DRC-2012-002382 - 0901a0688032415c

State of Utah
GARYR HERBERT
Governor
GREG BELL
Lieutenant Governor
Department of
Environmental Quality
Amanda Smith
Executive Director
DIVISION OF RADIATION CONTROL
Dane L Finerfrock
Director
DRC-2012-002382
MEMORANDUM
TO
FROM
DATE
SUBJECT
Phil Goble /
Dean Henderson
'Ausust.19, 2012
Review of the 2^^ Quarter 2012 Chloroform Momtonng Report for the Chloroform
Contamination Investigation, Energy Fuels Resources (USA) Inc ("EFR") White
Mesa Uranium Mill, near Blanding, Utah
The Division of Radiation Control ("DRC") has reviewed the 2"^* Quarter Chloroform Momtonng
Report ("Report") for the Chloroform Contamination Investigation For the review of this report
the following regulatory enforcement documents were used
• DUSA was issued Ground Water Quality Discharge Permit No UGW370004 ("Permit")
on March 8, 2005, last revised on August 24, 2012
• The DUSA Quality Assurance Plan ("QAP") June 7, 2012 (Revision 7.2)
REVIEW
Monitor Well Samplmg
The following momtor wells where sampled as requned m 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 (fomierly TW 4-15), MW-32 (formerly TW4-17), TW4-26
and TW4-27
The water samples for the above wells were analyzed for the following constituents as required in
the QAP
Chloroform, Chloromethane, Carbon tetrachlonde, Methylene chlonde, Chlonde and Nitrate plus
168 North 1950 West • Salt Lake City, UT
Maihng Address P O Box 144850 • Salt Lake City, UT 84114-4850
Telephone [phone] • Fax (801) 533^097 •TDD [phone]
www deq utah gov
Pnnted on 100% recycled paper
Page 2
Nitnte as Nitrogen Use of analytical methods is consistent with the requirements of the QAP
requirements
The followmg momtonng wells were purged using the three approved QAP well purging
strategies and meet QAP requirements for each strategy:
1. Purging three well casing volumes with a single measurement of field parameters
specific conductivity, turbidity, pH, redox potential, and water temperature
Wells TW 4-5 and TW 4-18
2 Purging two casing volumes with stable field parameters for specific conductivity,
turbidity, pH, redox potential, and water temperature (within 10% RPD)-
Wells TW4-1, TW4-8, TW4-9, TW4-11, TW4-12, MW-32, TW4-21, TW4-23, TW4-
24, and TW4-25
3 Purging a well to dryness and stability of field parameters for pH, specific
conductivity, and water temperature only after recovery
Wells TW4-2, TW4-3, TW4-6, TW4-7, TW4-10, TW4-13, TW4-14, TW4-22^ TW4-26,
and TW4-27
QAQC
Holding Times
The method holding times for each parameters were received and analyzed
within the required holding times m the QAP
Receipt Temperature
All samples were received within the required QAP temperature limit of 6° C
Detection Limits
All analytes were measured and reported to the required reporting limits, except 22 sets (21
samples and 1 duplicate) of sample results had the reporting limit raised for at least one analyte
due to matnx 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 MW-32 and its duplicate sample TW4-70 and TW4-
11 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)
Page 3
Groundwater Head Monitoring
Depth to groimdwater was measured in the following wells and/or piezometers, as required m Part
IE 3 ofthe Permit
• The quarterly groundwater compliance momtonng wells
• Existmg momtonng well MW-4 and all of the temporary chloroform investigation
wells
• Piezometers P-l, P-2, P-3, P-4 and P-5
•MW-20 and MW-22.
• Nitrate momtonng wells
• The DR piezometers which were installed dunng the Southwest Hydrologic
Investigation
In addition, weekly and monthly depth to groimdwater measurements were taken in MW-4, MW-
6, TW4-19, TW4-20, and TW4-4
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 m 3'*' quarter 2012 is 10 4 lbs (see Table 3 below)
Reporting
The Report included the following information as required in the QAP.
a) Introduction
b) Sampling and Momtonng Plan
-Descnption of monitor wells
-Descnption of sampling methodology, equipment and decontamination procedures
-Identify all quality assurance samples, e g tnp 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
momtor well over time, 3) depth to groimdwater measured and
groundwater elevation from each momtor well summanzed in a data table,
that includes histonc groundwater level data for each well, and 4) an
evaluation of the 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
Page 4
chloroform concentration trends in each well through time and, 3)
analytical results for each well summanzed in a data table, that includes
histonc analytical results for each well.
-Calculate chloroform mass removed by pumping wells Calculations
would include 1) total histonc chloroform mass removed, 2) total histonc
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
momtonng conducted dunng the quarter
f) Copies of DUSA field records, laboratory reports and chain of custody forms
Review Conclusions
The Report appeared to be m compliance with the Permit and QAP
Page 5
References
Denison Mines (USA) Corp , June 7, 2012 White Mesa Uranium Mill, Ground Water Momtonng
Quality Assurance Plan (Revision 7 2)
Demson Mines (USA) Corp , February 27, 2012, White Mesa Uramum Mill Chloroform
Momtonng Report 2"^* Quarter (July through September 2012)
State of Utah Division of Water Quality Department of Environmental Quality, August 24, 2012,
Ground Water Discharge Permit for Demson 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 Uramum Mill Notice of Violation and Groundwater Corrective Action Order,
Docket No UGW-20-01
TABLE 1
Historic Summary Of Monitoring Parameters Up To The 2nd Quarter 2012
Chloroform Contamination Investigation
DUSA White Mesa Mill
Well Parameter
Sampling Event GWQS
Carbon Tetrachlonde Chlonde Chloroform Chloromethane Methylene Chloride Nitrate, Nitrate + Nitrite
(mg/L)
(5 pg/L) No GWQS (70 pg/L) (30 pg/L) (5 pg/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 71
3rd Qtr 8/31/05 <10 NA 3,500 <10 <10 70
4th Qtr 12/7/05 <S0 53 3,000 <50 <S0 70
1st Qtr 3/9/06 <S0 49 3.100 <50 <50 60
2nd Qtr 6/14/06 <S0 49 3,000 <50 <S0 60
3rd Qtr 7/20/06 <so 48 2,820 <50 <50 1 2
4th Qtr 11/8/06 21 50 2,830 1 4 <1 0 64
1st Qtr 2/28/07 1 6 47 2,300 <1 0 <1 0 63
2nd Qtr 6/27/07 1 8 45 2,000 <1 0 <1 0 70
3rd Qtr 8/15/07 1 9 47 2,600 <1 0 <1 0 62
4th Qtr 10/10/07 1 7 45 2,300 <1 0 <1 0 62
1st Qtr 3/28/08 1 7 42 2,400 <1 0 <1 0 58
2nd Qtr 6/25/08 1 8 42 2,500 <1 0 <1 0 61
3rd 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
