DRC-2017-009016 - 0901a0688077df1e

State of Utah
GARY R. HERBERT
Governor
SPENCER J. COX
Lieutenant Governor
Department of
Environmental Quality
Alan Matheson
Executive Director
ypt-zotT-oow i b
DIVISION OF WASTE MANAGEMENT
AND RADIATION CONTROL
Scott T Anderson
Director
MEMORANDUM
TO:
FROM:
DATE:
Phil Goble /?* u/yn
Dean Henderson Wk "M”
November 6, 2017
SUBJECT: Review of the 2nd Quarter, 2017 Chloroform Monitoring Reports for the Chloroform
Contamination Investigation, Energy Fuels Resources (USA) Inc. (“EFR“) White Mesa
Uranium Mill, near Blanding, Utah
The Utah Division of Waste Management and Radiation Control (“Division”) has reviewed the August
21, 2017 2nd Quarter 2017 Chloroform Monitoring Report (“Report”) for the Chloroform Contamination
Investigation. For the review of this report the following regulatory enforcement documents were used:
• EFR issued Ground Water Quality Discharge Permit No. UGW370004 (“Permit”). Permit
version that was signed on August 24, 2012.
• The EFR Quality Assurance Plan (“QAP”) August 15, 2017 (Revision. 7.3)
• The EFR Groundwater Corrective Action Plan (“GCAP”) September 14, 2015 (Revision 0)
• Utah Department of Environmental Quality Division of Radiation Control Guidance for
Groundwater Split Sampling Collection at Uranium Mill Operations, August 7, 2007.
REVIEW
Monitor Well Sampling
The following monitor wells were sampled as required in the QAP (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
TW4-1 TW4-11 TW4-23 TW4-33
TW4-2 TW4-12 TW4-24 TW4-34
195 North 1950 West • Salt Lake City, UT
Mailing Address' P O. Box 144880 • Salt Lake City, UT 84114-4880
Telephone [phone] • Fax [phone] -TDD (801) 5364414
mcw.deq utnh.gov
Printed on 100% recycled paper
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TW4-3 TW4-13 TW4-25 TW4-35
TW4-4 TW4-14 TW4-26 TW4-36
TW4-5 TW4-16 TW4-27 TW4-37
TW4-6 TW4-18 TW4-28 TW4-38
TW4-7 TW4-19 TW4-29 TW4-39
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, TW4-3, TW4-5, TW4-7, TW4-8, TW4-9, TW4-12, TW4-13, TW4-16, TW4-18,
TW4-23, TW4-28, TW4-32, and TW4-38.
2. Purging a well to dryness and stability of field parameters for pH, specific conductivity, and
water temperature only after recovery:
Wells: TW4-6, TW4-10, TW4-14, TW4-26, TW4-27, TW4-29, TW4-30, TW4-31, TW4-33,
TW4-34, TW4-35, and TW36.
3. Pumping Wells: MW-4, MW-26, TW4-1, TW4-2, TW4-4, TW4-11, TW4-19, TW4-20, TW4-
21, TW4-22, TW4-24, TW4-25, TW4-37, and TW4-39.
The water samples for the above wells were analyzed for the following constituents as required in the
QAP:
Chloroform Chloride
Chloromethane Methylene chloride
Carbon tetrachloride Nitrate + Nitrite as Nitrogen.
The analytical methods used is consistent with the requirements of the QAP.
Holding Times
The water samples method holding times for each parameter for samples collected at each monitor well
were received and analyzed within the required holding times in the QAP.
Receipt Temperature
Water samples were received within the required QAP temperature limit of 6° C.
Detection Limits
Analytes were measured and reported to the required reporting limits. However, several sets of sample
results had the reporting limit raised for at least one analyte due to matrix interference and/or sample
dilution. In all cases the reported value for the analyte was higher than the increased detection limit.
EFR Duplicate Sample Comparison
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Three duplicate samples were collected. Monitor well TW4-16 and its duplicate sample TW4-75, TW4-
28 and its duplicate sample TW4-65, and TW4-38 and its duplicate sample TW4-70. All analytical
results for the three sample/duplicate pairs were within the 20% acceptance limits (see Table 2 below).
Groundwater Head Monitoring
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, PGA, P-4 and P-5.
• MW-20 and MW-22.
• Nitrate monitoring wells.
• The DR piezometers which were installed during the Southwest Hydrologic Investigation.
In addition, weekly and monthly depth to groundwater measurements were taken in pumping wells
MW-4, MW-26, TW4-1, TW4-2, TW4-4, TW4-11, TW4-19, TW4-20, TW4-21, TW4-22, TW4-24,
TW4-25, TW4-37, TW4-38, TW4-39 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 2nd Quarter 2017 is 19.6 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 1372 lbs. in the 2nd Quarter, 2017. As per
Part III.B.2 of the GCAP, the electronic files were used in 2nd Quarter, 2017 to calculate the mass
estimates. The following files were used to calculate the estimated chloroform mass within the
chloroform plume:
• Excel spreadsheet that included: well name; well location (easting and northing); Laboratory
reported concentration in pg/1 in the 2nd quarter 2017 and corresponding log equivalent values.
• Surfer® griding parameters: kriging parameters: SURFER™ default parameters (point kriging,
linear variogram, slope = 1, no anisotropy [anisotropy = 1], no search constraints; min x, max x
(UTME[m]): 631900, 633043; min y, max y (UTME[m]): 4154240, 4155550.64; grid spacing in
x, y (m): 15.24, 15.24
• Surfer chloroform concentration grid file.
• Concentration GE 70 Grid file
• Intermediate Surfer Grid Files: water level grid; aquifer base grid; saturated thickness grid
Based on the review of these files it appears that the date entered and generated is appropriate to
calculate an estimated chloroform mass within the chloroform plume and EFR followed Part III.B.2 and
Appendix A of the GCAP.
Reporting
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The Report included the following information as required in the QAP:
a) Introduction
b) Sampling and Monitoring Plan
-Description of monitor wells
-Description of sampling methodology, equipment and decontamination procedures
-Identify all quality assurance samples, e.g. trip blanks, equipment blanks,
duplicate samples
c) Data Interpretation
-Interpretation of groundwater levels, gradients, and flow directions.
Interpretations will include a discussion on: 1) A current site groundwater
contour map, 2) hydrographs to show groundwater elevation in each
monitor well over time, 3) depth to groundwater measured and
groundwater elevation from each monitor well summarized in a data table,
that includes historic groundwater level data for each well, and 4) an
evaluation of the effectiveness of hydraulic capture of all contaminants of
concern.
-Interpretation of all analytical results for each well, including a discussion
on: 1) a current chloroform isoconcentration map with one of the
isoconcentration lines showing the 70 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
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 2nd Quarter, 2017 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) with
the exception of compliance monitor well TW4-26.
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TW4-26 had a chloroform concentration of 244 gg/L exceeding the GWQS of 70 |ag/L. This well is
located at the southern downgradient end of the Plume. Should chloroform exceed its GWQS in TW4-
26 in the 3rd Quarter 2017 EFR will be required to follow corrective action activities in GCAP Part II.H.
Compliance well TW4-12, for the historic first time since monitoring began in the 1st quarter 2005, had
a detectible chloroform concentration of 1.25 pg/L. No action recommended other than watching how
future chloroform concentrations will trend.
Performance Monitor Wells (“PM”) IWells Exceeding Chloroform Concentrations GWQS of 70pg/L]
Nine PM wells still exceed 70pg/L for the 2nd Quarter, 2017: TW4-6, TW4-7, TW4-8, TW4-9, TW4-10,
TW4-16, TW4-26, TW4-29, and TW4-33.
Compliance Monitor Wells (“CM”) IWells with Chloroform Concentrations between 1 and 70pg/Ll
Eight CM wells range with detectable chloroform concentration but still below 70pg/L 2nd Quarter,
2017: TW4-5, TW4-12, TW4-14, TW4-16, TW4-18, TW4-24, TW4-27, and TW4-30.
CM Wells Below the Laboratory Chloroform Detection Limit (<1.0 ug/L1)
Eight CM wells in the 2nd Quarter, 2017 below the laboratory detection limit for chloroform (<1.0
pg/L): MW-32, TW4-3, TW4-13, TW4-23, TW4-28, TW4-31, TW4-32, TW4-34, TW4-35, TW4-36,
and TW4-38.
Pumping Wells
2nd Quarter, 2017 pumping wells MW-4, MW-26, TW4-1, TW4-2, TW4-4, TW4-11, TW4-19, TW4-20,
TW4-21 TW4-22,TW4-37, and TW4-39 exceed chloroform concentrations of 70pg/L. 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. TW4-38 also exceeded (10.6 mg/1) the nitrate GWQS. The source of these nitrate
exceedances appear not to be associated with the nitrate plume addressed in the NCAP. The nitrate
source for these wells may be from the same source as the chloroform plume.
TW4-10 is located within the chloroform plume 70 pg/L boundary (1260 pg/L). Both the nitrate and
chloroform concentrations at TW4-10, TW4-12, TW4-28, and TW4-38 are likely to be captured at
downgradient pumping wells MW-4, TW4-2 or TW4-11.
TW4-26 source of nitrate may now be from the chloroform plume because, as stated above, it now has
exceeded the chloroform GWQS at 244 pg/L in the 2nd quarter, 2017. Because wells TW4-29 and
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TW4-34 are approximately 500 feet down gradient of TW4-26 and have nitrate concentrations below the
GWQS of 2.26 mg/L and 0.72 mg/L respectively in the 2nd Quarter, 2017 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 it’s outside plume boundary
with a chloroform concentration of 5.6 pg/L in the 2nd Quarter, 2017. Because well TW4-31 is
approximately 200 feet down gradient of TW4-27 that has a nitrate concentration below the GWQS of
1.21 mg/L in the 2nd Quarter, 2017 at this time no action is recommended. However, should future
nitrate concentrations in TW4-31 increases to above 10 mg/L or shows an increasing trend an additional
investigation may be recommended.
Conclusions on Compliance with the Permit and QAP
Per the Division review it appears that the Report complies with Permit, QAP, and GCAP. Therefore a
letter will be drafted for the Division Director Signature, notifying EFR of the review and closing out of
for the 2nd Quarter, 2017 Chloroform Monitoring Report for the chloroform contamination investigation.
Page 7
References
EFR Quality Assurance Plan, June 7, 2012 (Revision. 7.2)
EFR issued Ground Water Quality Discharge Permit No. UGW370004. Permit version that was
signed on August 24, 2012.
EFR Groundwater Corrective Action Plan, September 14, 2015 (Revision 0)
EFR, White Mesa Uranium Mill Chloroform Monitoring Report 1st (January through March)
Quarter 2017, May 17, 2017. (DRC-2017-003685)
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)
Utah Department of Environmental Quality Division of Radiation Control Guidance for
Groundwater Split Sampling Collection at Uranium Mill Operations, August 7, 2007.
TABLE 1 (1 of 29)
Historic Summary Of Monitoring Parameters Up To The 2nd Quarter 2017
Chloroform Contamination Investigation
DUSA White Mesa Mill
Well Parameter
Sampling Event (GWQS)
Carbon Tetrachloride Chloroform Chloromethane Methylene Chloride Chloride Nitrate, Nitrate + Nitrite
(5 pg/L)(70 pg/L)(30 pg/L)(5 pg/L)No GWQS (mq/L) (10 mq/L)
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 60
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 64
1st Qtr 2/28/07 1.6 2,300 <10 <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 6.2
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
list Qtr 2/17/16 1.2 1,600 <1.0 <1.0 45 4.0
2nd Qtr 6/14/10 1.2 2,100 <1.0 <1.0 41 5.1
3rd Qtr 8/6/10 1.5 1,900 <1.0 <1.0 38 4.8
4th Qtr 10/15/10 1.4 1,500 <1.0 <1.0 41 4.9
1st Qtr 2/23/11 1.5 1,700 <1.0 <1.0 40 4.6
2nd Qtr 6/1/11 1.4 1,700 <1.0 <1.0 35 4.9
3rd Qtr 8/17/11 1.1 1,700 <1.0 <1.0 41 4.9
4th Qtr 11/16/11 1.3 1,600 <1.0 <1.0 40 5.1
(1)1st Qtr 1/23/12 1 1,500 <1.0 <1.6 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 <1.6 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 41.4 489
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 <1.0 399 4.08
3rd Qtr 8/11/14 7.6 1,490 <1.0 <1.0 41.0 3.7
4th Qtr 10/21/14 <1.0 1,440 <1.0 <1.0 41.5 5.07
1st Qtr 3/9/15 1.26 1,400 <1.0 <1.0 40.7 5.75
2nd Qtr 6/8/15 <1.0 1,300 <1.0 <1.0 43.1 2.53
3rd Qtr 8/31/15 <1.0 1,200 1.42 <1.0 44.3 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 <1.6 42.2 5.15
2nd Qtr 5/23/16 1.44 1,580 <1.0 <1.0 43.7 4.54
3rd Qtr 7/25/16 <1.0 1,430 <1.0 <1.0 42.5 4.95
4th Qtr 10/12/16 1.24 1,470 <1.0 <1.0 44.8 488
1st Qtr 3/8/17 1.22 1,450 <1.0 <1.0 43.3 4.99
2nd Qtr 6/13/17 1.15 1,430 <1.0 <1.0 44.0 4.88
MW-4A(TW4-A)
1st Qtr 3/16/05 NA 3,700 NA NA NA 7.1
2nd Qtr 5/25/05 NA 3,740 NA NA NA 7.8
3rd Qtr 8/31/05 <10 3,800 <10 <10 NA 6.9
4th Qtr 12/7/05 <50 3,000 <50 <50 55 6.7
1st Qtr 3/9/06 <50 3,700 <50 <50 53 5.8
2nd Qtr 6/14/06 <50 3,300 <50 <50 54 7.3
3rd Qtr 7/20/05 <50 3,190 <50 <50
54 1.2
4th Qtr 11/8/05 2.4 3,370 <1.0 <1.0 54 7.1
1st Qtr 2/28/07 1.9 2,500 <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 29)
Historic Summary Of Monitoring Parameters Up To The 1st Quarter 2017
Chloroform Contamination Investigation
DUSA White Mesa Mill
Well
Sampling Event
Parameter
(GWQS)
Carbon Tetrachloride
_______(5 H9'L)_______
Chloroform
(70 H9'L)
Chloromethane
____ (30pg/L)
Methylene Chloride
(5 pg/L)
Chloride
No GWQS (mq/L)
Nitrate, Nitrate + Nitrite
(10 mq/L)
MW-26 (former TW4-15)
Chloroform pumping well started
8/8/03
1st Qtr 3/16/05 NA 310 NA NA NA 0.3
2nd Qtr 5/25/05 NA 442 NA NA NA 0.2
3rd Qtr 8/31/05 <5.0 960 5.4 <5.0 NA 0.2
4th Qtr 12/7/05 <50 1,000 <50 <50 55 0.3
1st Qtr 3/9/06 <50 1,100 <50 <50 52 0.2
2nd Qtr 6/14/06 <50 830 <50 <50 52 0.2
3rd Qtr 7/20/06 <50 2,170 <50 <50 65 1.4
4th Qtr 11/8/06 <1.0 282 <1.0 2.6 54 0.3
1st Qtr 2/28/07 <1.0 570 <1.0 5.5 56 0.6
2nd Qtr 6/27/07 <1.0 300 <1.0 13 49 0.4
3rd Qtr 8/15/07 <1.0 1,400 <1.0 36 57 1
4th Qtr 10/10/07 <1.0 2,000 <1.0 14 57 0.6
1st Qtr 3/28/08 <1.0 930 <1.0 40 49 6.1
2nd Qtr 6/25/08 <1.0 1,300 <1.0 53 57 0.6
3rd Qtr 9/10/08 <1.0 630 <1.0 24 44 0.2
4th Qtr 10/15/08 NA NA NA NA 64 0.1
11/18/08 <2.0 1,700 <2.0 100 NA NA
1st Qtr 3/4/09 <1.0 950 <1.0 51 49 0.4
2nd Qtr 6/23/09 <1.0 410 <1.0 12 48 0.2
3rd Qtr 9/14/09 <1.0 850 <1.0 30 46 0.1
4th Qtr 12/14/09 <1.0 1,100 <1.0 40 60 2.3
1st Qtr 2/17/10 <1.0 730 <1.0 19 57 0.2
2nd Qtr 6/14/10 1.2 1,600 <1.0 <1.0 40 6.8
3rd Qtr 8/16/10 <1.0 2,200 <1.0 21 49 0.6
4th Qtr 10/15/10 <1.0 970 <10 6.5 65 0.7
1st Qtr 2/23/11 <1.0 450 <1.0 3.6 57 0.5
2nd Qtr 5/31/11 <1.0 1,800 <1.0 1.3 88 0.4
3rd Qtr 8/17/11 <1.0 720 <1.0 7.2 58 0.9
4th Qtr 11/16/11 NA NA NA NA 69 2.0
'’’l 2/5/11 <1.0 1,800 <1.0 2.9 NA NA
(2)1st Qtr 2/7/12 <1.0 2,400 <1.0 16 98 1.7
2nd Qtr 6/6/12 <1.0 3,000 <1.0 21 73 2.5
3rd Qtr 9/4/12 <1 3,100 <1 31 73 2.6
4th Qtr 10/4/12 <1 1,200 <1 4 68 1.8
1st Qtr 2/11/13 <1 2,120 <1 9.34 81.9 2.27
2nd Qtr 6/5/13 <1.0 4,030 <1.0 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 JL410 <1 4 03 72 3 1.38
1st Qtr 1/27/14 <1.0 1,400 <1.0 13.8 594 0.55
2nd Qtr 5/19/14 <1.0 1,960 <1.0 15.4 53.4 0.93
3rd Qtr 8/11 /14 <1.0 2,120 8.7 26 59 0.7
4th Qtr 10/21/14 <10 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’ist Qtr 3/9/16 <1.0 2,650 <10 4.66 683 1.45
2nd Qtr 5/23/16 <1.0 2,220 <10 4.57 66.2 1.12
3rd Qtr 7/25/16 <1.0 3,190 <1.0 7.81 66.4 1.57
4th Qtr 10/12/16 <1.0 2,510 <1.0 4.31 66.2 1.18
1st Qtr 3/8/17 <i.d 1,290 <1.0 7.65 58.4 0.768
2nd Qtr 6/13/17 <1.0 2,450 <1.0 7.59 64.3 0.922
(1) VOCs were resampled because laboratory missed holding time.
