DRC-2008-002161 - 0901a068803ff74d

/\inr C'^.¿ $ l\to5
Deni¡on Miner (USA) Corp.
1050 17th Stroc[ Sulb 950
Denvtr, CO 80265
U8A
MINES MAR 2 8 2008
(USA) Conp.
c.
Vice President, Regulatory Affairs and Counsel
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Tel : 303 62E.7798
F¡x : 303 389"112ã
¡Ywwdanþonm¡no3.com
March 27,2008
Mr. Bryce Bird
Division of Air Quality
Utah Departnent of Environmental Quality
1140 North 1950 West
P.O. Box 144820
Salt Lake City, UT 84114-4820
Dear Mr. Bird:
Re: 'White Mesa Uranium Mill-National Emission Standards for Radon Emissions from
Operating Mill Tailings 40 CRF Part 61, Subpart W-Arurual Report
Dear Mr. Finerfrock,
"I certify under penalty of law that I have personally examined and am familiar with the
information submitted herein and based on my inquþ 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
Manager of Environmental Affairs.
please
," "riV
Y
Please find enclosed the annual report pertaining to radon emissions from the tailings impoundment at
the White Mesa Mill. The results of 2007 testing indicate that the facility was in compliance with the
20 pCi/m2-sec radon emanation standard at 13.5 and 8.9 pCi/m2-sec for Cells 2 and3,respectively. In
accordance with the requirement of the NESHAP standard my signature below affirms the following
certification:
Docu ment Date: 0it27 l20}g
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TABLE OF CONTENTS
1. INTRODUCTION......
2. SITE HISTORY AND DESCRIPTION..........
3. REGULATORY REQUIREMENTS FOR THE SITE...
4. SAMPLING METHODOLOGY..
5. FIELD OPERATIONS
5. 1 Equipment Preparation....
5.2 Sample Locations, Identification, and Placement...
5.3 Sample Retrieval......
5.4 Environmental Conditions ...
6. SAMPLE ANALYSIS .....
ó.1 Apparatus......
6.2 Sample Inspection and Documentation
6.3 Background and Sample Counting
7. QUALTTY CONTROL (QC) AND DATA VALIDATION................
7. I Sensitivity .........
7 .2 Precision...............
7 .3 Accuracy......
7.4 Completeness
8, CALCULATIONS
9. RESULTS.....
9.1 Mean Radon Flux
9.2 Site Results
Appendix A. Charcoal Canister Analyses Support Documents
Appendix B. Recount DataAnalYses
Appendix C. Radon Flux Sample LaboratoryData,Including Blanks
Appendix D. Sample Locations Map (Figure 2)
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According to subsection 61 .252 Standard, (a) rudon-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 8."
4, SAMPLING METHODOLOGY
Radon emissions were measured using Large Area Activated Charcoal Canisters (canisters) in
conformance with 40 CFR, Part 6I, Appendix B, Method 115, Restrictions to Radon Flux
Measurements, (EPA, 2007). 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 lO-inch
diameter PVC end cap containing a bed of 180 grams of activated, gtanular charcoal. The prepared
charcoal was placed in the canisters on a support gnd on top of a /, inch thick layer of foam and
secured with a retaining ring under Ilzinches of foam (see Figure 1, page 10).
The sampling effort commonced on June It,2007. One hundred canisters were placed in each region.
Due to worker health and safety concerns, measurement of the wet beach areas 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 radioactivelead-214 and bismuth-2l4.
These radon progeny isotopes emit characteristic garnma 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 24 hours, the exposed charcoal was transferred to a sealed plastic sample container (to prevent
radon loss and 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 Denison Mines Radiation Safety personnel and
released for unrestricted use. Tellco personnel maintained custody of the samples from collection
through analysis.
5. F'IELD OPERATIONS
5.1 Equipment Preparation
A1l 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 È 0.1 percent. (Appendix A).
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In accordance with 40 CFR, Part6l, Appendix B, Method 115:
o Measurements were not initiated within 24 hours of significant (>0'1 inches) rainfall.
