ML22068A248
| ML22068A248 | |
| Person / Time | |
|---|---|
| Site: | 07000754 |
| Issue date: | 03/05/2022 |
| From: | GE-Hitachi Nuclear Energy Americas |
| To: | Office of Nuclear Material Safety and Safeguards |
| Shared Package | |
| ML22068A246 | List: |
| References | |
| M220022 | |
| Download: ML22068A248 (29) | |
Text
EFFLUENT MONITORING AND ENVIRONMENTAL SURVEILLANCE PROGRAMS ANNUAL REPORT 2021 (Revision 0)
March 5, 2022 GE Hitachi Nuclear Energy, LLC
M220022 US NRC 3/5/2022 NOTICE AND DISCLAIMER The GEHitachi Nuclear Energy, LLC (GEH) prepared this document. GEH and contributors to this document do not:
make any warranty or representation, expressed or implied, that the use of any information disclosed may not infringe privately owned rights; or assume responsibility for liability or damage of any kind, which may result from the use of any information disclosed.
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M220022 US NRC 3/5/2022 TABLE OF CONTENTS TABLE OF CONTENTS ..................................................................................................................................................... ii LIST OF FIGURES AND TABLES....................................................................................................................................... iii ABSTRACT ..................................................................................................................................................................... iv
1.0 INTRODUCTION
........................................................................................................................................................ 1 1.1 Effluent Monitoring Program 1 1.2 Environmental Surveillance Program 2 2.0 EFFLUENT MONITORING DATA ................................................................................................................................4 Effluent Data 4 3.0 ENVIRONMENTAL SURVEILLANCE DATA ............................................................................................................... 13 3.1 Groundwater 13 3.2 Stream Bottom Sediments 13 3.3 Vegetation 13 3.4 Gamma Monitoring 13 3.5 Ambient Air Monitoring 13 3.6 Gaseous Effluent Monitoring 13
4.0 REFERENCES
...........................................................................................................................................................14 4.1 United States Nuclear Regulatory Commission (USNRC) License SNM960 14 4.2 United States Nuclear Regulatory Commission (USNRC) License R33 14 4.3 State of California Radiologic Health Branch License 001701 14 5.0 DEVIATIONS ...........................................................................................................................................................15 5.1 Lost Environmental Dosimetry Badges 15 6.0
SUMMARY
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M220022 US NRC 3/5/2022 LIST OF FIGURES AND TABLES Figure No.
1 Topographic Map Of VNC 2 Sanitary and Industrial Discharge Treatment Facility 3 Water Sampling Locations 4 Air Sampling Locations and Gamma Monitoring Points 5 Analytical Results, Air Samples 6 Analytical Results, Stack Monitoring (Stack 4, Bldg. 102) 7 Analytical Results, Stack Monitoring (Stack 16, NTR) 8 Analytical Results, Stack Monitoring Composite (All Except Stacks 4 And 16)
Table No.
1 Sample Collection Schedule 2 Groundwater Well Information 3 Stack Specifications 4 Radiological Effluent Samples 5 Ground Water Samples 6 Stream Bottom Sediment Samples 7 Vegetation Samples 8 Storm Water Samples 9 Dosimetry Results - Gamma Monitoring 10 Ambient Air Monitoring iii
M220022 US NRC 3/5/2022 ABSTRACT Annual, 2021 This report presents the data collected for the calendar year of 2021. The original copies of laboratory reports are on file at VNC.
Treated sanitary and industrial wastewater was disposed of onsite by an irrigation system. No surface runoff of sanitary or industrial wastes was observed during the report period.
Based on the analytical results of radiological samples collected from locations on and offsite during the reporting period, VNC is in compliance with licenses issued by the U.S. Nuclear Regulatory Commission and California Department of Health, Radiologic Health Branch.
