ML043640261

Maine Yankee Final Status Survey Release Record FR-0111 Yard West Excavations Survey Unit 5

ML043640261
Person / Time
Site:	Maine Yankee
Issue date:	12/22/2004
From:	Donna Anderson, Dockins L N, Pillsbury G Maine Yankee Atomic Power Co
To:	NRC/FSME
References
MN-04-060, RA-04-118 FR-0111-05, Rev 0
Download: ML043640261 (25)

Text

MAINE YANKEE FINAL STATUS SURVEY RELEASE RECORD FR-01 11 YARD WEST EXCAVATIONS SURVEY UNIT 5 Prepared By: b e S ve Date: /At/L lo4l FSS Engineer -Signature b. AdMKSoAJ Printed Name Reviewved By: _ _ _ _ _ Date: g z-/Jt Jo 4 FSS'Specialist

-Signature Printed Name Reviewed By: 5 -Date: /2 (2/ / y Independent Review -Signature Printed Name Approved By: i Date: t/V-/-' ntnFSS, MOP -Signature, Printed Name Revision 0 MAINE YANKEE FINAL STATUS SURVEY RELEASE RECORD FR-0111 YARD VEST EXCAVATIONS SURVEY UNIT 5 A. SURVEY UNIT DESCRIPTION FR 01 11 Yard West Excavations Survey Unit 5 consisted of sub-surface soils within the Restricted Area back yard southwest of the former Containment Building.

The survey unit was located at coordinates 407,450 N and 623,700 E using Maine State Coordinate System (West Zone) NAD 1927. It was bounded on the east by FR 01 I Survey Unit 4, on the northeast by the concrete slab left from the Equipment I-latch, on the south by FR 0111 Survey Unit 7 and the Forebay, and on the west by FR 0111 Survey Unit 6. The location of the 1119.2 m 2 survey unit in relation to the Containment Building and the surrounding FR 01 11 survey units is shown on map FROI 1 IU5-SITE (Attachment 1).Survey Unit 5 contained a large hole with an average diameter of 7 meters and an approximate depth of 3 meters in the southeast portion of the survey unit. Removal of a portion of the storm drain system left a trench that traversed the north section of the survey unit. Additional contributors to the uneven terrain included the demolition and removal of the Refueling Water Storage Tank (RWST), the RWST heater and the concrete foundations on which the systems had been constructed.

A profile of the terrain levels and excavated depths is shown on map FRO I 1 U5-INFO (Attachment 1).B. SURVEY UNIT DESIGN INFORMATION During the operating life of the plant, leaks occurred from the RWST heater and associated component cooling piping to the environs within the Restricted Area. Characterization activities identified several surface and sub-surface locations with elevated activity greater than the DCGL. As a result, this survey unit met the requirements for a Class 1 area and was designated as such, in accordance with the LTP Revision 3, Table 5-l C.The survey unit design parameters for FR 0111 Survey Unit 5 are shown in Table 1. Given a relative shift of 0.8, it was determined that 40 direct measurements were required for the Sign Test. Because the measurement locations were based on a systematic square grid with a random start point, the N=40 design led to a survey unit map with 41 locations.

The direct point-locations are illustrated on map FROI I IU5-DIRECTS (Attachment 1). Direct measurements consisting of soil samples collected from required locations were analyzed with laboratory gamma spectroscopy instrumentation.

In accordance with the LTP, scans covering 100% of the 1,119.2 m 2 area were required for the Class I survey unit. This was accomplished by use of an in situ gamma spectroscopy detector configured at a 3-meter distance from the surface to obtain approximately 28-mi 2 fields of view to a depth of 15 centimeters.

Locations of the 60 survey scans are shown on map FROI I 1 U5-SCANS.FR-0I 111-05, Revision 0 Page 2 of 25 Additional ISOCS scans incorporated evaluations based on four geometries including horizontal.

vertical, round hole and trench. The additional scans wvere performed as follows:* I vertical scan was collected over the hole in the southeast portion of the survey unit with the ISOCS detector positioned at the top plane of the hole. The approximate location of the scan is shown on map FRO I I IU5-HOLE.* 13 scans were performed on vertical surfaces of the drain pipe trench. The detector was positioned horizontally at 2 meters from the vertical surface to obtain overlapping 12-mr 2 fields of view. Eleven measurements were performed on the vertical soil of the trench wall while 2 measurements were centered on exposed vertical ledge. The scans are illustrated on map FRO]I I U5-VERTICAL.

