DRC-2021-006148 - 0901a06880e7f1f1

DRC-2021-006148 195 North 1950 West • Salt Lake City, UT Mailing Address: P.O. Box 144880 • Salt Lake City, UT 84114-4880 Telephone [phone] • Fax [phone] • T.D.D. [phone]
www.deq.utah.gov
Printed on 100% recycled paper
State of Utah
SPENCER J. COX Governor DEIDRE HENDERSON Lieutenant Governor
Department of Environmental Quality
Kimberly D. Shelley Executive Director
DIVISION OF WASTE MANAGEMENT AND RADIATION CONTROL Jalynn Knudsen Interim Director

May 5, 2021
Kathy Weinel, Quality Assurance Manager
Energy Fuels Resources (USA) Inc.
225 Union Blvd., Suite 600 Lakewood, CO 80228 RE: Energy Fuels Resources, White Mesa Uranium Mill April 23, 2021 Request to Return Certain Groundwater Monitoring Parameters to Baseline Monitoring Frequency.
Utah Groundwater Discharge Permit No. UGW370004 Dear Ms. Weinel:
The Division of Waste Management and Radiation Control (DWMRC) has completed review of the
Energy Fuels Resources (USA) Inc. (EFRI), April 23, 2021, State of Utah Ground Water Discharge
Permit No. UGW370004 White Mesa Uranium Mill – Removal of Certain Groundwater Monitoring Parameters from Accelerated Monitoring Status. EFRI requests that certain monitoring well parameters be returned to baseline monitoring as listed on the
table below:
Monitoring
Well
Parameter Number of Consecutive
Sample Results Below the GWCL
Baseline Monitoring
Frequency
MW-28 Gross Alpha 8 Semi-annual
MW-26 Total Dissolved Solids (TDS) 5* Quarterly

*Per a March 15, 2021 DWMRC letter regarding review of the Plan and Time Schedule for MW-26 it
was noted that the MW-26 TDS exceedances were due to laboratory error and that confirmation of
return to compliance through the 1st Quarter 2021 would suffice for return to baseline monitoring frequency. (Over)

It was noted in review of groundwater monitoring data, including laboratory data sheets included with
the April 23, 2021 EFRI Request, that MW-28 Gross Alpha had sample results below the Permitted
Ground Water Compliance Limits (GWCLs) for the most recent eight consecutive accelerated sampling events; and that MW-26 TDS results for the 1st Quarter 2021 were below the groundwater compliance limit. In accordance with past DWMRC protocols, accelerated monitoring may be discontinued if at least eight consecutive samples show concentrations below the GWCL, which is the case for MW-28 Gross Alpha. In DWMRC review of TDS in MW-26, the exceedances were due to laboratory error,
which has been resolved as demonstrated by the 1st Quarter 2021 sample results. Therefore, the request to return to baseline monitoring for the wells and parameters listed on the previous table is hereby approved.
If you have any questions, please call Tom Rushing at [phone].
Sincerely,
Phil Goble, Uranium Mills and Radioactive Materials Section Manager Division of Waste Management and Radiation Control PRG/TR/as

c: Mike Moulton, Interim Health Officer, San Juan County Public Health Department Ronnie Nieves, Environmental Director, San Juan County Public Health Department Russell Seeley, UDEQ District Engineer