However, after the radon canisters were placed on the Cell2 Beach Region on June 11,
2007, approximately 0.15 inches of rain fell at the site within the subsequen|2| hour period
as measured by both Tellco's and Denison Mines' on-site rain gauges. Due to this rainfall
event, further canister deployment was delayed until June 13, 2007 '
o The seals around the lips of the canisters on Cell 2Beach Region were not compromised
nor were the canisters surrounded by water.
o None of the radon measurements presented in this report were performed during
temperatures below 35oF or on frozen ground (the minimum air temperature recorded at
the site during the collection periods was 54oF).
6. SAMPLE ANALYSIS
6.1 Apparatus
Apparatus used for the analYsis:
o Single- or multi-channel pulse height analysis system, Ludlum Model 2200 with a
Teledyne 3" x 3" sodium iodide, thallium-activated (Na(Tl)) detector.
. Lead shielded counting well approximately 40 cm deep with 5-cm thick lead walls and a7-
cm thick base and 5 cm thick toP'
o National Institute of Standards and Technology (MST) traceable aqueous solution radium-
226 absorbed onto 180 grams of activated charcoal.
. Ohaus Model C501 balance with O.l-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. Latoratory staff documented damaged or unsealed containers and verified that the
data sheet was complete.
Two samples were lost in the field due to charcoal spillage and anothçr sample was lost when the
canister was run over and destroyed by a dump truck after being placed. All of the remaining 397
sample containers received and inspected at the Tellco analytical laboratory were verified as valid.
6.3 Background and Sample Counting
The gamma ray counting system was checked daily, including background. and radíum-226 source
measlurementr 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).
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7.3 Accuracy
Accuracy of field measurements \ryas assessed daily by counting two laboratory control samples with
known Ra-226 content. Accuracy of these lab control sample measutements, expressed as percent
bias, ranged from approximately -1.3 percent to +1.8 percent. The arithmetic average bias of the lab
control sample measurements was approximately +0.04 percent (see Appendix A).
7.4 Completeness
All 100 samples from the Cell 2 Beaches Region were verified, representing 100 percent
completeness for that region. Ninety-nine of the samples from the Cell 2 Covered Region were
verified, representing 99 percent completeness for that region.
Ninety-nine of the samples from the Cell 3 Beaches region were verified, representing 99 percent
completeness for that region. Ninety-nine of the samples from the Cell 3 Covered Region were
verified, representing 99 percent completeness for that region.
Altogether, 397 samples from the total 400 sample locations were verified during this sampling
pro grarn, representin g 99 .3 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 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
pCikt222/n2sec:¡.¡rxei,*UrO.5(d/er.75)l
where: N
Ts
b
d
A
:net sample countrate, cpmunder 220-662 keVpeak: sample druation, seconds: insftument calibration factor, cpmper pCi; values used:
0.1738, for M-01/D-21 and
0.l755,forM-021D-20: decay time, elapsed horus between sample mid-time and count mid-time: area ofthe canister, m
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9.2 Site Results
Site Specific Sample Results (reference Figure 2 andAppendix C)
(a) The mean radon flux for each region within the site as follows
Cell2 - Cover Area
- Beach Area
Cell3-CoverArea
- Beach Areas
- Standing Liquid
13.I pCi/r*-s (based on267,858 nf area)
50.2 pCrlmz-s (based on 2,7 66 r* area)
: L3.9 pCi/m2-s (based on 157,581 m2 area)
: 6J pCr/m2-s (based on 56,266 m2 area)
: 0 pCi/m2-s (based on 75,01 | mz arca)
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:
CelI2: 13.5 pCi/m2-s
(13.D(267 .8s8]' + (s0.^Q.7 66)-
270,624
Cell3: 8.9 pCt/m2-s
(13.9X157.581) + (6.î(56.260 + (0X75.01 1)
288,858
As shown above, the arithmetic mean radon flux for the each cell at Denison Mines' White Mesa
milling facitity is below the NRC and EPA standard o120 pCrlm2-s. No condition or unusual event
occuned 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 v/as produced by Tellco.
