DRC-2017-003303 - 0901a068806f43bb

State of Utah
GARY R HERBERT
Governor
SPENCER J. COX
Lieutenant Governor
Department of
Environmental Quality
Alan Matheson
Executive Director
DIVISION OF WASTE MANAGEMENT
AND RADIATION CONTROL
Scott T. Anderson
Director
DRC- 2017- 003 303
MEMORANDUM
TO:
FROM:
DATE:
Phil Goble
Dean Henderson ^ / t / Z.O H
April 26, 2017
SUBJECT: Review of the 3rd and 4th Quarter, 2017 Chloroform Monitoring Reports for the
Chloroform Contamination Investigation, Energy Fuels Resources (USA) Inc. (“EFR“)
White Mesa Uranium Mill, near Blanding, Utah
The Utah Division of Waste Management and Radiation Control (“Division”) has reviewed the
November 17, 2016 3rd Quarter 2016 Chloroform Monitoring Report (“3rd Quarter, 2016”) and the
February 22, 2016 4th Quarter 2016 Chloroform Monitoring Report (“4th Quarter, 2016”) for the
Chloroform Contamination Investigation. For the review of this report the following regulatory
enforcement documents were used:
• EFR issued Ground Water Quality Discharge Permit No. UGW370004 (“Permit”). Permit
version that was signed on August 24, 2012.
• The EFR Quality Assurance Plan (“QAP”) June 7, 2012 (Revision. 7.2)
• The EFR Groundwater Corrective Action Plan (“GCAP”) September 14, 2015 (Revision 0)
• Utah Department of Environmental Quality Division of Radiation Control Guidance for
Groundwater Split Sampling Collection at Uranium Mill Operations, August 7, 2007.
REVIEW
Monitor Well Sampling
The following monitor wells were sampled as required in the QAP for both 3rd Quarter, 2016 and 4th
Quarter, 2016 (see Table 1 below):
MW-4 TW4-8 TW4-20 TW4-30
MW-26 TW4-9 TW4-21 TW4-31
195 North 1950 West • Salt Lake City, UT
Mailing Address. P.O. Box 144880 • Salt Lake City, UT 84114-4880
Telephone [phone] • Fax [phone] • T D D. (801) 536^1414
mmu.ckq.utnh.gov
Printed on 100% recycled paper
Page 2
MW-32
TW4-1
TW4-2
TW4-3
TW4-4
TW4-5
TW4-6
TW4-7
TW4-10
TW4-11
TW4-12
TW4-13
TW4-14
TW4-16
TW4-18
TW4-19
TW4-22
TW4-23
TW4-24
TW4-25
TW4-26
TW4-27
TW4-28
TW4-29
TW4-32
TW4-33
TW4-34
TW4-35
TW4-36
TW4-37
TW4-38 (4th quarter 2016)
TW4-39 (4th quarter 2016)
For both 3rd Quarter, 2016 and 4th Quarter, 2016 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):
In 1st Quarter, 2016 Wells: MW-32, TW4-5, TW4-7, TW4-8, TW4-9, TW4-13, TW4-16, TW4-
18, TW4-23, TW4-28, and TW4-32.
In 2nd Quarter, 2016 Wells: MW-32, TW4-3, TW4-5, TW4-7, TW4-8, TW4-9, TW4-12, TW4-
16, TW4-18, TW4-23, TW4-28, TW4-32, TW4-38 and TW4-39.
2. Purging a well to dryness and stability of field parameters for pH, specific conductivity, and
water temperature only after recovery:
In 1st Quarter, 2016 Wells: TW4-3, TW4-6, TW4-10, TW4-14, TW4-26, TW4-27, TW4-29,
TW4-30, TW4-31, TW4-33, TW4-34, TW4-35, and TW36.
In 2nd Quarter, 2016 Wells: TW4-6, TW4-10, TW4-13, TW4-14, TW4-26, TW4-27, TW4-29,
TW4-30, TW4-31, TW4-33, TW4-34, TW4-35, and TW36.
3. Pumping Wells: MW-4, MW-26, TW4-1, TW4-2, TW4-4, TW4-11, TW4-19, TW4-20, TW4-
21, TW4-22, TW4-24, TW4-25, TW4-37, and TW4-39.
For both 3rd Quarter, 2016 and 4th Quarter, 2016 the water samples for the above wells were analyzed
for the following constituents as required in the QAP:
Chloroform, Chloromethane, Carbon tetrachloride, Methylene chloride, Chloride and Nitrate + Nitrite as
Nitrogen. The analytical methods used is consistent with the requirements of the QAP.
Holding Times
For both 3rd Quarter, 2016 and 4th Quarter, 2016 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 in the QAP.
Page 3
Receipt Temperature
For both 3 rd Quarter, 2016 and 4th Quarter, 2016 all water samples were received within the required
QAP temperature limit of 6° C.
Detection Limits
For both 3rd Quarter, 2016 and 4th Quarter, 2016 all analytes 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
Two duplicate samples were collected for the 3rd Quarter, 2016. Monitor well TW4-28 and its duplicate
sample TW4-65, and TW4-23 and its duplicate sample TW4-70. All analytical results for the two
sample/duplicate pairs were within the 20% acceptance limits (see Table 2 below).
Three duplicate samples were collected for the 4th Quarter, 2016. Monitor well TW4-5 and its duplicate
sample TW4-75, TW4-28 and its duplicate sample TW4-65, and TW4-36 and its duplicate sample TW4-
70. All analytical results for the three sample/duplicate pairs were within the 20% acceptance limits (see
Table 2 below).
Groundwater Head Monitoring
For both 3rd Quarter, 2016 and 4th Quarter, 2016 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-3, 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 MW-4, MW-26,
TW4-1, TW4-2, TW4-4, TW4-11, TW4-19, TW4-20, TW4-21, TW4-22, TW4-24, TW4-25, TW4-37,
TW4-38, TW4-39 and TWN-2. Wells TW4-38 and TW4-39 (pumping well) are new wells that started
groundwater measurements in the 4th quarter 2016.
Mass Removed and Plume Residual Mass
Chloroform removal was first estimated from the first 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, 2016 is 24.7 lbs. and for the 4th Quarter, 2016 is 25.7 lbs. Table 3 below verifies
this estimate.
Page 4
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 1718 lbs. in the 3rd Quarter, 2016 and 1711
lbs. in the 4th Quarter, 2016. As per Part III.B.2 of the GCAP, the electronic files were used in both 3rd
Quarter, 2016 and 4th Quarter, 2016 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 pg/1 in the 1st quarter and 2nd Quarters 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; min x, max x
(UTME[m]): 631900, 633043; min y, max y (UTME[m]): 4154240, 4155550.64; grid spacing in
x, y (m): 15.24, 15.24
• Surfer chloroform concentration grid file.
• Concentration GE 70 Grid file
• Intermediate Surfer Grid Files: water level grid; aquifer base grid; saturated thickness grid
Based on the review of these files it appears that the date entered and generated is appropriate to
calculate an estimated chloroform mass within the chloroform plume and EFR followed Part III.B.2 and
Appendix A of the GCAP.
Reporting
For both 3rd Quarter, 2016 and 4th Quarter, 2016 reports 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 pg/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.
Page 5
-Calculate chloroform mass removed by pumping wells. Calculations
would include: 1) total historic chloroform mass removed, 2) total historic
chloroform mass removed for each pumping well, 3) total chloroform
mass removed for the quarter and, 4) total chloroform mass removed from
each pumping well for the quarter, 5) estimated residual mass of chloroform within the
plume.
d) Conclusions and Recommendations
e) Electronic copy of all laboratory results for Chloroform Investigation monitoring conducted
during the quarter.
f) Copies 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 and 4th Quarter, 2016 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 pg/L (GWQS = 70
Pg/L).
Performance Monitor Wells (“PM”) [Wells Exceeding Chloroform Concentrations GWQS of 70pg/Ll
Eight PM wells still exceed 70pg/L for both the 3rd Quarter and 4th Quarter, 2016: TW4-6, TW4-7,
TW4-8, TW4-9, TW4-10, TW4-16, TW4-29, and TW4-33 with the exception of TW4-16 witch was
below 70pg/L in the 3rd Quarter, 2016. (see Table 1 below).
Compliance Monitor Wells (“CM”! [Wells with Chloroform Concentrations below 70ug/Ll
For both the 3rd Quarter and 4th Quarter, 2016 six CM wells range with detectable chloroform
concentration but still below 70pg/L: TW4-5, TW4-14, TW4-18, TW4-24, TW4-27, and TW4-30.
PM Wells Below the Laboratory Chloroform Detection Limit (<1.0 ug/L)
For both the 3rd Quarter and 4th Quarter, 2016 the following monitor wells are below the laboratory
detection limit for chloroform (<1.0 pg/L): MW-32, TW4-3, TW4-12, TW4-13, TW4-23, TW4-28,
TW4-31, TW4-32, TW4-34, TW4-35, TW4-36, and TW4-38.
Pumping Wells
For both 3rd Quarter, 2016 and 4th Quarter, 2016 pumping wells MW-4, MW-26, TW4-1, TW4-2, TW4-
4, TW4-11, TW4-19, TW4-20, TW4-21 TW4-22,TW4-37, and TW4-39 exceed chloroform
concentrations of 70pg/L. For both the 3rd Quarter and 4th Quarter, 2016 pumping well TW4-24 had
detectable chloroform concentration but still below 70pg/L and TW4-25 had non-detectable chloroform
concentrations (<1.0 pg/L).
Page 6
Nitrate. Nitrate + Nitrite (“nitrate”) Concentrations
Pumping wells TW4-21, TW4-22, TW4-24, and TW4-39 all exceed the nitrate GWQS of 10 mg/1. All
of these nitrate exceedances for these wells appear to be a result of the nitrate contaminant plume up-
gradient of the chloroform contaminant plume. This nitrate contaminant plume is being addressed under
the Nitrate Corrective Action Plan (“NCAP”), approved on December 12, 2012.
Monitor wells TW4-10, TW4-12, TW4-26, TW4-27, and TW4-28, continue to exceeded the nitrate
GWQS of 10 mg/1. TW4-38 the newly installed well sampled for the first time in the 4th quarter 2016
also exceeded (11.2mg/l) the nitrate GWQS. The source of these nitrate exceedances appear not to be
associated with the nitrate plume addressed in the NCAP. The nitrate source for these wells may be
from the same source as the chloroform plume.
TW4-10 is located within the chloroform plume 70 pg/L boundary (1510 pg/L). Both the nitrate and
chloroform concentrations at TW4-10, TW4-12, and TW4-38 are likely to be captured at downgradient
pumping wells MW-4, TW4-2 or TW4-11.
TW4-28 is approximately 235 feet downgradient of TW4-12 and the source of nitrate may not be from
the chloroform plume because they are outside plume boundary with chloroform concentrations of <1.0
pg/L. Because well TW4-32 is approximately 250 feet down gradient of TW4-28 and has a nitrate
concentration below the GWQS of 2.87 mg/L in the 4th quarter, 2016 at this time no action is
recommended. However, should future nitrate concentration in TW4-32 increases to above 10 mg/L or
has an increasing trend additional investigations may be recommended.
TW4-26 source of nitrate may not be from the chloroform plume because its outside plume boundary
with chloroform concentrations of 19.9 pg/L in the 4th quarter, 2016. Because wells TW4-29 and TW4-
34 are approximately 500 feet down gradient of TW4-26 and have nitrate concentrations below the
GWQS of 2.4 mg/L and 0.6 mg/L respectively in the 4th quarter, 2016, at this time no action is
recommended. However, should future nitrate concentrations in TW4-29 and TW4-34 increases to
above 10 mg/L or shows increasing trends additional investigations may be recommended.
TW4-27 source of nitrate may not be from the chloroform plume because its outside plume boundary
with a chloroform concentration of 3.8 pg/L in the 4th quarter, 2016. Because well TW4-31 is
approximately 200 feet down gradient of TW4-27 that has a nitrate concentration below the GWQS of
1.14 mg/L in the 4th quarter, 2016 at this time no action is recommended. However, should future
nitrate concentrations in TW4-31 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 for the Division Director Signature, notifying EFR of the review and closing out of
For both 3 rd Quarter, 2016 and 4th Quarter, 2016 Chloroform Monitoring Reports for the chloroform
contamination investigation.
Page 7
References
EFR Quality Assurance Plan, June 7, 2012 (Revision. 7.2)
EFR issued Ground Water Quality Discharge Permit No. UGW370004. Permit version that was
signed on August 24, 2012.
EFR Groundwater Corrective Action Plan, September 14, 2015 (Revision 0)
EFR, White Mesa Uranium Mill Chloroform Monitoring Report 3rd (July through September)
Quarter 2016, November 16, 2016. (DRC-2016-011529)
EFR, White Mesa Uranium Mill Chloroform Monitoring Report 4th (October through December)
Quarter 2016, February 22, 2017. (DRC-2017-001601)
EFR letter, State of Utah Stipulation and Consent Order (“SCO”) Docket Number UGW-20-01
White Mesa Uranium Mill - Energy Fuels Resources (USA) Inc. (“EFRI”) Notice Pursuant
to Part II.H.l of the Groundwater Corrective Action Plan (“GCAP”) included as
Attachment 1 to the SCO, August 18, 2016. (DRC-2016-009409)
EFR, White Mesa Mill, State of Utah Stipulation and Consent Order (“SCO”) Docket Number
UGW-20-01 Plan and Time Schedule Under Part H.H.2 for Exceedances in TW4-09 in the
Second Quarter of 2016, September 9, 2016. (DRC-2016-010003)
EFR letter, Notification for Installation of Chloroform Wells TW4-38 and TW4-39, White Mesa
Uranium Mill, September 23, 2016. (DRC-2016-010313)
Utah Department of Environmental Quality Division of Radiation Control Guidance for
Groundwater Split Sampling Collection at Uranium Mill Operations, August 7, 2007.
Utah Department of Environmental Quality Division of Waste Management and Radiation
Control, September 9, 2016, Plan and Time Schedule to install new wells TW4-38 and TW4-39
Docket No. UGW20-01-SCO, September 19, 2016. (DRC-2016-010163)
TABLE 1 (1 of 29)
Historic Summary Of Monitoring Parameters Up To The 4th Quarter 2016
Chloroform Contamination Investigation
DUSA White Mesa Mill
Well
Sampling Event
Parameter
(GWQS)
Carbon Tetrachloride
(5 pg/L)
Chloroform
(70 pg/L)
Chloromethane
(30 pg/L)
Methylene Chloride
(5 pg/L)
Chloride
No GWQS (mq/L)
Nitrate, Nitrate + Nitrite
(10 mg/L)
MW-4 (chloroform
3/4/03)
1st Qtr 3/16/05 NA 2,900 NA NA NA 6.3
2nd Qtr 5/25/05 NA 3,170 NA NA NA 7.1
3rd Qtr 8/31/05 <10 3,500 <10 <10 NA 7.0
4th Qtr 12/7/05 <50 3,000 <50 <50 53 7.0
1st Qtr 3/9/06 <50 3,100 <50 <50 49 6.0
2nd Qtr 6/14/06 <50 3,000 <50 <50 49 6.0
3rd Qtr 7/20/06 <50 2,820 <50 <50 48 1.2
4th Qtr 11/8/06 2.1 2,830 1.4 <1.0 50 6.4
1st Qtr 2/28/07 1.6 2,300 <1.0 <1.0 47 6.3
2nd Qtr 6/27/07 1.8 2,000 <10 <1.0 45 7.0
3rd Qtr 8/15/07 1.9 2,600 <1.0 <1.0 47 62
4th Qtr 10/10/07 1.7 2,300 <1.0 <1.0 45 6.2
1st Qtr 3/28/08 1.7 2,400 <1.0 <10.....42 5.8
2nd Qtr 6/25/08 1.8 2,500 <1.0 <1.0 42 6.1
3rd Qtr 9/10/08 1.8 1,800 <10 <1.0 35 6.4
4th Qtr 10/15/08 1.7 ...............2,100 <1.0 <1.0 45 5.9
1st Qtr 3/4/09 1.5 2,200 <1.0 <1.0 37 5.7
2nd Qtr 6/23/09 1.3 1,800 <1.0 <1.0 34 5.2
3rd Qtr 9/14/09 1.4 2,000 <1.0 <1.0 43 5.3
4th Qtr 12/14/09 1.6 1,800 <1.0 <1.0 44 5.8
1st Qtr 2/17/10 1.2 1,600 <1.0 <1.0 45 4.0
2nd Qtr 6/14/10 1.2 2,100 <1.0 <1.0 41 5.1
3rd Qtr 8/6/10 1.5 1,900 <1.0 <1.0 38 4.8
4th Qtr 10/15/10 1.4 1,500 <1.0 <1.0 41 4.9
1st Qtr 2/23/11 1.5 1,700 <1.0 <1.0 40 4.6
2nd Qtr 6/1/11 1.4 1,700 <1.0 <1.0 35 4.9
3rd Qtr 8/17/11 1.1 1,700 <1.0 <1.0 41 4.9
4th Qtr 11/16/11 1.3 1.600 <1.0 <1.0 40 5.1
(1)1st Qtr 1/23/12 1 1,500 <1.0 <1.0 41.0 4.8
2nd Qtr 6/6/12 1.2 1,400 <1.0 <1.0 39.0 4.9
3rd Qtr 9/4/12 1.5 1,500 <1.0 <1.0 41.0 5.0
4th Qtr 10/4/12 1 1,300 <10 <1.0 41.0 4.8
1st Qtr 2/11/13 1.48 1,670 <1.0 <1.0 37.8 4.78
2nd Qtr 6/5/13 1.31 1,490 <1.0 <1.0 44.0 4.22
3rd Qtr 9/3/13 1.13 1,520 <1.0 <1.0 41 4 4.89
4th Qtr 10/29/13 5.58 1,410 <1.0 <1.0 40.1 5.25
1st Qtr 1/27/14 4.15 1,390 <1.0 <1.0 38.5 4.7
2nd Qtr 5/19/14 5.21 1,390 <1.0 <1.0 39.9 4.08
3rd Qtr 8/11/14 7.6 1,490 <1.0 <1.0 41.0 3.7
4th Qtr 10/21/14 <1.0 1,440 <1.0 <1.0 41.5 5.07
1st Qtr 3/9/15 1.26 1,400 <1.0 <1.0 40.7 5.75
2nd Qtr 6/8/15 <1.0 1,300 <1.0 <1.0 43.1 2.53
3rd Qtr 8/31/15 <1.0 1,200 1.42 <1.0 44.3 479
4th Qtr 10/19/15 <1.0 1,200 <1.0 <1.0 40.8 4.43
1st Qtr 3/9/16 <1.0 1,240 <1.0 <1.0 42.2 5.15
2nd Qtr 5/23/16 1.44 1,580 <10 <1.0 43.7 4.54
3rd Qtr 7/25/16 <1.0 1,430 <1.0 <1.0 42.5 4 95
4th Qtr 10/12/16 1 24 1,470 <1.0 <1.0 44.8 4.88
MW-4A(TW4-A)
1st Qtr 3/16/05 NA 3,700 NA NA NA 7.1
2nd Qtr 5/25/05 NA 3,740 NA NA NA 7.8
3rd Qtr 8/31/05 <10 3,800 <10 <10 NA 6.9
4th Qtr 12/7/05 <50 3,000 <50 <50 55 6.7
1st Qtr 3/9/06 <50 3,700 <50 <50 53 5.8
2nd Qtr 6/14/06 <50 3,300 <50 <50 54 7.3
3rd Qtr 7/20/05 <50 3,190 <50 <50 54 1.2
4th Qtr 11/8/05 2.4 3,370 <1.0 <1.0 54 7.1
1st Qtr 2/28/07 1.9 2,500 <i 6 <1.0 60 7.1
Well abandonded
(1) As of March 2012 both north and south wild life ponds no longer receiving water
NA = not analyzed
Shaded indicates concentrations exceeding GWQS.
Bold and italics indicates the MDL exceeded the GWQS.
