DRC-2017-010607 - 0901a0688079da3c

State of Utah
GARY R HERBERT
Governor
SPENCERJ COX
Lieutenant Governor
Department of
Environmental Quality
Alan Matheson
Executive Director
DIVISION OF WASTE MANAGEMENT
AND RADIATION CONTROL
Scott T Anderson
Director
DRC-ZOl7-OIOfco7
MEMORANDUM
TO:
FROM:
DATE:
Phil Goble Pfc X3/?
Dean Henderson ) / 2 / ^ ^
December 26, 2017
SUBJECT: Review of the 3rd Quarter, 2017 Chloroform Monitoring Reports for the Chloroform
Contamination Investigation, Energy Fuels Resources (USA) Inc. (“EFR“) White Mesa
Uranium Mill, near Blanding, Utah.
The Utah Division of Waste Management and Radiation Control (“Division”) has reviewed the
November 27, 2017 3rd 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
MW-26
MW-32
TW4-1
TW4-8
TW4-9
TW4-10
TW4-11
TW4-20
TW4-21
TW4-22
TW4-23
TW4-30
TW4-31
TW4-32
TW4-33
195 North 1950 West • Salt Lake City, UT
Mailing Address PO Box 144880 • Salt Lake City, UT 84114-4880
Telephone [phone] • Fax [phone] • F D D. [phone]
www.deq.ntnli.gov
Primed on 100% recycled paper
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TW4-2
TW4-3
TW4-4
TW4-5
TW4-6
TW4-7
TW4-12
TW4-13
TW4-14
TW4-16
TW4-18
TW4-19
TW4-24
TW4-25
TW4-26
TW4-27
TW4-28
TW4-29
TW4-34
TW4-35
TW4-36
TW4-37
TW4-38
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, TW4-16, 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, TW4-12, TW4-13, TW4-14, TW4-26, TW4-27, TW4-29, TW4-30,
TW4-31, TW4-33, TW4-34, TW4-35, and TW36.
3. Pumping Wells: MW-4, MW-26, TW4-1, TW4-2, TW4-4, TW4-11, TW4-19, TW4-20, TW4-
21, TW4-22, TW4-24, TW4-25, TW4-37, and TW4-39.
The water samples for the above wells were analyzed for the following constituents as required in the
QAP:
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
Chloroform
Chloromethane
Carbon tetrachloride
Chloride
Methylene chloride
Nitrate + Nitrite as Nitrogen.
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.
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EFR Duplicate Sample Comparison
Three duplicate samples were collected. Monitor well TW4-3 and its duplicate sample TW4-65, TW4-
12 and its duplicate sample TW4-70, and TW4-38 and its duplicate sample TW4-75. 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 1.E.3
of the Permit:
• The quarterly groundwater compliance monitoring wells.
• Existing monitoring well MW-4 and all of the temporary chloroform investigation wells.
• Piezometers P-1, P-2, P-3A, P-4 and P-5.
• MW-20 and MW-22.
• Nitrate monitoring wells.
• The DR piezometers which were installed during the Southwest Hydrologic Investigation.
In addition, weekly and monthly depth to groundwater measurements were taken in pumping wells
MW-4, MW-26, TW4-1, TW4-2, TW4-4, TW4-11, TW4-19, TW4-20, TW4-21, TW4-22, TW4-24,
TW4-25, TW4-37, TW4-38, 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 3rd Quarter 2017 is 28.5 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 1,948 lbs. in the 3rd Quarter, 2017. As per
Part III.B.2 of the GCAP, the electronic files were used in 3rd 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 3rd 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 1I1.B.2 and
Appendix A of the GCAP.
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Reporting
The Report included the following information as required in the QAP:
a) Introduction
b) Sampling and Monitoring Plan
-Description of monitor wells
-Description of sampling methodology, equipment and decontamination procedures
-Identify all quality assurance samples, e.g. trip blanks, equipment blanks,
duplicate samples
c) Data Interpretation
-Interpretation of groundwater levels, gradients, and flow directions.
Interpretations will include a discussion on: 1) A current site groundwater
contour map, 2) hydrographs to show groundwater elevation in each
monitor well over time, 3) depth to groundwater measured and
groundwater elevation from each monitor well summarized in a data table,
that includes historic groundwater level data for each well, and 4) an
evaluation of the effectiveness of hydraulic capture of all contaminants of
concern.
-Interpretation of all analytical results for each well, including a discussion
on: 1) a current chloroform isoconcentration map with one of the
isoconcentration lines showing the 70 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.
I) Copies of DUSA field records, laboratory reports and chain of custody forms.
Evaluation of the Chloroform Contaminate Plume and Its Associated Contaminants
Bounding Chloroform Plume
Groundwater monitoring data up to the 3rd Quarter, 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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For the second consecutive quarterly sampling event TW4-26 exceeding the chloroform GWQS of 70
pg/L with a concentration of 419 pg/L (see Table 1 below). TW4-26 is located at the southern
downgradient end of the Plume. This second consecutive exceedance of the GWQS for chloroform in
TW4-26 requires EFR to follow corrective action activities in GCAP Part II.H. In accordance the
GCAP Part II.H.l, EFR has in a letter dated and received by the Division on November 27, 2017
provided the Division in an Exceedance Notice for well TW4-26 (see Attachment 1 below). Also, in
accordance the GCAP Part II.FI.2 EFR is required to submit within 60 days after the time of submittal of
the quarterly report (3rd quarter 2017) that demonstrates an exceedance a plan and schedule (“Plan”) for
remedial actions to address and resolve the exceedance at TW4-26 for Director approval. The 3rd
quarter 2017 report was received by the Division on November 28, 2017 therefore; EFR has until
January 27, 2018 to submit Plan.
Compliance well TW4-12 for the third consecutive sampling event had a detectible chloroform
concentration of 1.19 pg/L. No action recommended other than watching how future chloroform
concentrations will trend.
Performance Monitor Wells (“PM”) [Wells Exceeding Chloroform Concentrations GWQS of 70pa/Ll
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”) [Wells with Chloroform Concentrations between < 1 and 70pg/L1
Six CM wells range with detectable chloroform concentration but still below 70pg/L 3rd Quarter, 2017:
TW4-5, TW4-12, TW4-14, TW4-18, TW4-27, and TW4-30.
CM Wells Below the Laboratory Chloroform Detection Limit (<1.0 pg/L)
Eleven 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
3rd 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 (10.1 mg/1) the nitrate GWQS. The source of these nitrate
Page 6
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 (1320 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 419 pg/L for the second consecutive time in the 3rd quarter, 2017.
Corrective action activities for the chloroform exceedance may also provide corrective action for the
nitrate exceedance.
TW4-27 source of nitrate may not be from the chloroform plume because it’s outside plume boundary
with a chloroform concentration of 6.05 pg/L in the 3rd Quarter, 2017. Because well TW4-31 is
approximately 200 feet down gradient of TW4-27 that has a nitrate concentration below the GWQS of
1.11 mg/L in the 3rd 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 3rd Quarter, 2017 Chloroform Monitoring Report for the chloroform contamination investigation.
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References
EFR Quality Assurance Plan, June 7, 2012 (Revision. 7.2)
EFR issued Ground Water Quality Discharge Permit No. UGW370004. Permit version that was
signed on August 24, 2012.
EFR Groundwater Corrective Action Plan, September 14, 2015 (Revision 0)
EFR 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.FI.2 for Exceedances in TW4-09 in the
Second Quarter of 2016, September 9, 2016. (DRC-2016-010003)
EFR, Letter, White Mesa Uranium Mill Chloroform Monitoring Report 2nd (January through
March) Quarter 2017, November 27,2017. (DRC-2017-009522)
EFR, 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, November 27,2017.
Utah Department of Environmental Quality Division of Radiation Control Guidance for
Groundwater Split Sampling Collection at Uranium Mill Operations, August 7, 2007.
Attachment 1
EFR November 27, 2017 Exceedance Notice
Energy Fuels Resources (USA) Inc.
225 Union Blvd. Suite 600
Lakewood, CO, US, 80228
303 974 2140
www.energvfuels.com
November 27, 2017
VIA PDF AND OVERNIGHT DELIVERY
Scott Anderson,
Director of Waste Management and Radiation Control
State of Utah Department of Environmental Quality
195 North 1950 West
P.O. Box 144880
Salt Lake City, UT 84114-4880
Re: 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
Dear Mr. Anderson:
EFRI performed third quarter 2017 chloroform monitoring during the period from July 1, to September
30, 2017 under the September 14, 2015 GCAP, included as Attachment 1 to the duly executed SCO.
Part II.G of the GCAP states that “An exceedance shall be defined as the presence of chloroform in any
Compliance Monitoring Well in excess of the Table 2 Groundwater Corrective Action Limit (“GCAL”)
(70 ug/1) for two or more consecutive quarters.” Further, Part II.H.l) states that “At any time EFR[I]
submits a quarterly report that demonstrates an exceedance (second quarter of chloroform exceedance),
EFR[I] will provide a written exceedance notice to the Director (“Exceedance Notice”) for all wells that
have demonstrated such an exceedance.” Pursuant to Part II.H.l of the GCAP, please note that the
concentrations of chloroform in TW4-26 exceeded the respective GCAL of 70 ug/L for two or more
consecutive quarters as noted on Table 1 attached.
This letter serves as the Exceedance Notice required pursuant to Part II.H.l) of the GCAP.
Part II.H.2) of the GCAP requires that within 60 days after the time of submittal of a quarterly report that
demonstrates an exceedance, EFRI will provide a plan and schedule for remedial actions to address
excursion for Director approval. A Plan and Time Schedule as required by II.H.2) will be submitted
under separate cover within the timeframe specified.
If you should have any questions regarding this submittal please contact me at [phone].
Yours truW,
ENERGY FUELS RESOURCES (USA) INC.
Kathy Weinel
Quality Assurance Manager
cc:David Frydenlund, Paul Goranson, David Turk, Logan Shumway, Scott Bakken
Table 1
TW4-26 Data
TYV4-26 Chloroionn
(«g/l)
Carbon
Tetrachloride
(ug/N
Chloromctliane
(ug/1)
Methylene
Chloride
(ug/1)
Nitrate
(mg/1)
Chloride
(mg/l)
15-Jun-10 13 <1 <1 <1 7.9 33
11-Aug-10 5 <1 <1 <1 9 17
6-Oct-lO 5.4 <1 <1 <1 9.6 22
22-Feb-l1 2.0 ND ND ND 10 30
26-May-11 2.9 ND ND ND 10 15
17-Aug-l 1 2.8 ND ND ND 11 19
7-Dec-11 5.2 ND ND ND 10 26
18-Jan-12 7.0 ND ND ND 11 17
6-Jun-12 4.1 ND ND ND 12 19
11-Sep-12 4.9 ND ND ND 9 19
3-Oct-12 6.0 ND ND ND 12 19
7-Feb-13 5.0 ND ND ND 12.5 16.6
13-Jun-13 2.1 ND ND ND 13.6 14.5
5-Sep-13 2.8 ND ND ND 11.7 17.6
7-Nov-13 3.4 ND ND ND 15.9 15.9
29-Jan-14 1.4 ND ND ND 14.2 16.9
21-May-14 4.2 ND ND ND 12.5 15.4
11-Aug-14 1.3 ND ND ND 10.8 15
28-Oct-14 2.45 ND ND ND 12.3 14.6
12-Mar-15 2.37 ND ND ND 14.4 14.4
10-Jun-15 6.12 ND 1.17 ND 11.3 14.4
3-Sep-15 4.77 ND ND ND 14.2 14.0
28-Oct-15 3.45 ND ND ND 13.9 13.3
16-Mar-16 1.80 ND ND ND 16.9 13.7
26-May-16 8.23 ND ND ND 15.2 13.9
3-Aug-16 4.42 ND ND ND 17.9 13.9
20-Oct-16 19.9 ND ND ND 15.0 14.2
16-Mar-17 46.1 ND ND ND 15.8 16.2
20-Jun-17 244 ND ND ND 15.2 19.0
3-Aug-17 419 ND ND ND 15.2 25.8
TABLE 1 (1 of 29)
Historic Summary Of Monitoring Parameters Up To The 3rd Quarter 2017
Chloroform Contamination Investigation
DUSA White Mesa Mill
Well
Sampling Event
Parameter
(GWQS)
Carbon Tetrachloride
(5 lifl/L)
Chloroform
(70 UQ/U
Chloromethane
(30 pg/L)
Methylene Chloride
(5 pg/L)
Chloride
No GWQS (mq/L)
Nitrate, Nitrate + Nitrite
(10 mg/L)
MW-4 (chlorofofm
pumping well started pumping3/4/03)
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 <SO <50 49 6.0
2nd Qtr 6/14/06 <50 3,000 <50 <50 49 6.0
3rd Qtr 7/20/06 <50 2,820 <50 <50 48 1.2
4th Qtr 11/8/06 2.1 2,830 1.4 <1.0 50 6.4
1st Qtr 2/28/07 1.6 2,300 <1.0 <1.0 47 6.3
2nd Qtr 6/27/07 1.8 2,000 <1.0 <1.0 45 7.0
3rd Qtr 8/15/07 1.9 2,600 <1.0 <1.0 47 6.2
4th Qtr 10/10/07 1.7 2,300 <1.0 <1.0 45 62
1st Qtr 3/28/08 1.7 2,400 <1.0 <1.0 42 5.8
2nd Qtr 6/25/08 1.8 2,500 <1.0 <1.0 42 6.1
3rd Qtr 9/10/08 1.8 1,800 <1.0 <1.0 35 6.4
4th Qtr 10/15/08 1.7 2,100 <1.0 <1.0 45 5.9
1st Qtr 3/4/09 1.5 2,200 <1.0 <1.0 37 5.7
2nd Qtr 6/23/09 1.3 1,800 <1.0 <1.0 34 5.2
3rd Qtr 9/14/09 1.4 2,000 <1.0 <1.0 43 5.3
4th Qtr 12/14/09 1.6 ...............1,800 <1.0 <1.0 44 5.8
1st Qtr 2/17/10 1.2 1,600 <1.0 <1.0 45 4.0
2nd Qtr 6/14/10 1.2 2,100 <1.0 <1.0 41 5.1
3rd Qtr 8/6/10 1.5 1,900 <1.0 <1.0 38 4.8
4th Qtr 10/15/10 1.4 1,500 <1.0 <1.0 41 4.9
1st Qtr 2/23/11 1.5 1,700 <1.0 <1.0 40 4.6
2nd Qtr 6/1/11 1.4 1,700 <1.0 <1.0 35 4.9
3rd Qtr 8/17/11 1.1 1,700 <1.0 <1.0 41 4.9
4th Qtr 11/16/11 1.3 1,600 <1.0 <1.0 40 5.1
(1)1st Qtr 1/23/12 1 1,500 <1.0 <1.0 41.0 4.8
2nd Qtr 6/6/12 1.2 1,400 <1.0 <1.0 39.0 4.9
3rd Qtr 9/4/12 1.5 1,500 <1.0 <1.0 41.0 5.0
4th Qtr 10/4/12 1 1,300 <1.0 <1.0 41.0 4.8
1st Qtr 2/11/13 1.48 1,670 <1.0 <1.0 37.8 4.78
2nd Qtr 6/5/13 1.31 1,490 <1.0 <1.0 44.0 4.22
3rd Qtr 9/3/13 1.13 1,520 <1.0 <1.0 41.4 4.89
4th Qtr 10/29/13 5.58 1*4 IP <1.0 <1.0 40.1 5.25
1st Qtr 1/27/14 4.15 1,390 <1.0 <1.0 38.5 4.7
2nd Qtr 5/19/14 5.21 1,390 <1.0 <1.0 39.9 4.08
3rd Qtr 8/11/14 7.6 1,490 <1.0 <1.0 41.0 3.7
4th Qtr 10/21/14 <1.0 ...............1.440 <1.0 <1.0 41.5 5.07
1st Qtr 3/9/15 1.26 1,400 <1.0 <1.0 40.7 5.75
2nd Qtr 6/8/15 <1.0 1,300 <1.0 <1.0 43.1 2.53
3rd Qtr 8/31/15 <1.0 1,200 1.42 <1.0 44.3 4.79
4th Qtr 10/19/15 <1.0 1,200 <1.0 <1.0 40.8 4.43
1st Qtr 3/9/16 <1.0 1,240 <1.0 <1.0 42.2 5.15
2nd Qtr 5/23/16 1.44 1,580 <1.0 <1.0 43.7 4.54
3rd Qtr 7/25/16 <1.0 1,430 <1.0 <1.0 42.5 4.95
4th Qtr 10/12/16 1.24 1,470 <1.0 <1.0 44.8 4.88
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
3rd Qtr 7/26/17 1.15 1.400 <1.0 <1.0 43.8 4.59
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|<1.6 <1.0 60 7.1
Well abandonded
(1) As of March 2012 both north and south wild life ponds no longer receiving water.
