DRC-2016-010468 - 0901a06880672e53

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
VRC.-20\b-O\Okrb6
MEMORANDUM
Phi, Goble V*
Dean Henderson
October 5, 2016
Review of the 1st and 2nd Quarter, 2016 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 May 19,
2016 1st Quarter 2016 Chloroform Monitoring Report (“1st Quarter, 2016”) and the August 18, 2016 2nd
Quarter 2016 Chloroform Monitoring Report (“2nd 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.
TO:
FROM:
DATE:
SUBJECT:
REVIEW
Monitor Well Sampling
The following monitor wells were sampled as required in the QAP for both 1st Quarter, 2016 and 2nd
Quarter, 2016 (see Table 1 below):
MW-4 TW4-8 TW4-20 TW4-30
MW-26 TW4-9 TW4-21 TW4-31
MW-32 TW4-10 TW4-22 TW4-32
195 North 1950 West • Salt Lake City, UT
Mailing Address: P O Box 144880 • Salt Lake City, UT 84114-4880
Telephone [phone] • Fax [phone] • T.D D. [phone]
immu.deq.uttih.gov
Printed on 100% recycled paper
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TW4-1 TW4-11
TW4-2 TW4-12
TW4-3 TW4-13
TW4-4 TW4-14
TW4-5 TW4-16
TW4-6 TW4-18
TW4-7 TW4-19
TW4-23 TW4-33
TW4-24 TW4-34
TW4-25 TW4-35
TW4-26 TW4-36
TW4-27 TW4-37
TW4-28
TW4-29
For both the 1st Quarter, 2016 and 2nd 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):
Wells: MW--32, TW4-5, TW4-7, TW4-8, TW4-9, TW4-12, TW4-16, TW4-18, TW4-23, TW4-
28, and TW4-32 in 1st Quarter, 2016 and 2nd Quarter, 2016 and TW4-3 in 2nd Quarter, 2016.
2. Purging a well to dryness and stability of field parameters for pH, specific conductivity, and
water temperature only after recovery:
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 in 1st Quarter, 2016 and 2nd, Quarter 2016, and TW4-3 in
1st Quarter, 2016.
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, and TW4-37.
For both 1st Quarter, 2016 and 2nd 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 1st Quarter, 2016 and 2nd 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.
Receipt Temperature
For both 1st Quarter, 2016 and 2nd Quarter, 2016 all water samples were received within the required
QAP temperature limit of 6° C.
Detection Limits
For both 1st Quarter, 2016 and 2nd 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
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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 1st Quarter, 2016. Monitor well TW4-28 and its duplicate
sample TW4-65 and MW-32 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).
Two duplicate samples were collected for the 2nd Quarter, 2016. Monitor well TW4-12 and its duplicate
sample TW4-65 and MW-32 and its duplicate sample TW4-70. All analytical results for the two
sample/duplicate pairs were within the 20% acceptance limits with the exception of nitrate. The
reported nitrate concentration for TW4-12 and TW4-65 was 30.7 mg/1 and 113 mg/1 respectively
resulting in a calculated RPD of 114 %. EFR noted this exceedance and responded: “The corrective
actions that were taken in accordance with the QAP procedure are as follows: the OA Manager
contacted the Analytical Laboratory and requested a review of the raw data to assure that there were no
transcription errors and the data were accurately reported. The laboratory noted that the data were
accurate and reported correctly. Reanalysis was not completed as the samples were beyond the holding
time. ” Based on EFR response in this circumstance it is recommended that there be no enforcement
action but use the higher nitrate concentration result for TW4-12 (113 mg/1) for compliance purposes,
(see Table 2 below).
Groundwater Flead Monitoring
For both 1st Quarter, 2016 and 2nd 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
and TWN-2.
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 1st Quarter, 2016 is 30.6 lbs. and for the 2nd Quarter, 2016 is 39.4 lbs. Table 3 below verifies
this estimate.
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 1946 lbs. in the 1st Quarter, 2016 and 2261
lbs. in the 2nd Quarter, 2016. As per Part III.B.2 of the GCAP, the electronic files were used in both the
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1st Quarter, 2016 and 2nd Quarter, 2016 calculating the mass estimate were provided in both the with the
report. 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, may 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 1st Quarter, 2016 and 2nd 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.
-Calculate chloroform mass removed by pumping wells. Calculations
would include: 1) total historic chloroform mass removed, 2) total historic
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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 DUS A 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 1st Quarter and 2nd 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 70ug/L1
Seven PM wells still exceed 70pg/L for both the 1st Quarter and 2nd Quarter, 2016: TW4-6, TW4-7,
TW4-8, TW4-10, TW4-16, TW4-29, and TW4-33 with the exception of TW4-16 in the 1st Quarter,
2016. For the first time since the 2nd quarter 2015 PM well TW4-16 was below 70pg/L with a
concentration of 45.9pg/L. In the following 2nd Quarter, 2016 chloroform concentration in this well
exceeded 70pg/L (see Table 1 below).
Compliance Monitor Wells (“CM”) [Wells with Chloroform Concentrations below 70pg/L)
For both the 1st Quarter and 2nd Quarte,r 2016 six CM wells range with detectable chloroform
concentration but still below 70pg/L: TW4-5, TW4-14, TW4-18, TW4-26, TW4-27, and TW4-30.
CM well TW4-9 exceeding chloroform action concentration of 70pg/L for two consecutive Quarterly
Sampling Events
For both the 1st Quarter and 2nd Quarter, 2016 CM well TW4-9 exceeded chloroform action
concentration of 70pg/L.
Part II.H.l) of the GCAP states that “At any time EFR submits a quarterly report that demonstrates an
exceedance (second quarter of chloroform exceedance), EFR will provide a written exceedance notice
to the Director (“Exceedance Notice ”) for all wells that have demonstrated such an exceedance. ” EFR
provided notice to the Division Director that the concentrations of chloroform in TW4-9 exceeded the
respective GCAL of 70pg/L for two consecutive quarters by letter dated August 18, 2016 (DRC-2016-
009409).