(2) As of March 2012 both north and south wild life ponds no longer receiving water
NA = not analyzed
Shaded indicates concentrations exceeding GWQS.
Bold and italics indicates the MDL exceeded the GWQS.
TABLE 1 (3 of 29)
Historic Summary Of Monitoring Parameters Up To The 1st Quarter 2017
Chloroform Contamination Investigation
DUSA White Mesa Mill
Well
Sampling Event
Parameter
(GWQS)
Carbon Tetrachloride Chloroform Chloromethane Methylene Chloride Chloride Nitrate, Nitrate + Nitrite
(5 pg/L) (70 pg/L)(30 pg/L)(5 pg/L)No GWQS (mg/L)(10 mg/L)
MW-32 llormef TV/4-17)
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 <10 <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 <i
2nd Qtr 6/23/09 <1.0 <1.0 <1.0 <1.0 31 <0.1
3rd Qtr 9/14/09 <1.0 <1.0 <1.0 <1.0 33 <0.1
4th Qtr 12/16/09 <1.0 <1.0 <1.0 <1.0 35 <0.1
1st Qtr 2/17/10 <1.0 <1.0 <1.0
<1.6 38 <6.1
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 <10 <1.0 31 <0.1
3rd Qtr 8/16/11 <1.0 <1.0 <10 <1.0 33 <0.1
4th Qtr 11/16/11 NA NA NA NA 32 <0.1
(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 <1.0 <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 <0.1
2nd Qtr 5/23/14 <1.0 <1.0 <1.0 <1.0 39.7 <0.1
3rd Qtr 8/26 /14 <1.0 <1.0 <1.0 <1.0 34 <0.1
4th Qtr 10/29/14 <1.0 <1.0 <1.0 <1.0 34.9 <0.1
1st Qtr 3/17/15 <1.0 <1.0 <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 !<i.o 37.7 <0.1
4th Qtr 10/28/15 <1.0 <1.0 <1.0 <1.0 34.7 <0.1'1st Qtr 3/22/16 <1.0 <1.0 <1.0 <1.0 36.7 <0.1
Duplicate TW4-70 <1.0 <1.0 <1.0 <1.0 37.7 0.119
2nd Qtr 6/8/16 <1.0 <1.0 <1.0 <1.0 36.4 <0.1
Duplicate TW4-70 <1.0 <1.0 <1.0 <1.0 37.7 <0.1
3rd Qtr 8/19/16 <1.0 <1.0 <1.0 <1.0 35.7 <0.1
4th Qtr 10/31/16 <1.0 <1.0 <1.0 <1.0 36.9 <0.1
1st Qtr 3/21/17 <1.0 <1.0 <1.0 <1.0 33.7 <0.1
2nd Qtr 6/21/17 <1.0 <1.0 <1.0 <1.0 37.2 <0.1
(1) VOCs were resampled because laboratory missed holding time.
(2) As of March 2012 both north and south wild life ponds no longer receiving water.
NA = not analyzed
Shaded indicates concentrations exceeding GWQS.
TABLE 1 (4 of 29)
Historic Summary Of Monitoring Parameters Up To The 1st Quarter 2017
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
(1° mg/L)
TW4-1 (chloroform pumping
well started in 1/14/15)
1st Qtr 3/16/05 NA 2,700 NA NA NA 9.1
2nd Qtr 5/25/05 NA 3,080 NA NA NA 106
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 12 1,900 <1.0 <1.0 47 8.9
2nd Qtr 6/27/07 1.4 1,900 <1.0 <1.0 45 9
3rd Qtr 8/15/07 1.3 2,300 <1.0 <1.0 43 8.4
4th Qtr 10/10/07 1.3 2,000 <1.0 <1.0 43 7.8
1st Qtr 3/28/08 1.3 2,000 <1.0 <1.6 39 7.6
2nd Qtr 6/25/08 1.1 1,900 <1.0 <1.0 39 868
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 93
1st Qtr 3/11/09 1.1 1,700 <1.0 <1.0 37 7.5
2nd Qtr 6/23/09 1 1,500 <1.0 <1.0 37 6.9
3rd Qtr 9/14/09 <1.0 1,700 <1.0 <1.0 36 7.3
4th Qtr 12/29/09 <1.0 1,400 <1.0 <1.0 41 6.8
1st Qtr 3/3/10 <10 1,300 <10 <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 <10 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 <1.0 1,300 <1.6 <1.0 38 68
2nd Qtr 6/14/12 <1.0 1,000 <1.0 <1.0 42 7.1
3rd Qtr 9/28/12 <1.0 1,000 <1.0 <1.0 39 5.0
4th Qtr 10/4/12 <1.0 1,100 <1.0 <1.0 40 6.5
1st Qtr 2/13/13 3.66 1,320 <1.0 <1.0 37.6 6.99
2nd Qtr 6/19/13 <1.0 1,100 <1.0 <1.0 39.1 6.87
3rd Qtr 9/3/13 <1.0 1,150 <1.0 <1.0 37.6 7 12
4th Qtr 11/14/13 <1.0 1,280 <1.0 <1.0 36.5 7.08
1st Qtr 2/5/14 5.47 1,090 <1.0 <1.0 38.9 7.74
2nd Qtr 5/23/14 4.77 1,020 <1.0 <1.0 37.4 6.93
3rd Qtr 8/27/14 <1.0 845 1.4 <1.0 38 4.80
4th Qtr 10/29/14 <1.0 1,140 <1.0 <1.0 38.7 6.31
(2)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 1.55
1st Qtr 3/9/16 <1.0 974 <1.0 <1.0 41.7 0.148
2nd Qtr 5/23/16 <1.0 1,140 <1.0 <1.0 44.4 0.138
3rd Qtr 7/25/16 <1.0 1,160 <1.0 <1.0 44.7 5.49
4th Qtr 10/13/16 <1.0 1,330 <1.0 <1.0 44.2 0.746
1st Qtr 3/8/17 <1.0 519 <1.0 <1.0 41.5 4.44
2nd Qtr 6/13/17 <1.0 977 <1.0 <1.0 41.8 5.74
12)s_of_March_2012_both_north_and_south_wHd_life gonds no longer receiving water
^J^chloroform^pumpinp^well started in 1/14/15___
NA = not analyzed
Shaded indicates concentrations exceeding GWQS.
Bold and italics indicates the MDL exceeded the GWQS.
TABLE 1 (5 of 29)
Historic Summary Of Monitoring Parameters Up To The 1st Quarter 2017
Chloroform Contamination Investigation
DUSA White Mesa Mill
Well
Sampling Event
Parameter
(GWQS)
Carbon Tetrachloride
(Sug/L)
Chloroform
(70 pg/L)
Chloromethane
(30 pg/L)
Methylene Chloride
(5 pg/L)
Chloride
No GWQS (mq/L)
Nitrate, Nitrate + Nitrite
(10 mg/L)
TW4-2 (chloroform pumping
well starting 1/14/15)
1 st 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 <1.0 54 73
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 6.4
1st Qtr 3/3/10 2 2,600 <1.0 <1.0 42 6.8
2nd Qtr 6/14/10 2.6 3,300 <1.0 <1.0 43 8.7
3rd Qtr 8/18/10 2.5 3,300 <1.0 <1.0 43 6.6
4th Qtr 10/15/10 2.1 3,000 <1.0 <1.0 41 6.5
1st Qtr 2/24/11 2.4 3,100 <1.0 <1.0 46 7.0
2nd Qtr 6/2/11 2.2 3,000 <1.0 <1.0 42 6.8
3rd Qtr 8/17/11 1.6 2,400 <1.0 <1.0 48 6.0
4th Qtr 11/29/11 2.8 3,900 <1.0 <1.0 49 7.0
(1)1st Qtr 1/24/12 2 2,500 <1.0 <1.0 49 7.1
2nd Qtr 6/14/12 2.1 2,500 <1.0 <1.0 52 7.7
3rd Qtr 9/28/12 1.8 2,900 <1.0 <1.0 76 4.0
4th Qtr 10/4/12 2 3,100 <1.0 <1.0 49 7.6
1st Qtr 2/13/13 5.17 3,580 <1.0 <1.0 46 8.1
2nd Qtr 6/19/13 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)1st Qtr 3/9/15 1.44 1,840 <1.0 <1.0 44.9 5.32
2nd Qtr 6/8/15 <1.0 1,650 <1.0 <1.0 48.1 4.3
3rd Qtr 8/31/15 <1.0 1,060 2.6 <1.0 50 3.76
4th Qtr 10/19/15 2.6 2,070 <1.0 <1.0 41.9 5.18
1st Qtr 3/9/16 1.2 1,970 <1.0 <1.0 43.4 5.30
2nd Qtr 5/23/16 1.49 2,070 <1.0 <1.0 43.8 5.67
3rd Qtr 7/25/16 <1.0 1,780 <1.0 <1.0 42.9 4.07
4th Qtr 10/12/16 <1.0 1,600 <1.0 <1.0 44.3 6.07
1st Qtr 3/8/17 <1.0 1,570 <1.0 <1.0 43.1 4.74
2nd Qtr 6/13/17 <1.0 1,940 <1.0 <1.0 43.6 4.90
il)J^^°£^rch^(^^othjiort^ajTd_south_wild_life ponds no longer receiving water
^2)_chloroform_pumping_well started in 1/14/15___
NA = not analyzed
Shaded indicates concentrations exceeding GWQS.
Bold and italics indicates the MDL exceeded the GWQS.
TABLE 1 (6 of 29)
Historic Summary Of Monitoring Parameters Up To The 1st Quarter 2017
Chloroform Contamination Investigation
□USA White Mesa Mill
Well
Sampling Event
Parameter
___(GWQS)___
Carbon Tetrachloride
(5 pg/L)
Chloroform
(70 pg/L)
Chloromethane
(30 pg/L)
Methylene Chloride
(5 pg/L)
Chloride
No GWQS (mg/L)
Nitrate, Nitrate + Nitrite
(10 mg/L)
TW4-3
1 st 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 <1.0 <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 28
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 <10 23 3.5
2nd Qtr 5/25/11 <1.0 <1.0 <1.0 <1.0 23 3.7
3rd Qtr 8/16/11 <1.0 <1.0 <1.0 <1.0 23 4.0
4th Qtr 11/14/11 <1.0 <1.0 <1.0 <1.0 23 4.4
(1)1st Qtr 1/17/12 <1.0 <1.0 <1.0 <1.0 21 7.1
2nd Qtr 5/31/12 <1.0 <1.0 <1.0 <1.0 24 4.4
3rd Qtr 8/29/12 <1.0 <1.0 <1.0 <1.0 25 4.9
4th Qtr 10/3/12 <1.0 <1.0 <1.0 <1.0 25 4.8
1st Qtr 2/7/13 <1.0 <1.0 <1.0 <1.6 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 <1.0 244 6 01
3rd Qtr 8/13/14 <1.0 <1.0 <1.0 <1.0 26 5.30
4th Qtr 10/23/14 <1.0 <1.0 <1.0 <1.0 26.7 6.07
1st Qtr 3/11/15 <1.0 <1.0 <1.0 <1.6 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 32.8 583
2nd Qtr 5/25/16 <1.0 <1.0 <1.0 <1.0 27.9 5.65
3rd Qtr 7/27/16 <1.0 <1.0 <1.0 <1.0 26.5 6.10
4th Qtr 10/19/16 <1.0 <1.0 <1.0 <1.0 29.5 6.00
1st Qtr 3/14/17 <1.0 <1.0 <1.0 <1.0 28.1 6.18
2nd Qtr 6/14/17 <1.0 <1.0 <1.0 <1.0 28.7 636
il)^^°l.^rch^^2J>o^o^andsouth_wiJd_life gondsno^longerreceiving water.