TABLE 1 (2 of 29)
Historic Summary Of Monitoring Parameters Up To The 4th Quarter 2016
Chloroform Contamination Investigation
DUSA White Mesa Mill
Well
Sampling Event
Parameter
(GWQS)
Carbon Tetrachloride
(5 pg/L)
Chloroform
(70 pg/L)
Chloromethane
(30 pg/L)
Methylene Chloride
(5 pg/L)
Chloride
No GWQS (mg/L)
Nitrate, Nitrate + Nitrite
(10 mg/L)
MW-26 (former TW4-15)
Chloroform pumping well started
8/8/03
1st Qtr 3/16/05 NA 310 NA NA NA 0.3
2nd Qtr 5/25/05 NA 442 NA NA NA 0.2
3rd Qtr 8/31/05 <5.0 960 5.4 <5.0 NA 0.2
4th Qtr 12/7/05 <50 1,000 <50 <50 55 0.3
1st Qtr 3/9/06 <50 1,100 <50 <50 52 0.2
2nd Qtr 6/14/06 <50 830 <50 <50 52 0.2
3rd Qtr 7/20/06 <50 2,170 <50 <50 65 ...................1.4
4th Qtr 11/8/06 <1.0 282 <1.0 2.6 54 0.3
1st Qtr 2/28/07 <1.0 570 <1.0 5.5 56 0.6
2nd Qtr 6/27/07 <1.0 300 <1.0 13 49 0.4
3rd Qtr 8/15/07 <1.0 1,400 <1.0 36 57 1
4th Qtr 10/10/07 <1.0 2,000 <1.0 14 57 0.6
1st Qtr 3/28/08 <1.0 930 <1.0 40 49 0.1
2nd Qtr 6/25/08 <1.0 1,300 <1.0 53 57 0.6
3rd Qtr 9/10/08 <1.0 630 <1.0 24 44 0.2
4th Qtr 10/15/08 NA NA NA NA 64 0.1
11/18/08 <2.0 1,700 <2.0 100 NA NA
1st Qtr 3/4/09 <1.0 950 <1.0 51 49 0.4
2nd Qtr 6/23/09 <1.0 410 <1.0 12 48 0.2
3rd Qtr 9/14/09 <1.0 850 <1.0 30 46 0.1
4th Qtr 12/14/09 <1.0 1,100 <1.0 40 60 2.3
1st Qtr 2/17/10 <1.0 730 <1.0 19 57 0.2
2nd Qtr 6/14/10 1.2 1,600 <1.0 <1.0 40 6.8
3rd Qtr 8/16/10 <1.0 2,200 <1.0 21 49 0.6
4th Qtr 10/15/10 <1.0 970 <1.0 6.5 65 0.7
1st Qtr 2/23/11 <1.0 450 <1.0 3.6 57 0.5
2nd Qtr 5/31/11 <1.0 1,800 <1.0 1.3 88 0.4
3rd Qtr 8/17/11 <1.0 720 <1.6 7.2 58 0.9
4th Qtr 11/16/11 NA NA NA NA 69 2.0
(,)12/5/11 <1.0 1,800 <1.0 2.9 NA NA
(2)1st Qtr 2/7/12 <1.0 2,400 <1.0 16 98 1.7
2nd Qtr 6/6/12 <1.0 3,000 <1.0 21 73 2.5
3rd Qtr 9/4/12 <1 3,100 <1 31 73 2.6
4th Qtr 10/4/12 <1 1,200 <1 4 68 1.8
1st Qtr 2/11/13 <1 2,120 <1 9.34 81.9 2.27
2nd Qtr 6/5/13 <1.0 4,030 <1.0 524 77.9 2.11
3rd Qtr 9/3/13 <1.0 2,940 <1.0 33.2 60.5 1.18
4th Qtr 10/29/13 <1.0 1,410 <1 4.03 72.3 1.38
1st Qtr 1/27/14 <1.0 1,400 <1.0 13.8 59.4 0.55
2nd Qtr 5/19/14 <1.0 1,960 <1.0 15.4 53.4 0.93
3rd Qtr 8/11 /14 <1.0 2,120 8.7 26 59 0.7
4th Qtr 10/21/14 <1.0 2,090 <1.0 23.2 60.1 0.93
1st Qtr 3/9/15 <1.0 1.980 <1.0 27.4 56.5 0.73
2nd Qtr 6/8/15 <i.b 1,980 <1.0 11.2 62 0.42
3rd Qtr 8/31/15 <1.0 2,350 4.05 11.6 69.6 0.68
4th Qtr 10/19/15 <1.0 2,680 1.32 8.28 62.6 0.991
1st Qtr 3/9/16 <1.0 2,650 <1.0 4.66 68.3 1.45
2nd Qtr 5/23/16 <1.0 2,220 <1.0 4.57 66.2 1.12
3rd Qtr 7/25/16 <1.0 3,190 <1.0 7.81 66.4 1.57
4th Qtr 10/12/16 <1.0 2.510 <1.0 4.31 66.2 1.18
(1) VOCs were resampled because laboratory missed holding time.
(2) As of March 2012 both north and south wild life ponds no longer receiving water.
NA = not analyzed
Shaded indicates concentrations exceeding GWQS.
Bold and italics indicates the MDL exceeded the GWQS.
TABLE 1 (3 Of 29)
Historic Summary Of Monitoring Parameters Up To The 4th Quarter 2016
Chloroform Contamination Investigation
DUSA White Mesa Mill
Well
Sampling Event
Parameter
(GWQS)
Carbon Tetrachloride
(5 pg/L)
Chloroform
(70 pg/L)
Chloromethane
(30 pg/L)
Methylene Chloride
(5 pg/L)
Chloride
No GWQS (mg/L)
Nitrate, Nitrate + Nitrite
(10 mg/L)
MW-32 (former TW4-17)
1st Qtr 3/16/05 NA <1.0 NA NA NA <0.1
2nd Qtr 5/25/05 NA <1.0 NA NA NA <0.1
3rd Qtr 8/31/05 <1.0 <1.0 3.2 <1.0 NA <0.1
4th Qtr 12/7/05 <1.0 <1.0 <1.0 <1.0 33 <0.1
1st Qtr 3/9/06 <1.0 <1.0 <1.0 <1.0 32 <0.1
2nd Qtr 6/14/06 <1.0 <1.0 3.5 <1.0 30 <0.1
3rd Qtr 7/20/06 <1.0 <1.0 1.8 <1.0 32 <1.0
4th Qtr 11/8/06 <1.0 <1.0 1.5 <1.0...........................31 <1
1st Qtr 2/28/07 <1.0 <1.0 <1.0
<i.6 32 <1.0
2nd Qtr 6/27/07 <1.0 <1.0 <1.0 <1.0 32 <1.0
3rd Qtr 8/15/07 <1.0 <1.0 <1.0 <1.0 31 <1.0
4th Qtr 10/10/07 <1.0 <1.0 <1.0 <1.0 32 <1.0
1st Qtr 3/28/08 <1.0 <1.0 <1.0 <1.0 31 <1
2nd Qtr 6/25/08 <1.0 <1.0 <1.0 <1.0 29 <1.0
3rd Qtr 9/10/08 <1.0 <1.0 <1.0 <1.0 30 <1.0
4th Qtr 10/15/08 <1.0 <1.0 <1.0 <1.0 26 <0.05
1st Qtr 3/4/09 <1.0 <1.0 <1.0 <1.0 30 <1
2nd Qtr 6/23/09 <1.0 <1.0 <1.0 <1.0 31 <0.1
3rd Qtr 9/14/09 <1.0 <1.0 <1.0 <1.0 33 <0.1
4th Qtr 12/16/09 <1.0 <1.0 <1.0 <1.0 35 <0.1
1st Qtr 2/17/10 <1.0 <1.0 <1.0 <1.0 38 <0.1
2nd Qtr 6/14/10 <1.0 <1.0 <1.0 <1.0 32 <0.1
3rd Qtr 8/16/10 <1.0 <1.0 <1.0 <1.0 28 <0.1
4th Qtr 10/15/10 <1.0 <1.0 <1.0 <1.0 24 <0.1
1 st Qtr 2/23/11 <1.0 <1.6 <i 6 <i.6 40 <6 i
2nd Qtr 5/25/11 <1.0 <1.0 <1.0 <1.0 31 <0.1
3rd Qtr 8/16/11 <1.0 <1.0 <1.0 <1.0 33 <0.1
4th Qtr 11/16/11 NA NA NA NA 32 <0.1
(,) 12/7/11 <1.0 <1.0 <1.0 <1.0 NA NA
(2)1st Qtr 1/18/12 <1.0 <1.0 <1.0 <1.0 21 <0.1
2nd Qtr 6/22/12 <1.0 <1.0 <1.0 <1.0 32 <0.1
3rd Qtr 9/5/12 <1.0 <1.0 <10 <1.0 33 <0.1
4th Qtr 10/10/12 <1.0 <1.0 <1.0 <1.0 35 <0.1
1st Qtr 2/1 i/13 <i.6 <1.0 <1.0 <1.0 34.3 <0.1 1
2nd Qtr 6/18/13 <1.0 <1.0 <1.0 <1.0 34.9 <0.1
3rd Qtr 9/3/13 <1.0 <1.0 <1.0 <1.0 33 <0.1
4th Qtr 10/29/13 <1.0 <1.0 <10 <1.0 35.7 <0.1
1st Qtr 1/29/14 <1.0 <1.0 <1.0 <1.0 34 <0.1
2nd Qtr 5/23/14 <1.0 <1.0 <1.0 <1.0 39.7 <0.1
3rd Qtr 8/26 /14 <1.0 <1.0 <1.0 <1.0 34 <0.1
4th Qtr 10/29/14 <1.0 <1.0 <1.0 <1.0 34.9 <0.1
1st Qtr 3/17/15 <1.0 <1.0 <10 <1.0 36.3 <0.1
2nd Qtr 6/11/15 <1.0 <1.0 <1.0 <1.0 35.8 <0.1
3rd Qtr 9/9/15 <1.0 <1.0 <1.0 <1.0 37.7 <0.1
4th Qtr 10/28/15 <1.0 <1.0 <1.0 <1.0 34.7 <0.1
1st Qtr 3/22/16 <1.0 <1.0 <10 <1.0 36.7 <0.1
Duplicate TW4-70 <1.0 <1.0 <1.0 <1.0 37.7 0.119
2nd Qtr 6/8/16 <1.0 <1.0 <1.0 <1.0 364 <0.1
Duplicate TW4-70 <1.0 <1.0 <1.0 <1.0 37.7 <0.1
3rd Qtr 8/19/16 <1.0 <1.0 <1.0 <1.0 35.7 <0.1
4th Qtr 10/31/16 <1.0 <1.0 <10 <1.0 36 9 <0.1
(1) VOCs were resampled because laboratory missed holding time.
(2) As of March 2012 both north and south wild life ponds no longer receiving water
NA = not analyzed
Shaded indicates concentrations exceeding GWQS.
TABLE 1 (4 of 29)
Historic Summary Of Monitoring Parameters Up To The 4th Quarter 2016
Chloroform Contamination Investigation
DUSA White Mesa Mill
Well
Sampling Event
Parameter
(GWQS)
Carbon Tetrachloride
(5 pg/L)
Chloroform
(70 pg/L)
Chioromethane
(30 pg/L)
Methylene Chloride
(5 pg/L)
Chloride
No GWQS (mq/L)
Nitrate, Nitrate + Nitrite
(10 mq/L)
TW4-1 (chloroform pumping
well started in 1/14/15)
1st Qtr 3/16/05 NA 2,700 NA NA NA 9.1
2nd Qtr 5/25/05 NA 3,080 NA NA NA 10.6
3rd Qtr 8/31/05 <10 2,900 <10 <10 NA 9.8
4th Qtr 12/7/05 <50 2,400 <50 <50 52 9 7
1st Qtr 3/9/06 <50 2,700 <50 <50 49 9.4
2nd Qtr 6/14/06 <50 2,200 <50 <50 48 9.6
3rd Qtr 7/20/06 <50 2,840 <50 <50 51
4th Qtr 11/8/06 1.4 2,260 <1.0 <1.0 47 9.2
1st Qtr 2/28/07 1.2 1,900 <1.0 <1.0 47 8.9
2nd Qtr 6/27/07 1.4 1,900 <1.0 <1.0 45 9
3rd Qtr 8/15/07 1.3 2,300 <1.0 <1.0 43 8.4
4th Qtr 10/10/07 1.3 2,000 <1.0 <1.0 43 7.8
1st Qtr 3/28/08 1.3 2,000 <1.0 <1.0 39 7.6
2nd Qtr 6/25/08 1.1 1,900 <1.0 <1.0 39 8.68
3rd Qtr 9/10/08 1.3 1,700 <1.0 <1.0 35 8.15
4th Qtr 10/15/08 1.3 1,700 <1.0 <1.0 41 9 3
1st Qtr 3/11/09 1.1 1,700 <1.0 <1.0 37 7.5
2nd Qtr 6/23/09 1 1,500 <1.0 <1.0 37 6.9
3rd Qtr 9/14/09 <1.0 1,700 <1.0 <1.0 36 7.3
4th Qtr 12/29/09 <1.0 1,400 <1.0 <1.0 41 6.8
1st Qtr 3/3/10 <1.0 1,300 <1.0 <1.0 35 7.1
2nd Qtr 6/14/10 1.2 1,600 <1.0 <1.0 40 6.8
3rd Qtr 8/18/10 1 1,600 <1.0 <1.0 35 6.7
4th Qtr 10/15/10 <1.0 1,500 <1.0 <1.0 40 6.6
1st Qtr 2/24/11 <1.0 1,300 <1.0 <1.0 41 6.6
2nd Qtr 6/1/11 <1.0 1,200 <1.0 <1.6 35 6.6
3rd Qtr 8/18/11 <1.0 1,300 <1.0 <1.0 36 6.8
4th Qtr 11/29/11 <1.0 1,500 <1.0 <1.0 40 6.6
(1)1st Qtr 1/24/12 <1.0 1,300 <1.0 <1.0 38 6.8
2nd Qtr 6/14/12 <1.0 1,000 <1.0 <1.0 42 7.1
3rd Qtr 9/28/12 <1.0 1,000 <1.0 <1.0 39 5.0
4th Qtr 10/4/12 <1.0 1,100 <1.0 <1.0 40 6.5
1st Qtr 2/13/13 3.66 1,320 <1.0 <1.0 37.6 6.99
2nd Qtr 6/19/13 <1.0 1,100 <1.0 <1.0 39.1 6.87
3rd Qtr 9/3/13 <1.0 1,150 <1.0 <1.0 37.6 7.12
4th Qtr 11/14/13 <1.0 1,280 <1.0 <1.0 36.5 7.08
1st Qtr 2/5/14 5.47 1,090 <1.0 <1.0 38.9 7.74
2nd Qtr 5/23/14 4.77 1,020 <1.0 <1.0 37.4 6.93
3rd Qtr 8/27/14 <1.0 845 1.4 <1.0 38 4.80
4th Qtr 10/29/14 <1.0 1,140 <1.0 <1.0 38.7 6.31
(2)1st Qtr 3/9/15 <1.0 1,130 <1.0 <1.0 38.3 7.06
2nd Qtr 6/8/15 <1.0 1,260 <1.0 <1.0 40.3 6.07
3rd Qtr 8/31/15 <1.0 1,060 <1.0 <1.0 45.9 6.28
4th Qtr 10/19/15 <1.0 1,040 <1.0 <1.0 38.5 1.55
1st Qtr 3/9/16 <1.0 974 <1.0 <1.0 41.7 0.148
2nd Qtr 5/23/16 <1.0 1,140 <1.0 <1.0 44.4 0.138
3rd Qtr 7/25/16 <1.0 1,160 <1.0 <1.0 44.7 5.49
4th Qtr 10/13/16 <1.0 1.330 <1.0 <1.0 44.2 0.746
(1] As of March 2012 both north_and south_wHd Jifeponds no longer receiving water.
_(2] ^lorofOhnjgi£n£[n^we]l_started_inJ/14/15___
NA = not analyzed
Shaded indicates concentrations exceeding GWQS.
Bold and italics indicates the MDL exceeded the GWQS.
TABLE 1 (5 of 29)
Historic Summary Of Monitoring Parameters Up To The 4th Quarter 2016
Chloroform Contamination Investigation
DUSA White Mesa Mill
Well
Sampling Event
Parameter
(GWQS)
Carbon Tetrachloride
_______(5 pg/L)_______
Chloroform
(70 P9/L)
Chloromethane
(30 pg/L)
Methylene Chloride
(5 pg/L)
Chloride
No GWQS (mq/L)
Nitrate, Nitrate + Nitrite
(10 mg/L)
TW4-2 (chloroform pumping
weH starling 1/H/15)
1st Qtr 3/16/05 NA 3,700 NA NA NA 7.7
2nd Qtr 5/25/05 NA 3,750 NA NA NA 86
3rd Qtr 8/31/05 <10 3,900 <10 <10 NA 8.0
4th Qtr 12/7/05 <50 3,500 <50 <50 56 7.8
1st Qtr 3/9/06 <50 3,800 <50 <50 56 7.5
2nd Qtr 6/14/06 <50 3,200 <50 <50 56 7.1
3rd Qtr 7/20/06 <50 4,120 <50 <50 54 7.4
4th Qtr 11/8/06 2.3 3,420 <1.0 <1.0 55 7.6
1st Qtr 2/28/07 1.8 2,300 <1.0 <1.0 54 7.3
2nd Qtr 6/27/07 2.5 3,000 <1.0 <1.0 50 78
3rd Qtr 8/15/07 2.2 340 (?)<1.0 <1.0 49 7.3
4th Qtr 10/10/07 2.1 3,200 <1.0 <1.0 51 69
1st Qtr 3/28/08 2.3 3,300 <1.0 <1.0 48 6.9
2nd Qtr 6/25/08 2.2 3,100 <1.0 <1.0 46 7.4
3rd Qtr 9/10/08 2.4 2,800 <1.0 <1.0 42 7.1
4th Qtr 10/15/08 NA NA NA NA 47 8.0
11/18/08 2.4 3,200 <2.0 <2.0 NA NA_
1st Qtr 3/11/09 2.2 3,100 <1.0 <1.0 46 ....6 5
2nd Qtr 6/23/09 2 2,800 <10 <1.0 44 64
3rd Qtr 9/14/09 2 3,000 <1.0 <1.0 43 6.6
4th Qtr 12/29/09 2 1,600 <1.0 <1.0 46 6.4
1st Qtr 3/3/10 2 2,600 <1.0 <1.0 42 6.8
2nd Qtr 6/14/10 2.6 3,300 <1.0 <1.0 43 8.7
3rd Qtr 8/18/10 2.5 3,300 <1.0 <1.0 43 6.6
4th Qtr 10/15/10 2.1 ...............3,000 <1.0 <1.0 __________________41 ......................... 6.5
1st Qtr 2/24/11 2.4 3,100 <1.0 <1.0 .....46 7.0
2nd Qtr 6/2/11 2.2 3,000 <1.0 <1.0 42 6.8
3rd Qtr 8/17/11 1.6 2,400 <1.0 <1.0 48 6.0
4th Qtr 11/29/11 2.8 3,900 <1.0 <1.0 49 7.0
(1)1st Qtr 1/24/12 2 2,500 <10 <1.0 49 7.1
2nd Qtr 6/14/12 2.1 2,500 <1.0 <1.0 52 7.7
3rd Qtr 9/28/12 1.8 2,900 <1.0 <1.0 76 4 0
4th Qtr 10/4/12 2 3,100 <1.0 <1.0 49 7.6
1st Qtr 2/13/13 5.17 3,580 <1.0 <1.0 46 8.1
2nd Qtr 6/19/13 265 3,110 2 <1.0 46.9 7.51
3rd Qtr 9/3/13 2.41 3,480 <1.0 <1.0 44.9 9.3
4th Qtr 11/14/13 3.15 3,740 <1.0 <1.0 43.9 8.39
1st Qtr 2/6/14 7.1 3,180 <1.0 <1.0 45.9 7.87
2nd Qtr 5/23/14 6.05 2,930 <1.0 <1.0 45.4 9.11
3rd Qtr 8/27/14 14 3,170 3.6 <1.0 45 6 2
4th Qtr 10/30/14 2.6 3,580 <1.0 <1.0 45.5 8.45
(2)1st Qtr 3/9/15 1.44 1,840 <1.0 <1.0 44 9 5.32
2nd Qtr 6/8/15 <1.0 1,650 <1.0 <1.0 48.1 4.3
3rd Qtr 8/31/15 <1.0 1,060 2.6 <1.0 50 3.76
4th Qtr 10/19/15 2.6 2,070 <1.0 <1.0 41.9 5.18
1st Qtr 3/9/16 1.2 1,970 <1.0 <1.0 43.4 5 30
2nd Qtr 5/23/16 1.49 2,070 <1.0 <1.0 43.8 5.67
3rd Qtr 7/25/16 <1.0 1,780 <1.0 <1.0 42.9 4.07
4th Qtr 10/12/16 <1.0 1,600 <1.0 <1.0 44.3 6.07
Sh Asof_March 2012 both north _and south_wild lifeponds no longer receiving water
J2] ch loroformpi£T)£i n£ wel]_stariedjnj /14/15_ _
NA = not analyzed
Shaded indicates concentrations exceeding GWQS.
Bold and italics indicates the MDL exceeded the GWQS.
