DRC-2013-001412 - 0901a06880352aa5

State of Utah
GARY R HERBERT
Governor
GREG BELL
Lieutenant Governor
Department of
Environmental Quality
Amanda Smith
Executive Director
DIVISION OF RADIATION CONTROL
Rusty Lundberg
Director
MEMORANDUM
TO:
FROM:
DATE:
SUBJECT:
Phil Goble
// DRC-2013.00 141
Dean Henderson 2^/^^7/^/5
February 27,2013
Review ofthe 4th Quarter 2012 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 Radiation Control ("DRC") has reviewed the February 18,2013,4th Quarter 2012
Chloroform Monitoring Report ("Report") for the Chloroform Contamination Investigation. For the
review of this report the following regulatory enforcement documents were used:
• EFR was issued Ground Water Quality Discharge Permit No. UGW370004 ("Permit") on March 8,
2005; last revised on August 24,2012.
• The EFR Quality Assurance Plan ("QAP") June 7,2012 (Revision. 7.2)
REVIEW
Monitor Well Sampling
The following monitor wells were sampled as required in the QAP (see Table 1 below):
TW4-1, TW4-2, TW4-3, TW4-4, TW4-5, TW4-6, TW4-7, TW4-8, TW4-9, TW4-10, TW4-11, TW4-12,
TW4-13, TW4-14, TW4-16, TW4-18, TW4-19, TW4-20, TW4-21, TW4-22, TW4-23, TW4-24, TW4-25,
MW-4, MW-26 (formerly TW 4-15), MW-32 (formerly TW4-17), TW4-26, and TW4-27.
The following 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: TW4-1, TW4-5, TW4-8, TW4-9, TW4-11, TW4-12, TW4-16, TW4-18, MW-32, TW4-
21, TW4-23, TW4-24, and TW4-25.
2. Purging a well to dryness and stability of field parameters for pH, specific conductivity, and
195 North 1950 West • Salt Lake City, UT
Maihng Address P.O. Box 144850 • Salt Lake City, UT 84114-4850
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water temperature only after recovery:
, Wells: TW4-2, TW4-3, TW4-6, TW4-7, TW4-10, TW4-13, TW4-14, TW4-22, TW4-26,
andTW4-27
The water samples for the above wells were analyzed for the following constituents as required in the
QAP:
Chloroform, Chloromethane, Carbon tetrachloride, Methylene chlonde. Chloride and Nitrate plus Nitrite as
Nitrogen. Use of analytical methods is consistent with the requirements ofthe QAP requirements.
QAQC
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 Limits
Only 3 of the 33 sample sets were measured and reported to the required reporting limits. The remainder
30 sets (28 samples and 2 duplicates) 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.
Sample Duplicates
Two duplicate samples were collected. Well TW4-9 and its duplicate sample TW4-65 and TW4-21 and its
duplicate sample TW4-70. All analytical results for both the sample/duplicate pairs were within the 20%
acceptance limits as required in the QAP (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 groundwiater 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-
4,TW4-19,andTW4-20.
Page 3
Mass Removed
Chloroform removal was first estimated fi-om the first quarter 2007. Since that estimation the mass
removed by each pumping well for each quarter has been calculated. Estimated mass removed in 4*
quarter 2012 is 7.1 lbs. (see Table 3 below).
Reporting
The Report included the following information as required in the QAP:
a) Introduction
b) Sampling and Monitonng 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 groimdwater
contour map, 2) hydrographs to show groimdwater elevation in each
monitor well over time, 3) depth to groundwater measured and
groimdwater elevation fi-om each monitor well summarized in a data table,
that includes historic groundwater level data for each well, and 4) an
evaluation ofthe effectiveness of hydraulic capture of all contaminants of
concem.
-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 ug/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.
d) Conclusions and Recommendations
e) Electronic copy of all laboratory results for Chloroform Investigation
monitoring conducted dunng the quarter.
f) Copies of DUSA field records, laboratory reports and chain of custody forms.
Evaluation ofthe Chloroform Contaminate Plume and Its Associated Contaminants
Bounding Chloroform Plume
It appears that the chloroform contaminate plume and associated contaminants, carbon tetrachloride,
chloromethane, and methylene chloride is bound in all directions by wells that have a chloroform
concentration of <70 \igfL (GWQS = 70 ^ig/L). Therefore, no additional wells, at this time, need to be
Page 4
installed downgradient, across, or upgradient ofthe chloroform contaminate plume to demonstrate the
plume is bound within a 70 \ig/L isoconcentration line.
Capturing Chloroform Plume
In addition, it appears that the pumping wells (MW-4, MW-26, TW4-4, TW4-19, and TW4-20), at this
time, are capturing groundwater with chloroform concentrations exceeding 70 ug/L.
Monitor Wells Exceeding Chloroform Concentrations of 70fig/L
There are 7 monitor wells exceeding chloroform concentrations of 70|ig/L. Monitor well TW4-1, TW4-2,
TW4-7, TW4-10, TW4-11, and TW4-22 have decreasing trends. Monitor well TW4-21 has an increasing
trend (see Table 1 below).
Monitor Wells with Chloroform Concentrations Between 1 fig/L and 70ug/L
There are nine monitor wells that have chloroform concentrations of <70^g/L. Monitor well TW4-5, TW4-
6, TW4-8, TW4-9, TW4-16, TW4-24, TW4-26, and TW4-27 have decreasing trends. Monitor well TW4-
18 appears to have a slightly increasing trend with chloroform concentrations ranging between 29 and 38
|ig/L for the last 11 monitonng events (see Table 1 below).
Pumping Wells Chloroform Concentrations
All four pumping wells exceed chloroform concentrations of 70|Lig/L. Pumping wells MW-4, TW4-4,
TW4-19, and TW4-20 show decreasing trends and pumping well MW-26 show an increasing trend (see
Table 1 below).
Monitor Wells Below the Detection Limit
The following monitor wells are below laboratory detection limit for chloroform (1.0 ]XgfL): MW-32,
TW4-3, TW4-12, TW4-13, TW4-14, TW4-23, and TW4-25 (see Table 1 below).
Nitrate. Nitrate + Nitrite ("nitrate") Concentrations
Monitor wells TW4-20, TW4-21, TW4-22, TW4-24, and TW4-25 all exceed the nitrate GWQS of 10 mg/l.
All of these nitrate exceedances for these wells appear to be a result of the nitrate contaminant plume up-
gradient ofthe chloroform contaminant plume. This nitrate contaminant plume is being addressed under
the Nitrate Corrective Action Plan, approved on December 12,2012.
During the review ofthe 3rd quarter 2012 chloroform monitoring report, it was observed that nitrate
exceeded its GWQS (10 mg/L) in well TW4-12 in the 3"* quarter 2012 monitoring event (13 mg/l) and well
TW4-27 exceeded nitrate GWQS in the last three consecutive quarterly monitoring events (1st quarter
2012 = 24 mg/l, 2nd quarter 2012=41 mg/l, 3rd quarter 2012= 37mg/l). For tiie 4* quarter 2012
monitoring event wells TW4-12 and TW4-27 continued to exceed nitrate GWQS at 13 mg/l and 36 mg/l
respectively.
On January 31, 2013 DRC in a conference call with EFR agreed that the recent nitrate concentrations
observed in monitor well TW4-12 and TW4-27 have exceeded the 10 mg/l and that a nitrate contamination
investigation at wells TW4-12 and TW4-27 will be conducted. On February 6,2013 EFR submitted to
DRC a 14 day notice for the installation of the four new wells, new well locations, and a schedule for when
these wells would be drilled and installed, well developed, hydraulically tested, and sampled. Three of
these new wells will be installed down-gradient of well TW4-27 and one new will be installed down-
gradient of TW4-12. In addition EFR will: 1) submit within 60 calendar days of completing new well
installation, an As-Built report for these wells to document said well construction for Director approval
and; 2) on or within 60 calendar days of receipt of receiving the analytical data for the 2nd quarter of
2013 new wells sampling, EFR will submit a Contamination Investigation Report.
Page 5
On February 14,2013, DRC sent a confirmatory action letter to EFR confirming their commitment to the
nitrate contamination investigation activities.
Conclusions on Compliance with the Permit and QAP
Per the DRC review it appears that the Report complies with Permit and QAP. Therefore a letter will be
drafted for the Director Signature, notifying EFR of the review and closing-out of the 4th Quarter 2012
Chloroform Monitoring Report for the chloroform contamination investigation.
Page 6
References
Energy Fuels Resources (USA) Inc., June 7,2012 White Mesa Uranium Mill, Ground Water Monitonng
Quality Assurance Plan (Revision 7.2).
Energy Fuels Resources (USA) Inc., February 18, 2013 White Mesa Uranium Mill Chloroform Monitoring
Report 4th Quarter (October through December 2012).
Energy Fuels Resources (USA) Inc., February 6,2013,14-day Notification for Installation of Four
Additional Monitoring Wells.
State of Utah Division of Water Quality Department of Environmental Quality, August 24,2012, Ground
Water Discharge Permit for Denison Mines (USA) Corp. at the White Mesa Mill Facility Near Blanding,
Utah.
State of Utah Division of Water Quality Department of Environmental Quality, August 23,1999,
White Mesa Uranium Mill: Notice of Violation and Groundwater Corrective Action Order, Docket No
UGW-20-01.
State of Utah Division of Water Quality Department of Environmental Quality, January 2009, Stipulated
Consent Agreement, UDEQ Docket No. UGW-09-03.
Utah Division of Radiation, February 14, 2013, Nitrate Contamination Investigation. Nitrate
Concentrations Exceeding the Groundwater Quality Standard in Monitor Wells TW4-12 and TW4-27.
Confirmatory Action Letter.
