ML081580577
| ML081580577 | |
| Person / Time | |
|---|---|
| Site: | Rancho Seco |
| Issue date: | 04/01/2008 |
| From: | Sacramento Municipal Utility District (SMUD) |
| To: | NRC/FSME |
| References | |
| MPC&D 08-032 | |
| Download: ML081580577 (26) | |
Text
Rancho Seco Final Status Survey Summary Report April 1, 2008 South Retention Basin Survey Unit F8480012 Prepared By: CC45Date:_
FS ei er Reviewed By:
.D.t.:../.
Date:
LeadSa S Engineer Approved By:
6S -Date:
Dismantlement S~perintendent, Radiological
FINAL STATUS SURVEY
SUMMARY
REPORT Survey Unit:
F8480012, South Retention Basin Survey Unit
Description:
Operating History: This area is located at the southwest comer of the site. The area surrounds the structures that were used for containment and final treatment of liquid effluents prior to their release from the site. Contaminated resin was reported to have been found in the basins. Operating records and the HSA document occurrences of radioactive material with the potential fora release of radioactivity associated with this survey area. Records confirmed the presence of radioactive material within the area and basin sediment/soil contamination levels up to -290 pCi/g. In addition, soil contamination levels up to -5 pCi/g prior to some decontamination activities.
Site Characterization: Soil samples were collected and showed Cs-137 at mean activity levels of 0.086 pCi/g and a maximum activity of 0.196 pCi/g. Based on the classification
.procedure (DSIP-0020) and levels of gross activity reported, the soil area around the asphalt was determined to be Class 3.
HSA Events: LER-8812.
Survey Unit Design Information:
The Survey Unit Design Parameters are presented in Table 1 below. The survey unit and measurement locations are depicted on the maps in Attachment 1. Direct measurement locations were determined using a random-start, fixed grid pattern and 1388 m2 were scanned for approximately 100% coverage. Soil samples were collected at each direct measurement location and analyzed by HPGe detector. The instrumentation used for the survey along with the MDC values are listed in Tables 2-1 and 2-2 in Attachment 2.
Page 2 of 8 FSS Summary Report F8480012
Table 1. Survey Unit Design Parameters Survey Design Parameter Value Comment Survey Area:
F848 South Retention Basin Survey Unit:
0012 Open Land Area Class:
1 LTP Table 5-4 SU Area (m2):
1388 Evaluator:
Gary Frank DCGL for Cs-137 surrogate (pCi/g):
52.6 DCGL for Co-60 (pCi/g):
12.6 Area Factor:
1.2 Class 1 Design DCGLemc (pCi/g):
64.8 Class 1 LBGR (pCi/g):
25.6 Adjusted Design Sigma (pCi/g):
0.49 DTBD-06-001, Table 5-4A or B Type I Error:
0.05 Type II Error:
0.05 Sample Area (m2):
99.1 Class 1 Total Area Scanned (m2):
1388 Scan Coverage (%):
100%
Class 1 1.645 Zl.* :
1.645 Sign P:
0.99865 Calculated Relative Shift:
55.1 Relative Shift Used:
3 Uses 3.0 if Rel Shift >3 N-Value:
11 Design N-Value + 20%:
- 14. NUREG-1575 Table 5-5 Grid Spacing L:
10 Class 1 Page 3 of 8 FSS Summary Report F8480012
Survey Results:
A total of 21 direct measurements were made in F8480012. The results are shown in Table 2-1. Statistical data including the mean, median, and standard deviation are shown in Table 2-2. All of the direct measurements were less than Unity. None of the scan measurements indicated areas of elevated activity. Soil samples were counted to the MDCs shown in Table 2-1 of Attachment 2.
In situ gamma spectroscopy (ISOCS) was performed on the soil os the floor of the basin.
