RA08-027, Annual Radioactive Effluent Release Report

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Annual Radioactive Effluent Release Report
ML081280837
Person / Time
Site: LaSalle  Constellation icon.png
Issue date: 04/30/2008
From: Enright D J
Exelon Generation Co, Exelon Nuclear
To:
Document Control Desk, Office of Nuclear Reactor Regulation
References
FOIA/PA-2010-0209, RA08-027
Download: ML081280837 (97)
v • d • e


Text

Exeltn.Exelon Generation Company, LLC www.exeloncorp.com Nuclear LaSalle County Station 2601 North 21" Road Marseilles, IL 61341-9757 RA08-027 10 CFR 50.36a April 30, 2008 U. S. Nuclear Regulatory Commission Attention:

Document Control Desk Washington, D.C. 20555 LaSalle County Station, Units 1 and 2 Facility Operating License Nos. NPF-1 1 and NPF-18 NRC Docket Nos. 50-373 and 50-374

Subject:

2007 Annual Radioactive Effluent Release Report Enclosed is the Exelon Generation Company, LLC, 2007 Annual Radioactive Effluent Release Report for LaSalle County Station, submitted in accordance with 10 CFR 50.36a, "Technical specifications on effluents from nuclear power reactors," paragraph (a)(2) and Technical Specification 5.6.3, "Radioactive Effluent Release Report." Should you have any questions concerning this letter, please contact Mr. Terrence Simpkin, Regulatory Assurance Manager, at (815) 415-2800.Respectfully, Daniel J. Enright Site Vice President LaSalle County Station Attachment cc: Regional Administrator

-NRC Region III NRC Senior Resident Inspector

-LaSalle County Station EFFLUENT AND WASTE DISPOSAL ANNUAL REPORT (2007)Supplemental Information Regulatory Limits a. Gaseous Effluents 1) The air dose due to noble gases released in gaseous effluents, from each reactor unit, from the site shall be limited to the following:

a) During any calendar quarter: Less than or equal to 5 mrad for gamma radiation and less than or equal to 10 mrad for beta radiation, and b) During any calendar year: Less than or equal to 10 mrad for gamma radiation and less than or equal to 20 mrad for beta radiation.

2) The dose to an individual from radioiodines and radioactive materials in particulate form, and radionuclides, other than noble gases, with half-lives greater than eight days in gaseous effluents released, from each reactor unit, from the site shall be limited to the following:

3)a) During any calendar quarter: Less than or equal to 7.5 mRem to any organ, and b) During any calendar year: Less than or equal to 15 mRem to any organ.b. Liquid Effluents 1) The dose or dose commitment to an individual from radioactive materials in liquid effluents released, from each reactor unit, from the site shall be limited: a) During any calendar quarter: Less than or equal to 1.5 mRem to the total body and to less than or equal to 5 mRem to any organ, and b) During any calendar year: Less than or equal to 3 mRem to the total body and to less than or equal to 10 mRem to any organ.c. Total Dose -1) The dose or dose commitment to any member of the public, due to releases or radioactivity and radiation, from uranium fuel cycle sources shall be limited to less than or equal to 25 mRem to the body or any organ (except the thyroid, which shall be limited to less than or equal to 75 mRem)over 12 consecutive months.

EFFLUENT AND WASTE DISPOSAL ANNUAL REPORT (2007)Supplemental Information (continued)

2. Allowable Concentrations

-a. Gaseous Effluents I) The dose rate due to radioactive materials released in gaseous effluents from the site shall be limited to the following:

a) For noble gases: Less than or equal to 500 mRem/year to the total body and less than or equal to 3000 mRem/year to the skin, and b) For all radioiodines and for all radioactive materials in particulate form, and radionuclides, other than noble gases, with half-lives greater than eight days: Less than or equal to 1500 mRem/year to any organ via the inhalation pathway.b. Liquid Effluents I) The concentration of radioactive material released from the site shall be limited to ten (10) times the concentrations specified in 10 CFR Part 20, Appendix B, Table II, Column 2 for radionuclides other than dissolved or entrained noble gases. For dissolved or entrained noble gases, the concentration shall be limited to the following:

Nuclide DWC (uci/ml)Kr-85m 2.OOE-04 Kr-85 5.OOE-04 Kr-87 4.OOE-05 Kr-88 9.OOE-05 Ar-41 7.OOE-05 Xe-131m 7.OOE-04 Xe-133m 5.OOE-04 Xe-133 6.OOE-04 Xe-135m 2.OOE-04 Xe- 135 2.OOE-04 3. Average Energy Not applicable

-average energy is no longer used to determine dose to the public.4. Measurements and Approximations of Total Radioactivity

a. Gaseous Effluents 1) Containment Vent and Purge System is sampled by grab sample which is analyzed for principal gamma emitters and H-3.2) Main Vent Stack is sampled by grab sample, which is analyzed for principal gamma emitters and H-3.3) Standby Gas Treatment System is sampled by grab sample, which is analyzed for principal gamma emitters.

EFFLUENT AND WASTE DISPOSAL ANNUAL REPORT (2007)Supplemental Information (continued)

4) All release types as listed in I and 2 above, at the vent stack and as listed in 3 above, at the Standby Gas Treatment System whenever there is flow, are continuously sampled by charcoal cartridge and particulate filter paper, which are analyzed for iodines and principal gamma emitters.

Particulate filter papers are composited and analyzed for gross alpha, Sr-89 and Sr-90. Noble gases, gross beta and gamma are continuously monitored by noble gas monitors for the vent stack and the standby gas treatment system.b. Liquid Effluents 1) Batch waste release tanks are sampled each batch for principal gamma emitters, 1-131, dissolved and entrained noble gases, H-3, gross alpha, Sr-89, Sr-90 and Fe-55.2) Continuous releases are sampled continuously in proportion to the rate of flow of the effluent stream and by grab sample. Samples are analyzed for principal gamma emitters, 1-131, dissolved and entrained noble gases, H-3, gross alpha, Sr-89, Sr-90 and Fe-55.5. Batch Releases a. Gaseous 1) Number of batch releases: 2) Total time period for batch releases: 3) Maximum time period for a batch release: 4) Average time period for batch releases: 5) Minimum time period for a batch release: b. Liquid 1) Number of batch releases: 2) Total time period for batch releases:

Min.3) Maximum time period for a batch release: Min.4) Average time period for batch releases:

Min.5) Minimum time period for a batch release: Min.6) Average stream flow during periods of release of effluent into a flowing stream: gpm None N/A N/A N/A N/A None N/A N/A N/A N/A N/A EFFLUENT AND WASTE DISPOSAL ANNUAL REPORT (2007)Supplemental Information (continued)

6. Abnormal Releas(a. Gaseous 1)2)b. Liquid 1)2)Number of releases: Total activity released: Number of releases: Total activity released: None N/A None N/A 7. Process Control Program There were no changes to the Process Control Program during this time period.8. Effluent Monitoring Instrumentation timeclocks and sample anomalies.

Time clocks: There were no effluent monitoring time clocks exceeded in 2007.Sample anomalies:

There were no sampling anomalies experienced during 2007.9. Offsite Dose Calculation Manual Revisions.

There were no revisions made to the ODCM in 2007.

LASALLE COUNTY NUCLEAR POWER STATION EFFLUENT AND WASTE DISPOSAL ANNUAL REPORT (2007)UNITS ONE AND TWO DOCKET NUMBERS 50-373 AND 50-374 GASEOUS EFFLUENTS-SUMMATION OF ALL RELEASES Estimated Total Error %I Units I l stQtr I 2ndQtr I 3rdQtr I 4t'Qtr A. Fission and Activation Gas Releases 1. Total Release Activity Ci 6.23E+02 6.61 E+02 6.26E+02 7.19E+02 3.50E+01 2. Average Release Rate uCi/sec 8.01 E+01 8.40E+01 7.87E+01 9.04E+01 3. Percent of Technical Specification

%* * * *Limit B. Iodine Releases 1. Total 1- 131 Activity Ci 1.56E-02 1.90E-02 2.76E-02 1.79E-02 3.50E+01 2. Average Release Rate uCi/sec 2.OOE-03 2.42E-03 3.47E-03 2.26E-03 3. Percent of Technical Specification

%* * * *Limit C. Particulate

(> 8 day half-life)

Releases 1. Gross Activity Ci 3.06-02 3.05E-03 3.75E-03 3.15E-03 3.30E+01 2. Average Release Rate uCi/sec 3.94E-04 3.87E-04 4.71 E-04 3.95E-04 3. Percent of Technical Specification

%* * * *Limit 3. Gross Alpha Activity Ci <I.OOE-11

<1.OOE-11

<1.OOE-11

<1.OOE-11 D. Tritium Releases 1. Total Release Activity ["Ci [ 2.27E+01 [,2.17E+01 I 2.21E+01 I 2.87E+01 I 2.10E+01 12. Average Release Rate uCi/sec I 2.92E+00 I '2.76E+00 I 2.78E+00 I 3.61E+00 I 3. Percent of Technical Specification

% * * * *[Limitj _ _ I _ _ I _ _ I ___ _"* This information is contained in the Radiological Impact on Man section of the report."<" Indicates activity of sample is less than LLD given in uCi/ml LASALLE COUNTY NUCLEAR POWER STATION EFFLUENT AND WASTE DISPOSAL ANNUAL REPORT (2007)GASEOUS EFFLUENTS-ELEVATED RELEASE Unit 1 and Unit 2 Continuous Mode I Units I 1't Qtr I 2nd Qtr I 3r1 Qtr I 4th Qtr I 1. Fission and Activation Gas Releases Ar-41 Ci 7.29E-04 <1.OOE-4 <1.OOE-4 <1.OOE-4 Kr-85 Ci <1.OOE-4 <1.OOE-4 <1.OOE-4 <1.OOE-4 Kr-85m Ci 1.87E+02 1.88E+02 1.80E+02 1.73E+02 Kr-87 Ci 1.48E+01 3.81 E+00 3.99E+00 <1.OOE-4 Kr-88 Ci 2.74E+02 2.92E+02 2.45E+02 3.37E+02 Xe-131m Ci <1.OOE-4 <1.OOE-4 <1.OOE-4 <1.OOE-4 Xe- 133 Ci 1.47E+02 1.76E+02 1.97E+02 2.09E+02 Xe- 133m Ci 2.42E-04 <1.OOE-4 <1.OOE-4 <1.OOE-4 Xe-135 Ci 6.01 E-01 6.01 E-01 <1.OOE-4 <1 .OOE-4 Xe- I35m Ci 4.38E-04 <1.OOE-4 <1.OOE-4 <1.OOE-4 Xe- 138 Ci <1.OOE-4 <1.OOE-4 <1.OOE-4 <1.OOE-4 TOTAL Ci 6.23E+02 6.60E+02 6.26E+02 7.19E+02 2. Iodine Releases 1-131 Ci 1.56E-02 1.90E-02 2.76E-02 1.79E-02 1-132 Ci 1.91 E-02 3.43E-02 4.55E-02 2.03E-02 1-133 Ci 3.98E-02 5.61 E-02 8.32E-02 4.72E-02 1-134 Ci 9.54E-03 <1.OOE-11 9.89E-03 1.1OE-02 1-135 Ci 3.16E-02 5.11E-02 6.84E-02 3.37E-02 TOTAL IODINE Ci 1.16E-01 1.61 E-01 2.35E-01 1.30E-01 TOTAL 1-131, 1-133, 1-135 Ci 8.70E-02 1.26E-01 1.79E-01 9.88E-02 3. Particulate ( > 8 day half-life)

Releases Cr-51 Ci <1.OOE-11

<1.OOE-11

<1.OOE-11

<1.OOE-11 Mn-54 Ci <1.OOE-11 5.14E-05 1.08E-05 <1.00e-11 Co-57 Ci <1.OOE-11

<1.OOE-11

<1.OOE-11

<1.00E-11 Fe-55 Ci <1.OOE-11

<1.OOE-11

<1.OOE-11

<1.OOE-11 Co-58 Ci <1.OOE-11

<1.OOE-11

<1.OOE-11

<1.OOE-11 Fe-59 Ci <1.OOE-1 1 <1.OOE-1 1 <1.OOE-1 1 <1.OOE-1 1 Co-60 Ci 5.25E-05 1.36E-04 2.08E-04 2.40E-04 Zn-65 Ci <1.OOE-11

<1.OOE-11

<1.OOE-11

<1.OOE-11 Sr-89 Ci 2.90E-02 9.51 E-04 1.1 OE-03 7.46E-04 Sr-90 Ci <1.OOE-11

<1.OOE-11

<1.OOE-11

<1.00E-11 Zr-95 Ci <1.OOE-1 1 <1.OOE-11

<1.00E-11

<1.00E-11 Mo-99 Ci <1.OOE-11

<1.OOE-11

<1.OOE-11

<1.OOE-11 Ru-103 Ci <1.OOE-11

<1.OOE-11

<1.OOE-11

<1.OOE-11 Sn- 117m Ci <1.OOE-11

<1.OOE-11

<1.OOE-11

<1.OOE-11 Cs-134 Ci <1.OOE-11

<1.OOE-11

<1.OOE-11

<1.OOE-11 Cs-137 Ci 1.31E-04 <1.OOE-11

<1.OOE-11

<1.00E-11 Ba\La- 140 Ci 1.42E-03 1.91 E-03 2.43E-03 2.16E-03 Ce- 141 Ci <1.OOE-1 1 <1.OOE-1 1 <1.OOE-1 1 <1.00E-1 1 Ce-144 Ci <1.OOE-11

