ML050590097

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Final Status Survey Release Record FR-0200 Yard East Survey Unit 1
ML050590097
Person / Time
Site: Maine Yankee
Issue date: 02/17/2005
From: Donna Anderson, Packer J, Pillsbury G, Tozzie R
Maine Yankee Atomic Power Co
To:
Document Control Desk, NRC/FSME
References
FR-0200-01, Rev 0
Download: ML050590097 (27)
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Text

MAINE YANKEE FINAL STATUS SURVEY RELEASE RECORD FR-0200 YARD EAST SURVEY UNIT I Prepared By: &A-. -o Date: ;1 8/o6 FSS Engineer - Signature aA -CM~ot Printed Name Reviewed By: FS Date: 2,l Ilo s FSSSp intr 2R tootle Printed Name Reviewed By: __2_= ___=_i_ Date: % /ZK4,EL.

1ndepend Rnteview - Signature Printed Name Approved By: Date:_____

/iFSS, MOP - Signature a#-c R. ,e 9 Printed Name Revision 0

MAINE YANKEE FINAL STATUS SURVEY RELEASE RECORD FR-0200 YARD EAST SURVEY UNIT I A. SURVEY UNIT DESCRIPTION Survey Unit FR-0200-01 Yard East was located in the southeast section of the site adjacent to the Back River. The 10,520 m2 area consisted of lands considered to be within the Protected Area of the plant, but outside the radiologically controlled Restricted Area (RA).

The survey unit is bordered by the Back River on the east, Bailey Point on the south, the current RA fence on the west and the former Circulating Water Pumphouse footprint on the north. The entire survey unit is contained within site coordinates 623,960E to 624,470E and 407,080N to 407,490N using the Maine State Coordinate System (West Zone) NAD 1927, as shown on Map FRO200-01 (Attachment 1).

The East Yard lay adjacent to the Industrial Area fence that surrounded the Turbine and Service Buildings during decommissioning. A majority of the survey unit lands were originally included within Maine Yankee's Protected Area, but were entirely outside the Restricted Area. The survey unit was formerly utilized for numerous functions that included:

  • Truck maintenance station
  • Office trailer park
  • Fuel Oil Storage Building constructed for storage of diesel generator fuel oil
  • Road and gateway to Bailey Point and Foxbird Island
  • Storage areas for "clean side" components such as transformers, etc.

Currently, the north section of the survey area is used as a maintenance station and truck radiological monitoring area. This portion of the survey area will be final surveyed at a later date as FR-0200 Survey Unit 2.

The majority of surfaces within Survey Unit I consist of soil with some patches of exposed or thinly covered ledge. Forest covers the eastern portion of land that extends along the Back River. All temporary structures have been removed and all former permanent structures have been demolished to at least 3-feet below grade. In addition, asphalt roadways within the area have been removed. A large excavation exists at the site of the former Fuel Oil Storage Building in the western portion of the survey area. Soil from the excavation is piled in a large mound in the southeast corner. The concrete sub-slab surfaces of the Fuel Oil Storage Building were surveyed under FB-0800-01. Portions of the building slab that were demolished and were thereby unable to be surveyed with E-600/43-68 instrumentation were excluded from the FB-0800-01 survey and included in the FR-0200-01 survey design.

Although the random mapping design of FR-0200-01 did not result in direct point locations falling within the unsurveyed portion of the building excavation, biased sampling was performed within this section to ensure residual radioactivity levels were less than the DCGL. Locations of the biased samples are shown on FRO200-04 (Attachment 1). The remaining terrain of Survey Unit 1 is generally level.

FR-0200-0 1, Revision 0 Page 2 of 27

B. SURVEY UNIT DESIGN INFORMATION The survey unit %vasdesignated a Class 3 land survey per the LTP (Table 5-1 C). The survey unit design parameters are shown in Table 1. Given a relative shift of 3.0, it was determined that 14 direct measurements were required for the Sign Test. Measurement locations were randomly determined and are illustrated on Map FRO200-02A (Attachment 1). Direct measurements (soil samples) were collected from the required locations and analyzed with laboratory gamma spectroscopy instrumentation.

