DRC-2011-007141 - 0901a0688025a866

DENISO MINES
Denison Mines (USA) Corp.
1050 17th Street, Suite 950
Denver, CO 80265
USA
Tel : [phone]
Fax : [phone]
www.denisonmines.com
14 August 8, 2011
VIA PDF AND FEDEX
Rusty Lundberg,
Co-Executive Secretary
Utah Water Quality Board
Utah Department of Environmental Quality
195 North 1950 West
P.O. Box 144850
Salt Lake City, UT 84114-4850
Re: State of Utah Ground Water Discharge Permit No. UGW370004
White Mesa Uranium Mill - Notice Pursuant to Part l.G.l (a)
Dear Mr. Lundberg:
The White Mesa Mill (the "Mill") performed second quarter ("Q2") groundwater monitoring
during the period from April 1, to June 20, 2011 under the February 15, 2011 version of the
Mill's Groundwater Discharge Permit (the "GWDP"). All analytical data needed for comparison
to the GWCLs was received during the period ending July 8, 2011.
Pursuant to Part I.G.l.a) of the GWDP, (February 15, 2011) please take notice that the
concentrations of specific constituents in the monitoring wells highlighted in yellow and bold
italics in the columns for the second quarter in the attached Table 1, exceeded their respective
GWCLs. For ease of review, Table 1 has been formatted to simplify the tracking of any
continued exceedances from one monitoring period to the next by charting ongoing monitoring
of the same well in the same row, and by highlighting exceedances (in color and bold italics).
Part l.G.l c) of the GWDP states "that the Permittee shall prepare and submit within 30 calendar
days to the Executive Secretary a plan and a time schedule for assessment of the sources, extent
and potential dispersion of the contamination, and an evaluation of potential remedial action to
restore and maintain groundwater quality to insure that Permit limits will not be exceeded at the
compliance monitoring point and that DMT or BAT will be reestablished." The summary below
relating to the second quarter 2011 exceedances includes, for each exceedance, a brief discussion
of whether such a plan and schedule is or is not required or appropriate at this time in light of
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other actions currently being undertaken by Denison, as determined by Utah Department of
Environmental Quality (UDEQ) Staff as stated in teleconferences with Denison on April 27 and
May 2, 2011. Where applicable, the plan and time schedule for assessment will be submitted to
the Executive Secretary within 30 days of this exceedance notice.
Under the February 15, 2011 revision of the GWDP, GWCLs have been determined on a well-
by-well basis to reflect background groundwater quality, as defined by the mean plus second
standard deviation concentration, or the equivalent. Accordingly, the GWDP requires that
constituent concentrations in each monitoring well shall not exceed the GWCLs set out in Table
2 of the GWDP. It should be noted that, because the GWCLs have been set at the mean plus
second standard deviation, or the equivalent, un-impacted groundwater would normally be
expected to exceed the GWCLs approximately 2.5% of the time. Therefore, exceedances are
expected in approximately 2.5% of all sample results, and do not necessarily represent impacts to
groundwater from Mill operations.
The following are items of note relevant to all exceedance data presented herein:
1. Nitrate + nitrite and chloride in monitoring wells at the site are the subject of an ongoing
investigation. In the December 30, 2009 Nitrate Contamination Investigation Report,
prepared by Intera, Inc., Intera has concluded that the elevated nitrate + nitrite and
chloride concentrations observed at the Mill resulted from sources unrelated to the Mill's
operations. UDEQ subsequently determined that the CIR is incomplete, and Denison has
agreed to perform an expanded investigation into potential Mill-related and non-Mill
related sources. Additional investigations and negotiations with UDEQ are currently in
progress. Based on information provided by UDEQ in teleconferences on April 27, and
May 2, 2011, due to the ongoing investigations, the 30-day plan and schedule for
assessment is not required for nitrate + nitrite and chloride exceedances at this time.
2. As discussed in previous quarterly groundwater sampling reports, the background levels
and GWCLs for pH were established based on eight or more quarters of laboratory data,
which are historically higher than field data due to effects from the evolution of carbon
dioxide, and subsequent increase in pH from field to lab. Denison's letter to the Co-
Executive Secretary of the Utah Water Quality Board dated January 31, 2011 proposed
the recalculation of the GWCLs for field pH. Following the statistical evaluation of pH
data by Denison's geochemical consultant, INTERA, Inc., Denison compared the Mill's
most recent groundwater pH data from the second quarter of 2011, including accelerated
sampling results as recent as June 2011, and noted that all of the June 2011 groundwater
results, and many of the other results fi:-om the second quarter, were already outside the
revised GWCLs to be proposed in the June 30, 2011 letter. By the letter dated June 30,
2011, Denison proposed to submit to DRC by August 31, 2011 a Work Plan and
Schedule to complete investigations to address the site-wide pH issue. Denison also
requested the opportunity for a meeting with DRC in July or August 2011, to discuss
Denison's findings to date and to agree upon the steps and milestone dates to be
incorporated in the Work Plan and Schedule. Based on information provided by UDEQ in
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teleconferences on April 27, and May 2, 2011, due to the current commitment to provide
a Work Plan and Schedule for field pH, the 30-day plan and schedule for assessment is
not required for field pH exceedances.
1.0 Exceedances in Required Quarterly Sampling Wells
1.1 Quarterly Wells with Two Successive Exceedances
As indicated in the attached Table 1, the analytes discussed below exceeded their respective
GWCLs for two successive sampling periods as of the second quarter 2011. Where applicable,
the 30-day plan and schedule for assessment described above will be submitted under separate
cover for consecutive exceedances which first occurred in the second quarter of 2011. One time
exceedances are noted on Table 1, and listed below. Consecutive exceedances which occurred in
previous reporting periods are discussed in the respective Exceedance Notice for that quarter.
