ML043640317

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Maine Yankee Final Status Survey Release Record FR-0400 Forebay Survey Unit 8
ML043640317
Person / Time
Site: Maine Yankee
Issue date: 12/22/2004
From: Cooper W J, Pillsbury G, Randall D B, Tozzie N
Maine Yankee Atomic Power Co
To:
NRC/FSME
References
MN-04-060, RA-04-118 FR-0400-08, Rev 0
Download: ML043640317 (23)
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MAINE YANKEE FINAL STATUS SURVEY RELEASE RECORD FR-0400 FOREBAY SURVEY UNIT 8 Prepared By: 24- 1 , Date: // 94 FSSEngineer-Signature PrinXtd Nam Reviewed By: _ _ _ ___ _ _ /Ie- Date: 1//lI Xll 4 F ,* RevieALSjignature Printed Name/Reviewed By: _ Date: /a b4 ppd~egeineview

-Signature Approved By: __ _ __ _Date: i/Syerntendent lS~Snature

/Printed Name /Approved By: fi Date: H^FSS, MOP -Signature Printed Name Revision 0 MAINE YANKEE FINAL STATUS SURVEY RELEASE RECORD FR-0400 FOREBAY SURVEY UNIT 8 A. SURVEY UNIT DESCRIPTION Survey Unit 8 is located within Survey Area FR-0400, the Forebay. The Forebay is located south of the radiologically Restricted Area of the site at coordinates 407,000 N and 623,700 E (see map FR 0400 SITE, Attachment 1). The Forebay is a large, rock-lined basin in which condenser cooling water collected prior to its release through the diffuser system out to the ocean. During plant operation, the Forebay/Diffuser System was the licensed discharge path for liquid, radiological effluent.

After plant shutdown, stop logs were set in place at the Forebay end of the diffuser to isolate the Forebay in order to prevent the release of Forebay sediment into the river during remediation activities.

Two earthen dikes make up the north-south running walls of the Forebay with concrete walls at the extreme north and south ends to support the circulating water and diffuser pipes. The dike walls form a V at the southern end of the Forebay (adjacent to Foxbird Island). The diffuser discharge pipes originate at the notch of the V. A concrete dam, or weir, runs in the east west direction at the northern end of the Forebay and creates a small, water-filled area called the sealpit. The sealpit maintained a water seal over the circulating wvater pipes to prevent loss of flow with tidal fluctuations.

Survey Unit 8 consists of the interior of the east dike of the Forebay. This is inclusive of a rip-rap layer, sediment and ledge. The area is bounded on its southern extent by the discharge canal, and by the weir to the north. The area includes both above water and submerged portions from the top to bottom (toe) of the slope. The Survey Unit has a total surface area of approximately 1,525 m 2.B. SURVEY UNIT DESIGN INFORMATION The Forebay received the liquid radioactive discharges from the plant. It was known to have been contaminated to levels in excess of the release limits and extensive remediation activities including underwater dredging, undervater vacuuming, and dry surface vacuuming were performed.

Given the high probability of residual contamination, the Forebay was classified as Class 1.Revision 3 of the Maine Yankee License Termination Plan (LTP)' states that the Forebay dose from residual radioactivity "is so insignificant and the probability so low that an individual would be able to successfully place a viable well within the Forebay, survey measurements of the Forebay surfaces including rip-rap will be limited".

As a result, the survey design for the Forebay is a reasonable approach to demonstrate compliance with the release criteria while not necessarily meeting all of the requirements for a "MARSSIM" survey.LTP, Revision 3 refers to the LTP submitted in October 2002 (Reference I) as amended by the MY's addenda of November 2002 (Reference 2). LTP, Revision 3 was approved by the NRC in February 2003 (Reference 3).FR-0400-08, Revision 0 Page 2 of 23 The survey unit design parameters are shown in Table 1. The values shown in this table reflect those used for the design and implementation of the survey. Changes to several key parameters (i.e., DCGL and AF) occurred after the survey was complete.

