ML103190708

Nasa Technical Basis Document PBRF-TBD-10-001, Supplemental Radiological Characterization of Plum Brook Section 2

ML103190708
Person / Time
Site:	Plum Brook
Issue date:	11/12/2010
From:	Peecook K US National Aeronautics & Space Admin (NASA)
To:	Document Control Desk, NRC/FSME
References
PBRF-TBD-10-001
Download: ML103190708 (74)

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"' National Aeronautics and Space Administration John H. Glenn Research Center Lewis Field Plum Brook Station Sandusky, OH 44870 November 12, 2010 Reply to Attn of:QD U.S. Nuclear Regulatory Commission Attn: Document Control Desk Washington, D.C. 20555

Subject:

Technical Basis Document PBRF-TBD-10-001, "Supplemental Radiological Characterization of Plum Brook Section 2", Licenses Nos. TR-3, Docket No. 50-30 and R-93, Docket No, 50-185 This letter submits the report on the final characterization studies of Plum Brook Section 2.

National Aeronautics and Space Administration (NASA) requested an amendment to the operating licenses by letter dated January 9, 2009 (ML090140338). The requested amendment would address the final radiological release criteria for the environmental areas along Plum Brook outside of the Plum Brook Station properties. The amendment request was supported by a supplemental submittal dated March 20, 2009 (ML090900743). This submittal included Technical Basis Documents PBRF-TBD-08-005, "Radiological Characterization of Plum Brook Sediments", Revision 1, and PBRF-TBD-08-006, "Revised Dose Assessment for Plum Brook Sediments", Revision 0.

Following NRC Staff review of the submittals, the NRC staff requested additional information in their letter dated June 11, 2009 (ML091520446). Some of the areas questioned by the staff in their review included inconsistencies in the scope of characterization sampling performed in section 2 of Plum Brook when compared to the extensive sampling completed in other areas.

NASA responded to the Request for Additional Information by letter dated October 6, 2009 (ML092870784).

In discussions with the NRC Staff following receipt of NASA responses, NASA committed to perform additional radiological characterization of Plum Brook Section 2 sediments. This commitment was reflected in the NRC Staff Safety Evaluation supporting NRC issuance of Amendment 14 to License TR-3 and Amendment 10 to License R-93 on February 1, 2010 (ML100120679).

This submittal completes NASA's actions on characterization and assessment of residual radioactivity in Plum Brook.

2 Should you have any questions or need additional information, please contact me at NASA Plum Brook Station, 6100 Columbus Avenue, Sandusky, Ohio 44870, or by telephone at (419) 621-3277.

Sincerely, Keith M. Peecook NASA Decommissioning Program Manager Enclosures *

1. Technical Basis Document PBRF-TBD-10-001, "Supplemental Radiological Characterization of Plum Brook Section 2", revision 0, dated November 10, 2010 cc:

USNRC/C. J. Glenn (FSME)- CD-ROM Copy USNRC/J. Webb (FSME)- CD-ROM Copy USNRC/J. Tapp RIII/DNMS/DB- CD-ROM Copy ODH/M. J. Rubadue- CD-ROM Copy

Plum Brook Reactor Facility Technical Basis Document Supplemental Radiological Characterization of Plum Brook Section 2 PBRF-TBD-10-001 Revision No. 0 Prepared By: B. Mann Date: ('48 (0 Independent Technical R. Case Date: _____

Review:

Other Review: Date: ______

Other Review: Date:

Cognizant Manager Approval:

W. Stoner /) A, Date: 111500.

Date: /"/?/*/0 RSO Approval: W. Stoner Form AD-04/02 Rev 0 I

TBD-10-001, Rev. 0 NASAS PBRF DECOMMISSIONING PROJECT CHAN,,GEANCELLATI"N RECORD DOCUMENT TITLE: DOCUMENT NO: TBD-10-001 REVISION NO: 0 Supplemental Radiological Characterization of Plum Brook Section 2 Revision 0: Initial issue of document.

Form AD-01/ 3 Rev 1 ii

TBD-10-001, Rev. 0 LIST OF EFFECTIVE PAGES DOCUMENT NO: TRD-10-O01 REV'ISION NO.: 0 Page No. Revision Level Page No. Revision Level Page No. Revision Level Cover Page 0 Change/Cancella 0 tion Record LOEP 0 TOC (1 page) 0 Text 27 pages 0 Appendix A 0 (2 pages)

Appendix B 0 (13 pages)

Appendix C 0 (12 pages)

Appendix D 0 (11 pages) 4 I .4 4 4 I .4 4 4 I .4 4 4 I .4 I 4 I .4 4 Form AD-Oi/ 5 Rev 2 111

TBD-10-001, Rev. 0 TABLE OF CONTENTS 1.0 Summ ary .......................................................................................................................... 1 2.0 Introduction ............................................................................................................... 2 3.0 Background ............................................................................................................... 3 3.1 Previous Characterization ......................................................................................... 3 3.2 D ose A ssessm ent ..................................................................................................... 4 3.3 N RC Request for Additional Inform ation ............................................................... 6 4.0 References ............................................................................................................... 7 5.0 D escription of Plum Brook Section 2 .......................................................................... 9 5.1 Stream Sections ....................................................................................................... 9 5.2 Sedim ent Deposition Characteristics ...................................................................... 10 6.0 Survey D esign and Sam pling Plan ............................................................................. 12 6.1 D ata Q uality O bjectives ......................................................................................... 12 6.2 N um ber of Sam ples ........................................................ ............................................ 13 6.3 Sam pling A ided by G am m a Scan Surveys ............................................................. 14 6.4 Evaluation of Flood Backw aters ............................................................................. 14 6.5 Other Radionuclides of PBRF O rigin .................................................................... 15 7.0 Results ............................................................................................................................ 15 7.1 Survey M odifications ............................................................................................. 15 7.2 Sam ples A nalyzed .................................................................................................. 16 7.3 Estim ated M ean Cs-137 Concentration ................................................................. 16 7.4 Concentration versus D epth ..................................................................................... 17 7.5 Frequency D istribution ........................................................................................... 18 7.6 Frequency of Sam ples w ith Elevated A ctivity ..................................................... 20 7.7 Concentration versus D ow nstream D istance .......................................................... 20 7.8 Scan Survey and Investigative Sam ple Results ...................................................... 21 7.9 Investigation of Flood Backw ater Areas ............................................................... 22 7.10 Other Radionuclides ............................................................................................ 25 7.11 D ose A ssessm ent U pdate ........................................................................................ 26 7.12 Conclusions .......................................................................................................... 27 8.0 Appendices .................................................................................................................... 27 A ppendix A - Plum Brook Section 2 Survey Transect M ap ....................................................

Appendix B - Sampling Plan for Characterization of Plum Brook Section 2 ..........................

A ppendix C - PBRF Laboratory Sam ple A nalysis Results ......................................................

A ppendix D - Vendor Laboratory Report (Excerpt) ................................................................

iv

TBD-10-001, Rev. 0 LIST OF TABLES Table 1, Average Cs-137 Concentrations Measured in Plum Brook Stream Sections ....... 4 Table 2, Frequency of Samples with Elevated Activity in Plum Brook Stream Sections.. 4 Table 3, Dose Calculation Results for Section 2 Exposure Scenarios ............................ 6 Table 4, Samples Sent to Vendor Laboratory ............................................................... 15 Table 5, Field Modifications to Survey Transects ....................................................... 16 Table 6, Cs-137 Concentrations in Stream Bed and Banks .......................................... 17 Table 7, Cs-137 Concentration vs. Depth .................................................................... 17 Table 8, Cs-137 Concentration vs. Depth in Stream Bed ............................................ 18 Table 9, Cs-137 Concentration vs. Depth in Stream Banks ......................................... 18 Table 10, Update of Table 2 -Frequency of Samples with Elevated Activity ............ 20 Table 11, Samples Collected within Stream Banks Identified by Scan Surveys .......... 22 Table 12, Summary of Flood Backwater Area Scan Surveys ....................................... 23 Table 13, Samples and Measurements from Flood Backwater Areas .......................... 24 Table 14, Vendor Laboratory Sample Results ............................................................. 25 Table 15, Dose Assessment Results using Updated Source Term Concentrations ..... 26 LIST OF FIGURES Figure 1, Aerial View Showing Plum Brook Stream Course ......................................... 9 Figure 2, Stream Section 2 - Rt. 2 to Plum Brook Country Club ................................. 10 Figure 3, Deposition Settings in Stream Meander Sections ........................................ 12 Figure 4, Differential Frequency Distribution of Cs-137 in Sediment Samples ........... 19 Figure 5, Cumulative Frequency Distribution - Cs- 137 All Samples .......................... 19 Figure 6, Cs-137 Concentration vs. Downstream Distance .......................................... 20 v

TBD- 10-001 Page 1 of 27, Rev. 0 1.0 Summary A supplemental characterization survey of Plum Brook Section 2 was performed in July and August, 2010. The survey was directed by NASA to develop information requested in "Requests for Additional Information" (RAI) from the US NRC regarding the Plum Brook dose assessment [USNRC 2009]. Over three hundred samples of sediment and soil were collected from Plum Brook Section 2 and analyzed by gamma spectroscopy at the PBRF on-site counting laboratory. Four of the highest activity samples were sent to a qualified vendor laboratory for radiochemical analysis for other possible PBRF radionuclides.

Of the 319 samples analyzed, 207 showed detectable activity for Cs-137 (> MDA) and none showed detectable Co-60 activity. Sample Cs-137 concentrations ranged from 0.10 to 18.2 pCi/g with an average of 0.96 + 2.3 pCi/g. This is a biased estimate because the samples included 17 samples located by gamma scan surveys designed to identify areas of "elevated" activity. The unbiased estimate of Cs-137 concentration in stream Section 2 is 0.44 +/- 0.35 pCi/g.

Principal conclusions are:

A statistical sampling design was prepared to yield an unbiased estimate of the Section 2 average sediment activity concentration.

Mean and maximum Cs-137 concentrations in stream Section 2 are less than in Section 1.

Previous dose assessments using exposure scenarios set in Section 2 are conservative

- revised dose calculations using the new survey results obtain doses a factor of two lower than doses calculated using Section 1 characterization results.

Concentration of Cs-137 in sediments shows a decreasing trend with downstream distance in Section 2.

• Extensive scan surveys were performed to identify areas of elevated activity. Areas of elevated activity are infrequent in Section 2 - only three locations (five samples collected) were identified with Cs- 137 concentration above the investigation action level of 7 pCi/g.

• Sediments contaminated with Cs- 137 are largely confined within the stream ravine -

investigation of flood prone adjacent land areas identified only three localized areas with Cs-137 concentrations above background (only slightly above).

Other radionuclides of PBRF origin, including Sr-90, were not detected in Section 2 sediment samples.

TBD-08-005 Page 2 of 27, Rev. 0 2.0 Introduction The Plum Brook is one of several surface streams that drain the 6400 acre NASA Plum Brook Station (PBS) in Erie County, Ohio. It originates in farmland south of the facility and terminates in Sandusky Bay on the shore of Lake Erie northeast of the city of Sandusky. Cesium-137, Co-60, and possibly other radionuclides including Sr-90, entered the Plum Brook as a result of Plum Brook Reactor Facility (PBRF) operations from 1963 to 1973. The radionuclides were released in liquid effluents through a monitoring station into a man-made ditch that emptied into the Plum Brook near the northeastern boundary of the PBS.

This report describes the supplemental characterization of the portion of Plum Brook designated as Section 2. Plum Brook Stream Section 2 runs from the US Rt. 2 overpass north to the interior of the Plum Brook Country Club (PBCC). In the terminology of surface stream hydrology, this stream section comprises the lower meander section. It is bounded upstream, on the south by Section 1, the upper meander section and on the north by the upper flood plain, identified as Section 3. The stream course distance of Section 2 is approximately 6200 feet (1.2 mi.).

Section 3.0, provides background information on the decision to perform additional characterization of Plum Brook Section 2. Section 4.0 lists the references cited in the report. A description of Stream Section 2 is provided in Section 5.0 and the survey design and sampling plan is discussed in Section 6.0. The results are presented in Section 7.0.

Appendices provide supporting information. An aerial view map of Plum Brook Section 2 showing the survey transect locations is provided in Appendix A. 1 Appendix B presents the Sampling Plan. Appendix C presents the results of the on-site gamma spectroscopy analysis of the soil and sediment samples collected. An excerpt of the vendor laboratory report containing analytical results of samples selected for radiochemical analysis is provided in Appendix D.

Transect (noun) is a line or strip established to demark an area to be investigated. Many definitions have been published - one which is consistent with the present application is: "In any field (outdoor) study, a transect consists of a line of study, often divided into intervals where observations or samples are collected". www.hwr.arizona.edu/globe/soilwords.html

TBD-10-001 Page 3 of 27, Rev. 0 3.0 Background This section provides background information on stream Section 2 including previous Plum Brook characterization surveys, dose assessments and the NRC request for additional information (RAI). Results of previous Plum Brook characterization surveys are summarized to provide a baseline reference for discussion of Section 2 supplemental characterization results.

3.1 Previous Characterization An extensive campaign was conducted by NASA from 2005 through 2007 to determine the levels and extent of radioactive contaminants in the Plum Brook and environs [NASA 2009]. Samples of soil and sediments were collected from over 900 locations along the four mile stream course from the PBS to Sandusky Bay. It was found that Cs-137 is the predominant man-made radionuclide in the Plum Brook 'Withdetectable concentrations measured along the stream course from the PBS and into Sandusky Bay. Cobalt-60 was found to be limited mostly to sediments in portions of the Plum Brook near the PBRF.

Detectable concentrations of Cs-137 were measured in sediments deposited in the stream bottom, along the stream banks and in delta deposits in the stream mouth estuary and surrounding wetlands. Detectable concentrations were not found in Plum Brook water.

Objectives evolved for the several characterization surveys conducted between 2005 and 2007. The initial scoping survey, identified as characterization package SVI-04, was designed to determine the extent of downstream transport of PBRF radionuclides in the Plum Brook. From this survey it was concluded that PBRF radionuclides had been deposited throughout the stream downstream of the PBRF and into Sandusky Bay.

Subsequent surveys were intended to determine the levels and extent of contaminated sediments in those portions of the Plum Brook without requiring access through private property. This limited collection of samples from Stream Section 2. Detailed surveys were conducted in Stream Section 1 using MARSSIM methods with the intent to determine if the DCGLs for radionuclides in PBRF soil were satisfied. In parallel with this effort, characterization surveys were conducted to determine levels and extent of contaminated sediments in Stream Sections 3 and 4 (upper flood plain, stream mouth-estuary and Sandusky Bay).

After reviewing these results and discussions with the NRC Staff, it was concluded that completion of MARSSIM-based surveys of the entire Plum Brook to demonstrate satisfaction of the 25 mrem/y dose criterion would be expensive and technically difficult.

It was proposed by NASA to demonstrate compliance with the 25 mrem/y criterion through dose assessment as discussed below. The data available from the 2005 - 2007 characterization surveys was used to support this effort.

Average concentrations reported in the 2009 characterization report for each stream section were used to develop dose assessment source term models [NASA 2009]. Table I shows the estimated average Cs-137 concentration (and standard deviations) for each stream section obtained from the previous characterization surveys. Stream section

TBD-10-001 Page 4 of 27, Rev. 0 average concentrations are estimated from samples selected on a systematic or random basis.

Table 1, Average Cs-137 Concentrations Measured in Plum Brook Stream Sections Stream Stream Course No. of No. of Mean Cs-137 Locations Samples Conc. & Std Dev.

Section Distance (mi.) Sampled (1) Analyzed (1) (pCi/g) (2) 1 1.63 621 1810 1.2 + 2.8 2 1.20 3 16 0.68 + 0.69 3 0.45 106 525 0.54 + 1.33 4 0.65 64 312 0.59 +/- 1.63 Table 1 Notes:

1. The number of locations sampled and number of samples reported in Table I includes only those selected on a random or systematic basis.

2. No Co-60 results are included as the present characterization samples are all < MDA, so no useful comparison with previous characterization survey results can be made.

Source terms for localized areas of elevated activity were also modeled in the Plum Brook dose assessments. These source terms were modeled using the maximum activity concentrations measured in each stream section. Table 2 identifies maximum Cs-137 concentrations measured in each stream section and the average concentration of elevated activity samples. Here, samples with activity concentrations greater than 50% of the Cs-137 DCGL for PBRF soil, (> 7 pCi/g) are included.

Table 2, Frequency of Samples with Elevated Activity in Plum Brook Stream Sections Maximum Cs- Number of Mean Cs-137 Conc. &

Stream 137 Conc. Samples with Std Dev. Of Elevated Section Activity >1 0.5 (pCi/g) DCGL( ) Activity Samples (pCi/g) 1 72.4 253 (0.14) 15.4 + 10.3 2 2.8 None NA 3 14.2 6 (0.01) 10.0 +/- 2.7 4 20.6 32(0.10) 11.2 + 3.7 Table 2 Note:

1. The numbers in parentheses are the fraction of samples showing elevated activity.

3.2 Dose Assessment In 2009, the NASA PBRF Decommissioning Project performed an assessment of radiation exposure to members of the public who could come in contact with contaminated Plum Brook sediments [NASA 2009a]. The purpose of this assessment was to demonstrate that sediment and soil contamination of PBRF origin in the Plum Brook and environs satisfies the same release criteria that apply to the PBRF site (25 mrem/y and ALARA).

TBD-10-001 Page 5 of 27, Rev. 0 Doses to members of the public were calculated for four exposure scenarios using the RESRAD computer code. The scenarios were based on potential exposure conditions in the four stream sections. The settings for two residential scenarios were in the stream meander sections, where all of the stream-side residences are located. The exposure scenario identified as the Brook-side Resident scenario was placed in stream Section 2. In this scenario, a residence was assumed to be constructed on land contaminated with sediments deposited in the vicinity of the stream during a large flood event prior to construction of the home. It is also assumed that the home is situated on an area of contaminated sediment that extends partially beneath the house. The house is assumed to have a 2000 ft2 (186 M2 ) footprint and the contaminated zone underneath is 45.6 m2 in area. The exposure pathways are direct exposure to a resident inside the house (attenuated by the house-structure), direct exposure to contaminated sediments outside the house (lawn and landscaping maintenance), ingestion of contaminated soil and inhalation of suspended sediment (dust). The resident is assumed to spend 1096 hours0.0127 days <br />0.304 hours <br />0.00181 weeks <br />4.17028e-4 months <br /> per year in the portion of the house located on contaminated sediment and 80 hours9.259259e-4 days <br />0.0222 hours <br />1.322751e-4 weeks <br />3.044e-5 months <br /> a year on the contaminated portion of the outdoor property.

The source term was modeled as:

• The principal source is 186 in2 in area and is comprised of a surface layer 6 in.

thick and two subsurface layers each 9 in. thick. This source extended partially underneath the house (46.5 in 2 ).

" A localized elevated area source is modeled as cylindrical three-layer source of one meter radius and is located outside the house. Each layer is 6 in. thick.

