ML102030236

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State of Wisconsin Prairie Island Environmental Radioactivity Survey
ML102030236
Person / Time
Site: Prairie Island  Xcel Energy icon.png
Issue date: 12/31/2008
From:
State of WI, Dept of Health Services
To:
Office of Information Services
References
FOIA/PA-2010-0009
Download: ML102030236 (19)
v • d • e


Text

State of Wisconsin 2008 Prairie Island Environmental Radioactivity Survey Wisconsin Department of Health Services Division of Public Health Bureau of Environmental and Occupational Health Radiation Protection Section P.O. Box 2659 Madison, Wisconsin 53701 A

Table of Contents Page Introduction I WI DHS Prairie Island Environmental Monitoring I Sampling Program Program Modifications 1 Laboratory Services and Quality Assurance I Detection Limits I Reporting of Sample Analysis Results 2 Results & Discussion 5 References 7 Sample Activity Summary 8 ii

List of Tables Page Table 1. WI DHS Prairie Island environmental monitoring sampling sites. 4 Table 2. Sample collection summary and required analyses. 4 Table 3. Missing Sample Report. 5 Table 4. Sample activity summary for the WI DHS Prairie Island environmental 8 monitoring program.

Table 6. WI DHS air particulate gross beta and air iodine (1-131) results from the 11 the Prairie Island environmental monitoring program.

Table 6. WI DHS gamma isotopic results from the quarterly composite of air 13 particulate filters for the Prairie Island environmental monitoring program.

Table 7. WI DHS TLD network for the Prairie Island environmental monitoring 14 program.

Table 8. WI DHS results for precipitation samples collected for the Prairie Island 14 environmental monitoring program.

Table 9. WI DHS results for surface water samples collected for the Prairie Island 15 environmental monitoring program.

Table 10. WI DHS results for fish samples collected for the Prairie Island 16 environmental monitoring program.

Table 11. WI DHS results for well water samples collected for the Prairie Island 16 environmental monitoring program.

Table 12. Wi DHS results for milk samples collected for the Prairie Island 17 environmental monitoring program.

Table 13. WI DHS results for vegetation samples collected for the Prairie Island 19 environmental monitoring program.

Table 14. WI DHS results for soil samples collected for the Prairie Island 20 environmental monitoring program.

List of Figures Figure 1. Location of WI DHS environmental monitoring sites for the Prairie Island 3 Monitoring program.

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State Of Wisconsin DHS 2008 Prairie Island Environmental Radioactivity Survey Introduction Wisconsin Public Health Statues 254.41 mandates the Department of Health Services to conduct environmental radiation monitoring around the nuclear power facilities that impact Wisconsin. This environmental monitoring report is for the Prairie Island nuclear generating plant for the calendar year January - December 2008 and provides a description and results of this environmental monitoring program.

WI DHS Prairie Island Environmental Monitoring Sampling Program The WI DHS environmental monitoring program consists of the collection of various types of samples from the air, water and terrestrial exposure pathways. The sampling program included samples of air, precipitation, ambient gamma radiation (TLD), surface water, fish, soil, milk, well water and vegetation that are collected from selected locations at planned sampling intervals.

Table 1 is. a listing of sampling sites and includes a description, direction and distance from the monitored power plant. Table 2 provides a listing of types of samples collected, sites where samples are collected, the number of samples collected, number of samples that were missed and a listing of the required analyses. Table 3 provides an explanation of missing samples or non-routine sample analyses. Figure 1 is a map showing the location of each environmental sampling site.

Program Modifications There were no program modifications for 2008.

Laboratory Services and Quality Assurance The analysis of the samples is performed under contract with the State Laboratory of Hygiene (SLH).

SLH maintains a quality assurance program. Analytical procedures provide for routine replicate analyses to verify methods and instrument operation. Traceable sources are used to regularly calibrate the counters and daily performance checks are made between calibrations. In addition, quality control charts are maintained on the counters.

SLH participates in the Environmental Resource Associates' Proficiency Testing program and has performed satisfactorily over the report period. Proficiency testing results are available from the State Laboratory of Hygiene.

Detection Limits Detection limits, required by WI DHS, will be expressed as a lower limit of detection (LLD).* The required WI DHS LLD as indicated in Table 4 under the heading "LLD" is an "a priori" estimate of the capability for detecting an activity concentration by a given measurement system, procedure, and type of sample. Counting statistics of the appropriate instrument background are used to compute the LLD for each specific analysis. Using 4.66 times the standard deviation (Sb) of the instrument background, the LLD for each specific analysis is defined at the 95% Confidence Level.