Forty-five ISOCS scans were made and the maximum as left value for Cs-137 was 2.62 pCi/g and for Co-60 0.238 pCi/g. In addition, 116 scan measurements were performed with the 2350-1 and 44-10 detector to look for discrete particles in the basin floor, walls, and trench which resulted in 100% coverage. One scan grid (Grid 98) showed initial soil activity greater than the DCGLw. Seventy-nine of the particle scans had count rates greater then the investigation criterion of 9300 c/m. Grids exceeding the investigation criteria were sampled and evaluated as shown in Table 3-1. Initial results greater than the DCGLw (Grid 98) was remediated and sampled at depth to ensure there was no downward migration of activity, Page 4 of 8 FSS Summary Report F8480012
Table 2-1. Direct Measurement Results (all activity values in pCi/g)
Sample ID MDA Activity Uncertainty Value MDA Activity Uncertainty Value Unital F8480012S0001SS 8.19E-02 3.42E00 1.80E-01 0.0651 4.88E-02 3.06E-01I 5.07E-02 0.0243 0.0893 F8480012S0002SS 6.76E-02 5.77E-01I 8.08E-02 0.011 8.92E-02
<8.92E-02 0.0071 0.018 F8480012S0003SS 3.9 1E-02
<3.9 1E-02 0.0007 4.09E-02
<4.09E-02 0.0032 0.004 F8480012S0004SS 8.00E-02 8.27E 9.98E-02 0.0157 5.63E-02 9.93E-02 3.40E-02 0.0079 0.0236 F8480012S0005SS 6.03E-02 3.27E-01 6.08E-02 0.0062 7.72E-02
<7.72E-02 0.0061 0.0123 F8480012S0006SS 7.2 1E-02 1.42E00
- 1. 18E-0 1 0.0271 7.48E-02 2.26E-0 1 4.8 1E-02 0.0179 0.045 F8480012S0007SS 7.25E-02 1.84E00 1,32E-01 0.0349 5.17E-02 8.72E-02 3.23E-02 0.0069 0.0419 F8480012S0008SS 1.23 E-01 9.30E00 3.01 E-0 1 0.1768 7.48E-02 6.67E-01I 7.25E-02 0.053 0.2298 F8480012S0009SS 6.22E-02 4.09E-01I 6.79E-02 0.0078 8.07E-02
<8.07E-02 0.0064 0.0'.142 F8480012S0010SS 4.90E-02 1.08E-01
'4.02E-02 0.0021 5.43E-02
<5.43E-02 0.0043 0.0064 F8480012S001ISS 6.28E-02 1.39E00
- 1. 15E-0 1 0.0263 5.43E-02 1.81E-01 3.95E-02 0.0144 0.0407 F8480012S0012SS 5.98E-02 6.75E00 2.23E-01 0.1283 5.03E-02 2.18E-01 3.88E-02 0.0173 0.1456 F8480012S0013SS 6.76E-02 1.57E00 1.23 E-01 0.0298 1.06E-01I
<1.06E-01 0.0084 0.0382 F8480012S0014SS 4.14E-02 1.96E-01 4.39E-02 0.0037 4.64E-02
<4.64E-02 0.0037 0.0074 F8480012S0015SS 7.4 1E-02 1.37E00
- 1. 17E-0 1 0.0261 7.80E-02
<7.80E-02 0.0062 0.0323 F8480012S0016SS 4.86E-02
<4.86E-02 0.0009 4.69E-02
<4.69E-02 0.0037 0.0046 F8480012S0017SS 6.55E-02 8.72E-0 1 9.2 1E-02.