In response to an RAI comment from the NRC, a dose assessment was performed for an alternative Brook-side Resident scenario set in Stream Section 2. For the alternative scenario, the principal exposure parameters were modified as follows: The size of the principal zone of contamination that extended beneath the house was increased from 46.5 to 93 m2 and the local elevated area source was moved from outside the house to underneath the house. A new source term component was added to the outdoor area - a garden, from which contaminated vegetables were consumed and direct exposure received for 123 hour0.00142 days <br />0.0342 hours <br />2.03373e-4 weeks <br />4.68015e-5 months <br />s/y while tending the garden. A summary of the doses calculated for the exposure scenarios set in stream Section 2 is given in Table 3. Concentrations of Cs-137 and Co-60 assumed for the source term model elements are shown. Calculated doses from the original TBD-08-006, [NASA 2009a] and alternate dose assessment are compared.

TBD-10-001 Page 6 of 27, Rev. 0 Table 3, Dose Calculation Results for Section 2 Exposure Scenarios Source Term Cs-137 Co-60 Dose (mrem/y)

Component Concentration Concentration (pCi/g) (pCi/g) TBD-08-006 Scenario Alternate Sc (2)

Cont. Zone 9.80E-01 1.1OE-01 3.20E-01 5.44E-01 layer I Cont. Zone C .Ze21.42E+00 1.40E-01 7.34E-02 1.92E-01 layer 2 Cont. Zone 1.20E+00 1.40E-01 2.96E-02 4.96E-02 layer 3 Elev. Local Area lay 5.78E+01 1.60E+00 3.57E-01 2.30E-01 Area layer I Elev. Local 6.53E-01 1.29E-01 8.03E-02 Area layer 2 Elev. Local 2.88E-01 1.53E-02 8.92E-03 Area layer 3 Contaminated Zone in 1.23E+00 1.33E-01 NA 2.30E-01 Garden 9.24 +/- 4.4 1.34E+3

+/- 0.68 0

Total Dose (+/- one standard deviation) => 9.24 E-01I E+00 Table 3 Notes:

1. Original exposure parameters as reported in TBD-08-006 [NASA 2009a].

2. Scenario exposure parameters suggested by NRC Staff in RAI [USNRC 2009].

3.3 NRC Request for Additional Information Requests from the NRC for additional information (RAI) on the Plum Brook dose assessment included comments that questioned the adequacy of characterization information available from Section 2 to support the dose assessment [USNRC 2009].

Comments that relate to Section 2 characterization are summarized:

• "Section 2 had a significantly lower number of sample results for Cs-137 as compared with sample results for Cs-137 for other Sections" (Comment No. 11).

• "It is unclear how it is known that the concentrations in this section are less than or equal to the concentrations in Section 1. The areas in Section 2 that were not sampled are significant in size and it is possible that areas of elevated concentration could have been missed" (Basis remarks following Comment No.

11).

" "Staff cannot determine the basis for why activity concentrations from Section 1 sample results would be conservative for Section 2" (Comment No. 12)

TBD-10-001 Page 7 of 27, Rev. 0 Additional issues raised in the RAI were:

• "More information is needed to confirm that Cs-137 and Co-60 are the only radionuclides of PBRF origin present at levels above background in the Plum Brook" (Comment No. 2).

• Concerns were raised that areas of elevated contamination could occur in land areas adjacent to the Plum Brook due to deposition of sediments during flood events (Comment No. 13, and the Basis remarks following the comment).

In discussions with the NRC Staff following receipt of NASA responses to the 2009 RAI, NASA agreed to perform additional radiological characterization of Section 2 sediments.

4.0 References Gilbert 1987 Richard 0. Gilbert, StatisticalMethods for EnvironmentalPollutionMonitoring, Van Nostrand Reinhold, New York, 1987.

Haag 2007 Haag Environmental Company, Development of Conceptual Model as Basis for Characterization Plan Plum Brook Reactor Facility, Perkins Township, Ohio, Prepared for NASA Plum Brook Decommissioning Program, June 2007.

Haag 2008a Haag Environmental Company, CharacterizationReportfor Plum Brook Sediment in Floodplain Wetlands, Prepared for NASA Plum Brook Decommissioning Program, March 2008.

Haag 2008b Haag Environmental Company, CharacterizationReportfor Plum Brook Sediment in Stream Mouth Wetlands, Prepared for NASA Plum Brook Decommissioning Program, April 2008 Haag 2008c Haag Environmental Company, Plum Brook Sediments - Presentation for Ohio Dept. of Health, May 2008 LMI 2010 Personal Communication, R. Cantu, Ludlum Measurements, Inc. Sept. 15, 2010.

NASA 2007 NASA Safety and Mission Assurance Directorate, FinalStatus Survey Planfor the Plum Brook ReactorFacility,Revision 1, February 2007.

NASA 2009 NASA Safety and Mission Assurance Directorate Plum Brook Reactor Facility, Technical Basis Document, RadiologicalCharacterizationof Plum Brook Sediments, PBRF-TBD-08-005, Revision 1, March 2009 NASA 2009a NASA Safety and Mission Assurance Directorate Plum Brook Reactor Facility, Technical Basis Document, Revised Dose Assessmentfor Plum Brook Sediments, PBRF-TBD-08-006, Revision 0, March 2009

TBD-10-001 Page 8 of 27, Rev. 0 NJDEP 2010 New Jersey Department of Environmental Protection, Site Remediation Program Sampling Plan Design, Sediment Sampling Plan, http://ni.gov/dep/srp/regs/sediment/02 samp.htm.

ODNR 2006 Ohio Department of Natural Resources and Department of Geology and the Ohio State University, The Ecology of Old Woman Creek, Ohio: An Estuarineand WatershedProfile, 2nd. Ed., 2006.

PNNL 2010 Pacific Northwest National Laboratory, Battelle Memorial Institute, Visual Sample Plan Software, Version 6.0, 2010.

TBE 2010 Teledyne Brown Engineering, Inc. Work Order # L43319, PBOSG - Plum Brook Waters, November 5, 2010.

USNRC 2003 US Nuclear Regulatory Commission, Office of Nuclear Material Safety and Safeguards, ConsolidatedNMSS Decommissioning Guidance, NUREG- 1757, Final Report, September 2003.

USNRC 2009 US Nuclear Regulatory Commission, Request for Additional Information Related to National Aeronautics and Space Administration Amendment Request to License Nos. TR-3 (Docket No. 50-30) and R-93 (Docket No. 50-185) for Plum Brook Reactor Facility, Sandusky, Ohio, Letter from Chad Glenn, Project Manager, Materials Decommissioning Branch to Keith Peecook, Program Manager, Plum Brook Reactor Decommissioning Program, June 11, 2010

TBD-10-001 Page 9 of 27, Rev. 0 5.0 Descriptionof Plum Brook Section 2 The Plum Brook originates in farmland south of the NASA Plum Brook Station and terminates six miles to the north in Sandusky Bay east of the city of Sandusky. An aerial view of the local area with the stream course highlighted is shown in Figure 1.

Figure 1, Aerial View Showing Plum Brook Stream Course 5.1 Stream Sections The portion of Plum Brook impacted by radionuclides of PBRF origin lies between the confluence of Plum Brook with Pentolite Ditch and its terminus in Sandusky Bay. It was divided into four sections for characterization purposes, denoted as Sections 1 through 4.

Section 1, lies between Pentolite Road, in the northern portion of the PBS, and US Rt. 2.

Section 2 extends from US Rt. 2 to about halfway through the Plum Brook Country Club (PBCC). Section 2 is shown in Figure 2. The figure shows where the stream transitions to flood plain in the vicinity of several ponds located in the northern part of the PBCC. The Flood Plain, identified as Section 3, extends from the PBCC ponds to US Rt. 6

TBD-10-001 Page 10 of 27, Rev. 0 (Cleveland Rd.). The section of the stream from US Rt. 6 to Sandusky Bay, the lower flood plain, also identified as the Plum Brook Estuary, is identified as Section 4.

Figure 2, Stream Section 2 - Rt. 2 to Plum Brook Country Club 5.2 Sediment Deposition Characteristics The Plum Brook between Pentolite Ditch and Sandusky Bay is comprised of three hydrologic regimes 2. From Pentolite Ditch through the lower two-thirds of the PBCC golf course, a stream-course distance of about 3.7 mi., it is described as a meandering stream. The stream channel is carved through dense glacial till composed of clay, sand, unconsolidated gravel and soils. The stream channel lies within steep vegetated banks.

The stream escapes the banks only during major floods. From the northern portion of the PBCC to the US Rt. 6 overpass, a stream-course distance of 0.8 mi., the stream environment is classified as floodplain. Here, the stream course tends to be less meandering and the banks much less pronounced than in the meander sections. The stream periodically floods, escaping the banks and the stream width fluctuates accordingly. The stream-mouth estuary extends from US Rt. 6 to the Sandusky Bay shoreline, a distance of about 0.7 mi.

2 The description of Plum Brook sediment deposition characteristics is adapted from a series of reports and presentations prepared by Haag Environmental Company for the NASA Plum Brook Decommissioning Program [Haag 2007, Haag 2008a, Haag 2008b, Haag 2008c].

TBD-10-001 Page 11 of 27, Rev. 0 Sediment enters low-lying surface streams as suspended particulate material eroded from soil in the surrounding watershed during storms. This material is carried to the stream in surface runoff. The sediment is transported downstream by flowing water and is continually deposited from and re-suspended in the water column at rates dependent on the water velocity and sediment and water chemistry. Over time, there is net movement of sediment in the downstream direction, with an accumulation of deposited sediments in the Estuary and the Bay. 3 However, at any given time, sediment deposits are found throughout the stream course. The characteristics of sediment deposits are strongly influenced by the stream hydrologic regime.

In streams such as the Plum Brook, three sediment deposition environments are typically associated with meandering sections. Under normal flow conditions, erosion and suspension of material occurs just upstream of bends and deposition takes place on the downstream side as the velocity slows. The second type of deposition occurs during periods of high flow when the water level rises above the meandering channel but is still confined within the stream banks. Erosion and deposition then occurs along stream banks. There is less of a velocity gradient across the stream than in low flow conditions and deposition tends to occur near obstacles such as debris and trees on the stream banks and behind culverts. A third type of deposition occurs under flood conditions. During major flood events, water levels rise above the banks and inundate surrounding land. At points of flow restriction, such as underpass culverts, backwaters are created which may extend well beyond the stream banks. Sediment deposition occurs on the submerged land surface and especially at and near the "shoreline" as the water recedes. This phenomenon is readily observed as a covering of "mud" and silt on lawns and grassy areas which have been flooded. A cross section view of a meandering stream is shown in Figure 3. It illustrates the three types of deposits characteristic of Plum Brook Section 2.

It has been postulated that most of the contaminated sediments in the Plum Brook were moved downstream from Pentolite Ditch during the major flood event of 1969 [Haag 2007, Haag 2008c]. This event caused significant flooding of adjacent land and many flood backwaters were created along the Plum Brook stream meander sections.

Significant quantities of sediment are received and moved downstream each year by streams such as Plum Brook which pass through agricultural land. Using published erosion rates for the nearby Old Woman Creek watershed, it is estimated that between one hundred and two hundred tons of sediment enter the Plum Brook each year [ODNR 2006].

TBD-10-001 Page 12 of 27, Rev. 0 Figure 3, Deposition Settings in Stream Meander Sections Flood-backwater Deposit Bank Stream Bank Deposit Stream Channel Deposit From the preceding discussion it is seen that sediment is deposited non-uniformly along Plum Brook stream meander sections. Some sediment will be found nearly everywhere within the stream channel and stream banks, if only in thin layers (< 1 cm. in thickness).

Most of the contaminated sediment will reside in discrete deposits of thickness from several cm. up to 10's of cm [NASA 2009].

6.0 Survey Design and Sampling Plan The survey design and sampling plan is developed to supplement previous radiological sampling surveys of the Plum Brook in which only a limited number of sediment samples were collected in Section 2. This information will strengthen the basis for the source term model used in the Brook-side Resident exposure scenario. It will remove the need to use Stream Section 1 characterization results for the exposure scenario located in Section 2. The sampling plan utilizes published guidance and practical experience from other organizations and from previous characterization surveys of the Plum Brook. It includes collection of samples selected on a probability basis to estimate the mean (average) Section 2 Cs-137 concentration. Gamma scan surveys are used to search for areas of elevated activity in stream banks and areas subjected to overbank flooding during past major flood events.

6.1 Data Quality Objectives Objectives of the Plum Brook Section 2 characterization are to:

" Estimate the average sediment Cs-137 concentration (and uncertainty).

• Identify areas of elevated activity that may be present.

4 See for example: New Jersey Site Remediation Program, Field Sampling Procedures Manual, Sediment Sampling Plan [NJDEP 2010].

TBD-10-001 Page 13 of 27, Rev. 0

" Determine if Cs-137 is present in flood back-water deposits.

" Determine if other radionuclides of PBRF origin are present in Section 2 sediments.

6.2 Number of Samples The first objective is addressed by collecting sediment samples for analysis by gamma spectroscopy. Determination of the number of samples needed to estimate the mean sediment concentration in Stream Section 2 is based on a confidence interval calculation using the Student's t-distribution. This method is described in Gilbert, [Gilbert 1987] and is implemented in the Visual Sample Plan (VSP) module: Construct Confidence Interval on Mean [PNNL 2010]. The formula used to calculate the number of samples is shown in Appendix B.

The number of samples required to estimate a confidence interval width of 1 pCi/g about the mean at a confidence level of 95% is determined. From Table 1, it is seen that the standard deviation of Cs- 137 concentration in the Plum Brook stream sections estimated from previous characterization surveys ranges from 0.69 to 2.8. The average standard deviation (weighted by the number of samples analyzed) is 2.4. Using the VSP module, the number of samples was calculated for values of the estimated standard deviation (sigma) ranging from 0.5 to 310. The result of these calculations is shown in Figure 1 of Appendix B. From the figure, it is seen that about 100 samples are required for sigma equal to 2.4. Adding 5% for contingencies (inaccessible sample locations, etc) indicates 105 samples.

The sampling plan is implemented by establishing a survey unit in the shape of a narrow rectangle with x dimension corresponding to the Section 2 stream course distance (6320 ft.) and y dimension corresponding to the nominal bank top to bank top cross section distance (approximately 30 ft.). This sampling design covers the stream bed and the two banks, considered to be three strata of approximately equal surface area. They are represented by three parallel strips centered on the stream course. Hence, the 105 samples are allocated equally among the three strata. This is accomplished by selecting 35 sampling transects and collecting three samples at each: one from the stream bed and one from each bank. Sampling locations are placed on a systematic "grid" with randomly selected start location. The VSP software was used to calculate the grid spacing and establish the random start location. Sample locations are established at the x coordinate of each grid node (the y coordinate is not used). 5 The transect coordinates are shown in Table 2 of Appendix B.

5 The grid patterns created by VSP for the very narrow rectangles used have constant Y coordinates; in effect this places the nodes on a straight line.

TBD-10-001 Page 14 of 27, Rev. 0 6.3 Sampling Aided by Gamma Scan Surveys At each transect, one sampling location was established in the stream bed and one on each bank. Samples were collected at sampling locations to 18 inches depth (or to refusal). Samples were divided into sub-samples (0 to 6, 6 to 12 and 12 to 18 inches) for analysis by gamma spectroscopy. 6 Gamma scans were performed to assist in locating stream bank sample collection points on the transects. Experience has shown that deposits of contaminated sediment in the stream banks are typically found in distinct bands at various elevations above the stream bed.

Gamma scans were performed between transects to identify areas of elevated activity on the stream banks. 7 The survey transects were also extended beyond the stream ravine for gamma scan surveys to search for contaminated sediments deposited beyond the stream banks. Samples of soil/sediment were to be collected at locations where the scan counts indicate elevated activity (> 425 ncpm).

6.4 Evaluation of Flood Backwaters According to a report by Haag Environmental Company (Haag 2007), the entire length of Plum Brook Section 2 has been subjected to overland flooding. Concerns were raised by the NRC, "that, areas of elevated contamination could be created in these areas by flood events" [USNRC 2009]. Whereas the overland scan surveys described in the previous section were performed on the standard transects, it is desired to further investigate land areas adjacent to the Plum Brook focusing on areas subject to flooding.

The sampling plan in Appendix B was supplemented to extend the gamma scan surveys of areas adjacent to the Plum Brook. Locations were selected in Section 2 that are prone to flooding and survey instructions prepared to guide performance of gamma scans on lateral transects extending up to 50 ft. from the stream banks. In this survey, the objective is to determine if Cs- 137 activity levels in the surface soil are "different" from background. In order to implement this objective, gamma scan gross count rates are continuously recorded (logged) during the scans for comparison to local area background count rates. Soil samples are collected at locations where technicians observe scan count rates above the local area background.

6 Additional strata could be established to describe Cs-137 concentration vs. depth. Sample recovery and other sampling errors diminish the expected utility of this approach. Concentration vs. depth is examined as part of the data evaluation.

7 Gamma scans are performed with 2 x 2 in. Nal detectors coupled to a Ludlum Model 2350-1 data logging scaler-ratemeter. The instrument is set up to count in a window corresponding to the Cs-137 (Ba-137) 0.66 Mev Gamma. The investigation action level is set at 425 net counts per minute (ncpm). This corresponds to a surface soil concentration of about 7 pCi/g (depending on the background count rate).

TBD- 10-001 Page 15 of 27, Rev. 0 6.5 Other Radionuclides of PBRF Origin To determine if other radionuclides of PBRF origin are present, selected samples were sent to a vendor laboratory for radiochemical analysis. Samples from four locations were sent to Teledyne Brown Engineering, Inc. Knoxville, TN for gamma spectroscopy analysis and analysis for Sr-90 and 1-129. Samples with the highest Cs-137 concentrations measured by the PBRF on-site counting laboratory were selected. The four samples are identified in Table 4.

Table 4, Samples Sent to Vendor Laboratory Sample Log Sample # Location Sample PBRF Result Sample____Log #Weight (g) Cs-137 (pCi/g)

PB10-03056 SR-259-199 T-1 SM-2 0"-6" 342.9 1.82E+01 PB1O-03065 SR-259-206 T-5/T-6 SM-1 6"-12" 332.9 1.76E+01 PB10-03057 SR-259-200 T-1 SM-2 6"-12" 362.7 1.65E+01 PB1O-03059 SR-259-202 T-1 SM-3 0"-6" 343.6 7.34E+00 7.0 Results This section presents results of the recent characterization survey of Plum Brook Section 2.

Estimates are obtained of the average Cs-137 concentration in Section 2 sediments as a whole and in the stream bed and banks. Behavior of Cs- 137 concentration vs. depth and concentration vs. downstream distance are described. The results of scan surveys to identify areas of elevated activity within the stream banks are presented and elevated activity samples are identified. The investigation of flood backwater areas is described and results presented. The effect of these new results on the previous dose assessments is discussed.