NA = not analyzed
Shaded indicates concentrations exceeding GWQS.
TABLE 1 (7 of 29)
Historic Summary Of Monitoring Parameters Up To The 1st Quarter 2017
Chloroform Contamination Investigation
□USA White Mesa Mill
Well
Sampling Event
Parameter
(GWQS)
Carbon Tetrachloride
(Spg/L)
Chloroform
(70 pg/L)
Chloromethane
(30 pg/L)
Methylene Chloride
(5 pg/L)
Chloride
No GWQS (mg/L)
Nitrate, Nitrate + Nitrite
(10 mg/L)
TW4-4 (chloroform pumping
well stared in 1st qtr 2010)
1st Qtr 3/16/05 NA 3,100 NA NA NA 10.0
2nd Qtr 5/25/05 NA 2,400 NA NA NA 11.3
3rd Qtr 8/31/05 <10 3,200 <10 <10 NA 9.9
4th Qtr 12/7/05 <50 2,800 <50 <50 54 10.2
1st Qtr 3/9/06 <50 2,900 <50 <50 51 9.5
2nd Qtr 6/14/06 <50 2,600 <50 <50 48 8.6
3rd Qtr 7/20/06 <50 2,850 <50 <50 50 9.7
4th Qtr 11/8/06 1.7 2,670 <1.0 <1.0 49 10.1
1st Qtr 2/28/07 1.5 2,200 <1.0 <1.0 49 9.0
2nd Qtr 6/27/07 1.7 2,400 <1.0 <1.0 47 9.4
3rd Qtr 8/15/07 1.5 2,700 <1.0 <1.0 45 9.5
4th Qtr 10/10/07 1.5 2,500 <1.0 <1.0 47 9 5
1st Qtr 3/28/08 1.6 2,800 <1.0 <1.0 43 9.2
2nd Qtr 6/25/08 1.5 2,500 <1.0 <1.0 42 10.8
3rd Qtr 9/10/08 1.4 2,200 <1.0 <1.0 39 8 8
4th Qtr 10/15/08 NA NA NA NA 44 10.1
4th Qtr 11/18/09 <2.0 2,500 <2.0 <2.0 NA NA
1st Qtr 3/4/09 1.2 2,200 <1.0 <1.6 37 10.2
2nd Qtr 6/23/09 1.2 1,800 <1.0 <1.0 34 8.2
3rd Qtr 9/14/09 1.1 2,000 <1.0 <1.0 39 8.4
4th Qtr 12/29/09 1.1 950 <1.0 <1.0 41 7.6
(2)1st Qtr 2/17/10 1 1,700 <1.0 <1.0 48 6.6
2nd Qtr 6/14/10 1.2 1,700 <1.0 <1.0 35 7.6
3rd Qtr 8/10/10 1.3 2,100 <1.0 <1.0 36 7.3
4th Qtr 10/15/10 1.3 1,700 <1.0 <1.0 38 7.1
1st Qtr 2/23/11 1.4 1,800 <1.0 <1.0 41 7.0
2nd Qtr 6/1/11 1.2 1,700 <1.0 <1.0 35 7.0
3rd Qtr 8/17/11 <1.0 1,500 <1.0 <1.0 40 6.6
4th Qtr 11/16/11 1 1,500 <1.0 <1.0 39 7.0
(1)1st Qtr 1/23/12 <1.0 1,200 <1.0 <1.6 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 7.0ist Qtr 2/11/13 1 1,460 <1.0 <1.0 39 7.36
2nd Qtr 6/29/13 <1.0 1,330 <1.0 <1.0 39.6 6.30
3rd Qtr 9/3/13 1.2 1,380 <1.0 <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 <1.0 37.6 7.7
2nd Qtr 6/10/15 <1.0 1,280 <1.0 <1.0 41.3 6.33
3rd Qtr 8/31/15 <1.0 1,220 1.72 <1.0 45.8 6.45
4th Qtr 10/19/15 <1.0 1,190 <1.0 <1.0 38.5 6.27
1st Qtr 3/9/16 <1.0 1,190 <1.0 <1.0 39.7 6.7
2nd Qtr 5/23/16 1.21 1,780 <1.0 <1.0 41.9 6.56
3rd Qtr 7/27/16 <1.0 1,380 <1.0 <1.0 40.2 7.22
4th Qtr 10/13/16 <1.0 1,430 <1.0 <1.0 40.3 6.77
1st Qtr 3/8/17 <1.0 1,290 <1.0 <1.0 41.7 6.87
2nd Qtr 6/13/17 <1.0 1,290 <1.0 <1.0 40.7 7.06
J1)_A scrfMa rch_2q22bothnorth_and_south_wild_life gonds no longer receiving water.
j2)_Chloroform gumpkj^weIl_stared in 1st_3tr2010]__
NA = not analyzed
Shaded indicates concentrations exceeding GWQS.
Bold and italics indicates the MDL exceeded the GWQS.
TABLE 1 (8 of 29)
Historic Summary Of Monitoring Parameters Up To The 1st Quarter 2017
Chloroform Contamination Investigation
DUSA White Mesa Mill
Well
Sampling Event
Parameter
(GWQS)
Carbon Tetrachloride
(5 M9'L)
Chloroform
(70 pg/L)
Chloromethane
(30 pg/L)
Methylene Chloride
(5 pg/L)
Chloride
No GWQS (mq/L)
Nitrate, Nitrate + Nitrite
(10 mq/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 60
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 <10 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 <10 <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 <10 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 <1.6 7.6 <1.6 <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 <1.0 108 <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 <1.0 436 8.03
1st Qtr 3/17/16 <1.6 11 <1.6 <1.0 44.7 10.2
2nd Qtr 5/23/16 <1.0 14 <1.0 <1.0 45.9 8.98
3rd Qtr 8/3/16 <1.0 11 <1.0 <1.0 44.6 8.49
4th Qtr 10/26/16 <1.0 9.9 <1.0 <1.0 47 8 8.32
Duplicate TW4-75 <1.0 12.0 <1.0 <1.0 49.5 8.34
1st Qtr 3/15/17 <1.0 12.6
<1.6 <1.0 44.7 8.49
2nd Qtr 6/15/17 <1.0 14.6 <1.0 <1.0 47.3 8.52
(1) VOCs were resampled because laboratory missed holding time.^2)^^o£^rch^(^^othjiorth_ajTdsouth_wiJd_life gondsnojongerrecejving water
NA = not analyzed
Shaded indicates concentrations exceeding GWQS.
TABLE 1 (9 of 29)
Historic Summary Of Monitoring Parameters Up To The 1st Quarter 2017
Chloroform Contamination Investigation
DUSA White Mesa Mill
Well
Sampling Event
Parameter
(GWQS)
Carbon Tetrachloride
(5 pg/L)
Chloroform
(70 pg/L)
Chloromethane
(30 pg/L)
Methylene Chloride
(5 pg/L)
Chloride
No GWQS (mq/L)
Nitrate, Nitrate + Nitrite
(10 mg/L)
TW4-6
1st Qtr 3/16/05 NA <1.0 NA NA NA 0.2
2nd Qtr 5/25/05 NA 2.5 NA NA NA 04
3rd Qtr 8/31/05 <1.0 10 2.8 <1.0 NA 08
4th Qtr 12/7/05 <1.0 17 1.3 <1.0 32 09
1st Qtr 3/9/06 <1.0 31 <1.0 <1.6 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 <1.0 280 <1.0 <1.0 37 5.0
4th Qtr 12/29/09 <1.0 250 <1.0 <1.0 41 6.1
(5)1 st Qtr 2/25/10 <1.0 1000 <10 <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 <10 <10 41 4.3
1st Qtr 2/23/11 <1.0 47 <1.0 <1.0 40 6.7
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
|1) 12/7/11 <1.0 21 <1.0 <1.0 NA NA
<2111/16/11 <1.0 50 <1.0 <1.0 33 0.8
(4)1st Qtr 1/18/12 <1.0 38 <1.0 <1.0 38 0.7
2nd Qtr 6/13/12 <1.0 4.7 <1.0 <1.0 40 0.2
3rd Qtr 9/11/12 <1.0 6.9 <1.0 <1.0 21 0.1
4th Qtr 10/3/12 <1.0 9 <1.0 <1.0 41 0.2
1st Qtr 2/13/13 <1.0 6.89 <1.0 <1.0 40.4 0.2
2nd Qtr 6/13/13 <1.0 4.86 <1.0 <1.0 37.9 0.2
3rd Qtr 9/5/13 <1.0 5 93 <1.0 <1.0 40.6 0.2
4th Qtr 11/13/13 <1.0 551 <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
l3,3rd 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 69
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
3rd Qtr 7/27/16 <1.0 433 <1.6 <1.0 42.2 3.85
4th Qtr 10/26/16 <1.0 301 <1.0 <1.0 46.1 3.74
1st Qtr 3/16/17 <1.0 288 <1.6 <1.6 42.1 3 15
2nd Qtr 6/21/17 <1.0 239 <1.0 <1.0 42.6 242
(1) VOCs were resampled because laboratory missed holding time
(2) Results of the TW4-70 the duplicate sample for TW4-6.
(3) Reanalyzed for VOCs only
^4)_A s_of_Ma rch_2 012 both north and_south_wi|d_[ife gondsn^longer^receiving water
^5)_Chloroform gumpin^well TW4-4 located appoximately 3stared in 1st qtr 2010)
NA = not analyzed
Shaded indicates concentrations exceeding GWQS.
TABLE 1 (10 of 29)
Historic Summary Of Monitoring Parameters Up To The 1st Quarter 2017
Chloroform Contamination Investigation
DUSA White Mesa Mill
Well
Sampling Event
Parameter
(GWQS)
Carbon Tetrachloride
(5 pg/L)
Chloroform
(70 Ufl/L)
Chloromethane
(30 pg/L)
Methylene Chloride
(5 ug/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 2,160 <1.0 <1.0 49 4.6
1st Qtr 2/28/07 1.1 1,830 <1.0 <1.0 47 6
2nd Qtr 6/27/07 1.5 2,600 <1.0 <1.0 45 5.1
3rd Qtr 8/15/07 1.4 2,300 <1.0 <1.0 44 4.7
4th Qtr 10/10/07 1.2 1,900 <1.0 <1.0 45 4.7
1st Qtr 3/28/08 1.3 2,200 <1.0 <1.0 43 4.2
2nd Qtr 6/25/08 1.3 1,800 <1.0 <1.0 43 4.8
3rd Qtr 9/10/08 1.4 1,600 <1.0 <1.0 35 4.16
4th Qtr 10/15/08 NA NA NA NA 40 4.01
11/18/08 <2.0 2,500 <2.0 <2.0 NA NA
1st Qtr 3/11/09 1.2 1,800 <1.0 <1.0 35 3.7
2nd Qtr 6/23/09 <1.0 1,400 <1.0 <1.0 37 3.8
3rd Qtr 9/14/09 1 1,500 <1.0 <1.0 37 4.1
4th Qtr 12/29/09 <1.0 1,300 <1.0 <1.0 37 4.2
1st Qtr 3/3/10 <1.0 1,200 <1.0 <1.0 35 3.8
2nd Qtr 6/14/10 <1.0 1,100 <1.0 <1.0 31 3.9
3rd Qtr 8/11/10 1 1,500 <1.0 <1.0 36 3.9
4th Qtr 10/15/10 <1.0 1,100 <1.0 <1.0 38 4
1st Qtr 2/23/11 <1.0 1,300 <1.0 <1.0 45 3.6
2nd Qtr 6/1/11 <1.0 1,200 <1.0 <1.0 35 4.0
3rd Qtr 8/18/11 <1.0 1,200 <1.0 <1.0 37 4.1
4th Qtr 11/29/11 <1.0 1,000 <1.0 <1.0 37 3.8
(1)1st Qtr 1/19/12 <1.0 1,000 <1.0 <1.0 37 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 <1.0 926 <1.0 <1.0 40.2 3.68
1st Qtr 3/18/15 <1.0 942 <1.0 <1.0 40.4 4.25
2nd Qtr 6/11/15 <1.0 950 <1.0 <1.0 42.1 2.62
3rd Qtr 9/10/15 <1.0 897 <1.0 <1.0 46.7 4.72
4th Qtr 10/29/15 <1.0 847 <1.0 <1.0 40.6 3.49
ist Qtr 3/22/16 <1.0 834 <1.0 <1.0 42.4 4.43
2nd Qtr 6/8/16 <1.0 909 <1.0 <1.0 44.1 3.75
3rd Qtr 8/4/16 <1.0 1,000 <1.0 <1.0 42.3 4.21
4th Qtr 10/26/16 <1.0 886 <1.0 <1.0 45.8 4.33
1st Qtr 3/21/17 <1.0 986 <1.0 <1.0 40.5 3.87
2nd Qtr 6/21/17 <1.0 968 <1.0 <1.0 43.3 4.15
jj) As of March 2012 bothnorth andsouth_wild_life ponds_no_loncjer_recejving water.
NA = not analyzed
Shaded indicates concentrations exceeding GWQS.
Bold and italics indicates the MDL exceeded the GWQS.