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Figure 1
Large Area Activated Charcoal Canisters Diagram
Handl¿I /A-in. Vènr Hole
FIûURE I Large-Are¡ Radon {ioìlector
'l .in fhick
Søubbet Pad
I /?-in, lhick
Scrubber Pad
1 ./ 2. n. Tlrick Charcr¡¿l
5r:Épott Grid
Rs¡ainer
Spring
I O-in. dia
PVC Ënd Cap
¡í¡
m
¡1
;
ÌË
Ë
V-
10
AGCU RACY APPRAISAL TABLE
DENTSON MINES (USA) CORPORATION
WHITE MESA MILL, BLANDING, UTAH
2OO7 NESHAPS RADON FLUX MEASUREMENTS
CELLS 2 & 3
0.6%
O.3o/o
1-Oo/o
0.70/o
0-1Yo
1.8o/o
1-60/o
-O-1o'/o
-O.1o/o
0.9%
-O-7"/o
0.2%
-0.6%
0.1"/o
-1-3o/"
-1-3o/o
-O-7o/o
-O.5o/o
O.1o/o
% BIAS
-0.5o/o
-0.9olo
-0.30/o
-0.3o/o
O.7o/o
59300
59300
59300
59300
59300
59300
59300
59300
59300
59300
59300
59300
59300
59300
59300
59300
59300
59300
59300
59300
59300
KNOWN
oci
59300
59300
59300
GS-05
GS-05
GS.O5
GS-05
GS-05
GS-05
GS-05
GS-05
GS-05
GS-04
GS-04
GS-04
GS-04
GS-04
GS-04
SOURCE
ID
GS-04
GS-04
GS-04
GS-04
GS-04
GS-04
GS-05
GS-05
GS-05
59918
59656
59497
59337
59738
59345
60387
60239
59238
59231
5984E
58910
59095
59097
59741
59436
58959
59373
58502
58523
58909
59028
FOUND
Dci
59008
58782
0.1755
0.1755
0.1755
0.,1755
0.1755
0.1755
0.1755
0.1755
0.1738
0.1738
0.1738
0.1738
0.1738
0.1738
0.1755
0.1755
0.1755
0.1755
YIELD
cDm/oCi
0.1738
0.1738
0.1738
0.1738
0.1738
0.1738
10339
10470
10442
10171
10238
10259
10414
10516
10484
10415
10598
10572
10396
10395
10503
AVG NET
cpm
10256
10216
10271
10271
10383
10330
10247
10319
10168
10541
10493
10613
10s92
10426
10695
10804
10520
10517
10767
10492
10525
10212
10349
10238
10632
105't4
10332
10493
10233
10412
10155
10419
10601
10562
10448
10598
10482
10640
10544
10346
10430
10313
10466
10434
10549
10754
10682
10505
10871
10631
10362
10530
10361
10569
10477
10542
10574
10611
10672
103/.2
10483
10579
10562
10674
10611
10665
10499
10619
10529
10402
each)
#1 #2 #3
1 0269
10286
10505
10388
10458
10352
10224
10497
10243
10171
10512
124
126
128
108
127
133
138
137
125
124
122
137
138
124
126
128
108
127
133
137
125
124
122
137
127
137
150
135
115
142
120
137
150
135
115
142
120
118
110
157
127
133
133
118
110
157
133
133
123
121
137
114
131
147
134
144
't22
133
148
147
131
123
121
137
114
131
131
Bkg Counts (1 min. each)#1 lnl #3
134
1M
122
133
148
6t't7t2007
611812007
6t18t2007
611912007
6t19t2007
611712007
611712007
6t18t2007
611812007
6l'1912007
6t19t2007
DATE
6t17t2007
6t17t2007
611812007
611812007
6t19t2007
611912007
611712007
611712007
6t18t2007
611812007
6t19t2007
611912007
6t17t2007
M-021D-20
M-OztD-20
M-OzlD-20
M-OAD-20
M-OAD-20
M-OAD-20
M-OzlD-20
M-O2lD-20
M-OztD-20
M-OAD-20
AVERAGE PERCENT BIAS FOR ALL ANALYTICAL SESSIONS:o.o4%
SYSTEM
LD.
