DRC-2016-005463 - 0901a06880619bec

ENERG Y FUELS
Energy Fuels Resources (USA) Inc.
225 Union Blvd. Suite 600
Lakewood, CO, US, 80228
303 974 2140
www.energyfuels.com
VIA EMAIL AND EXPRESS DELIVERY Div of Waste Management
and Radiation Control
Mr. Bryce Bird
Director, Utah Division of Air Quality
March 21,2016 mar 23,2016
DRC-ZOlt- OOS443
State of Utah Department of Environmental Quality
195 North 1950 West
Salt Lake City, UT 84116
Re: White Mesa Uranium Mill,
National Emissions Standards for Radon Emission from Operating Mill Tailings
Transmittal of 2015 Annual Radon Flux Monitoring Report for Tailings Impoundment 3
Dear Mr. Bird:
This letter transmits Energy Fuels Resources (USA) Inc.’s (“EFRI’s”) radon-222 flux monitoring report
for the year 2015 for tailings impoundment 3 (“Cell 3”) at the White Mesa Uranium Mill (the “Mill”).
The result of the 2015 radon-222 flux monitoring for Cell 3 was 13.3 pCi/(m2-sec) (averaged over the
four quarterly monitoring events) and therefore was in compliance with the standard set out in 40 CFR
61.252 of 20 pCi/(m2-sec) in 2015. As shown on the attached Table 1, all of the results from the
quarterly monitoring events were less than the 20 pCi/(m2-sec) standard.
Per 40 CFR 61.253, EFRI is permitted to monitor radon flux one or more times per year. For the 2015
operating year, EFRI chose to monitor Cell 3 quarterly as indicated in a letter to the Utah Division of Air
Quality and the U.S Environmental Protection Agency on March 30, 2015. Therefore, Cell 3 was
monitored on January 27, 2015, May 11, 2015, July 21, 2015, and October 12, 2015. Consistent with 40
CFR 61.253, EFRI notified the Utah Division of Air Quality and the U.S Environmental Protection
Agency 30 days prior to each Cell 3 sampling event, as required, in letters dated December 22, 2014,
March 30, 2015, June 17, 2015, and September 9, 2015.
The results from the Cell 3 January 2015, May 2015, July 2015, and October 2015 sampling events are
included as Attachment 1, Attachment 2, Attachment 3, and Attachment 4, respectively, to this letter.
Please contact me at 303-389-4167 should you have any questions or need additional information.
Sincerely,
Energy Fuels Resources (USA) Inc.
Jaime Massey
Regulatory Compliance Specialist
S:\Environmental\UT\WhiteMesaMill\Required Reports\NESHAPS Reports\Cell 3 2015 Annual Report.doc
Letter to B. Bird
March 21, 2016
Page 2
cc: David C. Frydenlund
Phil Goble, Utah DWMRC
Logan Shumway /
Scott Anderson, Utah DWMRC V
Jay Morris, Utah DAQ
Harold R. Roberts
David E. Turk
Kathy Weinel
Scott Bakken
Director, Air and Toxics Technical Enforcement Program, Office of Enforcement, Compliance
and Environmental Justice, U. S. Environmental Protection Agency
Letter to B. Bird
March 21, 2016
Page 3
Certification:
“I certify under penalty of law that I have personally examined and am familiar with the
information submitted herein and based on my inquiry of those individuals immediately
responsible for obtaining the information, I believe that the submitted information is true,
accurate, and complete. I am aware that there are significant penalties for submitting
false information including the possibility of fine and imprisonment. See, 18 U.S.C.
Harold R. Roberts
Executive Vice President Conventional Operations
Table 1
Cell 3 Quarterly Radon Flux Sampling
Sampling Event Result (pCi/(m2 -sec))Sampling Dates
First Quarter 13.5 January 27 - 29, 2015
Second Quarter 11.3 May 11 - 13,2015
Third Quarter 12.8 July 21 - 23, 2015
Fourth Quarter 15.6 October 12-14, 2015
2015 Average 13.3
ATTACHMENT 1
Tellco Report for Radon Flux Monitoring
January 2015
National Emission Standards for Hazardous Air Pollutants
2015 Radon Flux Measurement Program
White Mesa Mill
6425 South Highway 191
Blanding, Utah 84511
1st Quarter 2015 Sampling Results
Cell 3
Prepared for: Energy Fuels Resources (USA) Inc.
6425 S. Highway 191
P.O. Box 809
Blanding, Utah 84511
Prepared by: Tellco Environmental
P.O. Box 3987
Grand Junction, Colorado 81502
TABLE OF CONTENTS
Page
1. INTRODUCTION....................................................................................................................................................1
2. SITE DESCRIPTION...........................................................................................................................................1
3. REGULATORY REQUIREMENTS FOR THE SITE..................................................................................1
4. SAMPLING METHODOLOGY.........................................................................................................................2
5. FIELD OPERATIONS...........................................................................................................................................2
5.1 Equipment Preparation............................................................................................................................2
5.2 Sample Locations, Identification, and Placement.........................................................................3
5.3 Sample Retrieval.....................................................................................................................................3
5.4 Environmental Conditions...................................................................................................................4
6. SAMPLE ANALYSIS............................................................................................................................................4
6.1 Apparatus....................................................................................................................................................4
6.2 Sample Inspection and Documentation............................................................................................4
6.3 Background and Sample Counting.....................................................................................................4
7. QUALITY CONTROL (QC) AND DATA VALIDATION.......................................................................5
7.1 Sensitivity..................................................................................................................................................5
7.2 Precision................................ 5
7.3 Accuracy.....................................................................................................................................................6
7.4 Completeness............................................................................................................................................6
8. CALCULATIONS....................................................................................................................................................6
9. RESULTS...................................................................................................................................................................7
9.1 Mean Radon Flux.....................................................................................................................................7
9.2 Site Results.................................................................................................................................................8
References........................................................................................................................................................................9
Figure 1...........................................................................................................................................................................10
Appendix A. Charcoal Canister Analyses Support Documents
Appendix B. Recount Data Analyses
Appendix C. Radon Flux Sample Laboratory Data, Including Blanks
Appendix D. Sample Locations Map (Figure 2)
1.INTRODUCTION
During January 27-29, 2015 Tellco Environmental, LLC (Tellco) of Grand Junction, Colorado,
provided support to Energy Fuels Resources (USA) Inc. (Energy Fuels) to conduct radon flux
measurements at its White Mesa Mill site regarding the required National Emission Standards for
Hazardous Air Pollutants (NESHAPs) Radon Flux Measurements. These measurements are required
of Energy Fuels to show compliance with Federal Regulations (further discussed in Section 3 below).
The standard is not an average per facility, but is an average per radon source. The standard allows
mill owners or operators the option of either making a single set of measurements or making
measurements over a one year period (e.g., weekly, monthly, or quarterly intervals).
Tellco was contracted to provide radon canisters, equipment, and canister placement personnel as well
as lab analysis of samples. Energy Fuels personnel provided support for loading and unloading
charcoal from the canisters. This report details the procedures employed by Energy Fuels and Tellco
to obtain the results presented in Section 9.0 of this report. This report presents the results of the radon
flux measurements for Cell 3 only; the results of the radon sampling for Cell 2 during January 2015
are presented in a separate report.
2. SITE DESCRIPTION
The White Mesa Mill facility is located in San Juan County in southeastern Utah, six miles south of
Blanding, Utah. The mill began operations in 1980 for the purpose of extracting uranium and
vanadium from feed stocks. Processing effluents from the operation are deposited in lined cells,
which vaiy in depth. Cell 1, Cell 4A, and Cell 4B did not require radon flux sampling, as explained in
Section 3 below.
Cell 2 has a total area of approximately 270,624 square meters (m2) and is comprised of one region
which requires NESHAPs radon flux monitoring. This cell has been filled and covered with interim
soil cover of varying thickness and there are no exposed tailings or standing liquid within Cell 2.
Cell 3 is nearly filled with tailings sand and is undergoing pre-closure activities. This cell has a total
area of 288,858 m2 and is comprised of two source regions that require NESHAPs radon flux
monitoring: approximately 258,262 m2 of interim soil cover of varying thickness and approximately
20,442 m2 of exposed tailings "beaches". The remaining approximately 10,154 m2 was covered by
standing liquid in lower elevation areas. The size of the standing liquid region is getting smaller as the
tailings are being pushed out into the standing liquid region.
3. REGULATORY REQUIREMENTS FOR THE SITE
Radon emissions from the uranium mill tailings at this site are regulated by the State of Utah’s
Division of Radiation Control and administered by the Utah Division of Air Quality under generally
applicable standards set by the Environmental Protection Agency (EPA) for Operating Mills.
Applicable regulations are specified in 40 CFR Part 61, Subpart W, National Emission Standards for
Radon Emissions from Operating Mill Tailings, with technical procedures in Appendix B. At present,
there are no Subpart T uranium mill tailings at this site. These regulations are a subset of the
NESHAPs. According to subsection 61.252 Standard, (a) radon-222 emissions to ambient air from an
1
existing uranium mill tailings pile shall not exceed an average of 20 pCi/m2-s for each pile, or cell.
Subsection 61.253, Determining Compliance, states that: "Compliance with the emission standard in
this subpart shall be determined annually through the use of Method 115 of Appendix B." The
repaired Cell 4A, and newly constructed Cell 4B, were both constructed after December 15, 1989
and each was constructed with less than 40 acres surface area. Cell 4A and 4B comply with the
requirements of 40 CFR 61.252(b), therefore no radon flux measurements are required on either
Cell 4A or 4B. Cell 1 is completely covered with standing liquid and therefore no radon flux
measurements are required on Cell 1.
4. SAMPLING METHODOLOGY
Radon emissions were measured using Large Area Activated Charcoal Canisters (canisters) in
conformance with 40 CFR, Part 61, Appendix B, Method 115, Restrictions to Radon Flux
Measurements, (EPA, 2014). These are passive gas adsorption sampling devices used to determine
the flux rate of radon-222 gas from a surface. The canisters were constructed using a 10-inch
diameter PVC end cap containing a bed of 180 grams of activated, granular charcoal. The prepared
charcoal was placed in the canisters on a support grid on top of a 'A inch thick layer of foam and
secured with a retaining ring under 1 Vi inches of foam (see Figure 1, page 11).
Two hundred sampling locations were distributed throughout Cell 3 (comprised of two source regions
requiring monitoring) as depicted on the Sample Locations Map (see Figure 2, Appendix D). Each
charged canister was placed directly onto the surface (open face down) and exposed to the surface for
24 hours. Radon gas adsorbed onto the charcoal and the subsequent radioactive decay of the
entrained radon resulted in radioactive lead-214 and bismuth-214. These radon progeny isotopes emit
characteristic gamma photons that can be detected through gamma spectroscopy. The original total
activity of the adsorbed radon was calculated from these gamma ray measurements using calibration
factors derived from cross-calibration of standard sources containing known total activities of
radium-226 with geometry identical to the counted samples and from the principles of radioactive
decay.
After approximately 24 hours, the exposed charcoal was transferred to a sealed plastic sample
container (to prevent radon loss and/or further exposure during transport), identified and labeled, and
transported to the Tellco laboratory in Grand Junction, Colorado for analysis. Upon completion of on­
site activities, the field equipment was alpha and beta-gamma scanned for possible contamination
resulting from fieldwork activities. All field equipment was surveyed by Energy Fuels Radiation
Safety personnel and released for unrestricted use. Tellco personnel maintained custody of the
samples from collection through analysis.
5. FIELD OPERATIONS
5.1 Equipment Preparation
All charcoal was dried at 110°C before use in the field. Unused charcoal and recycled charcoal were
treated the same. 180-gram aliquots of dried charcoal were weighed and placed in sample containers.
Proper balance operation was verified daily by checking a standard weight. The balance readout
agreed with the known standard weight to within ±0.1 percent.
2
After acceptable balance check, empty containers were individually placed on the balance and the
scale was re-zeroed with the container on the balance. Unexposed and dried charcoal was carefully
added to the container until the readout registered 180 grams. The lid was immediately placed on the
container and sealed with plastic tape. The balance was checked for readout drift between readings.
Sealed containers with unexposed charcoal were placed individually in the shielded counting well,
with the bottom of the container centered over the detector, and the background count rate was
documented. Three five-minute background counts were conducted on ten percent of the containers,
selected at random to represent the "batch". If the background counts were too high to achieve an
acceptable lower limit of detection (LLD), the entire charcoal batch was labeled non-conforming and
recycled through the heating/drying process.
5.2 Sample Locations, Identification, and Placement
On January 27, 2015, one hundred sampling locations were distributed throughout the Cell 3 beaches
region; and on January 28,2015, one hundred sampling locations were distributed throughout the Cell
3 covered regions. A sample identification number (ID) was assigned to every sample point, using a
sequential alphanumeric system indicating the charcoal batch and physical location within the region
(e.g., BO 1... Cl 00). This ID was written on an adhesive label and affixed to the top of the canister.
The sample ID, date, and time of placement were recorded on the radon flux measurements data
sheets for the set of one hundred measurements.
Prior to placing a canister at each sample location, the retaining ring, screen, and foam pad of each
canister were removed to expose the charcoal support grid. A pre-measured charcoal charge was
selected from a batch, opened and distributed evenly across the support grid. The canister was then
reassembled and placed face down on the surface at each sampling location. Care was exercised not
to push the device into the soil surface. The canister rim was “sealed” to the surface using a berm of
local borrow material.
Five canisters (blanks) were similarly processed for each sample set (ten blanks total) and the
canisters were kept inside an airtight plastic bag during the 24-hour testing period.
5.3 Sample Retrieval
At the end of each of the 24-hour testing periods, the canisters were retrieved, disassembled and each
charcoal sample was individually poured through a funnel into a container. Identification numbers
were transferred to the appropriate container, which was sealed and placed in a box for transport.
Retrieval date and time were recorded on the same data sheets as the sample placement information.
The blank samples were similarly processed. All of the radon flux samples and blanks were
successfully retrieved and containerized during the unloading process.
Tellco personnel maintained custody of the samples from collection through analysis.
3
5.4 Environmental Conditions
A rain gauge and thermometer were placed by Cell 3 to monitor rainfall and air temperatures during
sampling in order to ensure compliance with the regulatory measurement criteria.
In accordance with 40 CFR, Part 61, Appendix B, Method 115:
• Measurements were not initiated within 24 hours of rainfall.
• There was no rainfall during either of the 24-hour sampling periods.
• All of the canister seals remained intact during each of the 24-hour sampling periods.
• The criteria regarding minimum air temperature and frozen ground are not applicable when
performing sampling on a quarterly basis; however, the minimum ambient air temperature
of 30 degrees F was measured during the sampling of the Cell 3 beach region. The ground
was not frozen.
6. SAMPLE ANALYSIS
6.1 Apparatus
Apparatus used for the analysis:
• Single- or multi-channel pulse height analysis system, Ludlum Model 2200 with a
Teledyne 3" x 3" sodium iodide, thallium-activated (Nal(Tl)) detector.
• Lead shielded counting well approximately 40 cm deep with 5-cm thick lead walls and a 7-
cm thick base and 5 cm thick top.
• National Institute of Standards and Technology (NIST) traceable aqueous solution radium-
226 absorbed onto 180 grams of activated charcoal.
• Ohaus Model C501 balance with 0.1 -gram sensitivity.
6.2 Sample Inspection and Documentation
Once in the laboratory, the integrity of each charcoal container was verified by visual inspection of the
plastic container. Laboratory personnel checked for damaged or unsealed containers and verified that
the data sheet was complete.
No damaged or unsealed containers were observed during inspection at the Tellco analytical
laboratory. All 200 samples and ten blanks were ultimately validated after inspection.
6.3 Background and Sample Counting
The gamma ray counting system was checked daily, including background and radium-226 source
measurements prior to and after each counting session. Based on calibration statistics, using two
sources with known radium-226 content, background and source control limits were established for
each Ludlum/Teledyne counting system with'shielded well (see Appendix A).
4
Gamma ray counting of exposed charcoal samples included the following steps:
• The length of count time was determined by the activity of the sample being analyzed,
according to a data quality objective of a minimum of 1,000 accrued counts for any given
sample.
• The sample container was centered on the Nal detector and the shielded well door was
closed.
• The sample was counted over a determined count length and then the mid-sample count
time, date, and gross counts were documented on the radon flux measurements data sheet
and used in the calculations.
• The above steps were repeated for each exposed charcoal sample.
• Approximately 10 percent of the containers counted were selected for recounting. These
containers were recounted within a few days following the original count.
7. QUALITY CONTROL (QC) AND DATA VALIDATION
Charcoal flux measurement QC samples included the following intra-laboratory analytical frequency
objectives:
• Blanks, 5 percent, and
• Recounts, 10 percent
All sample data were subjected to validation protocols that included assessments of sensitivity,
precision, accuracy, and completeness. As described below, all Method 115-required data quality
objectives (EPA, 2014) were attained.
7.1 Sensitivity
A total of ten blanks were analyzed by measuring the radon progeny activity in samples subjected to
all aspects of the measurement process, excepting exposure to the source region. These blank sample
measurements comprised approximately five percent of the field measurements. The results of the
blank sample radon flux rates ranged from 0.01 to 0.10 pCi/m2-s, with an average of approximately
0.05 pCi/m2-s. The lower limit of detection (LLD) ranged from approximately 0.03 to 0.04 pCi/m2-s.
7.2 Precision
Twenty recount measurements, distributed throughout the sample sets, were performed by replicating
analyses of individual field samples (see Appendix B). These recount measurements comprised
approximately 10 percent of the total number of samples analyzed. The precision of all recount
measurements, expressed as relative percent difference (RPD), ranged from less than 0.1 percent to
13.3 percent with an overall average precision of approximately 2.4 percent RPD. This complies with
the precision objective of 10 percent for samples above 1 pCi/m2-s.
5
7.3 Accuracy
Accuracy of field measurements was assessed daily by counting two laboratory control samples with
known Ra-226 content. Accuracy of these lab control sample measurements, expressed as percent
bias, ranged from approximately -1.3 percent to +1.6 percent. The arithmetic average bias of the lab
control sample measurements was approximately +0.1 percent (see Appendix A). This complies with
the accuracy objective of +/-10 percent.
7.4 Completeness
A combined total of 200 samples (100 samples from the Cell 3 beach region and 100 samples from
the Cell 3 cover regions) were verified, representing 100 percent completeness, which complies with
the completeness objective of 85 percent.
8. CALCULATIONS
Radon flux rates were calculated for charcoal collection samples using calibration factors derived
from cross-calibration to sources with known total activity with identical geometry as the charcoal
containers. A yield efficiency factor was used to calculate the total activity of the sample charcoal
containers. Individual field sample result values presented were not reduced by the results of the field
blank analyses.
In practice, radon flux rates were calculated by a database computer program. The algorithms utilized
by the data base program were as follows:
Equation 8.1:
NpCi Rn-222/m sec = [Xs*A*b*0.5W.»)]
where:N = net sample count rate, cpm under 220-662 keV peak
Ts = sample duration, seconds
b = instrument calibration factor, cpm per pCi; values used:
0.1698, for M-01/D-21 and
0.1703, for M-02/D-20
d = decay time, elapsed hours between sample mid-time and count mid-time
A = area of the canister, m2
Equation 8.2:
Gross Sample, cpm Background Sample, cpm
V Sample Count,t, min Background Count,t,min
Error,2a = 2x-----------------------------------------------x Sample Concentration
Net,cpm
6
Equation 8.3:
LLD =2,71 + (4.65¥Sh)
[Ts*A*b*0.5(d/9I75)]
where: 2.71
4.65
Sb
Ts
b
d
A
= constant
= confidence interval factor
= standard deviation of the background count rate
= sample duration, seconds
= instrument calibration factor, cpm per pCi; values used:
0.1698, for M-01/D-21 and
0.1703, for M-02/D-20
= decay time, elapsed hours between sample mid-time and count mid-time
= area of the canister, m2
9. RESULTS
9.1 Mean Radon Flux
Referencing 40 CFR, Part 61, Subpart W, Appendix B, Method 115 - Monitoring for Radon-222
Emissions, Subsection 2.1.7 - Calculations, "the mean radon flux for each region of the pile and for
the total pile shall be calculated and reported as follows:
(a) The individual radon flux calculations shall be made as provided in Appendix A EPA
86(1). The mean radon flux for each region of the pile shall be calculated by summing all
individual flux measurements for the region and dividing by the total number of flux
measurements for the region.
(b) The mean radon flux for the total uranium mill tailings pile shall be calculated as follows:
JjA^+... la? r+i... jjAi
At
Js = Mean flux for the total pile (pCi/m2-s)
Ji = Mean flux measured in region i (pCi/m2-s)
Aj = Area of region i (m2)
At = Total area of the pile (m2)”
40 CFR 61, Subpart W, Appendix B, Method 115, Subsection 2.1.8, Reporting states “The results of
individual flux measurements, the approximate locations on the pile, and the mean radon flux for each
region and the mean radon flux for the total stack [pile] shall be included in the emission test report. Any
condition or unusual event that occurred during the measurements that could significantly affect the results
should be reported."
Js =
Where:
7
9.2 Site Results
Site Specific Sample Results (reference Appendix C)
(a) The mean radon flux for each region within Cell 3 is as follows:
Cell 3 - Beaches Region = 63.5 pCi/m2-s (based on 20,442 m2 area)
Cell 3 - Covered Region = 10.1 pCi/m2-s (based on 258,262 m2 area)
Cell 3 - Water Region = 0.0 pCi/m2-s (based on 10,154 m2 area)
Note: Reference Appendix C of this report for the entire summary of individual measurement results.
(b) Using the data presented above, the calculated mean radon flux rate for Cell 3 is as follows:
Cell 3= 13.5 pCi/m2-s
f 63.5 V20.442H( 10.1 ¥258.262)+f 0.0V10,154) =13.5
288,858
As shown above, the arithmetic mean radon flux rate for Cell 3 is below the NRC and EPA standard
of 20 pCi/m2-s.
Appendix C is a summary of individual measurement results, including blank sample analysis.
Sample locations are depicted on Figure 2, which is included in Appendix D. The map was produced
by Tellco.
8
References
U. S. Environmental Protection Agency, Radon Flux Measurements on Gardinier and Royster
Phosphogypsum Piles Near Tampa and Mulberry, Florida, EPA 520/5-85-029, NTIS #PB86-
161874, January 1986.
U. S. Environmental Protection Agency, Title 40, Code of Federal Regulations, July 2014.
U. S. Nuclear Regulatory Commission, Radiological Effluent and Environmental Monitoring at
Uranium Mills, Regulatory Guide 4.14, April 1980.
U. S. Nuclear Regulatory Commission, Title 10, Code of Federal Regulations, Part 40, Appendix A,
January 2014.
9
Figure 1
Large Area Activated Charcoal Canisters Diagram
l-in. Tmck1/4 in. vtntHomm ScruttiBf P#d
I/2-.a Thick
strubaar Pad
Raulnw
Sixmo1
1 Thick Chkrcua- SupptxL G»kl
iO-ui.PVC End C«p
F16M8E 1 Large-Arw Radon Col Tic ter
10
Appendix A
Charcoal Canister Analyses Support Documents
A
ACCURACY APPRAISAL TABLE
JANUARY 2015 RADON SAMPLING
ENERGY FUELS RESOURCES
WHITE MESA MILL, BLANDING, UTAH
2015 NESHAPs RADON FLUX MEASUREMENTS
CELL 2 AND CELL 3
SAMPLING DATES: 01/26/15-01/29/15
SYSTEM
I.D.
COUNT
DATE
Bkg Counts
#1
(1 min.
#2
each)
#3
Source Counts (1 min. each)
#1 #2 #3
AVG NET
cpm
YIELD
cpm/pCi
FOUND
pCi
SOURCE
ID
KNOWN
pCi
% BIAS
M-01/D-21 1/30/2015 140 100 131 10244 10315 10083 10090 0.1698 59425 GS-04 59300 0.2%
M-01/D-21 1/30/2015 132 120 133 10219 10166 10335 10112 0.1698 59550 GS-04 59300 0.4%
M-01/D-21 1/31/2015 147 141 132 10094 10131 10290 10032 0.1698 59079 GS-04 59300 -0.4%
M-01/D-21 1/31/2015 107 114 128 10165 10143 10039 9999 0.1698 58889 GS-04 59300 -0.7%
M-01/D-21 2/1/2015 127 123 113 10075 10107 10208 10009 0.1698 58946 GS-04 59300 -0.6%
M-01/D-21 2/1/2015 127 144 136 10224 10086 10023 9975 0.1698 58748 GS-04 59300 -0.9%
M-01/D-21 1/30/2015 140 100 131 10376 10322 10364 10230 0.1698 60249 GS-05 59300 1.6%
M-01/D-21 1/30/2015 132 120 133 10322 10252 10084 10091 0.1698 59429 GS-05 59300 0.2%
M-01/D-21 1/31/2015 147 141 132 10342 10098 10311 10110 0.1698 59543 GS-05 59300 0.4%
M-01/D-21 1/31/2015 107 114 128 10288 10107 10334 10127 0.1698 59639 GS-05 59300 0.6%
M-01/D-21 2/1/2015 127 123 113 10318 10086 10367 10136 0.1698 59694 GS-05 59300 0.7%
M-01/D-21 2/1/2015 127 144 136 10312 10333 10164 10134 0.1698 59682 GS-05 59300 0.6%
M-02/D-20 1/30/2015 128 138 149 10200 10163 10197 10048 0.1703 59004 GS-04 59300 -0.5%
M-02/D-20 1/30/2015 131 137 124 10245 10300 10098 10084 0.1703 59211 GS-04 59300 -0.1%
M-02/D-20 1/31/2015 106 152 131 10126 10120 10200 10019 0.1703 58831 GS-04 59300 -0.8%
M-02/D-20 1/31/2015 142 128 115 10146 10104 10279 10048 0.1703 59002 GS-04 59300 -0.5%
M-02/D-20 2/1/2015 125 130 128 10378 10229 10306 10177 0.1703 59757 GS-04 59300 0.8%
M-02/D-20 2/1/2015 154 118 148 10240 10415 10232 10156 0.1703 59634 GS-04 59300 0.6%
M-02/D-20 1/30/2015 128 138 149 10148 10118 10053 9968 0.1703 58532 GS-05 59300 -1.3%
M-02/D-20 1/30/2015 131 137 124 10291 10268 10225 10131 0.1703 59487 GS-05 59300 0.3%
M-02/D-20 1/31/2015 106 152 131 10187 10252 10336 10129 0.1703 59475 GS-05 59300 0.3%
M-02/D-20 1/31/2015 142 128 115 10218 10245 10142 10073 0.1703 59151 GS-05 59300 -0.3%
M-02/D-20 2/1/2015 125 130 128 10275 10183 10379 10151 0.1703 59609 GS-05 59300 0.5%
M-02/D-20 2/1/2015 154 118 148 10300 10146 10296 10107 0.1703 59350 GS-05 59300 0.1%
AVERAGE PERCENT BIAS FOR ALL ANALYTICAL SESSIONS:0.1%
CHARCOAL CANISTER ANALYSIS SYSTEM
SITE LOCATION: \ftj h \ K'lU^ B l«?l^ dMfj ^ MT
CLIENT: S *R eSO<A<TCg>
Calibration Check Log
System ID: rA-o> f ' Calibration Date: l/lvl I M1 Due Date: U/m/iS
Scaler S/N: _ •=?IS1Q- __ High Voltage: )) 31 Window: 4.42 Thrshld: 2.20
Detector S/N: O *4 I ta 3>~3 Source ID/SN: Source Activity: Kn pC->
Blank Canister Bkgd. Range, cpm: 2a- P) ^ to 1 ^ I3 a = €> 3 to I *7 L*
Gross Source Range, cpm: 2 a = 0 (2 I to ^ ^ 5^9 3 <j= to I ****7 9 3
Technician:
All counts times are one minute.
Date
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W>£ +
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By Background Counts (1 min, each)
#1TTfo #2 #3 Avg.#1
Source Counts (1 min, each)
#2 #3 Average
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735
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I3v 1 0'2-~Z-*--|\6oP,C \0Dx3 jC21L I 2
Y/N: Y = average background and source cpm falls within the control limits.
N = average background and source cpm does not fall within the control limits.
The acceptable ranges were determined from prior background and source check data.
CHARCOAL CANISTER ANALYSIS SYSTEM
SITE LOCATION: \A^ 1m > U *Bi gh ^ ^
CLIENT: ^Y\€»T^-^ FtA-e-^3 £ £OUCCC^
Calibration Check Lob
System ID: NV-oi / p ~ ^_______ Calibration Date: Due Date:_ (/h*t t s
Scaler S/N: 7 ___________ High Voltage: 1137 _ Window: 4.42 Thrshld: 2.20
Detector S/N: £>4153^ __Source 1D/SN: F^/(jtS ~ O-^Source Activity:
Blank Canister Bkgd. Range, cpm: 2 <j =_______0 ^ to I ii ) 3 a = to i 7 0>
Gtoss Source Range, cpm: 2o = 1) to i QS'&z 3g= 4u>i6 to \o-ino)
Technician:
'%?L-
All counts times are one minute.
Vrti
Po^
?r&
Pos t
Prc
Pcs1~
Date
#
TOb°Ls:
l~m u
LL-.
m IdLz.:L£7
S3
2-*2-2J7
Background Counts (1 min, each)
#2 #3 Ayr.#1
Source Counts (1 min, each)
#2 #3 Average
ok?
Y/N
|PC7 \2il Ixj 10^7 Co 1032=^Q3p‘i8£-22.)OPR4
-UZ£i It*mm C>gg)S \ P.3 II
K?lg7 IP33-4
Qlisl
02JJ3
n=±
itH
-U3-
i3U
m LP31g
ic>3n
lOo^
t0333 Afllk&jg-2^7
027^
Y/N: Y = average background and source cpm falls within the control limits.
N = average background and source cpm does not fall within the control limits.
The acceptable ranges were determined from prior background and source check data.
SITE LOCATION:
CHARCOAL CANISTER ANALYSIS SYSTEM
\K\W
CLIENT: fc-A€f^y F^tls _______________________
Calibration Check Log
System ID: bA "* ^ ~ Calibration Date: C* } "2-^1) /*•/ Due Date: J / ^
Scaler S/N: 5~ 15" (j> 3 High Voltage: &SQ Window: 4.42 Thrshld: 2.20
Detector S/N: O H —_____ Source ID/SN: ____J<S~ 3 Source Activity:
0)^>to >55 3 o =Blank Canister Bkgd. Range, cpm: 2 o =__
Gross Source Range, cpm: 2o= S & to I 0 fg '31? 3 o =
Technician:
~~7 7 to I "7 |
to lc3 *5 4 3
All counts times are one minute.
Date
VV,J
Pt>6+
?ce
P(76t
Pr<
Pc^r
sieZ
By
is:
Background Counts (1 min, each)
#1
M
#2 #3
3al
Avg.#1
Source Counts (1 min, each)
#2 #3 Average
ok?
Y/N
/'J 13&-(33 i 0-2.CC?|C?U*3 i o \&n
1 OO^ft
IQLB7
3e/i£13J.i32 ioatts I Q^nO I QOJ-4 I'/3»7»5
ll2tl
±0
ini
I3i
iJSL JJL&.
S.ojD-<*
\0\H\0
~W
\D\'2.0\
XOlOf
I 0-2.00 QlJ±3
J0L3.U t
Ul \2£±i2<r A2Q-i IE S7=8_
WQ
l OV2A tj~3ofr o:*oatV'/isi £2^ms.T5X1 IOT-33. 103-^
Y/N: Y = average background and source cpm falls within the control limits.
N = average background and source cpm does not fall within the control limits.
The acceptable ranges were determined from prior background and source check data.
CHARCOAL CANISTER ANALYSIS SYSTEM
SITE LOCATION
CLIENT: £-1HGL'TC^sj FaA^V-S R. g-SOtAT^
Calibration Check Lop
System ID: ^ Q“2— j 2. P Calibration Date: (/! ^7 f ) Due Date: ) I S'
Scaler S/N: S' ____________High Voltage: Window: 4.42 Thrshld: 2.20
Detector S/N: Q*A 15^- __Source ID/SN: Source Activity: 3 K.|p £.1
Blank Canister Bkgd. Range, cpm: 2 c = _ °) to t S5 3 <r= ~7~7 to l~7 /
Gross Source Range, cpm:2 a =iiis~to IOSH5 3(7= T7S"? to \Q'7C? JL
Technician: ____52^—
All counts times are one minute.
Date
pr*
Pc>£.+
P
Post
P~-
PoSf
iZieZu
By Background Counts (1 min, each)
#1
Vi)
W
#2
WL
[5
r5
L4
Avg.
pa
13^-
#1oTtjB
1^°))
Source Counts (1 min, each)
#2
ions
i Create 10-2--2C
#3
iOQS3lOIOL?
Average
-OZtoJ
ok?
Y/N
3Uli
mi
L30.7 JJ22.>o^L \Q?srfi
zipMis.
>/i A?ifS:
ix#103.1
10X7£( 02.m<
10163.
)PXOX-
ion^
Ai M4&.[0300 tOW>i 1Q.-XH7
Y/N: Y = average background and source cpm falls within the control limits.
N = average background and source cpm does not fall within the control limits.
The acceptable ranges were determined from prior background and source check data.
BALANCE OPERATION DAILY CHECK
Balance Model: Oi/\qb^ O1^230 7
Standard Weight la): 300*0
Date Pre-check (g)Post-check (g)O.K. ± 0.1 % ?By
l~Zo /1 S'l-P)0!-0)3oo.o Hi
h>* /ib *3>oo ,o Hi.
v-joi //T 3>°0'D ■JOO.D
Appendix B
Recount Data Analyses
B
PILE: 3 BATCH: B SURFACE: TAILINGS AIR TEMP MIN: 30°F WEATHER: CLEAR, NO RAIN
AREA: BEACH DEPLOYED: 1 27 15 RETRIEVED: 1 28 15 CHARCOAL BKG: 150 cpm Wt. Out: 180.0 g.