TABLE 1 (11 of 29)
Historic Summary Of Monitoring Parameters Up To The 1st Quarter 2017
Chloroform Contamination Investigation
DUSA White Mesa Mill
Well
Sampling Event
Parameter
(GWQS)
Carbon Tetrachloride
(5 pg/L)
Chloroform
(70 pg/L)
Chloromethane
(30 pg/L)
Methylene Chloride
(5 pg/L)
Chloride
No GWQS (mq/L)
Nitrate, Nitrate + Nitrite
(10 mg/L)
TW4-8
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 <1.0 39 0.3
2nd Qtr 6/14/06 <1.0 1.8 1.0 <1.0 37 <1.0
3rd Qtr 7/20/06 <1.0 <1.0 <1.0 <1.0 39 0.1
4th Qtr 11/8/06 <1.0 <1.0 <1.0 <1.0 40 <.1
1st Qtr 2/28/07 <1.0 2.5 <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 <1.0 46 0.1
2nd Qtr 6/25/08 <1.0 <1.0 <1.0 <1.0 45 <1.0
3rd Qtr 9/10/08 <1.0 <10 <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 <6.1
2nd Qtr 6/14/10 <1.0 <1.0 <1.0 <1.0 42 <0.1
3rd Qtr 8/18/10 <1.0 <1.0 <1.0 <1.0 45 <0.1
4th Qtr 10/15/10 <1.0 <1.0 <1.0 <1.0 46 0.1
1st Qtr 2/16/11 <1.0 <1.0 <1.0 <1.0 52 <0.1
2nd Qtr 5/25/11 <1.0 <1.0 <1.0 <1.0 45 0.1
3rd Qtr 8/16/11 <1.0 <1.0 <1.0 <1.0 46 0.1
4th Qtr 11/16/11 45 0.2
|1,12/7/11 <1.0 <1.0 <1.0 <1.0 NA NA
(3)1st Qtr 1/18/12 <1.0 <1.0 <1.0 <1.6 45 6.3
2nd Qtr 5/13/12 <1.0 <1.0 <1.0 <1.0 44 0 2
3rd Qtr 8/29/12 <1.0 <1.0 <1.0 <1.0 48 0.1
4th Qtr 10/3/12 <1.0 <1.0 <1.0 <1.0 47 <0.1
1st Qtr 2/7/13 <1.0 <1.0 <1.0 <1.0 46.6 6.41
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 <1.0 981 <1.0 <1.0 53 1 88
3rd Qtr 9/10/15 <1.0 747 <1.0 <1.0 596 1.96
4th Qtr 10/29/15 <1.0 770 <1.0 <1.0 52 2.2
1st Qtr 3/17/16 <1.0 634 <1.0 <1.0 54.2 2.48
2nd Qtr 6/8/16 <1.0 595 <1.0 <1.0 58.7 2.14
3rd Qtr 8/4/16 <1.0 522 <1.0 <1.0 56.9 2.10
4th Qtr 10/27/16 <1.0 472 <1.0 <1.0 60.1 2.16
1st Qtr 3/21/17 <1.0 359 <1.0 <1.0 57.4 2.06
2nd Qtr 6/21/17 <1.0 256 <1.0 <1.0 58.8 1.97
(1) VOCs were resampled because laboratory missed holding time.
(2) Resampled to verify chloroform concentration that was collected on 1/23/14.
^3)^^on^rch^022_both_north_and_south_wild_life gondsjioJongerjreceiving water
NA = not analyzed
Shaded indicates concentrations exceeding GWQS.
TABLE 1 (12 of 29)
Historic Summary Of Monitoring Parameters Up To The 1st Quarter 2017
Chloroform Contamination Investigation
DUSA White Mesa Mill
IWell
Sampling Event
Parameter
(GWQS)
Carbon Tetrachloride Chloroform Chloromethane Methylene Chloride Chloride Nitrate, Nitrate + Nitrite
(5 pg/L) (70 pg/L) (30 pg/L)(5 pg/L) No GWQS (mq/L) (10 mq/L)
TW4-9
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 <10 <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
1st Qtr 3/4/09 <1.0 <1.0 <1.0 <1.0 30 2.5
2nd Qtr 6/23/09 <1.0 <1.0 <10 <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 <10 <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 <10 <1.0 <1.0 <1.0 34 1.8
1st Qtr 2/17/11 <1.0 <1.0 <1.0 <1.0 41 1.3
2nd Qtr 5/25/11 <1.0 <1.0 <1.0 <1.0 38 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
(1) 12/7/11 <1.0 <1.0 <1.0 <1.0 NA(2)1 St Qtr 1/18/12 <1.0 <1.0
<1.6 <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
<1.6 <1.0 <1.0 206 4.49
2nd Qtr 5/30/13 <1.0 <1.0 <1.0 <1.0 21.4 449
3rd Qtr 9/5/13 <1.0 <1.0 <1.0 <1.0 22.7 4.03
4th Qtr 11/7/13 <1.0 <1,0.................<1.0 <1.0 23.6 4.87
1st Qtr 1/29/14 <1.0
<1.6 <1.6 <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 .....1.01 <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 <1.6 <1.6 33.6 2.51
2nd Qtr 6/8/16 <1.0 76.2 <10 <1.0 35.1 2.16
3rd Qtr 8/3/16 <1.0 76.8 <1.0 <1.0 33.6 2.1ll
4th Qtr 10/26/16 <1.0 76.0 <1.0 <1.0 37.4 2.24
1st Qtr 3/17/17 <1.0 113 <1.0 <1.0 34.5 2.18
2nd Qtr 6/21/17 <1.0 113 <1.0 <1.0 35.9 1.92
(1) VOCs were resampled because laboratory missed holding time.
^2) As of_March 2012 both_north_and_south wildlife gondsji^longerreceiving water
NA = not analyzed
Shaded indicates concentrations exceeding GWQS.
TABLE 1 (13 of 29)
Historic Summary Of Monitoring Parameters Up To The 1st Quarter 2017
Chloroform Contamination Investigation
DUSA White Mesa Mill
Well
Sampling Event
Parameter
(GWQS)
Carbon Tetrachloride
(5 pg/L)
Chloroform
(70 pg/L)
Chloromethane
(30 pg/L)
Methylene Chloride
(5 pg/L)
Chloride
No GWQS (mg/L)
Nitrate, Nitrate + Nitrite
(10 mg/L)
TW4-10
1 st Qtr 3/16/05 NA 140 NA NA NA 1.6
2nd Qtr 5/25/05 NA 62 NA NA NA 08
3rd Qtr 8/31/05 <2.5 110 6.2 <2.5 NA 1.1
4th Qtr 12/7/05 <2.5 300 <25 <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 51 923
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 <10 <1.0 48 5.0
2nd Qtr 6/14/10 <1.0 220 <10 <1.0 42 1.6
3rd Qtr 8/12/10 <1.0 100 <1.0 <1.0 38 0.8
4th Qtr 10/15/10 <1.0 1,100 <1.0 <1.0 52 11.0
1st Qtr 2/23/11 <1.0 620 <1.0 <1.0 32 9.0
2nd Qtr 6/14/11 <1.0 280 <1.0 <1.0 42 3.3
3rd Qtr 8/17/11 <1.0 180 <1.0 <1.0 41 1.9
4th Qtr 11/16/11 <1.0 110 <1.0 <1.0 45 1.1
(1)1st Qtr 1/19/12 <1.0 76 <1.0
<1.6 40 0.9
2nd Qtr 6/14/12 <1.0 79 <1.0 <1.0 46 0.8
3rd Qtr 9/12/12 <1.0 130 <1.0 <1.0 44 1.0
4th Qtr 10/3/12 <1.0 140 <1.0 <1.0 45 1.6
1st Qtr 2/13/13 <1.0 154 <1.0 <1.0 49.1 1.2
2nd Qtr 6/13/13 <1.0 486 <1.0 <1.0 51.5 5.6
3rd Qtr 9/12/13 <1.0 1,126 <1.0 <1.0 67.9 13.0
4th Qtr 11/14/13 <1.0 1,380 <1.0 <1.0 70.9 16.0
1st Qtr 1/29/14 5.16 1,260 <1.0 <1.0 73 16.8
2nd Qtr 5/23/14 <1.0 1,110 <1.0 <1.0 77.3 13.9
3rd Qtr 8/27/14 <1.0 1,060 1.5 <1.0 74 9.8
4th Qtr 10/30/14 <1.0 1,220 <1.0 <1.0 75.2 13,2
1st Qtr 3/18/15 <10 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 <i b 1,430 <1.0 <1.0 84.1 17.3
2nd Qtr 6/8/16 <1.0 1,510 <1.0 <1.0 89.5 14.9
3rd Qtr 8/4/16 <1.0 1,500 <1.0 <1.0 85.3 14.9
4th Qtr 10/26/16 <1.0 1,290 <1.0 <1.0 84.4 14.8
1st Qtr 3/21/17 <1.0 1,260 <1.0 <1.0 74.6 13.0
2nd Qtr 6/21/17 <1.0 1,140 <1.0 <1.0 73.1 13.0
0)^^o£March_2012_bothnorth_and_south_wiJd]ife Qonds_noJonger_receivingwater.
NA = not analyzed
Shaded indicates concentrations exceeding GWQS.
t
TABLE 1 (14 of 29)
Historic Summary Of Monitoring Parameters Up To The 1st Quarter 2017
Chloroform Contamination Investigation
DUSA White Mesa Mill
Well
Sampling Event
Parameter
(GWQS)
Carbon Tetrachloride
(5 P9/L)
Chloroform
(70 pg/L)
Chloromethane
(30 pg/L)
Methylene Chloride
(5 pg/L)
Chloride
No GWQS (mg/L)
Nitrate, Nitrate + Nitrite
(10 mg/L)
TW4-11 (chloroform
pumping well started 1/14/15)
1st Qtr 3/16/05 NA 4,400 NA NA NA 8.7
2nd Qtr 5/25/05 NA 3,590 NA NA NA 10.3
3rd Qtr 8/31/05 <10 4,400 <10 <10 NA 9.4
4th Qtr 12/7/05 <100 4,400 <100 <100 58 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 10.0
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 <10 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 <10 1,000 <1.0 <1.0 49 7.3
2nd Qtr 6/23/09 <1.0 980 <1.0 <1.0 44 6.8
3rd Qtr 9/14/09 <1.0 1,000 <1.0 <1.0 49 7.0
4th Qtr 12/29/09 <10 860 <1.0 <1.0 46 6.6
1st Qtr 3/3/10 <1.0 820 <1.6 <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 <i.6 1,000 <10 <1.0 46 6.5
2nd Qtr 6/1/11 <1.0 930 <10 <1.0 49 7.3
3rd Qtr 8/17/11 <1.0 820 <1.0 <1.0 48 7.1
4th Qtr 11/16/11 <1.0 1500 <1.0 <1.0 46 7.1
(1)1st Qtr 1/24/12 <1.0 610 <1.6 <1.6 43 6.8
2nd Qtr 6/13/12 <1.0 660 <1.0 <1.0 52 6.7
3rd Qtr 9/13/12 <1.0 740 <1.0 <1.0 49 3.0
4th Qtr 10/3/12 <1.0 730 <1.0 <1.0 50 7.0
1st Qtr 2/13/13 3.23 867 <1.0 <1.0 47.3“6.8
2nd Qtr 6/18/13 <1.0 788 <1.0 <1.0 49.3 7.4
3rd Qtr 9/12/13 <1.0 865 <1.0 <1.0 46.6 78
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)1st Qtr 3/9/15 1.24 2,450 <1.0 <1.0 49.8 8.72
2nd Qtr 6/11/15 <1.0 2,710 <1.0 <1.0 62.2 8.48
3rd Qtr 8/31/15 <1.0 1,120 <1.0 <1.0 73.1 9.61
4th Qtr 10/29/15 <1.0 2730 <1.0 <1.0 55.3 7.5
1st Qtr 3/9/16 1.2 2.660 <1.0 <1.0 55.5 7.13
2nd Qtr 5/23/16 2.19 3,340 <1.0 <1.0 56.4 7.81
3rd Qtr 7/25/16 <1.0 3,200 <1.0 <1.0 55.3 8.83
4th Qtr 10/12/16 <1.0 3,200 <1.0 <1.0 57.2 8.92
1st Qtr 3/8/17 1.71 3,310 <1.0 <1.0 49.8 8.12
2nd Qtr 6/13/17 1.83 3,370 <1.0 <1.0 51.4 7.92
il)— L0L^ 012_bot hn orth_and_south_wild_life gonds no longer receiving water
^2)_Chlorofonm gumpmgjvell_started_2/___
NA = not analyzed
Bold and italics indicates the MDL exceeded the GWQS.
Bold and italics indicates the MDL exceeded the GWQS.
TABLE 1 (15 of 29)
Historic Summary Of Monitoring Parameters Up To The 1st Quarter 2017
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)
TW4-12
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
<1.6 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 <1.0 <1.0 <1.0 23 24
2nd Qtr 6/23/09 <1.0 <1.0 <1.0 <1.0 22 3.8
3rd Qtr 9/14/09 <1.0 <1.0 <1.0 <1.0 22 5.1
4th Qtr 12/16/09 <1.0 <1.0 <1.0 <1.0 23 3.6
1st Qtr 2/23/10 <1.0 <1.0 <1.0 <1.0 22 4.0
2nd Qtr 6/14/10 <1.0 <1.0 <1.0 <1.0 29 11.0
3rd Qtr 8/10/10 <1.0 <1.0 <1.0 <1.0 35 9.0
4th Qtr 10/15/10 <1.0 <1.0 <1.0 <1.0 31 8.0
1st Qtr 2/15/11 <1.0 <1.0 <1.0 <1.0 31 6.5
2nd Qtr 5/25/11 <1.0 <1.0 <1.0 <1.0 32 7.0
3rd Qtr 8/16/11 <1.0 <1.0 <1.0 <1.0 31 6.8
4th Qtr 11/15/11 <1.0 <1.0 <1.0 <1.0 30 8.0
(1)1st Qtr 1/17/12 <1.6 <1.6 <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 <10 36.7 12.6
2nd Qtr 5/29/13 <1.0 <1.0 <1.0 <1.0 38.6 14.2
3rd Qtr 8/29/13 <1.0 <1.0 <1.0 <1.0 41.7 174
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 <1.0 <1.0 <1.0 <1.0 50.6 192
2nd Qtr 6/10/15 <1.0 <1.0 <1.0 <1.0 56 18.8
3rd Qtr 9/2/15 <1.0 <1.0 <1.0 <1.0 60.2 16.4
4th Qtr 10/21/15 <1.0 <1.0 <1.0 <1.0 51 18.0
Deplicate TW4-65 <1.0 <1.0 <1.0 <1.0 51.3 18.0
1st Qtr 3/15/16 <1.0 <1.0 <1.0 <1.0 56.2 34.8
2nd Qtr 5/25/16 <1.0 <1.0 <1.0 <1.0 66.4 30.7
Deplicate TW4-65 <1.0 <1.0 <1.0 <1.0 67 113.0
3rd Qtr 7/27/16 <1.0 <1.0 <1.0 <1.0 67.5 37.7
4th Qtr 10/12/16 <1.0 <1.0 <1.0 <1.0 72.6 25.8
1st Qtr 3/14/17 <1.6 <1.6 <1.0 <1.0 62.6 25.9
2nd Qtr 6/14/17 <1.0 1.25 <1.0 <1.0 67.2 29.9
12)^^olMarch^^^bothnorthandsouth^wildlife gondsnojongerrecejving water
NA = not analyzed #
Shaded indicates concentrations exceeding GWQS.
