DRC-2012-001191 - 0901a068802b2d22

t)RC-2012-00 119 1
DENISO
MINES
Denison Mines (USA) Corp
105017th Street Suite 950
Denver CO 80265
USA
Tel [phone]
Fax [phone]
www denisonmines com
February 27 2012
Sent VIA Federal Express
Mr Rusty Lundberg
Co Executive Secretary
Utah Water Quality Board
Utah Department of Environmental Quality
195 North 1950 West
PO Box 144810
Salt Lake City UT 84114 4820
Re Transmittal of DMT Performance Standards Monitoring Report and Cell 4A BAT
Performance Standards Momtormg Report for the 4* Quarter of 2011
DearMr Lundberg
Enclosed please find two copies of the DMT Performance Standards Monitoring Report and Cell
4A BAT Performance Standards Monitoring Report for the 4'^ Quarter of 2011 as required
under Parts IF 2 and IF 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
RonF Hochstein
Harold R Roberts
David E Turk
Kathy Wemel
OENISOJ)~~
MINES
February 27,2012
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 BAT
Performance Standards Monitoring Report for the 4th Quarter of 2011
Dear Mr. Lundberg:
Enclosed please find two copies of the DMT Performance Standards Monitoring Report and Cell
4A BAT Performance Standards Monitoring Report for the 4th 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
4th Quarter
October through December
2011
State of Utah
Groundwater Discharge Permit No. UGW370004
Prepared By:
Denison Mines (USA) Corp.
1050 17th Street, Suite 950
Denver, CO. 80265
February 27, 2012
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 ......................................................................................................................... 4
4.2.1 Summary of Changes to Cell 2 .................................................................................................................... 5
4.2.2 Quarterly Recovery Test Data ..................................................................................................................... 5
4.2.3 Weekly Pre-and Post-Pump Head Measurements ...................................................................................... 6
4.3 QUALITY ASSURANCE EVALUATION AND DATA VALIDATION ..................................................................... 6
4.4 GRAPHIC COMPARISON TO PREVIOUS yEAR ................................................................................................. 6
5.0 WEEKLY WASTEWATER LEVEL MONITORING: ROBERTS POND ............................................ 7
6.0 WEEKLY FEEDSTOCK STORAGE AREA INSPECTIONS AND INSPECTIONS OF
FEEDSTOCK MATERIAL STORED OUTSIDE THE FEEDSTOCK STORAGE AREA ................. 7
7.0 TAILINGS CELLS AND POND LINER SYSTEM REPAIRS ................................................................ 7
8.0 DECONTAMINATION PADS .................................................................................................................... 8
8.1 SUMMARY OF WEEKLY INSPECTIONS ........................................................................................................... 8
8.2 ANNUAL INSPECTION OF EXISTING DECONTAMINATION PAD ..................................................................... 10
8.3 ANNUAL INSPECTION OF NEW DECONTAMINATION PAD ............................................................................ 10
9.0 CELL 4A AND CELL 4B BAT PERFORMANCE STANDARDS REPORT FOR THE QUARTER10
9.1 LDS MONITORING ...................................................................................................................................... 10
9.1.1 Operational Status of LDS Pumping and Monitoring Equipment ......................................................... 10
9.1.2 Measurement of Weekly Fluid Head at the Lowest Point in the Secondary FML ................................. 11
9.1.3 Measurement of the Volume of Fluids Pumpedfrom the LDS ............................................................... 11
9.2 MEASUREMENT OF WEEKLY WASTEWATER FLUIDS IN CELLS 4A AND 4B ................................................. 12
9.3 SLIMES DRAIN RECOVERY HEAD MONITORING .......................................................................................... 13
10.0 CELL 1 AND CELL 3 LDS MONITORING FOR THE QUARTER .......................................................... 13
10.1 OPERATIONAL STATUS OFLDS PUMPING AND MONITORING EQUIPMENT ................................................. 13
10.2 MEASUREMENT OF THE VOLUME OF FLUIDS PUMPED FROM THE LDS ....................................................... 13
10.3 MEASUREMENT OF WEEKLY WASTEWATER FLUIDS IN CELLS 1, AND 3 ..................................................... 14
10.4 SLIMES DRAIN RECOVERY HEAD MONITORING .......................................................................................... 14
11.0 ANNUAL SLIMES DRAIN RECOVERY HEAD REPORT FOR THE CALENDAR YEAR 2011 .. 14
11.1 INDIVIDUAL SLIMES DRAIN RECOVERY HEAD FOR 2011 ............................................................................ 14
11.2 AVERAGE SLIMES DRAIN RECOVERY HEAD FOR 2011 ........................................................................ ; ...... 14
11.3 TIME SERIES CHART ................................................................................................................................... 14
11.4 QUALITY ASSURANCE EVALUATION AND DATA VALIDATION ................................................................... 14
11.5 DEMONSTRATION OF COMPLIANCE STATUS WITH THE REQUIREMENTS OFPARTLD.3(B) AND LE.7(B) OF
THE PERMIT ................................................................................................................................................ 15
11.5.1 Permit Requirements ......................................................................................................................... 15
11.5.2 Demonstration of Compliance with Permit Requirements ................................................................ 17
12.0 SIGNATURE AND CERTIFICATION .................................................................................................... 20
i
LIST OF TABLES
Table 1 -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 lA and IB, Cell 4A and 4B Calculations
G Annual Inspection Forms for Existing and New Decontamination Pads (Part I.F.12)
11
l/i. r
WHITE MESA URANIUM MILL
DMT PERFORMANCE STANDARDS MONITORING REPORT AND CELL 4A AND
CELL 4B BAT PERFORMANCE STANDARDS MONITORING REPORTS
FOR THE 4th QUARTER OF 2011
1.0 INTRODUCTION
This is the routine Discharge Minimization Technology ("DMT") Performance Standards
Monitoring Report for the 4th quarter of 2011 (the "Quarter") prepared by Denison Mines (USA)
Corp. ("Denison"), as required under Part I.F.2 of the White Mesa Mill's (the "Mill's") State of
Utah Groundwater Discharge Permit No. UGW370004 (the "GWDP"), and the Routine Cell 4A ,
and Cell 4B Best Available Technology ("BAT") Performance Standards Monitoring Reports for
the Quarter, as required under Part I.F.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 I.D.3, I.E.7, and I.F.11 of the GWDP:
• Weekly tailings wastewater pool elevations for tailings Cells 1 and 3 (Part
I.E.7(a));
• Quarterly slimes drain water levels in Cell 2 (Part I.D.3(b)(1) and (2));
• Annual Slimes Drain Compliance (Part I.D.3 (b) and I.F.11);
• Weekly wastewater level measurements in Roberts Pond (Part I.D.3(e) and Part
I.E.7(c));
• Weekly feedstock storage area inspections and inspections of feedstock materials
stored outside of the feedstock storage area (Part I.D.3(t) and Parts I.E.7(d); and
(e));
• Any tailings cell and pond liner system repairs (Part I.E.7 (t) and Part I.E.(S)(c));
• Weekly New Decontamination Pad Inspection (Part I.E.7 (g)) and
• Annual Decontamination Pad Concrete Inspection (Part I.F .11) (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 I.E.S and I.E.12 of the
GWDP:
• Leak detection system ("LDS") monitoring for Cell 4A (Part I.E.S.(a)), and Cell
4B (Part I.E.12 (a)); and
• Weekly tailings wastewater pool elevations for tailings Cell 4A (Part I.E.S (a))
and Cell4B (Part I.E.12 (a)).
1
3.0 WEEKL Y TAILINGS WASTEWATER POOL ELEVATION MONITORING
Mill personnel monitored and recorded weekly the elevation of wastewater in Tailings Cells
during the fourth quarter 2011, 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 fms!.
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 fms!'
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 Cell4B
and a subsequent letter dated March 14, 2011, stated that authorization of the use of Cell4B 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
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
2
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 Cell4A are not required for compliance with freeboard limits but are
required for the calculation of the daily allowable volume of fluids pumped from the Cell 4A
LDS, and as such are collected.
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 LD.2 of
10.3 (fms1) the GWDP (fmsl)
CellI 5611.66 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 Q1 2011
Cell4A 5589.70 Freeboard limit No Limit No Limit
was removed in Q 1 (5,593.74**) (5,595.50**)
2011.
Cell4B 5579.28 5594.60 5597.40
* The Executive Secretary approved the removal of the Cell 3 freeboard limit and authorized the use of Cell4B 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 Cell4A freeboard limit on January 13, 2011, and approved
the removal of the Cell4A limit and authorized the use ofCell4B on January 27,2011. The previous freeboard limit
noted above for Cell4A was not set out in the License. The freeboard limit of 5,593.74 for Cell4A 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
fQr Cell 4 B that will accommodate the freeboard requirements of Cells 1, 4 A, and 4 B.
4.0 QUARTERLY SLIMES DRAIN WATER LEVEL MONITORING
4.1 General
Part I.D.3(b )(1) 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
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.
3
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. .. ". Monthly testing was conducted through
the second quarter. The frequency change dictated by the GWDP was implemented in the third
quarter 2011. The test ensures that each tailings cell 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 I.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 I.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 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, quarterly DMT Reports must include both the current year values
and a graphic comparison to the previous year. The annual slimes drain recovery head report,
that addresses the requirements of Part I.F.11 of the GWDP and Section 8.2 of the DMT Plan is
included in Section 11.0 of this 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 I.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.
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 head measurements for the Quarter required under the License, are
included as Attachment C to this Report.
4
Two sets of measurements are routinely collected from the Cell 2 slimes drain access pipe for
compliance with the GWDP and the License. The first measurement is the quarterly recovery
test which is conducted to determine the compliance with the GWDP, Part I.D.3.(b)2. The
second set of measurements collected at the Cell 2 slimes drain access pipe are the weekly pre-
and post-pump head measurements required by the License. Changes to Cell 2 were completed
during the second and third quarter 2011 which affect both sets of measurements collected from
the Cell 2 slimes access drain. A description of the changes and the effects on the measurements
are described in detail below.
4.2.1 Summary of Changes to Cell 2
On May 27, 2011, Denison submitted a notice pursuant to Part I.G.3 of the Mill's GWDP and
Utah Administrative Code ("UAC") R317-6-6.16(C)(1) that Denison failed to meet the standards
in Part I.D.3(b )(3) of the Permit. As detailed in letters to DRC dated May 27, June 17, and
August 1, 2011, Denison re-graded the interim fill on Cell 2 in order to reduce the potential for
the accumulation of stormwater on the surface of Cell 2, which could potentially infiltrate into
Cell 2. This re-grading required 62,000 cubic yards of cut and fill and was completed on July
30, 2011. As a result of the re-grading and placement of additional fill material on Cell 2, the
slimes drain access pipe was extended to bring the slimes drain access pipe above grade relative
to the new ground surface elevation. The extension pipe which is the same diameter as the
existing access pipe, was placed on top of the previous Cell 2 slimes drain access location and
was mechanically attached using metal braces and plates. The seam between the existing pipe
and the extension were sealed with caulking and an external covering to prevent infiltration by
dirt and debris. The measuring point for the extension of the slimes drain access pipe is directly
above the previous measuring point. The distance from the old measuring point to the new
extended measuring point was measured to an accuracy of 0.01 feet. The extension to the Cell 2
slimes drain access pipe measures 6.97 feet. The extension was placed July 20, 2011. The
measuring point was surveyed by a Utah-Certified Land Surveyor.
In addition to the re-grading, Denison installed a reducing neck on the pump in the Cell 2 slimes
drain to reduce the pump discharge from 2 inches to 1 inch, thus increasing the discharge head
on the pump and reducing the discharge flow rate. The sensor settings (which trigger the pump
startup) on the pump in the Cell 2 slimes drain were adjusted from 4 feet to 2 feet. As a result,
the pump rate has been slowed sufficiently to allow the pump to cycle on for a longer time at a
narrower range of solution levels, in effect, performing like a smaller pump.
4.2.2 Quarterly Recovery Test Data
As noted above, the quarterly recovery test is completed in accordance with the GWDP, dated
July 14, 2011, Part I.D.3 (b)(2). The recovery test data are collected by measuring the fluid level
in the slimes drain over an extended period of time (greater than 90 hours). The measurements
for the recovery test are taken by measuring the distance from the measuring point (which is at
the top of the Cell 2 slimes drain access pipe) to the top of the fluid present in the Cell 2 slimes
access pipe. The total depth of the Cell 2 slimes drain access pipe is not used in any of the
calculations for compliance determinations. Compliance determinations as required by the
5
GWDP rely on elevation data, which is generated by subtracting the elevations of the fluid levels
from the elevation of the top of the Cell 2 slimes drain access pipe. There will be no change in
the compliance numbers generated because the measurements are all adjusted by the same
correction. In order to make the data collected prior to July 20, 2011 comparable to the current
data for use in the graphical representation, 6.97 feet was added to all of the previous recovery
data to adjust for the height added with the extension to the Cell 2 slimes drain access pipe. The
recovery data are graphically shown in Attachment C.
4.2.3 Weekly Pre-and Post-Pump Head Measurements
As noted above, weekly pre-and post-pump head measurements are collected as required by the
License. The weekly pre-and post-pump head measurements are taken by measuring the
distance from the measuring point to the top of the fluid present in the Cell 2 slimes access pipe.
Two measurements are taken; the first measurement is taken before the pump is started and the
second is taken after the pump has run for 15 minutes. The pre-and post-pump head is
calculated by subtracting the liquid level from the total depth of the Cell 2 slimes drain.
During the measurements of the extension to the Cell 2 slimes drain access pipe, it was noted by
the field personnel that the new length of the Cell 2 slimes drain access pipe is now 37.97 feet.
The previous measurement used for the pre-and post pumping head measurements was also 38
feet and the discrepancy was noted. An investigation into the discrepancy between the previous
total depth of the Cell 2 slimes drain and the current depth of the Cell 2 slimes drain was
conducted. The investigation included a review of the as-built drawings for Cell 2, previous pre-
and post-pump measurements, and a review of the Cell 2 slimes drain access pipe procedures.
The as-built drawings and the results of the investigation indicate that the previous total depth of
the Cell 2 slimes drain was not in fact 38 feet, but 31 feet. With the extension of 6.79 feet to the
previous total depth of 31 feet, the current depth is now 37.97 feet. The pre-and post-pump data
reported to DRC only in the second and third quarter 2011 DMT Reports. The corrected second
and third quarter data are included in this report in Attachment C.
