DRC-2016-006582 - 0901a0688062948e

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V.I 89*
State of Utah
GARY R. HERBERT
Governor
SPENCER J. COX
Lieutenant Governor
Department of
Environmental Quality
Alan Matheson
Executive Director
DIVISION OF WASTE MANAGEMENT
AND RADIATION CONTROL
Scott T. Anderson
Director
DPX -Z016-0O&58Z.
MEMORANDUM
TO:
FROM:
DATE:
Phil Goble flP-* yif/'lPlt
Dean Henderson
April 25,2016
SUBJECT: Review of the 4th Quarter 2015 Chloroform Monitoring Report 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 February
24,2015 4th Quarter 2015 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”) June 7,2012 (Revision. 7.2)
• The EFR Groundwater Corrective Action Plan (“GCAP”) September 14, 2015 (Revision 0)
• Utah Department of Environmental Quality Division of Radiation Control Guidance for
Groundwater Split Sampling Collection at Uranium Mill Operations, August 7,2007.
REVIEW
Monitor Well Sampling
The following monitor wells were sampled as required in the QAP (see Table 1 below):
MW-4
MW-26
MW-32
TW4-1
TW4-2
TW4-7
TW4-8
TW4-9
TW4-10
TW4-11
TW4-18
TW4-19
TW4-20
TW4-21
TW4-22
TW4-28
TW4-29
TW4-30
TW4-31
TW4-32
195 North 1950 West • Salt Lake City, UT
Mailing Address: P.O. Box 144880 • Salt Lake City, UT 84114-4880
Telephone [phone] • Fax [phone] • T.D.D. (801) 536^4414
www.deq.utah.goo
Printed on 100% recycled paper
Page 2
TW4-3
TW4-4
TW4-5
TW4-6
TW4-12
TW4-13
TW4-14
TW4-16
TW4-23
TW4-24
TW4-25
TW4-26
TW4-27
TW4-33
TW4-34
TW4-35
TW4-36
TW4-37
In each quarter the monitoring wells were purged using the three approved QAP well purging strategies
and meet QAP requirements for each strategy:
1. Purging two casing volumes with stable field parameters for specific conductivity,
turbidity, pH, redox potential, and water temperature (within 10% RPD):
Wells: MW-32, TW4-5, TW4-8, TW4-9, TW4-16, TW4-18, TW4-23, and TW4-32.
2. Purging a well to dryness and stability of field parameters for pH, specific conductivity, and
water temperature only after recovery:
Wells: TW4-3, TW4-6, TW4-7, TW4-10, TW4-12, TW4-13, TW4-14, TW4-26, TW4-27, TW4-
28, TW4-29, TW4-30, TW4-31, TW4-33, TW4-34, TW4-35 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, and TW4-37.
The water samples for the above wells were analyzed for the following constituents as required
in the QAP:
Chloroform, Chloromethane, Carbon tetrachloride, Methylene chloride, Chloride and Nitrate +
Nitrite as Nitrogen. The analytical methods used is consistent with the requirements of the QAP
requirements. 1
Holding Times
The 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
All samples were received within the required QAP temperature limit of 6° C.
Detection T.imits
All analytes were measured and reported to the required reporting limits. However, several sets of
sample results had the reporting limit raised for at least one analyte due to matrix interference and/or
sample dilution. In all cases the reported value for the analyte was higher than the increased detection
limit.
Page 3
EFR Duplicate Sample Comparison
Two duplicate samples were collected. Monitor well TW4-12 and its duplicate sample TW4-65 and
TW4-23 and its duplicate sample TW4-70. All analytical results for the two sample/duplicate pairs were
within the 20% acceptance limits (see Table 2 below)
Groundwater Head Monitoring
Depth to groundwater was measured in the following wells and/or piezometers, as required in Part I.E.3
of the Permit:
• The quarterly groundwater compliance monitoring wells.
• Existing monitoring well MW-4 and all of the temporary chloroform investigation wells.
• Piezometers P-1, P-2, P-3, P-4 and P-5.
• MW-20 and MW-22.
• Nitrate monitoring wells.
• The DR piezometers which were installed during the Southwest Hydrologic Investigation.
In addition, weekly and monthly depth to groundwater measurements were taken in MW-4, MW-26,
TW4-1, TW4-2, TW4-4, TW4-11, TW4-19, TW4-20, TW4-21, TW4-22, TW4-24, TW4-25, TW4-37
and TWN-2.
Mass Removed and Plume Residual Mass
Chloroform removal was first estimated from the first quarter 2007. Since that estimation the mass
removed by each pumping well for each quarter has been calculated. Estimated reported mass removed
during the 4th Quarter, 2015 is 32.4 lbs. Table 3 below verifies this estimate.
Using the “Chloroform Plume Mass Calculation Method” as described in Appendix A of the GCAP the
residual mass of chloroform within the plume is estimated as 1,869 lb. As per Part III.B.2 of the
GCAP, the electronic files were used in calculating the mass estimate were provided with the report.
The following files were used to calculate the estimated chloroform mass within the chloroform plume:
• Excel spreadsheet that included: well name; well location (easting and northing); Laboratory
reported concentration in pg/1 in the 4th quarter 2016 and corresponding log equivalent value.
• Surfer® griding parameters: kriging parameters: SURFER™ default parameters (point kriging,
linear variogram, slope = 1, no anisotropy [anisotropy = 1], no search constraints; min x, max x
(UTME[m]): 631900,633043; min y, may y (UTME[mj): 4154240,4155550.64; grid spacing in
x,y(m): 15.24,15.24
• Surfer chloroform concentration grid file.
• Concentration GE 70 Grid file
• Intermediate Surfer Grid Files: water level grid; aquifer base grid; saturated thickness grid
Based on the review of these files it appears that the date entered and generated is appropriate to
calculate an estimated chloroform mass within the chloroform plume and EFR followed Part III.B.2 and
Appendix A of the GCAP.
Page 4
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.
f) Copies of DUS A field records, laboratory reports and chain of custody forms.
DWMRC Slit Sampling Event
On October 21,2015, DWMRC staff Dean Henderson observed and split sampled eight (8) wells TW4-
3, TW4-12, TW4-13, TW4-14, TW4-25, TW4-28, TW4-32, TW4-36, and collected a duplicate sample
from TW4-12 and identified as TW4-81 with EFR (see Table 4 below). After observing EFR staff
Page 5
performed the sampling and monitoring and review of this Report, it appears that EFR appropriately
followed the QAP and Plan.
Comparisons of duplicate samples analytical results are summarized in Tables 2 and 4 below. To
determine if sample results between two samples from the same laboratory are comparable, a relative
percent difference (“RPD”) of 20% is acceptable (DRC 2007). To determine if sample results between
two samples from two different laboratories are comparable a RPD of 30% is acceptable (DRC 2007).
DWMRC Duplicate Sample Comparison
The RPD comparisons between TW4-12 and its duplicate TW4-81 analytical results were found below
20% and therefore comparable.
DWMRC Sample Comparison to EFR Samples
The RPD comparison between the DWMRC analytical results and EFR analytical results for the eight
(8) wells found on Table 4 were below 30% with the exception of the analytical results for nitrate in
well TW4-32. The analytical result for nitrate DWMRC sample was 3.0 mg/1 and the EFR sample was
1.19 mg/1. The resulting RPDs was 86.4%. Both analytical results were below the GWQS for nitrate of
10 mg/L therefore no action recommended. The remainder of the analytical results are comparable.
Evaluation of the Chloroform Contaminate Plume and Its Associated Contaminants
Bounding Chloroform Plume
Groundwater monitoring data up to the 4th Quarter, 2015 monitoring event appeared to show that the
chloroform contaminate plume (“Plume”) and associated contaminants, carbon tetrachloride,
chloromethane, and methylene chloride is bound by up gradient, cross gradient, and down gradient
compliance monitoring wells that have a chloroform concentration of <70 pg/L (GWQS = 70 pg/L).
Performance Monitor (“PM”! Wells Exceeding Chloroform Concentrations GWQS of 70pg/L
Seven wells: TW4-6, TW4-7, TW4-8, TW4-10, TW4-16, TW4-29, and TW4-33.
Compliance Monitor (“CM”! Wells with Chloroform Concentrations between 1 ug/L and 70ug/L
Eight wells: TW4-5, TW4-9, TW4-14, TW4-18, TW4-26, TW4-27, and TW4-30
For the first time since sampling began (1st quarter 2012) at CM well TW4-27 it exceeded the
chloroform minimum detection limit (<1.0 pg/L) for both the 3rd and 4th quarters of 2015 at 1.3 pg/L
and 1.6 pg/L respectively (see Table 1 below). Well TW4-27 helps define the southern boundary area
of the Plume and is located approximately 200 feet east and down gradient of PM well TW4-33, and that
as of this 4th quarter monitoring event has a reported chloroform concentration of 129 pg/L (see Table 1
below). No action is recommended but a close watch on TW4-27 will be done to see if chloroform
increases to above 70 pg/L.
For the fourth consecutive monitoring event compliance monitor well PM TW4-30 has exceeded the
chloroform minimum detection limit of <1.0 pg/L with 3.48 pg/L (see Table 1 below). TW4-30 helps
define the southern boundary area of the Plume and is located approximately 200 feet east and down
gradient of CM well TW4-29 that as of the 3rd quarter 2015 monitoring event has a reported chloroform
concentration of 631 pg/L (see Table 1 below). The leading edge of Plume may be approaching TW4-
Page 6
30. No action is recommended but a close watch on TW4-30 well be done to see if chloroform increases
to above 70 pg/L.
Pumping Wells
Pumping wells MW-4, MW-26, TW4-1, TW4-2, TW4-4, TW4-11, TW4-19, TW4-20, TW4-21 TW4-22
and TW4-37 exceed chloroform concentrations of 70pg/L. Pumping well TW4-24 had a chloroform
concentration of 25.3 pg/L and TW4-25 had non-detectable chloroform concentrations (<1.0 pg/L).
PM Wells Below the Laboratory Chloroform Detection Limit f<1.0 pg/L)
The following monitor wells are below the laboratory detection limit for chloroform (<1.0 pg/L): MW-
32, TW4-3, TW4-12, TW4-13, TW4-23, TW4-28, TW4-31, TW4-32, TW4-34, TW4-35 and TW4-36.
Nitrate. Nitrate + Nitrite (“nitrate”) Concentrations
Pumping wells TW4-21, TW4-22, and TW4-24 all exceed the nitrate GWQS of 10 mg/1. All of these
nitrate exceedances for these wells appear to be a result of the nitrate contaminant plume up-gradient of
the chloroform contaminant plume. This nitrate contaminant plume is being addressed under the Nitrate
Corrective Action Plan (“NCAP”), approved on December 12,2012.
Monitor wells TW4-10, TW4-12, TW4-26, TW4-27, and TW4-28 continue to exceeded the nitrate
GWQS of 10 mg/1. The source of these nitrate exceedances appear not to be associated with the nitrate
plume addressed in the NCAP. The nitrate source for these wells may be from the same source as the
chloroform plume.
TW4-10 is located within the chloroform plume 70 pg/L boundary (1350 pg/L). Both the nitrate and
chloroform concentrations at TW4-10 are likely to be captured at downgradient pumping wells (TW4-11
or TW4-2).
TW4-28 is approximately 235 feet downgradient of TW4-12 and the source of nitrate may not be from
the chloroform plume because they are outside plume boundary with chloroform concentrations of <1.0
pg/L. Because well TW4-32 is approximately 250 feet down gradient of TW4-28 and has a nitrate
concentration below the GWQS of 1.19 mg/L, at this time no action is recommended. However, should
future nitrate concentration in TW4-32 increases to above 10 mg/L or has an increasing trend additional
investigations may be recommended.
TW4-26 source of nitrate may not be from the chloroform plume because its outside plume boundary
with chloroform concentrations of 3.45 pg/L. Because wells TW4-29 and TW4-34 are approximately
500 feet down gradient of TW4-26 and have nitrate concentrations below the GWQS of 2.74 mg/L and
0.37 mg/L respectively, at this time no action is recommended. However, should future nitrate
concentrations in TW4-29 and TW4-34 increases to above 10 mg/L or shows increasing trends
additional investigations may be recommended.
TW4-27 source of nitrate may not be from the chloroform plume because its outside plume boundary
with a chloroform concentration of 1.6 pg/L. Because well TW4-31 is approximately 200 feet down
gradient of TW4-27 that has a nitrate concentration below the GWQS of 0.95 mg/L, at this time no
Page 7
action is recommended. However, should future nitrate concentrations in TW4-31 increases to above 10
mg/L or shows an increasing trend additional investigations 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 Director Signature, notifying EFR of the review and closing out of 4th
Quarter 2015 Chloroform Monitoring Report for the chloroform contamination investigation.
References
Page 8
Utah Department of Environmental Quality Division of Radiation Control Guidance for
Groundwater Split Sampling Collection at Uranium Mill Operations, August 7,2007.
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)
TABLE 1 (1 of 27)
Historic Summary Of Monitoring Parameters Up To The 3rd Quarter 2015
Chloroform Contamination Investigation
DUSA White Mesa Mill
Well
Sampling Event
Carbon Tetrachloride
_____(5 H9'L)_____
Chloroform
(70pg/L)
Chloromethane
___(3° pg'i)___
Parameter
(GWQS)
Methylene Chloride
_____(5 pg'L)____
Chloride
No GWQS (mg/L)
Nitrate, Nitrate + Nitrite
(10 mg/L)
MW-4(chloroform pumping well started pumping 3/4/03)1st Qtr 3/16/05
2nd Qtr 5/25/05
3rd Qtr 8/31/05
4th Qtr 12/7/05
NA
NA
<10
<50
2,900
3,170
3,500
3,000
NA
NA
<10
<50
NA
NA
<10
<50
NA
NA
NA
53
6.3
7.1
7.0
7.0
1st Qtr 3/9/06
2nd Qtr 6/14/06
3rd Qtr 7/20/06
4th Qtr 11/8/06
<50
<50
<50
2.1
3,100
3,000
2,820
2,830
<50
<50
<50
1.4
<50
<50
<50
<1.0
6.0
6.0
1.2
6.4
1st Qtr 2/28/07
2nd Qtr 6/27/07
3rd Qtr 8/15/07
4th Qtr 10/10/07
1.6
1.8
1.9
1.7
2,300
2,000
2,600
2,300
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
6.3
70
6.2
6.2
1st Qtr 3/28/08
2nd Qtr 6/25/08
3rd Qtr 9/10/08
4th Qtr 10/15/08
1.7
1.8
1.8
1.7
2,400
2,500
1,800
2,100
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
5.8
61
6.4
5.9
1st Qtr 3/4/09
2nd Qtr 6/23/09
3rd Qtr 9/14/09
4th Qtr 12/14/09
1.5
1.3
1.4
1.6
2,200
1,800
2,000
1,800
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
5.7
52
5.3
5.8
1st Qtr 2/17/10
2nd Qtr 6/14/10
3rd Qtr 8/6/10
4th Qtr 10/15/10
1.2
1.2
1.5
1.4
1,600
2,100
1,900
1,500
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
4.0
5.1
4.8
4.9
1st Qtr 2/23/11
2nd Qtr 6/1/11
3rd Qtr 8/17/11
4th Qtr 11/16/11
1.5
1.4
1.1
1.3
1,700
1,700
1,700
1,600
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
4.6
4.9
4.9
5.1
1st Qtr 1/23/12
2nd Qtr 6/6/12
3rd Qtr 9/4/12
4th Qtr 10/4/12
1
1.2
1.5
1
1,500
1,400
1,500
1,300
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
41.0
39.0
41.0
41.0
4.8
4.9
5.0
4.8
1st Qtr 2/11/13
2nd Qtr 6/5/13
3rd Qtr 9/3/13
4th Qtr 10/29/13
1.48
1.31
1.13
5.58
1,670
1,490
1,520
1,410
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
37.8
44.0
41.4
40.1
4.78
4.22
4.89
5.25
1st Qtr 1/27/14
2nd Qtr 5/19/14
3rd Qtr 8/11/14
4th Qtr 10/21/14 <1.0
4.15
5.21
7.6
1,390
1,390
1,490
1.440
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
38.5
39.9
41.0
41.5
4.7
4.08
3.7
5.07
1st Qtr 3/9/15
2nd Qtr 6/8/15
3rd Qtr 8/31/15
4th Qtr 10/19/15
<1.0
<1.0
<1.0
1.26 1,400
1,300
1,200
1,200
<1.0
<1.0
<1.0
1.42
<1.0
<1.0
<1.0
<1.0
40.7
43.1
44.3
40.8
5.75
2.53
4.79
4.43
MW-4A(TW4-A)
1st Qtr 3/16/05
2nd Qtr 5/25/05
3rd Qtr 8/31/05
4th Qtr 12/7/05
NA
NA
<10
<50
3,700
3,740
3,800
3.000
NA
NA
<10
<50
NA
NA
<10
<50
NA
NA
NA
55
7.1
7.8
6.9
6.7
1st Qtr 3/9/06
2nd Qtr 6/14/06
3rd Qtr 7/20/05
4th Qtr 11/8/05
<50
<50
<50
2.4
3,700
3,300
3,190
3,370
<50
<50
<50
<1.0
<50
<50
<50
<1.0
5.8
7.3
1.2
7.1
7.11st Qtr 2/28/07 1.9 2,500 <1.0 <1.0
Well abandonded
NA = not analyzed
Shaded indicates concentrations exceeding GWQS.