7.1 Survey Modifications Several modifications to the survey were made in response to conditions in the field.

These were primarily changes in transect location because of obstructions or interferences which prevented their placement as specified in the survey design. The changes are identified in Table 5. In addition to the changes in transect locations identified in Table 5, there were instances where the standard sampling protocol could not be followed, that is, samples collected at three locations on each transect (stream bed, east and west banks). As noted in the table, no scans were performed or samples collected from the stream banks in Transect T-1 1 because both banks were lined with densely placed landscaping boulders. No survey activities were conducted on Transect 16 because owner permission was not provided. No samples were collected or scans performed on the west bank at Transect T-17 because deep water and vertical bank prevented safe access. These conditions and extensive vegetation and debris on the stream banks limited

TBD-10-001 Page 16 of 27, Rev. 0 access for performance of scan surveys between transects. Overall, 50% of the Section 2 stream bank area was scanned, however.

Table 5, Field Modifications to Survey Transects Distance from Rt. 2 Modified Transect Specified in Design Distance from Rt. Explanation (ft.) 2 (ft.)

Original location in culvert T-10 1681 1636 beneath Galloway Rd overpass - moved 45 ft.

upstream.

Banks not scanned or T- 11 1860 No change sampled due to densely placed landscaping boulders.

Moved 30 ft. downstream to avoid natural gas line.

T- 16 2755 No change Not surveyed - owner access noprvd.

not provided.

West bank not sampled or T-17 2934 No Change scanned due to deep water and steep bank.

Original location beneath a T-33 5799 5824 foot bridge - moved 25 ft.

downstream.

7.2 Samples Analyzed Three hundred and nineteen samples were collected in Plum Brook stream Section 2.

These were analyzed by gamma spectroscopy by the PBRF on-site counting laboratory.

Thirty five transects were established at specified distances north from the Rt. 2 overpass per the survey design shown in Table 2 of Appendix B. Samples were collected from 33 of the 35 designated transects. Depth samples were collected from the stream bed and from each bank in accordance with survey instructions. The majority of samples, 312 samples, were collected from within the stream banks. These included those collected on the 33 transects plus 17 samples collected as a result of scan survey investigations.

Additionally, 7 samples were collected as part of the investigation of flood backwater areas.

7.3 Estimated Mean Cs-137 Concentration A summary of the sample analysis results is presented in Table 6 (individual sample analysis results are provided in Appendix C). A principal objective of the Section 2 supplemental characterization was to provide a more robust estimate of the mean sediment Cs-137 concentration than was previously available. The average Cs-137

TBD-10-001 Page 17 of 27, Rev. 0 concentration estimated from all samples > MDA (203 samples) is approximately 1 pCi/g (0.96 +/- 2.32 pCi/g). However this estimate is biased high because 17 of the 19 highest activity samples were collected as the result of scan survey investigations. The overall Section 2 average concentration estimated from the 295 samples that were selected under the statistical sampling design is 0.44 +/- 0.35 pCi/g.

8 All samples were < MDA for Co-60. Stream bed and stream bank sample concentrations are also compared in Table 6. The table shows that average concentration in the stream bed is slightly higher than in the stream banks, but the difference is not significant.

Table 6, Cs-137 Concentrations in Stream Bed and Banks Stratum No. of Max Avg. St. Dev. 95% Confidence Interval Samples (1) (pCi/g) (pCi/g) (pCi/g) (pCi/g) (2)

All 312 1.82E+01 9.58E-01 2.32E+00 7.0 E-01 to 1.22E+00 Stream Bed 105 1.82E+01 1.04E+00 2.93E+00 4.80 E-01 to 1.60E+00 E Bank 105 1.76E+01 L.OIE+00 2.43E+00 5.40 E-01 to 1.47E+00 W Bank 102 6.12E+00 8.12E-01 1.11E+00 5.97 E-01 to 1.03E+00 Table 6 Notes:

1. The total number of samples collected is shown. Note that the summary statistics are obtained from sample results that are > MDA. These results are obtained from the samples on the systematic grid transects and the investigational samples.

2. Confidence limits (95%) about the mean are calculated as UCL = Avg. + 1.96 s/'/n, and LCL = Avg. - 1.96 s/ 4 n, where s = Std. Dev. And n = number of samples.

7.4 Concentration versus Depth Concentration vs. depth is examined in the tables which follow. Table 7 shows concentration vs. sample depth for all three strata. Table 7 suggests that the highest concentration is found in the 6 to 12 in. layer. However from examination of Tables 8 and 9, it is seen that only the east bank samples show this effect. The stream bed and west bank show a monotonic decrease in concentration with depth.

Table 7, Cs-137 Concentration vs. Depth Depth No. of Max Avg. St Dev 95% Confidence Interval Samples ) (pCi/g) (pCi/g) (pCi/g) (pCi/g) (2) 0 to 6 in 104 1.82E+01 9.77E-01 2.45E+00 5.07 E-01 to 1.45E+00 6 to 12 in. 104 1.76E+01 1.12E+00 2.92E+00 5.62 E-01 to 1.69E+00 12 to 18 in 104 6.60E+00 7.45E-01 1.08E+00 5.38 E-01 to 9.52E-01 Table 7 Notes:

1. The total number of samples collected is shown. Note that the summary statistics are obtained from sample results that are > MDA.

' The average MDA for Cs-137 was 9.7 +/- 3.5 E-02 and for Co-60, 1.18 +/- 0.22 E-01 pCi/g.

TBD-10-001 Page 18 of 27, Rev. 0

2. Confidence limits (95%) about the mean are calculated as UCL = Avg. + 1.96 s//n, and LCL

= Avg. - 1.96 sNn, where s = St. Dev. And n = number of samples.

Table 8, Cs-137 Concentration vs. Depth in Stream Bed No. of Max Avg. St Dev 95% Confidence Interval Depth Samples (1) (pCi/g) (pCi/g) (pCi/g) (pCi/g) (2) 0 to 6 in. 35 1.82E+01 1.26E+00 3.65E+00 5.59 E-02 to 2.47E+00 6 to 12 in. 35 1.65E+01 1.14E+00 3.24E+00 6.71 E-02 to 2.22E+00 12 to 18 in. 35 4.25E+00 6.45E-01 9.84E-01 3.19 E-01 to 9.71E-01 Table 8 Notes:

1. The total number of samples collected is shown. Note that the summary statistics areobtained from sample results that are > MDA.

2. Confidence limits (95%) about the mean are calculated as UCL = Avg. + 1.96 s//n, and LCL

= Avg. - 1.96 s/xn, where s = St. Dev. And n = number of samples.

Table 9, Cs-137 Concentration vs. Depth in Stream Banks Bank/Depth No. of Max Avg. St Dev 95% Confidence Interval Samples (1) (pCi/g) (pCi/g) (pCi/g) (pCi/g) (2)

East 0 to 6 in. 35 7.07E+00 7.46E-01 1.49E+00 2.53 E-01 to 1.24E+00 East 6 to 12 in. 35 1.76E+O1 1.37E+00 3.78E+00 1.15 E-01 to 2.62E+00 East 12 to 18 in. 35 6.60E+00 9.28E-01 1.40E+00 4.63 E-01 to 1.39E+00 West 0 to 6 in. 34 6.12E+00 8.75E-01 1.28E+00 4.44 E-01 to 1.3 1E+00 West 6 to 12 in. 34 5.20E+00. 8.71E-01 1.21E+00 4.64 E-01 to 1.28E+00 West 12 to 18 in. 34 2.58E+00 6.48E-01 6.80E-01 4.20 E-01 to 8.77E-01 Table 9 Notes:

1. The total number of samples collected is shown. Note that the summary statistics are obtained from sample results that are > MDA.

2. Confidence limits (95%) about the mean are calculated as UCL = Avg. + 1.96 s/in, and LCL =

Avg. - 1.96 s/xn, where s = St. Dev. And n = number of samples.

7.5 Frequency Distribution The differential frequency distribution of 203 samples with detectable Cs-137 activity is shown in Figure 4. It is apparent that this is a highly skewed distribution, with the majority of samples (148) less than 0.5 pCi/g. Only 20 samples are > 2 pCi/g. Ten of these samples are > 4 pCi/g and only 5 are identified as elevated activity (defined here as

> 7 pCi/g). The cumulative frequency distribution is shown in Figure 5.

TBD-10-001 Page 19 of 27, Rev. 0 Figure 4, Differential Frequency Distribution of Cs-137 in Sediment Samples 1000 F I r o 100 eg q

u s 10 ec na ye IIIII 0 .1 t l l l l l l l l I l l ll-l l l ~  ; ]

0.5 2 3.5 5 6.5 8 9.5 11 12.5 14 15.5 17 18.5 20 Concentration (pCi/g)

Figure 5, Cumulative Frequency Distribution - Cs-137 All Samples 210 F 200 r 190 e

q 180 U

e 170 n 160 c

Y 150 140 -

0.5 2 3.5 5 6.5 8 9.5 11 12.5 14 15.5 17 18.5 20 Concentration (pCi/g)

TBD-10-001 Page 20 of 27, Rev. 0 7.6 Frequency of Samples with Elevated Activity The frequency of elevated activity samples from Stream Section 2 is compared to the frequency of elevated activity samples measured in the other stream sections. This is shown in Table 10, an update of Table 2.

Table 10, Update of Table 2 - Frequency of Samples with Elevated Activity Stream Maximum Number of Samples Mean Cs-137 Conc. & Std Dev.

Section Cs-137 Conc. with Activity > 0.5 Of Elevated Activity Samples (pCi/g) DCGLI') (pCi/g) 1 72.4 253 (0.14) 15.4 10.3 2 (2) 18.2 5(0.02) 13.4 5.7 3 14.2 6(0.01) 10.0 2.7 4 20.6 32(0.10) 11.2 3.7 Table 10 Notes:

1. Number in parenthesis is the fraction of samples with activity > 0.5 DCGL.

2. The five samples with activity concentration > 7.0 pCi/g were all investigative samples identified via scan surveys.

7.7 Concentration versus Downstream Distance Concentration vs. downstream distance in Section 2 was evaluated. The results are shown in Figure 5. The average and maximum concentrations of samples collected at each sampling transect are plotted vs. downstream distance (in ft.) from the Rt. 2 over-crossing. The figure shows a clear trend of decreasing concentration with downstream distance. The trend line for average concentration is shown.

Figure 6, Cs-137 Concentration vs. Downstream Distance 1 .00E+02 1.OOE+01 -1 A pci/c 1 .OOE+00 JiL RAa

-Avg

-Max

-Linear (Avg) 1.00E-01 0

V 1000 2000 3000 4000 Distance from Rt. 2 (ft) 5000 6000

TBD-10-001 Page 21 of 27, Rev. 0 7.8 Scan Survey and Investigative Sample Results Scan surveys were performed to:

" establish stream bank sampling locations on the transects,

" identify local areas of elevated activity on stream banks between transects and

• search land adjacent to the Plum Brook to identify areas of contaminated sediment deposition.

Scan surveys were performed on accessible portions of transects within the stream banks and on the unobstructed portions of bank sides between the transects. As described in Section 7.1, fifty per cent of the stream banks surface area was covered by scan surveys.

Scans of 33 transects were performed within the banks to guide sample collection (except for the west bank of transect T- 17 which was inaccessible; no scan or sample collection were performed). Indications of elevated activity were noted, investigative measurements taken and samples collected at six locations. Two of the locations were on transects and four were between transects. Seventeen investigative samples were identified by scan surveys.

Table 11 lists the 17 samples and presents the Cs-137 analysis results. As stated above, most of the samples were located between transects. The highest activity samples are found in the stream bed and on both banks. The Cs-137 activity concentration in these 17 samples ranged from 2.24 to 18.2 pCi/g.

Table 11 also shows the Nal count rates (net cpm from static 60 sec. counts) measured at each location where scan count rates above the action level of 425 ncpm were observed.

Static Nal ncpm values above 425 ncpm are associated with sample concentrations of 2.6 pCi/g or greater. It is noted that the static Nal counts are not strongly correlated to sample Cs-137 concentration due to confounding factors such as poor geometry. None-the-less, the data shows that the scan procedure is conservative - it can reliably identify locations with Cs- 137 activity at or above the investigation threshold of 7 pCi/g or 50% of the Cs-137 DCGL.

TBD-10-001 Page 22 of 27, Rev. 0 Table 11, Samples Collected within Stream Banks Identified by Scan Surveys Sample # Sape#Loain(g)Location (1) Weight Conc. 12) 2a pCi/g) Error (pCi/g) Static ncpmNal(3)

SR-259-211 (4) T4/T-5 SM-1 0"-6" 390.5 2.24E+00 3.08E-01 345 SR-259-258 (5) T27/T-28 E SM-1 "12-18" 361.3 2.25E+00 3.39E-01 SR-259-210 T5/T-6 W SM-2 12"-18" 359.0 2.58E+00 3.52E-01 SR-259-256 ) T27/T28 E SM-1 "0-6" 370.7 2.95E+00 3.60E-01 294 SR-259-201 TI SM-2 12"-18" 438.0 2.97E+00 3.45E-01 SR-259-212 (4) T4/T-5 W SM-1 6"-12" 373.5 3.06E+00 3.83E-01 SR-259-257 (5) T27/T-28 E SM-1 "6-12" 344.3 3.23E+00 3.99E-01 SR-259-204 (6) TI SM-3 12"-18" 338.6 4.25E+00 4.71E-0I SR-259-203 (6) TI SM-3 6"-12" 323.9 4.38E+00 4.83E-01 SR-259-209 T5/T-6 W SM-2 6"-12" 322.1 5.20E+00 5.30E-01 SR-259-208 T5/T-6 W SM-2 0"-6" 353.4 6.12E+00 5.42E-01 565 SR-259-207 T5/T-6 E SM-1 12"-18" 402.9 6.60E+00 5.54E-01 SR-259-205 T5/T-6 E SM-1 0"-6" 333.4 7.07E+00 6.08E-01 491 SR-259-202 (6) Ti SM-3 0"-6" 343.6 7.34E+00 5.96E-01 553 SR-259-200 (7) Ti SM-2 6"-12" 362.7 1.65E+01 9.62E-0I SR-259-206 T-5/T-6 E SM-1 6"-12" 332.9 1.76E+01 1.04E+00 SR-259-199 (7) TI SM-2 0"-6" 342.9 1.82E+01 1.01E+00 534 Table II Notes:

I. Location ID coding of transect number is followed by W for west bank, E, for east bank and no suffix for stream bed.

2. The samples are sorted by activity concentration in ascending order.

3. Static Nal counts are listed for comparison to the 0 to 6 in. sample concentrations only.

4. Samples SR-259-211 and SR-259-212 were located 76 ft. downstream of transect T-5.

5. Samples SR-256, SR-257 and SR-258 were located 50 ft. downstream of transect T-27.

6. Samples SR-259-202, SR-259-203 and SR-259-204 were located 68 ft. upstream of transect T- 1.

7. Samples SR-259-199 and SR-259-200 were located 9 ft. upstream of transect T-1.

Scan surveys of the land areas adjacent to the stream were conducted on each transect to a distance of 30 ft. beyond the banks (in the absence of obstructions). In none of these scan surveys was a detector response observed above the investigation action level (425 ncpm).

7.9 Investigation of Flood Backwater Areas.

The scan survey instructions were modified during the course of the field activities to determine if any detectable Cs-137 activity could be found on land areas adjacent to the Plum Brook in Section 2 in areas prone to overbank flooding. The additional scan surveys were performed on ten transects. Four are located within the Plum Brook Country Club golf course (T-29, T-30, T-31 & T-32) and six are located between Rt. 2 and the PBCC (T-2W, west leg only, T-9, T- 11, T-22, T-23 & T-24). Gross count rates observed during the scan of each transect were recorded and local background count rates

TBD-10-001 Page 23 of 27, Rev. 0 were measured. Table 12 lists the range and average value of logged gross count rates measured on each transect and the local background count rates.

Table 12, Summary of Flood Backwater Area Scan Surveys Number of Scan Scan Scan Local Transect

• Scan Counts Min (3) Max (3) Avg. (3) ABCR (4) (3)(5)

Logged (2) (4) (4)

T-2 W 93 96 184 137.0 124.3 T-9 E 93 139 238 183.5 190.7 T-9 W 93 99 226 176.2 165.3 T-11 E 93 141 251 189.5 186.0 T-11 E QC (6) 94 127 236 174.9 186.0 T-11 W 93 125 264 191.1 189.0 T-11 W QC 93 147 291 206.2 216.3 T-22 E 93 157 283 218.4 216.8 T-22 W 93 105 199 151.7 157.3 T-23 E 93 117 244 172.9 158.3 T-23 W 93 131 256 183.3 204.0 T-24 E 93 147 265 202.8 196.3 T-24 W 93 140 266 198.5 210.7 T-29 E 103 141 265 203.4 198.0 T-29 W 103 124 232 178.8 173.0 T-30 E 103 149 270 199.0 179.7 T-30 W 103 110 230 174.6 168.0 T-31 E 93 145 289 204.7 191.0 T-31 W 93 123 233 182.1 162.7 T-32 E 93 128 256 199.3 203.7 T-32 W 93 115 257 180.0 189.3 Table 12 Notes:

1. Transect locations shown on map in Appendix A.

2. Scan counts are logged with a LMI-2350-1 scaler-ratemeter coupled to a 2 x 2 in.

Nal detector set up to count in an energy window corresponding to the Cs-137 0.66 Mev Gamma energy. The instrument is operated in the recycle count mode to automatically log the count rate on 5 second intervals.

3. Units are counts per minute.

4. The scan minimum, maximum and average count rates are calculated from the logged counts excluding the first three logged counts. This is done because the logged count rates are calculated as weighted running averages of the most recent several counts (the number of counts included in the runningaverage depends on the effective time constant and the count rate) [LMI 2010].

5. ABCR, average background count rates, are obtained in the vicinity of each transect as the average of three 60 second static counts.

6. Background counts not taken for T-1 lE QC scan. The ABCR for T-1 1E scan is assigned.

At first glance, Table 12 suggests that all the transects scanned in Section 2 flood backwater areas contain at least one local area with Cs-137 concentration greater than background. This is evidenced by the maximum recorded scan count rate being greater

TBD-10-001 Page 24 of 27, Rev. 0 than the ABCR in all the transects. However when the variability of background is taken into consideration, this conclusion is revisited. If the maximum scan count rates are compared to the combined background from all transect background counts, a different conclusion is reached. The combined background count rate is 184 +/- 28 cpm (one standard deviation). Comparing the maximum scan count rate to the combined count rate

+ 3, value (approximate 99% confidence level), only three transects have at least one local area above background. These are: T- 11 W, T-30E and T-3 1E. If the comparison is made with the combined background count rate + 2y value (95% confidence level), 10 of 19 transect legs have at least one local area above background. These comparisons do not consider the error in the maximum scan count rate logged values. None-the-less, from the above discussion it is concluded from the logged scan count rate data that at least three transect legs have localized areas which warrant investigation to determine if Cs-137 is present above background concentrations.

To complete this evaluation, empirical results of the scan surveys are presented.

Investigations were performed during the scan surveys when technicians observed count rates on the meter display that were above the local background count rate. Table 13 shows that investigations were performed on seven transect legs. All the samples collected as a result of these investigations were analyzed by gamma spectroscopy by the PBRF on-site laboratory (eight samples were analyzed, including one QA split sample).

