DRC-2021-002242 - 0901a06880e09527

Olv of Waste Management
and Radiation Control
FEB 1 6 2021
Energy Fuels Resources (USA) Inc. 225 Union Blvd. Suite 600 Lakewood, CO, US, 80228 303 974 2140
www.energyfuels.com I ENERGY FUELS
I 1
Yours very tr y,
P?C- ZO2 I- 0 0 zzif-Z
February 10, 2021
VIA EXPRESS DELIVERY
Mr. Ty L. Howard
Director
Division of Waste Management and Radiation Control
Utah Department of Environmental Quality
195 North 1950 West
P.O. Box 144880
Salt Lake City, UT 84114-4880
Re: Transmittal of DMT Performance Standards Monitoring Report and Cell 4A BAT
Performance Standards Monitoring Report for the 4th Quarter of 2020
Dear Mr. Floward:
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 2020, 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 [phone] or
Mr. Terry Slade at [phone].
ENERGY FUELS RESOURCES (USA) INC.
Kathy Weinel
Quality Assurance Manager
Cc David Frydenlund
Terry Slade
Logan Shumway
Scott Bakken
February 10, 2021
VIA EXPRESS DELIVERY
Mr. Ty L. Howard
Director
Division of Waste Management and Radiation Control
Utah Department of Environmental Quality
195 North 1950 West
P.O. Box 144880
Salt Lake City, UT 84114-4880
Energy Fuels Resources (USA) Inc.
225 Union Blvd. Suite 600
Lakewood, CO, US, 80228
303 974 2140
www .energyfuels.com
Re: Transmittal of DMT Performance Standards Monitoring Report and Cell 4A BAT
Performance Standards Monitoring Report for the 4th Quarter of 2020
Dear Mr. Howard:
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 2020, as required under Parts
1.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 [phone] or
Mr. Terry Slade at [phone].
ENERGY FUELS RESOURCES (USA) INC.
Kathy Weinel
Quality Assurance Manager
CC David Frydenlund
Terry Slade
Logan Shumway
Scott Bakken
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
2020
State of Utah
Groundwater Discharge Permit No. UGW370004
Prepared By:
Energy Fuels Resources (USA) Inc.
225 Union Boulevard, Suite 600
Lakewood, CO. 80228
February 10, 2021
TABLE OF CONTENTS
1.0 INTRODUCTION ......................................................................................................................................... 1
2.0 MEASUREMENTS TAKEN AND MONITORING PERFORMED ....................................................... !
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
4.3 QUALITY ASSURANCE EVALUATION AND DATA VALIDATION ...................................................................... 4
4.4 GRAPHIC COMPARISON TO PREVIOUS YEAR ................................................................................................. 5
5.0 WEEKLY FEEDSTOCK STORAGE AREA INSPECTIONS AND INSPECTIONS OF
FEEDSTOCK MATERIAL STORED OUTSIDE THE FEEDSTOCK STORAGE AREA .................. 5
6.0 TAILINGS CELLS AND POND LINER SYSTEM REPAIRS ................................................................ 5
7.0 DECONTAMINATION PADS .................................................................................................................... 6
7.1 SUMMARY OF WEEKLY lNSPECTIONS ............................................................................................................ 6
7.2 ANNUAL INSPECTION OF EXISTING DECONTAMCNATION PAD ....................................................................... 7
7.3 ANNUAL INSPECTION OF NEW DECONTAMINATION PAD .............................................................................. 7
7.4 ANNUAL INSPECTION OF USED OIL AND FuEL TANKS ......................................................................................... 7
8.0 AMMONIUM SULFATE PAD .................................................................................................................... 8
9.0 CELL 4A AND CELL 4B BAT PERFORMANCE STANDARDS REPORT ......................................... 8
9 .1 LDS MONITORING ........................................................................................................................................ 8
9.1.1 Operational Status of LDS Pumping and Monitoring Equipment ........................................................... 8
9.1.2 Measurement of Weekly Fluid Head at the Lowest Point in the Secondary FML ................................... 9
9.1.3 Measurement of the Volume of Fluids Pumped from the LDS ................................................................. 9
9 .2 MEASUREMENT OF WEEKLY WASTEWATER FLUIDS IN CELLS 4A AND 4B ................................................. 10
9.3 SLIMES DRAIN RECOVERY HEAD MONITORING .......................................................................................... JO
10.0 CELL 1, CELL 2, AND CELL 3 LDS MONITORING .......................................................................... 10
l 0.1 OPERATIONAL STATUS OF LDS PUMPING AND MONITORING EQUIPMENT.. ................................................ 10
10.2 MEASUREMENT OF THE VOLUME OF FLUIDS PUMPED FROM THE LDS ....................................................... 11
10.3 MEASUREMENT OF WEEKLY WASTEWATER FLUIDS IN CELLS 1, 2, AND 3 .................................................. 1 l
10.4 SLIMES DRAIN RECOVERY HEAD MONITORING .......................................................................................... 11
11.0 ANNUAL SLIMES DRAIN RECOVERY HEAD REPORT FOR THE CALENDAR YEAR 2020 ... 11
11 .1 INDIVIDUAL SLIMES DRAIN RECOVERY HEAD FOR 2020 ............................................................................ 12
11.2 ANNUAL ASSESSMENT ..................................................................................................................................... 12
11.2.1 Quality Assurance Evaluation and Data Validation ......................................................................... 13
11.3 CONCLUSION .................................................................................................................................................... 14
12.0 QUARTERLY PRECIPITATION DATA ................................................................................................ 14
13.0 SIGNATURE AND CERTIFICATION .................................................................................................... 15
1
LIST OF TABLES
Table 1 -Summary of Waste Water Pool Elevations (In the Text)
Table 2 -New Decontamination Pad Inspection Portal Level (In the Text)
Table 3 -Cell 2 Slimes Drain Recovery Head and SDRE Values for 2020 (Tab C)
Table 4-Cell 2 Slimes Drain Monthly Volumes of Fluids Pumped (Tab C)
ATTACHMENTS
A Tailings Cell Wastewater Elevations
B Notices Pursuant to Part I.G.3 of the GWDP
C Quarterly 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 Cell 4A and Cell 4B Leak Detection System Data for the Quarter and BAT O&M Plan
Tables lA and lB, Cell 4A and 4B Calculations
G Annual Inspection Forms for Existing and New Decontamination Pads and Quarterly
Inspection Forms for the Ammonium Sulfate Area
H Weekly Feedstock Inspection Form -Feedstock Maps
I Quarterly Precipitation Data
11
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 2020
1.0 INTRODUCTION
This is the routine Discharge Minimization Technology ("DMT") Performance Standards
Monitoring Report for the fourth quarter of 2020 (the "quarter") prepared by Energy Fuels
Resources (USA) Inc. ("EFRI"), 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, 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)(2));
• Annual Slimes Drain Compliance (Part I.D.3 (b) (3) and I.F.11);
• Weekly feedstock storage area inspections and inspections of feedstock materials
stored outside of the feedstock storage area (Part I.D.3(f) and Parts I.E.7(d); and
(e));
• Any tailings cell and pond liner system repairs (Part I.E.7 (f) and Part 1.E.(8)(c));
• Weekly New Decontamination Pad Inspection (Part 1.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.8 and 1.E.12 of the
GWDP:
• Leak detection system ("LDS") monitoring for Cell 4A (Part 1.E.8.(a)), and Cell
4B (Part I.E.12); and
• Weekly tailings wastewater pool elevations for tailings Cell 4A (Part I.E.8 (a))
and Cell 4B (Part I.E.12).
During the quarter, the following inspections were also completed:
• LDS monitoring for Cells 1, 2 and 3 pursuant to the Mill's State of Utah
Radioactive Materials License No. UT 1900479 (the "License") (Part 11.3).
1
3.0 WEEKLY TAILINGS WASTEWATER POOL ELEVATION MONITORING
Mill personnel monitored and recorded weekly the elevation of wastewater in the Mill's tailings
cells during this quarter except as noted below, to ensure compliance with the maximum
wastewater elevation criteria mandated by Parts I.E.7(a)2 and I.E.12(a) of the GWDP. The
results of such monitoring, reported as feet above mean sea level ("fmsl"), are included in
Attachment A. Part I.D.2 of the GWDP provides that under no circumstances shall the freeboard
of any tailings cell be less than three feet, as measured from the top of the flexible membrane
liner ("FML"). The top of the FML in Cell 1 is at 5,618.5 fmsl, and the top of the FML in Cell
4B is 5600.4 fmsl. This means that the maximum wastewater pool elevations in Cells 1 and 4B
permitted under Part I.D.2 of the GWDP are 5,615.50, and 5,597.40 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 requirements to meet freeboard elevation limits in
Cell 3 and Cell 4A were eliminated. The solution elevation measurements in Cell 4A are not
required for compliance with freeboard limits but are required for the calculation of the daily
allowable volume of fluids pumped from Cell 4A LDS and are collected for this purpose. The
freeboard limits established by the GWDP and the "License are slightly different; accordingly,
the stricter of the two limits represents the regulatory standard for each cell. As indicated in
Table 1, the applicable freeboard limits were not exceeded during the Quarter for any cell.
Table 1 -Summary of Waste Water Pool Elevations
Tailings Maximum Maximum Maximum
Cell Wastewater Elevation Wastewater Elevation Wastewater
Measured During the Permitted Under Elevation Permitted
Quarter (fmsl) License Condition Under Part I.D.2 of
10.3 (fmsl) the GWDP (fmsl)
Cell 1 5614.33 5,615.40 5,615.50
Cell 3 Not Measured -No Limit No Limit
freeboard limit was (5,602.50*) (5,605.50*)
removed in Q 1 2011
Cell 4A 5588.96 -freeboard No Limit No Limit
limit was removed in (5,593.74**) (5,595.50**)
Ql 2011.
Cell 4B 5566.45 5594.60 5597.40
* The Director approved the removal of the Cell 3 freeboard limit and authorized the use of Cell 4B on January 27,
2011. Cell 3 is nearly full of solids. ** The Director granted a variance from the Cell 4A freeboard limit on January 13, 2011, and approved the removal
of the Cell 4A limit and authorized the use of Cell 4B on January 27, 2011. The previous freeboard limit noted
above for Cell 4A was not set out in the License. The freeboard limit of 5,593.74 for Cell 4A was set out in a letter
from the Director dated November 20, 2008. The approved DMT Plan, Revision 11.1 dated January 2011, included
the removal of the freeboard limit for Cell 4A to be replaced by a freeboard limit for Cell 4B that will accommodate
the freeboard requirements of Cells 1, 4A, and 4B.
2
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.E.7(b)(5) 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.
The GWDP, Part I.D.3(b)(l) states the "Permitee shall at all times maintain the average
wastewater recovery head in the slimes drain access pipe to be as low as reasonably
achievable ... " Part I.D.3(b)(2) states the "effective July 11, 2011, the Permittee shall conduct a
quarterly slimes drain recovery test ... ". Monthly testing was conducted through the second
quarter of 2011. 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.
The GWDP, Part I.E.7(b) requires quarterly monitoring of all slimes drain access pipes in
accordance with I.D.3 as noted above. In addition, for the purposes of monitoring the slimes
drain access pipes, the GWDP Part I.E.7(b) requires: 1) that 1 separate slimes drain recovery test
be performed in each slimes drain for each cell quarterly ( upon commencement of dewatering
operations), 2) designate, operate, maintain and preserve one water level measuring point of each
slimes drain access pipe that has been surveyed by a Utah licensed engineer or land surveyor
(upon commencement of dewatering operations), 3) make all slimes drain recovery head test
( depth to fluid) measurements from the same designated measuring point, and 4) record all fluid
depth measurements 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.
3
Pursuant to Parts the I.F.2 of the GWDP, Section 7.1 of the DMT Plan and correspondence from
the Division of Waste Management and Radiation Control ("DWMRC"), 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 for 2020 iss included in Section 11
of this report.
4.2 Results for the Quarter
In accordance with the requirements described above, 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 for the quarter, are
included as Attachment C to this Report. All measurements were made from the designated fluid
measuring point. The fluid level measuring point was surveyed by a licensed Utah land surveyor
in Q3 2017 after the extension of the slimes drain access pipe. The extension of the slimes drain
access pipe was required due to the Cell 2 cover activities.
Cell 2 Phase 1 cover placement/construction commenced in April 2016. The Phase 1 cover
activities include the placement and compaction of approximately 4.5 feet of soil materials.
These cover placement activities have caused an increase in the measured elevations of the Cell
2 slimes drain fluids. The increased elevations are due to excess pressure from surcharge as a
result of cover activities. The increase in elevations was expected and is unavoidable during
cover construction activities. Cover construction activities included the installation of a series of
piezometers across Cell 2. Fluid levels are monitored and recorded in the piezometers. Initially,
fluid measurements in the piezometers were conducted weekly. After the completion of the
Phase 1 activities, the fluid measurements were conducted monthly. The data as well as monthly
contours of the fluid levels are included in Tab C. The data indicate that the increase in fluid
levels in Cell 2 is directly related to the placement of fill and cover construction activities.
The slimes drain pump in Cell 2 is activated and deactivated by a float mechanism and water
level probe system. When the water level reaches the level of the float mechanism the pump is
activated. Pumping then occurs until the solution level reaches the lower probe which turns the
pump off. It is important to note that as a result of the added cover materials and the increase in
solution elevations, additional volumes of solutions have been pumped since the commencement
of cover activities began.
4.3 Quality Assurance Evaluation and Data Validation
EFRI 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.
4
As a result of its quality assurance evaluation and data validation review, EFRI has concluded
that the 2009, and 2010 monthly slimes drain tailings fluid elevation measurements, the 2011
monthly (through June) and quarterly (July forward), and the quarterly 2012, 2013, 2014, 2015,
2016, 2017, 2018, 2019, and 2020 slimes drain tailings fluid elevation measurements to date
meet the test performance standards found in Part I.D.3(b)(2) and I.E.7(b) of the GWDP and can
be used for purposes of determining compliance with the requirements of Part I.D.3(b) of the
GWDP.
4.4 Graphic Comparison to Previous Year
A graph showing the final depth to stable water level readings for 2009 through the current 2020
period is included as Attachment D.
5.0 WEEKLY 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 in compliance with the requirements of Part I.D.11 of the
GWDP. The results of these inspections are recorded on the Weekly Mill Inspection forms,
which are available at the Mill for inspection.
In the closeout letter for the first quarter 2013 DMT Report, dated July 23, 2013, DWMRC wrote
"EFRI noted standing water in one of the feedstock storage areas. Language in the report referred
to the standing water as a "small amount." The DWMRC requests that in future quarterly reports,
EFRI be more complete in quantifying and describing the location of standing water discovered
in feedstock storage areas." To comply with this request, EFRI has attached the Feedstock
Storage Area Maps ("Feedstock Maps") completed during the weekly Feedstock Storage Area
inspections as Attachment H. When present, the Feedstock Maps will include the areal extent (in
feet) and depth (in inches) of any standing water noted during the weekly inspections. During
the quarter, no standing water was noted during the weekly inspections. Standing water when
noted is the result of precipitation which has fallen and accumulated on the ore stock piles.
6.0 TAILINGS CELLS AND POND LINER SYSTEM REPAIRS
The liner systems at Cells 1, 2, 3, 4A, and 4B were inspected on a daily basis. The results of
those inspections are recorded on the Mill's Daily Inspection Data sheets, which are available at
the Mill for review.
In accordance with Part I.E.8(c) of the GWDP, in the event that any liner defect or damage is
identified during a liner system inspection, the Mill shall complete repairs in accordance with
Section 9.4 of the Geosyntec Consultants Cell 4A Construction Quality Assurance Plan. Further,
Part I.F.2 of the GWDP provides that when a liner repair is performed at any tailings cell, a
Repair Report shall be prepared and included with the next quarterly DMT report.
5
On October 29, 2020 during a routine inspection of the Cell liners, Mill Environmental Personnel
noted a small tear in the liner of Cell 4A. The tear is on the west dike, on top of the liner,
approximately 2 to 3 feet from the anchor trench. The tear is approximately 1 inch by 1 inch.
The tear is not within the solution storage area of the cell. Specific details regarding the timeline
of events surrounding the Cell 1 liner inspections and discovery of damage are included in the 5-
day Notice to DWMRC included as Attachment B to this report.
Mill Environmental Personnel contacted the EFRI Quality Assurance Manager ("QAM") on
October 29, 2020 to report the liner damage. EFRI noted that prior to the inspection, routine
maintenance activities were conducted on the Cell 4A piping in the vicinity of the tear. The tear
appears to be the result of a dropped tool or brace.
Initial notice of this outage was given by telephone to Mr. Russ Topham of the DWMRC at
approximately 2:30pm on Thursday October 29, 2020 (within 24 hours of the QAM receiving
notice, and within 24 hours of Mill Environmental Personnel discovery).
In accordance with Part 1.E.8(c) of the GWDP, EFRI repaired damage to the Cell 4A Liner
System on November 4, 2020.
Repairs were performed by qualified liner repair personnel. Pursuant to Part 1.F.2 a Liner Repair
Report is included with this DMT Report as Attachment E.
7.0 DECONTAMINATION PADS
7.1 Summary of Weekly Inspections
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, and 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. Table 2 below indicates the water level measurements in each portal measured during
the quarter.
6
Table 2 -New Decontamination Pad Inspection Portal Level for the Quarter
Date Portal 1 Portal 2 Portal 3
Liquid Level (ft.) Liquid Level (ft.) Liquid Level (ft.)