Bold and italics indicates the MDL exceeded the GWQS.
TABLE 1 (2 of 27)
Historic Summary Of Monitoring Parameters Up To The 3rd Quarter 2015
Chloroform Contamination Investigation
DUSA White Mesa Mill
Well
Sampling Event
Carbon Tetrachloride
_____(5 pg/L)_____
Chloroform
(70 pg/L)
Chloromethane
___(30 pg/L)___
Parameter
(GWQS)
Methylene Chloride
_____(s pg/M____
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
2nd Qtr 5/25/05
3rd Qtr 8/31/05
4th Qtr 12/7/05
NA
NA
<5.0
<50
310
442
960
1,000
NA
NA
5.4
<50
NA
NA
<5.0
<50
NA
NA
NA
55
0.3
0.2
0.2
0.3
1st Qtr 3/9/06
2nd Qtr 6/14/06
3rd Qtr 7/20/06
4th Qtr 11/8/06
<50
<50
<50
<1.0
1,100
830
2,170
282
<50
<50
<50
<1.0
<50
<50
<50
2.6
0.2
0.2
1.4
0,3"o'.
0.4
1
0.66.1
0.6
0.2
0.1
1st Qtr 2/28/07
2nd Qtr 6/27/07
3rd Qtr 8/15/07
4th Qtr 10/10/07
<1.0
<1.0
<1.0
<1.0
570
300
1,400
2,000
<1.0
<1.0
<1.0
<1.0
5.5
13
36
14
1st Qtr 3/28/08
2nd Qtr 6/25/08
3rd Qtr 9/10/08
4th Qtr 10/15/08
11/18/08
<1.0
<1.0
<1.0
NA
<2.0
NA
930
1,300
630
1,700
<1.0
<1.0
<1.0
NA
<2.0
NA
40
53
24
100 NA NA
1st Qtr 3/4/09
2nd Qtr 6/23/09
3rd Qtr 9/14/09
4th Qtr 12/14/09
<1.0
<1.0
<1.0
<1.0
950
410
850
1,100
<1.0
<1.0
<1.0
<1.0
51
12
30
40
0.4
0.2
0.1
2.3
1st Qtr 2/17/10
2nd Qtr 6/14/10
3rd Qtr 8/16/10
4th Qtr 10/15/10
<1.0
<1.0
<1.0
1.2
730
1,600
2,200
970
<1.0
<1.0
<1.0
<1.0
<1.0
19
21
6.5
0.2
6.8
0.6
0.7
1st Qtr 2/23/11
2nd Qtr 5/31/11
3rd Qtr 8/17/11
4th Qtr 11/16/11
(D.12/5/11
<1.0
<1.0
<1.0
NA
<1.0
450
1,800
720
NA
1,800
<1.0
<1.0
<1.0
NA
<1.0
3.6
1.3
7.2
NA
2.9
57
88
58
69
NA
0.5
0.4
0.9
2.0
NA
1st Qtr 2/7/12
2nd Qtr 6/6/12
3rd Qtr 9/4/12
4th Qtr 10/4/12
<1.0
<1.0
<1
<1
2,400
3,000
3,100
1,200
<1.0
<1.0
<1
<1
1.7
2.5
2.6
1.8
1st Qtr 2/11/13
2nd Qtr 6/5/13
3rd Qtr 9/3/13
4th Qtr 10/29/13
<1
<1.0
<1.0
<1.0
2,120
4,030
2,940
1,410
<1
<1.0
<1.0
<1
9.34
52.4
33.2
4.03
81.9
77.9
60.5
72.3
2.27
2.11
1.18
1.38
1st Qtr 1/27/14
2nd Qtr 5/19/14
3rd Qtr 8/11 /14
4th Qtr 10/21/14
<1.0
<1.0
<1.0
<1.0
1st Qtr 3/9/15
2nd Qtr 6/8/15
3rd Qtr 8/31/15
4th Qtr 10/19/15
<1.0
<1.0
<1.0
<1.0
1,400
1,960
2,120
2,090
1,980
1,980
2,350
2,680
<1.0
<1.0
<1.0
<1.0
<1.0
8.7
4.05
1.32
13.8
15.4
26
23.2
27.4
11.2
11.6
8.28
59.4
53.4
59
60.1
56.5
62
69.6
62.6
0.55
0.93
0.7
0.93
0.73
0.42
0.68
0.991
(1) VOCs were resampled because laboratory missed holding ti
NA = not analyzedShaded indicates concentrations exceeding GWQS.Bold and italics indicates the MDL exceeded the GWQS.
TABLE 1 (3 of 27)
Historic Summary Of Monitoring Parameters Up To The 3rd Quarter 2015
Chloroform Contamination Investigation
DUSA White Mesa Mill
Well
Sampling Event
Carbon Tetrachloride Chloroform
(70 pg/L)
Chloromethane
(30 Mg/L)
Parameter
(GWQS)
Methylene Chloride
(5 M9'L)
Chloride
No GWQS (mg/L)
Nitrate, Nitrate + Nitrite
(10 mg/L)
MW-32 (former TW4-17)
1st Qtr 3/16/05
2nd Qtr 5/25/05
3rd Qtr 8/31/05
4th Qtr 12/7/05
NA
NA
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
NA
NA
<1.0
3.2
NA
NA
<1.0
<1.0
NA
NA
NA
33
<0.1
<0.1
<0.1
<0.1
1st Qtr 3/9/06
2nd Qtr 6/14/06
3rd Qtr 7/20/06
4th Qtr 11/8/06
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
3.5
1.8
1.5
<1.0
<1.0
<1.0
<1.0
<0.1
<0.1
<1.0
<1
1st Qtr 2/28/07
2nd Qtr 6/27/07
3rd Qtr 8/15/07
4th Qtr 10/10/07
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
1st Qtr 3/28/08
2nd Qtr 6/25/08
3rd Qtr 9/10/08
4th Qtr 10/15/08
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<10
<1.0
<.1
<1.0
<1.0
<0.05
1st Qtr 3/4/09
2nd Qtr 6/23/09
3rd Qtr 9/14/09
4th Qtr 12/16/09
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1
<0.1
<0.1
<0.1
1st Qtr 2/17/10
2nd Qtr 6/14/10
3rd Qtr 8/16/10
4th Qtr 10/15/10
1st Qtr 2/23/11
2nd Qtr 5/25/11
3rd Qtr 8/16/11
4th Qtr 11/16/11
(1) 12/7/11
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
NA
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1,0<1.6
<1,0<i.6
<1.0
<1.0
<1.0
NA
<1.0
<1.0
<1.0
<1.0
NA
<1.0
<1.0
<1.0<1.6
NA
<1.0 NA
<0.1
<0.1
<0.1
<0.1
<0.1
<0.1<6,i
<6.1
NA
1st Qtr 1/18/12
2nd Qtr 6/22/12
3rd Qtr 9/5/12
4th Qtr 10/10/12
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1,0
<1.0
<0.1
<0.1
<0.1
<0.1
1st Qtr 2/11/13
2nd Qtr 6/18/13
3rd Qtr 9/3/13
4th Qtr 10/29/13
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
34.3
34.9
33
35.7
<0.1
<0,1
<0.1
<0.1
1st Qtr 1/29/14
2nd Qtr 5/23/14
3rd Qtr 8/26 /14
4th Qtr 10/29/14
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
34
39.7
34
34.9
<0.1
<0.1
<0.1
<0.1
1st Qtr 3/17/15
2nd Qtr 6/11/15
3rd Qtr 9/9/15
4th Qtr 10/28/15
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
36.3
35.8
37.7
34.7
<0.1
<0.1
<0.1
<0.1
(1) VOCs were resampled because laboratory missed holding time.
NA = not analyzed
Shaded indicates concentrations exceeding GWQS.
TABLE 1 (4 of 27)
Historic Summary Of Monitoring Parameters Up To The 3rd Quarter 2015
Chloroform Contamination Investigation
DUSA White Mesa Mill
Well
Sampling Event
Carbon Tetrachloride
(5 pg/L)
Chloroform
(70 pg/L)
Chloromethane
(30 pg/L)___
Parameter
(GWQS)
Methylene Chloride
(5 M9/L)
Chloride
No GWQS (mg/L)
Nitrate, Nitrate + Nitrite
(10 mg/L)
TW4-1 (chloroformpumping well started in 1/14/15)1st Qtr 3/16/05
2nd Qtr 5/25/05
3rd Qtr 8/31/05
4th Qtr 12/7/05
NA
NA
<10
<50
2,700
3,080
2,900
2,400
NA
NA
<10
<50
NA
NA
<10
<50
NA
NA
NA
52
9,1
10,6
9.8
9.7
1st Qtr 3/9/06
2nd Qtr 6/14/06
3rd Qtr 7/20/06
4th Qtr 11/8/06
<50
<50
<50
1.4
2,700
2,200
2,840
2,260
<50
<50
<50
<1.0
<50
<50
<50
<1.0
49
48
51
47
9.4
9.6
9.2
1st Qtr 2/28/07
2nd Qtr 6/27/07
3rd Qtr 8/15/07
4th Qtr 10/10/07
1.2
1.4
1.3
1.3
1,900
1,900
2,300
2,000
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
8.9
9
8.4
7.8
1st Qtr 3/28/08
2nd Qtr 6/25/08
3rd Qtr 9/10/08
4th Qtr 10/15/08
1.3
1.1
1.3
1.3
2,000
1,900
1,700
1,700
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
7.6
8.68
8.15
9.3
1st Qtr 3/11/09
2nd Qtr 6/23/09
3rd Qtr 9/14/09
4th Qtr 12/29/09
<1.0
<1.0
1.1
1
1,700
1,500
1,700
1,400
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
7.5
6.9
7.3
6.8
1st Qtr 3/3/10
2nd Qtr 6/14/10
3rd Qtr 8/18/10
4th Qtr 10/15/10
<1.0
<1.0
1.2
1
1,300
1,600
1,600
1,500
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
7.1
6.8
6.7
6.6
1st Qtr 2/24/11
2nd Qtr 6/1/11
3rd Qtr 8/18/11
4th Qtr 11/29/11
<1.0
<1.0
<1.0
<1.0
1,300
1,200
1,300
1,500
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
6 6
6.6
6.8
6.6
1st Qtr 1/24/12
2nd Qtr 6/14/12
3rd Qtr 9/28/12
4th Qtr 10/4/12
<1.0
<1.0
<1.0
<1.0
1,300
1,000
1,000
1,100
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
6.8
7.1
5.0
6.5
1st Qtr 2/13/13
2nd Qtr 6/19/13
3rd Qtr 9/3/13
4th Qtr 11/14/13
<1.0
<1.0
<1.0
3.66 1,320
1,100
1,150
1,280
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
37.6
39.1
37.6
36.5
6.99
6.87
7.12
7.08
1st Qtr 2/5/14
2nd Qtr 5/23/14
3rd Qtr 8/27/14
4th Qtr 10/29/141st Qtr 3/9/15 (started
pumping 1/14/15)
2nd Qtr 6/8/15
3rd Qtr 8/31/15
4th Qtr 10/19/15
<1.0
<1.0
5.47
4.77
1,090
1,020
845
1,140
<1.0
<1.0
<1.0
1.4
<1.0
<1.0
<1.0
<1.0
38.9
37.4
38
38.7
7.74
6.93
4.80
6.31
<1.0
<1.0
<1.0
<1.0
1,130
1,260
1,060
1,040
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
38.3
40.3
45.9
38.5
7.06
6.07
6.28
1,55
NA = not analyzed
Shaded indicates concentrations exceeding GWQS.
Bold and italics indicates the MDL exceeded the GWQS.
TABLE 1 (5 of 27)
Historic Summary Of Monitoring Parameters Up To The 3rd Quarter 2015
Chloroform Contamination Investigation
DUSA White Mesa Mill
Well
Sampling Event
Carbon Tetrachloride
_____(5 pg/L)_____
Chloroform
(70 H9'L)
Chloromethane
___(30 M9'L)___
Parameter
(GWQS)
Methylene Chloride
____(5 pg/L)____
Chloride
No GWQS (mg/L)
Nitrate, Nitrate + Nitrite
_____(10 mg/L)_____
TW4-2 (chloroform
pumping well starting 1/14/15)1st Qtr 3/16/05
2nd Qtr 5/25/05
3rd Qtr 8/31/05
4th Qtr 12/7/05
NA
NA
<10
<50
3,700
3,750
3,900
3,500
NA
NA
<10
<50
NA
NA
<10
<50
NA
NA
NA
56
7.7
8.6
8.0
7.8
1st Qtr 3/9/06
2nd Qtr 6/14/06
3rd Qtr 7/20/06
4th Qtr 11/8/06
<50
<50
<50
2.3
3,800
3,200
4,120
3,420
<50
<50
<50
<1.0
<50
<50
<50
<1.0
7.5
7.1
7.4
.. 7.6
7.3
7.8
7.3
6.9
6.9
7.4
7.1
8.0
1st Qtr 2/28/07
2nd Qtr 6/27/07
3rd Qtr 8/15/07
4th Qtr 10/10/07
1.8
2.5
2.2
2.1
2,300
3,000
340 (?)
