DRC-2021-023464 - 0901a06880fe2b12

December 28, 2021
Sent VIA E-MAIL AND EXPEDITED DELIVERY
Mr. Doug Hansen
Director
Division of Waste Management and Radiation Control
Utah Department of Environmental Quality
195 North 1950 West
Salt Lake City, UT 84116
ON of
and Ratattun .L-,unt,ut
LEC 3 0 2021
Re: Transmittal of the As-Built Drawings for EFRI White Mesa Mill Secondary Containment
for Hydrochloric Acid Tanks
Dear Mr. Hansen:
Pursuant to the Division of Waste Management and Radiation Control ("DWMRC") letter dated
October 15, 2021 Energy Fuels Resources (USA) Inc. ("EFRI") is subrnitting the as-built drawings as
Attachment 1 to this letter for EFRI' s secondary containment structure for additional tanks at the
White Mesa Mill (the "Mill"). Additionally, EFRI is submitting as Attachrnent 2, the calculations
showing that the sizing of the secondary containment is adequate to hold the volume of one tank and
the volume of water resulting from a 25-year-24-hour storm event.
EFRI submitted a Request to Amend and Notice of Intent ("NOI") on July 27, 2021 to the Utah
Division of Air Quality ("DAQ") for the Mill's Air Approval Order ("AO") for the addition of
hydrochloric acid storage at the Mill. By letter dated December 23, 2021, DAQ approved the
Modification to Approval Order DAQE-AN112050020-19 for Three (3) New Hydrogen Chloride
Tanks, Project Number: N112050024. EFRI is installing the hydrochloric acid storage tanks to
provide operational flexibility and to improve opportunities for waste reduction via recycling of
tailings constituents and off-spec product.
Please note that while the NOI was for three additional tanks, only two are being constructed at this
time. EFRI will submit design drawings, under separate cover, prior to the construction of the third
tank.
Per the October 15, 2021 letter, the additional costs for removal of these structures during reclamation
will be updated during the next scheduled submission of the surety estimate in March 2022.
Energy Fuels Resources (USA) Inc.
225 Union Blvd. Suite 600
Lakewood, CO, US, 80228
303 974 2140
ORC- 2,o21- O234-611- www.energyfuels.com
Letter to Doug Hansen
December 28, 2021
Page 2
Updates to the Spill Prevention, Control and Countermeasures Plan ("SPCC"), Storm Water Best
Management Practices Plan ("SWBMPP") and the Discharge Minimization Technology Plan
("DMT") Plan will be submitted under separate cover.
Please contact me if you have any questions or comments on these drawings.
Yours very truly,
41:14/ IA--14
ENERGY FUELS RESOURCES (USA) INC.
Kathy Weinel
Quality Assurance Manager
cc: Scott Bakken
David Frydenlund
Garrin Palmer
Logan Shumway
Steve Snyder
Attachment 1
3' 3'
c>
SCRUBBER PAD
8"
STORAGE TANK 2\ FOUNDATION
— 3' —
30'—'10" 29'-6"
6" CONCRETE SLAB
W/ #4 BARS ©
12" O.C. T.B. EA. WAY
2' 3'
39'
40' 4"
ARRANGEMENT
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SUMP
2'X2'X2'
N/A
AS CONSTRUCTED
VF Energy Fuels Resources (USA) Inc.
REVISIONS Project RARE EARTH PROCESSING
Date By GO": SAN JUAN I State. UTAH
Location- WHITE MESA MILL
HYDROCHLORIC ACID TANK
TANK CONTAINMENT & FOUNDATION
SHEET 1 OF 2
Author. ss I Date: 12/28/2021 rafted By:SS i
Project: RARE EARTH PROCESSING REVISIONS
CountY: SAN JUAN State: UTAH
15'-0"
WATER STOP STRIP
SECTION 1'-0"
UNDISTURBED OR RECOMPACTED NATIVE SOIL
8"
SECTION
0 12" O.C. HORIZ.
#4 0 12" O.C. VERTS
WATER STOP STRIP
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=HT -1-4-1-n-H‘-H-H-=H:.H-H-R-H-H-0==-4
UNDISTURBED OR RECOMPACTED NATIVE SOIL
1111111111111111111111 1
•
TOC FOR ALL TANK PADS
TO BE SAME ELEVATION
SECTION
SECTION
AS CONSTRUCTED
31F Energy Fuels Resources (USA) Inc.
Locati°n: WHITE MESA MILL
HYDROCHLORIC ACID TANK
TANK CONTAINMENT & FOUNDATION
SHEET 2 OF 2
l Date: 12/28/2021 I Dta"ea BY:SS N/A
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HCI Storage Tank Containment Calculations
Containment Area
39 ft x 20.5 ft = 1,150.5 sqft
Area of Tanks Within the Containment
A = TtD2/4
2 ea @ 13'-9" Diameter A = 148.5 sqft ea
1 ea @ 5'-1" Diameter A = 20.3 sqft
Actual Containment Area
Aa = 1150.5 sqft — 148.5 sqft — 148.5 sqft — 20.3 sqft = 833.2 sqft
Actual Containment Volume
Vc = Wall Height x Containment Area
Vc = 2.5 ft x 833.2 sqft = 2083, cuft
Volume To Be Contained
Largest Tank Volume
13,650 gal = 1824.9 cult
25 yr 24 hr Storm Event
From NOAA Atlas 14, Volume 1, Version 5 for Blanding Utah
Precipitation = 2.32 in = 0.2 ft
V = Precipitation x Containment Area
V = 0.2 ft x 1,150.5 sqft = 230.1 cuft
Total Required Containment Volume
VR = Tank Volume + Storm Event Volume
VR = 1,824.9 cuft + 230.1 cuft = 2,055 cuft