DRC-2013-001148 - 0901a06880345589

State of Utah
GARY R HERBERT
Governor
GREG BELL
Lieutenant Governor
Department of
Environmental Quality
Amanda Smith
Executive Director
DIVISION OF RADLATION CONTROL
Rusty Lundberg
Director
MEMORANDUM
TO
FROM
DATE
SUBJECT
Phil Goble
Dean Henderson
January 24,2013
i^i^lJ DRC.2013-00 1 148
Review of the 3rd Quarter 2012 Chloroform Monitonng 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 3rd Quarter 2012 Chloroform Monitonng
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 Discliarge 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 where sampled as requu-ed 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 (fonnerly TW4-17), TW4-26, and TW4-27
The following momtonng 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
195 North 1950 West • Salt Lake City, UT
Mailing Address P O Box 144850 • Salt Lake City, UT 84114-4850
Telephone [phone] • Fax [phone] 'TDD [phone]
www deq utah gov
Pnnted on 100% recycled paper
I5i
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 Phil Goble
FROM Dean Henderson
DATE January 24,2013
SUBJECT Review of the 3rd Quarter 2012 Chloroform Momtonng Report for the Chloroform
Contaminabon Investigabon, Energy Fuels Resources (USA) Inc ("EFR") White Mesa
Uranium Mill, near Blandmg, Utah
The Division of Radiation Control ("DRC") has reviewed the 3rd Quarter^Chloroform Momtonng Report
("Report") for the Chloroform Contamination Invesbgabon 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
8,200^1ast revised on August 24,2012
• The"©SSQuality Assurance Plan ("QAP") June 7,2012 (Revision 7 2)
REVIEW
Monitor Well Sampling
The following monitor wells where sampled as required 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 (fonnerly TW 4-15), MW-32 (fonnerly TW4-17), TW4-26, and TW4-27
The following monitonng wells were purged usmg 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
195 North 1950 West • Salt Lake City, UT
Mailing Address P O Box 144850 • Salt Lake City, UT 84114-4850
Telephone [phone] • Fax [phone] -TDD (801) 536^14
www deq utah gov
Pnnted on 100% recycled paper
Page 2
2 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,
andTW4-27
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 Nitnte as
Nitrogen Use of analytical methods is consistent with the requirements of the QAP requirements
QAQC
Holding Times
The method holding bmes for each parameter for samples collected at each monitor well were received and
analyzed within the required holding times in the QAP However, one of the three tnp blank samples
exceeded holding times for the VOC analysis EFR addressed this issue with problem with the following
corrective action
"Identification and Defimtion of the Problem
The Trip Blank sample collected on 9/10/2012 was analyzed by the laboratory outside of the required
holding time In a review of the data, EFR determined the Trip Blank was received by the laboratory
on 9/14/2012 and not analyzed until 9/26/2012, which resulted in the data being outside the required
holding time
Determination of a Corrective Action to Eliminate the Problem
The Trip Blank sample, which was analyzed outside of required holding time, was a result of a
laboratory error The samples were received with more than sufficient time to analyze all samples
within the required holding time EFR has determined this issue is due to laboratory error and not due
to any actions or inactions by EFR As discussed above, EFR has initiated contract negotiations with
an alternate Utah certified analytical laboratory and expects to make the change for the 1st quarter
2012 sampling event
Assisnins and Accepting Responsibility for Implementins the Corrective Action
Trip Blank Holding Times will be the responsibility of the QA manager to review data from the
alternate Utah certified laboratory to assure completion of analysis within the method specified
holding times
Implementing the Corrective Action and Evaluatin2 Effectiveness
EFR has contacted the current laboratory to make them aware of the issues In addition, EFR has
initiated the process to find and change analytical laboratories The change to a new analytical
laboratory is expected to occur pnor to the 1st quarter 2013 sampling event Once a new laboratory is
identified, the sample receipt data will be assessed as samples are received at the new laboratory to
determine if any further action is necessary
Verifvins That the Corrective Action Has Eliminated the Problem
Verification that samples are analyzed within the required holding times, will occur during the
assessment of data collected from the first quarter 2013 sampling event "
Page 3
DRC accepts EFR corrective action samples for exceeding holding times and no further action is required
at this bme
Receipt Temperature
All samples were received withm 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 2
duplicates) 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 TW4-65 and TW4-25 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 m the following wells and/or piezometers, as required in Part IE 3 of
the Permit
• The quarterly groundwater compliance monitonng wells
• Existing monitonng well MW-4 and all of the temporary chloroform investigation
wells
• Piezometers P-1, P-2, P-3, P-4 and P-5
•MW-20andMW-22
• Nitrate monitonng wells
• The DR piezometers which were installed dunng 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
Mass Removed
Chloroform removal was first estimated from the first quarter 2007 Since that esbmation the mass
removed by each pumping well for each quarter has been calculated Esbmated mass removed in 3rd
quarter 2012 is 6 6 lbs (see Table 3 below)
Reporting
The Report included the followmg information as required m the QAP
a) Introduction
b) Sampling and Monitonng Plan
-Descnption of monitor wells
-Descnption of sampling methodology, equipment and decontammabon procedures
-Identify all quality assurance samples, e g tnp blanks, equipment blanks,
duplicate samples
c) Data Interpretabon
Page 5
Monitor Wells with Chloroform Concentrations of <70ug/L
There are nine monitor wells that have chloroform concentrabons of <70pg/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 rangmg between 29 and 38
pg/L for the last 10 monitonng events (see Table 1 below)