• 6 scans were performed on vertical surfaces of the remaining equipment hatch concrete slab along the northeast boundary of the survey unit. The detector was positioned horizontally at 2 meters from the concrete surface to obtain overlapping 12-mr 2 fields of view. The measurements are provided on map FROI 1 1U5-CONCRETE.

• 12 vertical scans were performed on the floor surfaces of the drain pipe trench, using a"U-channel" geometry.

The detector was positioned 2 meters above the surface plane to obtain overlapping 24-m 2 fields of view. The measurements are illustrated on map FROI 1 U5-TRENCH.

The combination of all ISOCS scans conservatively ensured greater than 100% scan coverage of all exposed surfaces within Survey Unit 5. The survey instruments used are listed by model and serial number in Attachment 2 (Table 2-1). Scan MDCs are also listed in Attachment 2 (Table 2-2) and are compared to the DCGL, the investigation level, and the DCGLENC. As shown in this table, the scan MDC is less than the scan investigation level in all cases, thus providing high confidence (95% or higher) that an elevated area would be detected in the scanning process. Further, since the investigation level was always less than the design DCGLEMC, no EMC sample size adjustment was necessary.

FR-0 11-05, Revision 0 Page 3 of 25 TABLE I SURVEY UNIT DESIGN PARAMETERS Survey Unit l Design Criteria l Basis Area 1,119.2 mL Class 1, < 2,000 m'Based on LBGR of 1.2 pCi/g, Number of Direct 40 sigma' of 1.33 pCi/g, and a relative Measurements Required shift of 0.8.Type I = Type II = 0.05 Sample Area 27.98 m' 1,119.2 mZ / 40 = 27.98 m'Sample Grid Spacing 5.29 m (27.98)"1 Scan Grid Area ISOCS scan various See Section B distance Area Factor 1.77 Class I Area, LTP Table 6-12 Scan Area 1,119.2 m' Class I Area -100%Scan Investigation Level See Table 2-2 Reference Attachment 2 DCGL 2.39 pCi/g Cs-137 LTP Revision 3, Table 6-11 0.86 pCi/g Co-60 (Reference 4)Design DCGLENIC 4.23 pCi/g Cs-137 DCGL x Area Factor for Class 1 1.52 pCi/g Co-60 survey unit, per LTP Section 5.6.3 C. SURVEY RESULTS A total of 41 direct measurements were performed in Survey Unit 5. All direct measurements were below the DCGL. The results are presented in Table 2.ISOCS gamma scans were performed at 61 locations using an investigation level of 1.0 pCi/g Cs-137 and 0.36 pCi/g Co-60. In addition, ISOCS gamma scans were performed at 19 locations using an investigation level of 2.2 pCi/g Cs-137 and 0.8 pCi/g Co-60. ISOCS gamma scans were performed at 12 locations using an investigation level of 1.0 pCi/g Cs-137 and 0.5 pCi/g Co-60. The gamma scans %vere performed for a sufficient count time to achieve a Minimum Detectable Activity of approximately 25% of the DCGL. All identified activity levels were below the investigation levels. Therefore, no investigations were required.LTP Revision 3, Table 5-lC for RCA Yard West, ROI00.FR-OI 11-05, Revision 0 Page4 of 25 TABLE 2 DIRECT MEASUREMENTS Sample Cs-137 Uncertainty Co-60 Uncertainty Unitized Value of Number (pCi/g) (pCi/g) (pCi/g) (pCi/g) Unity Rule FRO111051SOOI

< 5.73E-02 < 5.33E-02 8.60E-02 FROI 1105 1S002 < 4.26E-02 < 4.13E-02 6.58E-02 FROI 1051S003 < 5.38E-02 < 4.74E-02 7.76E-02 FROI 11051S004