TABLE 1 (16 of 29)
Historic Summary Of Monitoring Parameters Up To The 1st Quarter 2017
Chloroform Contamination Investigation
□USA White Mesa Mill
Well
Sampling Event
Parameter
(GWQS)
Carbon Tetrachloride
(5 M9/L)
Chloroform
(70 pg/L)
Chloromethane
(30 pg/L)
Methylene Chloride
(5 pg/L)
Chloride
No GWQS (mq/L)
Nitrate, Nitrate + Nitrite
(10 mg/L)
TW4-13
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 4.0
2nd Qtr 6/27/07 <1.0 <1.0 <1.0 <1.0 59 4.6
3rd Qtr 8/15/07 <1.0 <1.0 <1.0 <1.0 58 4.4
4th Qtr 10/10/07 <1.0 <1.0 <1.0 <1.0 58 4.1
1st Qtr 3/28/08 <1.0 <1.0 <1.0 <1.0 54 3.8
2nd Qtr 6/25/08 <1.0 <1.0 <1.0 <1.0 58 4.2
3rd Qtr 9/10/08 <1.0 <1.0 <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 <1.6 <1.0 <10 <1.0 60 55
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 <1.0 <1.0 59.3 6 31
2nd Qtr 5/29/13 <1.0 <1.0 <1.0 <1.0 56 6.8
3rd Qtr 8/29/13 <1.0 <1.0 <1.0 <1.0 63.5 7.16
4th Qtr 11/6/13 <1.0 <1.0 <1.0 <1.0 58.5 648
1st Qtr 1/22/14 <1.0 <1.6 <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 <1.6 <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 <i .6 <1.0 <1.0 <1.0 69.4 7.97
2nd Qtr 5/25/16 <1.0 <1.0 <1.0 <1.0 71.8 5.87
3rd Qtr 7/28/16 <1.0 <1.0 <1.0 <1.0 69.3 6.14
4th Qtr 10/19/16 <1.0 <1.0 <1.0 <1.0 70.9 6.20
1st Qtr 3/16/17 <1.0 <1.0 <1.0 <1.0 66 6.05
2nd Qtr 6/15/17 <1.0 <1.0 <1.0 <1.0 70 6.49
12)^sofMarch 2012 both north_andsouth_wlld_life gondsjiojongerreceiving water.
NA = not analyzed
Shaded indicates concentrations exceeding GWQS.
TABLE 1 (17 of 29)
Historic Summary Of Monitoring Parameters Up To The 1st Quarter 2017
Chloroform Contamination Investigation
DUSA White Mesa Mill
Well
Sampling Event
Parameter
(GWQS)
Carbon Tetrachloride
(5 pg/L)
Chloroform
(70 pg/L)
Chloromethane
(30 pg/L)
Methylene Chloride
(5 pg/L)
Chloride
No GWQS (mq/L)
Nitrate, Nitrate + Nitrite
(10 mq/L)
TW4-14
1st Qtr 3/16/05 NS NS NS NS NS NS
2nd Qtr 5/25/05 NS NS NS NS NS NS
3rd Qtr 8/31/05 NS NS NS NS NS NS
4th Qtr 12/7/05 NS NS NS NS NS NS
1st Qtr 3/9/06 NS NS NS NS NS NS
2nd Qtr 6/14/06 NS NS NS NS NS NS
3rd Qtr 7/20/06 NS NS NS NS NS NS
4th Qtr 11/8/06 <1.0 NS <1.0 <1.0 37 2.4
1st Qtr 2/28/07 <1.0 <1.0 <1.0 <1.0 38 2.3
2nd Qtr 6/27/07 <1.0 <1.0 <1.0 <1.0 38 1.4
3rd Qtr 8/15/07 <1.0 <1.0 <1.0 <1.0 36 1.1
4th Qtr 10/10/07 <1.0 <1.0 <1.0 <1.0 38 0.8
1st Qtr 3/28/08 <1.0 <1.0 <1.0
<1.6 57 0.4
2nd Qtr 6/25/08 <1.0 <1.0 <1.0 <1.0 35 1.6
3rd Qtr 9/10/08 <1.0 <1.0 <1.0 <1.0 34 1.38
4th Qtr 10/15/08 <1.0 <1.0 <1.0 <1.0 40 0.76
1st Qtr 3/4/09 <1.0 <1.0 <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 <i.6 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 <1.6 <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 <1.6 <1.0 <1.0 35.2 4.6
2nd Qtr 5/29/13 <1.0 <1.0 <1.0 <1.0 38.6 4.4
3rd Qtr 8/29/13 <1.0 <1.0 <1.0 <1.0 37.6 4.51
4th Qtr 11/6/13 <1.0 <1.0 <1.0 <1.0 36.5 4.81
1st Qtr 1/22/14 <1.0 <1.0 <1.0 <1.0 35.5 5.92
2nd Qtr 5/21/14 <1.0 <1.0 <1.0 <1.0 32.5 4.87
3rd Qtr 8/13/14 <1.0 <1.0 <1.0 <1.0 38 4.1
4th Qtr 10/23/14 <1.0 <1.0 <1.0 <1.0 38.9 5.22
1st Qtr 3/12/15 <1.0 1.7 <1.0 <1.6 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
3rd Qtr 8/3/16 <1.0 5 <1.0 1.8 42.4 2.88
4th Qtr 10/20/16 <1.0 7.02 <1.0 1.59 45.6 2.86
1st Qtr 3/15/17 <1.0 6.45 <1.0 2.18 45.4 4.36
2nd Qtr 6/15/17 <1.0 6.85 <1.0 <1.0 46.9 5.12
) As_of_Warch_2022_bothnQrth_and_south_wild_[ife p2nds_no_loriger_receiving water.
NS = not sampled
Shaded indicates concentrations exceeding GWQS.
TABLE 1 (18 of 29)
Historic Summary Of Monitoring Parameters Up To The 1st Quarter 2017
Chloroform Contamination Investigation
DUSA White Mesa Mill
Well
Sampling Event
Parameter
(GWQS)
Carbon Tetrachloride
(5 pg/L)
Chloroform
(70 pg/L)
Chloromethane
(30 pg/L)
Methylene Chloride
(5 pg/L)
Chloride
No GWQS (mq/L)
Nitrate, Nitrate + Nitrite
(10 mg/L)
TW4-16
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 <10 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 ii <1.0 26 52 <0.1
2nd Qtr 6/25/08 <1.0 <1.0 <1.0 <1.0 58 1.5
3rd Qtr 9/10/08 <1.0 10 <1.0 14 71 10.5
4th Qtr 10/15/08 <1.0 3.9 <1.0 6.6 89 9.8
1st Qtr 3/4/09 <1.0 <1.0 <1.0 <1.0 73 9.6
2nd Qtr 6/23/09 <1.0 <1.0 <1.0 <1.0 76 8.9
3rd Qtr 9/14/09 <1.0 <1.0 <1.0 <1.0 79 88
4th Qtr 12/17/09 <1.0 <1.0 <1.0 <1.0 76 5.2
1st Qtr 2/24/10 <1.0 <1.0 <1.0 <1.0 77 4.2
2nd Qtr 6/14/10 <1.0 2.1 <1.0 <10 64 4.7
3rd Qtr 8/24/10 <1.0 4.3 <1.0 <1.0 72 4.6
4th Qtr 10/15/10 <1.0 3 <1.0 <1.0 71 3.3
1st Qtr 2/22/11 <1.0 15 <1.0 <1.0 86 7
2nd Qtr 5/26/11 <1.0 16 <1.0 <1.0 81 5
3rd Qtr 8/17/11 <1.0 9.2 <1.0 <1.0 63 1.7
4th Qtr 11/16/11 NA NA NA NA 38 0.4
(1> 12/7/11 <1.0 <1.0 <1.0 1.4 NA
(3)1st Qtr 1/18/12 <1.0 <1.0 <1.0 1.7 48 0.1
2nd Qtr 5/26/12 <1.0 <1.0 <1.0 <1.0 53 <0.1
3rd Qtr 8/30/12 <1.0 <1.0 <1.0 <1.0 59 <0.1
4th Qtr 10/3/12 <1.0 <1.0 <1.0 <1.0 59 <0.1
1st Qtr 2/7/13 <1.0 <1.0 <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
3rd Qtr 8/3/16 <1.0 49 <1.0 <1.0 60 2.20
4th Qtr 10/26/16 <1.0 92.9 <1.0 <1.0 66.7 2.78
1st Qtr 3/16/17 <1.0 19.1 <1.0 <1.0 62.2 2.75
2nd Qtr 6/20/17 <1.0 94.3 <10 <1.0 60.6 1.81
Duplicate TW4-75 <1.0 68.7 <1.0 <1.0 60.4 1.90
(1) VOCs were resampled because laboratory missed holding time.
(2) VOCs were resampled
(3) As of March 2012 both north and south wild life ponds no longer receiving water.
NA = not analyzed
Shaded indicates concentrations exceeding GWQS.
TABLE 1 (19 of 29)
Historic Summary Of Monitoring Parameters Up To The 1st Quarter 2017
Chloroform Contamination Investigation
DUSA White Mesa Mill
Well
Sampling Event
Parameter
(GWQS)
Carbon Tetrachloride Chloroform Chloromethane Methylene Chloride Chloride Nitrate, Nitrate + Nitrite
(5 pg/L)(70 pg/L) (30 pg/L)(5 pg/L)No GWQS (mg/L)(10 mg/L)
TW4-18
1 st 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 89 <1.0 <1.0 32 5.0
4th Qtr 10/10/07 <1.0 7.4 <1.0 <1.0 27 4.4
1st Qtr 3/28/08 <1.0 6.4 <1.0 <1.0 23 0.7
2nd Qtr 6/25/08 <1.0 5.7 <1.0 <1.0 23 4.6
3rd Qtr 9/10/08 <1.0 8 <1.0 <1.0 26 4.9
4th Qtr 10/15/08 <1.0 9.4 <1.0 <1.0 30 5.2
1st Qtr 3/4/09 <1.0 11 <1.0 <1.0 29 5.2
2nd Qtr 6/23/09 <1.0 16 <1.0 <1.0 30 6.2
3rd Qtr 9/14/09 <1.0 13 <1.0 <1.0 26 5.9
4th Qtr 12/22/09 <1.0 8 2 <1.0 <1.0 30 5.4
1st Qtr 2/24/10 <1.0 69 <1.0 <1.0 41 5.1
2nd Qtr 6/14/10 <1.0 29 <1.0 <1.0 35 9.0
3rd Qtr 8/12/10 <1.0 29 <1.0 <1.0 37 9.0
4th Qtr 10/15/10 <1.0 30 <1.0 <1.0 50 10.0
1st Qtr 2/22/11 <1.0 39 <1.0 <1.0 52 10.0
2nd Qtr 5/26/11 <1.0 26 <1.0 <1.0 36 9.0
3rd Qtr 8/17/11 <1.0 29 <1.0 <1.0 23 4.6
4th Qtr 11/16/11 NA NA NA NA 23 6.3
(1) 12/7/11 <1.0 28 <1.0 <1.0 NA NA
(2)1st Qtr 1/18/12 <1.0 25 <1.0 <1.0 18 4.4
2nd Qtr 6/13/12 <1.0 24 <1.0 <1.0 30 6.6
3rd Qtr 9/11/12 <1.0 38 <1.0 <1.0 26 6.6
4th Qtr 10/3/12 <1.0 30 <1.0 <1.0 27 6.0
1st Qtr 2/13/13 <1.0 34.9 <1.0 <1.0 23.1 5.6
2nd Qtr 6/13/13 <1.0 37.9 <1.0 <1.0 22.9 8.9
3rd Qtr 9/5/13 <1.0 41 <1.0 <1.0 36.2 12.1
4th Qtr 11/13/13 <1.0 44.3 <1.0 <1.0 37.1 .... .1.4,2
1st Qtr 1/30/14 <1.0 6.93 <1.0 <1.0 38.9 12.8
2nd Qtr 5/22/14 <1.0 6.93 <1.0 <1.0 47 12.2
3rd Qtr 8/14/14 <1.0 32.8 <1.0 <1.0 49 98
4th Qtr 10/28/14 <1.0 33 <1.0 <1.0 40.8 11.1
1st Qtr 3/12/15 <1.0 32 <1.0 <1.0 41.6 11.7
2nd Qtr 6/11/15 <1.0 30.5 <1.0 <1.0 43.5 9.69
3rd Qtr 9/3/15 <1.0 28.7 <1.0 <1.0 47.6 15.7
4th Qtr 10/28/15 <1.0 52.9 <1.0 <1.0 39.4 6.24
1st Qtr 3/17/16 <1.0 56.6 <1.0 <1.0 40.7 5.96
2nd Qtr 6/8/16 <1.0 60 <1.0 <1.0 43.8 5.45
3rd Qtr 8/3/16 <1.0 56.3 <1.0 <1.0 40.7 5.79
4th Qtr 10/26/16 <1.0 60.1 <1.0 <1.0 43.9 5.24
1st Qtr 3/16/17 <10 62 <1.0 <1.0 39.4 4.47
Duplicate TW4-75 <1.0 61.5 <1.0 <1.0 41.1 4.41
2nd Qtr 6/20/17 <1.0 63.8 <1.0 <1.0 41.6 4.5
(1) VOCs were resampled because laboratory missed holding time.
(2) As of March 2012 both north and south wild life ponds no longer receiving water.
NA = not analyzed
Shaded indicates concentrations exceeding GWQS.
TABLE 1 (20 of 29)
Historic Summary Of Monitoring Parameters Up To The 1st Quarter 2017
Chloroform Contamination Investigation
DUSA White Mesa Mill
Well
Sampling Event
Parameter
(GWQS)
Carbon Tetrachloride
(5 Ud/L)
Chloroform
(70 pq/L)
Chloromethane
(30 pg/L)
Methylene Chloride
(5 pg/L)
Chloride
No GWQS (mq/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 13 1,200 <1.0 <1.0 133 4
2nd Qtr 6/27/07 Did not sample
3rd Qtr 8/15/07 1.9 1,100 <1.0 <1.0 129 4.1
4th Qtr 10/10/07 1.9 1,100 <1.0 <1.0 132 4
1st Qtr 3/28/08 2.9 1,800 <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 35.2
4th Qtr 10/15/08 12 4,200 <1.0 <1.0 124 47.8
1st Qtr 3/4/09 1.2 1,100 <1.0 <1.0 127 3.2
2nd Qtr 6/23/09 1.2 990 <1.0 <1.0 132 2.4
3rd Qtr 9/14/09 15 6,600 <1.0 <1.0 43 <0.1
4th Qtr 12/22/09 16 4,700 <1.0 <1.0 124 26.7
1st Qtr 2/17/10 1.3 940 <1.0 <1.0 144 2
2nd Qtr 6/14/10 4.2 1,800 <1.0 <1.0 132 4.4
3rd Qtr 8/16/10 4.9 2,000 <1.0 <1.0 142 5.9
4th Qtr 10/15/10 1.3 1,200 <1.0 <1.0 146 2.7
1st Qtr 2/17/11 17 3,400 <1.0 <1.0 135 17.0
2nd Qtr 6/7/11 8.3 4,000 <1.0 <1.0 148 12.0
3rd Qtr 8/17/11 2.1 970 <1.0 <1.0 148 3.0
4th Qtr 11/17/11 148 5.0
(1> 12/5/11 5.4 2,200 <1.0 <1.0
(2) 1st Qtr 1/23/12 1.5 650 <1.0 <1.0 138 0.6
2nd Qtr 6/6/12 1.1 460 <1.0 <1.0 149 2.4
3rd Qtr 9/4/12 3.5 950 <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 6.42 942 <1.0 <1.0 134 4.7
1st Qtr 1/27/14 4.05 586 <1.0 <1.0 134 1.6
2nd Qtr 5/19/14 5.51 810 <1.0 <1.0 152 1.3
3rd Qtr 8/11/14 1.9 1,410 8.3 <1.0 140 1.6
4th Qtr 10/21/14 4.8 4,310 <1.0 <1.0 130 4.7
1st Qtr 3/9/15 8.92 4,660 <1.0 <1.0 238 8.56
2nd Qtr 6/8/15 262 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 10.6
1st Qtr 3/9/16 13.5 7,780 1.4 <1.0 276 15.70
2nd Qtr 5/26/16 23.1 12,600 <1.0 <1.0 204 1.27
3rd Qtr 7/25/16 9.89 6,040 <1.0 <1.0 214 10.5
4th Qtr 10/13/16 10.8 6,640 <1.0 <1.0 200 10.0
1st Qtr 3/8/17 3.06 1,240 <1.0 <1.0 461 11.1
2nd Qtr 6/13/17 1.35 510 <1.0 <1.0 135 0.243
(1) VOCs were resampled because laboratory missed holding time.