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Part II.H.2) of the GCAP requires that “Within 60 days after the time of submittal of a quarterly report
that demonstrates an exceedance as defined in Part II. G, EFR will provide a plan and schedule for
remedial actions to address and resolve the excursion, for Director approval. This plan and schedule
[“Plan”] (required under Part II.H.2) of the GCAP for TW4-9 was submitted for the Division Director
approval September 9,2016 (DRC-2016-010003). This Plan that included the drilling and installation
of two new wells TW4-38 and TW4-39 was approved by the Division Director in a letter dated
September 19, 2016 (DRC-2016-010163). On September 23, 2016 EFR notified by letter the Division
Director of their plains to begin the drilling and installation actives starting on October 17, 2016 (DRC-
2016-010313).
Well TW4-9 was a CM chloroform boundary monitoring well located up and cross gradient northeast of
the Plume. Downgradient of TW4-9 is already monitor wells within the Plume. Therefore, the Plan is
to install a monitor well (TW4-38) approximately 200 feet east up gradient of TW4-9 with the intent to
show the Plume is bound in that vicinity. An additional pumping well (TW4-39) located in the plume
approximately 200 feet west and down gradient of TW4-9 will be drilled and installed with the intent to
extract additional chloroform from the plume. After the Division Director review of the new wells as-
built report and groundwater sampling results the Division Director well determine if the new wells are
adequate or additional wells are needed to bound the Plume in this vicinity.
PM Wells Below the Laboratory Chloroform Detection Limit (<1.0 pg/L)
For both the 1st Quarter and 2nd 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 and TW4-36.
Pumping Wells
For both the 1st Quarter and 2nd Quarter, 2016 pumping wells MW-4, MW-26, TW4-1, TW4-2, TW4-4,
TW4-11, TW4-19, TW4-20, TW4-21 TW4-22 and TW4-37 exceed chloroform concentrations of
70pg/L. For both the 1st Quarter and 2nd 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).
Nitrate. Nitrate + Nitrite (“nitrate”) Concentrations
Pumping wells TW4-21, TW4-22, and TW4-24 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. 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 are likely to be captured at downgradient pumping wells (TW4-11
or TW4-2).
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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 3.16 mg/L in the 2nd 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 8.23 pg/L in the 2nd 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 2.51 mg/L and 0.6 mg/L respectively in the 2nd 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 2.16 pg/L in the 2nd quarter, 2016. Because well TW4-31 is
approximately 200 feet down gradient of TW4-27 that has a nitrate concentration below the GWQS of
1.36 mg/L in the 2nd 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
the 1st Quarter, 2016 and the 2nd quarter, 2016 Chloroform Monitoring Reports for the chloroform
contamination investigation.
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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 1st (January through March)
Quarter 2016, May 19, 2016. (DRC-2016-007208)
EFR, White Mesa Uranium Mill Chloroform Monitoring Report 2nd (April through June) Quarter
2016, August 18, 2016. (DRC-2016-009410)
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 II.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 28)
Historic Summary Of Monitoring Parameters'Up To The 2nd Quarter 2016
Chloroform Contamination Investigation
DUSA White Mesa Mill
Well Parameter
Sampling Event (GWQS)
Carbon Tetrachloride Chloroform Chloromethane Methylene Chloride Chloride Nitrate, Nitrate + Nitrite
(S MIL)170 uq/L)(30 pq/L)(5 pg/L)No GWQS (mg/L)(10 mg/L)
MW-4 (chloroform
pumping well started pumping
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 <1.0 <1.0 45 7.0
3rd Qtr 8/15/07 1.9 2,600 <1.0 <1.0 47 6.2
4th Qtr 10/10/07 1.7 2.300 <1.0 <1.0 45 .. 62
1st Qtr 3/28/08 1.7 2,400 <1.0 <1.0 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 <1.0 <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 1J00 <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 <1.0 <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 1^00 1.42 <1.0 44.3 4.79
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 <1.0 <1.0 43.7 4.54
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 <1.0 <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 28)
Histone Summary Of Monitoring Parameters Up To The 1st Quarter 2016
Chloroform Contamination Investigation
DUSA White Mesa Mill
Well
Sampling Event
Parameter
(GWQS)
Carbon Tetrachloride
(5 ug/L)
Chloroform
(70 pg/L)
Chloromethane
(30 pg/L)
Methylene Chloride
(5 pg/L)
Chloride
No GWQS (mq/L)
Nitrate, Nitrate + Nitrite
(10 mg/L)
MW-26 (forme/ TW4-15)
Chloroform pumping well started
8/8A3
1st Qtr 3/16/05 NA 310 NA NA NA 03
2nd Qtr 5/25/05 NA 442 NA NA NA 02
3rd Qtr 8/31/05 <5 0 960 54 <5 0 NA 02
4th Qtr 12/7/05 <50 1,000 <50 <50 55 03
1st Qtr 3/9/06 <50 1.100 <50 <50 52 02
2nd Qtr 6/14/06 <50 830 <50 <50 52 02
3rd Qtr 7/20/06 <50 2,170 <50 <50 65 1 4
4th Qtr 11/8/06 <1 0 282 <1 0 26 54 03
1st Qtr 2/28/07 <1 0 570 <1 0 55 56 06
2nd Qtr 6/27/07 <1 0 300 <1 0 13 49 04
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 06
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 06
3rd Qtr 9/10/08 <1 0 630 <1 0 24 44 02
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 04
2nd Qtr 6/23/09 <1 0 410 <1 0 12 48 02
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 23