10/1/2020 0.00 0.00 0.00
10/8/2020 0.00 0.00 0.00
10/16/2020 0.00 0.00 0.00
10/23/2020 0.00 0.00 0.00
10/30/2020 0.00 0.00 0.00
11/6/2020 0.00 0.00 0.00
11/13/2020 0.00 0.00 0.00
11/20/2020 0.00 0.00 0.00
11/25/2020 0.00 0.00 0.00
12/4/2020 0.00 0.00 0.00
12/9/2020 0.00 0.00 0.00
12/18/2020 0.00 0.00 0.00
12/24/2020 0.00 0.00 0.00
12/31/2020 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 (b) 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.
7.2 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 2020
annual inspection was reported in the Second Quarter DMT report submitted on August 14,
2020. The annual inspection for 2021 will be conducted during the second quarter and reported
in the DMT Repo1t due on or before September 1, 2021.
7.3 Annual Inspection of New Decontamination Pad
Annual inspections of the new decontamination pad must be conducted during the second quarter
of each year. The documentation for the 2020 annual inspection was reported in the Second
Quarter DMT report submitted on August 14, 2020. The annual inspection for 2021 will be
conducted during the second quarter and reported in the DMT Report due on or before
September 1, 2021.
7 .4 Annual Inspection of Used Oil and Fuel Tanks
The used oil tank and storage area and the fuel tanks and storage areas were inspected during the
second quarter 2020 as required by the Spill Prevention, Control and Countermeasures Plan and
7
the DMT Plan. The documentation for the 2020 annual inspection was reported in the Second
Quarter DMT report submitted on August 14, 2020. The annual inspection for 2021 will be
conducted during the second quarter and reported in the DMT Report due on or before
September 1, 2021.
8.0 AMMONIUM SULFATE PAD
EFRI implemented Phase I of the approved May 7, 2012 Mill Nitrate Corrective Action Plan
("CAP") through the installation of the ammonium sulfate concrete pad. The ammonium sulfate
cover area is required to be inspected quarterly for eight (8) quarters and annually thereafter. The
eighth quarterly inspection was completed in August 2017.
The ammonium sulfate pad annual inspections were completed in May 2020 as required by the
CAP and DMT plan. Repairs and maintenance, including caulking and sealing of cracks, were
completed following the inspection to prevent additional deterioration. No repairs were needed
on the asphalt portion of the pad. The documentation for the 2020 annual inspection was
reported in the Second Quarter DMT report submitted on August 14, 2020.
The annual inspection for 2021 will be conducted during the second quarter and reported in the
DMT Report due on or before September 1, 2021.
9.0 CELL 4A AND CELL 4B BAT PERFORMANCE STANDARDS REPORT
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 both 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.
Cell 4A
During the quarter, there were no failures of any pumping or monitoring equipment that were not
repaired and made fully operational within 24-hours of discovery, as contemplated by Part
I.E.8(a)(l) of the GWDP.
Cell 4B
During the quarter, there were no failures of any pumping or monitoring equipment that were not
repaired and made fully operational within 24-hours of discovery, as contemplated by Part
I.E.12(a)(l) of the GWDP.
8
9.1.2 Measurement of Weekly Fluid Head at the Lowest Point in the Secondary FML
The measurements of 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 1-foot level above the lowest point in the lower FML on the Cell
floor (where for purposes of compliance monitoring, this 1-foot distance equates to 2.28 feet
[27.36 inches] above the LDS system transducer), as stipulated by Part 1.E.8(a)(2) of the GWDP.
During the quarter, the fluid head in the Cell 4A LDS sump did not exceed 12.4 inches above the
LDS transducer.
As can be seen from a review of Attachment F, at no point in the quarter did the fluid head in the
Cell 4B LDS sump exceed a 1-foot level above the lowest point in the lower FML on the Cell
floor, as stipulated by Part 1.E.12(2) of the GWDP. For the purposes of compliance monitoring,
this 1-foot distance equates to 2.25 feet (27 inches) above the LDS system. During the quarter,
the fluid head in the Cell 4B LDS sump did not exceed 10.56 inches above the LDS transducer.
9.1.3 Measurement of the Volume of Fluids Pumped from the LDS
The measurements of the volume of fluids pumped are provided in Attachment F.
Cell 4A
As noted in Section 9.1.1 above, the Cell 4A LDS flow meter was erroneously recording that
liquids were pumped from the LDS when there were no fluids being removed from the LDS. As
can be seen from a review of Attachment F, 2,056 gallons of fluid were reported as pumped from
the Cell 4A LDS for the quarter. The average daily LDS flow volume in Cell 4A did not exceed
24,160 gallons/day, as stipulated by Part 1.E.8(a)(3) of the GWDP.
The 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 Director dated January 27, 2011 that
approved the use of Cell 4 B, and a subsequent letter dated March 15, 2011, stated approval of the
DMT and Cell 4A O&M Plans, which 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 are
documented in order to calculate the maximum daily allowable flow volume, in accordance with
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 33.41 feet, the allowable flow rate would be approximately 587.46 gallons/acre/day
(23,099 gallons/day for the cell), as determined by Table lA of the Mill's Cell 4A and 4B BAT
Operations and Maintenance Plan, and assuming a liner elevation of 5555.55 feet and
approximately 39.32 acres of liquid area. The average daily flow volume in Cell 4A did not
exceed the calculated flow volume of 23,099 gallons/day. The gallons of fluid pumped from the
Cell 4A LDS during the quarter and did not exceed the calculated maximum allowable daily
9
flow volume. The allowable flow rate calculation for the quarter for Cell 4A along with Table
lA is included in Attachment F of this report.
Cell 4B
As can be seen from a review of Attachment F, 424 gallons of fluid were pumped from the Cell
4B LDS for the quarter. The average daily LDS flow volume in Cell 4B did not exceed the
26,145 gallons/day limit, as stipulated by Part I.E.12(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 9.02 feet. The allowable flow rate would
therefore be approximately 317 .00 gallons/acre/day (9,947 gallons/day for the cell), as
determined by Table lB of the Mill's Cell 4A and 4B BAT Operations and Maintenance Plan,
and assuming a liner elevation of 5557.5 feet and approximately 31.38 acres of liquid area. The
average daily flow volume in Cell 4B did not exceed the calculated flow volume of 9,947
gallons/day. As mentioned above, a total of 424 gallons of fluid were pumped from the Cell 4B
LDS during the quarter and did not exceed the calculated maximum allowable daily flow
volume. The allowable flow rate and average daily flow rate calculations for the quarter for Cell
4B are included along with Table lB in Attachment F of this report.
9.2 Measurement of Weekly Wastewater Fluids in Cells 4A and 4B
Weekly fluid elevations for Cells 4A and 4B for the quarter are provided in Attachment A along
with elevations for Cell 1.
9.3 Slimes Drain Recovery Head Monitoring
As the Mill has not initiated pumping of the Cell 4A or Cell 4B slimes drain systems at this time,
monthly recovery head tests and fluid level measurements are not required at this time pursuant
to Part I.E.8(b) of the GWDP.
10.0 CELL 1, CELL 2, AND CELL 3 LDS MONITORING
The requirement in Section 3.l(a) of the DMT Plan to monitor the LDS for Cells 1, 2, and 3 is a
requirement of the License, and not a DMT performance monitoring standard required by Parts
I.D.3 or I.E.7 of the GWDP. However, DWMRC has requested that the LDS monitoring for
Cells 1, 2, and 3 be included on the DMT inspection forms and that the results of the monitoring
be reported in the quarterly DMT reports. The Cells 1, 2, and 3 LDS monitoring data are
included in Attachment F.
10.1 Operational Status of LDS Pumping and Monitoring Equipment
The LDS pumping and monitoring equipment for each of Cell 1, Cell 2, and Cell 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.
10
For Cell 1, during the quarter, there were no failures of any pumping or monitoring equipment
not repaired and made fully operational within 24 hours of discovery.
For Cell 2, during the 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 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 Cells 1, 2 or 3 LDSs during the quarter because no fluids were
detected in the Cells 1, 2 or Cell 3 LDSs.
10.3 Measurement of Weekly Wastewater Fluids in Cells 1, 2, and 3
A summary of the fluid elevations for the Cells 1, 2 and 3 LDSs for the quarter are provided in
Attachment F. The LDS for Cells 1, 2, and 3 were dry during the quarter.
10.4 Slimes Drain Recovery Head Monitoring
As the Mill has not initiated pumping in the Cell 3 slimes drain system at this time, monthly
recovery head tests and fluid level measurements are not required at this time.
11.0 ANNUAL SLIMES DRAIN RECOVERY HEAD REPORT FOR THE
CALENDAR YEAR 2020
As previously noted, Cell 2 Phase 1 cover placement/construction commenced in April 2016.
The Phase 1 cover activities include the placement and compaction of approximately 4.5 feet of
soil materials. These cover placement activities have caused an increase in the measured
elevations of the Cell 2 slimes drain fluids. The increased elevations are due to excess pressure
from surcharge as a result of cover activities. The increase in elevations was expected and is
unavoidable during cover construction activities. The increase in fluid levels in Cell 2 is directly
related to the placement of 4.5 feet of fill and cover construction activities.
The GWDP dated March 19, 2019 requires an annual slimes drain assessment be included with
the 4th quarter DMT Report.
11
11.1 Individual Slimes Drain Recovery Head for 2020
The individual slimes drain recovery head monitoring data for calendar year 2020, 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. These results
were used for the assessments completed pursuant to the GWDP. 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. The water
level measurements are referred to as the slimes drain recovery elevations ("SDRE") in the Table
3 in Attachment C.
11.2 Annual Assessment
Parts I.D.3, I.F.11, and ILG of the GWDP requires an annual assessment of the slimes drain
compliance. The remainder of this section discusses the 2020 Cell 2 slimes drain data and
assesses the compliance against the GWDP.
Part I.D.3 requires an annual report be submitted that includes: 1) Monthly volumes of fluid
pumped from the slimes drain for each applicable tailings disposal cell; 2) The results of all
quarterly slimes drain recovery tests; 3) A calculation of average annual wastewater recovery
elevation in the slimes drain access pipe, and; 4) The annual report shall include an assessment
and verification that the maximum fluid volume which could practicably be extracted from the
slimes drain in accordance with the systems in place was removed. In addition, the GWDP
requires the submission of a Slimes Drain Compliance Plan on or before January 19, 2020. The
Slimes Drain Compliance Plan was submitted to DWMRC as required by the GWDP under
separate cover on January 16, 2020.
Monthly volumes of fluid pumped are included in Table 4 in Attachment C. The results of the
four quarterly slimes drain recovery tests are included in Attachment C.
The amount of fluid pumped from the Cell 2 slimes was maximized in 2020. As previously
stated the added cover materials and the increase in solution elevations.
The slimes drain pump was lowered to the lowest point practicable to maximize the length of
time the pump operates. In addition, the slimes drain pump in Cell 2 is activated and deactivated
by a float mechanism and water level probe system. When the water level reaches the level of
the float mechanism the pump is activated. Pumping then occurs until the solution level reaches
the lower probe which turns the pump off. This system, rather than a timed system, assures that
the pump operates the maximum time practicable thus maximizing the amount of fluid pumped.
No unscheduled downtimes of the pump in the Cell 2 slimes were noted during 2020, and the
maximum fluid volume which could practicably be extracted from the slimes drain in accordance
with the systems in place was removed. No additional optimization of the system is possible and
EFRI has maximized the system components.
Part I.F.11, in addition to the requirements of I.D.3 items listed above, requires the inclusion of:
c) a time series chart to show trends of the recovery water level elevations at each slimes drain.
12
d) the results of a quality assurance evaluation and data validation. The validation shall provide
written descriptions and findings that evaluate all data collected, data collection methods, and all
related calculations and verification of the accuracy and reliability of both the data and
calculations reported required by this Permit, and e) a demonstration of compliance with Part
I.D.3(b) and I.E.7(b) of the Permit.
A time series plot showing trends of the recovery fluid level elevations is included in Attachment
D. It is important to note that a downward trend was observed prior to the cover construction
activities in 2016. The surcharge resulting from the cover construction is clearly visible in the
2016 measurements. It is important to note that due to the maximization of pumping, the trend
since 2016 has been overall downward indicating that the maximized pumping is effectively
removing the surcharged fluids and fluid levels are or will be decreasing.
11.2.1 Quality Assurance Evaluation and Data Validation
Per the requirements of Part I.F.11, EFRI 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.
The 2020 Cell 2 slimes drain data are usable for the intended purpose of determining compliance
with the GWDP requirements. The data and data collection methods met the following GWDP
criteria:
• The average wastewater recovery head in the slimes drain access pipe was maintained as
low as reasonable achievable because EFRI maximized the pumping;
• Quarterly head tests were performed. The head tests met the duration requirements
(includes a duration of at least 90-hours, as measured from the time that pumping ceases);
• Quarterly head tests achieve 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; and
• Water level depth measurements were collected from a designated measuring point that
has been surveyed by a Utah Licensed Land Surveyor.
The calculations contained in this annual assessment are based on validated data and have been
performed as required in the GWDP. All calculations and data were verified by the EFRI QAM
for accuracy and completeness. The calculations are considered accurate and reliable.
While the historic data are not used for the calendar year 2020 assessment under the GWDP, the
quality assurance evaluation and data validation are included here for completeness. As a result
of the quality assurance evaluation and data validation review, EFRI has concluded that the
2009, 2010, 2011, 2012, 2013, 2014, 2015, 2016, 2017, 2018, 2019 and 2020 slimes drain
tailings fluid elevation measurements meet the test performance standards found in Part I.D.3(b)
and are also usable for the intended purpose.
Part 11.G of the GWDP specifies records contents for data collected under the GWDP. The data
collected during the quarterly slimes drain head tests meet the requirements of Part ILG and
13
includes date, time, place the measurements were made and personnel making the measurements.
Since no laboratory analyses were performed no date and time for the analyses or certified
laboratory are necessary. Measurement techniques and results are discussed above.
11.3 Conclusion
Based on the discussions above and the data in Attachment C, the annual slimes drain
compliance has been achieved for Cell 2 in 2020. Cell 2 slimes drain pumping and monitoring
were completed in accordance with Part I.D.3(b) and I.E.7(b) of the Permit for the reasons stated
above. Additional detail regarding the Cell 2 slimes drain pumping system are included in the
Slimes Drain Compliance Plan, which was submitted to DWMRC under separate cover on
January 16, 2020.
12.0 QUARTERLY PRECIPITATION DATA
Pursuant to a verbal request from DWMRC personnel, EFRI is providing the quarterly
precipitation data in the quarterly DMT reports. The data are collected at the Mill, by the EFRI
Field Staff, using an on-site rain gauge. The data are included as Attachment I to this report.
14
13.0 SIGNATURE AND CERTIFICATION
This document was prepared by Energy Fuels Resources (USA) Inc.
Energy Fuels Resources (USA) Inc.
By:
Scott A. Bakken Date l
Vice President, Regulatory Affairs
15
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,
including the possibility of fine and imprisonment for knowing violations.
Scott A. Bakken
Vice President, Regulatory Affairs
Energy Fuels Resources (USA) Inc.
16
Attachment A
Date Cell 1 Cell 3 1 Cell 4A 2 Cell 4B 3
Free board 5615.40 -RML 5594.60 -RML
Limit 5615.50 -GWDP No Limit 5597.40 -GWDP
10/1/2020 5614.26 No Longer Required 5588.96 5564.34
10/8/2020 5614.33 No Longer Required 5588.87 5565.47
10/16/2020 5614.06 No Longer Required 5588.81 5566.11
10/23/2020 5613.94 No Longer Required 5588.84 5566.45
10/30/2020 5614.05 No Longer Required 5588.51 5565.99
11/6/2020 5614.02 No Longer Required 5588.43 5566.52
11/13/2020 5614.07 No Longer Required 5588.75 5566.08
11/20/2020 5614.07 No Longer Required 5588.75 5566.05
11/25/2020 5613.97 No Longer Required 5588.59 5565.99
12/4/2020 5613.94 No Longer Required 5587.87 5565.03
12/9/2020 5613.97 No Longer Required 5588.63 5566.05
12/18/2020 5614.02 No Longer Required 5588.81 5566.09
12/24/2020 5614.09 No Longer Required 5588.85 5566.11
12/31/2020 5614.09 No Longer Required 5588.93 5566.10
1Cell 3 is nearly full of solids. The freeboard limit is no longer required and the weekly measurements are no
longer required per the January 27 and March 14, 2011 Jetters from DWMRC.
2 The previous freeboard limit of 5,593.74 for Cell 4A is set out in a letter from the Director dated November
20, 2008. EFRI proposed in the DMT Plan revision dated November 12, 2010 the removal of the freeboard
limit for Cell 4A to be replaced by a freeboard limit for new Cell 4B that will accommodate the freeboard
requirements of Cells 3, 4A, and 4B. The Director granted a variance from the Cell 4A freeboard limit on
January 13, 2011 and approved the removal of the Cell 4A limit and the use of Cell 4B on January 27, 2011.
The weekly measurements are no longer required for compliance with freeboard limts, but are required for the
calculation of the daily allowable volume of fluids pumped from the Cell 4A LDS.
3 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 4B at this time.
Attachment B
r-/1.J)lf!l
:_i:.TNERGYFUELS
VIA EMAIL AND EXPEDITED DELIVERY
November 3, 2020
Mr. Ty L. Howard
Director
Division of Waste Management and Radiation Control
Utah Department of Environmental Quality
195 North 1950 West
Salt Lake City, UT 84116
Re: White Mesa Uranium Mill
Utah Ground Water Discharge Permit No. UGW3700004
Energy Fuels Resources (USA) Inc.