Pumping Wells Chloroform Concentrations
All four pumping wells exceed chloroform concentrations of 70pg/L Pumping wells MW-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 (10 pg/L) MW-32,
TW4-3, TW4-12, TW4-13, TW4-14, TW4-23, and TW4-25 (see Table 1 below)
Nitrate. Nitrate + Nitnte ("nitrate") Concentrations
Monitor wells TW4-20, TW4-21, TW4-22, TW4-24, and TW4-25 all exceed the nitrate GWQS of 10 mg/1
All of these nitrate exceedances for these wells appear to be a result a of nitrate contaminant plume up-
gradient of the chloroform contaminant plume This nitrate contaminant plume is imder investigation as
required by the January 2009 Stipulated Consent Agreement, UDEQ Docket No UGW-09-03
Dunng the review of this Report it was foimd that nitrate has exceeded its GWQS (10 mg/L) in well TW4-
12 in the 3"* quarter 2012 monitonng event (13 mg/1) and well TW4-27 exceeded nitrate GWQS m the last
three consecubve quarterly monitoring events (1st quarter 2012 = 24 mg/1, 2nd quarter 2012=41 mg/1, 3rd
quarter 2012= 37mg/l) These nitrate exceedances are not mentioned in the Report however, were noted in
secbon 4 2 3 of EFR 3rd quarter 2012 nitrate monitonng report with the following statement
Section 4 2 3
"Note that samples from chloroform monitoring well TW4-27 and TW 4-12 have measured nitrate
concentrations that are higher than 10 mg/L However, nitrate concentrations in these wells are
clearly separated from the nitrate/chloride plume at the Mill site by many wells that are below 10 mg/L
or are nondetect for nitrate, including but not limited to, TW4-3, TW4-9, TW4-10, TW4-23, MW-32
and TW4-16 Thus, nitrate in TW4-27 and TW4-12 appear to be isolated from the plume at the Mill
site, in the same way that the relatively small nitrate plumes at TWN-9 and TWN-17 are isolated from
the plume at the Mill site "
DRC staff agrees with EFR statement above with the exception that a further mvestigabon is necessary to
determine the source and extent of the nitrate contaminabon at TW4-12 and TW4-27 Therefore, EFR
must be required to submit a contammabon invesbgatibn plan to invesbgate nitrate exceeding the GWQS
for at and m the vicinity of wells TW4-12 and TW4-27
Page 4
-Interpretation of groundwater levels, gradients, and flow direcbons
Interpretabons will include a discussion on 1) A current site groundwater
contour map, 2) hydrographs to show groundwater elevation in each
monitor well over time, 3) depth to groundwater measured and
groundwater elevation firom each monitor well summanzed in a data table,
that includes histonc groundwater level data for each well, and 4) an
evaluation of the effecbveness of hydraulic capture of all contaminants of
concern
-Interpretation of all analytical results for each well, including a discussion
on 1) a current chloroform isoconcentration map with one of the
isoconcentration lines showing the 70 pg/L boundary, 2) graphs showmg
chloroform concentration trends in each well through time and, 3)
analybcal results for each well summanzed in a data table, that mcludes
histonc analytical results for each well
-Calculate chloroform mass removed by pumping wells Calculations
would mclude 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 fi-om
each pumping well for the quarter '
d) Conclusions and Recommendations
e) Electromc copy of all laboratory results for Chloroform Investigation
monitonng conducted dunng the quarter
f) Copies of DUSA field records, laboratory reports and chain of custody forms
Conclusions on Compliance with the Permit and QAP
The Report appeared to be m compliance with the Permit and QAP with the exception of a tnp blank
exceeding holding bmes for VOC analysis However, as stated above, DRC accepts EFR correcbve action
for samples exceeding holding times and no further acbon is required at this bme
Evaluation of the Chloroform Contaminate Plume and Its Associated Contaminants
Bounding Chloroform Plume
It appears that the chloroform contaminate plume and associated contaminants, carbon tetrachlonde,
chloromethane, and methylene chlonde is bound in all direcbons by wells that have a chloroform
concentrabon of <70 [ig/L (GWQS = 70 pg/L) Therefore, no addibonal wells, at this time, need to be
installed downgradient, across, or upgradient of the chloroform contaminate plume to demonstrate the
plume is bound withm a 70 pg/L isoconcentrabon line
Captunng 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 captunng groundwater with chloroform concentrabons exceeding 70 pg/L
Monitor Wells Exceeding Chloroform Concentrabons of 70ug/L
There are seven monitor wells exceeding chloroform concentrations of 70pg/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)
Page 6
References
Denison Mines (USA) Corp, June 7,2012 White Mesa Uranium Mill, Ground Water Monitonng Quality
Assurance Plan (Revision 7 2)
Denison Mines (USA) Corp, November 27, 2012, White Mesa Uranium Mill Chloroform Monitonng
Report 3"* Quarter (July through September 2012)
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 Correcbve Action Order, Docket No
UGW-20-01
TABLE 1
Historic Summary Of Monitoring Parameters Up To The 3rd Quarter 2012
Chloroforin Contamination Investigation
DUSA White Mesa Mill
Well
Sampling Event
Parameter
GWQS
Well
Sampling Event
Carbon Tetrachloride
(5 ug/L)
Chloride
(mg/L)
No GWQS
Chloroform
(70 ug/L)
Chloromethane
(30 pg/L)
Methylene Chloride
(5 pg/L)
Nitrate, Nitrate * Nitrite
(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 70
1st Qtr 3/9/06 <S0 49 3.100 <50 <50 60
2nd Qtr 6/14/06 <50 49 3.000 <50 <S0 60
3rd Qtr 7/20/06 <50 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 "l 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 1 800 <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 5 1
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
3rd Qtr 9/4/12 1 5 41 1.500 <1 0 <1 0 50
MW-4A(TW4-A)
1st Qtr 3/16/05 NA NA 3.700 NA NA 7 1
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 <S0 55 3,000 <50 <so 67
1st Qtr 3/9/06 <S0 53 3,700 <50 <so 58
2nd Qtr 6/14/06 <50 54 3,300 <50 <50 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 7 1
1st Qtr 2/28/07 1 9 60 2,500 <1 0 <1 0 7 1
Well at>andonded
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 <50 55 1,000 <50 <50 03