1st Qtr 2/17/10 <1 0 730 <1 0 19 57 02
2nd Qtr 6/14/10 1 2 1,600 <1 0 <1 0 40 68
3rd Qtr 8/16/10 <1 0 2,200 <1 0 21 49 06
4th Qtr 10/15/10 <1 0 970 <1 0 65 65 07
1st Qtr 2/23/11 <1.0 450 <1 0 36 57 05
2nd Qtr 5/31/11 <1 0 1,800 <1 0 1 3 88 04
3rd Qtr 8/17/11 <1.0 720 <1.0 ...........................7.2 58 09
4th Qtr 11/16/11 NA NA NA NA 69 20
(1)12/5/11 <1 0 1,800 <1 0 29 NA NA
(2)1 st 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 25
3rd Qtr 9/4/12 <1 3,100 <1 31 73 26
4th Qtr 10/4/12 <1 1,200 <1 4 68 1 8
1st Qtr 2/11/13 <1 2,120 <1 934 81 9 2 27
2nd Qtr 6/5/13 <1 0 4,030 <1 0 52 4 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 0 138 59 4 0 55
2nd Qtr 5/19/14 <1 0 1,960 <1 0 154 53 4 0 93
3rd Qtr 8/11 /14 <1 0 2,120 87 26 59 07
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 <1 0 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
(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 28)
Historic Summary Of Monitoring Parameters Up To The 1st Quarter 2016
Chloroform Contamination Investigation
DUSA White Mesa Mill
Well
Sampling Event
Parameter
(GWQS)
Carbon Tetrachloride
(5 ng/L)
Chloroform
(70 pg/L)
Chloromethane
(30 Mg/L)
Methylene Chloride
(5 Mg/U
Chloride
No GWQS (mq/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 <1.0 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 <1.6 <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
1st Qtr 2/23/11 <1.0 <1.0 <1.0 <1.0 40 <0.1
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 <1.0 <1.0 33 <0.1
4th Qtr 10/10/12 <1.0 <1.0 <1.0 <1.0 35 <0.1
1st Qtr 2/11/13 <1.6 <1.0 <1.0 <1.0 34.3 <0.1
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 <1.0 <1.0 35.7 <0.1
1st Qtr 1/29/14 <1.0 <1.0 <1.0 <1.0 34 <6.1
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 <1.0 <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 <1.6 <1.0 <1.0 <1.0 36.7 <6.1
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 36.4 <0.1
<1.0 <1.0 <1.0 <1.0 37.7 <0.1
(1) VOCs were resampled because laboratory missed holding time.
(2) As of March 2012 both north and south wild life ponds no longer receiving water
NA = not analyzed
Shaded indicates concentrations exceeding GWQS.
TABLE 1 (4 of 28)
Historic Summary Of Monitoring Parameters Up To The 1st Quarter 2016
Chloroform Contamination Investigation
DUSA White Mesa Mill
Well
Sampling Event
Parameter
(GWQS)
Carbon Tetrachloride
(5 ug/L)
Chloroform
(70 gg/L)
Chloromethane
(30 gg/L)
Methylene Chloride
(5 gg/L)
Chloride
No GWQS (mg/L)
Nitrate, Nitrate + Nitrite
(10 mg/L)
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 <1.6 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 . 1,4Q0 <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 <1.0 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 <1.6 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 1J40 <1.0 <1.0 38.7 6.31
(2)1 st 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 1.55ist Qtr 3/9/16 <1.6 974 <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
_£1]_As of March_2012_both_north and_south wi|d lif_ej>onds no longer receiving water.
P2.cNorofonT) £um^2_\^lljt£rt«nnjn_4/15___
NA = not analyzed
Shaded indicates concentrations exceeding GWQS.
Bold and italics indicates the MDL exceeded the GWQS.
TABLE 1 (5 of 28)
Historic Summary Of Monitoring Parameters Up To The 1st Quarter 2016
Chloroform Contamination Investigation
DUSA White Mesa Mill
Well
Sampling Event
Parameter
(GWQS)
Carbon Tetrachloride Chloroform Chloromethane Methylene Chloride Chloride Nitrate, Nitrate + Nitrite
(5 Ufl/L)(70 aa/L)(30 ua/L)(5 aa/L)No GWQS (mg/L)(10 mg/L)
TW4-2 (chloroform pumptng
well starting 1/14/15)
1st Qtr 3/16/05 NA 3,700 NA NA NA 7.7
2nd Qtr 5/25/05 NA 3,750 NA NA NA 8.6
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 <10 54 7.3
2nd Qtr 6/27/07 2.5 3,000 <1.0 <1.0 50 7.8
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 6.9
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 <1.0 <1.0 44 6.4
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 6.41st Qtr 3/3/16 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 7.6
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(iTlst Qtr i/24/12 2 2,500 <1.0 <1.0 49 7.1
2nd Qtr 6/14/12 2.1 2,500l <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 .............1^0 <1.0 <1.0 46 8.1
2nd Qtr 6/19/13 2.65 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 1.4 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)1 st 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
of March_2012_both_north and_soulh wijd lifejgonds no longer receiving water
j2J_chlorofomi £um pin^we ll_sta rtedjnJ _________
NA = not analyzed
Shaded indicates concentrations exceeding GWQS.
Bold and italics indicates the MDL exceeded the GWQS.
TABLE 1 (6 of 28)
Historic Summary Of Monitoring Parameters Up To The 1st 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)
Chloride
No GWQS (mg/L)
Nitrate, Nitrate + Nitrite
(10 mg/L)Memyiene onionae
(5 pq/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 <1.0 <1.0 23 1.5
1st Qtr 2/28/07 <1.0 <1.0 <i.o <1.0 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 <1.0 <1.0 24 3.1
4th Qtr 10/10/07 <1.0 <1.0 <1.0 <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 <1.0 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 <i.6 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 2/7/13 <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 <1.0 <1.0 <1.0 24.9 6.66
2nd Qtr 5/21/14 <1.0 <1.0 <1.0 <1.0 24.4 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
111AS of March_2012_both_north and_south wild lif_e_£onds no Jonger receiving water.
NA = not analyzed
Shaded indicates concentrations exceeding GWQS.
