DRC-2012-001440 - 0901a068802d2401

DENISO
MINES
UT/ I'-p'^P^-TNT OF
/ NTAL QUALITY
Denlson Mines (USA) Corp.
105017th Street, Suite 950
Denver, CO 80265
USA
Tel: [phone]
Fax:[phone]
www.denisonmines.com
UrJ 1 ^ 2012
DIViSiON OF AIR QUALITY
March 13, 2012
Bryce C. Bird
Division Director
Utah Department of Environmental Quality
Division of Air Quality
195 North 1950 West
Salt Lake City, Utah 84116-3097
Re: 40 Code of Federal Regulations, Part 61.254, Subpart W Radon Flux Reporting
for the White Mesa Mill
Dear Mr. Bird:
This transmittal letter contains the annual reporting for Denison Mines (USA) Corp.'s White Mesa Mill, per 40
CFR 61.254 for 2011. The results of the 2011 testing indicate that the facility was in compliance with the 20
pCi/m^-sec radon emanation standard set out in 40 CFR 61.252(a), based on results of 18.0 pCi/m^-sec and 14.0
pCi/m^-sec for Cells 2 and 3 respectively.
In accordance with the requirement of the NESHAP standard my signature below affirms the following
Certification with respect to the 2011 Report, which certification is incorporated by reference in and is a
part of the 2011 Report:
"T 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."
If you should have any questions regarding this report please contact Jo Ann Tischler, Denison's
Director, Compliance and Permitting (303.389.4132) or David Turk, Radiation Safety Officer (435.678.2221)
with any questions you may have.
Yours very truly,
Denison Mines/USA) Corp.
DavidOC .jJ^dfenlund
Vice President, Regulatory Affairs and Counsel
Enclosure
Date 3/ jocument
DAQ-201 2-002765
3/2012
cc: Director, Air and Toxics Technical Enforcement Program, US EPA Region VIII
Jo Ann Tischler, Denison Mines (USA) Corp.
Harold R. Roberts, Denison Mines (USA) Corp.
David A. Turk, Denison Mines (USA) Corp.
DENISO
MINES
I
National Emission Standards for Hazardous Air Pollutants
2011 Radon Flux Measurement Program
White Mesa Mill
6425 South Highway 191
Blanding, Utah 84511
Prepared for: Denison Mines (USA) Corporation
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 HISTORY AND DESCRIPTION 1
3. REGULATORY REQUIREMENTS FOR THE SITE 1
4. SAMPLING METHODOLOGY 2
5. FIELD OPERATIONS 3
5.1 Equipment Preparation 3
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 June 2011, Tellco Environmental, LLC (Tellco) of Grand Junction, Colorado, provided
support to Denison Mines (USA) Corporation (Denison Mines) regarding the required National
Emission Standards for Hazardous Air Pollutants (NESHAPs) Radon Flux Measurements. These
measurements are required of Denison Mines to show compliance with Federal Regulations. The
standard is not an average per facility, but is an average per radon source.
Tellco was contracted to provide radon canisters, equipment, and canister placement personnel as well
as lab analysis of samples for calendar year 2011. The sampling effort commenced on June 6, 2011.
Denison Mines personnel provided support for loading and unloading charcoal from the canisters.
This report includes the procedures employed by Denison Mines and Tellco to obtain the results
presented in Section 9.0 ofthis 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 four lined cells,
which vary in depth. At the time ofthe June 2011 radon testing. Cell 1 and Cell 4B were used for
"liquor" storage, while Cell 4A is used for sand tailings/liquor deposition.
Cell 2, wliich has a total area of approximately 270,624 square meters (m^), has been filled and
covered with interim cover. This cell was comprised of one region, a soil cover of varying thickness,
which required NESHAPs radon flux monitoring. There were no exposed tailings or standing liquid
within Cell 2.
Cell 3, which has a total area of 288,858 m^, is nearly filled with tailings sand and is undergoing pre-
closure activities. This cell was comprised of two source regions that required NESHAPs radon
monitoring: at the time ofthe June 2011 radon sampling, approximately 153,773 m^ of the cell had a
soil cover of varying thickness, and approximately 82,239 m^ of exposed tailings "beaches". The
remaining approximately 52,846 m^ was covered by standing liquid in "low" elevation areas. The
standing liquid level was a little lower than in 2010. Raffinate crystals and residue from the repair of
the original Cell 4A in 2006 have been placed in Cell 3.
The Cell 2 and Cell 3 cover regions were approximately the same size (area) during the 2011 radon
flux sampling as they were for the 2010 sampling program; the standing liquid area in Cell 3 was a
little smaller in area. Due to worker health and safety concems expressed by both Denison Mines and
Tellco personnel, portions of the unstable and wet beaches and covered areas were not sampled. The
areas tested for radon emanation are representative of the disposition of tailings for the 2011 reporting
period.
3. REGULATORY REQUIREMENTS FOR THE SITE
Radon emissions fi-om 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, Nafional 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
existing uranium mill tailings pile shall not exceed an average of 20 picoCuries per square meter per
second (pCi/m2-s) for each pile or region. 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 constmcted 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. Radon flux measurements were performed on
Cells 2 and 3 as discussed below.
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, 2009). 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 Vz inch thick layer of foam and
secured with a retaining ring under VA inches of foam (see Figure 1, page 10).
One hundred canisters were placed in each region: one region in Cell 2 and two regions in Cell 3 as
depicted on the Sample Locations Map (see Figure 2, Appendix D). Due to worker health and safety
concems, measurement of the wet beach areas of Cell 3 was limited to areas readily accessible by
foot. 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 weis 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 24 hours, the exposed charcoal was transferred to a sealed plastic sample container (to prevent
radon loss and/or fiirther 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 Denison Mines 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.
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 t£^e. 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
Designated sample point locations were established within each of the three regions (one region in
Cell 2 and two regions in Cell 3). 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., KOI.. .KlOO). 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.
The sampling locations were spread out throughout each region. 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) for each region were similarly processed and the canisters were kept inside an
airtight plastic bag during each 24-hour testing period.
5.3 Sample Retrieval
At the end of the 24-hour testing period, all canisters were disassembled and each 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 fransport. Retrieval date and time
were recorded on the same data sheets as the sample placement information. The blank samples were
similarly processed.
5.4 Environmental Conditions
A rain gauge and a mmimum/maximum thermometer were in place at the White Mesa Millsite 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.
• No rainfall occurred during any of the sampling periods.
• None of the radon measurements presented in this report were performed during
temperatures below 35°F or on frozen ground (the minimum air temperature recorded at
the site during the collection periods was 42°F).
6. SAMPLE ANALYSIS
6.1 Apparatus
Apparatus used forthe 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 ofthe
plastic container. Laboratory staff documented damaged or unsealed containers and verified that the
data sheet was complete.
All of the 300 sample containers received and inspected at the Tellco analytical laboratory were
verified as valid; no samples were lost.
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).
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 witliin 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. All method-required data quality objectives (EPA, 2009) were
attained.
7.1 Sensitivity
A total of fifteen 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 5 percent ofthe field measurements. The results of
the blank sample radon flux rates ranged from 0.03 to 0.15 pCi/m^-s, with an average of
approximately 0.07 pCi/m^-s.
7.2 Precision
Thirty 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 1 percent to 8.7
percent with an overall average precision of approximately 2.7 percent.
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 confrol sample measurements, expressed as percent
bias, ranged from approximately -1.2 percent to +2.0 percent. The arithmetic average bias of the lab
confrol sample measurements was approximately +0.4 percent (see Appendix A).
7.4 Completeness
All 100 samples from the Cell 2 Cover Region were verified, representing 100 percent completeness
for that region.
All 100 samples from the Cell 3 Beaches region were verified, representing 100 percent completeness
for that region.
All 100 samples from the Cell 3 Covered Region were verified, representing 100 percent
completeness for that region.
Altogether, all 300 samples from 300 sample locations were verified during this sampling program,
representing 100 percent completeness overall.
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 ofthe 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 = J^^+^^^^+Q ^(d/Sl.??)^
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:
0.1713, for M-Ol/D-21 and
0.1718, for M-02/D-20
d - decay time, elapsed hours between sample mid-time and count mid-time
A = area of the canister, m^
Equation 8.2:
Gross Sample, cpm Background Sample,cpm
+ • Sample Count,t,min Background Count,t,min
Error,2(T = 2x x Sample Concentration
Net,cpm
Equation 8.3:
2.7l + (4.65)(S.)
[Ts*A*b*0.5('^'^''>l
where: 2.71 = constant
4.65 = confidence interval factor
Sb = standard deviation of the background count rate
Ts = sample duration, seconds
b = instrument calibration factor, cpm per pCi; values used:
0.1713, for M-Ol/D-21 and
0.1718, for M-02/D-20
d = decay time, elapsed hours between sample mid-time and count mid-time
A = area of the canister, m^
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:
Jl Al + . .. J7A9 r+1 . • • J.A.
Js =
At
Where: Jg = Mean flux for the total pile (pCi/m^-s)
Ji = Mean flux measured in region i (pCi/m^-s)
Ai = Area of region i (m^)
At = Total area ofthe pile (m^)"
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."
9.2 Site Results
Site Specific Sample Results (reference Figure 2 and Appendix C)
«.
(a) The mean radon flux for each region within the site as follows:
Cell 2 - Cover Area = 18.0 pCi/m^-s (based on 270,624 m^ area)
Cell 3 - Cover Area = 9.5 pCi/m^-s (based on 153,773 m^ area)
- Beach Areas = 31.4 pCi/m^-s (based on 82,239 m^ area)
- Standing Liquid 0 pCi/m^-s (based on 52,846 m^ 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 for each cell (pile) is, as follows:
Cell 2= 18.0pCi/m^-s
n 8.0X270.624)
270,624
Cell 3= 14.0pCi/m^-s
(9.5)(153J73) + ni.4¥82.239) + roy52.846)
288,858
The weighted average radon flux rate as shown above for Cell 3 was calculated in accordance to
Subsection 2.1.3 (a) of the EPA's Method 115, which states "Water covered area - no
measurements required as radon flux is assumed to be zero".
As shown above, the arithmetic mean radon flux for each cell at Denison Mines White Mesa milling
facility is below the NRC and EPA standard of 20 pCi/m^-s. No condition or unusual event
occurred during the measurements that could significantly affect the reported results. 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.
References
U. S. Envirormiental 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, February 2009.
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 2009.
