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{{Adams
| number = ML11157A035
| issue date = 04/30/2011
| title = Annual Radiological Environmental Operating Report for the Year 2010
| author name = 
| author affiliation = Exelon Generation Co, LLC, Exelon Nuclear
| addressee name = 
| addressee affiliation = NRC/NRR
| docket = 05000352, 05000353
| license number = 
| contact person = 
| document type = Annual Operating Report, Environmental Monitoring Report
| page count = 116
}}

=Text=
{{#Wiki_filter:Docket No:    50-352 50-353 LIMERICK GENERATING STATION UNITS 1 and 2 Annual Radiological Environmental Operating Report 1 January Through 31 December 2010 Prepared By Teledyne Brown Engineering Environmental Services Exel Wns.
Nuclear Limerick Generating Station Sanatoga, PA 19464 April 2011

Table Of Contents I. Sum m ary and Conclusions ...........................................................................................                   1 I1. Introduction ........................................................................................................................ 3 A. O bjectives of the REM P ...................................................................................                    3 B. Im plem entation of the O bjectives .....................................................................                       4 II1. Program Description .....................................................................................................             4 A. Sam ple Collection .............................................................................................                4 B. Sam ple Analysis ................................................................................................               6 C. Data Interpretation ...........................................................................................                 6 D. Program Exceptions ........................................................................................                     8 E. Program Changes .............................................................................................                   9 IV. Results and Discussion ...............................................................................................                 9 A. Aquatic Environm ent ........................................................................................                   9
: 1. Surface W ater .........................................................................................                9
: 2. Drinking W ater ......................................................................................                   9
: 3. Fish .......................................................................................................            10
: 4. Sedim ent ..............................................................................................                10 B. Atm ospheric Environm ent ...............................................................................                      11
: 1. Airborne ...............................................................................................               11
: a. Air Particulates ..........................................................................                11
: b. Airborne Iodine ..........................................................................                 12
: 2. Terrestrial .............................................................................................               12
: a. Milk ...........................................................................................           12
: b. Broad Leaf Vegetation ..............................................................                       12 C. Am bient Gam m a Radiation ............................................................................                        13 D. 10 CFR 20.2002 Perm it Storage Area ............................................................                               13 E. Independent Spent Fuel Storage Installation ..................................................                                 13 F. Land Use Survey .............................................................................................                  13 G. Summary of Results - Inter-Laboratory Comparison Program ......................                                                14 V. References ....................................................................................................................... 15

Appendices Appendix A   Radiological Environmental Monitoring Report Summary Tables Table A-1    Radiological Environmental Monitoring Program Annual Summary for the Limerick Generating Station, 2010.
Appendix B   Location Designation, Distance & Direction, and Sample Collection &
Analytical Methods Tables Table B-I:  Location Designation and Identification System for the Limerick Generating Station.
Table B-2:  Radiological Environmental Monitoring Program - Sampling Locations, Distance and Direction, Limerick Generating Station, 2010.
Table B-3:  Radiological Environmental Monitoring Program - Summary of Sample Collection and Analytical Methods, Limerick Generating Station, 2010.
Ficgures Figure B-1: Environmental Sampling Locations Within 5,280 Feet of the Limerick Generating Station, 2010.
Figure B-2: Environmental Sampling Locations Between 5,280 and 26,400 Feet from the Limerick Generating Station, 2010.
Figure B-3: Environmental Sampling Locations Greater Than 26,400 Feet from the Limerick Generating Station, 2010.
Appendix C   Data Tables and Figures - Primary Laboratory Tables Table C-1.1  Concentrations of Tritium in Surface Water Samples Collected in the Vicinity of Limerick Generating Station, 2010.
Table C-1.2  Concentrations of Gamma Emitters in Surface Water Samples Collected in the Vicinity of Limerick Generating Station, 2010.
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Table C-I1.1   Concentrations of Gross Beta in Drinking Water Samples Collected in the Vicinity of Limerick Generating Station, 2010.
Table C-II.2   Concentrations of Tritium in Drinking Water Samples Collected in the Vicinity of Limerick Generating Station, 2010.
Table C-II.3   Concentrations of Gamma Emitters in Drinking Water Samples Collected in the Vicinity of Limerick Generating Station, 2010.
Table C-II1.1  Concentrations of Gamma Emitters in Predator and Bottom Feeder (Fish) Samples Collected in the Vicinity of Limerick Generating Station, 2010.
Table C-IV.1   Concentrations of Gamma Emitters in Sediment Samples Collected in the Vicinity of Limerick Generating Station, 2010.
Table C-V.1    Concentrations of Gross Beta in Air Particulate Samples Collected in the Vicinity of Limerick Generating Station, 2010.
Table C-V.2    Monthly and Yearly Mean Values of Gross Beta Concentrations in Air Particulate Samples Collected in the Vicinity of Limerick Generating Station, 2010.
Table C-V.3    Concentrations of Gamma Emitters in Air Particulate Samples Collected in the Vicinity of Limerick Generating Station, 2010.
Table C-VI.1   Concentrations of 1-131 in Air Iodine Samples Collected in the Vicinity of Limerick Generating Station, 2010.
Table C-VII.1  Concentrations of 1-131 in Milk Samples Collected in the Vicinity of Limerick Generating Station, 2010.
Table C-VII.2  Concentrations of Gamma Emitters in Milk Samples Collected in the Vicinity of Limerick Generating Station, 2010.
Table C-VIII.1 Concentrations of Gamma Emitters in Broad Leaf Vegetation Samples Collected in the Vicinity of Limerick Generating Station, 2010.
Table C-IX.1   Quarterly TLD Results for Limerick Generating Station, 2010.
Table C-IX.2   Mean Quarterly TLD Results for the Site Boundary, Middle and Control Locations for Limerick Generating Station, 2010.
Table C-IX.3   Summary of the Ambient Dosimetry Program for Limerick Generating Station, 2010.
Figures Figure C-1     Mean Monthly Total Gross Beta Concentrations in Drinking Water Samples Collected in the Vicinity of LGS, 1982 - 2010.
Figure C-2     Mean Annual Cs-137 Concentrations in Fish Samples Collected in the Vicinity of LGS, 1982 - 2010.
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Figure C-3    Concentrations of Cs-137 in Sediment Samples Collected in the Vicinity of LGS, 1982 - 2010.
Figure C-4    Mean Monthly Gross Beta Concentrations in Air Particulate Samples Collected in the Vicinity of LGS, 1982 - 2010.
Figure C-5    Mean Weekly Gross Beta Concentrations in Air Particulate Samples Collected in the Vicinity of LGS, 2010.
Figure C-6    Mean Quarterly Ambient Gamma Radiation Levels (TLD) in the Vicinity of LGS, 1985- 2010.
Appendix D    Data Tables and Figures - Comparison Laboratory Tables Table D-1.1   Concentrations of Total Gross Beta in Drinking Water Samples Collected in the Vicinity Of Limerick Generating Station, 2010.
Table D-1.2   Concentrations of Tritium in Drinking Water Samples Collected in the Vicinity Of Limerick Generating Station, 2010.
Table D-1.3   Concentrations of Gamma Emitters in Drinking Water Samples Collected in the Vicinity of Limerick Generating Station, 2010.
Table D-11.1  Concentrations of Gross Beta in Air Particulate Samples Collected in the Vicinity of Limerick Generating Station, 2010.
Table D-11.2  Concentrations of Gamma Emitters in Air Particulate Samples Collected in the Vicinity of Limerick Generating Station, 2010.
Table D-Ill.1 Concentrations of 1-131 by Chemical Separation and Gamma Emitters in Milk Samples Collected in the Vicinity of Limerick Generating Station, 2010.
Figures Comparison of Monthly Total Gross Beta Concentrations in Drinking Figure D-1 Water Samples Split Between ENV and TBE, 2010.
Figure D-2    Comparison of Weekly Gross Beta Concentrations in Air Particulate Samples Collected from LGS Collocated Locations 11S1 and 11S2, 2010.
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Appendix E Inter-Laboratory Comparison Program Tables Table E-1  Analytics Environmental Radioactivity Cross Check Program Teledyne Brown Engineering, 2010.
Table E-2  ERA Environmental Radioactivity Cross Check Program Teledyne Brown Engineering, 2010.
Table E-3  DOE's Mixed Analyte Performance Evaluation Program (MAPEP)
Teledyne Brown Engineering, 2010.
Table E-4  ERA Statistical Summary Proficiency Testing Program Environmental, Inc., 2010.
Table E-5  DOE's Mixed Analyte Performance Evaluation Program (MAPEP)
Environmental, Inc., 2010.
Appendix F Annual Radiological Groundwater Protection Program Report (ARGPPR) v

Intentionally Left Blank vi

I.       Summary and Conclusions In 2010, the Limerick Generating Station released to the environment through the radioactive effluent liquid and gaseous pathways approximately 73 curies of noble gas, fission and activation products and approximately 51curies of tritium.
The dose from both liquid and gaseous effluents was conservatively calculated for the Maximum Exposed Member of the Public. The results of those calculations and their comparison to the allowable limits were as follows:
Gaseous and liquid radiation doses to members of the public at locations Effluent          Applicable          Estimated        Age           Location              % of    Limit Unit Organ               Dose         Group                             Applicable Limit Noble  Gas     Gamma - Air Dose             4.04E-03         All     Nearest  Residence       2.OOE-02   20   mRad Noble  Gas     Beta - Air Dose              2.40E-03         All     Nearest  Residence       6.00E-03   40   mRad Noble  Gas     Total Body (Gamma)           3.83E-03         All     Nearest  Residence       3.80E-02   10   mrem Noble  Gas     Skin (Beta)                  6.39E-03         All     Nearest  Residence       2.10E-02   30   mrem Iodine, Particulate &  Bone                         1.60E-01        Child         Cow Milk            5.33E-01   30   mrem Trtium Liquid         Total Body                   1.76E-02        Child         Aqua PA             2.93E-01    6   mrem Liquid         Liver                        1.77E-02        Child         Aqua PA             8.90E-02   20   mrem The calculated doses, as a result of the radiological effluents released from Limerick, were a very small percentage of the allowable limits.
This report on the Radiological Environmental Monitoring Program conducted for the Limerick Generating Station (LGS) by Exelon covers the period 1 January 2010 through 31 December 2010. During that time period, 1133 analyses were performed on 926 samples.
Surface and drinking water samples were analyzed for concentrations of tritium and gamma emitting nuclides. Drinking water samples were also analyzed for concentrations of total gross beta. No fission or activation products were detected. Gross beta activities detected were consistent with those detected in previous years.
Fish (predator and bottom feeder) and sediment samples were analyzed for concentrations of gamma emitting nuclides. No fission or activation products were detected in fish.
Sediment samples collected below the discharge had Cesium-1 37 concentrations that were consistent to those from previous years. No other station produced fission or activation products were found in sediment. The calculated dose to a teenager's skin and whole body was 4.36E-04 mrem and 3.74E-04 mrem, respectively. This dose represents 2.18E-03% and 6.23E-03%, respectively of the 10 CFR Part 50, Appendix I dose limits.
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Air particulate samples were analyzed for concentrations of gross beta and gamma emitting nuclides. Cosmogenic Be-7 was detected at levels consistent with those detected in previous years. No fission or activation products were detected.
High sensitivity 1-131 analyses were performed on weekly air samples. All results were less than the minimum detectable concentration.
Cow milk samples were analyzed for concentrations of 1-131 and gamma emitting nuclides. All 1-131 results were below the minimum detectable concentration. Concentrations of naturally occurring K-40 were consistent with those detected in previous years. No fission or activation products were found.
Broad leaf vegetation samples were analyzed for gamma emitting nuclides.
Concentrations of naturally occurring Be-7 and K-40 were detected. Radium-226 was found in eight of 33 samples. Thorium-228 and Th-232 were detected in low concentration just above the MDC (minimum detectable concentration). No activation or fission products were detected.
Environmental gamma radiation measurements were performed quarterly using thermoluminescent dosimeters (TLD). Levels detected were consistent with those observed in previous years.
Review of the gamma spectroscopy results from the surface water samples located at the Limerick intake (24S1) and downstream of the 10CFR20.2002 permitted storage area showed no evidence of offsite radionuclide transport from the 2002 permitted storage area.
A review of the TLD data for the nearest residence to the Independent Spent Fuel Storage Installation (ISFSI) indicates no direct dose was received.
A radiological groundwater protection program (RGPP) was established in 2006 as part of an Exelon Nuclear fleetwide assessment of potential groundwater intrusion from the operation of the Station. Well water samples were analyzed for tritium, Sr-90 and gamma emitters. Additionally, a select group of wells had hard-to-detect nuclides and gross alpha and gross beta analyses performed.
Most tritium values were less than the lower limit of detection of 200 pCi/L.
In assessing the data gathered for this report and comparing these results with preoperational data, it was concluded that the operation of LGS had no adverse radiological impact on the environment.
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II. Introduction The Limerick Generating Station (LGS), consisting of two 3,458 MWt boiling water reactors owned and operated by Exelon Corporation, is located adjacent to the Schuylkill River in Montgomery County, Pennsylvania. Unit No. 1 went critical on 22 December 1984. Unit No. 2 went critical on 11 August 1989. The site is located in Piedmont countryside, transversed by numerous valleys containing small tributaries that feed into the Schuylkill River. On the eastern river bank elevation rises from approximately 110 to 300 feet mean sea level (MSL). On the western river bank elevation rises to approximately 50 feet MSL to the western site boundary.
A Radiological Environmental Monitoring Program (REMP) for LGS was initiated in 1971. Review of the 1971 through 1977 REMP data resulted in the modification of the program to comply with changes in the Environmental Report Operating License Stage (EROL) and the Branch Technical Position Paper (Rev.
1, 1979). The preoperational period for most media covers the periods 1 January 1982 through 21 December 1984 and was summarized in a separate report.
This report covers those analyses performed by Teledyne Brown Engineering (TBE), Mirion Technologies (Dosimetry Services Division), and Environmental Inc. (Midwest Labs) on samples collected during the period 1 January 2010 through 31 December 2010.
On 6 July 1996 a 10CFR20.2002 permit was issued to Limerick for storage of slightly contaminated soils, sediments and sludges obtained from the holding pond, cooling tower and spray pond systems. These materials will decay to background while in storage. Final disposition will be determined at Station decommissioning.
On 21 July 2008 an ISFSI pad was put into service. The ISFSI is dry cask storage, where spent nuclear fuel is stored.
A.       Objective of the REMP The objectives of the REMP are to:
: 1. Provide data on measurable levels of radiation and radioactive materials in the site environs.
: 2. Evaluate the relationship between quantities of radioactive material released from the plant and resultant radiation doses to individuals from principal pathways of exposure.
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B. Implementation of the Objectives The implementation of the objectives is accomplished by:
: 1.      Identifying significant exposure pathways.
: 2.      Establishing baseline radiological data of media within those pathways.
: 3.      Continuously monitoring those media before and during station operation to assess station radiological effects (if any) on man and the environment.
II1. Program Description A. Sample Collection Samples for the LGS REMP were collected for Exelon Nuclear by Normandeau Associates, Inc. (NAI). This section describes the general collection methods used by NAI to obtain environmental samples for the LGS REMP in 2010. Sample locations and descriptions can be found in Tables B-1 and B-2, and Figures B-1 through B-3, Appendix B. The collection procedures used by NAI are listed in Table B-3.
Aquatic Environment The aquatic environment was evaluated by performing radiological analyses on samples of surface water, drinking water, fish, and sediment.
Two-gallon water samples were collected monthly from continuous samplers located at two surface water locations (1381 and 24S1) and four drinking water locations (15F4, 15F7, 16C2, and 28F3). Control locations were 24S1, and 28F3. All samples were collected in new unused plastic bottles, which were rinsed at least twice with source water prior to collection. Fish samples comprising of the flesh of two groups, catfish/bullhead (bottom feeder) and sunfish (predator), were collected semiannually at two locations, 16C5 and 29C1 (control). Sediment samples composed of recently deposited substrate were collected at three locations semiannually, 1682, 16C4 and 33A2 (control).
Atmospheric Environment The atmospheric environment was evaluated by performing radiological analyses on samples of air particulate, airborne iodine, and milk. Airborne iodine and particulate samples were collected and analyzed weekly at six locations (6C1, 10S3, 11S1, 13C1, 14S1, and 22G). The control location was 22G1. Airborne iodine and particulate samples were obtained at each location, using a vacuum pump with charcoal and glass fiber filters attached. The pumps were run continuously and sampled air at the rate of approximately one cubic foot per minute. The filters were replaced weekly 4

and sent to the laboratory for analysis.
Milk samples were collected biweekly at five locations (1 0F4, 18E1, 19B1, 23F1, and 25C1) from April through November, and monthly from December through March. One additional location (36E1) was sampled quarterly. Locations 36E1 and 23F1 were controls. All samples were collected in new unused two gallon plastic bottles from the bulk tank at each location, preserved with sodium bisulfite, and shipped promptly to the laboratory.
Broad leaf vegetation was collected monthly at three locations (11S3, 13S3 and 31G1). The control location was 31G1. Ten different kinds of vegetation samples were collected and placed in new unused plastic bags, and sent to the laboratory for analysis.
Ambient Gamma Radiation Direct radiation measurements were made using Panasonic 814 calcium sulfate (CaSO 4 ) thermoluminescent dosimeters (TLD). The TLD locations were placed on and around the LGS site as follows:
A site boundary rinq consisting of 16 locations (36S2, 3S1, 5S1, 7S1, 10S3, 11S1, 13S2, 14S1, 18S2, 21S2, 23S2, 25S2, 26S3, 29S1, 31S1 and 34S2) near and within the site perimeter representing fence post doses (i.e., at locations where the doses will be potentially greater than maximum annual off-site doses) from LGS releases.
An intermediate distance rinq consisting of 16 locations (36D1, 2E1, 4E1, 7E1, 1OE1, 10F3, 13E1, 16F1, 19D1, 20F1, 24D1, 25D1, 28D2, 29E1, 31D2, and 34E1) extending to approximately 5 miles from the site designed to measure possible exposures to close-in population.
The balance of eight locations (5H1, 6C1,9C1, 13C1, 15D1, 17B1, 20D1 and 31D1) representing control and special interests areas such as population centers, schools, etc.
The specific TLD locations were determined by the following criteria:
: 1.      The presence of relatively dense population;
: 2.      Site meteorological data taking into account distance and elevation for each of the sixteen-22 1/2 degree sectors around the site, where estimated annual dose from LGS, if any, would be most significant;
: 3.      On hills free from local obstructions and within sight of the vents (where practical);
: 4. And near the closest dwelling to the vents in the prevailing downwind direction.
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Two TLDs - each comprised of three CaSO 4 thermoluminescent phosphors enclosed in plastic - were placed at each location in a PVC conduit located approximately three feet above ground level. The TLDs were exchanged quarterly and sent to Mirion Technologies for analysis.
10CFR20.2002 Permit Storagqe Area The results of the surface water sampling program were used to determine if radioactive nuclide transport from the storage area into the Schuylkill River had occurred.
Independent Spent Fuel Storage Installation (ISFSl)
The results from the TLD location 36S2 were used to determine the direct radiation exposure to the nearest residence from the ISFSI pad.
B. Sample Analysis This section describes the general analytical methodologies used by TBE and Midwest Labs to analyze the environmental samples for radioactivity for the LGS REMP in 2010. The analytical procedures used by the laboratories are listed in Appendix B Table B-3.
In order to achieve the stated objectives, the current program includes the following analyses:
: 1. Concentrations of beta emitters in drinking water and air particulates.
: 2.      Concentrations of gamma emitters in surface and drinking water, air particulates, milk, fish, broad leaf vegetation and sediment.
: 3.      Concentrations of tritium in surface and drinking water.
: 4.      Concentrations of 1-131 in air and milk.
: 5.      Ambient gamma radiation levels at various site environs.
C. Data Interpretation The radiological and direct radiation data collected prior to LGS becoming operational was used as a baseline with which these operational data were compared. For the purpose of this report, LGS was considered operational at initial criticality. In addition, data were compared to previous years' operational data for consistency and trending. Several factors were important in the interpretation of the data:
: 1.      Lower Limit of Detection and Minimum Detectable Concentration The lower limit of detection (LLD) was defined as the smallest concentration of radioactive material in a sample that would yield a net count (above background) that would be detected with only a 6

5% probability of falsely concluding that a blank observation represents a "real" signal. The LLD was intended as a before the fact estimate of a system (including instrumentation, procedure and sample type) and not as an after the fact criteria for the presence of activity. All analyses were designed to achieve the required LGS detection limits for environmental sample analysis.
The minimum detectable concentration (MDC) was defined as above with the exception that the measurement is an after the fact estimate of the presence of activity.
: 2. Net Activity Calculation and Reporting of Results Net activity for a sample was calculated by subtracting background activity from the sample activity. Since the REMP measures extremely small changes in radioactivity in the environment, background variations may result in sample activity being lower than the background activity affecting a negative number. An MDC was reported in all cases where positive activity was not detected.
If no positive activity was detected, then gamma spectroscopy MDC results for each type of sample were grouped as follows:
For surface and drinking water twelve nuclides, Mn-54, Co-58, Fe-59, Co-60, Zn-65, Zr-95, Nb-95, 1-131, Cs-134, Cs-137, Ba-140, and La-140 were reported.
For broad leaf vegetation eleven nuclides, Be-7, K-40, Mn-54, Co-58, Co-60, 1-131, Cs-134, Cs-137, Ra-226, Th-228, and Th-232 were reported.
For fish nine nuclides, K-40, Mn-54, Co-58, Fe-59, Co-60, Zn-65, 1-131, Cs-134, and Cs-137 were reported.
For sediment eight nuclides, Be-7, K-40, Mn-54, Co-58, Co-60, 1-131, Cs-134, and Cs-137 were reported.
For air particulate six nuclides, Be-7, Mn-54, Co-58, Co-60, Cs-134, and Cs-137 were reported.
For milk five nuclides, K-40, Cs-1 34, Cs-1 37, Ba-140, and La-140 were reported.
Means and standard deviations of positive results were calculated.
The standard deviations represent the variability of measured results for different samples rather than single analysis uncertainty.
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D. Program Exceptions For 2010 the LGS REMP had a sample recovery rate in excess of 99%.
Exceptions are listed below:
: 1. Air sample from location 14S1 for the week 3/22/10 - 3/29/10 was not available due to equipment malfunction (IR 01087252 01).
: 2. TLD data from station 29E1 was not available for the 2nd quarter due to the station being vandalized (IR 01087252 04).
: 3. Only two vegetation samples were available at station 11S3 and 13S3 for the month of June (IR 01087252 02).
: 4. Only two vegetation samples were available at station 13S3 for the month of September (IR 01087252 05).
: 5. Weekly grab samples were taken for the composite surface water sampler at location 13B1 during the following periods due to equipment malfunction or frozen sample line (IR 01087252 06):
01/05/10   - 01/12/10 06/28/10   - 07/05/10 07/20/10   - 07/27/10 09/28/10   - 10/05/10 12/07/10   - 12/27/10
: 6. Grab samples were taken for the composite surface water sampler at location 24S1 during the following periods due to equipment malfunction (IR 01087252 06):
02/09/10 - 02/16/10 11/03/10 - 12/07/10
: 7. Weekly grab samples were taken for the composite drinking water sampler at location 16C2 during the following period due to equipment malfunction (IR 01087252 06):
12/28/09 - 01/19/10
: 8. A grab sample was taken for the composite drinking water sampler at location 28F3 during the week of 12/29/09 - 01/05/10 due to equipment malfunction (IR 01087252 06).
Each program exception was reviewed to understand the causes of the program exception. Sampling and maintenance errors were reviewed with the personnel involved to prevent recurrence. Occasional equipment breakdowns and power outages were unavoidable.
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The overall sample recovery rate indicates that the appropriate procedures and equipment are in place to assure reliable program implementation.
E. Program Changes
: 1. Air sampling station 6C1 was added to the REMP program on December 13, 2010 due to the increased population of the nearby shopping center (IR 1074042).
IV. Results and Discussion A. Aquatic Environment
: 1. Surface Water Samples were taken from a continuous sampler at two locations (13B1 and 24S1) on a monthly schedule. Of these locations only 13B1 located downstream, could be affected by Limerick's effluent releases. The following analyses were performed:
Tritium Monthly samples from all locations were composited quarterly and analyzed for tritium activity (Table C-1.1, Appendix C). All results were less than the MDC.
Gamma Spectrometry Samples from all locations were analyzed for gamma emitting nuclides (Table C-1.2, Appendix C). All nuclides were less than the MDC.
: 2. Drinking Water Monthly samples were collected from continuous water samplers at four locations (15F4, 15F7, 16C2, and 28F3). Three locations (15F4, 15F7, and 16C2) could be affected by Limerick's effluent releases. The following analyses were performed:
Gross Beta Samples from all locations were analyzed for concentrations of total gross beta (Tables C-I1.1, Appendix C). The values ranged from 2.5 to 6.7 pCi/L. Concentrations detected were consistent with those detected in previous years (Figure C-1, Appendix C).
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Tritium Monthly samples from all locations were composited quarterly and analyzed for tritium activity (Table C-11.2, Appendix C). All results were less than the MDC.
Gamma Spectrometry Samples from all locations were analyzed for gamma emitting nuclides (Table C-11.3, Appendix C). All nuclides were less than the MDC.
: 3. Fish Fish samples comprised of catfish/bullhead (bottom feeder) and sunfish (predator) were collected at two locations (16C5 and 29C1) in the spring and fall season. Location 16C5 could be affected by Limerick's effluent releases. The following analysis was performed:
Gamma Spectrometry The edible portion of fish samples from both locations was analyzed for gamma emitting nuclides (Table C-111.1, Appendix C).
Naturally occurring K-40 was found at all stations and ranged from 2,640 to 3,920 pCi/kg wet and was consistent with levels detected in previous years. No other gamma emitting nuclides were found.
Historical levels of Cs-1 37 are shown in Figure C-2, Appendix C.
: 4. Sediment Aquatic sediment samples were collected at three locations (16B2, 16C4 and 33A2) semiannually. Of these locations two, 16B2 and 16C4, located downstream, could be affected by Limerick's effluent releases. The following analysis was performed:
Gamma Spectrometry Sediment samples from all three locations were analyzed for gamma emitting nuclides (Table C-IV.l, Appendix C). Nuclides detected were naturally occurring Be-7, K-40 and the fission product Cs-137.
Beryllium-7 was found at locations 16B2 and 16C4 and ranged from 1,630 to 3,740 pCi/kg dry. Potassium-40 was found at all locations and ranged from 10,800 to 16,100 pCi/kg dry. The fission product Cs-137 was found at 16B2 and 16C4 locations and ranged from 164 to 166 pCi/kg dry. The Cs-137 activity found at 1682 and 10