MW-11
Manganese concentrations exceeded the GWCL in MW-11 in the April (Q2) and May
sampling events. Manganese has periodically exceeded the GWCL in MW-11 since the
issuance of the January 20, 2010 GWDP, which established intra-well GWCLs. The
consecutive manganese exceedances noted in MW-11 were previously discussed in the
Plan and Time Schedule Under Part LGA (d), submitted to UDEQ on June 13, 2011. An
additional plan or schedule to address the Q2 exceedances is not necessary and is not
being submitted because the assessment processes and schedule have not changed since
the June 13, 2011 submission.
MW-14
• Field pH has been slighfly outside (slighfly lower than) the GWCL in MW-14 in the
April (Q2), May and June sampling events. As mentioned above, site-wide pH issues
and trends are currently under re-evaluation.
MW-25
• Field pH has been slighfly outside (slighfly lower than) the GWCL in MW-25 in the May
and June sampling events. As mentioned above, site-wide pH issues and trends are
currently under re-evaluation.
• Uranium concentrations exceeded the GWCL in MW-25 in the May and June sampling
events. This is the first consecutive exceedance for uranium in MW-25. Therefore, a
plan and schedule for assessment will be submitted under separate cover within 30 days
ofthis Exceedance Notice.
MW-26
• Chloroform in MW-26 has exceeded its GWCL for all of the monitoring periods for
2011. MW-26 is used as a pumping well for the ongoing chloroform capture program
and is expected to yield increased concentrations of chloroform.
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• Methylene chloride exceeded its GWCL in the May and June monthly sampling events.
MW-26 is used as a pumping well for the ongoing chloroform capture program and is
expected to yield increased concentrations of methylene chloride.
MW-26 Note: As stated in the September 2009 Statement of Basis (page 23) in support of the
January 20, 2010 revisions to the GWDP, "[i]t should be noted that, because MW-26 is a
pumping well for chloroform removal, concentrations of all constituents in that well are subject
to potential variation over time as a result of the pumping activity. This will be taken into
account by the Executive Secretary in determining compliance for this well." Based on
information provided by UDEQ in teleconferences on April 27, and May 2, 2011, due to the
current pumping status as part of the chloroform program, the 30-day plan and schedule for
assessment is not required at this time for exceedances of chloroform and methylene chloride in
MW-26.
Field pH has been slightly outside (slightly lower than) the GWCL in MW-26 in the
April (Q2), May and June sampling events. As mentioned above, site-wide pH issues
and trends are currently under re-evaluation.
Uranium concentrations exceeded the GWCL in MW-26 in the April (Q2) and May
sampling events. Uranium has periodically exceeded the GWCL in MW-26 since the
issuance of the January 20, 2010 GWDP, which established intra-well GWCLs. The
consecutive uranium exceedances noted in MW-26 were previously discussed in the Plan
and Time Schedule Under Part LGA (d), submitted to UDEQ on June 13, 2011. An
additional plan or schedule to address the Q2 exceedances is not necessary and is not
being submitted because the assessment processes and schedule have not changed since
the June 13, 2011 submission.
Chloride concentrations exceeded its GWCL in both the Ql and Q2 2011 sampling
events. This is the first consecutive exceedance of chloride in MW-26. However, as
mentioned above, chloride concentrations are currently under re-evaluation and a plan to
address this consecutive exceedance is not necessary and is not being submitted.
MW-30
• Nitrate + nitrite concentrations exceeded its GWCL in all sampling events during the
second quarter 2011 and during previous quarters. As mentioned above, nitrate + nitrite
concentrations are currently under re-evaluation and a plan to address this consecutive
exceedance is not necessary and is not being submitted.
• Chloride concentrations exceeded its GWCL in the consecutive samples collected in Ql
and Q2 2011. As mentioned above, chloride concentrations are currently under re-
evaluation and a plan to address this consecutive exceedance is not necessary and is not
being submitted.
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Selenium concentrations exceeded its GWCL in all sampling events during the second
quarter 2011. Selenium has exceeded the GWCL in MW-30 since the issuance of the
January 20, 2010 GWDP, which established intra-well GWCLs. The consecutive
selenium exceedances noted in MW-30 were previously discussed in the Plan and Time
Schedule Under Part IG. 4 (d), submitted to UDEQ on June 13,2011. An additional plan
or schedule to address the Q2 exceedances is not necessary and is not being submitted
because the assessment processes and schedule have not changed since the June 13, 2011
submission.
MW-31
Nitrate + nitrite concentrations exceeded its GWCL in all sampling events during the
second quarter 2011 and during previous quarters. As mentioned above, nitrate + nitrite
concentrations are currently under re-evaluation and a plan to address this consecutive
exceedance is not necessary and is not being submitted.
MW-35
Manganese concentrations exceeded the GWCL in MW-35 in the Ql and Q2 sampling
events. This is the first consecutive exceedance of manganese in MW-35. Therefore, a
plan and schedule for assessment will be submitted under separate cover within 30 days
of this Exceedance Notice. It should be noted that background has not yet been
established for MW-35 and that the interim GWCLs for MW-35 have been set at a
fraction of the Groundwater Quality Standards pending the determination of background.
Therefore, exceedance of these interim GWCLs do not necessarily represent impacts to
groundwater from Mill activities.
Uranium concentrations exceeded the GWCL in MW-35 in the Ql and Q2 sampling
events. This is the first consecutive exceedance of uranium in MW-35. Therefore, a plan
and schedule for assessment will be submitted under separate cover within 30 days ofthis
Exceedance Notice. It should be noted that background has not yet been established for
MW-35 and that the interim GWCLs for MW-35 have been set at a fraction of the
Groundwater Quality Standards pending the determination of background. Therefore,
exceedance of these interim GWCLs do not necessarily represent impacts to
groundwater from Mill activities.
1.2 Quarterly Wells with New Exceedances Reported in Q2
New exceedances for the quarterly well sampling program are listed below. The exceedances
listed will result in an accelerated sampling frequency from quarterly to monthly. It is important
to note that the wells listed below will only be sampled for those constituents which exceeded the
GWCLs during the monthly events. The wells listed below will be sampled for all constituents
listed in the GWDP during the quarterly events as that is the regularly scheduled sampling for the
quarterly wells.