0.0166 3.74E-02
<3.74E-02 0.003 0.0195 F8480012S0018SS 1.37E-01 2.08E01I 4.57E-01 0.3952 6.73E-02 3.28E-01 5.74E-02 0.026 0.4212
. F8480012S0019SS 8.25E-02
<8.25E-02 0.0016 3.67E-02
<3.67E-02 0.0029 0.0045 F8480012S0020SS 5.86E-02
<5.86E-02 0.0011 5.10OE-02
<5.10OE-02 0.004 0.0052 F8480012S002ISS 5.34E-02
<5.34E-02 0.001 4.96E-02
<4.96E-02 0.0039 0.005 P~age 5 of 8 FSS Summary Report F8480012
Table 2-2. Direct Measurements Results Summary Cs137 Co60
';j% ~
Activity Activity Cs137 Unity Co60 Unity Unity Total, (pCi/g)(p i)
DCGLw 52.6 12.6 Mean 2.45E00 1.38E-01 0.0466 0.011 0.0576 Median 8.27E-01 8.07E-02 0.0157 0.0064 0.0195 Standard Deviation 4.82E00 1.50E-01 0.0915 0.0119 0.0999 Cs137 Activity Range (pCi/g) 3.91E-02 to 2.08E01 Co60 Activity Range (pCi/g) 3.67E-02 to 6.67E-01 Cs137 Unity Range 0.0007 to 0.3952 Co60 Unity Range 0.0029 to 0.053 Total Unity Range 0.004 to 0.4212 Sample Count 21 Survey Unit Data Assessment:
The survey design required 21 direct measurements for the Sign Test. The critical value and the results of the Sign Test are presented in Table 3. The sample mean and median values were less than the DCGL. The sample standard deviation was less than the design standard deviation so no additional samples were required.
Page 6 of 8 FSS Summary Report F8480012
Table 3. Data Assessment Results Survey Results Parameter Value Comment Actual Direct Measurements (N):
21 Median (Unity):
0.020 Mean (Unity):
0.058 Direct Measurement Std Deviation (Unity):
0.100 Maximum (Unity):
0.421 Sign Test Final N Value:
21 S+ Value:
21 Critical Value:
14 Sufficient Samples Collected:
Yes Maximum Value -< Unitized DCGL:
Yes Median Value < Unitized DCGL:
Yes Mean Value < Unitized DCGL:
Yes Maximum Value < DCGLemc (Unity):
Yes Class 1 Standard Deviation <= Sigma:
Investigate Cs-137/Co-60 <0.5 DCGLw Pass the Sign Test?
Yes Reject the Null Hypothesis?
Yes Does the Survey Unit Pass All Criteria?
Investigate Survey Passes Page 7 of 8 FSS Summary Report
- F8480012
Survey Unit Investigations and Results:
Seventy-nine investigations were required for the scan measurements and the results are reported in Attachment 3. The EMC unity rule was not exceeded as shown in Table 3-1.
ALARA Statement:
As stated in Chapter 4 of the LTP, as long as the residual activity within the survey unit is less than the DCGL, the ALARA criterion has been met.
Changes in Initial Survey Unit Assumptions:
The survey unit was designed as a Class 1 land survey and the sample results are consistent with that classification. The variability of the survey results was greater than the characterization data used for survey design. Forty-three areas of elevated activity were detected. Therefore the EMC criterion was met.
==
Conclusion:==
The FSS of this survey unit was properly designed as a Class I survey based on Table 5-4 of the LTP. The required number of direct measurements was made and the scan coverage met the requirement of Table 5-6 of the LTP. All of the direct measurements were less than Unity. No investigations were required.
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.
It is concluded that survey unit F8480012 meets the release criteria of 10CFR20.1402.
Page 8 of 8 FSS Summary Report F8480012 Maps April 1, 2008 Survey Unit F8480012
00 00 South Retention Basin Post Concrete. Removal Gamma Scan Survey 6812380E0 18878072N 9
IOD o
................... 87...
uen--\\1L I68 44-10 Gamma Scans for
/*
- III I ~~~~~100,,
coveragsiforgme=
of the basin floor and sides.
" "C'O"Basin floor gamma scans are performed 8 8C with a 44-10/SPA-3 and the western portion 7*
are 1m inwidth and rlm in length.
'71 5The eastern portion of the basin floor are 1m 74-in width and 12.5m in length with the exception of 75t wh
.....76
- -72*
- /
the southeast portion which ends at the basin
/
wall.