TABLE 1 (6 of 29)
Historic Summary Of Monitoring Parameters Up To The 4th Quarter 2016
Chloroform Contamination Investigation
DUSA White Mesa Mill
Well
Sampling Event
Parameter
(GWQS)
Carbon Tetrachloride
(5 pg/L)
Chloroform
(70 pg/L)
Chloromethane
(30 pg/L)
Methylene Chloride
(5 pg/L)
Chloride
No GWQS (mg/L)
Nitrate, Nitrate + Nitrite
(10 mg/L)
TW4-3
1st Qtr 3/16/05 NA <1.0 NA NA NA 3.5
2nd Qtr 5/25/05 NA <1.0 NA NA NA 3.7
3rd Qtr 8/31/05 <1.0 <1.0 6.4 <1.0 NA 3.5
4th Qtr 12/7/05 <1.0 <1.0 <1.0 <1.0 26 3 3
1st Qtr 3/9/06 <1.0 <1.0 2.3 <1.0 26 3.3
2nd Qtr 6/14/06 <1.0 <1.0 1.6 <1.0 26 7.1
3rd Qtr 7/20/06 <1.0 <1.0 2 2 <1.0 26 2.9
4th Qtr 11/8/06 <1.0 <1.0 <10 <1.0 23 1.5
1st Qtr 2/28/07 <1.0 <1.0 <1.0 <1.6 22 3.1
2nd Qtr 6/27/07 <1.0 <1.0 <1.0 <1.0 23 3.3
3rd Qtr 8/15/07 <1.0 <1.0 <10 <1.0 24 3.1
4th Qtr 10/10/07 <1.0 <1.0 <10 <1.0 27 2.8
1st Qtr 3/28/08 <1.0 <1.0 <1.0 <1.0 21 2.8
2nd Qtr 6/25/08 <1.0 <1.0 <1.0 <1.0 19 2.9
3rd Qtr 9/10/08 <1.0 <1.0 <1.0 <1.0 19 2.7
4th Qtr 10/15/08 <1.0 <1.0 <1.0 <1.0 22 2.6
1st Qtr 3/4/09 <1.0 <1.0 <1.0 <1.0 21 2.5
2nd Qtr 6/23/09 <1.0 <1.0 <1.0 <1.0 20 2.9
3rd Qtr 9/14/09 <1.0 <1.0 <1.0 <1.0 21 2.8
4th Qtr 12/29/09 <1.0 <1.0 <1.0 <1.0 22 2.6
1st Qtr 2/23/10 <1.0 <1.0 <1.0 <1,0 23 2 8
2nd Qtr 6/14/10 <1.0 <1.0 <1.0 <1.0 24 3.0
3rd Qtr 8/10/10 <1.0 <1.0 <1.0 <1.0 22 3.1
4th Qtr 10/15/10 <1.0 <1.0 <1.0 <1.0 26 3 3
1st Qtr 2/15/11 <1.0 <1.0 <1.0 <1.6 23 3.5
2nd Qtr 5/25/11 <1.0 <1.0 <1.0 <1.0 23 3.7
3rd Qtr 8/16/11 <1.0 <1.0 <1.0 <1.0 23 4.0
4th Qtr 11/14/11 <1.0 <1.0 <1.0 <1.0 23 4.4
(1)1st Qtr 1/17/12 <1.0 <1.0 <1.0 <1.0 21 7.1
2nd Qtr 5/31/12 <1.0 <1.0 <1.0 <1.0 24 4.4
3rd Qtr 8/29/12 <1.0 <1.0 <1.0 <1.0 25 4.9
4th Qtr 10/3/12 <1.0 <1.0 <1.0 <1.0 25 4.8
1st Qtr 2/7/i 3 <1.0 <1.0 <1.0 <1.0 23.7 5.05
2nd Qtr 6/29/13 <1.0 <1.0 <1.0 <1.0 23.8 5.83
3rd Qtr 9/3/13 <1.0 <1.0 <1.0 <1.0 25 4.90
4th Qtr 11/6/13 <1.0 <1.0 <1.0 <1.0 24.1 5.89
1st Qtr 1/22/14 <1.0 <1.6 <1.6 <1.6 24.9 6.66
2nd Qtr 5/21/14 <1.0 <1.0 <1.0 <1.0 244 6.01
3rd Qtr 8/13/14 <1.0 <1.0 <1.0 <1.0 26 5.30
4th Qtr 10/23/14 <1.0 <1.0 <1.0 <1.0 26.7 6.07
1st Qtr 3/11/15 <1.0 <1.0 <1.0 <1.0 26.2 6.64
2nd Qtr 6/10/15 <1.0 <1.0 <1.0 <1.0 27.5 5.71
Duplicate TW4-65 <1.0 <1.0 <1.0 <1.0 27.5 3.94
3rd Qtr 8/13/15 <1.0 <1.0 <1.0 <1.0 27.4 3.88
4th Qtr 10/21/15 <1.0 <1.0 <1.0 <1.0 25.6 5.37
1st Qtr 3/15/16 <1.0 <1.0 <1.0 <1.0 32.8 5.83
2nd Qtr 5/25/16 <1.0 <1.0 <1.0 <1.0 27.9 5.65
3rd Qtr 7/27/16 <1.0 <1.0 <1.0 <1.0 26.5 6.10
4th Qtr 10/19/16 <1.0 <1.0 <1.0 <1.0 29.5 6.00
As_ofMarch 2012 both north _and south_wi]d lifeponds nojonger receiving water.
NA = not analyzed
Shaded indicates concentrations exceeding GWQS.
TABLE 1 (7 of 29)
Historic Summary Of Monitoring Parameters Up To The 4th Quarter 2016
Chloroform Contamination Investigation
DUSA White Mesa Mill
Well
Sampling Event
Parameter
(GWQS)
Carbon Tetrachloride
(5 pg/L)
Chloroform
(70 pg/L)
Chloromethane
(30 pg/L)
Methylene Chloride
(5 pg/L)
Chloride
No GWQS (mg/L)
Nitrate, Nitrate + Nitrite
(10 mg/L)
TW4-4 (chloroform pumping
well stared in 1st qtr 2010)
1st Qtr 3/16/05 NA 3,100 NA NA NA 10.0
2nd Qtr 5/25/05 NA 2,400 NA NA NA 11.3
3rd Qtr 8/31/05 <10 3,200 <10 <10 NA 9.9
4th Qtr 12/7/05 <50 2,800 <50 <50 54 10.2
1st Qtr 3/9/06 <50 2,900 <50 <50 51 9.5
2nd Qtr 6/14/06 <50 2,600 <50 <50 48 8 6
3rd Qtr 7/20/06 <50 2,850 <50 <50 50 9.7
4th Qtr 11/8/06 1.7 2,670 <1.0 <1.0 49 10.1
1st Qtr 2/28/07 1.5 2,200 <1.0 <1.0 49 9.0
2nd Qtr 6/27/07 1.7 2,400 <1.0 <1.0 47 9.4
3rd Qtr 8/15/07 1.5 2,700 <1.0 <1.0 45 9.5
4th Qtr 10/10/07 1.5 2,500 <1.0 <1.0 47 9.5
1st Qtr 3/28/08 1.6 2,800 <1.0 <1.0 43 9.2
2nd Qtr 6/25/08 1.5 2,500 <1.0 <1.0 42 10.8
3rd Qtr 9/10/08 1.4 2,200 <1.0 <1.0 39 8.8
4th Qtr 10/15/08 NA NA NA NA 44 10.1
4th Qtr 11/18/09 <2.0 2,500 <2.0 <2.0 NA NA
1st Qtr 3/4/09 1.2 2,200 <1.0 <1.0 37 10.2
2nd Qtr 6/23/09 1.2 1,800 <1.0 <1.0 34 8 2
3rd Qtr 9/14/09 1.1 2,000 <1.0 <1.0 39 8.4
4th Qtr 12/29/09 1.1 950 <1.0 <1.0 41 7.6
(2)1st Qtr 2/17/10 1 1,700 <1.0 <1.0 48 6.6
2nd Qtr 6/14/10 1.2 1,700 <1.0 <1.0 35 7.6
3rd Qtr 8/10/10 1.3 2,100 <1.0 <1.0 36 7.3
4th Qtr 10/15/10 1.3 1,700 <1.0 <1.0 38 7.1
1st Qtr 2/23/11 1.4 1,800 <1.0 <1.0 41 7.0
2nd Qtr 6/1/11 1.2 1,700 <1.0 <1.0 35 7.0
3rd Qtr 8/17/11 <1.0 1,500 <1.0 <1.0 40 6.6
4th Qtr 11/16/11 1 1,500 <1.0 <1.0 39 7.0
(iji'st Qtr 1/23/12 <1.0 1,200 <1.0 <1.0 38 7.1
2nd Qtr 6/6/12 <1.0 1,500 <1.0 <1.0 43 7.1
3rd Qtr 9/4/12 1.2 1,600 <1.0 <1.0 39 7.1
4th Qtr 10/3/12 1 1,400 <1.0 <1.0 38 7.0
1st Qtr 2/11/13 1 1,460 <1.0 <1.0 39 7.36
2nd Qtr 6/29/13 <1.0 1,330 <1.0 <1.0 39.6 6 30
3rd Qtr 9/3/13 1.2 1,380 <1.6 <1.0 38.8 7.22
4th Qtr 10/3/13 5.3 1,360 <1.0 <1.0 43.9 7.84
1st Qtr 1/27/14 3.88 1,260 <1.0 <1.0 37.4 7.28
2nd Qtr 5/19/14 4.94 1,220 <1.0 <1.0 47.5 5.91
3rd Qtr 8/11/14 4.94 1,320 7.1 <1.0 40 5.3
4th Qtr 10/21/14 <1.0 1,130 <1.0 <1.0 40 7.02
1st Qtr 3/9/15 1.05 1,350 <1.0 <1.0 37.6 7.7
2nd Qtr 6/10/15 <1.0 1,280 <1.0 <1.0 41.3 6.33
3rd Qtr 8/31/15 <1.0 1,220 1.72 <1.0 45.8 6.45
4th Qtr 10/19/15 <1.0 1,190 <1.0 <1.0 38.5 6.27
1st Qtr 3/9/16 <1.0 1,190 <1.0 <1.0 39.7 6.7
2nd Qtr 5/23/16 1.21 1,780 <1.0 <1.0 41.9 6.56
3rd Qtr 7/27/16 <1.0 1,380 <1.0 <1.0 40.2 7.22
4th Qtr 10/13/16 <1.0 1,430 <1.0 <1.0 40.3 6.77
_(1] As_of_Mar<* 2012 bom north_and south_wild lifeponds no longer receiving water.
_(2) Chloroform_pum£ing well_stared_injst_qm ZOIO^. _
NA = not analyzed
Shaded indicates concentrations exceeding GWQS.
Bold and italics indicates the MDL exceeded the GWQS.
TABLE 1 (8 of 29)
Historic Summary Of Monitoring Parameters Up To The 4th Quarter 2016
Chloroform Contamination Investigation
DUSA White Mesa Mill
Well
Sampling Event
Parameter
(GWQS)
Carbon Tetrachloride
(5 pg/L)
Chloroform
(70 pg/L)
Chloromethane
(30 pg/L)
Methylene Chloride
(5 pg/L)
Chloride
No GWQS (mg/L)
Nitrate, Nitrate + Nitrite
(10 mg/L)
TW4-5
1st Qtr 3/16/05 NA 120 NA NA NA 4.9
2nd Qtr 5/25/05 NA 113 NA NA NA 3.7
3rd Qtr 8/31/05 <2 5 82 5.8 <2.5 NA 6.0
4th Qtr 12/7/05 <2 5 63 2.5 <2.5 56 6.0
1st Qtr 3/9/06 <2.5 66 3.1 <2.5 52 6.0
2nd Qtr 6/14/06 <2.5 51 3.1 <2.5 51 5.9
3rd Qtr 7/20/06 <1.0 53.7 <1.0 <1.0 54 6.7
4th Qtr 11/8/06 <1.0 47.1 <1.0 <1.0 55 2.9
1st Qtr 2/28/07 <1.0 35 <1.0 <1.0 57 7.8
2nd Qtr 6/27/07 <1.0 26 <1.0 <1.0 45 7.0
3rd Qtr 8/15/07 <1.0 9.2 <1.0 <1.0 38 7.7
4th Qtr 10/10/07 <1.0 9.4 <1.0 <1.0 39 8.2
1st Qtr 3/28/08 <1.0 11 <1.0 <1.6.....36 7.4
2nd Qtr 6/25/08 <1.0 9.3 <1.0 <1.0 37 8.7
3rd Qtr 9/10/08 <1.0 11 <1.0 <1.0 34 7.9
4th Qtr 10/15/08 <1.0 10 <1.0 <1.0 37 9.3
1st Qtr 3/4/09 <1.0 12 <1.0 <1.0 34 7.9
2nd Qtr 6/23/09 <1.0 13 <1.0 <1.0 37 7.5
3rd Qtr 9/14/09 <1.0 12 <1.0 <1.0 48 8.3
4th Qtr 12/29/09 <1.0 8.5 <1.0 <1.0 41 7.5
1st Qtr 2/25/10 <1.0 13 <1.0 <1.0 43 68
2nd Qtr 6/14/10 <1.0 12 <1.0 <1.0 28 7.1
3rd Qtr 8/11/10 <1.0 12 <1.0 <1.0 38 7.0
4th Qtr 10/15/10 <1.0 11 <1.0 <1.0 41 7.2
1st Qtr 2/22/11 <1.0 10 <1.0 <1.0 34 7.0
2nd Qtr 5/26/11 <1.0 9 <1.0 <1.0 35 7.2
3rd Qtr 8/7/11 <1.0 10 <1.0 <1.0 37 7.5
4th Qtr 11/16/11 NA NA NA NA 30 6.0
i <1) 12/7/11 <1.0 7.9 <1.0 <1.0 NA NA I
(2)1st Qtr 1/18/12 <1.0 7.6 <1.0 <1.0 22 5.8
2nd Qtr 6/6/12 <1.0 8.4 <1.0 <1.0 39 8.0
3rd Qtr 9/11/12 <1.0 12 <1.0 <1.0 37 8.1
4th Qtr 10/3/12 <1.0 8 <1.0 <1.0 38 7.7
1st Qtr 2/13/13 <1.0 10.8 <1.0 <1.0 34.3 8.24
2nd Qtr 6/13/13 <1.0 11.2 <1.0 <1.0 36.5 10.70
3rd Qtr 9/5/13 <1.0 11.6 <1.0 <1.0 39.1 7.79
4th Qtr 11/13/13 <1.0 144 <1.0 <1.0 41.1 7.75
1st Qtr 1/30/14 <1.0 12.5 <1.0 <1.0 40.5 9.16
2nd Qtr 5/22/14 <1.0 13.4 <1.0 <1.0 51.4 7.78
3rd Qtr 8/14/14 <1.0 12.0 <1.0 <1.0 44 7.2
4th Qtr 11/13/14 <1.0 14.6 <1.0 <1.0 45.1 8.31
1st Qtr 3/12/15 <1.0 13.8 <1.0 <1.0 45.1 9.32
Duplicate TW4-70 <1.0 13.8 <1.0 <1.0 46.4 8.81
2nd Qtr 6/10/15 <1.0 13.3 1.07 <1.0 47.3 7.08
3rd Qtr 9/3/15 <1.0 12.9 <1.0 <1.0 52.2 8.1
4th Qtr 10/28/15 <1.0 11 <1.0 <1.0 43.6 8.03
1st Qtr 3/17/16 <1.0 11 <1.0 <1.0 44.7 10.2
2nd Qtr 5/23/16 <1.0 14 <1.0 <1.0 45.9 8.98
3rd Qtr 8/3/16 <1.0 11 <1.0 <1.0 44.6 8.49
4th Qtr 10/26/16 <1.0 9.9 <1.0 <1.0 47.8 8.32
Duplicate TW4-75 <1.0 12.0 <1.0 <1.0 49.5 8.34
(1) VOCs were resampled because laboratory missed holding time.
.0 Asof_March 2012 both north _andsoi£i_wild lifeponds no Jonger receiving water
NA = not analyzed
Shaded indicates concentrations exceeding GWQS.
TABLE 1 (9 of 29)
Historic Summary Of Monitoring Parameters Up To The 4th Quarter 2016
Chloroform Contamination Investigation
DUSA White Mesa Mill
Well Parameter
Sampling Event (GWQS)
Carbon Tetrachloride Chloroform Chloromethane Methylene Chloride Chloride Nitrate, Nitrate + Nitrite
(5 pg/L)(70 pg/L)(30 pg/L)(5 pg/L) No GWQS (mq/L)(10 mg/L)
TW4-6
1st Qtr 3/16/05 NA <1.0 NA NA NA 0.2
2nd Qtr 5/25/05 NA 2.5 NA NA NA 0.4
3rd Qtr 8/31/05 <1.0 10 2.8 <1.0 NA 0.8
4th Qtr 12/7/05 <1.0 17 1.3 <1.0 32 0,9
1st Qtr 3/9/06 <1.0 31 <1.0 <1.0 31 1.2
2nd Qtr 6/14/06 <1.0 19 <1.0 <1.0 30 1.0
3rd Qtr 7/20/06 <1.0 11 <1.0 <1.0 37 06
4th Qtr 11/8/06 <1.0 42.8 <1.0 <1.0 65 1.4
1st Qtr 2/28/07 <1.0 46 <1.0 <1.0 32 1.8
2nd Qtr 6/27/07 <1.0 11 <1.0 <1.0 38 0.6
3rd Qtr 8/15/07 <1.0 18 <1.0 <1.0 36 0.7
4th Qtr 10/10/07 <1.0 18 <1.0 <1.0 35 0 8
1st Qtr 3/28/08 <1.0 52 <1.0 <1.6 33 1.1
2nd Qtr 6/25/08 <1.0 24 <1.0 <1.0 35 0.9
3rd Qtr 9/10/08 <1.0 39 <1.0 <1.0 35 1.1
4th Qtr 10/15/08 <1.0 37 <1.0 <1.0 33 1.0
1st Qtr 3/11/09 <1.0 81 <1.0 <1.0 35 2.2
2nd Qtr 6/23/09 <1.0 120 <1.0 <1.0 37 2.7
3rd Qtr 9/14/09 <1.0 280 <1.0 <1.0 37 5.0
4th Qtr 12/29/09 <1.0 250 <1.0 <1.0 41 6.1
(5)1st Qtr 2/25/10 <1.0 1000 <1.0 <1.0 45 1.8
2nd Qtr 6/14/10 <1.0 590 <1.0 <1.0 33 2.5
3rd Qtr 8/11/10 <1.0 630 <1.0 <1.0 31 3 9
4th Qtr 10/15/10 <1.0 420 <1.0 <1.0 41 4.3
1st Qtr 2/23/11 <1.0 47 <10 <’i.6 40 0.7
2nd Qtr 5/26/11 <1.0 96 <1.0 <1.0 42 0.3
3rd Qtr 8/17/11 <1.0 16 <1.0 <1.0 39 03
4th Qtr 11/16/11 NA NA NA NA 36 0.8
(,) 12/7/11 <1.0 21 <1.0 <1.0 NA NA
<2) 11/16/11 <1.0 50 <1.0 <1.0 33 0.8
(4)1st Qtr 1/18/12 <1.0 38 <1.0 <1.0 38 0.7
2nd Qtr 6/13/12 <1.0 4.7 <1.0 <1.0 40 0.2
3rd Qtr 9/11/12 <1.0 6.9 <1.0 <1.0 21 0.1
4th Qtr 10/3/12 <1.0 9 <1.0 <1.0 41 0.2
1st Qtr 2/13/13 <1.0 6 89 <1.0 <1.0 40.4 0.2
2nd Qtr 6/13/13 <1.0 4.86 <1.0 <1.0 37.9 0.2
3rd Qtr 9/5/13 <1.0 5.93 <1.0 <1.0 40.6 0.2
4th Qtr 11/13/13 <1.0 5.51 <1.0 <1.0 402 1.5
1st Qtr 1/29/14 <1.0 5.7 <1.0 <1.0 406 0.2
2nd Qtr 5/22/14 <1.0 10.3 <1.0 <1.0 37 0.3
3rd Qtr 8/14/14 <1.0 202 <1.0 <1.0 40 4.2
(3)3rd Qtr 9/24/14 <1.0 260 <1.0 <1.0 NA NA
4th Qtr 10/29/14 <1.0 723 <1.0 <1.0 41.1 6 9
1st Qtr 3/12/15 <1.0 1,180 <1.0 <1.0 41.2 5.3
2nd Qtr 6/10/15 <1.0 1,040 <1.0 <1.0 41.6 5.9
3rd Qtr 9/10/15 <1.0 1,040 <10 <1.0 47 6 8
4th Qtr 10/29/15 <1.0 843 <1.0 <1.0 40.2 56
1st Qtr 3/22/16 <1.0 834 <1.0 <1.0 42.3 6.79
2nd Qtr 6/8/16 <1.0 486 <1.0 <1.0 44.1 3.19
3rd Qtr 7/27/16 <1.0 433 <1.0 <1.0 42.2 3.85
4th Qtr 10/26/16 <1.0 301 <1.0 <1.0 46.1 3.74
(1) VOCs were resampled because laboratory missed holding time.
(2) Results of the TW4-70 the duplicate sample for TW4-6
(3) Reanalyzed for VOCs only
(4J AsofMarch 2012 both north and south wild life_£onds no jonger receiving water.
jS) ChJoroformpum£ing well TW4-4 located appoximately Sstared in 1st qtr 2010)
NA = not analyzed
Shaded indicates concentrations exceeding GWQS.
TABLE 1 (10 of 29)
Historic Summary Of Monitoring Parameters Up To The 4th Quarter 2016
Chloroform Contamination Investigation
DUSA White Mesa Mill
Well
Sampling Event
Parameter
(GWQS)
Carbon Tetrachloride
(5 pg/L)
Chloroform
(70 pg/L)
Chloromethane
(30 pg/L)
Methylene Chloride
(5 pg/L)
Chloride
No GWQS (mq/L)
Nitrate, Nitrate + Nitrite
(10 mg/L)
TW4-7
1st Qtr 3/16/05 NA 3,100 NA NA NA 52
2nd Qtr 5/25/05 NA 2,700 NA NA NA 54
3rd Qtr 8/31/05 <10 3,100 <10 <10 NA 5.2
4th Qtr 12/7/05 <50 2,500 <50 <50 52 5.3
1st Qtr 3/9/06 <50 1,900 <50 <50 48 1
2nd Qtr 6/14/06 <50 2,200 <50 <50 47 4.5
3rd Qtr 7/20/06 <50 2,140 <50 <50 51 4.7
4th Qtr 11/8/06 1.5 2,160 <1.0 <1.0 49 4.6
1st Qtr 2/28/07 1.1 1,830 <1.0 <1.0 47 6
2nd Qtr 6/27/07 1.5 2,600 <1.0 <1.0 45 5.1
3rd Qtr 8/15/07 1.4 2,300 <1.0 <1.0 44 4.7
4th Qtr 10/10/07 1.2 1,900 <1.0 <1.0 45 4.7
1st Qtr 3/28/08 1.3 2,200 <1.0 <1.0 43 4.2
2nd Qtr 6/25/08 1.3 1,800 <1.0 <1.0 43 4 8
3rd Qtr 9/10/08 1.4 1,600 <1.0 <1.0 35 4.16
4th Qtr 10/15/08 NA NA NA NA 40 4.01
11/18/08 <2.0 2,500 <2.0 <2.0 NA NA
1st Qtr 3/11/09 1.2 1,800 <1.0 <1.0 35 3.7
2nd Qtr 6/23/09 <1.0 1,400 <1.0 <1.0 37 3.8
3rd Qtr 9/14/09 1 1,500 <1.0 <1.0 37 4.1
4th Qtr 12/29/09 <1.0 1,300 <1.0 <1.0 37 4.2
1st Qtr 3/3/10 <1.0 1,200 <1.0 <1.0 35 3.8
2nd Qtr 6/14/10 <1.0 1,100 <1.0 <1.0 31 3.9
3rd Qtr 8/11/10 1 1,500 <1.0 <1.0 36 3.9
4th Qtr 10/15/10 <1.0 1,100 <1.0 <1.0 38 4
1st Qtr 2/23/11 <1.0 1,300 <1.0 <1.0 45 3.6
2nd Qtr 6/1/11 <1.0 1,200 <1.0 <1.0 35 4.0
3rd Qtr 8/18/11 <1.0 1,200 <1.0 <1.0 37 4.1
4th Qtr 11/29/11 <1.0 1,000 <1.0 <1.0 37 3.8
(1)1st Qtr 1/19/12 <1.0 1,000 <1.0 <1.0 37 39
2nd Qtr 6/14/12 <1.0 790 <1.0 <1.0 41 4.0
3rd Qtr 9/13/12 <1.0 870 <1.0 <1.0 40 3 8
4th Qtr 10/4/12 <1.0 940 <1.0 <1.0 41 38
1st Qtr 2/13/13 <1.0 940 <1.0 <1.0 37.7 3.51
2nd Qtr 6/18/13 <1.0 953 <1.0 <1.0 39.3 4
3rd Qtr 9/12/13 <1.0 1,040 <1.0 <1.0 364 4.17
4th Qtr 11/14/13 <1.0 1,050 <1.0 <1.0 37.2 4.13
1st Qtr 2/5/14 5.41 946 <1.0 <1.0 38.2 424
2nd Qtr 5/22/14 4.78 847 <1.0 <1.0 37.7 4.19
3rd Qtr 8/27/14 <1.0 857 1.5 <1.0 39 2.9
4th Qtr 10/30/14 <1.0 926 <1.0 <1.0 40.2 3.68
1st Qtr 3/18/15 <1.0 942 <1.0 <1.0 40.4 4.25
2nd Qtr 6/11/15 <1.0 950 <1.0 <1.0 42.1 2.62
3rd Qtr 9/10/15 <1.0 897 <1.0 <1.0 46.7 4.72
4th Qtr 10/29/15 <1.0 847 <1.0 <1.0 40.6 3.49
1st Qtr 3/22/16 <1.0 834 <1.0 <1.0 42.4 4.43
2nd Qtr 6/8/16 <1.0 909 <1.0 <1.0 44.1 3.75
3rd Qtr 8/4/16 <1.0 1,000 <1.0 <1.0 42.3 4.21
4th Qtr 10/26/16 <1.0 886 <1.0 <1.0 45.8 4.33
Sll As^of_March 2012 both north_and soi^tvwild lifeponds nojonger receiving water
NA = not analyzed
Shaded indicates concentrations exceeding GWQS.
