DRC-2017-000583 - 0901a068806a0e76

Div of Waste Management
and Radiation Control
JAN 1
Energy Fuels Resources (USA) Inc.
225 Union Blvd. Suite 600
Lakewood, CO, US, 80228
303 974 2140
wt'Tbn-oom?www.energyfuels.com
January 16, 2017
Sent VIA OVERNIGHT DELIVERY
Mr. Scott Anderson
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 84114-4820
Re: Transmittal of Revised Groundwater Compliance Limits for manganese and cadmium in MW-
03A at the White Mesa Uranium Mill, Groundwater Discharge Permit No. UGW370004
Dear Mr. Anderson:
Pursuant to a request from the Division of Waste Management and Radiation Control (“DWMRC”), Energy
Fuels Resources (USA) Inc. (“EFRI”) has recalculated the Groundwater Compliance Limits (“GWCLs”) for
manganese and cadmium in MW-03A. The attached memorandum from Intera follows the approved flowsheet
and provides the resultant, lower GWCLs.
If you should have any questions regarding this report please contact me.
Yours very truly,
Energy Fuels Resources (USA) Inc.
Kathy Weinel
Quality Assurance Manager
CC: David C. Frydenlund
Harold R. Roberts
David E. Turk
Logan Shumway
Scott Bakken
SIIMTERA
GEOSCIENCE S. ENGINEERING SOLUTIONS
INTERA Incorporated
6000 Uptown Boulevard NE, Suite 220
Albuquerque, New Mexico S71 1 O USA
505.246.1600
TECHNICAL MEMORANDUM
DATE: January 16, 2017
FROM: Angela Persico, INTERA, Incorporated
TO: Kathy Weinel, Energy Fuels Resources, Inc.
SUBJECT: Revised GWLCs for Cadmium and Manganese in MW-03A
The Division of Waste Management and Radiation Control (DWMRC) has requested an update
to the groundwater compliance limits (GWCLs) in MW-3A for cadmium and manganese. The
request for revision of these GWCLs is due to the limited data set when background was
established for this well. After receiving additional data, it is apparent that GWCLs were set at
concentrations greater than current conditions in the well.
The flowsheet process was used for complete data sets for both cadmium and manganese in
MW-03A, and is summarized in Table 1. Extreme outliers, as identified in the box and whiskers
plots (Figure 1 and Figure 2), were removed from further analysis and calculation of GWCLs.
Manganese in MW-03A
Figure 1. Box and whisker plot for manganese in MW-03A showing extreme outliers removed from further analysis.
Energy Fuels Resources, Inc.
January 16, 2017
Page 2
Cadmium in MW-03A
Figure 2. Box and whisker plot for cadmium in MW-03A showing extreme outliers removed from further analysis.
Table 1. Flowsheet Summary and Proposed Revised GWCLs
Parameters Cadmium (ug/L)Manganese (ug/L)
N 27 25
Percent Non-detect 11%0%
Mean 1.50 135.66
Standard Deviation 0.75 123.79
Minimum 0.5 15.1
Maximum 3.55 480
Distribution Not normal/lognormal Normal/lognormal
Trend No Trend Decreasing
GWQS 5 800
Highest Historical Value 3.55 480
Mean + 2Sigma 3.00 383.24
Fractional Approach 2.5 400
Existing GWCL 8.3 6287
Proposed Revised GWCL 3.55 383
SIIMTERA
GEOSCIENCE G ENGINEERING SOLUTIONS