DRC-2012-001570 - 0901a068802e231e

State of Utah
GARYR HERBERT
Governor
GREG BELL
Lieiilennni Governor
Department of
Environmental Quality
Amanda Smith
Executive Eh rector
DIVISIGN OF R.ADL\TION CONTROL
Dane L Fmerf rock
Director
C-2012-001570
MEMORANDUM
TO:
FROM:
DATE:
SUBJECT:
Phil Goble
Dean Henderson
May 17, 2011
Review ofthe 4' Quarter 2011 Chloroform Monitoring Report for the Chloroform
Contamination hivestigation, Denison Mines (USA) Corp. (hereafter "DUSA")
White Mesa Uranium Mill, near Blanding, Utah
The Division of Radiation Control (hereafter "DRC") has reviewed 4^*^ Quarter 2011 Chlorofonn
Monitoring Report (hereafter "Report") for the Chloroform Contamination hivestigation. For the
review ofthis report the following regulatory enforcement documents were used:
• DUSA was issued Ground Water Quality Discharge Permit No. UGW370004 (hereafter
"Permit") on March 8, 2005; last revised on January 20, 2010
• The DUSA Quality Assurance Plan (hereafter "QAP") March 22, 2010 (Revision. 6.0)
Review
The Report appeared to be in compliance with the Permit and QAP with the exception of not
meeting the requirements found in sections 4.3.3 and 9.4.1(a) of the QAP. These sections of the
QAP requires:
1.0 ''433. Field Duplicates
One Duplicate set of samples submitted with each Batch (defined in Section 4.3 4) of
samples (DTG, Field and Laboratoiy Quality Assurance/Oualit} ' Control, 7.8), taken from
one ofthe wells being sampled and will be submitted to the Analytical Laboratoiy and
analyzed for all contaminants listed in Table 2 of the GWDP (EPA SW-846, Chapter
J,Section 3.4 1).
4.3.4. Definition of "Batch "
For the purposes of this Plan, a Batch is defined as 20 or fewer samples (PA SW-S46,
Chapter 1, Section 5.0, page 23) "
168 North 1OSQ West • Salt Lake City, UT
Maihng Address PO Box 144850 • Salt Lake Cit>', UT 841 14-4850
Telephone (SOI) 5.^6-4250 • Fax [phone] -TDD (801 ) 536-4414
u mr deq ulah (;ov
Pnnttd till HHJ"n recvcled paper
Page 2
DUSA documented in the Report that 15 of the 27 chlorofonn samples collected in 4th
quarter monitoring event in November 2011, including TW4-6, were not analyzed within the
required holding times for VOCs. This is a violation of Section 8.2 and Table 1 of the QAP.
The remaining 12 samples, including TW4-70 (the duplicate for TW4-6), were analyzed
within the required holding time required for VOCs. The sample for TW4-3 and its
duplicate sample TW4-65 were among the samples that meet the required holding times and
meet the requirement in Section 4.3.3 of the QAP.
DUSA appropnately resampled for the 15 samples with holding time problems for VOCs;
however, DUSA failed to collect a duplicate sample for the fifteen samples that were re-
collected and analyzed in December 2011. This is a violation of Section 4.3.3 of the QAP.
2.0 "9.1 4 (a) Relative Percent Difference.
RPDs will be calculated in comparisons of duplicate and original field sample results.
Non-conformance will exist when the RPD > 20%, unless the measured activities are less
than 5 times the required detection limit (Standard Methods, 1998) (EPA Contract
Laboratoiy Program National Functional Guidelines for Inorganic Data Review, Februaiy
1994, 9240.1-05-01, p. 25). "
Tlie chloroform analytical results comparison between the sample for TW4-6 and its
duplicate sample TW4-70 RPD >20% is as follows:
Parameter GWQS T\V4-6 TW4-70 RPD
Chloroform 70 ng/L 21 Ug/L 50 ng/L 81
DUSA explained how they will prevent the problems of sections 4.3.3 and 9.1.4 (a) in the future
in Section 6.1 (Corrective Actions) of the Report as follows:.
"77?e analytical results for the sample/duplicate pair (TW 4-6/TW 4-70) was outside the
20% RPD acceptance limits. Fifteen of the 27 chloroform program samples collected in
November 2011, including TW4-6, were not analyzed within the required holding times
for VOCs. Tlie remainder of the 27 samples, including TW4-70 (the duplicate for TW4-
6), were analyzed within the required holding time required for VOCs. Fifteen samples
were re-collected and analyzed in December 2011. Comparison of the re-sampled
December 2011 TW4-6parent with the original November 2011 TW4-70 duplicate
sample for the duplicate pair, resulted in an RPD outside the 20%j acceptance limits
As mentioned above, during the fourth quarter chloroform monitoring, the parent sample,
TW 4-6, for the TW 4-6/TW 4-70 duplicate pair was re-sampled and reanalyzed to meet
holding time requirements, while the duplicate itself, TIV4-70, did not require resampling.
Typically, when the laboratoiy has missed holding times or had other QC issues requiring
re-sampling, both the sample and duplicate have been affected by the QC issue and both
required resampling. In the current case, only the parent sample required re-collection and,
as a result, the prime and duplicate sample results for VOCs compared by RPD were not
contemporaneous samples. The original and duplicate results for chlonde and nitrate, both
Page 3
from the November 2011 sampling (that is, from contemporaneous prime and duplicate
samples), did produce RPDs withm acceptable limits.
Denison has determined that for future scenarios involving resampling for one or more
analyses, sampling personnel will collect one or more duplicate samples during the
resampling effort, to ensure that analysis of prime samples and duplicate samples are
pel fonned on contemporaneous samples. The QC manager has instructed the sampling
personnel to follow this revised practice, if resampling is required, beginning with the first
quarter of 2012. "
DRC staff accepts DUSA corrective actions and recommends that no notice of violation be issued
but, instead issue DUSA a Notice of Enforcement Discretion letter (hereafter "NOED") excepting
their corrective actions. Also, in the NOED inform DUSA that the higher chloroform
concentration between TW4-6 (21 |Ag/l) and TW4-70 (50 )ig/l) will be used for compliance
purposes.
Failure to Sample New Well TW4-27
On September 22, 2011 DRC conditionally approved (DRC 2011) for DUSA's plan of action and
work schedule identified as "Plan of Action and Work Schedule Revision 1 for the Installation of
One of More Monitoring Wells Downgradient of TW4-4 and TW4-6" (hereafter "Plan") [DUSA
October 2011]. hi a letter dated November 28, 2011 DUSA stated that the new well, TW4-27, as
a resuh ofthis Plan was installed on October 18, 2011 (DUSA November 2011). In condition
2(b) of this Plan it states in Part concerning the TW4-27:
"2(b) Quarterly water level measurements and sampling will commence during the ne.xt
regularly scheduled chloroform sampling campaign after installation ofthe well. "
The Report documents that the 4"^ quarter chloroform monitoring event occurred between
November 14 and December 7, 2011 and the new well TW4-27 was not sampled. As stated
above, TW4-27 was installed on October 18, 2011. Therefore, DUSA is in violafion of condition
2(b) ofthe Plan. Enforcement action for this violation will be taken through the Plan and not the
QAP or Pemiit.
Page 4
References
Denison Mmes (USA) Corp., March 22, 2010, Wliite Mesa Uranium Mill, Ground Water
Monitoring Quality Assurance Plan (Revision 6.0).
Denison Mines (USA) Corp., October 3, 2011, Plan of Action and Work Schedule Revision 1 for
the Installation of One of More Monitoring Wells Downgradient of TW4-4 and TW4-6.
Denison Mines (USA) Corp., November 28, 2011, State of Utah Ground Water Discharge Permit
No. UGW370004 Wliite Mesa Uranium Mill - histallation Report Pursuant to Part I.F.6 of the
Permit. ,
Denison Mines (USA) Corp., February 27, 2012, White Mesa Uranium Mill Chlorofonn
Monitoring Report 4^*^ Quarter (October tlirougli December 2011)
State of Utah Division of Water Quality Department of Enviromnental Quality, January 20, 2010,
Ground Water Discharge Permit for Denison Mines (USA) Corp. at the White Mesa Mill Facility
Near Blanding, Utah.
State of Utali Division of Radiafion Control, September 22, 2011, Chloroform Contamination
hivestigation Notice of Violation and Groundwater Correctiye Action Order Docket No UGW20
01 DUSA Submittal of a Plan and Work Schedule to Drill and histall Well TW4-27- Conditional
Approval Letter
TABLE 1
HIslorIc Summary Of Monitoring Parameters Up To The 4th Quarter 2011
Chloroform Contamination Investigation
DUSA White Mesa Mill
Weil Parameter
Sampling Event GWQS
Carbon Tetrachloride Chloride
(mgA.)