1st Qtr 3/4/09" 1 5 37 2,200 <1 0 <1 0 57
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 " 1,866 <1 0 <1 0 58
1st Qtr 2/17/10 1 2 45 1.600 <1 0 <1 0 40
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 48
4th Qtr 10/15/10 1 4 41 1.500 <1 0 <1 0 49
1st Qtr 2/23/11 1 5 40 1.700 <1 0 <1 0 46
2nd Qtr 6/1/11 1 4 35 1,700 <1 0 <1 0 49
3rd Qtr 8/17/11 1 1 41 1.700 <1 0 <1 0 49
4th Qtr 11/16/11 1 3 40 1.600 <1 0 <1 0 51
1st Qtr 1/23/12 1 41 1.500 <1 0 <1 0 48
2nd Qtr 6/6/12 1 2 39 1,400 <1 0 <1 0 49
MW-4A(TW4-A)
1st Qtr 3/16/05 NA NA '"3.766 NA NA 71
2nd Qtr 5/25/05 NA NA 3.740 NA NA 78
3rd Qtr 8/31/05 <10 NA 3.800 <10 <10 69
4th Qtr 12/7/05 <50 55 3.000 <50 <50 67
1st Qtr 3/9/06 <50 53 3,700 <50 <S0 58
2nd Qtr 6/14/06 <S0 54 3,300 <S0 <S0 73
3rd Qtr 7/20/05 <50 54 3,190 <50 <50 1 2
4th Qtr 11/8/05 24 54 3,370 <1 0 <1 0 71
1st Qtr 2/28/07 1 9 60 2,500 <1 0 <1 0 7 1
Well abandonded
MW-26 (former TW4-15)
1st Qtr 3/16/05 NA NA ""310 NA NA 03
2nd Qtr 5/25/05 NA NA 442 NA NA 02
3rd Qtr 8/31/05 <5 0 NA 960 54 <5 0 02
4th Qtr 12/7/05 <S0 55 1,000 <S0 <so 03
1st Qtr 3/9/06" <S0 52 1.100 <50 <50 02
2nd Qtr 6/14/06 <50 52 830 <S0 <50 02
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 36 1
4th Qtr 10/10/07 <1 0 57 "2.600 <1 0 14 06
"lst"Qtr 3/28/08 <1 0 49 930 <1 0 40 0 1
2nd Qtr 6/25/08 <1 0 57 1.300 <1 0 63 06
3rd Qtr 9/10/08 <1 0 44 630 <1 0 24 02
4th Qtr 10/15/08 NA 64 NA NA NA 0 1
4th Qtr 11/18/09 <2 0 NA 1.700 <2 0 • 160 NA
1st Qtr 3/4/09 <1 0 49 950 <1 0 51 04
2nd Qtr 6/23/09 <1 0 48 410 <1 0 12 02
3rd Qtr 9/14/09 <1 0 46 850 <1 0 30 0 1
4th Qtr 12/14/09 <1 0 60 1.100 <1 0 40 23
1st Qtr 2/17/10 <1 0 57 730 <1 0 19 02
2nd Qtr 6/14/10 1 2 40 1.600 <1 0 68
3rd Qtr 8/16/10 <1 0 49 2,200 <1 0 2{ 06
4th Qtr 10/15/10 <1 0 65 970 <1 0 65 07
1st Qtr 2/23/11 <1 0 57 450 <1 0 3 6 05
2nd Qtr 5/31/11 <1 0 88 1.800 <1 0 1 3 04
3rd Qtr 8/17/11 <1 0 58 720 <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 <1 0 98 2,400 <1 0 16 1 7
2nd Qtr 6/6/12 <1 0 73 3,000 <1 0 21 25
(1) VOCs were resampled because laboratory missed holding
NA - not analyzed
NS - not sampled
Shaded indicates concentrabons exceeding GWQS
Bold and red = highest concentration since montonng started
Bold and blue = lowest concentration since montonng started
Bold and italics indicates the MDL exceeded the GWQS
1st Qtr = January - March
2nd Qtr = Apnl - June
fame
TABLE 1
Historic Summary Of Monitoring Parameters Up To The 2nd Quarter 2012
Chloroform Contamination Investigation
DUSA White Mesa Mill
Well
Sampling Event
Parameter
GWQS
Well
Sampling Event
Carbon Tetrachloride
(5 pg/L)
Chloride
(mg/L)
;NO GWQS
Chloroform
(70 pg/L)
Chloromethane
(30 pg/L)
Methylene Chlonde
(5 pg/L)
Nitrate, Nitrate + Nitnte
(10 mg/L)
3rd Qfa- = July - September
4th Cttr = October - December
TABLE 1
Historic Summary Of Monitoring Parameters Up To The 2nd Quarter 2012
Chloroform Contamination Investigation
DUSA White Mesa Mill
Well
Sampling Event
Parameter
GWQS
Carbon Tetrachlonde Chloride Chloroform Chloromethane Methylene Chlonde Nitrate, Nitrate + Nitrite
(mg/L)
iSVQlL) No GWQS (70 pg/L) (30 pg/L) (5 pg/L) (10 mg/L)
MW-32 (former TW4-17)
1st Qtr 3/16/05 NA NA <1 0 NA NA <01
2nd Qfa-5/25/05 NA NA <1 0 NA NA <01
3rd Cttr 8/31/05 <1 0 NA <1 0 32 <1 0 <01
4th Qtr 12/7/05 <1 0 33 <1 0 <1 0 <1 0 <01
1st Qtr 3/9/06 <i o" 32 <1 0 <1 0 <1 0 <01
2nd Qb-6/14/06 <1 0 30 <1 0 35 <1 0 <01
3rd Qfa-7/20/06 <1 0 32 <1 0 1 8 <1 0 <1 0
4th Qfa-11/8/06 <1 0 31 <1 0 1 5 <1 0 <1
1st Qfa-2/28/07 <1 0 32 <1 0 <1 0 <1 0 <1 0
2nd Qb-6/27/07 <1 0 32 <1 0 <1 0 <1 0 <1 0
3rd Qfa-8/15/07 <1 0 31 <1 0 <1 0 <1 0 <1 0
41h Qfa-10/10/07 <1 0 32 <1 0 <1 0 <1 0 <1 0
1 St Qb-3/28/08" <1 0 " 31 <1 0 <1 0 <1 0 <1
2nd Qfa-6/25/08 <1 0 29 <1 0 <1 0 <1 0 <1 0
3rd Qfa-9/10/08 <1 0 30 <1 0 <1 0 <1 0 <1 0
4th Qb-10/15/08 <1 0 26 <1 0 <1 0 <1 0 <0 05
1st Qtr 3/4/09 <1 0 30 <1 0 <1 0" <1 0 < 1
2nd Qfa-6/23/09 <1 0 31 <1 0 <1 0 <1 0 <0 1
3rd Qfa-9/14/09 <1 0 33 <1 0 <1 0 <1 0 <0 1
4th Qfa-12/16/09 <1 0 35 <1 0 <1 0 <1 0 <01
1st Qb-2/17/10 <1 0 38 <1 0 <1 0 <1 0 <01
2nd Qb-6/14/10 <1 0 32 <1 0 <1 0 <1 0 <01
3rd Qfa-8/16/10 <1 0 28 <1 0 <1 0 <1 0 <01
4th Qb-10/15/10 <1 0 24 <1 0 <1 0 <1 0 <01
1st Qfa-2/23/11 <1 0 40 <1 0 <1 0 <1 0 <01
2nd Qb-5/25/11 <1 0 31 <1 0 <1 0 <1 0 <01
3rd Qfa-8/16/11 <1 0 33 <1 0 <1 0 <1 0 <0 1
4ttiQb-11/16/11 32 <0 1
12/7/11 <1 0 <1 0 <1 0 <1 0
1st Qfa-1/18/12 <1 0 21 <1 0 <1 0 <1 0 <01
2nd Qfa-6/22/12 <1 0 32 <1 0 <1 0 <1 0 <0 1
TW4-1
1st Qfa-3/16/05 NA NA ""2.766 NA NA 9 1
2nd Qb-5/25/05 NA NA NA NA """ ' 106
3rd Qfa-8/31/05 <10 NA 2.900 <10 <10 9 8
4tti Qfa-12/7/05 <50 52 2.400 <50 <50 97
1st Qfa-3/9/06 <50 49 2.700 <50 <S0 94
2nd Qb-6/14/06 <so 48 2.200 <50 <S0 96
3rd Qfa-7/20/06 <50 51 2.840 <50 <S0
4th Qb-11/8/06 1 4 47 2.260 <1 0 <1 0 92
1st Qfar 2/28/07 1 2 47 1.900 <1 0 <1 0 89
2nd Qb-6/27/07 1 4 45 1.900 <1 0 <1 0 9
3rd Qbr 8/15/07 1 3 43 2,300 <1 0 <1 0 84
4th Qfa-10/10/07 1 3 43 2,000 <1 0 <1 0 78
1st Qfa-3/28/08 1 3 39 2,000 <1 0 <1 0 76
2nd Qfa-6/25/08 1 1 39 1,900 <1 0 <1 0 8 68
3rd Cttr 9/10/08 1 3 35 1,700 <1 0 <1 0 815
4th Qb-10/15/08 1 3 41 1,700 <1 0 <1 0 93
1st Qfa-3/11/09 1 1 37 1,700 <1 0 <1 0 75
2nd Qfa-6/23/09 1 37 1,500 <1 0 <1 0 69
3rd Qfa-9/14/09 <1 0 36 1,700 <1 0 <1 0 73
4th Qfa-12/29/09 <1 0 41 1,400 <1 0 <1 0 68
1st Qfa-3/3/10 <1 0 35 1,300 <1 0 <1 0 7 1
2nd Qfa-6/14/10 1 2 40 1.600 <1 0 <1 0 68
3rd Qfa-8/18/10 1 35 I.6O6 <1 0 <1 0 67
4tti Qfa-10/15/10 <1 0 40 1.500 <1 0 <1 0 66
1st Qfa-2/24/11 <1 0 41 1.300 <1 0 <1 0 66
2nd Qb-6/1/II <1 0 35 1.200 <1 0 <1 0 66
3rd Qb-8/18/11 <1 0 36 1,306 <1 0 <1 0 68
4tti Qfa-11/29/11 <1 0 40 1,506 <1 0 <1 0 66
1st Qfa-1/24/12 <1 0 38 1,300 <1 0 <1 0 68
2nd Qb-6/14/12 <1 0 42
1,300
<1 0 <1 0 7 1
(1) VOCs were resampled because laboratory missed holding
NA = not analyzed
NS = not sampled
Sliaded indicates concenbabons exceeding GWQS
Bold and red = highist concentrafaon since monfaonng started
Bold and blue = lowest concenbabon since monfaonng started
Bold and italics indicates the MDL exceeded the GWQS
1st Qfa- = January - March
2nd Qb- = Apnl - June
3rd Qfa- = July - September
4th Qfa- = October - December
fame
TABLE 1
Historic Summary Of Momtonng Parameters Up To The 2nd Quarter 2012
Chloroform Contamination Investigation
DUSA White Mesa Mill
Well Parameter
Sampling Event GWQS
Carbon Tetrachloride Chlonde Chloroform Chloromethane Methylene Chloride Nitrate, Nitrate + Nitnte
(mgIL)
(Spgrt.) No GWQS (70 pg/L) (30 pg/L) (5 pg/L) (10 mg/L)
TW4-2
1st Qfa-3/16/05 NA NA 3,700 NA NA 77