TABLE 1(7 of 28)
Historic Summary Of Monitoring Parameters Up To The 1st Quarter 2016
Chloroform Contamination Investigation
DUSA White Mesa Mill
Well
Sampling Event
Parameter
(GWQS)
Carbon Tetrachloride
(5ug/L)
Chloroform
(70 iiq/L)
Chloromethane
(30 |jg/L)
Methylene Chloride
(Spg/L)
Chloride
No GWQS (mg/L)
Nitrate, Nitrate + Nitrite
(10 mg/L)
TW4-4 (chloroform pumping
well stared in Isfqfr 2010)
1stQtr3/16/05 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 <1.6 41 7.6
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
(1|1st 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 <i.6 <1.6 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 <1.0 <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 <1.6 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 6.7l2nd Qtr 5/23/16_____1.21 1,780 <1.0 <1.0 41.9
JJ2.AS of March_20_12_both_north and_south wild lif_e_£onds no longer receiving water
_£2]_Ch loroformj>um£incj_ we l[_sta re_d_in_t st_cjtr 2010J___
NA = not analyzed
Shaded indicates concentrations exceeding GWQS.
Bold and italics indicates the MDL exceeded the GWQS.
TABLE 1 (8 of 28)
Historic Summary Of Monitoring Parameters Up To The 1st Quarter 2016
Chloroform Contamination Investigation
DUSA White Mesa Mill
Well
Sampling Event 4
Parameter
(GWQS)
Carbon Tetrachloride
(5Mg/L)
Chloroform
{70 pg/L)
Chloromethane
(30Mg/L)
Methylene Chloride
(Sug/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 <1.0 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 6.8
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
(1) 12/7/11 <1.0 7.9 <1.0 <1.0 NA NA
(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 14.4 <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
(1) VOCs were resampled because laboratory missed holding time.
J2]_As of March_2012_both_north and_south wild.Mfeponds nojonger receiving water
NA = not analyzed
Shaded indicates concentrations exceeding GWQS.
TABLE 1 (9 of 28)
Historic Summary Of Monitoring Parameters Up To The 1st 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 0.6
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 <1.0 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 <1.6 280 <1.6 <1.6 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 <1.0 <1.0 40 0.7
2nd Qtr 5/26/11 <1.0 9.6 <1.0 <1.0 42 0.3
3rd Qtr 8/17/11 <1.0 16 <1.0 <1.0 39 0.3
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 <1.6 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 40.2 1.5
1st Qtr 1/29/14 <1.0 5.7 <1.0 <1.0 40.6 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 <1.0 <1.0 47 6.8
4th Qtr 10/29/15 <1.0 843 <1.0 <1.0 40.2 5.6
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
(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.
J4J_As of Marchj?01£both_north and_south wild lifejjonds nojoncjer receiving water.
^Chloroform^i^n^n^well TW4-4 located appoximately 3stared in 1st qtr 2010)
NA = not analyzed
Shaded indicates concentrations exceeding GWQS.
TABLE 1 (10 of 28)
Historic Summary Of Monitoring Parameters Up To The 1st Quarter 2016
Chloroform Contamination Investigation
DUSA White Mesa Mill
Well
Sampling Event
Parameter
(GWQS)
Carbon Tetrachloride
15 pg/L)
Chloroform
(70 pg/L)
Chloromethane
(30 Mg/L)
Methylene Chloride
(5 pg/L)
Chloride
No GWQS (mg/L)
Nitrate, Nitrate + Nitrite
(10 mg/L)
TW4-7
1st Qtr 3/16/05 NA 3,100 NA NA NA 5.2
2nd Qtr 5/25/05 NA 2,700 NA NA NA 5.4
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 2J60 <1.0 <1.0 49 4.6
1st Qtr 2/28/07 1.1 1,830 <1.0 <i.6 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 iOOO <1.0 <1.0 37 3.8
(1)1st Qtr 1/19/12 <1.0 1,000 <1.0 <1.0 37 3.9
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 3.8
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 36.4 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 4.24
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 , 8»<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
of March_2012_both_north and_south wild jifejjonds noJonger receiving water.
NA = not analyzed
Shaded indicates concentrations exceeding GWQS.
Bold and italics indicates the MDL exceeded the GWQS.
TABLE 1 (11 of 28)
Historic Summary Of Monitoring Parameters Up To The 1st Quarter 2016
Chloroform Contamination Investigation
DUSA White Mesa Mill
Well
Sampling Event
Parameter
(GWQS)
Carbon Tetrachloride
_______(5 U9/L)_______
Chloroform
(70 pg/L)
Chloromethane
(30 pg/L)
Methylene Chloride
(5 Mg/L)
Chloride
No GWQS (mg/L)
Nitrate, Nitrate + Nitrite
(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 <1.0 <1.0 41 <1.0
1st Qtr 3/9/06 <1.0 1.3 2.1 <i.6 39 6.3
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 <1.0 <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 <1.0 <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 <1.6 46 6.1
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 <1.0 <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 <1.6 <1.6 <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)1 st 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 <1.6 <1.6 <1.0 <1.0 46.6 0.41
2nd Qtr 5/30/13 <1.0 <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 <1.0 961 <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 <i.6 54.2 2.48
2nd Qtr 6/8/16 <1.0 595 <1.0 <1.0 58.7 2.14
(1) VOCs were resampled because laboratory missed holding time.
(2) Resampled to verify chloroform concentration that was collected on 1/23/14.
_p]_As of March_2012_ both_ north and_s_outh wild Ijfejjonds no Jo nger receiving water
NA = not analyzed
Shaded indicates concentrations exceeding GWQS.
TABLE 1 (12 of 28)
Historic Summary Of Monitoring Parameters Up To The 1st Quarter 2016
Chloroform Contamination Investigation
DUSA White Mesa Mill
Well
Sampling Event
Parameter
[GWQS)
Carbon Tetrachloride
(Spg/L)
Chloroform
(70 pg/L)
Chloromethane
(30 pfl/L)
Methylene Chloride
(5 na/L)
Chloride
No GWQS (mg/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 0.6
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 <1.0 <1.0 58 1.99
1 st Qtr 3/4/09 <1.0 <1.0 <1.6 <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 <1.0 <1.0 34 1.8
1st Qtr 2/17/11 <1.0 <1.0 <1.6 <1.0 41 1.3
2nd Qtr 5/25/11 <1.0 <1.0 <1.0 <1.0 38 3.4
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
(1J 12/7/11 <1.0 <1.0 <1.0 <1.0 NA
(2)1 st Qtr 1/18/12 <1.0 <1.0 <10 <1.0 28 2.3
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 <1.6 <1.0 20.6 4.49
2nd Qtr 5/30/13 <1.0 <1.0 <1.0 <1.0 21.4 4.49
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 4.87
1st Qtr 1/29/14 <1.0 <1.0 <1.0 <1.0 22 4.36
2nd Qtr 5/22/14 <1.0 6.9 <1.0 <1.0 24 3.44
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 <1.6 33.6 2.51
2nd Qtr 6/8/16 <1.0 ™.2l <1.0 <1.0 35.1 2.16
(1) VOCs were resampled because laboratory missed holding time.
