DRC-1997-001001 - 0901a06880805786

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NESHAPS RADON FLIIX MEASIIREMENT PROGR,AI{
White Mesa Mil1, L997
PrePared for:
Internationaf Uranium (USA) Corporation
5425 S. HighwaY 1-9L
Blanding, Utah 845LI-
PrePared bY:
Tellco Environmental
1-231 N. 23 St. , Ste. 206
Grand rfunction, Colorado 8L505
Nowerrlcer 1997
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1.0
2.0
?n
4-0
5.0
Table of Contents
TNTRODUCTION
SITE DESCRIPTION
SA]VIPLER DESCRIPTION
FIELD OPERATIONS
4.7 Generaf Site Specific lnformation
4.2 Sampl-er Placement
4.3 Sampler Retrieval
4.4 Site Exit
4.5 Environmental Condltions During Measurement Periods
I,ABORATORY OPERATIONS
5.1 Introduction
5.2 Apparatus
5.3 Analysis Procedure
5.4 Weighing and Background Counting
5.5 Receipt and Weighing of Exposed Charcoal
5.5 Gamma Ray Counting
5.7 Quality Control- Samples
5.8 DaCa Va-LldaE10n
5.9 Calcul-ations
P,age
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L2
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5.0 SAMPI,E RESULTS/CAICULATIONS
Figure 3-1, l,arge Area Activated Charcoal Col1ector Diagram
APPENDICES:
A - Support Documents
B - Recount Data
C - Radon Flux Sample Laboratory Data and Field Bl-ank Data
D - Map Pocket, Eigure 5-1
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. ...'::.:.i:..:::::.. ',,..,...:... i: .. ..:.:.:::..:. :::
DEPARTMENT OF ENVIRONMENTAL QUALITYDIVISION OF AIR QUALITY
150 Nortlr 1950 West
P.O. Box 144820
Salt Lake Ciry, Urah 841 I 4-4820
[phone] Voie
[phone] Fax
[phone] T.D.D.
Michael O. LmvittGokmor
DameR.Nielson,Ph.D. i.iExecutiE Director t,,
Ursula K. Truemm, P.E. ii:Director
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May i9, 1998
Ron E. Berg
International Uranium Corporation
Post Office Box 809
Blanding, Urah 84511
DAQH-0735-98
Dear Mr. Berg:
Re: Annual Radon-222 flux report for White Mesa Mill
The Division of Air Quality has received your annual radon-Zl}flux report for the White MesaMill' The information contained in the report has been reviewed by the Division of Air eualirtyand found to contain the following deficiencies:
1' The report provided by International Uranium Corporation does not contain thestatement andsignature of a corporate officer in charge of the facility required by 40 CFR61, Subpart W, $ 61.254(a)(4).
2' There are several apparent errors in data entry on the spreadsheet used by TellcoEnvironmental to calculate the total radon flux for cell 3. The apparent errois include:
Deploy time for canisters D-50 through D-53 should read 10:56 through 10:59rather than l1:56 through 11:59.
Counting mid-time for canisters L-19 throughL-24 should read 10:00 through10:05 rather than 9:00 through 9:05.
Deploy time for canister L-87 should read 15:59 rather than 16:59.
Please provide the statement and signature of a corporate officer in charge of the facility requiredby,40 CFR 61, Subpart w, $ 61.254(a)(4) to resolve deficiency #1. No response is necessary fordeficiency #2. The apparent erors in data entry all result in over reporting or tn. radon flux andare not sigfficant.
Please provide the information requested above within 30 days of this request. If you have anyquestions, please contact Bryce Bird of my staffat g01-536;064.
DAQH-0735-98
Page2
Thank you for your cooperation in this matter.
Sincerely,
UKT:BCB:ds
cc: Tellco Environmental
EPA Region VIII, Lee Hanley
Southeast Utah District Health Dept.
IxrERxlrIoNAl,
Llnaxrur,r (usa)
ConponnrloN
6'125 s. IIui'. 191 ' Po. B.x809 . Blandi,g, UT845Ir . 801 678222I (phone) . gOt 678 2224(f",')
June 18, 1998
Ursula K. Thurman
Executive Secretary, Utah Air Quality Board
Department of Environmental Quality
Division of Air Quality
150 North 1950 West
P.O. Box 144820
Salt Lake City, Utah 84114-4820
Dear Mrs. Thurman
Re: Annual Radon-222 Flux Report
Please find below the certification for International Uranium (USA) Corporation, White Mesa Mill,
Blanding, Utah, Annual Radon-222 Flux Report which was omitted in the original report. This
information is provided pursuant to 1 0 CFR 61, Subpart W , 6l .254 (a) (+)
"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."
