ML043640244

Maine Yankee Final Status Survey Release Record FR-0111 Yard West Excavations Survey Unit 4

ML043640244
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-0111-04, Rev 0
Download: ML043640244 (22)

Text

MAINE YANKEE FINAL STATUS SURVEY RELEASE RECORD FR-0 11 YARD WEST EXCAVATIONS SURVEY UNIT 4 Prepared By: ci. Und id&c- Date: mlt:51oi FSS Engineer -Signature Printed Name Reviewed By: Date: */ 6/ 4§iStpecialist-Signature t f et'- I Printed Name Reviewed By: G Date: (Z//;%/a Independent Review -Signature/Prj ted ame Approved By: Date: 1/Z1Zbe4 wrnede ,S;7Silnature 7Printed 1ane Approved By: A -.£ ~* Date: y, FSS, MOP -Signature Of Printed Name MAINE YANKEE FINAL STATUS SURVEY RELEASE RECORD FR-0111 YARD WEST EXCAVATIONS SURVEY UNIT 4 A. SURVEY UNIT DESCRIPTION FR 0111 Yard West Excavations Survey Unit 4 wvas a large excavation directly south of the former Containment Building.

The survey unit was located at coordinates 407,400 N and 623,750 E using Maine State Coordinate System (West Zone) NAD 1927. It wvas bounded on the south by FR 0111 Survey Unit 7, on the northeast by FR 0111 Survey Unit 3 (south of the former Spray Building and the HV 7/9 foundation), and on the west by FR 0111 Survey Unit 5. The location of the 1,061 m 2 survey unit in relation to the Containment Building and the surrounding FR 0111 survey units is shown on map FRO I I U4-SITE (Attachment 1).The excavation that encompassed the majority of Survey Unit 4 resulted from the removal of contaminated sub-surface soil at locations S010, S012, S017, S099, and S109 as identified in Characterization Package CR5000. Contributing to the size of the excavation was the removal of the storm drain piping system, and 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.

The resulting terrain ranged from 1.8 meters (6 ft) to 3 meters (10 ft) below the normal elevation.

A profile of the terrain levels and excavated depths is shown on map FRO 11 IU4-INFO.B. SURVEY UNIT DESIGN INFORMATION Survey Unit 4 met the LTP Revision 3 definition for a Class I survey unit. The survey unit design parameters 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 48 locations.

The direct point locations are illustrated on map FRO1I IU4-DIRECTS (Attachment 1). Direct measurements consisting of soil samples were collected from required locations and analyzed with laboratory gamma spectroscopy instrumentation.

In accordance with the LTP, scans covering 100% of the 1,061 m 2 area were required for the Class 1 survey unit. This was accomplished by use of an in situ gamma spectroscopy 2 detector configured at a 3-meter distance from the surface to obtain overlapping 28-mi fields of view. Locations of the 62 survey scans are shown on map FROI 1U4-Scans (Attachment 1). Additional ISOCS scans were performed in the following geometries to ensure all terrain levels within the survey unit were scanned:* ISOCS scans were performed on the concrete foundation of the former HV-7 / 9 Building where the foundation formed the north boundary for the survey unit. A total of 6 horizontal gamma scans were performed 2 meters from the concrete surface to obtain overlapping 12 in 2 fields of view along the exposed slab. Locations of horizontal scans are provided on map FRO 1 I U4-CONCRETE (Attachment 1).* Gamma scans were performed on the trench floors/wvalls that permeated the survey unit.A total of 33 vertical gamma scans were performed 2 meters above the surface plane of the trench floor to obtain approximately 24 mi 2 fields of view, using a "U-channel" geometry.

Locations of trench scans are provided on map FRO I I IU4-TRENCH.

FR-O1 11-04, Revision 0 Page 2 of 22 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 DCGLENIC.

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 DCGLErC, no EMC sample size adjustment was necessary.