< 4.85E-02 < 4.93E-02 7.76E-02 FROI1105ISO05

< 5.38E-02 < 5.66E-02 8.83E-02 FR011051SO06

< 6.01 E-02 < 6.70E-02 1.03E-01 FR0111051S007 2.09E-01 3.64E-02 < 5.63E-02 1.53E-01 FRI01051S008

< 4.8513-02

< 5.56E-02 8.49E-02 FROIII051S009

< 4.6413-02

< 4.6513-02 7.35E-02 FRO11051SO10

< 5.0913-02

< 5.02E-02 _ 7.9713-02 FROI I 1051SOII 2.94E-01 4.6913-02

< 5.6313-02 1.8913-01 FRO11051OSO12

< 6.811E-02

< 5.06E-02 _ 8.73E-02 FRO 1105IS013 9.97E-01 9.5613-02 1.59E-01 4.8813-02 6.0213-0I FR01105I1SO14 6.22E-01 6.0713-02

< 4.7213-02 3.15E-01 FR0111051SO15

< 5.2013-02

< 5.23E-02 8.26E-02 FRO11105IS016

< 4.8013-02

< 5.3013-02 8.17E-02 FR011051S017 I.22E-01 3.45E-02 < 4.8513-02 1.0713-0I FRO111051S018 6.57E-01 6.8713-02

< 6.5213-02 3.511E-0I FRO111051S019 4.70E-01 5.90E-02 < 5.0813-02 2.5613-01 FRO111051S020 1.23E+00 1.0213-01

< 5.9513-02 5.86E-0I FR0111051S021

< 4.88E-02 < 5.4613-02 8.39E-02 FRO111051S022

< 4.9613-02

< 5.60E-02 8.5913-02 FRO111051S023 3.74E-01 4.7613-02

< 5.211E-02 2.17E-0I FR0111051S024

< 6.81E-02 < 7.79E-02 1.913-01I FROI 1105 1S025 3.62E-01 4.88E-02 < 5.73E-02 2.18E-0I FR0111051S026

< 7.4013-02

< 6.87E-02 1.1 IE-OI FRO111051S027

< 6.7913-02

< 6.5413-02 1.0413-01 FRO111051S028 9.64E-02 3.26E-02 < 5.211E-02 1.0I1E-0I FRO111051S029

< 7.8613-02

< 8.4313-02 1.31E-0I FROI11051S030

< 5.25E-02 < 5.1313-02 8.166E-02 FROI 11051S031 4.09E-01 5.9213-02

< 6.7913-02 2.5013-01 FRO111051S032

< 6.15E-02 < 6.38E-02 9.99E-02 FR01 11051S033 1.06E-01 3.5613-02

< 7.28E-02 1.29E-0I FROI 1105 1S034 < 6.5413-02

< 5.93E-02 9.63E-02 FRO 11051S035

< 4.4613-02

< 4.7 1 E-02 7.34E-02 FRO111051S036 2.63E-01 4.7213-02

< 5.6313-02 1.7613-0I FROI 1051S037 1.58E+00 1.2213-01

< 6.9213-02 7.431E-0I FR0111051S038

< 8.43E-02 < 6.46E-02 1.IOE-01 FR0111051S039

< 5.38E-02 < 4.8913-02 7.9413-02 FROI 1105 1S040 2.09E-01 4.7513-02

< 6.8613-02 1.67E-01 FROI 1105 1S041 < 5.8913-02

< 5.0513-02 8.34E-02 AMean 2.30E-01.

5.99E-02 1.66E-OI Median 6.81E-02 5.60E-02 1.03E-OI Standard Dev. 3.43E-01 1.84E-02 1.53E-O1 Range 4.26E-02 to 1.58E+00 4.13E-02 to 1.59E-01 6.58E-02 to 7.43E-O1"<" indicates MDA value. Bold indicates positive detection value.FR-OIl 1-05, Revision 0 Page 5 of 25 It should be noted that the Co-60 DCGL of 0.86 pCi/g is an "adjusted DCGL" and can be derived from the unitized dose for surface soil, LTP Table 6-7 and the updated dose model in the activated concrete related license amendment (References 3 and 4). The Co-60 DCGL for surface soil is I pCi/g x 10/6.58 mremly (from LTP Table 6-7) or 1.52 pCi/g Co-60. This DCGL is further limited by the dose contribution allowed for surface soil only in the basement fill model per LTP Section 6 Attachment IX (revised LTP Table 6-1 1) in the activated concrete license amendment.