Sincerely,
William N. Deal
Plant Manager
WND/gpI
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NESHAPS RADON FLTIX MEASTIREMBNT PROGRAM
fnternationaf Uranium (USA) Corporation
white Mesa Mil]
6425 S. Hwy. 191
Blanding, Utah 84511
1.0 INTRODUCTION
During September 1997, Tell-co Environmental L.L.C. (TeIlco) provided support to
Internatj-onal Uranium (USA) Corporation (hereinafter, IUC) regarding their
reguired National Emission Standards for Hazardous Air Pollutants (NESIIAPs) Radon
F1ux Measurement effort on Tailings Ce1ls 2 and 3 at the White Mesa Mill uranium
processing facility in BJ-anding, Utah. These measurements are required of IUC to
show compliance with 40 Code of Federal Regulations, Part 61, Subpart W, National
Emissj,on Standards for Radon Emi-ssions from Operating MiI1 Tailings. At present,
there are no Subpart T uranium mil-I tailings at this site. As required by the
regulations, the NESIIAPs monitoring for existing mil1 tailings piles j-s a flux
standard that Lj-mits the emj-ssion of radon from piles. The standard limits the
amount of radon that can be emitted per unit area (m2) per unit of tlme (s). This
standard is not an average per facility, but is an average per radon source.
According to subsection 6a.252 Standard, (a) radon-222 emissions to ambient air
from an existing uranium mill taj-lings pile sha1l not exceed 20 pCi/m'?-s of radon-
222. Subsection 6L.253 Determinj-ng Compliance, states that: "Compliance with the
emission standard in this subpart shall- be determined annua11y through the use of
Method 115 of Appendix B. r'
Tell-co was contracted to provide radon
placement/retrieval- and sample analysis of the
This reporL addresses the procedures employed
Section 6.0 of this report.
col-Iectors, perform the f i-e1d
coll-ectors for calendar year 1997.
to obtain the results presenLed in
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2-O SITE DESCRTPTTON
The White Mesa Mi1l is 1ocated south of Blanding, Utah on Highway 191" The mil1
began operations in 1980 for the purpose of extracting uranium and vanadium from
feed sLocks. Processing effl-uents from the operation are deposited in four
I'f ined" cel,Is which vary in depth. Cel-l,s 1 and 4 are used solely f or "1i-quor"
storage, whj-Ie Cel-l-s 2 and 3 are used for sand tailings,/liquor deposition.
Cel1 2 has a total area of approximately 270,624 square meters (m'). This ce11
was comprised of two source regions that required NESHAPS radon monitoring:
approximately 233,095 m2 of the cel-I had a soil cover of varying thickness, with
approximaLely 37 ,529 m2 of exposed tailings "beaches". There was no signigicant
standing liquid in "l-owrt elevatj-on areas wj-thin Ce11 2.
Cell- 3 has a total area of 288,858 m:. Thi-s ce}I was comprised of two source
regj-ons that. reguired NESIIAPs radon moni-toring: approxj-mately 85, 357 m2 of the
cefl had a soil cover of varying thickness, with approximately 40,396 m'of
exposed Lai1j-ngs "beaches". Ihe remaining approximat.ely 163,105 m'z was covered
by standing liguid in "l"ow" elevati-on areas.
Due to worker health and safety concerns expressed by both IUC site personnel and
Tellco monitoring staff, some of the areas of the weL beaches of Cefl 2 and CeI1 3
were not sampled due to the extreme instabil-ity of wet tailings beaches.
3.O SA]V]PLER DESCRIPTION
The Large Area Activated Charcoaf Canj-sters (LAACC) used by Tel]co personnel to
perform the required radon measurements were fabricated in conformance with "Radon
Flux Measurements on Gardinier and Royster Phosphog),?sum Piles near Tampa and
Mulberry, Florida" (NTIS Document #PB85-16a874) as referenced in 40 CFR, Part 61,
Method 115, Appendix B. This method of performing radon flux measurements
involves the adsorption of radon on actj-vated charcoal in a large-area coffector.
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The charged collector is placed directfy on the
and is al1owed to col-lect radon for a given time
The radon coll-ected on the act.ivated charcoa] is
spectroscopy.
material surface to be measured
period (approximately 24 hours).
then measured by means of gamma
Each LAACC was constructed using a 1O-inch diameter PVC end cap, spacer pads,
charcoal distribution grid, retainer screens, pads, and a stee] retainer ring (see
Figure 3-1) .
Prior to deployment, each collector was charged with 1Bo grams of baked charcoa]
from sealed individual sample containers (reference Section 5. O below for
laboratory procedures). After the 24 hour measurement period, the exposed
charcoal was transferred to the pfastj-c sample containers, sealed air-tight (wj.th
tape), labeLed as to sample identification along wj-th exposure times/dates, and
transferred to the Te1lco laboratory (Grand Junction, Colorado) facility for
anaJ-ysis .