2nd Qb-5/25/05 NA NA 3,750 NA NA 86
3rd Qb-8/31/05 <10 NA 3.900 <10 <10 80
4ttiQb-12/7/05 <50 56 3,500 <50 <50 78
1st Qfa-3/9/06 <S0 56 3.800 <50 <50 75
2nd Qfa-6/14/06 <S0 56 3.200 <50 <S0 7 1
3rd Qfa-7/20/06 <S0 54 4.120 <50 <50 74
4tti Qfa-11/8/06 2 3 55 3,420 <1 0 <1 0 76
1st Qfa-2/28/07 1 8 54 2,300 <1 0 <1 0 73
2nd Qfa-6/27/07 25 50 3,000 <1 0 <1 0 78
3rd Qfa-8/15/07 22 49 340 (?) <1 0 <1 0 73
4th Qfa-10/10/07 21 51 3,200 <1 0 <1 0 69
1st Qtr 3/28/08 2 3 48 3,300 <1 0 <1 0 69
2nd Qfa-6/25/08 22 46 3,100 <1 0 <1 0 74
3rd Qfa-9/10/08 24 42 2,800 <1 0 <1 0 7 1
4th Qb-10/15/08 NA 47 NA NA NA 80
4th Qb-11/18/09 24 NA 3,200 <2 0 <2 0 NA
1st Qfa-3/11/09 2 2 46 3,100 <1 0 <1 0 65
2nd Qfa-6/23/09 2 44 2,800 <1 0 <1 0 64
3rd Qb-9/14/09 2 43 3.000 <1 0 <1 0 66
4tti Qb-12/29/09 2 46 1.600 <1 0 <1 0 64
1st Qfa-3/3/10 2 42 2.600 <1 0 <! 0 68
2nd Qfa-6/14/10 26 43 3.300 <1 0 <1 0 87
3rd Qb-8/18/10 25 43 3.300 <1 0 <1 0 66
4th Qfa-10/15/10 21 41 3.000 <1 0 <1 0 65
1st Qb-2/24/11 2 4 46 3,100 <1 0 <1 0 70
2nd Qb-6/2/11 22 42 3,000 <1 0 <1 0 68
3rd Qfa-8/17/11 1 6 48 2,400 <1 0 <1 0 60
4th Qfa-11/29/11 28 49 3,900 <1 0 <1 0 70
1st Qfa-1/24/12 2 49 2.500 <1 0 <1 0 7 1
2nd Qfa-6/14/12 21 52 2.500 <1 0 <1 0 77
TW4-3
1st Qb-3/16/05 NA NA <1 0 NA NA 35
2nd Qfa-5/25/05 NA NA <1 0 NA NA 37
3rd Qfa-8/31/05 <1 0 NA <1 0 64 <1 0 35
4th Qbr 12/7/05" <1 0 26 <1 0 <1 0 <1 0 33
1st Qb-3/9/06 <1 0 26 <1 0 2 3 <1 0 33
2nd Qfa-6/14/06 <1 0 26 <1 0 1 6 <1 0 7 1
3rd Qb-7/20/06 <1 0 26 <1 0 22 <1 0 29
4th Qb-11/8/06 <1 0 23 <1 0 <1 0 <1 0 1 5
1 St Qb-2/28/07 <1 0 22 <1 0 <1 0 <1 0 31
2nd Qfa-6/27/07 <1 0 23 <1 0 <1 0 <1 0 33
3rd Qb-8/15/07 <1 0 24 <1 0 <1 0 <1 0 3 1
4th Qb-10/10/07 <1 0 27 <1 0 <1 0 <1 0 28
1st Qfa-3/28/08 <1 0 21 <1 0 <1 0 <1 0 28
2nd Qfa-6/25/08 <1 0 19 <1 0 <1 0 <1 0 29
3rd Qfa-9/10/08 <10 19 <1 0 <1 0 <1 0 27
4th Qfa-10/15/08 <1 0 22 <1 0 <1 0 <1 0 26
1st Qfa-3/4/09" <i"o 21 <1 0 <1 0 <1 0 " 25
2nd Qb- 6/23/09 <1 0 20 <1 0 <1 0 <1 0 29
3rd Qb-9/14/09 <1 0 21 <1 0 <1 0 <1 0 28
4th Qfa-12/29/09 <1 0 22 <1 0 <1 0 <1 0 26
1st Qfa-2/23/10 <1 0 23 <1 0 <1 0 <1 0 28
2nd Qb-6/14/10 <1 0 24 <1 0 <1 0 <1 0 30
3rd Qb-8/10/10 <1 0 22 <1 0 <1 0 <1 0 31
4ttiQb-10/15/10 <1 0 26 <1 0 <1 0 <1 0 33
1st Qfa-2/15/11 <1 0 23 <1 0 <1 0 <1 0 35
2nd Qfa-5/25/11 <1 0 23 <1 0 <1 0 <1 0 37
3rd Qfa-8/16/11 <1 0 23 <1 0 <1 0 <1 0 40
4tti Qfa-11/14/11 <1 0 23 <1 0 <1 0 <1 0 44
1st Qb-1/17/12 <1 0 21 <1 0 <1 0 <1 0 7 1
2nd Qfa-5/31/12 <1 0 24 <1 0 <1 0 <1 0 44
NA = not analyzed
NS = not sampled
Shaded indicates concentrabons exceeding GWQS
Bold and red = highist concentrafaon since monfaonng started
Bold and blue = lowest concentrafaon since monfaonng started
Bold and italics indicates the MDL exceeded ttie GWQS
1st Qfa- = January - March
2nd Qfa- = Apnl - June
3rd Qfa- = July - September
4th Qfa- = October - December
TABLE 1
Histonc Summary Of Monitoring Parameters Up To The 2nd Quarter 2012
Chloroform Contamination Investigation
DUSA White Mesa Mill
Parameter
GWQS
Carbon Tetrachlonde Chlonde Chloroform Chloromethane Methylene Chlonde Nitrate, Nitrate •«• Nitnte
(mg/L)
(5 pg/L) No GWQS (70 pg/L) (30 pg/L) (5 pg/L) (10 mg/L)
NA NA '"slioo NA NA 10 0
NA NA 2,400 NA NA 11 3
<10 NA <10 <10 99
<50 54 2.800 <50 <S0 "102
<so 51 2.900 <50 <50 95
<50 48 2.600 <50 <50 86
<50 50 2.850 <50 <50 97
1 7 49 2.670 <1 0 <1 0 T6 i'
1 5 49 2.200 <1 0 <1 0 90
1 7 47 2.400 <1 0 <1 0 94
1 5 45 2.700 <1 0 <1 0 95
1 5 47 2.500 <1 0 <1 0 95
1 6 43 2,800 <1 0 <1 0 92
1 5 42 2.500 <1 0 <1 0 10 8
1 4 39 2.200 <1 0 <1 0 88
NA 44 NA NA NA 10 1
<2 0 NA 2.500 <2 0 <2 0 NA
1 2 37 2,200 <1 0 <1 0 10 2
1 2 34 1,800 <1 0 <1 0 8 2
1 1 39 2,000 <1 0 <1 0 84
1 1 41 <1 0 <1 0 76
1 48 1,700 <1 0 <1 0 66
1 2 35 1,700 <1 0 <1 0 76
1 3 36 2,100 <1 0 <1 0 73
1 3 38 1J00 <1 0 <1 0 7 1
1 4 41 1,800 <1 0 <1 0 70
1 2 35 1,700 <1 0 <1 0 70
<1 0 40 1,500 <1 0 <1 0 66
1 39 1,500 <1 0 <1 0 70
<1 0 38 1.200 <1 0 <1 0 71
<1 0 43 1.500 <1 0 <1 0 71
NA NA NA NA 49
NA NA 113 NA NA 37
<2 5 NA 82 58 <2 5 60
<2 5 56 63 25 <2 5 60
<2 5 52 66 31 <2 5 60
<2 5 51 51 31 <2 5 59
<1 0 54 53 7 <1 0 <1 0 67
<1 0 55 471 <1 0 <1 0 29
<1 0 57 35 <1 0 <1 0 78
<1 0 45 26 <1 0 <1 0 70
<1 0 38 92 <1 0 <1 0 77
<1 0 39 94 <1 0 <1 0 82
<i"o 36 11 <1 0 <1 0 74
<1 0 37 93 <1 0 <1 0 87
<1 0 34 11 <1 0 <1 0 79
<1 0 37 10 <1 0 <1 0 93
<1 0 34 12 <1 0 <1 0 79
<1 0 37 13 <1 0 <1 0 75
<1 0 48 12 <1 0 <1 0 83
<1 0 41 85 <1 0 <1 0 75
<1 0 43 13 <1 0 <1 0 68
<1 0 28 12 <1 0 <1 0 7 1
<1 0 38 12 <1 0 <1 0 70
<1 0 41 11 <1 0 <1 0 72
<1 0 34 10 <1 0 <1 0 70
<1 0 35 9 <1 0 <1 0 72
<1 0 37
30
10 <1 0 <1 0 75
60
<10 79 <1 0 <1 0
<1 0 22 7S <1 0 <1 0 58
<1 0 39 84 <1 0 <1 0 80
Well
Sampling Event
TW4-4
1st Qfa-3/16/05
2nd Qfa-5/25/05
3rd Qfa-8/31/05
4tti Qfa-12/7/05
1st Qbr 3/9/06
2nd Qfa-6/14/06
3rd Qfa-7/20/06
4Ui Qfa-11/8/06
1st Qfa-2/28/07
2nd Qfa-6/27/07
3rd Qfa-8/15/07
4tti Qfa-10/10/07
1st Qfa-3/28/08
2nd Qfa-6/25/08
3rd Qfa-9/10/08
4tti Qfa-10/15/08
4tti Qfa-11/18/09
1st Qfa-3/4/09"
2nd Qfa-6/23/09
3rd Qbr 9/14/09
4tti Qb-12/29/09
1st Qfa-2/17/10
2nd Qfa-6/14/10
3rd Qfa-8/10/10
4tti Qfa-10/15/10
IstQb-2/23/11
2nd Qfa-6/1/11
3rd Qb-8/17/11
4tti Qfa-11/16/11
1st Qfa-1/23/12
2nd Qfa-6/6/12
TW4-5
1st Qfa-3/16/05
2nd Qfa-5/25/05
3rd Qfa-8/31/05
4tti Qfa-12/7/05
1st Qfa-3/9/06
2nd Qb-6/14/06
3rd Qb-7/20/06
4tti Qfa-11/8/06
1st Qfa-2/28/07
2nd Qb-6/27/07
3rd Qb-8/15/07
4tti Qb-10/10/07
IstQb-3/28/08
2nd Qb-6/25/08
3rd Qfa-9/10/08
4ttiQb-10/15/08
IstQb-3/4/09
2nd Qb-6/23/09
3rd Qfa-9/14/09
4ttiQb-12/29/09
1st Qfa-2/25/10
2nd Qb-6/14/10
3rd Qfa-8/11/10
4th Qfa-10/15/10
1st Qfa-2/22/11
2nd Qb-5/26/11
3rd Qfa-8/7/11
4th Qfa-11/16/11
'^'12/7/11
1st Qfa-1/18/12
2nd Qfa-6/6/12
(1) VOCs were resampled because laboratory missed holding
NA = not analyzed
NS = not sampled
Bold and red = highist concentrafaon since monfaonng started
Bold and blue = lowest concenfaataon since monfaonng started
Shaded indicates concenbabons exceeding GWQS
Bold and italics indicates ttie MDL exceeded ttie GWQS
1 st Cttr = January - March
2nd Qtr = Apnl - June
3rd Qfa- = July - September
4th Qfa- = October - December
fame
TABLE 1
Historic Summary Of Monitoring Parameters Up To The 2nd Quarter 2012
Chloroform Contamination Investigation
DUSA White Mesa Mill
Parameter
GWQS
Carbon Tetrachlonde Chloride Chloroform Chloromethane Methylene Chlonde Nitrate, Nitrate + Nitrite
(mg/L)
(5 pg/L) [No GWQS (70 pg/L) (30 pg/L) (5 pg/L) (10 mg/L)
NA NA <1 0 NA NA 02
NA NA 25 NA NA 04
<1 0 NA 10 28 <1 0 08