<1.OOE-11

<1.00E-11

<1.OOE-11 TOTAL PARTICULATES Ci 3.06E-02 3.05E-03 3.75E-03 3.15E-03 4. Tritium Releases I. Total Release Activity Ci 2.27E+01 2.17E+01 2.21 E+01 2.87E*01"<" Indicates activity of sample is less than LLD given in uCi/ml LASALLE COUNTY NUCLEAR POWER STATION EFFLUENT AND WASTE DISPOSAL ANNUAL REPORT (2007)LIQUID RELEASES UNIT 1 and UNIT 2 SUMMATION OF ALL LIQUID RELEASES Estimated 2nd Qtr I 3rd Qtr I 4th Qtr Total Error %Units I 1st Qtr A. Fission and Activation Products 1. Total Activity Released Ci <LLD <LLD <LLD <LLD N/A 2. Average Concentration Released uCi/ml <LLD <LLD <LLD <LLD 3. Percent of Applicable Limit %* * * *B. Tritium 1. Total Activity Released Ci <LLD <LLD <LLD <LLD N/A 2. Average Concentration Released uCi/ml <LLD <LLD <LLD <LLD 3. Percent of Applicable Limit %* * * *C. Dissolved Noble Gases 1. Total Activity Released Ci <LLD <LLD <LLD <LLD N/A 2. Average Concentration Released uCi/ml <LLD <LLD <LLD <LLD 3. Percent of Applicable Limit %* * * *D. Gross Alpha 1. Total Activity Released (estimate)

Ci <LLD <LLD <LLD <LLD N/A 2. Average Concentration Released uCi/ml <LLD <LLD <LLD <LLD 3. Percent of Applicable Limit %* * * *IE. Volume of Liquid Waste to Discharge liters o.OOE+00 o.OOE+00 o.OOE+00 o.OOE+00 N/A IF. Volume of Dilution Water liters 0.OOE+00 0.OOE+00 0.OOE+00 0.00E+00 N/A"*" This information is contained in the Radiological Impact on Man section of the report."<" Indicates activity of sample is less than LLD given in uCi/ml LASALLE COUNTY NUCLEAR POWER STATION EFFLUENT AND WASTE DISPOSAL ANNUAL REPORT (2007)LIQUID RELEASES UNIT 1 and UNIT 2 BATCH MODE INuclides From Batch Releases Units I 1st Qtr I 2nd Qtr I 3rd Qtr I 4th Qtr H-3 Ci <LLD <LLD <LLD <LLD Cr-51 Ci <LLD <LLD <LLD <LLD Mn-54 Ci <LLD <LLD <LLD <LLD Fe-55 Ci <LLD <LLD <LLD <LLD Co-58 Ci <LLD <LLD <LLD <LLD Fe-59 Ci <LLD <LLD <LLD <LLD Co-60 Ci <LLD <LLD <LLD <LLD Zn-65 Ci <LLD <LLD <LLD <LLD Sr-89 Ci <LLD <LLD <LLD <LLD Sr-90 Ci <LLD <LLD <LLD <LLD Nb-95 Ci <LLD <LLD <LLD <LLD Zr-95 Ci <LLD <LLD <LLD <LLD Mo-99 Ci <LLD <LLD <LLD <LLD Tc-99m Ci <LLD <LLD <LLD <LLD Ag-r 10m Ci <LLD <LLD <LLD <LLD Sb- 122 Ci <LLD <LLD <LLD <LLD Sb- 124 Ci <LLD <LLD <LLD <LLD 1-131 Ci <LLD <LLD <LLD <LLD Cs- 134 Ci <LLD <LLD <LLD <LLD Cs- 137 Ci <LLD <LLD <LLD <LLD Ba\La- 140 Ci <LLD <LLD <LLD <LLD Ce- 141 Ci <LLD <LLD <LLD <LLD Ce- 144 Ci <LLD <LLD <LLD <LLD W- 187 Ci <LLD <LLD <LLD <LLD TOTAL Ci None None None None Xe- 131 m Ci <LLD <LLD <LLD <LLD Xe- 133 Ci <LLD <LLD <LLD <LLD Xe- 133m Ci <LLD <LLD <LLD <LLD Xe- 135 Ci <LLD <LLD <LLD <LLD Xe- 135m Ci <LLD <LLD <LLD <LLD TOTAL Ci None None None None"<" Indicates activity of sample is less than LLD given in uCi/mi LASALLE COUNTY NUCLEAR POWER STATION EFFLUENT AND WASTE DISPOSAL ANNUAL REPORT (2007)LIQUID RELEASES UNIT 1 and UNIT 2 CONTINUOUS MODE[Nuclides From Continuous Releases Units I 1st Qtr I 2nd Qtr I 3rd Qtr I 4th Qtr Gross Alpha Ci <I .00E-07 <1.00E-07

<1.00E-07

<1.00E-07 H-3 Ci <1.00E'05

<1.00E-05

<I.00E-05

<I .OOE-05 Cr-51 Ci <5.OOE-07

<5.OOE-07

<5.00E-07

<5.OOE-07 Mn-54 Ci <5.OOE-07

<5.OOE-07

<5.OOE-07

<5.OOE-07 Fe-55 (Estimate)

Ci <1.00E-06

<I .00E-06 <I.OOE-06

<I .00E-06 Co-58 Ci <5.OOE-07

<5.OOE-07

<5.OOE-07

<5.00E-07 Fe-59 Ci <5.OOE-07

<5.OOE-07

<5.OOE-07

<5.00E-07 Co-60 Ci <5.00E-07

<5.OOE-07

<5.OOE-07

<5.OOE-07 Zn-65 Ci <5.OOE-07

<5.OOE-07

<5.OOE-07

<5.OOE-07 Sr-89 (Estimate)

Ci <5.OOE-08

<5.OOE-08

<5.OOE-08

<5.OOE-08 Sr-90 (Estimate)

Ci <5.OOE-08

<5.OOE-08

<5.OOE-08

<5.OOE-08 Nb-95 Ci <5.00E-07

<5.OOE-07

<5.OOE-07

<5.OOE-07 Zr-95 Ci <5.OOE-07

<5.OOE-07

<5.OOE-07

<5.00E-07 Mo-99 Ci <5.OOE-07

<5.OOE-07

<5.OOE-07

<5.OOE-07 Tc-99m Ci <5.OOE-07

<5.OOE-07

<5.OOE-07

<5.OOE-07 Ag-I 10m Ci <5.OOE-07

<5.OOE-07

<5.OOE-07

<5.OOE-07 Sb- 122 Ci <5.OOE-07

<5.OOE-07

<5.OOE-07

<5.OOE-07 Sb-124 Ci <5.OOE-07

<5.OOE-07

<5.OOE-07

<5.OOE-07 1-131 Ci <1.00E-06

<I.00E-06

<1.00E-06

<1.00E-06 Cs- 134 Ci <5.OOE-07

<5.OOE-07

<5.OOE-07

<5.OOE-07 Cs- 137 Ci <5.OOE-07

<5.OOE-07

<5.OOE-07

<5.OOE-07 Ba\La-140 Ci <5.OOE-07

<5.OOE-07

<5.OOE-07

<5.OOE-07 Ce-141 Ci <5.OOE-07

<5.OOE-07

<5.OOE-07

<5.OOE-07 Ce-144 Ci <5.OOE-07

<5.OOE-07

<5.OOE-07

<5.OOE-07 W- 187 Ci <5.OOE-07

<5.OOE-07

<5.OOE-07

<5.OOE-07 TOTAL Ci <LLD <LLD <LLD <LLD Xe-131rm Ci <I.OOE-05

<I.00E-05

<I.OOE-05

<I.OOE-05 Xe-133 Ci <1.00E-05

<1.00E-05

<I.00E-05

<I.OOE-05 Xe-133m Ci <I.OOE-05

<1.00E-05

<l.00E-05

<I.OOE-05 Xe- 135 Ci <I.OOE-05

<l.OOE-05

<1.00E-05

<l.OOE-05 Xe-135m Ci <I .00E-05 < l.00E-05 <1.00E-05

<1.00E-05 TOTAL Ci <LLD <LLD <LLD <LLD"<" Indicates activity of sample is less than LLD given in uCi/ml EFFLUENT AND WASTE DISPOSAL ANNUAL REPORT (2007)SOLID WASTE AND IRRADIATED FUEL SHIPMENTS EFFLUENT AND WASTE DISPOSAL ANNUAL REPORT (2007)SOLID WASTE AND IRRADIATED FUEL SHIPMENTS FIRST QUARTER A. SOLID WASTE SHIPPED OFFSITE FOR BURIAL OR DISPOSAL 1. Spent resins, filter sludges, evaporator bottoms, etc.a. Quantity shipped cu.m. O.OOE+00 b. Total activity Ci 0.00E+00 c. Major nuclides (estimate

%) N/A d. Shipment type N/A 2. Dry compressible waste, contaminated equipment, etc.a. Quantity shipped cu.m. 2.74E+02 b. Total activity Ci 2.90E+00 c. Major nuclides (estimate

%)Co-60 7.1 2E+0 I Fe-55 1.97E+O1 Mn-54 6.06E+00 Ni-63 7.70E-0 1 Cs-137 4.13E-01 d. Shipment type LSA 3. Irradiated Components

a. Quantity shipped cu.m. 0.OOE+00 b. Total activity Ci 0.OOE+00 c. Major nuclides (estimate

%) N/A d. Shipment type N/A EFFLUENT AND WASTE DISPOSAL ANNUAL REPORT (2007)SOLID WASTE AND IRRADIATED FUEL SHIPMENTS FIRST QUARTER 4. Other a.b.C.d.Quantity shipped cu.m.Total activity Ci Major nuclides (estimate

%)Shipment type 0.OOE+00 0.OOE+00 N/A N/A 5. Solid Waste Disposition Number of Shipments Transportation Mode Destination I Truck ALARON Corporation 5 Truck Duratek -Bear Creek TOTAL THIS QUARTER 6 Estimated total error % for spent resins, filter sludges, evaporator bottoms, etc. (Jan-Mar) 2.50E+O I Estimated total error % for dry compressible waste, contaminated equipment, etc. (Jan-Mar) 2.50E+01 Estimated total error % for irradiated components (Jan-Mar)

N/A B. IRRADIATED FUEL SHIPMENTS None EFFLUENT AND WASTE DISPOSAL ANNUAL REPORT (2007)SOLID WASTE AND IRRADIATED FUEL SHIPMENTS SECOND QUARTER A. SOLID WASTE SHIPPED OFFSITE FOR BURIAL OR DISPOSAL 1. Spent resins, filter sludges, evaporator bottoms, etc.a. Quantity shipped cu.m. 7.88E+00 b. Total activity Ci 2.3 IE+01 c. Major nuclides (estimate

%)Fe-55 6.02E+01 Co-60 1.74E+01 Mn-54 1.29E+01 Cr-51 3.32E+00 Fe-59 2.65E+00 d. Shipment type e. Solidification agent 2. Dry compressible waste, contaminated equipment, etc.a. Quantity shipped cu.m.b. Total activity Ci c. Major nuclides (estimate

%)Co-60 Fe-55 Mn-54 H-3 Ni-63 LSA, Type A None 1.04E+02 3.25E-02 7.OOE+0 I 1.93E+01 5.93E+00 1.84E+00 7.57E-01 d. Shipment type LSA EFFLUENT AND WASTE DISPOSAL ANNUAL REPORT (2007)SOLID WASTE AND IRRADIATED FUEL SHIPMENTS SECOND QUARTER 3. Irradiated Components (CRD Blades, LPRM Strings, SRM's)a. Quantity shipped cu.m. 4.99E-01 b. Total activity Ci 5.75E+04 c. Major nuclides (estimate

%)Co-60 4.93E+01 Fe-55 4.45E+Ot Ni-63 3.66E+00 Mn-54 1.66E+00 Cr-51 3.65E-01 d. Shipment type Class C 4. Other a. Quantity shipped cu.m. 0.OOE+00 b. Total activity Ci 0.OOE+00 c. Major nuclides (estimate

%) N/A d. Shipment type N/A 5. Solid Waste Disposition Number of Shipments Transportation Mode Destination 3 Truck Barnwell Waste Management Facility 9 Truck Duratek-Bear Creek TOTAL THIS QUARTER 12 Estimated total error % for spent resins, filter sludges, evaporator bottoms, etc. (Apr-Jun) 2.50E+0 I Estimated total error % for dry compressible Waste, contaminated equipment, etc. (Apr-Jun) 2.50E+0 1 Estimated total error % for irradiated components (Apr-Jun) 2.50E+01 B. IRRADIATED FUEL SHIPMENTS None EFFLUENT AND WASTE DISPOSAL ANNUAL REPORT (2007)SOLID WASTE AND IRRADIATED FUEL SHIPMENTS THIRD QUARTER A. SOLID WASTE SHIPPED OFFSITE FOR BURIAL OR DISPOSAL 1. Spent resins, filter sludges, evaporator bottoms, etc.a. Quantity shipped cu.m. 6.73E+01 b. Total activity Ci 6.47E+01 c. Major nuclides (estimate

