2010-02-25_REPORT - M2007044

• Permit No: M2007044
• IBM Index Class Name: REPORT
• Doc Date: 2/25/2010
• Doc Name: 2009 Radon emissions modeling
• From: Energy Fuels Resources
• To: USEPA Region 8, Indoor Air Program
• Email Name: GRM
• Media Type: D
• Archive: No

E- n er
.qy Fuels REsources
CL r E®
MAR U 3 2010
February 22, 2010 pia of Reclamation, E CM
Aftft and Sd*
Mrs. Angelique Diaz FEB 2 5 20)0
USEPA Region 8, Indoor Air Program
GRAND JUIU { 7,11 , rLLo OFFICE
1595 WYnkoop St. DIVISION of
Mail Code: 8P-AR RECLAMATION MINING & SAFETY
Denver, CO 80202-1129
[phone]
Re: 2009 Radon Emissions Modeling for the Whirlwind Mine, 114-ole,o7- o'41
Dear Mrs. Diaz,
Please see the attached 2009 Radon Emissions Modeling Report for the Whirlwind Mine.
The Whirlwind Mine is an underground uranium mine located at 30100 5110 Road in
Gateway, Colorado. The effective dose equivalent of radon exposure to the nearest
resident, school or office to an underground uranium mine is required to be calculated by
40 CFR 61 Subpart B. The radon effective dose equivalent was calculated using the
COMPLY-R program.
The mine is operated by Mr. Dick White, General Manager and this report was prepared
by Zach Rogers, Environmental Engineer. Radon was measured using Landauer Radtrak
Environmental Monitors placed in the mine decline, near the portal. The mine portal is
the only ventilation point of the Whirlwind Mine. The following parameters were used to
calculate the radon effective dose equivalent:
• The flow rate at the portal was measured on a monthly basis. Refer to the attached
Radon Emissions Calculation Sheet for the monthly measured flow rates and hours of
operation.
• The nearest public receptor is a part-time resident, located approximately 600 meters
northwest of the mine portal.
• The average wind speed was assumed to be 2.0 m/s (COMPLY-R default value).
• The Whirlwind Mine was on stand-by during 2009 with maintenance activities in the
mine being conducted throughout the year.
• Average radon concentrations were measured on a quarterly basis. Refer to the
attached Radon Emissions Calculation Sheet for the quarterly radon concentrations.
• A total calculated value of 0.322 Ci of radon was emitted from the mine portal. The
calculation was based on ventilation flow rates, hours of operation, and radon
concentrations. See attached Radon Emissions Calculation Sheet.
Energy Fuels, Inc. 44 Union Blvd., Suite 600
www.energyfuels.com Lakewood, Colorado 80228
Phone: [phone]
Fax: [phone]