The LLD for each radioisotope listed in Table 4 has been calculated from the following equation:

4.66 Sb LLD = -

E

  • V *2.22
  • Y
  • S
  • exp(-dt)

Where:

LLD is the "a priori" lower limit of detection as defined above, as picocuries per unit mass or volume, Sb is the standard deviation of the background counting rate or of the counting rate of blank sample as appropriate, as counts per minute, E is the counting efficiency, as counts per disintegration, V is the sample size in units of mass or volume, 2.22 is the number of disintegrations per minute per picocurie, Y is the fractional radiochemical yield, when applicable, S is the self-absorption correction factor, d is the radioactive decay constant for the particular radionuclide, and t for environmental samples is the elapsed time between sample collection, or end of the sample collection period, and time of counting.

Typical values for E, V, Y and dt have been used to calculate the LLD.

Reporting of Sample Analysis Results Results for specific analyses will be reported as either a "less than" (<) value or an actual activity value.

The reporting of results in Table 4 under the heading "Range" and in Tables 5-14 are "a posteriori" calculations based on the actual analysis performed using the actual sample values for E, V, Y and dt.

Typically the reported "less than" (<) results are lower than the required WI DHS LLD indicating that the required WI DHS LLD has been met.

An actual activity value will be accompanied by an uncertainty term for that analysis. The uncertainty term is a plus or minus counting uncertainty term at the 2 sigma (95%) confidence interval and is printed as (+- or +). Examples and explanations of data reporting are:

Example Nuclide Activity reported 1 137Cs < 10 pCi/liter 2 137Cs 15 + 3 pCi/liter In example I we can be 95% confident that the sample. activity, ifany, is less than the LLD of 10 pCi/liter. In example 2 we can be 95% confident that the actual sample activity is greater than the LLD for that analysis and is between 12 and 18 pCi/liter.

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Figure 1. Location of WI DHS environmental monitoring sites for the Prairie island monitoring program 3

Table 1. WI DHS Prairie Island environmental monitoring sampling sites.

Distance and direction Sample site (miles) Location description PRI-la 11.6 NW Prescott; air site PRI- b 11.6 NW Prescott; harbor area PRI-2 3.6 ESE Trenton PRI-3 10.9 NE Ellsworth (discontinued 07101196)

PRI-4a 8.7 ESE Bay City park PRI-4b 8.7 ESE Bay City, Hwy 35 PRI-5 4.8 ESE Hager City PRI-6a 1.9 NNE Diamond Bluff; Pierce County highway shed PRI-6b 1.8 NNE Diamond Bluff cemetery PRI-7 11.9 E Junction of Hwy 35 & Cty D (discontinued 07/01/96)

PRI-8 3.4 N Station 2 - farm PRI-9 6.6 ESE Bay City substation on Hwy 35 PRI-10 2.6 NE Welch farm PRI-11 4.0 NNE D. Dosdall farm (discontinued in March, 1995)

PRI-12 11.1 NNW S. Rohl farm (discontinued in October, 1999)

PRI-13 3.8 E Christiansen farm PRI-14 13.8 N A. Huppert farm (discontinued in February 2004)

PRI-15 13.9 N R. Peterson farm PRI-T30 1.9 N Diamond Bluff PRI-T31 1.7 NNE Diamond Bluff PRI-T32 1.8 ENE 290th Avenue PRI-T33 4.4 N Hwy 35, Thomas Killian residence PRI-T34 4.7 NE Cty K and 840th Street PRI-T35 5.2 E Cty W and 790th Street PRI-T36 4.8 ESE Hager City PRI-T37 10.3 NE Ellsworth PRI-T38 8.9 ESE Bay City, Hwy 35 PRI-T39 11.6 NW Prescott Table 2. Sample collection summary and required analyses for 2008.

Collection Number of Number of Sample Type and Samples Sample Required Frequency Site locations Collected Deviations Analyses air particulate C/BW la, 6a, 9 78 0 GA, GB, GI air iodine C/BW la, 6a, 9 78 0 GI precipitation C/BW la, 9 12 0 GB, H TLD C/Q T30 - T39 40 0 direct exposure surface water G/SA lb, 2,4a 6 0 GA, GB, GI, Sr, H fish G/SA upstream, downstream 4 0 GI vegetation G/SA Ib, 4b, 5, 6a, 8, 9 12 0 GA, GB, GI soil GISA lb, 4b, 5, 6a, 8, 9 12 0 GA, GB, GI well water GISA 4a, 5, 6b 6 0 GA. GB, H milk G/M 10, 13,15 24 0 GI, I, Sr Collection type: C/ = continuous; G/ = grab Frequency: 1W = weekly; /M = monthly; IQ = quarterly; /A = annually; /BW = bi-weekly; /SA = semi-annually Required analyses: GA = gross alpha; GB = gross beta; GI = gamma isotopic; Sr = strontium; I = iodine; H = tritium 4

Table 3. WI DHS missing sample report or non-routine analyses for 2008.