NA = not analyzed
Shaded indicates concentrations exceeding GWQS.
Bold and italics indicates the MDL exceeded the GWQS.
TABLE 1 (2 of 29)
Historic Summary Of Monitoring Parameters Up To The 1st Quarter 2017
Chloroform Contamination Investigation
DUSA White Mesa Mill
Well
Sampling Event
Parameter
(GWQS)
Carbon Tetrachloride
<5pg/L)
Chloroform
(70 Mg(L)
Chloromethane
(30 pg/L)
Methylene Chloride
(5 Mg/L)
Chloride
No GWQS (mg/L)
Nitrate, Nitrate + Nitrite
(10 mg/L)
MW-26 (former TW4-15)
Chloroform pumping well started
8/8/03
1st Qtr 3/16/05 NA 310 NA NA NA 0.3
2nd Qtr 5/25/05 NA 442 NA NA NA 0.2
3rd Qtr 8/31/05 <5.0 960 5.4 <5.0 NA 0.2
4th Qtr 12/7/05 <50 1,000 <50 <50 55 0.3
1st Qtr 3/9/06 <50 1,100 <50 <50 52 0.2
2nd Qtr 6/14/06 <50 830 <50 <50 52 0.2
3rd Qtr 7/20/06 <50 2,170 <50 <50 65 1.4
4th Qtr 11/8/06 <1.0 282 <1.0 2.6 54 0.3
1st Qtr 2/28/07 <1.0 570 <1.0 5.5 56 0.6
2nd Qtr 6/27/07 <1.0 300 <1.0 13 49 0.4
3rd Qtr 8/15/07 <1.0 1,400 <1.0 36 57 1
4th Qtr 10/10/07 <1 0 2,000 <1 0 14 57 0.6
1st Qtr 3/28/08 <1.0 930 <1.6 40 49 0.1
2nd Qtr 6/25/08 <1.0 1,300 <1.0 53 57 0.6
3rd Qtr 9/10/08 <1.0 630 <1.0 24 44 0.2
4th Qtr 10/15/08 NA NA NA NA 64 0.1
11/18/08 <2.0 1,700 <2.0 100 NA NA
1st Qtr 3/4/09 <1.0 950 <1.0 51 49 0.4
2nd Qtr 6/23/09 <1.0 ............. 410 <1.0 12 48 0.2
3rd Qtr 9/14/09 <1.0 850 <1.0 30 46 0.1
4th Qtr 12/14/09 <1.0 1,100 <1.0 40 60 2.3
1st Qtr 2/17/10 <1.0 730 <1.0 19 57 0.2
2nd Qtr 6/14/10 1.2 1,600 <1.0 <1.0 40 6.8
3rd Qtr 8/16/10 <1.0 2,200 <1.0 21 49 0.6
4th Qtr 10/15/10 <1.0 970 <1.0 6.5 65 0.7
1st Qtr 2/23/11 <1.0 450 <1.0 3.6 57 0.5
2nd Qtr 5/31/11 <1.0 1,800 <1.0 1.3 88 0.4
3rd Qtr 8/17/11 <1.0 720:<1.0 7.2 58 0.9
4th Qtr 11/16/11 NA NA NA NA 69 2.0
(1)12/5/11 <1.0 ......1.800 <1.0 2.9 NA NA
(2)1 st Qtr 2/7/12 <1.0 2,400 <1.0 16 98 1.7
2nd Qtr 6/6/12 <1.0 3,000 <1.0 21 73 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 1,410 <1 4.03 72.3 1.38
1st Qtr 1/27/14 <1.0 1,400 <1.0 13.8 59.4 0.55
2nd Qtr 5/19/14 <1.0 ...............1,960 <1.0 15.4 53.4 0.93
3rd Qtr 8/11 /14 <1.0 2,120 8.7 , 26 59 0.7
4th Qtr 10/21/14 <1.0 2,090 <1.0 23.2 60.1 0.93
1st Qtr 3/9/15 <1.0 1,980 <1.0 27.4 56.5 0.73
2nd Qtr 6/8/15 <1.0 1,980 <1.0 iii 62 0.42
3rd Qtr 8/31/15 <1.0 2,350 4.05 11.6 69.6 0.68
4th Qtr 10/19/15 <1.0 2,680 1.32 8.28 62.6 0.991
1st Qtr 3/9/16 <1.0 2,650 <1.0 4.66 68.3 1.45
2nd Qtr 5/23/16 <1.0 2,220 <1.0 4.57 66.2 1.12
3rd Qtr 7/25/16 <1.0 3,190 <1.0 7.81 66.4 1.57
4th Qtr 10/12/16 <1.0 . 2.510 <1.0 4.31 66.2 1.18
1st Qtr 3/8/17 <1.6 1,290 <1.0 7.65 58.4 0.768
2nd Qtr 6/13/17 <1.0 2,450 <1.0 7JS9 64.3 0.922
3rd Qtr 7/26/17 <1.0 -------------L230 <1.0 5.26 61.4 1.56
(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)(Spg/L)No GWQS (mq/L)(10 mg/L)
MW-32 (former TW4-17)
1st Qtr 3/16/05 NA <1.0 NA NA NA <0.1
2nd Qtr 5/25/05 NA <1.0 NA NA NA <0.1
3rd Qtr 8/31/05 <1.0 <1.0 3.2 <1.0 NA <0.1
4th Qtr 12/7/05 <1.0 <1.0 <1.0 <1.0 33 <0.1
1st Qtr 3/9/06 <1.0 <1.0 <1.0 <1.0 32 <0.1
2nd Qtr 6/14/06 <1.0 <1.0 3.5 <1.0 30 <0.1
3rd Qtr 7/20/06 <1.0 <1.0 1.8 <1.0 32 <1.0
4th Qtr 11/8/06 <1.0 <1.0 1.5 <1.0 31 <1
1st Qtr 2/28/07 <1.0 <1.0 <1.0 <1.0 32 <1.0
2nd Qtr 6/27/07 <1.0 <1.0 <1.0 <1.0 32 <1.0
3rd Qtr 8/15/07 <1.0 <1.0 <1.0 <1.0 31 <1.0
4th Qtr 10/10/07 <1.0 <1.0 <1.0 <1.0 32 <1.0
1st Qtr 3/28/08 <1.0 <1.0 <1.0 <1.0 31 <1
2nd Qtr 6/25/08 <1.0 <1.0 <1.0 <1.0 29 <1.0
3rd Qtr 9/10/08 <1.0 <1.0 <1.0 <1.0 30 <1.0
4th Qtr 10/15/08 <1.0 <1.0 <1.0 <1.0 26 <0.05
1st Qtr 3/4/09 <1.0 <1.0 <1.0 <1.0 30 <1
2nd Qtr 6/23/09 <1.0 <1.0 <1.0 <1.0 31 <0.1
3rd Qtr 9/14/09 <1.0 <1.0 <1.0 <1.0 33 <0.1
4th Qtr 12/16/09 <1.0 <1.0 <1.0 <1.0 35 <0.1
1st Qtr 2/17/10 <1.0 <1.0 <1.0 <1.0 38 <0.1
2nd Qtr 6/14/10 <1.0 <1.0 <1.0 <1.0 32 <0.1
3rd Qtr 8/16/10 <1.0 <1.0 <1.0 <1.0 28 <0.1
4th Qtr 10/15/10 <1.0 <1.0 <1.0 <1.0 24 <0.1
1st Qtr 2/23/11 <1.0 <1.0 <1.0 <1.0 40 <0.1
2nd Qtr 5/25/11 <1.0 <1.0 <1.0 <1.0 31 <0.1
3rd Qtr 8/16/11 <1.0 <1.0 <1.0 <1.0 33 <0.1
4th Qtr 11/16/11 NA NA NA NA 32 <0.1
(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 <1.0 37.7 <0.1
4th Qtr 10/28/15 <1.0 <1.0 <1.0 <1.0 34.7 <0.1
1st Qtr 3/22/16 <1.0 <1.0 <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
3rd Qtr 8/8/17 <1.0 <1.0 <1.0 <1.0 38.1 <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
(10 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 m®
3rd Qtr 8/31/05 <10 2,900 <10 <10 NA 9.8
4th Qtr 12/7/05 <50 2,400 <50 <50 52 9.7
1st Qtr 3/9/06 <50 2,700 <50 <50 49 9.4
2nd Qtr 6/14/06 <50 2,200 <50 <50 48 9.6
3rd Qtr 7/20/06 <50 2,840 <50 <50 51
4th Qtr 11/8/06 1.4 2,260 <1.0 <1.0 47 9.2
1st Qtr 2/28/07 1.2 1,900 <1.0 <1.0 47 8.9
2nd Qtr 6/27/07 1.4 1,900 <1.0 <1.0 45 9
3rd Qtr 8/15/07 1.3 2,300 <1.0 <1.0 43 8.4
4th Qtr 10/10/07 1.3 2,000 <1.0 <1.0 43 7.8
1st Qtr 3/28/08 1.3 2,000 <1.6 <1.0 39 7.6
2nd Qtr 6/25/08 1.1 1,900 <1.0 <1.0 39 8.68
3rd Qtr 9/10/08 1.3 1,700 <1.0 <1.0 35 8.15
4th Qtr 10/15/08 1.3 1,700 <1.0 <1.0 41 9.3
1st Qtr 3/11/09 1.1 1,700 <1.6 <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 3/3/16 <1.0 1,300 <1.0 <1.0 35 7.1
2nd Qtr 6/14/10 1.2 1,600 <1.0 <1.0 40 6.8
3rd Qtr 8/18/10 1 1,600 <1.0 <1.0 35 6.7
4th Qtr 10/15/10 <1.0 1,500 <1.0 <1.0 40 6.6
1st Qtr 2/24/11 <1.0 1,300 <1.0 <1.0 41 6.6
2nd Qtr 6/1/11 <1.0 1,200 <1.0 <1.0 35 6.6
3rd Qtr 8/18/11 <1.0 1,300 <1.0 <1.0 36 6.8
4th Qtr 11/29/11 <1.0 . 1,500 <1.0 <1.0 40 6.6
(i jist Qtr 1/24/12 <1.0 1,300 <i.6 <1.0 38 6.8
2nd Qtr 6/14/12 <1.0 1,000 <1.0 <1.0 42 7.1
3rd Qtr 9/28/12 <1.0 1,000 <1.0 <1.0 39 5.0
4th Qtr 10/4/12 <1.0 1,100 <1.0 <1.0 40 6.5
1st Qtr 2/13/13 3.66 1,320 <1.0 <1.0 37.6 6.99
2nd Qtr 6/19/13 <1.0 1,100 <1.0 <1.0 39.1 6.87
3rd Qtr 9/3/13 <1.0 1,150 <1.0 <1.0 37.6 7.12
4th Qtr 11/14/13 <1.0 1,280 <1.0 <1.0 36.5 7.08
1st Qtr 2/5/14 5.47 1,090 <1.0 <1.0 38.9 7.74
2nd Qtr 5/23/14 4.77 1,020 <1.0 <1.0 37.4 6.93
3rd Qtr 8/27/14 <1.6 MS 1.4 <1.0 38 4.80
4th Qtr 10/29/14 <1.0 JJiP <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 1JM0 <1.0 <1.0 38.5 1.55
1st Qtr 3/9/16 <1.0 974 <1.0 <1.0 41.7 6.148
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 <1.0 442 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
3rd Qtr 7/26/17 <1.0 958 <1.0 <1.0 42.8 5.04
J1J_As of March_2£12_both_north and_south wild Nfejjonds no longer receiving water.