TABLE 1 SURVEY UNIT DESIGN PARAMETERS Survey Unit Design Criteria l Basis Area 1,061 m' Class 1, < 2,000 ml Based on an LBGR of 1.2 pCi/g, Number of Direct sigmal of 1.33 pCi/g and a relative Measurements Required 40 shift of 0.8.._ Type I = Type 11 = 0.05 Sample Area 26.53 m' 1,061 m'/ 40 = 26.53 m" Sample Grid Spacing 5.15 m (26.53)"'h ISOCS scan at 3 m for Scan Grid Area 28-mr 2 field of view Reference 6 Area Factor 1.78 Class I Area, LTP Table 6-12 Scan Area 1,061 m' Class 1 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 4.25 pCi/g Cs-137 DCGL x Area Factor for Class I 1.53 pCi/g Co-60 survey unit, per LTP Section 5.6.3 C. SURVEY RESULTS A total of 48 direct measurements were performed in Survey Unit 4. All direct measurements were below the DCGL. The results are presented in Table 2.ISOCS gamma scans were performed at 62 locations using an investigation level of 1.0 pCi/g Cs-I 37 and 0.36 pCi/g Co-60. In addition, ISOCS gamma scans were performed at 39 locations using an investigation level of 1.0 pCi/g Cs-137 and 0.5 pCi/g Co-60. All identified activity levels were below the investigation levels. Therefore, no investigations were required.LTP Revision 3, Table 5-IC for RCA Yard West, ROIOO.FR-01 11-04, Revision 0 Page 3 of 22 TABLE 2 DIRECT MEASUREMENTS Cs-137 Uncertainty Co-60 Uncertainty Unitized Value of Sample Number (pCi/g) (pCi/g) (pCi/g) (PCi/g) Unity Rule FRO111041SOOIVS

< 5.20E-02 < 6.5713-02 9.82E-02 FRO111041S002VS

< 4.07E-02 < 4.1313-02 6.511E-02 FR0III041S003VS

< 4.71 E-02 < 4.6813-02 7.41E-02 FROI 11041S004VS

< 4.5 11E-02 < 4.76E-02 7.4213-02 FRO11041S005VS

< 4.2713-02

< 4.911E-02 7.5013-02 FROI 1104 1S006VS < 4.90E-02 < 4.88E1-02 7.72E-02 FRO 11041 S007VS < 4.97E-02 < 4.9413-02 7.82E-02 FROI11041SOO8VS

< 4.2313-02

< 4.57E-02 7.0813-02 FROI 104 1S009VS < 4.32E-02 < 4.9313-02 7.54E-02 FROI11041SOIOVS

< 6.04E-02 < 6.45E-02 L.OOE-OI FROI11041SOIIVS

< 4.76E-02 < 4.9813-02 7.78E-02 FRO 111041SOI2VS

< 4.57E-02 < 5.2413-02 8.01 E-02 FRO111041SO13VS

< 5.5713-02

< 4.5813-02 7.66E-02 FRO111041SOI4VS

< 3.96E-02 < 4.2313-02 6.5813-02 FRO111041SOISVS

< 5.49E-02 < 5.48E-02 8.67E-02 FROI11041SOI6VS

' 4.90E-02 < 5.3313-02 8.2513-02 FRO111041SOI7VS

< 6.88E-02 < 5.6013-02 9.39E-02 FRO11041SOI8VS

< 4.9313-02

< 4.9513-02 7.82E-02 FROI 1104 1SOI9VS 1.28E-01 3.4213-02 1.80E-01 2.9313-02 2.64E-01 FRO11041 S02OVS < 4.98E-02 < 5.3013-02 8.25E-02 FRO 11041S02IVS