%)Fe-55 5.69E+01 Co-60 2.01E+01 Mn-54 1.22E+01 Cr-51 3.29E+00 Fe-59 2.57E+00 d. Shipment type LSA, Class A e. Solidification agent N/A 2. Dry compressible waste, contaminated equipment, etc.a. Quantity shipped cu.m. 3.28E+02 b. Total activity Ci 6.52E-02 c. Major nuclides (estimate

%)Co-60 6.94E+01 Fe-55 1.91E+01 Mn-54 5.77E+00 H-3 2.89E+00 Ni-63 7.53E-01 d.Shipment type LSA EFFLUENT AND WASTE DISPOSAL ANNUAL REPORT (2007)SOLID WASTE AND IRRADIATED FUEL SHIPMENTS THIRD QUARTER 3. Irradiated Components (CRD Blades, LPRM Strings, SRM's)a. Quantity shipped cu.m. 1.90E-01 b. Total activity Ci 2.56E+04 c. Major nuclides (estimate

%)Co-60 5.08E+0 I Fe-55 4.34E+01 Ni-63 3.59E+00 Mn-54 1.44E+00 Cr-51 2.19E-01 d.4. Other a.b.C.d.Shipment type Class C Quantity shipped cu.m.Total activity Ci Major nuclides (estimate

%)Shipment type 0.00E+00 0.00E+00 N/A N/A 5. Solid Waste Disposition Number of Shipments 8 1 4 11 Transportation Mode Truck Truck Truck Truck Destination Energy Solutions, LLC.(Containerized)

Barnwell Waste Management Facility Duratek-Gallaher Rd, TN Duratek -Bear Creek TOTAL THIS QUARTER 24 Estimated total error % for spent resins, filter sludges, evaporator bottoms, etc. (Jul-Sep) 2.50E+01 Estimated total error % for dry compressible waste, contaminated equipment, etc. (Jul-Sep) 2.50E+01.Estimated total error % for irradiated components (Jul-Sep) 2.50E+01 B. IRRADIATED FUEL SHIPMENTS None EFFLUENT AND WASTE DISPOSAL ANNUAL REPORT (2007)SOLID WASTE AND IRRADIATED FUEL SHIPMENTS FOURTH QUARTER A. SOLID WASTE SHIPPED OFFSITE FOR BURIAL OR DISPOSAL 1. Spent resins, filter sludges, evaporator bottoms, etc.a. Quantity shipped cu.m. 2.24E+01 b. Total activity Ci 1.65E+02 c. Major nuclides (estimate

%)Co-60 5.79E+01 Fe-55 3.19E+01 Cs- 137 4.78E+00 Ni-63 1.73E+00 Mn-54 1.48E+00'd. Shipment type LSA, Class A e. Solidification agent None 2. Dry compressible waste, contaminated equipment, etc.a. Quantity shipped cu.m. 2.99E+02 b. Total activity Ci 1.75E-01 c. Major nuclides (estimate

%)Co-60 7.06E+01 Fe-55 1.95E+01 Mn-54 5.96E+00 H-3 9.83E-01 Ni-63 7.64E-0 1 d. Shipment type LSA 3. Irradiated Components

a. Quantity shipped cu.m. 0.OOE+00 b. Total activity Ci 0.OOE+00 c. Major nuclides (estimate

%) N/A d. Shipment type N/A EFFLUENT AND WASTE DISPOSAL ANNUAL REPORT (2007)SOLID WASTE AND IRRADIATED FUEL SHIPMENTS FOURTH QUARTER 4. Other a.b.C.d.Quantity shipped cu.m.Total activity Ci Major nuclides (estimate

%)Shipment type 0.OOE+00 0.OOE+00 N/A N/A 5. Solid Waste Disposition Number of Shipments 7 5 1 Transportation Mode Truck Truck Truck Destination Duratek-Bear Creek Energy Solutions, LLC.(Containerized)

Studsvik Processing Facility, LLC.TOTAL THIS QUARTER 13 Estimated total error % for spent resins, filter sludges, evaporator bottoms, etc. (Oct-Dec) 2.50E+01 Estimated total error % for dry compressible waste, contaminated equipment, etc. (Oct-Dec) 2.50E+0 1 Estimated total error % for other irradiated components (Oct-Dec)

N/A B. IRRADIATED FUEL SHIPMENTS None EFFLUENT AND WASTE DISPOSAL ANNUAL REPORT (2007)RADIOLOGICAL IMPACT ON MAN MAXIMUM DOSES RESULTING FROM RELEASES AND COMPLIANCE STATUS AIRBORNE Effluents-IOCFR50 Listing 24-mar-2008 18:42:14 STATION: UNIT: PERIOD: NAME: REPORT: MODE: LASALLE STATION 1 01/01/07 12/31/07 ODCMLAS ANNUAL ACTUAL LASALLE STATION UNIT ONE ACTUAL 2007 MAXIMUM DOSES RESULTING FROM AIRBORNE RELEASES PERIOD OF RELEASE 1ST QUARTER JAN-MAR-01/01/07 TO 12/31/07 INFANT RECEPTOR CALCULATED 03/24/08 TYPE GAMMA AIR (MEAD)BETA AIR (MRAD)TOT. BODY (MREM)SKIN (MREM)ORGAN (MREM)1.22E-02 (WSW)3.63E-04 (ESE)9.20E-03 (WSW)9. 65E-03 (WSW)2 .32E-03 (ESE)2ND QUARTER APR-JUN 1.27E-02 (WSW)3.57E-04 (ESE)9.63E-03 (WSW)1.01E-02 (WSW)3.78E-02 (ESE)3RD QUARTER JUL-SEP 1.07E-02 (WSW)3.25E-04 (ESE)8.12E-03 (WSW)8.52E-03 (WSW)6.94E-02 (ESE)4TH QUARTER OCT-DEC 1.45E-02 (WSW)3.81E-04 (ESE)1.10E-02 (WSW)1.15E-02 (WSW)2.17E-02 (ESE )ANNUAL 5. 02E-02 (WSW)1. 43E-03 (ESE )3.79E-02 (WSW)3.98E-02 (WSW)1.31E-01 (ESE )THYROID THYROID THYROID THIS IS A REPORT FOR THE CALENDAR YEAR 2007 THYROID THYROID COMPLIANCE STATUS -10CFR 50 APP. I INFANT RECEPTOR-- % OF APP I.GAMMA AIR (MRAD)BETA AIR (MRAD)TOT. BODY (MREM)SKIN (MREM)ORGAN (MREM)QTRLY OBJ 5.0 10.0 2.5 7.5 7.5 1ST QTR JAN-MAR 0.24 0.00 0.37 0.13 0.03 2ND QTR APR-JUN 0.25 0.00 0.39 0.13 0.50 3RD QTR JUL-SEP 0.21 0.00 0.32 0.11 0.93 4TH QTR OCT-DEC 0.29 0.00 0.44 0.15 0.29 YRLY OBJ 10.0 20.0 5.0 15.0 15.0% OF APP. I 0.50 0.01 0.76 0.27 0.87 THYROID THYROID THYROID THYROID THYROID RESULTS BASED UPON: ODCM ANNEX REVISION 3.0 MAY 2001 ODCM SOFTWARE VERSION 1.1 January 1995 ODCM DATABASE VERSION 1.1 January 1995 LASALLE STATION UNIT ONE ACTUAL 2007 MAXIMUM DOSES RESULTING FROM AIRBORNE RELEASES PERIOD OF RELEASE IST QUARTER JAN-MAR-01/01/07 TO 12/31/07 CHILD RECEPTOR CALCULATED 03/24/08 TYPE GAMMA AIR (MRAD)BETA AIR (MRAD)TOT. BODY (MREM)SKIN (MREM)ORGAN (MREM)1.22E-02 (WSW)3. 63E-04 (ESE)9.20E-03 (WSW)9.65E-03 (WSW)1. 94E-03 (NNE)2ND QUARTER APR-JUN 1.27E-02 (WSW)3.57E-04 (ESE)9.63E-03 (WSW)1.01E-02 (WSW)4.22E-02 (NNE)3RD QUARTER JUL-SEP 1.07E-02 (WSW)3.25E-04 (ESE)8.12E-03 (WSW)8.52E-03 (WSW)7.71E-02 (NNE)4TH QUARTER OCT-DEC 1.45E-02 (WSW)3.81E-04 (ESE)1.10E-02 (WSW)1.15E-02 (WSW)2. 63E-02 (NNE)ANNUAL 5. 02E-02 (WSW)1 .43E-03 (ESE)3. 79E-02 (WSW)3. 98E-02 (WSW)1. 47E-01 (NNE)THYROID THYROID THYROID THIS IS A REPORT FOR THE CALENDAR YEAR 2007 THYROID THYROID COMPLIANCE STATUS -10CFR 50 APP. I CHILD RECEPTOR-- % OF APP I.GAMMA AIR (MIRAD)BETA AIR (M-RAD)TOT. BODY (MREM)SKIN (MREM)ORGAN (MREM)QTRLY OBJ 5.0 10.0 2.5 7.5 7.5 IST QTR JAN-MAR 0.24 0.00 0.37 0.13 0.03 2ND QTR APR- JUN 0.25 0.00 0.39 0.13 0.56 3RD QTR JUL-SEP 0.21 0.00 0.32 0.11 1.03 4TH QTR OCT-DEC 0.29 0.00 0.44 0.15 0.35 YRLY OBJ 10.0 20.0 5.0 15.0 15.0% OF APP. I 0.50 0.01 0.76 0.27 0.98 THYROID THYROID THYROID THYROID THYROID RESULTS BASED UPON: ODCM ANNEX REVISION 3.0 MAY 2001 ODCM SOFTWARE VERSION 1.1 January 1995 ODCM DATABASE VERSION 1.1 January 1995 LASALLE STATION UNIT ONE ACTUAL 2007 MAXIMUM DOSES RESULTING FROM AIRBORNE RELEASES PERIOD OF RELEASE-01/01/07 TO 12/31/07 TEENAGER RECEPTOR CALCULATED 03/24/08 TYPE GAMMA AIR (MRAD)BETA AIR (MRAD)TOT. BODY (MREM)SKIN (MREM)ORGAN (MREM)1ST QUARTER JAN-MAR 1.22E-02 (WSW)3.63E-04 (ESE)9.20E-03 (WSW)9.65E-03 (WSW)1.44E-03 (NNE)2ND QUARTER APR- JUN 1.27E-02 (WSW)3.57E-04 (ESE)9.63E-03 (WSW)1.01E-02 (WSW)2.60E-02 (NNE)3RD QUARTER JUL-SEP 1.07E-02 (WSW)3.25E-04 (ESE )8.12E-03 (WSW)8.52E-03 (WSW)4.73E-02 (NNE)4TH QUARTER OCT-DEC 1.45E-02 (WSW)3.81E-04 (ESE)1.10E-02 (WSW)1.15E-02 (WSW)1.64E-02 (NNE)ANNUAL 5.02E-02 (WSW)1. 43E-03 (ESE )3. 79E-02 (WSW )3. 98E-02 (WSW)9. 12E-02 (NNE)THYROID THYROID THYROID THIS IS A REPORT FOR THE CALENDAR YEAR 2007 THYROID THYROID COMPLIANCE STATUS -10CFR 50 APP. I TEENAGER RECEPTOR-- % OF APP I.GAMMA AIR (MRAD)BETA AIR (MRAD)TOT. BODY (MREM)SKIN (MREM)ORGAN (MREM)QTRLY OBJ 5.0 10.0 2.5 7.5 7.5 1ST QTR JAN-MAR 0.24 0.00 0.37 0.13 0.02 2ND QTR APR-JUN 0.25 0.00 0.39 0.13 0.35 3RD QTR 4TH QTR JUL-SEP OCT-DEC 0.21 0.29 0.00 0.00 0.32 0.44 0.11 0.15 0.63 0.22 YRLY OBJ 10.0 20.0 5.0 15.0 15.0% OF APP. I 0.50 0.01 0.76 0.27 0.61 THYROID THYROID THYROID THYROID THYROID RESULTS BASED UPON: ODCM ANNEX REVISION 3.0 MAY 2001 ODCM SOFTWARE VERSION 1.1 January 1995 ODCM DATABASE VERSION 1.1 January 1995 LASALLE STATION UNIT ONE ACTUAL 2007 MAXIMUM DOSES RESULTING FROM AIRBORNE RELEASES PERIOD OF RELEASE-01/01/07 TO 12/31/07 ADULT RECEPTOR CALCULATED 03/24/08 TYPE GAMMA AIR (MRAD)BETA AIR (MRAD)TOT. BODY (MREM)SKIN (MREM)ORGAN (MREM)IST QUARTER JAN-MAR 1.22E-02 (WSW)3.63E-04 (ESE )9.20E-03 (WSW)9.65E-03 (WSW)1.58E-03 (NNE)2ND QUARTER APR-JUN 1.27E-02 (WSW)3.57E-04 (ESE )9.63E-03 (WSW)1.01E-02 (WSW)2.67E-02 (NNE)3RD QUARTER JUL- SEP 1.07E-02 (WSW)3.25E-04 (ESE )8.12E-03 (WSW)8.52E-03 (WSW)4.85E-02 (NNE)4TH QUARTER OCT-DEC 1.45E-02 (WSW)3.81E-04 (ESE )1.10E-02 (WSW)1.15E-02 (WSW)1.67E-02 (NNE)5. 02E-02 (WSW)1.43E-03 (ESE )3. 79E-02 (WSW)3. 98E-02 (WSW)9. 35E-02 (NNE)ANNUAL THYROID THYROID THYROID THYROID THYROID THIS IS A REPORT FOR THE CALENDAR YEAR 2007 COMPLIANCE STATUS -10CFR 50 APP. I ADULT RECEPTOR-------------