In accordance with the LTP Table 5-3, gamma scans were required for I to 10% of the survey design area. Scan grids typically measuring 2 in by 5 m (10 in2 ) were established in the following areas:

  • West fence line along the current Restricted Area boundary
  • Former maintenance area
  • Former office trailer park
  • East security fence line of the former Protected Area along the Back River
  • Selected portions of the road and entrance to Bailey Point/Foxbird Island E-600/SPA-3 instrumentation was used to perform the scan surveys. The survey instruments used are listed by model and serial number in Attachment 2 (Table 2-1). The original 106 scan grids provided a scan area of approximately 1,060 m2 , exceeding 10% of the total survey area. Configuration of the original scan grids is illustrated on FRO200-03 (Attachment 1). Background values were established based on local scaler values in the survey unit. These background values were used to determine scan alarm setpoints and to divide the scan grids into 2 different background groups, as provided on FRO200 BK-02 (Attachment 1). The alarm setpoints were also used to confirm the scan MDCs used were appropriate. Scan MDCs are listed in Attachment 2 (Table 2-2) and are compared to the DCGL and the investigation level.

FR-0200-01, Revision 0 Page 3 of 27

TABLE 1 SURVEY UNIT DESIGN PARAMETERS Survey Unit Design Criteria Basis Area 10,520 m2 No limit for Class 3, based on LTP Area 0,520Table 5-2 Based on adjusted LBGR of 3.69 Number of Direct 14 pCi/g, sigma' of 0.17 pCi/g, and a Measurements Required relative shift of 3.0.

Type I = Type I =0.05 Sample Area N/A Class 3 Area Sample Grid Spacing N/A Class 3 Area Scan Grid Area 2 mx 5m (10m 2 ) Class 3 Area; < 10 m2 Area Factor N/A Class 3 Area S2>Class 3 Area - 1% to 10%

Scan Area 1,060 in,> 10% (LTP Table 5-3)

B a ckg ro un d l_ _ _ _ _.,.: _ _ _. _ _- _ _ _ _ _ _- _ _ _ _ _; _ _, _ _e _ _ _ _ _ _ _ _- _ _' _'" _

SPA-3 (Scan) 10,445 cpm Group I 11,268 cpm Group 2 Scan Investigation Level 3 Sigma of Background See Table 2-2, Attachment 2 (E-600/SPA-3) plus Background (Reference 6)

DCGL 4.2 pCi/g Cs-1 37 LTP, Rev. 3, Section 6.7 Design DCGLEMC N/A Class 3 Area C. SURVEY RESULTS As required, 14 direct soil measurements were performed in Survey Unit I and the results are presented in Table 2. All direct measurements were below the DCGL.

Two biased soil samples were obtained from the unsurveyed portion of the Fuel Oil Building footprint prior to backfill. The sample analyses did not identify Co-60 or Cs-I 37 above the MDAs.

A total of 104 grids were initially scanned using E-600/SPA-3 instrumentation. Only seven verified scan alarms were received. In addition, one grid was investigated due to low background. The investigation results are discussed in Section D.

It should be noted that two grids (S015 and S016) were not surveyed as part of the original scan due to an interference with construction equipment (ground heater). These grids will be surveyed as part of the expanded Class 1 area discussed in Section D.

LTP Revision 3, Table 5-IC for Yard East, R0200 FR-0200-01, Revision 0 Page 4 of 27

TABLE 2 DIRECT MEASUREMENTS Sample Location Cs-137 (pCi/g) Uncertainty (pCi/g)

FRO200-1-3SOOISS <6.97E-02 FRO200-1-3S002SS <6.92E-02 FRO200-1-3S003SS 5.82E-01 7.98E-02 FRO200-1-3SO04SS <5.75E-02 FRO200-1-3SO05SS <4.72E-02 FRO200-1-3SO06SS <6.00E-02 FRO200-1-3SO07SS <5.5 1E-02 FRO200-1-3S008SS <6.60E-02 FRO200-1-3S009SS 1.01E-01 3.05E-02 FRO200-1-3SOlOSS <4.76E-02 FRO200-1-3SOII SS <4.61E-02 FRO200-1-3S012SS <5.18E-02 FRO200-1-3S013SS <4.82E-02 FRO200-1-3SO14SS <5.53E-02 Mean 9.69E-02 Median 5.64E-02 Standard Deviation 1.40E-01 Sample Range 4.61E-02 to 5.82E-01 "4<" indicates MDA value. Bold indicates positive detection value.