Chloroform Chloromethane Methylene Chloride Nitrate, Nitrate + Nitrite
(5 pg/L) No GWQS (70 yign.) (30 pg/L) (5 pg/L) (10 mg/L)
MW-4
IstQlr 3/16/05 NA NA 2,900 t^ NA 63
2nd Qtr 5/25/05 " m NA" 3,170 NA NA 7 1
3nj Qtr 8/31/05 <10 NA 3,500 <10 <10 7 0
4th Qtr 12/7/05 <50 53 3^000 <50 <50 7 0
'ist Qtr 3/9/06 <50 49 "3,10'0' <50 ' e'o
2nd Qtr 6/14/06 <50 49 3,000 <50 <50 6 0
3rd Qlr 7/20/06 <50 48 2,820 <50 <50 1 2
4th Qtr 11/8/06 2 1 50j 2,830 1 4 <1 0 6 4
1st Qtr 2/28/07 1 6 47' 2,300" <1 0 <1 0 ' 6 3
2nd Qtr 6/27/07 1 8 45 2,000 <1 0 <:1 0 7 0
3rd Qtr 8/15^07 1 9 47 2,600 <1 0 <1 0-6 2
41h Qtr 10/10/07 1 7 45 2^300 <1 0 <1 0 6 2
Ist Qlr 3/28/08 1 7 42 2.400' <1 0 ilO 58
2nd Qtr 6/25/08 1 8 42 2.500 <1 0 <1 0 5 1
3rd Qtr 9/10/08 1 8 35 1.800 <1 0 <1 0 6 4
4lh Qtr 10/15/08 1 7 45 2.100^ <ro <1 0 59
1st Qtr 3/4/09 1 5 '37 2,200 <1 0 < i' 0 ' 5 7
2nd Qtr 6/23/09 1 3 34 1,800 <1 0 <1 0 52
3rd Qtr 9/14/09 1 4 43 2,000 <1 0 <1 0 53
4lh Qlr 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 '4,0
2nd Qtr 6/14/10 1 2 41 2,100 <1 0 <1 0 5 1
3rd Qtr 8/6/10 1 5 38 1,900 <1 0 <1 0 4 8
41h Qtr 10/15/10 1 4 41 ; i- .n <1 0 <1 0 4 9
1st Qtr 2/23/11 1 5 '40 1,700 <1 0 "<1 o" 4'6
2nd Qlr 6/1/11 14 " 35 1,700 <1 0 <1 0 4 9
3rd Qtr 8/17/11 1 1 41 1,700 <1 0 <;1 0 4 9
4lhQtr 11/16/11 1 3 40 1 600 <1 0 <1 0 5 1
MW-»A(TW4-A)
1st Qtr 3/16/05 NA NA 3,700 NA NA 7 1
2nd Qtr 5/25/05 NA " t^ 3,740 NA NA 7 8
3nJ Qtr 8/31/05 <10 NA 3,800 <10 <fO 6 9
4th Qtr'12/7/05 <50 55 3.000 <50 <50 6 7
Ist Qlr 3/9/06 <50 53 3,700~ <50 <50" 58
2nd Qtr 6/14/06 <50 54 3,300 <50 <50 7 3
3n3 Qtr 7/20/05 <50 54 3,190 <50 <50 1 2
4lh Qtr 11/8/05 2 4 54 3,370 <1 0 cl 0 7 1
1st Qtr 2/28/07 60 2,500 <10 <1 0 71
Well abandonded
MW-26 (former TW4-15)
1st Qtr 3/16/05 NA NA 310 NA NA 0 3
2nd Qtr 5/25/05 NA NA 442 NA NA 0 2
3rd Qtr 8/31/05 <5 0 NA 960 54 <5 0 02
4th Qtr 12/7/05 <50 55 tJJOO <50 <50 0 3
ist Q'tr 3/9/06 <50 52' 'i.i"oo" <50 <50 02
2nd Qtr 6/14/06 <50 52 830 <50 <50 0 2
3rd Qtr 7/20/06 <50 65 2,170 <50 <S0 1 4
4th Qlr 11/3/06 <1 0 54 282 <1 0 2 6 0 3
1st Qtr 2/28/07 <1 0 56 570' <'l 0 55 0 6
2nd Qtr 6/27/07 <1 0 49 .•JCli <1 0 13 04
3rd Qtr 8/15/07 <1 0 57 1,400 <1 0 36 1
<1 0 57 2,000 <1 0 14 06
1st Qtr 3/28/08 <i 6 49 930 <1 0 "'40 0 1
2nd Qtr 6/25/08 <i o" 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 <To 49 950' '<1 0 51 '04
2nd Qtr 6/23/09 <1 0 48 410 <10 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 2 3
1st Qtr 2/17/10 <1 0 57 730 <1 0 X9 02
2nd Qtr 6/14/10 1 2 40 1,600 <1 0 <1 0 ' 6 8
3rd Qtr 8/16/10 <1 0 49 2.200 <1 0 21 0 6
4th Qtr 10/15/10 <1 0 65 970 <1 0 5.5 0 7
1st Qtr 2/23/11 <1 0 " 57 "i50 <1 0 ' 36 05'
2nd Qtr 5/31/11 <1 0 88 1,800 <1 0 1 3' 0 4
3nd Qtr 8/17/11 <i o" 58 720 <1 0 '72 0 9
4th Qtr 11/16/11 69 20
"'12/5/11 <1 0 1^00 <1 0 2 9
(1) VOCs were resampled because lalwratory missed holding tjme
NA = not analyzed
NS = not sampled
Shaded Indicates concentrations exceeding GWQS
Bold and red = highest concentration since montionng started'
Bold and blue = lowest concentration since montionng started
Bold and italics indicates the MDL exceeded the GWQS
1st Qtr = January - March
2nd Qtr = Apnl - June
3nd Qtr = July - Septemtjer
4th Qtr = Octotier - December
TABLE 1
Historic Summary Of Moniloring Parameters Up To The 4th Quarter 2011
Chloroform Contamination investigation
DUSA White Mesa Mill
Well
Sampling Event
Carbon Tetrachloride Chloride
(mg/L)
No GWQS
Parameter
GWQS
(70pgn.)
Chloromethane
(30 pg/L)
Methylene Chloride
(5pgA.)
Nitrate, Nitrate + Nitrite
(10 mg/L)
MW-32 (fomier
1st Qtr 3/16/05
2nd Qtr 5/25'05
M Qtr 8./31/05
4th Qtr 12/7/05
1st Qlr 3/9/06
2nd Qtr 6/14/06
3rd Qlr 7/20/06
4th Qtr 11/8/06
1.stQtrZ'28707
2nd Qtr 6/27/07
3rd Qlr 8/15/07
4lh Qtr 10/10/07
"ist Qtr 3/28/08
2nd Qtr 6/25./08
3rd Qtr 9/10/08
4th Qtr 10/15/08
1st Qlr 3/4/09
nd Qtr 6/23/09
3rd Qtr 9/14/09
4th Qtr 12/16/09
1st Qtr 2/17/10
2nd Qtr 6/14/10
3rel Qtr 8/16/10
4m Qtr 10/15/10
1st'Qlr'2/23/11
2nd Qtr 5/25/11
3rd Qtr 8/16/11
4th Qtr 11/16/11
"'12/7/11
TW4-17)
NA
NA
<1 0
^10
<1 0
<1 0
<1 0
<1_0
<1 0
<1 0
<1 0
<1 0
<1 0
<1 0
<1 0
<1 0
'<1 0
•^1 0
<1 0
<1_0
"<i o'
<1 0
<1 0
NA
<i'o
<1 0
<1 0
<1 0
<1 0
11° <i b'
<1 0
<^ 0
<1 0
<1 0
<1 0
<1 0
U_P_
<1 0
<i 0
<i 0
11 0
<1 o'
<i 0
<1 0
<_i_o_
"<1 0
<1 0
<1 0
<1_0_
•:1 0
<io
<1 0
<1 0
<1 0
<1 0
<1 0
<1 0
<1 0
<1 0
<1 0
<1 0
UA
<1 0
<1 0
<1 0
<1J3_
<1 0
<1 0
<1 0
<1 0
<1 0
<1 0
NA
NA
<1 0
<1 0
<1 0
<1 0
<1 0
<±0_
<1 0
1 0
1 0
1 0
10-
<1 0
<1 0
<1 0
<1_(D_
<1 0
<1 0
<1 0
<1 0
<0 1
<0 1
<0 1
<0 1
<0 1
<0 1
<1 0
< 1
<1 0
<1 0
<1 0
<1 0
<(3 05^
< 1
<0 1
<0 1
<0 1_
<o'i'
<0 1
<0 1
•=0 1__
<o"T
<0 1
•=0 1
<0 1
TW4-1
1st Qtr 3/16/05
2nd Qtr 5/25/05
3rd Qtr 8/31/05
4th Qlr 12/7/05
'lstQ1r3ra/06
2nd Qlr 6/14/06
3nj Qtr 7/20/06
4lh_Q](^12/8/05_
1st Qtr 2/2HJ07
2nd Qtr 6/27/07
3nj Qtr 8/15/07
4th Qtr 10/10/07
ist Qlr 3/2'a'08
|2nd Qtr 6/25/08
3nJ Qtr 9/10/08
4th QlrJ0/_15/08
ist Qtr l'l 1/09
2nd Qtr 6/23/09
3nJ Qtr 9/14/09
•Ijh QlL 12/29/09
Isi Qtr 3/3/10
2nd Qtr 6/14/10
3rd Qlr 8/18/10
4th Qtr 10/15/10
1st Qtr 2/24/it
2nd Qlr 6/1/11
3rd Qtr 8/18/11
4th Qtr 11/29/11
NA
NA
<fO
<50
<50
<50
2,700
3,080
2,900
2,400
'2,'700'
2,200
2,840
2,260
1,90'0'
1,900
2,300
_2,0<K)
2,000
1,900
1,700
1,700_
' 1,700
1,500
1,700
1 400
'l,300'
1,600
1,600
[,500
' 1,300
I 2: {i
1,300
1,500
NA
NA
<10
<50^
<50
<50
<50
<1 0
<1 0
<1 0
•=1 0__
it'o
<1 0
<1 0
<1 0
NA
NA
<10
<50_
iso
<50
<50
<1 0^
<:iO
<1 0
<1 0
<1_0_
<1 0
<1 0
<1 0
<10_
'<1 0
<1 0
<1 0
< i q_
<1 0
0
<1 0
5L0_
<1 0
<i 0
<i 0
<i 0
9 1
10 6
9 8
9 7
9 4
9 6
__9
8'9
TW4-2
1st Otr 3/16/05
2nd Qtr 5/25/05
3rd Qtr 8/31/05
4th Qtr 12/7/05
1st Qtr 3/9/06
2nd Qlr 6/14/05
3rd Qtr 7/20/06
4th Qtr 11/B/06
'ist Qlr 2/28/07 '
2nd Qtr 6/27/07
3rd Qtr 8/15/07
4tti Qtr 10/10'07
'ist Qtr 3/28/08
2nd Q1r6,'25/08
3rd Otr 9/10/08
4th Qtr 10/15/OB
4l^h_QtrJ1/ia^
1st Qtr 3/11/09
2nd Qtr 6/23/09
3rd Qtr 9/14/09
4lh_QtLl2/29j09
1st Qlr 3^/10
2nd Qlr 6/14/10
3rd Qtr 8/18/10
4th Otr 10/15/10
<10
<50_
<50
<50
1st Otr 2/24/11
2nd Qtr 6/2/11
3rd Qtr 8/17/11
4lh Oir 11/29/11
3 700
3,750
3,900
J,_5(»
3,800
3,200
4.120
2,300"
3,000
•J-VJ
3,200
3,300
3,100
2,600
NA
<10
<50_
<50
<50
<50
<1 0
jyoo
3,100
2,800
3,000
_1,600
2,600
3,300
3,300
_3j000
3,100'
3,000
2,400
3,900
1 0
:1 0
<1 0
1_0_
<1 0
1 0
<1 0
NA
<2 0_
1 6
<1 0
<1 0
1 0_
1 0
<io
1 0
1 0
1 0
1 0
<1 0
NA
NA
<fO
<50
'<50
<50
<50
<1 0
<1 0
<1 0
<1 0
1_0_
1 0
1 0
<1 0
NA
<2 q_
10
<1 0
1 0
JO
1 0 '
1 0
1 0
<1 0^
:iO
:1 0
;1 0
(1) VOCs were resampled because laboratory missed holding time.
