DRC-2015-001668 - 0901a0688050d98d

ENERGYFUELS
Energy Fuels Resources (USA) Inc.
225 Union Blvd. Suite 600
Lakewood, CO, US, 80228
303 974 2140
www.enerpvfuels.com
March 9,2015 DRC-2015-001668
Sent VIA OVERNIGHT DELIVERY
Mr. Rusty Lundberg
Director
Division of Radiation Control
Utah Department of Environmental Quality
195 North 1950 West
P.O. Box 144850
Salt Lake City, UT 84114-4820
Re: Transmittal of Tailings Data Analysis Report and Probabilistic Seismic Hazard Analysis
Report, White Mesa Uranium Mill, Radioactive Materials License UT 1900479
Dear Mr. Lundberg:
Attached please find two copies of the White Mesa Uranium Mill Tailings Data Analysis Report and
two copies of the Probabilistic Seismic Hazard Analysis Report, each with a CD containing a word
searchable electronic copy of the report. In addition, a hardcopy and electronic copy of the text of
each report has been provided in redline/strikeout for your convenience.
These reports address comments in the Division of Radiation Control ("DRC") letter dated January 22,
2015. The comments in the DRC letter have been addressed by direct incorporation into the revised
reports. Responses to several of the January 22, 2015 comments on the Probabilistic Seismic Hazard
Analysis Report require clarification on timing, approach, and data sources used in the original
analysis. The clarifications are included in the MWH memorandum included as Attachment 1 to this
transmittal letter.
If you should have any questions regarding this report please contact me at 303-389-4134.
Yours very truly,
ENERGY FUELS RESOURCES (USA) INC.
Kathy Weinel
Quality Assurance Manager
CC: David C. Frydcnlund
Harold R. Roberts
David E. Turk
Dan Hillsten
Scott Bakken
Energy Fuels Resources (USA) Inc.
225 Union Blvd. Suite 600
Lakewood, CO, US, 80228
ENERGYFUELS 303 974 2140
www.energvfuels.com
ATTACHMENT 1
MWH Memorandum
© MWH MEMORANDUM
BUILDING A BETTER WORLD
TO: Harold Roberts, Denison Mines (USA) Corp. DATE: March 9, 2015
FROM: Melanie Davis and Eileen Dornfest REFERENCE: 1009740
SUBJECT: White Mesa Probabilistic Seismic Hazard Analysis (PSHA) Report
MWH has updated the Probabilistic Seismic Hazard Analysis (PSHA) Report to address
comments provided by the Utah Department of Environmental Quality, Division of Radiation
Control (DRC) on January 22, 2015. The comments are addressed directly in the report
attached to this memorandum. Responses to several of these comments require clarification on
timing, approach, and data sources used in the original analysis.
The July 2014 MWH PSHA report was reviewed by URS approximately 6 months after it was
prepared. During this time several advancements in the field of seismic hazard were published
and made available for public use. In particular, these include final Next Generation Attenuation
West 2 ground motion prediction equations, published in the August 2014 Earthquake Spectra
Journal, and updated 2014 USGS Seismic Hazard Maps, available on July 17, 2014. Therefore,
this published information was not available at the time the PSHA was being performed. Pre-
prints of the 2014 NGA West 2 models were available during preparation of the July 2014
report, but MWH's outside seismic hazard consultant recommended that the new models not be
used until the information was published. Because several other changes were made to the
PSHA in response to comments from URS, the 2014 NGA West 2 models and the updated
2014 USGS catalog was used in the updated analyses described in the PSHA attached.
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