3,200
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
1st Qtr 3/28/08
2nd Qtr 6/25/08
3rd Qtr 9/10/08
4th Qtr 10/15/08
11/18/08
NA
2.3
2.2
2.4
2.4
NA
3,300
3,100
2,800
3,200
<1.0
<1.0
<1.0
NA
<2.0
<1.0
<1.0
<1.0
NA
<2.0 NA NA
1st Qtr 3/11/09
2nd Qtr 6/23/09
3rd Qtr 9/14/09
4th Qtr 12/29/09
2.2
2
2
2
3,100
2,800
3,000
1,600
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
6.5
6.4
6.6
6.4
1st Qtr 3/3/10
2nd Qtr 6/14/10
3rd Qtr 8/18/10
4th Qtr 10/15/10
2
2.6
2.5
2.1
2,600
3,300
3,300
3,000
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
6.8
8.7
6.6
6.5
1st Qtr 2/24/11
2nd Qtr 6/2/11
3rd Qtr 8/17/11
4th Qtr 11/29/11
2.4
2.2
1.6
2.8
3,100
3,000
2,400
3,900
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
7.0
6.8
6.0
7.0
1st Qtr 1/24/12
2nd Qtr 6/14/12
3rd Qtr 9/28/12
4th Qtr 10/4/12
2
21
1.8
2
2,500
2,500
2,900
3,100
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
7.1
7.7
4.0
7.6
1st Qtr 2/13/13
2nd Qtr 6/19/13
3rd Qtr 9/3/13
4th Qtr 11/14/13
5.17
2.65
2.41
3.15
3,580
3,110
3,480
3,740
<1.0
2
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
46
46.9
44.9
43.9
8.1
7.51
9.3
8.39
1st Qtr 2/6/14
2nd Qtr 5/23/14
3rd Qtr 8/27/14
4th Qtr 10/30/14
7.1
6.05
1.4
2.6
3,180
2,930
3,170
3,580
<1.0
<1.0
<1.0
3.6
<1.0
<1.0
<1.0
<1.0
45.9
45.4
45
45.5
7.87
9.11
6.2
8.451 St Qtr 3/9/15 (started
pumping 1/14/15)
2nd Qtr 6/8/15
3rd Qtr 8/31/15
4th Qtr 10/19/15
<1.0
<1.0
1.44
2.6
1,840
1,650
1,060
2,070
<1.0
<1.0
<1.0
2.6
<1.0
<1.0
<1.0
<1.0
44.9
48.1
50
41.9
5.32
4.3
3.76
5.18
NA = not analyzed
Shaded indicates concentrations exceeding GWQS.
Bold and italics indicates the MDL exceeded the GWQS.
TABLE 1 (6 of 27)
Historic Summary Of Monitoring Parameters Up To The 3rd Quarter 2015
Chloroform Contamination Investigation
DUSA White Mesa Mill
Well
Sampling Event
Carbon Tetrachloride
_____(spg/L)_____
Chloroform
(70 pg/L)
Chloromethane
___(30 pg/L)___
Parameter
(GWQS)
Methylene Chloride
(5 ug/L)
Chloride
No GWQS (mg/L)
Nitrate, Nitrate + Nitrite
(10 mg/L)
TW4-3
1st Qtr 3/16/05
2nd Qtr 5/25/05
3rd Qtr 8/31/05
4th Qtr 12/7/05
NA
NA
<1.0
<1.0
<1,0
<1.0
<1.0
<1.0
NA
NA
<1.0
6.4
NA
NA
<1.0
<1.0
NA
NA
NA
26
3.5
3.7
3.5
3.3
1st Qtr 3/9/06
2nd Qtr 6/14/06
3rd Qtr 7/20/06
4th Qtr 11/8/06
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
2.3
1.6
2.2
<1.0
<1.0
<1.0
<1.0
<1.0
3.3
7.1
2.9
1.5
1st Qtr 2/28/07
2nd Qtr 6/27/07
3rd Qtr 8/15/07
4th Qtr 10/10/07
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
3.1
3.3
3.1
2.8
1st Qtr 3/28/08
2nd Qtr 6/25/08
3rd Qtr 9/10/08
4th Qtr 10/15/08
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
2.8
2.9
2.7
2.6
1st Qtr 3/4/09
2nd Qtr 6/23/09
3rd Qtr 9/14/09
4th Qtr 12/29/09
<1.0
<1.0
<1.0
<1.0
1st Qtr 2/23/10
2nd Qtr 6/14/10
3rd Qtr 8/10/10
4th Qtr 10/15/10
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<10
<10
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
2.5
2.9
2.8
2.6
2.8
3.0
3.1
3.3
1st Qtr 2/15/11
2nd Qtr 5/25/11
3rd Qtr 8/16/11
4th Qtr 11/14/11
<1.0
<1.0
<1.0
<1.0
<1.0<1.6
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
3.5
3.7
4.0
4.4
1st Qtr 1/17/12
2nd Qtr 5/31/12
3rd Qtr 8/29/12
4th Qtr 10/3/12
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
7.1
4.4
4.9
4.8
1st Qtr 2/7/13
2nd Qtr 6/29/13
3rd Qtr 9/3/13
4th Qtr 11/6/13
<1.0
<1.0
<1.0
<1.0
1st Qtr 1/22/14
2nd Qtr 5/21/14
3rd Qtr 8/13/14
4th Qtr 10/23/14
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
23.7
23.8
25
24.1
24.9
24.4
26
26.7
5.05
5.83
4.90
5.89
6,66
6.01
5.30
6.07
1st Qtr 3/11/15
2nd Qtr 6/10/15
Duplicate TW4-65
3rd Qtr 8/13/15
4th Qtr 10/21/15
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
26.2
27.5
27.5
27.4
25.6
6.64
5.71
3.94
3.88
5.37
NA = not analyzed
Shaded indicates concentrations exceeding GWQS.
TABLE 1 (7 of 27)
Historic Summary Of Monitoring Parameters Up To The 3rd Quarter 2015
Chloroform Contamination Investigation
DUSA White Mesa Mill
Well
Sampling Event
Carbon Tetrachloride
(5 pg/L)
Chloroform
(70 pg/L)
Chloromethane
(3° M9/L)
Parameter
(GWQS)
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
2nd Qtr 5/25/05
3rd Qtr 8/31/05
4th Qtr 12/7/05
NA
NA
<10
<50
3,100
2,400
3,200
2,800
NA
NA
<10
<50
NA
NA
<10
<50
NA
NA
NA
54
10.0
11.3
9.9
10.2
1st Qtr 3/9/06
2nd Qtr 6/14/06
3rd Qtr 7/20/06
4th Qtr 11/8/06
<50
<50
<50
1.7
2,900
2,600
2,850
2,670
<50
<50
<50
<1.0
<50
<50
<50
<1.0
9.5
8.6
9.7
10.1
1st Qtr 2/28/07
2nd Qtr 6/27/07
3rd Qtr 8/15/07
4th Qtr 10/10/07
1.5
1.7
1.5
1.5
2,200
2,400
2,700
2,500
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
9.0
9.4
9.5
9.5
1st Qtr 3/28/08
2nd Qtr 6/25/08
3rd Qtr 9/10/08
4th Qtr 10/15/08
4th Qtr 11/18/09
NA
<2.0
1.6
1.5
1.4
NA
2,800
2,500
2,200
2,500
<1.0
<1.0
<1.0
NA
<2.0
<1.0
<1.0
<1.0
NA
<2.0 NA NA
9.2
10.8
8.8
10.1
1st Qtr 3/4/09
2nd Qtr 6/23/09
3rd Qtr 9/14/09
4th Qtr 12/29/p?
1.2
1.2
1.1
1.1
2,200
1,800
2,000
950
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
10.2
8.2
8.4
7.61st Qtr 2/17/10
(started pumping 1/13/10)2nd Qtr 6/14/10
3rd Qtr 8/10/10
4th Qtr 10/15/10
1
1.2
1.3
1.3
1,700
1,700
2,100
1,700
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
6.6
7.6
7.3
7.1
1st Qtr 2/23/11
2nd Qtr 6/1/11
3rd Qtr 8/17/11
4th Qtr 11/16/11
<1.0
1.4
1.2
1,800
1,700
1,500
1,500
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
7.0
7.0
7.0
1st Qtr 1/23/12
2nd Qtr 6/6/12
3rd Qtr 9/4/12
4th Qtr 10/3/12
<1.0
<1.0
1.2
1
1,200
1,500
1,600
1,400
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
7.1
7.1
7.1
7.0
1st Qtr 2/11/13
2nd Qtr 6/29/13
3rd Qtr 9/3/13
4th Qtr 10/3/13
<1.0
1.2
5.3
1,460
1,330
1,380
1,360
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
39
39.6
38.8
43.9
7.36
6.30
7.22
7.84
1st Qtr 1/27/14
2nd Qtr 5/19/14
3rd Qtr 8/11/14
4th Qtr 10/21/14 <1.0
3.88
4.94
4.94
1,260
1,220
1,320
1,130
<1.0
<1.0
<1.0
7.1
<1.0
<1.0
<1.0
<1.0
37.4
47.5
40
40
7.28
5.91
5.3
7.02
1st Qtr 3/9/15
2nd Qtr 6/10/15
3rd Qtr 8/31/15
4th Qtr 10/19/15
<1.0
<1.0
<1.0
1.05 1,350
1,280
1,220
1,190
<1.0
<1.0
<1.0
1.72
<1.0
<1.0
<1.0
<1.0
37.6
41.3
45.8
38.5
7.7
6.33
6.45
6.27
NA = not analyzed
Shaded indicates concentrations exceeding GWQS.
Bold and italics indicates the MDL exceeded the GWQS.
TABLE 1 (8 of 27)
Historic Summary Of Monitoring Parameters Up To The 3rd Quarter 2015
Chloroform Contamination Investigation
DUSA White Mesa Mill
Well
Sampling Event
Carbon Tetrachloride
_____(5 M9/L)_____
Chloroform
(70pg'L)
Chloromethane
(30 pg/L)
Parameter
(GWQS)
Methylene Chloride
____(Sjig/L)____
Chloride
No GWQS (mg/L)
Nitrate, Nitrate + Nitrite
(10 mg/L)
TW4-5
1st Qtr 3/16/05
2nd Qtr 5/25/05
3rd Qtr 8/31/05
4th Qtr 12/7/05
NA
NA
<2.5
<2.5
120
113
82
63
NA
NA
5.8
2.5
NA
NA
<2.5
<2.5
NA
NA
NA
56
4.9
3.7
6.0
6.0
1st Qtr 3/9/06
2nd Qtr 6/14/06
3rd Qtr 7/20/06
4th Qtr 11/8/06
<2.5
<2.5
<1.0
<1.0
66
51
53.7
47.1
3.1
3.1
<1.0
<1.0
<2.5
<2.5
<1.0
<1.0
6.0
5.9
6.7
.2.9
7.8
7.0
7.7
. 8.2
7.4
8.7
7.9
9.3
7 9
7.5
8.3
7 5
6.8
7.1
7.0
7 2
7.0
7.2
7.5
6.0
1st Qtr 2/28/07
2nd Qtr 6/27/07
3rd Qtr 8/15/07
4th Qtr 10/10/07
<1.0
<1.0
<1.0
<1.0
35
26
9.2
9.4
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
1st Qtr 3/28/08
2nd Qtr 6/25/08
3rd Qtr 9/10/08
4th Qtr 10/15/08
<1.0
<1.0
<1.0
<1.0
11
9.3
11
10
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
1st Qtr 3/4/09
2nd Qtr 6/23/09
3rd Qtr 9/14/09
4th Qtr 12/29/09
<1.0
<1.0
<1.0
<1.0
12
13
12
8.5
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
1st Qtr 2/25/10
2nd Qtr 6/14/10
3rd Qtr 8/11/10
4th Qtr 10/15/10
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
1st Qtr 2/22/11
2nd Qtr 5/26/11
3rd Qtr 8/7/11
4th Qtr 11/16/11
(1) 12/7/11
<1.0
<1.0
<1.0
NA
<1.0
NA
10
9
10
7.9
<1.0
<1.0
<1.0
NA
<1.0
<1.0
<1.0
<1.0
NA
<1.0 NA NA
1st Qtr 1/18/12
2nd Qtr 6/6/12
3rd Qtr 9/11/12
4th Qtr 10/3/12
<1.0
<1.0
<1.0
<1.0
7.6
8.4
12
8
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
5.8
8.0
8.1
7.7
1st Qtr 2/13/13
2nd Qtr 6/13/13
3rd Qtr 9/5/13
4th Qtr 11/13/13
<1.0
<1.0
<1.0
<1.0
10.8
11.2
11.6
14.4
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
34.3
36.5
39.1
41.1
8.24
10.70
7.79
7.75
1st Qtr 1/30/14
2nd Qtr 5/22/14
3rd Qtr 8/14/14
4th Qtr 11/13/14
<1.0
<1.0
<1.0
<1.0
12.5
13.4
12.0
14.6
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
40.5
51.4
44
45.1
9.16
7.78
7.2
8.31
1st Qtr 3/12/15
Duplicate TW4-70
2nd Qtr 6/10/15
3rd Qtr 9/3/15
4th Qtr 10/28/15
<1.0
<1.0
<1.0
<1.0
<1.0
13.8
13.8
13.3
12.9
__11
<1.0
<1.0
1.07
<1.0
<1.0
<1.0
<1,0
<1.0
<1.0
<1.0
45.1
46.4
47.3
52.2
43.6
9.32
8.81
7.08
8.1
8.03
(1) VOCs were resampled because laboratory missed holding time. NA = not analyzedShaded indicates concentrations exceeding GWQS.
TABLE 1 (9 of 27)
Historic Summary Of Monitoring Parameters Up To The 3rd Quarter 2015
Chloroform Contamination Investigation
DUSA White Mesa Mill
Well
Sampling Event
Carbon Tetrachloride
(5 ug/L)
Chloroform
(70 ug/L)
Chloromethane
(30 ug/L)
Parameter
(GWQS)
Methylene Chloride
____l§Mk)____
Chloride
No GWQS (mg/L)
Nitrate, Nitrate + Nitrite
_____(10 mg/L)_____
TW4-6
1st Qtr 3/16/05
2nd Qtr 5/25/05
3rd Qtr 8/31/05
4th Qtr 12/7/05
NA
NA
<1.0
<1.0
<1.0
2.5
10
17
NA
NA
2.8
1.3
NA
NA
<1.0
<1.0
NA
NA
NA
32
0.2
0
0.8
0.9
1.2
1.0
0.6
1.4
1.8
0.6
0.7
0,8..1.1
0.9
1.1
1.0
2.2
2.7
5.0
6.1
1.8
2.5
3.9
4,3 6.7
0.3
0.3
0.8
NA
0.8 6.7
0.2
0.1
...Q,2 6.2
0.2
0.2
1 5 6.2
0.3
4.2
6.9
1st Qtr 3/9/06
2nd Qtr 6/14/06
3rd Qtr 7/20/06
4th Qtr 11/8/06
<1.0
<1.0
<1.0
<1.0
31
19
11
42.8
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
1st Qtr 2/28/07
2nd Qtr 6/27/07
3rd Qtr 8/15/07
4th Qtr 10/10/07
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
1st Qtr 3/28/08
2nd Qtr 6/25/08
3rd Qtr 9/10/08
4th Qtr 10/15/08
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
1st Qtr 3/11/09
2nd Qtr 6/23/09
3rd Qtr 9/14/09
4th Qtr 12/29/09
<1.0
<1.0
<10
<1.0
81
120
280
250
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
1st Qtr 2/25/10
2nd Qtr 6/14/10
3rd Qtr 8/11/10
4th Qtr 10/15/10
<1.0
<1.0
<1.0
<1.0
1000
590
630
420
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
1st Qtr 2/23/11
2nd Qtr 5/26/11
3rd Qtr 8/17/11
4th Qtr 11/16/11
<1) 12/7/11
(2) 11/16/11
<1.0
<1.0
<1.0
NA
<1.0
<1.0
NA
47
9.6
16
21
50
<1.0
<1.0
<1.0
NA
<1.0
<1.0
<1.0
<1.0
<1.0
NA
<1.0
<1.0
NA
1st Qtr 1/18/12
2nd Qtr 6/13/12
3rd Qtr 9/11/12
4th Qtr 10/3/12
<1.0
<1.0
<1.0
<1.0
38
4.7
6.9
9
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0 41
1st Qtr 2/13/13
2nd Qtr 6/13/13
3rd Qtr 9/5/13
4th Qtr 11/13/13
<1.0
<1.0
<1.0
<1.0
6.89
4.86
5.93
5.51
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
40.4
37.9
40.6
40.2
1st Qtr 1/29/14
2nd Qtr 5/22/14
3rd Qtr 8/14/14
(3)3rd Qtr 9/24/14
4th Qtr 10/29/14
<1.0
<1.0
<1.0
<1.0
<1.0
5.7
10.3
202
260
723
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
40.6
37
40
NA
41.1
NA
1st Qtr 3/12/15
2nd Qtr 6/10/15
3rd Qtr 9/10/15
4th Qtr 10/29/15
<1.0
<1.0
<1.0
<1.0
1,180
1,040
1,040
843
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
41.2
41.6
47
40.2
5.3
5.9
6.8
5.6,
(1) VOCs were resampled because laboratory missed holding ti
(2) Results of the TW4-70 the duplicate sample for TW4-6.
