Final Status Survey Report Volume III - Pond Parcel Excavation Backfill … · 2020-01-04 · (partially - along the Specific Systems Property), excavation backfill Survey Unit Kaiser-FSSB-003
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2. Description: Pond Parcel Excavation Backfill Unit
3. Net Th-232 Acceptance Criteria (pCilg): 31.1
4. Dimensions (m): Approximately 45 meters x 36 meters; Area, A (m2):..1647
5. Estimate of Gross Gamma Scan Background Readings (cpm)
Average: 80.000 Minimum: 50.000 Maximum: 100,000
6. Based on the maximum background gross gamma scan reading, the scan MDC (Minimum Detectable
Concentration of Th-232), the corresponding N (Minimum Number of Required Samples) and L (Triangular
C;rid Node Length) for a standard 2,000 m2 Class I survey unit are:
* Gross Gamma Scan MDC (pCi/g): 5.7
* Minimum Number of Samples (N): 9 Triangular Grid Node Length (L): 16.0 m
7. If the area of the Survey Unit is less than 2,000 n2 , recalculate the corresponding Triangular Grid Node
Length (LI) for the Survey Unit Area (A), using the following formula: LI = (A/(0.866 x 9 ))'2: 14.5
8. If N is greater than 9 and the A is other than 2,000 in2, recalculate the corresponding Triangular Grid Node
Length (LI) using the following formula LI = (A/(0.866 x N))"/2: N/A
S'. If A is greater than 2,000 n 2 and N is equal to 9, recalculate the minimum number of samples (Ni)
corresponding to a Triangular Grid Node Length (L) of 16 m using the following formula NI = A / (0.866 x
162), N,: N/A
10. Calculate the height (h) of the equilateral triangle with side length equal to L (or (LI) using the following
formula: h = ((L2 - (U2)2 )82: 12.6 m.
(Q:AP4000\PA4072\FSS Repots\Volume lIrSurvey Unit FSSB 04\Attachment B - Soil Survey Unit WorksheetuiSoil Survey Unit Worksheet No. I doc
I Soil Survey Unit Worksheet No. 2Random Number Generator for Start Point
Final Status SurveyThorium Remediation Project
Tulsa, Oklahoma FacilityKaiser Aluminum & Chemical Corporation
SURVEY UNOT: KAISER-FSSB-004
RANDOM START POINTx axis. ( Meters) y axis ( Meters)
40 1 lower boundupper bound
x axis y axis
45 36
cn
North3
(0,0) x axis
Q:\P4000\PA41)72FSS; ReportsVdoure IrSurvey Unit FSSB 004\Attachment B -Soil Survey Unit Worksheets'Soil Survey Unit Worksheet No. 2
ATTACHMENT C
LABORATORY ANALYTICAL RESULTS
Outreach- 'laboratory
i amW NorthAspenAL #Token Arrow. OK 74012(918) 251-2515FAX (918) 251.0008
tilc 10jbIrIt 0 IJune 7, 2005
David WeyantKaiser Aluminum & Chemical7311 E. 41st StreetTulsa, OK 74145
Project: Kaiser Thorium Remediation PA-4000-4072OUTREACH LAB ID: 20050396
Dear Mr. Weyant:
Please find enclosed the analytical report for your samples received in our laboratory onMay 26, 2005. Thirty three soil samples were received in good condition and analyzedfor Thorium-232. by Gamma Spectroscopy without drying and grinding and PercentMoisture with an expedited 5 work-day turn. Results were faxed June 7, 2005.
All Quality Control for the requested analyses is reported on the analytical report. Thelaboratory control standard and duplicates for all analyses were within method controllimits.
Your samples will be returned as requested.
Thank you for choosing Outreach Laboratory and if you have any questions, please callUs at 918-251-2515.
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RELINQUISHED B ME -RECEIVED BY: DATE TIME__My signature on this chain of cust dicates that I am authorized by the above company to release samples for analys. The company agrees to pay the entire balance upon receIpt | [K%"; "'; t'ofsamplaelaarlItIsunderstood and agreed that any balance caried over thirty (30) dy k subject to a t piSePr month (18% per annun) fate charge. In t evnt of defaut the companybecomes legally liable for any reasonable atomey andlor conectlon fes and an related coadt nscessary to remIt the entire balance to Outreach Tchnologe Inc. (Outreach Ldboratory).
SAMPLE RETURWDISPOSALAO nornhazardous sampies shabedisposed o M otdaysafterIsUeoffinaltOolAftnottieruwfi be r tumedet cgents exspenseC. -Y * ' - r. 9 i
OUTREACHLABORATORY
CHAIN.Z" CUSTODY
311 North AspenBroken Arrow, OK 740i2Phone: (918) 251-2515Fax: (918) 251-0008
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Results To:
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REMARKSt.E. FILTERED, UNFITERED,
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RELINQUISHED BY: 2 DATE TIME RECEIVED BY: DATE TlMiMy signature on this chain o1 custody form cates that I em authorized by the above company to reiease samples for analysis. The company agrees to pay th entire balance upon receiptot sample data and It Is understood and agreed that any balance carried over thirty (30) days Is sutbec to a 1.6% per month (13% per annum) late charge. In the ewnt oi default, the Companybecomes legally lPable for any reasonable attorney and/or collection fees and all related cost necessary to remit te entire balance to Outreach Technologies, Inc. (Outreach Labotoy).
SAMPLE RETiURN/DISPOSAL' Al non-hazardous samples shall be disposed of 30 days after sue Of ginal report. Al othere wil be returned at clents epense.
SAMPLE Lo IN
.Ce-t
Date Received: 5/25/05 12:47:17
Sample ClientNumber Sample lD
Lab Number: 20050396
Date Container ContainerMatrix Sampled Type Size
Due: 612/05
Custody SealSeal IntactPreservation
20050396-01 A K-675Percent M mista SLpec
Tb-232 by Gammna Spec
Soil
20050396-02 A K-676Percent Moisture (LOD)
Th-232 by Gamma Spec
Soil
05125/05 Plastic
05/25105 Plastic
05/25/05 Plastic
16oz
160z
16oz
None
None
None
No No
No No
No No20050396-03 A K-677Percent Moisture (LOD)Th-232 by Gamma Spec
Soil
20050396-04 A K-678Percent Moisture (LOD)
Th-232 by Gamma Spec
Soil 05/25/05 Plastic 16oz None No No
20050396-05 A K-679Percent Moisture (LOD)
Th-232 by Gamma Spec .
Soil 05/25/05 Plastic
05125105 Plastic
16 oz
16oz
None
None
No No
No No20050396-06 A K-680Percent Moisture (LOD)
Th-232 by Gamma Spec
Soil
20050396-07 A K-681 SoilPercent Moisture (LOD)
Th-232 by Gamma Spec
05/25/05 Plastic 16oz None No No
20050396-08 A K-682Percent Moisture (LOD)
I Th-232 by Gamma Spec
Soil
20050396-09 A K-683Percent Moisture (LOD)Th-232 by Gamma Spec
Soil
05/25/05 Plastic
05/25/05 Plastic
05/25105 Plastic
16 oz
16 oz
None
None
None
No No
No No
No No20050396-10 A K-684 Soil 16 ozDParp I
Percent :ire (LOD)
Th-232 b, ,mma Spect-1
20050396-11 A K-685Percent Moisture (LOD)Th-232 by Gamma Spec
Soil '05/25/05 Plastic
05/25/05 Plastic
16oz
* 16oz
None
None
No No
No No20050396-12 A K-686Percent Moisture (LOD)Th-232 by Gamma Spec
Soil
20050396-13 A K-687Percent Moisture (LOD)Th-232 by Gamma Spec
Soil 05/25/05 Plastic 16oz * None No No
20050396-14 A K-688Percent Moisture (LOD)Th-232 by Gamma Spec
Soil 05/25105 Plastic 16oz None No No
20050396-15 A K-689Percent Moisture (LOD)
Th-232 by Gamma Spec
20050396-16 A K-690Percent Moisture (LOD)Thn-232 by Gamma Spec
Soil
Soil
05/25/05 Plastic
05/25/05 Plastic
16 oz
60oz
None
None
No No
No No
20050396-17 A K-691Percent Moisture (LOD)Th-232 by Gamma Spec
Soil 05/25/05 Plastic 16oz None No No
20050396-18 A K-692Percent Moisture (LOD)Th-232 by Gamma Spec
20050396-19 A K-693Percent Moisture (LOD)Th-232 by Gamma Spec
Soil
Soil
Soil
05/25/05 Plastic
05/25105 Plastic
05/25/05 Plastic
16oz
16oz
16oz
None
None
None
No No
No No
No No. 20050396-20 A K-694Percent Moisture (LOD)
Th-232 by Gamma Spec
_ ,
Perce .sture (LOD)
Th-232 uy Gamma Spec
20050396-22 A K-696Percent Moisture (LOD)TIh-232 by Gamma Spec
Soil
Soil
Soil
05125105 a_ Plastic.7
05/25/05 Plastic
05/25105 Plastic
05/25/05 Plastic
16oz
16oz
16oz
16oz
None
None
None
None
No _J
No No
No No
No No
20050396-23 A K-697Percent Moisture (LOD)Th-232 by Gamma Spec
20050396-24 A K-698Percent Moisture (LOD)
Th-232 by Gamma Spec
Soil .
20050396-25 A K-699Percent Moisture (LOD)
Th-232 by Gamma Spec
20050396-26 A K-700Percent Moisture (LOD)Th-232 by Gamma Spec
Soil
Soil
05/25/05 Plastic 16oz
16oz
None No No
No05/25105 Plastic None -No
20050396-27 A K-701Percent Moisture (LOD)Th-232 by Gamma Spec
20050396-28 A K-702Percent Moisture (LOD)Th-232 by Gamma Spec
20050396-29 A K-703Percent Moisture (LOD)Th-232 by Gamma Sped
Soil
Soil
Soil
05/25/05 Plastic
05/25/05 Plastic
05/25/05 Plastic
16oz
16 oz
16oz
None
None
None
No No
No No
No No
20050396-30 A K-704Percent Moisture (LOD)Th-232 by Gamma Spec
Soil
Soil
05/25/05 Plastic
05/25/05 Plastic
16 oz
60oz
None No No
No20050396-31 A K-705 None No
ge 3
Percent lure (LOD)Th-232 b, ..Emma Spec
.e
20050396-32 A K-706Percent Moisture (LOD)Th-232 by Gamma Spec
- Soil 05125105 Plastic 16oz None No No
20050396-33 A K-707Percent Moisture (LOD)Th-232 by Gamma Spec
Soil 05/25/05 Plastic 16 oz None No No
CONTAINER INSPECTION A/I / W/#Coolers Custody Seals Broken Temperature Blue Ic Wet Ice Radiation Survey rfixed removable
SAMPLE INSPECTION
Custody Seals Broken - Chain of Custody Record6N Labels In Tact49N Radiation Survey Completedpq
Soil Survey Unit Worksheet No. 1Soil Survey Unit Worksheet No. 2
Laboratory Analytical Results
Q:\P4000\PA4072\FSS Reports\Volume llP\Survey Unit FSSB 005\FSSB 005 TOC.doc
Final Status Survey ReportVolume III - Pond Parcel Excavation Backfill Units
Sub-Report No. BCM-005Survey Unit Kaiser-FSSB-005Thorium Remediation Project
Tulsa, Oklahoma FacilityKaiser Aluminum & Chemical Corporation
March 22, 2006
1.0 BACKGROUND
This sub-report documents the results of pond parcel excavation backfill unit final status surveyactivities completed as part of the Thorium Remediation Project at the Tulsa, Oklahoma facility(Figure 1). Specifically, this technical report addresses the final status survey of Survey UnitKaiser-FSSB-005, which consists of a unit of Below Criteria Material or BCM (less than 31.1net pCi/g Th-232 material) placed in an excavation resulting from the removal of radiologically-affected soil from the Retention Pond area. Survey Unit Kaiser-FSSB-005 is considered a Class1 survey unit with an approximate base surface area of 1,716 m2. It is located on the east side ofthe pond parcel within the excavation bottom associated with Survey Unit Kaiser-FSS-016(Figure 3). The survey unit is bordered by excavation backfill Survey Unit Kaiser-FSSB-006 tothe north, a wall of non-impacted soil (clean import borrow material) to the south and east(partially - along the Specific Systems Property), excavation backfill Survey Unit Kaiser-FSSB-003 to the east (partially), and excavation backfill Survey Units Kaiser-FSSB-007 and Kaiser-FSS]B-008 to the west.