4.7
FTELD OPERATIONS
Generaf Site Specific fnformation
Te1lco personnel laid out basellnes along the sldes of Ce1ls 2 and 3, and a grid
coordinate location system was developed to accommodate locating the samplers in
the field.
The sampling effort commenced on the morning of Sept.ember 17, 1997, after site
specific health and safet.y training provided by IUC Health and Safety personnel-.
Te11co field technici.ans laid out the grid system on CeI1 2 and CelI 3 using a
measuring tape, pacing, and line-of-si-ght markings. Boundary distinctions between
the three source regions were established by visual inspecti-on and so noted on the
field maps. Teflco personnel placed a minimum/maximum thermometer within each of
the two ce1ls, respectively, during sampling, measuri-ng ambient aj-r temperatures
at the site, to monitor compllance with the 35"F measurement criterion.
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I -in. Thicl
Scrubbst Pad
I /2.rn Thick
Scr,:bbsr Pad
1 ./ 2- tn Tlrrch Charcu.l
Support Qrrd
Rc I a rnor
Spr rng
l0.rn. dia
PVC End Cap
FIGURE t Large-Area Radon Collector
I /4-in. Vont Hole
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4.2 Sampler Pl,acement
Radon measurements were made in conformance with methods described in NTIS
DocumenL #PB85-l-51-8'74 fot: each 100 sample measurement set for each source regi-on.
In addition to the 100 samples, each sample set consisted of 58 field blanks. The
spacing distribution for each set of 100 measuremenLs was determined by visual
means and a "best fit" distribution pattern for each source region. Field
personnel safety was paramount in the distribution of samplers over ,,wet beach"
regions due to the 1oose, unconsolidated condition of the saturated tailings,
which are similar in consisLency to "quicksand.',
Placement/retrieval of collectors was accomplished using vehicles where possible,
and by foot travel where vehicle travel was not feasible.
A collector was chosen and the retai-ning ring, screen and foam pad removed to
expose the charcoal- support grid.
from a batch, opened and distributed
The col-fect.or was then re-assembl-ed
be measured. Care was exercised not
The collector rim was "seafed" to
A pre-measured charcoal charge was selected
evenly across the area of the support grj.d.
and gently placed face down on the surface to
to "push" the device into the soj-f surface.
the surface using a berm of locaf borrow
materj-a1 (either tailings or soif) to reduce dilutj-on due Lo air or wind currents
within the col-lector.
A sample identificatj-on number was then assigned to the collector. Sample numbers
utifized an al-pha-numeric system composed of the charcoal batch letter (i.e., A,
B,C ) followed by a sequential number indicating the placement (i.e., 01,
02, . ) . This sample identification number was recorded on an adhesive 1abel
and placed on the top of the collector. The sample ID, date, and time of
placement were recorded on a master data sheet for each set of measurements.
During placement of charcoal flux col-fectors, five field blanks were coflected.
The procedure for preparing a field blank was to charge a collector with charcoal,
and place iL inside an air-tight container. fhe blank(s) remained in the seaLed
collector for the 24-hour sample time period.
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4.3 Sampl-er Retrieval
Retrieval of the collectors followed the same pattern as placement. The
collectors were disassembl-ed and the charged charcoal removed by pouring from the
collector into a large funnel suspended above a sampJ-e charge container. The
sample ID number was transferred to the charge container which was sealed and
placed in a box for transport, The date and time of ret.rieval were recorded on
the same data sheet. as the sample placement information,
Each charged collector was retrieved upon completion of the measurement time
period (approximately 24 hours). Upon retrieval of the col-fectors, the field
blanks were retrieved and the charged charcoal returned to a container, seal-ed,
and Labeled as such, and returned for analysis a1ong wj-th the measurement set.
Sample data sheets accompanied the shipment to t.he laboratory. During retrieval
of LAACCS on Cel-1 2 Beach region, Lhe charcoaf from one of t.he coffectors (A73)
was spilled during handling, and the sample was lost.
During placement of collectors on Ce]l 3 Beach regj-on, Lhe LAACCs at Lwo adjacent
sample locations were initially labeled as "D22". The samples were labeled as
"D22A" and "D22B" upon retrieval; one of the duplicitous samples (D228) was re-
j-dentified as sample D99, which was missing. During retrieval of the collectors
on Cefl 2 Cover region, one of the LAACCs (fsz) was found to have a hairline crack
in the PVC shell, and was replaced by a spare (exLra) LAACC before proceeding with
the sampling of the subsequent (and final) regi-on, CelI 3 cover region.
Tel-lco personnel maintaj-ned custody and assured timely delivery of the samples to
the Tel1co Grand Junction laboratory for prompt analysis of the charcoal samples.