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 I.D.3(b )(2) of the
GWDP and can be used for purposes of determining compliance with the requirements of Part
LD.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
6
above), is included as Attachment D, which shows a graphic comparison of this Quarter's data to
data for 2009 and 2010.
5.0 WEEKL Y 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 I.D.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 fmsl.
The maximum wastewater elevation measured in Robert's Pond during the quarter was 5,621.62
fmsl, which did not exceed the maximum permitted elevation of 5,624 fmsl. 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
feedstock area is maintained within containers that comply with the requirements of Part I.D.ll
of the GWDP. The results of these inspections are recorded on the Weekly Mill Inspection
forms, which are available at the Mill for inspection. Three items were noted during the fourth
quarter inspections. During the weekly inspections conducted on October 7, 2011, October 14,
2011, October 28,2011, November 11,2011, December 2,2011, December 9,2011, December
16, 2011 and December 30, 2011 standing water was noted in the feedstock storage areas. The
water was the result of heavy precipitation. 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 October 28, 2011, was that the movement of the
Cabot material during transfer for processing caused the material to be closer to the fence than
normal. The utility crew was contacted immediately and was remedied and no other actions were
necessary.
The third item noted in the weekly inspection conducted on December 30, 2011, was that there
were two hydraulic fluid spills from ore trucks. The inspector noted that the spills were cleaned
up and the soil was placed on Cell 3.
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
7
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 CellI 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,
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 l.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. 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
8
Part I.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 4th
quarter 2011.
Table 2 -New Decontamination Pad Inspection Portal Level for the Fourth Quarter 2011
Portal 1 Portal 2 Portal 3
Liquid Level Liquid Level Liquid Level
Date (in Feet) (in Feet) (in Feet)
10/7/2011 0.00 0.00 0.00
10114/2011 0.00 0.00 0.00
10/2112011 0.00 0.00 0.00
10/28/2011 0.00 0.00 0.00
1114/2011 0.00 0.00 0.00
1111112011 0.00 0.00 0.00
11118/2011 0.00 0.00 0.00
11125/2011 0.00 0.00 0.00
12/2/2011 0.00 0.00 0.00
12/9/2011 0.00 0.00 0.00
12/16/2011 0.00 0.00 0.00
12/23/2011 0.00 0.00 0.00
12/30/2011 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 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 I.D.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.
9
8.2 Annual Inspection of Existing Decontamination Pad
As required by Part I.F.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 10-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.
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 I.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
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
CeIl4A.
10
Ce1l4B
There was one failure of the monitoring equipment in Cell 4B LDS which was not made
operational within 24-hours of discovery, as contemplated by Part I.E. 12(a)(l) of the OWDP for
Cell 4B. It is important to note that the pumping equipment for Cell 4B LDS remained fully
operational throughout the quarter, but the electronic flow totalizer associated with the Cell 4B
LDS malfunctioned during the quarter. On November 3, November 29, December 5, and
December 13, 2011, the flow totalizer in Cell 4B indicated that fluid had been pumped from the
Cell4B LDS. On all of these dates, the pump was off, the flow rate meter indicated no flow, and
the pump start indicator did not indicate any pump starts. The Mill Personnel conducted a test by
temporarily re-routing the pump discharge to a collection bucket to confirm whether there was
pump flow at the time that the totalizer indicated flow. The pump did not discharge any fluid,
and the processor monitor screen correspondingly indicated zero flow rate. The LDS gallons
reported on those days are erroneous totals (the reported values are higher than the actual
pumped values). For conservatism, the reported gallons pumped in Attachment F for both
November and December incorporate the erroneous (higher values) collected from the
malfunctioning totalizer.
Detailed information regarding the root cause, corrective actions and the affirmative defense
surrounding this issue are included in the Notice pursuant to Part 1.0.3 of the OWDP which was
submitted to UDEQ on December 6, 2011 and is included in Attachment B of this report.
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.
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 1.E.8(a)(2) of the OWDP. During the
Quarter, the fluid head in the Cell 4A LDS sump did not exceed 14.0 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 4 B LDS sump exceed a I-foot level above the lowest point in the lower FML on the Cell
floor, as stipulated by Part 1.E.12(a)(2) of the OWDP. 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 Cell4B sump did not exceed 4.08 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.
11
Ce1l4A
As can be seen from a review of Attachment F, no fluids were pumped from the Cell4A LDS for
the fourth quarter of 2011. Based on this, 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.
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.
However, the weekly wastewater elevations were completed in order to calculate the maximum
daily allowable flow volume, based on in the Cell 4A BAT Operations and Maintenance Plan.
Based on the wastewater pool elevation surveys conducted during the quarter, and the maximum
head recorded on the FML during the Quarter of approximately 34 feet, the allowable flow rate
would be approximately 587.5 gallons/acres/day, as determined under the Mill's Cell 4B BAT
Operations and Maintenance Plan, Table 1A (also included in Attachment F of this report), and
assuming a liner elevation of 5555.55 feet and approximately 39 acres of liquid area. The
average daily flow volume in Cell 4A did not exceed the calculated flow volume of 23,100
gallons/day. As mentioned above, during fourth quarter 2011, no fluids were pumped from Cell
4A LDS during the entire period. The third quarter allowable flow rate calculation for Cell4A is
included in Attachment F of this report.
Ce1l4B
As can be seen from a review of Attachment F, fluids were pumped from the Cell 4B LDS for
the fourth quarter of 2011 were below the 26,145 gallons/day, as stipulated by Part LE.12(a)(3)
of the GWDP.
Based on the wastewater pool elevation surveys conducted during the quarter, the maximum
head recorded on the FML during the Quarter was about 21.78 feet. The allowable flow rate
would therefore be approximately 444.08 gallons/acres/day, as determined under the Mill's Cell
4B BAT Operations and Maintenance Plan, Table 1B (also included in Attachment F of this
report), and assuming a liner elevation of 5557.5 feet and approximately 34.6 acres of liquid
area. The average daily flow volume in Cell 4B did not exceed the calculated flow volume of
15,351 gallons/day. During third quarter 2011, a total of 261 gallons were pumped from Cell4B
LDS during the entire period, or an average of 2.83 gallons per day. The fourth quarter
allowable flow rate calculation for Cell4B is included in Attachment F of this report.
9.2 Measurement of Weekly Wastewater Fluids in Cells 4A and 4B
Weekly fluid elevations for Cells 4Aand 4B for the quarter are provided in Attachment A along
with elevations for Cell 1 and Roberts Pond.
12
9.3 Slimes Drain Recovery Head Monitoring
As the Mill has not initiated pumping conditions in the Cell4A or Cell4B 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 I.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, 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.
For Cell 1, during the fourth 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 fourth 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.
13
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
This Section constitutes the annual slimes drain recovery head report for calendar year 2011 (the
"Period"), as required under Parts I.D.3 (b) and I.F.11 of the Permit and Section 8.2 of the DMT
Plan.
11.1 Individual Slimes Drain Recovery Head for 2011
The individual slimes drain recovery head monitoring data for calendar year 2011, 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, is included as Attachment C to this Report. The equivalent
recovery water level elevation is determined by subtracting the final depth to stable water
measurement (as recorded on the sheets in Attachment C) from the elevation of the measuring
point. Those elevations are set out in Tables 4,5, and 6 below.
11.2 Average Slimes Drain Recovery Head for 2011
The slimes drain recovery head for Cell 2 for calendar year 2009, 2010, and 2011 are shown in
Tables 4, 5, and 6 below.
11.3 Time Series Chart
Included in Attachment D is a time series chart that shows trends in the monthly recovery water
level elevations in the Cell 2 slimes drain over time, using data that meet the test performance
standards found in Part I.D.3(b )(2) of the Permit. See Section 11.4 below.
11.4 Quality Assurance Evaluation and Data Validation
Denison management has evaluated all data collected, data collection methods, and all related
calculations required by the Permit, and has 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:
1. All of the 2009 monthly slimes drain tailings fluid elevation measurements meet the
test performance standards found in Part I.D.3(b)(2) of the Permit and can be used for
14
purposes of determining compliance with the requirements of Part LD.3(b)(2) of the
Permit.
2. All of the 2010 monthly slimes drain tailings fluid elevation measurements meet the
test performance standards found in Part I.D.3(b )(2) of the Permit and can be used for
purposes of determining compliance with the requirements of Part I.D.3(b)(2) of the
Permit.
3. All of the 2011 slimes drain tailings fluid elevation measurements (monthly through
June 2011 and quarterly thereafter) meet the test performance standards found in Part
I.D.3(b)(2) of the Permit and can be used for purposes of determining compliance
with the requirements of Part LD.3(b )(2) of the Permit.
11.5 Demonstration of Compliance Status with the Requirements of part I.D.3(b) and
I.E. 7 (b) of the Permit
11.5.1 Permit Requirements
Part LD.3 f the Permit provides that annual slimes drain compliance shall be achieved when the
average annual wastewater recovery elevation in the slimes drain access pipe, as determined
pursuant to the DMT Plan, meets the conditions in Equation 1, below:
Equation 1:
[LEy + LY-l + L y-2] / Ny + N y-l + N y-2] < [LEy-1 +Ly-2+ L y-3] / N y-l + N y-2+ N y-3]
Where:
LEy =
LEy-1=
Ny =
Sum of all monthly slimes drain tailings fluid elevation measurements that meet
the test performance standards found in Part LD.3(b )(2), during the calendar year
of interest. Hereafter, these water level measurements are referred to as slimes
drain recovery elevations (SDRE). Pursuant to the DMT Plan, these recovery
tests are to be conducted monthly and the SDRE values reported in units of feet
above mean sea level (amsl).
Sum of all SDRE measurements made in the year previous to the calendar year of
interest.
Sum of all SDRE measurements made in the second year previous to the calendar
year of interest.
Sum of all SDRE measurements made in the third year previous to the calendar
year of interest.
Total number of SDRE tests that meet the test performance standards found in
Part I.D.3(b )(2), conducted during the calendar year of interest.
15
N y-1 =
Ny-2 =
Ny-3 =
Total number of SDRE tests that meet the test performance standards found in
Part lD.3(b )(2), conducted in the year previous to the calendar year of interest.
Total number of SDRE tests that meet the test performance standards found in
Part lD.3(b )(2), conducted in the second year previous to the calendar year of
interest.
Total number of SDRE tests that meet the test performance standards found in
Part lD.3(b )(2), conducted in the third year previous to the calendar year of
interest.
Part lD.3 further provides that prior to January 1, 2013, the following values for E and N in
Equation I shall be based on SDRE data from the following calendar years.
Table 3 -SDRE Data to be Used for Certain Years
Report Source of Data By Calendar Year for Equation 1 Variables (right
for side)
Calendar Ey-1 Ey-2 Ey-3 Ny-1 Ny-2 Ny-3
Year
2010 2009 2009 2009 2009 2009 2009
2011 2010 2009 2009 2010 2009 2009
2012 2011 2010 2009 2011 2010 2009
Part lD.3 provides that failure to satisfy conditions in Equation 1 shall constitute DMT failure
and non-compliance with the Permit, and that for Cell 3, this requirement shall apply after
initiation of de-watering operations.
16
11.5.2 Demonstration of Compliance with Permit Requirements
2011 SDRE values that meet the test performance standards found in Part I.D.3(b)(2), reported in
units of FMSL are as follows:
Table 4 -Cell 2 Slimes Drain Recovery Head and SDRE Values for 2011
Elevation of Reported Highest SDRE Values
2011 Test Closing Measurement Point Level (feet) (Reported as fmsl)**
Date (fmsl) * *
112112011 5611.76 13.15 5598.61
2/28/2011 5611.76 10.42 5601.34
3/18/2011 5611.76 11.31 5600.45
4/25/2011 5611.76 11.57 5600.19
5/20/2011 5611.76 13.17 5598.59
6/23/2011 5611.76 12.18 5599.58
7/19/2011 *** 5611.76 12.59 5599.17*
12119/2011 *** 5618.73 19.83 5598.9*
LE2011 = 67,192.97
N2011=12*
*Per the requirement of the GWDP Part I.D.3 when monthly and quarterly measurements are combined in the GWDP required
equation, the quarterly values shall be multiplied by a coefficient of three (3). ** The standpipe elevation was surveyed in 2011, which indicated that the elevation of the measuring point of 5614.83 feet
above mean sea level (fmsl) reported to date (prior to the Cell 2 slimes drain access pipe extension) was 3.07 feet higher than the
2011 survey result of 5611.76 fmsl (prior to the Cell 2 slimes drain access pipe extension). These corrections have no effect on
the resulting slimes drain elevation values listed in and used in the calculations below.
***Per the Permit Part I.D.3.(b).2 effective July 11, 2011, the frequency of the Cell 2 slimes drain recovery tests was changed
from monthly to quarterly.
2010 SDRE values that meet the test performance standards found in Part I.D.3(b)(2), reported in
units of FMSL are as follows:
17
Table 5 -Cell 2 Slimes Drain Recovery Head and SDRE Values for 2010
Elevation of Reported Highest SDRE Values
2010 Test Closing Measurement Point Level (feet) (Reported as fmsl)**
Date (fmsl) * *
1115/2010 5611.76 13.96 5597.8
2/2112010 5611.76 12.50 5599.26
3/15/2010 5611.76 11.04 5600.72
4112/2010 5611.76 10.40 5601.36
5119/2010 5611.76 10.43 5601.33
6/30/2010 5611.76 10.13 5601.63
8/2/2010 5611.76 10.74 5601.02
8/25/2010 5611.76 10.65 5601.11
9/24/2010 5611.76 11.50 5600.26
10/25/2010 5611.76 12.35 5599.41
11123/2010 5611.76 10.81 5600.95
12/22/2010 5611.76 11.58 5600.18
LE2olO = 67,205.03
N2010=12
** The standpipe elevation was surveyed in 2011, which indicated that the elevation of the measuring point of 5614.83 feet
above mean sea level (fmsl) reported to date (prior to the Cell 2 slimes drain access pipe extension) was 3.07 feet higher than the
2011 survey result of 5611.76 fmsl (prior to the Cell 2 slimes drain access pipe extension). These corrections have no effect on
the resulting slimes drain elevation values listed in and used in the calculations below.