Sample type Date Site Explanation There were no missed samples or non-routine analyses for 2008.

Results And Discussion Air Particulate Asummary of reported activities by WI DHS for air particulate samples is included in Table 4. Results from the individual sample analyses are listed in Tables 5-6.

From the individual activities or quarterly averages for gross beta activities it may be noted that there are no significant differences between sites at different distances from the Prairie Island facility. With no significant difference with distance from the Prairie Island site, an increase in gross beta activity attributable to the Prairie Island plant operation is not evident.

The gamma isotopic analysis of the quarterly air particulate filter composites detected only small amounts of the radioisotopes listed in Table 4. Beryllium-7 (TBe), detected in all composites, is a naturally occurring radioisotope that is constantly produced through nuclear reactions between cosmic rays and nuclei in the atmosphere and is detected in air composites from other areas of the state.

Influence by the Prairie Island nuclear generating facility on air quality is not evident from air particulate analysis.

Air Iodine A summary of reported activities by WI DHS for air iodine samples is included in Table 4. Results from the individual sample analyses are listed in Table 5.

Air iodine measurements were all below the LLD of 0.07 pCi/mi3 for all sites.

Direct Radiation - Thermoluminescent Dosimeters (TLD's)

A summary of reported activities by WI DHS for direct radiation is included in Table 4. Results from the individual sample analyses are listed in Table 7.

Direct radiation (TLD) data for 2008 from the WI DHS network was comparable for all sites. Significant differences in exposure were not noticed at different distances from the Prairie Island nuclear facility.

The average quarterly exposure from the ten sites located within Wisconsin was 15.2 + 2.1 milliroentgens. The average quarterly exposure for 2008 is at background levels and is comparable to other areas within Wisconsin.

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Precipitation A summary of reported activities by WI DHS for precipitation is included in Table 4. Results from the individual sample analyses are listed in Table 8.

The gross beta activity in precipitation was within the normal range of activity when compared to previous year's data.

Surface Water A summary of reported activities by WI DHS for surface water samples is included in Table 4. Results from the individual sample analyses are listed in Table 9.

The surface water samples showed no unusual activities and are at background levels comparable to previous years. From the gamma isotopic analysis all radioisotopes were below their respective LLD.

All reported activities for gross beta, gross alpha and tritium (3H), except for one tritium (3H) activity at site PRI-2, are at background levels. The reported activity at PRI-2 is a site closest to the plant and could possibly be attributed to a Prairie Island waste release. The surface water samples uniformly show activities well below state or federal standards.

Fish A summary of reported activities by WI DHS for fish samples is included in Table 4. Results from the individual sample analyses are listed in Table 10.

The fish samples showed no unusual activities. Naturally occurring potassiurm-40 (40 K) was detected in all samples. All other radioisotopes were below their respective LLD.

Well Water A summary of reported activities by WI DHS for well water samples is included in Table 4. Results from the individual sample analyses are listed in Table 11.

The well water samples showed no unusual gross alpha and gross beta activities and all activities for tritium ( 3H) were less than its LLD. The activity levels are all below state and federal standards.

Milk A summary of reported activities by WI DHS for milk samples is included in Table 4. Results from the individual sample analyses are listed in Table 12.

Analysis of the milk samples showed no unusual activities. Naturally occurring potassium-40 (40K) was detected in all samples. The detected activities for strontium-90 (90Sr) are attributable to residual fallout from previous atmospheric nuclear weapons testing and were also detected in previous years at similar activity levels.

Vegetation A summary of reported activities by WI DHS for vegetation samples is included in Table 4. Results from the individual sample analyses are listed in Tables 13.

Analysis of the vegetation samples showed no unusual activities. The gamma isotopic analysis detected only small amounts of the naturally occurring radioisotopes beryllium-7 (7Be) and potassium-40 (40K) listed in Table 4. All other radioisotopes were below their respective LLD.

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Soil A summary of reported activities by WI DHS for soil samples is included in Table 4. Results from the individual sample analyses are listed in Table 14.