C8480012-Ml
CD (0
South Retention Basin Gamma Scan Survey i
6812380E 13 18878072F/
Final Effluent-'
110 10 37 4
4'5 Gamma Scans for 6
100% coverage of basin floor.
5 58i3 Gamma scans are measured 4 meters on center.
187967N F8480012-M2 00 00
CD 0
South Retention Basin Survey Gamma/Soil Sample Directs so Random start determined us
- 0 5 06 0.7 08 0
/
spreadsheet.
- ..x Start point is 1 of the basin a, 10.
south edge of Sample points 1 -
.... i A..
0.0 1 0 16 2
25 30 35 40 5
so 55 Final Effluent Basin point W-E 15, S-N 18 ing Random Trials 4.6 meters from west edge nd 13 meters from the the basin.
on 7.5 meter grid.
It00 00 C)
OO O~
F4840012-M3 Instrumentation April 1, 2008 Survey Unit F8480012
Table 2-1. Survey Unit Instrumentation Detector Detector Serial Instrument Model No.MDC No.
HPGe N/A 05047773 Soil-0.123pCi/gCs-137 HPGe N/A 05069128 Soil -0.137 pCi/g Cs-137 HPOCe N/A 05091834 Soil - 0.2137 pCi/g Cs-137 Soil - 0.212 pCi/g Cs-137 ISOCS N/A 2983947 Soil - 0.238 pCi/g Co-60 2350-1 44-10 171374 5.2 pCi/g Cs-137 2350-1 44-10 171992 5.2 pCi/g Cs-137 2350-1 44-10 171995 5.2 pCi/g Cs-137 2350-1 SPA-3 404397 5.2 pCi/g Cs-137 Table 2-2. Investigation Criteria and DCGL Instrument Parameter Value Soil - 26.3 pCi/g Cs-137 ISOCS Investigation Criteria - Scan Soil - 6.3 pCilg Co-60 All DCGLw 52.6 Cs-137 12.6 Co-60 All DCGLEMC Soil 69 pCi/g Cs-137 Investigation Criteria -
2x2 Na Scan 9300 cpm Page 2 of 2 Att. 2 Instrumentation F8480012 Investigation April 1, 2008 Survey Unit F8480012
Table 3-1 Survey Unit Investigation Grid Investigation Initial Value Investigation Elevated Area
- iCL, Investigation Unityic Level (pCi/g)
(pCi/g)
Result (pCi/g) Area (m2)
Factor Result (pCi/g)
Fraction 1
52.6 21 21 1
1 1 11.3 594.38 I
21 10.0312 1
25 1 2.04 2.04.
1
[~11.8 4f 14.6 L
.02 2
52.6 19.6 19.6 1
11.3 1
594.38 1
19.6 J_0.0289 2
12.5 1.95.51.95 I
1 F1,1.8 1 147.5.~
1.95 0.0123 4
52.6 6.34 6.34 1
11.3 594.38 J
6.34 0.0065 4
12.5 0.083 1
0.083 1
1 F-11.8j 147.5~
0.083 0.0000 8
52.6 9.5 9.5 1
11.3 594.38 J
9.5 0.0119 8
12.5 0.38 0.3
- 1.
F 11.8 1
147.5 0.3 0.0011 14 52.6 8.35 1
8.35 1
11.3 1
594.38
[
8.35 1 0.0099 14 12:5 0.19
.0.19 1
F11.8 147.5 j
0.19 0.0004 16 52.6 8.18 F
8.18 1
11.3-594.38 F 8.18 0.0096 16 12.5 0.32 F:0.32 1
F 11.8 147.5 F
.32 0012 17 52.6 5.95 t
5.95 1
11.3 594.38 F 5.95 0.0059 17 1'2.5:_=
- 0. 12 0.12 1
F 11.8
~147.5 F
0.12" 0.0000 18 52.6 4.29 4.29 1
11.3 594.38 4.29 0.0031 18"
- 12.
