr 211912020 <1.0 1,100 <1.0
2nd Qtr 512712020 <1.0 1,140 <1.0
3rdQtr 91412020 <1.0 1,110 <1.0
4thQtr 1012812020 <1.0 979 <1.0
1stQtr 212312021 <1.0 1,130 <1.0
2nd Qtr 61912021 <1.0 1,240 <1.0
3rdQtr 812412021 <1.0 1,100 <1.0
4thQtr 121112021 <1.0 950 <1.0
1stQtr 31912022 <1.0 1,010 <1.0
2nd Qtr 61812022 <1.0 1,110 <1.0
3rdQtr 8/3012022 <1.0 1 040 <1.0
(1) As of March 2012 both north and south wild hfep~nds no long:'" receIvin,2 water
(2) 1W4-4 converted to a Chloroform pumpI'!2. well stared m 1st qtr 2010 __ .
J~ TW4-41 installed as a Chloroform...eum.2,1'lS well stared In MyyJ018 ---· J'!l TW4-2 converted to a chloroform .e,ume!.ni. well started m 1/14/15 __ --·
NA and #N/A(for graph use)= not analyzed
Shaded indicates concentrations exceeding GWQS
Bold and italics indicates the MDL exceeded the GWQS.
Parameter
IGWQS\
Methylene Chloride
(5 uo/Ll
NA
NA
<10
<50
<50
<50
<50
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
NA
<2.0
<1.0
<1.0
<1.0
<1.0
<1.0 --------
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0 -------
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0 -------
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0 ---
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
Chloride
No GWQS C mo/Ll
NA
NA
NA
54
51
48
50
49
49
47
45
47
43
42
39
44
NA
37
34
39
41 --------48
35
36
38
41
35
40
39
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
40.2
40.3
41.7
40.7
40.5
40.7
42.2
39.0
44.6
41.4
38.3
38.5
39.4
40.4
43.4
46.1
40.0
38.6
39.8
39.4
39.6
42.5
37.1
39.9
41.0
Nitrate, Nitrate + Nitrite
(10 mo/LI
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
#NIA
10.2
8.2
8.4 ___________ !~
6.6
7.6
7.3
7.1
7.0
7.0
6.6
7.0
7.1
i.i"
7.1
7.0
7.36
6.30
7.22
7.84
7.28
5.91
5.3
----------7P~ 7.7
6.33
6.45
6.27
6.7
6.56
7.22
6.77
6.87
7.06
6.47
6.90
----------6}~ 6.34
6.10
6.02
7.26
10.40
6.32
6.52
4.58
7.26
7.04
6.77
6.75
9.02
4.00
7.32
6.6
6.0
6.65
TABLE 1 (8 of 33)
Historic Summary Of Monitoring Well Analytical Results Up To The 3rd Quarter 2022
Chloroform Contamination Investigation
DUSA White Mesa Mill
TW4-5 Parameter
Sampling Event IGWQSI
Carbon Tetrachloride Chloroform Chloromethane Methylene Chloride
15 uo/L\ 170 ua/L\ 130 ua/L\ 15 ua/LI
1stQtr 3/16/2005 NA 120 NA NA
2nd Qtr 5/25/2005 NA 113 NA NA
3rd Qtr 8/31/2005 <2.5 82 5.8 <2.5
4thQtr 12/7/2005 <2.5 63 2.5 <2.5
1stQtr 3/9/2006 <2.5 66 i 'i' <2.5
2nd Qtr 6/14/2006 <2.5 51 3.1 <2.5
3rd Qtr 7/20/2006 <1.0 53.7 <1.0 <1.0
4th Qtr 11/8/2006 <1.0 47.1 <1.0 <1.0
1stQtr 2/28/2007 <1.0 35 <1.0 <1.0
2nd Qtr 6/27/2007 <1.0 26 <1.0 <1.0
3rdQtr 8/15/2007 <1.0 9.2 <1.0 <1.0
4thQtr 10/10/2007 <1.0 9.4 <1.0 <1.0
1stQtr 3/28/2008 <1.0 11 <1.0 <1.0
2nd Qtr 6/25/2008 <1.0 9.3 <1.0 <1.0
3rd Qtr 9/10/2008 <1.0 11 <1.0 <1.0
4thQtr 10/15/2008 <1.0 10 <1.0 <1.0
1stQtr 314/2009 <1.0 12 <1.0 <1.0
2ndQtr 6/23/2009 <1.0 13 <1.0 <1.0
3rdQtr 9/14/2009 <1.0 12 <1.0 <1.0
4thQtr 12/29/2009 <1.0 8.5 <1.0 <1.0
1stQtr 2/25/2010 <1.0 13 <1.0 <1.0
2ndQtr 6/14/2010 <1.0 12 <1.0 <1.0
3rdQtr 8/11/2010 <1.0 12 <1.0 <1.0
4thQtr 10/15/2010 <1.0 11 <1.0 <1.0
1sIQtr 2/22/2011 <1.0 10 <1.0 <1.0
2nd Qtr 5/26/2011 <1.0 9 <1.0 <1.0
3rd Qtr 8/7/2011 <1.0 10 <1.0 <1.0
4thQtr 11/16/2011 NA #N/A NA NA
.. HI 1217/2011 <1.0 7.9 <1.0 <1.0
isl Qtr (2) 1/18/2012 <1.0 7.6 <1.0 <1.0
2nd Qtr -6/6/2012 <1.0 ----aA <1.0 ______
<1.0
3rd Qtr 9/11/2012 <1.0 12.0 <1.0 <1.0
4th Qtr 10/4/2012 <1.0 8.0 <1.0 <1.0
1stQtr 21fai2013 <1.0 10.8 <1.0 <1.0
2nd Qtr 6/13/2013 <1.0 11.2 <1.0 <1.0
3rdQtr 9/5/2013 <1.0 11.6 <1.0 <1.0
4thQtr 11/13/2013 <1.0 14.4 <1.0 <1.0
1stQtr 1/30/2014 <1.0 12.5 <1.0 <1.0
2ndQtr 5/22/2014 <1.0 13.4 <1.0 <1.0
3rdQtr 8/14/2014 <1.0 12.0 <1.0 <1.0
4thQtr 10/13/2014 <1.0 14.6 <1.0 <1.0
1stQtr 3/12/2015 <1.0 13.8 <1.0 <1.0
Duplicate TW4-70 <1.0 13.8 <1.0 <1.0
2nd Qtr 6/10/2015 <1.0 13.3 1.07 <1.0
3rdQtr 9/10/2015 <1.0 12.9 <1.0 <1.0
4thQtr 10/28/2015 <1.0 11.0 <1.0 <1.0
1stQtr 3/17/2016 <1.0 11.0 <1.0 <1.0
2nd Qtr 5/23/2016 <1.0 13.6 <1.0 <1.0
3rdQtr 8/3/2016 <1.0 10.8 <1.0 <1.0
4th Qtr (3) 10/26/2016 <1.0 9.9 <1.0 <1.0
0.!:;!_p}itateTW4-75 _____ <1.0 12.0 <1.0 <1.0
1sIQtr 3/15/2017 <1.0 ------zrs <1.0 ______ <1.0 --------
2nd Qtr 6/15/2017 <1.0 14.6 <1.0 <1.0
3rdQtr 8/8/2017 <1.0 14.6 <1.0 <1.0
4thQtr 10/11/2017 <1.0 13.8 <1.0 <1.0
pWMRC s lit samnle <0.19 12 <0.3 <0.32
1st Ctr 3/12/2018 <1.0 15.2 <1.0 <1.0
2nd Qtr 6/13/2018 <1.0 13.9 <1.0 <1.0
3rd Qtr 8/30/2018 <1.0 15.4 <1.0 <1.0
Duphcate TW4· 70 <1.0 15.3 <1.0 <1.0
4thQtr 11/28/2018 <1.0 15.6 <1.0 <1.0
Duollcate TW4-70 <1.0 16.2 <1.0 <1.0
·1·s1atr 3/16/2019 <1.0 14.1 <1.0 <1.0
2nd Qtr 6/13/2019 <1.0 15.8 <1.0 <1.0
3rd Qtr 9/11/2019 <1.0 14.6 <1.0 <1.0
Duphcate TW4-70 <1.0 13.6 <1.0 <1.0
4thQtr 12/14/2019 <1.0 15.7 <1.0 <1.0
Duplicate TW4-70 <1.0 16.0 <1.0 <1.0
·1·s1atr 3/17/2020 <1.0 14.8 <1.0 <1.0
Duplicate TW4· 70 <1.0 14.8 <1.0 <1.0
2nd Qtr 6/11/2020 <1.0 15.4 <1.0 <1.0
3rd Ctr 9/18/2020 <1.0 14.8 <1.0 <1.0
4thQtr 11/4/2020 <1.0 15.6 <1.0 <1.0
1st Ctr 3/18/2021 <1.0 12.9 <1.0 <1.0
2nd Qtr 6/16/2021 <1.0 13.0 <1.0 <1.0
3rdQtr 9/22/2021 <1.0 11.2 <1.0 <1.0
4thQtr 12/8/2021 <1.0 12.4 <1.0 <1.0
1stQtr 3/23/2022 <1.0 11.0 <1 .0 <1.0
2ndQtr 6/16/2022 <1.0 10.3 <1.0 <1.0
3rdQtr 9/14/2022 <1.0 13.2 <1 .0 <1.0
( 1) voes were resampled because laboratory missed holding time.
J2) As of March 2012 both north and south wild life ponds no IOA9!'" receIvIn_a water
(3) chloroform _eum.£!'"!2 well 1W4-39 started In 11/20/16 __ ,
NA and #N/A{for Rraphs) = not analyzed
Shaded indicates concentrations exceedinR GWQS.
Chloride
No GWQS Ima/LI
NA
NA
NA
56
52
51
54
55
57
45
38
39
36
37
34
37 34
37
48
41
43
28
38
41
34
35
37
30
NA
22 ---------39
37
38
34.3
36.5
39.1
41.1
40.5
51.4
44
45.1
45.1
46.4
47.3
52.2
43.6
44.7
45.9
44.6
47.8
49.5
44.7
47.3
48.6
42.5
47
51.2
47.3
54.7
55.9
49.8
48.5
47.6
49.3
46.1
45.8
53.1
52.5
48.3
48.4
49.5
47.0
50.2
46
50.8
39.8
51.3
47.7
40.7
45.8
Nitrate, Nitrate + Nitrite
110 ma/Ll
4.9
3.7
6.0
6.0
6.0
5.9
6.7
2.9
7.8
7.0
7.7
8.2
7.4
8.7
7.9
9.3
7.9
7.5
8.3
7.5
6.8
7.1
7.0
7.2
7.0
7.2
7.5
6.0
#NIA
5.8
8.0
8.1
7.7
8.24
10.70
7.79
7.75
9.16
7.78
7.2
8.31
9.32
8.81
7.08
8.1
8.03
10.2
8.98
8.49
8.32
8.34
8.49
8.52
8.52
8.57
8.6
8.36
9.24
7.34
7.28
7.67
7.80
7.38
7.62
7.04
6.89
6.97
7.29
7.10
7.72
7.83
6.37
6.19
7.43
8.11
6.63
6.71
7.3
7.1
7.22
TABLE 1 (9 of 33)
Historic Summary Of Monitoring Well Analytical Results Up To The 3rd Quarter 2022
Chloroform Contamination Investigation
DUSA White Mesa Mill
TW4-6 Parameter
Sampling Event IGWQS)
Carbon Tetrachloride Chloroform Chloromethane Methylene Chloride
15 ua/Ll 170 ua/Ll 130 ua/Ll 15 ua/Ll
1stQtr 3/16/2005 NA <1.0 NA NA
2nd Qtr 5/25/2005 NA 2.5 NA NA
3rd Qtr 8/31/2005 <1.0 10 2.8 <1.0
4th Qtr 12/7/2005 <1.0 17 1.3 <1.0
1stQtr 3/9/2006 <1.0 31 <1.0
2nd Qtr 6/14/2006 <1.0 19 <1.0
3rdQtr 7/20/2006 <1.0 11 <1.0
4th Qtr 11/8/2006 <1.0 42.8 <1.0
1stQtr 2/28/2007 <1.0 46 <1.0
2nd Qtr 6/27/2007 <1.0 11 <1.0
3rdQtr 8/15/2007 <1.0 18 <1.0
4thQtr 10/10/2007 <1.0 18 <1.0
1stQtr 3/28/2008 <1.0 52 <1.0
2nd Qtr 6/25/2008 <1.0 24 <1.0
3rdQtr 9/10/2008 <1.0 39 <1.0
4thQtr 10/15/2008 <1.0 37 <1.0
1stQtr 3/4/2009 <1.0 81 <1.0
2nd Qtr 6/23/2009 <.1 .. 0 .... 120 <1 .0
3rdQtr 9/14/2009 <1.0 280 -~·:i:'if".
4th Qtr 12/29/2009 <1.0 250 21.0 ------<1.0 -----1st Qtr (5) 2/25/201 0 1000 <1.0
2nd Qtr 6/14/2010 <1.0 590 <1.0
3rd Qtr 8/11/2010 <1.0 630 <1.0
4thQtr 10/15/2010 <1.0 420 <1.0
1stQtr 2/22/2011 <1.0 47 <1 .0
2nd Qtr 5/26/2011 <1.0 9.6 <1 .0
3rd Qtr 8/7/2011 <1.0 16 <1.0
4th Qtr 11/16/2011 NA #N/A NA
(1) 12/7/2011 <1.0 21 <1.0
.... .l?' 11/16/2011 <1.0 50 <1.0
1st Qtr (4) 1/18/2012 <1.0 38 <1.0 ~--------2nd Qtr 6/6/2012 <1.0 4.7 <1.0
3rd Qtr 9/11/2012 <1.0 6.9 <1.0
4thQtr 10/4/2012 <1.0 9 <1.0
1stQtr 2/13/2013 <1.0 6.89 <1.0
2nd Qtr 6/13/2013 <1.0 4.86 <1.0
3rdQtr 9/5/2013 <1.0 5.93 <1.0
4thQtr 11/13/2013 <1.0 5.51 <1.0
1stQtr 1/29/2014 <1.0 5.7 <1.0
2nd Qtr 5/22/2014 <1.0 10.3 <1.0
3rdQtr 8/14/2014 <1.0 202 <1.0
(3) 9/24/2014 <1.0 260 <1.0
4thQtr 10/29/2014 <1.0 723 <1.0
1stQtr 3/12/2015 <1.0 1,180 <1.0
2ndQtr 6/10/2015 <1.0 1,040 <1.0
3rdQtr 9/10/2015 <1.0 1,040 <1 .0
4thQtr 10/29/2015 <1.0 843 <1.0
1stQtr 3/22/2016 <1.0 834 <1.0
2nd Qtr 6/8/2016 <1.0 486 <1 .0
3rdQtr 7/27/2016 <1.0 433 <1 .0
4thQtr 10/26/2016 <1.0 301 <1.0
1stQtr 3/16/2017 <1.0 288 <1.0
2nd Qtr 6/21/2017 <1.0 239 <1.0
3rdQtr 8/8/2017 <1.0 129 <1.0
4thQtr 10/11/2017 <1.0 121 <1.0
1stQtr 3/20/2018 <1.0 159 <1 .0
2nd Qtr (6) 6/14/2018 <1.0 -------------74] <1.0 ______
3rdQtr 9/5/2018 <1.0
4thQtr 12/12/2018 <1.0
1stQtr 3/19/2019 <1 .0
2ndQtr 6/13/2019 <1.0
3rdQtr 9/11/2019 <1.0
4thQtr 12/14/2019 <1.0
1stQtr 3/17/2020 <1 .0
2ndQtr 6/11/2020 <1 .0
3rdQtr 9/18/2020 <1.0
4thQtr 11/4/2020 <1 .0
1stQtr 3/18/2021 <1 .0
2nd Qtr 6/16/2021 <1.0
3rdQtr 9/15/2021 <1.0
4thQtr 12/8/2021 <1.0
1stQtr 3/22/2022 <1.0
2nd Qtr 6/16/2022 <1.0
3rdQtr 9/14/2022 <1 .0
(1) VOCs were resampled because laboratory missed holding ttme.
(2) Results of the TW4-70 the duplicate sample for TW4-6.
(3) Reanalyzed for voes only.
53.2 <1.0
37.0 <1 .0
23.2 <1 .0
15.8 <1 .0
15.8 <1 .0
7.4 <1.0
6.93 <1.0
4.9 <1.0
3.6 <1.0
4.61 <1 .0
3.78 <1.0
2.9 <1.0
3.71 <1.0
3.92 <1.0
3.10 <1.0
2.1 <1.0
3.90 <1.0
(4) As of March 2012 both north and south wild llfeponds no IOJl9;'" receIvm.,2. water
(5) Chloroform_pum.£1~ well TW4-4 stared In 1st qtr 2010 _,
(6) Chloroform_pumpI!!il well TW4-41 installed Ma1, 2018 __ ,
NA and #N/Al,for graphs)= not analyzed
Shaded indicates concentrations exceeding GWQS
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0 <1.0 --------
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
NA
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0 <1.0 -------
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
Chloride
No GWQS lma/Ll
NA
NA
NA
32
31
30
37
65
32
38
36
35
33
35
35
33
35
37
37
41 ---------45
33
31
41
40
42
39
36
NA
33
38 -------40
21
41
40.4
37.9
40.6
40.2
40.6
37
40
NA
41.1
41.2
41.6
47
40.2
42.3
44.1
42.2
46.1
42.1
42.6
42.9
37.6
43.1
40.2
44
20.0
41
38.1
39.7
45.7
43.2
42.4
40.5
42.9
41.6
43.8
34.1
44.8
31.5
43.1
38.7
Nitrate, Nitrate + Nitrite
110 ma/LI
0.2
0.4
0.8
0.9
1.2
1.0
0.6
1.4
1.8
0.6
0.7
0.8
1.1
0.9
1.1
1.0
2.2
2.7
5.0
· 6.1 -----------~.;. 1.8
2.5
3.9
4.3
0.7
0.3
0.3
0.8
#N/A
0.8
0.7 ------------0.2
0.1
0.2
0.2
0.2
0.2
1.5
0.2
0.3
4.2
#N/A
6.9
5.3
5.9
6.8
5.6
6.79
3.19
3.85
3.74
3.15
2.42
1.71
1.71
1.96
1.48
1.18
0.90
0.755
0.484
0.412
0.244
0.222
0.205
0.144
0.197
0.205
0.215
0.166
<0.100
0.1
0.21
0.144
TABLE 1 (10 of 33)
Historic Summary Of Monitoring Well Analytical Results Up To The 3rd Quarter 2022
Chloroform Contamination Investigation
OUSA White Mesa Mill
TW4-7
Sampling Event
Carbon Tetrachloride Chloroform Chloromethane
{5 ua/Ll {70 un/Ll 130 un/Ll
1stQtr 3/16/2005 NA 3,100 NA
2nd Qtr 5/25/2005 NA 2,700 NA
3rdQtr 8/31/2005 <10 3,100 <10
4thQtr 12/7/2005 <50 2 500 <50
1stQtr 3/9/2006 <50 1,900 <50
2nd Qtr 6/14/2006 <50 2,200 <50
3rdQtr 7/20/2006 <50 2,140 <50
4thQtr 11/8/2006 1.5 2 160 <1 .0
1stQtr 2/28/2007 1.1 1,830 <1.0
2nd Qtr 6/27/2007 1.5 2,600 <1.0
3rdQtr 8/15/2007 1.4 2,300 <1.0
4thQtr 10/10/2007 1.2 1 900 <1.0
1st0tr 3/28/2008 1.3 2,200 <1.0
2nd Qtr 6/25/2008 1.3 1,800 <1.0
3rdQtr 9/10/2008 1.4 1,600 <1.0
4thQtr 10/15/2008 NA #NIA NA
11/18/2008 <2.0 2 500 <2.0
1stQtr 3/11/2009 1.2 1,800 <1.0
2nd Qtr 6/23/2009 <1.0 1,400 <1.0
3rdQtr 9/14/2009 1 1,500 <1.0
4thQtr 12/29/2009 <1.0 1 300 <1.0
1stQtr 2/25/2010 <1.0 1,200 <1.0
2nd Qtr 6/14/2010 <1.0 1,100 <1.0
3rd Qtr 8/11/2010 1 1,500 <1.0
Qtr 10/15/2010 <1.0 1 100 <1.0
Qtr 2/23/2011 <1.0 1,300 <1.0
d Qtr 6/1/2011 <1.0 1,200 <1.0
dQtr 8/18/2011 <1.0 1,200 <1.0
Ot, 11/29/2011 <1.0 1 000 <1.0 atr<1L __ 111912012 <1.0 1,000 <1.0
<1.0 -----790
.,_ ________
Qtr 6/14/2012 <1.0
Qtr 9/13/2012 <1.0 870 <1.0
Qtr 10/4/2012 <1.0 940 <1.0
stQtr 2/13/2013 <1.0 940 <1.0
nd Qtr 6/18/2013 <1.0 953 <1.0
rd Qtr 9/12/2013 <1.0 1,040 <1 .0
hQtr 11/14/2013 <1.0 1 050 <1.0
1stQtr 2/5/2014 5.41 946 <1.0
2nd Qtr 5/22/2014 4.78 847 <1.0
3rdQtr 8/27/2014 <1.0 857 1.5
4th Qtr 10/30/2014 <1.0 926 <1.0
<1.0 --------942 ~-------1st Qtr (2) 3/18/2015 <1.0
2nd Qtr 6/11/2015 <1.0 950 <1.0
3rdQtr 9/10/2015 <1.0 897 <1.0
4thQtr 10/29/2015 <1.0 847 <1.0
1stQtr 3/22/2016 <1.0 834 <1.0
2nd Qtr 6/8/2016 <1.0 909 <1.0
3rd Qtr 8/4/2016 <1.0 1,QOO <1 .0
4th Qtr 10/26/2016 <1.0 886 <1.0
1stQtr 3/21/2017 <1.0 986 <1.0
2nd Qtr 6/21/2017 <1.0 968 <1.0
3rdQtr 8/4/2017 <1.0 1,070 <1.0
4thQtr 10/11/2017 <1.0 884 <1.0
DWMRC split sample <7.6 890 <12
1stQtr 3/21/2018 <1.0 721 <1.0
2nd Qtr 6/14/2018 <1.0 751 <1.0
3rdQtr 9/6/2018 <1.0 781 <1.0
4thQtr 12/13/2018 <1.0 838 <1.0
1stQtr 3/20/2019 <1.0 736 <1.0
2nd Qtr 6/19/2019 <1.0 862 <1.0
3rdQtr 9/12/2019 <1.0 801 <1.0
4thQtr 12/18/2019 <1.0 546 <1.0
1stQtr 3/18/2020 <1.0 746 <1.0
2nd Qtr 6/12/2020 <1.0 864 <1.0
Deplicate TW4•75 <1.0 871 <1.0
3rd Qtr 9/19/2020 <1.0 971 <1.0
4thQtr 11/11/2020 <1.0 967 <1.0
n1Mucr-s tit samole <10 930 <20
1stQtr 3/24/2021 <1.0 875 <1.0
2nd Qtr 6/17/2021 <1.0 819 <1.0
3rdQtr 9/23/2021 <1.0 801 <1.0
4th Qtr 12/9/2021 <1.0 868 <1.0
1stQtr 3/24/2022 <1.0 776 2.1
2nd Qtr 6/22/2022 <1.0 447 <1 .0
3rdQtr 9/15/2022 <1.0 887 <1.0
(1) As of March 2012 both north and south wild llfeponds no IOfl9!'" rece1v11!2_ water
j~ chloroform _eume~ wells TW4~1 and TW4•2 started m 1/14/15 ____ -·
NA and #NIA/for ~raphs) = not analyzed
Shaded indicates concentrations exceedin~ GWQS.