J2]_As of March_2012_both_north and_south wild. NfejDonds noJonger receiving water
NA = not analyzed
Shaded indicates concentrations exceeding GWQS.
TABLE 1 (13 of 28)
Historic Summary Of Monitoring Parameters Up To The 1st Quarter 2016
Chloroform Contamination Investigation
DUSA White Mesa Mill
Well
Sampling Event
Parameter
(GWQS)
Carbon Tetrachloride
(5Mg/L)
Chloroform
(70 pg/L)
Chloromethane
(30 pg/L)____
Methylene Chloride
(5 gg/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 <1.0 <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 <1.0 460 <1.0 <1.6 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 yoo <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)1 st 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 <1.6 154 <1.0 <1.0 49.1 12
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
_£1J_As of March_2012_boUT_north and_south wild_ lif_ej)onds noJonger receiving water.
NA = not analyzed
Shaded indicates concentrations exceeding GWQS.
TABLE 1 (14 of 28)
Historic Summary Of Monitoring Parameters Up To The 1st Quarter 2016
Chloroform Contamination Investigation
DUSA White Mesa Mill
Well
Sampling Event
Parameter
(GWQS)
Carbon Tetrachloride
(5 gg/L)
Chloroform
(70 pq/L)
Chloromethane
(30 pq/L)
Methylene Chloride
(5 pg/L)
Chloride
No GWQS (mg/L)
Nitrate, Nitrate + Nitrite
(10 mg/L)
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 9.4
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 io.6
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 <1.0 <1.0 53 10.2
4th Qtr 10/10/07 1.6 ..........4.400 <1.0 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 geo <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 <1.0 <1.0 49 6.4
1st Qtr 2/23/11 <1.0 1,000 <1.0 <1.0 46 6.5
2nd Qtr 6/1/11 <1.0 930 <1.0 <1.0 49 7.3
3rd Qtr 8/17/11 <1.0 too <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 W5 <1.0 <1.0 46.6 7.8
4th Qtr 11/13/13 <1.0 874 <1.0 <1.0 ...46,7 8.01
1st Qtr 2/5/14 5.19 785 <1.0 <1.0 48.5 8.47
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)1 st 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
l1i/£ 2l March_2012_ both_fTOrth andsouth wild ljfe_gonds no longer receiving water
J2J_Chloroform_£um£[n£ well_staited_1/14/15.__________
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 28)
Historic Summary Of Monitoring Parameters Up To The 1st Quarter 2016
Chloroform Contamination Investigation
DUSA White Mesa Mill
Well
Sampling Event
Parameter
(GWQS)
Carbon Tetrachloride
(5ug/L)
Chloroform
(70 pg/L)
Chloromethane
popg/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 2.6 <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 <1.0 <1.0 22 2.5
1st Qtr 3/11/09 <1.0
<1.6 <1.6 <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 <1.6 <1.6 <i.6 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 Mi
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 <1.0 <1.0 41.6 18.4
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 <1.6 <1.0 <1.0 <i.o 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
_£1]_As of March_2012_both_north and_south wild hfejjonds noJonger receiving water
NA = not analyzed
Shaded indicates concentrations exceeding GWQS.
TABLE 1 (16 of 28)
Historic Summary Of Monitoring Parameters Up To The 1st 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 <1.0 <1.0 33 0.8
1st Qtr 2/28/07 <1.0 <1.0 <1.0 <1.0 59
4.6
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 <1.0 <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 5.6
4th Qtr 10/15/10 <1.0 <1.0 <1.0 <1.0 55 5.8
1st Qtr 2/15/11 <1.0 <1.6 <1.0 <1.0 60 5.5
2nd Qtr 5/25/11 <1.0 <1.0 <1.0 <1.0 56 6.4
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 <1.6 <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 69.4 7.97
2nd Qtr 5/25/16 <10 <1.0 <1.0 <10 71.8 5.87
_[12_As of March_2012_both_north and_south wild_life_gonds no jonger receiving water
NA = not analyzed
Shaded indicates concentrations exceeding GWQS.
TABLE 1 (17 of 28)
Historic Summary Of Monitoring Parameters Up To The 1st 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 ng/L)
Chloride
No GWQS (mg/L)
Nitrate, Nitrate + Nitrite
(10 mg/L)
TW4-14
1 st 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 <1.6 57 6.4
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 <1.0 <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 <1.0 <1.0 <1.0 <1.6 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 <1.6 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
_[1J_As of March_2012_ both_ north andsouth wi|d life_£onds no Jonger receiving water
NS = not sampled
Shaded indicates concentrations exceeding GWQS.
TABLE 1 (18 of 28)
Historic Summary Of Monitoring Parameters Up To The 1st Quarter 2016
Chloroform Contamination Investigation
DUSA White Mesa Mill
Well
Sampling Event
Parameter
(GWQS)
Carbon Tetrachloride
(5 MIL)
Chloroform
(70 pg/L)
Chloromethane
(30 pg/L)
Methylene Chloride
(5 pg/L)
Chloride
No GWQS (mg/L)
Nitrate, Nitrate + Nitrite
(10 mg/L)
TW4-16
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 <0.1
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 2.4 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 4.4
1st Qtr 3/28/08 <1.0 it <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 <1.6 <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 52
1st Qtr 2/24/10 <1.0 <1.0 <1.0 <1.0 77 42
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
11112/7/11 <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 <1.0 <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 <1.0 <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
(1) VOCs were resampled because laboratory missed holding time.