M-O1tD-21
M-O1tD-21
M-01tD-21
M-O1tD-21
M-O1tD-21
M-O1tD-21
M-O1tD-21
M-O1tD-21
M-01/D-21
M-O1tD-21
M-O1tD-21
M-O1lD-21
M-OAD-20
M-02tD-20
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\^lSìTE
CtrIARCO.AL CANISTER ANALYSIS SYSTEM
e l.^ì \\\luel\¿1 t¡.'7
l,( 5 t
Calibration Check Loe
b/ot /Ð'î Due Tìqfe'
CLIENT:
z2-oo
ltA- o r
/ 44-zo
4
Scaler SÆ,Tl 5Ê12
Detçctor SN:4rs33
Blank Çanister Bkgd. Range, cpm: 2 o =
Gross Soûce Range, cPnr: 2 a:
t tDc2 W'indo-rv: 4.42 Thrshld: 2.20
21.GS -05 Source Activíty:VK c\
3o: Ô7 tol}o to t-7
lool +to I a.lb] 3o: 1otÖo to
Technician:(
)nunSoureemm.ok?
Yn{#3 Average#2Avs.#t#3
By
#l
Date
lo-6t a^^os-I f)oz?,¿.tr6 \31It1
I oA*<ì¡t /^t)\ o&^2t'.!t )ÀonIOt2-<o 1n>ZV to10zlt4t3lLz-rçl(t
lOL \v toznù/_w lot-? Il z"-. 13}-@t I o)7V| ôlFta ,toL#I iol to5L.Þ171I +?)13-rI
I o4?è I o4lqI
"0\r:6I &-1 r ?.qh
Y/I\JI Y : ¿verage backgtound and source cpm falls within the contol limits.
N : average bacþround and source cpm does not fall within the conEol limits.
The acceptable rariges were dÞtermined from prior backgtound and so¡roe checlc data'
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SITE
CLIENT: Ð
l-rtJl.'t "q 27Oo/ 44-zo
System ID: NA-oz P'zo
Scalçr SN:
DetecrorSrN, 4 1532-
Blank Carúster Bkgd, Range, cpm: 2 o =
Gross Sor¡rce Range, cpm: 2 o
All counts fimes are one
CHARCOAL CANISTER ANÀLYSIS SYSTEM
wl nì*<- ì\eça ìlt E[r,rrJi
ìr'r, ¿ S r.4 Lo
Calibration Chpe-k Log
Càlibration Date: U/ ù1 I a
(,
toû) to lol l+
to r to3 ø
1o-
7 Due
High.Voltage:
Source IDISN:
t17
BzS rwindow 4.42 Th¡shld: 2.24
Source Activity:9,3 K pci
= lol v3
to
to
3.o:
3o=
YA{: Y : averagq background and sourçç epm falls within the coutol limits.
N = average bacþround and sowçQ cpm does not fall witlin the conüol limits.
The acce,ptable .ranges were determined from prior background ând source check data.
Counts nun Source Counts (1 min. each)
#3 Avelage
ok?
Y/N#Ave,#l #2
By
#l 2
Date
l:o521 Vl1 +t'ál lOt4arc,t3l 1,/tt /47 w.&q'It.3i t 044ß o-çt-1 raSvþr,fO t>iD+¿>7t -7 t0 Ceï I II 2,r 13q-tzB ILøÐt0'h^
¡ I /-å*l945otrof¡10 lalqz-a"'7 lsdJ to<q1t>ø toø t lOr^4o 2s4 Ilr4I A-?^Ì1,'ølp, Ir¡t l ,l2^ç1 lo.[^az-to.94L tû+q3 laq10It'Lo r7"6/ ø /o7 (
')
Appendix B
Recount Data Analyses
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B
.v 'J J .v 'J 'J 'J J
CLIENT: DENISON MINES PROJECT: RADON FLUX MEASUREMENTS, WHITE MESA MILL
AIR TEMP MIN: 56"F
14 7 CHARCOALBKG:
DATA ENTRY BY: DLC
PROJECT N0.: 07004.00
WEATHER: NO RAINcpm Wt. Out
TARE WEIGHT:
PILE:3 BATCH: B SURFACE:TAILINGS
AREA: BEACH DEPLOYED: 6 13 7 RETRIEVED: 6
FIELD TECHNICIANS: MG,GS,DLG COUNTED BY: DLC
COUNTING SYSTEM l.D.: M01/D21, M0ZD20 CAL. DUE:6/07/08
RECOUNT CANISTER ANALYSIS:
148
222.9
222 -9
180.0 s.