225 Union Blvd. Suite 600
Lakewood, CO, US, 80228
303 974 2140
www.energyfuels.com
White Mesa Uranium Mill -Notice Pursuant to Parts I.E.8.c) and I.G.3 of the Permit
Dear Mr. Howard:
Please take notice pursuant to Parts I.E.8.c) and I.G.3 of the White Mesa Mill's (the "Mill's") State of
Utah Groundwater Discharge Permit No. UGW370004 (the "Permit"), that Energy Fuels Resources
(USA) Inc. ("EFRI"), as operator of the Mill and holder of the Permit, identified damage to the Cell 4A
Liner System as described in more detail below.
Repairs to the liner will be completed in accordance with Section 9.4 of the approved June 2007
Geosyntec Consultants Cell 4A Construction Quality Assurance Plan. Repairs are scheduled for the
latter part of the week of November 2, 2020, weather permitting. As required by Part I.E.8.c) of the
permit a repair report will be submitted to the Director with the next quarterly Discharge Minimization
Technology ("DMT") Report (41h Quarter 2020, due on or before March 1, 2021) following completion
of the repairs. The cell will remain in service during and after the repairs.
1. Facts and Background Information
a) Part 1.E.8.c) of the Permit requires that:
"Liner Maintenance and Repair -all repairs to the liner shall be completed in accordance
with Section 9.4 of the approved June 2007 Geosyntec Consultants Cell 4A Construction
Quality Assurance Plan (CQA/QC Plan) as found in Table 5 of this Permit. Repairs shall
be performed by qualified liner repair personnel and shall be reported in a Liner Repair
Report, certified by a Utah licensed Professional Engineer. The Liner Repair Report shall
be submitted to for Director approval, in accordance with Part I.F.3 of the Permit. Any
leak, hole, or other damage to the liner will be reported to the Director pursuant to the
requirements found in Part I.G.3."
b) Although Part 1.G.3 of the Permit is stated to apply to circumstances where the Permittee
fails to maintain DMT or Best Available Technology ("BAT") standards, Part I.E.8.c)
Letter to Ty L. Howard
November 3, 2020
Page 2 of 3
requires that the notification provisions of Part I.G.3 also apply to liner defects or damage,
regardless of whether or not the liner defect or damage constitutes a failure of DMT or
BAT. Under Part I.G.3, the Permittee is required to submit to the Director a notification
and description of the defect or damage orally within 24-hours of the Permittee's
discovery, followed by written notification within five calendar days."
c) On October 29, 2020 during a routine inspection of the Cell liners, Mill Environmental
Personnel noted a small tear in the liner of Cell 4A. The tear is on the west dike, on top of the
liner, approximately 2 to 3 feet from the anchor trench. The tear is approximately 1 inch by 1
inch (see Attachment 1). The tear is not within the solution storage area of the cell.
d) Mill Environmental Personnel contacted the EFRI Quality Assurance Manager ("QAM") on
October 29, 2020 to report the liner damage.
e) EFRI noted that prior to the inspection, routine maintenance activities were conducted on the
Cell 4A piping in the vicinity of the tear. The tear appears to be the result of a dropped tool or
brace.
2. Actions taken
The following actions were taken following identification of the liner tear.
a) Initial notice of this outage was given by telephone to Mr. Russ Topham of the Division of
Waste Management and Radiation Control ("DWMRC") at approximately 2:30pm on
Thursday October 29, 2020 (within 24 hours of the QAM receiving notice, and within 24
hours of Mill Environmental Personnel discovery).
b) EFRI opened an investigation into the possible causes.
c) Repairs were scheduled.
3. Actions Taken to Prevent a Recurrence of This Incident
The following actions will be taken to prevent a reoccurrence of this incident:
As discussed above, the liner tear was identified, and likely occurred due to routine maintenance
activity.
During routine monthly training, Mill Personnel will be reminded to take extra precautions with tools
and equipment when performing maintenance activities on or near the cell liners.
4. Required Reporting
As required by Part I.E.8.c) of the permit and by the approved June 2007 Geosyntec Consultants Cell 4A
Construction Quality Assurance Plan, a repair report will be submitted to the Director with the next
Letter to Ty L. Howard
November 3, 2020
Page 3 of 3
quarterly DMT Report following completion of the repairs. Repairs are scheduled for the latter part of
the week of November 2, 2020, weather permitting. The repair report will be submitted with the fourth
quarter 2020 DMT Report on or before March 1, 2021. The repair report will contain the following
elements:
• Repair narrative describing the nature of the damage and the repair work completed to repair the
damage.
• Repair material type used to complete the repair
• Repair material description
• Post repairs test specifications
• Test Methods (ASTM or other)
• Daily reports during the repair work
• Repair test results
• Quality Assurance/Quality Control Information
5. Affirmative Defense
EFRI does not believe that identification of a defect or damage to the Cell 4A liner caused by
maintenance activities and repair of such defect or damage in accordance with the Mill's Liner
Maintenance Provisions constitutes a failure of BAT under the Permit. Further, the damage to the Cell
4A liner was above the level of any tailings contained in the cell. As a result, EFR is not making a claim
for an affirmative defense under Part I.G.3 of the Permit.
If you have any questions, please contact me at [phone].
1(::/f;~
ENERGY FUELS RESOURCES (USA) INC.
Kathy Weinel
Quality Assurance Manager
cc Scott Balcken
David Frydenlund
Julia Hoffmeier
Tanner Holliday
Gartin Palmer
Logan Shumway
Terry Slade
Steve Snyder
ATTACHMENT 1
Attachment C
Table 3
Cell 2 Slimes Drain Recovery Head and SDRE Values for 2020
2020 Test Elevation of Reported Level SDRE Values
Closing Date Measurement (feet) (Reported as fmsl)
Point (fmsl)
2/25/2020 5>624.17 • 28.53 5S95.64
6/8/2020 5624.1'7 I 28.61 5595.56
9/8/2020 5624.17, I 28.38 5595.19 I
11/23/2020 562~.17 I 28.35 I $595$2 <
I IE2020 22S82.81 I
N2020 4
2020 Average S59'5.7G
Recovery
Elevation ;1
I \ -
Table 4
Cell 2 Slimes Drain Monthly Volumes of Fluids Pumped
Total Pumped by Month
Date (gal~
January-20 85791
February-20* 72593
March-20 91513
April-20 81454
May-20 85725
June-20* 75640
July-20 84720
August-20 84236
September-20* 72815
October-20 87111
November-20* 73744
December-20 87767
2020-'f otal 983109
*Pursuant to Part I.D.3(b) of the January 19, 2018 GWDP, slimes
darin recovery tests were performed quarterly. The recovery tests
(and GWDP) require the pump to be turned off for 90 hours. No
pumping of slimes drain fluid occurs during the recovery test. Less
volumes are reported during the months in which the recovery tests
are conducted.
QUARTERLY HEAD MEASUREMENT TEST
locatio White Mesa Mill
Slimes Cell # 2
2/19/20
700 39.90
800 39.36
900 38.94
1000 38.58
1100 38.02
1200 37.70
1300 37.34
1400 37.02
1500 36.75
2/20/20
33.94
33.81
33.70
33.60
33.51
33.38
33.24
33.15
33.02
Date: 2/19/2020-2/25/2020
Sampler: Deen Lyman, Tanner Holliday
2/21/20 2/22/20 2/23/20 2/24/20
31.65 30.21 29.56 28.90
31.61 28.89
31.56 28.88
31.49 28.86
31.44 28.85
31.35 28.83
31.27 28.79
31.20 28.76
31.09 28.74
Comments:
2/25/20
28.53
28.53
28.53
QUARTERLY HEAD MEASUREMENT TEST
Location: White Mesa Mill
Slimes Cell# 2
6/2/20
700 40.67
800 39.90
900 39.25
1000 38.79
1100 38.37
1200 37.82
1300 37.53
1400 37.08
1500 36.85
Comments:
6/3/20
34.14
33.91
33.68
33.60
33.47
33.30
33.20
33.07
32.96
Date: 6/2/2020-6/8/2020
Sampler: Deen Lyman, Tanner Holliday
6/4/20 6/5/20 6/6/20 6/7/20
31.69 30.56 29.21 28.93
31.63 30.53
31.58 30.49
31.50 30.45
31.43 30.41
31.37 30.35
31.31 30.31
31.24 30.26
31.17 30.20
6/8/20
28.61
28.61
28.61
QUARTERLY HEAD MEASUREMENT TEST
Locatio White Mesa Mill
Slimes Cell # 2
9/2/20
700 40.71
800 39.98
900 39.59
1000 39.11
1100 38.65
1200 38.22
1300 37.89
1400 37.51
1500 37.24
Comments
9/3/20
34.20
34.09
33.91
33.80
33.63
33.53
33.42
33.28
33.20
Date: 9/2/2020-9/8/2020
Sampler: Deen Lyman, Tanner Holliday
9/4/20 9/5/20 9/6/20 9/7/20
31.92
31.88
31.84
31.78
31.74
31.65
31.58
31.50
31.43 29.89 29.27 28.8
9/8/20
28.38
28.38
28.38
QUARTERLY HEAD MEASUREMENT TEST
Location: White Mesa Mill
Slimes Cell # 2
11/17/20
700 41.38
800 40.18
900 39.59
1000 39.19
1100 38.68
1200 38.30
1300 37.89
1400 37.47
1500 37.18
Comments:
11/18/20
33.90
33.85
33.70
33.57
33.40
33.25
33.14
32.96
32.89
Date: 11/17/20-11/23/20
Sampler: Deen Lyman, Tanner Holliday
11/19/20 11/20/20 11/21/20 11/22/20
31.60 30.54 29.45 28.73
31.54 30.51
31.50 30.48
31.45 30.44
31.39 30.40
31.32 30.34
31.25 30.30
31.18 30.26
31.11 30.22
11/23/20
28.35
28.35
28.35
E Fuels R (USA) Inc. White M Mill Cell 2 Standoioe p· (ft.) . , .. . ,
Piezometer 6/16/2016 6/22/2016 6/30/2016 1n12016 7/14/2016 7/22/2016 7/28/2016 8/5/2016 8/11/2016
C2-P01 11.46 11.34 11.22 11 .17 11.22 11.13 11.01 10.94 11.00
C2-P02 8.98 8.94 13.96 13.79 13.73 13.54 13.44 13.36 13.43
C2-P03 13.23 13.01 12.91 12.66 12.71 12.72 12.55 12.25 12.22
C2-P04 10.91 10.82 15.78 15.66 15.70 15.62 15.24 15.14 15.16
C2-P05 14.04 13.95 18.89 18.80 18.73 18.73 18.64 18.37 18.31
C2-P06 17.52 17.45 17.32 17.29 17.26 17.12 16.96 16.87 16.91
C2-P07 15.21 15.07 15.09 15.02 15.03 15.00 14.30 14.23 14.30
C2-P08 18.69 18.56 18.54 18.48 18.46 18.45 18.30 18.19 23.26
C2-P09 25.25 23.76 23.86 23.82 23.91 23.71 23.60 23.50 23.52
C2-P10 22.49 21.93 22.62 22.80 22.96 23.08 22.78 22.74 27.87
C2-P11 20.71 20.45 20.78 20.79 20.91 20.92 20.35 20.31 25.35
C2-P12 21.12 19.72 25.61 25.77 25.97 26.06 25.89 25.48 25.61
C2-P13 16.85 16.83 21.72 21.55 21.48 21.47 21.30 21.14 21.10
C2-P14 22.85 22.56 22.60 22.65 22.75 22.60 22.40 22.38 22.46
C2-P15 21.37 21.17 21.20 21.16 21.21 21.08 20.80 20.75 20.51
C2-P16 20.24 20.01 20.06 20.02 20.10 20.02 19.80 19.71 19.78
C2-P17 23.01 22.87 22.90 22.75 22.77 22.75 22.60 22.47 22.55
C2-P18 18.70 18.65 18.62 18.52 18.57 18.58 18.38 18.26 18.31
C2-P19 10.31 10.28 10.31 10.35 10.50 10.57 10.50 10.50 10.65
C2-P20 17.15 17.10 17.02 16.97 16.98 16.97 16.82 16.72 16.75
C2-P21 14.96 14.88 14.87 14.76 14.82 14.85 14.68 14.58 14.65
C2-P22 12.42 12.34 12.42 12.30 12.40 12.48 12.32 12.23 12.34
C2-P23 9.93 9.76 9.74 9.65 9.73 9.85 9.78 9.72 9.76
Notes:
1. Piezometers 9 and 15 were found broken at a joint due to construction work in the area between July 28, 2016 and August 5, 2016.
DTW readings on August 5, 2016 were taken before these piezometers were repaired.
2. Piezometer 3 was hit by a vehicle on July 11, 2018. It was a clean break and the water levels were able to be read for this date.
The piezometer was repaired and a new elevation measured on September 11, 2018.
-------,I ---------------,----, ------------------------------------.--.----------------,---1
'
Piezometer 8/19/2016 8/26/2016 9/2/2016 9/9/2016 9/16/2016 9/23/2016 9/30/2016 10ll/2016 10/13/2016 10/21/2016 10/28/2016
C2-P01 10.86 10.81 13.14 13.12 13.08 12.70 12.64 12.66 12.53 12.71 12.59
C2-P02 13.02 12.80 12.42 12.45 12.30 12.08 11.69 11.67 11.58 11.79 11.71
C2-P03 11.75 11 .73 16.62 16.62 16.18 15.86 15.89 15.97 15.85 16.00 15.87
C2-P04 15.02 14.71 14.42 13.97 13.88 13.57 13.55 13.10 12.84 12.91 12.78
C2-P05 17.95 17.90 17.83 17.83 17.50 17.44 17.25 17.35 17.20 17.30 17.15
C2-P06 16.34 16.30 16.05 15.99 15.70 18.82 18.72 18.70 18.48 18.56 18.37
C2-P07 14.16 13.74 13.61 12.91 12.90 15.70 15.76 15.16 14.87 14.91 14.84
C2-P08 22.90 22.96 22.81 22.81 22.61 22.43 22.50 22.57 22.37 22.50 22.30
C2-P09 23.24 23.05 22.92 22.89 22.75 22.50 22.25 22.30 22.10 22.29 22.13
C2-P10 27.80 27.40 27.16 26.90 26.89 26.04 26.05 25.26 25.13 25.82 25.47
C2-P11 25.28 25.10 24.73 24.29 24.25 23.76 23.78 23.13 22.84 23.21 23.22
C2-P12 25.58 25.65 25.29 24.81 24.57 27.13 27.02 26.56 26.00 26.77 26.80
C2-P13 20.69 20.66 20.52 20.52 20.30 20.05 20.14 20.13 19.98 20.13 19.97
C2-P14 22.21 21.96 21.79 21.79 21.70 23.75 23.60 23.49 23.31 23.58 23.46
C2-P15 20.54 20.10 20.10 19.99 20.00 22.00 22.06 21.90 21.58 21.79 21 .72
C2-P16 19.59 19.50 19.31 19.26 19.24 18.86 19.01 18.96 18.69 18.78 18.75
C2-P17 22.31 22.34 22.21 22.22 22.10 21.92 22.08 22.12 21.95 22.11 21.96
C2-P18 18.10 18.11 18.01 17.95 17.86 17.70 17.90 17.88 17.82 17.97 17.77
C2-P19 10.55 10.70 10.71 10.82 10.84 10.80 11.08 11.25 11.15 11.20 11.18
C2-P20 16.59 16.61 16.53 16.51 16.40 16.32 16.45 16.49 16.33 16.46 16.35
C2-P21 14.46 14.60 14.33 14.46 14.34 14.08 14.43 14.46 14.33 14.51 14.28
C2-P22 12.18 12.29 12.15 12.25 12.22 12.06 12.46 12.32 12.31 12.44 12.35
C2-P23 9.77 9.86 9.79 9.84 9.85 9.72 10.04 10.14 10.07 9.93 9.98
Energy Fuels Resources (USA) Inc. White Mesa Mill Cell 2 Standpipe Piezometers (ft.
Piezometer 11/4/2016 11/11/2016 11/18/2016 11/25/2016 12/2/2016 12/8/2016 12/13/2016 12/20/2016 12/30/2016 1/6/2017 1/11/2017
C2-P01 12.81 12.77 12.91 13.02 12.75 13.10 13.00 13.32 13.23 13.32 13.05
C2-P02 11.92 11.90 12.00 12.09 11.88 12.21 12.08 12.49 12.36 12.41 12.15
C2-P03 16.06 16.02 16.16 16.22 15.95 16.27 16.15 16.46 16.32 16.41 16.12
C2-P04 12.95 12.91 12.96 13.08 12.88 13.14 13.01 13.35 13.25 13.10 12.98
C2-P05 17.30 17.22 17.42 17.40 17.20 17.43 17.30 17.48 17.33 17.51 17.19
C2-P06 18.54 18.44 18.57 18.57 18.32 18.58 18.39 18.65 18.44 18.50 18.17
C2-P07 14.96 14.95 15.01 15.05 14.90 15.10 14.97 15.20 15.09 15.03 15.04
C2-P08 22.49 22.38 22.52 22.56 22.28 22.61 22.33 22.64 22.40 22.47 22.12
C2-P09 22.30 22.19 22.40 22.28 21.87 21.90 21.80 22.18 21.95 22.09 21.75
C2-P10 25.66 25.62 25.78 25.44 24.70 25.10 25.10 24.95 24.79 24.78 24.53
C2-P11 23.40 23.41 23.36 23.45 23.08 23.18 23.27 23.71 23.71 23.56 23.65
C2-P12 27.05 27.05 27.06 26.83 25.94 26.24 26.61 27.39 27.47 27.32 27.30
C2-P13 20.14 20.08 20.16 20.23 19.91 20.20 20.02 20.17 20.19 20.16 19.87
C2-P14 23.64 23.50 23.48 23.28 22.78 22.93 22.82 23.01 22.76 22.89 22.54
C2-P15 21.93 21.75 21.85 21.79 21.50 21.78 21.70 22.02 21.74 21.84 21.57
C2-P16 18.96 18.14 18.53 18.57 18.31 18.56 18.48 18.59 18.35 18.42 18.19
C2-P17 22.07 22.00 22.13 22.10 21.71 22.07 21.88 22.21 21.94 22.05 21.65
C2-P18 17.90 17.75 17.55 17.78 17.44 17.74 17.55 17.78 17.61 17.58 17.27
C2-P19 14.31 14.16 14.06 14.15 13.93 14.23 14.08 14.08 13.89 13.99 13.68
C2-P20 19.20 19.19 19.27 19.30 19.00 19.22 19.10 19.31 19.10 19.15 18.85
C2-P21 14.31 14.29 14.36 14.48 13.98 19.69 19.47 19.73 18.54 19.11 18.73
C2-P22 12.31 12.28 12.38 12.44 12.02 18.38 18.06 18.32 18.15 17.66 17.14
C2-P23 10.25 9.79 9.35 9.33 9.20 9.44 9.37 13.89 14.40 14.29 14.20
-.. .