A total of seven 2-foot layers (lifts) of BCM was placed in Survey Unit Kaiser-FSSB-005.
Sepaxate distinct final status surveys were completed for the pond parcel excavation bottomsurvey units prior to backfilling with BCM. The final status survey of the pond parcelexcavation bottom survey units is documented in Volume I of the Final Status Survey Report.
This section of the sub-report presents the final status survey data for the BCM placed withinSurvey Unit Kaiser-FSSB-005. The final status survey consisted of a gross gamma scan of eachplaced 2-foot lift of BCM and systematic soil core sampling upon completion of the BCM unit.
2.1 Gross Gamma Scan
Each 2-foot lift of BCM was surveyed through a 100 percent coverage gamma scan to confirmaccej)table radiological conditions and identify any elevated areas. During the scanning of eachlift, the detector was held close to the BCM surface (1 to 2 inches) and moved in a serpentinepattern. Approximate equal-distant background measurements were also obtained at 1-meterabove the ground surface for each lift of BCM placed. A statistical summary of the backgroundsurvey and 100 percent coverage gamma scan of each BCM lift placed in the survey unit isprovided below in Table 1.
Table I - Gross Gamma Scan Results SummaryLift No. of Scan Std.
Area 2-sec. Rate Ave. Dev. Min. Max. MedianName Date (ne) Scans (m/s) (cpm) (cpm) (cpm) (cpm) (cpm)
Contour maps of the gross gamma background and final (as-left condition) scanning surveyresults are presented by BCM lift on Figures A-1 through A-7 contained in Attachment A.The 100 percent coverage gross gamma scan of the 2-foot lifts did not indicate the presence ofsmall areas (1 m2) of elevated activity (above the DCCL for the site).
2.2 Systematic Soil Core Sampling
The final status survey also consisted of systematic soil core sampling based on a random startpoint and an equal-distant triangular grid. The Minimum Number of Core Samples (core holes)Required (N) based on the scan MDC was determined to be 9, as documented on Soil SurveyUnit Worksheet No. 1 (Attachment B). Once N was determined, the Survey Unit Area (A) of1,716 M2 along with the N of 9 were used to calculate the Triangular Grid Node Length (L) of14.8 meters and the Height of the Equilateral Triangle h of 12.9 meters. A random start pointwas generated using the random number feature of Excel and documented on Soil Survey UnitWorksheet No. 2 (Attachment B).
A layout of the soil sampling locations is provided on Figure A-8 contained in Attachment A.The soil core sample locations were demarcated in the field using a GPS unit. A total of 9 coreholes (sample locations) were installed on the grid prescribed over the survey unit (Core Nos.through 9). Core Segments of BCM (typically 3 feet in length) were scanned in the field in 1-foot increments. The 1-foot increments were also characterized by a 1 minute static count ofgross, gamma activity. The results are presented below in Table 2.
_ Median: 31 32,234 6,614'NtStatic Count values (cpm) are equal to the Gross Static Count minus a background value of 25,620
cpm based on the average of 5 consecutive 1-minute counts performed with the detector on top of thetable used to scan the cores, prior to scan activities.
A composite sample representing each core segment was then prepared by combining each set ofthree 1-foot increments in a bucket and breaking up the cores. The final segment of core may beless than or greater than 3 feet depending on the point at which virgin material was encountered.A saaiple (usually between 500 and 800 grams) was taken from each composite and forwardedto Outreach for analysis of Th-232 activity concentration. Analytical results are provided belowin Table 3. Analytical data reports are contained in Attachment C.
I A 36 K-833 1 17.0 0.535 0.512l B 36 K-834 4 17.8 0.489 0.622I C 36 K-835 7 25.0 0.550 0.565I D 36 K-836 10 26.4 0.677 1.26I E 36 K-837 13 22.6 0.478 0.555l F 36 K-838 16 19.2 0.484 0.7932 A 36 K-828 1 17.0 0.424 0.707:2 B 36 K-829 4 15.4 0.380 0.663:2 C 36 K-830 7 14.7 0.376 0.4722 D 36 K-831 10 21.3 0.568 0.7282 E 36 K-832 13 18.2 0.382 0.5593 A 36 K-839 1 17.8 0.387 0.5293 B 36 K-840 4 20.5 0.555 0.7533 C 36 K-841 7 29.1 0.504 0.6183 D 36 K-842 10 29.7 0.680 0.9043 E 36 K-843 13 22.5 0.828 0.8013 F 36 K-844 16 21.5 0.524 0.5304 A 36 K-856 1 15.6 0.348 0.6054 B 36 K-857 4 18.4 0.738 0.9304 C 36 K-858 7 23.5 0.541 0.8714 D 36 K-859 10 17.0 0.643 0.8354 E 36 K-860 13 21.3 0.495 0.5244 F 48 K-861 16 19.4 0.746 0.8865 A 36 K-851 1 19.0 0.476 0.8905 B 36 K-852 4 21.8 0.523 0.9925 C 36 K-853 7 22.5 0.901 0.8395 D 36 K-854 10 27.1 0.577 0.5655 E 36 K-855 13 19.6 0.774 0.8926 A 36 K-845 1 2.23 0.131 0.3937 A 36 K-848 1 25.5 1.11 1.317 B 36 K-849 4 21.0 0.908 0.8357 C 36 K-850 7 20.8 0.785 0.8368 A 48 K-847 1 12.9 0.279 0.4639 A 48 K-846 1 24.1 0.907 0.847= Count: 34_ ._ Average 20.2_ . . Sid. Dev.: 5.11-
Minimum: 2.23Maximum: 29.7
_ Median: 20.7 1
Q.?4O009A4072ZFSS RqprWts\Vole Hl~vyU.it FM 005'iSSBn 00 .da 6 Revision 03/22/06
The gross and net Th-232 activity concentrations for all 34 systematic composite samples werebelow the BCM surrogate value of 31.1 pCi/g net Th-232 activity concentration (DCCL). Themaximum gross Th-232 activity concentration was 29.7 pCi/g. The average gross Th-232activity concentration was 20.2 pCi/g. The standard deviation of the 34 composite samples was5.11, which fell above the estimated standard deviation of 4.4 used to calculate the minimumnumber of samples required in the decommissioning plan.
Since the estimated variance (standard deviation) is greater than the variance used to calculatethe minimum number of samples required (N), N was recalculated using the measured varianceof 5.11 to ensure enough samples were taken, as follows:
Paramount to determining the minimum number of samples is the determination of the relativeshift, delta over sigma (A./a). Delta is equal to the DCGL minus the lower-bound gray region(LBGR) value. The LBGR value is arbitrarily set at one-half the DCGL value to start thedetermination. Sigma is an estimate of the variability in a set of sample analysis results from asurvey unit. In the DP, the estimate of sigma used was based on the standard deviations inTh-2'32 activity measured in survey units during the FSS sampling of the adjacent landremediation final survey. The net Th-232 activity concentration of 31.1 pCi/g was used as theDCCL and A was equal to 31.1 - 15.55, or 15.55. Delta divided by the sigma of 4.4 resulted in arelative shift of 3.53 which is rounded to 3.5 for the purpose of determining the required numberof samples. The number of samples was then looked up in Table 5.3 of MARSSIM (9 forselected alpha and beta error rates of 0.05).
Using the original net DCCL value of 3 1.1 pCi/g, a recalculation of N results in a delta of (31.1 -15.55) of 15.55 and a relative shift of (15.55 / 5.11) of 3.04. The resulting N for a standard Class1 survey unit of 2,000 m2 is 9 (MARSSIM Table 5.3). Nine systematic core samples were takenresulting, in 34 1-meter composite samples.
2.3 'Wilcoxon Rank Sum (WRS) Testing
The analytical results for the systematic soil core composite samples were evaluated using theprocedure contained in Appendix C, Volume I of this Final Status Survey Report (WilcoxonRank Sum Test). The evaluation showed that the survey unit core sample results meet the DPstatistical criterion based on the first statistical test as described below.
If the difference (29.1 pCi/g) between the maximum survey unit soil sample activityconcentration (29.7 pCi/g) and the minimum reference background area soil sample activityconcentration (0.60 pCi/g) is less than DCCL (31.1 pCi/g), then the survey unit meets the releasecriterion. Table 4 presents a summary of the data used to complete the statistical evaluation ofthe survey unit.
Q.T4001A4072PSS Requ\olSme IWSuyey Uit ISSB 005\ss 00s tetoc7 Revision 03/22/06
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Table4 -Reference Group and Survey Unit Sample ResultsReference Th-232 Survey Unit Th-232
Survey Unit Kaiser-FSSB-005 which consists of a unit of BCM placed in an excavation resultingfrom. the removal of radiologically-affected soil from the Retention Pond area, is considered aClass 1 survey unit with an approximate base surface area of 1,716 in2. It is located on the eastside of the pond parcel within the excavation bottom associated with Survey Unit Kaiser-FSS-016 (Figure 3). The survey unit is bordered by excavation backfill Survey Unit Kaiser-FSSB-006 to the north, a wall of non-impacted soil (clean import borrow material) to the south and east(partially - along the Specific Systems Property) and south, excavation backfill Survey UnitKaiser-FSSB-003 to the east (partially), and excavation backfill Survey Units Kaiser-FSSB-007and Kaiser-FSSB-008 to the west.
A total of seven 2-foot layers (lifts) of BCM was placed in Survey Unit Kaiser-FSSB-005.
The acceptance criterion for BCM survey units at the Tulsa facility is the DCCL of 31.1 pCi/gnet Th-232 activity concentration. The final status survey consisted of a gross gamma scan ofeach placed 2-foot lift of BCM and systematic soil core sampling upon completion of the BCMunit. The results of the final status survey activities were as follows:
The 100 percent coverage gamma scan of each lift (final as-left condition) did notindicate the presence of small areas (1 m2) of elevated activity (greater than the DCCLfor the site).
i* All 34 systematic composite sample results (gross and net) were below the BCMsurrogate value of 31.1 pCi/g net Th-232 activity concentration (DCCL).Ts She analytical results meet the DP statistical criterion based on the first statisticalevaluation of the data (WRS Test procedure).