Figure 1
Large Area Activated Charcoal Canisters Diagram
1/4 in. V«ni Hole
10
DENISON MINES (USA) CORPORATION
WHITE MESA MILL, BLANDING, UTAH
2011 NESHAPs RADON FLUX MEASUREMENTS
CELLS 2 & 3
ACCURACY APPRAISAL TABLE
SYSTEM DATE Bkg Counts (1 min. each) Source Counts (1 min. each) AVG NET YIELD FOUND SOURCE KNOWN % BIAS
I.D. #1 #2 #3 #1 #2 #3 cpm cpm/pCi pCi ID pCi
M-Ol/D-21 6/10/2011 154 149 155 10483 10233 10476 10245 0.1713 59805 GS-04 59300 0.9%
M-Ol/D-21 6/10/2011 139 111 149 10302 10313 10293 10170 0.1713 59368 GS-04 59300 0.1%
M-01/D-21 6/11/2011 139 137 159 10405 10222 10374 10189 0.1713 59478 GS-04 59300 0.3%
M-Ol/D-21 6/11/2011 152 140 155 10353 10241 10280 10142 0.1713 59208 GS-04 59300 -0.2%
M-Ol/D-21 6/12/2011 127 121 133 10321 10250 10373 10188 0.1713 59473 GS-04 59300 0.3%
M-01/D-21 6/12/2011 129 116 135 10468 10430 10346 10288 0.1713 60058 GS-04 59300 1.3%
M-Ol/D-21 6/10/2011 154 149 155 10417 10430 10179 10189 0.1713 59482 GS-05 59300 0.3%
M-Ol/D-21 6/10/2011 139 111 149 10367 10387 10265 10207 0.1713 59584 GS-05 59300 0.5%
M-01/D-21 6/11/2011 139 137 159 10312 10516 10420 10271 0.1713 59959 GS-05 59300 1.1%
M-Ol/D-21 6/11/2011 152 140 155 10324 10336 10604 10272 0.1713 59967 GS-05 59300 1.1%
M-Ol/D-21 6/12/2011 127 121 133 10489 10437 10161 10235 0.1713 59751 GS-05 59300 0.8%
M-Ol/D-21 6/12/2011 129 116 135 10347 10315 10420 10234 0.1713 59743 GS-05 59300 0.7%
M-02/D-20 6/10/2011 132 144 137 10348 10316 10285 10179 0.1718 59247 GS-04 59300 -0.1%
M-02/D-20 6/10/2011 145 155 133 10410 10448 10337 10254 0.1718 59686 GS-04 59300 0.7%
M-02/D-20 6/11/2011 130 145 137 10428 10460 10343 10273 0.1718 59796 GS-04 59300 0.8%
M-02/D-20 6/11/2011 160 151 146 10278 10337 10144 10101 0.1718 58793 GS-04 59300 -0.9%
M-02/D-20 6/12/2011 137 132 149 10231 10346 10310 10156 0.1718 59117 GS-04 59300 -0.3%
M-02/D-20 6/12/2011 124 127 137 10263 10200 10195 10090 0.1718 58731 GS-04 59300 -1.0%
M-02/D-20 6/10/2011 132 144 137 10370 10524 10504 10328 0.1718 60118 GS-05 59300 1.4%
M-02/D-20 6/10/2011 145 155 133 10545 10468 10359 10313 0.1718 60029 GS-05 59300 1.2%
M-02/D-20 6/11/2011 130 145 137 10164 10382 10289 10141 0.1718 59028 GS-05 59300 -0.5%
M-02/D-20 6/11/2011 160 151 146 10533 10578 10519 10391 0.1718 60483 GS-05 59300 2.0%
M-02/D-20 6/12/2011 137 132 149 10247 10343 10296 10156 0.1718 59115 GS-05 59300 -0.3%
M-02/D-20 6/12/2011 124 127 137 10161 10182 10230 10062 0.1718 58566 GS-05 59300 -1.2%
AVERAGE PERCENT BIAS FOR ALL ANALYTICAL SESSIONS: 0.4%
A-1
CHARCOAL CANISTER ANALYSIS SYSTEM
SITE LOCATION: Vj KI^U We^^ lAlH ^ ^Unj^^ . M,T
CLIENT: ^\^/^^S Cu^Sfif) Cof^ .
Calibration Check Log
System ID: ^A " "2.-/ t> ' ZO Calibration Date: ^ / iO h\ DuePate: O'/lo/l'^L-
ScalerS/N:_5jSJ^3. High Voltage: Window: 4.42 Thrshid: 2.20
Detector S/N: H 1 SS'X- Source ID/SN: ^ ^ ^ V Source Activity: S^'Z^^Cj
Blank Canister Bkgd. Range, cpm: 2 a == _
I P^^S to iogg3 3a- '^gq^ ^ iOi^t,!^ Gross Source Range, cpm:
Technician
All counts times are one minute.
Date By Background Counts (1 min. each) Source Counts (1 min. each) ok?
Y/N
Date By
#1 #2 #3 Avg. #1 #2 #3 Average
ok?
Y/N
t37 lo^7(^ y V 10410
^A//i.{ ;
lo-z-^l j D*^4C/ V loai«^ Y t —IX • ••« /
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.
A-2
CHARCOAL CANISTER ANALYSIS SYSTEM
SITE LOCATION: NA/hil^ H > '^[^l^i'no^ .UT"
CLIENT:
System ID:
Scaler S/N: .5'isc.3
Detector S/N: 4 \^3a-
Calibration Check Log
_ Calibration Date: ^ I (O/ t j Due Date: ^ / J i'^
High Voltage: S'^'^ Window: 4.42 Thrshid: 2.20
Source ID/SN: <^5 - <^ 5 Source Activity: S'^^.'^Kp^f
II ^ to l^'^ 3a= to 1^1 Blank Canister Bkgd. Range, cpm: 2 a = I » to _ 1^/ 3a= ^6
Gross Source Range, cpm: 2<y= \00'5l to /^(g^*^ 3q= ^?^3 to
Technician:
All counts times are one minute.
Date By Background Counts (1 min. each) Source Counts (1 min. each) ok?
Y/N
Date By
#1 #2 #3 Avg. #1 #2 #3 Average
ok?
Y/N
1^7 1037c? y - I H-T I 133 iqa lOHUft V 6/i//if ms ^7 I3i t03fn-10-2-B6) 10279
1 IfO lLf(^ tt?&^3 IOS-76 i 0<r/*J y GlilLl tf 137 \3C) /o2J-f7
^•37 IQlio \ oi#i l0Z3n 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.
A-3
CHARCOAL CANISTER ANALYSIS SYSTEM
SITE LOCATION: ^ Kv\e U,\l\ ^ B (<^tncl "V^ j ^ M
CUENT:
Calibration Check Log
System ID: jA-g*) Calibration Date: b/l^/l} Due Date: Cf/f^/l'^
Scaler S/N: 7"^ High Voltage: ^ ^'^'5 Window: 4.42 Thrshid: 2.20
Detector S/N: ^'^33 Source ID/SN: 05-^4 Source Activity: .'h KpC
Blank Canister Bkgd. Range, cpm: 2 cr = I ^ to ^ 3 a = 1 O ^ to ^
2a- to 3a- ^S'^'^ „ \051'^ Gross Soiu-ce Range, cpm:
TechniciaiL"
AU counts times are one minute.
Date By Background Counts (1 min. each) Source Counts (1 min. each) ok?
Y/N
Date By
#1 #2 #3 Avg. #1 #2 #3 Average
ok?
Y/N
157 (0-23-^ y if/iOjil 1 133 -IO.-3OT-- it?3/3 lO'25|3 to3c'3 y .3<^ 13-7 - 103-7^ lc?33^ V U7i)'h\ • y 151. 1035-5 XO^'O y W12./II i (0373 V 10<^30 Jo3i^/^ 7
Y/N: Y = average background and source cpm fells withm the control limits.
N = average backgrotmd and source cpm does not fall within the control hmits.
The acceptable ranges were determined from prior background and source check data.
A-4
CHARCOAL CANISTER ANALYSIS SYSTEM
SITE LOCATION: H^^"^ KUt^ 'glWt'Hg , U,T
CLIENT: H TM^/^) Car^-
Calibration Check Log
System ID: M ^ / t> ) CaUbration Date: DuePate:
Scaler S/N: 6 1 '5 7*^ High Voltage: I ^"i^S Window: 4.42 Thrshid: 2.20
Detector S/N: ^ I 3 Source ID/SN: - <^ Source Activity: ^
Blank Canister Bkgd. Range, cpm: 2 a = _ 11^ to 3q= to
to Gross Source Range, cpm: 2a = _L£l35^to (C75^5" 3a= loo-^3 ^ 10^7
Technician:
All counts times are one minute.
Date By Background Counts (1 min. each) Source Counts (1 min. each) ok?
Y/N
Date By
#1 #2 #3 Avg. #1 #2 #3 Average
ok?
Y/N
lOtf-^O y ' '3<? 111 1036^7 ic?^7 y W''In \ fO-^12-10^-2/? V 103"^ 7
17-7 |c»^37 1(0(4^/ y
(^/i^/ii 1-2,7 f03/5 /bif7.0
/
Y/N: Y = average background and source cpm falls wiihin 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.
A-5
BALANCE OPERATION DAILY CHECK
Balance Model:
standard Weight fg): Zl.0O»0
Date Pre-check (g) Post-check (g) O.K. ± 0.1 % ? By
i
u/i\/\)
I
i
A-6
Appendix B
Recoimt Data Analyses
CLIENT DENISON MINES PROJECT: RADON FLUX MEASUREMENTS, WHITE MESA MILL PROJECT NO.; 11004.00
PILE: 2 BATCH: M SURFACE: SOIL
AREA: COVER DEPLOYED: 6 8 11 RETRIEVED:
FIELD TECHNICIANS: WM.MCJE.DLC COUNTED BY: DLC
COUNTING SYSTEM I.D.: M01/D21, M02/D20 CAL. DUE; 6/10/12
AIR TEMP MIN;43°F
6 9 11 CHARCOAL BKG:
DATA ENTRY BY: DLC
WEATHER; NO RAIN
145 cpm Wt. Out; 180.0 g.
TARE WEIGHT 29.2 g.