(3) Reanalyzed for VOCs only.
NA = not analyzed
Shaded indicates concentrations exceeding GWQS.
TABLE 1 (10 of 27)
Historic Summary Of Monitoring Parameters Up To The 3rd Quarter 2015
Chloroform Contamination Investigation
DUSA White Mesa Mill
Well
Sampling Event
Carbon Tetrachloride
(5 pg/L)
Chloroform
(70 pg/L)
Chloromethane
___(30 H9'L)
Parameter
(GWQS)
Methylene Chloride
(5 Mg/L)
Chloride
No GWQS (mg/L)
Nitrate, Nitrate + Nitrite
(10 mg/L)
TW4-7
1st Qtr 3/16/05
2nd Qtr 5/25/05
3rd Qtr 8/31/05
4th Qtr 12/7/05
NA
NA
<10
<50
3,100
2,700
3,100
2,500
NA
NA
<10
<50
NA
NA
<10
<50
NA
NA
NA
52
5.2
5.4
5.2
5.3
1st Qtr 3/9/06
2nd Qtr 6/14/06
3rd Qtr 7/20/06
4th Qtr 11/8/06
<50
<50
<50
1.5
1,900
2,200
2,140
2,160
<50
<50
<50
<1.0
<50
<50
<50
<1.0
1
4.5
4.7
4.6
1st Qtr 2/28/07
2nd Qtr 6/27/07
3rd Qtr 8/15/07
4th Qtr 10/10/07
1.1
1.5
1.4
1.2
1,830
2,600
2,300
1,900
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
6
5.1
4.7
4.7
1st Qtr 3/28/08
2nd Qtr 6/25/08
3rd Qtr 9/10/08
4th Qtr 10/15/08
11/18/08
NA
<2.0
1.3
1.3
1.4
NA
2,200
1,800
1,600
2,500
<1.0
<1.0
<1.0
NA
<2.0
<1.0
<1.0
<1.0
NA
<2.0 NA NA
4.2
4.8
4.16
4.01
1st Qtr 3/11/09
2nd Qtr 6/23/09
3rd Qtr 9/14/09
4th Qtr 12/29/09
<1.0
<1.0
1.2
1
1,800
1,400
1,500
1,300
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
3.7
3.8
4.1
4.2
1st Qtr 3/3/10
2nd Qtr 6/14/10
3rd Qtr 8/11/10
4 th Qtr 10/15/10
<1.0
<1.0
<1.0
1,200
1,100
1,500
1,100
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
3.8
3.9
3.9
4
1st Qtr 2/23/11
2nd Qtr 6/1/11
3rd Qtr 8/18/11
4th Qtr 11/29/11
<1.0
<1.0
<1.0
<1.0
1,300
1,200
1,200
1,000
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
3.6
4.0
4.1
3.8
1st Qtr 1/19/12
2nd Qtr 6/14/12
3rd Qtr 9/13/12
4th Qtr 10/4/12
<1.0
<1.0
<1.0
<1.0
1,000
790
870
940
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
3.9
4.0
3.8
3.8
1st Qtr 2/13/13
2nd Qtr 6/18/13
3rd Qtr 9/12/13
4th Qtr 11/14/13
<1.0
<1.0
<1.0
<1.0
1st Qtr 2/5/14
2nd Qtr 5/22/14
3rd Qtr 8/27/14
4th Qtr 10/30/14
<1.0
<1.0
940
953
1,040
1,050
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
5.41
4.78
946
847
857
926
<1.0
<1.0
1.5
<1.0
<1.0
<1.0
<1.0
<1.0
37.7
39.3
36.4
37.2
38.2
37.7
39
40.2
3.51
4
4.17
4.13
4.24
4.19
2.9
3.68
1st Qtr 3/18/15
2nd Qtr 6/11/15
3rd Qtr 9/10/15
4th Qtr 10/29/15
<1.0
<1.0
<1.0
<1.0
942
950
897
847
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
40.4
42.1
46.7
40.6
4.25
2.62
4.72
3.49
NA = not analyzed
Shaded indicates concentrations exceeding GWQS.
Bold and italics indicates the MDL exceeded the GWQS.
TABLE 1 (11 of 27)
Historic Summary Of Monitoring Parameters Up To The 3rd Quarter 2015
Chloroform Contamination Investigation
DUSA White Mesa Mill
Well
Sampling Event
Carbon Tetrachloride
_____(sjig/y_____
Chloroform
(70 pg/L)
Chloromethane
___(30 pg/L)
Parameter
(GWQS)
Methylene Chloride
_____(Si»g/L)____
Chloride
No GWQS (mg/L)
Nitrate, Nitrate + Nitrite
(10 mg/L)
TW4-8
1st Qtr 3/16/05
2nd Qtr 5/25/05
3rd Qtr 8/31/05
4th Qtr 12/7/05
NA
NA
<1.0
<1.0
<1.0
<1.0
10
1.1
NA
NA
<1.0
1.7
NA
NA
NA
<1.0
NA
NA
NA
41
<0.1
<1.0
<1.0
0.2
1st Qtr 3/9/06
2nd Qtr 6/14/06
3rd Qtr 7/20/06
4th Qtr 11/8/06
<1.0
<1.0
<1.0
<1.0
1.3
1.8
2.1
1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
39
37
39
40
<1.0
<1
0.3
0.1
1st Qtr 2/28/07
2nd Qtr 6/27/07
3rd Qtr 8/15/07
4th Qtr 10/10/07
<1.0
<1.0
<1.0
<1.0
2.5
2.5
1.5
3.5
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
0.7
0.2
0.56.i1st Qtr 3/28/08
2nd Qtr 6/25/08
3rd Qtr 9/10/08
4th Qtr 10/15/08
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<0.05
<0.05
1st Qtr 3/4/09
2nd Qtr 6/23/09
3rd Qtr 9/14/09
4th Qtr 12/17/09
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<0.1
<0.1
<0.1
<0.1
1st Qtr 2/24/10
2nd Qtr 6/14/10
3rd Qtr 8/18/10
4th Qtr 10/15/10
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0 <1.0
<1.0
<1.0
<1.0
<1.0
57
42
45
46
<0.1
<0.1
<0.1
0.1
1st Qtr 2/16/11
2nd Qtr 5/25/11
3rd Qtr 8/16/11
4th Qtr 11/16/11
(1)12/7/11
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0 NA
<0.1
NA
0.1
0.1
0.2
1st Qtr 1/18/12
2nd Qtr 5/13/12
3rd Qtr 8/29/12
4th Qtr 10/3/12
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0 <0.1
0.3
0.2
0.1
1st Qtr 2/7/13
2nd Qtr 5/30/13
3rd Qtr 9/5/13
4th Qtr 11/7/13
<1.0
<1.0
<1.0
<1.0
1st Qtr 1/23/14
(2)2/6/2014
2nd Qtr 5/22/14
3rd Qtr 8/27/14
4th Qtr 10/29/14
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
63.8
100.0
122.0
107
191
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
46.6
45.5
47.5
46.1
<0.1
<0.1
48.5
46.5
53
47
46.7
0.41
0.1
0.166
0.166
0.538
0.6
0.914
1st Qtr 3/12/15
2nd Qtr 6/11/15
3rd Qtr 9/10/15
4th Qtr 10/29/15
<1.0
<1.0
<1.0
<1.0
961
981
747
770
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
49.6
53
59.6
52
2.3
1.88
1.96
2.2
(1) VOCs were resampled because laboratory missed holding time.
(2) Resampled to verify chloroform concentration that was collected on 1/23/14.
NA = not analyzed
Shaded indicates concentrations exceeding GWQS.
TABLE 1 (12 of 27)
Historic Summary Of Monitoring Parameters Up To The 3rd Quarter 2015
Chloroform Contamination Investigation
DUSA White Mesa Mill
Well
Sampling Event
Carbon Tetrachloride
_____ISjjfl/Lj_____
Chloroform
(70 pg/L)
Chloromethane
___(30 pg/L)___
Parameter
(GWQS)
Methylene Chloride
____(5 M9'L)____
Chloride
No GWQS (mg/L)
Nitrate, Nitrate + Nitrite
(10 mg/L)
TW4-9
1st Qtr 3/16/05
2nd Qtr 5/25/05
3rd Qtr 8/31/05
4th Qtr 12/7/05
NA
NA
<1.0
<1.0
3.8
1.2
<1.0
<1.0
NA
NA
<1.0
2.9
NA
NA
<1.0
<1.0
NA
NA
NA
42
1.3
1.3
1.3
1.3
1st Qtr 3/9/06
2nd Qtr 6/14/06
3rd Qtr 7/20/06
4th Qtr 11/8/06
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
19
2.6
2.7
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
1.5
1.5
0.9
0.7
1st Qtr 2/28/07
2nd Qtr 6/27/07
3rd Qtr 8/15/07
4th Qtr 10/10/07
<1.0
<1.0
<1.0
<1.0
<1.0
21
9.5
8.7
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
0.6
1.3
1.8
2
1st Qtr 3/28/08
2nd Qtr 6/25/08
3rd Qtr 9/10/08
4th Qtr 10/15/08
<1.0
<1.0
<1.0
<1.0
1.3
1
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
2.1
2.3
2.79
1.99
1st Qtr 3/4/09
2nd Qtr 6/23/09
3rd Qtr 9/14/09
4th Qtr 12/17/09
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
2.5
2.3
2.5
1.7
1st Qtr 2/23/10
2nd Qtr 6/14/10
3rd Qtr 8/13/10
4th Qtr 10/15/10
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
1.4
1.5
1.2
1.8
1.3
3.4
4
2.3
1st Qtr 2/17/11
2nd Qtr 5/25/11
3rd Qtr 8/16/11
4th Qtr 11/16/11
(1) 12/7/11
<1.0
<1.0
<1.0
NA
<1.0
<1.0
<1.0
<1.0
NA
<1.0
<1.0
<1.0
<1.0
NA
<1.0
<1.0
<1.0
<1.0
NA
<1.0 NA
1st Qtr 1/18/12
2nd Qtr 5/31/12
3rd Qtr 8/30/12
4th Qtr 10/3/12
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
2.3
4.0
3.9
3.8
1st Qtr 2/7/13
2nd Qtr 5/30/13
3rd Qtr 9/5/13
4th Qtr 11/7/13
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
20.6
21.4
22.7
23.6
4.49
4.49
4.03
4.87
1st Qtr 1/29/14
2nd Qtr 5/22/14
3rd Qtr 8/14/14
4th Qtr 10/29/14
<1.0
<1.0
<1.0
<1.0
<1.0
6.9
47
101
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
4.36
3.44
2.7
4.29
1st Qtr 3/12/15
2nd Qtr 6/11/15
3rd Qtr 9/3/15
4th Qtr 10/28/15
<1.0
<1.0
<1.0
<1.0
53.5
35.1
48
68.4
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
29.5
35.3
39.3
29.2
3.28
1.83
1.44
2.89
(1) VOCs were resampled because laboratory missed holding time.
NA = not analyzed
Shaded indicates concentrations exceeding GWQS.
TABLE 1 (13 of 27)
Historic Summary Of Monitoring Parameters Up To The 3rd Quarter 2015
Chloroform Contamination Investigation
DUSA White Mesa Mill
Well
Sampling Event
Carbon Tetrachloride
_____(5 MQ/L)_____
Chloroform
(70pg/L)
Chloromethane
___(30 pg/L)__
Parameter
(GWQS)
Methylene Chloride
_____(5 pg'L)____
Chloride
No GWQS (mg/L)
Nitrate, Nitrate + Nitrite
(10 mg/L)
TW4-10
1st Qtr 3/16/05
2nd Qtr 5/25/05
3rd Qtr 8/31/05
4th Qtr 12/7/05
NA
NA
<2.5
<2.5
140
62
110
300
NA
NA
<2.5
6.2
NA
NA
<2.5
<2.5
NA
NA
NA
52
1.6
0.8
1.1
3.3
1st Qtr 3/9/06
2nd Qtr 6/14/06
3rd Qtr 7/20/06
4th Qtr 11/8/06
<5.0
<5.0
<5.0
<1.0
190
300
504
452
<5.0
<5.0
<5.0
1.6
<5.0
<5.0
<5.0
<1.0
2.4
3.5
6.8
5.7
1st Qtr 2/28/07
2nd Qtr 6/27/07
3rd Qtr 8/15/07
4th Qtr 10/10/07
<1.0
<1.0
<1.0
<1.0
500
350
660
470
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
7.3
5.1
7.3
6.7
1st Qtr 3/28/08
2nd Qtr 6/25/08
3rd Qtr 9/10/08
4th Qtr 10/15/08
11/18/08
<1.0
<1.0
<1.0
NA
<2.0
NA
620
720
660
1,200
<1.0
<1.0
<1.0
NA
<2.0
<1.0
<1.0
<1.0
NA
<2.0 NA NA
7.3
9.9
9.23
10.5
1st Qtr 3/11/09
2nd Qtr 6/23/09
3rd Qtr 9/14/09
4th Qtr 12/22/09
<1.0
<1.0
<1.0
<1.0
1,100
1,200
910
300
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
11.6
9.8
8.1
3.8
1st Qtr 3/3/10
2nd Qtr 6/14/10
3rd Qtr 8/12/10
4th Qtr 10/15/10
<1.0
<1.0
<1.0
<1.0
460
220
100
1,100
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
5.0
1.6
0.8
11.0
1st Qtr 2/23/11
2nd Qtr 6/14/11
3rd Qtr 8/17/11
4th Qtr 11/16/11
<1.0
<1.0
<1.0
<1.0
620
280
180
110
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
9.0
3.3
1.9
1.1
1st Qtr 1/19/12
2nd Qtr 6/14/12
3rd Qtr 9/12/12
4th Qtr 10/3/12
<1.0
<1.0
<1.0
<1.0
76
79
130
140
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
0.9
0.8
1.0
1.6
1st Qtr 2/13/13
2nd Qtr 6/13/13
3rd Qtr 9/12/13
4th Qtr 11/14/13
<1.0
<1.0
<1.0
<1.0
154
486
1,126
1,380
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
49.1
51.5
67.9
70.9
1.2
5.6
13.0
16.0
1st Qtr 1/29/14
2nd Qtr 5/23/14
3rd Qtr 8/27/14
4th Qtr 10/30/14
<1.0
<1.0
<1.0
5.16 1,260
1,110
1,060
1,220
<1.0
<1.0
<1.0
1.5
<1.0
<1.0
<1.0
<1.0
73
77.3
74
75.2
16.8
13.9
9.8
13.2
1st Qtr 3/18/15
2nd Qtr 6/11/15
3rd Qtr 9/10/15
4th Qtr 10/29/15
<1.0
<1.0
<1.0
<1.0
1,210
1,240
1,280
1,350
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
78.6
75
89.5
79.9
15.0
11.4
14.0
13.5
NA = not analyzed
Shaded indicates concentrations exceeding GWQS.