% OF APP I.-------------

GAMMA AIR (MRAD)BETA AIR (MRAD)TOT. BODY (MREM)SKIN (MREM)ORGAN (MREM)QTRLY OBJ 5.0 10.0 2.5 7.5 7.5 1ST QTR JAN-MAR 0.24 0.00 0.37 0.13 0.02 2ND QTR APR-JUN 0.25 0.00 0.39 0.13 0.36 3RD QTR JUL-SEP 0.21 0.00 0.32 0.11 0.65 4TH QTR OCT-DEC 0.29 0.00 0.44 0.15 0.22 YRLY OBJ 10.0 20.0 5.0 15.0 15.0% OF APP. I 0.50 0.01 0.76 0.27 0.62 THYROID THYROID THYROID THYROID THYROID RESULTS BASED UPON: ODCM ANNEX REVISION 3.0 MAY 2001 ODCM SOFTWARE VERSION 1.1 January 1995 ODCM DATABASE VERSION 1.1 January 1995 AQUATIC Effluents-10CFR50 Listing 24-mar-2008 18:45:06 STATION: UNIT: PERIOD: NAME: REPORT: MODE: LASALLE STATION 1 01/01/07 12/31/07 ODCMLAS ANNUAL ACTUAL LASALLE STATION UNIT ONE MAXIMUM DOSES PERIOD OF RELEASE ACTUAL 2007 (MREM) RESULTING FROM AQUATIC EFFLUENTS-01/01/07 TO 12/31/07 CALCULATED 03/24/08 INFANT RECEPTOR DOSE TYPE TOTAL BODY INTERNAL ORGAN 1ST 2ND QUARTER QUARTER JAN-MAR APR-JUN 0.OOE+00 0.OOE+00 0.OOE+00 0.OOE+00 3RD QUARTER JUL-SEP 4TH QUARTER OCT-DEC ANNUAL 0.OOE+00 0.OOE+00 0.OOE+00 0.OOE+00 0.OOE+00 0.OOE+00 THIS IS A REPORT FOR THE CALENDAR YEAR 2007 COMPLIANCE STATUS -10 CFR 50 APP. I-----------------------

% OF APP I.QTRLY IST QTR 2ND QTR 3RD QTR 4TH QTR YRLY % OF OBJ JAN-MAR APR-JUN JUL-SEP OCT-DEC OBJ APP. I TOTAL BODY (MREM) 1.5 CRIT. ORGAN(MREM) 5.0 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 3.0 0.00 10.0 0.00 RESULTS BASED UPON: ODCM ANNEX REVISION 3.0 MAY 2001 ODCM SOFTWARE VERSION 1.1 January 1995 ODCM DATABASE VERSION 1.1 January 1995 LASALLE STATION UNIT ONE 2007 ANNUAL REPORT PROJECTED DOSE AT NEAREST COMMUNITY PERIOD OF RELEASE -01/01/07 TO 12/31/07 INFANT RECEPTOR WATER SYSTEM *CALCULATED 03/24/08 DOSE TYPE TOTAL BODY INTERNAL ORGAN 1ST QUARTER JAN-MAR 2ND QUARTER APR-JUN 3RD QUARTER JUL-SEP 4TH QUARTER OCT-DEC ANNUAL 0.OOE+00 0.OOE+00 0.OOE+00 0.OOE+00 0.OOE+00 0.00E+00 0.OOE+00 0.OOE+00 0.OOE+00 0.OOE+00 THIS IS A REPORT FOR THE CALENDAR YEAR 2007 COMPLIANCE STATUS -40 CFR 141 TYPE ANNUAL LIMIT TOTAL BODY INTERNAL ORGAN 4.0 MREM 4.0 MREM% OF LIMIT 0.000 0.000* THIS CALCULATION OF DOSE IS BASED ON TECHNIQUES DESCRIBED IN THE COMMONWEALTH EDISON OFFSITE DOSE CALCULATION MANUAL. THESE TECHNIQUES DIFFER FROM THOSE DESCRIBED IN 40 CFR 141.RESULTS BASED UPON: ODCM ANNEX REVISION 3.0 ODCM SOFTWARE VERSION 1.1 ODCM DATABASE VERSION 1.1 MAY 2001 January 1995 January 1995 LASALLE STATION UNIT ONE MAXIMUM DOSES PERIOD OF RELEASE ACTUAL 2007 (MREM) RESULTING FROM AQUATIC EFFLUENTS-01/01/07 TO 12/31/07 CALCULATED 03/24/08 CHILD RECEPTOR DOSE TYPE TOTAL BODY INTERNAL ORGAN 1ST QUARTER JAN-MAR 2ND QUARTER APR-JUN 3RD QUARTER JUL-SEP 4TH QUARTER OCT-DEC ANNUAL 0.OOE+00 0.OOE+00 0.OOE+00 0.OOE+00 0.OOE+00 0.OOE+00 0.OOE+00 0.OOE+00 0.OOE+00 0.OOE+00 THIS IS A REPORT FOR THE CALENDAR YEAR 2007 COMPLIANCE STATUS -10 CFR 50 APP. I-------------

% OF APP I.QTRLY 1ST QTR 2ND QTR 3RD QTR 4TH QTR YRLY % OF OBJ JAN-MAR APR-JUN JUL-SEP OCT-DEC OBJ APP. I TOTAL BODY (MREM) 1.5 CRIT. ORGAN(MREM) 5.0 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 3.0 0.00 10.0 0.00 RESULTS BASED UPON: ODCM ANNEX REVISION 3.0 MAY 2001 ODCM SOFTWARE VERSION 1.1 January 1995 ODCM DATABASE VERSION 1.1 January 1995 LASALLE STATION UNIT ONE 2007 ANNUAL REPORT PROJECTED DOSE AT NEAREST COMMUNITY WATER SYSTEM *CALCULATED 03/24/08 PERIOD OF RELEASE-01/01/07 TO 12/31/07 CHILD RECEPTOR DOSE TYPE TOTAL BODY INTERNAL ORGAN 1ST QUARTER JAN-MAR 2ND QUARTER APR-JUN 3RD QUARTER JUL-SEP 4TH QUARTER OCT-DEC ANNUAL 0.00E+00 0.OOE+00 0.OOE+00 0.00E+00 0.OOE+00 0.OOE+00 0.OOE+00 0.OOE+00 0.OOE+00 0.OOE+00 THIS IS A REPORT FOR THE CALENDAR YEAR 2007 COMPLIANCE STATUS -40 CFR 141 TYPE TOTAL BODY INTERNAL ORGAN ANNUAL LIMIT 4.0 MREM 4.0 MREM% OF LIMIT 0.000 0.000* THIS CALCULATION OF DOSE IS BASED ON TECHNIQUES DESCRIBED IN THE COMMONWEALTH EDISON OFFSITE DOSE CALCULATION MANUAL. THESE TECHNIQUES DIFFER FROM THOSE DESCRIBED IN 40 CFR 141.RESULTS BASED UPON: ODCM ANNEX REVISION ODCM SOFTWARE VERSION ODCM DATABASE VERSION 3.0 MAY 2001 1.1 January 1995 1.1 January 1995 LASALLE STATION UNIT ONE MAXIMUM DOSES PERIOD OF RELEASE ACTUAL 2007 (MREM) RESULTING FROM-01/01/07 TO 12/31/07 TEENAGER RECEPTOR AQUATIC EFFLUENTS CALCULATED 03/24/08 DOSE TYPE TOTAL BODY INTERNAL ORGAN 1ST QUARTER JAN-MAR 2ND QUARTER APR-JUN 3RD QUARTER JUL-SEP 4TH QUARTER OCT-DEC ANNUAL 0.OOE+00 0.00E+00 0.OOE+00 0.OOE+00 0.00E+00 0.OOE+00 0.OOE+00 0.OOE+00 0.OOE+00 0.OOE+00 THIS IS A REPORT FOR THE CALENDAR YEAR 2007 COMPLIANCE STATUS -10 CFR 50 APP. I-----------------------

% OF APP I.QTRLY 1ST QTR 2ND QTR 3RD QTR 4TH QTR YRLY % OF OBJ JAN-MAR APR-JUN JUL-SEP OCT-DEC OBJ APP. I TOTAL BODY (MREM) 1.5 CRIT. ORGAN(MREM) 5.0 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 3.0 0.00 10.0 0.00 RESULTS BASED UPON: ODCM ANNEX REVISION 3.0 MAY 2001 ODCM SOFTWARE VERSION 1.1 January 1995 ODCM DATABASE VERSION 1.1 January 1995 LASALLE STATION UNIT ONE 2007 ANNUAL REPORT PROJECTED DOSE AT NEAREST COMMUNITY WATER SYSTEM *CALCULATED 03/24/08 PERIOD OF RELEASE-01/01/07 TO 12/31/07 TEENAGER RECEPTOR DOSE TYPE TOTAL BODY INTERNAL ORGAN 1ST QUARTER JAN-MAR 2ND QUARTER APR-JUN 3RD QUARTER JUL-SEP 4TH QUARTER OCT-DEC ANNUAL 0.OOE+00 0.OOE+00 0.OOE+00 0.00E+00 0.OOE+00 0.OOE+00 0.OOE+00 0.00E+00 0.OOE+00 0.OOE+00 THIS IS A REPORT FOR THE CALENDAR YEAR 2007 COMPLIANCE STATUS -40 CFR 141 TYPE TOTAL BODY INTERNAL ORGAN ANNUAL LIMIT 4.0 MREM 4.0 MREM% OF LIMIT 0.000 0.000* THIS CALCULATION OF DOSE IS BASED ON TECHNIQUES DESCRIBED IN THE COMMONWEALTH EDISON OFFSITE DOSE CALCULATION MANUAL. THESE TECHNIQUES DIFFER FROM THOSE DESCRIBED IN 40 CFR 141.RESULTS BASED UPON: ODCM ANNEX REVISION ODCM SOFTWARE VERSION ODCM DATABASE VERSION 3.0 MAY 2001 1.1 January 1995 1.1 January 1995 LASALLE STATION UNIT ONE ACTUAL 2007 MAXIMUM DOSES (MREM) RESULTING FROM PERIOD OF RELEASE -01/01/07 TO 12/31/07 ADULT RECEPTOR AQUATIC EFFLUENTS CALCULATED 03/24/08 DOSE TYPE TOTAL BODY INTERNAL ORGAN 1ST QUARTER JAN-MAR 2ND QUARTER APR-JUN 3RD QUARTER JUL-SEP 4TH QUARTER OCT-DEC ANNUAL 0.OOE+00 0.OOE+00 0.OOE+00 0.OOE+00 0.OOE+00 0.OOE+00 0.OOE+00 0.OOE+00 0.OOE+00 0.OOE+00 THIS IS A REPORT FOR THE CALENDAR YEAR 2007 COMPLIANCE STATUS -10 CFR 50 APP. I-------------

% OF APP I.-------------

QTRLY 1ST QTR 2ND QTR 3RD QTR 4TH QTR YRLY % OF OBJ JAN-MAR APR-JUN JUL-SEP OCT-DEC OBJ APP. I TOTAL BODY (MREM) 1.5 CRIT. ORGAN(MREM) 5.0 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 3.0 0.00 10.0 0.00 RESULTS BASED UPON: ODCM ANNEX REVISION 3.0 MAY 2001 ODCM SOFTWARE VERSION 1.1 January 1995 ODCM DATABASE VERSION 1.1 January 1995 LASALLE STATION UNIT ONE 2007 ANNUAL REPORT PROJECTED DOSE AT NEAREST COMMUNITY WATER SYSTEM *CALCULATED 03/24/08 PERIOD OF RELEASE-01/01/07 TO 12/31/07 ADULT RECEPTOR DOSE TYPE TOTAL BODY INTERNAL ORGAN 1ST QUARTER JAN-MAR 2ND QUARTER APR-JUN 3RD QUARTER JUL-SEP 4TH QUARTER OCT-DEC ANNUAL 0.OOE+00 0.OOE+00 0.OOE+00 0.OOE+00 0.OOE+00 0.OOE+00 0.OOE+00 0.OOE+00 0.OOE+00 0.OOE+00 THIS IS A REPORT FOR THE CALENDAR YEAR 2007 COMPLIANCE STATUS -40 CFR 141 TYPE TOTAL BODY INTERNAL ORGAN ANNUAL LIMIT 4.0 MREM 4.0 MREM% OF LIMIT 0.000 0.000* THIS CALCULATION OF DOSE IS BASED ON TECHNIQUES DESCRIBED IN THE COMMONWEALTH EDISON OFFSITE DOSE CALCULATION MANUAL. THESE TECHNIQUES DIFFER FROM THOSE DESCRIBED IN 40 CFR 141.RESULTS BASED UPON: ODCM ANNEX REVISION 3.0 MAY 2001 ODCM SOFTWARE VERSION 1.1 January 1995 ODCM DATABASE VERSION 1.1 January 1995 24-mar-2008 18:44:16 Total Effective Dose Equivalent