Thus, the Co-60 adjusted DCGL is 1.52 pCi/g x 5.63/10 mrem/yr or 0.86 pCi/g.D. SURVEY UNIT INVESTIGATIONS PERFORMED AND RESULTS No investigations were required.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 41 soil samples collected, 16 identified Cs-137 activity below the DCGL value of 2.39 pCi/g while I sample identified Co-60 activity below the DCGL value of 0.86 pCi/g. All other values were below the MDA.Identified sample activities or Minimum Detectable Activities are listed in Table 2. The mean and median activities were less than the DCGL for both Co-60 and Cs-137. The highest reported value was less than 75% of the unitized DCGL.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)2 for disturbed soil from the survey unit sample mean activity (0.23 pCi/g). Taking into account the average residual contamination level for Co-60, the annual dose rate would equate to 0.49 mrem/year 3.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.2 See Attachment E to Maine Yankee Procedure PMP 6.7.8 (Reference 5).3 This annual dose equivalent is based on LTP Table 6-11 which shows the RA contaminated soil contribution (for soils contaminated at the DCGL) to be 5.63 mrem/y. Therefore, the annual dose rate would equate to ( 0.23- 0.19 0.0599 Annual Dose Rate = 5.63 x -+ I= 0. 49 mrem l y 2.39 0.86 1 FR-Ol 11-05, Revision 0 Page 6 of 25

...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 clearly satisfied for the FSS of this survey unit.2. The Quantile Plot was generated from the unity value data listed in Table 2. The data set and plot are consistent with expectations for a Class I survey unit. All of the measurements are below the DCGLs for land inside the restricted area. The highest direct measurement (S037) was less than 75% of the unitized DCGL.3. A Histogram Plot was also developed based on the unity values. This plot shows a log-normal distribution with three outliers.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.G. CHANGES IN INITIAL SURVEY UNIT ASSUMPTIONS ON EXTENT OF RESIDUAL ACTIVITY The survey was designed as a Class I land survey area; the FSS results were consistent with that 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.11. LTP CHANGES SUBSEQUENT TO SURVEY UNIT FSS The FSS of Survey Unit 5 was designed, performed and evaluated in mid 2004. The design was performed to the criteria of the LTP Revision 3 (References 2 and 4). No subsequent LTP changes with potential impact to this survey unit need to be evaluated.

FR-0 11-05, Revision 0 Page 7 of 25

1. CONCLUSION The FSS of this survey unit was designed based on the LTP designation as a Class I area.The survey design parameters are presented in Table 1. The required number of direct measurements wvas determined for the Sign Test in accordance with the LTP. As presented in Table 2, all direct measurements were less than the DCGLs of 2.39 pCi/g Cs-] 37 and 0.86 pCi/g Co-60.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 showvn 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 three outliers.The scan survey design for this survey unit wvas developed in accordance with the LTP Revision 3 Addenda (Reference 2 and 4) with significant aspects of the design discussed in Section B and Table 1. ISOCS scans performed at a distance of 3 meters in a systematic grid pattern throughout the survey unit did not identify activity above the scan investigation levels of 1.0 pCi/g Cs-137 and 0.36 pCi/g Co-60. Scans conducted on vertical trench walls, trench floors, and vertical concrete surfaces did not identify activity above the scan investigation levels of 2.2 pCi/g Cs- 137 and 0.8 pCi/g Co-60 for those scans performed at a distance of 2 meters.It is concluded that FR 0111 Survey Unit 5 meets the release criteria of IOCFR20.1402 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-02-061, 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 EC-003-04 FR-01 11-05, Revision 0 Page 8 of 25 Attachment I Survey Unit Maps FR-01 1 1-05, Revision 0 Page 9 of 25 Maine Yankee Yne rie uvyIM DI~~ ICT Decommisslonin Team Maine YaneeDecommissioningPoject SurveyMap l map1D#FR011U5-SITE Survey Type: -.Characterization Turnover a Final Status Survey Survey Area Name: Site Locator IPreparedBy:

Larry N. Dockins Dote: 1 2/13/04 L.b 7 ( o 1 a.or 0 0 ii'.D 0>0)rn FR-O I 11-05, Revision 0 Page 10 of 25 Maine Yankee Decommissioning Team Survey Type: Characlerizalion Maine Yankee Decommissioning Project Survey Map Mao lD#FRO 11 U5-INFO I Turnover D Final Status Survey SurveyAreoNome:

Excavation Depths Prepared By: Lorry N. Dockins Date: 8/1 6/04 5 I I., I e I I'i I I I I -I I I I 50m FR-OI I1-05, Revision 0 Page I I of 25 Maine Yankee Decommissioning Project Survey Map MaD ID# FROl I 1U5-DIRECTS Turnover

• FInal StatusSurvey SurveyArea Name: Directs -Volumetrics Prepared By: Larry N. Dockins Date: 8/11/04 l///'E02) (E)9 x 32 3T k- I5.2'7 3x XE)3S--XX-- x x_.,I.I 0 l 50m FR-0 I 1 1-05, Revision 0 Page 12 of 25 Maine Yankee Decommissioning Team Survey lype: Characterlzation Maine Yankee Decommissioning Project Survey Map Map ID# FROI 1 1U5-SCANS Turnover t FInal Status Survey Survey Area Name: Area Scans -ISOCS PreparedBy:

Larry N. Dockins Date: 8/14/04 Il I I I I I 5non FR-O 11-05, Revision 0 Page 13 of 25 Maine Yankee Maine Yankee* Decommissioning Team Survey Type: Characterization Maine Yankee Decommissioning Project Survey Map MOa ID# FROl 11 U5-HOLE Turnover f Final Status Survey SurveyArea Name: Hole Scan (1 80~ collimator)

Prepared By: Larry N. Dockins Date: 8/16/04 eTl --,_,.,i /I i>,/I'J,.I I k -I-- A ..x IN .-'1 .9i 1.9m \> x N1--2;I FR-O 11 1-05, Revision 0 Page 14 of 25 50m Maine Yankee Decorzrnnissb g learn Survey TyPe: Characterizarlon Maine Yankee Decommissioning Project Survey Map Moap FR0l 11 U5-VERTICAL, Turnover

• Final Stotus Survey SurveyAreaN rne: Vertical Scan Locations Piepared By Larry N. Dockins Dote: 8/1 6/04 1.j.//I/7/,--I, 1"I ,,"',I, N,1-1 XI I I .I I 50m Note: SOO1 -SOi l centered on vertical surface above trench level(1 3.5' el.). SO12 & SO13 centered on the exposed vertical ledge. FR-0I 11-05, Revision 0 Page 15 of 25 Mine Yankee Decormmss inrr Team Survey Type: -Characterization Maine Yankee Decommissioning Project Survey Map Mop ID# FROH 1 1U5-CONCRETE

... .... _ _ ..._ ....' .. .. ... .. ...............

_ ....._ ... ._ ..Turnover

• Final Status Survey SurveyArea Name: Concrete Scan Locations Prepared 8 v. Larry N. Dockins Date 8/16/04/... .,. ., I -, I,/a'"I'J-N k- ' 1.>\ /X -I-,- y I I 6 50in Note: COO] -C006 centered on exposed vertical concrete surfaces below the 1 7'el.FR-OI 11-05, Revision 0 Page 16 of 25 Maine Yankee Decommissioning Team Survey Type: Characterization AMaine Yankee Decommissioning Project Survey Map Map ID# FROl 11U5-TRENCH!

Turnover

• Flnol Status Survey SurveyArearName:

Trench Scan Locations Prepared By: Larry N. Dockins Date: 8/16/04//I.7 N I -\/t3I M-9/--I_i, I I I I I 50mn FR-0I 11-05, Revision 0 Page 17 of 25 Attachment 2 Survey Unit Instrumentation FR-O1 11-05, Revision 0 Page 18 of 25 TABLE 2-1 INSTRUMENT INFORMATION ISOCS Dctectors (Ficld Measuremcnts)