RECOUNT CANISTER ANALYSIS:
GRID SAMPLE i ,| RETRIV ANALYSIS MID.TIME CNT GROSS GROSS RADON ± LLD PRECISIONl
LOCATION
™ ^ ^ ^
LD. HR MIfl HR mm MO DA YR HR iVilN (IVIIN) COUNTS WTIN pCi/m's pCi/m's pCi/m s %RPD 1
M10 M10 11 0 11 9 6 11 11 7 46 1 6448 214.0 12.3 1.2 0.04
RECOUNT M10 11 0 11 9 6 12 11 11 20 1 5244 214.0 12.3 1.2 0.04 0.0%
M20 M20 11 17 11 19 6 11 11 7 54 1 22220 210.1 43.3 4.3 0.04
RECOUNT M20 11 17 11 19 6 12 11 11 20 17929 210.1 42.9 4.3 0.04 0.9%
MSO
RFCni INT
MSO
M?n
11
11
6
R
11
11
9
q
6
a 11 11
1 i
8
11
0
91
22980 214.6
91/1 R
44.9
Al^ fi
4.5
A fi
0.04
n r\A 1 c;o/ r\ 1 w \^ w 1N 1
M40 M40 11 26
1 1
11 19
o
6
1 z.
11
1 1
11
1 1
8
Z 1
7 14445 212.4
HO.O
28.3 2.8
U.U4
0.04
I.Oyo
RECOUNT M40 11 26 11 19 6 12 11 11 21 11758 212.4 28.2 2.8 0.04 0.4%
M50 MSO 11 S5 11 39 6 11 11 8 15 1 6039 209.0 11.5 1.2 0.04
RECOUNT M50 11 S5 11 39 6 12 11 11 22 1 4937 209.0 11.5 1.2 0.04 0.0%
M60 M60 11 49 11 49 6 11 11 8 24 2 1464 216.2 1.2 0.1 0.04
RECOUNT M60 11 49 11 49 6 12 11 11 23 2 1161 216.2 1.1 0.1 0.04 8.7%
M70 M70 11 53 11 53 6 11 11 8 32 1 4195 212.3 8.0 0.8 0.04
RECOUNT M7G 11 53 11 53 6 12 11 11 25 1 3393 212.3 7.8 0.8 0.04 2.5% RECOUNT M7G 11 53 11 53 12 11 11 25 1 3393 212.3 7.8 0.8
MSG MSO 11 56 11 54 6 11 11 8 45 S 1084 211.1 0.4 0.0 0.04
RECOUNT MSO 11 56 11 54 6 12 11 11 27 4 1220 211.1 0.4 0.1 0.04 0.0%
M90 M90 12 11 12 16 6 11 11 8 57 4 1085 209.3 0.2 0.0 0.04
RECOUNT M90 12 11 12 16 6 12 11 11 32 5 1081 209.3 0.2 0.0 0.04 0.0%
Ml 00 M100 12 15 12 19 6 11 11 9 14 2 1345 208.6 1.0 0.1 0.04
RECOUNT M100 12 15 12 19 6 12 11 11 31 2 1084 208.6 1.0 0.1 0.04 0.0%
AVERAGE PERCENT PRECISION FOR THE CELL 2 COVERED REGION: 1.4%
Page 1 of 1
B-1
CUENT DENISON MINES PROJECT; RADON FLUX MEASUREMENTS, WHITE MESA MILL PROJECT NO.; 11004.00
PILE; 3 BATCH; I SURFACE: TAILINGS
AREA; BEACH DEPLOYED; 6 6 11 RETRIEVED; 6
FIELD TECHNICIANS; WM.MCJE.DLC COUNTED BY; DLC
COUNTING SYSTEM I.D.; M01/D21, M02/D20 CAL DUE; 6/10/12
AIR TEMP MIN; 58^
7 11 CHARCOAL BKG;
DATA ENTRY BY; DLC
WEATHER; NO RAIN
139 cpm WtOut; 180.0 g.
TARE WEIGHT; 29.2 g.
RECOUNT CANISTER ANALYSIS;
GRID
LOCATION 1
SAMPLE
LD. HR MIN
RETRIV ANALYSIS
HR MIN MO DA YR
MID-TIME
HR MIN
CNT GROSS
(MIN) COUNTS
GROSS
VVTIN^^^^^i:
RADON ±
pCi/m^s pCi/m^s
LLD
pCI/m s
PRECISION
% RPD ,
K10 K10 ,8 39 8 34 6 11 11 9 26 1 4836 216.2 13.7 1.4 0.05
RECOUNT K10 8 39 8 34 6 12 11 11 55 1 4000 216.2 13.8 1.4 0.06 0.7%
K20
RECOUNT
K20
K20
8
8
47
47
8
8
41
41
6
6
11
12
11
11
9
11
33
55
1 11503
1 9524
216.9
216.9
33.3 3.3
33.5 3.4
0.05
0.06 0.6%
K30 K30 8 58 8 47 6 11 11 9 39 1 6806 217.0 19.6 2.0 0.05
RECOUNT K30 8 58 8 47 6 12 11 11 56 1 5788 217.0 20.3 2.0 0.06 3.5%
K40
RECOUNT
K40
K40
9
9
5
5
9
9
0
0
6
6
11
12
11
11
9
11
47
56
1 4843
1 4053
214.4
214.4
13.7 1.4
13.9 1.4
0.05
0.06 1.4%
K5G 9 12 9 5 6 11 11 9 54 1 4094 215.5 11.6 1.2 0.05
RECOUNT K50 9 12 9 5 6 12 11 11 58 1 3302 215.5 113 11 0.06 2.6% RECOUNT K50 9 12 9 5 6 12 11 11 58 1 3302 215.5 1 1 • O l.l 2.6%
K60
RECOUNT
K60
K60
9
9
23
23
9
9
25
25
6
6
11
12
11
11
10
11
1
58
1 23888
1 19811
214.0
214.0
69.0 6.9
69.5 7.0
0.05
0.06 0.7%
K70 K70 9 18 9 20 6 11 11 10 14 1 14835 221.7 42.8 4.3 0.05
RECOUNT K70 9 18 9 20 6 12 11 11 59 1 12591 221.7 44.2 4.4 0.06 3.2%
K80
RECOUNT
K80
K80
8
8
52
52
8
8
44
44
6
6
11
12
11
11
10
11
21
59
1 5480
1 4580
224.1
224.1
15.7 1.6
15.9 1.6
0.05
0.06 1.3%
K90 K90 8 44 8 39 6 11 11 10 28 1 6476 219.3 18.7 1.9 0.05
RECOUNT K90 8 44 8 39 6 12 11 12 1 1 5468 219.3 1Q 1 1 Q 0.06 2.1% RECOUNT K90 8 44 8 39 6 12 11 12 1 1 5468 219.3 1 9. 1 1.9 0.06 2.1%
K100 KlOO 8 35 8 34 6 11 1
RECOUNT KlOO 8 35 8 34 6 12 1
10 36
12 1
5414
4540
221.2
221.2
15.5
15.7
1.6
1.6
0.05
0.06 1.3%
AVERAGE PERCENT PRECISION FOR THE CELL 3 BEACH REGION: 1.8%
Page 1 of 1
B-2
CLIENT DENISON MINES PROJECT; RADON FLUX MEASUREMENTS, WHITE MESA MILL PROJECT NO.; 11004.00
PILE; 3 BATCH; L SURFACE; SOIL
AREA; COVER DEPLOYED; 6 7 11 RETRIEVED;
FIELD TECHNICIANS; WM,MC,TE,DLC COUNTED BY; DLC
COUNTING SYSTEM I.D.; M01/D21, M02/D20 CAL DUE; 6/10/12
AIR TEMP MIN; 42°F
6 8 11 CHARCOAL BKG;
DATA ENTRY BY; DLC
WEATHER: NO RAIN
143 cpm Wt. Out; 180.0 g.
TARE WEIGHT 29.2 g.
RECOUNT CANISTER ANALYSIS:
GRID SAMPLE RETRIV ANALYSIS MID-TIME CNT GROSS GROSS RADON LLD PRECISION
LOCATION 1. D. HR MIN HR MIN MO DA YR HR MIN (MIN) :OUNTS WTIN pCifm^s pCi/m^s pCi/m^s .. ^.%RPD.ii
L10 L10 9 25 9 43 6 10 11 19 51 1 4965 212.1 10.4 1.0 0.04
RECOUNT L10 9 25 9 43 6 11 11 6 42 1 4462 212.1 10.1 1.0 0.04 2.9%
L20 L20 9 33 9 46 6 10 11 19 59 1529 216.7 3.0 0.3 0.04
RECOUNT L20 9 33 9 46 6 11 11 6 42 1390 216.7 2.9 0.3 0.04 3.4%
LSO
RECOUNT
LSO
LSO
9
9 56
56
9
9 49
49
6
5 10
11
11
11
20
6
17
44
2630
2348
211.9
211.9
5.4
*i 9
0.5
n R
0.04
n na ? ft%
L40 L40 10 23 10 10 6 10 11 20 25 4174 211.4
o.z
8.9 0.9 0.04
o.o /o
RECOUNT L40 10 23 10 10 6 11 11 6 44 3685 211.4 8.4 0.8 0.04 5.8%
m L50 10 34 10 9 6 10 11 20 33 1 6627 212.6 14.4 1.4 0.04
RECOUNT L50 10 34 10 9 6 11 11 6 46 1 5935 212.6 13.9 1.4 0.04 3.5%
L60 L60 10 42 10 19 6 10 11 20 43 2 1359 210.1 1.2 0.1 0.04
RECOUNT L60 10 42 10 19 6 11 11 6 47 2 1240 210.1 1.1 0.1 0.04 8.7%
L70 L70 10 50 10 27 6 10 11 20 52 1 3387 208.8 7.2 0.7 0.04
RECOUNT L70 10 50 10 27 6 11 11 6 51 1 3137 208.8 7.2 0.7 0.04 0.0%
LSO LSO 10 58 10 37 6 10 11 21 1 2 1850 212.3 1.7 0.2 0.04
RECOUNT LSO 10 58 10 37 6 11 11 6 53 2 1812 212.3 1.8 0.2 0.04 5.7%
L90 L90 11 18 11 8 6 10 11 21 12 2 1112 210.4 0.90 0.1 0.04
RECOUNT L90 11 18 11 8 6 11 11 6 57 3 1499 210.4 0.84 0.1 0.04 6.9%
L100 L100 11 4 11 9 6 10 11 21 22 1 5379 211.7 11.4 1.1 0.04
RECOUNT L100 11 4 11 9 6 11 11 6 56 1 4675 211.7 10.6 1.1 0.04 7.3%
AVERAGE PERCENT PRECISION FOR THE CELL 3 COVERED REGION: 4.8%
Page 1 of 1
B-3
Appendix C
Radon Flux Sample Laboratory Data (including Blanks)
CLIENT DENISON MINES PROJECT; RADON FLUX MEASUREMENTS, WHITE MESA MILL PROJECT NO.; 11004.00
PILE; 2 BATCH; M SURFACE; SOIL AIR TEMP MIN; 43°F
AREA; COVER DEPLOYED; 6 8 11 RETRIEVED; 6 9 11 CHARCOAL BKG:
FIELD TECHNICIANS; WM,MC,TE,DLC COUNTED BY; DLC DATA ENTRY BY; DLC
COUNTING SYSTEM I.D.; M01/D21, M02/D20 CAL DUE; 6/10/12
WEATHER; NO RAIN
145 cpm WtOut; 180.0 g.