NA = not analyzed
NS = not sampled
Shaded indicates concentrations exceeding GWQS
Bold and red = highist concentration since moniloring started
Bold and blue = lowest concentration since montionng started.
Bold and italics indicale^s the MDL exceeded the GWQS
1st Qlr = January - March
2nd Qtr = Apnl - June
3rd Qlr = July - Septemtjer
4lh Oir = Oc1ot)er - December
TABLE 1
Historic Summary Of Monitoring Parameters Up To The 4th Quarter 2011
Chloroform Contamination Investigation
DUSA White Mesa Mill
Well Parameter
Sampling Event GWQS
Carbon Tetrachloride Chloride Chloroform Chloromethane Methylene Chloride Nitrate, Nitrate + Nitrite
(5 pg^)
(mg/L)
No GWQS (70 pg/L) (30 pg/L) (Span.) (10 mg/L)
TW4-3
Ist Crtr 3/16/05 NA NA <1 0 NA NA 3 5
2nd Qtr 5.'25.'05 NA NA <1 0 NA NA 3 7
3rd Qtr 8/31/05 <1 0 NA <1 0 6 4 <1 0 3 5
4 th Qtr 12^/0^5_ <1 0 26 <1 0 <1 0 <:1 0 3 3
Ist Qlr 3/9/06 <i o' '2'6 <1 0 2 3 <! 0 '33
2nd Qtr 6/14/06 <1 0 26 <1 0 1 6 <1 0 7 1
3rd Oir 7/20/O6 <1 0 26 <1 0 22 <1 0 2 9
4th Qtr 11/8/06 <1 0 23 <1 0 <1 0 "<1 0 1 5
1st Qtr 2/28/07 "<1 0 22' < 10 " •<i 0 <1 6 3 1
2nd Qtr 6/27/07 <1 0 23 <1 0 <1 0 <i 0 3 3
3rd Qtr 8/15/07 <t 0 24 <1 0 <1 0 <i 0 3 1
4thOtrJ0^iq/q7_ <1 0 27 <1 0 <1 0 <i 0 2 8
1st Qtr 3/28/08 <ro 21 <1 0 <1 0 < 1 0 " ' "28'
2nd Qtr&/25/08 <1 0 19 <1 0 <1 0 <^ 0 29
3rtl Qtr 9/10/08 <1 0 19 <1 0 <1 0 <i 0 2 7
4lh Qtr 10/15/08 <1 0 22 <1 0 <1 0 <1 0 26
tsl Qtr 3/4/09 <1 0 ' 21 <1 0 <ro elO" " " '25
2nd Qtr 6/23/09 <1 0 20 <1 0 <1 0 <1 0 2 9
3nJ Qtr 9/14/09 <1 0 21 <1 0 <t 0 <1 0 2 8
4lh Qtr 12/29/09 <1 0 22 <1 0 <1 0 <1 0 1 26
1st Qtr 2/23/10 <1 0 23' <1 0 <i b " ' <1 0 ' 28
2nd Qlr 6/14/10 <1 0 24 <1 0 <1 0 <1 0 30
3rd Qlr 8/10/10 ^1 0 22 <1 0 <1 0 <1 0 3 1
4JhOlTjO/J5/10 <1 0 26 <1 0 <1 0 <1 0 3 3
Tsl Qtr2/15Jl1 <ib 23 <1 0 <1 0 <1 0 ' 3 5
2nd Qlr 575/11 <1 0 23 <1 0 <1 0 <1 0 3 7
3nd Qlra'16/li d 0 23 <1 0 <1 0 • <1 0" 4 0
4lh Qtr 11/14/11 <1 0 23 <1 0 <1 0 •=1 0 4 4
TW4-4
1st Qtr 3/16/05 NA NA "3',100 NA NA 10 0
2nd Qlr a25'05 NA NA 2,400 NA NA 'lis
3nj Qlr 8/31/05 <10 NA 3,200 <10 <J0 99
41tLQtrJ2/7/0_5_ <50 54 _^ 2^800 <50 <50 l'0'2
1st Otr 3./9/06 <50 5i 2,900 iio <50 9 5
2nd Qtr 6/14/06 <50 48 2,600 <50 <50 86
3nJ Qtr 7/20/06 <S0 50 2,850 <50 <50 9 7
4lhQtr 11/8/06 1_7 49 2j670 <1 0 <1 0 loi
ist Qtr 2/28/07 15 49" 2.200 <1 0 <1 0 90
2nd Qtr 6/27/07 1 7 47 2.400 <1 0 <1 0 9 4
3rd Qtr 8/15/07 1 5 45 2,700 <1 0 <1 0 9 5
4lh_Otr_iqm/07_ 1 5 47 2,500 <1 0 9 5
1st Qtr 3/28/08 1 6 43 2,800' <1 0 "<1 0 " 9"2
2nd Qtr 6/25/08 1 5 42 2,500 <1 0 <1 0 •' " 106
3rd Qtr 9/10/08 1 4 39 2,200 <:1 0 <1 0 80
4lh Qtr 10/15/03 NA 44 NA NA NA 10^1
4'JlQ'Ll!.'18/09^ <2 0 NA _ _2j&TO <2 0 <2 0 _ NA
ist Qtr 3/4/09 12 37" 2,200 '<io <1 6 " " 10 2
2nd Qlr 6/2.3,'09 1 2 34 1,800 <1 0 •:1 0 82
3rd Qtr 9/14/09 1 1 39 2,000 <1 0 <1 0 84
''IJP_Oir^l2/29/09 1 1 41 95C' <:1 0 <1 0 7 6
tsl Qtr 2/17/10 1 48 i,70b '<i'o"" '<1 0 • • ' 6'6
2nd Qtr 6/14/10 1 2 35 1700 <1 0 <1 0 7 6
3rd Qtr 8/10/10 1 3 36 2,100 <1 0 <1 0 7 3
4thjjtr_iq/1_5{ip 1 3 _ _ .._38 ^J00 <1 0 <1 0 _ 7 1
1StQtr2j2'37l1 ' 14" 41 1,800 <1 0 <i 6 7''b
2nd Qtr 6/1/11 1 2 35 1,700 <1 0 <1 0 7 0
3rd Qtr 8/17/11 <1 0 40 1,500 <1 0 <:1 0 66
4th Qtr 11/16/11 1 39 1,500 <1 0 <1 0 7 0
TW4-5
ISl Qtr 3/16/05 NA NA 126 NA NA 4 9
2nd Qtr 5/25/05 NA NA 113 NA NA 3 7
3rd Qtr 8/31/05 <2 5 NA 82 58 <2 5 60
4th Qtr 12/7/05' <2 5 56 63 2 5 <2 5 60
tsl Qtr a'9/06 <2 5 ' '52 66" 3'l "60
2nd Otr 6/14/06 <2 5 • 51 51 3 1 <2 5 59
3rd Qtr 7/20/06 <1 0 54 53 7 •:1 0 <1 0 6 7
4th Qtr 11/8/06 <1 0 55 47 1 <1 0 <1 0 2 9
1st Qtr 2/28/67 d 0 . - • "57 35 <1 0 <l6 7"8'
2nd Qlr 6/27/07 <1 0 45 26 <1 0 <1 0 70
3n1 Qtr 8/15/07 <1 0 38 92 <1 0 <1 0 7 7
4th Qlr 10/10.'07 <1 0 39 _9 4 <1 0 <1 0 82
Ist Qlr 3/28/08 <1 0 36 11 <1 0 < 1 6 7 4
2nd Qlr 6/25/08 <1 0 37 9 3 •=1 0 <1 0 8 7
3n1 Qtr 9/10/08 <1 0 34 11 <1 0 0 7 9
4th Qtr 10/15/08 <1 0 37 10 <1 0 ":1 0 93
1slQtra'4/09' < 1 0 il 12 <i 0' '". <1 0 " '7 9
2nd Qlr 6/23/09 <1 0 37 13 <1 0 <1 0 7 5
3rd Otr 9/14/09 <1 0 48 12 <1 0 <1 0 8 3
4m Qtr 12/29/09 <1 0 41 8 5 <1 0 <\ 0 7 5
Isl Qtr 2/25/10 <io ' 43 " 13 <1 0 <1 0 6 e
2nd Qtr 6/14/10 <1 0 28 12 <1 0 <1 0 7 1
3rtJ Qtr 8/11/10 <1 0 38 12 <1 0 <1 0 7 0
4th_QtrJ_0/25/iq <1 0 41 11 <1 0 <1 0 72
ist Qtr 2/22/11 ' <10 34 "lo <Vo" <1 0 7'b
2nd Qlr 5/26/11 <1 0 35 . 9 <1 0 <1 0 7 2
3rd Qtr 8/7/11 <1 0 37 10 <1 0 <1 0 7 5
4mQtr 11/16/11 30 1 6 0
"' 12'7/11 <1 0 <1 0 <1 0
1) VOCs were resampled because laboralory missed holding I
NA = not analyzed
NS = not sampled
Bold and red = highisl concenlralion since montionng started
Bold and blue = lowest concentration since montionng started
Shaded indicates conceritralions exceeding GWQS
Bold and italics indicates the MDL exceeded Ihe GWQS
1sl Qtr = January - t.larch
2nd Qtr = April - June
3rd Qtr = July - September
4tti Qtr = October - Decemt>er
TABLE 1
Historic Summary Of Monitoring Parameters Up To The 4th Quarter 2011
Chloroform Contamination investigation
DUSA White Mesa Mill
Well
Sampling Event
Parameter
GWQS
Cartx)n Tetrachloride
(5 pg/L)
Chloride
(mg/L)
;NOGWQS
Chloroform
(70 pg/L)
Chloromethane
(30pgn.)