4.4 Site Exit
Tellco field personnel and equipment were alpha scanned for possible contaminati-on
resulting from flefdwork activit.ies. A11 equipment and field personnel were
surveyed and released for unrestricted use by IUC's Health and Safety personnel.
(a)
(b)
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4.5 Environmental- Conditions during Measurement periods
Referencing 40 cFR, part 61, subpart w, Appendix B, Method 115 - Monitoring for
Radon-222 Emissions, Subsection 2.7.4 - Rest.rict.ions to Radon Fl-ux Measurements,
"the fol-lowj-ng restrictions are placed on maki,ng radon flux measurements:
(a) Measurements sha11 not be initiated within 24 hours of a rainfa]l.
(b) rf a rainfall- occurs during the 24 hours measurement period, themeasurement is invalid if the seal around the 1ip of the collec1orhas washed a\ray or if the colleetor is surrounded bv water.
(c) Measurements shal-1 not be performed 1f the ambient temperature isbefow 35oF or if the ground is frozen. "
Site Specific Discussion
Pri-or to commencement of any sampler placement, rainfall amount.s (i-fany) were ascertained at the ruC weather station rain gauge and/or atthe rain gauge placed in the immediate area by Telrco fieldpersonnel. No measurabl-e rainfal] occurred during the 24 hour periodpreceding placement of the LAACC samplers at the site.
LAAcc placement commenced on the morni.ng of september a7, lg97 onCel-1 2 Beach region.Overnight (September 17-18, 1,997) animmeasurabl-e trace of water was collected by Tel1co,s rain gauge;while ruc's rain gauge measured no rainfal]. After a discussion onseptember 18, 1997 between ruC, Tellco, and the state of utah,s on-site representative, a consensus was reached. t.hat the immeasurabletrace of water coll-ected in Te11co, s rain gauge wourd not preventthe placement of LAACCs; pfacement of LAACCs proceeded on the nextregion, Cell 3 Beach on September 18 , t9g7.
Rainfal1, gauged at 0.12,, , occurred overnight, September 18-19,L997, after the placement of LAACCs on Celr 3 Beach. Al1 of rheseals from cel1 3 Beach region remained. int.act, and none of thecollectors were surrounded by water. More rain was forecast and rucdecided to demobilize Te1lco's field crew until the forlowing week.
TeLlco remobilized to the site the following week and measured norainfal] throughout the pracement and retrieval- of coll-ectors on cel-l-2 Cover regi-on (September 23-24, t997) and Cel1 3 Cover region(September 24-25, 1-997) .
During all 24-hour sample set placements, the minimum ambient airtemperature recorded by Tellco at the site was 44"F, recordedovernight Septerrlf,er 23-24, L997 _
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5.0 LABORATORY OPERATIONS
5.1 Introduction
Activated charcoaf gas adsorption collectors are passive sampling devices used to
determine the flux rate of radon-222 gas from a surface area. The charcoal"
canister used consists of a 10-inch PVC cap containing a bed of 180 grams of
activated, granular charcoal- placed in a di.strj-bution grid on top of a 1X inch
thick layer of foam and secured under a X inch foam layer and a galvanized steel
screen by a retaining ring.
Sample collection is initiated by placing 180 grams of unexposed charcoal from a
sealed container int.o the above described canister and, after securing the
retaj-ning ring, placing the canister (open face down) onto the surface to be
tested. Radon gas is adsorbed on the contained charcoal and subsequent
radioactive decay of the entraj"ned radon resul-ts in the occurrence of radioactlve
lead-214 and bismuttr-2L4 in the canister.
These radon progeny isotopes emit characteristic gamma photons which can be
detected. The original totaf activity of the adsorbed radon can be cal-culated
from these gamma ray measurements using empirical calibration factors derived from
cross-calibration of source standards containing a known total, activity of radium-
226 in a geometry identical to the samples Lo be counted.
q?
a
Apparatus
Single- or mul-ti-channel- pulse height analysj-s system, Ludlum Model, 2200 with
a Teledyne 3" x 3" Naf(T1) detector.
l,ead shielded counting well approximately 4o cm deep with 5 cm thick fead
walls and a 7 cm thlck base and 5 cm thick top.
NIST traceable aqueous solution radium-225 absorbed onto l-80 grams of
acLivated charcoal cafibration source.
Ohaus Model C501 balance with 0.1 gram sensj-tivity.
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5.3 Anafysis Procedure
Inspection of tbe Charcoal Container
Charcoal was received at the analytical
containers. Upon receipt, the integrity of
inspection of the pl,astic container.