Table 13 shows that four of eight samples contain detectable Cs-137, with concentrations ranging from 0.20 to 0.71 pCi/g (all were non-detects for Co-60). The average concentration was 0.42 pCi/g. The present characterization survey did not include evaluation of Cs-137 background in a reference area similar to Plum Brook section 2 flood backwater areas. However, it is likely that the sample concentrations from T-9W, T- 11 W, T-22E and T-22W are above background, if only slightly. It was learned by the technicians that in one of the properties surveyed in this investigation (T- 11), dredge spoils from the Plum Brook were distributed on the surrounding landscape. Thus, it is concluded that few areas remain beyond-the stream banks where Cs-137 bearing sediments were deposited by flood events (detected in 3 of 19 transect legs investigated and only slightly above background levels).

Table 13, Samples and Measurements from Flood Backwater Areas Transect Sample No. Location(2) Cs-137 Conc. Static Count Rate Measurement (1) (pCi/g) (3) ID gcpm (4)

T-2W SR-272-6 1 ft. west < MDA (7.3 E-02) T2W SM5 123 +/- 11 T-9E SR-272-7 2 ft. east < MDA (1.4 E-01) T9ESM6 184 +/- 14 T-9W SR-272-8 2 ft. west 7.07 +/- 1.90 E-01 T9W SM7 174 +/- 13 T-11W SR-272-1 20 ft. west 4.50 +/- 1.32 E-01 T11WSM1 212 +/- 15 T-22E SR-272-2 47 ft. east 3.25 +/- 1.23 E-01 T22ESM2 221 +/- 15 T-23E SR-272-3 44 ft. east < MDA (7.7E-02) T23ESM3 195 +/- 14 T-23E (5) SR-272-4 44 ft. east 1.96 +/- 0.88 E-01 T23ESM3 195 + 14 T-24E SR-272-5 30 ft. east < MDA (8.5 E-02) T24ESM4 236 +/- 15 Table 13 Notes:

1. All samples are surface soil (0 to 6 in.)

TBD-10-001 Page 25 of 27, Rev. 0

2. Sample locations are recorded as the distance from the stream bank top measured along the transect; for example Sample No. SR-272-6 was collected 1 ft. west of the stream west bank top and Sample No. SR-272-7 was collected 2 ft. east of the east bank top.

3. The Cs-137 concentrations are reported as net activity +/- 2-sigma total analytical uncertainty. No other gamma emitters of potential PBRF origin were detected (Co-60, Eu-154). The average MDA for the eight sample counts was 9.06 +/- 2.35 E-02 pCi/g (one standard deviation).

4. Static count rates were measured at each sample location. These were 60 sec counts collected with a 2x2 in. Nal detector coupled to an LMI-2350-1 operated in the Cs-137 window mode. The detector was held at contact with the ground surface. Results are reported as gross cpm (gcpm) +/- one-sigma counting error, estimated as the square root of the total counts.

5. Sample No. SR-272-3 is a QC split sample.

7.10 Other Radionuclides As described in Section 5.5, four samples were sent to a vendor laboratory, Teledyne Brown Engineering (TBE), for radiochemical analysis. The Request for Analysis requested that the samples be analyzed for Sr-90 and by gamma spectroscopy for Cs-137, Co-60, 1-129, Eu-154 and other gamma emitters potentially present in PBRF soil. Sample results from the Teledyne Brown report [TBE 2010] are provided in Appendix D. Table 13 summarizes the results of their analyses and compares Cs-137 sample analysis results with PBRF on-site laboratory results. The Teledyne Brown report does not identify Sr-90 or any other PBRF radionuclides in the Request for Analysis above detection limits.

Concentrations of Cs-137 measured by the PBRF laboratory and Teledyne Brown are in good agreement. 9 Table 14, Vendor Laboratory Sample Results PBRF Vendor Laboratory (1)

Sample ID Cs-137 Cs-137 Co-60 Sr-90 (pCi/g) (pCi/g) (pCi/g) (pCi/g)

SR-259-199 1.82E+01 2.14E+01 ND (3) ND (3)

SR-259-200 1.65E+0l 1.65E+01 ND ND SR-259-202 7.34E+00 7.92E+00 ND SR-259-206 1.76E+01 2.07E+O1 ND _ __ND_ _

Table 14 Notes:

1. The analyses requested were gamma spectroscopy (specifically Cs-137, Co-60, and Eu-154), Sr-90 and 1-129.

2. Co-60 and Sr-90 were reported as "not detected". Also 1-129 was reported as not detected.

3. Minimum detectable activity values reported by TBE for Co-60 were from 4.6 E-02 to 1.2 E-01 and for Sr-90 were from 1.2 E-01 to 2.8 E-01 pCi/g.

9 The initial Cs-137 result reported by TBE for sample No. SR-259-206 showed a significant discrepancy with the PBRF laboratory result. Investigations of both laboratories results were performed - it was determined that the initial TBE result was in error. The PBRF Sample Deviation Report is provided in Appendix D.

TBD- 10-001 Page 26 of 27, Rev. 0 7.11 Dose Assessment Update New estimates of radionuclide concentrations in Plum Brook Section 2 obtained from the recent characterization are used to update the dose assessments for exposure scenarios set in Section 2. Results of the original dose assessments identified as TBD-08-006 and the alternate assessment are summarized in Table 3. Table 15 presents doses calculated for the Brook-side Resident exposure scenario using updated source term concentrations.

The table also compares the revised and original dose results. The table shows that the new source term values result in significant reduction in the calculated doses. The calculated dose for the original TBD-08-006 scenario is reduced from 9.24 E-01 to 3.99 E-01 mrem/y. For the Alternate scenario, the dose is reduced from 1.34 E+00 to 7.04 E-01 mrem/y.

These results confirm that the original dose assessment for Plum Brook Section 2, which used characterization data from Section 1, was conservative. Use of the recent Section 2 characterization data results in reduction of the calculated dose by about a factor of 2.

Table 15, Dose Assessment Results using Updated Source Term Concentrations Source Term Updated Dose (mrem/y)

Sourc TermCs-i137 Conc.

Component (Ci/g) TBD-08-006 TBD-08-006 Alternate Alternate pg Original Revised Original Revised Cont.

(1) Zone layer I 9.80E-01 3.20E-01 2.17E-01 5.44E-01 3.69E-01 Cont.

(2) Zone layer 2 1.12E+00 7.34E-02 3.57E-02 1.92E-01 9.88E-02 Cont.

(3) Zone layer 3 7.50E-01 2.96E-02 1.13E-02 4.96E-02 1.88E-02 Elev.

layer Local 1 (4) Area 1.82E+01 3.57E-01 1.01E-01 2.30E-01 6.50E-02 Elev. Local Area 1.76E+01 1.29E-0l 3.0 1E-02 8.03E-02 1.87E-02 layer 2 (5)

Elev. Local Area layer 3 (6) 6.60E+00 1.53E-02 4.59E-03 8.92E-03 2.67E-03 Contaminated Zone in Garden I 9.46E-01 NA NA 2.30E-01 1.31E-01 Total Dose (+/- one standard 9.24 +/- 4.4 3.99 + 5.69 1.34 +/- 0.68 7.04 +/- 10.2 deviation) => E-01 E-01 E+00 E-01 Table 15 Notes:

1. Average concentration of 0 to 6 in. samples (from Table 7).

2. Average concentration of 6 to 12 in. samples (from Table 7).

3. Average concentration of 12 to 18 in. samples (from Table 7).

4. Maximum concentration from 0 to 6 in. samples (from Table 7).

5. Maximum concentration from 6 to 12 in. samples (from Table 7).

6. Maximum concentration from 12 to 18 in. samples (from Table 7).

7. The concentration of Cs- 137 in the 9 in single layer garden source is calculated as the thickness-weighted average of the three layer concentrations of the main contaminated zone.

TBD-10-001 Page 27 of 27, Rev. 0 7.12 Conclusions Principal conclusions from the recent supplemental characterization of Plum Brook Section 2 are:

• A statistical sampling design was prepared to yield an unbiased estimate of the mean Section 2 sediment activity concentration within specified tolerance limits.

• Mean and maximum concentrations in Section 2 are less than in Section 1.

• Previous dose assessments using exposure scenarios set in Section 2 are conservative - revised dose calculations using the new survey results obtain doses a factor of two lower than doses calculated using Section 1 characterization results

" Concentration of Cs-137 in sediments shows a decreasing trend with downstream distance in Section 2.

• Extensive scan surveys were performed to identify areas of elevated activity.

Areas of elevated activity are infrequent in Section 2 - only three locations (with 5 samples collected) were identified with Cs-137 concentration above the investigation action level of 7 pCi/g.

" Sediments contaminated with Cs-137 are largely confined within the stream ravine - investigation of flood prone adjacent land areas identified only three localized areas with Cs-137 concentrations above background (only slightly above).

• Other radionuclides of PBRF origin, including Sr-90, were not detected in Section 2 sediment samples.

8.0 Appendices Appendix A - Plum Brook Section 2 Survey Transect Map Appendix B - Sampling Plan for Characterization of Plum Brook Section 2 Appendix C - PBRF Laboratory Sample Analysis Results Appendix D - Vendor Laboratory Report (Excerpt)

Plum Brook Reactor Facility Technical Basis Document Supplemental Radiological Characterization of Plum Brook Section 2 PBRF-TBD-10-001 Revision No. 0 Appendix A Plum Brook Section 2 Survey Transect Map

TBD-10-001, Appendix A Page 2 of 2, Rev 0 Plum Brook Section 2 Survey Transect Map A.mc Plum Brook Se*.on 2 - Rt. 2 to Ormoma Low Transect No. DIStac.e opamdonT from Rt 2 Wit) DltWice itt)

T-I 69 NA T-2 248 179 T-3 427 179 T-4 eft 179 T-5 786 179 T-6 9665 179 T-7 1144 179 T-8 1323 179 T-9 1502 179 T-10 (1) 1636 134 T-11 1660 224 T-12 2039 179 T-13 2218 179 T-14 (1) 2437 219 T-15 2576 139 T-1S (2) 2755 179 T-17 2934 179 T-18 3113 179 T-19 3292 179 T-20 3471 179 T-21 3650 179 T-22 3829 179 T-23 4008 179 T-24 4188 179 T-25 4367 179 T-26 4648 179 T-27 4725 179 T-28 4904 179 T-29 5083 179 T-30 5262 179 T-31 5441 179 T-32 5620 179 T-33 (1) 5824 204 T-34 6976 154 T-35 6157 179 T.15 (II Trangt Locao-n Moved (21 Transect Not Surviyud 16055 From Rt. 2 to W. RfW Odloway Rd.

1723' From Rt. 2 to E. RAWGdowwy Rd.

4300' From Rt. 2 to S. RW Hdu Rd.

4340' From Rt. 2 to N. PJW HuN Md.

ItSBRO tAST TYPICALLY3W TO SO' TYPICALLY30' TO60' TRANSECTEXTENSIONS01 FOR$CAN SURVY Of FL.OOD 6ACKWA7CPAREAS 1-2 WN T-24 EAW T'Sl74 ES&W 5W A r-9 T-2905W T.22 I. &W r-3I CtAW T..355W r.32 .AW 9113110 CAACAD DRAWINOS1PBRF OVERALL LAYOUTUP.UM BROOK.DWG ISAM8INI TRANSECT COORDINATES)

Plum Brook Reactor Facility Technical Basis Document Supplemental Radiological Characterization of Plum Brook Section 2 PBRF-TBD-10-001 Revision No. 0 Appendix B Sampling Plan for Characterization of Plum Brook Section 2

TBD- 10-001, Attachment B Page 2 of 13, Rev 0 Table of Contents 1.0 Sum m ary ........................................................................................................................................... 3 2.0 Background ....................................................................................................................................... 4 3.0 Previous Plum Brook Sam pling Results ...................................................................................... 5 4.0 Sam pling Plan .................................................................................................................................. 6 5.0 Im plem entation of Sam pling Plan ............................................................................................... 7 6.0 References ...................................................................................................................................... 10 7.0 Attachment - Investigation of Historic Flood Backwater Areas in Plum Brook Section 2 .............. 11 List of Tables Table 1, Plum Brook Sam pling Sum m ary ...................................................................................................... 5 Table 2, Sampling Transect Coordinates ......................................................................................................... 9 List of Figures Figure 1, N um ber of Sam ples vs. Sigm a ........................................................................................................ 7

TBD-10-001, Attachment B Page 3 of 13, Rev. 0 1.0 Summary A sampling plan has been developed for radiological characterization of Plum Brook stream Section

2. This section of the stream runs from US Rt. 2 to the Plum Brook Country Club. The sampling plan is developed to supplement previous radiological sampling surveys of the Plum Brook in which only a limited number of sediment samples were collected in Section 2. The number of samples required to estimate the mean Section 2 sediment concentration with specified uncertainty is determined.

The sampling plan utilizes published guidance and practical experience from other organizations and previous characterization of the Plum Brook. 1 The sampling design (number of samples) is based on estimating the mean Cs-137 activity concentration within a specified uncertainty of + 0.5 pCi/g.

Thirty five sampling locations are placed on a systematic "grid" with randomly selected starting location. The grid is centered on the stream channel. At each of the systematic locations, a sampling transect is established. Sampling points are established at three locations on each transect: one in the stream bed and one on each bank side of the stream. Sample collection points on the stream banks are selected with the aid of gamma scans to identify "bands" of sediment deposition. Depth samples are collected at each transect sampling point to 18 inches, or to refusal, and divided into sub-samples (0 to 6, 6 to 12 and 12 to 18 inches) for analysis by gamma spectroscopy.

The transects are extended beyond the stream ravine onto the adjacent land areas. Gamma scan surveys are performed on the transect extensions to identify any areas where sediments were deposited by flood events. Samples of soil/sediment will be collected at locations where the scans indicate elevated activity.

1 See for example: New Jersey Site Remediation Program, Sampling Plan Design, Sediment Sampling Plan [NJDEP 2010].

TBD-10-001, Attachment B Page 4 of 13, Rev. 0 2.0 Background Plum Brook Stream Section 2 runs from the US Rt. 2 overpass north to the extension of Greentree Lane in the Plum Brook Country Club (PBCC). In the terminology of surface stream hydrology, this stream section comprises the lower meander section. It is bounded on the south by Section 1, the upper meander section and on the north by the upper flood plain, identified as Section 3. The stream course distance of Section 2 is 6200 feet (1.2 mi.).

In 2009, the NASA PBRF Decommissioning Project performed an assessment of radiation exposure to members of the public who could come in contact with contaminated Plum Brook sediments

[NASA 2009]. The purpose of this assessment was to demonstrate that residual contamination of PBRF origin in the Plum Brook and environs satisfies the same dose criteria that apply to the PBRF site (25 mrem/y and ALARA). Requests from the NRC for additional information (RAI) on the Plum Brook dose assessment included comments that questioned the adequacy of the information available from Section 2 to support the dose assessment [USNRC 2009]. In discussions with the NRC Staff following receipt of NASA responses to the 2009 RAI, NASA has agreed to perform additional radiological characterization of Section 2 sediments.

The NRC comments that directly relate to Section 2 characterization are summarized:

• "Section 2 had a significantly lower number of sample results for Cs-137 as compared with sample results for Cs-137 for other Sections" (Comment No. 11).

• "It is unclear how it is known that the concentrations in this section are less than or equal to the concentrations in Section 1. The areas in Section 2 that were not sampled are significant in size and it is possible that areas of elevated concentration could have been missed" (Basis remarks following Comment No. 11).

• "Staff cannot determine the basis for why activity concentrations from Section 1 sample results would be conservative for Section 2" (Comment No. 12)

Additional issues raised in the RAI were:

• "More information is needed to confirm that Cs-137 and Co-60 are the only radionuclides of PBRF origin present at levels above background in the Plum Brook" (Comment No. 2).

• Concerns were raised that areas of elevated contamination could occur in land areas adjacent to the Plum Brook due to deposition of sediments during flood events (Comment No. 13, and the Basis remarks following the comment).

A primary objective of additional characterization of Plum Brook Section 2 is to provide information to address the NRC Staff concerns. The sampling design for this characterization is presented following a summary of Plum Brook sampling conducted to date.

TBD-10-001, Attachment B Page 5 of 13, Rev. 0 3.0 Previous Plum Brook Sampling Results A summary of previous Plum Brook sampling results is provided in Table 1. The data is obtained from PBRF Technical Basis Document TBD-08-005, Radiological Characterizationof Plum Brook Sediments [NASA 2009a]. The table was prepared to compare Stream Section sampling densities and average Cs-137 concentrations estimated from the available data. As indicated in the NRC RAI and shown in the table, Section 2 is the least-characterized section of the Plum Brook. The Table 1 Notes identify the data sources and explain how average Cs-137 concentrations were obtained. The average Cs-137 concentration is used to calculate doses to individuals exposed to contaminated sediments.

The average (mean) concentration and its variability are key parameters for determining the number of samples in supplemental characterization of Section 2.

Table 1, Plum Brook Sampling Summary Stream No. of No. of Stream Stream Course Sampling Mean Cs-137 Coefficient Section Locations Samples Course Distance (mi.) density Concentration of Variation (1) Sampled (2) Analyzed Distance (ft.) (Loc./mi.) (3) (pCi/g) (4) (CV) (5)

(2) 1(6) 621 1810 8600 1.63 381 1.2 +/-2.8 (7) 2.3 2(s 3 16 6200 1.20 3 0.68 0.69 (9) 1.0 3 (10) 106 525 2375 0.45 236 0.54 +/- 1.33 (11) 2.5 4(12) 64 312 3420 0.65 99 0.59 +/- .1.63 (13) 2.8 Table I Notes:

1. Stream Sections 1 and 2 are described in the text. Section 3 runs from the extension of Greentree Lane in the PBCC to US Rt. 6. Section 4 extends from US Rt. 6 to Sandusky Bay.

2. The number of locations sampled is distinguished from the number of samples as depth samples were collected at most sampling locations.

3. Indicator of sampling density; equal to the No. of Locations Sampled - Stream Course Distance (in mi.).

4. Average concentration +/- one standard deviation.

5. Ratio of Standard Deviation to the mean.

6. No. of samples and locations in Section 1 are from TBD-08-005 Table 3 (all SRs except 21, 22 & 95) and includes all samples and locations from Phases 1, 2 and 3.

7. Obtained as the average of Cs-137 concentrations measured in samples collected from all depths in Section 1 from Phase I (systematic samples), characterization Packages SR-5, 6, 7, -8 and 19 as reported in TBD-08-005, Table 4.

8. No. of samples and locations in Section 2 are from characterization packages SVI-04 and SR-33, as reported TBD-08-005, Section 5.3.

9. Obtained as the average of Cs- 137 concentrations measured in samples collected from all depths in Section 2 (from characterization Packages SVI-04 and SR-33).

10. No. of samples and locations in Section 3 are from SR-41and SR-54, as reported TBD-08-005, Table 10.

11. Obtained as the average of Cs-137 concentrations measured in samples collected from all depths in Section 3 from SR-41 and SR-54.

12. No. of samples and locations in Section 4 are from SR-39, as reported TBD-08-005, Table 12.

13. Obtained as the average of Cs-137 concentrations measured in samples collected from all depths in Section 4 from SR-39.