Analysis of the soil samples showed no unusual activities. The gamma isotopic analysis detected only small amounts of the radionuclides listed in Table 4. Potassium-40 ( 40K) is a naturally occurring radioisotope. The reported activities for cesium-i 37 (137Cs) were also detected in previous years and are largely attributable to fallout from previous atmospheric nuclear weapons testing. Naturally occurring radioisotopes such as radium-226 (226Ra), bismuth-214 (2 14Bi), lead-214 (14 Pb), actinium-228 (228Ac), bismuth-212 ( 212Bi) and lead-212 ( 212 Pb) from the naturally occurring uranium-238 (238U) and thorium-232 (232Th) decay series are commonly detected but have not been quantified or reported.

Dose to an Average Individual Federal regulations 10 CFR 20, 10 CFR 50 Appendix I and 40 CFR 190 restrict the annual exposure of the population from all parts of the nuclear fuel cycle, including nuclear power plants. Doses resulting from gaseous and liquid effluent releases from the Prairie Island nuclear generating facilities are less than the limits as stated in these Federal regulations.

The WI DHS limits for permissible levels of radiation exposure from external sources in unrestricted areas is defined in the Wis. Adm. Code section HFS 157.23. Doses resulting from gaseous and liquid effluent releases from the Prairie Island nuclear generating facilities are less than the limits as stated in Wis. Adm. Code section HFS 157.23.

References State of Wisconsin, Wisconsin Administrative Code, HFS 157.23 U.S. Environmental Protection Agency, Environmental Radiation Requirements for Normal Operations of Activities in the Uranium Fuel Cycle, EPA 520/4-76-016, 40 CFR Part 190, November 1976.

U.S. Nuclear Regulatory Commission, Title 10, Part 20.

U.S. Nuclear Regulatory Commission, Title 10, Part 50, Appendix I.

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Table 4. Sample activity summary for the Prairie Island environmental monitoring program for 2008.

Sample type (units) LLD Number of samples a Analysis Range air particulate 0.005 78 / 78 gross beta 0.009 - 0.039 (pCi/m 3) gamma isotopic 0.020 12/12 Be-7 0.042 - 0.081 0.002 12/0 Mn-54 < 0.0005 0.002 12/0 Co-58 < 0.0005 0.005 12/0 Fe-59 < 0.0013 0.002 12/0 Co-60 < 0.0005 0.005 12/0 Zn-65 < 0.0013 0.002 12/0 Nb-95 < 0.0007 0.005 12/0 Zr-95 < 0.0011 0.002 12/0 Ru-103 < 0.0005 0.015 12/0 Ru-106 < 0.0038 0.020 12/0 1-131 < 0.0022 0.002 12/0 Cs-1 34 < 0.0004 0.002 12/0 Cs-1 37 < 0.0005 0.030 12/0 Ba-140 < 0.0035 0.020 12/0 La-140 < 0.0020 0.002 12/0 Ce-141 < 0.0007 0.005 12/0 Ce-144 < 0.0024 air iodine 0.07 78/0 1-131 < 0.030 (pCi/m 3) 3.0 6/5 gross beta (sol) < 2.6 - 4.7 3.0 6/1 gross beta (insol) < 2.4 - 1.6 3.0 6/3 gross alpha (sol) < 2.1 - 4.0 3.0 6/0 gross alpha (insol) < 1.3 300 6/2 H-3 < 180 - 1790 2.0 6/0 Sr-89 < 0.8 1.0 6/0 Sr-90 < 0.4 gamma isotopic 15 6/0 Mn-54 <8 15 6/0 Co-58 <9 30 6/0 Fe-59 < 19 15 6/0 Co-60 <11 30 6/0 Zn-65 < 22 15 6/0 Nb-95 <9 30 6/0 Zr-95 <14 15 6/0 1-131 <10 15 6/0 Cs-134 <9 15 6/0 Cs-137 <8 60 6/0 Ba-140 < 29 15 6/0 La-140 <14 8

Table 4. Sample activity summary for the Prairie Island environmental monitoring program for 2008.

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Table 7. WI DHS TLD network for the Prairie Island environmental monitoring program.

Date Placed: 01/09/08 04/09108 07/09/08 10/08/08 Date Removed: 04/09/08 07/09/08 10/08/08 01/14/09 Days in the Field: 91 91 91 98 Individual quarterly date is reported as : mR / Standard Quarter + 2 sigma counting error.