-10CFR20 Listing STATION: LASALLE STATION UNIT: 1 PERIOD: 01/01/07 12/31/07 NAME: ODCMLAS REPORT: ANNUAL MODE: ACTUAL For ADULT dose calculations, the included pathways are: INHALATION MILK PRODUCE VEGETABLES MEAT GROUND DEPOSITION FISH WATER SKYSHINE WHOLE BODY Airborne Effluents are complete from 01/01/07 to 12/31/07 Aquatic Effluents are complete from 01/01/07 to 12/31/07 Skyshine entries are complete from 01/01/07 to 12/31/07 LASALLE STATION UNIT ONE 10 CFR 20 COMPLIANCE ASSESSMENT PERIOD OF ASSESSMENT 01/01/07 TO 12/31/07 CALCULATED 03/24/08 1. 10 CFR 20.1301 (a) (1) Compliance Total Effective Dose Eqivalent, mrem/yr 10 CFR 20.1301 (a) (1) limit mrem/yr 3. 95E-01 100.0 0.39% of limit Compliance Summary -10CFR20 ist Qtr 2nd Qtr 3rd Qtr 4th Qtr% of Limit 0.39 TEDE 9.79E-02 9.95E-02 1.OlE-01 9.66E-02 RESULTS BASED UPON: ODCM ANNEX REVISION ODCM SOFTWARE VERSION ODCM DATABASE VERSION 3.0 MAY 2001 1.1 January 1995 1.1 January 1995 LASALLE STATION UNIT ONE 10 CFR 20 COMPLIANCE ASSESSMENT PERIOD OF ASSESSMENT 01/01/07 TO 12/31/07 CALCULATED 03/24/08 2. 10 CFR 20.1301 (d)/40 CFR 190 Compliance Whole Body (DDE)Dose (mrem)Plume 3.79E-02 Skyshine 3.43E-01 Ground 7.25E-04 Total 3.82E-01 Limit % of (mrem) Limit Organ Dose (CDE)Thyroid Gonads Breast Lung Marrow Bone Remainder CEDE 8. 22E-02 1. 08E-02 1. 08E-02 1. 08E-02 1. 08E-02 1.08E-02 1. 09E-02 1.30E-02 25.0 75.0 25.0 25.0 25.0 25.0 25.0 25.0 1.53 0.11 0 .04 0. 04 0. 04 0. 04 0. 04 0. 04 TEDE 3.95E-01 100.0 0.39 RESULTS BASED UPON: ODCM ODCM ODCM ANNEX REVISION 3.0 MAY 2001 SOFTWARE VERSION 1.1 January 1995 DATABASE VERSION 1.1 January 1995 24-mar-2008 18:46:59 Total Effective Dose Equivalent