<1 0 32 17 1 3 <1 0 09
<1 0 31 31 <1 0 <1 0 1 2
<1 0 30 19 <1 0 <1 0 1 0
<1 0 37 11 <1 0 <1 0 06
<1 0 65 42 8 <1 0 <1 0 1 4
<1 0 32 46 <1 0 <1 0 1 8
<1 0 38 11 <1 0 <1 0 06
<1 0 36 18 <1 0 <1 0 07
<1 0 36 18 <1 0 <1 0 08
<1 0 33 52 <1 0 <1 0 1 1
<1 0 35 24 <1 0 <1 0 09
<1 0 35 39 <1 0 <1 0 1 1
<1 0 33 37 <1 0 <1 0 1 0
<1 0 35 81 <i o" <1 0 22
<1 0 37 120 <1 0 <1 0 27
<1 0 37 280 <1 0 <1 0 50
<1 0 41 250 <1 0 <1 0 61
<1 0 45 <1 0 <1 0 1 8
<1 0 33 590 <1 0 <1 0 25
<1 0 31 630 <1 0 <1 0 39
<1 0 41 420 <1 0 <1 0 43
<1 0 40 47 <1 0 <1 0 07
<1 0 42 96 <1 0 <1 0 03
<1 0 39
36
16 <1 0 <1 0
c
03
08
<1 0 21 <1 0 <1 0
<1 0 33 50 <1 0 <1 0 08
<1 0 38 38 <1 0 <1 0 07
<1 0 40 47 <1 0 <1 0 02
NA NA NA NA 52
NA NA 2.700 NA NA 54
<10 NA <10 <10 52
<so 52 2.500 <50 <so 53
<so 48 1.900 <50 <so 1
<50 47 2.200 <50 <so 45
<50 51 2.140 <50 <so 47
1 5 49 2.160 <1 0 <1 0 46
1 l' 47 1.830 <1 0 <1 0 6
1 5 45 2,600 <1 0 <1 0 51
1 4 44 2,300 <1 0 <1 0 47
1 2 45 1,900 <1 0 <1 0 47
1 3 43 2,200 <1 0 <1 0 42
1 3 43 1.800 <1 0 <1 0 48
1 4 35 1,600 <1 0 <1 0 4 16
NA 40 NA NA NA 4 01
<2 0 NA 2,500 <2 0 <2 0 NA
1 2 35 1,800 <1 0 <1 0 37
<1 0 37 1,400 <1 0 <1 0 38
1 37 1,500 <1 0 <1 0 4 1
<1 0 37 1,300 <1 0 <1 0 42
<1 0 35 1,200 <1 0 <1 0 38
<1 0 31 1,100 <1 0 <1 0 39
1 36 1.500 <1 0 <1 0 39
<1 0 38 1.100 <1 0 <1 0 4
<1 0 45 1.300 <1 0 <1 0 36
<1 0 35 1.200 <1 0 <1 0 40
<1 0 37 1.200 <1 0 <1 0 4 1
<1 0 37 1.000 <1 0 <1 0 38
<1 0 37 1,000 <1 0 <1 0 39
<1 0 41 —: <1 0 <1 0 40
Well
Sampling Event
ITW4-6
1st Qfa-3/16/05
2nd Qb- 5/25/05
3rd Qb-8/31/05
4tti Qb-12/7/05
1st Qfa-3/9/06
2nd Qb-6/14/06
3rd Qfa-7/20/06
4tti Qfa-11/8/06
1st Qfa-2/28/07
2nd Qfa-6/27/07
3rd Qfa-8/15/07
4tti Qfa-10/10/07
1st Qfa-3/28/08
2nd Qfa-6/25/08
3rd Qfa-9/10/08
4tti Qfa-10/15/08
1st Qfa-3/11/09
2nd Qfa- 6/23/09
3rd Qfa-9/14/09
4th Qfa-12/29/09
1st Qfa-2/25/10
2nd Qfa-6/14/10
3rd Qfa-8/11/10
4tti Qfa-10/15/10
1st Qfa-2/23/11
2nd Qb-5/26/11
3rd Qb-8/17/11
4ttiQb-11/16/11
12/7/11
'^'11/16/11
IstQb-1/18/12
2nd Qfa-6/13/12
TW4-7
1st Qfa-3/16/05
2nd Qfa-5/25/05
3rd Qfa-8/31/05
4tti Qfa-12/7/05
1st Qfa-3/9/06
2nd Qfa-6/14/06
3rd Qfa-7/20/06
4tti Qfa-11/8/06
1st Qfa-2/28/07
2nd Qfa-6/27/07
3rd Qb-8/15/07
4tti Qbr 10/10/07
IstQb-3/28/08
2nd Qfa-6/25/08
3rd Qb-9/10/08
4tti Qbr 10/15/08
4tti Qfa-11/18/09
IstQb-3/11/09
2nd Qb-6/23/09
3rd Qb-9/14/09
4tti Qfa-12/29/09
IstQb-3/3/10
2nd Qfa-6/14/10
3rd Qb-8/11/10
4tti Qbr 10/15/10
IstQb-2/23/11
2nd Qfa-6/1/11
3rd Qb-8/18/11
4tti Qfa-11/29/11
1st Qfa-1/19/12
2nd Qbr 6/14/12
(1) VOCs were resampled because laboratory missed holding
(2) Results of ttie TW4-70 ttie duplicate sample for TW4-6
NA = not analyzed
NS = not sampled
Shaded indicates concenbabons exceeding GWQS
Bold and red = highest concenbabon since monfaonng started
Bold and blue = lowest concenbabon since monfaonng started
Bold and italics indicates the MDL exceeded ttie GWQS
1st Qfa- = January - March
2nd Qfa- = Apnl - June
3rd Qb- = July - September
4th Qfa- = October - December
tame
TABLE 1
Historic Summary Of Momtonng Parameters Up To The 2nd Quarter 2012
Chloroform Contamination Investigation
DUSA White Mesa Mill
Well Parameter
Sampling Event GWQS
Carbon Tetrachloride Chloride Chloroform Chloromethane Methylene Chloride Nitrate, Nitrate + Nitnte
(mg/L)
(5 pg/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 <01
2nd Qfa-5/25/05 NA NA <1 0 NA NA 02
3rd Qb-8/31/05 <1 0 NA 11 1 7 NA <1 0
4tti Qfa-12/7/05 <1 0 41 <1 0 <1 0 <1 0 <1 0
1st Qfa-3/9/06 <1 0 39 1 3 2 l" <1 0 03
2nd Qb-6/14/06 <1 0 37 1 8 1 0 <1 0 <1 0
3rd Qb-7/20/06 <1 0 39 <1 0 <1 0 <1 0 0 1
4ttiQb-11/8/06 <1 0 40 <1 0 <1 0 <1 0 <1
1st Qfa-2/28/07 <1 0 39 25 <1 0 <1 0 07
2nd"Qtr 6/27/07 <1 0 42 25 <1 0 <1 0 02
3rd Qfa-8/15/07 <1 0 42 1 5 <1 6 <1 0 <1 0
4tti Qfa-10/10/07 <1 0 43 35 <1 0 <1 0 05
1st Qfa-3/28/08 <1 0 46 •<i 0 <1 0 <1 0 0 1
2nd Qfa-6/25/08 <1 0 45 <1 0 <1 0 <1 0 <1 0
3rd Qb-9/10/08 <1 0 39 <1 0 <1 0 <1 0 <0 05
4tti Qfa-10/15/08 <1 0 44 <1 0 <1 0 <1 0 <0 05
IstQb-3/4/09 <1 0 42 <1 0 <1 0 <1 0 <o"i
2nd Qb-6/23/09 <1 0 44 <1 0 <1 0 <1 0 <0 1
3rd Qb-9/14/09 <1C 44 <1 0 <1 0 <1 0 <0 1
4ttiQb-12/17/09 <1 0 51 <1 0 <1 0 <1 0 <0 1
1st Qfa-2/24/10 <1 0 57 <1 0 <1 0 <1 0 <0 1
2nd Qfa-6/14/10 <1 0 42 <1 0 <1 0 <1 0 <0 1
3rd Qfa-8/18/10 <1 0 45 <1 0 <1 0 <1 0 <0 1
4tti Qfa-10/15/10 <1 0 46 <1 0 <1 0 <1 0 0 1
IstQb-2/16/11 <1 0 52 <1 0 <1 0 <1 0 <01
2nd Qfa-5/25/11 <1 0 45 <1 0 <1 0 <1 0 01
3rd Qb-8/16/11 <1 0 46 <1 0 <1 0 <1 0 0 1
4ttiQb-11/16/11 45 02
<''l 2/7/11 <1 0 <1 0 <1 0 <1 0
IstQb-1/18/12 <1 0 45 <1 0 <1 0 <1 0 03
2nd Qb-5/13/12 <1 0 44 <1 0 <1 0 <1 0 02
TW4-9
1st Qfa-3/16/05 NA NA 38 NA NA 1 3
2nd Qfa-5/25/05 NA NA 1 2 NA NA 1 3
3rd Qfa-8/31/05 <1 0 NA <1 0 29 <1 0 1 3
4tti Qfa-12/7/05 <1 0 42 <1 0 <1 0 <1 0 1 3
IstQb-3/9/06 <1 0 38 <1 0 2 6 <1 0 " 1 5
2nd Qb-6/14/06 <1 0 39 19 27 <1 0 1 5
3rd Qfa-7/20/06 <1 0 41 <1 0 <1 0 <1 0 09
4tti Qfa-11/8/06 <10 44 <1 0 <1 0 <1 0 07
IstQb-2/28/07 <1 0 44 <1 0 <1 0 <1 0 06
2nd Qb-6/27/07 <1 0 42 21 <1 0 <1 0 1 3
3rd Qb-8/15/07 <1 0 38 95 <1 0 <1 0 1 8
4ttiQb-10/10/07 <1 0 40 87 <1 0 <1 0 2
1st Qtr 3/28/08 <1 0 35 1 3 <1 0 <1 0 2 1
2nd Qb-6/25/08 <1 0 35 1 <1 0 <1 0 23
3rd Qb-9/10/08 <1 0 28 •ei 0 <1 0 <1 0 2 79
4tti Qfa-10/15/08 <1 0 58 <1 0 <1 0 <1 0 1 99
1st Qfa-3/4/09 <1 0 30 <1 0 <1 0 <1 0 25
2nd Qfa-6/23/09 <1 0 30 <1 0 <1 0 <1 0 23
3rd Qfa-9/14/09 <1 0 " "30 <1 0 <1 0 <1 0 25
4ttiQb-12/17/09 <1 0 37 <1 0 <1 0 <1 0 1 7
1st Qfa-2/23/10 <1 0 47 <1 0 <1 0 <1 0 1 4
2nd Qb-6/14/10 <1 0 33 <1 0 <1 0 <1 0 1 5
3rd Qbr 8/13/10 <10 40 <1 0 <io" <1 0 1 2
4tti Qfa-10/15/10 <1 0 34 <1 0 <1 0 <1 0 1 8
1st Qfa-2/17/11 <1 0 41 <1 0 <1 0 <1 0 1 3
2nd Qfa-5/25/11 <1 0 38 <1 0 <1 0 <1 0 3"4
3rd Qtr 8/16/11 <1 0 21 <1 0 <1 0 <1 0 4
4tti Qfa-11/16/11 38 23
(1)12/7/11 <1 0 <1 0 <1 0 <1 0
1st Qfa-1/18/12 <1 0 28 <1 0 <1 0 <1 0 23
2nd Qb-5/31/12 <1 0 23 <1 0 <1 0 <1 0 40
(1) VOCs were resampled because laboratory missed holding fame
NA = not analyzed
NS = not sampled
Shaded indicates concenbabons exceeding GWQS
Bold and red = highest concenbabon since monfaonng started
Bold and blue = lowest concenbabon since monfaonng started
Bold and italics indicates ttie MDL exceeded ttie GWQS
1st Qfa- = January - March
2nd Qfa- = Apnl - June
3rd Qfa- = July - September
4tti Qfr = October - December
TABLE 1
Histonc Summary Of Momtonng Parameters Up To The 2nd Quarter 2012
Chloroform Contamination Investigation
DUSA White Mesa Mill
Well Parameter
Sampling Event GWQS