< 5.0213-02

< 4.6513-02 7.511E-02 FROI 1041 S022VS < 5.36E-02 < 4.9713-02 8.0213-02 FROI 1041S023 VS 5.35E-01 6.8913-02

< 6.56E-02 3.0013-01 FRO I11041S024VS 2.65E-01 5.10OE-02

< 7.0713-02 1.931E-0I FRO I II041S025VS

< 6.311E-02

< 6.4913-02 1.0213-01 FROI 11041S026VS

< 6.7713-02

< 6.3613-02 1.02E-01 FRO11041 S027VS < 6.1213-02

< 7.0613-02 1.0813-01 FRO11041S028VS

< 5.1313-02

_< 5.7813-02 8.8713-02 FRO11041 S029VS 1.08E-01 2.6413-02

< 7.3813-02 1.311E-0I FROI 1104 1S03OVS 7.32E-02 2.7413-02

< 9.2313-02 1.3813-01 FRO111041S03IVS 2.13E-01 4.3313-02

< 6.14E-02 1.6013-01 FRO111041S032VS 1.93E+00 1.52E-01 < 5.78E-02 8.75E-01 FROI 1041S033VS 1.04E+O0 8.6013-02

< 4.8713-02 4.9313-01 FROI11041S034VS 1.44E-01 3.0813-02

< 4.7513-02 1.1613-01 FR0111041SO35VS 1.27E-01 3.311E-02

< 4.6713-02 1.0813-01 FROI 11041S036VS 2.37E-01 5.0313-02

< 6.0913-02 1.7013-0I FROI11041S037VS 2.41E-01 4.3813-02

< 4.8913-02 1.58E-01 FRO111041S038VS 2.36E-01 4.1813-02

< 5.10E-02 1.5813-01 FRO1I1041S039VS 1.78E-01 4.011E-02

< 6.7713-02 1.5313-01 FRO 1 1041S040VS 8.29E-01 8.8613-02

< 6.29E-02 4.2013-01 FROI 11041SO41VS

< 6.9713-02

< 5.7313-02 9.5813-02 FROI I1041S042VS 4.95E-01 5.8513-02

< 5.5813-02 2.7213-01 FRO11041S043VS 1.39E+00 1.1613-01

< 6.4213-02 6.58E-01 FROI 11041 S044VS 1.56E-01 3.9213-02

< 6.1913-02 1.37E-0I FR0111041S045VS 2.74E-01 4.3713-02

< 6.4513-02 1.8913-01 FR-0I1 11-04, Revision 0 Page 4 of 22 Cs-137 Uncertainty Co-60 Uncertainty Unitized Value of Sample Number (pCi/g) (Pcig) (pCi/g) (pCi/g) Unity Rule FROI 1104 1S046VS < 6.70E-02 < 6.73E-02 1.06E-0I FRO I 11041 S047VS 9.60E-02 3.25E-02 < 5.1 l E-02 9.96E-02 FROII 1041 S048VS < 6.56E-02 < 6.22E-02 9.98E-02 Mcan 2.12E-01 5.91E-02 1.58E-01 Median 6.63E-02 5.53E-02 1.OOE-Ol Standard Deviation 3.69E-01 2.04E-02 1.57E-01 Range 3.96E-02 to 1.93E+00 4.13E-02 to 1.80E-01 6.51E-02 to 8.75E-01"<" indicates MDA value. Bold indicates positive detection value.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 5.63/1 0 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 48 soil samples collected, 20 identified Cs-137 activity below the DCGL value of 2.39 pCi/g, and 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 90% 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 (0.212 pCi/g). Taking into account the average residual contamination level for Co-60, the annual dose rate would equate to 0.44 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 6-1 1 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 (0212- 0.19 .05911 to: Annual Dose Rate = 5.63 x +-= 0.44 mrem / y 239 0.86/FR-01 11-04, Revision 0 Page 5 of 22 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. The sample standard deviation is smaller than the design sigma; therefore no additional samples were required.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 DCGL of 2.39 pCi/g for land inside the restricted area. The highest direct measurement (S032VS) was less than 90% of the unitized DCGL.3. A Histogram Plot was also developed based on the unity values. This plot shows a log-normal distribution.

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

("powver")

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 1 land survey area; the FSS results were consistent with that classification.

The direct measurement sample standard deviation was less than the design sigma; therefore, no additional measurements were required.FR-O I 1 1-04, Revision 0 Page 6 of 22 Hi. LTP CHANGES SUBSEQUENT TO SURVEY UNIT FSS The FSS of Survey Unit 4 was designed, performed and evaluated in mid 2004. The design was performed to the criteria of the LTP Revision 3 and Addenda (References 2 and 4). No subsequent LTP changes with potential impact to this survey unit need to be evaluated.