Bold and italics indicates the MDL exceeded the GWQS
J = Approximated value
Parameter
iGWQSl
Methylene Chloride
15 ua/Ll
NA
NA
<10
<50
<50
<50
<50
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
NA
<2.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0 -----
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0 -------
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
17 J
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<20
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
Chloride
No GWQS Ima/LI
NA
NA
NA
52
48
47
51
49
47
45
44
45
43
43
35
40
NA
35
37
37
37
35
31
36
38
45
35
37
37
37 ------41
40
41
37.7
39.3
36.4
37.2
38.2
37.7
39
40.2
40.4
42.1
46.7
40.6
42.4
44.1
42.3
45.8
40.5
43.3
44.7
43.7
42.0
44.5
41.5
48.5
42.8
41.3
43.0
39.6
47.2
42.1
44.1
43.1
41.5
42.8
43
46.2
41.7
42.8
42.9
41.3
42.5
45
Nitrate, Nitrate + Nitrite
110 ma/Ll
5.2
5.4
5.2
5.3
1
4.5
4.7
4.6
6
5.1
4.7
4.7
4.2
4.8
4.16
4.01
#N/A
3.7
3.8
4.1
4.2
3.8
3.9
3.9
4
3.6
4.0
4.1
3.8
3.9
4.0
3.8
3.8
3.51
4
4.17
4.13
4.24
4.19
2.9
----------3:6~ 4.25
2.62
4.72
3.49
4.43
3.75
4.21
4.33
3.87
4.15
4.20
4.35
4.30
3.96
4.45
4.34
3.98
4.01
4.19
3.76
3.11
3.75
4.06
4.19
3.87
4.40
3.90
4.25
4.80
4.58
3.02
4.1
3.9
3.77
TW4-8
Sampling Event
TABLE 1 (11 of 33)
Historic Summary Of Monitoring Well Analytical Results Up To The 3rd Quarter 2022
Chloroform Contamination Investigation
□USA White Mesa Mill
Parameter
IGWQSl
Carbon Tetrachloride Chloroform Chloromethane Methylene Chloride Chloride Nitrate, Nitrate + Nitrite
15 ua/Ll 170 un/LI 130 un/LI 15 ua/Ll No GWQS lma/Ll 110 ma/Ll
1st Cir 3/1612005 NA 10 NA NA NA <0.1
2nd Qtr 512512005 NA <1.0 NA NA NA 0.2
3rdQtr 8131/2005 <1 .0 1.1 1.7 NA NA <1.0
4thQtr 121712005 <1.0 <1.0 <1.0 <1.0 41 <1.0
1stQtr 3/9/2006 <1 .0 1.3 2.1 <1.0 39 0.3
2nd Qtr 6114/2006 <1 .0 1.8 1.0 <1.0 37 <1 .0
3rdQtr 7120/2006 <1.0 <1.0 <1.0 <1.0 39 0.1
4thQtr 11/812006 <1 .0 <1.0 <1.0 <1.0 40 <.1
1stQtr 212812007 <1.0 2.5 <1.0 <1.0 39 0.7
2nd Qtr 612712007 <1.0 2.5 <1.0 <1.0 42 0.2
3rdQtr 811512007 <1.0 1.5 <1 .0 <1.0 42 <1.0
4thQtr 1011012007 <1.0 3.5 <1.0 <1.0 43 0.5
1stQtr 3/2812008 <1.0 <1.0 <1.0 <1.0 46 0.1
2nd Qtr 612512008 <1.0 <1.0 <1.0 <1.0 45 <1.0
3rdQtr 9/1012008 <1 .0 <1.0 <1.0 <1.0 39 <0.05
4thQtr 1011512008 <1.0 <1.0 <1.0 <1.0 44 <0.05
1stQtr 3/412009 <1 .0 <1.0 <1.0 <1.0 42 <0.1
2nd Qtr 6/2312009 <1.0 <1 .0 <1.0 <1.0 44 <0.1
3rdQtr 9114/2009 <1.0 <1.0 <1 .0 <1.0 44 <0.1
4thQtr 1211712009 <1 .0 <1.0 <1.0 <1.0 51 <0.1
1stQtr 212412010 <1.0 <1.0 <1.0 <1.0 57 <0.1
2nd Qtr 611412010 <1.0 <1.0 <1.0 <1.0 42 <0.1
3rdQtr 8118/2010 <1 .0 <1.0 <1.0 <1.0 45 <0.1
4thQtr 1011512010 <1 .0 <1.0 <1.0 <1.0 46 0.1
1stQtr 211612011 <1.0 <1.0 <1.0 <1.0 52 <0.1
2nd Qtr 512512011 <1.0 <1.0 <1.0 <1.0 45 0.1
3rd Qtr 811612011 <1.0 <1.0 <1.0 <1.0 46 0.1
4thQtr 1111612011 45 0.2
_[1\ 121712011 <1.0 <1.0 <1.0 <1.0 NA #NIA
1st Qtr (3) 111812012 <1.0 <1.0 <1.0 <1 .0 45 0.3
2nd Qtr 511312012 <1.0 <1.0 ____ <1.0 ______ <1.0. -------44 0.2
3rdQtr 8/2912012 <1.0 <1.0 <1.0 <1.0 48 0.1
4thQtr 101312012 <1.0 <1.0 <1.0 <1 .0 47 <0.1
1stQtr 21712013 <1.0 <1.0 <1.0 <1 .0 46.6 0.41
2ndQtr 513012013 <1.0 <1.0 <1.0 <1.0 45.5 <0.1
3rdQtr 91512013 <1.0 <1.0 <1.0 <1.0 47.5 0.1
4thQtr 111712013 <1.0 <1.0 <1.0 <1.0 46.1 <0.1
1stQtr 112312014 <1.0 63.8 <1.0 <1.0 48.5 0.166
(2) 21612014 <1.0 100 <1.0 <1 .0 46.5 0.166
2ndQtr 512212014 <1.0 122 <1.0 <1.0 53 0.538
3rdQtr 8/2712014 <1.0 107 <1.0 <1 .0 47 0.6
4th Qtr 1012912014 <1.0 191 <1.0 <1.0 46.7 0.914
1st Qtr (4) 311212015 <1.0 -------------961 <1.0 ______ <1.0 49.6 2.3
2ndQtr 6/1112015 <1.0 981 <1.0 <1.0 53 1.88
3rdQtr 9/1012015 <1.0 747 <1.0 <1 .0 59.6 1.96
4thQtr 1012912015 <1.0 770 <1.0 <1.0 52 2.2
1stQtr 311712016 <1.0 634 <1.0 <1 .0 54.2 2.48
2ndQtr 61812016 <1.0 595 <1.0 <1.0 58.7 2.14
3rdQtr 81412016 <1.0 522 <1.0 <1 .0 56.9 2.10
4thQtr 10/2712016 <1.0 472 <1.0 <1.0 60.1 2.16
1stQtr 312112017 <1.0 359 <1.0 <1.0 57.4 2.06
2ndQtr 6121/2017 <1.0 256 <1.0 <1 .0 58.8 1.97
3rdQtr 81412017 <1.0 223 <1.0 <1 .0 61 .2 1.64
4thatr ..... 1011112017 <1.0 214 <1.0 <1.0 52.2 1.92
Deplicate lW4-75 <1.0 194 1.12 <1.0 56.2 1.71
DWMRC solit sample <1.9 230 4.7 J <3.0 61 1.90
1stQtr 312112018 <1.0 220 <1.0 <1.0 60.8 1.36
Deplicate lW4-75 <1.0 171 <1.0 <1.0 60.8 1.36
2nd Qtr 611412018 <1.0 155 <1.0 <1.0 53.8 1.31
3rdQtr 91512018 <1.0 137 <1.0 <1.0 63.2 1.40
4thQtr 1211312018 <1.0 93.8 <1.0 <1.0 53.1 1.35
1stQtr 3/1912019 <1.0 103 <1.0 <1.0 54.3 1.23
2nd Qtr 611912019 <1.0 96 <1.0 <1.0 56.5 1.1
3rdQtr 9112/2019 <1.0 75.4 <1.0 <1.0 52 0.999
Deplicate lW4-75 <1.0 75.6 <1.0 <1.0 52.5 1.030
4thQtr 1211812019 <1 .0 84.4 <1.0 <1.0 60.1 1.21
1stQtr 311812020 <1.0 55.0 <1.0 <1.0 53.8 1.04
2nd Qtr 611212020 <1.0 53.8 <1.0 <1.0 56.9 1.06
3rdQtr 9118/2020 <1.0 39.5 <1.0 <1.0 52.6 0.894
4thQtr 1111112020 <1.0 51 .3 <1.0 <1.0 54.7 1.27
Deplicate lW4-70 <1.0 52.9 <1.0 <1.0 49.9 1.27
DWMRC split samnle <10 50.0 <20 <20 56 0.16 H
1stQtr 3/1812021 <1.0 26.9 <1.0 <1 .0 52.8 1.00
2nd Qtr 6/1612021 <1.0 22.3 <1.0 <1.0 51 .5 1.12
3rdQtr 912212021 <1.0 17.0 <1.0 <1.0 40.8 0.665
Deplicate lW4-70 <1.0 16.4 <1.0 <1.0 43.1 0.59
4thQtr 12/812021 <1.0 17.2 <1.0 <1,0 54.9 0.738
1stQtr 3/2312022 <1.0 15.1 <1.0 <1.0 50.8 0.8
2nd Qtr 6/1612022 <1.0 10.9 <1.0 <1.0 52.8 0.64
3rdQtr 911412022 <1.0 15.3 <1.0 <1.0 52.5 0.718
(1) voes were resampled because laboratory missed holding time
(2) Resampled to verify chloroform concentration that was collected on 1123/14.
(3) As of March 2012 both north and south wild llfeponds no I0}'\9;'" rece1vin..2, water
J4) chloroform _£Um.f.!'!i wells lW4-1 and TW4-2 started m 1/14/15 _____ ,
NA and #N/A(for graphs)= not analyzed
Shaded indicates concentrations exceeding GWQS
J = Approximated value
H = Sample was analyzed beyond holding times and may not be accureate concentration
TABLE 1 (12 of 33)
Historic Summary Of Monitoring Well Analytical Results Up To The 3rd Quarter 2022
Chloroform Contamination Investigation
DUSA White Mesa Mill
TW4-9 Parameter
Sampling Event IGWQSI
Carbon Tetrachloride Chloroform Chloromethane Methylene Chloride
15 uo/Ll 170 uo/Ll 130 uo/Ll
1stQtr 3/16/2005 NA 3.8 NA NA
2nd Qtr 5/25/2005 NA 1.2 NA NA
3rd Qtr 8/31/2005 <1.0 <1.0 2.9 <1.0
4thQtr 12/7/2005 <1.0 <1.0 <1.0 <1.0
1stQtr 3/9/2006 <1.0 <1.0 2.6 <1.0
2ndQtr 6/14/2006 <1.0 19 2.7 <1.0
3rdQtr 7/20/2006 <1.0 <1.0 <1.0 <1.0
4thQtr 11/8/2006 <1.0 <1.0 <1.0 <1.0
1stQtr 2/28/2007 <1.0 <1.0 <1.0 <1.0
2ndQtr 6/27/2007 <1.0 21 <1.0 <1.0
3rd Qtr 8/15/2007 <1.0 9.5 <1.0 <1.0
4thQtr 10/10/2007 <1.0 8.7 <1.0 <1.0
1stQtr 3/28/2008 <1.0 1.3 <1.0 <1.0
2nd Qtr 6/25/2008 <1.0 1 <1.0 <1.0
3rd Qtr 9/10/2008 <1.0 <1.0 <1.0 <1.0
4th Qtr 10/15/2008 <1.0 <1.0 <1.0 <1.0
1st Qtr 3/4/2009 <1.0 <1.0 <1.0 <1.0
2nd Qtr 6/23/2009 <1.0 <1.0 <1.0 <1.0
3rdQtr 9/14/2009 <1.0 <1.0 <1.0 <1.0
4thQtr 12/17/2009 <1.0 <1.0 <1.0 <1.0
1stQtr 2/23/2010 <1.0 <1.0 <1.0 <1.0
2nd Qtr 6/14/2010 <1.0 <1.0 <1.0 <1.0
3rd Qtr 8/13/2010 <1.0 <1.0 <1.0 <1.0
1.thQtr 10/15/2010 <1.0 <1.0 <1.0 <1.0
1stQtr 2/17/2011 <1.0 <1.0 <1.0 <1.0
2nd Qtr 5/25/2011 <1.0 <1.0 <1.0 <1.0
3rd Qtr 8/16/2011 <1.0 <1.0 <1.0 <1.0
4th Qtr 11/16/2011 NA NA NA NA
.l1l 12/7/2011 <1.0 <1.0 <1.0 <1.0
1st Qtr (2) 1/18/2012 <1.0 <1.0 <1.0 <1.0
2nd Qtr -5/31/2012 <1.0 ---<1.0 ____ <1.0 ______ <1.0
3rdQtr 8/30/2012 <1.0 <1.0 <1.0
4th .. Qtr 10/3/2012 <1.0 <1.0 <1.0
1stQtr 217/2013 <1.0 <1.0 <1.0
2ndQtr 5/30/2013 <1.0 <1.0 <1.0
3rdQtr 9/5/2013 <1.0 <1.0 <1.0
4thQtr 11/7/2013 <1.0 <1.0 <1.0
1stQtr 1/29/2014 <1.0 <1.0 <1.0
2nd Qtr 5/22/2014 <1.0 6.9 <1.0
3rd Qtr 8/14/2014 <1.0 47 <1.0
4thQtr 10/29/2014 <1.0 101 <1.0
1st Ctr 3/12/2015 <1.0 53.5 <1.0
2nd Qtr 6/11/2015 <1.0 35.1 <1.0
3rd Qtr 9/3/2015 <1.0 48 <1.0
4th Qtr 10/28/2015 <1.0 68.4 <1.0
1stQtr 3/17/2016 <1.0 74.3 <1.0
2nd Qtr 6/8/2016 <1.0 76.2 <1.0
3rd Qtr 8/3/2016 <1.0 76.8 <1.0
4thQtr 10/26/2016 <1.0 76.0 <1.0
1stQtr 3/17/2017 <1.0 113 <1.0
2nd Qtr 6/21/2017 <1.0 113 <1.0
3rd Qtr 8/3/2017 <1.0 118 <1.0
4th Qtr 10/11/2017 <1.0 132 <1.0
DWMRC_split_samcle <0.98 120 <1.5
1stQtr 3/21/2018 <1.0 159 <1.0
2nd Qtr 6/4/2018 <1.0 134 <1.0
Deplicate TW4-75 <1.0 132 <1.0
3rd Qtr 9/5/2018 <1.0 94.2 <1.0
Deplicate TW4-75 <1.0 92.4 <1.0
4thQtr 12/13/2018 <1.0 109 <1.0
1stQtr 3/19/2019 <1.0 86.4 <1.0
2ndQtr 6/19/2019 <1.0 68.1 <1.0
3rdQtr 9/11/2019 <1.0 66.0 <1.0
4thQtr 12/18/2019 <1.0 54.8 <1.0
1stQtr 3/18/2020 <1.0 48.9 <1.0
2ndQtr 6/12/2020 <1.0 55.1 <1.0
Deplicate TW4-70 <1.0 56.4 <1.0
3rdQtr 9/18/2020 <1.0 45.0 <1.0
4thQtr 11/11/2020 <1.0 47.1 <1.0
OWMRC split sample <10 48.0 <20
OWMRC Oup sample (lW4-81) <10 46.0 <20
1stQtr 3/18/2021 <1.0 39.0 <1.0
Deplicate TW4-70 <1.0 38.2 <1.0
2ndQtr 6/16/2021 <1.0 102 <1.0
3rdQtr 9/22/2021 <1.0 30.0 <1.0
4thQtr 12/8/2021 <1.0 25.4 <1.0
1stQtr 3/23/2022 <1.0 16.5 <1.0
2ndQtr 6/22/2022 <1.0 9.8 <1.0
3rdQtr 9/14/2022 <1.0 10.8 <1.0
Oeclicate TW4-70 <1.0 8.7 <1.0
(1) voes were resampled because laboratory missed holding time
(2) As of March 2012 both north and south wild llfe ponds no IOA9!'" receIvIn.2, water
NA and #N/Af.for Qraphs) = not analyzed
Shaded indicates concentrations exceedinQ GWQS.
J = Approximate value
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<20
<20
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
15 uo/LI
1.6 J
Chloride
No GWQS Imo/LI
NA
NA
NA
42
38
39
41
44
44
42
38
40
35
35
28
58
30
30
30
37
47
33
40
34
41
38
21
38
NA
28 ---------23
22
21
20.6
21 .4
22.7
23.6
22
24
27
25
29.5
35.3
39.3
29.2
33.6
35.1
33.6
37.4
34.5
35.9
37
32
35
38.3
35.7
35.2
43.4
42.7
36.3
36.9
38.3
35.2
40.1
37.7
39.5
39.6
36.7
37.2
38
38
40.7
38.7
37.4
30.8
36.9
34.6
41 .7
32.4 32.4
Nitrate, Nitrate + Nitrite
110 mo/LI
1.3
1.3
1.3
1.3
1.5
1.5
0.9
0.7
0.6
1.3
1.8
2
2.1
2.3
2.79
1.99
2.5
2.3
2.5
1.7
1.4
1.5
1.2
1.8
1.3
3.4
4
2.3
#N/A
2.3 ------------4.0
3.9
3.8
4.49
4.49
4.03
4.87
4.36
3.44
2.7
4.29
3.28
1.83
1.44
2.89
2.51
2.16
2.11 ~
2.18
1.92
1.90
2.18
2.20
1.85
1.85
1.91
1.04
1.11
1.23
1.09
0.785
0.904
0.744
0.855
0.990
1.010
0.867
1.11
0.97
0.97
1.06
1.07
2.0
0.700
0.798
0.80
0.62
0.673
0.660
TABLE 1 (13 of 33)
Historic Summary Of Monitoring Well Analytical Results Up To The 3rd Quarter 2022
Chloroform Contamination Investigation
DUSA White Mesa Mill
TW4-10 Parameter
Sampling Event IGWQSl
Carbon Tetrachloride Chloroform Chloromethane Methylene Chloride
15 ua/L\ 170 uo/L\ 130 un/L\
1stQtr 3116/2005 NA 140 NA NA
2ndQtr 512512005 NA 61 NA NA
3rdQtr 8131/2005 <2.5 110 6.2 <2.5
4thQtr 1217/2005 <2.5 300 <2.5 <2.5
1stQtr 3/912006 <5.0 190 <5.0 <5.0
2nd Qtr 6/14/2006 <5.0 300 <5.0 <5.0
3rd Qtr 7/2012006 <5.0 504 <5.0 <5.0
4thQtr 1118/2006 <1.0 452 1.6 <1.0
1stQtr 2128/2007 <1.0 500 <1.0 <1.0
2nd Qtr 6/2712007 <1.0 350 <1.0 <1.0
3rdQtr 811512007 <1.0 660 <1.0 <1.0
4thQtr 1011012007 <1.0 470 <1.0 <1.0
1stQtr 3/2812008 <1.0 620 <1.0 <1.0
2nd Qtr 612512008 <1.0 720 <1.0 <1.0
3rdQtr 9110/2008 <1.0 660 <1.0 <1.0
4thQtr 10/15/2008 NA #NIA NA NA
11/18/2008 <2.0 1 200 <2.0 <2.0
1st0tr 3/11/2009 <1.0 1,100 <1.0 <1.0
2nd Qtr 6/2312009 <1.0 1,200 <1.0 <1.0
3rdQtr 9/14/2009 <1.0 910 <1.0 <1.0
4thQtr 12/22/2009 <1.0 300 <1.0 <1.0
1stQtr 31312010 <1.0 460 <1.0 <1.0
2nd Qtr 6/14/2010 <1.0 220 <1.0 <1.0
3rd Qtr 8/1212010 <1.0 100 <1.0 <1.0
4thQtr 10/1512010 <1.0 1100 <1.0 <1.0
1stOtr '2/23/2011 <1.0 620 <1.0 <1.0
2nd Qtr 6/14/2011 <1.0 280 <1.0 <1.0
3rdQtr 8/17/2011 <1.0 180 <1.0 <1.0
4thQtr 11/16/2011 <1.0 110 <1.0 <1.0
1st Qtr(1) 111912012 <1.0 76 ~1.0 ------<1.0
2nd Qtr 611412012 <1.0 79 <1.0
3rdQtr 9/1212012 <1.0 130 <1.0
4thQtr 101312012 <1.0 140 <1.0
1stQtr 2/1312013 <1.0 154 <1.0
2nd Qtr 6/1312013 <1.0 486 <1.0
3rd Qtr 9/1212013 <1.0 1,126 <1.0
Qtr 1111412013 <1.0 1 380 <1.0
Qtr 112912014 5.16 1,260 <1.0
Qtr 512312014 <1.0 1,110 <1.0
Qtr 812712014 <1.0 1,060
Otr 10/30/2014 <1.0 1 220 <1.0
stQtr 3/1812015 <1.0 1,210 <1.0
ndQtr 611112015 <1.0 1,240 <1.0
rd Qtr 9/1012015 <1.0 1,280 <1.0
h Qtr 10129/2015 <1.0 1 350 <1.0
stQtr 312212016 <1.0 1,430 <1.0
ndQtr 6/8/2016 <1.0 ----12_10 <1.0
rd Qtr 8/4/2016 <1.0 1,500 <1.0
Qtr 10/2612016 <1.0 1290 <1.0
Qtr 3/2112017 <1.0 1,260 <1.0
;Qtr 612112017 <1.0 1,140 <1.0
Qtr 81412017 <1.0 1,320 <1.0
Qtr 1011112017 <1.0 1,150 <1.0 ,., <9.5 1100 <15
stQtr 3/2112018 <1.0 1,240 <1.0
ndQtr 6/1412018 <1.0 914 <1.0
rd Qtr 91612018 <1.0 911 <1.0
hQtr 12/1312018 <1.0 1 070 <1.0
1stQtr 3/2012019 <1.0 869 <1.0
2nd Qtr 6119/2019 <1.0 799 <1.0
3rd Qtr 911212019 <1.0 734 <1.0
4thQtr 12/1812019 <1.0 768 <1.0
stQtr 3/1812020 <1.0 798 <1.0
nd Qtr 6/1112020 <1.0 928 <1.0
rd Qtr 9/1912020 <1.0 854 <1.0
h Qtr 11/1112020 <1.0 903 <1.0
stQtr 3/1812021 <1.0 718 <1.0
ndQtr 6/1712021 <1.0 609 <1.0
rd Qtr 9/2312021 <1.0 545 <1.0
h Qtr 12/912021 <1.0 675 <1.0 :~,~~:. 312412022 <1.0 471
TW4-75 <1.0 456
'ndQtr 612212022 <1.0 342 <1.0
rd Qtr 9/1512022 <1.0 563 <1.0
(1) As of March 2012 both north and south wild 11tepoods no longer receIvU!2_ water
NA and #N/A(for graphs)= not analyzed
Shaded indicates concentrations exceeding GWQS.