TABLE 1 (14 of 27)
Historic Summary Of Monitoring Parameters Up To The 3rd Quarter 2015
Chloroform Contamination Investigation
DUSA White Mesa Mill
Well
Sampling Event
Carbon Tetrachloride
_____(s vaM
Chloroform
(70 |ig/L)
Chloromethane
___(30JJS/L)___
Parameter
(GWQS)
Methylene Chloride
_____(S H9'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
2nd Qtr 5/25/05
3rd Qtr 8/31/05
4th Qtr 12/7/05
NA
NA
<10
<100
4,400
3,590
4,400
4,400
NA
NA
<10
<100
NA
NA
<10
<100
NA
NA
NA
58
8.7
10.3
9.4
9.4
1st Qtr 3/9/06
2nd Qtr 6/14/06
3rd Qtr 7/20/06
4th Qtr 11/8/06
<50
<50
<50
1.7
4,400
4,300
4,080
3,660
<50
<50
<50
<50
<50
<50
2.7 1.3
9.2
10.0
10.0
10.0
1st Qtr 2/28/07
2nd Qtr 6/27/07
3rd Qtr 8/15/07
4th Qtr 10/10/07
1.3
1.6
1.7
1.6
3,600
3,800
4,500
4.400
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
1.6
1.2
10.1
10.6
10.2
9.8 ..7.7
7.3
7.9
9.5
1st Qtr 3/28/08
2nd Qtr 6/25/08
3rd Qtr 9/10/08
4th Qtr 10/15/08
11/18/08
<1.0
<1.0
<1.0
NA
<2.0
NA
340
640
900
1,000
<1.0
<1.0
<1.0
NA
<2.0
<1.0
<1.0
<1.0
NA
<2.0 NA NA
1st Qtr 3/11/09
2nd Qtr 6/23/09
3rd Qtr 9/14/09
4th Qtr 12/29/09
<1.0
<1.0
<1.0
<1.0
1,000
980
1,000
860
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
7.3
6.8
7.0
6.6
1st Qtr 3/3/10
2nd Qtr 6/14/10
3rd Qtr 8/12/10
4th Qtr 10/15/10
<1.0
<1.0
<1.0
<1.0
820
820
800
720
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
6.8
6.9
6.7
6.4
1st Qtr 2/23/11
2nd Qtr 6/1/11
3rd Qtr 8/17/11
4th Qtr 11/16/11
<1.0
<1.0
<1.0
<1.0
1,000
930
820
1500
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
6.5
7.3
7.1
7.1
1st Qtr 1/24/12
2nd Qtr 6/13/12
3rd Qtr 9/13/12
4th Qtr 10/3/12
<1.0
<1.0
<1.0
<1.0
610
660
740
730
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
6.8
6.7
3.0
7.0
1st Qtr 2/13/13
2nd Qtr 6/18/13
3rd Qtr 9/12/13
4th Qtr 11/13/13
<1.0
<1.0
<1.0
3.23 867
788
865
874
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
47.3
49.3
46.6
46.7
6.8
7.4
7.8
8.01
1st Qtr 2/5/14
2nd Qtr 5/23/14
3rd Qtr 8/27/14
4th Qtr 10/29/14
<1.0
<1.0
<1.0
5.19 785
751
719
803
<1.0
<1.0
<1.0
1.2
<1.0
<1.0
<1.0
<1.0
48.5
51.6
48
56.4
8.47
6.92
5.4
7.331st Qtr 3/9/15 (Started
pumping 1/14/15)2nd Qtr 6/11/15
3rd Qtr 8/31/15
4th Qtr 10/29/15
<1.0
<1.0
<1.0
1.24 2,450
2,710
1,120
2730
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
49.8
62.2
73.1
55.3
8.72
8.48
9.61
7.5
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 27)
Historic Summary Of Monitoring Parameters Up To The 3rd Quarter 2015
Chloroform Contamination Investigation
DUSA White Mesa Mill
Well
Sampling Event
Carbon Tetrachloride
(5 pg/L)
Chloroform
(70 M9/L)
Chloromethane
(3° M9'l)
Parameter
(GWQS)
Methylene Chloride
(5 pg/L)
Chloride
No GWQS (mg/L)
Nitrate, Nitrate + Nitrite
(10 mg/L)
TW4-12
1st Qtr 3/16/05
2nd Qtr 5/25/05
3rd Qtr 8/31/05
4th Qtr 12/7/05
NA
NA
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
NA
NA
5.8
1.0
NA
NA
<1.0
<1.0
NA
NA
NA
19
1.4
1.6
1.5
1.4
1st Qtr 3/9/06
2nd Qtr 6/14/06
3rd Qtr 7/20/06
4th Qtr 11/8/06
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
2.6
1.4
1.4
<1.0
<1.0
<1.0
<1.0
<1.0
1.3
1.4
1.4
1.4
1st Qtr 2/28/07
2nd Qtr 6/27/07
3rd Qtr 8/15/07
4th Qtr 10/10/07
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
1.5
1.5
1.4
1.4
1st Qtr 3/28/08
2nd Qtr 6/25/08
3rd Qtr 9/10/08
4th Qtr 10/15/08
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
1.6
2.7
2.7
2.5
1st Qtr 3/11/09
2nd Qtr 6/23/09
3rd Qtr 9/14/09
4th Qtr 12/16/09
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1-0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
2.4
3.8
5.1
3.6
1st Qtr 2/23/10
2nd Qtr 6/14/10
3rd Qtr 8/10/10
4th Qtr 10/15/10
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
4.0
11.0
9.0
8.0
1st Qtr 2/15/11
2nd Qtr 5/25/11
3rd Qtr 8/16/11
4th Qtr 11/15/11
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
6.5
7.0
6.8
8.0
1st Qtr 1/17/12
2nd Qtr 5/31/12
3rd Qtr 8/29/12
4th Qtr 10/3/12
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
7.7
10.0
13.0
13.0
1st Qtr 2/13/13
2nd Qtr 5/29/13
3rd Qtr 8/29/13
4th Qtr 11/6/13
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
36.7
38.6
41.7
41.4
12.6
14.2
17.4
16.4
1st Qtr 1/22/14
2nd Qtr 5/21/14
3rd Qtr 8/27/14
4th Qtr 10/23/14
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
41.6
40.2
47
50.2
18.4
17.0
13.0
16.1
1st Qtr 3/11/15
2nd Qtr 6/10/15
3rd Qtr 9/2/15
4th Qtr 10/21/15
Deplicate TW4-65
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
50.6
56
60.2
51
51.3
19.2
18.8
16.4
18.0
18.9
NA = not analyzed
Shaded indicates concentrations exceeding GWQS.
TABLE 1 (16 of 27)
Historic Summary Of Monitoring Parameters Up To The 3rd Quarter 2015
Chloroform Contamination Investigation
DUSA White Mesa Mill
Well
Sampling Event
Carbon Tetrachloride
_____(spg/L)_____
Chloroform
(70 pg/L)
Chloromethane
___(3Q pg(D
Parameter
(GWQS)
Methylene Chloride
____(Spg/L)____
Chloride
No GWQS (mg/L)
Nitrate, Nitrate + Nitrite
(10 mg/L)
TW4-13
1 st Qtr 3/16/05
2nd Qtr 5/25/05
3rd Qtr 8/31/05
4th Qtr 12/7/05
NA
NA
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
NA
NA
<1.0
3.1
NA
NA
<1.0
<1.0
NA
NA
NA
69
4.2
4.3
46
4.3
1st Qtr 3/9/06
2nd Qtr 6/14/06
3rd Qtr 7/20/06
4th Qtr 11/8/06
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
1.7
1.4
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
4.2
4.9
4.3
0.8
1st Qtr 2/28/07
2nd Qtr 6/27/07
3rd Qtr 8/15/07
4th Qtr 10/10/0 7
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
4.0
4.6
4.4
4.1
1st Qtr 3/28/08
2nd Qtr 6/25/08
3rd Qtr 9/10/08
4th Qtr 10/15/08
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
3.8
4.2
4.3
4.6
1st Qtr 3/4/09
2nd Qtr 6/23/09
3rd Qtr 9/14/09
4th Qtr 12/16/09
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
3.7
1.2
4.7
4.1
1st Qtr 2/24/10
2nd Qtr 6/14/10
3rd Qtr 8/10/10
4th Qtr 10/15/10
<1.0
<1,0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0<1.6
<1.0
<1.0
4.3
5.2
5.6
5.8
1st Qtr 2/15/11
2nd Qtr 5/25/11
3rd Qtr 8/16/11
4th Qtr 11/15/11
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0<1.6
<1.0
<1.0
5.5
6.4
5.2
5.9
1st Qtr 1/17/12
2nd Qtr 5/31/12
3rd Qtr 8/29/12
4thi Qtr 10/3/12
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
5.5
6.0
6.2
5.9
1st Qtr 2/13/13
2nd Qtr 5/29/13
3rd Qtr 8/29/13
4th Qtr 11/6/13
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
59.3
56
63.5
58.5
6.31'"""6.8
7.16
6.48
1 St Qtr 1/22/14
2nd Qtr 5/21/14
3rd Qtr 8/13/14
4th Qtr 10/23/14
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
63.1
56.1
62
66.1
7.09
5.99
4.8
6.28
1st Qtr 3/11/15
2nd Qtr 6/10/15
3rd Qtr 9/2/15
4th Qtr 10/21/15
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
66.4
70.3
76.5
65.5
7.09
6.32
5.7
5.78
NA = not analyzed
Shaded indicates concentrations exceeding GWQS.
TABLE 1 (17 of 27)
Historic Summary Of Monitoring Parameters Up To The 3rd Quarter 2015
Chloroform Contamination Investigation
DUSA White Mesa Mill
Well
Sampling Event
Carbon Tetrachloride
_____(5 H9/L)_____
Chloroform
(70 iig/L)
Chloromethane
___(30 M9/L)___
Parameter
(GWQS)
Methylene Chloride
____(s Mg/L)____
Chloride
No GWQS (mg/L)
Nitrate, Nitrate + Nitrite
(10 mg/L)
TW4-14
1st Qtr 3/16/05
2nd Qtr 5/25/05
3rd Qtr 8/31/05
4th Qtr 12/7/05
NS
NS
NS
NS
NS
NS
NS
NS
NS
NS
NS
NS
NS
NS
NS
NS
NS
NS
NS
NS
NS
NS
NS
NS
1st Qtr 3/9/06
2nd Qtr 6/14/06
3rd Qtr 7/20/06
4th Qtr 11/8/06
NS
NS
NS
<1.0
NS
NS
NS
NS
NS
NS
NS
<1.0
NS
NS
NS
<1.0
NS
NS
NS
NS
NS
NS
37 2.4
1st Qtr 2/28/07
2nd Qtr 6/27/07
3rd Qtr 8/15/07
4th Qtr 10/10/07
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
2.3
1.4
1.1
0.8
04
1.6
1.38
0.76
1st Qtr 3/28/08
2nd Qtr 6/25/08
3rd Qtr 9/10/08
4th Qtr 10/15/08
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
1st Qtr 3/4/09
2nd Qtr 6/23/09
3rd Qtr 9/14/09
4th Qtr 12/16/09
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1,0
<1.0
<1.0
<1.0
<1,0
<1.0
<1.0
1.6
1.4
1.5
1.4
1st Qtr 3/3/10
2nd Qtr 6/14/10
3rd Qtr 8/10/10
4th Qtr 10/15/10
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1,0
<1.0
2.5
2.9
2.8
2.9
1st Qtr 2/15/11
2nd Qtr 6/14/11
3rd Qtr 8/16/11
4th Qtr 11/15/11
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1,0<ip:
<1.0
1.8
1.4
2,6
1.7
1st Qtr 1/17/12
2nd Qtr 6/14/12
3rd Qtr 8/29/12
4th Qtr 10/3/12
<1.0
<1,0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<10
<1.0
<1.0
1.9
3.3
3.9
3.9
1st Qtr 2/7/13
2nd Qtr 5/29/13
3rd Qtr 8/29/13
4th Qtr 11/6/13
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1,0<1.6
<1.0
<1.0
35.2
38.6
37.6
36.5
4,6
4.4
4.51
4.81
1st Qtr 1/22/14
2nd Qtr 5/21/14
3rd Qtr 8/13/14
4th Qtr 10/23/14
<1.0
<1.0
<1.0
<10
<1.0
<1.0
<1,0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0<1,6
<1.0
35.5
32.5
38
38.9
5.92
4.87
...4,1
5.22
1st Qtr 3/12/15
2nd Qtr 6/10/15
3rd Qtr 9/3/15
4th Qtr 10/23/15
<1.0
<1.0
<1.0
<1.0
<1.0
1.7
1.82
1.46
<1.0
<1.0
<1.0
<1.0
<1.0
<1.6
<1.0
<1.0
40.1
41.8
42.4
40.6
5.22
3.55
2.77
2.45
NS = not sampled
Shaded indicates concentrations exceeding GWQS.
TABLE 1 (18 of 27)
Historic Summary Of Monitoring Parameters Up To The 3rd Quarter 2015
Chloroform Contamination Investigation
DUSA White Mesa Mill
Well
Sampling Event
Carbon Tetrachloride
_____(S H9'l)_____
Chloroform
(70 pg/L)
Chloromethane
___(30 jig/L)___
Parameter
(GWQS)
Methylene Chloride
_____(5 M9'L)____
Chloride
No GWQS (mg/L)
Nitrate, Nitrate + Nitrite
(10 mg/L)
TW4-16
1st Qtr 3/16/05
2nd Qtr 5/25/05
3rd Qtr 8/31/05
4th Qtr 12/7/05
NA
NA
<1.0
<1.0
240
212
85
14
NA
NA
NA
NA
3.2
2.6
43
5.9
NA
NA
NA
<0.1
<0.1
<0.1
64 1.4
1st Qtr 3/9/06
2nd Qtr 6/14/06
3rd Qtr 7/20/06
4th Qtr 11/8/06
<1.0
<1.0
<1.0
<1.0
39
13
5.2
13.6
1.1
24
<1.0
<1.0
21
8.9
2.7
9.2
3
1.9
2.7
5.6
1st Qtr 2/28/07
2nd Qtr 6/27/07
3rd Qtr 8/15/07
4th Qtr 10/10/07
<1.0
<1.0
<1.0
<1.0
8.7
2.6
7-1
1.4
<1.0
<1.0
<1.0
<1.0
6.6
1.8
5.1
1
12.3
9.9
5.4
4.4
1st Qtr 3/28/08
2nd Qtr 6/25/08
3rd Qtr 9/10/08
4th Qtr 10/15/08
<1.0
<1.0
<1.0
<1.0
<1.0
11
10
3.9
<1.0
<1.0
<1.0
<1.0
<1.0
26
14
6.6
<0.1
1.5
10.5
9.8
1st Qtr 3/4/09
2nd Qtr 6/23/09
3rd Qtr 9/14/09
4th Qtr 12/17/09
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
9.6
8 9
8.8
5.2
1st Qtr 2/24/10
2nd Qtr 6/14/10
3rd Qtr 8/24/10
4th Qtr 10/15/10
<1.0
<1.0
<1.0
<1.0
<1.0
2.1
4.3
3
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
4.2
4.7
4.6
3.3
7
5
1.7
0.4
1st Qtr 2/22/11
2nd Qtr 5/26/11
3rd Qtr 8/17/11
4th Qtr 11/16/11
(1) 12/7/11
<1.0
<1.0
<1.0
NA
<1.0
15
16
9.2
NA
<1.0
<1.0
<1.0
<1.0
NA
<1.0
<1.0
<1.0
<1.0
NA
1.4 NA
1st Qtr 1/18/12
2nd Qtr 5/26/12
3rd Qtr 8/30/12
4th Qtr 10/3/12
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
1.7
<1.0
<1.0
<1.0
<0.1
<0.1
<0.1
0.1
1st Qtr 2/7/13
2nd Qtr 5/30/13
3rd Qtr 9/5/13
4th Qtr 11/7/13
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
13.4
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
4.21
58.1
49.8
54.4
56.6
<0.1
<0.1
<0.1
1.4
1st Qtr 1/29/14
2nd Qtr 5/22/14
3rd Qtr 8/14/14
(2)3rd Qtr 9/24/14
4th Qtr 10/29/14
<1.0
<1.0
<1.0
<1.0
<1.0
6.93
14.6
229
371
387
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
66.8
80.7
80
NA
92.1
3.2
4.9
5.1
NA
8.4
1st Qtr 3/12/15
2nd Qtr 6/11/15
3rd Qtr 9/3/15
4th Qtr 10/28/15
<1.0
<1.0
<1.0
<1.0
153
65.3
82
112
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
65
61
65.8
58.3
4.3
1.06
1.2
1.7
(1) VOCs were resampled because laboratory missed holding time.