18
2009 SDRE values that meet the test performance standards found in Part I.D.3(b )(2), reported in
units of FMSL are as follows:
Table 6 -SDRE Values for 2009
2009 Test Closing Elevation of Reported Highest SDRE Values
Date Measurement Point Level (feet) (Reported as fmsl)**
(fmsl) **
1/30/2009 5611.76 11.25 5600.51
2/27/2009 5611.76 9.35 5602.41
3/28/2009 5611.76 8.84 5602.92
4/27/2009 5611.76 11.98 5599.78
5/20/2009 5611.76 10.28 5601.48
6/22/2009 5611.76 13.00 5598.76
7/30/2009 5611.76 13.00 5598.76
8/31/2009 5611.76 11.04 5600.72
9/28/2009 5611.76 11.46 5600.3
10/30/2009 5611.76 13.35 5598.41
11123/2009 5611.76 12.49 5599.27
12/14/2009 5611.76 13.12 5598.64
2:E2009 =67,201.96
N2009 = 12
** The standpipe elevation was re-surveyed in 2011, which indicated that the elevation of the measuring point of 5614.83 feet
above mean sea level (fmsl) reported to date (prior to the Cell 2 slimes drain access pipe extension) was 3.07 feet higher than the
2011 survey result of 5611.76 fmsl (prior to the Cell 2 slimes drain access pipe extension). These corrections have no effect on
the resulting slimes drain elevation values listed in and used in the calculations below.
Based on the foregoing, it is evident that 2:E2011 = 67,192.97 fmsl, and N2011 = 12, 2:E201O =
67,205.03 fmsl, and N201O= 12, and that 2:E2oo9 = 67,201.96 fmsl, and N2009= 12
Also, based on Table 3 above, for year 2011,
Ey-1 = 2010, Ey-2 = 2009, Ey-3 = 2009 and Ny-1 = 2010, Ny-2 = 2009, and Ny-3 = 2009.
Based on these values, equation 1 can be applied as follows:
[2:Ey + 2:Ey-1 + 2:Ey_2 ] I [Ny + Ny-1 + Ny-2] = [67,192.97 + 67,20303 + 67,201.96]/[12 + 12
+12] = 5600.00 fmsl
and
[2:Ey-1 + 2: Ey-2 + 2:Ey-3 ] I [ Ny-1 + Ny-2 + Ny-3 ] =[67,205.03 + 67,201.96 + 67,201.96]/[12 + 12
+ 12] = 5600.25 fmsl
Based on the above equation, the annual slimes drain compliance has been achieved for Cell 2 in
2011, in accordance with Part I.D.3 of the Permit.
19
12.0 SIGNATURE AND CERTIFICATION
This document was prepared by Denison on February 27,2012.
) Corp.
By:
----,----"._---_.
David C. Fryd nlund
Vice President, Regulatory Affairs and Counsel
20
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.
D rydenlund
Vice President, Regulatory affairs and Counsel
Denison Mines (USA) Corp.
21
Attachment A
Date
Free Board
Limit under the
License 1
10/7/2011
10/14/2011
10/2112011
10/28/2011
1114/2011
1111112011
11118/2011
11125/2011
12/2/2011
12/9/2011
12116/2011
12/23/2011
12/30/2011
5615.40
5610.77
5610.66
5610.74
5610.94
5611.04
5611.30
5611.48
5611.57
5611.60
5611.59
5611.66
5611.61
5611.61
Tailings Pond Elevations
4th Quarter Elevations
Cell 3 2 Roberts Pond
5602.50 5624.00
No longer required 5620.96
No longer required DRY
No longer required 5620.42
No longer required 5620.62
No longer required 5619.20
No longer required 5621.62
No longer required 5619.26
No longer required 5619.55
No longer required 5619.04
No longer required 5619.95
No longer required 5619.23
No longer required 5619.85
No longer required 5621.52
Ce1l4A 3 Ce1l4B 4
5593.74 5594.60
5585.94 5579.28
5585.98 5579.21
5585.89 5579.11
5585.60 5579.04
5585.21 5578.89
5585.37 5579.00
5585.74 5578.92
5586.48 5578.91
5587.07 5578.81
5587.77 5578.76
5588.13 5578.75
5587.51 5579.28
5589.70 5578.84
1 The freeboard limit as permitted under License condition 10.3 is no longer applicable to Cell 3 or CeIl4A.
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 4 B on January 27, 2011. The weekly measurements are no longer required for compliance with freeboard
limts, but are required to calculate the daily permissable leakage rate for CeIl4A.
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 Cell 4 B at this time.
Attachment B
OENISOJ)~~
MINES
December 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: [phone]
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") R317-6-6.16(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 I.D.12a) 1)'of the Permit, as a result of a malfunctioning
flow totalizer in the Cell 4B leak detection system ("LOS"), as described in more detail below.
The malfunction was discovered on Thursday, December 1,2011. Initial notice of this failure to maintain BAT
was given by telephone to Mr. David Rupp of the Utah Department of Environmental Quality at 1 :55pm on
Thursday December 1, 2011 at 801 -536-4023 (within 24 hours of the discovery).
1. Facts and Background Information
a) DRC provided authorization for use of Cell 4B on January 27,2011.
b) Part 1.E.12 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."
c) Daily monitoring of the Cell 4B LOS prior to the week of November 22, 2011 indicated that the
components of the pumpng and flow monitoring system (pump, pump controller, flow meter, flow
totalizer, and all other components) were working properly. Due to the design of the LOS head
monitoring and pumping system, the pump sometimes has no pump starts for as many as several
weeks while sufficient head builds up in the LOS to trigger the pump start. Therefore, the system may
be working properly even if no pump starts or flow have been recorded for an extended time.
Y:\Notices\CeIl4B LDS Notice 12.06.11\12.06.11 Notice to RLundberg Cell4B LDS.doc
Letter to Mr. Rusty Lundberg
December 6, 2011
Page 2
d) Daily monitoring of the Cell 48 LDS on November 3, 2011 indicated that the flow totalizer had
counted gallons pumped even though the indicator for the number of pump starts had not changed
since the previous daily inspection. Mill personnel contacted the supplier, Envirnmental Pump
Solutions to receive a software upgrade to potentially correct the disconnection between the pump
start indicator and the flow totalizer.
e) The software upgrade for the Cell 48 processor was installed and tested on November 4,2011, within
24 hours. Ongoing montioring also included a manual pump test of the Cell 48 LDS pump and
controller, to confirm it was working properly. The system appeared to function properly.
f) Daily monitoring of the Cell 48 LDS on November 22, 2011 indicated that the pump controller, flow
meter, and all other components except the flow totalizer were working properly. The flow totalizer
was again indicating that gallons were being pumped, at the same time as the pump itself appeared
to be off, the flow rate meter indicated no flow, and the pump start indicator did not indicate any
pump starts. That is, the totalizer appeared to be over-reporting LDS flow.
g) Mill environmental personnel reported the finding to the Mill manager and to Mill engineering
personnel on November 22, 2011. Mill engineering personnel began immediate email and telephone
communications with the supplier to diagnose and troubleshoot the potential malfunction.
h) Diagnostic tests and troubleshooting, in coordination with the supplier, continued through December
1, 2011. During this period, a check on November 29, 2011 indicated that while the pump controller,
flow meter, and all other components except the flow totalizer were working properly, the flow totalizer
indicated 6 gallons of flow when the pump itself was off and its flow meter indicated no flow. Mill
personnel conducted a test by temporarily re-routing the pump discharge to a collection bucket to
confirm whether there was pump flow at the time that the totalizer indicated flow. The pump did not
discharge any fluid, and the processor monitor screen correspondingly indicated zero flow rate, while
the totalizer indicated 6 gallons of additional flow.
i) Mill environmental personnel, Mill engineering personnel, and Corporate environmental management
dicussed the corrective steps taken and status of the totalizer performance on December 1, 2011.
They concurred that steps to date had not corrected the problem, and that the totalizer would not
record properly without either 1) scheduling a supplier team to come to the Mill site, or 2) a potential
equipment replacement.
j) Corporate environmental management determined on December 1, 2011 that notification to DRC of
the status of troubleshooting and repair plans was required under Part I.G.3 of the Permit and UAC
R317-6-6.16(c).
2. Action Taken
a) Corporate Environmental personnel determined on December 1, 2011 that the totalizer was indeed
over-recording flow and repair could not be completed without a supplier visit or shipment of parts.
b) Verbal notification was given to the DRC at 1 :55pm on December 1, 2011, within 24 hours of
discovery. This verbal notification was followed by this written notification within five days of
discovery.
OENISOJ)~
MINES
Letter to Mr. Rusty Lundberg
December 6,2011
Page 3
c) Environmental Pump Solutions determined on December 2, 2011 that a replacement of the digital
processor would be required.
d) A replacement digital processor was received at the Mill on December 6,2011.
e) Installation was completed on December 6, 2011. System checking and startup was completed on
December 6, 2011.
f) Daily inspection and monitoring of the system continues to confirm that the repair has corrected the
over-recording problem.
3. Root Cause
The root cause analysis is as follows
a) The flow totalizer is one of the data input devices whose data is controlled in the data processor. It
was deternmined that the nature of the failure to correctly record flow totalizer numbers could not be
corrected by repair or raplacement of processor software, and that the data processor required
replacement.
4. Actions That Will be Taken to Prevent a Reoccurrence of this Incident
The following actions will be taken to prevent a reoccurrence of this incident:
a) Mill personnel installed a replacement for the malfunctioning processor.
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:
a) Notification
By virtue of the initial oral notification given to ORC at 1 :55 PM on Thursday, December 1, 2011 (within 24
hours of the discovery) and this written notice, Denison has submitted notification according to Part I.G.3 of
the Permit and UAC R317-6-6.13.
b) Failure was not Intentional or Caused by the Permittee's Negligence
The failure to accurately measure the fluid volume pumped from the Cell 4B LOS was not caused by
Denison's negligence, either in action or in failure to act. The processor which records the gallons pumped
from the flow totalizer malfunctioned. Mill personnel discovered the malfunction and initiated diagnosis, in
conjunction with the manufacturer, and repair in a timely manner.
OENISOJ)J~
MINES
Letter to Mr. Rusty Lundberg
December 6, 2011
Page 4
c) The Permittee has Taken Adequate Measures to Meet Permit Conditions
Mill personnel confirmed that the LDS head level monitoring equipment, LDS pump, and pump flowmeter were
functioning throughout the entire period of diagnostics and repair. The LDS pumping circuit was and continues
to operate properly. The maximum allowable head was and continues to be measured correctly. Even based
on the artificially elevated LDS flow data, the system has not exceeded the maximum allowable daily LDS flow
rate. As soon as it was determined that the LDS flow totalizer may be in error, diagnostic and repair measures
were immedately implemented to reinstitute correct reading of the flow totalizer rates.
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 measurement inaccuracy. Diagnostics of the system were initiated imiediately upon Mill personnel's
identification of the potential malfunction. A replacement processor was ordered as soon as the
manufacturer's diagnostics determined it was the source of the malfunction. Arrival of the replacement
processor and installation was completed during the week of December 5, 2011.
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
cc: Dan Hillsten
David C. Frydenlund
Harold R. Roberts
David E. Turk
Central files
OENISOJ)~~
." MINES
Attachment C
MONTHLY HEAD MEASUREMENT TEST
January-II
location: Date: 1/21/2011
Slimes Cell # 2
Sampler: Tanner Holliday
Garrin Palmer, Ryan Schierman
1/17/2011 1/18/2011 1/19/2011 1/20/2011 1/21/2011
600
700 16.15 15.10 14.13 13.74 13.15
800 16.09 15.08 14.13 13.73 13.15
._--
900 16.03 15.06 14.12 13.73 13.15
1000 15.98 15.04 14.05 13,72
1100 15.92 15.00 14.03 13.69
1200 15.86 14.95 14.00 13.67
1300 15.79 14.89 13.96 13.64
1400 15.73 14.84 13.92 13.59
1500 15.69 14.80 13.90 13.55
1600
All measurements are in inches.
Comments: Report number is 13.15 for the month of January.
The tested started with a partialy recovered head because there was an unplanned
power loss to the tailings area over the weekend which allowed the head to recover
for a day and a half to two days beforetheillonthly head recovery test: was started.
they continue to have some problems with the power supply out on the tailings area.
We may continue to see some problems with the slimes drain on Cell 2 until these
issues are resolved.
)
MONTHLY HEAD MEASUREMENT TEST
Location: Date: 2/28/2011
Slimes Cell # 2
Sampler: Tanner Holliday
Garrin Palmer
2/21/2011 2/22/2011 2/23/2011 2/24/2011 2/25/2011 2/28/2011
600
700 14.7 12.73
SOD 14.59 12.7 11.8 11.82
900 14.47 12.63 11.79 11.2
1000 14.35 12.6 11.77 11.18
1100 14.22 12.56 11.73 11.18
1200 14.1 12.5 11.69 11.15
1300 13.96 12.44 11.65 11.11
1400 13.87 12.38 11.63 11.03
1500 24.S5 13.77 12.32 11.6 10.99
1600
All Measurements are in inches.
Comments: Test got started late on th 21st and ran over the weekend. The stable
readings were taken the following Monday mornjng on the 28th. The number being
used as stable head for the report is 10.42. feet.
10.42
10.42
10.42
MONTHLY HEAD MEASUREMENT TEST
Location: Date: 3/18/2011
Slimes Cell # 2
Sampler: Tanner Holliday
Garrin Palmer
3/14/2011 3/15/2011 3/16/2011 3/17/2011 3/18/2011
600
700 14.45 12.61 11.76 11.32
800 24.75 14.31 12.56 11.73 11.31
900 23.25 14.19 12.53 11.71 11.31
1000 22.31 14.05 12.50 11.69 11.31
1100 21.21 13.92 12.46 11.66
--..
1200 20.68 13.82 12.42 11.64
1300 19.78 13.72 12.36 11.62
1400 19.25 13.61 12.30 11..60
1500 18.76 13.53 12.22 11.52
1600
All measurements are in inches.
