DRC-2011-007632 - 0901a0688029178c

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DENISO
MINES
MM
Denison Mines (USA) Corp.
105017th Street, Suite 950
Denver, CO 80265
USA
Tel: [phone]
Fax; 303389-4125
www.denlsonmlnes.com
November 30, 2011
Sent VIA Federal Express
Mr. Rusty Lundberg
Co-Executive Secretary
Utah Water Quality Board
Utah Department of Environmental Quality
195 North 1950 West
P.O. Box 144810
Salt Lake City, UT 84114-4820
Re: Transmittal of DMT Performance Standards Monitoring Report and Cell 4A and
Cell 4B BAT Performance Standards Monitoring Report for the 3rd Quarter of 2011
Dear Mr. Lundberg:
Enclosed please find two copies of the DMT Performance Standards Monitoring Report and Cell
4A and Cell 4B BAT Performance Standards Monitoring Report for the 3rd;Quarter of 2011, as
required under Parts I.F.2 and I.F.3 of the White Mesa Mill's State of Utah Groundwater
Discharge Permit No. UGW370004. Also enclosed are two CDs, each with an electronic word-
searchable copy of the enclosed Report.
If you have any questions regarding this Report, please contact the undersigned at (303) 389-
4132 or Mr. David Turk at [phone].
Yours very truly,
DENISON MINES (USA) CORP.
Jo Ann Tischler
Director, Compliance and Permitting
CC David C. Frydenlund
Ron F. Hochstein
Harold R. Roberts
David E. Turk
Kathy Weinel
OENISOJ)~~
MINES
November 30, 2011
Sent VIA Federal Express
Mr. Rusty Lundberg
Co-Executive Secretary
Utah Water Quality Board
Utah Department of Environmental Quality
195 North 1950 West
P.O. Box 144810
Salt Lake City, UT 84114-4820
Denison Mines (USA) Corp.
1050 17th Street, Suite 950
Denver, CO 80265
USA
Tel: [phone]
Fax: [phone]
www.denisonmines.com
Re: Transmittal of DMT Performance Standards Monitoring Report and Cell 4A and
Cell 4B BAT Performance Standards Monitoring Report for the 3rd Quarter of 2011
Dear Mr. Lundberg:
Enclosed please find two copies of the DMT Performance Standards Monitoring Report and Cell
4A and Cell4B BAT Performance Standards Monitoring Report for the 3rd Quarter of 2011, as
required under Parts I.F.2 and I.F.3 of the White Mesa Mill's State of Utah Groundwater
Discharge Permit No. UGW370004. Also enclosed are two CDs, each with an electronic word-
searchable copy of the enclosed Report.
If you have any questions regarding this Report, please contact the undersigned at (303) 389-
4132 or Mr. David Turk at [phone].
Yours very truly,
DENISON MINES (USA) CORP.
JoAnn Tischler
Director, Compliance and Permitting
cc David C. Frydenlund
Ron F. Hochstein
Harold R. Roberts
David E. Turk
Kathy Weinel
WHITE MESA URANIUM MILL
DMT PERFORMANCE STANDARDS MONITORING REPORT AND CELL 4A AND
CELL 4B BAT PERFORMANCE STANDARDS MONITORING REPORT
3rd Quarter
July through September
2011
State of Utah
Groundwater Discharge Permit No. UGW370004
Prepared By:
Denison Mines (USA) Corp.
1050 17th Street, Suite 950
Denver, CO. 80265
November 30, 2011
TABLE OF CONTENTS
1.0 INTRODUCTION ....••.•.•....•..•....•.•..................•.........•.....•.....................................•.•.•.•.•..•.•...••.•.•...•...•.•......• 1
2.0 MEASUREMENTS TAKEN AND MONITORING PERFORMED DURING THE QUARTER ........ 1
3.0 WEEKLY TAILINGS WASTEWATER POOL ELEVATION MONITORING .•..•.•.•.•..•.•.......•.•.•...... 2
4.0 QUARTERLY SLIMES DRAIN WATER LEVEL MONITORING •.....•.•......•.....•.•......•.•..•.•.•.......•...... 3
4.1 GENERAL ...................................................................................................................................................... 3
4.2 RESULTS FOR THE QUARTER ......................................................................................................................... 5
4.3 QUALITY ASSURANCE EVALUATION AND DATA VALIDATION ..................................................................... 5
4.4 GRAPHIC COMPARISON TO PREVIOUS yEAR ................................................................................................. 5
5.0 WEEKLY WASTEWATER LEVEL MONITORING: ROBERTS POND ............................................ 5
6.0 WEEKLY FEEDSTOCK STORAGE AREA INSPECTIONS AND INSPECTIONS OF
FEEDSTOCK MATERIAL STORED OUTSIDE THE FEEDSTOCK STORAGE AREA .•............... 5
7.0 TAILINGS CELLS AND POND LINER SYSTEM REPAIRS ................•..•.........•..•.•.•...••........•...•...•..... 6
8.0 DECONTAMINATION PADS ......................................................•.......•.•...•........•.....•.............•...•...•.•....•... 7
8.1 SUMMARY OF WEEKLY INSPECTIONS ........................................................................................................... 7
8.2 ANNUAL INSPECTION OF EXISTING DECONTAMINATION PAD ....................................................................... 8
8.3 ANNUAL INSPECTION OF NEW DECONTAMINATION PAD .............................................................................. 8
9.0 CELL 4A AND CELL 4B BAT PERFORMANCE STANDARDS REPORT FOR THE QUARTER.9
9.1 LDS MONITORING ........................................................................................................................................ 9
9.1.1 Operational Status of LDS Pumping and Monitoring Equipment ........................................................... 9
9.1.2 Measurement of Weekly Fluid Head at the Lowest Point in the Secondary FML ................................... 9
9.1.3 Measurement of the Volume of Fluids Pumpedfrom the LDS ............................................................... 10
9.2 MEASUREMENT OF WEEKLY WASTEWATER FLUIDS IN CELL 4B ................................................................ 11
9.3 SLIMES DRAIN RECOVERY HEAD MONITORING .......................................................................................... 11
10.0 CELL 1 AND CELL 3 LDS MONITORING FOR THE QUARTER ..............•...•.••.......•.•.......•.•.•.•.•.•.•...... 11
10.1 OPERATIONAL STATUS OF LDS PUMPING AND MONITORING EQUIPMENT ................................................. 11
10.2 MEASUREMENT OF THE VOLUME OF FLUIDS PUMPED FROM THE LDS ....................................................... 12
10.3 MEASUREMENT OF WEEKLY WASTEWATER FLUIDS IN CELLS 1, AND 3 ..................................................... 12
10.4 SLIMES DRAIN RECOVERY HEAD MONITORING .......................................................................................... 12
11.0 ANNUAL SLIMES DRAIN RECOVERY HEAD REPORT FOR THE CALENDAR YEAR 2011 .. 12
12.0 SIGNATURE AND CERTIFICATION ...................................................•.•....•...•.•...•.•..•.•.•.••..............•.... 13
i
LIST OF TABLES
Table I -Summary of Waste Water Pool Elevations
Table 2 -New Decontamination Pad Inspection Portal Level
ATTACHMENTS
A Tailings Cell and Roberts Pond Wastewater Elevations
B Notices Pursuant to Part I.G.3 of the GWDP
C Monthly Cell 2 Slimes Drain Monitoring Data
D Graph of Cell 2 Slimes Drain Water Levels Over Time
E Cell Liner Repair Reports and Notices
F Cell4A and Cell4B Leak Detection System Data for the Quarter and BAT O&M Plan
Tables IA and IB, Cell4A and 4B Calculations
G Annual Inspection Forms for Existing and New Decontamination Pads (Part I.F.12)
11
WHITE MESA URANIUM MILL
DMT PERFORMANCE STANDARDS MONITORING REPORT AND CELL 4A AND
CELL 4B BAT PERFORMANCE STANDARDS MONITORING REPORTS
FOR THE 3rd QUARTER OF 2011
1.0 INTRODUCTION
This is the routine Discharge Minimization Technology ("DMT") Performance Standards
Monitoring Report for the 3rd quarter of 2011 (the "Quarter") prepared by Denison Mines (USA)
Corp. ("Denison"), as required under Part IF.2 of the White Mesa Mill's (the "Mill's") State of
Utah Groundwater Discharge Permit No. UGW370004 (the "GWDP"), and the Routine Cell4A
and Cell 4B Best Available Technology ("BAT") Performance Standards Monitoring Reports for
the Quarter, as required under Part IF.3 of the GWDP.
2.0 MEASUREMENTS TAKEN AND MONITORING PERFORMED DURING THE
QUARTER
During the Quarter, the following DMT monitoring was performed or addressed, as required
under Part lD.3, lE.7, and IF.11 of the GWDP:
• Weekly tailings wastewater pool elevations for tailings Cells 1 and 3 (Part
lE.7(a));
• Quarterly slimes drain water levels in Cell 2 (Part lD.3(b)(l) and (2))1;
• Annual Slimes Drain Compliance (Part lD.3 (b) and IF.1l);
• Weekly wastewater level measurements in Roberts Pond (Part lD.3(e) and Part
lE.7(c));
• Weekly feedstock storage area inspections and inspections of feedstock materials
stored outside of the feedstock storage area (Part lD.3(f) and Parts lE.7(d) and
(e));
• Any tailings cell and pond liner system repairs (Part lE.7 (f) and Part I.E.(8)(c));
• Weekly New Decontamination Pad Inspection (Part I.E.7 (g)) and
• Annual Decontamination Pad Concrete Inspection (Part IF.1l) (not required this
reporting period)
Also during the Quarter, the following Cell 4A and 4B BAT performance standards monitoring
was performed, or addressed, as applicable and as required by Parts lE.8 and lE.12 of the
GWDP:
• Leak detection system ("LDS") monitoring for Cell 4A (Part lE.8.(a)), Cell 4B
(Part lE.12 (a)); and
I The GWDP, dated July 14,2011, Part I.D.3 (b)(2) states "effective July 11,2011, the Permittee shall conduct a
quarterly slimes drain recovery test. .. ". Weekly testing was conducted during the second quarter. The frequency
change dictated by the GWDP was implemented in the third quarter 2011.
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• Weekly tailings wastewater pool elevations for tailings Cell 4A (Part I.E.8 (a))
and Cell4B (Part I.E. 12 (a)).
3.0 WEEKLY TAILINGS WASTEWATER POOL ELEVATION MONITORING
Mill personnel monitored and recorded weekly the elevation of wastewater in Tailings Cells
during the third quarter 2011 except as noted below, to ensure compliance with the maximum
wastewater elevation criteria mandated by Parts I.E.7(a), I.E.8(a) and I.E.12(a) of the GWDP.
The results of such monitoring, reported as feet above mean sea level ("fmsl"), are included in
Attachment A. Part I.D.2 of the GWDP 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 of the FML in Cell 1 is at 5,618.5 fmsl, and the top of the FML in Cell
4B is 5600.4 fmsl. This means that the maximum wastewater pool elevations in Cells 1, and 4B
permitted under Part I.D.2 of the GWDP are 5,615.5, and 5597.4 fmsl, respectively.
The maximum wastewater pool elevations in Cells 1 and 4B, as measured during the Quarter are
summarized in the following Table 1. The requirement to meet freeboard elevation limits in Cell
3 and Cell 4A was eliminated as documented on March 14 and 15, 2011 respectively. As
indicated in Table 1, the applicable freeboard limits were not exceeded during the Quarter for
any cell.
All cells also met the maximum wastewater criteria of the Mill's State of Utah Radioactive
Materials License No. UT 1900479 (the "License") throughout the period. However, the
requirements to maintain a minimum freeboard in Cell 3 and Cell 4A were removed by the
Executive Secretary of the State of Utah Radiation Control Board (the "Executive Secretary")
during the first quarter 2011 as detailed below.
Condition 10.3 of the License provides that the freeboard limit for Cell 1 shall be set in
accordance with procedures that have been approved by the U.S. Nuclear Regulatory
Commission ("NRC"). Under those procedures the freeboard limit for Cell 1 is set as per the
January 10, 1990 Drainage Report for CellI at a liquid maximum elevation of 5,615.4 fmsl.
Condition 10.3 of the License also provides that the freeboard limit for Cells 3, 4A and 4B shall
be recalculated annually in accordance with the procedures approved by the Executive Secretary.
A letter from the Executive Secretary dated January 27, 2011 which approved the use of Ce1l4B
and a subsequent letter dated March 14, 2011, stated that authorization of the use of Ce1l4B and
approval of the DMT and Cell 4A Operations and Maintenance ("O&M") Plans effectively
eliminated the former freeboard elevation requirements for tailings Cell 3. The approvals of the
DMT and Cell 4A O&M Plans also resolved previous freeboard exceedance issues and further
stated that former issues regarding the freeboard exceedances for Cell 3 are closed-out. Pursuant
to the receipt of the March 14, 2011 letter, freeboard elevation survey measurements in Cell 3
were no longer required or conducted.
A letter from the Executive Secretary dated January 27,2011 which approved the use of Cell4B
and a subsequent letter dated March 15,2011, stated approval of the DMT and Cell4A and Cell
4B Operations and Maintenance ("O&M") Plans effectively eliminated the former freeboard
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elevation requirements for tailings Cell 4A. The approvals of the DMT and Cell 4A and 4B
O&M Plans also resolved previous freeboard exceedance issues and further stated that former
issues regarding the freeboard exceedances for Cell 4A are closed out. Pursuant to the receipt of
the March 15, 2011 letter, freeboard limits in Cell 4A were no longer required. The solution
elevation measurements in Cell 4A are required for the calculation of the daily allowable volume
of fluids pumped from the Cell4A LDS; however, the measurements were inadvertently omitted
for the first half of the third quarter. A more detailed discussion of this issue is included in
Section 9.0.
Table 1 -Summary of Waste Water Pool Elevations
Tailings Maximum Maximum Maximum
Cell Wastewater Elevation Wastewater Elevation Wastewater
Measured During the Permitted Under Elevation Permitted
Quarter (fmsl) License Condition Under Part I.D.2 of
10.3 (fms1) the GWDP (fmsl)
CellI 5611.55 5,615.40 5,615.50
Cell 3 Not Measured-No Limit No Limit
freeboard limit was (5,602.50*) (5,605.50*)
removed in Q 1 2011
Ce1l4A 5586.04 measured part No Limit No Limit
of the period. Freeboard (5,593.74**) (5,595.50**)
limit was removed in
Q12011
Cell4B 5580.61 5594.6 5597.4
* The Executlve Secretary approved the removal of the Cell 3 freeboard hmIt and authonzed the use of Cell 4B on
January 27, 2011. Cell 3 is nearly full of solids, and is undergoing pre-closure steps.
** The Executive Secretary granted a variance from the Cell 4A freeboard limit on January 13,2011, and approved
the removal of the Cell 4A limit and authorized the use of Cell 4 B on January 27, 2011. The previous freeboard limit
noted above for Cell 4A was not set out in the License. The freeboard limit of 5,593.74 for Ce1l4A was set out in a
letter from the Executive Secretary dated November 20, 2008. The approved DMT Plan, Revision dated November
1.1 dated January 2011, included the removal of the freeboard limit for Cell 4A to be replaced by a freeboard limit
for Ce1l4B that will accommodate the freeboard requirements of Cells 2, 3, 4A, and 4B .
4.0 QUARTERLY SLIMES DRAIN WATER LEVEL MONITORING
4.1 General
Part I.D.3(b)(l) of the GWDP provides that the Permittee shall at all times maintain the average
wastewater recovery head in the slimes drain access pipes of each of Cells 2 and 3 to be as low
as is reasonably achievable, in accordance with the DMT Plan. Part I.D.3(b)(3) of the GWDP
provides that for Cell 3, this requirement shall apply after initiation of dewatering operations.