(2) VOCs were resampled
(3|As of March 2012_both_north_a_nd_south wild Mfe_ponds_no_longej_receiving_\
NA = not analyzed
Shaded indicates concentrations exceeding GWQS.
TABLE 1 (19 of 28)
Historic Summary Of Monitoring Parameters Up To The 1st Quarter 2016
Chloroform Contamination Investigation
DUSA White Mesa Mill
Well
Sampling Event
Parameter
(GWQS)
Carbon Tetrachloride
(5M9/L)
Chloroform
(70Mg/L)
Chloromethane
OOpg/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 <1.6 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 <1.6 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 <1.0 41 <1.0 <1.0 36.2 12.1
4th Qtr 11/13/13 <1.0 44.3 <1.0 <1.0 37.1 U2
1st Qtr 1/30/14 <1.0 6.93 <1.6 <1.6 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 <1.6 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 <i.6 40.7 5.96
2nd Qtr 6/8/16 <1.0 60 <1.0 <1.0 43.8 5.45
(1) VOCs were resampled because laboratory missed holding time
(2J_As of March 2012 both^north_and_south wild jife^pondsno^longer^receiving^water^
NA = not analyzed
Shaded indicates concentrations exceeding GWQS.
TABLE 1 (20 of 28)
Historic Summary Of Monitoring Parameters Up To The 1st Quarter 2016
Chloroform Contamination Investigation
DUSA White Mesa Mill
Well
Sampling Event
Parameter
(GWQS)
Carbon Tetrachloride
(5 ug/L)
Chloroform
(70 gq/L)
Chloromethane
(30 gq/L)
Methylene Chloride
(5 gq/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 <1.6 133 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 <1.0 <1.0 131 2.2
2nd Qtr 6/25/08 <1.0 1,000 <1.0 <1.0 128 2.8
3rd Qtr 9/10/08 8.6 3,600 <1.0 <1.0 113 35i
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 <1.6 <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
(1) 12/5/11 5.4 2,200 <1.0 <1.0
(2)1 St Qtr 1/23/12 1.5 650 <1.0 <i.6 138 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 <1.0 <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 <1.0 <1.0 148 3.0
3rd Qtr 9/3/13 20.7 8,100 <1.0 <1.0 179 17.6
4th Qtr 10/29/13 642 942 <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 7,840 5.46 <1.0 252 106
1st Qtr 3/9/16 13.5 7,780 1.4 <1.0 276 15.70
12nd Qtr 5/26/16 23.1 ---------12^00 <1.0 <1.0 204 1.27
(1) VOCs were resampled because laboratory missed holding time.
j2)As of March 2012 _both_n orth_a_n d_s outh wMd s_no_ I on£er_recei vin g_ wa te r_
NA = not analyzed
Bold and italics indicates the MDL exceeded the GWQS.
Shaded indicates concentrations exceeding GWQS.
TABLE 1 (21 of 28)
Historic Summary Of Monitoring Parameters Up To The 1st 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 39jP00 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.Q0Q <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 1.5 132
6.90
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 ii 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 ........... 3600 <1.0 3.1 207 6.50
4th Qtr 11/16/11 72 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 11.01)
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 8.65
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 *0.6 33,700 <1.0 318
XILVOCswere_resam£led becausejabqratOf)r_mis£ed_holdin^tjme.
(2) As of March 2012 both north and south wild life ponds no longer receiving water.
_£3]_Chloroform_£um£in£ 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 28)
Historic Summary Of Monitoring Parameters Up To The 1st Quarter 2016
Chloroform Contamination InvestigationDUSAWhite Mesa Mill'
Well
Sampling Event
Parameter
(GWQS)
Carbon Tetrachloride
(5 pg/L)
Chloroform
(70 pg/L)
Chloromethane
(30 pg/L)
Methylene Chloride
(5 ug/L)
Chloride
No GWQS (mg/L)
Nitrate, Nitrate + Nitrite
(10 mg/L)
well 6/9/15)1st Qtr 3/16/05 Monitor well was not installed
2nd Qtr 5/25/05 NA 192 NA NA NA .................................... 14.9
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 f 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 <10 <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 <1.0 281 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 <i.6 228 '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 „ . J,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
(1) 12/7/11 6.7 ................390 <1.0 <1.0
(2)1st Qtr 1/19/12 6.4 420 <1.0 <1.0 228 15.0
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 . . 140
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 ni3rd Qtr 8/27/14 <1.0 204 <1.0 <1.0 230 7.1
4th Qtr 10/29/14 1.04 2»<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
(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. j3jchloroform_£um£in£ welTstartede/g/Ts'
NA = not analyzed
Shaded indicates concentrations exceeding GWQS.
TABLE 1(23 of 28)
Historic Summary Of Monitoring Parameters Up To The 1st Quarter 2016
Chloroform Contamination Investigation
DUSA White Mesa Mill
Well
Sampling Event
Parameter
___(GWQS)
Carbon Tetrachloride
(5 Mg/L)
Chloroform
(70 UO/L)
Chloromethane
(30 pg/L)
Methylene Chloride
(5 gg/L)
Chloride
No GWQS (mq/L)
Nitrate, Nitrate + Nitrite
(10 mg/L)
TW4-22 (nitrate
pumping well started 1/26/13)
1st Qtr 3/16/05 Monitcr 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 <1.0 <1.0 347 20.9
2nd Qtr 6/27/07 <1.0 740 <1.0 <1.0 273
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 .......I:::**<1.0 <1.0 175 17.6
1st Qtr 3/3/10 <1.0 2,200 <1.0 <1.0 427 ......................................m
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.C
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 .......................................170
3rd Qtr 8/17/11 <1.0 450 <1.0 <1.0 120 15.C
4th Qtr 11/16/11 NA NA NA NA 174 19.0
(1) 12/7/11 <1.0 400 <1.0 <1.0 NA NA
(2)1st Qtr 1/19/12 <1.0 200 <1.0 <1.6 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)1st 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 6.66 12,400 <1.0 <1.0 614 472
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 "MS
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 ______ 1,530 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 1 MW<1.0 <1.0 598
(1) VOCs were resampled because laboratory missed holding time.