Carbon Tetrachlonde Chloride Chloroform Chloromethane Methylene Chlonde Nitrate, Nitrate + Nitnte
(mg/L)
(Spgrt.) No GWQS (70 pg/L) (30 pg/L) (5 pg/L) (10 mg/L)
TW4-10
1st Qfa-3/16/05 NA NA " 140 NA NA 1 6
2nd Qb-5/25/05 NA NA •"•62 4 NA NA 08
3rd Qfa-8/31/05 <2 5 NA 1l6 62 <2 5 1 1
4tti Qfa-12/7/05 <2 5 52 300 <2 5 <2 5 33
1st Qfa-3/9/06 <50 50 190 <5 0 <5 0 24
2nd Qbr 6/14/06 <5 0 54 300 <5 0 <5 0 35
3rd Qb-7/20/06 <5 0 61 504 <5 0 <5 0 68
4ttiQb-11/8/06 <1 0 58 452 1 6 <1 0 57
IstQb-2/28/07 <1 0 2 500 <1 0 <1 0 73
2nd Qb-6/27/07 <1 0 54 350 <1 0 <1 0 51
3rd Qb-8/15/07 <1 0 59 660 <1 0 <1 0 73
4tt)Qb-10/10/07 <1 0 59 470 <1 0 <1 0 67
IstQb-3/28/08" <1 0 55 620 <1 0 <1 0 73
2nd 0^6/25/08 <1 0 58 720 <1 0 <1 0 99
3rd Qb-9/10/08 <1 0 51 660 <1 0 <1 0 9 23
4tti Qfa-10/15/08 NA 61 NA NA NA 16 5
4tti Qfa-11/18/09 <2 0 NA <2 0 <2 0 NA
IstQb-3/11/09 <1 0 64 1,100 <1 0 <1 0 "11 6
2nd Qfa-6/23/09 <1 0 62 <1 0 <1 0 98
3rd Qb-9/14/09 <1 0 51 910 <1 0 <1 0 81
4ttiQb-12/22/09 <1 0 51 300 <1 0 <1 0 38
IstQb-3/3/10 <1 0 48 460 <1 0 <1 0 50
2nd Qfa-6/14/10 <1 0 42 220 <1 0 <1 0 1 6
3rd bfa-8/12/10 <1 0 38 100 <1 0 <1 0 08
4tti Qfa-10/15/10 <1 0 52 " 1100 <1 0 <1 0 " l"l 6
IstQb-2/23/11 <1 0 32 620 <1 0 <1 0 90
2nd Qfa-6/14/11 <1 0 42 280 <1 0 <1 0 33
3rd Qb-8/17/11 <1 0 41 180 <1 0 <1 0 1 9
4tti Qfa-11/16/11 <1 0 45 110 <1 0 <1 0 1 1
1st Qfa-1/19/12 <1 0 40 <1 0 <1 0 09
2nd Qb-6/14/11 <1 0 46 79 <1 0 <1 0 08
TW4-11
1st Qfa-3/16/05 NA NA 4,466 NA NA 87
2nd Qfa-5/25/05 NA NA 3,590 NA NA 10 3
3rd Qfa-8/31/05 <10 NA 4,400 <10 <10 ""9 4
4tti Qfa-12/7/05 <100 58 4,400 <100 <100 94
1stCttr"3/9/06 <so 56 4,400 <so <S0 92
2nd Qfa-6/14/06 <50 56 4,300 <50 <S0 10 0
3rd Qfa-7/20/06 <S0 55 4,080 <so <50 100
4tti Qfa-11/8/06" 1 7 55 3.660 2 7 1 3 10 0
1st Qfa-2/28/07 1 3 54' 3,600 <1 0 1 6 101
2nd Qfa-6/27/07 1 6 53 3,800 <1 0 <1 0 10 6
3rd Qfa-8/15/07 1 7 53 <1 0 <1 0 •10 2
4tti Qb-10/10/07 1 6 53 4,400 <1 0 1 2 '"9 8
1st Qfa-3/28/08 <1 0 63 <1 0 <1 0 77
2nd Qb-6/25/08 <1 0 46 640 <1 0 <1 0 73
3rd Qb-9/10/08 <1 0 42 900 <1 0 <1 0 79
4ttiQb-10/15/08 NA 47 NA ' NA NA 95
4tti Qfa-11/18/09 <2 0 NA " 1,660 <2 0 <2 0 NA
1st Qfa-3/11/09 <1 0 49 1,000 <1 0 <1 0 73
2nd Qb-6/23/09 <1 0 44 980 <1 0 <1 0 68
3rd Qfa-9/14/09 <1 0 49 1,000 <1 0 <1 0 70
4tti Qfa-12/29/09 <1 0 46 860 <1 0 <1 0 66
1st Qfa-3/3/10 <1 0 42 820 <1 0 <1 0 68
2nd Qb-6/14/10 <1 0 40 820 <1 0 <1 0 69
3rd Qfa-8/12/10 <1 0 43 800 <1 0 <1 0 67
4ttiQb-10/15/10 <1 0 49 720 <1 0 <1 0 64
1st Qfa-2/23/11 <1 0 46 1,000 <1 0 <1 0 65
2nd Qfa-6/1/II <1 0 49 930 <1 0 <1 0 73
3rd Qfa-8/17/11 <1 0 48 820 <1 0 <1 0 7 1
4tti Qfa-11/16/11 <1 0 46 1500 <1 0 <1 0 7 1
lstQfa-i/24/12 <1 0 43 610 <1 0 <1 0 68
2nd Qb-6/13/12 <1 0 52 " 660 <1 0 <1 0 67
(1) VOCs were resampled because laboratory missed holding
NA = not analyzed
NS = not sampled
Shaded indicates concenbabons exceeding GWQS
Bold and red = highest concentrafaon since monfaonng started
Bold and blue = lowest concentrafaon since monfaonng started
Bold and italics indicates ttie MDL exceeded the GWQS
1st Qfa- = January - March
2nd Qfa- = Apnl - June
3rd Qfa- = July - September
4tti Qfa- = October - December
fame
TABLE 1
Historic Summary Of Momtonng Parameters Up To The 2nd Quarter 2012
Chloroform Contamination Investigation
DUSAWhite Mesa Mill
Well Parameter
Sampling Event GWQS
Carbon Tetrachlonde Chlonde
(mg/L)
Chloroform Chloromethane Methylene Chlonde Nitrate, Nitrate ••• Nitrite
(SpgflL) No GWQS (70 pg/L) (30 pg/L) (5 pg/L) (10 mg/L)
TW4-12
IstQb-3/16/05 NA NA <1 0 NA NA 1 4
2nd Qb-5/25/05 NA NA <1 0 NA NA 1 6
3rd Qb-8/31/05 <1 0 NA <1 0 58 <1 0 1 5
4tti Qfa-12/7/05 <1 0 19 <1 0 1 0 <1 0 1 4
1st Qfa-3/9/06 <1 0 19 <1 0 2 6 <1 0 1 3
2nd Qb-6/14/06 <1 0 16 <1 0 1 4 <1 0 1 4
3rd Qb-7/20/06 <1 0 16 <1 0 1 4 <1 0 1 4
4ttiQb-11/8/06 <1 0 16 <1 0 <1 0 <1 0 1 4
IstQb-2/28/07 <1 0 16 <1 0 <1 0 <1 0 1 5
2nd Qb-6/27/07 <1 0 18 <1 0 <1 0 <1 0 1 5
3rd Qfa-8/15/07 <1 0 29 <1 0 <1 0 <1 0 1 4
4tti Qb-10/10/07 <1 0 16 <1 0 <1 0 <1 0 1 4
IstQb-3/28/08 <10 " 16 <1 0 <1 0 <1 0 1 6
2nd Qb-6/25/08 <1 0 19 <1 0 <1 0 <1 0 27
3rd Qfa-9/10/08 <1 0 18 <1 0 <1 0 <1 0 27
4tti Qfa-10/15/08 <1 0 22 <1 0 <1 0 <1 0 25
1st Qfa-3/11/09 <10 " 23 <1 0 <i o' <1 0 24
2nd Qfa-6/23/09 <1 0 22 <1 0 <1 0 <1 0 38
3rd Qfa-9/14/09 <1 0 22 <1 0 <1 0 <1 0 51
4tti Qfa-12/16/09 <1 0 23 <1 0 <1 0 <1 0 36
1st Qfa-2/23/10 <1 0 22 <1 0 <1 0 <1 0 40
2nd Qfa-6/14/10 <1 0 29 <1 0 <1 0 <1 0 r,m
3rd Qb-8/10/10 <1 0 35 <1 0 <1 0 <1 0 90
4tti Qfa-10/15/10 <1 0 31 <1 0 <1 0 <1 0 80
1st Qtr 2/15/11 <1 0 31 <1 0 <1 0 <1 0 65
2nd Qfa-5/25/11 <1 0 32 <1 0 <1 0 <1 0 7
3rd Qfa-8/16/11 <1 0 31 <1 0 <1 0 <1 0 68
4tti Qfa-11/15/11 <1 0 30 <1 0 <1 0 <1 0 80
1st Qfa-1/17/12 <1 0 28 <1 0 <1 0 <1 0 77
2nd Qfa-5/31/12 <1 0 34 <1 0 <1 0 <1 0 ^:a^ol
TW4-13
1st Qfa-3/16/05 NA NA <1 0 NA NA 42
2nd Qb-5/25/05 NA NA <1 0 NA NA 43
3rd Qfa-8/31/05 <1 0 NA <1 0 3 1 <1 0 46
4tti Qb-12/7/05 <1 0 69 <1 0 <1 0 <1 0 43
1st Qtr 3/9/06" <1 0 67 <1 0 1 7 <1 0 42
2nd Qfa-6/14/06 <:1 0 66 <1 0 1 4 <10 49
3rd Qfa-7/20/06 <1 0 65 <1 0 <10 <1 0 43
4tti Qfa-11/8/06 <1 0 33 <1 0 <1 0 <1 0 08
1st Qfa-2/28/07 <1 0 59 <1 0 <1 0 <1 0 40
2nd Qfa-6/27/07 <1 0 59 <1 0 <1 0 <1 0 46
3rd Qb-8/15/07 <1 0 58 <1 0 <1 0 <1 0 44
4ttiQb-10/10/07 <1 0 58 <1 0 <1 0 <1 0 41
IstQb-3/28/08 <i"o 54 <1 0 <1 0 <1 0 38
2nd Qfa-6/25/08 <1 0 58 <1 0 <1 0 <1 0 42
3rd Qfa-9/10/08 <1 0 50 <1 0 <1 0 <1 0 43
4tti Qfa-10/15/08 <1 0 58 <1 0 <1 0 <1 0 46
1st Qfa-3/4/09 <1 0 58 <1 0 <1 0 <1 0 37
2nd Qfa-6/23/09 <1 0 57 <1 0 <1 0 <1 0 1 2
3rd Qb-9/14/09 <1 0 63" <1 0 <1 0 <1 0 47
4tti Qtr 12/16/09 <1 0 60 <1 0 <1 0 <1 0 4 1
IstQb-2/24/10 <1 0 53 <1 0 <1 0 <1 0 43
2nd Qfa-6/14/10 <1 0 53 <1 0 <1 0 <1 0 " 52
3rd Qfa-8/10/10 <1 0 55 <1 0 <1 0 <1 0 56
4tti Qfa-10/15/10 <1 0 55 <1 0 <1 0 <1 0 58
1st Qb-"2/15/11 <1 0 60 <1 0 <1 0 <1 0 55
2nd Qb-5/25/11 <1 0 56 <1 0 <1 0 <1 0 64
3rd Qb-8/16/11 <1 0 60 <1 0 <1 0 <1 0 52
4ttiQb-11/15/11 <1 0 54 <1 0 <1 0 <1 0 59
IstQb-1/17/12 <1 0 55 <1 0 <1 0 <1 0 55
2nd Qb-5/31/12 <1 0 59 <1 0 <1 0 <1 0 60
NA - not analyzed
NS = not sampled
Shaded indicates concenfaafaons exceeding GWQS
Bold and italics indicates ttie MDL exceeded ttie GWQS
1st Qfa- = January - March
2nd Qfa- = Apnl - June
3rd Qfa- = July - September
4tti Qfa- = October - December
TABLE 1
Historic Summary Of Monitoring Parameters Up To The 2nd Quarter 2012
Chloroform Contamination Investigation
DUSAWhite Mesa Mill
Well
Sampling Event
Parameter
GWQS
Well
Sampling Event
Carbon Tetrachlonde
(5 pg/L)
Chlonde
(mg/L)
No GWQS
Chloroform
(70pgrt.)