Part I.D.6(c) of the GWDP provides that, after the Permittee initiates pumping conditions in the
slimes drain layer in Cell 4A, the Permittee will provide: 1) continuous declining fluid heads in
the slimes drain layer, in a manner equivalent to the requirements found in Part I.D.3(b), and 2) a
maximum head of 1.0 feet in the tailings (as measured from the lowest point of the upper FML)
in 6.4 years or less. Similarly, Part I.D.13( c) of the GWDP provides that, after the Permittee
3
initiates pumping conditions in the slimes drain layer in Cell 4B, the Permittee will provide: 1)
continuous declining fluid heads in the slimes drain layer, in a manner equivalent to the
requirements found in Part I.D.3(b), and 2) a maximum head of 1.0 feet in the tailings (as
measured from the lowest point of the upper FML) in 5.5 years or less.
The GWDP, dated July 14, 2011, Part I.D.3 (b)(2) states "effective July 11, 2011, the Permittee
shall conduct a quarterly slimes drain recovery test. .. ". Weeki y testing was conducted during
the second quarter. The frequency change dictated by the GWDP was implemented in the third
quarter 2011. The test ensures that each tailings cell that meets the following minimum
requirements: 1) includes a duration of at least 90-hours, as measured from the time that
pumping ceases, and 2) achieves a stable water level at the end of the test, as measured by three
consecutive hourly water level depth measurements, with no change in water level, as measured
to the nearest 0.01 foot.
At this time, dewatering operations have not commenced in Cell 3, Cell 4A, or Cell 4B. As a
result, the requirements in Part 1.E.7(b) to monitor and record monthly the depth to wastewater in
the slimes drain access pipes as described in Part I.D.3 of the GWDP apply only to Cell 2 at this
time. Accordingly, this Report is limited to slimes drain recovery head information relating to
Cell 2 only.
Pursuant to Parts 1.E.7(b) and I.F.2 of the GWDP, Section 8.2 of the DMT Plan and
correspondence from DRC, dated February 7, 2008, the results of monthly (now quarterly)
recovery monitoring of the slimes drain for Cell 2 are to be recorded and included with the
results of quarterly monitoring in the quarterly White Mesa Mill DMT Performance Standards
Monitoring Report and Cell 4A and Cell 4B BAT Performance Standards Monitoring Reports
(the "DMT Reports"). Further, beginning in 2008, qumterly DMT RepOlts must include both the
current year values and a graphic comparison to the previous year. An annual slimes drain
recovery head report, that addresses the requirements of Part 1.F.11 of the GWDP and Section
8.2 of the DMT Plan must be included in the 4th quarter DMT Report.
The requirement in Section 3.1(b)(v) of the DMT Plan to monitor the depth to wastewater in the
Cell 2 slimes drain access pipe weekly to determine maximum and minimum fluid head is a
requirement of the License and is not a DMT performance monitoring standard required by Parts
I.D.3 or I.E.7 of the GWDP and hence is not required to be included in the routine DMT
Performance Standards Monitoring Report under Part 1.F.2 of the GWDP. Denison has included
in Attachment C, the information requested by DRC for completeness and as noted in the
Denison letter dated November 14, 2011. However, as stated in the November 14, 2011 letter,
Denison intends to revise the DMT Plan by preparing two separate plans for the GWDP and the
License requirements. Following approval of the plans, Denison proposes to continue providing
quarterly DMT reports addressing the GWDP DMT requirements only. Until such time as the
separate plans are approved, Denison will continue to include a summary table of this License-
required information in the DMT report for DRC convenience.
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4.2 Results for the Quarter
In accordance with these requirements, the quarterly slimes drain recovery head monitoring data
for the Quarter, which includes the date and time for the start and end of the recovery test, the
initial water level, and the final depth to stable water level, as well as a weekly summary data
table for the slimes drain liquid levels for the Quarter required under the License, are included as
Attachment C to this Report.
4.3 Quality Assurance Evaluation and Data Validation
Denison management has evaluated all slimes drain data collected, data collection methods, and
all related calculations required by the GWDP, and have verified the accuracy and reliability of
both the data and calculations reported.
As a result of its quality assurance evaluation and data validation review, Denison has concluded
that all of the 2009, 2010 slimes drain tailings fluid elevation measurements and the 2011
monthly (through June) and quarterly (July forward) slimes drain tailings fluid elevation
measurements to date meet the test performance standards found in Part LD.3(b )(2) of the
GWDP and can be used for purposes of determining compliance with the requirements of Part
I.D.3(b)(2) of the GWDP.
4.4 Graphic Comparison to Previous Year
A graph showing the final depth to stable water level readings for each month in 2009 through
2011 (quarterly beginning in July 2011), for which validated data is available (see Section 4.3
above), is included as Attachment D, which shows a graphic comparison of this Quarter's data to
data for 2009 and 2010.
5.0 WEEKLY WASTEWATER LEVEL MONITORING: ROBERTS POND
During the Quarter, Mill personnel monitored and recorded weekly the wastewater levels at
Roberts Pond to determine compliance with the DMT operations standards in Part LD.3(e) of the
GWDP. Part LD.3(e) of the GWDP provides that the water level in Roberts Pond shall not
exceed an elevation of 5,624 fms!'
The maximum wastewater elevation measured in Robert's Pond during the quarter was 5,622.78
fmsl, which did not exceed the maximum permitted elevation of 5,624 fms!' The results of such
monitoring are included in Attachment A.
6.0 WEEKL Y FEEDSTOCK STORAGE AREA INSPECTIONS AND INSPECTIONS
OF FEEDSTOCK MATERIAL STORED OUTSIDE THE FEEDSTOCK STORAGE
AREA
Weekly feedstock storage area inspections were performed by the Mill's Radiation Safety
Department, to confirm that the bulk feedstock materials are stored and maintained within the
defined area described in the GWDP and that all alternate feedstock located outside the defined
5
feedstock area is maintained within containers that comply with the requirements of Part I.D.11
of the GWDP. The results of these inspections are recorded on the Weekly Mill Inspection
forms, which are available at the Mill for inspection. Two items were noted during the second
quarter inspections. During the weekly inspections conducted on July 15, 2011, July 22, 2011,
July 28, 2011, September 2, 2011, September 9, 2011 , September 16, 2011, standing water was
noted in the feedstock storage areas. The water was the result of heavy rains. No corrective
actions were necessary as the areas where water was noted are sloped towards a drainage sump
that allows the water to drain to Cell 1. The remaining water noted was a small amount which
remained after the majority of the rain water had drained. The second item noted in the
inspections on July 8, 2011 and August 26, 2011 was that the Old Decon Pad sump was
overflowing into the containment area. The pumps were turned on and the excess fluid was
pumped to CellI. The Old Decon Pad is not used constantly and the collected fluids are pumped
when needed. The pumps which carry the fluid to Cell 1 are not kept on since the old Decon Pad
is used infrequently. When necessary, the fluids are pumped to Cell 1. No other items were
noted during the third quarter inspections.
7.0 TAILINGS CELLS AND POND LINER SYSTEM REPAIRS
The liner systems at Cells 1, 2, 3, 4A, and 4B were inspected on a daily basis pursuant to the
requirements of Sections 2.1 and 2.2 of the Mill's DMT Plan. The results of those inspections
are recorded on the Mill's Daily Inspection Data sheets, which are available at the Mill for
review. A visual inspection of Roberts Pond was performed on a weekly basis. The results of
those inspections are recorded on the Weekly Mill Inspection forms, which are available at the
Mill for review.
In accordance with Part I.E.7(f) of the GWDP, in the event that any liner defect or damage is
identified during a liner system inspection, the Mill shall immediately implement the currently
approved Liner Maintenance Provisions. Further, Part I.F. 2 of the GWDP provides that when a
liner repair is performed at any tailings cell or at Roberts Pond, a Repair Report shall be prepared
and included with the next quarterly DMT report.
Mill personnel detected an accumulation of fluid in the LDS standpipe of Cell 1 on Wednesday,
June 2, 2010. Transfer of fluids from Cell 1 to Cell 4A to lower the Cell 1 level sufficiently to
detect and repair any damage began on June 2, 2010. Maintenance identified some FML damage
and performed repairs during the period when the level was lowest. Following the repairs, the
level was allowed to gradually return to its June 3 level of 5614.57 feet and the LDS remained
dry until, after a period of heavy rains in late July and early August (and an increase in the
solution in level in Cell 1), a recurrence of the LDS liquid level was identified on August 7,
2010. At that time, the Mill resumed pumping Cell 1 to Cell4A to lower the solution level.
During discussions on August 12, 2010, DRC personnel agreed with Denison that both the June
and August identifications of LDS solutions were part of one event. The temporary cessation of
flow into the LDS between June and August detections may have resulted from lowering the
solution level to a point below some tears or damage that were not identified during the July
repair efforts. Denison submitted to DRC a plan and schedule for inspection and repair, if
necessary, of the inside slope areas of the Cell 1 FML above the 5613 foot level, on August 18,
6
2010, and an updated plan on August 30, 2010. DRC conditionally approved the updated plan
in a letter dated September 22, 2010. The updated plan commits to completion of the repairs by
July 31,2012.
The September 22, 2010 DRC letter and Part 1.F.2 of the GWDP require that the repairs be
documented in a liner repair report which shall be included with the next quarterly DMT report,
that is, in the DMT Report following completion of the repairs to be reported. Consistent with
the proposed date for completion of repairs in July 2012, Denison will include the required repair
report with the third quarter DMT report to be submitted on December 1,2012.
During the Quarter, no liner repairs were performed at any of the Mill's tailings cells other than
Cell 1. Consistent with the approved repair plan and schedule, repairs to the Cell 1 FML were
conducted during the months of September and October 2010, and ceased during the months of
November and December 2010. Repairs to the Cell 1 liner resumed in April 2011 and stopped in
October 2011 for the winter.
8.0 DECONTAMINATION PADS
8.1 Summary of Weekly Inspections
Part 1.F.7 (g) of the GWDP and Section 3.1 of the DMT Plan require that a weekly inspection of
the New Decontamination Pad be performed, including that the vertical inspection portals on the
New Decontamination Pad which are located between the primary and secondary containments
be visually observed on a weekly basis as a means of detecting any leakage from the primary
containment into the void between the primary and secondary containments. The BAT
performance standards for the New Decontamination Pad are set out in Part I.D.14 of the
GWDP. The New Decontamination Pad was placed into service on March 22,2010. Use of the
New Decontamination Pad was temporarily suspended during the second quarter 2010 as a result
of a cease and desist order from DRC dated May 18, 2010. Because the New Decontamination
Pad was not in use after the second quarter 2010, the weekly inspections of the containments
were stopped for the remainder of 2010. The Executive Secretary provided authorization for use
of the New Decontamination Pad in a letter dated February 1, 2011. Use of the New
Decontamination Pad resumed in February 2011 and the weekly inspections were resumed as
required.
Table 2 below indicates the water level measurements in each portal measured during the 3rd
quarter 2011.
7
Table 2 -New Decontamination Pad Inspection Portal Level for the Third Quarter 2011
Portal 1 Portal 2 Portal 3
Liquid Level Liquid Level Liquid Level
Date (in Feet)1 (in Feet) (in Feet)
7/812011 0.00 0.00 0.00
7115/2011 0.00 0.00 0.00
7/22/2011 0.00 0.00 0.00
7/29/2011 0.00 0.00 0.00
8/512011 0.00 0.00 0.00
811212011 0.00 0.00 0.00
8119/2011 0.00 0.00 0.00
8/26/2011 0.00 0.00 0.00
9/212011 0.00 0.00 0.00
919/2011 0.00 0.00 0.00
9116/2011 0.00 0.00 0.00
9/23/2011 0.00 0.00 0.00
9/3012011 0.00 0.00 0.00
As can be seen from the foregoing table, no fluids were observed to be present in any of the
portals during the third quarter.
Any soil and debris identified during the weekly inspections was removed from the wash pad of
the New Decontamination Pad, in accordance with part ID.14 (a) of the GWDP and Section 3.1
(e)(i)(F) of the DMT Plan. No cracks greater than 1/8" were observed during any weekly
inspections.
8.2 Annual Inspection of Existing Decontamination Pad
As required by Part IF.12 of the Permit, annual inspections of the existing decontamination pad
must be conducted during the second quarter of each year. The documentation for the 2011
annual inspections was reported in the Second Quarter DMT report submitted August 31, 2011.
The 2012 annual inspection will be conducted during the second quarter of 2012.
8.3 Annual Inspection of New Decontamination Pad
As previously stated, the New Decontamination Pad was placed into service on March 22, 2010.
Use of the New Decontamination Pad was temporarily suspended as a result of a cease and desist
order from DRC dated May 18,2010. DRC's approval for use of the New Decontamination Pad
was granted on February 1, 2011, following submittal of revisions to the DMT Plan and DRC.
observation of hydrostatic testing of the in-ground water holding tanks. Revisions to the DMT
Plan were submitted by Denison on November 12, 2010 and reviewed by DRC. Hydrostatic
testing was re-performed from November 24 to 26, 2010 following a W-day advanced notice to
DRC on November 12, 2010. The Executive Secretary provided an authorization for use of the
New Decontamination Pad in a letter dated February 1, 2011. Use of the New Decontamination
Pad resumed in February 2011.
8
Annual inspections of the new decontamination pad will be conducted during the second quarter
of each year. The documentation for the annual inspections was reported in the Second Quarter
DMT report submitted August 31, 2011. The 2012 annual inspection will be conducted during
the second quarter of 2012.
9.0 CELL 4A AND CELL 4B BAT PERFORMANCE STANDARDS REPORT FOR
THE QUARTER
This Section constitutes the routine Cell 4A and Cell 4B BAT Performance Standards
Monitoring Report for the Quarter, as required under Part 1.F.3 of the GWDP.
9.1 LDS Monitoring
9.1.1 Operational Status of LDS Pumping and Monitoring Equipment
The LDS pumping and monitoring equipment for each of Cell 4A and Cell 4B, including, but not
limited to, the submersible pump, pump controller, head monitoring, and flow meter equipment,
operated continuously during the Quarter except as noted below and as detailed in the Notice
pursuant to Part I.G.3 of the GWDP which is included in Attachment B of this report.
Ce1l4A
There was one failure of the monitoring equipment in Cell 4A LDS which was not made
operational within 24-hours of discovery, as contemplated by Part I.E.8(a)(1) of the GWDP for
Cell 4A. It is important to note that the pumping equipment for Cell 4A LDS remained fully
operational throughout the quarter, but the electronic data logging equipment associated with the
Cell 4A LDS malfunctioned during the quarter. Detailed information regarding the root cause,
corrective actions and the affirmative defense surrounding this issue are included in the Notice
pursuant to Part I.G.3 of the GWDP which was submitted to UDEQ on July 6, 2011 and is
included in Attachment B of this report.
No data were lost as the result of the data capture system malfunction. The data are manually
recorded daily by the Mill Environmental Technicians. The manual data captured during the
daily inspections are used for all compliance determinations.
Ce1l4B
During the Quarter, there were no failures of any pumping or monitoring equipment not repaired
and made fully operational within 24-hours of discovery, as contemplated by Part I.E.8(a)(1) for
CeIl4B.
9.1.2 Measurement of Weekly Fluid Head at the Lowest Point in the Secondary FML
The readings pertaining to the fluid head above the lowest point in the secondary FML for Cells
4A and 4B are provided in Attachment F.
9
As can be seen from a review of Attachment F, at no point in the Quarter did the fluid head in the
Cell 4A LDS sump exceed a I-foot level above the lowest point in the lower FML on the Cell
floor (where for purposes of compliance monitoring this I-foot distance equates to 2.28 feet
above the LDS system transducer), as stipulated by Part I.E.8(a)(2) of the GWDP. During the
Quarter, the fluid head in the Cell 4A LDS sump did not exceed 12.4 inches above the LDS
transducer.
As can be seen from a review of Attachment F, at no point in the Quarter did the fluid head in the
Cell 4B LDS sump exceed a I-foot level above the lowest point in the lower FML on the Cell
floor, as stipulated by Pmt I.E.12(a)(2) of the GWDP. For the purposes of compliance
monitoring this I-foot distance equates to 2.25 feet above the LDS system transducer. During
the quarter the fluid head in Cell 4B sump did not exceed 11.59 inches above the LDS
transducer.