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• Field pH in MW-30 was slighfly outside (lower than) the GWCL in the June sampling
event
• Field pH in MW-31 was slightly outside (lower than) the GWCL in the June sampling
event.
2.0 Exceedances in Semiannual Sampling Wells Accelerated to Quarterly
2.1 Semi-annual Wells with Two Successive Exceedances
As indicated in the attached Table 1, the analytes discussed below exceeded their respective
GWCLs for two successive sampling periods (Ql [2011] and Q2 [2011]).
MW-3
Field pH has been slightly outside (slightly lower than) the GWCL for both the Ql
sampling event and the Q2 sampling event. As mentioned above, site-wide pH issues and
trends are currently under re-evaluation, and a plan and schedule to address this
consecutive exceedance is not necessary and is not being submitted.
Selenium has exceeded the GWCL for both the Ql sampling event and the Q2 sampling
event. The consecutive selenium exceedances noted in MW-3 were previously discussed
in the Plan and Time Schedule Under Part LGA (d), submitted to UDEQ on June 13,
2011. An additional plan or schedule to address the Q2 exceedances is not necessary and
is not being submitted because the assessment processes and schedule have not changed
since the June 13, 2011 submission.
MW-18
Thallium has exceeded the GWCL for both the Ql sampling event and the Q2 sampling
event. The consecutive thallium exceedances noted in MW-18 were previously discussed
in the Plan and Time Schedule Under Part L.G A (d), submitted to UDEQ on June 13,
2011. An additional plan or schedule to address the Q2 exceedances is not necessaryand
is not being submitted because the assessment processes and schedule have not changed
since the June 13, 2011 submission.
TDS has exceeded the GWCL for both the Ql sampling event and the Q2 sampling
event. This is the first consecutive exceedance of TDS in MW-18. Therefore, a plan and
schedule for assessment will be submitted under separate cover within 30 days of this
Exceedance Notice for the TDS exceedance.
MW-24
Field pH has been slighfly outside (slighfly lower than) the GWCL for both the Ql
sampling event and the Q2 sampling event. As mentioned above, site-wide pH issues and
trends are currently under re-evaluation, and a plan and schedule to address this
consecutive exceedance is not necessary and is not being submitted.
Thallium has exceeded the GWCL for both the Ql sampling event and the Q2 sampling
event.
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• Cadmium has exceeded the GWCL for both the Ql sampling event and the Q2 sampling
event.
The consecutive thallium and cadmium exceedances noted in MW-24 were previously
discussed in the Plan and Time Schedule Under Part L.G A (d), submitted to UDEQ on June
13, 2011. An additional plan or schedule to address the Q2 exceedances is not necessary and
is not being submitted because the assessment processes and schedule have not changed
since the June 13, 2011 submission.
MW-27
Nitrate + Nitrite have exceeded the GWCL for both the Ql sampling event and the Q2
sampling event and during previous quarters. As mentioned above, nitrate + nitrite
concentrations are currently under re-evaluation and a plan to address this consecutive
exceedance is not necessary and is not being submitted.
Chloride has exceeded the GWCL for both the Ql sampling event and the Q2 sampling
event and during previous quarters. As mentioned above, chloride concentrations are
currently under re-evaluation and a plan to address this consecutive exceedance is not
necessary and is not being submitted.
TDS has exceeded the GWCL for both the Ql sampling event and the Q2 sampling
event. The consecutive TDS exceedances noted in MW-27 were previously discussed in
the Plan and Time Schedule Under Part L.G.4 (d), submitted to UDEQ on June 13, 2011.
An additional plan or schedule to address the Q2 exceedances is not necessary and is not
being submitted because the assessment processes and schedule have not changed since
the June 13, 2011 submission.
MW-28
Field pH has been slightly outside (slighfly lower than) the GWCL for both the Ql
sampling event and the Q2 sampling event and during previous quarters. As mentioned
above, site-wide pH issues and trends are currently under re-evaluation, and a plan and
schedule to address this consecutive exceedance is not necessary and is not being
submitted.
Chloride has exceeded the GWCL for both the Ql sampling event and the Q2 sampling
event and during previous quarters. As mentioned above, chloride concentrations are
currently under re-evaluation and a plan to address this consecutive exceedance is not
necessary and is not being submitted.
MW-29
Field pH has been slighfly outside (slightly lower than) the GWCL for both the Q4
sampling event and the Q2 sampling event (Q4 and Q2 are the last two consecutive
sampling events). As mentioned above, site-wide pH issues and trends are currently
under re-evaluation, and a plan and schedule to address this consecutive exceedance is
not necessary and is not being submitted.
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MW-32
• Field pH has been slightly outside (slightly lower than) the GWCL for both the Q4
sampling event and the Ql sampling event and during previous quarters. As mentioned
above, site-wide pH issues and trends are currently under re-evaluation, and a plan and
schedule to address this consecutive exceedance is not necessary and is not being
submitted.
2.1 Semi-annual Wells with New Exceedances Reported in Q2
New exceedances for the semi-annual well sampling program are listed below. The exceedances
listed will result in an accelerated sampling frequency from semi-annually to quarterly. It is
important to note that during the first and third quarterly events the wells listed below will only
be sampled for those constituents which exceeded the GWCLs because the first and third
quarterly events do not include the semi-annual well sampling program. The wells listed below
will be sampled for all constituents listed in the GWDP during the second and fourth quarter
events as that is the regularly scheduled sampling for the semi-annual wells.
• Iron in MW-29 exceeded the GWCL in the Q2 sampling event in April 2011.
If you have any questions or require any ftirther information, please contact the undersigned.
Yours truly.