The results of the final status survey activities show that Survey Unit Kaiser-FSSB-005 meets theDP acceptance criteria.
I Soil Survey Unit Worksheet No. 2Random Number Generator for Start Point
Final Status SurveyThorium Remediation Project
Tulsa, Oklahoma FacilityKaiser Aluminum & Chemical Corporation
SURVEY UNIT: KAISER-FSSB-005
RANDOM START POINTxaxs( Meters) y axis (Meters)
1 52 lower boundupper bound
0
(0, 0)North
x axis
QAP4000\PA40T2fSS Reports\olurne fI\ISurvey Unit FSSB OO5Attachmnent B - Soil Survey Unit Worksheets\Soil Survey Unit Worksheet No. 2
ATTACIMENT C
LABORATORY ANALYTICAL RESULTS
Outreach.Laborator(
North Aspen,ken Anovw. OK 74)12
j918) 251-2515FAX (918) 251-0008
August 22, 2005
David WeyantKaiser Aluminum & Chemical7311 E.41st StreetTulsa, OK 74145
Project: Kaiser Thorium Remediation PA40004072OUTREACH LAB ID: 20050586
Dear Mr. Weyant:
Please find enclosed a revised page 7 of your report 20050586. In the original report,the sample ID was inadvertently omitted from sample #28. Since we have onlycorrected one ID and no results have changed, we have provided only that page to insertin your report.
We apologize for the inconvenience.
Thank you for choosing Outreach Laboratory and if you have any questions, please callus at 918-251-2515.
David WeyantKaiser Aluminum & Chemical7311 E.41st StreetTulsa, OK 74145
~;4; ~I-l
Project: Kaiser Thorium Remediation PA-4000-4072OUTREACH LAB ID: 20050586
Dear Mr. Weyant:
Please find enclosed the analytical report for your samples received in our laboratory onJuly 27, 2005. Thirty-four soil samples were received in good condition and analyzedfor Thorium-232 by Gamma Spectroscopy without drying. and grinding and PercentMoisture with an expedited 5 work-day turn. Results were faxed early on 8/2/05.
All Quality Control for the requested analyses is reported on the analytical report. Thelaboratory control standard and duplicates for all analyses were within method controllimits.
Your samples will be returned as requested.
Thank you for choosing Outreach Laboratory and if you have any questions, please callus at 918-251-2515.
I q..N I_ \1(LS-- I -,),I If It i.? I J[ V - t\ -- I I I -. h� I I L� I . --- - . . . - Li ". - - - - - -- - - - - -14I .1 - I I - I - - I
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RECEIVEDRCEV / 31i"
RELINQUISHED BY: DATE TIME RECEIVED BY: DATE TIME -_'My signature on this chain of custody form IndIcates that I am authorized by the above company to release sample* for analysis. The company agrees to pay the ent balance upon receiptof sample data and it is understood and agreed that any balance carried over thirty (30) days Is subject to a 1.5% per month (18% per annum) late charge. In the event of defaulth te company
becomes legally liable for any reasonable attorney and/or collectIon fees and at related costs neessary to remIt the entire balance to Outreach Technologies, Inc. (Outreach Laboatory).
I l
TAUPIt r RETLIRNa~t)POSAL An non-hazardous samolee shall be disposed of 30 days after Issue of final report. An others will be returned at clents expense.
rC-''''_JUTREACHLABORATORY
311 North AspenBroken Arrow, OK 74012Phone: (918) 251-2515Fax: (918) 251-0008
CHAIN (h -USTODYResultsTo: Company l#(A\ \7 -A"r -i p % 1
t\I& $i_ Name ('NtN a.% _______
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RELINQUISHED BY: DATE . .1ME_ _ RECEIVED BY. DATF TIME_-
tAy signature on thliS chain of custody form IndIcates that I am authorized by the above company to release ample for ann ysb:The company agr to py th ntir bal upon reIotof sample data and it Is understood and agreed that any balance carred over thirty (30) days I stuitect to a 1.S% per month (i 8% per annum) late charge. In the event oi default, th Company
becomes legally tiable for any reasonable attorney and/or cotection fees and aS related coals necessary to remit the entire balance to Outreach Technologies. Inc. (Outreach Laboratory).
e -Alt .'- e ne [n- . An h .- 4-.. - n h.M s- Pised of 30 days after Issue of fInal report At others wilt be returned at cllenrs expense.
4#. JUTREACHLABORATORY
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Broken Arrow, OK 74012r hone: (918) 251-2515Fax: (918) 251-0008
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RELINQUISHED B Y : DATE TIME RECEIVED BY: -DATETIME
Ity Ignature on this chain of custody form Indicates that I am authorized by the above company to release Samrpl for analysis. Tho company agrea to pay the entire balance upon receipt Iof sample data and It Is understood and agreed that any balance carrled over thirty (30) days I sub ect to a 1.5% per month (18% per annum) late charge. In th ent of deft hew company
becomes legally nlable for any reasonable attorney and/or coltection fees and alt related costs necessary to remit the entire balance to Outreach Technologies, Inc. (Outreach Laboratory).
_ . . ___ ___ _ - - - .h n - .- -. - N. ~ f 1A aa aft, ian- ntf final rawrt An others vA'be returned at clienra expense.
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Soil Survey Unit Worksheet No. ISoil Survey Unit Worksheet No. 2
Laboratory Analytical Results
Q:\P400D\PA4072\FSS Rcports\Volurne DT\Survey Unit FSSB 006\FSSB 006 TOC.doc
Final Status Survey ReportVolume III - Pond Parcel Excavation Backfill Units
Sub-Report No. BCM-006Survey Unit Kaiser-FSSB-006Thorium Remediation Project
Tulsa, Oklahoma FacilityKaiser Aluminum & Chemical Corporation
March 22, 2006
1.0 BACKGROUND
This sub-report documents the results of pond parcel excavation backfill unit final status surveyactivities completed as part of the Thorium Remediation Project at the Tulsa, Oklahoma facility(Figure 1). Specifically, this technical report addresses the final status survey of Survey UnitKaiser-FSSB-006, which consists of a unit of Below Criteria Material or BCM (less than 31.1net pCi/g Th-232 material) placed in an excavation resulting from the removal of radiologically-affected soil from the former Reserve Pond area. Survey Unit Kaiser-FSSB-006 is considered aClas3 1 survey unit with an approximate base surface area of 2,177 m2. It is located on the northside of the pond parcel within the excavation bottom associated with Survey Unit Kaiser-FSS-017 (Figure 3). The survey unit is bordered by a wall of non-impacted soil (clean import borrowmaterial) to the north (along Fulton Creek), excavation backfill Survey Units Kaiser-FSSB-009and Kaiser-FSSB-010 to the west, excavation backfill Survey Units Kaiser-FSSB-003 andKaiser-FSSB-004 to the east, and excavation backfill Survey Units Kaiser-FSSB-003, Kaiser-FSS]3-005, and Kaiser-FSSB-007 to the south.
A total of six 2-foot layers (lifts) of BCM was placed in Survey Unit Kaiser-FSSB-006.
Separate distinct final status surveys were completed for the pond parcel excavation bottomsurvey units prior to backfilling with BCM. The final status survey of the pond parcelexcavation bottom survey units is documented in Volume I of the Final Status Survey Report.
Q \P40407MS Rqpot -hwe IwI Unt nSB 1 Revision 03/22/06
2.0 SURVEY ACTIVITIES AND RESULTS
This section of the sub-report presents the final status survey data for the BCM placed withinSurvey Unit Kaiser-FSSB-006. The final status survey consisted of a gross gamma scan of eachplaced 2-foot lift of BCM and systematic soil core sampling upon completion of the BCM unit.
2.1 Gross Gamma Scan
Each 2-foot lift of BCM was surveyed through a 100 percent coverage gamma scan to confirmacceptable radiological conditions and identify any elevated areas. During the scanning of eachlift, the detector was held close to the BCM surface (1 to 2 inches) and moved in a serpentinepattern. Approximate equal-distant background measurements were also obtained at 1-meterabove the ground surface for each lift of BCM placed. A statistical summary of the backgroundsurvey and 100 percent coverage gamma scan of each BCM lift placed in the survey unit isprovided below in Table 1.
Contour maps of the gross gamma background and final (as-left condition) scanning surveyresults are presented by BCM lift on Figures A-1 through A-6 contained in Attachment A.
Q:?4OW?1A4072\FSS RepoftsVo .me UIIDSwy Unit FSSa OOG'JSS tOD te~tdOc 2 Revision 03/22/06
The 100 percent coverage gross gamma scan of the 2-foot lifts did not indicate the presence ofsmal I areas (1 m2) of elevated activity (above the DCCL for the site).
2.2 Systematic Soil Core Sampling
The final status survey also consisted of systematic soil core sampling based on a random startpoint and an equal-distant triangular grid. The Minimum Number of Core Samples (core holes)Required (N) based on the scan MDC was determined to be 9, as documented on Soil SurveyUnit Worksheet No. 1 (Attachment B). The default Class 1 Survey Unit Area (A) of 2,000 mIalong with the N of 9 were used to calculate the Triangular Grid Node Length (L) of 16.0 metersand the Height of the Equilateral Triangle (h) of 13.9 meters. Since A was greater than 2,000 m2 ,
the number of samples (Ni) was recalculated (10) to correspond to the L of 16.0 meters. Arandom start point was generated using the random number feature of Excel and documented onSoil Survey Unit Worksheet No. 2 (Attachment B).
A layout of the soil sampling locations is provided on Figure A-7 contained in Attachment A.The soil core sample locations were demarcated in the field using a GPS unit. A total of 12 coreholes (sample locations) were installed on the grid prescribed over the survey unit (Cores Nos. 1through 1.2). Core segments of BCM (typically 3 feet in length) were scanned in the field in 1-foot increments. The 1-foot increments were also characterized by a 1 minute static count ofgross gamma activity. The results are presented below in Table 2.
Net Static Count values (cpm) are equal to the Gross Static Count minus a background value of either22,645 cpm (Core Nos. 1, 2, 5, 7, 8, 10, and 11) or 23,315 cpm (Core Nos. 3, 4, 6, 9, and 11), based onthe average of 5 consecutive 1-minute counts performed with each detector on top of the table used toscan the cores, prior to scan activities.
A composite sample representing each core segment was then prepared by combining each set ofthree 1-foot increments in a bucket and breaking up the cores. The final segment of core may beless than or greater than 3 feet depending on the point at which virgin material was encountered.A sample (usually between 500 and 800 grams) was taken from each composite and forwardedto Outreach for analysis of Th-232 activity concentration. Analytical results are provided belowin Table 3. Analytical data reports are contained in Attachment C.
Q ?4000\.?A40FMS R qe s\VolmMIe O M W {t FSS B 006PS B 006 k.Uoc6 Revision 03/22/06
Number Segment (in.) Sample No. (ft) (pCi/g) (pCi/g) (pCi/g)1]2 B 36 K-931 4 28.1 0.765 0.9581.2 C 36 K-932 7 26.2 0.975 0.8101]2 D 48 K-933 10 22.4 0.634 0.826
= Count: 44
= Average: 23.1Sid. Dev.: 4.38
. _ . Minimum: 11.6Maximum: 31.5
_ Median: 23.5
The gross and net Th-232 activity concentrations for 43 of the 44 systematic composite sampleswere below the BCM surrogate value of 31.1 pCi/g net Th-232 activity concentration (DCCL).The gross Th-232 activity concentration for Sample K-918 (Core No. 9, Segment A - 31.5pCi/g) slightly exceeded the DCCL value. However, the net Th-232 activity concentration forthe sample (30.4 pCi/g) was below the DCCL value. The average gross Th-232 activityconcentration was 23.1 pCi/g. The standard deviation of the 44 composite samples was 4.38,which fell below the estimated standard deviation of 4.4 used to calculate the minimum numberof samples required in the decommissioning plan.