9.1.3 Measurement of the Volume of Fluids Pumpedfrom the LDS
The readings pertaining to the volume of fluids pumped are provided in Attachment F.
Ce1l4A
As can be seen from a review of Attachment F, a total of 260 gallons were pumped from the Cell
4A LDS for the third quarter of 2011. Based on this measured value, the average daily LDS flow
volume in Cell 4A could not possibly have exceeded 24,160 gallons/day, as stipulated by Part
I.E.8(a)(3) of the GWDP, and in fact averaged no more than 2.86 gallons per day for 91 days.
Daily allowable volume of fluids pumped from the Cell 4A LDS have also been calculated based
on weekly tailings cell fluid measurements using the calculations provided in the Cell 4A BAT
Operations and Maintenance Plan. A letter from the Executive Secretary dated January 27,
2011 which approved the use of Cell 4B, and a subsequent letter dated March 15, 2011, stated
approval of the DMT and Cell 4A Operations and Maintenance ("O&M") Plans and effectively
eliminated the former freeboard elevation requirements for tailings Cell 4A. Pursuant to the
receipt of the March 15, 2011 letter, freeboard limits in Cell 4A were no longer required.
Denison corporate staff misinterpreted this waiver as meaning that the weekly wastewater
elevations no longer needed to be conducted. As a result, these measurements were not collected
during the first half of the third quarter. Therefore, the allowable daily limit of the volume of
fluids pumped from the Cell 4A LDS was calculated from elevation measurements collected
starting the week of August 26, 2011, Based on the wastewater pool elevation surveys conducted
during the second half of the the quarter, the maximum head recorded on the FML during the
Quarter of about 30 feet, the allowable flow rate would be approximately 544 gallons/acres/day,
as determined under the Mill's Cell 4B BAT Operations and Maintenance Plan, Table lA (also
included in Attachment F of this report), and assuming a liner elevation of 5555.55 feet and
approximately 38 acres of liquid area. The average daily flow volume in Cell 4A did not exceed
the calculated flow volume of 20,667 gallons/day. During third quarter 2011, a total of 260
gallons were pumped from Cell 4A LDS during the entire period, or an average of 2.86 gallons
per day. The third quarter allowable flow rate calculation for Cell 4A is included in Attachment
F of this report.
10
Ce1l4B
Based on the wastewater pool elevation surveys conducted during the quarter, the maximum
head recorded on the FML during the Quarter was about 24 feet. The allowable flow rate would
therefore be approximately 475.6 gallons/acres/day, as determined under the Mill's Ce1l4B BAT
Operations and Maintenance Plan, Table IB (also included in Attachment F of this report), and
assuming a liner elevation of 5557.5 feet and approximately 31.5 acres of liquid area. The
average daily flow volume in Cell 4B did not exceed the calculated flow volume of 14,981
gallons/day. During third quarter 2011, a total of 234 gallons were pumped from Cell 4B LDS
during the entire period, or an average of 2.57 gallons per day. The third quarter allowable flow
rate calculation for Cell4B is included in Attachment F of this report.
9.2 Measurement of Weekly Wastewater Fluids in Ce1l4B
Weekly fluid elevations for Cell 4B, except as noted for the beginning of the quarter are
provided in Attachment A along with elevations for Cell 1 and Roberts Pond.
9.3 Slimes Drain Recovery Head Monitoring
As the Mill has not initiated pumping conditions in the Cell 4A or Cell 4B slimes drain system at
this time, monthly recovery head tests and fluid level measurements are not required to be made
at this time pursuant to Part I.E.8(b) of the GWDP.
10.0 CELL 1 AND CELL 3 LDS MONITORING FOR THE QUARTER
The requirement in Section 3.1(a) of the DMT Plan to monitor the LDS for Cells 1 and 3 is a
requirement of the License and is not a DMT performance monitoring standard required by Parts
I.D.3 or I.E.7 of the GWDP and hence is not required to be included in the routine DMT
Performance Standards Monitoring Report under Part 1.F.2 of the GWDP. Denison has included
in Attachment F, the information requested by DRC for completeness and as noted in the
Denison letter dated November 14, 2011. However, as stated in the November 14, 2011 letter,
Denison intends to revise the DMT Plan by preparing two separate plans for the GWDP and the
License requirements. Following approval of the plans, Denison proposes to continue providing
quarterly DMT reports addressing the GWDP DMT requirements only. Until such time as the
separate plans are approved, Denison will continue to include a summary table of this License-
required information in the DMT report for DRC convenience.
10.1 Operational Status of LDS Pumping and Monitoring Equipment
The LDS pumping and monitoring equipment for each of Cells 1, 2, and 3, including, but not
limited to, the submersible pump, pump controller, head monitoring, and flow meter equipment,
operated continuously during the Quarter except as noted below.
11
For Cell 1, during the third Quarter, there were no failures of any pumping or monitoring
equipment not repaired and made fully operational within 24-hours of discovery.
For Cell 3, during the third Quarter, there were no failures of any pumping or monitoring
equipment not repaired and made fully operational within 24-hours of discovery.
10.2 Measurement of the Volume of Fluids Pumped from the LDS
No fluids were pumped from the Cell 1 or 3 LDSs during the quarter because no fluids were
detected in either the Cell 1 or Cell 3 LDS.
10.3 Measurement of Weekly Wastewater Fluids in Cells 1, and 3
A summary of the fluid elevations for the Cell 1 and 3 LDSs for the quarter are provided in
Attachment F. The LDS for Cells 1 and 3 were dry during the quarter.
10.4 Slimes Drain Recovery Head Monitoring
As the Mill has not initiated pumping conditions in the Cell 1 or Cell 3 slimes drain system at
this time, monthly recovery head tests and fluid level measurements are not required to be made
at this time.
11.0 ANNUAL SLIMES DRAIN RECOVERY HEAD REPORT FOR THE
CALENDAR YEAR 2011
The annual slimes drain recovery head report for Cell 2 for calendar year 2011 (the "Period"), as
required under Parts I.D.3 (b) and I.P.11 of the GWDP and Section 8.2 of the DMT Plan will be
included with the 4th quarter DMT report which will be submitted on or before March 1,2012.
12
12.0 SIGNATURE AND CERTIFICATION
This document was prepared by Denison on November 30,2011.
By:
David . F Y en lund
Vice President, Regulatory Affairs and Counsel
13
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 personnel
properly gather and evaluate the information submitted. Based on my inquiry of the person or
persons who manage the system, or those persons directly responsible for gathering the
information, the information submitted is, to the best of my knowledge and belief, true, accurate
and complete. I am aware that there are significant penalties for submitting false information,
includi he p sibility of fine and imprisonment for knowing violations.
Davi . r enlund
Vice resident, Regulatory affairs and Counsel
Denison Mines (USA) Corp.
14
Attachment A
Tailings Pond Elevations
3rd Quarter Elevations
Date Cell 1 Cell 3 2 Roberts Pond Cell 4A 3 Cell 484
Free Board 1 5615.40 5602.50 5624.00 5593.74 5594.60
Inadvertently
7/8/2011 5611.55 No longer required Dry omitted 5580.61
Inadvertently
7/15/2011 5611.44 No longer required Dry omitted 5580.44
Inadvertently
7/22/2011 5611.40 No longer required Dry omitted 5580.41
Inadvertently
7/29/2011 5611 .22 No longer required Dry omitted 5580.26
Inadvertently
8/5/2011 5611.17 No longer required Dry omitted 5580.15
Inadvertently
8/12/2011 5611.05 No longer required Dry omitted 5579.95
Inadvertently
8/19/2011 5610.99 No longer required Dry omitted 5579.83
8/26/2011 5610.90 No longer required Dry 5585.94 5579.73
9/2/2011 5610.76 No longer required 5619.92 5585.94 5579.92
9/9/2011 5610.70 No longer required 5622.78 5585.79 5579.45
9/16/2011 5610.80 No longer required 5621.15 5585.96 5579.49
9/23/2011 5610.80 No longer required 5620.04 5586.04 5579.45
9/30/2011 5610.72 No longer required 5619.52 5535.92 5579.25
I Freeboard as permitted under License condition 10.3 is no longer applicable to Cell 3 or Cell 4A.
2Cell 3 is nearly full of solids, is undergoing pre-closure steps, and the freeboard limit specified here is no longer
required and the weekly measurements are no longer required per the January 27 and March 14, 2011 letters from
DRC.
3 The freeboard limit for Cell4A is not set out in the License. The freeboard limit of 5,593.74 for Cell4A is set out
in a letter from the Executive Secretary dated November 20,2008. Denison proposed in the DMT Plan revision
dated November 12, 2010 the removal of the freeboard limit for Cell4A to be replaced by a freeboard limit for new
Cell4B that will accommodate the freeboard requirements of Cells 2, 3, 4A, and 4B. The Executive Secretary
granted a variance from the Cell4A freeboard limit on January 13,2011 and approved the removal of the Cell4A
limit and the use of Cell 4B on January 27, 2011. The weekly measurements are no longer required for compliance
with freeboard limts. The measurements have resumed in Q3 2011 to complete the daily leakage rate for Ce1l4A.
4 The freeboard limit listed is the value specified in the DMT plan when the pool surface area is 40 acres. A pool
surface area of 40 acres is used because there are no beaches present in Cell4B at this time.
Attachment B
July 6,2011
VIA E-MAIL AND OVERNIGHT DELIVERY
Rusty Lundberg, Co-Executive Secretary
Utah Water Quality Board
Utah Department of Environmental Quality
195 North 1950 West
P.O. Box 144810
Salt Lake City, UT 84114-4810
Denison Mines (USA) Corp.
1050 17th Street, Suite 950
Denver, CO 80265
USA
Tel: 303628·7798
Fax: [phone]
www.denisonmines.com
Re: State of Utah Ground Water Discharge Permit No. UGW370004 White Mesa Uranium Mill -
Notice Pursuant to Part I.G.3 of the Permit and UAC R317-6-6.16(C)
Dear Mr. Lundberg:
Please take notice pursuant to Part I.G.3 of the White Mesa Mill's (the "Mill's") State of Utah Groundwater
Discharge Permit No. UGW370004 (the "Permit") and Utah Administrative Code ("UAC") R313-6-6.16(C) that
Denison Mines (USA) Corp. ("Denison"), as operator of the Mill and holder of the Permit, failed to meet the
Best Available Technology ("BAT") standards in Part 1.E.8.a.1 of the Permit, by not providing continuous
operation of the Cell 4A leak detection system ("LOS") data recording equipment, as described in more detail
below.
This failure was discovered on Monday, June 27, 2011. Initial notice of this failure to maintain BAT was given
by telephone to Mr. David Rupp of the Utah Department of Environmental Quality at 3:30pm on Wednesday
June 28, 2011 at 801-536-4023 (within 24 hours of the discovery).
1. Facts and Background Information
a) The Cell 4A LOS instrumentation was installed in August 2008 .
b) Section I.E.8.a.1 of the Permit requires that "the Permittee shall provide continuous operation of the
leak detection system pumping and monitoring equipment, including, but not limited to, the
submersible pump, pump controller, head monitoring, and flow meter equipment approved by the
Executive Secretary. Failure of any LOS pumping or monitoring equipment not repaired or made fully
operational within 24-hours of discovery shall constitute a failure of BAT, and a violation of this
permit."
c) The Mill identified on June 27, 2011, at the time of the weekly tailings inspection, that the electronic
LOS log was not operating, and determined from review of the data log that it had not operated since
June 3, 2011.
N:\Notices,\Cell 4A LOS notice 07.06.11\07.06.11 Notice to RLundberg Cell fl-A LOS data.doc
Letter to Mr. Rusty Lundberg
July 6,2011
Page 2
d) At the time of discovery, Mill environmental personnel immediately rebooted the data computer, reset
the system, and data logging resumed.
e) The data logging system computer and data storage flash drive have the capacity to store
approximately six weeks of data.
f) Mill environmental technicians manually record the same data daily during daily tailings inspections.
That is all data relative for SAT compliance was manually recorded even during the periods of
electronic data outage.
g) Environmental technicians have historically encountered periods when data could not be
downloaded from the Cell 4A LOS storage device. Environmental technicians were under the
mistaken impression that the system required time for data uploads from the level sensor to the data
computer, during which downloads were not feasible.
h) During the period from June 3 to June 27, encompassing three weekly attempts at the LOS data
download, environmental technicians assumed at each unsuccessful attempt that the system was
uploading, and that data was being stored for collection during a subsequent week. Further
inspection on June 27 identified that the system was not uploading, but had stopped recording.
i) Following the initial discovery of the system malfunction, Mill environmental personnel monitored the
system more closely in order to diagnose the cause of the shutdown. The data logger continued to
have the same problems with electronic shutdowns that required rebooting and resetting as follows:
Date system Days of Date of Days of
rebooted operation before malfunction missing data
malfunction before next
identified
June 27 2 June 29 2
July 1 4 July 5 1
2. Actions Taken
Upon identification of the initial malfunction, Denison took the following actions:
a) Mill environmental personnel notified Denison Corporate environmental staff;
b) The data computer was rebooted and the logger reset; and
c) Environmental technicians observed the system more frequently to confirm whether the correction
had rectified the malfunction, that is, whether the system would run continuously.
When the more frequent monitoring identified the recurring malfunction, Denison took the following actions:
a) Mill environmental personnel notified Denison Corporate environmental staff;
b) Mill environmental technicians contacted the manufacturer's technical team for assistance in
diagnosing the cause of the malfunction;
a)ENISONI)J~
MINES
Letter to Mr. Rusty Lundberg
July 6,2011
Page 3
c) Mill environmental personnel developed a stepwise approach for isolating the cause of repeqted
system failure, as described in Section 4, below.
3. Root Cause
The root cause analysis is as follows:
a) Environmental technicians have historically encountered periods when data could not be downloaded
from the Cell 4A LDS storage device. Environmental technicians were under the mistaken
impression that the system required time for data uploads from the level sensor to the data computer,
during which downloads were not feasible. Environmental technicians were also aware that the
storage system could maintain up to six weeks of data, and assumed that because data was being
stored for multiple weeks, it was sufficient to return the following week for the data that could not be
downloaded.
b) During the period from June 3 to June 27 , encompassing three weekly attempts at the LDS data
download, environmental technicians assumed at each unsuccessful attempt that the system was
uploading, and that data was being stored for collection during a subsequent week. Further
inspection on June 27 identified that the system was not uploading, but had stopped recording.
c) Environmental technicians were also aware that daily manual recording of the same data as collected
by the electronic logger is used for reporting, and mistakenly assumed that the electronic data was
redundant and not required .
4. Actions That Will be Taken to Prevent a Reoccurrence of this Incident
The following actions will be taken to prevent a re-occurrence of this incident:
a) Mill environmental technicians are in the process of procuring, installing, and testing one or more
alternate, more durable, data storage flash drive devices, consistent with the manufacturer's technical
team recommendation. Installation and testing will be complete by July 31,2011 .
b) Mill environmental technicians will attempt to download, install and test an upgraded version of the
data management software, consistent with the manufacturer's technical team recommendation.
Installation and testing will be complete by July 31 ,2011.
c) Mill environmental personnel will monitor the newly installed data device and software daily for one
month after installation, through August 31, 2011 , to confirm whether either or both of these were the
cause of the repeated outages.
d) If the modifications have not corrected the recurring outages by August 31 , 2011, Denison will
evaluate further steps, potentially including repair or replacement of the storage computer. Denison
will develop and discuss a schedule for further steps with DRC at that time.