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M220022 US NRC 3/5/2022
1.0 INTRODUCTION
This report summarizes activities performed and data collected for the Effluent Monitoring and Environmental Surveillance Programs at Vallecitos Nuclear Center (VNC). Section 1.0 presents background information. Data collected during the reporting period is presented in Section 2.0 through 4.0. This report has been prepared to demonstrate compliance with state and federal requirements.
The VNC site is several hundred acres in size. It is located on the northern side of Vallecitos Valley as shown in Figure 1, a topographic map of VNC and the surrounding area. Most of the site is undeveloped with hills ranging in elevation from approximately 1,000 to 1,300 feet above mean sea level. Approximately 135 acres in the southwest corner and situated between the 400 and 600 foot topographic contours are developed. The ground surface of this portion of the site slopes to the southwest.
VNC utilizes three drainage systems: industrial, sanitary, and storm. The industrial and sanitary systems discharge nonrad effluent into one of four 50,000gallon retention basins located in the southwest corner of the site (Figure 2). The storm drainage system, essentially natural ditches, discharges storm water into a ditch parallel with Vallecitos Road (State Route 84). Storm drains from Buildings 103, 104, and 106 discharge to the west drainage ditch, while some storm drains in the Building 102, 105, 200, and 300 areas discharge to the east drainage ditch.
As shown in Figures 2 and 3, these ditches merge prior to exiting the southwest corner of the site.
Groundwater levels of the developed site vary from 2 to 3 feet below ground surface (during winter near Retention Basins 2 and 3) to 30 to 40 feet (during the summer northwest of the road leading to the water tank). A USGS geology study shows that groundwater generally flows toward the southwest. The velocity of groundwater is estimated by USGS to be about 0.01 ft/day in clays to 8 ft/day in gravels. In areas where gravels with a considerable mixture of clay (most of developed site) are saturated close to the land surface, southwesterly movement occurs at an average rate of approximately 2 ft/day1.
1.1 Effluent Monitoring Program The purpose of the Effluent Monitoring Program is to ensure that VNC site release limits for effluent are not exceeded. The Program includes measuring radioactive constituents in water discharged through the site sanitary and industrial wastewater systems. Measurements are determined by collecting samples of effluent. The schedule of sample collection is presented in Table 1.
The United States Nuclear Regulatory Commission (NRC) have established radiological release limits. These limits are listed in 10CFR20, Appendix B.
Effluent Characteristics Effluent discharge from VNC is made up of industrial wastewater and clean water. Discharges of industrial wastewater consist primarily of noncontact cooling water. The discharges are either held in one of three available 50,000gallon retention basins and or used for nonpotable purposes, such as landscape watering. After July 1st, 2003 no discharges to surface waters have been made from these sources. Samples are collected from each basin prior to discharge to onsite irrigation. In addition, samples from all basin discharges are accumulated and analyzed at specified intervals for a variety of constituents.
Discharges of clean water consist of storm water runoff and small quantities of water known to contain no contaminants. These waters flow directly to drainage ditches that enter Vallecitos Creek.
Sanitary Waste Handling Sanitary waste (sludge) is collected in an Imhoff tank before undergoing sand filtration and chlorination (by addition of sodium hypochlorite solution). Samples of sanitary waste (sludge) are collected before each Imhoff Tank cleanout. There were no cleanouts performed on the Imhoff tank during 2020. Processed sanitary 1
A delay of over 2 years from the nearest postulated spill point to the site boundary.
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M220022 US NRC 3/5/2022 wastewater is sprayed onto VNC property by an irrigation system in a designated area (Figure 2). The procedure is monitored so that no surface runoff occurs.
Gaseous Effluent Monitoring Several operations at the site utilize exhaust stacks. Air is collected from single or multiple operating areas via a ventilation system. The ventilation system is generally comprised of ductwork, particulate filtration systems, blowers, and an exhaust stack. The gaseous effluent is monitored. The specifications of each stack are listed in Table 3.