(2] _As of March M12_bothjiorth_and_south wild Hfepondsno_longer_receivin£ water.
P2C^loroform_gum£^n£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 28)
Historic Summary Of Monitoring Parameters Up To The 1st Quarter 2016
Chloroform Contamination Investigation
DUSA White Mesa Mill
Well
Sampling Event
Parameter
(GWQS)
Carbon Tetrachloride
(5 pg/L)
Chloroform
(70 tig/L)
Chloromethane
(30 gg/L)
Methylene Chloride
(5 pg/L)
Chloride
No GWQS (mg/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 <0.1
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 <i.6 <1.6 <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 <1.0 <1.0 <1.0 44 <0.1
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 <1.6 <1.0 40 <0.1
2nd Qtr 5/31/12 <1.0 <1.0 <1.0 <1.0 44
<0.1 I
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 <6.1
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 <1.6 <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 <i.6 49.1 <0.1
2nd Qtr 5/26/16 <1.0 <1.0 <1.0 <1.0 50.4 <0.1
J1J_As of March M12_both_north_a_ndsouth wijd jife_pondsno_lon£er_receiving^water_
NA = not analyzed
Shaded indicates concentrations exceeding GWQS.
TABLE 1 (25 of 28)
Historic Summary Of Monitoring Parameters Up To The 1st Quarter 2016
Chloroform Contamination Investigation
DUSA White Mesa Mill
Well
Sampling Event
Parameter
(GWQS)
Carbon Tetrachloride
<5|Jg/L)
Chloroform
(70Mg/L)
Chloromethane
(SOpg/L)
Methylene Chloride
(5M9/L)
Chloride
No GWQS (mg/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 46.3
3rd Qtr 9/10/08 <1.0 2.9 <1.0 <1.0 1180 36.4
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
(1) 12/7/11 <1.0 1.2 <1.0 <1.0 NA NA
(2)1 st Qtr 1/16/12 <1.0 <1.0 <1.6 <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 ________________________________J*
(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 36.0
3rd Qtr 8/11/14 <1.0 76.3 <1.0 <1.0 1150 31.6
4th Qtr 10/21/14 <1.0 25.8 <1.0 <1.0 1050 35.7
1st Qtr 3/9/15 <1.6 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 ___________________296
1st Qtr 3/9/16 <1.0 22.8 <1.0 <1.0 989 29.1
2nd Qtr 5/23/16 <1.0 _____________69^<1.0 <1.0 771 24.2
(1) VOCs were resampled because laboratory missed holding time.
J2)_As of March 2012_bo_th_north_a_nd_south wild Nfe_ponds_no_Ion£ej_receivmg_water_
_£3j[_Chloroform^um£in£well started 1/26/13.
NA = not analyzed
Shaded indicates concentrations exceeding GWQS.
TABLE 1 (26 of 28)
Historic Summary Of Monitoring Parameters Up To The 1st Quarter 2016
Chloroform Contamination Investigation
DUSA White Mesa Mill
Well
Sampling Event
Parameter
(GWQS)
Carbon Tetrachloride
(5 ub/L)
Chloroform
(70 pg/L)
Chloromethane
(30 pg/L)
Methylene Chloride
(5 MB/L)
Chloride
No GWQS (mq/L)
Nitrate, Nitrate + Nitrite
(10 mg/L)
TW4-25 (nitrate
pumping well 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 <1.6 <1.6 <1.6 <1.6 328 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 is
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 <1.6 <10 <1.6 304 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 <1.0 <1.0 334 17
4th Qtr 10/3/12 <1.0 <1.0 <1.0 <1.0 338 11
(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 88.6 6.1
1st Qtr 1/27/14 <1.0 <1.0 <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 <1.6 310 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
(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_gum£in£well started 1/26/13.
NA = not analyzed
Shaded indicates concentrations exceeding GWQS.
TABLE 1 (27 of 28)
Historic Summary Of Monitoring Parameters Up To The 1st Quarter 2016
Chloroform Contamination Investigation
DUSA White Mesa Mill
Well
Sampling Event
Parameter
(GWQS)
Carbon Tetrachloride
(5 ug/L)
Chloroform
(70 pg/L)
Chloromethane
(30 pg/L)
Methylene Chloride
(5 pg/L)
Chloride
No GWQS (mg/L)
Nitrate, Nitrate + Nitrite
(10 mg/L)
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 liii
4th Qtr 11/16/11 NA NA NA NA 26 10.0
<') 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 <1.0 14.5 13.6
3rd Qtr 9/5/13 <1.0 2.81 <1.0 <1.0 17.6 117
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 <1.6 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 <1.0 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
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 <1.0 <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 <1.0 <1.0 <1.0 <1.0 19 277
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 31.8 317
2nd Qtr 5/21/14 <1.0 <1.0 <1.0 <1.0 20.6 31.1
3rd Qtr 8/13/14 <1.0 <1.0 <1.0 <1.0 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 2.11 <1.0 <1.0 28 25.0
2nd Qtr 5/26/16 <1.0 3.16 <1.0 <1.0 21.2 28.7
TW4-28
2nd Qtr 6/19/13 <1.0 <1.0 <1.0 <1.0 44.6 14.9
3rd Qtr 8/29/13 <1.0 <1.0 <1.0 <1.0 45.3 17.3
4th Qtr 11/6/13 <1.0 <1.0 <1.0 <1.0 45.3 167
1st Qtr 1/22/14 <1.0 <1.0 <1.0 <1.0 47.8 16.9
2nd Qtr 5/21/14 <1.0 <1.0 <1.0 <1.0 45.7 16.5
3rd Qtr 8/13/14 <1.0 <1.0 <1.0 <1.0 50 147
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
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 <1.6 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 2.74ist 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
(1) VOCs were resampled because laboratory missed holding time.
NA = not analyzed
Shaded indicates concentrations exceeding GWQS.