Chloromethane
(30 mIL)
Methylene Chlonde
(Spgfl.)
Nitrate. Nitrate Nitrite
(10 mg/L)
TW4-14
1st Qfa-3/16/05 NS NS NS NS NS NS
2nd Qb-5/25/05 NS NS NS NS NS NS
3rd Qbr 8/31/05 NS NS NS NS NS NS
4tti Qb-12/7/05 NS NS NS NS NS NS
1st Qfa-3/9/06 NS NS NS NS NS NS
2nd Qfa-6/14/06 NS NS NS NS NS NS
3rd Qfa-7/20/06 NS NS NS NS NS NS
4tti Qfa-11/8/06 <1 0 37 NS <1 0 <1 0 24
IstQb-2/28/07 <1 0 38 <1 0 <1 0 <1 0 23
2nd Qb-6/27/07 <1 0 38 <1 0 <1 0 <1 0 1 4
3rd Qfa-8/15/07 <1 0 36 <1 0 <1 0 <1 0 1 1
4tti Qb-10/10/07 <1 0 38 <1 0 <1 0 <1 0 08
1st Qfa-3/28/08 " <1 0 57 <1 0 <1 0 <1 0 04
2nd Qb-6/25/08 <1 0 35 <1 0 <1 0 <1 0 1 6
3rd Qfa-9/10/08 <1 0 34 <1 0 <1 0 <1 0 1 38
4Ui Qfa-10/15/08 <1 0 40 <1 0 <1 0 <1 0 0 76
1st Qfa-3/4/09 <1 0 35 <1 0 <1 0 <1 0 1 6
2nd Qfa-6/23/09 <1 0 36 <1 0 <1 0 <1 0 1 4
3rd Qfa-9/14/09 <1 0 38 <1 0 <1 0 <1 0 1 5
4tti Qfa-12/16/09 <1 0 34 <1 0 <1 0 <1 0 1 4
IstQb-3/3/10 <1 0 33 <1 0 <1 0 <1 0 25
2nd Qtr 6/14/10 <1 0 49 <1 0 <1 0 <10 29
3rd Qb-8/10/10 <1 0 35 <1 0 <1 0 <1 0 28
4tti Qfa-10/15/10 <1 0 29 <1 0 <1 0 <1 0 29
1st Qfa-2/15/11 <1 0 25 <1 0 <1 0 <1 0 1 8
2nd Qb-6/14/11 <1 0 24 <1 0 <1 0 <1 0 1 4
3rd Qfa-8/16/11 <1 0 33 <1 0 <1 0 <1 0 26
4ttiQb-11/15/11 <1 0 15 <1 0 <1 0 <1 0 1 7
IstQb-1/17/12 <1 0 20 <1 0 <1 0 <1 0 1 9
2nd Qb-6/14/11 <1 0 35 <1 0 <1 0 <1 0 33
TW4-16
IstQb-3/16/05 NA NA 240 NA NA <01
2nd Qb-5/25/05 NA NA 212 NA NA <01
3rd Qfa-8/31/05 <1 0 NA 85 32 43 <01
4tti Qb-12/7/05 <1 0 64 14 26 59 1 4
1st Qfa-3/9/06 -il 0 60 39 1 l' 21 3
2nd Qfa-6/14/06 <1 0 55 13 24 89 1 9
3rd Qfa-7/20/06 <1 0 60 52 <1 0 27 27
4tti Qfa-11/8/06 <1 0 62 13 6 <1 0 92 56
1st Qfa-2/28/07 <1 0 79 87 <1 0 66 12 3
2nd Qfa-6/27/07 <1 0 75 26 <1 0 1 8 99
3rd Qfa-8/15/07 <1 0 65 71 <1 0 51 54
4tti Qfa-10/10/07 <1 0 69 1 4 <1 0 1 44
1st Qfa-3/28/08 <10 52 11 <1 0 "26 <0 1
2nd Qfa-6/25/08 <1 0 "58 <1 0 <1 0 <1 0 1 5
3rd Qfa-9/10/08 <1 0 71 10 <1 0 14 10 5
4tti Qfa-10/15/08 <1 0 89 39 <1 0 66 98
1st Qfa-3/4/09 <1 0 73 <1 0 <1 0 <1 0 96
2nd Qfa-6/23/09 <1 0 76 <1 0 <1 0 <1 0 89
3rd Qfa-9/14/09 <1 0 79 <1 0 <1 0 <1 0 88
4ttiQb-12/17/09 <1 0 76 <1 0 <1 0^ <1 0 52
IstQb-2/24/10 <1 0 77 <1 0 <i o" <1 0 42
2nd Qfa-6/14/10 <1 0 64 21 <1 0 <1 0 47
3rd Qb-8/24/10 <1 0 72 43 <1 0 <1 0 46
4tti Qfa-10/15/10 <1 0 71 3 <1 0 <1 0 33
IstQb-2/22/11 <1 0 86 15 <1 0 <1 0 7
2nd Qtr 5/26/11 <10 81 16 <10 <10 5
3rd Qfa-8/17/11 <1 0 63 92 <1 0 <1 0 1 7
4ttiQb-11/16/11 38 04
'^'12/7/11 <1 0 <1 0 <1 0 1 4
IstQb-1/18/12 <1 0 48 <1 0 <1 0 1 7 0 1
2nd Qb-5/26/11 <1 0 53 <1 0 <1 0 <1 0 <0 1
(1) VOCs were resampled because laboratory missed holding fame
NA = not analyzed
NS = not sampled
Bold and red = highest concentrafaon since monfaonng started
Bold and blue = lowest concentrafaon since monfaonng started
Shaded indicates concenbabons exceeding GWQS
Bold and italics indicates ttie MOL exceeded ttie GWQS
1 st Qtr = January - March
2nd Qfa- = Apnl - June
3rd Qfa- = July - September
4tti Qfa- = October - December
TABLE 1
Historic Summary Of Momtonng Parameters Up To The 2nd Quarter 2012
Chloroform Contamination Investigation
DUSAWhite Mesa Mill
Parameter
GWQS
Carbon Tetrachlonde Chloride Chloroform Chloromethane Methylene Chlonde 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 14 1
NA NA 29 8 NA NA 129
<1 0 NA 39 28 <1 0 13 3
<1 0 41 14 11 <1 0 73
<1 0 36 12 1 6 <1 0 59
<1 0 35 12 27 <1 0 47
<1 0 35 10 8 <1 0 <1 0 61
<1 0 34 125 <1 0 <1 0 57
<1 0 30 9 2 <1 0 <1 0 51
<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 <1 0 49
<1 0 30 94 <1 0 <1 0 52
<1 0 29 1l' <i o" <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
<io" 41 69 <1 0 <1 0 51
<1 0 35 29 <1 0 <1 0 90
<1 0 37 29 <1 0 <1 0 90
<1 0 50 30 <1 0 <1 0
<1 0 52 39 <1 0 <1 0 10 6
<1 0 36 26 <1 0 <1 0 " 90
<1 0 23
23
29 <1 0 <1 0 46
63
<1 0 28 <1 0 <1 0
<1 0 18 25 <1 0 <1 0 44
<1 0 30 24 <1 0 <1 0 66
NA NA 2.200 NA NA 53
NA NA 1.200 NA NA 57
<50 NA 1.400 <50 <5 0 46
<50 81 2 800 <50 <50 <01
<"50 86 1.200 <50 <50 4
<50 116 1,100 <50 <50 52
<50 123 1,120 <50 <50 43
1 6 134 1.050 2 6 <1 0 46
1 3 133 1.200 <1 0 <1 0 4
Did not sample
1 9 129 1.100 <1 0 <1 0 4 1
1 9 132 1,100 <1 0 <1 0 4
2 9 131 1,800 <1 0 <1 0 22
<1 0 128 1,000 <1 0 <1 0 28
86 113 3,600 <1 0 <1 0 35 2
12 124 4,200 <1 0 <1 0 47 8
1 2 127 1.100 <1 0 <1 0 32
1 2 132 990 <1 0 <1 0 24
15 43 <10 <1 0 <0 1
16 124 4.700 <1 0 <1 0 ""26'7
1 3 144 mi <1 0 <1 0 2
42 132 1.800 <1 0 <1 0 44
49 142 "2^000 <1 0 <1 0 59
1 3 146 1J200 <1 0 <1 0 27
17 135 3.400 <1 0 <1 0 17 0
8 3 148 4.000 <1 0 <1 0 12 0
21 148 970 <1 0 <1 0 30
148 50
54 2^200 <1 0 <1 0
15 138 650 <1 0 <1 0 06
1 1 149 460 <1 0 <1 0 24
Well
Sampling Event
TW4-18
1st Qtr 3/16/05
2nd Qb- 5/25/05
3rd Qfa-8/31/05
4tti Qfa-12/7/05
1st Qfa-3/9/06
2nd Qfa-6/14/06
3rd Qb-7/20/06
4ttiQb-11/8/06
1st Qfa-2/28/07
2nd Qfa-6/27/07
3rd Qfa-8/15/07
4tti Qfa-10/10/07
IstQb-3/28/08
2nd Qb-6/25/08
3rd Qfar 9/10/08
4tti Qb-10/15/08
1st Qfa-3/4/09
2nd Qfa-6/23/09
3rd Qb-9/14/09
4ttiQb-12/22/09
1st Qfa-2/24/10
2nd Qfa-6/14/10
3rd Qfa-8/12/10
4tti Qfa-10/15/10
IstQb-2/22/11
2nd Qb-5/26/11
3rd Qfa-8/17/11
4ttiQb-11/16/11
12/7/11
1st Qfa-1/18/12
2nd Qfa-6/13/12
TW4-19
1st Qtr 3/16/05
2nd Qfa-5/25/05
3rd Qb-8/31/05
4tti Qtr 12/7/05
1st Qfa-3/9/06
2nd Qfa-6/14/06
3rd Qfa-7/20/06
4tti Qfa-11/8/06
IstQb-2/28/07
2nd Qtr 6/27/07
3rd Qb-8/15/07
4tti Qb-10/10/07
1st Qfa-3/28/08
2nd Qfa-6/25/08
3rd Qb-9/10/08
4ttiQb-10/15/08
1st Qfa-3/4/09
2nd Qfa-6/23/09
3rd Qfa-9/14/09
4tti Qfa-12/22/09
IstQb-2/17/10
2nd Qfa-6/14/10
3rd Qfa-8/16/10
4ttiQb-10/15/10
1st Qfa-2/17/11
2nd Qfa-6/7/11
3rd Qb-8/17/11
4ttiQb-11/17/11
12/5/11
1st Qfa-1/23/12
2nd atr 616112
(1) VOCs were resampled because laboratory missed holding
NA = not analyzed
NS = not sampled
Bold and red = highest concenbabon since monfaonng started
Bold and blue = lowest concenbabon since monfaonng started
Shaded indicates concenfaafaons exceeding GWQS
Bold and italics indicates ttie MDL exceeded tiie GWQS
1st Qfa- = January - March
2nd Qfa- = Apnl - June
3rd Qfa- = July - September
4tti Qfa- = October - December
fame
TABLE 1
Historic Summary Of Momtonng Parameters Up To The 2nd Quarter 2012
Chloroform Contamination Investigation
DUSAWhite Mesa Mill
Well Parameter
Sampling Event GWQS
Carbon Tetrachloride Chlonde Chloroform Chloromethane Methylene Chlonde Nitrate, Nitrate + Nitrite
(Spgfl.)