5. Affirmative Defense
Denison believes that the affirmative defense in Part I.G.3.c) of the Permit should be applicable to this
incident, for the following reasons:
OENISONI)~~
MINES
Letter to Mr. Rusty Lundberg
July 6,2011
Page 4
a) Notification
By virtue of the initial oral notification given to UDEQ at 3:30 PM on Tuesday, June 28, 2011 (within 24 hours
of the discovery) and this written notice, Denison has submitted notification according to UAC R317 -6-6.13.
b) Failure was not Intentional or Caused by the Permittee's Negligence
The failure of the LDS instrumentation to record level data was not caused by Denison's negligence, either in
action or in failure to act. As discussed above, Mill personnel made weekly attempts to download the level
data, as well as daily visits to hand record and preserve data. The equipment malfunctioned between
monitoring events. Mill personnel have made efforts, in progress, to diagnose and correct the system.
c) The Permittee has Taken Adequate Measures to Meet Permit Conditions
Mill personnel have made multiple efforts to diagnose and correct the system, and proposed corrections to the
system are in progress. During the period in question, all of the relevant data was recorded manually to ensure
compliance with the applicable requirements in the Permit. The solution level within the LDS and the flow rate
were within the prescribed limits.
d) Denison has taken adequate measures to meet Permit conditions in a timely manner.
The provisions of the Permit were implemented immediately. UDEQ was notified within 24 hours of discovery
of the solution measurement information. In each case when the data recording system malfunctioned, it was
reset immediately upon discovery by Mill environmental personnel.
e) The Provisions of UCA 19-5-107 Have Not Been Violated
The provisions of Utah Code 19-5-107 have not been violated. There has been no discharge of a pollutant
into waters of the state. Denison has not caused pollution which constitutes a menace to public health and
welfare, or is harmful to wildlife, fish or aquatic life, or impairs domestic, agricultural, industrial, recreational, or
other beneficial uses of water, nor has Denison placed or caused to be placed any waste in a location where
there is probable cause to believe it will cause pollution.
There was no discharge of solutions from the Mill's tailings impoundments.
Please contact the undersigned if you have any questions or require any further information.
Yours very truly,
DENISON MINES (USA) CORP.
Jo Ann Tischler
Director, Compliance and Permitting
i)ENISONr)~~
MINES
Letter to Mr. Rusty Lundberg
July 6,2011
Page 5
cc: David C. Frydenlund
Harold R. Roberts
David E. Turk
Ryan Palmer
Katherine Weinel
Central files
OENISOJ)~~
MINES
Attachment C
I MONTHLY HEAD MEASUREMENT TEST
Comments: Additional readings were taken on Saturday the 16th and Sunday the 17th.
Saturday at 1800 hrs the level was 13.17 feet. On Sunday at 1700 hours the level was 12.70
feet. The report number will be 12.59 which was taken on the 19th.
The slimes drain pipe and the LOS pipe on Cell 2 will have to be raised up to maintain
a reasonable amount of exposed pipe above ground elevation. The dirt work is moving
forward and pipes will be extended with in the next week to ten days.
3rd Quarter 2011 Cell 2 Slimes Drain Liquid Levels
Pump
Date Depth to Liquid pre-Depth to Liquid Pre-Pump Post-Pump Functioning
pump (ft.) post-pump (ft.) Head (ft.) Head (ft.) Properly
(yes/no)
7/8/2011 18.49 22.11 19.51 15.89 yes
7/15/2011 N/A 1 N/A 1 NC NC yes
7/21/2011 N/A 2 N/A 2 NC NC Pump off
7/29/2011 * 35.32 37.46 9.68 7.54 yes
8/5/2011 35.7 36.2 9.3 8.8 yes
8/12/2011 23.5 26.93 21.5 18.07 yes
8/19/2011 35.95 36.1 9.05 8.9 yes
8/26/2011 35.81 36.19 9.19 8.81 yes
9/2/2011 36.11 37.16 8.89 7.84 yes
9/9/2011 35.71 35.85 9.29 9.15 yes
9/16/2011 35.7 36.97 9.3 8.03 yes
9/23/2011 35.99 36.3 9.01 8.7 yes
9/30/2011 35.63 35.98 9.37 9.02 yes
N/Al -7/15/2011, Unable to perform due to recovery test.
N/A2 -7/21/2011, Pump is working properly, however, it is off and maintenance removed it in order
to extend the Cell 2 slimes pipe. Pump will be replaced when the work is completed.
* -As of 7/29/2011, a 7 foot extensionwas added to the slimes pipe on Cell 2. Pre-pump and post-
pump head measurements for the head calculation are now 45 feet. Measurements taken before
7/29/11 are calculated using the old measurement of 38 feet.
NC -Head levels not calculated, because no measurement was taken this week.
The pre and post-pump head level calculations are done as follows:
Pre-pump head = (45*(ft) -depth to liquid pre-pump)
Post-pump head = (45* (ft) -depth to liquid post-pump)
White Mesa Mill -Standard Operating Procedw'es
Book 11: Environmental Protection Manual, Section 3.1
01111 Revision: Denisonll.1
Page 28 of 49
Date: 1-!-II
1. Pond and Beach
elevations (msl, ft)
APPENDIX A (CONT)
DENISON MINES (USA) CORP.
WEEKLY TAILINGS INSPECTION
CellI: (a) Pond Solution Elevation 5611.55
(b) FML Bottom Elevation __ ..,....5597 __ _
(c) Depth of Water above FML «a)-(b)) _--I-I.::..Hu-::..o..5ot..5e...-_
Ce1l4A: (a)Pond Solution Elevation ;VA
(b)FML BottomElevation ___ ,5555.14_
(c)Deptb of Water above FML «a)-(b» _____ _
Cell4B: (a)Pond Solution Elevation
Roberts
(b)FML Bottom Elevation 5557.50
(c)Deptb of Water aboveFML «a)-(b» _____ _
(d)Elevation of Beach Area with Highest Elevation
(monthly)
Pond: (a)Pond Solution Elevation
(b)FML Bottom Elevation
(c)Deptb of Water above FML «a)-(b» _____ _
2. Slimes Drain Liquid Levels Ce112 Pump functioning properly ~
!:& Li'1 Depth to Uquid pre-pump
If 1 t Depth to Liquid Post-pump
(all measurements are depth-in-pipe)
Pre-pump head is 38' -Depth to Liquid Pre-pump = 11 r 5l
Post-pump head is 38' -Depth to Liquid Post-
pump = ,5, g'}
C:\Documents and Settings\dturk.DMC\Locai Settings\Temporary Internet FUes\Contellt.OutlookWM3Y6Sll\Tailings Mgnt System and DMT
Mon Plan Nov 2010 Rv 11 1 • Redline.doc
.... ) White Mesa Mill -Standard Operating Procedures
Book 11: Environmental Protection Manual, Section 3.1
3. Leak Detection Systems
Observation:
Cell! Cell 2
IsLDS wet or _' __ wet ~wet
dry} k/cfry. dry
Cell 3
wet
14firy
01111 Revision: Denison 11.1
Page 29 of49
Ce114A Cell4B
....t.L:'wet --.JLWet
dry dry
If wet, ·Record -. ~ Ft to '1" Ft to --Ftto 5, --; Ftto (') .. 15 Ft to
liquid level: Liquid Liquid Liquid Liquid '" Liquid '"
If sufficient Volume Volume Volume Volume Volume
fluid is -,.--'2bY?/>V -:36051>
present, record Flow /"" Flow Flow Flow Flow __
volume of Rate Rate ,,-Rate -Rate ---Rate
fluid pumped
and flow rate: ./ ./ ./ /'
Was fluid __ yes.JLllo __ yes-t,Liio __ yes~o __ yes--'.Lrto __ yes-lLno
sample
collected?
Observation:
New Decon Pad, New Decon Pad, New Decon Pad
Portal! Portal 2 Portal 3 ..
Is LDS (portal) __ wet~dry __ wet-1Ldry __ wet~ry
wet or dry?
If wet, Record -Ftto ---Ft to -Ftto
liquid level: Liquid Liquid Liquid
If wet, Report to
RSO
4. Tailings Area Inspection (Note dispersal of blowing tailings):
" 6. Remarks: L,W '1 A I.C~ h",.. b.:<o ~o";~c>r..A. des.:. ~"\lC.. vlpddeJ ~4C'(. AMi !c),'11 l' 4i\'h'IACo.
.~. -h. jw'\(maIloC N"J. """,v..( $""", pJ\.:l~ )5 c",lI .. d",J.
C:\Documents and Settings\dlurkDMC\Local Settings\Temporruy Internet Files\Content.Outlook\VM3Y6SmTallings Mgnt System and DMT
MOll Plan Nov 2010 Rv 11 1 -Redline.doc
I '. !of-
White Mesa Mill -Standard Operating Procedures
Book 11: Environmental Protection Manual, Section 3.1
01111 Revision: Denisonll.l
Page 30 of 49
7. Contaminated Waste Dump:_....:!:l-:-..:.o_o_~----=5_----"6c?'"--_CJ-cA_. _________ _
* Does Level exceed 12 inches above the lowest point on the bottom flexible membrane liner (solution
elevation of 5556.14 amsl for Cell4A and 5558.50 for Ce1l4B)? -L.L"iio __ yes
If Cell4A leak detection system level exceeds 12 inches above the lowest point on the bottom flexible
membrane liner (elevation 5556.14 amsl), notify supervisor or Mill manager immediately.
C:\Documents and Settings\dturk.DMC\Local Settings\Temporary Internet Files\Content.Outlook\VM3Y6S1l\Tallings Mgnt System and DMT
Mon Plan Nov 2010 Rv 11 1 • Redline.doc
White Mesa Mill -Standard Operating Procedures
Book 11: Environmental Protection Manual, Section 3.1
01/11 Revision: Denisonl1.1
Page 28 of49
Date: 7-1S'-~oJl
1. Pond and Beach
elevations (msI, ft)
APPENDIX A (CONT)
DENISON MINES (USA) CORP.
WEEKLY TAILINGS INSPECTION
Inspectors: ~ yet .... 5c to : ~ I ""0. ""
Cell 1 : (a) Pond Solution Elevation [) 011 . 4 4
(b) FML Bottom Elevation _---=-_5597 __ _
(c) Depth of Water above FML «a)-(b» __ ,....;,Y_. ~L...JLJ~ __
Ce114A: (a)Pond Solution Elevation _-1"~/.:...1A~ __ _
(b)FML Bottom Elevation __ 5555.14_
(c)Depth of Water above FML «a)-(b») _____ _
Ce1l4B: (a)Pond Solution Elevation
(b)FML Bottom Elevation 5557.50
(c)Depth of Water above FIVlL «a)-(b) (;\0.. cr~
(d)Elevation of Beach Area with Highest Elevation
(monthly) A/A-
Robe11s
Pond: (a)Pond Solution Elevation
(b)FML Bottom Elevation __ ,561.3
(c)Depth of Water above FML «a)-(b» _____ _
2. Slimes Drain Liquid Levels Cell 2 Pump functioning properly L
__ -4M'-=-.L~~_~Depth to Liquid pre-pump
__ ~M~~~ __ Depth to Liquid Post-pump
(all measurements are depth-in-pipe)
Pre-pump head is 38'-Depth to Liquid Pre-pump =
Nt?-
Post-pump head is 38' -Depth to Liquid Post-
pump = iVtt
C:\Documents and Settings\dturk.DMC\Local Settings\Temporary Intemet Files\Content.Outlook\VM3Y6S1 l\Tailings Mgnt System and DMT
Mon Plan Nov 2010 Rv II I -Redline.doc
{
White Mesa Mill -Standard Operating Procedures
Book 11: Environmental Protection Manual, Section 3.1
3. Leak Detection Systems
Observation:
Cell! Cell 2
/
Is LDS wet or ~wet -----1L-wet
dry? dry -dry
If wet, Record -Ft to do Ftto
liquid level: Liquid Liquid
If sufficient Volume Volume
fluid is -.---
present, record Flow Flow
volume of Rate -Rate .--
fluid pumped
/ and flow rate: /
Cell 3
=zdwet
dry
Ftto
Liquid
Volume ....-
Flow .-
Rate
/
01111 Revision: Denison 11.1
Page 29 of49
Ce1l4A Ce114B
/~ /'
V' wet ~wet
dry dry
t(},3 Ptto t,07 Ftto
Liquid >I< Liquid *
Volume Volume
2 ~4370 '5 (pOkiP()
Flow Flow
Rate -Rate
/' ./
Was fluid __ yes ::L.. no __ yes~no __ yes ~ no __ yes---..L6to __ yes vno
sample
collected?
Observation:
New Decon Pad, New Decon Pad, New Decon Pad
Portall Partal2 Portal 3
/ /
Is LDS (portal) __ wet Jdry __ wet JL:dry __ wet~dry
wet or dry?
If wet, Record Ftto Ft to Ftta
liquid level: L!quid Liquid Liquid
If wet, Report to
RSO
..
4. Tailings Area Inspection (Note dispersal of blowing tailings):
.di1Jr7H'/y 51LMe:!> t..v"-S /l?cfprA1c~'"() 'tnrS ~r.?eK, Oe~(l H.eoilt?CVH'\ fOrt=" the ,sb.ry v,,....s
r (?, e' I ' Se Qrt \ c..5·
C;\Documents and Settings\dturk.DMC\Loca! Settings\Ternporary Internet Files\ContenLOutlook\VM3Y6S lI\Tailings Mgnt System and DMT
MOil Plan Nov 2010 Rv 11 1 -Redline.doc
White Mesa Mill -Standard Operating Procedures
Book 11: Environmental Protection Manual, Section 3.1
01111 Revision: Denison11.l
Page 30 of 49
7. Contaminated Waste Dump:. ______ J:::.b-'.J..lO-"'-o+'[c ... S!.-· ---IrQ~CQ"""'--'\:..._ ______ _
* Does Level exceed 12 inches above the lowest point on the bottom flexible me rane liner (solution
elevation of 5556.14 amsl for Ce1l4A and 5558.50 for CeU4B)? no __ yes
If Ce1l4A leak detection system level exceeds 12 inches above the lowest point on the bottom flexible
membrane liner (elevation 5556.14 amsl), notify supervisor or Mill manager immediately.
C:\Documents and Settings\dturk.DMC\Local Settings\Temporary Internet Files\Content.Out!ook\VM3Y6SlI\Tailings Mgnt System and DMT
Mon Plan Nov 2010 R v 11 t -Redline.doc
White Mesa Mill-Standard Operating Procedures
Book 11: Environmental Protection Manual, Section 3.1
01111 Revision: Denisonl1.1
Page 28 of 49
Date: 7/&.1 !'All
1. Pond and Beach
elevations (msl, ft)
APPENDIX A (CONT)
DENISON MINES (USA) CORP.
WEEKLY TAILINGS JNSPECTION
Cell 1: (a) Pond Solution Elevation
(b) FML Bottom Elevation ___ ,5597 __ _
(c) Depth of Water above FML «a)-(b» _--,-' t.t4->-(-iO---
Ce1l4A: (a)Pond Solution Elevation
(b)FML Bottom Elevation __ ,5555.14_
(c)Depth of Water above FML «a)-(b» _____ _
Ce1l4B: (a)Pond Solution Elevation 5580.'11
Roberts
(b)FML Bottom Elevation 5557.50
(c)Deptb of Water above FML «a)-(b» --.!'!AA""""-'A....;.:l'--__
(d)Blevation of Beach Area with Highest Elevation
(monthly)
Pond: (a)Pond Solution Elevation
(b)FML Bottom Elevation _D_t'{1 ___ 5612.3_
(c)Depth of Water above FML «a)-(b» _____ _
2. Slimes Drain Liquid Levels Cell 2 Pump functioning properly p LA"'P ;~ c. .... ~t"C~ ()~.
0U\\j l~ ~ ;-t,.~f'\+~MI1~C
CJc-D +oc.\'... p~l"\p 0<.1\+ +4 0
ext-el\A dI»f'f cAri'sC(;l L:nc S JIl.~
te. +1-.< <::e~r oJ' c..r.t1 ~.
Cell ~ LP~ Qll51) u(\,S <y+<'1'J<.:4
'\U~;.J..~ 01\ tJ.~ c~l"\pl<1.,'cr. o.rJab.