-10CFR20 Listing STATION: LASALLE STATION UNIT: 2 PERIOD: 01/01/07 12/31/07 NAME: ODCMLAS REPORT: ANNUAL MODE: ACTUAL For ADULT dose calculations, the included pathways are: INHALATION MILK PRODUCE VEGETABLES MEAT GROUND DEPOSITION FISH WATER SKYSHINE WHOLE BODY Airborne Effluents are complete from to Aquatic Effluents are complete from to Skyshine entries are complete from 01/01/07 to 12/31/07 LASALLE STATION UNIT TWO 10 CFR 20 COMPLIANCE ASSESSMENT PERIOD OF ASSESSMENT 01/01/07 TO 12/31/07 CALCULATED 03/24/08 1. 10 CFR 20.1301 (a) (1) Compliance Total Effective Dose Eqivalent, mrem/yr 10 CFR 20.1301 (a)(1) limit mrem/yr 3.31E-01 100.0 0.33% of limit Compliance Summary -10CFR20 1st Qtr 2nd Qtr 3rd Qtr 4th Qtr% of Limit 0.33 TEDE 6.50E-02 8.85E-02 8.76E-02 9.02E-02 RESULTS BASED UPON: ODCM ANNEX REVISION 3.0 MAY 2001 ODCM SOFTWARE VERSION 1.1 January 1995 ODCM DATABASE VERSION 1.1 January 1995 LASALLE STATION UNIT TWO 10 CFR 20 COMPLIANCE ASSESSMENT PERIOD OF ASSESSMENT 01/01/07 TO 12/31/07 CALCULATED 03/24/08 2. 10 CFR 20.1301 (d)/40 CFR 190 Compliance Whole Body (DDE)Organ Dose (CDE)Plume Skyshine Ground Total Thyroid Gonads Breast Lung Marrow Bone Remainder Dose (mrem)0. OOE+00 3.31E-01 0. OOE+00 3.31E-01 0. OOE+00 0 OOE+00 0. OOE+00 0. OOE+00 0. OOE+00 0. OOE+00 0. OOE+00 0. OOE+00 25.0 75.0 25.0 25.0 25.0 25.0 25.0 25.0 1.33 0.00 0.00 0.00 0.00 0.00 0.00 0.00 Limit % of (mrem) Limit CEDE TEDE 3.31E-01 100.0 0.33 RESULTS BASED UPON: ODCM ODCM ODCM ANNEX REVISION 3.0 MAY 2001 SOFTWARE VERSION 1.1 January 1995 DATABASE VERSION 1.1 January 1995 EFFLUENT AND WASTE DISPOSAL ANNUAL REPORT (2007)METEOROLOGICAL DATA LaSalle County Generating Station Period of Record: January -March 2007 Stability Class -Extremely Unstable -200Ft-33Ft Delta-T (F)Winds Measured at 33 Feet Wind Speed (in mph)Wind Direction 1-3 4-7 8-12 13-18 19-24 > 24 Total N 0 4 13 2 0 0 19 NNE 0 8 12 3 2 0 25 NE 0 1 10 20 6 2 39 ENE 0 3 4 24 3 1 35 E 1 7 5 15 17 2 47 ESE 0 3 5 22 4 2 36 SE 0 0 6 1 3 0 10 SSE 0 0 4 1 1 0 6 S 0 0 1 5 0 0 6 SSW 0 1 6 7 5 1 20 SW 0 3 8 12 7 0 30 WSW 0 2 4 7 9 0 22 W 0 1 11 13 12 1 38 WNW 0 1 10 16 16 4 47 NW 0 1 15 6 4 0 26 NNW 0 3 23 13 0 0 39 Variable 0 0 0 0 0 0 0 Total 1 38 137 167 89 13 445 Hours of calm in this stability class: 0 Hours of missing wind measurements in this stability class: 0 Hours of missing stability measurements in all stability classes: 3 LaSalle County Generating Station Period of Record: January -March 2007 Stability Class -Moderately Unstable -200Ft-33Ft Delta-T (F)Winds Measured at 33 Feet Wind Speed (in mph)Wind Direction N NNE NE ENE E ESE SE SSE S SSW SW WSW W WNW NW NNW Variable 1-3 4-7 8-12 13-18 19-24 > 24 Total 2 1 1 1 3 3 0 0 1 3 8 6 10 7 7 10 0 1 0 2 1 0 2 1 0 0 0 1 3 3 21 2 0 0 5 9 11 4 4 6 5 0 2 10 15 14 23 38 15 16 0 Total 1 3 65 63 37 8 177 Hours of calm in Hours of missing this stability class: 0 wind measurements in this stab)ility class: 0 stability classes: Hours of missing stability measurements in all 3 LaSalle County Generating-Station Period of Record: January -March 2007 Stability Class -Slightly Unstable Winds Measured at-200Ft-33Ft 33 Feet Delta-T (F)Wind Direction N NNE NE ENE Wind Speed (in mph)1-3 4-7 8-12 13-18 19-24 > 24 Total E ESE SE SSE S SSW SW WSW 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 2 0 0 1 0 0 1 0 1 2 2 1 2 5 1 2 2 3 1 0 9 5 7 2 0 0 5 3 7 5 1 1 3 5 5 6 2 0 4 3 2 2 0 1 0 0 1 2 6 0 10 0 9 0 11 0 10 0 0 6 5 0 0 3 2 0 13 0 12 0 15 4 15 0 38 1 34 0 12 W WNW NW NNW Variable Total 2 12 18 3 1 0 0 7 5 1 0 3 20 5 3 0 1 0 0 0 0 4 0 0 16 64 70 44 5 199 Hours of calm in this stability class: 0 Hours of missing wind measurements in this stability class: 0 Hours of missing stability measurements in all stability classes: 3 LaSalle County Generating Station Period of Record: January -March 2007 Stability Class -Neutral Winds Measured at Wind Speed Wind-200Ft-33Ft Delta-T (F)33 Feet (in mph)Direction N NNE NE ENE E ESE SE SSE S SSW SW WSW W WNW NW NNW Variable 1-3 4-7 8-12 13-18 19-24 > 24 Total 7 4 11 9 18 10 2 9 7 8 24 11 26 33 29 23 0 10 1 3 10 17 7 11 4 4 21 32 16 27 43 19 10 0 1 0 0 0 13 3 0 2 3 14 14 3 6 34 1 7 0 0 0 0 0 8 0 0 0 0 1 0 11 8 5 0 0 0 22 10 15 23 59 27 17 22 17 48 74 47 68 117 50 45 0 Total 6 55 231 235 101 33 661 Hours of calm in this stability class: 0 Hours of missing wind measurements in this stability class: 2 Hours of.missing stability measurements in all stability classes: 3 LaSalle County Generating Station Period of Record: January -March 2007 Stability Class -Slightly Stable Winds Measured at-200Ft-33Ft Delta-T (F)33 Feet Wind Speed (in mph)Wind Direction N NNE NE ENE E ESE SE SSE S SSW SW WSW W WNW NW NNW Variable 1-3 4-7 8-12 13-18 19-24 > 24 7 3 2 0 0 7 2 0 0 0 0 4 0 0 0 1 5 0 0 0 2 11 0 0 0 4 4 3 0 0 1 2 0 0 0 3 2 5 2 0 4 4 12 8 2 2 10 25 14 2 6 20 26 12 2 2 16 4 3 0 7 22 10 1 0 9 28 15 7 0 11 26 7 0 0 1 7 1 0 0 0 0 0 0 0 Total 13 11 4 6 13 11 3 12 30 53 67 27 41 61 44 9 0 Total 9 67 166 stability class: 110 47 6 405 Hours of calm in this Hours of missing wind 0 measurements in this stab)ility class: 0 stability classes: Hours of missing stability measurements in all 3 LaSalle County Generating Station Period of Record: January -March 2007 Stability Class -Moderately Stable Winds Measured at-200Ft-33Ft Delta-T (F)33 Feet Wind Speed (in mph)Wind Direction N NNE NE ENE E ESE 1-3 0 0 0 0 0 0 4-7 8-12 13-18 19-24 > 24 Total 0 0 1 0 0 0 0 0 1 0 2 3 SE SSE S SSW SW WSW W WNW NW 0 0 0 0 0 0 2 14 4 2 2 4 3 7 0 0 0 0 0 0 1 1 2 3 4 2 8 4 0 0 0 0 0 0 0 0 0 0 0 0 2 0 0 0 0 0 0 0 2 0 0 0 0 0 0 2 0 0 0 17 2 3 0 0 0 9 7 7 11 8 7 0 14 0 22 0 17 0 32 0 42 0 19 0 12 12 0 17 21 0 0 0 5 14 3 0 0 0 0 0 3 Variable Total 0 0 63 99 25 0 189 Hours of calm in this stability class: 0 Hours of missing wind measurements in this stabi lity class: 0 Hours of missing stability measurements in all stability classes: 3 LaSalle County Generating Station Period of Record: January -March 2007 Stability Class -Extremely Stable Winds Measured at-200Ft-33Ft Delta-T (F)33 Feet Wind Speed (in mph)Wind Direction N NNE NE ENE E ESE SE SSE S SSW SW WSW W WNW NW NNW Variable 1-3 0 0 0 0 0 0 0 0 0 4-7 8-12 13-18 19-24 > 24 Total 4 1 0 0 0 0 2 5 1 0 0 0 0 0 0 1 5 3 0 0 0 0 0 0 0 0 0 1 7 0 1 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 4 1 0 0 0 0 3 0 10 0 4 0 0 0 0 0 0 0 0 0 10 7 12 0 11 0 26 4 5 0 0 0 0 3 4 2 1 0 0 0 7 0 10 0 0 0 0 2 1 0 0 Total 0 29 41 9 0 79 0 Hours of calm inthis stability class: 0 Hours of missing wind measurements in this stability class: Hours of missing stability measurements in all stability classes: 3 LaSalle County Generating Station Period of Record: January -Stability Class -Extremely Unstable Winds Measured at 375 March 2007-375Ft-33Ft Delta-T (F)Feet Wind Speed (in mph)Wind Direction N NNE NE ENE E ESE SE SSE S SSW SW 1-3 0 0 0 0 0 0 0 0 0 0 0 4-7 8-12 13-18 19-24 ' > 24 Total 0 0 0 0 1 1 0 1 0 0 0 1 0 0 1 0 0 0 0 2 1 1 1 2 5 5 8 4 1 1 1 1 0 0 0 7 0 0 7 WSW W WNW 0 0 0 0 0 0 0 0 1 0 1 0 0 2 2 0 2 3 2 0 0 0 2 2 0 0 0 0 0 0 0 1 9 12 4 7 NNW Variable 2 0 Total 5 14 9 26 56 Hours of calm in this stability class: 0 Hours of missing wind measurements in this stability class: 3 Hours of missing stability measurements in all stability classes: 8 LaSalle County Generating Station Period of Record: January -Stability Class -Moderately Unstable Winds Measured at 375 March 2007-375Ft-33Ft Delta-T (F)Feet Wind Speed (in mph)Wind Direction N NNE NE 1-3 0 0 0 4-7 8-12 13-18 19-24 > 24 Total 0 0 0 1 4 0 5 2 3 0 1 3 0 0 6 7 7 1 ENE 0 0 1 11 0 13 E ESE SE SSE S SSW SW WSW W WNW NW NNW Variable.Total 3 4 0 0 0 0 8 5 2 1 2 3 1 3 0 0 0 0 0 6 5 0 8 6 7 0 1 11 38 24 12 86 Hours of calm in this stability class: 0 Hours of missing wind measurements in this stability class: 24 Hours of missing stability measurements in all stability classes: 8 LaSalle County Generating Station Period of Record: January -March 2007 Stability Class -Slightly Unstable -375Ft-33Ft Delta-T (F)Winds Measured at 375 Feet Wind Speed (in mph)Wind Direction 1-3 4-7 8-12 13-18 19-24 > 24 Total N 0 0 1 1 0 0 2 NNE 0 0 4 1 0 1 6 NE 0 0 0 2 1 8 11 ENE 0 0 0 0 3 0 3 E 0 1 1 0 2 6 10 ESE 0 0 3 3 5 5 16 SE 0 0 1 1 0 0 2 SSE 0 0 0 0 0 0 0 S 0 0 0 1 0 0 1 SSW 0 0 1 4 2 6 13 SW 0 0 1 1 0 1 3 WSW 0 0 0 2 3 2 7 W 0 0 2 7 12 1 22 WNW 0 0 1 8 4 1 14 NW 0 0 2 11 1 3 17 NNW 0 0 5 3 0 0 8 Variable 0 0 0 0 0 0 0 Total 0 1 22 45 33 34 135 Hours of calm in this stability class: 0 Hours of missing wind measurements in this stability class: 19 Hours of missing stability measurements in all stability classes: 8 LaSalle County Generating Station Period of Record: January -March 2007 Stability Class -Neutral -375Ft-33Ft Delta-T (F)Winds Measured at 375 Feet Wind Speed (in mph)Wind Direction N NNE NE ENE E ESE SE SSE S SSW SW WSW W WNW NW NNW Variable 1-3 4-7 8-12 13-18 19-24 > 24 Total 3 10 3 7 3 8 7 8 6 9 7 4 7 11 12 4 0 19 20 18 18 15 25 9 3 13 9 15 12 42 27 38 16 0 4 1 13 9 13 15 4 3 4 26 35 22 37 54 34 8 0 9 5 12 4 36 8 7 3 9 34 30 33 32 60 20 0 0 37 41 50 38 68 60 31 18 35 81 90 73 121 155 109 30 0 Total 2 43 109 299 282 302 1037 Hours of calm in this stability class: 0 Hours of missing wind measurements in this stability class: 21 Hours of missing stability measurements in all stability classes: 8 LaSalle County Generating Station Period of Record: January -Stability Class -Slightly Stable Winds Measured at 375 March 2007-375Ft-33Ft Delta-T (F)Feet Wind Speed (in mph)Wind Direction N NNE NE ENE E ESE SE SSE S SSW SW WSW W WNW NW NNW Variable Total 1-3 0 1 0 0 0 4-7 8-12 13-18 19-24 > 24 Total 2 1 0 1 0 5 1 1 0 0 1 3 4 3 3 7 7 2 4 3 5 1 0 0 1 4 23 0 11 0 0 0 3 5 4 4 16 3 2 4 2 1 2 5 27 6 13 8 16 3 19 29 5 66 77 2 6 14 56 78 1 13 19 12 46 9 16 10 23 60 5 13 23 58 101 3 25 21 16 67 0 1 7 9 0 0 0 0 2 13 48 120 9 0 130 1 27 0 0 274 587 Hours of calm in this stability class: 0 Hours of missing wind measurements in this si Hours of missing stability measurements intability class: 1 11 stability classes: 8 LaSalle County Generating Station Period of Record: January -March 2007 Stability Class -Moderately Stable -375Ft-33Ft Delta-T (F)Winds Measured at 375 Feet Wind Speed (in mph)Wind Direction 1-3 4-7 8-12 13-18 19-24 > 24 Total N 0 1 3 0 1 1 6 NNE 0 0 1 0 0 0 1 NE 0 0 1 0 0 0 1 ENE 0 0 0 1 0 0 1 E 0 0 0 0 0 0 0.ESE 0 0 0 0 1 2 3 SE 0 0 0 0 2 2 4 SSE 0 0 0 1 1 4 6 S 0 0 1 5 2 3 11 SSW 0 1 1 7 1 9 19 SW 0 0 0 3 4 11 18 WSW 0 0 1 2 5 4 12 W 0 2 9 2 7 0 20 WNW 0 1 1 0 9 7 18 NW 1 0 0 1 5 2 9 NNW 0 0 4 6 10 0 20 Variable 0 0 0 0 0 0 0 Total 1 5 22 28 48 45 149 Hours of calm in this stability class: 0 Hours of missing wind measurements in this stability class: 0 Hours of missing stability measurements in all stability classes: 8 LaSalle County Generating Station Period of Record: January -March 2007 Stability Class -Extremely Stable -375Ft-33Ft Delta-T (F)Winds Measured at 375 Feet Wind Speed (in mph)Wind Direction 1-3 4-7 8-12 13-18 19-24 > 24 Total N 0 0 0 0 0 0 0 NNE 0 0 0 0 0 0 0 NE 0 0 0 0 0 0 0 ENE 0 0 0 0 0 0 0 E 0 0 0 0 0 0 0 ESE 0 0 0 0 0 0 0 SE 0 0 0 0 0 0 0 SSE 0 0 0 1 0 1 2 S 0 0 1 0 3 8 12 SSW 0 0 1 0 0 2 3 SW 0 0 0 1 0 4 5 WSW 0 0 0 1 0 10 11 W 0 0 0 1 0 0 1 WNW 0 0 0 0 0 0 0 NW 0 0 0 0 0 0 0 NNW 0 0 0 0 0 0 0 Variable 0 0 0 0 0 0 0 Total 0 0 2 4 3 25 34 Hours of calm in this stability class: 0 Hours of missing wind measurements in this stability class: 0 Hours of missing stability measurements in all stability classes: 8 LaSalle County Generating Station Period of Record: April -June 2007 Stability Class -Extremely Unstable -200Ft-33Ft Delta-T (F)Winds Measured at 33 Feet Wind Direction N NNE NE ENE E ESE SE SSE S SSW SW WSW W WNW NW NNW Variable Wind Speed (in mph)1-3 4-7 8-12 13-18 19-24 > 24 