TARE WEIGHT; 29.2 g.
GRID SAMPLE DEPLOY RETRIV ANALYSIS MID-TIME CNT GROSS GROSS RADON ± LLD
LOCATION I D. HR MIfi HR MIN MO DA YR HR MIN (MIN) COUNTS WTIN i pCj/m% pCI/m^s pCI/m s
M01 M01 10 47 11 0 6 11 11 7 38 1 2428 212.2 4.5 0.4 0.04
M02 M02 10 48 11 1 6 11 11 7 38 1 2213 209.8 4.0 0.4 0.04
MOS MOS 10 49 11 2 6 11 11 7 40 2 1081 216.7 0.8 0.1 0.04
M04 M04 10 SO 11 3 6 11 11 7 40 1 4717 211.1 8.9 0.9 0.04
M05 MOS 10 52 11 4 6 11 11 7 42 1 1057 213.4 1.8 0.2 0.04
MQ6 M06 10 SS 11 5 6 11 11 7 43 2 10S6 210.7 0.7 0.1 0.04
M07 M07 10 55 11 6 6 11 11 7 44 1 2681 214.0 5.0 0.5 0.04
MOS
M09
MOS
M09
10
10
11
56
58
0
11 7
11 8
11 9
6
6
6
11 11
11 11
11 11
7
7
45
46
46
1 4268
1 1406
1 6448
216.2
211.3
214.0
8.0
2.5
12.3
0.8
0.2
1.2
0.04
0.04
0.04 M10 M10
10
10
11
56
58
0
11 7
11 8
11 9
6
6
6
11 11
11 11
11 11 7
45
46
46
1 4268
1 1406
1 6448
216.2
211.3
214.0
8.0
2.5
12.3
0.8
0.2
1.2
0.04
0.04
0.04
M11 M11 11 1 11 10 6 11 11 7 48 2 1011 213.4 0.7 0.1 0.04
M12
M13
M12
MIS
11
11
S
5
11 11
11 12
6
6
11 11
11 11
11 11
7
7
48
50
1 5370
1 6810
214.2
211.9
10.2
13.1
5.0
1.0
1.3
0.5
0.04
0.04
0.04 M14 M14 11 6 11 13 6
11 11
11 11
11 11 7 50 1 2690 211.7
10.2
13.1
5.0
1.0
1.3
0.5
0.04
0.04
0.04
M15 MIS 11 7 11 14 6 11 11 7 51 1 1790 111.9 3.2 0.3 0.04
M16 M16 11 9 11 15 6 11 11 7 51 1 6124 209.8 11.7 1.2 0.04
M17 M17 11 11 11 16 6 11 11 7 52 1 9993 205.3 19.3 1.9 0.04
M18 M18 11 13 11 17 6 11 11 7 52 1 7201 208.4 13.8 1.4 0.04
M19 M19 11 15 11 18 6 11 11 7 54 1 12482 210.0 24.3 2.4 0.04
M20 M20 11 17 11 19 6 11 11 7 54 1 22220 210.1 43.3 4.3 0.04
M21 M2t 10 50 11 0 6 11 11 7 55 1 4039 212.3 7.6 0.8 0.04
M22 M22 10 52 11 1 6 11 11 7 55 1 76358 213.7 149.2 14.9 0.04
M23 M23 10 53 11 2 6 11 11 7 56 1 1025 211.1 1.7 0.2 0.04
M24 M24 10 55 11 S 6 11 11 7 56 1 5807 213.6 11.1 1.1 0.04
M2§ M2S 10 58 11 4 6 11 11 7 58 1 14541 213.7 28.3 2.8 0.04
M26 M26 10 59 11 5 6 11 11 7 58 1 2281 214.2 4.2 0.4 0.04
M27 M27 11 2 11 6 6 11 11 7 59 1 14133 212.5 27.5 2.8 0.04
M28 M28 11 4 11 7 6 11 11 7 59 1 21963 211.0 42.9 4.3 0.04
M29 M29 11 5 11 8 6 11 11 8 0 1 15467 215.1 30.2 3.0 0.04
MSO MSO 11 6 11 9 6 11 11 8 0 1 22980 214.6 44.9 4.5 0.04
Page 1 of 4
C-1
CUENT DENISON MINES PROJECT; RADON FLUX MEASUREMENTS, WHITE MESA MILL PROJECT NO.; 11004.00
PILE: 2 BATCH; M SURFACE; SOIL AIR TEMP MIN; 43°F
AREA; COVER DEPLOYED; 6 8 11 RETRIEVED; 6 9 11 CHARCOAL BKG;
FIELD TECHNICIANS; WM,MC,TE,DLC COUNTED BY; DLC DATA ENTRY BY; DLC
COUNTING SYSTEM I.D.; M01/D21, M02/D20 CAL. DUE: 6/10/12
WEATHER; NO RAIN
145 cpm WtOut; 180.0 g.
TARE WEIGHT 29.2 g.
GRID SAMPLE DEPLOY RETRIV ANALYSIS MID-TIME CNT GROSS GROSS RADON ± LLD
LOCATION LD. MIN HR MIN MO DA YR HRj: Mii) (MIN):?OUNTS •..WT.INJI pCi7m^s pCi/m^s pCj/m
MSI MSI 11 8 11 10 6 11 11 8 2 1 26227 211.1 51.4 5.1 0.04
MS2 M32 11 9 11 11 6 11 11 8 2 1 40958 212.2 80.2 8.0 0.04
M33 M33 11 11 11 12 6 11 11 8 3 1 22355 213.0 43.8 4.4 0.04
M34 M34 11 13 11 13 6 11 11 8 3 1 1002 212.7 1.7 0.2 0.04
M35 M35 11 15 11 14 6 11 11 8 4 1 1433 210.9 2.5 0.3 0.04
MSO M36 11 18 11 15 6 11 11 8 4 1 9215 211.8 17.9 1.8 0.04
M37 MS7
RJIOO
11 20 11 16
-1 "7
6
c
11 11 8
Q
6 10613
•i OQQO
210.1
o ^ 1 fl
20.7
07 -1
2.1
O 7
0.04
n r\A Moo
M39
Moo
M39
11
11
ZZ
23
11
11
1 /
18
b
6
11 11
11 11
O
8
b
7 ] 1 oooZ
18799
zio.y
212.1
Zl .1
36.9
Z. 1
3.7
U.U4
0.04
M40 M40 11 26 11 19 6 11 11 8 7 1 14445 212.4 28.3 2.8 0.04
M41 M41 11 19 11 20 6 11 11 8 9 1309 215.7 1.0 0.1 0.04
M42 M42 11 21 11 21 6 11 11 8 9 1 13457 214.4 26.2 2.6 0.04
M4S M43 11 23 11 22 6 11 11 8 11 1 4007 211.3 7.6 0.8 0.04
M44 M44 11 25 11 23 6 11 11 8 11 1 6360 210.3 12.2 1.2 0.04
M45 M45 11 26 11 24 6 11 11 8 12 1 14647 212.5 28.6 2.9 0.04
M46 M46 11 28 11 35 6 11 11 8 12 1 16769 213.2 32.5 3.3 0.04
M47 M47 11 30 11 36 6 11 11 8 13 1 1001 217.2 1.7 0.2 0.04
M48 M48 11 32 11 37 6 11 11 8 13 1 1076 211.8 1.8 0.2 0.04
M49 M49 11 34 11 38 6 11 11 8 15 1 1331 207.8 2.3 0.2 0.04
MSO MSO 11 35 11 39 6 11 11 8 15 1 6039 209.0 11.5 1.2 0.04
M51 M51 11 37 11 40 6 11 11 8 16 1 13015 211.3 25.3 2.5 0.04
M52 M52 11 38 11 41 6 11 11 8 16 1 3765 209.9 7.1 0.7 0.04
M53 M53 11 40 11 42 6 11 11 8 17 1 20323 213.9 39.7 4.0 0.04
M54 M54 11 41 11 43 6 11 11 8 17 1 34372 210.0 67.1 6.7 0.04
M55 M55 11 42 11 44 6 11 11 8 19 1 3698 214.6 7.0 0.7 0.04
M56 M56 11 43 11 45 6 11 11 8 19 1 17398 212.5 33.8 3.4 0.04
M67 M57 11 44 11 46 6 11 11 8 21 1 120157 212.1 236.1 23.6 0.04
M58 11 46 11 47 6 11 11 8 22 2 1265 210.3 1.0 0.1 0.04
M59 M59 11 47 11 48 6 11 11 8 24 2 1076 212.4 0.8 0.1 0.04
M60 M60 11 49 11 49 6 11 11 8 24 2 1464 216.2 1.2 0.1 0.04
Page 2 of 4
C-2
CUENT DENISON MINES PROJECT; RADON FLUX MEASUREMENTS, WHITE MESA MILL PROJECT NO.; 11004.00
PILE 2 BATCH; M SURFACE; SOIL AIR TEMP MIN: 43°F
AREA: COVER DEPLOYED; 6 8 11 RETRIEVED; 6 9 11 CHARCOAL BKG;
FIELD TECHNICIANS; WM,MC,TE,DLC COUNTED BY: DLC DATA ENTRY BY: DLC
COUNTING SYSTEM I.D.; M01/D21, M02/D20 CAL DUE; 6/10/12
WEATHER: NO RAIN
145 cpm Wt. Out; 180.0 g.
TARE WEIGHT; 29.2 g.