FIELD TECHNICIANS: CE.DLC, CS, TE COUNTED BY: DLC DATA ENTRY BY: DLC TARE WEIGHT: 29 2 g
COUNTING SYSTEM I.D.: M01/D21, M02/D20 CAL. DUE: 6/27/15
RECOUNT CANISTER ANALYSIS:
CLIENT: ENERGY FUELS RESOURCES PROJECT: RADON FLUX MEASUREMENTS, WHITE MESA MILL PROJECT NO.: 15004.01
GRID SAMPLE RETRIV ANALYSIS MID-TIME CNT GROSS GROSS RADON + LLD PRECISION
LOCATION I. D. HR MIN HR MIN MO DA YR HR MIN (MIN) COUNTS WT IN pCi/m2s pCi/m2 s pCi/rn2s % RPD
BIO BIO 10 33 10 30 1 30 15 15 53 1 79123 218.7 167.5 16.8 0.04
RECOUNT B10 10 33 10 30 1 31 15 7 18 1 71664 218.7 170.5 17.1 0.04 ' 1.8%
B20 B20 10 33 10 30 1 30 15 16 0 1 47950 223.3 101.5 10.2 0.04
RECOUNT B20 10 33 10 30 1 31 15 7 18 1 43495 223.3 103.3 10.3 0.04 1.8%
B30 B30 10 33 10 30 1 30 15 16 8 1 26579 224.9 56.2 5.6 0.04
RECOUNT B30 10 33 10 30 1 31 15 7 20 1 22668 224.9 53.7 5.4 0.04 4.5%
B4 0 B40 10 55 10 44 1 30 15 16 15 1 2244 218.5 4.5 0.5 0.04
RECOUNT B40 10 55 10 44 1 31 15 7 20 1 2016 218.5 4.5 0.5 0.04 0.0%
B50 B50 10 55 10 44 1 30 15 16 23 1 16994 222.4 36.0 3.6 0.04
RECOUNT B50 10 55 10 44 1 31 15 7 21 1 15436 222.4 36.6 3.7 0.04 1.7%
B60 B60 11 1 10 58 1 30 15 16 30 1 20672 215.5 43.6 4.4 0.04
RECOUNT B60 11 1 10 58 1 31 15 7 21 1 18840 215.5 44.4 4.4 0.04 1.8%
B70 B70 11 8 11 3 1 30 15 16 38 1 6710 219.1 14.0 1.4 0.04
RECOUNT B70 11 8 11 3 1 31 15 7 23 1 6130 219.1 14.2 1.4 0.04 ' 1.4%
B80 B80 11 8 11 2 1 30 15 16 45 1 3637 221.5 7.4 0.7 0.04
RECOUNT B80 11 8 11 2 1 31 15 7 23 1 3343 221.5 7.6 0.8 0.04 2.7%
B90 B90 11 28 11 9 1 30 15 16 53 1 162078 218.2 348.0 34.8 0.04
RECOUNT B90 11 28 11 9 1 31 15 7 24 1 147874 218.2 354.2 35.4 0.04 1.8%
B10° B100 11 36 11 12 1 30 15 17 0 1 37872 218.0 81.4 8.1 0.04
RECOUNT B100 11 36 11 12 1 31 15 7 24 1 34885 218.083.68.4 0,042.7%
_AVERAGE PERCENT PRECISION FOR THE CELL 3 BEACH REGION: 2.0%
Page 1 of 1
PILE: 3 BATCH: C SURFACE: SOIL AIR TEMP MIN: 34°F WEATHER: CLEAR, NO RAIN
AREA: COVER DEPLOYED: 1 28 15 RETRIEVED: 1 29 15 CHARCOAL BKG: 147 cpm Wt. Out: 180.0 g.
FIELD TECHNICIANS: CE,DLC, CS, TE COUNTED BY: DLC DATA ENTRY BY: DLC TARE WEIGHT' 29 2 g
COUNTING SYSTEM I.D.: M01/D21, M02/D20 CAL. DUE: 6/27/15
RECOUNT CANISTER ANALYSIS:
CLIENT: ENERGY FUELS RESOURCES PROJECT: RADON FLUX MEASUREMENTS, WHITE MESA MILL PROJECT NO.: 15004.01
GRID SAMPLE RETRIV ANALYSIS MID-TIME CNT GROSS GROSS RADON ± LLD PRECISION
LOCATION I. D. HR MIN HR MIN MO DA YR HR MIN (MIN) COUNTS WT IN pCi/m2 s pCi/m2s pCi/m2 s % RPD
CIO CIO 11 55 12 1 1 31 15 7 28 1 3448 225.1 6.5 0.7 0.04
RECOUNT CIO 11 55 12 1 2 1 15 10 38 1 2859 225.1 6.5 0.7 0.04 0.0%
C20 C2 0 12 11 12 9 1 31 15 7 39 1 1842 222.2 3.3 0.3 0.04
RECOUNT C20 12 11 12 9 2 1 15 10 38 1 1523 222.2 3.3 0.3 0.04 0.0%
C30 C30 12 35 12 26 1 31 15 7 52 1 3496 220.4 6.6 0.7 0.04
RECOUNT C30 12 35 12 26 2 1 15 10 39 1 2914 220.4 6.7 0.7 0.04 1.5%
C40 C40 12 40 12 33 1 31 15 8 3 1 1608 220.8 2.9 0.3 0.04
RECOUNT C40 12 40 12 33 2 1 15 10 39 1 1294 220.8 2.8 0.3 0.04 3.5%
C50 C50 11 48 11 56 1 31 15 8 12 1 1783 216.9 3.2 0.3 0.04
RECOUNT C50 11 48 11 56 2 1 15 10 41 1 1480 216.9 3.2 0.3 0.04 0.0%
C60 C60 11 45 11 55 1 31 15 8 21 2 1602 215.9 1.3 0.1 0.04
RECOUNT C60 11 45 11 55 2 1 15 10 42 2 1328 215.9 1.2 0.1 0.04 8.0%
C70 C70 12 15 12 5 1 31 15 8 31 1 13610 222.6 26.8 2.7 0.04
RECOUNT C70 12 15 12 5 2 1 15 10 44 1 11375 222.6 27.3 2.7 0.04 1.8%
C80 C80 12 35 12 26 1 31 15 8 39 2 1117 217.1 0.8 0.1 0.04
RECOUNT C80 12 35 12 26 2 1 15 10 46 3 1294 217.1 0.7 0.1 0.04 13.3%
C90 C90 12 35 12 28 1 31 15 8 49 1 1092 219.9 1.9 0.2 0.04
RECOUNT C90 12 35 12 28 2 1 15 10 50 2 1874 219.9 1.9 0.2 0.04 0.0%
C100 12 45 12 41 1 31 15 8 59 1 1112 230.2 1.9 0.2 0.04
C100 12 45 12 41 2 1 15 10 50 2 1854 230.2_______1.9_______ 0.2 0.04__________Q. Q%
_____________________________________________AVERAGE PERCENT PRECISION FOR THE CELL 3 COVER REGION: 2.8%
C100
RECOUNT
Appendix C
Radon Flux Sample Laboratory Data (including Blanks)
c
CLIENT: ENERGY FUELS RESOURCES PROJECT: RADON FLUX MEASUREMENTS, WHITE MESA MILL PROJECT NO.: 15004.01
P|LE:3 BATCH: B SURFACE: TAILINGS AIR TEMP MIN'30°F
AREA: BEACH DEPLOYED: 1 27 15 RETRIEVED: 1 28 15 CHARCOAL BKG'
FIELD TECHNICIANS: CE,DLC, CS, TE COUNTED BY: DLC DATA ENTRY BY- DLC
COUNTING SYSTEM I.D.: M01/D21, M02/D20 CAL. DUE: 6/27/15
WEATHER: CLEAR, NO RAIN
150 cpm Wt. Out: 180.0 g.
TARE WEIGHT: 29.2 q.
GRID
LOCATION
BOl
B02
B03
B04
B05
B06
B07
B08
B09
BIO
Bll
B12
B13
B14
B15
B16
B17
B18
B19
B20
B21
B22
B23
B24
B25
B26
B27
B28
B29
B30
B31
B32
B33
B34
B35
B36
B37
SAMPLE
I. D.
BOl
B02
B03
B04
B05
B06
B07
B08
B09
BIO
Bll
B12
B13
B14
B15
B16
B17
B18
B19
B20
B21
B22
B23
B24
B25
B26
B27
B2 8
B29
B30
B31
B32
B33
B34
B35
B3 6
B37
DEPLOY RETRIV ANALYSIS MID-TIME CNT GROSS GROSS RADON + LLD
HR MIN HR MIN MO DA YR HR MIN (MIN) COUNTS WT IN pCi/m2 s pCi/m2s pCi/m2s COMMENTS:
10
10
10
10
10
10
10
10
10
10
10
10
10
15
17
19
21
10 23
10 25
10
10
10
10
10
10
10
10
10
10
10
27
29
31
33
15
17
19
21
23
25
27
10 29
10 31
33
15
17
19
21
10 23
10 25
10 27
10 29
31
33
37
39
10 41
10 43
10 45
10 47
10
10
10
10
10
10
10
10
10
10
10
10
10
10
10
10
10
10
10
10
10
10
10
10
10
10
10
10
10
10
10
10
10
10
39
38
37
36
35
34
33
32
31
30
30
38
37
36
35
34
33
32
31
30
39
38
37
36
35
34
33
32
31
30
53
52
51
50
10 49
10 48
10 49 10 47
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
30
30
30
30
30
30
30
30
30
30
30
30
30
30
30
30
30
30
30
30
30
30
30
30
30
30
30
30
30
30
30
30
30
30
30
30
30
15 15
15 15
15 15
15 15
15 15
15 15
15 15
15 15
15 15
15 15
15 15
15 15
15 15
15 15
15 15
15 15
15 15
15 15
15 16
15 16
15 16
15 16
15 16
15 16
15
15
15 16
15 16
15 16
15 16
15
15
15
16
16
16
16
16
15 16
15 16
15 16
15 16
47
47
48
48
50
50
51
51
53
53
54
54
56
56
57
57
59
59
0
0
2
2
3
3
5
5
6
6
8
8
9
9
11
11
12
12
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
16871
11390
3368
18083
9063
12631
78800
19272
39718
79123
13490
11936
24714
26454
21998
17547
29075
7690
5958
47950
22754
21056
4491
30380
14229
19581
7791
8939
26328
26579
23541
10336
11998
18204
13032
26571
35253
.4
. 1
.0
.7
.2
.7
217.8
216.9
216.0
219.4
216.3
222.8
216 .
220
219
218 .
219 ,
218
218.6
217.0
215.5
215.8
217.8
219.6
224.0
223.3
218.3
217.8
214.8
217.6
219.3
228.6
218.5
217.5
218.8
224.9
219.0
215.8
216.6
218.9
219.0
219.2
226.4
34.9
23.4
6.7
37.6
18.8
26.3
166.3
40.4
84
167,
28 ,
24
51
55,
46
36
61.2
15.9
12
101 ,
47 ,
43
9.1
63.4
29.7
41.0
16.2
18.6
55.7
56.2
.0
.5
. 1
. 6
.6
.2
.0
.6
.3
. 5
.3
.7
49
21
25
38
27
55
74
3 ,
2 ,
0 .
3 .
1.
2 .
16.
4 .
8.4
16.8
2
2
5
5
4
3
6
1,
1
10,
4 ,
4 ,
0 .
6 .
3 .
4 .
1.
1.9
5.6
0.04
0.04
0.04
0.04
0.04
0.04
0.04
0.04
0.04
0.04
0.04
0.04
0.04
0.04
0.04
0.04
0.04
0.04
0.04
0.04
0.04
0.04
0.04
0.04
04
04
04
0.04
0.04
04
04
0.04
0.04
0.04
0.04
0.04
0.04
Page 1 of 3
CLIENT: ENERGY FUELS RESOURCES PROJECT: RADON FLUX MEASUREMENTS, WHITE MESA MILL PROJECT NO.: 15004.01
PILE: 3 BATCH: B SURFACE: TAILINGS AIR TEMP MIN: 30°F WEATHER: CLEAR, NO RAIN
AREA: BEACH DEPLOYED: 1 27 15 RETRIEVED: 1 28 15 CHARCOAL BKG: 150 cpm Wt. Out: 180.0 g.
FIELD TECHNICIANS: CE,DLC, CS, TE COUNTED BY: DLC DATA ENTRY BY: DLC TARE WEIGHT: 29.2 g.
COUNTING SYSTEM I.D.: M01/D21, M02/D20 CAL. DUE: 6/27/15
GRID SAMPLE DEPLOY RETRIV ANALYSIS MID-TIME CNT GROSS GROSS RADON ± LLD
LOCATION______I. D. HR MIN HR MIN MO DA YR HR MIN (MIN) COUNTS WT IN pCi/m2s pCi/m2s pCi/m2 s COMMENTS:
B3 8 B38 10 51 10 46 1 30 15 16 14 1 22732 219.7 48.0 4.8 0.04
B3 9 B39 10 53 10 45 1 30 15 16 15 1 26578 218.7 56.5 5.6 0.04
B40 B40 10 55 10 44 1 30 15 16 15 1 2244 218.5 4.5 0.4 0.04
B41 B41 10 37 10 53 1 30 15 16 17 1 16377 215.6 34.1 3.4 0.04
B42 B42 10 39 10 52 1 30 15 16 17 1 46171 219.1 96.7 9.7 0.04
B43 B43 10 41 10 51 1 30 15 16 18 1 12090 217.1 25.2 2.5 0.04
B44 B44 10 43 10 50 1 30 15 16 18 1 13902 219.8 29.0 2.9 0.04
B45 B45 10 45 10 49 1 30 15 16 20 1 26108 216.2 55.0 5.5 0.04
B46 B46 10 47 10 48 1 30 15 16 20 1 19070 219.8 40.1 4.0 0.04
B47 B47 10 49 10 47 1 30 15 16 21 1 14018 218.5 29.5 3.0 0.04
B48 B48 10 51 10 46 1 30 15 16 21 1 15698 215.3 33.1 3.3 0.04
B49 B4 9 10 53 10 45 1 30 15 16 23 1 34501 218.6 73.5 7.3 0.04
B50 B50 10 55 10 44 1 30 15 16 23 1 16994 222.4 36.0 3.6 0.04
B51 B51 10 37 10 48 1 30 15 16 24 1 28611 219.0 60.1 6.0 0.04
B52 B52 10 39 10 47 1 30 15 16 24 1 33141 217.7 69.6_______7.0 0.04
B53 B53 10 41 10 46 1 30 15 16 26 1 55934 218.9 118.3 11.8 0.04
B54 B54 10 43 10 45 1 30 15 16 26 1 41670 227.6 88.0 8.8 0.04
B55 B55 10 45 10 44 1 30 15 16 27 1 13383 217.4 28.2 2.8 0.04
B56 B56 10 53 11 2 1 30 15 16 27 1 30509 225.2 63.9 6.4 0.04
B57 B57 10 55 11 1 1 30 15 16 29 1 11764 216.8 24.6 2.5 0.04
B58 B58 10 57 11 0 1 30 15 16 29 1 18612 218.3 39.0 3.9 0.04
B59 B59 10 59 10 59 1 30 15 16 30 1 16184 220.7 34.1 3.4 0.04
B60 B60 11 1 10 58 1 30 15 16 30 1 20672 215.5 43.6 4.4 0.04
B61 B61 11 3 10 57 1 30 15 16 32 1 54303 220.2 115.6 11.6 0.04
B62 B62 11 5 10 56 1 30 15 16 32 1 113428 215.6 241.6 24.2 0.04
B63 B63 11 7 10 55 1 30 15 16 33 1 87573 218.2 187.4 18.7 0.04
B64 B64 11 9 10 54 1 30 15 16 33 1 71838 218.8 153.6 15.4 0.04
B65 B65 11 11 10 53 1 30 15 16 35 1 42319 218.0 90.8 9.1 0.04
B66 B66 11 0 11 7 1 30 15 16 35 1 5435 215.5 11.1 1.1 0.04
B67 B67 11 2 11 6 1 30 15 16 36 1 9928 219.2 20.7 2.1 0.04
B68 B68 11 4 11 5 1 30 15 16 36 1 9487 218.3 19.8 2.0 0.04
B69 B69 11 6 11 4 1 30 15 16 38 1 13844 217.4 29.2 2.9 0.04
B70 B70 11 8 11 3 1 30 15 16 38 1 6710 219.1 14.0 1.4 0.04
B71 B71 11 10 11 2 1 30 15 16 39 1 15514 218.4 32.9 3.3 0.04
B72 B72 11 12 11 1 1 30 15 16 39 1 81131 218.3 173.0 17.3 0.04
B73 B73 11 14 11 0 1 30 15 16 41 1 74280 219.6 159.2 15.9 0.04
B74 B74 11 16 10 59 1 30 15 16 41 1 64777 216.8 138.7 13.9 0.04
CLIENT: ENERGY FUELS RESOURCES PROJECT: RADON FLUX MEASUREMENTS, WHITE MESA MILL PROJECT NO.: 15004.01
PILE: 3 BATCH: B SURFACE: TAILINGS AIR TEMP MIN: 30°F WEATHER: CLEAR, NO RAIN
AREA: BEACH DEPLOYED: 1 27 15 RETRIEVED: 1 28 15 CHARCOAL BKG: 150 cpm Wt. Out: 180.0 g.
FIELD TECHNICIANS: CE.DLC, CS, TE COUNTED BY: DLC DATA ENTRY BY: DLC TARE WEIGHT: 29.2 g.
COUNTING SYSTEM I.D.: M01/D21, M02/D20 CAL. DUE: 6/27/15
GRID SAMPLE DEPLOY RETRIV ANALYSIS MID-TIME CNT GROSS GROSS RADON ± LLD
LOCATION I. D. HR MIN HR MIN MO DA YR HR MIN (MIN) COUNTS WT IN pCi/m2s pCi/m2s pCi/m2s COMMENTS:
B75 B75 11 18 10 58 1 30 15 16 42 1 82994 216.1 178.7 17.9 0.04
B76 B76 11 0 11 6 1 30 15 16 42 1 5268 221.3 10.8 1.1 0.04
B77 B77 11 2 11 5 1 30 15 16 44 1 7023 216.3 14.6 1.5 0.04
B78 B78 11 4 11 4 1 30 15 16 44 1 1880 221.9 3.7 0.4 0.04
B79 B79 11 6 11 3 1 30 15 16 45 1 36187 219.5 76.9 7.7 0.04
B80 B80 11 8 11 2 1 30 15 16 45 1 3637 221.5 7.4 0.7 0.04
B81 B81 11 10 11 1 1 30 15 16 47 1 47654 221.6 101.8 10.2 0.04
B82 B82 11 12 11 0 1 30 15 16 47 1 138361 222.0 295.8 29.6 0.04
B83 B83 11 14 10 59 1 30 15 16 48 1 25474 220.4 54.5 5.4 0.04
B84 B84 11 16 10 58 1 30 15 16 48 1 62272 221.3 133.5 13.4 0.04
B85 B85 11 16 11 14 1 30 15 16 50 1 14889 220.0 31.4 3.1 0.04
B86 B86 11 18 11 13 1 30 15 16 50 1 17181 217.3 36.2 3.6 0.04
B87 B87 11 22 11 12 1 30 15 16 51 1 12111 222.0 25.6 2.6 0.04
B88 B88 11 24 11 11 1 30 15 16 51 1 1955 223.0 3.9 0.4 0.04
B89 B89 11 26 11 10 1 30 15 16 53 1 9964 220.9 21.1 2.1 0.04
B90 B90 11 28 11 9 1 30 15 16 53 1 162078 218.2 348.0 34.8 0.04
B91 B91 11 30 11 8 1 30 15 16 54 1 74348 216.6 160.3 16.0 0.04
B92 B92 11 32 11 7 1 30 15 16 54 1 114181 217.1 246.1 24.6 0.04
B93 B93 11 22 11 19 1 30 15 16 56 1 29290 216.0 62.1 6.2 0.04
B94 B94 11 24 11 18 1 30 15 16 56 1 34274 216.5 72.7 7.3 0.04
B95 B95 11 26 11 17 1 30 15 16 57 1 15568 221.1 33.0 3.3 0.04
B96 B96 11 28 11 16 1 30 15 16 57 1 4008 217.5 8.3 0.8 0.04
B97 B97 11 30 11 15 1 30 15 16 59 1 23898 219.0 51.0 5.1 0-.04
B98 B98 11 32 11 14 1 30 15 16 59 1 21431 220.8 45.7 4.6 0.04
B99 B99 11 34 11 13 1 30 15 17 0 1 10063 219.4 21.4 2.1 0.04
B100_________B100 11 36 11 12 1 30 15 17 0______1 37872 218.0 81.4________8.1 0.04
AVERAGE RADON FLUX RATE FOR THE CELL 3 BEACH REGION:______63.5 pCi/m2s________
3.7 MIN..............
BLANK CANISTER ANALYSIS: 348.0 MAX
GRID SAMPLE RETRIV ANALYSIS MID-TIME CNT GROSS GROSS RADON ± LLD
LOCATION I. D. HR MIN HR MIN MO DA YR HR MIN (MIN) COUNTS WT IN pCi/in2s pCi/m2s pCi/m2 s COMMENTS:
B BLANK 1 B BLANK 1 10 0 10 30 1 30 15 14 40 10 2005 207.4 0.10 0.03 0.04 CONTROL
B BLANK 2 B BLANK 2 10 0 10 30 1 30 15 14 40 10 1716 208.0 0.04 0.03 0.04 CONTROL
B BLANK 3 B BLANK 3 10 0 10 30 1 30 15 14 51 10 1742 208.7 0.05 0.03 0.04 CONTROL
B BLANK 4 B BLANK 4 10 0 10 30 1 30 15 14 51 10 1542 206.2 0.01 0.03 0.04 CONTROL
B BLANK 5 B BLANK 5 10 0 10 30 1 30 15 15 2 10 1572 208.1 0.01 0.030.04 CONTROL
_____________________ AVERAGE BLANK CANISTER ANALYSIS FOR THE CELL 3 BEACH REGION: 0.04 pCi/m2s
Page 3 of 3
CLIENT: ENERGY FUELS RESOURCES PROJECT: RADON FLUX MEASUREMENTS, WHITE MESA MILL
PILE: 3 BATCH: C SURFACE: SOIL AIR TEMP MIN: 34°F
AREA: COVER DEPLOYED: 1 28 15 RETRIEVED: 1 29 15 CHARCOAL BKG:
FIELD TECHNICIANS: CE.DLC, CS, TE COUNTED BY: DLC DATA ENTRY BY: DLC
COUNTING SYSTEM I.D.: M01/D21, M02/D20 CAL. DUE: 6/27/15
GRID SAMPLE DEPLOY RETRIV ANALYSIS MID-TIME CNT GROSS
LOCATION I. D. HR MIN HR MIN MO DA YR HR MIN (MIN) COUNTS
C01 C01 11 45 11 55 1 31 15 7 20 1 1113
C02 C02 11 46 11 55 1 31 15 7 20 1 4100
C03 C03 11 47 11 56 1 31 15 7 21 1 2863
C04 C04 11 48 11 57 1 31 15 7 21 1 3892
C05 C05 11 49 11 58 1 31 15 7 23 2 1122
C06 C06 11 50 11 58 1 31 15 7 23 2 1181
CO 7 CO 7 11 51 11 59 1 31 15 7 26 2 1003
C08 C08 11 52 12 0 1 31 15 7 26 2 1878
C09 C09 11 54 12 1 1 31 15 7 29 3 1104
CIO CIO 11 55 12 1 1 31 15 7 28 1 3448
Cll Cll 11 57 12 2 1 31 15 7 32 1 1400
C12 C12 11 59 12 3 1 31 15 7 32 1 1339
C13 C13 12 0 12 4 1 31 15 7 33 1 2020
C14 C14 12 1 12 4 1 31 15 7 33 1 2977
C15 C15 12 3 12 5 1 31 15 7 35 1 1911
C16 C16 12 5 12 6 1 31 15 7 36 2 1307
C17 C17 12 6 12 7 1 31 15 7 37 1 1998
C18 C18 12 8 12 7 1 31 15 7 37 1 4336
C19 C19 12 9 12 8 1 31 15 7 39 1 1175
C20 C20 12 11 12 9 1 31 15 7 39 1 1842
C21 C21 12 12 12 10 1 31 15 7 40 1 2086
C22 C22 12 23 12 10 1 31 15 7 41 2 1001
C23 C23 12 24 12 11 1 31 15 7 44 3 1198
C24 C24 12 26 12 12 1 31 15 7 44 2 1221
C25 C25 12 27 12 13 1 31 15 7 47 2 1154
C26 C26 12 28 12 13 1 31 15 7 46 1 2109
C27 C27 12 30 12 14 1 31 15 7 50 2 1004
C28 C28 12 33 12 15 1 31 15 7 49 1 3994
C29 C29 12 34 12 25 1 31 15 7 52 1 1884
C30 C3 0 12 35 12 26 1 31 15 7 52 1 3496
C31 C31 12 35 12 27 1 31 15 7 53 1 2176
C32 C32 12 36 12 27 1 31 15 7 53 1 4724
C33 C33 12 36 12 28 1 31 15 7 55 1 5450
C34 C34 12 37 12 29 1 31 15 7 56 2 1578
C35 C35 12 37 12 30 1 31 15 7 58 2 1653
C3 6 C36 12 38 12 30 1 31 15 7 58 1 1063
C37 C37 12 38 12 31 1 31 15 8 1 2 1104
Page 1 of 3
PROJECT NO.: 15004.01
WEATHER: CLEAR, NO RAIN
147 cpm Wt. Out: 180.0 g.
TARE WEIGHT: 29.2 g.
GROSS RADON + LLD
WT IN pCi/m2s pCi/m;s pCi/m2s COMMENTS^
221.7 1.9 0.2 0.04
220.2 7.7 0.8 0.04
218.4 5.3 0.5 0.04
219.8 7.3 0.7 0.04
218.8 0.8 0.1 0.04
223.8 0.9 0.1 0.04
219.3 0.7 0.1 0.04
221.1 1.5 0.2 0.04
220.4 0.4 0.0 0.04
225.1 6.5 0.6 0.04
221.6 2.5 0.2 0.04
220.0 2.3 0.2 0.04
220.7 3.7 0.4 0.04
225.1 5.5 0.6 0.04
219.8 3.5 0.3 0.04
221.5 1.0 0.1 0.04
222.6 3.6 0.4 0.04
223.0 8.2 0.8 0.04
219.7 2.0 0.2 0.04
222.2 3.3 0.3 0.04
221.0 3.8 0.4 0.04
221.8 0.7 0.1 0.04
222.5 0.5 0.1 0.04
221.6 0.9 0.1 0.04
221.7 0.9 0.1 0.04
220.6 3.9 0.4 0.04
221.3 0.7 0.1 0.04
223.6 7.7 0.8 0.04
221.2 3.4 0.3 0.04
220.4 6.6 0.7 0.04
224.1 4.0 0.4 0.04
222.5 9.0 0.9 0.04
220.6 10.5 1.1 0.04
226.4 1.3 0.1 0.04
221.6 1-3 0.1 0.04
219.8 1.8 0.2 0.04
220.7 0.8 0.1 0.04
CLIENT: ENERGY FUELS RESOURCES PROJECT: RADON FLUX MEASUREMENTS, WHITE MESA MILL PROJECT NO.: 15004.01
PILE: 3 BATCH: C SURFACE: SOIL AIR TEMP MIN: 34°F WEATHER: CLEAR, NO RAIN
AREA: COVER DEPLOYED: 1 28 15 RETRIEVED: 1 29 15 CHARCOAL BKG: 147 cpm Wt. Out: 180.0 g.
FIELD TECHNICIANS: CE,DLC, CS, TE COUNTED BY: DLC DATA ENTRY BY: DLC TARE WEIGHT: 29.2 g.
COUNTING SYSTEM I.D.: M01/D21, M02/D20 CAL. DUE: 6/27/15
GRID SAMPLE DEPLOY RETRIV ANALYSIS MID-TIME CNT GROSS GROSS RADON + LLD
LOCATION I. D. HR MIN HR MIN MO DA YR HR MIN (MIN) COUNTS WT IN pCi/m2s pCi/m2 s pCi/m2 s COMMENTS:
C38 C38 12 39 12 32 1 31 15 8 1 1 34138 221.8 67.1 6.7 0.04
C39 C39 12 39 12 33 1 31 15 8 3 1 4807 221.7 9.2 0.9 0.04
C40 C40 12 40 12 33 1 31 15 8 3 1 1603 220.8 2.9 0.3 0.04
C41 C41 12 40 12 34 1 31 15 8 4 1 1142 224.2 2.0 0.2 0.04
C42 C42 12 41 12 35 1 31 15 8 4 1 1003 222.4 1.7 0.2 0.04
C43 C43 12 41 12 36 1 31 15 8 6 2 1292 222.7 1.0 0.1 0.04
C44 C44 12 42 12 36 1 31 15 8 6 1 1513 221.2 2.7 0.3 0.04
C45 C45 12 42 12 37 1 31 15 8 8 1 20562 221.7 40.4 4.0 0.04
C46 C46 12 43 12 38 1 31 15 8 8 1 11465 217.8 22.3 2.2 0.04
C47 C47 12 43 12 39 1 31 15 8 9 1 14730 222.1 28.8 2.9 0.04
C48 C48 12 44 12 39 1 31 15 8 10 2 1351 222.7 1.0 0.1 0.04
C49 C49 11 45 11 55 1 31 15 8 12 1 1250 219.8 2.2 0.2 0.04
C50 C50 11 48 11 56 1 31 15 8 12 1 1783 216.9 3.2 0.3 0.04
C51 C51 11 51 11 57 1 31 15 8 14 1 17223 221.3 33.7 3.4 0.04
C52 C52 11 54 11 58 1 31 15 8 14 1 6979 222.8 13.5 1.3 0.04
C53 C53 11 57 11 59 1 31 15 8 15 1 10420 221.1 20.3 2.0 0.04
C54 C54 12 0 12 0 1 31 15 8 15 1 1538 222.5 2.7 0.3 0.04
C55 C55 12 3 12 1 1 31 15 8 17 1 1165 221.8 2.0 0.2 0.04
C56 C56 12 6 12 2 1 31 15 8 17 1 15970 221.2 31.3 3.1 0.04
C57 C57 12 9 12 3 1 31 15 8 18 1 1319 218.1 2.3 0.2 0.04
C58 C58 12 12 12 4 1 31 15 8 18 1 4477 219.6 8.6 0.9 0.04
C59 C59 12 15 12 5 1 31 15 8 21 2 1751 220.1 1.5 0.1 0.04
C60 C60 11 45 11 55 1 31 15 8 21 2 1602 215.9 1.3 0.1 0.04
C61 C61 11 48 11 56 1 31 15 8 23 2 1195 218.7 0.9 0.1 0.04
C62 C62 11 51 11 57 1 31 15 8 23 1 8090 220.5 15.7 1.6 0.04
C63 C63 11 54 11 58 1 31 15 8 26 2 1604 223.1 1.3 0.1 0.04
C64 C64 11 57 11 59 1 31 15 8 26 2 1009 221.4 0.7 0.1 0.04
C65 C65 12 0 12 0 1 31 15 8 28 1 4449 222.1 8.5 0.9 0.04
C66 C66 12 3 12 1 1 31 15 8 28 1 1555 217.2 2.8 0.3 0.04
C67 C67 12 6 12 2 1 31 15 8 29 1 28276 221.1 56.0 5.6 0.04
C68 C68 12 9 12 3 1 31 15 8 29 1 3548 219.9 6.8 0.7 0.04
C69 C69 12 12 12 4 1 31 15 8 31 1 11027 215.5 21.7 2.2 0.04
C70 C70 12 15 12 5 1 31 15 8 31 1 13610 222.6 26.8 2.7 0.04
C71 C71 12 17 12 8 1 31 15 8 32 1 4421 215.8 8.5 0.9 0.04
C72 C72 12 19 12 10 1 31 15 8 32 1 6096 221.7 11.8 1.2 0.04
C73 C73 12 21 12 12 1 31 15 8 34 1 2921 219.6 5.5 0.6 0.04
C74 C74 12 23 12 14 1 31 15 8 34 1 3809 216.2 7.3 0.7 0.04
Page 2 of 3
CLIENT: ENERGY FUELS RESOURCES PROJECT: RADON FLUX MEASUREMENTS, WHITE MESA MILL PROJECT NO.: 15004.01
PILE: 3 BATCH: C SURFACE: SOIL AIR TEMP MIN: 34°F WEATHER: CLEAR, NO RAIN
AREA: COVER DEPLOYED: 1 28 15 RETRIEVED: 1 29 15 CHARCOAL BKG: 147 cpm Wt. Out: 180.0 g.
FIELD TECHNICIANS: CE,DLC, CS, TE COUNTED BY: DLC DATA ENTRY BY: DLC TARE WEIGHT: 29.2 g.
COUNTING SYSTEM I.D.: M01/D21, M02/D20 CAL. DUE: 6/27/15
GRID
LOCATION
C75
C76
C77
C78
C79
C80
SAMPLE DEPLOY RETRIV ANALYSIS MID-TIME CNT GROSS GROSS RADON + LLD
I. D. HR MIN HR MIN MO DA YR HR MIN (MIN) COUNTS WT IN pCi/m2 S pCi/m2 S pCi/m2 S COMMENTS:
C81
C82
C83
C84
C85
C86
C87
C88
C89
C90
C91
C92
C93
C94
C95
C96
C97
C98
C99
ClOO
CIS
Cl 6
C77
C78
C79
C80
C81
C82
C83
C84
C85
C86
C87
C88
C89
C90
C91
C92
C93
C94
C95
C96
C97
C98
C99
ClOO
12
12
25
27
12 29
12 31
12
12
12
33
35
17
12 19
12 21
12 23
12 25
12 27
12 29
12
12
31
33
12 35
12 37
12 39
12 41
12 43
12 37
12 39
12 41
12 43
12 45
12 45
12
12
12
12
12
12
12
12
12
12
12
12
12
12
12
12
12
12
12
12
12
12
12
12
12
12
16
18
20
22
24
26
19
20
21
22
23
24
25
26
27
28
29
30
32
34
36
38
40
42
44
41
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
31 15
31 15
31 15
31 15
31 15
31 15
31 15
31 15
31 15
31 15
31 15
31 15
31 15
31 15
31 15
31 15
31 15
31 15
31 15
31 15
31 15
31 15
31 15
31 15
31 15
31 15
8
8
8
8
8
8
8
8
8
8
8
8
8
8
8
8
8
8
8
8
8
8
8
8
8
8
35
35
37
37
39
39
41
41
43
43
45
45
47
47
49
49
51
51
53
54
56
56
58
58
59
59
1
1
1
1
2
2
2
1
1
1
2
1
1
1
2
1
2
1
1
2
1
1
1
1
1
1
2422
3925
2752
32249
1402
1117
1443
34131
7876
19943
1008
1782
9925
54367
1476
1092
1414
2767
1518
1492
1511
2142
13537
10706
2171
1112
220.4
219.2
214.7
223.6
219.9
217.1
218.1
218.9
222.0
219 .
223 ,
220 .
221.
218.8
218.0
219.9
220.6
219.4
218.0
221.0
219.5
214.1
218.0
215.0
218.7
230.2
.3
.1
.4
. 9
4.5
7.5
5.2
63.8
1.1
0.8
1 .
67 .
15 ,
39,
0.
3 ,
19.
