DRC-2009-006680 - 0901a06880151522

\'j^C'.9a:fhoOu>uK
A2345?:
White Mesa Uranium Mill
DMT Performance Standard Monitoring Report
^izaz&$>
state of Utah
Groundwater Discharge Permit No. UGW370004
3^^ Quarter
July ihrough September
2009
Piepared By:
Denison Mines (USA) Corp.
1050 17th Street, Suite 950
Denver, CO. 80265
December L 2009
DMT PERFORMANCE STANDARD MONITORING REPORT
1.0 Measurements Taken During the Quarter
During lhe Quarter, the following DMT Monitoring was performed or addres.sed, as
required under Part LE.6 of the Permit:
-Weekly tailings wastewater pool elevations for tailings Cells 1,3 and 4A;
-Monthly slimes drain waier levels;
-Weekly wastewater level measurements in Robert's Pond: and
-Weekly feedstock storage area inspections.
2.0 Weekly Tailings Waste Water Pool Elevation Monitoring
Mill personnel nioniiored and recorded weekly the elevation of wastewater in Tailings Cells 1. 3
and 4A to ensure compliance with the maximum wastewater elevation criteria inandated by
Condition 10.3 of the Mill's Radioactive Materials License. These measurements were made
from an elevation survey. The results of such monitoring, reported as feel above mean sea level
(fmsl), are included in Attacliment A.
Condition 10.3 of the Mill's Radioactive Malerials License provides that freeboard limits for
Cells 1 and 3 shall be set in accordance with procedures that have been approved by the U.S.
Nuclear Regulatory Commission, Under those procedures:
(i) The freeboard limits are set as per the January 10. 1990 Drainage Repon for Cell
1 ai a liquid maximum elevation of 5,615.4 fmsl; and
(ii) The freeboard hmit [or Cell 3 i.s delermined amiually using a formula set out in
the procedure. The cuirent freeboard limit for Cell 3 was previously calculated
under this procedure at 5,601.6 fmsl. However, in UDEQ correspondence dated
November 20, 2008 an interim variance and limit was established ai 5,602.5 fmsl.
(iii) In conjunction with the variance eslablished under (ii) above, an interim
maximum elevation for C.ell4A was also established at 5.593.74
In addition, Pari LD.2 of the Permit provides that under no circumstances shall the freeboard of
any tailings cell be less than three feet, as measured from the top of the flexible membrane liner
("FML"). The top ofthe FML in Cell 1 is al 5,618.5 fmsl and the top of the FML in Cell 3 is at
5,608.5 fmsl. This means that the maximum wastewater pool elevations in Cells 1 and 3
permitted under Part LD.2 ofthe Permit are 5,615.5 and 5,605.5 fmsl. respectively.
As indicated in the table below, the waste water pool elevations in Cells 1 and 3, as measured
during the Quarter, did not exceed these regulatory standards:
Table 1 - Summary of Waste Water Pool Elevations
Tailings
Cell
Cell 1
Ceil 3
Cell 4A
Maximum
Wastewater Elevation
Measured During the
Quarter (fmsl)
5614.17
5600.11
5590.83-t-
Maximum
Wastewater Elevation
Permitted Under
License Condition
10.3 (fmsl)
5615.4
5.602.5
Maximum
Wastewater
Elevation Permitted
Under Part I.D.2 of
the Permit (fmsl)
5,615.5
5,605.5
5593.74
Note: Interim maximum elevations of 5,602.5 fmsl and 5,593.74 fmsl for Cells 3 and 4A,
respectively have been eslablished in correspondence from UDEQ dated November 20, 2008. The
maximum elevation of 5,593.74 fmsl for Cell 4A has been set assuming that the total PMP volume
for Cells 2, 3 and 4A will be accommodated in Cell 4A. By letter dated December 11, 2008 Denison
applied for an amendment to its Radioactive Materials License to set the freeboard limit for Cell 4A
at 5.593.74 fmsl and to eliminate the need to set a fi'ceboard limit for Cell 3, given that the freeboard
limit of 5,593.74 fmsl for Cell 4A is adequate lo accommodate the total PMP volume for Cells 2, 3
and 4A.
3.0 Monthly Slimes Drain Water Level Monitoring
Pursuant to Part 1.F.2 of the Groundwater Discharge Permit and correspondence from the UDEQ
dated February 7, 2008, the results of monthly recovery monitoring of the slimes drain for Cell 2 are
to be recorded and included with the results of quarterly monitoring in the Quarteriy Report. In
accordance with these requirements, the monthly readings and a graph showing the initial reading
and the final reading for each month are included as Attachment B. These readings are to be
collected during a 90 hour recovery period after the slimes drain pump has been turned off in order to
determine the static water level in the drain (head) after this short cessation in pumping.