Comments: The report number for the month of March is 11.31 ------------~~-----------------------------------
MONTHLY HEAD MEASUREMENT TEST
location: Date: 4/25/2011
Stimes Cell # 2
Sampler: Tanner Holliday
Garrin Palmer
4/19/2011 4/20/2011 4/21/2011 4/22/2011 4/23/2011 4/24/2011 4/25/2011
600
700 24.48 15.40 13.69 12.94 11.57
800 23.02 15.26 13.68 12.91 11.57
900 22.23 15.12 13.68 12.88 11.57
1000 21.52 15.03 13.67 12.86
1100 20.80 14.95 13.61 12.82
1200 20.37 14.82 13.50 12.81
1300 19.73 14.77 13.40 12.78
1400 19.40 14.63 13.35 12.75
1500 19.01 14.61 13.29 12.72 11.65
1600
Comments: The report number for the month of April is 11.57
The Head test was started on a Tuesday due to some minor power issues that needed to .
be adressed on Monday the 18th. . .....
MONTHLY HEAD MEASUREMENT TEST
Location: Date: 5/20/2011
Slimes Cell # 2
Sampler: Tanner Holliday
Garrin Palmer
5/16/2011 5/17/2011 5/18/2011 5/19/2011 S/20/2011
600
700 24.89 16.55 14.61 13.69 13.20
800 23.45 16.44 14.55 !l.6S 13.19
900 22.85 16.30 14.48 13.63 13.18
1000 21.91 16.20 14.41 13.61 13.17
1100 21.53 16.07 14.36 13.58 13.17
1200 21.10 15.95 14.32 13.56 13.11
1300 20.52 15.85 14.27 13.54
1400 20.09 15.76 14.22 13.52
1500 19.75 15.64 14.16 13.50
1600
13.17
Comments: the report number is 13,17 for the month of May.
MONTHLY HEAD MEASUREMENT TEST
location: Date: 6/23/2011
Slimes CelJ # 2
Sampler: tanner Holliday
Ryan Shierman
6/13/2011 6/14/2011 6/15/2011 6/16/2011 6/17/2011 6/18/2011 6/20/2011
600
700 24.90 17.16 15.28 14.14 13.55 13.04 12.18
800 23.90 17.05 15.24 14.10 13.49 12.18
900 23.26 16.95 15.20 14.05 13.47 12.18
1000 22.49 16.84 15.17 14.02 13.46
1100 21.95 16.71 1S.11 13.99 13.46
1200 21.53 16.63 15.03 13.95 13.45
1300 21.01 16.55 14.95 13.91 13.43
1400 20.51 16.40 14.87 13.86 13.40
1500 19.97 16.31 14.79 13.79 13.32
'1600
12.18
Comments The report number is 12.18 for the month of June 2011.
I MONTHL V HEAD MEASUREMENT TEST
Location: Date: 7/20/2011
Slimes CeU # 2
Sampler: Ryan Sheirman
Ryan Palmer
7/11/2011 7/12/2011 7/13/2011 7/14/2011 7/15/2011
600
700 23.81 17.50 15.81 14.89 14.12
800 23.24 17.43 15.75 14.85 14,09
900 22.91 17.27 15.73 14.82 14,07
1000 22.3 17.21 15.70 14,78 14.05
1100 21.9 17.16 15.64 14.73 14.02
1200 21.48 17.06 15.61 14.71 14.00
1300 21.15 16.95 15.55 14.66 13.97
1400 20.82 16.90 15.49 14.63 13.95
1500 20.41 16.84 15.43 14.59
1600
Comments: Additional readings were taken on Saturday the 16th and Sunday the 17th.
Saturday at 1800 hrs the level was 13.17 feet.bnSundayat 1700·hours the level was 12.70
feet. The report number will be 12.S9wt1ich waStaken on the 19th.
The slimes drain pipe and theLDS pipe on Cell 2 will have to be raised up to maintain
.... a reasonable amounfof exposed pipe above ground elevation. The dirt work is moving
forward and pipes will be extendecfwith in the next week to ten dayS.
7/19/2011
12.59
12.59
12.59
12.59
QUARTERLY HEAD MEASUREMENT TEST
Location: Date: 12119/2011
Slimes Cell # 2
Sampler: Garrin Palmer
Tanner Holliday
12112111 12113111 12114111 12115111 12/16111 12117111 12118111 12119111
600
700 35.55 26.24 23.90 22.7 21.94 19.83
800 34.63 26.09 23.81 22.63 21.94 19.83
900 33.69 25.85 22.57 21.93 19.83
1000 32.78 25.61 23.72 22.55 21.91 21.30 20.31
1100 32.13 25.67 23.63 22.51 21.88
1200 31.89 25.43 23.59 22.48 21.84
1300 31.22 25.29 22.47 21.8
1400 30.74 25.12 23.52 22.44 21.77
1500 29.99 24.95 23.48 22.42 21.76
1600
19.83
Comments:
Two readings were missed on 12114 because of monthly GW samplin~ event.
Readings were taken Saturday the 17th and Sunday the 18th.
The final number will be 19.83
The slimes drain was extended on Cell 2 when the cell's final cover was placed.
The slimes two head measurement is now 45' which is up from 38' previously.
Corrected 2nd 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)
4/1/2011 24.01 25.04 6.99 5.96 yes
4/8/2011 24.6 25.55 6.4 5.45 yes
4/15/2011 N/A 1 N/A 1 NC NC yes
4/22/2011 N/A 2 N/A 2 NC NC yes
4/29/2011 24.55 25.37 6.45 5.63 yes
5/6/2011 23.65 24.98 7.35 6.02 yes
5/13/2011 23.88 25.96 7.12 5.04 yes
5/20/2011 N/A 3 N/A 3 NC NC yes
5/27/2011 24.25 25.45 6.75 5.55 yes
6/3/2011 25.45 25.75 5.55 5.25 yes
6/10/2011 24.96 25.9 6.04 5.1 yes
6/17/2011 N/A 4 N/A 4 NC NC yes
6/24/2011 20.18 23.67 10.82 7.33 yes
7/1/2011 16.65 19.52 14.35 11.48 yes
N/A1 -4/15/2011, Unable to perform test due to a leaking flange. Pump is operational but turned
off and waiting for maintenance to fix.
N/A2 -4/22/2011, Unable to perform due to monthly recovery test.
N/A3 -5/20/2011, Unable to perform due to monthly recovery test.
N/A4 -6/17/2011, Unable to perform due to monthly recovery test.
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 = (31 (ft) -depth to liquid pre-pump)
Post-pump head = (31 (ft) -depth to liquid post-pump)
* Corrections were made to the total depth of the Cell 2 slimes drain access pipe as discussed in
Section 4.0 of the 4th Quarter 2011 DMT report. The corrected depth of 31 feet was noted after
the extension was added to the Cell 2 slimes drain access pipe.
Corrected 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 12.51 8.89 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 2.65 0.51 yes
8/5/2011 35.7 36.2 2.27 1.77 yes
8/12/2011 23.5 26.93 14.47 11.04 yes
8/19/2011 35.95 36.1 2.02 1.87 yes
8/26/2011 35.81 36.19 2.16 1.78 yes
9/2/2011 36.11 37.16 1.86 0.81 yes
9/9/2011 35.71 35.85 2.26 2.12 yes
9/16/2011 35.7 36.97 2.27 1 yes
9/23/2011 35.99 36.3 1.98 1.67 yes
9/30/2011 35.63 35.98 2.34 1.99 yes
N/ A 1 -7/15/2011, Unable to perform due to recovery test.
N/ A 2 -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.
* Corrections were made to the total depth of the Cell 2 slimes drain access pipe as discussed in
Section 4.0 of the 4th Quarter 2011 DMT report. The corrected depth of 31 feet was noted after the
extension was added to the Cell 2 slimes drain access pipe.
* *-As of 7/29/2011, a 6.97 foot extension was added to the slimes pipe on Cell 2. Pre-pump and
post-pump head measurements for the head calculation are now 37.97 feet. Measurements taken
before 7/29/11 are calculated using the old measurement of 31 feet. In addition the sensor settings
(which trigger pump startup) have been adjusted from 4 feet to 2 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 = (37.97(ft) -depth to liquid pre-pump)
Post-pump head = (37.97 (ft) -depth to liquid post-pump)
4th 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)
10/7/2011 * 28.03 30.11 9.94 7.86 yes
10/14/2011 35.89 36.05 2.08 1.92 yes
10/21/2011 27.15 31.40 10.82 6.57 yes
10/28/2011 28.15 32.40 9.82 5.57 yes
11/4/2011 34.31 35.29 3.66 2.68 yes
11/11/2011 34.99 35.89 2.98 2.08 yes
11/18/2011 34.91 35.97 3.06 2.00 yes
11/25/2011 * 27.93 30.91 10.04 7.06 yes
12/2/2011 26.17 30.97 11.80 7.00 yes
12/9/2011 35.21 36.09 2.76 1.88 yes
12/16/2011 N/A N/A N/C N/C yes
12/23/2011 35.10 36.07 2.87 1.90 yes
12/30/2011 35.63 37.13 2.34 0.84 yes
N/A -Unable to perform due to recovery test.
NC -Head levels not calculated, because no measurement was taken this week.
* The electrical power to the pump was interrupted and the power to the pump electrical system was
off when Field Personnel arrived for inspection. The power protection system was reset and the
pump was started as required.
The pre and post-pump head level calculations are done as follows:
Pre-pump head = (37.97(ft) -depth to liquid pre-pump)
Post-pump head = (37.97 (ft) -depth to liquid post-pump)
White Mesa Mill-Standard Operating Procedures
Book 11: Environmental Protection Manual, Section 3.1
01111 Revision: Denison 11.1
Page 28 of49
Date: lD 111::tOll
1. Pond and Beach
elevations (msl, ft)
APPENDIX A (CONT)
DENISON MINES (USA) CORP.
WEEKLY TAILINGS INSPECTION
CellI: (a) Pond Solution Elevation 5~fO.77
(b) FlvlL Bottom Elevation ___ 5597 __ _
(c) Depth of Water above FML «a)-(b)) _~r:S=:...: . ....!.7...:..1 __ _
Ce1l4A: (a)Pond Solution Elevation SStsA'1
(b)FML Bottom Elevation __ 5555.14_
(c)Depth of Water above FML «a)-(b» 5 0 .<$
Ce1l4B: (a)Pond Solution Elevation
Roberts
(b)FML Bottom Elevation 5557.50
(c)Deptb of Water above FML «a)-(b» pJ.1i5
(d)Elevation of Beach Area with Highest Elevation
(monthly)
Pond: (a)Pond Solution Elevation .5(.;10. ~h
(b)FML Bottom Elevation __ --:-5612.3-
(c )Depth of Water above FML « a)-(b» _---logL..... . .=b..;;.b __
2. Slimes Drain Liquid Levels Cell 2 Pump functioning properly >-fe.'
(,. j: I WI>.'" +r'\?peA ~
R(:~.t OJ'\~ f~fe~,
_---:@..::;..".:..J.J8w·O"'-:)....t.-__ DepthtoLiquidpre-pump
___ 3~O~. iLL1 __ Depth to Liquid Post-pump
(all measurements are depth-in-pipe)
3.1 ~ Cf 7
Pre-pumo head is tI' -Depth to Liquid Pre-pump =
i &,4 '31 .'l7
Post-pump .h~ad is .... ' -Depth to Liquid Post-
pump = 7'\~~
C:\Documents and Settings\dtwk.DMC\Local Settings\Temporary Internet Flles\Content.OuQook\VM3Y6S1l\Tailings Mgnt System and DMT
Mon Plan Nov 2010 Rv 11 1 -Redline.doc
:<) ~ .... ,-,
.'.-......
White Mesa Mill -Standard Operating Procedures
Book II: Environmental Protection Manual, Section 3.1
3. Leak Detection Systems
Observation:
CellI Cell 2 Cell 3
01111 Revision: Denison 11.1
Page 29 of49
Ce1l4A Ce114B
i
Is LDS wet or -T:wet ~wet ~wet ~wet ~wet
dry? dry .dry -dry dry dry
If wet, Record ~ Ftto -Ftto .-Ftto 9·:1 Ftto ~.~9 Ft to
liquid level: Liquid Liquid Liquid Liquid * Liquid *
If sufficient Volume Volume Volume Volume Volume
fluid is
,.. ..... -;?.b'1t..t£.:.o jWrl..fr
present, record Flow_ Flow Flow Flow Flow
volume of Rate Rate .-Rate -Rate -Rate -
fluid pumped
and flow rate: / L_
Was fluid __ yes-Lno __ yes vno __ yes~no __ yes-Lno -yes / no
sample
collected?
Observation:
New Decon Pad) New Decon Pad. New Decon Pad
Portall Portal 2 Portal 3
/
Is LDS (portal) __ wet~dry __ wet i/dry __ wet vdry
wet or dry?
If wet, Record -Ftto -Ftto -Ftto
liquid level: Liquid Ltquid Liquid
If wet, Report to
RSO
4. Tailings Area Inspection (Note dispersal of blowing tailings):
~a~,t, ;y~,Z!~'1~~A~t:::k!flr;~:t.,-::Yi}::Ck /'4" haa
• .!vi .. .! 1:. rt"!
v..J~+h v,:,\l\tcr neo.~ rI'o. ~~ tR~l.<~ h~~ h~~ tJl\ t~~ ptJt'tt.U ~ U-\:/f t~f\t;",~ +0 fV'6f'I:fM" AflA.. SL"~ o.IT ""k'\\r~-hj\\.' b 'r) ~.