Jo Ann Tischler
Director, Compliance and Permitting
cc: David Frydenlund
Ron Hochstein
Ryan Palmer
Harold Roberts
David Turk
Kathy Weinel
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Tabic 1 - GWCL Exceedances for Second Quarter 2011 under the February 15, 2011 GWDP
Ql Results^ Q2 Results Q3 Results Q4 Results
Monitoring
Well
(Water
Class)
Constituent Exceeding
GWCL
GWCL in
Jun 17,
2010
GWDP
Q"
Sample
Date
Ql Result
Q2
Sample
Date
Q2
Result
May
Monthly
Sample
Date
May
Monthly
Result
June
Monthly
Sample
Date
June
Month l>
Result
July
Monthly
Sample
Date
July
Monthly
Result
August
Monthly
Sample
Date
August
Monthly
Result
Q3
Sample
Date
Q3
Resuil
October
Monthly
Sample
Date
October
Monthly
Result
Q4
Sample
Date
Q4
Result
December
Monlhly
Sample
Date
December
Monthly
Result
Required Quarterly Sam )ling \N ells
MW-11
(Class 11)
Manganese (ug/L) 131.29 2/10/10 134 4/28/10 137 5/24/10 122 6/16/10 99 7/20/10 123 8/25/10 138 9/8/10 128 10/20/10 141 11/11/10 133 12/15/10 158 MW-11
(Class 11) Tetrahydrofuran (ug/L) II.5 2/10/10 12 4/28/10 5.2 5/24/10 <I.O 6/I6/I0 <1.0 7/27/10 2.17 8/25 10 - 1.0 9/8/10 • I.O 10/20/10 < 1.0 11/11/10 <1.0 12/15/10 <I.O
MW-14
(Class III) Field pH (S.U.) 6.5 - 8.5 2/2/10 6.45 4/21/10 6.29 5/2I/I0 6.36 6/16/10 6.45 7/20/10 7.19 8/25/10 6.48 9/8/10 6.51 10/20/10 6.60 11/10/10 6.37 12/15/10 6.47
MW-25
(Class III)
I ield pll (S.U.) 6.5 - 8.5 2/26/2010 6.53 4/28/2010 7.2 \S NA \s NA NS NA NS NA 9/8/2010 6.58 NS NA 11/10/10 6.36 NS NA MW-25
(Class III) Uranium 6.5 2/26/2010 5.93 4/28/2010 6.43 NS NA NS NA NS NA NS NA 9/8/2010 6.57 NS NA 11/10/10 5.89 NS NA
MW-26
(Class 111)
Nitrate + Nitrite (as N)
(mg/L) 0.62
2/2/10
1.3
4/22/10
2
5/21/10
0.3
6/16/10
0.4
7/21/10
0.6
8/16/10
0.6
9/26/10
0.7
10/20/10
0.4
11/15/10
0.2
12/15/10
0.4
MW-26
(Class 111)
Uranium (ug/L) 41.8
2/2/10
58.7
4/22/10
66.7
5/21/10
37.4
6/16/10
36.6
7/21/10
34.4
8/16/10
71.8
9/26/10
72.7
10/20/10
37.5
11/15/10
30.4
12/15/10
29.6
MW-26
(Class 111)
Chloroform (ug/L) 70
2/2/10
700
4/22/10
1700
5/21/10
800
6/16/10
940
7/21/10
900
8/16/10
2800
9/26/10
2100
10/20/10
1000
11/15/10
1900
12/15/10
1400
MW-26
(Class 111)
Chloride (mg/L) 58.31
2/2/10
72
4/22/10
57
5/21/10
80
6/16/10
47
7/21/10
52
8/16/10
49
9/26/10
64
10/20/10
52
11/15/10
48
12/15/10
52
MW-26
(Class 111)
Held pll (S.U.) 6.74 - 8.5 2/2/10 6.59 4/22/10 7.18 5/21/10 6.36 6/16/10 6.98 7/21/10 6.45 8/16/10 6.39 9/26/10 6.60 10/20/10 6.61 11/15/10 6.49 12/15/10 6.45 MW-26
(Class 111) Dichloromethane
(Methylene Chloride)
(ug/L)
5
2/2/10
1
4/22/10
9.9
5/21/10
NR
6/16/10
2.2
7/21/10
12
8/16/10
24
9/26/10
45
10/20/10
5.5
11/15/10
16
12/15/10
1.2
MW-26
(Class 111)
TDS (mg/L) .3284.19
2/2/10
3100
4/22/10
3280
5/21/10
NS
6/16/10
NS
7/21/10
NS
8/16/10
NS
9/26/10
3440
10/20/10
NS
11/15/10
3140
12/15/10
NS
MW-26
(Class 111)
Gross Alpha minus Rn
& U (pCi/L) 4.69
2/2/10
2.4
4/22/10
0.6
5/21/10
NS
6/16/10
NS
7/21/10
NS
8/16/10
NS
9/26/10
2.5
10/20/10
NS
11/15/10
6.4
12/15/10
NS
MW-30
(Class 11)
Nitrate + Nitrite (as N)
(mg/L) 2.5
2/9/10
16.1
4/27/10
15.8
5/21/10
17
6/15/10
15.3 7/21/10 16 8/24/10 16
9/14/10
15
10/19/10
15
11/9/10
15
12/14/10
16
MW-30
(Class 11)
Chloride (mg/L) 128 2/9/10 127 4/27/10 97 5/21/10 NS 6/15/10 NS NS NS NS NS 9/14/10 \ 11 10/19/10 NS 11/9/10 126 12/14/10 NS MW-30
(Class 11) Fidd pH (S.U.) 6.5 - 8.5
2/9/10
6.81
4/27/10
6.55
5/21/10
6.62
6/15/10
7.47 7/21/2010 6.82 8/24/10 6.73
9/14/10
6.80
10/19/10
6.77
11/9/10
6.75
12/14/10
6.65
MW-30
(Class 11)
Selenium (ug/L) 34
2/9/10
32
4/27/10 5/21/10
NS
6/15/10
NS 7/27/10 33.5 8/24/10 .?5.6
9/14/10
32.6
10/19/10
32.4
11/9/10
32.2
12/14/10
.30.5
MW-31
(Class 111)
Nitrate + Nitrite (as N)
(niR/L) 5