(mgrt.)
;NO GWQS (70 pg/L) (30 pg/L) (5 pg/L) (10 mg/L)
TW4-20
1st Qfa-3/16/05 Monitor well was not installed
2nd Qfa-5/25/05 NA NA 39.000 NA NA 101
3rd Qfa-8/31/05 <10 NA 3.800 <10 <10 29
4tti Qfa-12/7/05 <2S0 131 19.000 <250 <2S0 1 8
1st Qfa-3/9/06 <500 120 9.200 <500 <S00 38
2nd Qfa-6/14/06 <S00 235 <500 <500 94
3rd Qb-7/20/06 <1000 134 5,300 <1000 <1000 29
4tti Qfa-11/8/06 71 124 11.000 1 9 22 35
1st Qfa-2/28/07 31 124 4,400 <1 0 1 1 42
2nd Qfa-6/27/07 22 112 1,800 <1 0 <1 0 23
3rd Qtr 8/15/07 35 117 5,200 <1 0 1 8 21
4ttiQb-10/10/07 6 8 170 9,000 <1 0 1 9 56
1st Qtr 3/28/08 9 132 13,000 <10 " l"5 09
2nd Qb-6/25/08 13 191 30,000 <1 0 1 2 80
3rd Qfa-9/10/08 15 156 21j,000 <1 0 37 44
4tti Qfa-10/15/08 NA"" "1 168 NA' NA NA 55
1st Qfa-3/4/09 "" 57 164' 8,200 <1 0 52 51
2nd Qfa-6/23/09 4"9 164 6,800 <1 0 • 4 2 29
3rd Qfa-9/14/09 8 4 153 13,000 <1 0 44 33
4ttiQb-12/14/09 14 187 15.000 <1 0 30 53
1st Qfa-2/17/10 "2 7 179 3,500 <1 0 32 20
2nd Qb-6/14/10 "il 200 18.000 <1 0 37 56
3rd Qb-8/16/10 12 196 15.000 <1 0 22 53
4ttiQb-10/15/10 20 203 24.000 <1 0 •55 46
1st Qfa-2/23/11 27 220 31.000 <1 0 19 0 44
2nd Qb-6/1/10 10 177 8.100 <1 0 21 48
3rd Qtr 8/17/11 73 207 3,8"o6 <1 0 31 65
4tti Qfa-11/16/11 72 186 7,900 <1 0 25 42
IstQb-1/23/12 10 207 11.000 <1 0 1 3 79
2nd Qb-6/6/12 33 262 36 000 <1 0 <1 0 ii"o
TW4-21
1st Qfa-3/16/05 Monitor well was not installed
2nd Qfa-5/25/05 NA NA 192 NA NA 'i"4 6
3rd Qb-8/31/05 <5 0 NA <5 0 <5 0 10'l
4tti Qfa-12/7/05 <1 0 353 86 <1 0 <1 0 96
IstQb-3/9/06 <2 5 347 120 <2 5 <2 5 85
2nd Qfa-6/14/06 <2 5 318 120 <2 5" <2 5 162
3rd Qb-7/20/06 <2 5 357 108 <2 5 <2 5 8 9
4tti Qfa-11/8/06 2 296 139 <1 0 <1 0 87
1st Qfa-2/28/07 1 8 306 160 <1 0 <1 0 87
2nd Qfa-6/27/07 I 5 8 327 300 <1 0 <1 0 86
3rd Qbr 8/15/07 '<i o" 300 140 <1 0 <1 0 86
4tti Qfa-10/10/07 <1 0 288 120 <1 0 <1 0 83
1st Qfa-3/28/08 7 331 390 <1 0 <1 0 14 3
2nd Qb-6/25/08 " "i > 271 180 <1 0 <1 0 8 8
3rd Qb-9/10/08 1 6 244 120 <1 0 <1 0 7 57
4ttiQb-10/15/08 NA 284 NA" NA NA 80
4tti Qfa-11/18/09 2 NA 170 <2 0 <2 0 NA
IstQb-3/11/09 <1 0 279 180 <1 0 <10 " 83
2nd Qfa-6/23/09 <1 0 291 200 <1 0 <1 0 81
3rd Qfa-9/14/09 <1 0 281 200 <1 0 <1 0 92
4tti Qfa-12/22/09 <1 0 256 160 <1 0 <1 0 84
IstQb-2/25/10 <1 0 228 170 <1 0 <1 0 84
2nd Qfa-614/10 <1 0 266 210 <1 0 <1 0 120
3rd Qb-8/13/10 9 2 278 390 <1 0 <1 0 14 0
4tti Qfa-10/15/10 210 200 <1 0 <1 0 70
IstQb-2/22/11 1 2 303 230 <1 0 <1 0 90
2nd Qfa-6/28/11 4 8 290 290 <1 0 <1 0 120
3rd Qb-8/17/11 63 287 <1 0 <1 0 •"" • 'i4'6
4tti Qfa-11/16/11 287 13 0
12/7/11 <1 0 <1 0
1st Qfa-1/19/12 6 4 228 420 <1 0 <1 0 "l50
2nd Qfa-6/13/12 -•"5 4 285 " 400 <1 0 <1 0 11 0
(1) VOCs were resampled because laboratory missed holding
NA = not analyzed
NS - not sampled
Bold and red = highest concentrafaon since monfaonng started
Bold and blue = lowest concentrafaon since monfaonng started
Shaded indicates concenbabons exceeding GWQS
Bold and italics indicates ttie MDL exceeded ttie GWQS
1st Qfa- = January - March
2nd Qfa- = Apnl - June
3rd Qfa- = July - September
4tti Qb- = October - December
tame
TABLE 1
Historic Summary Of Monitoring Parameters Up To The 2nd Quarter 2012
Chloroform Contamination Investigation
DUSAWhite Mesa Mill
Well
Sampling Event
Parameter
GWQS
Well
Sampling Event
Carbon Tetrachlonde
(5 pg/L)
Chlonde
(mg/L)
No GWQS
Chloroform
(70 pg/L)
Chloromethane
(30 pg/L)
Methylene Chloride
(5 pg/L)
Nitrate, Nitrate ••• Nitrite
(10 mg/L)
TW4-22
1st Qfa-3/16/05 Monitor well was not installed
2nd Qb-5/25/05 NA NA 340 NA NA "•182
3rd Qb-8/31/05 <5 0 NA 290 <5 0 <5 0 15 7
4ttiQb-12/7/05 <5 0 253 320 <5 0 <5 0 151
1st Qfa-3/9/06 <10 236 390 <10 <10 153
2nd Qb-6/14/06 <10 221 280 <10 <10 14 3
3rd Qb-7/20/06 <10 221 864 <10 <10 14 5
4ttiQb-11/8/06 <1 0 236 350 1 6 <1 0 159
IstQb-2/28/07 <1 0 347 440 <1 0 <1 0 20 9
2nd Qb-6/27/07 <1 0 273 740 <1 0 <1 0 19 3
3rd Qb-8/15/07 <1 0 259 530 <1 0 <1 0 19 3
4ttiQb-10/10/07 <1 0 238 440 <1 0 <1 0 18 8
IstQb-3/28/08 <1 0 519 1,400 <1 0 <1 0 " 391
2nd Qfa-6/25/08 <1 0 271 1,200 <1 0 <1 0 41 9
3rd Qfa-9/10/08 1 3 524 6,300 <1 0 <1 0 38 7
4tii Qfa-10/15/08 NA 539 'NA'" NA NA 36 3
4ttiQb-11/18/09 <2 0 NA 630 <2 0 <2 0 NA
1st Qfa-3/11/09 <1 0 177 390 <1 0 <1 0 "207
2nd Qfa-6/23/09 <1 0 177 730 <1 0 <1 0 20 6
3rd Qfa-9/14/09 <1 0 391 2,300 <1 0 <1 0 40 3
4tti Qfa-12/29/09 <1 0 175 380 <1 0 <1 0 178
1st Qfa-3/3/10 <1 0 427 2,200 <1 0 <1 0 368
2nd Qfa-6/14/10 <1 0 134 540 <1 0 <1 0 19 0
3rd Qfa-8/24/10 <1 0 130 340 <1 0 <1 0 150
4tti Qfa-10/15/10 <1 0 134 340 <1 0 <1 0 160
1st Qfa-2/22/11 1 2 114 1,300 <1 0 <1 0 18 0
2nd Qfa-6/1/11 <1 0 138 210 <1 0 <1 0 17 0
3rd Qb-8/17/11 <1 0 120 450 <1 0 <1 0 150
4tti Qfa-11/16/11 174 19 0
'^'12/7/11 <1 0 "460 <1 0 <1 0
IstQb-1/19/12 <1 0 36 200 <1 0 <1 0 l"4"0
2nd Qb-6/13/12 <1 0 35 120 <1 0 <1 0 12 8
TW4-23
2nd Qfa-6/27/07 <1 0 47 <1 0 <1 0 <1 0 <0 1
3rd Qfa-8/15/07 <1 0 46 <1 0 <1 0 <1 0 <0 1
4tti Qb-10/10/07 <1 0 43 <1 0 <1 0 <1 0 <0 1
1stQfa-"3/28/08 <1 0 41 <1 0 <1 0" <1 0 " <0 1
2nd Qfa-6/25/08 <1 0 41 <1 0 <1 0 <1 0 <0 1
3rd Cttr 9/10/08 <1 0 35 <1 0 <1 0 <1 0 <0 05
4ttiQb-10/15/08 NA 51 NA NA NA <0 05
4ttiQb-11/18/09 <2 0 NA <2 0 <2 0 <2 0 NA
1st Qfa-3/4/09 <1 0 41 <1 0 <1 0 <1 0 <0 1
2nd Qfa-6/23/09 <1 0 43 <1 0 <1 0 <1 0 <0 1