J = Approximate value
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
1.5 <1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1 . .0
1 <1.0
1 <1.0
<1.0
<1.0
(5 ua/Ll
16 J
Chloride
No GWQS Cma/Ll
NA
NA
NA
52
50
54
61
58
2
54
59
59
55
58
51
61
NA
64
62
51
51
48
42
38
52
32
42
41
45
40 ------46
44
45
49.1
51.5
67.9
70.9
73
77.3
74
75.2
78,6
75
89.5
79.9
84,1
89.5
85.3
84.4
74.6
73.1
77
70
76
72.7
64.5
75.5
63.5
59.3
58.7
55.8
62
53.5
60.1
53.9
58.6
58.1
48.7
50.6
51.9
46.0
44.8
46.0
52.0
Nitrate, Nitrate + Nitrite
110ma/Ll
1.6
0.8
1.1
3.3
2.4
3.5
6.8
5.7
7.3
5.1
7.3
6.7
7.3
9.9
9.23
10.5
#NIA
11 .6
9.8
8.1
3.8
5.0
1.6
0.8
11 .0
9.0
3.3
1.9
1.1
-----------· ~~ 0.8
1.0
1.6
1.2
5.6
13.0
16.0
16.8
13.9
9.8
13.2
15.0
11.4
14.0
13.5
17.3
14,9
14.9
14.8
13.0
13.0
13.4
12.9
13.0
11 .1
11 .2
10.1
10.6
9.34
8.86
7.79
6.89
7.83
8.13
7.34
8.69
7.20
7.75
6.35
5.47
5.1
4.9
4.6
5.57
TABLE 1 (14 of 33)
Historic Summary Of Monitoring Well Analytical Results Up To The 3rd Quarter 2022
Chloroform Contamination Investigation
OUSA White Mesa Mill
TW4-11 (chlorofoml pt.Imping well
started1114/15) Parameter
Sampling Event IGWQS\
Carbon Tetrachloride Chloroform Chloromethane Methylene Chloride
15 ua/Ll 170 ua/Ll 130 un/L\ 15 ua/Ll
1stQtr 3/16/2005 NA 4,400 NA NA
2ndQtr 5/25/2005 NA 3,590 NA NA
3rdQtr 8/31/2005 <10 4,400 <10 <10
4thQtr 12/7/2005 <100 4,400 <100 <100
1stQtr 3/9/2006 <50 4,400 <50 <50
2ndQtr 6/14/2006 <50 4,300 <50 <50
3rdQtr 7/20/2006 <50 4,080 <50 <50
4thQtr 11/8/2006 1.7 3 660 2.7 1.3
1stQtr 2/28/2007 1.3 3,600 <1.0 1.6
2ndQtr 6/27/2007 1.6 3,800 <1.0 <1.0
3rdQtr 8/15/2007 1.7 4,500 <1.0 <1.0
4th Qtr 10/10/2007 1.6 4 400 <1.0 1.2
1stQtr 3/28/2008 <1.0 340 <1.0 <1.0
2nd Otr 6/25/2008 <1.0 640 <1.0 <1.0
3rdQtr 9/10/2008 <1.0 900 <1.0 <1.0
4th Qtr 10/15/2008 NA #NIA NA NA
11/18/2008 <2.0 1 000 <2.0 <2.0
1stQtr 3/11/2009 <1.0 1,000 <1.0 <1.0
2nd Qtr 6/23/2009 <1.0 980 <1.0 <1.0
3rdQtr 9/14/2009 <1.0 1,000 <1.0 <1.0
4th Qtr 12/22/2009 <1.0 860 <1.0 <1.0
1stQtr 3/3/2010 <1.0 820 <1.0 <1.0
2nd Qtr 6/14/2010 <1.0 820 <1.0 <1.0
3rdQtr 8/12/2010 <1.0 800 <1.0 <1.0
4th Qtr 10/1512010 <1.0 720 <1.0 <1.0
1stQtr 212312011 <1.0 1,000 <1.0 <1.0
2nd Qtr 611/2011 <1.0 930 <1.0 <1.0
3rdQtr 8117/2011 <1.0 820 <1.0 <1.0
4thQtr 11116/2011 <1.0 1500 <1.0 <1.0
1st Qtr (1) 112412012 <1.0 610 <1.0 <1.0
2nd Qtr 611312012 <1.0 ------660 <1.0 ______ <1.0 ------
3rdQtr 9/1312012 <1.0 740 <1.0 <1.0
4th Qtr 101312012 <1.0 730 <1.0 <1.0
1stQtr 211312013 3.23 867 <1.0 <1.0
2ndQtr 6/1812013 <1.0 788 <1.0 <1.0
3rdQtr 911212013 <1.0 865 <1.0 <1.0
4thQtr 1111312013 <1.0 874 <1.0 <1.0
1st0tr 21512014 5.19 785 <1,0 <1.0
2ndQtr 512312014 <1.0 751 <1.0 <1.0
3rdQtr 812712014 <1.0 719 1.2 <1.0
4th Qtr 10129/2014 <1.0 ~----§.0] <1.0 <1.0
1st Qtr(2) 31912015 1.24 2,450
<1.0 ______ <1.0 --------
2nd Qtr 611112015 <1.0 2,710 <1.0 <1.0
3rdQtr 8/3112015 <1.0 1,120 <1.0 <1.0
4th Qtr 10/29/2015 <1.0 2 730 <1.0 <1.0
1stQtr 31912016 1.2 2,660 <1.0 <1.0
2nd Qtr 512312016 2.19 l240 <1.0 <1.0
3rdQtr 712512016 <1.0 _____uQO <1.0 <1.0
4th Qtr 1011212016 <1.0 3 200 <1.0 <1.0
1stQtr 31812017 1.71 3,310 <1.0 <1.0
2nd Qtr 6/1312017 1.83 3,370 <1.0 <1.0
3rd Qtr 712612017 1.81 3,290 <1.0 <1.0
4thQtr 10/1112017 1.48 2,880 <1.0 <1.0
DWMRC split samole <38 2 900 <60 140 J
1stQtr 311212018 1.82 3,090 <1.0 <1.0
2nd Qtr 61812018 1.34 2,800 <1.0 <1.0
3rd Qtr 812212018 1.47 3,050 <1.0 <1.0
4thQtr 1112812018 1.33 2 930 <1.0 <1.0
1stQtr 31812019 1.48 2,820 <1.0 <1.0
2nd Qtr 61512019 1.52 2,970 1.4 <1.0
3rd Qtr 91412019 1.47 2,790 <1.0 <1.0
4thQtr 1211812019 <1.0 3 250 <1.0 <1.0
1stQtr 211912020 <1.0 2,990 <1.0 <1.0
2nd Qtr 511112020 1.37 2,810 <1.0 <1.0
3rd Qtr 91412020 1.47 3,070 <1.0 <1.0
4thQtr 10/2812020 <1.0 2 670 3.86 <1.0
1stQtr 2123/2021 <1.0 2,750 <1.0 <1.0
2nd Qtr 61912021 <1.0 3,320 <1.0 <1.0
3rdQtr 812412021 <1.0 2,600 <1.0 <1.0
4th Qtr 121112021 <1.0 2 850 <1.0 <1.0
1stQtr 31912022 <1.0 2,780 <1.0 <1.0
2nd Qtr 6/812022 1.0 2,550 2.7 <1.0
3rdQtr 911512022 <1.0 3 020 <1.0 <1.0
(1) As of March 2012 both north and south wild llfeponds no longer receiving water
(2) Chloroform pump1!!S welt 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
Chloride
No GWQS lma/L\
NA
NA
NA
58
56
56
55
55
54
53
53
53
63
46 4i
47
NA
49
44
49
46
42
40
43
49
46
49
48
46
43 ------52
49
50
47.3
49.3
46.6
46.7
48.5
51 .6
48
56.4
49.8
62.2
73.1
55.3
55.5
56.4
55.3
57.2
49.8
51.4
51
49.7
52
54
52.4
53.3
45.4
46.8
45.3
48.8
49.0
51.9
48.6
46.3
43.3
49.5
37.7
40.2
48.4
41.5
44.5
42.4
Nitrate, Nitrate + Nitrite
110 mo/L\
8.7
10.3
9.4
9.4
9.2
10.0 ,a.a
10.0
10.1
10.6
10.2
9.8
7.7
7.3
7.9
9.5
#N/A
7.3
6.8
7.0
6.6
6.8
6.9
6.7
6.4
6.5
7.3
7.1
7.1
6.8
6.7
3.0
7.0
6.8
7.4
7.8
8.01
8.47
6.92
5.4
7.33
8.72
8.48
9.61
7.5
7.13
7.81
8.83
8.92
8.12
7.92
7.78
7.79
8.0
7.89
7.51
7.15
6.85
7.50
8.30
7.15
7.14
7.07
7.56
7.59
7.19
7.21
8.17
5.78
7.44
7.4
5.9
6.90
TABLE 1 (15 of 33)
Historic Summary Of Monitoring Well Analytical Results Up To The 3rd Quarter 2022
Chloroform Contamination Investigation
DUSA White Mesa Mill
TW4-12 Parameter
Sampling Event IGWQSl
Carbon Tetrachloride Chloroform Chloromethane . Methylene Chloride
15 uolLI 170 un/L\ 130 un/L\ 15 ua/LI
1stQtr 3/16/2005 NA <1.0 NA NA
2nd Qtr 5/2512005 NA <1.0 NA NA
3rd Qtr 8/3112005 <1.0 <1.0 5.8 <1.0
4thQtr 12/712005 <1.0 <1.0 1.0 <1.0
1stQtr 3/912006 <1.0 <1.0 2.6 <1.0
2nd Qtr 6/1412006 <1.0 <1.0 1.4 <1 .0
3rdQtr 7/2012006 <1.0 <1.0 1.4 <1.0
4thQtr 1118/2006 <1.0 <1.0 <1.0 <1.0
1stQtr 2/2812007 <1.0 <1.0 <1.0 <1.0
2nd Qtr 6/27/2007 <1.0 <1.0 <1.0 <1.0
3rdQtr 8115/2007 <1.0 <1.0 <1.0 <1.0
4thQtr 10110/2007 <1.0 <1.0 <1.0 <1.0
1stQtr 3/28/2008 <1.0 <1.0 <1.0 <1.0
2ndQtr 6125/2008 <1.0 <1.0 <1.0 <1.0
3rdQtr 9/10/2008 <1.0 <1.0 <1.0 <1.0
4th_Qtr .... 10/15/2008 <1.0 <1.0 <1.0 . <1.0
1stQtr 3111/2009 <1.0 <1.0 <1.0 <1.0
2ndQtr 6/2312009 <1.0 <1.0 <1.0 <1.0
3rdQtr 9/1412009 <1.0 <1.0 <1.0 <1.0
4thQtr 12116/2009 <1.0 <1.0 <1.0 <1.0
1stQtr 2123/2010 <1.0 <1.0 <1.0 <1.0
2nd Qtr 6114/2010 <1.0 <1.0 <1.0 <1.0
3rdQtr 8110/2010 <1.0 <1.0 <1.0 <1.0
4thQtr 10/15/2010 <1.0 <1.0 <1.0 <1.0
1stQtr 2115/2011 <1.0 <1.0 <1.0 <1.0
2ndQtr 5125/2011 <1.0 <1.0 <1.0 <1.0
3rdQtr 8116/2011 <1.0 <1.0 <1.0 <1.0
4thQtr 11115/2011 <1.0 <1.0 <1.0 <1.0
1st Qtr(1) __ 111712012 <1.0 <1.0 <1.0 <1.0 -----------.,._ ______ <1.0 ______ <1.0 ------2nd Qtr 5131/2012 <1.0 <1.0
3rdQtr 8/2912012 <1.0 <1.0 <1.0 <1.0
4thQtr 10/3/2012 <1.0 <1.0 <1.0 <1.0
1stQtr 2113/2013 <1.0 <1.0 <1.0 <1.0
2nd Qtr 512912013 <1.0 <1.0 <1.0 <1.0
3rdQtr 8/2912013 <1.0 <1.0 <1.0 <1.0
4thQtr i116/2013 <1.0 <1.0 <1.0 <1.0
1stQtr 1122/2014 <1.0 <1.0 <1.0 <1.0
2nd Qtr 512112014 <1.0 <1.0 <1.0 <1.0
3rdQtr 8/2712014 <1.0 <1.0 <1.0 <1.0
4thQtr 10/2312014 <1.0 <1.0 <1.0 <1.0
1stQtr 3/1112015 <1.0 <1.0 <1.0· <1.0
2nd Qtr 6/1012015 <1.0 <1.0 <1.0 <1.0
3rdQtr 91212015 <1.0 <1.0 <1.0 <1.0
4thQtr 10/2112015 <1.0 <1.0 <1.0 <1.0
De licate TW4--65 <1.0 <1.0 <1.0 <1.0
i"stQtr :,11512016 <1.0 <1.0 <1.0 <1.0
2ndQtr 5/25/2016 <1.0 <1.0 <1.0 <1.0
OeplieateTW4..f 5/25/2016 <1.0 <1.0 <1.0 <1.0
3rdQtr 7/27/2016 <1.0 <1.0 <1.0 <1.0
4thQtr 10112/2016 <1.0 <1.0 <1 .0 <1.0
1stQtr 3/14/2017 <1.0 <1.0 <1 .0 <1.0
2nd Qtr 6114/2017 <1.0 1.25 <1.0 <1.0
3rdQtr 8/2/2017 <1.0 1.2 <1.0 <1.0
Deplicate TW4-70 <1.0 1.19 <1.0 <1.0
4thQtr 1011012017 <1.0 <1.0 <1.0 <1.0
n .. nti,-:,t<> TW4-70 <1.0 <1.0 <1.0 <1.0
1stQtr 3/14/2018 <1.0 <1.0 <1.0 <1.0
2nd Qtr 6/1212018 <1.0 <1.0 <1.0 <1.0
3rdQtr 812912018 <1.0 <1.0 <1.0 <1.0
4th0tr 11/3012018 <1.0 <1.0 <1 .0 <1.0
1stQtr 3/16/2019 <1.0 <1.0 <1 .0 <1.0
2nd Qtr 611312019 <1.0 <1.0 <1.0 <1.0
rdQtr 9/1112019 <1.0 <1.0 <1.0 <1.0
hQtr 12/1412019 <1.0 <1.0 <1 .0 <1.0
stQtr 3/1712020 <1.0 <1.0 <1.0 <1.0
nd Qtr 6/1112020 <1.0 <1.0 <1.0 <1.0
rd Qtr 9/1712020 <1.0 <1.0 <1.0 <1.0
4th Qtr 1114/2020 <1.0 <1.0 <1.0 "<1.0
1stQtr 3/1712021 <1.0 <1.0 <1.0 <1.0
2nd Qtr 6/1512021 <1.0 <1.0 <1.0 <1.0
3rd Qtr 9/1512021 <1.0 <1.0 <1.0 <1.0
4th0tr 121712021 <1.0 <1.0 <1.0 <1.0
1stQtr 3/15/2022 <1.0 <1.0 <1.0 <1.0
2ndQtr 6/1512022 <1.0 <1.0 <1.0 <1.0
3rdQtr 9113/2022 <1.0 <1.0 <1.0 <1.0
J1) As of March 2012 both north and south wild hl~;mds no longer rece1vm.2, water
NA= not analyzed
Shaded indicates concentrations exceeding GWQS.
Chloride
No GWQS Ima/LI
NA
NA
NA
19
19
16
16
16
16
18
29
16
16
19
18
22
23
22
22
23
22
29
35
31
31
32
31
30
28 ---------34
39
39
36.7
38.6
41.7
41.4
41.6
40.2
47
50.2
50.6
56
60.2
51
51.3
56.2
66.4
67
67.5
72.6
62.6
67.2
65.3
67
56.2
61.4
59.5
53.6
59.9
56.1
50.8
55.3
52.6
58.0
53.0
51.7
50.3
48.0
52.0
51.8
36.1
49.8
25.8
53.3
57.9
Nitrate, Nitrate + Nitrite
110 ma/LI
1.4
1.6
1.5
1.4
1.3
1.4
1.4
1.4
1.5
1.5
1.4
1.4
1.6
2.7
2.7
2.5
2.4
3.8
5.1
3.6
4.0
11.0
9.0
8.0
6.5
7.0
6.8
8.0
7.7
10.0
13.0
13.0
12.6
14.2
17.4
16.4
18.4
17.0
13.0
16.1
19.2
18.8
16.4
18.0
18.0
34.8
30.7
113.0
37.7
25.8
25.9
29.9
25.1
26.7
26.9
26.8
19.8
18.4
13.6
10.4
10.1
8.31
8.88
8.04
6.39
4.95
2.34
5.91
3.10
2.39
1.95
1.46
8.4
16.0
13.8
TABLE 1 (16 of 33)
Historic Summary Of Monitoring Well Analytical Results Up To The 3rd Quarter 2022
Chloroform Contamination Investigation
DUSA White Mesa Mill
TW4-13 Parameter
Sampling Event IGWQSl
Carbon Tetrachloride Chloroform Chloromethane Methylene Chloride
15 ua/Ll 170 un/L\ /JO un/L\ 15 uo/Ll
1stQtr 3/16/2005 NA <1.0 NA NA
2nd Qtr 5/25/2005 NA <1.0 NA NA
3rd Qtr 8/31/2005 <1.0 <1.0 3.1 <1.0
4thQtr 1217/2005 <1.0 <1.0 <1.0 <1.0
1stQtr 3/9/2006 <1.0 <1.0 1.7 <1.0
2nd0tr 6/14/2006 <1.0 <1.0 1.4 <1.0
3rd Qtr 7/20/2006 <1.0 <1.0 <1.0 <1.0
4lhQlr 11/8/2006 <1.0 <1.0 <1.0 <1.0
1s1Qtr 2128/2007 <1.0 <1.0 <1.0 <1.0
2ndQtr 6/27/2007 <1.0 <1.0 <1.0 <1.0
3rdQtr 8/15/2007 <1.0 <1.0 <1.0 <1.0
1.thQtr 10/10/2007 <1.0 <1.0 <1.0 <1.0
1st0tr 3/28/2008 <1.0 <1.0 <1.0 <1.0
2nd Qtr 6/25/2008 <1.0 <1.0 <1.0 <1.0
3rdQtr 9/10/2008 <1.0 <1.0 <1.0 <1.0
4thQlr 10/15/2008 <1.0 <1.0 <1.0 <1.0
1s1Qtr 3/4/2009 <1.0 <1.0 ·;;1_0 <1.0
2ndQtr 6/23/2009 <1.0 <1.0 <1 .0 <1.0
3rd0tr 9/14/2009 <1.0 <1.0 <1.0 <1.0
4lhQlr 12/16/2009 <1.0 <1.0 <1.0 <1.0
1s1Qtr 2/24/2010 <1.0 <1.0 <1.0 <1.0
2ndQtr 6/1412010 <1.0 <1.0 <1 .0 <1.0
3rd Qtr 8/10/2010 <1.0 <1.0 <1 .0 <1.0
4thQtr 10/15/2010 <1.0 <1.0 <1.0 <1.0
·i"stQtr 2/15/2011 <1.0 <1.0 <1.0 <1.0
2nd0tr 5/25/2011 <1.0 <1.0 <1.0 <1.0
3rdQtr 8/1612011 <1.0 <1.0 <1.0 <1.0
4thQlr 11/15/2011 <1.0 <1.0 <1 .0 <1.0
1st citr (1) 1/17/2012 <1.0 <1.0 <1.0 <1.0
2nd Qtr 5/31/2012 <1.0 --<1.0 ____ <1.0 ______ <1.0
3rdQtr 8/2912012 <1.0 <1.0 <1.0 <1.0
4th0tr 10/3/2012 <1.0 <1.0 <1 .0 <1.0
1stQtr 2/13/2013 <1.0 <1.0 <1.0 <1.0
2nd Qtr 5/29/2013 <1.0 <1.0 <1 .0 <1.0
3rdQtr 8/29/2013 <1.0 <1.0 <1.0 <1.0
4thQtr 11/6/2013 <1.0 <1.0 <1.0 <1.0
1stQtr 1/22/2014 <1.0 <1.0 <1.0 <1.0
2nd Qtr 5/21/2014 <1.0 <1.0 <1 .0 <1.0
3rd Qtr 8/23/2014 <1.0 <1.0 <1.0 <1.0
4th Qtr 10/23/2014 <1.0 <1.0 <1.0 <1.0
1stQtr 3/11/2015 <1.0 <1.0 <1.0 <1.0
2nd Qtr 6/10/2015 <1.0 <1.0 <1.0 <1.0
3rd Qtr 9/2/2015 <1.0 <1.0 <1.0 <1.0
4th Qtr 10/21/2015 <1.0 <1.0 <1 .0 <1.0
1st Ctr 3/16/2016 <1.0 <1.0 <1.0 <1.0
2nd Qtr 5/25/2016 <1.0 <1.0 <1.0 <1.0
3rd Qtr 7/28/2016 <1.0 <1.0 <1.0 <1.0
4th0tr 10/19/2016 <1.0 <1.0 <1.0 <1.0
1s!Qtr 3/16/2017 <1.0 <1.0 <1.0 <1.0
2nd Qtr 6115i2017 <1.0 <1.0 <1.0 <1.0
3rd Qtr 8/2/2017 <1.0 <1.0 <1.0 <1.0 '
4thQtr 10/10/2017 <1.0 <1.0 <1.0 <1.0
1stQtr 3/14/2018 <1.0 <1.0 <1.0 <1.0
2nd Qtr 6/12/2018 <1.0 <1.0 <1.0 <1.0
3rdQtr 8129/2018 <1.0 <1.0 <1.0 <1.0
4thQtr 11130/2018 <1.0 <1.0 <1.0 <1.0
1stQtr 3/16/2019 <1.0 <1.0 <1.0 <1.0
2nd Qtr 6/13/2019 <1.0 <1.0 · <1.0 <1.0
3rd Qtr 9/11/2019 <1.0 <1.0 <1.0 <1.0
4th Qtr 12114/2019 <1.0 <1.0 <1.0 <1.0
1stQtr 3117/2020 <1.0 <1.0 <1.0 <1.0
2nd Otr 6/11/2020 <1.0 <1.0 <1.0 <1.0
3rdQtr 9/17/2020 <1.0 <1.0 <1.0 <1.0
4thQtr 11/4/2020 <1.0 <1.0 <1.0 <1.0
1stQtr 3/17/2021 <1.0 <1.0 <1.0 <1.0
2nd Qtr 6/15/2021 <1.0 <1.0 <1.0 <1.0
3rdQtr 9/15/2021 <1.0 <1.0 <1 .0 <1.0
4thQtr 12/712021 <1.0 <1.0 <1 .0 <1.0
1stQtr 31i"iii2022 <1.0 <1.0 <1 .0 <1.0
2nd Qtr 6/15/2022 <1.0 <1.0 <1 .0 <1.0
3rdQtr 9/13/2022 <1.0 <1.0 <1.0 <1.0
('!l As of March 2012 both north and south wild life P5TdS no IO;l9;" receIvIn..2, water
NA= not analyzed
Shaded indicates concentrations exceedm!l GWQS.
Chloride
No GWQS Ima/LI
NA
NA
NA
69
67
66
65
33
59
59
58
58
54
58
50
58
58
57
63
60
53
53
55
55
60
56
60
54
55 ---------59
60
60
59.3
56
63.5
58.5
63.1
56.1
62
66.1
66.4
70.3
76.5
65.5
69.4
71.8
69.3
70.9
66.0
70.4
70.5
60.9
71.0
65.0
73.7
64.5
61.6
65.4
65.3
68.7
63.9
62.7
60.2
60.6
67.3
57.7
54.2
61.0
59.2
62.6
62.4
Nitrate, Nitrate + Nitrite
110 ma/Ll
4.2
4.3
4.6
4.3
4.2
4.9
4.3
0.8
4.0
4.6
4.4
4.1
3.8
4.2
4.3
4.6
3.7
1.2
4.7
4.1
4.3
5.2
5.6
5.8
5.5
6.4
5.2
5.9
5.5
6.0
6.2
5.9
6.31
6.8
7.16
6.48
7.09
5.99
4.8
6.28
7.09
6.32
5.7
5.78
7.97
5.87
6.14
6.20
6.05
6.49
6.15
6.17
5.76
6.24
5.13
5.29
5.74
6.56
5.19
5.17
5.5
9.0
5.25
4.92
5.57
2.9
4.80
5.06
4.80
4.5
4.37
TW4-14
Sampling Event
1stQtr 3/1612005
2nd Qtr 5/2512005
3rdQtr 8/31/2005
4thQtr 121712005
1stQtr 31912006
2nd Qtr 6/14/2006
3rdQtr 7/2012006
4thQtr 11/812006
1st Ctr 2128/2007
2nd Qtr 6127/2007
3rdQtr 8/1512007
4thQtr 10/10/2007
1stQtr 3/2812008
2nd Qtr 6/2512008
3rdQtr 9110/2008
4thQtr 10/1512008
1statr 31412009
2nd Qtr 612312009
3rdQtr 9114/2009
4thQtr 1211612009
1stQtr 3/2312010
2nd Qtr 6114/2010
3rd Qtr 8110/2010
4thQtr 10/15/2010
1stQtr 2115/2011
2nd Qtr 612412011
3rd Qtr 8/1612011
4thQtr 1111512011
1st Qtr (1) 111712012
2nd Qtr 611412012
3rd Qtr 8/2912012
4thQtr 10/312012
1stQtr 21712013
2nd Qtr 51291201 3
3rdQtr 812912013
4thQtr 1116/2013
1stQtr 1/2212014
2ndQtr 5/2112014
3rdQtr 8/1312014
4thQtr 10/23/2014
1stQtr 3/1212015
2ndQtr 6/1012015
3rdQtr 91312015
4thQtr 10/23/2015
1stQtr 3/1612016
2ndQtr 5126/2016
3rdQtr 8/312016
4thQtr 1012012016
1stQtr 311512017
2nd Qtr 6/1512017
3rdQtr 81212017
4thQtr 1011012017
1statr 3/1512018
2nd Qtr 6/1312018
3rdQtr 813012018
4thQtr 1211212018
1stQtr 3/1612019
2nd Qtr 6113/2019
3rdQtr 9/1112019
4thQtr 1211412019
1stQtr 3/1712020
2ndQtr 6/1112020
3rdQtr 9/1812020
4thQtr 11/412020
1stQtr 3/1812021
2ndQtr 6/1612021
3rdQtr 9/1512021
4thQtr 1218/2021
1stQtr 3/1612022
2ndQtr 611612022
3rdQtr 9/1412022
TABLE 1 (17 of 33)
Historic Summary Of Monitoring Well Analytical Results Up To The 3rd Quarter 2022
Chloroform Contamination Investigation
DUSA White Mesa Mill
Parameter
IGWQSI
Carbon Tetrachloride Chloroform Chloromethane Methylene Chloride Chloride
15 ua/Ll 170 un/L\ /JO un/L\ 15 ua/Ll No GWQS Ima/LI
NS NS NS NS NS
NS NS NS NS NS
NS NS NS NS NS
NS NS NS NS NS
NS NS NS NS NS
NS NS NS NS NS
NS NS NS NS NS
<1 .0 NS <1.0 <1.0 37
<1.0 <1.0 <1.0 <1.0 38
<1.0 <1.0 <1.0 <1.0 38
<1.0 <1.0 <1.0 <1.0 36
<1.0 <1.0 <1.0 <1.0 38
<1.0 <1.0 <1.0 <1.0 57
<1.0 <1.0 <1.0 <1.0 35
<1.0 <1.0 <1.0 <1.0 34
<1.0 <1.0 <1.0 <1.0 40
<1.0 <1.0 <1.0 <1.0 35
<1.0 <1.0 <1.0 <1.0 36
<1.0 <1.0 <1.0 <1.0 38
<1.0 <1.0 <1.0 <1.0 34
<1.0 <1.0 <1.0 <1.0 33
<1.0 <1.0 <1.0 <1.0 49
<1.0 <1.0 <1.0 <1.0 35
<1.0 <1.0 <1.0 <1.0 29
<1.0 <1.0 <1.0 <1.0 25
<1.0 <1.0 <1.0 <1.0 24
<1.0 <1.0 <1.0 <1.0 33
<1.0 <1.0 <1.0 <1.0 15
<1.0 <1.0 <1.0 <1.0 20
<1.0 <f O ____ <1.0 ______
<1.0 ---------35
<1.0 <1.0 <1.0 <1.0 37
<1.0 <1.0 <1.0 <1,0 37
<1.0 <1.0 <1.0 <1.0 35.2
<1.0 <1.0 <1.0 <1.0 38.6
<1 .0 <1.0 <1.0 <1.0 37.6
<1.0 <1.0 <1.0 <1.0 36.5
<1 .0 <1.0 <1.0 <1.0 35.5
<1.0 <1 .0 <1.0 <1.0 32.5
<1.0 <1.0 <1.0 <1.0 38
<1.0 <1.0 <1.0 <1.0 38.9
<1.0 1.7 <1.0 <1.0 40.1
<1.0 1.82 <1.0 <1.0 41 .8
<1.0 <1.0 <1.0 <1.0 42.4
<1.0 1.46 <1.0 <1.0 40.6
<1.0 4.49 <1.0 2.18 42.4
<1.0 6.15 <1.0 3.18 43.6
<1.0 5 <1.0 1.8 42.4
<1.0 7.02 <1.0 1.59 45.6
<1.0 6.45 <1.0 2.18 45.4
<1.0 6.85 <1.0 <1.0 46.9
<1.0 6.14 <1.0 <1.0 46.4
<1.0 6.13 <1.0 <1.0 42.5
<1.0 5.8 <1.0 2.18 51.5
<1.0 5.12 <1.0 <1.0 46.9
<1.0 4.76 <1.0 <1.0 54.1
<1.0 4.41 <1.0 <1.0 48.7
<1.0 4.08 <1.0 <1.0 48.7
<1.0 4.18 <1.0 <1.0 48.3
<1.0 6.08 <1.0 <1 .0 45.4
<1 .0 3.83 <1.0 <1.0 49.4
<1.0 2.98 <1.0 <1.0 48.4
<1.0 2.87 <1.0 <1.0 47.6
<1.0 2.41 <1.0 <1.0 45.1
<1.0 2.69 <1.0 <1.0 49.7
<1.0 1.77 <1.0 <1.0 48.2
<1.0 <1.0 <1.0 <1.0 49.5
<1.0 <1.0 <1.0 <1.0 34.1
<1.0 <1.0 <1.0 <1.0 49.0
<1.0 <1.0 <1.0 <1.0 42.0
<1.0 1.0 <1.0 <1.0 48.4
<1.0 1.1 <1.0 <1.0 42.2
(1) As of March 2012 both north and south wild l1f~5mds no longer receIvin.i!. water
NS = not sampled
Shaded indicates concentrations exceeding GWQS.
