DRC-2014-001086 - 0901a068803f6ccd

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ENERGY FUELS
Energy Fuels Resources (USA) Inc.
225 Union Blvd. Suite 600
Lakewood, CO, US, 80228
HPP OC\4A nmnoe 3039742140
Ul\0~^U I *r~UUl 086 www.energyfuels.com
lq JAN 1 4 2014 -]
January 13,2014
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 Source Assessment Report for Gross Alpha in MW-32
White Mesa Mill Groundwater Discharge Permit UGW370004
Conditional Approval of September 20,2013 Plan and Time Schedule
Dear Mr. Lundberg:
Enclosed are two copies of Energy Fuels Resource (USA) Inc.'s ("EFRTs") Source Assessment Report
("SAR") for Gross Alpha in MW-32 at the White Mesa Mill. Gross Alpha in MW-32 exceeded its
Groundwater Compliance Limit ("GWCL") in the first and second quarter of 2013. As required by Part
I.G.4(d) of the Groundwater Discharge Permit ("GWDP"), EFRI submitted a Plan and Time Schedule for the
assessment of Gross Alpha in MW-32 on September 20, 2013. Conditional Approval of the Plan and Time
Schedule was received by EFRI on October 16, 2013. Pursuant to the Plan and Time Schedule EFRI has
prepared this SAR.
This transmittal also includes two CDs each containing a word searchable electronic copy of the report.
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
Dan Hillsten
January 13, 2014
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
Energy Fuels Resources (USA) Inc.
225 Union Blvd. Suite 600
Lakewood, CO, US, 80228
303 974 2140
www .energyfuels.com
Re: Transmittal of Source Assessment Report for Gross Alpha in MW-32
White Mesa Mill Groundwater Discharge Permit UGW370004
Conditional Approval of September 20, 2013 Plan and Time Schedule
Dear Mr. Lundberg:
Enclosed are two copies of Energy Fuels Resource (USA) Inc.'s ("EFRI's") Source Assessment Report
("SAR") for Gross Alpha in MW-32 at the White Mesa Mill. Gross Alpha in MW-32 exceeded its
Groundwater Compliance Limit ("GWCL") in the first and second quarter of 2013. As required by Part
I.G.4(d) of the Groundwater Discharge Permit ("GWDP"), EFRI submitted a Plan and Time Schedule for the
assessment of Gross Alpha in MW-32 on September 20, 2013. Conditional Approval of the Plan and Time
Schedule was received by EFRI on October 16, 2013. Pursuant to the Plan and Time Schedule EFRI has
prepared this SAR.
This transmittal also includes two CDs each containing a word searchable electronic copy of the report.
If you should have any questions regarding this report please contact me.
{~Jt~
ENERGY FUELS RESOURCES (USA) INC.
Kathy Weinel
Quality Assurance Manager
CC: David C. Frydenlund
Harold R. Roberts
David E. Turk
Dan Hillsten
SOURCE ASSESSMENT REPORT
FOR GROSS ALPHA IN MW-32
WHITE MESA URANIUM MILL
Blanding, Utah

Prepared for:
Energy Fuels Resources (USA) Inc.
225 Union Boulevard, Suite 600
Lakewood, CO 80228
Prepared by:

INTERA Incorporated 6000 Uptown Boulevard NE, Suite 220
Albuquerque, New Mexico 87110
January 13, 2014

Source Assessment Report for Gross Alpha in MW-32 White Mesa Uranium Mill
Blanding, Utah ES-i January 13, 2014
EXECUTIVE SUMMARY
This Source Assessment Report (“SAR”) is an assessment of the sources, extent, and potential
dispersion of gross alpha in MW-32 at the White Mesa Uranium Mill (the “Mill”), which has
exhibited two consecutive exceedances of the applicable Groundwater Compliance Limit
(“GWCL”). This report is also an evaluation of potential remedial action to restore and maintain
groundwater quality to ensure that Groundwater Discharge Permit (“GWDP”) limits will not be
exceeded at the compliance monitoring point and that, to the extent applicable, discharge
minimization technology and best available technology will be re-established.
Energy Fuels Resources (USA) Inc. (“EFRI”) believes that the consecutive exceedances of gross
alpha in MW-32 are likely due to background influences and a small and unrepresentative
background data set used to calculate the GWCLs at the time of the Background Reports. Given
the recent analyses in the Background Reports (INTERA, 2007, 2008), the University of Utah
study (Hurst and Solomon, 2008), and other recent analyses and investigations at the site,
including the analyses presented in this SAR, there is no indication that the exceedances of gross
alpha in MW-32 are due to Mill-related impacts or to any potential tailings seepage.
The results of the geochemical analysis of gross alpha in MW-32 demonstrate that the
exceedances in MW-32 can be attributed to natural background. Indicator parameter analysis
demonstrates that there are no significant increasing trends in chloride, fluoride, or sulfate
concentrations, and uranium concentrations are exhibiting a significantly decreasing trend.
Therefore, a revised GWCL has been proposed in this report.

Source Assessment Report for Gross Alpha in MW-32 White Mesa Uranium Mill
Blanding, Utah i January 13, 2014
TABLE OF CONTENTS
EXECUTIVE SUMMARY ........................................................................................................... i
LIST OF TABLES ........................................................................................................................ ii
LIST OF FIGURES ...................................................................................................................... ii
LIST OF APPENDICES .............................................................................................................. ii
ABBREVIATIONS AND ACRONYMS .................................................................................... iii
1.0 INTRODUCTION............................................................................................................. 1
1.1 Source Assessment Report Organization ................................................................ 2
2.0 CATEGORIES AND APPROACH FOR ANALYSIS .................................................. 3
2.1 Approach for Analysis ............................................................................................ 3 2.2 Approach for Setting Revised GWCLs ................................................................... 4
3.0 RESULTS OF ANALYSIS............................................................................................... 5
3.1 Gross Alpha in MW-32 ........................................................................................... 5
3.2 Indicator Analysis ................................................................................................... 5
3.3 Proposed Revised GWCL for Gross Alpha in MW-32 .......................................... 6
4.0 CONCLUSIONS AND RECOMMENDATIONS .......................................................... 6
5.0 REFERENCES .................................................................................................................. 8

Source Assessment Report for Gross Alpha in MW-32 White Mesa Uranium Mill
Blanding, Utah ii January 13, 2014
LIST OF TABLES
Table 1 Plan and Time Schedules and SARs Previously Submitted or in Progress ............ 2
Table 2 Summary of Findings .............................................................................................. 7

LIST OF FIGURES
Figure 1 Location of White Mesa Mill Site

LIST OF APPENDICES
Appendix A GWCL Exceedances for Third Quarter 2013 under the GWDP
Appendix B Geochemical Analysis for Gross Alpha in MW-32
B-1 Geochemical Analysis Summary Table B-2 Comparison of Calculated and Measured TDS for Samples with Complete
Major Ions
B-3 Charge Balance Calculations
B-4 Descriptive Statistics
B-5 Data Used for Statistical Analysis B-6 Data Omitted from Statistical Analysis
B-7 Box Plot
B-8 Histogram
B-9 Linear Regression
Appendix C Geochemical Analysis for Indicator Parameters in MW-32 C-1 Indicator Parameter Analysis Summary Table
C-2 Descriptive Statistics of Indicator Parameters in MW-32
C-3 Data Used for Statistical Analysis
C-4 Data Omitted from Statistical Analysis
C-5 Box Plots for Indicator Parameters in MW-32 C-6 Histograms for Indicator Parameters in MW-32
C-7 Linear Regressions for Lognormally or Normally Distributed Constituents
C-8 Mann-Kendall Analysis for Constituents not Lognormally or Normally
Distributed
Appendix D Time Concentration Plots Compared to Background Report Plots Appendix E Flowsheet (Groundwater Data Preparation and Statistical Process Flow for Calculating Groundwater Protection Standards, White Mesa Mill Site (INTERA, 2007))
Appendix F Input and Output Files (Electronic Only)

Source Assessment Report for Gross Alpha in MW-32 White Mesa Uranium Mill
Blanding, Utah iii January 13, 2014
ABBREVIATIONS AND ACRONYMS
Director Director of the Division of Radiation Control
DRC State of Utah Division of Radiation Control

EFRI Energy Fuels Resources (USA) Inc.
GWCL Groundwater Compliance Limit
GWDP State of Utah Ground Water Discharge Permit UGW370004
GWQS Groundwater Quality Standard
mean + 2σ mean plus two sigma
Mill White Mesa Uranium Mill

pCi/L picocuries per liter
SAR Source Assessment Report

TDS Total Dissolved Solids

USEPA United States Environmental Protection Agency

Source Assessment Report for Gross Alpha in MW-32 White Mesa Uranium Mill
Blanding, Utah 1 January 13, 2014
1.0 INTRODUCTION
Energy Fuels Resources (USA) Inc. (“EFRI”) operates the White Mesa Uranium Mill (the
“Mill”), located near Blanding, Utah (Figure 1), under State of Utah Groundwater Discharge
Permit UGW370004 (the “GWDP”). This is the Source Assessment Report (“SAR”) required
under Part I.G.4 of the GWDP relating to violations of Part I.G.2 of the GWDP with respect to
gross alpha in groundwater at compliance monitoring well MW-32 (Figure 1).
Part I.G.2 of the GWDP provides that out-of-compliance status exists when the concentration of
a constituent in two consecutive samples from a compliance monitoring point exceeds a
groundwater compliance limit (“GWCL”) in Table 2 of the GWDP. The GWDP was originally
issued in March 2005, at which time GWCLs were set on an interim basis, based on fractions of
State of Utah Ground Water Quality Standards (“GWQSs”) or the equivalent, without reference
to natural background at the Mill site. The GWDP also required that EFRI prepare a background
groundwater quality report to evaluate all historical data for the purposes of establishing
background groundwater quality at the site and developing GWCLs under the GWDP. As
required by then Part I.H.3 of the GWDP, EFRI submitted the following to the Director (the
“Director”) of the Utah Division of Radiation Control (“DRC”) (the Director was formerly the
Executive Secretary of the Utah Radiation Control Board and the Co-Executive Secretary of the
Utah Water Quality Board):
• A Revised Background Groundwater Quality Report: Existing Wells for Denison Mines
(USA) Corp.’s Mill Site, San Juan County, Utah, October 2007, prepared by INTERA,
Inc. (the “Existing Wells Background Report”).
• A Revised Addendum: Evaluation of Available Pre-Operational and Regional
Background Data, Background Groundwater Quality Report: Existing Wells for Denison
Mines (USA) Corp.’s Mill Site, San Juan County, Utah, November 16, 2007, prepared by
INTERA, Inc. (the “Regional Background Report”).
• A Revised Addendum: Background Groundwater Quality Report: New Wells for
Denison Mines (USA) Corp.’s Mill Site, San Juan County, Utah, April 30, 2008,
prepared by INTERA, Inc. (the “New Wells Background Report,” and together with the
“Existing Wells Background Report” and the “Regional Background Report,” the
“Background Reports”).
Based on a review of the Background Reports and other information and analyses, the Director
re-opened the GWDP and modified the GWCLs to be equal to the mean concentration plus two
standard deviations or the equivalent. The modified GWCLs became effective on January 20,
2010.

Source Assessment Report for Gross Alpha in MW-32 White Mesa Uranium Mill
Blanding, Utah 2 January 13, 2014
Table 1 summarizes previously submitted Plan and Time Schedules with corresponding SARs in
accordance with the GWDP.
Table 1
Plan and Time Schedules and SARs Previously Submitted or in Progress
Quarter
Plan and Time
Schedule Date SAR date
Q1 2010, Q2 2010, Q3 2010, Q4 2010,
Q1 2011
June 13, 2011 October 10, 2012
Q2 2011 September 7, 2011 October 10, 2012
Q3 2012 December 13, 2012 May 7, 2013
Q4 2012 March 15, 2013 August 30, 2013
Q1 2013 August 27, 2013 December 17, 2013
Q2 2013 September 20, 2013 January 14, 2014
Q3 2013 December 5, 2013 March 20, 2014

On August 23, 2013, EFRI submitted a notice (the “Second Quarter 2013 Exceedance Notice”)
to the Executive Secretary under Part I.G.1(a) of the Permit providing notice that gross alpha
concentrations in MW-32 had exceeded the GWCL for two consecutive sampling events. A Plan
and Time Schedule for the second quarter of 2013 (“Q2 2013 Plan and Time Schedule”)
covering gross alpha in MW-32, which was identified as being in violation of Part I.G.2 of the
Permit, was submitted on September 20, 2013, and approved by DRC in correspondence dated
October 8, 2013. This SAR addresses gross alpha in MW-32 as described in the DRC-approved
Q2 2013 Plan and Time Schedule.
1.1 Source Assessment Report Organization
This SAR follows a similar format to the October 2012 SAR and all previously submitted SARs.
A description of the approach used for analysis is provided in Section 2.0, and the results of the
analysis are presented in Section 3.0. Conclusions and recommendations are reviewed in
Section 4.0, and references are included in Section 5.0.
The appendices consist of the analyses performed for this assessment and are organized in the
following manner: Appendix A contains a table showing exceedances. Appendix B contains the
geochemical analysis performed on gross alpha in MW-32. Appendix C contains the indicator
parameter analysis performed on chloride, fluoride, sulfate, and uranium in MW-32.
Appendix D contains data plots for gross alpha and indicator parameters in MW-32 using all
available data to date compared to the data plots from the Background Reports. Appendix E
contains the Flowsheet developed based on the United States Environmental Protection

Source Assessment Report for Gross Alpha in MW-32 White Mesa Uranium Mill
Blanding, Utah 3 January 13, 2014
Agency’s (“USEPA”) Statistical Analysis of Groundwater Monitoring Data at RCRA Facilities,
Unified Guidance (USEPA, 2009), and was approved by DRC prior to completion of the
Background Reports. Appendix F is included on the compact disc that accompanies this SAR
and contains the electronic input and output files used for statistical analysis.
2.0 CATEGORIES AND APPROACH FOR ANALYSIS
Generally, out-of-compliance constituents and wells can be grouped into five categories:
1. Constituents in wells with previously identified rising trends.
2. Constituents in pumping wells.
3. Constituents potentially impacted by decreasing trends in pH across the site.
4. Newly installed wells with interim GWCLs.
5. Other constituents and wells.
This SAR addresses one constituent in one well (gross alpha in MW-32), which falls into
category five. MW-32 was installed in 2002, at which time a limited round of sampling and
analysis was completed. In 2005, quarterly sampling and analysis of the well began. In 2007, at
the time of the background evaluation for MW-32, there was a relatively small amount of data
for MW-32 (around eight data points for most constituents). Since the time of the Background
Reports, data have continued to be collected, with 42 sample results for gross alpha in MW-32
available at the time of this SAR.
2.1 Approach for Analysis
The first step in the analysis is to perform an assessment of the potential sources for gross alpha
to determine whether the exceedance is due to background influences or Mill activities. If the
exceedance is determined to be caused by background influences, then it is not necessary to
perform any further evaluations on the extent and potential dispersion of the contamination or to
perform an evaluation of potential remedial actions. Monitoring will continue, and where
appropriate, a revised GWCL will be proposed to reflect changes in background conditions at the
site.
Background at the Mill site was recently thoroughly studied in the Background Reports and in
the University of Utah Study (Hurst and Solomon, 2008). Both the Background Reports and the
University of Utah Study concluded that groundwater at the site has not been impacted by Mill
operations. Although MW-32 was not analyzed in the University of Utah study, the research was
conducted on wells carefully selected to represent groundwater at the site. The University of