TABLE 1
Histonc Summary Of Monitoring Parameters Up To The 4th Quarter 2012
Chloroform Contamination Investigation
OUSAWhite Mesa Mill
Well Parameter
Sampling Event GWQS
Carbon Tetrachloride Chloride Chloroform Chloromethane Methylene Chloride Nitrate, Nitrate Nitnte
(5 MO/L)
(mg/L)
[No GWQS (70 ug/L) (30 pg/L) (5 MO/L) (10 mg/L)
MW-4
1st Qtr 3/16/05 NA NA 2;900 NA NA 63
2nd Qtr 5/25/05 NA NA 3.170 NA NA 7 1
3rd Qtr 8/31/05 <10 NA 3,500 <10 <10 70
4th Qtr 12/7/05 <50 53 3.000 <50 <50 7 0
1stQtr3/9/0~6 <50 " 49 3.100 <5(>" <50 60
2nd Qtr 6/14/06 <50 49 3.000 <50 <S0 6 0
3rti Qtr 7/20/06 <50 48 2.820 <50 <S0 1 2
4th Qtr 11/8/06 21 50 2.830 1 4 <1 0 64
1st Qtr 2/28/07 T6 "47 2,300 <1 0 " ' <i o" " " 6"3
2nd Qtr 6/27/07 1 8 45 2.000 <1 0 <1 0 7 0
3rd Qtr 8/15/07 19 47 2.600 <1 0 <1 0 6 2
4th Qtr 10/10/07 1 7 45 2.300 <1 0 <1 0 6 2
1st Qtr 3/28/08 1 7 42 2,400 <1 0 <i 6 •" 58
2nd Qtr 6/25/08 1 8 42 2.500 <1 0 <1 0 61
3rb Qtr 9/10/08 1 8 35 1.800 <1 0 <1 0 64
4th Qtr 10/15/08 1 7 45 2.100 <1 0 <1 0 59
ist'dtr 3/4/09 1 5 ~ 37 2.200 <10 "" <1 o"" ""5"7
2nd Qtr 6/23/09 1 3 34 1.800 <1 0 <1 0 '52
3rd Qtr 9/14/09 1 4 43 2,000 <1 0 <1 0 53
4th Qtr 12/14/09 1 6 44 1.800 <1 0 <1 0 58
1st Qtr 2/17/10 1 2 45 1.600 <1 0 <1 "o" - - - -2nd Qtr 6/14/10 1 2 41 2.100 <1 0 <1 0' 51
3rd Qtr 8/6/10 1 5 38 1,900 <1 0 <1 0 4 8
4th Qtr 10/15/10 1 4 41 1,500 <1 0 <1 0 4 9
1st cSr 2^3/11"" 1 5 40 1,700 <1 0 <1 0 46
2nd Qtr 6/1/11 1 4 35 1.700 <1 0 <1 0 4 9
3rd Qtr 8/17/11 1 1 41 1.700 <'l 0 <i 6 4 9
4th Qtr 11/16/11 1 3 40 1,600" <1 0 <1 0 51
ist Qtr 1/23/12" " 1 4l' 1.500 <1 0 <1 0 4 8
2nd Qtr 6/6/12 1 2 39 1,400 <1 0 <1 0 49
3rd Qtr 9/4/12 1 5 41 1.500 <1 0 <1 0 '5 0
4th Qtr 10/4/12 1 41 1,300" <i"o <1 0 48
MW4A(TW4^
1st Qtr 3/16/05 NA NA 3J00 NA NA 71
2nd Qtr 5/25/05 NA NA 3.740 NA NA 78
3rdQtra«1/05 <10 NA 3.800 <10 <10 69 4th Qtr 12/7/05 <50 55 3,000 <50 <50 6 7
1st Qtr 3/9/06 <50 53 3.700 isb <50 58
2nd Qtr 6/14/06 <S0 54 3,30Q <50 <50 7 3
3rd Qtr 7/20/05 <S0 54 3.190 <50 <50 12
4th Qtr 11/8/05 24 54 3.370 <1 0 <1 0 71
Ist'Qtir 2/28/07 " 1 9 "60 2,500 <1 0 <1 0 71
Well atjandonded
MW.26 (former T
1st Qtr 3/16/05
W4-15)
NA NA '•""310 NA NA 0 3
2nd Qtr 5/25/05 NA NA 442 NA NA 02
3rd Qtr 8/31/05 <5 0 NA 960 54 <5 0 0 2
4th Qtr 12/7/05 <50 55 1,000 <50 <50 03
1st Qtir"3/9/06 <50 52 1,100 <50 <50" ~ 0~2
2nd Qtr 6/14/06 <50 52 830 <50 <50 0 2
3rd Qtr 7/20/06 <50 65 2.170 <S0 <S0 1 4
4th Qtr 11/8/06 <1 0 54 282 <1 0 26 03
1st Qtr 2/28/07 <1 0 56 570 <1 0 55 06
2nd Qtr 6/27/07 <1 0 49 300 <1 0 13 04
3rd Qtr 8/15/07 <1 0 57 1.400 <1 0 38 1
4th Qtr 10/10/07
1stQtr3/2"8/08
<1 0 57 2.000 <1 0 14 06 4th Qtr 10/10/07
1stQtr3/2"8/08 <i"o 49 930 <1 0 40 " 0 1
2nd Qtr 6/25/08 <1 0 '57 1,300 <1 0 53 0"6
3rd Qtr 9/10/08 <1 0 44 630 <1 0 " 24 02
4th Qtr 10/15/08 NA 64 NA"' NA NA 01
4th Qtr 11/18/09 <2 0 NA " 1.700" <2 0 "Too NA
ist Qtr 3/4/09 <10"~ 49 950 <1 o" 51 04
2nd Qtr 6/23/09 <1 0 48 410 '<1 o' 12 0 2
3rd Qtr 9/14/09 <1 0 46 850" <1 0 30 0 1
41h Qtr 12/14/09 <1 0 60 1,100 <1 0 40 23
1stQtr2/17/id " <1 0 57 730 <1 0 19 0 2
2nd Qtr 6/14/10 1 2 40 1,600 <1 0 <i 6 68
3rd Qtr 8/16/10 <1 0 49 2,200 <1 0 21 06
4th Qtr 10/15/10 <1 0 65 970 <1 0 6"5 07
1stQtf2>23/11 <ro " 57 450 <1 0 "~3"6 "0"5
2nd Qtr 5/31/11 <1 0 88 1,800 <1 0 1 3 04
3rd Qtr 8/17/11 <1 0 58 _, J20 <1 0 7 2 09
4th Qtr 11/16/11 69 20
•''12/5/11 <1 0 1,800 <1 0 2 9
1st Qtr 2/7/12 ~ <ro "98 2,400 <1 0 16 .„
2nd Qtr 6/6/12 <1 0 73 3,00C <1 0 21 25
3rd Qtr 9/4/12 <1 73 3.100 <1 31 2 6
4th Qtr 10/4/12 <1 68 1,200 <1 " "4 1 8
(1) VOCs viere resampled because laboratory missed holding I
NA = not analyzed
NS = not sampled
Shaded indicates concentrations exceeding GWQS
Bold and red = highest concentration since montionng started
Bold and t>lue = lowest concentration since montionng started
Bold and italics indicates the MDL exceeded the GWQS
1st Qtr = January - March
2nd Qtr = Apnl - June
3rd Qtr = July - September
4th Qtr = October - December
TABLE 1
Historic Summary Of Monitoring Parameters Up To The 4th Quarter 2012
Chloroform Contamination Investigation
DUSA White Mesa Mill
Well Parameter
Sampling Event GWQS
Carbon Tetrachloride Chlonde Chloroform Chloromethane Methylene Chloride Nitrate, Nitrate ••• Nitrite
(5 pg/L)
(mg/L)
No GWQS (70 pg/L) (30 pg/L) (5 pg/L) (10 mg/L)
MW.32 (former T
1st Qtr 3/16/05
W4.17)
NA NA <1 0 NA NA <01
2nd Qtr 5/25/05 NA NA <1 0 NA NA " <o r 3K1 Qtr 8/31/05 <1 0 NA <1 0 3 2 <1 0 <0 1
4th Qtr 12/7/05 <1 0 33 <1 0 <1 0 <1 0 <01
1st Qtr 3/9/06 <1 o"" "32 <i"o <io <io" """ <o"i
2nd Qtr 6/14/06 <1 0 30 <1 0 35 <1 0 " <"0 1
3rd Qtr 7/20/06 <1 0 32 <1 0 1 8 <1 0 <1 0
4th Qtr 11/8/06 <1 0 31 <1 0 1 5 <1 0 < 1
1st Qtr 2/28/07 <1 0 32 <i"o <1 0 <1 0 <1 0
2nd Qtr 6/27/07 <1 0 32 <1 0 <1 0 •<i 0 <1 0
3rd Qtr 8/15/07 <1 0 31 <1 0 <1 0 <1 o' <i o'
4th Qtr 10/10/07 <1 0 32 <1 0 <1 0 <1 0 <1 0
1st Qtr 3/28/08 <1 0 31 <1 0 <1 0 <io" <1 "
2nd Qtr 6/25/08 <1 0 29 <1 0 <1 0 <1 0 <1 0
3rd Qtr 9/10/08 <1 0 30 <1 0 <1 o" "<io <i 0
4th Qtr 10/15/08 <1 0 26 <1 0 <1 0 <1 0 <0 05
1st Qtr 3/4/09 <To"""" 30' <1 0 <1 0 <1 0 < r " 2nd Qtr 6/23/09 <1 0 31 <1 0 <1 0 <1 0 <01
3rd Qtr 9/14/09 <1 0 33 <1 0 <1 0 <1 0 <0 1
4th Qtr 12/16/09 <1 0 35 <i"o <1 0 <1 0 <01" '
1stQtr2/l"7/10 <i"o" "38 <i"o" <i'd <i o" <0 1 "" "
2nd Qtr 6/14/10 <1 0 32 <1 0 <1 0 <1 0 <01
3rd Qtr 8/16/10 <1 0 28 <1 0 <1 0 <1 0 <01
4th Qtr 10/15/10 <1 0 24 <1 0 <1 0 <1 0 <01
1st Qtr 2/23/11 <1 0 40 <ro" <i 6" "<i 6 <01
2nd Qtr 5/25/11 «:1 0 31 <1 0 <1 0 <1 0 <01
3rd Qtr 8/16/11 <1 0 33 <1 0 <1 0 <1 0 <01
4th Qtr 11/16/11 32 <0 1
"'12/7/11 <1 0 <1 0 <1 0 <1 o"
TstQti-"l/18/i2"" <ro" 21 <1 0 <1 0 <1 0 ~ "<01
2nd Qtr 6/22/12 <1 0 32 <1 0 <1 0 <1 0 <01
3rd Qtr 9/5/12 <1 0 33 <1 0 <1 0 •<:1 0 " <01 '
4th Qtr 10/10/12 <1 0 35 <1 0 <1 0 <1 0 <0 1
TW4.1
1st Qtr 3/16/05 NA NA 2,700 NA NA 91
2nd Qtr 5/25/05 NA NA 3,080 NA NA • 10 6
3rd Qtr 8/31/05 <10 NA 2,900 <10 <10 98
4th Qtr 12/7/05 <50 52 2,400 <50 <so 97
1st Q"tr 3/9/06 " <50 49 2,700 <50 <50 94
2nd Qtr 6/14/06 <50 "48 2,200 <S0 <50 9 6
3rd Qtr 7/20/06 <50 51 2,840 <50 <50"
4th Qtr 11/8/06 1 4 47 2,260 <1 0 <1 0 92
1st Qtr 2/28/07 47 1,900 <1 0 <ro ""8 9
2nd Qtr 6/27/07 14 45 1,900 <1 0 <1 0 9
3rd Qtr 8/15/07 1 3 43 2,300 <1 0 <10" "8 4
4th Qtr 10/10/07 1 3 43 2,000 <i"o <1 0 78
1st Qtr 3/28/08 " " " 1 3 "39 2,000 <1 0 <1 0 76
2nd Qtr 6/25/08 1 1 39 1,900 <1 0 <1 0 8 68
3rd Qtr 9/10/08 1 3 35 1.700 <i"o <1 0 815
4th Qtr 10/15/08 1 3 41 1.700 <1 0 " <1 0 9 3
1st Qtr 3/11/09 1 1 37 1.700 <ro <1 0 7"5
2nd Qtr 6/23/09 1 37 1.500 <1 0 <1 0 6 9
3rd Qtr 9/14/09 <1 0 36 1,700 <1 0 " <1 0 73
4th Qtr 12/29/09 <1 0 "41 1,400 <i o' <i 0 6 8
ist"Qtf3;ano"" <Tci~ 35 1.300 <1 0 <1 0 7 1