Sarple Ident.if icat,ion Nr:ribers
Each sample container had a unigue sample
determi-ned in the fie1d, and written onto
container.
identification number which was
a label attached to the sample
radon flux measurements.
and for charcoaf recycled
11ooc. Drying procedures
J.aboratory in
the container was
the sealed sample
verified by wisual
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Drying and Recycling
A1l charcoal was drled before use in the field for
Procedures were the same for newly prepared charcoal
after fj.el-d use. Charcoal was dried at approximately
were as folfows:
qA
Oven temperature set to 110'C.
Charcoal pLaced in the oven in a metal baking tray.
Baked for 24 hours.
Immediately aft.er the tray was removed, approximately 180 grams of charcoal
were transferred into cfean sample containers and sealed wj-Lh plast.ic tape.
Weighing and Background Counting
Proper balance operation was verified daiJ"y by checking with a standard weight.
The balance readout should agree with the known standard weight to within 1 0.1t.
ff a discrepant readout was obtained, the ba1ance was re-zeroed., the check weight
wiped wi-th a soft, ]int-free cloth, and re-weighed" If the d.j-screpancy persisted,
the balance would have been removed from servj-ce and tagged "Out of Service.,' For
this project, the scale conformed for each day of use (See Appendix A, Balance
Operation Dai-ly Check form).
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After acceptable ba1ance checkout, each empty container was individually placed on
the balance and the t.are weight of Lhe container was documented to the nearest 0.1
grams on the label. The sca]e was re-zeroed with the container on the bal-ance.
Charcoal was carefully added to the container until the readout registered
approximately 180 grams. The lid was i-mmediat.ely placed on the container and
sealed with pl-astic tape. The tape was stretched slightly whil-e wrappi,ng around
the container. The end of the tape was foLded to form a tab for easy tape
removal. The bal,ance was checked for readout drift bet.ween each container
weighing st.ep.
Gamma ray counting system checkout was performed as described in Section 5.6. A
five-minute background count was acquired for five containers selected at random
to represent the "batch. " Each seal-ed cont.ainer was placed individual-1y in the
shielded counting we1l, with the bot.tom of the container centered on the detector.
Observed empty counting well background counts must fal-l within the average range
of approximately 115 to 166 cpm using the aforementioned Ludlum/Tel-edyne counting
sysLem with shielded well. The background count rate was then documented for the
five containers, and subsequently documented on the respective "Rad.on Flux Field
Data Sheet" for that. batch. If the background count.s were too high Lo achieve a
sufficiently ]ow sensitivity 1evel (Lower Level of Detection, LLD), the entire
batch was labe]ed non-conforming and recycled through the drying process.
5.5 Receipt and Weighinq of Exposed Charcoaf
Containers of exposed charcoal were transported from the site and delivered to t.he
laboratory for anal-ysis by Tellco personnel. The Tellco laboratory staff was
responsible for weighing and inspecting the exposed canisLers; inspecting ;he
documentation forms; and entering the required data documentation to dat.abase
spreadsheets.
When the containers were received,
o Containerh/as closed and sealed
o Container was not damaged.
. Data sheet was complete.
the fol-lowing items were inspected:
with tape.
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Discrepancies found during the recelpt inspection were documented on the data
sheet.
Containers received open or damaged resulting in seaf failure were considered void
and were not analyzed. A11 samples were received i-n good physical condition at
the Tellco laboratory and no samples were lost or destroyed during transport,-
however, two conLainers from Ce]] 2 Cover region (T12 and T14) had no tape seals
upon inspection at the 1ab.
After receipt inspections, eonforming contaj-ners were wej-ghed on a balance to the
nearesL 0.1 gram and the gross weight was logged on the "Radon Flux Field Data
Sheet" under the appropriate column.
5.5 Gamma Rav Countinq
was subjected to
background and
f measurements. (Appendix A of t.his report contains
I performance check records. )
Source/Baekground Checks
The charcoal gamma ray counting system
when used. These checks included
performance checks daily
radium-225 check source
daily counting system
Sample Analysis
. The length of counL time was determined by the activity of the sample being
analyzed. A data quality objective estabfishing a minimum accruement of 1000
counts for any given sample was foLlowed during sample analyses.
The sample
Lhe center
One sample
documented
The sample
container was placed in the countlng wel-1 with the l-id side up and
on the Naf detector and the shielded well- door was set into p1ace.
count was accrued and
on the fiel-d data sheet.
counts were documented on
the mid-sample count time and date was
the field data sheet for data reduction.
The above steps were repeated for each exposed sample coll-ector.
Approximately 103 of the containers counted on a given date were selected forrecounting. These containers were recounted no sooner than 1 day and no
longer than 10 days fo1l-owing the orj-gina1 count.
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5.7 Ouafity Control Samples
Charcoal f1ux measurement QC samples incfuded the followi,ng intra-faboratory
analytical- objectives as required in 40 CFR, Part 61,, Subpart W, Appendix B,
Method l-i.5, 4.0 - Quality Assurance Procedures for Measuring Ra-222 F1ux, D.:
. recounts, 10?, and
r field blanks, 58.