In Part l.E.6.b) ofthe Permit this requirement shall apply to Cell 3 only upon initiation of tailings de-
watering operations. As Tailings Cell 3 is curtently an active tailings cell and de-watering operations
have not commenced, no such measurements will be made in the slimes drain access pipe for Cell 3
in the foreseeable future.
4.0 Weekly Wastewater Level Monitoring: Roberts Pond
Mill personnel monitored and recorded weekly, commencing on March 8, 2005, the effective date of
the Permit, the wastewater levels at Roberts Pond to deteiTnine compliance with the DMT operations
standards in Part LD.3. of the Pennit. Part LD.3 of the Permit provides that the water level in
Robert's Pond shall nol exceed an elevation of 5624 fmsl. The resuhs of such monitoring, reported
as feet above mean sea level (fmsl),
The maximum wastewater elevation measured in Robert's Pond during lhe quarter was 5621.51
fmsl which did not exceed the maximum permitted elevation of 5,624 fmsl.
5.0 Weekly Feedstock Storage Area Inspection
Weekly feedsiock storage area inspections were performed by the Radiation Safely Department,
commencing on March 8, 2005, the effective date of the Permit, to confirm that the bulk
feedstock materials are stored and maintained within the defmed area described in the Permit and
that all altemate feedsiock located outside the defined feedstock area are maintained within water
tight containers. The results of these inspections are recorded on the Weekly Mill Inspection
Forms, which are available at the Mill for inspection. No variance in stored materials from this
requirement or leaking altemate feedstock daims or other alternate feedsiock containers were
observed during Ihe inspections.
6.0 Cell 4A Quarterly BAT Report Information
6.1 Operational Status of LDS Pumping and Monitoring Equipment
On 9/11/09 the technician reported that a "Monitor Cell #4a Data Logger issue" had
occuired. The Data Logger has been behind in time by about 2 to 3 days. The unit was reset
and the data collector time mark was re-established.
6.2 Measurement of Weekly Fluid Head At the Lowest Point in the Secondary
Membrane
The readings pertainting to the fluid head at the lowest point in the Sectondary Membrane are
provided in Attachment A
6.3 Measurement ofthe Volume of Fluids Pumped from the LDS
The readmgs pertamting to the volume of fluids pumped are provided in Attachment A
6.4 Measurement of Weekly Wastewater Fluids in Cell 4A
Weekly fluid elevations for Cell 4A are provided in Attachment A along with elevations for
Cells 1, 3 and Roberts Pond.
7.0 Signature and Certification
This document was prepared by Denison Mines (USA) Corp. on December 1, 2009.
Denison Mines (USA) Corp.
By:
David C. Frydenlund
Vice President, Regulatory affairs and Counsel
Certification:
I certify, under penalty of law, that this document and all attachments were prepared
under my direction or supervision in accordance with a system designed to assure that qualified
persormel properly gather and evaluate the information submitted. Based on my inquiry of the
person or persons who manage tlie system, or those persons directly responsible for gathering the
information, the information submitted is, to the best of my knowledge and belief, tme, accurate
and complete./I am aware that there are significant penalties for submitting false information,
including the possibility of fine and imprisonment or knowing violations.
Davifi C Frydenlund
Vice President, Regulatory affairs and Counsel
Denison Mines (USA) Corp.
Attachment A
Tailings Ponci Elevations
3rd Quarter Elevations
Date
Free Board
7/2/2009
7/10/2009
7/17/2009
7/24/2009
7/31/2009
8/7/2009
8/14/2009
8/21/2009
8/28/2009
9/4/2009
9/11/2009
9/18/2009
9/25/2009
CelM
5615.40
5610.91
5611
5611.31
5611.79
5612.02
5612.42
5612.78
5613.13
5613.42
5613.58
5613.81
5614.01
5614.17
Cells
5601.60
5600.11
Roberts Pond
Dry
5599.78 Dry
5599.91
5599.81
5599.77
5599.65
5599.61
5599.56
5599.65
5599.59
5599.61
5599.65
5599.61
Dry
Dry
5624.00
5621.51
5621.21
5621.5
5621.25
5621.12
5621
5620.9
5620.76
5620.61
Cell 4A
5593.74
5590.83
5589.31
5585.75
5587.41
5586.8
5585.77
5585.03
5584.19
5583.44
5582.91
5582.11
5581.8
5581.07
Measurement of Fluid Head and Flow-Cell 4A 3'^'' Quarter 2009
July 2009
Date
7/2/09
7/10/09
7/17/09
7/24/09
7/31/09
Me
7.1
8.1
7.4
6.6
7.4
Measurements in Inches Flow Meter in Gallons
247922
247922
248188
248188
248583
Lowest level for the month was 6.6 inches. Total number of gallons pumped was 661.