2/9/10
21.7
4/20/10
22.5 5/21/10 23 6/15/10 21.1 7/21/10 20 8/24/10 22
9/13/10
21 10/19/10 20
11/9/10
20
12/14/10
20
MW-31
(Class 111)
TDS(mg1) 1320
2/9/10
1150
4/20/10
1220 NS NA NS NA NS NA NS NA
9/13/10
1330 NS NA
11/9/10
1320
12/14/10
NS MW-31
(Class 111) Chloride (mg/L) 143 2/9/10 128 4/20/10 128 NS NA NS NA NS NA NS NA 9/13/10 139 NS NA 11/9/10 138 12/14/10 NS
MW-31
(Class 111)
Field pH (S.U.) 6.5 - 8.5
2/9/10
6.96
4/20/10
7.38 5/21/10 6.95 6/15/10 7.01 7/2I/I0 7.8 8/24/10 7.1
9/13/10
7.66 10/19/10 6.92
11/9/10
6.98
12/14/10
6.95
MW-31
(Class 111)
Sulfate (mg/L) 532
2/9/10
507
4/20/10
522 NS NA NS NA NS NA NS NA
9/13/10
527 NS NA
11/9/10
539
12/14/10
NS
MW-35
(Class 11)^
Manganese (ug/L) 200 NS N.A NS NA NS NA NS NA NS NA NS NA NS NA NS NA 11/30/10 698 ' NS NA MW-35
(Class 11)^ Uranium (ug/L) 7.5 NS NA NS NA NS NA NS NA NS NA NS NA NS NA NS NA
11/30/10
27.2' NS NA
Required Semi-Annual Sampling Wells
MW-2
(Class 111)
Gross Alpha minus Rn
& U (pCi/L) 3.2 NS NA 1.2 NS NA NS NA NS NA NS NA NS NA NS NA 3.5 NS NA
MW-3
(Class 111)
Selenium (ug L) 37 NS NA
5/3/10
37.2 NS NA NS NA NS NA NS NA
9/20/10
35.5 NS NA
11/19/10
38.8 NS NA MW-3
(Class 111) Field pH (S.U.) 6.5 - 8.5 NS NA 5/3/10 6.14
(6.25) NS NA NS NA NS NA NS NA 9/20/10 6.39 NS NA 11/19/10 6.35 NS NA
MW-3
(Class 111)
Fluoride (.VIg/L) 0.68 NS NA
5/3/10
0.71 NS NA NS NA NS NA NS NA
9/20/10
0.63 NS NA
11/19/10
0.77 NS NA
MW-3A
(Class 111)
Field pM (S.U.) 6.5 - 8.5 NS NA
5/4/10
6.23
(6.24) NS NA NS NA NS NA NS NA
9/21/10
6.42 NS NA
11/22/10
6.21 NS NA
MW-3A
(Class 111) Sulfate (mg/L) 3640 NS NA 5/4/10 3680 NS NA NS NA NS NA NS NA 9/21/10 3630 NS NA 11/22/10 3850 NS NA
MW-3A
(Class 111)
TDS (mg/L) 5805 NS NA
5/4/10
5860 NS NA NS NA NS NA NS NA
9/21/10
5470 NS NA
11/22/10
5330 NS NA
MW-3A
(Class 111)
Selenium (ug/L) 89 NS NA
5/4/10
81.4 NS NA NS NA NS NA NS NA
9/21/10
NS NS NA
11/22/10
94.8 NS NA
MW-5
(Class 11) Uranium (ug/L) 7.5 NS NA 4/26/10 0.39 NS NA NS NA NS NA NS NA NS NA NS NA U/Il/lO 11.6 NS NA
MW-12
(Cla.ss 111)
Field pll (S.U.) 6.5 - 8.5 NS NA 4/27/10 7.16 NS NA NS NA NS NA NS NA 9/20/10 6.62 NS NA 11/19/10 6.47 NS NA MW-12
(Cla.ss 111) Selenium (ug/L) 25 NS NA
4/27/10 25.7 NS NA NS NA NS NA NS NA 9/20/10
31.9 NS NA 11/19/10 27.6 NS NA
MW-18
(Class III)
rhalliuin (ug/l) 1.95 NS NA
5/4/10
3.73 NS NA NS NA NS NA NS NA
9/15/10
3.64 NS NA
11/18/10
3.57 NS NA
MW-18
(Class III) Sulfate (mg/L) 1938.9 NS NA
5/4/10
1950 NS NA NS NA NS NA NS NA
9/15/10
1930 NS NA 11/18/10 1910 NS NA MW-18
(Class III) Field pll (S.U.) 6.25-8.5 NS NA 5/4/10 6.2 NS NA NS NA NS NA NS NA 9/15/10 7.23 \s NA 11/18/10 6.37 NS NA
MW-18
(Class III)
TDS (mg/L) 3198.77 NS NA
5/4/10
3280 NS NA NS NA NS NA NS \A
9/15/10
3190 NS NA
11/18/10
3030 NS NA
Table 1 - GWCL Exceedances for Second Quarter 2011 under the February 15, 2011 GWDP
Ql Results Q2 Results Q3 Results Q4 Results
.Monitoring
Well
(Water
Class)
Consliluent Exceeding
GWCL
GWCL in
Curreni
GWDP
Ql
Sample
Date
Ql Result
Q2
Sample
Dale
Q2
Result
May
Month l>
Sample
Date
May
Monthly
Result
June
Month l>
Sample
Datc
June
Monthly
Result
July
Monthly
Sample
Date
Juiy
Monthly
Result
August
Monlhl>
Sample
Dale
August
Monlhly
Result
Q3
Sample
Date
Q3
Result
October
Monthly
Sample
Date
October
MonihI>
Result
Q4
Sample
Dale
Q4
Result
December
Monthly
Sample
Date
December
Monthly
Result
Required Semi-Annual Sampling Wells, continued
MW-19
(Class 111) Field pH (S.U.) 6.78-8.5 NS NA 5/4/10 6.61
(6.66) NS NA NS NA NS NA NS NA 9/15/10 6.93 NS NA 11/18/10 6.8 NS NA
MW-23
(Class 111) Field pH (S.U.) 6.5 - 8.5 NS NA 4/22/10 6.18 NS NA NS NA NS NA NS NA 9/14/10 7.05 NS NA 11/22/10 6.44 NS NA
MW-24
(Class 111)
Cadmium (ug/L) 2.5 NS NA