2.3 Wilcoxon Rank Sum (WRS) Testing
The analytical results for the systematic soil core composite samples were evaluated using theprocedure contained in Appendix C, Volume I of this Final Status Survey Report (WilcoxonRank. Sum Test). The evaluation showed that the survey unit core sample results meet the DPstatistical criterion based on the first statistical test as described below.
If the difference (30.92 pCi/g) between the maximum survey unit soil sample activityconcentration (31.5 pCi/g) and the minimum reference background area soil sample activityconcentration (0.58 pCi/g) is less than DCCL (31.1 pCi/g), then the survey unit meets the releasecriterion. Table 4 presents a summary of the data used to complete the statistical evaluation ofthe survey unit.
Table 4 - Reference Group and Survey Unit Sample Results
Reference Th-232 Survey Unit Th-232Group Sample ID pCi/ g )Group Sample ID (pCi/g)
Sunrey Unit Kaiser-FSSB-006 which consists of a unit of BCM placed in an excavation resultingfrom the removal of radiologically-affected soil from the Retention Pond area, is considered aClass 1 survey unit with an approximate base surface area of 2,177 m2. It is located on the northside of the pond parcel within the excavation bottom associated with Survey Unit Kaiser-FSS-017 (Figure 3). The survey unit is bordered by a wall of non-impacted soil (clean import borrowmaterial) to the north (along Fulton Creek), excavation backfill Survey Units Kaiser-FSSB-009and Kaiser-FSSB-010 to the west, excavation backfill Survey Units Kaiser-FSSB-003 andKaiser-FSSB-004 to the east, and excavation backfill Survey Units Kaiser-FSSB-003, Kaiser-FSSB-005, and Kaiser-FSSB-007 to the south.
A total of six 2-foot layers (lifts) of BCM was placed in Survey Unit Kaiser-FSSB-006.
The acceptance criterion for BCM survey units at the Tulsa facility is the DCCL of 31.1 pCi/gnet Th-232 activity concentration. The final status survey consisted of a gross gamma scan ofeach placed 2-foot lift of BCM and systematic soil core sampling upon completion of the BCMunit. The results of the final status survey activities were as follows:
. The 100 percent coverage gamma scan of each lift (final as-left condition) did notindicate the presence of small areas (1 m2) of elevated activity (greater than the DCCLfor the site).
O The gross and net Th-232 activity concentrations for 43 of the 44 systematic compositesamples were below the BCM surrogate value of 31.1 pCi/g net Th-232 activityconcentration (DCCL). The gross Th-232 activity concentration for Sample K-918 (CoreNo. 9, Segment A - 31.5 pCi/g) slightly exceeded the DCCL value. However, the netTh-232 activity concentration for the sample (30.4 pCi/g) was below the DCCL value.The analytical results meet the DP statistical criterion based on the first statisticalevaluation of the data (WRS Test procedure).
The results of the final status survey activities show that Survey Unit Kaiser-FSSB-006 meets theDP acceptance criteria.
2. Description: Pond Parcel Excavation Backfill Unit
3. Net Th-232 Acceptance Criteria (pCi/g): 31.1
4. Dimensions (m): Approximately 60 meters x 36 meters; Area, A (n2): 2,177
5. Estimnate of Gross Gamma Scan Background Readings (cpm)
Average: 80.000 Minimum: 50.000 Maximum: 100.000
6. Based on the maximum background gross gamma scan reading, the scan MDC (Minimum Detectable
Concentration of Th-232), the corresponding N (Minimum Number of Required Samples) and L (Triangular
Grid Node Length) for a standard 2,000 m2 Class 1 survey unit are:
* Gross Gamma Scan MDC (pCi/g): 5.7
* Minimum Number of Samples (N): 9 Triangular Grid Node Length (L): 16.0 m
7. If the area of the Survey Unit is less than 2,000 m2, recalculate the corresponding Triangular Grid Node
Length (LI) for the Survey Unit Area (A), using the following formula: LI = (A/(0.866 x 9))'2: N/A
8. If N is greater than 9 and the A is other than 2,000 n 2, recalculate the corresponding Triangular Grid Node
Length (LI) using the following formula LI = (A/(0.866 x N))'12: N/A
9. If A is greater than 2,000 in2 and N is equal to 9, recalculate the minimum number of samples (N1)
corresponding to a Triangular Grid Node Length (L) of 16 in using the following formula N1 = A / (0.866 x
115 ), Ml: 10
11). Calculate the height (h) of the equilateral triangle with side length equal to L (or (LI) using the following
formula: h = ((L2 - (L/2)2) 2: 13.9 m.
Q:'14000\E A4072\FSS Repoons\Volunne IlDSurvey Unit FSSB 006\Attaclutent B -Soil Survey Unit Worksheets\Soil Survey Unit Worksheet No. I.doc
I Soil Survey Unit Worksheet No. 2Random Number Generator for Start Point
Final Status SurveyThorium Remediation Project
Tulsa, Oklahoma FacilityKaiser Aluminum & Chemical Corporation
SURVEY UNIT: KAISER-FSSB-006
RANDOM START POINT
Ix axis ( Meters) y axis ( Meters)
16 I 4 I lower boundupper bound
to
( 0,0)
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Q:WP40OOOPA4072FSS ReportslVolurne IfISurvey Unit FSSB 006lAttachrnent B - Soil Survey Unit WorksheetsSoil Survey Unit Worksheet No. 2
ATTACHMENT C
LABORATORY ANALYTICAL RESULTS
Outreach')oratory
,v OKC 740;:2(918) Z51-Z515rAX (918) 251-0008
- AEL
August 19, 2005
David WeyantKaiser Aluminum & Chemical7311 E. 41st StreetTulsa, OK 74145
Y_ IFY'>1/ d 6
Project: Kaiser Thorium Remediation PA40004072OUTREACH LAB ID: 20050646
Dear Mr. Weyant:
Please find enclosed the analytical report for your samples received in our laboratory onAugust 15, 2005 for the above captioned project. Forty-four soil samples were receivedin good condition and analyzed by Gamma Spectroscopy without drying and grindingand Percent Moisture with a expedited 5 work day turn. Results were faxed on 8/19/05.
All Quality Control- for the requested analyses is reported on the analytical report. Thelaboratory control standard and duplicates for all analyses were within method controllimits.
Your samples will be returned as requested.
Thanik you for choosing Outreach Laboratory and if you have any questions, please callus at 918-251-2515.
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-- t ^'4'." tIN I 'nd aS relted cost necesurY t6 emit the entdr balance to Outreach~echtoioiolea. Inc. (Outrsah Laortory).,
.OUTREACH4 LABORATORY
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*Phone: (918) 251-2515Fax: (918) 251-0008
Result To:. CHAIsn 0 C ST D . . .r. .P UT. -:
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My signature on this chatin of custody lorm edes that I amuthiorized by the above company to release eample. for analyasis The company agrees to pay the entinr balance upon reelpt
of sample data and it lh undetst6od and. ag t that any balaneeecarried ove;l ty (30) datys is subfect toe a iS% per month (18% per annum) late charge. In the *vent ;o deault the company
becomes legally liable tofrny reasonable attciney aqd/or coectilbn fees and an related costa necessary to remit the entire balance to Outreach Thrinolloges, Inc. (Outreach Ltaboratory).
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SAMPLE. L-,'IN
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Date Received: 8/15/05 10:25:40
Sample ClientNzymber Sample ID
Lab Number:
DateMatrix. Sampled
Soil 03/12/09
20050646
ContainerType
Plastic
ContainerSize
Due: 8119/05
Custody SealSeal IntactPreservation
20050646-01 A K-897Percent Moisture (LOD)
Th-232 by Gamma Spec
Yes Yes16 oz None Yes Yes
20050646-02 A K-898Percent Moisture (LOD)
Th-232 by Gamma Spec
Soil
20050646-03 A K-899Percent Moisture (LOD)Th-232 by Gamma Spec
Soil
08/12/05 Plastic
08/12/05 Plastic
08/12/05 Plastic20050646-04 A K-900Percent Moisture (LOD)
Th-232 by Gamma Spec
Soil
16oz
16 oz
16 oz
l60z.
16 oz
None Yes
None Yes
None Yes
Yes
Yes
Yes
Yes
Yes
20050646-05 A K-901Percent Moisture (LOD)
Th-232 by'Gammna Spec
Soil 08/12/05 Plastic None Yes
20050646-06.A K-902Percent Moisture (LOD)
Th-232 by Gamma Spec
Soil 08/12/05 Plastic None Yes
20050646-07 A K-903Percent Moisture (LOD)
Th-232 by Gamma Spec
Soil
20050646-08 A K-904* Percent Moisture (LOD)
Th-232 by Gamma Spec
Soil
08/12/05 Plastic
08/12/05 Plastic
08/12/05 Plastic
08/12105 Plastic
16 oz
60oz
16 oz
None
None
Yes
Yes
Yes
Yes
Yes
Yes
Yes
20050646-09 A K-905Percent Moisture (LOD)
TE-232 by Gamma Spec
Soil None
Soil20050646-10 A.- K-906 : ' .16oz None Yes- A
Percents re (LOD)Th-232 by Gamma Spec
20050646-11 A .K-907Percent Moisture (LOD)Th-232 bv Gamma Spec
20050646-12 A v- MOPercent Moisture (LOD)
Th.232 by Gamma Spec
Soil
Soil
Soil
Soil
08/12/05 Plastic
08/12/05 Plastic
16 oz
16 oz
16 oz
16 oz
None Yes
None Yes
Yes
Yes
Yes
Yes
20050646-13 A K-909Percent Moisture (LOD)
Th-232 by Gamma Spec
20050646-14 A K-910Percent Moisture (LOD)Th-232 by Gamma Spec
08/12/05 Plastic . None Yes
08/12/05 Plastic None Yes
20050646-15 A K-911Percent Moisture (LOD)
Th-232 by Gamma Spec
20050646-16 A K-912Percent Moisture (LOD)
Th-232 by Gamma Spec
20050646-17 A K-913Percent Moisture (LOD)
Th-232 by Gamma Spec
20050646-18 A K-914Percent Moisture (LOD)
Th-232 by Gamma Spec
Soil
Soil
Soil
Soil
08/12/05 Plastic
08/12/05
08/12/05
Plastic
Plastic
16 oz
16oz
16oz
16 oz
None .
None
Yes
Yes
Yes
Yes
Yes
Yes
None Yes -
08/12/05 Plastic None Yes
20050646-19 A K-915Percent Moisture (LOD)Th-232 by Gamma Spec
20050646-20 A K-916Percent Moisture (LOD)Th-232 by Gamma Spec
Soil
Soil
08/12/05 Plastic
08/12/05 Plastic
16oz
16 oz
None Yes Yes
YesNone Yes
20050646-2- - K-917Percent Moisture (LOD)Th-232 by Gamma Spec
08/12/05 isticSoil 16 0z I0rNone
20050646-22 A K-918 Soil
* Th-232 by Gamma Spec
08/12/05 Plastic 16oz None Yes Yes
20050646-23 A K-919Percent Moisture (LOD)Th-232 by Gamma Spec
Soil
20050646-24 A K-920Percent Moisture (LOD)Th-232 by Gamma Spec.