Piezometer 1/20/2017 1/27/2017 2/3/2017 2/17/2017 2/22/2017 3/3/2017 3/10/2017 3/17/2017 3/24/2017 3/31/2017 4/7/2017 4/14/2017
C2-P01 13.06 13.72 13.48 13.34 13.42 13.80 13.73 13.75 13.66 13.33 13.68 13.55
C2-P02 12.13 12.85 12.63 12.51 12.64 13.05 12.97 12.99 12.86 12.58 12.99 12.86
C2-P03 16.13 16.80 16.53 16.35 16.40 16.79 16.70 16.75 16.66 16.35 16.70 16.61
C2-P04 12.95 13.50 13.31 13.22 13.37 13.68 13.63 13.61 13.46 13.28 13.69 13.58
C2-P05 17.18 17.72 17.51 17.40 17.41 17.74 17.67 17.73 17.71 17.44 17.73 17.66
C2-P06 18.12 18.76 18.47 18.31 18.43 18.78 18.70 18.70 18.62 18.34 18.72 18.62
C2-P07 14.85 15.27 15.10 15.01 15.13 15.39 15.34 15.34 15.24 15.08 15.40 15.31
C2-P08 22.08 22.82 22.51 22.36 22.50 22.88 22.74 22.77 22.65 22.29 22.74 22.57
C2-P09 21.70 22.29 21.99 21.81 21.85 22.20 22.10 22.13 22.10 21.55 22.00 21.90
C2-P10 24.49 25.01 24.75 24.60 25.12 25.74 25.55 25.08 24.86 24.34 24.88 24.82
C2-P11 23.61 23.64 23.86 23.93 23.95 23.98 24.24 24.25 24.00 23.66 24.20 24.16
C2-P12 27.30 27.79 27.60 27.56 27.72 28.01 27.93 27.91 27.46 26.81 27.83 27.86
C2-P13 19.84 20.55 20.26 20.12 20.24 20.64 20.57 20.58 20.44 20.15 20.88 20.45
C2-P14 22.50 23.09 22.81 22.71 22.80 23.17 23.10 23.15 23.07 22.73 23.10 23.01
C2-P15 21.56 22.10 21.89 21.80 21 .93 22.15 22.20 22.22 22.05 21.79 22.24 22.15
C2-P16 18.19 18.69 18.49 18.42 18.55 18.85 18.80 18.84 18.69 18.43 18.81 18.70
C2-P17 21.58 22.20 21.92 21.77 21 .82 22.19 22.09 22.14 22.09 21.76 22.09 22.00
C2-P18 17.08 17.76 17.51 17.36 17.46 17.90 17.80 17.85 17.69 17.40 17.83 17.65
C2-P19 13.63 14.21 13.92 13.76 13.80 14.13 14.00 14.02 13.95 13.61 13.91 13.79
C2-P20 18.80 19.35 19.10 18.97 18.94 19.35 19.25 19.32 19.28 19.00 19.25 19.60
C2-P21 18.64 19.37 19.06 18.98 19.03 19.52 19.45 19.51 19.43 19.13 19.56 19.45
C2-P22 17.00 17.65 17.40 17.33 17.42 17.88 17.83 17.89 17.80 17.55 17.96 17.87
C2-P23 13.35 13.75 13.63 13.63 13.80 14.07 14.04 14.00 13.86 13.82 14.15 13.96
~nergy l"'ue1s Hesources tU~AJ inc. wnne Mesa MIii \,;ell.! ~tana pipe 1-'1ezometers tn,J
Piezometer 4/20/2017 4/27/2017 5/2/2017 5/12/2017 5/19/2017 5/25/2017 5/31/2017 6/8/2017 6/16/2017 6/23/2017 6/30/2017 7/6/2017 -
C2-P01 13.62 13.37 13.57 13.59 13.60 13.61 13.50 13.48 13.48 13.41 13.35 13.43
C2-P02 12.96 12.71 12.95 12.98 13.02 13.04 12.95 12.95 12.96 12.90 12.88 12.97
C2-P03 16.68 16.46 16.69 16.74 16.78 16.79 16.71 16.73 16.78 16.74 16.70 16.82
C2-P04 13.73 13.50 13.74 13.76 13.79 13.81 13.81 13.81 13.82 13.76 13.77 13.86
C2-P05 17.70 17.55 17.72 17.81 17.85 17.91 17.76 17.80 17.88 17.89 17.88 18.00
C2-P06 18.70 18.50 18.73 18.85 18.83 18.85 18.77 18.80 18.90 18.83 18.83 18.94
C2-P07 15.42 15.27 15.46 15.50 15.52 15.55 15.56 15.58 15.60 15.56 15.59 15.66
C2-P08 22.67 22.47 22.70 22.80 22.82 22.80 22.72 22.77 22.84 22.83 22.80 22.95
C2-P09 22.05 21.85 22.05 22.10 22.19 22.20 22.10 22.11 22.20 22.22 22.03 22.20
C2-P10 24.93 24.76 24.96 25.00 25.02 25.03 25.00 25.03 25.07 24.96 24.72 25.01
C2-P11 24.25 24.10 24.30 24.99 24.31 24.32 24.38 24.37 24.41 24.24 24.00 24.26
C2-P12 28.03 27.90 28.15 28.17 28.24 28.24 28.31 28.32 28.40 28.03 27.60 28.18
C2-P13 20.57 20.35 20.59 20.63 20.67 20.73 20.63 20.65 20.66 20.67 20.62 20.72
C2-P14 22.91 22.75 22.96 23.00 23.09 23.15 23.04 23.07 23.15 23.11 23.01 23.18
C2-P15 21.86 21.78 21.98 22.01 22.11 22.13 22.10 22.12 22.19 22.07 22.05 22.21
C2-P16 21.21 21.28 21.49 21.56 21.65 21.74 21 .65 21.69 21.75 21.66 21.65 21.79
C2-P17 22.03 21.93 22.05 22.08 22.12 22.14 22.02 22.03 22.11 22.08 22.05 22.17
C2-P18 17.74 17.47 17.75 17.77 17.80 17.86 17.77 17.77 17.82 17.78 17.84 17.90
C2-P19 15.62 15.40 15.53 15.53 15.50 15.58 15.37 15.34 15.40 15.35 15.32 15.40
C2-P20 19.20 19.00 19.20 19.44 22.00 21.96 21.94 21.93 22.01 21.99 21.94 22.07
C2-P21 19.54 19.30 19.61 19.64 19.70 19.72 19.70 19.71 19.82 19.79 19.86 19.95
C2-P22 17.98 17.75 18.03 18.10 18.14 18.18 18.12 18.15 18.23 18.20 18.20 18.34
C2-P23 13.86 13.65 13.82 14.02 14.81 14.83 13.92 13.92 13.95 13.91 13.92 14.03
' -, --,.--..---,---,
Piezometer 7/14/2017 7/28/2017 8/4/2017 9/1/2017 10/13/2017 11/10/2017 12/6/2017 1/10/2018 2/1/2018 3/16/2018 4/5/2018 5/11/2018
C2-P01 13.32 13.12 13.07 12.96 13.00 13.08 13.49 13.45 13.96 14.10 14.28 13.92
C2-P02 12.90 12.74 12.70 12.59 12.58 12.58 12.92 12.77 13.30 13.45 13.70 13.45
C2-P03 16.75 16.60 16.57 16.27 16.34 16.36 16.73 16.60 17.13 17.34 17.56 17.35
C2-P04 13.85 13.75 13.74 13.65 13.69 13.70 14.05 13.89 14.29 14.44 14.76 14.56
C2-P05 17.95 17.87 17.85 17.71 17.67 17.61 17.87 17.75 18.14 18.33 18.51 18.41
C2-P06 18.90 18.81 18.79 18.77 18.75 18.66 18.93 18.62 19.06 19.22 19.49 19.36
C2-P07 15.66 15.60 15.60 15.60 15.67 15.73 15.97 15.78 16.12 16.26 16.53 16.42
C2-P08 22.89 22.80 22.79 22.72 22.56 22.42 22.66 23.50 22.82 22.97 23.21 23.05
C2-P09 22.21 22.19 22.17 22.17 22.10 22.00 22.15 21.83 22.29 22.17 22.41 22.39
C2-P10 25.07 25.06 25.04 25.05 25.00 24.90 25.09 24.77 25.10 25.19 25.30 25.30
C2-P11 24.30 24.32 24.33 24.32 24.25 24.20 24.34 24.24 24.46 24.54 24.63 24.75
C2-P12 28.37 28.45 28.49 28.51 28.55 28.33 28.70 28.52 28.76 28.85 28.79 29.06
C2-P13 20.68 20.64 20.56 20.48 20.38 20.26 20.48 20.51 20.62 20.75 21.02 20.86
C2-P14 23.17 23.12 23.10 23.11 23.04 22.90 23.15 22.92 23.32 23.52 23.63 23.55
C2-P15 22.12 22.16 22.15 22.16 22.13 21.95 22.27 22.02 22.41 22.56 22.72 22.67
C2-P16 21.79 21.76 21.75 21.76 21 .73 21.63 21.89 21.71 22.05 22.22 22.37 22.34
C2-P17 22.09 21.94 21.90 21.78 21.63 21.42 21.62 21.32 21.79 21.95 22.17 22.05
C2-P18 17.83 17.70 17.68 17.55 17.40 17.20 17.38 17.06 17.52 17.71 18.03 17.93
C2-P19 15.31 15.18 15.14 15.10 15.10 15.08 15.37 15.14 15.61 15.80 16.00 15.79
C2-P20 22.00 21.85 21.84 21.69 21.55 21.33 21.49 21.23 21.61 21.79 21.98 21.91
C2-P21 19.90 19.76 19.75 19.65 19.52 19.33 19.56 19.21 19.70 19.88 20.18 20.07
C2-P22 18.30 18.19 18.18 18.14 18.10 17.99 18.25 17.56 18.43 18.61 18.88 18.78
C2-P23 13.98 13.97 13.99 13.93 13.91 13.98 14.14 14.21 14.47 14.70 14.92 15.09
-' . .. ' -
I
Piezometer 6/14/2018 7/11/2018 8/2/2018 9/6/2018 10/1/2018 11/5/2018 12/4/2018 1/8/2019 2/1/2019 3/20/2019 4/4/2019 5/6/2019 6/5/2019
C2-P01 13.89 13.63 13.42 13.43 13.29 13.32 13.99 14.45 14.40 16.78 13.53 12.78 12.50
C2-P02 13.54 13.39 13.11 13.19 12.99 12.88 13.44 13.83 13.79 13.97 13.57 12.71 12.33
C2-P03 17.45 17.33 16.53 16.56 16.41 16.26 16.82 17.22 17.08 16.51 16.06 15.65 15.64
C2-P04 14.70 14.62 14.48 14.53 14.41 14.33 14.83 15.10 15.10 14.85 14.06 13.36 13.31
C2-P05 18.60 18.55 18.54 18.68 18.57 18.45 18.83 19.02 18.95 18.93 18.61 18.24 18.29
C2-P06 19.61 19.58 19.58 19.72 19.59 19.45 19.89 20.05 19.94 20.17 19.95 19.59 19.52
C2-P07 16.75 16.60 16.53 16.61 16.51 16.46 16.85 17.01 16.94 16.77 16.55 16.41 16.44
C2-P08 23.32 23.27 23.28 23.49 23.29 23.09 23.54 23.71 23.57 23.82 23.70 23.33 23.33
C2-P09 22.62 22.45 22.56 22.74 22.52 22.39 22.71 22.91 22.78 22.95 23.00 22.90 22.91
C2-P10 25.59 25.44 25.53 25.69 25.44 25.37 25.78 25.50 25.72 25.89 25.92 25.90 26.00
C2-P11 24.98 24.82 24.89 25.00 25.18 24.78 25.01 25.12 25.15 25.31 25.30 25.39 25.47
C2-P12 29.39 28.99 29.12 29.35 29.40 28.98 29.29 29.43 29.36 29.54 29.53 29.59 29.67
C2-P13 21.12 21.08 21.00 21.08 20.85 20.62 21.05 21.27 21.15 21.47 21.31 20.98 21.09
C2-P14 23.81 23.67 23.75 23.90 24.09 23.49 23.94 24.12 23.99 25.15 24.14 24.01 24.03
C2-P15 22.92 22.80 22.81 22.97 23.18 22.55 22.99 23.15 23.01 23.43 23.22 23.12 23.19
C2-P16 22.57 22.45 22.43 22.62 22.38 22.19 22.64 22.78 22.62 22.78 22.76 22.68 22.76
C2-P17 22.25 22.19 22.20 22.21 21.98 21.73 22.10 22.39 23.25 22.71 22.64 22.51 22.56
C2-P18 18.22 18.22 18.14 18.19 17.92 17.63 17.99 18.28 18.18 18.71 18.72 18.72 18.95
C2-P19 15.82 15.83 15.82 15.92 15.81 15.77 16.34 16.60 16.50 16.10 15.96 15.90 16.01
C2-P20 22.10 22.08 22.07 22.09 21.85 21 .6 21.93 22.19 22.13 22.55 22.60 22.57 22.71
C2-P21 20.31 20.32 20.32 20.37 20.11 19.84 20.24 20.53 20.38 20.88 20.83 20.84 21.01
C2-P22 19.06 19.07 18.94 19.16 18.92 18.71 19.12 19.41 19.31 19.72 19.65 19.65 19.79
C2-P23 15.19 15.29 15.18 15.18 15.11 15.04 15.18 15.45 15.57 15.91 15.84 15.82 15.89
t:nergy t-ue1s Hesources (U::SA) inc. wnne Mesa MIii c;en 2 ::stand :,1pe P1ezometers (tt.)