107.6
1.2
1.9
1.1
.1
.2
.3
.2
. 7
.2
.4
0.5
0.8
0.5
6.4
0.1
0.1
0.1
0.04
0.04
0.04
0.04
0.04
0.04
0.04
0.04
0.04
0.04
0.04
10.8
0.1
5.2
2.7
1
2
3
26.
20
4.0
1.9
04
04
04
04
04
0.04
0.04
0.04
0.04
0.04
0.04
0.04
0.04
0.04
0.04
AVERAGE RADON FLUX RATE FOR THE CELL 3 COVER REGION:10.1 pCi/m2 s
BLANK CANISTER ANALYSIS:
0.4
107.6 MAX
LOCATION
C BLANK 1
C BLANK 2
C BLANK 3
C BLANK 4
C BLANK 5
SAMPLE RETRIV ANALYSIS MID-TIME CNT GROSS GROSS RADON + LLD
I. D. HR MIN HR MIN MO DA YR HR MIN (MIN) COUNTS WT IN pCi/m2 s pCi/m2 s pCi/m2 s COMMENTS:
C BLANK 1 11 30 12 0 1 30 15 15 13 10 1807 214.5 0.06 0.02 0.03 CONTROL
C BLANK 2 11 30 12 0 1 30 15 15 13 10 1804 211.7 0.06 0.02 0.03 CONTROL
C BLANK 3 11 30 12 0 1 30 15 15 24 10 1692 211.6 0.04 0.02 0.03 CONTROL
C BLANK 4 11 30 12 0 1 30 15 15 24 10 1774 205.4 0.05 0.02 0.03 CONTROL
C BLANK 5 11 30 12 0 1 30 15 15 35 10 1614 212.0 0.02 0.02 0.03 CONTROL
AVERAGE BLANK CANISTER ANALYSIS FOR THE CELL 3 COVER REGION:0.05 pCi/m2 s
Appendix D
Sample Locations Map (Figure 2)
D
c czj
n
CELL!
AS♦ —fM
¥
dI
CELL 2
C01
C14
CIS
C02 C28
C2903
C42C16
C03 C43C27 b*ACHC12C30rEGIqnC4107
C26 C44C04C31 C59C40Cl 8 C58C25C45°0lJNnc°VBrf C57C05C32'A^B£Td*egioC10 C56weenC39C19 C55C0*EfVBC70C24 C46 each C54C69C06C33 C53C68C09&C38
C07 C52C67C47C08C23 C51C66C71C21C34 C50C65C72C37C22CELL C49C64C73C35C48DijMPinC63C74C100OC36C62C75C81
C°VERP C61C76C82L,QUlO °REgi0n C60C77C83
C78C84
C79C85C99 C80C86C98
C87C97
C96 C88
C95 C89
C90C94
C93
C92
C91
CELL4B
~CELL 4A
WHITE MESA MILL
BLANDING. UTAH
NESHAPS 2014
CELL 3
JANUARY 2015 SAMPLING
01/27/15-01/29/15
PREPARED FOR
ENERGY FUELS RESOURCES
LEGEND
B01 • ■ SAMPLE LOCATION ON BEACH AREAS
C01 O - SAMPLE LOCATION ON COVERED AREAS
FIGURE 2
IV
I
SCALE IN FEET
200 100 0 200 400
nuco
ENVIRONMENTAL, LLC
THIS DRAWING IS THE PROPERTY OF TELLCO
ENVIRONMENTAL, LLC, AND IS NOTTO BE
REPRODUCED, MODIFIED OR USED FOR ANY
OTHER PROJECT OR EXTENSION OF THIS PROJECT
EXCEPT BY AGREEMENT WITH TELLCO.
ATTACHMENT 2
Tellco Report for Radon Flux Monitoring
May 2015
National Emission Standards for Hazardous Air Pollutants
2015 Radon Flux Measurement Program
White Mesa Mill
6425 South Highway 191
Blanding, Utah 84511
2nd Quarter 2015 Sampling Results
Cell 3
Prepared for: Energy Fuels Resources (USA) Inc.
6425 S. Highway 191
P.O. Box 809
Blanding, Utah 84511
Prepared by: Tellco Environmental
P.O. Box 3987
Grand Junction, Colorado 81502
TABLE OF CONTENTS
Page
1. INTRODUCTION........................................................ 1
2. SITE DESCRIPTION...........................................................................................................................................1
3. REGULATORY REQUIREMENTS FOR THE SITE................................................................................1
4. SAMPLING METHODOLOGY.................................................................................................... 2
5. FIELD OPERATIONS...........................................................................................................................................2
5.1 Equipment Preparation............................................................................................................................2
5.2 Sample Locations, Identification, and Placement.........................................................................3
5.3 Sample Retrieval.....................................................................................................................................3
5.4 Environmental Conditions...................................................................................................................4
6. SAMPLE ANALYSIS...................................................................................................................... 4
6.1 Apparatus...................................................................................................................................................4
6.2 Sample Inspection and Documentation............................................................................................4
6.3 Background and Sample Counting....................................................................................................4
7. QUALITY CONTROL (QC) AND DATA VALIDATION.......................................................................5
7.1 Sensitivity............................................. 5
7.2 Precision......................................................................................................................................................5
7.3 Accuracy.................................................................... 6
7.4 Completeness............................................................................................................................................6
8. CALCULATIONS...................................................................................................................................................6
9. RESULTS...................................................................................................................................................................7
9.1 Mean Radon Flux.....................................................................................................................................7
9.2 Site Results.................................................................................................................................................8
References........................................................................................................................................................................9
Figure 1...........................................................................................................................................................................10
Appendix A. Charcoal Canister Analyses Support Documents
Appendix B. Recount Data Analyses
Appendix C. Radon Flux Sample Laboratory Data, Including Blanks
Appendix D. Sample Locations Map (Figure 2)
1.INTRODUCTION
During May 11-13,2015 Tellco Environmental, LLC (Tellco) of Grand Junction, Colorado, provided
support to Energy Fuels Resources (USA) Inc. (Energy Fuels) to conduct radon flux measurements at
its White Mesa Mill site regarding the required National Emission Standards for Hazardous Air
Pollutants (NESHAPs) Radon Flux Measurements. These measurements are required of Energy Fuels
to show compliance with Federal Regulations (further discussed in Section 3 below). The standard is
not an average per facility, but is an average per radon source. The standard allows mill owners or
operators the option of either making a single set of measurements or making measurements over a
one year period (e.g., weekly, monthly, or quarterly intervals).
Tellco was contracted to provide radon canisters, equipment, and canister placement personnel as well
as lab analysis of samples. Energy Fuels personnel provided support for loading and unloading
charcoal from the canisters. This report details the procedures employed by Energy Fuels and Tellco
to obtain the results presented in Section 9.0 of this report. This report presents the results of the radon
flux measurements for Cell 3 only; no radon flux measurements for Cell 2 were performed during
May 2015.
2. SITE DESCRIPTION
The White Mesa Mill facility is located in San Juan County in southeastern Utah, six miles south of
Blanding, Utah. The mill began operations in 1980 for the purpose of extracting uranium and
vanadium from feed stocks. Processing effluents from the operation are deposited in lined cells,
which vary in depth. Cell 1, Cell 4A, and Cell 4B did not require radon flux sampling, as explained in
Section 3 below.
Cell 2 has a total area of approximately 270,624 square meters (m ) and is comprised of one region
which requires NESHAPs radon flux monitoring. Cell 2 has been filled and covered with interim soil
cover of varying thickness and there are no exposed tailings beaches or standing liquid within Cell 2.
Cell 3 is nearly filled with tailings sand and is undergoing pre-closure activities. This cell has a total
area of 288,858 m2 and is comprised of two source regions that require NESHAPs radon flux
monitoring: approximately 258,262 m2 of interim soil cover of varying thickness and approximately
20,442 m2 of exposed tailings beaches. The remaining approximately 10,154 m2 was covered by
standing liquid in lower elevation areas. The sizes of the Cell 3 regions during the May 2015 radon
flux measurements were approximately the same as they were during January 2015 sampling.
3. REGULATORY REQUIREMENTS FOR THE SITE
Radon emissions from the uranium mill tailings at this site are regulated by the State of Utah’s
Division of Radiation Control and administered by the Utah Division of Air Quality under generally
applicable standards set by the Environmental Protection Agency (EPA) for Operating Mills.
Applicable regulations are specified in 40 CFR Part 61, Subpart W, National Emission Standards for
Radon Emissions from Operating Mill Tailings, with technical procedures in Appendix B. At present,
there are no Subpart T uranium mill tailings at this site. These regulations are a subset of the
NESHAPs. According to subsection 61.252 Standard, (a) radon-222 emissions to ambient air from an
l
existing uranium mill tailings pile shall not exceed an average of 20 pCi/m2-s for each pile, or cell.
Subsection 61.253, Determining Compliance, states that: "Compliance with the emission standard in
this subpart shall be determined annually through the use of Method 115 of Appendix B." The
repaired Cell 4A, and newly constructed Cell 4B, were both constructed after December 15, 1989
and each was constructed with less than 40 acres surface area. Cell 4A and 4B comply with the
requirements of 40 CFR 61.252(b), therefore no radon flux measurements are required on either
Cell 4A or 4B. Cell 1 is completely covered with standing liquid and therefore no radon flux
measurements are required on Cell 1.
4. SAMPLING METHODOLOGY
Radon emissions were measured using Large Area Activated Charcoal Canisters (canisters) in
conformance with 40 CFR, Part 61, Appendix B, Method 115, Restrictions to Radon Flux
Measurements, (EPA, 2014). These are passive gas adsorption sampling devices used to determine
the flux rate of radon-222 gas from a surface. The canisters were constructed using a 10-inch
diameter PVC end cap containing a bed of 180 grams of activated, granular charcoal. The prepared
charcoal was placed in the canisters on a support grid on top of a !4 inch thick layer of foam and
secured with a retaining ring under 114 inches of foam (see Figure 1, page 11).
Two hundred sampling locations were distributed throughout Cell 3 (comprised of two source regions
requiring monitoring) as depicted on the Sample Locations Map (see Figure 2, Appendix D). Each
charged canister was placed directly onto the surface (open face down) and exposed to the surface for
24 hours. Radon gas adsorbed onto the charcoal and the subsequent radioactive decay of the
entrained radon resulted in radioactive lead-214 and bismuth-214. These radon progeny isotopes emit
characteristic gamma photons that can be detected through gamma spectroscopy. The original total
activity of the adsorbed radon was calculated from these gamma ray measurements using calibration
factors derived from cross-calibration of standard sources containing known total activities of
radium-226 with geometry identical to the counted samples and from the principles of radioactive
decay.
After approximately 24 hours, the exposed charcoal was transferred to a sealed plastic sample
container (to prevent radon loss and/or further exposure during transport), identified and labeled, and
transported to the Tellco laboratory in Grand Junction, Colorado for analysis. Upon completion of on­
site activities, the field equipment was alpha and beta-gamma scanned for possible contamination
resulting from fieldwork activities. All field equipment was surveyed by Energy Fuels Radiation
Safety personnel and released for unrestricted use. Tellco personnel maintained custody of the
samples from collection through analysis.
5. FIELD OPERATIONS
5.1 Equipment Preparation
All charcoal was dried at 110°C before use in the field. Unused charcoal and recycled charcoal were
treated the same. 180-gram aliquots of dried charcoal were weighed and placed in sample containers.
Proper balance operation was verified daily by checking a standard weight. The balance readout
agreed with the known standard weight to within ±0.1 percent.
2
After acceptable balance check, empty containers were individually placed on the balance and the
scale was re-zeroed with the container on the balance. Unexposed and dried charcoal was carefully
added to the container until the readout registered 180 grams. The lid was immediately placed on the
container and sealed with plastic tape. The balance was checked for readout drift between readings.
Sealed containers with unexposed charcoal were placed individually in the shielded counting well,
with the bottom of the container centered over the detector, and the background count rate was
documented. Three five-minute background counts were conducted on ten percent of the containers,
selected at random to represent the "batch". If the background counts were too high to achieve an
acceptable lower limit of detection (LLD), the entire charcoal batch was labeled non-conforming and
recycled through the heating/drying process.
5.2 Sample Locations, Identification, and Placement
On May 11, 2015, one hundred sampling locations were distributed throughout the Cell 3 beaches
region; and on May 12, 2015, one hundred sampling locations were distributed throughout the Cell 3
covered regions. A sample identification number (ID) was assigned to every sample point, using a
sequential alphanumeric system indicating the charcoal batch and physical location within the region
(e.g., DO 1...El00). This ID was written on an adhesive label and affixed to the top of the canister.
The sample ID, date, and time of placement were recorded on the radon flux measurements data
sheets for the set of one hundred measurements.
Prior to placing a canister at each sample location, the retaining ring, screen, and foam pad of each
canister were removed to expose the charcoal support grid. A pre-measured charcoal charge was
selected from a batch, opened and distributed evenly across the support grid. The canister was then
reassembled and placed face down on the surface at each sampling location. Care was exercised not
to push the device into the soil surface. The canister rim was “sealed” to the surface using a berm of
local borrow material.
Five canisters (blanks) were similarly processed for each sample set (ten blanks total) and the
canisters were kept inside an airtight plastic bag during the 24-hour testing period.
5.3 Sample Retrieval
At the end of each of the 24-hour testing periods, the canisters were retrieved, disassembled and each
charcoal sample was individually poured through a funnel into a container. Identification numbers
were transferred to the appropriate container, which was sealed and placed in a box for transport.
Retrieval date and time were recorded on the same data sheets as the sample placement information.
The blank samples were similarly processed. All of the radon flux samples and blanks were
successfully retrieved and containerized during the unloading process.
Tellco personnel maintained custody of the samples from collection through analysis.
3
5.4 Environmental Conditions
A rain gauge and thermometer were placed by Cell 3 to monitor rainfall and air temperatures during
sampling in order to ensure compliance with the regulatory measurement criteria.
In accordance with 40 CFR, Part 61, Appendix B, Method 115:
• Measurements were not initiated within 24 hours of rainfall.
• There was no rainfall during either of the 24-hour sampling periods.
• All of the canister seals remained intact during each of the 24-hour sampling periods.
• The criteria regarding minimum air temperature and frozen ground are not applicable when
performing sampling on a quarterly basis; however, the minimum ambient air temperature
measured during the sampling of Cell 3 was approximately 43° F. The ground was not
frozen.
6. SAMPLE ANALYSIS
6.1 Apparatus
Apparatus used for the analysis:
• Single- or multi-channel pulse height analysis system, Ludlum Model 2200 with a
Teledyne 3" x 3" sodium iodide, thallium-activated (Nal(Tl)) detector.
• Lead shielded counting well approximately 40 cm deep with 5-cm thick lead walls and a 7-
cm thick base and 5 cm thick top.
• National Institute of Standards and Technology (NIST) traceable aqueous solution radium-
226 absorbed onto 180 grams of activated charcoal.
• Ohaus Model C501 balance with 0.1-gram sensitivity.
6.2 Sample Inspection and Documentation
Once in the laboratory, the integrity of each charcoal container was verified by visual inspection of the
plastic container. Laboratory personnel checked for damaged or unsealed containers and verified that
the data sheet was complete.
No damaged or unsealed containers were observed during inspection at the Tellco analytical
laboratory. All 200 samples and ten blanks were ultimately validated after inspection.
6.3 Background and Sample Counting
The gamma ray counting system was checked daily, including background and radium-226 source
measurements prior to and after each counting session. Based on calibration statistics, using two
sources with known radium-226 content, background and source control limits were established for
each Ludlum/Teledyne counting system with shielded well (see Appendix A).
4
Gamma ray counting of exposed charcoal samples included the following steps:
• The length of count time was determined by the activity of the sample being analyzed,
according to a data quality objective of a minimum of 1,000 accrued counts for any given
sample.
• The sample container was centered on the Nal detector and the shielded well door was
closed.
• The sample was counted over a determined count length and then the mid-sample count
time, date, and gross counts were documented on the radon flux measurements data sheet
and used in the calculations.
• The above steps were repeated for each exposed charcoal sample.
• Approximately 10 percent of the containers counted were selected for recounting. These
containers were recounted within a few days following the original count.
7. QUALITY CONTROL (QC) AND DATA VALIDATION
Charcoal flux measurement QC samples included the following intra-laboratory analytical frequency
objectives:
• Blanks, 5 percent, and
• Recounts, 10 percent
All sample data were subjected to validation protocols that included assessments of sensitivity,
precision, accuracy, and completeness. As described below, all Method 115-required data quality
objectives (EPA, 2014) were attained.
7.1 Sensitivity
A total of ten blanks were analyzed by measuring the radon progeny activity in samples subjected to
all aspects of the measurement process, excepting exposure to the source region. These blank sample
measurements comprised approximately five percent of the field measurements. The results of the
blank sample radon flux rates ranged from 0.01 to 0.06 pCi/m2-s, with an average of approximately
0.03 pCi/m2-s. The lower limit of detection (LLD) ranged from approximately 0.03 to 0.04 pCi/m2-s.
7.2 Precision
Twenty recount measurements, distributed throughout the sample sets, were performed by replicating
analyses of individual field samples (see Appendix B). These recount measurements comprised
approximately 10 percent of the total number of samples analyzed. The precision of recount
measurements having results above one (1) pCi/m2-s, expressed as relative percent difference (RPD),
ranged from less than 0.1 percent to 7.1 percent with an average precision of approximately 3.1
percent RPD. This complies with the precision objective of 10 percent RPD.
5
7.3 Accuracy
Accuracy of field measurements was assessed daily by counting two laboratory control samples with
known Ra-226 content. Accuracy of these lab control sample measurements, expressed as percent
bias, ranged from approximately -3.2 percent to +3.2 percent. The arithmetic average bias of the lab
control sample measurements was approximately -0.1 percent (see Appendix A). This complies with
the accuracy objective of +/-10 percent bias.
7.4 Completeness
A combined total of 200 samples (100 samples from the Cell 3 beach region and 100 samples from
the Cell 3 cover regions) were verified, representing 100 percent completeness, which complies with
the completeness objective of 85 percent.
8. CALCULATIONS
Radon flux rates were calculated for charcoal collection samples using calibration factors derived
from cross-calibration to sources with known total activity with identical geometry as the charcoal
containers. A yield efficiency factor was used to calculate the total activity of the sample charcoal
containers. Individual field sample result values presented were not reduced by the results of the field
blank analyses.
In practice, radon flux rates were calculated by a database computer program. The algorithms utilized
by the data base program were as follows:
Equation 8.1:
, _______ NpCi Rn-222/m sec — j'j’s*A*b,|'() ^(<1/91.75^
where:N = net sample count rate, cpm under 220-662 keV peak
Ts = sample duration, seconds
b = instrument calibration factor, cpm per pCi; values used:
0.1698, for M-01/D-21 and
0.1703, for M-02/D-20
d = decay time, elapsed hours between sample mid-time and count mid-time
A = area of the canister, m2
Equation 8.2:
Error, 2a = 2x
Gross Sample, cpm Background Sample,cpm
Sample Count, t, min Background Count, t, min
Net,cpm
x Sample Concentration
6
Equation 8.3:
LLD =2,71 + f4.65VSh)
[Ts*A*b*0.5(d/9r75)]
where: 2.71
4.65
Sb
Ts
b
d
A
= constant
= confidence interval factor
= standard deviation of the background count rate
= sample duration, seconds
= instrument calibration factor, cpm per pCi; values used:
0.1698, for M-01/D-21 and
0.1703, for M-02/D-20
= decay time, elapsed hours between sample mid-time and count mid-time
= area of the canister, m2
9. RESULTS
9.1 Mean Radon Flux
Referencing 40 CFR, Part 61, Subpart W, Appendix B, Method 115 - Monitoring for Radon-222
Emissions, Subsection 2.1.7 - Calculations, "the mean radon flux for each region of the pile and for
the total pile shall be calculated and reported as follows:
(a) The individual radon flux calculations shall be made as provided in Appendix A EPA
86(1). The mean radon flux for each region of the pile shall be calculated by summing all
individual flux measurements for the region and dividing by the total number of flux
measurements for the region.
(b) The mean radon flux for the total uranium mill tailings pile shall be calculated as follows:
Js =
JiAi +... J9A9 r+i... JiAi
At
Where: Js = Mean flux for the total pile (pCi/m2-s)
Ji = Mean flux measured in region i (pCi/m2-s)
Aj = Area of region i (m2)
At = Total area of the pile (m2)”
40 CFR 61, Subpart W, Appendix B, Method 115, Subsection 2.1.8, Reporting states “The results of
individual flux measurements, the approximate locations on the pile, and the mean radon flux for each
region and the mean radon flux for the total stack [pile] shall be included in the emission test report. Any
condition or unusual event that occurred during the measurements that could significantly affect the results
should be reported."
7
9.2 Site Results
Site Specific Sample Results (reference Appendix C)
(a) The mean radon flux for each region within Cell 3 is as follows:
Cell 3 - Beaches Region = 66.2 pCi/m2-s (based on 20,442 m2 area)
Cell 3 - Covered Region = 7.4 pCi/m2-s (based on 258,262 m2 area)
Cell 3 - Water Region = 0.0 pCi/m2-s (based on 10,154 m2 area)
Note: Reference Appendix C of this report for the entire summary of individual measurement results.
(b) Using the data presented above, the calculated mean radon flux rate for Cell 3 is as follows:
Cell 3 = 11.3 pCi/m2-s
f66.2Y20.442Hr7.4Y25 8.262Hf0.0Yl 0.1541 =11.3
288,858
As shown above, the arithmetic mean radon flux rate for Cell 3 is below the NRC and EPA standard
of 20 pCi/m2-s.
Appendix C is a summary of individual measurement results, including blank sample analysis.
Sample locations are depicted on Figure 2, which is included in Appendix D. The map was produced
by Tellco.
8
References
U. S. Environmental Protection Agency, Radon Flux Measurements on Gardinier and Royster
Phosphogypsum Piles Near Tampa and Mulberry, Florida, EPA 520/5-85-029, NTIS #PB86-
161874, January 1986.
U. S. Environmental Protection Agency, Title 40, Code of Federal Regulations, July 2014.
U. S. Nuclear Regulatory Commission, Radiological Effluent and Environmental Monitoring at
Uranium Mills, Regulatory Guide 4.14, April 1980.
U. S. Nuclear Regulatory Commission, Title 10, Code of Federal Regulations, Part 40, Appendix A,
January 2014.
9
Figure 1
Large Area Activated Charcoal Canisters Diagram
Hatfitfl*l-in. Tvi*ck1/4 in. VftfitHDlft ScrubtatM rid
H I/2-iA Thick
Struttier Pia
m SPt ■a naiaintf
SpinB1
1 '2->n. Tliic* C<>drcoa>
Sv|t(A>l f>r*J
10-w
PVC End C*p
FICK!t 1 Larsf-Arei Radon Col) ad or
10
Appendix A
Charcoal Canister Analyses Support Documents
A
ACCURACY APPRAISAL TABLE
MAY 2015 RADON SAMPLING
ENERGY FUELS RESOURCES
WHITE MESA MILL, BLANDING, UTAH
2015 NESHAPs RADON FLUX MEASUREMENTS
CELL 3
SAMPLING DATES: 05/11/15-05/13/15
SYSTEM
I.D.
COUNT
DATE
Bkg Counts
#1
(1 min.
#2
each)
#3
Source Counts (1 min. each)
#1 #2 #3
AVG NET
cpm
YIELD
cpm/pCi
FOUND
pCi
SOURCE
ID
KNOWN
pCi
% BIAS
M-01/D-21 5/14/2015 114 116 107 10119 10077 9976 9945 0.1698 58569 GS-04 59300 -1.2%
M-01/D-21 5/14/2015 119 113 131 10218 10004 10137 9999 0.1698 58885 GS-04 59300 -0.7%
M-01/D-21 5/15/2015 121 125 126 10029 10100 10339 10032 0.1698 59081 GS-04 59300 -0.4%
M-01/D-21 5/15/2015 111 124 106 10338 10455 10227 10226 0.1698 60226 GS-04 59300 1.6%
M-01/D-21 5/14/2015 114 116 107 9876 9853 9847 9746 0.1698 57399 GS-05 59300 -3.2%
M-01/D-21 5/14/2015 119 113 131 9964 10011 10035 9882 0.1698 58200 GS-05 59300 -1.9%
M-01/D-21 5/15/2015 121 125 126 9829 9873 10036 9789 0.1698 57648 GS-05 59300 -2.8%
M-01/D-21 5/15/2015 111 124 106 10085 9895 9973 9871 0.1698 58131 GS-05 59300 -2.0%
M-02/D-20 5/14/2015 138 107 132 10448 10584 10602 10419 0.1703 61180 GS-04 59300 3.2%
M-02/D-20 5/14/2015 146 134 123 10475 10402 10414 10296 0.1703 60458 GS-04 59300 2.0%
M-02/D-20 5/15/2015 131 126 121 10374 10553 10533 10361 0.1703 60838 GS-04 59300 2.6%
M-02/D-20 5/15/2015 117 149 120 10611 10333 10367 10308 0.1703 60530 GS-04 59300 2.1%
M-02/D-20 5/14/2015 138 107 132 10375 10211 10145 10118 0.1703 59413 GS-05 59300 0.2%
M-02/D-20 5/14/2015 146 134 123 10232 10350 10215 10131 0.1703 59491 GS-05 59300 0.3%
M-02/D-20 5/15/2015 131 126 121 10184 10296 10043 10048 0.1703 59004 GS-05 59300 -0.5%
M-02/D-20 5/15/2015 117 149 120 10042 10236 10282 10058 0.1703 59060 GS-05 59300 -0.4%
AVERAGE PERCENT BIAS FOR ALL ANALYTICAL SESSIONS:-0.1%
CHARCOAL CANISTER ANALYSIS SYSTEM
SITE LOCATION: NjJ Vv\4 ^ ^ ^ B d ~tVUj } ^A~T
CLIENT: E* V't\f9fJ PvA<U ^Our __________________________
Calibration Check I .og
System ID: / D~^ ^ Calibration Date: _ (til'll'H Due Date:_ bln/iS
Scaler S/N: _ 5'S7^ High Voltage: -U3C7 _ Window: 4.42 Thrshld: 2.20
Detector S/N: 0 M ^ .^3______Source ID/SN:^^'! ^j~QLf Source Activity:
Blank Canister Bkgd. Range, cpm: 2<s =
Gross Source Range, cpm: 2 a =
Jti.
°i<Zo\
to lt#(
tojo^Bl
Technician:
3.- 33 to ^ U
to io~re~3
All counts times are one minute.
P~
?<?<*
Prt
Po<frt~
Date By Background Counts (1 min, each)
#1 #2 #3 Avg.#1
Source Counts (1 min, each)
#2 #3 Average
ok?
Y/N
IS \l
M
IO7.1 I 100-77 IOO S'7
5/W/.IS £24=a i£>
lS
lOXis lnOo4 KMS~7 Orz-Q z
ShSfiS-lOO*2-°V toioq 1^3.&1 *syisMra^■1U lOI*.ns;10 13 455 107.7-'1 Q3HO £
Y/N: Y = average background and source cpm falls within the control limits.
N = average background and source cpm does not fall within the control limits.
The acceptable ranges were determined from prior background and source check data.
SITE LOCATION:,
f^v-e-StfiK/'ct'S_______________________
CHARCOAL CANISTER ANALYSIS SYSTEM
CLIENT:^f
System ID: \A-0 1 J 1
Scaler S/N: 5 1^> ~1 2~
Detector S/N: OM~ I ^ ~^3______
Blank Canister Bkgd. Range, cpm: 2 o =
Gross Source Range, cpm: 2 a = °ieii
Technician:
Calibration Check Log
__ Calibration Date: & /^~"7 j ) Due Date: k/'7-~7/fC>
High Voltage: 1 ^7 Window: 4.42 Thrshld: 2.20
Source ID/SN: Source Activity:
^ S to 1G> f3 a = ^ ^ to t~7
loS66~ 3a= 9^i8 to lo~7~7Sto
All counts times are one minute.
Pee
P 05f
fes
Date By Background Counts (1 min, each)
#1 #2 #3 Avg.
in-
t
#1
Source Counts (1 min, each)
#2
3HZ
#3 Average
IM
ok?
Y/N
2^U
5 P=
JL£.1C? "7
iDOOl112._L2_i.
5=7
WO?*?V
Sji2jl£
13-5
-L3±t
17- (o 00 X
Y/N: Y = average background and source cpm fells within the control limits.
N = average background and source cpm does not fall within the control limits.
The acceptable ranges were determined from prior background and source check data.
CHARCOAL CANISTER ANALYSIS SYSTEM
SITE LOCATION: W.\\ > ^ UT
CLIENT: ^A/U?U SO<AlTC<f S____________________
System ID: J
5" i S(*3Scaler S/N:
Calibration Check Log
Calibration Date: Due Date:_ (i I >7 j l$~
High Voltage: ® SO
Window: 4.42 Thrshld: 2.20
Detector S/N:
BlankCanister Bkgd. Range, cpm: 2 a =
Gross Source Range, cpm:
Source ID/SN: jQ S ~ O^ource Activity: 5°) *3 \^S C.\
°\~b to lS~5" 3ct= ~7~y to n I
2a= to lQ^3b 3 q= ^S?)0) to IQ®^
Technician:
All counts times are one minute.
?re
fo^t
PrC
fosf
Date By Background Counts (1 min, each)
#1 #2
\&7
#3 Avg.#1
Source Counts (1 min, each)
#2 #3 Average
ok?
Y/N
_isa l'VZ-I'SLt-'105^l OtoO'i->Q^d 2-
5/»5//-S-W3 1M L/-13I I >3.1047.3 i 1O41&10^30 2
J3-L -12=!4-30-life.mi -0553 .Ar?£5 (0^67
J-JL3 -iHSL 17-1?ipfr n 10333 1031-7 >0437
Y/N: Y = average background and source cpm falls within the control limits.
N = average background and source cpm does not fall within the control limits.
The acceptable ranges were determined from prior background and source check data.
CHARCOAL CANISTER ANALYSIS SYSTEM
SITE LOCATION: VJ K A^A, \
CLIENT
System ID: M I
St5(x3Scaler S/N:
Detector S/N: OM'S 33-
Calibration Check Log
__ Calibration Date: Due Date:_
High Voltage: Window: 4.42 Thrshld: 2.20
Source ID/SN:^fl?~^"^ jG& ~ O Source Activity: S9 ‘3
3 a= 71 to n \
to \O70g_
93 to i^>5Blank Canister Bkgd. Range, cpm: 2o =
Gross Source Range, cpm: 2 a = IS to 105 MS' 30= T7S1
Technician:
All counts times are one minute.
Prc.
Post
Fr*
?a$t
Date
M
5/7
By
tzz:
Background Counts (1 min, each)
#1
m
#2 #3 Avg.
Source Counts (1 min, each)
#1
1031S
#2 #3 Average
ok?
Y/N
**/»5 433 L^k.\om*?lQ33?i..y.
133 i3t±yp-xyz-Ip35D (oaiST |Q-2-L>U
n/.rz/r5
/ts'/iS
2i
1^-I©m
1-2^ipoht. Ip^
/0^r?cog3' 1Q1-7S
< 1010 7 1
Y/N: Y = average background and source cpm falls within the control limits.
N = average background and source cpm does not fall within the control limits.
The acceptable ranges were determined from prior background and source check data.
BALANCE OPERATION DAILY CHECK
Balance Model: 0*31*3 ?0r\'O 1 3. 3 O 7
Standard Weight (g):______3 OQ , Q ^
Date Pre-check (g)Post-check (g)O.K. ± 0.1 % ?By
5 Iwh?3 oo. O 3 oo. o
5//s/'r/T 3£?C>. o ■Y C&ys
Appendix B
Recount Data Analyses
B
CLIENT: ENERGY FUELS RESOURCES PROJECT: RADON FLUX MEASUREMENTS, WHITE MESA MILL PROJECT NO.: 15004.02
PILE: 3 BATCH: D SURFACE: TAILINGS
AREA: BEACH DEPLOYED: 5 11 15 RETRIEVED: 5
FIELD TECHNICIANS: CE.DLC, CS, TE COUNTED BY: DLC
COUNTING SYSTEM I.D.: M01/D21, M02/D20 CAL. DUE: 6/27/15
AIR TEMP MIN: 43°F
12 15 CHARCOALBKG:
DATA ENTRY BY: DLC
WEATHER: CLEAR, NO RAIN
148 cpm Wt. Out: 180.0 g.
TARE WEIGHT: 29.2 g.
RECOUNT CANISTER ANALYSIS:
LOCATION
DIO
RECOUNT
D20
RECOUNT
D30
RECOUNT
D4 0
RECOUNT
D50
RECOUNT
D60
RECOUNT
D70
RECOUNT
D80
RECOUNT
D90
RECOUNT
DlOO
RECOUNT
SAMPLE RETRIV ANALYSIS MID-TIME CNT GROSS GROSS RADON + LLD
I. D. HR MIN HR MIN MO DA YR HR MIN (MIN) COUNTS WT IN pCi/m2s pCi/m2s pCi/m2s
DIO
DIO
D2 0
D20
D3 0
D30
D4 0
D4 0
D50
D50
D60
D60
D70
D70
D80
D80
D90
D90
DlOO
DlOO
8
8
8
8
9
9
9
9
9
9
8
8
8
8
9
9
9
9
9
9
39
39
49
49
9
9
19
19
29
29
39
39
49
49
9
9
19
19
33
33
8
8
8
8
9
9
9
9
9
9
8
8
8
8
9
9
9
9
9
9
45
45
50
50
6
6
10
10
15
15
45
45
50
50
7
7
12
12
20
20
5 14 15 14 29
5 15 15 15 12
5 14 15 14 36
5 15 15 15 12
5 14 15 14 43
5 15 15 15 13
14 15 14
15 15 15
14 15 15
15 15 15
14 15 15
15 15 15
51
13
14 15 14 58
15 15 15 15
6
15
5 14 15 15 13
5 15 15 15 16
20
16
5 14 15 15 27
5 15 15 15 18
1
1
1
1
1
1
1
1
1
1
14
15
15
15
15
15
35
18
1
1
1
1
1
1
1
1
76051
59923
17305
13942
14944
12627
40801
32867
1 36835
1 31668
5062
4097
115530
98016
15543
12450
15034
13077
224.4
224.4
9483 227.7
7976 227.7
221.1
221.1
224.7
224.7
225.3
225.3
222.7
222.7
225.7
225.7
223.6
223.6
224.8
224.8
160.5
152.8
19.8
20.0
36.5
35.4
31.6
32.0
87.1
84.4
78.0
80.4
10.5
10.1
221.1 246.2
221.1 250.0
33.0
31.6
32.0
33.3
16.1 0.04
15.3 0.05
2.0
2.0
3.7
3.5
3.2
3.2
8.7
8.4
7.8
8.0
1.1
1.0
24.6
25.0
3.3
3.2
3.2
3.3
0.04
0.05
0.04
0.05
0.04
0.05
0.04
0.05
0.04
0.05
0.04
0.05
0.04
0.05
0.04
0.05
0.04
0.05
PRECISION
% RPD
4.9%
1.01
3.1%
1.31
3.1%
3.01
3.9%
1.51
4.3%
4.01
AVERAGE PERCENT PRECISION FOR THE CELL 3 BEACH REGION:3 . 01
Page 1 of 1
CLIENT: ENERGY FUELS RESOURCES PROJECT: RADON FLUX MEASUREMENTS, WHITE MESA MILL PROJECT NO.: 15004.02
PILE: 3 BATCH: E SURFACE: SOIL
12AREA: COVER DEPLOYED: 5
FIELD TECHNICIANS: CE.DLC, CS, TE
COUNTING SYSTEM I.D.: M01/D21, M02/D20
15 RETRIEVED: 5
COUNTED BY: DLC
CAL. DUE: 6/27/15
AIR TEMP MIN: 43°F
13 15 CHARCOALBKG:
DATA ENTRY BY: DLC
WEATHER: CLEAR, NO RAIN
149 cpm Wt. Out: 180.0 g.