5. CpntroI ~lethods Implemented: .M tLi Ate"ar(c-ha. ~ be<a OIA.~" a +fl ,'(5 +'-'C/tl ,
'70 Clnd,.,. v..f> )..C"6I"0 l ... .-fl~ ~ ,
C:\Documellts and Settings\dturk.DMaLocal Settings\Temporary Internet Files\Content.Outlook\VM3Y6S1l\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!l.1
Page 30 of 49
7. COO~~~WU~~~:~1~"A~~k~S~8~o~o_J~~ ________________ _
* 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)? ~ 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\dturkDMC\Local Settings\Temporary Internet Files\Content.Outlook\VM3Y6SlI\Tailings Mgnt System and DMT
Mon Plan Nov 2010 Rv 11 1" Redline.doc
'7' <r':()-"~<
• I •. , '" " ,,~J, \
White Mesa Mill-Standard Operating Procedures
Book 11: Environmental Protection Manual, Section 3.1
01111 Revision: Denison 11.1
Page 28 of49
Date: 10 I~ /J.o 11
•
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 ((a)-(b)) _---.!..l:!>.-.;.J. t,~L.,---_
Ce1l4A: (a)Pond Solution Elevation t.J;g.s , qg
(b)FIvIL Bottom Elevation ___ ,5555.14_
(c)Deptb of Water above FML ((a)-(b)) 3() . .K'1
Ce1l4B: (a)Pond Solution Elevation ;>571~1
Roberts
(b)FIvIL Bottom Elevation 5557.50
{c)Depth of Water above FML «a)-(b» 2\-11
(d)Elevation of Beach Area with Highest Elevation
(monthly)
Pond: (a)Pond Solution Elevation
(b)FML Bottom Elevation
(c)Depth of Water above FNIL (a)-(b» _____ _
2. Slimes Drain Liquid Levels Cell 2 Pump functioning properly '-l e.~
__ -..:3=5::....:.~8...:..~ __ .Depth to Liquid pre-pump
___ 3~'E..:.~05~ ___ Depth to Liquid Post-pump
(all measurements are depth-in-pipe)
37 .. '17 Pre-pump head is .' -Depth to Liquid Pre-pump =
-~.og '11 '17
Post-pump head is tr :"'Vepth to Liquid Post ..
pump = __ L.tt~ .
C:\Documents and Settings\dturk.DMC\Local Settings\Temporary Internet Files\Content.Olltlook\VM3Y6S1I\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
3. Leak Detection Systems
Observation:
Cell 1 Cell 2
IsLDS wet or wet wet
dry? ~dry ~.dry
If wet, Record -Ftto -Ftto
liquid level: Liquid Liquid
If sufficient Volume Volume '
fluid is --
present, record Flow Flow
volume of Rate "" Rate .,
fluid pumped
and flow rate:
Was fluid __ yes~no __ yes-Lno
sample
collected?
Observation:
Cell 3
wet
-:7dry -Ft to
Liquid
Volume -
Flow
Rate .-
__ yes ../ no
01111 Revision: Denisonll.1
Page 29 of49
Ce1l4A Ce1l4B
~wet ~wet
dry d!y
:1.:1 Ftto l·~ Ptto
Liquid * Liquid *
Volume Volume
2.&1.1'1(0 ~bOih4
Flow Flow
Rate -Rate -
__ yes vno __ yes / no
New Decon Pad2 New Decon Pad! New Decon Pad
Portal 1 Portal 2 Porta13
/
Is LDS (portal) __ wet Vdry __ wet Vdry __ wet ---dry
wet or dry?
If wet~ Record Ftto Ft to Ftto
liquid level: Liquid Liquid Liquid
If wet, Report to
RSO
5. Control Methods hnplemented: ~1:1"\~~ -4;L ¥:UMQ Ieltllt ov:t bl",} fue4 w.'t'h;1\ ~L.f Ht:H.;.r~.
u.t~!~t::s CeiL*> iku.t''J \Or &o1s w,th tbe 1..6't&tr t R~ b""d-JCijJ Q~.f
) 6.
~t..1"'"
C:\Documents and Settings\dturk.DMaLocaI Settings\Temporary Internet Files\Content.Outlook\VM3Y6S lI\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 30 of49
7. Contaminated Waste Dump: _____ .;...L_oo_~_~ __ fs ..... ;)_{)_ct ___________ _
* Does Level exceed 12 inches above the lowest point on the bottom flexible membrane liner (solution
elevation of 5556.14 alnsl for Ce1l4A and 5558.50 for CeI14B)? V no __ yes
If Ce114A 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\drurk.DMC\Local Settings\Temporary Internet Files\Content.Outlook\VM3Y6SlI\Tailings Mgnt System and DMT
Mon Plan Nov 2010 Rv 11 I -Redline.doc
White Mesa Mill -Standard Operating Procedures
Book 11: Environmental Protection Manua1~ Section 3.1
01111 Revision: Denisonl L 1
Page 28 of49
Date: \ O/~ )/201(
1. Pond and Beach
elevations (msI, ft)
APPENDIX A (CONT)
DENISON MINES (USA) CORP.
WEEKLY TAILINGS INSPECTION
Inspectors: 6[1." rt; II'\. ell'll! f.C ) L III .... r Ii C' U;hi
Cell 1: (a) Pond Solution Elevation .56 \O~ 7'-'
(b) FIvIL Bottom Elevation 5597
(c) Depth of Water above FML «a)-(b ))-===~lf-ll31011:!..L. 7::9-=-~
Ce1l4A: (a)Pond Solution Elevation .55 8S! K9
(b)FMLBottom Elevation 5555.14 r
(c )Depth of Water above F1v1L «a)-(b») ____ 30=.....!!~~Jc~2~
CeIl4B: (a)Pond Solution Elevation .557'1. tl
(b)FML Bottom Elevation 5557.50
(c )Depth of Water above Frv1L « a)-(b») 21 ; 6 i
(d)Elevation of Beach Area with Highest Elevation
(monthly) ~
Roberts
Pond: (a)Pond Solution Elevation £"610" '1 ~
(b)FML Bottom Elevation ~:112;)~
(c)Depth of Water above F:rvIL «a)-(b» __ ~l£,-, . .".I:....-L._ ~~!O&--_
2. Slimes Drain Liquid Levels Cell 2 Pump functioning properly
_~2",-7..!....:J~I:..:5~_Depth to Liquid pre-pump
__ !?....,r:;..II-..II.:......':i--a.x;O __ Depth to Liquid Post-pump
(aliineasurements are depth-in-pipe)
37 .. Q7
Pre-pu!pp head is. -Depth to Liquid Pre-pump:::
ID-~ '314Q7
Post-pumn "ea~ i~ .. -Depth to Liquid Post-
pump = _ 6 '51-!
C:\Documents and Settings\dturk.DMC\Loca1 Settings\Temporary Internet Files\ContentOutlook\ VM3Y6S l1\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? -LLdry lLClrv
If wet, Record ~. Ftto -Ftto
liquid level: Liquid Liquid
If sufficient Volume Volume
fluid is ----present, record Flow Flow
volume of Rate -Rate -
fluid pumped
and flow rate: /
Was fluid __ yes--bL"no __ yes J:L:.no
sample
collected?
Observation:
Cell 3
wet
~dry
--Ftto
Liquid
Volume -
Flow
Rate --
/'
__ yes~o
01111 Revision: Denison 11.1
Page 29 of49
Ce1l4A Ce1l4B
~wet ~wet
dry drr
q~O Ftto ,?-,'I7Ft to
Ltquid * Liquid *
Volume {, _ 26Yt.-I ~O Volume 6
36C?76
Flow Flow ___
Rate --Rate
__ yes~o __ yes~no
New Decon Pad2 New Decon Pad1 New Decon Pad
Portal 1 Portal 2 Portal 3
Is LDS (portal) __ wet~ry __ wet~dry __ wet \.../(fry
wet or dry?
If wet, Record --Ftto .-Ftto ---Ftto
liquid level: Liquid Liquid Liquid
If wet, Report to
RSO
6.
C:\Documents and Settings\dturk.DMOLocal Settings\Tempormy Internet Files\Content.Outlook\VM3Y6Sll\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
7. Contaminated Waste Dump: L DOk-606c\
01111-Revision: Denison 11.1
Page 30 of 49
* Does Level exceed 12 inches above the lowest point on the bottom flexible membrane liner (solution
elevation of 5556.14 ams! 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 amsl), notify supervisor or Mill manager immediately.
C:\Documents and Settings\dturk.DMaLocal Settings\Temporary Internet Files\Content.OutlookWM3Y6Sll\Tailings Mgnt System and DMT
Mon Plan Nov 2010 Rv 11 I -Redline.doc
.., J ~r
t. White Mesa Mill-Standard Operating Procedures
Book 11: Environmental Protection Manual~ Section 3.1
01111 Revision: Denison 11.1
. Page 28 of 49
1. Pond and Beach
elevations (msl, ft)
APPENDIX A (CONT)
DENISON MINES (USA) CORP.
WEEKLY TAaINGS INSPECTION
CellI: (a) Pond Solution Elevation
(b) FML Bottom Elevation __ ,5597 __ _
(c) Depth of Water above FML «a)-(b) _--L:J·3:::;...;....Lq-f.~ __
Ce114A: (a)Pond Solution Elevation S.'S g S.bc>
(b)FML Bottom Elevation __ 5,555.14_
(c)Depth of Water above F1v1L «a)-(b») 3Q .--t ~
Ce1l4B: (a)Pond Solution Elevation
Roberts
(b)FML Bottom Elevation 5557.50
(c)Deptb of Water above FML «a)-(b)) 2}·51
(d)Elevation of Beach Area with Highest Elevation
(monthly)
Pond: (a)Pond Solution Elevation ;,b20 ~:2..
(b)FML Bottom Elevation _71,5612 . .3_
(c)Depth of Water above FML «a)-(b») _ . n -3?
2. Slimes Drain Liquid Levels Cell 2 Pump functioning properly _21 ..... , ...... , __
_~~~--:..I=&~_.~t5~. ,~~---"'Depth to Liquid pre-pump
_....:3:=.:.1:::::::· ~ij..l:Q~ __ Depth to Liquid Post-pump
(all measurements are depth-in-pipe)
_ . 37 :L( 7
Pre~pump head is .' -Depth to Liquid Pre-pump =
-'t.~ '3/ ,,'11
Post-pump head is S' -Depth to Liquid Post-
pump = _ 5 ~S1-'
C:\Documents and Settings\dturk.DMC\Local Settings\Temporary Internet Files\Content.Outlook\VM3Y6S1l\Tailings Mgnt System and DM!
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? ,,/ dry -dry
Cell 3
__ wet
"',/dry
r "l.,_ .;, ~
01111 Revision: Dellisonl1.1
Page 29 of49
Cell4A Ce1l4B
~
17 wet ~wet
dry dry
If wet, Record ---Ftto .,. Pt to Ptto !i .~ Ftto ~-~I Ftto
liquid level: Liquid Liquid Liquid Liquid * Liquid *
If sufficient Volume Volume Volume Volume Volume
fluid is -"" --~b'l~.lO 3bD7[(4
present, record Flow Flow Flow Flow Flow -~ volume of Rate Rate Rate ... Rate ,.,. Rate -
fluid pumped
and flow rate: I
Was fluid __ yes~no _~yes~no __ yes ;,/no __ yes~no __ yes~no
sample
collected?
Observation:
New Decon Pada New Decon Pad New Decon Pad
Portall Porta12 Portal 3
/
Is LDS (portal) __ wet~dry __ wet ./dry __ wet~dry
wet or dry?
If wet, Record ~ Ft to -'" Ftto -Ftto
liquid level: Liquid Liquid Liquid
If wet, Report to
RSO
4. Tailings Area Inspection (Note dispersal of blowing tailings);
RcMch wu-c ... H11, C·h\.J{j 1b.-~ \H~K ,lu.4', tt A \.#1, f"a. .~(). S j:(\1(,s p :2. GrF:r [."-J b~u\ h.pping
e\)t ... ~a"<1' w;~h ~h~ ,leer !l'kt$Q("\ U)? ),,(t~o:.. h~J. .$0""'41:. Jo/'?(1'" Af) 1J,-t... <cnk-ol(tJ G\r~U\ .Q:"cc:.
C:\D~uments and Settings\dturk.DMaLoca1 Settings\Temporary Internet FUes\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: Denison! 1.1
Page 30 of 49
7. Contaminated Waste Dump:_..:::l~o:...=o_I;<.:.:::.s.:=.--::::G-:;...;o;::..o_c\ _______________ _
* 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 SetUngs\dturk.DMC\Local Settings\Temporary Internet Files\Content.Outlook\VM3Y6S1l\Tailings Mgnt System and DMT
Mon Plan Nov 2010 Rv 11 I -Redline.doc
. . .i t: '"
White Mesa Mill -Standard Operating Procedures
Book 11: Environmental Protection Manua11 Section 3.1
01111 Revision: Denisonll.l
Page 28 of49
Date: HI Y 12011
1. Pond and Beach
elevations (msI, ft)
APPENDIX A (CONT) .
DENISON MINES (USA) CORP.
WEEKLY TAILINGS INSPECTION
CellI: (a) Pond Solution Elevation 3~Jl.oy
\
(b) F1v1L Bottom Elevation _-'r.'(~.5597
(c) Depth of Water above F1vIL «a)-(b)) [lj.Di
Ce1l4A: (a)Pond Solution Elevation !)S ~5.~~
(b)FML Bottom Elevation __ 5555.14_
(c)Depth of Water above Rv.IL «a}·(b)) 3D.01
CeIl4B: (a)Pond Solution Elevation ~ S 7g.gj
Roberts
(b)FML Bottom Elevation 5557.50
(c) Depth of Water aboveEML «a)-(b» ~I. 3'\
(d)Elevation of Beach Area with Highest Elevation
(monthly)
Pond: (a)Pond Solution Elevation ..5 , I 'f. 2D
(b)FMLBottomElevation _~5612.3_
(c)Depth of Water above FML «a)-(b») _~b",-.-,j __ _
2. Slimes Drain Liquid Levels Cell 2 Pump functioning properly :Ie ~
_~::::w......J4l.!.,.' 3~1 :---__ .Depth to Liquid pre-pump
_3_5.J-·_~_9-+-__ .Depth to Liquid Post-pump
(all measurements are depth-in~pipe)
37~q1
Pre-pump head is .'.Depth to Liquid Pre-pump =
_.3w'6 37.1f7 Post-pump head is .,. -Depth to Liquid Post-
pump=_ ~ .. 69
C:\Documents and Settings\dturk.DMC\Local Settings\Temporary Internet Flles\ContentOutlook\VM3Y6S1l\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
01 III Revision: Denison 11 .1
Page 29 of49
3. Leak Detection Systems
Observation:
Celli Cell 2 Cell 3 Ce1l4A Ce1l4B
/"'
IsLDS wet or _~wet __ wet wet ~wet ~wet
dry? Jdry ..,,/ dry /dry dry dlY
If wet, Record -Ftto -Ftto 0-Ft to ~·3 Ftto l·D2,. Ftto
liquid level: Liquid Liquid Liquid Liquid * Liquid *
If sufficient Volume Volume ' Volume Volume Volume
fluid is -.-. ~GLfy,b ~bDql~ -
present, record Flow Flow Flow Flow Flow
volume of Rate , Rate -Rate -Rate -Rate -
fluid pumped
and flow rate: ...