Methylene Chloride
(5 pg/L)
Nitrate, Nitrate + Nitrite
rW4-6
1st Qlr 3/16/05
2nd Qtr 5/25/05
3rd Qtr 8/31/05
4thQtrJ2/7^05__
1st Qlr 3/9/06'
2nd Qlr 6/14/06
3rd Qtr 7/20/06
4m Otr 11/8/06
Isl Qlr 2/28/07
2nd Otr 6/27/07
3rd Otr 8/15/07
4th Qtr 10/10/07
NA
NA
<1 0
<1 q_
< 1 0
<1 0
<1 0
<]_0_
<1 0
<1 0
<1 0
<1 0
1st Otr 3/28/08
2nd Otr 6/25.08
3rd Qtr 9/10/08
4m Otr 10/15/08
tsl Otr 3/11/09
2nd Qlr 6/23/09
3rd Qtr 9/14/09
4m Qtr 12/29/09
1st Qtr 2/25/10
2nd Qtr 6/14/10
3n1 Qlr 8/11/10
4m_QU 1_0/15/JI0
1st Qtr 2/23/11
2nd Qlr 5/26/11
3rd Otr 8/17/11
4th Qlr 11/16/11
"' 12/7/11
11/16/11
•=1 0
<1 0
<1 0
<1 0
<1 0
<1 0
<1 0
<1 0
<i'o'"
<1 0
<1 0
<1 0
<1 0
:1 0
:1 0
:1 0
81
120
280
.-250
1000
590
630
420
<1 0
•;1 0
<1 0
£1 0_
<1 0
<i 0
•=1 0
<1 0
<1 0
<1 0
<1 0
<1 0
< 1 0
<1 0
<1 0
NA
NA
<X 0
<1 0
< 1 o'
<1 0
<1 0
<i_q
<1 0
<1 0
<i 0
<i q^
<i 0
<i 0
<1 0
<10_
'<i b
<1 0
<i 0
<i q_
<10
<1_0
<1 o'
<i 0
TW4-7
1st Qtr 3/16/05
2nd Qtr 5/25/05
3nJ Qtr 8/31/05
4m_Qtr 12/7/q5_
1st Qlr'3/9/06
2nd Qtr 6/14/06
3rd Otr 7/20/06
isl Olr 2/28/07
2nd Qlr 6/27/07
3n1 Qtr 8/15/07
4m_Qtj^1O/iq/07
1st Qtr 3/28/08
2nd Qtr 6/25/08
3rd Qtr 9/10/08
4th Qlr 10/15/08
4thptiJ 1/18/09
I'sl Qtr 3/11/09"
2nd Qtr 6/23/09
3rt Otr 9/14/09
4th Qtr 12/29/09
tsl Qtr 3/3/10
2nd Qlr 6/14/10
3rd Qlr 8/11/10
4lh Qtr 10/15/10
1st Olr 2/23/11
2nd Qtr 6/1/11
3rd Qtr a/18/11
4m Qtr 11/29/11
NA
NA"
<10
<50
'iso'
<50
<50
NA
<2 0
3.100
2.700
3,100
1,900
2,200
2,140
2,160
1,~830
2,600
2,300
1,900
'27'bb
1,800
1,600
<1 0
<1 0
_2,M0
1,800
1,400
1,500
J,30_0
1.200'
1.100
1.500
1.300
1.200
t 200
NA
NA
<10
<5q
"<50
<50
<50
<1 0 <rb'
<i 0
<i 0
<i 0
'<i 6
<i 0
<^ 0
NA
l?iL
<i 0
<i 0
<i 0
<i_o_
<1 6
<i 0
<i 0
<i 0
<i 0
<i 0
<io
<50_
<50 "
<50
<S0
<i b"
<1 0
<i 0
•=1 0
<i 0
NA
<2 0_
<1 0
<1 0
<1 0
<1 0
52
54
52
5 3
1
4 5
4 7
4_6
6
5 1
4 7
4 7
4 2
4 8
4 16^
4 01
"T7
3 8
TW4-8
1st Qtr 3/15/05
2nd Otr 5/25/05
3nJ Qtr 8/31/05
•i"5.9i''_12/7m_5_
1st'Qtr3/9/06
2nd Qtr 6/14/06
3rd Qlr 7/20/05
4m OU 11/8/06
1st Qtr 2/28/07
2nd Qlr 6/27/07
3nJ Qtr 8/15/07
4m Otr 10/10/07
isl Qlr 3/28/08
2nd Qtr 6/25/OS
3rd Qtr 9/10/08
41h Otr 10/15/08
isl Qtr 3/4/09
2nd Otr 6/23/09
3rd Qtr 9/14/09
4Jh"QtM 2/17/09
1st Qtr 2^4/10
2nd Qtr 6/14/10
3rd Qtr 8/18/10
4lh Qlr 10/15/10
1st Qtr 2/16/11
2nd Otr 5/25/11
3rd Qtr 8/16/11
4lh Qlr 11/16/11
12/7/11
NA
<1 0
<1 0
'<1 0
<1 0
<1 0
<1_0_
'<1 0
<1 0
<1 0
'<1 0
<1 0
<1 0
<1 0
<1 0
<io
<1 0
<1_0_
"<1 0
•=1 0
<1 0
<1 0
<1 0
<1 0
<1 0
<1 0
<1 0
<:l 0
<1 0
<1 0
<1 0
<1 0
1 0
:1 0
<1 0_
<ro
<1 0
<1 0
<1_0_
<1 0
<1 0
<1 0
cl 0_
<1 0
<1 0
<1 0
<1_0_
•cl b
<1 0
<1 0
llO-
<1 0
<1 0
<1 0
<1 0
cl 0
<1 0
<1 0
<_1_0_
'<1 0
<1 0
<1 0
< 1 0_
"cio
:1 0
• \ 0_
:i0
:l 0
:1 0
1 b
1 0
<1 0
:1 0
0 05
c_0_05_
"<0 1
0 1
0 1
<oC_^
"<0 1
0 1
0 1
0 1
:b 1
0 1
0 1
02
(1) VOCs were resampled because laboratory missed holding time
(2) Results ot me TW4-70 Ihe duplicate sample for TW4-6
NA = not analyzed
NS = not sampled
Shaded Indicates concentrations a^ceeding GWQS
Bold and red = highest concentration since montionng started
Bold and blue = lov;est concentration since montionng started
Bold and italics indicates the MDL exceeded me GWQS
I5I Qlr = January - March
2nd Qtr = April - June
3rtl Qtr = July - Seplember
4ih Otr = October - December
TABLE 1
Historic Summary Of Monitoring Parameters Up To Tfie 4th Quarter 2011
Chloroform Contamination investigation
DUSA White Mesa Mill
Weii
Sampling Event
Parameter
GWQS
Cartion Tetrachloride
(5pgA.)
Chloride
(mg/L)
;NO GWQS
Chloroform
(70 pg/L)
Chloromethane
(30 pg/L)
Methylene Chloride
(5 pg/L)
Nitrate, Nitrate + Nitrite
(10 mg/L)
TW4-9
1st Otr 3/16/05
2nd Olr 5/25'05
3rd Qlr 8/31/05
mLQiL.l.s./T/os
1st Qlr 3/9/06
2nd Qtr &/14/06
3rd Qtr 7/20.'06
4ihQtr ma'oe
Isl Q\r 2/28107'
2nd Olr 6./27/07
3relQtr8/15'07
4m Qtr 10/JU)[07
1st Qtr 3/28/08
2nd Qtr 6/2a'08
3nj Qtr9/10,TI3
4m Qlr 10/15/09.