5.8 Data Vali-dation - Recounts/Blanks
A11 sample canj-ster data were subjected to validation protocoJ-s. The following
presents the data validation results:
Forty recount measurements were performed by conducting replicate analyses of
individual field samples. These recount measurements comprised approximatel-y 10t
of the total number of samples anal-yzed. The precision of all recount measure-
ments ranged from less than 1t to 7.7* wi-th an overal-} average precision of
approximately 1.98. This recount precision
variabillty of the analytical method.
is wefl within the expected
Twenty field blanks were analyzed by measuring the radon progeny activity in
samples subjected to all aspects of the measurement process, excepting exposure Lo
the source region. These blank sample measurements comprised approximately 5& of
the fi-eId measurements. The results of the blank sample analyses measured radon
fl-ux rates which were less than or equal to 0.2 pCi/m2-s, which corresponds to
l-ess than 1.08 of the regulatory limit of 20 pCi/m'z-s.
The objective is 100 samples to
regulations. The following is
sampling program (EPA rul-es
object.ive) :
be collected from each region, as specj-fled by the
the actual completeness aLtained during Tellco's
and regulations specify an 85t completeness
100 samples = 100t completenessCe11
Ce11
Cover
Beach2,99 samples = 99?; completeness
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r Cefl 3, Cover - 100 samples = 100E completeness
. CeLl, 3, Beach - 100 samples = 100& completeness
As presented above, actual QC validation met the objective parameter requirements"
5.9 Calcu1aLions
Radon flux rates were cafculated for charcoal- collection samples using cal-ibration
factors derived from cross-calj-brati-on to sources with known totaf activlty with
identical geometry as the charcoal containers. A yield efficiency factor was used
to calculate the total activity of the sample charcoal containers.
In practice, radon flux rates were calcutated by a database computer program. The
algorithms utilized by the data base program were as foll-ows:
Eguation 5.1:
pCi Rn-2227mtsec ITs*A*b* 0 . 5 (d'ls1'7s) I
where: N = net sample count rate, cpm under 220-662 keV peak
Ts = sample duration, seconds
b = instrument calibration factor, cpm per pCi; current vaLue:
0.17110
d = decay time, elapsed hours between sample mid-time and count
mi-d- t ime
A = area of the colfector, m2
Equation 5.2:
20error=2x
-1\/
-
V sampfe count. t. min + Bkqd count t. min
Net epm (samPle concentration)
13
Equat,ion 5.3 :
2.71 + (4.5s) (S.)LLD = ---------------- .,-
ITs*g*5*6 . 5 (a/gr'zs' ]
wheret 2.77 = constant
4.65 = confi-dence interval factor
Sb = standard deviation of the background eount rate
Ts = sample duration, seconds
b = instrument caLibration factor, cpm per pCi; current value:
d = decay time, elapsed hours between sample mid-time and count
A = area of the collector, m2
17110
mid- time
6.0 SA]UPLE RESULTS/CAICULATIONS
Referencing 40 CFR, Part 61, Subpart W, Appendix B, Method 115 - Monitoring for
Rador,-222 Emj-ssions, Subsection 2.1-.7 - Calcufations, "the mean radon f}ux for
each region of the pile and for the total, pile shall- be calculated and reported as
follows :
The individual radon flux calcul-ations shal-1 be made as provided in
Appendix A EPA 86(1). The mean radon flux for each region of the
pile shall be cal-culated by summing all individuaf ffux measurements
for the region and dividing by the total number of flux measurements
for the region.
The mean radon flux for the totaf uranium miIl tail"ings pile shaff be
calculated as fol-lows:
J'A' + J2A2 [+l JiAi
--A.
(a)
(b)
Where: J" = fqssp
Ji = Mean
A = Area
A - Tnts:l
flux for the total pile (pci/m'z-s)
flux measured in region i (pci/m'?-s)
of region i (m')
area of the pile (m2)
2.L.8 Reporting. The resufts of i-ndividual f1ux measurements, the
approximate focations on the pile, and the mean radon flux for each
region and the mean radon flux for the total stack [pile] shall- be
incfuded in the emission test report. Any condition or unusual event
that occurred during Lhe measurements t.hat coul-d significantly affect
the results should be reported. "
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a:
Site Specific Sarple Results (reference Figure 5-1)
(a) the mean radon flux for each region within each ceIl i-s as follows:
Cell2-CoverArea
- Beach Areas
= 7.4 pCi,/m'?-s (based on 233, 095 m2 area)
= 41.3 pCi/m'z-s (based on 37,529 m2 area)
CeII 3 - Cover Area = L4.5 pCi/m'?-s (based on 85,357 m2 area)
- Beach Areas = 89.2 pCi,/m'?-s (based on 40,396 m2 area)
- Standing Liquid Areas = 0 pCi,/m'-s (based on 153,105 m2 area)
Note: Reference Appendix B of this report for entire summary for
individual, measurement results and specifi-c sample regi,on maps.