TARE WEIGHT: 29.2 g.
RECOUNT CANISTER ANALYSIS:
LOCATION
ElO
RECOUNT
E20
RECOUNT
E30
RECOUNT
E4 0
RECOUNT
.
E50
RECOUNT
E60
RECOUNT
E70
RECOUNT
E80
RECOUNT
E90
RECOUNT
ElOO
RECOUNT
SAMPLE
I. D.
ElO
ElO
E20
E20
E30
E30
E40
E4 0
E50
E50
E60
E60
E70
E70
E80
E80
E90
E90
ElOO
ElOO
RETRIV ANALYSIS MID-TIME CNT GROSS GROSS RADON ± LLD
HR MIN HR MIN MO DA YR HR MIN (MIN) COUNTS WT IN pCi/m2s pCi/m2s pCi/m2 s
10 26 10 25
10 26 10 25
10 48 10 39
10 48 10 39
11 11 10
11 11 10
11 33
11 33
10 24
10 24
10 20
10 20
10 56
10 56
10
10
11
11
11
11
53
53
20
20
41
41
53
53
10 59
10 59
10 34
10 34
10
10
32
32
10 48
10 48
10
10
11
11
11
11
46
46
1
1
2
2
5 14 15 15 48
5 15 15 15 22
5 14 15 16
5 15 15 15
5 14 15 16
5 15 15 15
14 15
15 15
16
15
5 14 15
5 15 15
16
15
5 14 15 17
5 15 15 15
14 15 17
15 15 15
1
21
15
26
25
25
5 14 15 16 37
5 15 15 15 28
49
28
5
29
12
29
5 14 15 17 25
5 15 15 15 32
14
15
15
15
17
15
36
31
3
4
2
2
2
2
1
1
1
1
1
1
1
1
1
1
2
2
1
1
1001
1132
1344
1215
1262
1020
25850
22118
3940
3346
1997
1751
2602
2091
3175
2772
1364
1213
6546
5756
220.4
220.4
221.7
221.7
220.3
220.3
216.5
216.5
218.5
218.5
221.6
221.6
224.5
224.5
218.7
218.7
223.3
223.3
218.6
218.6
0.33
0.28
0.93
0.97
0.86
0.77
46.4
47.2
6.7
6.7
3.3
3.4
4.4
4.1
5.4
5.6
0.96
0.98
11.7
12.1
0.0
0.0
0.1
0.1
0.1
0.1
4.6
4.7
0.7
0.7
0.3
0.3
0.4
0.4
0.5
0.6
0.1
0.1
1.2
1.2
0.03
0.04
0.03
0.04
0.03
0.04
0.03
0.04
0.03
0.04
0.03
0.04
0.03
0.04
0.03
0.04
0.03
0.04
0.03
0.04
PRECISION
% RPD
16.4%
4.2%
11.0%
1.71
0.0%
3.01
7.1%
3.61
2.1%
3.41
AVERAGE PERCENT PRECISION FOR THE CELL 3 COVER REGION:5.21
Appendix C
Radon Flux Sample Laboratory Data (including Blanks)
CLIENT: ENERGY FUELS RESOURCES PROJECT: RADON FLUX MEASUREMENTS, WHITE MESA MILL PROJECT NO.: 15004.02
PILE: 3 BATCH: D SURFACE: TAILINGS AIR TEMP MIN: 43°F WEATHER: CLEAR, NO RAIN
AREA: BEACH DEPLOYED: 5 11 15 RETRIEVED: 5 12 15 CHARCOAL BKG: 148 cpm Wt. Out: 180.0 g.
FIELD TECHNICIANS: CE,DLC, CS, TE COUNTED BY: DLC DATA ENTRY BY: DLC TARE WEIGHT: 29.2 g.
COUNTING SYSTEM I.D.: M01/D21, M02/D20 CAL. DUE: 6/27/15
LOCATION
DOl
D02
D03
D04
DO 5
D06
D07
DO 8
D09
DIO
Dll
D12
D13
D14
D15
D16
D17
D18
D19
D2 0
D21
D22
D23
D24
D25
' ' .LI
D26
D27
D28
D2 9
D30
D31
D32
D33
D34
D35
D36
D3 7
SAMPLE
I. D.
DOl
D02
D03
D04
DOS
DOS
D07
D08
D09
DIO
Dll
D12
D13
D14
D15
D16
D17
D18
D19
D2 0
D21
D22
D23
D24
D25
D26
D27
D2 8
D29
D30
D31
D32
D33
D34
D3 5
D36
D37
DEPLOY RETRIV ANALYSIS MID-TIME CNT GROSS GROSS RADON ± LLD
HR MIN HR MIN MO DA YR HR MIN (MIN) COUNTS WT IN pCi/m2 s pCi/m2 s pCi/m2 s COMMENTS:
8
8
8
8
8
8
8
8
8
8
8
8
8
8
8
8
8
8
8
8
8
8
8
8
8
9
9
9
9
9
9
9
9
9
9
9
9
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
5
6
7
8
9
10
11
12
13
14
15
16
8
8
8
8
8
8
8
8
8
8
8
8
a
8
8
8
8
8
8
8
8
8
8
8
8
9
9
9
9
9
9
9
9
9
9
9
9
41
41
42
42
43
43
44
44
45
45
46
46
47
47
48
48
49
49
50
50
51
51
52
52
53
4
4
5
5
6
6
7
7
8
8
9
9
5
5
5
5
5
5
5
5
5
5
5
5
5
5
5
5
5
5
5
5
5
5
5
5
5
5
5
5
5
5
5
5
5
5
5
5
5
14 15 14
14 15
14 15
14
14
14
14 15
14 15
14 15
14 15 14
14 15 14
14 15
14 15
14 15
14
14
14
14 15 14
14
14
14 15
14 15
14 15 14
14 15 14
14
14
14
14
14 15
14 15
14 15 14
14 15 14
14 15
14 15
14 15 14
14 15 14
14 15 14
14 15 14
14 15 14
14 15 14
14
14
14 15 14
14 15 14
14 15
14 15
14 15 14
14 15 14
14 15 14
14 15 14
14 15 14
14
14
23
23
24
24
26
26
27
27
29
29
30
30
32
32
33
33
34
34
36
36
37
37
39
39
40
40
42
42
43
43
45
45
46
46
48
48
49
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
3666
8460
2625
21286
7001
13542
103608
39664
45263
76051
32554
5949
48867
32563
14297
23321
25554
26341
21080
9483
35181
44130
18650
23198
12280
19523
10249
17987
17370
17305
9393
24339
21392
33135
18346
26012
17116
227.1
225.4
223.4
228.8
229
224
223
226
226
224
229
222
225
226
226.0
225.3
227.1
227.9
224.0
227.7
224.4
225.7
223.3
224.7
226.2
239.5
226.2
225.0
222.5
221.1
234.6
224.9
222.2
224.4
228.1
224.8
223.1
7.4
17.5
5.2
44.6
14.5
28.3
219.2
83
95
160
68
12.3
103.4
68.7
30.1
49.1
54.0
55.5
44.5
19.8
74.6
93.4
39.4
49.0
25
41
21
37.9
36.7
36.5
19.7
51.4
45.3
70.2
38.9
55.1
36.3
.9
.1
. 5
.7
.8
. 5
, 5
5
.8
. 9
.4
.6
0.
1.
0 .
4 .
1.
2.
21.
8 .
9.
16.1
6.9
1.2
10.3
6.9
3 .
4 ,
5 .
5,
4 .
2.
7.
9.
3
4 .
2.
0
9
.4
.6
. 5
. 0
,5
.3
. 9
. 9
.6
4.1
2.2
3 .
3.
3 .
2 .
5 .
4 ,
7.0
3.9
5.5
3.6
0.04
0.04
0.04
0.04
0.04
0.04
0.04
0.04
0.04
0.04
0.04
0.04
0.04
0.04
0.04
0.04
0.04
0.04
0.04
0.04
0.04
0.04
0.04
0.04
0.04
0.04
0.04
0.04
0.04
0.04
0.04
0.04
0.04
0.04
0.04
04
04
Page 1 of 3
CLIENT: ENERGY FUELS RESOURCES PROJECT: RADON FLUX MEASUREMENTS, WHITE MESA MILL PROJECT NO.: 15004.02
PILE: 3 BATCH: D SURFACE: TAILINGS AIR TEMP MIN: 43°F WEATHER: CLEAR, NO RAIN
AREA: BEACH DEPLOYED: 5 11 15 RETRIEVED: 5 12 15 CHARCOAL BKG: 148 cpm Wt. Out: 180.0 g.
FIELD TECHNICIANS: CE.DLC, CS, TE COUNTED BY: DLC DATA ENTRY BY: DLC TARE WEIGHT: 29.2 g.
COUNTING SYSTEM I.D.: M01/D21, M02/D20 CAL. DUE: 6/27/15
11 j #SSS®|i i
LOCATION
D38
D3 9
D40
D41
D42
D43
D44
D45
D46
D47
D48
D4 9
D50
D51
D52
D53
D54
D55
D56
D57
D58
D59
D60
D61
D62
D63
D64
D65
D66
D67
D68
D69
D70
D71
D72
D73
D74
SAMPLE
D3 8
D3 9
D40
D41
D42
D43
D44
D45
D46
D47
D48
D49
D50
D51
D52
D53
D54
D55
D56
D57
D58
D59
D60
D61
D62
D63
D64
D65
D66
D67
D68
D69
D70
D71
D72
D73
D74
DEPLOY RETRIV ANALYSIS MID-TIME CNT GROSS
HR MIN HR MIN MO DA YR HR MIN (MIN) COUNTS
GROSS RADON
9
9
9
9
9
9
9
9
9
9
9
9
9
8
8
8
8
8
8
8
8
8
8
8
8
8
8
8
8
8
8
8
8
8
8
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
9
9
9
9
9
9
9
9
9
9
9
9
9
8
8
8
8
8
8
8
8
8
8
8
8
8
8
8
8
8
8
8
8
8
8
53 8
42
10
10
11
11
12
12
13
13
14
14
15
15
41
41
42
42
43
43
44
44
45
45
46
46
47
47
48
48
49
49
50
50
51
51
52
52
5
5
5
5
5
5
5
5
5
5
5
$
5
5
5
5
5
5
5
5
5
5
5
5
5
5
5
5
5
5
5
5
5
5
5
5
14 15
14 15
14
14
14 15 14
14
14
14 15 14
14 15 14
14 15
14 15
14 15 14
14 15 14
14 15 14
14 15 14
14 15 14
14 15 14
14 15 15
14 15 15
14 15 15
14 15 15
14 15 15
14 15 15
14 15 15
14 15
14 15
14 15 15
14 15 15
14 15 15
14 15
14 15
14 15 15
14 15 15
14 15
14 15
14 15 15
14 15 15
14 15 15
14 15 15
14 15 15
14 15 15
15
15
15
15
15
15
49
51
51
52
52
54
54
55
55
57
57
58
58
0
0
1
1
3
3
4
4
6
6
7
7
8
8
10
10
11
11
13
13
14
14
16
16
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
32194
8126
14944
34238
12447
11000
33180
24871
9147
12374
46873
14514
40801
2205
5422
11134
5112
3431
42561
129853
115208
79241
36835
89369
76581
99506
118602
11786
6840
9452
9406
8020
5062
5787
10339
6727
3167
221.6
222
222
227
224
221
223.2
227.3
223.4
222.6
224.8
225.7
230.7
228.9
227.0
227.1
. 6
.0
.2
.2
0.04
0.04
0.04
0.04
0.04
0.04
0.04
04
04
WT IN pCi/m2s pCi/m2s pCi/m2s COMMENTS:
225.8
225.5
224.7
224.2
227.0
221.6
229.8
227.2
220.0
222.8
225.1
229.7
225.3
230.0
226.2
221.4
228.7
223.6
219.3
223.0
221.5
66.7
17.1
31.6
73.0
26.3
23.2
70 .
53 .
19.
26 .
100.0
30.8
87.1
4.4
11.2
23.3
10.5
7.0
90.0
276.0
244.3
168.5
78.0
190.1
162.5
211.9
252.0
24.8
14.2
19.9
19.7
16.8
10.5
12.1
21.7
14.1
6.4
6.7
1.7
3.2
7.3
2.6
2.3
7.1
5.3
1.9
2.6
10.0
3.1
8.7
0.4
1.1
2.3
1.1
0.7
9.0
27.6
24.4
16.8
7.8
19.0
16.3
21.2
25.2
2.5
1.4
2.0
2.0
1.7
1.0
1.2
2.2
1.4
0.6
0.04
0.04
0.04
0.04
0.04
0.04
0.04
0.04
0.04
0.04
0.04
0.04
0.04
0.04
0.04
0.04
0.04
0 .
0.
0.
04
04
04
0.04
0.04
0.04
0.04
0.04
0.04
0.04
0.04
CLIENT: ENERGY FUELS RESOURCES PROJECT: RADON FLUX MEASUREMENTS, WHITE MESA MILL PROJECT NO.: 15004.02
PILE: 3 BATCH: D SURFACE: TAILINGS AIR TEMP MIN: 43°F WEATHER: CLEAR, NO RAIN
AREA: BEACH DEPLOYED: 5 11 15 RETRIEVED: 5 12 15 CHARCOAL BKG: 148 cpm Wt. Out: 180.0 g.
FIELD TECHNICIANS: CE.DLC, CS, TE COUNTED BY: DLC DATA ENTRY BY: DLC TARE WEIGHT: 29.2 g.
COUNTING SYSTEM I.D.: M01/D21, M02/D20 CAL. DUE: 6/27/15
LOCATION
D75
D76
D77
D78
D79
D80
D81
D82
D83
D84
.08.5 '
D87
D88
D89
D90
D91
D92
D93
D94
D95
D96
D97
D98
D99
D100
SAMPLE DEPLOY RETRIV ANALYSIS MID-TIME CNT GROSS GROSS RADON + LLD
I- D. HR MIN HR MIN MO DA YR HR MIN (MIN) COUNTS WT IN pCi/m2s pCi/m2s pCi/m2 s COMMENTS:
D75
D76
D77
D78
D79
D80
D81
D82
D83
D84
D85
D86
D87
D88
D8 9
mo
D91
D92
D93
D94
D95
D96
D97
D98
D99
D100
8
9
9
9
9
9
9
9
9
9
9
9
9
9
9
9
9
9
9
9
9
9
9
9
54
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
29
30
31
32
33
8
9
9
9
9
9
9
9
9
9
9
9
9
9
9
9
9
9
9
9
9
9
9
9
9
9
53
5
5
6
6
7
7
8
8
9
9
10
10
11
11
12
12
13
13
14
14
18
18
19
19
20
5
5
5
5
5
5
5
5
5
5
5
5
5
5
5
5
5
5
5
5
5
5
5
5
5
5
14 15
14 15
15
15
14 15 15
14 15 15
14 15 15
14 15 15
14 15 15
14 15
14 15
14 15
14 15 15
14 15 15
14 15
14 15
14 15 15
14 15 15
14 15 15
14 15 15
14 15 15
14 15 15
14 15
14 15
14 15 15
14 15 15
14 15 15
14 15 15
15
15
15
15
15
15
15
17
17
19
19
20
20
22
22
23
23
24
24
26
26
27
27
29
29
30
30
32
32
33
33
35
35
1
1
1
1
1
1
'1'
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
17569
71008
112090
30251
64289
115530
90324
79695
21858
5701
16515
18022
7352
31442
18704
15543
4772
22704
24202
18911
42239
48794
47911
36106
32634
15034
222.4
220.4
221.4
220.0
222
221
222
222
222
230
221
226
225
222.1
222.8
223
222
219
220
225
224
220
223
221
224.4
224.8
37.3
151.0
239.4
64.2
137.3
246.2
193.1
169.8
46.5
11.
35.
38.
15 .
67.0
39.8
33.0
9 ,
48 ,
51.
40.
90.6
104.4
102.8
77.3
70.0
32.0
. 9
.1
.2
. 5
. 9
.3
.7
.2
3.7
15.1
23.9
6.4
13.7
24
19
17
4
1
3
3.8
1.5
6.7
0.04
0.04
0.04
0.04
0.04
0.04
0.04
0.04
0.04
0.04
0.04
0.04
4
3
1
4
5
4
9
10
10
.0
.3
.0
.8
.2
.0
. 1
.4
.3
0 .
0 .
0 .
0 .
04
04
04
04
7.7
7.0
3.2
0.04
0.04
0.04
0.04
0.04
0.04
0.04
0.04
0.04
0.04
AVERAGE RADON FLUX RATE FOR THE CELL 3 BEACH REGION:66.2 pCi/m2s
BLANK CANISTER ANALYSIS:
SAMPLE
I . D.
4T
276.0 MAX
LOCATION
RETRIV ANALYSIS MID-TIME
HR MIN HR MIN MO DA YR HR MIN
IME CNT GROSS GROSS RADON ± LLD
MIN (MIN) COUNTS WT IN pCi/m2s pCi/m2s pCi/m2s COMMENTS:
RADON
D BLANK 1 D BLANK 180
D BLANK 2 D BLANK 280
D BLANK 3 D BLANK 380
D BLANK 4 D BLANK 480
D BLANK 5 D BLANK 580
8 30 5 14 15 10 8 10 1534 210.5 0.01 0.03 0.04 CONTROL
8 30 5 14 15 10 8 10 1741 211.4 0.05 0.03 0.04 CONTROL
8 30 5 14 15 10 19 10 1605 210.2 0.03 0.03 0.04 CONTROL
8 30 5 14 15 10 19 10 1760 211.1 0.06 0.03 0.04 CONTROL
8 30 5 14 15 10 30 10 1599 211.2 0.02 0.03 0.04 CONTROL
AVERAGE BLANK CANISTER ANALYSIS FOR THE CELL 3 BEACH REGION: 0.03 pCi/m2 s
Page 3 of 3
CLIENT: ENERGY FUELS RESOURCES PROJECT: RADON FLUX MEASUREMENTS, WHITE MESA MILL PROJECT NO.: 15004.02
PILE: 3 BATCH: E SURFACE: SOIL AIR TEMP MIN: 43°F WEATHER: CLEAR, NO RAIN
AREA: COVER DEPLOYED: 5 12 15 RETRIEVED: 5 13 15 CHARCOAL BKG: 149 cpm Wt. Out: 180.0 g.
FIELD TECHNICIANS: CE,DLC, CS, TE COUNTED BY: DLC DATA ENTRY BY: DLC TARE WEIGHT: 29.2 g.
COUNTING SYSTEM I.D.: M01/D21, M02/D20 CAL. DUE: 6/27/15
LOCATION
EOl
E02
E03
E04
EOS
E06
E07
E08
EOS
ElO
Ell
E12
E13
E14
E15
E16
E17
E18
E19
E20
E21
E22
E23
E24
E25
E26
E27
E28
E29
E3 0
E31
E32
E33
E34
E35
E36
E37
SAMPLE
I. D.
EOl
E02
E03
E04
E05
E06
E07
E08
E09
ElO
Ell
E12
E13
E14
E15
E16
E17
E18
E19
E20
E21
E22
E23
E24
E25
E26
E27
E28
E2 9
E30
E31
E32
E33
E34
E35
E36
E3 7
DEPLOY RETRIV ANALYSIS MID-TIME CNT GROSS GROSS RADON + LLD
HR MIN HR MIN MO DA YR HR MIN (MIN) COUNTS WT IN pCi/m2s pCi/m2s pCi/m2 s COMMENTS:
10
10
10
10
10
10
0
4
8
11
14
17
10 20
10 22
10 24
10 26
10 28
10 30
10 33
10 35
10 37
10 39
10 41
10 43
10 46
10 48
10 50
10
10
10
10
11
11
11
11
11
11
11
52
54
56
59
2
4
6
9
11
13
15
11 18
11 20
10
10
10
10
10
20
20
21
21
22
10 23
10 23
11
11
22
24
11 26
10
10
10
10
10
10
10
10
10
10
10
10
10
10
10
10
10
10
10
10
10
10
10
10
10
10
10
10
10
10
24
24
25
26
26
35
35
36
36
37
38
38
39
39
40
41
41
50
50
51
51
52
53
53
54
54
55
56
56
57
5
5
5
5
5
5
5
5
5
5
5
5
5
5
5
5
5
5
5
5
5
5
5
5
5
5
5
5
5
5
5
5
5
5
5
5
5
14
14
14
14
14
14
14
14
14
14
14
14
14
14
14
14
14
14
14
14
14
14
14
14
14
14
14
14
14
14
14
14
14
14
14
14
14
15 15
15 15
15 15
15 15
15 15
15 15
15 15
15 15
15 15
15 15
15 15
15 15
15 15
15 15
15 15
15 15
15 15
15 15
15
15
16
16
15 16
15 16
15
15
16
16
15 16
15 16
15 16
15 16
15 16
15 16
15 16
15 16
15 16
15 16
15
15
16
16
15 16
37
36
39
39
41
41
45
44
47
48
50
50
52
52
54
54
57
58
1
1
5
5
9
8
12
12
13
13
15
15
18
18
20
20
21
21
23
2
1
1
1
3
2
3
2
1
3
1
1
2
1
2
1
1
3
3
2
3
4
3
1
1
1
1
1
1
2
2
1
1
1
1
1
2
1061
2009
2004
1202
1028
1268
1004
1432
2450
1001
1152
10397
1633
1027
1175
9098
1357
1404
1187
1344
1267
1088
1231
9870
2112
1988
2673
6020
5000
1262
1168
47915
34345
4407
1064
2988
1695
214.4
214.4
224.4
220.6
224.4
220.9
219.4
221.0
222.9
220.4
220.1
221.6
223.7
222.8
227.0
219 ,
222 ,
220.
223 .
221 ,
218.
218 .
219 ,
221 ,
219.
222.6
219.8
223 .
223.
220 .
224 .
221.
219.0
225.2
222.4
216.8
218.9
. 9
.6
.7
. 9
. 7
.4
.3
. 3
. 6
.2
0.3
. 8
. 1
.2
.5
.1
.6
.4
. 9
.5
1 ,
18 .
1.
1.
0.8
15.8
2 .
0.
0 ,
0 .
0.
0.2
0.5
17.3
3.5
3.3
4.5
10.5
8.7
0.9
0.8
85.5
61.5
7.6
1.6
5.1
1.3
0.0
0.1
0.4
0.0
0.2
1.8
0.1
0.2
0.1
1.6
0.2
0.1
0.0
0.0
1.7
0.3
0.03
0.03
0.03
0.03
0.03
0.03
0.03
0.03
0.03
0.03
0.03
0.03
0.03
0.03
0.03
0.03
0.03
0.03
0.03
0.03
0.03
.03
.03
0.2
0.5
0.1
0.03
0.03
0.03
0.03
0.03
0.03
0.03
0.03
0.03
0.03
0.03
0.03
0.03
0.03
CLIENT: ENERGY FUELS RESOURCES PROJECT: RADON FLUX MEASUREMENTS, WHITE MESA MILL PROJECT NO.: 15004.02
PILE: 3 BATCH: E SURFACE: SOIL AIR TEMP MIN: 43°F WEATHER: CLEAR, NO RAIN
AREA: COVER DEPLOYED: 5 12 15 RETRIEVED: 5 13 15 CHARCOAL BKG: 149 cpm Wt. Out: 180.0 g.
FIELD TECHNICIANS: CE.DLC, CS, TE COUNTED BY: DLC DATA ENTRY BY: DLC TARE WEIGHT: 29.2 g.
COUNTING SYSTEM I.D.: M01/D21, M02/D20 CAL. DUE: 6/27/15
LOCATION
E38
E39
E40
E41
E42
E43
E44
E45
E46
E47
E48
E49
E50
E51
E52
E53
E54
E55
E56
E57
E58
E59
E60
E61
E62
E63
E64
E65
E66
E67
E68
E69
E70
E71
E72
E73
E74
SAMPLE
I. D.
E38
E39
E40
E41
E42
E43
E44
E45
E46
E47
E48
E49
E50
E51
E52
E53
E54
E55
E56
E57
E58
E59
E60
E61
E62
E63
E64
E65
E66
E67
E68
E69
E70
E71
E72
E73
E74
DEPLOY RETRIV ANALYSIS MID-TIME CNT GROSS
HR MIN HR MIN MO DA YR HR MIN (MIN) COUNTS
11
11
11
11
11
11
10
10
10
10
10
10
10
10
10
10
10
10
10
10
10
10
10
10
10
10
10
10
10
10
10
10
10
10
11
11
11
28
31
33
35
37
39
0
4
8
12
16
20
24
28
32
36
40
0
4
8
12
16
20
24
28
32
36
40
44
47
50
53
56
59
2
5
8
10
10
10
10
11
11
10
10
10
10
10
10
10
10
10
10
10
10
10
10
10
10
10
10
10
10
10
10
10
10
10
10
10
10
10
10
10
57
58
59
59
0
0
25
26
28
29
31
32
34
35
37
38
40
25
26
28
29
31
32
34
35
37
38
40
42
43
45
46
48
49
51
52
54
5
5
5
5
5
5
5
5
5
5
5
5
5
5
5
5
5
5
5
5
5
5
5
5
5
5
5
5
5
5
5
5
5
5
5
5
5
14
14
14
14
14
14
14
14
14
14
14
14
14
14
14
14
14
14
14
14
14
14
14
14
14
14
14
14
14
14
14
14
14
14
14
14
14
15 16
15 16
15 16
15 16
15 16
15 16
15 16
15 16
15 16
15 16
15 16
15 16
15 16
15 16
15 16
15 16
15 16
15 16
15 16
15 16
15 16
15 16
15 16
15 16
15 16
15 16
15 16
15 16
15 16
15 17
15 17
15 17
15 17
15 17
15 17
15 17
15 17
23
25
25
27
27
29
29
31
32
35
34
37
37
40
39
43
42
45
46
48
48
49
49
51
52
55
56
58
59
3
2
5
5
7
7
8
8
2
1
1
1
2
2
1
1
3
2
1
2
1
3
1
3
1
1
2
1
1
1
1
2
3
1
2
1
4
3
1
1
1
1
1
1
1
1440
24823
25850
45529
1262
1279
1718
9866
1115
1510
2537
1766
3940
1002
2572
1104
1101
12854
1447
1510
3635
1000
1997
1499
1247
2557
1402
2554
1068
1155
13286
1849
2602
2072
5158
1511
1383
GROSS
WT IN
215.0
215.6
216 .
217.
221.
222 .
220 .
218 .
218.6
214.1
225 ,
214 .
218 .
216 .
222 .
222 ,
214 .
221 .
218 ,
218.
212 ,
216.6
221.6
220.1
210.8
221.7
222.8
224.0
222.9
216.0
222.2
226.4
224.5
218.5
220.4
220.0
216.1
RADON ± LLD
pCi/m2s pCi/m2 s pCi/m2s COMMENTS:
. 5
.7
.7
.6
.3
.5
. 5
.7
,5
. 9
.2
. 1
.3
.3
.9
.1
.2
. 0
. 7
.4
.3
.9
. 9
1.
44 .
46 .
82 .
0.
0 .
2.7
17.1
0. 4
1.1
4 .
1.
6.
0 .
4 ,
0.
1.7
22.3
1.0
2.4
6.1
1,
.2
.3
.7
. 3
.3
.4
3
1
0
4
1
4
0
0
23
3
0.03
0.03
0.0
0.4
0.0
0.0
2.3
03
03
03
03
4.4
3.5
9.0
2.4
2.2
0.3
0.9
0.2
0.2
0.03
0.03
0.03
0.03
0.03
0.03
0.03
0.03
0.03
0.03
0.03
0.03
0.03
0.03
0.03
0.03
0.03
0.03
0.03
0.03
0.03
0.03
0.03
0.03
0.03
0,
0,
0.03
0.03
0.
0.
03
03
03
03
Page 2 of 3
CLIENT: ENERGY FUELS RESOURCES PROJECT: RADON FLUX MEASUREMENTS, WHITE MESA MILL PROJECT NO.: 15004.02
PILE: 3 BATCH: E SURFACE: SOIL AIR TEMP MIN: 43°F WEATHER: CLEAR, NO RAIN
AREA: COVER DEPLOYED: 5 12 15 RETRIEVED: 5 13 15 CHARCOAL BKG: 149 cpm Wt. Out: 180.0 g.
FIELD TECHNICIANS: CE.DLC, CS, TE COUNTED BY: DLC DATA ENTRY BY: DLC TARE WEIGHT: 29.2 g.
COUNTING SYSTEM I.D.: M01/D21, M02/D20 CAL. DUE: 6/27/15
LOCATION
E75
E76
E77
E78
E79
E80
E81
E82
E83
E84
E85
E86
E87
E88
E89
E90
E91
E92
E93
E94
E95
E96
E97
E98
E99
ElOO
SAMPLE
E75
E76
E77
E78
E79
E80
E81
E82
E83
E84
E85
E86
E87
E88
E89
E90
E91
E92
E93
E94
E95
E96
E97
E98
E99
ElOO
DEPLOY RETRIV ANALYSIS MID-TIME CNT GROSS GROSS RADON + LLD
HR MIN HR MIN MO DA YR HR MIN (MIN) COUNTS WT IN pCi/m2 s pCi/m2 s pCi/m2s COMMENTS:
11 11 10
11 14 10
10 44 10
10 47 10
10 50 10
10 53 10
10 56 10
10 59 10
11 2 10
11 5 10
11 8 10
11 11 10
11 17 10
11 17 10
11 20 10
11 20 11
11 23 11
11 23 11
11 26 11
11 26 11
11 29 11
11 29 11
11 35 11
11 37 11
11 39 11
11 41 11
55
57
42
43
45
46
48
49
51
52
54
56
58
59
59
1
1
2
2
4
4
6
7
6
5
2
5
5
5
5
5
5
5
5
5
5
5
5
5
5
5
5
5
5
5
5
5
5
5
5
5
5
14 15
14 15
14 15
14 15
14 15
14 15
14 15
14 15
14 15
14 15
14 15
14 15
14 15
14 15
14 15
14 15
14 15
14 15
14 15
14 15
14 15
14 15
14 15
14 15
14 15
14 15
17
17
17
17
17
17
17
17
17
17
17
17
17
17
17
17
17
17
17
17
17
17
17
17
17
17
10
10
11
11
12
12
14
14
16
16
18
18
21
20
24
25
27
27
28
28
30
30
33
32
36
36
1 1724
1 1501
1 1110
1 3281
1 2523
1 3175
2 1223
2 1268
1 7085
1 22847
2 1003
1 1515
4 1221
1 10411
1 1856
2 1364
1 1200
1 1535
1 7847
1 3878
1 1098
1 2967
4 1047
2 1254
1 2340
1 6546
214.8
225.1
218.
219.
220 .
218 .
215.8
213.7
223.1
218.8
216.0
212.7
215.9
221.0
215.0
223.3
216 .
221 ,
224 .
216.4
222.8
212.0
216.8
218.8
215.1
218.6
. 1
.4
.0
2
2
1
5
4
5
0
0
12
40
0
2
0
18
3
1
1
2
14.0
6.7
1
5
0
0
4
11
.7
. 1
.2
.9
.0
. 7
0.3
0.2
0.2
0.6
0.2
0.0
03
03
03
03
03
03
03
03
03
03
03
03
0.03
0.03
0.03
0.03
0.03
0.03
0.03
0.03
0.03
0.03
0.03
0.03
0.03
0.03
AVERAGE RADON FLUX RATE FOR THE CELL 3 COVER REGION:7.4 pCi/m2s
BLANK CANISTER ANALYSIS:
0.2
85.5
MIN
MAX
SAMPLE RETRIV ANALYSIS MID-TIME GROSS GROSS RADON
LOCATION
E BLANK 1
E BLANK 2
E BLANK 3
E BLANK 4
E BLANK 5
HR MIN HR MIN MO DA YR HR MIN (MIN) COUNTS WT IN pCi/m2s pCi/m2 s pCi/m2 s COMMENTS:
E BLANK 1 9 45 10 15 5 14 15 10 41 10 1586 207.8 0.02 0.02 0.03 CONTROL
E BLANK 2 9 45 10 15 5 14 15 10 41 10 1561 208.5 0.01 0.02 0.03 CONTROL
E BLANK 3 9 45 10 15 5 14 15 10 52 10 1582 208.1 0.02 0.02 0.03 CONTROL
E BLANK 4 9 45 10 15 5 14 15 10 52 10 1740 209.9 0.04 0.02 0.03 CONTROL
E BLANK 5 9 45 10 15 5 14 15 11 3 10 1573 209.1 0.01 0.02 0.03 CONTROL
AVERAGE BLANK CANISTER ANALYSIS FOR THE CELL 3 COVER REGION:0.02 pCi/m2 s
Paqe 3 of 3
Appendix D
Sample Locations Map (Figure 2)
D
” (C 1
CELL 1
s
♦VC
□
CELL 2
201 E12 El 3
E02 E24
E25 E36E14 BEACHrJ=gionE37E03E23E10E26E99E35E15E98E22E38 E97E04 E54E27E09 E53E16E34 E52E21E39B°UNd ESIc°VerEiEOS E28 a*Ybf°*egi E50E08pilesE65T^EN0 N E33 E49El 7 C°^E64E40r20 BEACH E48E63E06.29 CELL 3 E47E62E07E32 E46E61E66E41E19El 00 E45E60E67E30 E44E59E68E31E58-69E42 E57E70pilesE77E43 E56E71E78C0'/£/?££>E55E72E79UQUin**gion E73E80 E74E81E96 E75E82E95 E76E83E94E84E93ESSE92E86E91E90t89E88E87
CELL 4B
CELL4A
WHITE MESA MILL
BLANDING. UTAH
NESHAPS 2015
CELL 3
MAY 2015 SAMPLING
05/11/15-05/13/15
PREPARED FOR
ENERGY FUELS RESOURCES
LEGEND
D01 • - SAMPLE LOCATION ON
BEACH AREAS
E01 O ' SAMPLE LOCATION ON
COVERED AREAS
FIGURE 2
yvi
SCALE IN FEET
200 100 0 200 400
TEUCO
ENVIRONMENTAL, LLC
THIS DRAWING IS THE PROPERTY OF TELLCO
ENVIRONMENTAL, LLC, AND IS NOTTO BE
REPRODUCED, MODIFIED OR USED FOR ANY
OTHER PROJECT OR EXTENSION OF THIS PROJECT
EXCEPT BY AGREEMENT WITH TELLCO.