2nd Qtr 6/14/10 1 2 40 1.600 <1 0 <1 0 68
3rd Qtr 8/18/10 1 35 1,600 <1 0 <1 0 67
4th Qtr 10/15/10 <1 0 40 1^500 <1 0 <1 0 66
1stQtr"2/24/1~r" <i"o "" " "41 1,300 <1 0 <i o" "66
2nd Qtr 6/1/11 <1 0 35 1,200 <1 0 <1 0 ' 66
3rd Qtr 8/18/11 <1 0 36 1,300 <1 0 <1 0 68
4th Qtr 11/29/11 <1 0 40 1,500 <1 0 <1 0 66
1st Qtr 1/24/12 <1 0 ^38 1.300 <1 0 <1 0 68
2nd Qtr 6/14/12 <1 0 42 i.obd <1 0 <i o" 7 1
3rd Qtr 9/28/12 <1 0 39 1,000 <1 0 <1 0 50
4th Qtr 10/4/12 <1 0 40 1.100 <1 0 <1 0 6 5
(1) VOCs were resampled because laboratory missed holding t
NA = not analyzed
NS = not sampled
Shaded indicates concentrations exceeding GWQS
Bold and red = highist concentration since montionng started
Bold and blue = lowest concentration since montionng started
Bold and italics indicates the MDL exceeded the GWQS
1st Qtr = January - March
2nd Qtr = Apnl - June
3rd Qtr = July - September
4th Qtr = October - December
TABLE 1
Histonc Summary Of Monitonng Parameters Up To The 4th Quarter 2012
Chloroform Contamination Investigation
DUSAWhite Mesa Mill
Well Parameter
Sampling Event GWQS
Carbon Tetrachloride Chloride Chloroform Chloromethane Methylene Chloride Nitrate, Nitrate ••• Nitrite
(5 pg/L) (mo/L)
No GWQS (70 pg/L) (30 pg/L) (5 pg/L) (10 mg/L)
TW4.2
1st Qtr 3/16/05 NA NA "3jdo NA NA 77
2nd Qtr 5/25/05 NA NA 3.750 NA NA 86
3rd Qtr 8/31/05 <10 NA 3.900 <i"o <10 8 0
4th Qtr 12/7/05 <so 56 3.500 <50 <50 78
1st Qtr 3/9/06 <50 56 3,800 <50" ' <sb" """7"5'
2nd Qtr 6/14/06 <50 56 3,200 <S0 <50 71
3rd Qtr 7/20/06 <50 54 4,120 <S0 <50 74
4th Qtr 11/8/06 23 55 3,420 <1 0 <1 0 7" 6
1st Qtr 2/28/07 r8 54 2,300 <1 0 <1 0 73
2nd Qtr 6/27/07 25 50 3,000 <1 0 <1 0 78
3rd Qtr 8/15/07 22 49 340(7) <1 0 <1 0 73
4th Qtr 10/10/07 21 51 3,200 <1 0 <1 0 69
1St"Qtr3/28/0"8 23 48 3,300 <10"" < 1 0 6"9
2nd Qtr 6/25/08 22 46 3,100 <1 0 <1 0 74
3nj Qtr 9/10/08 24 42 2,800 <1 0 " <1 0 7 1
4th Qtr 10/15/08 NA 47 NA ' NA 80
4th Qtr 11/18/09 24 NA_ _ "3;20b <2 0 <2 0 NA
ist"Qtr37ll7o"9 """22" 46 3,100 <1 0 <i 0 65
2nd Qtr 6/23/09 2 44 2,800 <1 0 <i 0 64
3rd Qtr 9/14/09 2 43 3,000 <1 0 <10 6 6
4th Qtr 12/29/09 2 46 1.600 <1 0 <i 0 " 64
1st Qtr 3/3/10" "• '2 42 2,600 <1 0 <i 0 68
2nd Qtr 6/14/10 26 43 3.300 <1 0 <i 0 87
3rd Qtr 8/18/10 25 43 3.300 <1 0 <i 0 66
4th Qtr 10/15/10 21 41 3,000 <1 0 '<i 0 "6 5
ist"Qtr2/24/l"l 24 46 3,100 <i"o <"ro" 70
2nd Qtr 6/2/11 22 42 3,000 <1 0 <i 0 6 8
3rd"Qtr 8/17/11 1 6 48 2,400 <1 0 <i 0 60
4th Qtr 11/29/11 28 49 3.900 <1 0 <i 0 7 0
is"t"Qtr 1T24/12 2 "49 2.500 <1 0" " <i 0 71
2nd Qtr 6/14/12 2 1 52 2,500 <i'o <i 0 7 7
3rd Qtr 9/28/12 1 8 76 2,900 <1 0 " <i 0 40
4th Qtr 10/4/12 2 49 3,100 <1 0 <i 0 76
TW4-3
1st Qtr 3/16/05 NA NA <1 0 N/\ NA """35
2nd Qtr 5/25/05 NA NA <1 0 NA NA 37
3rd Qtr 8/31/05 <1 0 NA <1 0 64 <1 0 35
4th Qtr 12/7/05 <1 0 26 <1 0 <\0 _ _'_ ^ <i"o 33
1st Qtr 3/9/06 <1 0 26 <"i 0" 2 3 <1 0 33
2nd Qtr 6/14/06 <1 0 26 <1 0 1 6 <1 0 7'i
3rd Qtr 7/20/06 <1 0 26 <1 0 22 <1 0 29
4th Qtr 11/8/06 <1 0' 23 <1 0 <1 0 <1 0 1 5
1st Qtr 2/28/07 •<1 0"" " 22 <1 0 <1 0 <1 0 """" 3"l
2nd Qtr 6/27/07 <1 0 23 <1 0 <1 0 <1 0 3 3
3rd Qtr 8/15/07 <1 0 ' 24 <1 0 <1 0 <1 0 31
4th Qtr 10/10/07 <1 0 27 <1 0 <1 0 <1 0 28
i'stQtr3/28/0"8"" <1 0 21 <1 0 <ro <" 1 0 " 28'
2nd Qtr 6/25/08 <1 0 19 <1 0 <1 0 <1 0 " 2 9
3rd Qtr 9/10/08 <1 0 19 <1 0 <1 0 <1 0 27
4th Qtr 10/15/08 <1 0 22 <1 0 <1 0 <1 0 2 6
1st Qtr 3/4/09 <1 0" "" 21 <1 0 <i o"~ <1 0 25
2nd Qtr 6/23/09 <1 0 20 <1 0 <1 0 <1 0 29
3rd Qtr 9/14/09 <1 0 21 <1 0 <1 0 <1 0 28
4th Qtr 12/29/09 <1 0 22 <1 0 <1 0 <1 0 26
1st Qtr 2/23/10"" <ro" 23 <1 0 <rd" <10 " 28
2nd" Qtr 6/14/10 <1 0 24 <1 0 <1 0 <1 0 30
3rd Qtr 8/10/10 <1 0 22 •:1 0 <1 0 <1 0 31
4fh Qtr 10/15/10 <1 0 26 <1 0 <1 0 <^o' ~ "33
ist"Qtf2/15/Ti'" •<ro 23 <1 0 "<i"6" <10 " "" ~ 3 5
2nd Qtr 5/25/11 <1 0 23 <1 0 <1 0 <1 0 3 7
3rd Qtr 8/16/11 <1 0 23 •il 0 <1 0 <^ 0 4 0
4th Qtr 11/14/11 <1 0 23 <^ 0 <1 0 <^ 0 44
1stQtr1/17/1~2 " <ro 21 <1 0 <i"o" <10 71
2nd Qtr 5/31/12 <1 0 24 «:1 0 <1 0 <i 0 44
3rd Qtr 8/29/12 <1 0 25 <1 0 <1 0 <i 6 49
4th Qtr 10/3/12 <1 0 25 <1 0 <1 0 <i 0 4 8
NA = not analyzed
NS = not sampled
Shaded indicates concentrafaons exceeding GWQS
Bold and red = highist concentration since montionng started
Bold and blue = lowest concentration since montionng started
Bold and italics indicates the MDL exceeded the GWQS
1st Qtr = January - March
2nd Qtr = Apnl - June
3rd Qtr = July - September
4th Qtr = October - December
TABLE 1
Historic Summary Of Monitonng Parameters Up To The 4th Quarter 2012
Chloroform Contarrunation Investigation
DUSAWhite Mesa Mill
Well
Sampling Event
Carbon Tetrachloride
(5 pg/L)
Chloride
(mg/L)
No GWQS
Parameter
GWQS
Chloroform
(70 pg/L)
Chloromettiane
(30 pg/L)
Methylene Chlonde
(5 pg/L)
Nitrate, Nitrate + Nitrite
(10 mg/L)
TW4.4
1st Qtr 3/16/05
2nd Qtr 5/25/05
3rd Qtr 8/31/05
4th Qtr 12/7/05
1st Qtr 3/9/06
2nd Qtr 6/14/06
3rd Qtr 7/20/06
4thQtr11/8/06_
'1st Qtr"2/2'8/d7
2nd Qtr 6/27/07,
3rd Qtr 8/15/07
4th Qtr 10/10/07
1stQtr~3/28/6"8"
2nd Qtr 6/25/08
3rd Qtr 9/10/08
4th Qtr 10/15/08
4th Qtr 11/18/09
NA
NA
<10
<50
<5b
<50
<50
NA
<2 0
1st Qtr 3/4/09
2nd Qtr 6/23/09
3rd Qtr 9/14/09
4th Qtr 12/29/09
1st Qtr"2/17/10""
2nd Qtr 6/14/10
3rd Qtr 8/10/10'
4th Qtr 10/15/10
1st Qtr 2/23/11
2nd Qtr 6/1/11
3rd Qtr 8/17/11
4th Qtr 11/16/11
'lstQtr"i;^"3/12
2nd Qtr 6/6/12
3rd Qtr 9/4/12
4th Qtr 10/3/12
<1 0
<1 0
<1 0
1 2
1
3,100
2,400
3 200
2,800
2,900
2,600
2.850
2.670
2,200
2,400
2,700
2,500
"2,800
2,500
2,200
2,500
2.200
1.800
2,000
950
1,700
1,700
2,100
1,700
1,800
1,700
1,500
1.500
1.200
1.500
1.600
1,400
NA
1^
<10
<50
<50 •
<50
<50
<1 o"
<1 0
<1 0
<1 0
<1 0
<1 0
<1 0
<1 0
NA
<2 0
<l"0
<1 0
<1 0
<1_0
"<1 o"
<1 0
<1 0
<1 0
<"i"o"
<'l 0
<1 0
<1 0
<i"o
<ro"
<1 0
<1 0
NA
NA
<fO
<50
<50
<S0
<50
<i o"
<i o"
<1 0
<1 0
<1 0
<"i o"
<i 6'
<i 0
NA
<2 0
10 0
11" 3
9 9
J02
95
86
9 7
io 1
90
94
95
_9 5
9 2
10 8
8 8
idi
<1 0
<1 0
<1 o"
<1 0 <ro"
<1 0
<i d
<1 0 <rd'
<i d
<1 0
<1 0
<i 0
<i 0
<i 0
<1 0
102
82
84
76
66
7 6
73
71
~ 7 0
7d
66
7 0
~ 7 1
7 1
7 1
7 0
rrw4.5
ist Qtr 3/16/05
2nd Qtr 5/25/05
3rd Qtr 8/31/05
4th Qtr 12/7/05
NA
NA
<2 5
<25
1st Qtr 3/9/06
2nd Qtr 6/14/06
3rd Qtr 7/20/06
4th Qtr 11/8/06
1stQ"tr"272"8/d7"
2nd Qtr 6/27/07
3rd Qtr'8/15/07
4th Qtr 10/10/07
<25
<2 5
<1 0
<1 0
1st Qtr 3/28/08
2nd Qtr 6/25/08
3rd Qtr 9/10/08
4th Qtr 10/15/08
1st Qt"r 3/4/09
2nd Qtr 6/23/09
3rd Qtr 9/14/09
4th Qtr 12/29/09
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 o"
<1 0
<1 0
<1 0
-,2G
113
82
__63
6~6
51
53 7
471
"35
26
92
94
NA
NA'
<2 5
<2 5
<1 0
<1 0
"<1 0
<1 o'
<1 0
<1 0
<2 5
<2 5
<1 0
<1 0
<1 0
<1 0
<1 o"
<1 0
<1 0
<1 0
<1 0
<1 0
•<ro""
<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
"'12/7/11
<1 0
<1 0
<1 0