Samples were also analyzed for Co-60. All were less than MDA.

D. SURVEY UNIT INVESTIGATIONS PERFORMED AND RESULTS Soil scans performned with the E-600/SPA-3 during initial surveys identified seven scanned grids with verified alarms. In addition, one grid with a low background count that did not meet the + 1,000 cpm requirement was also identified. As a result, investigation package XR0200-01 was written to perform additional scans within the eight identified grids and collect a soil sample at the highest scan location within each grid. The grids requiring investigation scans are illustrated on XR0200-02 (Attachment 1). As a result of the initial investigations, a total of eight soil samples were collected.

FR-0200-O1, Revision 0 Page 5of 27

Four of the scan grids with verified alarms (S018, S024, S030 and S033) fell along the west fence line between the current Restricted Area and the radiologically unrestricted area.

During decommissioning activities, it became necessary to add lands to the original Restricted Area footprint to establish staging areas for the temporary storage of building demolition debris, construction equipment, and excavated soils. The direct result was to expand the Restricted Area to include both the Turbine and Service Building footprints.

The current location of the excavated soil pile is directly adjacent to scan grids S019 through S032. In addition, water transferred from Restricted Area excavations and determined not to contain any gamma emitters is pumped to a holding pond within close proximity to scan grids S015 through S018. During the investigation ofFR-0200-01, soil samples taken within grids S024, S030 and a single particle taken from S033 identified Co-60 above the DCGL of 1.52 pCi/g. As a result of the investigation, a 4-meter wide area along the fence line, including scan grids SO15 through S050, was removed from survey area FR-0200-01 and wvill be included in the Class I final survey of FR-0200 Survey Units 3 and 9. Refer to map FRO200-05 (Attachment 1) for details.

Because 36 scan grids were removed from the survey design, the survey unit area was reduced from 10,520 m2 to 10,091 in2 . Instructions were then implemented to perform additional scans in a 4-meter wide swath adjacent to original scan grids S021 through SO50.

Thirty-four (34) grids were added to the scanned area, resulting in a total scan area of 1,023 mi2 . Locations of direct measurement points were not affected. The configuration of the additional scan grids is provided on map FRO200-05 (Attachment 1). Within the 34 additional scan grids, verified alarms were received in two grids while two grids with low background counts that did not meet the + 1,000 cpm requirement were also identified. A second investigation instruction was written to perform additional scans within the four identified grids and collect a soil sample at the highest scan location within each grid. The grids requiring investigation scans are illustrated on XR0200-03 (Attachment 1). As a result of the investigation, an additional four soil samples were collected.

Scan grids S018, S024, S030 and S033 that received verified alarms during the initial final survey were removed from the survey unit2 . As a result, a total of eight grids were investigated for this survey package. One investigation soil sample identified Cs-137 activity above the MDA but below the DCGL of 4.2 pCi/g Cs-137 while all other sample activities were less than the MDA. In addition, Co-60 was not identified in any of the eight samples.

Results of the soil samples are presented in Table 3-1 (Attachment 3).

2 Scan grids S015 through S050 were removed from Survey Area FR-0200-01 and will be included in the Class I final survey of FR-0200 Survey Units 3 and 9.

FR-0200-01, Revision 0 Page 6 of 27

E. SURVEY UNIT DATA ASSESSMENT An analysis of the direct sample measurement results, including the mean, median, standard deviation, and sample result range, is provided in Table 2. Of the 14 soil samples collected, 2 samples identified Cs-I 37 activity, with the highest reported value less than 15% of the DCGL. All other values were below the MDA. The identified sample activity and Minimum Detectable Activities are listed in Table 2. The mean and median activities for Cs-I 37 were also less than the DCGL. In addition, Co-60 was not identified in any of the 14 samples.