16C4 is attributed to LGS radioactive effluent releases. The dose to a teenager's skin and whole body was conservatively calculated at 4.36E-04 mrem and 3.74E-04 mrem, respectively. This dose represents 2.18E-03% and 6.23E-03%, of the Appendix I to 10 CFR Part 50 dose limits, respectively. The activity detected was consistent with those detected in the pre-operational years.
(Figure C-4, Appendix C). No other Limerick fission or activation products were found.
B. Atmospheric Environment
: 1. Airborne
: a. Air Particulates Continuous air particulate samples were collected from six locations on a weekly basis. The six locations were separated into three groups: Group I represents locations within the LGS site boundary (10S3, 11S1, and 14S1),
Group II represents the locations at an intermediate distance from the LGS site (6C1 and 13C1), and Group III represents the control location at a remote distance from LGS (22G1).
The following analyses were performed:
Gross Beta Weekly samples were analyzed for concentrations of beta emitters (Table C-V.1 and C-V.2, Appendix C).
Detectable gross beta activity was observed at all locations.
The results from the on-site locations (Group I) ranged from 6 E-3 to 35 E-3 pCi/m 3 with a mean of 16.5 E-3 pCi/m 3 .
The results from the intermediate distance location (Group II) ranged from 6 E-3 to 31 E-3 pCi/m 3 with a mean of 16 E-3 pCi/m 3 . The results from the Distant locations (Group Ill) ranged from 7 E-3 to 32 E-3 pCi/m 3 with a mean of 16 E-3 pCi/m 3 . Comparison of the 2010 air particulate data with previous year's data indicate no effects from the operation of LGS (Figure C-4, Appendix C). In addition, a comparison of the weekly mean values for 2010 indicate no notable differences among the three groups (Figure C-5, Appendix C).
Gamma Spectrometry Weekly samples were composited quarterly and analyzed for gamma emitting nuclides (Table C-V.3, Appendix C).
Naturally occurring Be-7 due to cosmic ray activity was 11

detected in all samples. These values ranged from 47 E-3 to 135 E-3 pCi/m 3 . All other nuclides were less than the MDC.
: b. Airborne Iodine Continuous air samples were collected from six locations (6C1, 10S3, 11S1, 14S1, 13C1, and 22G1) and analyzed weekly for 1-131 (Table C-VI.1, Appendix C). All results were less than the MDC.
: 2. Terrestrial
: a. Milk Samples were collected from five locations (10F4, 18E1, 119B1, 23F1, and 25C1) biweekly April through November and monthly December through March. Samples from one additional location (36E1) were taken quarterly. The following analyses were performed:
Iodine-131 Milk samples from all locations were analyzed for concentrations of 1-131 (Table C-VII.1, Appendix C). All results were less than the MDC.
Gamma Spectrometry Each milk sample was analyzed for concentrations of gamma emitting nuclides (Table C-VII.2, Appendix C).
Naturally occurring K-40 activity was found in all samples and ranged from 1,050 to 1,500 pCi/L. All other nuclides were less than the MDC.
: b. Broad Leaf Vegetation Three types of broad leaf vegetation samples were collected from three locations (11S3, 13S3 and 31 G1) monthly from June through September. The following analysis was performed:
Gamma Spectrometry Each broad leaf vegetation sample was analyzed for concentrations of gamma emitting nuclides (Table C-VIII.1, Appendix C).
12

Cosmogenic Be-7 was found in 17 of 33 samples and ranged from 124 to 2,150 pCi/kg wet. Naturally occurring K-40 was found in all samples and ranged from 3,420 to 9,930 pCi/kg wet. All other nuclides were less than the MDC.
C. Ambient Gamma Radiation Ambient gamma radiation levels were measured utilizing Panasonic 814 (CaSO4 ) thermoluminescent dosimeters. Forty TLD locations were established around the site. Results of TLD measurements are listed in Tables C-IX.1 to C-IX.3, Appendix C.
All TLD measurements were below 10 mR/standard month, with a range of 4.9 to 9.8 mR/standard month. A comparison of the Site Boundary and Intermediate Distance data to the Control Location data, indicate that the ambient gamma radiation levels from the Control Location 5H1 were consistently higher than all other locations except 13S2. Location 13S2 historically shows higher ambient gamma radiation, which is assumed due to the rock substrate. The area that this TLD is located in has been determined to emanate radon prodingy.
The historical ambient gamma radiation data from Location 5H1 were plotted along with similar data from the Site, Intermediate Distance and Outer Ring Locations (Figure C-6, Appendix C). Location 5H1 has a historical high bias, but tracked with the data from all three groups. This bias is most likely due to radon emanating from the ground.
D. 10 CFR 20.2002 Permit Storage Area The results of the surface water aquatic monitoring program from Location 24S1 were used to determine if radioactivity from the permit storage area had made it to the Schuylkill River. The data obtained from the gamma analysis program did not detect any migration of radioactivity from the permit storage area.
E. Independent Spent Fuel Storage Installation The result of the ambient gamma radiation level at TLD location 36S2 was used to determine the direct radiation exposure to the nearest residence from the ISFSI pad. The data, after subtracting background, shows the net direct radiation exposure to the nearest residence was zero mrem.
F. Land Use Survey A Land Use Survey conducted in September 2010 around Limerick Generating Station (LGS) was performed by Normandeau Associates, Inc.
for Exelon Nuclear to comply with Bases 3.3.2 of the Limerick's Offsite Dose Calculation Manual. The purpose of the survey was to document 13

the nearest resident, milk producing animal and garden of greater than 500 ft2 in each of the sixteen 22 1/2 degree sectors around the site. The gardens in the N, ENE, E, and SW sectors are closer than in 2009. The distance and direction of all locations from the LGS reactor buildings were positioned using Global Positioning System (GPS) technology. There were no changes required to the LGS REMP, as a result of this survey.
The results of this survey are summarized below.
Distance in miles from the LGS Reactor Buildings Sector            Residence                Garden             Milk Farm Feet                    Feet                Feet 1N                 3,109                  3,775              24,775 2 NNE              2,706                  9,610 3 NE               3,469                  17,769 4 ENE               3,231                  14,206 5 E                2,864                  6,950 6 ESE              3,434                  1,822 7 SE               5,108                  1,282 8 SSE              5,403                  6,898 9S                 4,347                  6,103              22,115 10 SSW               5,063                  5,320              10,390 11 SW                3,251                  4,559 12 WSW               3,799                  12,013             14,175 13 W                 3,627                  4,208              14,654 14 WNW               3,932                  3,932 15 NW                3,619                  8,169 16 NNW               5,051                  7,107 G. Summary of Results - Inter-laboratory Comparison Program The primary and secondary laboratories analyzed Performance Evaluation (PE) samples of air particulate, air iodine, milk, soil, vegetation and water matrices for 18 and 14 analytes, respectively (Appendix E). The PE samples, supplied by Analytics Inc., Environmental Resource Associates (ERA) and DOE's MAPEP, were evaluated against the following pre-set acceptance criteria:
: 1.      Analytics Evaluation Criteria Analytics' evaluation report provides a ratio of TBE's result and Analytics' known value. Since flag values are not assigned by Analytics, TBE-ES evaluates the reported ratios based on internal QC requirements, which are based on the DOE MAPEP criteria.
: 2.      ERA Evaluation Criteria ERA's evaluation report provides an acceptance range for control and warning limits with associated flag values. ERA's acceptance limits are established per the USEPA, NELAC, state specific PT program requirements or ERA's SOP for the Generation of Performance Acceptance Limits, as applicable. The acceptance 14

limits are either determined by a regression equation specific to each analyte or a fixed percentage limit promulgated under the appropriate regulatory document.
: 3.       DOE Evaluation Criteria MAPEP's evaluation report provides an acceptance range with associated flag values.
The MAPEP defines three levels of performance: Acceptable (flag =
                  "A"), Acceptable with Warning (flag = "W"), and Not Acceptable (flag = "N"). Performance is considered acceptable when a mean result for the specified analyte is +/- 20% of the reference value.
Performance is acceptable with warning when a mean result falls in the range from +/- 20% to +/- 30% of the reference value (i.e., 20% <
bias < 30%). If the bias is greater than 30%, the results are deemed not acceptable.
For the primary laboratory, 16 out of 18 analytes met the specified acceptance criteria. Two analytes did not meet the specified acceptance criteria for the following reason:
: 1. Teledyne Brown Engineering's ERA November 2010 Sr-89 in water result of 77.8 pCi/L was higher than the known value of 68.5 pCi/L, resulting in a found to known ratio of 1.14. NCR 10-09 was initiated to investigate this failure. Since the ratio of 1.14 fell within an acceptance range of 20%, Teledyne considers this an acceptable result.
: 2. Teledyne Brown Engineering's ERA November 2010 Zn-65 in water result of 11.0 pCi/L was lower than the known value of 102 pCi/L.
NCR 10-09 was initiated to investigate this failure. The Zn-65 result of 111 was incorrectly reported as 11.0.
For the secondary laboratory, Environmental, Inc., all analytes met the specified acceptance criteria.
The Inter-Laboratory Comparison Program provides evidence of "in control" counting systems and methods, and that the laboratories are producing accurate and reliable data.
V. References
: 1. Environmental Report Operating License Stage, Limerick Generating Station, Units 1 and 2, Volumes 1-5 Philadelphia Electric Company.
15
: 2. Branch Technical Position Paper, Regulatory Guide 4.8, Revision 1, November 1979.
: 3. Pre-operational Radiological Environmental Monitoring Program Report, Limerick Generating Station Units 1 and 2, 1 January 1982 through 21 December 1984, Teledyne Isotopes and Radiation Management Corporation.
16

APPENDIX A RADIOLOGICAL ENVIRONMENTAL MONITORING REPORT 

==SUMMARY==

TABLE A-1 RADIOLOGICAL ENVIRONMENTAL MONITORING PROGRAM ANNUAL 

==SUMMARY==
FOR THE LIMERICK GENERATING STATION, 2010 Name of Facility: LIMERICK GENERATING STATION                     DOCKET NUMBER:       50-352 & 50-353 Location of Facility: MONTGOMERY COUNTY PA                 REPORTING PERIOD:   2010 INDICATOR CONTROL   LOCATION WITH HIGHEST ANNUAL MEAN (M)
LOCATIONS LOCATION MEDIUM OR                   TYPES OF     NUMBER OF    REQUIRED   MEAN(M)   MEAN (M)  MEAN(M)    STATION #                NUMBER OF PATHWAY SAMPLED             ANALYSIS      ANALYSIS   LOWER LIMIT (F)       (F)       (F)        NAME                    NONROUTINE (UNIT OF                    PERFORMED    PERFORMED OF DETECTION RANGE      RANGE     RANGE      DISTANCE AND DIRECTION   REPORTED MEASUREMENT)                                            (LLD)                                                          MEASUREME NTS SURFACE WATER               H-3               8          200     <LLD      <LLD                                              0 (PCI/LITER)
SURFACE WATER               GAMMA            24 (PCI/LITER)                 MN-54                         15     <LLD      <LLD                                              0 CO-58                         15     <LLD      <LLD                                              0 FE-59                         30     <LLD      <LLD                                              0 CO-60                         15     <LLD      <LLD                                              0 ZN-65                         30     <LLD      <LLD                                              0 NB-95                         15     <LLD      <LLD                                              0 ZR-95                         30     <LLD      <LLD                                              0 1-131                         15     <LLD      <LLD                                              0 CS-134                        15     <LLD      <LLD                                              0 A-1

TABLE A-1 RADIOLOGICAL ENVIRONMENTAL MONITORING PROGRAM ANNUAL 

==SUMMARY==
FOR THE LIMERICK GENERATING STATION, 2010 Name of Facility: LIMERICK GENERATING STATION                       DOCKET NUMBER:       50-352 & 50-353 Location of Facility: MONTGOMERY COUNTY PA                 REPORTING PERIOD:     2010 INDICATOR CONTROL     LOCATION WITH HIGHEST ANNUAL MEAN (M)
LOCATIONS LOCATION MEDIUM OR                   TYPES OF     NUMBER OF    REQUIRED   MEAN (M)    MEAN (M)  MEAN (M)   STATION #                  NUMBER OF PATHWAY SAMPLED             ANALYSIS      ANALYSIS   LOWER LIMIT (F)         (F)       (F)        NAME                      NONROUTINE (UNIT OF                    PERFORMED    PERFORMED OF DETECTION RANGE        RANGE     RANGE      DISTANCE AND DIRECTION     REPORTED MEASUREMENT)                                            (LLD)                                                              MEASUREMENTS DRINKING WATER              GR-B             48            4     4.4         3.8       5.2        15F4 INDICATOR                 0 (PCI/LITER)                                                      (26/36)     (10/12)   (9/12)     PHILADELPHIA SUBURBAN WATER COMPANY (2.5/6.7)   (3.2/5.3) (3.7/6.7)  45514 FEET SE OF SITE H-3              16          200     <LLD        <LLD                                                0 DRINKING WATER              GAMMA            48 (PCI/LITER)                 MN-54                         15     <LLD        <LLD                                                0 CO-58                         15     <LLD        <LLD                                                0 FE-59                         30     <LLD        <LLD                                                0 CO-60                         15     <LLD        <LLD                                                0 ZN-65                         30     <LLD        <LLD NB-95                         15     <LLD        <LLD ZR-95                         30     <LLD        <LLD 1-131                         15     <LLD        <LLD                                                0 CS-134                        15     <LLD        <LLD                                                0 A-2

TABLEA-1 RADIOLOGICAL ENVIRONMENTAL MONITORING PROGRAM ANNUAL 

==SUMMARY==
FOR THE LIMERICK GENERATING STATION, 2010 Name of Facility: LIMERICK GENERATING STATION                        DOCKET NUMBER:          50-352 & 50-353 Location of Facility: MONTGOMERY COUNTY PA                  REPORTING PERIOD:       2010 INDICATOR CONTROL       LOCATION WITH HIGHEST ANNUAL MEAN (M)
LOCATIONS LOCATION MEDIUM OR                   TYPES OF     NUMBER OF     REQUIRED   MEAN (M)    MEAN (M)    MEAN (M)    STATION #                 NUMBER OF PATHWAY SAMPLED             ANALYSIS      ANALYSIS    LOWER LIMIT (F)         (F)         (F)         NAME                     NONROUTINE (UNIT OF                    PERFORMED    PERFORMED   OF DETECTION RANGE       RANGE       RANGE       DISTANCE AND DIRECTION    REPORTED MEASUREMENT)                                             (LLD)                                                                MEASUREME NTS BOTTOM FEEDER               GAMMA             4 (PCI/KG WET)                K-40                          NA      3780        3270        3780        16C5 INDICATOR                0 (2/2)       (2/2)       (2/2)       VINCENT POOL (3640/3920) (3260/3280) (3640/3920) DOWNSTREAM OF DISCHARGE M N-54                        130     <LLD        <LLD                                                  0 CO-58                         130     <LLD        <LLD                                                  0 FE-59                         260     <LLD        <LLD                                                  0 CO-60                         130     <LLD        <LLD                                                  0 ZN-65                         260     <LLD        <LLD                                                  0 1-131                         NA      <LLD        <LLD                                                  0 CS-134                        130     <LLD        <LLD                                                  0 CS-137                        150     <LLD        <LLD                                                  0 A-3

TABLE A-1 RADIOLOGICAL ENVIRONMENTAL MONITORING PROGRAM ANNUAL 

==SUMMARY==
FOR THE LIMERICK GENERATING STATION, 2010 Name of Facility: LIMERICK GENERATING STATION                       DOCKET NUMBER:          50-352 & 50-353 Location of Facility: MONTGOMERY COUNTY PA                 REPORTING PERIOD:       2010 INDICATOR CONTROL       LOCATION WITH HIGHEST ANNUAL MEAN (M)
LOCATIONS LOCATION MEDIUM OR                   TYPES OF     NUMBER OF    REQUIRED   MEAN (M)    MEAN (M)    MEAN (M)    STATION #                NUMBER OF PATHWAY SAMPLED             ANALYSIS      ANALYSIS   LOWER LIMIT (F)         (F)         (F)         NAME                    NONROUTINE (UNIT OF                    PERFORMED    PERFORMED OF DETECTION RANGE        RANGE       RANGE       DISTANCE AND DIRECTION   REPORTED MEASUREMENT)                                            (LLD)                                                               MEASUREMENTS PREDATOR                    GAMMA             4 (PCI/KG WET)                K-40                         NA      3075        3210        3210        29C1 CONTROL                 0 (2/2)       (2/2)       (2/2)       POTTSTOWN VIC INITY (2640/3510) (3110/3310) (3110/3310) UPSTREAM OF INTAKE MN-54                        130     <LLD        <LLD                                                 0 CO-58                        130     <LLD        <LLD                                                 0 FE-59                        260     <LLD        <LLD                                                 0 CO-60                        130     <LLD        <LLD                                                 0 ZN-65                        260     <LLD        <LLD                                                 0 1-131                        NA      <LLD        <LLD                                                 0 CS-134                       130     <LLD        <LLD                                                 0 A-4

TABLE A-1 RADIOLOGICAL ENVIRONMENTAL MONITORING PROGRAM ANNUAL 

==SUMMARY==
FOR THE LIMERICK GENERATING STATION, 2010 Name of Facility: LIMERICK GENERATING STATION                         DOCKET NUMBER:              50-352 & 50-353 Location of Facility: MONTGOMERY COUNTY PA                 REPORTING PERIOD:           2010 INDICATOR CONTROL           LOCATION WITH HIGHEST ANNUAL MEAN (M)
LOCATIONS LOCATION MEDIUM OR                   TYPES OF     NUMBER OF    REQUIRED   MEAN (M)      MEAN (M)      MEAN (M)      STATION #                NUMBER OF PATHWAY SAMPLED             ANALYSIS      ANALYSIS   LOWER LIMIT (F)           (F)           (F)           NAME                    NONROUTINE (UNIT OF                    PERFORMED    PERFORMED OF DETECTION RANGE          RANGE         RANGE         DISTANCE AND DIRECTION   REPORTED MEASUREMENT)                                            (LLD)                                                                     MEASUREMENTS SEDIMENT                    GAMMA             6 (PCI/KG DRY)                BE-7                          NA     2685          <LLD          3740          16B2 INDICATOR               0 (2/4)                       (1/2)         LINFIELD BRIDGE (1630/3740)                               7128 FEET SSE OF SITE K-40                          NA     14225         13350         15700         16B2 INDICATOR               0 (4/4)         (2/2)         (2/2)         LINFIELD BRIDGE (10800/16100) (13000/13700) (15300/16100) 7128 FEET SSE OF SITE MN-54                         NA     <LLD          <LLD                                                     0 CO-58                         NA     <LLD          <LLD                                                     0 CO-60                         NA     <LLD          <LLD                                                     0 1-131                         NA     <LLD          <LLD                                                     0 CS-134                       150     <LLD          <LLD                                                     0 CS-137                       180     165           <LLD          166           16C4 INDICATOR               0 (2/4)                       (1/2)         VINCENT DAM (164/166)                                 11510 FEET SSE OF SITE A-5

TABLE A-1  RADIOLOGICAL ENVIRONMENTAL MONITORING PROGRAM ANNUAL 

==SUMMARY==
FOR THE LIMERICK GENERATING STATION, 2010 Name of Facility: LIMERICK GENERATING STATION                        DOCKET NUMBER:          50-352 & 50-353 Location of Facility: MONTGOMERY COUNTY PA                   REPORTING    PERIOD:    2010 INDICATOR   CONTROL     LOCATION WITH HIGHEST ANNUAL MEAN (M)
LOCATIONS   LOCATION MEDIUM OR                   TYPES OF      NUMBER OF     REQUIRED   MEAN (M)    MEAN (M)    MEAN (M)    STATION #                NUMBER OF PATHWAY SAMPLED             ANALYSIS       ANALYSIS    LOWER LIMIT (F)         (F)         (F)         NAME                    NONROUTINE (UNIT OF                    PERFORMED     PERFORMED   OF DETECTION RANGE       RANGE       RANGE       DISTANCE AND DIRECTION   REPORTED MEASUREMENT)                                              (LLD)                                                               MEASUREMENTS AIR PARTICULATE             GR-B              267           10     16          16          17          10S3 INDICATOR               0 (E-3 PCI/CU.METER)                                                 (207/214)   (52/53)     (51/53)     KEEN ROAD (6/35)      (7/32)      (8/34)      2640 FEET E OF SITE GAMMA             21 BE-7                           NA      87          88          135         6C1 INDICATOR                0 (17117)     (4/4)       (1/1)
(47/135)    (79/103)                11305 FEET NE OF SITE MN-54                           NA     <LLD        <LLD                                                 0 CO-58                           NA     <LLD        <LLD                                                 0 CO-60                           NA     <LLD        <LLD                                                 0 CS-134                          50     <LLD        <LLD                                                 0 CS-1 37                         60     <LLD        <LLD                                                 0 AIR IODINE                  GAMMA             267 (E-3 PCI/CU.METER)          1-131                           70     <LLD        <LLD                                                 0 MILK                        1-131             114                  <LLD        <LLD                                                 0 (PCI/LITER)
GAMMA             114 K-40                            NA     1283        1290        1310        23F1 CONTROL                 0 (88/88)     (26/26)     (22/22)
(1050/1500) (1140/1410) (1140/1410) 26506 FEET SW OF SITE CS-134                          15     <LLD        <LLD                                                 0 CS-137                          18     <LLD        <LLD                                                 0 BA-140                          60     <LLD        <LLD                                                 0 LA-140                          15     <LLD        <LLD                                                 0 A-6

TABLEA-1    RADIOLOGICAL ENVIRONMENTAL MONITORING PROGRAM ANNUAL 

==SUMMARY==
FOR THE LIMERICK GENERATING STATION, 2010 Name of Facility: LIMERICK GENERATING STATION                          DOCKET NUMBER:          50-352& 50-353 Location of Facility: MONTGOMERY COUNTY PA                     REPORTING PERIOD:      2010 INDICATOR CONTROL       LOCATION WITH HIGHEST ANNUAL MEAN (M)
LOCATIONS LOCATION MEDIUM OR                    TYPES OF       NUMBER OF     REQUIRED   MEAN(M)     MEAN (M)    MEAN(M)     STATION #               NUMBER OF PATHWAY SAMPLED              ANALYSIS        ANALYSIS    LOWER LIMIT (F)         (F)         (F)         NAME                    NONROUTINE (UNIT OF                     PERFORMED      PERFORMED   OF DETECTION RANGE       RANGE       RANGE       DISTANCE AND DIRECTION   REPORTED MEASUREMENT)                                                (LLD)                                                               MEASUREMENTS VEGETATION                   GAMMA               33 (PCI/KG WET)                 BE-7                            NA      298         1334        1334        31G1 CONTROL (9/21)      (8/12)      (8/12)      PROUT'S JOLLYVIEW FARM (124/564)   (85/2150)   (85/2150)   71808 FEET NW OF SITE K-40                            NA      4799        5330        5330        31G1 CONTROL (21/21)     (12/12)     (12/12)     PROUT'S JOLLYVIEW FARM (3420/8510) (3490/9660) (3490/9660) 71808 FEET NW OF SITE MN-54                           NA      <LLD        <LLD                                                 0 CO-58                           NA      <LLD        <LLD CO-60                           NA      <LLD        <LLD                                                 0 1-131                            60     <LLD        <LLD                                                 0 CS-134                           60     <LLD        <LLD CS-137                           80     <LLD        <LLD                                                 0 RA-226                          NA      2707        2080        2707        13S3 INDICATOR               0 (7/2 1)     (1/12)      (7/10)      LGS 500 KV YARD (1380/4140)             (1380/4140) 1267 FEET SE OF SITE TH-228                          NA      62          48          71          11S3 INDICATOR (4/21)      (2/12)      (1/11)      LGS INFORMATION CENTER (20/99)     (30/68)                 1848 FEET ESE OF SITE TH-232                          NA      45          35          45          13S3 INDICATOR               0 (1/21)      (3/12)      (1/10)      LGS 500 KV YARD (35/36)                 1267 FEET SE OF SITE DIRECT RADIATION             TLD-QUARTERLY      159          NA      6.8         8.4         9.3         13S2 INDICATOR               0 (M ILLI-ROENTGEN/STD.MO.)                                            (155/155)   (4/4)       (4/4)       LGS 500 KV YARD (4.9/9.8)   (7.8/9.1)   (8.8/9.8)   2149 FEET SE OF SITE A-7

Intentionally Left Blank A-8

APPENDIX B LOCATION DESIGNATION, DISTANCE &
DIRECTION, AND SAMPLE COLLECTION &
ANALYTICAL. METHODS

TABLE B-1: Location Designation and Identification System for the Limerick Generating Station XXYZ -     General code for identification of locations, where:
xx   -     Angular Sector of Sampling Location. The compass is divided into 36 sectors of 10 degrees each with center at Limerick's Units 1 and 2 off-gas vents. Sector 36 is centered due North, and others are numbered in a clockwise direction.
Y    -     Radial Zone of Sampling Location (in this report, the radial distance from the Limerick vent for all regional stations).
S    on-site location                   E    21,120-26,400 feet off-site A    0-5,280 feet off-site              F:   26,400-52,800 feet off-site B    5,280-10,560 feet off-site         G:  52,800-105,600 feet off-site C     10,560-15,840 feet off-site       H:  105,600-528,000 feet off-site D     15,840-21,120 feet off-site Z    -     Station's Numerical Designation within sector and zone, using 1, 2, 3... in each sector and zone.
B-1