<1 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
<ro
<1 0
<1 0
<1 0
<1 o"
<1 0
<1 0
<1 0
<1 0
<1 0_
<~1 0
<1 0
<1 0
'<i d"
<1 0
<1 0
<1 0
<1 0
<1 0
<io'
<1 0
<1 0
49
37
60
6 0
60
5 9
67
2 9
'~7"8'
70
7 7
8 2
"7 4
87
79
93
' 79
7 5
83
_7 5
6 8
7 1
7 0
_7_2
7d
72
75
6 0
58
80
81
77
(1) VOCs were resampled because laboratory missed holding t
NA = not analyzed
NS = not sampled
Bold and red = highist concentration since montionng started
Bold and blue = lowest concentration since montonng started
Shaded indicates concentrations exceeding GWQS
Bold and italics indicates the MDL exceeded the GWQS
1st Qtr = January - March
2nd Qtr = Apnl - June
3rd Qtr = July - September
4th Qtr = October - December
TABLE 1
Histonc Summary Of Monitoring Parameters Up To The 4th Quarter 2012
Chloroform Contamination Investigation
DUSAWhite Mesa Mill
Well Parameter
GWQS
Carbon Tetrachloride Chloride Chloroform Chloromethane Methylene Chlonde Nitrate, NiUate + Nitrite
(5 pg/L)
(mg/L)
No GWQS (70 pg/L) (30 pg/L) (5 pg/L) (10 mg/L)
TW4^
1st Qtr 3/16/05 NA NA <i'o NA NA 02
2nd Qtr 5/25/05 NA NA 25 NA NA 04
3rd Qtr 8/31/05 <1 0 NA 10 28 <1 0 " 0 8
4th Qtr 12/7/05 <1 0 32 17 1 3 <i 0 09
1st Qtr 3/9/06 <To" 31 "" 3"l <1 0 <i"o 1 2
2nd Qtr 6/14/06 <1 0 30 19 <1 0 <1 0 1 0
3rd Qtr 7/20/06 <1 0 37 11 <1 0 <1 0 06
4th Qtr 11/8/06 <1 0 65 42 8 <1 o" <1 0 1 4
1st Qtr 2/28/07 <1 0 "32 "46" <1 d" <1 0 1 8
2nd Qtr 6/27/07 <1 0 38 11 <1 0 <1 0 0 6
3rd Qtr 8/15/07 <1 0 36 18 <1 0 <1 0 0 7
4th Qtr 10/10/07 <1 0 35 " 18 <1 o' <1 0 08
Tst Qtr 3/28/08 <i d" "33 52 ^10 <1 0 1 "l
2nd Qtr 6/25/08 <1 0 35 24 <1 0 <1 0 0 9
3rd Qtr 9/10/08 <1 0 35 39 <1 0 <1 0 1 1
4th Qtr 10/15/08 <1 0 33 37 <1 0 <1 o' 1 0
1st Qtr 3/11/09 <ro" 35 81 <1 0 "<ro 22
2nd Qtr 6/23/09 <1 0 37 120 <1 0 <i o" 2 7
3rd Qtr 9/14/09 <1 0 37 280 <1 0 <1 0 5 0
4th Qtr 12/29/09 <1 0 41 250 <1 0 <1 0 61
istQtr2/25/id" <1 0 45 <"rd"" <"fo" 1 8
2nd Qtr 6/14/10 <1 0 33 590 <io""' <i d "" 2" 5
3rd Qtr 8/11/10 <1 0 31 630 <1 0 <1 0 39
4th Qtr 10/15/10 <1 0 41 420 <1 0 <1 0 4 3
1st Qtr 2/23/11 <1 0 40 "47 <i"d <1 0 07
2nd Qtr 5/26/11 <1 0 42 96 <1 0 <1 0 03
3n3 Qtr 8/17/11 <1 0 39 16 <1 0 <1 0 03
4th Qtr 11/16/11 36 08
'"12/7/11 <1 0 21 <1 0 <1 0 /\
'^'11/16/11 <1 0 33 50 <1 0 <10 0 8
1st Qtr 1/18/12 <"ro' "38 38 <1 0 "<ro " "0 7
2nd Qtr 6/13/12 <1 0 40 47 <1 0 <1 0 02
3rd Qtr 9/11/12 <1 0 21 69 <1 0 <i o" 01
4th Qtr 10/3/12 <1 0 41 9 <1 0 <1 0 0 2
TW4-7
1st Qtr 3/16/05 NA NA NA NA 5 2
2nd Qtr 5/25/05 NA NA 2,700 NA NA 54
3rd Qtr 8/31/05 <10 NA <10 <10 5 2
4fh Qtr 12/7/05 <50 ' 52 2,500 <50 <so 53
1st Qtr 3/9/06 <S0 "48 1,900 <so "" 1
2nd Qtr 6/14/06 <50 47 2,200 <50 <50 "45
3rd Qtr 7/20/06 <S0 51 2,140 <50 <s6 47
4th Qtr 11/8/06 1 5 49 2,160 <1 0 <1 0 46
1st"crtr 2/28/07" ""11 47 1,830 <1 0 <1 0 "6
2nd Qtr 6/27/07 1 5 45 2,600 <1 0 <1 0 51
3rd Qtr 8/15/07 1 4 44 2,300 <i d "<1 0 '4 7
4th Qtr 10/10/07 1 2 45 1,900 <1 0 <1 0 4 7
istQfr3/28/08~ 1 3 43 2,200 <1 0 " '<i"o 4 2"
2nd Qtr 6/25/08 1 3 43 1,800 <1 0 <1 0 48
3rd Qtr 9/10/08 " 1 4 35 <1 0 <i o" 4 16
4th Qtr 10/15/08 NA 40 NA NA 4 dl
4th Qtr 11/18/09 <2 0 NA 2,5d'd <2 0 <2 0 NA
ist Qtr 3/11/09 "•l"2 35 1,800 <1 0 <1 0 37
2nd Qtr 6/23/09 <1 0 37 1,400 <1 0 <1 0 38
3rd Qtr 9/14/09 1 37 1,500 <"l 0 <1 0 4 1
4th Qtr 12/29/09 <10 37 1,300 <1 0 <1 0 4 2
1st Qtr 3/3/10 <1 0 35 1.200 <1 0 <1 0 38
2nd Qtr 6/14/10" <1 0 31 1,100 <1 0 <1 0 39
3rd Qtr 8/i 1/10 1 36 1.500 <i"o <"i o" 39
4th Qtr 10/15/10 <1 0 38 1,100 <1 0 <1 0 4
1st"Qtr 2/23/11" •<i o" 45 1.300 <1 0 <10 36
2nd Qtr 6/1/11 <1 0 35 1,2d0 <1 0 <1 0 40
3rd Qtr 8/18/11 <1 0 37 1.200 •<i'o <1 0 41
4th Qtr 11/29/11 <1 0 37 1,000 <1 0 <i d 38
1st Qtr 1/19/12 <1 0 37 1,000 <1 0 <1 0 39
2nd Qtr 6/14/12 <1 0 41 / <1 0 <1 0 40
3rd Qtr 9/13/12 <1 0 40 870 <1 0 <1 0 38
4th Qtr 10/4/12 <1 0 41 940 <1 o' <io 3" 8
(1) VOCs were resampled because laboratory missed holding t
(2) Results of the TW4-70 the duplicate sample for TW4-6
NA = not analyzed
NS = not sampled
Shaded indicates concentrations exceeding GWQS
Bold and red = highest concentration since montionng started
Bold and blue = lowest concentration since montionng started
Bold and italics indicates the MDL exceeded the GWQS
1st Qtr = January - March
2nd Qtr = Apnl - June
3rd Qtr = July - September
4th Qtr = October - December
TABLE 1
Historic Summary Of Monitoring Parameters Up To The 4th Quarter 2012
Chloroform Contamination Investigation
DUSA White Mesa Mill
Well Parameter
Sampling Event GWQS
Carbon Tetrachlonde Chloride Chloroform Chloromethane Methylene Chloride Nitrate, Nitrate + Nitnte
(5 pg/L) (mg/L)
No GWQS (70 pg/L) (30 pg/L) (5 pg/L) (10 mg/L)
TW4.8
1st Qtr 3/16/05 NA NA 10 NA " NA <di
2nd Qtr 5/25/05 NA NA <1 0 NA NA 0 2
3rd Qtr 8/31/05 <1 0 NA 11 1 7 NA <1 0
4th Qtr 12/7/05 <i"o 41 <1_0_ <1i 0 <1 0 <1 0_
1st Qtr 3/9/06 '<10 "~ "39 ~"i"3 "21 <i"o "7 03 2nd Qtr 6/14/06 <1 0 37 1 8 1 0 <1 0 <1 0
3rd Qtr 7/20/06 <1 0 39 <1 0 <1 0 <1 0 0 1
4th Qtr 11/8/06 <1 0 40 <i d <1 0 <1 0 <i
1st Qtr 2/28/07 <1 0 39 25 <1 0 <1 0 07
2nd Qtr 6/27/07 <1 0 42 25 <i"o <1 0 02
3rd Qtr 8/15/07 <1 0 42 1 5 <1 0 <1 0 <1 0
4th Qtr 10/10/0"7 <1 0 43 35 <1 0 <1 0 05
ist Qtr 3/28/08"" •<i d"' 46 <1 0 "<1 0 <i"o 0 1
2nd Qtr 6/25/08 <1 0 45 <1 0 <1 0 <1 0 " <i"o
3rd Qtr 9/10/08 Vi 0 39 <1 0 <1 0 <1 0 <0 05
4th Qtr 10/15/08 <1 0 44 <1 0 <1 0 <1 0 <0 05
1st Qtr 3/4/09 '<i"o"" 42 "<i"o •^10"" <1 d <di"""
2nd Qtr 6/23/09 <1 0 44 <1 0 <1 0 <1 o" <0l'
3rd Qtr 9/14/09 <1 0 44 <1 0 <1 0 <1 0 <0 1
4th Qtr 12/17/09 <1 0 51 <1 0 <1 0 <1 0 <0 1
1st Qtr 2/24/10 <1 0 ""57 <1 0 '<i d" <i"o <or 2nd Qtr 6/14/10 <io ' "42 <i d <1 0 <i 0" " ' <01 3rd Qtr 8/18/10
4th Qtr 10/15/10
<1 0 45 <1 0 ' <1 0 <1 o" " <di 3rd Qtr 8/18/10
4th Qtr 10/15/10 <1 0 46 <1 0 <1 0 <1 0 01
TstQtr27l"67li" <1 0 52 <1 0 <i o" <i~o <oi • 2nd Qtr 5/25/11 <1 0 45 <1 0 <1 0 <1 0 0 1 3rd Qtr 8/16/11 <1 0 46 <1 0 "<1 0 <"l 0 01
4th Qtr 11/16/11 45 02
"'12/7/11 <1 0 <1 0 <1 0 <1 0
1st Qtr 1/18/12 <1 0 45 <i d <1 0 <1 0 0'3
2nd Qtr 5/13/12 <1 0 44 <1 0 <1 0 <1 0 0 2
3rd Qtr 8/29/12 <1 0 48 <1 0 <1 0 <1 0 01
4th Qtr 10/3/12 <1 0 47 <1 0 <1 0 <1 0 <01
TW4.9
1st Qtr 3/16/05 NA NA 38 IMA NA 1 3
2nd Qtr 5/25/05 NA NA 1 2 NA NA 1 3
3rd Qtr 8/31/05 <1 0 NA <1 0 2 9 <1 0 1 3
4th Qtr 12/7/05 <1 0 42 <1 0 <1 0 <1 0 1 3
1st Qtr 3/9/06 <1 0 38 <1 0 26 <1 0 ._ ^.^ 2nd Qtr 6/14/06 <1 0 "39 19 27 <i"o ^~5
3rd Qtr 7/20/06 <1 0 41 <1 0 <1 0 <1 0 09
4th Qtr 11/8/06 <1 0 44 <1 0 <1 0 <1 0 07
ist~Q"tr272'8707" "<i"o" 44 <i o" <i"d <1 0 • ~"O 6
2nd Qtr 6/27/07 <1 0 42 21 <1 0 <1 0 l"3
3rd Qtr 8/15/07 <1 0 38 95 <1 0 " <1 0 1 8
4th Qtr 10/10/07 <1 0 40 87 <1 0 <1 0 2
1st"Qt7"3/2"8/08 <1 0 35 """l"3" <1 0 <io 21
2nd Qtr 6/25/08 <1 0 35 1 <1 0 <i d 23