(2) VOCs were resampled
NA = not analyzedShaded indicates concentrations exceeding GWQS.
TABLE 1 (19 of 27)
Historic Summary Of Monitoring Parameters Up To The 3rd Quarter 2015
Chloroform Contamination Investigation
DUSA White Mesa Mill
Well
Sampling Event
Carbon Tetrachloride
(5 pg/L)
Chloroform
(70 pg/L)
Chloromethane
(30 pg/L)
Parameter
(GWQS)
Methylene Chloride
(5 ug/L)
Chloride
No GWQS (mg/L)
Nitrate, Nitrate + Nitrite
(10 mg/L)
TW4-18
1st Qtr 3/16/05
2nd Qtr 5/25/05
3rd Qtr 8/31/05
4th Qtr 12/7/05
NA
NA
<1.0
<1.0
38
29.8
39
14
NA
NA
2.8
1.1
NA
NA
<1.0
<1.0
NA
NA
NA
41
14.1
12.9
13.3
7.3
1st Qtr 3/9/06
2nd Qtr 6/14/06
3rd Qtr 7/20/06
4th Qtr 11/8/06
<1.0
<1.0
<1.0
<1.0
12
12
10.8
12.5
1.6
2.7
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
5.9
4.7
6.1
5.7
1st Qtr 2128107
2nd Qtr 6/27/07
3rd Qtr 8/15/07
4th Qtr 10/10/07
<1.0
<1.0
<1.0
<1.0
9.2
8
8.9
7.4
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
5.1
49
5.0
4.4
1st Qtr 3/28/08
2nd Qtr 6/25/08
3rd Qtr 9/10/08
4th Qtr 10/15/08
<1.0
<1.0
<1.0
<1.0
6.4
5.7
8
9.4
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
0.7
46
4.9
5.21st Qtr 3/4/09
2nd Qtr 6/23/09
3rd Qtr 9/14/09
4th Qtr 12/22/09
<1.0
<1.0
<1.0
<1.0
11
16
13
8.2
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
5.2
6.2
5.9
5.4
1st Qtr 2/24/10
2nd Qtr 6/14/10
3rd Qtr 8/12/10
4th Qtr 10/15/10
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
5.1
9.0
9.0
10.0
1st Qtr 2/22/11
2nd Qtr 5/26/11
3rd Qtr 8/17/11
4th Qtr 11/16/11
(1) 12/7/11
<1.0
<1.0
<1.0
NA
<1.0
NA
<1.0
<1.0
<1.0
NA
<1.0
<1.0
<1.0
<1.0
NA
<1.0
52
36
23
23
NA NA
10.0
9.0
4.6
6.3
1st Qtr 1/18/12
2nd Qtr 6/13/12
3rd Qtr 9/11/12
4th Qtr 10/3/12
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
4.4
6.6
6.6
6.0
1st Qtr 2/13/13
2nd Qtr 6/13/13
3rd Qtr 9/5/13
4th Qtr 11/13/13
<1.0
<1.0
<1.0
<1.0
34.9
37.9
41
44.3
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
23.1
22.9
36.2
37.1
5.6
8.9
12.1
14.2
1st Qtr 1/30/14
2nd Qtr 5/22/14
3rd Qtr 8/14/14
4th Qtr 10/28/14
<1.0
<1.0
<1.0
<1.0
6.93
6.93
32.8
33
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
38.9
47
49
40.8
12.8
12.2
9.8
11.1
1st Qtr 3/12/15
2nd Qtr 6/11/15
3rd Qtr 9/3/15
4th Qtr 10/28/15
<1.0
<1.0
<1.0
<1.0
32
30.5
28.7
52.9
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
41.6
43.5
47.6
39.4
11.7
9.69
15.7
3.24
(1) VOCswere resampled because laboratory missed holding time.
NA = not analyzed
Shaded indicates concentrations exceeding GWQS.
TABLE 1 (20 of 27)
Historic Summary Of Monitoring Parameters Up To The 3rd Quarter 2015
Chloroform Contamination Investigation
DUSA White Mesa Mill
Well
Sampling Event
Carbon Tetrachloride
(5 Pfl/L)
Chloroform
(70 pg/L)
Chloromethane
(30 pg/L)
Parameter
(GWQS)
Methylene Chloride
(5 pg/L)
Chloride
No GWQS (mg/L)
Nitrate, Nitrate + Nitrite
(10 mg/L)
TW4-19(chlorofrom pumping well started 4/30/03)1st Qtr 3/16/05
2nd Qtr 5/25/05
3rd Qtr 8/31/05
4th Qtr 12/7/05
NA
NA
<5.0
<50
2,200
1,200
1,400
2,800
NA
NA
<5.0
<50
NA
NA
<5.0
<50
NA
NA
NA
81 <0.1
5.3
5.7
4.6
1st Qtr 3/9/06
2nd Qtr 6/14/06
3rd Qtr 7/20/06
4th Qtr 11/8/06
<50
<50
<50
1.6
1,200
1,100
1,120
1,050
<50
<50
<50
2.6
<50
<50
<50
<1.0
86
116
123
134
4
5.2
4.3
4.6
4.1
4
1st Qtr 2/28/07
2nd Qtr 6/27/07
3rd Qtr 8/15/07
4th Qtr 10/10/07
1.3
1.9
1.9
1,200 <1.0
1,100
1,100
<1.0
<1.0
<1.0
Did not sample
<1.0
<1.0
133
129
132
1st Qtr 3/28/08
2nd Qtr 6/25/08
3rd Qtr 9/10/08
4th Qtr 10/15/08
<1.0
2.9
8.6
12
1,800
1,000
3,600
4,200
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
131
128
113
124
2.2
2.8
35.2
47.8
1st Qtr 3/4/09
2nd Qtr 6/23/09
3rd Qtr 9/14/09
4th Qtr 12/22/09
1.2
1.2
15
16
1,100
990
6,600
4,700
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
127
132
43
124
3.2
2.4
<0.1
26.7
1st Qtr 2/17/10
2nd Qtr 6/14/10
3rd Qtr 8/16/10
4th Qtr 10/15/10
1.3
4.2
4.9
1.3
940
1,800
2,000
1,200
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
144
132
142
146
2
4.4
5.9
2.71st Qtr 2/17/11
2nd Qtr 6/7/11
3rd Qtr 8/17/11
4th Qtr 11/17/11
(1) 12/5/11
17
8.3
2.1
5.4
3,400
4,000
970
2,200
<1.0<i.o
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
135
148
148
148
17.0
12.0
3.0
5.0
1st Qtr 1/23/12
2nd Qtr 6/6/12
3rd Qtr 9/4/12
4th Qtr 10/3/12
1.5
1.1
3.5
4
650
460
950
1500
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
138
149
149
150
0.6
2.4
2.5
4.1
1st Qtr 2/13/13
2nd Qtr 6/5/13
3rd Qtr 9/3/13
4th Qtr 10/29/13
5.15
5.15
20.7
6.42
4,210
2,070
8,100
942
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
164
148
179
134
8.0
3.0
17.6
4.7
1st Qtr 1/27/14
2nd Qtr 5/19/14
3rd Qtr 8/11/14
4th Qtr 10/21/14
4.05
5.51
1.9
4.8
586
810
1,410
4,310
<1.0
<1.0
8.3
<1.0
<1.0
<1.0
<1.0
<1.0
134
152
140
130
1.6
1.3
1
4.7
1st Qtr 3/9/15
2nd Qtr 6/8/15
3rd Qtr 8/31/15
4th Qtr 10/19/15
<1.0
8.92
2.62
12.2
4,660
1,570
7,860
7,840
<1.0
<1.0
7.78
5.46
<1.0
<1.0
<1.0
<1.0
238
180
326
130
8.56
0.916
11.6
4.7
(1) VOCs were resampled because laboratory missed holding time.
NA = not analyzed
Bold and italics indicates the MDL exceeded the GWQS.
Shaded indicates concentrations exceeding GWQS.
TABLE 1 (21 of 27)
Historic Summary Of Monitoring Parameters Up To The 3rd Quarter 2015
Chloroform Contamination Investigation
DUSA White Mesa Mill
Well
Sampling Event
Carbon Tetrachloride
(5 pg/L)
Chloroform
(70 pg/L)
Chloromethane
___(30 pg/L)___
Parameter
(GWQS)
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
2nd Qtr 5/25/05
3rd Qtr 8/31/05
(started pumping 8/4/05)
4th Qtr 12/7/05
NA
<10
<250
39,000
3,800
19,000
NA
<10
<250
Monitor well was not installed
NA
<10
<250
NA
NA
131
10.10
2.90
1.80
1st Qtr 3/9/06
2nd Qtr 6/14/06
3rd Qtr 7/20/06
4th Qtr 11/8/06
<500
<500
<1000
7.1
9,200
61,000
5,300
11,000
<500
<500
<1000
<500
<500
<1000
1.9 2.2
120
235
134
124
3.80
9.40
2.90
3.50
1st Qtr 2/28/07
2nd Qtr 6/27/07
3rd Qtr 8/15/07
4th Qtr 10/10/07
3.1
2.2
3.5
6.8
4,400
1,800
5,200
9,000
<1.0
<1.0
<1.0
<1.0
<1.0
1.1
1.8
1.9
124
112
117
170
4.20
2.30
2.10
5.60
1st Qtr 3/28/08
2nd Qtr 6/25/08
3rd Qtr 9/10/08
4th Qtr 10/15/08 NA
13.000
30.000
21.000
NA
<1.0
<1.0
<1.0
NA
1.5
1.2
3.7
NA
132
191
156
168
0.90
8.00
4.44
5.51
1st Qtr 3/4/09
2nd Qtr 6/23/09
3rd Qtr 9/14/09
4th Qtr 12/14/09
5.7
4.9
8.4
14
8,200
6,800
13.000
15.000
<1.0
<1.0
<1.0
<1.0
5.2
4.2
4.4
3.0
164
164
153
187
5.10
2.90
3.30
5.30
1st Qtr 2/17/10
2nd Qtr 6/14/10
3rd Qtr 8/16/10
4th Qtr 10/15/10
2,7
11
12
20
3,500
18,000
15.000
24.000
<1.0
<1.0
<1.0
<1.0
3.2
3.7
2.2
5.5
179
200
196
203
2.00
5.60
5.30
4.60
1st Qtr 2/23/11
2nd Qtr 6/1/11
3rd Qtr 8/17/11
4th Qtr 11/16/11
27
10
7.3
7.2
31,000
8,100
3,800
7,900
<1.0
<1.0
<1.0
<1.0
19.0
2.1
3.1
2.5
220
177
207
186
4.40
4.80
6.50
4.20
1st Qtr 1/23/12
2nd Qtr 6/6/12
3rd Qtr 9/4/12
4th Qtr 10/3/12
11000
36.000
13.000
19.000
<1.0
<1.0
<1.0
<1.0
1.3
<1.0
<1.0
<1.0
207
262
289
302
7.90
11.00
10.80
11.00
1st Qtr 2/11/13
2nd Qtr 6/5/13
3rd Qtr 9/3/13
4th Qtr 10/29/13
19.6
32.5
25.7
17.3
18,500
26,300
26,800
15,700
<1.0
<1.0
<1.0
<1.0
1.21
1.3
2.14
1.37
252
250
260
272
9.07
9.80
8.65
9.64
1st Qtr 1/27/14
2nd Qtr 5/19/14
3rd Qtr 8/11/14
4th Qtr 10/21/14
18.4
22.1
14.1
18.5
17,800
22,100
12,400
23,300
<1.0
2.31
55.2
4.04
2.04
3.98
2.2
2.38
254
269
299
292
7.56
5.95
4.30
7.67
1st Qtr 3/9/15
2nd Qtr 6/8/15
3rd Qtr 8/31/15
4th Qtr 10/19/15
20.8
16.2
15.1
14.5
19,900
17,600
17,000
17,000
4.85
13.4
12.3
10.8
1.38
1.73
<1.0
290
296
365
293
9.80
576
9.3
6.23
(1) VOCs were resampled because laboratory missed holding time.
NA = not analyzed
Bold and italics indicates the MDL exceeded the GWQS.
Shaded indicates concentrations exceeding GWQS.