Source Assessment Report for Gross Alpha in MW-32 White Mesa Uranium Mill
Blanding, Utah 4 January 13, 2014
Utah study concluded that the majority of groundwater at the site is older than the age of the Mill
(Hurst and Solomon, 2008), indicating no mill-related impacts to groundwater. Both of those
studies also acknowledged that there are natural influences at play at the site that have given rise
to increasing trends and general variability of background groundwater at the site.
As discussed in detail in Section 9.0 of the Existing Wells Background Report, chloride is the
best indicator of potential tailings cell seepage, followed by fluoride and then sulfate (due to
mobility and abundance in tailings). Uranium is probably the most mobile of trace (metal)
elements and is the best indicator parameter for metals and radionuclides. Any potential seepage
from tailings impoundments would be expected to exhibit rising concentrations of chloride
followed by fluoride, sulfate, and uranium. While uranium may be the most mobile of trace
(metal) elements, it is typically retarded behind chloride, fluoride, and sulfate, and would likely
not be expressed in groundwater until sometime after chloride, fluoride, and sulfate
concentrations had begun to rise. This is because uranium is a metal cation and behaves as other
metals with respect to pH. It is important to note, however, that while the absence of a rising
trend in chloride would indicate that there has been no impact from tailings, a rising trend in
chloride, as well as in other indicator parameters, could also be due to natural influences (see
Section 12.0 of the Existing Wells Background Report). Therefore, in situations where there is a
significant rising trend in chloride or in other indicator parameters, other evaluations would need
to be performed regarding the behavior of the other indicator parameters and whether or not the
concentrations and mass balance indicate potential tailings cell seepage.
The assessment of potential sources of gross alpha in MW-32 was accomplished by performing a
geochemical analysis to evaluate the behavior of the constituents in the well to determine if there
have been any changes in the behavior of indicator parameters, such as chloride, sulfate, fluoride,
and uranium, since the date of the Background Reports that may suggest a change in the
groundwater conditions at that well. The geochemical analysis of gross alpha and the indicator
parameters in MW-32 was supported by a statistical analysis that followed the process outlined
in the Groundwater Data Preparation and Statistical Process Flow for Calculating
Groundwater Protection Standards, White Mesa Mill Site, San Juan County, Utah (“Flowsheet”)
(INTERA, 2007), a copy of which is attached as Appendix E. The Flowsheet was designed
based on USEPA’s Statistical Analysis of Groundwater Monitoring Data at RCRA Facilities,
Unified Guidance (USEPA, 2009), and was approved by DRC prior to completion of the
Background Reports.
2.2 Approach for Setting Revised GWCLs
If the foregoing approach results in the conclusion that the previous analysis in the Background
Reports has not changed, or that the out-of-compliance status of gross alpha in MW-32 is due to

Source Assessment Report for Gross Alpha in MW-32 White Mesa Uranium Mill
Blanding, Utah 5 January 13, 2014
natural variations in background conditions that were not captured in the small data-set at the
time of the Background Reports, then a new GWCL will be proposed for the constituent in
accordance with the DRC-approved Flowsheet.
3.0 RESULTS OF ANALYSIS
This section describes the results of the analysis, summaries of which are provided in
Appendix B-1, Appendix C-1, and Appendix D.
3.1 Gross Alpha in MW-32
Gross alpha concentrations collected from MW-32 between 2002 and July of 2013 were
analyzed following the steps outlined in the Flowsheet. Data used in the analysis are presented in
Appendix B-5 and as input files included in Appendix F (electronic-only). Two results were
removed from the analysis (Appendix B-6) due to an insensitive detection limit and an extreme
outlier identified in the box and whisker plot (Appendix B-7), which was likely the result of a
decimal transcription error, leaving 42 individual results for gross alpha in MW-32. Gross alpha
concentrations in MW-32 are normally or lognormally distributed (Appendix B-8) and do not
exhibit a significantly increasing trend (Appendix B-9). Appendix D presents linear regression
plots for gross alpha in MW-32 at the time of the Background Reports and at the time of this
SAR. At the time of the Background Reports, eight individual results were used, distribution was
normal, and there was a downward trend. Although the trend line in the most recent plot appears
to be increasing, the fit to the line is poor (r2= 0.0387), and the p value is greater than 0.05,
indicating that the apparent trend is not significant at the 95% confidence level. The differences
noted in the Background Reports data set and the current SAR data set can be attributed to the
increase in the data sets used for analysis.
3.2 Indicator Analysis
A summary of the Flowsheet analysis for indicator parameters is presented in Appendix C-1.
Appendix C-2 presents the descriptive statistics for the indicator parameters. Data used in the
analysis is presented in Appendix C-3, while data omitted from analysis are presented in
Appendix C-4. Graphs used in the analyses presented in Appendix C-5 include: box and
whisker plots used to identify extreme outliers, histograms and the Shapiro-Wilk test used to
determine distribution, and linear regression plots used to identify significant trends in normally
or lognormally distributed data; however, plots are included for all parameters regardless of their
distribution. Mann-Kendall trend analyses for parameters that were not normally or lognormally
distributed are included in Appendix C-8. Chloride, fluoride, and sulfate concentrations in
MW-32 are not exhibiting significant trends. Uranium is exhibiting a significantly decreasing

Source Assessment Report for Gross Alpha in MW-32 White Mesa Uranium Mill
Blanding, Utah 6 January 13, 2014
trend. A comparison of current indicator parameter plots with plots from the Background Reports
(Appendix D) shows that there are some differences in the two sets of plots. Linear regression
plots for chloride show a decreasing trend at the time of the Background Reports, compared to a
slightly increasing trend at the time of this SAR. Conversely, sulfate concentrations were
significantly increasing at the time of the Background Reports, while at the time of this SAR, the
trend line is slightly decreasing. The differences in the plots are most likely caused by the small
data sets at the time of the Background Reports, which did not fully capture the background
conditions in MW-32. The differences in the plots also highlight the dynamic and variable
groundwater system that is naturally occurring at the site. Indicator parameter analysis results
support the conclusion of the gross alpha analysis that the groundwater conditions in this well are
not consistent with potential tailings cell seepage.
3.3 Proposed Revised GWCL for Gross Alpha in MW-32
The reasons discussed above support the conclusions that (1) MW-32 is not being impacted by
any potential tailings cell seepage, and (2) gross alpha concentrations in MW-32 are the result of
background that was not fully captured in the small sample size used for background analysis. A
new GWCL for gross alpha is therefore proposed as follows:
• MW-32: The current GWCL is 3.33 picocuries per liter (pCi/L). In accordance with the
Flowsheet, the proposed revised GWCL is 7 pCi/L, which is the mean + 2σ, based on all
data available to date.
It should be noted that the proposed revised GWCL for gross alpha in MW-32 is lower than the
fractional approach for Class III wells (7.5 pCi/L) and the GWQS (15 pCi/L), which are both
protective of human health and the environment.
4.0 CONCLUSIONS AND RECOMMENDATIONS
Background groundwater conditions at the Mill site were recently thoroughly studied in the
Background Reports and in the University of Utah Study. Both the Background Reports and the
University of Utah Study concluded that groundwater at the site has not been impacted by Mill
operations. Both of those studies also acknowledged that there are natural influences at play at
the site that have given rise to increasing trends and general variability of background
groundwater conditions at the site.
The focus of this SAR was therefore to identify any changes in the circumstances identified in
those studies. A geochemical analysis for the indicator parameters in MW-32 was performed.
The results of the analysis show that the exceedances of gross alpha in MW-32 are not due to
potential tailings cell seepage. This is evident from the behavior of indicator parameters in

Source Assessment Report for Gross Alpha in MW-32 White Mesa Uranium Mill
Blanding, Utah 7 January 13, 2014
MW-32, which are not showing any significant upward trends. As a result, INTERA concludes
that the exceedances of gross alpha in MW-32 are due to the small sample size of the data used
at the time of the Background Reports. Table 2 summarizes the findings of this analysis.
Table 2
Summary of Findings
Well
Out-of-Compliance
Constituent
Summary Path Forward
MW-32 Gross Alpha
GWCLs set at the time of the Background Reports used limited data not fully
representative of natural background. Geochemical analysis of gross alpha and
indicator parameters conclude there has been no impact from tailings seepage.
Revise GWCL using all available data to accurately reflect background
conditions.

A revised GWCL has been proposed. If this GWCL is approved, EFRI assumes that upon the
published GWDP revision, accelerated monitoring for gross alpha in MW-32 will cease.

Source Assessment Report for Gross Alpha in MW-32 White Mesa Uranium Mill
Blanding, Utah 8 January 13, 2014
5.0 REFERENCES
Energy Fuels Resources (USA) Inc. (EFRI), 2010-2013. White Mesa Uranium Mill Groundwater
Monitoring Reports
––––––. 2009-2013. White Mesa Uranium Mill Nitrate Monitoring Reports.
Hurst, T.G., and Solomon, D.K., 2008. Summary of Work Completed, Data Results, Interpretations and Recommendations for the July 2007 Sampling Event at the Denison
Mines, USA, White Mesa Uranium Mill Near Blanding Utah. Prepared by Department of
Geology and Geophysics, University of Utah.
INTERA Inc., 2007. Revised Background Groundwater Quality Report: Existing Wells For Denison Mines (USA) Corp.’s White Mesa Mill Site, San Juan County, Utah.
––––––. 2008. Revised Addendum Background Groundwater Quality Report: New Wells for
Denison Mines (SA) Corp’s White Mesa Mill Site, San Juan County, Utah.
Shapiro, S.S., and Wilk, M.B., 1965. An Analysis of Variance Test for Normality (Complete
Samples). Biometrika 52:591-611.
United States Environmental Protection Agency (USEPA), 2009. Statistical Analysis of Groundwater Monitoring Data at RCRA Facilities, Unified Guidance, EPA 530/R-09-
007.

FIGURES

Cell No. 1
Cell No. 2
Cell No. 3
Cell No. 4A
W i l d l i f e P o n d
W i l d l i f e P o n d

Mill Site
Cell No. 4B
MW-37
MW-36
MW-35
MW-34MW-33
MW-31
MW-30
MW-29
MW-28
MW-27
MW-26
MW-25
MW-24
MW-23
MW-22
MW-21
MW-20
MW-19
MW-18
MW-17
MW-15
MW-14
MW-12
MW-11
MW-05
MW-04
MW-03
MW-02
MW-01
MW-03A
MW-32
S : \ P r o j e c t s \ I U C - 0 0 1 - 0 1 - 0 0 1 D e n i s o n M i n e s \ G I S \ m a p d o c s \ 2 0 1 3 _ S A R s \ M W - 3 2 _ J a n u a r y 2 0 1 4 \ F i g 0 1 _ L o c M a p _ M W 3 2 . m x d D a t e : 1 / 1 0 / 2 0 1 4
F i g u r e 1 L o c a t i o n o f W h i t e M e s a M i l l S i t e W h i t e M e s a U r a n i u m M i l l
1 , 0 0 0 0 1 , 0 0 0 5 0 0
F e e t
S o u r c e ( s ) : A e r i a l N A I P U t a h 2 0 1 1 ; W e l l s H G C , I n c . , M a y 2 0 0 8 r e p o r t .
L e g e n d
G r o u n d w a t e r M o n i t o r i n g W e l l s
U T A H U T A H
W h i t e M e s a U r a n i u m M i l l