0.23 0.23 F:
1.8; 147.5*
F 0.237:
0.0006 19 52.6 8
8 1
11.3 594.38 F
8 F-0.0093 1912.5 0.ý36 F
0,.36:
1-F1.
147.5 F
Q.36$,01 20 52.6 3.38 3.38 1
11.3 1
594.38 F
3.38 0.0016 2,20 F
5206 F
0.0 1
F 11.8 147.5 0.06 00
.21 F
52.6 17.2 F
17.2 1
F11.3 594.38 F
17.2 0.0248 21 F
2.5 0.65, F
0.165 1
11:.8:
14.7.5 F
0.65 003 Page-2 of 8 -
Att. 3 Investigation F8480012
Investigation Initial Value Investigation Elevated Area Inves'tigation DCGLemc Grid Level (pCi/g)
(pCi/g)
Result (pCi/g) Area (m2)
Factor DCGLemc Result (pCi/g)
Unity 1
_I I
Fraction 22 1
52.6 3.35 3.35 1
11.3 594.38 3.35 0.0015 22~ 1 2.5-1 0.09-T 0.09 I
1 11.8 J 147.5~
.9 1000 23 52.6 9.8 9.8 1
1 11.3 1
594.38 9.8 0.0124 231.'
1-2.5 0.474-0.74 1
- 1.1.8 J 147.5;07 0.004-1 24 52.6 4.42 4.42 1
11.3 1
594.38 4.42 IfT0.0033
~24
- 1.
0.098 0.97-1:
F118 1
147.5 1
0.098:
I0.0000,-
25 52.6 7.04 7.04 1
11.3 594.38 7.04 0.0077 25 12.-5 0.42 10.;42 1
1 1,.8 I 147.5 0.42
]
.0.00190 26 52.6 7.83 7.83 1
11.3 594.38 7.83 0.0091 26 12.5ý 0~i19
-0.1.9 1
11.8I 14'7.5 01 If0.0004.
27 52.6 9.45 9.45 1
11.3 594.38 9.45 0.0118 271.
.101 11.8'
.f147.~~.01 0.0000 28 52.6 14.9 14.9 1
11.3 I 594.38 14.9
]
0.0209 28 2.51010.8 0.89,1.81 Ift 14.
.8
]002 29 52.6 I
3.81 3.81 1
11.3 I 594.38 3.81 0.0023
..29:1.
.6 01 118I 147.5 0.16 Iooi 30 52.6 11.2 11.2 1
11.3 I 594.38 11.2
]
0.0147 30 ~
12.5017 071L 1 I 1.8f 147.5 0-071.
003 31 52.6 7.05 7.05 1
11.3 594.38 7.05 0.0077 31
- 2.5 028_
.2 1
t
- 18. If 147.5 02.28-,
I 0.0010 32 1
52.6 6.64 6.64 1
11.3 If 594.38 6.64 1 0.0070 32 Z
52.5 7.1 7.5 0.15
- 1.
11.8 I 147.3 0.001J 33 52.6 If 7.01 1
7.01 1113If543 7.01 If
-r-0.0077 33 1
2.5 If 0:.28.~
0.28 1
118 If 147.5.
0.28 If 0oi Page 3 of 8 Att. 3 Investigation F8480012
Investigation Initial Value Investigation Elevated Area Investigation DUGLemc Grid Level (pCi/g)
(pCiig)
Result (pCiig) Area (m2)
Factor DCGLemc Result (p Cig)
Fractionit 34 52.6 1.41 1.41 1
11.3 594.38 1.41 0.0000 34 12.5
[
0.19 1.
11
.8...
1..i 147 5.5
-:0.1 9' I
0.0004.
35 52.6 6.07 6.07 1
11.3 594.38 6.07 1 0.0061 35 J
2.5' 4
040.11
- 1 170.4 1.41 T-0.001:8 36 52.6 4.81 4.81 1
11.3 594.38 4.81 0.0040 36 1 1.5
- 0.