For illustrative purposes, as indicated in LTP Section 5.9.3, a simplified general retrospective dose estimate can be calculated from the average residual contamination level by subtracting the mean fallout Cs-137 value (0.19 pCi/g)3 for disturbed soil from the survey unit sample mean activity (0.0969 pCi/g). The net result is negative and would equate to an annual dose rate of 0.0 mrem/year. However, for purposes of demonstrating compliance with the radiological criteria for license termination and the enhanced State criteria, background activity was not subtracted from the soil sample analysis activity values.

F. ADDITIONAL DATA EVALUATION Attachment 4 provides additional data evaluation associated with this Survey Unit, including relevant statistical information. Based on survey unit direct measurement data, this attachment provides the Sign Test Summary, Quantile Plot, Histogram, and Retrospective Power Curve.

1. The Sign Test Summary provides an overall summary of design input (Table 1) and resulting calculated values used to determine the required number (N) of direct measurements (per LTP Section 5.4.2). The Sign Test Summary is a separate statistical analysis that also calculates the mean, median, and standard deviation of the direct measurements.

The critical value and the result of the Sign Test are provided in the Sign Test Summary table, as well as a listing of the key release criteria. As is shown in the table, all of the key release criteria were satisfied for the FSS of this survey unit. The sample standard deviation is smaller than the design sigma; therefore no additional samples were required.

2. The Quantile Plot was generated from the direct measurement data listed in Table 2. The data set and plot are consistent with expectations for a Class 3 survey unit. All of the measurements are well below the DCGL of 4.20 pCi/g for land outside the restricted area.
3. A Histogram Plot was also developed based on the direct measurement data values. This plot shows a log-normal distribution with one outlier.
4. A Retrospective Power Curve was constructed, based on FSS results. The curve shows that this survey unit having a mean residual activity at a small fraction of the DCGL has a high probability ("power") of meeting the release criteria. Thus, it can be concluded that the direct measurement data support rejection of the null hypothesis, providing high confidence that the survey unit satisfied the release criteria and that the data quality objectives were met.

3 See Attachment E to Maine Yankee Procedure PMP 6.7.8 (Reference 5).

FR-0200-0 1,Revision 0 Page 7 of 27

G. CHANGES IN INITIAL SURVEY UNIT ASSUMPTIONS ON EXTENT OF RESIDUAL ACTIVITY The survey was designed as a Class 3 land survey area. A portion of the survey area that was directly adjacent to the Restricted Area boundary was removed after elevated Co-60 soil samples were identified 4 . The FSS results (all direct measurements, remaining scan results, and additional scan results) were consistent with the Class 3 land survey classification. The direct measurement sample standard deviation was less than the design sigma. Thus, a sufficient number of sample measurements were taken and no additional measurements were required.

l!. LTP CHANGES SUBSEQUENT TO SURVEY UNIT FSS The FSS of Survey Unit I was designed, performed and evaluated in the December 2004 to February 2005 time frame. The design was performed to the criteria of the LTP Revision 3 (References 2 and 4). The only subsequent LTP change modified the Table 6-11 "Contaminated Material DCGL" to reflect an increased Deep Soil DCGL for Co-60 inside the Restricted Area. However, the Deep Soil DCGL change does not apply to this survey unit as the surface soil DCGL for areas outside the restricted area remained unchanged. No subsequent LTP changes with potential impact to this survey unit need to be evaluated.

1. CONCLUSION The FSS of this survey unit was designed based on the LTP designation as a Class 3 area.

The survey design parameters are presented in Table 1. The required number of direct measurements was determined for the Sign Test in accordance with the LTP. As presented in Table 2, all direct measurements were less than the DCGL of 4.2 pCi/g Cs- 137.

A Sign Test Summary analysis demonstrated that the Sign Test criteria were satisfied. The direct measurement sigma was determined to be less than that used for design, thus indicating that a sufficient number of samples was taken.

The Retrospective Power Curve shown in Attachment 4 confirmed that sufficient samples were taken to support rejection of the null hypothesis, providing high confidence that the survey unit satisfied the release criteria and the data quality objectives were met. Attachment 4 also revealed that direct measurement data represented essentially a log-normal distribution with one outlier.

4 Scan grids S015 through S050 were removed from Survey Area FR 0200-01 and will be included in the Class I final survey of FR-0200 Survey Units 3 and 9.