August 2009
Date Measurements in Inches Flow Meter in Gallons
8/7/09
8/14/09
8/21/09
8/28/09
7.8
9.2
7.8
7.3
249510
250232
251210
251210
Lowest level forthe month was 7.3 inches. Total number of gallons pumped was 2627.
September 2009
Date Measurements in Inches Flow Meter in Gallons
9/4/09
9/11/09
9/18/09
9/25/09
8.8
8.5
9.3
8.9
251210
251210
251210
251210
Lowest level for the month was 8.5 inches. Total number of gallons pumped was 0.
Forthe 3'^ Quarter 2009, the lowest level was 6.6 inches and a totalof 3288 gailons were pumped.
IVIONTHLY HEAD tVIEASUREIVIENTTEST
Location: Date: 7/30/2009
Slimes Cell #2
600
700
800
900
1000
1100
1200
1300
1400
1500
1600
Sampler:
7/24/2009 7/25/2009 7/26/2009 7/27/2009
14.62
14.6
14.55
14.49
14.47
14.42
14.38
17.18 14.34
17.08 14.3
15.75 14.9
Tanner Holliday
Ryan Palmer
7/28/2009 7/29/2009
13.96 13.41
13.87 13.39
13.86 13.36
13.82 13.34
13.8 13.33
13.77 13.3
13.74 13.28
13.69 13.21
13.65 13.18
Comments: We experienced some problems with the pump once again on the 24th
during our
problems.
daily inspection. The Montliiy head test was started because of the
After the test was complete we tried to start the slimes with the rebuilt
pump, we continued to have problems with the pump. Maintenance was
contacted and they are working on getting the pump fully functionai < 3nce again.
7/30/009
13.01
13
13
13
13
13
rvlONTHLY HEAD MEASUREMENT TEST
Location: Date: 8/31/2009
Slimes
600
700
800
900
1000
1100
1200
1300
1400
1500
1600
Comments:
Cell #2
8/24/2009
25
22.19
21.04
20.14
19.27
18.39
17.73
8/25/2009
14.3
14.22
14.2
14.08
14.03
13.95
13.86
13.81
13.72
11,04 wili be used as re
it also recovered to
something to do w
Sampler:
8/26/2009
13.1
13.09
13.05
13.02
12.99
12.96
12.94
12.9
12.85
port number.
a higher level than it did in
th the various problems we
S/2 7/2009
12.51
12.49
12.46
12.45
12.43
12.41
12.38
12.36
12.33
It took longer
Tanner Hoiliday
Ryan Palmer
8/28/2009 8/29/2009
12.11
12.1
12.09
12.08
12.06
12.04
12.02
11.98
11.95
11.4
than normai to stabilize
previous months. It may have had
have been having with the pump.
S/30/2009
11.28
8/31/2009
11.04
11.04
11.04
11.04
MONTHLY HEAD MEASUREMENT TEST
Location: Date: 9/28/2009
Slimes
600
700
800
900
1000
1100
1200
1300
1400
1500
1600
Comments:
Cell # 2
9/21/2009
20.5
20.12
19.64
19.32
19.05
18.75
18.49
18.1
17.98
9/22/2009
15.48
15.37
15.35
15.34
15.34
15.19
15.03
14.98
14.92
Sampler:
9/23/2009
14.07
14.04
13.99
13.95
13.92
13.85
13.85
13.75
Two additional readings were taken
9/24/2009
13.31
13.26
13.23
13.21
13.2
13.16
13.11
13.06
13.04
Tanner Holliday
Ryan Palmer
9/25/2009 9/28/2009
12.69
12.67
12.65
12.64
12.62
12.59
12.57
12.54
12.52
11.46
11.46
11.46
11.46
over the weekend, one reading each
day. On the 26th at 1700 hrs the measurement was 12.08. On the 27th at 1600 hrs the
measurment was 11.55. The head finally stabalized on
will be used as the report i number.
the 28th at 11.46, this number
Attachment B
35
30
25
20
15
10
5
""t^Sffi^^w^
-ir T-•T-1—I—r
r~~r~r^r^rvr-rvr~^r^r~^r^i-~ooooooooooooooooooooooooCTicricricricncr)cncnCTi ooooooooooooooooooooooooooooooooo
I I I I I I 1 I L I I I I 1 I I I I I 1 i I I I I I I I I I I I I
• Final Reading —•—initial Reading
Cell 2 Slinnes Drain Fluid Elevation (ft bmp)