1st Qtr 3/9/06 <S0 52 1,100 <50 <50 02
2nd Qtr 6/14/06 <S0 52 830 <50 <50 02
3rd Qtr 7/20/06 <50 65 2,170 <50 <50 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 2,000 <1 0 14 06
1st 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 53 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 0 100 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 <1 0 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 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 29
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
3rd Qtr 9/4/12 <1 73 3 100 <1 31 26
(1) VOCs were resampled because laboratory missed holding
NA = not analyzed
NS = not sampled
Shaded indicates concentrataons exceeding GWQS
Bold and red = highest concentration since monfaonng started
Bold and blue = lowest concentration since montaonng started
Bold and italics indicates the MDL exceeded the GWQS
tme
TABLE 1
Historic Summary Of Momtonng Parameters Up To The 3rd Quarter 2012
Chloroform Contamination Investigation
DUSA White Mesa Mill
Well Parameter
Sampling Event GWQS
Carbon Tetrachloride Chloride 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)
MW-32 (former TW4-17)
1st Qtr 3/16/05 NA NA <1 0 NA NA <0 1
2nd Qtr 5/25/05 NA NA <1 0 NA NA <0 1
3rd Qtr 8/31/05 <1 0 NA <1 0 32 <1 0 <0 1
4th Qtr 12/7/05 <1 0 33 <1 0 <1 0 <1 0 <0 1
1st Qtr 3/9/06 <1 0 32 <1 0 <1 0 <1 0 <0 1
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 <1 0 <1 0 <1 0 <1 0
2nd Qtr 6/27/07 <1 0 32 <1 0 <1 0 <1 0 <1 0
3rd Qtr 8/15/07 <1 0 31 <1 0 <1 0 <1 0 <1 0
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 <1 0 < 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 0 <1 0 <1 0
4th Qtr 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 Qtr 6/23/09 <1 0 31 <1 0 <1 0 <1 0 <0 1
3rd Qtr 9/14/09 «:1 0 33 <1 0 <1 0 <1 0 <0 1
4th Qtr 12/16/09 <1 0 35 <1 0 <1 0 <1 0 <01
1st Qtr 2/17/10 <1 0 38 <1 0 <1 0 <1 0 <01
2nd Qtr 6/14/10 <1 0 32 <1 0 <1 0 <1 0 <0 1
3rd Qtr 8/16/10 <1 0 28 <1 0 <1 0 <1 0 <0 1
4th Qtr 10/15/10 <1 0 24 <1 0 <1 0 <1 0 <0 1
1st Qtr 2/23/11 <1 0 40 <1 0 <1 0 <1 0 <01
2nd Qtr 5/25/11 <1 0 31 <10 <1 0 <1 0 <0 1
3rd Qtr 8/16/11 <1 0 33 <1 0 <1 0 <1 0 <0 1
4th Qtr 11/16/11 32 <0 1
12/7/11 <1 0 <1 0 <1 0 <1 0
1st Qtr 1/18/12 <1 0 21 <1 0 <1 0 <1 0 <0 1
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 <0 1
TW4-1
1st Qtr 3/16/05 NA NA 2,700 NA NA 9 1
2nd Qtr 5/25/05 NA NA NA NA 106
3rd Qtr 8/31/05 <10 NA 2,900 <10 <10 "" " '9 is
4th Qtr 12/7/05 <50 52 2 400 <50 <so 97
1st Qtr 3/9/06 <50 49 2,700 <50 <so 94
2nd Qtr 6/14/06 <S0 48 2,200 <50 <50 96
3rd Qtr 7/20/06 <50 51 2,840 <S0 <50
4th Qtr 11/8/06 1 4 47 2,260 <1 0 <1 0 92
1st Qtr 2/28/07 1 2 47 1,900 <1 0 <1 0 89
2nd Qtr 6/27/07 1 4 45 1,900 <1 0 <1 0 9
3rd Qtr 8/15/07 1 3 43 2,300 <1 0 <1 0 84
4th Qtr 10/10/07 1 3 43 2,000 <1 0 <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 <1 0 <1 0 8 15
4th Qtr 10/15/08 1 3 41 1,700 <1 0 <1 0 93
1st Qtr 3/11/09 1 1 37 1,700 <1 0 <1 0 75
2nd Qtr 6/23/09 1 37 1,500 <1 0 <1 0 69
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 <1 0 <1 0 68
1st Qtr 3/3/10 <1 0 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 1,600 <1 0 <1 0 66
1st Qtr 2/24/11 <1 0 41 1,300 <1 0 <1 0 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 <1 0 <1 0 7 1
3rd Qtr 9/28/12 <1 0 39 <1 0 <1 0 50
(1) VOCs were resampled because laboratory missed holding t
NA = not analyzed
NS = not sampled
Shaded indicates concentrabons exceeding GWQS
Bold and red = highist concentraton since montonng started
Bold and blue = lowest concentration since montaonng started
Bold and italics indicates the MDL exceeded the GWQS
1st Qtr = January - March
2nd Qta- = Apnl - June
3rd Qb- = July - September
4th Qtr = October - December
TABLE 1
Historic Summary Of Monitoring Parameters Up To The 3rd Quarter 2012
Chloroform Contamination Investigation
DUSA White Mesa Mill
Well Parameter
Sampling Event GWQS
Carbon Tetrachloride Chlonde Chlorofonn 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)
TW4-2
1st Qtr 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
4th Qb-12/7/05 <50 56 3,500 <50 <S0 78
1 St Qb-3/9/06 <50 56 3,800 <50 <50 75
2nd Qb-6/14/06 <50 56 3,200 <50 <50 7 1
3rd Qb-7/20/06 <50 54 4,120 <50 <50 74
4th Qb-11/8/06 23 55 3,420 <1 0 <1 0 76
1 St Qb-2/28/07 1 8 54 2,300 <1 0 <10\ 73
2nd Qb-6/27/07 25 50 3,000 <1 0 <1 0 78
3rd Qb-8/15/07 22 49 340 (?) <1 0 <1 0 73
4th Qb-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 Qb-6/25/08 22 46 3,100 <1 0 <1 0 74
3rd Qb-9/10/08 24 42 2,800 <1 0 <1 0 7 1
4tfiQb-10/15/08 NA 47 NA NA NA 80
4th Qb-11/18/09 24 NA 3,200 <2 0 <2 0 NA
1st Qb-3/11/09 2 2 46 3,100 <1 0 <1 0 65
2nd Qb-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
4th Qb-12/29/09 2 46 1,600 <1 0 <1 0 64
1st Qb-3/3/10 2 42 2,600 <1 0 <1 0 68
2nd Qb-6/14/10 26 43 3,300 <1 0 <1 0 87
3njQb-8/18/10 25 43 3,300 <1 0 <1 0 66
4fhQb-10/15/10 21 41 3,000 <1 0 <1 0 65
1st Qtr 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 Qb-8/17/11 1 6 48 2.400 <1 0 <1 0 60
4th Qb-11/29/11 28 49 3.900 <1 0 <1 0 70
1st Qb-1/24/12 2 49 2.500 <1 0 <1 0 7 1
2nd Qb-6/14/12 21 52 2.500 <1 0 <1 0 77
3rd Qb-9/28/12 1 8 76 2 900 <1 0 <1 0 40
TW4-3
1st Qb-3/16/05 NA NA <1 0 NA NA 35
2nd Qb-5/25/05 NA NA <1 0 NA NA 37
3rd Qb-8/31/05 <1 0 NA <1 0 64 <1 0 35
4tti Qb-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 Qb-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
1st Qb-2/28/07 <1 0 22 <1 0 <1 0 <1 0 31
2nd Qb-6/27/07 <1 0 23 <1 0 <1 0 <1 0 33
3rd Qtr 8/15/07 <1 0 24 <1 0 <1 0 <1 0 31
4th Qb-10/10/07 <1 0 27 <1 0 <1 0 <1 0 28
1 St Qb-3/28/08 <1 0 21 <1 0 <1 0 <1 0 28
2nd Qb-6/25/08 <1 0 19 <1 0 <1 0 <1 0 29
3rd Qb-9/10/08 <1 0 19 <1 0 <1 0 <1 0 27
4th Qb-10/15/08 <1 0 22 <1 0 <1 0 <1 0 26
1st Qb-3/4/09 <1 0 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 Qb-12/29/09 <1 0 22 <1 0 <1 0 <1 0 26
1 St Qb-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 3 1
4ttiQb-10/15/10 <1 0 26 <1 0 <1 0 <1 0 33
1st Qb-2/15/11 <1 0 23 <1 0 <1 0 <1 0 35
2nd Qb-5/25/11 <1 0 23 <1 0 <1 0 <1 0 37
3rd Qb-8/16/11 <1 0 23 <1 0 <1 0 <1 0 40
4th Qb-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 Qb-5/31/12 <1 0 24 <1 0 <1 0 <1 0 44
3rd Qb-8/29/12 <1 0 25 <1 0 <1 0 <1 0 49
NA = not analyzed
NS = not sampled
Shaded indicates concenbabons exceeding GWQS