TILD sites that are located 0 - 2 miles from the Prairie island facility.

T30 13.5 +- 0.7 13.9 +- 0.7 13.5 +- 0.7 16.5 +- 0.5 T31 13.1 +- 0.9 13.9 +- 0.9 12.9 +- 0.7 16.0 +- 0.7 T32 13.7 +- 0.9 14.0 +- 1.0 14.4 +- 0.6 16.5 +- 1.1 Quarterly average +- s.d. 13.4 +- 0.3 13.9 +- 0.1 13.6 +- 0.8 16.3 +- 0.3 TILD sites that are located 2- 5 miles from the Prairie island facility T33 16.7 +- 0.6 17.3 +- 0.7 16.4 +- 0.6 19.8 +- 0.5 T34 17.0 +- 0.7 17.7 +- 0.6 17.4 +- 0.5 20.4 +- 0.5 T35 15.2 +- 0.6 15.7 +- 1.0 16.2 +- 0.6 18.2 +- 1.1 T36 13.0 +- 0.6 16.5 +- 0.9 13.8 +- 0.4 19.2 +- 0.7 Quarterly average +- s.d. 15.5 +- 1.8 16.8 +- 0.9 16.0 +- 1.5 19.4 +- 0.9 TLD sites that are located greater than 5 miles from the Prairie island facility T37 13.7 +- 1.0 14.3 +- 0.7 14.2 +- 1.3 17.1 +- 0.6 T38 13.3 +- 0.5 12.3 +- 0.8 13.0 +- 0.4 14.8 +- 0.8 T39 12.9 +- 0.8 12.4 +- 0.8 12.9 +- 0.9 14.9 +- 0.9 Quarterly average +- s.d. 13.3 +- 0.4 13.0 +- 1.1 13.4 +- 0.7 15.6 +- 1.3 Table 8. WI DHS analysis results for precipitation samples collected for the Prairie Island environmental monitoring program.

Measurements in units of nCi/m2 monthly composite sample Collection inches gross beta tritium 01/23/08 0.55 0.13 +- 0.03

  • 2.5 02/22/08 0.27 0.05 +- 0.01
  • 1.2 03/19/08 0.64 0.23 +- 0.03
  • 2.9 04/16/08 2.57 < 0.16
  • 12 05/18/08 4.23 0.19 +- 0.10
  • 19 06/29/08 5.15 0.24 +- 0.14
  • 24 07/26/08 2.73 < 0.10
  • 12 08/22/08 1.59 < 0.10 *<7.7 09/17/08 2.55 < 0.16
  • 12 10/17/08 1.79 0.12 ÷-0.07
  • 8.6 11/17/08 1.65 0.13 +- 0.07
  • 8.0 12/27/08 1.02 0.13 +- 0.05
  • 4.9 14

Table 9. WI DHS analysis results for surface water samples collected for the Prairie Island environmental monitoring program.

Measurements in units of pCi/liter Site: PRI-1 PRI-2 PRI-4 PRI-1 PRI-2 PRI-4 Collection date: 06/03/08 06103/08 06/03/08 09/16/08 09/16/08 09/16/08 gross alpha-sol < 2.1 4.0 +- 2.0 4.0 +- 2.0 < 1.9 2.0 4.0 +- 2.0 gross beta-sol 1.7 +- 1.1 3.5 +- 0.8 2.9 +- 0.9 < 2.6 4.2 +- 1.3 4.7 +- 1.4 gross alpha-insol < 1.1 < 1.1 < 1.3 < 1.1 1.1 1.1 gross beta-insol < 1.2 < 1.1 1.6 +- 0.8 < 2.4 2.4 2.4 H-3 * < 180 < 180 < 180 < 180 1790 +- 140 350 +- 120 Sr-89 * < 0.7 < 0.8 < 0.6 < 0.4 0.4 0.4 Sr-90 * < 0.1 < 0.4 < 0.4 < 0.4 0.3 0.3 gamma isotopic Mn-54 6 8 6 <6 < 7 < 8 Co-58 6 8 6 <6 < 6 < 9 Fe-59 11 19 13 < 14 < 12 < 15 Co-60 7 8 7 < 8 < 7 < 11 Zn-65 15 22 17 < 17 < 17 < 21 Nb-95 6 8 6 < 6 < 7 < 9 Zr-95 11 12 11 < 11 < 10 < 14 1-131 8 8 6 <8 < 8

  • 10 Cs-1 34 7 8 6 <7 < 7 <9 Cs-137 6 7 6 <7 < 6 <8 Ba-140 27 29 18 < 23 < 25
  • 27 La-140 9 14 11 < 11 < 11
  • 14 Radioisotopes other than those reported were not detected.