Bold and italics indicates the MDL exceeded the GWQS.
TABLE 1 (11 of 29)
Historic Summary Of Monitoring Parameters Up To The 4th Quarter 2016
Chloroform Contamination Investigation
DUSA White Mesa Mill
Well Parameter
Sampling Event (GWQS)
Carbon Tetrachloride Chloroform Chloromethane Methylene Chloride Chloride Nitrate, Nitrate + Nitrite
(5 pg/L)(70 pg/L)(30 pg/L)(5 pg/L) No GWQS (mg/L)(10 mg/L)
TW4-8
1st Qtr 3/16/05 NA 10 NA NA NA <0.1
2nd Qtr 5/25/05 NA <1.0 NA NA NA 0.2
3rd Qtr 8/31/05 <1.0 1.1 1.7 NA NA <1.0
4th Qtr 12/7/05 <1.0 <1.0 <10 <1.0 41 <1.0
1st Qtr 3/9/06 <1.0 1.3 2.1 <1.0 39 0 3
2nd Qtr 6/14/06 <1.0 1.8 1.0 <1.0 37 <1.0
3rd Qtr 7/20/06 <1.0 <1.0 <1,0 <1.0 39 0.1
4th Qtr 11/8/06 <1.0 <1.0 <1.0 <1.0 40 <1
1st Qtr 2/28/07 <1.0 2.5 <10 <1.0 39 0.7
2nd Qtr 6/27/07 <1.0 2.5 <1.0 <1.0 42 0.2
3rd Qtr 8/15/07 <1.0 1.5 <10 <1.0 42 <1.0
4th Qtr 10/10/07 <1.0 3.5 <1.0 <1.0 43 0.5
1st Qtr 3/28/08 <1.0 <1.0 <1.0 <1.0 46 0.1
2nd Qtr 6/25/08 <1.0 <1.0 <1.0 <1.0 45 <1.0
3rd Qtr 9/10/08 <1.0 <1.0 <1.0 <1.0 39 <0.05
4th Qtr 10/15/08 <1.0 <1.0 <1.0 <1.0 44 <0.05
1st Qtr 3/4/09 <1.0 <1.0 <1.0 <1.0 42 <0.1
2nd Qtr 6/23/09 <1.0 <1.0 <10 <1.0 44 <0.1
3rd Qtr 9/14/09 <1.0 <1.0 <1.0 <1.0 44 <0.1
4th Qtr 12/17/09 <1.0 <1.0 <1.0 <1.0 51 <0.1
1st Qtr 2/24/10 <1.0 <1.0 <1.0 <1.0 57 <0.1
2nd Qtr 6/14/10 <1.0 <1.0 <1.0 <1.0 42 <0.1
3rd Qtr 8/18/10 <1.0 <1.0 <1.0 <1.0 45 <0.1
4th Qtr 10/15/10 <1.0 <1.0 <1.0 <1.0 46 0.1
1st Qtr 2/16/11 <1.0 <1.0 <1.0 <1.0 52 <0.1
2nd Qtr 5/25/11 <1.0 <1.0 <1.0 <1.0 45 0.1
3rd Qtr 8/16/11 <1.0 <1.0 <1.0 <1.0 46 0.1
4th Qtr 11/16/11 45 0.2
(1)12/7/11 <1.0 <1.0 <1.0 <1.0 NA NA
(3)1st Qtr 1/18/12 <1.0 <1.0 <1.0 <1.0 45 0.3
2nd Qtr 5/13/12 <1.0 <1.0 <1.0 <1.0 44 0.2
3rd Qtr 8/29/12 <1.0 <1.0 <1.0 <1.0 48 0.1
4th Qtr 10/3/12 <1.0 <1.0 <1.0 <1.0 47 <0.1
1st Qtr 2/7/13 <1.0 <1.0 <10 <1.0 46.6 041
2nd Qtr 5/30/13 <10 <1.0 <1.0 <1.0 45.5 <0.1
3rd Qtr 9/5/13 <1.0 <1.0 <1.0 <1.0 47.5 0.1
4th Qtr 11/7/13 <1.0 <1.0 <1.0 <1.0 46.1 <0.1
1st Qtr 1/23/14 <1.0 63.8 <1.0 <1.0 48.5 0.166
(2)2/6/2014 <1.0 100 <1.0 <1.0 46.5 0.166
2nd Qtr 5/22/14 <1.0 122 <1.0 <1.0 53 0.538
3rd Qtr 8/27/14 <1.0 107 <1.0 <1.0 47 0.6
4th Qtr 10/29/14 <1.0 191 <1.0 <1.0 46.7 0.914
1st Qtr 3/12/15 <1.0 961 <1.0 <1.0 49.6 2 3
2nd Qtr 6/11/15 <1.0 981 <1.0 <1.0 53 1.88
3rd Qtr 9/10/15 <1.0 747 <1.0 <1.0 59.6 1.96
4th Qtr 10/29/15 <1.0 770 <1.0 <1.0 52 2.2
1st Qtr 3/17/16 <1.0 634 <1.0 <1.0 54.2 2.48
2nd Qtr 6/8/16 <1.0 595 <1.0 <1.0 58.7 2.14
3rd Qtr 8/4/16 <1.0 522 <1.0 <1.0 56.9 2.10
4th Qtr 10/27/16 <1.0 472 <1.0 <1.0 60.1 2.16
(1) VOCs were resampled because laboratory missed holding time.
(2) Resampled to verify chloroform concentration that was collected on 1/23/14.
J3) AsofMarch 2012 both north and south_wiJd lifejronds no Jonger receiving water,
NA = not analyzed
Shaded indicates concentrations exceeding GWQS.
TABLE 1 (12 of 29)
Historic Summary Of Monitoring Parameters Up To The 4th Quarter 2016
Chloroform Contamination Investigation
DUSA White Mesa Mill
Well
Sampling Event
Parameter
(GWQS)
Carbon Tetrachloride
(5 pg/L)
Chloroform
(70 pg/L)
Chloromethane
(30 pg/L)
Methylene Chloride
(5 pg/L)
Chloride
No GWQS (mq/L)
Nitrate, Nitrate + Nitrite
(10 mg/L)
TW4-9
1st Qtr 3/16/05 NA 3.8 NA NA NA 1.3
2nd Qtr 5/25/05 NA 1.2 NA NA NA 1.3
3rd Qtr 8/31/05 <1.0 <1.0 2.9 <1.0 NA 1.3
4th Qtr 12/7/05 <1.0 <1.0 <1.0 <1.0 42 1.3
1st Qtr 3/9/06 <1.0 <1.0 2.6 <1.0 38 1.5
2nd Qtr 6/14/06 <1.0 19 2.7 <1.0 39 1.5
3rd Qtr 7/20/06 <1.0 <1.0 <1.0 <1.0 41 0.9
4th Qtr 11/8/06 <1.0 <1.0 <1.0 <1.0 44 0.7
1st Qtr 2/28/07 <1.0 <1.0 <1.0 <1.0 44 06
2nd Qtr 6/27/07 <1.0 21 <1.0 <1.0 42 1.3
3rd Qtr 8/15/07 <1.0 9.5 <1.0 <1.0 38 1.8
4th Qtr 10/10/07 <1.0 8.7 <1.0 <1.0 40 2
1st Qtr 3/28/08 <1.0 1.3 <1.0 <1.0 35 2.1
2nd Qtr 6/25/08 <1.0 1 <1.0 <1.0 35 2.3
3rd Qtr 9/10/08 <1.0 <1.0 <1.0 <1.0 28 2 79
4th Qtr 10/15/08 <1.0 <1.0 <10 <1.0 58 1.99
1st Qtr 3/4/09 <1.0 <1.0 <1.0 <1.0 30 2.5
2nd Qtr 6/23/09 <1.0 <1.0 <1.0 <1.0 30 2.3
3rd Qtr 9/14/09 <1.0 <1.0 <1.0 <1.0 30 2.5
4th Qtr 12/17/09 <1.0 <1.0 <1.0 <1.0 37 1.7
1st Qtr 2/23/10 <1.0 <1.0 <1.0 <1.0 47 1.4
2nd Qtr 6/14/10 <1.0 <1.0 <1.0 <1.0 33 1.5
3rd Qtr 8/13/10 <1.0 <1.0 <1.0 <1.0 40 1.2
4th Qtr 10/15/10 <1.0 <1.0 <10 <1.0 34 1.8
1st Qtr 2/17/11 <1.0 <1.0 <1.0 <1.0 41 1.3
2nd Qtr 5/25/11 <1.0 <1.0 <1.0 <1.0 38 34
3rd Qtr 8/16/11 <1.0 <1.0 <1.0 <1.0 21 4
4th Qtr 11/16/11 NA NA NA NA 38 2.3
(1) 12/7/11 <1.0 <1.0 <1.0 <1.0 NA
(2)1st Qtr 1/18/12 <1.0 <1.0 <1.0 <1.0 28 23
2nd Qtr 5/31/12 <1.0 <1.0 <1.0 <1.0 23 4 0
3rd Qtr 8/30/12 <1.0 <1.0 <1.0 <1.0 22 3.9
4th Qtr 10/3/12 <1.0 <1.0 <1.0 <1.0 21 3.8
1st Qtr 2/7/13 <1.0 <1.0 <1.0 <1.0 20.6 4.49
2nd Qtr 5/30/13 <1.0 <1.0 <1.0 <1.0 21.4 449
3rd Qtr 9/5/13 <1.0 <1.0 <1.0 <1.0 22.7 4.03
4th Qtr 11/7/13 <1.0 <1.0 <1.0 <1.0 23.6 4.871st Qtr 1/29/14.....<1.0 <1.0 <1.0 <1.0 22 436
2nd Qtr 5/22/14 <1.0 6.9 <1.0 <1.0 24 344
3rd Qtr 8/14/14 <1.0 47 <1.0 <1.0 27 2.7
4th Qtr 10/29/14 <1.0 101 <1.0 <1,0 25 4.29
1st Qtr 3/12/15 <1.0 53.5 <1.0 <1.0 29.5 3 28
2nd Qtr 6/11/15 <1.0 35.1 <1.0 <1.0 35.3 1.83
3rd Qtr 9/3/15 <1.0 48 <1.0 <1.0 39.3 1 44
4th Qtr 10/28/15 <1.0 68.4 <1.0 <1.0 29.2 2.89
1st Qtr 3/17/16 <1.0 74.3 <1.0 <1.0 33 6 2.51
2nd Qtr 6/8/16 <1.0 76.2 <1.0 <1.0 35.1 2.16
3rd Qtr 8/3/16 <1.0 76.8 <1.0 <1.0 33.6 2.11
4th Qtr 10/26/16 <1.0 76.0 <1.0 <1.0 374 224
(1) VOCs were resampled because laboratory missed holding time.
(2] As^f^larch 2012 both north and south^wijd lifeponds nojonger receiving water.
NA = not analyzed
Shaded indicates concentrations exceeding GWQS.
TABLE 1 (13 of 29)
Historic Summary Of Monitoring Parameters Up To The 4th Quarter 2016
Chloroform Contamination Investigation
DUSA White Mesa Mill
Well
Sampling Event
Parameter
(GWQS)
Carbon Tetrachloride
(5 pg/L)
Chloroform
(70 pg/L)
Chloromethane
(30 pg/L)
Methylene Chloride
(5 pg/L)
Chloride
No GWQS (mg/L)
Nitrate, Nitrate + Nitrite
(10 mg/L)
TW4-10
1st Qtr 3/16/05 NA 140 NA NA NA 1.6
2nd Qtr 5/25/05 NA 62 NA NA NA 0.8
3rd Qtr 8/31/05 <2.5 110 6.2 <2.5 NA 1.1
4th Qtr 12/7/05 <2.5 300 <2.5 <2.5 52 3.3
1st Qtr 3/9/06 <5.0 190 <5.0 <5.0 50 2.4
2nd Qtr 6/14/06 <5.0 300 <5.0 <5.0 54 3.5
3rd Qtr 7/20/06 <5.0 504 <5.0 <5.0 61 6.8
4th Qtr 11/8/06 <1.0 452 1.6 <1.0 58 5.7
1st Qtr 2/28/07 <1.0 500 <1.0 <1.0.....2 7.3
2nd Qtr 6/27/07 <1.0 350 <1.0 <1.0 54 5.1
3rd Qtr 8/15/07 <1.0 660 <1.0 <1.0 59 7.3
4th Qtr 10/10/07 <1.0 470 <1.0 <1.0 59 6.7
1st Qtr 3/28/08 <1.0 620 <1.0 <1.0 55 7.3
2nd Qtr 6/25/08 <1.0 720 <1.0 <1.0 58 9 9
3rd Qtr 9/10/08 <1.0 660 <10 <1.0 51 9.23
4th Qtr 10/15/08 NA NA NA NA 61 10.5
11/18/08 <2.0 1,200 <2.0 <2.0 NA NA
1st Qtr 3/11/09 <1.0 1,100 <1.0 <1.0 64 11.6
2nd Qtr 6/23/09 <1.0 1,200 <1.0 <1.0 62 9.8
3rd Qtr 9/14/09 <1.0 910 <1.0 <1.0 51 8.1
4th Qtr 12/22/09 <1.0 300 <1.0 <1.0 51 3.8
1st Qtr 3/3/10 <i.o 460 <1.0 <1.0 48 5.0
2nd Qtr 6/14/10 <1.0 220 <1.0 <1.0 42 1.6
3rd Qtr 8/12/10 <1.0 100 <1.0 <1.0 38 0,8
4th Qtr 10/15/10 <1.0 1,100 <1.0 <1.0 52 11.0
1st Qtr 2/23/11 <1.0 620 <1.0 <1.0 32 9.0
2nd Qtr 6/14/11 <1.0 280 <1.0 <1.0 42 3.3
3rd Qtr 8/17/11 <1.0 180 <1.0 <1.0 41 1.9
4th Qtr 11/16/11 <1.0 110 <1.0 <1.0 45 1.1
(1)1st Qtr 1/19/12 <1.0 76 <1.0 <1.0 40 0.9
2nd Qtr 6/14/12 <1.0 79 <1.0 <1.0 46 0.8
3rd Qtr 9/12/12 <1.0 130 <1.0 <1.0 44 1.0
4th Qtr 10/3/12 <1.0 140 <1.0 <1.0 45 1.6
1st Qtr 2/13/13 <1.0 154 <1.0 <1.0 49.1 1.2
2nd Qtr 6/13/13 <1.0 486 <1.0 <1.0 51.5 5.6
3rd Qtr 9/12/13 <1.0 1,126 <1.0 <1.0 67.9 13.0
4th Qtr 11/14/13 <1.0 1,380 <1.0 <1.0 70.9 16.0
1st Qtr 1/29/14 5.16 1,260 <1.0 <1.0 73 16.8
2nd Qtr 5/23/14 <1,0 1,110 <1.0 <1.0 77.3 13.9
3rd Qtr 8/27/14 <1.0 1,060 1.5 <1.0 74 9.8
4th Qtr 10/30/14 <1.0 1,220 <1.0 <1.0 75.2 13.2
1st Qtr 3/18/15 <1.0 1,210 <1.0 <1.0 78.6 15.0
2nd Qtr 6/11/15 <1.0 1,240 <1.0 <1.0 75 11.4
3rd Qtr 9/10/15 <1.0 1,280 <1.0 <1.0 89.5 14.0
4th Qtr 10/29/15 <1.0 1,350 <1.0 <1.0 79.9 13.5
1st Qtr 3/22/16 <1.0 1,430 <1.0 <1.0 84.1 17.3
2nd Qtr 6/8/16 <1.0 1,510 <1.0 <1.0 89.5 14.9
3rd Qtr 8/4/16 <1.0 1,500 <1.0 <1.0 85.3 14.9
4th Qtr 10/26/16 <1.0 1,290 <1.0 <1.0 844 14.8
_(1] As_ofMarch 2012 both north_and southwild |ife_gonds nojonger receiwig vrater.
NA = not analyzed
Shaded indicates concentrations exceeding GWQS.
TABLE 1 (14 of 29)
Historic Summary Of Monitoring Parameters Up To The 4th Quarter 2016
Chloroform Contamination Investigation
DUSA White Mesa Mill
Well
Sampling Event
Parameter
(GWQS)
Carbon Tetrachloride
(5 pg/L)
Chloroform
(70 pg/L)
Chloromethane
(30 pg/L)
Methylene Chloride
(5 pg/L)
Chloride
No GWQS (mg/L)
Nitrate, Nitrate + Nitrite
(10 mg/L)
TW4-11 (chloroform pumping
well started 1/14/15)
1st Qtr 3/16/05 NA 4,400 NA NA NA 8.7
2nd Qtr 5/25/05 NA 3,590 NA NA NA 10.3
3rd Qtr 8/31/05 <10 4,400 <10 <10 NA 9.4
4th Qtr 12/7/05 <100 4,400 <100 <100 58 94
1st Qtr 3/9/06 <50 4,400 <50 <50 56 9.2
2nd Qtr 6/14/06 <50 4,300 <50 <50 56 10.0
3rd Qtr 7/20/06 <50 4,080 <50 <50 55 10.0
4th Qtr 11/8/06 1.7 3,660 2.7 1.3 55 100
1st Qtr 2/28/07 1.3 3,600 <1.0 1.6 54 10.1
2nd Qtr 6/27/07 1.6 3,800 <1.0 <1.0 53 10.6
3rd Qtr 8/15/07 1.7 4,500 <10 <1.0 53 10.2
4th Qtr 10/10/07 1.6 4,400 <10 1.2 53 9.8
1st Qtr 3/28/08 <1.0 340 <1.0 <1.0 63 7.7
2nd Qtr 6/25/08 <1.0 640 <1.0 <1.0 46 7.3
3rd Qtr 9/10/08 <1.0 900 <1.0 <1.0 42 7.9
4th Qtr 10/15/08 NA NA NA NA 47 9.5
11/18/08 <2.0 1,000 <2.0 <2.0 NA NA
1st Qtr 3/11/09 <1.0 1,000 <1.0 <1.0 49 7.3
2nd Qtr 6/23/09 <1.0 980 <1.0 <1.0 44 6 8
3rd Qtr 9/14/09 <1.0 1,000 <1.0 <1.0 49 7.0
4th Qtr 12/29/09 <1.0 860 <1.0 <1.0 46 6.6
1st Qtr 3/3/10 <1.0 820 <1.0 <1.0 42 6 8
2nd Qtr 6/14/10 <1.0 820 <1.0 <1.0 40 6.9
3rd Qtr 8/12/10 <1.0 800 <1.0 <1.0 43 6.7
4th Qtr 10/15/10 <1.0 720 <10 <1.0 49 6.4
1st Qtr 2/23/11 <1.0 1,000 <1.0 <1.0 46 65
2nd Qtr 6/1/11 <1.0 930 <1.0 <1.0 49 7.3
3rd Qtr 8/17/11 <1.0 820 <1.0 <1.0 48 7.1
4th Qtr 11/16/11 <1.0 1500 <1.0 <1.0 46 7.1
(1)1st Qtr 1/24/12 <1.0 610 <1.0 <1.0 43 6.8
2nd Qtr 6/13/12 <1.0 660 <1.0 <1.0 52 6.7
3rd Qtr 9/13/12 <1.0 740 <1.0 <1.0 49 3.0
4th Qtr 10/3/12 <1.0 730 <1.0 <1.0 50 7.0
1st Qtr 2/13/13 3.23 867 <1.0 <1.0 47.3 6.8
2nd Qtr 6/18/13 <1.0 788 <1,0 <1.0 49.3 7.4
3rd Qtr 9/12/13 <1.0 865 <1.0 <1.0 46.6 7.8
4th Qtr 11/13/13 <1.0 874 <10 <1.0 46.7 8.01
1st Qtr 2/5/14 5.19 785 <10 <1.0 48.5 847
2nd Qtr 5/23/14 <1.0 751 <1.0 <1.0 51.6 6.92
3rd Qtr 8/27/14 <1.0 719 1.2 <1.0 48 5.4
4th Qtr 10/29/14 <1.0 803 <1.0 <1.0 56.4 7.33
(2)1st Qtr 3/9/15 1.24 2,450 <1.0 <1.0 49.8 8.72
2nd Qtr 6/11/15 <1.0 2,710 <1.0 <1.0 62.2 8.48
3rd Qtr 8/31/15 <1.0 1,120 <1.0 <1.0 73.1 9.61
4th Qtr 10/29/15 <1.0 2730 <1.0 <1.0 55.3 7.5
1st Qtr 3/9/16 1.2 2,660 <1.0 <1.0 55.5 7.13
2nd Qtr 5/23/16 2.19 3,340 <1.0 <1.0 56.4 7.81
3rd Qtr 7/25/16 <1.0 3,200 <1.0 <1.0 55.3 8.83
4th Qtr 10/12/16 <1.0 3,200 <1.0 <1.0 572 8.92
_(1] As_of_March 2012 both north_and sout_hwijd lifeponds no longer receiving water.