g.29.2
820
RECOUNT
820
820
I
8
35
35
46
46
6 18 7619't t2
15
57
57
36.4
37 .0
0.05
0.06
1
l_
II
L2683
10528
3.6
3.7
L
7 .62
GRlD
T..oCÀTrON
S.èMPTE
I. D.
RETRIV A¡IÀLYSTS llflD_lIME
ER MIN SR !,fiN }IO DA YR ÍR MTI{
GROSS
COUÑTS
GROSS
!{T IN
cNr
(MIN)
t
pCi,/m's
PRECTSfON
T RPD/m's
LT,DRÀÐON
"g
840
RECOUNT
840
B40
59
59
I
I
59
59
6 18 7619 7
4
4
I
I
l_3
15
31
31
l_t_ 4 0
1055
222 -5
222.5
0.40
0-41
0-05
0.06
0-1
0.1 2 -52
B60
RECOUNT
618 7679 7
74
15
B60
B60
9
9
9
9
9
9
4
4
9
9
1
1
2369
]-992
226 -8
226.8
0.05
0 _ 06 1,.53
0.7
o_7
6.5
6.6
880
RECOUNT
880
880
2
2
9
9
9
9
29
29
38
38
6 18 16t9 7
t4
15
30
30
1- 37
1.35
0.05
0.06
L232
l_0 63
278 -2
2L8 -2
0.1
0.1 1. 5?
810 0
RECOUNT
8100
8100
1t46
1,096
2L9.3
2L9.3
0.24
0.25
7
7
9
9
9
9
49
49
52
52
6 18 7619 7
15
15
5
5
0.05
0.06
0.050.06 4.tz
À\IERAG¡E PERCENT PRECTSION FOR TEE CE1L 3 BTACEES REGION: 3-7e"
Page 1 of 1
CLIENT: DENISON MINES PROJECT: RADON FLUX MEASUREMENTS, WHITE MESA MILI PROJECT NO.: 07004.00
PILE:2 BATCH: D SURFACE: SOIL
AREA: COVER DEPLOYED: 6 15 7 RETRIEVED: 6
FIELD TECHNICIANS: MG,CS,DLC COUNTED BY: DLC
COUNTING SYSTEM l.D.: M0'l/D21, M0ZD20 CAL. DUE: 6/07/08
AIR TEMP MIN: 58"F
16 7 CHARCOALBKG:
DATA ENTRY BY: DLC
WEATHER: NO RAIN160 cpm
.9
.'7
1.6
0.7
180.0
29.2
0-03
0.03
0 - 03
0-03
Wt,Out:
TARE WEIGHT:
g.
9.
2..5.. 0-03 ..r.2 0-03
0.4 0.030.1 0.031'.3 0.03:.1".'7 0.032.6 0.03
D69
D70
I.,]^69 t2
D,7-0 1-2
D7t L2
D'72 12
D?3 Ii
12
T2
L2
12
1,2
t2
T7
7'7
71
L'7
L'l
5t
38
39
40
41
42
43
44
45
46
41
48
49
50
l-5877
4!42664]-
2400
1,01,2
'7',l7t
2L0 -7
198.6
27]-.2
21,L -3
214.5
2L2.3
I 0.03
D74 12
6
6
b
6
t
5
9
6
'7
1i
.I
9.5
10.6
Le-:6
3..2
1"0
4't.0
r"7
0.4
0.2
0-2
z-Õ
24.r
1
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2
ÀVERJAGE RÀDON FLUX R,ATE FOR TEE CEI-T. 2 CO\¡ERED REGION:
Page 3 of 3
13.1 pCi/m2s
CLIENT: DENISON MINES PROJECT: RADON FLUX MEASUREMENTS, WHITE MESA MILL PROJECT NO.: 07004.00
WEATHER: RAINED 0.15 INCHES AFTER PLACEMENTcpm Wt. Out 180.0 S.
TARE WEIGHT: 29.2 s.