(b) Using t.he data presented above, we have calculated the total- mean radon f]ux
for each pj-Ie (cell) as foflows:
Cetl 2 = L2.1 pCi-/m'z-s
(7 .a\ (233 .095\ + (41,.3\ (37 .529)
210,624
Cel] 3= 15.8pCi,,/m2-s
(14.5) (85.3s7) + (89.2) (40.396) + (0) (163.105)
288,858
!
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APPENDIX
Support Documents
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wh;]c t4,"^ flill 1y6slilF,
BALANCE OPERATION DAILY CHECK
Ba'lance Moder' O#,{hs },r}-a-,g.*'^,f
Standard Weight (g): \O0.0
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Dat e
lltt/qt I zq\,q
Pre-check (g) post-check (g) O.K. t O.1x
211,,7 ,l
Yc:>
By
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j'{d
D",T
i "rtPt.\, ,\
vJh;+c /4*^ /h;ll
NC: /lAP"
Calihration Check Lo8
sysrcm a, {ylo t/ yz t calibration oot , bf t{</qz
Scaler SN: ln) I High volragc: : 100 O wiodow: ---J.12-- Tlueshold:
-j2Q-
CThRCOAL CANISTER ANALYSIS SYSTEM
Duc Datc: t,l tf/q f
DcteclorSA.I: I;71 SourcclD&SAI;\r^ZZt' Oso'l/ t-so't SourccActivi, 5't/'Z Al'"
2o- ltf rc la;3o= loz. 16ltaO
zo- qrg)b loLl {b 3o= q75O _w tL'b3'j
Tccbnician;
Blank Csni$rcr Bkgd' Rangc, cPm:
Grorc Sotucc Raogc, cPm:
Y=DailyavcraSgbackgrouudandsourcecpmtallswithintheconuollimiu.
N = Daily ur.*!" background or sorucc cpm doce not fall within the control limits'
The acccptablc raDgcs wcrc &rcrrnilcd fic.m prcvious background and sourcc cbcck daU'
Sourcc Counl (l min. caclr)Count (l min. ca.)
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wh,'le rt'1r.s^ M,')l
rVESA A I.
svstcm to, /ylo z / It>o caribrarion sor* l,f lt/q z Duc Darc: t" / t r/qy
Scnler s/l.I: tv10 z Higb voltagc , L b s o window: 4a2 Tl,cshold: 220
DctcctorS/l.I: b ZO Sourcc ID & S/N: \o 2z t ( "tov /f rSo, Sourcc Acriviry : Sq 3 Al( i
llla* Cudstcr Btgd. Raogc, cpm:
Groes Sourcc Rangc, cpri:
2o- l7 Ll a lba Jo=l/3 ro /)7
Tccbnicinn:
Thc acccpublc rlr]Bcs wcrc dclcrmincd from prcvious brckground aod sourcc chcck daa.
YA.I: Y - Daily sverage backgrouod aod source cpm falls within the conrol limits.
N - Dnily avcragc background or sourcc cpm docs not fall witlrin lhe control linrils.
CHARCOAL CANISTER ANALYSIS SYSTEM
Calihration Check I og
2o- l0DqL/bto677 to- 79q15' ..t06:->
tsackground Count (l nrin. ca.)Source Counl (l min. each)OK?
Datc tsy #t fl2 fl3 Avg.frt il2 il)Avcragc YN
1llkr',,t l.l i 15.l3oi l,l L/I 00.6 )lct46 t00su l0ttl 2
l/ts /,tt A I t'C lbz I bt)lh t t01)a o lozrq ll/,f /167,:,- ^-2 /
UIZfi7 IL2.I4LI 17r 1.3*'0(:'i i l0?)K cl q.r; j rO t(,tta \,
't/zzh-t Itro I t,o {oi I t, t 'l1qK r0zrt t0l0t l0 t o.a V'lz i,Iql []l tl,7 13.;I L,n I (Ll rnt{b ;1)947, t0og5 lot<7 lot 3l V
Jqz lrl 7 lrl 5 t\c l0tltt l{) (.tct5 lnz>z /or{?'>Y
'rlw'/q-&u tll0 lt{lz 7t lLt*tat \.latsT l^(z o lDt?.k,Y
t3{t7)3(l3\t O 2/irq lQtOa 4csc /otlo Y
TO
TO
166
177
145
146
151
136
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RADON CI.I]ARCOAL CANISTER SYSTEM
TWO AI{D THREE 8IG'UA RAI.TGE CNT.CUT.INONS
Calibration Date: 6/ig,?7 Calibration Dus;Sourca Acrivigr S9,3OO p0i Ra 226 "". i*r..