Nitrate, Nitrate + Nitrite
110 ma/Ll
NS
NS
NS
NS
NS
NS
NS
2.4
2.3
1.4
1.1
0.8
0.4
1.6
1.38
0.76
1.6
1.4
1.5
1.4
2.5
2.9
2.8
2.9
1.8
1.4
2.6
1.7
1.9
3.3
3.9
3.9
4.6
4.4
4.51
4.81
5.92
4.87
4.1
5.22
5.22
3.55
2.77
2.45
2.94
2.45
2.88
2.86
4.36
5.12
4.84
4.73
5.67
6.36
5.34
5.85
6.16
5.86
4.77
4.76
6.17
6.57
5.57
5.81
5.56
7.02
5.56
5.70
5.9
5.30
4.78
TABLE 1 (18 of 33)
Historic Summary Of Monitoring Well Analytical Results Up To The 3rd Quarter 2022
Chloroform Contamination Investigation ·
DUSA White Mesa Mill
TW4-16 Parameter
Sampling Event IGWQSl
Carbon Tetrachloride Chloroform Chloromethane Methylene Chloride Chloride Nitrate, Nitrate + Nitrite
15 uo/Ll 170 ua/Ll 130 uo/Ll 15 ua/Ll No GWQS lma/Ll 110 ma/Ll
1st0tr 3/16/2005 NA 240 NA
2nd Qtr 5/25/2005 NA 212 NA
3rdQtr 8/31/2005 <1.0 85 3.2
4th Ctr 1217/2005 <1.0 14 2.6
1stQtr 3/9/2006 <1.0 39 1.1
2nd Qtr 6/14/2006 <1.0 13 2.4
3rdQtr 7/20/2006 <1.0 5.2 <1.0
4thQtr 11/8/2006 <1.0 13.6 <1.0
1stQtr 2/28/2007 <1.0 8.7 <1.0
2nd Qtr 6/27/2007 <1.0 2.6 <1.0
3rdQtr 8/15/2007 <1.0 7.1 <1.0
4thQtr 10/10/2007 <1.0 1.4 <1.0
1stQtr 3/28/2008 <1.0 11 <1.0
2ndQtr 6/25/2008 <1.0 <1.0 <1.0
3rdQtr 9/10/2008 <1.0 10 <1.0
4thQtr 10/15/2008 <1.0 3.9 <1.0
1stQtr 3/4/2009 <1.0 <1.0 <1.0
2nd Qtr 6/23/2009 <1.0 <1.0 <1.0
3rd Qtr 9/14/2009 <1.0 <1.0 <1.0
4th Qtr 12/17/2009 <1.0 <1.0 <1.0
1stQtr 3/24/2010 <1.0 <1.0 <1.0
2nd Qtr 6/14/2010 <1.0 2.1 <1.0
3rd Qtr 8/24/2010 <1.0 4.3 <1.0
4th Qtr 10/15/2010 <1.0 3 <1.0
1st Ctr 2/22/2011 <1.0 15 <1.0
2nd Qtr 5/26/2011 <1.0 16 <1.0
3rd Qtr 8/17/2011 <1.0 9.2 <1.0
4th Qtr 11/16/2011 NA NA NA
1stOtrH/ ~~~~~~~~ <1.0 <1.0 <1.0
<1.0 <1.0 <1.0
2nd Qtr -5/26/2012 <1.0 -----c:1.0 ____ <1.0 ______
3rdQtr 8/30/2012 <1.0 <1.0
4thQtr 10/3/2012 <1.0 <1.0
1stQtr 217/2013 <1.0 <1.0
2nd Qtr 5/30/2013 <1.0 <1.0
3rd Qtr 9/5/2013 <1.0 <1.0
4th Qtr 11/7/2013 <1.0
1stQtr 1/29/2014 <1.0
2nd Qtr 5/22/2014 <1.0
3rdQtr(2) 8/14/2014 <1.0
3rd Qtr 9/24/2014 <1.0
4thQtr 10/29/2014 <1.0
1stQtr 3/12/2015 <1.0
2ndQtr 6/11/2015 <1.0
3rdQtr 9/3/2015 <1.0
4thQtr 10/28/2015 <1.0
1stOtr 3/17/2016 <1.0
2ndQtr 5/26/2016 <1.0
3rd Qtr 813/2016 <1.0
4thQtr 10/26/2016 <1.0
1stQtr 3/16/2017 <1.0
2nd Qtr 6/20/2017 <1.0
3rd Qtr 8/3/2017 <1.0
4th Qtr 10/11/2017 <1.0
DWMRC solit sam le <0.95
1stQtr 3/20/2018 <1.0
Duplicate TW4-75 <1.0
2nd Qtr 6/14/2018 <1.0
3rd Qtr 8/30/2018 <1.0
4th Ctr 1211212018 <1.0
1stQtr 3/19/2019 <1.0
2nd Qtr 6/19/2019 <1.0
3rd Qtr 9/12/2019 <1.0
4thQtr 12/14/2019 <1.0
Du licate TW4-75 <1.0
·,·stQtr 3/18/2020 <1.0
2nd Qtr 6/12/2020 <1.0
3rd Qtr 9/19/2020 <1.0
4thQtr 11/11/2020 <1.0
Duplicate TW4-75 <1.0
DWMRC sollt same le <10
1stQtr 3/24/2021 <1.0
2nd Qtr 6/17/2021 <1.0
3rd Qtr 9/23/2021 <1.0
4th Qtr 1218/2021 <1.0
1stQtr 3/23/2022 <1.0
2nd Qtr 6/2212022 <1.0
3rdQtr 9/15/2022 <1.0
(1) voes were resampled because laboratory missed holding time.
(2) voes were resampled
<1.0
<1.0
<1.0
<1.0
<1.0
13.4 <1.0
6.93 <1.0
14.6 <1.0
229 <1.0
371 <1.0
387 <1.0
153 <1.0
65.3 <1.0
82 <1.0
112 <1.0
45.9 <1.0
93.4 <1.0
49 <1.0
92.9 <1.0
19.1 <1.0
64.3 <1.0
143 <1.0
98 <1.0
92 <1.5
170 <1.0
171 <1.0
54.5 <1.0
54.5 <1.0
52.0 <1.0
60.6 <1.0
76.2 <1.0
99.8 <1.0
94.3 <1.0
91 .0 <1.0
113 <1.0
141 <1.0
220 <1.0
270 <1.0
277 <1.0
290 <20
248 <1.0
247 <1.0
202 <1.0
189 <1.0
150 <1.0
120 <1.0
138 <1.0
(3) As of March 2012 both north and south wild life ponds no longer receiving water.
NA = not analvzed -
Shaded indicates concentrations exceedinQ GWQS.
J = Approximate value
H = Sample was analvzed bevond holdmi;i times and mav not be accureate concentration.
NA NA <0.1
NA NA <0.1
43 NA <0.1
5.9 64 1.4
21 60 3
8.9 55 1.9
2.7 60 2.7
9.2 62 5.6
6.6 79 12.3
1.8 75 9.9
5.1 65 5.4
1 69 4.4
26 52 <0.1
<1.0 58 1.5
14 71 10.5
6.6 89 9.8
<1.0 73 9.6
<1.0 76 8.9
<1.0 79 8.8
<1.0 76 t?. <1.0 77 4.2
<1.0 64 4.7
<1.0 72 4.6
<1.0 71 3.3
<1.0 86 7
<1.0 81 5
<1.0 63 1.7
NA 38 0.4
1.4 NA
1.7 48 0.1
<1.0 -----------------53 <0.1 --------
<1.0 59 <0.1
<1.0 59 <0.1
<1.0 58.1 <0.1
4.21 49.8 <0.1
<1.0 54.4 <0.1
<1.0 56.6 1.37
<1.0 66.8 3.16
<1.0 80.7 4.94
<1.0 80 5.1
<1.0 NA NA
<1.0 92.1 8.4
<1.0 65 4.3
<1.0 61 1.06
<1.0 65.8 1.18
<1.0 58.3 1.69
<1.0 56.5 1.63
<1.0 61 .3 1.89
<1.0 60 2.20
<1.0 66.7 2.78
<1.0 62.2 2.75
<1.0 60.6 1.81
<1.0 67.1 2.63
<1.0 54.2 2.12
1.9 J 64 2.00
<1.0 85.1 4.55
<1 .0 84.7 4.51
<1.0 62.5 2.83
<1.0 73 2.53
<1.0 68.8 2.88
<1.0 66.3 3.36
<1.0 71.5 2.43
<1.0 72.9 3.55
<1,0 88.6 3.37
<1 .0 84.1 3.12
<1 .0 76.2 3.91
<1.0 79.7 4.44
<1.0 77.4 4.74
<1.0 85.9 5.73
<1.0 85.6 5.74
<20 87.0 0.37 H
<1.0 92.6 5.82
<1.0 87.4 6.74
<1 .0 77.4 4.74
<1.0 89.9 4.85
<1.0 84.3 5.0
<1.0 93.2 4.2
<1.0 89.8 4.41
TABLE 1 (19 of 33)
Historic Summary Of Monrtoring Well Analytical Results Up To The 3rd Quarter 2022
Chloroform Contamination Investigation
DUSA White Mesa Mill
TW4-18 Parameter
Sampling Event IGWQS)
Carbon Tetrachloride Chloroform Chloromethane Methylene Chloride Chloride
15 ua/Ll 170 ua/Ll 130 ua/U 15 ua/Ll No GWQS (ma/L)
1stQtr 3/16/2005 NA 38 NA NA NA
2nd Qtr 5/25/2005 NA 29.8 NA NA NA
3rd Qtr 8/31/2005 <1.0 39 2.8 <1.0 NA
4thQtr 12/7/2005 <1.0 14 1.1 <1.0 41
1stQtr 3/9/2006 <1.0 12 1.6 <1.0 36
2nd Qtr 6/14/2006 <1.0 12 2.7 <1.0 35
3rdQtr 7/2012006 <1.0 10.8 <1.0 <1.0 35
4thQtr 11/812006 <1.0 12.5 <1.0 <1.0 34
1stQtr 2/2812007 <1.0 9.2 <1.0 <1.0 30
2ndQtr 6/27/2007 <1.0 8 <1.0 <1.0 28
3rd Qtr 8/15/2007 <1.0 8.9 <1.0 <1.0 32
4thQtr 10/1012007 <1.0 7.4 <1.0 <1.0 27
1stQtr 3/28/2008 <1.0 6.4 <1.0 <1.0 23
2nd Qtr 6/2512008 <1.0 5.7 <1.0 <1.0 23
3rdQtr 9/1012008 <1.0 8 <1.0 <1.0 26
4thQtr 10/15/2008 <1.0 9.4 <1.0 <1.0 30
1stQtr 3/412009 <1.0 ,·,· <1.0 <1.0 29
2nd Qtr 6/23/2009 <1.0 16 <1.0 <1.0 30
3rdQtr 9/1412009 <1.0 13 <1.0 <1.0 26
4thQtr 12/17/2009 <1.0 8.2 <1.0 <1.0 30
1stQtr 3/2412010 <1.0 69 <1.0 <1.0 41
2nd Qtr 6/14/2010 <1.0 29 <1.0 <1.0 35
3rdQtr 8/12/2010 <1.0 29 <1.0 <1.0 37
4thQtr 10/15/2010 <1.0 30 <1.0 <1.0 50
1stQtr 2/22/2011 <1.0 39 <1.0 <1.0 52
2nd Qtr 5/26/2011 <1.0 26 <1.0 <1.0 36
3rd Qtr 8/17/2011 <1.0 29 <1.0 <1.0 23
4thQtr 11/16/2011 NA NA NA NA 23
.. .l!l 12/7/2011 <1.0 28 <1.0 <1.0 NA
1st Qtr(2) 1/18/2012 <1.0 25 <1.0 <1.0 18
2nd Qtr ---6/13/2012 <1.0 -------24 <1.0 ______ <1.0 ------30
3rd Qtr 9/11/2012 <1.0 38 <1.0 <1.0 26
4th Qtr 10/3/2012 <1.0 30 <1.0 <1.0 27
1st Ctr 2/13/2013 <1.0 34jj <1.0 <1.0 23.1
2nd Qtr 6/13/2013 <1.0 37.9 <1.0 <1.0 22.9
3rd Qtr 9/5/2013 <1.0 41 <1.0 <1.0 36.2
4th Qtr 11/13/2013 <1.0 44.3 <1.0 <1.0 37.1
1stQtr 1/30/2014 <1.0 6.93 <1.0 <1.0 38.9
2nd Qtr 5/22/2014 <1.0 6.93 <1.0 <1.0 47
3rd Qtr 8/14/2014 <1.0 32.8 <1.0 <1.0 49
4th Qtr 10/28/2014 <1.0 33 <1.0 <1.0 40.8
1stQtr 3/12/2015 <1.0 32 <1.0 <1.0 41.6
2nd Qtr 6/11/2015 <1.0 30.5 <1.0 <1.0 43.5
3rd Qtr 9/3/2015 <1.0 28.7 <1.0 <1.0 47.6
4th Qtr 10/28/2015 <1.0 52.9 <1.0 <1.0 39.4
1stQtr 3/17/2016 <1.0 56.6 <1.0 <1.0 40.7
2nd Qtr 6/8/2016 <1.0 60 <1.0 <1.0 43.8
3rd Qtr 8/312016 <1.0 56.3 <1.0 <1.0 40.7
4thQtr 10/2612016 <1.0 60.1 <1.0 <1.0 43.9
1stQtr 3/16/2017 <1.0 62 <1.0 <1.0 39.4
Duphcate TW4-75 <1.0 61.5 <1.0 <1.0 41.1
2nd Qtr 6/20/2017 <1.0 63.8 <1.0 <1.0 41.6
3rd Qtr 8/3/2017 <1.0 62.8 <1.0 <1.0 40.4
Duplicate TW4-75 <1.0 62.3 <1.0 <1.0 41.5
4th.Otr 10/11/2017 <1.0 62.9 <1.0 <1.0 37.1
1stQtr 3/15/2018 <1.0 62.3 <1.0 <1.0 44.3
2nd Qtr 6/13/2018 <1.0 59.9 <1.0 <1.0 39.5
3rd Qtr 8/30/2018 <1.0 56.2 <1.0 <1.0 45.6
4thQtr 12/13/2018 <1.0 57.6 <1.0 <1.0 38.2
1stQtr 3/19/2019 <1.0 52.8 <1.0 <1.0 37.6
2ndQtr 6/19/2019 <1.0 54.2 <1.0 <1.0 39.5
Duplicate TW4-75 <1.0 54.4 <1.0 <1.0 40.8
3rdQtr 9/11/2019 <1.0 56.2 <1.0 <1.0 36.8
4thQtr 12/1812019 <1.0 62.0 <1.0 <1.0 42.7
1stQtr 3/1812020 <1.0 57·0 <1.0 <1.0 39.4
2nd Qtr 6/12/2020 <1.0 58.2 <1.0 <1.0 41.4
3rdQtr 9/1812020 <1.0 60.0 <1.0 <1.0 38.7
4thQtr 11/11/2020 <1.0 58.6 <1.0 <1.0 39.6
DWMRC SC lit samole <10 56.0 <20 <20 41.0
1stOtr 3/18/2021 <1.0 52.0 <1.0 <1.0 41.8
2nd Qtr 6/1612021 <1.0 58.2 <1.0 <1.0 41.4
3rdQtr 9/22/2021 <1.0 49.9 <1.0 <1.0 29.8
4thQtr 12/812021 <1.0 57.0 <1.0 <1.0 41.1
1stQtr 3/23/2022 <1.0 56.0 <1.0 <1.0 39.1
2ndQtr 6/22/2022 <1.0 62.9 <1.0 <1.0 48.1
3rdQtr 9/1412022 <1.0 60.6 <1.0 <1.0 44.7
(1) voes were resampled because laboratory missed holding time. (2) As of March 2012 both north and south wild tile ponds no longer receiving water.
NA = not analyzed -----
Shaded indicates concentrations exceedinQ GWQS.
Nitrate, Nitrate + Nrtrite
110 ma/Ll
14.1
12.9
13.3
7.3
5.9
4.7
6.1
5.7
5.1
4.9
5.0
4.4
0.7
4.6
4.9
5.2
5.2
6.2
5.9
5.4
5.1
9.0
9.0
10.0
10.0
9.0
4.6
6.3
NA
4.4
6'.6
6.6
6.0
5.6
8.9
12.1
14.2
12.8
12.2
9.8
11.1
11.7
9.69
15.7
6.24
5.96
5.45
5.79
5.24
4.47
4.41
4.50
4.24
4.31
4.43
4.32
4.09
3.51
3.60
3.85
4.01
2.95
3.25
3.02
3.71
3.62
3.36
3.67
3.30
3.61
3.62
3.37
3.90
3.4
3.4
3.46
TW4-19
(chlorofrom pumping well
started 4/30/03)
Sampling Event
1stQtr 3/16/2005
2ndQtr 5/25/2005
3rdQtr 8/31/2005
4thOtr 12m 2005
1stQtr 3/9/2006
2ndQtr 6/14/2006
3rdQtr 7/20/2006
4thQtr 11/8/2006
1st Qtr 2/28/2007
2ndQtr 6/27/2007
3rdQtr 8/15/2007
4thQtr 10/10/2007
1stQtr 3/28/2008
2nd Qtr 6/25/2008
3rdQtr 9/10/2008
4thQtr 10/15/2008
1stQtr 3/4/2009
2nd Qtr 6/23/2009
TABLE 1 (20 of 33)
Historic Summary Of Monitoring Well Analytical Results Up To The 3rd Quarter 2022
Chloroform Contamination Investigation
DUSA White Mesa Mill
Parameter
(GWQS)
Carbon Tetrachloride Chloroform Chloromethane Methylene Chloride Chloride
15 uo/L\ 170 uo/L\ 130 uo/L\ 15 ua/Ll No GWQS lma/Ll
NA 2,200 NA NA NA
NA 1,200 NA NA NA
<5.0 1,400 <5.0 <5.0 NA
<50 2,800 <50 <50 81
<50 1,200 <50 <50 86
<50 1,100 <50 <50 116
<50 1,120 <50 <50 123
1.6 1 050 2.6 <1.0 134
1.3 1,200 <1.0 <1.0 133
Did not sample
1.9 1,100 <1.0 <1.0 129
1.9 1 100 <1.0 <1.0 132
2.9 1,800 <1.0 <1.0 131
<1.0 1,000 <1.0 <1.0 128
8.6 3,600 <1.0 <1.0 113
12 4 200 <1.0 <1.0 124
1.2 1,100 <1.0 <1.0 127
1.2 990 <1.0 <1.0 132
Nitrate, Nitrate + Nitrite
110 ma/Ll
5.3
5.7
4.6
<0.1
4
5.2
4.3
4.6
4
4.1
4
2.2
2.8
35.2
47.8
3.2
2.4
3rdQtr 9/14/2009 15 6,600 <1.0 <1.0 43 <0. 1
4thQtr 12/22/2009 16 4 700 <1.0 <1.0
1stQtr 2/17/2010 1.3 940 <1.0 <1.0
2nd Qtr 6/14/2010 4.2 1,800 <1.0 <1.0
3rd Qtr 8/16/2010 4.9 2,000 <1.0 <1.0
4thQtr 10/15/2010 1.3 1200 <1.0 <1.0
1stQtr 2/17/2011 17 3,400 <1.0 <1.0
2nd Qtr 6/7/2011 8.3 4,000 <1.0 <1.0
3rd Qtr 8/17/2011 2.1 970 <1.0 <1.0
4thQtr 11/16/2011
[1\ 12/5/2011 5.4 2 200 <1.0 <1.0
1st Qtr (2) 1/23/2012 1.5 ~----~5_2 <1.0 <1.0 -----------<1.0 ______
2nd Qtr 6/6/2012 1.1 460 <1.0
3rd Qtr 9/4/2012 3.5 950 <1.0 <1.0
4thQtr 10/3/2012 4 1500 <1.0 <1.0
1s1Qtr 2/13/2013 5.15 4,210 <1.0 <1.0
2nd Qtr 6/5/2013 5.15 2,070 <1.0 <1.0
3rd Qtr 9/3/2013 20.7 8,100 <1.0 <1.0
4thQtr 10/29/2013 6.42 942 <1.0 <1.0
1stQtr 1/27/2014 4.05 586 <1.0 <1.0
2nd Qtr 5/19/2014 5.51 810 <1.0 <1.0
3rd Qtr 8/11/2014 1.9 1,410 8.3 <1.0
4thQtr 10/21/2014 4.8 4 310 <1.0 <1.0
1s1Qtr 3/9/2015 8.92 4,660 <1.0 <1.0
2nd Qtr 6/8/2015 2.62 1,570 <1.0 <1.0
3rd Qtr 8/31/2015 <1.0 7,860 7.78 <1.0
4thQtr 10/19/2015 12.2 7 840 5.46 <1.0
1s1Qlr 3/9/2016 13.5 7,780 1.4 <1.0
2nd Qtr 5/26/2016 23.1 12,600 <1.0 <1.0
3rdQtr 7/25/2016 9.89 6,040 <1.0 <1.0
4thQtr 10/13/2016 10.8 6640 <1.0 <1.0
1s1Qlr 3/8/2017 3.06 1,240 <1.0 <1.0
2nd Qtr 6/13/2017 1.35 510 <1.0 <1.0
3rdQtr 7/26/2017 13.0 8,840 <1.0 <1.0
4thQtr 10/11/2017 <1.0 129 <1.0 <1.0
1s1Qtr 3/12/2018 1.36 2,640 <1.0 <1.0
2ndQtr 6/8/2018 3.45 2,980 <1.0 <1.0
3rdQtr 8/30/2018 2.03 1,910 <1.0 <1.0
4thQtr 11/28/2018 6.18 5 270 <1.0 <1.0
1stQtr 3/8/2019 2.43 2,050 <1.0 <1.0
2nd Qtr 6/5/2019 15.9 11,500 <1.0 <1.0
3rdQtr 9/4/2019 10.1 6,670 <1.0 <1.0
4thQtr 12/10/2019 <1.0 551 <1.0 <1.0
1s1Qtr 2/19/2020 13.7 8,720 5.41 <1.0
2nd Qtr 5/27/2020 10.4 7,600 <1.0 <1.0
3rdQtr 9/4/2020 1.98 1,350 <1.0 <1.0
4thQtr 10/28/2020 1.1 660 <1.0 <1.0
1s1Qtr 2/23/2021 8.4 6,660 5.41 <1.0
2nd Qtr 6/9/2021 <1.0 775 <1.0 <1.0
3rdQtr 8/24/2021 7.83 4,450 1.98
4thQtr 12/1/2021 13.2 6 950 <1.0 <1.0
1s1Qtr 3/9/2022 <1.0 654 <1.0 <1.0
2nd Qtr 6/8/2022 2.7 2,540 4 <1.0
3rdQtr 8/30/2022 2.5 4 750 <1.0
(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 exceedin9 GWQS.