FR-0200-01, Revision 0 Page 8 of 27

The scan survey design for this survey unit was developed in accordance with the LTP Revision 3 Addenda (References 2 and 4) with significant aspects of the design discussed in Section B and Table 1. Scans performed with E-600/SPA-3 instrumentation resulted in a total of nine verified alarms and three low background locations. Two investigations were conducted via package XR 0200-01. Following the first investigation, the scan grids along the west fence line adjacent to the Restricted Area were subsequently removed from the survey unit and will be addressed in the Class I final survey of FR-0200 Survey Units 3 and

9. In addition, a total of 34 scan grids were added to the survey package. Five verified alarms and three grids with low backgrounds were investigated for this survey package. As a result of the investigations, a total of eight additional direct measurements wvere obtained.

All direct measurements were less than the DCGL of 4.2 pCi/g Cs-] 37.

It is concluded that FR-0200 Survey Unit I meets the release criteria of 10CFR20.1402 and the State of Maine enhanced criteria.

J. REFERENCES

1. Maine Yankee License Termination Plan, Revision 3, October 15, 2002 and Addenda provided by Maine Yankee letter to the NRC, MN-02-06 1, dated November 26, 2002
2. NRC letter to Maine Yankee, dated February 28, 2003
3. Maine Yankee letter to the NRC, MN-03-049, dated September 11, 2003 (LTP Supplement to LTP Revision 3)
4. Issuance of License Amendment No. 170, NRC letter to Maine Yankee, dated February 18, 2004
5. Maine Yankee Procedure PMP 6.7.8, FSS Data Processing and Reporting, Attachment E, Approach for Dealing With Background Radioactivity for Maine Yankee Final Status Surveys
6. Maine Yankee Calculation No. EC 009-01 (MY), Instrumentation Selection and MDC Calculation FR-0200-01, Revision 0 Page 9 of 27

Attachment 1 Survey Unit Maps FR-0200-01, Revision 0 Page 10 of 27

Maine Yankee I Maine Yankee Decommissioning Project Survey Map Map ID

  • FRO200-01 Decommissioning Team Deo msinng rIcMp 1 Survey Type OCi,.recteritatlos OTurnover OFInal St.tus Survey B*Bckg-.ond As...rment Survey Area Name: East Yard l RJT 11/18104 FIRO200 SUl East Yard FRO200 SUl = 10520 m2 FR-0200-01, Revision 0 Page I I of 27

Maine Yankee Decommissioning Team Man Yank Decommissioning eo msin Project Survey Map gireL 'Nap ID- FRO200-04 Sur.ey ?ype: QCharacterlhatlon OTurnover U Final Status Survey I1.ckground Assessment ISurvey Area Name: East Yard I RJT 12/6/04 FRO200 Survey Unit 1 EasL Yard Detail of Fuel Oil Storage Building Slab L< /

Notes:

- The Fuel Oil Storage Building was surveyed under package FBO800 SULI

- Portions of the building slab were demolished during demo actvities and were excluded from FB0800 SUI survey.

- Portions excluded from FB0800 SUI are included In FRO200 SUI as shown in map.

- Design of FRO200 SUI random direct measurements resultec in no locations falling within this area. Per direction of FSSE.2 supplemental samples were taken in this area prior to backfill. Samples Identified as FRO200 Sup-Ol. 02.

______ Indicates portions of sub slab solt F7 Included In FRO200 SUI FRO200 Sup-01 FR-0200-01, Revision 0 Page 12 of 27

Uaine Yaniekee Decommissioninr Team I Maine Yankee Decommissioning Project Survey Map ilap ID

  • FRO200-02A Survey Type: OCberacterIhstion Dr7urnover Urinal Status Survey Oaacklground Assessmnent ISurvey Area Name: East Yard I RJT 22/16/04 FRO200 Survey Unit 1 East Yard Sample Locations (Reflects use of Spare-l as S003) 0 0 0w 0 0 V

z 157.4 623960 150 140 130 120 a10 too IC 70 Ia

  • 1 60 50 40 30 20 10 x exis tutors)