_(2] ChjorofomTjxjm£ing well_started_1/14/1^.___________
NA = not analyzed
Bold and italics indicates the MDL exceeded the GWQS.
Bold and italics indicates the MDL exceeded the GWQS.
TABLE 1(15 of 29)
Historic Summary Of Monitoring Parameters Up To The 4th Quarter 2016
Chloroform Contamination Investigation
DUSA White Mesa Mill
Well
Sampling Event
Parameter
(GWQS)
Carbon Tetrachloride
(5 pg/L)
Chloroform
(70 pg/L)
Chloromethane
(30 pg/L)
Methylene Chloride
(5 pg/L)
Chloride
No GWQS (mq/L)
Nitrate, Nitrate + Nitrite
(10 mg/L)
TW4-12
1st Qtr 3/16/05 NA <1.0 NA NA NA 1.4
2nd Qtr 5/25/05 NA <1.0 NA NA NA 1.6
3rd Qtr 8/31/05 <1.0 <1.0 5.8 <1.0 NA 1.5
4th Qtr 12/7/05 <1.0 <1.0 1.0 <1.0 19 1.4
1st Qtr 3/9/06 <1.0 <1.0 26 <1.0 19 1.3
2nd Qtr 6/14/06 <1.0 <1.0 1.4 <1.0 16 1.4
3rd Qtr 7/20/06 <1.0 <1.0 1.4 <1.0 16 1.4
4th Qtr 11/8/06 <1.0 <1.0 <1.0 <1.0 16 1.4
1st Qtr 2/28/07 <1.0 <1.0 <1.0 <1.0 16 1.5
2nd Qtr 6/27/07 <1.0 <1.0 <1.0 <1.0 18 1.5
3rd Qtr 8/15/07 <1.0 <1.0 <1.0 <1.0 29 1.4
4th Qtr 10/10/07 <1.0 <1.0 <1.0 <1.0 16 1.4
1st Qtr 3/28/08 <1.0 <1.0 <1.0 <1.0 16 1.6
2nd Qtr 6/25/08 <1.0 <1.0 <1.0 <1.0 19 2.7
3rd Qtr 9/10/08 <1.0 <1.0 <1.0 <1.0 18 2.7
4th Qtr 10/15/08 <1.0 <1.0 <10 <1.0 22 2.5
1st Qtr 3/11/09 <1.0 <1.0 <1.0 <1.0 23 2.4
2nd Qtr 6/23/09 <1.0 <1.0 <1.0 <1.0 22 3.8
3rd Qtr 9/14/09 <1.0 <1.0 <1.0 <1.0 22 5.1
4th Qtr 12/16/09 <1.0 <1.0 <1.0 <1.0 23 3.6
1st Qtr 2/23/10 <1.0 <1.0 <1.0 <1.0 22 4.0
2nd Qtr 6/14/10 <1.0 <1.0 <1.0 <1.0 29 11.0
3rd Qtr 8/10/10 <1.0 <1.0 <1.0 <1.0 35 9.0
4th Qtr 10/15/10 <1.0 <1.0 <1.0 <1.0 31 8.0
1st Qtr 2/15/11 <1.0 <1.0 <1.0 <1.0 31 6.5
2nd Qtr 5/25/11 <1.0 <1.0 <1.0 <1.0 32 7.0
3rd Qtr 8/16/11 <1.0 <1.0 <1.0 <1.0 31 6.8
4th Qtr 11/15/11 <1.0 <1.0 <1.0 <1.0 30 8.0
(1)1st Qtr 1/17/12 <1.0 <1.0 <1.0 <1.0 28 7.7
2nd Qtr 5/31/12 <1.0 <1.0 <1.0 <1.0 34 10.0
3rd Qtr 8/29/12 <1.0 <1.0 <1.0 <1.0 39 13.0
4th Qtr 10/3/12 <1.0 <1.0 <1.0 <1.0 39 13.0
1st Qtr 2/13/13 <1.0 <1.0 <1.0 <1.0 36.7 12.6
2nd Qtr 5/29/13 <1.0 <1.0 <1.0 <1.0 38.6 14.2
3rd Qtr 8/29/13 <1.0 <1.0 <1.0 <1.0 41.7 17.4
4th Qtr 11/6/13 <1.0 <1.0 <1.0 <1.0 41.4 16.4
1st Qtr 1/22/14 <1.0 <1.0 <16 <1.0 41.6 184
2nd Qtr 5/21/14 <1.0 <1.0 <1.0 <1.0 40.2 17.0
3rd Qtr 8/27/14 <1.0 <1.0 <1.0 <1.0 47 13.0
4th Qtr 10/23/14 <1.0 <1.0 <1.0 <1.0 50.2 16.1
1st Qtr 3/11/15 <1.0 <1.0 <1.0 <1.0 50.6 19.2
2nd Qtr 6/10/15 <1.0 <1.0 <1.0 <1.0 56 18.8
3rd Qtr 9/2/15 <1.0 <1.0 <1.0 <1.0 60.2 16.4
4th Qtr 10/21/15 <1.0 <1.0 <1.0 <1.0 51 18.0
Deplicate TW4-65 <1.0 <1.0 <1.0 <1.0 51.3 18.0
1st Qtr 3/15/16 <1.0 <1.0 <1.0 <1.0 56.2 34.8
2nd Qtr 5/25/16 <1.0 <1.0 <1.0 <1.0 66.4 30.7
Deplicate TW4-65 <1.0 <1.0 <1.0 <1.0 67 113.0
3rd Qtr 7/27/16 <1.0 <1.0 <1.0 <1.0 67.5 37.7
4th Qtr 10/12/16 <1.0 <1.0 <1.0 <1.0 72.6 25.8
(1] As of March 2012 both north and southwild lifeponds no longer receiving water
NA = not analyzed
Shaded indicates concentrations exceeding GWQS.
TABLE 1 (16 of 29)
Historic Summary Of Monitoring Parameters Up To The 4th Quarter 2016
Chloroform Contamination Investigation
DUSA White Mesa Mill
Well
Sampling Event
Parameter
(GWQS)
Carbon Tetrachloride
(5 pg/L)
Chloroform
(70 pg/L)
Chloromethane
(30 pg/L)
Methylene Chloride
(5 pg/L)
Chloride
No GWQS (mg/L)
Nitrate, Nitrate + Nitrite
(10 mg/L)
TW4-13
1st Qtr 3/16/05 NA <1.0 NA NA NA 4 2
2nd Qtr 5/25/05 NA <1.0 NA NA NA 4.3
3rd Qtr 8/31/05 <1.0 <1.0 3.1 <1.0 NA 4.6
4th Qtr 12/7/05 <1.0 <1.0 <1.0 <1.0 69 4.3
1st Qtr 3/9/06 <1.0 <1.0 1.7 <1.0 67 4.2
2nd Qtr 6/14/06 <1.0 <1.0 1.4 <1.0 66 4.9
3rd Qtr 7/20/06 <1.0 <1.0 <1.0 <1.0 65 4.3
4th Qtr 11/8/06 <1.0 <1.0 <10 <1.0 33 0.8
1st Qtr 2/28/07 <1.0 <1.0 <1.0 <16 59 4.0
2nd Qtr 6/27/07 <1.0 <1.0 <1.0 <1.0 59 4.6
3rd Qtr 8/15/07 <1.0 <1.0 <1.0 <1.0 58 4.4
4th Qtr 10/10/07 <1.0 <1.0 <1.0 <1.0 58 4.1
1st Qtr 3/28/08 <1.0 <1.0 <1.0 <1.0 54 3.8
2nd Qtr 6/25/08 <1.0 <1.0 <1.0 <1.0 58 4.2
3rd Qtr 9/10/08 <1.0 <1.0 <10 <1.0 50 4.3
4th Qtr 10/15/08 <1.0 <1.0 <1.0 <1.0 58 4.6
1st Qtr 3/4/09 <1.0 <1.0 <1.0 <1.0 58 3.7
2nd Qtr 6/23/09 <1.0 <1.0 <1.0 <1.0 57 1.2
3rd Qtr 9/14/09 <1.0 <1.0 <1.0 <1.0 63 4.7
4th Qtr 12/16/09 <1.0 <1.0 <1.0 <1.0 60 4.1
1st Qtr 2/24/10 <1.0 <1.0 <1.0 <1.0 53 4 3
2nd Qtr 6/14/10 <1.0 <1.0 <1.0 <1.0 53 5.2
3rd Qtr 8/10/10 <1.0 <1.0 <1.0 <1.0 55 56
4th Qtr 10/15/10 <1.0 <1.0 <1.0 <1.0 55 5.8
1st Qtr 2/15/11 <1.0 <1.0 <1.0 <1.0 60 5.5
2nd Qtr 5/25/11 <1.0 <1.0 <1.0 <1.0 56 64
3rd Qtr 8/16/11 <1.0 <1.0 <1.0 <1.0 60 5.2
4th Qtr 11/15/11 <1.0 <1.0 <1.0 <1.0 54 5.9
(1)1st Qtr 1/17/12 <1.0 <1.0 <1.0 <1.0 55 5.5
2nd Qtr 5/31/12 <1.0 <1.0 <1.0 <1.0 59 6 0
3rd Qtr 8/29/12 <1.0 <1.0 <1.0 <1.0 60 6.2
4th Qtr 10/3/12 <1.0 <1.0 <1.0 <1.0 60 5.9
1st Qtr 2/13/13 <1.0 <1.0 <1.0 <1.0 59.3 6.31
2nd Qtr 5/29/13 <1.0 <1.0 <1.0 <1.0 56 6.8
3rd Qtr 8/29/13 <1.0 <1.0 <1.0 <1.0 63.5 7.16
4th Qtr 11/6/13 <1.0 <1.0 <1.0 <1.0 58.5 6 48
1st Qtr 1/22/14 <1.0 <1.0 <1.0 <1.0 63.1 7.09
2nd Qtr 5/21/14 <1.0 <1.0 <1.0 <1.0 56.1 5.99
3rd Qtr 8/13/14 <1.0 <1.0 <1.0 <1.0 62 4.8
4th Qtr 10/23/14 <1.0 <1.0 <1.0 <1.0 66.1 6 28
1st Qtr 3/11/15 <1.0 <1.0 <1.0 <1.0 66.4 7.09
2nd Qtr 6/10/15 <1.0 <1.0 <1.0 <1.0 70.3 6.32
3rd Qtr 9/2/15 <1.0 <1.0 <1.0 <1.0 76.5 5.7
4th Qtr 10/21/15 <1.0 <1.0 <1.0 <1.0 65.5 5.78
1st Qtr 3/16/16 <1.0 <1.0 <1.0 <1.0 694 7.97
2nd Qtr 5/25/16 <1.0 <1.0 <1.0 <1.0 71.8 5.87
3rd Qtr 7/28/16 <1.0 <1.0 <1.0 <1.0 69.3 6.14
4th Qtr 10/19/16 <1.0 <1.0 <1.0 <1.0 70.9 6.20
(1j Asof_March 2012 both north jand south_wNd lifeponds no jonger^ receiving water.
NA = not analyzed
Shaded indicates concentrations exceeding GWQS.
TABLE 1 (17 of 29)
Historic Summary Of Monitoring Parameters Up To The 4th Quarter 2016
Chloroform Contamination Investigation
DUSA White Mesa Mill
Well
Sampling Event
Parameter
(GWQS)
Carbon Tetrachloride
(5 pg/L)
Chloroform
(70 pg/L)
Chloromethane
(30 pg/L)
Methylene Chloride
(5 pg/L)
Chloride
No GWQS (mg/L)
Nitrate, Nitrate + Nitrite
(10 mg/L)
TW4-14
1st Qtr 3/16/05 NS NS NS NS NS NS
2nd Qtr 5/25/05 NS NS NS NS NS NS
3rd Qtr 8/31/05 NS NS NS NS NS NS
4th Qtr 12/7/05 NS NS NS NS NS NS
1st Qtr 3/9/06 NS NS NS NS NS NS
2nd Qtr 6/14/06 NS NS NS NS NS NS
3rd Qtr 7/20/06 NS NS NS NS NS NS
4th Qtr 11/8/06 <1.0 NS <1.0 <1.0 37 2.4
1st Qtr 2/28/07 <1.0 <1.0 <1.0 <1.0 38 2.3
2nd Qtr 6/27/07 <1.0 <1.0 <1.0 <1.0 38 1.4
3rd Qtr 8/15/07 <1.0 <1.0 <1.0 <1.0 36 1.1
4th Qtr 10/10/07 <1.0 <1.0 <1.0 <1.0 38 0.8
1st Qtr 3/28/08 <1.0 <1.0 <1.0 <1.0 57 0.4
2nd Qtr 6/25/08 <1.0 <1.0 <1.0 <1.0 35 1.6
3rd Qtr 9/10/08 <1.0 <1.0 <1.0 <1.0 34 1.38
4th Qtr 10/15/08 <1.0 <1.0 <1.0 <1.0 40 0.76
1st Qtr 3/4/09 <1.0 <1.0 <i.6 <1.0 35 1.6
2nd Qtr 6/23/09 <1.0 <1.0 <1.0 <1.0 36 1.4
3rd Qtr 9/14/09 <1.0 <1.0 <1.0 <1.0 38 1.5
4th Qtr 12/16/09 <1.0 <1.0 <1.0 <1.0 34 1.4
1st Qtr 3/3/10 <1.0 <1.0 <1.0 <1.0 33 2.5
2nd Qtr 6/14/10 <1.0 <1.0 <1.0 <1.0 49 2.9
3rd Qtr 8/10/10 <1.0 <1.0 <1.0 <1.0 35 2.8
4th Qtr 10/15/10 <1.0 <1.0 <1.0 <1.0 29 2.9
1st Qtr 2/15/11 <1.0 <1.0 <1.0 <1.0 25 1.8
2nd Qtr 6/14/11 <1.0 <1.0 <1.0 <1.0 24 1.4
3rd Qtr 8/16/11 <1.0 <1.0 <1.0 <1.0 33 2.6
4th Qtr 11/15/11 <1.0 <1.0 <1.0 <1.0 15 1.7
(1)1st Qtr 1/17/12 <1.0 <1.0 <1.0 <1.0 20 1.9
2nd Qtr 6/14/12 <1.0 <1.0 <1.0 <1.0 35 3.3
3rd Qtr 8/29/12 <1.0 <1.0 <1.0 <1.0 37 3.9
4th Qtr 10/3/12 <1.0 <1.0 <1.0 <1.0 37 3.9
1st Qtr 2/7/13 <1.6 <1.0 <1.0 <1.0 35.2 4.6
2nd Qtr 5/29/13 <1.0 <1.0 <1.0 <1.0 38.6 4.4
3rd Qtr 8/29/13 <1.0 <1.0 <1.0 <1.0 37.6 4.51
4th Qtr 11/6/13 <1.0 <1.0 <1.0 <1.0 36.5 4.81
1st Qtr 1/22/14 <1.0 <1.0 <1.0 <1.0 35.5 5.92
2nd Qtr 5/21/14 <1.0 <1.0 <1.0 <1.0 32.5 4.87
3rd Qtr 8/13/14 <1.0 <1.0 <1.0 <1.0 38 4.1
4th Qtr 10/23/14 <1.0 <1.0 <1.0 <1.0 38.9 5.22
1st Qtr 3/12/15 <1.0 1.7 <1.0 <1.0 40.1 5.22
2nd Qtr 6/10/15 <1.0 1.82 <1.0 <1.0 41.8 3.55
3rd Qtr 9/3/15 <1.0 <1.0 <1.0 <1.0 42.4 2.77
4th Qtr 10/23/15 <1.0 1.46 <1.0 <1.0 40.6 2.45
1st Qtr 3/16/16 <1.0 4.49 <1.0 2.18 42.4 2.94
2nd Qtr 5/26/16 <1.0 6.15 <1.0 3.18 43.6 2.45
3rd Qtr 8/3/16 <1.0 5 <1.0 1.8 42.4 288
4th Qtr 10/20/16 <1.0 7.02 <1.0 1.59 45.6 286
.*1] As_0fMarch 2012 both north_and soi£h_wild lifeponds no Jonger receiving water.
NS = not sampled
Shaded indicates concentrations exceeding GWQS.
TABLE 1 (18 of 29)
Historic Summary Of Monitoring Parameters Up To The 4th Quarter 2016
Chloroform Contamination Investigation
DUSA White Mesa Mill
Well
Sampling Event
Parameter
(GWQS)
Carbon Tetrachloride
(5 pg/L)
Chloroform
(70 pq/L)
Chloromethane
(30 pg/L)
Methylene Chloride
(5 pg/L)
Chloride
No GWQS (mq/L)
Nitrate, Nitrate + Nitrite
(10 mq/L)
TW4-16
1st Qtr 3/16/05 NA 240 NA NA NA <0.1
2nd Qtr 5/25/05 NA 212 NA NA NA <0.1
3rd Qtr 8/31/05 <1.0 85 3.2 43 NA <o!i
4th Qtr 12/7/05 <1.0 14 2.6 5.9 64 1.4
1st Qtr 3/9/06 <1.0 39 1.1 21 60 3
2nd Qtr 6/14/06 <1.0 13 24 8.9 55 1.9
3rd Qtr 7/20/06 <1.0 5.2 <1.0 2.7 60 2.7
4th Qtr 11/8/06 <1.0 13.6 <1.0 9.2 62 5.6
1st Qtr 2/28/07 <1.0 8.7 <1.0 6.6 79 12.3
2nd Qtr 6/27/07 <1.0 2.6 <1.0 1.8 75 9.9
3rd Qtr 8/15/07 <1.0 7.1 <1.0 5.1 65 5.4
4th Qtr 10/10/07 <1.0 1.4 <1.0 1 69 44
1st Qtr 3/28/08 <1.0 11 <1.0 26 52 <0.1
2nd Qtr 6/25/08 <1.0 <1.0 <1.0 <1.0 58 1.5
3rd Qtr 9/10/08 <1.0 10 <1.0 14 71 10.5
4th Qtr 10/15/08 <1.0 3.9 <1.0 6.6 89 9.8
1st Qtr 3/4/09 <1.0 <1.0 <1.0 <1.0 73 9.6
2nd Qtr 6/23/09 <1.0 <1.0 <1.0 <1.0 76 8.9
3rd Qtr 9/14/09 <1.0 <1.0 <1.0 <1.0 79 8.8
4th Qtr 12/17/09 <1.0 <1.0 <1.0 <1.0 76 5.2
1st Qtr 2/24/10 <1.0 <1.0 <1.0 <1.0 77 4.2
2nd Qtr 6/14/10 <1.0 2.1 <1.0 <1.0 64 4.7
3rd Qtr 8/24/10 <1.0 4.3 <1.0 <1.0 72 4.6
4th Qtr 10/15/10 <1.0 3 <1.0 <1.0 71 3.3
1st Qtr 2/22/11 <1.0 15 <1.0 <1.0 86 7
2nd Qtr 5/26/11 <1.0 16 <1.0 <1.0 81 5
3rd Qtr 8/17/11 <1.0 9.2 <1.0 <1.0 63 1.7
4th Qtr 11/16/11 NA NA NA NA 38 0.4
(1) 12/7/11 <1.0 <1.0 <1.0 1.4 NA
(3)1st Qtr 1/18/12 <1.0 <1.0 <1.0 1.7 48 0.1
2nd Qtr 5/26/12 <1.0 <1.0 <1.0 <1.0 53 <0.1
3rd Qtr 8/30/12 <1.0 <1.0 <1.0 <1.0 59 <0.1
4th Qtr 10/3/12 <1.0 <1.0 <1.0 <1.0 59 <0.1
1st Qtr 2/7/13 <1.0 <1.6 <1.0 <1.0 58.1 <0.1
2nd Qtr 5/30/13 <1.0 <1.0 <1.0 4.21 49.8 <0.1
3rd Qtr 9/5/13 <1.0 <1.0 <1.0 <1.0 54.4 <0.1
4th Qtr 11/7/13 <1.0 13.4 <1.0 <1.0 56.6 1.37
1st Qtr 1/29/14 <1.0 6.93 <1.0 <1.0 66.8 3.16
2nd Qtr 5/22/14 <1.0 14.6 <1.0 <1.0 80.7 4.94
3rd Qtr 8/14/14 <1.0 229 <1.0 <1.0 80 5.1
(2)3rd Qtr 9/24/14 <1.0 371 <1.0 <1.0 NA NA
4th Qtr 10/29/14 <1.0 387 <1.0 <1.0 92.1 8.4
1st Qtr 3/12/15 <1.0 153 <1.0 <1.0 65 4.3
2nd Qtr 6/11/15 <1.0 65.3 <1.0 <1.0 61 1.06
3rd Qtr 9/3/15 <1.0 82 <10 <1.0 65.8 1.18
4th Qtr 10/28/15 <1.0 112 <1.0 <1.0 58.3 1.69
1st Qtr 3/17/16 <1.0 45.9 <1.0 <1.0 56.5 1.63
2nd Qtr 5/26/16 <1.0 93.4 <1.0 <1.0 61.3 1.89
3rd Qtr 8/3/16 <1.0 49 <1.0 <1.0 60 2.20
4th Qtr 10/26/16 <1.0 49 <1.0 <1.0 66.7 2.78
(1) VOCs were resampled because laboratory missed holding time.