_£22.chlorofomi £umQin£_well_st£rtedjnJ/1_4n5_________
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
□USA 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)(S pg/L)No GWQS (mg/L) (10 mg/L)
7W4-2 (chloroform pumping
well starting 1/14/15)
1st Qtr 3/16/05 NA 3,700 NA NA NA 7.7
2nd Qtr 5/25/05 NA 3,750 NA NA NA 8.6
3rd Qtr 8/31/05 <10 3,900 <10 <10 NA 8.0
4th Qtr 12/7/05 <50 3,500 <50 <50 56 7.8
1st Qtr 3/9/06 <50 3,800 <50 <50 56 7.5
2nd Qtr 6/14/06 <50 3,200 <50 <50 56 7.1
3rd Qtr 7/20/06 <50 4,120 <50 <50 54 7.4
4th Qtr 11/8/06 2.3 3,420 <1.0 <1.0 55 7.6
1st Qtr 2/28/07 1.8 2,300 <1.0 <1.0 54 7.3
2nd Qtr 6/27/07 2.5 3,000 <1.0 <1.0 50 7.8
3rd Qtr 8/15/07 2.2 340 (?)<1.0 <1.0 49 7.3
4th Qtr 10/10/07 2.1 ...............3,200 <1.0 <1.0 51 6.9
1st Qtr 3/28/08 2.3 3,300 <1.0 <1.0 48 6.9
2nd Qtr 6/25/08 2.2 3,100 <1.0 <1.0 46 7.4
3rd Qtr 9/10/08 2.4 2,800 <1.0 <1.0 42 7.1
4th Qtr 10/15/08 NA NA NA NA 47 8.0
11/18/08 2.4 ..........3,200 <2.0 <2.0 NA NA
1st Qtr 3/11/09 2.2 3,100 <1.0 <1.0 46 6.5
2nd Qtr 6/23/09 2 2,800 <1.0 <1.0 44 6.4
3rd Qtr 9/14/09 2 3,000 <1.0 <1.0 43 6.6
4th Qtr 12/29/09 2 1,600 <1.0 <1.0 46 6.4
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 3J00 <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 3j580 <1.0 <1.0 45.5 8.45
(2)1 st Qtr 3/9/15 1.44 1,840 <1.0 <1.0 44.9 5.32
2nd Qtr 6/8/15 <1.0 1,650 <1.0 <1.0 48.1 4.3
3rd Qtr 8/31/15 <1.0 1,060 2.6 <1.0 50 3.76
4th Qtr 10/19/15 2.6 2J)7P <1.0 <1.0 41.9 5.18
1st Qtr 3/9/16 1.2 1,970 <1.0 <i.6 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 <1.6 43.1 4.74
2nd Qtr 6/13/17 <1.0 1,940 <1.0 <1.0 43.6 4.90
3rd Qtr 7/26/17 <1.0 -------------L310 <1.0 <1.0 43.2 5.08
_£1J_As of March_2012_both_north and^south wijd lifeponds no longer receiving water
J2J_chlorofomi £u m ^iri2_we l[sta rtedjn_J/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
DUSA White Mesa Mill
Well
Sampling Event
Parameter
(GWQS)
Carbon Tetrachloride
(5 ttg/L)
Chloroform
(70 yq/L)
Chloromethane
(30 yq/L)
Methylene Chloride
(5 yq/L)
Chloride
No GWQS (mq/L)
Nitrate, Nitrate + Nitrite
(10 mg/L)
TW4-3
1st Qtr 3/16/05 NA <1.0 NA NA NA 3.5
2nd Qtr 5/25/05 NA <1.0 NA NA NA 3.7
3rd Qtr 8/31/05 <1.0 <1.0 6.4 <1.0 NA 3.5
4th Qtr 12/7/05 <1.0 <1.0 <1.0 <1.0 26 3.3
1st Qtr 3/9/06 <1.0 <1.0 2.3 <1.0 26 3.3
2nd Qtr 6/14/06 <1.0 <1.0 1.6 <1.0 26 7.1
3rd Qtr 7/20/06 <1.0 <1.0 2.2 <1.0 26 2.9
4th Qtr 11/8/06 <1.0 <1.0 <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 2.8
4th Qtr 12/29/09 <1.0 <1.0 <1.0 <1.0 22 ...............2,6
1st Qtr 2/23/10 <1.0
<i.'6 <1.0 <1.0 23 2.8
2nd Qtr 6/14/10 <1.0 <1.0 <1.0 <1.0 24 3.0
3rd Qtr 8/10/10 <1.0 <1.0 <1.0 <1.0 22 3.1
4th Qtr 10/15/10 <1.0 <1.0 <1.0 <1.0 26 3.3
1st Qtr 2/15/11 <1.0 <1.0 <1.0 <1.0 23 3.5
2nd Qtr 5/25/11 <1.0 <1.0 <1.0 <1.0 23 3.7
3rd Qtr 8/16/11 <1.0 <1.0 <1.0 <1.0 23 4.0
4th Qtr 11/14/11 <1.0 <1.0 <1.0 <1.0 23 4.4
(1)1st Qtr 1/17/12 <1.0 <1.0 <1.0 <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 <1.0 23.7 5.05
2nd Qtr 6/29/13 <1.0 <1.0 <1.0 <1.0 23.8 5.83
3rd Qtr 9/3/13 <1.0 <1.0 <1.0 <1.0 25 4.90
4th Qtr 11/6/13 <1.0 <1.0 <1.0 <1.0 24.1 5.89
1st Qtr 1/22/14 <1.0 <1.0 <1.0 <1.0 24.9 6.66
2nd Qtr 5/21/14 <1.0 <1.0 <1.0 <1.0 24.4 6.01
3rd Qtr 8/13/14 <1.0 <1.0 <1.0 <1.0 26 5.30
4th Qtr 10/23/14 <1.0 <1.0 <1.0 <1.0 26.7 6.07
1st Qtr 3/11/15 <1.0 <1.0 <1.0 <1.0 26.2 6.64
2nd Qtr 6/10/15 <1.0 <1.0 <1.0 <1.0 27.5 5.71
Duplicate TW4-65 <1.0 <1.0 <1.0 <1.0 27.5 3.94
3rd Qtr 8/13/15 <1.0 <1.0 <1.0 <1.0 27.4 3.88
4th Qtr 10/21/15 <1.0 <1.0 <1.0 <1.0 „ 25,6 5.37
1st Qtr 3/15/16 <1.0 <1.0 <1.0 <1.0 32.8 5.83
2nd Qtr 5/25/16 <1.0 <1.0 <1.0 <1.0 27.9 5.65
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 6.36
3rd Qtr 7/27/17 <1.0 <1.0 <1.0 <1.0 28.5 6.36
Duplicate TW4-65 <1.0 <1.0 <1.0 <1.0 28.9 6.24
_£1J_As of March_2012_both_north and_south wild lifeponds nojonger receiving water.
NA = not analyzed
Shaded indicates concentrations exceeding GWQS.
TABLE 1 (7 of 29)
Historic Summary Of Monitoring Parameters Up To The 1st Quarter 2017
Chloroform Contamination Investigation
DUSA White Mesa Mill
Well
Sampling Event
Parameter
(GWQS)
Carbon Tetrachloride
(5 (ig/L)
Chloroform
(70 pg/L)
Chloromethane
(30Mg/L)
Methylene Chloride
(5 pg/L)
Chloride
No GWQS (mg/L)
Nitrate, Nitrate + Nitrite
(10 mg/L)
TW4-4 (chloroform pumping
well stared in 1st qtr 2010)
1st Qtr 3/16/05 NA 3,100 NA NA NA 10.0
2nd Qtr 5/25/05 NA 2,400 NA NA NA 11.3
3rd Qtr 8/31/05 <10 3,200 <10 <10 NA 9.9
4th Qtr 12/7/05 <50 2*800 <50 <50 54 10.2
1st Qtr 3/9/06 <50 2,900 <50 <50 51 9.5
2nd Qtr 6/14/06 <50 2.600 <50 <50 48 8.6
3rd Qtr 7/20/06 <50 2,850 <50 <50 50 9.7
4th Qtr 11/8/06 1.7 2*670 <1.0 <1.0 49 10.1
1st Qtr 2/28/07 1.5 2,200 <1.0 <1.0 49 9.0
2nd Qtr 6/27/07 1.7 2,400 <1.0 <1.0 47 9.4
3rd Qtr 8/15/07 1.5 2,700 <1.0 <1.0 45 9.5
4th Qtr 10/10/07 1.5 2*500 <1.0 <1.0 47 9.5
1st Qtr 3/28/08 1.6 2,800 <1.0 <1.0 43 9.2
2nd Qtr 6/25/08 1.5 2,500 <1.0 <1.0 42 10.8
3rd Qtr 9/10/08 1.4 2,200 <1.0 <1.0 39 8.8
4th Qtr 10/15/08 NA NA NA NA 44 10.1
4th Qtr 11/18/09 <2.0 2,500 <2.0 <2.0 NA NA
1st Qtr 3/4/09 1.2 2,200 <1.0 <1.0 37 10.2
2nd Qtr 6/23/09 1.2 1,800 <1.0 <1.0 34 8.2
3rd Qtr 9/14/09 1.1 2,000 <1.0 <1.0 39 8.4
4th Qtr 12/29/09 1.1 950 <1.0 <1.0 41 7.6
(2)1st Qtr 2/17/10 1 1,700 <1.0 <1.0 48 6.6
2nd Qtr 6/14/10 1.2 1,700 <1.0 <1.0 35 7.6
3rd Qtr 8/10/10 1.3 2,100 <1.0 <1.0 36 7.3
4th Qtr 10/15/10 1.3 1.700 <1.0 <1.0 38 7.1
1st Qtr 2/23/11 1.4 1,800 <1.0 <1.0 41 7.0
2nd Qtr 6/1/11 1.2 1,700 <1.0 <1.0 35 7.0
3rd Qtr 8/17/11 <1.0 1,500 <1.0 <1.0 40 6.6
4th Qtr 11/16/11 1 ...............1.500 <1.0 <1.0 39 7.0
(1)1st Qtr 1/23/12 <1.0 1,200 <1.0 <1.0 38 7.1
2nd Qtr 6/6/12 <1.0 1,500 <1.0 <1.0 43 7.1
3rd Qtr 9/4/12 1.2 1,600 <1.0 <1.0 39 7.1
4th Qtr 10/3/12 1 ............1.400 <1.0 <1.0 38 7.0
1st Qtr 2/11/13 1 1,460 <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 <1.6 <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 ......1,1.30 <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 1J90 <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
<1.0 ________jm <1.0 <1.0 40.5 6.47
_£1J_As of March_2012_both_north and_south wild lifeponds no longer receiving water
_[2j_Chloroform_£i£p£i^n£ well_sta redjnJ^st_qtr 2010)_____
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
(Spg/L)
Chloroform
(70 pg/L)
Chloromethane
(30 pg/L)
Methylene Chloride
(5 P9/L)
Chloride
No GWQS (mg/L)
Nitrate, Nitrate + Nitrite
(10 mg/L)
TW4-5
1st Qtr 3/16/05 NA 120 NA NA NA 4.9
2nd Qtr 5/25/05 NA 113 NA NA NA 3.7
3rd Qtr 8/31/05 <2.5 82 5.8 <2.5 NA 6.0
4th Qtr 12/7/05 <?5 63 2.5 <2.5 56 6.0
1st Qtr 3/9/06 <2.5 66 3.1 <2.5 52 6.0
2nd Qtr 6/14/06 <2.5 51 3.1 <2.5 51 5.9
3rd Qtr 7/20/06 <1.0 53.7 <1.0 <1.0 54 6.7
4th Qtr 11/8/06 <1.0 47.1 <1.0 <1.0 55 2.9
1st Qtr 2/28/07 <1.0 35 <1.0 <1.0 57 7.8
2nd Qtr 6/27/07 <1.0 26 <1.0 <1.0 45 7.0
3rd Qtr 8/15/07 <1.0 9.2 <1.0 <1.0 38 7.7
4th Qtr 10/10/07 <1.0 9.4 <1.0 <1.0 39 8.2
1st Qtr 3/28/08 <1.0 11 <1.0 <1.0 36 7.4
2nd Qtr 6/25/08 <1.0 9.3 <1.0 <1.0 37 8.7
3rd Qtr 9/10/08 <1.0 11 <1.0 <1.0 34 7.9
4th Qtr 10/15/08 <1.0 10 <1.0 <1.0 37 9.3
1st Qtr 3/4/09 <1.0 12 <1.0 <1.0 34 7.9
2nd Qtr 6/23/09 <1.0 13 <1.0 <1.0 37 7.5
3rd Qtr 9/14/09 <1.0 12 <1.0 <1.0 48 8.3
4th Qtr 12/29/09 <1.0 8.5 <1.0 <1.0 41 7.5
1st Qtr 2/25/10 <1.0 13 <1.0 <1.0 43 6.8
2nd Qtr 6/14/10 <1.0 12 <1.0 <1.0 28 7.1
3rd Qtr 8/11/10 <1.0 12 <1.0 <1.0 38 7.0
4th Qtr 10/15/10 <1.0 11 <1.0 <1.0 41 7.2
1st Qtr 2/22/11 <1.0 10 <1.0 <1.0 34 7.0
2nd Qtr 5/26/11 <1.0 9 <1.0 <1.0 35 7.2
3rd Qtr 8/7/11 <1.0 10 <1.0 <1.0 37 7.5
4th Qtr 11/16/11 NA NA NA NA 30 6.0
^ 12/7/11 <1.0 7.9 <1.0 <1.0 NA NA
(2)1st Qtr 1/18/12 <1.0 7.6 <1.0 <1.0 22 5.8
2nd Qtr 6/6/12 <1.0 8.4 <1.0 <1.0 39 8.0
3rd Qtr 9/11/12 <1.0 12.0 <1.0 <1.0 37 8.1
4th Qtr 10/3/12 <1.0 8.0 <1.0 <1.0 38 7.7
1st Qtr 2/13/13 <1.0 10.8 <1.0 <1.0 34.3 8.24
2nd Qtr 6/13/13 <1.0 11.2 <1.0 <1.0 36.5 10.70
3rd Qtr 9/5/13 <1.0 11.6 <1.0 <1.0 39.1 7.79
4th Qtr 11/13/13 <1.0 14.4 <1.0 <1.0 41.1 7.75
1st Qtr 1/30/14 <1.0 12.5 <1.0 <1.0 40.5 9.16
2nd Qtr 5/22/14 <1.0 13.4 <1.0 <1.0 51.4 7.78
3rd Qtr 8/14/14 <1.0 12.0 <1.0 <1.0 44 7.2
4th Qtr 11/13/14 <1.0 14.6 <1.0 <1.0 45.1 8.31
1st Qtr 3/12/15 <1.0 13.8 <1.0 <1.0 45.1 9.32
Duplicate TW4-70 <1.0 13.8 <1.0 <1.0 46.4 8.81
2nd Qtr 6/10/15 <1.0 13.3 1.07 <1.0 47.3 7.08
3rd Qtr 9/3/15 <1.0 12.9 <1.0 <1.0 52.2 8.1
4th Qtr 10/28/15 <1.0 11.0 <1.0 <1.0 43.6 8.03
1st Qtr 3/17/16 <1.0 11.0 <1.0 <1.0 44.7 10.2
2nd Qtr 5/23/16 <1.0 13.6 <1.0 <1.0 45.9 8.98
3rd Qtr 8/3/16 <1.0 10.8 <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 <1.0 <1.0 44.7 8.49
2nd Qtr 6/15/17 <1.0 14.6 <1.0 <1.0 47.3 8.52
3rd Qtr 8/8/17 <1.0 14.6 <1.0 <1.0 48.6 8.52
(1) VOCs were resampled because laboratory missed holding time.pj_As of Majoh_2012_both_north and_south wijd Ijfejjonds noJonger receiving 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
(Sufl/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)
TW4-6
1st Qtr 3/16/05 NA <1.0 NA NA NA 0.2
2nd Qtr 5/25/05 NA 2.5 NA NA NA 0.4
3rd Qtr 8/31/05 <1.0 10 2.8 <1.0 NA 0.8
4th Qtr 12/7/05 <1.0 17 1.3 <1.0 32 0.9
1st Qtr 3/9/06 <1.0 31 <1.0 <1.0 31 1.2
2nd Qtr 6/14/06 <1.0 19 <1.0 <1.0 30 1.0
3rd Qtr 7/20/06 <1.0 11 <1.0 <1.0 37 0.6
4th Qtr 11/8/06 <1.0 42.8 <1.0 <1.0 65 1.4
1st Qtr 2/28/07 <1.0 46 <1.0 <1.0 32 1.8
2nd Qtr 6/27/07 <1.0 11 <1.0 <1.0 38 0.6
3rd Qtr 8/15/07 <1.0 18 <1.0 <1.0 36 0.7
4th Qtr 10/10/07 <1.0 18 <1.0 <1.0 35 0.8
1st Qtr 3/28/08 <1.0 52 <1.0 <1.0 33 1.1
2nd Qtr 6/25/08 <1.0 24 <1.0 <1.0 35 0.9
3rd Qtr 9/10/08 <1.0 39 <1.0 <1.0 35 1.1
4th Qtr 10/15/08 <1.0 37 <1.0 <1.0 33 1.0