Detector Number I MDC (pCilg)7722 J 0.1 to 0.4 7607 I 0.1 to 0.4 HPGe Detectors (Laboratory Analysis)I Dctector Number I MDC (pCilg)FSSI f 0.04to0.11 IFSS2 0.04 to 0.11 TABLE 2-2 INSTRUMENT SCAN MDC, DCGL, INVESTIGATION LEVEL AND DCGLEMC Detector Instrument Comments Scan MDC ISOCS: 0.1 to 0.4 pCi/g 25% DCGL 2.39 pCi/g Cs-137 Approved DCGL for land areas DCGL 0.86 pCilg Co-60 inside the Restricted Area, (Reference 4)Investigation Level 1.0 pCi/g Cs-137 Reference 6 (ISOCS @ 3 m) 0.36 pCi/g Co-60 Investigation Level 2.2 pCi/g Cs-137 Reference 6 (ISOCS @ 2 m) 0.8 pCi/g Co-60 Investigation Level 1.0 pCi/g Cs-137 (ISOCS trench) 0.5 pCi/g Co-60 4.23 pCilg Cs-137 DCGL x Area Factor for Class I Design DCGLENMC 1.52 pCilg Co-60 survey unit, per LTP Section_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _5 .6 .3 FR-01 11-05, Revision 0 Page 19 of 25 Attachment 3 Investigation Table (No Investigations Required)FR-01 11-05, Revision 0 Page 20 of 25 Attachment 4 Statistical Data FR-01 11-05, Revision 0 Page 21 of 25 Survey Package FROI1 Unit 5 UNITY Soil Sign Test Summary j-,! ',i Evaltzation'IriputValu'es i' :c ,, .: Comments Survey Package: FRO111 Yard West Excavations Survey Unit: 05 Evaluator:

DA DCGL,: 1.OOE+O0 Unity DCGLem,: 1.77E+00 AF x Unity LBGR: 5.OOE-01 50% of DCGL Sigma: 5.56E-01 Unitized (1.33 pCi/g /2.39 pCi/g)Type I error: 0.05 Type II error: 0.05 Nuclide: UNITY Soil Type: N/A-CaiiiulatedVi e --.. r i: ' eCom et .Zi. <: 1.645 Zp: 1.645 Sign p: 0.788145 Calculated Relative Shift: 0.8 Relative Shift Used: 0.8 Uses 3.0 if Relative Shift is >3 N-Value: 33 N-Value+20%:

40><-Y >Sam pleDataValuens

.. .-A..C...e---

r Number of Samples: 41 Median: 1.03E-01 Mean: 1.66E-01_Net Sample Standard Deviation:

1.53E-01 Total Standard Deviation:

1.53E-01 Sum of samples and reference Maximum: 7.43E-01.-s -'s ^8.-'- ig.e$In Te t Resul s'A ,c,<, s ;' .' ' ommns' -;Adjusted N Value: 41 S+ Value: 41 Critical Value: 26 Sign test results: Pass Sufficient samples collected:

Pass Maximum value <DCGLw: Pass Median value <DCGL,: Pass Mean value <DCGL : Pass Maximum value <DCGLemc:

Pass Total Standard Deviation

<=Sigma: Pass Criteria comparison results: Pass Te .uv,.y..-

u -'inas Status.:IPas s I______ _.____surv___________ey un_*_it Passes The survey unit passes all conditions:l Pass Survey Unit Passes FROI I 1-SU5-Soi1Sign-UN1TY.xls 12114104 12:14 PM FR-01 1 1-05, Revision 0 Page 22 of 25 FR-01 1 1 SU-5 Quantile Plot 0o..O" x c~j ,,,'A 5'To 4-N._-._._0.8 0.7 0.6 0.5 0.4 0.3 0.2 0.1 0.4 * .-l-* Activity (unitized)

-Median (unitized)

...I , _ ....... ... ....-I 0 25 50 Percent 75 100 One-Sample T-Test Report Page/Date/Time Database Variable 2 12/8/04 2:37:35 PM C2 Plots Section Histogram of FR-01 11, SU-5 35, Un CD 26 E Co o 18 E Z 9 0.0 ..0.2 0.4 Activity (unitized) 0.6 0.8 FR-Oi 11-05, Revision 0 Page 24 of 25 One-Sample T-Test Power Analysis Page/Date/Time 2 12/8/04 2:38:32 PM Chart Section L_.a)0 a-1.0-0.8-0.6-0.4 -0.2 -0.0 _0.1 Retrospective Power Curve-. -I ------:--X---.. -------.. ---0.3 0.5 0.7 0.9 Survey Unit Mean (unitized) 1.1 FR-OI 11-05, Revision 0 Page 25 of 25