These changes were used to evaluate the data, are discussed in Sections G and H, and shown in Table 2-2.Given a relative shift of 1.6, a minimum number of 17 direct samples were required per the Sign Test. The survey design was based on twenty samples. Twenty-one actually fell within the survey unit. Each sample measurement location was determined using a random start point and a square grid. These locations are presented on survey maps FR 0400-8, FR 0400-8a, and FR 0400-8b (Attachment 1). Direct measurements located above the waterline consisted of soil samples analyzed with laboratory gamma spectroscopy instrumentation.

Measurements located below the waterline were obtained with in situ gamma spectroscopy (ISOCS).In situ gamma spectroscopy was used to conduct 100% scan of the area. The survey unit design used the ISOCS portable high purity germanium detector system to perform both underwater and above-water scans. The submerged individual scan grids were 4 mi 2.Grids above wvater and below the "bathtub ring" wvere 12 m 2.Grids above the "bathtub ring" were 28 mi 2.The "bathtub ring" was the area of high water in the Forebay during plant operation.

The ISOCS detector was positioned with the aid of a prefabricated track and trolley system for measurements below water. Above water measurements were located utilizing a pre-established grid system. This scan survey ensured there were no areas exceeding the design DCGLENIC limit. The survey instruments used, their MDC values, and investigation levels are provided in Attachment 2.TABLE 1 SURVEY UNIT DESIGN PARAMETERS Survey Unit l Design Criteria l Basis Area 1,525 ml Based on an LBGR of 3.5 pCi/g Number of Direct Co-60, a sigma 2 of 2.18 pCi/g Measurements Required 17 (20 used) CO-60, and a relative shift of 1.6.Type I = TypeII = 0.05 Sample Area 76.3 ml 1,525 m_ / 20 Sample Grid Spacings 8.5 m (76.3)'Area Factor (AF) 10 Scan Survey Area 1,525 m' in00%Background N/A In situ gamma spectroscopy used Scan Investigation Level See Table 2-2 Less than DCGLEMIC DCGL 7.0 pCi/g Co-60 Forebay Technical Basis Document________________

_ 70.0__Co-60

__ A(Reference 4)DCGLENIC 70.0 pCi/g Co-60 Area Factor x DCGL 2 Sigma was determined using post remediation survey results.3 A sample spacing of 8.5 m was used in the final design. This is conservative and generated 21 Direct Points when the grid was laid out on the SU maps.FR-0400-08, Revision 0 Page 3 of 23 C. SURVEY RESULTS As designed, 21 direct measurements were obtained.

Eighteen measurements consisted of soil samples. Three measurements were obtained in situ with the ISOCS detector.

The direct measurement data are presented in Table 2 below. All sample measurement results wvere less than the DCGL.The scan process wvas performed in accordance with FSS requirements using in sit gamma spectroscopy.

To achieve approximately 100% scan coverage, 185 ISOCS measurements were obtained.

The process identified no locations in excess of the investigation level;therefore, no investigations were required.TABLE 2 DIRECT MEASUREMENTS Cs-137 Co-60 1 Unitized Value Sample Number (pCi/g) (pCi/g) l of Unity Rule FRO400081SOOISS 2.28E-01 42.88E-02 2.74E-01 +/-2.44E-02 7.35E-03 FR0400081 S002SS 1.46E-01 + 3.15E-02 1.65E+00 +/- 8.40E-02 3 .53E-02 FR040008 I S003SS 3.03E-01 + 3.57E-02 1.34E+00 + 6.59E-02 3.01 E-02 FRO400081SO04SS 3.17E-01 +/- 3.84E-02 3.37E+00 + 1.53E-01 7.25E-02 FRO40008IS005SS

< MDA r5.51E-02

1.78E-02 1. 15E-03 FR0400081S006SS 1.28E-01 +.2.02E-02:

4.66E-02 +/-1.23E-02 1.89E-03 FRO400081SO07SS 2.33E-01 d'3.05E-02 1.47E-01 + 2.10E-02 4.73E-03 FRO400081 S008SS 1.43E-01 4 2.75E-02 < 7.59E-02 2.61 E-03 FRO400081SO09SS