The various site operating licenses (SNM960, R33, and State 001701) and federal regulations require that the gaseous effluents released to unrestricted areas be limited and controlled to maintain the concentrations of radioactive material in the unrestricted area as low as reasonably achievable but at least no greater than the values in Appendix B, Table II of 10CFR20.
The method by which releases are determined to be within these limits is to establish average release limits and control values for each stack and then measure the average releases through monitoring and/or sampling of the effluents. The control values are, in general, established as 10% of the license release limits.
Both sampling and monitoring techniques are used to determine gaseous effluent releases. Release results reported to regulatory agencies for particulates and halogens are obtained from sampling systems. Noble gas results are obtained from charts or electronic integrators on monitoring equipment.
The COMPLY computer code is run to determine the dose at the site boundary from annual airborne effluents.
This evaluation was formerly required when 40CFR61 Subpart I applied to NRC licensees, which included VNC. The regulation was amended to exclude NRC licensees. However, VNC has continued to run the COMPLY code to demonstrate compliance with the constraint rule per Regulatory Guide 4.20 and 10CFR20.1101d and with annual public dose limits per 10CFR20.1301, Dose Limits for Individual Members of the Public.
1.2 Environmental Surveillance Program The purpose of the Environmental Surveillance Program is to determine if discharges from VNC are detectable in the environment. The Program includes measuring radioactive constituents in neighboring streams, wells, and soils at locations near or beyond the site perimeter. Samples of groundwater, stream bottom sediments, and vegetation are collected. The schedule of sample collection is presented in Table 1.
Groundwater Monitoring Groundwater is monitored by collecting and analyzing samples from eight wells located on or near VNC. Samples are analyzed for radiological contaminants. Well identification numbers, corresponding California State Well Numbers, and descriptions of locations are listed in Table 2.
Vegetation Monitoring Vegetation is monitored by collecting and analyzing samples of vegetation at two locations designated V2 and Val IV.
Station Description V2 Easternmost stream crossing south boundary of site VALIV West of site boundary, 500 feet down Little Valley Road Stream Bottom Sediment Monitoring Stream bottom sediment is monitored by collecting and analyzing samples at one location designated as S4. The location is at the outfall of the retention basins at south boundary of site.
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M220022 US NRC 3/5/2022 Air Monitoring There are four air monitoring stations, designated as A1 through A4, across the site. The stations are positioned approximately 90 apart around the operating facilities of the site. The locations of the stations are shown in Figure 4.
To collect samples, each station is equipped with a membrane filter and an activated charcoal cartridge. The filter is changed weekly2 and counted for gross alpha and gross beta radiation. The cartridge is removed and analyzed only in the event of a suspected radioactive iodine release.
Gamma Monitoring There are 20 monitoring stations on site for measuring gamma radiation in the environment. Each station is constructed of a steel mailbox and equipped with a dosimeter. The dosimeter is sealed in plastic. The dosimeters are exchanged annually. The locations of the stations are shown in Figure 4.
For reporting purposes, the dosimeters are distributed as follows:
South Boundary Stations 1, 2, 3 East Boundary Stations 4,5,6 North Boundary Stations 7,12,13 West Boundary Stations 8,9,10,11 Background Dosimeters Stations 14,15,16,17,18,19,20 The dosimeter vendor reports the measurements of each dosimeter and determines the background measurement. Background is determined by using a dosimeter that has been exposed to background radiation at this facility and is from the same batch of OSL material as the dosimeters exposed at VNC.
1.3 Laboratory Analyses Onsite and external laboratories perform the analyses of samples collected at VNC as required for the programs.
Samples analyzed by the onsite laboratory are reported as measured value or less than minimum detectable activity (MDA) values, while samples analyzed by the external laboratories are reported as actual measured values.
Values within the statistical background may be listed as zero or as a positive or negative numbers. All analyses are performed using approved USEPA methodology with minimum sensitivities equal to or less than permit limits.
All records of analytical results are maintained at VNC.