Soil
20050646-25 A K-921Percent Moisture (LOD)Th-232 by Gamma Spec
Soil
20050646-26 A K-922Percent Moisture (LOD)Th-232 by Gamma Spec
Soil
08/12105 Plastic
08/12105 Plastic
08/12/05 Plastic
08/12/05 Plastic
08/12/05 Plastic
08/12/05 Plastic
08/f2/OS Plastic
16oz
16oz
16oz
16 oz
16 oz
16oz
16 oz
60oz
None Yes
None Yes
None Yes
None Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
20050646-27 A K-923Percent Moisture (LOD)Th-232 by Gamma Spec
Soil None Yes
20050646-28 A K-924Percent Moisture (LOD)Th-232 by Gamma Spec
20050646-29 A K-925Percent Moisture (LOD)Th-232 by Gamma Spec
Soil
Soil
Soil
None Yes
None Yes
20050646-30 A K-926Percent Moisture (LOD)Th-232 by Gamma Spec
08/12/05
08/12/05
Plastic None Yes
20050646-31 A K-927 Soil Plastic 16 oz None Yes Yes
Percent '- :re (LOD)
Th-232 by Gamma Spec
20050646-32 A K-928Percent Moisture (LOD)
Th-232 bv Gamma Spec
Soil 08/12/05 Plastic 16 Cz None Yes Yes
2005eo0646-3J A Y-929
Percent Moisture (LOD)
Th-232 by Gamma Spec
S Al
20050646-34 A K-930Percent Moisture (LOD)
Tb-232 by Gamma Spec
Soil
20050646-35 A K-931Percent Moisture (LOD)
Th-232 by Gamma Spec
Soil
20050646-36 A K-932
Percent Moisture (LOD)
Th-232 by Gamma Spec
Soil
08/12/Q5 Dl-ets'
08/12/05 Plastic
08/12/05 Plastic
08/12/05 Plastic
08/12/05 Plastic
08/12/05 Plastic
08/12/05 Plastic
16CZ
20050646-37 A K-933
Percent Moisture (LOD)
Th-232 by Gamma Spec
Soil
16oz
16oz
16oz
16 oz
16 oz
16 6z
16 oz
16oz
None Yes
None Yes
Yes
None
None Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
20050646-38 A K-934
. Percent Moisture (LOD)
Th-232 by Gamma Spec
Soil None Yes
20050646-39 A K-935Percent Moisture (LOD)
ltb-232 by Gamma Spec
Soil None Yes
20050646-40 A K-936Percent Moisture (LOD)
Th-232 by Gamma Spec
Soil 08/12/05
08/12105
Plastic
Plastic
None Yes
20050646-41 A K-937Percent Moisture <LOD)
Th-232 by Gamma Spec
Soil None Yes
l-
20050646e K-938Percefit,..,isture (LOD)
Th-232 by Gamma Spec
20050646-43 A K-939Percent Moisture (LOD)
Th-232 by Gamma Spec
(7.08/12105 V 'lasticSoil
Soil
Soil
08/12/05 Plastic
16 oz
l6oz
16 oz
None Yes
None Yes Yes
20050646-44 A K-940Percent Moisture (LOD)
Th-232 by Gamma Spec.
08/12/05 Plastic None Yes Yes
CONTAINER INSPECTION
# Coolers Custody Seals Broken - Y/ I Temperature . Blue Ice I Wet Ice Radiation Surve3
SAMPLE INSPECTION
Custody Seals Broken . Chain of Custody Record3/N Labels in Tact b3l Radiation Survey Complete /N
Soil Survey Unit Worksheet No. 1Soil Survey Unit Worksheet No. 2
Laboratory Analytical Results
Q:\P4001)\PA4072\FSS Reports\Volume TI\Survcy Unit FSSB 007\FSSB 007 TOC.doc
Final Status Survey ReportVolume III - Pond Parcel Excavation Backfill Units
Sub-Report No. BCM-007Survey Unit Kaiser-FSSB-007Thorium Remediation Project
Tulsa, Oklahoma FacilityKaiser Aluminum & Chemical Corporation
March 22, 2006
1.0 BACKGROUND
This sub-report documents the results of pond parcel excavation backfill unit final status surveyactivities completed as part of the Thorium Remediation Project at the Tulsa, Oklahoma facility(Figure 1). Specifically, this technical report addresses the final status survey of Survey UnitKaise:r-FSSB-007, which consists of a unit of Below Criteria Material or BCM (less than 31.1net pCi/g Th-232 material) placed in an excavation resulting from the removal of radiologically-affected soil from the Retention Pond area. Survey Unit Kaiser-FSSB-007 is considered a Class1 survey unit with an approximate base surface area of 1,381 m2. It is located on the east side ofthe pond parcel within the excavation bottom associated with Survey Unit Kaiser-FSS-018(Figure 3). The survey unit is bordered by excavation backfill Survey Units Kaiser-FSSB-006and Kaiser-FSSB-010 to the north, excavation backfill Survey Unit Kaiser-FSSB-008 to thesouth, excavation backfill Survey Unit Kaiser-FSSB-005 to the east, and excavation backfillSurvey Units Kaiser-FSSB-010 and Kaiser-FSSB-012 to the west.
A total of eight 2-foot layers (lifts) of BCM material was placed in Survey Unit Kaiser-FSSB-007. It should be noted that BCM was placed in excavation backfill Survey Units Kaiser-FSSB-007 and Kaiser-FSSB-008 simultaneously.
Separate distinct final status surveys were completed for the pond parcel excavation bottomsurvey units prior to backfilling with BCM. The final status survey of the pond parcelexcavation bottom survey units is documented in Volume I of the Final Status Survey Report.
This section of the sub-report presents the final status survey data for the BCM placed withinSurvey Unit Kaiser-FSSB-007. The final status survey consisted of a gross gamma scan of eachplaced 2-foot lift of BCM and systematic soil core sampling upon completion of the BCM unit.
2.1 Gross Gamma Scan
Each 2-foot lift of BCM was surveyed through a 100 percent coverage gamma scan to confirmacceptable radiological conditions and identify any elevated areas. During the scanning of eachlift, the detector was held close to the BCM surface (I to 2 inches) and moved in a serpentinepattern. Approximate equal-distant background measurements were also obtained at 1-meterabove the ground surface for each lift of BCM placed. A statistical summary of the backgroundsurvey and 100 percent coverage gamma scan of each BCM lift placed in the survey unit isprovided below in Table 1.
Table 1 - Gross Gamma Scan Results Summary (cpm)
Lift No. of ScanArea 2-sec. Rate Ave. Stdev. Min. Max. Median
Contour maps of the gross gamma background and final (as-left condition) scanning surveyresults are presented by BCM lift on Figures A-1 through A-8 contained in Attachment A.The )L00 percent coverage gross gamma scan of the 2-foot lifts did not indicate the presence ofsmall areas (1 m2) of elevated activity (above the DCCL for the site).
2.2 Systematic Soil Core Sampling
The final status survey also consisted of systematic soil core sampling based on a random startpoint and an equal-distant triangular grid. The Minimum Number of Core Samples (core holes)Required (N) based on the scan MDC was determined to be 9, as documented on Soil SurveyUnit Worksheet No. 1 (Attachment B). Once N was determined, the Survey Unit Area (A) of1,381 m2 along with the N of 9 were used to calculate the Triangular Grid Node Length (L) of13.3 meters and the Height of the Equilateral Triangle (h) of 11.5 meters. A random start pointwas generated using the random number feature of Excel and documented on Soil Survey UnitWorksheet No. 2 (Attachment B).
A layout of the soil sampling locations is provided on Figure A-9 contained in Attachment A.The soil core sample locations were demarcated in the field using a GPS unit. A total of 9 coreholes (sample locations) were installed on the grid prescribed over the survey unit (Core Nos. Ithrough 9). The core holes were of various depths depending on the location within the surveyunit. Core segments of BCM (typically 3 feet in length) were scanned in the field in 1-footincrements and were also characterized by a 1 minute static count of gross gamma activity. Theresults are presented below in Table 2.
_Median: 30 31,971 7,153'Net Static Count values (cpm) are equal to the Gross Static Count minus a background value of 24,818cpm, the average of 5 consecutive 1-minute counts performed with the detector on top of the table used toscan the cores, prior to scan activities.
A composite sample representing each core segmentwas then prepared by combining each set ofthree 1-foot increments in a bucket and breaking up the cores. The final segment of core may beless than or greater than 3 feet depending on the point at which virgin material was encountered.A sample (usually between 500 and 800 grams) was taken from each composite and forwardedto Outreach for analysis of Th-232 activity concentration. Analytical results are provided belowin Table 3. Analytical data reports are contained in Attachment C.
6 A 36 K-1089 1 21.3 1.21 1.026 B 36 K-1090 4 17.9 1.54 1.116 C 36 K-1091 7 20.1 1.26 0.7006 D 36 K-1092 10 25.0 1.80 0.7406 E 36 K-1093 13 23.6 2.09 0.8257A 36 K-1094 1 24.3 1.31 0.7527 B 36 K-1095 4 21.5 1.33 0.6437C 36 K-1096 7 27.9 1.61 0.7767 D 36 K-1097 10 24.9 2.36 0.959E 36 K-1098 13 23.9 1.41 0.7118 A 36 K-1099 1 20.4 0.964 0.5928 B 36 K- 100 4 18.7 0.982 0.7438 C 36 K-1101 7 24.1 2.27 0.9148 D 36 K-1102 10 25.5 1.46 0.6538 E 36 K-1103 13 18.2 0.851 0.6859 A 36 K-1104 1 18.7 0.778 0.7319 B 36 K-1105 4 16.6 1.40 0.9089 C 36 K-1106 7 26.2 1.38 0.6549 D 36 K-1107 10 28.1 1.32 1.209 E 36 K-1 108 13 22.7 1.14 0.537
= Count: 44= Average: 23.0
Std. Dev.: 3.75_ Minimum: 14.8
Maximum: 32.8_ Median: 23.6
The gross and net Th-232 activity concentrations for 43 of the 44 systematic composite sampleswere below the BCM surrogate value of 31.1 pCi/g net Th-232 activity concentration (DCCL).The gross and net Th-232 activity concentrations for Sample K-1082 (Soil Core No. 4, SegmentD - 32.8 pCi/g gross/31.7 pCi/g net) slightly exceeded the net DCCL value. The followingfactors were considered in the evaluation of the sample result:
* The onsite cave count result (25.4 pCi/g) for Sample K-1082 was considerably lower thanthe laboratory result (32.8 pCi/g).
QAP4OWC W072'FS1 Rep.l\Votme M\Stvey Vit FSSB 007SSB 007 Tadx R Revision 03/22/06
e The core scan data for Core No.4, Segment D did not indicate activity significantlygreater than the average of the core segments (see Table 4 below).
* Sample K-1082 represents about a tenth of the total volume of the Core No. 4, SegmentD composite.