I. 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 was determined for the Sign Test in accordance with the LTP. As presented in Table 2, all direct measurements were less than the design DCGL of 2.39 pCi/g Cs-137 and the unitized DCGL considering Co-60.A Sign Test Summary analysis demonstrated that the Sign Test criteria wvere satisfied.

The direct measurement sigma was less than the design sigma; therefore, no additional measurements were required.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.

The scan survey design for this survey unit was 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 did not identify activity above the scan investigation levels shown in Table 2-2 for those scans performed at 3 meters from the surface or for those scans performed at 2 meters from the surface. Thus, no investigations were required.It is concluded that FR 0111 Survey Unit 4 meets the release criteria of I OCFR20.1402 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 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-O1 11-04, Revision 0 Page 7 of 22 Attachment 1 Survey Unit Maps FR-011 1-04, Revision 0 Page 8 of 22 Alaine Yankee Decommissioning Project Survey p MJMapiD#FRO1 11 U4-SITE Turnover a Flnal Status Survey Survey Area Namne: Site Locator Prepared By: Larry N. Dockins Date: 12/13/04 Lo 1 3oo t4 L.o 7 l ot Lo7 ,5°° t Lo0 7.boo I a, I..3 Ln CO, 0>as CO C)Sr mo N a.up~z 0"4 a~U.~.0~Is.-o o a FR-O1 11-04, Revision 0 Page 9 of 22 Maine Yankee Decomrnissioning Team Survey Type: Charocterization Maine Yankee Decommissioning Project Survey Map Map ID# FROl 11 U4-1NFO Turnover

• Final Status Survey SurveyArea Name: Excavation Depths Prepared By: Larry N. Dockins Date: 7/24/04 MN Z- N N 0 50m FR-01 11-04, Revision 0 Page 10 of 22 Maine Yankee Decommissioning Team Survey Type: Choracterzatloon Maine Yankee Decommissioning Project Survey Map MaP ID# FRO 1I1 U4-DIRECTS Turnover a Final Status Survey Survey Area Name: DIRECTS -VOLUMETRIC Prepared By: Larry N. Dockins Dote: 7/23/04 S012 1,, 3 i S0513 JS050)0 5024 S032 S025 AS037 S048 S014 S033 SV042*S026 V S038* 5046 S015 S034-5043 S027 S039 S01 6 1 035.. 044 S028 S017 S006-S029 S018 5019*S020 S022 FR-01 11-04, Revision 0 Page 11 of 22 Decornmissneannkg Team Maine Yankee Decommissioning Project Survey Map Mop JD# FRO1 11 U4-Scans Survey Type: Characterization Turnover

• Final Status Survey Survey Area Name: Soil Area Scans Prepared By: Larry N. Dockins Date: 7/24/04 S008 MN WI S007)_)-:: 1'1 ,Sol 9 S006 S012 S01 8$s011$ S034 S01 7 s0ol WS025 S016$0 S033$0 S024 S015 S032 5S023 S031 S022 S041 S0 sni_$5040 S021'S029$S039 S028$,/,S038$5QkS37 S036 5'045-'S051 6 , Om FR-0I 11-04, Revision 0 Page 12 of 22 00 O 0 w' <0 N.CD .V)Sn-T 0-2.O 0 9 I-N)

Maine Yankee Decornmissloning Team Maine Yankee Decommissioning Project Survey Map ie #FRO 1 l1U4-TRENCH