ATTACHMENT 3
Tellco Report for Radon Flux Monitoring
July 2015
National Emission Standards for Hazardous Air Pollutants
2015 Radon Flux Measurement Program
White Mesa Mill
6425 South Highway 191
Blanding, Utah 84511
3rd Quarter 2015 Sampling Results
Cell 3
Prepared for: Energy Fuels Resources (USA) Inc.
6425 S. Highway 191
P.O. Box 809
Blanding, Utah 84511
Prepared by: Tellco Environmental
P.O. Box 3987
Grand Junction, Colorado 81502
TABLE OF CONTENTS
Page
1. INTRODUCTION....................................................................................................................................................1
2. SITE DESCRIPTION..............................................................................................................................................1
3. REGULATORY REQUIREMENTS FOR THE SITE..................................................................................1
4. SAMPLING METHODOLOGY.........................................................................................................................2
5. FIELD OPERATIONS...........................................................................................................................................2
5.1 Equipment Preparation...........................................................................................................................2
5.2 Sample Locations, Identification, and Placement.........................................................................3
5.3 Sample Retrieval.....................................................................................................................................3
5.4 Environmental Conditions...................................................................................................................4
6. SAMPLE ANALYSIS............................................................................................................................................4
6.1 Apparatus...................................................................................................................................................4
6.2 Sample Inspection and Documentation............................................................................................4
6.3 Background and Sample Counting.....................................................................................................4
7. QUALITY CONTROL (QC) AND DATA VALIDATION.......................................................................5
7.1 Sensitivity..................................................................................................................................................5
7.2 Precision......................................................................................................................................................5
7.3 Accuracy.....................................................................................................................................................6
7.4 Completeness............................................................................................................................................6
8. CALCULATIONS....................................................................................................................................................6
9. RESULTS...................................................................................................................................................................7
9.1 Mean Radon Flux.....................................................................................................................................7
9.2 Site Results.................................................................................................................................................8
References......................................................................................................................................................................9
Figure 1......................................................................................................................................................................... 10
Appendix A. Charcoal Canister Analyses Support Documents
Appendix B. Recount Data Analyses
Appendix C. Radon Flux Sample Laboratoiy Data, Including Blanks
Appendix D. Sample Locations Map (Figure 2)
1.INTRODUCTION
During July 21-23, 2015 Tellco Environmental, LLC (Tellco) of Grand Junction, Colorado, provided
support to Energy Fuels Resources (USA) Inc. (Energy Fuels) to conduct radon flux measurements at
its White Mesa Mill site regarding the required National Emission Standards for Hazardous Air
Pollutants (NESHAPs) Radon Flux Measurements. These measurements are required of Energy Fuels
to show compliance with Federal Regulations (further discussed in Section 3 below). The standard is
not an average per facility, but is an average per radon source. The standard allows mill owners or
operators the option of either making a single set of measurements or making measurements over a
one year period (e.g., weekly, monthly, or quarterly intervals). For the calendar year 2015, Energy
Fuels is conducting the radon flux measurements for Cell 3 at quarterly intervals.
Tellco was contracted to provide radon canisters, equipment and canister placement personnel, as well
as lab analysis of samples. Energy Fuels personnel provided support for loading and unloading
charcoal from the canisters. This report details the procedures employed by Energy Fuels and Tellco
to obtain the results presented in Section 9.0 of this report. This report presents the 3rd Quarter 2015
results of the radon flux measurements for Cell 3 only; the results of radon flux measurements
performed during July 2015 for Cell 2 are presented in a separate report.
2. SITE DESCRIPTION
The White Mesa Mill facility is located in San Juan County in southeastern Utah, six miles south of
Blanding, Utah. The mill began operations in 1980 for the purpose of extracting uranium and
vanadium from feed stocks. Processing effluents from the operation are deposited in lined cells,
which vary in depth. Cell 1, Cell 4A, and Cell 4B did not require radon flux sampling, as explained in
Section 3 below.
Cell 2 has a total area of approximately 270,624 square meters (m2) and is comprised of one region
which requires NESHAPs radon flux monitoring. Cell 2 has been filled and covered with interim soil
cover of varying thickness and there are no exposed tailings beaches or standing liquid within Cell 2.
Cell 3 is nearly filled with tailings sand and is undergoing pre-closure activities. At the time of the
July 2015 sampling, this cell had a total area of 288,858 m2 and was comprised of two source regions
that require NESHAPs radon flux monitoring: approximately 253,479 m2 of interim soil cover of
varying thickness and approximately 26,745 nr of exposed tailings beaches. The remaining
approximately 8,634 m2 was covered by standing liquid in lower elevation areas.
3. REGULATORY REQUIREMENTS FOR THE SITE
Radon emissions from the uranium mill tailings at this site are regulated by the State of Utah’s
Division of Radiation Control and administered by the Utah Division of Air Quality under generally
applicable standards set by the Environmental Protection Agency (EPA) for Operating Mills.
Applicable regulations are specified in 40 CFR Part 61, Subpart W, National Emission Standards for
Radon Emissions from Operating Mill Tailings, with technical procedures in Appendix B. At present,
there are no Subpart T uranium mill tailings at this site. These regulations are a subset of the
NESHAPs. According to subsection 61.252 Standard, (a) radon-222 emissions to ambient air from an
l
existing uranium mill tailings pile shall not exceed an average of 20 pCi/m2-s for each pile, or cell.
Subsection 61.253, Determining Compliance, states that: "Compliance with the emission standard in
this subpart shall be determined annually through the use of Method 115 of Appendix B." The
repaired Cell 4A, and newly constructed Cell 4B, were both constructed after December 15, 1989
and each was constructed with less than 40 acres surface area. Cell 4A and 4B comply with the
requirements of 40 CFR 61.252(b), therefore no radon flux measurements are required on either
Cell 4A or 4B. Cell 1 is completely covered with standing liquid and therefore no radon flux
measurements are required on Cell 1.
4. SAMPLING METHODOLOGY
Radon emissions were measured using Large Area Activated Charcoal Canisters (canisters) in
conformance with 40 CFR, Part 61, Appendix B, Method 115, Restrictions to Radon Flux
Measurements, (EPA, 2015). These are passive gas adsorption sampling devices used to determine
the flux rate of radon-222 gas from a surface. The canisters were constructed using a 10-inch
diameter PVC end cap containing a bed of 180 grams of activated, granular charcoal. The prepared
charcoal was placed in the canisters on a support grid on top of a !4 inch thick layer of foam and
secured with a retaining ring under 114 inches of foam (see Figure 1, page 11).
Two hundred sampling locations were distributed throughout Cell 3 (comprised of two source regions
requiring monitoring) as depicted on the Sample Locations Map (see Figure 2, Appendix D). Each
charged canister was placed directly onto the surface (open face down) and exposed to the surface for
24 hours. Radon gas adsorbed onto the charcoal and the subsequent radioactive decay of the
entrained radon resulted in radioactive lead-214 and bismuth-214. These radon progeny isotopes emit
characteristic gamma photons that can be detected through gamma spectroscopy. The original total
activity of the adsorbed radon was calculated from these gamma ray measurements using calibration
factors derived from cross-calibration of standard sources containing known total activities of
radium-226 with geometry identical to the counted samples and from the principles of radioactive
decay.
After approximately 24 hours, the exposed charcoal was transferred to a sealed plastic sample
container (to prevent radon loss and/or further exposure during transport), identified and labeled, and
transported to the Tellco laboratory in Grand Junction, Colorado for analysis. Upon completion of on­
site activities, the field equipment was alpha and beta-gamma scanned for possible contamination
resulting from fieldwork activities. All field equipment was surveyed by Energy Fuels Radiation
Safety personnel and released for unrestricted use. Tellco personnel maintained custody of the
samples from collection through analysis.
5. FIELD OPERATIONS
5.1 Equipment Preparation
All charcoal was dried at 110°C before use in the field. Unused charcoal and recycled charcoal were
treated the same. 180-gram aliquots of dried charcoal were weighed and placed in sample containers.
Proper balance operation was verified daily by checking a standard weight. The balance readout
agreed with the known standard weight to within ±0.1 percent.
2
After acceptable balance check, empty containers were individually placed on the balance and the
scale was re-zeroed with the container on the balance. Unexposed and dried charcoal was carefully
added to the container until the readout registered 180 grams. The lid was immediately placed on the
container and sealed with plastic tape. The balance was checked for readout drift between readings.
Sealed containers with unexposed charcoal were placed individually in the shielded counting well,
with the bottom of the container centered over the detector, and the background count rate was
documented. Three five-minute background counts were conducted on ten percent of the containers,
selected at random to represent the "batch". If the background counts were too high to achieve an
acceptable lower limit of detection (LLD), the entire charcoal batch was labeled non-conforming and
recycled through the heating/drying process.
5.2 Sample Locations, Identification, and Placement
On July 21, 2015, one hundred sampling locations were distributed throughout the Cell 3 covered
region; and on July 22, 2015, one hundred sampling locations were distributed throughout the Cell 3
beaches regions. A sample identification number (ID) was assigned to every sample point, using a
sequential alphanumeric system indicating the charcoal batch and physical location within the region
(e.g., GO 1...HI00). This ID was written on an adhesive label and affixed to the top of the canister.
The sample ID, date, and time of placement were recorded on the radon flux measurements data
sheets for each one-hundred measurement set.
Prior to placing a canister at each sample location, the retaining ring, screen, and foam pad of each
canister were removed to expose the charcoal support grid. A pre-measured charcoal charge was
selected from a batch, opened and distributed evenly across the support grid. The canister was then
reassembled and placed face down on the surface at each sampling location. Care was exercised not
to push the device into the soil surface. The canister rim was “sealed” to the surface using a berm of
local borrow material.
Five canister blanks were similarly processed for each sample set (ten blanks total) and the canisters
were kept inside an airtight plastic bag during the 24-hour testing period.
5.3 Sample Retrieval
At the end of each of the 24-hour testing periods, the canisters were retrieved, disassembled and each
charcoal sample was individually poured through a funnel into a container. Identification numbers
were transferred to the appropriate container, which was sealed and placed in a box for transport.
Retrieval date and time were recorded on the same data sheets as the sample placement information.
The blank samples were similarly processed. All of the radon flux samples and blanks were
successfully retrieved and containerized during the unloading process.
Tellco personnel maintained custody of the samples from collection through analysis.
3
5.4 Environmental Conditions
A rain gauge and thermometer were placed by Cell 3 to monitor rainfall and air temperatures during
sampling in order to ensure compliance with the regulatory measurement criteria.
In accordance with 40 CFR, Part 61, Appendix B, Method 115:
• Measurements were not initiated within 24 hours of rainfall.
• There was no rainfall during either of the 24-hour sampling periods.
• All of the canister seals remained intact during each of the 24-hour sampling periods.
• The criteria regarding minimum air temperature and frozen ground are not applicable when
performing sampling on a quarterly basis; however, the minimum ambient air temperature
measured during the sampling of Cell 3 was approximately 53° F and the ground was not
frozen.
6. SAMPLE ANALYSIS
6.1 Apparatus
Apparatus used for the analysis:
• Single- or multi-channel pulse height analysis system, Ludlum Model 2200 with a
Teledyne 3" x 3" sodium iodide, thallium-activated (Nal(Tl)) detector.
• Lead shielded counting well approximately 40 cm deep with 5-cm thick lead walls and a 7-
cm thick base and 5 cm thick top.
• National Institute of Standards and Technology (NIST) traceable aqueous solution radium-
226 absorbed onto 180 grams of activated charcoal.
• Ohaus Model C501 balance with 0.1 -gram sensitivity.
6.2 Sample Inspection and Documentation
Once in the laboratory, the integrity of each charcoal container was verified by visual inspection of the
plastic container. Laboratory personnel checked for damaged or unsealed containers and verified that
the data sheet was complete.
No damaged or unsealed containers were observed during inspection at the Tellco analytical
laboratory. All 200 samples and ten blanks were ultimately validated after inspection.
6.3 Background and Sample Counting
The gamma ray counting system was checked daily, including background and radium-226 source
measurements prior to and after each counting session. Based on calibration statistics, using two
sources with known radium-226 content, background and source control limits were established for
each Ludlum/Teledyne counting system with shielded well (see Appendix A).
4
Gamma ray counting of exposed charcoal samples included the following steps:
• The length of count time was determined by the activity of the sample being analyzed,
according to a data quality objective of a minimum of 1,000 accrued counts for any given
sample.
• The sample container was centered on the Nal detector and the shielded well door was
closed.
• The sample was counted over a determined count length and then the mid-sample count
time, date, and gross counts were documented on the radon flux measurements data sheet
and used in the calculations.
• The above steps were repeated for each exposed charcoal sample.
• Approximately 10 percent of the containers counted were selected for recounting. These
containers were recounted within a few days following the original count.
7. QUALITY CONTROL (QC) AND DATA VALIDATION
Charcoal flux measurement QC samples included the following intra-laboratory analytical frequency
objectives:
• Blanks, 5 percent, and
• Recounts, 10 percent
All sample data were subjected to validation protocols that included assessments of sensitivity,
precision, accuracy, and completeness. As described below, all Method 115-required data quality
objectives (EPA, 2015) were attained.
7.1 Sensitivity
A total of ten blanks were analyzed by measuring the radon progeny activity in samples subjected to
all aspects of the measurement process, excepting exposure to the source region. These blank sample
measurements comprised approximately five percent of the field measurements. The results of the
blank sample radon flux rates ranged from 0.01 to 0.03 pCi/m2-s, with an average of approximately
0.02 pCi/m2-s. The lower limit of detection (LLD) was approximately 0.03 pCi/m2-s.
7.2 Precision
Twenty recount measurements, distributed throughout the sample sets, were performed by replicating
analyses of individual field samples (see Appendix B). These recount measurements comprised
approximately 10 percent of the total number of samples analyzed. The precision of recount
measurements, expressed as relative percent difference (RPD), for samples having results above one
(1) pCi/m2-s ranged from less than 0.1 percent to 6.5 percent with an average precision of
approximately 1.6 percent RPD. This complies with the precision objective of 10 percent RPD.
5
7.3 Accuracy
Accuracy of field measurements was assessed daily by counting two laboratory control samples with
known Ra-226 content. Accuracy of these lab control sample measurements, expressed as percent
bias, ranged from approximately -2.0 percent to +2.0 percent. The arithmetic average bias of the lab
control sample measurements was approximately 0.0 percent (see Appendix A). This complies with
the accuracy objective of +/-10 percent bias.
7.4 Completeness
A combined total of 200 samples (100 samples from the Cell 3 beach region and 100 samples from
the Cell 3 cover regions) were verified, representing 100 percent completeness, which complies with
the completeness objective of 85 percent.
8. CALCULATIONS
Radon flux rates were calculated for charcoal collection samples using calibration factors derived
from cross-calibration to sources with known total activity with identical geometry as the charcoal
containers. A yield efficiency factor was used to calculate the total activity of the sample charcoal
containers. Individual field sample result values presented were not reduced by the results of the field
blank analyses.
In practice, radon flux rates were calculated by a database computer program. The algorithms utilized
by the data base program were as follows:
Equation 8.1:
2 _______n______pCi Rn-222/m sec — ^(<1/91.75^
where:N = net sample count rate, cpm under 220-662 keV peak
Ts = sample duration, seconds
b = instrument calibration factor, cpm per pCi; values used:
0.1697, for M-01/D-21 and
0.1711, for M-02/D-20
d = decay time, elapsed hours between sample mid-time and count mid-time
A = area of the canister, m2
Equation 8.2:
Error, 2<7 = 2x
Gross Sample, cpm Background Sample,cpm
Sample Count,t,min Background Count,t,min
Net,cpm
x Sample Concentration
6
Equation 8.3:
LLD =
2.71+(4.6SySj.)
[Ts*A*b*0.5(d/9^75)]
where: 2.71
4.65
Sb
Ts
b
d
A
= constant
= confidence interval factor
= standard deviation of the background count rate
= sample duration, seconds
= instrument calibration factor, cpm per pCi; values used:
0.1697, for M-01/D-2 land
0.1711, for M-02/D-20
= decay time, elapsed hours between sample mid-time and count mid-time
= area of the canister, m2
9. RESULTS
9.1 Mean Radon Flux
Referencing 40 CFR, Part 61, Subpart W, Appendix B, Method 115 - Monitoring for Radon-222
Emissions, Subsection 2.1.7 - Calculations, "the mean radon flux for each region of the pile and for
the total pile shall be calculated and reported as follows:
(a) The individual radon flux calculations shall be made as provided in Appendix A EPA
86(1). The mean radon flux for each region of the pile shall be calculated by summing all
individual flux measurements for the region and dividing by the total number of flux
measurements for the region.
(b) The mean radon flux for the total uranium mill tailings pile shall be calculated as follows:
Js =
JjAj + ... J?A? T+1... J.Ai
At
Where: Js = Mean flux for the total pile (pCi/m2-s)
Ji = Mean flux measured in region i (pCi/m2-s)
Aj = Area of region i (m2)
At = Total area of the pile (m2)”
40 CFR 61, Subpart W, Appendix B, Method 115, Subsection 2.1.8, Reporting states “The results of
individual flux measurements, the approximate locations on the pile, and the mean radon flux for each
region and the mean radon flux for the total stack [pile] shall be included in the emission test report. Any
condition or unusual event that occurred during the measurements that could significantly affect the results
should be reported."
7
9.2 Site Results
Site Specific Sample Results (reference Appendix C)
(a) The mean radon flux for each region within Cell 3 is as follows:
Cell 3 - Beaches Region = 52.4 pCi/m2-s (based on 26,745 m2 area)
Cell 3 - Covered Region = 9.1 pCi/m2-s (based on 253,479 m2 area)
Cell 3 - Water Region = 0.0 pCi/m2-s (based on 8,634 m2 area)
Note: Reference Appendix C of this report for the entire summary of individual measurement results.
(b) Using the data presented above, the calculated mean radon flux rate for Cell 3 is as follows:
Cell 3 = 12.8 pCi/m2-s
r52.4V26.745VK9.1V253.479VK0.0V8.634i =12.8
288,858
As shown above, the arithmetic mean radon flux rate for Cell 3 is below the NRC and EPA standard
of 20 pCi/m2-s. Appendix C is a summary of individual measurement results, including blank sample
analysis.
Sample locations are depicted on Figure 2, which is included in Appendix D. As indicated on Figure
2, there were significant areas of Cell 3 covered with standing water from rainfall events that occurred
during the weeks prior to the July 2015 sampling; however, these rainwater pond areas were not
included with the area of the pre-existing liquor pond for purposes of the calculation of the weighted
average radon flux rate because those rainwater covered areas are considered temporary features. The
map was produced by Tellco.
8
References
U. S. Environmental Protection Agency, Radon Flux Measurements on Gardinier and Royster
Phosphogypsum Piles Near Tampa and Mulberry, Florida, EPA 520/5-85-029, NTIS #PB86-
161874, January 1986.
U. S. Environmental Protection Agency, Title 40, Code of Federal Regulations, July 2015.
U. S. Nuclear Regulatory Commission, Radiological Effluent and Environmental Monitoring at
Uranium Mills, Regulatory Guide 4.14, April 1980.
U. S. Nuclear Regulatory Commission, Title 10, Code of Federal Regulations, Part 40, Appendix A,
January 2015.
9
Figure 1
Large Area Activated Charcoal Canisters Diagram
1 '2'iri Thic* OarctM
Suppo*! pr«]
Handl*l-in. Truck1/4 in. V*nt Hoi*Scrubtom Pad
l/2-ia Thitk &irubddi Pad
1t--
4u m RaiainorSpring
Mj-iii »>
PVC End C*»
F1GUBC 1 Lar^o-Arn Radon Co)factor
10
Appendix A
Charcoal Canister Analyses Support Documents
A
ACCURACY APPRAISAL TABLE
JULY 2015 RADON SAMPLING
ENERGY FUELS RESOURCES
WHITE MESA MILL, BLANDING, UTAH
2015 NESHAPs RADON FLUX MEASUREMENTS
CELL 3
SAMPLING DATES: 07/21/15-07/23/15
SYSTEM
I.D.
COUNT
DATE
Bkg Counts
#1
(1 min. each)
#2 #3
Source Counts (1 min. each)
#1 #2 #3
AVG NET
cpm
YIELD
cpm/pCi
FOUND
pCi
SOURCE
ID
KNOWN
pCi
% BIAS
M-01/D-21 7/23/2015 140 136 142 10296 10253 10299 10143 0.1697 59772 GS-04 59300 0.8%
M-01/D-21 7/23/2015 119 134 117 10482 10283 10291 10229 0.1697 60275 GS-04 59300 1.6%
M-01/D-21 7/24/2015 130 149 120 10222 10247 10454 10175 0.1697 59957 GS-04 59300 1.1%
M-01/D-21 7/24/2015 125 137 124 10321 10383 10466 10261 0.1697 60467 GS-04 59300 2.0%
M-01/D-21 7/25/2015 142 148 122 10505 10218 10315 10209 0.1697 60157 GS-04 59300 1.4%
M-01/D-21 7/25/2015 135 142 137 10092 10437 10385 10167 0.1697 59910 GS-04 59300 1.0%
M-01/D-21 7/23/2015 140 136 142 10066 9891 10137 9892 0.1697 58291 GS-05 59300 -1.7%
M-01/D-21 7/23/2015 119 134 117 10031 10090 10091 9947 0.1697 58617 GS-05 59300 -1.2%
M-01/D-21 7/24/2015 130 149 120 10194 10096 10143 10011 0.1697 58994 GS-05 59300 -0.5%
M-01/D-21 7/24/2015 125 137 124 10115 10259 10176 10055 0.1697 59250 GS-05 59300 -0.1%
M-01/D-21 7/25/2015 142 148 122 10188 10019 10153 9983 0.1697 58825 GS-05 59300 -0.8%
M-01/D-21 7/25/2015 135 142 137 10082 9987 10227 9961 0.1697 58696 GS-05 59300 -1.0%
M-02/D-20 7/23/2015 116 124 119 10296 10466 10414 10272 0.1711 60037 GS-04 59300 1.2%
M-02/D-20 7/23/2015 127 119 118 10250 10396 10485 10256 0.1711 59940 GS-04 59300 1.1%
M-02/D-20 7/24/2015 126 118 128 10324 10310 10350 10204 0.1711 59638 GS-04 59300 0.6%
M-02/D-20 7/24/2015 132 131 126 10304 10270 10398 10194 0.1711 59581 GS-04 59300 0.5%
M-02/D-20 7/25/2015 114 127 137 10395 10220 10568 10268 0.1711 60014 GS-04 59300 1.2%
M-02/D-20 7/25/2015 125 129 122 10275 10362 10305 10189 0.1711 59548 GS-04 59300 0.4%
M-02/D-20 7/23/2015 116 124 119 10185 9972 10025 9941 0.1711 58101 GS-05 59300 -2.0%
M-02/D-20 7/23/2015 127 119 118 10199 10105 10197 10046 0.1711 58712 GS-05 59300 -1.0%
M-02/D-20 7/24/2015 126 118 128 10392 10204 10148 10124 0.1711 59170 GS-05 59300 -0.2%
M-02/D-20 7/24/2015 132 131 126 10307 10223 10117 10086 0.1711 58948 GS-05 59300 -0.6%
M-02/D-20 7/25/2015 114 127 137 10071 10303 10154 10050 0.1711 58738 GS-05 59300 -0.9%
M-02/D-20 7/25/2015 125 129 122 10255 9949 9990 9939 0.1711 58091 GS-05 59300 -2.0%
AVERAGE PERCENT BIAS FOR ALL ANALYTICAL SESSIONS:0.0%
CHARCOAL CANISTER ANALYSIS SYSTEM
SITE LOCATION:. VvJhi^-g Mill, U-hfrti
client: U- n a y Pu ^,1<; R e£c?uir<i<rs f M5/T)
Calibration Check Log
System ID: M-Oi/D * "7- I Calibration Date: 7/<6/<? Due Date: iliafii*
Scaler S/N:__________S~ I 5~ 1 7, High Voltage: 1 I 3 7 Window: 4.42 Thrshld: 2.20
Detector S/N: _ Source ID/SN: R /Czfb~0^f&ource Activity: -S'9»3K p C»
Blank Canister Bkgd. Range, cpm: 2 o = _ <37- to l 30= ~7 4 to I8(p
Gross Source Range, cpm: 2o = . ^^iS'to IOS3-9 30= C)7(^l to I 01*5^
Technician:
All counts times are one minute.
Date
i
By Background Counts (1 min, each)
#1
1 4 0
#2
Lid
13
\4
#3 Avg.#1
Source Counts (1 min, each)
#2 #3 Avera
ok?
Y/N
2H
147-<34 ID^)C6 10^3 IQ 7,49 107.
1°)Cl 130
17-9LC
\>Zt
173 loiisa _i02Jal
7 iOH^4 1 Q3QB^4/133 tnTT-7-1 02-H-
1^-4 j_7a
JlS^c
13B
gm
lOTI &
JJ23
iLbrSj.*7--^ 13 K^3«5\
HS15.J_0
7/79/tS-13?mi.10047,10437 O3o^y
Y/N: Y = average background and source cpm falls within the control limits.
N = average background and source cpm does not fall within the control limits.
The acceptable ranges were determined from prior background and source check data.
CHARCOAL CANISTER ANALYSIS SYSTEM
SITE LOCATION; \/0 MeSfr ? U4(PI K
CLIENT: fc-ft &<>0 i\ f £
Calibration Check Log
System ID: _ ftV (? I / D ' 7- I Calibration Date; 7/19/lS Due Date: ->/>»/1<*
Scaler S/N: S I S7 3- High Voltage: I ) 3 7 Window: 4.42 Thrshld: 2.20
Detector S/N: ^^33________SourceID/SN: ^Source Activity: 5^*3 K p C-(
Blank Canister Bkgd. Range, cpm: 2cr = _ to l G?~7 3 a= 7 *-/
Gross Source Range, cpm: 2o= ^875 to tOSlO 3o=
Technician:
to 1
to
All counts times are one minute.
Date
2/231) IS
By Background Counts (1 min.
#1 #2 #3
each)
Avg.#1
l OQ(a(^
Source Counts (1 min, each)
#2 #3 Average
ok?
Y/N
pU.
sM
JdO I 4-3-t£>Q3i
7/*37 t
7/3-*f/>g
1 1 134 JXL 003 1 |0040 |OQ°) )1007,/
m
XyUL 130 jjda > -iq
H3£
133 10104
TO 115
l OOoii IP'^T 41 h-H It'S-PLL-_122 13.9 IQ-3-g IQ iOl 83
vu~) M~Z-l iciee JP153 >01^0 X-
KlsrliK VUL- 13S .147,122 loofto.IOZT-J iooq<?
Y/N: Y = average background and source cpm falls within the control limits.
N = average background and source cpm does not fall within the control limits.
The acceptable ranges were determined from prior background and source check data.
CHARCOAL CANISTER ANALYSIS SYSTEM
I: WWi+-e WA\, r*>\a.v\A'iny jCl+aU
SITE LOCATION— ——1——;-------------------------------1—" ~ ------------zm-------—CLIENT: tl. -6-iTey y/ FlAtls K g-SC? CC £ ^.U5 A j
System ID:
Scaler S/N:
Calibration Check Log
~ 0 P- J D * Calibration Date: ~7 f \ ^> j I 5~ Due Date: 7 f l j I Lfi
3 window: 4.42 Thrshld: 2.205lS(/3
H/S ?>?k
High Voltage:________ ______ _______
Detector S/N:^ ^ ___Source ID/SN: R ^ /Cs^i Source Activity: 5^*^ K ‘
Blank Canister Bkgd. Range, cpm: 2o=___^ O to 1 S Co 3 a = ~7 ^ to ) ~7 3
2a= to lOG,883q= <37)4 to 10083Gross Source Range, cpm:
Technician:
All counts times are one minute.
Date
r/Pil'is
By
34-
Background Counts (1 min, each)
#1
n£
#2 #3 Avg.lOz# <*
Source Counts (1 min, each)
#2lp4(» (tf~#3 Average1039a
ok?Y/N
12=0.w6)
jjS
11
i oa.6~o i OWL io46:>1Q377 X
lfrHhS*
iMfft
fO^-2-4 103/0 1Q3>so _P3?-g
7/y57/5
\3-^I2lL IPA*\~*>o t P \C-3~1C lOW I 03:* 4
i 034 4
1Q3>4
S
ii H-i?7 Ioa-7-O X
APS ill AOS kQ2.-7<i03>fc-a-L03>o5~X
Y/N: Y = average background and source cpm falls within the control limits.
N = average background and source cpm does not fall within the control limits.
The acceptable ranges were determined from prior background and source check data.
CHARCOAL CANISTER ANALYSIS SYSTEM
SITE LOCATION:. VO k rl-c. KWsfli M i') j 1^> lo to i n g ; U-f ^ k
client: £.r>e^y F\a€\s
Calibration Check Log
System ID: N\ * ^ f P ~ *2- P Calibration Date: ~7 j ! j I 5~ Due Date: ~^/ / < (^
Scaler S/N:_____5 J S ^ High Voltage: 8 C> ^ Window: 4.42 Thrshld: 2.20
Detector S/N:_____^ ^ ^ Source ID/SN:P^___/Cf^> Source Activity: K^^-i
Blank Canister Bkgd. Range, cpm: 2 a = ___to t S' 3 o =
Gross Source Range, cpm: 2c= to I ^5 ^ P 3 o =
Technician:
~7H
°H3 e
to
to
<~7 3
I C?~737
All counts times are one minute.
Date
7/2.y/rV2rHl\
iMU%>
'I/2.SV/T
•?/>s//sr
By Background Counts (1 min, each)
#1
u u>
1 ~2_ C»
L32=•UX
I T-5
#2
Hi
1~T7
#3no>
nfr
i3=k.
J32.
17-^-
Avg.f3-1?
ToT
To*T
J3*2.
13-k
M
#i
rcq><7)X-l
l <3^07
tOoil
i pass
Source Counts (I min, each)
#2
rp
rc^n?io5
IQ'to
l Q-2.-V
i
>0 30^
#3
ICQ2&
tO 11-7
10iS<4
&\0)Q) O
Average\OOOf I
OHsl
l 0X4 fe
1-0:2-1U
ion(<
OOtfeg
ok?
Y/NX
X
2
X
Y/N: Y = average background and source cpm falls within the control limits.
N = average background and source cpm does not fall within the control limits.
The acceptable ranges were determined from prior background and source check data.
BALANCE OPERATION DAILY CHECK
Balance Model: OhftiAS ]?C)f SAJ f \'2-3c>~1
Standard Weight (ol: ^>Q&,Q ^
Date Pre-check (g)Post-check (g)O.K. + 0.1 % ?By
7/2-3 A 5 300.0 3 00. o £
-7 tubs -*>00,0 ^99-9 ^ s
7 /20 /1 ^7>oo-o 3 00,0
Appendix B
Recount Data Analyses
B
CLIENT: ENERGY FUELS RESOURCES PROJECT: RADON FLUX MEASUREMENTS, WHITE MESA MILL PROJECT NO.: 15004.03
PILE: 3 BATCH: G SURFACE: SOIL
AREA: COVER DEPLOYED: 7 21 15 RETRIEVED: 7
FIELD TECHNICIANS: CE,DLC, WM, TE COUNTED BY: DLC
COUNTING SYSTEM I.D.: M01/D21, M02/D20 CAL. DUE: 7/18/16
AIR TEMP MIN: 54°F
22 15 CHARCOALBKG:
DATA ENTRY BY: DLC
WEATHER: CLEAR, NO RAIN
140 cpm Wt. Out: 180.0 g.
TARE WEIGHT: 29.2 g.
RECOUNT CANISTER ANALYSIS:
LOCATION
GIO
RECOUNT
G2 0
RECOUNT
G30
RECOUNT
G40
RECOUNT
G6 0
RECOUNT
G70
RECOUNT
G80
RECOUNT
G90
RECOUNT
GlOO
RECOUNT
SAMPLE
GIO
GIO
G2 0
G2 0
G30
G3 0
G40
G40
G60
G60
G70
G70
G80
G80
G90
G90
GlOO
GlOO
RETRIV ANALYSIS MID-TIME CNT GROSS GROSS RADON ± LLD PRECISION
HR MIN HR MIN MO DA YR HR MIN (MIN) COUNTS WT IN pCi/m2s pCi/m2 s pCi/m2 s % RPD
8 34 8 36 7 24 15 10 58 5 1180 231.5 0.2 0.0 0.04
8 34 8 36 7 25 15 9 25 4 1002 231.5 0.3 0.1 0.04
8
8
9
9
9
9
54
54
14
14
34
34
46
46
54
54
59
59
7 24 15 11 21
7 25 15 9 25
7 24 15 11 40
7 25 15 9 32
24 15 11
25 15 9
54
28
3
3
5
5
1
1
1257
1022
1191
1105
38269
32235
234.7
234.7
238.0
238.0
229.3
229.3
0.6
0.5
0.2
0.2
80.7
79.9
8
8
8
8
8
8
9
9
9
9
27
27
57
57
54
54
24
24
40
40
27
27
46
46
45
45
58
58
2
2
7 24 15 12 19
7 25 15 9 42
7 24 15 12 36
7 25 15 9 45
7 24 15 12
7 25 15 9
7
7
7
7
24 15 12
25 15 9
24
25
15
15
13
9
45
45
57
48
10
47
2
2
1
1
1
1
1
2
1
1
1800 235.9
1530 235.9
2466
2102
229.4
229.4
7366 233.1
6249 233.1
1151
1949
2596
2119
231.6
231.6
228.3
228.3
1.6
1.5
4.9
4.9
15.2
15.0
2.1
2.1
5.2
4.9
0.1
0.1
0.0
0.0
8.1
8.0
0.2
0.2
0.5
0.5
0.2
0.2
0.5
0.5
0.04
0.04
0.04
0.04
0.04
0.04
G50 G50 8 30 8 28 7 24 15 12 10 1 31474 240.1 65.3 6.5 0.04
RECOUNT G50 8 30 8 28 7 25 15 9 41 1 26683 240.1 65.6 6.6 0.04
0.04
0.04
0.04
0.04
1.5 0.04
1.5 0.04
0.04
0.04
0.04
0.04
40.0%
18.2%
0.0%
1.01
0.5%
6.51
0.0%
1.3%
0.0%
5.9%
AVERAGE PERCENT PRECISION FOR THE CELL 3 COVER REGION:7.3%
Page 1 of 1
CLIENT: ENERGY FUELS RESOURCES PROJECT: RADON FLUX MEASUREMENTS, WHITE MESA MILL PROJECT NO.: 15004.03
PILE: 3 BATCH: H SURFACE: TAILINGS
22AREA: BEACHES DEPLOYED: 7
FIELD TECHNICIANS: CE.DLC, WM, TE
COUNTING SYSTEM I.D.: M01/D21, M02/D20
15 RETRIEVED: 7
COUNTED BY: DLC
CAL. DUE: 7/18/16
AIR TEMP MIN: 53°F
23 15 CHARCOALBKG:
DATA ENTRY BY: DLC
WEATHER: CLEAR, NO RAIN
143 cpm Wt. Out: 180.0 g.