8KG 1
122
14
133
1t{
155
162
148
170
156
148
161
126
158
143
1rc
156
150
146
146
146
152
1.16
148
'142
137
BKG 2
130
148
160
160
145
152
155
146
153
140
149
1U
132
147
161
149
124
153
143
't51
144
151
151
137
151
144
142
133
6/18A8
BKG 3
130
144
132
122
150
154
151
153
149
135
155
147
140
140
157
141
151
138
142
141
118
142
123
151
131
151
143
161
SOURCE
10443
10,,O7
10400
10256
10619
10367
10410
10348
10727
103&r
10339
10375
10433
1M38
10/.82
10465
10353
10391
10142
106't5
1UO7
10396
10408
1033s
1M99
10327
10272
10390
10094
9948
0.17269
SOURCE 2
10157
10143
10337
10125
10584
10234
10219
10318
10630
10190
10/6,2
10216
10398
10416
10u4
10341
10438
10328
10129
10450
10o78
1 0582
10r''29
1041 1
10388
10401
10385
10242
SOURCE 3
10305
10751
10399
10822
10674
10329
10296
10278
10439
1021 5
10%7
10320
10415
1 0359
10350
10606
10435
10470
1 0344
10213
10516
10324
10617
10457
10345
10561
101 79
10200
1c677
1 0823
10385
SYSTEM ID OATEMAzO2A 5nus7MA?/Da0 5r21n7M02,D.20 5t3f,$7M02to2o 6nt97MOZ|D2O 68t97MVJOzo 6t4tg7MO7/Da} 6t487M02tD20 6/5/97MA2/D20 6/5t97M0ao20 6t6t97M02tD20 616€7MAADa} 6/10t97M02tD20 d1u97M0aD20 6t20t97M0ao20 613A97M02to20 6t3f,n7M02tD20 711t97MO2|D20 7t.U97MA2/O20 7nE7tvt0zlDz} Tt2tg7M0zo20 7Rt97MO2|D20 7tu97M02to20 7t9ts7|no2to20 7ts97MO2|O20 7t1uo9MOAOa} 7t1ot97M02to20 7t11t97M0zo20 7111t97
2o RANGE
30 RANGE
AVG
124 TO113 TO
MO2/O2O YIELD:
RADON CHARCOAL CANISTER SYSTEM
TWO AND THREE SIG$JIA RANGE CATCULATIONS
Calibratron Date: 6/1847 Calibration Duo:
Sourco Artivity: 59,300 pCi Ra % ea. Source
SYSTEM ID
M01/D21
MO1tO21
M01lo21
MO1tO21
M01/D2l
MO1tD21
MO1tD21
trutozl
M01tD21
tn01to21
M01lD21
rA01to?1
,YlO'l/021
M01/D21
Nt01lo21
MOUO21
M01/O2't
tvtO1/D2'l
M01/D21
MO1/D21
M01/D21
M01/D21
DATE
5n1t97
512187
5t2387
6tus7
6Rt97
6t4lg7
6t4ls7
6t5t97
6t5t97
6t1W97
6t13tg7
680137
6/30i97
7t1t97
7t1t97
7 t2t97
7t2t97
7t3ts7
7t387
7110t97
7 t1't tg?
7 tl1tS7
2o RANGE
3o MNGE
AVG
BKG 1
142
't34
147
't42
172
129
130
1U
144
14t)
155
126
147
155
139
141
134
126
142
162
147
149
BKG 2
140
13S
117
147
125
137
153
157
151
120
163
146
120
165
1U
137
171
145
144
143
131
127
d18A8
BKG 3
118
129
131
143
142
139
131
155
143
138
138
131
143
12s
120
135
144
133
140
136
124
115
SOURCE 1
10139
10350
10395
9964
10434
10406
10015
10283
10341
10470
10315
9935
10016
1 0362
10172
10098
10255
10152
10169
1 0029
10156
10152
SOURCE 2
10246
10277
10335
10264
10328
10369
10257
10220
10242
10055
10253
10005
10122
10184
10162
10052
10053
10120
10'141
9974
10179
10051
SOURCE 3
9995
14237
10443
10365
10201
10368
10212
10139
10313
10343
10371
9959
10162
10107
1M38
10103
10028
10034
1003r
9924
996'l
103b7
10486
I 0634
1C191
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9897
9749
TO 16iTO 177
140
115
102
MO1/021 YIELD:
GRAND AVERAGE ytELD (MO1/D21 I MOZD2O):
0.16951
0.17110
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APPENDTX B
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