Onsite Laboratory Analyses The following list of analyses are performed by the onsite laboratory:
Total AlphaEmitting Radioactivity Total BetaEmitting Radioactivity Offsite Laboratory Analyses The external laboratories that have been contracted to analyze samples collected for the program are: GEL, located in Charleston, South Carolina, to perform radiological analyses on samples of water, and Davi Lab, located in Hercules, California, to perform radiological analyses on samples of water, stream bottom and vegetation.
2 During dusty conditions, the filters are changed as determined by the RMT, Facilities Protection.
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M220022 US NRC 3/5/2022 2.0 EFFLUENT MONITORING DATA This section presents the discharge information and analytical results for samples collected for the Effluent Monitoring Program during the reporting period.
Effluent Data Compliance Summary Required samples collected during the reporting period and the analytical results of tests are in compliance with Permit limits. Treated sanitary and industrial wastewater was disposed of onsite by an irrigation system. No surface runoff of sanitary or industrial waste occurred during the report period.
Based on the analytical results of radiological samples collected from locations on and offsite during the reporting period, VNC is in compliance with all licenses issued by the U.S. Nuclear Regulatory Commission and California Department of Health, Radiologic Health Branch.
Nonradiological Analytical Results Summaries of data relating to nonradioactive effluent parameters are given in Table 5 through 9. The results indicate that all constituents of concern are in compliance with regulatory limits.
Table 4 Sample Analysis Results of sampling of industrial effluent waters for radiological contaminates prior to release from the property is summarized in Table 4. The VNC has no radiological liquid effluent pathways and sampling for radiological contamination in industrial effluent is not required by the State of California. The provided monthly specific activities are summed totals from samples taken of daily water releases. Entries of zero (0) indicate results below the detection limits of laboratory instruments. No radiation was detected that exceeded regulatory limits.
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M220022 US NRC 3/5/2022 3.0 ENVIRONMENTAL SURVEILLANCE DATA This section presents the analytical results for samples of ground water, stream bottom sediments, and vegetation collected for the Environmental Surveillance Program during the reporting period.
3.1 Groundwater Analytical results of groundwater samples collected from the wells as indicated in Table 2 during the reporting period are listed in Table 5.
3.2 Stream Bottom Sediments Analytical results of stream bottom sediment samples collected during the reporting period are listed in Table 6.
3.3 Vegetation Analytical results of vegetation samples collected during the reporting period are listed in Table 7.
3.4 Gamma Monitoring The results of gamma monitoring during the reporting period are listed in Table 8.
3.5 Ambient Air Monitoring Analytical results of environmental air samples collected during the reporting period are graphically presented in Figure 5, data in Table 9.
3.6 Gaseous Effluent Monitoring Stack Monitoring Analytical results of gaseous effluent samples collected for stack monitoring during the reporting period are graphically presented in Figures 6 through 8.
Effective Dose Equivalent The calculated Effective Dose Equivalent at Screening Level 2 resulting from the annual measured releases, as calculated by the Comply Code, are:
Property Line 0.5 mRem/year due to all emissions, and 3.4E04 mRem/year from iodine.
Site Developed Area 3.3 mRem/year due to all emissions, and 2.3E03 mRem/year from iodine.
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4.0 REFERENCES
This section has the references that are required to be met by this Environmental Monitoring Report.
Licenses 4.1 United States Nuclear Regulatory Commission (USNRC) License SNM960 4.2 United States Nuclear Regulatory Commission (USNRC) License R33 4.3 State of California Radiologic Health Branch License 001701 14
M220022 US NRC 3/5/2022 5.0 DEVIATIONS This section presents anomalies, deficiencies or deviation in adherence to the Effluent Monitoring and Environmental Surveillance Programs at VNC for the reporting period.
5.1 Lost Environmental Dosimetry Badges Condition Report Number 38540. Badge number 1 was not found.
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M220022 US NRC 3/5/2022 6.0
SUMMARY
This section presents a summary of the results of the water Monitoring Program for the reporting period.