GRID SAMPLE DEPLOY RETRIV ANALYSIS MID-TIME CNT GROSS GROSS RADON ± LLD
LOCATION LD. HRI MIN HR MIN MO DA YR HR MIN (MIN) COUNTS , WT,INi| . pCi/m^^l pCi/m^s pCi/m'
M61 M61 11 35 11 20 6 11 11 8 26 1 1181 213.7 2.1 0.2 0.04
M62 M62 11 36 11 21 6 11 11 8 26 1 4696 209.3 9.1 0.9 0.04 M62 M62 11 36 11 21 6 11 11 8 26 ' 4696 209.3 9.1 0.9 0.04
M6S M6S 11 37 11 22 6 11 11 8 28 1471 209.2 1.2 0.1 0.04
M64 M64 11 38 11 23 6 11 11 8 28 1 10691 214.2 21.0 2.1 0.04
M65 M65 11 39 11 24 11 11 8 30 11451 209.7 22.6 M65 M65 11 39 11 24 6 11 11 8 30 1 11451 209.7 22.6 2.3 0.04
M66 M66 11 40 11 45 6 11 11 8 30 1 16771 215.1 32.6 S.S 0.04
M67 M67 11 50 11 47 6 11 11 8 31 1 9184 214.0 17.9 1.8 0.04
M68
M69
M68
M69
11
11
51
52
11
11
49
51
6
6
11 11
11 11
8
8
31
32 ] 1032
, 1104
212.5
213.9
1.7
1.9
0.2
0.2
0.04
0.04
M70
M71
M70
M71
11
11
53
54
11
11
53
54
6
6
11 11
11 11
8
8
32
34 ] 4195
14204
212.3
212.5
8.0
27.7
0.8
2.8
0.04
0.04
M72 M72 11 55 11 55 6 11 11 8 34 1 13030 206.1 25.S 2.5 0.04
M7S M7S 11 56 11 56 6 11 11 8 35 1 4248 212.4 8.1 0.8 0.04
M74 M74 11 57 11 57 6 11 11 8 35 1 34365 213.7 67.2 6.7 0.04
M75 M75 11 57 11 59 6 11 11 8 37 1 6672 211.3 12.8 1.3 0.04
M76 M76 11 58 12 0 6 11 11 8 38 1091 211.7 0.8 0.1 0.04
M77 M77 11 50 11 51 6 11 11 o 40 14773 208.5 28.8 2.9 n r\A M77 M77 11 50 11 51 6 11 11 o 40 14773 208.5 28.8 2.9 U.U4
M78 M78 11 52 11 52 6 11 11 8 41 1342 210.7 1.0 0.1 0.04
M79 M79 11 54 11 53 6 11 11 8 43 1 1598 210.4 2.9 0.3 0.04
MSO MSO 11 56 11 54 6 11 11 8 45 1084 211.1 0.4 0.0 0.04
M81 M81 11 58 11 55 6 11 11 8 46 1700 210.2 1.4 0.1 0.04
M82 M82 12 0 11 56 6 11 11 8 48 6716 211.5 13.0 1.3 0.04 M82 M82 0 11 56 11 11 48 6716 211.5 13.0 1.3 0.04
M8S M83 12 2 11 57 6 11 11 8 48 1 5250 211.9 10.1 1.0 0.04
M84 M84 12 4 11 58 6 11 11 8 49 1 6470 215.0 12.5 1.2 0.04
M85 M85 12 6 11 59 6 11 11 8 50 1 2614 211.7 4.9 0.5 0.04
M86 M86 12 8 12 0 6 11 11 8 51 2478 215.5 4.6 0.5 0.04 M86 M86 12 8 12 0 6 11 11 8 51 2478 215.5 4.6 0.5 0.04
M87 M87 12 2 12 2 6 11 11 8 52 1 1109 214.1 1.9 0.2 0.04
M88 M88 12 1 12 1 6 11 11 8 52 1 3225 209.0 6.1 0.6 0.04
M89 M89 12 9 12 15 6 11 11 Q 54 i 2173 214.1 4.0 0.4 0.04 M89 M89 12 9 12 15 6 11 11 O 54 2173 214.1 4.0 0.4 0.04
M90 M90 12 11 12 16 6 11 11 8 57 4 1185 209.S 0.3 0.0 0.04
Page 3 of 4
C-3
CUENT: DENISON MINES PROJECT: RADON FLUX MEASUREMENTS, WHITE MESA MILL PROJECT NO.: 11004.00
PILE 2 BATCH; M SURFACE: SOIL
AREA; COVER DEPLOYED; 6 8 11 RETRIEVED; 6
FIELD TECHNICIANS: WM,MC,TE,DLC COUNTED BY; DLC
COUNTING SYSTEM I.D.: M01/D21, M02/D20 CAL DUE: 6/10/12
AIR TEMP MIN; 43°F
9 11 CHARCOAL BKG;
DATA ENTRY BY: DLC
WEATHER; NO RAIN
145 cpm WtOut 180.0 g.
TARE WEIGHT; 29.2 g.
GRID SAMPLE DEPLOY RETRIV ANALYSIS MID-TIME CNT GROSS GROSS RADON ± LLD 1
LOCATION « LD. HR MIN HR MIN MO DA YR HR MIN (MIN) COUNTS WTIN pCi/m*s pCi/m^s pCi/nv's COMMENTS:
M91 M91 12 IS 12 14 6 11 11 9 2 4 1063 209.0 0.2 0.0 0.04
M92 M92 12 12 12 11 6 11 11 9 0 1 1710 214.8 3.1 0.3 0.04
M93 M93 12 12 12 9 6 11 11 9 6 2 1833 208.3 1.5 0.2 0.04
M94 Mg4 12 10 12 7 6 11 11 9 6 2 1076 211.4 0.8 0.1 0.04
Mg5 Mgs 12 9 12 5 6 11 11 9 9 1 1307 210.6 2.3 0.2 0.04
M96 M96 12 8 12 3 6 11 11 9 9 1 14647 216.3 28.7 2.9 0.04
M97 M97 12 13 12 13 6 11 11 9 11 1 3253
oooo
216.8
o -t r> •?
6.1
fi A
0.6
n fi
0.04
n r\A M98
M99
M98
M99
12
12
12
13
12
12
17
18
6 11 11
6 11 11
9
9
11
14
1
2
oZbo
1344
ZiU.f
213.6
b.l
1.0
U.b
0.1
U.U4
0.04
M100 M100 12 15 12 19 6 11 11 9 14 2 1345 208.6 1.0 0.1 0.04
AVERAGE RADON FLUX RATE FOR THE CELL 2 COVERED REGION: 18.0 pCi/m^s
BLANK CANISTER ANALYSIS;
GRID SAMPLE RETRIV ANALYSIS MID-TIME CNT GROSS GROSSl RADON ± LLD
LOCATION LD. HR MIN HR MIN MODA YR HR MIN (MIN) :OUNTS ..-.WT iN-:l pCi/m=s palm's pCi/m'S COMMENTS;
M BLANK 1 M BLANK 1 10 41 10 50 6 10 11 18 15 10 1679 208.4 0.04 0.02 0.03 CONTROL
M BLANK 2 M BLANK 2 10 41 10 50 6 10 11 18 15 10 1593 209.7 0.03 0.02 0.03 CONTROL
M BLANKS M BLANK 3 10 41 10 50 6 10 11 18 26 10 1740 213.2 0.05 0.02 0.03 CONTROL
M BLANK 4 M BLANK 4 10 41 10 50 6 10 11 18 26 10 1620 207.6 0.03 0.02 0.03 CONTROL
M BLANK 5 M BLANK 5 10 41 10 50 6 10 11 18 38 10 1696 207.9 0.04 0.02 0.03 CONTROL ••
AVERAGE BLANK CANISTER ANALYSIS FOR THE CELL 2 COVERED REGION: 0.04 pCi/m^s
Page 4 of 4
C-4
CUENT; DENISON MINES PROJECT: RADON FLUX MEASUREMENTS, WHITE MESA MILL PROJECT NO.: 11004.00
PILE 3 BATCH; I SURFACE; TAIUNGS AIR TEMP MIN; 58°F
AREA; BEACH DEPLOYED; 6 6 11 RETRIEVED; 6 7 11 CHARCOAL BKG;
FIELD TECHNICIANS; WM,MC,TE,DLC COUNTED BY; DLC DATA ENTRY BY; DLC
COUNTING SYSTEM I.D.; M01/D21, M02/D20 CAL DUE; 6/10/12
WEATHER: NO RAIN
139 cpm WtOut; 180.0 g.
TARE WEIGHT 29.2 g.