< MDA < 3.03E-02 6.31 E-04 FR0400081 SO I OSS 1.28E-O1 : 2.48E-02 3.20E-01 +/- 2.91E-02 7.5813-03 FRO40008I SO I I SS 1.34E-01 +/- 2.41E-02 5.57E-01 +/- 3.60E-02 1.26E-02 FR0400081S01S2SS 2.28E-01 h 3.24E-02 1.47E+00 + 7.51E-02 3.23E-02 FRO400081SO13SS 2.02E-01 + 4.09E-02 3.91E-01 4.15E-02 9.60E-03 FR0400081S014SS 1.08E-01 h 2.68E-02 <4.93E-02 1.8013-03 FR0400081 SO I5SS 2.33E-01 +/- 4.99E-02 1.12E+00 + 8.36E-02 2.50E-02lR0400081 SO16SS 3.74E-01 + 5.78E-02 1.65E+00 + 9.99E-02 3.7013-02 FR040008 ISO I 7SS 3.22E-01 +/- 3.24E-02 1.47E-01 + 1.89E-02 5.39E-03 FR0400081 SO18SS 1 .30E-01 +/- 2.35E-02 7.28E-02 + 2.51E-02 2.45E-03 FR040008 1 RO 191G < MDA < 2.28E+00 4.75E-02 FRO400081 R020IG < MDA < 4.98E+0o 1.04E-0 I FR040008 1 R02 I IG < MDA < 4.08E+00 8.49E-02 Mean 1.60E-01 1.15E+00 2.50E-02 Median 1.43E-01 3.91E-01 9.60E-03 Standard Deviation 1.17E-01 j 1.45E+00 2.99E-02 Range O.OOE-00-3.74E-01 3.03E-02-4.98E+00 6.31E-04-1.04E-Ol NOTES 1. All values in bold are positive detection values.2. "<" indicates MDA value for non-detect Co-60 results.3. "< MDA" indicates non-detect for Cs-137 results. Refer to Section E for additional discussion.

4. The unitized values were adjusted to account for the contamination depth used in the excavation scenario (60 cm). Refer to Section E for additional discussion.

FR-0400-08, Revision 0 Page 4 of 23 D. SURVEY UNIT INVESTIGATIONS PERFORMED AND RESULTS No measurements exceeded the investigation level. Therefore, no investigations were required.E. SURVEY UNIT DATA ASSESSMENT The Forebay dike soil DCGL was developed assuming that a 2-foot (24") band of soil contamination at the DCGL exists underneath the rip-rap in the Forebay dikes. This 2-foot assumption was arbitrarily made based upon a minimum amount of data. In order to determine the actual extent of contamination within this band of soil, Maine Yankee performed extensive characterization using samples obtained from incline core bores beneath the rip-rap. The samples were obtained as close to the rip-rap as possible.

Overall, the Forebay dike soil boring campaign showed that the radiological contamination had not penetrated into the Forebay dikes beyond the rip-rap to any substantial depth (likely less than several inches).ISOCS measurements of the Forebay dike soil through the rip-rap were geometrically configured such that the entire photon spectra was attributed to a contaminated soil band of 6 inches. Thus, this activity, attributed to a 6-inch band, should be divided by a factor of four in order to appropriately compare the results to a DCGL which was developed assuming a 24-inch band of contaminated soil. This adjustment, also applicable to ISOCS measurements above the rip-rap and soil samples obtained at depths of 0" to 6", is justified since the Forebay dike core boring campaign demonstrated that the contamination had not penetrated into the Forebay dike beyond the rip-rap to any significant extent. Therefore, the results for FR-0400 Survey Unit 8 were evaluated as discussed above.An analysis of the direct sample measurement results, including the mean, median, standard deviation, and sample result range, are provided in Table 2. Positively detected values are bolded in the table. Since Co-60 is the primary radionuclide of concern, non-detect values were assumed to be present at the MDA. Non-detect values for Cs-I 37 were assumed not to be present.The sampling results yielded fourteen measurements which detected both Co-60 and Cs-137, two measurements with only Cs-1 37, one measurement with only Co-60, and four samples with no plant-derived activity detected.

The right hand column in Table 2 is the DCGL unity column. The survey unit mean value in this column indicates that the direct measurements were at 2.5% of the DCGL limit. No direct measurements exceeded the unitized DCGL.The sigma for the direct measurements was also evaluated and determined to be less than the design sigma. This indicates that a sufficient number of samples were taken.No scan (ISOCS) locations exceeded the investigation level and, therefore, no investigations were performed.