TARE WEIGHT: 29.2 g.
RECOUNT CANISTER ANALYSIS:
LOCATION
H10
RECOUNT
H2 0
RECOUNT
H30
RECOUNT
H4 0
RECOUNT
H50
RECOUNT
H60
RECOUNT
H70
RECOUNT
H80
RECOUNT
H90
RECOUNT
HlOO
RECOUNT
SAMPLE
HIO
H10
H2 0
H2 0
H30
H30
H40
H40
H50
H50
H60
H60
H70
H70
H80
H80
H90
H90
HlOO
HlOO
RETRIV ANALYSIS
HR MIN HR MIN MO DA YI
MID-TIME CNT GROSS
HR MIN (MIN) COUNTS
52 10
52 10
9 51 10
9 51 10
10
10
10
10
10 36 10
10 36 10
10 51 10
10 51 10
5
5
59 10 10
59 10 10
2
2
7
7
10 21 10 12
10 21 10 12
10 20 10 22
10 20 10 22
10 27 10 27
10 27 10 27
7
7
17
17
7 23 15 20 36
7 25 15 8 44
7 23 15 20 43
7 25 15 8 44
7 23 15 20 51
7 25 15 8 46
7 23 15 21 0
7 25 15 8 46
7 23 15 21 8
7 25 15 8 47
7 23 15 21 15
7 25 15 8 47
7 23 15 21 23
7 25 15 8 49
7 23 15
7 25 15
21
8
31
49
7 23 15 21 38
7 25 15 8 51
10 38 10 18
10 38 10 18
23
25
15
15
21
8
46
51
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
48587
36579
5076
3902
7722
5938
27799
20717
57043
43151
18410
13835
8378
6277
157286
118959
140944
107326
2222
1686
GROSS
WT IN
232.0
232.0
232.6
232.6
230.8
230.8
227.6
227.6
231.7
231.7
232.8
232.8
234.2
234.2
229.5
229.5
226.0
226.0
229.9
229.9
RADON + LLD
pCi/m2s pCi/m2 s pCi/m2s
73.3
73.0
7.5
7.5
11,
11
42
41
87.5
87.3
27.9
27.3
12.6
12.4
245.7
242.5
220.8
221.1
3.2
3.1
7.3
7.3
0.8
0.8
1.2
1.2
4.2
4.1
8.8
8.7
2.8
2.7
1.3
1.2
24.6
24.3
22.1
22.1
0.3
0.3
0.03
0.04
0.03
0.04
0.03
0.04
0.03
0.04
0.03
0.04
0.03
0.04
0.03
0.04
0.03
0.04
0.03
0.04
0.03
0.04
PRECISION
0.4%
0.01
0.9%
2.61
0.2%
2.21
1.31
0.1%
3.2%
AVERAGE PERCENT PRECISION FOR THE CELL 3 BEACHES REGION:1.31
Appendix C
Radon Flux Sample Laboratory Data (including Blanks)
CLIENT: ENERGY FUELS RESOURCES PROJECT: RADON FLUX MEASUREMENTS, WHITE MESA MILL PROJECT NO.: 15004.03
PILE: 3 BATCH: G SURFACE: SOIL AIR TEMP MIN: 54°F WEATHER: CLEAR, NO RAIN
AREA: COVER DEPLOYED: 7 21 15 RETRIEVED: 7 22 15 CHARCOAL BKG: 140 cpm Wt. Out: 180.0 g.
FIELD TECHNICIANS: CE,DLC, WM, TE COUNTED BY: DLC DATA ENTRY BY: DLC TARE WEIGHT: 29.2 g.
COUNTING SYSTEM I.D.: M01/D21, M02/D20 CAL DUE: 7/18/16
GRID SAMPLE DEPLOY RETRIV ANALYSIS MID-TIME CNT GROSS GROSS RADON ± LLD
LOCATION______I. D. HR MIN HR MIN MO DA YR HR MIN (MIN) COUNTS WT IN pCi/m2s pCi/m2s pCi/m2s COMMENTS:
GOl G01 8 16 8 32 7 24 15 10 40 2 1816 227.5 1.6 0.2 0.04
G02 G02 8 18 8 32 7 24 15 10 40 1 2172 230.6 4.1 0.4 0.04
G03 GO 3 8 20 8 33 7 24 15 10 42 1 2079 228.6 4.0 0.4 0.04
G04 G04 8 22 8 33 7 24 15 10 42 2 1526 234.7 1.3 0.1 0.04
G05 G05 8 24 8 34 7 24 15 10 46 4 1076 231.5 0.3 0.0 0.04
G06 G06 8 26 8 34 7 24 15 10 47 5 1075 226.6 0.2 0.0 0.04
G07 G07 8 28 8 35 7 24 15 10 52 4 1049 229.4 0.3 0.0 0.04
G08 G08 8 30 8 35 7 24 15 10 52 3 1118 232.2 0.5 0.1 0.04
G09 G09 8 32 8 36 7 24 15 10 55 1 5552 227.4 11.2 1.1 0.04
G10 G10 8 34 8 36 7 24 15 10 58 5 1180 231.5 0.2 0.0 0.04
Gil Gil 8 36 8 37 7 24 15 11 1 1 1322 228.8 2.5 0.2 0.04
G12 G12 8 38 8 37 7 24 15 11 3 4 1115 228.8 0.3 0.0 0.04
G13 G13 8 40 8 42 7 24 15 11 6 1 1099 226.1 2.0 0.2 0.04
G14 G14 8 42 8 42 7 24 15 11 8 3 1071 236.1 0.4 0.0 0.04
G15 G15 8 44 8 43 7 24 15 11 12 3 1147 232.0 0.5 0.1 0.04
G16_______ G16______8 46 8 43 7 24 15 11 11 1 1928 238.4_______3.7 0.4 0.04____________________
G17 G17 8 48 8 44 7 24 15 11 15 2 1542 230.8 1.3 0.1 0.04
G18 G18 8 50 8 45 7 24 15 11 17 4 1115 230.1 0.3 0.0 0.04
G19 G19 8 52 8 45 7 24 15 11 22 5 1144 230.3 0.2 0.0 0.04
G20 G20 8 54 8 46 7 24 15 11 21 3 1257 234.7 0.6 0.1 0.04
G21 G21 8 56 8 46 7 24 15 11 26 3 1403 227.6 0.7 0.1 0.04
G22 G22 8 58 8 47 7 24 15 11 26 3 1357 232.2 0.6 0.1 0.04
G23 G23 9 0 8 47 7 24 15 11 29 2 1416 228.1 1.2 0.1 0.04
G24 G24 9 2 8 48 7 24 15 11 29 1 20752 228.9 42.9 4.3 0.04
G25 G25 9 4 8 52 7 24 15 11 31 1 4061 230.7 8.2 0.8 0.04
G26 G26 9 6 8 52 7 24 15 11 31 1 2613 234.6 5.2 0.5 0.04
G27 G27 9 8 8 53 7 24 15 11 33 1 3681 232.5 7.4 0.7 0.04
G28 G28 9 10 8 53 7 24 15 11 35 3 1386 234.4 0.7 0.1 0.04 Offset 20ft W
G29 G29 9 12 8 54 7 24 15 11 38 1 2757 236.8 5.5 0.6 0.04 Offset 40ft W
G3 0 G30 9 14 8 54 7 24 15 11 40 5 1191 238.0 0.2 0.0 0.04
G31 G31 9 16 8 55 7 24 15 11 44 3 1116 236.9 0.5 0.1 0.04
G32 G32 9 18 8 55 7 24 15 11 43 1 48336 234.7 101.1 10.1 0.04
G33 G33 9 20 8 56 7 24 15 11 47 1 1064 234.4 2.0 0.2 0.04
G34 G34 9 22 8 56 7 24 15 11 47 1 1843 232.8 3.6 0.4 0.04
G35 G35 9 24 8 57 7 24 15 11 49 2 1302 233.3 1.1 0.1 0.04
G36 G36 9 26 8 57 7 24 15 11 49 1 1950 225.8 3.8 0.4 0.04
G37 G3 7 9 28 9 25 7 24 15 11 52 2 1049 227.7 0.8 0.1 0.04
Page 1 of 3
CLIENT: ENERGY FUELS RESOURCES PROJECT: RADON FLUX MEASUREMENTS, WHITE MESA MILL
PILE: 3 BATCH: G SURFACE: SOIL
AREA: COVER DEPLOYED: 7 21 15 RETRIEVED: 7
FIELD TECHNICIANS: CE,DLC, WM, TE COUNTED BY: DLC
COUNTING SYSTEM I.D.: M01/D21, M02/D20 CAL. DUE: 7/18/16
AIR TEMP MIN: 54°F
22 15 CHARCOAL BKG:
DATA ENTRY BY: DLC
LOCATION
G38
G3 9
G40
G41
G42
G43
G44
G45
G46
G47
G48
G49
G50
G51
G52
G53
G54
G55
G56
G57
G58
G59
G6 0
G61
G62
G63
G64
G65
G66
G67
G68
G69
G70
G71
G72
G73
G74
SAMPLE DEPLOY RETRIV ANALYSIS MID-TIME CNT GROSS
I. D. HR MIN HR MIN MO DA YR HR MIN (MIN) COUNTS
G3 8
G3 9
G4 0
G41
G42
G43
G44
G45
G46
G47
G48
G49
G50
G51
G52
G53
G54
G55
G56
G57
G58
G59
G60
G61
G62
G63
G64
G65
G66
G67
G68
G69
G70
G71
G72
G73
G74
9
9
9
9
9
9
8
8
8
8
8
8
8
8
8
8
8
8
8
8
8
8
8
8
8
8
8
8
8
8
8
9
9
30
32
34
36
38
40
12
15
18
21
24
27
30
33
36
39
41
12
15
18
21
24
27
30
33
36
39
42
45
48
51
54
57
0
3
8
8
8
9
9
9
8
8
8
8
8
8
8
8
8
8
8
8
8
8
8
8
8
8
8
8
8
8
8
8
8
8
8
8
8
8
58
59
59
0
0
1
22
23
24
25
26
27
28
29
30
31
32
22
23
24
25
26
27
28
29
30
31
32
42
43
44
45
46
47
48
49
50
7
7
7
7
7
7
7
7
T
7
7
7
7
7
7
7
7
7
7
7
7
7
7
7
7
7
7
7
7
7
7
7
7
7
7
7
7
24 15 11
24 15 11
24 15 11
24 15 11
24 15 11
24 15
24 15
24 15 12
24 15 12
24 15
24 15
24 15 12
24 15 12
24 15
24 15
24 15 12
24 15 12
24 15
24 15
24 15 12
24 15 12
24 15 12
24 15 12
24 15 12
24 15 12
24 15
24 15
24 15
12
12
12
12
12
12
12
12
12
12
12
24 15 12
24 15 12
24 15 12
24 15 12
24 15
24 15
24 15 12
24 15 12
24 15 12
12
12
52
54
54
56
58
2
2
5
5
7
7
10
10
12
12
14
14
16
16
17
17
19
19
21
22
25
27
31
31
34
34
36
36
38
38
39
39
1
1
1
1
4
3
1
1
2
1
1
2
1
1
1
2
1
1
1
1
1
2
2
1
3
1
4
3
3
2
1
1
1
1
1
1
1
1019
15033
38269
46129
1196
1380
2403
16164
1121
3970
1148
1550
31474
2581
1359
1467
1884
7577
4353
1119
20051
1778
1800
1145
1001
2972
1233
1163
1077
1208
21151
1911
2466
2223
12390
3236
5585
WEATHER: CLEAR, NO RAIN
140 cpm Wt. Out:
TARE WEIGHT:
PROJECT NO.: 15004.03
180.0
29.2
g.
9-
GROSS RADON + LLD
WT IN pCi/m2 s pCi/m2s pCi/m2s COMMENTS:
226.5
235.3
229.3
228.1
246.5
230.2
235.9
223.2
223.9
228.3
226.5
218.8
240.1
223.5
232.0
232.4
226.7
228.2
229.6
240.3
229.9
225.2
235.9
234.0
237.9
228.3
225.0
237.2
234.7
233.8
237.4
232.9
229.4
226.2
233.9
224.3
227.7
1.9
31.7
80.7
98.2
0.3
0
4
33
0
8.0
2.1
1
65
5
2
1
3
15
8
2.0
41.4
1.6
1.6
2.1
0.4
6.0
0.4
0.5
0.5
1.0
44.0
3.7
4.9
4.4
25.8
6.6
11.5
3.3
0.1
0.8
0.4
1.6
0.9
0.2
4.1
0.2
0.2
0.2
0.0
0.6
0.0
0.1
0.1
0.1
4.4
0.4
0.5
0.4
2.6
0.7
1.1
0.04
0.04
0.04
0.04
0.04
0.04
0.04
0.04
0.04
0.04
0.04
0.04
0.04
0.04
0.04
0.04
0.04
0.04
0.04
0.04
0.04
0.04
0.04
0.04
0.04
0.04
0.04
0.04
0.04
0.04
0.04
0.04
0.04
0.04
0.04
0.04
0.04
ill;
Offset 50ft N
Offset 50ft N
Page 2 of 3
CLIENT: ENERGY FUELS RESOURCES PROJECT: RADON FLUX MEASUREMENTS, WHITE MESA MILL PROJECT NO.: 15004.03
PILE: 3 BATCH: G SURFACE: SOIL
AREA: COVER DEPLOYED: 7 21 15 RETRIEVED: 7
FIELD TECHNICIANS: CE.DLC, WM, TE COUNTED BY: DLC
COUNTING SYSTEM I.D.: M01/D21, M02/D20 CAL. DUE: 7/18/16
AIR TEMP MIN: 54°F
22 15 CHARCOALBKG:
DATA ENTRY BY: DLC
WEATHER: CLEAR, NO RAIN
140 cpm Wt. Out: 180.0 g.
TARE WEIGHT: 29.2 g.
LOCATION
G75
G76
G77
G78
G79
G80
G81
G82
G83
G84
G85
G86
G87
G88
G89
G91
G92
G93
G94
G95
G96
G97
G98
G99
G100
SAMPLE
G75
G76
G77
G78
G79
G80
G81
G82
G83
G84
G85
G86
G87
G88
G89
G90
G91
G92
G93
G94
G95
G96
G97
G98
G99
G100
DEPLOY RETRIV ANALYSIS MID-TIME
HR MIN HR MIN MO DA YR HR MIN
IME CNT GROSS GROSS RADON + LLD
MIN (MIN) COUNTS WT IN pCi/m2s pCi/m2s pCi/m2s COMMENTS:
9
9
8
8
8
8
8
9
9
9
9
9
9
9
9
9
9
9
9
9
9
9
9
9
9
9
12
15
45
48
51
54
57
0
3
6
9
12
15
18
21
24
27
30
33
36
39
42
24
27
30
40
8
8
8
8
8
8
8
8
8
8
8
8
8
8
8
8
8
9
9
9
9
9
9
9
9
9
51
52
42
43
44
45
46
47
48
49
50
51
55
56
57
58
59
0
1
2
3
4
5
5
5
2
7
7
7
7
7
7
7
7
7
7
7
7
7
7
7
7
7
7
7
7
7
7
7
7
7
7
24 15 12
24 15 12
24 15 12
24 15 12
24 15 12
24 15 12
24 15 12
24 15 12
24 15 12
24 15 12
24 15 12
24 15 12
24 15 12
24 15 12
24 15 12
24 15 12
24 15 12
24 15 12
24 15 13
24 15 13
24 15 13
24 15 13
24 15 13
24 15 13
24 15 13
24 15 13
41
41
43
43
45
45
47
47
49
49
51
51
54
53
57
57
59
59
1
1
2
2
5
6
10
10
1
1
2
1
1
1
2
1
1
1
2
2
3
1
2
1
1
1
1
1
1
1
3
5
1
1
2775
2615
1381
7682
4902
7366
1420
1631
6272
14386
1956
1834
1226
1071
1275
1151
1285
2281
1584
6475
2324
5600
1142
1211
3104
2596
230.6
224.0
229.7
236.0
227.6
233.1
236.2
227.9
236.3
229.7
229.9
238.7
226.5
240.0
227.1
231.6
235.9
223.4
228.7
225.0
231.3
218.3
223.9
225.7
227.5
228.3
6
2
,2
0.6
15.8
10.1
15.2
1.2
3.1
13.0
30.0
1.8
1.
0 .
2 .
1.
2 .
0 .
0 .
1,
1.
1.
0.
.6
.6
.0
.1
.1
0.3
1.3
3.0
0.2
0.2
2.5
4.6
. 1
.2
.1
.2
2
. 5
3
13
4 .
11.
0.
0,
6 .
5 ,
0 .
0
0.
0 .
0 .
0 .
0.3
1.4
0.5
1.2
0.1
0.0
0.6
0.5
0.04
0.04
0.04
0.04
0.04
0.04
0.04
0.04
0.04
0.04
0.04
0.04
0.04
0.04
0.04
0.04
0.04
0.04
0.04
0.04
0.04
0.04
04
04
0.04
0.04
AVERAGE RADON FLUX RATE FOR THE CELL 3 COVER REGION:9.1 pCi/m2s
BLANK CANISTER ANALYSIS:
072
101.1
MIN
MAX
SAMPLE
LOCATION
RETRIV ANALYSIS MID-TIME
HR MIN HR MIN MO DA YR HR MIN
IME CNT GROSS GROSS RADON ± LLD
MIN (MIN) COUNTS WT IN pCi/m2s pCi/m2s pCi/m2s COMMENTS:
G BLANK 1 G BLANK 180
G BLANK 2 G BLANK 280
G BLANK 3 G BLANK 380
G BLANK 4 G BLANK 480
G BLANK 5 G BLANK 580
8 25 7 23 15 18 39
8 25 7 23 15 18 39
8 25 7 23 15 18 54
8 25 7 23 15 18 54
8 25 7 23 15 19 10
10
10
10
10
10
1486
1455
1462
1449
1476
213.5
212.2
210.8
210.4
212.7
0.02
0.01
0.01
0.01
0.01
0.02
0.02
0.02
0.02
0.02
0.03
0.03
0.03
0.03
0.03
CONTROL
CONTROL
CONTROL
CONTROL
CONTROL
AVERAGE BLANK CANISTER ANALYSIS FOR THE CELL 3 COVER REGION:0.01 pCi/m2 s
Page 3 of 3
CLIENT: ENERGY FUELS RESOURCES PROJECT: RADON FLUX MEASUREMENTS, WHITE MESA MILL PROJECT NO.: 15004.03
PILE: 3 BATCH: H SURFACE: TAILINGS AIR TEMP MIN: 53°F WEATHER: CLEAR, NO RAIN
AREA: BEACHES DEPLOYED: 7 22 15 RETRIEVED: 7 23 15 CHARCOAL BKG: 143 cpm Wt. Out: 180.0 g.
FIELD TECHNICIANS: CE,DLC,WM,TE COUNTED BY: DLC DATA ENTRY BY: DLC TARE WEIGHT: 29.2 g.
COUNTING SYSTEM I.D.: M01/D21, M02/D20 CAL. DUE: 7/18/16
LOCATION
HO 2
HO 3
H04
H05
H06
H07
H08
HO 9
H10
HI 1
H12
H13
H14
HI 5
H16
H17
H18
HI 9
H2 0
H21
H22
H23
H24
H25
H26
H27
H2 8
H29
H30
H31
H32
H33
H34
H35
H36
H37
SAMPLE DEPLOY RETRIV ANALYSIS MID-TIME CNT GROSS GROSS RADON + LLD
I. D. HR MIN HR MIN MO DA YR HR MIN (MIN) COUNTS WT IN pCi/m2s pCi/m2s pCi/m2s COMMENTS:
HOI
H02
H03
H04
H05
H06
H07
HO 8
H09
H10
HI 1
H12
H13
H14
H15
H16
H17
H18
H19
H2 0
H21
H22
H23
H24
H25
H26
H27
H28
H29
H3 0
H31
H32
H33
H34
H35
H36
H37
9
9
9
9
9
9
9
9
9
9
9
9
9
9
9
9
9
9
9
9
10
10
10
10
10
9
9
9
9
9
9
9
9
9
9
10
10
45
46
47
47
48
49
50
50
51
52
53
53
54
55
56
56
57
58
59
59
0
1
2
2
3
45
46
48
49
51
52
54
55
57
58
0
1
10
10
10
10
10
10
10
10
10
10
10
10
10
10
10
10
10
10
10
10
10
10
10
10
10
10
10
10
10
10
10
10
10
10
10
10
10
0
0
1
1
2
3
3
4
4
5
5
6
6
7
7
8
8
9
9
10
10
11
11
12
12
0
0
1
1
2
2
3
3
4
4
5
5
7
7
7
7
7
7
7
7
7
7
7
7
7
7
7
7
7
7
7
7
7
7
7
7
7
7
7
7
7
7
7
7
7
7
7
7
7
23
23
23
23
23
23
23
23
23
23
23
23
23
23
23
23
23
23
23
23
23
23
23
23
23
23
23
23
23
23
23
23
23
23
23
23
23
15 20
15 20
15 20
15 20
15 20
15 20
15 20
15 20
15 20
15 20
15 20
15 20
15 20
15 20
15 20
15 20
15 20
15 20
15 20
15 20
15 20
15 20
15 20
15 20
15 20
15 20
15 20
15 20
15 20
15 20
15 20
15 20
15 20
15 20
15 20
15 20
15 20
30
30
31
31
33
33
34
34
36
36
37
37
39
39
40
40
42
42
43
43
45
45
46
46
48
48
49
49
51
51
53
53
55
55
57
57
59
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
2
1
1
1
1
1
1
1065
4453
2155
3272
2835
6667
2659
27930
12910
48587
15324
16615
32564
66267
10551
9770
2194
3502
11322
5076
29287
1885
2877
5072
76329
37288
21763
3216
8171
7722
1194
1805
2505
2948
16161
15242
10920
231.8
238.4
234.9
234.8
233.7
234.6
234.8
237.5
237.7
232.0
240.4
228.7
229.5
229.4
236.9
241.1
234.7
242.5
237.0
232.6
237.1
232.3
231.7
235.8
235.0
243.4
236 .
233 .
230 .
230.8
233.7
237.8
232.9
236.5
227.9
230.7
230.1
, 3
. 5
.2
1.4
6.5
3.1
4.7
4.1
9.9
3.8
42.0
19.5
73.3
23.2
24.9
49.5
100.1
15.9
14.6
3.1
5.1
1
5
17
7
44.5
2.6
4.2
7.5
116.5
56.2
33.0
4.7
12.3
11.5
0.7
2.5
3.6
4.3
24.6
23.0
16.6
0 ,
0 .
0 .
0 .
0 .
1.
0 .
4 .
1.
7.3
2.3
. 5
.3
2.5
4.9
10.0
1.6
1
0
0.5
1.7
0.7
4.5
0.3
0.4
0.7
11.7
5.6
3.3
0.5
1.2
1.2
0.1
0.3
0.4
0.4
2.5
2.3
1.7
0.03
0.03
0.03
0.03
0.03
0.03
0.03
0.03
0.03
0.03
0.03
0.03
0.03
0.03
0.03
0.03
0.03
0.03
0.03
0.03
0.03
0.03
0.03
0.03
0.03
0.03
0.03
0.03
0.03
0.03
0.03
0.03
0.03
0.03
0.03
0.03
0.03
Page 1 of 3
CLIENT: ENERGY FUELS RESOURCES PROJECT: RADON FLUX MEASUREMENTS, WHITE MESA MILL PROJECT NO.: 15004.03
PILE: 3 BATCH: H SURFACE: TAILINGS AIR TEMP MIN: 53°F WEATHER: CLEAR, NO RAIN
AREA: BEACHES DEPLOYED: 7 22 15 RETRIEVED: 7 23 15 CHARCOAL BKG: 143 cpm Wt. Out: 180.0 g.
FIELD TECHNICIANS: CE,DLC,WM,TE COUNTED BY: DLC DATA ENTRY BY: DLC TARE WEIGHT: 29.2 g.
COUNTING SYSTEM I.D.: M01/D21, M02/D20 CAL, DUE: 7/18/16
LOCATION
H38
H3 9
H4 0
H41
H42
H43
H44
H45
H46
H47
H48
H49
H50
H51
H52
H53
H54
H55
H56
H57
H58
H59
H60
H61
H62
H63
H64
H65
H66
H67
H68
H69
H70
H71
H72
H73
H74
SAMPLE
H3 8
H3 9
H40
H41
H42
H43
H44
H45
H4 6
H4 7
H4 8
H4 9
H50
H51
H52
H53
H54
H55
H56
H57
H58
H59
H60
H61
H62
H63
H64
H65
H66
H67
H68
H69
H70
H71
H72
H73
H74
DEPLOY RETRIV ANALYSIS MID-TIME CNT GROSS GROSS RADON ± LLD
HR MIN HR MIN MO DA YR HR MIN (MIN) COUNTS WT IN pCi/m2s pCi/m2 s pCi/m2 s COMMENTS:
10
10
10
10
10
10
10
10
10
10
10
10
10
10
10
3
4
6
7
9
10 10
10 12
10
10
10
10
10
10
10
10
13
15
16
18
19
21
13
14
10 15
10 15
16
17
18
10 18
10 19
10 20
10 21
21
22
23
10 24
10 24
25
26
10 27
10 27
28
29
10
10
10
10
10
10
10
10
10
10
10
10
10
10
10
10
10
10
10
10
10
10
10
10
10
10
10
10
10
10
10
10
10
10
10
6
6
7
7
8
8
9
9
10
10
11
11
12
18
18
19
19
20
20
21
21
22
22
23
23
24
24
25
25
26
26
27
27
28
28
10 30
10 30
10 29
10 29
7
7
7
7
7
7
7
7
7
7
7
7
7
7
7
7
7
7
7
7
7
7
7
7
7
7
7
7
7
7
7
7
7
7
7
7
7
23
23
23
23
23
23
23
23
23
23
23
23
23
23
23
23
23
23
23
23
23
23
23
23
23
23
23
23
23
23
23
23
23
23
23
23
23
15 20
15 21
15 21
15 21
15 21
15 21
15 21
15 21
15 21
15 21
15 21
15 21
15 21
15 21
15 21
15 21
15 21
15 21
15 21
15 21
15 21
15 21
15 21
15 21
15 21
15 21
15 21
15 21
15 21
15 21
15 21
15 21
15 21
15 21
15 21
15 21
15 21
59
0
0
2
2
3
3
5
5
6
6
8
8
9
9
11
11
12
12
14
14
15
15
17
17
18
18
20
20
21
21
23
23
24
24
26
26
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
.1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
55220
14404
27799
18189
43280
28272
17372
6007
44281
20310
27035
31087
57043
1289
21122
15333
16399
4616
33457
16850
21750
16710
18410
33673
2923
19672
11715
24092
21088
19843
13041
19598
8378
22673
14115
13289
2639
.7
.3
. 5
.3
.5
,7
. 2
. 2
,0
227.7
227.6
227.6
233 .
232 .
232.0
232.7
231.5
230.1
226 .
234 .
237,
231.
236 ,
234 .
236.
236.1
233.0
235.6
231.5
229.5
232.7
232.8
238.9
229.9
230.8
235.6
235.3
236.8
234.3
234.4
235.9
234.2
234.1
226.1
239.5
231.9
84.0
22.0
42.3
27.8
66.0
43.4
26.4
9.1
67.
31 .
.7
.2
,3
.0
.5
8
41 .
48 .
87 .
1 .
32.0
23.4
24.8
6.9
50.8
25.7
33.0
25.5
27.9
51.6
4
30
17
36
32.0
30.4
19.7
30.0
12.6
34.7
21.4
20.3
3.8
8.4
2.2
4 ,
2.
6.
4 .
2 .
0.
6.8
3.1
4.1
4.8
8.8
0.2
3.2
5.1
2.6
3.3
3.7
3.2
0.03
0.03
0.03
0.03
0.03
03
03
03
03
0.03
0.03
0.03
0.03
0.03
0.03
0.03
0.03
0.03
0.03
0.03
0.03
0.03
0.03
03
03
0.03
0.03
03
03
2.1
2.0
0.4
0.03
0.03
0.03
0.03
0.03
0.03
0.03
0.03
. ' ^
Page 2 of 3
CLIENT: ENERGY FUELS RESOURCES PROJECT: RADON FLUX MEASUREMENTS, WHITE MESA MILL PROJECT NO.: 15004.03
PILE: 3 BATCH: H SURFACE: TAILINGS AIR TEMP MIN: 53°F WEATHER: CLEAR, NO RAIN
AREA: BEACHES DEPLOYED: 7 22 15 RETRIEVED: 7 23 15 CHARCOAL BKG: 143 cpm Wt. Out: 180.0 g.
FIELD TECHNICIANS: CE.DLC, WM, TE COUNTED BY: DLC DATA ENTRY BY: DLC TARE WEIGHT: 29.2 g.
COUNTING SYSTEM I.D.: M01/D21, M02/D20 CAL. DUE: 7/18/16
GRID
LOCATION
H75
H76
H77
H78
H79
H80
H81
H82
H83
H84
H85
H86
H87
H88
H89
H90
H91
H92
H93
H94
H95
H96
H97
H98
H99
HlOO
SAMPLE
I. D.
H75
H76
H77
H78
H79
H80
H81
H82
H83
H84
H85
H86
H87
H88
H89
H90
H91
H92
H93
H94
H95
H96
H97
H98
H99
HlOO
DEPLOY RETRIV ANALYSIS MID-TIME CNT GROSS GROSS RADON ± LLD
HR MIN HR MIN MO DA YR HR MIN (MIN) COUNTS WT IN pCi/m2s pCi/m2s pCi/m2 s COMMENTS:
10
10
10
10
10
10
10
10
31
30
10
10
10 31
10 33
10 34
10 36
10 37
10 39
40
42
10 43
10 45
46
48
10 49
10 51
52
54
10 55
10 43
10 42
10 41
10 40
10 40
39
38
10
10
10
10
10
10
10
10
10
10
10
10
10
10
10
10
10
10
10
10
10
10
10
10
10
10
30
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
20
20
19
19
18
18
7
7
7
7
7
7
7
7
7
7
7
7
7
7
7
7
7
7
7
7
7
7
7
7
7
7
23
23
23
23
23
23
23
23
23
23
23
23
23
23
23
23
23
23
23
23
23
23
23
23
23
23
15
15
15
15
15
15
15
15
15
15
15
15
15
15
15
15
15
15
15
15
15
15
15
15
15
15
21
21
21
21
21
21
21
21
21
21
21
21
21
21
21
21
21
21
21
21
21
21
21
21
21
21
27
27
29
29
31
31
32
32
34
34
35
35
37
37
38
38
40
40
41
41
43
43
44
44
46
46
1
1
1
1
1
1
1
1
1
1
t:
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
114660
117577
43051
122139
72714
157286
22702
19134
67697
172729
48291
103980
114187
67248
169885
140944
105338
141708
120411
92943
38053
8300
2020
8307
1615
2222
227.3
237.9
226.3
226.6
230.9
229.5
230.8
237.4
229.8
228.7
232.4
232.4
231.0
224.6
222.9
226.0
220.7
223.1
224.2
233.8
232.9
228.0
229.5
239.5
229.0
229.9
176.7
183.4
67.6
190.6
114.3
245.7
35.6
29.7
106.6
270.1
76.0
162.6
180.1
105.2
268.2
220.8
166.3
222.1
190.2
144.4
59.5
12.7
2.9
12.7
2.3
3.2
17.7
18.3
6.8
19.1
11.4
24.6
3.6
3.0
10.7
27.0
7.6
16.3
18.0
10.5
26.8
22.1
16.6
22.2
19.0
14.4
5.9
1.3
0.3
1.3
0.2
0.3
0.03
0.03
0.03
0.03
0.03
0.03
0.03
0.03
0.03
0.03
0.03
0.03
0.03
0.03
0.03
0.03
0.03
0.03
03
03
03
0.03
0.03
0.03
0.03
0.03
AVERAGE RADON FLUX RATE FOR THE CELL 3 BEACHES REGION:52.4 pCi/m2s
BLANK CANISTER ANALYSIS:
07
270.1 MAX
GRID
LOCATION
H BLANK 1
H BLANK 2
H BLANK 3
H BLANK 4
SAMPLE RETRIV ANALYSIS MID-TIME CNT GROSS GROSS RADON ± LLD
I. D. HR MIN HR MIN MO DA YR HR MIN (MIN) COUNTS WT IN pCi/m2 s pCi/m2 s pCi/m2 s COMMENTS:
H BLANK 1
H BLANK 2
H BLANK 3
H BLANK 4
9
9
9
9
H BLANK 5 H BLANK 5 9
25
25
25
25
25
9
9
9
9
45
45
45
45
7
7
7
7
23
23
23
23
15 19 28
15 19 28
15 19 41
15 19 41
45 7 23 15 19 55
10
10
10
10
10
1563
1635
1573
1641
1527
211.5
209.1
211.2
211.3
210.5
0.02
0.03
0.02
0.03
0.01
0.02
0.02
0.02
0.02
0.02
0.03
0.03
0.03
0.03
0.03
CONTROL
CONTROL
CONTROL
CONTROL
CONTROL
AVERAGE BLANK CANISTER ANALYSIS FOR THE CELL 3 BEACHES REGION:0.02 pCi/m2 s
Page 3 of 3
Appendix D
Sample Locations Map (Figure 2)
D
c
CELL 1
> i
s
♦ —fCD
□
CELL 2
GO]
G12
G13
G24G02
G25
G36G14 BEACH^Hoing G37G23G03
"ATa.G10 G26 G99
D*EGiqn G35G15 G98G22G38 G97G04 G54G27G09 G53Plus.G34G16 G52G39^ANDihq G51G21G05««8rG28 G50G08G65G33 G49G17G40G64G62G20 G48^chhg G63G29 G61G06 G47CELLG07G?stANdi*AT&G32 G46NGtyATG66G41 G45G19G60G100G67 G44G59G30Go8BOUftG31C°V£Rf G58OARvG690/?£G/0/v G57G42G70G77Neon G56G43G71EfteEAPILESG78 G55OfG72G79G73G80uQUinG74G81G96G75G82G95G76G83G94G84G93
G85G92
G86G91
G90
G89
G88
G87
CELL 4B~
CELL4A
WHITE MESA MILL
BLANDING. UTAH
NESHAPS 2015
CELL 3
JULY 2015 SAMPLING
07/21/15-07/23/15
PREPARED FOR
ENERGY FUELS RESOURCES
LEGEND
H01 • - SAMPLE LOCATION ON BEACH AREAS
G01 O ■ SAMPLE LOCATION ON COVERED AREAS
FIGURE 2
n
i
SCALE IN FEET
200 100 0 200 400
TEUCO
ENVIRONMENTAL, LLC
THIS DRAWING IS THE PROPERTY OFTELLCO
ENVIRONMENTAL, LLC, AND IS NOTTO BE
REPRODUCED, MODIFIED OR USED FOR ANY
OTHER PROJECT OR EXTENSION OF THIS PROJECT
EXCEPT BY AGREEMENT WITH TELLCO.