GRID SAMPLE DEPLOY RETRIV ANALYSIS MID-TIME CNT GROSS GROSS RADON + LLD
LOCATION LD. HR MIN HR MIN MO DA YR HR MIN (MIN) COUNTS WTIN pCi/m^s pCi/m^s pCUm's COMMENTS:
KOI K01 8 32 8 30 6 11 11 9 21 1 5553 219.0 15.8 1.6 0.05 KOI K01 8 32 8 30 11 11 21 1 5553 1.6 0.05
K02 K02 8 32 8 SO 6 11 11 9 21 1 7340 212.6 21.0 2.1 0.05
K03 K03 8 33 8 31 6 11 11 9 22 1 9255 212.3 26.7 2.7 0.05
K04 K04 8 34 8 31 6 11 11 9 22 1 11114 213.3 32.1 3.2 0.05
K05 K05 8 35 8 32 6 IT 11 9 23 1 7247 219.9 20.8 2.1 0.05
K06 K06 8 36 8 32 6 11 11 9 23 1 6541 216.1 18.7 1.9 0.05
K07 K07 8 37 8 33 6 11 11 9 25 1 9014 219.8 26.0 2.6 0.05
K08
K09
K08
K09
8
8
CO
m

8
8
S3
34
6
6
11 11
11 11
9
9
25
26
1 11529
1 4731
216.6
214.0
33.3
13.5
3.3
1.3
0.05
0.05 i
K10 K10 8 39 8 34 6 11 11 9 26 1 4836 216.2 13.7 1.4 0.05 f
K11 K11 8 40 8 35 6 11 11 9 27 1 16007 215.7 46.5 4.7 0.05
K12 K12
K13
8 40 8 36 6 11 11 9 27 1 19267 217.5 55.9 5.6 0.05
K13
K12
K13 8 41 8 37 6 11 11 9 29 1 8853 215.0 25.5 2.6 0.05 )M
.K14 K14 8 42 8 37 6 11 11 9 29 t 9190 217.9 26.5 2,6 0.05
K15 K15 8 43 8 38 6 11 11 9 30 1 22681 214.0 66.1 6.6 0.05
K16 K16 8 44 8 38 6 11 11 9 SO 1 10967 216.8 31.7 3.2 0.05
K17 K17 8 45 8 39 6 11 11 9 31 1 7083 212.4 20.4 2.0 0.05 1
K18 K18 8 45 8 40 6 11 11 9 31 1 30211 217.2 87.9 8.8 0.05 i K18 K18 8 45 8 40 6 11 11 9 31 1 30211 8.8 0.05 i
K19 K19 8 46 8 40 6 11 11 9 33 1 14069 212.6 40.9 4.1 0.05
K20 K20 8 47 8 41 6 11 11 9 33 1 11503 216.9 33.3 3.3 0.05
K21 K21 8 47 8 41 6 11 11 9 34 1 5282 216.4 15.1 1.5 0.05 i
^2 K22 8 48 8 42 6 11 11 9 34 1 14661 221.8 42.5 42::.,
K23 K23 8 48 8 42 6 11 11 9 35 1 8227 216.8 23.7 2.4 0.05
K24 K24 8 49 8 43 6 11 11 9 35 1 8914 215.1 25.7 2.6 0.05
K2S K25 8 50 8 43 6 11 11 9 37 1 10644 208.7 30.9 3.1 0.05 .1
K26 K26 8 56 8 43 6 11 11 9 37 1 5107 216.8 14.6 1.5 0.05 •;JI=
K27 K27 8 56 8 44 6 11 11 9 38 1 10322 218.1 30.0 3.0 0.05
K28 K28 8 57 8 45 6 11 11 9 38 1 10067 217.7 29.2 2.9 0.05
K2g K29 a 57 8 46 6 11 11 9 39 1 9493 210.0 27.5 2.8 0.05
K30 8 o 47 11 11 9 39 t 6806 217.0 2.0 0,05 K30 8 ^6 0 47 Q 11 11 9 39 t 6806 217.0 2.0 0,05
Page 1 of 4
C-5
CUENT; DENISON MINES PROJECT: RADON FLUX MEASUREMENTS, WHITE MESA MILL PROJECT NO.: 11004.00
PILES BATCH; I SURFACE; TAIUNGS AIR TEMP MIN; 58^
AREA: BEACH DEPLOYED; 6 6 11 RETRIEVED: 6 7 11 CHARCOAL BKG:
FIELD TECHNICIANS: WM.MCJE.DLC COUNTED BY; DLC DATA ENTRY BY; DLC
COUNTING SYSTEM I.D.; M01/D21, M02/D20 CAL. DUE; 6/10/12
WEATHER: NO RAIN
139 cpm WtOut; 180.0 g.
TARE WEIGHT; 29.2 g.
GRID SAMPLE DEPLOY RETRIV ANALYSIS MID--TIME CN T GROSS GROSS RADON ± LLD
LOCATION 1. D. HR Mll|f HR MIN MODA YR HRi MIN (MIN):OUNTS .WTIN it pCi/m^s pCI/m^s pCilm'
K31 KS1 8 59 8 48 6 11 11 9 41 1 5850 213.8 16.8 1.7 0.05
K32 K32 9 0 8 49 6 11 11 9 41 1 7204 213.5 20.7 2.1 0.05
K33 K33 9 0 8 50 6 11 11 9 42 1 3653 214.5 10.3 1.0 0.05
K34 K34 9 1 8 51 6 11 11 9 42 1 28774 218.2 84.0 8.4 0.05
K35 K35 9 2 8 52 6 11 11 9 43 1 12741 213.2 37.1 3.7 0.05
K36 K36 9 3 8 53 6 11 11 9 43 1 18575 215.6 54.1 5.4 0.05
K37 K37 9 3 8 54 6 11 11 9 45 1 18386 212.9 53.6 5.4 0.05
KS8 K38 9 4 8 55 6 11 11 9 45 1 9720 214.7 28.1 2.8 0.05
KS9 K39 9 4 9 0 6 11 11 9 47 2 1268 208.8 1.4 0.1 0.05
K40 K40 9 5 9 0 6 11 11 9 47 1 4843 214.4 13.7 1.4 0.05
K41 K41 9 5 9 1 6 11 11 9 49 1 4577 217.1 13.0 1.3 0.05
K42 K42 9 6 9 1 6 11 11 9 49 1 8793 224.7 25.3 2.5 0.05
K43 K43 9 7 9 2 6 11 11 9 50 1 10471 220.6 30.3 3.0 0.05
K44 K44 9 8 9 2 6 11 11 9 50 1 5896 219.3 16.8 1.7 0.05
K45 K45 9 9 9 3 6 11 11 9 51 1 36S08 220.8 106.1 10.6 0.05
K46 K46 9 10 9 3 6 11 11 9 51 1 7712 218.1 22.2 2.2 0.05
K47 K47 9 10 9 4 6 11 11 9 53 1 1S527 217.8 S9.S 3.9 0.05
K48 K48 9 11 9 4 6 11 11 9 53 1 10011 215.4 28.9 2.9 0.05
K49 K49 9 11 9 5 6 11 11 9 54 1 12826 217.5 37.2 3.7 0.05
K50 K50 9 12 9 5 6 11 11 9 54 1 4094 215.5 11.6 1.2 0.05
K51 K51 9 SO 9 30 6 11 11 9 55 1 14675 214.1 42.4 4.2 0.05
K52 K52 9 29 9 29 6 11 11 9 55 1 29349 222.1 84.9 8.5 0.05
K53 K53 9 29 9 29 6 11 11 9 57 1 9970 213.4 28.7 2.9 0.05
K54 K54 9 28 9 28 6 11 11 9 57 1 16550 214.0 47.7 4.8 0.05
K55 K55 9 26 9 28 6 11 11 9 58 1 1S864 216.1 40.0 4.0 0.05
K56 K56 9 25 9 27 6 11 11 9 58 1 S5317 219.0 102.2 10.2 0.05
K57 K57 9 24 9 27 6 11 11 9 59 1 1271 217.0 3.3 0.3 0.05
KS8 K58 9 24 9 26 6 11 11 9 59 1 7780 218.0 22.2 2.2 0.05
K59 K59 9 23 9 26 6 11 11 10 1 1 26485 211.8 76.7 7.7 0.05
K60 K60 9 23 9 25 6 11 11 10 1 1 23888 214.0 69.0 6.9 0.05
Page 2 of 4
C-6
CUENT; DENISON MINES PROJECT: RADON FLUX MEASUREMENTS, WHITE MESA MILL PROJECT NO.; 11004.00
PILES BATCH; I SURFACE; TAILINGS AIR TEMP MIN; 58T
AREA; BEACH DEPLOYED; 6 6 11 RETRIEVED; 6 7 11 CHARCOAL BKG;
FIELD TECHNICIANS: WM,MC,TE,DLC COUNTED BY; DLC DATA ENTRY BY: DLC
COUNTING SYSTEM I.D.: M01/D21, M02/D20 CAL DUE; 6/10/12
WEATHER; NO RAIN
139 cpm WtOut: 180.0 g.
TARE WEIGHT 29.2 g.
GRID SAMPLE DEPLOY RETRIV ANALYSIS MID-riME CNT GROSS GROSS RADON ± •••if LLD
LOCATION LD, HR Mllf HR MIN MO DA YR HRi MIN (MIN) COUNTS WTIN pCi/m^s .pCi/m=^ii| pOUm
K61 K61 9 22 9 25 6 11 11 10 2 1 3586 217.4 10.0 1.0 0.05
K62 K62 9 22 9 24 6 11 11 10 2 1 3643 216.9 10.2 1.0 0.05
K6S K63 9 21 9 24 6 11 11 10 7 5 1059 208.7 0.2 0.0 0.05
K64 K64 9 21 9 23 6 11 11 10 4 1 11547 215.5 33.2 3.3 0.05
K65 K65 9 21 9 23 6 11 11 10 11 1 21485 217.8 62.3 6.2 0.05
K66 K66 9 20 9 22 6 11 11 10 11 1 7610 214.9 21.7 2.2 0.05
K67 K67 9 20 9 22 6 11 11 10 13 1 15622 215.8 45.2 4.5 0.05
K68 K68 9 19 9 21 6 11 11 10 13 1 9874 220.0 28.3 2.8 0.05
K6$ K69 9 19 9 21 6 11 11 10 14 1 48169 223.4 140.3 14.0 0.05
K7a K70 9 18 9 20 6 11 11 10 14 1 148S5 221.7 42.8 4.3 0.05
K71 K71 9 18 9 20 6 11 11 10 15 1 7641 22S.5 21.9 2.2 0.05
K72 K72 9 17 9 20 6 11 11 10 15 1 16328 218.3 47.1 4.7 0.05
K73 K73 9 17 9 19 6 11 11 10 17 1 22729 222.7 66.0 6.6 0.05 K73 K73 9 17 9 19 6 11 11 1 22729 222.7 66.0 6.6 0.05
K74 K74 9 16 9 19 6 11 11 10 17 1 12101 223.6 34.8 3.5 0.05
K75 K75 9 16 9 19 6 11 11 10 18 1 6272 220.1 17.9 1.8 0.05
K76 K76 8 54 8 47 6 11 11 10 18 1 16739 217.5 48.8 4.9 0.05
K77 K77 8 53 8 46 6 11 11 10 20 1 6683 216.7 19.3 1.9 0.05
K78 K78 8 53 8 45 6 11 11 10 20 1 4827 211.2 13.8 1.4 0.05
K79 K79 8 52 8 45 6 11 11 10 21 1 8906 214.S 25.9 2.6 0.05
K80 K80 8 52 8 44 6 11 11 10 21 1 5480 224.1 15.7 1.6 0.05
K81 K81 8 51 8 43 6 11 11 10 22 1 1961 218.2 5.4 0.5 0.05
K82 K82 8 51 8 43 6 11 11 10 22 1 6284 217.2 18.1 1.8 0.05
K83 K83 8 50 8 42 6 11 11 10 24 1 4837 213.6 13.9 1.4 0.05
K84 K84 8 49 8 42 6 11 11 10 24 1 13732 211.6 40.1 4.0 0.05
KS5 8 48 8 41 6 11 11 10 26 1 6927 218.8 20.1 2.0 0.05 f 8 48 8 41 6 11 11 10 26 1 6927 218.8 20.1 2.0 0.05
mt KS6 8 47 8 41 6 11 11 10 26 1 5006 221.8 14.3 1.4 0.05
K87 K87 8 47 8 40 6 11 11 10 27 1 3693 213.0 10.5 1.1 0.05
K88 K88 8 46 8 40 6 11 11 10 27 1 5794 216.2 16.7 1.7 0.05
K89 K89 8 45 8 39 6 11 11 10 28 1 3361 219.5 9.5 1.0 0.05
K90 K90 8 44 8 39 6 11 11 10 28 1 6476 219.3 18.7 1.9 0.05
Page 3 of 4
C-7
CUENT; DENISON MINES PROJECT: RADON FLUX MEASUREMENTS, WHITE MESA MILL PROJECT NO.: 11004.00
PILE; 3 BATCH; I SURFACE; TAIUNGS
AREA; BEACH DEPLOYED: 6 6 11 RETRIEVED; 6
FIELD TECHNICIANS; WM,MC,TE,DLC COUNTED BY; DLC
COUNTING SYSTEM I.D.; M01/D21, M02/D20 CAL DUE; 6/10/12
AIR TEMP MIN;58T
7 11 CHARCOAL BKG;
DATA ENTRY BY; DLC
WEATHER; NO RAIN
139 cpm WtOut; 180.0 g.