I
Piezometer 7/3/2019 Bn/2019 9/5/2019 10/2/2019 11ll/2019 12/4/2019 1/3/2020 2/14/2020 3/3/2020 4/1/2020 5/1/2020 6/2/2020
C2-P01 12.02 11.78 12.01 11.96 12.52 12.77 13.33 13.32 13.52 13.65 13.42 13.19
C2-P02 11.88 11.61 11.68 11.53 11.92 12.07 12.56 12.57 12.79 13.11 13.30 12.96
C2-P03 15.37 15.19 15.16 15.16 15.42 15.47 15.97 15.97 16.17 16.48 16.39 16.34
C2-P04 13.04 13.00 13.07 13.01 13.39 13.60 13.87 13.85 13.99 14.21 14.01 14.10
C2-P05 18.21 18.17 18.20 18.15 18.16 18.05 18.44 18.44 18.54 18.79 18.83 18.94
C2-P06 19.25 19.13 19.13 18.97 18.97 18.93 19.28 19.26 19.36 19.71 19.65 19.84
C2-P07 16.21 16.11 16.06 15.89 16.02 16.13 16.32 16.33 16.52 16.80 16.74 16.81
C2-P08 23.17 23.15 23.19 23.09 23.06 22.93 23.25 23.26 23.29 23.60 23.62 23.82
C2-P09 22.78 22.72 22.74 22.61 22.64 22.24 22.60 22.60 22.40 22.71 22.69 22.85
C2-P10 25.87 25.89 25.89 25.69 25.70 25.54 25.74 25.75 25.57 26.02 25.95 26.13
C2-P11 25.35 25.35 25.29 24.96 25.10 25.05 24.95 24.96 25.10 25.61 25.64 25.75
C2-P12 29.55 29.57 29.56 29.16 29.32 29.06 29.26 29.27 28.90 29.64 29.71 29.82
C2-P13 21.10 21.09 21.05 20.68 20.70 20.58 20.81 20.81 20.99 21.39 21.54 21.70
C2-P14 23.94 23.91 23.92 23.76 23.75 23.53 23.91 23.91 23.85 24.15 24.15 24.35
C2-P15 23.06 23.05 23.07 22.89 22.88 22.73 23.03 23.04 22.99 23.34 23.31 23.50
C2-P16 22.61 22.61 22.62 22.44 22.45 22.30 22.59 22.60 22.59 22.86 22.88 23.05
C2-P17 22.50 22.40 22.36 22.17 22.12 21.91 22.28 22.30 22.38 22.71 22.77 22.96
C2-P18 18.91 18.88 18.85 18.61 18.59 18.42 18.69 18.71 18.93 19.31 19.50 19.78
C2-P19 15.92 15.87 15.96 15.94 16.14 16.11 16.57 16.58 16.68 16.93 16.92 17.02
C2-P20 22.70 22.63 22.59 22.38 22.31 22.06 22.41 22.42 22.50 22.74 22.89 23.06
C2-P21 20.97 20.92 20.90 20.65 20.61 20.36 20.66 20.66 20.75 21.11 21.24 21.45
C2-P22 19.68 19.63 19.59 19.36 19.38 19.25 19.55 19.56 19.68 20.02 20.10 20.32
C2-P23 15.85 15.76 15.67 15.39 15.58 15.64 15.72 15.74 16.18 16.40 16.62 16.74
-· -------ell 2 Standpipe Piezometers (ft.) -
I
Piezometer 7/14/2020 8/5/2020 9/2/2020 10/1/2020 11/2/2020 12/2/2020
C2-P01 12.65 12.48 12.45 12.61 12.99 13.27
C2-P02 12.50 12.33 12.24 12.33 12.58 12.71
C2-P03 16.00 15.88 15.83 15.91 16.11 16.25
C2-P04 13.78 13.80 13.84 14.00 14.34 14.37
C2-P05 18.86 18.81 18.81 18.79 18.78 18.82
C2-P06 19.63 19.59 19.58 19.56 19.67 19.63
C2-P07 16.60 16.56 16.54 16.56 16.75 16.71
C2-P08 23.68 23.68 23.70 23.70 23.70 23.61
C2-P09 22.79 22.77 22.80 22.73 22.75 22.63
C2-P10 26.02 26.02 26.05 25.97 26.10 25.81
C2-P11 25.63 25.62 25.60 25.50 25.60 25.24
C2-P12 29.70 29.65 29.62 29.54 29.74 29.21
C2-P13 21.57 21.54 21.40 21.43 21.35 21 .23
C2-P14 24.21 24.18 24.20 24.15 24.21 24.11
C2-P15 23.34 23.32 23.31 23.32 23.43 23.47
C2-P16 22.90 22.91 22.91 22.95 23.10 22.96
C2-P17 22.81 22.78 22.73 22.64 22.60 22.55
C2-P18 19.70 19.64 19.58 19.61 19.55 19.48
C2-P19 16.84 16.79 16.86 16.94 17.13 17.21
C2-P20 22.97 22.90 22.82 22.78 22.70 22.66
C2-P21 21.34 21.29 21.23 21.17 21.15 21.04
C2-P22 20.19 20.11 20.09 20.06 20.13 20.02
C2-P23 16.71 16.65 16.58 16.63 16.70 16.70
-· . , .. ,----'
Piezometer 6/16/2016 6/22/2016 6/30/2016 1n12016 7/14/2016 7/22/2016 7/28/2016 8/5/2016 8/11/2016
C2-P01 5611.05 5611.17 5611.29 5611.34 5611.29 5611.38 5611.50 5611.57 5611.51
C2-P02 5610.90 5610.94 5610.92 5611.09 5611.15 5611.34 5611.44 5611.52 5611.45
C2-P03 5610.04 5610.26 5610.36 5610.61 5610.56 5610.55 5610.72 5611.02 5611.05
C2-P04 5610.84 5610.93 5610.97 5611.09 5611 .05 5611.13 5611.51 5611 .61 5611.59
C2-P05 5606.50 5606.59 5606.65 5606.74 5606.81 5606.81 5606.90 5607.17 5607.23
C2-P06 5606.51 5606.58 5606.71 5606.74 5606.77 5606.91 5607.07 5607.16 5607.12
C2-P07 5606.53 5606.67 5606.65 5606.72 5606.71 5606.74 5607.44 5607.51 5607.44
C2-P08 5603.71 5603.84 5603.86 5603.92 5603.94 5603.95 5604.10 5604.21 5604.07
C2-P09 5599.31 5600.80 5600.70 5600.74 5600.65 5600.85 5600.96 5601.06 5600.97
C2-P10 5598.44 5599.00 5598.31 5598.13 5597.97 5597.85 5598.15 5598.19 5598.01
C2-P11 5599.55 5599.81 5599.48 5599.47 5599.35 5599.34 5599.91 5599.95 5599.87
C2-P12 5595.99 5597.39 5596.50 5596.34 5596.14 5596.05 5596.22 5596.63 5596.50
C2-P13 5603.71 5603.73 5603.84 5604.01 5604.08 5604.09 5604.26 5604.42 5604.46
C2-P14 5601.28 5601.57 5601 .53 5601.48 5601 .38 5601.53 5601.73 5601.75 5601.67
C2-P15 5601.80 5602.00 5601.97 5602.01 5601.96 5602.09 5602.37 5602.42 5602.65
C2-P16 5602.27 5602.50 5602.45 5602.49 5602.41 5602.49 5602.71 5602.80 5602.73
C2-P17 5606.06 5606.20 5606.17 5606.32 5606.30 5606.32 5606.47 5606.60 5606.52
C2-P18 5606.20 5606.25 5606.28 5606.38 5606.33 5606.32 5606.52 5606.64 5606.59
C2-P19 5609.06 5609.09 5609.06 5609.02 5608.87 5608.80 5608.87 5608.87 5608.72
C2-P20 5609.43 5609.48 5609.56 5609.61 5609.60 5609.61 5609.76 5609.86 5609.83
C2-P21 5610.72 5610.80 5610.81 5610.92 5610.86 5610.83 5611.00 5611.10 5611.03
C2-P22 5611.77 5611.85 5611.77 5611.89 5611.79 5611.71 5611.87 5611.96 5611.85
C2-P23 5612.29 5612.46 5612.48 5612.57 5612.49 5612.37 5612.44 5612.50 5612.46
-. ,
I I
Piezometer 8/19/2016 8/26/2016 9/2/2016 9/9/2016 9/16/2016 9/23/2016 . 9/30/2016 10n12016 10/13/2016 10/21/2016 10/28/2016
C2-P01 5611.65 5611.70 5611.94 5611.96 5612.00 5612.38 5612.44 5612.42 5612.55 5612.37 5612.49
C2-P02 5611.86 5612.08 5612.46 5612.43 5612.58 5612.80 5613.19 5613.21 5613.30 5613.09 5613.17
C2-P03 5611.52 5611.54 5611.54 5611.54 5611.98 5612.30 5612.27 5612.19 5612.31 5612.16 5612.29
C2-P04 5611.73 5612.04 5612.33 5612.78 5612.87 5613.18 5613.20 5613.65 5613.91 5613.84 5613.97
C2-P05 5607.59 5607.64 5607.71 5607.71 5608.04 5608.10 5608.29 5608.19 5608.34 5608.24 5608.39
C2-P06 5607.69 5607.73 5607.98 5608.04 5608.33 5608.51 5608.61 5608.63 5608.85 5608.77 5608.96
C2-P07 5607.58 5608.00 5608.13 5608.83 5608.84 5609.22 5609.16 5609.76 5610.05 5610.01 5610.08
C2-P08 5604.43 5604.37 5604.52 5604.52 5604.72 5604.90 5604.83 5604.76 5604.96 5604.83 5605.03
C2-P09 5601.25 5601.44 5601.57 5601.60 5601.74 5601.99 5602.24 5602.19 5602.39 5602.20 5602.36
C2-P10 5598.08 5598.48 5598.72 5598.98 5598.99 5599.84 5599.83 5600.62 5600.75 5600.06 5600.41
C2-P11 5599.94 5600.12 5600.49 5600.93 5600.97 5601.46 5601.44 5602.09 5602.38 5602.01 5602.00
C2-P12 5596.53 5596.46 5596.82 5597.30 5597.54 5598.26 5598.37 5598.83 5599.39 5598.62 5598.59
C2-P13 5604.87 5604.90 5605.04 5605.04 5605.26 5605.51 5605.42 5605.43 5605.58 5605.43 5605.59
C2-P14 5601.92 5602.17 5602.34 5602.34 5602.43 5602.74 5602.89 5603.00 5603.18 5602.91 5603.03
C2-P15 5602.62 5603.06 5603.06 5603.17 5603.16 5603.51 5603.45 5603.61 5603.93 5603.72 5603.79
C2-P16 5602.92 5603.01 5603.20 5603.25 5603.27 5603.65 5603.50 5603.55 5603.82 5603.73 5603.76
C2-P17 5606.76 5606.73 5606.86 5606.85 5606.97 5607.15 5606.99 5606.95 5607.12 5606.96 5607.11
C2-P18 5606.80 5606.79 5606.89 5606.95 5607.04 5607.20 5607.00 5607.02 5607.08 5606.93 5607.13
C2-P19 5608.82 5608.67 5608.66 5608.55 5608.53 5608.57 5608.29 5608.12 5608.22 5608.17 5608.19
C2-P20 5609.99 5609.97 5610.05 5610.07 5610.18 5610.26 5610.13 5610.09 5610.25 5610.12 5610.23
C2-P21 5611.22 5611.08 5611.35 5611.22 5611.34 5611.60 5611.25 5611.22 5611 .35 5611.17 5611.40
C2-P22 5612.01 5611.90 5612.04 5611.94 5611.97 5612.13 5611.73 5611.87 5611.88 5611.75 5611.84
C2-P23 5612.45 5612.36 5612.43 5612.38 5612.37 5612.50 5612.18 5612.08 5612.15 5612.29 5612.24
t:ner y t-ue1s Hesources {USA) Inc. White Mesa Mill ce112 Standpipe Piezometers Water Surface Elevation (ft amsl)
I
Piezometer 11/4/2016 11/11/2016 11/18/2016 11/25/2016 12/2/2016 12/8/2016 12/13/2016 12/20/2016 12/30/2016 1/6/2017 1/11/2017
C2-P01 5612.27 5612.31 5612.17 5612.06 5612.33 5611.98 5612.08 5611.76 5611.85 5611.76 5612.03
C2-P02 5612.96 5612.98 5612.88 5612.79 5613.00 5612.67 5612.80 5612.39 5612.52 5612.47 5612.73
C2-P03 5612.10 5612.14 5612.00 5611.94 5612.21 5611.89 5612.01 5611.70 5611.84 5611.75 5612.04
C2-P04 5613.80 5613.84 5613.79 5613.67 5613.87 5613.61 5613.74 5613.40 5613.50 5613.65 5613.77
C2-P05 5608.24 5608.32 5608.12 5608.14 5608.34 5608.11 5608.24 5608.06 5608.21 5608.03 5608.35
C2-P06 5608.79 5608.89 5608.76 5608.76 5609.01 5608.75 5608.94 5608.68 5608.89 5608.83 5609.16
C2-P07 5609.96 5609.97 5609.91 5609.87 5610.02 5609.82 5609.95 5609.72 5609.83 5609.89 5609.88
C2-P08 5604.84 5604.95 5604.81 5604.77 5605.05 5604.72 5605.00 5604.69 5604.93 5604.86 5605.21
C2-P09 5602.19 5602.30 5602.09 5602.21 5602.62 5602.59 5602.69 5602.31 5602.54 5602.40 5602.74
C2-P10 5600.22 5600.26 5600.10 5600.44 5601.18 5600.78 5600.78 5600.93 5601.09 5601.10 5601.35
C2-P11 5601.82 5601.81 5601.86 5601.77 5602.14 5602.04 5601.95 5601.51 5601.51 5601.66 5601.57
C2-P12 5598.34 5598.34 5598.33 5598.56 5599.45 5599.15 5598.78 5598.00 5597.92 5598.07 5598.09
C2-P13 5605.42 5605.48 5605.40 5605.33 5605.65 5605.36 5605.54 5605.39 5605.37 5605.40 5605.69
C2-P14 5602.85 5602.99 5603.01 5603.21 5603.71 5603.56 5603.67 5603.48 5603.73 5603.60 5603.95
C2-P15 5603.58 5603.76 5603.66 5603.72 5604.01 5603.73 5603.81 5603.49 5603.77 5603.67 5603.94
C2-P16 5603.55 5604.37 5603.98 5603.94 5604.20 5603.95 5604.03 5603.92 5604.16 5604.09 5604.32
C2-P17 5607.00 5607.07 5606.94 5606.97 5607.36 5607.00 5607.19 5606.86 5607.13 5607.02 5607.42
C2-P18 5607.00 5607.15 5607.35 5607.12 5607.46 5607.16 5607.35 5607.12 5607.29 5607.32 5607.63
C2-P19 5607.92 5608.07 5608.17 5608.08 5608.30 5608.00 5608.15 5608.15 5608.34 5608.24 5608.55
C2-P20 5610.23 5610.24 5610.16 5610.13 5610.43 5610.21 5610.33 5610.12 5610.33 5610.28 5610.58
C2-P21 5611.37 5611.39 5611.32 5611.20 5611.70 5611.25 5611.47 5611.21 5612.40 5611.83 5612.21
C2-P22 5611.88 5611.91 5611.81 5611.75 5612.17 5612.01 5612.33 5612.07 5612.24 5612.73 5613.25
C2-P23 5611.97 5612.43 5612.87 5612.89 5613.02 5612.78 5612.85 5613.70 5613.19 5613.30 5613.39
. . . --' , .
I I
Piezometer 1/20/2017 1/27/2017 2/3/2017 2/17/2017 2/22/2017 3/3/2017 3/10/2017 3/17/2017 3/24/2017 3/31/2017 4/7/2017 4/14/2017
C2-P01 5612.02 5611.36 5611.60 5611.74 5611 .66 5611.28 5611.35 5611.33 5611.42 5611.75 5611.40 5611.53
C2-P02 5612.75 5612.03 5612.25 5612.37 5612.24 5611.83 5611.91 5611.89 5612.02 5612.30 5611.89 5612.02
C2-P03 5612.03 5611.36 5611.63 5611.81 5611.76 5611.37 5611.46 5611.41 5611.50 5611.81 5611.46 5611.55
C2-P04 5613.80 5613.25 5613.44 5613.53 5613.38 5613.07 5613.12 5613.14 5613.29 5613.47 5613.06 5613.17
C2-P05 5608.36 5607.82 5608.03 5608.14 5608.13 5607.80 5607.87 5607.81 5607.83 5608.10 5607.81 5607.88
C2-P06 5609.21 5608.57 5608.86 5609.02 5608.90 5608.55 5608.63 5608.63 5608.71 5608.99 5608.61 5608.71
C2-P07 5610.07 5609.65 5609.82 5609.91 5609.79 5609.53 5609.58 5609.58 5609.68 5609.84 5609.52 5609.61
C2-P08 5605.25 5604.51 5604.82 5604.97 5604.83 5604.45 5604.59 5604.56 5604.68 5605.04 5604.59 5604.76
C2-P09 5602.79 5602.20 5602.50 5602.68 5602.64 5602.29 5602.39 5602.36 5602.39 5602.94 5602.49 5602.59
C2-P10 5601 .39 5600.87 5601.13 5601.28 5600.76 5600.14 5600.33 5600.80 5601.02 5601.54 5601.00 5601 .06
C2-P11 5601.61 5601.58 5601.36 5601.29 5601.27 5601.24 5600.98 5600.97 5601.22 5601.56 5601.02 5601.06
C2-P12 5598.09 5597.60 5597.79 5597.83 5597.67 5597.38 5597.46 5597.48 5597.93 5598.58 5597.56 5597.53
C2-P13 5605.72 5605.01 5605.30 5605.44 5605.32 5604.92 5604.99 5604.98 5605.12 5605.41 5604.68 5605.11
C2-P14 5603.99 5603.40 5603.68 5603.78 5603.69 5603.32 5603.39 5603.34 5603.42 5603.76 5603.39 5603.48
C2-P15 5603.95 5603.41 5603.62 5603.71 5603.58 5603.36 5603.31 5603.29 5603.46 5603.72 5603.27 5603.36
C2-P16 5604.32 5603.82 5604.02 5604.09 5603.96 5603.66 5603.71 5603.67 5603.82 5604.08 5603.70 5603.81
C2-P17 5607.49 5606.87 5607.15 5607.30 5607.25 5606.88 5606.98 5606.93 5606.98 5607.31 5606.98 5607.07
C2-P18 5607.82 5607.14 5607.39 5607.54 5607.44 5607.00 5607.10 5607.05 5607.21 5607.50 5607.07 5607.25
C2-P19 5608.60 5608.02 5608.31 5608.47 5608.43 5608.10 5608.23 5608.21 5608.28 5608.62 5608.32 5608.44
C2-P20 5610.63 5610.08 5610.33 5610.46 5610.49 5610.08 5610.18 5610.11 5610.15 5610.43 5610.18 5609.83
C2-P21 5612.30 5611.57 5611.88 5611.96 5611.91 5611.42 561 f.49 5611.43 5611.51 5611.81 5611.38 5611.49
C2-P22 5613.39 5612.74 5612.99 5613.06 5612.97 5612.51 5612.56 5612.50 5612.59 5612.84 5612.43 5612.52
C2-P23 5614.24 5613.84 5613.96 5613.96 5613.79 5613.52 5613.55 5613.59 5613.73 5613.77 5613.44 5613.63
I
Piezometer
C2-P01
C2-P02
C2-P03
C2-P04
C2-P05
C2-P06
C2-P07
C2-P08
C2-P09
C2-P10
C2-P11
C2-P12
C2-P13
C2-P14
C2-P15
C2-P16
C2-P17
C2-P18
C2-P19
C2-P20
C2-P21
C2-P22
C2-P23
E Fuels R {USA) Inc. White Mesa Mill C Stand · -..