1st Otr 3/4/09
2nd Qtr 6/23/09
3rd Qtr 9/14/09
4th Qlr 12/17/09
ist Qtr 2/23/10
2nd Qtr 6/14/10
3rd Qtr 8/13/10
4m Otr 10/15/10
Isl Otr 2/17/11
2nd Qtr 5/25/11
3nJQtr 8/16/11
4m Qtr 11/16/11
(1) 12/7/11
M 0
cl 0
<1 0
cl 0
c1 q
'c"io
c1 0
c1 0
<1_0_
cl 0
cl 0
cl 0
fiP-.
cl o"
<1 0
Cl q
ci_q
ci o '
Cl 0
cl 0
cj_0_
cl 0"
cl 0
cl 0
cl 0
c1 0
cl 0
cl O"'
cl 0
cl 0
< 1 0
cl o'
<1 0
cl 0
cl q_
c1 0
c1 0
cl 0
<1 0
ClO
c1 0
c1 0
cl 0
cl 0
<1 0
cio"
c1 0
cl 0
Cl 0_
c"i 0
Cl 0
<1 0
<1_0_
cl 0
cl 0
cl 0
cJ0_
c1 0 '
cl 0
cl 0
cl 0
2 1
2 3
2 79
2 5
2 3
2 5
1 "4"
TW4-10
Isl Qtr 3/16/05
2nd Qtr 5/25/'05
3rij Qtr 8/31/05
^m QU12m05_
l"st"Qtr 3/9/05"
2nd Qtr 6/14/06
3nd Qlr 7/20/06
4th Qtr 11/8/06 _
1st Qtr 2/28/07 "
2nd Qtr 6/27/07
3nd Otr 8/15/07
4m_QtrjlO£IO/07
1st'Qlr 3/28/08
2nd Qtr 5/25/08
3rd Otr9/10/08
4m Qtr 10/15.'08
41hOtM1/18/09
ist Qtr 3/11/09
2nd Qtr 6/23/09
3rd Otr 9/14/09
4m_OtM2,5_2m9
1stQtr3.''3/10
2nd Qlr 6/14/10
3nj Qtr 8/12/10
4mQtrJ0/15/KI
1st Qtr 2/23/11
2nd Qtr 6/14/11
3rd Qtr 8/17/11
4th Otr li/16/11
NA
NA
<2 5
52.5_
<5b
<5 0
c5 0
U P_
cio .
cl 0
cl 0
<±0_
"ci 0
cl 0
cl 0
NA
£2 0
cl "0"
c1 0
cl 0
cl 0
'c1 0
c1 0
cl 0
cl 0
140
62 4
110
_3p0
190
300
504
_452
500
350
660
470
"620
720
660
1.200
l.i 00
1,200
910
300
460
220
' 100
vm
620
280
180
' 10
NA
c2^
c5 0
c5 0
c5 0
ii'o"
cl 0
<1 0
cl 0_
db
cl 0
cl 0
NA
<20_
"i i 0 "
<1 0
NA
NA
c2 5
c2 5
c5 0
c50
c5 0
d_0_
Cl 0
cl 0
cl 0
Cl 0
<1 0
Cl 0
cl 0
08
11.0
1 1
TW4-11
1st Qlr 3/15/05
2nd Qlr 5/25/05
3n1 Qtr 8/31/05
4th Qlr 12/7/05 _
1st Qtr 3/9/06
2nd Qtr 6/14/06
3rd Qtr 7/20/06
1st Qtr 2/28/07
2nd Qtr 6/27/07
3nJ Qlr 8/15/07
4th_Otr_10/_1^0/07
Ist Qtr 3/28/08
2nd Otr 6./25/08
3rd Qtr 9/10/08
4th Qtr 10/15/03
i'iLQl?-Uil8/p9
1st Qtr 3/11/09
2nd Qtr 6.'23/09
3nJQtr 9/14/09
41h_OtrJ2/29./q9
1st Qtr 3/3/io
2ndQtra'14/10
3rd Otr 8/12/10
4m otr_ion5/iq
Isl Qtr 2/23/1 i'
2nd Qtr 6/1/11
3rd Qtr 8/17/11
4lh Olr 11/16/11
NA
NA
<10
<100^
<50
•c50
<50
NA
£2^0
cl 0'
cl 0
Cl 0
il 0
cl 0
Cl 0
cl 0
4,400
3,590
4,400
4,400'
4,300
4,080
^660
3,600
3,800
4,MO
340
. 640
900
vmq
1,000
980,
1,000
__860_
620
820
800
_720
"1 ;obb'
930
820
1500
NA
NA
ClO
<ioo
<50
<50
<50
il"'0~
cl 0
cl 0
Cl 0
<1 0
cl 0
NA
c2^0_
cl 0
;1 0
;1^
Tl 0 "
<1 0
<1 0
cl 0^
cTo
cl 0
cl 0
c1 0
NA
NA
<fO
<fOO
<50
<50
<50
c2 0
cl 0 "
c1 0
cl 0
c1_0
cl 0 "
cl 0
87
10 3
94
_94
92
10 0
10 0
10 0
'10 i
10 6
10.2
^9 8
" 7"7"
7 3
7 9
9 5
^73
6 8
70
_6 5
" 6 8
• 6 9
67
_6 4
6 5
7 3
7 1
7 1
(1) VOCs were resampled because laboratory missed holding lime
NA - not analyzed
NS = not sampled
Shaded indicates concentrations exceeding GWQS
Bold and red = highest concentration since monlionng started
Bold and blue = lowest concentration since montionng started
Bold and italics indicates me MDL exceeded the GWQS
1st Qlr = January - March
2nd Qtr = Apnl - June
3rd Qtr = July - September
4m Qlr = October - December
T/SBLE 1
Historic Summary Of Monitoring Parameters Up To The 4lh Quarter 2011
Chloroform Contamination Investigation
DUSA White Mesa Mill
Well Parameter
Sampling Event GWQS
Carbon Tetrachloride Chloride Chloroform Chlorometfvane Methylene Chloride Nitrate, Nitrate + Nitrite
(mgA.)
(SpgA.) No GWQS (70 pg/L) (SOpgA.) (SpgA.) (10 mgA.)
TW4-12
Isl Qtr 3/16/05 NA NA cl 0 NA NA 1 4
2nd Qlr 5/25/05 NA NA cl 0 NA NA 1 6
3rd Qlr 8/31/05 Cl 0 t-JA <1 0 58 cl 0 1 5
4m Qlr 12/7/05 cl 0 19.^ c1 0 1 0 cl 0 1 4
1st Qtr 3/9/06 Cl 0 19 c1 0 2 5 cl 0 i'i
2nd Qtr 6/14/06 cl 0 16 cl 0 1 4 c1 0 1 4
3rd Qlr 7/20/06 cl 0 16 c1 0 1 4 c1 0 1 4
4th Otr 11/8/06_^ cl 0 16 c1 0 c1 0 c1 0 1 4
1st Qlr 2/28/07 <1 0 16 db cl 0 c1 0 - 1 5
2nd Qtr 6.'27/07 Cl 0 18 c1 0 cl 0 c1 0 1 5
3rd Qtr 8/15/07 Cl 0 29 d 0 c1 0 c1 0 1 4
4m Qtr 10/10/07 cl 0 16 cl 0 Cl 0 cl 0 1 4
1st Qlr 3/28/08 Cl 0 16 cl 0 ClO cl.O ' '1 6
2nd Otr 6/25/Oa <1 0 19 cl 0 cl 0 <io 2 7
3rd Qlr 9/10/08 cl 0 18 cl 0 cl 0 d 0 2 7
4m Olr 10/15/08 CIO 22 cl 0 d 0 cl 0 2S
ist Qtr "3/11/09 Cl 0 "" ' ."23 db' ilO cio "'24
2nd Otr 6/23/09 Cl 0 22 cl 0 Cl 0 cl 0 38
3rd Otr 9/14/09 CIO 22 cio c1 0 cio 5 1
4th Qlr 12/16/09 c1 0 23 cl 0 cl 0 cio 3 6
Isl Qlr 2/23/10 Cl 0 22 d 0 cl 0 cTo ' 4'0
2nd Qtr 6/14/10 <1 0 29 cl 0 c1 0 cl 0
3nj Otr 8/10/10 cl 0 35 cl 0 cl 0 cl 0 90
41h Qlr 10/15/10 Cl 0 31 c1 0 c1 0 c1 0 8 0
tsl Qtr 2/15/11 c 1 0 "' 31 cl 0 cl 0 cio 6 5
2nd Qlr 5/25/11 cl 0 32 cl 0 cl 0 Cl 0 7
.3rd Qtr 8/16/11 Cl 0 31 cl 0 Cl 0 cl 0 6 8
41h Qtr 11/15/11 cl 0 30 c1 0 cl 0 cl 0 8 0
TW4-13
Isl Qtr 3/15/05 NA NA d 0 NA NA 4 2
2nd Qlr 5/25/05 NA NA d 0 NA NA ' 4 3
3rd Otr 8/31/05 cl 0 NA d 0 3 1 ClO 1 4 6
4th QtrJ2/7/q5_ cl 0 69 d 0 c1 0 cl 0 4 3
ist'Oir 3/9/06 cl 0 " 67 cl 0 r7 il 0 ' 42
2nd Qlr 6/14/06 <1 0 66 cl 0 14 c1 0 4 9
3rd Qlr 7/20/06 <1 0 65 cl 0 cl 0 cl 0 4 3
4lhQlr 11/8/06 cl 0 33 cl 0 Cl 0 cl 0 08