TABLE B-2:         Radiological Environmental Monitoring Program - Sampling Locations, Distance and Direction, Limerick Generating Station, 2010 Location           Location Description                                        Distance & Direction From Site A.       Surface Water 13B1               Vincent Dam                                                 9,225 feet SE 24S1               Limerick Intake (control)                                   1,058 feet SW B.       Drinking (Potable) Water 15F4               Philadelphia Suburban Water Company                         45,514  feet SE 15F7               Phoenixville Water Works                                    33,400  feet SSE 16C2               Citizens Home Water Company                                 14,034  feet SSE 28F3               Pottstown Water Authority (control)                         30,811  feet WNW C.       Milk - bi-weekly / monthly 10F4                                                                           34,848  feet ESE 18E1                                                                           22,229   feet S 19B1                                                                           10,317  feet SSW 23F1               Control                                                     26,505  feet SW 25C1                                                                           14,224  feet WSW D.       Milk - quarterly 36E1               Control                                                     24,816 feet N E.       Air Particulates / Air Iodine 10S3               Keen Road                                                   2,648 feet E 11S1               LGS Information Center                                      2,017 feet ESE 11S2               LGS Information Center (quality control)                    2,006 feet ESE 13C1               King Road                                                   14,980 feet SE 14S1               Longview Road                                               3,319 feet SSE 22G1               Manor Substation (control)                                  93,619 feet SW 6C1                Pottstown Landing Field                                     11,305 feet NE F.Fish 16C5               Vincent Pool                                                Downstream of Discharge 29C1               Pottstown Vicinity (control)                                Upstream of Intake G.       Sediment 16B2               Linfield Bridge                                             7,128 feet SSE 16C4               Vincent Dam                                                 11,510 feet SSE 33A2               Upstream of Intake (control)                                4,435 feet NNW H.       Broad Leaf Vegetation 11S3               LGS Information Center                                      1,848 feet ESE 13S3               LGS 500 KV Yard                                             1,267 feet SE 31G1               Prout's Jollyview Farm (control)                            71,808 feet NW B-2

TABLE B-2:          Radiological Environmental Monitoring Program - Sampling Locations, Distance and Direction, Limerick Generating Station, 2010 Location            Location Description                                        Distance & Direction From Site H.         Environmental Dosimetrv - TLD Site Boundary 36S2                Evergreen & Sanatoga Road                                   3,183 feet N 3S1                 Sanatoga Road                                               2,301 feet NNE 5S1                 Possum Hollow Road                                          2,350 feet NE 7S1                 LGS Training Center                                         3,099 feet ENE 10S3                Keen Road                                                   2,648 feet E 11S1                LGS Information Center                                      2,017 feet ESE 13S2                500 KV Substation                                           2,149 feet SE 14S1                Longview Road                                               3,319 feet SSE 18S2                Rail Line along Longview Road                               1,390 feet S 21S2                Near Intake Building                                        977 feet SSW 23S2                Transmission Tower                                          2,793 feet SW 25S2                Sector Site Boundary                                        2,445 feet WSW 26S3                Met. Tower #2                                               2,088 feet W 29S1                Sector Site Boundary                                        2,886 feet WNW 31S1                Sector Site Boundary                                        1,395 feet NW 34S2                Met. Tower #1                                               3,071 feet NNW Intermediate Distance 36D1              Siren Tower No. 147                                           18,527  feet N 2E1               Laughing Waters GSC                                           25,112  feet NNE 4E1               Neiffer Road                                                  25,221  feet NE 7E1               Pheasant Road                                                 22,489  feet ENE 1OE1              Royersford Road                                               20,826  feet E 10F3              Trappe Substation                                             29,442  feet ESE 13E1              Vaughn Substation                                             22,772  feet SE 16F1              Pikeland Substation                                           26,608  feet SSE 119D1             Snowden Substation                                            18,439  feet S 20F1              Sheeder Substation                                            27,648  feet SSW 24D1              Porters Mill Substation                                       20,972  feet SW 25D1              Hoffecker & Keim Streets                                      21,044  feet WSW 28D2              W. Cedarville Road                                            20,231  feet W 29E1              Prince Street                                                 26,110  feet WNW 31 D2             Poplar Substation                                             20,446  feet NW 34E1              Varnell Road                                                  24,243  feet NNW Control and Special Interest 5H1               Birch Substation (control)                                    130,742 feet NE 6C1               Pottstown Landing Field                                       11,305 feet NE 9Cl               Reed Road                                                     11,377 feet E 13C1              King Road                                                     14,980 feet SE 15D1              Spring City Substation                                        16,877 feet SE 17B1              Linfield Substation                                           8,462 feet S 20D1              Ellis Woods Road                                              16,157 feet SSW 31D1              Lincoln Substation                                            15,853 feet WNW B-3

TABLE B-3:        Radiological Environmental Monitoring Program - Summary of Sample Collection and Analytical Methods, Limerick Generating Station, 2010 Sample              Analysis        Sampling Method                 Collection Procedure Number                 Sample Size                      Analytical Procedure Number Medium Surface Water    Gamma Spectroscopy   Monthly composite from     RMC-ER5 Collection of water samples for       2 gallon                TBE, TBE-2007 Gamma emitting radioisotope analysis a continuous water         radiological analysis (Limerick Generating compositor.                Station)                                                              Env. Inc., GS-01 Determination of gamma emitters by gamma spectroscopy Surface Water    Tritium              Quarterly composite        RMC-ER5 Collection of water samples for       500 ml                  TBE, TBE-2011 Tritium analysis in drinking water by liquid from a continuous water    radiological analysis (Limerick Generating                            scintillation compositor.                Station)
Env. Inc., T-02 Determination of tritium in water (direct method)
Drinking Water   Gross Beta           Monthly composite from     RMC-ER5 Collection of water samples for       2 gallon                TBE, TBE-2008 Gross Alpha and/or gross beta activity in a continuous water         radiological analysis (Limerick Generating                            various matrices compositor.                Station)
Env. Inc., W(DS)-01 Determination of gross alpha and/or gross beta in water (dissolved solids or total residue)
Env. Inc., W(SS)-02 Determination of gross alpha and/or gross beta in water (suspended solids)
Drinking Water   Gamma Spectroscopy   Monthly composite from     RMC-ER5 Collection of water samples for       2 gallon                TBE, TBE-2007 Gamma emitting radioisotope analysis a continuous water         radiological analysis (Limerick Generating compositor.                Station)                                                              Env. Inc., GS-01 Determination of gamma emitters by gamma spectroscopy Drinking Water   Tritium              Quarterly composite        RMC-ER5 Collection of water samples for       500 ml                  TBE, TBE-2011 Tritium analysis in drinking water by liquid from a continuous water    radiological analysis (Limerick Generating                            scintillation compositor.                Station)
Env. Inc., T-02 Determination of tritium in water (direct method)
Fish             Gamma Spectroscopy   Semi-annual samples        RMC-ER6 Collection of fish samples for        1000 grams (wet)        TBE, TBE-2007 Gamma emitting radioisotope analysis collected via              radiological analysis (Limerick Generating electroshocking or other   Station)                                                              Env. Inc., GS-01 Determination of gamma emitters by approved techniques                                                                              gamma spectroscopy Sediment         Gamma Spectroscopy   Semi-annual grab           RMC-ER7 Collection of sediment samples for    500 grams (dry)         TBE, TBE-2007 Gamma emitting radioisotope analysis samples                    radiological analysis (Limerick Generating Station)                                                              Env. Inc., GS-01 Determination of gamma emitters by gamma spectroscopy Air Particulates Gross Beta           One-week composite of      RMC-ER8 Collection of air particulate and air 1 filter (approximately TBE, TBE-2008 Gross Alpha and/or gross beta activity in continuous air sampling    iodine samples for radiological analysis      280 cubic meters        various matrices through glass fiber filter (Limerick Generating Station)                 weekly) paper                                                                                            Env. Inc., AP-02 Determination of gross alpha and/or gross beta in air particulate filters B-4

TABLE B-3:        Radiological Environmental Monitoring Program - Summary of Sample Collection and Analytical Methods, Limerick Generating Station, 2010 Sample            Analysis         Sampling Method              Collection Procedure Number                   Sample Size                     Analytical Procedure Number Medium Air Particulates Gamma Spectroscopy   Quarterly composite of  TBE, TBE-2023 Compositing of samples           13 filters              TBE, TBE-2007 Gamma emitting radioisotope analysis each station                                                           (approximately 3600 Env. Inc., AP-03 Procedure for compositing air cubic meters)           Env. Inc., GS-01 Determination of gamma emitters by particulate filters for gamma spectroscopic                            gamma spectroscopy analysis Air Iodine       Gamma Spectroscopy   One-week composite of   RMC-ER8 Collection of air particulate and air  1 filter (approximately TBE, TBE-2007 Gamma emitting radioisotope analysis continuous air sampling iodine samples for radiological analysis       280 cubic meters through charcoal filter (Limerick Generating Station)                  weekly)                 Env. Inc., 1-131-02 Determination of 1-131 in charcoal canisters by gamma spectroscopy (batch method)
Milk             1-131                Bi-weekly grab sample   RMC-ER10 Collection of milk samples for        2 gallon                TBE, TBE-2012 Radioiodine in various matrices when cows are on        radiological analysis (Limerick Generating pasture. Monthly all    Station)                                                               Env. Inc., 1-131-01 Determination of 1-131 in milk by anion other times                                                                                    exchange Milk             Gamma Spectroscopy   Bi-weekly grab sample   RMC-ER1 0 Collection of milk samples for       2 gallon                TBE, TBE-2007 Gamma emitting radioisotope analysis when cows are on        radiological analysis (Limerick Generating pasture. Monthly all    Station)                                                               Env. Inc., GS-01 Determination of gamma emitters by other times                                                                                    gamma spectroscopy TLD              Thermoluminescence   Quarterly TLDs          RMC-ER9 Collection of TLD samples for          2 dosimeters            Mirion Technologies Dosimetry            comprised of two        radiological analysis (Limerick Generating Panasonic 814           Station)
(containing 3 each CaSO4 elements)
B-5

i
                                                                         ,SE Figure B-1 Environmental Sampling Locations Within 5,280 Feet of the Limerick Generating Station, 2010 B-6

Figure B-2 Environmental Sampling Locations Between 5,280 and 26,400 Feet from the Limerick Generating Station, 2010 B-7

Figure B-3 Environmental Sampling Locations Greater than 26,400 Feet from the Limerick Generating Station, 2010 B-8

APPENDIX C DATA TABLES AND FIGURES PRIMARY LABORATORY

TABLE C-I.1 CONCENTRATIONS OF TRITIUM IN SURFACE WATER SAMPLES COLLECTED IN THE VICINITY OF LIMERICK GENERATING STATION, 2010 RESULTS IN UNITS OF PCI/LITER +/- 2 SIGMA COLLECTION           13B1         24S1 PERIOD 12/28/2009  - 03/30/2010  <  161       < 161 03/30/2010  - 06/28/2010  <  159       < 158 06/28/2010  - 09/28/2010  <  175       < 177 09/28/2010  - 12/27/2010  <  182       < 178 MEAN c-1

TABLE C-1.2         CONCENTRATIONS OF GAMMA EMITTERS IN SURFACE WATER SAMPLES COLLECTED IN THE VICINITY OF LIMERICK GENERATING STATION, 2010 RESULTS IN UNITS OF PCI/LITER +/- 2 SIGMA STC         COLLECTION          Mn-54  Co-58  Fe-59   Co-60 Zn-65  Nb-95 Zr-95 1-131 Cs-134 Cs-137 Ba-140 La-140 PERIOD 13B 1 12/28/2009 - 02/01 12010    5     <5    < 12    <5     < 11   <6   < 10  <7     <6     <5     < 24   <8 02/01/2010 - 03/02 /2010    8     <8    < 13    <7     < 24   < 10 < 14  < 10   < 15   <9     < 33   < 10 03/02/2010 - 03/30 /2010    4     <5    < 13    <5     <8     < 5  <9    < 14   <4     <5     < 36   <9 03/30/2010 - 04/27,/2010    3     <4    <8      <4     <7     <4   <7    < 15   <3     <4     < 30   <8 04/27/2010 - 06/01 /2010    2     <2    <4      <2     <4     <2   <4    < 13   <2     <2     < 21   <7 06/01/2010 - 06/28 '2010    6     <6    < 11    <6     < 12   <7   < 10  <8     <6     <7     < 24   <9 06/28/2010 - 08/03,/2010     1    <2    <4      <1     <3     <2   <3    <9     <1     <2     < 15   <5 08/03/2010 - 08/30,/2010     1    <1    <3      <1     <2     <1   <2    <6     <1     <1     < 11   <4 08/30/2010 - 09/28,/2010    6     <6    < 11    <7     < 11   <6   < 12  < 10   <6     <6     < 28   <9 09/28/2010 - 11/02,/2010    6     <7    < 13    <6     < 10   <7   < 10  < 12   <6     <5     < 31   <9 11/02/2010 - 11/29 /2010    5     <4    < 13    <5     <9     <4   < 12  < 12   <6     <6     < 29   < 10 11/29/2010 - 12/27,'2010    5     <6    < 13    <7     < 12   <6   < 12  < 12   <6     <6     < 35   < 14 MEAN 24S1  12/28/2009    02/02/2010    4     <4    <8      <4     <7     <4   <7    <5        4      4   < 17   <5 02/02/2010    03/02/2010    7     <8    < 17     <9    < 18   < 10 < 13  < 10      7      9   < 29   < 10 03/02/2010    03/30/2010    4     <5    < 11     <5    <9     <5   <9    < 15      4      4   < 31   < 15 03/30/2010    04/27/2010    3     <3    <7      <4     <6     <4   <5    < 14      3      3   < 22   <8 04/27/2010    06/01/2010     1    <2    <3      <1     <3     <2   <3    < 10      1      1   < 16   <5 06/01/2010    06/28/2010    6     <5    < 14     < 10  < 11   <6   < 11  <6        5      6   < 22   <8 06/28/2010    08/03/2010     1    <2    <4      <1                                 1
                                                             <3     <2   <3    < 14                 < 20   <6 08/03/2010    08/30/2010     1    <1    <3      <1                                 1
                                                             <3     <2   <3    <7                   < 13   <4 08/30/2010    09/28/2010    7     <6    < 12     <6    < 11   <8   < 12  < 12      7      6   < 27   < 11 09/28/2010    11/02/2010    6     <4    < 11    <7     < 10   <5   < 10  < 11      5      6   < 35   <8 11/02/2010    11/29/2010    4     <5    < 10     <4    <9     <5   <9    < 10      4      4   < 22   <7 11/29/2010    12/27/2010    4     <4    <5      <3     <8     <4   <6    <7        3      4   < 18   <6 MEAN C-2

TABLE C-I1.1                CONCENTRATIONS OF GROSS BETA IN DRINKING WATER SAMPLES COLLECTED IN THE VICINITY OF LIMERICK GENERATING STATION, 2010 RESULTS IN UNITS OF PCI/LITER +/- 2 SIGMA COLLECTION                     15F4             151F7               16C2           28F3 PERIOD 12/28/2009     02/02 /2010         3.9 +/- 1.8        3.0 + 1.7         3.3 +/- 1.8  < 2.5 02/02/2010      03/02 /2010         5.2 +/- 2.9        4.1 + 1.3         4.4 +/- 1.3        5.3 +/- 2.8 03/02/2010      03/30 /2010   < 2.9            < 3.2             < 3.3            < 3.1 03/30/2010      04/27 /2010   < 2.6            < 2.6             < 2.8                  3.2  +/- 1.8 04/27/2010     06/01 /2010         5.0  +/- 1.8       4.0 + 1.8         2.5 +/- 1.7        3.6  +/- 1.7 06/01/2010     06/28 /2010         5.7  +/- 2.0 < 2.7                   3.8 +/- 2.0        4.2  +/- 2.0 06/28/2010     08/03 /2010         6.2  +/- 2.1       5.3  +/-  2.0 < 2.8                  4.2  +/- 2.0 08/03/2010     08/30 /2010         6.7  +/- 2.0       5.9  +/- 2.0        3.3 +/- 1.8        3.4  +/- 1.8 08/30/2010 -   09/28 /2010         6.4  +/- 1.9       5.0  +/- 1.9        3.4 +/-  1.8       3.3  +/- 1.7 09/28/2010 -   11/02 /2010         3.7  +/- 1.8       3.8  +/- 1.8        3.6 +/-  1.9       3.4  +/- 1.8 11/02/2010 -   11/29 /2010         4.0  +/- 1.7       3.6  +/- 1.6        3.1 +/- 1.7        3.9  +/- 1.7 11/29/2010 -   12/27 /2010   < 3.2                  4.4   +/- 2.2 < 3.7                  3.4  +/- 2.2 MEAN                           5.2  +/- 2.3       4.3 +/- 1.8         3.4 +/- 1.1        3.8 +/- 1.3 TAB LE C-I1.2               CONCENTRATIONS OF TRITIUM IN DRINKING WATER SAMPLES COLLECTED IN THE VICINITY OF LIMERICK GENERATING STATION, 2010 RESULTS IN UNITS OF PCI/LITER +/- 2 SIGMA COLLECTION               15F4             1 5F7             16C2             28F3 PERIOD 12/28/2009  - 03/30/ 2010    < 158              161             < 161              163 03/30/2010  - 06/28/ 2010    < 159              159             < 159              162 06/28/2010  - 09/28/ 2010
* 177              178             < 182              178 09/28/2010  - 12/27/ 2010    < 176              180             < 182              185 MEAN THE MEAN AND 2 STANDARD DEVIATION VALUES ARE CALCULATED USING THE POSITIVE VALUES C-3

TABLE C-11.3      CONCENTRATIONS OF GAMMA EMITTERS IN DRINKING WATER SAMPLES COLLECTED IN THE VICINITY OF LIMERICK GENERATING STATION, 2010 RESULTS IN UNITS OF PCI/LITER +/- SIGMA STC        COLLECTION         Mn-54   Co-58   Fe-59   Co-60 Zn-65     Nb-95 Zr-95 1-131 Cs-134 Cs-137 Ba-140 La-140 PERIOD 15F4 12/28/2009 - 02/02/2010  <7      <7      <9      <6     <8       <6    <8    <8    <5     <6     < 27   <8 02/02/2010 - 03/02/2010  <4      <5      < 11    <5     < 11     <6    < 10  <7    <5     <5     < 22   <8 03/02/2010 - 03/30/2010  <4      <4      <7      <3     <7       <4    <8    < 15  <4     <4     < 29   <9 03/30/2010 - 04/27/2010  <3      <4      <7      <4     <7       <4    <7    < 14  <3     <4     < 30   <8 04/27/2010 - 06/01/2010  <1      <2      <4      <1     <3       <2    <3    < 11  <1     <2     < 18   <5 06/01/2010 - 06/28/2010  <6      <4.     < 11    <6     <9       <5    < 10  <7    <6     <7     < 25   <6 06/28/2010 - 08/03/2010  <2      <2      <5      <2     <4       <2    <4    < 11  <2     <2     < 20   <6 08/03/2010 - 08/30/2010  <1      <1      <3      <1     <2       <1    <2    <7    <1     <1     < 12   <4 08/30/2010 - 09/28/2010  <7      <6      <11     < 10   < 14     <8    < 12  < 12  <7     <7     < 31   < 13 09/28/2010 - 11/02/2010  <4      <5      <11     <6     < 10     <7    <9    < 11  <5     <5     < 25   < 10 11/02/2010 - 11/29/2010  <5      <4      <8      <4     <9       <5    <8    <9    <3     <5     < 23   <8 11/29/2010 - 12/27/2010  <5      <5      < 12    <5     < 10     <6    < 11  < 13  <6     <6     < 32   < 11 MEAN 15F7 12/28/2009 - 02/02/2010  <8      < 10    < 13    <9     < 14     <9    < 15  < 12  <8     <8     < 31   < 14 02/02/2010 - 03/02/2010  <4      <4      <8      <4     < 10     <5    <8    <6    <4     <4     < 17   <5 03/02/2010 - 03/30/2010  <4      <4      <9      <4     <6       <4    <7    < 15  <4     <4     < 32   < 10 03/30/2010 - 04/27/2010  <3      <3      <7      <3     <6       <4    <6    < 14  <3     <3     < 28   <7 04/27/2010 - 06/01/2010  <2      <2      <5      <2     <4       <2    <4    < 15  <2     <2     < 23   <6 06/01/2010 - 06/28/2010  <6      <6      < 12    <7     < 14     <6    < 10  <8    <8     <6     < 24   <7 06/28/2010 - 08/03/2010  <2      <2      <5      <2     <4       <2    <4    < 12  <2     <2     < 21   <5 08/03/2010 - 08/30/2010  <1      <2      <3      <1     <3       <2    <3    <8    <1     <1     < 13   <5 08/30/2010 - 09/28/2010  <6      <7      < 10    <8     < 13     <8    < 13  < 12  <6     <6     < 25   <4 09/28/2010 - 11/02/2010  <4      <4      <8      <4     <8       <4    <8    <8    <4     <4     < 23   <6 11/02/2010 - 11/29/2010  <6      <7      < 12    <7     < 12     <7    < 11  < 14  <5     <7     <34    < 13 11/29/2010 - 12/27/2010  <4      <4      < 10    <5     <9       <5    <8    < 10  <4     <5     < 23   <6 MEAN C-4

TABLE C-II.3        CONCENTRATIONS OF GAMMA EMITTERS IN DRINKING WATER SAMPLES COLLECTED IN THE VICINITY OF LIMERICK GENERATING STATION, 2010 RESULTS IN UNITS OF PCI/LITER +/- SIGMA STC         COLLECTION             Mn-54 Co-58   Fe-59   Co-60 Zn-65     Nb-95 Zr-95 1-131 Cs-134 Cs-137 Ba-140 La-140 PERIOD 16C2  12/28/2009 - 02/01/2010 (1) <6     <5      < 14    <5     < 14     <6    < 10  <9    <7     <7       22   <7 02/01/2010 - 03/02/2010      <6    <5      < 13    <5     < 14     <6    <9     <7   <5     <7       22   <7 03/02/2010 - 03/30/2010      <5    <5      < 10    <4     < 10     <5    <9    < 15  <4     <5       33   < 10 03/30/2010 - 04/27/2010      <3    <4      <7      <3     <7       <3    <6    < 15  <3     <4       26   <7 04/27/2010 - 06/01/2010      <2    <2      <5      <2     <4       <2    <4     < 14 <2     <2       23   <7 06/01/2010 - 06/28/2010      <5    <4      < 10    <5     < 12     <5    <9     <7   <5     <6       18   <7 06/28/2010 - 08/03/2010      <2    <2      <4      <2     <3       <2    <4     < 11 <2     <2       20   <5 08/03/2010 - 08/30/2010      <2    <2      <4      <2     <4       <2    <4     <9   <2     <2       17   <5 08/30/2010 - 09/28/2010      <6    <7      < 11    <8     < 14     <6    < 13   < 12 <7     <6       32   < 12 09/28/2010 - 11/02/2010      <4    <4      <7      <4     <9       <5    <8     < 10 <4     <4       25   <8 11/02/2010 - 11/29/2010      <6    <5      < 11    <6     < 10     <7    < 10   < 14 <5     <5       29   <9 11/29/2010 - 12/27/2010      <5    <5      < 11    <6     < 12     <6    <9     < 12 <5     <5       29   < 10 MEAN 28F3  12/28/2009  - 02/02/2010 (1) <4    <4      <8      <4     <8       <5    <6     <6   <4     <5       16   <6 02/02/2010  - 03/02/2010     <6    <6      < 13    <5     < 13     <6    <9     <7   <5     <6       26   <7 03/02/2010  - 03/30/2010     <5    <4      < 10    <4     < 10     <6    <8     < 14 <5     <5       32   < 13 03/30/2010  - 04/27/2010     <3    <4      <7      <4     <7       <4    <7     < 13 <3     <3       24   <8 04/27/2010  - 06/01/2010     <2    <2      <4      <2     <3       <2    <3     < 13 <2     <2       21   <6 06/01/2010  - 06/28/2010     <5    <5      < 10    <6     < 12     < 6   <9     <6   <5     <6       23   <6 06/28/2010  - 08/03/2010     <2    <2      <5      <2     <4       <2    <4     < 11 <2     <2        18  <5 08/03/2010  - 08/30/2010     <2    <2      <4      <2     <3       <2    <3     < 10 <2     <2        18  <5 08/30/2010  - 09/28/2010     <5    <6      <8      <6     < 10     <5    <8     < 10 <6     <5       27   <8 09/28/2010  - 11/02/2010     <5    <5      < 10    <5     < 10     <5    <8     < 10 <4     <4       23   <8 11/02/2010  - 11/29/2010     <5    <5      < 11    <4     <8       <5    <8     < 10 <4     <5       25   <8 11/29/2010  - 12/27/2010     <5    <5      <9      <6     <9       <4    < 10   < 11 <4     <5       28   < 10 MEAN (1) SEE PROGRAM EXCEPTIONS SECTION FOR EXPLANATION C-5

TABLE C-II1.1      CONCENTRATIONS OF GAMMA EMMITTERS IN PREDATOR AND BOTTOM FEEDER (FISH)
SAMPLES COLLECTED IN THE VICINITY OF LIMERICK GENERATING STATION, 2010 RESULTS IN UNITS OF PCI/KG W ET +/- 2 SIGMA STC    COLLECTION          K-40     Mn-54    Co-58      Fe-59      Co-60       Zn-65  1-131 Cs-134 C s-1 37 PERIOD I
16C5   PREDATOR 05/20/2010     2640   +/- 586  < 36     < 40       < 95        < 47       < 86  < 624   < 39
* 38 11/03/2010     3510   +/- 783
* 45     < 55
* 99        < 49       < 87  < 164   < 49
* 43 MEAN           3075   +/- 1230 16C5   BOTTOM FEEDER 05/20/2010     3640  +/- 799
* 55     < 66       < 171       < 51       < 115 < 955   < 41   < 48 11/03/2010     3920   +/- 857  < 54     < 60       < 120
* 42       < 126 < 187
* 53   < 60 MEAN           3780  +/- 396 29C1   PREDATOR 05/14/2010     3310  +/- 677   < 34
* 37       < 90        < 44       < 84  < 146
* 37   < 38 11/03/2010     3110  +/- 796   < 70     < 73       < 128       < 63       < 131
* 212
* 65
* 69 MEAN           3210  +/- 283 29C1   BOTTOM FEEDER 05/14/2010     3260  +/- 708   < 29     < 41       < 89        < 29
* 83
* 169   < 42   < 34 11/03/2010     3280  +/- 937   < 56     < 61       < 140       < 75       < 143
* 221   < 61   < 69 MEAN           3270  +/- 28.3
* THE MEAN AND 2 STANDARD DEVIATION VALUES ARE CALCULATED USING THE POSITIVE VALUES C-6