.>1
-1K-147.5 0.1 1
0.00 38 52.6 3.69 3.69 1
11.3 594.38 3.69 0.0021 38 1 125 0.16 0.16, 11.8 147.5 0.:16 Qi0.00011 39 52.6 2.17 2.17 1
11.3 594.38 2.17 0.0000
.. 3 12.5 0'.2....02 0.2 1
-11.
1,
- 14.
Q.
41 52.6 4.31 4.31 1
11.3 594.38 4.31 0.0031 41
-12.5' 0.43::.:
4.43
[
1.8.
147.5.
-0.43-
-0.0020 43 52.6 8.79 8.79 1
1.1.3 594.38 8.79 0.0107 4312.5
- 0.
1817.56 0.001 45 52.6 3.93 3.93 1
11.3 594.38 3.93 0.0025
- 45.
]
12.5
.018 Q.18 111.8 1475.0.18, 0.0003.
49 52.6 6.23 6.23 1
11.3 594.38 6.23 0.0064 49 6
?5083 1
0.8 1
I 1.8.
147.5
.J 083ý 0047:
64 52.6 2.44 2.44
[
1 11.3 594.38 2.44 0.0000 64 f 2.016 00.6.-[-1.
- 1.
- 4.
0.16:
0."00,01 68 52.6 2.16 2.16 1
11.3 594.38 2.16 0.0000 68 12.5 10 1
1 11.8 4.5
]
15 0.0021, 69 j
52_.6 j
15
- 1 5
r 1
11.3 1594.38 ]
15 0.0211 69 2
{
1.04 j
-104 1:1.8 ]
147.5
.1_
_4
- 0.
Page 4 of 8 Att. 3 Investigation F8480012
Investigation Initial Value Investigation Elevated Area Investigation DCGLemrc DCG~nic esul (p~/g)
Unity Grid Level (pCi/g)
(pCiig)
Result (pCi/g) Area (mi)
Factor FranResult (pCi/g)
Uity 70 52.6 11.5 11.5 1
11.3 594.38 11.5 0.0152 70 12.5:
13 1.3 1
11.:8 147.5 1.13 0ý00*67..,
71 52.6 10.3 10.3 1
11.3 594.38 10.3 0.0132 71 12.51
-041 1
04....
111.8.
.17.S 0.41:
0.0018..
72 52.6 28.3 28.3 1
11.3 594.38 28.3 0.0435 7212.5 2.58 2.58
- 1.
118 14-7.5-2.58 0.0166 73 52.6 6.09 6.09 1
11.3 594.38 6.09 0.0061 73 12,5 1.1 1.1 1
1.:8 147.5 1.1.
0.0065 74 52.6 2.67 2.67 1
11.3 594.38 2.67 0.0004 74' 1.2 0.13
.0.3 1,
- 11.8.
147.5 0.13 0-00e0 75 52.6 1.9 1.9 1
11.3 594.38 1.9 0.0000 75 12.5 0.089 0.089:
1
.11.8 5147.5 0.089 0.0000 76 52.6 0.089 0.089 1
11.3 594.38 0.089 0.0000
- 76.
2.5 0.05 0.058 1
11.8 547.5 0.058 0.0000 77 52.6 0.18 0.18 1
11.3 594.38 0.18 0.0000
-77 1 ?5.
- 0;057 0.057 1
j;11.8 147.5:
0.057 000 78 52.6 0.06 0.06 1
11.3 594.38 0.06 0.0000 78
- 12.
- .60.06 1
- 11.
147.5....
0.06.&
0.Q0000 79 52.6
- 0.12
.012 1
11.3 594.38 0.12 0.0000 79 12.5_0 0.0 4
0.4 11.~
.1475.5 0.04 D.0000O 80 52.6 4.01.