PILE: 2 BATCH:A SURFACE:TAILINGS
AREA: BEACH DEPLOYED: 6 11 7 RETRIEVED:
FIELD TECHNICIANS: MG,CS,DLC COUNTED BY: DLC
COUNTING SYSTEM l.D.: M01/D21, M0AD20 CAL. DUE: 6/07/08
15 618'l15618"1
AIR TEMP MIN: 54'F6 12 7 CHARCOALBKG:
DATA ENTRY BY: DLC
156
1
7
7
'7
7
.I
"t
7
7
7
'7
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2
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3
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1 s8193 21-4.2
1 39832 222 -6
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2 1376 220 -71" 2550 223.8 0.0
1 4 7 L7 6 18 't 11 21 1 2927 218.9 l-1.7 t.2 0-08'7 4 7 1"8 6 1"8 "l Lt 2t l- 1?36 2L6.8 6.6 o-7 0-08
7 5 7 tB 6 1-8 7 1,1 22 1- 3745 222.0 15.1 1.s 0-08't 5 ? 18 6 18 7 L7 22 1, 9]-'79 2L8-7 3'7-6 3-8 0-08't 6 7 rg 6 18 '7 tr 23 1 "6659 2t6.2 27-4 2-7 0-08
7 6 'l 19 61"8 1 LL 23 1- 5526 220.8 .22.4 2.2 0-0860.9 6.1 0. 0B
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36.6 3.7 0.086.8 0.- 7 0. 08
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'7 7 1,9'7 120
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Page 1 of 3
PILE: 2 BATCH:A SURFACE: TAILINGS
AREA: BEACH DEPLOYED: 6 11 7 RETRIEVED: 6
FIELD TECHNICIANS: MG,CS,DLC COUNTED BY: DLC
COUNTING SYSTEM l.D.: M01/D21, M0ZD20 CAL. DUE:6/07/08
CLIENT: DENISON MINES PROJECT: RADON FLUX MEASUREMENTS, WHITE MESA MILL PROJECT NO.: 07004.00
WEATHER: RAINED 0.15 INCHES AFTER PI-ACEMENTcpm Wt. Out 180.0 g.
TARE WEIGHT: 29.2 g.
2!9.4 151. L7 3't 6 18 't \2
7 3'r 618 7 12
7 3'7 6 l-8 '7 L27 3'7 6 r.8 ',t 12
AIR TEMP MIN: 54"F
12 7 CHARCOALBKG:
DATA ENTRY BY: DLC
16
L6
L7
L8
156
3ss04
3 60105228 222.0 27.6
78296 21-3 .7 16 .5
1241 223.0L020 2:-',t .27720 219.5751L2 220.3 6
2.2 0.08
'1 -6 0-080-s 0.08 i0.1 0.08 :0.1 0.086.6 0.08
1.8
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6.9 0.08
A69
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A1 L
A12
A73
A74
A75
A'7 6
A77
A78
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r-.5
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38 618"1 L2 22 1 277.3 46.838
38
39
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1-6415
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144.4 14 .4 0 .08 l
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080
A\IER.AGE RA,DON FLUX R;è,TE FOR TEE CEI-L 2 BEJLCEES REGION:
Page 3 of 3
50 -2 2s
CLIENT: DENISON MINES PROJECT: RADON FLUX MEASUREMENTS, WHITE MESA MILL
AIR TEMP MIN: 56"F
14 7 CHARCOALBKG:
DATA ENTRY BY: DLC
PROJECT NO.: 07004.00
WEATHER: NO RAINcpm Wt. Out:
TARE WEIGHT:
PILE:3 BATCH:B SURFACE:TAILINGS
AREA: BEACH DEPLOYED: 6 13 7 RETRIEVED: 6
FIELD TECHNICIANS: MG,CS,DLC COUNTED BY: DLC
COUNTING SYSTEM l.D.: M01/D21, I'/l021D20 CAL. DUE: 6/07/08
148 180.0
29.2
s.
g,
835
836
l 845
B4'7
84B
850
B4L
842
835
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76
Paqe 2 of 3
CLIENT: DENISON MINES PROJECT: RADON FLUX MEASUREMENTS, WHITE MESA MILL PROJECT NO.: 07004.00
PILE: 3 BATCH: C SURFACE: SO|L
AREA: COVER DEPLOYED: 6 14 7 RETRIEVED: 6
FIELD TECHNICIANS: MG,CS,DLC COUNTED BY: DLC
COUNTING SYSTEM l.D.: M01/D21, M02lD20 CAL. DUE: 6/07/08
AIR TEMP MIN: 57"F
15 7 CHARCOALBKG:
DATA ENTRY BY: DLC
WEATHER: NO RAIN151 cpm Wt. Out:
TARE WEIGHT:
180.0
29.2
g.
g.