Was fluid __ yes~no __ .yes~no __ yes-Lno __ yes v' no __ yes~no
sample
collected?
Observation:
New Decon Pad! New Decon Padl New Decon Pad
Portall Portal 2 Portal 3
Is LDS (portal) __ wet ../ dry __ wet ./ dry __ wet ,../ dry
wet or dry?
If wett Record Ftto Ftto Ftto
liquid level: Liquid Liquid Liquid
If wet, Report to
RSO
4. Tailings Area Inspection (Note dispersal of blowing tailings):
~ __ r~1~r~~'~~=4~~~:=r~~~~n~~'~~'~'~~~~~1~~~~~~~~~~~~~~~;n{
\ -~
5. Control Methods Implemented;...,t.:.L~=~--'-~~~04-..:~~'-+";::';--:-'-'-"~~~"""""'--__ _
-(k~
6. Remarks: NC\t;) \ApcL·,.t~ck s6!1J.){.rc \",,>u.s ;f'l.sf"lIed On (ell YCS L1\5..
$rL-lt:-h ....... ,oc.k. VY"'i> {JO s;:fc. Sy..t\)~.ti::s I'.)oril.. s:1<-p;:pptf'.tJ L;"c
Rcpl~~ (10.. Lov-rk rJ;' »ad LlOt/"lF If' l.M~;"~ plA.I"')P~ lOod~.
C:\Documents and Settings\dturk.DMC\LQcal Settings\Temporary Internet Files\Content.OutlookWM3¥6SlI\Tailings Mgnt System and DMT
MOll Plan Nov 2010 Rv 1 I 1-Redline.doc
White Mesa Mill -Standard Operating Procedures
Book 11: Environmental Protection Manual, Section 3.1
01111 Revision: Denison!l.1
Page 30 of49
7. Contaminated W aste Dump:.--=L~g~Q/.,;..;~~s~rri;;;.l.o~b.l.4A_]~ _______________ _
* 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)? ~ no __ yes
IT 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.DMCu...ocal Settings\Temporary Internet Piles\Content.Outlook\VM3Y6Sll\Tailings Mgnt System and DMT
Mon Plan Nov 2010 Rv 11 1 - Redline.doc
White Mesa Mill-Standard Operating Procedures 01/11 Revision: Denison11.1
Page 28 of49 Book 11: Environmental Protection Manual, Section 3.1
1. Pond and Beach
elevations (msl, ft)
APPENDIX A (CONT)
DENISON MINES (USA) CORP.
WEEKLY TAILINGS INSPECTION
Cell 1: (a) Pond Solution Elevation Sb ll.30
(b) FN.£L Bottom Elevation 5597
(c) Depth of Water above FNIL «a)-(b» _J....! 'i1-Aoo:),..1-----
CeIl4A: (a)Pond Solution Elevation .5.58 • ?i7
(b)FML Bottom Elevation 5555.14_
(c)Depth of Water above FML ((a)~(b)) _ 30.23,
Ce1l4B: (a)Pond Solution Elevation 551'1 tOO _ .
Roberts
(b)FML Bottom Elevation 5557.50
(c)Depth of Water above EML «a)-(b) ~ 2=,1.::'0
(d)Elevation of Beach Area with Highest Elevation
(monthly)
Pond: (a)Pond Solution Elevation !>('2.J .. '6
(b)FML Bottom Elevation ___ 5612.3_
(c)Deptb of Water above FML «a)-(b» --qL&..,3-.c~~4 __ -
2. Slimes Drain Liquid Levels Cell 2 Pump functioning properly 'j,,~
~J _Depth to Liquid pre-pump
3~ ·1;1==---_Depth to Liquid Post-pump
(all measurements are depth-in-pipe)
'37i~1
Pre-pump head is la' -Depth to Liquid Pre-pump =
_ 2 .. Q.8 37 .. ct1
Post-pump head is .' -Depth to Liquid Post-
pump=_:2 .. 0S
C:\Docuroents and Settings\dturk.DMC\Local Settings\Temporary Internet Files\Content.Outlook\VM3Y6Sll\Tailiogs Mgnt System and DMT
Man Plan Nov 2010 Rv 11 1 -Redline.doc
,-. ~~ ... ~,
I~ vJ ... -',..'
White Mesa MilI -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 'H 7~dry dry? ~dry
Cell 3
wet --./'dry
01111 Revision: Denison 11.1
Page 29 of49
Ce1l4A Ce1l4B
J wet ~wet
.dry dry
If wet, Record -Ftto -Ftto .. ' Ftto ~~J Ft to a ,~ Ftto
liquid level: Liquid Liquid Liquid Liquid * Liquid *
If sufficient Volume Volume Volume Volume Volume
fluid is ... ,.; ... ~LI"t'() '3'0,':11
present, record Flow Flow Flow Flow Flow
volUllle of Rate ., Rate -Rate -Rate Rate ..... ~
fluid pumped
and flow rate: L .
Was fluid __ yes~no _~yes-Lno __ yes~no __ yes __ no __ yes~no
sample
collected?
Observation:
New Decon Pads New Decon Pad2 New Decon Pad
Portall Portal 2 Portal 3
Is LDS (portal) __ wet Ldry __ wet~dry __ wet /dry
wet or!IrY?
If wet, Record ~ Ftto .... Ftto ,.. Ftto
liquid level: Liquid Liquid Liquid
If wet, Report to
RSO
C:\Documents and Settings\dturk.DMC\Local Settings\Temporary Internet Files\Content.OutlookWM3Y6S11\Tailings Mgnt System and DMT
Moo Plan Nov 2010 Rv 11 I -Redline.doc
White Mesa Mill -Standard Operating Procedures
Book 11: Environmental Protection Manual, Section 3.1
01111 Revision: Denisonll.i
Page 30 of 49
7. Contaminated Waste Dump:_-=L~09~kr.3l$oL-~(,...w:.o.=l",--________________ _
* Does Level exceed 12 inches above the lowest point on the bottom flexible membrane liner (solution
elevation of 5556.14 ams! for Ce1l4A and 5558.50 for CeIl4B)? ~ no __ yes
If Cell 4A leak detection system level exceeds 12 inches above the lowest point on the bottom flexible
membrane liner (elevation 5556.14 runsl), notify supervisor or Mill manager immediately.
C:\Documents and Settings\dturk.DMC\Loca! Settings\Temporary Internet Piles\Content.Outlook\vM3Y6SlI\Tailings Mgnt System and DMT
Mon Plan Nov 2010 Rv 11 1 -Redline.doc
White Mesa Mill-Standard Operating Procedures 01111 Revision: Denison 11.1
Page 28 of49 Book 11: Environmental Protection Manual, Section 3.1,
Date:~l t[i'lS/'J.lJll
1. Pond and Beach
elevations (msl, ft)
APPENDIX A (CONT)
DENISON MINES (USA) CORP.
WEEKLY TAILINGS INSPECTION
CellI: (a) Pond Solution Elevation
(b) flv.1L Bottom Elevation 5597 __ _
(c) Depth of Water above FML «(a)-(b))',· "Y.H$
Ce1l4A: (a)Pond Solution Elevation ~g.5,]Y,.
(b)FML Bottom Elevation 5555.14_
(c)Depth of Water above FML «a)-(b) .. , 3 0 . L ' .. '
Ce1l4B: (a)Pond Solution Elevation
Roberts
(b)FML Bottom Elevation 5557.50
(c)Depth of Water above FML «a)-(b)) .Q;..t.Y~
(d)Elevation of Beach Area with Highest Elevation
(monthly)
Pond: (a)Pond Solution Elevation Sbl9 .~b
(b)FMJ.., Bottom Elevation 5612.3_
(c )Depth of Water above FML «a)-(b)) :-:~.-",..,.. -...... t! ..... C,....... __
2. Slimes Drain Liquid Levels Cell 2 Pump functioning properly 'Y,e ,,:. _
_~ .... .3"",-'~'~-+ ...... 9"""'L,..,.......~ .. ~Depth to Liquid pre-pump
,~ .... :3du;,5~:, ;:..,'/l~~'_~Depth to Liquid Post-pump
(all measurements are depth£in~pipe)
37~q7 Pre-pump head is .' -Depth to Liquid Pre-pump =
3.,00 37,Q1
Post-pump head is 'W -Depth to Liquid Post-
pump= ~ .. OD
C:\Documents and Settings\dturk.DMC\Local Settings\Temporary Internet Files\Content.Outlook\VM3Y6Sll\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
IsLDS wet or ~wet wet
dry? J .dry_ -dry
Cell 3
. wet ~ -dry
01111 Revision: Denison11.1
Page 29 of49
Ce1l4A Ce1l4B
~wet ~wet
.dry dry
If wet, Record --Ftto .... Ftto ...... Ptto g,y Ftto .~t·bq Ftto
liquid level: Liquid L~uid Liquid Liquid * Liquid *
If sufficient Volume Volume Volnme Volume Volume
fluid is ~ .-. -a..t.~~'o 3bC~5:J
present, record Flow Flow Flow Flow Flow
volume of Rate -" Rate ~ Rate Rate .-.-'!" Rate -,r=::::
fluid pumped
and flow rate: /
Was fluid __ yes ./uo __ yes~no __ yes .Lno __ yes ../no __ yes Lno
sample
collected?
Observation:
New Decon Pad~ New Decon Pad~ New Decon Pad
Portal! Portal 2 Portal 3
/ /
Is LDS (Portal) __ wet t/ dry __ wet ../ dry __ wet ~dry
wet or dry?
If wet, Record ..,; Ftto -Ftto .......... Ftto
liquid level: Liquid Liquid Liquid
If wett RepOlt to
RSO
C;\Docllments and Settings\dturk.DMC\LocaI Settings\Temporary Internet Files\Content.OutIook\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: Denisonll.1
Page 30 of49
7. Contaminated Waste Dump: __ L_06_k5 __ G--oo-tl _______________ _
* 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)? I./" 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\Ternporary Internet Files\Content.OutlookWM3Y6SlI\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
01111 Revision: Denisonl1.1
Page 28 of49
1. Pond and Beach
elevations (ms!, ft)
APPENDIX A (CO NT)
DENISON MINES (USA) CORP.
WEEKLY TAILINGS INSPECTION
Cell!: (a) Pond Solution Elevation
(b) Fl\.1L Bottom Elevation __ 5597 __ _
(c) Depth afWater aboveFML «a)-(b)) --'-'y-S...;...i,·b"'-l7f----
Ce1l4A: (a)Pond Solution Elevation 5S;g"K:SiL~_-
(b)FML Bottom Elevation __ 5555.14_
(c)Deptb atWater above FML «a)-(b») -...::; . .3I'-L·I """",J~~~~-
Ce1l4B: (a)Pond Solution Elevation s:s.78'.9t
Roberts
(b)FN£L Bottom Elevation 5557.50
(c)Depth of Water above FIvIL «a)-(b» --=;2.~Iw..''1...u'"--__
(d)Blevation of Beach Area with Highest Elevation
(monthly)
Pond: (a)Pond Solution Elevation _ ,.1;:1J9.&5
(b)FML-Bottom Elevation _~_5612.3_
(c) Depth of Water above FML «a)-(b») ~.......:'1~' ',. ;:....;.1J.3;j5E==._~_
2. Slimes Drain Liquid Levels Cell 2 Pump functioning properly ~_
~\ ,...(:.~ '¢ .Q.... &F! -rr irp~!
~t~<J ~F.t
...:~;..;:J..L..:O.... .. li,,;,,~=~:-,-__ -",Depth to Liquid pre~pump
~ .. .....,,/!_Z~!>;.,,;..·'l-+:,+-f -----.,~_Depth to Liquid Post-pump
(all measurements are depth-in~pipe)
31.'17
Pre-pump head is .' ~ Depth to Liquid Pre-pump =
-10.oLl .1 7~q 7
Post-pump h~ad is.' -Depth to Liquid Post-
pump=_ .7,-06
C:\Documents and Settings\dturk.DMC\Local Settings\Temporary IntemetFIles\Content.OutIook\VM3Y6S1l\Tailings Mgnt System and DMf
Mon Plan Nov 2010 Rv 11 1 -Redlioe.doc
White MeSa MiII -Standard Operating Procedures
Book 11: Environmental Protection Manual, Section 3.1
01111 Revision: Denison 11.1
Page 29 of49
3. Leak Detection Systems
Observation:
Is LDS wet or
dry?
If wet, Record
liquid level:
If sufficient
fluid is
present, record
volume of
fluid pumped
and flow rate:
CellI
.... Ftto
Liquid
Volume
Flow
Rate_-__
Cell 2
..... Ftto
Liquid
Volume '
Flow
Rate --
Cell 3
_.....;.-___ Ft to
Liquid
Volume
Flow
Rate -
Ce1l4A
'1 ,1 Ft to
Liquid *
Volume
p.~"'\!:H·D
Flow
Rate._ .... __
Ce1l4B
~1 Ftto
Liquid *
Volume
~'b'iS~
Flow
Rate'--~ __
Was fluid
sample
collected?
__ yes __ no __ yes / no __ yes L no __ yes~ no __ yes .Lno
Observation:
New Decon Pad! New Decon Pad2 New Decon Pad
Portall Portal 2 Porta13
L
Is LDS (portal) __ wet~dry __ wet ~dry __ wetLdry
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!t'y ill · tiDS t;ic.tcitl ".'it ~jj,!i{'·::JP;~.gp~· _ \+<.JQ.. s.Q ,~d;r:i~ hA~ +~h .~i~ 6'" .~,:fc!.. fo Gv" ..
~....ry.,uJ .,,;,'i\ 4""+-p~~_Y....;.,J..1 . ~\~"'~~ ::J.. Go-Ft Uf'et.:o.".....} +. *~f*-"=-........,.~­
fledrll~,r(A1\b ~·'(c:A..BU\l~.s .,.},,.J-~MG. J'j ' 'Dt:cr ()e.C'.r ~l/~
C:\Documents and Settings\dturk.DMC\Loca1 Settillgs\Temponuy Internet Files\Content.Outlook\VM3Y6Sll\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: Denisonll.1
Page 30 of 49
7. Contaminated Waste Dump:_~t...;...o~_~.;...!>_~&~u;;.!o6/£;A~ _______________ _
* Does Level exceed 12 inches above the lowest point on the bottom flexible membrane liner (solution
elevation of 5556.14 runsl for Ce1l4A and 5558.50 for Ce1l4B)? ~ no __ 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\dturkDMaLocal Settings\Temporary Internet Files\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: Envirorunental Protection ManuaI,Section 3.1
01111 Revision: Denison 11.1
Page 28 of49
1. Pond and Beach
elevations (msl, ft)
APPENDIX A (CONT)
DENISON MINES (USA) CORP.