TBD- 10-001, Attachment B Page 6 of 13, Rev. 0 4.0 Sampling Plan The objectives of the Plum Brook Section 2 characterization are to:

" Estimate the mean sediment Cs-137 concentration (and uncertainty) in Section 2.

" Identify areas of elevated activity that may be present.

• Determine if other radionuclides of PBRF origin are present in Section 2 sediments.

The first objective is addressed by collecting sediment samples for analysis by gamma spectroscopy.

To identify areas of elevated activity on stream banks and on nearby land, gamma scan surveys are performed. To determine if other radionuclides of PBRF origin are present, selected samples will be sent to a vendor laboratory for radiochemical analysis.

Determining the number of samples is an estimation problem (as opposed to a hypothesis testing formulation). The number of samples is based on a confidence interval calculation using the Student's t-distribution. This method is described in Gilbert, [Gilbert 1987] and is implemented in the Visual Sample Plan (VSP) module: ConstructConfidence Interval on Mean [PNNL 2010]. The formula used to calculate the number of samples is:

2 n= tl-a/2dfStotal d

Where:

n is the recommended minimum sample size, Stotal is the estimated standard deviation due to both sampling and analytical variability, a is the maximum acceptable probability that the true mean will not lie in the confidence interval (the confidence level is 1-a),

d is the half-width of the confidence interval, tl-,/zdf is the value of the Student's t-distribution with df=n-1 degrees of freedom such that the proportion of the distribution less than tl-,j2 is 1-a/2.

Because n appears on both sides of the equation (on the right side it appears in the degrees of freedom of the t-statistic), the equation must be solved iteratively; VSP does this automatically using the iteration scheme in Gilbert (pg. 32). 2 To determine the number of samples, the confidence level is set at 95% (a = 0.05) and the confidence interval half-width at 0.5 pCi/g. From Table 1, it is seen that the estimated standard deviation of Cs-137 concentration in the Plum Brook stream sections ranges from 0.69 to 2.8. The average standard deviation (weighted by the number of samples analyzed) is 2.4. Using the VSP module, the number of samples was calculated for values of the estimated standard deviation (sigma) ranging from 0.5 to 3.0. The result of these calculations is shown in Figure 1. From the figure, it is seen that about 100 2 This description of the method for determining the number of samples is adapted from a Visual Sample Plan (VSP) sample design report [PNNL 2010].

TBD-10-001, Attachment B Page 7 of 13, Rev. 0 samples are required for sigma equal to 2.4. Adding 5% for contingencies (inaccessible sample locations, etc) then, indicates 105 samples.

Figure 1, Number of Samples vs. Sigma 5.0 Implementation of Sampling Plan The conceptual site model for the Plum Brook meander sections comprises three sediment deposition environments: the stream bed, stream banks and adjacent land where deposition may have occurred on flood backwater areas [NASA 2009a]. This sampling design covers the stream bed and the two banks, considered to be three strata of approximately equal surface area. They are represented by three parallel strips centered on the stream course. Hence, the 105 samples can be allocated equally among the three strata. This is accomplished by selecting 35 sampling locations and collecting three samples at each: one from the stream bed and one from each bank.

To implement the sampling plan, a survey unit is established in the shape of a narrow rectangle with x dimension corresponding to the Section 2 stream course distance (6320 ft.) and y dimension corresponding to the nominal bank top to bank top cross section distance (approximately 30 ft.).

Sampling locations are placed on a systematic "grid" with randomly selected start location. The VSP software was used to calculate the grid spacing and establish the random start location. Sample locations are established at the x coordinate of each grid node (the y coordinate is not used). 3At each of the 35 systematic locations, a sampling transect is established. Sampling points are established at three locations on each transect: one in the stream bed and one on each bank.

3 The grid patterns created by VSP for the very narrow rectangles used have constant Y coordinates; in effect this places the nodes on a straight line.

TBD-10-001, Attachment B Page 8 of 13, Rev. 0 Gamma scans along the transects are used to assist in locating sample collection points and to identify areas of elevated activity on the stream banks. Experience has shown that deposits of contaminated sediment are typically found in thin bands at various elevations above the stream bed.

Depth samples are collected at each transect sampling point to 18 inches, or to refusal, and divided into sub-samples (0 to 6, 6 to 12 and 12 to 18 inches) for analysis by gamma spectroscopy.4 The sampling transects are extended beyond the stream ravine for performance of gamma scan surveys to identify any areas where contaminated sediments were deposited by flood events. Samples of soil/sediment will be collected at locations where the scan counts indicate elevated activity.

Sampling transect coordinates are shown in Table 2. They are given as distance along the stream course (ft.) from the origin where the Plum Brook emerges from the Rt. 2 overpass culvert.

4 Additional strata could be established to describe Cs-137 concentration vs. depth. Sample recovery and other sampling errors diminish the expected utility of this approach. The sampling design does not attempt to incorporate this degree of stratification. Concentration vs. depth will be examined as part of the data evaluation, however.

TBD- 10-001, Attachment B Page 9 of 13, Rev. 0 Table 2, Sampling Transect Coordinates Area: Plum Brook Section 2 - Rt. 2 to Greentree Lane Distance from Separation Rt 2 (ft) Distance (ft)

T-1 69 NA T-2 248 179 T-3 427 179 T4 606 179 T-5 786 179 T-6 965 179 T-7 1144 179 T-8 1323 179 T-9 1502 179 T-10 1681 179 T-11 1860 179 T-12 2039 179 T-13 2218 179 T-14 2397 179 T-15 2576 179 T-16 2755 179 T-17 2934 179 T-18 3113 179 T-19 3292 179 T-20 3471 179 T-21 3650 179 T-22 3829 179 T-23 4008 179 T-24 4188 179 T-25 4367 179 T-26 4546 179 T-27 4725 179 T-28 4904 179 T-29 5083 179 T-30 5262 179 T-31 5441 179 T-32 5620 179 T-33 5799 179 T-34 5978 179 T-35 6157 179 This plan represents a conservative design; it specifies a number of samples that includes a 5 %

increase above the calculated minimum number. This is to compensate for sampling errors such as sample recovery problems due to conditions in the Plum Brook ravine. These conditions include:

• Interferences to access to the Plum Brook ravine for collection of samples at designated sampling transect locations. These include steep thickly vegetated banks, mud, rocks dead

TBD-10-001, Attachment B Page 10 of 13, Rev. 0 trees and stumps, culverts and concrete overpass structures, outfall pipes, human-generated trash and debris.

" Interferences to sample collection at designated sampling locations in the stream bed include exposed bedrock in some locations and deep water pools at others.

" Sample recovery is impacted by the non-homogeneous sampling matrix; sediment is often mixed with gravel, decaying organic material and small debris.

6.0 References Gilbert 1987 Richard 0. Gilbert, StatisticalMethods for EnvironmentalPollution Monitoring, Van Nostrand Reinhold, New York, 1987.

NASA 2009 NASA Plum Brook Reactor Facility, Technical Basis Document, Revised Dose Assessment for Plum Brook Sediments, PBRF-TBD-08-006, March 19, 2009.

NASA 2009a NASA Plum Brook Reactor Facility, Technical Basis Document, Radiological Characterizationof Plum Brook Sediments, PBRF-TBD-08-005, March 19, 2009.

NJDEP 2010 New Jersey Department of Environmental Protection, Site Remediation Program Sampling Plan Design, Sediment Sampling Plan, http://nj.gov/dep/srp/regs/sediment/02_samp.htm.

PNNL 2001 J. R. Davidson, Pacific Northwest National Laboratory, Verification of the Accuracy of Sample Size Equation Calculationsfor Visual Sample Plan Version 0.9C, PNNL-13434, January 2001 PNNL 2010 Pacific Northwest National Laboratory, Battelle Memorial Institute, Visual Sample Plan Software, Version 6.0, 2010.

USNRC 2009 US Nuclear Regulatory Commission, Requestfor Additional Information Related to NationalAeronautics and Space AdministrationAmendment Request to License Nos.

TR-3 (Docket No. 50-30) and R-93 (Docket No. 50-185) for Plum Brook Reactor Facility,Sandusky, Ohio, Letter from Chad Glenn, Project Manager, Materials Decommissioning Branch'to Keith Peecook, Program Manager, Plum Brook Reactor Decommissioning Program, June 11, 2010

TBD-10-001, Attachment B Page 11 of 13, Rev. 0 7.0 Attachment - Investigation of Historic Flood Backwater Areas in Plum Brook Section 2 DECOMMISSIONING PROJECT OFFICE 6100 Columbus Avenue, Sandusky, OH 44870 Phone: (419)621-3314 Fax: (419) 621-3318 MEMORANDUM 09-Aug-2010 To: Project File From: Bruce Mann

Subject:

Investigation of Historic Flood Backwater Areas in Plum Brook Section 2 This memo is to supplement SR-259, Plum Brook Section 2 Characterization. The goal of the investigation described below is to determine if sediments contaminated with radionuclides of Plum Brook origin can be detected in areas adjacent to the Plum Brook, outside of the stream banks.

Land areas adjacent to Plum Brook that were inundated by major flood events are called flood backwaters. According to a report by Haag Environmental Company (Haag 2007), the entire length of Plum Brook Section 2 has been subjected to overland flooding. Concerns were raised by the NRC, "that areas of elevated contamination could be created in these areas by flood events".

Scan surveys conducted on 35 transects established in SR-259 did not identify any locations outside the stream banks with Cs-137 gamma counts in excess of the 425 ncpm investigation level. This investigation level corresponds to about 7 pCi/g, or 1/2 of the Cs-1 37 DCGL for surface soil published in the PBRF FSS Plan (dependent on the detector background). This supports the conclusion that no areas of elevated activity are present outside the Section 2 stream banks. However, the Plum Brook dose assessment assumed that only low levels of Cs-137 are present in flood backwater areas, with average concentrations on the order of 1 pCi/g.

To determine if "any" Cs-137 deposition can be detected in flood backwater areas in Stream Section 2, perform the following:

1. Identify four to six areas adjacent to the Plum Brook between US Rt 2 and Hull Rd that are likely to have been inundated during past flood events. The most likely candidates are:

a. Areas located upstream of major restrictions, such as overpass culverts, or

b. Low-lying areas adjacent to stream locations where the stream ravine is only a few feet deep.

2. Perform a gamma scan with the same detector setup and scan technique as in SR-259.

Establish a transect perpendicular to the stream course extending from the stream bank for 50 ft. or to the end of the low-lying area.

TBD- 10-001, Attachment B Page 12 of 13, Rev. 0

3. Measure and record the local area average background count rate in the vicinity of each transect.

4. Record the range of gross cpm values observed during the scan of each transect.

5. If the investigation level indicated in SR-259 is exceeded, perform the actions in the SR-259 instructions.

Candidate locations for the scan surveys are:

1. The vicinity of SR-259 Transect T-2.

2. Between Transect T-9 and the Galloway Rd. overcrossing. See Figure 1.

3. Between Transect T-1 1 and Plum Brook Creek Drive in the landscaped lot with the bridge.

See Figure 2.

4. South of Hull Rd. in the vicinity of Transects T-21 though T-24. See Figure 3. If possible establish two transects in this vicinity.

Figure 1, Back Yard Immediately Upstream of Galloway Rd.

TBD-10-001, Attachment B Page 13 of 13, Rev. 0 Figure 2, Residence with Landscaped Creek Bank Just Downstream of Galloway Rd Figure 3, Low-lying Area East of Plum Brook Below Hull Rd.

Plum Brook Reactor Facility Technical Basis Document Supplemental Radiological Characterization of Plum Brook Section 2 PBRF-TBD-10-001 Revision No. 0 Appendix C PBRF Laboratory Sample Analysis Results

TBD-1O-001, Appendix C Page 2 of 13, Rev 0 Contents - List of Tables Table 1, PBRF Laboratory Results for Stream Section 2 Ravine Samples (Cs-137) ................... 3 Table 2, PBRF Laboratory Results for Flood Backwater Investigation Samples (Cs-137) ........................... 11 Table 3, PBRF Laboratory Results for all Section 2 QC Samples (Cs-137) ................................................ 12 ii

TBD-10-001, Appendix C Page 3 of 13, Rev 0 Table 1, PBRF Laboratory Results for, Stream Section 2 Ravine Samples (Cs-137)

Cone. 2a Error MDA Sample # Location Weight (g) pCi/g (pCi/g) (pCi/g)

SR-259-91 TI CNT 0"-6" (SAIC) 443.7 5.87E-01 1.47E-01 TI CNT 12"-18" SR-259-93 (SAIC) 435.9 3.17E-01 I1.09E-01 SR-259-92 TI CNT 6"-12" (SAIC) 367.3 3.49E-0I 1.22E-01 SR-259-85 TI E 0"-6" (SAIC) 393.2 2.55E-01 7.47E-02 SR-259-89 TI E 12"-18" (SAIC) 365.7 2.73E-01 8.73E-02 SR-259-87 TI E 6"-12" (SAIC) 382.7 2.51E-01 8.06E-02 SR-259-94 TI W 0"-6" (SAIC) 369.6 1.75E+00 2.93E-01 SR-259-96 TI W 12"-18" (SAIC) 402.6 4.14E-01 I1.27E-01 SR-259-95 TI W 6"-12" (SAIC) 425.2 9.52E-01 2.07E-01 SR-259-199 TI SM-2 0"-6" 342.9 1.82E+01 1.01E+00 SR-259-201 TI SM-2 12"-18" 438.0 2.97E+00 3.45E-01 SR-259-200 TI SM-2 6"-12" 362.7 1.65E+01 9.62E-0I SR-259-202 TI SM-3 0"-6" 343.6 7.34E+00 5.96E-0I SR-259-204 TI SM-3 12"-18" 338.6 4.25E+00 4.71E-0I SR-259-203 TI SM-3 6"-12" 323.9 4.38E+00 4.83E-01 SR-259-100 T2 CNT 0"-6" (SAIC) 356.0 <MDA <MDA 8.03E-02 T2 CNT 12"-18" SR-259-102 (SAIC) 342.6 <MDA <MDA 8.03E-02 SR-259-101 T2 CNT 6"-12" (SAIC) 352.2 <MDA <MDA 1.16E-01 SR-259-97 T2 E 0"-6" (SAIC) 409.0 <MDA <MDA 1.55E-01 SR-259-99 T2 E 12"-18" (SAIC) 372.4 <MDA <MDA 8.05E-02 SR-259-98 T2 E 6"-12" (SAIC) 395.6 <MDA <MDA 9.64E-02 SR-259-103 T2 W 0"-6" (SAIC) 322.1 <MDA <MDA 8.88E-02 SR-259-105 T2 W 12"-18" (SAIC) 320.1 <MDA <MDA 1.20E-01 SR-259-104 T2 W 6"-12" (SAIC) 346.6 <MDA <MDA 8.65E-02 SR-259-113-T3W. T3 6"-12" 331.1 <MDA <MDA 9.05E-02 SR-259-1 10-T3 T3 CNT 6"-12" 407.4 2.38E-01 9.55E-02 SR-259-109-T3 T3 CNT. 0"- 6" 401.4 4.66E-0I 1.38E-01 SR-259-11 I-T3 T3 CNT. 12"-18" 423.7 <MDA <MDA 1.31E-01 SR-259-106-T3 T3 E. 0"- 6" 378.1 <MDA <MDA 1.OOE-01 SR-259-115-T4 E. T3 E. 0"-6" 323.4 5.37E-01 1.72E-01 SR-259-108-T3 T3 E. 12"- 18" 392.8 <MDA <MDA 7.63E-02 SR-259-107-T3 T3 E. 6"- 12" 373.4 <MDA <MDA 8.03E-02 SR-259-112-T3 T3 W. 0"-6" 437.0 <MDA <MDA 6.30E-02 SR-259-114-T3W T3 W. 12"-18" 396.2 <MDA <MDA .OIE-01 SR-259-122-T4 T4 CNT 6"-12" 446.0 4.65E-01 1.31E-01 SR-259-123-T4 T4 CNT 12"-18" 412.1 3.25E-01 1.24E-01 SR-259-121-T4 T4 CNT. 0"-6" 428.6 3.92E-0I 1.38E-01 SR-259-I 19-T4 T4 E 12"-18" 356.2 6.85E-01 1.78E-01 SR-259-117-T4 E. T4 E. 6"-12" 411.9 4.90E-01 I1.37E-01 3

TBD-10-001, Appendix C Page 4 of 13, Rev 0 Table 1, PBRF Laboratory Results for Stream Section 2 Ravine Samples (Cs-137)

Conc. 2a Error MDA Sample # Location Weight (g) pCi/g (pCi/g) (pCi/g)

SR-259-124-T4 T4 W. 0"-6" 370.3 <MDA <MDA 1.02E-01 SR-259-125-T4 T4 W. 6"-12" 384.7 <MDA <MDA 7.79E-02 SR-259-126-T4 T4 W. 12"-18" 389.9 <MDA <MDA 7.33E-02 SR-259-211 T4/T-5 SM-1 0"-6" 390.5 2.24E+00 3.08E-01 SR-259-213 T4/T-5 SM-1 12"-18" 368.5 1.06E+00 2.14E-01 SR-259-212 T4/T-5 SM-I 6"-12" 373.5 3.06E+00 3.83E-01 SR-259-130-T5 T5 C. 0"-6" 455.6 <MDA <MDA 1.OIE-01 SR-259-132-T5 T5 C. 12"-18" 390.4 <MDA <MDA 1.31E-01 SR-259-13I-T5 T5 C. 6"-12" 400.0 3.35E-0I 1.17E-01 SR-259-127-T5 T5 E. 0"-6" 348.5 <MDA <MDA 8.60E-02 SR-259-129-T5 T5 E. 12"-18" 349.8 <MDA <MDA 8.57E-02 SR-259-128-T5 T5 E. 6"-12" 352.9 <MDA <MDA 8.10E-02 SR-259-133-T5 T5 W. 0"-6" 354.6 5.50E-01 1.60E-01 SR-259-135-T5 T5 W. 12"-18" 346.3 4.58E-01 1.47E-01 SR-259-134-T5 T5 W. 6"-12" 360.3 7.97E-01 1.87E-01 SR-259-205 T5/T-6 SM-I 0"-6" 333.4 7.07E+00 6.08E-01 SR-259-207 T5/T-6 SM-1 12"-18" 402.9 6.60E+00 5.54E-01 SR-259-206 T-5/T-6 SM-1 6"-12" 332.9 1.76E+01 1.04E+00 SR-259-208 T5/T-6 SM-2 0"-6" 353.4 6.12E+00 5.42E-01 SR-259-210 T5/T-6 SM-2 12"-18" 359.0 2.58E+00 3.52E-01 SR-259-209 T5/T-6 SM-2 6"-12" 322.1 5.20E+00 5.30E-01 SR-259-142-T6 T6 C. 0"-6" 401.3 5.37E-01 1.64E-01 SR-259-144-T6 T6 C. 12"-18" 417.5 <MDA <MDA 1.63E-01 SR-259-143-T6 T6 C. 6"-12" 393.1 5.43E-01 1.47E-01 SR-259-136-T6 T6 E. 0"-6" 356.3 <MDA <MDA 1.24E-01 SR-259-140-T6 T6 E.12"-18" 342.3 <MDA <MDA 4.18E-02 SR-259-138-T6 T6 E.6"- 12" 405.4 <MDA <MDA 9.65E-02 SR-259-145-T6 T6 W. 0"-6" 344.2 <MDA <MDA 8.3 1E-02 SR-259-147-T6 T6 W. 12"-18" 388.0 <MDA <MDA 7.37E-02 SR-259-146-T6 T6 W. 6"-12" 348.9 <MDA <MDA 1.57E-01 SR-259-151-T7 T7 C. 0"-6" 422.3 <MDA <MDA 1.03E-01 SR-259-153-T7 T7 C. 12"-18" 405.7 2.49E-0I 9.78E-02 SR-259-152-T7 T7 C. 6"-12" 388.0 <MDA <MDA 1.06E-01 SR-259-148-T7 T7 E. 0"-6" 354.5 <MDA <MDA 8.45E-02 SR-259-150-T7 T7 E. 12"-18" 365.5 4.34E-01 1.39E-01 SR-259-149-T7 T7 E. 6"-12" 316.6 5.15E-01 1.59E-01 SR-259-154-T7 T7 W. 0"-6" 312.9 2.40E-01 7.93E-02 SR-259-164 T8 C. 6"-12" 331.7 <MDA <MDA 8.29E-02 SR-259-163 T8 C. 0"-6" 392.9 <MDA <MDA 7.28E-02 SR-259-165 T8 C. 12"-18" 383.9 <MDA <MDA 7.45E-02 SR-259-157 T8 E 0"-6" 340.2 <MDA <MDA 9.24E-02 SR-259-159 T8 E 6"-12" 320.3 <MDA <MDA 1.15E-01 SR-259-161 T8 E. 12"-18" 313.2 <MDA <MDA 9.13E-02 SR-259-166 T8 W. 0"-6" 314.4 9.97E-01 2.19E-01 SR-259-168 T8 W. 12"-18" 341.8 2.86E-01 9.03E-02 SR-259-156-T7 T8 W. 12"-18" 329.3 <MDA <MDA 9.1OE-02