TABLE C-IV.1      CONCENTRATIONS OF GAMMA EMITTERS IN SEDIMENT SAMPLES COLLECTED IN THE VICINITY OF LIMERICK GENERATING STATION, 2010 RESULTS IN UNITS OF PCI/KG DRY +/- 2 SIGMA STC   COLLECTION            Be-7          K-40     M n-54      Co-58    Co-60       1-131 Cs-134       Cs-137 PERIOD 16B2  06/07/2010       3740 +/- 947    16100 +/- 1570  < 76       < 63      < 71       < 388  < 63      164   +/- 86 12/03/2010    < 925            15300 +/- 1470  < 64       < 70      < 79       < 642  < 67   < 81 MEAN                           15700 +/- 1131 16C4  06/07/2010    < 396            10800 +/- 1270  < 37       < 32      < 22       < 160  < 28      166   +/- 75 12/03/2010       1630  +/- 1380  14700 +/- 1910  < 103      < 120     < 116
* 925
* 82   < 134 MEAN                           12750 +/- 5515 33A2  06/07/2010    < 871            13700 +/- 1320  < 81       < 82      < 73       < 425
* 114  < 88 12/03/2010    < 697            13000 +/- 1280  < 66       < 66      < 73       < 495  < 55   < 68 MEAN                           13350 +/- 990
* THE MEAN AND 2 STANDARD DEVIATION .VALUES ARE CALCULATED USING THE POSITIVE VALUES C-7

TABLE C-V.1               CONCENTRATIONS OF GROSS BETA IN AIR PARTICULATE SAMPLES COLLECTED IN THE VICINITY OF LIMERICK GENERATING STATION, 2010 RESULTS IN UNITS OF E-3 PCI/CU METER +/- 2 SIGMA COLLECTIO N                     GROUP I                 I         GROUP II         I GROUP III PERIOD               10S3        lisi       14S1          13C1          6C1            22G1 12/28/2009 - 01/04/2010      14 +5       12_+5      13_5              13C5                     12_+/-T 01/04/2010 - 01/11/2010       8+/-5         8+/-5        7+/-5         <7                            10 +/- 5 01/11/2010 - 01/18/2010      24 +/-5       26 _5      29_ 6            26 +/- 5                    25 +/- 5 01/18/2010 - 01/26/2010      15 +/-4       18+/- 4      16+/- 4            24 _+/- 5                   17 +/- 4
_+
01/26/2010 - 02/01/2010      25 +6       17_ 6      22+/- 6            16    6                   19 +/- 6
_+
02/01/2010 - 02/08/2010      14 +5       17+/- 5      21 +/-+6           16     5                  17 +/- 5 02/08/2010 - 02/15/2010       8+/-4        11 +/-4       8+/-4             10 +/-t 4                   10 +/- 4 02/15/2010 - 02/22/2010      14 +4       12 +/- 4     10+/- 4           14  _+4                    10 +/- 4 02/22/2010 - 03/01/2010   <6          <6         <6              <6                             8+/-4 03/01/2010 - 03/08/2010      11 +/-4        9      <7                  12 +5                      7+4 03/08/2010 - 03/15/2010      15     5    16         20 +/-5            13 +/-5                     14+/- 5 03/15/2010 - 03/22/2010      16     5    16         16 _5            17 _5                     19+/- 5 03/22/2010 - 03/29/2010      12     5    16                (1)       18 +5                     16 +/-5 03/29/2010 - 04/05/2010       8+/-4         8          9  _5            8 _+/-4                     7_4 04/05/2010 - 04/12/2010      21 +4       16         16  _4           19 +/-5                     18+/- 4 04/12/2010 - 04/19/2010   <7             11          9  _5            9 +5                     10+/- 5 04/19/2010 - 04/26/2010          _4      15         12  +4           13 +/-5                     13+/- 4 04/26/2010 - 05/03/2010          _5      17         18  _5           17 _5                     13+/- 5 05/03/2010 - 05/10/2010          +/-5      12         11  _5           13 _+5                     9_5 05/10/2010 - 05/17/2010          _5      11         10  +5          13  _+/-5                    10+/- 5 05/17/2010 - 05/24/2010          +/-5      16         13  +/-5           12 _+/-5                    14_ 5 05/24/2010 - 06/01/2010          +/-4      16         17  _5           15 +4                     17+/- 4 06/01/2010 - 06/07/2010          _6      15         14  +/-6           13 _6                     15+/- 6 06/07/2010 - 06/14/2010          _5      10         11  _5           13 _5                     15+/- 5 06/14/2010 - 06/21/2010          +/-4      16         14  +4           17 +/-4                     17 +/- 4 06/21/2010 - 06/28/2010          +/-5      22         23  _5           20 _5                     22 +/- 6 06/28/2010 - 07/06/2010          +/-5      20         15  _5           16 _5                     14 +/- 5 07/06/2010 - 07/12/2010          +/-+6     31         26  +/-6           29 +/-6                     29 +/- 6 07/12/2010 - 07/19/2010          _5      22         25  _5           22 +/-4                     22 +/- 4 07/19/2010 - 07/26/2010          +/-6      21         14  _5           17 +/-5                     17 +/- 5 07/26/2010 - 08/02/2010          _4      19         15  _4           18 +/-4                     18 +/- 4 08/02/2010 - 08/09/2010          +/-6      21         19  _5           20 _5                     22 +/- 6 08/09/2010 - 08/16/2010          +/-5      24         25  *5           21 +/-5                     25 +/- 5 08/16/2010 - 08/23/2010          +/-5      25         26  _5           27 +/-5                     27 +/- 5 08/23/2010 - 08/30/2010          _5      15         15  +/-5           16 _5                     12 +/- 5 08/30/2010 - 09/06/2010          +/-6      27         35  +/-6           31 +/-6                     32 +/- 6 09/06/2010 - 09/13/2010          _4      15         15  _4           15 +4                     12 +/- 4 09/13/2010 - 09/20/2010          _5      14         15  _5           19 _5                     17 +/- 5 09/20/2010 - 09/27/2010          +/-6      21         21  +/-6           21 +/-6                     21 +/- 6 09/27/2010 - 10/04/2010          _4       8         11  _4           12 +/-4                      8+/-4 10/04/2010 - 10/11/2010         _4      16         16  _4           16 +/-4                     20+/- 4 10/11/2010 - 10/18/2010         _6      16         18  +/-6           17 _6                     29+/- 6 10/18/2010 - 10/25/2010         +5      17         18  _5           15 +5                     20+/- 5 10/25/2010 - 11/01/2010          +4       7          9  +/-4            8 _4                      7+/-4 11/01/2010 - 11/08/2010          _4       6          7  _4            6 +4                  <6 11/08/2010 - 11/15/2010          +4      19         16  _4           15 _4                     13+/-   4 11/15/2010 - 11/22/2010          +5      19         20  _5           16 +/-5                     19    5 11/22/2010 - 11/29/2010          _5      27         31  +/-6           23 +/-5                     19+/-   5 11/29/2010 - 12/06/2010          +/-4      13         13  _4           15 _4                     15+/-   4 12/06/2010 - 12/13/2010          -4      17         13  +4           12 _4            (2)      12+/-   4 12/13/2010 - 12/20/2010          +/-6      14         13  +/-6           10 +/-6      13 +/-6          10+/-   6 12/20/2010 - 12/27/2010          _4       9         10  +4            7 _4      10 +4          10+/-   4 12/27/2010 - 01/03/2011          _5      23         24  _4           25 +/-4      21 +/-4          21_   4 M EAN                   17 +/- 13     16 +/- 11    16 +/- 13          16 +/- 11    15 +/- 11        16 +/- 12
* THE MEAN AND 2 STANDARD DEVIATION VALUES ARE CALCULATED USING THE POSITIVE VALUES (1) SEE PROGRAM EXCEPTIONS SECTION FOR EXPLANATION (2) SEE PROGRAM CHANGES SECTION FOR EXPLANATION C-8

TABLE C-V.2                 MONTHLY AND YEARLY MEAN VALUES OF GROSS BETA CONCENTRATIONS INAIR PARTICULATE SAMPLES COLLECTED INTHE VICINITY OF UIVERICK GENERATING STATION, 2010 RESULTS IN UNITS OF E-3 PCI/CU IVETER +/- 2 SIGMA GROUP I - ON-SITE LOCATIONS             GRUP II- INTERMVEDIATE DISTANCE LOCATIONS              GROUP III - CONTROL LOCATIONS COLLECTION           MIN  NWX MEAN+              COLLECTI ON        MN   MAX  MEAN+              COLLECTION          MN   N/AX MVEAN+
PEROD                         2SD                PERIOD                     2SD                  PERIOD                       2SD Z--1 12/2&2009   - 02/01/2010     7   29 16.8 +/- 14    12/28/2009 - 02/01/2010   8    26   18.3 +/- 16.6 12/28/2009 - 02/01/2010     10   25 16.6 +/- 12 02/01)2010  - 02222010       8   21 12.7 +/- 9     02/01/2010 - 02/22,2010   10   16   13.3 7      02/01/2010 - 03/01/2010     8    17 11.2 +/- 8 03101f2010  - 04/05/2010     8   20 13.7 +/-8      03/01/2010 - 04/05/2010   8    18   13.7 9      03/01/2010 - 04/05/2010     7    19 12.4 +/- 11 03/30)2010  - 05/03/2010     9   21 14.1 +/- 8     04/05/2010 - 05/03/2010   9    19   14.4 9      04/05/2010 - 05/03/2010     10   18 13.1 +/- 7 05/03/2010  - 06/01/2010     10  17 13.3 +/- 5     05/03/2010 - 06/01/2010   12   15   13.3 3      05/3/2010  - 06/01/2010     9    17 12.5 +/- 8 06/01)2010  - 06/28/2010     10  23 16.4 +/- 8     06/01/2010 - 06/28&2010   13   20   15.7 7      06/01/2010 - 06/28/2010     15   22    17 +/- 7 06/2&2010   - 08/02/2010     14  31    21 +/- 10   06/28/2010 - 08/02/2010   16   29   20.3 10     06/28/2010 - 08/02/2010     14   29 19.9 +/- 11 08/02/2010  - 08/30/2010     15  30 22.3 +/- 10    08/02/2010 - 08/30/2010   16   27   20.8 9      06/02/2010 - 08/30/2010     12   27 21.5 +/- 13 08/30/2010  - 10/04/2010     8   35 18.9 +/- 15.9  08/30(2010 - 10/0412010   12   31   19.4 +/- 15   08/30/2010 - 10/04/2010     8    32 17.8 +/- 19 10/04/2010  - 11/01/2010     7   18 14.6 +/- 8     10/04/2010 - 11/01/2010   8    17   13.8 8      10/04/2010 - 11/01/2010     7    29    19 +/- 18 11/01/2010  - 11/29/2010     6   31 172 +/- 16     11/01/2010 - 11/29/2010   6    23     15 13     11/08/2010 - 11/29/2010     13   19 17.1 +/- 7 11/29/2010  - 01/03/2011     9   27    15 +/- 11.1 11/29/2010 - 01/03/2011   7    25     14 12     11/29/2010 - 01/03/2011     10   21 13.6 +/- 9 12/2&2009 - 01/03/2011       6   35    17 +/- 12   12/28/2009 - 01/032011    6    31     16 +/- 11   12/28/2009 - 01/03/2011     7    32    16 +/- 12
* THE IVEAN A.ND 2 STANDARD DEMA11ON VALUES AFE CALCULATED USI N3 THE POSITIVE VALUES C-9

TABLE C-V.3           CONCENTRATIONS OF GAMMA EMITTERS IN AIR PARTICULATE SAMPLES COLLECTED IN THE VICINITY OF LIMERICK GENERATING STATION, 2010 RESULTS IN UNITS OF E-3 PCI/CU METER + 2 SIGMA STC           COLLECTION                Be-7    Mn-54    Co-58   Co-60       Cs-1 34 Cs-137 PERIOD 10S3    12/28/2009    03/29/2010     126  + 42
                                          +/-     <4           6    <3          <4      <4 03/29/2010    06/28/2010      69     32 <2           3    <4          <3      <3 06/28/2010    09/27/2010     106  +/- 33  <3           3    <2          <3      <3 09/27/2010    01/03/2011      52  +/- 15  <2           2    <2          <3      <2 M EAN                    88 +/- 68 11S1    12/28/2009    03/29/2010      86 +/- 29   <3           3    <3          <3      <3 03/29/2010    06/28/2010      91 t-
                                          +/- 36  <3           7    <5          <4      <4 06/28/2010    09/27/2010     110     31 <3           5    <3          <3      <3
                                          +/-
09/27/2010    01/03/2011      47     24 <3           3    <3          <3      <3 M EAN                    84 + 53 13C1    12/28/2009    03/29/2010     117  - 40  <3           5       2        <2      <4 03/29/2010    06/28/2010      88  +/- 27  <3           4       4        <3      <3 06/28/2010    09/27/2010      86  +/- 27  <3           5       4        <4      <3 09/27/2010    01/03/2011      60  +/- 15  <2           2       3        <2      <2 M EAN                    88 +/- 46 14S1    12/28/2009    03/29/2010      91  +/-  36 <3        <4         3        <4      <3 03/30/2010    06/28/2010      88  +/-  35 <3        <4         2        <3      <3 06/28/2010    09/27/2010      75  +/-  38 <2        <4         2        <3      <3 09/27/2010    01/03/2011      60  +/-  19 <2        <2         2        <2      <2 MEAN                     79 +/- 29 22G 1   12/28/2009    03/29/2010      89  +/-  30 <4        <4         3        <3      <3 03/29/2010    06/28/2010     103  +/-  40 <5        <6         4        <5      <4 06/28/2010    09/27/2010      79  +/-  26 <3        <3         3        <2      <2 09/27/2010    01/03/2011      82  +/-  22 <2        <3         2        <3      <3 MEAN                     88 +/- 21 6C1     12/13/2010 - 01/03/2011  (1) 135 +/- 75   < 16      < 18    < 12        < 13    < 12 MEAN                                     -        -
* THE MEAN AND 2 STANDARD DEVIATION VALUES ARE CALCULATED USING THE POSITIVE VALUES (1) SEE P ROGRAM CHANG ES SECTION FOR EXPLANATION c-10

TABLE C-Vl.1             CONCENTRATIONS OF 1-131 IN AIR IODINE SAMPLES COLLECTED IN THE VICINITY OF LIMERICK GENERATING STATION, 2010 RESULTS IN UNITS OF E-3 PCI/CU METER +/- 2 SIGMA COLLECTION                     GROUP I                    GROUPII     IGROUP III PERIOD              10S3      il~i       14S       13C1        6C1     22G1 12/26/2009 - 01/04/2010    <*b
* 61      < b1
* 34                < 60 01/04/2010 - 01/11/2010    <66
* 29      < 68
* 68                < 67 01/11/2010 - 01/18/2010    <22
* 22
* 22       <12                 < 22 01/18/2010 - 01/26/2010    <29
* 30
* 30       <13                 < 29 01/26/2010 - 02/01/2010    <19       < 35      < 35
* 36                < 34 02/01/2010 - 02/08/2010    <26
* 27      <15
* 27                < 27 02/08/2010 - 02/15/2010    <16
* 30      < 30
* 31                < 29 02/15/2010 - 02/22/2010    <21       <21       < 21
* 21                < 11 02/22/2010 - 03/01/2010    <16
* 30      < 30
* 30                < 28 03/01/2010 - 03/08/2010    <15       < 37      < 37       < 37                < 36 03/08/2010 - 03/15/2010    <20       < 37      < 37       < 37                < 36 03/15/2010 - 03/22/2010    <52
* 23      < 53       < 54                < 52 03/22/2010 - 03/29/2010    <14
* 14            (1)  < 15                < 14 03/29/2010 - 04/05/2010    <31
* 31      <  37      <18                 < 31 04/05/2010 - 04/12/2010    <12
* 22
* 22
* 22                < 21 04/12/2010 - 04/19/2010    < 24
* 24
* 25      < 25                < 24 04/19/2010 - 04/26/2010    <22
* 30
* 30
* 30                < 29 04/26/2010 - 05/03/2010    < 35
* 36
* 36      < 36                < 15 05/03/2010 - 05/10/2010    <12
* 30
* 30
* 30                < 29 05/10/2010 - 05/17/2010    <14       < 26
* 26      < 27                < 26 05/17/2010 - 05/24/2010    <12
* 22
* 22      < 23                < 21 05/24/2010 - 06/01/2010    <40       <17       <  41      < 41                < 39 06/01/2010 - 06/07/2010    <13
* 32
* 32
* 32                < 32 06/07/2010 - 06/14/2010    < 34      < 34      < 35       <15                 < 34 06/14/2010 - 06/21/2010    <9        <18       <18        <18                 < 17 06/21/2010 - 06/28/2010    <43       < 43      < 24       < 42                < 51 06/28/2010 - 07/06/2010    <12       < 28
* 29
* 28                < 29 07/06/2010 - 07/12/2010    < 37      < 37      < 37
* 36                < 16 07/12/2010 - 07/19/2010    <16       < 22
* 22
* 22                < 22 07/19/2010 - 07/26/2010    <16
* 28
* 29
* 28                < 29 07/26/2010 - 08/02/2010    <13       < 30
* 31       < 30                < 30 08/02/2010 - 08/09/2010    <23       <12
* 23
* 22                < 23 08/09/2010 - 08/16/2010    <14       < 33      < 33       < 33                < 33 08/16/2010 - 08/23/2010    <26
* 26
* 27
* 14                < 27 08/23/2010 - 08/30/2010    <22
* 22
* 12
* 22                < 22 08/30/2010 - 09/06/2010    < 34      < 34
* 19       < 33                < 34 09/06/2010 - 09/13/2010    < 37      < 37      < 37       < 37                < 16 09/13/2010 - 09/20/2010    <28
* 28
* 29       <16                 < 30 09/20/2010 - 09/27/2010    <14
* 26      < 26
* 26                < 26 09/27/2010 - 10/04/2010    < 37      < 37      < 38       < 37                < 16 10/04/2010 - 10/11/2010    <18       < 41      < 41
* 41                < 43 10/11/2010 - 10/18/2010    <16
* 29      < 30
* 29                < 30 10/18/2010 - 10/25/2010    < 40      < 40      < 40       < 39                <17 10/25/2010 - 11/01/2010    <41       < 17      < 41       < 41                < 41 11/01/2010 - 11/08/2010    <50
* 50      < 50
* 50                < 28 11/08/2010 - 11/15/2010    <42
* 42      < 42
* 31                < 43 11/15/2010 - 11/22/2010    <16       < 37      < 38       < 37                < 38 11/22/2010 - 11/29/2010    < 55      < 55      < 24       < 55                < 56 11/29/2010 - 12/06/2010    <56
* 56      < 57       < 56                < 24 12/06/2010 - 12/13/2010    <36
* 36      < 36       < 36          (2)   < 16 12/13/2010 - 12/20/2010    < 54      < 54      < 58       < 57       < 56     < 58 12/20/2010 - 12/27/2010    <58
* 58      <54        < 53       < 36     < 54 12/27/2010 - 01/03/2011    <44       < 44      < 49       < 48       < 44     < 49 MEAN (1) SEE PROGRAM EXCEPTIONS SECTION FOR EXPLANATION (2) SEE PROGRAM CHANGES SECTION FOR EXPLANATION C-11

TABLE C-VII.1   CONCENTRATIONS OF 1-131 IN MILK SAMPLES COLLECTED IN THE VICINITY OF LIMERICK GENERATING STATION, 2010 RESULTS IN UNITS OF PCI/LITER +/- 2 SIGMA CONTROL FARM                          INDICATOR FARM COLLECTION    23F1           36E1       10F4          18E 1           1 9B1   25C1 PERIOD 01/12/2010    < U.4        < 0.5      < U.4         < 0.5           < 0.5   < 0.3 02/09/2010    < 0.6                   < 0.7         < 0.8           < 0.7   < 0.8 03/16/2010    < 0.5                   < 0.4         < 0.4           < 0.4   < 0.6 04/06/2010    < 0.6        < 0.4      < 0.5         < 0.5           < 0.5   < 0.4 04/20/2010    < 0.4                   < 0.8         < 0.6           < 0.6   < 0.7 05/04/2010    < 0.7                   < 0.9         < 0.9           < 0.9   < 0.6 05/18/2010    < 0.5                   < 0.7         < 0.5           < 0.5   < 0.6 06/01/2010    < 0.6                   < 0.6         < 0.5           < 0.6   < 0.6 06/15/2010    < 0.6                   < 0.8         < 0.8           < 0.8   < 0.8 06/30/2010    < 0.4                   < 0.6         < 0.7           < 0.4   < 0.6 07/13/2010    < 0.5        < 0.7      < 0.6         < 0.7           < 0.7   < 0.6 07/27/2010    < 0.8                   < 0.8         < 0.8           < 0.8   < 0.8 08/11/2010    < 0.5                   < 0.7         < 0.6           < 0.7   < 0.9 08/24/2010    < 0.5                   < 0.6         < 0.6           < 0.6   < 0.9 09/07/2010    < 0.6                   < 0.7         < 0.7           <  0.8  < 0.7 09/22/2010    < 0.6                   < 0.6         < 0.6           <  0.8  < 0.7 10/05/2010    < 0.6        < 0.8      < 0.7         < 0.7           <  0.6  < 0.6 10/19/2010    < 0.6                   < 0.7         < 0.8           <  0.8  < 0.8 11/02/2010    < 0.5                   < 0.6         < 0.7           <  0.7  < 0.7 11/16/2010    < 0.6                   < 0.7         < 0.7           <  0.7  < 0.7 11/30/2010    < 0.3                   < 0.4         < 0.4           <  0.4  < 0.5 12/14/2010    < 0.5                   < 0.7         < 0.7           < 0.7   < 0.6 MEAN C-12

TABLE C-V 11.2     CONCENTRATIONS OF GAMMA EMITTERS IN MILK SAMPLES COLLECTED IN THE VICINITY OF LIMERICK GENERATING STATION, 2010 RESULTS IN UNITS OF PCI/LITER +/- 2 SIGMA STC   COLLECTION         K-40      Cs-134 Cs-137  Ba-140   La-140 PERIOD I
10F4  01/12/2010    1220     94     <4               27       7 02/09/2010    1310     146    <5               30       8 03/16/2010    1370     1 53   <5               24       8 04/06/2010    1220     1 22   <7               57       11 04/20/2010    1280     98     <4               40       11 05/04/2010    1280     1 35   <5               43       14 05/18/2010    1290     1 28   <5               37       13 06/01/2010    1320     1 66   <6               50       8 06/15/2010    1390      131   <6               42       14 06/29/2010    1470     1 56   <6               35       7 07/13/2010    1370     144    <5               22       7 07/27/2010    1340     151    <7               29       9 08/10/2010    1260      111   <3               22       6 08/24/2010    1310      1 50  <4               39       8 09/07/2010    1190      1 66  <7               34       13 09/21/2010    1240      1 25  <5               32       8 10/05/2010    1300      1 38  <5               21       7 10/19/2010    1390      1 50  <6               29       9 11/02/2010    1280      1 04  <4               19       6 11/16/2010    1210      1 31  <6               29       9 11/30/2010    1270      149   <7               38       10 12/14/2010    1340      1 28  <5               27       8 MEAN          1302 +/- 1 37 18E1  01/12/2010    1350  +/- 113     <4               36       10 02/09/2010    1330  +/- 1 59    <6               35       8 03/16/2010    1290  +/- 143     <6               24       7 04/06/2010    1240  +/- 108     <10              45       12 04/20/2010    1240  +/- 94      <3               41       12 05/04/2010    1140  +/- 130     <5               44       14 05/18/2010    1310  +/- 133     <5               34       11 06/01/2010    1260  + 114     <5               34       9 06/15/2010    1290    S1 36   <5               43       8 06/30/2010    1160   - 151    <7               37       9 07/13/2010    1230  + 166     <7               26       6 07/27/2010    1440    S1 57   <10              42       12 08/11/2010    1230  + 160     <5               25       7 08/24/2010    1050  + 137     <3               35       10 09/07/2010    1160  +/- 141     <7               42       11 09/22/2010    1220  +118      <5               33       8 10/05/2010    1060  + 152     <6               29       6 10/19/2010    1180  + 142     <7               31       9 11/02/2010    1210   - 107    <5               24       6 11/16/2010    1260    S1 22   <5               26       8 11/30/2010    1200    S1 35   <5               32       9 12/14/2010    1460    S1 37   <5               28       9 MEAN          1241  +/- 203 THE MEAN AND 2 STANDARD DEVIATION VALUES ARE CALCULATED USING THE POSITIVE VALUES C-13

TABLE C-VII.2      CONCENTRATIONS OF GAMMA EMITTERS IN MILK SAMPLES COLLECTED IN THE VICINITY OF LIMERICK GENERATING STATION, 2010 RESULTS IN UNITS OF PCI/LITER +/- 2 SIGMA STC   COLLECTION         K-40      Cs-134 Cs-137   Ba-140  La-140 PERIOD 19B1  01/12/2010    1220      1 02                    31    < 9 02/09/2010    1260      146                     35    < 9 03/16/2010    1310      131                     33    < 8 04/06/2010    1300      1 30                    37    <10 04/20/2010    1360     83                       53    *15 05/04/2010    1350      119                     49    <14 05/18/2010    1190      124                     32    < 7 06/01/2010    1370      120                     38    <12 06/15/2010    1190      111                     33    <10 06/29/2010    1400      1 37                    40    <13 07/13/2010    1380      190                     33    < 8 07/27/2010    1330      142                     26    < 7 08/10/2010    1390      1 39                    28    <8 08/24/2010    1320      128                     47    <14 09/07/2010    1160      145                     39    < 11 09/21/2010    1440      126                     42    <10 10/05/2010    1240      1 57                    24    < 6 10/19/2010    1460      1 54                    33    <10 11/02/2010    1380     98                       20    <6 11/16/2010    1320      122                     26    < 7 11/30/2010    1050      1 36                    33    < 9 12/14/2010    1320      105                     33    <10 MEAN          1306 +/- 198 23F1  01/12/2010    1330      128     6               47       14 02/09/2010    1260      1 78    9               52       15 03/16/2010    1360      116     4               20       6 04/06/2010    1320      120     5               40       11 04/20/2010    1400     85       4               44       12 05/04/2010    1390      112     4               36       10 05/18/2010    1320      1 23    4               34       9 06/01/2010    1300      171     6               56       11 06/15/2010    1340      1 26    6               42       14 06/29/2010    1260      1 25    5               28       9 07/13/2010    1410      168     10              31       10 07/27/2010    1390      143     8               35       9 08/10/2010    1390      1 39    6               31       10 08/24/2010    1270      143     2               36       6 09/07/2010    1230      1 35    5               27       10 09/21/2010    1220      1 03    4               25       8 10/05/2010    1360      1 30    5               19       6 10/19/2010    1140      1 43    5               28       9 11/02/2010    1360      119     5               23       7 11/16/2010    1170      1 26    6               23       8 11/30/2010    1270      1 32    5               26       7 12/14/2010    1320      101     4               24       6 MEAN          1310  +/- 150
* THE MEAN AND 2 STANDARD DEVIATION VALUES ARE CALCULATED USING THE POSITIVE VALUES C-14