APPENDIX A
GWCL Exceedances for Third Quarter 2013
under the GWDP
APPENDIX A
GWCL Exceedances for Third Quarter 2013 Under the August 24, 2012 GWDP
Page 1 of 8
Appendix A
Source Assessment Report for Gross Alpha in MW-32
White Mesa Uranium Mill
Monitoring Well
(Water Class)
Constituent Exceeding
GWCL
GWCL in
August 24, 2012
GWDP
Q1 2010
Sample Date
Q1 2010
Result
Q2 2010
Sample Date
Q2 2010
Result
May 2010
Monthly
Sample Date
May 2010
Monthly
Result
June 2010
Monthly
Sample Date
June 2010
Monthly
Result
July 2010
Monthly
Sample Date
July 2010
Monthly
Result
August 2010
Monthly
Sample Date
August 2010
Monthly Result
Q3 2010
Sample Date
Q3 2010
Result
October 2010
Monthly
Sample Date
October 2010
Monthly
Result
Q4 2010
Sample Date
Q4 2010
Result
December 2010
Monthly
Sample Date
December 2010
Monthly Result
Field pH (S.U.)6.5 - 8.5 7.34 7.22 7.29 8.21 7.51 7.32 8.34 7.49 7.44 7.37
Manganese (ug/L)131.29 134 137 122 99 123 138 128 141 133 158
Manganese (ug/L)2230.30 2060 2070 NA NA NA NA 1920 NA 1980 NA
Field pH (S.U.)6.5 - 8.5 6.45 6.29 6.36 6.45 7.19 6.48 6.51 6.60 6.37 6.47
Field pH (S.U.)6.5 - 8.5 6.53 7.2 NA NA NA NA 6.58 NA 6.36 NA
Cadmium (ug/L)1.5 1.26 1.44 NA NA NA NA 1.4 NA 1.26 NA
Chloride (mg/L)35 31 31 NA NA NA NA 31 NA 31 NA
Fluoride (mg/L)0.42 0.31 0.33 NA NA NA NA 0.34 NA 31 NA
Uranium 6.5 5.93 6.43 NA NA NA NA 6.57 NA 5.89 NA
Nitrate + Nitrite (as N) 0.62 1.3 2 0.3 0.4 0.6 0.6 0.7 0.4 0.2 0.4
Uranium (ug/L)41.8 58.7 66.7 37.4 36.6 34.4 71.8 72.7 37.5 30.4 29.6
Chloroform (ug/L)70 700 1700 800 940 900 2800 2100 1000 1900 1400
Chloride (mg/L)58.31 72 57 80 47 52 49 64 52 48 52
Field pH (S.U.)6.74 - 8.5 6.59 7.18 6.36 6.98 6.45 6.39 6.60 6.61 6.49 6.45
Dichloromethane (Methylene Chloride) (ug/L)5 1 9.9 NR 2.2 12 24 45 5.5 16 1.2
Nitrate + Nitrite (as N) 2.5 16.1 15.8 17 15.3 7/21/2010 16 8/24/2010 16 15 15 15 16
Chloride (mg/L)128 127 97 NS NS NS NS NS NS 111 NS 126 NS
Uranium (ug/L)8.32 6.82 6.82 NS NS NS NS NS NS 7.10 NS 6.64 NS
Selenium (ug/L)34 32 35.3 NS NS 7/27/2010 33.5 8/24/2010 35.6 32.6 32.4 32.2 30.5
Nitrate + Nitrite (as N) 5 21.7 22.5 5/21/2010 23 6/15/2010 21.1 7/21/2010 20 8/24/2010 22 21 10/19/2010 20 20 20
TDS (mg/L)1320 1150 1220 NS NA NS NA NS NA NS NA 1330 NS NA 1320 NS
Chloride (mg/L)143 128 128 NS NA NS NA NS NA NS NA 139 NS NA 138 NS
Selenium (ug/L)71 60.8 59.6 NS NA NS NA NS NA NS NA 64.4 NS NA 60 NS
Field pH (S.U.)6.5 - 8.5 6.96 7.38 5/21/2010 6.95 6/15/2010 7.01 7/21/2010 7.80 8/24/2010 7.10 7.66 (7.13)10/19/2010 6.92 6.98 6.95
Sulfate (mg/L)532 507 522 NS NA NS NA NS NA NS NA 527 NS NA 539 NS
Manganese (ug/L)200 NA NA NA NA NA NA NA NA 698 NA
Thallium (ug/L)0.5 NA NA NA NA NA NA NA NA 1.14 NA
Molybdenum (ug/L)10 NA NA NA NA NA NA NA NA <10 NA
Gross Alpha minus Rn & U
(pCi/L)3.75 NA NA NA NA NA NA NA NA 2.6 NA
Selenium (ug/L)12.5 NA NA NA NA NA NA NA NA ND NA
Uranium (ug/L)7.5 NA NA NA NA NA NA NA NA 27.2 NA
Manganese (ug/L)289 NA 212 NA NA NA NA NA NA 275 NA
Tetrahydrofuran (ug/L)11.5 NA 7.8 NA NA NA NA NA NA 10.7 NA
Sulfate (mg/L)838 NA 805 NA NA NA NA NA NA 792 NA
Selenium (ug/L)37 NA 37.2 NA NA NA NA 35.5 NA 38.8 NA
Field pH (S.U.)6.5 - 8.5 NA 6.14 (6.25)NA NA NA NA 6.39 NA 6.35 NA
Fluoride (Mg/L)0.68 NA 0.71 NA NA NA NA 0.63 NA 0.77 NA
Field pH (S.U.)6.5 - 8.5 NA 6.23 (6.24)NA NA NA NA 6.42 NA 6.21 NA
Sulfate (mg/L)3640 NA 3680 NA NA NA NA 3630 NA 3850 NA
Nitrate + Nitrite (as N) 1.3 NA 1.0 NA NA NA NA NA NA 1.2 NA
TDS (mg/L)5805 NA 5860 NA NA NA NA 5470 NA 5330 NA
Selenium (ug/L)89 NA 81.4 NA NA NA NA NS NA 94.8 NA
MW-05 (Class II)Uranium (ug/L)7.5 NS NA 4/26/2010 0.39 NS NA NS NA NS NA NS NA NS NA NS NA 11/11/2010 11.6 NS NA
Field pH (S.U.)6.5 - 8.5 NA 7.16 NA NA NA NA 6.62 NA 6.47 NA
Selenium (ug/L)25 NA 25.7 NA NA NA NA 31.9 NA 27.6 NA
Selenium (ug/L)128.7 NA 100 NA NA NA NA NA NA 99.5 NA
Iron (ug/L)81.7 NA ND NA NA NA NA NA NA ND NA
Thallium (ug/L)1.95 NA 3.73 NA NA NA NA 3.64 NA 3.57 NA
Sulfate (mg/L)1938.9 NA 1950 NA NA NA NA 1930 NA 1910 NA
Field pH (S.U.)6.25-8.5 NA 6.2 NA NA NA NA 7.23 NA 6.37 NA
TDS (mg/L)3198.77 NA 3280 NA NA NA NA 3190 NA 3030 NA
11/11/2010 12/15/10MW-11 (Class II)2/10/2010 4/28/2010 5/24/2010 6/16/2010 7/20/2010 8/25/2010 9/8/2010 10/20/2010
Required Quarterly Sampling Wells
Q2 2010 Results Q3 2010 Results Q4 2010 ResultsQ1 2010 Results
9/8/2010 10/20/2010
NS NS NS NS NS
11/10/2010 12/15/2010
NS NS NS
NS
9/20/2010 11/19/2010
MW-15 (Class III)4/21/2010
MW-31 (Class III) 2/9/2010 4/20/2010 9/13/2010 (9/21/10)11/9/2010 12/14/2010
NS
NS NS
NS
NS
NS
NS
NS
NS
NS
MW-18 (Class III)5/4/2010 9/15/2010 11/18/2010NSNSNS
4/28/2010 9/8/2010 11/10/2010
NS
NS
NS
NS
Required Semi-Annual Sampling Wells
MW-03 (Class III)5/3/2010
NS
NS
11/30/2010
MW-14 (Class III)2/2/2010 4/21/2010 5/21/2010 6/16/2010 7/20/2010 8/25/2010
MW-35 (Class II)NS NS NS NS NS NS
MW-26 (Class III)2/2/2010 4/22/2010 5/21/2010 6/16/2010 7/21/2010 8/16/2010
MW-25 (Class III) 2/3/2010
MW-30 (Class II)
NS
NS
NSMW-01 (Class II)5/5/2010 11/18/2010NS
NS
NS
NS
NS
NS
NS
NS
NS
MW-3A (Class III)5/4/2010 9/21/2010 11/22/2010
NS 11/11/2010
MW-12 (Class III)4/27/2010 9/20/2010
NS
NS
NS
NS
NS
11/19/2010
NS
NS
NS
NS
11/15/2010 12/15/2010
11/9/2010 12/14/2010
9/26/2010 10/20/2010
2/9/2010 4/27/2010 5/21/2010 6/15/2010 9/14/2010 10/19/2010
NS
NS
APPENDIX A
GWCL Exceedances for Third Quarter 2013 Under the August 24, 2012 GWDP
Page 2 of 8
Appendix A
Source Assessment Report for Gross Alpha in MW-32
White Mesa Uranium Mill
Monitoring Well
(Water Class)
Constituent Exceeding
GWCL
GWCL in
Current GWDP
Q1 Sample
Date Q1 Result Q2 Sample
Date Q2 Result
May
Monthly
Sample Date
May
Monthly
Result
June Monthly
Sample Date
June Monthly
Result
July Monthly
Sample Date
July Monthly
Result
August
Monthly
Sample Date
August Monthly
Result
Q3 Sample
Date Q3 Result
October
Monthly
Sample Date
October
Monthly
Result
Q4 Sample
Date Q4 Result
December
Monthly
Sample Date
December
Monthly Result
Field pH (S.U.)6.78-8.5 NA 6.61 (6.66)NA NA NA NA 6.93 NA 6.8 NA
Gross Alpha minus Rn & U
(pCi/L)2.36 NA 0.9 NA NA NA NA NA NA 1.2 NA
Nitrate + Nitrite (as N) 2.83 NA 2.6 NA NA NA NA NA NA 2.4 NA
Field pH (S.U.)6.5 - 8.5 NA 6.18 NA NA NA NA 7.05 NA 6.44 NA
Manganese (ug/L)550 NA 184 NA NA NA NA NS NA 65 NA
Cadmium (ug/L)2.5 NA 4.28 NA NA NA NA 5.06 NA 3.22 NA
Fluoride (Mg/L)0.36 NA 0.14 NA NA NA NA NA NA 0.18 NA
Thallium (ug/L)1 NA 1.3 NA NA NA NA 1.57 NA 1.09 NA
Field pH (S.U.)6.5 - 8.5 NA 5.91 (5.78)NA NA NA NA 6.64 NA 6.1 NA
Nitrate + Nitrite (as N) 5.6 NA 5.8 NA NA NA NA 5.9 NA 5.7 NA
Chloride (mg/L)38 NA 42 NA NA NA NA 42 NA 45 NA
Sulfate (mg/L)462 NA 469 NA NA NA NA 461 NA 452 NA
Field pH (S.U.)6.5-8.5 NA 6.78 NA NA NA NA 7.68 NA 6.89 NA
TDS (mg/L)1075 NA 1160 NA NA NA NA 1060 NA 1110 NA
Gross Alpha minus Rn & U (pCi/L)2 NA 1.6 NA NA NA NA NA NA 2.4 NA
Chloride (mg/L)105 NA 108 NA NA NA NA 106 NA 107 NA
Manganese (ug/L)1837 NA 1550 NA NA NA NA NA NA 1510 NA
Field pH (S.U.)6.1 - 8.5 NA 5.67 NA NA NA NA 5.91 NA 5.72 NA
Iron (ug/L)1869 NA 1630 NA NA NA NA NA 1490 NA
Manganese (ug/L)5624 NA 4820 NA NA NA NA NA 4890 NA
TDS (mg/L)4400 NA 4400 NA NA NA NA NA 4390 NA
Field pH (S.U.)6.46 - 8.5 NA 6.82 NA NA NA NA NA 6.17 NA
Gross Alpha minus Rn & U (pCi/L)3.33 NA 4.5 NA NA NA NA 2.9 NA 8.8 NA
Field pH (S.U.)6.4 - 8.5 NA 6.03 NA NA NA NA 6.33 NA 6.05 NA
Notes:
Values in () parentheses are the field pH measurements for the resampled analyses.
MW-19 (Class III)5/4/2010 9/15/2010 11/18/2010NS
NS
NS
NS
NS
NS
MW-27 (Class III)5/3/2010 9/14/2010
NS
11/12/2010
MW-24 (Class III)5/6/2010 9/21/2010 11/17/2010
NS
MW-23 (Class III)4/22/2010 9/14/2010 11/22/2010
MW-29 (Class III)4/27/2010 NS NA 11/9/2010
MW-28 (Class III)4/19/2010 11/12/2010NS
NS
Exceedances are shown in yellow.
NS = Not Required and Not Sampled
NR = Required and Not Reported
NA = Not Applicable
MW-32 (Class III)4/20/2010 9/13/2010 11/10/2010NSNS NS
GWCL values are taken from August 24, 2012 version of GWDP.
NS
NS
NS
Required Semi-Annual Sampling Wells, continued
Q1 2010 Results
NS
NS
NS
NSNS
NS
NS
NS
NS
NS
Q2 2010 Results
NS
NS
NS
NS
NS
NS
NS
NS
NSNS
Q3 2010 Results
NS
NS
NS
9/14/2010 NS
NS
NS
NS
NS
NS
NS
NS
NS
Q4 2010 Results
NS
APPENDIX A
GWCL Exceedances for Third Quarter 2013 Under the August 24, 2012 GWDP
Page 3 of 8
Appendix A
Source Assessment Report for Gross Alpha in MW-32
White Mesa Uranium Mill
Monitoring
Well (Water
Class)
Constituent Exceeding
GWCL
GWCL in
August 24,
2012 GWDP
January 2011
Monthly
Sample Date
January 2011
Monthly Sample
Result
Q1 2011
Sample
Date
Q1 2011
Result
March 2011
Monthly
Sample Date
March 2011
Monthly
Result
Q2 2011
Sample
Date
Q2 2011
Result
May 2011
Monthly
Sample Date
May 2011
Monthly
Result
June 2011
Monthly
Sample Date
June 2011
Monthly
Result
July 2011
Monthly
Sample Date
July 2011
Monthly
Result
Q3 2011
Sample
Date
Q3 2011
Result
September 2011
Monthly
Sample Date
September
2011 Monthly
Result
Q4 2011
Sample Date
Q4 2011
Result
November
2011 Monthly
Sample Date
November
2011 Monthly
Result
December
2011 Monthly
Sample Date
December 2011
Monthly
Result
Field pH (S.U.)6.5 - 8.5 7.43 7.47 7.94 7.50 7.25 6.86 7.07 7.25 7.29 7.52 7.47 7.88
Manganese (ug/L)131.29 121 145 68 148 170 121 151 118 106 112 105 100
Manganese (ug/L)2230.30 NA 2020 NA 2140 NA NA NA 1990 NA 1960 NA NA
Field pH (S.U.)6.5 - 8.5 6.37 6.22 6.76 6.63 6.37 5.83 6.4 6.23 6.50 6.71 (6.82)6.63 6.84
Field pH (S.U.)6.5 - 8.5 6.44 6.66 6.79 6.7 6.1 5.77 6.29 8/3/2011 6.42 6.54 6.6 6.51 6.87
Cadmium (ug/L)1.5 NA 1.34 NA 1.27 NA NA NA 8/30/2012 1.19 NA 1.27 NA NA
Chloride (mg/L)35 NA 30 NA 31 NA NA NA 32 NA 32 NA NA
Fluoride (mg/L)0.42 NA 0.31 NA 0.28 NA NA NA 0.31 NA 0.32 NA NA
Uranium 6.5 7.02 4.77 6.8 5.56 6.72 7.06 6.74 6.37 5.96 5.27 6.56 6.1
Nitrate + Nitrite (as N) 0.62 0.2 0.25 0.6 0.8 0.4 0.3 0.9 0.6 2.4 0.9 1.3 2.3
Uranium (ug/L)41.8 32 69.3 31.8 60.2 57.4 18.5 57.1 19.0 56.1 58.9 55.6 57
Chloroform (ug/L)70 800 730 1200 390 1900 730 300 1000 1300 440 1200 1400