5/6/10
4.28 NS NA NS NA NS NA NS NA
9/21/10
5.06 NS NA
11/17/10
3.22 NS NA MW-24
(Class 111) Thallium (ug/L) 1 NS NA 5/6/10 1.3 NS NA NS NA NS NA NS NA 9/21/10 1.57 NS NA 11/17/10 1.09 NS NA MW-24
(Class 111)
Field pH (S.U.) 6.5 - 8.5 NS NA
5/6/10 5.91
(5.78) NS NA NS NA NS NA NS NA
9/21/10
6.64 NS NA
11/17/10
6.1 NS NA
MW-27
(Class 111)
Nitrate t Nitrite (as N)
(mg/L) 5.6 NS NA
5/3/10
5.8 NS NA NS NA NS NA NS NA
9/I4/I0
5.9 NS NA
11/12/10
5.7 NS NA
MW-27
(Class 111)
Chloride (mg/L) 38 NS NA
5/3/10
42 NS NA NS NA NS NA NS NA
9/I4/I0
42 NS NA
11/12/10
45 NS NA MW-27
(Class 111) Sulfate (mg/L) 462 NS NA 5/3/10 469 NS NA NS NA NS NA NS NA 9/I4/I0 461 NS NA 11/12/10 452 NS NA
MW-27
(Class 111)
1 DS (mg/L) 1075 NS NA
5/3/10
1160 NS NA NS NA NS NA NS NA
9/I4/I0
1060 NS NA
11/12/10
1110 NS NA
MW-27
(Class 111)
Gross Alpha minus Rn
& U (pCi/L) 2 NS NA
5/3/10
1.6 NS NA NS NA NS NA NS NA
9/I4/I0
NA NS NA
11/12/10
2.4 NS NA
MW-28
(Class 111)
Chloride (mg/L) 105 NS NA 4/19/10 108 NS NA NS NA NS NA NS NA 9/14/10 106 NS NA 11/12/10 107 NS NA MW-28
(Class 111) Field pH (S.U.) 6.1 - 8.5 NS NA 4/19/10 5.67 NS NA NS NA NS NA NS NA 9/14/10 5.91 NS NA 11/12/10 5.72 NS NA
MW-29
(Class 111)
Iron (ug/L) 1869 NS NA 4/27/10 1630 NS NA NS NA NS NA NS NA NS NA NS NA 11/9/10 1490 NS NA MW-29
(Class 111) Field pll (S.U.) 6.46 - 8.5 NS NA 4/27/10 6.82 NS NA NS NA NS NA NS NA NS NA NS NA 11/9/10 6.17 NS NA
MW-32
(Class 111)
Gross Alpha minus Rn
& U (pCi/L) 3.33 NS NA 4/20/10 5.4 NS NA NS NA NS NA NS NA 9/13/10 2.9 NS NA 11/IO/IO 8.8 NS NA MW-32
(Class 111) Field pll (S.U.) 6.4 - 8.5 NS NA
4/20/10
6.03 NS NA NS NA NS NA NS NA
9/13/10
6.33 NS NA
11/IO/IO
6.05 NS NA
Notes:
GWCL values are taken from February 15, 2011 version of GWDP.
NS = Not Required and Not Sampled
NR = Required and Not Reported
NA = Not Applicable
Exceedances are shown in yellow
' The revised pennit dated February 15, 2011 was received after the exceedance notice for 04 was submitted on February
~ The Ql 2011 exceedances noted here were inadvertantly omitted from the Ql Exceedance Notice submitted May 13, 201
4, 2011. It is reported here as an exceedance in this this notice, but was not reported in Q4 2010.
. No accelarated monitoring was missed as a result of the omission.
Table 1 - GWCL Exceedances for Second Quarter 2011 under the February 15, 2011 GWDP
Ql 2011 Results Q2 2011 Results
Monitoring
Well (Water
(lass)
Constitueni Exceeding
GWCL
GWCL in
Jun 17,
2010
GWDP
Januarv
2011
Monthly
Sample
Date
January
2011
Monthly
Sample
Result
QI 2011
Sample
Dale
Ql 2011
Result
March
2011
Monthly
Sample
Date
March
2011
Monlhly
Result
Q2 2011
Sample
Dale
Q2 2011
Result
May 2011
Monthly
Sample
Date
May 2011
Monthly
Result
June 2011
Monthly
Sample
Dale
June 2011
Monlhly
Result
Sample
Frequency
MW-I 1 (Class
II)
Manganese (ug/L) 131.29 l/Il/ll 121 2/2/11 145 3/15/11 68 4/4/2011 148 5/10/2011 170 6/15/2011 121 Quarterly MW-I 1 (Class
II) Tetrahydrofuran (ug/L) 11.5 l/Il/ll • 1.0 2/2/11 • 1.0 3/15/11 ! n 4/4/2011 • 1.0 5/10/2011 • 1.0 6 20 201 1 • 1.0 Quarterly
MW-14 (Class
III) Field pH (S.U.) 6.5 - 8.5 l/ll/ll 6.37 2/7/11 6.22 .3/14/11 6.76 4/4/2011 6.63 5/10/2011 6.37 6/15/2011 5.83 Quarterly
MW-25 (Class III) Field pll (S.U.) 6.5 - 8.5 1/11/11 6.44 2/2/11 6.66 3/15/11 6.79 4/4/2011 6.7 5/11/20II 6.1 6/20/2011 5.77 Quarterly MW-25 (Class III)
Uranium 6.5
1/11/11
7.02
2/2/11
4.77
3/15/11
6.8
4/4/2011
5.56
5/11/20II
6.72
6/20/2011
7.06 Quarterly
MW-26 (Cla.ss
Hi)
Nitrate + Nitrile (as N)
(mKl.) 0.62
I/I2/11
0.2
2/16/11
0.25
3/15/11
0.6
4/1/2011
0.8
5/10/2011
0.4
6/20/2011
0.3 Quarterly
MW-26 (Cla.ss
Hi)
Uranium (ug/I.) 41.8
I/I2/11
32
2/16/11
69..?