10
10
10 10 6 t7 7 t8 10 1 38915 8.2 0.0
10 11 6 r7 ? 18 l-0 L 69971- 215.3 l-45.8 L4.6 0,04 :
10 L2 6 71 7 18 1r- 1 11066 2L4.4 23-0 2.3 0.04
10 13 6 L7 7 1,8 l-1 1 1025 21,1,.5 1-. I 0 .2 0.04
c07
c08
16 677 7 r8 L3 1
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l-5 6 7"1 ? 1"8 L2 t 5265 2L3 .7 10 .7 1.1 0 . 04
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c11 c11 10 1.4 10 20 6 L7 7 t8 18 3 1410
cLz c1,2 10 15 10 2! 6 L7 "l L8 1-7 7 tt24
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c14 C!4 r-O t7 10 23 6 tJ '7 L8 20 1 6038
c15 c15 10 18 10 24 6 L7 7 18 2L 7 4496
c16 C16 10 19 10 25 6 11 '7 l8 2L 1 t4L1 6
217 .3
2 -L6.L212.8
216 -9
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2t6 -t
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c2oc21- C2r 10 24 10 30 6 L't 7 l-8 24 L 2gB1 2l-5.3
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destroyed b'
0.1 0.04
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0.04
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6
6
6
1,"7 '7
t7 '7
L't 't
11 'l
L7 '7
r'7 7T't '7
L'7 'l
L77
CLIENT: DENISON MINES PROJECT: RADON FLUX MEASUREMENTS, WHITE MESA MILL PROJECT NO.: 07004.00
PILE: 3 BATCH: C SURFACE: SOIL
AREA: COVER DEPLOYED: 6 14 7 RETRIEVED: 6
FIELD TECHNICIANS: MG,CS,DLC COUNTED BY: DLC
COUNTING SYSTEM l.D.: M0'l/D21, M0UD20 CAL. DUE:6/07/08
AIR TEMP MIN: 57"F
15 7 CHARCOALBKG:
DATA ENTRY BY: DLC
WEATHER:NO RAIN151 cpm Wt. Out
TARE WEIGHT:
180.0
29.2
g.
s.
c70
c'7L
c'|2
c73
c74
1042
12t8
3 514
1416
!449
2387
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c?0
c'tL
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c75
u/o
c77 1Lc78 l-1
c7 9 t_1c80 11
c8l_ t_1
c82 11CB3 11
c8 4 1t-c85 11-
c86 11c87 11
c8 B l_1
c8 9 1r.'"
c90 11
19 54
19 54
19 55
2986
739't
1,256
1233
'1223
491 4
3469
Ll604
c'7 9
c80
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c82
c97
c98.
c99
c100
4
4
0
0
0
1
1
1
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4
4
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1002 217 -21939 21_4.9
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1 0 01 2t? _'t3036 2L6.11048 2L2.0
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48
49
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52
52
53
ÀVERJA,GE RJADON E'LU)C RJàTE FOR TEE CELT 3 CO\/ERED REGION
Page 3 of 3
13.9 pCi/m2s
CLIENT: DENISON MINES PROJECT; RADON FLUX MEASUREMENTS, WHITE MESA MILL PROJECT NO.: 07004,00
PILE:2 BATCH: D SURFACE: SOIL
AREA: COVER DEPLOYED: 6 15 7 RETRIEVED: 6
FIELD TECHNICIANS: MG,CS,DLC COUNTED BY: DLC
COUNTING SYSTEM LD.: M01/D21, M0UD20 CAL. DUE:6/07/08
AIR TEMP MIN: 58'F
16 7 CHARCOALBKG:
DATA ENTRY BY: DLC
WEATHER: NO RAIN160 cpm M. Out
TARE WEIGHT:
180.0
29.2
g.
g.