Chloride (mg/L)58.31 52 59 64 64 54 39 64 60 66 61 55 62
Field pH (S.U.)6.74 - 8.5 6.83 6.06 6.89 6.22 6.43 6.52 6.35 6.07 6.71 6.82 6.75 7.1
Dichloromethane
(Methylene Chloride) 5 <1.0 10 14 3.1 20 7 2.4 10 7.9 2.6 8.9 11
Nitrate + Nitrite (as N) 2.5 15 16 17 16 16 17 17 14 16 16 16 16
Chloride (mg/L)128 NS 134 NS 134 128 127 127 126 145 129 122 124
Uranium (ug/L)8.32 NS 5.97 NS 6.49 NS NS NS 8 NS 9.83 NS NS
Selenium (ug/L)34 36.2 34.7 34 44.4 38.3 38.7 32.4 39.7 32.4 36.6 36.8 38
Nitrate + Nitrite (as N) 5 19 21 22 21 20 22 22 20 21 21 21 21
TDS (mg/L)1320 1240 1220 1250 1370 1290 1330 1280 1300 1300 1320 1290 1330
Chloride (mg/L)143 NS 145 NS 143 143 145 148 148 148 145 145 148
Selenium (ug/L)71 NS 64.6 NS 65.2 NS NS NS 66.2 NS 68.8 NS NS
Field pH (S.U.)6.5 - 8.5 6.65 7.21 7.43 7.01 6.73 6.16!6.64 6.67 7.03 7.28 7.01 (7.34)7.46
Sulfate (mg/L)532 NS 538 531 503 512 540 532 537 541 539 552 530
Manganese (ug/L)200 NA 248 NA 369 NA NA 348 267 270 271 283 247
Thallium (ug/l)0.5 NA < 0.50 NA < 0.50 NA NA NA 0.52 NA 0.57 < 0.50 0.63
Molybdenum (ug/L)10 NA <10 NA <10 NA NA NA <10 NA <10 NA NA
Gross Alpha minus Rn
& U (pCi/L)3.75 NA 2.6 NA 3.7 NA NA NA 4.5 NA 4.4 4.7 4.2
Selenium (ug/L)12.5 NA ND NA ND NA NA NA 9.3 NA 10.5 NA NA
Uranium (ug/L)7.5 NA 12.7 NA 21.7 NA NA 24.2 18.3 22.3 20.1 24 23.6
Manganese (ug/L)289 NA NA NA 4/11/2011 218 NA NA NA NA NA 206 NA NA
Tetrahydrofuran (ug/L)11.5 NA NA NA 4/19/2011 10.7 NA NA NA NA NA 7.82 NA NA
Sulfate (mg/L)838 NA NA NA 4/11/2011 704 NA NA NA NA NA 713 NA NA
Selenium (ug/L)37 NA 40.5 NA 45.4 NA NA NA 46 NA 46.7 NA NA
Field pH (S.U.)6.5 - 8.5 NA 6.09 NA 6.46 NA NA NA 6.32 NA 6.53 (6.83)NA NA
Fluoride (Mg/L)0.68 NA 0.69 NA 0.68 NA NA NA 0.96 NA 0.91 NA NA
Field pH (S.U.)6.5 - 8.5 NA 6.05 NA 6.58 NA NA NA 6.19 NA 6.5 (6.92)NA NA
Sulfate (mg/L)3640 NA 3730 NA 3350 NA NA NA 3560 NA 3750 NA NA
Nitrate + Nitrite (as N) 1.3 NA NA NA 1.2 NA NA NA NA NA 1.1 NA NA
TDS (mg/L)5805 NA 5770 NA 5720 NA NA NA 5810 NA 5630 NA NA
Selenium (ug/L)89 NA 99 NA 85.8 NA NA NA 88.5 NA 95 NA NA
MW-05
Uranium (ug/L)7.5 NS NA 2/14/2011 29.5 NS NA 4/12/2011 7.16 NS NA NS NA NS NA 8/9/2011 0.5 NS NA 10/10/2011 4.52 NS NA NS NA
Field pH (S.U.)6.5 - 8.5 NA 6.43 NA 6.67 NA NA NA 6.13 NA 6.7 (6.97)NA NA
Selenium (ug/L)25 NA 39 NA 21.7 NA NA NA 25.4 NA 35.4 NA NA
Selenium (ug/L)128.7 NA NA NA 116 NA NA NA NS NA NA 112 NA NA
Iron (ug/L)81.7 NA NA NA <0.50 NA NA NA NS NA NA 137 NA NA
Thallium (ug/l)1.95 NA 3.49 NA 3.74 NA NA NA 4.0 3.39 NA 3.83 NA NA
Sulfate (mg/L)1938.9 NA 1770 NA 1780 NA NA NA 1910 NA 2020 NA NA
Field pH (S.U.)6.25-8.5 NA 6.27 NA 6.71 NA NA NA 5.95 NA 6.55 (6.63)NA NA
TDS (mg/L)3198.77 NA 3250 NA 3250 NA NA NA 3190 NA 3220 NA NA
7/6/2011 8/3/2011
8/30/11 9/7/2011 10/4/2011 11/9/2011 12/14/2011MW-11
(Class II)1/11/2011 2/2/2011 3/15/2011 4/4/2011 5/10/2011 6/15/2011
Q4 2011 Results
Required Quarterly Sampling Wells
Q1 2011 Results Q2 2011 Results Q3 2011 Results
6/20/2011 7/6/2011 9/7/2011 10/12/2011 11/9/2011
9/7/2011
12/12/201111/9/20117/5/2011 8/3/2011 9/8/2011
3/15/2011 4/4/2011 5/11/2011
5/10/2011 6/15/2011
8/3/2011
MW-14 (Class III)1/11/2011 2/7/2011 3/14/2011 4/4/2011
8/3/2011 9/7/2011 10/4/2011 11/8/20111/10/2011 2/1/2011
6/20/2011 7/5/2011 8/2/2011 9/6/2011 10/3/2011 11/8/2011 (11/29/12)
MW-18
(Class III)2/15/2011
8/30/2011
3/14/2011 4/1/2011 5/10/2011
6/20/2011 7/6/2011
NS
NS
NS
6/20/2011 7/5/2011
MW-25
(Class III) 1/11/2011 2/2/2011
Required Semi-Annual Sampling Wells
NS
NS
NS
NS
NS
MW-03
(Class III)
9/7/11
10/11/2011
8/9/2011 10/6/2011
4/13/2011 8/11/2011 10/11/2011
NS NS
NSNS
NS
NS
NS4/5/2011
2/16/2011
2/15/2011 4/13/2011 8/10/2011 10/10/2011
10/4/2011 11/9/2011 12/12/2011
12/12/2011
7/20/11
10/4/2011
MW-01
(Class II)NS
NS
NS
NS
NS
NS
NS
NS
NS
NS
NS
NS
NS
NS
MW-30
(Class II)
2/15/2011
MW-03A
(Class III)
MW-15
(Class III)
MW-12
(Class III)
4/6/2011
NSNS
NSNS
4/12/2011NS
NS
NS
NS
NS
NS
NS8/10/2011
9/21/11 10/11/2011
NS NS
NS
NS
NS
NS
NS
NS
NS
10/10/2011 NS
MW-26
(Class III)1/12/2011 2/16/2011 3/15/2011 4/1/2011 5/10/2011
3/14/2011 4/11/2011 5/10/2011
NS NS
NS
NS
8/3/2011
8/30/11
NS
10/3/11 11/8/2011 12/14/11
12/12/2011
MW-35
(Class II)2/15/2011 6/7/2011
MW-31 (Class III) 1/10/2011 2/1/2011
12/14/2011
APPENDIX A
GWCL Exceedances for Third Quarter 2013 Under the August 24, 2012 GWDP
Page 4 of 8
Appendix A
Source Assessment Report for Gross Alpha in MW-32
White Mesa Uranium Mill
Monitoring
Well (Water
Class)
Constituent Exceeding
GWCL
GWCL in
Current
GWDP
January 2011
Monthly
Sample Date
January 2011
Monthly Sample
Result
Q1 2011
Sample
Date
Q1 2011
Result
March 2011
Monthly
Sample Date
March
2011
Monthly
Result
Q2 2011
Sample
Date
Q2 2011
Result
May 2011
Monthly
Sample Date
May 2011
Monthly
Result
June 2011 Monthly
Sample Date
June 2011 Monthly
Result
July 2011
Monthly
Sample Date
July 2011
Monthly
Result
Q3 2011
Sample
Date
Q3 2011
Result
September
2011
Monthly
Sample Date
September
2011 Monthly
Result
Q4 2011
Sample Date
Q4 2011
Result
November
2011 Monthly
Sample Date
November
2011 Monthly
Result
December
2011 Monthly
Sample Date
December
2011
Monthly
Result
Field pH (S.U.)6.78-8.5 NA 6.78 NA 7.03 NA NA NA 6.65 NA 6.88 (7.02)NA NA
Gross Alpha minus Rn
& U (pCi/L)2.36 NA NA NA 0.5 NA NA NA NA NA 0.6 NA NA
Nitrate + Nitrite (as N) 2.83 NA NS NA 2.6 NA NA NA NS NA 4.0 NA NA
Field pH (S.U.)6.5 - 8.5 NA 6.13 NA 7.14 NA NA NA 6.38 NA 6.56 (6.77)NA NA
Manganese (ug/L)550 NA NS NA 32 NA NA NA NS NA 551 NA NA
Cadmium (ug/L)2.5 NA 2.78 NA 2.61 NA NA NA 1.46 NA 1.78 NA NA
Fluoride (Mg/L)0.36 NA NA NA 0.19 NA NA NA NA NA 0.36 NA NA
Thallium (ug/L)1 NA 1.42 NA 1.07 NA NA NA <0.50 NA 0.62 NA NA
Field pH (S.U.)6.5 - 8.5 NA 5.73 NA 6.12 NA NA NA 6.45 NA 6.44 NA NA
Nitrate + Nitrite (as N) 5.6 NA 6 NA 6.4 NA NA NA 6 NA 6.3 NA NA
Chloride (mg/L)38 NA 46 NA 43 NA NA NA 43 NA 44 NA NA
Sulfate (mg/L)462 NA 455 NA 442 NA NA NA 424 NA 456 NA NA
Field pH (S.U.)6.5-8.5 NA 6.71 NA 6.79 NA NA NA 6.39 NA 7.17 (7.24)NA NA
TDS (mg/L)1075 NA 1090 NA 1190 NA NA NA 1090 NA 1110 NA NA
Gross Alpha minus Rn & U (pCi/L)2 NA 0.7 NA 1.1 NA NA NA 0.8 NA 1.5 NA NA
Chloride (mg/L)105 NA 114 NA 109 NA NA NA 105 NA 143 NA NA
Manganese (ug/L)1837 NA NA NA 1690 NA NA NA NA NA 1540 NA NA
Field pH (S.U.)6.1 - 8.5 NA 5.69 NA 6.01 NA NA NA 5.78 NA 6.07(6.11)NA NA
Iron (ug/L)1869 NA NS NA NA 3010 NA NA NA 1080 NA 1220 NA NA
Manganese (ug/L)5624 NA NS NA NA 4900 NA NA NA NA NA 4800 NA NA
TDS (mg/L)4400 NA NS NA NA 4080 NA NA NA NA NA 4280 NA NA
Field pH (S.U.)6.46 - 8.5 NA NS NA NA 6.45 NA NA NA 6.20 NA 6.52 NA NA
Gross Alpha minus Rn & U (pCi/L)3.33 NA 1.5 NA 4.6 NA NA NA 1.9 NA 3.7 NA NA
Field pH (S.U.)6.4 - 8.5 NA 5.99 NA 6.14 NA NA NA 6.10 NA 6.35 NA NA
Notes:
Values in () parentheses are the field pH measurements for the resampled analyses.
! Values was below the GWCL. Field pH was monitored, tracked and reported for the required 8 quarters. The constituent was removed from accelerated reporting pursuant to the DRC latter dated 8/28/12.
MW-19 (Class III)NS
2/9/2011NS
4/5/2011 10/5/2011
NS
MW-27
(Class III)
MW-24
(Class III)
2/9/2011
8/4/2011 10/11/2011
MW-23
(Class III)
NS
MW-29
(Class III)
MW-28
(Class III)
Exceedances are shown in yellow.
NS = Not Required and Not Sampled
NR = Required and Not Reported
NA = Not Applicable
GWCL values are taken from August 24, 2012 version of GWDP.
MW-32
(Class III)2/9/2011NS NS NS NSNSNSNS4/1/2011 8/2/2011
8/30/11 10/3/2011
NS
NS
NS
NSNS
NS
NS
Q2 2011 Results
NS
2/10/2011NS
2/21/2011
NS
NS
NS
NS
NS
NS
NS
2/14/2011NS
Required Semi-Annual Sampling Wells, continued
NS
NS
NS
NS
NS
NS
7/20/3011 10/12/2011
8/4/2011 10/6/2011 NS
NS
NS
NS
NS
NS
NS
NS
NS
NS
NS
NS 4/18/2011 8/9/2011
4/5/2011
4/5/2011
Q1 2011 Results
10/5/2011
4/11/2011 8/8/2011 10/5/2011NS
NS
Q3 2011 Results
4/5/2011
NS NSNS8/8/2011
NS
Q4 2011 Results
NS
NS
NS
NS
APPENDIX A
GWCL Exceedances for Third Quarter 2013 Under the August 24, 2012 GWDP
Page 5 of 8
Appendix A
Source Assessment Report for Gross Alpha in MW-32
White Mesa Uranium Mill
Monitoring Well
(Water Class)
Constituent
Exceeding GWCL
GWCL in
August 24,
2012 GWDP
January 2012
Monthly
Sample Date
January 2012
Monthly
Result
Q1 2012
Sample
Date
Q1 2012
Result
March 2012
Monthly
Sample Date
March 2012
Monthly
Result
April 2012
Monthly
Sample Date
April 2012
Monthly
Result
Q2 2012
Sample
Date
Q2 2012
Result
June 2012 Monthly
Sample
Date
June 2012
Monthly
Result
Q3 2012
Sample
Date
Q3 2012
Result
August
2012
Monthly
Sample Date
August 2012
Monthly
Result
September
2012
Monthly
Sample Date
September 2012
Monthly
Result
October
2012
Monthly
Sample Date
October 2012
Monthly
Result
Q4 2012
Sample
Date
Q4 2012
Result
December
2012
Monthly
Sample Date
December 2012
Monthly
Result
Sample
Frequency
Field pH (S.U.)6.5 - 8.5 7.51 7.59 7.47 7.66 7.49 7.82 7.74 7.43 7.91 7.39 7.47 7.46 Quarterly
Manganese (ug/L)131.29 102 154 121 132 127 122 135 166 130 161 138 137 Quarterly
Manganese (ug/L)2230.30 NA 1790 NA NA 2360 NA 2100 2300 2140 2110 2100 1950 Quarterly
Field pH (S.U.)6.5 - 8.5 6.36 6.57 6.51 6.97 6.73 6.90 6.89 6.58 7.08 6.83 6.52 6.60 Quarterly
Field pH (S.U.)6.5 - 8.5 6.63 6.83 6.55 6.58 6.73 6.99 6.88 6.55 6.54 6.54 6.47 6.62 Quarterly
Cadmium (ug/L)1.5 NA 1.31 NA NA 1.33 NA 1.24 NA NA NA 1.56 NA Quarterly
Chloride (mg/L)35 NA 30 NA NA 30 NA 33 NA NA NA 28.8 NA Quarterly
Fluoride (mg/L)0.42 NA 0.34 NA NA 0.32 NA 0.3 NA NA NA 0.298 NA Quarterly
Uranium 6.5 6.6 6.5 6.93 6.52 5.90 7.6 6.45 6.72 6.01 6.37 6.61 4.83 Quarterly
Nitrate + Nitrite (as
0.62 1.9 2/15/2012 1.2 3 3.4 2.9 2.3 1.9 1.6 1.8 3.5 0.55 1.46 Quarterly
Uranium (ug/L)41.8 64.6 2/21/2012 59.4 31.2 42.2 18.2 66.0 28.4 67.4 64.9 26.9 56.8 51.3 Quarterly
Chloroform (ug/L)70 1900 3300 2900 2900 1700 2400 8/16/2012 970 2200 2300 4720 4020 1250 Quarterly
Chloride (mg/L)58.31 68 40 74 82 74 85 7/11/2012 78 78 67 2.62 52.9 65.9 Quarterly
Field pH (S.U.)6.74 - 8.5 6.59 2/15/2012