3rd Qtr 9/10/08 <1 0 28 <1 0 <i'd <1 0 2 79
4th "Qtr 10/15/08 <1 0 58 <1 0 <1 0 <1 0 1 99
1st Qtr 3/4/09 <ro"" 30 <1 0 <1 0 <1 0 " ~ 25
2nd Qtr 6/23/09 <1 0 30 <1 0 <1 0 <1 o" 23
3rd Qtr 9/14/09 <1 0 3d •<i 0 <i"o <1 0 25
4th Qtr 12/17/09 <1 0 37 <1 0 <1 0 <1 0 1 7
1st Qtr 2/23/10 <1 0 "' 47 <1 0 <i 0 <1 0 1~4
2nd Qtr 6/14/10 <1 0 33 <1 0 <1 0 <1 0 1 5
3rd Qtr 8/13/10 <1 0 40 <1 0 <i d <1 0 1 2
4th Qtr 10/15/10 <1 0 34 <1 0 <1 0 <1 0 " i 8
istQ"tr2/17/ii <1 0 41 <"i"d" <"i d" <i"d " " " • i'3 2nd Qtr 5/25/11 <1 0 38 <1 0 <1 0 <1 0 34
3rd Qtr 8/16/11 <1 0 21 <1 0 <1 0" <1 0 4
4th Qtr 11/16/11 38 23
(1)12/7/11 <1 0 <1 0 <1 0 <1 0 1st Qtr 1/18/12 <i"d""" 28 <1 0 <1 0 <i"o 2"3
2nd Qtr 5/31/12 <1 0 23 <1 0 "<1 0 <1 0 40
3rd Qtr 8/30/12 <1 0 22 <1 0 <"l 0 <1 0 ' 39
4th Qtr 10/3/12 <1 0 21 <1 0 <i"o <1 0 38
NA = not analyzed
NS = not sampled
Shaded indicates concentrations exceeding GWQS
Bold and red = highest concentration since montionng started
Bold and blue = lowest concentration since montionng started
Bold and italics indicates the MDL exceeded the GWQS
1st Qtr = January - March
2nd Qtr = Apnl - June
3rd Qtr = July - September
4th Qtr = October - December
TABLE 1
Historic Summary Of Monitonng Parameters Up To The 4th Quarter 2012
Chloroform Contamination Investigation
DUSAWhite Mesa Mill
Well Parameter
Sampling Event GWQS
Carbon Tetrachloride Chloride Chloroform Chloromethane Methylene Chlonde Nitrate, Nitrate + Nitrite
(5 pg/L)
(mg/L)
[No GWQS (70 pg/L) (30 pg/L) (5 pg/L) (10 mg/L)
TW4-10
1st Qtr 3/16/05 NA NA _.. NA NA 1 6
2nd Qtr 5/25/05 NA NA '"•g2 4 NA NA 08
3rd Qtr 8/31/05 <25 NA 110 6 2 <2"5 1 1
4th Qtr 12/7/05 <2 5 52 300 <2 5 <2 5 33
ist'dtr 3/9/06" <5 0 50 190 "<5 0 """ <5 0 "~2"4
2nd Qtr 6/14/06 <50 "54 300 <5 0 <5 0 3 5
3rd Qtr 7/20/06 <50 "61 504 <5 0 <5 0" 68
4th Qtr 11/8/06 <1 0 58 452 1 6 <1 0 57
1st Qtr 2/28/07 '<i"o" 500 <1 d <1 0 7 3
2nd Qtr 6/27/07 <1 0 54 350 <1 0 <1 0 51
3rd Qtr 8/15/07 <1 0 59 660 <1 0 <1 0 73
4th Qtr 10/10/07 <1 0 59 470 <1 0 <1 0 67
1st Qtr 3/28/08 <1 0 ~55 620 <1 0 " <1 0 73
2nd Qtr 6/25/08 <1 0 58 720 <1 0 " <1 o" 9 9
3rd Qtr 9/10/08 <1 0 51 ... ,660 <1 0 <1 0 9 23
4th Qtr 10/15/08 NA 61 NA_ NA NA ids
4th Qtr 11/18/09 <2 0 NA_ <2 0 <2 0 NA
1stQ"tr3/l'i/09"" <"i"o '64' 1,100 <1 0 <1 o" 11 6
2nd Qtr 6/23/09 <1 0 62 <1 0 <1 0 ""9 8
3rd Qtr 9/14/09 <1 0 51 910 <1 0 <1 0 81
4th Qtr 12/22/09
Ist'Qtir 3/3/10
<1 0
"<1~0
51
"48'
300
460
<1 0
"<1 0
<1 0
<"i"o
38
5 0
2nd Qtr 6/14/10 <1 0 42 220 <1 0 <1 o" 1 6
3rd Qtr 8/i 2/10 <1 0 38 100 <1 0 <1 0 0 8
4th Qtr 10/15/10 <1 0 52 1100 <1 0 '<1 0 11 0
ist"Q"tr2^3/11 <1 0 ~~32" 620 <i o" <"i d 90
2"nd Qtr 6/14/11 <1 0 42 280 <1 0 <"l 0 33
3rd Qtr 8/17/11 <1 0 41 180 <1 0 <1 0 1 9
4th Qtr 11/16/11 <1 0 45 110 <1 0 <1 0 1 1
1st Qtr 1/19/12 <i"o 40 --<i o"" ~ <ro' 0 9
2nd Qtr 6/14/11 <1 0 46 79 <1 0 <1 0 08
3rd Qtr 9/12/12 <1 0 44 130 <1 0 "<1 0 "l 0
4th Qtr 10/3/12 <1 0 "45 140 <1 0 " <1 0 1 6
TW4-11
1st Qtr 3/16/05 NA NA NA NA 87
2nd Qtr 5/25/05 NA NA 3,590 NA NA "10 3
3rd Qtr 8/31/05 <10 NA 4,400 <10 " <io " " •"""• """9"4
4th Qtr12A7/05 <100 '58 4,400 <100 <iod 94
1st Qtr 3/9/06 '^0 56 4,400 <50 <so 9" 2
2nd Qtr 6/14/06 <50 56 4,300 <50 <so 10 d
3rd Qtr 7/20/06 <50 55 4,080 <50 <50" 10 0
4th Qtr 11/8/06 1 7 55 3,660 "27 13 10 0
1st Qtr 2/28/07 1 3 54 3,600 <i 0 1 6 101
2nd Qtr 6/27/07 1 6 53 3,800 <1 0 <1 0 10 6
3rd Qtr 8/15/07 l"7 53 <io <i"o" 10 2
4th "Qtr 10/10/07 i"6 53 4>00 <i"o 12 9 8
istQtr3/2"8/d8 <1 0 63 340 "<ro <i o" ._, 2nd Qtr 6/25/08 <1 0 46 640 <1 0 <1 0 73
3rd Qtr 9/10/08' <1 o' 42 900 <1 0 <1 0 7 9
4th Qtr 10/15/08 NA 47 _NA NA NA" 95
4th Qtr 11/18/09 <2 0 NA_ i.o"o"d <2 0 <20 NA
ist"Qtr3/11/09 " <i 0 " ""49 i.ood <1 0 <1 0 ' "" "" 7 3
2nd Qtr 6/23/09 <1 0 44 •98d <1 0 <1 0 68
3rd Qtr 9/14/09 <1 0 49 I.ood <1 0 <1 0 70
4th Qtr 12/29/09 <1 0 4"6 860 <1 o" <"l 0 6 6
1st Qtr 3/3/10 <1 0 "42 "820 "<i d <i"o 68
2nd Qtr 6/14/10 <1 0 40 820 <i'o <1 0 6 9
3rd Qtr 8/12/10 <1 0 43 800 <1 0 <1 0 6 7
4th Qtr 10/15/10 <1 0 49 720 <1 0 " <i o" 64
ist Qtr 2/23/1 i"" <"i d" ""46' 1.000 <1 0 <1 0 "65
2nd Qtr 6/1/11 <1 0 49 930 <1 0 <1 0 7 3
3rd Qtr 8/17/11 <1 0 48 820 <1 0 <1 0 7 1
4th Qtr 11/16/11 <1 0 46 1500 <1 0 <1 0 7 1
istQtrl"/24/12 " <f 0 " " ""43 610 <'io <1 0 ~6~8
2nd Qtr 6/13/12 <1 0 52 660 <1 0 <1 0 67
3rd Qtr 9/13/12 <1 0 49 740 <10 " <1 0 3 0
4th Qtr 10/3/12 <1 0 50 730 <1 0 <1 0 ' 7 0
NA = not analyzed
NS = not sampled
Shaded indicates concentrations exceeding GWQS
Bold and red = highest concentration since montionng started
Bold and blue = lowest concentration since montionng started
Bold and italics indicates the MDL exceeded the GWQS
1st Qtr = January - March
2nd Qtr = Apnl - June
3rd Qtr = July - September
4th Qtr = October - December
TABLE 1
Histonc Summary Of Monitoring Parameters Up To The 4th Quarter 2012
Chloroform Contamination Investigation
DUSAWhite Mesa Mill
Well Parameter
Sampling Event GWQS
Carbon Tetrachlonde Chlonde Chloroform Chloromethane Methylene Chloride Nitrate, Nitrate + Nitnte
(5 pg/L)
(mg/L)
No GWQS (70 pg/L) (30 pg/L) (5 pg/L) (10 mg/L)
TW4-12
1st Qtr 3/16/05 NA NA <1 0 NA NA 1 4
2nd Qtr 5/25/05 NA NA" <1 0 UA NA " 1 6
3rd Qtr 8/31/06 <1 0 NA <1 0 58 <1 0 1 5
4th Qtr 12/7/05 <i o' 19 <1 0 1 0 <1 0 1 4
ist"QF3/'9/06 <i o" " 19 <i"o""~ 26 <1 0 " " 1 3
2nd Qtr 6/14/06 <1 0 16 <1 0 1 4 <1 0" " 1 4
3rd Qtr 7/20/06 <1 0 16 <1 0 "l 4 <1 o" " 1 4
4th Qtr 11/8/06 <1 0 16 <1 0 <1 0 <1 0 1 4
1st Qtr 2/28/07'" '<Td " "16 <1 0 <1 0 <1 0 1 5
2nd Qtr 6/27/07 <1 0 18 <1 0 <1 0 <1 0 1 5
3rd Qtr 8/15/07 <1 0 29 <1 0 "" <10 • " <1 o"' 1 4
4th "Qtr 10/10/07 <1 0 16 <1 0 <1 0 ' <1 0 1 4
1st Qtr 3/28/08 <1 0 16' <1 o" <"ro""" <1 0 1 6
2nd Qtr 6/25/08 <1 0 19 <1 0 <1 0 <1 0 2 7
3rd Qtr 9/10/08 <1 0 18 <1 0 <1 0 "<1 0 2 7
4th Qtr 10/15/08 <1 0 22 <1 0 <1 0 <1 o" 25
1st Qtr 3/11/09 <1 0 "23" <1 0 <1 0 <1 0 '2"4
2nd Qtr 6/23/09 <1 0 22 <1 0 <1 0 <1 0 38
3rd Qtr 9/14/09 <1 0 22 <1 0 <1 0 <1 0 51
4th Qtr 12/16/09 <1 0 23 <1 0 <1 0 <1 0 3 6
ist Qtr 2/23/1 d'" <1 0 22 <1 0 <"i o" " <i d " "• 4 0
2nd Qtr 6/14/10 <1 0 29 <1 0 <1 0 <1 0 """ 110
3rd Qtr 8/10/10 <1 0 35 <1 0 <1 0 <1 0 9d
4th Qtr 10/15/10 <1 0 31 <1 0 <1 0 <1 0 8 0
1st Qtr 2/15/11 <1 0 31 <i"o " <i d <1 0 "a's
2nd Qtr 5/25/11 <1 0 32 <i o" <1 0 <1 0 7 0
3rd Qtr 8/16/11 <1 0 31 <1 0 <1 0 <1 0 68
4th Qtr 11/15/11 <1 0 30 <1 0 <1 0 <1 0 8 0
1st Qtr 1/17/12 <1 0 "28 <1 0 <1 0 <i o" 77
2nd Qtr 5/31/12 <1 0 34 <1 0 <1 0 <io 10 0
3rd Qtr 8/29/12 <1 0 39 <1 0 <1 0 ' <1 0 130
4th Qtr 10/3/12 <1 0 39 <1 0 <1 0 <1 0 13 0
TW4-13
1st Qtr 3/16/05 NA NA <1 o" NA ' NA" - 4 2
2nd Qtr 5/25/05 NA NA <1 0 NA NA 43
3rd Qtr 8/31/05 <1 0 NA <1 0 31 <1 0 46
4th Qtr 12/7/05 <1 0 69 <1 0 <1 0 <1 0 '43