Bold and red = highist concentrabon since montaonng started
Bold and blue = lowest concentaataon since montaonng started
Bold and italics indicates the MDL exceeded the GWQS
1st Qta- = January - March
2nd Qta- = Apnl - June
3rd Qb- = July - September
4th Qta- = October - December
TABLE 1
Histonc Summary Of Monitoring Parameters Up To The 3rd Quarter 2012
Chloroform Contamination Investigation
DUSA White Mesa Mill
Parameter
GWQS
Carbon Tetrachloride Chloride 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 3,100 NA NA 10 0
NA NA 2,400 NA NA 11 3
<10 NA <10 <10 9 9
<S0 54 2,800 <50 <S0 10 2
<so 51 2.900 <50 <50 95
<50 48 2.600 <50 <50 86
<S0 50 2,850 <50 <50 97
1 7 49 2,670 <1 0 <1 0 10 1
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 0 108
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 0 102
1 2 34 1,800 <1 0 <1 0 82
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 1,700 <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 7 1
<1 0 43 1,500 <1 0 <1 0 7 1
1 2 39 1 600 <1 0 <1 0 7 1
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 3 1 <2 5 60
<2 5 51 51 31 <2 5 59
<1 0 54 53 7 <1 0 <1 0 67
<1 0 55 47 1 <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
<1 0 36 ll" <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
<10 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
<1 0 79 <1 0 <1 0
<1 0 22 7S <1 0 <1 0 58
<10 39 84 <1 0 <1 0 80
<1 0 37 12 <1 0 <1 0 8 1
Well
Sampling Event
TW4-4
1st Qb-3/16/05
2nd Qb- 5/25/05
3rd Qb-8/31/05
4Ui Qb-12/7/05
1st Qtr 3/9/06
2nd Qb-6/14/06
3rd Qta-7/20/06
4th Qta-11/8/06
1st Qb-2/28/07
2nd Qta-6/27/07
3rd Qb-8/15/07
4ttn Qta-10/10/07
1st Qta-3/28/08
2nd Qb-6/25/08
3rd Qta-9/10/08
4tti Qta-10/15/08
4th Qta-11/18/09
1st Qb-3/4/09
2nd Qb-6/23/09
3rd Qta-9/14/09
4tti Qta-12/29/09
1st Qta-2/17/10
2nd Qb-6/14/10
3rd Qb-8/10/10
4th Qta-10/15/10
1st Qb-2/23/11
2nd Qb-6/1/11
3rd Qb-8/17/11
4ttiQb-11/16/11
1st Qta-1/23/12
2nd Qta-6/6/12
3rd Qta-9/4/12
TW4-5
1st Qtr 3/16/05
2nd Qb-5/25/05
3rd Qb-8/31/05
4th Qb-12/7/05
1 St Qb-3/9/06
2nd Qb-6/14/06
3rd Qta-7/20/06
4tti Qta-11/8/06
1st Qta-2/28/07
2nd Qta-6/27/07
3rd Qb-8/15/07
4th Qb-10/10/07
1st Qb-3/28/08
2nd Qb- 6/25/08
3rd Qta-9/10/08
4th Qta-10/15/08
1st Qb-3/4/09
2nd Qta-6/23/09
3rd Qb- 9/14/09
4th Qb-12/29/09
1st Qta-2/25/10
2nd Qta-6/14/10
3rd Qta-8/11/10
4tti Qta-10/15/10
1st Qb-2/22/11
2nd Qb-5/26/11
3rd Qb-8/7/11
4ttnQb-11/16/11
'^'12/7/11
1st Qtr 1/18/12
2nd Qb-6/6/12
3rd Qta-9/11/12
(1) VOCs were resampled because laboratory missed holding
NA = not analyzed
NS = not sampled
Bold and red = highist concenbabon since montaonng started
Bold and blue = lowest concentrataon since montaonng started
Shaded indicates concenbabons exceeding GWQS
Bold and italics indicates the MDL exceeded the GWQS
1st Qtar = January - March
2nd Qb- = Apnl - June
3rd Qb- = July - September
4th Qb- = October - December
tame
TABLE 1
Histonc Summary Of Monitoring Parameters Up To The 3rd Quarter 2012
Chloroform Contamination Investigation
DUSA White Mesa Mill
Well Parameter
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)
TW4-6
1st Qtar 3/16/05 NA" NA <1 0 NA NA 02
2nd Qb-5/25/05 NA NA 25 NA NA 04
3rd Qb-8/31/05 <1 0 NA 10 28 <1 0 08
4th Qb-12/7/05 <1 0 32 17 1 3 <1 0 09
1st Qb-3/9/06 <1 0 31 31 <1 0 <1 0 1 2
2nd Qb-6/14/06 <1 0 30 19 <1 0 <1 0 1 0
3njQb-7/20/06 <1 0 37 11 <1 0 <1 0 06
4ttiQb-11/8/06 <1 0 65 42 8 <1 0 <1 0 1 4
1st Qta-2/28/07 <1 0 32 46 <1 0 <1 0 1 8
2nd Qta-6/27/07 <1 0 38 11 <1 0 <1 0 06
3rd Qtr 8/15/07 <1 0 36 18 <1 0 <1 0 07
4th Qta-10/10/07 <1 0 35 18 <1 0 <1 0 08
1st Qb-3/28/08 <1 0 33 52 <1 0 <1 0 1 1
2nd Qta- 6/25/08 <1 0 35 24 <1 0 <1 0 09
3njQb-9/10/08 <1 0 35 39 <1 0 <1 0 1 1
4th Qb-10/15/08 <1 0 33 37 <1 0 <1 0 1 0
1st Qta-3/11/09 <1 0 " 35 81 <1 0 <1 0 22
2nd Qta-6/23/09 <1 0 37 120 <1 0 <1 0 27
3rd Qta- 9/14/09 <1 0 37 280 <1 0 <1 0 50
4th Qta-12/29/09 <1 0 41 250 <1 0 <1 0 61
1st Qb-2/25/10 <1 0 45 <1 0 <1 0 1 8
2nd Qta-6/14/10 <1 0 33 590 <1 0 <1 0 25
3rd Qb-8/11/10 <1 0 31 630 <1 0 <1 0 39
4th Qb-10/15/10 <1 0 41 420 <1 0 <1 0 43
1st Qta-2/23/11 <1 0 40 47 <1 0 <1 0 07
2nd Qb- 5/26/11 <1 0 42 96 <1 0 <1 0 03
3rd Qta-8/17/11 <1 0 39 16 <1 0 <1 0 03
4th Qta-11/16/11 36 08
'^'12/7/11 <1 0 21 <1 0 <1 0
'^'11/16/11 <1 0 33 50 <1 0 <1 0 08
1st Qb-1/18/12 <1 0 38 38 <1 0 <1 0 07
2nd Qb-6/13/12 <1 0 40 47 <1 0 <1 0 02
3rd Qtar 9/11/12 <1 0 21 SS <1 0 <1 0 0 1
TW4-7
1 St Qb-3/16/05 NA NA NA NA 52
2nd Qb-5/25/05 NA NA 2,700 NA NA 54
3rd Qtr 8/31/05 <10 NA <10 <10 52
4th Qb-12/7/05 <50 52 2,500 <50 <50 53
1st Qta-3/9/06 <50 48 1,900 <50 <S0 1
2nd Qta-6/14/06 <50 47 2,200 <50 <S0 45
3rd Qb-7/20/06 <50 51 2,140 <50 <50 47
4th Qb-11/8/06 1 5 49 2,160 <1 0 <1 0 46
1st Qb-2/28/07 1 1 47 1,830 <1 0 <1 0 6
2nd Qb-6/27/07 1 5 45 2,600 <1 0 <1 0 51
3rd Qta-8/15/07 1 4 44 2,300 <1 0 <1 0 47
4tti Qb-10/10/07 1 2 45 1,900 <1 0 <1 0 47
1 St Qb-3/28/08 1 3 43 2,200 <1 0 <1 0 42
2nd Qta-6/25/08 1 3 43 1,800 <1 0 <1 0 48
3rd Qta-9/10/08 1 4 35 1.600 <1 0 <1 0 4 16
4th Qta-10/15/08 NA 40 NA NA NA 4 01
4th Qb-11/18/09 <2 0 NA 2,500 <2 0 <2 0 NA
1 St Qb-3/11/09 1 2 35 1,800 <1 0 <1 0 37
2nd Qb-6/23/09 <1 0 37 1 400 <1 0 <1 0 38
3rd Qta-9/14/09 1 37 1,500 <1 0 <1 0 4 1
4th Qta-12/29/09 <1 0 37 1,300 <1 0 <1 0 42
1st Qta-3/3/10 <1 0 35 1,200 <1 0 <1 0 38
2nd Qta-6/14/10 <1 0 31 1,100 <1 0 <1 0 39
3rd Qb-8/11/10 1 36 1,500 <1 0 <1 0 39
4th Qb-10/15/10 <1 0 38 1,100 <1 0 <1 0 4
IstQb-2/23/11 <1 0 45 1,300 <1 0 <1 0 36
2nd Qta-6/1/II <1 0 35 1,200 <1 0 <1 0 40
3rd Qta-8/18/11 <1 0 37 1,200 <1 0 <1 0 4 1
4th Qtr 11/29/11 <1 0 37 1,000 <1 0 <1 0 38
1st Qta-1/19/12 <1 0 37 1,000 <1 0 <1 0 39
2nd Qtr 6/14/12 <1 0 41 r <1 0 <1 0 40
3nj Qta-9/13/12 <1 0 40 870 <1 0 <1 0 38
(1) VOCs were resampled because laboratory missed holding
(2) Results of the TW4-70 the duplicate sample for TW4-6
NA = not analyzed
NS = not sampled
Shaded indicates concentrataons exceeding GWQS
Bold and red = highest concentrataon since montaonng started
Bold and blue = lowest concentrataon since montaonng started
Bold and italics indicates the MDL exceeded the GWQS
1st Qta- = January - March
2nd Qta- = Apnl - June
3rd Qb- = July - September
4th Qta- = October - December
tame
TABLE 1
Histonc Summary Of Monitoring Parameters Up To The 3rd Quarter 2012
Chloroform Contamination Investigation