I
4/20/2017 4/27/2017 5/2/2017 5/12/2017 5/19/2017 5/25/2017 5/31/2017 6/8/2017
5611.46 5611.71 5611.51 5611.49 5611.48 5611.47 5611.58 5611.60
5611.92 5612.17 5611.93 5611.90 5611.86 5611.84 5611.93 5611.93
5611.48 5611.70 5611.47 5611.42 5611.38 5611.37 5611.45 5611.43
5613.02 5613.25 5613.01 5612.99 5612.96 5612.94 5612.94 5612.94
5607.84 5607.99 5607.82 5607.73 5607.69 5607.63 5607.78 5607.74
5608.63 5608.83 5608.60 5608.48 5608.50 5608.48 5608.56 5608.53
5609.50 5609.65 5609.46 5609.42 5609.40 5609.37 5609.36 5609.34
5604.66 5604.86 5604.63 5604.53 5604.51 5604.53 5604.61 5604.56
5602.44 5602.64 5602.44 5602.39 5602.30 5602.29 5602.39 5602.38
5600.95 5601.12 5600.92 5600.88 5600.86 5600.85 5600.88 5600.85
5600.97 5601.12 5600.92 5600.23 5600.91 5600.90 5600.84 5600.85
5597.36 5597.49 5597.24 5597.22 5597.15 5597.15 5597.08 5597.07
5604.99 5605.21 5604.97 5604.93 5604.89 5604.83 5604.93 5604.91
5603.58 5603.74 5603.53 5603.49 5603.40 5603.34 5603.45 5603.42
5603.65 5603.73 5603.53 5603.50 5603.40 5603.38 5603.41 5603.39
5604.33 5604.26 5604.05 5603.98 5603.89 5603.80 5603.89 5603.85
5607.04 5607.14 5607.02 5606.99 5606.95 5606.93 5607.05 5607.04
5607.16 5607.43 5607.15 5607.13 5607.10 5607.04 5607.13 5607.13
5608.80 5609.02 5608.89 5608.89 5608.92 5608.84 5609.05 5609.08
5610.23 5610.43 5610.23 5609.99 5610.04 5610.08 5610.10 5610.11
5611.40 5611.64 5611.33 5611.30 5611.24 5611.22 5611.24 5611.23
5612.41 5612.64 5612.36 5612.29 5612.25 5612.21 5612.27 5612.24
5613.73 5613.94 5613.77 5613.57 5612.78 5612.76 5613.67 5613.67
* Week of 4/20/17 Piezometer 19 was hit by equipment and then raised and piezometer 16
was raised to keep above cover.
rf .
I;
6/16/2017 6/23/2017 6/30/2017 7/6/2017
5611.60 5611.67 5611.73 5611 .65
5611.92 5611.98 5612.00 5611.91
5611.38 5611.42 5611.46 5611.34
5612.93 5612.99 5612.98 5612.89
5607.66 5607.65 5607.66 5607.54
5608.43 5608.50 5608.50 5608.39
5609.32 5609.36 5609.33 5609.26
5604.49 5604.50 5604.53 5604.38
5602.29 5602.27 5602.46 5602.29
5600.81 5600.92 5601.16 5600.87
5600.81 5600.98 5601.22 5600.96
5596.99 5597.36 5597.79 5597.21
5604.90 5604.89 5604.94 5604.84
5603.34 5603.38 5603.48 5603.31
5603.32 5603.44 5603.46 5603.30
5603.79 5603.88 5603.89 5603.75
5606.96 5606.99 5607.02 5606.90
5607.08 5607.12 5607.06 5607.00
5609.02 5609.07 5609.10 5609.02
5610.03 5610.05 5610.10 5609.97
5611.12 5611.15 5611.08 5610.99
5612.16 5612.19 5612.19 5612.05
5613.64 5613.68 5613.67 5613.56
. . ' '
'
' ' ;
Piezometer 7/14/2017 7/28/2017 8/4/2017 9/1/2017 10/13/2017 11/10/2017 12/6/2017 1/10/2018 2/1/2018 3/16/2018 4/5/2018 5/11/2018
C2-P01 5611.76 5611.96 5612.01 5612.12 5612.08 5612.00 5611.59 5611.63 5611.12 5610.98 5610.80 5611.16
C2-P02 5611.98 5612.14 5612.18 5612.29 5612.30 5612.30 5611.96 5612.11 5611.58 5611.43 5611.18 5611.43
C2-P03 5611.41 5611.56 5611.59 5611.89 5611.82 5611.80 5611.43 5611.56 5611.03 5610.82 5610.60 5610.81
C2-P04 5612.90 5613.00 5613.01 5613.10 5613.06 5613.05 5612.70 5612.86 5612.46 5612.31 5611.99 5612.19
C2-P05 5607.59 5607.67 5607.69 5607.83 5607.87 5607.93 5607.67 5607.79 5607.40 5607.21 5607.03 5607.13
C2-P06 5608.43 5608.52 5608.54 5608.56 5608.58 5608.67 5608.40 5608.71 5608.27 5608.11 5607.84 5607.97
C2-P07 5609.26 5609.32 5609.32 5609.32 5609.25 5609.19 5608.95 5609.14 5608.80 5608.66 5608.39 5608.50
C2-P08 5604.44 5604.53 5604.54 5604.61 5604.77 5604.91 5604.67 5603.83 5604.51 5604.36 5604.12 5604.28
C2-P09 5602.28 5602.30 5602.32 5602.32 5602.39 5602.49 5602.34 5602.66 5602.20 5602.32 5602.08 5602.10
C2-P10 5600.81 5600.82 5600.84 5600.83 5600.88 5600.98 5600.79 5601.11 5600.78 5600.69 5600.58 5600.58
C2-P11 5600.92 5600.90 5600.89 5600.90 5600.97 5601.02 5600.88 5600.98 5600.76 5600.68 5600.59 5600.47
C2-P12 5597.02 5596.94 5596.90 5596.88 5596.84 5597.06 5596.69 5596.87 5596.63 5596.54 5596.60 5596.33
C2-P13 5604.88 5604.92 5605.00 5605.08 5605.18 5605.30 5605.08 5605.05 5604.94 5604.81 5604.54 5604.70
C2-P14 5603.32 5603.37 5603.39 5603.38 5603.45 5603.59 5603.34 5603.57 5603.17 5602.97 5602.86 5602.94
C2-P15 5603.39 5603.35 5603.36 5603.35 5603.38 5603.56 5603.24 5603.49 5603.10 5602.95 5602.79 5602.84
C2-P16 5603.75 5603.78 5603.79 5603.78 5603.81 5603.91 5603.65 5603.83 5603.49 5603.32 5603.17 5603.20
C2-P17 5606.98 5607.13 5607.17 5607.29 5607.44 5607.65 5607.45 5607.75 5607.28 5607.12 5606.90 5607.02
C2-P18 5607.07 5607.20 5607.22 5607.35 5607.50 5607.70 5607.52 5607.84 5607.38 5607.19 5606.87 5606.97
C2-P19 5609.11 5609.24 5609.28 5609.32 5609.32 5609.34 5609.05 5609.28 5608.81 5608.62 5608.42 5608.63
C2-P20 5610.04 5610.19 5610.20 5610.35 5610.49 5610.71 5610.55 5610.81 5610.43 5610.25 5610.06 5610.13
C2-P21 5611.04 5611.18 5611.19 5611.29 5611.42 5611.61 5611.38 5611.73 5611.24 5611.06 5610.76 5610.87
C2-P22 5612.09 5612.20 5612.21 5612.25 5612.29 5612.40 5612.14 5612.83 5611.96 5611.78 5611.51 5611.61
C2-P23 5613.61 5613.62 5613.60 5613.66 5613.68 5613.61 5613.45 5613.38 5613.12 5612.89 5612.67 5612.50
t:.ner IY Fuels Resources (USA) Inc. White Mesa Mill Cell 2 Standpipe Piezometers Water Surface Elevation (ft amsl)
' I
Piezometer 6/14/2018 7/11/2018 8/2/2018 9/6/2018 10/1/2018 11/5/2018 12/4/2018 1/8/2019 2/1/2019 3/20/2019 4/4/2019 5/6/2019 6/5/2019
C2-P01 5611.19 5611.45 5611.66 5611.65 5611.79 5611.76 5611.09 5610.63 5610.68 5608.30 5611.55 5612.30 5612.58
C2-P02 5611.34 5611.49 5611.77 5611.69 5611.89 5612.00 5611.44 5611.05 5611.09 5610.91 5611.31 5612.17 5612.55
C2-P03 5610.71 5610.83 5610.87 5610.84 5610.99 5611.14 5610.58 5610.18 5610.32 5610.89 5611.34 5611.75 5611.76
C2-P04 5612.05 5612.13 5612.27 5612.22 5612.34 5612.42 5611.92 5611.65 5611.65 5611.90 5612.69 5613.39 5613.44
C2-P05 5606.94 5606.99 5607.00 5606.86 5606.97 5607.09 5606.71 5606.52 5606.59 5606.61 5606.93 5607.30 5607.25
C2-P06 5607.72 5607.75 5607.75 5607.61 5607.74 5607.88 5607.44 5607.28 5607.39 5607.16 5607.38 5607.74 5607.81
C2-P07 5608.17 5608.32 5608.39 5608.31 5608.41 5608.46 5608.07 5607.91 5607.98 5608.15 5608.37 5608.51 5608.48
C2-P08 5604.01 5604.06 5604.05 5603.84 5604.04 5604.24 5603.79 5603.62 5603.76 5603.51 5603.63 5604.00 5604.00
C2-P09 5601.87 5602.04 5601.93 5601.75 5601.97 5602.10 5601.78 5601.58 5601.71 5601.54 5601.49 5601.59 5601.58
C2-P10 5600.29 5600.44 5600.35 5600.19 5600.44 5600.51 5600.10 5600.38 5600.16 5599.99 5599.96 5599.98 5599.88
C2-P11 5600.24 5600.40 5600.33 5600.22 5600.04 5600.44 5600.21 5600.10 5600.07 5599.91 5599.92 5599.83 5599.75
C2-P12 5596.00 5596.40 5596.27 5596.04 5595.99 5596.41 5596.10 5595.96 5596.03 5595.85 5595.86 5595.80 5595.72
C2-P13 5604.44 5604.48 5604.56 5604.48 5604.71 5604.94 5604.51 5604.29 5604.41 5604.09 5604.25 5604.58 5604.47
C2-P14 5602.68 5602.82 5602.74 5602.59 5602.40 5603.00 5602.55 5602.37 5602.50 5601.34 5602.35 5602.48 5602.46
C2-P15 5602.59 5602.71 5602.70 5602.54 5602.33 5602.96 5602.52 5602.36 5602.50 5602.08 5602.29 5602.39 5602.32
C2-P16 5602.97 5603.09 5603.11 5602.92 5603.16 5603.35 5602.90 5602.76 5602.92 5602.76 5602.78 5602.86 5602.78
C2-P17 5606.82 5606.88 5606.87 5606.86 5607.09 5607.34 5606.97 5606.68 5605.82 5606.36 5606.43 5606.56 5606.51
C2-P18 5606.68 5606.68 5606.76 5606.71 5606.98 5607.27 5606.91 5606.62 5606.72 5606.19 5606.18 5606.18 5605.95
C2-P19 5608.60 5608.59 5608.60 5608.50 5608.61 5608.65 5608.08 5607.82 5607.92 5608.32 5608.46 5608.52 5608.41
C2-P20 5609.94 5609.96 5609.97 5609.95 5610.19 5610.44 5610.11 5609.85 5609.91 5609.49 5609.44 5609.47 5609.33
C2-P21 5610.63 5610.62 5610.62 5610.57 5610.83 5611.10 5610.70 5610.41 5610.56 5610.06 5610.11 5610.10 5609.93
C2-P22 5611.33 5611.32 5611.45 5611.23 5611.47 5611.68 5611.27 5610.98 5611.08 5610.67 5610.74 5610.74 5610.60
C2-P23 5612.40 5612.30 5612.41 5612.41 5612.48 5612.55 5612.41 5612.14 5612.02 5611.68 5611 .75 5611.77 5611.70
-..
l I
I
Piezometer 7/3/2019 an,2019 9/5/2019 10/2/2019 11n12019 12/4/2019 1/3/2020 2/14/2020 3/3/2020 4/1/2020 5/1/2020 6/2/2020
C2-P01 5613.06 5613.30 5613.07 5613.12 5612.56 5612.31 5611.75 5611.76 5611.56 5611.43 5611.66 5611.89
C2-P02 5613.00 5613.27 5613.20 5613.35 5612.96 5612.81 5612.32 5612.31 5612.09 5611.77 5611.58 5611.92
C2-P03 5612.03 5612.21 5612.24 5612.24 5611.98 5611.93 5611.43 5611.43 5611.23 5610.92 5611.01 5611.06
C2-P04 5613.71 5613.75 5613.68 5613.74 5613.36 5613.15 5612.88 5612.90 5612.76 5612.54 5612.74 5612.65
C2-P05 5607.33 5607.37 5607.34 5607.39 5607.38 5607.49 5607.10 5607.10 5607.00 5606.75 5606.71 5606.60
C2-P06 5608.08 5608.20 5608.20 5608.36 5608.36 5608.40 5608.05 5608.07 5607.97 5607.62 5607.68 5607.49
C2-P07 5608.71 5608.81 5608.86 5609.03 5608.90 5608.79 5608.60 5608.59 5608.40 5608.12 5608.18 5608.11
C2-P08 5604.16 5604.18 5604.14 5604.24 5604.27 5604.40 5604.08 5604.07 5604.04 5603.73 5603.71 5603.51
C2-P09 5601.71 5601.77 5601.75 5601.88 5601.85 5602.25 5601.89 5601.89 5602.09 5601.78 5601.80 5601 .64
C2-P10 5600.01 5599.99 5599.99 5600.19 5600.18 5600.34 5600.14 5600.13 5600.31 5599.86 5599.93 5599.75
C2-P11 5599.87 5599.87 5599.93 5600.26 5600.12 5600.17 5600.27 5600.26 5600.12 5599.61 5599.58 5599.47
C2-P12 5595.84 5595.82 5595.83 5596.23 5596.07 5596.33 5596.13 5596.12 5596.49 5595.75 5595.68 5595.57
C2-P13 5604.46 5604.47 5604.51 5604.88 5604.86 5604.98 5604.75 5604.75 5604.57 5604.17 5604.02 5603.86
C2-P14 5602.55 5602.58 5602.57 5602.73 5602.74 5602.96 5602.58 5602.58 5602.64 5602.34 5602.34 5602.14
C2-P15 5602.45 5602.46 5602.44 5602.62 5602.63 5602.78 5602.48 5602.47 5602.52 5602.17 5602.20 5602.01
C2-P16 5602.93 5602.93 5602.92 5603.10 5603.09 5603.24 5602.95 5602.94 5602.95 5602.68 5602.66 5602.49
C2-P17 5606.57 5606.67 5606.71 5606.90 5606.95 5607.16 5606.79 5606.77 5606.69 5606.36 5606.30 5606.11
C2-P18 5605.99 5606.02 5606.05 5606.29 5606.31 5606.48 5606.21 5606.19 5605.97 5605.59 5605.40 5605.12
C2-P19 5608.50 5608.55 5608.46 5608.48 5608.28 5608.31 5607.85 5607.84 5607.74 5607.49 5607.50 5607.40
C2-P20 5609.34 5609.41 5609.45 5609.66 5609.73 5609.98 5609.63 5609.62 5609.54 5609.30 5609.15 5608.98
C2-P21 5609.97 5610.02 5610.04 5610.29 5610.33 5610.58 5610.28 5610.28 5610.19 5609.83 5609.70 5609.49
C2-P22 5610.71 5610.76 5610.80 5611.03 5611.01 5611.14 5610.84 5610.83 5610.71 5610.37 5610.29 5610.07
C2-P23 5611.74 5611.83 5611.92 5612.20 5612.01 5611.95 5611.87 5611.85 5611.41 5611.19 5610.97 5610.85
Standpipe Piezometers Water Surface Elevation (ft amsl)
Piezometer 7/14/2020 8/5/2020 9/2/2020 10/1/2020 11/2/2020 12/2/2020
C2-P01 5612.43 5612.60 5612.63 5612.47 5612.09 5611.81
C2-P02 5612.38 5612.55 5612.64 5612.55 5612.30 5612.17
C2-P03 5611.40 5611.52 5611.57 5611.49 5611.29 5611.15
C2-P04 5612.97 5612.95 5612.91 5612.75 5612.41 5612.38
C2-P05 5606.68 5606.73 5606.73 5606.75 5606.76 5606.72
C2-P06 5607.70 5607.74 5607.75 5607.77 5607.66 5607.70
C2-P07 5608.32 5608.36 5608.38 5608.36 5608.17 5608.21
C2-P08 5603.65 5603.65 5603.63 5603.63 5603.63 5603.72
C2-P09 5601.70 5601.72 5601.69 5601.76 5601.74 5601.86
C2-P10 5599.86 5599.86 5599.83 5599.91 5599.78 5600.07
C2-P11 5599.59 5599.60 5599.62 5599.72 5599.62 5599.98
C2-P12 5595.69 5595.74 5595.77 5595.85 5595.65 5596.18
C2-P13 5603.99 5604.02 5604.16 5604.13 5604.21 5604.33
C2-P14 5602.28 5602.31 5602.29 5602.34 5602.28 5602.38
C2-P15 5602.17 5602.19 5602.20 5602.19 5602.08 5602.04
C2-P16 5602.64 5602.63 5602.63 5602.59 5602.44 5602.58
C2-P17 5606.26 5606.29 5606.34 5606.43 5606.47 5606.52
C2-P18 5605.20 5605.26 5605.32 5605.29 5605.35 5605.42
C2-P19 5607.58 5607.63 5607.56 5607.48 5607.29 5607.21
C2-P20 5609.07 5609.14 5609.22 5609.26 5609.34 5609.38
C2-P21 5609.60 5609.65 5609.71 5609.77 5609.79 5609.90
C2-P22 5610.20 5610.28 5610.30 5610.33 5610.26 5610.37
C2-P23 5610.88 5610.94 5611.01 5610.96 5610.89 5610.89
5,615
5,610
-~ -5,605 C
0 :.:. ra > CV ~
~ > CV ..., ...