TBD-10-001, Appendix C Page 5 of 13, Rev 0 Table 1, PBRF Laboratory Results for Stream Section 2 Ravine Samples (Cs-137)

Conc. 2a Error MDA Sample # Location Weight (g) pCi/g (pCi/g) (pCi/g)

SR-259-155-T7 T8 W. 6"-12" 311.2 <MDA <MDA 9.19E-02 SR-259-167 T8 W. 6"-12" 333.8 9.32E-01 2.23E-01 SR-259-172 T9 C. 0"-6" 389.3 4.60E-01 1.33E-01 SR-259-174 T9 C. 12"-18" 388.6 <MDA <MDA 7.7 1E-02 SR-259-173 T9 C. 6"-12" 450.1 3.69E-01 1.22E-01 SR-259-169 T9 E. 0"-6" 389.2 <MDA <MDA 7.70E-02 SR-259-171 T9 E. 12"-18" 314.7 <MDA <MDA 6.67E-02 SR-259-170 T9 E. 6"-12" 351.0 <MDA <MDA 8.15E-02 SR-259-175 T9 W. 0"-6" 331.0 4.29E-01 1.39E-01 SR-259-177 T9 W. 12"-18" 323.6 4.74E-01 1.67E-01 SR-259-176 T9 W. 6"-12" 314.2 5.69E-01 1.22E-01 SR-259-178 T1O E. 0"-6" 393.5 3.25E-01 1.14E-01 SR-259-182 TIO E. 12"-18" 331.5 7.49E-01 1.88E-01 SR-259-180 T10 E. 6"-12" 361.7 5.58E-01 1'55E-01 SR-259-184 T10-C 0"-6" 400.0 6.56E-01 1.82E-01 SR-259-186 T10-C 12"-18" 337.0 4.72E-01 1.48E-01 SR-259-185 T10-C 6"-12" 381.2 5.33E-01 1.52E-01 SR-259-187 T1O-W 0"-6" 379.2 <MDA <MDA 7.90E-02 SR-259-189 TIO-W 12"-18" 336.2 3.63E-01 1.33E-01 SR-259-188 T1O-W 6"-12" 402.7 2.89E-01 1.06E-01 SR-259-79 T12 CNT 0"-6" (SAIC) 360.9 <MDA <MDA 7.62E-02 T12 CNT 12"-18" SR-259-81 (SAIC) 348.4 <MDA <MDA 8.21E-02 T12 CNT 6"-12" SR-259-80 (SAIC) 335.3 <MDA <MDA 8.94E-02 SR-259-76 T12 E 0"-6" (SAIC) 378.6 2.99E-01 1.25E-01 SR-259-78 T12 E 12"-18" (SAIC) 436.1 4.27E-01 1.24E-01 SR-259-77 T12 E 6"-12" (SAIC) 419.7 4.17E-01 1.28E-01 SR-259-82 T12 W 0"-6" (SAIC) 386.9 <MDA <MDA 7.1 1E-02 SR-259-84 T12 W 12"-18" (SAIC) 397.7 <MDA <MDA 7.19E-02 SR-259-83 T12 W 6"-12" (SAIC) 372.4 <MDA <MDA 8.05E-02 SR-259-193 T13 C 0"-6" 385.6 3.12E-01 1.12E-01 SR-259-195 T13 C 12"-18" 381.1 <MDA <MDA 7.50E-02 SR-259-194 T13 C 6"-12" 378.6 <MDA <MDA 7.92E-02 SR-259-190 T13 E 0"-6" 349.2 3.96E-01 1.36E-01 SR-259-192 T13 E 12"-18" 352.2 5.66E-01 1.62E-01 SR-259-191 T13 E 6"-12" 391.6 4.74E-01 1.14E-01 SR-259-196 T13 W 0"-6" 379.6 <MDA <MDA 9.97E-02 SR-259-198 T13 W 12"-18" 391.3 <MDA <MDA 7.31E-02 SR-259-197 T13 W 6"-12" 377.1 <MDA <MDA 7.59E-02 SR-259-262 T14 C "0-6" 454.7 <MDA <MDA 6.59E-02 SR-259-264 T14 C "12-18" 429.1 <MDA <MDA 6.41E-02 SR-259-263 T14 C "6-12" 409.5 <MDA <MDA 6.99E-02 SR-259-259 T14 E "0-6" 409.5 <MDA <MDA 7.32E-02 SR-259-261 T14 E "12-18" 434.5 <MDA <MDA 6.33E-02 SR-259-260 T14 E "6-12" 388.7 <MDA <MDA 7.36E-02

TBD-10-001, Appendix C Page 6 of 13, Rev 0 Table 1, PBRF Laboratory Results for Stream Section 2 Ravine Samples (Cs-137)

Conc. 2aY Error MDA Sample # Location Weight (g) pCi/g (pCi/g) (pCi/g)

SR-259-265 T14 W "0-6" 401.5 3.04E-01 1.11E-01 SR-259-267 T14 W "12-18" 449.1 3.41E-01 1.07E-01 SR-259-266 T14 W "6-12" 459.3 3.30E-01 1.06E-01 SR-259-274 T15 C "0-6" 439.2 <MDA <MDA 8.61E-02 SR-259-276 T15 C "12-18" 426.9 <MDA <MDA 7.02E-02 SR-259-275 TI5 C "6-12" 423.0 <MDA <MDA 6.76E-02 SR-259-268 T15 E "0-6" 324.4 3.39E-01 1.31E-01 SR-259-272 T15 E "12-18" 312.7 1.56E+00 2.82E-01 SR-259-270 T15 E "6-12" 341.9 4.44E-01 1.O1E-01 SR-259-277 T15 W "0-6" 403.9 <MDA <MDA 7.08E-02 SR-259-279 T15 W "12-18" 406.8 <MDA <MDA 7.03E-02 SR-259-278 TI5 W "6-12" 400.0 <MDA <MDA 7.49E-02 SR-259-73 T17 CNT 0"-6" (SAIC) 441.7 3.04E-01 1.02E-01 T17 CNT 12"-18" SR-259-75 (SAIC) 423.5 2.98E-01 1.07E-01 T17 CNT 6"-12".

SR-259-74 (SAIC) 410.1 4.19E-01 1.24E-01 SR-259-70 T17 E 0"-6" (SAIC) 330.1 7.47E-01 1.85E-01 SR-259-72 T17 E 12"-18" (SAIC) 319.4 1.53E+00 2.22E-01 SR-259-71 T17 E 6"-12" (SAIC) 317.2 1.19E+00 2.39E-01 SR-259-64 T18 CNT 0"-6" (SAIC) 409.0 3.56E-01 1.14E-01 T18 CNT 12"-18" SR-259-66 (SAIC) 387.9 3.72E-01 1.32E-01 T18 CNT 6"-12" SR-259-65 (SAIC) 374.6 5.43E-01 1.54E-01 SR-259-61 T18 E 0"-6" (SAIC) 386.1 3.79E-01 1.27E-01 SR-259-63 T18 E 12"-18" (SAIC) 412.0 3.55E-01 1.19E-01 SR-259-62 T18 E 6"-12" (SAIC) 378.7 4.54E-01 1.34E-01 SR-259-67 T18 W 0"-6" (SAIC) 355.5 4.02E-01 1.56E-01 SR-259-69 T18 W 12"-18" (SAIC) 324.4 3.51 E-01 9.43E-02 SR-259-68 T18 W 6"-12" (SAIC) 343.0 3.59E-01 1.25E-01 SR-259-55 T19 CNT 0"-6" (SAIC) 431.6 1.90E-01 8.13E-02 T19 CNT 12"-18" SR-259-57 (SAIC) 415.2 2.52E-01 9.54E-02 T19 CNT 6"-12" SR-259-56 (SAIC) 430.7 2.94E-01 1.23E-01 SR-259-52 T19 E 0"-6" (SAIC) 380.0 <MDA <MDA 9.01E-02 SR-259-54 T19 E 12"-18" (SAIC) 362.7 <MDA <MDA 8.27E-02 SR-259-53 T19 E 6"-12" (SAIC) 378.7 <MDA <MDA 7.27E-02 SR-259-58 T19 W 0"-6" (SAIC) 339.5 2.64E-01 1.08E-01 SR-259-60 T19 W 12"-18" (SAIC) 327.7 <MDA <MDA 8.40E-02 SR-259-59 T19 W 6"-12" (SAIC) 329.5 <MDA <MDA 1.62E-01 SR-259-46 T20 CNT 0"-6" (SAIC) 453.5 2.69E-01 9.85E-02 T20 CNT 12"-18" SR-259-48 (SAIC) 403.8 3.02E-01 1.11E-01 SR-259-47 T20 CNT 6"-12" 421.6 1.95E-01 8.32E-02

TBD-10-001, Appendix C Page 7 of 13, Rev 0 Table 1, PBRF Laboratory Results for Stream Section 2 Ravine Samples (Cs-137)

Conc. 2a Error MDA Sample # Location Weight (g) pCi/g (pCi/g) (pCi/g)

(SAIC)

SR-259-43 T20 E 0"-6" (SAIC) 373.8 <MDA <MDA 7.36E-02 SR-259-45 T20 E 12"-18" (SAIC) 416.6 <MDA <MDA 6.61E-02 SR-259-44 T20 E 6"-12" (SAIC) 387.0 <MDA <MDA 8.50E-02 SR-259-49 T20 W 0"-6" (SAIC) 323.2 3.70E-01 1.31E-01 SR-259-51 T20 W 12"-18" (SAIC) 388.5 2.69E-01 1.02E-01 SR-259-50 T20 W 6"-12" (SAIC) 356.7 3.65E-01 1.29E-01 SR-259-37 T21 CNT 0"-6" (SAIC) 412.1 1.65E-01 7.20E-02 T21 CNT 12"-18" SR-259-39 (SAIC) 408.7 1.92E-01 7.44E-02 T21 CNT 6"-12" SR-259-38 (SAIC) 443.5 2.27E-01 8.94E-02 SR-259-31 T21 E 0"-6" (SAIC) 351.4 2.34E-01 7.OOE-02 SR-259-35 T21 E 12"-18" (SAIC) 351.1 1.99E-01 7.OOE-02 SR-259-33 T21 E 6"-12" (SAIC) 341.4 1.64E-01 5.18E-02 SR-259-40 T21 W 0"-6" (SAIC) 330.8 2.11 E-01 9.97E-02 SR-259-42 T21 W 12"-18" (SAIC) 369.9 <MDA <MDA 7.73E-02 SR-259-41 T21 W 6"-12" (SAIC) 400.8 9.58E-02 4.80E-02 SR-259-25 T22 CNT 0"-6" (SAIC) 387.8 3.50E-01 1.19E-01 T22 CNT 12"-18" SR-259-27 (SAIC) 424.6 4.66E-01 1.31E-01 T22 CNT 6"-12" SR-259-26 (SAIC) 402.6 5.56E-01 1.51E-01 SR-259-22 T22 E 0"-6" (SAIC) 414.6 <MDA <MDA 2.09E-01 SR-259-24 122 E 12"-18" (SAIC) 355.2 4.92E-01 1.51E-01 SR-259-23 T22 E 6"-12" (SAIC) 368.8 1.89E-01 8.94E-02 SR-259-28 T22 W 0"-6" (SAIC) 364.2 3.91E-01 1.33E-01 SR-259-30 T22 W 12"-18" (SAIC) 361.0 <MDA <MDA 1.29E-01 SR-259-29 T22 W 6"-12" (SAIC) 357.7 2.84E-01 1.32E-01 SR-259-16 T23 CNT 0"-6" (SAIC) 444.2 2.66E-01 9.88E-02 T23 CNT 12"-18" SR-259-18 (SAIC) 366.0 2.80E-01 1.34E-01 T23 CNT 6"-12" SR-259-17 (SAIC) 444.4 2.75E-01 7.87E-02 SR-259-10 T23 E 0"-6" (SAIC) 438.4 2.57E-01 8.04E-02 SR-259-14 T23 E 12"-18" (SAIC) 412.3 4.23E-01 1.27E-01 SR-259-12 T23 E 6"-12" (SAIC) 462.1 3.24E-01 8.79E-02 SR-259-19 T23 W 0"-6" (SAIC) 370.9 4.60E-01 1.39E-01 SR-259-21 T23 W 12"-18" (SAIC) 328.9 <MDA <MDA 1.IOE-01 SR-259-20 T23 W 6"-12" (SAIC) 330.4 2.71E-01 1.16E-01 SR-259-4 T24 CNT 0"-6" (SAIC) 449.0 2.20E-01 9.37E-02 T24 CNT 12"-18" SR-259-6 (SAIC) 392.6 2.17E-01 9.29E-02 T24 CNT 6"-12" SR-259-5 (SAIC) 463.3 3.72E-01 1.27E-01 SR-259-1 T24 E 0"-6" (SAIC) 349.2 <MDA <MDA 8.58E-02

TBD-10-001, Appendix C Page 8 of 13, Rev 0 Table 1, PBRF Laboratory Results for Stream Section 2 Ravine Samples (Cs-137)

Conc. 2a Error MDA Sample # Location Weight (g) pCi/g (pCi/g) (pCi/g)

SR-259-3 T24 E 12"-18" (SAIC) 376.5 <MDA <MDA 1.06E-01 SR-259-2 T24 E 6"-12" (SAIC) 328.0 2.11E-01 8.81E-02 SR-259-7 T24 W 0"-6" (SAIC) 372.6 6.77E-01 1.73E-01 SR-259-9 T24 W 12"-18" (SAIC) 381.4 2.1OE+00 3.04E-01 SR-259-8 T24 W 6"-12" (SAIC) 345.4 1.11E+00 2.26E-01 SR-259-217 T25 C "0-6" 427.0 2.86E-01 1.05E-01 SR-259-219 T25 C "12-18" 405.8 5.24E-01 1.40E-01 SR-259-218 T25 C "6-12" 418.4 2.97E-01 1.05E-01 SR-259-214 T25 E "0-6" 328.6 3.22E-01 1.27E-01 SR-259-216 T25 E "12-18" 319.9 <MDA <MDA 8.60E-02 SR-259-215 T25 E "6-12" 370.7 <MDA <MDA 7.72E-02 SR-259-220 T25 W "0-6" 385.0 2.55E+00 3.35E-01 SR-259-224 T25 W "12-18" 319.9 8.88E-01 1.74E-01 SR-259-222 T25 W "6-12" 354.1 2.43E+00 3.26E-01 SR-259-229 T26 C "0-6" 322.3 3.03E-01 1.24E-01 SR-259-231 T26 C "12-18" 437.2 4.56E-01 1.31E-01 SR-259-230 T26 C "6-12" 370.2 3.91E-01 1.55E-01 SR-259-226 T26 E "0-6" 360.8 2.71E-01 1.11E-01 SR-259-228 T26 E "12-18" 381.4 3.73E-01 1.46E-01 SR-259-227 T26 E "6-12" 342.0 3.21E-01 1.24E-01 SR-259-232 T26 W "0-6" 330.1 3.88E-01 1.35E-01 SR-259-234 T26 W "12-18" 343.9 2.60E-01 1.08E-01 SR-259-233 T26 W "6-12" 323.7 4.02E-01 1.43E-01 SR-259-238 T27 C "0-6" 371.1 3.56E-01 1.22E-01 SR-259-240 T27 C "12-18" 418.8 <MDA <MDA 8.36E-02 SR-259-239 T27 C "6-12" 360.7 <MDA <MDA 1.36E-01 SR-259-235 T27 E "0-6" 380.9 2.46E-01 1.03E-01 SR-259-237 T27 E "12-18" 370.6 <MDA <MDA 8.09E-02 SR-259-236 T27 E "6-12" 339.8 <MDA <MDA 1.37E-01 SR-259-241 T27 W "0-6" 317.5 4.87E-01 1.58E-01 SR-259-243 T27 W "12-18" 321.4 <MDA <MDA 1.28E-01 SR-259-242 T-27 W "6-12" 363.3 3.42E-01 1.21E-01 SR-259-256 T27/T28 SM-1 "0-6" 370.7 2.95E+00 3.60E-01 SR-259-258 T27/T-28 SM-1 "12-18" 361.3 2.25E+00 3.39E-01 SR-259-257 T27/T-28 SM-1 "6-12" 344.3 3.23E+00 3.99E-01 SR-259-250 T28 C "0-6" 425.9 2.69E-01 1.13E-01 SR-259-252 T28 C "12-18" 400.9 3.68E-01 1.20E-01 SR-259-251 T28 C "6-12" 432.5 3.29E-01 1.12E-01 SR-259-246 T28 E "6-12" 328.4 8.5 1E-0I 2.02E-01 SR-259-244 T28 E "0-6" 389.7 5.68E-01 1.51E-01 SR-259-248 T28 E "12-18" 325.9 1.O1E+00 2.21E-01 SR-259-253 T28 W "0-6" 349.6 <MDA <MDA 1.78E-01 SR-259-255 T28 W "12-18" 386.3 <MDA <MDA 7.76E-02 SR-259-254 T28 W "6-12" 371.8 <MDA <MDA 7.69E-02 SR-259-286 T29 C 0-6 416.5 3.05E-01 1.05E-01 SR-259-288 T29 C 12-18 371.6 2.71E-01 1.07E-01