DUSA White Mesa Mill
Well Parameter
Sampling Event GWQS
Carbon Tetrachloride 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)
TW4-8
IstQb-3/16/05 NA NA 10 NA NA <0 1
2nd Qb-5/25/05 NA NA <1 0 NA NA 02
3rd Qfr 8/31/05 <1 0 NA 11 1 7 NA <1 0
4th Qb-12/7/05 <1 0 41 <1 0 <1 0 <1 0 <1 0
IstQb-3/9/06 <1 0 ' 39 13 2 1 <1 0 03
2nd Qb-6/14/06 <1 0 37 18 1 0 <1 0 <10"
3rd Qta-7/20/06 <1 0 39 <1 0 <1 0 <1 0 0 1
4th Qb-11/8/06 <1 0 40 <1 0 <1 0 <1 0 <1
1st Qtr 2/28/07 <1 0 39 25 <1 0 <1 0 07
2nd Qb-6/27/07 <1 0 42 25 <1 0 <1 0 02
3rd Qta-8/15/07 <1 0 42 1 5 <1 0 <1 0 <1 0
4tti Qta-10/10/07 <1 0 43 35 <1 0 <1 0 05
IstQb-3/28/08 <1 0 46 <i 6 <1 0 <1 0 0 1
2nd Qb-6/25/08 <1 0 45 <i 0 <1 0 <1 0 <1 0
3rd Qb-9/10/08 <1 0 39 <i 0 <1 0 <1 0 <0 05
4th Qb-10/15/08 <1 0 44 <i 0 <1 0 <1 0 <0 05
IstQb-3/4/09 <1 0 42 <10 <1 0 <1 0 <0 1
2nd Qb-6/23/09 <1 0 44 <i 0 <1 0 <1 0 <0 1
3rd Qta-9/14/09 <1 0 44 <i 0 <1 0 <1 0 <01
4th Qta-12/17/09" '" 51 <i 0"" <"i"o "<i"6" <o"i
1st Qta-2/24/10 <1 0 57 <i 0 <1 0 <i 0 <0 1
2nd Qta-6/14/10 <1 0 42 <i 0 <1 0 <i 0 <0 1
3rd Qb-8/18/10 <1 0 45 <i 0 <1 0 <i 0 <0 1
4th Qb-10/15/10 <1 0 46 <i 0 <1 0 <i 0 0 1
IstQb-2/16/11 <1 0 52 <i 0 <1 0 <i 0 <0 1
2nd Qb-5/25/11 <1 0 45 <i 0 <1 0 <i 0 0 1
3rd Qb-8/16/11 <1 0 46 <i 0 <1 0 <i 0 0 1
4th Qb-11/16/11 45 02
<''l2/7/11 <1 0 <i 0 <1 0 <i 0
IstQb-1/18/12 <1 0 45 <10 <1 0 <10 03
2nd Qb-5/13/12 <1 0 "44 <i 0 <1 0 <i 0 02
3rd Qb-8/29/12 <1 0 48 <i 0 <1 0 <i 0 0 1
TW4-9
1st Qta-3/16/05 NA NA 38 NA NA 1 3
2nd Qta-5/25/05 NA NA 1 2 NA NA 1 3
3rd Qb-8/31/05 <1 0 NA <i 0 29 <1 0 1 3
4th Qta-12/7/05 <1 0 42 <i 0 <1 0 <1 0 1 3
IstQb-3/9/06 <1 0 38 <i 0 2 6 <1 0 1 5
2nd Qta-6/14/06 <1 0 39 19 27 <i"o 1 5
3rd Qta-7/20/06 <1 0 41 <i 0 <1 0 <1 0 09
4th Qb-11/8/06 <1 0 44 <10 <1 0 <1 0 07
1st Qta-2/28/07 <1 0 44 <i 0 <1 0 <1 0 06
2nd Qb-6/27/07 <1 0 42 21 <1 0 <1 0 1 3
3rd Qta-8/15/07 <1 0 38 95 <1 0 <1 0 1 8
4th Qta-10/10/07 <1 0 40 87 <1 0 <1 0 2
IstQb-3/28/08 <1 0 35 1 3 <1 0 <1 0 21
2nd Qta-6/25/08 <1 0 35 1 <1 0 <1 0 23
3rd Qb-9/10/08 <1 0 28 <i 0 <1 0 <1 0 2 79
4th Qta-10/15/08 <1 0 58 <i 0 <1 0 <1 0 1 99
1st Qta-3/4/09 <1 0 30 <i 0 <1 0 <1 0 25
2nd Qb-6/23/09 <1 0 30 <i 0 <1 0 <1 0 23
3rd Qb-9/14/09 <1 0 30 <i 0 <1 0 <1 0 25
4th Qb-12/17/09 <1 0 37 <i 0 <1 0 <1 0 1 7
1st Qta-2/23/10 <1 0 47 <i 0 <1 0 <1 0 1 4
2nd Qta-6/14/10 <1 0 33 <i 0 <1 0 <1 0 1 5
3rd Qb-8/13/10 <1 0 40 <i 0 <1 0 <1 0 1 2
4th Qb-10/15/10 <1 0 34 <i 0 <1 0 <1 0 1 8
IstQb-2/17/11 <1 0 41 <i 0 <1 0 <1 0 1 3
2nd Qb-5/25/11 <1 0 38 <i 0 <1 0 <1 0 34
3rd Qta-8/16/11 <1 0 21 <i 0 <1 0 <1 0 4
4th Qb-11/16/11 38 23
(1)12/7/11 <1 0 <i 0 <1 0 <1 0
IstQb-1/18/12 <1 0 28 <i 0 <1 0 <1 0 23
2nd Qb-5/31/12 <1 0 23 <i 0 <1 0 <1 0 40
3rd Qta-8/30/12 <1 0 22 <i 0 <1 0 <1 0 39
(1) VOCs were resampled because laboratory missed holding tame
NA = not analyzed
NS = not sampled
Shaded indicates concenbataons exceeding GWQS
Bold and red = highest concentrabon since montaonng started
Bold and blue = lowest concentrabon since montaonng started
Bold and italics indicates the MDL exceeded the GWQS
1st Qb- = January - March
2nd Qb- = Apnl - June
3rd Qta- = July - September
4tti Qb- = October - December
TABLE 1
Historic Summary Of Monitoring Parameters Up To The 3rd 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)
(5 pg/L) No GWQS (70 pg/L) (30 pg/L) (5 pg/L) (10 mg/L)
TW4-10
1st Qta-3/16/05 NA NA 140 NA NA 1 6
2nd Qb-5/25/05 NA NA 62 4 NA NA 08
3rd Qb-8/31/05 <2 5 NA 110 62 <2 5 1 1
4th Qb-12/7/05 <2 5 52 300 <2 5 <2 5 3 3
IstQb-3/9/06 <5 0 50 190 <5 0 <5 0 24
2nd Qta- 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
4UiQb-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
3rtQb-8/15/07 <1 0 59 660 <1 0 <1 0 73
4th 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 Qb-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
4th Qb-10/15/08 NA 61 NA NA NA 105
4UnQb-11/18/09 <2 0 NA <2 0 <2 0 NA
1st Qta-3/11/09 <1 0 64 1,100 <1 0 <1 0 11 6
2nd Qb-6/23/09 <1 0 62 <1 0 <1 0 9 8
3rd Qta-9/14/09 <1 0 51 910 <1 0 <1 0 81
4ttlQb-12/22/09 <1 0 51 300 <1 0 <1 0 38
'1st Qta-3/3/10 <1 0 48 460 <1 0 <1 0 50
2nd Qb-6/14/10 <1 0 42 220 <1 0 <1 0 1 6
3rd Qta-8/12/10 <1 0 38 100 <1 0 <1 0 08
4th Qb-10/15/10 <1 0 52 1100 <1 0 <1 0 110
1st Qta-2/23/11 <1 0 32 620 <1 0 <ro 90
2nd Qta-6/14/11 <1 0 42 280 <1 0 <1 0 33
3rd Qta-8/17/11 <1 0 41 180 <1 0 <1 0 1 9
4tti Qta-11/16/11 <1 0 45 110 <1 0 <1 0 1 1
1st Qta-1/19/12 <1 0 40 r <1 0 <1 0 09
2nd Qta-6/14/11 <1 0 46 79 <1 0 <1 0 08
3rd Qta-9/12/12 <1 0 44 130 <1 0 <1 0 1 0
TW4-11
IstQb-3/16/05 NA NA 4,400 NA NA 87
2nd Qta-5/25/05 NA NA 3,590 NA NA 10 3
3rd Qb-8/31/05 <10 NA 4,400 <10 <10 94
4tti Qta-12/7/05 <100 58 4,400 <100 <100 94
1st Qta-3/9/06 <so 56 4,400 <50 <S0 92
2nd Qta-6/14/06 <50 56 4,300 <S0 <50 100
3rd Qta-7/20/06 <S0 55 4,080 <50 <S0 10 0
4th Qta-11/8/06 1 7 55 3,660 2 7 1 3 100
1st Qta-2/28/07 1 3 54' 3,600 <1 0 1 6 10 1
2nd Qta-6/27/07 1 6 53 3,800 <1 0 <1 0 106
3rd Qb-8/15/07 1 7 53 <1 0 <1 0 10 2
4th Qb-10/10/07 1 6 53 4,400 <1 0 1 2 9 8
IstQb-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
4th Qb-10/15/08 NA 47 NA NA NA 95
4ttiQb-11/18/09 <2 0 NA 1,000 <2 0 <2 0 NA
IstQb-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 Qta-9/14/09 <1 0 49 1,000 <1 0 <1 0 70
4tti Qta-12/29/09 <1 0 46 860 <1 0 <1 0 66
1st Qta-3/3/10 <1 0 42 820 <1 0 <1 0 68
2nd Qta-6/14/10 <1 0 40 820 <1 0 <1 0 69
3rd Qta-8/12/10 <1 0 43 800 <1 0 <1 0 67
4th Qta-10/15/10 <1 0 49 720 <1 0 <1 0 64
1st Qta-2/23/11 <i"o 46 1,000 <1 0 <1 0 65
2nd Qta-6/1/II <1 0 49 930 <1 0 <1 0 73
3rd Qb-8/17/11 <1 0 48 820 <1 0 <1 0 7 1
4th Qta-11/16/11 <1 0 46 1500 <1 0 <1 0 71
IstQb-1/24/12 <1 0 43 610 <1 0 <1 0 68
2nd Qta-6/13/12 <1 0 52 660 <1 0 <1 0 67
3rd Qb-9/13/12 <1 0 49 740 <1 0 <1 0 30
(1) VOCs were resampled because laboratory missed holding
NA = not analyzed
NS = not sampled
Shaded indicates concenbabons exceeding GWQS
Bold and red = highest concentrabon since montaonng started
Bold and blue = lowest concentrabon since montaonng started
Bold and italics indicates the MDL exceeded the GWQS
1st Qb- = January - March
2nd Qta- = Apnl - June
3rd Qtr = July - September
4th Qta- = October - December *
tame
TABLE 1
Histonc Summary Of Monitonng Parameters Up To The 3rd Quarter 2012
Chloroform Contamination Investigation
DUSA White Mesa Mill