?ou).:4 h ~ <ll\ (~II.2.
______ ~Depth to Liquid pre-pump
_______ Depth to Liquid Post-pump
(all measurements are depth-in-pipe)
Pre-pump head is 38' -Depth to Liquid Pre-pump ;:
Post-pump head is 38' -Depth to Liquid Post-
pump= __ _
C:\Documents and Settings\dturk.DMC\Local Settings\Temporary Internet Files\ContentOutlook\ VM3Y6S lI\Tailings Mgnt System and DMT
Mon Plan Nov 2010 Rv 11 1 -Redline.doc
i."·"j-'"f-\. '\ ~. 1"
White Mesa Mill -Standard Operating Procedures
Book 11: Environmental Protection Manual, Section 3.1
01111 Revision: Denisonll.l
Page 29 of49
3. Leak Detection Systems
Observation:
CellI Cell 2 Cell 3 Ce1l4A Ce114B
Is LDS wet or __ wet ./ wet __ wet ~wet v wet --dry? ./ dry ~ dry / dry dry dry
If wet, Record -Ft to Ftto ~ Ft to ;5:1 Ftto :;1..',10 Ftto ..
liquid level: Liquid Liquid Liquid Liquid * Liquid *
If sufficient Volume Volume Volume Volume Volume
fluid is -~'\ -i)...64371-3'C"'~ present, record Flow Flow Flow Flow Flow
volume of Rate -Rate Rate Rate -Rate --..
fluid pumped
and flow rate:
Was fluid __ yes Lno __ yes~no __ yes~no __ yes ./ no __ yes /no
sample
collected?
Observation:
New Decon Pad, New Decon Pad, New Decon Pad
Portal! Portal 2 Portal 3
Is LDS (portal) __ wet~dry __ wet~dry __ wet ./dry
wet or dry?
If wet, Record Ftto Ftto Ft to
liquid level: Liquid Liquid Liquid
If wet, Report to
RSO
~rcHktt\t~ AO(\:.\cf~
5. Control Methods Implemented:--k>L"",o..b~ecUlu"'\"---Ito..o.J..lIl..-L~~'CD.' __ .w_Mk..."..:1.....:,. ________ _
6. Remarks: WI .;1 .5l1mc~ na..!. beg,", &.':It1 :)\1\(, '\! ..... )~ 11. e)<1, hAt! 1i ... ~r~;" J\)..(!. +~ ,f!/, MCt:'fI~ Ph~~" 2.. 1)£ ~;~(J-(, 1'hJ~~+~JiM I.:>€.;> <ct"'ple:±c -tbi.;)li?<::<k,.
C:\Documents and Settings\dturk.DMC\l..ocal Settings\Temporary Internet Files\Content.OutlookWM3Y6S lI\Tailings Mgnt System and DMT
Mon Plan Nov 2010 Rv 111 • RedUne.doc
White Mesa Mill -Standard Operating Procedures
Book 11: Environmental Protection Manual, Section 3.1
01/11 Revision: Denisonl1.1
Page 30 of 49
7. Contaminated Waste Dump:_...:t.::..;o;:...:(o:..;;~;:..::s"--.... &.'-"'QUII.'-L.l,,--______________ _
* Does Level exceed 12 inches above the lowest point on the bottom flexible membrane liner (solution
elevation of 5556.14 amsl for Ce114A and 5558.50 for Ce1l4B)? ~ no __ yes
If Cell 4A leak detection system level exceeds 12 inches above the lowest point on the bottom flexible
membrane liner (elevation 5556.14 amsl), notify supervisor or Mill manager immediately.
C:\Documents and Settings\dturk.DMC\Locai Settings\Temporary Internet Files\Content.OutlookWM3Y6SlI\Tailings Mgnt System and DMT
Mon Plan Nov 2010 Rv 11 1 -Redline.doc
, '" ,r.-= t ... ..?. , '" ,
""~
White Mesa Mill-Standard Operating Procedures
Book 11: Environmental Protection Manual, Section 3.1
01111 Revision: Denisonll.l
Page 28 of49
Date: 7 -? cr -t(
1. Pond and Beach
elevations (msl, ft)
APPENDIX A (CONT)
DENISON MINES (USA) CORP.
WEEKLY TAILINGS INSPECTION
Cell 1: (a) Pond Solution Elevation
(b) FML Bottom Elevation 5597
(c) Depth of Water above FML «aHb))====1_4.!..!: .. ....c.h:l:~~
Ce1l4A: (a)Pond Solution Elevation ;\/ A
(b)FML Bottom Elevation __ 5555.14_
(c)Depth of Water above FML «a)-(b)) _____ _
Ce1l4B: (a)Pond Solution Elevation .55[0.26
(b )FML Bottom Elevation 5557.50
(c)Depth of Water above FML «a)-(b)) 22 .. 7 /:,
(d)Elevation of Beach Area with Highest Elevation 50
(monthly) ~555 7,
Roberts
Pond: (a)Pond Solution Elevation D t::i
(b)FML Bottom Elevation ___ 56'1.2.3_
(c) Depth of Water above FML «a)-(b») ___ ----__ _
2. Slimes Drain Liquid Levels Cell 2 Pump functioning properly __ ~ __
_=-= 1~5.--,. 3==-:---'i'2,.=--_Depth to Liquid pre-pump
_ ..... :>:;..-.:...7 ..:-. _Lj_t ___ ~Depth to Liquid Post-pump
(all measurements are depth-in-pipe)
1/(
Pre-pump head is 38' -Depth to Liquid Pre-pump =
fr"
Post-pump head is 38' -Depth to Liquid Post-
pump = __ _
C:\Documents and Settings\dturk.DMC\Local Seltings\Temporary fnternet Piles\Content.Outlook\VM3Y6S ll\TaiUngs Mgnt System and DMT
Mon Plan Nov 2010 Rv 11 I -Redline.doc
I~l'\ \: .... #
.J
White Mesa Mill -Standard Operating Procedures
Book 11: Environmental Protection Manual, Section 3.1
3. Leak Detection Systems
Observation:
Celll Cell 2
Is LDS wet or __ wet ~et
dry? ...1LdiY dry
If wet, Record ----Ft to ;;;2' \ Ft to
l!.quid level: Liguid Liquid
If sufficient Volume Volume
fluid is ----'---'
present, record Flow Flow
volume of Rate ---Rate -
fluid pumped
and flow rate:
Was fluid __ yes~o __ yes-'Lno
sample
collected?
Observation:
Cell 3
__ wet
L.....drY
----Ptto
Liquid
Volume -Flow
Rate "---
---__ yesJLno
01111 Revision: Denisonll.l
Page 29 of49
Cell4A Ce1l4B
L..--wet ~et
dry dlY
£5' Ftto [.6':2 Ft to
Liquid * Liquid *
Volume 1$ Volume 2£L./ :>71 3,{66b~
Flow Flow
Rate Rate -
__ yes....tL'no __ yes __ no
New Decon Pad, New Decon Pad, New Decon Pad
Portall Portal 2 Portal 3
Is LDS (Portal) __ wet--L.LC'fry __ wet~dry __ wet JL{fry
wet or dry?
If wet, Record Ftto -Ftto ---Ftto -liquid level: Liquid Liquid Liquid
If wet, Report to
RSO
4. Tailings Area Inspection (Note dispersal of blowing tailings):
L; ...... c,..r-~ 1.N'CV'~.:I'2) ()A.. wpt .Sld( b~ Lett \. £;/U\..\. Lover 6/\ C-e.\l 2: ~ beC/\--co.'1f1
J>vMftr pod? '-<.J~-z. Pic t ;6 lLfW"'" SI!-HkMMt ~0 t2A ??I { $?
h r,' f\4..\ " AU er: 5. Control Methods Implemented: CcC.I\ 2. SI',M.::.J 1 •. /tl,..J ("""~.$e.li\ t-Q bt.. CJ.)QIIL ~ c...V
C:\Documents and Settings\dturk.DMC\Local Settings\Temporary Internet Files\Content.Outlook\ VM3Y6S I I\Tailings Mgnt System and DMT
MOil Plan Nov 2010 Rv II I • Redline.doc
,. ..
White Mesa Mill -:-Standard Operating Procedures
Book 11: Environmental Protection Manual, Section 3.1
01111 Revision: Denisonll.1
Page 30 of49
7. Contaminated Waste Dump:---.:L~o=-o----=-lL._S.--l6.....:::.....-..:;:o.:...:~=-t!<:..!~ ____________ _
* Does Level exceed 12 inches above the lowest point on the bottom flexible memb9ne liner (solution
elevation of 5556.14 amsl for CeIl4A and 5558.50 for Ce114B)? _V_ n no __ yes
If Ce1l4A leak detection system level exceeds 12 inches above the lowest point on the bottom flexible
membrane liner (elevation 5556.14 amsl), notify supervisor or Mill manager immediately.
C:\Documents and Settings\dturk.DMC\Local Settings\Temporary futemet Files\Content.OutlookWM3Y6S ll\Tailings Mgnt System and DMT
Mon Plan Nov 2010 Rv 11 1 • Redline.doc
White Mesa Mill-Standard Operating Procedures
Book 11: Environmental Protection Manual, Section 3.1
01/11 Revision: Denisonll.1
Page 28 of49
Date: Z/5/2-01l
1. Pond and Beach
elevations (msl, ft)
APPENDIX A (CONT)
DENISON MINES (USA) CORP.
WEEKLY TAILINGS INSPECTION
Cell 1 : (a) Pond Solution Elevation S"Il·j7
(b) FML Bottom Elevation __ .,-.5597 __ _
(c) Depth of Water above FML «a)-(b») _...:.../"1.:...;. . .1-11'---__
Cell4A: (a)Pond Solution Elevation
(b)FML Bottom Elevation __ 5555.14_
(c)Depth of Water above FML «a)-(b) _____ _
Ce1l4B: (a)Pond Solution Elevation
Roberts
(b)FML Bottom Elevation 5557.50
(c)Depth of Water above FML «a)-(b» ~. '5
(d)Elevation of Beach Area with Highest Elevation
(monthly)
Pond: (a)Pond Solution Elevation
(b)FML Bottom Elevation __ 5612.3_
(c)Depth of Water above FML «a)-(b)) _____ _
2. Slimes Drain Liquid Levels Cell 2 Pump functioning properly -,'I~e. ..... s __
I-i<\.\) .... J"\o-t ~d' ("e'-;e\J~~ ",dJ<!~
Dep-t\-, 1=roYt1 M"'-·f'\Tcs'\MCL.
35.10 Depth to Liquid pre-pump
~ 3 ~ . .?C Depth to Liquid Post-pump
(all measurements are depth-in-pipe)
Pre-pump head is 38' -Depth to Liquid Pre-pump =
Post-pump head is 38' -Depth to Liquid Post-
pump = __ _
C:\Documents and Settings\dturk.DMC\Local Settings\Temporary lntemet Files\Content.OutJook\VM3Y6S1l\Tailings Mgnl System and DMT
Man Plan Nov 2010 Rv 11 1 -Redline.doc
r \
White Mesa Mill -Standard Operating Procedures
Book 11: Environmental Protection Manual, Section 3.1
3. Leak Detection Systems
Observation:
CellI Cell 2 Cell 3
01111 Revision: Denison 11.1
Page 29 of49
Cell4A Ce114B
IsLDS wet or ~wet ./ wet __ wet ~wet ~wet
dry? . dry -dry v(dry dry dry
If wet, Record O,D Ftto -Ft to Q,o Ft to "'.7 Ft to 6t~ Ft to
liquid level: Liquid Liquid Liquid Liquid * Liquid *
If sufficient Volume Volume Volume Volume Volume
fluid is -:;:;!II ... ;t"~~QO 3bOf.'lO
present, record Flow Flow Flow Flow Flow
volume of Rate -Rate Rate -Rate -Rate -
fluid pumped
and flow rate: /
Was fluid __ yes ~ 110 __ yes~no __ yes .:l.... no __ yes~no __ yes Lno
sample
collected?
Observation:
New Decon Pad, New Decon Pad, New Decon Pad
Portall Portal 2 Portal 3
/
Is LDS (Portal) __ wet J dry __ wet~dry __ wet~dry
wet or dry?
If wet, Record Ftto Ftto Ftto
liquid level: Liquid Liquid Liquid
If wet, Report to
RSO
4. Tailings Area Inspection (Note dispersal of blowing tailings):
,ell ;2. (..0.\1(,(' IS (OMF,I$, ")01': wo~h;(;j 00 <-ell '3 G oqer. u+:!.~ ~ccw hc..,>
bceobIQtl.~ RMAs. 0I.t r>O ""'U<'/<.. l,Qa Gr,.y hr.s ',!''>I-ked \JU'.tJ\.. Is (an «II /'
L".4,:, e~ 11~?.. h4~e. b<!:C1'\ .L.."'po:{ ",,/J.. Govtr .. >-. "')..("~hl:>""'~ +t-. .. ....>ee};.
5. Control Methods Implemented: I<r(r:j 8oeJ.9 ~C4,.-bn:~ +!) k",p iud-Jew", ~5f~<.\'·dla
~e. ~r~"",.l. ,,<-1\ '!> WhW:' 6"",1 -h-, /It,,\ A,r<. 1!!6\):1'l;;j J>+-.
C:\Documents and Settings\dturk.DMC\LocaI Settings\Temporary Internet Files\Content.OutIookWM3Y6S II\Tailings Mgnt System and DMT
Mon Plan Nov 2010 Rv 11 1 . Redtine.doc
White Mesa MilI-Standard Operating Procedures
Book 11: Environmental Protection Manual, Section 3.1
01111 Revision: Denisonll.l
Page 30 of 49
7. Contaminated Waste Dump:---t1-'ol.Qo.::.;Is.:>:>---?jr::o""'cCX<>-.. ________________ _
* Does Level exceed 12 inches above the lowest point on the bottom flexible membrane liner (solution
elevation of 5556.14 amsl for Ce1l4A and 5558.50 for CeU4B)? -L no __ yes
If Ce1l4A leak detection system level exceeds 12 inches above the lowest point on the bottom flexible
membrane liner (elevation 5556.14 amsl), notify supervisor or Mill manager immediately.
C;\Documents and Settings\dturk.DMC\Local Settings\Temporary Internet Files\Content.Out!ook\VM3Y6SlI\Tailings Mgnt System and DMT
Mon Plan Nov 2010 Rv 11 1 -Redline.doc
White Mesa MiIl-Standard Operating Procedures
Book 11: Environmental Protection Manual, Section 3.1
01/11 Revision: Denisonll.l
Page 28 of49
Date: 8/1:;t/~ol\
1. Pond and Beach
elevations (ms!, ft)
APPENDIX A (CONT)
DENISON MINES (USA) CORP.
WEEKLY TAILINGS INSPECTION
Cell 1: (a) Pond Solution Elevation
(b) BI.IL Bottom Elevation 5597 __ _
(c) Depth of Water above FML «a)-(b» _.;...)Q_,6-=0=--__
Ce1l4A: (a)Pond Solution Elevation
(b)FML Bottom Elevation 5555.14_
(c)Depth of Water above FML «a)-(b» _____ _
Ce1l4B: (a)Pond Solution Elevation .557'1. <l5
Roberts
(b)FML Bottom Elevation 5557.50
(c)Depth of Water above FML «a)-(b» _~.;;.;:..:..-'''45=--__
(d)Elevation of Beach Area with Highest Elevation
(monthly)
Pond: (a)Pond Solution Elevation
(b)FML Bottom Elevation __ 5612.3_
(c)Depth of Water above FML «a)-(b» _____ _
2. Slimes Drain Liquid Levels Cell 2 Pump functioning properly Ye S
& F 1 ~Ol).t\d.. +<"; fP~
Re~e.1-tAA~ +v.rncll. f .... t"If en '.