6.72 (6.91) 6.39 6.88 7.00 (7.01)7.00 7/11/2012 7.10 6.60 7.40 6.63 6.60 6.78 Quarterly
Dichloromethane
(Methylene Chloride) 5 13 2/15/2012 24 27 20 10 16 8/16/2012 4.9 17 9.8 15.0 34.6 5.5 Quarterly
Nitrate + Nitrite (as
2.5 17 17 18 17 16 15 17 18 16 16.2 18.5 17.2 Quarterly
Chloride (mg/L)128 124 126 128 128 124 131 128 139 130 135 114 122 Quarterly
Uranium (ug/L)8.32 NS NA 7.42 8.38 7.84 6.81 7.8 7.64 8.04 7.67 7.86 7.03 5.80 Quarterly
Selenium (ug/L)34 1/24/2012 33.3 35 39.5 39.1 32.3 37 38.5 38.4 41.9 45.2 36 31.6 Quarterly
Nitrate + Nitrite (as
5 21 21 22 21 20 21.6 21 21 21 18 23.6 22.2 Quarterly
TDS (mg/L)1320 1360 1240 1400 1380 1410 1460 1400 1400 1460 1320 1230 1270 Quarterly
Chloride (mg/L)143 155 150 152 160 151 138 161 175 172 157 189 170 Quarterly
Selenium (ug/L)71 NS 67.8 NS NS 70.2 NA 74 NA NA NA 76.9 NA Quarterly
Field pH (S.U.)6.5 - 8.5 6.78 7.37 7.13 7.14 7.19 7.28 (7.63)7.53 6.96 7.1 7.05 7.04 7.10 Quarterly
Sulfate (mg/L)532 539 538 517 547 532 497 529 571 561 545 557 664 Quarterly
Manganese (ug/L)200 264 253 269 277 258 304 272 273 283 253 241 240 Quarterly
Thallium (ug/l)0.5 < 0.50 0.65 0.71 0.59 0.66 < 0.50 0.57 0.61 0.54 0.517 0.554 0.5 Quarterly
Molybdenum (ug/L)10 <10 <10 NA NA <10 NA <10 NA NA NA 30.4 NA Quarterly
Gross Alpha minus
Rn & U (pCi/L)3.75 6.5 4.1 6.2 4.1 4.5 4.9 3.5 4.2 5.4 4.31 4.23 6.5 Quarterly
Selenium (ug/L)12.5 NA 19.7 NA NA 11.4 7.0 15.9 18.8 8.2 19.0 15.4 12.1 Quarterly
Uranium (ug/L)7.5 16.1 24.7 24.9 22.4 22.2 22.5 24.5 26.2 22.9 22.4 21.8 21 Quarterly
Manganese (ug/L)289 NA NA NA NA 176 NA NA NA NA NA 315 NA Semi-Annually
Tetrahydrofuran (ug/L)11.5 NA NA NA NA 10.3 NA NA NA NA NA 21.8 NA Semi-Annually
Sulfate (mg/L)838 NA NA NA NA 659 NA NA NA NA NA 846 NA Semi-Annually
Selenium (ug/L)37 NA 43.1 NA NA 52.8 NA 51.1 NA NA NA 58.9 NA Semi-Annually
Field pH (S.U.)6.5 - 8.5 NA 6.63 NA NA 6.67 NA 6.99 NA NA NA 6.55 NA Semi-Annually
Fluoride (Mg/L)0.68 NA 0.86 NA NA 1.04 NA 0.96 NA NA NA 1.26 NA Semi-Annually
Field pH (S.U.)6.5 - 8.5 NA 6.46 NA NA 6.68 NA 7.01 NA NA NA 6.35 NA Semi-Annually
Sulfate (mg/L)3640 NA 3020 NA NA 3220 NA 3700 NA NA NA 2780 NA Semi-Annually
Nitrate + Nitrite (as
1.3 NA NA NA NA 1.1 NA NA NA NA NA 1.31 NA Semi-Annually
TDS (mg/L)5805 NA 5690 NA NA 5730 NA 5720 NA NA NA 5610 NA Semi-Annually
Selenium (ug/L)89 NA 65.8 NA NA 85.1 NA 99.3 NA NA NA 111 NA Semi-Annually
MW-05 (Class II)Uranium (ug/L)7.5 NS NA 2/28/2012 18.6 NS NA NS NA 5/9/2012 1.23 NS NA 7/16/2012 0.75 NS NA NS NA NS NA 11/27/2012 0.402 NS NA Semi-Annually
Field pH (S.U.)6.5 - 8.5 NA 6.81 NA NA 6.91 NA 6.98 NA NA NA 6.54 NA Semi-Annually
Selenium (ug/L)25 NA 27.2 NA NA 19.6 NA 20.7 NA NA NA 23 NA Semi-Annually
Selenium (ug/L)128.7 NA NA NA NA 152 NA 120 NA NA NA 117 NA Semi-Annually
Iron (ug/L)81.7 NA < 30 NA NA < 30 NA < 30 NA NA NA <30 NA Semi-Annually
Thallium (ug/l)1.95 NA 3.63 NA NA 3.51 NA 3.73 NA NA NA 3.2 NA Semi-Annually
Sulfate (mg/L)1938.9 NA 1920 NA NA 1790 NA 1900 NA NA NA 1210 NA Semi-Annually
Field pH (S.U.)6.25-8.5 NA 6.6 NA NA 6.59 NA 6.64 NA NA NA 6.51 NA Semi-Annually
TDS (mg/L)3198.77 NA 3230 NA NA 3280 NA 3220 NA NA NA 3160 NA Semi-Annually
12/24/20123/13/2012 4/10/2012 5/8/2012 6/19/2012 7/11/2012 8/7/2012 9/19/2012 10/23/2012 11/12/2012MW-11 (Class II)1/26/2012 2/13/2012
NS
NS 7/18/2012
Q1 2012 Results Q2 2012 Results Q3 2012 Results
7/11/2012
7/10/2012
7/11/2012
6/19/2012
6/18/2012
6/19/2012 8/8/2012
3/14/20121/25/2012 2/14/2012
3/14/2012MW-14 (Class III)
4/9/2012
7/10/2012 8/8/2012 9/19/2012
7/18/2012
6/19/2012
NS NS
NS
4/10/2012
5/14/2012
5/2/2012
5/1/2012 NS
NS
NS
NS
5/2/2012 6/18/2012 6/29/2012 7/9/2012 8/6/2012
MW-12 (Class III)2/29/2012
MW-03A (Class
III)
NS
NS
5/2/2012
5/7/2012
6/26/2012
4/12/2012
MW-03 (Class III)2/29/2012
MW-31 (Class III) 1/24/2012 2/13/2012
1/24/2012 2/21/2012
MW-25 (Class III)
NS
NS
NS
Q4 2012 Results
Required Quarterly Sampling Wells
Required Semi-Annual Sampling Wells
NS
NS
NS
NS2/22/2012
MW-18 (Class III)2/27/2012 NS
NS
3/1/2012
5/9/2012
5/15/2012
5/10/2012
4/30/2012
NS
NS
MW-15 (Class III)
7/19/2012
7/17/2012
NS 7/17/2012
NS
NS
NS
NS
NS
NS
NS
NS
NS
NS
NS
NS
11/27/2012
11/28/2012
11/29/2012
11/27/2012
11/26/2012
11/14/2012
NS
NS
NS
NS
NS
NS
MW-01 (Class II)NS NS
1/25/2012
NS
3/13/2012 4/9/2012
2/14/2012MW-35 (Class II)3/13/20121/24/2012
3/14/2012 4/11/20122/15/2012
11/27/2012
11/12/2012
9/19/2012
11/13/2012
5/9/2012
6/18/2012 7/10/2012 8/7/2012
8/7/2012
8/6/2012
5/2/2012MW-30 (Class II)
1/24/2012
2/14/2012 3/14/2012 4/10/2012
MW-26 (Class III)
11/6/2012
11/13/2012
12/18/2012
12/24/2012
12/26/2012
12/18/2012
12/18/2012
9/18/2012
9/18/2012
9/18/2012
10/23/2012
10/22/2012
9/19/2012
10/24/2012 11/15/2012 12/24/2012
10/23/2012
10/22/2012
10/23/2012
NS
NS
NS
NS
NS
NS
APPENDIX A
GWCL Exceedances for Third Quarter 2013 Under the August 24, 2012 GWDP
Page 6 of 8
Appendix A
Source Assessment Report for Gross Alpha in MW-32
White Mesa Uranium Mill
Monitoring Well
(Water Class)
Constituent
Exceeding GWCL
GWCL in
Current
GWDP
January 2012
Monthly
Sample Date
January 2012
Monthly
Result
Q1 2012
Sample
Date
Q1 2012
Result
March 2012
Monthly
Sample Date
March
2012
Monthly
Result
April 2012 Monthly
Sample Date
April 2012
Monthly
Result
Q2 2012
Sample
Date
Q2 2012
Result
June 2012
Monthly
Sample
Date
June
2012
Monthly
Result
Q3 2012
Sample
Date
Q3 2012
Result
August
2012 Monthly
Sample
Date
August
2012
Monthly
Result
September
2012
Monthly
Sample
Date
September
2012
Monthly
Result
October
2012
Monthly
Sample
Date
October
2012
Monthly
Result
Q4 2012 Sample
Date
Q4 2012
Result
December
2012
Monthly
Sample
Date
December
2012
Monthly
Result
Sample
Frequency
Field pH (S.U.)6.78-8.5 NA 6.83 NA NA 6.86 NA 7.21 NA NA NA 6.71 NA Semi-Annually
Gross Alpha minus
Rn & U (pCi/L)2.36 NA NA NA NA 0.9 NA NA NA NA NA 4.86 NA Semi-Annually
Nitrate + Nitrite (as
2.83 NA 3.9 NA NA 3.7 NA 4 NA NA NA 3.96 NA Semi-Annually
Field pH (S.U.)6.5 - 8.5 NA 6.61 NA NA 6.74 NA 7.10 NA NA NA 6.61 NA Semi-Annually
Manganese (ug/L)550 NA 51 NA NA 49 NA 117 NA NA NA 54.3 NA Semi-Annually
Cadmium (ug/L)2.5 NA 2.25 NA NA 2.01 NA 4.7 NA NA NA 1.35 NA Semi-Annually
Fluoride (Mg/L)0.36 NA NA NA NA 0.14 NA NA NA NA NA 0.558 NA Semi-Annually
Thallium (ug/L)1 NA 0.96 NA NA 0.74 NA 1.36 NA NA NA 0.666 NA Semi-Annually
Field pH (S.U.)6.5 - 8.5 NA 6.03 NA NA 6.21 NA 6.45 NA NA NA 6.01 NA Semi-Annually
Nitrate + Nitrite (as
5.6 NA 6.4 NA NA 6.2 NA 6.7 NA NA NA 6.9 NA Semi-Annually
Chloride (mg/L)38 NA 45 NA NA 46 NA 47 NA NA NA 44.2 NA Semi-Annually
Sulfate (mg/L)462 NA 451 NA NA 446 NA 453 NA NA NA 451 NA Semi-Annually
Field pH (S.U.)6.5-8.5 NA 7.24 NA NA 7.03 NA 7.40 NA NA NA 6.69 NA Semi-Annually
TDS (mg/L)1075 NA 1140 NA NA 1170 NA 1150 NA NA NA 1070 NA Semi-Annually
Gross Alpha minus Rn & U (pCi/L)2 NA 2.3 NA NA 0.8 NA 1.2 NA NA NA 1.33 NA Semi-Annually
Chloride (mg/L)105 NA 109 NA NA 114 NA 7/16/2012 105 NA NA NA 115 NA Semi-Annually
Manganese (ug/L)1837 NA NA NA NA 1850 NA 8/1/2012 1660 NA NA NA 1680 NA Semi-Annually
Field pH (S.U.)6.1 - 8.5 NA 6.22 NA NA 6.15 NA 7/16/2012
//
6.38
( 81)
NA NA NA 5.98 NA Semi-Annually
Iron (ug/L)1869 NA 1310 NA NA 1400 NA 7/16/2012 1270 NA NA NA 1350 NA Semi-Annually
Manganese (ug/L)5624 NA NA NA NA 6140 NA 8/1/2012 5190 NA NA NA 5040 NA Semi-Annually
TDS (mg/L)4400 NA NA NA NA 4600 NA 8/1/2012 4420 NA NA NA 4430 NA Semi-Annually
Field pH (S.U.)6.46 - 8.5 NA 7.12 NA NA 6.47 NA 7/16/2012 6.68 NA NA NA 6.48 NA Semi-Annually
Gross Alpha minus Rn & U (pCi/L)3.33 NA 1.8 NA NA 2.4 NA 1.4 NA NA NA 2.97 NA Semi-Annually
Field pH (S.U.)6.4 - 8.5 NA 6.57 NA NA 6.40 NA 6.72 NA NA NA 6.23 NA Semi-Annually
Notes:
Values in () parentheses are the field pH measurements for the resampled analyses.
4/30/2012
NS
NS
NS
NS
NS
NS
NS
Q2 2012 Results
7/19/2012
7/17/2012
7/18/20125/10/2012
5/1/2012
5/8/2012
5/8/2012 NS
7/16/2012
Exceedances are shown in yellow.
NS = Not Required and Not Sampled
NR = Required and Not Reported
NA = Not Applicable
GWCL values are taken from August 24, 2012 version of GWDP.
MW-32 (Class III)2/21/2012
Required Semi-Annual Sampling Wells, continued
MW-19 (Class III)2/28/2012
Q1 2012 Results
NS
NS2/20/2012
MW-24 (Class III)2/23/2012
NS
5/16/2012
5/16/2012
NS
NS
NS
NS
NS
MW-29 (Class III)
NS
NSMW-23 (Class III)
7/9/2012
2/22/2012
MW-28 (Class III)2/28/2012
MW-27 (Class III)2/28/2012
NS
NS
NS
NS
NS
NS
NS
NS
NS
NS
NS
NS
NS
NS
NS
NS
NS
NS
NS
NS
NS
NS
NS
NS
NS
NS
NS
NS
NS
12/13/2012
12/5/2012
11/29/2012
11/13/2012
11/14/2012
11/14/2012
11/6/2012
NS
NS
NS
NS
Q4 2012 Results
NS
NS
NS
NS
NS
Q3 2012 Results
APPENDIX A
GWCL Exceedances for Third Quarter 2013 Under the August 24, 2012 GWDP
Page 7 of 8
Appendix A
Source Assessment Report for Gross Alpha in MW-32
White Mesa Uranium Mill
Monitoring Well
(Water Class)
Constituent Exceeding
GWCL
GWCL in August
24, 2012 GWDP
January 2013
Monthly
Sample Date
January 2013
Monthly
Result
Q1 2013
Sample Date
Q1 2013
Result
March 2013
Monthly
Sample Date
March 2013
Monthly
Result
April 2013
Monthly
Sample Date
April 2013
Monthly
Result
Q2 2013
Sample Date
Q2 2013
Result
June 2013 Monthly
Sample
Date
June 2013
Monthly
Result
Q3 2013
Sample
Date
Q3 2013
Result
August
2013
Monthly
Sample Date
August 2013
Monthly
Result
September 2013
Monthly
Sample Date
September 2013
Monthly
Result
Sample Frequency
Field pH (S.U.)6.5 - 8.5 7.45 7.46 7.33 6.17 7.88 7.47 7.40 7.7 7.39 Quarterly
Manganese (ug/L)131.29 115 139 164 181 144 135 138 158 134 Quarterly
Manganese (ug/L)2230.30 1930 2250 2110 2060 2200 1990 2100 2100 2190 Quarterly
Field pH (S.U.)6.5 - 8.5 6.48 6.52 6.48 7.58 7.39 6.54 6.47 6.86 6.48 Quarterly
Field pH (S.U.)6.5 - 8.5 6.65 6.62 6.41 7.00 7.19 6.61 6.32 6.74 6.54 Quarterly
Cadmium (ug/L)1.5 NA 1.35 1.40 1.36 1.52 1.31 1.41 1.57 1.31 Quarterly
Chloride (mg/L)35 NA 36.1 NA NA 28.1 30.4 28.0 31.1 29.6 Quarterly
Fluoride (mg/L)0.42 NA 0.32 NA NA 0.392 NA 0.534 NA NA Quarterly
Uranium 6.5 5.97 5.39 5.68 5.56 5.88 5.35 6.22 6.42 5.99 Quarterly
Nitrate + Nitrite (as N) 0.62 1.66 1.38 1.61 1.73 2.01 3.04 2.11*1.98 1.77 3.60 Quarterly
Uranium (ug/L)41.8 65.7 57.8 69 58.8 64.3 71.3 70 72.3 19.9 Quarterly
Chloroform (ug/L)70 1270 1500 1340 1680 1210 4030*2410 2110 4170 Quarterly
Chloride (mg/L)58.31 63.5 77 73.6 70.4 63.1 87.8 77.9*72.1 70.8 77.3 Quarterly
Field pH (S.U.)6.74 - 8.5 6.51 6.71 6.70 6.96 7.31 6.85 6.43 7.41 6.71 Quarterly
Dichloromethane
(Methylene Chloride) 5 6.49 5.53 8.31 10.2 4.07 52.4* [12.1]14.2 14.6 42.4 Quarterly
Nitrate + Nitrite (as N) 2.5 19.2 21.4 14.3 16.8 18.8 16.1 17.6 16.4 16.9 Quarterly
Chloride (mg/L)128 128 129 126 117 119 127 130 126 131 Quarterly
Uranium (ug/L)8.32 8.36 7.4 6.85 7.08 6.31 8.22 7.48 7.07 7.00 Quarterly
Selenium (ug/L)34 37.2 42.3 39 37.3 39.4 32.1 36.5 36.3 35.2 Quarterly
Nitrate + Nitrite (as N) 5 22.8 19.3 19.1 18.8 23.8 20.0 21.7 16.0 21.2 Quarterly
TDS (mg/L)1320 1270 1390 1420 1260 1540 1380 1510 1440 1500 Quarterly
Chloride (mg/L)143 176 174 168 171 169 179 182 183 193 Quarterly
Selenium (ug/L)71 NS 74.1 81.8 72.9 75.9 73.7 75.7 73.2 72.6 Quarterly
Field pH (S.U.)6.5 - 8.5 6.94 7.32 7.28 6.37 7.92 7.10 6.98 7.36 7.06 Quarterly
Sulfate (mg/L)532 611 644 611 668 630 659 659 656 666 Quarterly
Manganese (ug/L)200 247 272 246 243 252 243 250 262 257 Quarterly
Thallium (ug/l)0.5 <0.5 <0.5 0.505 <0.5 0.715 0.946 <0.5 <0.5 <0.5 Quarterly
Molybdenum (ug/L)10 NS <10 <10 <10 <10 <10 <10 <10 <10 Quarterly
Gross Alpha minus Rn &
U (pCi/L)3.75 6.62 5.09 9.51 4.75 4.92 3.24 5.70 3.92 5.10 Quarterly
Selenium (ug/L)12.5 11.0 10.8 22.6 11.8 16.1 13.6 8.01 <5 <5 Quarterly
Uranium (ug/L)7.5 23.6 21.3 22.1 20.0 22.0 19.3 23.0 21.4 20.2 Quarterly
Manganese (ug/L)289 NA 173 NA NA 127 NA 83.9 NA NA Semi-Annually
Tetrahydrofuran (ug/L)11.5 NA 12.6 NA NA 3.26 NA 1.86 NA NA Semi-Annually
Sulfate (mg/L)838 NA 761 NA NA 839 NA 911 NA NA Semi-Annually
Selenium (ug/L)37 NA 51.8 NA NA 46.3 NA 52.0 NA NA Semi-Annually
Field pH (S.U.)6.5 - 8.5 NA 6.20 NA NA 7.14 NA 6.46 NA NA Semi-Annually
Fluoride (Mg/L)0.68 NA 0.902 NA NA 0.994 NA 1.18 NA NA Semi-Annually
Field pH (S.U.)6.5 - 8.5 NA 6.84 NA NA 7.10 NA 6.50 NA NA Semi-Annually
Sulfate (mg/L)3640 NA 3480 NA NA 3120 NA 3670 NA NA Semi-Annually
Nitrate + Nitrite (as N) 1.3 NA 1.22 NA NA 1.11 NA 1.09 NA NA Semi-Annually
TDS (mg/L)5805 NA 5750 NA NA 6020 NA 5860 NA NA Semi-Annually
Selenium (ug/L)89 NA 88.7 NA NA 75.6 NA 79.7 NA NA Semi-Annually
MW-05 (Class II)Uranium (ug/L)7.5 NS NA 3/11/2013 36 NS NA NS NA 5/14/2013 1.33 NS NA 7/18/2013 0.574 NS NA NS NA Semi-Annually
Field pH (S.U.)6.5 - 8.5 NA 6.56 NA NA 7.19 NA 6.60 NA NA Semi-Annually
Selenium (ug/L)25 NA 19.6 NA NA 19.0 NA 20.5 NA NA Semi-Annually
Selenium (ug/L)128.7 NA 137 NA NA 120 NA 100 NA NA Semi-Annually
Iron (ug/L)81.7 NA <30 NA NA <30 NA <30 NA NA Semi-Annually
Thallium (ug/l)1.95 NA 3.26 NA NA 2.81 NA 3.32 NA NA Semi-Annually
Sulfate (mg/L)1938.9 NA 1270 NA NA 1860 NA 1860 NA NA Semi-Annually
Field pH (S.U.)6.25-8.5 NA 6.35 NA NA 6.97 NA 6.45 NA NA Semi-Annually
TDS (mg/L)3198.77 NA 3350 NA NA 3160 NA 3170 NA NA Semi-Annually
7/10/2013 8/19/2013 9/17/2013
6/5/2013
6/25/2013
4/17/2013 5/15/2013 6/25/2013
4/16/2013 5/13/2013 6/24/2013
7/11/2013 8/20/2013 9/18/2013
7/10/2013 8/20/2013 9/18/2013
7/9/2013 8/19/2013 9/17/2013
MW-11 (Class II)1/23/2013 2/20/2013 3/20/2013 4/16/2013 5/14/2013 6/25/2013
MW-26 (Class III)1/24/2013 3/20/20132/20/2013
MW-25 (Class III) 1/22/2013 2/20/2013 3/19/2013 4/17/2013 5/14/2013 6/24/2013
4/17/2013 5/23/2013
MW-18 (Class III)NS 2/25/2013 NS 7/15/2013 NS NS
MW-12 (Class III)NS 3/6/2013 NS
MW-15 (Class III)NS 3/5/2013 NS
MW-03A (Class III)NS 3/13/2013 NS
MW-03 (Class III)NS 3/12/2013 NS
MW-01 (Class II)NS 3/12/2013 NS
Required Semi-Annual Sampling Wells
NS
7/18/2013 NS NS
MW-35 (Class II)1/23/2013 2/26/2013 3/19/13
MW-31 (Class III) 1/22/2013 2/19/2013 3/19/2013
1/23/2013MW-30 (Class II)2/26/2013 3/20/2013
Q1 2013 Results
MW-14 (Class III)1/23/2013 2/26/2013 3/20/2013
Required Quarterly Sampling Wells
Q2 2013 Results
4/16/2013 5/14/2013 6/25/2013
7/10/2013 8/20/2013 9/18/2013
7/11/2013 8/20/2013 9/19/2013
4/17/2013 5/13/2013 6/24/2013
NS
NS
NS
NS
NS
NS
5/21/2013
5/22/2013
5/23/2013
5/15/2013
5/15/2013
5/20/2013
NS
NS
NS
NS
NS
NS
Q3 2013 Results
7/19/2013 NS NS
7/17/2013 NS NS
7/18/2013 NS NS
7/9/2013 8/19/2013 9/17/2013
7/23/2013 NS
APPENDIX A
GWCL Exceedances for Third Quarter 2013 Under the August 24, 2012 GWDP
Page 8 of 8
Appendix A
Source Assessment Report for Gross Alpha in MW-32
White Mesa Uranium Mill
Monitoring Well
(Water Class)
Constituent Exceeding
GWCL
GWCL in Current
GWDP
January 2013
Monthly
Sample Date
January 2013
Monthly
Result
Q1 2013
Sample Date
Q1 2013
Result
March 2013
Monthly
Sample Date
March 2013
Monthly
Result
April 2013 Monthly
Sample Date
April 2013 Monthly
Result
Q2 2013
Sample Date
Q2 2013
Result
June 2013
Monthly
Sample
Date
June 2013
Monthly
Result
Q3 2013
Sample
Date
Q3 2013
Result
August
2013 Monthly
Sample
Date
August
2013
Monthly
Result
September
2013
Monthly
Sample Date
September
2013
Monthly
Result
Sample Frequency
Field pH (S.U.)6.78-8.5 NA 6.50 NA NA 7.16 NA 6.91 NA NA Semi-Annually
Gross Alpha minus Rn &
U (pCi/L)2.36 NA 1.11 NA NA 1.19 NA <1.00 NA NA Semi-Annually
Nitrate + Nitrite (as N) 2.83 NA 3.61 NA NA 4.21 NA 3.66 NA NA Semi-Annually
Field pH (S.U.)6.5 - 8.5 NA 6.37 NA NA 7.23 NA 6.61 NA NA Semi-Annually
Manganese (ug/L)550 NA 137 NA NA 24.3 NA 129 NA NA Semi-Annually
Cadmium (ug/L)2.5 NA 2.0 NA NA 1.32 NA 6.72 NA NA Semi-Annually
Fluoride (Mg/L)0.36 NA 0.355 NA NA 0.211 NA 0.288 NA NA
Thallium (ug/L)1 NA 0.88 NA NA 0.618 NA 1.64 NA NA Semi-Annually
Field pH (S.U.)6.5 - 8.5 NA 6.29 NA NA 6.77 NA 5.80 NA NA Semi-Annually
Nitrate + Nitrite (as N) 5.6 NA 7.94 NA NA 7.09 NA 6.97 NA NA Semi-Annually
Chloride (mg/L)38 NA 50.3 NA NA 44.3 NA 44.2 NA NA Semi-Annually
Sulfate (mg/L)462 NA 431 NA NA 497 NA NA NA NA Semi-Annually
Field pH (S.U.)6.5-8.5 NA 7.03 NA NA 7.58 NA 7.00 NA NA Semi-Annually
TDS (mg/L)1075 NA 1140 NA NA 1110 NA 1110 NA NA Semi-Annually
Gross Alpha minus Rn & U (pCi/L)2 NA <1.0 NA NA 1.57 NA <1.00 NA NA Semi-Annually
Chloride (mg/L)105 NA 110 NA NA 102 NA 107 NA NA Semi-Annually
Manganese (ug/L)1837 NA 1680 NA NA 1730 NA 1650 NA NA Semi-Annually
Field pH (S.U.)6.1 - 8.5 NA 6.00 NA NA 6.63 NA 5.97 NA NA Semi-Annually
Iron (ug/L)1869 NA 1350 NA NA 1250 NA 1400 NA NA Semi-Annually
Manganese (ug/L)5624 NA 5340 NA NA 5140 NA 5140 NA NA Semi-Annually
TDS (mg/L)4400 NA 4500 NA NA 4340 NA 4270 NA NA Semi-Annually
Field pH (S.U.)6.46 - 8.5 NA 6.36 NA NA 6.88 NA 6.37 NA NA Semi-Annually
Gross Alpha minus Rn & U (pCi/L)3.33 NA 5.02 NA NA 3.72 NA 6.46 NA NA Semi-Annually
Field pH (S.U.)6.4 - 8.5 NA 6.52 NA NA 7.10 NA 6.39 NA NA Semi-Annually
Notes:
Values in () parentheses are the field pH measurements for the resampled analyses.
* Data are reported from the 6/5/13 chlorofrm program sample.
MW-32 (Class III)NS 2/19/2013 NS
MW-29 (Class III)NS 3/6/2013 NS
MW-28 (Class III)NS 3/5/2013 NS
MW-27 (Class III)NS 2/25/2013 NS
MW-24 (Class III)NS 3/13/2013 NS
MW-23 (Class III)NS 3/11/2013 NS
MW-19 (Class III)NS 3/13/2013 NS
Required Semi-Annual Sampling Wells, continued
Q2 2013 Results
NS 7/15/2013 NS NS
Q1 2013 Results
GWCL values are taken from August 24, 2012 version of GWDP.
NS = Not Required and Not Sampled
NR = Required and Not Reported
NA = Not Applicable
Exceedances are shown in yellow.
NS
NS
NS
NS
NS
NS
NS
NS
5/20/2013
5/23/2013
5/22/2013
5/21/2013
5/15/2013
5/23/2013
5/13/2013
NS
NS
NS
NS
NS 7/17/2013 NS NS
7/9/2013 NS NS
7/18/2013 NS NS
7/19/2013 NS NS
7/17/2013 NS NS
Q3 2013 Results
7/17/2013 NS NS