Total 0 0 0 0 3 0 0 0 1 10 0 0 0 0 0 0 0 0 0 3 4 8 0 0 1 7 21 12 13 5 9 5 2 0 Total 0 2 11 32 31 14 90 Hours of calm in this stability class: Hours of missing wind measurements in this Hours of missing stability measurements in 0 stability class: 0 all stability classes: 3 LaSalle County Generating Station Period of Record: April -June 2007 Stability Class -Moderately Unstable -200Ft-33Ft Delta-T (F)Winds Measured at 33 Feet Wind Speed (in mph)Wind Direction 1-3 4-7 8-12 13-18 19-24 > 24 Total N 0 0 0 0 0 0 0 NNE 0 0 3 0 0 0 3 NE 0 0 0 7 0 0 7 ENE 0 0 1 4 0 2 7 E 0 0 1 0 0 1 2 ESE 0 0 0 0 0 0 0 SE 0 0 2 1 0 0 3 SSE 0 0 0 2 0 0 2 S 0 0 1 8 2 2 13 SSW 0 0 2 6 3 2 13 SW 0 0 6 1 0 1 8 WSW 0 0 1 8 1 0 10 W 0 1 2 5 0 0 8 WNW 0 0 13 8 5 0 26 NW 0 0 3 8 0 0 11 NNW 0 0 1 0 0 0 1 Variable 0 0 0 0 0 0 0 Total 0 1 36 58 11 8 114 Hours of calm in this stability class: 0 Hours of missing wind measurements in this stability class: 0 Hours of missing stability measurements in all stability classes: 3 LaSalle County Generating Station Period of Record: April -June 2007 Stability Class -Slightly Unstable Winds Measured at-200Ft-33Ft Delta-T (F)33 Feet Wind Speed (in mph)Wind Direction N NNE NE ENE E ESE SE SSE S SSW SW WSW W WNW NW NNW Variable 1-3 4-7 8-12 13-18 19-24 > 24 Total 0 1 7 4 0 1 0 5 11 3 3 4 4 19 2 2 0 4 6 15 15 4 4 2 12 25 5 15 11 7 31 16 8 0 Total 0 22 65 66 22 5 180 Hours of calm in this stability class: Hours of missing wind measurements in this Hours of missing stability measurements in 0 stability class: all stability cl 0 asses: 3 LaSalle County Generating Station Period of Record: April -June 2007 Stability Class -Neutral Winds Measured at-200Ft-33Ft Delta-T (F)33 Feet Wind Speed (in mph)Wind Direction N NNE NE ENE E ESE SE SSE S SSW SW WSW W WNW NW NNW Variable 1-3 4-7 8-12 13-18 19-24 > 24 Total 22 19 15 25 15 10 9 4 2 8 4 8 6 14 4 5*0 11 24 20 26 28 23 21 5 17 16 21 12 15 31 29 9 0 1 1 27 23 44 15 9 5 8 5 7 7 11 21 21 34 0 0 0 1 11 10 4 1 0 3 10 3 5 5 18 9 5 0 35 45 63 94 101 58 40 14 32 40 40 33 38 93 63 53 0 Total 4 170 308 239 85 36 842 Hours of calm in this stability class: 0 Hours of missing wind measurements in this stability class: 0 Hours of missing stability measurements in all stability classes: 3 LaSalle County Generating Station Period of Record: April -June 2007 Stability Class -Slightly Stable -200Ft-33Ft Delta-T (F)Winds Measured at 33 Feet Wind Speed (in mph)Wind Direction 1-3 4-7 8-12 13-18 19-24 > 24 Total N NNE NE ENE E ESE SE SSE 2 14 1 23 2 9 7 0 0 6 6 2 0 8 3 34 0 20 56 17 1 11i 0 2 0 9 1 3 4 6 6 4 4 0 0 0 0 7 3 0 0 7 8 2 0 5 0 18 0 33 0 23 0 43 0 100 0 24 0 17 0 13 0 33 0 37 0 44 1 21 1 37 6 10 10 SSW SW WSW W 0 8 11 10 2 10 14 16 0 9 8 2 10 17 WNW NW NNW Variable Total 1 13 3 10 0 0 1 0 8 9 7 0 205 3 2 6 2 0 0 0 0 0 0 17 45 0 24 0 0 8 0 16 156 92 32 19 520 Hours of calm in Hours of missing Hours of missing this stability class: wind measurements in this stability measurements in 0 stability class: 0 all stability classes: 3 LaSalle County Generating Station Period of Record: April -June 2007 Stability Class -Moderately Stable Winds Measured at-200Ft-33Ft Delta-T (F)33 Feet Wind Speed (in mph)Wind Direction 1-3 4-7 8-12 13-18 19-24 > 24 Total N NNE NE ENE E ESE SE SSE 1 0 0 1 8 4 2 1 1 0 0 0 7 0 13 0 9 7 1 12 10 1 16 10 0 0 0 0 1 2 0 0 3 3 2 1 0 S SSW SW WSW 1 0 1 9 4 5 9 5 8 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 21 0 18 0 23 0 27 0 22 0 0 0 4 2 2 0 10 0 0 12 16 3 10 10 0 24 W 0 5 WNW 0 15 2 10 2 1 1 0 0 0 7 0 0 0 16 0 13 0 10 NNW Variable Total 2 0 8 0 0 0 0 0 13 131 71 12 0 227 Hours of calm in Hours of missing Hours of missing this stability class: wind measurements in this stability measurements in 0 stability class: 0 all stability classes: 3 LaSalle County Generating Station Period of Record: April -June 2007 Stability Class -Extremely Stable -200Ft-33Ft Delta-T (F)Winds Measured at 33 Feet Wind Speed (in mph)Wind Direction N NNE NE ENE E ESE SE SSE S SSW SW WSW W WNW NW NNW Variable 1-3 4-7 8-12 13-18 19-24 > 24 Total 3 0 0 0 5 8 12 18 14 7 4 3 14 14 7 3 0 0 0 0 0 1 2 5 18 18 13 21 8 1 0 1 2 0 90 3 0 0 1 8 11 18 36 33 20 25 11 15 14 8 5 0 Total 6 112 0 0 0 208 Hours of calm in this stability class: Hours of missing wind measurements in this Hours of missing stability measurements in 0 stability class: 0 all stability classes: 3 LaSalle County Generating Station Period of Record: April -June 2007 Stability Class -Extremely Unstable -375Ft-33Ft Delta-T (F)Winds Measured at 375 Feet Wind Speed (in mph)Wind Direction N NNE NE ENE E ESE SE SSE S SSW SW WSW W WNW NW NNW Variable Total 1-3 4-7 8-12 13-18 19-24 > 24 Total 6 6 Hours of calm in this stability class: 0 Hours of missing wind measurements in this stability class: 0 Hours of missing stability measurements in all stability classes: 3 LaSalle County Generating Station Period of Record: April -June 2007 Stability Class -Moderately Unstable -375Ft-33Ft Delta-T (F)Winds Measured at 375 Feet Wind Speed (in mph)Wind Direction N NNE NE ENE E ESE SE SSE S SSW SW WSW W WNW NW NNW Variable 1-3 4-7 8-12 13-18 19-24 > 24 Total Total 0 0 0 2 3 13 18 Hours of calm in this stability class: 0 Hours of missing wind measurements in this stability class: 0 Hours of missing stability measurements in all stability classes: 3 LaSalle County Generating Station Period of Record: April -June 2007 Stability Class -Slightly Unstable -375Ft-33Ft Delta-T (F)Winds Measured at 375 Feet Wind Speed (in mph)Wind Direction 1-3 4-7 8-12 13-18 19-24 > 24 Total N 0 NNE 0 NE 0 ENE 0 E 0 ESE 0 SE 0 SSE 0 S 0 SSW 0 SW 0 WSW 0 W 0 WNW 0 NW 0 NNW 0 Variable 0 0 0 0 1 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 1 0 2 0 2 0 0 0 0 0 0 0 2 0 2 0 0 0 0 3 0 5 1 1 1 3 1 0 0 4 6 3 4 0 0 0 6 10 7 7 4 4 9 2 0 Total 0 0 6 19 26 15 66 Hours of calm in this stability class: 0 Hours of missing wind measurements in this stability class: 0 Hours of missing stability measurements in all stability classes: 3 LaSalle County Generating Station Period of Record: April -June 2007 Stability Class -Neutral -375Ft-33Ft Delta-T (F)Winds Measured at 375 Feet Wind Direction N NNE NE ENE E ESE SE SSE S SSW SW WSW W WNW NW NNW Var iablie Wind Speed (in mph)8-12 13-18 19-24 > 24 Total 1-3 4-7 3 8 13 12 7 6 6 1 0 1 5 3 3 12 5 1 0 15 19 11 18 18 19 15 7 11 10 21 11 10 25 32 6 0 10 27 27 32 30 14 16 12 32 21 10 20 14 50 18 7 0 2 6 39 20 39 9 6 3 15 5 9 21 10 36 32 19 0 271 0 1 7 30 12 15 2 0 10 22 10 9 7 32 35 3 0 30 61 97 114 107 63 45 24 68 59 55 64 44 155 122 36 0 Total 4 86 248 340 195 1144 1 Hours of calm in this stability class: 0 Hours of missing wind measurements in this stability class: Hours of missing stability measurements in all stability classes: 3 LaSalle County Generating Station Period of Record: April -June 2007 Stability Class -Slightly Stable -375Ft-33Ft Delta-T (F)Winds Measured at 375 Feet Wind Speed (in mph)Wind Direction 1-3 4-7 8-12 13-18 19-24 > 24 Total N 1 2 6 4 0 0 13 NNE 0 1 4 23 4 1 33 NE 1 1 10 8 0 0 20 ENE 1 2 14 30 11 0 58 E 0 3 9 23 17 20 72 ESE 1 1 8 21 10 9 50 SE 1 3 9 6 4 2 25 SSE 0 2 3 5 3 4 17 S 0 0 4 3 9 18 34 SSW 0 0 5 5 12 25 47 SW 0 0 5 10 15 24 54 WSW 1 1 7 11 6 2 28 W 0 1 7 11 10 9 38 WNW 0 7 8 14 14 20 63 NW 0 3 9 10 11 1 34 NNW 0 5 9 8 3 0 25 Variable 0 0 0 0 0 0 0 Total 6 32 117 192 129 135 611 Hours of calm in this stability class: 0 Hours of missing wind measurements in this stability class: 0 Hours of missing stability measurements in all stability classes: 3 LaSalle County Generating Station Period of Record: April -June 2007 Stability Class -Moderately Stable -375Ft-33Ft Delta-T (F)Winds Measured at 375 Feet Wind Direction N NNE NE ENE E Wind Speed (in mph)1-3 4-7 8-12 13-18 19-24 > 24 Total 1 0 1 0 0 2 4 3 1 0 4 1 0 4 0 1 1 1 1 6 1 0 0 0 4 2 3 8 0 0 0 0 9 6 5 6 ESE SE SSE S SSW SW WSW W 1 4 0 10 4 13 6 23 3 17 2 10 1 2 4 0 0 0 4 4 4 0 5 4 7 4 3 3 1 6 4 0 5 17 31 4 20 35 4 5 3 1 3 3 0 5 13 4 14 2 1 8 9 NW 0 14 0 11 NNW Variable Total 0 0 0 0 0 0 6 18 31 61 46 62 224 Hours of calm in this stability class: 1 Hours of missing wind measurements in this stabi lity class: 0 tability classes: Hours of missing stability measurements in all s 3 LaSalle County Generating Station Period of Record: April -Stability Class -Extremely Stable Winds Measured at 375 June 2007-375Ft-33Ft Delta-T (F)Feet Wind Speed (in mph)Wind Direction N NNE NE ENE E ESE SE SSE 1-3 0 0 0 0 1 0 1 0 4-7 8-12 13-18 19-24 > 24 Total S 0 0 1 0 0 1 1 0 2 0 0 2 1 0 0 0 0 0 0 0 0 0 1 0 0 0 1 2 0 3 2 1 0 0 0 0 0 0 0 0 3 4 3 2 2 2 2 2 5 1 0 0 0 0 0 0 1 2 5 0 0 0 0 1 0 0 0 2 4 6 1 12 0 0 1 0 11 14 2 12 18 SSW SW WSW W WNW NW NNW Variable Total 4 3 14 4 13 21 0 0 0 0 0 0 0 0 0 0 6 4 6 1 0 9 10 26 18 41 109 Hours of calm in this stability class: 1 Hours of missing wind measurements in this stability class: 0 Hours of missing stability measurements in all stability classes: 3 LaSalle County Generating Station Period of Record: July -September 2007 Stability Class -Extremely Unstable -200Ft-33Ft Delta-T (F)Winds Measured at 33 Feet Wind Speed (in mph)Wind Direction N NNE NE ENE E ESE SE SSE S SSW SW WSW W WNW NW 1-3 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 4-7 8-12 13-18 19-24 > 24 Total 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 1 0 13 0 0 0 0 0 0 0 9 4 2 2 0 0 0 Variable Total 0 1 10 15 5 0 31 Hours of calm in this stability class: Hours of missing wind measurements in this 0 stability class: 0 Hours of missing stability measurements in all stability classes: 0 LaSalle County Generating Station Period of Record: July -September 2007 Stability Class -Moderately Unstable -200Ft-33Ft Delta-T (F)Winds Measured at 33 Feet Wind Speed (in mph)Wind Direction 1-3 4-7 8-12 13-18 19-24 > 24 Total N 0 0 1 1 0 0 2 NNE 0 0 1 0 0 0 1 NE 0 0 0 0 0 0 0 ENE 0 0 0 0 0 0 0 E 0 0 1 0 0 0 1 ESE 0 1 1 0 0 0 2 SE 0 0 0 0 0 0 0 SSE 0 0 0 0 0 0 0 S 0 0 0 2 0 0 2 SSW 0 0 10 7 0 0 17 SW 0 2 19 7 0 0 28 WSW 0 0 6 5 2 0 13 W 0 0 7 6 0 0 13 WNW 0 0 16 3 0 0 19 NW 0 0 4 2 0 0 6 NNW 0 0 0 0 0 0 0 Variable 0 0 0 0 0 0 0 Total 0 3 66 33 2 0 104 Hours of calm in this stability class: 0 Hours of missing wind measurements in this stability class: 0 Hours of missing stability measurements in all stability classes: 0 LaSalle County Generating Station Period of Record: July -Stability Class -Slightly Unstable Winds Measured at September 2007-200Ft-33Ft Delta-T (F)33 Feet Wind Speed (in mph)Wind Direction 1-3 4-7 8-12 13-18 19-24 > 24 Total N 0 3 5 NNE NE ENE E ESE SE SSE 0 10 S SSW SW WSW W WNW 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 4 0 3 1 0 1 1 0 6 7 8 1 0 1 1 4 6 1 0 0 0 0 0 1 0 4 6 6 4 4 1 3 0 0 0 0 9 0 0 0 0 0 0 0 0 2 0 0 1 0 0 0 0 3 0 0 0 0 0 0 0 16 0 11 9 17 8 10 8 4 1 2 2 9 0 14 0 32 0 22 0 17 0 22 0 10 6 6 8 13 NW NNW Variable Total 3 1 0 4 8 0 0 0 9 0 0 58 97 30 0 188 Hours of calm in this stability class: 0 Hours of missing wind measurements in this stabili ty class: 0 bility classes: Hours of missing stability measurements in all sta 0 LaSalle County Generating Station Period of Record: July -September 2007 Stability Class -Neutral -200Ft-33Ft Delta-T (F)Winds Measured at 33 Feet Wind Speed (in mph)Wind Direction 1-3 4-7 8-12 13-18 19-24 > 24 Total N 2 NNE 2 NE 1 ENE 0 E 1 ESE 0 SE 1 SSE 1 S 3 SSW 2 SW 1 WSW 0 W 0 WNW 1 NW 0 NNW 1 Variable 0 34 46 24 24 34 20 18 24 12 6 17 28 16 25 13 15 0 15 1 6 0 23 2 20 4 20 2 9 1 17 0 18 1 19 20 17 17 22 7 19 14 11 6 17 2 9 4 28 14 0 0 52 54 50 48 57 30 36 44 54 42 47 61 34 48 27 58 0 Total 16 356 270 95 5 0 742 Hours of calm in this stability class: 0 Hours of missing wind measurements in this stabili Hours of missing stability measurements in all sta ty class: 1 bility classes: 0 LaSalle County Generating Station