3/15/11
31.8
4/1/2011
60.2
5/10/2011
57.4
6/20/2011
18.5 Quarterly
MW-26 (Cla.ss
Hi)
Chlorofonn (ug 1.) 70
I/I2/11
800
2/16/11
730
3/15/11
1200
4/1/2011
390
5/10/2011
1900
6/20/2011
730 Quarterly
MW-26 (Cla.ss
Hi)
Chloride (mg L) 58.31
I/I2/11
52
2/16/11
59
3/15/11
64
4/1/2011
64
5/10/2011
54
6/20/2011
39 Quarterly
MW-26 (Cla.ss
Hi)
Field pll (S.U.) 6.74 - 8.5 I/I2/11 6.83 2/16/11 6.06 3/15/11 6.89 4/1/2011 6.22 5/10/2011 6.43 6/20/2011 6.52 Quarterly MW-26 (Cla.ss
Hi) Dichloromethane
(Methylene Chloride)
(uu/L)
5
I/I2/11
<1.0
2/16/11
10
3/15/11
14
4/1/2011
3.1
5/10/2011
20
6/20/2011
7 Quarterly
MW-26 (Cla.ss
Hi)
TDS (mg/L) 3284.19
I/I2/11
3100
2/16/11
3270
3/15/11
3140
4/1/2011
3310
5/10/2011
3140 3020 Quarterly
MW-26 (Cla.ss
Hi)
Gross Alpha minus Rn &
U \pCi/L) 4.69
I/I2/11
NS
2/16/11
3
3/15/11
2.7
4/1/2011
3.3
5/10/2011
.3.9 4.3 Quarterly
MW-30 (Class
II)
Nitrate Nitrite (as N)
(mn/L) 2.5
1/10/11
15
2/1/11
16
3/14/11
17
4/11/2011
16
5/10/2011
16
6/20/2011
17 Quarterly
MW-30 (Class
II)
Chloride (mg 1.) 128 1/10/11 NS 2/1/11 134 3/14/11 NS 4/11/2011 134 5/10/2011 128 6/20/2011 127 Quarterly
Quarterly
MW-30 (Class
II) Field pll (S,U.) 6.5 - 8.5
1/10/11
6.65
2/1/11
6.96
3/14/11
7.10
4/11/2011
6.83
5/10/2011
6.7
6/20/2011
5.66
Quarterly
Quarterly
MW-30 (Class
II)
Selenium (ug/L) 34
1/10/11
36.2
2/1/11
34.^
3/14/11
34
4/11/2011
44.4
5/10/2011
38.3
6/20/2011
38.7 Quarterly
MW-31 (Class
III)
Nitrate + Nitrite (as N)
(mn/l.) 5
I/IO/II
19
2/1/11
21
3/14/11
22
4/1/2011
21
5/10/2011
20
6/20/2011
22 Quarterly
MW-31 (Class
III)
TDS (mg/L) 1320
I/IO/II
1240
2/1/11
1220
3/14/11
1250
4/1/2011
1370
5/10/2011
1290
6/20/2011
1330 Quarterly MW-31 (Class
III) Chloride (mg/L) 143 I/IO/II NS 2/1/11 145 3/14/11 NS 4/1/2011 143 5/10/2011 143 6/20/2011 145 Quarterly
MW-31 (Class
III)
Field pll (S.U.) 6.5 - 8.5
I/IO/II
6.65
2/1/11
7.21
3/14/11
7.43
4/1/2011
7.01
5/10/2011
6.73
6/20/2011
6.16 Quarterly
MW-31 (Class
III)
Sulfate (mg/L) 532
I/IO/II
NS
2/1/11
538
3/14/11
531
4/1/2011
503
5/10/2011
512
6/20/2011
540 (,)uailcrly
MW-35 (Class
11)^
Manganese (ug/L) 200 NS NA 2/15/11 248 NS NA 6/7/2011 369 NS NA NS NA Quarterly MW-35 (Class
11)^ Uranium (ug/L) 7.5 NS NA
2/15/11
12.7 NS NA
6/7/2011
21.7 NS NA NS NA Quarterly
Re(|uired Semi-.-\nnual Sampling Wells
MW-2 (Class
111)
Gross Alpha minus Rn &
U (pCi/L) 3.2 NS NA l.l NS NA 4/12/2011 1.2 NS NA NS NA Semi-Annually
MW-3 (Class
III)
Selenium (ug/L) 37 NS NA
2/15/11
40.5 NS NA
4/13/2011
45.4 NS NA NS NA Sani-Annuallv MW-3 (Class
III) Field pH (S.U.) 6.5 - 8.5 NS NA 2/15/11 6.09 NS NA 4/13/2011 6.46 NS NA NS NA Semi-Annually
MW-3 (Class
III)
Fluoride (MgL) 0.68 NS NA
2/15/11
0.69 NS NA
4/13/2011
0.68 NS NA NS NA Semi-Annually
MW-3A (Class
III)
Field pH (S.U.) 6.5 - 8.5 NS NA
2/16/11
6.05 NS NA
4/13/2011
6.58 NS NA NS NA Semi-Annually
MW-3A (Class
III) Sulfate (mg/L) 3640 NS NA 2/16/11 3730 NS NA 4/13/2011 3350 NS NA NS NA Semi-Annually
MW-3A (Class
III)
TDS (mg/L) 5805 NS NA
2/16/11
5770 NS NA
4/13/2011
5720 NS NA NS NA Semi-Annually
MW-3A (Class
III)
Selenium (ug/L) 89 NS NA
2/16/11
99 NS NA
4/13/2011
85.8 NS NA NS NA Semi-Annually
MW-5 (Class 11) Uranium (ug/L) 7.5 NS NA 2/14/11 29.5 NS NA 4/12/2011 7.16 NS NA NS NA Semi-Annually
MW-12 (Class
111)