istQtr3/9/0'6 67 <1 0 1 7 <1 0 42
2nd Qtr 6/14/06 <1 0 66 "<"l 0 1 4 <1 0 49
3rd Qtr 7/20/06' <1 0 " 65 <1 0 <1 0 <1 0 43
4th Qtr 11/8/06 <1 0 33 <1 0 <1 0 <:1 0 08
1st Qtr 2/28/07 <1 0 ~59 <1 0 <1 0 <1 0 40
2nd Qtr 6/27/07 <1 0 59 <1 0 <1 0 <i d 4 6
3rd Qtr 8/15/07 <i 0 58 <1 0 <1 0~ <1 0 44
4th Qtr 10/10/07 <1 0 58 <1 0 <1 0 <1 0 41
Tst "Qtr 3/28/08"" <1 0 54 <i"o" "<i 0 <1 0 38
2nd Qtr 6/25/08 <1 0 "58 <1 0 <1 o" <i 0 4" 2
3rd Qtr 9/10/08 <1 0 ' 50 <i"o <1 o" <1 0 " 43
4th Qtr 10/15/08 <1 0 58 <1 0 <1 0 <^ 0 4 6
Ist'Qtr 3/4/09 <i'o 58 <id <1 o" <i d 3~7
2nd Qtr 6/23/09 <1 0 57 <1 0 <1 0 <1 0 i 2
3rd Qtr 9/14/09 <1 0 63 <1 0 <1 0 <1 0 47
4th Qtr 12/16/09 <1 0 60 <1 0 <1 0 <1 0 ' 4 1
1st"Qtr'2/24/10" <1 0 53 <1 0 <ro <i"o 43
2nd Qtr 6/14/10 <1 0 53 <1 0 <1 0 <1 0 52
3rd Qtr 8/10/10 <1 0 55 <1 0 " <1 0 <i o" 56
4th Qir 10/15/10 <1 0 55 <1 0 <1 0 <1 0 58
1st Qtr 2/15/11 <1 0 6"0 <1 0 <1 0 <1 0 """55
2nd Qtr 5/25/11 <1 0 56 <1 0 <1 0 <1 0 64
3rd Qtr 8/16/11 <1 0 60 <1 0 <1 0 <1 0 5 2
4th Qtr 11/15/11 <i o' 54 <1 0 "<1 0 <1 0 59
ist Qtr 1/17/12" '<i "d 55 <1 0 ' <1 0 <i 6
2nd Qtr 5/31/12 <1 0 59 <1 0 <1 0 <1 0 60
3rd Qtr 8/29/12 <1 0 60 <1 0 <1 0 <1 0 6 2
4th Qtr 10/3/12 <1 0 60 <i d" <io"" "<i d 5 9
NA = not analyzed
NS = not sampled
Shaded indicates concentrations exceeding GWQS
Bold and italics indicates the MDL exceeded the GWQS
1st Qtr = January - March
2nd Qtr = Apnl - June
3rd Qtr = July - September
4th Qtr = October - December
TABLE 1
Histonc Summary Of Monitonng Parameters Up To The 4th Quarter 2012
Chloroform Contamination Investigation
DUSAWhite Mesa Mill
Well Parameter
Sampling Event GWQS
Carbon Tetrachlonde Chloride Chloroform Chloromethane Methylene Chloride Nitrate, Nitrate + Nitrite
(5 pg/L)
(mg/L)
No GWQS (70 pg/L) (30 pg/L) (5 pg/L) (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"3/9/0"6" 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 37 NS <1 0 <1 0 24
1st Qtr 2/28/07 <rd " 38 <fd ~ <1 0 "<i "o 2nd Qtr 6/27/07 <1 0 38 <1 0 <i"o <1 0 1 4
3rd Qtr 8/15/07 <1 0 36 <1 0 <1 0 <1 0 1 1
4th Qtr 10/10/07 <1 0 38 <1 0 <1 0 <1 0 08
ist"Qfr"3/28/08~ <i d"" " 57 <1 0 <1 0 <1 0 0"4
2nd Qtr 6/25/08 <1 0 35 <1 0 <1 0 <1 0 1 6
3rd Qtr 9/10/08 <1 0 "34 <10 <i d <i d i 38
4th Qtr 10/15/08 <1 0 40 <1 0 <1 0 <1 0 0 76
ist Qtr 3/4/09 <i o~" 35 <1 0~ <ro"" <1 0 " "ie
2nd Qtr 6/23/09 <i o' 36 <1 0 <1 0 <i d 14
3rd Qtr 9/14/09 <1 0 38 <1 0 <1 0 <1 0 15
4th Qtr 12/16/09 <i o" 34 <ro <1 o" <1 0 14
Tst Q"tr 3/3/10 <1 0 33 <"l 0 <1 0 <1 0 25
2nd Qtr 6/14/10 <1 0 49 <1 0 <1 0 <1 0 2 9
3rd Qtr 8/10/10 <1 0 35 <1 0 <1 0 <1 0 2 8
4th Qtr 10/15/10 <1 0 29 <1 0 <1 0 <1 0 2 9
1st Qtr 2/15/11 <1 0 25 <1 ()""" <i d <1 0 1 8
2nd Qtr 6/14/11 <1 0 24 <1 0 <1 0 <1 0 1 4
3rd Qtr 8/16/11 <1 0 33 <1 0 <1 0 <1 0 2 6
4th Qtr 11/15/11 .<10 _.. 15 <1 0 <1 0 " <i 0 " 1 7
ist "Qtr 1/17/12"" <1 0 20 <1 0 "<To <i o" 1 9
2nd Qtr 6/14/11 <1 0 35 <1 0 <1 0 <1 0 33
3rd Qtr 8/29/12 <1 0 37 <1 0 <1 0 <1 0 39
4th Qtr 10/3/12 <1 0 " 37 <1 0 <1 0 "<1 0 39
TW4-16
1st Qtr 3/16/05 NA NA 240 NA NA <01
2nd Qtr 5/25/05 NA" NA 212 NA NA _ <0 1
3rd Qtr 8/31/05 <1 0 NA 85 3 2 43 <01
4th Qtr 12/7/05 <1 0 64 14 26 59 T4
1st cSr 3/9/06 •<i 0 60 39 11 21 """ " " 3
2nd Qtr 6/14/06 <1 0 55 13 2 4 89 1 9
3rd Qtr 7/20/06 <1 0 60 52 <1 0 "2"7 2 7
4th Qtr 11/8/06 <1 0 62 136 <1 0 9"2 56
1st Qtr 2/28/07 <1 0 79 87 <1 0 66 12 3
2nd Qtr 6/27/07 <1 0 75 26 <1 0 18 „..
3rd Qtr 8/15/07 <1 0 65 7 1 <1 0 •51 5 4
4th Qtr 10/10/07 <1 0 ' 69 1 4 <To "i 4 4
1sf"Qtr"3/28/08~ <1 0 ""52 "il "<i"o ~" „..2.6 <01
2nd Qtr 6/25/08 <1 0 58 <i d <1 0" <i d 15
3rd Qtr 9/10/08 <1 0 71 10 <1 0 14 10 5
4th Qtr 10/15/08 <1 0 89 39 <1 0 66 "9 8
istQtr3/4/d9 "" '<i o" " 73 <1 0 <1 0 <1 0 96
2nd Qtr 6/23/09 <1 0 "76 <i"o <i o" <"l 0 8 9
3rd Qtr 9/14/09' <1 0 79 <1 0 <1 0 <1 0 88
4th Qtr 12/17/09 <1 0 76 <1 0 <1 0 <1 0 5 2
ist Qtr 2/24/10"" <1 0 77 <"T'd "" "<"ro"" <To 42
2nd Qtr 6/14/10 <i 0 64 2 1 <i o" <"l 0 " 4 7
3rd Qtr 8/24/10 <1 0 72 43 <1 0 <1 0 46
4th Qtr 10/15/10 <1 0 71 3 <1 0 <1 0 3 3
1stQF2?227li ~ '^"i o" 86 15 <1 0 <"ro "7
2nd Qtr 5/26/11 <1 0 81 16 <1 0 <i o" 5
3rd Qtr 8/17/11 <1 0 63 92 <1 0 <1 0 1 7
4th Qtr 11/16/11 38 04
"'12/7/11 <1 0 <1 0 <1 0 1 4
ist~Qtr1/18/T2 •<ro" 48 <1 0 <1 0 1 7 d"i
2nd Qtr 5/26/11 <1 0 53 <1 0 <1 0 <1 0 <0 1
3rd Qtr 8/30/12 <1 0 59 <1 0 <1 0 <1 0 <0 1
4th Qtr 10/3/12' <1 0 59 <1 0 <1 0 <1 0 ' <0 1
(1) VOCs were resampled because laboratory missed holding 1
NA = not analyzed
NS = not sampled
Bold and red = highest concentration since montionng started
Bold and blue = lowest concentration since montionng started
Shaded indicates concentrations exceeding GWQS
Bold and Italics indicates the MDL exceeded the GWQS
1 st Qtr = January - March
2nd Qtr = Apnl - June
3rd Qtr = July - September
4th Qtr = October - December
TABLE 1
Histonc Summary Of Monitonng Parameters Up To The 4th Quarter 2012
Chloroform Contamination Investigation
OUSAWhite Mesa Mill
Parameter
GWQS
Carbon Tetrachlonde Chloride Chloroform Chloromettiane Methylene Chloride Nitrate, Nitrate + Nitrite
(mg/L)
(5 pg/L) No GWQS (70 pg/L) . (30 pg/L) (5 pg/L) (10 mg/L)
NA NA 38 NA NA "i4"T
NA NA" " • 29 8 NA NA " 12'9
<1 0 NA 39 2 8 <1 0 T3 3
<1 0 41 14 1 1 <1 0 "73
<1 0 36 12 Te <1 0 59
<1 0 35 12 2 7 <1 0 47
<1 0 '35 108 <1 0 <1 0' 61
<1 0 34 ' 12 5 <1 0 <1 0 57
<1 0 30 92 <1 0 <io ","~ 5"l
<1 0 28 8 <1 0 <1 0 ' 49
<1 0 "32 89 <1 0 <1 0" 50
<1 0 27 74 <1 0 <1 0 44
<1 0 " 23 64 <1 0 <1"0 0 7
<1 0 23 57 <1 0 <1 0 46
<1 0 26 8 <1 0 <i d " 4 9
<1 0 "30 94 <1 0 <1 0 5 2
<1 0 ""29 , " TT <"To <1 0 52
<1 0 30 16 <1 0 <1 0 62
<1 0 26 13 <1 0 <1 0 59
<1 0 30 82 <1 0" <1 0 "54
•<i"o " 41 69 <1 0 <1 0 "5 i <1 o' 35 29 <1 0 <1 0 90
<1 0 37 29 <1 0 <1 0 9 0
<1 0 50 30 <1 0 <1 0 10 0
"<To ~52 39 <1 0 <1 0 id"d <1 0 36 26 <1 0 <1 0 90
<1 0 23 29 <1 0 <1 0 46
23 6 3
<1 0 28 <1 0 <10"
<1 0 • "Ta 25 <1 0 <1 0 44
<10 " " 30 24 <1 0 <1 0 66
<1 0 26 38 <1 0 <1 0 '6 6
<1 0 27 30 <1 0 " <1 0 6 0
NA NA 2.200 NA NA 53
NA NA 1,200 NA NA " 5 7
<5 0 NA 1,400 <5 0' <5 0 46
<50 81 2,800 <50 <50 <01
<50 86 1,200 "<50 <50 4
<S0 116 1,100 <50 <S0 5 2
<50 123 "1,120 <50 <50 4 3
1 6 134 1,050 2 6 <1 0 46
1 3 133 <"l 0 " <rd 4
Did not sample
1 9 129 1,100 <1 0 <i 0 4 1
1 9 132 1,100 <1 0 <i 0 4
2"9 131 1.800 <1 0 <ro 22
<1 0 128 1,000 <1 0 <i 0 28
86 113 ' 3.600 <10" <i 0 352
12 124 " 4ioo <10 " <i d ' 47 8
1 2 1~27 1,100 <ro <i 0 "^ 32
1 2 132 990 <1 0 <i 0 24
15 " • 43 <1 0 <i 0 <0 1
16 124 4,700 <10" <i 0 26 7
1 3 ' 144 940 <io""" <i 0 2
4 2 132 1,800 <1 0 <i 0 44
49" 142 2,000 <1 0 <i 0 59
1 3 146 1,200 <1 0 <i 0 2 7
""i3"5 3,400 <1 0 <To" 17 0
83 148 4,000 <1 0 <1 0 12 0
"2"l 148 970 <1 0 <i 0 30
148 50
5 4""" 2^o"d <1 0 <i 0'