124 26.7
144 2
132 4.4
142 5.9
146 2.7
135 17.0
148 12.0
148 3.0
148 5.0
138 0.6
--------149 ------------2.4
149 2.5
150 4.1
164 8.0
148 ~ 179 17.6
134 4.7
134 1.6
152 1.3
140 1.6
130 4.7
238 8.56
180 0.916
326 11.6
252 10.6
276 15.70
204 1.27
214 10.5
200 10.0
461 ,,_,
135 0.243
218 1.120
139 0.377
193 8.6
138 0.494
166 2.55
140 0.233
197 6.58
160 8.96
153 0.33
147 0.535
205 10.1
147 1.14
188 11.6
104 1.1
167 6.6
115 4.04
1.25 172 6.68
184 11.0
119 1.7
128 1.4
<1.0 178 4.76
TABLE 1 (21 of 33)
· Historic Summary Of Monitoring Well Analytical Results Up To The 3rd Quarter 2022
Chloroform Contamination Investigation
DUSA White Mesa Mill
TW4-20 Parameter
(chloroform pumping well (GWQS)
started 8/4/05)
Sampling Event Carbon Tetrachloride Chloroform Chloromethane Methylene Chloride
(5 ua/Ll (70 ua/Ll 130 ua/Ll (5 ua/Ll
1stQtr 3/16/2005 Monitor well was not installed
2nd Qtr (3) 5/25/2005 NA 39,000 NA NA
3rd Qtr ____ 8/31/2005 <10 -------3 ,800 +---------<10 ------<10
4thQtr 12/712005 <250 19,000 <250 <250
1st Qtr 31912006 <500 9,200 <500 <500
2nd Qtr 611412006 <500 61,000 <500 <500
3rdQtr 712012006 <1000 5,300 <1000 <1000
4th Qtr 1118/2006 7.1 11 000 1.9 2.2
1stQtr 2128/2007 3.1 4,400 <1.0 1.1
12nd Qtr 612712007 2.2 1,800 <1 .0 <1.0
l3rdQtr 8/1512007 3.5 5,200 <1 .0 1.8
Ot, 1011012007 6.8 9 000 <1.0 1.9
Qtr 3/2812008 9 13,000 <1.0 1.5
Qtr 612512008 13 30,000 <1 .0 1.2
Qtr 9/1012008 15 21,000 <1.0 3.7
Qtr 1011512008 NA NA NA NA
stQtr 31412009 5.7 8,200 <1 .0 5.2
nd Qtr 6/2312009 4.9 6,800 <1 .0 4.2
rd Qtr 9/1412009 8.4 13,000 <1 .0 4.4
h Qtr 1212212009 14 15 000 <1 .0 3.0
stQtr 211712010 2.7 3,500 <1.0 3.2
ndQtr 611412010 11 18,000 <1 .0 3.7
rdQtr 8/1612010 12 15,000 <1.0 2.2
i4thQtr 1011512010 20 24 000 <1.0 5.5
1stQtr 21171201 1 27 31,000 <1.0 19.0
2ndQtr 61712011 10 8,100 <1 .0 2.1
3rdQtr 811712011 7.3 3,800 <1 .0 3.1
4th.Otr. 11116/2011 7.2 7 900 <1 .0 2.5
1stQtr(2) 1123/2012 10 11,000 <1.0 1.3
2nd Qtr 6/6/2012 ---------33 ---36,000 <1.0 ______ <1.0 -------
3rd Qtr 9/4/2012 26 13,000 <1 .0 <1.0
4thQtr 10/3/2012 22 19 000 <1.0 <1.0
1stQtr 2/11/2Cff:i' 19.6 18,500 <1.0 1.21
2ndQtr 6/5/2013 32.5 26,300 <1.0 1.3
3rdQtr 913/2013 25.7 26,800 <1.0 2.14
UhQtr 10129/2013 17.3 15 700 <1.0 1.37
1stQtr 1127/2014 18.4 17,800 <1.0 2.04
2nd Qtr 5/19/2014 22.1 22,100 2.31 3.98
3rdQtr 8/11/2014 14.1 12,400 55.2 2.2
4thQtr 10/21/2014 18.5 23 300 4.04 2.38
1stQtr 3/9/2015 20.8 19,900 4.85 1.38
2ndQtr 6/8/2015 16.2 17,600 13.4 1.73
3rd Qtr 8/31/2015 15.1 17,000 12.3 <1.0
4thQtr 10/1912015 14.5 17 000 10.8 1
1stQtr 319/2016 20.2 21,600 4.09 1.16
2ndQtr 5/23/2016 40.6 33,700 <1.0 <1.0
3rdQtr 7/2512016 26.6 23,600 <1.0 <1.0
4thQtr 10/12/2016 24.4 21 300 <1.0 <1.0
1stQtr 31812017 23.5 23,400 <1.0 <1.0
2nd Qtr 6/1312017 23.4 18,100 <1.0 <1.0
3rd Qtr 7/26/2017 25.0 27,600 1.25 <1.0
4thQtr 10/12/2017 11.2 11 600 2.34 <1.0
1stQtr 3112/2018 15.9 15,400 1.77 2.36
2ndQtr 6/14/2018 <1.0 12,000 <1.0 7.77
3rd Qtr 8/22/2018 9.85 10,500 4.98 <1.0
4thQtr 11/28/2018 8.32 9 500 15.6 <1.0
1stQtr 3/8/2019 15.4 15,600 <1.0 <1.0
2nd Qtr 6/5/2019 10.1 13,700 <1.0 <1.0
3rdQtr 9/4/2019 8.39 10,500 <1.0 <1.0
4th Qtr 12/10/2019 5.92 8 790 2.67 <1.0
1stQtr 2/19/2020 8.6 14,300 10.7 <1.0
2ndQtr 5127/2020 6.74 5,800 1.3 12.3
Well TW4-20 Abandoned in October 2020
(1) voes were resampled because laboratory missed holdmg time
(2) As of March 2012 both north and south wild life ponds no longer receiving water.
(3) Chloroform_pump1~ welt started 8/4/05
NA= not analyzed
Bold and italics indicates the MDL exceeded the GWQS
Shaded indicates concentrations exceedinQ GWQS.
Chloride
No GWQS fmo/Ll
NA
NA --------
131
120
235
134
124
124
112
117
170
132
191
156
168
164
164
153
187
179
200
196
203
220
177
207
186
207 --------262
289
302
252
250
260
272
254
269
299
292
290
296
365
293
293
318
307
301
290
281
292
293
289
258
282
295
272
279
286
307
310
3.01
Nitrate, Nitrate + Nitrite
110 mo/Ll
10.10 -----------· 2.90
1.80
3.80
9.40
2.90
3.50
4.20
2.30
2.10
5.60
0.90
8.00
4.44
5.51
5.10
2.90
3.30
5.30
2.00
5.60
5.30
4.60
4.40
4.80
6.50
4.20
----------7YQ 11 .00
10.80
11 .00
9.07
9.80
8.65
9.64
7.56
5.95
4.30
7.67
9.80
5.76
9.3
6.23
10.30
11.2
11.3
11.4
12.0
9.76
10.8
8.91
9.5
10.40
8.14
9.72
6.7
9.59
10.20
9.75
9.81
7.23
TABLE 1 (22 of 33)
Historic Summary Of Monitoring Well Analytical Results Up To The 3rd Quarter 2022
Chloroform Contamination Investigation
DUSA White Mesa Mill
TW4-21 Parameter
(chloroform pumping well (GWQS)
619/15)
Sampling Event Carbon Tetrachloride Chloroform Chloromethane Methylene Chloride
15 ua/Ll 170 ua/Ll 130 ua/Ll (5 ~g/L)
1stQtr 3/16/2005 Monitor well was not installed
2nd Qtr 5/25/2005 NA 192 NA NA
3rdQtr 8/31/2005 <5.0 78 <5.0 <5.0
4thQtr 12m 2005 <1.0 86 <1.0 <1.0
1stQtr 3/9/2006 <2.5 120 <2.5 <2.5
2ndQtr 6/14/2006 <2.5 120 <2.5 <2.5
3rd Qtr 7/20/2006 <2.5 108 <2.5 <2.5
4thQtr 11/8/2006 2 139 <1.0 <1.0
1stQtr 2/28/2007 1.8 160 <1.0 <1.0
2ndQtr 6/27/2007 5.8 300 <1.0 <1.0
3rdQtr 8/15/2007 <1.0 140 <1.0 <1.0
4thQtr 10/10/2007 <1.0 120 <1.0 <1.0
1stQtr 3/28/2008 7 390 <1.0 <1.0
2ndQtr 6/25/2008 1.7 180 <1.0 <1.0
3rdQtr 9/10/2008 1.6 120 <1.0 <1.0
4thQtr 10/15/2008 NA #NIA NA NA
11/18/2008 2 170 <2.0 <2.0
1stQtr 3/11/2009 <1.0 180 ·:;;1_0 <1.0
2ndQtr 6/23/2009 <1.0 200 <1.0 <1.0
3rdQtr 9/14/2009 <1.0 200 <1.0 <1.0
4th Qtr 12/22/2009 <1.0 160 <1.0 <1.0
1st0tr 2/25/2010 <1.0 170 <1.0 <1.0
2nd Qtr 6/14/2010 <1.0 210 <1.0 <1.0
3rd Qtr 8/13/2010 9.2 390 <1.0 <1.0
4thQtr 10/15/2010 1.2 200 <1.0 <1.0
1stQtr 2/22/2011 1.2 230 <1.0 <1.0
2nd Qtr 6/28/2011 4.8 290 <1.0 <1.0
3rd Qtr 8/17/2011 6.3 460 <1.0 <1 .0
4th Qtr 11/16/2011
........ J1l 12/7/2011 6.7 390 <1.0 <1.0
fsi Qtr (2) 1/23/2012 6.4 420 <1.0 <1.0
2nd Qtr ----6/6/2012 5.4 ~----400 <1.0 ______ <1.0 -
3rd Qtr 9/4/2012 6 410 <1.0 <1.0
4th Qtr 10/3/2012 7 390 <1.0 <1.0
1stOtr 2/11/2013 5.25 282 <1.0 <1.0
2nd Qtr 6/5/2013 3.49 328 <1.0 <1.0
3rd Qtr 9/3/2013 2.13 244 <1.0 <1.0
4th Qtr 10/29/2013 <1.0 204 <1.0 <1.0
1stQtr 1/27/2014 6.23 220 <1.0 2.04
2nd Qtr 5/19/2014 4.73 240 <1.0 2.04
3rd Qtr 8/11/2014 <1.0 204 <1.0 <1.0
4th .. Otr 10/21/2014 1.04 229 <1.0 <1.0
1st Ctr 3/9/2015 1.75 292 <1.0 <1 .0
2nd Qtr (3) 6/8/2015 1.92 366 <1.0 <1.0
3rd Qtr -8/31/2015 <1.0 ---------281 <1.0 ______ <1.0 -----
4th Qtr 10/19/2015 <1.0 339 <1.0 <1 .0
1stQtr 3/9/2016 <1.0 390 <-1.0 <1 .0
2nd Qtr 5/23/2016 <1.0 545 <1.0 <1.0
3rd Qtr 7/25/2016 <1.0 456 <1.0 <1.0
4thQtr 10/12/2016 <1.0 456 <1.0 <1.0
1stQtr 3/8/2017 2.36 598 <1.0 <1.0
2nd Qtr 6/13/2017 1.16 224 <1.0 <1.0
3rd Qtr 7/26/2017 1.05 537 <1.0 <1.0
4thQtr 10/11/2017 <1.0 466 <1.0 <1.0
0WMRC s ht samnle <3.8 400 <6.0 14 J
1stQtr 3/12/2018 2.36 421 <1.0 <1.0
2nd Qtr 6/8/2018 <1.0 532 <1.0 <1.0
3rd Qtr 8/22/2018 <1.0 476 <1.0 <1.0
4thQtr 10/22/2018 <1.0 585 <1.0 <1.0
1stQtr 3/8/2019 <1.0 323 <1.0 <1.0
2nd Qtr 6/5/2019 <1.0 734 <1.0 <1.0
3rdQtr 9/4/2019 <1.0 596 <1.0 <1 .0
4thQtr 12/10/2019 <1.0 794 <1.0 <1.0
1st Ctr 2/19/2020 <1.0 844 2.58 <1.0
2nd Qtr 5/27/2020 <1.0 767 <1.0 <1 .0
3rdQtr 9/4/2020 <1.0 920 <1.0 <1 .0
4thQtr 10/28/2020 <1.0 948 <1.0 <1.0
1stQtr 2/23/2021 <1.0 400 <1.0 <1.0
2nd Qtr 6/9/2021 <1 .0 1,130 <1.0 <1.0
3rdQtr 8/24/2021 <1.0 669 <1.0 <1.0
4thQtr 12/1/2021 <1.0 649 <1.0 <1.0
1stQtr 3/9/2022 <1.0 469 <1.0 <1.0
2nd Qtr 6/8/2022 <1.0 657 <1.0 <1 .0
3rdQtr 8/30/2022 <1.0 1 070 <1.0 <1.0
(1) voes were resampled because laboratory missed holding time
(2) As of March 2012 both north and south wild llfe ponds no longer receiving water.
{3) Chloroform pumping well started 6/9/15
-NA ;""nOt'an'a1vzed
Shaded indicates concentrations exceed1nf:I GWQS.
J = Approximated value
Chloride
No GWQS Imo/LI
NA
NA
353
347
318
357
296
306
327
300
288
331
271
244
284
NA
279
291
281
256 ii-a
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
100·
456
478
339
446
353
382
411
454
461
375
227
110
331
425
Nitrate, Nitrate + Nitrite
110 mn/L\
14.6
10.1
9.6
8.5
10.2
8.9
8.7
8.7
8.6
8.6
8.3
14.3
8.8
7.57
8.0
#NIA
8.3
8.1
9.2
8.4
8.4
12.0
14.0
7.0
9.0
12.0
14.0
13.0
15.0 -------------11.0
13.0
14.0
11.8
13.8
10.3
9.0
11.4
11.5
7.1
10.0
10.9
13.1
14'7
14.3
14.6
13.1
16.5
13.5
17.7
9.53
18.20
16.90
11
15.8
14.1
0.236
15.2
8.99
17.5
14.7
5.73
8.93
15.4
12.6
16.3
15.20
21.5
12.9
17.2
2.2
8.9
14.3
TABLE 1 (23 of 33)
Historic Summary Of Monitoring Well Analytical Results Up To The 3rd Quarter 2022
Chloroform Contamination Investigation
DUSA White Mesa Mill
TW4-22 Parameter
(nitrate pumping well started (GWQS) 1126113)
Sampling Event Carbon Tetrachloride Chloroform Chloromethane Methylene Chloride
(5 ua/Ll 170 un/L\ 130 un/LI 15 ua/Ll
1st Ctr 3/16/2005 Monitor well was not installed
2nd Ctr 5/25/2005 NA 340 NA NA
3rd Ctr 8/31/2005 <5.0 290 <5.0 <5.0
4th Ctr 12/7/2005 <5.0 320 <5.0 <5.0
1st Ctr 3/9/2006 <10 390 <10 <10
2nd Ctr 6/14/2006 <10 280 <10 <10
3rd Ctr 7/20/2006 <10 864 <10 <10
4th Ctr 11/8/2006 <1.0 350 1.6 <1.0
1st Ctr 2/28/2007 <1.0 440 <1.0 <1.0
2nd Ctr 6/27/2007 <1.0 740 <1.0 <1 .0
3rd Ctr 8/15/2007 <1.0 530 <1.0 <1 .0
4th Ctr 10/10/2007 <1.0 440 <1.0 <1 .0
1stQtr 3/28/2008 <1.0 1,400 <1.0 <1.0
2nd Ctr 6/25/2008 <1.0 1,200 <1.0 <1 .0
3rd Ctr 9/10/2008 1.3 6,300 <1.0 <1.0
4th Ctr 10/15/2008 NA #N/A NA NA
11/18/2008 <2.0 630 <2.0 <2.0
1st Ctr 3/11/2009 <1.0 390 <1.0 <1.0
2nd Ctr 6/23/2009 <1.0 730 <1.0 <1.0
3rd Ctr 9/14/2009 <1.0 2,300 <1.0 <1.0
4th Ctr 12/29/2009 <1.0 380 <1.0 <1.0
1st Ctr 3/23/2010 <1.0 2,200 <1.0 <1.0
2nd Ctr 6/14/2010 <1.0 540 <1.0 <1.0
3rd Ctr 8/24/2010 <1.0 340 <1.0 <1.0
4th Ctr 10/15/2010 <1.0 340 <1.0 <1.0
1st Ctr 2/22/2011 1.2 1,300 <1.0 <1.0
2nd Ctr 6/1/2011 <1 .0 210 <1.0 <1.0
3rd Ctr 8/17/2011 <1 .0 450 <1.0 <1.0
4th Ctr 11/16/2011 NA #N/A NA NA
1stOtrW i~iYi~gg <1 .0 400 <1.0 <1.0
<1.0 200 <1.0 <1.0
2nd Ctr ---6/13/2012 ----,20 ~--------<1.0 --------<1 ,0 <1.0
3rd Ctr 9/1212012 <1 .0 121 <1.0 <1.0
4th Ctr 10/4/2012 <1.0 330 <1.0 <1.0
1stCtr(3) 2111/2013 3.24 ---10,600 <1.0 ______ <1.0 --------
2nd Ctr 6/5/2013 3.35 12,500 <1.0 <1.0
3rd Ctr 9/3/2013 3.25 9,640 <1.0 <1 .0
4th Ctr 10/29/2013 8.09 13 300 <1.0 <1.0
1stQtr 1/27/2014 6.06 12,100 <1.0 2.83
2nd Qtr 5/19/2014 6.65 12,400 <1.0 <1.0
3rd Ctr 8/11/2014 1.9 12,400 40 <1.0
4th Ctr 10/29/2014 3.32 12 400 1.61 <1.0
1st Ctr 3/9/2015 3.77 12,700 4.31 <1.0
2nd Ctr 6/8/2015 2.42 8,050 3.42 <,1.0
3rd Ctr 8/31/2015 <1 .0 7,810 5.47 <1.0
4th Ctr 10/19/2015 3.32 7 530 5.1 <1.0
1st Ctr 3/9/2016 <1.0 6,070 <1.0 <1.0
2nd Ctr 5/23/2016 2.64 8,570 <1.0 <1.0
3rd Ctr 7/25/2016 <1.0 5,840 <1.0 <1.0
4th Ctr 10/12/2016 1.08 3 370 <1.0 <1.0
1st Ctr 3/8/2017 1.56 5,320 <1.0 <1.0
2nd Ctr 6/13/2017 1.21 3,670 <1.0 <1.0
3rd Ctr 7/26/2017 <1.0 5,150 <1.0 <1.0
4th Ctr 10/11/2017 <1.0 4,770 <1.0 <1.0
DWMRC. split samnle <38 4 100 <60 15Q).
1st Ctr 3/12/2018 <1.0 4,530 <1.0 <1.0
2nd Ctr 6/8/2018 <1.0 3,010 <1.0 <1.0
3rd Ctr 8/22/2018 <1.0 3,600 <1.0 <1.0
4th Ctr 11/28/2018 <1.0 2 680 <1.0 <1.0
1st Ctr 3/8/2019 1.02 4,310 <1.0 <1.0
2nd Ctr 6/5/2019 1.13 4,690 <1.0 <1 .0
3rdQtr 9/4/2019 <1.0 3,460 <1.0 <1.0
4th Ctr 12/10/2019 <1.0 3 820 <1.0 <1.0
1stQtr 2/19/2020 1.02 3,910 <1.0 <1.0
2nd Ctr 5/27/2020 <1.0 2,530 <1.0 <1.0
3rd Ctr 9/4/2020 <1.0 3,760 <1.0 <1.0
4th Ctr 10/28/2020 6.83 3 640 <1.0 <1.0
1st Ctr 2/23/2021 <1.0 5,100 <1.0 <1 .0
2nd Ctr 6/9/2021 <1.0 4,520 <1.0 <1.0
3rd Ctr 8/24/2021 <1.0 3,510 <1.0 <1 .0
4th Ctr 12/1/2021 <1.0 3 330 <1.0 <1 .0
1st Ctr 3/9/2022 <1.0 3,320 <1.0 <1 .0
2ndQtr 6/8/2022 <1.0 2,600 4.4 <1.0
3rd Ctr 8/30/2022 <1.0 3 190 <1.0 <1.0
(1) VOCs were resampled because laboratory missed holding time.
(2) As of March 2012 both north and south wild life ponds no longer receiving water.
(3) Chloroform pum..e,1!!9 well started 1126/13 _______ .
NA = not analyzed
Shaded indicates concentrations exceedini:i GWOS.
Bold and italics indicates the MOL exceeded the GWOS.
J = Approximated value
Chloride
No GWQS Ima/LI
NA
NA
253
236
221
221
236
347
273
259
238
519
271
524
539
NA
177
177
391
175
427
134
130
134
114
138
120
174
NA
36 ------35
130
--------130
586
487
501
598
614
540
596
675
390
557
567
583
598
619
588
566
572
391
600
610
607
580
613
567
528
662
588
608
606
578
514
523
618
408
410
586
442
564
637
Nitrate, Nitrate + Nitrite
l10ma/LI
18.2
15.7
15.1
15.3
14.3
14.5
15.9
20.9
19.3
19.3
18.8
39.1
41.9
38.7
36.3
#NIA
20.7
20.6
40.3
17.8
36.8
19.0
15.0
16.0
18.0
17.0
15.0
19.0
#N/A
14.0
12.8
7.0
14.0
58.0
50.2
29 7
45.2
54.6
47.2
41.5
54.9
69.2
47.1
64.7
56.1
31.1
58.4
61.3
61.5
69.8
70.8
66.1
80.1
79.0
62.3
72.5
55.4
75.7
71.9
83.9
72.5
59.9
57.7
60.5
64.8
64.9
69.6
89.3
35.1
68.8
40.4
45.0
69.9
TABLE 1 (24 of 33)
Historic Summary Of Monitoring Well Analytical Results Up To The 3rd Quarter 2022
Chloroform Contamination Investigation
DUSA White Mesa Mill
TW4-23
Sampling Event
Carbon Tetrachloride Chloroform Chloromethane
15 ua/Ll 170 ua/Ll 130 ua/Ll
2nd Qtr 6/27/2007 <1.0 <1.0 <1.0
3rdQtr 8/15/2007 <1.0 <1.0 <1.0
4thQtr 10/10/2007 <1.0 <1.0 <1.0
1stQtr 3/28/2008 <1.0 <1.0 <1.0
2ndQtr 6/25/2008 <1.0 <1.0 <1.0
3rdQtr 9/10/2008 <1.0 <1.0 <1.0
4thQtr 10/15/2008 NA NA NA
11/18/2008 <2.0 <2.0 <2.0
1stQtr 3/4/2009 <1.0 <1.0 <1.0
2ndQtr 6/23/2009 <1.0 <1.0 <1.0
3rdQtr 9/14/2009 <1.0 <1.0 <1.0
4thQtr 12/16/2009 <1.0 <1.0 <1.0
1stQtr 3/24/2010 <1.0 <1.0 <1.0
2ndQtr 6/14/2010 <1.0 <1.0 <1.0
3rdQtr 8/24/2010 <1.0 <1.0 <1.0
4thQtr 10/15/2010 <1.0 <1.0 <1.0
1st Qtr 2/16/2011 <1.0 <1.0 <1.0
2nd Qtr 6/14/2011 <1.0 <1.0 <1.0
3rdQtr 8/16/2011 <1.0 <1.0 <1.0
4thQtr 11/15/2011 <1.0 <1.0 <1.0
1st Qtr (1) 1/17/2012 <1.0 <1.0 <1.0
2nd Qtr 5/31/2012 <1.0 <1.0 ____ <1.0 ______
3rd Qtr 8/29/2012 <1.0 <1.0 <1.0
4th Qtr 10/3/2012 <1.0 <1.0 <1.0
1st Qtr 2m 2013 <1.0 <1.0 <1.0
2nd Qtr 5/30/2013 <1.0 <1.0 <1.0
3rd Qtr 9/5/2013 <1.0 <1.0 <1.0
4th Qtr 11/7/2013 <1.0 <1.0 <1.0
1st Qtr 1/23/2014 <1.0 <1.0 <1.0
2nd Qtr 5/19/2014 <1.0 <1.0 <1.0
3rd Qtr 8/13/2014 <1.0 <1.0 <1.0
4th Qtr 10/28/2014 <1.0 <1.0 <1.0
1stQtr 3/12/2015 <1.0 <1.0 <1.0
2nd Qtr 6/8/2015 <1.0 <1.0 <1.0
3rd Qtr 9/3/2015 <1.0 <1.0 <1.0
4thQtr 10/28/2015 <1.0 <1.0 <1.0
Duclicate TW4-70 <1.0 <1.0 <1.0
r•tOtr 3/16/2016 <1.0 <1.0 <1.0
2nd Qtr 5/26/2016 <1.0 <1.0 <1.0
3rd Qtr 8/23/2016 <1.0 <1.0 <1.0
Duplicate TW4-70 <1.0 <1.0 <1.0
14th Qtr 10/12/2016 <1.0 <1.0 <1.0
I1stQtr 3/15/2017 <1.0 <1.0 <1.0
Duplicate TW4-70 <1.0 <1.0 <1.0
12nd Qtr 6/15/2017 <1.0 <1.0 <1.0
3rd Qtr 8/2/2017 <1.0 <1.0 <1.0
4th Qtr 10/10/2017 <1.0 <1.0 <2.0
OWMRC scllt samole <1.0 <1.0 <2.0
11stQtr 3/14/2018 <1.0 <1.0 <1.0
2nd Qtr 6/13/2018 <1.0 <1.0 <1.0
Duplicate TW4-70 <1.0 <1.0 <1.0
3rd Qtr 8/30/2018 <1.0 <1.0 <1.0
4thQtr 12/12/2018 <1.0 <1.0 <1.0
1stQtr 3/16i2019 <1.0 <1.0 <1.0
2nd Qtr 6/13/2019 <1.0 <1.0 <1.0
3rdQtr 9/11/2019 <1.0 <1.0 <1.0
4thQtr 12/10/2019 <1.0 <1.0 <1.0
1stQtr 3/17/2020 <1.0 <1.0 <1.0
2nd Qtr 6/11/2020 <1.0 <1.0 <1.0
3rd Qtr 9/17/2020 <1.0 <1.0 <1.0
4thQtr 11/4/2020 <1.0 <1.0 <1.0
1stQtr 3/17/2021 <1.0 <1.0 <1.0
2nd Qtr 6/16/2021 <1.0 <1.0 <1.0
3rdQtr 9/15/2021 <1.0 <1.0 <1.0
4thQtr 12/8/2021 <1.0 <1.0 <1.0
Ou licate TW4-70 <1.0 <1.0 <1.0
·,-,t Qtr 3/22/2022 <1.0 <1.0 <1.0
Duplicate TW4-70 <1.0 <1.0 <1.0
2nd Qtr 6/16/2022 <1.0 <1.0 <1.0
3rdQtr 9/14/2022 <1.0 <1.0 <1.0
(1) As of March 2012 both north and south wild hfe ponds no longer receiving water.