TAB LE C-VII.2     CONCENTRATIONS OF GAMMA EMITTERS IN MILK SAMPLES COLLECTED IN THE VICINITY OF LIMERICK GENERATING STATION, 2010 RESULTS IN UNITS OF PCI/LITER +/- 2 SIGMA STC   COLLECTION         K-40      Cs-134 Cs-137  Ba-140   La-140 PERIOD 25Cl  01/12/2010    1380      118   <6             <  45    < 10 02/09/2010    1260      119   <4             <  22    <6 03/16/2010    1370      129   < 10
* 38    <  10 04/06/2010    1350      118   <6             <  39    <  13 04/20/2010    1340     88     <4             <  44    <  14 05/04/2010    1230      101   <4
* 30    <  11 05/1812010    1380      123   <5             <  45    <  11 06/01/2010    1340      142   <5             < 48     < 14 06/15/2010    1350      158   <5             < 48     < 11 06/29/2010    1360      131   <6
* 29     <8 07/13/2010    1180      137   <6             <21      <6 07/27/2010    1210      1 55  <6             < 29     <7 08/10/2010    1140      182   <7             *41      < 11 08/24/2010    1120      110   <3             < 34     <6 09/07/2010    1190      126   <5             < 29     <9 09/21/2010    1240      116   <5             < 32     <9 10/05/2010    1500      151   <6             <  25    <9 10/19/2010    1270      1 39  <5
* 31    <8 11/02/2010    1280      112   <4             <  21    <6 11/16/2010    1290      131   <5             <  28    <9 11/30/2010    1220      135   <5             <  30    <8 12/1412010    1230      110   <4             <  21    <7 MEAN          1283   +/- 184 36E1  01/12/2010    1150   +/- 120    <5       5     <  33    < 13 04/06/2010    1160   +/- 98     <3       4
* 24    <9 07/13/2010    1200   +/- 93     <3       4     <  15    <4 1010512010    1210   +/- 147    <6       6
* 23    <6 MEAN          1180   +/- 59 THE MEAN AND 2 STANDARD DEVIATION VALUES ARE CALCULATED USING THE POSITIVE VALUES C-15

TABLE C-V 111.1                                CONCENTRATIONS OF GAMMA EMITTERS IN BROAD LEAF VEGETATION SAMPLES COLLECTED IN THE VICINITY OF LIMERICK GENERATING STATION, 2010 RESULTS IN UNITS OF PCI/KG WET +/- 2 SIGMA STC    COLLECTION                                    Be-7        K-40       Mn-54  Co-58 Co-60 1-131 Cs-134 Cs-137 Ra-226             Th-228     Th-232 PERIOD 11S3  06/24/2010  Cabbage               (1) < 169            5190 +/-  468    < 19    < 20 < 18  < 42  < 18   < 18   < 381          < 30       < 93 06/24/2010  Collards                  < 191            4760 +/-  448    < 19    < 22 < 25  < 49  *18    < 22   < 395          < 31       < 94 07/20/2010  Cabbage                       267   +/- 207  3420 +/-  506    < 25    < 25 < 22  < 28  < 24   < 24   < 527          < 45       < 115 07/20/2010  Collards                      168   +/- 133  4550 +/-  446    < 23    < 22 < 21  < 26  < 19   < 19   < 439          < 42       < 83 07/20/2010  Swiss Chard               < 272            5430 +/-  471    < 26    < 26 < 26  < 31  < 27   < 27   < 697          < 54       < 110 08/17/2010  Cabbage                   < 169            4430 +/-   369   < 17    < 16 < 15  < 56  < 15   < 17   < 365             71 +/- 20 < 51 08/17/2010  Collards                  < 168            3680 +/-  334    < 17    < 17 < 16  < 58  < 16   < 17   < 373          < 26       < 77 08/17/2010  Swiss Chard                   425   +/- 125  4040 +/-  293    < 14    < 14 < 13  < 42  < 12   < 12   < 263          < 22       < 60 09/13/2010  Cabbage                   < 112            4740 +/-  305    < 12    < 12 < 15  < 48  < 11   < 12   < 301          < 19       < 45 09/13/2010  Collards                      124   +/- 101  4840 +/-  299    < 13    < 13 < 14  < 53  < 12   < 14   < 247          < 21       < 55 09/13/2010  Swiss Chard                   138   +/- 121  3720 +/-  278    < 12    < 13 < 15  < 46  < 11   < 12   < 204          < 21       < 50 MEAN                                     224 +/- 251    4436 +/-    1297   -
13S3  06/24/2010  Collards              (1) < 178            6370 +/-  490    < 22    < 18 < 21  < 45  < 18   < 20   < 453          < 32       < 80 06/24/2010  Swiss Chard               < 194            6100 +/-   532   < 24    < 22 < 24  < 44  < 18   < 23      1390 +/- 424  < 29       < 93 07/20/2010  Cabbage                       564   +/- 248  3500 +/-  577    < 31    < 29 < 34  < 36  < 25   < 35      4000 +/- 810  < 46       <  134 07/20/2010  Collards                  < 191            3830 +/-   508   < 20    < 24 < 20  < 29  *19    < 23      1380 +/- 478  < 44       <  108 07/20/2010  Swiss Chard                   308   +/- 144  5220 +/-   532   < 23    < 17 < 17  < 27
* 23   < 20   < 556          < 43       < 94 08/17/2010  Cabbage                       364   +/- 184  3490 +/-   327   < 16    < 16 < 16  < 58  < 16   < 19      3260 +/- 487     99 +/- 28 < 85 08/17/2010  Collards                  < 173            4970 +/-  406    < 15    < 17 < 15  < 49  < 13   < 13      2010 +/- 433  < 31       < 59 08/17/2010 Swiss Chard                   327   +/- 98   8510 +/-  281    < 12    < 13 < 14  < 43  < 11   < 12      2770 +/- 271     58 +/- 18 < 50 09/13/2010 Collards              (1) < 125            4830 +/-  288    < 12    *14  < 15  < 53  < 11   < 12      4140 +/- 342  < 23           45 +/- 32 09/13/2010  Swiss Chard               < 91             5160 +/-   233   < 9     < 10 < 11  < 54  <9     <8     < 200             20 +/- 11 < 33 MEAN                                     391   +/- 236  5198 +/- 3056      -                                       2707 +/- 2312    59 +/- 79   -
31G1   06/24/2010 Broccoli Leaves             206            4320 +/-  455    < 20    < 22 < 20
* 56  < 19   < 24   < 515          < 42       < 95 06/24/2010 Cabbage                     211            5620 +/-   561   < 26    < 23 < 38  < 43  < 19   < 27   < 445          < 34       < 110 06/2412010 Cauliflower Leaves          175            4760 +/-  471    < 20    < 23 < 21  < 48  < 19   < 20   < 475          < 38       < 101 07/20/2010 Pickel Leaves                1140   +/-  227 3990 +/-  476    < 26    < 23 < 25  < 31
* 23   < 25   < 569          < 50       < 101 07/20/2010 Yellow Squash Leaves         2070   +/-  298 3940 +/-   507   < 22    < 25 < 22  < 27  < 23   < 28   < 513          < 47       < 108 07/20/2010 Zucchini Leaves              1210   +/-  209 3490 +/-  432    < 22    < 15 < 21  < 25  < 18   < 22   < 500
* 30
* 104 08/17/2010 Mellon Leaves                2150   +/-  134 6250 +/-   263   < 8     <9   < 11  < 30  <8     <9     < 203             68 +/- 16     35 +/- 20 08/17/2010 Yellow Squash Leaves         1930   +/-  106 5880 +/-   207   < 7     <8   <9    < 26  <7     <8     < 161             30 +/- 12 < 37 08/17/2010 Zucchini Leaves              1830   +/-  125 5330 +/-   240   < 9     < 10 < 12  < 33  <9     < 10   < 191          < 16           36 +/- 21 09/13/2010 Broccoli Leaves                 85  +/-  72  5120 +/-   186   < 7     <7   <8    < 40  <6     <7     < 164          < 12       < 28 09/13/2010 Brussel Sprout Leaves     < 91             5600 +/-   201   < 9     < 10 < 10  < 54  <8     <9     < 208          < 17       < 35 09/13/2010 Cabbage                       263   +/- 74   9660 +/-   221   < 9     < 10 < 10  < 54  <8     <8        2080 +/- 224  < 15           36 +/- 16 MEA N                                   1335 +/- 1616   5330 +/-    3222                                                          49 +/- 54     36 +/- 2
* THE MEAN AND 2 STANDARD DEVIATION VALUES ARE CALCULATED USING THE POSITIVEVALUES (1) SEE PROGRAM EXCEPTIONS SECTION FOR EXPLANATION C-16

TABLE C-IX.1    QUARTERLY TLD RESULTS FOR LIMERICK GENERATING STATION, 2010 RESULTS IN UNITS OF MILLI-ROENTGEN/STD. MONTH +/- 2 STANDARD DEVIATIONS STATION              MEAN          JAN - MAR       APR - JUN     JUL - SEP  OCT - DEC CODE               +/- 2 S.D.
2E1                7.0 +/- 1.3        6.7 +/- 0.6      6.5 +/- 0.3      7.7 +/- 0.8  7.2 +/- 0.8 3S1                7.0 +/- 0.6        6.7 +/- 0.6      7.0 +/- 1.0      7.3 +/- 1.0  6.9 +/- 0.8 4E1                5.3 +/- 0.6        5.0 +/- 0.3      5.2 +/- 0.4      5.6 +/- 0.7  6.1 +/- 0.6 5H1                8.4 +/- 1.3        7.8 +/- 0.4      8.3 +/- 0.6      9.1 +/- 0.4  8.2 +/- 1.3 5S1                7.5 + 1.0        7.5 +/- 0.6      7.0 +/- 0.3      8.0 +/- 0.5  7.5 +/- 1.0 6C1                7.3 +/- 1.6        6.4 +/- 0.9      7.4 +/- 1.4      8.0 +/- 0.6  6.9 +/- 0.7 7E1                7.1 +/- 0.6        7.2 +/- 0.8      6.8 +/- 0.5      7.4 +/- 1.0  8.0 +/- 0.5 7S1                7.0 +/- 1.2        7.0 +/- 1.1      6.4 +/- 0.5      7.6 +/- 0.8  7.4 +/- 1.3 9C1                6.8 +/- 1.1        6.6 +/- 0.9      6.3 +/- 0.5      7.4 +/- 1.0  6.5 +/- 0.7 10E1               6.9 +/- 1.1        6.6 +/- 0.7      6.5 +/- 0.4      7.5 +/- 0.7  7.4 +/- 0.4 10F3               6.9 +/- 1.1        7.1 +/- 1.0      6.3 +/- 0.1      7.3 +/- 1.4  7.4 +/- 0.7 10S3               7.0 +/- 1.7        6.6 +/- 0.6      6.5 +/- 0.8      8.0 +/- 0.6  7.2 +/- 0.8 1iSi               7.9 +/- 1.7        7.6 +/- 0.5      7.2 +/- 0.7      8.8 t 1.2  8.1 +/- 1.1 13C1               5.3 + 0.8        5.2 +/- 0.5      4.9 +/- 0.2      5.7 +/- 0.5  5.5 +/- 0.5 13E1               7.0 +/- 1.3        6.6 +/- 0.4      6.7 +/- 0.5      7.8 +/- 0.7  7.1 +/- 1.0 13S2               9.3 +/- 1.0        9.2 + 1.2      8.8 +/- 1.3      9.8 +/- 1.4  9.5 +/- 1.0 14S1               6.2 +/- 1.0        6.1 +/- 0.6      5.7 +/- 0.7      6.7 +/- 1.1  6.8 +/- 0.8 15D1               6.9 +/- 1.4        6.7 + 0.5      6.3 +/- 0.6      7.7 +/- 0.8  7.4 +/- 0.8 16F1               7.0 +/- 0.8        6.8 +/- 0.5      6.7 +/- 0.5      7.4 +/- 0.6  7.5 +/- 0.7 1781               6.6 +/- 0.6        6.6 + 0.5      6.3 +/- 0.3      6.9 +/- 0.9  6.5 +/- 0.2 18S2               7.2 +/- 1.5        7.1 +/- 0.7      6.5 +/- 1.7      8.0 +/- 0.8  7.9 +/- 1.0 19D1               6.6 +/- 1.0        6.5 + 0.7      6.2 +/- 0.4      7.2 +/- 1.0  7.0 +/- 0.8 20D1               6.3 +/- 0.8        6.6 + 0.5      5.8 +/- 0.5      6.4 +/- 0.8  6.2 +/- 0.4 20F1               6.6 +/- 0.6        6.7 + 0.8      6.3 +/- 1.3      6.9 +/- 0.5  7.2 +/- 0.9 21S2               6.8 +/- 1.7        6.5 +/- 0.8      6.1 +/- 0.6      7.7 +/- 0.6  6.7 +/- 0.4 23S2               6.3 +/- 1.2        5.8 +/- 0.3      6.2 +/- 0.3      7.0 + 0.9  6.8 +/- 1.0 24D1               6.4 +/- 0.9        6.5 + 0.7      5.9 +/- 1.1      6.8 +/- 0.8  5.9 +/- 0.4 25D1               5.9 +/- 0.7        6.0 + 1.0      5.5 +/- 0.8      6.2 +/- 0.7  6.1 +/- 0.8 25S2               6.0 +/- 0.7        5.9 + 0.8      5.7 +/- 0.7      6.4 +/- 1.0  6.1 +/- 1.1 26S3               5.9 +/- 1.2        5.5 + 0.6      5.7 +/- 0.6      6.6 + 0.7  6.4 +/- 0.7 28D2               6.2 +/- 1.3        6.1 + 0.4      5.6 +/- 0.4      6.9 +/- 0.4  6.6 +/- 0.6 29E1               6.9 +/- 1.1        6.5 +/- 1.0                (1)  7.3 + 0.9  6.7 +/- 0.5 29S1               6.3 +/- 1.3        6.7 +/- 1.9      5.6 +/- 0.4      6.7 +/- 0.4  6.6 +/- 0.8 31D1               8.0 +/- 1.9        8.6 + 1.2      6.9 +/- 0.5      8.4 + 1.3  8.4 +/- 0.6 31D2               6.8 +/- 1.2        6.6 +/- 0.6      6.3 +/- 0.3      7.5 + 0.3  7.3 +/- 0.6 31S1               7.1 +/- 1.6        7.2 +/- 1.4      6.3 +/- 0.6      7.9 +/- 0.7  7.5 +/- 0.5 34E1               6.5 +/- 1.4        6.2 +/- 0.5      6.0 +/- 0.9      7.3 +/- 0.4  7.1 +/- 0.4 34S2               7.0 +/- 0.8        6.9 +/- 0.8      6.6 +/- 0.5      7.4 +/- 1.0  7.8 +/- 0.8 36D1               6.3 +/- 0.8        5.9 +/- 0.7      6.2 +/- 0.7      6.7 +/- 0.7  6.5 +/- 0.7 36S2               7.6 +/- 0.8        7.7 +/- 0.6      7.1 +/- 0.7      7.9 +/- 0.6  7.2 +/- 0.3 (1) SEE PROGRAM EXCEPTIONS SECTION FOR EXPLANATION C-17

TABLE C-IX.2        MEAN QUARTERLY TLD RESULTS FOR THE SITE BOUNDARY, MIDDLE AND CONTROL LOCATIONS FOR LIMERICK GENERATING STATION, 2010 RESULTS IN UNITS OF MILLI-ROENTGEN/STD. MONTH +/- 2 STANDARD DEVIATIONS OF THE STATION DATA COLLECTION           SITE BOUNDARY              INTERMEDIATE           CONTROL PERIOD                    +/-2 S.D.
JAN-MAR                  6.9 +/- 1.8                  6.5 +/- 1.4           7.8  +/- 0.0 APR-JUN                  6.5 +/- 1.6                  6.2 +/- 1.1           8.3  +/- 0.0 JUL-SEP                  7.6 +/- 1.8                  7.1 +/- 1.4           9.1  +/- 0.0 OCT-DEC                  7.3 +/- 1.6                  6.9 +/- 1.4           8.2  +/- 0.0 TABLE C-IX.3        

==SUMMARY==
OF THE AMBIENT DOSIMETRY PROGRAM FOR LIMERICK GENERATING STATION, 2010 RESULTS IN UNITS OF MILLI-ROENTGEN/STD. MONTH LOCATION                      SAMPLES         PERIOD       PERIOD      PERIOD MEAN ANALYZED        MINIMUM      MAXIMUM           +/-2 S.D.
SITE BOUNDARY                     64            5.5           9.8       7.1 +/- 1.9 INTERMEDIATE                       91           4.9           8.6       6.7+/- 1.5 CONTROL                            4            7.8           9.1       8.4+/- 1.1 SITE BOUNDARY STATIONS- 10S3, 11S1, 13S2, 14S1, 18S2,21S2,23S2,25S2,26S3, 29S1, 31S1, 34S2, 36S2, 3S1, 5S1,7S1 INTERMEDIATE STATIONS - 10E1, 10F3, 13C1, 13E1, 15D1, 16F1, 17B1, 19D1, 20D1, 20F1, 24D1, 25D1, 28D2, 29E1, 2E1, 31D1, 31D2, 34E1, 36D1, 4E1, 6C1, 7E1,9C1 CONTROL STATIONS - 5H1 C-18

FIGURE C-1 MEAN MONTHLY TOTAL GROSS BETA CONCENTRATIONS IN DRINKING WATER SAMPLES COLLECTED IN THE VICINITY OF LGS, 1982 - 2010 12 10
                      --     - --  - --      -  ----  H--      :I------                                    ---
4      i:
I                   I
                          ,,,:                          I  I
* CONTROL
                              -*--INDICATOR.                     .      .       .      .     ..             .
0 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 00 01 02 03 04 05 06 07 08 09 10 11 Note: 2005 analysis changed from Insoluble &Soluble to Total Gross Beta  YEAR LGS CRITICALITY                                      LGS CHANGED TO TOTAL GROSS BETA AT THE BEGINNING UNIT NO. 1: 12/22/84                              OF 2005. PREVIOUS DATA INCLUDED SUMMATION OF LESS UNIT NO. 2: 08/11/89                              THAN VALUES.
C-19

FIGURE C-2 MEAN ANNUAL CS-137 CONCENTRATIONS IN FISH SAMPLES COLLECTED IN THE VICINITY OF LGS, 1982 - 2010 65  .. ..  . . . . ..      .
       -,---16C5
       --- 20S1 55                                                           --------------
Note: Second half of 2000       .
45        """"switched                           to reporting < MDC
                 *    ,.*!               .Using               MDC values result in a larger number. LLD < 150 35                                                     pCi/kg.                                -------
LGS CRITICALITY UNIT NO. 1: 12/22/84 UNIT NO. 2: 08/11/89 82 83 84 85 86 87 88 89 90 91        92 93 94 95 96 97 98 99 00 01 02 03 04 05 06 07 08 09 10 YEAR CONTROL     =   29C1 Station 20S1 discontinued in 1995 C - 20

FIGURE C-3 CONCENTRATIONS OF CS-137 IN SEDIMENT SAMPLES COLLECTED IN THE VICINITY OF LGS, 1982 - 2010 1400
                       *  ***-.--16B2                                                  :
1200       ...                                                              16C4 16C4     -:....
* LGS CRITICALITY                      ---- 33A2
                                '     UNIT NO. 1: 12/22/84 1000                --              UNIT NO. 2: 08/11/89      .   . .
CONTROL =33A2 a  800.    .
E 00       ...................       .................               .......................
2-00
  -200 82 83 85 86 88 89 91 92 94 95 97 98 00 01 03 04 06 07 09 10 Year C -21

FIGURE C-4 MEAN MONTHLY GROSS BETA CONCENTRATIONS IN AIR PARTICULATE SAMPLES COLLECTED IN THE VICINITY OF LGS, 1982 - 2010 150
                                                                                                                          -u-Group I 135       .-....               .        ............                                               .       ,          --- Group II 120 .....         .... . . . .                   . .- .    -.---......                                                .-- Group III Chernobyl 105--                - --- - -..                                                    .. .
E   90     - - ------ -,-- --               ,- , - -- - - -- - - -- - - -- - - - - - --
o- --                                                           --            - - ----- - - - , -- - -- -
o ------
o                                                       LGS CRITICALITY C'?
60   T        -----------.---------                            UNIT NO. 1: 12/22184 UNIT NO. 2: 08/11/89 LU              :L 45      ....        .. .. .. '---.                                         ..
0-0       i        ,      ,       ,    ,       ,       i    i   i   i    i    i         ,i ,i                  ,         1   1   1   1 82           84             86           88        90       92      94        96    98     00      02     04       06       08      10 YEAR C - 22

p FIGURE C-5 MEAN WEEKLY GROSS BETA CONCENTRATIONS IN AIR PARTICULATE SAMPLES COLLECTED IN THE VICINITY OF LGS, 2010 50
      *---GROUP I
      ---- GROUP II 40 ... GROUP III....................................
10 30................----......   . .................................
10.)
0    I 0
3   6   9   12   15   18   21    24   27    30  33  36   39 42 45 48 51 WEEK NO.
C - 23

FIGURE C-6 MEAN QUARTERLY AMBIENT GAMMA RADIATION LEVELS (TLD)
IN THE VICINITY OF LGS, 1985 - 2010 13 SITE 12                                    .                          .INTERMEDIATE                -..
CONTROL
                                                                                              -- o-Control 51 10                              .   ..       . ., . . . . . . *.. . . . ..    .... --
9             :11                        .                                           .   . .   . .
8......---                          ---------------------------------
4              ,  ,                                                        ;      I  I I I I   I       ,     I 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 00 01 02 03 04 05 06 07 08 09 10 11 YEAR NOTE: Control Station 5H1 became the only distant location beginning in 1995 0-24

APPENDIX D DATA TABLES AND FIGURES COMPARISON LABORATORY

The following section contains data and figures illustrating the analyses performed by the quality control laboratory, Environmental Incorporated (ENV). Duplicate samples were obtained from several locations and media and split between the primary laboratory, Teledyne Brown Engineering (TBE) and Environmental, Inc (ENV).
Comparison of the results for most media was within expected ranges.
D-1

Intentionally Left Blank D-2

TABLE D-1.1 CONCENTRATIONS OF TOTAL GROSS BETA IN DRINKING WATER SAMPLES COLLECTED INTHE VICINITY OF LIMERICK GENERATING STATION, 2010 RESULTS IN UNITS OF PCI/LITER +/- 2 SIGMA COLLECTION                         16C2 PERIOD 12/28/2009   02/01/2010       1.2  +/- 0.6 02/01/2010   03/02/2010       2.9  +/- 1.1 03/02/2010   03/30/2010 < 1.8 03/30/2010   04/27/2010 < 2.0 04/27/2010   06/01/2010       1.0  +/- 0.6 06/01/2010   06/28/2010       2.5  +/- 0.9 06/28/2010   08/03/2010       2.5  +/- 1.1 08/03/2010   08/30/2010       2.5  +/- 1.1 08/30/2010   09/28/2010       2.3  +/-  1.1 09/28/2010   11/02/2010       2.3  +/-  1.1 11/02/2010   11/29/2010       2.8  +/-  0.9 11/29/2010   12/27/2010       2.3  +/-  0.8 MEAN                     2.2 +/- 1.2 TABLE D-I.2 CONCENTRATIONS OF TRITIUM IN DRINKING WATER SAMPLES COLLECTED IN THE VICINITY OF LIMERICK GENERATING STATION, 2010 RESULTS IN UNITS OF PCI/LITER +/- 2 SIGMA COLLECTION                  16C2 PERIOD 12/28/2009   03/30/2010 < 138 03/30/2010   06/28/2010 < 168 06/28/2010   09/28/2010 < 154 09/28/2010 - 12/27/2010 < 144 MEAN D-3

TABLE D4.3                   OONCNTRTIOSOFGAMVMABEiTFERS INORNNGV~ATBR SAANRE (X)LLB~ED IN11-E\IOM1Ya UUCGEAlNS~C 2010 FIRLLS INLNTS CF RJI/UTER+/- 2 SGvA SIC        s-Ic QaLECT1QN               Ml-54  0>58   Fe-59   CD-6)   7n658 Z-9  W95-    031 Cs-134  (33137 Ba-140  La-140 RERCQD I
16C2 12MOxe          C2M2ia1i        <3     <3     <6      <2        <5  <4   <3      <5                   <17    <2 03TJ2910        <3     <1     <7      <3        <5  <4   <4      <3   <3      <2      <12    <2 033Y2D1O        <3     <3     <5      <3        <4  <3   <2      <3   <2      <3      <11    <2 04/27/2910      <4     <3     <9      <3        <8  <5   <4      <4   <5      <4      <11    <2 OM/201O 6O1U/291O      <2     <2     <6      <3        <5  <7   <4      <7   <4      <3      < 19   <4 062Y291         <4     <3     <8      <3        <8  <3   <3      <6   <4      <3      < 14   <2 CBM20a10        <4     <2     <7      <3        <4  <7   <4      <8   <4      <3      < 16   <3 c8'a2010        <3     <2     <2      <2        <3  <5   <3      <4   <3      <3      <12    <1 C928/2010       09W2910         <3     <2      <7     <3        <7  <4   <4      <4   <4      <3      < 14   <2 llC2/20io       11AC2'12o1      <3     <4     <9      <3        <5  <8   <2      <5   <3      <4      <19    <1 11/29291o       llrR2)1O        <5     <4      <5     <4        <6  <8   <3      <4   <5      <3      < 14   <3 1227/2010       <3     <3      <5     <2        <4  <6   <2      <6   <3      <2      <16    <1 LVAN D-4 S                                                        " ql