Isl Olr 2/28/07 <1 0 59 cTo cl 0 cl 0 '40
2nd Qlr 6/27/07 cl 0 59 cl 0 cl 0 cl 0 4 6
3rd Qtr 8/15/07 Cl 0 58 cl 0 cl 0 c1 0 4 4
4m Qtr 10/10/07 cl 0 58 cl 0 c1 0 cl 0 4 1
1st Otr 3/28/08 cl 0 54 cl 0 cl 0 c1 0 3 8
2nd Olr 6/25/03 cl 0 58 cl 0 c1 0 cl 0 4 2
3nl Qlr 9/10./08 c1 0 50 c1 0 cl 0 cl 0 " 4 3
4m Qtr 10/15/08 cl 0 58 cl 0 cl 0 cl 0 4 6
1st Qtr 3/4/09" CIO " "58 c1 0 cl 0 'd 0 ' 3 7
2nd Qtr 6/23/09 c1 0 57 cl 0 cl 0 cl 0 1 2
3rtJ Qlr 9/14/09 ' c1 0 63 cl 0 cl 0 cl 0" 4 7
4th Qtr 12/16/09 cl 0 60 cl 0 cl 0 cl 0 4 1
i"st Qlr2/24/io ' "c 1 o' " 53 c1 0 " cl 0 'cl 0' '"•43
2nd 01^6/14/10 cl 0 53 cl 0 cl 0 cl 0 52
3pd Qlr 8/10/10 cl 0 55 cl 0 cl 0 cl 0 5 6
4th Qlr 10/15/10 cl 0 55 c1 0 cl 0 cl 0 58
ist Qlr 2/1^/11 ' cib "60 cio cl 0 cio' 5 5
2nd Qtr 5/25/11 <1 0 56 cl 0 cl 0 cio 6 4
3rcl Qlr 8/16/11 c1 0 60 c1 0 d 0 Cl 0 52
41hOtr 11/15/11 cl 0 54 c1 0 cl 0 Cl 0 59
TW4-14
1st Qlr 3/16/05 NS NS NS NS NS NS
2nd Qtr 5/25/05 NS NS NS " ' NS NS NS
3rd Olr 1/05 NS NS NS NS NS NS
4tti Qtr 12/7/05 NS NS NS NS NS NS
ist oir 3/9/06 NS NS NS " "NS " NS NS'
2nd Qtr 6/14/06 NS NS NS NS NS NS
3rd Qtr 7/20/05 NS NS NS NS NS NS
4th Qtr 11/8/06 cl 0 37 NS cl 0 51 0 2 4
IstQlr 2/28/07 cl 0 38 c1 0 cl 0 ' ' CIO 2 3
2nd Qtr 6/27/07 cl 0 38 Cl 0 cl 0 Cl 0 1 4
3rd Otr 8/15/07 cl 0 36 cl 0 Cl 0 Cl 0 1 1
4lh Qtr 1Q/10./07 cl 0 38 cl 0 cl 0 c1 0 08
1st Otr 3/28/08 cl 0 57 iib Cl 0 ' cl 0 ' 04
2nd Otr 6/25/08 cl 0 35 cl 0 cl 0 Cl 0 1 6
3rd Qtr 9/10/08 cl 0 34 d 0 d 0 Cl 0 1 38
41h Olr 10/15/08 cl 0 40 cl 0 cl 0 _ C1 0 0 76
1st Qlr 3/4/09 i 1 0 35 d 0 '" cl 0 cib ' ie
2nd Olr 6/23/09 cl 0 36 cl 0 cl 0 Cl 0 14
3nj Qlr 9/14/09 cl 0 38 cio d 0 Cl 0 1 5
4m Qlr 12/16/09 cio 34 cl 0 cl 0 c1 0 ^ _24
1st Qtr 3/3/io c1 0 ' "••33 cib cl 0 cio 2 5
2nd Otr 6/14/io cl 0 49 cl 0 cl 0 cl 0 2 9
3nd Otr 8/10/10 cl 0 35 c1 0 cl 0 cl 0 2 8
4m_Otr_10/jl5/1_q cl 0 29 cl 0 cl 0 _ cio _ 29
Ist0lr2/15/il ClO " -" ' 25 d 0" ••1 0 c'l 0' 18
2nd Otr 6/14/11 Cl 0 24 d 0 cl 0 Cl 0 1 4
3rd Otr 8/16/11 Cl 0 33 c1 0 cl 0 cl 0 2 6
4th Qlr 11/15/11 cl o' 15 cl 0 cl 0 d 0 1 7
NA = not analyzed
NS = not sampled
Shaded indicates concentrations exceeding GWQS
Bold and italics indicates the MDL exceeded the GWQS
1 sl Qtr = January - March
2nd Qlr =/\pnl - June
3nj Qtr = July - September
4th Qlr = October - Dejrember
TABLE 1
Historic Summary Ot Monitoring Parameters Up To The 4th Quarter 2011
Chloroform Contaminalion investigation
DUSA White Mesa Mill
Well Parameter
Sampling Event GWQS
Cartjon Tetrachloride Chloride Chloroform Chloromethane Metfiylene Chloride Nitrate, Nitrate * Nitrite
(SpftO.)
(mgA.)
No GWQS (70pga.) (30pgA.) (5 pg/L) (10 mgA.)
TW4-16
1st Qlr 3/16/05 NA NA '240 NA NA CO 1
2nd Qtr &/25/05 NA NA 212 NA NA CO 1
3njQtr 8/31/05 cl 0 NA 85 3 2 43 CO 1
4lh Otr 12/7/05 d 0 64 14 _ 2 6 5 9 1 4
1st Qlr 3/9/06 Cl 0 '60 39 11 '21 3
2nd Qtr 6/14/06 cl 0 55 13 2 4 89 1 9
3rd Otr 7/20/06 c1 0 60 52 cl 0 2 7 2 7
4th Qtr 11/8/05 Cl 0 62 13 6 cl 0 9.2 5 6,
1st Qtr 2/28/07 cl 0 79 '8 7 cl 0 6 6 12 3
2nd Qtr 6/27/07 c1 0 75 2 6 cl 0 18 99
3rd Otr 8/15/07 d 0 65 7 1 c1 0 5 1 54
4lh Olr 10/10/07 Cl 0 69 1 4 cl 0 1 4 4
1st Olr 3A28/08 it 0 52 ll cio 26 "'cO 1
2nd Qtr 6/25/08 cl 0 58 cl 0 cl 0 cl 0 1 5
3rcl Olr 9/10/08 c1 0 71 10 cl 0 14 '' 10.5
4th Otr 10/15/03 cio 89 3 9 cl 0 66 9 8
1st (31r 3/4/09 cl 0 73 cio cl 0 Cl 0 9 6
2nd Olr 6/23/09 d 0 76 cl 0 cl 0 cl 0 89
3rd Otr 9/14/09 c1 b 79 cl 0 c1 0 cl 0' ' 8 8
4m Otr 12/17/09 cl 0 76 cl 0 cl 0 Cl 0 5 2
1st Otr 2/24/10 cl 0 77 cl 0 cl 0 c1 0 4 2
2nd Qtr 6/14/10 cl 0 64 2 1 cl 0 cl 0 4 7
3rd Qtr 8/24/10 cl 0 72 4 3 cl 0 cl 0 4 6
4lh Otr 10/15/10 c1 0 71 3 cl 0 cl 0 3 3
1st Olr 2/22/11 cl 0 " 86" ' 15 cl'b Cl 0 7
2nd Qlr 5/26/11 cl 0 81 16 Cl 0 ct 0 5
3rd Otr 8/17/11 cl 0 63 92 cl 0 cl 0 1 7
4th Qtr 11/16/11 38 04
"' 12/7/11 cl 0 c1 0 cl 0 1 4
TW4-18
1st Qtr 3/16/05 NA NA 38 NA NA "14 1
2nd Olr 5/25/05 NA NA 29 8 NA NA 12 9
3rd Qtr 8/31/05 cl 0 NA 39 2 8 cl 0 13 3
4th Otr 12/7/05 cio ' _j 41 14 1 1 Cl 0 '"73
1slQlr3./9/06 cl 0 ~36 I2 1 6 cl 0 5 9
2nd Qtr 6/14/06 c1 0 35 12 2 7 cl 0 4 7
3nJ Otr 7/20/06 cl o' 35 10 8 cio c1 0 6 1
4m Olr 11/8/06_^ cl 0 34 12 5 cl 0 c1 0 5 7
1st Otr 2/28/07 cl 0 "so" 92 ClO cl 0 5 1
2nd Otr 6J27/07 c1 0 28 8 c1 0 cl 0 4 9
3rd Qlr 8/15/07 cio 32 89 cl 0 cl 0 5 0
4lh OtMp/l_0/J)7^ cl 0 27 74 c1 0 cl 0 4 4
ist Qlr 3/28'/08 " cio 23 '64 CIO cl 0 0 7
2nd Q\rG/25J08 cl 0 23 57 Cl 0 cl 0 4 6
3rd Olr 9/10/08 cl 0 26 8 cl 0 cl 0 4 9
4m QtrJO/15/08 cl 0 30 9 4 cl 0 cl 0 52
Isl Qtr 3/4/09 cl 0 29 11 cl 0 cl 0 5 2
2nd Qtr 6/23/09 cl 0 30 16 c1 0 Cl 0 6 2
3rd Qtr 9/14/09 cio 26 13 CIO cl 0 59
4lh Qtr_12^22^_ c1 0 ^30 82 cl 0 cl 0 54
1st Otr 2/24/10'" cl 0 41 69 c1 0 cl 0 si
2nd Qtr 5/14/10 cl 0 35 29 c1 0 cl 0 9 0