TABLE 1 (22 of 27)
Historic Summary Of Monitoring Parameters Up To The 3rd Quarter 2015
Chloroform Contamination Investigation
DUSA White Mesa Mill
Well
Sampling Event
Carbon Tetrachloride
_____(Sjig/L)
Chloroform
(70pg/L)
Chloromethane
___(30 pg/L)___
Parameter
(GWQS)
Methylene Chloride
____(Spg/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
2nd Qtr 5/25/05
3rd Qtr 8/31/05
4th Qtr 12/7/05
NA
<5.0
<1.0
192
78
86
Monitor well was not installed
NA NA
<5.0 <5.0
<1.0 <1.0
NA
NA
353
14.6
10.1
9.6
1st Qtr 3/9/06
2nd Qtr 6/14/06
3rd Qtr 7/20/06
4th Qtr 11/8/06
<2.5
<2.5
<2.5
120
120
108
139
<2.5
<2.5
<2.5
<1.0
<2.5
<2.5
<2.5
<1.0
347
318
357
296
8.5
10.2
8.9
8.7
1st Qtr 2/28/07
2nd Qtr 6/27/07
3rd Qtr 8/15/07
4th Qtr 10/10/07
<1.0
<1.0
1.8
5.8
160
300
140
120
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
306
327
300
288
8.7
8.6
8.6
8.3
1st Qtr 3/28/08
2nd Qtr 6/25/08
3rd Qtr 9/10/08
4th Qtr 10/15/08
11/18/08
NA
7
1.7
1.6
NA
390
180
120
170
<1.0
<1.0
<1.0
NA
<2.0
<1.0
<1.0
<1.0
NA
<2.0 NA
331
271
244
284
NA
14.3
8.8
7.57
8.0
1st Qtr 3/11/09
2nd Qtr 6/23/09
3rd Qtr 9/14/09
4th Qtr 12/22/09
<1.0
<1.0
<1.0
<1.0
1st Qtr 2/25/10
2nd Qtr 614/10
3rd Qtr 8/13/10
4th Qtr 10/15/10
<1.0
<1.0
1st Qtr 2/22/11
2nd Qtr 6/28/11
3rd Qtr 8/17/11
4th Qtr 11/16/11
(1) 12/7/11
180
200
200
160
9.2
1.2
1.2
4.8
6.3
6.7
170
210
390
200"230
290
460
390
<1.0
<1.0
<1.0
<1,0..<To
<1.0
<1.0
<i.o
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
279
291
281
256
228
266
278
210
303
290
287
287
8.3
8.1
9.2
8.4 ”8.4
12.0
14.0
7.0
9.0
12.0
14.0
13.0
1st Qtr 1/19/12
2nd Qtr 6/13/12
3rd Qtr 9/13/12
4th Qtr 10/4/12
6.4
5.4
6
7
420
400
410
390
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
228
285
142
270
15.0
11.0
13.0
14.0
1st Qtr 2/13/13
2nd Qtr 6/18/13
3rd Qtr 9/13/13
4th Qtr 11/13/13 <1.0
5.25
3.49
2.13
282
328
244
204
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
221
243
207
206
11.8
13.8
10.3
9.0
1st Qtr 2/5/14
2nd Qtr 5/22/14
3rd Qtr 8/27/14
4th Qtr 10/29/14
<1.0
1.04
6.23
4.73
220
240
204
229
<1.0
<1.0
<1.0
<1.0
2.04
2.04
<1.0
<1.0
200
243
230
252
11.4
11.5
7.1
10.0
1st Qtr 3/12/15
2nd Qtr 6/8/15
(started pumping 6/9/15)3rd Qtr 8/31/15
4th Qtr 10/19/15
1.92
<1.0
1.04
1.75
366
281
339
292
<1.0
<1.0
<1.0
<1.0.
<1.0
<1.0
<1.0
<1.0
494
499
413
255
13.1
14.7
14.3
10.9
(1) VOCs were resampled because laboratory missed holding time.
NA = not analyzed
Shaded indicates concentrations exceeding GWQS.
TABLE 1 (23 of 27)
Historic Summary Of Monitoring Parameters Up To The 3rd Quarter 2015
Chloroform Contamination Investigation
DUSA White Mesa Mill
Well
Sampling Event
Carbon Tetrachloride
_____(5 pg/L)_____
Chloroform
(70 Pfl/L)
Chloromethane
(30 pg/L)
Parameter
(GWQS)
Methylene Chloride
(5 pg/L)
Chloride
No GWQS (mg/L)
Nitrate, Nitrate + Nitrite
(10 mg/L)
TW4-22(nitrate pumping well started 1/26/13)1st Qtr 3/16/05
2nd Qtr 5/25/05
3rd Qtr 8/31/05
4th Qtr 12/7/05
NA
<5.0
<5.0
340
290
320
Monitor well was not installed
NA NA
<5.0 <5.0
<5.0 <5.0
NA
NA
253
18.2
15.7
15.1
1st Qtr 3/9/06
2nd Qtr 6/14/06
3rd Qtr 7/20/06
4th Qtr 11/8/06
<10
<10
<10
<1.0
390
280
864
350
<10
<10
<10
1.6
<10
<10
<10
<1.0
236
221
221
236
15.3
14.3
14.5
15.9
1st Qtr 2/28/07
2nd Qtr 6/27/07
3rd Qtr 8/15/07
4th Qtr 10/10/07
<1.0
<1.0
<1.0
<1.0
440
740
530
440
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
347
273
259
238
20.9
19.3
19.3
18.8
1st Qtr 3/28/08
2nd Qtr 6/25/08
3rd Qtr 9/10/08
4th Qtr 10/15/08
11/18/08
<1.0
<1.0
NA
<2.0
1.3
NA
1,400
1,200
6,300
630
<1.0
<1.0
<1.0
NA
<2.0
<1.0
<1.0
<1.0
NA
<2.0 NA
519
271
524
539
NA
391
41 9
38.7
36.3
1st Qtr 3/11/09
2nd Qtr 6/23/09
3rd Qtr 9/14/09
4th Qtr 12/29/09
<1.0
<1.0
<1.0
<1.0
390
730
2,300
380
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
177
177
391
175
20.7
20.6
40.3
17.8
1st Qtr 3/3/10
2nd Qtr 6/14/10
3rd Qtr 8/24/10
4th Qtr 10/15/10
<1.0
<1.0
<1.0
<1.0
2,200
540
340
340
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
427
134
130
134
36.8
19.0
15.0
16.0
1st Qtr 2/22/11
2nd Qtr 6/1/11
3rd Qtr 8/17/11
4th Qtr 11/16/11
(1) 12/7/11
<1.0
<1.0
NA
<1.0
1.2
NA
1,300
210
450
400
<1.0
<1.0
<1.0
NA
<1.0
<1.0
<1.0
<1.0
NA
<1.0
114
138
120
174
NA NA
18.0
17.0
15.0
19.0
1st Qtr 1/19/12
Strated pumping
2nd Qtr 6/13/12
3rd Qtr 9/12/12
4th Qtr 10/4/12
<1.0
<1.0
<1.0
<1.0
200
120
121
330
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0 130
14.0
12.8
7.0
14.0
1st Qtr 2/11/13
(started pumping 1/26/13)
2nd Qtr 6/5/13
3rd Qtr 9/3/13
4th Qtr 10/29/13
3.24
3.35
3.25
8.09
10,600
12,500
9,640
13,300
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
130
586
487
501
58.0
50.2
29.7
45.2
1st Qtr 1/27/14
2nd Qtr 5/19/14
3rd Qtr 8/11/14
4th Qtr 10/29/14
6.06
6.65
1.9
3.32
12,100
12,400
12,400
12,400
<1.0
<1.0
2.83
40
1.61
<1.0
<1.0
<1.0
598
614
540
596
54.6
47.2
41.5
54.9
1st Qtr 3/9/15
2nd Qtr 6/8/15
3rd Qtr 8/31/15
4th Qtr 10/19/15
<1.0
3.77
2.42
3.32
12,700
8,050
7,810
7,530
4.31
3.42
5.47
5.1
<1.0
<1.0
<1.0
<1.0
675
390
557
567
69.2
47.1
64.7
56.1
(1) VOCs were resampled because laboratory missed holding time.
NA = not analyzed
Shaded indicates concentrations exceeding GWQS.
Bold and italics indicates the MDL exceeded the GWQS.
TABLE 1 (24 of 27)
Historic Summary Of Monitoring Parameters Up To The 3rd Quarter 2015
Chloroform Contamination Investigation
DUSA White Mesa Mill
Well
Sampling Event
Carbon Tetrachloride
(5 pg/L)
Chloroform
(70 H9'L)
Chloromethane
(30 ug/L)
Parameter
(GWQS)
Methylene Chloride
(5 M9/L)
Chloride
No GWQS (mg/L)
Nitrate, Nitrate + Nitrite
(10 mg/L)
TW4-23
2nd Qtr 6/27/07
3rd Qtr 8/15/07
4th Qtr 10/10/07
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<0.1
<0.1
<0.1
1st Qtr 3/28/08
2nd Qtr 6/25/08
3rd Qtr 9/10/08
4th Qtr 10/15/08
11/18/08
<1.0
<1.0
<1.0
NA
<2.0
<1.0
<1.0
<1.0
NA
<2.0
<1.0
<1.0
<1.0
NA
<2.0
<1.0
<1.0<1.6
NA
<2.0 NA
<0.1
<0.1
<0.05
<0.05
NA
1st Qtr 3/4/09
2nd Qtr 6/23/09
3rd Qtr 9/14/09
4th Qtr 12/16/09
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<0,1
<0.1
<0.1
<0.1
1st Qtr 2/24/10
2nd Qtr 6/14/10
3rd Qtr 8/24/10
4th Qtr 10/15/10
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<10
<1.0
<0.1
<0.1
<0.1
<0.1
1st Qtr 2/16/11
2nd Qtr 6/14/11
3rd Qtr 8/16/11
4th Qtr 11/15/11
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1,0
<1.0
<1.0
<0.1
<0.1
<0.1
<0.1
1st Qtr 1/17/12
2nd Qtr 5/31/12
3rd Qtr 8/29/12
4th Qtr 10/3/12
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<0.1
<0.1
<0.1
<0.1
1st Qtr 2/7/13
2nd Qtr 5/30/13
3rd Qtr 9/5/13
4th Qtr 11/7/13
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<10
<1.0
43.6
44.7
48
43
<0.1
0.1
<0,1
<0.1
1st Qtr 1/23/14
2nd Qtr 5/19/14
3rd Qtr 8/13/14
4th Qtr 10/28/14
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
44.6
42.3
46
46.8
<0.1
<0.1
<0.1
<0.1
1st Qtr 3/12/15
2nd Qtr 6/8/15
3rd Qtr 9/3/15
4th Qtr 10/28/15
Duplicate TW4-70
<10
<1.0
<10
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<10
<10
<1.0
<10
47.3
48.4
54.1
46.4
46.4
<0.1
<0.1
<0.1
<0.1
<0.1
NA = not analyzed
Shaded indicates concentrations exceeding GWQS.
TABLE 1 (25 of 27)
Historic Summary Of Monitoring Parameters Up To The 3rd Quarter 2015
Chloroform Contamination Investigation
DUSA White Mesa Mill
Well
Sampling Event
Carbon Tetrachloride
(5 pg/L)
Chloroform
(70 pg/L)
Chloromethane
(30 pg/L)
Parameter
(GWQS)
Methylene Chloride
(s ug/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
3rd Qtr 8/15/07
4th Qtr 10/10/07
<1.0
<1.0
<1.0
2.6
2.2
1.5
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
770
791
692
26.1
29
24.7
1st Qtr 3/28/08
2nd Qtr 6/25/08
3rd Qtr 9/10/08
4th Qtr 10/15/08
11/18/08
<1.0
<1.0
<1.0
NA
<2.0
1.5
1.4
2.9
NA
<2.0
<1.0
<1.0
<1.0
NA
<2.0
<1.0
<1.0
<1.0
NA
<2.0 NA
740
834
1180
1130
NA
24.4
45.3
38.4
44.8
1st Qtr 3/4/09
2nd Qtr 6/23/09
3rd Qtr 9/14/09
4th Qtr 12/16/09
<1.0
<1.0
<1.0
<1.0
1.4
1.5
1.4
1.2
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
1010
759
618
1080
30.5
30.4
30.7
28.3
1st Qtr 2/25/10
2nd Qtr 6/14/10
3rd Qtr 8/24/10
4th Qtr 10/15/10
<1.0
<1.0
<1.0
<1.0
1.3
1.7
1.8
1.4
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
896
639
587
522
33.1
30
31
31
1st Qtr 2/17/11
2nd Qtr 5/26/11
3rd Qtr 8/17/11
4th Qtr 11/16/11
(1) 12/7/11
<1.0
<1.0
<1.0
NA
<1.0
NA
1.8
1.1
1.7
1.2
<1.0
<1.0
<1.0
NA
<1.0
<1.0
<1.0
<1.0
NA
<1.0 NA
1100
1110
967
608
NA
1st Qtr 1/16/12
2nd Qtr 6/6/12
3rd Qtr 8/30/12
4th Qtr 10/3/12
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
373
355
489
405
1st Qtr 2/11/13
(Started pumping 1/26/13)2nd Qtr 6/5/13
3rd Qtr 8/30/13
4th Qtr 10/29/13
<1.0
<1.0
<1.0
<1.0
1
17.4
21.8
32.5
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
1260
916
998
1030
35.9
23.7
33
35
1st Qtr 1/27/14
2nd Qtr 5/19/14
3rd Qtr 8/11/14
4th Qtr 10/21/14
1.18
<1.0
<1.0
<1.0
78.5
62.7
76.3
25.8
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
809
1020
1150
1050
31.6
35.0
31.5
35.7
1st Qtr 3/9/15
2nd Qtr 6/8/15
3rd Qtr 8/31/15
4th Qtr 10/19/15
<1.0
<1.0
<1.0
<1.0
49.2
4.28
46.9
25.3
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
944
1290
788
909
34.6
31.8
25.3
29.6
(1) VOCs were resampled because laboratory missed holding time.
NA = not analyzed
Shaded indicates concentrations exceeding GWQS.
TABLE 1 (26 of 27)
Historic Summary Of Monitoring Parameters Up To The 3rd Quarter 2015
Chloroform Contamination Investigation
DUSA White Mesa Mill
Well
Sampling Event
Carbon Tetrachloride
(5 pg/L)
Chloroform
(70 pg/L)
Chloromethane
___(30 pg/L)___
Parameter
(GWQS)
Methylene Chloride
(S pg/L)
Chloride
No GWQS (mg/L)
Nitrate, Nitrate + Nitrite
_____(10 mg/L)_____
TW4-25
(nitrate pumping well started 1/26/13)2nd Qtr 6/27/07
3rd Qtr 8/15/07
4th Qtr 10/10/07....
<1.0
<1.0
<1.0
<1.0
<1.0
2.2
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
395
382
358
17.1
29
17
1st Qtr 3/28/08
2nd Qtr 6/25/08
3rd Qtr 9/10/08
4th Qtr 10/15/08
4th Qtr 11/18/09
<1.0
<1.0
<1.0
NA
<2.0
<1.0
<1.0
<1.0
NA
<2.0
<1.0
<1.0
<1.0
NA
<2.0
<1.0
<1.0
<1.0
NA
<2.0 NA
374
344
333
366
NA
18.7
22.1
18.8
21.3
1st Qtr 3/4/09
2nd Qtr 6/23/09
3rd Qtr 9/14/09
4th Qtr 12/14/09
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
332
328
328
371
15.3
15.3
3.3
14.2
1st Qtr 2/23/10
2nd Qtr 6/14/10
3rd Qtr 8/10/10
4th Qtr 10/15/10
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1,0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
296
306
250
312
14.4
16
14
15
1st Qtr 2/16/11
2nd Qtr 5/25/11
3rd Qtr 8/16/11
4th Qtr 11/15/11
<1.0
<1.0
<1.0
<1.0
1.8
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
315
321
276
294
1st Qtr 1/16/12
2nd Qtr 5/31/12
3rd Qtr 9/4/12
4th Qtr 10/3/12
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
304
287
334
338
1st Qtr 2/11/13
(started pumping 1/26/13)
2nd Qtr 6/5/13
3rd Qtr 9/4/13
4th Qtr 10/31/13
<1.0
<1,0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<10
<1.0
190
136
119
88.6
9.04
5.24
5.69
6.1
1st Qtr 1/27/14
2nd Qtr 5/19/14
3rd Qtr 8/11/14
4th Qtr 10/21/14
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
85.7
51.1
67
58.1
2.16
1.21
1.6
1.03
1st Qtr 3/9/15
2nd Qtr 6/8/15
3rd Qtr 8/31/15
4th Qtr 10/19/15
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
310
58.3
69.2
93.7
14.4
1.14
1.63
1.78
(1) VOCs were resampled because laboratory missed holding time.
NA = not analyzed
Shaded indicates concentrations exceeding GWQS.