The analytical results of radiological samples collected during the reporting period indicate that effluent discharges from VNC were in compliance with Water Permit limits and airborne releases were in compliance with licenses issued by the U.S. Nuclear Regulatory Commission.
Additionally, neither surface runoff of processed sanitary wastewater, nor industrial wastewater was observed.
The Effluent Monitoring and Environmental Surveillance Programs continue to be effective.
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M220022 US NRC 3/5/2022 TABLE 1. SAMPLE COLLECTION SCHEDULE Designation Constituent Sample Type Frequency Location E001 and E002 Gross Alpha Grab Each discharge (Basin 1 - 4) Gross Beta Grab Each discharge Gross Alpha Composite Monthly Gross Beta Composite Monthly Station E003 Gross Alpha Grab Twice each half of reporting year (Storm Water) Gross Beta Grab Twice each half of reporting year Tritium Grab Twice each half of reporting year S4 Gross Alpha Grab Annually, usually First week in May Stream Bottom Gross Beta Grab Annually, usually First week in May (Sediments) Co60, Cs137 V2 & VAL IV Gross Alpha Grab Annually, usually First week in April (Vegetation) Gross Beta Grab Annually, usually First week in April Groundwater Gross Alpha Grab Quarterly Wells Gross Beta Grab Quarterly Tritium Grab Quarterly Sr90 Grab Quarterly
M220022 US NRC 3/5/2022 TABLE 2 - GROUNDWATER WELL INFORMATION Site Well No. California State Well No. Location Description GN 4S/1E2N1 Southeast of Building 105 GA 4S/1E10A1 Southwest of Building 102 GP 4S/1E10P3 0.6 miles southwest of site entrance on private property MW1 4S/1E3R2 Bldg. 102 Parking Lot MW7 4S/1E10G3 Southwest from Basins MW8 4S/1E2M01 Southwest of GETR Reactor MW9S 4S/1E2P1 Southwest of EVESR and VBWR Reactors MW9D 4S/1E2P2 Southwest of EVESR and VBWR Reactors EVESRSE NA 20 ft east of EVESR at southwest exterior corner
M220022 US NRC 3/5/2022 TABLE 3 - STACK SPECIFICATIONS Flow Stack Height Diameter Rate Number Location Components Serviced (feet ags) (inches) (cfm) 4 Bldg. 102A Remote Handling Operation, 75 66 Isotope Production Facility, 36,302.6 Radiochemistry, Remote Handling Operations Radioactive Materials Storage Room 12 Bldg. 103 Metallurgy and Ceramics 48 60 25,987.7 Laboratories, Chemistry Laboratories 16 Bldg. 105 Nuclear Test Reactor 45 13.5x13.5 1,536.7 26 Area 200 General Electric Test Reactor 29 19 NA (GETR) 30 Waste Liquid Waste Evaporator 25 13x17.75 2,988.8 Evaporator 34 Waste Waste Storage Facility 25 13x17.75 NA Storage (Sandblast Room) 37 HSF Bunker Bunker Area of Hillside Storage 40 35 NA Facility Notes:
ags - above ground surface cfm - cubic feet per minute Stacks 26, 34, and 37 did not operate during 2021.
M220022 US NRC 3/5/2022 TABLE 4 - MONTHLY EFFLUENT SAMPLES, E002L Action Levels Gross Alpha (3.0x108 µCi/cc = 30 pCi/l) Gross Beta (5.0x108 µCi/cc = 50 pCi/l)
Contract Service Data Contract Service Data Monthly Effluent (Industrial) Monthly Effluent (Sanitary)
Composite Sample (pCi/L) Composite Sample (pCi/L)
Gross Gross Gross Alpha Gross Month Alpha Beta Tritium Beta Tritium January No Discharge No Discharge February 2.48 1.57 371 3.71 1.63 201 March 1.08 2.42 24 No Discharge April 1.84 6.14 413 No Discharge May 4.28 1.77 437 2.92 2.98 233 June ND 0.79 183 No Discharge July 3.23 1.85 444 No Discharge August 4.30 4.31 434 No Discharge September 1.55 2.52 26 No Discharge October 1.23 3.85 578 No Discharge November 4.96 4.16 531 No Discharge December 4.15 2.62 633 2.11 5.39 485 Footnotes for Table 4:
[1] There were no sanitary discharges made during months of January, March, April, June, July, August, September, October, and November.