1 5 138 650 <10" <"To "•" "O6
1 1 149 460 <1 0 <i 0 24
35 149 950 <"l 0 <i 0 2 5
4 150 1500 <i"o " <i 0 4 1
Well
Sampling Event
TW4-18
1st Qtr 3/16/05
2nd Qtr 5/25/05
3rd Qtr 8/31/05
4th Qtr 12/7/05
Ist'Qtr 3/9/d"6
2nd Qtr 6/14/06
3rd Qtr 7/20/06
4thQtr11/8/06_
TsToir 2/28/07
2nd Qtr 6/27/07
3rdQtr8/T5/07
4th Qtr 10/10/07
1st Qtr 3/28/08
2nd Qtr 6/25/08
3rd Qtr 9/10/08
4th Qtr 10/15/08
Tst Qtr 3/4/09"
2nd Qtr 6/23/09
3rd Qtr 9/14/09
4th Qtr 12/22/09
1st Qtr 2/24/10
2nd Qtr 6/14/10
3rd Qtr 8/12/10
4th Qtr 10/15/10
1st~Qtr2/22/Tl "
2nd Qtr 5/26/11
3rd Qtr 8/17/11
4th Qtr 11/16/11
_!!Ll 2/7/1
TstQfr1/T8/12"
2nd Qtr 6/13/12
3rd Qtr 9/11/12
4th Qtr 10/3/12
TW4-19
1st Qtr 3/16/05
2nd Qtr 5/25/05
3rd Qtr 8/31/05
4th Qtr 12/7/05"
Tst Qtr 3/9/06 "
2nd Qtr 6/14/06
3rd Qtr 7/20/06
4th Ctrl 1/8/06
TstQtir2/28/07~"'
2nd Qtr 6/27/07
3rd Qtr 8/15/07
4th Qtr 10/10/07
1st Qtr 3/28/08
2nd Qtr 6/25/08
3rd Qtr 9/10/08
4th QtrJ^O/15/08
ist Qir 3/4/09
2nd Qtr 6/23/09
3rd Qtr 9/14/09
4th Qtr 12/22/09
1st Qtr 2/17/10
2nd Qtr 6/14/10
3rd Qtr 8/16/10
4th Qtr 10/15/10
1st"Qtr 2/17/11
2nd Qtr 6/7/11
3rd Qtr 8/17/11
4th Qtr 11/17/11
"'12/5/11
istQtr"l/23/i2 '
2nd Qtr 6/6/12
3nJ Qtr 9/4/12
4th Qtr 10/3/12
(1) VOCs were resampled because laboratory missed holding t
NA = not analyzed
NS = not sampled
Bold and red = highest concentration since montionng started
Bold and blue = lowest concentration since montionng started
Shaded indicates concentrations exceeding GWQS
Bold and italics indicates the MDL exceeded the GWQS
1st Qtr = January - March
2nd Qtr = Apnl - June
3rd Qtr = July - September
4th Qtr = October - December
TABLE 1
Historic Summary Of Monitoring Parameters Up To The 4th Quarter 2012
Chloroform Contamination Investigation
DUSAWhite Mesa Mill
Well Parameter
Sampling Event GWQS
CartMn Tetrachloride Chloride Chloroform Chloromettiane Methylene Chloride Nitrate, Nitrate * Nitrite
(5 pg/L)
(mg/L)
No GWQS (70 pg/L) (30 pg/L) (5 pg/L) (10 mg/L)
TW4-20
1st Qtr 3/16/05 Monitor well was not installed
2nd Qtr 5/25/05 NA NA 39,000 NA NA T6"i
3rd Qtr 8/31/05 <10 NA 3,800 <10 <10 2 9
4th Qtr 12/7/05 <25b 131 19,000 "<250 <25d 1 8
1st Qtr 3/9/06 <500 12"d 9,200 <500 <500' " 3 8"
2nd Qtr 6/14/06 <500 235 <500 <500 94
3rd Qtr 7/20/06 <1000 134 5.300 <1000 <1000 2 9
4th Qtr 11/8/06 '"7 1 124 11.000 1 9 ' "2"2 3 5
ist Qtr 2/28/07 ""3"i 124 4.'400 <1 0 1 1 42
2nd Qtr 6/27/07 2 2 112 1,800 <1 0 <1 0 23
3rd Qtr 8/15/07 35 117 5,200 <1 0 1 8 21
4th Qtr 10/10/07 6 8 170 9,000 <1 0 1 9 56
1st Qtr 3/28/08 9 132 13.000 <1 0 1 5 09
2nd Qtr 6/25/08 13 191 30.000 <1 0 1 2 8 0
3rd Qtr 9/10/08 15 156 21j,000 <1 0 "37 4" 4
4th Qtr 10/15/08 NA 168 NA
21j,000
NA NA 55
1st Qtr 3/4/09 57 164 8.200 <1 0 52 51
2nd Qtr 6/23/09" "4 9 164 6.800 <1 0 " "4 2 29
3rd Qtr 9/14/09 8 4" 153 13.000 <1 0 44 33
4th Qtr 12/14/09 14 187 15,000 "<1 0 30 ' • ' 53
1st Qtr 2/17/10 27 179 3,500 "<i"o " 32 20
2nd Qtr 6/14/10 . _ ^.^ 200 18,000 <1 0 37 56
3rd Qtr 8/16/10 12 196 15,000 <1 0 2 2 53
4th Qtr 10/15/10 20 203 24.000 <1 0 5 5 46
1st Qtr 2/23/11 27 220 31.000 <1 0 19 0 44
2nd Qtr 6/1/10 10 177 8.100 <1 0 " " '21 48
3rd Qtr 8/17/11 73 207 3,800 <1 0 31 65
4th Qtr 11/16/11 72 " 186 7,900 •ci 0 25 4 2
1st Qtr 1/23/12 10 2"0"7 11,000 <1 0 1 3 79
2nd Qtr 6/6/12 33 262 36,000 <1 0 <i 0 •" 11 d
3rd'Qtr 9/4/12 26 289 13.000 <1 0 <1 0 10 8
4th Qtr 10/3/12 22 302 19.000 <1 0 <1 0 11 0
TW4.21
1st Qtr 3/16/05 Monitor well was not Installed
2nd Qtr 5/25/05 NA NA 192 NA NA 14 6
3rdQtr8A31/05 <5 0 NA .'o <50 <5 0 101
4th Qtr 12/7/05 <1 0 353 86 <1 0 <1 0 9 6
1st Qtr 3/9/06 <25 ""347 120 <25 <25 85
2nd Qtr 6/14/06 <25 318 120 <25 <2 5 "Td2
3rd Qtr 7/20/015 <25 357 108 <2 5 <2 5 8 9
4th Qtr 11/8/06 2 296 139 <1 0 <1 0 87
1st Qtr 2/28/07 1 8 306 160 <1 0 <ro" 87
2nd Qtr 6/27/07 58 327 300 <1 0 <1 d "' 86
3ixl Qtr 8/15/07 <"id 300 140 <1 0 <1 0 86
4th Qtr 10/10/07 <1 0 288 120 <1 0 <1 0 83
1st Qtr 3/28/08 7 331 390 <1 0 <1 0 14 3
2nd Qtr 6/25/08 1 7 271 180 <1 o" <io 88
3rd Qtr 9/10/08 1 6 244 120 <1 0 <1 0 7 57
4th Qtr 10/15/08 NA 284 NA_ NA NA 8 0
4th Qtr 11/18/09 2 NA <2 0 <20 NA
1st Qtr 3/11/09" <1 0 """279 180 <i d" <"io 83
2nd Qtr 6/23/09 <1 0 291 200 <"l 0 <io" 81
3nJ Qtr 9/14/09 <1 0 281 200 <1 0 <1 0 92
4th Qtr 12/22/09 <1 0 256 160 <1 0 <1 0 84
1st Qtr 2/25/10 <1 0 228 170 <1 0 <1 0 84
2nd Qtr 614/10 <1 0 266 210 <1 0 <1 0 " "12 0
3rd Qtr 8/13/10 92 278 390 <1 0 <1 0 14 0
4th Qtr 10/15/10 - ^2 210 200 <1 0 <1 0 70
1st Qtr 2/22/11 1 2 303 230 <1 0 <1 0 90
2nd Qtr 6/28/11 48 290 290 <1 0 <1 0 12 d
3rd Qtr 8/17/11 JB3 287 "<1 0 " <i o" 14 0
4th Qtr 11/16/11 287 ...„..„13„P "'12/7/11 67 390 <1 0 <1 0
1st Qtr 1/19/12 64 228 420 <1 0 <1 0 150
2nd Qtr 6/13/12 54 285 400 <1 0 <1 0 11 0
3rd Qtr 9/13/12 6 142 410 <i o' <1 0 130
4th Qtr 10/4/12 7 270 390 <1 0 <1 0 14 d
(1) VOCs were resampled because laboratory missed holding t
NA - not analyzed
NS = not sampled
Bold and red = highest concentration since montionng started
Bold and blue = lowest concentration since montionng started
Shaded indicates concentrations exceeding GWQS
Bold and italics indicates the MDL exceeded the GWQS
1st Qtr = January - March
2nd Qtr = Apnl - June
3rd Qtr = July - September
4th Qtr = October - December
TABLE 1
Histonc Summary Of Monitoring Parameters Up To The 4th Quarter 2012
Chloroform Contamination Investigation
DUSAWhite Mesa Mill
Well Parameter
Sampling Event GWQS
Carbon Tetrachloride Chloride Chloroform Chloromethane Methylene Chloride Nitrate, Nitrate + Nitrite
(5 pg/L)
(mg/L)
No GWQS (70 pg/L) (30 pg/L) (5 pg/L) (10 mg/L)
TW4-22
1st Qtr 3/16/05 Monitor well was not installed
2nd Qtr 5/25/05 NA NA 340 NA NA ""•i"8"2 3rd Qtr 8/31/05 <5 0 NA 290 <5 0 <5 0 15 7
4th Qtr 12/7/05 <5 0 253 320 <5 0 " <50 151
1st Qtr 3/9/06 <Vo "236 390 <10 <10 15 3
2nd Qtr 6/14/06 <10 221 280 <10 <10 14 3
3rd Qtr 7/20/06 <10 221 864 <10 <10 14 5
4th Qtr 11/8/06 <1 0 236 350 1 6 <i d 159
1st Qtr 2/28/07 <i"o 347 440 <1 0 <To 20 9
2nd Qtr 6/27/07 <1 0 273 74d <1 0 <i 0 193
3rd Qtr 8/15/07 <1 0 259 530 <1 0 <i 0 19 3
4th Qtr 10/10/07 <1 0 238 440 <1 0 <i 0 188
istQtr3/2"8/0'8 " <1 0 ~5'l9 1,400 <1 0~" <i 0"" 391
2nd Qtr 6/25/08 <1 0 271 i.20d <1 0 <i 0 41 9
3rd Qtr 9/10/08 1 3 524 <1 0 <"i 0 38 7
4th Qtr 10/15/08 NA 539 NA" NA NA •• ^36 3
4th Qtr 11/18/09 <20 NA _ ""630 <2 0 <2 0 NA
1st Q"tr"3/11/09"" <i"o 17"7 390 <1 0 <1 0 20 7
2nd Qtr 6/23/09 <1 0 177 7"3d <1 0 <1 0 "20 6
3rd Qtr 9/14/09 <1 0 391 2,300 <1 0 <1 0 40 3
4th Qtr 12/29/09 <1 0 175 380 <1 0 <1 0 17"8
1st Qtr 3/3/10 <1 o" 427 2.200 <1 0 <To" 3"6 8
2nd Qtr 6/14/10 <i d 134 540 <1 0 <1 0 19 d
3rd Qtr 8/24/10 <1 0 130 340 <1 0 <1 0 "150
4th Qtr 10/15/10 <1 0 134 340 <1 0 <1 0 16 d