ATTACHMENT 4
Tellco Report for Radon Flux Monitoring
October 2015
National Emission Standards for Hazardous Air Pollutants
2015 Radon Flux Measurement Program
White Mesa Mill
6425 South Highway 191
Blanding, Utah 84511
4th Quarter 2015 Sampling Results
Cell 3
Prepared for: Energy Fuels Resources (USA) Inc.
6425 S. Highway 191
P.O. Box 809
Blanding, Utah 84511
Prepared by: Tellco Environmental
P.O. Box 3987
Grand Junction, Colorado 81502
TABLE OF CONTENTS
Page
1. INTRODUCTION....................................................................................................................................................1
2. SITE DESCRIPTION..............................................................................................................................................1
3. REGULATORY REQUIREMENTS FOR THE SITE..................................................................................1
4. SAMPLING METHODOLOGY.........................................................................................................................2
5. FIELD OPERATIONS...........................................................................................................................................2
5.1 Equipment Preparation...........................................................................................................................2
5.2 Sample Locations, Identification, and Placement.........................................................................3
5.3 Sample Retrieval.....................................................................................................................................3
5.4 Environmental Conditions...................................................................................................................4
6. SAMPLE ANALYSIS............................................................................................................................................4
6.1 Apparatus...................................................................................................................................................4
6.2 Sample Inspection and Documentation............................................................................................4
6.3 Background and Sample Counting.....................................................................................................4
7. QUALITY CONTROL (QC) AND DATA VALIDATION.......................................................................5
7.1 Sensitivity........................ 5
7.2 Precision......................................................................................................................................................5
7.3 Accuracy.....................................................................................................................................................6
7.4 Completeness............................................................................................................................................6
8. CALCULATIONS...................................................................................................................................................6
9. RESULTS...................................................................................................................................................................7
9.1 Mean Radon Flux.....................................................................................................................................7
9.2 Site Results.................................................................................................................................................8
References........................................................................................................................................................................9
Figure 1..........................................................................................................................................................................10
Appendix A. Charcoal Canister Analyses Support Documents
Appendix B. Recount Data Analyses
Appendix C. Radon Flux Sample Laboratory Data, Including Blanks
Appendix D. Sample Locations Map (Figure 2)
1.INTRODUCTION
During October 12-14, 2015 Tellco Environmental, LLC (Tellco) of Grand Junction, Colorado,
provided support to Energy Fuels Resources (USA) Inc. (Energy Fuels) to conduct radon flux
measurements at its White Mesa Mill site regarding the required National Emission Standards for
Hazardous Air Pollutants (NESHAPs) Radon Flux Measurements. These measurements are required
of Energy Fuels to show compliance with Federal Regulations (further discussed in Section 3 below).
The standard is not an average per facility, but is an average per radon source. The standard allows
mill owners or operators the option of either making a single set of measurements or making
measurements over a one year period (e.g., weekly, monthly, or quarterly intervals). For the calendar
year 2015, Energy Fuels is conducting the radon flux measurements for Cell 3 at quarterly intervals.
Tellco was contracted to provide radon canisters, equipment and canister placement personnel, as well
as lab analysis of samples. Energy Fuels personnel provided support for loading and unloading
charcoal from the canisters. This report details the procedures employed by Energy Fuels and Tellco
to obtain the results presented in Section 9.0 of this report. This report presents the 4th Quarter 2015
results of the radon flux measurements for Cell 3; no radon flux measurements for Cell 2 were
performed during October 2015.
2. SITE DESCRIPTION
The White Mesa Mill facility is located in San Juan County in southeastern Utah, six miles south of
Blanding, Utah. The mill began operations in 1980 for the purpose of extracting uranium and
vanadium from feed stocks. Processing effluents from the operation are deposited in lined cells,
which vary in depth. Cell 1, Cell 4A, and Cell 4B did not require radon flux sampling, as explained in
Section 3 below.
Cell 2 has a total area of approximately 270,624 square meters (m ) and is comprised of one region
which requires NESHAPs radon flux monitoring. Cell 2 has been filled and covered with interim soil
cover of varying thickness and there are no exposed tailings beaches or standing liquid within Cell 2.
Cell 3 is nearly filled with tailings sand and is undergoing pre-closure activities. At the time of the
October 2015 sampling, this cell had a total area of 288,858 m2 and was comprised of two source
regions that require NESHAPs radon flux monitoring: approximately 253,479 m2 of interim soil cover
of varying thickness and approximately 26,745 m2 of exposed tailings beaches. The remaining
approximately 8,634 m2 was covered by standing liquid in lower elevation areas.
3. REGULATORY REQUIREMENTS FOR THE SITE
Radon emissions from the uranium mill tailings at this site are regulated by the State of Utah’s
Division of Radiation Control and administered by the Utah Division of Air Quality under generally
applicable standards set by the Environmental Protection Agency (EPA) for Operating Mills.
Applicable regulations are specified in 40 CFR Part 61, Subpart W, National Emission Standards for
Radon Emissions from Operating Mill Tailings, with technical procedures in Appendix B. At present,
there are no Subpart T uranium mill tailings at this site. These regulations are a subset of the
NESHAPs. According to subsection 61.252 Standard, (a) radon-222 emissions to ambient air from an
l
existing uranium mill tailings pile shall not exceed an average of 20 pCi/m2-s for each pile, or cell.
Subsection 61.253, Determining Compliance, states that: "Compliance with the emission standard in
this subpart shall be determined annually through the use of Method 115 of Appendix B." The
repaired Cell 4A, and newly constructed Cell 4B, were both constructed after December 15, 1989
and each was constructed with less than 40 acres surface area. Cell 4A and 4B comply with the
requirements of 40 CFR 61.252(b), therefore no radon flux measurements are required on either
Cell 4A or 4B. Cell 1 is completely covered with standing liquid and therefore no radon flux
measurements are required on Cell 1.
4. SAMPLING METHODOLOGY
Radon emissions were measured using Large Area Activated Charcoal Canisters (canisters) in
conformance with 40 CFR, Part 61, Appendix B, Method 115, Restrictions to Radon Flux
Measurements, (EPA, 2015). These are passive gas adsorption sampling devices used to determine
the flux rate of radon-222 gas from a surface. The canisters were constructed using a 10-inch
diameter PVC end cap containing a bed of 180 grams of activated, granular charcoal. The prepared
charcoal was placed in the canisters on a support grid on top of a lA inch thick layer of foam and
secured with a retaining ring under 1 !4 inches of foam (see Figure 1, page 11).
Two hundred sampling locations were distributed throughout Cell 3 (comprised of two source regions
requiring monitoring) as depicted on the Sample Locations Map (see Figure 2, Appendix D). Each
charged canister was placed directly onto the surface (open face down) and exposed to the surface for
24 hours. Radon gas adsorbed onto the charcoal and the subsequent radioactive decay of the
entrained radon resulted in radioactive lead-214 and bismuth-214. These radon progeny isotopes emit
characteristic gamma photons that can be detected through gamma spectroscopy. The original total
activity of the adsorbed radon was calculated from these gamma ray measurements using calibration
factors derived from cross-calibration of standard sources containing known total activities of
radium-226 with geometry identical to the counted samples and from the principles of radioactive
decay.
After approximately 24 hours, the exposed charcoal was transferred to a sealed plastic sample
container (to prevent radon loss and/or further exposure during transport), identified and labeled, and
transported to the Tellco laboratory in Grand Junction, Colorado for analysis. Upon completion of on­
site activities, the field equipment was alpha and beta-gamma scanned for possible contamination
resulting from fieldwork activities. All field equipment was surveyed by Energy Fuels Radiation
Safety personnel and released for unrestricted use. Tellco personnel maintained custody of the
samples from collection through analysis.
5. FIELD OPERATIONS
5.1 Equipment Preparation
All charcoal was dried at 110°C before use in the field. Unused charcoal and recycled charcoal were
treated the same. 180-gram aliquots of dried charcoal were weighed and placed in sample containers.
Proper balance operation was verified daily by checking a standard weight. The balance readout
agreed with the known standard weight to within ±0.1 percent.
2
After acceptable balance check, empty containers were individually placed on the balance and the
scale was re-zeroed with the container on the balance. Unexposed and dried charcoal was carefully
added to the container until the readout registered 180 grams. The lid was immediately placed on the
container and sealed with plastic tape. The balance was checked for readout drift between readings.
Sealed containers with unexposed charcoal were placed individually in the shielded counting well,
with the bottom of the container centered over the detector, and the background count rate was
documented. Three five-minute background counts were conducted on ten percent of the containers,
selected at random to represent the "batch". If the background counts were too high to achieve an
acceptable lower limit of detection (LLD), the entire charcoal batch was labeled non-conforming and
recycled through the heating/drying process.
5.2 Sample Locations, Identification, and Placement
On October 12, 2015, one hundred sampling locations were distributed throughout the Cell 3 covered
regions; and on October 13, 2015, one hundred sampling locations were distributed throughout the
Cell 3 beaches region. A sample identification number (ID) was assigned to every sample point, using
a sequential alphanumeric system indicating the charcoal batch and physical location within the
region (e.g., J01...K100). This ID was written on an adhesive label and affixed to the top of the
canister. The sample ID, date, and time of placement were recorded on the radon flux measurements
data sheets for each one-hundred measurement set.
Prior to placing a canister at each sample location, the retaining ring, screen, and foam pad of each
canister were removed to expose the charcoal support grid. A pre-measured charcoal charge was
selected from a batch, opened and distributed evenly across the support grid. The canister was then
reassembled and placed face down on the surface at each sampling location. Care was exercised not
to push the device into the soil surface. The canister rim was “sealed” to the surface using a berm of
local borrow material.
Five canister blanks were similarly processed for each sample set (ten blanks total) and the canisters
were kept inside an airtight plastic bag during the 24-hour testing period.
5.3 Sample Retrieval
At the end of each of the 24-hour testing periods, the canisters were retrieved, disassembled and each
charcoal sample was individually poured through a funnel into a container. Identification numbers
were transferred to the appropriate container, which was sealed and placed in a box for transport.
Retrieval date and time were recorded on the same data sheets as the sample placement information.
The blank samples were similarly processed. All of the radon flux samples and blanks were
successfully retrieved and containerized during the unloading process.
Tellco personnel maintained custody of the samples from collection through analysis.
3
5.4 Environmental Conditions
A rain gauge and thermometer were placed by Cell 3 to monitor rainfall and air temperatures during
sampling in order to ensure compliance with the regulatory measurement criteria.
In accordance with 40 CFR, Part 61, Appendix B, Method 115:
• Measurements were not initiated within 24 hours of rainfall.
• There was no rainfall during either of the 24-hour sampling periods.
• All of the canister seals remained intact during each of the 24-hour sampling periods.
• The criteria regarding minimum air temperature and frozen ground are not applicable when
performing sampling on a quarterly basis; however, the minimum ambient air temperature
measured during the sampling of Cell 3 was approximately 49° F and the ground was not
frozen.
6. SAMPLE ANALYSIS
6.1 Apparatus
Apparatus used for the analysis:
• Single- or multi-channel pulse height analysis system, Ludlum Model 2200 with a
Teledyne 3" x 3" sodium iodide, thallium-activated (Nal(Tl)) detector.
• Lead shielded counting well approximately 40 cm deep with 5-cm thick lead walls and a 7-
cm thick base and 5 cm thick top.
• National Institute of Standards and Technology (NIST) traceable aqueous solution radium-
226 absorbed onto 180 grams of activated charcoal.
• Ohaus Model C501 balance with 0.1 -gram sensitivity.
6.2 Sample Inspection and Documentation
Once in the laboratory, the integrity of each charcoal container was verified by visual inspection of the
plastic container. Laboratory personnel checked for damaged or unsealed containers and verified that
the data sheet was complete.
No damaged or unsealed containers were observed during inspection at the Tellco analytical
laboratory. All 200 samples and ten blanks were ultimately validated after inspection.
6.3 Background and Sample Counting
The gamma ray counting system was checked daily, including background and radium-226 source
measurements prior to and after each counting session. Based on calibration statistics, using two
sources with known radium-226 content, background and source control limits were established for
each Ludlum/Teledyne counting system with shielded well (see Appendix A).
4
Gamma ray counting of exposed charcoal samples included the following steps:
• The length of count time was determined by the activity of the sample being analyzed,
according to a data quality objective of a minimum of 1,000 accrued counts for any given
sample.
• The sample container was centered on the Nal detector and the shielded well door was
closed.
• The sample was counted over a determined count length and then the mid-sample count
time, date, and gross counts were documented on the radon flux measurements data sheet
and used in the calculations.
• The above steps were repeated for each exposed charcoal sample.
• Approximately 10 percent of the containers counted were selected for recounting. These
containers were recounted within a few days following the original count.
7. QUALITY CONTROL (QC) AND DATA VALIDATION
Charcoal flux measurement QC samples included the following intra-laboratory analytical frequency
objectives:
• Blanks, 5 percent, and
• Recounts, 10 percent
All sample data were subjected to validation protocols that included assessments of sensitivity,
precision, accuracy, and completeness. As described below, all Method 115-required data quality
objectives (EPA, 2015) were attained.
7.1 Sensitivity
A total of ten blanks were analyzed by measuring the radon progeny activity in samples subjected to
all aspects of the measurement process, excepting exposure to the source region. These blank sample
measurements comprised approximately five percent of the field measurements. The results of the
blank sample radon flux rates ranged from 0.04 to 0.08 pCi/m2-s, with an average of approximately
0.06 pCi/m2-s. The lower limit of detection (LLD) ranged from 0.03 to 0.04 pCi/m2-s.
7.2 Precision
Twenty recount measurements, distributed throughout the sample sets, were performed by replicating
analyses of individual field samples (see Appendix B). These recount measurements comprised
approximately 10 percent of the total number of samples analyzed. The precision of recount
measurements, expressed as relative percent difference (RPD), for samples having results above one
(1) pCi/m2-s ranged from less than 0.1 percent to 9.5 percent with an average precision of
approximately 2.9 percent RPD. This complies with the precision objective of 10 percent.
5
7.3 Accuracy
Accuracy of field measurements was assessed daily by counting two laboratory control samples with
known Ra-226 content. Accuracy of these lab control sample measurements, expressed as percent
bias, ranged from approximately -1.1 percent to +3.1 percent. The arithmetic average bias of the lab
control sample measurements was approximately +1.0 percent (see Appendix A). This complies with
the accuracy objective of +/-10 percent bias.
7.4 Completeness
A combined total of 200 samples (100 samples from the Cell 3 beach region and 100 samples from
the Cell 3 cover regions) were verified, representing 100 percent completeness, which complies with
the completeness objective of 85 percent.
8. CALCULATIONS
Radon flux rates were calculated for charcoal collection samples using calibration factors derived
from cross-calibration to sources with known total activity with identical geometry as the charcoal
containers. A yield efficiency factor was used to calculate the total activity of the sample charcoal
containers. Individual field sample result values presented were not reduced by the results of the field
blank analyses.
In practice, radon flux rates were calculated by a database computer program. The algorithms utilized
by the data base program were as follows:
Equation 8.1:
, __________N_________pCi Rn-222/m sec — 5(d/91-75)]
where: N = net sample count rate, cpm under 220-662 keV peak
Ts = sample duration, seconds
b = instrument calibration factor, cpm per pCi; values used:
0.1697, for M-01/D-21 and
0.1711, for M-02/D-20
d = decay time, elapsed hours between sample mid-time and count mid-time
A = area of the canister, m2
Equation 8.2:
Error, 2<r = 2x
Gross Sample, cpm Background Sample,cpm
------------------------------------------------------------------1-----------------------------------------------------------------------------------
V Sample Count,t,min Background Count,t,min
--------------------------------------------------------------------------------------x Sample Concentration
Net,cpm
6
Equation 8.3:
LLD =2.71 + (4.65)(Sh)
[Ts*A*b*0.5(d/9T75)]
where: 2.71
4.65
Sb
Ts
b
d
A
= constant
= confidence interval factor
= standard deviation of the background count rate
= sample duration, seconds
= instrument calibration factor, cpm per pCi; values used:
0.1697, for M-01/D-21 and
0.1711, for M-02/D-20
= decay time, elapsed hours between sample mid-time and count mid-time
= area of the canister, m2
9. RESULTS
9.1 Mean Radon Flux
Referencing 40 CFR, Part 61, Subpart W, Appendix B, Method 115 - Monitoring for Radon-222
Emissions, Subsection 2.1.7 - Calculations, "the mean radon flux for each region of the pile and for
the total pile shall be calculated and reported as follows:
(a) The individual radon flux calculations shall be made as provided in Appendix A EPA
86(1). The mean radon flux for each region of the pile shall be calculated by summing all
individual flux measurements for the region and dividing by the total number of flux
measurements for the region.
(b) The mean radon flux for the total uranium mill tailings pile shall be calculated as follows:
h =
Ji A] +... J7A7 r+i... JAi
At
Where: Js = Mean flux for the total pile (pCi/m2-s)
J, = Mean flux measured in region i (pCi/m2-s)
Aj = Area of region i (m2)
At = Total area of the pile (m2)”
40 CFR 61, Subpart W, Appendix B, Method 115, Subsection 2.1.8, Reporting states “The results of
individual flux measurements, the approximate locations on the pile, and the mean radon flux for each
region and the mean radon flux for the total stack [pile] shall be included in the emission test report. Any
condition or unusual event that occurred during the measurements that could significantly affect the results
should be reported."
7
9.2 Site Results
Site Specific Sample Results (reference Appendix C)
(a) The mean radon flux for each region within Cell 3 is as follows:
Cell 3 - Beaches Region = 53.9 pCi/m2-s (based on 26,745 m2 area)
Cell 3 - Covered Region = 12.1 pCi/m2-s (based on 253,479 m2 area)
Cell 3 - Water Region = 0.0 pCi/m2-s (based on 8,634 m2 area)
Note: Reference Appendix C of this report for the entire summary of individual measurement results.
(b) Using the data presented above, the calculated mean radon flux rate for Cell 3 is as follows:
Cell 3 = 15.6 pCi/m2-s
(53.9V26.745H( 12.1 ¥253.479H(0.0¥8.634f =15.6
288,858
As shown above, the arithmetic mean radon flux rate for Cell 3 measured by the October 2015
sampling is below the NRC and EPA standard of 20 pCi/m2-s. Appendix C is a summary of
individual measurement results, including blank sample analysis.
Sample locations are depicted on Figure 2, which is included in Appendix D. As noted on Figure 2,
there were some areas of Cell 3 covered with standing water from recent rainfall events; however,
these rainwater pond areas were not used in the calculation of the weighted average radon flux rate
because they are considered as temporary features. Figure 2 was produced by Tellco.
8
References
U. S. Environmental Protection Agency, Radon Flux Measurements on Gardinier and Royster
Phosphogypsum Piles Near Tampa and Mulberry, Florida, EPA 520/5-85-029, NTIS #PB86-
161874, January 1986.
U. S. Environmental Protection Agency, Title 40, Code of Federal Regulations, July 2015.
U. S. Nuclear Regulatory Commission, Radiological Effluent and Environmental Monitoring at
Uranium Mills, Regulatory Guide 4.14, April 1980.
U. S. Nuclear Regulatory Commission, Title 10, Code of Federal Regulations, Part 40, Appendix A,
January 2015.
9
Figure 1
Large Area Activated Charcoal Canisters Diagram
Miodl*
1 '2-m» Hik» Cti4rcoa> S MPfltP £r aj
l-in. Tn^ck1/4 in. v*m Hoi®Sc/uMiih Ptd
ThickScrubeer Paa
55 Rautn#r
Spfinp
Or.
10-inFVC Eod Cm
iFIStSE__l> Lir}t-Ar»a Ritfen r,»l I actor
10
Appendix A
Charcoal Canister Analyses Support Documents
ACCURACY APPRAISAL TABLE
OCTOBER 2015 RADON SAMPLING
ENERGY FUELS RESOURCES
WHITE MESA MILL, BLANDING, UTAH
2015 NESHAPs RADON FLUX MEASUREMENTS
CELL 3
SAMPLING DATES: 10/12/15-10/14/15
SYSTEM
I.D.
COUNT
DATE
Bkg Counts
#1
(1 min. each)
#2 #3
Source Counts (1 min. each)
#1 #2 #3
AVG NET
cpm
YIELD
cpm/pCi
FOUND
pCi
SOURCE
ID
KNOWN
pCi
% BIAS
M-01/D-21 7/23/2015 142 146 153 10363 10513 10379 10271 0.1697 60526 GS-04 59300 2.1%
M-01/D-21 7/23/2015 128 159 137 10337 10414 10446 10258 0.1697 60446 GS-04 59300 1.9%
M-01/D-21 7/24/2015 158 144 139 10407 10263 10316 10182 0.1697 59998 GS-04 59300 1.2%
M-01/D-21 7/24/2015 138 142 154 10337 10298 10310 10170 0.1697 59931 GS-04 59300 1.1%
M-01/D-21 7/23/2015 142 146 153 10148 10108 10110 9975 0.1697 58780 GS-05 59300 -0.9%
M-01/D-21 7/23/2015 128 159 137 10120 10335 10094 10042 0.1697 59173 GS-05 59300 -0.2%
M-01/D-21 7/24/2015 158 144 139 10096 10041 10171 9956 0.1697 58666 GS-05 59300 -1.1%
M-01/D-21 7/24/2015 138 142 154 10005 10024 10306 9967 0.1697 58733 GS-05 59300 -1.0%
M-02/D-20 7/23/2015 126 153 137 10626 10508 10677 10465 0.1711 61163 GS-04 59300 3.1%
M-02/D-20 7/23/2015 127 143 139 10210 10441 10261 10168 0.1711 59425 GS-04 59300 0.2%
M-02/D-20 7/24/2015 152 133 138 10363 10460 10253 10218 0.1711 59718 GS-04 59300 0.7%
M-02/D-20 7/24/2015 138 126 143 10377 10480 10518 10323 0.1711 60331 GS-04 59300 1.7%
M-02/D-20 7/23/2015 126 153 137 10292 10537 10465 10293 0.1711 60156 GS-05 59300 1.4%
M-02/D-20 7/23/2015 127 143 139 10534 10415 10506 10349 0.1711 60483 GS-05 59300 2.0%
M-02/D-20 7/24/2015 152 133 138 10418 10468 10477 10313 0.1711 60277 GS-05 59300 1.6%
M-02/D-20 7/24/2015 138 126 143 10506 10408 10447 10318 0.1711 60304 GS-05 59300 1.7%
AVERAGE PERCENT BIAS FOR ALL ANALYTICAL SESSIONS:1.0%
CHARCOAL CANISTER ANALYSIS SYSTEM
SITE LOCATION: M;iir uU
CLIENT: l~ul/k R *>> fJ CU5A^
Calibration Check Log
Calibration Date: 7 / f I ‘~T Due Date: ^7 f / *07 j ! (j>System ID: g > / I? - “2- \
Scaler S/N:______€?“ 11? *7 7. High Voltage: t I 3~7 Window: 4.42 Thrshld: 2.20
Detector S/N: (7 ___ Source ID/SN: Source Activity: *5^ "3
Blank Canister Bkgd. Range, cpm: 2 a = 2-> to 1 ^~7 3 o = *7 *4_______to 1 0*
Gross Source Range, cpm: 2o= to \o5^\ 3o= 37(/l to (Og8JL
Technician: <y?/^ ______________________
All counts times are one minute.
?o
Prfi
P06t
Date
■■aaagfel
By Background Counts (1 min, each)
#1 #2 #3 Avg.#1
Source Counts (1 min, each)
#2 #3 Average
1 q4i rt
ok?
Y/N
»47r_>4^153 iitL (P3k3 I£f£L2_io3J7Q>
£3312
_X_
jzHL
I -7J&13 3X a IP 3 37
[QH on
iQMi4 10339 -X1 p/ft/7/5
\Q]\of i*5
13Q)oxu 3 / (23) U,X-
136 t 42-<*?4 K2322 10^36 ic?3 ro \0~b\s 2L
Y/N: Y = average background and source cpm falls within the control limits.
N = average background and source cpm does not fall within the control limits.
The acceptable ranges were determined from prior background and source check data.
CHARCOAL CANISTER ANALYSIS SYSTEM
SITE LOCATION:. NaIIA'-W ; lA4^\ k
CLIENT: ByW/V^y Fuels ffv<PSc> U if Cf S $/\)
Calibration Check Log
System ID: ^ 7" ^ Calibration Date: ~1 j l ft f I ^
Scaler S/N:I *3 *7 '2— High Voltage: U 37 Window:
Detector S/N: 04 1 t>33__________ Source ID/SN: (CrS>' &5
Blank Canister Bkgd. Range, cpm: 2 a =_______to 1 ^>7 3 a =
Gross Source Range, cpm: 2 a = _to _i06jJ_3a =
Technician:
7^
_ Due Date:.
4.42 Thrshld: 2.20
Source Activity: K pO-1
5 to t 0
to 10(0&\
All counts times are one minute.
rnt
PotJr
f> re
Date By
T?Z&
Background Counts (1 min, each)
#1 #2 #3 Avg.
H
#i
mm
Source Counts (1 min, each)
#2 #3 Average
ok?
Y/N
0(1*51 ^IH7-
12-fe
±3k 1S3-m
1 Q)Ofi \o\\Q 1 O I -2-0-
i37 >0 12-0 l(2^i i (20^4
135
14^M 147 l 003 U 10041 1017 1 OiQ3 jZ
iO/ns} n T?U^ f3 |45~00(9 00 2-4 1(7300
Y/N: Y = average background and source cpm falls within the control limits.
N = average background and source cpm does not fall within the control limits.
The acceptable ranges were determined from prior background and source check data.
CHARCOAL CANISTER ANALYSIS SYSTEM
SITE LOCATION:, \aJ K'U M M W\ , U \yl^ U 4^i V\
CLIENT: FlAdlS £US/^_______________
System ID: M ^ 77 O
Scaler S/N: 5'iS03
Calibration Check Log
___ Calibration Date: ihehs
High Voltage: Window:
Detector S/N:
Blank Canister Bkgd. Range, cpm: 2 a =
Gross Source Range, cpm: 2a-
Source ID/SN: ^■jcrS-OH
°jO to 1ST* 3a =
to j 0(0 && 3 a =
Technician:
_ Due Date: ~*) I ! I If
4.42 Thrshld: 2.20
Source Activity: ^*3*3 K. jp£ •
7 j to n 3
37/^ to l°gB3
All counts times are one minute.
Date
Pr<
PO*&
?.~d
By Background Counts (l min, each)
#l #2
HT
#3 Avg.
Source Counts (l min, each)
#l
t Ob~2-Q n #3 Average
ok?
Y/N
137 l 34 ^77 \oL>Oli X
33?T?i-e-x'zn 1W3 i3q I3ly I q-2Jg IP^I
[qhCo
102,*? i 0-^04
IS^L 133.138 151 1Q3*?3 02-S3
I Qq <Tg\ol\U‘ST>^£13&t •*-(<?143 13^\o^in xoh&o 10^18 T'
Y/N: Y = average background and source cpm falls within the control limits.
N = average background and source cpm does not fall within the control limits.
The acceptable ranges were determined from prior background and source check data.
CHARCOAL CANISTER ANALYSIS SYSTEM
SITE LOCATION: We.$« M',11. i«U-UU
rrtFNT- RejfctuiCceS CM'SAN
Calibration Check Log
System ID: ftA ~ O 7-/ P ~ 2-0 _ Calibration Date: njit 11s Due Date:_ ~>h 9h<f
Scaler S/N:-
Detector S/N:
High Voltage: £0>3 Window: 4.42 Thrshld: 2.20
Source ID/SN: M^/crSoS- Source Activity: ^ 3 K £ i
9 0 to 151. 30- '7'-/ to 1-7 3
Blank Canister Bkgd. Range, cpm: 2 a = _
Gross Source Range, cpm: 2 a = °)°) O'i to /OS7Q 30= to /P-737
Technician:
All counts times are one minute.
?o^
Pc<-
pt>6+
Date
*7yS/;S-
yQIni/i^
lOf/isliy
By Background Counts (1 min, each)
#1
ee£
is~*-
#2
q3
IS
\ 3-0
#3
133
_T39
i^3
Avs-
13°)
13.0.
i*tJ
130
#1
IOS-3H
PHlg
Source Counts (1 min, each)
#2
(OS'V?
QHr
ioHtPR
#3
1
iOgP(g
( Q¥-7~7
I OHM-7
Average10^3/
10^65
i9H5~7
i OH5-H-
ok?
Y/N
Y/N: Y = average background and source cpm falls within the control limits.
N = average background and source cpm does not fall within the control limits.
The acceptable ranges were determined from prior background and source check data.
BALANCE OPERATION DAILY CHECK
Balance Model: OHftU S Vor*V~ O - \
Standard Weight la): 300*0 ^'
Date
LO hs 11<Z
/°Ao/
Pre-check (g)
OO. O
3OO .O
Post-check (g)
3oO.O
3 OO.o
O.K. ± 0.1 % ?By
P'Z-tf
Appendix B
Recount Data Analyses
B
CLIENT: ENERGY FUELS RESOURCES PROJECT: RADON FLUX MEASUREMENTS, WHITE MESA MILL
PILE: 3 BATCH: J SURFACE: SOIL
AREA: COVER DEPLOYED: 10 12 15 RETRIEVED:
FIELD TECHNICIANS: CE.DLC, CS, TE COUNTED BY: DLC
COUNTING SYSTEM I.D.: M01/D21, M02/D20 CAL. DUE: 7/18/16
AIR TEMP MIN: 49°F
10 13 15 CHARCOALBKG:
DATA ENTRY BY: DLC
RECOUNT CANISTER ANALYSIS:
LOCATION
JIO
RECOUNT
J2 0
RECOUNT
J30
RECOUNT
J40
RECOUNT
J50
RECOUNT
J60
RECOUNT
J70
RECOUNT
J80
RECOUNT
J90
RECOUNT
JlOO
RECOUNT
SAMPLE
I. D.
JIO
JIO
J20
J2 0
J30
J30
J40
J40
J50
J50
J60
J60
J70
J70
J80
J80
J90
J90
JlOO
JlOO
RETRIV ANALYSIS MID-TIME CNT GROSS
HR MIN HR MIN MO DA YR HR MIN (MIN) COUNTS
8
8
8
8
9
9
9
9
8
8
8
8
9
9
9
9
9
9
9
9
28
28
48
48
8
8
28
28
34
34
28
28
2
2
0
0
21
21
36
36
8
8
8
8
9
9
9
9
8
8
8
8
8
8
8
8
9
9
9
9
38 10 15 15 11 20
38 10 16 15 8 40
46
46
4
4
12
12
42
42
40
40
59
59
57
57
13
13
15
15
10 15 15 11 34
10 16 15 8 40
10 15 15 11 51
10 16 15 8 49
10 15 15 12 6
10 16 15 8 47
10 15 15 12 19
10 16 15 8 52
10 15 15 12 28
10 16 15 8 52
10 15 15 12 42
10 16 15 8 54
10 15 15 12
10 16 15 8
10 15 15 13
10 16 15 8
10 15
10 16
15
15
13
8
53
54
5
55
14
56
2
3
2
2
3
3
1
1
1
1
1
1
1
1
1
1
1
1
2
2
1124
1394
1276
1178
1145
1010
20084
17366
71172
58291
1580
1282
4734
3815
19253
16421
1891
1627
1799
1621
147
227.
227.
224 .
224 .
WEATHER: CLEAR, NO RAIN
cpm Wt. Out:
TARE WEIGHT:
PROJECT NO.: 15004.04
180.0
29.2
GROSS
WT IN
226.5
226.5
224.9
224.9
RADON + LLD
pCi/m2s pCi/m2s pCi/m2s
227.9
227.9
226.4
226.4
228.3
228.3
223.9
223.9
221.0
221.0
222.4
222.4
0.9
0.8
1.0
1.1
0.5
0.5
41.7
42.1
147.0
141.7
3.0
2.8
9.6
9.0
39.9
39.5
3.7
3.6
1.6
1.6
0.1
0.1
0.1
0.1
0.1
0.1
4.2
4.2
14.7
14.2
0.3
0.3
1.0
0.9
4.0
4.0
0.4
0.4
0.2
0.2
0.04
0.04
0.04
0.04
0.04
0.04
0.04
0.04
0.04
0.04
0.04
0.04
0.04
0.04
0.04
0.04
0.04
0.04
0.04
0.04
PRECISION
% RPD
11.8%
9.51
0.0%
1.01
3.7%
6.91
6.5%
1.01
2.7%
0.01
AVERAGE PERCENT PRECISION FOR THE CELL 3 COVER REGION:4.31
Page 1 of 1
CLIENT: ENERGY FUELS RESOURCES PROJECT: RADON FLUX MEASUREMENTS, WHITE MESA MILL PROJECT NO.: 15004.04
PILE: 3 BATCH: H SURFACE: TAILINGS
13AREA: BEACHES DEPLOYED: 10
FIELD TECHNICIANS: CE.DLC, CS, TE
COUNTING SYSTEM I.D.: M01/D21, M02/D20
15 RETRIEVED:
COUNTED BY: DLC
CAL. DUE: 7/18/16
AIR TEMP MIN: 52°F
10 14 15 CHARCOALBKG:
DATA ENTRY BY: DLC
WEATHER: CLEAR, NO RAIN
141 cpm Wt. Out: 180.0 g.
TARE WEIGHT: 29.2 g.
RECOUNT CANISTER ANALYSIS:
GRID
LOCATION
KIO
RECOUNT
K2 0
RECOUNT
K30
RECOUNT
K4 0
RECOUNT
K50
RECOUNT
K6 0
RECOUNT
K70
RECOUNT
K8 0
RECOUNT
K90
RECOUNT
KlOO
RECOUNT
SAMPLE
I . D.