TARE WEIGHT 29.2 g.
GRID
LOCATION
SAMPLE
LD.
DEPLOY RETRIV
HR MIN HR Mirf
ANALYSIS
MO DA YR
MID-TIME
HR MIN
CNT GROSS
(MIN) COUNTS
GROSS
WT IN il
RADON
pCI/m^s
±
pCf/m^s
LLD
.. pCi/m*'s COMMENTS:
K91
K92
K91
K92
8
8
43
42
8
8
38
38
6
6
11
11 11
10
10
SO
SO ] 1484
8676
225.7
218.8
4.0
25.1
0.4
2.5
0.05
0.05
K93 K93 8 41 8 37 6 11 11 10 31 1 7632 221.9 22.1 2.2 0.05
K94 K94 8 40 8 37 6 11 11 10 31 14328 215.5 41.8 4.2 0.05 K94 K94 8 40 8 37 6 11 10 31 14328 215.5 41.8 4.2 0.05
K95
K96
K97
K95
K96
K97
8
8
8
39
38
38
8
8
8
36
36
35
6
6
6
11
11
11 ii 10
10
10
33
SS
34 ] 1750
2409
2081
213.9
219.2
213.8
4.8
6.7
5.7
0.5
0.7
0.6
0.05
0.05
0.05
K98
K99
KlOO
K98
K99
KlOO
8
8
8
37
36
35
8
8
8
35
34
34
6
6
6
11
11
11 11
10
10
10
34
36
36 ] 3065
16122
5414
214.0
222.7
221.2
8.6
47.2
15.5
0.9
4.7
1.6
0.05
0.05
0.05
AVERAGE RADON FLUX RATE FOR THE CELL 3 BEACH REGION: 31.4 pCI/m^s
BLANK CANISTER ANALYSIS:
GRID SAMPLE •M RETRIV ANALYSIS MID.TIME CNT GROSS GROSS RADON t LLD y
LOCATION LD. HR MIN HR MIN MODA YR HR MIN (MIN) :OUNTS WTIN pCi/m-s pCilms pCi/m^s COMMENTS
K BLANK 1 K BLANK 1 8 26 8 28 6 10 11 17 41 10 1546 209.3 0.04 O.OS 0.05 CONTROL
KBLANK 2 K BLANK 2 8 26 8 28 6 10 11 17 41 10 1601 210.9 0.05 O.OS 0.05 CONTROL
K BLANK 3
K BLANK 4
K BLANK 3
K BLANK 4
8
8
26
26
8
8
28
28
6
6
10
10
11
11
17
17
52
52
10
10
1672
1598
211.9
208.2
0.07
0.05
O.OS
O.OS
0.05
0.05
CONTROL
CONTROL
K BLANK 5 K BLANK 5 8 26 8 28 6 10 11 18 3 10 1623 210.0 0.06 0.03 0.05 CONTROL
AVERAGE BLANK CANISTER ANALYSIS FOR THE CELL 3 BEACH REGION: 0.06 pCi/m's
Page 4 of 4
C-8
CUENT; DENISON MINES PROJECT; RADON FLUX MEASUREMENTS, WHITE MESA MILL PROJECT NO.: 11004.00
PILE 3 BATCH: L SURFACE SOIL AIR TEMP MIN: 42°F
AREA: COVER DEPLOYED; 6 7 11 RETRIEVED: 6 8 11 CHARCOAL BKG:
FIELD TECHNICIANS; WM,MC,TE,DLC COUNTED BY; DLC DATA ENTRY BY; DLC
COUNTING SYSTEM I.D.: M01/D21, M02/D20 CAL DUE: 6/10/12
WEATHER; NO RAIN
143 cpm WlOut; 180.0 g.
TARE WEIGHT; 29.2 g.
GRID SAMPLE DEPLOY RETRIV ANALYSIS MID-TIME CNT GROSS GROSS RADON ± LLD
LOCATION LD, HR MIN HR MIN MO DA YR HR MIN (MIN) COUNTS WTIN pCi/m^s pCi/m* s pCi/m
LOI LOI 9 15 9 40 6 10 11 19 45 1 1418 212.6 2.7 0.3 0.04
L02 t02 9 16 9 40 6 10 11 19 45 1 8646 218.8 18.2 1.8 0.04
LOS LOS 9 18 9 40 6 10 11 19 46 1 2029 210.7 4.1 0.4 0.04
L04 L04 9 20 9 41 6 10 11 19 46 1 6441 208.1 13.5 1.4 0.04
LOS 9 21 9 41 6 10 11 19 47 1 3213 210.2 6.6 0.7 0.04
L06 LOS 9 22 9 41 6 10 11 19 47 1 2214 207.8 4.5 0.4 0.04
L07 L07 9 23 9 42 6 10 11 19 49 1 1007 210.1 1.9 0.2 0.04
LOS LOS 9 24 9 42 6 10 11 19 49 1 3299 210.2 6.8 0.7 0.04
LOS uii 9 25 9 42 6 10 11 19 51 1 3142 208:4 6.5 0.6 0.04
L10 L10 9 25 9 43 6 10 11 19 51 1 4965 212.1 10.4 1.0 0.04
L11 LII 9 26 9 43 6 10 11 19 52 1 21628 210.4 46.4 4.6 0.04
L12 L12 9 27 9 43 6 10 11 19 52 1 4964 212.6 10.4 1.0 0.04
LIS L13 9 28 9 44 6 10 11 19 53 1 12573 209.9 26.9 2.7 0.04
L14 LU 9 29 9 44 6 10 11 19 53 1 16221 209.4 34.7 3.5 0.04
L15 L15 9 SO 9 44 6 10 11 19 55 1 11133 208.7 23.8 2.4 0.04
L16 L16 9 SO 9 45 6 10 11 19 55 1 3625 207.0 7.5 0.8 0.04
LIT Lt7 9 31 9 45 6 10 11 19 57 1238 207.4 1.0 0.1 0.04
L18 L18 9 32 9 45 6 10 11 19 57 1 13607 211.6 29.1 2.9 0.04
L19 L19 9 32 9 46 6 10 11 19 59 1 2660 208.2 5.4 0.5 0.04
L20 L20 9 33 9 46 6 10 11 19 59 1 1529 216.7 3.0 0.3 0.04
L21 L2t 9 33 9 46 6 10 11 20 0 1 1026 212.5 1.9 0.2 0.04
L22 in 9 34 9 47 6 10 11 20 2 3 1252 205.3 0.6 0.1 0.04
L23 123 9 34 9 47 6 10 11 20 6 3 1080 209.6 0.5 0.1 0.04
L24 L24 9 35 9 47 6 10 11 20 6 3 1489 210.4 0.8 0.1 0.04
L25 US 9 35 9 48 6 10 11 20 10 3 1278 209.3 0.6 0.1 0.04
L26 9 52 9 48 6 10 11 20 10 3 1003 9in 0.4 0.1 0.04 L26 9 52 9 48 6 10 11 20 10 3 1003 0.1 0.04
L27 L27 9 53 9 48 6 10 11 20 13 2 1251 207.4 1.1 0.1 0.04
L28 L28 9 54 9 49 6 10 11 20 14 3 1005 212.2 0.4 0.1 0.04
L29 L29 55 49 6 10 11 20 17 3 1008 213.6 0.4 0.1 0.04 L29 L29 9 55 9 49 6 10 11 20 17 3 1008 213.6 0.4 0.1 0.04
L30 L30 9 56 9 49 6 10 11 20 17 1 2630 211.9 5.4 0.5 0,04
Page 1 of 4
C-9
CUENT DENISON MINES PROJECT; RADON FLUX MEASUREMENTS, WHITE MESA MILL PROJECT NO.; 11004.00
PILE 3 BATCH; L SURFACE: SOIL
AREA; COVER DEPLOYED; 6 7 11 RETRIEVED; 6
FIELD TECHNICIANS; WM,MC,TE,DLC COUNTED BY; DLC
COUNTING SYSTEM I.D.; M01/D21, M02/D20 CAL DUE; 6/10/12
AIR TEMP MIN;42''F
8 11 CHARCOAL BKG;
DATA ENTRY BY: DLC
WEATHER: NO RAIN
143 cpm WtOut: 180.0
TARE WEIGHT; 29.2
GRID SAMPLE DEPLOY RETRIV ANALYSIS MID-TIME CNT GROSS GROSS RADON + LLD
LOCATION LD, HR MIN HR MIN MO DA YR HR| MIN (MIN) :OUNTS WT IN s pCi/m^s pCi/m*s pCI/m
LSI LSI 10 15 10 1 6 10 11 20 20 1 1463 203.2 2.9 0.3 0.04
L32 L32 10 16 10 2 6 10 11 20 20 1 3722 208.8 7.9 0.8 0.04
L33 10 17 10 3 6 10 11 20 21 1 1453 209.1 2.9 0.3 0.04
LS4 10 18 10 4 6 10 11 20 21 1 4775 212.7 10.2 1.0 0.04
L35 L35 10 18 10 5 6 10 11 20 23 1 1824 210.3 3.7 0.4 0.04
LSO L36 10 19 10 6 6 10 11 20 23 1 4972 214.1 10.6 1.1 0.04
L37 L37 10 20 10 7 6 10 11 20 24 1 2152 211.5 4.4 0.4 0.04
LSS LSS 10 21 10 8 6 10 11 20 24 1 12176 213.5 26.4 2.6 0.04
LSO L39 10 22 10 9 6 10 11 20 25 1 13021 211.1 28.4 2.8 0.04
L40 L40 10 23 10 10 6 10 11 20 25 1 4174 211.4 8.9 0.9 0.04
L41 L41 10 24 10 11 6 10 11 20 27 1 6905 211.9 14.9 1.5 0.04
L42 142 10 26 10 1 6 10 11 20 27 1 1360 211.2 2.7 0.3 0.04
L4S L4S 10 27 10 2 6 10 11 20 28 1 2099 209.2 4.3 0.4 0.04