To further evaluate the activity concentration of the core sample, the remaining core compositewas mixed again and nine additional samples were prepared and forwarded to Outreach foranalysis. The results of the original and additional samples of Core No. 4, Segment D arepresented below in Table 5.
Including the original analysis result of Sample K-1082, the average Th-232 activityconcentration for Core No. 4, Segment D is 24.7 pCi/g. The average of the 10 samples was usedto represent Core No. 4, Segment D in the statistical analysis of the survey unit. The final soilactivity concentration statistics for Survey Unit Kaiser-FSSB-007 are presented below in Table6:
The standard deviation of the 44 composite samples was 3.45, which fell below the estimatedstandard deviation of 4.4 used to calculate the minimum number of samples required in thedecommissioning plan.
2.3 )Vilcoxon Rank Sum (WRS) Testing
The analytical results for the systematic soil core composite samples were evaluated using theprocedure contained in Appendix C, Volume I of this Final Status Survey Report (WilcoxonRan}; Sum Test). The evaluation showed that the survey unit core sample results meet the DPstatistical criterion based on the first statistical test as described below.
If the difference (27.5 pCi/g) between the maximum survey unit soil sample activityconcentration (28.2 pCilg) and the minimum reference area soil sample activity concentration(0.70 pCi/g) is less than DCCL (31.1 pCi/g), then the survey unit meets the release criterion.Table 7 presents a summary of the data used to complete the statistical evaluation of the surveyunit.
Table 7 - Reference Group and Survey Unit Sample ResultsReference Th-232 Survey Unit Th-232
Survey Unit Kaiser-FSSB-007 which consists of a unit of BCM placed in an excavation resultingfrom the removal of radiologically-affected soil from the Retention Pond area, is considered aClass 1 survey unit with an approximate base surface area of 1,381 m2 . It is located on the eastside of the pond parcel within the excavation bottom associated with Survey Unit Kaiser-FSS-018 (Figure 3). The survey unit is bordered by excavation backfill Survey Units Kaiser-FSSB-006 and Kaiser-FSSB-010 to the north, excavation backfill Survey Unit Kaiser-FSSB-008 to thesouth, excavation backfill Survey Unit Kaiser-FSSB-005 to the east, and excavation backfillSurvey Units Kaiser-FSSB-010 and Kaiser-FSSB-012 to the west.
A total of eight 2-foot layers (lifts) of BCM material was placed in Survey Unit Kaiser-FSSB-007. It should be noted that BCM was placed in excavation backfill Survey Units Kaiser-FSSB-007 and Kaiser-FSSB-008 simultaneously.
The acceptance criterion for BCM survey units at the Tulsa facility is the DCCL of 31.1 pCi/gnet Th-232 activity concentration. The final status survey consisted of a gross gamma scan ofeach -placed 2-foot lift of BCM and systematic soil core sampling upon completion of the BCMunit. The results of the final status survey activities were as follows:
* The 100 percent coverage gamma scan of each lift (final as-left condition) did notindicate the presence of small areas (1 in2) of elevated activity (greater than the DCCLfor the site).
* The gross and net Th-232 activity concentrations for 43 of the 44 systematic compositesamples were below the BCM surrogate value of 31.1 pCi/g net Th-232 activityconcentration (DCCL). The gross and net Th-232 activity concentrations for Sample K-1082 (Soil Core No. 4, Segment D - 32.8 pCi/g gross/31.7 pCi/g net) slightly exceededthe net DCCL value. The average of all of the core composite samples for Core No. 4Segment D (including the original result) was used to represent the segment and the result(24.7 pCi/g) was below the surrogate value of 3 1.1 pCi/g of Th-232.
* The analytical results meet the DP statistical criterion based on the first statisticalevaluation of the data (WRS Test procedure).
The results of the final status survey activities show that Survey Unit Kaiser-FSSB-007 meets theDP acceptance criteria.
Q.V4W .V0Z Rqfl.m MSa it FSSB 007\S B 007Tatdo 12 Revision 03/22/06
2. Description: Pond Parcel Excavation Backfill Unit
3. Net Th-232 Acceptance Criteria (pCi/g): 31.1
4. Dimensions (m): Approximately 30 meters x 46 meters; Area, A (m2): 1.381
5. Estimatc of Gross Gamma Scan Background Readings (cpm)
Average: 80.000 Minimum: 50.000 Maximum: 100.000
6. Based on the maximum background gross gamma scan reading, the scan MDC (Minimum Detectable
Concentration of Th-232), the corresponding N (Minimum Number of Required Samples) and L (Triangular
Grid Node Length) for a standard 2,000 m2 Class I survey unit are:
* Gross Ganna Scan MDC (pCi/g): 5.7
* Minimum Number of Samples (N): 9 Triangular Grid Node Length (L): 16.0 in
7. If the area of the Survey Unit is less than 2,000 n 2, recalculate the corresponding Triangular Grid Node
Length (LI) for the Survey Unit Area (A), using the following formula: L, = (A/(0.866 x 9))112: 13.3 m
8. If N is greater than 9 and the A is other than 2,000 m2, recalculate the corresponding Triangular Grid Node
Length (LI) using the following formula Li = (A/(0.866 x N))112: N/A
9: If A is greater than 2,000 rn2 and N is equal to 9, recalculate the minimum number of samples (NI)
corresponding to a Triangular Grid Node Length (L) of 16 m using the following formula N1 = A / (0.866 x
152 ), N,: N/A
10. Calculate the height (h) of the equilateral triangle with side length equal to L (or (LI) using the following
formula: h = ((L2 - (LU2) 2f: 11.5 M.
Q:nP4OOO\'A4072\FSS Rcports\Volme IlWSurvey Unit FSSB 007\Attachnent B - Soil Survey Unit WorksheetsASoil Survey Unit Worksheet No. Idoc
1 Soil Survey Unit Worksheet No. 2Random Number Generator for Start Point
Final Status SurveyThorium Remediation Project
Tulsa, Oklahoma FacilityKaiser Aluminum & Chemical Corporation
SURVEY UNIT: KAISER-FSSB-007
RANDOM START POINTx axis (Meters) y axis (Meters)
18 25 lower boundupper bound
Northa
(0,0) x axis
O:-J'40OOPA40Or2\FSS ReportsVolurne 1I~RSurvey Unit FSSB 007VWtachmrent B - Soil Survey Unit Work~sheets\Sod Survey Unit Worksheet No. 2
ATTACHMENT C
LABORATORY ANALYTICAL RESULTS
Outreacht iiboratory
Nth AspenAoken AMow., OK 74012
(918) 251 -2515FAX (918) 251-0008
November 15, 2005 R4 ob 6/. F;O,-
David WeyantKaiser Aluminum & Chemical7311 E. 41st StreetTulsa, OK 74145
Project: Kaiser Thorium Remediation PA-40004072OUTREACH LAB ID: 20050810
Dear Mr. Weyant:
Please find enclosed the amended analytical report for the above mentioned projectoriginally reported on 11/7/05. The following eighteen samples were reanalyzed uponyour request: #4 - #7, #9i #11 - #14, #18 - #20, #23, #28, #31, #32, #35, and #44.Normally we would charge for reanalysis if the results are not significantly different.Although, they were not, we did not charge you based on our previous conversation.
All Quality Control for the requested analyses is reported on the analytical report. Thelaboratory control standard and duplicates for all analyses were within method controllimits.
* Your samples will be returned as requested.
Thank you for choosing Outreach Laboratory and if you have any questions, please callus at 918-251-2515.
(ADDITO AL HARGE MAY PP Y)A OR* ' 1t 2SO4 pHd 'J 2 ~ %
REOUE TURNAROUND TIME 5. NSOHSp111(A MN D U 4 ' N I
SAMPL. R) REMARKS
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B.- .lME1,Y __ECEIVED B____________
|RE=LINQUISHED BY |C1 ATE -TIME RE=CEiVE:D BY .. DATF -TIMF
My signature on this chain of custody form InIalites that I amn authorized by the above company to release samples for enalysl. The company agrees to pay the enti babanc upot receiptof sample data and It Is understood and agreI$ that aty balance carned over thirty (30) days Is subject to a 1.5% per month (18% por annum) late charge. In the event od default the companybecomes legally Pable for any reasonable attomey andtor collection fees and an related coots necessary to remit the entire balance to Outreach Technologies. Inc. (Outreach Laboratory).
"I.Wf l I.- I Y
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'4JUTREACH-LABORATORY
INCHAIN C. MUTODY.
I,--rit-
311 North AspenBroken Arrow, OK 74012Phone: (918) 251-2515Fax: (918) 251-0008
q
.. Results To:LOW,,b. '
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Company " - / bh 7Name IAddressPh 'a hL R I a S
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Company Aa RŽI ir-Z P A fl
Name i.A-(X A
AddresS3 1l ¶ .* 'q I~ v, ,-CltyA.X~....State-!4...zip27 N I._ I
PO # K 0 A % -41 a? L c CONTAINER PRESERVATIVE _POET4 7C SIZE S6
PROJECT# N /~k ' WQ - t TOT0 1. HNO3 pH-d C 3PROJECT NAME N\'t 2L L Zf~" 2 . fe MCIp4 4
MEA OR S. N&SO pHd1REU ES7D T1URNAROUND T G s NTONpGLASS(ADDITIOA HARGES MAYALPPILY) N
SAMPLE M s . R REMARKS
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- I _ S =AMA rk;J j._I TX 6 xT
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RELINQUISHED BY . . DATE .TIME - RECEIVED SBYAE . TM .My signature on this chain of custody form Indit that I am authorized by the above cOm'panvy to release sample. for analysis. The company agrees to pay the entore balance tiport receiptof sample data and RIls understood and agreed .Iany balance carrIed over thirty (30) days Is subject to a 1.5% per morth (I18% per annum) late charge. In Ithe event oi defalt fth companybecomes legally lable for any reasonable attorney andl/or collectson teest and oll related cogta necesealy to remfl the entire balance to Outreach Technologles. Inc (Outreach Latboratoe).-
~~~~~~~m T t@ -_ =.2Z
( JUTREACHLABORATORY
I -
CHAIN 6. CUSTODYt.E-
311 North AsbenBroken Arrow, OK 74012Phone: (918).251-2515Fax: (918) 251-0008
, ' Results To:
L4.zcA'
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Address _filV
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Company -k ~& Axux'3 .9C2d-Name' Q Lb a,%4y&A
Bill To:
Name' pm AJ57AA jA A
City W- A State-- -l~pj 14 (1 q _Phone/Ž la&' 3 Q1 4 Fax #1 N -1 iMŽ -bL
PO# it'-A. _l.A C CONTAINER PRESERVATIVE
PROJECT# rb 0 1. HNO pHd 2 a-~Ak~Sn. N2.Ic.ACj
PROJECT NAME h'"-" T PLASTIC 3. HtiCpHd . _
R ESTED TURNAROUND TIME 2oA OR S. H2S0H pHd 1(ARE 5INAL CHARGES MAY APPLY) I GLASS. NO1,NE
SAsg eR REMARKS
| 4DATi!iR ^ TIME (I. || t.E. FILTERED, UNFILTERED,CLIE4SAMLE ATE IMEGRAB, COMPOSITE)10 SAMLEDh SAMPIED MATRIc.
h - 1 - w 14 W1 t fi . N /G '
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|My signature on this chanocuodfomnd ta tIm authorkzed by the above company to release samples for anayssis. The company agrnees to pay th entin balance tipon recelpt |beoe lrpegatylabt fr aisnyreastonabl attoe and/or collection fee and aitrelated cat nesar 10rmt te Inthr baac to Oureact Tchoompsn.Otec Lbntoy)
JUTREACH: CHAIN % DUSTOIY.LI
Results To: Company N&61QftL -. hla r! 3 4 * (. Bill To: -
LABORATORY [ I-- L' 6aName itIWNZ R. M~ (L CompanY, APA-A
My'sIgnature on ts chain of custody Indlc hat I am authorized by the above companyto release samples for analysis. The company agrees to pay the entire balance pon receiptof sample data and It s understood and agreed that any balance carried over thirty (30) days is subject to a 1.5% per rnonth (18% per nnum) late charge. In the event od default t companybecomei legally liable for any reasonable attorney and/or Collection fees and an related coats necessary to remit the entire balance to Outreach Technologies. Inc. (Outreach Laboratory)_
SAMPLE Lb irt
Date Received: 10/7/05 10:35.25
SampleNumber
ClientSample ID
Lab Number:
Date'SampledMatrix
ContainerType
ContainerSize
20050810 . Due: 11/4105.