KIO
KIO
K2 0
K2 0
K30
K30
K4 0
K4 0
K50
K50
K60
K60
K70
K70
K80
K80
K90
K90
KlOO
KlOO
RETRIV ANALYSIS MID-TIME
HR MIN HR MIN MO DA YR
I ME CNT GROSS
MIN (MIN) COUNTS
10 26
10 26
10 36
10 36
10 21
10 21
10 31
10 31
10 41
10 41
10 55
10 55
11
11
10
10
11
11
5
5
52
52
2
2
10 32
10 32
10 37
10 37
10
10
10
10
30
30
35
35
10 40
10 40
10 54
10 54
10 59
10 59
11 12
11 12
10
10
10
10
11
11
40
40
54
54
0
0
10 15 15 15
10 16 15 9
10 15 15 15
10 16 15 9
10 15 15 15
10 16 15 9
10 15 15 15
10 16 15 9
10 15 15 15
10 16 15 9
10 15 15 15
10 16 15 9
10 15 15 16
10 16 15 9
10 15 15 16
10 16 15 9
10 15 15 16
10 16 15 9
10 15
10 16
15
15
16
9
16
1
23
1
31
2
38
2
46
4
54
4
1
5
9
5
16
7
24
7
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
47554
40579
3306
3049
15036
12697
21939
19698
22709
19311
14343
12845
22652
19575
32394
28521
8143
6882
23523
20747
GROSS
WT IN
229.6
229.6
227.4
227.4
225.9
225.9
221.4
221.4
223.2
223.2
224.1
224.1
226.7
226.7
223.1
223.1
224.3
224.3
225.0
225.0
RADON + LLD PRECISION
pCi/m2s pCi/m2s pCi/m2s % RPD
82.6
81.3
5.5
5.8
26.0
25.2
38.1
39.0
39.6
38.7
24.9
25.4
39.6
39.2
57.2
57.2
14.1
13.6
41.4
41.4
8.3
8.1
0.6
0.6
2.6
2.5
3.8
3.9
4.0
3.9
2.5
2.5
4.0
3.9
1.4
1.4
4.1
4.1
0.03
0.04
0.03
0.04
0.03
0.04
0.03
0.04
0.03
0.04
0.03
0.04
0.03
0.04
5.7 0.03
5.7 0.04
0.03
0.04
0.03
0.04
1.6%
5.3'
3.1%
2.31
2.3%
2.01
1.0%
0.01
3.6%
0.01
AVERAGE PERCENT PRECISION FOR THE CELL 3 BEACHES REGION:2.11
Appendix C
Radon Flux Sample Laboratory Data (including Blanks)
c
CLIENT: ENERGY FUELS RESOURCES PROJECT: RADON FLUX MEASUREMENTS, WHITE MESA MILL PROJECT NO.: 15004.04
PILE: 3 BATCH: J SURFACE: SOIL AIR TEMP MIN: 49°F
AREA: COVER DEPLOYED: 10 12 15 RETRIEVED: 10 13 15 CHARCOAL BKG:
FIELD TECHNICIANS: CE,DLC, CS, TE COUNTED BY: DLC DATA ENTRY BY: DLC
COUNTING SYSTEM I.D.: M01/D21, M02/D20 CAL. DUE: 7/18/16
WEATHER: CLEAR, NO RAIN
147 cpm Wt. Out: 180.0 g.
TARE WEIGHT: 29.2 g.
LOCATION
JOl
J02
J03
J04
J05
JOS
J07
JO 8
J09
JIO
Jll
J12
J13
J14
J15
J16
J17
J18
J19
J2 0
J21
J22
J23
J24
J25
J26
J2 7
J2 8
J29
J30
J31
J32
J33
J34
J3 5
J3 6
J37
SAMPLE
JOl
J02
J03
J04
J05
JO 6
J07
J08
J09
JIO
Jll
J12
J13
J14
J15
J16
J17
J18
J19
J20
J21
J22
J23
J24
J25
J26
J27
J2 8
J29
J30
J31
J32
J33
J34
J3 5
J3 6
J37
DEPLOY RETRIV ANALYSIS
HR MIN HR MIN MO DA YR
MID-TIME GROSS GROSS RADON
MIN (MIN) COUNTS pCi/m2 s pCi/m2 s pCi/m2s COMMENTS:
8
8
8
8
8
8
8
8
8
8
8
8
8
8
8
8
8
8
8
8
8
8
8
8
8
9
9
9
9
9
9
9
9
9
9
9
9
10
12
14
16
18
20
22
24
26
28
30
32
34
36
38
40
42
44
46
48
50
52
54
56
58
0
2
4
6
8
10
12
14
16
18
20
22
8
8
8
8
8
8
8
8
8
8
8
8
8
8
8
8
8
8
8
8
8
8
8
8
8
9
9
9
9
9
9
9
9
9
9
9
9
30
31
32
33
34
34
35
36
37
38
39
39
40
41
42
43
44
44
45
46
47
48
49
49
50
0
1
2
3
4
4
5
6
7
8
9
9
10 15
10 15
10 15
10 15
10 15
10 15
10 15
10 15
10 15
10 15
10 15
10 15
10 15
10 15
10 15
10 15
10 15
10 15
10 15
10 15
10 15
10 15
10 15
10 15
10 15
10 15
10 15
10 15
10 15
10 15
10 15
10 15
10 15
10 15
10 15
10 15
15 11
15 11
15 11
15 11
15 11
15 11
15 11
15 11
15 11
15 11
15 11
15 11
15 11
15 11
15 11
15 11
15 11
15 11
15 11
15 11
15 11
15 11
15 11
15 11
15 11
15 11
15 11
15 11
15 11
15 11
15 11
15 11
15 11
15 11
15 12
15 12
10 15 15 12
9
9
10
11
14
14
17
17
19
20
22
23
26
27
29
29
31
32
35
34
39
39
42
42
45
45
46
47
50
51
55
54
58
58
0
0
3
1
1
1
2
3
3
2
1
1
2
1
3
1
2
1
1
1
2
4
2
3
2
2
1
1
1
1
3
1
3
3
1
1
1
2
1
2
1998
3615
2990
1474
1384
1188
1303
1638
2140
1124
2641
1166
2251
1588
2752
9974
1427
1581
1137
1276
1217
1848
1399
13412
5496
3260
4679
1347
3734
1145
1125
19795
37214
1454
1281
3674
1288
227
232
226
223
222
231
228
227
227
226
227
230
224.6
228.0
227.1
229.0
226.1
227.7
225.0
224.9
225.0
230.6
228.7
228.3
226.8
226.9
226.6
227.6
225.9
227.1
226.8
227
227
226
227.8
226.4
225.5
. 1
.9
.4
3.8
7.1
5.9
1.2
0.6
0.5
1.0
3.1
4.1
0.9
5.2
0.5
4.4
1.3
5.4
20
2
1
0
1
0
1.6
1.2
27.6
11.2
6.4
9.4
0.6
7.5
0.5
0.5
40.8
77.7
2.7
1.0
7.3
1.0
0.4
0.7
0.6
0.1
0.1
0.1
0.1
0.3
0.4
0.1
0.5
0.1
0.4
0.1
0.5
2.0
0.0
0 .
0.
0.2
0.7
0.1
0.1
0.04
0.04
0.04
0.04
0.04
0.04
0.04
0.04
0.04
0.04
0.04
0.04
0.04
0.04
0.04
0.04
0.04
0.04
0.04
0.04
0.04
0.04
0.04
0.04
0.04
0.04
0.04
0.04
0.04
0.04
0.04
0.04
0.04
0.04
0.04
0.04
0.04
Offset 20ft W
Page 1 of 3
CLIENT: ENERGY FUELS RESOURCES PROJECT: RADON FLUX MEASUREMENTS, WHITE MESA MILL
PILE: 3 BATCH: J SURFACE: SOIL
AREA: COVER DEPLOYED: 10 12 15 RETRIEVED:
FIELD TECHNICIANS: CE.DLC, CS, TE COUNTED BY: DLC
COUNTING SYSTEM I.D.: M01/D21, M02/D20 CAL. DUE: 7/18/16
AIR TEMP MIN: 49°F
10 13 15 CHARCOALBKG:
DATA ENTRY BY: DLC
LOCATION
J38
J3 9
J40
J41
J42
J43
J44
J45
J46
J47
J48
J49
J50
J51
J52
J53
J54
J55
J56
J57
J58
J59
J60
J61
J62
J63
J64
J65
J66
J67
J68
J69
J70
J71
J72
J73
J74
SAMPLE
J38
J39
J40
J41
J42
J43
J44
J45
J46
J47
J48
J49
J50
J51
J52
J53
J54
J55
J56
J57
J58
J59
J60
J61
J62
J63
J64
J65
J66
J67
J68
J69
J70
J71
J72
J73
J74
DEPLOY RETRIV ANALYSIS MID-TIME CNT GROSS
HR MIN HR MIN MO DA YR HR MIN (MIN) COUNTS
9
9
9
9
9
9
8
8
8
8
8
8
8
8
8
8
8
8
8
8
8
8
8
8
8
8
8
8
8
8
8
9
9
9
9
9
9
24
26
28
30
32
34
10
14
18
22
26
30
34
38
42
46
50
10
14
18
22
24
28
33
37
42
46
50
54
56
58
0
2
4
6
8
10
9
9
9
9
9
9
8
8
8
8
8
8
8
8
8
8
8
8
8
8
8
8
8
8
8
8
8
8
8
8
8
8
8
9
9
9
9
10
11
12
13
14
14
30
32
34
36
38
40
42
44
46
48
50
30
32
34
36
38
40
42
44
46
48
50
52
54
55
57
59
0
2
3
5
10 15
10 15
10 15
10 15
10 15
10 15
10 15
10 15
10 15
10 15
10 15
10 15
10 15
10 15
10 15
10 15
10 15
10 15
10 15
10 15
10 15
10 15
10 15
10 15
10 15
10 15
10 15
10 15
10 15
10 15
10 15
10 15
10 15
10 15
10 15
10 15
10 15
15 12
15 12
15 12
15 12
15 12
15 12
15 12
15 12
15 12
15 12
15 12
15 12
15 12
15 12
15 12
15 12
15 12
15 12
15 12
15 12
15
15
15
12
12
12
15 12
15 12
15
15
12
12
15 12
15 12
15 12
15 12
15 12
15 12
15 12
15 12
15 12
15 12
3
6
6
7
8
10
10
13
14
17
17
19
19
21
21
23
23
25
25
27
27
28
28
30
30
31
33
36
37
40
40
42
42
44
44
45
45
1
1
1
1
2
2
1
1
2
1
1
2
1
1
1
2
1
1
1
1
1
1
1
1
1
1
3
1
3
2
1
1
1
1
1
1
1
1172
18186
20084
17998
1180
1138
1727
12322
1571
4056
1284
1834
71172
3775
1228
1323
3035
22409
1606
2633
25882
1458
1580
4791
1032
3710
1081
1035
1177
1726
43190
2957
4734
3093
17470
4997
8469
WEATHER: CLEAR, NO RAIN
147 cpm Wt. Out: 180.0 g.
TARE WEIGHT: 29.2 g.
PROJECT NO.: 15004.04
GROSS RADON ± LLD
WT IN pCi/m2s pCi/m2s pCi/m2s COMMENTS:
228 .
227 .
224 .
225.
227.
227 .
227 .
218.3
215.9
225 ,
225.
225.
227.9
227.1
226.6
224.2
223.3
224.7
221.9
222 .
223 .
213 .
226.4
226.3
223.9
220.4
222.8
214.1
219.
223 .
224 .
226.7
228.3
226.9
224.7
224.6
227.4
,0
.3
,1
. 7
.6
. 0
.7
.6
.2
.2
.1
.0
.2
2.1
38.0
41.7
37.6
0.9
0. 9
3.2
25 .
1.
8 .
2 .
1 .
147.0
7.6
2 .
1 .
6 .
46 .
3.0
5.2
53.1
2.7
3.0
9.7
1,
7 .
0 .
1.9
0.5
1.5
89.8
5.9
9.6
6.2
36.1
10.2
17.4
,8
.5
.4
0.
3 .
4 .
3 ,
0 .
0 .
0 .
2 ,
0 .
0.8
0.2
0.2
14.7
0.8
0.2
5.3
0.2
0.1
0.2
9.0
0.6
1.0
0.6
3.6
1.0
1.7
0.04
0.04
0.04
0.04
04
04
0.04
0.04
0.04
0.04
0.04
0.04
0.04
0.04
0.04
0.04
0.04
0.04
0.04
0.04
04
04
04
04
04
0.04
0.04
0.04
0.04
0.04
0.04
0.04
0.04
0.04
0.04
0.04
0.04
Offset 50ft N
Offset 50ft N
Page 2 of 3
CLIENT: ENERGY FUELS RESOURCES PROJECT: RADON FLUX MEASUREMENTS, WHITE MESA MILL
PILE: 3 BATCH: J SURFACE: SOIL
AREA: COVER DEPLOYED: 10 12 15 RETRIEVED:
FIELD TECHNICIANS: CE,DLC, CS, TE COUNTED BY: DLC
COUNTING SYSTEM I.D.: M01/D21, M02/D20 CAL. DUE: 7/18/16
AIR TEMP MIN: 49°F
10 13 15 CHARCOALBKG:
DATA ENTRY BY: DLC
147
WEATHER: CLEAR, NO RAIN
cpm Wt. Out:
TARE WEIGHT:
PROJECT NO.: 15004.04
180.0
29.2
LOCATION
J75
J76
J77
J78
J79
J80
J81
J82
J83
J84
J85
J86
J87
J88
J89
J90
J91
J92
J93
J94
J95
J96
J97
J98
J99
JlOO
SAMPLE DEPLOY RETRIV ANALYSIS MID-TIME CNT GROSS GROSS RADON + LLD
I. D. HR MIN HR MIN MO DA YR HR MIN (MIN) COUNTS WT IN pCi/m2s pCi/m2s pCi/m2s COMMENTS:
J75
J7 6
J77
J78
J79
J80
J81
J82
J83
J84
J85
J86
J87
J88
J89
J90
J91
J92
J93
J94
J95
J96
J97
J98
J99
JlOO
9 12 9
9 14 9
8 54 8
8 56 8
8 58 8
9 0 8
9 2 8
9 4 9
9 6 9
9 8 9
9 10 9
9 12 9
9 15 9
9 17 9
9 19 9
9 21 9
9 23 9
9 25 9
9 27 9
9 29 9
9 31 9
9 33 10
9 35 9
9 37 9
9 39 9
9 36 9
7
8
52
54
55
57
59
0
2
3
5
7
8
10
11
13
14
16
17
19
20
2
13
14
16
15
10
10
10
10
10
10
10
10
10
10
10
10
10
10
10
10
10
10
10
10
10
10
10
10
10
10
15 15
15 15
15 15
15 15
15 15
15 15
15
15 15
15 15
15 15
15 15
15 15
15 15
15 15
15 15
15 15
15 15
15 15
15 15
15 15
15 15
15 15
15 15
15 15
15 15
15 15
12
12
12
12
12
12
15 12
12
12
12
12
12
13
13
13
13
13
13
13
13
13
13
13
13
13
13
47
47
50
49
53
53
55
55
57
57
59
59
2
1
5
5
6
6
8
8
9
9
11
11
13
14
1
1
3
1
1
1
2
1
1
1
2
1
3
1
1
1
1
1
1
1
1
1
2
1
1
2
5214
1880
1304
6516
8366
19253
1590
2325
10757
17029
1733
15319
1144
8905
1431
1891
2027
5600
3000
14094
6019
8200
1704
1839
2756
1799
222.5
220.9
218.1
223.8
221.9
223.9
230.5
228.3
227.9
223.4
232.1
226.
219 .
221 .
221.9
221.0
222.7
223.6
224.8
226 .
225 .
226 ,
221.
221.
220 .
222 .
.4
. 1
. 7
. 9
. 5
.3
, 1
.2
.7
.4
10.7
3.6
0.6
13.3
17.3
39.9
1
4
22
35
1
31
0
18
2
3
4
11.4
6.0
29.2
12.4
16.4
1.5
3.6
5.6
1.6
1.
0 .
0 .
1.
1.
4 .
0 .
0.
2.2
3.5
0.2
3.2
0.1
1.8
0.3
0.4
0.4
1.1
0.
2 .
1 .
1.
0.
0.4
0.6
0.2
0.04
0.04
0.04
0.04
0.04
0.04
0.04
0.04
0.04
0.04
0.04
0.04
0.04
0.04
0.04
0.04
0.04
0.04
0.04
0.04
0.04
0.04
0.04
0.04
0.04
0.04
AVERAGE RADON FLUX RATE FOR THE CELL 3 COVER REGION:12.1 pCi/m2s
0.3 MIN
147.0 MAX
RADON
BLANK CANISTER ANALYSIS:
SAMPLE RETRIV ANALYSIS MID-TIME CNT GROSS GROSS
LOCATION
J BLANK 1
J BLANK 2
J BLANK 3
J BLANK 4
J BLANK 5
I. D.HR MIN HR MIN MO DA YR HR MIN (MIN) COUNTS WT IN pCi/m2 s pCi/m2 s pCi/m2s COMMENTS:
J BLANK 1 8 0 8 30 10 15 15 9 57 10 1857 208.1 0.08 0.03 0.04 CONTROL
J BLANK 2 8 0 8 30 10 15 15 9 57 10 1715 208.2 0.05 0.03 0.04 CONTROL
J BLANK 3 8 0 8 30 10 15 15 10 8 10 1802 207.9 0.07 0.03 0.04 CONTROL
J BLANK 4 8 0 8 30 10 15 15 10 8 10 1667 208.2 0.04 0.03 0.04 CONTROL
J BLANK 5 8 0 8 30 10 15 15 10 20 10 1765 208.1 0.06 0.03 0.04 CONTROL
AVERAGE BLANK CANISTER ANALYSIS FOR THE CELL 3 COVER REGION:0.06 pCi/m2 s
Page 3 of 3
CLIENT: ENERGY FUELS RESOURCES PROJECT: RADON FLUX MEASUREMENTS, WHITE MESA MILL PROJECT NO.: 15004.04
PILE: 3 BATCH: H SURFACE: TAILINGS AIR TEMP MIN: 52°F WEATHER: CLEAR, NO RAIN
AREA: BEACHES DEPLOYED: 10 13 15 RETRIEVED: 10 14 15 CHARCOAL BKG: 141 cpm Wt. Out: 180.0 g.
FIELD TECHNICIANS: CE,DLC,CS,TE COUNTED BY: DLC DATA ENTRY BY: DLC TARE WEIGHT: 29.2 g.
COUNTING SYSTEM I.D.: M01/D21, M02/D20 CAL. DUE: 7/18/16
LOCATION
KOI
K02
K03
K04
K05
K06
K07
K08
K09
KIO
Kll
K12
K13
K14
K15
K16
K17
K18
K19
K2 0
K21
K22
K23
K24
K25
K26
K2 7
K2 8
K29
K30
K31
K32
K33
K34
K3 5
K3 6
K37
SAMPLE
I. D.
KOI
K02
K03
K04
K05
K06
K07
K08
K09
KIO
Kll
K12
K13
K14
K15
K16
K17
K18
K19
K2 0
K21
K22
K2 3
K24
K25
K26
K27
K2 8
K2 9
K30
K31
K32
K33
K34
K3 5
K36
K37
DEPLOY RETRIV ANALYSIS MID-TIME CNT GROSS
HR MIN HR MIN MO DA YR HR MIN (MIN) COUNTS
GROSS GROSS RADON
WT IN pCi/m2s pCi/m2s pCi/m2s COMMENTS:
10 17
10 18
10 19
10 20
10 21
10 22
10
10
10
10
10
10
23
24
10 25
10 26
10 27
10 28
10 29
10 30
10 31
10 32
10 33
10 34
35
36
10 37
10 38
10 39
10 40
10 41
10 17
10 18
10 19
10 20
10 21
22
23
10 24
10 25
10 26
10 27
10 28
10
10
10
10
10
10
10
10
10
10
10
10
10
10
10
10
10
10
10
10
10
10
10
10
10
10
10
10
10
10
10
28
28
29
29
30
30
31
31
32
32
33
33
34
34
35
35
36
10 36
10 37
37
38
38
39
39
10 40
10 28
28
29
10 29
10 30
30
31
31
32
32
33
33
10 15
10 15
10 15
10 15
10 15
10 15
10 15
10 15
10 15
10 15
10 15
10 15
10 15
10 15
10 15
10 15
10 15
10 15
10 15
10 15
10 15
10 15
10 15
10 15
10 15
10 15
10 15
10 15
10 15
10 15
10 15
10 15
10 15
10 15
10 15
10 15
10 15
15 15
15 15
15 15
15 15
15 15
15 15
15 15
15 15
15 15
15 15
15 15
15 15
15 15
15 15
15 15
15 15
15 15
15 15
15 15
15 15
15 15
15 15
15 15
15 15
15 15
15 15
15 15
15 15
15 15
15 15
15 15
15 15
15 15
15 15
15 15
15 15
15 15
10
10
11
11
13
13
14
14
16
16
17
17
19
19
20
20
22
22
23
23
25
25
26
26
28
28
29
29
31
31
32
32
34
34
35
35
37
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1767
2404
1233
3373
1651
2920
16586
67595
36371
47554
34478
45229
42751
27301
63931
68859
58442
44275
23232
3306
41903
76655
4111
17813
48175
24883
30499
12292
62054
15036
1120
1517
3312
5822
16623
26454
10642
226.6
233.2
227.4
225.6
231.9
227.4
226.9
227.5
230.3
229.6
227.9
228.0
228.0
227.2
228.2
230.7
228.9
227.0
232.0
227.4
232.0
231.4
228.1
226.7
225.1
224.8
227.7
225.6
225.9
225.9
232.3
223.7
225.9
226.5
226.3
224.1
232.4
2 ,
3 ,
1
5
2
4 .
28 .
117 .
63,
82.6
60
78
74
47
112
120
102
77
40
5
73.6
133.9
7.0
30.9
84.8
43.1
53.3
21.2
108.8
26.0
1.7
2.4
5.6
9.9
29.0
46.0
18.5
0.3
0.4
0.2
0.6
0.3
0.5
2.9
. 7
.4
.3
. 0
11 ,
6.
8 .
6 .
7.9
7.5
4.7
11.2
12.0
10.3
7.7
4.1
0.6
7.4
13.4
0.7
3.1
8.5
4.3
5.3
2 ,
10.
2 .
0 .
0 ,
0.
1.
2 .
4 .
1.9
0,03
0.03
0.03
0.03
0.03
0.03
0.03
0.03
0.03
0.03
0.03
0.03
0.03
0.03
0.03
0.03
0.03
0.03
0.03
0.03
0.03
0.03
0.03
0.03
0.03
0.03
0.03
0.03
0.03
0.03
0.03
0.03
0.03
0.03
0.03
0.03
0.03
Paqe 1 of 3
CLIENT: ENERGY FUELS RESOURCES PROJECT: RADON FLUX MEASUREMENTS, WHITE MESA MILL PROJECT NO.: 15004.04
PILE: 3 BATCH: H SURFACE: TAILINGS AIR TEMP MIN: 52°F WEATHER: CLEAR, NO RAIN
AREA: BEACHES DEPLOYED: 10 13 15 RETRIEVED: 10 14 15 CHARCOAL BKG: 141 cpm Wt. Out: 180.0 g.
FIELD TECHNICIANS: CE,DLC, CS, TE COUNTED BY: DLC DATA ENTRY BY: DLC TARE WEIGHT: 29.2 g
COUNTING SYSTEM I.D.: M01/D21, M02/D20 CAL. DUE: 7/18/16
SAMPLE DEPLOY RETRIV ANALYSIS MID-TIME CNT GROSS GROSS RADON + LLD
HR MIN HR MIN MO DA YR HR MIN (MIN) COUNTS WT IN pCi/m2s pCi/m2 s pCi/m2 s COMMENTS:
GROSS GROSS
LOCATION
K38
K3 9
K4 0
K41
K42
K4 3
K44
K45
K46
K47
K4 8
K49
K50
K51
K52
K53
K54
K55
K56
K57
K58
K59
K60
K61
K62
K63
K64
K65
K66
K67
K68
K69
K70
K71
K72
K73
K74
I. D.
K3 8
K3 9
K4 0
K41
K42
K43
K44
K45
K46
K47
K4 8
K49
K50
K51
K52
K53
K54
K55
K56
K57
K58
K59
K6 0
K61
K62
K63
K64
K65
K66
K67
K68
K69
K70
K71
K72
K73
K74
10 29
10 30
10 31
10 32
10
10
10
11
11
11
11
11
11
11
11
11
33
34
35
10 36
10 37
10 38
10 39
10 40
10 41
10 46
10 47
10 48
10 49
10 50
10 51
10 52
10 53
10 54
10 55
10 56
10 57
10 58
10 59
11 0
1
2
3
4
6
7
8
9
10
10
10
10
10
10
10
10
10
10
10
10
10
10
10
10
10
10
10
10
10
10
10
10
10
10
10
10
10
10
10
10
10
11
11
11
11
34
34
35
35
36
36
37
37
38
38
39
39
40
50
50
51
51
52
52
53
53
54
54
55
55
56
56
57
57
58
58
59
59
0
0
1
1
10 15
10 15
10 15
10 15
10 15
10 15
10 15
10 15
10 15
10 15
10 15
10 15
10 15
10 15
10 15
10 15
10 15
10 15
10 15
10 15
10 15
10 15
10 15
10 15
10 15
10 15
10 15
10 15
10 15
10 15
10 15
10 15
10 15
10 15
10 15
10 15
10 15
15 15
15 15
15 15
15 15
15 15
15 15
15 15
15 15
15 15
15 15
15 15
15 15
15 15
15 15
15 15
15 15
15 15
15 15
15 15
15 15
15 15
15 15
15 15
15 15
15 15
15 15
15 15
15 15
15 15
15 16
15 16
15 16
15 16
15 16
15 16
15 16
15 16
37
38
38
40
40
41
41
43
43
44
44
46
46
48
48
49
49
51
51
52
52
54
54
55
55
57
57
58
58
0
0
1
1
3
3
4
4
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
36668
12268
21939
21309
37238
20152
8131
8533
43349
9446
48876
5104
22709
15001
28671
28296
36611
1729
9296
38080
28561
21191
14343
24320
22683
23945
28201
19550
35550
45327
21553
19773
22652
8639
53070
21813
44384
223.0
222.5
221.4
223.0
225.6
224.3
224.2
225.5
224.6
225.4
227.9
222.3
223.2
225.0
230.1
223.5
228.1
224.0
226.0
223.9
234.5
223.7
224.1
224.5
225.6
224.4
224.6
225.3
225.8
228.6
225.2
224.4
226.7
226.7
226.9
227.0
225.4
63.9
21.4
38.1
37.4
64.9
35.3
14.0
14.8
75.7
16.5
85.5
8.8
39.6
26.2
49.9
49.7
63.8
2.8
16.0
67.0
49.8
37.2
24.9
42.8
39.6
42.1
49.3
34.4
62.2
80.1
37.7
34.8
39.6
15.1
93.2
38.5
78.0
6.4
2.1
3.8
3.7
6.5
3.5
1.
1.
7 .
1.
8 .
0.
4 .
2 .
5.0
5.0
6.
0 .
1 .
6 .
5
3 ,
2 .
4.
4 .
4 .
4 .
3.4
6.2
8.0
3 .
3 .
4.
1.
9.3
3.8
7.8
0.03
0.03
0.03
0.03
0.03
0.03
0.03
0.03
0.03
0.03
0.03
0.03
0.03
0.03
0.03
0.03
0.03
0.03
0.03
0.03
0.03
0.03
0.03
0.03
0.03
0.03
0.03
0.03
0.03
0.03
0.03
0.03
0.03
0.03
0.03
0.03
0.03
Page 2 of 3
CLIENT: ENERGY FUELS RESOURCES PROJECT: RADON FLUX MEASUREMENTS, WHITE MESA MILL PROJECT NO.: 15004.04
PILE: 3 BATCH: H SURFACE: TAILINGS AIR TEMP MIN: 52°F WEATHER: CLEAR, NO RAIN
AREA: BEACHES DEPLOYED: 10 13 15 RETRIEVED: 10 14 15 CHARCOAL BKG: 141 cpm Wt. Out: 180.0 g.
FIELD TECHNICIANS: CE,DLC, CS, TE COUNTED BY: DLC DATA ENTRY BY: DLC TARE WEIGHT: 29.2 g.
COUNTING SYSTEM I.D.: M01/D21, M02/D20 CAL. DUE: 7/18/16
LOCATION
K75
K76
K77
K78
K79
K8 0
K81
K82
K8 3
K84
K85
K86
K8 7
K8 8
K89
K90
K91
K92
K93
K94
K95
K96
K97
K98
K99
KlOO
SAMPLE DEPLOY RETRIV ANALYSIS MID-TIME CNT GROSS GROSS RADON ± LLD
I. D. HR MIN HR MIN MO DA YR HR MIN (MIN) COUNTS WT IN pCi/m2s pCi/m2s pCi/m2 s COMMENTS;
K75
K76
K77
K78
K79
K8 0
K81
K82
K8 3
K84
K85
K86
K8 7
K8 8
K89
K90
K91
K92
K93
K94
K95
K96
K97
K98
K99
KlOO
11 10
10 48
10
10
10
10
49
50
51
52
10 53
10 54
55
56
11
10
10
10
10
10
10
10
10
10
10 57 10
10 58 10
59 10
0
1
2
3
4
5
6
7
8
9
10
11
12
10
10
10
11
11
11
11
11
11
11
11
11
11
11
11
11
10
10
10
10
10
11
11
10
10
10
10
10
11
2
32
34
36
38
40
42
32
34
36
38
40
42
50
52
54
56
58
0
2
50
52
54
56
58
0
10 15
10 15
10 15
10 15
10 15
10 15
10 15
10 15
10 15
10 15
10 15
10 15
10 15
10 15
10 15
10 15
10 15
10 15
10 15
10 15
10 15
10 15
10 15
10 15
10 15
10 15
15
15
15
15
15
15
15
15
15
15
15
15
15
15
15
15
15
15
15
15
15
15
15
15
15
15
16
16
16
16
16
16
16
16
16
16
16
16
16
16
16
16
16
16
16
16
16
16
16
16
16
16
6
6
7
7
9
9
10
10
12
12
13
13
15
15
16
16
18
18
19
19
21
21
22
22
24
24
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
41705
138145
37656
112253
49716
32394
18692
47703
53365
7167
12601
7986
96859
77621
2815
8143
28367
132687
87612
46435
13818
13668
1630
42316
30066
23523
221.8
225.0
218.7
225.1
223.2
223.1
222.0
220.7
216.3
223.9
223.6
227.4
224.2
222.6
221.1
224.3
225.2
223.4
224.1
221.8
220.4
224.0
. 7
.2
.1
.0
221
224
223
225.0
73.9
245.4
67.2
199.1
88 .
57 ,
33.
85.
95.8
12.5
22.4
14.0
173.5
137.1
4.8
14.1
50.2
233.8
155.5
81.5
24.5
24.0
2.7
74.8
53.5
41.4
7.4
24.5
6.7
19.9
8.9
5.7
3.3
8.5
9
1
2
1
17
13
0.5
1.4
5.0
23.4
15.5
8.2
2.5
2.4
0
7
5
4
0.03
0.03
03
03
.3
.5
. 4
. 1
0.03
0.03
0.03
0.03
0.03
0.03
0.03
0.03
0.03
0.03
0.03
0.03
0.03
0.03
0.03
0.03
0.03
0.03
0.03
03
03
0.03
AVERAGE RADON FLUX RATE FOR THE CELL 3 BEACHES REGION:53.9 pCi/m2s
BLANK CANISTER ANALYSIS:
1.7
245.4 MAX
RADON
LOCATION
SAMPLE RETRIV ANALYSIS MID-TIME CNT GROSS GROSS RADON ± LLD
I. D. HR MIN HR MIN MO DA YR HR MIN (MIN) COUNTS WT IN pCi/m2 s pCi/m2 s pCi/m2 s COMMENTS:
K BLANK 1 K BLANK 1 10 0
K BLANK 2 K BLANK 2 10 0
K BLANK 3 K BLANK 3 10 0
K BLANK 4 K BLANK 4 10 0
K BLANK 5 K BLANK 5 10 0
10 25 10 15 15 10 33
10 25 10 15 15 10 33
10 25 10 15 15 10 45
10 25 10 15 15 10 45
10 25 10 15 15 10 59
10
10
10
10
10
1778
1713
1685
1738
1784
208.9
210.5
208.4
210.2
210.6
0.06
0.05
0.05
0.05
0.06
0.02
0.02
0.02
0.02
0.02
0.03
0.03
0.03
0.03
0.03
CONTROL
CONTROL
CONTROL
CONTROL
CONTROL
AVERAGE BLANK CANISTER ANALYSIS FOR THE CELL 3 BEACHES REGION:0.06 pCi/m2 s
Appendix D
Sample Locations Map (Figure 2)
D
CELL 1~
U'l
M *•---1-
s
♦ —?
*
□
-CELL 2
J01
J12
J13
J24J02
J25
PJ36J14
J37 REGIONJ23J03SIDINGJ10J26
^fG/O/v J35J15 J98J22J38 J97J04 J54J27J09 J53■ne.J34 -+ll£S~J16 J52J39J21 J51J05J28 J50J08J65J33WET.J49J17J40J64J62J20 J48J63J61J06J29 J47'flies.CELLJ07 standJ32INgWatEr,J46J66J41-*tT J45J19J60J100J67 J44J59J30J68°°UNoJ31 c°veRe J58J69*RY B£T 0 Regio J57J42J70weenJ77 J56J43J71rilesJ788£4CAy J55J72J79J73J80LlQUinJ74J81J96J75J82J95J76J83J94J84J93
J85J92
J86J91
J90
J89
J88
J87
CELL4B
CELL 4A
WHITE MESA MILL
BLANDING. UTAH
NESHAPS 2015
CELL 3
OCTOBER 2015 SAMPLING
10/12/15-10/14/15
PREPARED FOR
ENERGY FUELS RESOURCES
LEGEND
KOI • - SAMPLE LOCATION ON
BEACH AREAS
J01 O ■ SAMPLE LOCATION ON
COVERED AREAS
FIGURE 2
/V
I
SCALE IN FEET
200 100 0 200 400
TEUCO
ENVIRONMENTAL LLC
THIS DRAWING IS THE PROPERTY OF TELLCO
ENVIRONMENTAL, LLC, AND IS NOT TO BE
REPRODUCED, MODIFIED OR USED FOR ANY
OTHER PROJECT OR EXTENSION OF THIS PROJECT
EXCEPT BY AGREEMENT WITH TELLCO.