Well Parameter
Sampling Event GWQS
Carbon Tetrachloride Chloride
(mg/L)
Chloroform Chloromethane Methylene Chloride Nitrate, Nitrate + Nitrite
(5 pg/L) No GWQS (70 pgrt.) (30 pg/L) (5 pg/L) (10 mg/L)
TW4-12
1st Qta-3/16/05 NA NA <1 0 NA NA 1 4
2nd Qta-5/25/05 NA NA <1 0 NA NA 1 6
3rd Qta-8/31/05 <1 0 NA <1 0 58 <1 0 1 5
4ttiQb-12/7/05 <1 0 19 <1 0 1 0 <1 0 1 4
1st Qta-3/9/06 <1 0 19 <1 0 26 <1 0 1 3
2nd Qta-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
4th Qta-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 Qb-8/15/07 <1 0 29 <1 0 <1 0 <1 0 1 4
4th Qb-10/10/07 <1 0 16 <1 0 <1 0 <1 0 1 4
IstQb-3/28/08 <1 0 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 Qta-9/10/08 <1 0 18 <1 0 <1 0 <1 0 27
4th Qtar 10/15/08 <1 0 22 <1 0 <1 0 <1 0 25
1st Qta-3/11/09 <1 0 23 <1 0 <1 0 <1 0 24
2nd Qta-6/23/09 <1 0 22 <1 0 <1 0 <1 0 38
3rd Qb-9/14/09 <1 0 22 <1 0 <1 0 <1 0 51
4th Qb-12/16/09 <1 0 23 <1 0 <1 0 <1 0 36
IstQb-2/23/10 <1 0 22 <1 0 <1 0 <1 0 40
2nd Qb-6/14/10 <1 0 29 <1 0 <1 0 <1 0 110
3rd Qb-8/10/10 <1 0 35 <1 0 <1 0 <1 0 90
4ttiQb-10/15/10 <1 0 31 <1 0 <1 0 <1 0 80
IstQb-2/15/11 <1 0 31 <1 0 <1 0 <1 0 65
2nd Qb-5/25/11 <1 0 32 <1 0 <1 0 <1 0 70
3rdQb-8/l"6/11 <1 0 31 <1 0 <1 0 <i'o 68
4th Qb-11/15/11 <1 0 30 <1 0 <1 0 <1 0 80
IstQb-1/17/12 <1 0 28 <1 0 <1 0 <1 0 77
2nd Qb-5/31/12 <1 0 34 <1 0 <1 0 <1 0 10 0
3rd Qta-8/29/12 <1 0 39 <1 0 <1 0 <1 0 13 0
TW4-13
1st Qta-3/16/05 NA NA <1 0 NA NA 42
2nd Qta-5/25/05 NA NA <1 0 NA NA 43
3rd Qb-8/31/05 <1 0 NA <1 0 31 <1 0 46
4th Qta-12/7/05 <1 0 69 <1 0 <1 0 <1 0 43
IstQb-3/9/06 <1 0 67 <1 0 1 i <1 0 42
2nd Qb-6/14/06 <1 0 66 <1 0 1 4 <1 0 49
3rd Qb-7/20/06 <1 0 65 <1 0 <1 0 <1 0 43
4th Qb-11/8/06 <1 0 33 <1 0 <1 0 <1 0 08
1st Qta-2/28/07 <1 0 59 <1 0 <1 0 <1 0 40
2nd Qb-6/27/07 <1 0 59 <1 0 <1 0 <1 0 46
3rd Qta-8/15/07 <1 0 58 <1 0 <1 0 <1 0 44
4th Qb-10/10/07 <1 0 58 <1 0 <1 0 <1 0 4 1
IstQb-3/28/08 <1 0 54 <1 0 <1 0 <1 0 38
2nd Qta-6/25/08 <1 0 58 <1 0 <1 0 <1 0 42
3nlQb-9/10/08 <1 0 50 <1 0 <1 0 <1 0 43
4th Qb-10/15/08 <1 0 58 <1 0 <1 0 <1 0 46
IstQb-3/4/09 <1 0 58 <1 0 <1 0 <1 0 37
2nd Qta- 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
4th Qb-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 Qb-6/14/10 <1 0 53 <1 0 <1 0 <1 0 52
3rd Qta-8/10/10 <1 0 55 <1 0 <1 0 <1 0 56
4tti Qta-10/15/10 <1 0 55 <1 0 <1 0 <1 0 58
1st Qta-2/15/11 <1 0 60 <1 0 <1 0 <1 0 55
2nd Qta-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
4th Qb-11/15/11 "<1 0 54 <1 0 <1 0 <1 0 59
1st Qta-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
3rd Qb-8/29/12 <1 0 60 <1 0 <1 0 <'l 0 62
NA = not analyzed
NS = not sampled
Shaded indicates concenbabons exceeding GWQS
Bold and italics indicates the MDL exceeded ttie GWQS
1st Qb- = January - March
2nd Qb- = Apnl - June
3rd Qta- = July - September
4th Qb- = October - December
TABLE 1
Histonc Summary Of Monitonng Parameters Up To The 3rd Quarter 2012
Chlorofonm Contamination Investigation
DUSA White Mesa Mill
Well Parameter
GWQS
Carbon Tetrachloride Chlonde Chloroform Chloromethane Methylene Chlonde Nitrate, Nitrate + Nitnte
{mgiL)
(5 pg/L) No GWQS (70 pg/L) (30 pg/L) (5 pg/L) (10 mg/L)
TW4-14
1st Qta-3/16/05 NS NS NS NS NS NS
2nd Qta-5/25/05 NS NS NS NS NS NS
3rd Qb-8/31/05 NS NS NS NS NS NS
4th Qta-12/7/05 NS NS NS NS NS NS
IstQb-3/9/06 NS NS NS NS NS NS
2nd Qb-6/14/06 NS NS NS NS NS NS
3rd Qta-7/20/06 NS NS NS NS NS NS
4th Qb-11/8/06 «;l 0 37 NS <1 0 <1 0 24
1st Qta-2/28/07 <1 0 38 <1 0 <1 0 <1 0 23
2nd Qta-6/27/07 <1 0 38 <1 0 <1 0 <1 0 1 4
3rd Qb-8/15/07 <1 0 36 <1 0 <1 0 <1 0 1 1
4th Qta-10/10/07 <1 0 38 <1 0 <1 0 <1 0 08
IstQb-3/28/08 <1 0 57 <1 0 <1 0 <1 0 04
2nd Qta-6/25/08 <1 0 35 <1 0 <1 0 <1 0 1 6
3rd Qb-9/10/08 <1 0 34 <1 0 <1 0 <1 0 1 38
4ttiQb-10/15/08 <1 0 40 <1 0 <1 0 <1 0 0 76
IstQb-3/4/09 <1 0 35 <1 0 <1 0 <1 0 1 6
2nd Qb-6/23/09 <1 0 36 <1 0 <1 0 <1 0 1 4
3rd Qta-9/14/09 <1 0 38 <1 0 <1 0 <1 0 1 5
4th Qta-12/16/09 <1 0 34 <1 0 <1 0 <1 0 1 4
1st Qta-3/3/10 <1 0 33 <1 0 <1 0 <1 0 25
2nd Qta-6/14/10 <1 0 49 <1 0 <1 0 <1 0 29
3rd Qb-8/10/10 <1 0 35 <1 0 <1 0 <1 0 28
4ttiQb-10/15/10 <1 0 29 <1 0 > <1 0 <1 0 29
IstQb-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 Qb-8/16/11 <1 0 33 <1 0 <1 0 <1 0 26
4th Qb-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 Qta-6/14/11 <1 0 35 <1 0 <1 0 <10 33
3rd Qb-8/29/12 <1 0 37 <1 0 <1 0 <1 0 39
TW4-16
IstQb-3/16/05 NA NA 240 NA NA <0 1
2nd Qb-5/25/05 NA NA 212 NA NA <01
3rd Qta-8/31/05 <1 0 NA 85 32 43 <0 1
4tti Qta-12/7/05 <i"o 64 26 59 1 4
IstQb-3/9/06 <1 0 " 60 39 1 1 21 3
2nd Qb-6/14/06 <1 0 55 13 24 89 1 9
3rd Qb-7/20/06 <i"o 60 52 <1 0 27 27
4th Qb-11/8/06 <1 0 62 136 <1 0 92 56
1st Qtr 2/28/07 <1 0 79 87 <1 0 66 123
2nd Qta-6/27/07 <1 0 75 26 <1 0 "l 8 " 9 9
3rd Qb-8/15/07 <1 0 65 7 1 <1 0 5 1 54
4th Qta-10/10/07 <1 0 69 1 4 <1 0 i 44
IstQb-3/28/08 <1 0 52 11 <1 0 26 <01
2nd Qb-6/25/08 <1 0 58 <1 0 <1 0 <i 6 " 1 5
3rd Qb-9/10/08 <1 0 71 10 <1 0 14 105
4ttiQb-10/15/08 <1 0 89 39 <1 0 66 "9'8
IstQb-3/4/09 <1 0 73 <1 0 <1 0 <1 0 96
2nd Qta-6/23/09 <1 0 76 <1 0 <1 0 <1 0 89
3rd Qta-9/14/09 <1 0 79 <1 0 <1 0 <1 0 88
4th Qta-12/17/09 <1 0 76 <1 0 <1 0 <1 0 52
1st Qtar 2/24/10 <1 0 77 <1 0 <1 0 <1 0 42
2nd Qb-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
4ttiQb-10/15/10 <1 0 71 3 <1 0 <1 0 33
1st Qta-2/22/11 <1 0 86 15 <1 0 <1 0 7
2nd Qb-5/26/11 <1 0 81 16 <i o' <1 0 5
3rd Qb-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
1st Qta-1/18/12 <1 0 48 <1 0 <1 0 1 7 01
2nd Qb-5/26/11 <1 0 53 <1 0 <1 0 <1 0 <0 1
3rd Qta-8/30/12 <1 0 59 <1 0 <1 0 <1 0 <0 1
(1) VOCs were resampled because laboratory missed holding tame
NA = not analyzed
NS - not sampled
Bold and red = highest concentrataon since montaonng started
Bold and blue = lowest concentrataon since montaonng started
Shaded indicates concenbataons exceeding GWQS
Bold and italics indicates ttie MDL exceeded ttie GWQS
1st Qta- = January - March
2nd Qta- = Apnl - June
3rd Qb- = July - September
4tti Qb- = October - December
TABLE 1
Historic Summary Of Monitonng Parameters Up To The 3rd Quarter 2012
Chloroform Contamination Investigation
DUSA White Mesa Mill
Parameter
GWQS
Carbon Tetrachloride 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 molL)
NA NA 38 NA NA 14 1
NA NA 29 8 NA NA 129
<1 0 NA 39 28 <1 0 133