FR-0400-08, Revision 0 Page 5 of 23 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 established mean fallout Cs- 137 background value of 0.19 pCi/g (Reference

5) for disturbed soil from the survey unit mean (0.19 pCi/g/4 = 0.05 pCi/g) yields a negative value which is equivalent to 0.0 mrem/y. Since there is no background value for Co-60, the annual dose contribution from this radionuclide is 0.2 mrem/y ( = 1.15 pCi/g/4 x 1/12 pCi/g x 9 mrem/y). However, for the purposes of demonstrating compliance with the radiological criteria for license termination and the enhanced State criteria, background activity is not subtracted from the 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 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 direct measurement 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 wvell below the DCGL of 12.01 pCi/g Co-60 and 34.76 pCi/g Cs-137.3. A Histogram Plot wvas also developed based on the direct measurement values. This plot shows that the direct data were essentially a skewed distribution with no 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 THE EXTENT OF RESIDUAL ACTIVITY The dose model originally assumed 24 inches of contaminated soil behind the rip-rap on the dike walls. Based on data from the core boring campaign, the depth was 2 inches or less.The ISOCS results were divided by 4 to adjust the depth to 6 inches. In addition, the entire 10 mrem/y was assumed because there were no other contributing sources.FR-0400-08, Revision 0 Page 6 of 23 It. LTP CHANGES SUBSEQUENT TO SURVEY UNIT FSS The FSS of Survey Unit 8 was designed and performed using the criteria of the approved Forebay Technical Basis Document (Reference

4) and LTP Revision 3 Addenda (Reference I and 2). Subsequent LTP changes have been evaluated and have no impact on the design, conduct, or assessment of the final status survey of this Survey Unit.However, during final data evaluation, Survey Unit 7 (FR-0400) had issues related to the EMC Unity Rule criteria.

As a result, the Forebay soil excavation scenario was modified to increase the Forebay soil DCGL to a value which was equivalent to the entire 10 mrem/y (9 actually used) limit allowed for soil outside the Restricted Area. This change raised the DCGLs for the Co-60 and Cs-137 to 12.01 pCi/g and 34.76 pCi/g respectively.

These changes are documented Reference

6.1. 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 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 12.01 pCi/g Co-60 and 34.76 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 skewed distribution, with variance consistent with expectations for a Class I survey unit.The scan survey design for this survey unit was developed in accordance with the Forebay Technical Basis Document with significant aspects of the design discussed in Section B and Table 1. No areas of elevated activity were detected during the scan process; therefore no investigations were required.It is concluded that FRO400 Survey Unit 8 meets the release criteria of 1OCFR20.1402 and the State of Maine enhanced criteria.FR-0400-08, Revision 0 Page 7 of 23 J. REFERENCES

1. Maine Yankee License Termination Plan, Revision 3, October 15, 2002 2. Maine Yankee letter to the NRC, MN-02-061, dated November 26, 2002 3. NRC letter to Maine Yankee, ated February 28, 2003 4. Maine Yankee letter to the NRC, MN-03-05 1, "Forebay Technical Basis Document," dated September 3, 2003 5. Approach for Dealing with Background Radioactivity for Maine Yankee Final Status Surveys, Attachment E to Maine Yankee Procedure PMP 6.7.8, FSS Data Processing and Reporting 6. Maine Yankee Calculation EC-04 1-01, Diffuser and Forebay Dose Assessment
7. Maine Yankee Calculation EC-003-04, Use of Canberra In Situ Object Counting System (ISOCS) for FSS Surveys FR-0400-08, Revision 0 Page 8 of 23 Attachment I Survey Unit Maps FR-0400-08, Revision 0 Page 9 of 23 Maine Yankee Aaine Yankee Decommission in. Proect Surve. Form Map ID#: FR 0400 SITE Decommissioning Team Ig J Revised: 12-16-04 Survey Type: [ Remediation 0 Turnover
  • Final Status Survey Survey Area Name: Forebay Site Map-SURVEY AREA (PARTIAL), FR 0400 623,000 E 623.500 E 624,000 E 624,500 E 625,000 E ao o 0 0 0 8 8 z § 8 §z z z z z z SCALE 0 400 800 1200 Note: Grid based on Maine State Coordinate System (West Zone) NAD 1927 MN E~~ N FR-0400-08, Revision 0 Page 10 of 23 z ad a'-5 9 O- 0 >ca C O V5 co LL mW o W a Lu 2 IL D) LL a c 0 9 o 2 _a 8 t svr ., nowa"n. _.. ..1 a,=3 C,)LIDCIN.........