L44 L44 10 28 10 3 6 10 11 20 28 1 1018 211.1 1.9 0.2 0.04
L45 L45 10 29 10 4 6 10 11 20 SO 2 1167 209.4 1.0 0.1 0.04
L46 L46 10 SO 10 5 6 10 11 20 SO 1 1052 211.9 2.0 0.2 0.04
L47 L47 10 31 10 6 6 10 11 20 32 1 2276 210.8 4.7 0.5 0.04
L48 L48 10 32 10 7 6 10 11 20 32 1 2166 211.9 4.5 0.4 0.04
L49 L49 10 33 10 8 6 10 11 20 33 1 3247 211.6 6.9 0.7 0.04
im L50 10 34 10 9 6 10 11 20 33 1 6627 212.6 14.4 1.4 0.04
L51 L51 10 35 10 10 6 10 11 20 34 1 40549 213.7 89.8 9.0 0.04
L52 L52 10 36 10 11 6 10 11 20 34 1 2568 211.6 5.4 0.5 0.04
L5^ LSS 10 36 10 12 6 10 11 20 36 2 1233 211.2 1.1 0.1 0.04
L54 L54 ,. 10 37 10 13 6 10 11 20 36 1 8779 208.5 19.1 1.9 0.04
L55 L55 10 38 10 14 6 10 11 20 38 1 10784 208.3 23.6 2.4 0.04
L56 L56 10 40 10 15 6 10 11 20 38 1 34003 203.2 75.0 7.5 0.04
LSf L57 10 40 10 16 6 10 11 20 39 1 16999 208.9 37.4 3.7 0.04
LSS 10 41 10 17 6 10 11 20 39 1 1425 209.3 2.8 0.3 0.04
L59 L59 10 42 10 18 6 10 11 20 41 1 2354 212.6 4.9 0.5 0.04
L60 L60 10 42 10 19 6 10 11 20 43 2 1359 210.1 1.2 0.1 0.04
Page 2 of 4
C-10
CUENT DENISON MINES PROJECT: RADON FLUX MEASUREMENTS, WHITE MESA MILL PROJECT NO.; 11004.00
PILES BATCH; L SURFACE SOIL AIR TEMP MIN; 42°F
AREA; COVER DEPLOYED; 6 7 11 RETRIEVED; 6 8 11 CHARCOAL BKG:
FIELD TECHNICIANS: WM,MC,TE,DLC COUNTED BY; DLC DATA ENTRY BY DLC
COUNTING SYSTEM I.D.; M01/D21. M02/D20 CAL DUE; 6/10/12
WEATHER; NO RAIN
143 cpm WtOut: 180.0 g.
TARE WEIGHT; 29.2 g.
GRID SAMPLE DEPLOY RETRIV ANALYSIS MID-TIME CNT GROSS GROSS RADON ± LLD
LOCATION LD. HR MIN HR MIN MO DA YR HR MIN (MIN) COUNTS WTIN pCj/m*s pCI/m^s pCi/m-'s COMMENTS;
L61 L61 10 43 10 20 6 10 11 20 45 1 1198 212.7 23 0.2 0.04
L62 L62 10 43 10 21 6 10 11 20 45 1 1243 210.1 2.4 0.2 0.04
L63 L63 10 44 10 22 6 10 11 20 46 1 7326 208.4 15.9 1.6 0.04
L64 L64 10 45 10 23 6 10 11 20 46 1 3208 209.5 6.8 0.7 0.04
LSS L6S 10 46 10 24 6 10 11 20 47 1 2166 209.6 4.5 0.4 0.04
L66 L66 10 46 10 25 6 10 11 20 47 1 1330 207.9 2.6 0.3 0.04
L67 L67 10 47 10 24 6 10 11 20 48 1 3643 208.8 7.8 0.8 0.04
L68 L68 10 48 10 25 6 10 11 20 49 2 1390 210.2 1.2 0.1 0.04
L69 L69 10 49 10 26 6 10 11 20 SO 1 4396 213.0 9.4 0.9 0.04
L70 ' L70 10 SO 10 27 6 10 11 20 52 1 3387 208.8 7.2 0.7 0.04
L71 L71 10 51 10 28 6 10 11 20 53 1 12220 209.6 26.8 27 0.04
L72 L72 10 51 10 29 6 10 11 20 53 1 2758 210.7 5.8 0.6 0.04
L73 L73 10 52 10 30 6 10 11 20 54 1 1756 213.4 3.6 0.4 0.04 •T| L74 L74 10 53 10 31 6 10 11 20 55 2 1207 2107 1.0 0.1 0.04
L76 L75 10 54 10 32 6 10 11 20 56 1 2936 204.8 6.2 0.6 0.04
L76 L76 10 55 10 33 6 10 11 20 57 1 2858 210.7 6.0 0.6 0.04
LTT L77 10 55 10 34 6 10 11 20 59 2 1380 210.3 1.2 0.1 0.04 ••r'
LT8 L78 10 56 10 35 6 10 11 20 59 1 4042 214.3 S.6 0.9 O.04
LT9 L79 10 57 10 36 6 10 11 21 1 2 1625 213.3 1.5 0.1 0.04
LSO LSO 10 58 10 37 6 10 11 21 1 2 1850 2123 17 0.2 0.04
L81 L81 11 7 10 39 6 10 11 21 4 1 2858 208.8 6.0 0.6 0.04
L82 L82 11 9 10 40 6 10 11 21 5 ..2., 1122 220.3 0.9 0.1 0.04
L83 L83 11 11 11 1 6 10 11 21 7 1 1211 2107 23 0.2 0.04
L84 L84 11 13 11 2 6 10 11 21 7 1 1279 207.3 25 0.2 0.04
LSS L85 11 14 11 3 6 10 11 21 8 1 6893 211.3 14.8 1.5 0.04
L86 L86 11 14 11 4 6 10 11 21 8 1 5486 210.8 117 1.2 0.04
L87 L87 11 15 11 5 6 10 11 21 9 1 1586 210.4 3.2 0.3 0.04
LSS LSS 11 16 11 6 6 10 11 21 9 1 5158 214.6 11.0 1.1 0.04
L89 LSS 11 17 11 7 6 10 11 21 11 1 1071 209.6 20 0.2 0.04
L90 LSO 11 18 11 8 6 10 11 21 12 2 1112 210.4 0.9 0.1 0.04
Page 3 of 4
C-11
CUENT: DENISON MINES PROJECT; RADON FLUX MEASUREMENTS, WHITE MESA MILL PROJECT NO.; 11004.00
PILE 3 BATCH; L SURFACE; SOIL
AREA; COVER DEPLOYED; 6 7 11 RETRIEVED; 6
FIELD TECHNICIANS: WM,MC,TE,DLC COUNTED BY; DLC
COUNTING SYSTEM I.D.; M01/D21, M02/D20 CAL DUE: 6/10/12
AIR TEMP MIN;42T
8 11 CHARCOAL BKG;
DATA ENTRY BY: DLC
WEATHER: NO RAIN
143 cpm WtOut; 180.0
TARE WEIGHT 29.2
GRID
LOCATION
SAMPLE
L D.
DEPLOY RETRIV ANALYSIS
HR MIN HR MIN MODA YR
MID-TIME
HR Mill
CNT GROSS
(MIN);OUNTS
GROSS
WT IN,.,a
RADON
pCi/m^s
+
pCilmm
LLD ^'j
pCi/m-'s COMMENTS:
L91
L92
L91
L92 ]] 19
20
11
11
9
1
6
6
10
10
11
11
21
21
13
14
1
2
3914
1163
211.3
210.5
8.3
1.0
0.8
0.1
0.04
0.04
L9$ L93 11 18 11 2 6 10 11 21 15 2 1494 210.0 1.3 0.1 0.04
im LS4 11 16 11 3 6 10 11 21 16 1 1652 207.3 3.3 0.3 0.04
L95
L96
L97
LSS
L96
L97 ii 14
12
10
11
11
11
4
5
6
6
6
6
10
10
10
11
11
11
21
21
21
17
17
18
1
1
1
17397
1067
2810
214.4
213.1
209.9
37.9
2.0
5.8
3.8
0.2
0.6
0.04
0.04
0.04
L?8
L99
L100
L98
L99
L100 ii 8
6
4
11
11
11
7
8
9
6
6
6
10
10
10
11
11
11
21
21
21
20
21
22
3
1
1
1295
2222
5379
211.9
211.8
211.7
0.6
4.5
11.4
0.1
0.5
1.1
0.04
0.04
0.04
AVERAGE RADON FLUX RATE FOR THE CELL 3 COVERED REGION: 9.5 pCi/m^s
BLANK CANISTER ANALYSIS;
GRID SAMPLE .•§ RETRIV ANALYSIS MID-TIME CNT GROSS GROSS RADON ± :H LLD 1 i
LOCATION L D, HR MIN HR MIN MO DA YR HR MIN (MIN) :OUNTS ....VVTINii pCi/m%i pCI/m's pCiim's COMMENTS:
L BLANK 1 L BLANK 1 9 20 9 31 6 10 11 19 4 10 1662 207.6 0.05 0.03 0.04 CONTROL
L BLANK 2 L BLANK 2 9 20 9 31 6 10 11 19 4 10 1845 206.3 0.09 0.03 0.04 CONTROL
L BLANK S
L BLANK 4
L BLANK S
L BLANK 4
9
9
20
20
9
9
31
31
6
6
10
10
11
11
19
19
17
17
10
10
1831
2125
205.9
207.0
0.09
0.15
O.OS
0.03
0.04
0.04
CONTROL
CONTROL
LBLANK 5 L BLANK 5 9 20 9 31 6 10 11 19 SO 10 2096 207.7 0.14 0.03 0.04 CONTROL
AVERAGE BLANK CANISTER ANALYSIS FOR THE CELL 3 COVERED REGION: 0.10 pCI/m^s
Page 4 of 4
C-12