1st Qtr 3/11/09 <1.0 81 <1.0 <1.0 35 2.2
2nd Qtr 6/23/09 <1.0 120 <1.0 <1.0 37 2.7
3rd Qtr 9/14/09 <1.0 280 <1.0 <1.6 37 5.0
4th Qtr 12/29/09 <1.0 ________-250.<10 <1.0 41 6.1
(5)1 st Qtr 2/25/10 <1.0 1000 <1.0 <1.0 45 1.8
2nd Qtr 6/14/10 <1.0 590 <1.0 <1.0 33 2.5
3rd Qtr 8/11/10 <1.0 630 <1.0 <1.0 31 3.9
4th Qtr 10/15/10 <1.0 420 <1.0 <1.0 41 4.3
1st Qtr 2/23/11 <1.0 47 <1.0 <1.0 40 0.7
2nd Qtr 5/26/11 <1.0 9.6 <1.0 <1.0 42 0.3
3rd Qtr 8/17/11 <1.0 16 <1.0 <1.0 39 0.3
4th Qtr 11/16/11 NA NA NA NA 36 0.8
(1) 12/7/11 <1.0 21 <1.0 <1.0 NA NA
(2) 11/16/11 <1.0 50 <1.0 <1.0 33 0.8
(4)1st Qtr 1/18/12 <1.0 38 <1.0 <1.0 38 0.7
2nd Qtr 6/13/12 <1.0 4.7 <1.0 <1.0 40 0.2
3rd Qtr 9/11/12 <1.0 6.9 <1.0 <1.0 21 0.1
4th Qtr 10/3/12 <1.0 9 <1.0 <1.0 41 0.2
1st Qtr 2/13/13 <1.0 6.89 <1.0 <1.0 40.4 0.2
2nd Qtr 6/13/13 <1.0 4.86 <1.0 <1.0 37.9 0.2
3rd Qtr 9/5/13 <1.0 5.93 <1.0 <1.0 40.6 0.2
4th Qtr 11/13/13 <1.0 5.51 <1.0 <1.0 40.2 1.5
1st Qtr 1/29/14 <1.0 57 <1.0 <1.0 40.6 0.2
2nd Qtr 5/22/14 <1.0 10.3 <1.0 <1.0 37 0.3
3rd Qtr 8/14/14 <1.0 202 <1.0 <1.0 40 4.2
(3)3rd Qtr 9/24/14 <1.0 ?80 <1.0 <1.0 NA NA
4th Qtr 10/29/14 <1.0 723 <1.0 <1.0 41.1 6.9
1st Qtr 3/12/15 <1.0 1,180 <1.0 <1.0 41.2 5.3
2nd Qtr 6/10/15 <1.0 1,040 <1.0 <1.0 41.6 5.9
3rd Qtr 9/10/15 <1.0 1,040 <1.0 <1.0 47 6.8
4th Qtr 10/29/15 <1.0 843 <1.0 <1.0 40.2 5.6
1st Qtr 3/22/16 <1.0 834 <1.0 <1.0 42.3 6.79
2nd Qtr 6/8/16 <1.0 486 <1.0 <1.0 44.1 3.19
3rd Qtr 7/27/16 <1.0 433 <1.0 <1.0 42.2 3.85
4th Qtr 10/26/16 <1.0 THE]<1.0 <1.0 46.1 3.74
1st Qtr 3/16/17 <1.0 288 <1.0 <1.0 42.1 3.15
2nd Qtr 6/21/17 <1.0 239 <1.0 <1.0 42.6 2.42
<1.0 129 <1.0 <1.0 42.9 1.71
(1) VOCs were resampled because laboratory missed holding time
(2) Results of the TW4-70 the duplicate sample for TW4-6.
(3) Reanalyzed for VOCs only.
J4J_As of March_20_12_both_north and_south wild lifejsonds noJonger receiving water
^Chlorojorm^um^ well TW4-4 located appoximately Sstared in 1st qtr 2010)
NA = not analyzed
Shaded indicates concentrations exceeding GWQS.
TABLE 1 (10 of 29)
Historic Summary Of Monitoring Parameters Up To The 1st Quarter 2017
Chloroform Contamination Investigation
DUSA White Mesa Mill
Well
Sampling Event
Parameter
___(GWQS)
Carbon Tetrachloride
(5pg/L)
Chloroform
(70 pg/L)
Chloromethane
(30 pg/L)
Methylene Chloride
(5 pg/L)
Chloride
No GWQS <mq/L)
Nitrate, Nitrate + Nitrite
(10 mg/L)
TW4-7
1st Qtr 3/16/05 NA 3,100 NA NA NA 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 <1.6 <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 <1.6 940 <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 1jP50 <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
1st Qtr 3/22/16 <1.0 834 <1.0 <1.0 42.4 4.43
2nd Qtr 6/8/16 <1.0 909 <1.0 <1.0 44.1 3.75
3rd Qtr 8/4/16 <1.0 1,000 <1.0 <1.0 42.3 4.21
4th Qtr 10/26/16 <1.0 886 <1.0 <1.0 45.8 4.33
1st Qtr 3/21/17 <1.6 986 <1.0 <1.0 40.5 3.87
2nd Qtr 6/21/17 <1.0 968 <1.0 <1.0 43.3 4.15
3rd Qtr 8/4/17 <1.0 1.070 <1.0 <1.0 44.7 4.20
^1J_As of March_2012_both_north and_south wild Nfejjonds noJonger^receiving water
NA = not analyzed
Shaded indicates concentrations exceeding GWQS.
Bold and italics indicates the MDL exceeded the GWQS.
TABLE 1 (11 of 29)
Historic Summary Of Monitoring Parameters Up To The 1st Quarter 2017
Chloroform Contamination Investigation
DUSA White Mesa Mill
Well
Sampling Event
Parameter
(GWQS)
Carbon Tetrachloride
(5 gfl/L)
Chloroform
(70 uq/L)
Chloromethane
(30 gq/L)
Methylene Chloride
(5 uq/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 <1.0 <1.0 <1.0 39 <0.05
4th Qtr 10/15/08 <1.0 <1.0 <1.0 <1.0 44 <0.05
1st Qtr 3/4/09 <1.0 <1.0 <1.0 <1.0 42 <0.1
2nd Qtr 6/23/09 <1.0 <1.0 <1.0 <1.0 44 <0.1
3rd Qtr 9/14/09 <1.0 <1.0 <1.0 <1.0 44 <0.1
4th Qtr 12/17/09 <1.0 <1.0 <1.0 <1.0 51 <0.1
1st Qtr 2/24/10 <1.0 <1.0 <1.0 <1.0 57 <0.1
2nd Qtr 6/14/10 <1.0 <1.0 <1.0 <1.0 42 <0.1
3rd Qtr 8/18/10 <1.0 <1.0 <1.0 <1.0 45 <0.1
4th Qtr 10/15/10 <1.0 l<T.o <1.0 <1.0 46 0.1
1st Qtr 2/16/11 <1.0 <1.0 <1.0 <1.6 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 0.3
2nd Qtr 5/13/12 <1.0 <1.0 <1.0 <1.0 44 0.2
3rd Qtr 8/29/12 <1.0 <1.0 <1.0 <1.0 48 0.1
4th Qtr 10/3/12 <1.0 <1.0 <1.0 <1.0 47 <0.1
1st Qtr 2/7/13 <1.0 <1.0 <1.6 <1.0 46.6 0.41
2nd Qtr 5/30/13 <1.0 <1.0 <1.0 <1.0 45.5 <0.1
3rd Qtr 9/5/13 <1.0 <1.0 <1.0 <1.0 47.5 0.1
4th Qtr 11/7/13 <1.0 <1.0 <1.0 <1.0 46.1 <0.1
1st Qtr 1/23/14 <i.o 63.8 <1.0 <1.0 48.5 0.166
(a2/6/2014 <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 <1.0 901 <1.0 <1.0 53 1.88
3rd Qtr 9/10/15 <1.0 747 <1.0 <1.0 59.6 1.96
4th Qtr 10/29/15 <1.0 770 <1.0 <1.0 52 2.2
1st Qtr 3/17/16 <1.0 634 <1.0 <i.6 54.2 2.48
2nd Qtr 6/8/16 <1.0 595 <1.0 <1.0 58.7 2.14
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 57.4 206
2nd Qtr 6/21/17 <1.0 256 <1.0 <1.0 58.8 1.97
3rd Qtr 8/4/17 <1.0 ----------------223 <1.0 <1.0 61.2 1.64
(1) VOCs were resampled because laboratory missed holding time.
(2) Resampled to verify chloroform concentration that was collected on 1/23/14.
J3)_As of Warch2012_ both_ north and_s_outh wild lifejjonds nojonger receiving water
NA = not analyzed
Shaded indicates concentrations ig GWQS.
TABLE 1 (12 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)19/1)
Chloromethane
(30 pg/L)
Methylene Chloride
(5pg/L)
Chloride
No GWQS (mg/L)
Nitrate, Nitrate + Nitrite
(10 mg/L)
TW4-9
1st Qtr 3/16/05 NA 3.8 NA NA NA 1.3
2nd Qtr 5/25/05 NA 1.2 NA NA NA 1.3
3rd Qtr 8/31/05 <1.0 <1.0 2.9 <1.0 NA 1.3
4th Qtr 12/7/05 <1.0 <1.0 <1.0 <1.0 42 1.3
1st Qtr 3/9/06 <1.0 <1.0 2.6 <1.6 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 <1.0 <1.0 30 2.3
3rd Qtr 9/14/09 <1.0 <1.0 <1.0 <1.0 30 2.5
4th Qtr 12/17/09 <1.0 <1.0 <1.0 <1.0 37 1.7
1st Qtr 2/23/10 <1.0 <1.0 <1.0 <1.0 47 1.4
2nd Qtr 6/14/10 <1.0 <1.0 <1.0 <1.0 33 1.5
3rd Qtr 8/13/10 <1.0 <1.0 <1.0 <1.0 40 1.2
4th Qtr 10/15/10 <1.0 <1.0 <1.0 <1.0 34 1.8
1st Qtr 2/17/11 <1.6 <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 <1.0 <1.6 28 2.3
2nd Qtr 5/31/12 <1.0 <1.0 <1.0 <1.0 23 4.0
3rd Qtr 8/30/12 <1.0 <1.0 <1.0 <1.0 22 3.9
4th Qtr 10/3/12 <1.0 <1.0 <1.0 <1.0 21 3.8
1st Qtr 2/7/13 <1.0 <1.0 <1.0
<1.6 20.6 4.49
2nd Qtr 5/30/13 <1.0 <1.0 <1.0 <1.0 21.4 4.49
3rd Qtr 9/5/13 <1.0 <1.0 <1.0 <1.0 22.7 4.03
4th Qtr 11/7/13 <1.0 <1.0 <1.0 <1.0 23.6 4.87
1st Qtr 1/29/14 <1.0 <1.0 <1.0 <1.0 22 4.36
2nd Qtr 5/22/14 <1.0 6.9 <1.0 <1.0 24 3.44
3rd Qtr 8/14/14 <1.0 47 <1.0 <1.0 27 2.7
4th Qtr 10/29/14 <1.0 101 <1.0 <1.0 25 4.29
1st Qtr 3/12/15 <1.0 53.5 <1.0 <1.0 29.5 3.28
2nd Qtr 6/11/15 <1.0 35.1 <1.0 <1.0 35.3 1.83
3rd Qtr 9/3/15 <1.0 48 <1.0 <1.0 39.3 1.44
4th Qtr 10/28/15 <1.0 68.4 <1.0 <1.0 29.2 2.89
1st Qtr 3/17/16 <1.0 74.3 <1.0 <1.0 33.6 2.51
2nd Qtr 6/8/16 <1.0 76.2 <1.0 <1.0 35.1 2.16
3rd Qtr 8/3/16 <1.0 76.8 <1.0 <1.0 33.6 2.11
4th Qtr 10/26/16 <1.0 76.0 <1.0 <1.0 37.4 2.24
1st Qtr 3/17/17 <1.6 113 <1.0 <1.0 34.5 2.18
2nd Qtr 6/21/17 <1.0 113 <1.0 <1.0 35.9 1.92
3rd Qtr 8/3/17 <1.0 118 <1.0 <1.0 37 1.90
(1) VOCs were resampled because laboratory missed holding timej2]_As of Majch_2012_both_north and_s_outh wild lifej)ond_s no jonger receiving 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 M9/L)
Chloroform
(70 M9/L)
Chloromethane
(30 (jg/L)
Methylene Chloride
(5 pg/L)
Chloride
No GWQS (mq/L)
Nitrate, Nitrate + Nitrite
(10 mg/L)
TW4-10
1st Qtr 3/16/05 NA 140 NA NA NA 1.6
2nd Qtr 5/25/05 NA 62 NA NA NA 0.8
3rd Qtr 8/31/05 <2.5 110 6.2 <2.5 NA 1.1
4th Qtr 12/7/05 <2.5 300 <2.5 <2.5 52 3.3
1st Qtr 3/9/06 <5.0 190 <5.0 <5.0 50 2.4
2nd Qtr 6/14/06 <5.0 300 <5.0 <5.0 54 3.5
3rd Qtr 7/20/06 <5.0 504 <5.0 <5.0 61 6.8
4th Qtr 11/8/06 <1.0 452 -1.6 <1.0 58 5.7
1st Qtr 2/28/07 <1.0 500 <1.0 <1.6 2 7.3
2nd Qtr 6/27/07 <1.0 350 <1.0 <1.0 54 5.1
3rd Qtr 8/15/07 <1.0 660 <1.0 <1.0 59 7.3
4th Qtr 10/10/07 <1.0 470 <1.0 <1.0 59 6.7
1st Qtr 3/28/08 <1.0 620 <1.0 <1.0 55 7.3
2nd Qtr 6/25/08 <1.0 720 <1.0 <1.0 58 9.9
3rd Qtr 9/10/08 <1.0 660 <1.0 <1.0 51 9.23
4th Qtr 10/15/08 NA NA NA NA 61 10.5
11/18/08 <2.0 1,200 <2.0 <2.0 NA NA
1st Qtr 3/11/09 <1.0 1,100 <1.0 <1.0 64 11.6
2nd Qtr 6/23/09 <1.0 1,200 <1.0 <1.0 62 9.8
3rd Qtr 9/14/09 <1.0 910 <1.0 <1.0 51 8.1
4th Qtr 12/22/09 <1.0 300 <1.0 <1.0 51 3.8
1st Qtr 3/3/10 <1.0 460 <1.0 <1.0 48 5.0
2nd Qtr 6/14/10 <1.0 220 <1.0 <1.0 42 1.6
3rd Qtr 8/12/10 <1.0 100 <1.0 <1.0 38 0.8
4th Qtr 10/15/10 <1.0 1,100 <1.0 <1.0 52 .........................................1.1,Q
1st Qtr 2/23/11 <1.0 620 <1.0 <1.0 32 9.0
2nd Qtr 6/14/11 <1.0 280 <1.0 <1.0 42 3.3
3rd Qtr 8/17/11 <1.0 180 <1.0 <1.0 41 1.9
4th Qtr 11/16/11 <1.0 110 <1.0 <1.0 45 1.1
(1)1st Qtr 1/19/12 <1.0 76 <1.0 <1.0 40 0.9
2nd Qtr 6/14/12 <1.0 79 <1.0 <1.0 46 0.8
3rd Qtr 9/12/12 <1.0 130 <1.0 <1.0 44 1.0
4th Qtr 10/3/12 <1.0 140 <1.0 <1.0 45 1.6
1st Qtr 2/13/13 <1.0 154 <1.0 <1.0 49.1 1.2
2nd Qtr 6/13/13 <1.0 486 <1.0 <1.0 51.5 5.6
3rd Qtr 9/12/13 <1.0 1,126 <1.0 <1.0 67.9 13.0
4th Qtr 11/14/13 <1.0 ...............L380 <1.0 <1.0 70.9 .........................................1.6,0
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 ..................1.3,2
1st Qtr 3/18/15 <1.0 1,210 <1.0 <1.0 78.6 15.0
2nd Qtr 6/11/15 <1.0 1,240 <1.0 <1.0 75 11.4
3rd Qtr 9/10/15 <1.0 1,280 <1.0 <1.0 89.5 14.0
4th Qtr 10/29/15 <1.0 .... L350 <1.0 <1.0 79.9 13.5
1st Qtr 3/22/16 <1.0 1,430 <1.0 <1.0 84 1 17.3
2nd Qtr 6/8/16 <1.0 1,510 <1.0 <1.0 89.5 14.9
3rd Qtr 8/4/16 <1.0 1j500 <1.0 <1.0 85.3 14.9
4th Qtr 10/26/16 <1.0 1,290 <1.0 <1.0 84.4 .........................................1.4,8
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
3rd Qtr 8/4/17 <1.0 ..........umi <1.0 <1.0 77
_£1J_As of March_2012_both_north and_south wild Nfejjonds noJonger receiving water.