(2) As of March 2012 both north and south wild life ponds no longer receiving water.
NA = not analyzed
Bold and italics indicates the MDL exceeded the GWQS.
Shaded indicates concentrations exceeding GWQS.
TABLE 1 (21 of 29)
Historic Summary Of Monitoring Parameters Up To The 1st Quarter 2017
Chloroform Contamination Investigation
DUSA White Mesa Mill
Well
Sampling Event
Parameter
(GWQS)
Carbon Tetrachloride
_______(5 M9'L)_______
Chloroform
(70 M9'L)
Chloromethane
(30 MS'L)
Methylene Chloride
(5 pg/L)
Chloride
No GWQS (mq/L)
Nitrate, Nitrate + Nitrite
(10 mq/L)
TW4-20 (chloroform
pumping well started 8/4/05)
1 st Qtr 3/16/05 Monitor well was not installed
2nd Qtr 5/25/05 NA 39,000 NA NA NA 10.10
(3)3rd Qtr 8/31/05 <10 3,800 <10 <10 NA 2.90
4th Qtr 12/7/05 <250 19,000 <250 <250 131 1.80
1st Qtr 3/9/06 <500 9,200 <500 <500 120 3.80
2nd Qtr 6/14/06 <500 61,000 <500 <500 235 9.40
3rd Qtr 7/20/06 <1000 5,300 <1000 <1000 134 2.90
4th Qtr 11/8/06 7.1 11,000 1.9 2.2 124 3.50
1st Qtr 2/28/07 3.1 4,400 <1.0 1.1 124 4.20
2nd Qtr 6/27/07 2.2 1,800 <1.0 <1.0 112 2.30
3rd Qtr 8/15/07 3.5 5,200 <1.0 1.8 117 2.10
4th Qtr 10/10/07 6.8 9,000 <1.0 1.9 170 5.60
1st Qtr 3/28/08 9 13,000 <1.0 1.5 132 0.90
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 11 18,000 <1.0 3.7 200 5.60
3rd Qtr 8/16/10 12 15,000 <1.0 2.2 196 5.30
4th Qtr 10/15/10 20 24,000 <1.0 5.5 203 4.60
1st Qtr 2/23/11 27 31,000 <1.6 19.0 220 4.40
2nd Qtr 6/1/11 10 8,100 <1.0 2.1 177 4.80
3rd Qtr 8/17/11 7.3 3,800 <1.0 3.1 207 6.50
4th Qtr 11/16/11 7.2 7,900 <1.0 2.5 186 4.20
(2)1st Qtr 1/23/12 10 11000 <1.0 1.3 207 7.90
2nd Qtr 6/6/12 33 36,000 <1.0 <1.0 262 11.00
3rd Qtr 9/4/12 26 13,000 <1.0 <1.0 289 10.80
4th Qtr 10/3/12 22 19,000 <1.0 <1.0 302 11.00
1st Qtr 2/11/13 19.6 18,500 <1.0 1.21 252 9.07
2nd Qtr 6/5/13 32.5 26,300 <1.0 1.3 250 9.80
3rd Qtr 9/3/13 25.7 26,800 <1.0 2.14 260 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 40.6 33,700 <1.0 <1.0 318 11.2
3rd Qtr 7/25/16 26.6 ___23,600 <1.0 <1.0 307 11.3
4th Qtr 10/12/16 24.4 21,300 <1.0 <1.0 301 11.4
1st Qtr 3/8/17 23.5 23,400 <1.0 <1.0 290 12.0
2nd Qtr 6/13/17 23.4 18,100 <1.0 <1.0 281 9.76
)_VO Cs wereresample d_becau se Ja bo rat oryjri is^s edJi old jng_t i me.
(2) As of March 2012 both north and south wild life ponds no longer receiving water,
^^hloroform gumpmg^well started 8/4/05.
NA = not analyzed
Bold and italics indicates the MDL exceeded the GWQS.
Shaded indicates concentrations exceeding GWQS.
TABLE 1 (22 of 29)
Historic Summary Of Monitoring Parameters Up To The 1st Quarter 2017
Chloroform Contamination Investigation
DUSA White Mesa Mill
Well
Sampling Event
Parameter
(GWQS)
Carbon Tetrachloride
_______(5 H9'L)
Chloroform
(70 H9'L)
Chloromethane
(30 H9'L)
Methylene Chloride
(5 M9/L)
Chloride
No GWQS (mq/L)
Nitrate, Nitrate + Nitrite
(lOmg/L)
pumping well 6/9/15)
1 St Qtr 3/16/05 Monitor well was not installed
2nd Qtr 5/25/05 NA 192 NA NA NA 14.6
3rd Qtr 8/31/05 <5.0 78 <5.0 <5.0 NA 10.1
4th Qtr 12/7/05 <1.0 86 <1.0 <1.0 353 96
1st Qtr 3/9/06 <2.5 120 <25 <2 5 347 8.5
2nd Qtr 6/14/06 <2.5 120 <25 <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 <10 140 <1.0 <1.0 300 8.6
4th Qtr 10/10/07 <1.0 120 <1.0 <1.0 288 8.3
1st Qtr 3/28/08 7 390 <1.0 <1.6 331 14.3
2nd Qtr 6/25/08 1.7 180 <1.0 <1.0 271 8.8
3rd Qtr 9/10/08 1.6 120 <1.0 <1.0 244 7.57
4th Qtr 10/15/08 NA NA NA NA 284 8.0
11/18/08 2 170 <2.0 <2.0 NA NA
1st Qtr 3/11/09 <1.0 180 <1.0 <1.6 279 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 <1.0 228 8.4
2nd Qtr 614/10 <1.0 210 <1.0 <1.0 266 12 0
3rd Qtr 8/13/10 9.2 390 <1.0 <1.0 278 14 0
4th Qtr 10/15/10 1.2 200 <1.0 <1.0 210 7.0
1st Qtr 2/22/11 1.2 230 <1.0 <1.0 303 9.0
2nd Qtr 6/28/11 4.8 290 <1.0 <1.0 290 12.0
3rd Qtr 8/17/11 6.3 460 <1.0 <1.0 287 14.0
4th Qtr 11/16/11 287 13.0
|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 14.0
1st Qtr 2/13/13 5.25 282 <1.0 <1.0 221 11.8
2nd Qtr 6/18/13 3.49 328 <1.0 <1.0 243 13.8
3rd Qtr 9/13/13 2.13 244 <1.0 <1.0 207 10.3
4th Qtr 11/13/13 <1.0 204 <1.0 <1.0 206 9.0
1st Qtr 2/5/14 6.23 220 <i.6 2.04 200 114
2nd Qtr 5/22/14 4.73 240 <1.0 2.04 243 11.5
3rd Qtr 8/27/14 <1.0 204 <1.0 <1.0 230 7.1
4th Qtr 10/29/14 1.04 229 <1.0 <1.0 252 10.0
1st Qtr 3/12/15 1.75 292 <1.0 <1.0 255 10.9
(3)2nd Qtr 6/8/15 1.92 366 <1.0 <1.0 494 13.1
3rd Qtr 8/31/15 <1.0 281 <1.0 <1.0 499 14.7
4th Qtr 10/19/15 <1.0 ..................339 <1.0 <1.0 413 14.3
1st Qtr 3/9/16 <1.0 390 <1.0 <1.0 452 14.6
2nd Qtr 5/23/16 <1.0 545 <1.0 <1.0 425 13.1
3rd Qtr 7/25/16 <1.0 456 <1.0 <1.0 457 16.5
4th Qtr 10/12/16 <1.0 456 <1.0 <1.0 439 13.5
1st Qtr 3/8/17 2.36 598 <1.0 <1.0 452 17.7
2nd Qtr 6/13/17 1.16 224 <1.0 <1.0 309 __________________________________^3
(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 gumpm^well started 6/9/15
NA = not analyzed
Shaded indicates concentrations exceeding GWQS.
TABLE 1 (23 of 29)
Historic Summary Of Monitoring Parameters Up To The 1st Quarter 2017
Chloroform Contamination Investigation
DUSA White Mesa Mill
Well
Sampling Event
Parameter
(GWQS)
Carbon Tetrachloride
(5 pg/L)
Chloroform
(70 pg/L)
Chloromethane
(30 pg/L)
Methylene Chloride
(5 pg/L)
Chloride
No GWQS (mq/L)
Nitrate, Nitrate + Nitrite
(10 mg/L)
TW4-22
(nitrate pumping well started
1/26/13)
1st Qtr 3/16/05 Monitor well was not installed
2nd Qtr 5/25/05 NA 340 NA NA NA 18 2
3rd Qtr 8/31/05 <5.0 290 <5.0 <5.0 NA 157
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 19.3
3rd Qtr 8/15/07 <1.0 530 <1.0 <1.0 259 19.3
4th Qtr 10/10/07 <1.0 440 <1.0 <1.0 238 18.8
1st Qtr 3/28/08 <1.0 1,400 <1.0 <1.0 519 39.1
2nd Qtr 6/25/08 <1.0 1,200 <1.0 <1.0 271 41.9
3rd Qtr 9/10/08 1.3 6,300 <1.0 <1.0 524 38.7
4th Qtr 10/15/08 NA NA NA NA 539 36.3
11/18/08 <2.0 630 <2.0 <2.0 NA NA
1st Qtr 3/11/09 <1.0 390 <1.0 <1.0 177 20.7
2nd Qtr 6/23/09 <1.0 730 <1.0 <1.0 177 20.6
3rd Qtr 9/14/09 <1.0 2,300 <1.0 <1.0 391 40.3
4th Qtr 12/29/09 <1.0 380 <1.0 <1.0 175 17.8
1st Qtr 3/3/10 <1.0 2,200 <1.0 <1.0 427 36.8
2nd Qtr 6/14/10 <1.0 540 <1.0 <1.0 134 19.0
3rd Qtr 8/24/10 <1.0 340 <1.0 <1.0 130 15.0
4th Qtr 10/15/10 <1.0 340 <1.0 <1.0 134 16.0
1st Qtr 2/22/11 1.2 1,300 <1.0 <1.6 114 18.0
2nd Qtr 6/1/11 <1.0 210 <1.0 <1.0 138 17.0
3rd Qtr 8/17/11 <1.0 450 <1.0 <1.0 120 15.0
4th Qtr 11/16/11 NA NA NA NA 174 19.0
(1) 12/7/11 <1.0 400 <1.0 <1.0
NA NA
(2)1st Qtr 1/19/12 <1.0 200 <1.0 <1.0 36 14.0
2nd Qtr 6/13/12 <1.0 120 <1.0 <1.0 35 12.8
3rd Qtr 9/12/12 <1.0 121 <1.0 <1.0 7.0
4th Qtr 10/4/12 <1.0 330 <1.0 <1.0 130 14.0
(3)1 st Qtr 2/11/13 3.24 10,600 <1.0 <1.0 130 58.0
2nd Qtr 6/5/13 3.35 12,500 <1.0 <1.0 586 50.2
3rd Qtr 9/3/13 3.25 9,640 <1.0 <1.0 487 29.7
4th Qtr 10/29/13 8 09 13,300 <1.0 <1.0 501 45.2
1st Qtr 1/27/14 6.06 12,100 <1.0 2.83 598 54.6
2nd Qtr 5/19/14 6.65 12,400 <1.0 <1.0 614 47.2
3rd Qtr 8/11/14 1.9 12,400 40 <1.0 540 41.5
4th Qtr 10/29/14 3.32 12,400 1.61 <1.0 596 54.9
1st Qtr 3/9/15 3.77 12,700 4.31 <1.0 675 69.2
2nd Qtr 6/8/15 2.42 8,050 3.42 <1.0 390 47.1
3rd Qtr 8/31/15 <1.0 7,810 5.47 <1.0 557 64.7
4th Qtr 10/19/15 3.32 7,530 5.1 <1.0 567 56.1
1st Qtr 3/9/16 <1.0 6,070 <1.0 <1.0 583 31.1
2nd Qtr 5/23/16 2.64 8,570 <1.0 <1.0 598 58.4
3rd Qtr 7/25/16 <1.0 5,840 <1.0 <1.0 619 61.3
4th Qtr 10/12/16 1.08 3,370 <1.0 <1.0 588 61.5
1st Qtr 3/8/17 1.56 5,320 <1.0 <1.0 566 69.8
2nd Qtr 6/13/17 1.21 3,670 <1.0 <1.0 572 70.8
(1) VOCs were resampled because laboratory missed holding time.
(2) As of March 2012 both north and south wild life ponds no longer receiving water.
^3)_Chloroform £umping_well started 1/26/13.
NA = not analyzed
Shaded indicates concentrations exceeding GWQS.
Bold and italics indicates the MDL exceeded the GWQS.