(2) VOCs were resampled
(3) As of March 2012 both north and south wild life ponds no longer receiving water.
NA = not analyzed
Shaded indicates concentrations exceeding GWQS.
TABLE 1 (19 of 29)
Historic Summary Of Monitoring Parameters Up To The 4th Quarter 2016
Chloroform Contamination Investigation
DUSA White Mesa Mill
Well
Sampling Event
Parameter
(GWQS)
Carbon Tetrachloride
(5 pg/L)
Chloroform
(70 pg/L)
Chloromethane
(30 pg/L)
Methylene Chloride
(5 pg/L)
Chloride
No GWQS (mg/L)
Nitrate, Nitrate + Nitrite
(10 mg/L)
TW4-18
1st Qtr 3/16/05 NA 38 NA NA NA 14.1
2nd Qtr 5/25/05 NA 29.8 NA NA NA 12.9
3rd Qtr 8/31/05 <1.0 39 2.8 <1.0 NA 13.3
4th Qtr 12/7/05 <1.0 14 1.1 <1.0 41 7.3
1st Qtr 3/9/06 <1.0 12 1.6 <1.0 36 5.9
2nd Qtr 6/14/06 <1.0 12 2.7 <1.0 35 4.7
3rd Qtr 7/20/06 <1.0 10.8 <1.0 <1.0 35 6.1
4th Qtr 11/8/06 <1.0 12.5 <1.0 <1.0 34 5.7
1st Qtr 2/28/07 <1.0 9.2 <1.0 <1.0 30 5.1
2nd Qtr 6/27/07 <1.0 8 <1.0 <1.0 28 4.9
3rd Qtr 8/15/07 <1.0 8.9 <1.0 <1.0 32 5.0
4th Qtr 10/10/07 <1.0 7.4 <1.0 <1.0 27 4.4
1st Qtr 3/28/08 <1.0 6.4 <1.0 <1.0 23 0.7
2nd Qtr 6/25/08 <1.0 5.7 <1.0 <1.0 23 4.6
3rd Qtr 9/10/08 <1.0 8 <1.0 <1.0 26 4.9
4th Qtr 10/15/08 <1.0 9.4 <1.0 <1.0 30 5.2
1st Qtr 3/4/09 <1.0 11 <1.0 <1.0 29 5.2
2nd Qtr 6/23/09 <1.0 16 <1.0 <1.0 30 6.2
3rd Qtr 9/14/09 <1.0 13 <1.0 <1.0 26 5.9
4th Qtr 12/22/09 <1.0 8.2 <1.0 <1.0 30 5.4
1st Qtr 2/24/10 <1.0 69 <1.0 <1.0 41 5.1
2nd Qtr 6/14/10 <1.0 29 <1.0 <1.0 35 9.0
3rd Qtr 8/12/10 <1.0 29 <1.0 <1.0 37 9.0
4th Qtr 10/15/10 <1.0 30 <1.0 <1.0 50 10.0
1st Qtr 2/22/11 <1.0 39 <1.0 <1.0 52 10.0
2nd Qtr 5/26/11 <1.0 26 <1.0 <1.0 36 9.0
3rd Qtr 8/17/11 <1.0 29 <1.0 <1.0 23 4.6
4th Qtr 11/16/11 NA NA NA NA 23 6.3
<1) 12/7/11 <1.0 28 <1.0 <1.0 NA NA
(2)1st Qtr 1/18/12 <1.0 25 <1.0 <1.0 18 4.4
2nd Qtr 6/13/12 <1.0 24 <1.0 <1.0 30 6.6
3rd Qtr 9/11/12 <1.0 38 <1.0 <1.0 26 6.6
4th Qtr 10/3/12 <1.0 30 <1.0 <1.0 27 6.0
1st Qtr 2/13/13 <1.0 34.9 <1.0 <1.0 23.1 5.6
2nd Qtr 6/13/13 <1.0 37.9 <1.0 <1.0 22.9 8.9
3rd Qtr 9/5/13 <1.6 41 <1.0 <1.0 36.2 12.1
4th Qtr 11/13/13 <1.0 44.3 <1.0 <1.0 37.1 14.2
1st Qtr 1/30/14 <1.0 6.93 <1.0 <1.0 38.9 12.8
2nd Qtr 5/22/14 <1.0 6.93 <1.0 <1.0 47 12.2
3rd Qtr 8/14/14 <1.0 32.8 <1.0 <1.0 49 9.8
4th Qtr 10/28/14 <1.0 33 <1.0 <1.0 40.8 11.1
1st Qtr 3/12/15 <1.0 32 <1.0 <1.0 41.6 11.7
2nd Qtr 6/11/15 <1.0 30.5 <1.0 <1.0 43.5 9.69
3rd Qtr 9/3/15 <1.0 28.7 <1.0 <1.0 47.6 15.7
4th Qtr 10/28/15 <1.0 52.9 <1.0 <1.0 39.4 6.24
1st Qtr 3/17/16 <1.0 56.6 <1.0 <1.0 40.7 5.96
2nd Qtr 6/8/16 <1.0 60 <1.0 <1.0 43.8 5.45
3rd Qtr 8/3/16 <1.0 56.3 <1,0 <1.0 40.7 5.79
4th Qtr 10/26/16 <1.0 60.1 <1.0 <1.0 43.9 5.24
(1) VOCs were resampled because laboratory missed holding time.
(2) As of March 2012 both north and south wild life ponds no longer receiving water.
NA = not analyzed
Shaded indicates concentrations exceeding GWQS.
TABLE 1 (20 of 29)
Historic Summary Of Monitoring Parameters Up To The 4th Quarter 2016
Chloroform Contamination Investigation
DUSA White Mesa Mill
Well
Sampling Event
Parameter
(GWQS)
Carbon Tetrachloride
(5 pg/L)
Chloroform
(70 pg/L)
Chloromethane
(30 pg/L)
Methylene Chloride
(5 pg/L)
Chloride
No GWQS (mg/L)
Nitrate, Nitrate + Nitrite
(10 mg/L)
TW4-19 (chlorofrom
pumping well started 4/30/03)
1st Qtr 3/16/05 NA 2,200 NA NA NA 5.3
2nd Qtr 5/25/05 NA 1,200 NA NA NA 5.7
3rd Qtr 8/31/05 <5.0 1,400 <5.0 <5.0 NA 4.6
4th Qtr 12/7/05 <50 2,800 <50 <50 81 <0.1
1st Qtr 3/9/06 <50 1,200 <50 <50 86 4
2nd Qtr 6/14/06 <50 1,100 <50 <50 116 5.2
3rd Qtr 7/20/06 <50 1,120 <50 <50 123 4.3
4th Qtr 11/8/06 1.6 1,050 2.6 <1.0 134 4.6
1st Qtr 2/28/07 1.3 1,200 <1.0 <1.0 133 4
2nd Qtr 6/27/07 Did not sample
3rd Qtr 8/15/07 1.9 1,100 <1.0 <1.0 129 4.1
4th Qtr 10/10/07 1.9 1,100 <1.0 <1.0 132 4
1st Qtr 3/28/08 2.9 1,800 <10 <1.0 131 2.2
2nd Qtr 6/25/08 <1.0 1,000 <1.0 <1.0 128 28
3rd Qtr 9/10/08 8.6 3,600 <1.0 <1.0 113 35.2
4th Qtr 10/15/08 12 4,200 <1.0 <1.0 124 47.8
1st Qtr 3/4/09 1.2 1,100 <1.0 <1.0 127 3.2
2nd Qtr 6/23/09 1.2 990 <1.0 <1.0 132 2.4
3rd Qtr 9/14/09 15 6,600 <1.0 <1.0 43 <0.1
4th Qtr 12/22/09 16 4,700 <1.0 <1.0 124 26.7
1st Qtr 2/17/10 1.3 940 <1.0 <1.0 144 2
2nd Qtr 6/14/10 4.2 1,800 <1.0 <1.0 132 4.4
3rd Qtr 8/16/10 4.9 2,000 <1.0 <1.0 142 5.9
4th Qtr 10/15/10 1.3 1,200 <1.0 <1.0 146 2.7
1st Qtr 2/17/11 17 3,400 <1.0 <1.0 135 17.0
2nd Qtr 6/7/11 8.3 4,000 <1.0 <1.0 148 12.0
3rd Qtr 8/17/11 2.1 970 <1.0 <1.0 148 3.0
4th Qtr 11/17/11 148 5.0
(,) 12/5/11 5.4 2,200 <1.0 <1.0
(2)1 st Qtr 1/23/12 1.5 650 <1.0 <1.0 138 0.6
2nd Qtr 6/6/12 1.1 460 <1.0 <1.0 149 2.4
3rd Qtr 9/4/12 3.5 950 <10 <1.0 149 2.5
4th Qtr 10/3/12 4 1500 <1.0 <1.0 150 4.1
1st Qtr 2/13/13 5.15 4,210 <1.0 <1.0 164 8.0
2nd Qtr 6/5/13 5.15 2,070 <10 <1.0 148 3.0
3rd Qtr 9/3/13 20.7 8,100 <1.0 <1.0 179 17.6
4th Qtr 10/29/13 6.42 942 <1.0 <1.0 134 4.7
1st Qtr 1/27/14 4.05 586 <1.0 <1.0 134 1.6
2nd Qtr 5/19/14 5.51 810 <1.0 <1.0 152 1.3
3rd Qtr 8/11/14 1.9 1,410 8.3 <1.0 140 1.6
4th Qtr 10/21/14 4.8 4,310 <1.0 <1.0 130 4.7
1st Qtr 3/9/15 8.92 4,660 <1.0 <1.0 238 8.56
2nd Qtr 6/8/15 2.62 1,570 <1.0 <1.0 180 0.916
3rd Qtr 8/31/15 <1.0 7,860 7.78 <1.0 326 11.6
4th Qtr 10/19/15 12.2 7J340 5.46 <1.0 252 106
1st Qtr 3/9/16 13.5 7,780 1.4 <1.0 276 15.70
2nd Qtr 5/26/16 23.1 12,600 <1.0 <1.0 204 1.27
3rd Qtr 7/25/16 9.89 6,040 <1.0 <1.0 214 10.5
4th Qtr 10/13/16 10.8 6,640 <1.0 <1.0 200 10.0
(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 exceeding GWQS.
TABLE 1 (21 of 29)
Historic Summary Of Monitoring Parameters Up To The 4th Quarter 2016
Chloroform Contamination Investigation
DUSA White Mesa Mill
Well
Sampling Event
Parameter
(GWQS)
Carbon Tetrachloride
(5 pg/L)
Chloroform
(70 pg/L)
Chloromethane
(30 pg/L)
Methylene Chloride
(5 pg/L)
Chloride
No GWQS (mg/L)
Nitrate, Nitrate + Nitrite
(10 mg/L)
TW4-20 (chloroform
pumping well started 8/4/05)
1st Qtr 3/16/05 Monitor well was not installed
2nd Qtr 5/25/05 NA 39,000 NA NA NA 10.10
(3)3rd Qtr 8/31/05 <10 3,800 <10 <10 NA 2.90
4th Qtr 12/7/05 <250 19,000 <250 <250 131 1,80
1st Qtr 3/9/06 <500 9,200 <500 <500 120 3.80
2nd Qtr 6/14/06 <500 61,000 <500 <500 235 9.40
3rd Qtr 7/20/06 <1000 5,300 <1000 <1000 134 2.90
4th Qtr 11/8/06 7.1 11,000 1.9 2.2 124 3.50
1st Qtr 2/28/07 3.1 4,400 <1.0 1.1 124 4 20
2nd Qtr 6/27/07 2.2 1,800 <1.0 <1.0 112 2.30
3rd Qtr 8/15/07 3.5 5,200 <1.0 1.8 117 2.10
4th Qtr 10/10/07 6.8 9,000 <1.0 1.9 170 5.60
1st Qtr 3/28/08 9 13,000 <1.0 i.5 132 090
2nd Qtr 6/25/08 13 30,000 <1.0 1.2 191 8 00
3rd Qtr 9/10/08 15 21,000 <1.0 3.7 156 4.44
4th Qtr 10/15/08 NA NA NA NA 168 5.51
1st Qtr 3/4/09 5.7 8,200 <1.0 5.2 164 5.10
2nd Qtr 6/23/09 4.9 6,800 <1.0 4 2 164 2.90
3rd Qtr 9/14/09 8.4 13,000 <1.0 4.4 153 3.30
4th Qtr 12/14/09 14 15,000 <1.0 3.0 187 5.30
1st Qtr 2/17/10 2.7 3,500 <1.0 3.2 179 2.00
2nd Qtr 6/14/10 11 18,000 <1.0 3.7 200 5.60
3rd Qtr 8/16/10 12 15,000 <1.0 2.2 196 5.30
4th Qtr 10/15/10 20 24,000 <1.0 5.5 203 4.60
1st Qtr 2/23/11 27 31,000 <1.0 19.0 220 4.40
2nd Qtr 6/1/11 10 8,100 <1.0 2.1 177 4.80
3rd Qtr 8/17/11 7.3 3,800 <1.0 3.1 207 6.50
4th Qtr 11/16/11 7.2 7,900 <1.0 2.5 186 4.20
(2)1st Qtr 1/23/12 10 11000 <1.0 1.3 207 7.90
2nd Qtr 6/6/12 33 36,000 <1.0 <1.0 262 11.00
3rd Qtr 9/4/12 26 13,000 <1.0 <1.0 289 10.80
4th Qtr 10/3/12 22 19,000 <1.0 <1.0 302 11.00
1st Qtr 2/11/13 19.6 18,500 <1.0 1.21 252 9.07
2nd Qtr 6/5/13 32.5 26,300 <1.0 1.3 250 9.80
3rd Qtr 9/3/13 25.7 26,800 <1.0 2.14 260 865
4th Qtr 10/29/13 17.3 15,700 <1.0 1.37 272 9.64
1st Qtr 1/27/14 18.4 17,800 <1.0 2.04 254 7.56
2nd Qtr 5/19/14 22.1 22,100 2.31 3.98 269 5.95
3rd Qtr 8/11/14 14.1 12,400 55.2 2 2 299 4.30
4th Qtr 10/21/14 18.5 23,300 4 04 2.38 292 7.67
1st Qtr 3/9/15 20.8 19,900 4 85 1.38 290 9.80
2nd Qtr 6/8/15 16.2 17,600 13.4 1.73 296 5.76
3rd Qtr 8/31/15 15.1 17,000 12.3 <1.0 365 9.3
4th Qtr 10/19/15 14.5 17,000 10.8 1 293 6.23
1st Qtr 3/9/16 20.2 21,600 4.09 1.16 293 10.30
2nd Qtr 5/23/16 40.6 33,700 <1.0 <1.0 318 11.20
3rd Qtr 7/25/16 266 23,600 <1.0 <1.0 307 11.30
4th Qtr 10/12/16 244 21,300 <1.0 <1.0 301 11.40
.(1] _VOCs_were resampled berauseJaboratoi^msM^holdin^tima _
(2) As of March 2012 both north and south wild life ponds no longer receiving water.
_(3)£hJoroform_purn£ing well started 8/4/05.
NA = not analyzed
Bold and italics indicates the MDL exceeded the GWQS.
Shaded indicates concentrations exceeding GWQS.
TABLE 1 (22 of 29)
Historic Summary Of Monitoring Parameters Up To The 4th Quarter 2016
Chloroform Contamination Investigation
DUSA White Mesa Mill
Well
Sampling Event
Parameter
(GWQS)
Carbon Tetrachloride
(5 pg/L)
Chloroform
(70 pg/L)
Chloromethane
(30 pg/L)
Methylene Chloride
(5 pg/L)
Chloride
No GWQS (mg/L)
Nitrate, Nitrate + Nitrite
(10 mg/L)
TW4-21 (chloroform pumping
well 6/9/15)
1st Qtr 3/16/05 Monitor well was not installed
2nd Qtr 5/25/05 NA 192 NA NA NA 14.6
3rd Qtr 8/31/05 <5.0 78 <5.0 <5.0 NA 10.1
4th Qtr 12/7/05 <1.0 86 <1.0 <1.0 353 9.6
1st Qtr 3/9/06 <2.5 120 <2.5 <2.5 .....347 8 5
2nd Qtr 6/14/06 <2.5 120 <2.5 <2.5 318 10.2
3rd Qtr 7/20/06 <2.5 108 <2.5 <2.5 357 8.9
4th Qtr 11/8/06 2 139 <1,0 <1.0 296 8.7
1st Qtr 2/28/07 1.8 160 <1.0 <1.0 306 8.7
2nd Qtr 6/27/07 5.8 300 <1.0 <1.0 327 8.6
3rd Qtr 8/15/07 <1.0 140 <1.0 <1.0 300 8.6
4th Qtr 10/10/07 <1.0 120 <1,0 <1.0 288 8.3
1st Qtr 3/28/08 7 390 <1.0 <1.0 331 14.3
2nd Qtr 6/25/08 1.7 180 <1.0 <1.0 271 8.8
3rd Qtr 9/10/08 1.6 120 <1.0 <1.0 244 7.57
4th Qtr 10/15/08 NA NA NA NA 284 8.0
11/18/08 2 170 <2.0 <2.0 NA NA
1st Qtr 3/11/09 <1.0 180 <1.0 <1.0 279 8.3
2nd Qtr 6/23/09 <1.0 200 <1.0 <1.0 291 8.1
3rd Qtr 9/14/09 <1.0 200 <1.0 <1.6 281 9 2
4th Qtr 12/22/09 <1.0 160 <1.0 <1.0 256 8.4
1st Qtr 2/25/10 <1.0 170 <1.0 <1.0 228 8.4
2nd Qtr 614/10 <1.0..................................210 <1.0 <1.0 266 12.0
3rd Qtr 8/13/10 9.2 390 <1.0 <1.0 278 14.0
4th Qtr 10/15/10 1.2 200 <1.0 <1.0 210 7.0
1st Qtr 2/22/11 1.2 230 <1.0 <1.0 303 9.0
2nd Qtr 6/28/11 4.8 290 <1.0 <1.0 290 12.0
3rd Qtr 8/17/11 6.3 460 <1.0 <1.0 287 14.0
4th Qtr 11/16/11 287 13.0
(,) 12/7/11 6.7 390 <1.0 <1.0
(2)1st Qtr 1/19/12 6.4 420 <1.0 <1.0 228 15.6
2nd Qtr 6/13/12 5.4 400 <1.0 <1.0 285 11.0
3rd Qtr 9/13/12 6 410 <1.0 <1.0 142 13.0
4th Qtr 10/4/12 7 390 <1.0 <1.0 270 14.0
1st Qtr 2/13/13 5.25 282 <1.0 <1.0 221 11.8
2nd Qtr 6/18/13 3.49 328 <1.0 <1.0 243 13.8
3rd Qtr 9/13/13 2.13 244 <1.0 <1.0 207 10.3
4th Qtr 11/13/13 <1.0 204 <1.0 <1.0 206 9.0
1st Qtr 2/5/14 6.23 220 <1.0 2.04 200 11.4
2nd Qtr 5/22/14 4.73 240 <1.0 2.04 243 11.5
3rd Qtr 8/27/14 <1.0 204 <1.0 <1.0 230 7.1
4th Qtr 10/29/14 1.04 229 <1.0 <1.0 252 10.0
1st Qtr 3/12/15 1.75 292 <1.0 <1.0 255 10.9
(3)2nd Qtr 6/8/15 1.92 366 <1.0 <1.0 494 13.1
3rd Qtr 8/31/15 <1.0 281 <1.0 <1.0 499 14.7
4th Qtr 10/19/15 <1.0 339 <1.0 <1.0 413 14.3
1st Qtr 3/9/16 <1.0 390 <1.0 <1.0 452 14.6
2nd Qtr 5/23/16 <1.0 545 <1.0 <1.0 425 13.1
3rd Qtr 7/25/16 <1.0 456 <1.0 <1.0 457 16.5
4th Qtr 10/12/16 <1.0 456 <1.0 <1.0 439 13.5
(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, js] Chlorofom^um£ing weYstartedS/S/Ts"
NA = not analyzed
Shaded indicates concentrations exceeding GWQS.