NA = not analyzed
Shaded indicates concentrations exceeding GWQS.
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 pg/L)
Chloroform
(70 Mg/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 <1.0 63 7.7
2nd Qtr 6/25/08 <1.0 640 <1.0 <1.0 46 7.3
3rd Qtr 9/10/08 <1.0 900 <1.0 <1.0 42 7.9
4th Qtr 10/15/08 NA NA NA NA 47 9.5
! 11/18/08 <2.0 1,000 <2.0 <2.0 NA NA
1st Qtr 3/11/09 <1.6 1,000 <1.0 <1.6 49 7.3
2nd Qtr 6/23/09 <1.0 980 <1.0 <1.0 44 6.8
3rd Qtr 9/14/09 <1.0 1,000 <1.0 <1.0 49 7.0
4th Qtr 12/29/09 <1.0 860 <1.0 <1.0 46 6.6
1st Qtr 3/3/10 <1.0 820 <1.0 <1.0 42 6.8
2nd Qtr 6/14/10 <1.0 820 <1.0 <1.0 40 6.9
3rd Qtr 8/12/10 <1.0 800 <1.0 <1.0 43 6.7
4th Qtr 10/15/10 <1.0 720 <1.0 <1.0 49 6.4
1st Qtr 2/23/11 <1.0 1,000 <1.0 <1.6 46 6.5
2nd Qtr 6/1/11 <1.0 930 <1.0 <1.0 49 7.3
3rd Qtr 8/17/11 <1.0 820 <1.0 <1.6 48 7.1
4th Qtr 11/16/11 <1.0 1500 <1.0 <1.0 46 7.1
(1)1 St Qtr 1/24/12 <1.0 610 <1.0 <1.0 43 6.8
2nd Qtr 6/13/12 <1.0 660 <1.0 <1.0 52 6.7
3rd Qtr 9/13/12 <1.0 740 <1.0 <1.0 49 3.0
4th Qtr 10/3/12 <1.0 730 <1.0 <1.0 50 7.0
1st Qtr 2/13/13 3.23 867 <1.0 <1.0 47.3 6.8
2nd Qtr 6/18/13 <1.0 788 <1.0 <1.0 49.3 7.4
3rd Qtr 9/12/13 <1.0 865 <1.6 <1.0 46.6 7.8
4th Qtr 11/13/13 <1.0 874 <1.0 <1.0 46.7 8.01
1st Qtr 2/5/14 5.19 785 <1.0 <1.6 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
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
3rd Qtr 7/26/17 1.81 3,290 <1.0 <1.0 51 7.78
_£IJ_As of March_2012_both_north and_south wild lifejDonds no longer receiving water.
j2J_Chloroform_gi£i£in£ well_startedj n 4/15___________
NA = not analyzed
Bold and italics indicates the MDL exceeded the GWQS.
Bold and italics indicates the MDL exceeded the GWQS.
TABLE 1 (15 of 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 <1.0 16 1.6
2nd Qtr 6/25/08 <1.0 <1.0 <1.0 <1.0 19 2.7
3rd Qtr 9/10/08 <1.0 <1.0 <1.0 <1.0 18 2.7
4th Qtr 10/15/08 <1.0 <1.0 <1.0 <1.0 22 2.5
1st Qtr 3/11/09 <1.0 <1.0 <1.0 <1.0 23 2.4
2nd Qtr 6/23/09 <1.0 <1.0 <1.0 <1.0 22 3.8
3rd Qtr 9/14/09 <1.0 <1.0 <1.0 <1.0 22 5.1
4th Qtr 12/16/09 <1.0 <1.0 <1.0 <1.0 23 ......3,6
1st Qtr 2/23/10 <1.0 <1.0 <1.0 <1.6 22 4.0
2nd Qtr 6/14/10 <1.0 <1.0 <1.0 <1.0 29 iij
3rd Qtr 8/10/10 <1.0 <1.0 <1.0 <1.0 35 9.0
4th Qtr 10/15/10 <1.0 <1.0 <1.0 <1.0 31 8.0
1st Qtr 2/15/11 <1.0 <1.0 <1.0 <1.0 31 6.5
2nd Qtr 5/25/11 <1.0 <1.0 <1.0 <1.0 32 7.0
3rd Qtr 8/16/11 <1.0 <1.0 <1.0 <1.0 31 6.8
4th Qtr 11/15/11 <1.0 <1.0 <1.0 <1.0 30 8.0
(1)1st Qtr 1/17/12 <1.0 <1.0 <1.0 <1.6 28 7.7
2nd Qtr 5/31/12 <1.0 <1.0 <1.0 <1.0 34 10.0
3rd Qtr 8/29/12 <1.0 <1.0 <1.0 <1.0 39 13.0
4th Qtr 10/3/12 <1.0 <1.0 <1.0 <1.0 39 13.0
1st Qtr 2/13/13 <1.0 <1.0 <1,0 <1.6 36.7 12.6
2nd Qtr 5/29/13 <1.0 <1.0 <1.0 <1.0 38.6 14.2
3rd Qtr 8/29/13 <1.0 <1.0 <1.0 <1.0 41.7 17.4
4th Qtr 11/6/13 <1.0 <1.0 <1,0.........................<1.0 41.4 .................. ...........16,4
1st Qtr 1/22/14 <1.0 <1.0 <1.0 <1.0 41.6 18.4
2nd Qtr 5/21/14 <1.0 <1.0 <1.0 <1.0 40.2 ......................................1.7/6
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 10.1
1st Qtr 3/11/15 <1.0 <1.0 <1.0 <1.0 50.6 ......................My?
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 ....................................m2nd 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 <1.0 <1.0 <1.0 <1.6 62.6 ........................................25.9
2nd Qtr 6/14/17 <1.0 1.25 <1.0 <1.0 67.2 29.9
3rd Qtr 8/2/17 <1.0 1.2 <1.0 <1.0 65.3 25.1
Deplicate TW4-70 <10 1.19 <1.0 <1.0 67 26.7
J1]_As of March_2012_bo1h_north and_south wild ljif_e_gonds nojonger receiving 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
DUSA White Mesa Mill
Well
Sampling Event
Parameter
(GWQS)
Carbon Tetrachloride
(Spg/L)
Chloroform
(70Mg/L)
Chloromethane
(30 pg/L)
Methylene Chloride
(5 pg/L)
Chloride
No GWQS (mg/L)
Nitrate, Nitrate + Nitrite
(10 mg/L)
TW4-13
1st Qtr 3/16/05 NA <1.0 NA NA NA 4.2
2nd Qtr 5/25/05 NA <1.0 NA NA NA 4.3
3rd Qtr 8/31/05 <1.0 <1.0 3.1 <1.0 NA 4.6
4th Qtr 12/7/05 <1.0 <1.0 <1.0 <1.0 69 4.3
1st Qtr 3/9/06 <1.0 <1.0 1.7 <1.0 67 4.2
2nd Qtr 6/14/06 <1.0 <1.0 1.4 <1.0 66 4.9
3rd Qtr 7/20/06 <1.0 <1.0 <1.0 <1.0 65 4.3
4th Qtr 11/8/06 <1.0 <1.0 <1.0 <1.0 33 0.8
1st Qtr 2/28/07 <1.0 <1.0 <1.0 <1.0 59 4.0
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 <1.0 <1.0 <1.0 <1.0 60 5.5
2nd Qtr 5/25/11 <1.0 <1.0 <1.0 <1.0 56 6.4
3rd Qtr 8/16/11 <1.0 <1.0 <1.0 <1.0 60 5.2
4th Qtr 11/15/11 <1.0 <1.0 <1.0 <1.0 54 5.9
(1)1st Qtr 1/17/12 <1.0 <1.0 <1.0 <1.0 55 5.5
2nd Qtr 5/31/12 <1.0 <1.0 <1.0 <1.0 59 6.0
3rd Qtr 8/29/12 <1.0 <1.0 <1.0 <1.0 60 6.2
4th Qtr 10/3/12 <1.0 <1.0 <1.0 <1.0 ........60 5.9
1st Qtr 2/13/13 <1.0 <1.0 <1.0 <1.0 59.3 6.31
2nd Qtr 5/29/13 <1.0 <1.0 <1.0 <1.0 56 6.8
3rd Qtr 8/29/13 <1.0 <1.0 <1.0 <1.0 63.5 7.16
4th Qtr 11/6/13 <1.0 <1.0 <1.0 <1.0 58.5 6.48
1st Qtr 1/22/14 <1.0 <1.0 <1.0 <1.0 63.1 7.09
2nd Qtr 5/21/14 <1.0 <1.0 <1.0 <1.0 56.1 5.99
3rd Qtr 8/13/14 <1.0 <1.0 <1.0 <1.0 62 4.8
4th Qtr 10/23/14 <1.0 <1.0 <1.0 <1.0 66.1 6.28
1st Qtr 3/11/15 <1.0 <1.0 <1.0 <1.0 66.4 7.09
2nd Qtr 6/10/15 <1.0 <1.0 <1.0 <1.0 70.3 6.32
3rd Qtr 9/2/15 <1.0 <1.0 <1.0 <1.0 76.5 5.7
4th Qtr 10/21/15 <1.0 <1.0 <1.0 <1.0 65.5 5.78
1st Qtr 3/16/16 <1.0 <1.0 <1.0 <1.0 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 <1.6 <1.0 66.0 6.05
2nd Qtr 6/15/17 <1.0 <1.0 <1.0 <1.0 70.4 6.49
3rd Qtr 8/2/17 <1.0 <1.0 <1.0 <1.0 70.5 6.15
_£1JiAs of March_2012_ both_ north and_south wild Nfeponds no Jonger receiving water
NA = not analyzed
Shaded indicates concentrations exceeding GWQS.