PreservationCustody SealSeal Intacf
20050810-01 A K-1065.Percent Moisture (LOD)
Th-232 by Gamma Spec
Soil 10/04/05 Plastic 16oz : None Yes Yes
20050810-02 A K-1066Percent Moisture (LOD)
Th-232 by Gamma Spec
Soil 10/04/05 Plastic
20050810-03 A . K-1067Percent Moisture (LOD)
Th-232 by Gamma Spec
Soil 10/04/05 Plastic
16oz
16oz
16oz
None
None Yes
Yes
Yes
Yes
Yes20050810-04 A K-1068Percent Moisture (LOD)
Th-232 by Gamma Spec
Soil 10/04/05 Plastic None Yes
20050810-05 A K-1069Percent Moisture (LOD)
Th-232 by Gamma Spec
20050810-06 A K-1070Percent Moisture (LOD)
Th-232 by Gamma Spec
Soil 10/04/05
10/04/05
Plastic
Plastic
16 oz
16 oz
None Yes Yes
YesSoil None Yes
20050810-07 A K-1071Percent Moisture (LOD)
Th-232 by Gamma Spec
Soil 10/04/05 Plastic
20050810-08 A K-1072. Percent Moisture (LOD)
Th-232 by Gamma Spec
Soil. 10/04/05 Plastic
16oz
16 oz
16 oz
None
None
Yes
Yes Yes
Yes
Yes
Yes
20050810-09 A K-1073Percent Moistuie (LOD)
Th-232 by Gamma Spec
Soil 10/04/05 Plastic. None Yes
20050810-10 A K-1074 Soil 10/04/05 Plastic 16 oz None Yes
Percent ht C(LOD)
Th-232 by purma Spec
Soil20050810-11 A K-1075Percent Moisture (LOD)
Th-232 by Gamma Spec
20050S10-12 A K-1076
Percent Moisture (LOD)
Th-232 by Gamma Spec
10/04/05 *Plastic
Soil
Soil
10/04/05
10/04/05
Plastic
Plastic
16 oz
16 oi
16 oz
None Yes
Nnne Yes
Yes
Yes
Yes20050810-13 A K-1077
Percent Moisture (LOD)
Th.232 by Gamma Spec
None Yes
20050810-14 A K-1078Percent Moisture (LOD)
Th.232 by Gamma Spec
Soil 10/04/05 Plastic
10/04/05 Plastic
16 oz
16 oz
None
None
Yes Yes
Yes - Yes20050810-15 A K-1079Percent Moisture (LOD)
Th-232 by Gamma Spec
Soil
20050810-16 A K-1080Percent Moisture (LOD)
Th.232 by Gamma Spec
Soil 10/04/05 Plastic
20050810-17 A K-1081Percent Moisture (LOD)
Th-232 by Gamma Spec.
Soil 10/04/05 Plastic
20050810-18 A K-1082Percent Moisture (LOD)
Th-232 by Gamma Spec
Soil 10/04/05 Plastic .
16 oz
16 oz.
16 oz
16oz
16oz
None
None
None
Yes
.Yes
Yes
Yes
Yes
Yes
Yes.
Yes
20050810-19 A K-1083Percent Moisture (LOD)
I h-232 by Gamma Spec
Soil 10/04/05 Plastic None
None
Yes
YesSoil20050810-20 A K-1084Percent Moisture (LOD)
Th-232 by Gamma Spec
10/04/05 Plastic
C20050810-21k K- 1O085
Percent M%.-.dre (LOD)
Th-232 by Gamma Spec
20050810-22 A K-1086Percent Moisture (LOD)Th-232 by Gamma Spec
20050810-23 A K-1087Percent Moisture (LOD)Th-232 by Gamma Spec
20050810-24 A K-1088Percent Moisture (LOD)
Th-232 by Gamma Spec
20050810-25 A K-1089Percent Moisture (LOD)Th-232 by Gamma Spec
20050810-26 A K-1090Percent Moisture (LOD)
Th-232 by Gamma Spec
Soil
Soil
Soil
Soil
Soil
Soil
-. _i
10/04/05 - tic
10/04/05. Plastic
10/04/05 Plastic
10/04/05 Plastic
10/04/05 Plastic
101 Plastie
t~ ja/,a_,7
16 oz
16 oz
16 oz
16oz
16 oz
16 oz
None
Nbne
Yes
Yes
None Yes
Ye-
Yes
Yes
Yes
Yes
Yes.
None Yes
None
None
Yes
Yes
* 20050810-27 A K-1091Percent Moisture (LOD)
Th-232 by Gamma Spec
Soil 10/04/05 Plastic 16oz None Yes Yes
20050810-28 A K-1092Percent Moisture (LOD)
Th-232 by Gamma Spec
20050810-29 A K-1093Percent Moisture (LOD)
Th-232 by Gamma Spec
20050810-30 A K-1094rercen; 2itu e A LO)
Th-232 by Gamma Spec
Soil
Soil
Soil
* 10/04/05 Plastic
10/04/05 Plastic
10/04/05 Plastic
16 oz
16 oz
16 oz
None . Yes
None Yes
Yes
Yes
YesNone Yes
20050810-31 A .X-1095 Soil 10/04/05 Plastic 16 oz None Yes Yes
rTrcenh;3 b e (L.a ) .Th-232 by . a.maSpec
.MC
* Soil20050810-32 A K-1096Percent Moisture (LOD)
Th-232 by Gamma Spec
20050810-33 A K-1097Percent Moisture (LOD)Th-232 by Gamma Spec
20050810-34 A K-1098Percent Moisture (LOD)
Th-232 by Gamma Spec
10/04105 Plastic 16 Oz. None Yes Yes
'Soil
Soil
Soil '
Soil
10/04/05 Plastic
10/04/05 Plastic
16 oznews
20050810-35 A K-1099Percent Moisture (LOD)
Th-232 by Gamma Spec
20050810-36 A K- 100Percent Moisture (LOD)
Th-232 by Gamma Spec
10/04/05 Plastic.
16oz
16 oz
16 oz
None Yes
None. Yes
Yes
Yes
Yes10/04/05 Plastic None Yes
20050810-37 A K-1 101Percent Moisture (LOD)
Th-232 by Gamma Spec
20050810-38 A K-1 102Percent Moisture (LOD)
Th-232 by Gamma Spec
20050810-39 A K-1 103Percent Moisture (LOD)
Th-232 by Gamma Spec
Soil
Soil
Soil
Soil
Soil
10/04/05 Plastic
10/04/05 Plastic
10/04/OS Plastic
10/04/05 Plastic
10/04/05 Plastic
16 oz
16oz
16oz
16 oz
16oz
None
None
Yes
* Yes
20050810-40 A K-1 104Percent Moisture (LOD)
Th-232 b- Ga-mma .. Sp
20050810-41 A K-1105Percent Moisture (LOD)
Th-232 by Gamma Spec
None
None N
None
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Ce-:ZUUtlUS1U-4" ;K-1 1U6
Percent M; re (LOD)
Th-232 by Gamma Spec
'10/04/05 ;- ticSoil
20050810-43 A K-1 107Percent Moisture (LOD)
Th-232 by Gamma Spec
20050810-44 A K-1 108Percent Moisture (LOD)Th-232 by Gamma Spec
Soil
Soil
10104105 Plastic
16 oz
16 oz
16 oz
None Yes Yea
Yes
Yes
None Yes
. 10/04/05 Plastic * None Yes
CONTAINEf INSP
# Coolers !
SAMPLE INSPECT
Custody Seals Broki
ECTION I
Custody Seals Broken - YIN Temperature Blue Ice/ Wet Ice Radiation Survey fixed removable
'ION
!n - Y/N Chain of Custody Recor 'IN Labels In TactA/N Radiation Survey Complete Y/N
Anomalies:
Inspected By:
QA or Designee Review:
Sample Custodian Review
DATE
:tDATE EI/ ZI
DATE 1 7-t 5
Project Notes:
Outreachboratory
KV~ken. w. OK740o December 13,2005(918) Z51-2515FAX (918) 251-0008
David WeyantKaiser Aluminum & Chemical7311 E. 41st StreetTulsa, OK 74145
Project: Kaiser Thorium Remediation PA-40004072OUTREACH LAB ID: 20050987
Dear Mr. Weyant:
Please find enclosed the analytical report for your samples received in our laboratory onDecember 07, 2005 for the above captioned project. Ten soil samples were received ingood condition and analyzed by Gamma Spectroscopy without drying and grinding andPercent Moisture with an expedited 5-work day turn. Results were faxed early on12/13/05.
All Quality Control for the requested analyses is reported on the analytical report. Thelaboratory control standard and duplicates for all analyses were within method controllimits.
Your samples will be returned as requested.
Thank you for choosing Outreach Laboratory and if you.have any questions, please callus at 918-251-2515.
I IJ \t.. I . F 1 I .t. .00 ,,l I/ D D7 E f;TIMEi > 4 rRECEIVEDBY: = / DATEŽ ;2L/;llMvtL
RELINQUISHED BY: DATE. TIME RECEIVED-BY.: DATE . T1ME-. :|My signature on this chain of custody I tes that I am authorized by the above company to release sample Th company agree to pay the erdIre balance upon recelptof sample data and It Is understood and a ed that any balance carrled over thirty (30) days Is subject to a 1.5% per mith (18% perannum) late charge. In the eved of default, the companybecomes legally liable for any reasonable attomy and/or collection fees and at related costs necessary to remit the entire balance to Outreich Technologies, Inc (Outreach Laboratory)
SAMPLE RETUIN/DISPOSAU At non hazar s shal b a sp d O 30 days after issu i fInal reporCAtn others *' be retumed at clienti e54nen|
SAMPtC IGIN Gle
Date Recelved: 12/7/05 10:42:35
SampleNumber
ClientSample ID
Lab Number:
DateMatrix Sampled
z^;A 1 t MVUJ
Q0050987
ContainerType
£r l1tic
ContainerSize
i6 oz
* Due: 12114/05
Custody SealSeal Intact
20050987-01 A K-1346Gamma Spec - Thorium 232
Pcrcent Moisture (LOD)
Preservntion
None Yes Yes
20050987-02 A K-1347Gamma Spec - Thorium 232
. Percent Moisture (LOD)
Soil
20050987-03 A K-1348Gamma Spec - Thorium 232
Percent Moisture (LOD)
.Soil .