FR-0200-01, Revision 0 Page 13 of 27

maine Yinkee Maine Yankee Decommissioning Project Survey Map lap ID

  • FRO200-03 7 East Yard S.rvey yp: OCh.raeLerlatlon DTuraover Final Statutsurvsy O[ftekgroand A.rnm.at Survey Area Name:

RJT 12/1/04 co FRO200 Survey Unit 1 East Yard >

Scan Locations Grids S015 to S120

Maine Yankee kee Decommissioning Project Survey Map Nnp ID

  • FRO200 BK-02 Decommissioning Team D omasi nSryn Surey Typ.: OCh r.etris.t- riJln. Stats. Survey U9aeg4o.J Annn..t Qsr...r. l Survey Area Name: East Yard BACKGROUND RANGE GROUP 1 9.445cpm - 11,445cpm GROUP 2 10,268cpm - 12.268cpm 0 0

Lfl IV I--

0 FR-0200-01, Revision 0 Page 15 of 27

Maine Yankee Maine Yankee Decommissioning Project Survey Map IMap ID

  • XR0200-02 Decommissioning Team I SUrTy. Type! OCh.racteriz.tio OTurD.Oyr *EfiD. Status Survey ODB.kground Ass.ssment Survey Area Name: East Yard l R2T 1ZO/04 XR0200 .Survey Unit 1 East Yard Investigation Scan Locations Grids S018,S024,S030,S033,S092,S098,S103,S109 o 0 o

0v D,. MNt 'O o 0 623960 E 624470

Maeine Yanke I Man Maine Yankee Decommissioning Project Survey Map DecornmissioningLkearn Survey Typet OCharacterhatlon DTurnever *PInal Status Survey OBachground Amessmeat ISurvey Area Name:

FRO200 Survey Unit 1 East Yard Additional Scan Grid Locations S122 to S155 New Grids S122 to S155 2

EjJ Scan Grid. Typcially 2m x 5m (tOr ) aZI To FM Previously scanned areas aI FR-0200-01, Revision 0 Page 17 of27

Namie Yankee

)ecommissioning Team aine Yankee Decommissioning Project Survey Map IManroe Survey Type: QChsracterI2ation OTurnever =Final Status Survey Onatkground Asse"Mont ISurvey Area Name:

XR0200 Survey Unit I East Yard 0 Investigation Scan Locations z Grids S122, S125, S147, S151 Scan Grid Typicol ly 2m x Sm (10m )2 S155-Investigation Scan Grid EZJ Previously Scanned S154-

~MN Re-Clossified Area ed Area Re-Clossifi Class 1 Area Fence Line Maintenance Area Roadway Trailer Park 40 Fence Line 4

FR-0200-01, Revision 0 Page 18 of 27

Attachment 2 Survey Unit Instrumentation FR-0200-01, Revision 0 Page 19 of 27

TABLE 2-1 INSTRUMENT INFORMATION E-600 S/N SPA-3 Probe SIN 2490 726554 1933 726561 2488 725890 1933 725328 1933 2056 1645 2253 2491 2056 2489 725890 HPGe Detectors (Laboratory Analysis)

Detector No. MDC (pCi/g) 1 FSSI 0.036 to 0.076 FSS2 0.036 to 0.076 TABLE 2-2 INSTRUMENT SCAN MDC, DCGL, AND INVESTIGATION LEVEL Parameter Instrument: SPA-3 Comments Scan MDC 5.9 pCi/g Cs-1 377 LT Rev 3 Table 5-6 (Reference 2)

Approved DCGL for land areas DCGL 4.2 pCi/g Cs-137 outside the Restricted Area, LTP Section 6.7 (References 2 and 4)

Investigation Level 12,800 cpm Group 1 (Alarm Setpoint) 13,700 cpm Group 2 FR-0200-01, Revision 0 Page 20 of 27

Attachment 3 Investigation Table FR-0200-01, Revision 0 Page 21 of 27

TABLE 3-1 XR0200-01 INVESTIGATION SOIL SAMPLING RESULTS EeaeGrd Elevated Grid Initiall Scan Alarm Sepint Invest.

aler Activity Uncertainty DCGL Sample Location Value Sepon Value (pCig Cs-137) (pCig Cs-137) Comparison Sape(cpm) (cpm) (cpm)______ _____