-Survey Type: -Charocterization Turnover a Final Status Survey SurveyArea Name: Trench Scans Prepared By: Larry N. Dockins Dale: 7/23/04 1S04 FR-O1 11-04, Revision 0 Page 14 of 22 Attachment 2 Survey Unit Instrumentation FR-OI 11-04, Revision 0 Page 15 of 22 TABLE 2-1 INSTRUMENT INFORNIATION ISOCS Detectors (Field Measurements) l Detector Number MIDC (pCi/g)7607 0.09 to 0.9 7722 0.090to 0.9 IlPGe Detectors (Laboratory Analysis)Detector Number MDC (pCi/g)FSS1 0.05 to 0.11 FSS2 0.05 to 0.1 1 TABLE 2-2 INSTRUMENT SCAN MDC, DCGL, INVESTIGATION LEVEL, AND DCGLEMsC Detector Instrument Comments ]Scan MDC ISOCS: 0.09 to 0.9 pCifg <DCGL 2.39 pCi/g Cs-137 Approved DCGL for land areas DCGL 2.39pig o6 inside the Restricted Area L0.86 pCi/g Co-60 (Reference 4)Investigation Level 1.0 pCi/g Cs-137 Reference 6 (ISOCS @ 3 m) 0.36 pCi/g Co-60 Reference_6__

Investigation Level 1.0 pCi/g Cs-137 (ISOCS @ 2 m) 0.5 pCi/g Co-60 4.25 pCi/g Cs-137 DCGL x Area Factor for Class 1 Design DCGLE 3 Ic 1.53 pCi/g Co-60 survey unit, per LTP Section 5.6.3 FR-OI 11-04, Revision 0 Page 16 of 22 Attachment 3 Investigation Table (No Investigations Required)FR-0I 11-04, Revision 0 Page 17 of 22 Attachment 4 Statistical Data FR-0I 11-04, Revision 0 Page 18 of 22 Survey Package FRO1I1 Unit 4 UNITY Soil Sign Test Summary tt-- O tvlaion In put~ala is - ' ;c-._Cornm c;;-en;-Survey Package: FRO111 Yard West Excavations Survey Unit: 04 Evaluator:

DA DCGL,: 1.OOE+00 Unity DCGLmn: 1.78E+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__ __ __ __ __ __ _ a' C m r e ts.Zo: 1.645 ZI.P: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.; .; -'-iDaa -...or' , nJmentuhi

'I Number of Samples: 48 Median: 1.00E-01 Mean: 1.58E-01 Net Sample Standard Deviation:

1.57E-01 Total Standard Deviation:

1.57E-01 Sum of samples and reference Maximum: 8.75E-01 tign ;. .ornmn Adjusted N Value: 48 S+ Value: 48 Critical Value: 30 Sign test results: Pass on ^ o aV-.'.. Cmmentw;Sufficient samples collected:

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

Pass Total Standard Deviation

<=Sigma: Pass Criteria comparison results: Pass-*4~r u ______________________._

_omen_ _?The survey unit passes all conditions:l Pass Survey Unit Passes FROI 1 1-SU4-Soi1Sign-UN1TY.xls 12117104 2:04 PM FR-0 I 1 1-04, Revision 0 Page 19 of 22 FR-01 1 1 SU-4 Quantile Plot In 0 6 tr -0 0-Q n ws <.J ~.0 0l 0-%la N._._,-'._._1 0.9 0.8 0.7 0.6 0.5 0.4 0.3 0.2 0.1 0 4 4l

• Activity (unitized)

-Median (unitized)

.. .-..I'*.-1 0 25 I-50 Percent 75 100 One-Sample T-Test Report Page/Date/Time 2 12/15/04 4:24:33 PM Database Variable C2 Plots Section Histogram of FR-0111, SU4 so, ,n') 38 E C,)o 25 C).0=E Z 13 i: n .l 0.000 0.25<0.500 Activity (unitized 0.750 1.000 FR-01 1-04, Revision 0 Page 21 of 22 One-Sample T-Test Power Analysis Page/Date/Time 2 12/15/04 4:25:19 PM Chart Section a)0 0L 1.0-0.8-0.6-0.4 0.2-0.0 _0.1 Retrospective Power Curve.-----.-I I 0 I 0X3 0:5 0.7 Survey Unit Mean (unitized) 0:9 1.1 FR-0I 11-04, Revision 0 Page 22 of 22