TABLE 1 (24 of 29)
Historic Summary Of Monitoring Parameters Up To The 1st Quarter 2017
Chloroform Contamination Investigation
DUSA White Mesa Mill
Well
Sampling Event
Parameter
(GWQS)
Carbon Tetrachloride
(5 pg/L)
Chloroform
(70 pg/L)
Chloromethane
(30 pg/L)
Methylene Chloride
(5 pg/L)
Chloride
No GWQS (mq/L)
Nitrate, Nitrate + Nitrite
(10 mg/L)
TW4-23
2nd Qtr 6/27/07 <1.0 <1.0 <1.0 <1.0 47 <0.1
3rd Qtr 8/15/07 <1.0 <1.0 <1.0 <1.0 46 <0.1
4th Qtr 10/10/07 <1.0 <1.0 <1.0 <1.0 43 <0.1
1st Qtr 3/28/08 <1.0 <1.0 <1.0 <1.0 41 <6.1
2nd Qtr 6/25/08 <1.0 <1.0 <1.0 <1.0 41 <0.1
3rd Qtr 9/10/08 <1.0 <1.0 <1.0 <1.0 35 <0.05
4th Qtr 10/15/08 NA NA NA NA 51 <0.05
11/18/08 <2.0 <2.0 <2.0 <2.0 NA NA
1st Qtr 3/4/09 <1.0 <1.0 <1.0 <1.0 41 <0.1
2nd Qtr 6/23/09 <1.0 <1.0 <1.0 <1.0 43 <0.1
3rd Qtr 9/14/09 <1.0 <1.0 <1.0 <1.0 43 <0.1
4th Qtr 12/16/09 <1.0 <1.0 <1.0 <1.0 37 <0.1
1st Qtr 2/24/10 <1.0 <1.0 <1.0 <1.0 45 <0.1
2nd Qtr 6/14/10 <1.0 <1.0 <1.0 <1.0 40 <0.1
3rd Qtr 8/24/10 <1.0 <1.0 <1.0 <1.0 40 <0.1
4th Qtr 10/15/10 <1.0 <1.0 <1.0 <1.0 34 <0.1
1st Qtr 2/16/11 <1.0 <1.0 <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 <1.0 <1.0 40 <0.1
2nd Qtr 5/31/12 <1.0 <1.0 <1.0 <1.0 44 <0.1
3rd Qtr 8/29/12 <1.0 <1.0 <1.0 <1.0 46 <0.1
4th Qtr 10/3/12 <1.0 <1.0 <1.0 <1.0 45 <0.1
1st Qtr 2/7/13 <1.0 <1.0 <1.0 <1.0 43.6 <0.1
2nd Qtr 5/30/13 <1.0 <1.0 <1.0 <1.0 44.7 0.1
3rd Qtr 9/5/13 <1.0 <1.0 <1.0 <1.0 48 <0.1
4th Qtr 11/7/13 <1.0 <1.0 <1.0 <1.0 43 <0.1
1st Qtr 1/23/14 <1.0 <1.0 <1.0 <1.0 44.6 <0.1
2nd Qtr 5/19/14 <1.0 <1.0 <1.0 <1.0 42.3 <0.1
3rd Qtr 8/13/14 <1.0 <1.0 <1.0 <1.0 46 <0.1
4th Qtr 10/28/14 <1.0 <1.0 <1.0 <1.0 46.8 <0.1
1st Qtr 3/12/15 <1.0 <1.0 <1.0 <1.0 47.3 <6.1
2nd Qtr 6/8/15 <1.0 <10 <1.0 <1.0 48.4 <0.1
3rd Qtr 9/3/15 <1.0 <1.0 <1.0 <1.0 54.1 <0.1
4th Qtr 10/28/15 <1.0 <1.0 <1.0 <1.0 46.4 <0.1
Duplicate TW4-70 <1.0 <1.0 <1.0 <1.0 46.4 <0.1
1st Qtr 3/16/16 <1.0 <1.0 <1.0 <1.0 49.1 <0.1
2nd Qtr 5/26/16 <1.0 <1.0 <1.0 <1.0 50.4 <0.1
3rd Qtr 8/23/16 <1.0 <1.0 <1.0 <1.0 49.6 <0.1
Duplicate TW4-70 <1.0 <1.0 <1.0 <1.0 48.3 <0.1
4th Qtr 10/12/16 <1.0 <1.0 <1.0 <1.0 52.1 <0.1
1st Qtr 3/15/17 <1.0 <1.0 <1.0 <1.0 47.7 <0.1
Duplicate TW4-70 <1.0 <1.0 <1.0 <1.0 49.8 <0.1
2nd Qtr 6/15/17 <1.0 <1.0 <1.0 <1.0 51.5 <0.1
(1) As of March 2012 both north and south wild life ponds no longer receiving water.
NA = not analyzed
Shaded indicates concentrations exceeding GWQS.
TABLE 1 (25 of 29)
Historic Summary Of Monitoring Parameters Up To The 1st Quarter 2017
Chloroform Contamination Investigation
DUSA White Mesa Mill
Well
Sampling Event
Parameter
(GWQS)
Carbon Tetrachloride
(5 pg/L)
Chloroform
(70 pg/L)
Chloromethane
(30 pg/L)
Methylene Chloride
(5 pg/L)
Chloride
No GWQS (mq/L)
Nitrate, Nitrate + Nitrite
(10 mg/L)
TW4-24
(nitrate pumping well started
1/26/13)
2nd Qtr 6/27/07 <1.0 2.6 <1.0 <1.0 770 26.1
3rd Qtr 8/15/07 <1.0 2.2 <1.0 <1.0 791 29
4th Qtr 10/10/07 <1.0 1.5 <1.0 <1.0 692 24.7
1st Qtr 3/28/08 <1.0 1.5 <1.0 <1.0 740 24.4
2nd Qtr 6/25/08 <1.0 1.4 <1.0 <1.0 834 45.3
3rd Qtr 9/10/08 <1.0 2.9 <1.0 <1.0 1180 38.4
4th Qtr 10/15/08 NA NA NA NA 1130 44.8
11/18/08 <2.0 <2.0 <2.0 <2.0 NA NA
1st Qtr 3/4/09 <1.0 1.4 <1.0 <1.0 1010 30.5
2nd Qtr 6/23/09 <1.0 1.5 <1.0 <1.0 759 30.4
3rd Qtr 9/14/09 <1.0 1.4 <1.0 <1.0 618 30.7
4th Qtr 12/16/09 <1.0 1.2 <1.0 <1.0 1080 28.3
1st Qtr 2/25/10 <1.0 1.3 <1.0 <1.0 896 33.1
2nd Qtr 6/14/10 <1.0 1.7 <1.0 <1.0 639 30
3rd Qtr 8/24/10 <1.0 1.8 <1.0 <1.0 587 31
4th Qtr 10/15/10 <1.0 1.4 <1.0 <1.0 522 31
1st Qtr 2/17/11 <1.0 1.8 <1.0 <1.0 1100 31
2nd Qtr 5/26/11 <1.0 1.1 <1.0 <1.0 1110 35
3rd Qtr 8/17/11 <1.0 1.7 <1.0 <1.0 967 34
4th Qtr 11/16/11 NA NA NA NA 608 35
<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 38
(3)1st Qtr 2/11/13 <1.0 1 <1.0 <1.0 1260 35.9
2nd Qtr 6/5/13 <1.0 17.4 <1.0 <1.0 916 23.7
3rd Qtr 8/30/13 <1.0 21.8 <1.0 <1.0 998 33
4th Qtr 10/29/13 <1.0 32.5 <1.0 <1.0 1030 35
1st Qtr 1/27/14 1.18 78.5 <1.0 <1.0 809 31 6
2nd Qtr 5/19/14 <1.0 62.7 <1.0 <1.0 1020 35.0
3rd Qtr 8/11/14 <1.0 76.3 <1.0 <1.0 1150 31.5
4th Qtr 10/21/14 <1.0 25.8 <1.0 <1.0 1050 35.7
1st Qtr 3/9/16 <1.0 49.2 <1.0 <1.0 944 34.6
2nd Qtr 6/8/15 <1.0 4.28 <1.0 <1.0 1290 31.8
3rd Qtr 8/31/15 <1.0 46.9 <1.0 <1.0 788 25.3
4th Qtr 10/19/15 <1.0 25.3 <1.0 <1.0 909 29.6
ist Qtr 3/9/16 <1.0 22.8 <10 <1.0 989 29.1
2nd Qtr 5/23/16 <1.0 69.6 <1.0 <1.0 771 24.2
3rd Qtr 7/25/16 <1.0 17.8 <1.0 <1.0 1180 34.4
4th Qtr 10/12/16 <1.0 20.8 <1.0 <1.0 1010 31.9
1st Qtr 3/8/17 <10 18.3 <1.0 <1.0 1090 41.3
2nd Qtr 6/13/17 <1.0 17.2 <1.0 <1.0 1080 39.9
(1) VOCs were resampled because laboratory missed holding time.
(2) As of March 2012 both north and south wild life ponds no longer receiving water.
^3)_Chloroform gumpm^well started 1/26/13
NA = not analyzed
Shaded indicates concentrations exceeding GWQS.
TABLE 1 (26 of 29)
Historic Summary Of Monitoring Parameters Up To The 1st Quarter 2017
Chloroform Contamination Investigation
DUSA White Mesa Mill
Well Parameter
Sampling Event (GWQS)
Carbon Tetrachloride Chloroform Chloromethane Methylene Chloride Chloride Nitrate, Nitrate + Nitrite
(6 pg/L) (70 pg/L)(30 pg/L)(5 pg/L)No GWQS (mq/L) (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 <1.0 <1.0 <1.0 <1.0 328 3.3
4th Qtr 12/14/09 <1.0 <1.0 <1.0 <1.0 371 14.2
1st Qtr 2/23/10 <1.0 <1.0 <1.0 <1.0 296 14.4
2nd Qtr 6/14/10 <1.0 <1.0 <1.0 <1.0 306 16
3rd Qtr 8/10/10 <1.0 <1.0 <1.0 <1.0 250 14
4th Qtr 10/15/10 <1.0 <1.0 <1.0 <1.0 312 15
1st Qtr 2/16/11 <1.0 1.8 <1.0 <1.0 315 15
2nd Qtr 5/25/11 <1.0 <1.0 <1.0 <1.0 321 16
3rd Qtr 8/16/11 <1.0 <1.0 <1.0 <1.0 276 16
4th Qtr 11/15/11 <1.0 <1.0 <1.0 <1.0 294 16
(2)1st Qtr 1/16/12 <1.0 <1.0 <1.0 <1.0 304 16
2nd Qtr 5/31/12 <1.0 <1.0 <1.0 <1.0 287 16
3rd Qtr 9/4/12 <1.0 <1.0 <1.0 <1.0 334 17
4th Qtr 10/3/12 <1.0 <1.0 <1.0 <1.0 338 17
(3)1st 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 <1.0 857 2.16
2nd Qtr 5/19/14 <1.0 <1.0 <1.0 <1.0 51.1 1.21
3rd Qtr 8/11/14 <1.0 <1.0 <1.0 <1.0 67 1.6
4th Qtr 10/21/14 <1.0 <1.0 <1.0 <1.0 58.1 1.03
1st Qtr 3/9/15 <1.0 <1.0 <1.0 <1.0 310 14.4
2nd Qtr 6/8/15 <1.0 <1.0 <1.0 <1.0 58.3 1.14
3rd Qtr 8/31/15 <1.0 <1.0 <1.0 <1.0 69.2 1.63
4th Qtr 10/19/15 <1.0 <1.0 <1.0 <1.0 93.7 1.78
1st Qtr 3/9/16 <1.0 <1.0 <1.0 <1.0 62.7 0.837
2nd Qtr 5/23/16 <1.0 <1.0 <1.0 <1.0 75.5 0.959
3rd Qtr 7/25/16 <1.0 <1.0 <1.0 <1.0 74.1 1.78
4th Qtr 10/12/16 <1.0 <1.0 <1.0 <1.0 59.8 1.24
1st Qtr 3/8/17 <1.6 1.15 <1.0 <1.6 285 17.0
2nd Qtr 6/13/17 <1.0 <1.0 <1.0 <1.0 69.8 0.976
(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 gumpjng_well started 1/26/13.
NA = not analyzed
Shaded indicates concentrations exceeding GWQS.
TABLE 1 (27 of 29)
Historic Summary Of Monitoring Parameters Up To The 1st Quarter 2017
Chloroform Contamination Investigation
DUSA White Mesa Mill
Well Parameter
Sampling Event (GWQS)
Carbon Tetrachloride Chloroform Chloromethane Methylene Chloride Chloride Nitrate, Nitrate + Nitrite
(5 pg/L)(70 pg/L)(30 pg/L)(5 pg/L)No GWQS (mg/L)(10 mg/L)
TW4-26
2nd Qtr 6/14/10 <1.0 13 <1.0 <1.0 33 7.9
3rd Qtr 8/24/10 <1.0 5.2 <1.0 <1.0 17 9.0
4th Qtr 10/15/10 <1.0 5.4 <1.0 <1.0 22 9.6
1st Qtr 2/16/11 <1.0 2 <1.0 <1.0 30 10.0
2nd Qtr 5/26/11 <1.0 2.9 <1.0 <1.0 15 10.0
3rd Qtr 8/17/11 <1.0 2.8 <1.0 <1.0 19 11.0
4th Qtr 11/16/11 NA NA NA NA 26 10.0
|1) 12/7/11 <1.0 5.2 <1.0 <1.0 NA NA
(2)1st Qtr 1/18/12 <1.0 7 <1.0 <1.0 17 11.0
2nd Qtr 6/6/12 <1.0 4.1 <1.0 <1.0 19 12.0
3rd Qtr 9/11/12 <1.0 4.9 <1.0 <1.0 19 9.0
4th Qtr 10/3/12 <1.0 4.9 <1.0 <1.0 19 .....12.0
1st Qtr 2/7/13 <1.0 4.9 <1.0 <1.0 16.6 12.5
2nd Qtr 6/13/13 <1.0 2.12 <1.0 <1.0 14.5 13.6
3rd Qtr 9/5/13 <1.0 2.81 <1.0 <1.0 17.6 11.7
4th Qtr 11/7/13 <1.0 3.37 <1.0 <1.0 15.9 15.9
1st Qtr 1/29/14 <1.0 1.43 <1.0 <1.0 16.9 14.2
2nd Qtr 5/21/14 <1.0 4.23 <1.0 <1.0 15.4 12.5
3rd Qtr 8/11/14 <1.0 1.3 <1.0 <1.0 15 10.8
4th Qtr 10/28/14 <1.0 2.45 <1.0 <1.0 14.6 12.3
1st Qtr 3/12/15 <1.0 2.37 <1.0 <1.0 14.4 14.4
2nd Qtr 6/10/15 <1.0 6.12 1.17 <1.0 14.4 11.3
3rd Qtr 9/3/15 <1.0 4.77 <1.0 <1.0 14 14.2
4th Qtr 10/28/15 <1.0 3.45 <1.0 <1.0 13.3 13.9
1st Qtr 3/16/16 <1.0 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
3rd Qtr 8/3/16 <1.0 4.42 <1.0 <1.0 13.9 17.9
4th Qtr 10/20/16 <1.0 19.9 <1.0 <1.0 14.2 15.0
1st Qtr 3/16/17 <1.0 46.1 <1.0 <1.6 16.2 15.8
2nd Qtr 6/20/17 <1.0 244 <1.0 <1.0 19 15.21
TW4-27
(2)1st Qtr 1/18/12 <10 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 <1.6 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 27.2
4th Qtr 11/6/13 <1.0 <1.0 <1.0 <1.0 21.8 29.8
1st Qtr 1/23/14 <1.0 <1.0 <1.0 <1.0 31.8 31.3
2nd Qtr 5/21/14 <1.0 <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 <1.6 <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
ist Qtr 3/16/16 <1.0 2.lT <1.0 <1.0 28 25.0
2nd Qtr 5/26/16 <1.0 3.16 <1.0 <1.0 21.2 28.7
3rd Qtr 8/3/16 <1.0 2.78 <1.0 <1.0 27.1 21.8
4th Qtr 10/20/16 <1.0 3.8 <1.0 <1.0 29.4 19.3
1st Qtr 3/15/17 <1.0 4.33 <1.0 <1.0 28.3 222
2nd Qtr 6/15/17 <1.0 5.65 <1.0 <1.0 27.9 238
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 45.3 173
4th Qtr 11/6/13 <1.0 <1.0 <1.0 <1.0 45.3 16.2
1st Qtr 1/22/14 <1.6 <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 14.2
4th Qtr 10/23/14 <1.0 <1.0 <1.0 <1.0 52.1 16.5
1st Qtr 3/11/15 <1.0 <1.0 <1.0 <1.0 52.2 19.0
2nd Qtr 6/10/15 <1.0 <1.0 <1.0 <1.0 56.4 19.0
3rd Qtr 9/2/15 <1.0 <1.0 <1.0 <1.0 61.4 17.8
4th Qtr 10/21/15 <1.0 <1.0 <10 <1.0 52.7 18.7
1st Qtr 3/15/16 <1.0 <1.0 <1.0 <1.0 61.6 34.0
Duplicate TW4-65 <1.0 <1.0 <1.0 <1.0 61.4 32.6
2nd Qtr 5/25/16 <1.0 <1.0 <1.0 <1.0 67.1 29.0
3rd Qtr 7/27/16 <1.0 <1.0 <1.0 <1.0 70.1 31.3
Duplicate TW4-65 <1.0 <1.0 <1.0 <1.0 70.9 35.6
4th Qtr 10/19/16 <1.0 <1.0 <1.0 <1.0 70.9 25.5
Duplicate TW4-65 <1.0 <1.0 <1.0 <1.0 73.7 25.4
1st Qtr 3/14/17 <1.0 <1.0 <1.0 <1.0 64.2 24.4
Duplicate TW4-65 <1.0 <1.0 <1.0 <1.0 66.4 27.9
2nd Qtr 6/14/17 <1.0 <1.0 <1.0 <1.0 68.6 26.0
Duplicate TW4-65 <1.0 <1.0 <1.0 <1.0 68.2 25.8
(1) VOCs were resampled because laboratory missed holding time.