M220022 US NRC 3/5/2022 TABLE 5 - QUARTERLY GROUND WATER SAMPLES Action Levels Gross Alpha (3.0x108 µCi/cc = 30 pCi/l) Gross Beta (5.0x108 µCi/cc = 50 pCi/l)
Quarterly 4S/1E-2N1 (GN) 4S/1E-10A1 (GA) 4S/1E-10P3 (GP)
(pCi/L) (pCi/L) (pCi/L)
Gross Gross Gross Gross Gross Gross Month Sr-90 Tritium Sr-90 Tritium Sr-90 Tritium Alpha Beta Alpha Beta Alpha Beta February'21 1.80 1.37 0.05 469 3.86 2.06 0.30 112 2.60 2.12 0.10 604 May'21 3.95 1.35 0.44 41 2.11 1.60 0.32 808 1.19 4.00 0.32 478 August' 21 3.71 2.63 0.61 62 4.70 2.94 0.75 138 4.20 3.00 0.94 452 November' 21 2.51 3.09 0.00 445 4.08 2.90 0.81 246 4.89 1.71 0.70 405 Annual Average 2.99 2.11 0.28 254 3.69 2.38 0.55 326 3.22 2.71 0.52 485
M220022 US NRC 3/5/2022 TABLE 5 - QUARTERLY GROUND WATER SAMPLES Action Levels Gross Alpha (3.0x108 µCi/cc = 30 pCi/l) Gross Beta (5.0x108 µCi/cc = 50 pCi/l)
Quarterly Sample MW-8 (4S-1E2M01) MW-9S (4S-1E2P1)
(pCi/l) (pCi/l)
Gross Gross Gross Gross Sr-90 Tritium Sr-90 Tritium Month Alpha Beta Alpha Beta February' 21 1.90 1.49 0.35 619 1.85 1.62 0.51 200 May' 21 2.70 1.00 0.00 857 4.45 1.52 0.21 631 August' 21 4.56 2.80 0.58 467 4.90 2.46 0.65 453 November'21 4.59 2.66 0.65 398 0.98 3.64 0.13 161 Annual Average 3.44 1.99 0.40 585 3.05 2.31 0.38 361 Quarterly Sample MW-9D (4S-1E2P2) EVESR-SE (pCi/l) (pCi/l)
Gross Gross Gross Gross Sr-90 Tritium Sr-90 Tritium Month Alpha Beta Alpha Beta February' 21 1.21 1.05 0.65 286 3.84 1.74 0.00 190 May' 21 1.39 1.80 0.05 7 5.77 1.90 0.05 323 August' 21 4.77 3.13 0.81 108 4.38 2.72 0.71 0 November'21 2.77 3.35 0.16 204 2.23 2.95 0.16 304 Annual Average 2.54 2.33 0.42 151 4.06 2.33 0.23 204 Annual Sample MW-1 (1E-3R2) MW-7 (1E-10G3)
(pCi/l) (pCi/l)
Gross Alpha Gross Beta Sr-90 Tritium Gross Gross Sr-90 Tritium Month Alpha Beta May' 21 6.51 1.88 0.94 170 5.81 1.49 0.74 163
M220022 US NRC 3/5/2022 TABLE 6 - STREAM BOTTOM SEDIMENT SAMPLES Sample Date Gross Gross Co60 Cs137 Number Collected (Ci/g) (Ci/g) (Ci/g) (Ci/g)
Action Level 30 N/A 8 15 S-4 4/30/2021 4.73 1.60 0.00 0.00 TABLE 7 - VEGETATION SAMPLES Sample Date Gross Gross Number Collected (Ci/g) (Ci/g)
Action level 10 50 Val-2 3/21/2021 0.21 0.26 Val-IV 3/21/2021 0. 18 0.55 TABLE 8 - STORM WATER Sample Date Gross Gross Tritium Number Collected (Ci/g) (Ci/g) (Ci/g)