<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 92 <1 0 <1 0 5 1
<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 07
<1 0 23 57 <1 0 <1 0 46
<1 0 26 8 <1 0 s <1 0 49
<1 0 30 94 <1 0 <1 0 52
<1 0 29 11 <1 0 <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
<1 0 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 0 100
<1 0 52 39 <1 0 <1 0 100
<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
<1 0 26 38 <1 0 <1 0 66
NA NA 2,200 NA NA 53
NA NA 1,200 NA NA 57
<5 0 NA 1,400 <5 0 <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 <1 0 <1 0 <0 1
16 124 4,700 <1 0 <1 0 267
1 3 144 840 <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 1,200 <1 0 <1 0 27
17 135 3,400 <1 0 <1 0 17 0
83 148 4,000 <1 0 <1 0 120
21 148
148
970 <1 0 <1 0 30
50
54 2,200 <1 0 <1 0
1 5 138 650 <1 0 <1 0 06
1 1 149 460 <1 0 <1 0 24
35 149 950 <1 0 <1 0 25
[Well
Sampling Event
TW4-18
1st Qta-3/16/05
2nd Qta-5/25/05
3rd Qta-8/31/05
4tti Qta-12/7/05
IstQb-3/9/06
2nd Qb-6/14/06
3rd Qb-7/20/06
4ttiQb-11/8/06
IstQb-2/28/07
2nd Qta-6/27/07
3rd Qta-8/15/07 "
4ttiQb-10/10/07
1st Qtr 3/28/08
2nd Qta-6/25/08
3rd Qb-9/10/08
4tti Qta-10/15/08
IstQb-3/4/09
2nd Qta-6/23/09
3rd Qb-9/14/09
4tti Qb-12/22/09
IstQb-2/24/10
2nd Qb-6/14/10
3rd Qta-8/12/10
4ttiQb-10/15/10
1st Qta-2/22/11
2nd Qb-5/26/11
3rd Qb-8/17/11
4tti Qta-11/16/11
12/7/11
1st Qtr 1/18/12
2nd Qb-6/13/12
3rd Qta-9/11/12
TW4-19
1st Qta-3/16/05
2nd Qta-5/25/05
3rd Qb- 8/31/05
4ttiQb-12/7/05
1st Qta-3/9/06
2nd Qta-6/14/06
3rd Qta-7/20/06
4tti Qta-11/8/06
IstQb-2/28/07
2nd Qta-6/27/07
3Rj Qta-8/15/07
4ttiQb-10/10/07
IstQb-3/28/08
2nd Qb-6/25/08
3rd Qta-9/10/08
4th Qta-10/15/08
IstQb-3/4/09
2nd Qb-6/23/09
3rd Qb-9/14/09
4tti Qb-12/22/09
1st Qta-2/17/10
2nd Qb-6/14/10
3rd Qta-8/16/10
4ttiQb-10/15/10
1st Qta-2/17/11
2nd Qta-6/7/11
3rd Qta-8/17/11
4tti Qta-11/17/11
12/5/11
1st Qta-1/23/12
2nd Qtr 6/6/12
3rd Qta-9/4/12
(1) VOCs were resampled because laboratory missed holding
NA = not analyzed
NS = not sampled
Bold and red = highest concenbabon since montaonng started
Bold and blue = lowest concentarabon since montaonng started
Shaded indicates concentrataons exceeding GWQS
Bold and italics indicates ttie MDL exceeded ttie GWQS
1st Qta- = January - March
2nd Qb- = Apnl - June
3rd Qb- = July - September
4tti Qb- = October - December
tame
TABLE 1
Historic Summary Of Monitoring Parameters Up To The 3rd Quarter 2012
Chloroform Contamination Investigation
DUSA White 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)
TW4-20
1st Qta-3/16/05 Monitor well was not installed
2nd Qta-5/25/05 NA NA 39,000 NA NA 101
3rd Qta-8/31/05 <10 NA 3,800 <10 <10 2 9
4tti Qta-12/7/05 <2S0 131 19,000 <250 <250 1 8
1st Qta-3/9/06 <S00 120 9,200 <500 <S00 38
2nd Qta- 6/14/06 <S00 235 <500 <S00 94
3rd Qb-7/20/06 <1000 134 5,300 <1000 <1000 29
4ttiQb-11/8/06 7 1 124 11,000 1 9 22 35
IstQb-2/28/07 31 124 4,400 <1 0 1 1 42
2nd Qb-6/27/07 22 112 1,000 <1 0 <1 0 23
3rd Qb-8/15/07 35 117 5,200 <1 0 1 8 21
4ttiQb-10/10/07 68 170 9,000 <1 0 1 9 56
IstQb-3/28/08 9 132 13,000 <1 0 1 5 09
2nd Qta-6/25/08 13 191 30,000 <1 0 1 2 80
3rd Qta-9/10/08 J5 156 21,000 <1 0 37 44
4tti Qta-10/15/08 NA 168 NA NA NA 55
IstQb-3/4/09 57 164 8,200 <1 0 52 51
2nd Qta-6/23/09 49 164 6,800 <1 0 • 42 29
3rd Qb-9/14/09 84 153 13,000 <1 0 44 33
4ttiQb-12/14/09 14 187 15,000 <1 0 30 53
IstQb-2/17/10 179 3,500 <1 0 32 20
2nd Qb-6/14/10 11 200 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 Qta-2/23/11 27 220 31,000 <1 0 190 44
2nd Qta-6/1/10 10 177 8,100 <1 0 21 48
3rd Qta-8/17/11 73 207 3,800 <1 0 31 65
4ttiQb-11/16/11 72 186 7 900 <1 0 25 42
1st Qta-1/23/12 10 207 11,000 <1 0 1 3 79
2nd Qta-6/6/12 33 262 36,000 <1 0 <1 0 11 0
3rd Qb-9/4/12 26 289 13,000 <1 0 <1 0 10 8
TW4-21
IstQb-3/16/05 Monitor well was not ins ailed
2nd Qb-5/25/05 NA NA 192 NA NA 14 6
3rd Qb-8/31/05 <5 0 NA
•
<5 0 <5 0 10 1
4ttiQb-12/7/05 <1 0 353 86 <1 0 <1 0 96
1st Qta-3/9/06 <2 5 347 120 <2 5 <2 5 85
2nd Qta-6/14/06 <2 5 318 120 <2 5 <2 5 102
3rd Qta- 7/20/06 <2 5 357 108 <2 5 <2 5 8 9
4tti Qta-11/8/06 2 296 139 <1 0 <1 0 87
IstQb-2/28/07 1 8 306 160 <1 0 <1 0 87
2nd Qb-6/27/07 58 327 300 <1 0 <1 0 86
3rd Qb-8/15/07 < 1 0 300 140 <1 0 <1 0 86
4ttiQb-10/10/07 <1 0 288 120 <1 0 <1 0 83
1st Qta-3/28/08 7 331 390 <1 0 <1 0 14 3
2nd Qta-6/25/08 "l"7 271 180 <1 0 <1 0 "88
3rd Qb-9/10/08 1 6 244 120 <1 0 <1 0 7 57
4tti Qta-10/15/08 NA 284 NA NA NA 80
4ttiQb-11/18/09 2 NA 170 <2 0 <2 0 NA
IstQb-3/11/09 <1 0 279 180 <1 0 <1 0 83
2nd Qb-6/23/09 <1 0 291 200 <1 0 <1 0 81
3rd Qta-9/14/09 <1 0 281 200 <1 0 <1 0 92
4ttiQb-12/22/09 <1 0 256 160 <1 0 <1 0 84
1st Qta-2/25/10 <1 0 228 170 <1 0 <1 0 84
2nd Qta-614/10 <1 0 266 210 <1 0 <1 0 120
3rd Qta-8/13/10 92 278 390 <1 0 <1 0 14 0
4tti Qta-10/15/10 i 2 210 200 <1 0 <1 0 7 0
IstQb-2/22/11 1 2 303 230 <1 0 <1 0 90
2nd Qta-6/28/11 48 290 290 <1 0 <1 0 12"0
3rd Qb-8/17/11 6 3 287 <fo <1 0 14 0
4ttiQb-11/16/11 287 13 0
12/7/11 67 390 <1 0 <1 0
IstQb-1/19/12 6 4 228 420 <1 0 <1 0 150
2nd Qb-6/13/12 54 285 400 <1 0 <1 0 11 0
3rd Qta-9/13/12 6 142 410 <1 0 <1 0 13 0
(1) VOCs were resampled because laboratory missed holding
NA = not analyzed
NS = not sampled
Bold and red = highest concentrataon since montaonng started
Bold and blue = lowest concenbabon since montaonng started
Shaded indicates concenbataons exceeding GWQS
Bold and italics indicates the MDL exceeded ttie GWQS
1st Qb- = January - March
2nd Qb- = Apnl - June
3rd Qb- = July - September
4tti Qb- = October - December
tame
TABLE 1
Historic Summary Of Monitoring Parameters Up To The 3rd Quarter 2012
Chloroform Contamination Investigation
DUSA White Mesa Mill
Well
Sampling Event
Parameter
GWQS
Well
Sampling Event
Carbon Tetrachlonde
(5 pg/L)
Chloride
(mg/L)
;NO GWQS
Chloroform
(70 pg/L)
Chloromethane
(30 pg/L)
Methylene Chloride
(5 pg/L)
Nitrate, Nitrate + NiU-ite
(10 mg/L)
TW4-22
IstQb-3/16/06 Monitor well was not installed
2nd Qb-5/25/05 NA NA 340 NA NA 182
3rd Qb-8/31/06 <5 0 NA 290 <5 0 <5 0 157
4ttiQb-12/7/06 <5 0 253 320 <5 0 <5 0 151
IstQb-3/9/06 <10 236 390 <10 <to 153
2nd Qb-6/14/06 <10 221 280 <10 <10 14 3
3rd Qta-7/20/06 <10 221 864 <10 <10 14 5
4tti Qta-11/8/06 <1 0 236 350 1 6 <1 0 15 9
1st Qta-2/28/07 <1 0 347 440 <1 0 <1 0 20 9
2nd Qta-6/27/07 <1 0 273 740 <1 0 <1 0 193
3rd Qta-8/15/07 <1 0 259 530 <1 0 <1 0 193