TABLE 1 (28 of 28)
Historic Summary Of Monitoring Parameters Up To The 1st Quarter 2016
Chloroform Contamination Investigation
DUSA White Mesa Mill
Well Parameter
Sampling Event (GWQS)
Carbon Tetrachloride Chloroform Chloromethane Methylene Chloride Chloride Nitrate, Nitrate + Nitrite
(5pg/L)______(70 pg/L) (30 pg/L)____(5 pg/L)No GWQS (mg/L) (10 mg/L)
TW4-30
2nd Qtr 6/19/13 <1.0 <1.0 <1.0 <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 Otr 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 <1.0 <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 <1.0 <1.0 40.2 2.04
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 <1.0 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 30.4 0.916
4th Qtr 10/21/15 <1.0 <y><1.0 <1.0 29.1j 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
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 <1.0 <1.0 62.7 1.21
3rd Qtr 9/2/15 <1.0 <1.0 <1.0 <1.0 59.6 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
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 <1.0 49.7 2.06
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 <1.6 <i.6 <1.6 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 <1.6 <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 <1.0 18 0.605
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 <1.0 <1.0 34.1 0.351
1st 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 <i.6 35.4 6.52*1
2nd Qtr 5/26/16 <1.0 <1.0 <1.0 <1.0 35.4 0.631
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
TW4-37 (chloroform 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 l16.200 3.57 1.17 389 27.9
Shaded indicates concentrations exceeding GWQS.
(1) VOCs were resampled because laboratory missed holding time.
Table 2
Summary of QA/QC Samples
1st Quarter 2016
Parameter GWQS Duplicate of TW4-28 Duplicate of MW-32
TW4-28 TW4-65 RPD MW-32 TW4-70 RPD
Chloride none 61.6 61.4 0.3 36.7 36.4 0.8
Nitrate + Nitrite (as N)10 mg/L 34.0 32.6 4.2 <0.1 0.119 nc
Chloroform 70 (jg/L <1.0 <1.0 nc <1.0 <1.0 nc
Carbon tetrachloride Spg/L <1.0 <1.0 nc <1.0 <1.0 nc
Chloromethane 30 (jg/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
2nd Quarter 2016
Parameter GWQS Dup icate of TW4-12 Duplicate of MW-32
TW4-12 TW4-65 RPD MW-32 TW4-70 RPD
Chloride none 66.4 67 -0.9 37.2 37.7 -1.3
Nitrate + Nitrite (as N)10 mg/L 30.7 113 -114.5 <0.1 <0.1 nc
Chloroform 70 pg/L <1.0 <1.0 nc <1.0 <1.0 nc
Carbon tetrachloride 5 pg/L <1.0 <1.0 nc <1.0 <1.0 nc
Chloromethane 30 pg/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
label 3
Chloroform Mass Removal Calculations for the 1st 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)1,240 2,650 0 974 1,970 1,190 2,660 7,780 21,600 390 6,070 22.8 0 17,500
Chloroform (g/L)1.24E-03 2.65E-03 0.00E+00 9.74E-04 1.97E-03 1.19E-03 2.66E-03 7.78E-03 2.16E-02 3.90E-04 6.07E-03 2.28E-05 0.00E+00 1.75E-02
Chloroform (Ibs/L)2.74E-06 5.86E-06 0.00E+00 2.15E-06 4.35E-06 2.63E-06 5.88E-06 1.72E-05 4.77E-05 8.62E-07 1.34 E-05 5.04E-08 0.00E+00 3.87E-05
Chloroform (Ibs/gal)1.04E-05 2.22E-05 0.00E+00 8.15E-06 1.65E-05 9.95E-06 2.22E-05 6.51 E-05 1.81E-04 3.26E-06 5.08 E-05 1.91E-07 0.00E+00 1.46E-04
Total gallons pumped 1st qtr 2016 90,882 19,151 47,670 19,256 20,945 57,274 3,676 116,597 14,354 125,513 24,518 100,063 115,483 111,591
lbs of chloroform removed 0.94 0.42 0.00 0.16 0.35 0.57 0.08 7.59 2.59 0.41 1.24 0.02 0.00 16.33
Gallons of chloroform removed 0.08 0.03 0.00 0.01 0.03 0.05 0.01 0.62 0.21 0.03 0.10 0.002 0.00 1.33
total lbs of chloroform removed 30.70
total gallons of chloroform removed 2.50
1) Assuming that the chloroform concentration result for the 1st quarter monitoring event is the average chloroform concentration for the entire quarter.
Chloroform Pumping Wells
Nitrate Pumping Wells
2nd 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
<1>Chloroform (ug/L)1,580 2,220 0 1,140 2,070 1,780 3,340 12,600 33,700 545 8,570 69.6 0 16,200
Chloroform (g/L)1.58E-03 2.22E-03 0.00E+00 1.14E-03 2.07E-03 1.78E-03 3.34E-03 1.26E-02 3.37E-02 5.45E-04 8.57E-03 6.96E-05 0.00E+00 1 62E-02
Chloroform (Ibs/L)3.49E-06 4.90E-06 0.00E+00 2.52E-06 4.57E-06 3.93E-06 7.38E-06 2.78E-05 7.45E-05 1.20E-06 1.89E-05 1.54E-07 0.00E+00 3.58E-05
Chloroform (Ibs/gal)1 32E-05 1.86E-05 0.00E+00 9.53E-06 1.73E-05 1.49E-05 2.79E-05 1.05E-04 2.82E-04 4.56E-06 7.17E-05 5.82E-07 0.00E+00 1 35E-04
Total gallons pumped 2nd qtr 2016 96,541 22,106 50,783 19,588 20,624 61,378 3,760 123,768 15,818 132,249 26,506 65,234 12,606 119,241
lbs of chloroform removed 1.28 0.41 0.00 0.19 0.36 0.91 0.11 13.04 4.46 0.60 1.90 0.04 0.00 16.15
Gallons of chloroform removed 0.10 0.03 0.00 0.02 0.03 0.07 0.01 1.06 0.36 0.05 0.15 0.003 0.00 1.31
total lbs of chloroform removed 39.44
total gallons of chloroform removed 3.21
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