.. LEP).... e. P".5016 DctePtLaom

_ _N Maine Yankee lMaine Yankee Decommissioning Project SurMey Form Map ID A FR 0400-08a Decommissionin Team I Revised: 11-04-03 Survey Type: 0 Characterization 0 Turnover E Final Status Survey Survey Area Name: Forebay, East Dike Survey FR 0400: FOREBAY Unit 8, North Section of East Bank Direct Points SOO1 -S012...a .... .FOREBAY-- S04 1 2 .tS---_*. -..W8S-S005.~SO04~SQO8 .s 5 5[S004--- .. % -.S(03)02.002!s i 4;:S+AN LECEND Rck Bu* Ek4d_ P.Rp Ewf M" Bm)...............

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4...j .!" I S 4.R020 --"R01 9 s014 N.4..4 Xe 4.-N GAMSAPUG-6tjmk~~,4--x S013 " LEGEND RaO& Bankx~... .RM aff ,aw Rm)...............

...Led" B.5m (1) Squ" &W*W016 Dhdt PokW Location FR-0400-08, Revision 0 Page 13 of 23 LSg.5,N=20 SA 1S252sqmn Scale: 1m Scule:1'.3O' Maine Yankee MaieDYPcommsongProject Survey Form map ID#-. FR0400-0c Decommissioning Team ,MIneeom-on~

Revised: 12-16-04 Survey Type: 0 CharacterIzation O Tumover IN Fhial Status Survey ISurvey Area Name: Forebay, East Dike FR 0400: FOREBAY Survey Unit 8, North Section of East Bank Underwater ISOCS Frames 23 thru 27 I I ] I j Ad cat Fru. Pacuw I I I I'I Twesy PW Tr I NileyP.~ m 9 I TrCA~y Pcsaimi.14--l I_1I I_ 1I I I11 I11 1-2.t .., \ W -FOREBAY l-.-'YPICAISOCSUNDERWATER LOCATION s(LOOEqNATSLOPE) io uth MOM- W@=: ,_AdS^e 3 %I-I.- -= --- S--. = I-*.- ap^ -,_N LEGEND Rock Bi* AwA__ __ P -E~~~ u ROAp Exeb(ak Bot)...............

LodgeL_ A M Rai aftamoCSCM.

FR-0400-08, Revision 0 Page 14 of 23 SA nl1525 sqm Scale:1".3 Maine Yankee Decomisionng eam Maine Yankee Decommissioning Project Survey Form Map ID*#FR 0400-08 Decomissonin Tea I IRevised:

12-16-04 Survey Type: 0 Characterization 0 Tumover 1 Fhial Status Survey I Survey Area Name: Forebay, East Dike FR 0400: FOREBAY Survey Unit 8, South Section of East Bank Underwater ISOCS Frames 17 thru 22 DI.FUSER INTAIKE \ -......STRUCTURE

;; <n-rn ---1 --I I I I I I I.I I L 10 ----I. Tme VI en" I T -t I k.f"X-- ...FOREBAY 17 " S\ \.19 -.S0 I I! 4. , 4 TYPICAL MOCS UNDERWATER LOCATION (LOONCG AT SIODP)2 LEGEND Rock BkE..-._ _ f Bb BW* BO)...............

Ledge Apo Gr MM Ral SCRSpef S P .FR-0400-08, Revision 0 Page 15 of 23 SA ' 1525 sqrn Scale:1'.