TABLE 1 (23 of 29)
Historic Summary Of Monitoring Parameters Up To The 4th Quarter 2016
Chloroform Contamination Investigation
DUSA White Mesa Mill
Well
Sampling Event
Parameter
(GWQS)
Carbon Tetrachloride
(5 pg/L)
Chloroform
(70 pg/L)
Chloromethane
(30 pg/L)
Methylene Chloride
(5 pg/L)
Chloride
No GWQS (mg/L)
Nitrate, Nitrate + Nitrite
(10 mg/L)
TW4-22
(nitrate pumping well started
1/26/13)
1st Qtr 3/16/05 Monitor well was not installed
2nd Qtr 5/25/05 NA 340 NA NA NA 18.2
3rd Qtr 8/31/05 <5.0 290 <5.0 <5.0 NA 15.7
4th Qtr 12/7/05 <5.0 320 <5.0 <5.0 253 15.1
1st Qtr 3/9/06 <10 390 <10 <10 236 15.3
2nd Qtr 6/14/06 <10 280 <10 <10 221 14.3
3rd Qtr 7/20/06 <10 864 <10 <10 221 14.5
4th Qtr 11/8/06 <1.0 350 1.6 <1.0 236 15.9
1st Qtr 2/28/07 <1.0 440 <10 <1.0 347 20.9
2nd Qtr 6/27/07 <1.0 740 <1.0 <1.0 273 19.3
3rd Qtr 8/15/07 <1.0 530 <1.0 <1.0 259 19.3
4th Qtr 10/10/07 <1.0 440 <1.0 <1.0 238 18.8
1st Qtr 3/28/08 <1.0 1,400 <1.0 <1.0 519 39.1
2nd Qtr 6/25/08 <1.0 1,200 <1.0 <1.0 271 41.9
3rd Qtr 9/10/08 1.3 6,300 <1.0 <1.0 524 38.7
4th Qtr 10/15/08 NA NA NA NA 539 36.3
11/18/08 <2.0 630 <2.0 <2.0 NA NA
1st Qtr 3/11/09 <1.0 390 <1.0 <1.0 177 20.7
2nd Qtr 6/23/09 <1.0 730 <1.0 <1.0 177 20.6
3rd Qtr 9/14/09 <1.0 2,300 <1.0 <1.0 391 40.3
4th Qtr 12/29/09 <1.0 380 <1.0 <1.0 175 17.8
1st Qtr 3/3/10 <1.0 2,200 <1.0 <1.0 427 368
2nd Qtr 6/14/10 <1.0 540 <1.0 <1.0 134 19.0
3rd Qtr 8/24/10 <1.0 340 <1.0 <1.0 130 15.0
4th Qtr 10/15/10 <1.0 340 <1.0 <1.0 134 16.0
1st Qtr 2/22/11 1.2 1,300 <1.0 <1.0 114 18.0
2nd Qtr 6/1/11 <1.0 210 <1.0 <1.0 138 17.0
3rd Qtr 8/17/11 <1.0 450 <1.0 <1.0 120 15.0
4th Qtr 11/16/11 NA NA NA NA 174 19.0
(,) 12/7/11 <1.0 400 <1.0 <1.0 NA NA
(2)1st Qtr 1/19/12 <1.0 200 <1.0 <1.0 36 14.0
2nd Qtr 6/13/12 <1.0 120 <1.0 <1.0 35 12.8
3rd Qtr 9/12/12 <1.0 121 <1.0 <1.0 7.0
4th Qtr 10/4/12 <1.0 330 <1.0 <1.0 130 14.0
(3)1 st Qtr 2/11/13 3.24 10,600 <1.0 <1.0 130 58.0
2nd Qtr 6/5/13 3.35 12,500 <1.0 <1.0 586 50.2
3rd Qtr 9/3/13 3.25 9,640 <1.0 <1.0 487 29.7
4th Qtr 10/29/13 8.09 13,300 <1.0 <1.0 501 45.2
1st Qtr 1/27/14 6.06 12,100 <1.0 2.83 598 54.6
2nd Qtr 5/19/14 6.65 12,400 <1.0 <1.0 614 47.2
3rd Qtr 8/11/14 1.9 12,400 40 <1.0 540 41.5
4th Qtr 10/29/14 3.32 12,400 1.61 <1.0 596 54.9
1st Qtr 3/9/15 3.77 12,700 4 31 <1.0 675 69.2
2nd Qtr 6/8/15 2.42 8,050 3.42 <1.0 390 47.1
3rd Qtr 8/31/15 <1.0 7,810 5.47 <1.0 557 64.7
4th Qtr 10/19/15 3.32 7,530 5.1 <1.0 567 56.1
1st Qtr 3/9/16 <1.0 6,070 <1.0 <1.0 583 31.1
2nd Qtr 5/23/16 2.64 8,570 <1.0 <1.0 598 584
3rd Qtr 7/25/16 <1.0 5,840 <1.0 <1.0 619 61.3
4th Qtr 10/12/16 1.08 3,370 <1.0 <1.0 588 61.5
(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
_(3J £hloroform_purr£ing well started 1/26/13.
NA = not analyzed
Shaded indicates concentrations exceeding GWQS.
Bold and italics indicates the MDL exceeded the GWQS.
TABLE 1 (24 of 29)
Historic Summary Of Monitoring Parameters Up To The 4th Quarter 2016
Chloroform Contamination Investigation
DUSA White Mesa Mill
Well
Sampling Event
Parameter
(GWQS)
Carbon Tetrachloride
(5 pg/L)
Chloroform
(70 pg/L)
Chloromethane
(30 pg/L)
Methylene Chloride
(5 pg/L)
Chloride
No GWQS (mq/L)
Nitrate, Nitrate + Nitrite
(10 mg/L)
TW4-23
2nd Qtr 6/27/07 <1.0 <1.0 <1.0 <1.0 47 <0.1
3rd Qtr 8/15/07 <1.0 <1.0 <1.0 <1.0 46 <0.1
4th Qtr 10/10/07 <1.0 <1.0 <1.0 <1.0 43 <0.1
1st Qtr 3/28/08 <1.0 <1,0 <1.0 <1.0 41 <6.1
2nd Qtr 6/25/08 <1.0 <1.0 <1.0 <1.0 41 <0.1
3rd Qtr 9/10/08 <1.0 <1.0 <1.0 <1.0 35 <0.05
4th Qtr 10/15/08 NA NA NA NA 51 <0.05
11/18/08 <2.0 <2.0 <2.0 <2.0 NA NA
1st Qtr 3/4/09 <1.0 <1.0 <1.0 <1.0 41 <0.1
2nd Qtr 6/23/09 <1.0 <1.0 <1.0 <1.0 43 <0.1
3rd Qtr 9/14/09 <1.0 <1.0 <1.0 <1.0 43 <0.1 :
4th Qtr 12/16/09 <1.0 <1.0 <1.0 <1.0 37 <0.1
1st Qtr 2/24/10 <1.0 <1.0 <1.0 <1.0 45 <0.1
2nd Qtr 6/14/10 <1.0 <1.0 <1.0 <1.0 40 <0.1
3rd Qtr 8/24/10 <1.0 <1.0 <1.0 <1.0 40 <0.1
4th Qtr 10/15/10 <1.0 <1.0 <1.0 <1.0 ............................34 <0.1
1st Qtr 2/16/11 <1.0 <1.6 <1.6 <1.6 44 <6.1 ;
2nd Qtr 6/14/11 <1.0 <1.0 <1.0 <1.0 44 <0.1
3rd Qtr 8/16/11 <1.0 <1.0 <1.0 <1.0 41 <0.1
4th Qtr 11/15/11 <1.0 <1.0 <1.0 <1.0 43 <0.1
(1)1st Qtr 1/17/12 <1.0 <1.0 <1.0 <1.0 40 <0.1
2nd Qtr 5/31/12 <1.0 <1.0 <1.0 <1.0 44 <0.1
3rd Qtr 8/29/12 <1.0 <1.0 <1.0 <1.0 46 <0.1
4th Qtr 10/3/12 <1.0 <1.0 <1.0 <1.0 45 <0.1
1st Qtr 2/7/13 <1.0 <1.0 <1.0 <1.0 43.6 <0.1
2nd Qtr 5/30/13 <1.0 <1.0 <1.0 <1.0 44.7 0.1
3rd Qtr 9/5/13 <1.0 <1.0 <1.0 <1.0 48 <0.1
4th Qtr 11/7/13 <1.0 <1.0 <1.0 <1.0 43 <0.1
1st Qtr 1/23/14 <1.0 <1.0 <1.0 <1.0 44.6 <0.1
2nd Qtr 5/19/14 <1.0 <1.0 <1.0 <1.0 42.3 <0.1
3rd Qtr 8/13/14 <1.0 <1.0 <1.0 <1.0 46 <0.1
4th Qtr 10/28/14 <1.0 <1.0 <1.0 <1.0 46.8 <0.1
1st Qtr 3/12/15 <1.0 <1.0 <1.0 <1.0 47.3 <0.1
2nd Qtr 6/8/15 <1.0 <1.0 <1.0 <1.0 48.4 <0.1
3rd Qtr 9/3/15 <1.0 <1.0 <1.0 <1.0 54.1 <0.1
4th Qtr 10/28/15 <1.0 <1.0 <1.0 <1.0 46.4 <0.1
Duplicate TW4-70 <1.0 <1.0 <1.0 <1.0 46.4 <0.1
1st Qtr 3/16/16 <1.0 <1.0 <1.0 <1.0 49.1 <0.1
2nd Qtr 5/26/16 <1.0 <1.0 <1.0 <1.0 50.4 <0.1
3rd Qtr 8/23/16 <1.0 <1.0 <1.0 <1.0 49.6 <0.1
4th Qtr 10/12/16 <1.0 <1.0 <1.0 <1.0 52.1 <0.1
(1) As of March 2012 both north and south wild life ponds no longer receiving water.
NA = not analyzed
Shaded indicates concentrations exceeding GWQS.
TABLE 1 (25 of 29)
Historic Summary Of Monitoring Parameters Up To The 4th Quarter 2016
Chloroform Contamination Investigation
DUSA White Mesa Mill
Well
Sampling Event
Parameter
(GWQS)
Carbon Tetrachloride
(5 pg/L)
Chloroform
(70 pg/L)
Chloromethane
(30 pg/L)
Methylene Chloride
(5 pg/L)
Chloride
No GWQS (mq/L)
Nitrate, Nitrate + Nitrite
(10 mg/L)
TW4-24
(nitrate pumping well started
1/26/13)
2nd Qtr 6/27/07 <1.0 2.6 <1.0 <1.0 770 26.1
3rd Qtr 8/15/07 <1.0 2.2 <1.0 <1.0 791 29
4th Qtr 10/10/07 <1.0 1.5 <1.0 <1.0 692 24.7
1st Qtr 3/28/08 <1.0 1.5 <1.0 <1.0 740 24.4
2nd Qtr 6/25/08 <1.0 1.4 <1.0 <1.0 834 45.3
3rd Qtr 9/10/08 <1.0 2.9 <1.0 <1.0 1180 38.4
4th Qtr 10/15/08 NA NA NA NA 1130 44.8
11/18/08 <2.0 <2.0 <2.0 <2.0 NA NA
1st Qtr 3/4/09 <1.0 1.4 <1.0 <1.0 1010 30.5
2nd Qtr 6/23/09 <1.0 1.5 <1.0 <1.0 759 30.4
3rd Qtr 9/14/09 <1.0 1.4 <1.0 <1.0 618 30.7
4th Qtr 12/16/09 <1.0 1.2 <1.0 <1.0 1080 28.3
1st Qtr 2/25/10 <1.0 1.3 <1.0 <1.0 896 33.1
2nd Qtr 6/14/10 <1.0 1.7 <1.0 <1.0 639 30
3rd Qtr 8/24/10 <1.0 1.8 <1.0 <1.0 587 31
4th Qtr 10/15/10 <1.0 1.4 <1.0 <1.0 522 31
1st Qtr 2/17/11 <1.0 1.8 <1.0 <1.0 1100 31
2nd Qtr 5/26/11 <1.0 1.1 <1.0 <1.0 1110 35
3rd Qtr 8/17/11 <1.0 1.7 <1.0 <1.0 967 34
4th Qtr 11/16/11 NA NA NA NA 608 35
(,) 12/7/11 <1.0 1.2 <1.0 <1.0 NA NA
(2)1st Qtr 1/16/12 <1.0 <1.0 <1.0 <1.0 373 37
2nd Qtr 6/6/12 <1.0 <1.0 <1.0 <1.0 355 37
3rd Qtr 8/30/12 <1.0 <1.0 <1.0 <1.0 489 37
4th Qtr 10/3/12 <1.0 1 <1.0 <1.0 405 38
(3) 1st Qtr 2/11/13 <1.0 1 <1.0 <1.0 1260 35.9
2nd Qtr 6/5/13 <1.0 17.4 <1.0 <1.0 916 23.7
3rd Qtr 8/30/13 <1.0 21.8 <1.0 <1.0 998 33
4th Qtr 10/29/13 <1.0 32.5 <1.0 <1.0 1030 35
1st Qtr 1/27/14 1.18 78.5 <1.0 <1.0 809 31.6
2nd Qtr 5/19/14 <1.0 62.7 <1.0 <1.0 1020 35.0
3rd Qtr 8/11/14 <1.0 76.3 <1.0 <1.0 1150 31.5
4th Qtr 10/21/14 <1.0 25.8 <1.0 <1.0 1050 35.7
1st Qtr 3/9/15 <1.0 49.2 <1.0 <1.0 944 34.6
2nd Qtr 6/8/15 <1.0 4.28 <1.0 <1.0 1290 31.8
3rd Qtr 8/31/15 <1.0 46.9 <1.0 <1.0 788 25.3
4th Qtr 10/19/15 <1.0 25.3 <1.0 <1.0 909 29.6
1st Qtr 3/9/16 <1.0 22 8 <1.0 <1.0 989 29.1
2nd Qtr 5/23/16 <1.0 69.6 <1.0 <1.0 771 24.2
3rd Qtr 7/25/16 <1.0 17.8 <1.0 <1.0 1180 34.4
4th Qtr 10/12/16 <1.0 20.8 <1.0 <1.0 1010 31.9
(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.
ChJoroform_pum£ing well started 1/26/13.
NA = not analyzed
Shaded indicates concentrations exceeding GWQS.
TABLE 1 (26 of 29)
Historic Summary Of Monitoring Parameters Up To The 4th Quarter 2016
Chloroform Contamination Investigation
DUSA White Mesa Mill
Well Parameter
Sampling Event (GWQS)
Carbon Tetrachloride Chloroform Chloromethane Methylene Chloride Chloride Nitrate, Nitrate + Nitrite
(5 pg/L)(70 pg/L)(30 pg/L)(5 pg/L)No GWQS (mq/L)(10 mq/L)
TW4-25
(nitrate pumping wel started
1/26/13)
2nd Qtr 6/27/07 <1.0 <1.0 <1.0 <1.0 395 17.1
3rd Qtr 8/15/07 <1.0 2.2 <1.0 <1.0 382 29
4th Qtr 10/10/07 <1.0 <1.0 <1.0 <1.0 358 17
1st Qtr 3/28/08 <1.0 <1.0 <1.0 <1.0 374 18.7
2nd Qtr 6/25/08 <1.0 <1.0 <1.0 <1.0 344 22.1
3rd Qtr 9/10/08 <1.0 <1.0 <1.0 <1.0 333 18.8
4th Qtr 10/15/08 NA NA NA NA 366 21.3
4th Qtr 11/18/09 <2.0 <2.0 <2.0 <2.0 NA NA
1st Qtr 3/4/09 <1.0 <1.0 <1.0 <1.0 332 15.3
2nd Qtr 6/23/09 <1.0 <1.0 <1.0 <1.0 328 15.3
3rd Qtr 9/14/09 <1.0 <1.0 <1.0 <1.0 328 3.3
4th Qtr 12/14/09 <1.0 <1.0 <1.0 <1.0 371 14.2
1st Qtr 2/23/10 <1.0 <1.0 <1.0 <1.0 296 14.4
2nd Qtr 6/14/10 <1.0 <1.0 <1.0 <1.0 306 16
3rd Qtr 8/10/10 <1.0 <1.0 <1.0 <1.0 250 14
4th Qtr 10/15/10 <1.0 <1.0 <1.0 <1.0 312 15
1st Qtr 2/16/11 <1.0 1.8 <1.0 <1.0 315 15
2nd Qtr 5/25/11 <1.0 <1.0 <1.0 <1.0 321 16
3rd Qtr 8/16/11 <1.0 <1.0 <1.0 <1.0 276 16
4th Qtr 11/15/11 <1.0 <1.0 <1.0 <1.0 294 16
(2)1st Qtr 1/16/12 <1.0 <1.0 <1.0 <1.0 304 16
2nd Qtr 5/31/12 <1.0 <1.0 <1.0 <1.0 287 16
3rd Qtr 9/4/12 <1.0 <1.0 <10 <1.0 334 17
4th Qtr 10/3/12 <1.0 <1.0 <1.0 <1.0 338 17
(3)1 st Qtr 2/11/13 <1.0 <1.0 <1.0 <1.0 190 9.04
2nd Qtr 6/5/13 <1.0 <1.0 <1.0 <1.0 136 5.24
3rd Qtr 9/4/13 <1.0 <1.0 <1.0 <1.0 119 5.69
4th Qtr 10/31/13 <1.0 <1.0 <1.0 <1.0 886 6.1
1st Qtr 1/27/14 <1.0 <1.6 <1.0 <1.0 85.7 2.16
2nd Qtr 5/19/14 <1.0 <1.0 <1.0 <1.0 51.1 1.21
3rd Qtr 8/11/14 <1.0 <1.0 <1.0 <1.0 67 1.6
4th Qtr 10/21/14 <1.0 <1.0 <1.0 <1.0 58.1 1.03
1st Qtr 3/9/15 <1.0 <1.0 <1.0 <1.0 310 14.4
2nd Qtr 6/8/15 <1.0 <1.0 <1.0 <1.0 58.3 1.14
3rd Qtr 8/31/15 <1.0 <1.0 <1.0 <1.0 69.2 1.63
4th Qtr 10/19/15 <1.0 <1.0 <1.0 <1.0 93.7 1.78
1st Qtr 3/9/16 <1.0 <1.0 <1.0 <1.0 62.7 0.837
2nd Qtr 5/23/16 <1.0 <1.0 <1.0 <1.0 75.5 0.959
3rd Qtr 7/25/16 <1.0 <1.0 <1.0 <1.0 74.1 1.780
4th Qtr 10/12/16 <1.0 <1.0 <1.0 <1.0 59.8 1.240
(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£ing well started 1/26/13.
NA = not analyzed
Shaded indicates concentrations exceeding GWQS.
TABLE 1 (27 of 29)
Historic Summary Of Monitoring Parameters Up To The 4th Quarter 2016
Chloroform Contamination Investigation
DUSA White Mesa Mill
Well
Sampling Event
Parameter
(GWQS)
Carbon Tetrachloride
(5 pg/L)
Chloroform
(70 pg/L)
Chloromethane
(30 pg/L)
Methylene Chloride
(5 pg/L)
Chloride
No GWQS (mq/L)
Nitrate, Nitrate + Nitrite
(10 mg/L)
TW4-26
2nd Qtr 6/14/10 <1.0 13 <1.0 <1.0 33 7.9
3rd Qtr 8/24/10 <1.0 5.2 <1.0 <1.0 17 9.0
4th Qtr 10/15/10 <1.0 5.4 <1.0 <1.0 22 9.6
1st Qtr 2/16/11 <1.0 2 <1.0 <1.0 30 10.0
2nd Qtr 5/26/11 <1.0 2.9 <1.0 <1.0 15 10.0
3rd Qtr 8/17/11 <1.0 2.8 <1.0 <1.0 19 11.0
4th Qtr 11/16/11 NA NA NA NA 26 10.0
<1) 12/7/11 <1.0 5.2 <1.0 <1.0 NA NA
(2)1st Qtr 1/18/12 <1.0 7 <1.0 <1.0 17 11.0
2nd Qtr 6/6/12 <1.0 4.1 <1.0 <1.0 19 12.0
3rd Qtr 9/11/12 <1.0 4.9 <1.0 <1.0 19 9.0
4th Qtr 10/3/12 <1.0 4.9 <1.0 <1.0 19 12.0
1st Qtr 2/7/13 <1.0 4.9 <1.0 <1.0 16.6 12.5
2nd Qtr 6/13/13 <1.0 2.12 <1.0 <1.6 14.5 13.6
3rd Qtr 9/5/13 <1.0 2.81 <1.0 <1.6 17.6 11.7
4th Qtr 11/7/13 <1.0 3.37 <1.0 <1.0 15.9 15.9
1st Qtr 1/29/14 <1.0 1.43 <1.0 <1.0 16.9 14.2
2nd Qtr 5/21/14 <1.0 4.23 <1.0 <1.0 15.4 12.5
3rd Qtr 8/11/14 <1.0 1.3 <1.0 <1.0 15 10.8
4th Qtr 10/28/14 <1.0 2.45 <1.0 <1.0 14.6 12.3
1st Qtr 3/12/15 <1.0 2.37 <1.0 <1.0 14.4 14.4
2nd Qtr 6/10/15 <1.0 6.12 1.17 <1.0 14.4 11.3
3rd Qtr 9/3/15 <1.0 4.77 <1.0 <1.0 14 14.2
4th Qtr 10/28/15 <1.0 3.45 <1.0 <1.0 13.3 13.9
1st Qtr 3/16/16 <1.6 1.8 <1.0 <1.0 13.7 16.9
2nd Qtr 5/26/16 <1.0 8.23 <1.0 <1.0 15.2 13.9
3rd Qtr 8/3/16 <1.0 4.42 <1.0 <1.0 13.9 17.9
4th Qtr 10/20/16 <1.0 19.9 <1.0 <1.0 14.2 15.0
TW4-27
(2)1st Qtr 1/18/12 <1.0 9 <1.0 <1.0 11 24.0
2nd Qtr 6/13/12 <1.0 <1.0 <1.0 <1.0 17 41.0
3rd Qtr 9/4/12 <1.0 <1.0 <1.6 <1.0 21 37.0
4th Qtr 10/3/12 <1.0 <1.0 <1.0 <1.0 18 36.0
1st Qtr 2/7/13 <1.0 <1.0 <1.0 <1.0 18.8 31.2
2nd Qtr 6/13/13 <1.0 <1.0 <1.0 <1.0 20.3 29.4
3rd Qtr 8/30/13 <1.6 <1.0 <1.0 <1.0 19 27.2
4th Qtr 11/6/13 <1.0 <1.0 <1.0 <1.0 21.8 29.8
1st Qtr 1/23/14 <1.0 <1.0 <1.0 <1.0 31.8 31.3
2nd Qtr 5/21/14 <1.6 <1.0 <1.0 <1.6 20.6 31.1
3rd Qtr 8/13/14 <1.0 <1.0 <1.0 <1.6 23 27.0
4th Qtr 10/28/14 <1.0 <1.0 <1.0 <1.0 24.4 28.2
1st Qtr 3/11/15 <1.0 <1.0 <1.0 <1.0 26.2 26.5
2nd Qtr 6/10/15 <1.0 <1.0 <1.0 <1.0 26.8 24.0
3rd Qtr 9/2/15 <1.0 1.3 <1.0 <1.0 26.8 20.9
4th Qtr 10/28/15 <1.0 1.6 <1.0 <1.0 26.2 23.5
1st Qtr 3/16/16 <1.0 2.li <1.0 <1.0 28 25.0
2nd Qtr 5/26/16 <1.0 3.16 <10 <1.0 21.2 28.7
3rd Qtr 8/3/16 <1.0 2.78 <1.0 <1.0 27.1 21.8
4th Qtr 10/20/16 <1.0 3.8 <1.0 <1.0 29.4 19.3
TW4-28
2nd Qtr 6/19/13 <1.0 <1.0 <1.0 <1.0 44.6 14.9
3rd Qtr 8/29/13 <1.6 <1.0 <1.0 <1.0 45.3 17.3
4th Qtr 11/6/13 <1.0 <1.0 <1.0 <1.0 45.3 16.2
1st Qtr 1/22/14 <1.0 <1.0 <1.0 <1.0 47.8 16.9
2nd Qtr 5/21/14 <1.0 <1.6 <1.0 <1.0 45.7 16.5
3rd Qtr 8/13/14 <1.0 <1.0 <1.0 <1.0 50 14.2
4th Qtr 10/23/14 <1.0 <1.0 <1.0 <1.0 52.1 16.5
1st Qtr 3/11/15 <1.0 <1.0 <1.0 <1.0 52.2 ; 19 0
2nd Qtr 6/10/15 <1.0 <1.0 <1.0 <1.0 56.4 19.0
3rd Qtr 9/2/15 <1.0 <1.0 <1.0 <1.0 61.4 17.8
4th Qtr 10/21/15 <1.0 <1.0 <1.0 <1.0 52.7 18.7
1st Qtr 3/15/16 <1.0 <1.0 <1.0 <1.0 61.6 34.0
Duplicate TW4-65 <1.0 <1.0 <1.0 <1.0 61.4 32.6
2nd Qtr 5/25/16 <1.0 <1.0 <1.0 <1.0 67.1 29.0
3rd Qtr 7/27/16 <1.0 <1.0 <1.0 <1.0 70.1 31.3
Duplicate TW4-65 <1.0 <1.0 <1.0 <1.0 70.9 35.6
4th Qtr 10/19/16 <1.0 <1.0 <1.0 <1.0 70.9 25.5
Duplicate TW4-65 <1.0 <1.0 <1.0 <1.0 73.7 254
(1) VOCs were resampled because laboratory missed holding time.