WEEKLY TAILINGS INSPECTION
.-f'" Inspectors: J '-f\!)~(' H.,Il,J",,-1 G-o..'(rlto P(),.l)11~r
61
Cell 1: (a) Pond Solution Elevation 5(,1( . ,"0
(b) FNIL Bottom Elevation ___ 5597 __ _
(c) Depth of Water above FML « a)-(b)) _......::1--:«:1;......;. b:L...-__
Cell4A: (a)Pond Solution Elevation 5S~7.o1
(b)FML Bottom Elevation ___ ,5555.14_
(c)Depth of Water above F.l\1L «a)-(b)) ~l ,q,)
Cell 4B: (a)Pond Solution Elevation 5Si~.~1
Roberts
(b)FML Bottom Elevation 5557.50
(c)Depth of Water above FML «a)-(b)) ,., /) ,
(d)Elevation of Beach Area with Highest Elevation
(monthly)
Pond: (a)Pond Solution Elevation bb tq. O~
(b)FML Bottom Elevation ___ 5612.3_
(c)Deptb of Water above FML «a)-(b») ~---J''''''':...J7t.....4.L.-.. __
2. Slimes Drain Liquid Levels Cell 2 Pump functioning properly "it! ~
--.~.-.."~. \_'=--_~_,Depth to Liquid pre-pump
___ ,!>~Oz;....,:,...'I+i~ __ --,Depth to Liquid Post-pump
(all measurements are depth-in-pipe)
37,'11
Pre-pump head is .' -Depth to Liquid Pre-pump =
_Ii.? 9_ 37. q-,
Post-pump head is .. -Depth to Liquid Post-
pump = 7.ao
C:\Documents and Settings\dtork.DMC\Loca1 Settings\Temporruy Internet FiIes\Content.OutloQk\VM3Y6SlI\Tailings Mgnt System and DMT
Mon Plan Nov 2010 Rv 11 1 -RecUine.doc
/--), ~ ~ ';'.,
" t""l''!''' ~
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 __ wet
dry? '{. illy ~.dry
Cell 3
__ wet
Y.dry
01111 Revision: Denison!l.1
Page 29 of49
Ce1l4A Ce1l4B
~wet --Lwet
.dry dry
If wet, Record -Ftto -Ftto -Ftto ~·5 Ftto ~.2..s Ftto
liquid level: Liquid Liquid Liquid Liquid * Liquid *
If sufficient Volume Volume -Volume Volume Volume
fluid is --A'-'i«iC.O '''01'-''1
present, record Flow Flow Flow Flow Flow
volume of Rate /' Rate -Rate -Rate Rate ... -
fluid pumped
and flow rate:
Was fluid __ yes~no __ yes-..lS,...no __ yeS-Lno __ yes--X...no __ yes~no
sample
collected?
Observation:
New Decon Pad~ New Decon Padl New Decon Pad
Portall Portal 2 Portal 3
Is LDS (portal) __ wet~dry __ wet--..:t.,dry __ wet-Ldry
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):
g.,J". I:I,,*,. b ... 0 bJ..,JcA ':"'11 ;I, .s u"'~~ (;. F:f >1;11 ~~ ifr'"\] "e"" I) I. Q#, .:i ';11 "",..
"~ 6.
" "",.-ll.t:;L....~~~~~~~c.mD11~t!lat:U1:~~~~~~Xl~L~:!!A~~~~n~
C;\Documents and Settings\dturk.DMC\Loca} Settings\Temporary Internet Files\Content.Outlook\VM3Y6Sll\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: Denison1!.1
Page 30 of49
7. Contaminated Waste Dump: ___ L-_oo_l<s __ Cr_ooa __ . ____________ _
* Does Level exceed 12 inches above the lowest point on the bottom flexible membrane liner (solution
elevation of 5556.14 runsl for Ce1l4A 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\dturkDMC\Local Settings\Temporary Internet Files\Content.OutIoo1c\vM3Y6SlI\Tailings Mgnt System and DMT
Mon Plan Nov 2010 Rv 11 1 ~ RedUne.doc
., ·r White Mesa Mill-Standard Operating Procedures
Book 11: Environmental Protection Manual, Section 3.1
01111 Revision: Denison 11.1
Page 28 of49
Date: 1 'J-.. or· Q4 I(
1. Pond and Beach
elevations (msI, ft)
APPENDIX A (CO NT)
DENISON MINES (USA) CORP.
WEEKLY TAILINGS INSPECTION
CellI: (a) Pond Solution Elevation .561\.S1
(b) FML Bottom Elevation __ .5597 __ _
(c) Depth of Water above FML «a)-(b») _--J.'Lf~eS--.....1 __
Cell 4A: (a)Pond Solution Elevation .s.5g 7 ~ 7'7
(b)FML Bottom Elevation ___ ,5555.14_
(c)Depth of Water above FI\1L «a)-(b)) :12.63
Ce1l4B: (a)Pond Solution Elevation fli7 8,,76
(b)F.ML Bottom Elevation 5557.50
(c )Depth of Water above FML «a)-(b)) gt I" "}-,
(d)Elevation of Beach Area with Highest Elevation
(monthly) ;v'lt
Roberts
Pond: (a)Pond Solution Elevation Sl".'>
(b)FM:L Bottom Elevation __ ~5612.3_
(c)Depth of Water above FML «a)-(b)) __ 7.~.~6.,-S~-
2. Slimes Drain Liquid Levels Cell 2 Pump functioning properly
---'3-==--=:s'--".:.....:~~f ___ Depth to Liquid pre-pump
_.-!1 ..... b""""-'O~'fJ-.--_.Depth to Liquid Post-pump
(all measurements are depth-in~pipe)
37#q7
Pre-pump head is ~ -Depth to Liquid Pre-pump =
, l.~7 & ~7f#q 7
Post-pump head is 9i8' -Depth to Liquid Post-
pump = I ~ SiJ
C:\Documents and Settings\dturk.DMC\LocaJ Settings\Temporary Internet Files\Content.Outlook\VM3Y6S1I\Tailings Mgnt System and DMT
Mon Plan Nov 2010 Rv 11 1 -Redline.doc
%~.~.-~ .~ » \Vhite Mesa MiII -Standard Operating Procedures
Book 11: Environmental Protection Manual, Section 3.1
3. Leak Detection Systems
Observation:
CellI Cell 2
IsLDS wet or __ wet wet
dry? LLeI!'y ~dry
Cell 3
wet --~ry
01111 Revision: Denisolll1.1
Page 29 of49
Ce1l4A Cell4B
~wet --..J.L:wet
.<kY -dry
If wet) Record -Ftto --Ftto --Ftto ~.g Ftto 2..:!a6 Ft to
liquid level: Liquid Ltquid Liquid Liguid >I: Liquid *
If sufficient Volume Volume ' Volume Volume 6 Volume
fluid is --------Z-61.fLl 0 r::t
present, record Flow Flow Flow Flow Flow
-----volume of Rate -Rate -Rate -Rate -'" Rate
fluid pumped
and flow rate: .,
Was fluid __ yes~no __ yes..J.L'llo __ yes~l1o __ yes---tL:no __ yes.-£.no
sample
collected?
Observation:
New Decon Padl New Decon Pad~ New Decon Pad
. , Portall Portal 2 Portal 3
-...-
Is LDS (Portal) __ wet--J.L'dry __ wet ~dry __ wet~y
wet or dry?
If wet, Record .,.".. Ftto ---Ptto -Ftto
liquid level: Liquid Liquid Liquid
If wet, Report to
RSO
4.
C:\Documents and Settings\dturk.DMC\Local Settings\Temporary IntemetFiles\Content.OutIook\VM3Y6Sll\Tailings MgntSystem and DMT
Mon Plan Nov 2010 Rv 11 1 -RedJine.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&,aq~:...,t:..-=--,.sL---..... (;_;t;)~'a...,..-.J,""",.",-----_______ _
* Does Level exceed 12 inches above the lowest point on the bottom flexible membrane liner (solution
elevation of 5556.14 runsl for Ce1l4A and 5558.50 for CeIl4B)? 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\L()cal Settings\Temporary Internet Files\Content.Outlook\VM3Y6SlI\Tailings Mgnt System and DMT
Mon Plan Nov 2010 Rv 11 1 ~ Redline.doc
, i
White Mesa Mill-Standard Operating Procedures
Book 11: Environmental Protection Manual, Section 3.1
01111 Revision: Denison 11.l
Page 28 of49
1. Poud and Beach
~ elevations (msl, ft)
APPENDIX A (CONT)
DENISON MINES (USA) CORP.
WEEKLY TAILINGS INSPECTION
CeD 1: (a) Pond Solution Elevation SkU ,."
(b) F1v.IL Bottom Elevation __ 5597 __ _
(c) Depth of Water above FML «a)-(b)) ______ J4'i~' ...... '~-
Ce114A: (a)Pond Solution Elevation ..5588.13 _
(b)FMLBottom Elevation ___ ,5555.14_
(c)Depth of Water above FML «a)-(b)) 32.."
Ce1l4B: (a)Pond Solution Elevation -,-,S5I~i~
Roberts
(b )FML Bottom Elevation 5557.50
(c)Depth of Water above F1vIL «a)-(b)) ~i.:;LS , .~~_
(d)Elevation of Beach Area with Highest Elevation
(monthly)
Pond: (a)Pond Solution Elevation .s'r.I~·'l
(b)FML Bottom Elevation __ 5612.3_
(c) Depth ofWateraboveFML «a)-(b)) ~"""""""":!::..,:l.~~13~' __
2. Slimes Drain Liquid Levels Cell 2 Pump functioning properly 'Xc:"
..... /4 Depth to Liquid pre-pump
. Ja Depth to Liquid Post-pump
(all ~e~~~~e~~ ~ d~~ili~in:~i~e; .....
PreHpump head is.lJ-])~pZ to Liquid Pre-pump =
-_.-37·q7 .
,Post-;pump head is .. -Depth to Liquid Post-
pump = --=_~_
C~\Oocuments and Settings\dturk.DMC\Loc{u Settiri'gs\Temp6i~ l:nternet'FiIes\Co~tent.o~tloOk\VM3y6S1nTaili~gS 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
3. Leak Detection Systems
Observation:
CellI Cell 2
", , ~ J' ,. "
Cell 3
01111 Revision: Denisonl1.1
Page 29 of49
Cell 4A ,. ,~.: Ce114B
Is LDS wet or __ wet wet wet ~wet ~wet
<Jry? -./_dry ';-dry "" dry -dry dry
If wet, Record .... Ftto .... Ftto Ftto 13.4 Ftto .:t~'1! Ftto
liquid level: Liquid Liquid Liquid Liquid * Liquid *
If ,sufficient Volume Volume Volume Volume Volume
fluid is -... .... ;U"'l"fU) ----~ presen~, .record Flow Flow Flow Flow Flow -volume of Rate Rate .... Rate ..... Rate -Rate ...
fluid ,:pu~ped
anc!' flow rate:
W·~ fluid __ yes_~no __ yes J no __ yes ./ 110 __ yes F no __ yes~no
sample
collected?
Observation:
New Decon Pad~ New Decon Pad= New Decon Pad
~ -i P0l1all Portal 2 Portal 3
i
Is LDS (Portal) __ wet~dry __ wet~dry __ wet /dry
wet or dry?
If wet~ Record Ftto ... Ftto _. Ftto ~
liquid level: Liquid Liquid Liquid
If wet, Repo~ to
RSO
4. Tailings Area Inspection (Note dispersal of blowing tailings):
tflt ~b:ltll:+.t,.~ 'W.!~,~"¥l ~. ~ "'~.J.A' -'&W -,I!)Q .'_ . _', ... -.-' " ._---,
6. Re~arks:_Ati,~b"*i ft\ Q~_._lr\J kSM.pl~~~~" ~Vh ~,~, ~~~~~:n~~.J~ A!L .. .... .
C:\Documents and Settings\dturk.DMC\Locai Settings\Temporn:ty Internet 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 Manuat Section 3.1
. 01111 Revision: Denison 11.1
Page 30 of49
7. Contaminated Waste Dump:_-=L.:;.:: .. ;..::."'....:::...~c,.,..::.., .. .;...;~;.....;...-. ______________ _
* Does Level exceed 12 inches above the lowest point on the bottom flexible me~rane liner (solution
elevation of 5556.14 amsl for Ce1l 4A and 5558.50 for CeIl 4B)? __ no __ yes
If Ce1l 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\Local Settings\Temporary Internet FUes\ContentOut!Qok\VM3Y6SlI\Tailings Mgnt System and DMT
Mon Plan Nov 2010 Rv 11 1-Redline.doc
White Mesa Mill-Standard Operating Procedures
Book 11: Envirorunental Protection Manual, Section 3.1
01111 Revision: Denison 11.1
Page 28 of49
Date: 12 · Z ~ . caJ/
1. Pond and Beach
elevations (msl, ft)
APPENDIX A (CONT)
DENISON MINES (USA) CORP.
WEEKLY TAILINGS INSPECTION
Cell 1 : (a) Pond Solution Elevation St;,/I,C,I
(b) FML Bottom Elevation _~-:-.5597 __ _
(c) Depth of Water above FML «(a)-(b) _---=-I.....:t.1..:... ... 1..L6 ...... l--
Ce1l4A: (a)Pond Solution Elevation 5S~~v70
(b)F1vIL Bottom Elevation 5555.14_
(c )Depth of Water above FML «a)-(b») _ '3 '3 J ~6_
Ce1l4B: (a)Pond Solution Elevation
(b)~ Bottom Elevation 5557.50
(c)Depth of Water above FML «a)-(b)) .21.. 7</
(d)Elevation of Beach Area with Highest Elevation
(monthly) «.1
Roberts
Pond: (a)Pond Solution Elevation St, /1,. <6-s;-
(b)FM:L Bottom Elevation _~5612.3_
(c )Depth of Water above FIvfL «a)-(b» __ -1-7-=-...:;;;.5>...;;,..5_-
2. Slimes Drain Liquid Levels Cell 2 Pump functioning properly ~
__ :7---:5>:----_{ _O=--_Depth to Liquid pre-pump
_---=-..:J....;:6~-_O~?_'___,Depth to Liquid Post-pump
(all measureluents are depth-in-pipe)
37"Ql Pre-pu~ head is .' -lJepth to Liquid Pre-pump::;
_ktsi 37.q7
Post-pump head is .' -Depth to Liquid Post-
pump= J"qO
C:\Documents and Settings\dturk,DMC\Local Settings\Temporary Internet FIles\Content.Outlook\VM3Y6S lI\Tailings Mgllt 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:
Celll Cell 2
Is LDS wet or __ wet __ wet
dry? /dry l&rv
If wet, Record Ftto Ftto
liquid level: Liquid Liquid
If sufficient Volume Volume '
fluid is
present~ record Flow Flow
volume of Rate Rate
fluid pumped
and flow rate:
Was fluid __ yes-0lo ~_yes~no
sample
collected?