_.c:J.. .... 3""'.S""'O"'-___ .Depth to Liquid pre-pump
_~pu,:::g' _. q\.-:)..L--__ Depth to Liquid Post-pump
(all measurements are depth-in-pipe)
4S
Pre-pump head is .' -Depth to Liquid Pre-pump =
~J..5 ~S
Post-pump head is.' -Depth to Liquid Post-
pump= 1[{.07
C:\Documents and Settings\dturk.DMC\Loca1 Settings\Temporary Internet FIles\Content.Outlook\ VM3Y6S lI\Tailings Mgnt System and DMT
Mon Plan Nov 2010 Rv 11 I -Redline.doc
(
White Mesa Mill -Standard Operating Procedures
Book 11: Environmental Protection Manual, Section 3.1
01111 Revision: Denison 11 .1
Page 29 of49
3. Leak: Detection Systems
Observation:
IsLDS wet or
dry?
If wet, Record
l!quid level:
If sufficient
fluid is
present, record
volume of
fluid pumped
and flow rate:
Was fluid
sample
collected?
Observation:
Is LDS (Portal)
wet or dry?
If wet, Record
liquid level:
If wet, Report to
RSO
Cell!
wet ~ry
Q.\) Ft to
Liquid
Volume
Flow
Rate._-__
__ yes~no
Cell 2
_/_wet
dry
-Ft to
Liquid
Volume
\11
Flow
Rate._-__
Cell 3
__ wet
<~
0.0 Ft to
Liquid
Volume
Flow
Rate_-__
__ yes~no __ yes~no
Cell4A
~wet
dry
7 ·'1 Ftto
Liquid *
Volume
&t./y{)~
Flow
Rate_-__
__ yes~no
New Decou Pad, New Decou Pad, New Decon Pad
Portal 1 Portal 2 Portal 3
__ wet ../ dry __ wet Jdry __ wet ../ dry
-Ft to -' Ftto -Ftto
Liquid Liquid Liquid
Ce1l4B
~wet
dry
:;. ,1~ 1 Ft to
Liquid *
Volume
3bOf,'l I
Flow
Rate._-__
__ yes v no
4. Tailings Area Inspection (Note dispersal of blowing tailings): j.\t\.\·+~(W& be';) (ctlJ:owoJ .in 1:"0+ COil"'·, oa «II,;), L;"'cr (rew <::o(\f,~",l.s..ft, V:>on< 0/\ vJ"':'~
5. Control Methods Implemented: (.."J',VltAC--h. ,hecK -S1:M<s, :!l ~ &F:f·
C:\Documents and Settings\dturk.DMC\Local Settings\Temporary Intemet Files\Content.Outlook\VM3Y6Sll\Tailings Mgnt System and DMT
Moo Plan Nov 2010 Rv 11 1 -Redline.doc
White Mesa Mill-Standard Operating Procedures
Book 11: Environmental Protection Manual, Section 3.1
01111 Revision: Denisonll.l
Page 30 of49
7. Contaminated Waste Dump:---!L~o~ol<.~~ ......... ~~o::;o4.",. _________ ~ ________ _
* Does Level exceed 12 inches above the lowest point on the bottom flexible membrane liner (solution
elevation of 5556.14 amsl for Ce1l4A and 5558.50 for Ce1l4B)? ~ no __ yes
If Ce1l4A leak detection system level exceeds 12 inches above the lowest point on the bottom flexible
membrane liner (elevation 5556.14 amsl), notify supervisor or Mill manager immediately.
C:\Documents and Settings\dturk.DMC\Locai Settings\Temporary Internet Piles\Content.Outlook\VM3Y6SlI\Tailings Mgnt System and DMT
Mon Plan Nov 2010 Rv 11 1 . Redline.doc
(
White Mesa Mill-Standard Operating Procedures
Book 11: Environmental Protection Manual, Section 3.1
01/11 Revision: Denisonll.1
Page 28 of49
1. Pond and Beach
elevations (msI, ft) ,
APPENDIX A (CONT)
DENISON MINES (USA) CORP.
WEEKLY TAILINGS INSPECTION
CellI: (a) Pond Solution Elevation ..5bl(),4<f
(b) FML Bottom Elevation 5597 __
(c) Depth of Water above FML «a)-(b» _~t~Al_~
Ce1l4A: (a) Pond Solution Elevation
(b)FML Bottom Elevation __ 5555.14_
(c)Depth of Water above FML «a)-(b» ____ _
Ce1l4B: (a)Pond Solution Elevation
Roberts
(b)FML Bottom Elevation 5557.50
(c) Depth of Water above FML «a)-(b» e.:l.31
(d)Elevation of Beach Area with Highest Elevation
(monthly) ", .. ,rich,
Pond: (a)Pond Solution Elevation
(b)FML Bottom Elevation
(c)Depth of Water aboveFML «a)-(b» _____ _
2. Slimes Drain Liquid Levels Cell 2 Pump functioning properly ~ __
35,qs Depth to Liquid pre-pump
~b:jO ..... __ Depth to Liquid Post-pump
(all measurements are depth-in-pipe)
Pre-pump head is 1, -Depth to Liquid Pre-pump == <1 . ~.~-LiS
Post-pump head is 88' -Depth to Liquid Post-
pump =8 ,j O
C:\Documents and Settings\dturk.DMC\Loca1 Settings\Temporary Internet F'tles\Content.OutlookWM3Y6S11\Tailings Mgnt System and DMT
Mon Plan Nov 2010 Rv 11 1 -Redline,doc
'''") .'
'. . ,.-~.".
'.
V
White Mesa Mill-Standard Operating Procedures
Book 11: Environmental Protection Manual, Section 3.1
3. Leak Detection Systems
Observation:
CellI Cell 2
Is LDS wet or 7dwet ~wet
dry? _dry ,dry
If wet, Record -Ftto -Ftto
liquid level: Liquid Liquid
If sufficient Volume Volume
fluid is ..... I H
present, record Flow Flow
volume of Rate ."", Rate ....
fluid pumped
and flow rate: " Was fluid __ yes1no __ yes Lno
sample
collected?
Observation:
Cell 3
~wet
dry -Ft to
Liquid
Volume
""
Flow .....
Rate
__ yes Lno
(01111 Revision: Denison 11.1
Page 29 of49
Ce114A Ce114B
~wet ~wet
dry dry
~~Ftto ~.bS Ftto
Liquid * Liquid *
Volume Volume
.~~'1!:i~ ~bO"ql
Flow Flow
Rate ~ Rate ~ . .
__ yes-=-no __ yes./' no
New Decon Pad, New Decon Pad, New Decon Pad
Portal! Porta12 Portal 3
Is LDS (Portal) __ wet -dry __ wet Ldry __ .wet /dry
wet or dry?
If wet, Record .... Ftto ... Ftto --Ft to
liquid level: Liquid Liquid Liquid
If wet, Report to
RSO
4. Tailings Area Inspection (Note dispersal of blowing tailings):
u"!h'L t3 ,cr;1!J ( .. ~t"C.M4 r~M(~ .. JZi \)er ~e.1L_~~· .. .:..' __ ~~ _____ ~~~
b~cl) .ex'tcf'lJ~d Md nc)~ ~~I~u(~\)('re&.t
Cr~ 'h.J..j1l \Helh, !CjM 1..:t.o,);;..J,.~ ~t'l~tr.lIo1d.
C;\Documents and Settings\dturkDMClLocaI Settings\Temporal'Y Internet Files\Content.Outlook\VM3Y6S II\Tailings Mgnt System and DMT
Mon Plan Nov 2010 Rv I I 1 . Redlioe.doc
./
White Mesa Mill -Standard Operating Procedures
Book 11: Environmental Protection Manual, Section 3.1
01111 Revision: Denison 1 1.1
Page 30 of49
7. Contaminated Waste Dump:_--"L_()_D_~_"",5:t-c.o,-..;c\,--_____________ _
* Does Level exceed 12 inches above the lowest point on the bottom flexible memgrane liner (solution
elevation of 5556.14 ams! for Ce1l4A and 5558.50 for Ce1l4B)? ~/_ no __ yes
If Ce1l4A leak detection system level exceeds 12 inches above the lowest point on the bottom flexible
membrane liner (elevation 5556.14 ams!), notify supervisor or Mill manager immediately.
C:\Documents and Settings\dturk.DMC\Local Settings\Temporary Internet Files\ContentOutlook\vM3Y6SlI\Tailings Mgnt System and DMT
Mon Plan Nov 2010 Rv 11 1 • Redline.doc
White Mesa Mill-Standard Operating Procedures
Book 11: Environmental Protection Manual, Section 3.1
01111 Revision: Denison 11.1
Page 28 of49
Date: g/2 6/1\
1. Pond and Beach
elevations (msl, ft)
APPENDIX A (CONT)
DENISON MINES (USA) CORP.
WEEKLY TAILINGS INSPECTION
Cell 1: (a) Pond Solution Elevation ..5610.90
(b) FML Bottom Elevation ___ 5597~ __
(c) Depth of Water above FML «a)-(b» -_.L..12=.-9t--
Ce1l4A: (a)Pond Solution Elevation ;VI\'" 5'!>~!), 1 r
(b)FML Bottom Elevation 5555.14
(c) Depth of Water above FML «a)-C-b-»)--f,-? [(
CeIl4B: (a)Pond Solution Elevation .5571.'7'$
Roberts
(b)FML Bottom Elevation 5557.50
(c)Depth of Water above FML «a)-(b») ;2.~-;2. "3
(d)Elevation of Beach Area with Highest Elevation
(monthly)
Pond: (a)Pond Solution Elevation
(b)FML Bottom Elevation
(c)Depth of Water above FML «a)-(b» ___ -=-=---
2. Slimes Drain Liquid Levels Cell 2 Pump functioning properly
~.:::?~~:;-s-.,f~l:---_~Depth to Liquid pre-pump __ ~<;.A6"",~: ..... i_'9-,---__ Depth to Liquid Post-pump
(all measurements are depth-in-pipe)
45
Pre-pump head is .' -Depth to Liquid Pre-pump =
q " 45 Post-pump head is~' -Depth to Liquid Post-
pump = 9 .. 31
C:\Dacuments lind Settings\dturk.DMC\Locat Settings\Temporary Internet Files\Content.Outlook\VM3Y6SlI\Tallings Mgnt System and DMT
Man Plan Nov 2010 Rv 11 1 -Redline,doc
White Mesa Mill -Standard Operating Procedures
Book 11: Environmental Protection Manual, Section 3.1
3. Leak Detection Systems
fluid is
present, record
volume of
fluid pumped
and flow rate:
Flow
Rate __ -_
--
Flow
Rate __ _
Volume ---Flow
Rate --
01111 Revision: Denisonll .l
Page 29 of49
Volume
to
Volume 6 -;2.6Y~ 0 '36.D6C,6
Flow Flow
Rate -Rate ---
Was fluid
sample
collected?
__ yes-'Liio
Observation:
New Decon Pad, New Decon Pad, New Decon Pad
Portal! Portal 2 Portal 3
~
Is LDS (portal) __ wet~ry __ wet-LL:Cfry __ wet~
wet or dry?
If wet, Record ---Ftto __ Ftto .,............. Ftto
liquid level: Liquid Liguid Liquid
If wet, Report to
RSO
C:\Documents and Settings\dturk.DMC\Local Settings\Temporary Internet Files\Content.Outlook\ VM3Y6SlI\Tailings Mgnt System and DMT
MOil Plan Nov 2010 Rv 11 1 -Redline.doc
White Mesa Mill -Standard Operating Procedures
Book 11: Environmental Protection Manual, Section 3.1
7. Contaminated Waste Dump: Lao 1(5 6 00L
01111 Revision: Denisonll.1
Page 30 of49
* Does Level'exceed 12 inches above the lowest point on the bottom flexible membrane liner (solution
elevation of 5556.14 amsl for Cell4A and 5558.50 for Ce114B)? ---L,L"i10 ~_ yes
If Cell 4A leak detection system level exceeds 12 inches above the lowest point on the bottom flexible
membrane liner (elevation 5556.14 amsl), notify supervisor or Mill manager immediately.
C:\})ocuments and Settings\dturk.DMaLocal Settings\Temporary Internet Files\Content.OutJook\VM3Y6SlI\Tailings Mgnt System and DMT
Man Plan Nov 2010 Rv 11 1 -Redline.doc
White Mesa Mill-Standard Operating Procedw'es
Book 11: Environmental Protection Manual, Section 3.1
01/11 Revision: Denison 11.1
Page 28 of49
1. Pond and Beach
elevations (msl, ft)
APPENDIX A (CO NT)
DENISON MINES (USA) CORP.
WEEKLY TAD..INGS INSPECTION
CellI: (a) Pond Solution Elevation 56*10.76
(b) FML Bottom Elevation ___ 5597 __ _
(c) Depth of Water above FML «a)-(b» __ J..cl$""'"....,7F-f.1.6~
CeIl4A: (a)Pond Solution Elevation 55 S S. '" Gf 4
(b)FML Bottom Elevation ___ 5555.14_
(c)Depth of Water aboveFML «a)-(b» 3".8
CeIl4B: (a)Pond Solution Elevation 5579.S:2..
Roberts
(b)FML Bottom Elevation 5557.50
(c )Depth of Water above F.ML « a)-(b» ;Z 2 .06
(d)Elevation of Beach Area with Highest Elevation
(monthly)
Pond: (a)Pond Solution Elevation 5.6 lC,. "t ;<
(b)FML Bottom Elevation _---:-5612.3-
(c)Depth of Water above FML «a)-(b» __ ---'7<-r£..j6""""""2_
2. Slimes Drain Liquid Levels Cell 2 Pump functioning properly
_3~6",=,".-:-l---:;t r--__ Depth to Liquid pre-pump
_ ..... 3 ..... 2~ .. I .... b""--__ Depth to Liquid Post-pump
(all measurements are depth-in-pipe)
Pre-pump head is ~~epth to Liquid Pre-pump =
f. '1 .... ~\
Post-pump head is ~ -Depth to Liquid Post-
pump = ·7, f(~
C:\Documents and Settillgs\dturk.DMC\Local Set1ings\Temporary Internet Frles\Content.Outlook\VM3Y6SII\Tallillgs Mgnt System and DMT
Mon Plan Nov 2010 Rv 11 I -Redline.doc
(.~)) "-'.
White Mesa Mill -Standard Operating Procedures
Book 11: Environmental Protection Manual, Section 3.1
3. Leak Detection Systems
Observation:
CellI Cell 2
Is LDS wet or __ wet ~wet
dry? _J.£~(try -dry
Cell 3
wet --~dry
01111 Revision: Denison 11.1
Page 29 of49
Ce1l4A Ce114B
~wet ~et
dry dry
If wet, Record -Ftto .. Ftto Ftto 9. \ Ftto \. 02Ft to I -liquid level: Liquid Liquid Liquid Liquid * Liquid *
If sufficient Volume Volume Volume Volume ,~ Volume
fluid is ,.----..--~~LiY 366707
present, record Flow Flow Flow Flow ___ Flow -volume of Rate ---Rate -Rate ....-Rate Rate
fluid pumped
and flow rate: ./ /
Was fluid __ yes...i.L.no -------yesUno __ yes.-i...L'no __ yes~o __ yes~no
sample
collected?
Observation:
New Decon Pad, New Decon Pad, New Decon Pad
Portall PortaI2 POlta13
,/
Is LDS (portal) __ wet-t,L"dry __ wet ~dry __ wet~dry
wet or dry?
If wet, Record /' Ftto ----Ft to -Ftto
liquid level: Liquid Liquid Liquid
If wet, Report to
RSO
4. Tailings Area Inspection (Note dispersal of blowing tailings):
l.<-,\ ~ ,"01.&'-.;",-pf"O.jcc.ss. L-."",~ (...I"YW el~A.. t\-O+-wor Ie.. o~ l.-G.H
5. Control Methods Implemented: £)Ctc.deJ.. V"S. -<tt.e..\ I) 2.} 3 1!II\p-'l.,tor-,> OJ'\.
{.e..l\ ;S So G.aw(.e yt>i.dA !M?+ b~""~1 tbt..cl. L.JA.:bc t~vc.-k:.. lM-s b(!.U\.
qy±-tp i'-'-et> etas t tAoWA. 0vr ''''5 <;'bVC." ~,
6. Remarks:g(.·.,S(.\.M.fIM 5 bW w~H 1::L Ovp. Abc.l "AAeM!oZtiL £illc.A
c..rc...<..l'-.s ; A. ()A.. .st..'<.~scJ.4t'",/ <!',-",A.