Action Level 30 50 N/A SW 1/28/2021 3.23 2.53 90 TABLE 9 - DOSIMETRY RESULTS
M220022 US NRC 3/5/2022 GAMMA MONITORING 2021
Background
South Boundary East Boundary West Boundary North Boundary Dosimeters Station Station Station Station Station No. (mRem/yr) No. (mRem/yr) No. (mRem/yr) No. (mRem/yr) No. (mRem/yr) 1 Missing 4 76.9 7 81.4 8 83.8 14 78.9 2 79.2 5 77.5 12 80.8 9 70.1 15 86.3 3 78.6 6 85.3 13 81.3 10 72.2 16 77.2 11 81.3 17 85.1 18 79.7 19 72.8 20 76.7 Notes:
- Dose > Control Dosimeter See Figure 4 for location.
The dosimeters at each station were collected on December 18, 2021.
Gross Values Represented (No background subtracted from control readings).
Control Dosimeter reads 91.0 mRem/yr (Control Badge is in building 102B).
TABLE 10 - AMBIENT AIR MONITORING Action Levels Beta (6.6x1014) Alpha (5.9x1014) 2021 ENVIRONMENTAL STATIONS, uCi/ml MONTH STATION ONE STATION TWO STATION THREE STATION FOUR (average) BETA ALPHA BETA ALPHA BETA ALPHA BETA ALPHA JAN 4.03E-14 7.66E-16 3.68E-14 1.00E-15 4.35E-14 8.96E-16 3.62E-14 8.28E-16 FEB 2.52E-14 7.30E-16 2.07E-14 4.25E-16 2.20E-14 5.02E-16 2.59E-14 8.73E-16 MAR 2.92E-14 6.60E-16 2.90E-14 8.15E-16 3.41E-14 8.90E-16 3.69E-14 1.07E-15 APR 3.01E-14 1.16E-15 2.80E-14 1.06E-15 4.00E-14 1.17E-15 4.12E-14 1.41E-15 MAY 1.57E-14 5.40E-16 1.26E-14 7.18E-16 2.31E-14 5.85E-16 2.51E-14 6.11E-16 JUN 9.39E-15 2.64E-16 9.54E-15 2.87E-16 1.48E-14 4.60E-16 1.49E-14 3.73E-16 JUL 1.84E-14 7.87E-16 1.73E-14 9.02E-16 2.17E-14 1.07E-15 1.96E-14 1.01E-15 AUG 2.43E-14 1.18E-15 1.92E-14 1.14E-15 2.37E-14 9.31E-16 2.53E-14 1.03E-15 SEP 3.35E-14 1.38E-15 2.87E-14 1.17E-15 3.90E-14 1.65E-15 3.44E-14 1.60E-15 OCT 3.09E-14 9.58E-16 2.98E-14 8.84E-16 3.66E-14 1.30E-15 3.02E-14 1.32E-15 NOV 3.04E-14 6.24E-16 3.92E-14 1.04E-15 3.35E-14 7.67E-16 2.95E-14 8.09E-16 DEC 5.46E-14 2.25E-15 6.47E-14 2.58E-15 5.53E-14 2.51E-15 4.81E-14 2.17E-15 AVERAGE 2.85E-14 9.41E-16 2.80E-14 1.00E-15 3.23E-14 1.06E-15 3.06E-14 1.09E-15 Notes: See Figure 4 for location See Figure 5 for graphical representation Some individual weekly air samples exceeded the gross beta action levels. In each case, the sample was recounted and analyzed via gamma spectroscopy. No plant related radionuclides were identified.