3rd Qfa-9/14/09 <1 0 43 <1 0 <1 0 <1 0 <01
4tti Qfa-12/16/09 <1 0 37 <1 0 <1 0 <1 0 <0 1
IstQb-2/24/10 <1 0 45 <1 0 <1 0 <1 0 <0 1
2nd''Qb-6/14/10 <1 0 40 <1 0 <1 0 <1 0 <01
3rd Qfa-8/24/10 <1 0 40 <1 0 <1 0 <1 0 <0 1
4tti Qfa-10/15/10 <1 0 34 <1 0 <1 0 <1 0 <0 1
1st Qfa-2/16/11 <1 0 44 <1 0 <1 0 <1 0 <01
2nd Qfa-6/14/11 <1 0 44 <1 0 <1 0 <1 0 <01
3rd Qfa-8/16/11 <1 0 41 <1 0 <1 0 <1 0 <01
4tti Qfa-11/15/11 <1 0 43 <1 0 <1 0 <1 0 <01
1st Qfa-1/17/12 <i"o 40 <1 0 <1 0 <1 0 <01
2nd Qfa-5/31/12 <1 0 44 <1 0 <1 0 <1 0 <01
(1) VOCs were resampled because laboratory missed holding
NA = not analyzed
NS = not sampled
Bold and red = highest concenbabon since monfaonng started
Bold and blue = lowest concenbabon since monfaonng started
Shaded indicates concentrafaons exceeding GWQS
Bold and italics indicates ttie MDL exceeded ttie GWQS
1 st Qfa- = January - March
2nd Qfa- = /\pnl - June
3rd Qfa- = July - September
4tti Qfa- = October - December
fame
TABLE 1
Historic Summary Of Monitoring Parameters Up To The 2nd Quarter 2012
Chloroform Contamination Investigation
DUSAWhite Mesa Mill
Well Parameter
Sampling Event GWQS
Carbon Tetrachloride Chlonde
(mg/L)
Chloroform Chloromethane Methylene Chlonde Nitrate, Nitrate •<• Nitnte
(5 pg/L) No GWQS (70 pg/L) (30 pg/L) (5 pg/L) (10 mg/L)
TW4-24
2nd Qb-6/27/07 <1 0 770 26 <1 0 <1 0 26 1
3rd Qfa-8/15/07 <1 0 791 22 <1 0 <1 0 29
4tti 0^10/10/07 <1 0 692 1 5 <1 0 <1 0 24 7
IstQb-3/28/08 <1 0 740 1 5 <1 0 <1 0 24 4
2nd Qb-6/25/08 <1 0 834 1 4 <1 0 <1 0 45 3
3rd Qfa-9/10/08 <1 0 1180 29 <1 0 <1 0 38 4
4tti Qfa-10/15/08 NA 1130 NA NA NA 44 8
4tti Qfa-11/18/09 <2 0 NA <2 0 <2 0 <2 0 NA
1st Qfa-3/4/09 <1 0 1010 1 4 <1 0 <1 0 "~30 5
2nd Qfa-6/23/09 <1 0 759 1 5 <1 0 <1 0 30 4
3rd Qfa-9/14/09 <1 0 618 1 4 <1 0 <1 0 30 7
4tti Qb-12/16/09 <1 0 1080 1 2 <1 0 <1 0 28 3
1st Qfa-2/25/10 <1 0 896 1 3 <1 0 <1 0 331
2nd Qfa-6/14/10 <1 0 639 1 7 <1 0 <1 0 30
3rd Qfa-8/24/10 <1 0 587 1 8 <1 0 <1 0 ., 4tti Qfa-10/15/10 <1 0 522 1 4 <1 0 <1 0 31
1st Qfa-2/17/11 <1 0 " 1100 1 8 <1 0 <1 0 31
2nd Qfa-5/26/11 <1 0 1110 1 1 <1 0 <1 0 35
3rd Qfa-8/17/11 <1 0 967 1 7 <1 0 <1 0 34
4tti Qfa-11/16/11 608 35
12/7/11 <1 0 1 2 <1 0 <1 0
1st Qfa-1/16/12 <1 0 373 <1 0 <1 0 <1 0 37
2nd Qfa-6/6/12 <1 0 355 <1 0 <1 0 <1 0 37
TW4-25
2nd Qfa-6/27/07 <1 0 395 <1 0 <1 0 <1 0 171
3rd Qfa-8/15/07 <1 0 382 22 <1 0 <1 0 29
4tti Qb-10/10/07 <1 0 358 <1 0 <1 0 <1 0 17
1st Qfa-3/28/08 <1 0 374 <1 0 <1 0 <1 0 18 7
2nd Qfa-6/25/08 <1 0 344 <i"o <1 0 <1 0 221
3rd Qfa-9/10/08 <1 0 333 <1 0 <1 0 <1 0 18 8
4tti Qfa-10/15/08 NA 366 NA NA NA 21 3
4tti Qfa-11/18/09 <2 0 NA <2 0 <2 0 <2 0 NA "
IsfQfa-3/4/09 <1 0 332 <1 0 <1 0 <1 0 " 153
2nd Qfa-6/23/09 <1 0 328 <1 0 <1 0 <1 0 153
3rd Qfa-9/14/09 <1 0 328 <1 0 <1 0 <1 0 33
4tti Qfa-12/14/09 <1 0 371 <1 0 <1 0 <1 0 14 2
1st Qfa-2/23/10 <1 0 296 <1 0 <1 0 <1 0 14 4
2nd Qfa-6/14/10 <1 0 306 <1 0 <1 0 <1 0 16
3rd Qb-8/10/10 <1 0 250 <1 0 <1 0 <1 0 14
4tti Qfa-10/15/10 <1 0 312 <1 0 <1 0 <1 0 15
1st Qtr 2/16/11 <1 0 315 1 8 <1 0 <1 0 15
2nd Qb-5/25/11 <1 0 321 <1 0 <1 0 <1 0 16
3rd Qb-8/16/11 <1 0 276 <1 0 <1 0 <1 0 16
4tti Qfa-11/15/11 <1 0 294 <1 0 <1 0 <1 0 16
1st Qfa-1/16/12 <1 0 304 <1 0 <1 0 <1 0 16
2nd Qb-5/31/12 <1 0 287 <1 0 <1 0 <1 0 16
TW4-26
2nd Qb-6/14/10 <1 0 33 13 <1 0 <1 0 79
3rd Qfar 8/24/10 <1 0 17 52 <1 0 <1 0 9
4ttiQb-10/15/10 <1 0 22 54 <1 0 <1 0 96
1st Qfa-2/16/11 <1 0 "30 2 <1 0 <1 0 i"o
2nd Qb-5/26/11 <1 0 15 29 <1 0 <1 0 10
3rd Qfa-8/17/11 <1 0 19 28 <1 0 <1 0 11
4ttiQb-11/16/11 26 10
12/7/11 <1 0 52 <1 0 <1 0
IstQb-1/18/12" <10 " 17 7 <1 0 " <1 0 11
2nd Qb-6/6/12 <1 0 19 41 <1 0 <1 0 12
TW4-27
IstQb-1/18/12 <1 0 11 9l<1 0 <1 0 24
2nd Qb-6/13/12 <1 0 17 <1 0 <10 <1 0 41
TW4-6S (Duplicate Sample of MW-32)
2nd Qb-6/22/12 |<1 0 31|<1 0 |<1 0 |<1 0 |<0 1
TW4-70 (Duplicate Sample of TW4-11)
2ndQb-6/13/12 |<10 52 680 <10 |<1 0 72
NA = not analyzed
NS - not sampled
Shaded indicates concenfaafaons exceeding GWQS
Bold and italics indicates ttie MDL exceeded ttie GWQS
1st Qfa- = January - March
2nd Cttr = Apnl - June
3rd Qfa- = July - September
4th Qfa- = October - December
Table 2
Summary of QA/QC Samples
2nd Quarter 2012
Parameter GWQS Parameter GWQS Dup icate of MW-32 Duplicate of TW4-11 Parameter GWQS
,MW-32 TW4-65 RPD TW4-11 TW4-70 RPD
Nitrate + Nitrite (as N) 10 mg/L <0 1 <0 1 nc 67 72 -7 2
Chloride none 32 31 32 52 52 00
Chloroform 70 Mg/L <1 0 <1 0 nc 660 680 -3 0
Carbon tetrachloride 5|jg/L <1 0 <1 0 nc <10 <1 0 nc
Chloromethane 30 Mg/L <10 <1 0 nc <10 <1 0 nc
Methylene Chlonde 5Mg/L <1 0 <1 0 nc <1 0 <1 0 nc
nc = not calculated
Tabel 3
Chloroform Mass Removal Calculations
DUSAWhite Mesa Mill, Bland, Utah
2nd Quarter 2012
DRC Mass Removal Calculations
Well ID MW4 MW-26 TW4-4 TW4-19 TW4-20
Ave Chloroform (ug/L) 1,400 3.000 1.500 460 36.000
Chloroform (g/L) 1 40E-03 3 OOE-03 1 50E-03 4 60E-04 3 60E-02
Chloroform (Ibs/L) 3 09E-06 6 63E-06 3 31 E-06 1 02E-06 7 95E-05
Chloroform (lbs/gal) 1 17E-05 2 51 E-05 1 25E-05 3 85E-06 3 01 E-04
Total gallons pumped 2nd qtr 2012 90.916 26.701 87.759 172.082 22.956
lbs of chloroform removed 1 1 07 1 1 07 69
Gallons of chlorofonn removed 01 0 1 01 0 1 06
total lbs of chloroform removed 104
total gallons of chloroform removed 08