C:\Documents and SeUings\dlurk.DMC\LocaI Settings\Temporary Intemet Files\Colltent.OutlookWM3Y6Sll\Tailings Mgnt System and DMT
Mon PhUl Nov 2010 Rv II 1 -Redtine.doc
White Mesa Mill -Standard Operating Procedures
Book 11: Envirorunental Protection Manual, Section 3.1
01111 Revision: Denisonll.1
Page 30 of 49
7. Contaminated WaJ5te Dump:_L~~o..!:e;,:...Ji4i::i~""",--~b"""",Q",-,o",,,--,,<cl~ _________ _
* Does Level exceed 12 inches above the lowest point on the bottom flexible membrane liner (solution
elevation of 5556.14 amsl for Ce1l4A and 5558.50 for Ce1l4B)? -LL.. no __ yes
If Ce1l4A leak. detection system level exceeds 12 inches above the lowest point on the bottom flexible
membrane liner (elevation 5556.14 amsI), notify supervisor or Mill manager immediately.
C:\Documents and Settings\dtu.rk.DMC\Local Settings\Temporary Internet Files\ContenlOutlookWM3Y6Sll\Tailings Mgnt System and DMT
Mon Plan Nov 2010 Rv 11 1 -RedUne.doc
White Mesa Mill-Standard Operating Procedures
Book)11: Environmental Protection Manual, Section 3.1
01/11 Revision: Denisonll.1
. Page 28 of 49
Date: 'erJ.Q 9/1 1M II
1. Pond and Beach
elevations (msl, ft)
APPENDIX A (CO NT)
DENISON MINES (USA) CORP.
WEEKLY TAILINGS INSPECTION
Cell 1: (a) Pond Solution Elevation 56.10·10
(b) FML Bottom Elevation ___ 5597 __ _
(c) Depth of Water above FML «a)-(b» _ ...... I')...,L;--./"------__
Ce1l4A: (a)Pond Solution Elevation ~s ~ 5> ·1Cf
(b)FML Bottom Elevation __ 5555.14_
(c)Deptb of Water above FML «a)-(b» 3D· ( .... :,
Ce1l4B: (a)Pond Solution Elevation
Roberts
(b)FML Bottom Elevation 5557.50
(c)Depth of Water above FML «a)-(b» ;2..\ .'15
(d)Elevation of Beach Area with Highest Elevation
(monthly)
Pond: (a)Pond Solution Elevation :5b:xl.·l$
(b)FML Bottom Elevation __ ~.5612.3_
(c)Depth of Water above FML «a)-(b» _----=,-=-C....:....·'-\...l,jKu.--
2. Slimes Drain Liquid Levels Cell 2 Pump functioning properly '1<:6
_ ..... '1...:S~.JI-l..J ___ Depth to Liquid pre-pump
__ ~~s.~. 6~S~ __ Depth to Liquid Post-pump
(all measurements are depth-in-pipe)
Pre-pump head is ~-Depth to Liquid Pre-pump =
q.;lq L.\5
Post-pump head is 88' -Depth to Liquid Post-
pump = '1. tS
C:\Documents and Settings\dturk.DMaLoca1 Settings\Tempol'ary Internet Files\Content.Outlook\ VM3Y6S1 I\Tailings Mgnt System and DMT
Mon Plan Nov 2010 Rv 11 1 -Redline.doc
(
White Mesa Mill -Standard Operating Procedures
Book 11: Environmental Protection Manual, Section 3.1
3. Leak Detection Systems
Observation:
CellI Cell 2
Is LDS wet or ~wet --':!.....-. wet
dry? dry -dry
Cell 3
~wet
-dry
01111 Revision: Denison 11.1
Page 29 of49
Ce1l4A Ce114B
/ ,
~wet ./ wet
dry dry
If wet, Record ... Ftto -Ftto ,-Ftto ~,;? Ftto ~ \.~O Ft to
liquid level: Liquid Liquid Liquid Liguid * Liquid *
If sufficient Volume Volume Volume Volume Volume
fluid is -II/ -p..bt.\'1~t) '3<-0111
present, record Flow Flow Flow Flow Flow
volume of Rate -Rate -Rate -Rate -Rate -
fluid pumped
and flow rate: .. L /
Was fluid __ yes ~ no __ yes __ no -yes ..!L...no __ yes L no __ yes JL no
sample
collected?
Observation:
New Decon Pad, New Decon Pad, New Decon Pad
Portal I Portal 2 Portal 3
/ /' /~
Is LDS (portal) __ wet~dry __ wet~dry __ wet Vdry
wet or dry?
If wet, Record -Ftto -Ftto -Ftto
liquid level: Liquid Liquid Liquid
If wet, Report to
RSO
4. Tailings Area Inspection (Note dispersal of blQwing tailings): ~!1!n~ &«4 kM)tS. rea~ e,ooJ., ?rccf,k..±~/lO }-... f, helped cM~ 4lL!:.},~
C:\Documents and Settings\dturk.DMC\Loca! Settings\Temporary Internet Files\Content.Outlook\VM3Y6SlI\Tailings Mgnt System and DMT
MOll Plan Nov 2010 Rv 11 1 • Redline.doc
White Mesa Mill-Standard Operating Procedures
Book 11: Environmental Protection Manual, Section 3.1
01111 Revision: Denisonll.l
Page 30 of 49
7. Contaminated Waste Dump:--.-l:!kAA~41(>..:'~~"\lO"'-lO~c\:",;' ______________ _
* Does Level exceed 12 inches above the lowest point on the bottom flexible me~ne liner (solution
elevation of 5556.14 amsl for Ce1l4A and 5558,50 for Ce1l4B)? _._ no __ yes
If Ce1l4A leak detection system level exceeds 12 inches above the lowest point on the bottom flexible
membrane liner (elevation 5556.14 amsl), notify supervisor or Mill manager immediately.
C:\Documents and Settings\dtul'k.DMC\Local Settings\TempoJ'ary Internet Files\Content.Outlook\VM3Y6S11\Tailings Mgnt System and DMT
Mon Plan Nov 2010 Rv 11 I -Redline.doc
-"" ... ,
(
White Mesa Mill-Standard Operating Procedures 01111 Revision: Denisonl!.l
Page 28 of49 Book 11: Environmental Protection Manual, Section 3.1
Date: q -l6 -t I
1. Pond and Beach
elevations (msl, ft)
APPENDIX A (CONT)
DENISON MINES (USA) CORP.
WEEKLY TAILINGS INSPECTION
Cell 1: (a) Pond Solution Elevation .5610 ... 90
(b) FML Bottom Elevation __ 5597. __ _
(c) Depth of Water above FML «a)-(b» _--L1"3.:::...:..-.!:!..8' __
Cell 4A: (a)Pond Solution Elevation :) S 8.5. 1 b
(b)FML Bottom Elevation __ 5555.14_
(c)Depth of Water above FML «a)-(b» J Ok 8?--
Cell4B: (a)Pond Solution Elevation 557q 1...14
(b )FML Bottom Elevation 5557.50
(c)Depth of Water above FML «a)-(b» ;2.1 " qq
(d)Elevation of Beach Area with Highest Elevation
(monthly) ~~
Roberts
Pond: (a)Pond Solution Elevation .s6JL I .' /.5
(b)FML Bottom Elevation _---."'.5612.3-
(c)Depth of Water above FML «a)-(b» _---'"'~'_"_v..lJ.8 ..... S""--_
2. Slimes Drain Liquid Levels Cell 2 Pump functioning properly
_~:?::;--;5,.-._7~o=-· _Depth to Liquid pre-pump
__ ?..<...Lh<--q~7f..--_Depth to Liquid Post~pump
(all measurements are depth-in-pipe)
L./S
Pre-pump head is ~' -Depth to Liquid Pre-pump =
g o<]. 45
Post-pump head is lS.' -Depth to Liquid Post-
pump= g.O:>
C:\Documeots and Settings\dturk.DMC\Local Settings\Temporary futernet FiIes\ContentOutJook\VM3Y6S ll\Tailings Mgnt System and DMT
Mon Plan Nov 2010 Rv 11 1 -Redline.doc
, ..... "'~ .~.~
'1:0 j) . !~
White Mesa Mill-Standard Operating Procedures
Book 11: Environmental Protection Manual, Section 3.1
01111 Revision: Denison11.1
Page 29 of49
3. Leak Detection Systems
Observation:
CellI Cell 2 Cell 3 Ce1l4A Ce114B
Is LDS wet or __ wet ~wet ~wet ~wet ~et
dry? ~ry dry -dry .dry 41)'
If wet, Record -Ftto ( Ftto ---Ftto %.6 Ftto 7. 5 /..l..Ft to
liquid level: Liquid Liquid Liquid Liquid * Liquid *
If sufficient Volume Volume Volume Volume Volume
fluid is ......... -.~r'-----26 t-/y6 () '360 '7'-11
present, record Flow Flow Flow Flow -Flow
volume of Rate -Rate ~ Rate -Rate Rate ~
fluid pumped
and flow rate: /
Was fluid __ yes..J..,.Liio __ yes-L6lo __ yes.J.Lno __ yes l...---'110 __ yes~
sample
collected?
Observation:
New Decon Pad, New Decon Pad, New Decon Pad
Portall Porta12 Portal 3
Is LDS (portal) __ wet-L.&ry __ wet~ry __ wet~dry
wet or dry?
If wet, Record ----'Ft to _________ Ft to --Ftto
liquid level: Liquid Liquid Liquid
If wet, Report to
RSO
_ PO(.;.7(.,.r qc>v~ of~ 0,,-c..e..\1,. \ L-()S. \~yov-.. Yvv~ w-c..-5
4. Tailings Area Inspection (Note dispersal of blowing tailings):
fowe.c Q>vttL~c.s "ill.-tiel. l..>U 1t..(...vA r' <\usu& M4!tVJ\.,,+ID,d wi LvII I Lit> ;! l!ltV
. .n~tIP"'"S .5)6. P,=,,A.I-o! ,&It Dei 12,rAt,e. !d.nH G-C<.Ji"2? S bv.M.#,c fo>b."
-fN ...... {J(!.r-PC.5rs 0-'1""(.... \"" +-(,..<. f rOG-c..55 o~ bc.-;V;S \ASto-..ll~ o...r-OVA-tA.. A/, tr-e.-tt:... LJeJls
tkc-{--clc.",1-k~v~ +-ke-w'-.
-rkc...y", L-J..i..st:-t..J... t..::..I\ '2 +0 pr-c.p. f'o r-.f!:,r-c...sp PIAV\:{-~v:5'
5. Control Methods Implemented: IZ '-5 et GrI ~S" C>.A l!!-\..v Jth-tj' 0"'-s f? Ie_ S e.. t (".k~ of 0 A
c"c..11 ;J.... to fix Mp.,lfvAc...t"I/>V\S. ,ttA.v~J..y tpds ;6..-"h ... ;Ls. 9.-J'Us Pc,.uw)!-of I"c<.;",,/
->+v.,/ of'£ tbe;t:lJ if' po (s! bU .... D,vt..I'{,Ct"-""';I-c..~c..) !l\.e-uA.. (,.kWA~rA (.....;k,,,, l.Vr~h(' cLt'~
6. Remarks: CDlkc.:tu!. J'Ui'f'ti."'" wc...t4" 5<).tM.t'I"S £r-oV"'\. kcd"h24 wool;.!; wvt wc:.-tc.r
t:cA4'>E£ kA c....r~M w\"'efc.,. '>(,)"'~c...l.c. waJ:y bv;lcAS t..,>i,...e..A. 1~S§,e.. C<-..v\-o,-,,,+S of.
rr-e..'-iP~ C7C--l.vd. Pko+o.> IN'U'c.. t-C<.j:.eA.. o-f' o..vee....s.
C:\Documents and Settings\dturk.DMC\Local Settings\Temporary Internet Files\Contellt.OutlookWM3Y6Sll\Tailings Mgnt System and DMT
Mon Plan Nov 2010 Rv II 1 "Redline.doc
. L-~Vl.V (..'(;L-../ wvl'-;~ (;J.ro.. >Dl.ltk ~;Ac-0 (::' t-c:.ll
White Mesa Mill -Standard Operating Procedures
Book 11: Environmental Protection Manual, Section 3.1
01/11 Revision: Denisonll.l
Page 30 of49
7. Contaminated Waste Dump:-L'~-,k-----==~s __ 6 __ Oc_...;;.)~< ________ _
* Does Level exceed 12 inches above the lowest point on the bottom flexible membrane liner (solution
elevation of 5556.14 arnsl for Ce1l4A and 5558.50 for CeU4B)? ~o __ yes
If Ce1l4A leak detection system level exceeds 12 inches above the lowest point on the bottom flexible
membrane liner (elevation 5556.14 amsl), notify supervisor or Mill manager immediately.
C;\Documents and Settings\dturk.DMC\Locai Settings\Temporary Internet Piles\Content.Outlook\VM3Y6S1 I\Tailings Mgnt System and DMT
Mon Plan Nov 2010 Rv II 1 -Redline.doc
White Mesa Mill -Standard Operating Procedw'es
Book 11: Environmental Protection Manual, Section 3.1
01111 Revision: Denison 11.1
Page 28 of49
1. Pond and Beach
elevations (msl, ft)
APPENDIX A (CONT)
DENISON l\1lNES (USA) CORP.
WEEKLY TAILINGS INSPECTION
Cell 1: (a) Pond Solution Elevation
(b) FML Bottom Elevation __ .5597 __ _
(c) Depth of Water above FML «a)-(b» _......:...;.;r'3'-.~"'--__
Ce1l4A: (a)Pond Solution Elevation SS~b. 0'-1
(b)FML Bottom Elevation __ 5555.14_
(c)Depth of Water above FML «a)~(b» 30.:)0
Ce1l4B: (a)Pond Solution Elevation
Roberts
(b)FML Bottom Elevation 5557.50
(c)Depth of Water above FML «a)-(b» .:l,\ .'-15
(d)Elevation of Beach Area with Highest Elevation
(monthly)
Pond: (a)Pond Solution Elevation 5 (",;l.c>·by
(b)FML Bottom Elevation __ .5612.3_
(c) Depth of Water above FML «a)-(b» __ 7~:7-1'1,----
2. Slimes Drain Liquid Levels Cell 2 V Pump functioning properly \ e ~
__ ~35..o:::..·_q!.....l4,--_Depth to Liquid pre-pump
___ ~...B2:;;':::' ~. _~Depth to Liquid Post-pump
3 b' ':::J)
(all measurements are depth-in-pipe)
'-IS
Pre-pump head is ~'-Depth to Liquid Pre-pump =
q.O\ -6.
Post-pump head is ~' -Depth to Liquid Post-
pump =: ~.7
C:\Documents and Settings\dturk.DMC\Local Settings\Temporary Internet FiIes\Content.Outlook\VM3Y6Sll\Tailings Mgnt System and DMT
Mon Plan Nov 2010 Rv 1 I 1 -RedJine.doc
.. () ", ...
"'.-
White Mesa Mill -Standard Operating Procedures
Book 11: Environmental Protection Manual, Section 3.1
01111 Revision: Denisonll.1
Page 29 of49
3. Leak Detection Systems
Observation:
Cell! Cell 2 Cell 3 Cell4A Ce114B
/
Is LDS wet or -;;r:;wet _v wet ~wet ~wet ~wet
dry? dry dry dry dry dlY
If wet, Record 0.0 Ftto -Ft to -Ftto &.j Ftto ,;;l.,cn Ftto
liquid level: Liquid Liquid Liquid Liquid * Liquid *
If sufficient Volume Volume ' Volume Volume Volume
fluid is 0.6 III -~b~t..jf.D 3~()7Yt
present, record Flow Flow Flow Flow Flow
volume of Rate -Rate -Rate -Rate -Rate -
fluid pumped
and flow rate:
Was fluid __ yes ./ no __ yes_.t' no __ yes~llo __ yes--Lno __ yes~no
sample
collected?