NA= not analyzed
Shaded indicates concentrations exceedinQ GWQS.
J = Approximated value.
Parameter
IGWQS)
Methylene Chloride
15 ua/Ll
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
NA
<2.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0 --------
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<2.0
<2.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
Chloride Nitrate, Nitrate + Nitrite
No GWQS lma/Ll l10ma/Ll
47 <0.1
46 <0.1
43 <0.1
41 <0.1
41 <0.1
35 <0.05
51 <0.05
NA NA
41 <0.1
43 <0.1
43 <0.1
37 <0.1
45 <0.1
40 <0.1
40 <0.1
34 <0.1
44 <0.1
44 <0.1
41 <0.1
43 <0.1
40 <0.1 ---------44 <0.1 ---------
46 <0.1
45 <0.1
43.6 <0.1
44.7 0.1
48 <0.1
43 <0.1
44.6 <0.1
42.3 <0.1
46 <0.1
46.8 <0.1
47.3 <0.1
48.4 <0.1
54.1 <0.1
46.4 <0.1
46.4 <0.1
49.1 <0.1
50.4 <0.1
49.6 <0.1
48.3 <0.1
52.1 <0.1
47.7 <0.1
49.8 <0.1
51.5 <0.1
51.8 <0.1
44.7 <0.1
52 <0.1
53_s· <0.1
47.6 <0.1
47.9 <0.1
56 <0.1
54.9 <0.1
48.9 ;;0,1
50.2 <0.1
47.9 <0.1
54.4 <0.1
50.0 <0.1
49.0 <0.1
48.8 <0.1
49.3 <0.1
51.6 <0.1
48.8 <0.1
42.8 <0.1
51.2 <0.1
53.2 <0.1
43.8 <0.1
39.2 <0.1
42.2 0.10
45.0 <0.1
TABLE 1 (25 of 33)
Historic Summary Of Monitoring Well Analytical Results Up To The 3rd Quarter 2022
Chloroform Contamination Investigation
DUSA White Mesa Mill
1W4-24
(mtrate pumping well started
1/26/13)
Sampling Event Carbon Tetrachloride Chloroform Chloromethane
15 ua/L\ 170 ua/L\ 130 un/L\
2nd Qtr 6/27/2007 <1.0 2.6 <1.0
3rd Qtr 8/1512007 <1.0 2.2 <1.0
4thQtr 1011012007 <1.0 1.5 <1.0
1stQtr 3128/2008 <1.0 1.5 <1.0
2ndQtr 612512008 <1.0 1.4 <1.0
3rd Qtr 911012008 <1.0 2.9 <1.0
4th Qtr 10/1512008 NA #NIA NA
1111812008 <2.0 <2.0 <2.0
1stQtr 31412009 <1.0 1.4 <1.0
2nd Qtr 6/2312009 <1.0 1.5 <1.0
3rd Qtr 911412009 <1.0 1.4 <1.0
4th Qtr 12/1612009 <1.0 1.2 <1.0
1stQtr 3125/2010 <1.0 1.3 <1.0
2ndQtr 6/14/2010 <1.0 1.7 <1.0
3rdQtr 8/24/2010 <1.0 1.8 <1.0
4thQtr 10/15/2010 <1.0 1.4 <1.0
1stQtr 2/16/2011 <1.0 1.8 ·:;fo
2ndQtr 6/14/2011 <1.0 1.1 <1.0
3rdQtr 8/16/2011 <1.0 1.7 <1.0
4thQtr 11/15/2011 NA #NIA NA
1st Otr W ~~,~~~~~i <1.0 1.2 <1.0
<1.0 <1.0 <1.0
2nd Qtr ---616/2012 <1.0 --<1.0 ____ <1.0 ______
3rdQtr 8130/2012 <1.0 <1.0 <1.0
4th Qtr 10/3/2012 <1.0 1 <1.0
1st Qtr (3) 2/11/2013 <1.0 ---------1 <1.0 ______
2ndQtr 615/2013 <1.0 17.4 <1.0
3rdQtr 8130/2013 <1.0 21 .8 <1.0
4th Qtr 10129/2013 <1.0 32.5 <1.0
1stQtr 1127/2014 1.18 78.5 <1.0
2ndQtr 5/19/2014 <1.0 62.7 <1.0
3rd Qtr 8/11/2014 <1.0 76.3 <1.0
4th Qtr 10/2112014 <1.0 25.8 <1.0
1stQtr 3/9/2015 <1.0 49.2 <1.0
2ndQtr 6/8/2015 <1.0 4.28 <1.0
3rdQtr 8131/2015 <1.0 46.9 <1.0
4th Qtr 10119/2015 <1.0 25.3 <1.0
1stQtr 3/9/2016 <1.0 22.8 <1.0
2nd Qtr 5123/2016 <1.0 69.6 <1.0
3rdQtr 712512016 <1.0 17.8 <1.0
4th Qtr 10112/2016 <1.0 20.8 <1.0
1stQtr 3/8/2017 <1.0 18.3 <1.0
2ndQtr 6/1312017 <1.0 17.2 <1.0
3rdQtr 7126/2017 <1.0 17.8 <1.0
4th Qtr 10111/2017 <1.0 16.0 <1.0
OWMRC solit sam le <0.38 36.0 <0.60
1stQtr 3116/2018 <1.0 24.9 <1.0
2ndQtr 6114/2018 <1.0 49.2 <1.0
3rdQtr 8122/2018 <1.0 35 <1.0
4thQtr 1112812018 <1.0 21 <1.0
OWMRC soht samcle <5.0 60 <5.0
1si·atr 318/2019 <1.0 28.1 <1.0
2ndQtr 6/5/2019 <1.0 28.8 <1.0
3rdQtr 9/4/2019 <1.0 31.1 <1.0
4thQtr 12/10/2019 <1.0 43.3 <1.0
1stQtr 2/19/2020 <1.0 61.7 <1.0
2ndQtr 5127/2020 <1.0 49.4 <1.0
3rdQtr 9/4/2020 <1.0 63.8 <1.0
4thQtr 10128/2020 <1.0 72.6 <1.0
1stQtr 212312021 <1.0 96.2 3.6
2nd Qtr 6/912021 <1.0 41.9 <1.0
3rdQtr 8/2612021 <1.0 103 <1.0
4thQtr 12/112021 <1.0 112 <1.0
1stQtr 31912022 <1.0 114 <1.0
2nd Qtr 61812022 <1.0 124 <1.0
3rd Qtr 8130/2022 <1.0 88.9 <1.0
(1) voes were resampled because laboratory missed holding time.
(2) As of March 2012 both north and south wild life ponds no longer receiving water.
(3)Chloroform__pum_£J~ well started 1/26113 _______ .
NA = not analyzed
Shaded indicates concentrations exceeding GWQS.
J = Approximated value
Parameter
(GWQS)
Methylene Chloride
15 ua/Ll
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
NA
<2.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
NA
<1.0
<1.0
<1 .0 --------
<1.0
<1.0 <1.0 ________
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
1.3 J
<1.0
<1.0
<1.0
<1.0
<5.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
Chloride
No GWQS lma/Ll
770
791
692
740
834
1,180
1,130
#NIA
1,010
759
618
1 080
896
639
587
522
1,100
1,110
967
608
#N/A
373 -------355
489
405
1,260
916
998
1 030
809
1,020
1,150
1 050
944
1,290
788
909
989
771
1,180
1 010
1,090
1,080
1,230
895
1100
1,320
792
996
1,100
1 000
1,040
1,020
1,130
1 090
1,010
1,060
1,100
1 050
1,170
938
1,010
1140
980
944
868
Nitrate, Nitrate + Nitrite
110 ma/Ll
26.1
29
24.7
24.4
45.3
38.4
44.8
#NIA
30.5
30.4
30.7
28.3
33.1
30
31
31
31
35
34
35
#N/A
37 -----------37
37
38
35.9
23.7
33
35
31.6
35.0
31.5
35.7
34.6
31.8
25.3
29.6
29.1
24.2
34.4
31.9
41.3
39.9
40.0
31.7
32.0
44.9
33.6
33.8
38.4
34.0
39.3
33.2
36.4
33.8
37.1
41.7
39.1
35.9
41.9
48.0
26.7
43.6
36.2
35.0
32.0
I
TABLE 1 (26 of 33)
Historic Summary Of Monitoring Well Analytical Results Up To The 3rd Quarter 2022
Chloroform Contamination Investigation
DUSA White Mesa Mill
TW4-25 Parameter
(nitrate pumping well started (GWQS)
1126/13)
Sampling Event Carbon Tetrachloride Chloroform Chloromethane Methylene Chloride Chloride
(5 uo/Ll 170 un/L\ 130 un/Ll 15 ua/LI No GWQS Ima/LI
2nd Qtr 6/27/2007 <1.0 <1.0 <1.0 <1.0 395
3rdQtr 8/15/2007 <1 .0 2.2 <1 .0 <1.0 382
4th Ctr 10/10/2007 <1 .0 <1.0 <1.0 <1.0 358
1stQtr 3/28/2008 <1 .0 <1.0 <1.0 <1.0 374
2ndQtr 6/25/2008 <1.0 · <1.0 <1 .0 <1.0 344
3rd Ctr 9/1012008 <1.0 <1.0 <1.0 <1.0 333
4thQtr 10115/2008 NA #NIA NA NA 366
1111812008 <2.0 <2.0 <2.0 <2.0 #NIA
1stQtr 3/412009 <1.0 <1.0 <1.0 <1.0 3
2ndQtr 6/2312009 <1 .0 <1.0 <1.0 <1.0 328
3rdQtr 9114/2009 <1.0 <1.0 <1.0 <1.0 328
4thQtr 12/16/2009 <1.0 <1.0 <1.0 <1.0 371
1stQtr 3123/2010 <1.0 <1.0 <1.0 <1.0 296
2nd Qtr 6114/2010 <1 .0 <1.0 <1.0 <1.0 306
3rdQtr 8/1012010 <1.0 <1.0 <1.0 <1.0 250
4thOtr 10115/2010 <1.0 <1.0 <1.0 <1.0 312
1stQtr 2/16/2Cffi" <1.0 1.8 <1.0 <1.0 315
2ndQtr 512512011 <1.0 <1.0 <1 .0 <1.0 321
3rdQtr 8116/2011 <1.0 <1.0 <1 .0 <1.0 276
4thQtr 1111512011 <1 .0 <1.0 <1 .0 <1.0 294
1st Qtr (2) 111612012 <1.0 <1.0 <1 .0 <1.0 304
2nd Qtr 513112012 <1.0 ------------<1.0 ______ <1_0------287 <1.0
3rdQtr 91412012 <1.0 <1.0 <1 .0 <1.0 334
4th Qtr 1013/2012 <1 .0 _::_LQ_ ____ <1.0 <1.0 338
1st Qtr (3) 2/1112013 <1.0 -----<1.0 <t o ------<1.0 ----------------190
2nd Qtr 61512013 <1.0 <1.0 <1 .0 <1.0 136
3rdQtr 91412013 <1.0 <1.0 <1 .0 <1.0 119
4thOtr 1013112013 <1.0 <1.0 <1 .0 <1.0 88.6
1stQtr 112712014 <1.0 <1.0 <1 .0 <1.0 85.7
2nd Qtr 511912014 <1 .0 <1.0 <1.0 <1.0 51.1
3rdQtr 8/1112014 <1.0 <1.0 <1.0 <1.0 67
4thQtr 10/2112014 <1 .0 <1.0 <1.0 <1.0 58.1
1stOtr 3/912015 <1.0 <1.0 <1.0 <1.0 310
2nd Qtr 6/812015 <1.0 <1.0 <1.0 <1.0 58.3
3rdQtr 8131/2015 <1.0 <1.0 <1.0 <1.0 69.2
4th __ Qtr 10/19/2015 <1 .0 <1.0 <1.0 <1.0 93.7
1stOtr 3/912016 <1.0 <1.0 <1.0 <1.0 62.7
2ndQtr 5123/2016 <1.0 <1.0 <1.0 <1.0 75.5
3rdQtr 7125/2016 <1.0 <1.0 <1.0 <1.0 74.1
4thQtr 10112/2016 <1.0 <1.0 <1 .0 <1.0 59.8
1stQtr 3/812017 <1.0 1.15 <1 .0 <1.0 285
2ndQtr 611312017 <1.0 <1.0 <1 .0 <1.0 69.8
3rdQtr 712612017 <1.0 <1.0 <1.0 <1.0 70.1
4thOtr 10/11/2017 <1.0 <1.0 <1.0 <1.0 68.0
1stOtr 311212018 <1.0 1.15 <1.0 <1.0 10s"
2ndQtr 6/1412018 <1.0 <1.0 <1.0 <1.0 60.3
3rdQtr 8/2212018 <1.0 <1.0 <1.0 <1.0 69.1
4thOtr 11/28/2018 <1.0 <1.0 <1.0 <1.0 59.7
1stQtr 3/812019 <1.0 <1.0 <1.0 <1.0 65
2ndQtr 6/512019 <1.0 <1.0 <1.0 <1.0 59
3rdQtr 9/4/2019 <1.0 <1.0 <1.0 <1.0 58.1
4thOtr 12/10/2019 <1.0 <1.0 <1.0 <1.0 73.1
.,.siatr 2119/2020 <1.0 <1.0 <1.0 <1.0 86.0
2nd Qtr 512712020 <1.0 <1.0 <1.0 <1.0 76.8
3rdQtr 91412020 <1 .0 <1.0 <1.0 <1.0 67.3
4thOtr 10/28/2020 <1.0 <1.0 <1.0 <1.0 61.3
1stOtr 2/2312021 <1.0 <1.0 <1.0 <1.0 100
2ndQtr 6/9/2021 <1.0 <1.0 <1.0 <1.0 55.1
3rdQtr 812612021 <1.0 <1.0 1.34 <1.0 69.3
4th_Qtr 121112021 <1 .0 <1 .0 <1.0 <1.0 93.7
1stOtr 31912022 ·<io <1.0 <1.0 <1.0 10.:i·
2nd Qtr 61812022 <1 .0 <1.0 <1.0 <1.0 72.8
3rd Qtr 8/3012022 <1.0 <1.0 <1.0 <1.0 82.5
(1) voes were resampled because laboratory missed holding time.
(2) As of March 2012 both north and sbuth wild life ponds no longer receiving water.
(3) Chloroform pump1~ well started 1/26/13 _______ ,
NA = not analyzed
Shaded indicates concentrations exceeding GWOS.
Nitrate, Nitrate + Nitrite
110 ma/Ll
17.1
29
17
18.7
22.1
18.8
21.3
#NIA
15.3
15.3
3.3
14.2
14.4
16
14
15
15
16
16
16
16 -------16
17
17 ~--~-~-To4
5.24
5.69
6.1
2.16
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
2.23
1.14
0.810
0.634
0.639
0.821
0.548
0.841
0.607
0.851
0.994
1.64
3.43
1.57
0.793
0.978
1.8
0.88
1.51
TW4-26
Sampling Event
TABLE 1 (27 of 33)
Historic Summary Of Monitoring Well Analytical Results Up To The 3rd Quarter 2022
Chloroform Contamination Investigation
Parameter
IGWQSI
Carbon Tetrachloride
15uo/Ll
DUSA White Mesa Mill
Chloroform Chloromethane Methylene Chloride Chloride
170 uo/Ll 130 un/U 15 ua/Ll No GWQS Imo/LI
2nd Qtr 6/14/2010 <1.0 13 <1.0 <1.0 33
3rd Qtr 8/24/2010 <1.0 5.2 <1.0 <1.0 17
4th Qtr 10/15/2010 <1.0 5.4 <1.0 <1.0 22
1stQtr 2/16/2011 <1.0 2 <1.0 <1.0 30
2ndQtr 5/26/2011 <1.0 2.9 <1.0 <1.0 15
3rd Qtr 8/17/2011 <1.0 2.8 <1.0 <1.0 19
4thQtr 11/16/2011 NA #N/A NA NA 26
Nitrate, Nitrate + Nitrite
110 mo/LI
7.9
9.0
9.6
10.0
10.0
11 .0
10.0
. . .(11 12/7/2011 <1.0 5.2 <1.0 <1.0 #NIA #N/A
1stOtr (2) 1/18/2012 <1.0 7 <1.0 <1.0 17 11 .0 2ndQtr -6/6/2012 <1.0 ----4.1 <1.0 ------<1.0 ________ --------,9 12.0
3rd Qtr 9/11/2012 <1.0 4.9 <1.0 <1.0 19 9.0
~~~ g:; ~;~;~g\;1-:'-';'-'g'------+----':'-'.~+:-'-;"'g"-----l-":-";"'~------l------,-61,_,_~'l---------';=~""•~~
2nd Qtr 6/13/2013 <1.0 2.12 <1.0 <1.0 14.5 13.6
3rdQtr 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
1st Qtr 1/29/2014 <1.0 1.43 <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 Otr 10/28/2014 <1.0 2.45 <1.0 <1.0 14.6 12.3
1stQtr 3/12/2015 <1.0 2.37 <1.0 <1.0 14.4 14.4
2ndOtr 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 ·
1stOtr 3/16/2016 <1.0 1.8 <1.0 <1.0 13.7 16.9
2nd Otr 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 Otr 8/3/2017 <1.0 419 <1.0 <1.0 25.8 15.2
4th 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 <1.0 <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 1 070 <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
2ndOtr 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
4th Qtr 11/11/2020 <1.0 1160 <1.0 <1.0 36.3 11.9
1stQtr 3/24/2021 <1.0 1,030 <1.0 <1.0 38.9 11.3
2nd Qtr 6/17/2021 <1.0 1,020 <1.0 <1.0 34 14.2
3rd Qtr 9/23/2021 <1.0 927 <1.0 <1.0 36.5 12.1
4thQtr 12/9/2021 <1.0 993 <1.0 <1.0 34.9 8.15
1st Qtr 3/24/2022 <1.0 952 2.4 <1.0 33.0 10.9
2ndQtr 6/22/2022 <1.0 790 <1.0 <1.0 34 9.9
3rd Qtr 9/15/2022 <1.0 930 <1.0 <1.0 36.7 10.3
TW4-27
1stOtr(2) 1/18/2012 <1.0 9 <1.0 <1.0 11 24.0
2nd Qtr -6/13/2012 <1.0 --<1.0 <1.0 ---<1.0 ---------------,1 41.0
3rd Qtr 9/4/2012 <1.0 <1.0 <1.0 <1.0 21 37.0 ~~~ g:; 1~;~~g\;1-=:";~.~'------+=:-'-;"E~---+:Cc;"'•~~----f":"';°"'~------f-----~,~81'-'c_~'+---------'!;"-~•"'-I~
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
1stQtr 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 ~~~ g:; 1~;~:;~~;~ :; ~ 2\~ :; ~ :; ~ 26:i~~------~~~:~.~'-'
2nd Qtr 5/26/2016 <1.0 3.16 <1.0 <1.0 21.2 28.7
3rdOtr 8/3/2016 <1.0 2.78 <1.0 <1.0 27.1 21.8
4th Qtr 10/20/2016 <1.0 3.8 <1.0 <1.0 29.4 19.3
1st Qtr 3/15/2017 <1.0 4.33 <1.0 <1.0 28.3 22.2
2nd Qtr 6/15/2017 <1.0 5.65 <1.0 <1.0 27.9 23.8
3rd Qtr 8/2/2017 <1.0 6.05 <1.0 <1.0 29.5 20.0
l-'4e,th,cO,.te_r __ _,1'!'0/cc1,e0/~2~01'-'7+-<1-".~o------+----5~·.;91~<cc1"E.o'-----+<Cc1c,.0~· -----+------~26.31-_______ 2~1~.5=-.o 1stOtr 3/14/2018 <1.0 6.95 <1.0 <1.0 30:fi· 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
i.,4e,th,cO,.te_r __ _,1,,2/cc1-,21:ec2,c01,_,8'1"<1-"."-o-------l----'7"-.7'-+'<"1"'.o'-----+<'-'1"'.o"------+-------'28.21-_______ 2..,o"-.8"1
1st Qtr 3/16/2019 <1.0 6.54 <1.0 <1.0 26.2 21.5
2nd Qtr 6/13/2019 <1.0 8.24 <1.0 <1.0 28.6 22.3
3rd Qtr 9/11/2019 <1.0 7.58 <1.0 <1.0 25.3 21.2
4th Qtr 12/14/2019 <1.0 7.97 <1.0 <1.0 27.4 22.0
1st Qtr 3/18/2020 <1.0 8.04 <1.0 <1.0 27.6 23.6
2nd Qtr 6/11/2020 <1.0 7.92 <1.0 <1.0 28.0 21.5
3rd Qtr 9/18/2020 <1.0 5.62 <1.0 <1.0 26.2 25.2
4th Qtr 11/4/2020i.:<'-'1'-'.0'------+---.!.7'-".8+<::._1c;.0e._ ___ -l_;;<_c1."'0 _____ -l _____ __,2,.,,6c.,.8'l--------~1.:c64.7
1st Qtr 3/18/2021. <1.0 4.66 <1.0 <1.0 27.5 23.0
2nd Qtr 6/17/2021 <1.0 4.26 <1.0 <1.0 25.8 23.8
3rd Otr 9/15/2021 <1.0 3.81 <1.0 <1.0 21.7 21 .1
4th Qtr 12/8/2021 <1.0 4.08 <1.0 <1.0 26.4 24.9
1stOtr 3/23/2022 <1.0 3.3 <1.0 <1.0 22.7 21 .3
2nd Qtr 6/16/2022 <1.0 3.f <1.0 <1.0 22.3 20.0
3rd Qtr 9/14/2022 <1.0 4.3 <1.0 <1.0 23.2 16.9
( 1) voes were resampled because laboratory missed holding time.