4.01 1
11.3 594.38 4.01 0.0026 80 12.'5 0.66 0.66 111.8.
147.5 0.66
.0.0035,.,
81 52.6
.0.74 0.74 1
11.3 594.38 0.74 0.0000 8-1
.1.5 0.8
~
.8111..8 1.47.5..0 0.0.00.0 82 52.6 17.3 17.3 1
11.3 594.38 17.3 0.0250 82 12.5 1.28.
1.28 1
11,8 147.5 1.28 0.0077 Page 5 of 8 Att. 3 Investigation F8480012
Investigation Initial Value Investigation Elevated Area DCGLm Investigation DCGLemc Grid Level (pCi/g)
(pCi/g)
Result (pCi/g) Area (m2)
Factor Result (pCiig)
Fraction 83 52.6 31.4 31.4 1
11.3 594.38 31.4 0.0487 83 12.5 3.93 3.93 11'.8 147.5'
.... 93 0.0257 84 52.6 8.02 8.02 1
11.3 594.38 8.02 0.0094 84' 12.5<
0.453
~
0.53 11 11-.81
.147T5 0.53....0.0027.
85 52.6 7.52 7.52 1
11.3 594.38 7.52 0.0085
-85 12.5 0.28 0.28 1
11.8 1750.28 0.0010 86 52.6 17.5 17.5 1
11.3 594.38 17.5 0.0253 8612.5 0.20.32 1
11.8 147.5 0.32 0.0012m 87 52.6 24.9 0.584 1
11.3 594.38 0.584 0.0000 87 12.5
- 0. 2 8, 0.0827 1,
.11.8 147.5 0.0827 0.0000 88 52.6 21.2 21.2 1
11.3 594.38 21.2 0.0315 88 12.5 0.2 0.2
- 11.
5 147.5 0.2 0.0004 90 52.6 0.3 0.3 1
11.3 594.38 0.3 0.0000 90 12.560.06 0.06.
1 11.8 147.5 01.4 0.0000 93 52.6 36.3 3.3 1
11.3 594.38 36.3 0.0570 93 12.5 0.8 08 1:
.1.
147.5
ý.
8 0.0045 94 52.6 1.44 1.44 1
11.3 594.38 1.44 0.0000
.94 12.5.
0.07
-0.07 1
11.8 147.5
- 0. 07
-0.0000 95 52.6 3.73 3.73 1
11.3 594.38 3.73 0.0022
.95 12.5-0.1 0.1 1
11.8 147:5 0.1 0.0000, 96 52.6 21.4 21.4 1
11.3 594.38 21.4 0.0319 961:2.5 0.2
- 0.
1.1.8 147.5 02000 97 52.6 6.87 6.87 1
11.3 594.38 6.87 0.0074
- 9 12.5 0.15 0.15 11 11.8 5147.5 0.1,5 0.0001 98 52.6 79.8 0.62 1
11.3 594.38 0.62.
0.0000 9812.5:
1.64 0.08 1
11.8 147'.5 0G.08 0.0000 Page 6 of 8 Att. 3 Investigation F8480012
Investigation Initial Value Investigation Elevated Area UnyInvestigation DCGLemc Grid Level (pCi/g)
(pCi/g)
Result (pCi/g) Area (m2)
Factor DCGLemc Result (pCi/g) atcti Resut (pi/g)
Fraction 99 52.6 0.32 0.32 1
11.3 594.38 0.32 0.0000
'99-
.12.5 060.06 1
11.8:.
147.5
-0.06 000.
100 52.6 5.87 5.87 1
11.3 594.38 5.87 0.0058 10 12.5
.16
- 0. 16.