TABLE 0-11.1 CONCENTRATIONS OF GROSS BETA IN AIR PARTICULATE SAMPLES COLLECTED IN THE VICINITY OF LIMERICK GENERATING STATION, 2010 RESULTS IN UNITS OF E-3 PCI/CU METER +/-2 SIGMA COLLECTION                   11IS2 PERIOD 12/28/09  -01/04/10          17   +/-  4 01/04/10  -01/11/10          17   +/-  4 01/11/10  -01/18/10          37   +/-  5 01/18/10  -01/26/10          18   +/-  4 01/26/10  -02/01/10          22   +/-  4 02/01/10  -02/08/10          24   +/-  4 02/08/10  -02/15/10          17   +/-  4 02/15/10  -02/22/10          12   +/-  4 02/22/10  -03/01/10           7   +/-   3 03/01/10  -03/08/10          22   +/-  4 03/08/10  -03/15/10          20   +/-  4 03/15/10  -03/22/10          27   +/- 4 03/22/10  -03/29/10          22   +/- 4 03/29/10  -04/05/10          13   +/- 3 04/05/10  -04/12/10          27   +/- 4 04/12/10  -04/19/10          19   +/- 4 04/19/10  -04/26/10          20   +/-   4 04/26/10  -05/03/10          19   +/-   4 05/03/10  -05/10/10          17   +/-   4 05/10/10  -05/17/10          15   +/-   4 05/17/10  -05/24/10          19   +/-   4 05/24/10  -06/01/10          16   +/- 4 06/01/10  -06/07/10          22   +/-   4 06/07/10  -06/14/10          17   +/-  4 06/14/10  -06/21/10          21   +/-  4 06/21/10  -06/28/10          28   +/-  4 06/28/10  -07/06/10          19   +/-   3 07/06/10  -07/12/10          31   +/-   5 07/12/10  -07/19/10          25   +/-  4 07/19/10  -07/26/10          29   +/-  4 07/26/10  -08/02/10          20   +/-  4 08/02/10  -08/09/10          23   +/-  4 08/09/10   -08/16/10         31   +/-  4 08/16/10  -08/23/10          25   +/-  4 08/23/10  -08/30/10          20   +/-  4 08/30/10  -09/06/10          29   +/-  4 09/06/10  -09/13/10          26   +/-  4 09/13/10  -09/20/10          25   +/-   5 09/20/10  -09/27/10          22   +/- 4 09/27/10  -10/04/10          12   +/-  4 10/04/10  -10/11/10          16   +/-  4 10/11/10  -10/18/10          25   +/-  4 10/18/10  -10/25/10          23   +/-  4 10/25/10   -11/01/10         12   +/-  4 11/01/10  -11/08/10          12   +/- 3 11/08/10  -11/15/10          24   +/-  4 11/15/10   -11/22/10         35   +/-  4 11/22/10   -11/29/10         30   +/-  4 11/29/10   -12/06/10         13   +/-  4 12/06/10  -12/13/10          17   +/-  4 12/13/10  -12/20/10          25   +/- 4 12/20/10   -12/27/10         15   +/- 4 12/27/10   -01/03/11         33   +/- 4 M EAN                      21   +/- 13 D-5

TABLE D-II.2        CONCENTRATIONS OF GAMMA EMITTERS IN AIR PARTICULATE SAMPLES COLLECTED INTHE VICINITY OF LIMERICK GENERATING STATION, 2010 RESULTS IN UNITS OF E-3 PCI/CU METER +/- 2 SIGMA STC         COLLECTION             Be-7     Mn-54     Co-58     Co-E50  Cs-134   Cs-137 PERIOD 11S2 12/28/2009   -  03/29/2010 83  +/- 13    < 0.5     < 0.6      < 0. 3 <0.7      <0.5 03/29/2010   -  06/28/2010 98  +/- 16    < 0.8     < 1.0      < 0. 8 <0.8      < 1.2 06/28/2010   -  09/27/2010 88  +/- 16    < 0.9     < 1.0      < 0. 4 <0.8      <0.5 09/27/2010   -  01/03/2010 63  +/- 13    < 0.8     < 0.9      < 0. 4 <0.9      < 0.6 WVEAN                83 +/- 29       -         -          -
D-6

TABLE D-Ill. 1 CONCENTRATIONS OF 1-131 BY CHEMICAL SEPARATION AND GAMMA EMITTERS IN MILK SAMPLES COLLECTED INTHE VICINITY OF LIMERICK GENERATING STATION, 2010 RESULTS IN UNITS OF PCI/LITER +/- 2 SIGMA STC COLLECTION    1-131        K-40      Cs-134      Cs-137   Ba-140       La-140 PERIOD 19B1  01/12/10      < 0.3 1431  +/-  109  <3           <4      < 26         <5 04/06/10
* 0.2 1385  +/-  112  <3           <4      <13          <3 07/13/10      < 0.3 1497  +/-  118  <3           <2      <16          <3 10/05/10      < 0.3 1513  +/-  109  <4           <4      < 29         <5 MEAN               1457 +/- 119 10F4  01/12/10      < 0.3 1389  +/-  107  <2           <3      <16          <8 04/06/10
* 0.2 1350  +/-  100  <3           <3      <19          <6 07/13/10      < 0.2 1426  +/-  108  <4           <4      < 22         <4 10/05/10      < 0.3 1393  +/-  101  <5           <4      < 39         <6 MEAN               1389 +/- 62 25C1  01/12/10
* 0.2 1317  +/-  109  <4           <4      < 16         <2 04/06/10
* 0.2 1380  +/-  111  <3           <4      < 18         <4 07/13/10      < 0.3 1417  +/-  109  <4           <3      <17          <3 10/05/10     < 0.3  1380  +/-  106  <3           <3      < 35         <3 MEAN               1374 +/- 83 D-7

FIGURE D-1 COMPARISON OF MONTHLY TOTAL GROSS BETA CONCENTRATIONS IN DRINKING WATER SAMPLES SPLIT BETWEEN ENVAND TBE, 2010 10 9
8 7
6 1~
a,
'U 5
C-,
0.
4 3
2 1
0 Jan    Feb   Mar  Apr  May    Jun     Jul Aug Sep  Oct    Nov De(
MONTH D-8 b

             )
                                                         ,t"    I FIGURE D-2 COMPARISON OF WEEKLY GROSS BETA CONCENTRATIONS IN AIR PARTICULATE SAMPLES COLLECTED FROM LGS COLLOCATED LOCATIONS 11S1 AND 11S2, 2010 50 40 30 20 lO 10 1   4   7  10  13  16  19 22     25 28  31 34 37  40     43   46 49 52 WEEK NO.
D-9

Intentionally Left Blank D-IO

APPENDIX E INTER-LABORATORY COMPARISON PROGRAM

TABLE E-1         ANALYTICS ENVIRONMENTAL RADIOACTIVITY CROSS CHECK PROGRAM TELEDYNE BROWN ENGINEERING, 2010 (PAGE 1 OF 2)
Identification                                 Reported   Known      Ratio (c)
Month/Year     Number         Matrix    Nuclide         Units Value (a) Value (b) TBE/Analytics Evaluation (d)
March 2010     E6978-396      Milk      Sr-89           pCi/L   89.3      92.8        0.96           A Sr-90           pCi/L   13.8      12.7        1.09           A E6979-396      Milk      1-131           pCi/L   65.2      74.0        0.88           A Ce-141          pCi/L   241       261         0.92           A Cr-51           pCi/L   388       361         1.07           A Cs-1 34         pCi/L    157      178         0.88           A Cs-137          pCi/L    150      158         0.95           A Co-58           pCi/L    143      143         1.00           A Mn-54           pCi/L   202       207         0.98           A Fe-59           pCi/L    146      137         1.07           A Zn-65           pCi/L   247       254         0.97           A Co-60           pCi/L    177      183         0.97           A E6981-396      AP        Ce-141           pCi    211       185         1.14           A Cr-51            pCi    304       255         1.19           A Cs-1 34          pCi     142      125         1.14           A Cs-137           pCi     131      ill         1.18           A Co-58            pCi     119      101         1.18           A Mn-54            pCi     162      146         1.11           A Fe-59            pCi     110       97         1.14           A Zn-65            pCi    217       179         1.21           W Co-60            pCi     145      129         1.12           A E6980-396      Charcoal   1-131           pCi    80.2      85.6        0.94           A June 2010      E7132-396      Milk      Sr-89           pCi/L   82.0      93.4        0.88           A Sr-90           pCi/L   15.8      16.7        0.95           A E7133-396      Milk       1-131          pCi/L   83.5      96.9        0.86           A Ce-141          pCi/L    107       110        0.97           A Cr-51           pCi/L   325       339         0.96           A Cs-134          pCi/L    114       126        0.90           A Cs-137          pCi/L    144       150        0.96           A Co-58           pCi/L   92.3       101        0.91           A Mn-54           pCi/L    165       169        0.98           A Fe-59           pCi/L    121       119        1.02           A Zn-65           pCi/L    197      206         0.96           A Co-60           pCi/L    190       197        0.96           A E7135-396      AP        Ce-141           pCi    88.4      91.6        0.97           A Cr-51            pCi    292       282         1.04           A Cs-134           pCi     101       105        0.96           A Cs-137           pCi     132       125        1.06           A Co-58            pCi    87.3      84.0        1.04           A Mn-54           pCi     150       140        1.07           A Fe-59           pCi     105      98.6        1.06           A Zn-65            pCi     168       171        0.98           A Co-60            pCi     170       163        1.04           A E7134-396      Charcoal   1-131           pCi    76.4      79.9        0.96           A September 2010 E7229-396      Milk      Sr-89           pCi/L   85.0      92.8        0.92           A Sr-90           pCi/L   12.6      14.7        0.86           A E-1

TABLE E-1                    ANALYTICS ENVIRONMENTAL RADIOACTIVITY CROSS CHECK PROGRAM TELEDYNE BROWN ENGINEERING, 2010 (PAGE 2 OF 2)
Identification                                                     Reported         Known              Ratio (c)
Month/Year              Number                    Matrix       Nuclide          Units       Value (a)     Value (b)        TBE/Analytics Evaluation (d)
September 2010 E7230-396                          Milk         1-131            pCi/L         80.2            94.1               0.85         A Ce-141           pCi/L          130             130               1.00         A Cr-51            pCi/L         235             234                1.00         A Cs-1 34          pCi/L         83.2            93.0               0.89         A Cs-1 37          pCi/L         95.1            94.5               1.01         A         4 Co-58            pCi/L         77.3            73.7               1.05         A Mn-54            pCi/L          121             119               1.02         A Fe-59            pCi/L         96.4            91.1               1.06         A Zn-65            pCi/L         216             204                1.06         A Co-60            pCi/L          172             171               1.01         A E7232-396                 AP           Ce-141            pCi           122             119               1.03         A Cr-51             pCi          228             214                1.07         A Cs-134            pCi          79.9            85.3               0.94         A Cs-137            pCi          93.8            86.7               1.08         A Co-58             pCi          71.5            67.6               1.06         A Mn-54             pCi           113             110               1.03         A Fe-59             pCi          73.8            83.6               0.88         A Zn-65             pCi           186             187               0.99         A Co-60             pCi           163             157               1.04         A E7231-396                 Charcoal     1-131            pCi/L         62.3            59.9               1.04         A December 2010           E7375-396                 Milk         Sr-89            pCi/L         92.7            98.0               0.95         A Sr-90            pCi/L         13.5            13.5               1.00         A E7376-396                 Milk         1-131            pCi/L         87.9            96.9               0.91         A Ce-141           pCi/L     not provided by Analytics for this study Cr-51            pCi/L         389             456                0.85         A Cs-134           pCi/L          137             157               0.87         A Cs-137           pCi/L          172             186               0.92         A Co-58            pCi/L         84.3            90.2               0.93         A Mn-54            pCi/L          120             120               1.00         A Fe-59            pCi/L          134             131               1.02         A Zn-65            pCi/L          162             174               0.93         A Co-60            pCi/L         284             301                0.94         A E7378-396                AP            Ce-141            pCi      not provided by Analytics for this study Cr-51             pCi          387             365                1.06         A Cs-134            pCi           135            126                1.07         A Cs-137            pCi           157            149                1.05         A Co-58             pCi          73.6            72.3               1.02         A Mn-54             pCi          88.7             96                0.92         A Fe-59             pCi           127            105                1.21         W Zn-65             pCi           151            139                1.09         A Co-60             pCi          249             241                1.03         A December 2010           E7377-396                 Charcoal     1-131             pCi          79.6            84.2               0.95         A (a) Teledyne Brown Engineeringreported result.
(b) The Analytics known value is equal to 100% of the parameterpresent in the standardas determined by gravimetric and/or volumetric measurements made during standardpreparation.
(c) Ratio of Teledyne Brown Engineeringto Analytics results.
(d) Analytics evaluation based on TBE internal QC limits: A= Acceptable. Reported result falls within ratio limits of 0.80-1.20.
W-Acceptable with warning. Reported result falls within 0.70-0.80 or 1.20-1.30. N = Not Acceptable. Reported result falls outside the ratio limits of< 0.70 and > 1.30.
E-2

TABLE E-2                       ERA ENVIRONMENTAL RADIOACTIVITY CROSS CHECK PROGRAM TELEDYNE BROWN ENGINEERING, 2010 (PAGE 1 OF 1)
Identification                                                        Reported        Known Month/Year              Number                 Media          Nuclide              Units      Value (a)     Value (b)      Control Limits  Evaluation (c)
May 2010                RAD-81                 Water          Sr-89                pCi/L         64.4          60.4          48.6   - 68.2      A Sr-90                pCi/L         37.8          41.3          30.4   - 47.4      A Ba-1 33              pCi/L         66.4          65.9          54.9   - 72.5      A Cs-1 34              pCi/L        66.43           71.6         58.4   - 78.8      A Cs-1 37              pCi/L        137.33          146           131   - 163       A Co-60                pCi/L        83.33           84.5         76.0   - 95.3      A Zn-65                pCi/L          177           186           167   -219        A G r-A                pCi/L        26.37          32.9          16.9   - 42.6      A G r- B               pCi/L        28.77          37.5          24.7   - 45.0      A 1-131                pCi/L        26.27           26.4         21.9   -31.1       A H-3                  pCi/L        12967         12400        10800    -13600      A November2010            RAD-83                 Water          Sr-89                pCi/L         77.8           68.5         55.8   - 76.7    Note 1 Sr-90                pCi/L         39.3          43.0          31.7   - 49.3      A Ba-1 33              pCi/L         70.3          68.9          57.5   - 75.8      A Cs-1 34              pCi/L         39.9          43.2          34.5  - 47.5       A Cs-1 37              pCi/L          117           123           111   - 138       A Co-60                pCi/L         53.5          53.4          48.1   - 61.3      A Zn-65                pCi/L         11.0           102          91.8- 122        Note 2 G r-A                pCi/L         35.1          42.3          21.9 -53.7         A Gr-8                 pCi/L         35.5          36.6          24.0 - 44.2        A 1-131                pCilL         27.9          27.5          22.9 - 32.3        A H-3                  pCi/L        13233         12900        11200 - 14200        A (1)  Sr-89 rBE to known ratio oft. 14 fell within acceptable range oft 20%. No action required.NCR 10-09 (2) Zn-65 result of I I1 was incorrectly reported as 11.0. No acton required. NCR 10-09 (a)  Teledyne Brown Engineering reported result.
(b)  The ERA known value is equal to 100% of the parameter present in the standardas determined by gravimetric and/or volumetric m eas urements made during standardpreparation.
(c) ERA evaluation:A=acceptable. Reported result falls within the Warning Limits. NA=not acceptable. Reported result falls outside of the Control Limits. CE=check for Error. Reported result falls within the Control Limits and outside of the Warning Limit.
E-3

TABLE E-3          DOE'S MIXED ANALYTE PERFORMANCE EVALUATION PROGRAM (MAPEP)
TELEDYNE BROWN ENGINEERING, 2010 (PAGE 1 OF2)
Identification                                    Reported   Known      Acceptance Month/Year     Number          Media     Nuclide         Units   Value (a) Value (b)      Range      Evaluation (c)
March 2010     10-MaW 22      Water      Cs-1 34         Bq/L     -0.0942                    (1)          A Cs-1 37         Bq/L       58.5     60.6       42.4 - 78.8       A Co-57           Bq/L       27.2     28.3       19.8 - 36.8       A Co-60           Bq/L     0.0226                     (1)          A H-3             Bq/L        104     90.8      63.6 - 118.0       A Mn-54           Bq(L       26.6     26.9       18.8 - 35.0       A Sr-90           Bq/L     0.1029                     (1)          A Zn-65           Bq/L       42.0     40.7       28.5 - 52.9       A 10-GrW22       Water      Gr-A            Bq/L     0.5173    0.676      0.00 - 1.352       A Gr-B            Bq/L       3.98     3.09       1.55 -4.64        A 10-MaS22       Soil       Cs-1 34        Bq/kg       665      733        513- 953          A Cs-1 37        Bq/kg       800      779       545 -1013          A Co-57          Bq/kg       508      522        365 -679          A Cow60          Bq/kg       648      622        435-809           A Mn-54          Bq/kg       893      849       594 -1104          A K-40           Bq/kg       597      559        391 -727          A Sr-90          Bq/kg       221      288        202 -374          W Zn-65          Bq/kg      -4.97                     (1)          A 10-RdF22       AP         Cs-134       Bq/sample     1.81     2.13      1.49 -2.77         A Cs-1 37      Bq/sample     1.70     1.53      1.07-1.99          A Co-57        Bq/sa mple  0.0056                     (1)          A Co-60        Bq/sample     2.65    2.473     1.731 - 3.215       A Mn-54        Bq/sample     3.70     3.02      2.11 -3.93         W Sr-90        Bq/sample   0.0523                     (1)          A Zn-65        Bq/sample  -0.0627                    (1)           A 10-GrF22       AP         Gr-A        Bq/sample    0.1533   0.0427     0.00-0.854          A Gr-B        Bq/sample     1.240     1.29      0.65 - 1.94        A 10-RdV22       Vegetation Cs-1 34     Bq/sample     4.48     4.39       3.07 - 5.71        A Cs-1 37     Bq/sa mp le   3.43     3.06       2.14 - 3.98        A Co-57       Bq/sa mple -0.0117                     (1)           A Co-60       Bq/sample     3.55     3.27       2.29 - 4.25        A Mn-54       Bq/sa mp le   0.007                    (1)           A Sr-90       Bq/sample -0.0002                      (1)           A Zn-65       Bq/sample     8.12     7.10       4.97   - 9.23      A September 2010 10-MaW 23      Water      Cs-1 34        Bq/L       27.1     31.4       22.0 - 40.8        A Cs-1 37        Bq/L       41.8     44.2       30.9 - 57.5        A Co-57          Bq/L       33.2     36.0       25.2 - 46.8        A Co-60          Bq/L       26.5     28.3       19.8 -36.8         A H-3            Bq/L        500    453.4     317.4 -589.4         A Mn-54          Bq/L      0.024                     (1)           A Sr-90          Bq/L       8.10      8.3       5.8 -10.8          A Zn-65          Bq/L       30.8     31.0       21.7 -40.3         A 10-GrW23       Water      Gr-A           Bq/L       2.36     1.92       0.58 - 3.26        A Gr-B           Bq/L       6.37     4.39       2.20 - 6.59        A E-4

TAB LE E-3                   DOE'S MIXED ANALYTE PERFORMANCE EVALUATION PROGRAM (MAPEP)
TELEDYNE BROWN ENGINEERING, 2010 (PAGE 2 OF 2)
Identification                                               Reported       Known        Acceptance Month/Year               Number            Media       Nuclide              Units     Value (a)     Value (b)         Range      Evaluation (c)
September 2010           10-MaS23          Soil        Cs-1 34             Bq/kg          837         940          658 - 1222          A Cs-1 37             Bq/kg          680         670           469 - 871         -A Co-57               Bq/kg         2.78                            (1)           A Co-60               Bq/kg          350         343           240 - 446          A Mn-54               Bq/kg          853         820          574 - 1066          A K-40                Bq/kg          721         699           489 - 909          A Sr-90               Bq/kg         2.24                            (1)           A Zn-65               Bq/kg          287         265            186 -345          A 10-RdF23          AP          Cs-1 34          Bq/sample        2.31         2.98         2.09 - 3.87        W Cs-1 37          Bq/sample       -0.025                           (1)           A Co-57            Bq/sample        3.64         4.08          2.86 - 5.38        A Co-60            Bq/sample        2.81         2.92          2.04 - 3.80        A Mn-54            Bq/sample        3.19         3.18          2.23-4.13          A Sr-90            Bq/sample        1.01         1.01         0.71 - 1.31         A Zn-65            Bq/sample       0.0310                           (1)           A 10-GrF23          AP          Gr-A             Bq/sample       0.004                            (1)           A G r- B           Bq/sample       0.473         0.50          0.25  - 0.75       A 10-RdV23          Vegetation Cs-1 34           Bq/sample        4.90         4.79         3.35 - 6.23         A Cs-1 37          Bq/sample        6.78         5.88         4.12 - 7.64         A Co-57            Bq/sample        10.2         8.27         5.79 - 1 0.75      W Co-60            Bq/sample        0.00                            (1)           A Mn-54            Bq/sample        7.36        6.287        4.401 - 8.173        A Sr-90            Bq/sample        2.53         2.63          1.84 - 3.42        A Zn-65            Bq/sa mp le      6.40       5.3900          3.77 - 7.01        A (1) False positive test.
(a) Teledyne Brown Engineering reported result (b) The MAPEP known value is equal to 100% of the parameterpresent in the standard as determined by gravimetricand/or volumetric measurements made during standardpreparation.
(c) DOEIMAPEP evaluation: A=acceptable, W=acceptablewith warning, N=not acceptable.
E-5

8 TABLE E-4                        ERA STATISTICAL 

==SUMMARY==
PROFICIENCY TESTING PROGRAM ENVIRONMENTAL, INC., 2010 (Page l of 1)
Concentration (pCiL)
Lab Code           Date           Analysis              Laboratory              ERA                  Control Resultb              Resultc                Limits            Acceptance STW -1205          04/05110       Sr-89                    63.0   +/- 5.7              60.4          48.6  -68.2             Pass STW -1205          04/05/10       Sr-90                    37.4   +/- 2.4              41.3          30.4  -47.4             Pass STW -1206          04/05/10       Ba-1 33                  63.6   +/- 3.3              65.9          54.9  - 72.5            Pass STW -1206          04/05/10       Co-60                    83.3   +/- 2.9              84.5          76.0  -95.3             Pass STW -1206          04/05/10       Cs-1 34                  71.0   +/- 3.4              71.6          58.4  -78.8             Pass STW -1206          04105/10       Cs-1 37                 145.5   +/- 5.1            146.0         131.0   -163.0            Pass STW -1206          04/05/10       Zn-65                   194.9   +/- 7.8            186.0         167.0   -219.0            Pass STW-1207           04/05/10       Gr. Alpha                26.5 +/- 1.7                32.9          16.9 -42.6              Pass STW -1207          04/05/10       Gr. Beta                 34.5 +/- 1.6                37.5          24.7 -45.0              Pass STW-1208           04/05/10       1-131                    22.7 +/- 0.8                26.4          21.9 -31.1              Pass STW-1209           04/05/10       Ra-226                   15.2   +/- 0.7              14.6          10.9  - 16.8            Pass STW -1209          04/05/10       Ra-228                   15.6  +/- 1.8               15.1          10.1  - 18.3            Pass STW-1209           04/05/10       Uranium                  59.5  +/- 0.7               62.3          50.7  -69.1             Pass STW-1210           04/05/10       H-3                    12955   +/- 332          12400.0         10800    - 13600           Pass STW-1224           10/04/10       Sr-89                    65.3 +/- 5.7                68.5         55.8 - 76.7              Pass STW -1224          10/04/10       Sr-90                    39.9 +/- 2.3               43.0          31.7 -49.3               Pass STW-1225           10/04/10       Ba-1 33                  67.2  +/- 4.3              68.9          57.5 - 75.8              Pass STW-1225           10/04/10       Co-60                    53.2  +/- 3.3              53.4          48.1 -61.3               Pass STW -1 225         10/04/10       Cs-1 34                  47.3  +/- 5.1              43.2          34.5 -47.5              Pass STW -1225          10/04/10       Cs -137                 118.0  +/- 5.9             123.0        111.0 - 138.0             Pass STW -1 225         10/04/10       Zn-65                   107.0  +/- 8.7             102.0          91.8 -122.0             Pass STW-1226           10/04/10       Gr. Alpha                30.7 +/- 2.9               42.3          21.9 -53.7              Pass STW -1226          10/04/10       Gr. Beta                 32.7 +/- 0.8               36.6          24.0 -44.2              Pass STW-1227           10/04/10       1-131                    28.6 +/- 1.1               27.5          22.9 -32.3              Pass STW -1228          10/04/10       Ra-226                   11.8  +/- 0.6              11.4            8.5 -13.2             Pass STW -1228          10/04/10       Ra-228                   12.0  +/- 1.8                9.9           6.4 -12.3             Pass STW -1 228         10/04/10      Uranium                   34.8  +/- 0.4              36.8          29.8  -41.0             Pass STW -1 229         10/04/10      H-3                     13682   +/- 352          12900.0        11200    - 14200           Pass a Results obtained by Environmental, Inc., Midwest Laboratory as a participant in the crosscheck program for proficiency testing in drinking water conducted by Environmental Resources Associates (ERA).
b Unless otherwise indicated, the laboratory result is given as the mean +/- standard deviation for three determinations.
c Results are presented as the known values, expected laboratory precision (1 sigma, 1 determination) and control limits as provided by ERA.
E-6