Field pH (S.U.) 6.5 - 8.5 NS NA 2/15/11 6.43 NS NA 4/5/2011 6.67 NS NA NS NA Semi-Annually MW-12 (Class
111) Selenium (ug/L) 25 NS NA 2/15/11 39 NS NA 4/5/2011 21.7 NS NA NS NA Semi-Annually
MW-18 (Class
III)
1 h.illium (ug/l) 1.95 NS NA
2/15/11
3.49 NS NA
4/6/2011
3.74 NS NA NS NA Semi-Annually
MW-18 (Class
III)
Sulfate (mg L) 1938.9 NS NA
2/15/11
1770 NS NA 4/6/2011 1780 NS NA NS NA Semi-Annually MW-18 (Class
III) Field pH(S.U.) 6.25-8.5 NS NA 2/15/11 6.27 NS NA 4/6/2011 6.71 NS NA NS NA Semi-Annually
MW-18 (Class
III)
1DS(mgI) 3198.77 NS NA
2/15/11
3250 NS NA
4/6/2011
3250 NS N \ \^ NA Semi-Annually
Table 1 - GWCL Exceedances for Second Quarter 2011 under the February 15, 2011 GWDP
Ql 2011 Results Q2 2011 Results
Monitoring
Well (Water
Class)
Constituent Exceeding
GWCL
GWCL in
Curreni
GWDP
January
2011
Monthly
Sample
Date
January
2011
Monthly
Sample
Result
Ql 2011
Sample
Date
Ql 2011
Result
March
2011
Monlhly
Sample
Datc
March
2011
Monthly
Result
02 2011
Sample
Date
Q2 2011
Result
May 2011
Monthly
Sample
Dale
May 2011
Monthly
Resuil
June 2011
Monthly
Sample
Date
June 2011
Monthly
Result
Sample
Erequency
Required Semi-Annual Sampling Wells, continued
MW-19 (Class
III) Field pH (S.U.) 6.78-8.5 NS NA 2/21/2011 6.78 NS NA 4/5/2011 7.03 NS NA NS NA Semi-Annually
MW-23 (Class
III) Field pH (S.U.) 6.5 - 8.5 NS NA 2/9/2011 6./.? NS NA 4/5/2011 7.14 NS NA NS NA Semi-Annually
MW-24 (Class
III)
Cadmium (ug/L) 2.5 NS NA
2/10/2011
2.78 NS NA
4/5/2011
2.61 NS NA NS NA Semi-Annually
MW-24 (Class
III) Thallium (ug/L) 1 NS NA 2/10/2011 1.42 NS NA 4/5/2011 1.07 NS NA NS NA Semi-Annually MW-24 (Class
III)
Field pH (S.U.) 6.5 - 8.5 NS NA
2/10/2011
5.73 NS NA
4/5/2011
6.12 NS NA NS NA Semi-Annually
MW-27 (Class
III)
Nitrate i Nitrite (as N)
(mg/L) 5.6 NS NA
2/9/2011
6 NS NA
4/5/2011
6.4 NS NA NS NA Semi-Annually
MW-27 (Class
III)
Chloride (mg/L) 38 NS NA
2/9/2011
46 NS NA
4/5/2011
43 NS NA NS NA Semi-Annually MW-27 (Class
III) Sulfate (mg/L) 462 NS NA 2/9/2011 455 NS NA 4/5/2011 442 NS NA NS NA Semi-Annual lv
MW-27 (Class
III)
1 DS (mg/L) 1075 NS NA
2/9/2011
1090 NS NA
4/5/2011
1190 NS NA NS NA Semi-Annually
Gross Alpha minus Rn &
U (pCi/L) 2 NS NA 0.7 NS NA 1.1 NS NA NS NA Semi-Annually
MW-28 (Class
III)
Chloride (mg/L) 105 NS N \ 2/14/2011 114 NS NA 4/11/2011 109 NS NA NS NA Semi-Annually MW-28 (Class
III) Field pH (S.U.) 6.1 - 8.5 NS NA 2/14/2011 5.69 ^NS NA
4/11/2011
6.01 NS NA NS NA Semi-Annually
MW-29 (Class
III)
Iron (ug/L) 1 S69 NS NA NS NA NS NA 4/18/2011 3010 NS NA NS N A Semi-Annually MW-29 (Class
III) Field pll (S.U.) 6.46-8.5 NS NA NS NA NS NA
4/18/2011
6.45 NS NA NS NA Semi-Annually
MW-32 (Class
111)
Gross Alpha ininus Rn &
U (pCi/L) 3.33 NS NA 2/9/2011 1.5 NS NA 4/1/2011 4.6 NS NA NS NA Semi-Annually MW-32 (Class
111) 1 ielil pll (S.U.) 6.4 - 8.5 NS NA
2/9/2011
5.99 NS NA
4/1/2011
6.14 NS NA NS NA Semi-Annually
Notes:
GWCL values are taken from February 15, 2011 version of GWDP.
NS = Not Required and Not Sampled
NR = Required and Not Reported
NA = Not Applieable
Exceedances are shown in yellow
• l he Ql 2011 exceedances noted here were inadvertantly omitted Irom the Ql Exceedance Notice submitted May 13, 2011. No accelarated monitoring was missed as a result of the omission.