XR0200013S092 13,880 12,800 12,730 6.23E-02 2.50E-02 < DCGL XR0200013S098' 10,630 12,800 9,170 < 5.99E-02 <DCGL XR0200013S103 12,950 12,800 11,220 < 4.12E-02 < DCGL XR0200013S109 13,710 12,800 13,000 < 4.99E-02 < DCGL XR0200013S122' 11,880 13,700 10,090 < 5.35E-02 < DCGL XR0200013S125 14,100 13,700 10,470 < 4.72E-02 < DCGL XR0200013S147' 12,160 13,700 10,560 < 4.64E-02 < DCGL XR0200013S151 15,180 12,800 11,060 < 4.68E-02 < DCGL Survey Unit Mean / DCGL 0.023 Total 0.023 NOTES: 1. Scan grids investigated due to low background readings and not alarms.

2. "<" indicates value less than MDA, MDA value is reported.
3. The samples were also analyzed for Co-60; all were less than an MDA of 0.06 pCi/g.

FR-0200-01, Revision 0 Page 22 of 27

Attachment 4 Statistical Data FR-0200-01, Revision 0 Page 23 of 27

Survey Package FR 0200 Unit 1 Soil Sign Test Summary Survey Package: FR 0200 Yard East Survey Unit: 01 Evaluator: DA DCGL,: 4.20E4O0 Cs-137 DCGL DCGLfC: NIA Class 3 Area LBGR: 3.69E400 adjusted Sigma: 1.70E-01 LTP Rev 3, Table 5-1C (R0200)

Type Ierror: '. 0.05 Type II error: 0.05 Nuclide: CS-1 37 Soil Type: NIA

'Si.Z'-';;; i*',X -',acuated.'Valui+ oLr - 't' ,~-i-<-C'r'e~t 1.645 Z1--  ; , 1.645 Sign p: 099865 Calculated Relative Shift: '3.

Relative Shift Used: .3. Uses 3.0 if Relative Shift is >3 N-Value- - ' 11 __

N-Value+20%: - 14 ' ' 1i Number of Samples: ...' " *_ -%'1i 14 Median: , 5.64E-o2_

Mean:  :-. 9.69E-02 Net Sample Standard Deviation: . i.40E-01 Total Standard Deviation: . 1.40E-01 Maximum: 82E-01 Adjusted N Value: , 14 _ _- _ __i4 S+Valuew ;4 -: 'tF.14 Critical Value: :1 t Sign test results: '. . Pass Sufficient samples collected: Pass Maximum value <DCGLw: Pass Median value <DCGL,- Pass _____________

Mean value <DCGy -w as Maximum value <DCGLbmc j Pass N/A for Class 3 Total Standard Deviation <=Sigma: Pass

,;7 O-s.

Criteria comparison results: <i K;At- Pass The survey unit passes all conditions: -' . Pass Survey Unit Passes FR 0200-SU1-SoiISigwn ds 2N1O5 4:18 PM FR-0200-0 1, Revision 0 Page 24 of 27

FR-0200 SU-1 Quantile Plot 7.OOE-01 6.OOE-01 5.OOE-01 IIII b

4.OOE-01 l

0~

4-

  • Activity (pCi/g) 0 8

._ 3.OOE-01 -Median (pCi/g) a-<

C>

2.OOE-01 1.OOE-01 O.OOE+OO 0 25 50 75 100 Percent

One-Sample T-Test Report Page/Date/Time 2 217/05 2:45:51 PM Database Variable C2 Plots Section Histogram of FR-0200, SU-1 20, 0,

C) 1-E co "I ",

U) 0 10-E z 5.

o.

0.000 0.150 0.300 0.450 o0.600 Activity (pCi~g)

FR-0200-01, Revision 0 Page 26 of 27

One-Sample T-Test Power Analysis Page/Date/Time 2 217/05 2:47:42 PM Chart Section Retrospective Power Curve 1.0-,e;

, I I I

0. , I . I L-a) ,I I I, 0

a.

0.4 , _ I 0.2 A,

00I 0

v I

II

-~k-I Survey Unit Mean (pCi/g)

FR-0200-01, Revision 0 Page 27 of 27

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