TABLE E-5           DOE'S MIXED ANALYTE PERFORMANCE EVALUATION PROGRAM (MAPEP)a ENVIRONMENTAL, INC., 2010 (Page 1 of 3)
Concentration b Laboratory           Known              Control Lab Code  c Date        Analysis       Result            Activity            Limits d      Acceptance STVE-1199   03/01/10    Co-57        0.01 +/- 0.03           0.00                              Pass STVE-1199   03/01/10    Co-60        3.39 +/-0.12            3.27            2.29 -4.25        Pass STVE-1199   03/01/10    Cs-1 34      4.74 +/- 0.15           4.39            3.07 -5.71        Pass STVE-1199   03/01/10    Cs-1 37      3.32 +/- 0.17           3.06            2.14 -3.98        Pass STVE-1199   03/01/10    Mn-54        0.01 +/- 0.05           0.00                              Pass STVE-1 199  03/01/10    Zn-65        8.03 +/- 0.33           7.10            4.97 -9.23        Pass STW-1200    03/01/10    Gr. Alpha    0.40 +/- 0.05           0.68            0.00 -1.35        Pass STW-1200    03/01/10    Gr. Beta     3.03 +/- 0.07           3.09            1.55 -4.64        Pass STW -1201   03/01/10    Am-241       1.05 +/- 0.08           1.30            0.91 -1.69        Pass STW -1201   03/01/10    Co-57       28.90 +/- 0.40          28.30           19.80 -36.80       Pass STW -1201   03/01/10    Co-60        0.06 +/- 0.05           0.00                              Pass STW -1201   03/01/1.0   Cs-134      -0.03 +/- 0.09           0.00                              Pass STW -1201   03/01/10    Cs-137      60.60 +/- 0.60          60.60           42.40 -78.80       Pass STW -1201   03/01/10    Fe-55        3.00 +/- 14.40          0.00                              Pass STW -1201   03/01/10    H-3         93.20 +/- 18.30         90.80           63.60 -118.00      Pass STW -1201   03/01/10    Mn-54       27.80 +/- 0.40          26.90           18.80 -35.00       Pass STW-1201    03/01/10    Ni-63       49.10 +/- 3.50          59.90           41.90 -77.90       Pass STW-1201    03/01/10    Sr-90       -0.10 +/- 0.60           0.00                              Pass STW -1201   03/01/10    Tc-99        0.50 +/- 0.50           0.00                              Pass STW -1201   03/01/10    U-233/4      1.21 +/- 0.05           1.22            0.85 -1.59        Pass STW-1201    03/01/10    U-238        1.20 +/- 0.05           1.25            0.88 -1.63        Pass STW-1201    03/01/10    Zn-65       42.70 +/- 0.80          40.70           28.50 -52.90       Pass STSO-1 202  03/01/10    Co-57      520.00 +/- 10.80        522.00          365.00  -679.00     Pass STSO-1 202  03/01/10    Co-60      599.10 +/-2.80          622.00          435.00  - 809.00    Pass STSO-1 202  03/01/10    Cs-1 34    666.10 +/- 4.70         733.00          513.00  -953.00     Pass STSO-1 202  03/01/10    Cs -137    774.40 +/- 4.50         779.00          545.00  - 1013.00   Pass STSO-1 202  03/01/10    K-40       562.00 +/- 15.30        559.00          391.00  -727.00     Pass STSO-1 202  03/01/10    Mn-54      866.20 +/- 4.60         849.00          594.00  - 1104.00   Pass STSO-1 202  03/01/10    Sr-90      225.50 +/- 11.80        288.00          202.00  - 374.00    Pass STSO-1 202  03/01/10    U-233/4     59.90 +/- 2.50          60.00           42.00 -78.00       Pass STSO-1 202  03/01/10    U-238       62.10 +/- 2.60          64.00           45.00 - 83.00      Pass STSO-1 202  03/01/10    Zn-65       -1.23 +/- 1.96           0.00                              Pass STAP-1 203  03/01/10    Am-241       0.10 +/- 0.01           0.15            0.10 -0.19        Pass STAP-1 203  03/01/10    Co-57        0.01 +/- 0.02           0.00                              Pass STAP-1203   03/01/10    Co-60        2.63 +/- 0.19           2.47            1.73  -3.22       Pass STAP-1203   03/01/10    Cs-1 34      2.21 +/- 0.34           2.13            1.49  -2.77       Pass STAP-1 203  03/01/10    Cs -137      1.66 +/- 0.22           1.53            1.07  -1.99       Pass STAP-1 203  03/01/10    Mn-54        3.42 +/- 0.26           3.02            2.11  -3.93       Pass STAP-1 203  03/01/10    Sr-90        0.02 +/- 0.06           0.00                              Pass STAP-1 203  03/01/10    Zn-65       -0.05 +/- 0.11           0.00                              Pass E-7

TABLE E-5       DOE'S MIXED ANALYTE PERFORMANCE EVALUATION PROGRAM (MAPEP)a ENVIRONMENTAL, INC., 2010 (Page 2 of 3)
Concentration b Laboratory           Known            Control Lab Code c Date       Analysis          Result             Activity         Limits d     Acceptance STAP-1 204 03/01/10   Gr. Alpha       0.13 +/-0.03             043          0.00 -0.85        Pass STAP-1 204 03/01/10   Gr. Beta        1.46 +/- 0.07            1.29         0.65 -1.94        Pass STW-1211   08/01/10   Am-241          0.02  +/- 0.02           0.00                           Pass STW-1211   08/01/10   Co-57          36.40  +/- 4.80          36.00        25.20  -46.80      Pass STW-1211   08/01/10   Co-60          28.30  +/- 1.00          28.30        19.80  -36.80      Pass STW-1211   08/01/10   Cs-1 34        29.30  +/- 2.10          31.40        22.00  -40.80      Pass STW-1211   08/01/10   Cs-1 37        44.60  +/- 1.80          44.20        30.90  -57.50      Pass STW-1211   08/01/10   Fe-55          48.50  +/- 20.10         60.20        42.10 -78.30      Pass STW-1211   08/01/10   H-3           503.60  +/- 12.80        453.40       317.40 - 589.40    Pass STW-1211   08/01/10   K-40           38.50  +/- 2.50          38.90        27.20 - 50.60     Pass STW-1211   08/01/10   Mn-54           0.10  +/- 0.30           0.00                          Pass STW-1211   08/01/10   Ni-63          49.30  +/- 3.10          56.10        39.30  -72.90     Pass STW-1211   08/01/10   Pu-238          1.49  +/- 0.15           1.81         1.27  -2.35      Pass STW-1211   08/01/10   Pu-239/40       1.20  +/- 0.10           1.35         0.95  -1.76      Pass STW-1211   08/01/10   Sr-90           9.20  +/- 1.30           8.30         5.80  -10.80     Pass STW-1211   08/01/10   Tc-99          28.10  +/- 0.90          33.60        23.50  -43.70     Pass STW-1211   08/01/10   U-233/4         2.04  +/- 0.14           2.01         1.41  -2.61      Pass STW-1211   08/01/10   U-238           2.05  +/- 0.14           2.07         1.45  -2.69      Pass STW-1211   08/01/10   Zn-65          32.80  +/- 3.00          31.00        21.70 -40.30      Pass STW-1212   08/01/10   Gr. Alpha       1.54 +/- 0.09            1.92         0.58 -3.26       Pass STW-1212   08/01/10   Gr. Beta        4.13 +/- 0.15            4.39         2.20 -6.59       Pass STVE-1 213 08/01/10   Co-57           9.60  +/- 0.54           8.27         5.79 -10.75      Pass STVE-1 213 08/01/10   Co-60           0.05  +/- 0.08           0.00                          Pass STVE-1 213 08/01/10   Cs-1 34         4.83  +/- 0.26          4.79          3.35 -6.23       Pass STVE-1 213 08/01/10   Cs-1 37         6.45  +/- 0.66           5.88         4.12 -7.64       Pass STVE-1 213 08/01/10   Mn-54           7.12  +/- 0.66           629          4.40 -8.17       Pass STVE-1 213 08/01/10   Zn-65           6.05  +/- 0.74           5.39         3.77 -7.01       Pass STSO-1 214 08/01/10   Co-57           0.10  +/- 1.60           0.00                          Pass STSO-1 214 08/01/10   Co-60         370.00  +/- 6.00         343.00       240.00 - 446.00    Pass STSO-1 214 08/01/10   Cs-1 34      1005.00  +/- 21.00        940.00       658.00 - 1222.00   Pass STSO-1 214 08/01/10   Cs-1 37       755.00  +/- 15.00        670.00       469.00 -871.00     Pass STSO-1 214 08/01/10   K-40          783.00  +/- 54.00        699.00       489.00 - 909.00    Pass STSO-1 214 08/01/10   Mn-54         942.00  +/- 15.00        820.00       574.00 - 1066.00   Pass STSO-1 214 08/01/10   Pu-238         69.20  +/- 6.20          64.00        45.00 - 83.00     Pass STSO-1 214 08/01/10   Pu-239/40      76.50  +/- 6.20          71.00        50.00 -92.00      Pass STSO-1 214 08/01/10   Sr-90           3.50  +/- 8.00           0.00                          Pass STSO-1 214 08/01/10   U-233/4        76.50  +/- 6.20          71.00        50.00 -92.00      Pass STSO-1 214 08/01/10   U-238         271.40  +/- 9.00         289.00       202.00 -376.00     Pass STSO-1 214 08/01/10   Zn-65         310.00  +/- 18.00        265.00       186.00 - 345.00    Pass E-8

TABLE E-5              DOE'S MIXED ANALYTE PERFORMANCE EVALUATION PROGRAM (MAPEP)a ENVIRONMENTAL, INC., 2010 (Page 3 of 3)
Concentration b Laboratory            Known              Control Lab Code  c  Date        Analysis               Result             Activity           Limits d          Acceptance STAP-1 215   08/01/10     Co-57              4.47  +/- 021            4.08             2.86 -5.30            Pass STAP-1 215   08/01/10     Co-60              3.15  +/- 0.30            2.92            2.04 -3.80            Pass STAP-1 215   08/01/10     Cs-1 34            3.03  +/- 0.17           2.98             2.09 -3.87            Pass STAP-1 215   08/01/10     Cs-1 37            0.01  +/- 0.05           0.00                                   Pass STAP-1 215   08/01/10     Mn-54              3.69  +/- 0.39            3.18            2.23 -4.13            Pass STAP-1 215   08/01/10     Sr-90               1.00 +/- 0.12            1.01            0.71 -1.31            Pass STAP-1 215   08/01/10     Zn-65              0.03  +/- 0.15            0.00                                  Pass STAP-1216    08/01/10     Gr. Alpha          0.01 +/- 0.01            0.00                                   Pass STAP-1216    08/01/10     Gr. Beta           0.54 +/- 0.05             0.50            0.25 -0.75            Pass a Results obtainedby Environmental, Inc., Midwest Laboratory as a participantin the Department of Energy's Mixed Analyte Performance EvaluationProgram, Idaho Operations office, Idaho Falls, Idaho 0 Results are reported in units of Bq/kg (soil), Bq/L (water) or Bq/total sample (filters, vegetation).
Laboratory codes as follows: STW (water), STAP (air filter), STSO (soil), STVE (vegetation).
d MAPEP results are presented as the known values and expected laboratoryprecision (1 sigma, I determination)and control limits as defined by the MAPEP.
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Intentionally Left Blank E - 10

APPENDIX F ANNUAL RADIOLOGICAL GROUNDWATER PROTECTION PROGRAM REPORT (ARGPPR)

Docket No:  50 - 352 50 - 353 LIMERICK GENERATING STATION UNITS 1 and 2 Annual Radiological Groundwater Protection Program Report 1 January Through 31 December 2010 Prepared By Teledyne Brown Engineering Environmental Services Exeln.
Nuclear Limerick Generating Station Sanatoga, PA 19464 April 2011

Table Of Contents I. Sum m ary and Conclusions ...........................................................................................                   1 I1. Introduction ........................................................................................................................ 3 A. O bjectives of the RG PP ...................................................................................                    3 B. Im plem entation of the Objectives .....................................................................                        3 C. Program Description .........................................................................................                   4 D. Characteristics of Tritium (H-3) .......................................................................                        5 I1l. Program Description .....................................................................................................             6 A. Sam ple Analysis ................................................................................................               6 B. Data Interpretation ...........................................................................................                 6 C. Background Analysis .........................................................................................                   7
: 1. Background Concentrations of Tritium ..................................................                                 8 IV. Results and Discussions ...........................................................................................                   10 A. Groundwater Results ......................................................................................                     10 B. Surface W ater Results ....................................................................................                    11 C. Drinking W ater W ell Survey ............................................................................                      12 D. Summary of Results - Inter-laboratory Comparison Program .......................                                               12 E. Leaks, Spills, and Releases ............................................................................                       12 F. Trends ..............................................................................................................          12 G . Investigations ..................................................................................................             13 H. Actions Taken ..................................................................................................               13 V. References ......................................................................................................................      13

Appendices Appendix A    Location Designation Tables Table A-1    Radiological Groundwater Protection Program - Sampling Locations for the Limerick Generating Station, 2010 Figures Figure 1     Routine Well Water and Surface Water Sample Locations for the Radiological Groundwater Protection Program, Limerick Generating Station, 2010 Appendix B    Data Tables Tables Table B-1.1   Concentrations of Tritium, Strontium-90, Gross Alpha and Gross Beta in Well Water Samples Collected as Part of the Radiological Groundwater Protection Program, Limerick Generating Station, 2010.
Table B-1.2   Concentrations of Gamma Emitters in Well Water Samples Collected as Part of the Radiological Groundwater Protection Program, Limerick Generating Station, 2010.
Table B-1.3   Concentrations of Hard-To-Detects in Well Water Samples Collected as Part of the Radiological Groundwater Protection Program, Limerick Generating Station, 2010.
Table B-11.1  Concentrations of Tritium, Strontium-90, Gross Alpha and Gross Beta in Surface Water Samples Collected as Part of the Radiological Groundwater Protection Program, Limerick Generating Station, 2010.
Table B-11.2  Concentrations of Gamma Emitters in Surface Water Samples Collected as Part of the Radiological Groundwater Protection Program, Limerick Generating Station, 2010.
ii

I. Summary and Conclusions This report on the Radiological Groundwater Protection Program (RGPP) conducted for the Limerick Generating Station (LGS) by Exelon Nuclear covers the period 01 January 2010 through 31 December 2010. During that time period, 481 analyses were performed on 76 samples from 15 groundwater and 7 surface water locations collected from the environment, both on and off station property in 2010.
There were no spills that could affect the ground water monitoring program in 2010.
Tritium was not detected in any of the groundwater or surface water samples at concentrations greater than the United States Environmental Protection Agency (USEPA) drinking water standard (and the Nuclear Regulatory Commission Reporting Limit) of 20,000 pCi/L. Low levels of tritium were detected at two of the 15 groundwater monitoring locations. The tritium concentrations ranged from 238 to 1,320 pCi/L.
Strontium-90 was not detected in either the groundwater or surface water samples.
Gross Alpha and Gross Beta analyses in the dissolved and suspended fractions performed on groundwater surface water samples during the second sampling in 2010. Gross Alpha (dissolved) was detected at 5 of 15 groundwater locations.
The concentrations ranged from 2.9 to 6.2 pCi/L. Gross Alpha (suspended) was detected at 8 of 15 groundwater and 2 of 7 surface water locations. The concentrations ranged from 1.1 to 60.0 pCi/L. Gross Beta (dissolved) was detected at 14 of 15 groundwater and all 7 surface water locations. The concentrations ranged from 2.1 to 38.5 pCi/L. Gross Beta (suspended) was detected at 11 of 15 groundwater and 5 of 7 locations. The concentrations ranged from 1.7 to 124.0 pCi/L.
Gamma-emitting radionuclides associated with licensed plant operations were not detected in either groundwater or surface water samples.
Hard-To-Detect analyses were performed on a select group of groundwater locations to establish background levels. The analyses included Fe-55, Ni-63, Am-241, Cm-242, Cm-243/244, Pu-238, Pu-239/240, U-233/234, U-235 and U-238. The isotopes of U-233/234, and U-238 were detected at four of six groundwater monitoring locations. The U-233/234 concentrations ranged from 1.4 to 2.7 pCi/L and the U-238 concentrations ranged from 0.8 to 1.2 pCi/L. The levels detected are considered background.
All other hard-to-detect nuclides were not detected at concentrations greater than their respective MDCs.
1

Although no drinking water pathway is available from groundwater, the dose via the drinking water pathway was calculated at 0.08 mrem to a child (total body),
which was 1.30% of the 10 CFR 50, Appendix I dose limit.
In assessing all the data gathered for this report, it was concluded that the operation of Limerick Generating Station had no adverse radiological impact on the environment offsite of LGS.
2

II. Introduction The Limerick Generating Station (LGS), consisting of two 3458 MWt boiling water reactors owned and operated by Exelon Corporation, is located adjacent to the Schuylkill River in Montgomery County, Pennsylvania. Unit No. 1 went critical on 22 December 1984. Unit No. 2 went critical on 11 August 1989. The site is located in Piedmont countryside, transversed by numerous valleys containing small tributaries that feed into the Schuylkill River. On the eastern river bank elevation rises from approximately 110 to 300 feet mean sea level (MSL). On the western river bank elevation rises to approximately 50 feet MSL.
This report covers those analyses performed by Teledyne Brown Engineering (TBE) on samples collected in 2010.
In 2006, Exelon instituted a comprehensive program to evaluate the impact of station operations on groundwater and surface water in the vicinity of Limerick Generating Station. This evaluation involved numerous station personnel and contractor support personnel.
A.      Objective of the RGPP The long-term objectives of the RGPP are as follows:
: 1. Identify suitable locations to monitor and evaluate potential impacts from station operations before significant radiological impact to the environment and potential drinking water sources.
: 2. Understand the local hydrogeologic regime in the vicinity of the station and maintain up-to-date knowledge of flow patterns on the surface and shallow subsurface.
: 3. Perform routine water sampling and radiological analysis of water from selected locations.
: 4. Report new leaks, spills, or other detections with potential radiological significance to stakeholders in a timely manner.
: 5. Regularly assess analytical results to identify adverse trends.
: 6. Take necessary corrective actions to protect groundwater resources.
B.      Implementation of the Objectives The objectives identified have been implemented at Limerick Generating Station as discussed below:
: 1. Exelon and its consultant identified locations as described in the 2006 Phase 1 study. The Phase 1 study results and conclusions 3

were made available to state and federal regulators in station specific reports.
: 2. The Limerick Generating Station reports describe the local hydrogeologic regime. Periodically, the flow patterns on the surface and shallow subsurface are updated based on ongoing measurements.
: 3. Limerick Generating Station will continue to perform routine sampling and radiological analysis of water from selected locations.
: 4. Limerick Generating Station has implemented new procedures to identify and report new leaks, spills, or other detections with potential radiological significance in a timely manner.
: 5. Limerick Generating Station staff and consulting hydrogeologist assess analytical results on an ongoing basis to identify adverse trends.
C. Program Description Samples for the ongoing ground water monitoring program were collected for Exelon Nuclear by Normandeau Associates, Inc. (NAI). This section describes the general collection methods used to obtain environmental samples for the LGS RGPP in 2010. Sample locations can be found in Table A-i, Appendix A.
: 1. Sample Collection Groundwater and Surface Water Samples of both groundwater and surface water were collected, managed, transported and analyzed in accordance with approved procedures following EPA methods. Sample locations, sample collection frequencies and analytical frequencies were controlled in accordance with approved station procedures. Contractor and/or station personnel were trained in the collection, preservation       A management, and shipment of samples, as well as in documentation of sampling events. Analytical laboratories were subject to internal quality assurance programs, industry cross-check programs, as well as nuclear industry audits. Station personnel reviewed and evaluated all analytical data deliverables as data were received.
4

Both station personnel and an independent hydrogeologist reviewed analytical data results for adverse trends or changes to hydrogeologic conditions.
D. Characteristics of Tritium (H-3)
Tritium (chemical symbol H-3) is a radioactive isotope of hydrogen. The most common form of tritium is tritium oxide, which is also called "tritiated water." The chemical properties of tritium are essentially those of ordinary hydrogen.
Tritiated water behaves the same as ordinary water in both the environment and the body. Tritium can be taken into the body by drinking water, breathing air, eating food, or absorption through skin. Once tritium enters the body, it disperses quickly and is uniformly distributed throughout the body. Tritium is excreted primarily through urine with a clearance rate characterized by an effective biological half-life of about 14 days. Within one month or so after ingestion, essentially all tritium is cleared. Organically bound tritium (tritium that is incorporated in organic compounds) can remain in the body for a longer period.
Tritium is produced naturally in the upper atmosphere when cosmic rays strike air molecules. Tritium is also produced during nuclear weapons explosions, as a by-product in reactors producing electricity, and in special production reactors, where the isotopes lithium-7 and/or boron-10 are activated to produce tritium. Like normal water, tritiated water is colorless and odorless. Tritiated water behaves chemically and physically like non-tritiated water in the subsurface, and therefore tritiated water will travel at the same velocity as the average groundwater velocity.
Tritium has a half-life of approximately 12.3 years. It decays spontaneously to helium-3 (3 He). This radioactive decay releases a beta particle (low-energy electron). The radioactive decay of tritium is the source of the health risk from exposure to tritium. Tritium is one of the least dangerous radionuclides because it emits very weak radiation and leaves the body relatively quickly. Since tritium is almost always found as water, it goes directly into soft tissues and organs. The associated dose to these tissues is generally uniform and is dependent on the water content of the specific tissue.
5

Ill. Program Description A. Sample Analysis This section describes the general analytical methodologies used by TBE to analyze the environmental samples for radioactivity for the Limerick Generating Station RGPP in 2010.
In order to achieve the stated objectives, the current program includes the following analyses:
: 1.      Concentrations of tritium in groundwater and surface water.
: 2.      Concentrations of Gross Alpha, Dissolved and Suspended and Gross Beta, Dissolved and Suspended in groundwater and surface water.
: 3.      Concentrations of gamma emitters in groundwater and surface water.
: 4.      Concentrations of strontium in groundwater and surface water.
: 5.      Concentrations of Am-241 in groundwater.
: 6.      Concentrations of Cm-242 and Cm-243/244 in groundwater.
: 7.      Concentrations of Pu-238 and PU-239/240 in groundwater.
: 8.      Concentrations of U-233/234, U-235 and U-238 in groundwater.
: 9.      Concentrations of Fe-55 in groundwater.
: 10. Concentrations of Ni-63 in groundwater.
B. Data Interpretation The radiological data collected prior to Limerick Generating Station becoming operational were used as a baseline with which these operational data were compared. For the purpose of this report, Limerick Generating Station was considered operational at initial criticality. Several factors were important in the interpretation of the data:
: 1.      Lower Limit of Detection and Minimum Detectable Concentration The lower limit of detection (LLD) is defined as the smallest concentration of radioactive material in a sample that would yield a net count (above background) that would be detected with only a 6

5% probability of falsely concluding that a blank observation represents a "real" signal. The LLD is intended as a before the fact estimate of a system (including instrumentation, procedure and sample type) and not as an after the fact criterion for the presence of activity. All analyses were designed to achieve the required LGS detection capabilities for environmental sample analysis.
The minimum detectable concentration (MDC) is defined above with the exception that the measurement is an after the fact estimate of the presence of activity.
: 2.      Laboratory Measurements Uncertainty The estimated uncertainty in measurement of tritium in environmental samples is frequently on the order of 50% of the measurement value.
Statistically, the exact value of a measurement is expressed as a range with a stated level of confidence. The convention is to report results with a 95% level of confidence. The uncertainty comes from calibration standards, sample volume or weight measurements, sampling uncertainty and other factors. Exelon reports the uncertainty of a measurement created by statistical process (counting error) as well as all sources of error (Total Propagated Uncertainty or TPU). Each result has two values calculated.
Exelon reports the TPU by following the result with plus or minus +
the estimated sample standard deviation, as TPU, that is obtained by propagating all sources of analytical uncertainty in measurements.
Analytical uncertainties are reported at the 95% confidence level in this report for reporting consistency with the AREOR.
C. Background Analysis A pre-operational radiological environmental monitoring program (pre-operational REMP) was conducted to establish background radioactivity levels prior to operation of the Station. The environmental media sampled and analyzed during the pre-operational REMP were atmospheric radiation, fall-out, domestic water, surface water, aquatic life, and foodstuffs. The results of the monitoring were detailed in the report entitled, Pre-operational Radiological Environmental Monitoring Program Report, Limerick Generating Station Units 1 and 2, 1 January 1982 through 21 December 1984, Teledyne Isotopes and Radiation Management Corporation.
7

The pre-operational REMP contained analytical results from samples collected from both surface water and groundwater.
Monthly surface water sampling began in 1982, and the samples were analyzed for tritium as well as other radioactive analytes. During the preoperational program tritium was detected at a maximum concentration of 420 pCi/L, indicating that these preoperational results were from nuclear weapons testing and is radioactively decaying as predicted.
Gamma isotopic results from the preoperational program were all less than or at the minimum detectable concentration (MDC) level.
: 1. Background Concentrations of Tritium The purpose of the following discussion is to summarize background measurements of tritium in various media performed by others. Additional detail may be found by consulting references.
: a. Tritium Production Tritium is created in the environment from naturally occurring processes both cosmic and subterranean, as well as from anthropogenic (i.e., man-made) sources. In the upper atmosphere, "Cosmogenic" tritium is produced from the bombardment of stable nuclides and combines with oxygen to form tritiated water, which will then enter the hydrologic cycle. Below ground, "lithogenic" tritium is produced by the bombardment of natural lithium present in crystalline rocks by neutrons produced by the radioactive decay of naturally abundant uranium and thorium. Lithogenic production of tritium is usually negligible compared to other sources due to the limited abundance of lithium in rock. The lithogenic tritium is introduced directly to groundwater.
A major anthropogenic source of tritium and strontium-90 comes from the former atmospheric testing of thermonuclear weapons. Levels of tritium in precipitation increased significantly during the 1950s and early 1960s, and later with additional testing, resulting in the release of significant amounts of tritium to the atmosphere. The Canadian heavy water nuclear power reactors, other commercial power reactors, nuclear research and weapons production continue to influence tritium concentrations in the environment.
: b. Precipitation Data Precipitation samples are routinely collected at stations 8

around the world for the analysis of tritium and other radionuclides. Two publicly available databases that provide tritium concentrations in precipitation are Global Network of Isotopes in Precipitation (GNIP) and USEPA's RadNet database. GNIP provides tritium precipitation concentration data for samples collected world wide since 1960. RadNet provides tritium precipitation concentration data for samples collected at stations through out the U.S. Based on GNIP data for sample stations located in the U.S. Midwest, tritium concentrations peaked around 1963. This peak, which approached 10,000 pCi/L for some stations, coincided with the atmospheric testing of thermonuclear weapons. Tritium concentrations in surface water showed a sharp decline up until 1975 followed by a gradual decline since that time.
Tritium concentrations have typically been below 100 pCi/L since approximately 1980. Tritium concentrations in wells may still be above the 200 pCi/L detection limit from the external causes described above. Water from previous years was naturally captured in groundwater. As a result, some well water sources today are affected by the surface water from the 1960s that contained elevated tritium activity.
: c. Surface Water Data Tritium concentrations are routinely measured in the Schuylkill and Delaware Rivers. Pennsylvania surface water data are typically less than 100 pCi/L.
The USEPA RadNet surface water data typically has a reported 'Combined Standard Uncertainty' of 35 to 50 pCi/L.
According to USEPA, this corresponds to a +/-70 to 100 pCi/L 95% confidence bound on each given measurement.
Therefore, the typical background data provided may be subject to measurement uncertainty of approximately +/- 70 to 100 pCi/L.
The radioanalytical laboratory is counting tritium results to an Exelon specified LLD of 200 pCi/L. Typically, the lowest positive measurement will be reported within a range of 40 -
240 pCi/L or 140 +/- 100 pCi/L. Clearly, these sample results cannot be distinguished as different from background at this concentration.
9