NA = not analyzed
Shaded indicates concentrations exceeding GWQS.
TABLE 1 (28 of 29)
Historic Summary Of Monitoring Parameters Up To The 1st Quarter 2017
Chloroform Contamination Investigation
□USA White Mesa Mill
Well
Sampling Event
Parameter
(GWQS)
Carbon Tetrachloride
(5 ug/D
Chloroform
(70 pg/L)
Chloromethane
(30 pg/L)
Methylene Chloride
(5 pg/L)
Chloride
No GWQS (mq/L)
Nitrate, Nitrate + Nitrite
(10 mq/L)
TW4-29
2nd Qtr 6/19/13 <1.0 242 <1.0 <1.0 44.8 4.60
2nd Qtr 7/11/13 <1.0 262 <1.0 <1.0 37.7 3.52
3rd Qtr 9/26/13 <1.0 246 <1.0 <1.0 41.4 4.18
4th Qtr 11/13/13 <1.0 260 <1.0 <1.0 42.5 4.11
1st Qtr 2/5/14 <1.0 258 <1.0 <1.0 14.9 4.63
2nd Qtr 5/22/14 <1.0 262 <1.0 <1.0 38.2 3.52
3rd Qtr 8/27/14 <1.0 242 <1.0 <1.0 41 3.40
4th Qtr 10/29/14 <1.0 290 <1.0 <1.0 41 3.64
1st Qtr 3/12/15 <1.0 299 <1.0 <1.0 40.5 4.14
2nd Qtr 6/11/15 <1.0 329 <1.0 <1.0 42.5 2.95
3rd Qtr 9/3/15 <1.0 276 <1.0 <1.0 47.3 2.19
4th Qtr 10/29/15 <1.0 631 <1.0 <1.0 39.8 2.74
1st Qtr 3/17/16 <1.0 335 <1.0 <1.0 40.5 2.92
2nd Qtr 6/8/16 <1.0 366 <1.0 <1.0 42.9 2.51
3rd Qtr 8/3/16 <1.0 401 <1.0 <1.0 40.6 2.44
4th Qtr 10/26/16 <1.0 392 <1.0 <1.0 44.2 2.40
1st Qtr 3/16/17 <1.0 446 <1.0 <1.0 41.5 2.24
2nd Qtr 6/21/17 <1.0 420 <1.0 <1.0 42 2.26
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 Qtr 1/23/14 <1.0 <1.0 <1.0 <1.0 36.9 1.36
2nd Qtr 5/22/14 <1.0 <1.0 <1.0 <1.0 31.9 1.44
3rd Qtr 8/13/14 <1.0 <1.0 <1.0 <1.0 38 1.5
4th Qtr 10/23/14 <1.0 <1.0 <1.0 <1.0 37.1 1.84
1st Qtr 3/11/15 <1.0 1.65 <1.0 <1.0 38.3 2.15
2nd Qtr 6/11/15 <1.0 2.25 <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
ist 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
3rd Qtr 8/3/16 <1.0 6.79 <1.0 <1.0 38.6 232
4th Qtr 10/20/16 <1.0 8.69 <1.0 <1.0 41.3 2.51
1st Qtr 3/15/17 <1.0 13.6 <1.0 <1.0 37.7 2.70
2nd Qtr 6/15/17 <1.0 15.2 <1.0 <1.0 37.8 2.95
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 <1.6 <1.6 <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 <1.0 <1.0 <1.0 29.1 0.953
1st Qtr 3/16/16 <1.0 <1.0 <1.0 <1.0 31.5 1.84
2nd Qtr 5/25/16 <1.0 <1.0 <1.0 <1.0 32.5 1.36
3rd Qtr 7/28/16 <1.0 <1.0 <1.0 <1.0 30.6 1.41
4th Qtr 10/20/16 <1.0 <1.0 <1.0 <1.0 34 1.14
1st Qtr 3/15/17 <1.0 <1.0 <1.0 <1.0 31.3 1.19
2nd Qtr 6/15/17 <1.0 <1.0 <1.0 <1.0 33.4 1.21
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
3rd Qtr 7/28/16 <1.0 <1.0 <1.0 <1.0 64.4 3.44
4th Qtr 10/19/16 <1.0 <1.0 <1.0 <1.0 66 2.87
1st Qtr 3/17/17 <1.0 <1.0 <1.0 <1.0 62.8 282
2nd Qtr 6/15/17 <1.0 <1.0 <1.0 <1.0 53.5 2.37
Shaded indicates concentrations exceeding GWQS.
TABLE 1 (29 of 29)
Historic Summary Of Monitoring Parameters Up To The 1st Quarter 2017
Chloroform Contamination investigation
DUSA White Mesa Mill
Well
Sampling Event
Parameter
(GWQS)
Carbon Tetrachloride
(5 pg/L)
Chloroform
(70 pg/L)
Chloromethane
(30 pg/L)
Methylene Chloride
(5 pg/L)
Chloride
No GWQS (mq/L)
Nitrate, Nitrate + Nitrite
(10 mg/L)
TW4-33
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 <1.6 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
3rd Qtr 8/4/16 <1.0 121 <1.0 <1.0 48.5 2.32
4th Qtr 10/26/16 <1.0 109 <1.0 <1.0 52.4 2.36
1st Qtr 3/17/16 <1.0 90.7 <1.0 <1.0 49.0 2.11
2nd Qtr 6/20/17 <1.0 103 <1.0 <1.0 49.2 2 34
TW4-34
4th Qtr 11/14/13 <1.0 <1.0 <1.0 <1.0 19.2 1.64
1st Qtr 1/23/14 <1.0 <1.0 <1.0 <1.0 20.4 1.93
2nd Qtr 5/22/14 <1.0 <1.0 <1.0 <1.0 17.9 1.69
3rd Qtr 8/13/14 <1.0 <1.0 <1.0 <1.0 18 1.10
4th Qtr 10/29/14 <1.0 <1.0 <1.0 <1.0 17.8 1.16
1st Qtr 3/11/15 <1.0 <1.0 <1.0 <1.0 17.7 1.21
2nd Qtr 6/11/15 <1.0 <1.0 <1.0 <1.0 17.4 0.868
3rd Qtr 9/3/15 <1.0 <1.0 <1.0 <1.0 15.1 0.458
4th Qtr 10/21/15 <1.0 <1.0 <1.0 <1.0 15.8 0.368
1st Qtr 3/16/16 <1.0 <1.0 <1.0 <1.0 17.3 0.925
2nd Qtr 5/25/16 <1.0 <1.0 <1.0 <1.0 18 0.605
3rd Qtr 8/3/16 <1.0 <1.0 <1.0 <1.0 17.2 0.726
4th Qtr 10/20/16 <1.0 <1.0 <1.0 <1.0 19 0.612
1st Qtr 3/15/17 <1.0 <1.0 <1.0 <1.0 18.0 0.674
2nd Qtr 6/15/17 <1.0 <1.0 <1.0 <1.0 15.7 0.727
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 0304
4th Qtr 10/28/15 <1.0 <1.0 <1.0 <1.0 33.4 0.419
1st Qtr 3/16/16 <1.0 <1.0 <1.0 <1.0 35.4 0.521
2nd Qtr 5/26/16 <1.0 <1.0 <1.0 <1.0 35.4 0.631
3rd Qtr 8/3/16 <1.0 <1.0 <1.0 <1.0 34.8 0.723
4th Qtr 10/20/16 <1.0 <1.0 <1.0 <1.0 37.1 0.626
1st Qtr 3/15/17 <1.0 <1.0 <1.0 <1.0 33.7 0.673
2nd Qtr 6/15/17 <1.0 <1.0 <1.0 <1.0 34.8 0.699
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 <10 <1.0 <1.0 <1.0 67.2 <6.1
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
Ist Qtr 3/11/16 <i.6 <1.0 <i.6 <i.6 67,2 <6.1
2nd Qtr 5/25/16 <1.0 <1.0 <1.0 <1.0 72 3 <0.1
3rd Qtr 7/28/16 <1.0 <1.0 <1.0 <1.0 694 <0.1
4th Qtr 10/20/16 <1.0 <1.0 <1.0 <1.0 738 <0.1
Duplicate TW4-70 <1.0 <1.0 <1.0 <1.0 72 <0.1
1st Qtr 3/15/17 <1.0 <1.0 <1.0 <1.0 60.2 <0.1
2nd Qtr 6/15/17 <1.0 <1.0 <1.0 <1.0 71.3 <0.1
TW4-37(chlorolorm
pumping well 619/15)
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 1.04 374 324
4th Qtr 10/19/15 12.5 19l500 938 1.17 399 34.6
1st Qtr 3/9/16 15.8 17,500 3.57 1.34 332 28.4
2nd Qtr 5/23/16 14.4 16,200 3.57 1.17 389 27.9
3rd Qtr 7/25/16 16.7 15,900 <1.0 <1.0 294 33.4
4th Qtr 10/12/16 16.3 16,400 <1.0 <1.0 304 26.1
1st Qtr 3/8/17 15.4 18,000 3.57 1.34 305 32.3
2nd Qtr 6/15/17 16.2 15,800 <1.0 <1.0 281 31.2
TW4-38
4th Qtr 11/10/16 <1.0 <1.0 <1.0 <1.0 40.0 11.2
1st Qtr 3/15/17 <1.0 <1.0 <1.0 <i.6 35.7 10.6
2nd Qtr 6/15/17 <1.0 <1.0 <1.0 <1.0 36.2 10 8
Duplicate TW4-70 <1.0 <1.0 <1.0 <1.0 370 10.1
TW4-3 9 (chloroform
pumping well 11/2016)
4th Qtr 11/11/16 <1.0 2,800 <1.0 <1.0 689 20.7
1st Qtr 3/8/17 8.15 6,460 <1.0 1.35 130 6.44
2nd Qtr 6/15/17 8.2 5,560 <1.0 1.31 120 6.25
Shaded indicates concenti•ations exceeding GWQS.
(1) VOCs were resampled because laboratory missed holding time.
Table 2
Summary of QA/QC Samples
2nd Quarter 2017
Parameter GWQS Duplicate of TW4-28 Duplicate of TW4-38 Duplicate of TW4-16
TW4-28 TW4-65 RPD TW4-38 TW4-70 RPD TW4-16 TW4-75 RPD
Chloride none 68.6 68.2 0.6 36.2 37 -2.2 60.6 60.4 0.3
Nitrate + Nitrite (as N)10 mg/L 26.0 25.8 0.8 10.8 10.1 6.7 1.81 1.9 -4.9
Chloroform 70 pg/L <1.0 <1.0 nc <1.0 <1.0 nc 64.3 68.7 -6.6
Carbon tetrachloride 5 pg/L <1.0 <1.0 nc <1.0 <1.0 nc <1.0 <1.0 nc
Chloromethane 30 pg/L <1.0 <1.0 nc <1.0 <1.0 nc <1.0 <1.0 nc
Methylene Chloride 5 pg/L <1.0 <1.0 nc <1.0 <1.0 nc <1.0 <1.0 nc
nc = not calculated
label 3
Chloroform Mass Removal Calculations for the 2nd Qurater 2017
EFR 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 TW4-39
''’Chloroform (ug/L)
Chloroform (g/L)
Chloroform (Ibs/L)
Chloroform (Ibs/gal)
Total gallons pumped 2nd qtr 2017
lbs of chloroform removed
Gallons of chloroform removed
1,430
1.43E-03
3.16E-06
1.20E-05
72,299.8
0.9
0.07
2,450
2.45E-03
5.41 E-06
2.05E-05
25,921.8
0.5
0.04
0
0.00E+00
0.00E+00
0.00E+00
42,550.6
0.00
0.00
977
9.77E-04
2.16E-06
8.17E-06
18,200.2
0.15
0.01
1,940
1.94E-03
4.29E-06
1.62E-05
18,716.7
0.30
0.02
1,290
1.29E-03
2.85E-06
1.08E-05
23,244.9
0.25
0.02
3,370
3.37E-03
7.45E-06
2.82E-05
2,845.9
0.08
0.01
510
5.10E-04
1.13E-06
4.27E-06
109,943
0.5
0.04
18,100
1.81E-02
4.00E-05
1.51E-04
12,475.3
1.89
0.15
224
2.24E-04
4.95E-07
1.87E-06
60,969.7
0.11
0.01
3,670
3.67E-03
8.11 E-06
3.07E-05
23,685
0.73
0.06
17.2
1.72E-05
3.80E-08
1 44E-07
52,808.7
0.01
0.001
0
O.OOE+OO
0.00E+00
0.00E+00
101,617.2
0.00
0.00
15,800
1.58E-02
3.49E-05
1.32E-04
93,191.3
12.31
1.00
5,560
5.56E-03
1.23E-05
4.65E-05
41,313.0
1.92
0.16
total lbs of chloroform removed 19.6
total gallons of chloroform removed 1.6
1) Assuming that the chloroform concentration result for the quarter monitoring event is the average chloroform concentration for the entire quarter.
Chloroform Pumping Wells
Nitrate Pumping Wells