Attachment 2 Survey Unit Instrumentation FR-0400-08, Revision 0 Page 16 of 23 TABLE 2-1 INSTRUMENT INFORMATION ISOCS Detectors (in situ measurements)

I Detector Number MDC (pCilg)j 7605 1 Table 2-2 1 7607 5 Table 2-2 HPGe Detectors (Laboratory Measurements)

Detector Number I MDC (pCi/g)j FSS-I 0.10 nominal I FSS-2 I 0.1 o nominal 7d TABLE 2-2 INSTRUMENT SCAN MDC, DCGL, INVESTIGATION LEVEL, AND DESIGN DCGLEMC Detector ISOCS I Comments Scan IDC MDC <35 pCilg Co-60 See Note I____ ____ ____ ____ ____(nom inal)DCGL 12.01 pCi/g Co-60 34.76 pCilg Cs-137 Reference 6 Investigation Level DCGL < DCGLEMc 16.8 pCi/g Co-60 DCGL x 1.4 Design DCGLENIC 47pigCs 37(1.4 is the actual AF for 48.7 ~ilg s-137 surface soil, LTP Table6-2 NOTE I The effective activity for non-detect Co-60 is 25% of the reported MDC as discussed in Section E.FR-0400-08, Revision 0 Page 17 of 23 Attachment 3 Investigation Table (No Investigations Required)FR-0400-08, Revision 0 Page 18 of 23

...Attachment 4 Statistical Data FR-0400-08, Revision 0 Page 19of23 Survey Package FR-0400 Unit 8 UNITY Soil Sign Test Summary Ionpnput Va uesg, \ min Survey Package: FR-0400 Forebay Survey Unit: 08 Evaluator:

GP DCGL.: 1 .OOE+00 DCGLem: 1 .40E+00 LBGR: 5.OOE-01 Sigma: 1.82E-01 Unitized Type I error: :0.05 Type II error: 0.05 Nuclide: UNITY Soil Type: N/A"-: :; -*t : f1645 zr5Il5l4 *t >1645 Sign p: -,-' 0 99379 Calculated Relative Shift: A ,2.7 Relative Shift Used: ,- .,. 27 Uses 3.0 if Relative Shift is >3 N-Valu e: ..', ' 1 2 N-Value+20%:

.15 W;S;',~rh; plO,&1ata-s~ls.,.ii..-W'.Si' Number of Samples: , ,, ': o21 Median: ; ;-§i '9.60E-03 Mean: $' 2 50E-02 Net Sample Standard Deviation:

' 5`3.00E 02 Total Standard Deviation:

63 00E 02 SRSS Maximum: t I 04E-0l Adjusted N Value: -, 21 S+ Value: i Critical Value: ,2*i,, '44;T Sign test results: , ,°Vas-= 'rie,[a Sti~tl~f~a{ci",4o n N & : ^Sufficient samples collected:

rj vPass Maximum value <DCGL,: 5 N s Median value <DCGL.: .^. Pass Mean value <DCGLF,: Pass Maximum value <DCGL,.: .____*Total Standard Deviation

<=Sigma: ass Criteria comparison results: iss Nomm ns 2 The survey unit passes all conditions:

.<-.> Pass FR-0400-SIU8-SOiSign-LINITY 11/16/04 10:49AM FR-0400-08, Revision 0 Page 20 of 23 FR-0400 SU-8 Quantile Plot 0 17 R e 0 w O Or X W (Al 5'TO 0 0.4-.Cu:w 1 .20E-01 I .OOE-01 8.OOE-02 6.OOE-02 4.OOE-02 2.OOE-02 O.OOE+00* Activity (unitized)

Median I (unitized)

-* ..*0 25 50 75 100 Percent Page/Date/Time Database Variable One-Sample T-Test Report 2 12/20/04 5:11:20 AM C:\Program Files\NCSS97\FR0400SU-8.S0 C2 Plots Section Histogram of FR-0400, SU-8 E Co 0 0 E z Activity (unitized)

FR-0400-08, Revision 0 Page 22 of 23 One-Sample T-Test Power Analysis Page/Date/Time 2 12/20/04 5:12:14 AM Chart Section Retrospective Power Curve 1.0 0 0.8 -... .- .-z30.6 -.--** -0 0.4- .-.....-..-

0.2 ..... -----0.0 I 0.0 0.2 0.4 0.6 0.8 1.0 Survey Unit Mean (unitized)

FR-0400-08, Revision 0 Page 23 of 23

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