TABLE 1 (17 of 29)
Historic Summary Of Monitoring Parameters Up To The 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)
TW4-14
1st Qtr 3/16/05 NS NS NS NS NS NS
2nd Qtr 5/25/05 NS NS NS NS NS NS
3rd Qtr 8/31/05 NS NS NS NS NS NS
4th Qtr 12/7/05 NS NS NS NS NS NS
1st Qtr 3/9/06 NS NS NS NS NS NS
2nd Qtr 6/14/06 NS NS NS NS NS NS
3rd Qtr 7/20/06 NS NS NS NS NS NS
4th Qtr 11/8/06 <1.0 NS <1.0 <1.0 37 2.4
1st Qtr 2/28/07 <1.0 <1.0 <1.0 <1.0 38 2.3
2nd Qtr 6/27/07 <1.0 <1.0 <1.0 <1.0 38 1.4
3rd Qtr 8/15/07 <1.0 <1.0 <1.0 <1.0 36 1.1
4th Qtr 10/10/07 <1.0 <1.0 <1.0 <1.0 38 0.8
1st Qtr 3/28/08 <1.0 <1.0 <1.0 <1.0 57 0.4
2nd Qtr 6/25/08 <1.0 <1.0 <1.0 <1.0 35 1.6
3rd Qtr 9/10/08 <1.0 <1.0 <1.0 <1.0 34 1.38
4th Qtr 10/15/08 <1.0 <1.0 <1.0 <1.0 40 0.76
1st Qtr 3/4/09 <1.0 <1.0 <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
(ijlst Qtr 1/17/12 <i.6 <1.0 <1.0 <i.6 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
ist Qtr 2/7/13 <1.6 <1.0 <1.0 <1.0 35.2 4.6
2nd Qtr 5/29/13 <1.0 <1.0 <1.0 <1.0 38.6 4.4
3rd Qtr 8/29/13 <1.0 <1.0 <1.0 <1.0 37.6 4.51
4th Qtr 11/6/13 <1.0 <1.0 <1.0 <1.0 36.5 4.81
1st Qtr 1/22/14 <1.0 <1.6 <i.6 <1.0 35.5 5.92
2nd Qtr 5/21/14 <1.0 <1.0 <1.0 <1.0 32.5 4.87
3rd Qtr 8/13/14 <1.0 <1.0 <1.0 <1.0 38 4.1
4th Qtr 10/23/14 <1.0 <1.0 <1.0 <1.0 38.9 5.22
1st Qtr 3/12/15 <1.0 1.7 <1.0 <1.0 40.1 5.22
2nd Qtr 6/10/15 <1.0 1.82 <1.0 <1.0 41.8 3.55
3rd Qtr 9/3/15 <1.0 <1.0 <1.0 <1.0 42.4 2.77
4th Qtr 10/23/15 <1.0 1.46 <1.0 <1.0 40.6 2.45
1st Qtr 3/16/16 <1.0 4.49 <1.0 2.18 42.4 2.94
2nd Qtr 5/26/16 <1.0 6.15 <1.0 3.18 43.6 2.45
3rd Qtr 8/3/16 <1.0 5 <1.0 1.8 42.4 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
3rd Qtr 8/2/17 6.14 <1.0 <1.0 46.4 4.84
(1) Asof March 2012 both north and south wild life pond:s no longer 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
(S pg/L)
Chloroform
(70 M9/L)
Chloromethane
(30 Mfl/L)
Methylene Chloride
(5 Ufl/L)
Chloride
No GWQS (mg/L)
Nitrate, Nitrate + Nitrite
(10 mg/L)
TW4-16
1st Qtr 3/16/05 NA 240 NA NA NA <0.1
2nd Qtr 5/25/05 NA 212 NA NA NA <0.1
3rd Qtr 8/31/05 <1.0 85 3.2 48 NA <0.1
4th Qtr 12/7/05 <1 0 14 2 6 5.9 64 1.4
1st Qtr 3/9/06 <1.0 39 1.1 21 60 3
2nd Qtr 6/14/06 <1.0 13 2.4 8.9 55 1.9
3rd Qtr 7/20/06 <1.0 5.2 <1.0 2.7 60 2.7
4th Qtr 11/8/06 <1.0 13.6 <1.0 9.2 62 5.6
1st Qtr 2/28/07 <1.0 8.7 <1.0 6.6 79 12.3
2nd Qtr 6/27/07 <1.0 2.6 <1.0 1.8 75 9.9
3rd Qtr 8/15/07 <1.0 7.1 <1.0 5.1 65 5.4
4th Qtr 10/10/07 <1.0 1.4 <1.0 1 69 4.4
1st Qtr 3/28/08 <1.0 11 <1.0 26 52 <6.1
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 •J 89 9.8
1st Qtr 3/4/09 <1.0 <1.0 <1.0 <1.0 73 9.6
2nd Qtr 6/23/09 <1.0 <1.0 <1.0 <1.0 76 8.9
3rd Qtr 9/14/09 <1.0 <1.0 <1.0 <1.0 79 8.8
4th Qtr 12/17/09 <1.0 <1.0 <1.0 <1.0 76 5.2
1st Qtr 2/24/10 <1.0 <i.6 <1.0 <i.6 77 4.2
2nd Qtr 6/14/10 <1.0 2.1 <1.0 <1.0 64 4.7
3rd Qtr 8/24/10 <1.0 4.3 <1.0 <1.0 72 4.6
4th Qtr 10/15/10 <1.0 3 <1.0 <1.0 71 3.3
1st Qtr 2/22/11 <1.0 15 <1.0 <1.0 86 7
2nd Qtr 5/26/11 <1.0 16 <1.0 <1.0 81 5
3rd Qtr 8/17/11 <1.0 9.2 <1.0 <1.0 63 1.7
4th Qtr 11/16/11 NA NA NA NA 38 0.4
(1) 12/7/11 <1.0 <1.0 <1.0 1.4 NA
(3)1st Qtr 1/18/12 <1.0 <1.6 <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 <1.0 220 <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
i.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 64.3 <1.0 <1.0 60.6 1.81
3rd Qtr 8/3/17 <1.0 143 <1.0 <1.0 67.1 2.63
(1) VOCs were resampled because laboratory missed holding time.
(2) VOCs were resampled
(3) As of March 2012^both_north_andsouth wildjlfe^pondsno^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
(Spg/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)
TW4-18
1st Qtr 3/16/05 NA 38 NA NA NA 14.1
2nd Qtr 5/25/05 NA 29.8 NA NA NA 12.9
3rd Qtr 8/31/05 <1.0 39 2.8 <1.0 NA 13.3
4th Qtr 12/7/05 <1.0 14 1.1 <1.0 41 7.3
1st Qtr 3/9/06 <1.0 12 1.6 <1.0 36 5.9
2nd Qtr 6/14/06 <1.0 12 2.7 <1.0 35 4.7
3rd Qtr 7/20/06 <1.0 10.8 <1.0 <1.0 35 6.1
4th Qtr 11/8/06 <1.0 12.5 <1.0 <1.0 34 5.7
1st Qtr 2/28/07 <1.0 9.2 <1.0 <1.0 30 5.1
2nd Qtr 6/27/07 <1.0 8 <1.0 <1.0 28 4.9
3rd Qtr 8/15/07 <1.0 8.9 <1.0 <1.0 32 5.0
4th Qtr 10/10/07 <1.0 7.4 <1.0 <1.0 27 4.4
1st Qtr 3/28/08 <1.0 6.4 <1.0 <1.0 23 0.7
2nd Qtr 6/25/08 <1.0 5.7 <1.0 <1.0 23 4.6
3rd Qtr 9/10/08 <1.0 8 <1.0 <1.0 26 4.9
4th Qtr 10/15/08 <1.0 9.4 <1.0 <1.0 30 5.2
1st Qtr 3/4/09 <1.0 11 <1.0 <1.0 29 5.2
2nd Qtr 6/23/09 <1.0 16 <1.0 <1.0 30 6.2
3rd Qtr 9/14/09 <1.0 13 <1.0 <1.0 26 5.9
4th Qtr 12/22/09 <1.0 8.2 <1.0 <1.0 30 5.4
1st Qtr 2/24/10 <1.0 69 <1.0 <1.0 41 5.1
2nd Qtr 6/14/10 <1.0 29 <1.0 <1.0 35 9.0
3rd Qtr 8/12/10 <1.0 29 <1.0 <1.0 37 9.0
4th Qtr 10/15/10 <1.0 30 <1.0 <1.0 50 10.0
1st Qtr 2/22/11 <1.0 39 <1.0 <1.0 52 10.0
2nd Qtr 5/26/11 <1.0 26 <1.0 <1.0 36 9.0
3rd Qtr 8/17/11 <1.0 29 <1.0 <1.0 23 46
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 14.2
1st Qtr 1/30/14 <1.0 6.93 <1.0 <1.0 38.9 12.8
2nd Qtr 5/22/14 <1.0 6.93 <1.0 <1.0 47 12.2
3rd Qtr 8/14/14 <1.0 32.8 <1.0 <1.0 49 9.8
4th Qtr 10/28/14 <1.0 33 <1.0 <1.0 40.8 .........................................1.1,1
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 <1.0 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 4.50
3rd Qtr 8/3/17 <1.0 62.8 <1.0 <1.0 40.4 4.24
Duplicate TW4-75 <1.0 62.3 <1.0 <1.0 41.5 4.31
(1) VOCs were resampled because laboratory missed holding time.
(2) As of Marcji 2012 oth_n ort h_an ds ou th wild jde_po nd s_n I onjjer^rec ei vin 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 iig/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)
pumping well started 4/3003)
1st Qtr 3/16/05 NA 2,200 NA NA NA 5.3
2nd Qtr 5/25/05 NA 1,200 NA NA NA 5.7
3rd Qtr 8/31/05 <5.0 1,400 <5.0 <5.0 NA 4.6
4th Qtr 12/7/05 <50 ...............2.800 <50 <50 81 <0.1
1st Qtr 3/9/06 <50 1,200 <50 <50 86 4
2nd Qtr 6/14/06 <50 1,100 <50 <50 116 5.2
3rd Qtr 7/20/06 <50 1,120 <50 <50 123 4.3
4th Qtr 11/8/06 1.6 1.050 2.6 <1.0 134 4.6
1st Qtr 2/28/07 1.3 1,200 <1.0 <1.0 133 4
2nd Qtr 6/27/07 Did not sample
3rd Qtr 8/15/07 1.9 1,100 <1.0 <1.0 129 4.1
4th Qtr 10/10/07 1.9 ...............1.100 <1.0 <1.0 132 4
1st Qtr 3/28/08 2.9 1,800 <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
('’12/5/11 5.4 2.200 <1.0 <1.0
(2)1 st Qtr 1/23/12 1.5 650 <1.0 <1.0 138 0.6
2nd Qtr 6/6/12 1.1 460 <1.0 <1.0 149 2.4
3rd Qtr 9/4/12 3.5 950 <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 ..................?42 <1.0 <1.0 134 4.7
1st Qtr 1/27/14 4.05 586 <1.0 <1.0 134 1.6
2nd Qtr 5/19/14 5.51 810 <1.0 <1.0 152 1.3
3rd Qtr 8/11/14 1.9 1,410 8.3 <1.0 140 1.6
4th Qtr 10/21/14 4.8 4,310 <1.0 <1.0 130 4.7
1st Qtr 3/9/15 8.92 4,660 <1.0 <1.0 238 8.56
2nd Qtr 6/8/15 2.62 1,570 <1.0 <1.0 180 0.916
3rd Qtr 8/31/15 <1.0 7,860 7.78 <1.0 326 11.6
4th Qtr 10/19/15 12.2 L.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
3rd Qtr 7/26/17 13-°l <1.0 <1.0 218 1.120
(1) VOCs were resampled because laboratory missed holding time.
(2) As of March Ml^^othjiorth^andsouth wild jifepondsno^longer^recelving_ 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 Mfl/L)
Chloroform
(70 pg/L)
Chloromethane
(30 pg/L)
Methylene Chloride
(5 pg/L)
Chloride
No GWQS (mg/L)
Nitrate, Nitrate + Nitrite
(10 mg/L)
TW4-20 (chloroform
pumping well started 8/4/05)
1st Qtr 3/16/05 Monitor well was not installed
2nd Qtr 5/25/05 NA 39^000 NA NA 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
<1.6 4.4 153 3.30
4th Qtr 12/14/09 14 15,000 <1.0 3.0 187 5.30
1st Qtr 2/17/10 2.7 3,500 <1.0 3.2 179 2.00
2nd Qtr 6/14/10 11 18,000 <1.0 3.7 200 5.60
3rd Qtr 8/16/10 12 15,000 <1.0 2.2 196 5.30
4th Qtr 10/15/10 20 24,000 <1.0 5.5 203 4.60
1st Qtr 2/23/11 27 31,000 <1.0 19.0 220 4.40
2nd Qtr 6/1/11 10 8,100 <1.0 2.1 177 4.80
3rd Qtr 8/17/11 7.3 3,800 <1.0 3.1 207 6.50
4th Qtr 11/16/11 ......................................7,2 ...............7,?QQ <1.0 2.5 186 4 20
(2)1 st Qtr 1/23/12 10 11,000 <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 17JJ00 10.8 1 293j 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
3rd Qtr 7/26/17 25.0 ----------27J500 1.25 <1.0 _______________________292,10.8
VOCswere_resam£led becausejaboratory_missed_holdin£tmie.
(2) As of March 2012 both north and south wild life ponds no longer receiving water.
_p]_Ch loroformj)um£in£ we 11 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 pg/L)
Chloroform
(70 pg/L)
Chloromethane
(30 pg/L)
Methylene Chloride
(5 pg/L)
Chloride
No GWQS (mg/L)
Nitrate, Nitrate + Nitrite
(10 mg/L)
TW4-21 (chloroform pumping
well 6/9/15)
1st Qtr 3/16/05 Monitor well was not installed
2nd Qtr 5/25/05 NA 192 NA NA NA 14.6
3rd Qtr 8/31/05 <5.0 78 <5.0 <5.0 NA 10.1
4th Qtr 12/7/05 <1.0 86 <1.0 <1.0 353 9.6
1st Qtr 3/9/06 <2.5 120 <2.5 <2.5 347 8.5
2nd Qtr 6/14/06 <2.5 120 <2.5 <2.5 318 10.2
3rd Qtr 7/20/06 <2.5 108 <2.5 <2.5 357 8.9
4th Qtr 11/8/06 2 ...................139 <1.0 <1.0 296 8.7
1st Qtr 2/28/07 1.8 160 <1.0 <1.0 306 8.7
2nd Qtr 6/27/07 5.8 300 <1.0 <1.0 327 8.6
3rd Qtr 8/15/07 <1.0 140 <1.0 <1.0 300 8.6
4th Qtr 10/10/07 <1.0 120 <1.0 <1.0 288 8.3
1st Qtr 3/28/08 7 390 <1.0 <1.0 331 14.3
2nd Qtr 6/25/08 1.7 180 <1.0 <1.0 271 8.8
3rd Qtr 9/10/08 1.6 120 <1.0 <1.0 244 7.57
4th Qtr 10/15/08 NA NA NA NA 284 8.0
11/18/08 2 170 <2.0 <2.0 NA NA
1st Qtr 3/11/09 <1.0 180 <1.0 <1.6 279 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 HBHI 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 <1.0 207 103
4th Qtr 11/13/13 <1.0 204 <1.0 <1.0 206 9.0
1st Qtr 2/5/14 6.23 220 <1.0 2.04 200 11.4
2nd Qtr 5/22/14 4.73 240 <1.0 2.04 243 11.5
3rd Qtr 8/27/14 <1.0 204 <1.0 <1.0 230 7.1
4th Qtr 10/29/14 1.04 229 <1.0 <1.0 252 10.0
1st Qtr 3/12/15 1.75 292 <1.0 <1.0 255 10.9
(3)2nd Qtr 6/8/15 1.92 366 <1.0 <1.0 494 13.1
3rd Qtr 8/31/15 <1.0 281 <1.0 <1.0 499 14.7
4th Qtr 10/19/15 <1.0 339 <1.0 <1.0 413 14.3
1st Qtr 3/9/16 <1.0 390 <1.0 <1.0 452 14.6
2nd Qtr 5/23/16 <1.0 545 <1.0 <1.0 425 13.1
3rd Qtr 7/25/16 <1.0 456 <1.0 <1.0 457 16.5
4th Qtr 10/12/16 <1.0 456 <1.0 <1.0 439 ..........................................13,5
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 9.53
3rd Qtr 7/26/17 1.05 537 <1.0 <1.0 _______________________“ZJ 18.20
(1) VOCs were resampled because laboratory missed holding time.