(2) As of March 2012 both north and south wild life ponds no longer receiving water. _____ •
NA =-not analyzed
Shaded md1cates concentrations exceeding GWQS
TW4-28
Sampling Event
TABLE 1 (28 of 33)
Historic Summary Of Monitoring Well Analytical Results Up To The 3rd Quarter 2022
Chloroform Contamination Investigation
DUSA White Mesa Mill
Parameter
IGWQSl
Carbon Tetrachloride Chloroform Chloromethane Methylene Chloride Chloride
15 ua/Ll 170 ua/Ll 130 ua/Ll 15 ua/Ll No GWQS Ima/LI
2nd Qtr 6/19/2013 <1 .0 <1.0 <1.0 <1.0 44.6
3rdQtr 8/29/2013 <1.0 <1.0 <1.0 <1.0 45.3
4th Ctr 11/6/201 3 <1.0 <1 .0 <1.0 <1.0 45.3
1st Qtr 1/22/2014 <1.0 <1 .0 <1.0 <1.0 47.8
2nd Qtr 5/21/2014 <1.0 <1.0 <1.0 <1.0 45.7
3rd Qtr 8/13/2014 <1.0 <1.0 <1.0 <1.0 50
4th Qtr 10/23/2014 <1.0 <1.0 <1.0 <1.0 52.1
1stQtr 3/11/2015 <1.0 <1.0 <1.0 <1.0 52.2
2nd Qtr 6/10/2015 <1.0 <1.0 <1.0 <1.0 56.4
3rd Qtr 9/212015 <1.0 <1.0 <1.0 <1.0 61.4
4thQtr 10/21/2015 <1.0 <1.0 <1.0 <1.0 52.7
1st Ctr 3/15/2016 <1 .0 <1.0 <1.0 <1.0 61.6
Duplicate TW4-65 <1.0 <1.0 <1.0 <1.0 61.4
12nd Qtr 5/25/2016 <1.0 <1.0 <1.0 <1.0 67.1
3rd Qtr 7/27/2016 <1.0 <1.0 <1.0 <1.0 70.1
Duplicate TW4-65 <1.0 <1.0 <1.0 <1.0 70.9
f4th Qtr 10/19/2016 <1.0 <1.0 <1.0 <1.0 70.9
Duolicate 1W4-65 <1.0 <1.0 <1.0 <1.0 . 73.7
li°statr 3/14/2017 <1.0 <1.0 <1.0 <1.0 64.2
Duplicate TW4-65 <1.0 <1.0 <1.0 <1.0 66.4
2ndQtr 6/14/201 7 <1.0 <1.0 <1.0 <1.0 68.6
3rdQtr 7/27/2017 <1.0 <1.0 <1.0 <1.0 67.1
4th Ctr 10/10/201 7 <1.0 <1.0 <1.0 <1.0 57.4
1st Qtr 3/14/2018 <1.0 <1.0 <1.0 <1.0 65.0
2ndQtr 6/12/2018 <1.0 <1.0 <1.0 <1.0 55.7
Duplicate TW4-65 <1.0 <1.0 <1.0 <1.0 56.7
3rdQtr 8/29/2018 <1.0 <1.0 <1.0 <1.0 63.8
4thQtr 11/30/2018 <1.0 <1.0 <1.0 <t.0 52.4
1st Ctr 3/16/2019 <1.0 <1.0 <1.0 <1.0 51.7
2nd Qtr 6/13/2019 <1.0 <1.0 <1.0 <1.0 51.8
3rd Ctr 9/11/2019 <1.0 <1.0 <1.0 <1.0 49.0
4th Ctr 12/1212019 <1.0 <1.0 <1.0 <1.0 50.0
1st Ctr 3/17/2020 <1.0 <1.0 <1.0 <1.0 5ii
2nd Qtr 6/10/2020 <1.0 <1.0 <1.0 <1.0 49.8
3rd Qtr 9/17/2020 <1.0 <1.0 <1.0 <1.0 47.4
4th Qtr 11/4/2020 <1.0 <1.0 <1.0 <1.0 49.0
1stQtr 3/17/202i° <1.0 <1.0 <1.0 <1.0 51.8
2nd Qtr 6/15/2021 <1.0 <1.0 <1.0 <1.0 48.5
3rdQtr 9/15/2021 <1.0 <1.0 <1.0 <1.0 40.7
4thQtr 1217/2021 <1.0 <1.0 <1.0 <1.0 47.8
1st Ctr 3/1 5/2022 <1.0 <1.0 <1 .0 <1.0 38.8
2nd Qtr 6/15/2022 <1.0 <1.0 <1.0 <1.0 52.3
3rdQtr 9/13/2022 <1.0 <1.0 <1.0 <1.0 58.5
TW4-29
2nd Qtr 6/19/2013 <1.0 242 <1.0 <1.0 44.8
2nd Qtr 7/11/2013 <1.0 262 <1.0 <1.0 37.7
3rdQtr 9/26/2013 <1.0 246 <1.0 <1.0 41.4
4thQtr 11/13/2013 <1.0 260 <1.0 <1.0 42.5
1stQtr 215/2014 <1.0 258 <1.0 <1.0 14.9
2ndQtr 5/2212014 <1.0 262 <1 .0 <1.0 38.2
3rd Qtr 8/27/2014 <1.0 242 <1.0 <1.0 41
4thQtr 10/29/2014 <1.0 290 <1.0 <1.0 41
1stQtr 3/12/2015 <1.0 299 <1.0 <1.0 40.5
2nd Qtr 6/11/2015 <1.0 329 <1.0 <1.0 42.5
3rdQtr 9/3/2015 <1.0 276 <1.0 <1.0 47.3
4thQtr 10/29/2015 ~L9 631 <1.0 <1.0 39.8
1stQtr 3/17/2016 <1.0 335 <1 .0 <1.0 40.5
2ndQtr 6/8/2016 <1.0 366 <1.0 <1.0 42.9
3rdQtr 8/3/2016 <1.0 401 <1.0 <1.0 40.6
4th Ctr 10/26/2016 <1.0 392 <1.0 <1.0 44.2
·i°statr 3/16/2017 <1.0 446 <1.0 <1.0 41.5
2ndQtr 6/4/2017 <1.0 420 <1.0 <1.0 42
3rdQtr 8/4/2017 <1.0 466 <1.0 <1.0 42.9
4th Qtr 10/11/2017 <1.0 431 <1.0 <1.0 37.7
1stQtr 3/14/2018 <1.0 533 <1.0 <1.0 43.1
2nd Ctr 6/14/2018 <1.0 474 <1.0 <1.0 40.1
3rdQtr 8/29/2018 <1.0 454 <1.0 <1.0 45.9
4th Ctr 12113/2018 <1.0 521 <1.0 <1.0 40.9
1st Ctr 3/20/2019 <1.0 507 <1.0 <1.0 39.9
2nd Qtr 6/13/2019 <1.0 537 <1.0 <1.0 39.4
3rd Qtr 9/12/2019 <1.0 549 <1.0 <1.0 38
4th Ctr 12/18/2019 <1.0 630 <1.0 <1.0 44.8
1stQtr 3/18/2020 <1.0 652 <1.0 <1.0 41
2nd Qtr 6/12/2020 <1.0 686 <1.0 <1.0 42.2
3rdQtr 9/19/2020 <1.0 621 <1.0 <1.0 39.9
4thQtr 11/11/2020 <1.0 671 <1.0 <1.0 40.8
DWMRC sch! sample <10 670 <20 <20 42
1statr 3/24/2021 <1.0 577 <1.0 <1.0 44.:i°
2nd Ctr 6/17/2021 <1.0 543 <1.0 <1.0 40
3rd Ctr 9/23/2021 <1.0 602 <1.0 <1.0 40.1
4thQtr 1219/2021 <1.0 625 <1.0 <1.0 38.7
P.!-!Pl!~.ate TW4-75 <1.0 636 <1.0 <1.0 40
1stQtr 3/23/2022 <1.0 624 <1.0 <1.0 39.1
2ndQtr 6/22/2022 <1.0 398 <1.0 <1.0 41.5
3rdQtr 9/23/2021 <1.0 591 <1.0 <1.0 41.8
Ouolicate TW4-75 <1.0 591 <1.0 <1.0 42.0
H = Sample was analyzed be ond holding times and~ not be accureate concentration.
Shaded indicates concentrations exceeding GWQS
Nitrate, Nitrate + Nitrite
I10ma/Ll
14.9
17.3
16.2
16.9
16.5
14.2
16.5
19.0
19.0
17.8
18.7
34.0
32.6
29.0
31.3
35.6
25.5
25.4
24.4
27.9
26.0
24.8
24.8
17.2
19.0
18.7
16.0
17.7
17.2
15.0
10.2
9.48
9.87
9.55
8.36
7.76
8.68
9.09
8.08
7.60
7.80
15.0
16.2
4.60
3.52
4.18
4.11
4.63
3.52
3.40
3.64
4.14
2.95
2.19
2.74
2.92
2.51
2.44
2.40
2.24
2.26
2.35
2.45
2.44
2.67
2.52
2.50
2.67
2.56
2.55
2.58
3.10
3.18
2.90
3.27
0.75 H
3.09
3.59
3.29
2.39
1.91
3.10
2.9
2.80
2.76
TW4-30
Sampling Event
TABLE 1 (29 of 33)
Historic Summary Of Monitoring Well Analytical Results Up To The 3rd Quarter 2022
Chloroform Contamination Investigation
DUSA White Mesa Mill
Parameter
IGWQS)
Carbon Tetrachloride Chloroform Chloromethane Methylene Chloride Chloride
15 ua/Ll 170 ua/Ll 130 ua/LI 15 ua/Ll No GWQS Ima/LI
2nd Ctr 6/19/2013 <1.0 <1 .0 <1.0 <1.0 36
3rdQtr 9/26/2013 <1.0 <1 .0 <1.0 <1.0 36.3
4th Ctr 11/13/2013 <1 .0 <1 .0 <1.0 <1.0 35.9
1stQtr 1/23/2014 <1 .0 <1.0 <1.0 <1.0 36.9
2nd Qtr 5/22/2014 <1.0 <1.0 <1.0 <1.0 31.9
3rd Ctr 8/23/2014 <1 .0 <1.0 <1.0 <1 .0 38
4th Ctr 10/23/2014 <1.0 <1.0 <1.0 <1 .0 37.1
1st Ctr 3/11/2015 <1.0 1.65 <1.0 <1.0 38.3
2nd Qtr 6/11/2015 <1.0 2.25 <1.0 <1 .0 40.3
3rdQtr 9/3/2015 <1.0 3.27 <1.0 <1.0 44.2
4th Ctr 10/28/2015 <1 .0 3.48 <1.0 <1.0 37.8
1stQtr 3/17/2016 <1 .0 5.16 <1.0 <1.0 39.6
2nd Ctr 5/26/2016 <1 .0 7.38 <1.0 <1.0 40.2
3rdQtr 8/3/2016 <1 .0 6.79 <1.0 <1 .0 38.6
4th Ctr 10/20/2016 <1.0 8.69 <1.0 <1 .0 41.3
1st Ctr 3/15/2017 <1 .0 13.6 <1.0 <1 .0 37.7
2nd Qtr 6/15/2017 <1.0 15.2 <1.0 <1 .0 37.8
3rd Ctr 8/3/2017 <1 .0 15.7 <1.0 <1.0 39.8
4thQtr 10/10/2017 <1 .0 13.4 <1.0 <1.0 34.9
1st Ctr 3/15/2018 <1.0 16.4 <1.0 <1.0 41
2nd Qtr 6/13/2018 <1 .0 16.9 <1.0 <1.0 37.4
3rd Qtr 8/30/2018 <1 .0 19.8 <1.0 <1.0 44.1
4th Ctr 12/12/2018 <1.0 23.9 <1 .0 <1.0 35.5
1st Ctr 3ii°Sl2019 <1.0 25.3 <1 .0 <1.0 35.9
2nd Qtr 6/13/2019 <1 .0 31.5 <1.0 <1.0 27.2
3rd Qtr 9/11/2019 <1.0 34.8 <1.0 <1.0 34.5
4thQtr 12/18/2019 <1.0 44.9 <1 .0 <1.0 39.1
1stQtr 3/17/2020 <1.0 53.1 <1 .0 <1.0 37.5
2nd Ctr 6/12/2020 <1 .0 65.4 <1 .0 <1.0 38.6
3rd Ctr 9/18/2020 <1.0 67.7 <1 .0 <1.0 35
4th Ctr 11/11/2020 <1.0 82.8 <1 .0 <1.0 37.1
OWMRC.s lit samote <10 66 <20 <20 39
1stQtr 3/17/2021 <1.0 74.8 ·;;;io <1.0 37.6
2ndQtr 6/17/2021 <1.0 78.7 <1.0 <1.0 38.3
3rd Ctr 9/22/2021 <1.0 78.2 <1 .0 <1.0 23.5
4th Ctr 12/812021 <1.0 81.2 <1 .0 <1.0 37.9
1stQtr 3/23/2022 <1.0 73.6 <1 .0 <1.0 35.1
2ndQtr 6/22/2022 <1.0 70.8 <1.0 <1.0 41.3
3rd Ctr 9/14/2022 <1.0 68.8 <1.0 <1.0 30.5
TW4-31
2ndQtr 6/19/2013 <1.0 <1.0 <1 .0 <1.0 28.4
3rdQtr 9/5/2013 <1.0 <1.0 <1 .0 <1.0 29.4
4th Ctr 11/7/2013 <1.0 <1.0 <1.0 <1.0 28
1stQtr 1/23/2014 <1.0 <1.0 <1.0 <1.0 28.5
2ndQtr 5/21/2014 <1.0 <1.0 <1.0 <1.0 26.3
3rdQtr 8/13/2014 <1.0 <1.0 <1.0 <1.0 30
4th __ Qtr 10/28/2014 <1.0 <1.0 <1.0 <1.0 37.1
1stQtr 3/11/2015 <1.0 <1.0 <1 .0 <1.0 30.6
2ndQtr 6/10/2015 <1.0 <1.0 <1 .0 <1.0 31.1
3rd Ctr 9/2/2015 <1.0 <1.0 <1.0 <1.0 30.4
4th Ctr 10/21/2015 <1.0 <1.0 <1 .0 <1.0 29.1
1st Ctr 3/11/2016 <1.0 <1.0 <1.0 <1.0 31.5
2nd Ctr 5/25/2016 <1.0 <1.0 <1.0 <1.0 32.5
3rd Ctr 7/28/2016 <1.0 <1.0 <1.0 <1.0 30.6
4th Ctr 10/20/2016 <1.0 <1.0 <1.0 <1.0 34
1st Ctr 3/15/2017 <1.0 <1.0 <1 .0 <1.0 31.3
2nd Ctr 6/15/2017 <1.0 <1.0 <1.0 <1.0 33.4
3rd Ctr 8/2/2017 <1.0 <1.0 <1 .0 <1.0 33
4th Ctr 10/10/2017 <1.0 <1.0 <1 .0 <1.0 30.9
1st Ctr 3/14/2018 <1.0 <1.0 <1.0 <1.0 38.8
2nd Qtr 6/12/2018 <1.0 <1.0 <1.0 <1.0 34.4
3rd Ctr 8/29/2018 <1.0 <1.0 <1.0 <1.0 40.3
4th Ctr 12/12/2018 <1.0 <1.0 <1.0 <1.0 35.2
1stQtr 3/16/2019 <1.0 <1.0 <1.0 <1.0 35
2nd Qtr 6/13/2019 <1.0 <1.0 <1.0 <1.0 36.9
3rd Ctr 9/11/2019 <1.0 <1.0 <1.0 <1.0 35.8
4th Ctr 12/14/2019 <1.0 <1.0 <1.0 <1.0 40.6
1st Ctr 3/17/2020 <1.0 <1.0 <1.0 <1.0 38.2
2nd Qtr 6/12/2020 <1.0 <1.0 <1.0 <1.0 36.7
3rd Ctr 9/17/2020 <1.0 <1.0 <1.0 <1.0 36.5
4th Ctr 11/4/2020 <1.0 <1.0 <1.0 <1.0 36.4
1st Ctr 3/17/2021 <1.0 <1.0 -<1.0 <1.0 40.3
2nd Ctr 6/16/2021 <1.0 <1.0 <1.0 <1.0 37.9
3rd Ctr 9/15/2021 <1.0 <1.0 <1.0 <1.0 31.2
4th Ctr 12/8/2021 <1.0 <1.0 <1.0 <1.0 40.3
1st Ctr 3/16/2022 <1.0 <1.0 <1.0 <1.0 34.3
2nd Qtr 6/16/2022 <1.0 <1.0 <1 .0 <1.0 35.5
3rdQtr 9/13/2022 <1.0 <1.0 <1.0 <1.0 40
Shaded indicates concentrations exceeding GWQS
H = Sample was analyzed beyond holding times and may not be accureate concentration.
Nitrate, Nitrate + Nitrite
110 ma/Ll
0.95
0.952
1.24
1.36
1.44
1.5
1.84
2.15
1.75
1.75
1.86
2.74
2.04
2.32
2.51
2.70
2.95
3.11
2.58
3.63
3.93
3.79
3.70
4.08
4.13
3.79
3.62
3.85
3.69
3.49
3.64
<0.5 H
3.54
4.19
2.60
3.14
3.0
2.8
2.61
1.3
1.1
1.33
1.32
1.22
1.1
1.84
1.33
1.19
0.916
0.953
1.84
1.36
1.41
1.14
1.19
1.21
1.11
1.04
0.916
0.948
0.710
0.766
0.754
0.713
0.61
0.58
0.572
0.569
0.51
0.501
0.501
0.451
0.46
0.339
0.4
0.41
0.396
TW4-32
Sampling Event
TABLE 1 (30 of 33)
Historic Summary Of Monitoring Well Analytical Results Up To The 3rd Quarter 2022
Chloroform Contamination Investigation
DUSA White Mesa Mill
Parameter
IGWQSl
Carbon Tetrachloride Chloroform Chloromethane Methylene Chloride Chloride
(5 uQ/LI (70 uo/Ll 130 uo/Ll 15 un/Ll No GWQS lmn/Ll
4lhQlr 11/14/2013 <1.0 <1.0 <1.0 <1.0 52.1
1s1Qtr 1/2212014 <1.0 <1.0 <1.0· <1.0 54.5
2nd Qtr 5/21/2014 <1.0 <1.0 <1.0 <1.0 54.9
3rd Qtr 8/13/2014 <1.0 <1.0 <1.0 <1.0 64
4thQtr 10/2312014 <1.0 <1.0 <1.0 <1.0 62.6
1s1Qtr 3/11/2015 <1.0 <1.0 <1.0 <1.0 64.2
Duplicate TW4-65 <1.0 <1.0 <1.0 <1.0 65.9
2nd Qtr 6/10/2015 <1.0 <1.0 <1.0 <1.0 62.7
3rdQtr 9/2/2015 <1.0 <1.0 <1.0 <1.0 59.6
4thQtr 10/21/2015 <1.0 <1.0 <1.0 <1.0 55. 1
1s1Qtr 3/15/2016 <1.0 <1.0 <1.0 <1.0 64.2
2nd Qtr 5/25/2016 <1.0 <1.0 <1.0 <1.0 71.8
3rd Qtr 7/28/2016 <1.0 <1.0 <1.0 <1.0 64.4
4thQlr 10/19/2016 <1.0 <1.0 <1.0 <1.0 66
1s1Qtr 3/17/2017 <1.0 <1.0 <1.0 <1.0 62.8
2nd Qtr 6/15/2017 <1.0 <1.0 <1.0 <1.0 53.5
3rd Qtr 8/2/2017 <1.0 <1.0 <1.0 <1.0 65.8
4th Qtr 10/10/2017 <1.0 <1.0 <1.0 <1.0 65.8
1s1Qtr 3/14/2018 <1.0 <1.0 <1.0 <1.0 65.4
2nd Qtr 6/1212018 <1.0 <1.0 <1.0 <1.0 59.2
3rdQtr 8/29/2018 <1.0 <1.0 <1.0 <1.0 68.1
4lhQlr 11/30/2018 <1.0 <1.0 <1.0 <1.0 57.5
1s1Qtr 3/16/2019 ·<·1.0 <1.0 <1.0 <1.0 57.5
2nd Qtr 9/11/2019 <1.0 <1.0 <1.0 <1.0 60.1
3rdQtr 9/11/2019 <1.0 <1.0 <1.0 <1.0 55.0
4thQlr 12/14/2019 <1.0 <1.0 <1.0 <1.0 64.7
1stQtr 3/17/2020 <1.0 <1.0 <1.0 <1.0 59.7
2nd Qtr 6/10/2020 <1.0 <1.0 <1.0 <1.0 57.0
3rdQtr 9/17/2020 <1.0 <1.0 <1.0 <1.0 50.8
4thQtr 11/4/2020 <1.0 <1.0 <1.0 <1.0 53.7
1s1Qtr 3/17/2021 <1.0 <1.0 <1.0 <1.0 60.5
2nd Qtr 6/15/2021 <1.0 <1.0 <1.0 <1.0 40.4
3rd Qtr 9/15/2021 <1.0 <1.0 <1.0 <1.0 46.1
4thQlr 12/7/2021 <1.0 <1.0 <1.0 <1.0 55.0
1stQtr 3/16/2022 <1.0 <1.0 <1.0 <1.0 48.0
2nd Qtr 6/15/2022 <1.0 <1.0 <1.0 <1.0 49.4
3rdQtr 9/13/2022 <1.0 <1.0 <1.0 <1.0 51.8
Duplicate TW4-65 <1.0 <1.0 <1.0 <1.0 53.6
TW4-33
4lhQlr 11/14/2013 <1.0 126 <1.0 <1.0 47.2
1s1Qtr 1/30/2014 <1.0 124 <1.0 <1.0 43_5·
2nd Qtr 5/2212014 <1.0 121 <1.0 <1.0 46.8
3rd Qtr 8/27/2014 <1.0 104 <1.0 <1.0 43
4th Qtr 10/29/2014 <1.0 124 <1,0 <1.0 44.2
1stQtr 3/12/2015 <1.0 134 <1.0 <1.0 44.2
2nd Qtr 6/11/2015 <1.0 127 <1.0 <1.0 46.6
3rd Qtr 9/3/2015 <1.0 123 <1.0 <1.0 53.3
4thQlr 10/29/2015 <1.0 129 <1.0 <1.0 44.5
1s1Qtr 3/17/2016 <·1.0 122 <1.0 <1.0 46.2
2nd Qtr 6/8/2016 <1.0 96.1 <1.0 <1.0 49.7
3rdQtr 8/4/2016 <1.0 121 <1.0 <1.0 48.5
4thQtr 10/26/2016 <1.0 109 <1.0 <1.0 52.4
1s1Qtr 3/17/2017 <1.0 90.7 <1.0 <1.0 49.0
2nd Qtr 6/20/2017 <1.0 103 <1.0 <1.0 49.2
3rdQtr 8/312017 <1.0 127 <1.0 <1.0 46.9
4thQtr 10/11/2017 <1.0 97.1 <1.0 <1.0 42.5
1sIQtr 3/15/2018 <1.0 128 <1.0 <1.0 492
2ndQtr 6/13/2018 <1.0 87.8 <1.0 <1.0 44.0
3rdQtr 9/5/2018 <1.0 113 <1.0 <1.0 50.0
4lhQlr 12113/2018 <1.0 141 <1.0 <1.0 43.2
1sIQtr 3/20/2019 <1.0 86.2 <1.0 <1.0 47.:i"
2ndQtr 6/19/2019 <1.0 121 <1.0 <1.0 43.4
3rdQtr 9/12/2019 <1.0 101 <1.0 <1.0 41 .1
4thQtr 12/18/2019 <1.0 117 <1.0 <1.0 48.8
1stQtr 3/18/2020 <1.0 93.7 <1.0 <1.0 45.3
2ndQtr 6/10/2020 <1.0 90.1 <1.0 <1.0 48.9
3rdQtr 9/18/2020 <1.0 84.9 <1.0 <1.0 51 .0
4thQtr 11/11/2020 <1.0 80.6 <1.0 <1.0 51.5
OWMRC st lit sample <10 68 <20 <20 54
1sIQtr 3/18/2021 <1.0 64.9 <1.0 ~io 55.6
2ndQtr 6/17/2021 <1.0 63.9 <1.0 <1.0 54.7
3rdQtr 9/22/2021 <1.0 60.2 <1.0 <1.0 42.5
4lhQtr 12/8/2021 <1.0 68.9 <1.0 <1.0 53.8
1sIQtr 3/23/2022 <1.0 53.1 <1.0 <1.0 51.4
2nd Qtr 6/22/2022 <1.0 58.7 <1.0 <1.0 56.7
3rd Qtr 9/14/2022 <1.0 53.9 <1.0 <1.0 42.2
Shaded md1cates concentrations exceedmg GWQS
H = Sample was analyzed beyond holding times and may not be accureate concentration.