12/06/05 Plastic
12/06/05 Plastic
12/06/05 Plastic20050987-04 A K-1349Gamma Spec - Thorium 232Percent Moisture (LOD)
20050987-05 A K-1350Gamma Spec - Thorium 232Percent Moisture (LOD)
Soil
Soil
Soil
12/06/05
12/06/05
Plastic
Plastic
16.oz
16 oz
16oz
16 oz
16oz
16oz
16oz
None Yes
None
None Yes
Yes
None Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
20050987-06 A K-1351Gamma Spec - Thorium 232Percent Moisture (LOD)
None Yes
20050987-07 A K-1352Garmma Spec - Thorium 232
Percent Moisture (LOD)
Soil 12106/05 . Plastic None Yes
20050987-08 A K-1353Gamma Spec - Thorium, 232Percent Moisture (LOD)
Soil 12106/05 Plastic None Yes
20050907-09 A K-1354Gamma Spec - Thorium 232
Percent Moisture (LOD)
20050987-10 A K-1325
Soil 12/06/05
12/06/05
Plastic
Plastic
16oz
16'oz
None Yes Yes
YesSoil None Yes
Pnera I
Perce c ture(LOD) tI
CONTAINER INSPECTION
# Coolers Custody Seals Broken 0 Temperature Ice
SAMPLE INSPECTIONSample Seal Broken NA Chain of Custody Record Labels In Tact
Anomalies
fC
- Radiatfon Survey: <300 cpm
Radiation Survey Complete . .0
Inspected By: CJ DATE 1X ,~ ^2 -7 12 4
QA or Designee Review: DAAE I/'7 ('>Sample Custodian Review. ATE
Soil Survey Unit Worksheet No. 1Soil Survey Unit Worksheet No. 2
Laboratory Analytical Results
Q:\P400OOPA4072\FSS Reports\Volume lMhurvcy Unit FSSB OO8\FSSB 008 TOC.doc
Final Status Survey ReportVolume III - Pond Parcel Excavation Backfill Units
Sub-Report No. BCM-008Survey Unit Kaiser-FSSB-008Thorium Remediation Project
Tulsa, Oklahoma FacilityKaiser Aluminum & Chemical Corporation
March 22, 2006
1.0 BACKGROUND
This sub.-report documents the results of pond parcel excavation backfill unit final status surveyactivities completed as part of the Thorium Remediation Project at the Tulsa, Oklahoma facility(Figure 1). Specifically, this technical report addresses the final status survey of Survey UnitKaiser-F'3SB-008, which consists of a unit of Below Criteria Material or BCM (less than 31.1net pCi/g Th-232 material) placed in an excavation resulting from the removal of radiologically-affected soil from .the Retention Pond area. Survey Unit Kaiser-FSSB-008 is considered a Class1 survey unit with an approximate base surface area of 1,431 m2. It is located on the east side ofthe pond. parcel within the excavation bottom associated with Survey Unit Kaiser-FLSS-019(Figure 3). The survey unit is bordered by excavation backfill Survey Unit Kaiser-FSSB-007 tothe north, excavation backfill Survey Unit Kaiser-FSSB-005 to the east, by a wall of non-impacted soil (clean import borrow material) to the south, and excavation backfill Survey UnitKaiser-FSSB-012 to the west.
A total of eight 2-foot layers (lifts) of BCM material was placed in Survey Unit Kaiser-FSSB-008. It should be noted that BCM was placed in excavation backfill Survey Units Kaiser-FSSB-007 ;nd Kaiser-FSSB-008 simultaneously.
Separate distinct final status surveys were completed for the pond parcel excavation bottomsurvey units prior to backfilling with BCM. The final status survey of the pond parcelexcavation bottom survey units is documented in Volume I of the Final Status Survey Report.
Q-4WOONA4072UMS Repnsq\Vdoue UlS-Wy t FSS1 00MS8 0t Ad= Revision 03/22/06
2.0 SURVEY ACTIVITIES AND RESULTS
This section of the sub-report presents the final status survey data for the BCM placed withinSurvey Unit Kaiser-FSSB-008. The final status survey consisted of a gross gamma scan of eachplaced 2-foot lift of BCM and systematic soil core sampling upon completion of the BCM unit.
2.1 G(ros:s Gamma Scan
Each 2-foot lift of BCM was surveyed through a 100 percent coverage gamma scan to confirmacceptable radiological conditions and identify any elevated areas. During the scanning of eachlift, Ihe detector was held close to the BCM surface (1 to 2 inches) and moved in a serpentinepattern. Approximate equal-distant background measurements were also obtained at 1--meterabove the ground surface for each lift of BCM placed. A statistical summary of the backgroundsurvey and 100 percent coverage gamma scan of each BCM lift placed in the survey unit isprovided below in Table 1.
Table 1-- Gross Gamma Scan Results Summar_Lift No. of ScanArea 2-sec. Rate Ave. Stdev. Min. Max. M edian
d. 09/27/05 710 8 N/A 61,879 3,115 57,792 66,804 62,435
Contour maps of the gross gamma background and final (as-left condition) scanning surveyresults are presented by BCM lift on Figures A-I through A-8 contained in Attachment A.The 100 percent coverage gross gamma scan of the 2-foot lifts did not indicate the presence ofsmall areas (1 m2) of elevated activity (above the DCCL for the site).
2.2 Systematic Soil Core Sampling
The final status survey also consisted of systematic soil core sampling based on a random' startpoint: and an equal-distant triangular grid. The Minimum Number of Core Samples (core holes)Required (N) based on the scan MDC was determined to be 9, as documented on Soil SurveyUnit Worksheet No. 1 (Attachment B). Once N was determined, the Survey Unit Area (A) of1,431 m2 along with the N of 9 were used to calculate the Triangular Grid Node Length (L) of13.6 meters and the Height of the Equilateral Triangle (h) of 11.7 meters. A random star. pointwas generated using the random number feature of Excel and documented on Soil Survey UnitWorksheet No. 2 (Attachment B).
A layout of the soil sampling locations is provided on Figure A-9 contained in Attachment A.The :oil core sample locations were demarcated in the field using a GPS unit. A total of 9 coreholes (sample locations) were installed on the grid prescribed over the survey unit (Core Nos. 1through 9). The core holes were of various depths depending on the location within the surveyunit. Core Segments of BCM (typically 3 feet in length) were scanned in the field in 1-footincrements and were also characterized by a 1 minute static count of gross gamma activity. Theresults are presented below in Table 2.
Q 4?A407MWS Rq prtAVo= e UlrSom t nSaSSB cc, te.Ldc3 Revision 0:3/22/06
Static Count values (cpm) are equal to the Gross Static Count minus a background value of 25,645cpm, the average of 5 consecutive 1-minute counts performed with the detector on top of the table used toscan the cores, prior to scan activities.
A composite sample representing each core segment was then prepared by combining each set ofthree 1-foot increments in a bucket and breaking up the cores. The final segment of core may beless Ihan or greater than 3 feet depending on the point at which virgin material was encountered.A sample (usually between 500 and 800 grams) was taken from each composite and forwardedto Outreach for analysis of Th-232 activity concentration. Analytical results are provided belowin Table 3. Analytical data reports are contained in Attachment C.
7 C 36 K-1147 7 21.6 1.91 0.781S D 36 K-1148 10 19.0 1.31 1.147 E 48 K-1149 13 23.0 1.72 0.6473 A 36 K-1150 1 17.2 0.715 0.9338 B 36 K-1151 4 22.9 1.45 0.7708 C 36 K-1152 7 26.5 1.16 0.6648 D 36 K-1 153 10 24.1 1.17 1.198 E 36 K-1154 13 25.7 2.37 0.7209 A 36 K-1155 1 18.9 0.936 0.7559 B 36 K-1156 4 17.4 1.07 0.5229 C 36 K-1157 7 21.2 1.42 1.089 D 36 K-1158 10 24.0 1.36 0.7699 E 60 K-1159 13 24.9 1.15 0.763
Count: 45= = Average: 21.1
St. Dev.: 3.70Minimum: 9.47 = =Maximum: 27.4Median: 21.7
The gross and net Th-232 activity concentrations for all 45 systematic composite samples werebelow the BCM surrogate value of 31.1 pCi/g net Th-232 activity concentration (DCCL). Themaximum gross Th-232 activity concentration was 27.4 pCi/g. The average gross Th-232activity concentration was 21.1 pCi/g. The standard deviation of the 45 composite samples was3.70, which fell below the estimated standard deviation of 4.4 used to calculate the minimumnumber of samples required in the decommissioning plan.
2.3 'ilcoxon Rank Sum (WRS) Testing
The analytical results for the systematic soil core composite samples were evaluated using theprocedure contained in Appendix C, Volume I of this Final Status Survey Report (WilcoxonRank Sum Test). The evaluation showed that the survey unit core sample results meet the I)Pstatistical criterion based on the first statistical test as described below.
Q .W\400"?4O72\FPS R vt.\olme M,-S U.it MFSB r MBOOS\B 008 t 8 Revision 03/22'06
If the difference (27.0 pCi/g) between the maximum survey unit soil sample activityconcentration (27.4 pCi/g) and the minimum reference background area soil sample activityconcentration (0.36 pCi/g) is less than DCCL (31.1 pCi/g), then the survey unit meets the releasecriterion. Table 4 presents a summary of the data used to complete the statistical evaluation ofthe survey unit.
Table 4 -- Reference Group and Survey Unit Sample ResultsReference Th-232 Survey Unit Th-232
Survey Unit Kaiser-FSSB-008 which consists of a unit of BCM placed in an excavation resultingfrom. the removal of radiologically-affected soil from the Retention Pond area, is considered aClass 1 survey unit with an approximate base surface area of 1,431 rn2. It is located on the eastside of the pond parcel within the excavation bottom associated with Survey Unit Kaiser-FSS-019 (Figure 3). The survey unit is bordered by excavation backfill Survey Unit Kaiser-FSSB-007 to tha north, excavation backfill Survey Unit Kaiser-FSSB-005 to the east, by a wall of non-impacted soil (clean import borrow material) to the south, and excavation backfill Survey UnitKais.r-FSSB-012 to the west.
A total of eight 2-foot layers (lifts) of BCM material was placed in Survey Unit Kaiser-]SSB-008. It should be noted that BCM was placed in excavation backfill Survey Units Kaiser-FSSB-007 .md 1Kaiser-FSSB-008 simultaneously.
The acceptance criterion for BCM survey units at the Tulsa facility is the DCCL of 31.1 pCi/gnet Th-232 activity concentration. The final status survey consisted of a gross gamma scan ofeach placed 2-foot lift of BCM and systematic soil core sampling upon completion of the BCMunit. The results of the final status survey activities were as follows:
* The 100 percent coverage gamma scan of each lift (final as-left condition) did notindicate the presence of small areas (1 m2) of elevated activity (greater than the DCCLfor the site).
* All 45 systematic composite sample results (gross and net) were below the BCMsurrogate value of 3 1.1 pCi/g net Th-232 activity concentration (DCCL).
* Thie analytical results meet the DP statistical criterion based on the first statisticalevaluation of the data (WRS Test procedure).
The results of the final status survey activities show that Survey Unit Kaiser-FSSB-008 meets theDP acceptance criteria.