Observation:
New Decon Pad, New Decon Pad, New Decoll Pad
Portall Portal 2 Portal 3
Is LDS (portal) __ wet ~dry __ wet Vdry __ wet ~dry
wet or dry?
If wet, Record .-. Ftto -Ftto -Ftto
liquid level: Liquid Liquid Liquid
If wet, Report to
RSO
4. Tailings. Area Inspection (Note dispersal of blowing tailings): .j.' ('> .
~LD.> ; ['" t. ~e.JfI-~tV" . ..rtr, W (" e(~J. I'\d. ,fivo( aQ.er ,;I",~. NO 5.<>1", I~" -IovnJ ." (,.,:,s
Lei! I hAl Cf'po?id Lac.-. ~),\;J~ UCtH ~Qb ·to q,vcr Gil ><'1posc:J j";,,cr MQok\1'
v,t:l.tj ue(),) c..o"Jjt1u.c~ to F"'f-,-oV.er C:V"Ol.>".l" ..... ) 0'" <ell ~,
C:\Documents and Settings\dturk.DMC\Local Settings\Temporary Internet Files\Content.Outlook\VM3Y6SlI\Tailings Mgnt System and DMT
MOll Plan Nov 2010 Rv 1 I 1 -Redline.doc
White Mesa MiIl-Standard Operating Procedures
Book 11: Environmental Protection Manual, Section 3.1
01/11 Revision: Denisonll.1
Page 30 of 49
7. Contaminated Waste Dump:_....!oL-~o~Dk~~=--..:.G-!..\o""o~u\:l-_______________ _
* Does Level exceed 12 inches above the lowest point on the bottom flexible membrane liner (solution
elevation of 5556.14 amsl for Ce1l4A and 5558.50 for Ce1l4B)? ----=:::no __ yes
If Ce1l4A leak detection system level exceeds 12 inches above the lowest point on the bottom flexible
membrane liner (elevation 5556.14 amsl), notify supervisor or Mill manager immediately.
C:\Documents and Settings\dtul'k.DMC\Local Settings\Temporary Internet FUes\Content.Outlook\VM3Y6S1I\Tailings Mgnt System and DMT
Mon Plan Nov 2QIO Rv 11 1 -Redline.doc
White Mesa Mill -Standard Operating Procedures
Book 11: Environmental Protection Manual, Section 3.1
01111 Revision: Denison 11.1
Page 28 of49
Date:~...Q ~ .. tl __ _
1. Pond and Beach
elevations (ms!, ft)
APPENDIX A (CONT)
DENISON MINES (USA) CORP.
WEEKLY TAILINGS INSPECTION
Cell 1: (a) Pond Solution Elevation
(b) FML Bottom Elevation ___ ,5597 __ _
(c) Depth of Water above FML «a)-(b» _-+-1'~.;u.'-I7 ...... 2,,----
CeIl4A: (a) Pond Solution Elevation 5S 8 5. 92.
(b)FMLBottomElevation __ 5555.14_
(c)Depth of Water above FML «a)w(b» 3D. 78
CeIl4B: (a)Pond Solution Elevation 55Jq~ 25
Roberts
(b)FML Bottom Elevation 5557.50
(c)Depth of Water above FML «a)-(b) 21.75
(d)Elevation of Beach Area with Highest Elevation
(monthly) dA
Pond: (a)Pond Solution Elevation S 619 52
(b)FML Bottom Elevation ___ ,5612.3_
(c)Depth of Water above FML «a)-(b)) __ -<7u ..... :fc....;.l.2_
2. Slimes Drain Liquid Levels Cell 2 Pump functioning properly C//'
_~:?;..:o5:::"'·' • .wb~3:.:.." __ Depth to Liquid pre-pump
_~.3:::;..~;;;...'~ ........... q ..... S5"---_Depth to Liquid Post-pump
(all measurements are depth-in-pipe)
Pre-pump head is~~ -Depth to Liquid Pre-pump =
q,37 4,5'
Post-pump head is~' -Depth to Liquid Post-
pump = 3...122
C:\Documents and Settings\dturkDMC\LocaJ Settings\Temporary Internet Files\Contellt.Outlook\VM3Y6SlI\Tailings Mgnt System and DMT
Mon Plan Nov 2010 Rv 11 1 -Redline.doc
· ~-., White Mesa Mill -Standard Operating Procedures
Book 11: Environmental Protection Manual, Section 3.1
01lll Revision: Depisonll.l
Page 29 of49
3. Leak Detection Systems
Observation:
IsLDS wet or
dry?
If wet, Record
liquid level:
If sufficient
fluid is
present, record
volume of
fluid pumped
and flow rate:
Was fluid
sample
collected?
Observation:
Is LDS (portal)
wet or dry?
If wet, Record
liquid level:
If wet, Repolt to
RSO
Cell! Cell 2 Cell 3 Ce114A
__ wet __ wet --wet _~:..wet
_.I,.t:::.::'dry V dry ... !--",-'"'dry dry
~~ Ft to ,--~' Ftto --' Ftto Of,£> Ftto
Liquid Liquid Liquid Liquid *
Volume Volume Volume Volume
....-..,.,..",,\ .,..~ 1III'JIL:26 Lf 46l
Flow Flow Flow Flow
Rate -' Rate -Rate ......... Rate
__ yes--\..L'no __ yes--1..Lllo __ yes~no __ yes.L..:::::H0
New Decon Pad,
Portal I
New Decon Pad,
Portal 2
New Decon Pad
Portal 3
__ wet~ry __ weC~dry __ wec.l.L"dry
~,-Ft to -Ft to ~_Ftto
Uguid Liquid Liquid
4. Tailings Area Inspection (Note dispersal of blowing tailings):
CeIl4B
l,,/"wet
dry
...:I~Ji.2.Ft to
Liquid *
Volume
'36oiy ?
Flow
Rate --
__ yes (,.----·no
vtjLty ?f"u"J n-hvoll: eaJ (u,(!luyl (..,,11 ~ • .3 JWMpe4 Qt.r l: O'.'\'" c...e.l' t 1.4I}C POor fl'ote.(.hcN\'
i?v.jt ,,"!,oJ k>"xe-5 for-Aw-19) ft\W ;26. i'f't4-1 ..... ~J. bex,,"s far t1 II 'od,",>!/) pv~:";5 tv~1I boxeS.
~ tt-H 1.. t,..DS I./~; pv+ ;'" P1 c:,tc.c..tr;c.i ~5<
5. Control Methods Implemented:.£o~~"e! up cdl 1...,J&"t~,... ; 1\" t-~II 2. ~Q S \.".// bvve.ls j f"ofe.·
E"h;f:,tM Ml.J'£ 36.37. utd..j::t pt,; .. t..cd.. bV,tV\.ft.f= poS+~ t' ... Cp!I~ 11£ .. ;;2. &"P1<t-hzr>"\:..v~ . .d ..
S ~ct<.. p (: (..e.U 5'.
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Mon Plan Nov 2010 Rv II 1 .. RedUne.doc
White Mesa Mill -Standard Operating Procedures
Book 11: Environmental Protection Manual, Section 3.1
01/11 Revision: Denisonl1.l
Page 300f 49
* Does Level exceed 12 inches above the lowest point on the bottom flexible membrane liner (solution
elevation of 5556.14 amsl for Ce1l4A and 5558.50 for Ce1l4B)? .~.tL:: no __ yes
If Ce1l4A leak detection system level exceeds 12 inches above the lowest point on the bottom flexible
membrane liner (elevation 5556.14 amsl), notify supervisor or Mill manager immediately.
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Mon Plan Nov 2010 Rv II 1 -Redline.doc
'\.,,'
Attachment D
Feet Below Top of Standpipe
I-' I-' I-' I-'
(l') -l'> N 0 00 (l') -l'> N 0
1/30/2009
2/28/2009
3/31/2009
4/30/2009
5/31/2009
6/30/2009
I "ll I n ~ 7/31/2009 I'D
8/31/2009
N
(I' + 9/30/2009 --. 10/31/2009 3 Vl I'D ...,
I'D (ii' 11/30/2009 Vl V) N
C 12/31/2009
"'" QJ 1/31/2010 -. :::l 2/28/2010
N 3/31/2010
0
0 c: 4/30/2010
\D ::J ... I'D 5/31/2010 Q)
N ...,
Vi' 0 I'D 6/30/2010
~ ...,
(ii'
0 Vl 7/31/2010 ~ ~ 20 8/31/2010
N 9/30/2010 0
~ 10/31/2010 ~
" 11/30/2010
12/31/2010
1/31/2011
2/28/2011
3/31/2011
4/30/2011
5/31/2011
J' r 6/30/2011
Attachment E
This attachment has been deliberately left blank.
Attachment F
July 2011
Date
07/06/11
07/13/11
07/20/11
07/27/11
Cell 4A LOS Monitoring Information
Weekly measurements in inches
from transducer at the bottom of
the LDS sump.
4.2
6.5
4.7
7.5
Flow Meter in Gallons
264200
264200
264376
264376
Highest level for the month based on the daily data was 12.4 inches and the lowest level for the
month was 3.1 inches. Total number of gallons pumped was 176.
August 2011
Weekly measurements in inches
from transducer at the bottom of
Date the LDS sump. Flow Meter in Gallons
08/03/11 7.0 264380
08/10/11 6.6 264400
08/17/11 6.2 264405
08/24/11 7.1 264460
08/31/11 7.0 264464
Highest level for the month based on the daily data was 9.1 inches and the lowest level for the
month was 6.2 inches. Total number of gallons pumped was 84.
September 2011
Date
09/07/11
09/14/11
09/21/11
09/28/11
Weekly measurements in inches
from transducer at the bottom of
the LDS sump.
7.1
8.7
7.4
6.1
Flow Meter in Gallons
264460
264460
264460
264460
Highest level for the month based on the daily data was 11.1 inches and the lowest level for the
month was 5.2 inches. Total number of gallons pumped was O.
For the 3rd Quarter 2011, the highest level was 12.4 inches and the lowest level was 3.1 inches.
A total of 260 gallons were pumped.
July 2011
Date
07/05/11
07/12/11
07/19/11
07/26/11
Cell 48 LOS Monitoring Information
Weekly measurements in inches
from transducer at the bottom of
the LDS sump.
11.54
0.18
2.97
1.57
Flow Meter in Gallons
360513
360632
360660
360666
Highest level for the month based on the daily data was 11.59 inches and the lowest level for the
month was 0.18 inches. Total number of gallons pumped was 153.
August 2011
Weekly measurements in inches
from transducer at the bottom of
Date the LDS sump. Flow Meter in Gallons
08/02/11 1.54 360687
08/09/11 -0.1 * 360691
08/16/11 2.41 360691
08/23/11 -3.7* 360691
08/30/11 -0.37* 360707
Highest level for the month based on the daily data was 3.25 inches and the lowest level for the
month was -3.7 inches. Total number of gallons pumped was 41.
September 2011
Date
09/06/11
09/13/11
09/20/11
09/27/11
Weekly measurements in inches
from transducer at the bottom of
the LDS sump.
2.13
2.41
2.97
2.69
Flow Meter in Gallons
360707
360747
360747
360747
Highest level for the month based on the daily data was 3.52 inches and the lowest level for the
month was -0.1 inches. Total number of gallons pumped was 40.
For the 3rd Quarter 2011 , the higheest level was 11 .59 inches and the lowest level was -3.7
inches. A total of 234 gallons were pumped.
* -The measuring systems in the LDS systems are pressure sensors which measure the amount
of solution above the sensor based on presssure. There are natural fluctuations in the system
based on atmospheric barometric pressure. The base line of zero can be affected when
atmospheric barometric pressure changes. The atmospheric barometric pressure changes can
produce some negative numbers as well as false positive numbers, but the fluctuation is usually
no greater than a couple of inches.
GWJS)'nt!c Consultants nble 1A
Ca!culated Action t.alkqe Rates for Various Head Conditions
CeJl4A, White Mtu Mill
Bllndfn" Utah
Head Above Uner QIcUIaWd Actfon ...... 1IJte
System (feet) (pllon./lue/dl.,)
5 222.04
.w 314.0
15 384.58
20 444.08
25 496.5
30 543.18
35 587.5 -37 604.0
G,oqntfc CoMUhrlnu Tibia 11
Calculated ActIon Lfakase Rate. for Virioul Head CondltTons
Cell 48, WhIte Mey Mill
Bllndln., Ullh
Hlld Above UIM, 5ph1m Clrelll,tId Actfon Ltlklp Rate
('eet, CI.Ron./.ore/day'
5 211.4
10 817.0
15 369.9
ZO 422.7
25 475.8
30 528.4
3S 570.0
37 581.2
Calculation of Maximum Daily Allowable LDS Flow Volume for Varying Head Conditions in
Cells 4A and 4B
The equation for the calculation of maximum daily allowable flow volume in Cells 4A and 4B is
as follows:
Step 1)
Where:
Step 2)
Step 3)
Step 4)
Elevation I-Elevation 2 = Head (ft.)
Elevation 1 is the maximum elevation in feet measured during the reporting
period.
Elevation 2 is the FML elevation in feet.
Determine Calculated Action Leakage Rate from Table lA (for Cell 4A) or Table
IB (for CeIl4B) using the head calculated in Step 1 above. If the head calculated
in step 1 above falls between two values in the Head Above Liner System (feet)
column, then the closer of these two values will be used to determine the
Calculated Action Leakage Rate.
Calculate the acres of tailings cell fluids based on the area of the base of the cell,
the head, and the angle of the sideslopes of the cell.
Action Leakage Rate (from Table lA or IB) X Acres of Tailings Cell Fluids =
Maximum Daily Allowable Flow Volume
Max head on Cell4A FML
Max elvation (ft.)
FML elevation (ft.)
Head (ft.)
From BAT O&M Table lA (gallon/acre/day)
Assume acres of fluid based on maximum level (acres)
Max allowable flow rate (gal/day)
4A -Q3 2011
5586.04
5555.55
30.49
543.88
38
20667.44
Max head on Cell4B FML
Max elvation (ft.)
FML elevation (ft.)
Head (ft.)
From BAT O&M Table lB (gallon/acre/day)
Assume acres of fluid based on maximum level (acres)
Max allowable flow rate (gal/day)
4B -Q3 2011
5580.61
5557.5
23.11
475.6
31.5
14981.4
Cell 1 and Cell 3 LOS Monitoring Information -Third Quarter 2011
July 2011
Measurement in Measurement in
inches from inches from
Cell Date transducer at the Cell Date t ransducer at the
bottum of the LDS bottum ofthe LOS
sump. sump.
Celli 7/8/2011 Dry Cell 3 7/8/2011 Dry
7/15/2011 Dry 7/15/2011 Dry
7/21/2011 Dry 7/21/2011 Dry
7/29/2011 Dry 7/29/2011 Dry
August 2011
Measurement in Measurement in
inches from inches from
Cell Date transducer at the Cell Date transducer at the
bottum ofthe LOS bottum of the LDS
sump. sump.
Celli 8/5/2011 Dry Cell 3 8/5/2011 Dry
8/12/2011 Dry 8/12/2011 Dry
8/19/2011 Dry 8/19/2011 Dry
8/26/2011 Dry 8/26/2011 Dry
September 2011
Measurement in Measurement in
inches from inches from
Cell Date transducer at the Cell Date transducer at the
bottum ofthe LDS bottum of the LDS
sump. sump.
Celli 9/2/2011 Dry Cell 3 9/2/2011 Dry
9/16/2011 Dry 9/16/2011 Dry
9/23/2011 Dry 9/23/2011 Dry
9/30/2011 Dry 9/30/2011 Dry
Attachment G
This attachment has been deliberately left blank.