1 11.8 1:47.5 0.0.00 101 52.6 14.8 14.8 1
11.3 594.38 14.8 0.0208 101 12.5 0.2 0.2 1
11.8 14.5 0.2 0.0004 102 52.6 10.7 10.7 1
11.3 594.38 10.7 0.0139 102 12.5 0.31 0.31 1
11.J 147.5 0.31 0.0012 103 52.6 6.1 6.1 1
11.3 594.38 6.1 0.0103 103 12.5 0.3
.36 1
11.8 147.5 0.36
'0.0014 104 52.6 1.17 1.17 1
11.3 594.38 1.17 0.0000 10412.5 12i.
0.12 V
181750.120.OO 105 52.6 0.07 0.07 1
11.3 594.38 0.07 0.0000 105 12.5 0.1.0.355 1
11.83 147.53 0.0 0.0000 106 52.6 0.037 0.037 1
11.3 594.38 0.037 0.0000 1:06 125:
0.,033
-0.033, 11 11:8*
147.5 0.330.00 107 52.6 3.3 3.3 1
11.3 594.38 3.3
.0.0014
- 107, 12.5 0.08F 0.08 1
11.8~
14 7.50.8
.00 108 52.6 1.21 1.21 1
11.3 594.38 1.21 0.0000 108125
.1
~.01 11:
147.5 0.ý1 0.0000 109 52.6 0.05 0.05 1
11.3 594.38 0.05 0.0000 109 12.5
-0.03.......03-1
-18 147.5 0.03 00 110 52.6 13.9 13.9 1
11.3 594.38 13.9 0.0193 110
.125 0.8 0.8.
1
- 118
- 4.
08
.0'45:
111 52.6 0.58 0.58 1
11.3 594.38 0.58 0.0000 111 12.5 00 0Q81 118147.5 08 0.0000 Page 7 of 8 Att. 3 Investigation F8480012
Investigation Initial Value Investigation Elevated Area Investigation D GLenc Grid Level (pCiig)
((pCi/g)
Result (pCi/g)
Area (m 2)
Factor DCGLerc IResult (pCig) action Resut (pi/g)
Fraction 112 52.6 0.08 0.08 1
11.3 594.38 0.08 0.0000 112 12.5 0.07
,0.07
.12.5 11.8.
147.5 0.07 00000
.113 52.6 0.08 0.08 1
11.3 594.38 0.08 0.0000 113 12.5 0107
- 0.07 1
118 147.5
.0.07 0.0000
.114 52.6 0.15 0.15 1
11.3 594.38 0.15 0.0000 114 2.5 0.8 008 1
11.8 1750.08 0ý.000 DCGL =
SU Mean =
Survey Unit Remainder 52.6 2.45 0.046 12.6 0.138 EMC Unity Sum 0.9840 Grid 98 was above the DCGLw requiring remediation. Grids 87 and 98 were sampled at 6"to 12" and 12" to 18" to ensure migration of activity had not occurred.
The first result for each grid is the Cs-1 37 results, the second result (shaded) is Co-60.
Page 8 of 8 Att. 3 Investigation F8480012 Data Assessment April 1, 2008 Survey Unit F8480012.
9) 4ý1 0
9) tr-00 F8480012 Quantile Plot 0.450 0.400 0.350 0.300 0.250 0.200 0
I--
N "7
0.150 0.100 0.050 0.000 0.02 0
20 40 60 80 100 Percentile Unitized Total Value
-Median 75th Percentile -
- 50th Percentile
(D0 0
CD
~rn 00
.P.
00 F8480012 Scatter Plot 0
(-
N C) 0.500 0.400 0.300 0.200 0.100 0.000
-0.100
-0.200
_n innlf 0
0 0
0 0 0 0
0 0
0 0
0 0
0 m
m I
I(I 0.357 0.058
-0.242
-a Measurement Locations 0
Unitized Total Value -
-Average
-"+3StDev".
"-3StDev"
0 4Cl CD 00 00 tl)
F8480012 Frequency Plot 0
C:
a) 0CU a)
C,)
-Q0 18 17 16 15 14 13 12 11 10 9
8 7
6 5
4 3
2 1
0 0*
czy A*
0*
Bins - Upper End Value (Unitized Total)