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Table 10. WI DHS analysis results for fish samples collected for the Prairie Island environmental monitoring program.

Measurements in units of pCi/kilogram (wet)

Collection 05/12/08 05/15/08 09/15/08 09/17/08 Location downstream upstream downstream upstream Type white bass white bass white bass white bass gamma isotopic K-40 2610 +- 120 2190.+- 130 3000 +- 200 3100 +- 200 Mn-54 17 20 18 17 Co-58 22 27 35 27 Fe-59 70 80 80 120 Co-60 8 21 29 31 Zn-65 44 60 80 110 Nb-95 44, 46 45 26 Zr-95 39 47 60 33 Cs-134 15 18 27 22 Cs- 137 13 14 28 19 Radioisotopes other than those reported were not detected.

Table 11. WI DHS analysis results for well water samples collected for the Prairie Island environmental monitoring program.

Measurements in units of pCi/liter PRI-4 PRI-5 PRI-6 PRI-4 PRI-5 PRI-6 Collection date: 06/03/08 06/03/08 06/03/08 09/16/08 09/16/08 09/16/08 gross alpha < 2.4 < 2.5 < 2.7 < 1.9 < 1.9 < 2.0 gross beta 1.6 +- 0.9 1.7 +- 0.8 < 1.6 < 1.4 < 1.1 < 1.1 H-3 < 180 < 180 < 180 < 180 < 180 < 180 16

Table 12. WI DHS analysis results for milk samples collected for the Prairie Island environmental monitoring program.

Measurements in units of pCi/liter Location PRI-13 PRI-10 PRI-13 PRI-10 PRI-13 PRI-10 Collection date: 01110108 02106108 03126108 04/10/08 05113108 06/12/08 1-131 < 0. 3 < 0.4 < 0.2 < 0.4 Sr-90 1.1 +- 0.2 1.1 +- 0.3 0.9 +- 0.3 0.4 +- 0.2 0.9 +- 0.3 < 0.4 gamma isotopic K-40 1320 +- 9( 1500 +- 80 1370 +- 80 1330 +- 60 1420 +- 60 1440 +- 60 Mn-54 < 14 10 11 7 7 6 Co-58 < 1I2 10 10 8 6 6 4

Fe-59 < 2' 20 25 17 14 14 Co-60 < 1;2 14 11 7 8 7 Zn-65 < 219 32 31 21 18 16 Nb-95 < 10 10 11 8 6 7 Zr-95 < 2!5 19 18 12 11 11 1-131 < 1 10 13 9 7 10 Cs-134 < I 10 12 7 7 6 Cs-137 < 1 12 10 8 8 5 Ba-140 < 37 34 42 31 23 30 La-140 < I2 14 14 15 9 15 Location PRI-1 3 PRI-10 PRI-13 PRI-o10 PRI-1 3 PRI-10 Collection date: 07/21/08 08/12/08 09/09/08 10/14/08 11/11/08 12/16/08 1-131 < 0.2 < 0.6 < 0.2

  • 0.2 Sr-90 1.2 +- 0.3 0.8 +- 0.3 0.8 +- 0.2 0.5 +- 0.2 1.0 +- 0.3
  • 0.4 gamma isotopic K-40 1450 +- 60 1690 +- 100 1490 +- 60 1500 +- 70 1430 +- 60 1560 4- 150 Mn-54 6 14 7 7 7 14 Co-58 6 13 5 6 7 10 Fe-59 14 23 12 15 14 27 Co-60 7 12 7 8 9 15 Zn-65 17 34 16" 18 15 30 Nb-95 7 10 5 6 6 13 Zr-95 10 21 9 11 10 19 1-131 8 13 6 6 6 11 Cs-1 34 7 12 5 6 6 8 Cs-137 6 13 5 7 6 11 Ba-140 27 44 20 21 20 42 La-140 8 12 9 9 11 14 Radioisotopes other than those reported were not detected.

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Table 12. WI DHS analysis results for milk samples collected for the Prairie Island environmental monitoring program.