APPENDIX B
Geochemical Analysis for Gross Alpha in MW-32
Page 1 of 1
Appendix B-1
Source Assessment Report for Gross Alpha in MW-32
White Mesa Uranium Mill
Appendix B-1: Summary of Geochemical Analysis for Gross Alpha in MW-32
W p
MW-32
Gross alpha
minus Rn and U 42 0 3.36 1.83 0.99 0.90 Yes
Mann-
Kendall
Trend
Analysisc
r2 p S p
0.0387 0.2121 129.0000 0.0826 No No 9.20
Mean + 2σ
Fractional
Approach
GWCL
BKG Rpt
Proposed
GWCL
Current
GWCL
Flowsheet
GWCL
Flowsheet
GWCL
Rationale
7 7.5 3.33 3.33 7.0098 Mean + 2σ
Notes:σ = sigma N = number of valid data points
%ND = percent of non-detected values p = probability
µg/L = micrograms per liter W = Shapiro Wilk test value
mg/L = milligrams per liter
r2 = The measure of how well the trendline fits the data where r2=1 represents a perfect fit.
Distribution = Distribution as determined by the Shapiro-Wilk distribution test
Mean = The arithmatic mean as determined for normally or log-normally distributed constituents
Standard Deviation = The standard deviation as determined for normally or log-normally distributed constituents
Highest Historical Value = The highest observed value
Well Constituent N
% Non-
Detected
Values Mean
Shapiro-Wilk Test for
Normality Normally or
Lognormally
Distributed?
Least Squares
Regression Trend
Analysis Significant
Trend
Previously
Identified
Increasing
Trend?
Highest
Historical
Value (HHV)
Standard
Deviation
Page 1 of 1
Appendix B-2
Source Assessment Report for Gross Alpha in MW-32
White Mesa Uranium Mill
Appendix B-2: Comparison of Calculated and Measured TDS in MW-32
Date Sampled
Alkalinity
(mg/L)
Calcium
(mg/L)
Chloride
(mg/L)
Potassium
(mg/L)
Magnesium
(mg/L)
Sodium
(mg/L)
Sulfate
(mg/L)
Measured
TDS (mg/L)
Calculated
TDS (mg/L)Ratio
3/12/2008 435 526 31 14.9 234 233 2420 3800 3894 102.47%
6/5/2008 407 529 29 14.6 234 232 2430 3550 3876 109.17%
8/5/2008 420 550 30 14.9 249 237 2470 3850 3971 103.14%
11/5/2008 412 531 29 14.5 223 228 2450 3820 3888 101.77%
2/2/2009 413 527 30 14.3 240 231 2340 3510 3795 108.13%
5/13/2009 420 447 31 12.5 206 215 2440 3840 3772 98.22%
8/19/2009 420 492 33 12.2 173 218 1950 3680 3298 89.63%
4/20/2010 486 514 32 14.4 217 235 2390 3750 3888 103.69%
11/10/2010 480 498 40 14.4 211 218 2330 3690 3791 102.75%
4/1/2011 473 529 31 14.6 225 246 2180 3760 3699 98.37%
10/3/2011 447 513 32 14 220 210 2370 3660 3806 103.99%
4/30/2012 484 480 32 15.6 202 208 2130 3850 3552 92.25%
Page 1 of 1
Appendix B-3
Source Assessment Report for Gross Alpha in MW-32
White Mesa Uranium Mill
B-3: Charge Balance Calcultions for Major Cations and Anions in MW-32
Well Date
Calcium
(meq/L)
Sodium
(meq/L)
Magnesium
(meq/L)
Potassium
(meq/L)
Total
Cation
Charge
(meq/L)
HCO3
(meq/L)
Chloride
(meq/L)
SO4
(meq/L)
Total Anion
Charge
(meq/L)
Percent
Difference
MW-32 3/12/2008 26.25 10.13 19.25 0.38 56.01 -7.13 -0.87 -50.39 -58.39 -4.24%
MW-32 6/5/2008 26.40 10.09 19.25 0.37 56.11 -6.67 -0.82 -50.59 -58.08 -3.51%
MW-32 8/5/2008 27.45 10.31 20.49 0.38 58.62 -6.88 -0.85 -51.43 -59.16 -0.91%
MW-32 11/5/2008 26.50 9.92 18.35 0.37 55.13 -6.75 -0.82 -51.01 -58.58 -6.25%
MW-32 2/2/2009 26.30 10.05 19.74 0.37 56.46 -6.77 -0.85 -48.72 -56.33 0.22%
MW-32 5/13/2009 22.31 9.35 16.95 0.32 48.92 -6.88 -0.87 -50.80 -58.56 -19.69%
MW-32 8/19/2009 24.55 9.48 14.23 0.31 48.58 -6.88 -0.93 -40.60 -48.41 0.34%
MW-32 4/20/2010 25.65 10.22 17.85 0.37 54.09 -7.96 -0.90 -49.76 -58.63 -8.39%
MW-32 11/10/2010 24.85 9.48 17.36 0.37 52.06 -7.87 -1.13 -48.51 -57.51 -10.46%
MW-32 4/1/2011 26.40 10.70 18.51 0.37 55.98 -7.75 -0.87 -45.39 -54.01 3.51%
MW-32 10/3/2011 25.60 9.13 18.10 0.36 53.19 -7.33 -0.90 -49.34 -57.57 -8.24%
MW-32 4/30/2012 23.95 9.05 16.62 0.40 50.02 -7.93 -0.90 -44.35 -53.18 -6.33%
Notes:
meq/L= milliequivalent per liter
HCO3 = Bicarbonate
SO4 = Sulfate
Page 1 of 1
Appendix B-4
Source Assessment Report for Gross Alpha in MW-32
White Mesa Uranium Mill
Appendix B-4: Descriptive Statistics for Gross Alpha in MW-32
Mean N Minimum Maximum Std.Dev.Range
Geometric
Mean Skewness Kurtosis Q25 Median Q75
3.359 42 1.000 9.200 1.8254 8.200 2.960 1.51721 2.725370 1.900 2.935 4.000
Page 1 of 1
Appendix B-5
Source Assessment Report for Gross Alpha in MW-32
White Mesa Uranium Mill
Appendix B-5: MW-32 Gross Alpha Data Used in Statistical Analysis
Date Sampled Gross Alpha minus Rn and U Units Lab Qualifier
3/30/2005 2.4 pCi/L
9/22/2005 3.1 pCi/L
12/14/2005 1 pCi/L
3/22/2006 2.5 pCi/L
6/21/2006 2 pCi/L
9/13/2006 1.4 pCi/L
10/25/2006 1.9 pCi/L
6/21/2007 1.7 pCi/L
10/24/2007 3 pCi/L
1/29/2008 5.3 pCi/L
2/20/2008 9.2 pCi/L
3/12/2008 2.8 pCi/L
4/29/2008 3.4 pCi/L
5/14/2008 4 pCi/L
6/5/2008 3.5 pCi/L
7/9/2008 3.5 pCi/L
8/5/2008 2.6 pCi/L
9/8/2008 2.9 pCi/L
10/13/2008 1.8 pCi/L
11/5/2008 3.7 pCi/L
12/9/2008 5.8 pCi/L
2/2/2009 5.5 pCi/L
5/13/2009 1.6 pCi/L
8/19/2009 2.6 pCi/L
10/14/2009 4 pCi/L
11/18/2009 1.6 pCi/L
12/1/2009 2.7 pCi/L
1/12/2010 3.9 pCi/L
4/20/2010 4.5 pCi/L
9/13/2010 2.9 pCi/L
11/10/2010 8.8 pCi/L
2/9/2011 1.5 pCi/L
4/1/2011 4.6 pCi/L
8/30/2011 1.9 pCi/L
10/3/2011 3.7 pCi/L
2/21/2012 1.8 pCi/L
4/30/2012 2.4 pCi/L
7/9/2012 1.4 pCi/L
11/6/2012 2.97 pCi/L
2/19/2013 5.02 pCi/L
5/13/2013 3.72 pCi/L
7/9/2013 6.46 pCi/L
Notes:
pCi/L = pico Curies per liter
Rn = radon
U = Uranium
Page 1 of 1
Appendix B-6
Source Assessment Report for Gross Alpha in MW-32
White Mesa Uranium Mill
Appendix B-6: MW-32 Gross Alpha Data Omitted from Statistical Analysis
Date
Sampled Gross Alpha*
Report
Units
Lab
Qualifier
Lab
Detection
Limit Reason
8/21/2007 7.5 pCi/L U 7.5 Insensitive Detection Limit
3/16/2007 16.8 pCi/L Extreme outlier, decimal error likely
Notes:
* Gross alpha minus radon and uranium
pCi/L = picoCuries per liter
U = Not detected
Page 1 of 1
Appendix B-7
Source Assessment Report for Gross Alpha in MW-32
White Mesa Uranium Mill
Appendix B-7: Box Plot
Box Plot for Gross Alpha minus Rn and U in MW-32
0
2
4
6
8
10
12
14
16
18
Gr
o
s
s