NA = not analyzed
Shaded indicates concentrations exceeding GWQS.
TABLE 1 (28 of 29)
Historic Summary Of Monitoring Parameters Up To The 4th Quarter 2016
Chloroform Contamination Investigation
DUSA White Mesa Mill
Well
Sampling Event
Parameter
(GWQS)
Carbon Tetrachloride
(5 pg/L)
Chloroform
(70 pg/L)
Chloromethane
(30 pg/L)
Methylene Chloride
(5 pg/L)
Chloride
No GWQS (mg/L)
Nitrate, Nitrate + Nitrite
(10 mg/L)
TW4-29
2nd Qtr 6/19/13 <1.0 242 <1.0 <1.0 44.8 4.60
2nd Qtr 7/11/13 <1.0 262 <1.0 <1.0 37.7 3.52
3rd Qtr 9/26/13 <1.0 246 <1.0 <1.0 41.4 4.18
4th Qtr 11/13/13 <1.0 260 <1.0 <1.0 42.5 4.11
1st Qtr 2/5/14 <1.0 258 <1.0 <1.0 14.9 4.63
2nd Qtr 5/22/14 <1.0 262 <1.0 <1.0 38.2 3.52
3rd Qtr 8/27/14 <1.0 242 <1.0 <1.0 41 3.40
4th Qtr 10/29/14 <1.0 290 <1.0 <1.0 41 3.64
1st Qtr 3/12/15 <1.0 299 <1.0 <1.0 40.5 4.14
2nd Qtr 6/11/15 <1.0 329 <1.0 <1.0 42.5 2.95
3rd Qtr 9/3/15 <1.0 276 <1.0 <1.0 47.3 2.19
4th Qtr 10/29/15 <1.0 631 <1.0 <1.0 39.8 2.74
1st Qtr 3/17/16 <1.0 335 <1.0 <1.0 40.5 2.92
2nd Qtr 6/8/16 <1.0 366 <1.0 <1.0 42.9 2.51
3rd Qtr 8/3/16 <1.0 401 <1.0 <1.0 40.6 2.44
4th Qtr 10/26/16 <1.0 392 <1.0 <1.0 44.2 2.40
TW4-30
2nd Qtr 6/19/13 <1.0 <1.0 <10 <1.0 36 0.95
3rd Qtr 9/26/13 <1.0 <1.0 <1.0 <1.0 36.3 0.952
4th Qtr 11/13/13 <1.0 <1.0 <1.0 <1.0 35.9 1.24
1st Qtr 1/23/14 <1.0 <1.0 <1.0 <1.0 36.9 1.36
2nd Qtr 5/22/14 <1.0 <1.0 <1.0 <1.0 31.9 1.44
3rd Qtr 8/13/14 <1.0 <1.0 <1.0 <1.0 38 1.5
4th Qtr 10/23/14 <1.0 <1.0 <1.0 <1.0 37.1 1.84
1st Qtr 3/11/15 <1.0 1.65 <1.0 <1.0 38.3 2.15
2nd Qtr 6/11/15 <1.0 2.25 <10 <1.0 40.3 1.75
3rd Qtr 9/3/15 <1.0 3.27 <1.0 <1.0 44.2 1.75
4th Qtr 10/28/15 <1.0 3.48 <1.0 <1.0 37.8 1 86
1st Qtr 3/17/16 <1.0 5.16 <1.0 <1.0 39.6 2.74
2nd Qtr 5/26/16 <1.0 7.38 <10 <1.0 40.2 2.04
3rd Qtr 8/3/16 <1.0 6.79 <1.0 <1.0 38.6 2.32
4th Qtr 10/20/16 <1.0 8.69 <1.0 <1.0 41.3 2.51
TW4-31
2nd Qtr 6/19/13 <1.0 <1.0 <1.0 <1.0 28.4 1.3
3rd Qtr 9/5/13 <1.0 <1.0 <1.0 <1.0 29.4 1.1
4th Qtr 11/7/13 <1.0 <1.0 <1.0 <1.0 28 1.33
1st Qtr 1/23/14 <1.0 <1.0 <1.0 <1.6 28.5 1.32
2nd Qtr 5/21/14 <1.0 <1.0 <1.0 <1.0 26.3 1.22
3rd Qtr 8/13/14 <1.0 <1.0 <1.0 <1.0 30 1.1
4th Qtr 10/28/14 <1.0 <1.0 <1.0 <1.0 37.1 1.84
1st Qtr 3/11/15 <1.0 <1.0 <1.0 <1.0 30 6 1.33
2nd Qtr 6/10/15 <1.0 <1.0 <1.0 <1.0 31.1 1.19
3rd Qtr 9/2/15 <1.0 <1.0 <1.0 <1.0 304 0.916
4th Qtr 10/21/15 <1.0 <1.0 <10 <1.0 29.1 0.953
1st Qtr 3/16/16 <1.0 <1.0 <1.0 <1.0 31.5 1.84
2nd Qtr 5/25/16 <1.0 <1.0 <1.0 <1.0 32 5 1.36
3rd Qtr 7/28/16 <1.0 <1.0 <1.0 <1.0 30.6 1.41
4th Qtr 10/20/16 <1.0 <1.0 <1.0 <1.0 34 1.14
TW4-32
4th Qtr 11/14/13 <1.0 <1.0 <1.0 <1.0 52.1 4.26
1st Qtr 1/22/14 <1.0 <1.0 <1.0 <1.0 54.5 5.11
2nd Qtr 5/21/14 <1.0 <1.0 <1.0 <1.0 54 9 5.63
3rd Qtr 8/13/14 <1.0 <1.0 <1.0 <1.0 64 4.2
4th Qtr 10/23/14 <1.0 <1.0 <1.0 <1.0 62.6 2.14
1st Qtr 3/11/15 <1.0 <1.0 <1.0 <1.0 64.2 2.46
! Duplicate TW4-65 <1.0 <1.0 <1.0 <1.0 65.9 2.25
2nd Qtr 6/10/15 <1.0 <1.0 <10 <1.0 62.7 1.21
3rd Qtr 9/2/15 <1.0 <1.0 <1.0 <1.0 596 5.09
4th Qtr 10/21/15 <1.0 <1.0 <1.0 <1.0 55.1 1.19
1st Qtr 3/15/16 <1.0 <1.0 <1.0 <1.0 64.2 4.48
2nd Qtr 5/25/16 <1.0 <1.0 <1.0 <1.0 71.8 3.16
3rd Qtr 7/28/16 <1.0 <1.0 <1.0 <1.0 64.4 3.44
4th Qtr 10/19/16 <1.0 <1.0 <1.0 <1.0 66 2 87
Shaded indicates concentrations exceeding GWQS.
TABLE 1 (29 of 29)
Historic Summary Of Monitoring Parameters Up To The 4th Quarter 2016
Chloroform Contamination Investigation
DUSA White Mesa Mill
Well Parameter
Sampling Event (GWQS)
Carbon Tetrachloride Chloroform Chloromethane Methylene Chloride Chloride Nitrate, Nitrate + Nitrite
(5 pg/L)(70 pg/L)(30 pg/L)(5 pg/L)No GWQS (mg/L)(10 mg/L)
TW4-33
4th Qtr 11/14/13 <1.0 126 <1.0 <1.0 47.2 1.82
1st Qtr 1/30/14 <1.0 124 <1.0 <1.0 43.5 2.56
2nd Qtr 5/22/14 <1.0 121 <1.0 <1.0 46.8 1.63
3rd Qtr 8/27/14 <1.0 104 <1.0 <1.0 43 1.50
4th Qtr 10/29/14 <1.0 124 <1.0 <1.0 44.2 2 22
1st Qtr 3/12/15 <1.0 134 <1.0 <1.0 44.2 1.91
2nd Qtr 6/11/15 <1.0 127 <1.0 <1.0 46.6 1.62
3rd Qtr 9/3/15 <1.0 123 <1.0 <1.0 53.3 1.64
4th Qtr 10/29/15 <1.0 129 <1.0 <1.0 44.5 1.92
1st Qtr 3/17/16 <1.0 122 <1.0 <1.0 46.2 2.13
2nd Qtr 6/8/16 <1.0 96.1 <1.0 <1.6 49.7 2 06
3rd Qtr 8/4/16 <1.0 121 <1.0 <1.0 48.5 2.32
4th Qtr 10/26/16 <1.0 109 <1.0 <1.0 52.4 2.36
TW4-34
4th Qtr 11/14/13 <1.0 <1.0 <1.0 <1.0 19.2 1.64
1st Qtr 1/23/14 <1.0 <1.0 <1.0 <1.0 20.4 1.93
2nd Qtr 5/22/14 <1.0 <1.0 <1.0 <1.0 17.9 1.69
3rd Qtr 8/13/14 <1.0 <1.0 <1.0 <1.0 18 1.10
4th Qtr 10/29/14 <1.0 <1.0 <1.0 <1.0 17,8 1.16
1st Qtr 3/11/15 <1.0 <1.0 <1.0 <1.0 17.7 1.21
2nd Qtr 6/11/15 <1.0 <1.0 <1.0 <1.0 17.4 0.868
3rd Qtr 9/3/15 <1.0 <1.0 <1.0 <1.0 15.1 0.458
4th Qtr 10/21/15 <1.0 <1.0 <1.0 <1.0 15.8 0.368
1st Qtr 3/16/16 <1.0 <1.0 <1.0 <1.0 17.3 0.925
2nd Qtr 5/25/16 <1.0 <1.0 <1.0 <1.6 18 0.605
3rd Qtr 8/3/16 <1.0 <1.0 <1.0 <1.0 17.2 0.726
4th Qtr 10/20/16 <1.0 <1.0 <1.0 <1.0 19 0.612
TW4-35
3rd Qtr 8/27/14 <1.0 <1.0 <1.0 <1.0 ....34 0.2
4th Qtr 10/28/14 <1.0 <1.0 <10 <1.0 34.1 0.351
ist Qtr 3/11/15 <1.0 <1.0 <1.0 <1.0 34.9 0.436
2nd Qtr 6/10/15 <1.0 <1.0 <1.0 <1.0 35.2 0.452
3rd Qtr 9/3/15 <1.0 <1.0 <1.0 <1.0 35.9 0.304
4th Qtr 10/28/15 <1.0 <1.0 <1.0 <1.0 33.4 0.419
1st Qtr 3/16/16 <1.0 <1.0 <1.0 <1.0 35.4 0.521
2nd Qtr 5/26/16 <1.0 <1.0 <1.0 <1.0 35.4 0.631
3rd Qtr 8/3/16 <1.0 <1.0 <1.0 <1.0 34.8 0.723
4th Qtr 10/20/16 <1.0 <1.0 <1.0 <1.0 37.1 0.626
TW4-36
3rd Qtr 8/27/14 <1.0 <1.0 <1.0 <1.0 65 .........................................<0.1
4th Qtr 10/23/14 <1.0 <1.0 <1.0 <1.0 67.3 <0.1
1st Qtr 3/11/15 <1.0 <1.0 <1.0 <1.0 67.2 <0.1
2nd Qtr 6/10/15 <1.0 <1.0 <1.0 <1.0 69.3 <0.1
3rd Qtr 9/3/15 <1.0 <1.0 <1.0 <1.0 76.4 <0.1
4th Qtr 10/21/15 <1.0 <1.0 <1.0 <1.0 64.5 <0.1
1st Qtr 3/11/15 <1.0 <1.0 <1.0 <1.0 67.2 <0.1
2nd Qtr 5/25/16 <1.0 <1.0 <1.0 <1.0 72.3 <0.1
3rd Qtr 7/28/16 <1.0 <1.0 <1.0 <1.0 69.4 <0.1
4th Qtr 10/20/16 <1.0 <1.0 <1.0 <1.0 73.8 <0.1
Duplicate TW4-70 <1.0 <1.0 <1.0 <1.0 72 <0.1
TW4-37(cliloroform pumping
well 6/9/15)
2nd Qtr 6/8/15 18.2 30,200 15.7 1.94 345 35.2
3rd Qtr 8/31/15 16.6 19,100 13.7 1.04 374 32.4
4th Qtr 10/19/15 12.5 19,500 9.38 1.17 399 34.6
1st Qtr 3/9/16 15.8 17,500 3.57 1.34 332 28.4
2nd Qtr 5/23/16 14.4 16,200 3.57 1.17 389 27.9
3rd Qtr 7/25/16 16.7 15,900 <1.0 <1.0 294 33.4
4th Qtr 10/12/16 16.3 16,400 <1.0 <1.0 304 26.1
TW4-38
4th Qtr 11/10/16 <1.0 <1.0 <1.0 <1.0 40 11.2
VMl (11/2016)
4th Qtr 11/11/16 <1.0 2,800 <1.0 <1,0 68.9 20.7
Shaded indicates concentrations exceeding GWQS.
(1) VOCs were resampled because laboratory missed holding time.
Table 2
Summary of QA/QC Samples
3rd Quarter 2016
Parameter GWQS Duplicate of TW4-28 Duplicate of TW4-23
TW4-28 TW4-65 RPD TW4-23 TW4-70 RPD
Chloride none 70.1 70.9 -1.1 49.6 48.3 2.7
Nitrate + Nitrite (as N] 10 mg/L 31.3 35.6 -12.9 <0.1 <0.1 nc
Chloroform 70 |jg/L <1.0 <1.0 nc <1.0 <1.0 nc
Carbon tetrachloride 5pg/L <1.0 <1.0 nc <1.0 <1.0 nc
Chloromethane 30 jjg/L <1.0 <1.0 nc <1.0 <1.0 nc
Methylene Chloride 5 pg/L <1.0 <1.0 nc <1.0 <1.0 nc
nc = not calculated
4th Quarter 2016
Parameter GWQS Duplicate of TW4-28 Duplicate of TW4-36 Duplicate of TW4-5
TW4-28 TW4-65 RPD TW4-36 TW4-70 RPD TW4-5 TW4-75 RPD
Chloride none 70.9 73.7 -3.9 37.2 72 -63.7 47.8 49.5 -3.5
Nitrate + Nitrite (as N) 10 mg/L 25.5 25.4 0.4 <0.1 <0.1 nc 8.32 8.34 -0.2
Chloroform 70 pg/L <1.0 <1.0 nc <1.0 <1.0 nc 9.9 12 -19.2
Carbon tetrachloride 5 pg/L <1.0 <1.0 nc <1.0 <1.0 nc <1.0 <1.0 nc
Chloromethane 30 pg/L <1.0 <1.0 nc <1.0 <1.0 nc <1.0 <1.0 nc
Methylene Chloride 5 pg/L <1.0 <1.0 nc <1.0 <1.0 nc <1.0 <1.0 nc
nc = not calculated
Tabel 3
Chloroform Mass Removal Calculations for the 3rd Qurater 2016
DUSA White Mesa Mill, Bland, Utah
Well ID MW4 MW-26 TWN-2 TW4-1 TW4-2 TW4-4 TW4-11 TW4-19 TW4-20 TW4-21 TW4-22 TW4-24 TW4-25 TW4-37
<1)Chloroform (ug/L)1,430 3,190 0 1,160 1,780 1,380 3,200 6,040 23,600 456 5,840 17.4 0 15,900
Chloroform (g/L)1.43E-03 3.19E-03 0.00E+00 1.16E-03 1.78E-03 1.38E-03 3.20E-03 6.04E-03 2.36E-02 4.56E-04 5.84E-03 1.74E-05 O.00E+00 1.59E-02
Chloroform (Ibs/L)3.16E-06 7.05E-06 0.00E+00 2.56E-06 3.93E-06 3.05E-06 7.07E-06 1.33E-05 5.21 E-05 1.01E-06 1.29E-05 3.84E-08 0.00E+00 3.51 E-05
Chloroform (Ibs/gal) 1.20E-05 2.67E-05 0.00E+00 9.70E-06 1.49E-05 1.15E-05 2.68E-05 5.05E-05 1.97E-04 3.81 E-06 4.88E-05 1.46E-07 0.00E+00 1.33E-04
Total gallons pumped 1st qtr2016 79,786 17,150 42,330 15,614 17,487 50,104 2,954 103,609 12,187 110,382 22,144 51,766 104,984 98,378
lbs of chloroform removed 0.95 0.46 0.00 0.15 0.26 0.58 0.08 5.23 2.41 0.42 1.08 0.01 0.00 13.08
Gallons of chloroform removed 0.08 0.04 0.00 0.01 0.02 0.05 0.01 0.43 0.20 0.03 0.09 0.001 0.00 1.06
total lbs of chloroform removed 24.71
total gallons of chloroform removed 2.01
1) Assuming that the chloroform concentration result for the 1 st quarter monitoring event is the average chloroform concentration for the entire quarter.
Chloroform Pumping Wells
Nitrate Pumping Wells
4th Qurater 2016
Well ID MW4 MW-26 TWN-2 TW4-1 TW4-2 TW4-4 TW4-11 TW4-19 TW4-20 TW4-21 TW4-22 TW4-24 TW4-25 TW4-37 TW4-39
(1)Chloroform (ug/L)1,470 2,510 0 1,330 1,600 1,430 3,180 6,640 21,300 434 3,370 20.8 0 16,400 2,800
Chloroform (g/L)1.47E-03 2.51 E-03 0.00E+00 1.33E-03 1.60E-03 1.43E-03 3.18E-03 6.64E-03 2.13E-02 4.34E-04 3.37E-03 2.08E-05 O.OOE+OO 1.64E-02 2.80E-03
Chloroform (Ibs/L)3.25E-06 5.55E-06 O.OOE+OO 2.94E-06 3.54E-06 3.16E-06 7.03E-06 1 47E-05 4.71 E-05 9.59E-07 7.45E-06 4.60E-08 0.00E+00 3.62E-05 6.19E-06
Chloroform (Ibs/gal)1.23E-05 2.10E-05 0.00E+00 1,11 E-05 1.34E-05 1.20E-05 2.66E-05 5.55E-05 1.78E-04 3.63E-06 2.82E-05 1.74E-07 O.OOE+OO 1.37E-04 2.34E-05
Total gallons pumped 2nd qtr 2016 85,414 18,542 44,641 16,757 19,741 31,656 3,050 104,919 12,880 130,311 23,647 99,523 98,681 101,949 3,589
lbs of chloroform removed 1.05 0.39 0.00 0.19 0.26 0.38 0.08 5.83 2.29 0.47 0.67 0.02 0.00 13.98 0.08
Gallons of chloroform removed 0.09 0.03 0.00 0.02 0.02 0.03 0.01 0.47 0.19 0.04 0.05 0.001 0.00 1.14 0.01
total lbs of chloroform removed 25.69
total gallons of chloroform removed 2.09
1) Assuming that the chloroform concentration result for the 2nd quarter monitoring event is the average chloroform concentration for the entire quarter.
Chloroform Pumping Wells
Nitrate Pumping Wells