CV ... ~ 5,600
5,595 -C2-P01 ---C2-P02 ~C2-P03
-C2-P07 --+-C2-P08 -e-C2-P09
~C2-P13 -C2-Pl4 -a-C2-P15
-C2-P19 -C2-P20 -e-C2-P21
5,590
Jun-16 Dec-16 Jun-17
Figure 2 -Cell 2 Standpipe Piezometers
Water Level Elevations
........ C2-P04 ~C2-POS ...,._C2-P06
-e-C2-P10 -+-C2-Pll -,!r-C2-Pl2
~C2-P16 ....... C2-P17 """'*-C2-P18
-+-C2-P22 -,!r-C2-P23
Dec-17 Jun-18 Dec-18 Jun-19
Date
Note (1): Pieozometer C2-P01 reading for Mar 20, 2019
was erroneous due to an issue with the water level meter
Dec-19 Jun-20 Dec-20
2216500 2217000 2217500
/
2216500 2217000 2217500
0
0
ENERGY FUELS
200
50
400
Feet
100
Meters
2218000 2218500
2218000 2218500
800
200
C2-P17 +
N
A
2219000
2219000
~
Ilg
C2-P20 +
C2-P22 +
C2-P23 +
2219500
2219500
ENERGY FUELS INC.
225 Union Blvd, Suite 600
Lakewood, Colorado 80228
Cell 2
October 2020 Piezometer Contours
Date: 12/15/2020 DK
2216500 2217000 2217500
2216500 2217000 2217500
0
0
ENERGY FUELS
200
50
400
Feet
100
Meters
2218000 2218500
2218000 2218500
800
200
C2-P17 +
N
A
2219000
2219000
C2~
is.: ~& C2-P21 l7. +
C2-P22 +
/ ~----
(2+23
2219500
2219500
ENERGY FUELS INC.
225 Union Blvd, Suite 600
Lakewood, Colorado 80228
Cell 2
December 2020 Piezometer Contours
Date: 12/15/2020 DK
Attachment D
n n, --N
V, --· 3 n,
V,
C
cil -· :J
I
N 0 0 U)
I
N 0
N
0
+ Vl I'!) -,
16"
V, N
C: :::,
I'!)
CJ -,
v,
I'!) -, 16"
V,
N
w 0 0 0
N \D 0 0
N 00 0 0
Feet Below Top of Standpipe
N .......
0 0
N
°' 0 0
N V,
0 0
N .,::.
0 0
N w
0 0
N N
0 0
N N .... 0 0 0 0 0
1/30/2009
5/30/2009
9/30/2009
1/31/2010
5/31/2010
9/30/2010
1/31/2011
5/31/2011
9/30/2011
1/31/2012
5/31/2012
9/30/2012
1/31/2013
5/31/2013
9/30/2013
1/31/2014
5/31/2014
9/30/2014
1/31/2015
5/31/2015
9/30/2015
1/31/2016
5/31/2016
9/30/2016
1/31/2017
5/31/2017
9/30/2017
1/31/2018
5/31/2018
9/30/2018
1/31/2019
5/31/2019
9/30/2019
1/31/2020
5/31/2020
9/30/2020
Attachment E
WHITE MESA MILL
REPAIR REPORT
CELL4A
February 2021
Prepared by:
Energy Fuels Resources (USA) Inc.
225 Union Boulevard, Suite 600
Lakewood, CO 80228
White Mesa Mill-2021 Repair Report, Cell 4A
Page 2 of7
WHITE MESA MILL
REPAIR REPORT
CELL4A
TABLE OF CONTENTS
1. INTRODUCTION .................................................................................................................. 3
2. INCIDENT HISTORY AND CHRONOLOGY .................................................................... 4
3. ROOT CAUSE ANALYSIS .................................................................................................. 4
4. REPAIR LOCATION AND DIMENSIONS ......................................................................... 5
5. REPAIR TYPE AND DATE ................................................................................................. 5
6. REP AIR PERSONNEL ......................................................................................................... 5
7. NON-DESTRUCTIVE TESTING ......................................................................................... 5
8. CONCLUSIONS .................................................................................................................... 5
9. CERTIFICATION .................................................................................................................. 7
Appendix 1
Appendix 2
Appendix 3
APPENDICES
Letters and Correspondence Regarding Cell 4A Liner
Liner Repair Daily Reports
Repair Photographs
White Mesa Mill -2021 Repair Report, Cell 4A
Page 3 of7
1. INTRODUCTION
Energy Fuels Resources (USA) Inc. ("EFRf'), operates White Mesa Mill's (the "Mill's") Cell 4A as
a part of the Mill's tailings management system. Cell 4A consists of an impermeable 60 mil high
density polyethylene (HDPE) primary flexible membrane liner ("primary FML" or "FML") that
extends across the entire cell floor and the inside side-slopes. The FML is underlain by a leak
detection system ("LDS") consisting of a geonet fabric. The LDS is underlain by a secondary FML
of impermeable 60-mil HDPE. The secondary FML is underlain by a geosynthetic clay liner
consisting of a manufactured geosynthetic clay liner consisting of a layer ofbentonite clay centered
and stitched between two layers of geotextile. The Performance standards, monitoring and
maintenance requirements for Cell 4A are specified in the Best Available Technology requirements
in the Mill's Groundwater Discharge Permit (the "Permit").
Per Parts I.E.8 c) and I.F.3 of the Mill's Permit, if EFRI identifies any damage to the liners of any
tailings cell, EFRI is required to repair the damage in accordance with Section 9.4 of the approved
June 2007 Geosyntec Consultants Cell 4A Construction Quality Assurance Plan, and provide a Liner
Repair Report to the Director of the Division of Waste Management and Radiation Control.
EFRI performed repairs to the Cell 4A FML on November 4, 2020, as discussed below. As a result
of those repairs, this Cell 4A Liner Repair Report (the "Repair Report") is being submitted to comply
with Parts I.F.3 and 1.E.8 c) of the Mill's Groundwater Discharge Permit ("GWDP"). Section 9.4.5.4
of the Geosyntec Consultants Cell 4A Construction Quality Assurance Plan require that the Repair
Report contain the following information:
• Panel containing repair and approximate location on panel
• Approximate dimensions of repair
• Repair type, i.e. fusion weld or extrusion weld
• Date of repair
• Seamer making the repair
• Results of repair non-destructive testing (pass or fail)
Accordingly, the sections of this Repair Report, below, are organized consistent with the items
above.
Part I.F.3 of the RML requires that following the repairs, the
"Repair Report shall be included with the next quarterly Best Available Technology ("BAT")
Report".
Repairs resulting from the event above were completed during the fourth quarter of 2020. This
Repair Report has been included with the fourth quarter 2020 Discharge Minimization Technology
("DMT") Report, being submitted on or before March 1, 2021.
White Mesa Mill -2021 Repair Report, Cell 4A
Page 4 of?
2. INCIDENT HISTORY AND CHRONOLOGY
Part I.E.8.c) of the Permit requires that:
" ... all repairs to the liner shall be completed in accordance with Section 9.4 of the
approved June 2007 Geosyntec Consultants Cell 4A Construction Quality Assurance
Plan as found in Table 5 of this Permit. Repairs shall be performed by qualified liner
repair personnel and shall be reported in a Liner Repair Report, certified by a Utah
licensed Professional Engineer. The Liner Repair Report shall be submitted to for [sic]
Director approval in accordance with Part I.F.3 of the Permit. Any leak, hole or other
damage to the liner will be reported to the Director pursuant to the requirements found in
part I.G.3."
Although Part I.G.3 of the Permit is stated to apply to circumstances where the Permittee fails to
maintain DMT or BAT standards, Part I.E.8.c) requires that the notification provisions of Part
I.G.3 also apply to liner defects or damage, regardless of whether or not the liner defect or
damage constitutes a failure of DMT or BAT. Under Part I.G.3, the Permittee is required to
submit to the Director a notification and description of the defect or damage orally within 24-
hours of the Permittee's discovery, followed by written notification within five calendar days."
On October 29, 2020 during a routine inspection of the cell liners Mill Environmental Personnel
noted a small tear in the liner of Cell 4A. The tear is on the west dike, on top of the liner,
approximately 2 to 3 feet from the anchor trench. The tear is approximately 1 inch by 1 inch. The
tear is not within the solution storage area of the cell.
Mill Environmental Personnel contacted the EFRI Quality Assurance Manager on October 29, 2020
to report the liner damage.
EFRI noted that prior to the inspection, routine maintenance activities were conducted on the Cell
4A piping in the vicinity of the tear. The tear appears to be the result of a dropped tool or brace.
Repairs to the FML were performed and completed on November 4, 2020, in accordance with
Section 9.4 of the Geosyntec Consultants Cell 4A Construction Quality Assurance Plan. As the liner
tear and repair area was above the level of any cell contents, it was not required to remove Cell 4A
from service.
3. ROOT CAUSE ANALYSIS
As discussed above, the liner tear was identified, and likely occurred due to, maintenance on the
piping along the top of Cell 4A. The maintenance on the pipe was required for processing tailings
White Mesa Mill -2021 Repair Report, Cell 4A
Page 5 of7
solutions in the mill. The work required the use of heavy tools and bracing which may have
punctured the FML. Mill personnel have been trained to use caution when working around the cell
liners and to accomplish a post job inspection to ensure that damage has not been done to the FML.
It is anticipated that these provisions will prevent a recurrence of this incident.
4. REPAIR LOCATION AND DIMENSIONS
The repair is located on panel P242 as shown by the photos in Appendix 3. The location is
centered on the panel above the slope crest and next to the anchor trench. The patch is roughly
8" square with rounded edges.
5. REPAIR TYPE AND DATE
All repairs were made via extrusion welding. The hole was patched with a section cut from 60 mil
HDPE roll stock remaining from the lining of Cell 4B (whose FML is constructed of the same
material as Cell 4A). Prior to placement of the new lining material repair patch, the surface was
swept clean of all soils and debris and cleaned with acetone. The patch material was seamed to the
existing liner material via extrusion welding. Repairs were accomplished on November 4th, 2020.
6. REPAIR PERSONNEL
Repairs were accomplished by the Mill's maintenance HDPE Liner Repair Crew. Personnel
include Billy Mendoza, Jaymes Benally, and Kenneth James. Vacuum testing was accomplished
by Kendall Benally and Billy Mendoza.
7. NON-DESTRUCTIVE TESTING
Each repaired location was tested using a "vacuum box" and soapy water to identify any remaining
leaks by observation of air bubbles through the repair seam.
Tests were conducted in accordance with ASTM Standard D5461 utilizing the Manu-tech Service
Projects vacuum box referred to above. Per this standard, tests were conducted such that test areas
overlapped by at least 10% of the minimum vacuum chamber length or at least 2 inches, whichever
is greater, until the entire seam was tested. Per D5461, 4 to 8 psi vacuum was applied and the seam
was observed for air bubbles. If any air bubbles were observed during vacuum testing of the seam,
the test was considered to indicate a seam failure, and the repair and vacuum test repeated.
Specifically, the regulated pressure to the vacuum box was maintained at 30 psig during the test
process and vacuum pressure within the box was recorded in inches of mercury. Test results are
provided with the Liner Repair Report in Appendix 2.
8. CONCLUSIONS
On November 4, 2020, Cell 4A liner repair activities were completed by EFRI maintenance
White Mesa Mill-2021 Repair Report, Cell 4A
Page 6 of7
personnel. Utah Registered Professional Engineer Steve R. Snyder, the Mill's Facility Engineer
reviewed the Liner Repair Report and discussed the repairs made to Cell 4A with maintenance
personnel directly involved.
EFRI believes that the Cell 4A liner repair has been performed consistent with the requirements
of the Cell 4A Construction Quality Assurance Plan.
White Mesa Mill -2021 Repair Report, Cel14A
Page 7 of7
9. CERTIFICATION
I, Steve R. Snyder, a Utah Registered Professional Engineer, was present at the Mill during the
repairs of the Cell 4A liner. I reviewed the foundation preparation activities, liner patch placement,
cleaning and seaming of the liner, and vacuum box testing of the repaired seams with EFRI
maintenance personnel. I subsequently inspected a representative area of repaired liner to confirm the
repairs were consistent with the results described by the maintenance personnel.
I also reviewed the Liner Repair Report for the work conducted during the above-specified period.
Based upon my reviews and discussions, I believe that all of the work was performed in good
workman like manner, and the repairs were completed in accordance with industry standard
practices. The vacuum box testing was being conducted in accordance with the manufacturer's
recommendations and in general agreement with ASTM D 5641. I certify that to the best of my
knowledge the work was conducted in accordance with the Construction Quality Assurance Plan for
Cell 4A Lining System dated June 2007.
Steve R. Snyder, Utah Re
APPENDIX 1
LETTERS AND CORRESPONDENCE
REGARDING
CELL 4A LINER REPAIRS
VIA EMAIL AND EXPEDITED DELIVERY
November 3, 2020
Mr. Ty L. Howard
Director
Division of Waste Management and Radiation Control
Utah Department of Environmental Quality
195 North 1950 West
Salt Lake City, UT 84116
Re: White Mesa Uranium Mill
Utah Ground Water Discharge Permit No. UGW3700004
Energy Fuels Resources (USA) Inc.
225 Union Blvd. Suite 600
Lakewood, CO, US, 80228
303 974 2140
www.energyfuels.com
White Mesa Uranium Mill-Notice Pursuant to Parts I.E.8.c) and I.G.3 of the Permit
Dear Mr. Howard:
Please take notice pursuant to Parts I.E.8.c) and I.G.3 of the White Mesa Mill's (the "Mill's") State of
Utah Groundwater Discharge Permit No. UGW370004 (the "Permit"), that Energy Fuels Resources
(USA) Inc. ("EFRI"), as operator of the Mill and holder of the Permit, identified damage to the Cell 4A
Liner System as described in more detail below.
Repairs to the liner will be completed in accordance with Section 9.4 of the approved June 2007
Geosyntec Consultants Cell 4A Construction Quality Assurance Plan. Repairs are scheduled for the
latter part of the week of November 2, 2020, weather permitting. As required by Part I.E.8.c) of the
permit a repair report will be submitted to the Director with the next quarterly Discharge Minimization
Technology ("DMT") Report (4th Quarter 2020, due on or before March 1, 2021) following completion
of the repairs. The cell will remain in service during and after the repairs.
1. Facts and Background Information
a) Part I.E.8.c) of the Permit requires that:
"Liner Maintenance and Repair -all repairs to the liner shall be completed in accordance
with Section 9.4 of the approved June 2007 Geosyntec Consultants Cell 4A Construction
Quality Assurance Plan (CQNQC Plan) as found in Table 5 of this Permit. Repairs shall
be performed by qualified liner repair personnel and shall be reported in a Liner Repair
Report, certified by a Utah licensed Professional Engineer. The Liner Repair Report shall
be submitted to for Director approval, in accordance with Part I.F.3 of the Permit. Any
leak, hole, or other damage to the liner will be reported to the Director pursuant to the
requirements found in Part I.G.3."
b) Although Part l.G.3 of the Permit is stated to apply to circumstances where the Permittee
fails to maintain DMT or Best Available Technology ("BAT") standards, Part 1.E.8.c)
Letter to Ty L. Howard
November 3, 2020
Page 2 of 3
requires that the notification provisions of Part I.G.3 also apply to liner defects or damage,
regardless of whether or not the liner defect or damage constitutes a failure of DMT or
BAT. Under Part I.G.3, the Permittee is required to submit to the Director a notification
and description of the defect or damage orally within 24-hours of the Permittee's
discovery, followed by written notification within five calendar days."
c) On October 29, 2020 during a routine inspection of the Cell liners, Mill Environmental
Personnel noted a small tear in the liner of Cell 4A. The tear is on the west dike, on top of the
liner, approximately 2 to 3 feet from the anchor trench. The tear is approximately 1 inch by 1
inch (see Attachment 1). The tear is not within the solution storage area of the cell.
d) Mill Environmental Personnel contacted the EFRI Quality Assurance Manager ("QAM") on
October 29, 2020 to report the liner damage.
e) EFRI noted that prior to the inspection, routine maintenance activities were conducted on the
Cell 4A piping in the vicinity of the tear. The tear appears to be the result of a dropped tool or
brace.
2. Actions taken
The following actions were taken following identification of the liner tear.
a) Initial notice of this outage was given by telephone to Mr. Russ Topham of the Division of
Waste Management and ,Radiation Control ("DWMRC") at approximately 2:30pm on
Thursday October 29, 2020 (within 24 hours of the QAM receiving notice, and within 24
hours of Mill Environmental Personnel discovery).
b) EFRI opened an investigation into the possible causes.
c) Repairs were scheduled.
3. Actions Taken to Prevent a Recurrence of This Incident
The following actions will be taken to prevent a reoccurrence of this incident:
As discussed above, the liner tear was identified, and likely occurred due to routine maintenance
activity.
During routine monthly training, Mill Personnel will be reminded to take extra precautions with tools
and equipment when performing maintenance activities on or near the cell liners.
4. Required Reporting
As required by Part I.E.8.c) of the permit and by the approved June 2007 Geosyntec Consultants Cell 4A
Construction Quality Assurance Plan, a repair report will be submitted to the Director with the next
Letter to Ty L. Howard
November 3, 2020
Page 3 of 3
quarterly DMT Report following completion of the repairs. Repairs are scheduled for the latter part of
the week of November 2, 2020, weather permitting. The repair report will be submitted with the fourth
quarter 2020 DMT Report on or before March 1, 2021. The repair report will contain the following
elements:
• Repair narrative describing the nature of the damage and the repair work completed to repair the
damage.
• Repair material type used to complete the repair
• Repair material description
• Post repairs test specifications
• Test Methods (ASTM or other)
• Daily reports during the repair work
• Repair test results
• Quality Assurance/Quality Control Information
5. Affirmative Defense
EFRI does not believe that identification of a defect or damage to the Cell 4A liner caused by
maintenance activities and repair of such defect or damage in accordance with the Mill's Liner
Maintenance Provisions constitutes a failure of BAT under the Permit. Further, the damage to the Cell
4A liner was above the level of any tailings contained in the cell. As a result, EFR is not making a claim
for an affirmative defense under Part I.G.3 of the Permit.