TBD-10-001, Appendix C Page 9 of 13, Rev 0 Table 1, PBRF Laboratory Results for Stream Section 2 Ravine Samples (Cs-137)

Conc. 2a Error MDA Sample # Location Weight (g) pCi/g (pCi/g) (pCi/g)

SR-259-287 T29 C 6-12 378.7 3.65E-01 1.26E-01 SR-259-280 T29 E 0-6 341.1 2.85E-01 1.12E-01 SR-259-284 T29 E 12-18 363.1 3.36E-01 1.23E-01 SR-259-282 T29 E 6-12 364.4 <MDA <MDA 1.19E-01 SR-259-289 T29 W 0-6 320.6 3.61E-01 1.30E-01 SR-259-291 T29 W 12-18 328.0 4.14E-01 1.40E-01 SR-259-290 T29 W 6-12 333.6 2.44E-01 1.09E-01 SR-259-295 T30 C 0-6 405.2 3.4 1E-01 1.12E-01 SR-259-297 T30 C 12-18 411.0 3.40E-01 1.14E-01 SR-259-296 T30 C 6-12 386.4 2.11E-01 9.43E-02 SR-259-292 T30 E 0-6 347.4 3.12E-01 1.16E-01 SR-259-294 T30 E 12-18 355.3 3.93E-01 1.31E-01 SR-259-293 T30 E 6-12 330.8 2.95E-01 1.21E-01 SR-259-298 T30 W 0-6 362.6 2.68E-01 1.05E-01 SR-259-300 T30 W 12-18 381.1 <MDA <MDA 1.20E-01 SR-259-299 T30 W 6-12 384.8 2.33E-01 9.93E-02 SR-259-307 T31 C 0-6 433.7 2.07E-01 8.45E-02 SR-259-309 T31 C 12-18 408.0 3.04E-01 1.08E-01 SR-259-308 T31 C 6-12 452.5 2.97E-01 1.04E-01 SR-259-301 T31 E 0-6 317.0 3.53E-01 1.29E-01 SR-259-305 T31 E 12-18 385.8 <MDA <MDA 9.70E-02 SR-259-303 T31 E 6-12 392.9 1.88E-01 8.62E-02 SR-259-310 T31 W 0-6 329.2 4.65E-01 1.78E-01 SR-259-312 T31 W 12-18 318.8 <MDA <MDA 8.97E-02 SR-259-311 T31 W6-12 351.4 <MDA <MDA 1.14E-01 SR-259-316 T32 C 0-6 328.2 <MDA <MDA 1.28E-01 SR-259-318 T32 C 12-18 367.9 <MDA <MDA 1.O0E-01 SR-259-317 T32 C 6-12 380.9 1.71E-01 8.55E-02 SR-259-313 T32 E 0-6 333.1 2.80E-01 1.12E-01 SR-259-315 T32 E 12-18 340.0 <MDA <MDA 2.69E-01 SR-259-314 T32 E 6-12 347.1 <MDA <MDA 2.52E-01 SR-259-319 T32 W 0-6 348.3 2.75E-01 1.24E-01 SR-259-321 T32 W 12-18 332.2 2.80E-01 1.15E-01 SR-259-320 T32 W 6-12 318.8 3.19E-01 1.28E-01 SR-259-328 T33 C 0-6 428.3 4.85E-01 1.46E-01 SR-259-330 T33 C 12-18 419.1 6.39E-01 1.55E-01 SR-259-329 T33 C 6-12 405.4 7.12E-01 1.70E-01 SR-259-322 T33 E 0-6 346.9 2.47E-01 1.03E-01 SR-259-326 T33 E 12-18 403.0 2.61E-01 1.16E-01 SR-259-324 T33 E 6-12 403.4 3.37E-01 1.14E-01 SR-259-331 T33 W 0-6 351.0 2.87E-01 1.11E-01 SR-259-333 T33 W 12-18 353.0 2.20E-01 9.85E-02 SR-259-332 T33 W 6-12 373.7 <MDA <MDA 1.1OE-01 SR-259-337 T34 C 0-6 423.1 2.38E-01 9.19E-02 SR-259-339 T34 C 12-18 441.9 <MDA <MDA 8.63E-02 SR-259-338 T34 C 6-12 437.0 <MDA <MDA 6.86E-02

TBD-10-001, Appendix C Page 10 of 13, Rev 0 Table 1, PBRF Laboratory Results for Stream Section 2 Ravine Samples (Cs-137)

Conc. 2cr Error MDA Sample # Location Weight (g) pCi/g (pCi/g) (pCi/g)

SR-259-334 T34 E 0-6 353.2 1.80E-01 8.73E-02 SR-259-336 T34 E 12-18 360.1 2.48E-01 1.04E-01 SR-259-335 T34 E 6-12 373.4 1.96E-01 9.25E-02 SR-259-340 T34 W 0-6 316.6 <MDA <MDA 1.13E-01 SR-259-342 T34 W 12-18 340.4 <MDA <MDA 8.40E-02 SR-259-341 T34 W 6-12 316.2 3.60E-01 1.36E-01 SR-259-349 T35 C 0-6 432.3 2.68E-01 9.64E-02 SR-259-351 T35 C 12-18 463.7 3.43E-01 1.08E-01 SR-259-350 T35 C 6-12 414.8 2.55E-01 1.00E-01 SR-259-343 T35 E 0-6 367.2 2.95E-01 1.1OE-01 SR-259-347 T35 E 12-18 346.7 3.17E-01 1.22E-01 SR-259-345 T35 E 6-12 348.2 <MDA <MDA 1.46E-01 SR-259-352 T35 W 0-6 329.3 5.10E-01 1.53E-01 SR-259-354 T35 W 12-18 339.5 2.63E-01 1.1OE-01 SR-259-353 T35 W 6-12 327.6 2.23E-01 1.05E-01 Number 312 203 203 109 Max 463.7 1.82E+01 1.04E+00 2.69E-01 Avg 375.0 9.58E-01 1.65E-01 9.66E-02 SD 38.53 2.32E+00 1.40E-01 3.52E-02

TBD-10-001, Appendix C Page 11 of 13, Rev 0 Table 2, PBRF Laboratory Results for Flood Backwater Investigation Samples (Cs-137)

Conc. 2cy Error MDA Sample # Location Weight (g) pCi/g (pCi/g) (pCi/g)

SR-272-1 T-11 W. SM-i 0"-6" 390.0 4.50E-01 1.32EL01 7.05E-02 SR-272-2 T-22 E. SM-2 0"-6" 350.3 3.25E-01 1.23E-01 8.55E-02 SR-272-3 T-23 E. SM-3 0"-6" 373.7 <MDA <MDA 7.65E-02 SR-272-4 T-23E QC SM-3 0"-6" 380.9 1.96E-01 8.78E-02 7.22E-02 SR-272-5 T-24 E. SM-4 0"-6" 351.5 <MDA <MDA 8.53E-02 SR-272-6 T-2 E. SM-5 0"-6" 389.1 <MDA <MDA 7.35E-02 SR-272-7 T-9 E. SM-6 0"-6" 367.3 <MDA <MDA 1.37E-01 SR-272-8 T-9 W. SM-7 0"-6" 321.9 7.07E-01 1.90E-01 9.3 1E-02

TBD-10-001, Appendix C Page 12 of 13, Rev 0 Table 3, PBRF Laboratory Results for all Section 2 QC Samples (Cs-137)

Conc. 2cr Error MDA Sample # Location Weight (g) pCi/g (pCi/g) (pCi/g)

SR-259-86 TI E QC 0"-6" (SAIC) 391 2.OOE-01 7.1OE-02 SR-259-88 TI E QC 6"-12" (SAIC) 395.1 1.47E-01 5.86E-02 SR-259-90 TI E QC 12"-18" (SAIC) 370.3 9.33E-02 4.58E-02 SR-259-116-T4 E QC. 0"-6" 346.2 7.05E-01 1.83E-01 SR-259-118-T4 E. QC 6"-12" 375.1 6.97E-0I 1.68E-01 SR-259-120-T4 120 T4 E. QC 12"-18" 403.1 6.93E-01 1.64E-01 SR-259-137-T6 E. 0"-6" QC 360.7 <MDA <MDA 1.11E-01 SR-259-139-T6 E. 6"-12" QC 393.2 <MDA <MDA 5.75E-02 SR-259-141-T6 E.12"-18" QC 351.3 2.26E-01 7.10E-02 SR-259-158 T8 E QC 0"-6" 338.4 <MDA <MDA 1.07E-01 SR-259-160 T8 E QC 6"-12" 322.2 <MDA <MDA 8.54E-02 SR-259-162 T8 E QC 12"-18" 382.1 <MDA <MDA 0.090857 SR-259-179 T1O E. QC 0"-6" 421.8 <MDA <MDA 6.78E-02 SR-259-181 TIO E. QC 6"-12" 337.1 7.37E-01 1.85E-01 SR-259-183 TIO E. QC 12"-18" 332.6 3.95E-01 1.60E-01 SR-259-269 T-15 E QC "0-6" 386.7 4.52E-01 1.35E-01 SR-259-271 T-15 E QC "6-12" 433.9 2.73E-01 8.42E-02 SR-259-272 T-15 E "12-18" 312.7 1.54E+00 2.74E-01 SR-259-273 T-15 E QC "12-18" 368.6 1.39E+00 2.55E-01 SR-259-15 T 23 E 12"-18" QC SAIC) 445.1 2.85E-01 5.69E-02 SR-259-32 T 21 E 0"-6" QC (SAIC) 332.9 2.05E-01 7.93E-02 SR-259-34 T 21 E 6"-12" QC (SAIC) 343.9 2.09E-01 6.89E-02 SR-259-36 T 21 E 12"-18" QC SAIC) 355.1 1.73E-01 6.23E-02 SR-259-11 T 23 E 0"-6" QC (SAIC) 439.9 3.14E-01 1.08E-01 SR-259-13 T 23 E 6"-12" QC (SAIC) 441.9 4.34E-01 8.48E-02 SR-259-221 T-25 W QC "0-6" 344.2 2.23E+00 3.23E-01 SR-259-223 T-25 W QC "6-12" 385.4 2.39E+00 3.23E-01 SR-259-225 T-25 W QC "12-18" 349.8 9.29E-01 2.01E-01 SR-259-245 T28 E QC "0-6" 346.5 5.30E-01 1.42E-01 SR-259-245 T28 E QC "0-6" 346.5 4.98E-01 1.31E-01 SR-259-247 T28 E QC "6-12" 316.7 8.33E-01 2.03E-01 SR-259-249 T28 E QC "12-18" 353.2 8.29E-01 1.97E-01 SR-259-281 T-29 E QC 0-6 340.7 2.98E-01 1.20E-01 SR-259-283 T-29 E QC 6-12 367.2 2.64E-01 1.04E-01 SR-259-285 T-29 E QC 12-18 395.4 2.85E-01 1.06E-01 SR-259-302 T-31 E QC 0-6 360.2 3.05E-01 1.18E-01 SR-259-304 T-31 E QC 6-12 405.1 <MDA <MDA 7.14E-02 SR-259-306 T-31 E QC 12-18 397.7 2.63E-01 1.02E-01 SR-259-325 T-33 E QC 6-12 400.7 3.46E-01 1.29E-01 SR-259-327 T-33 E QC 12-18 388.8 2.44E-01 1.15E-01 SR-259-344 T-35 E QC 0-6 349.2 2.91E-01 1.17E-01 SR-259-346 T-35 E QC 6-12 372.2 2.21E-01 1.08E-01 SR-259-348 T-35 E QC 12-18 360.5 2.14E-01 7.86E-02 SR-272-4 T-23E QC SM-3 0"-6" 380.9 1.96E-01 8.78E-02 7.22E-02

TBD- 10-001, Appendix C Page 13 of 13, Rev 0 Table 3, PBRF Laboratory Results for all Section 2 QC Samples (Cs-137)

Conc. 2a Error MDA Sample # Location Weight (g) pCi/g (pCi/g) (pCi/g)

Number 44 37 37 7 Max 445.1 2.39E+00 3.23E-01 1.11E-01 Avg 371.4 5.50E-01 1.36E-01 8.43E-02 SD 33.74 5.38E-01 7.1OE-02 2.OOE-02

Plum Brook Reactor Facility Technical Basis Document Supplemental Radiological Characterization of Plum Brook Section 2 PBRF-TBD-10-001 Revision No. 0 Appendix D Vendor Laboratory Report (Excerpt - Sample Results)

TBD-10-001, Appendix D Page 2 of 14 CONTENTS Teledyne Brown Engineering Report, Work Order # L43319 Excerpt ....................................... 3 PBRF Sample Deviation Report, SDR-1o0-003 ................................................................ 13

TBD-10-001, Appendix D Page 3 of 14 AMP TELEDYNE BROWN ENGINEERING, INC.

ATuodyno Tnbhnol*uu Company 2508 Quali'y Lame KnoxvMe, TN 37931-3133 865-90-6819 Work Order #: L43319 PBOSG - Plum Brook waters November 5, 2010

TBD-1O-O01, Appendix D Page 4 of 14 Table of Contents Analytical Results ......................................................................................................... 6 QC Results .................................................................... . ......................................... 11 Sample Receipt ............................................................................................................ 16 Internal Chain of Custody ............................................................................................. 18 Gam ma Spectroscopy .................................................................................................. 22 Strontium ....................................................................................................................... 135 Iodine 129 ..................................................................................................................... 185 Percent Moisture .......................................................................................................... 246

TBD-10-001, Appendix D Page 5 of 14 1 Nov.

L43319 F P Ij~~E4,2010 A,4l TELE)YNE

'W BRO WN ENGINEERING, INCM ATdmWMTbdu~w CoWv 250 Qualiy Law Knavi*i TW 37931-3133 Kbn Koestzer Empirical Laboratories 621 Maltsbeam. Drive Suite 270 Nashville TN 37228 Case Narrative - L43319 PLOO1-3EREG-08 11/04/2010 14:11 Sample Receipt The following samples were received on August 17,2010 in good cofditon, unless oterwise noted.

Cross Reference Table Client ED Laboratory Staton D(if applicable)

SR-259-199 L43319-1 SR-259-200 ILA3319-2 SR-259-202 L43319-3 SR-259-206 L43319-4 Sanw-le Analysi lustrimet used for all analyses were in cah'bration.

Standard solutions used in. analyses were National Institute of Standards and Technology (NIST) traceable.

Analyb al Method Cossý eferemce Table Radiological Parameter TBE Knoxville Method Reference Method Gamma Sp TBE-2007 EPA 901.1 1-129 TBE-2012 SM7500-1 C SR-90 TBE-2019 EPA 905.0 Cu~eNardiif 1 of 3

TBD-10-001, Appendix D Page 6 of 14 Nov. 4, 2010 W BROWN ENGINEERING, INC.

ATuWe*.bctmlqimsCoqw noxvlMlc6 TN 37931-3133 Cane Narmtive - L43319 PLO01-3EREG-08 11/04/2010 14:11 S alonsiderations Cee T1U duplicate failed on the original Sr-90 Work Group. All Sr-90 samples were remrun All QC results for the rer work group wore acceptable.

Revision 1:

1-129 was not scheduled at receipt. The 1-129 was listed under the gamma nuclides, but it cannot be reported fro. a gamma scan.

Afer the problem was discovered, the client was notified and the 1-129 analysis was scheduled.

Revision 2:

The gamma scan for sample L43319-4 was processed with an incorret efficiency file, The data has been repressed and the report is being reissued Qualty Control Quality control samples were analyzed as W010412.

Duplicates were analyzed for the following samples. All duplicate results were within acceptance limits, unless otherwise noted.

(20U~ Laboram oc saw=ke#

SR-259-199 IA3319-1 WG10412-1 BI-214-F Quality Control Quality control samples were analyzed as W010632.

All blanks were within acceptance limits, unless otherwise noted.

Labomtor Control Samnle All laboratory control samples were within acceptance limits, unless otherwise noted.

Laboratory Control &amples dulicates All laboratory control samples duplicate results were within acceptance limits, unless othemwse noted.

CM Nwratiw 2 of 3

TBD-10-001, Appendix D Page 7 of 14 L4331 9 RI paan XPED Nov. 49 2010 ANJ TEL.EIYNE 4 W BROWN ENGINERING, INC.

ATdsdk4uitglsCmqzu 2SO Qlty Lane Knoxvlle TN 37931-3133 Case Narrative -L43319 PL001-3EREG-08 11/04V2010 14:11 Quality Control Quality control samples were analyzed as WGI0448,WGI0529.

Method Blk All blacnk were within acceptance limits, unless otherwise noted.

LWbcM&M Control baple Ali laboratory control samples were within acceptance limits, unless othewise noted.

Duplicates were analyzed for the following samples. All duplicate results were within acceptance limits, unless othewise noted.

CMLaboratory I OC Snmtk #

EAST WALL, TURBINE 882 IA3178-lR1 W010529-3 This is to certify that Teledyne Brown Engineering - Environmental Services, located at 2508 Quality Lane, Knoxville, Tennessee, 37931, has analyzed, tested and docomented samples as specified in the applicable purchase order.

Thi also certfies thatrequirements of applicable codes, standards and specifications have been fidly met sad OWaney quality assurance documenta~tion which verified conformance to the purchase order is on file and may be examined upon request Ih erc f t the ye stateents erue and correct.

Keith Jeter Operations Manager-COWNendive 3 of 3

TBD-10-001, Appendix D Page 8 of 14 L43319 RI Page 8 of 249 ANALYTICAL RESULTS

TBD-1O-O01, Appendix D Page 9 of 14 Report of Analysis PagTELEoYNE 11105110 806 11105110 08.'ll ABROWNr*,-ho

• r *.,r INC.

ENGINEERING, L43319 Emphia Labesories REVISED Kim Kostzer PL00I-3EREG-08 Nov. 4, 2010 Sample ID: SR-259-199 CollectSut 07/20201007:15 Matrh Soil (S)

Station Collect Stop Vohun.