4tti Qta-10/10/07 <1 0 238 440 <1 0 <1 0 188
IstQb-3/28/08 <1 0 519 1,400 <1 0 <1 0 391
2nd Qb-6/25/08 <1 0 271 1,200 <1 0 <1 0 41 9
3rd Qb-9/10/08 1 3 524 <1 0 <1 0 38 7
4tti Qta-10/15/08 NA 539 NA NA NA 36 3
4tti Qtr 11/18/09 <2 0 NA 630 <2 0 <20 NA
1st Qta-3/11/09 <1 0 177 390 <1 0 <1 0 20 7
2nd Qb- 6/23/09 <1 0 177 730 <1 0 <1 0 20 6
3rd Qb-9/14/09 <1 0 391 2,300 <1 0 <1 0 40 3
4ttiQb-12/29/09 <1 0 175 380 <1 0 <1 0 17 8
1st Qta-3/3/10 <1 0 427 2,200 <1 0 <1 0 36 8
2nd Qb-6/14/10 <1 0 134 540 <1 0 <1 0 19 0
3rd Qta-8/24/10 <1 0 130 340 <1 0 <1 0 150
4tti Qta-10/15/10 <1 0 134 340 <1 0 <1 0 160
IstQb-2/22/11 1 2 114 1,300 <1 0 <1 0 180
2nd Qb-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
4ttiQb-11/16/11 174 19 0
'^'12/7/11 <1 0 400 <1 0 <1 0
1st Qta-1/19/12 <1 0 36 200 <1 0 <1 0 14 0
2nd Qtr 6/13/12 <1 0 35 ' r <1 0 <1 0 128
3rd Qta-9/12/12 <1 0 121 <1 0 <1 0 70
TW4-23
2nd Qta-6/27/07 <1 0 47 <1 0 <1 0 <1 0 <0 1
3rd Qb-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
1st Qta-3/28/08 <1 0 41 <1 0 <1 0 <1 0 <01
2nd Qb-6/25/08 <1 0 41 <1 0 <1 0 <1 0 <01
3rd Qta-9/10/08 <1 0 35 <1 0 <1 0 <1 0 <0 05
4tti Qta-10/15/08 NA 51 NA NA NA <0 05
4tti Qta-11/18/09 <2 0 NA <2 0 <2 0 <2 0 NA
1st Qta-3/4/09 <1 0 41 <1 0 <1 0 <1 0 <0 1
2nd Qta- 6/23/09 <1 0 43 <1 0 <1 0 <1 0 <0 1
3rd Qb-9/14/09 <1 0 43 <1 0 <1 0 <1 0 <0 1
4tti Qta-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 <0 1
3rd Qb-8/24/10 <1 0 40 <1 0 <1 0 <1 0 <0 1
4ttiQb-10/15/10 <1 0 34 <1 0 <1 0 <1 0 <0 1
1st Qta-2/16/11 <1 0 44 <1 0 <1 0 <1 0 <0 1
2nd Qb-6/14/11 <1 0 44 <1 0 <1 0 <1 0 <01
3rd Qb-8/16/11 <1 0 41 <1 0 <1 0 <1 0 <0 1
4tti Qta-11/15/11 <1 0 43 <1 0 <1 0 <1 0 <01
IstQb-1/17/12 <1 0 40 <1 0 <1 0 <1 0 <0 1
2nd Qta-5/31/12 <1 0 44 <1 0 <1 0 <1 0 <0 1
3rd Qb-8/29/12 <1 0 46 <1 0 <1 0 <1 0 <0 1
(1) VOCs were resampled because laboratory missed holding
NA = not analyzed
NS = not sampled
Bold and red = highest concenbataon since montaonng started
Bold and blue ^ lowest concentaataon since montaonng started
Shaded indicates concentrataons exceeding GWQS
Bold and italics indicates ttie MDL exceeded ttie GWQS
1st Qb- = January - March
2nd Qb- = Apnl - June
3rd Qb- = July - September
4tti Qta- = October - December
tame
TABLE 1
Historic Summary Of Monitonng Parameters Up To The 3rd 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)
TW4-24
2nd Qta-6/27/07 <1 0 770 26 <1 0 <1 0 "• 26"l
3rd Qb-8/15/07 <1 0 791 22 <1 0 <1 0 29
4tti Qta-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 Qb-9/10/08 <1 0 1180 29 <1 0 <1 0 38 4
4tti Qta-10/15/08 NA 1130 NA NA NA 448
4ttiQb-11/18/09 <2 0 NA <2 0 <2 0 <2 0 NA
IstQb-3/4/09 <1 0 1010 1 4 <1 0 <1 0 30 5
2nd Qb-6/23/09 <1 0 759 1 5 <1 0 <1 0 30 4
3rd Qta-9/14/09 <1 0 618 1 4 <1 0 <1 0 30 7
4tti Qta-12/16/09 <1 0 1080 1 2 <1 0 <1 0 28 3
1st Qta-2/25/10 <1 0 896 1 3 <1 0 <1 0 331
2nd Qta-6/14/10 <1 0 639 1 7 <1 0 <1 0 30
3rd Qb-8/24/10 <1 0 587 1 8 <1 0 <1 0 31
4ttiQb-10/15/10 <1 0 522 1 4 <1 0 <1 0 31
IstQb-2/17/11 <1 0 1100 1 8 <1 0 <1 0 31
2nd Qb-5/26/11 <1 0 1110 1 1 <1 0 <1 0 35
3rd Qb-8/17/11 <1 0 967 1 7 <1 0 <1 0 34
4ttiQb-11/16/11 608 35
'^'12/7/11 <1 0 1 2 <1 0 <1 0
IstQb-1/16/12 <1 0 373 <1 0 <1 0 <1 0 37
2nd Qb-6/6/12 <1 0 355 <1 0 <1 0 <1 0 37
3rd Qta-8/30/12 <1 0 489 <1 0 <1 0 <1 0 37
TW4-25
2nd Qta-6/27/07 <1 0 395 <1 0 <1 0 <1 0 17 1
3rd Qta-8/15/07 <1 0 382 22 <1 0 <1 0 29
4ttiQb-10/10/07 <1 0 358 <1 0 <1 0 <1 0 17
1st Qta-3/28/08 <1 0 374 <1 0 <1 0 <1 0 187
2nd Qta-6/25/08 <1 0 344 <1 0 <1 0 <1 0 221
3rd Qb-9/10/08 <1 0 333 <1 0 <1 0 <1 0 188
4tti Qta-10/15/08 NA 366 NA NA" NA 21 3
4tti Qta-11/18/09 <2 0 NA <2 0 <2 0 <2 0 NA
1st Qta-3/4/09 <1 0 332 <1 0 <1 0 <1 0 153
2nd Qb-6/23/09 <1 0 328 <1 0 <1 0 <1 0 15 3
3rd Qb-9/14/09 <1 0 328 <1 0 <1 0 <1 0 33
4ttiQb-12/14/09 <1 0 371 <1 0 <1 0 <1 0 142
1st Qta-2/23/10 <1 0 296 <1 0 <1 0 <1 0 14 4
2nd Qb-6/14/10 <1 0 306 <1 0 <1 0 <1 0 16
3rd Qta-8/10/10 <1 0 250 <1 0 <1 0 <1 0 14
4tti Qta-10/15/10 <1 0 312 <1 0 <1 0 <1 0 15
1st Qta-2/16/11 <1 0 315 1 8 <1 0 <1 0 15
2nd Qta-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
4ttiQb-11/15/11 <1 0 294 <1 0 <1 0 <1 0 16
IstQb-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
3rd Qb-9/4/12 <1 0 334 <1 0 <1 0 <1 0 17
TW4-26
2nd Qb-6/14/10 <1 0 33 13 <1 0 <1 0 79
3rd Qta-8/24/10 <1 0 17 52 <1 0 <1 0 9
4tti Qta-10/15/10 <1 0 22 54 <1 0 <1 0 96
1st Qta-2/16/11 <1 0 30 2 <1 0 <1 0 10
2nd Qta-5/26/11 <1 0 15 29 <1 0 <1 0 10
3rd Qb-8/17/11 <1 0 19 28 <1 0 <1 0
4tti Qta-11/16/11 26 10
12/7/11 <1 0 52 <1 0 <1 0
1st Qta-1/18/12 <1 0 17 7 <1 0 <1 0 11
2nd Qta-6/6/12 <i"o 19 4 1 <1 0 <1 0 12
3rd Qb-9/11/12 <1 0 19 49 <1 0 <1 0 9
TW4-27
IstQb-1/18/12 <1 0 11 9 <1 0 <1 0 24
2nd Qta-6/13/12 <1 0 17 <1 0 <1 0 <1 0 41
3rd Qb-9/4/12 <1 0 21 <1 0 <1 0 <1 0 37
TW4-65 (Duplicate Sample of 32)
3rd Qb-9/5/12 |<1 0 34|<1 0 <10 |<10 <0 1
TW4-70 (Duplicate Sample of TW4-2S)
3rd Qta-9/11/12 <10 343 13|<1 0 |<1 0 * 160
NA = not analyzed
NS = not sampled
Shaded indicates concenbataons exceeding GWQS
Bold and italics indicates ttie MDL exceeded ttie GWQS
1st Qta- = January - March
2nd Qta- = Apnl - June
3rd Qta- = July - September
4tti Qta- = October - December
Table 2
Summary of QA/QC Samples
3rd Quarter 2012
Parameter GWQS Parameter GWQS Dup icate of MW-32 Duplicate of TW4-25 Parameter GWQS
MW-32 TW4-65 RPD TW4-25 TW4-70 RPD
Nitrate + Nitrite (as N) 10 mg/L <0 1 <0 1 nc 67 72 -7 2
Chlonde none 33 34 -3 0 334 343 -2 7
Chloroform 70 pg/L <1 0 <10 nc 17 16 6 1
Carbon tetrachlonde 5 pg/L <1 0 <1 0 nc <1 0 <1 0 nc
Chloromethane 30 pg/L <1 0 <1 0 nc <1 0 <1 0 nc
Methylene Chlonde 5 pg/L <10 <1 0 nc <1 0 <1 0 nc
nc = not calculated
Tabel 3
Chloroform Mass Removal Calculations
DUSAWhite Mesa Mill, Bland, Utah
3rd Quarter 2012
DRC Mass Removal Calculations
Well ID MW4 MW-26 TW4^ TW4-19 TW4-20
Ave Chloroform (ug/L) 1.500 3,100 1.600 950 13.000
Chloroform (g/L) 1 50E-03 3 10E-03 1 60E-03 9 50E-04 1 30E-02
Chloroform (Ibs/L) 3 31E-06 6 85E-06 3 54E-06 2 10E-06 2 87E-05
Chloroform (lbs/gal) 1 25E-05 2 59E-05 1 34E-05 7 94E-06 1 09E-04
Total gallons pumped 2nd qtr 2012 91.607 25.246 80.006 171.345 22.025
lbs of chloroform removed 1 1 07 1 1 1 4 24
Gallons of chloroform removed 01 01 0 1 0 1 02
total lbs of chloroform removed 6 63
total gallons of chloroform removed 05