A
l
p
h
a

(
p
C
i
/
L
)
Median = 2.985
25%-75% = (1.95, 4.25)
1%-99% = (1, 16.8)
Outliers
Extremes
Page 1 of 1
Appendix B-8
Source Assessment Report for Gross Alpha in MW-32
White Mesa Uranium Mill
Appendix B-8: Histogram
Histogram for Gross Alpha minus Rn and U in MW-32
SW-W = 0.9867, p = 0.9001
-0.1 0.0 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 1.0 1.1
Log Result
0
1
2
3
4
5
6
7
8
9
10
No

o
f

o
b
s
Page 1 of 1
Appendix B-9
Source Assessment Report for Gross Alpha in MW-32
White Mesa Uranium Mill
Appendix B-9: Linear Regression
Linear Regression for Gross Alpha minus Rn and U in MW-32
r = 0.1966, p = 0.2121; r2 = 0.0387
1/14/2004 5/28/2005 10/10/2006 2/22/2008 7/6/2009 11/18/2010 4/1/2012 8/14/2013 12/27/2014
Date Sampled
0
1
2
3
4
5
6
7
8
9
10
Gr
o
s
s

A
l
p
h
a

(
p
C
i
/
L
)

APPENDIX C
Geochemical Analysis for Indicator Parameters in MW-32
Page 1 of 1
Appendix C-1
Source Assessment Report for Gross Alpha in MW-32
White Mesa Uranium Mill
Appendix C-1: Summary of Geochemical Analysis for Indicator Parameters in MW-32
Mann-Kendall
Trend
Analysisc
W p r2 p S p
Chloride (mg/L)55 0 0.9120 0.0007 No 132 1.65 No
Fluoride (mg/L)26 0 3.36 1.83 0.9275 0.0677 Yes 0.0022 0.8189 42.00 0.18 No
Sulfate (mg/L)26 0 0.8094 0.0003 No 1 0.5 Yes
Uranium (µg/L)27 0 0.7887 0.0001 No -106.00 0.01 Decreasing No
Notes:
%ND = percent of non-detected values N = number of valid data points
µg/L = micrograms per liter p = probability
mg/L = milligrams per liter W = Shapiro Wilk test value
r2 = The measure of how well the trendline fits the data where r2=1 represents a perfect fit.
Distribution = Distribution as determined by the Shapiro-Wilk distribution test
Mean = The arithmatic mean as determined for normally or log-normally distributed constituents
Standard Deviation = The standard deviation as determined for normally or log-normally distributed constituents
Normally or
Lognormally
distributed?
Least Squares
Regression Trend
Analysis
Significant
Trend
Previously
Identified
Increasing
Trend?Constituent N
% Non-
Detected
Values Mean
Standard
Deviation
Shapiro-Wilk Test for
Normality
Page 1 of 1
Appendix C-2
Source Assessment Report for Gross Alpha in MW-32
White Mesa Uranium Mill
Appendix C-2: Descriptive Statistics for Indicator Parameters in MW-32
Parameter Mean N Minimum Maximum Std.Dev.Range
Geometric
Mean Skewness Kurtosis Q25 Median Q75
Chloride (mg/L)31.904 55 25.000 38.000 2.2472 13.000 31.823 -0.68459 1.956357 31.000 32.000 33.000
Fluoride (mg/L)0.199 26 0.130 0.300 0.0316 0.170 0.197 0.88878 3.769956 0.180 0.200 0.210
Sulfate (mg/L)2336.154 26 1950.000 2470.000 127.5642 520.000 2332.597 -1.63468 2.533400 2300.000 2380.000 2420.000
Uranium (µg/L)2.423 27 0.580 4.230 0.6881 3.650 2.307 0.27702 2.769845 2.080 2.420 2.660
Notes:
µg/L = micrograms per liter
mg/L = milligrams per liter
Page 1 of 4
Appendix C-3
Source Assessment Report for Gross Alpha in MW-32
White Mesa Uranium Mill
Appendix C-3: MW-32 Indicator Parameter Data Used in Statistical Analysis
Date Sampled Parameter Results Units Lab Qualifier
9/13/2002 Chloride 34.1 mg/L
3/30/2005 Chloride 34 mg/L
6/23/2005 Chloride 32 mg/L
9/22/2005 Chloride 33 mg/L
12/7/2005 Chloride 33 mg/L
12/14/2005 Chloride 33 mg/L
3/9/2006 Chloride 32 mg/L
3/22/2006 Chloride 32 mg/L
6/21/2006 Chloride 30 mg/L
7/20/2006 Chloride 32 mg/L
9/13/2006 Chloride 32 mg/L
10/25/2006 Chloride 31 mg/L
11/8/2006 Chloride 31 mg/L
2/28/2007 Chloride 32 mg/L
3/16/2007 Chloride 34 mg/L
6/21/2007 Chloride 34 mg/L
6/27/2007 Chloride 32 mg/L
8/15/2007 Chloride 31 mg/L
8/21/2007 Chloride 31 mg/L
10/10/2007 Chloride 32 mg/L
10/24/2007 Chloride 33 mg/L
3/12/2008 Chloride 30 mg/L
3/26/2008 Chloride 31 mg/L
6/5/2008 Chloride 32 mg/L
6/25/2008 Chloride 29 mg/L
8/5/2008 Chloride 27 mg/L
9/10/2008 Chloride 30 mg/L
10/15/2008 Chloride 26 mg/L
11/5/2008 Chloride 25 mg/L
2/2/2009 Chloride 29 mg/L
3/4/2009 Chloride 30 mg/L
5/13/2009 Chloride 32 mg/L
6/24/2009 Chloride 31 mg/L
9/15/2009 Chloride 33 mg/L
10/14/2009 Chloride 32 mg/L
12/16/2009 Chloride 34 mg/L
2/17/2010 Chloride 38 mg/L
4/20/2010 Chloride 30 mg/L
6/14/2010 Chloride 32 mg/L
8/16/2010 Chloride 28 mg/L
11/10/2010 Chloride 35 mg/L
4/1/2011 Chloride 33 mg/L
5/25/2011 Chloride 31 mg/L
8/16/2011 Chloride 33 mg/L
Page 2 of 4
Appendix C-3
Source Assessment Report for Gross Alpha in MW-32
White Mesa Uranium Mill
Appendix C-3: MW-32 Indicator Parameter Data Used in Statistical Analysis
Date Sampled Parameter Results Units Lab Qualifier
10/3/2011 Chloride 34 mg/L
11/16/2011 Chloride 32 mg/L
4/30/2012 Chloride 33 mg/L
6/4/2012 Chloride 32 mg/L
9/5/2012 Chloride 33 mg/L D
10/10/2012 Chloride 35 mg/L D
11/6/2012 Chloride 32.1 mg/L
2/13/2013 Chloride 34.3 mg/L
5/13/2013 Chloride 32.3 mg/L
6/18/2013 Chloride 34.9 mg/L
9/4/2013 Chloride 33 mg/L
9/13/2002 Fluoride 0.3 mg/L
3/30/2005 Fluoride 0.2 mg/L
6/23/2005 Fluoride 0.15 mg/L
9/22/2005 Fluoride 0.13 mg/L
12/14/2005 Fluoride 0.18 mg/L
3/22/2006 Fluoride 0.17 mg/L
6/21/2006 Fluoride 0.2 mg/L
9/13/2006 Fluoride 0.21 mg/L
3/16/2007 Fluoride 0.21 mg/L
8/21/2007 Fluoride 0.25 mg/L
10/24/2007 Fluoride 0.18 mg/L
3/12/2008 Fluoride 0.2 mg/L
6/5/2008 Fluoride 0.21 mg/L
8/5/2008 Fluoride 0.2 mg/L
11/5/2008 Fluoride 0.2 mg/L
2/2/2009 Fluoride 0.21 mg/L
5/13/2009 Fluoride 0.21 mg/L
8/19/2009 Fluoride 0.19 mg/L
10/14/2009 Fluoride 0.18 mg/L
4/20/2010 Fluoride 0.18 mg/L
11/10/2010 Fluoride 0.19 mg/L
4/1/2011 Fluoride 0.17 mg/L
10/3/2011 Fluoride 0.22 mg/L
4/30/2012 Fluoride 0.22 mg/L
11/6/2012 Fluoride 0.214 mg/L
5/13/2013 Fluoride 0.208 mg/L
9/13/2002 Sulfate 2070 mg/L
3/30/2005 Sulfate 2320 mg/L D
6/23/2005 Sulfate 2270 mg/L
9/22/2005 Sulfate 2420 mg/L D
12/14/2005 Sulfate 2310 mg/L D
3/22/2006 Sulfate 2390 mg/L D
6/21/2006 Sulfate 2360 mg/L D
Page 3 of 4
Appendix C-3
Source Assessment Report for Gross Alpha in MW-32
White Mesa Uranium Mill
Appendix C-3: MW-32 Indicator Parameter Data Used in Statistical Analysis
Date Sampled Parameter Results Units Lab Qualifier
9/13/2006 Sulfate 2300 mg/L D
10/25/2006 Sulfate 2430 mg/L D
3/16/2007 Sulfate 2410 mg/L D
6/21/2007 Sulfate 2460 mg/L D
8/21/2007 Sulfate 2410 mg/L D
10/24/2007 Sulfate 2400 mg/L D
3/12/2008 Sulfate 2420 mg/L D
6/5/2008 Sulfate 2430 mg/L D
8/5/2008 Sulfate 2470 mg/L D
11/5/2008 Sulfate 2450 mg/L D
2/2/2009 Sulfate 2340 mg/L D
5/13/2009 Sulfate 2440 mg/L D
8/19/2009 Sulfate 1950 mg/L D
10/14/2009 Sulfate 2290 mg/L D
4/20/2010 Sulfate 2390 mg/L D
11/10/2010 Sulfate 2330 mg/L D
4/1/2011 Sulfate 2180 mg/L D
10/3/2011 Sulfate 2370 mg/L D
4/30/2012 Sulfate 2130 mg/L D
6/23/2005 Uranium 1.83 µg/L
9/22/2005 Uranium 2.05 µg/L
12/14/2005 Uranium 2.16 µg/L
3/22/2006 Uranium 2.66 µg/L
4/25/2006 Uranium 2.36 µg/L
5/26/2006 Uranium 2.5 µg/L
6/21/2006 Uranium 4.23 µg/L
9/13/2006 Uranium 2.95 µg/L
10/25/2006 Uranium 2.48 µg/L
3/16/2007 Uranium 2.42 µg/L
10/24/2007 Uranium 3.91 µg/L
3/12/2008 Uranium 3.01 µg/L
6/5/2008 Uranium 3.05 µg/L
8/5/2008 Uranium 2.7 µg/L
11/5/2008 Uranium 2.55 µg/L
2/2/2009 Uranium 2.53 µg/L
5/13/2009 Uranium 2.54 µg/L
8/19/2009 Uranium 2.35 µg/L
10/14/2009 Uranium 2.5 µg/L
4/20/2010 Uranium 2.17 µg/L
11/10/2010 Uranium 2.11 µg/L
4/1/2011 Uranium 2.08 µg/L
8/30/2011 Uranium 2.39 µg/L
10/3/2011 Uranium 0.58 µg/L
4/30/2012 Uranium 1.88 µg/L
Page 4 of 4
Appendix C-3
Source Assessment Report for Gross Alpha in MW-32
White Mesa Uranium Mill
Appendix C-3: MW-32 Indicator Parameter Data Used in Statistical Analysis
Date Sampled Parameter Results Units Lab Qualifier
11/6/2012 Uranium 1.9 µg/L
5/13/2013 Uranium 1.52 µg/L
Notes:
mg/L = milligrams per liter
ug/L = micrograms per liter
D = Reporting limit increased due to sample matrix interference
Page 1 of 1
AppendixC-4
Source Assessment Report for Gross Alpha in MW-32
White Mesa Uranium Mill
Appendix C-4: MW-32 Indicator Parameter Data Omitted from Statistical Analysis
Date
Sampled Parameter Result
Report
Units
Lab
Qualifier
Lab
Detection
Limit Reason
8/19/2009 Chloride 48 mg/L 1 extreme outlier
10/6/2010 Chloride 24 mg/L 1 extreme outlier
2/23/2011 Chloride 40 mg/L 1 extreme outlier
1/18/2012 Chloride 21 mg/L 1 extreme outlier
10/25/2006 Fluoride 0.34 mg/L 0.1 extreme outlier
6/21/2007 Fluoride 0.32 mg/L extreme outlier
11/6/2012 Sulfate 1710 mg/L 1000 extreme outlier
5/13/2013 Sulfate 1800 mg/L 500 extreme outlier
6/21/2007 Uranium 5.74 µg/L 0.3 extreme outlier
8/21/2007 Uranium 5.15 µg/L 0.3 extreme outlier
Notes:
mg/L = milligrams per liter
µg/L = micrograms per liter
Page 1 of 2
Appendix C-5
Source Assessment Report for Gross Alpha in MW-32
White Mesa Uranium Mill
Appendix C-5: Box Plots for Indicator Parameters in MW-32
Box Plot for Chloride in MW-32
15
20
25
30
35
40
45
50
Ch
l
o
r
i
d
e

(
m
g
/
L
)
Median = 32
25%-75% = (31, 33)
1%-99% = (21, 48)
Outliers
Extremes
Box Plot for Fluoride in MW-32
0.12
0.14
0.16
0.18
0.20
0.22
0.24
0.26
0.28
0.30
0.32
0.34
0.36
Fl
u
o
r
i
d
e