3rcl Qtr 8/12/10 cl 0 37 29 cl 0 cl 0 90
4m Qtr lb/15/10 cl 0 50 30 cl 0 cl 0 10 0
ist oir 2/22/11 cl 0 52 39' il 0 cio ibb
2nd Otr 5/26/11 cl 0 36 26 ct 0 c1 0 9.0
3rd Qtr 8/17/11 cl 0 23 29 cl 0 cl 0 4 6
4th Qtr 11/16/11 23 6 3
"' 12/7/11 cl 0 28 Cl 0 cl 0
TW4-19
1st Qtr 3/16/05 NA NA ^ ' 2,200 NA NA 53
2nd Otr a/25/05 NA NA 1.200 NA NA 57
3n1 Qlr 8/31/05 c5 0 NA 1,400 c5 0 c5 0 4 6
4lh Qtr 12/7/05 <50 81 2,800 •c50 <50 <^qj
Ist Qtr 3/9/06 <50 86 1.20'b <50 <50 4
2nd Otr 6/14/06 <50 116 1 too <50 <50 52
3rd Otr 7/20/06 <50 123 1 120 <50 <50 4 3
4lh Qlr 11/8/06 1 6 134 1.050 2 6 cio ^4 6
Isl Otr 2/28/07 13 133 ii"b . 'cio 4
2nd Otr 6/27/07 Did not sample
3rd Qtr 8/15/07 1 9 129 ' ' i.iob cl 0 cl 0 4 1
4th Qtr 10/10/07 19 L 132 1,100 cl 0 d 0 4
1slQtr.3/2'8/08' "2 9 '131 "l,80b cl 0 cl 0 2 2
2nd Otr 6/25/08 cl 0 128 1,000 cl 0 cl 0 2 8
3rd Qtr 9/10/08 8.6 113 3 600 cl 0 cl 0 35 2
4th Otr 10/15/08 12 124 4,200 cl 0 Cl 0 47 8
1st Qtr 3/4/09 1 2 i27' 1,100' cl 0 cl 0 32
2nd Qtr 6/23/09
3nJ0lr 9/14/09
1 2
15
132
43
990
6,60D
cl 0
Cl 0
cl 0
cio
2 4
CO 1
4 m Qtr 12/22/09 16 . , 124 4,700 Cl 0 cl 0 26 7
1st Qtr 2/17/10 1 3 144 940 cl 0 Cl 0 2
2nd Qlr 6/14/10 4 2 132 1.800 cl 0 c1 0 4 4
3rd Qlr 8/16/10 4 9 142 2.000 cl 0 c1 0 5 9
4m Otr 10/15/10 1 3 146 1.200 cl 0 cl 0 2 7
Isl Qlr 2/17/11 17 I35 3 400 cio' cio "17'0
2nd Otr 6/7/11 83 148 4.000 cl 0 c1 0 12 0
3nJ Otr 8/17/11 2i' 148 970 cl 0 c1 0 30
4th Qtr 11/17/11 148 50
"' 12/5/11 54' 2,200 c1 0 cl 0
](1) VOCs were resampled because latxjratory missed holding lime
= not analyzed
NS = not sampled
Bold and red = highest concentration since montionng started
Bold and blue = lowest concentraLon since moniloring started
Shaded indicates concentrations exceeding GWQS
Bold and italics indicates the MDL exceeded me GWQS
1st Qlr = January - March
2nd Qlr = Apnl - June
3rd Qlr = July - Seplemtjer
4th Qtr = October - December
TABLE 1
Historic Summary Of Moniloring Parameters Up To The 4th Quarter 2011
Chloroform Contamination Investigation
DUSA White Mesa Mill
Weil
Sampling Event
Parameter
GWQS
Carbon Tetrachloride
(SpgA.)
Chloride
(mg/L)
:NO GWQS
Chloroform
(70pgA.)
Chloromethane
(SOpgA.)
Methylene Chloride
(SpgA.)
Nitrate, Nitrate + Nitrite
(10 mgA.)
TW4-20
1st Qtr 3/15/05
2nd Qtr 5/25/05
3rd Qtr 8/31/05
4th_Qlr 12/7/q5_
1st Otr'3/9/b6
2nd Qtr 6/14/06
3nj Qtr 7/20/06
4m Otr 11/8 06
1st Qtr 2^78/07"
2nd Qlr 6/27/07
3n1 Otr 8/15/07
•ith Otr 10/ia07
ist Qtr 3/28/08
2nd Otr 6/25/08
3rd Qtr 9/10/08
4m Qlr 10/15/08
1st Qtr 3/4/09
2nd Qtr 6/23/09
3nj Qlr 9/14/09
I't] P'J.L2/14/0_9
1st'Qtr2/17/io"
2nd Qlr 6/14/10
3rd Qtr 8/16/10
41 h_Q]r^ 10/15/^10
Isl Qtr 2/23/11
2nd Qtr 6/1/10
3rd Qtr 8/17/11
4lh Qtr 11/16/11
Monitor well was not installed
NA
<fO
•<250
<500'
<500
<100O
_131
120
235
134
J24
124
112
117
JI70
' 132
191
156
J68
' 164
164
153
J87
179
200
196
203
220
177
207
186
39,000
3,800
19,000
"'9,200
61.000
5.300
_i_i_,qooj
4,400
1,300
5,200
9,(KK1
"13.000'
30,000
21,000
"~"e"^2bo
6,800
13,000
J^,Mp
3,500'
18,000
15.000
_24_,qoo
31,000
8,100
3,800
. 7.900
NA
cio
£250
<500'
<500
<1000
cl 0
cl 0
d 0
d_0_
il 0
cl 0
cl 0
NA_
cl 0'
c1 0
c1 0'
cTo
c1 0
cl 0
cl 0_
iTb
cl 0
d 0
NA
<fO
<250 _
<500
<500
dOOO
1 2
3 7
'572'
4'2
4 4
3_0
"3 2
3 7
2 2
JlA
19 0
' 2 1
10.1
2 9
TW4-21
Isl Qtr 3/15/05
2nd Otr 5/25/05
3rd Otr 8/31/05
4m QU_12_/7/05
isl Qtr 3,'9/'06 '"
2nd Qtr 6/14/06
3nJ Qtr 7/20./06'
4lh Qlr 11/8/06
ist Qtr 2/28/07
2nd Qtr 6/27/07
3rd Qtr 8/15/07
4m Qtr 10/10/07
1st Qtr 3/28/08 '
2nd Qtr 6/25/08
3rd Qlr 9/10/08
4th Otr 10/15/08
4th Qtr 11/18/09
Isl Qtr 3/11/09
2nd Qtr 6/23/09
3rd Qtr 9/14/09
4lh Qlr 12/22/09
Isl Cfir 2/25/10 '
2nd Otr 614/10
3rd Qtr 8/13/10
4th Otr 10/15/10
1st Qtr 2/22/11 '
2ndOtr6'28/10
3rTl Qtr 8/17/11
4m Qlr 11/16/11
"' 12/7/11
NA
-SO
•=1 0
'<2 5 '
c2 5
--2 5
NA
<T6~
•:1 0
<1 0
d 0_
d'o
--1 0
NA
NA
353
347'
318
357
2 295
i 8 306
5 8 327
300
"7 '"'331
1 7 271
1 6 244
284
J2 tslA_
'279
291
281
256
228
266
92 278
1 2 210
1 2 303
4 8 290
6 3 287
287
6 7
14.6
10.1
9 6
8 5
io'2
8 9
87
"8 7
86
86
8_3
14.3'
8 8
7 57
8 0
~~6 3
8 1
9 2
12 0
14.0
_7_0
9 0
'12 0
'14.0
13.0
TW4-22
1st Qtr 3/16/05
2nd Otr 5/25/05
3rd Qtr 8/31/05
4m Qtr 12/7/05
1st Qlr 3/9/06
2nd Qlr 6/14/06
3rd Otr 7/20/06
4th Qlr'11/8/06
lstQtr'2/28/07
2nd Qtr 6/27/07
3ndQlr 8/15/07
.4m_Qb;_l_q/JO/07
IstQlr 3/28/08
2nd Qtr 6/25/08
3nj Qtr 9/10/08
4m Qtr 10/15/08
4 m QtrJJ/J8/q9
1st Qtr 3/11/09 '
2nd Otr 6/23/09
3rd Otr 9/14/09
4th Otr 12/29./09
istQtr3/3/lo
2nd Qtr 6/14/10
3rd Qtr 8/24/10
4th Qlr 10/15/10
1st Qtr2722/'li
2nd Otr 6/1/11
3rd Qtr 8/17/11
4th Qtr 11/16/11
"M2/7/II
NA
<:5 0
i5_0
<fO "
<10
<10
d q_
i;l 0
<:1 0
^1 0
d q^
'^io
^1 0
NA
_<2 0_
^"1 0
d 0
<:l 0
d 0
•iTo"
cl 0
cl 0
<:l 0
.;1 0 .