Measurements in units of pCi/liter Location: PRI-15 Collection date: 01/10/08 02/06/08 03/26/08 04/10/08 05/13/08 06/12/08 1-131 < 0.4 < 0.3 < 0.2 < 0.4 Sr-90 1.1 +- 0.2 1.0 +- 0.3 1.2 +- 0.3 0.7 +- 0.3 1.4 +- 0.4 0.5 +- 0.2 gamma isotopic K-40 1520 +- 70 1530 +- 50 1560 +- 80 1530 +- 80 1500 +- 60 1490 +- 60 Mn-54 < 10 < 4 < 10 < 9 < 7 < 6 Co-58 < 10 <4 < 11 < 9 < 7 < 7 Fe-59 < 22 < 9 < 21 < 19 < 16 < 18 Co-60 < 10 < 5 <.13 < 11 < 9 < 6 Zn-65 < 24 < 10 < 33 < 27 < 19 < 19 Nb-95 < 11 < 4 < 10 < 10 < 7 < 7 Zr-95 < 14 < 6 < 15 < 18 < 11 < 13 1-131 < 12 < 4 < 10 < 10 < 8 < 14 Cs-134 <9 < 3 < 10 < 10 < 8 < 6 Cs-137 < 9 < 4 < 11 < 10 < 7 < 6 Ba-140 < 37 < 13 < 34 < 34 < 27 < 41 La-140 < 13 < 6 < 15 < 9 < 11 < 14 Collection date: 07/21/08 08/12/08 09/09/08 10/14/08 11/11/08 12/16/08 1-131 < 0.2 0.9+- 0.4 < 0.2 < 0.2 Sr-90 0.8 +- 0.2 1.2 +- 0.3 1.3 +- 0.3 0.9 +- 0.3 1.1 +- 0.2 0.8 +- 0.3 gamma isotopic K-40 1500 +- 80 1630 +- 90 1570 +- 70 1400 +- 80 1430 +- 60 1480 +- 130 Mn-54 < 11 < 10 < 6 < 10 < 6 < 10 Co-58 < 11 < 11 < 7 < 11 < 5 < 8 Fe-59 < 24 < 25 < 17 < 24 < 13 < 13 Co-60 < 14 < 12 < 7 < 14 < 8 < 12 Zn-65 < 29 < 32 < 16 < 28 < 16 < 22 Nb-95 < 12 < 10 < 7 < 10 < 6 < 13 Zr-95 < 20 < 18 < 12 < 17 < 10 < 17 1-131 < 13 < 13 < 10 < 10 < 6 < 9 Cs-134 < 13 < 11 < 5 < 10 < 6 < 10 Cs-137 < 11 < 10 < 6 < 10 < 6 < 12 Ba-140 < 46 < 40 < 28 < 39 < 22 < 29 La-140 < 15 < 15 < 13 < 15 < 10 < 15 Radioisotopes other than those reported were not detected.

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a.

Table 13. Wl DHS analysis results for vegetation samples collected for the Prairie Island environmental monitoring program.

Measurements in units of pCi/kilogram (wet)

Site PRI-1 PRI-4 PRI-5 PRI-6 PRI PRI-9 Collection date: 06/03/08 06/03/08 06/03/08 06/03/08 06/03/08 06/03/08 gross alpha < 2400 < 1900 < 2000 < 2300 < 2300 < 2700 gross beta 10000 +- 1000 7300 +- 1100 5300 +- 1000 7000 4- 1200 6700 +- 1200 6200 +- 1400 gamma isotopic Be-7 490 +- 110 < 410 < 400 580 +- 90 570 +- 150 550 +- 140 K-40 5000 +- 400 4700 +- 400 4300 +- 400 5500 +- 400 4900 +- 400 5500 +- 400 Mn-54 < 51 < 45