Description:

Receive Da: 08/17/2010  % Mobisth 1.45 LIMB Numbs. IA3319-1 Rad501ieS Come 2 Sigma MDC Unft 0 Volume Units Date Daa TIM Ug F Valum 4-129 1 2012 I -1.82E-02 I 1.71B-"1 MU76M-el pC1/gly ID 10.0092 gdry 107/201007:15 1 10/11/10 1200 1 Sec IU I iNo I R-90 2018 I 9.131-02I 1.35E-01 2.151I p(W/gDy IlRl -7.0417 gdry 1072o10o07:15 109/29/10 15 I M I UI I kG-108M I2007 -2.M-02E 9.20E-02 1A14-l I pCi/Dry 1 329.68 I gdry_ 107/20/1007:15 109/03/101 3600 1 Sec I UI I No

-40 1 2007 I 1.69+.1l 1.88E+00 [6.6*E-l I pCi/gDy I i 329.68 I gd&Y 107/20/1007:15 109/031101 3600 1 Sec; I+ IYesI I2007 I 1.201,-l 6.80E-02 I902 2 I pCi/gDrny I 329.63 I gdry 107/20/1007:15 I 09/03/1ol 3600 I Sac I+I IYel 94 I 2007 1 2.701-02 I 4.49E-02 17-9K-02 I p gDry I I 329.68 1 gd&y 107/0/1007:15 109/03/10 3600 I Sec I ul I Nol 137  ! 2007 2 2.14Z+ 1 5.03E-01 I 120"-1 I p~gDry I I 329.68 I gd y 107/2/O107:!15 109/03/101 3600 1 Sec I+ I Yes1 152 I 2007 fF205E-0I 2.52E-01 14.27M-Cl I paiS/g y 1 I 329.68 I g dy 107/20/1007:15 109/03/10 3600 I Sac Iu I Nol U-154 2007 -4.11E-02 1.55E11-01 2A4C1 pC/giy 1 1 329.63 I gdry 107=2O1007:15 1o09W101/ 3600 1 Sec I ul I Nol 208 1 2007 M 844K-C1 I 4.4611-01 [ 3.33F,-01 1 pCUgDvy I _ 329.68 1 g dy 107/20/1007:15 1090/10 3600 ISa I+ I. Yes1 B-212 12007 T 8. 01 1.7111-01 12.17&-01 1 pC/gDt'y I 1 329.68 1 gdfy 07/20/1007:15 109103/101 3600 1 Sec I+ I IYesI 1-214 12007 I2.29Z00 I2.8111-01 12.10E1-01 1 pCL/g Dy T1 329.68 I gdry 107/20M1007:15 109/03/10o 3600 SeI I+1 IYes1 B-214 207 1 2.om+0K 2.913-01 12M-1 pCi/gD .I 1I 3296 I gdry 107=1o007:15 109/03/10 3600 1 Sec I+1 IYes I 2007 l.419.001 2.18511+00 2-226 2.67E-+00! p(IWgm, 1 I 329.6 8 dry 07/20/10 07:15 1 09/03/101 3600 1 Sec I+ I IYes I C-22 12007 I 9.11K-o I 3.5013-01 13.231_-01 I plgDiy I I 329. I gart 107/20/1007:15 109/03/1d 3600 Sec I+ I Yesi 2007 I &%F4.01 I 4.24101 20-228 15.50B1 I pCitgDry I 329.68 I gdif 107/20/1007:15 I 093/101 360 1 Sec I+1

+IYe 207 M2281 57 1.71"1.- 12.17"1-01 pigIDy 1 329.68 I gd y 107/20/0 07:15 109/03/101 36001 Se I+1 _ Yes1

-232 I 2007 I &98"l i3.44-01 13.18E&01 I pCI/gDry I I 329.68 g dry 107/20/1007:15 1 09103/10 3600 7 Sec I+1 I YCS 1

-23 2007 I -3.77E-01 I 4.58,-01 7.0K,.01 I pCi/gDy I 329. I gd'y 107/20/1007:15 109/03/101 3600 1 Sec U I INol I--

u - Cbo oYAzdywmnotd etd (IDC) mloema-, 3 sima No -Peaknotidootifled IgnfliammSpcttUU

+ = Actvi ommeemaimon womb MDC and3 slmn; peak id only) at Yes -PeaIumapenun o2.

U* = CompowWmAndiv nmtdd .e& Pee.k nt ItiafiedL butfA dareivditycancemsutiamem eds MDC and 3 s** 4-UtMosso.mwi. w a .n.zd l, rmsfm spe d Hirm Ativity cocntuim m acsibe cwrutlnvsmeu Ir.~~~~~~m

• U= ns*t only to ,vme w=a=eriVvki erdd the sapstedin the emoadten thy Spec M- C eNXeub aummr wdmihw specifcatim L - Low mcovay H = Hin*M MDC - Mbmim Detctable Coecagmrag Beled text Indets reportable Pae of 4

TBD-10-001, Appendix D Page 10 of 14 Report of Analysis TLDN 1110511086l 11/0510 0.-06Ar*mm'mdmT6*bswC BROWN ENGINEERING, 5 INC.

IA3319 E*mpial LAbomtoroe REVISED Kim Kostor PL,001-3BREG-08 Nov. 4,2010 Sample i a.-259-200 CollecSt a07/20201007-25 Matwi: Soil (S)

Station: Collect Stopr. Volume:

Receive Dat: 08/17/2010 %Moisture: 1.24 IXMS Numbw. IA3319-2 Radioanuide Sop O

Acur Come rUncerinl 2 Sigma

1. MDMDC Uskt #

-vjAqtIi Alilquat Volume Usit Refwerem Date Da t11 Time Countcon Units Fbg Values

-129 2012 -2.02-M I 1.57E-01 2.521-01 I pCifgDry I10.0212 1gdy 0/10 0725 1 10/1/101 1200 Sec I ul I No I

-90 I 2018 I .OOE+001 1.36E-0A I 2.77-01 I pCi/gDry RI 7.0158 1 dry 107/20100725 109129101 15 I M I UI I I O-OSM 12007 I-2.83-02 7.78F-02 1.229-1 I pCi/g Dry I 330.6 I gdy 17/20/m00725 I o0m311l 36oo I see IU I I NoI

-40 I 2007 1.67Z401 I 1.70E+00 I 5.68*1- I pCISgry I I 330.6 1 gdt 107/20/100725 1 09/03/101 360 I Sec I+ I Yel I 2007 I -6 E-02 I 5.64-02 I 1.20]-01 I pCi/gIDry I 1 330.6 I g diy 107/20,1007:25 I 0903/101 3600 I Sec I I No I 20940207I-1.44E-02 3.59E-02 SIr.o pClfgz I 330.6 I gdry 107/2=10o0705 09/03/101 36001 Se I -U7 IN- I 137 I 2007 I.6,+01 4.14E-01 I 7.94E-02 I pCi/gDry I I 330.6 I gdry 107I20l1007-5 109/03/101 3600 1 Sa I+ I ysI,,

-152 12007 I-1.7411-01 2130 I 324,-01 1 pCi/g Dry 1 I 330.6 I g&y 1070/10 07:509/03101 3600 I Se UII INol

-154 12007 I-4.17E-02 LooI 1.60-01 I pCUgDMy I I 330.6 1 gdry 107/20/1007.25 109AWIO1 3600 1 Se I UI INo 203 12007 19.760-01 2.73F101 12.41E.01 I pCi/gDry I I 330.6 1 gdey 07/20/1007:25 [09/03/101 3600 1 Sec I+ I IYes 1 1-212 12007 I 8.16,-01 1.541Mo1I 1.92&-01 1 pCi/gly 1 1 330.6 1 gd*y 107/20/0070 109/03/101 36Mo I Sac +I _I I Yes I

-214 I2007 I 2.39+eel 2.6711-01 1.5601 I pC/gDry I 330.6 I gdy 107/20/1007:25 1 09/03/101 3600 I Sec I+1 IYesI 214 12007 1 1.964e00 2.41E-01 12.41 1 pCilgDiy 1 330.6 1 gdty 107/20/1007025 09/03/1or 3600 1 sec I+ I I Ys 1207 20-226I 96E,0 2-34E+00 ] ..28E+00 I pCi/gDry I 1 330.6 1 g dy 107/20/t007:25 I 9/03/101 3600 1 Sec I +T I Yes 12007 0228 I 7236Cl 1_.91-o 1.47E-01 I pCi/glM JI I 330.6 I gdry 107AWIO 07:25 109103/101 3600 I Sac I+ I IlYCl

-228 I 2007 I 6.30-01 I 4.3113-01 4.31E-01 I pCigDry I [ 330.6 1 gdry 107/20=1007:25 I 09/03/101 3600 T Sec I+ I IYesI

-228 1 2007 1 8.164-01 I 1.53&-01 [1.92E4w pCi/gDry I I 330.6 1 gdry 107V20/1007:25 1 09/03/101 3600 I Sec I +el .....

-232 I 2007 I 7.2S.1 2.9411-01 T1.45E-01 pCi/gi I 330.6 I gdy 107/20/1007:25 109/03/101 3600! Sem I+ l y Il 235 1 2007 22.72E-01 i 4.08E-01 &6971-0II pl/gD*wy I 330.6 g dry 107f20n1007 25 109/03/101 3600 I Sm I UI I No I fta Vdma U = CompoaWuAn*ytenot dtected (46DC) or bw l 3sl'igme, No - Pk ad idenetifhingamm g nqstcdu

+ - Atvityo umcwmr e eceet MDC ead3 sigma; peak iftdlml only) Yes =Pa mdtd la Smmspeck=

1t - CortpmdAnlte not deted. Peak not ideaffied buta Cdsub3 fpofaed **** Unless otmwise nututthe anslyccl H110 -

= Md mte. npm*t "e mMDcm elted only to the sampes tsted in the omdwiltm ldey L - Low mcovey ue ewdbytbslab H = High nWmy MC - M*nim Deectdaa Caweafttrgla Blded teat Imdleates rqrtabl value. P 2of4

TBD-10-001, Appendix D Page 11 of 14 Report of Analysis 11/5/00:0 i MpME BROWN ENGINEERING, INC.

1 1/05/10 08:06 Ak* mmma Aidd bMThftWC.-,a IA3319 R mhn I, abormts REVISED Kim Koetw, PLOOI-3sRE.-08 Nov. 4,2010 Sample ID: D R-29-20 CollctStart 07/20201008:00 Matrix: Soil (S)

Stdkato Collect Stop: Volua.

Desariplion: ReceiveDate: 08/17t2010 %Moistr 1.56 LIMS Number. IA3319-3 Actiit e Iidutn Ran_ __ Aliuo _ __ _ _ _

Radlenudide SOP# cone 2 Sig MDW 1 U21t1 # Volume Unt Datee Bob To IUntbs Flog Value

[-129 2012 -5.101-02 l.80E-01 2.81-.011 pCi/gDry 10.0147 dry dt 07/20/100.-00 1 10/11/10 1200 1 See jU INo R-90 T2018 I 3.68-02 I 136W01 I2.571-l I pCi/UDZY I R I1 7.1502 1 gdry 107/20/1008:00 1 0929/101 15 1 M I UI11 to-loaM 12007 I 3.771-02l 7.16M-02 I 1.19t-g01e1 pCt/gIky II 306.23 1 gd&y 107/20/1008:00 109/03/101 3600 1 Sec IU I No

-4 I 2007 I1 01! 1.83E+040 &.15&-01 I pCilDry I I 306.23 I g*dry 107/20100.00 109/03/101 3600 I S I+ I lyel

__.,60__ _2007 1.05E-01 7.06]&M-2 i s.751-02 1 pCI'gDty II 306.23 I gdry i07n0i008:00 109103/101 3600 I sea Iu I Yes1 94 I 2007 I 1.311-02 5.15B-02 I .79-42 I pCi/gy 1 I 306.23 1 gdry 107t"1008:00 1091031101 3600 1 Sec IU I Not 11-137 1 2007 07.92E+I0 3.02B-01 1.24B41 pC(i/gDMy _ 1 306.23 1 gdry 107/20/1008:00 109/03/101 3600 I See I+ I yes

__-152__ 2ooM -1.6,- I___,-0 _._-__0&0___ , I 1 306.23 I gs 107/20/1008.00109/03/101 36*0 I Sec ul Ial

-154 I 2007 I -7.74E-02 1.73 1 -I 2.62&-01 I My 306.23 1 g dry 107I2011008:00 109/03/101 3600 1 Sec I-IU I No!

208 I 2007 I 6.90-41 3.45*-01 I 3.32E-01 I pCi/g . I I 306.23 I gdry 10720/1008:00 109/W/1l0 3600 I sec - + I IYes B-212 I 2007 I 9.181..01 I 1.69101 12.12-01 I pCig.Dry I i 306.23 1 gdry 107120/100.-00 109/03/101 3600 I Sec I + Yesl 1-214 i2007 3.94194001 3.10_-01 I 2.031-01 I pCi/SDzy I 1 30.23 1 gdry 10710/10oMOO 109/03/101 3600 1 Sec I + I Yvesl B-214 1 2007 I 3.04,+00 2.81F,-01 2.6 I pCi/gDry I I 306.23 I gdy I0720/1008:00 109/03/10 3M I See I+ I Yes I 228 I 2W07 I 7.. -o01 3.671-01 [3.30B.01 I pCi/g Dry - 1 306.23 I gdry 107/20/10 0800 109/03/101 3600 I Sec I+ I I Yes

-2s I 2007 I 9.181&01 1.69&01 I 2.121-01 I pCitg My I I 306.23 I gdry 107/' o008:00 1 0910301 3600 1 SI I+ I IYesl

-232 1 2007 1 7.71G-0 l 3.61E-01 I3.261-01 I p~lgDry I 30623 I gdry 107r01008-* 109/03/101 3600 secI +I IYes I

-235 2o07 I-1.1513-02 5.70E-01 19.05 I pCi/g I I 306.23 I gdry 107120/100000 109/03/101 3600 1 Sec I UI I Nol Flog Vito.

U - sii~a~

Ceepoend/,Amilte not ddotmd (-ODC o a t3 eece(r4J)e te n sigma No -l eak nt ieifuli utnaqz mspe 4

+ = Actit coccutulnion eaveus MDX and 3 u*ptg apk* iitified(ipmma oy) Xm- Pe* ldandQDto pun. spedna 9.

uO = CMounAnmoahnot 0-Ia Pe* notMideinified, buti d ed salinity c a=md MDC mnd 3 dgma zcentions Yes - B Hub - Activtydconremtrataxecdo csm Mwt value3*-* 4 a~edwi Unless nof MedyiU Emults ted Spec - MdDC moceeds owdoma techmilcal ftiecficabon ar tandad oM mpe en nd odto a L - low recoverywemdWb cb H - H'no reesly hA- Miiu Dacd AOM1110 Bolded text Inicleate Mprbe esali e. Page3

TBD-10-001, Appendix D Page 12 of 14 Report of Repor of0A Analysis al y s TEEDNEn BROWN ENGINEERING. INC.

!11/05/10 08:06 ATn.i~~n L,43319 R EVISED Enipirhic Labontories REVISED Kim Koetre' PL0O1-3EREG-O8 Nov. 4,2010 Sample ID: SR-2.52,6 Collect Stiat 074W20100&130 MarLix: Soil (S)

Stalon: Collect Stop: Volume:

Descdpfmi: ReceiveDate: 03/1712010 %M .ishzro 1.07 LIMS Number L43319-4 lRoaudide OPSo# dW [U~~ty Come 2 8igm MDC ~ 0Us A~quot AkivlquT Volumm IUnits av Datb I al CoostI

_rime tOM Units__ Values

-129 I 1.718-01

2012 -. A-135B..1 pigDry 431-01 I 10.0036 1 gdry 107m10 08

30 1 10/11/101 1200 Sec I U I_ _Nol 12018 2R-90 1.34"-o1 I i.58E-0o 12.371-01 1 pC./gDry I RIl 7.0726 I gdry 107M2o/008-30 10929/n0[ 15 1 M ul I I 0O-08M 12007 T1-1.72-02 I 1.OIE-0Z 1 1 01 pCi/gDly I Rtl 290.9 1 gDry 107=20/1 0&30 109/03/10 3600 1 Se IV No

-40 I 2007 I1.6414011 2001+00 I 6.3*-01 p0g1ry I R1 I 290.9 I g Dry 107120/7=0803o 109,03/101 3600 I Soc I+ lYesl y

__ __o_ I 2007 I 1.62-01 I 7.13&M2 I L.47&,01 1 pM&gMry I R1l 290.9 1 em 7 107=/0o030 1 09/OyI01 3600 I sec IU*IN I l 94 I 2007 I-e.76-2*- 4.80E-02 17AJ-o2 I pCI/gDry Ia 290.9 1 gDry 107/2/1008:30 109/03/101 3600 I Sec [IUI Nol 137 I 2007 2.0719+01 5.13B-01 I 1.24E-01 I pci/gDry I RI 290.9 1 gDry 107=20/1008-30 I09/03/10! I U-152 1 2007 1 5.35&-02 1 2.718,01 I 4.410 I yCV'gDry I Ri I 290.9 I gI*, 07/20/100=36 r 0 09/03/101 36M0 I Sec 3600 I S I+

iU Ic 1

Yes ioI

-154 12007 I-8.531-021 1.73B-01 I2.591-01 1 pC_gDry Ri1l 290.9 1 g Dy 107/20/100:30 109/031101 36oo1 Sec Iu I No 208 1 2007 1 6-%]&. 1 4.323-0 1 3.808-01 1 pCgDry I R1 I 290.9 T zy J M07120/9006:30 109/03/101 3600 I See + I Yes I B-212 1 2007 7.82..01 I 1.73E-01 I 2.19&-01 I pCi/gDry R1l 1 290.9 1 gDy 1072/=1008:30 109103/101 3600 1 Sec I + I IYesl 1-2e4 1 2007 F1.701-00 I 2.80B-01 2.414-01 i pCi/gIy I RS 1 290.9 1 gDry 107/20/1008:30 09103/101 3600 1 Sec 1+ I IYesl B-214 I 2007 11.54U-00lI 3.14",01 [3.191-01 1 pigDi, 1 1 290.9 1 gDry 107/20/100930 1090M3/1 3600 1 Sec I+l IYesI 2-M4 I5900 1451+00 12.49E+00 12oo7 1 pCi0gD9 RI.R1 290.9 1 gDry_ 107=/2000:30 109103/101 36001 c I +-I yes Il C-228 I 2007 I 9.291o1 I 3.76W-01 I 3.16E.01 I pC/VD1y I R1 I 290.9 1 9Dry 107=201008:30 109)03/101 3600 I Se I'- I yesl 228 2007 I 7, 01 I 1.731-01 I 2.19E-01 I p gDiY IR1 I 290.9 I gEy 107 O/1008.*30 1009/03/10. 3600 1 Se I+ I Iyesl

-232 2007 I 9,164,1 1 3.70&-01 1 3.118-1 pCitgDry I RI I 290.9 1 gDry 107120/08o30 109/03/101 3600 I Sec I+ I IYesI

-235 I 2007 I -2.868..02 4.89E-01 I ZIF,1-' I p~Ci/S1 , I R1 I 2.90.9 g Dry I07/20/00..30 0I03n/10 3600 1 Sc IU I INo I Ft valm U - Compoood/Aaile not detcted (<MDC) o Irs tiwan 3 sipna No - Peak not Idenifil in gamma qgecran

+ ,= Acm*itconcommtrooien *wcode and 3a*um uti amm ly) .Yes -Peak lideiflodingamaspedma a u* -=

High CeyoundfAnaya not detected Peak not datfle but eed actvity cmcenrtim eedsMDC and 3 siaga m Aeftivttyocouaionexicobodsmtwapofthvaluo, ***Uniolen derisnoe4do aenadlytcl reults rpored z Spe - M- c uA, oaimealspan itiqm venidtedooly the saqmpistedinthedemidion they L = Low ea=abytb H - lsh "Cocy MDC-i nknom Ddeeabble CoucaMedon Bolded text indlatm reqportala val4e. Pap 4 4