Observation:
01111 Revision: Denison!l.!
Page 29 of 49
Ce113 Ce1l4A Ce1l4B
__ wet ~wet ~et
~ry .dry ~dry
Ftto q~ -; Ftto Ftto
Liquid Liquid * Liquid *
Volume Volume Volume
Flow Flow Flow
Rate Rate Rate
2/f'lltJ .3tY
__ yes~lo __ yes-----±010 __ yes~no
New Decon Padl New Decon Pads New Decou Pad
POlta1! Portal 2 Portal 3
Is LDS (portal) __ wet_vdfy __ wet~dry __ wet ~
wet or dry?
If wet, Record Ft to Ftto Ftto
liquid level: Liquid Liquid Liquid
If wet, Report to
RSO
I 5. Control Mgth:ods hnplemented: ____________________ _
C:\Documents and Settings\dturk.DMC\Local Settings\Temporary Intemet Piles\Content.OutlookWM3Y6SlI\Tailings Mgnt System and DMT
Men Plan Nov 2010 Rv II 1-Redline.doc
White Mesa Mill -Standard Operating Procedures
Book 11: Environmental Protection Manual, Section 3.1
o 1/11 Revision: Denison1l.1
Page 30 of49
7. coo~~~~~~~ __ k_~_~ __ ~_~_A _____________ _
* Does Level exceed 12 inches above the lowest point on the bottom flexible membral1e liner (solution
elevation of 5556.14 amsl for Ce1l4A and 5558.50 for Ce1l4B)? -Lno __ 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\Local 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
01111 Revision: Denison 1 1.1
Page 28 of49
Date: J;L .. -SO" 2.rv~(
1. Pond and Beach
elevations (msl, ft)
APPENDIX A (CONT)
DENISON MINES (USA) CORP.
WEEKLY TAILINGS INSPECTION
fuspectors:
Cellt: (a) Pond Solution Elevation
(b) FNIL Bottom Elevation 5597~_
(c) Depth of Water above FN1L «a)-(b»)====..&-·'0-L-:&J,' 6~l_
Ce1l4A: (a)Pond Solution Elevation 5.5 act .0 I
(b)FML Bottom Elevation __ 5555.14_
(c )Depth of Water above fl...1L (a)-(b)) 3 "3 # g 7
Ce1l4B: (a)Pond Solution Elevation £S78. <lY
(b )FML Bottom Elevation 5557.50
(c)Depth of Water above FNIL «a)-(b) AI,. :1t..1
(d)Blevation of Beach Area with Highest Elevation
(monthly) N/\
Roberts
Pond: (a)Pond Solution Elevation 56 JJ S?..
(b)FML Bottom Elevation ___ .5612.3_
(c)Deptb of Water above FML «a)-(b») ___ qJ..,.:!; .. ~2~2:...-
2. Slimes Drain Liquid Levels Cell 2 Pump functioning properly __ ~ __
_-=.3;.....::5;....,.;.;....;::6:-...-3 __ .Depth to Liquid pre-pump
_...&.3 ...... 7~ ....... 1_3o.-_D.epth to Liquid Post-pump
(all measurements are depth-in-pipe)
37~qi
Pre-pump head is ~' -Uepth to Liquid Pre~pump =
~3L.( 31.q1
Post-pump head is.g.g' -Depth to Liquid Post-
pump = __ O~ 8Lf
C;\Documents and Settings\dturk.DMC\Local Settings\Temporary Internet Files\Content. Outlook\ VM3Y6S 1 l\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? 2dry -.lL~
Cell 3
__ wet
--LLdry
01111 Revision: Denison 11.1
Page 29 of49
Cell4A Ce1l4B
~et ~wet
~dry dry
If wet, Record ....---Ftto ---Ftto ---Ftto II.. tt Ft to 2.6:;; Ftto
liquid level: Liquid Liquid Liquid Liquid * Liquid *
If sufficient Volume Volume ' Volume v~e V~r fluid is ----_,%£1t.f6C
present, record Flow Flow ~ Flow Flow Flow ------volume of Rate Rate Rate -Rate Rate
fluid pumped
and flow rate: ,/ ./
Was fluid __ yes~no __ yes-LL."fio __ yes~ho _~yes-L..no __ yes __ llo
sample
collected?
Observation:
New Decon Padl New Decon Pad2 New Decon Pad
Portall Portal 2 Portal 3
Is LDS (Portal) __ wet c,...---dry ~_wet~dry __ wet~dry
wet ordry?
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):
gcc..As. fALC J"i :1 INwL kit-A &(c:.-&..'\.eA" up hi v+.l, tf-/V\~.I).,/; J.~~kko..~e.. l,v\.C
t../c...5 ~fp 7 e,A, 2-«& iQs.J~ c)~ QV .. eI" fvAf i0!) tdc\'S f ;./\.1,5 '-"ei. Tk--c... k,-~+ t~( e..
(} A S b .I\A-('... .s :d;L '15 Y'-O + L...,) o.r tc , ~.
) 6. RemarkSl/""-!:~~LJr.t1-f'~M~ w.J wler-~t7* ~ ~ ('Ul~ Tf:Rt-fJ!t,e. ~-" LOCetr Ot $16,,)1_ t.,l (2u .('Jo'-S'N)~ t'Q;V'\. " L,A./v..,. e..r .~
~o.r Sv r~(A.C e.. "'-0\.+ cr ~ vV\.f l e-5 ..
C:\Documents and Settings\dturk.DMC\Loca1 Settings\Temporary Internet Files\Content.OutlookWM3Y6S iI\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
7. Contanrinated Waste DUlnp: L-oD t..s 6:00 d.
01111 Revision: Denisonl1.1
Page 30 of49
* Does Level exceed 12 inches above the lowest point on the bottom flexible ~e;rral1e liner (solution
elevation of 5556.14 runsl 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\dturkDMC\Local Settings\Temporary Tntemet Piles\Content.OutlookWM3Y6S1I\Tallings Mgllt System and DMT
Mon Plan Nov 2010 Rv 11 1 ~ Redline.doc
Attachment D
Feet Below Top of Standpipe
N N N ~ ~ ~ ~ N 0 00 (J) ~
(:) (:) (:) (:) (:) (:)
0 0 0 0 0 0
\" ~
1/30/2009
2/28/2009
3/31/2009
4/30/2009
5/31/2009
6/30/2009
7/31/2009
n m 8/31/2009 -9/30/2009
N
+ (,It --.
10/31/2009
11/30/2009
Vl 3 ~ 12/31/2009 roO m Vl en N 1/31/2010
C 2/28/2010 ..,
C» 3/31/2010 -. :::s 4/30/2010
5/31/2010
N
0 6/30/2010
0 c \.D ~ ro .. ru
~ N Vi' 0 ro ~ ~ roO
Vl 0 ~
7/31/2010
8/31/2010
9/30/2010
10/31/2010
RO 11/30/2010
N 12/31/2010
0
~ 1/31/2011
~ 2/28/2011
3/31/2011
4/30/2011
5/31/2011
6/30/2011
7/31/2011
8/31/2011
9/30/2011
10/31/2011
11/30/2011
Attachment E
This attachment has been deliberately left blank.
Attachment F
October 2011
Date
10107/11
10/14/11
10/21/11
10/28/11
Cell 4A LOS Monitoring Information
Weekly measurements in inches
from transducer at the bottom of
the LOS sump.
9.9
7.7
9
8.4
Flow Meter in Gallons
264460
264460
264460
264460
Highest level for the month based on the daily data was 12.3 inches and the lowest level for the
month was 7.0 inches. Total number of gallons pumped was o.
November 2011
Date
11/04/11
11111/11
11/18/11
-11/25/11
Weekly measurements in inches
from transducer at the bottom of
the LOS sump.
9.3
9.7
8.4
11.1
Flow Meter in Gallons
264460
264460
264460
264460
Highest level for the month based on the daily data was 11.9 inches and the lowest level for the
month was 7.7 inches. Total number of gallons pumped was O.
December 2011
Weekly measurements in inches
from transducer at the bottom of
Date the LOS sump. Flow Meter in Gallons
12/02/11 9.5 264460
12/09/11 9.9 264460
12/16/11 13.6 264460
12/23/11 9.7 264460
12/30/11 11.9 264460
Highest level for the month based on the daily data was 14.0 inches and the lowest level for the
month was 7.8 inches. Total number of gallons pumped was O.
For the 4th Quarter 2011, the highest level was 14.0 inches and the lowest level was 7.0 inches.
No (zero) gallons were pumped.
October 2011
Date
10107/11
10/14/11
10/21/11
10/28/11
Cell4B LOS Monitoring Information
Weekly measurements in inches
from transducer at the bottom of
the LDS sump.
2.69
1.85
2.97
2.41
Flow Meter in Gallons
360747
360766
360766
360786
Highest level for the month based on the daily data was 2.97 inches and the lowest level for the
month was 0.74 inches. Total number of gallons pumped was 39.
November 2011
Date
11/04/11
11/11/11
11/18/11
11/25/11
Weekly measurements in inches
from transducer at the bottom of
the LDS sump.
1.02
2.69
2.69
2.97
Flow Meter in Gallons
360912
360947
360953
360958
Highest level for the month based on the daily data was 3.52 inches and the lowest level for the
month was 1.02 inches. Total number of gallons pumped was 178*.
December 2011
Weekly measurements in inches
from transducer at the bottom of
Date the LDS sump. Flow Meter in Gallons
12/02/11 3.25 360964
12/09/11 2.36 13**
12/16/11 2.08 38
12/23/11 3.19 38
12/30/11 2.63 38
Highest level for the month based on the daily data was 4.08 inches and the lowest level for the
month was 2.08 inches. Total number of gallons pumped was 44.
For the 4th Quarter 2011 , the highest level was 4.08 inches and the lowest level was 1 .02 inches.
Total number of gallons pumped was 261.
* On November 3, November 29, December 5, and December 13, 2011, the totalizer indicated
that fluid had been pumped from the Cell 4B LDS. On all of these dates, the pump was off, the
flow rate meter indicated no flow, and the pump start indicator did not indicate any pump
starts. The gallons reported on those days are erroneous. The gallons pumped for both
November and December have been totaled incorporating the erroneous data.
** On December 6, 2011, the processor on Cell 4B was replaced to address problems noted
with the totalizer. The new processor reset the total gallons pumped to zero. The last reading
before the processor was changed was 360970. On December 6, 2011, 13 gallons were
pumped manually to test the system after the maintenance/installation of the new processor.
Geosynt!c Consuftrlnts r_blG 1A
Calculated Action Laakqe Rates for Various Head Conditions
CeJl4A1 White M ... Mill
Bllndfn., Utah
Head Above LIner QlIcUIIMd ActIon ...... Rate
system (feet) ( .. tlons/lere/dIV)
5 222.04
16 314.0
15 384.58
20 444.08
25 496.5
30 543,88
35 587.5
37 604.0
G,oqntec CoMUbnu Table 18
carculated ActIon Llakqe Rates for Various Head Condltfons
Cell 48, WhIte Mell Mill
Bllndln" Utlh
He.d Above Une, Sptlm ClrCIII.tId Actfon Leaklp Rate
rfM" ".non./.ere/clay)
5 211.4
10 817.0
15 369.9
ZO 422.7
25 475.6 -_ ..
SO 528.4
35 510.0
37 S81.2
Max head on Cell 4A FM L
Max elvation (ft.)
FML elevation (ft.)
Head (ft.)
From BAT O&M Table 1A (gallon/acre/day)
Acres of fluid based on maximum level (acres)
Max allowable flow rate (gal/day)
4A -Q4 2011
5589.7
5555.55
34.15
587.5
39.32
23100.5
Max head on Cell 4B FML
Max elvation (ft.)
FML elevation (ft.)
Head (ft.)
From BAT O&M Table 1B (gallon/acre/day)
Acres of fluid based on maximum level (acres)
Max allowable flow rate (gal/day)
4B -Q42011
5579.28
5557.5
21.78
444.08
34.57
15351.85
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 Ce1l4A) or Table
1B (for Ce1l4B) 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
Cell 1 and Cell 3 lOS Monitoring Information -Fourth Quarter 2011
October 2011
Measurement in Measurement in
inches from inches from
Cell Date transducer at the Cell Date transducer at the
bottum of the LDS bottu m of the LDS
sump. sump.
Cell 1 10107/11 Dry Cell 3 10107/11 Dry
10/14/11 Dry 10/14/11 Dry
10/21/11 Dry 10/21/11 Dry
10/28/11 Dry 10/28/11 Dry
November 2011
Measurement in Measurement in
inches from inches from
Cell Date transducer at the Cell Date transducer at the
bottum of the LDS bottum of the LDS
sump. sump.
Cell 1 11/04/11 Dry Cell 3 11/04/11 Dry
11/11/11 Dry 11/11/11 Dry
11/18/11 Dry 11/18/11 Dry
11125/11 Dry 11/25/11 Dry
December 2011
Measurement in Measurement in
inches from inches from
Cell Date transducer at the Cell Date transducer at the
bottum of the LDS bottum of the LDS
sump. sump.
Cell 1 12/02/11 Dry Cell 3 12/02/11 Dry
12/09/11 Dry 12/09/11 Dry
12/16/11 Dry 12/16/11 Dry
12/23/11 Dry 12/23/11 Dry
12/30/11 Dry 12/30/11 Dry
Attachment G
This attachment has been deliberately left blank.