  • 50 < 36 < 56 < 50 Co-58 < 49 < 51 < 60 < 45 < 60 < 56 Fe-59 < 110 < 120 < 130 < 60 < 130 < 170 Co-60 < 60 < 70
  • 60 < 60 < 49 < 90 Zn-65 < 130 < 160 < 250 < 100 < 120 < 130 Nb-95 < 49 < 60 < 50 < 48 < 60 < 70 Zr-95 < 80 < 100 < 90 < 70 < 110 < 90 1-131 < 60 < 60 < 49 < 40 < 60 < 80 Cs-134 < 60 < 60 < 38 < 37
  • 60 < 60 Cs-137 < 54 < 53 < 41 < 36 < 70 < 60 Ba-140 < 150 < 230 < 140 < 160 < 190 < 260 La- 140 < -90 < 70 < 90 < 100 < 80 < 70 Collection date: 09/16/08 09/16/08 09/16/08 09/16/08 09/16/08 09116/08 gross alpha < 3000 < 2300 3000 +- 2000 < 2000 < 2400 < 3000 gross beta 7400 +- 1400 7000 +- 1300 5700 +- 1200 6200 +- 1300 6700 4- 1300 5500 +- 1600 gamma isotopic Be-7 1300 +- 200 540 +- 120 1200 4- 100 1100 4- 200 1600 4- 200 1500 +- 100 K-40 5700 +- 500 6400 +- 400 5800 +- 400 5200 4- 400 6000 +- 500 5900 +- 400 Mn-54 < 60 < 60 < 52 < 70 <* 46 < 70 Co-58 < 80 < 50 < 54 < 39
  • 30 < 39 Fe-59 < 110 < 120 < 150 < 130 < 120 < 100 Co-60 < 48 < 60 < 33 < 60 < 52 < 53 Zn-65 < 180 < 160 < 160 < 140 < 150 < 130 Nb-95 < 70 < 47 < 47 < 46 < 41 < 52 Zr-95 < 90 <. 100 < 80 < 60 < 90 < 70 1-131 < 52 < 57
  • 40 < 58 < 44 < 51 Cs-134 < 70 < 52 < 42 < 56 < 58 < 58 Cs-1 37 < 60 < 52 < 45 < 80 < 50. < 60 Ba-140 < 170 < 150 < 190 < 120 < 220 < 180 La-140 < 100 < 70 < 80 < 53 < 80 < 80 Radioisotopes other than those reported were not detected.

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Table 14. WI DHS analysis results for soil samples collected for the Prairie Island environmental monitoring program.

Measurements in units of pCi/kilogram (dry)

PRI-4 PRI-5 PRI-6 PRI-8 PRI-9 Site PRI-1 06/03/08 06103/08 06/03/08 06/03/08 06/03108 Collection date: 06/03/08

< 8000 < 8000 10000 +- 8000 14000 +- 8000 < 8000 gross alpha < 8000 14000 +- 4000 22000 +- 4000 24000 +- 4000 14000 +- 4000 gross beta 12000 +- 4000 13000 +- 4000 gamma isotopic 12400 +- 500 15500 +- 600 15800 +- 600 10700 +- 400 K-40 11300 +- 500 11400 +- 600

< 50 < 46 < 51 < 16 Mn-54 < 33 < 34

< 36 < 48 < 49 < 20 Co-58 < 42 < 27

< 120 < 130 < 52 Fe-59 < 120 < 47 < 110

< 70 < 55 < 55 < 25 Co-60 < 41 < 34

< 180

  • 210 < 250 < 43 Zn-65 < 140 < 80

< 39 < 46 < 50 < 25 Nb-95 < 48 < 36

< 80 < 70 < 34 Zr-95 < 70 < 55 < 80

< 60

  • 60 < 80 < 20 Cs-1 34 < 60 < 28 170 +- 20 260 +- 20 90 +- 20 190 +- 12 Cs-137 420 +- 20 163 +- 16 09/16/08 09/16/08 09/16/08 09/16/08 Collection date: 09/16/08 09/16/08

< 8000 11000 +- 8000 < 8000 gross alpha < 8000 < 8000 < 8000 4000 16000 +- 4000 20000 +- 4000 14000 +- 4000 gross beta 17000 +- 4000 16000 +- 4000 13000 +-

gamma isotopic 11700 400 15000 +- 500 14600 +- 500 12200 +- 400 K-40 15100 +- 600 12600 +- 400 4-

< 16 < 18 < 13 Mn-54 < 56 < 13 < 14

  • 44 13 < 16 < 15 < 12 Co-58 < 12 <

< 43 < 35 < 33 Fe-59 < 130 < 30 < 30

< 14 < 16 < 18 < 15 Co-60 < 60 < 11

< 250 < 34 < 40 < 42 < 41 < 31 Zn-65

< 13 < 15 < 18 < 18 < 14 Nb-95 < 48

< 80 < 18 < 22 < 31 < 28 < 25 Zr-95

< 9 < 10 < 12 < 12 < 9 Cs-134 < 70 170 +- 10 140 +- 10 206 +- 14 130 +- 13 190 +- 11 Cs-137 150 +- 20 8 212 212 214 214 Bi), lead-212 ( Pb) from the naturally occurring Naturally occurring radioisotopes such232as radium-226 (226Ra), bismuth-214 ( Bi), lead-214 ( Pb), actinium-228 (22Ac), bismuth-212 (

uranium-238 (238U) and thorium-232 ( Th) decay series are commonly detected but have not been quantified or reported.

Radioisotopes other than those reported were not detected.

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