253
"236'
221
221
236
'347'
273
259
_2.38
519
271
524
539
~l77"
177
391
J7_5
"427'
134
130
134
Ili
138
120
174
18 2
157^
_15 J
15 3
14 3
14 5
15 9
'209,
19.3,
193'
18 8
'~39.'V
41.9
38 7
36 3
20 7
20 6
40 3
JI3
36 8
19.0
15.0
J_6j0
18.0
17.0
15.0
19.0
(1) VOCs were resampled because laboratory missed holding lime
NA = not analyzed
NS = not sampled
Bold and red = highest concentration since montionng started
Bold and blue = lowest concentration since montionng started
Shaded indicates concentrations exceeding GWQS
Bold and italics indicates me MDL exceeded me GWQS
1st Qlr = January - March
2nd Qlr = Apnl - June
3rd Qtr = July - Seplember
4ih Qtr = October • December
TABLE 1
Historic Summary Of Monitoring Parameters Up To The 4th Quarter 2011
Chloroform Contamination Investigation
DUSA White Mesa Mill
Well Parameter
Sampling Evenl GWQS Sampling Evenl
Carbon Tetrachloride Chloride
(mgA.)
Chloroform Chloromethane Methylene Chloride NlUate, Nitrate + Niulte
(SpgA.) No GWQS (70pgA.) (30pgA.) (SpgA.) (10 mgA.)
TW4-23
2nd Qtr 6/27/07 cl 0 47 cl 0 cl 0 cl 0 cO 1
3rd Otr 8/15/07 cl 0 46 c1 0 c1 0 c1 0 CO 1
4th Otr 10/10/07^ cl 0 43 cl 0 c_1 0 cio cO 1
1si'Qlr3.'2'a'08 ^To" 41 ^cl 0 cio il 0 cbl
2nd Qtr 6/25/08 ClO 41 cl 0 cl 0 c1 0 cO 1
3rd Otr 9/10/08 cl 0 35 cl 0 cl 0 cl 0 CO 05
4lh Qtr 10/15/08 NA 51 NA NA NA CO 05
4th_Qlr 1M/ia;i30 c2 0 NA_ c2 0 c2 0 c2 0 NA
isl Qlr 3./4/09 cio"" 41 cl 0 cl 0 cl 0 CO 1
2nd Qtr 6/23/09 Cl 0 43 Cl 0 c1 0 cl 0 CO 1
3rd Qlr 9/14/09 ci 0 43 c1 0 ct 0 cl 0 CO 1
4thQlr 12/16/09 cl 0 37 Cl 0 Cl 0 d 0 cO 1
1st Otr 2/24/10 ' cl o' 45 cio cl 0 cl 0 "cb 1
2nd Qlr 6/14/10 cio 40 cl 0 cl 0 c1 0 CO 1
3rd Qtr 8/24/10 cl 0 40 cl 0 cl 0 d 0 • ' cO 1
4th Otr 10/15/10_ cl 0 J 34 d 0 cl 0 cO 1
l'stOtr2/'l'6/11 ' cio 44 cl 0 cib d"o io 1 '
2nd Olr 6/14/11 cio 44 cl 0 cl 0 cl 0 CO 1
3nj Qlr 8/16/11 cl 0 41 c1 0 cl 0 cl 0 cO 1
4th Qtr 11/15/11 cl 0 43 cl 0 cl 0 cl 0 <0 1
TW4-24 -2nd Olr 6/27/07 cl 0 770 26 cl 0 cl.O 26 1
3nd Qtr 8/15/07 cl 0 791 2 2 cl 0 cl 0 29
4th Qtr 10/10/07 c1 0 692 1 5 ^10 cio 24.7
Ist'Otr 3./28/08 Cl 0 740 15 ilO cl 0 " 24.4
2nd Qtr 6/25/08 c1 0 834 1 4 cl 0 Cl 0 45.3
3'rd Qtr 9/10/08 cl 0 1180 2 9 cl 0 c1 0 384
4th QU 10/15.'08 NA 1130 NA NA NA 44.8
4th QU 11/18/09 c2 0 NA c2 0 c2 0 NA '
islQu"3/4/09" cl 0 ' iolo 1 4 cio" clo 30.5
2nd QU 6/23/09 cl 0 759 1 5 cl 0 cl 0 30.4
3rd QU 9/14/09 cio. 618 1 4 c1 0 Cl 0 30.7
4th OU l2/16/09_ Cl 0 1080 1 2 ClO cl 0 28.3
Isl Qtr 2/25/10 cl 0 ; 896 ii il 0 cio "' " 33 1
2nd QU 6/14/10 cl 0 639 1 7 cl 0 cl 0 30
3rd Qtr 8/24/10 cl 0 587 18 cl 0 cl 0 31
4th OU 10/15/10_ cl 0 _522 1 4 c1 0 cl 0 3-1
Isl QU 2/17/11 'do' 1100 1 8 ClO cl 0 '31
2nd OU 5/26/11 cl 0 1110 1 1 d 0 cl 0 35
3rd Qtr 8/17/11 cl 0 967 1 7 cl 0 c1 0 34
4mOU 11/16/11 608 35
"'12/7/11 cl 0 1 2 cl 0 c1 0
TW4-25
2nd OU 6./27/07 cl 0 395 cl 0 c1 0 cl 0 17 1
3rd Qtr 8/15/07 c1 0 382 2 2 cl 0 cio. '. 29
4m Qtr 10/10/07 cio 358 cl 0 ct 0 cl 0 17
tsiQuscs/oa db 374 cl 0 "c1 0 cio 18.7
2nd Qu 6/25/08 c1 0 344 d 0 d 0 cl 0 22.1
3nJ Otr 9/10/08 c1 0 333 cl 0 ct 0 cl 0 186
4th Qlr 10/15/08 NA 366 NA NA NA 21.3
4lh OIM1/18/09_ c2 0 NA c2 0 <20 c2 0 NA
I'st Qtr 3/4/09 Cl 0 332 cl 0 Cl 0 cl 0 15.3
2nd Ou 6/23/09 CIO " 328 cl 0 Cl 0 Cl 0 153
3rd OU 9/14/09 cl 0 328 cl 0 Cl 0 c1 0 3 3
4lh Qtr 12/14/09 cl 0 371 cio CIO cl 0 .14.2
Isl Qlr 2/23/10 Cl 0 1 296 c'io "il b il 0 14 4
2nd OU 6/14/10 cl 0 306 cl 0 Cl 0 cl 0 16
3nj QU 8/10/10 Cl 0 250 ct 0 Cl 0 Cl 0 14
4lh Qtr 10/15/10. Cl 0 312 ct 0 cl 0 cl 0__ 15
Ist Qlr 2/16/11 Cl 0 315 1 8 cl b d 0 "l5
2nd Qtr 5/25/11 cl 0 321 cl 0 cl 0 cl 0 16
3rd Otr 8/16/11 Cl 0 276 cl 0 Cl 0 cl 0 ^ 16
4mQlr 11/15/11 d 0 294 cl 0 c1 0 cl 0 16
TW4-26
2nd Qlr 6/14/10 Cl 0 33 13 Cl 0 cl 0 7 9
3rd Olr 8/?4/10 Cl 0 17 52 Cl 0 cl 0 9
4m Qlr 10/15/10 cl 0 22 54 Cl 0 c1 0 9 6
Isl QU 2/16/11 <10 " ""30 Cl b iib 10
2nd OU 5/26/11 Cl 0 15 29 Cl 0 cl 0 10
3njQtr 8/17/11 Cl.O 19 2 8 C1 0 cl 0 •• 11
4lhQtr 11/16/11 26 10
"'12/7/11 C1 0 52 c1 0 cl 0
(1) VOCs were resampled Ijecause laboratory missed holding I
NA = nol analyzed
NS = not sampled
Shaded Indicates concentrations exceeding GWQS
Bold and italics Indicates the MDL exceeded the GWQS
1st Otr = January • March
2nd QU = Apnl - June
3rd Ou = July - September
4th QU = October - December
TABLE 1
Historic Summary Of Monitoring Parameters Up To The 4th Quarter 2011
Chloroform Contamination Investigation
DUSA White Mesa Mill
Well Parameter
Sampling Evenl GWQS
Carbon Tetrachloride Chloride Chloroform Chloromethane Methylene Chloride Nitrate, Nitrate + Nitrite
(SpgA.)
(mgA.)
No GWQS (70 pg/L) (30pgA.) (5 pg/L) (10 mgA.)
TW4-65 (Duplicate Sample of TW4-3)
4th Qtr 11/15/11 dO 23 CIO CO C10 4 4
TW4-70 (Duplicate Sample of TW4-6)
4th Qlr 11/16/11 CIO CIO 33 50 CIO 0 8
NA = not analyzed
NS = not sampled
Shaded indicates concentrations exceeding GWQS
Bold and italics indicates the MDL exceeded me GWQS
isl Ou = January - Marcti
2nd Ou = /\pnl - June
3rd Qu = July - September
4m Qtr = October - December
Table 2
Summary of QA/QC Samples
4th Quarter 2011
Parameter GWQS Parameter GWQS Duplicate of TW4 ^3 Duplicate of TW4-6 Parameter GWQS
TW4-3 TW4-65 RPD TW4-6 TW4-70 RPD
Nitrate + Nitrite (as N)
Chloride
10 mg/L
none
23 23
44
<1.0
0.0 0.8 08
33
0.0
8 7
Nitrate + Nitrite (as N)
Chloride
10 mg/L
none 4.4
<1.0
23
44
<1.0
0.0
nc
36
08
33
0.0
8 7
Chloroform 70 pg/L
4.4
<1.0
23
44
<1.0
0.0
nc 21 50
<1.0
-81.7
Carbon tetrachloride 5 pg/L <1.0 <1.0 nc <1.0
50
<1.0 nc
Chloromethane 30 pg/L
5 pg/L ^
<1 0 <1.0
<1 0
nc
nc
<1.0
<1.0
<1.0 nc
Methylene Chloride
30 pg/L
5 pg/L ^ <1.0
<1.0
<1 0
nc
nc
<1.0
<1.0 <1 0 nc
nc = not calculated