istQfr2/22/Ti 1 2 114 1,300 <ro <ro i8""d
2nd Qtr 6/1/11 <1 0 138 " 210 <1 0 <1 0 "170
3id Qtr 8/17/11 <1 0 120 "45d <1 0 <1 0 ""' "i'5'd
4"thQtr11/16/11 174 19 0
"'12/7/11 <1 0 400 <1 0 <io
1st Qtr 1/19/12 <1 0 36 200 <1 0""" <1 0 140
2nd Qtr 6/13/12 <1 0 35 ''' <1 0 <1 0 " 12 8
3rd Qtr 9/12/12 <1 0 121 <10 " <1 0 7 0
4th Qtr 10/4/12 <1 0 130 330 <"l 0 <i d 140
TW4-23
2nd Qtr 6/27/07 <1 0 47 <1 0 <1 0 <1 0 <0 1
3rd Qtr 8/15/07 <1 0 46 <1 0 <1 0 <1 0 <0 1
4th Qtr 10/10/07 <1 0 43 <10" <i"o " <"i"o" <01
IstQ'tr 3/28/08" <1 0 41 <1 0 <1 0 <i 0 " " " ~ <di " 2nd Qtr 6/25/08 <1 0 41 <1 0 <1 0 <1 0 <01
3rd Qtr 9/10/08 <1 0 35 <1 0 <1 0 <1 0 <0 05
4th Qtr 10/15/08 NA 51 NA "NA" NA <0 05'
4th Qtr 11/18/09 <2 0 NA _ <2 0 <2 0 " <2 0 " NA
ist Qtr 3/4/09"" <1 0 "41 <ro'" <r6 <1 0 <01
2nd Qtr 6/23/09 <1 0 43 <1 0 <1 0 <1 0 <0 1
3rd Qtr 9/14/09 <1 0 43 <1 0 <1 0 <io <0 1
4th Qtr 12/16/09 <1 0 37 <1 0 <1 0 <i 0 <0 1
1st Qtr 2/24/10 <1 0 "4~5 <io" <1 0 <oT
2nd Qtr 6/14/10 <1 0 40 <1 0 <1 0 <1 0 <01
3rd Qtr 8/24/10 <1 0 40 <1 0 <1 0 <1 0 <01
4th Qtr 10/15/10 <1 0 34 <1 0 <1 0 <1 0 <01
1st Qtr 2/16/11 '<i6"" "44' <1 0 ' <1 0 <1 0 <oT
2nd Qtr 6/14/11 <1 0 44 <1 0 <1 0 <1 0 <0 1
3rd Qtr 8/16/11 <1 0 41 <1 0 <1 0 <1 0 <0 1
4th Qtr 11/15/11 <1 0 43 <1 0 <1 0 <1 0 <01
Tst Qtr 1/17/12" <1 0 40 <1 0 <1 0 <1 0 <01
2nd Qtr 5/31/12 <1 0 44 <1 0 <1 0 <1 0 <01
3rd Qtr 8/29/12 <1 0 46 <1 0 <1 0 <1 0 <01
4th Qtr 10/3/12 <1 0 45 <1 0 <1 0 <1 0 <01
(1) VOCs were resampled because laboratory missed holding I
NA = not analyzed
NS = not sampled
Bold and red = highest concentration since montionng started
Bold and blue = lowest concentration since montionng started
Shaded indicates concentrations exceeding GWQS
Bold and italics indicates the MDL exceeded the GWQS
1st Qtr = January - March
2nd Qtr = Apnl - June
3rd Qtr = July - September
4th Qtr = October - December
TABLE 1
Historic Summary Of Monitoring Parameters Up To The 4th Quarter 2012
Chloroform Contamination Investigation
DUSAWhite Mesa Mill
Well Parameter
Sampling Event GWQS
Cartjon Tetrachlonde Chloride Chloroform Chloromethane Methylene Chlonde Nitrate, Nitrate * Nitnte
(5 pg/L)
(mg/L)
No GWQS (70 pg/L) (30 pg/L) (5 pg/L) (10 mg/L)
TW4-24
2nd Qtr 6/27/07" <1 0 770 26 <1 0 <1 0 """" " •26 i
3rti Qtr 8/15/07 <1 0 791 22 <1 0 <1 0 ^ 29
4th Qtr 10/10/07 <1 0 692 1 5 <ro <1 0 24 7
1st Qtr 3/28/08 <1 0 ""7"4d 1 5 <i 0 <1 0 24 4
2nd Qtr 6/25/08 <1 0 834 1 4 <i 0 <1 0 45 3
3rd Qtr 9/10/08 <1 0 1180 29 <i 0 <1 0 384
4th Qtr 10/15/08 NA 1130 NA NA NA 448
4th Qtr 11/18/09 <2 0 NA <20 <2 0 <2d NA' "'" TstQtr"3/4/09 <1 0 " " i"oio r4 <1 0 <1 0 305
2nd Qtr 6/23/09" <1 0 759 1 5 <1 0 <1 0 30 4
3rd Qtr 9/14/09 <1 0 618 1 4 <1 0 <1 0 307
4th Qtr 12/16/09 <1 0 1080 1 2 <1 0 <1 0 28 3
1st Qtr 2/25/10 <1 0 " "896 " 1 "3" "<1 0 " <1 0 331
2nd Qtr 6/14/10 <1 0 639 1 7 <1 0 <1 0 "30
3nJ Qtr 8/24/10 <1 0 587 1 8 <1 0 <1 0 "31
4th Qtr 10/15/10 <1 0 5"22 1 4 <1 0 " <1 0" " "31
1st Qtr 2/17/11 <1 0 Tido 1 8 <io" <To "31
2nd Qtr 5/26/11 <1 0 1110 1 1 <1 0 <1 0 35
3rd Qtr 8/17/11 <1 0 967 1 7 <1 0 <1 0 34
4th Qtr 11/16/11 606 35
"'12/7/11 <1 0 "1 2 <1 0 <1 0
ist'Otr" T/16/12" <ro""' 373 <1 0 <'10'' <1 0 37
2nd Qtr 6/6/12 <ro 355 <1 0 <1 0 " <1 0' "•" 37
3rd Qtr 8/30/12 <1 0 489 <1 0 <1 0 <1 0 ' " 37
4th Qtr 10/3/12 <1 0 405 1 <1 0 <1 0 38
TW4-25 _ 2nd Qtr 6/27/07 <1 0 395 <1 0 <1 0 <i 0
3rd Qtr 8/15/07 <1 0 382 22 <1 0 <1 0 " 29
4th Qtr 10/10/07 <1 0 358 <1 0 <1 0 <1 0 17
1st Qtr 3/28/08 "<f 0 '374 <1 0 <1 0 <1 0 " " 187
2nd Qtr 6/25/08 <1 0 344 <1 0 <1 0 <1 0 221
3rd Qtr 9/10/08 <1 0 333 <1 0 <1 0 <1 0 " 188
4th Qtr 10/15/08 NA 366 NA NA NA" 21 3
4th Qtr 11/18/09 <2'0" NA <2 0 <2 0 <2 0 NA
1st Qtr 3/4/09 <1 0 " 332 <io"" <To <1 0 153
2nd Qtr 6/23/09 <1 o' 328 <1 0 <1 0 <1 0 ,, ., is;? 3rd Qtr 9/14/09 <1 0 328 <1 0 <1 0 <1 0 33
4th Qtr 12/14/09 <1 0 371 <1 0 <i"o <1 0 """ "' 14 2"
istQtr2/23/To " '<1 0 ' " 296 <i "d""" <io' <'To" 144
2nd Qtr 6/14/10 <1 0 306 <1 0 <1 0 <1 0 16
3rd Qtr 8/10/10 <1 0 250 <1 0 <1 0 <1 0 14
4th Qtr 10/15/10 <1 0 312 <1 0 <1 0 <1 0 15
1st Qtr 2/16/11 <1 0 "315 " i""8 "<i d <1 0 15
2nd Qtr 5/25/11 <1 0 321 <1 0 <1 0 <1 0 16
3rd Qtr 8/16/11 <1 0 276 <1 0 <1 0 <10 16
4th Qtr 11/15/11 <1 0 294 <"l 0 <i"o <1 0 16
1st Qtr 1/16/12 <1 0 ""3"04 <i d " <To "<1 0 " " 16
2nd Qtr 5/31/12 <1 0 287 <1 0 <i 0 <1 0 16
3rd Qtr 9/4/12 <1 0 334 <1 0 <i 0 <1 0 17
4th Qtr 10/3/12 <1 0 338 <1 0 <i 0 <1 0 " "17
TW4.26
2nd Qtr'6/14/10 <1 0 33 13 <i 0 <1 0 79
3rd Qtr 8/24/10 <1 0 17 52 <i 0 <1 0 9
4th Qtr 10/15/10 <1 0 22 54 <i 0 <1 0 96
Isfotf 2/16/11 " '<i"d 30 2 <i 0 <10" 10
2nd Qtr 5/26/11 <1 0 15 ,2 9 <i 0 <1 0 10
3rd Qtr 8/17/11 <1 0 19 28 <i 0 <1 0 11
4th Qtr 11/16/11 26 id
"'12/7/11 <1 0 52 <i 0 <1 0"
1st Qtr 1/18/12" '<ro 17 7 <i 0 <i "o" 11
2nd Qtr 6/6/12 <1 0 ' 19 41 <i 0 <1 0 ... 3rd Qtr 9/11/12 <1 0 19 49 <i 0 <'io ' ' 9
4th Qtr 10/3/12 <1 0 19 4"9 <10 <1 0 ' " "" "12
TW4-27
24 1st Qtr 1/18/12 <1 0 11 9 <i 0 <1 0 24
2nd Qtr 6/13/12 <1 0 17 <1 0 <"i 0 <1 0 41
3rd Qtr 9/4/12 <To 21 <1 0 <i 0 <1 0 37
4th Qtr 10/3/12 <1 0 18 <1 0 <i 0 <1 0 36
TW4.60 (Duplicate Sample of ??)
4th Qtr 10/3/12 <1 0 <1 0 2 <10 <1 0 <01
TW4.65 (Duplicate Sample of 9)
4th Qtr 10/3/12 <1 0 21|<10 <i 0 <1 0 40
TW4-70 (Duplicate Sample of TW4^1)
4th Qtr 10/3/12 8 249 430|<1 0 <1 0 14 01
NA = not analyzed
NS = not sampled
Shaded indicates concentrations exceeding GWQS
Bold and italics indicates the MDL exceeded the GWQS
1st Qtr = January - March
2nd Qtr = Apnl - June
3rd Qtr = July - September
4th Qtr = October - December
Table 2
Summary of QA/QC Samples
4th Quarter 2012
Parameter GWQS Parameter GWQS Duplicate of MW-9 Duplicate of TW4-21 Parameter GWQS
MW-9 TW4-65 RPD TW4-21 TW4-70 RPD
Nitrate + Nitrite (as N) 10 mg/L 3.8 4 -5.1 14 14 0.0
Chloride none 21 21 0.0 270 249 8.1
Chloroform 70 pg/L <1.0 <1.0 nc 390 430 -9.8
Carbon tetrachloride 5 pg/L <1.0 <1.0 nc 7 8 -13.3
Chloromethane 30 pg/L <1.0 <1.0 nc <1.0 <1.0 nc
Methylene Chloride 5 pg/L <1.0 <1.0 nc <1.0 <1.0 nc
nc = not calculated
label 3
Chloroform Mass Removal Calculations
DUSAWhite Mesa Mill, Bland, Utah
4th Quarter 2012
DRC Mass Removal Calculations
Well ID MW4 MW-26 TW4-4 TW4-19 TW4-20
Ave. Chloroform (ug/L) 1.300 1.200 1.400 1,500 19.000
Chloroform (g/L) 1.30E-03 1.20E-03 1.40E-03 1.50E-03 1.90E-02
Chloroform (Ibs/L) 2.87E-06 2.65E-06 3.09E-06 3.31 E-06 4.20E-05
Chloroform (lbs/gal) 1.09E-05 1.00E-05 1.17E-05 1.25E-05 1.59E-04
Total gallons pumped 4th qtr 2012 78.840 30.797 66.089 156.653 20.114
lbs of chloroform removed 0.9 0.3 0.8 2.0 3.2
Gallons of chloroform removed 0.1 0.0 0.1 0.2 0.3
total lbs of chloroform removed 7.10
total qallons of chloroform removed 0.58