(
m
g
/
L
)
Median = 0.2
25%-75% = (0.18, 0.2133)
1%-99% = (0.13, 0.3443)
Outliers
Extremes
Page 2 of 2
Appendix C-5
Source Assessment Report for Gross Alpha in MW-32
White Mesa Uranium Mill
Box Plot for Sulfate in MW-32
1600
1700
1800
1900
2000
2100
2200
2300
2400
2500
2600
Su
l
f
a
t
e

(
m
g
/
L
)
Median = 2365
25%-75% = (2280, 2420)
1%-99% = (1710, 2470)
Outliers
Extremes
Box Plot for Uranium in MW-32
0
1
2
3
4
5
6
Ur
a
n
i
u
m

(
u
g
/
L
)
Median = 2.48
25%-75% = (2.11, 2.7)
1%-99% = (0.58, 5.74)
Outliers
Extremes
Page 1 of 2
Appendix C-6
Source Assessment Report for Gross Alpha in MW-32
White Mesa Uranium Mill
Appendix C-6: Histograms for Indicator Parameters in MW-32
Histogram for Chloride in MW-32
SW-W = 0.912, p = 0.0007
1.36 1.38 1.40 1.42 1.44 1.46 1.48 1.50 1.52 1.54 1.56 1.58 1.60
Log Result
0
2
4
6
8
10
12
14
16
18
20
22
24
26
28
No

o
f

o
b
s
Histogram for Fluoride in MW-32
SW-W = 0.9275, p = 0.0677
-0.95 -0.90 -0.85 -0.80 -0.75 -0.70 -0.65 -0.60 -0.55 -0.50 -0.45
Log Result
0
2
4
6
8
10
12
14
16
No

o
f

o
b
s
Page 2 of 2
Appendix C-6
Source Assessment Report for Gross Alpha in MW-32
White Mesa Uranium Mill
Histogram for Sulfate in MW-32
SW-W = 0.8094, p = 0.0003
3.27 3.28 3.29 3.30 3.31 3.32 3.33 3.34 3.35 3.36 3.37 3.38 3.39 3.40 3.41
Log Result
0
1
2
3
4
5
6
7
8
9
10
No

o
f

o
b
s
Histogram for Uranium in MW-32
SW-W = 0.7887, p = 0.00009
-0.4 -0.3 -0.2 -0.1 0.0 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8
Log Result
0
2
4
6
8
10
12
14
No

o
f

o
b
s
Page 1 of 2
Appendix C-7
Source Assessment Report for Gross Alpha in MW-32
White Mesa Uranium Mill
Appendix C-7: Linear Regressions for Lognormally or Normally
Distributed Constituents
Linear Regression for Chloride in MW-32
r = 0.1406, p = 0.3060; r2 = 0.0198
4/19/20019/1/20021/14/20045/28/200510/10/20062/22/20087/6/200911/18/20104/1/20128/14/201312/27/2014
Date Sampled
24
26
28
30
32
34
36
38
40
Ch
l
o
r
i
d
e

(
m
g
/
L
)
Linear Regression for Fluoride in MW-32
r = -0.0472, p = 0.8189; r2 = 0.0022
4/19/2001
9/1/2002
1/14/2004
5/28/2005
10/10/2006
2/22/2008
7/6/2009
11/18/2010
4/1/2012
8/14/2013
12/27/2014
Date Sampled
0.12
0.14
0.16
0.18
0.20
0.22
0.24
0.26
0.28
0.30
0.32
Fl
u
o
r
i
d
e

(
m
g
/
L
)
Page 2 of 2
Appendix C-7
Source Assessment Report for Gross Alpha in MW-32
White Mesa Uranium Mill
Linear Regression for Sulfate in MW-32
r = -0.0521, p = 0.8006; r2 = 0.0027
4/19/2001
9/1/2002
1/14/2004
5/28/2005
10/10/2006
2/22/2008
7/6/2009
11/18/2010
4/1/2012
8/14/2013
Date Sampled
1900
2000
2100
2200
2300
2400
2500
Su
l
f
a
t
e

(
m
g
/
L
)
Linear Regression for Uranium in MW-32
r = -0.4656, p = 0.0144; r2 = 0.2168
1/14/2004
5/28/2005
10/10/2006
2/22/2008
7/6/2009
11/18/2010
4/1/2012
8/14/2013
12/27/2014
Date Sampled
0.0
0.5
1.0
1.5
2.0
2.5
3.0
3.5
4.0
4.5
Ura
n
i
u
m

(
u
g
/
L
)
Page 1 of 2
Appendix C-8
Source Assessment Report for Gross Alpha in MW-32
White Mesa Uranium Mill
Mann-Kendall Trend Test Analysis
1/9/2014 2:50:58 PM
WorkSheet_a.wst
OFF
0.95
0.05
55
25
38
31.9
31.82
32
2.247
0.303
132
1.645
135.8
0.965
0.167
26
1950
2470
2336
2333
2380
127.6
25.02
1
1.645
45.32
0
Appendix C-8: Mann-Kendall Trend Test for Constituents not Normally or
Lognormally Distributed
Mann-Kendall Test
Test Value (S)
Critical Value (0.05)
Standard Deviation of S
Standardized Value of S
Median
Standard Deviation
Result-sulfate
General Statistics
Number of Values
Minimum
SEM
SEM
Mann-Kendall Test
Test Value (S)
Critical Value (0.05)
Standard Deviation of S
Standardized Value of S
Approximate p-value
Insufficient evidence to identify a significant
trend at the specified level of significance.
Maximum
Mean
Geometric Mean
Full Precision
User Selected Options
Date/Time of Computation
From File
Standard Deviation
Confidence Coefficient
Level of Significance
Result-chloride
General Statistics
Number of Values
Minimum
Maximum
Mean
Geometric Mean
Median
Page 2 of 2
Appendix C-8
Source Assessment Report for Gross Alpha in MW-32
White Mesa Uranium Mill
Mann-Kendall Trend Test Analysis
1/9/2014 2:50:58 PM
WorkSheet_a.wst
OFF
0.95
Appendix C-8: Mann-Kendall Trend Test for Constituents not Normally or
Lognormally Distributed
Full Precision
User Selected Options
Date/Time of Computation
From File
Confidence Coefficient
0.5
Insufficient evidence to identify a significant
trend at the specified level of significance.
27
0.58
4.23
2.423
2.307
2.42
0.688
0.132
-106
-1.645
47.96
-2.189
0.0143
Statistically significant evidence of a decreasing
trend at the specified level of significance.
Approximate p-value
Mean
Geometric Mean
Median
Standard Deviation
SEM
Mann-Kendall Test
Test Value (S)
Critical Value (0.05)
Standard Deviation of S
Standardized Value of S
Maximum
General Statistics
Number of Values
Minimum
Approximate p-value
Result-uranium

APPENDIX D
Time Concentration Plots Compared to Background Report Plots
Appendix D: Time Concentration Plots Compared to Background Report Plots
Page 1 of 5
Appendix D
Source Assessment Report for Gross Alpha in MW-32
White Mesa Uranium Mill
SAR Trend Plot
Background Report Trend Plot
Linear Regression for Gross Alpha minus Rn and U in MW-32
r = 0.1966, p = 0.2121; r2 = 0.0387
1/14/2004 5/28/2005 10/10/2006 2/22/2008 7/6/2009 11/18/2010 4/1/2012 8/14/2013 12/27/2014
Date Sampled
0
1
2
3
4
5
6
7
8
9
10
Gr
o
s
s

A
l
p
h
a

(
p
C
i
/
L
)
Linear Regression for Gross Alpha Minus Rn & U in MW-32
100% Detected
r2 = 0.1849; r = -0.4299, p = 0.2877
2/17/05 5/28/05 9/5/05 12/14/05 3/24/06 7/2/06 10/10/06 1/18/07 4/28/07 8/6/07
Date
0.8
1.0
1.2
1.4
1.6
1.8
2.0
2.2
2.4
2.6
2.8
3.0
3.2
Gr
o
s
s

A
l
p
h
a

m
i
n
u
s

R
n

&

U

(
p
C
i
/
L
)
Detected Values
Non-Detect Values
Appendix D: Time Concentration Plots Compared to Background Report Plots
Page 2 of 5
Appendix D
Source Assessment Report for Gross Alpha in MW-32
White Mesa Uranium Mill
SAR Trend Plot
Background Report Trend Plot
Linear Regression for Chloride in MW-32
r = 0.1406, p = 0.3060; r2 = 0.0198
4/19/20019/1/20021/14/20045/28/200510/10/20062/22/20087/6/200911/18/20104/1/20128/14/201312/27/2014
Date Sampled
24
26
28
30
32
34
36
38
40
Ch
l
o
r
i
d
e

(
m
g
/
L
)
Linear Regression for Chloride in MW-32
100% Detected
r2 = 0.0840; r = -0.2898, p = 0.3874
5/24/02
12/10/02
6/28/03
1/14/04
8/1/04
2/17/05
9/5/05
3/24/06
10/10/06
4/28/07
11/14/07
Date
29.5
30.0
30.5
31.0
31.5
32.0
32.5
33.0
33.5
34.0
34.5
Ch
l
o
r
i
d
e

(
m
g
/
L
)
Detected Values
Non-Detect Values
Appendix D: Time Concentration Plots Compared to Background Report Plots
Page 3 of 5
Appendix D
Source Assessment Report for Gross Alpha in MW-32
White Mesa Uranium Mill
SAR Trend Plot
Background Report Trend Plot
Linear Regression for Fluoride in MW-32
r = -0.0472, p = 0.8189; r2 = 0.0022
4/19/20019/1/20021/14/20045/28/200510/10/20062/22/20087/6/200911/18/20104/1/20128/14/201312/27/2014
Date Sampled
0.12
0.14
0.16
0.18
0.20
0.22
0.24
0.26
0.28
0.30
0.32
Fl
u
o
r
i
d
e

(
m
g
/
L
)
Linear Regression for Fluoride in MW-32
100% Detected
r2 = 0.0089; r = -0.0941, p = 0.7832
5/24/02
12/10/02
6/28/03
1/14/04
8/1/04
2/17/05
9/5/05
3/24/06
10/10/06
4/28/07
11/14/07
Date
0.08
0.10
0.12
0.14
0.16
0.18
0.20
0.22
0.24
0.26
0.28
0.30
0.32
Fl
u
o
r
i
d
e

(
m
g
/
L
)
Detected Values
Non-Detect Values
Appendix D: Time Concentration Plots Compared to Background Report Plots
Page 4 of 5
Appendix D
Source Assessment Report for Gross Alpha in MW-32
White Mesa Uranium Mill
SAR Trend Plot
Background Report Trend Plot
Linear Regression for Sulfate in MW-32
r = -0.0521, p = 0.8006; r2 = 0.0027
4/19/2001 9/1/2002 1/14/20045/28/200510/10/20062/22/2008 7/6/200911/18/20104/1/2012 8/14/2013
Date Sampled
1900
2000
2100
2200
2300
2400
2500
Su
l
f
a
t
e

(
m
g
/
L
)
Linear Regression for Sulfate in MW-32
100% Detected
r2 = 0.7883; r = 0.8878, p = 0.0003
5/24/02
12/10/02
6/28/03
1/14/04
8/1/04
2/17/05
9/5/05
3/24/06
10/10/06
4/28/07
11/14/07
Date
2050
2100
2150
2200
2250
2300
2350
2400
2450
2500
Su
l
f
a
t
e

(
m
g
/
L
)
Detected Values
Non-Detect Values
Appendix D: Time Concentration Plots Compared to Background Report Plots
Page 5 of 5
Appendix D
Source Assessment Report for Gross Alpha in MW-32
White Mesa Uranium Mill
SAR Trend Plot
Background Report Trend Plot
Linear Regression for Uranium in MW-32
r = -0.4656, p = 0.0144; r2 = 0.2168
1/14/2004 5/28/2005 10/10/2006 2/22/2008 7/6/2009 11/18/2010 4/1/2012 8/14/2013 12/27/2014
Date Sampled
0.0
0.5
1.0
1.5
2.0
2.5
3.0
3.5
4.0
4.5
Ura
n
i
u
m

(
u
g
/
L
)
Linear Regression for Uranium in MW-32
100% Detected
r2 = 0.1460; r = 0.3821, p = 0.2203
2/17/05 5/28/05 9/5/05 12/14/05 3/24/06 7/2/06 10/10/06 1/18/07 4/28/07 8/6/07
Date
0
1
2
3
4
5
6
Ura
n
i
u
m

(
u
g
/
L
)
Detected Values
Non-Detected Values

APPENDIX E
Flowsheet
(Groundwater Data Preparation and Statistical Process Flow for
Calculating Groundwater Protection Standards, White Mesa Mill Site
(INTERA, 2007))
Negative Value?
Zero Value?
Truncated Value?
Duplicate Value?
Units Consistant?
Non-detects Exceeding Criteria Specified by URS Memo*
Analysis Internally Consistent?(TDS and Charge Balance Check)
YesNo
No
Yes
No
No
No
Yes
Yes
No
Yes
Yes
Yes
Radionuclide?
Yes
Remove from DatasetDetection Limit and U-Flag Data Qualifier NoNo
Review for Units
Remove from Dataset
If chloride, sulfate, or TDS, Remove from Dataset
Correct Value Confirmed?
Remove from
Dataset
Remove from Dataset
Determine Percentage Non-Detects in Remaining Data
Plot Data Sets as Box Plots to Identify Extreme Values As Specified in Background Report. Extreme Value?
No Remove from
Dataset
Yes
At Least 8 Data Points Remaining?
Defer Analysis Until Eight
Data Points Avalible
0-15 Percent Non-Detects >15-50 Percent Non-Detects >90 Percent Non-Detects
No
Yes
No
Substitute One Half of Detection Limit
Log Transform Data
Use Probability Plots to
Determine if Cohen’s or Aitchison’s Method
Calculate Descriptive Statistics
(Redo Tables In Background Report)
Screen for Trends Using Least Squares Regression.
Calculate GWCL (Mean
+2Sigma)
Calculate Descriptive Statistics
(Redo Tables In Background Report)
Yes
No
Calculate GWCL (Mean +2Sigma)
Calculate GWCL Using Greater of Fraction Approach under UAC R317-6-4-4.5(B)(2) or 4.6(B)(2) or Poisson Prediction Limit
Yes
No
>50-90 Percent Non-Detects
Calculate Upper Prediction Limit (Highest Historical Value)
Calculate GWCL Using Greater of Fraction Approach under UAC R317-6-4-4.5(B)(2) or 4.6(B)(2) or the Highest Historic Value
Estimate Mean and Standard
Deviation
Screen for Trends Using Mann-Kendall Screen for Trends Using Mann-Kendall
Yes
Use Non-Parametric StatisticsNo
Screen for Trends Using Least Squares Regression
Groundwater Data Preparation and Statistical Process Flow for
Calculating Groundwater Protection Standards, White Mesa Mill Site, San Juan County, Utah
Upward Trend?Upward Trend?
No No
Yes
Consider Modified Approch to GWCL
Upward Trend?Upward Trend?
No No
Yes
Consider Modified Approch to GWCL
Log Transform Data
Log-Normal or Normal?Shapiro WilkProbability PlotsHistograms
Log-Normal or Normal?Shapiro WilkProbability PlotsHistograms
*A non-detect considered “insensitive” will be the maximum reporting limit in a dataset and will exceed other non-detects by, for example, an order of magnitude (e.g., <10 versus <1.0 µg/L). In some cases, insensitive non-detects may also exceed detectable values in a
dataset (e.g., <10 versus 3.5 µg/L).
Groundwater Data Preparation and Statistical Process Flow for Calculating Ground Water Compliance Limits, White Mesa Mill Site, SanJuan County, Utah.
Database of Wells and Analytes Listed in the Statement of Basis

APPENDIX F
Input and Output Files (Electronic Only)