Nitrate, Nitrate + Nitrite
110mn/L\
4.26
5.11
5.63
4.2
2.14
2.46
2.25
1.21
5.09
1.19
4.48
3.16
3.44
2.87
2.82
2.37
2.47
2.47
2.94
2.51
2.56
2.50
2.15
2.18
1.84
1.89
1.97
2.19
1.58
1.74
1.80
2.31
1.57
1.34
1.80
1.20
1.59
1.81
1.82
2.56
1.63
1.50
2.22
1.91
1.62
1.64
1.92
2.13
2.06
2.32
2.36
2.11
2.34
2.04
2.09
1.94
2.13
1.82
2.01
2.00
2.16
1.61
1.86
2.44
3.26
3.58
3.71
0.12 H
4.62
6.25
4.33
4.65
3.80
3.70 , 3.90
TW4--34 Sampling Event
TABLE 1 (31 of 33)
Historic Summary Of Monitoring Well Analytical Results Up To The 3rd Quarter 2022
Chloroform Contamination Investigation
DUSA White Mesa Mill
4th Qtr 11/14/2013 <1.0 1.64 1st Qtr 1/23/2014 <1.0 1.93 2rici at, ·· · ·· · · 512212014 •1 .o ·· · · i .s9 3rd afr . Bi13t2014 <1 ci . 1 io
4th atr 1oi2912014 <1:0,------P.~--+~'----+'-~-----+-----~ 1---------"1:-"16,,., 1stQtr 3/11/2015 <1.0 1.21 2riei air . . 61111201s <1:0 . . .. . .. . itiiiiii
:i,eiatr 9iii:2015 <1.0 o.458
4th atr 1012112"'0=-=1"'51-'<':-1',!.o'------F."=----+:~----+'-'-"i------+------~'+------->o.368 "fsi Qtr 3/16/2016 <1.0 6'.925 2nci at, · · ·· ·· · · · s,25i:fo15 •1 o · · · · ·· ·· o.6()5
3rd afr 8/3t:fo1ii <{ci O 726 4th atr ···10i201fofo <1:0 0.612 1st Qtr 3/15/2017 <1.0 0.674 2ridair ····· ··· 6/1512011 :.1:0 · ······· ii:fr,
3rdQtr · · · · · 8/2/2017 <1.0 ·· 0.733
4th atr 10/1012011 •1.0 ii.ii4
Duplicate.TW4-65 <1.0 0.784 1st Qtr 3/14/2018 <1.0 0.737 :iriciair 6/13/2018 <1 o o 877 3rd Qtr 8129/2018 <1.0 0.736
4thQtr. 12i1faci1Bi-:•..ci.,,,o_· _____ --i-.:=-----1-'-""------l-='--------l-------"'=-------'0.889 1.s!Qtr. 3/16/2019 <1.0 0.859 i;ii:\ifo19 <1.0 .... 0.994
9/11i2Cl19 <1.0 0.934 12/14/2019 <1:0 <1.0 <1.0 · 101 , stQtr 3/17/2020 <1.0 <1.0 <1.0 1.090 2rid afr 6/10,2020 <1 :o •iii · · · · · · · •i:o · i 2<ici
3rd atr . !i,1112020 •1 :o <1.o <i:ii ii 978 4th ciir 111-ii2ci2ci •1.0 <1 o <1.0 i .ci4 1st Qtr 3/17/2021 <1.0 <1.0 <1.0 1.09 2iiciai, · shsi:20:ii •iil · .... "ff :.:10 1oa 3rd air 9/15i:fo:i1 <i.o .. <1:0 . 1"1
4th Qtr 12/8/2021 <1 O <i:ci 1 :02 1st Qtr 3/16/2022 <1.0 1.0
:irid atr a/1512022 •1 ii 1:0 3rd Qtr 9/1412022 <1.6 6:taa
TW4-35 3rd ciir ·· ·· ·· ·· · · · si2ii2ci14 <i O · ·· · · · 0.2
4th air ioi2s,fo14 •1 a · o:isi 1stQtr 3/11/2015 <1.0 0.436 2ri,fotr ai1oi:foi5 <i o o 452 :i,ciatr · 9i:i1:1ois :.1:0 o.304 4ihai,. 1012512015 <1.o o.419 1st Qtr 3/16/2016 <1.0 0.521 2ric1 afr . . ii1261201s •1 o iiiia1 3rd air ·· ·· ·· ·· ·· · · a,:ii:fo15 •1.0· ·· ·· ·· · o.7:i:i 4th Qtr ......... 10/:20/2016 <1:Cl o:s2s
1st Qtr 3/15/2017 <1.0 0.673 2rici at, ai15120f1 •i:o ()699 :ii~ i;i"i, . iii:i1foi1 <1 ci .. ()670 4th Qtr . 1oi1iii:z617 <1.0 0.651 1stQtr 3/14/2018 <1.0 0.740
:ind atr 6'1312018 <1:0 ii:6s:i 3rd air · ·· ·· ·· · · ai:ioi:i01s :c1.o · · · · · ·· ·· · o s2i 4th air. 1211212oia <1 o . . .. .. .. .. 0559
·1st Qtr 3/16/2019 <1.0 0.574 2rici at,···· · ·· sifai2019 •1 o · o.6fo
:ird air · ·· !iH1,20iil :c1 :o o 5:is 4ti1air . ·12i1-ii:201s <1.0. . 6.s2-i
1st air . 3/17/2020 <1.0 0.595 2neiair 611112020 <1.0 . 0699 3rd air 9111i:fo20 :Ci.il · o.i6ci -iih air i 11412020 :.1 o ii 1se 1st Qtr 3/17/2021 <1.0 0.991. 2nd atr .. .. 6116i2021 •1.0 . . .. . i:ci1
3rd air · · · ·· ·· ·· · !iiis,2021 •1 :o 1 ::z 4tii air 12,si202i •1.0 · · · ·· ·· · · ·· ·· 1.230
1st Qtr 3/22/2022 <1.0 1.3 :iridatr 6/16/2022 <1 :o 1.6 3ri:tair · · ··· · sii.\i2022 •i.o · · · · · · 1.s1
TW4--3 3rd atr &27/2014 <1.0 4th air · · 1oi2:ii2014 •i .o 1st Qtr 3/11/2015 <1.0 2nciai, ai10,2015 :c10 3rdatr 9/3i2015 <1.0 -iih air 10121,2015 •i.o 1stQtr 3/11/2016 <1.0 2riciat, s,2612016 •1 :a 3rd atr 7/28/2016 <1 :o 4th air . . . .. . 1012cii201s <1.0
Du Ucate TW4•70 <1.0 ·1;;1 Qtr 3/15/2017 <1.0
2ndatr 6/15i2017 <1.0 :iici air· ·········· · ai:212011 :.1:0
4th ciir 1oiioi201i~<c,.1,,,.o_·· ··------1· 1st Qtr 3/14/2018 <1.0 2ndQtr 6/12/2018 <1:0
<0:1 <0.1 <o:,·
<0.1 <0.1 <0.1
<Q.1 <0.1 . <Qi
<0.1 <0.1 <0.1 . <Ci
<01 0.104
3rd air · ·· · ·· ·· · ai2iii201s •i.o ·· ·· ·· ·· · •L
4th air · 12112,2oisi-:•"-1.,,,o_·· -------i-.:=-----1="------1-="--------1-------" 1st Qtr 3/16/2019 <1.0 < 2ricfot, · 61iiii20111 :.1:0 :.1:0 < :ird atr ···· · ·· ·· ·· iiH1,201il .1:0 · ·· <1.0 ·· ·· ·· ·· ·· ·· •i:o < 4th air .. 12ii-ii2ci19 <i.o <io ............ •1.0
1st Qtr 3/17/2020 <1.0 .~.1 ... 9.. <1.0 2nd air s/1112020 <1 :o .... .. .. .. .. . <i:O
3rd air s11ii202ci <i.o •1.0 4th ai, iii412020 .1:0 ··· · ··· · · .,:·o
1st Qtr 3/17/2021 <1.0 <1.0 2nd ai, 611cii:fo21 •fo •1.0 :ird air · · ·· · siis,20:11 .1:o •i :o 4th air 1:iJiii:io:ii <i.o . . <1.0,...· -----1 1st Qtr 3/16/2022 <1.0 <1.0 2nd Qtr 6i15i2022 <fo . <i:ci 3ri:t air sii:\i2022 :,:1 0 · · · · · :c1:o
Shaded indicates concentrations exceeding GWQS.
<0.1 ""<(i"1 ......... <0.1
···•qj
<0.1 <(i1 <(,: i
=------1-------'='l---------"•01 qi
<0.1 <0.1
TW4-37
(chloroform pumping well
6/9/15)
Sampling Event
2nd Qtr 6/8/2015
3rdQtr 9/3/2015
4thQtr 10/19/2015
1stQtr 3/9/2016
2nd Qtr 5/23/2016
3rdQtr 7/25/2016
4thQtr 10/12/2016
1stQtr 3/8/2017
2nd Qtr 6/15/2017
3rdQtr 7/26/2017
4thOtr 10/11/2017
1stOtr 3/12/2018
2nd Qtr 6/8/2018
3rdQtr 8/22/2018
4thOtr 11/28/2018
1stQtr 3/8/2019
2nd Otr 6/5/2019
3rd Qtr 9/4/2019
4thQtr 12/10/2019
1stQtr 2/19/2020
2nd Qtr 5/27/2020
3rdOtr 9/4/2020
4thOtr 10/28/2020
1stQtr 2/23/2021
2nd Qtr 6/9/2021
3rdQtr 8/24/2021
4thQtr 12/1/2021
1stQtr 3/9/2022
2nd Qtr 6/8/2022
3rdQtr 8/30/2022
TW4-38
4thQtr 11/10/2016
1stOtr 3/15/2017
2ndQtr 6/15/2017
3rdQtr 8/2/2017
4thOtr 10/10/2017
1stQtr 3/14/2018
2ndOtr 6/13/2018
3rdQtr 8/30/2018
4thQtr 12/12/2018
1st0tr 3/16/2019
2ndQtr 6/13/2019
Duplicate TW4-70
3rdOtr 9/11/2019
4thQtr 12/14/2019
1stQtr 3/17/2020
2ndOtr 6/11/2020
3rdQtr 9/18/2020
4thQtr 11/4/2020
1stOtr 3/18/2021
2nd Qtr 6/16/2021
Duplicate TW4-70
3rdQtr 9/15/2021
4thOtr 12/8/2021
1stOtr 3/22/2022
2nd Qtr 6/16/2022
3rd Qtr 9/14/2022
TW4-39(ctll0f0foon pumping-II
(1112016)
4thOtr 11/11/2016
1stQtr 3/8/2017
2nd Qtr 6/15/2017
3rdQtr 7/26/2017
4thQtr 10/10/2017
1stOtr 3/12/2018
2nd Qtr 6/8/2018
3rdOtr 8/22/2018
4th .. Otr 11/28/2018
1stQtr 3/8/2019
2ndQtr 6/5/2019
3rdQtr 9/4/2019
4thQtr 12/10/2019
1stQtr 2/19/2020
2ndQtr 5/27/2020
3rdOtr 9/18/2020
4thOtr 10/28/2020
1stQtr 2/23/2021
2ndQtr 6/9/2021
3rdQtr 8/24/2021
4thQtr 12/1/2021
1stQtr 3/9/2022
2nd Qtr 6/8/2022
3rdQtr 8/30/2022
TABLE 1 (32 of 33)
Historic Summary Of Monitoring Well Analytical Results Up To The 3rd Quarter 2022
Chloroform Contamination Investigation
DUSA White Mesa Mill
Parameter
(GWQS)
Carbon Tetrachloride Chloroform Chloromethane Methylene Chloride Chloride
15 ua/LI 170 ua/LI /30 un/LI 15 ua/LI No GWQS Imo/LI
18.2 30,200 15.7 1.94 345
16.6 19,100 13.7 1.04 374
12.5 19 500 9.38 1.17 399
15.8 17,500 3.57 1.34 332
14.4 16,200 3.57 1.17 389
16.7 15,900 <1.0 <1.0 294
16.3 16 400 <1.0 <1.0 304
15.4 18,000 3.57 1.34 305
16.2 15,800 <1.0 <1.0 281
15.1 15,000 <1.0 <1.0 277
12.6 15 500 2.47 <1.0 255
12.8 12,900 1.14 <1.0 263
10.6 14,400 <1.0 <1.0 275
12.1 14,100 6.2 <1.0 387
11.3 15 200 19.8 <1.0 264
13.8 13,300 1.24 <1.0 209
14.6 16,200 <1.0 <1.0 250
10.7 11,900 1.9 <1.0 228
8.81 13100 3.12 <1.0 220
8.53 12,000 12.3 <1.0 236
11.8 11,700 1.44 <1.00 321
9.62 13,800 <1.0 <1.0 273
6.52 10 300 29.4 <1.0 254
<1.0 9,380 <1.0 <1.0 242
8.46 13,000 1.98 <1.00 176
7.65 10,200 <1.0 <1.0 220
11.5 14 800 6.7 5.05 410
12.2 13,700 <1.0 <1.0 414
8.2 46,800 12 <1.0 276
5.4 11 600 2.4 <1.0 243
<1.0 <1.0 <1.0 <1.0 40
<1.0 <1.0 <1.0 <1.0 35.7
<1.0 <1.0 <1.0 <1.0 36.2
<1.0 <1.0 <1.0 <1.0 36.9
<1.0 <1.0 <1.0 <1.0 31.3
<1.0 <1.0 <1.0 <1.0 36.5
<1.0 <1.0 <1.0 <1.0 33.1
<1.0 <1.0 <1.0 <1.0 39.2
<1.0 <1.0 <1.0 <1.0 35.0
<1.0 <1.0 <1.0 <1.0 33.5
<1.0 <1.0 <1.0 <1.0 33.7
<1.0 <1.0 <1.0 <1.0 35.3
<1.0 <1.0 <1.0 <1.0 31.6
<1.0 <1.0 <1.0 <1.0 36
<1.0 <1.0 <1.0 <1.0 33.4
<1.0 <1.0 <1.0 <1.0 34.9
<1.0 <1.0 <1.0 <1.0 34.7
<1.0 <1.0 <1.0 <1.0 35.1
<1.0 <1.0 <1.0 <1.0 37.2
<1.0 <1.0 <1.0 <1.0 37.7
<1.0 <1.0 <1.0 <1.0 35.7
<1.0 <1.0 <1.0 <1.0 32.1
<1.0 <1.0 <1.0 <1.0 35.8
<1.0 <1.0 <1.0 <1.0 32.7
<1.0 <1.0 <1.0 <1.0 37.3
<1.0 <1.0 <1.0 <1.0 32.9
<1.0 2 800 <1 .0 <1.0 68.9
8.15 6,460 <1.0 1.35 130
8.2 5,560 <1.0 1.31 120
14.4 10,000 <1.0 1.5 132
<1.0 552 <1.0 <1.0 73.5
3.1 2,870 <1.0 <1.0 118
7.94 7,160 <1.0 <1.0 107
12.5 8,180 2.33 <1.0 110
6.08 6 520 2.33 <1.0 123
1.2 885 <1.0 <1.0 49
11.6 8,640 <1.0 <1.0 114
5.71 4,240 <1.0 <1.0 48.2
1.14 1 650 <1.0 <1.0 74.7
<1.0 812 <1.0 <1.0 76.5
7.56 5,870 <1.0 <1.0 88 51 8.18 5,960 <1.0 <1.0 63.2
<1.0 648 1.19 <1.0 83.2
<1.0 2,970 <1.0 <1.0 53.ol
7.56 2,490 <1.0 <1.0 123
<1.0 858 <1.0 <1.0 78 71
<1.0 776 <1.0 <1.0 82.4
<1.0 724 <1.0 <1.0 75.21
1.4 982 <1.0 <1.0 ~~~I <1.0 843 <1.0 <1.0
Shaded indicates concentrations exceeding GWQS.
Nitrate, Nitrate + Nitrite
110 mo/LI
35.2
32.4
34.6
28.4
27.9
33.4
26.1
32.3
31.2
30.5
30.6
30.0
28.6
25.3
27.3
30.1
31.2
25.8
25.5
28.3
28.3
29.5
28.7
26.9
26.6
25.8
31.3
29.8
28.0
26.6
11.2
10.6
10.8
10.1
10.3
9.34
9.48
7.77
8.48
8.96
8.53
9.52
7.61
7.51
8.11
9.00
7.35
7.72
8.24
9.59
9.05
8.04
8.02
7.7
7.9
7.57
20.7
6.44
6.25
7.74
2.65
3.33
4.84
6.05
6.39
2.08
8.45
1.75
0.95
0.792
5.01
2.69
7.03
2.12
12.0
2.70
2.33
2.9
9.0
3.72
TW4-40
(chloroform pumping well
5/2019)
Sampling Event
TABLE 1 (33 of 33)
Historic Summary Of Monitoring Well Analytical Results Up To The 3rd Quarter 2022
Chloroform Contamination Investigation
OUSA White Mesa Mill
Parameter
(GWQS)
Carbon Tetrachloride Chloroform Chloromethane Methylene Chloride Chloride
(5 ug/L) (70 ug/L) (30 ug/L) (5 ug/L) No GWQS (mg/L)
1stQtr 3/21/2018 <1.0 248 <1.0 <1.0 35.7
2nd Qtr 6/13/2018 <1.0 131 <1.0 <1.0 31.6
3rd Qtr 9/5/2018 <1.0 116 <1.0 <1.0 37.6
4thQtr 12/12/2018 <1.0 118 <1.0 <1.0 29.9
_qupl)cat~ TW4-75 <1.0 119 <1.0 <1.0 32.3
(2)1st Ctr 3/20/2019 <1.0 111 <1.0 <1.0 30.9
2nd Qtr 6/5/2019 <1.0 ~----263 <1.0 ______ <1.0 --35.6
3rd Qtr 91412019 <1.0 380 <1.0 <1.0 35.9
4thQtr 1211012019 <1.0 314 <1.0 <1.0 36.7
1stQtr 2119/2020 <1.0 364 <1.0 <1.0 38.5
2ndQtr 512712020 <1.0 367 <1.0 <1.0 36.5
3rdQtr 91412020 <1.0 333 <1.0 <1.0 34.2
4thQtr 1012812020 <1.0 264 <1.0 <1.0 34.6
1stQtr 2/2312021 <1.0 436 3.51 <1.0 36.0
2nd Qtr 61912021 <1.0 343 <1.0 <1.0 27.5
3rd Ctr 812412021 <1.0 301 1.32 <1.0 31 .8
4th Ctr 121112021 <1.0 286 <1.0 <1.0 38.4
1stQtr 31912022 <1.0 238 <1.0 <1.0 36.8
2nd Ctr 61812022 <1.0 323 <1.0 <1.0 36.6
3rdQtr 8/3012022 <1.0 302 <1.0 <1.0 39.3
TW4-41 (chlOfofoml pYmping well
512018)
2ndQtr 51812018 <1.0 1,400 <1.0 <1.0 42.8
3rdQtr 812212018 <1.0 1,390 <1.0 <1.0 45.5
4thQtr 11128/2018 <1.0 1 320 <1.0 <1.0 41.4
1stQtr 31812019 <1.0 1,220 <1.0 <1.0 39.1
2nd Qtr 61512019 <1.0 1,320 <1.0 <1.0 38.1
3rdQtr 91412019 <1.0 1,190 <1.0 <1.0 39.4
4thQtr 1211012019 <1.0 1 410 <1.0 <1.0 42.1
1stQtr 211912020 <1.0 1,200 <1.0 <1.0 44.4
2nd Qtr 512712020 <1.0 1,220 <1.0 <1.0 41.7
3rd Qtr 91412020 <1.0 1,110 <1.0 <1.0 40.2
4thQtr 1012812020 <1.0 1 020 <1.0 <1.0 39.7
1stQtr 212312021 <1 .0 1,170 <1.0 <1.0 40.6
2ndQtr 61912021 <1.0 1,130 <1.0 <1.0 39.5
3rdQtr • 812412021 <1.0 1,100 <1.0 <1.0 37.1
4thQtr 121112021 <1.0 1 030 <1.0 <1.0 43.2
1stQtr 31912022 <1.0 1,030 <1.0 <1.0 37.3
2nd Qtr 61812022 <1.0 1,010 <1.0 <1.0 41.1
3rdQtr 8/3012022 <1.0 1 060 <1.0 <1.0 41.9
TW4-42
2nd Qtr 6/1912019 <1.0 <1.0 <1.0 <1.0 23.3 ;;~,;:!. 911112019
<1.0 <1.0 <1.0 <1.0 20.6
12/1012019 <1.0 <1.0 <1.0 <1.0 22.6
TW4475 <1.0 <1.0 <1.0 <1.0 22.6
1stQtr 2/1712020 <1.0 <1.0 <1.0 <1.0 23.2
2ndQtr 611012020 <1.0 <1.0 <1.0 <1.0 23.1
3rdQtr 911712020 <1.0 <1.0 <1.0 <1.0 23.5
4thQtr 11/412020 <1.0 <1.0 <1.0 <1.0 22.4
1stQtr 311712021 <1.0 <1.0 <1.p <1.0 24.2
2nd Qtr 611512021 <1.0 <1.0 <1.0 <1.0 24.6
3rdQtr 911512021 <1.0 <1.0 <1.0 <1.0 16.6
4thQtr 12/912021 <1.0 <1.0 <1.0 <1.0 24.2
1stQtr 311512022 <1.0 <1.0 <1.0 <1.0 21.5
Duplicate TW4-65 <1.0 <1.0 <1.0 <1.0 17.7
2nd Qtr 611512022 <1.0 <1.0 <1.0 <1.0 24.0
3rd Qtr 9/1312022 <1.0 <1.0 <1.0 <1.0 22.8
TW4-43
4thQtr 121912021 <1.0 1<1.0 1<1.0 1<1.0 I 40.61
1stQtr 3117/2022 <1.0 <1.0 <1.0 <1.0 39.2
2ndQtr 6/1612022 <1.0 <1.0 <1.0 <1.0 41 .8
3rdQtr 911312022 <1.0 <1.0 <1.0 <1.0 43.1
Shaded indicates concentrat1ons exceeding GWQS
(2) Chloroform _pumina_ well started in M~yJ019 _____ .
Nitrate, Nitrate + Nitrite
C10ma/L)
3.08
3.33
3.22
3.54
3.18
3.18 -----------· 3.55
3.39
2.89
2.98
2.91
2.88
2.58
2.43
3.77
1.50
2.60
2.5
1.90
2.22
6.54
6.13
6.02
6.71
6.00
6.22
6.11
6.12
6.78
6.69
6.25
6.41
7.45
3.77
6.72
6.2
6.0
5.92
2.57
2.75
2.82
2.95
2.88
3.23
3.65
2.77
3.15
3.57
3.26
2.02
2.5
2.6
3.3
3.03
0.11811
0.4
0.24
0.383
Parameter GWQS
Chloride none
Nitrate + Nitrite (as N) 10 mg/L
Chloroform 70 µg/L
Carbon tetrachloride 5 ug/L
Chloromethane 30 LI!J/L
Methvlene Chloride 5 1in/L
nc = not calculated
Table 2
Summary of EFR QA/QC Samples
3rd Quarter 2022
Duplicate Samples of Wells
Duplicate of TW4-32 Duplicate of TW4-9
TW4-32 TW4-65 RPO TW4-9 TW4-70 RPO
51.8 53.6 -3.4 32.4 32.4 0.0
1.59 1.81 -12.9 0.673 0.66 2.0
<1 .0 <1.0 nc 10.8 8.7 21.5
<1.0 <1.0 nc <1 .0 <1.0 nc
<1 .0 <1.0 nc <1 .0 <1.0 nc
<1.0 <1.0 nc <1 .0 <1 .0 nc
High lighted exceeding PRO (Relitve % difference) of 20%
Duolicate of TW4-29
TW4-29 TW4-75 RPO
41 .8 42.0 -0.5
2.80 2.76 1.4
591 608 -2.8
<1 .0 <1 .0 nc
<1.0 <1.0 nc
<1 .0 <1.0 nc
Well ID MW4 MW-26 TW4-1
(1lChloroform (ug/L) 1,200 612 954
Chloroform (g/L) 1.20E-03 6.12E-04 9.54E-04
Chloroform (lbs/L) 2.65E-06 1.35E-06 2.11E-06
Chloroform (lbs/oall 1.00E-05 5.12E-06 7.98E-06
Total gallons pumped 82,718.6 28,531 .3 8,512.1
lbs of chloroform removed 0,8 0.1 0.07
Gallons of chloroform removed 0.07 0.01 0.01
total lbs of chloroform removed 12.4
total aallons of chloroform removed 1.0
Tabel3
Chloroform Mass Removal Calculations for the 3rd Qurater 2022
EFR White Mesa Mill, Bland, Utah
TW4-2 TW4-4 TW4-11 TW4-19 TW4-21 TW4-22
832 1,040 3,020 4,750 1,070 3,190
8.32E-04 1.04E-03 3.02E-03 4.75E-03 1.07E-03 3.19E-03
1.84E-06 2.30E-06 6.67E-06 1.0SE-05 2.36E-06 7.0SE-06
6.96E-06 8.70E-06 2.53E-05 3.97E-05 8.95E-06 2.67E-05
10,953.7 7,928.5 1,304.3 137,486.6 87,160.0 21 ,940.2
0.08 0.1 0.03 5.5 0.8 0.6
0.01 0.01 0.00 0.44 0.06 0.05
1) Assuming that the chloroform concentration result for the quarter monitoring event is the average chloroform concentration for the entire quarter.
TW4-24 TW4-25 TW4-37 TW4-39 TW4-40 TW4-41
88.9 0 11 ,600 843 302 1,060
8.89E-05 O.OOE+OO 1.16E-02 8.43E-04 3.02E-04 1.06E-03
1.96E-07 O.OOE+OO 2.56E-05 1.86E-06 6.67E-07 2.34E-06
7.43E-07 O.OOE+OO 9.70E-05 7.0SE-06 2.53E-06 8.86E-06
58,456.4 98,357.6 39,640.3 31 ,305.9 45,416.2 11 ,108.0
0.043 0.00 3.8 0.2 0.11 0.1
0.004 0.00 0.31 0.02 0.01 0.01