TABLE 1 (27 of 27)
Historic Summary Of Monitoring Parameters Up To The 3rd Quarter 2015
Chloroform Contamination Investigation
DUSA White Mesa Mill
Well
Sampling Event
Parameter
(GWQS)
Carbon Tetrachloride
_____jSjjgM_____
Chloroform
(70 H9'L)
Chloromethane
___(30 H8'L)___
Methylene Chloride
(5 M9/L)
Chloride
No GWQS (mg/L)
Nitrate, Nitrate + Nitrite
(10 mg/L)
TW4-26
2nd Qtr 6/14/10
3rd Qtr 8/24/10
4th Qtr 10/15/10
<1.0
<1.0
<1.0
13
5.2
5.4
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
7.9
9.0
9.6
1st Qtr 2/16/11
2nd Qtr 5/26/11
3rd Qtr 8/17/11
4th Qtr 11/16/11
(1) 12/7/11
<1.0
<1.0
<1.0
NA
<1.0
NA
2
2.9
2.8
5.2
<1.0
<1.0
<1.0
NA
<1.0
<1.0
<1.0
<1.0
NA
<1.0 NA NA
10.0
10.0
11.0
10.0
1st Qtr 1/18/12
2nd Qtr 6/6/12
3rd Qtr 9/11/12
4th Qtr 10/3/12
<1.0
<1.0
<1.0
<1.0
7
4.1
4.9
4.9
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
11.0
12.0
9.0
12.0
1st Qtr 2/7/13
2nd Qtr 6/13/13
3rd Qtr 9/5/13
4th Qtr 11/7/13
<1.0
<1.0
<1.0
<1.0
4.9
2.12
2.81
3.37
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
16.6
14.5
17.6
15.9
12.5
13.6
11.7
15.9
1st Qtr 1/29/14
2nd Qtr 5/21/14
3rd Qtr 8/11/14
4th Qtr 10/28/14
<1.0
<1.0
<1.0
<1.0
1.43
4.23
1.3
2.45
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
16.9
15.4
15
14.6
14.2
12.5
10.8
12.3
1st Qtr 3/12/15
2nd Qtr 6/10/15
3rd Qtr 9/3/15
4th Qtr 10/28/15
<1.0
<1.0
<1.0
<1.0
2.37
6.12
4.77
3.45
<1.0
<1.0
<1.0
1.17
<1.0
<1.0
<1.0
<1.0
14.4
14.4
14
13.3
14.4
11.3
14.2
13.9
TW4-27
1st Qtr 1/18/12
2nd Qtr 6/13/12
3rd Qtr 9/4/12
4th Qtr 10/3/12
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
24.0
41.0
37.0
36.0
1st Qtr 2/7/13
2nd Qtr 6/13/13
3rd Qtr 8/30/13
4th Qtr 11/6/13
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
18.8
20.3
19
21.8
31.2
29.4
27.2
29.8
1st Qtr 1/23/14
2nd Qtr 5/21/14
3rd Qtr 8/13/14
4th Qtr 10/28/14
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
31.8
20.6
23
24.4
31.3
31.1
27.0
28.2
1st Qtr 3/11/15
2nd Qtr 6/10/15
3rd Qtr 9/2/15
4th Qtr 10/28/15
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
1.3
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
26.2
26.8
26.8
26.2
26.5
24.0
20.9
23.5
TW4-28
2nd Qtr 6/19/13
3rd Qtr 8/29/13
4th Qtr 11/6/13
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
44.6
45.3
45.3
14.9
17.3
16.2
1st Qtr 1/22/14
2nd Qtr 5/21/14
3rd Qtr 8/13/14
4th Qtr 10/23/14
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
47.8
45.7
50
52.1
16.9
16.5
14.2
16.5
1st Qtr 3/11/15
2nd Qtr 6/10/15
3rd Qtr 9/2/15
4th Qtr 10/21/15
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
52.2
56.4
61.4
52.7
19.0
19.0
17.8
18.7
TW4-29
2nd Qtr 6/19/13
2nd Qtr 7/11/13
3rd Qtr 9/26/13
4th Qtr 11/13/13
<1.0
<1.0
<1.0
<1.0
242
262
246
260
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
44.8
37.7
41.4
42.5
4.60
3.52
4.18
4.11
1st Qtr 2/5/14
2nd Qtr 5/22/14
3rd Qtr 8/27/14
4th Qtr 10/29/14
<1.0
<1.0
<1.0
<1.0
258
262
242
290
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
14.9
38.2
41
41
4.63
3.52
3.40
3.64
1st Qtr 3/12/15
2nd Qtr 6/11/15
3rd Qtr 9/3/15
4th Qtr 10/29/15
<1.0
<1.0
<1.0
<1.0
299
329
276
631
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
40.5
42.5
47.3
39.8
4.14
2.95
2.19
2.74
(1) VOCs were resampled because laboratory missed holding time.
NA = not analyzed
Shaded indicates concentrations exceeding GWQS.
TABLE 1 (27 of 27)
Historic Summary Of Monitoring Parameters Up To The 3rd Quarter 2015
Chloroform Contamination Investigation
DUSA White Mesa Mill
Well
Sampling Event
Carbon Tetrachloride
(5 P9/L)
Chloroform
(70 H9'L)
Chloromethane
___(30 pg/L)___
Parameter
(GWQS)
Methylene Chloride
(5 M9/L)
Chloride
No GWQS (mg/L)
Nitrate, Nitrate + Nitrite
(10 mg/L)
TW4-30
2nd Qtr 6/19/13
3rd Qtr 9/26/13
4th Qtr 11/13/13
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
36
36.3
35.9
0.95
0.952
1.24
1st Qtr 1/23/14
2nd Qtr 5/22/14
3rd Qtr 8/13/14
4th Qtr 10/23/14
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
36.9
31.9
38
37.1
1.36
1.44
1.5
1.84
1st Qtr 3/11/15
2nd Qtr 6/11/15
3rd Qtr 9/3/15
4th Qtr 10/28/15
<1.0
<1.0
<1.0
<1.0
1.65
2.25
3.27
3.48
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
38.3
40.3
37.8
37.1
2.15
1.75
1.86
1.84
TW4-31
2nd Qtr 6/19/13
3rd Qtr 9/5/13
4th Qtr 11/7/13
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
28.4
29.4
28
1.3
1.1
1.33
1st Qtr 1/23/14
2nd Qtr 5/21/14
3rd Qtr 8/13/14
4th Qtr 10/28/14
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
28.5
26.3
30
37.1
1.32
1.22
1.1
1.84
1st Qtr 3/11/15
2nd Qtr 6/10/15
3rd Qtr 9/2/15
4th Qtr 10/21/15
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
30.6
31.1
30.4
29.1
1.33
1.19
0.916
0.953
TW4-32
4th Qtr 11/14/13 <1.0 <1.0 <1.0 <1.0 52.1 4.26
1st Qtr 1/22/14
2nd Qtr 5/21/14
3rd Qtr 8/13/14
4th Qtr 10/23/14
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
54.5
54.9
64
62.6
5.11
5.63
4.2
2.14
1st Qtr 3/11/15
Duplicate TW4-65
2nd Qtr 6/10/15
3rd Qtr 9/2/15
4th Qtr 10/21/15
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
64.2
65.9
62.7
59.6
55.1
2.46
2.25
1.21
5.09
1.19
TW4-33
4th Qtr 11/14/13 <1.0 126 <1.0 <1.0 47.2 1.82
1st Qtr 1/30/14
2nd Qtr 5/22/14
3rd Qtr 8/27/14
4th Qtr 10/29/14
1st Qtr 3/12/15
2nd Qtr 6/11/15
3rd Qtr 9/3/15
4th Qtr 10/29/15
<1.0
<1.0
<1.0
<10..<i.o
<1.0
<1.0
<1.0
124
121
104
124
134
127
123
129
<1.0
<1.0
<1.0
<10.<i.o
<1.0
<1.0
<10
<1.0
<10
<1.0
<1.0
<1.0
<1.0
<1.0
<10
43.5
46.8
43
44.2
44.2
46.6
53.3
44.5
2.56
1.63
150
2.22
191
162
1.64
192
TW4-34
4th Qtr 11/14/13 <1.0 <1.0 <1.0 <1.0 19.2 1.64
1st Qtr 1/23/14
2nd Qtr 5/22/14
3rd Qtr 8/13/14
4th Qtr 10/29/14
<1.0
<1.0
<1.0
<1.0
<1.0
<10
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
20.4
17.9
18
17.8
1.93
1.69
1.10
1.16
1st Qtr 3/11/15
2nd Qtr 6/11/15
3rd Qtr 9/3/15
4th Qtr 10/21/15
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
177
17.4
15.1
15.8
1.21
0.868
0.458
0.368
TW4-35
3rd Qtr 8/27/14
4th Qtr 10/28/14
<1.0
<1.0
<10
<10
<1.0
<1.0
<1,0
<1.0
34
34.1
0.2
0.351
1st Qtr 3/11/15
2nd Qtr 6/10/15
3rd Qtr 9/3/15
4th Qtr 10/28/15
<1.0
<1.0
<1.0
<10
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<10
<1.0
<1.0
<1.0
<10
34.9
35.2
35.9
33.4
0.436
0.452
0.304
0.419
TW4-36
3rd Qtr 8/27/14
4th Qtr 10/23/14
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
65
67.3
<0.1
<0.1
1st Qtr 3/11/15
2nd Qtr 6/10/15
3rd Qtr 9/3/15
4th Qtr 10/21/15
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<10
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<10
67.2
69.3
76.4
64.5
<0.1
<0.1
<0.1
<0.1
TW4-37 (chloroform
pumping well 6/9/15)2nd Qtr 6/8/15
3rd Qtr 8/31/15
3rd Qtr 10/19/15
18.2
16.6
12.5
30,200
19,100
19,500
15.7
13.7
9.38
1.94
1.04
1.17
345 35.2
374 32.4
34.6399
Shaded indicates concentrations exceeding GWQS.
(1) VOCs were resampled because laboratory missed holding time.
Table 2
Summary of QA/QC Samples
4th Quarter 2015
Parameter GWQS Duplicate of TW4-12
TW4-12 TW4-65 RPD
Pup
TW4-23
icate of TW4-23
TW4-70 RPD
Chloride none 51.0 51.3 -0.6 46.4 46.7 -0.6
Nitrate + Nitrite (as N)10 mg/L 18.0 18.9 -4.9 <0.1 <0.1 nc
ncChloroform70 pg/L <1.0 <1.0 nc <1.0 <1.0
Carbon tetrachloride 5 pg/L <1.0 <1.0 nc <1.0 <1.0 nc
nc
nc
Chloromethane 30 pg/L <1.0 <1.0 nc <1.0 <1.0
Methylene Chloride 5 pg/L <1.0 <1.0 nc <1.0 <1.0
nc = not calculated
Tabel 3
Chloroform Mass Removal Calculations for the 4th Qurater 2015
DUSA White Mesa Mill, Bland, Utah
Well ID MW4 MW-26 TWN-2 TW4-1 TW4-2 TW4-4 TW4-11 TW4-19 TW4-20 TW4-21 TW4-22 TW4-24 TW4-25 TW4-37
Ave. Chloroform (ug/L)
Chloroform (g/L)
Chloroform (Ibs/L)
Chloroform (Ibs/gal)
Total gallons pumped 3rd qtr 2015
lbs of chloroform removed
Gallons of chloroform removed
1,200
1.20E-03
2.65E-06
1.00E-05
99,633
1.00
0.08
2,680
2.68E-03
5.92E-06
2.24E-05
19,356
0.43
0.04
0.00E+00
0.00E+00
0.00E+00
46,754
0.00
0.00
1,040
1.04E-03
2.30E-06
8.70E-06
20,764
0.18
0.01
2,070
2.07E-03
4.57E-06
1.73E-05
21,770
0.38
0.03
1,190
1.19E-03
2.63E-06
9.95E-06
59,235
0.59
0.05
2,730
2.73E-03
6.03E-06
2.28E-05
4,110
0.09
0.01
7,840
7.84E-03
1.73E-05
6.56E-05
112,763
7.39
0.60
17,000
1.70E-02
3.76E-05
1.42E-04
15,547
2.21
0.18
339
3.39E-04
7.49E-07
2.83E-06
134,775
0.38
0.03
7,530
7.53E-03
1.66E-05
6.30E-05
23,658
1.49
0.12
25.3
2.53E-05
5.59E-08
2.12E-07
107,799
0.02
0.002
0
1.00E-07
2.21 E-10
8.36E-10
116,420
0.00
0.00
19,500
1.95E-02
4.31 E-05
1.63E-04
111,738
18.22
1.48
total lbs of chloroform removed 32.39
total gallons of chloroform removed 2.64
Chloroform Pumping Wells
Nitrate Pumping Wells
Table 4
Summary of a Comparison with DWMRC split samples with EFR Collected October 21, 2015
4th Quarter 2015
Parameter GWQS TW4-3
DWMRC EFR RPD
TW4-12 TW4-13
DWMRC EFR RPD DWMRC EFR RPD
TW4-14
DWMRC EFR RPD
Chloride
Nitrate + Nitrite
(as N)
Chloroform
Carbon
tetrachloride
Chloromethane
Methylene
Chloride
none
10 mg/L
70 (jg/L
5 pg/L
30 Mg/L
5 pg/L
27.0
5.3
25.6
5.37
5.3
-1.3
55
20
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
nc
nc
nc
nc
<1.0
<1.0
<1.0
<1.0
51
18
<1.0
<1.0
<1.0
<1.0
7.5
nc
nc
nc
nc
nc
70.0
6.1
65.5
5.78
6.6
5.4
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
nc
nc
nc
nc
44
2.8
1.4
<1.0
<1.0
<1.0
40.6
” 2.45
1.46
<1.0
<1.0
<1.0
8.0
13.3
-4.2
nc
nc
nc
Parameter GWQS TW4-25 TW4-28
DWMRC EFR RPD DWMRC
TW4-32 TW4-36
EFR RPD DWMRC EFR RPD DWMRC EFR RPD
Chloride
Nitrate + Nitrite
(as N)
Chloroform
Carbon
tetrachloride
Chloromethane
Methylene
Chloride
none
10 mg/L
70 pg/L
5 pg/L
30 Mg/L
5 Mg/L
94.0
1.5
93.7
1.78
0.3
-17.1
57
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
nc
nc
nc
nc
NA
<1.0
<1.0
<1.0
<1.0
52.7
18.7
<1.0
<1.0
<1.0
<1.0
7.8
nc
nc
nc
nc
nc
64.0
3.0
<1.0
<1.0
<1.0
<1.0
55.1
1.19
<1.0
<1.0
<1.0
<1.0
14.9 70
86.4
nc
nc
nc
nc
<0.1
<1.0
<1.0
<1.0
<1.0
64.5
<0.1
<1.0
<1.0
<1.0
<1.0
8.2
nc
nc
nc
nc
nc
DWMRC Duplictate Sample
Parameter
Chloride
Nitrate + Nitrite
(as N)
Chloroform
Carbon
tetrachloride
Chloromethane
Methylene
Chloride
GWQS
none
10 mg/L
70 pg/L
5 Mg/L
30 pg/L
5 pg/L
TW4-81 (DWMRC dup of TW4-12)
TW4-12
55
20
<1.0
<1.0
<1.0
<1.0
TW4-81
55
21
<1.0
<1.0
<1.0
<1.0
RPD
0.0
-4.9
nc
nc
nc
nc
nc = not calculated
NA = Not analyzed
RPD exceeding 30% for DRC comparing their duplicate sample with ES sample