If you have any questions, please contact me at [phone].
;;;;;;~
ENERGY FUELS RESOURCES (USA) INC.
Kathy Weinel
Quality Assurance Manager
cc Scott Bakken
David Frydenlund
Julia Hoffmeier
Tanner Holliday
Garrin Palmer
Logan Shumway
Terry Slade
Steve Snyder
ATTACHMENT 1
APPENDIX2
LINER REPAIR DAILY REPORTS
Cell # Cell #4a
Date: 4 Nov. 2020
Start Time: 7:00am
End Time: 11 :30am
Liner Repair Report
Linear feet exposed for inspection: _ _._;6::....'.....:' xc::....=.8_" ___ _
Description of damage or clear of any defects:
Slope on West side 1 area where repair was needed!
Description of the repair work utilized to repair the damage:
Top of liner.
Material used to complete the repairs:
Acetone ( cleaner)
Repair Material -(describe in detail):
Extrusion Machine. Added small HOPE liner patch.
Weather Conditions:
*56 Deg.
Personnel performing the repair work:
*HDPE Liner Repair Crew-Billy, Jaymes, and Kenneth.
*Vacuum Testers-Billy and Jaymes.
Vacuum Checks if conducted: Conducted Vacuum Checks. See Below
Notes: Repaired one small 2" x 2" with an overlay of 6"x 8" patch.
8 Vacuum Tests-4th of Nov. 2020.
1) 5 hg.
2) 5 hg.
3) 5 hg.
4) 5 hg.
S) 5 hg.
NOTE: All testing of the repaired material will be in compliance with ASTM D5641
APPEND1X3
REPAIR PHOTOGRAPHS
Attachment F
Cell 4A LDS Monitoring Information
October2020 November 2020 December 2020
Weekly measurements in
inches from transducer at Weekly measurements in Weekly measurements in
the bottom of the LDS Flow Meter inches from transducer at the Flow Meter inches from transducer at the Flow Meter
Date sump. in Gallons Date bottom of the LDS sump. in Gallons Date bottom of the LDS sump. in Gallons
10/01/20 2.6 648158 11/01/20 4.6 648877 12/01/20 4.6 649293
10/02/20 3.4 648158 11/02/20 5.4 648877 12/02/20 5.1 649293
10/03/20 3.3 648158 11/03/20 5.5 648877 12/03/20 5.3 649293
10/04/20 4.1 648158 11/04/20 5.5 648877 12/04/20 5.5 649293
10/05/20 4.5 648158 11/05/20 5.3 648877 12/05/20 4.8 649293
10/06/20 3.6 648158 11/06/20 4.5 648877 12/06/20 4.9 649293
10/07/20 4.2 648158 11/07/20 5.6 648877 12/07/20 3.2 649293
10/08/20 5.2 648158 11/08/20 6.1 648877 12/08/20 5.2 649293
10/09/20 4.9 648158 11/09/20 5.8 648877 12/09/20 4.6 649293
10/10/20 4.8 648158 11/10/20 5.2 648877 12/10/20 4.8 649293
10/11/20 5.5 648158 11/11/20 3.6 648877 12/11/20 5.6 649293
10/12/20 5.2 648158 11/12/20 3.9 648877 12/12/20 4.6 649293
10/13/20 4.8 648158 11/13/20 4.5 648877 12/13/20 5.7 649293
10/14/20 5.2 648158 11/14/20 6.1 648877 12/14/20 3.5 649293
10/15/20 5.5 648158 11/15/20 5.4 648877 12/15/20 4.7 649293
10/16/20 5.3 648158 11/16/20 5.0 648877 12/16/20 4.5 649293
10/17/20 5.9 648158 11/17/20 6.0 648877 12/17/20 4.0 649293
10/18/20 6.0 648158 11/18/20 5.8 648877 12/18/20 4.5 649293
10/19/20 7.1 648158 11/19/20 7.4 648877 12/19/20 5.1 649990
10/20/20 5.3 648158 11/20/20 7.2 648877 12/20/20 5.1 649990
10/21/20 5.7 648158 11/21/20 7.2 648877 12/21/20 5.4 649990
10/22/20 5.0 648158 11/22/20 5.8 648877 12/22/20 4.0 649990
10/23/20 7.5 648158 11/23/20 6.0 648877 12/23/20 5.1 649990
10/24/20 7.1 648158 11/24/20 6.4 648877 12/24/20 4.2 649990
10/25/20 6.7 648158 11/25/20 2.8 649293 12/25/20 4.0 649990
10/26/20 7.8 648158 11/26/20 3.1 649293 12/26/20 5.2 650008
10/27/20 7.8 648158 11/27/20 5.0 649293 12/27/20 5.8 650008
10/28/20 7.0 648158 11/28/20 4.8 649293 12/28/20 2.9 650214
10/29/20 3.8 648877 11/29/20 5.5 649293 12/29/20 3.5 650214
10/30/20 5.0 648877 11/30/20 4.6 649293 12/30/20 3.7 650214
10/31/20 5.0 648877 12/31/20 4.3 650214
Total Gallons Pumped per Month 719 416 921
Total Gallons pumped for Q4 2,056
Cell 4B LOS Monitoring Information
October2020 November 2020 December 2020
Weekly measurements in
Weekly measurements in Weekly measurements in inches from transducer at
inches from transducer at the Flow Meter inches from transducer at the Flow Meter the bottom of the LDS Flow Meter
Date bottom of the LDS sump. in Gallons Date bottom of the LDS sump. in Gallons Date sump. in Gallons
10/01/20 3.90 411860 11/01/20 3.90 412052 12/01/20 3.90 412224
10/02/20 3.90 411860 11/02/20 3.90 412052 12/02/20 3.90 412224
10/03/20 3.90 411860 11/03/20 3.90 412052 12/03/20 3.90 412224
10/04/20 3.90 411860 11/04/20 3.90 412052 12/04/20 3.90 412224
10/05/20 3.90 411860 11/05/20 3.90 412052 12/05/20 3.90 412224
10/06/20 3.90 411860 11/06/20 3.90 412052 12/06/20 3.90 412224
10/07/20 3.90 411860 11/07/20 3.90 412052 12/07/20 3.90 412224
10/08/20 3.90 411860 11/08/20 3.90 412052 12/08/20 3.90 412224
10/09/20 3.90 411860 11/09/20 3.90 412052 12/09/20 3.90 412224
10/10/20 3.90 411861 11/10/20 3.90 412052 12/10/20 3.90 412224
10/11/20 3.90 411861 11/11/20 3.90 412052 12/11/20 3.90 412224
10/12/20 3.90 411861 11/12/20 3.90 412052 12/12/20 3.90 412224
10/13/20 3.90 411861 11/13/20 3.90 412052 12/13/20 3.90 412224
10/14/20 3.90 411861 11/14/20 3.90 412052 12/14/20 3.90 412224
10/15/20 3.90 411861 11/15/20 3.90 412052 12/15/20 3.90 412224
10/16/20 3.90 411861 11/16/20 3.90 412052 12/16/20 3.90 412224
10/17/20 3.90 411861 11/17/20 3.90 412052 12/17/20 3.90 412224
10/18/20 3.90 411861 11/18/20 3.90 412052 12/18/20 3.90 412224
10/19/20 3.90 411861 ll/19/20 3.90 412052 12/19/20 3.90 412224
10/20/20 3.90 411861 11/20/20 3.90 412052 12/20/20 3.90 412224
10/21/20 3.90 411861 11/21/20 3.90 412052 12/21/20 3.90 412224
10/22/20 3.90 411861 11/22/20 3.90 412052 12/22/20 3.90 412224
10/23/20 3.90 411861 11/23/20 3.90 412052 12/23/20 3.90 412224
10/24/20 3.90 411861 11/24/20 3.90 412052 12/24/20 3.90 412224
10/25/20 3.90 411861 11/25/20 3.90 412224 12/25/20 3.90 412224
10/26/20 3.90 411861 11/26/20 3.90 412224 12/26/20 3.90 412224
10/27/20 3.90 411861 11/27/20 3.90 412224 12/27/20 3.90 412224
10/28/20 3.90 411861 11/28/20 3.90 412224 12/28/20 3.90 412284
10/29/20 3.90 412052 11/29/20 3.90 412224 12/29/20 3.90 412284
10/30/20 3.90 412052 11/30/20 3.90 412224 12/30/20 3.90 412284
10/31/20 3.90 412052 12/31/20 3.90 412284
Total Gallons Pumped per Month 192 172 60
Total Gallons pumped for Q4 424
White Mesa Mill -Discharge Minimization Technology Monitoring Plan 12/16 Revision: EFRI 12.4
Page 25 of25
ATTACHMENT C
TABLES
Table IA
Calculated Action leakage Rates
for Various head Conditions
Cell 4A White Mesa Mill
Blanding, Utah
Head above Liner System (feet) Calculated Action leakage Rate
5
10
15
20
25
30
35
37
( gallons / acre / day )
Table lB
Calculated Action leakage Rates
for Various head Conditions
Cell 4B White Mesa Mill
Blanding, Utah
222.04
314.01
384.58
444.08
496.50
543.88
587.46
604.01
Head above Liner System (feet) Calculated Action leakage Rate
( gallons I acre / day)
5 211.40
10 317.00
15 369.90
20 422.70
25 475.60
30 528.40
35 570.00
37 581.20
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 IA (for Cell 4A) or Table
lB (for Cell 4B) 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 IA or lB) X Acres of Tailings Cell Fluids=
Maximum Daily Allowable Flow Volume
Max head on Cell 4A FML
Max elevation (ft.)
FML elevation (ft.)
Head (ft.)
From BAT O&M Table lA (gallon/acre/day)
Acres of fluid based on maximum level (acres)
Max allowable flow rate (gal/day)
4A-Q4 2020
5588.96
5555.55
33.41
587.46
39.32
23,099
Max head on Cell 4B FML
Max elevation (ft.)
FML elevation (ft.)
Head (ft.)
From BAT O&M Table lB (gallon/acre/day)
Acres of fluid based on maximum level (acres)
Max allowable flow rate (gal/day)
4B-Q4 2020
5566.52
5557.50
9.02
317.00
31.38
9,947
Cell 1, Cell 2, and Cell 3 LDS Monitoring Information -Fourth Quarter 2020
Cell 1 Cell 2 Cell 3
Measurement in inches Measurement in inches Measurement in inches
Date from transducer at the Date from transducer at the Date from transducer at the
bottom of the LDS sump. bottom of the LDS sump. bottom of the LDS sump.
10/1/2020 Dry 10/1/2020 Dry 10/1/2020 Dry
10/8/2020 Dry 10/8/2020 Dry 10/8/2020 Dry
10/16/2020 Dry 10/16/2020 Dry 10/16/2020 Dry
10/23/2020 Dry 10/23/2020 Dry 10/23/2020 Dry
10/30/2020 Dry 10/30/2020 Dry 10/30/2020 Dry
Cell 1 Cell 2 Cell 3
Measurement in inches Measurement in inches Measurement in inches
Date from transducer at the Date from transducer at the Date from transducer at the
bottom of the LDS sump. bottom of the LDS sump. bottom of the LOS sump.
11/6/2020 Dry 11/6/2020 Dry 11/6/2020 Dry
11/13/2020 Dry 11/13/2020 Dry 11/13/2020 Dry
11/20/2020 Dry 11/20/2020 Dry 11/20/2020 Dry
11/25/2020 Dry 11/25/2020 Dry 11/25/2020 Dry
Cell 1 Cell 2 Cell 3
Measurement in inches Measurement in inches Measurement in inches
Date from transducer at the Date from transducer at the Date from transducer at the
bottom of the LDS sump. bottom of the LDS sump. bottom of the LDS sump.
12/4/2020 Dry 12/4/2020 Dry 12/4/2020 Dry
12/9/2020 Dry 12/9/2020 Dry 12/9/2020 Dry
12/18/2020 Dry 12/18/2020 Dry 12/18/2020 Dry
12/24/2020 Dry 12/24/2020 Dry 12/24/2020 Dry
12/31/2020 Dry 12/31/2020 Dry 12/31/2020 Dry
Attachment G
This attachment has been deliberately left blank.
Attachment H
White Mesa Mill -Discharge Minimization Technology Monitoring Plan
AITACHMENT B
FEEDSTOCK STORAGE AREA
DATE: /o/§ /7,.c,.J I ,
12/16 Revision: EFRI 12.4
Page24 of25
-··-··-·------~•'f .4-------·-·· ~····~----------
p,·
White Mesa MilJ -Discharge Minimization Technology Monitoring Plan
ATTACHMENT B
FEEDSTOCK STORAGE AREA
DATE: /o/i,J~o ~.
12/16 Revision: EFRI 12.4
Page24 of25
~ ... a......----·-_,,,, __ -·it-----·-· .. .,, ..... _.._..,.,, ___.....,........__.,._..... __ __.,,
•
White Mesa Mill -Discharge Minimization Technology Monitoring Plan
ATfACHMENTB
FEEDSTOCK STORAGE AREA
DATE: IO-r,J-! 0
12/16 Revision: EFRI 12.4
Page 24 of25
_, ....... -----_,,,.-··"' .,-------1-· ....... ~,,., ____ ...........,. _._....,.
I •
White Mesa Mill -Discharge Minimization Technology Monitoring Plan 12/16 Revision: EFRI 12.4 Page24 of25
ATTACHMENTB
FEEDSTOCK STORAGE AREA
DATE: /o/1•./ia -----------... -. ~·---. --....___. -· ........ _..._....,.., --------~_,.__ ... _....,,,.,
White Mesa Mill ,.. Discharge Minimization Technology Monitoring Plan
ATTACHMENTB
FEEDSTOCK STORAGE AREA
DATE: 11/t }7-0
12/16 Revision: EFRI 12.4
Page 24 of25
._, .. ..._. _____ _ ----~· ..... --~·-·· ...... -.-.. .... -_....._.._ --.....,
White Mesa Mill -Discharge Minimization Technology Monitoring Plan
ATTACHMENTB
FEEDSTOCK STORAGE AREA
DATE: I I/ /J /7,0 '
12/16 Revision: EFRI 12.4
Page 24 of25
·-----,--·-··.,------·-·· ....... __..._.... . .,...------·---
•
White Mesa Mill -Discharge Minimization Technology Monitoring Plan
ATTACHMENTB
FEEDSTOCK STORAGE AREA
DATE: 11/z.o#-t>
12/16 Revision: EFRI 12.4
Page24 of25
_,, .... ___ _ ----<!· .. ----........_..-, ...... -~ ...... -------
-· "
White Mesa Mill -Discharge Minimization Technology Monitoring PJan
ATTACHMENTB
FEEDSTOCK STORAGE AREA
12/16 Revision: EFRl 12.4
Page24 of25
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l_
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White Mesa Mill -Discharge Minimization Technology Monitoring Plan 12/16 Revision; EFRI 12.4
Page24 of25
AITACHMENT B
FEEDSTOCK STORAGE AREA
DATE: I z I '-1 IZo
_.,.. --~-.... --------· --· .. ···----:--ac-:--. ,.._.....,_,_ ..... ---~
F ltd~---
•
White Mesa Mill -Discharge Minimization Technology Monitoring Plan
ATTACHMENTB
FEEDSTOCK STORAGE AREA
DATE: 1 z:. l 1 d to
12/16 Revision: EFR112.4
Page24 of25
-----~ ~,,,, ... -~·· -· ----------· -··· ....... ~---·-------
,. • •
White Mesa Mill -Discharge Minimization Technology Monitoring Plan
A 'ITACHMENT B
FEEDSTOCK STORAGE AREA
12/16 Revision: EFRI 12.4
Page 24 of25
_. .......... ----· ---~ ......---.... -----·--~_ ............... ~------------
" .. " •
White Mesa Mill -Discharge Minimization Technology Monitoring Plan
ATTACHMENTB
FEEDSTOCK STORAGE AREA
DATE: /J .1,,1-U)
12/16 Revision: EFRl 12.4
Page24 of25
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White Mesa Mill -Discharge Minimization Technology Monitoring Plan
A'ITACHMENT B
FEEDSTOCK STORAGE AREA
DA TB: i '2-/ :r ii 'Z-0
12/16 Revision: EFRI 12.4
Page24 of25
-·-----.,..,,..-••• J-4. • .. ........_, ............. __......._..,, ____ .......,.._ _ _._,,,,.
Attachment I
Energy Fuels Resources (USA) Inc.
White Mesa Mill
Precipitation Chart
Rain or Snow Recorded in Inches of Moisture Received
YEAR 2020 Month October
Rain Snow Rain Snow
1 17
2 18
3 19
4 20
5 21
6 22
7 23
8 24
9 25
10 26 .OC:,
11 27
12 28
13 29
14 30
15 31
16
Combined
Total: • OC:,
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
Energy Fuels Resources (USA) Inc.
White Mesa Mill
Precipitation Chart
Rain or Snow Recorded in Inches of Moisture Received
YEAR 2020 Month November
Rain Snow Rain Snow
17
18
19
20
21
22
.03 23
.11 24
I DZ. 25
26
27
28
29
30
31
Combined
Total: Q.lfu
Energy Fuels Resources (USA) Inc.
White Mesa Mill
Precipitation Chart
Rain or Snow Recorded in Inches of Moisture Received
YEAR 2020 Month December
Rain Snow Rain Snow
1 17
2 18
3 19
4 20
5 21
6 22
7 23
8 24
9 25
10 26
11 27 0.31
12 28 • O'?:> ,OR
13 29 . ,o . oi;
14 30
15 31
16
Combined
Total: 0.5b