(2] _As of March 2012_both_north_andsouth wild 2ife_pondsno_lon£er_receiving_water_ j3j_Chloroform_£t£n£in£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 M9/L)
Chloroform
(70 ua/L)
Chloromethane
(30 M9/L)
Methylene Chloride
(5 ua/L)
Chloride
No GWQS (ma/L)
Nitrate, Nitrate + Nitrite
(10 mg/L)
TW4-22 (nitrate
pumping well started 1/26/13)
1st Qtr 3/16/05 Monitor well was not installed
2nd Qtr 5/25/05 NA 340 NA NA NA 18.2
3rd Qtr 8/31/05 <5.0 290 <5.0 <5.0 NA 15.7
4th Qtr 12/7/05 <5.0 ...................320 <5.0 <5.0 253 ........................................15,1
1st Qtr 3/9/06 <10 390 <10 <10 236 15.3
2nd Qtr 6/14/06 <10 280 <10 <10 221 14.3
3rd Qtr 7/20/06 <10 864 <10 <10 221 14.5
4th Qtr 11/8/06 <1.0 ...................350 1.6 <1.0 236 ..........................................15,9
1st Qtr 2/28/07 <1.0 440 <1.0 <1.0 347 209
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 ...................44Q <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 <1.0 114 18.0
2nd Qtr 6/1/11 <1.0 210 <1.0 <1.0 138 17.0
3rd Qtr 8/17/11 <1.0 450 <1.0 <1.0 120 15.0
4th Qtr 11/16/11 NA NA NA NA 174 19.0
(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 .110 <1.0 130.14.0
(3)1st Qtr 2/11/13 3.24 10,600 <1.0 <1.0 130 58.0
2nd Qtr 6/5/13 3.35 12,500 <1.0 <1.0 586 50.2
3rd Qtr 9/3/13 3.25 9,640 <1.0 <1.0 487 29.7
4th Qtr 10/29/13 8 09 13 300 <1 0 <1 0 501 45 2
1st Qtr 1/27/14 6.06 12,100 <1.0 2.83 598 54.6
2nd Qtr 5/19/14 6.65 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
<1.0 5-15°l <1.0 391 _____________________m
(1) VOCs were resampled because laboratory missed holding time.
j2J_As of March 2012Jjothjiorth_and_south wijd jife_ponds_no_longer_receivin£waU;r_
pj^Chlorraform^um^nawell 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
(Spg/L)
Chloroform
(70Mg/L)
Chloromethane
(30 ug/L)
Methylene Chloride
(Sug/L)
Chloride
No GWQS (mg/L)
Nitrate, Nitrate + Nitrite
(10 mq/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
<1.6 41 <0.1
2nd Qtr 6/25/08 <1.0 <1.0 <1.0 <1.0 41 <0.1
3rd Qtr 9/10/08 <1.0 <1.0 <1.0 <1.0 35 <0.05
4th Qtr 10/15/08 NA NA NA NA 51 <0.05
11/18/08 <2.0 <2.0 <2.0 <2.0 NA NA
1st Qtr 3/4/09 <1.0 <1.0 <1.0 <1.0 41 <0.1
2nd Qtr 6/23/09 <1.0 <1.0 <1.0 <1.0 43 <0.1
3rd Qtr 9/14/09 <1.0 <1.0 <1.0 <1.0 43 <0.1
4th Qtr 12/16/09 <1.0 <1.0 <1.0 <1.0 37 <0.1
1st Qtr 2/24/10 <10 <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 <6.1
2nd Qtr 5/30/13 <1.0 <1.0 <1.0 <1.0 44.7 0.1
3rd Qtr 9/5/13 <1.0 <1.0 <1.0 <1.0 48 <0.1
4th Qtr 11/7/13 <1.0 <1.0 <1.0 <1.0 43 <0.1
1st Qtr 1/23/14 <1.0 <1.0 <1.0 <1.0 44.6 <0.1
2nd Qtr 5/19/14 <1.0 <1.0 <1.0 <1.0 42.3 <0.1
3rd Qtr 8/13/14 <1.0 <1.0 <1.0 <1.0 46 <0.1
4th Qtr 10/28/14 <1.0 <1.0 <1.0 <1.0 46.8 <0.1
1st Qtr 3/12/15 <1.0 <1.0 <1.0 <1.0 47.3 <0.1
2nd Qtr 6/8/15 <1.0 <1.0 <1.0 <1.0 48.4 <0.1
3rd Qtr 9/3/15 <1.0 <1.0 <1.0 <1.0 54.1 <0.1
4th Qtr 10/28/15 <1.0 <1.0 <1.0 <1.0 46.4 <0.1
Duplicate TW4-70 <1.0 <1.0 <1.0 <1.0 46.4 <0.1ist Qtr 3/16/16 <i.o <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
3rd Qtr 8/2/17 <1.0 <1.0 <1.0 <1.0 51.8 <0.1
(1Ji_As of March 2012_both_north_and_southwHdJifej>ondsjio_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
OUSA White Mesa Mill
Well
Sampling Event
Parameter
(GWQS)
Carbon Tetrachloride
(Spg/L)
Chloroform
(70 pg/L)
Chloromethane
(30 pg/L)
I Methylene Chloride
(5 pg/L)
Chloride
No GWQS (mg/L)
Nitrate, Nitrate ♦ Nitrite
(10 mg/L)
TW4-24 (nitrate
pumping well started 1/26/13)
2nd Qtr 6/27/07 <1.0 2.6 <1.0 <1.0 770 26.1
3rd Qtr 8/15/07 <1.0 2.2 <1.0 <1.0 791 29
4th Qtr 10/10/07 <1.0 1.5 <1.0 <1.0 692 .........................................247
1st Qtr 3/28/08 <1.0 1.5 <1.0 <1.0 740 244
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)1st Qtr 1/16/12 <1.0 <1.0 <1.0 <1.0 373 37
2nd Qtr 6/6/12 <1.0 <1.0 <1.0 <1.0 355 37
3rd Qtr 8/30/12 <1.0 <1.0 <1.0 <1.0 489 37
4th Qtr 10/3/12 <1.0 1 <1.0 <1.0 405 38
(3)1 st Qtr 2/11/13 <1.0 1 <1.0 <1.0 1260 35.9
2nd Qtr 6/5/13 <1.0 17.4 <1.0 <1.0 916 23.7
3rd Qtr 8/30/13 <1.0 21.8 <1.0 <1.0 998 33
4th Qtr 10/29/13 <1.0 32.5 <1.0 <1.0 1030 35
1st Qtr 1/27/14 1.18 78.5 <1.0 <1.0 809 31.6
2nd Qtr 5/19/14 <1.0 62.7 <1.0 <1.0 1020 35.0
3rd Qtr 8/11/14 <1.0 76.3 <1.0 <1.0 1150 31.5
4th Qtr 10/21/14 <1.0 25.8 <1.0 <1.0 1050 35.7
1st Qtr 3/9/15 <1.0 49.2 <1.0 <1.0 944 34.6
2nd Qtr 6/8/15 <1.0 4.28 <1.0 <1.0 1290 31.8
3rd Qtr 8/31/15 <1.0 46.9 <1.0 <1.0 788 25.3
4th Qtr 10/19/15 <1.0 25.3 <1.0 <1.0 909 29.6
1st Qtr 3/9/16 <1.0 22.8 <1.0 <1.0 989 29.1
2nd Qtr 5/23/16 <1.0 69.6 <1.0 <1.0 771 24.2
3rd Qtr 7/25/16 <1.0 17.8 <1.0 <1.0 1180 34.4
4th Qtr 10/12/16 <1.0 20.8 <1.0 <1.0 1010 31.9
1st Qtr 3/8/17 <1.0 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
3rd Qtr 7/26/17 <1.0 17.8 <1.0 <1.0 1230 40.0
(1) VOCs were resampled because laboratory missed holding time.
(2) As of March 2012 ^othjiorth^and^south wild Jlfepondsno_lon£er_receiving^ water.
pj_Chloroforrn_£i£i£in£ 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
Sampling Event
Parameter
(GWQS)
Carbon Tetrachloride
(5 (jg/L)
Chloroform
(70Mg/L)
Chloromethane
(30Mg/L)
Methylene Chloride
(5 pg/L)
Chloride
No GWQS (mq/U
Nitrate, Nitrate + Nitrite
(10 mg/L)
TW4-25 (nitrate
pumping well started 1/26/13)
2nd Qtr 6/27/07 <1.0 <1.0 <1.0 <1.0 395 17.1
3rd Qtr 8/15/07 <1.0 2.2 <1.0 <1.0 382 29
4th Qtr 10/10/07 <1.0 <1.0 <1.0 <1.0 358 17
1st Qtr 3/28/08 <1.0 <1.0 <1.0 <1.0 374 18.7
2nd Qtr 6/25/08 <1.0 <1.0 <1.0 <1.0 344 22.1
3rd Qtr 9/10/08 <1.0 <1.0 <1.0 <1.0 333 18.8
4th Qtr 10/15/08 NA NA NA NA 366 21.3
4th Qtr 11/18/09 <2.0 <2.0 <2.0 <2.0 NA NA
1st Qtr 3/4/09 <1.0 <10 <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 ...............1.5
1st Qtr 2/16/11 <1.0 1.8 <1.6 <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
(2jist 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 <1.0 338 1Z
(3)1 st Qtr 2/11/13 <1.0 <1.0 <1.0 <1.0 190 9.04
2nd Qtr 6/5/13 <1.0 <1.0 <1.0 <1.0 136 5.24
3rd Qtr 9/4/13 <1.0 <1.0 <1.0 <1.0 119 5.69
4th Qtr 10/31/13 <1.0 <1.0 <1.0 <1.0 88.6 6.1
1st Qtr 1/27/14 <1.0 <1.0 <1.0 <1.0 85.7 2.16
2nd Qtr 5/19/14 <1.0 <1.0 <1.0 <1.0 51.1 1.21
3rd Qtr 8/11/14 <1.0 <1.0 <1.0 <1.0 67 1.6
4th Qtr 10/21/14 <1.0 <1.0 <1.0 <1.0 58.1 1.03
1st Qtr 3/9/15 <1.0 <1.0 <1.0 <1.0 310 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 <1.0 1.15 <1.0 <1.0 285 17.0
2nd Qtr 6/13/17 <1.0 <1.0 <1.0 <1.0 69.8 0.976
3rd Qtr 7/26/17 <1.0 <1.0 <1.0 <1.0 70.1 1.23
(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.