D35 72 22 72 25 6 L] 't 21 19
D3 6 L2 23 \2 26 6 1-'l 'l 21 19
D371224L2266L77212r
D38 1.2 25 12 27 6 t7 7 21 2L
D39 12 26 12 21 6l'r'7 21, 22D40 L2 2'7 72 28 6 11 7 21 22
1
1
2548 2r0 -2L032 21-1-.2rsar 2Ià.i13878 2r0.3
25981 198. B
6920 2L0.7
4g'13 20s - 026L44 208.6
367 9
566"t
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Page 2 of 3
l.-4 0.1
1.1, 0 . r-
L.4 0.1
16 .9 7 .'7
CLIENT: DENISON MINES PROJECT RADON FLUX MF3SUREMENTS, WHITE MESA MILL PROJECT NO.: 07004.00
WEATHER: RAINED 0.15 INCHESÆTER PLACEMENT
@m W[ Out 180.0 g.
TARE WEIGHT: 29.2 g.
PILE:2 BATCH:A SURFACE: TAILINGS
AREA BEACH DEPLOYED: 6 11 7 RETRIEVED: 6
FIELD TECHNICIANS: MG,CS,DLC COUNTED BY: DLC
COUNTING SYSTEM l.D.: M01/021, M0UD20 CAL. DUE:6/07/08
AIRTEMP MIN:54'F,12 7 CHARCOAL BKG:
DATA ENTRY BY: DLC
156
BI.ANK CANISTER AI.IALYSIS:
GRTD
LOCÀ?ION
RE.TRIV AIiIATYSIS MTD-TIME
ER MIN HR MIN I'fO DA YR ËR M3N
CNT
(tfIN)
GROSS
COUNTS
GROSS
WT IN 2-
Lf.D+SÀMPLE
Ðr 2 s COùÎ{ENTS
RÀÐON
/m's
A BIÀNK 3
A BIANK 4
A103
A104
7
7
5
5
7
7
10
10
6 18 7
618 7
9
9
33
33
10
10
0.01
0.00
0-06
0.06
0. 08
0.08
L582
1565
207 .7
2L0.8
CONTROL
CONTROL
A\IERAGE BLã¡ùK CAI{ISTER À¡IALYSIS FOR TEE CELL 2 BEACEES REGION: 0.00 pCi,/m's
Page 1 of 1
li
'v JJ,
GLIENT: DENISON MINES PROJECT: RADON FLUX MEASUREMENTS, WHITE MESA MILL PROJECT NO.: 07004.00
PILE:3 BATCH: C SURFACE:SOIL
AREA: COVER DEPLOYED: 6 14 7 RETRIEVED: 6
FIELD TECHNICIANS: MG,CS,DLC COUNTED BY: DLC
COUNTING SYSTEM l.D.: M01/021, M0ZD20 CAL. DUE:6/07/08
BLANK CANISTER ANALYSIS:
AIR TEMP MIN: 57"F
15 7 CHARCOALBKG:
DATA ENTRY BY: DLC
WEATHER: NO RAIN151 cpm W[ Out
TARE WEIGHT:
180.0
29.2
g.
g.
GRIÐ
IJOCATION
SÀl'4PlE RETRMI¡ÀLYSI S MID-TIME
I, Ð. gR MIN [R MIN I'fO DA TR IR MTN
CNT
(MIN)
GROSS
couNTs
GROSS
WT IN
tLDt
's COìÂ{ENTS/m's
RADON
/mt s
C BLANK 3
C BLANK 4
c103
c104
10
10
10
l_0
10
L0
15
15
677'7
677 7
20
20
2't
27
2]-0 -9
208 -8
0.03
0_03
10
10
7'7].4
t7 4t
0
0
0_
0.
04
05
04
04
CONTROL
CONTROL
A\|ERAGE BLåI¡K CAì¡TSTER ÀNALYSIS FOR TEE CEI,I, 3 COVERTD REGIOII: 0.04 pCilm's
.
Page 1 of 1
)
Appendix D
Sample Locations Map (Figure 2)
D