IV. Results and Discussion Gamma spectroscopy results for groundwater and surface water sample were reported for twelve nuclides (Mn-54, Co-58, Fe-59, Co-60, Zn-65, Nb-95, Zr-95, I-131, Cs-134, Cs-137, Ba-140 and La-140).
A. Groundwater Results Samples were collected from onsite wells throughout the year in accordance with the station radiological groundwater protection program.
Analytical results and anomalies are discussed below.
Tritium Samples from fifteen locations were analyzed for tritium activity (Table B-1.1, Appendix B). Tritium values ranged from non detectable to 1,320 pCi/L. Well MW-LR-9 had the highest value of 1,320 pCi/L. Although no drinking water pathway is available from groundwater, the theoretical dose via the drinking water pathway was calculated at 0.08 mrem to a child (total body), which represents 1.30% of the 10 CFR 50, Appendix I dose limit of 6 mrem.
Strontium No Sr-90 activity was detected in any of the ground water samples analyzed (Table B-1.1, Appendix B).
Gross Alpha and Gross Beta (dissolved and suspended)
Gross Alpha and Gross Beta analyses in the dissolved and suspended fractions were performed on groundwater surface water samples during the second sampling in 2010. Gross Alpha (dissolved) was detected in 5 of 15 groundwater locations. The concentrations ranged from 2.9 to 6.2 pCi/L. Gross Alpha (suspended) was detected in 8 of 15 groundwater locations. The concentrations ranged from 1.1 to 60.0 pCi/L. Gross Beta (dissolved) was detected in 14 of 15 groundwater locations. The concentrations ranged from 2.1 to 38.5 pCi/L. Gross Beta (suspended) was detected in 11 of 15 groundwater locations. The concentrations ranged from 1.7 to 124.0 pCi/L (Table B-1.1, Appendix B).
Gamma Emitters Potassium-40 was detected at four of 15 groundwater locations with a range of 77 to 136 pCi/L. No other gamma emitting nuclides were detected (Table B-1.2, Appendix B).
10

Hard-To-Detect Hard-To-Detect analyses were performed on a select group of groundwater locations to establish background levels. The analyses included Fe-55, Ni-63, Am-241, Cm-242, Cm-243/244, Pu-238, Pu-239/240, U-233/234, U-235 and U-238. The isotopes of U-233/234 and U-238 were detected at four of six groundwater monitoring locations. The U-233/234 concentrations ranged from 1.4 to 2.7 pCi/L and the U-238 concentrations ranged from 0.8 to 1.2 pCi/L (Table B-1.3, Appendix B).
The concentrations detected are considered background.
All other hard-to-detect nuclides were not detected at concentrations greater than their respective MDCs.
B. Surface Water Results In accordance with the Station's radiological groundwater protection program surface water samples were collected from streams that transverses the site, as well as, from other water bodies that could influence the tritium concentration at Limerick. Analytical results and anomalies are discussed below.
Tritium Samples from nine locations were analyzed for tritium activity. Tritium activity was detected in station SW-LR-8 at a concentration of 196 pCi/Liter (Table B-11.1, Appendix B).
Strontium No Sr-90 activity was detected in any of surface water samples analyzed (Table B-11.1, Appendix B).
Gross Alpha and Gross Beta (dissolved and suspended)
Gross Alpha and Gross Beta analyses in the dissolved and suspended fractions were performed on surface water samples during the second sampling in 2010. Gross Alpha (dissolved) was not detected in any surface water locations. Gross Alpha (suspended) was detected at 2 of 7 surface water locations. The concentration ranged from 1.3 to 1.9 pCi/L.
Gross Beta (dissolved) was detected at all surface water locations. The concentrations ranged from 2.6 to 25.7 pCi/L. Gross Beta (suspended) was detected at 5 of 7 surface water location. The concentration ranged from 1.8 to 6.5 pCi/L (Table B-11.1, Appendix B).
11

Gamma Emitters No gamma emitting nuclides were detected (Table B-I1.2, Appendix B).
C. Drinking Water Well Survey A drinking water well survey was conducted during the summer 2006 by CRA (CRA 2006) around the Limerick Generating Station. CRA reviewed the Pennsylvania Groundwater Information System database to identify wells within a 1-mile radius from the center of the Station. Forty-six domestic withdrawal wells, two industrial wells, two commercial wells, and one institutional well were identified within the specified radius. The well depths range from 78 to 345 feet blow ground surface (bgs), and they yield between 8 and 100 gallons per minute (gpm). All wells are completed in the Brunswick Formation.
The Station has one potable supply well and one fire water well. The potable supply well is constructed as an open-rock borehole. Groundwater was measured at a depth 102 feet bgs during a well pump replacement in 2004 (personal communication with Station, 2006). The pump was placed at a depth of approximately 294 feet bgs. The total well depth and the depth of the steel casing are unknown. The well is located approximately 175 feet east of the Reactor Building. The Station estimates that the well is pumped at approximately 2 gpm. The fire water well is constructed as an open-rock borehole. Groundwater was encountered at 121 feet bgs during a well pump replacement in 2004. The well pump was placed at a depth of approximately 399 feet bgs. The total well depth and the depth of the steel casing are unknown. The well is located approximately 500 feet east of the cooling towers. The well is used only in an emergency fire situation; therefore, water use is estimated to be zero.
D. Summary of Results - Inter-Laboratory Comparison Program Inter-Laboratory Comparison Program results for TBE are presented in the Annual Radiological Environmental Operating Report.
E. Leaks, Spills, and Releases There were no leaks, spills or releases to the ground that could impact the ground water.
F. Trends Well MW-LR-9 tritium concentration levels continue to decrease from the levels observed from the 2009 leak.
12

G. Investigations Conclusions from the Phase 1 report have been made available to state and federal regulators and to the public. Currently no investigations are on going.
H. Actions Taken
: 1. Compensatory Actions There have been no station events requiring compensatory actions at the Limerick Generating Station.
: 2. Installation of Monitoring Wells No new wells have been installed in 2010
: 3. Actions to Recover/Reverse Plumes No actions were required to recover or reverse groundwater plumes.
V. References
: 1. Conestoga Rovers and Associates, Fleetwide Assessment, Limerick Generating Station, Sanatoga, Pennsylvania, Ref. No. 045136(17), September 2006
: 2. Pre-operational Radiological Environmental Monitoring Program Report, Limerick Generating Station Units 1 and 2, 1 January 1982 through 21 December 1984, Teledyne Isotopes and Radiation Management Corporation.
13

Intentionally Left Blank APPENDIX A LOCATION DESIGNATION

TABLE A-1: Radiological Groundwater Protection Program - Sampling Locations for the Limerick Generating Station, 2010 Location                         Type               Distance MW-LR-1                          Monitoring  Well   Onsite MW-LR-2                          Monitoring  Well   Onsite MW-LR-3                          Monitoring  Well   Onsite MW-LR-4                          Monitoring  Well   Onsite MW-LR-5                          Monitoring  Well   Onsite MW-LR-6                          Monitoring  Well   Onsite MW-LR-7                          Monitoring  Well   Onsite MW-LR-8                          Monitoring  Well   Onsite MW-LR-9                          Monitoring  Well   Onsite P11                              Monitoring  Well   Onsite P14                              Monitoring  Well   Onsite P16                              Monitoring  Well   Onsite P17                              Monitoring  Well   Onsite P3                               Monitoring  Well   Onsite SP22                             Monitoring  Well   Onsite SW-LR-2                          Surface  Water     Offsite SW-LR-4                          Surface  Water     Offsite SW-LR-6                          Surface  Water     Offsite SW-LR-7                          Surface  Water     Onsite SW-LR-8 (Hold Pond)              Surface  Water     Onsite SW-LR-9 (Spray Pond)             Surface  Water     Onsite SW-LR-1 0                        Surface  Water     Onsite A-1

Figure 1 Routine Well Water and Surface Water Sample Locations for the Radiological Groundwater Protection Program, Limerick Generating Station, 2010 A-2

APPENDIX B DATA TABLES

TABLE B-1.1      CONCENTRATIONS OF TRITIUM, STRONTIUM-90, GROSS ALPHA AND GROSS BETA IN WELL WATER SAMPLES COLLECTED AS PART OF THE RADIOLOGICAL GROUNDWATER PROTECTION PROGRAM, LIMERICK GENERATING STATION, 2010 RESULTS IN UNITS OF PCI/LITER +/- 2 SIGMA COLLECTION SITE              DATE                        H-3        SR-90       GR-A (DIS)     GR-A (SUS)      GR-B   (DIS)   GR-B (SUS)
MW-LR-1          05/04/2010
* 172                       < 3.9           < 0.9                 14 +/- 3.8       3.8 +/- 1.4 MW-LR-1          08/11/2010
* 180             < 0.6        2.9 + 1.9    < 2.2                39  +/- 1.9 < 3.2 MW-LR-1          10/19/2010
* 179                       < 2.0           < 1.5               8.0  +/- 2.9 < 1.8 MW-LR-2          05/05/2010           < 173                       < 2.5               1.3  +/- 0.7      3.6  +/- 1.9 < 1.6 MW-LR-2          08/13/2010
* 178             < 0.8     < 2.7               1.3  +/- 0.9      3.9  +/- 2.2       2.2  +/- 1.2 MW-LR-2          10/19/2010
* 176                       < 2.3           < 1.5           < 3.1                2.4  +/- 1.3 MW-LR-3          05/05/2010           < 174                       < 2.3               1.5  +/- 0.9      5.1  +/- 2.3         11 +/- 1.7 MW-LR-3          05/05/2010           < 174                       < 3.0           < 0.6               6.0  +/- 2.5 < 1.6 MW-LR-3          08/13/2010           < 174             < 0.8     < 2.6               1.7  +/- 1.0  < 3.2                 3.3 +/- 1.3 MW-LR-3          10/20/2010
* 175                       < 2.0           < 1.4               5.8  +/- 2.7 < 1.8 MW-LR-4          05/04/2010
* 177                       < 3.3           < 0.6               7.1  +/- 2.9 < 1.6 MW-LR-4          08/13/2010           < 171             < 0.5     < 3.1           < 0.9           < 3.9          < 1.7 MW-LR-4          10/20/2010           < 175                       < 2.6           < 1.5               5.4  +/- 3.0 < 1.8 MW-LR-5          05/05/2010           < 175                          3.1 +/- 2.0        2.7  +/- 1.0      5.6  +/- 2.1       4.1  +/- 1.3 MW-LR-5          08/13/2010
* 176             < 0.8     < 2.6           < 1.0                 12 +/- 2.8        3.3 +/- 1.3 MW-LR-5          08/13/2010           < 178             < 0.7     < 2.8           < 0.9               9.2  +/- 2.5       2.0  +/-1.2 MW-LR-5          10/19/2010           < 178                          6.2 +/- 2.1    < 1.5           < 3.7          < 1.8 MW-LR-6          05/05/2010
* 177                       < 0.5               1.6  +/- 0.8      2.1  +/- 1.1        1.9 +/-1.1 MW-LR-6          08/13/2010           < 173             < 0.5     < 2.5               3.6  +/- 1.3      4.5  +/- 2.5       4.9  +/-1.4 MW-LR-6          10/19/2010           < 181                       < 2.3           < 1.7               3.7  +/- 2.2 < 2.0 MW-LR-7          05/05/2010           < 180                       < 2.2           < 0.6               3.6  +/- 1.7 < 1.6 MW-LR-7          08/13/2010
* 177             < 0.9     < 2.0           < 1.0               2.7  +/- 1.7 < 1.7 MW-LR-7          10/19/2010
* 176                       < 1.1           < 4.0                 14 +/- 2.4 < 2.6 MW-LR-8          05/04/2010               24 3 +/-  119             < 3.4           < 0.6               5.3  +/- 2.8        1.9 +/- 1.1 MW-LR-8          08/10/2010               24 5 +/-  115   < 0.6     < 2.8           < 0.9           < 3.8                 1.7 +/- 1.1 MW-LR-8          10/19/2010               23 8 +/-  117             < 2.4           < 1.4               3.7  +/- 1.2 < 1.8 MW-LR-8          10/19/2010           < 178                       < 2.5           < 1.4               5.2  +/- 1.3 < 1.8 MW-LR-9          01/12/2010              132 0 +/-  180                (1)            (1)                      (1)              (1)
MW-LR-9          05/04/2010               96 4 +/-  162                3.1 +/- 1.9    < 3.5               7.2  +/- 2.5 < 2.6 MW-LR-9          05/04/2010               79 3 +/-  145             < 2.3                 11 +/- 4.9      5.6  +/- 2.3         24 +/- 3.0 MW-LR-9          08/10/2010           < 179             < 0.8     < 2.8           < 1.0               9.2  +/- 2.5 < 1.7 MW-LR-9          08/10/2010               30 8 +/-  118   < 0.7     < 2.9           < 1.8               6.9  +/- 2.3        8.9 +/- 1.9 MW-LR-9          10/19/2010               45 55 +/- 127                4.0 +/- 1.9    < 3.4               6.0  +/- 2.2        3.1 +/- 1.7 MW-LR-9          10/19/2010               54 7 +/-  126             < 2.3               4.4  +/- 2.6      6.2  +/- 2.3         10 +/- 2.1 Pll              05/04/2010           < 173                       < 3.8               1.1  +/- 0.7        19 +/- 4.2        1.8 +/- 1.1 P11              08/10/2010           < 178             < 0.7     < 3.5           < 0.9           < 4.0                 2.8 +/- 1.2 P1l              08/10/2010           < 170             < 0.5     < 3.2           < 0.9                 14 +/- 3.4 < 1.6 P1l              10/19/2010           < 168                       < 2.3           < 1.4                 15 +/- 3.5 < 1.8 P1l              10/19/2010           < 171                       < 2.3           < 1.5                 13 +/- 3.4 < 1.8 P14              05/04/2010           < 173                       < 3.8                 12 +/- 4.1      5.3  +/- 3.2         32 +/- 3.2 P14              08/11/2010           < 170             < 0.6     < 3.6                 19 +6.4   < 4.0                  28 +/- 3.2 P14              10/19/2010           < 170                       < 3.1                 12 + 5.5      4.3  +/- 1.6         28 +/- 3.6 P16              05/05/2010           < 173                       < 8.7                60  +/- 10.4       18 +/- 8.0       124  +/- 9.3 P16              08/10/2010           < 172                          (2)                     (2)             (2)              (2)
P16              10/19/2010           < 170                       < 5.2                35 +/- 8.0         16 +/- 6.4         74 +/- 6.4 P17              05/04/2010           < 169                       < 2.4           < 0.5           < 3.6          < 1.5 P17              08/11/2010           < 168             < 0.6     < 2.5           < 0.9           < 3.4          < 1.6 P17              10/19/2010           < 176                       < 2.0           < 1.4           < 3.8          < 1.8 (1) Analyses not added until May 2010 (2) Gross Alpha and Gross Beta analyses could not be performed due to low sample volume Samples are distilled for H-3 analysis B-1

TABLE B-I.1 CONCENTRATIONS OF TRITIUM, STRONTIUM-90, GROSS ALPHA AND GROSS BETA IN WELL WATER SAMPLES COLLECTED AS PART OF THE RADIOLOGICAL GROUNDWATER PROTECTION PROGRAM, LIMERICK GENERATING STATION, 2010 RESULTS IN UNITS OF PCI/LITER +/- 2 SIGMA COLLECTION SITE           DATE                     H-3  SR-90    GR-A (DIS)   GR-A (SUS)   GR-B (DIS)    GR-B (SUS)
P3            05/04/2010          < 168             < 2.3        < 0.5            8.4 +/- 2.5 < 1.5 P3            08/11/2010          < 171     < 0.7   < 2.8        < 0.9        < 3.0         < 1.6 P3            10/19/2010          < 177               4.0 +/- 2.0  < 1.4        < 3.2         < 1.8 SP22          05/04/2010          < 171             < 2.4        < 0.5            6.7 +/- 2.8 < 1.5 SP22          08/11/2010          < 177     < 0.9     5.8 +/- 2.4  < 0.9            4.9 +/- 2.7       3.3 +/- 1.2 SP22          10/19/2010          < 172             < 2.3        < 1.4            7.7 +/- 1.4 < 1.8 Samples are distilled for H-3 analysis A
B-2

Q TABLE B-I.2            CONCENTRATIONS OF GAMMA EMITTERS IN WELL WATER SAMPLES COLLECTED AS PART OF THE RADIOLOGICAL GROUNDWATER PROTECTION PROGRAM, LIMERICK GENERATING STATION, 2010 RESULTS IN UNITS OF PCI/LITER +/- 2 SIGMA STC         COLLECTION    Be-7      K-40   Mn-54 Co-58  Fe-59 Co-60  Zn-65  Nb-95  Zr-95   1-131 Cs-134 Cs-137 Ba-140 La-140 PERIOD MW-LR-1     08/11/2010  <  46    133  +/- 48 < 4   <5    <  10  <5    < 10   <5     <8     <  13   <5     <5     < 31   <8 MW-LR-2     08/13/2010  <  45  <47         <5    <6    <  12  <4    < 11   <6     <8     <  13   <5     <5     < 34   < 12 MW-LR-3     08/13/2010  <  47  <50         <5    <5    <  12  <5    <8     <6     <9     <  12   <5     <5     < 29   < 10 MW-LR-4     08/13/2010  <  44  < 110       < 5   <6    <  10  <9    < 13   <6     < 10   <  12   <5     <5     < 30   <9 MW-LR-5     08/13/2010  <  52     77  +/- 49 < 4   <4    <  10  <4    < 12   <5     <8     <  11   <5     <5     < 29   < 10 MW-LR-5     08/13/2010  <  50  <46         <4    <5    <  11  <5    <8     <6     <9     <  13   <5     <5     < 33   < 10 MW-LR-6     08/13/2010  <  65  <65         <7    <7    <  15  <7    < 15   < 10   < 13   <  15   <6     <7     < 36   < 12 MW-LR-7     08/13/2010  <  52  <94         <6    <7    <  12  <6    < 13   <7     < 11   <  14   <7     <7     < 36   <9 MW-LR-8     08/10/2010  <  34  <54         <4    <3    <7     <4    <7     <4     <6     <7      <3     <4     < 21   <7 MW-LR-9     08/10/2010  <  39  <82         <4    <4    <9     <4    <8     <5     <9     <  14   <4     <5     < 30   <8 MW-LR-9     08/10/2010  <  41  <41         <4    <4    <8     <4    <8     <5     <8     <  10   <4     <4     < 23   <8 Pl1         08/10/2010  <  39  <77         <4    <4    <9     <4    <9     <5     <7     <  14   <4     <4     < 30   <9 P1l         08/10/2010  <  43  <32         <4    <4    <9     <3    <9     <5     <8     <  11   <4     <6     < 29   <8 P14         08/11/2010  <  60    136  +/- 66 < 7   <4    < 13   <7    <9     <7     <9     <  12   <7     <6     < 32   < 13 P16         08/10/2010  <  52  <41         <5    <5    < 12   <5    <  10  <6     < 10   <  14   <6     <5     < 33   <9 P17         08/11/2010  <  51    124  +/- 54 < 5   <5    < 11   <5    <9     <5     <8     <  14   <5     <6     < 33   <8 P3          08/11/2010  <  43  <79         <5    <4    < 10   <6    <9     <7     <9     <  10   <5     <5     < 28   <7 SP-22       08/11/2010  <  42  <37         <4    <4    <8     <4    <9     <5     <8     <  13   <5     <4     < 29   <8 B-3

TABLE B-I.3 CONCENTRATIONS OF HARD TO DETECTS IN GROUNDWATER SAMPLES COLLECTED AS PART OF THE RADIOLOGICAL GROUNDWATER PROTECTION PROGRAM, LIMERICK GENERATING STATION, 2010 RESULTS IN UNITS OF PCI/LITER +/- 2 SIGMA STC         COLLECTION      AM-241 CM-242    CM-243/244 PU-238 PU-239/240   U-233/234  U-235       U-238      FE-55   N1-63 PERIOD MW-LR-1     05/04/2010       < 0.1 < 0.13     < 0.11    < 0.2   < 0.1     < 0.1        0.06  < 0.1           < 75    < 4.2 MW-LR-3     05/05/2010       < 0.1 < 0.10     < 0.10    < 0.2   < 0.1        2.7 + 0.4 0.04     0.9  +/- 0.2   < 141   < 4.3 MW-LR-7     05/05/2010       < 0.2 < 0.08     < 0.07    < 0.2   < 0.2     < 0.2        0.07  <0.1            < 78    < 4.3 MW-LR-8     05/04/2010       < 0.1 < 0.05     < 0.02    < 0.1   < 0.2        2.1 + 0.3 0.04     0.8  +/- 0.2   < 72    < 3.9 P-17        05/04/2010       < 0.2 < 0.07     < 0.11    < 0.1   < 0.1        1.4 + 0.3 0.06     0.9  +/- 0.2   < 146   < 4.2 P-3         05/04/2010       < 0.2 < 0.15     < 0.03    < 0.1   < 0.1        2.5 + 0.4 0.02    .1.2  +/- 0.2
* 179   < 4.2 B-4 IJ
* p                                                                        .,' I t,  t

TABLE B-1I.1   CONCENTRATIONS OF TRITIUM, STRONTIUM-90, GROSS ALPHA AND GROSS BETA IN SURFACE WATER SAMPLES COLLECTED AS PART OF THE RADIOLOGICAL GROUNDWATER PROTECTION PROGRAM, LIMERICK GENERATING STATION, 2010 RESULTS IN UNITS OF PCI/LITER +/- 2 SIGMA COLLECTION SITE            DATE                 H-3     SR-90 GR-A (DIS)   GR-A (SUS)    GR-B (DIS)  GR-B (SUS)
SW-LR-2        05/03/2010     < 172                 < 1.2        1.9 +/- 1.1     3.6 +/- 1.5   3.3 +/- 1.4 SW-LR-2        08/12/2010     < 180         < 0.5   < 2.7     < 0.9        < 2.7           3.3 +/- 1.2 SW-LR-2        10/18/2010     < 171                 < 1.3     < 1.5        < 2.7         < 1.8 SW-LR-4        05/04/2010     < 170                 < 1.1     < 0.6            2.9 +/- 1.5 < 1.6 SW-LR-4        08/12/2010     < 174         < 0.8   < 2.1     < 0.9        < 2.6           3.3 +/- 1.3 SW-LR-4        10/18/2010     < 171                 < 1.3     < 1.5        < 2.7         < 1.8 SW-LR-6        05/03/2010     < 176                 < 1.4        1.3 + 0.8     2.6 +/- 1.5   2.9 +/- 1.3 SW-LR-6        08/12/2010     < 179         < 0.6   < 2.8     < 0.9        < 2.8           2.9 +/- 1.2 SW-LR-6        10/18/2010     < 171                 < 1.4     < 1.5        < 2.7         < 1.8 SW-LR-7        05/03/2010     < 172                 < 1.6     < 0.6            3.9 +/- 1.7    1.8 +/- 1.1 SW-LR-7        08/12/2010     < 172         < 0.6   < 2.8     < 0.9            5.2 +/- 2.2 < 1.6 SW-LR-7        10/18/2010     < 170                 < 1.5     < 1.4        < 2.8         < 1.8 SW-LR-8        05/05/2010     < 171                 < 2.3     < 0.9            9.6 +/- 2.7 < 1.7 SW-LR-8        08/11/2010     < 171         < 0.5   < 2.5     < 0.9             20 +/- 3.6 < 1.7 SW-LR-8        10/20/2010        19(  + 114         < 2.1     < 1.5             15 +/- 3.1 < 1.8 SW-LR-9        05/05/2010     < 175                 < 2.3     < 0.9             11 +/- 2.8 < 1.7 SW-LR-9        08/11/2010     < 172         < 0.5   < 2.9     < 1.0             26 +/- 4.0 < 1.7 SW-LR-9        10/20/2010     < 170                 < 2.2     < 1.6             22 +/- 3.9 < 1.9 SW-LR-10       05/04/2010     < 171                 < 2.3     < 0.9            3.8 +/- 2.0 < 1.7 SW-LR-10       05/04/2010     < 172                 < 2.2     < 0.9            4.5 +/- 2.0 < 1.7 SW-LR-10       08/12/2010     < 181         < 0.7   < 2.7     < 0.9        < 3.1           6.5 +/- 1.4 SW-LR-10       10/18/2010     < 168                 < 1.7     < 1.4        < 2.8         < 1.8 SAMPLES ARE DISTILLED FOR H-3 ANALYSIS B-5

TABLE B-II.2            CONCENTRATIONS OF GAMMA EMITTERS IN SURFACE WATER SAMPLES COLLECTED AS PART OF THE RADIOLOGICAL GROUNDWATER PROTECTION PROGRAM, LIMERICK GENERATING STATION, 2010 RESULTS IN UNITS OF PCI/LITER +/- 2 SIGMA STC          COLLECTION  Be-7    K-40        Mn-54 Co-58  Fe-59 Co-60  Zn-65 Nb-95 Zr-95 1-131 Cs-1 34 Cs-137 Ba-140 La-140 PERIOD SW-LR-2      08/12/2010   <  40     171 + 53 < 5   <5     < 12  <8     <12   <6    <9       10 <4      <5     < 29      12 SW-LR-4      08/12/2010   <  52     199 + 59 < 5   <5     < 12  <5     < 10  <7    < 10     13 <6      <5     < 36     7 SW-LR-6      08/12/2010   <  27  < 44        <3    <3     <6    <2     <7    <3    <6       10 <3      <3     < 19     6 SW-LR-7      08/12/2010   <  45  < 108       <5    <6     < 11  <4     < 10  <6    < 10     14 <5      <5     < 30     9 SW-LR-8      08/11/2010   <  38  < 89        <4    <4     <9    <3     <9    <5    <8       10 <4      <5     < 24     8 SW-LR-9      08/11/2010   <  50  < 95        <5    <5     < 10  <5     <9    <5    <9       11 <5      <6     < 26     7 SW-LR-10     08/12/2010   <  46  < 88        <4    <5     < 10  <5     <9    <6    <9       13 <4      <5     < 31     8 B-6 a,}}