pj_Chloroform_£um£in^ 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
Sampling Event
Parameter
(GWQS)
Carbon Tetrachloride
(5 pg/L)
Chloroform
(70 uq/L)
Chloromethane
(30 ua/L)
Methylene Chloride
(5 pg/L)
Chloride
No GWQS (mq/L)
Nitrate, Nitrate + Nitrite
(10 mg/L)
TW4-26
2nd Qtr 6/14/10 <1.0 13 <1.0 <1.0 33 7.9
3rd Qtr 8/24/10 <1.0 5.2 <1.0 <1.0 17 9.0
4th Qtr 10/15/10 <1.0 5.4 <1.0 <1.0 22 9.6
1st Qtr 2/16/11 <1.0 2 <1.0 <1.0 30 10.0
2nd Qtr 5/26/11 <1.0 2.9 <1.0 <1.0 15 10.0
3rd Qtr 8/17/11 <1.0 2.8 <1.0 <1.0 19 11.0
4th Qtr 11/16/11 NA NA NA NA 26 10.0
11112/7/11 <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 14.4 144
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 <1.9 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 <1.0 16.2 15.8
2nd Qtr 6/20/17 <1.0 244 <1.0 <1.0 19 15.2
3rd Qtr 8/3/17 <1.0 419 <1.0 <1.0 25.8 15.2
TW4-27
(2)1 st Qtr 1/18/12 <1.0 9 <1.0 <1.0 11 24.0
2nd Qtr 6/13/12 <1.0 <1.0 <1.0 <1.0 17 41.0
3rd Qtr 9/4/12 <1.0 <1.0 <1.0 <1.0 21 37.0
4th Qtr 10/3/12 <1.0 <1.0 <1.0 <1.0 18 36.0
1st Qtr 2/7/13 <1.0 <1.0 <1.0 <1.0 18.8 31.2
2nd Qtr 6/13/13 <1.0 <1.0 <1.0 <1.0 20.3 29.4
3rd Qtr 8/30/13 <1.0 <1.0 <1.0 <1.0 19 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 <1.0 <1.0 <1.0 26.2 26.5
2nd Qtr 6/10/15 <1.0 <1.0 <1.0 <1.0 26.8 24.0
3rd Qtr 9/2/15 <1.0 1.3 <1.0 <1.0 26.8 20.9
4th Qtr 10/28/15 <1.0 1.6 <1.0 <1.0 26.2 23.5
1st Qtr 3/16/16 <1.0 2.11 <1.0 <1.0 28 25.0
2nd Qtr 5/26/16 <1.0 3.16 <1.0 <1.0 21.2 28.7
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 22.2
2nd Qtr 6/15/17 <1.0 5.65 <1.0 <1.0 27.9 23.8
3rd Qtr 8/2/17 <1.0 6.05 <1.0 <1.0 29.5 20.0
TW4-28
2nd Qtr 6/19/13 <1.0 <1.0 <1.0 <1.0 44.6 14.9
3rd Qtr 8/29/13 <1.0 <1.0 <1.0 <1.0 45.3 17.3
4th Qtr 11/6/13 <1.0 <1.0 <1.0 <1.0 45 3 16,2
1st Qtr 1/22/14 <1.0 <1.0 <1.0 <1.6 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 . .J.6,5
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 <10___<1.0 <1.0 52.7 .........................................18.7
1st Qtr 3/15/16 <1.0 <1.0 <1.0 <1.0 61.6 34.0
Duplicate TW4-65 <1.0 <1.0 <1.0 <1.0 61.4 32.6
2nd Qtr 5/25/16 <1.0 <1.0 <1.0 <1.0________________67.1 29.0
3rd Qtr 7/27/16 <1.0 <1.0 <1.0 <1.0 70.1 31.3
Duplicate TW4-65 <1.0 <1.0 <1.0 <1.0 70.9 35.6
4th Qtr 10/19/16 <1.0 <1.0 <1.0 <1.0 70.9 25.5
Duplicate TW4-65 <1.0 <1.0 <1.0 <1.0 73.7 .........................................2.5,4
1st Qtr 3/14/17 <1.0 <1.6 <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
3rd Qtr 7/27/17 <1.0 <1.0 <1.0 <1.0 67.1 24.8
(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
DUSA White Mesa Mill
Well
Sampling Event
Parameter
(GWQS)
Carbon Tetrachloride
(5 pg/L)
Chloroform
(70 pg/L)
Chloromethane
(30 pg/L)
Methylene Chloride
(5 pg/L)
Chloride
No GWQS (mg/L)
Nitrate, Nitrate + Nitrite
(10 mg/L)
TW4-29
2nd Qtr 6/19/13 <1.0 242 <1.0 <1.0 44.8 4.60
2nd Qtr 7/11/13 <1.0 262 <1.0 <1.0 37.7 3.52
3rd Qtr 9/26/13 <1.0 246 <1.0 <1.0 41.4 4.18
4th Qtr 11/13/13 <1.0 260 <1.0 <1.0 42.5 4.11
1st Qtr 2/5/14 <1.0 258 <1.0 <1.0 14.9 4.63
2nd Qtr 5/22/14 <1.0 262 <1.0 <1.0 38.2 3.52
3rd Qtr 8/27/14 <1.0 242 <1.0 <1.0 41 3.40
4th Qtr 10/29/14 <1.0 290 <1.0 <1.0 41 3.64
1st Qtr 3/12/15 <1.0 299 <1.0 <1.0 40.5 4.14
2nd Qtr 6/11/15 <1.0 329 <1.0 <1.0 42.5 2.95
3rd Qtr 9/3/15 <1.0 276 <1.0 <1.0 47.3 2.19
4th Qtr 10/29/15 <1.0 631 <1.0 <1.0 39.8 2.74
1st Qtr 3/17/16 <1.0 335 <1.0 <1.0 40.5 2.92
2nd Qtr 6/8/16 <1.0 366 <1.0 <1.0 42.9 2.51
3rd Qtr 8/3/16 <1.0 401 <1.0 <1.0 40.6 2.44
4th Qtr 10/26/16 <1.0 392 <1.0 <1.0 44.2 2.40
1st Qtr 3/16/17 <1.0 446 <1.0 <1.0 41.5 2.24
2nd Qtr 6/4/17 <1.0 420 <1.0 <1.0 42 2.26
3rd Qtr 8/4/17 <1.0 466 <1.0 <1.0 42.9 2.35
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
1st Qtr 3/17/16 <1.0 5.16 <1.0 <1.0 39.6 2.74
2nd Qtr 5/26/16 <1.0 7.38 <1.0 <1.0 40.2 2.04
3rd Qtr 8/3/16 <1.0 6.79 <1.0 <1.0 38.6 2.32
4th Qtr 10/20/16 <1.0 8.69 <1.0 <1.0 41.3 2.51
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
3rd Qtr 8/3/17 <1.0 15.7 <1.0 <1.0 39.8 3.11
TW4-31
2nd Qtr 6/19/13 <1.0 <1.0 <1.0 <1.0 28.4 1.3
3rd Qtr 9/5/13 <1.0 <1.0 <1.0 <1.0 29.4 1.1
4th Qtr 11/7/13 <1.0 <1.0 <1.0 <1.0 28 1.33
1st Qtr 1/23/14 <1.0 <1.0 <1.0 <1.0 28.5 1.32
2nd Qtr 5/21/14 <1.0 <1.0 <1.0 <1.0 26.3 1.22
3rd Qtr 8/13/14 <1.0 <1.0 <1.0 <1.0 30 1.1
4th Qtr 10/28/14 <1.0 <1.0 <1.0 <1.0 37.1 1.84
1st Qtr 3/11/15 <1.0 <1.0 <1.0 <1.0 30.6 1.33
2nd Qtr 6/10/15 <1.0 <1.0 <1.0 <1.0 31.1 1.19
3rd Qtr 9/2/15 <1.0 <1.0 <1.0 <1.0 30.4 0.916
4th Qtr 10/21/15 <1.0 <1.0 <1.0 <1.0 ___29,1 0.953
1st Qtr 3/16/16 <1.0 <1.0 <1.0 <1.6 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
3rd Qtr 8/2/17 <1.0 <1.0 <1.0 <1.0 33 1.11
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 2.82
2nd Qtr 6/15/17 <1.0 <1.0 <1.0 <1.0 53.5 2.37
3rd Qtr 8/2/17 <1.0 <1.0 <1.0 <1.0 65.8 2.47
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 ng/L)
Chloride
No GWQS (mq/L)
Nitrate, Nitrate + Nitrite
(10 mg/L)
TW4-33
4th Qtr 11/14/13 <1.0 126 <1.0 I <1.0 47.2 1.82
1st Qtr 1/30/14 <1.0 124 <1.0 <1.0 43.5 2.56
2nd Qtr 5/22/14 <1.0 121 <1.0 <1.0 46.8 1.63
3rd Qtr 8/27/14 <1.0 104 <1.0 <1.0 43 1.50
4th Qtr 10/29/14 <1.0 124 <1.0 <1.0 44.2 2.22
1st Qtr 3/12/15 <1.0 134 <1.0 <1.0 44.2 1.91
2nd Qtr 6/11/15 <1.0 127 <1.0 <1.0 46.6 1.62
3rd Qtr 9/3/15 <1.0 123 <1.0 <1.0 53.3 1.64
4th Qtr 10/29/15 <1.0 129 <1.0 <1.0 44.5 1.92
1st Qtr 3/17/16 <i.o 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 2.1 i
2nd Qtr 6/20/17 <1.0 103 <1.0 <1.0 49.2 2.34
3rd Qtr 8/3/17 <1.0 127 <1.0 <1.0 46.9 2.04
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
3rd Qtr 8/2/17 <1.0 <1.0 <1.0 <1.0 19.8 0.733
TW4-35
3rd Qtr 8/27/14 <1.0 <1.0 <1.0 <1.0 34 0.2
4th Qtr 10/28/14 <1.0 <1.0 <1.0 <1.0 34.1 0.351
1st Qtr 3/11/15 <1.0 <1.0 <1.0 <1.0 34.9 0.436
2nd Qtr 6/10/15 <1.0 <1.0 <1.0 <1.0 35.2 0.452
3rd Qtr 9/3/15 <1.0 <1.0 <1.0 <1.0 35.9 0.304
4th Qtr 10/28/15 <1.0 <1.0 <1.0 <1.0___33.4 0.419
1st Qtr 3/16/16 <1.0 <1.0 <1.0 <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
3rd Qtr 8/2/17 <1.0 <1.0 <1.0 <1.0 36.3 0.670
TW4-36
3rd Qtr 8/27/14 <1.0 <1.0 <1.0 <1.0 65 <0.1
4th Qtr 10/23/14 <1.0 <1.0 <1.0 <1.0 67.3 <0.1
1st Qtr 3/11/15 <1.0 <1.0 <1.0 <1.0 67.2 <0.1
2nd Qtr 6/10/15 <1.0 <1.0 <1.0 <1.0 69.3 <0.1
3rd Qtr 9/3/15 <1.0 <1.0 <1.0 <1.0 76.4 <0.1
4th Qtr 10/21/15 <1.0 <1.0 <1.0 <1,0......64.5 ___<M
1st Qtr 3/11/16 <1.0 <1.0 <1.0 <1.0 67.2 <0.1
2nd Qtr 5/25/16 <1.0 <1.0 <1.0 <1.0 72.3 <0.1
3rd Qtr 7/28/16 <1.0 <1.0 <1.0 <1.0 69.4 <0.1
4th Qtr 10/20/16 <1.0 <1.0 <1.0 <1.6 73.8 <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
3rd Qtr 8/2/17 <1.0 <1.0 <1.0 <1.0 69.6 <0.1
TW4-37(chloroform pumping
weH 6/9/15)
2nd Qtr 6/8/15 18.2 30,200 15.7 1.94 345 35.2
3rd Qtr 8/31/15 16.6 19,100 13.7 1.04 374 32.4
4th Qtr 10/19/15 12.5 19.500 9.38 1.17 399 34.6
1st Qtr 3/9/16 15.8 17,500 3.57 1.34 332 ---------------------------------^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 <1.6 304 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
15.1 <1.0 <1.0 277
TW4-38
4th Qtr 11/10/16 <1.0 <1.0 <1.0 <1.0 40 11.2
1st Qtr 3/15/17 <1.0 <1.0 <1.0 <1.0 35.7 10.6
2nd Qtr 6/15/17 <1.0 <1.0 <1.0 <1.0 36.2 10.8
3rd Qtr 8/2/17 <1.0 <1.0 <1.0 <1.0 36.9 10.1
TW4-39(chlofoform pumping
well (11/2016)
4th Qtr 11/11/16 <1 0 2.800 <1.0 <1.0 68.9 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
J±!____________________M______<1.0 1.5 132 7.74
Shaded indicates concentrations exceeding GWQS.
(1) VOCs were resampled because laboratory missed holding time.
Table 2
Summary of QA/QC Samples
3rd Quarter 2017
Parameter GWQS Duplicate of TW4-3 Duplicate of TW4-12 Duplicate of TW4-16
TW4-3 TW4-65 RPD TW4-12 TW4-70 RPD TW4-18 TW4-75 RPD
Chloride none 28.5 28.9 -1.4 65.3 67 -2.6 40.4 41.5 -2.7
Nitrate + Nitrite (as N)10 mg/L 6.4 6.24 1.9 25.1 26.7 -6.2 4.2 4.31 -2.6
Chloroform 70 pg/L <1.0 <1.0 nc 1.2 1.19 0.8 62.8 62.3 0.8
Carbon tetrachloride 5 pg/L <1.0 <1.0 nc <1.0 <1.0 nc <1.0 <1.0 nc
Chloromethane 30 pg/L <1.0 <1.0 nc <1.0 <1.0 nc <1.0 <1.0 nc
Methylene Chloride 5 pg/L <1.0 <1.0 nc <1.0 <1.0 nc <1.0 <1.0 nc
nc = not calculated
Tabel 3
Chloroform Mass Removal Calculations for the 3rd Qurater 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
(1)Chloroform (ug/L)1,400 1,230 0 948 1,310 1,290 3,290 8,840 27,600 537 5,150 17.8 0 15,000 10,000
Chloroform (g/L)1.40E-03 1.23E-03 0.00E+00 9.48E-04 1.31E-03 1.29E-03 3.29E-03 8.84E-03 2.76E-02 5.37 E-04 5.15E-03 1.78E-05 0.00E+00 1.50E-02 1.00E-02
Chloroform (Ibs/L)3.09E-06 2.72E-06 0.00E+00 2.09E-06 2.89E-06 2.85E-06 7.27E-06 1.95E-05 6.10E-05 1.19E-06 1.14E-05 3.93E-08 0.00E+00 3.31 E-05 2.21 E-05
Chloroform (Ibs/gal) 1.17E-05 1.03E-05 O.OOE+OO 7.93E-06 1.10E-05 1.08E-05 2.75E-05 7.39E-05 2.31 E-04 4.49E-06 4.31 E-05 1.49E-07 0.00E+00 1.25E-04 8.36E-05
Total gallons pumped 3rd qtr 2017 95,349.3 27,489.9 46,668.9 17,413.6 19,338.8 23,937.3 2,830.0 112,626.4 14,556.8 120,116.2 24,583.2 55,574.6 124,138.4 81,749.3 34,546.3
lbs of chloroform removed 1.1 0.3 0.00 0.14 0.21 0.26 0.08 8.3 3.36 0.54 1.06 0.01 0.00 10.25 2.89
Gallons of chloroform removed 0.09 0.02 0.00 0.01 0.02 0.02 0.01 0.68 0.27 0.04 0.09 0.001 0.00 0.83 0.24
total lbs of chloroform removed 28.5
lltotal gallons of chloroform removed 2.3
1) Assuming that the chloroform concentration result for the quarter monitoring event is the average chloroform concentration for the entire quarter.
Chloroform Pumplnp Wells
Nitrate Pumping Wells
label 3
Chloroform Mass Removal Calculations for the 3rd 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
<1)Chloroform (ug/L)1,400 1,230 0 948 1,310 1,290 3,290 8,840 27,600 537 5,150 17.8 0 15,000 10,000
Chloroform (g/L)1.40E-03 1.23E-03 O.OOE+OO 9.48E-04 1.31E-03 1.29E-03 3.29E-03 8.84E-03 2.76E-02 5.37E-04 5.15E-03 1.78E-05 0.00E+00 1.50E-02 1 00E-02
Chloroform (Ibs/L)3.09E-06 2.72E-06 0.00E+00 2.09E-06 2.89E-06 2.85E-06 7.27E-06 1.95E-05 6.10E-05 1.19E-06 1.14E-05 3.93E-08 O.OOE+OO 3.31 E-05 2.21 E-05
Chloroform (Ibs/gal)1.17E-05 1.03E-05 O.OOE+OO 7.93E-06 1.10E-05 1.08E-05 2.75E-05 739E-05 2.31 E-04 4.49E-06 4.31 E-05 1.49E-07 0.00E+00 1.25E-04 8.36E-05
Total gallons pumped 3rd qtr 2017 95,349.3 27,489.9 46,668.9 17,413.6 19,338.8 23,937.3 2,830.0 112,626.4 14,556.8 120,116.2 24,583.2 55,574.6 124,138.4 81,749.3 34,546.3
lbs of chloroform removed 1.1 0.3 0.00 0.14 0.21 0.26 0.08 8.3 3.36 0.54 1.06 0.01 0.00 10.25 2.89
Gallons of chloroform removed 0.09 0.02 0.00 0.01 0.02 0.02 0.01 0.68 0.27 0.04 0.09 0.001 0.00 0.83 0.24
total lbs of chloroform removed 28.5
total gallons of chloroform removed 2.3
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