Period of Record: July -Stability Class -Slightly Stable Winds Measured at Wind Speed Wind September 2007-200Ft-33Ft Delta-T (F)33 Feet (in mph)Direction 1-3 4-7 8-12 13-18 19-24 > 24 Total N 3 NNE 4 NE 2 ENE 3 E 0 ESE 4 SE 3 SSE 2 S 2 SSW 2 SW 0 WSW 3 W 1 WNW 3 NW 1 NNW 2 Variable 0 34 31 8 7 17 10 11 5 9 13 18 7 4 11 7 16 0 5 6 18 21 21 11 5 13 16 19 25 10 6 8 4 11 0 199 0 0 0 3 0 0 0 1 3 2 13 3 0 1 2 0 0 28 42 41 28 34 38 25 19 21 33 37 56 23 12 23 14 29 0 Total 35 208 0 475 Hours of calm in this stability class: 0 Hours of missing wind measurements in this stability class: 0 Hours of missing stability measurements in all stability classes: 0 LaSalle County Generating Station Period of Record: July -Stability Class -Moderately Stable Winds Measured at Wind Speed Wind September 2007-200Ft-33Ft Delta-T (F)33 Feet (in mph)Direction N NNE NE ENE E ESE SE SSE S SSW SW WSW W WNW NW NNW Variable 1-3 4-7 8-12 13-18 19-24 > 24 Total 19 9 1 1 34 25 18 17 15 19 17 11 15 20 11 6 0 0 0 0 0 14 3 2 11 4 8 18 1 1 4 0 2 0 68 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 21 9 2 1 49 29 21 32 19 31 36 13 17 27 12 9 0 Total 22 238 0 0 0 328 Hours of calm in this stability class: 2 Hours of missing wind measurements in this stability class: 1 Hours of missing stability measurements in all stability classes: 0 LaSalle County Generating Station Period of Record: July -September 2007 Stability Class -Extremely Stable -200Ft-33Ft Delta-T (F)Winds Measured at 33 Feet Wind Speed (in mph)Wind Direction N NNE NE ENE E ESE SE SSE S SSW SW WSW W WNW NW NNW Variable 1-3 4-7 8-12 13-18 19-24 > 24 Total 1 0 1 1 2 3 0 1 0 0 0 1 2 0 1 0 0 8 5 0 1 9 29 45 37 21 23 22 20 11 8 6 3 0 0 0 0 0 4 6 8 15 2 12 16 11 1 0 0 0 0 75 9 5 1 2 15 38 53 53 23 35 38 32 14 8 7 3 0 Total 13 248 0 0 0 336 Hours of calm in this stability class: 0 Hours of missing wind measurements in this stability class: 0 Hours of missing stability measurements in all stability classes: 0 LaSalle County Generating Station Period of Record: July -September 2007 Stability Class -Extremely Unstable -375Ft-33Ft Delta-T (F)Winds Measured at 375 Feet Wind Speed (in mph)Wind Direction N NNE NE ENE E ESE SE SSE S SSW SW WSW W WNW NW NNW Variable Total 1-3 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 4-7 8-12 13-18 19-24> 24 Total 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 Hours of calm in this stability class: 0 Hours of missing wind measurements in this stability class: 0 Hours of missing stability measurements in all stability classes: 0 LaSalle County Generating Station Period of Record: July -September 2007 Stability Class -Moderately Unstable -375Ft-33Ft Delta-T (F)Winds Measured at 375 Feet Wind Speed (in mph)Wind Direction 1-3 4-7 8-12 13-18 19-24 > 24 Total N 0 0 0 0 0 0 0 NNE 0 0 0 0 0 0 0 NE 0 0 0 0 0 0 0 ENE 0 0 0 0 0 0 0 E 0 0 0 0 0 0 0 ESE 0 0 0 0 0 0 0 SE 0 0 0 0 0 0 0 SSE 0 0 0 0 0 0 0 S 0 0 0 0 0 0 0 SSW 0 0 0 1 0 0 1 SW 0 0 0 0 0 0 0 WSW 0 0 0 0 0 1 1 W 0 0 0 0 0 0 0 WNW 0 0 0 0 0 0 0 NW 0 0 0 0 0 0 0 NNW 0 0 0 0 0 0 0 Variable 0 0 0 0 0 0 0 Total 0 0 0 1 0 1 2 Hours of calm in this stability class: 0 Hours of missing wind measurements in this stability class: 0 Hours of missing stability measurements in all stability classes: 0 LaSalle County Generating Station Period of Record: July -September 2007 Stability Class -Slightly Unstable -375Ft-33Ft Delta-T (F)Winds Measured at 375 Feet Wind Speed (in mph)Wind Direction N NNE NE ENE E ESE SE SSE S SSW 1-3 0 0 0 0 0 0 0 0 0 0 4-7 8-12 13-18 19-24 > 24 Total 0 1 0 0 0 0 0 0 0 4 4 0 0 1 0 0 0 0 0 0 0 0 0 0 0 0 6 1 0 0 3 0 0 0 0 0 0 0 0 0 0 0 0 5 5 2 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 1 0 0 0 0 0 0 0 3 18 0 10 SW WSW W 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 2 0 0 0 0 0 4 0 4 0 0 0 NNW Variable Total 0 10 10 12 5 37 Hours of, calm in this stability class: Hours of missing wind measurements in this Hours of missing stability measurements in 0 stability class: 0 all stability classes: 0 LaSalle County Generating Station Period of Record: July -September 2007 Stability Class -Neutral -375Ft-33Ft Delta-T (F)Winds Measured at 375 Feet Wind Speed (in mph)Wind Direction N NNE NE ENE E ESE SE SSE S SSW SW WSW W WNW NW NNW Variable 1-3 4-7 8-12 13-18 19-24 > 24 Total 20 20 15 11 17 10 14 16 4 1 13 6 7 14 11 9 0 24 44 24 22 26 10 11 10 8 12 29 41 21 30 23 14 0 9 10 26 26 7 9 8 7 22 36 37 10 14 30 21 17 0 2 0 4 0 1 2 3 0 17 17 16 19 5 5 11 10 0 0 0 0 0 0 0 0 0 4 15 4 4 3 3 1 0 0 55 74 71 59 52 31 36 33 55 82 102 80 50 82 68 50 0 Total 8 188 349 289 112 34 980 Hours of calm in this stability class: 0 Hours of missing wind measurements in this stability class: 1 Hours of missing stability measurements in all stability classes: 0 LaSalle County Generating Station Period of Record: July -September 2007 Stability Class -Slightly Stable -375Ft-33Ft Delta-T (F)Winds Measured at 375 Feet Wind Direction N NNE NE ENE E ESE SE SSE S SSW SW WSW W WNW NW NNW Variable Wind Speed (in mph)1-3 4-7 8-12 13-18 19-24 > 24 Total 15 15 5 15 10 6 11 5 6 3 8 3 6 4 8 4 0 16 24 29 42* 17 5 5 7 8 9 10 12 11 11 11 6 0 223 17 2 5 8 7 6 6 6 11 12 22 10 5 5 11 7 0 0 0 0 0 0 3 1 2 9 17 18 5 1 2 3 1 0 52 46 43 69 45 28 28 25 40 42 65 38 25 30 35 25 0 Total 11 76 124 140 62 636 Hours of calm in this stability class: 0 Hours of missing wind measurements in this stability class: 0 Hours of missing stability measurements in all stability classes: 0 LaSalle County Generating Station Period of Record: July -September 2007 Stability Class -Moderately Stable -375Ft-33Ft Delta-T (F)Winds Measured at 375 Feet Wind Speed (in mph)Wind Direction 1-3 4-7 8-12 13-18 19-24 > 24 Total N 1 3 2 3 1 0 10 NNE 0 6 6 3 3 0 18 NE 0 3 4 8 0 0 15 ENE 1 2 3 0 1 0 7 E 0 2 4 11 8 0 25 ESE 1 9 13 8 10 2 43 SE 0 2 5 9 5 5 26 SSE 0 5 4 4 9 6 28 S 0 6 3 4 11 8 32 SSW 0 4 4 4 13 7 32 SW 0 3 8 12 12 15 50 WSW 0 0 5 5 3 2 15 W 0 1 9 5 5 0 20 WNW 0 0 4 3 6 0 13 NW 0 0 2 7 4 1 14 NNW 0 1 3 7 1 0 12 Variable 0 0 0 0 0 0 0 Total 3 47 79 93 92 46 360 Hours of calm in this stability class: 1 Hours of missing wind measurements in this stability class: 0 Hours of missing stability measurements in all stability classes: 0 LaSalle County Generating Station Period of Record: July -September 2007 Stability Class -Extremely Stable-375Ft-33Ft Delta-T (F)Winds Measured at 375 Feet Wind Speed (in mph)Wind Direction N NNE NE ENE E ESE SE SSE S SSW SW WSW W WNW NW NNW Variable 1-3 4-7 8-12 13-18 19-24 > 24 Total 0 0 0 0 0 0 0 0 0 0 0 1 0 0 0 0 0 0 0 0 0 0 2 15 22 16 9 12 5 0 0 0 0 0 0 1 1 0 2 10 28 35 27 28 30 14 12 3 0 0 0 Total 1 11 Hours of calm in this stability class Hours of missing wind measurements in Hours of missing stability measuremen 18 36 44 81 191 0* this stability class: 0.ts in all stability classes: 0 LaSalle County Generating Station Period of Record: October -December 2007 Stability Class -Extremely Unstable -200Ft-33Ft Delta-T (F)Winds Measured at 33 Feet Wind Speed (in mph)Wind Direction N NNE NE ENE E ESE SE SSE S SSW SW WSW W WNW NW NNW Variable Total 1-3 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 4-7 8-12 13-18 19-24 > 24 Total 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 1 0 0 0 0 0 0 1 Hours of calm in Hours of missing Hours of missing this stability class: wind measurements in this stability measurements in 0 stability class: 0 all stability classes: 3 LaSalle County Generating Station Period of Record: October -December 2007 Stability Class -Moderately Unstable -200Ft-33Ft Delta-T (F)Winds Measured at 33 Feet Wind Speed (in mph)Wind Direction N NNE NE ENE E ESE SE SSE S SSW SW WSW W WNW NW NNW Variable Total 1-3 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 4-7 8-12 13-18 19-24 > 24 Total 0 0 0 0 0 0 0 0 0 1 2 0 0 0 0 0 0 0 0 5 0 3 0 0 0 0 0 1 1 0 0 0 0 0 1 12 Hours of calm in this stability class: 0 Hours of missing wind measurements in this stability class: 0 Hours of missing stability measurements in all stability classes: 3 LaSalle County Generating Station Period of Record: October -December 2007 Stability Class -Slightly Unstable -200Ft-33Ft Delta-T (F)Winds Measured at 33 Feet Wind Speed (in mph)Wind Direction N NNE NE ENE E ESE SE SSE S SSW SW WSW W WNW NW NNW variable 1-3 4-7 8-12 13-18 19-24 > 24 Total 2 4 1 1 0 0 0 1 1 12 6 3 3 0 1 0 0 Total 0 0 11 19 1 4 35 Hours of calm in this stability class: Hours of missing wind measurements in this Hours of missing stability measurements in 0 stability class: 0 all stability classes: 3 LaSalle County Generating Station Period of Record: October-December 2007 Stability Class -Neutral -200Ft-33Ft Delta-T (F)Winds Measured at 33 Feet Wind Speed (in mph)Wind Direction 1-3 4-7 8-12 13-18 19-24 > 24 Total N 2 NNE 1 NE 0 ENE 0 E 0 ESE 1 SE 0 SSE 0 S 1 SSW 0 SW 0 WSW 1 W 2 WNW 0 NW 1 NNW 0 Variable 0 27 27 23 33 6 9 6 5 8 8 3 15 6 13 4 22 4 31 4 30 2 37 4 14 11 35 14 24 11 22 3 42 0 0 23 5 10 0 8 1 9 2 12 0 10 1 5 1 11 6 13 0 6 6 21 2 5 10 29 22 37 12 40 26 37 11 0 0 0 0 0 0 0 0 0 1 3 3 2 16 0 4 1 0 84 67 24 22 28 30 25 44 50 49 65 36 115 87 104 94 0 Total 9 136 367 276 105 31 924 Hours of calm in this stability class: Hours of missing wind measurements in this Hours of missing stability measurements in 0 stability class: 0 all stability classes: 3 LaSalle County Generating Station Period of Record: October-December 2007 Stability Class -Slightly Stable -200Ft-33Ft Delta-T (F)Winds Measured at 33 Feet Wind Speed (in mph)Wind Direction 1-3 4-7 8-12 13-18 19-24 > 24 Total N 2 NNE 2 NE 0 ENE 2 E 0 ESE 0 SE 1 SSE 0 S 0 SSW 1 SW 0 WSW 1 W 0 WNW 5 NW 2 NNW 0 Variable 0 23 16 3 2 11 17 10 9 10 12 15 13 13 19 16 15 0 7 14 12 4 13 27 10 17 21 17 20 11 15 16 26 24 0 2 0 3 2 2 5 18 16 21 27 24 19 12 7 12 1 0 0 0 0 0 0 0 1 4 6 5 3 1 5 27 6 0 0 0 0 0 0 0 0 0 0 0 0 1 0 0 12 0 0 0 34 32 18 10 26 49 40 46 58 62 63 45 45 86 62 40 0 Total 16 204 254 171 58 13 716 Hours of calm in this stability class: Hours of missing wind measurements in this Hours of missing stability measurements in 0 stability class: 0 all stability classes: 3 LaSalle County Generating Station Period of Record: October -December 2007 Stability Class -Moderately Stable Winds Measured at Wind Speed-200Ft-33Ft Delta-T (F)33 Feet (in mph)13-18 19-24 > 24 Total Wind Direction N NNE NE ENE E ESE SE SSE S SSW SW WSW W WNW NW NNW Variable 1-3 4-7 8-12 5 2 0 1 1 5 3 5 14 14 6 0 10 13 12 0 0 2 0 0 1 5 5 9 9 19 14 24 13 8 6 14 1 0 0 0 0 0 0 0 0 0 7 14 11 1 1 0 0 0 0 34 8 3 0 2 6 12 12 15 40 42 41 15 20 19 26 2 0 Total 8 91 130 0 0 263 Hours of calm in this stability class: 0 Hours of missing wind measurements in this stability class: 0 Hours of missing stability measurements in all stability classes: 3 LaSalle County Generating Station Period of Record: October -December 2007 Stability Class -Extremely Stable -200Ft-33Ft Delta-T (F)Winds Measured at 33 Feet Wind Speed (in mph)Wind Direction 1-3 4-7 8-12 13-18 19-24 > 24 Total N 0 0 0 0 0 0 0 NNE 0 0 0 0 0 0 0 NE 0 0 0 0 0 0 0 ENE 0 0 0 0 0 0 0 E 0 0 1 0 0 0 1 ESE 0 5 2 0 0 0 7 SE 0 17 3 0 0 0 20 SSE 2 34 9 0 0 0 45 S 0 30 22 1 0 0 53 SSW 0 15 16 0 0 0 31 SW 0 8 25 0 0 0 33 WSW 0 9 12 0 0 0 21 W 0 13 5 0 0 0 18 WNW 0 10 3 0 0 0 13 NW 0 5 6 0 0 0 11 NNW 1 0 0 0 0 0 1 Variable 0 0 0 0 0 0 0 Total 3 146 104 1 0 0 254 Hours of calm in this stability class: 0 Hours of missing wind measurements in this stability class: 0 Hours of missing stability measurements in all stability classes: 3 LaSalle County Generating Station Period of Record: October -December 2007 Stability Class -Extremely Unstable -375Ft-33Ft Delta-T (F)Winds Measured at 375 Feet Wind Speed (in mph)Wind Direction 1-3 4-7 8-12 13-18 19-24 > 24 Total N 0 0 0 0 0 0 0 NNE 0 0 0 0 0 0 0 NE 0 0 0 0 0 0 0 ENE 0 0 0 0 0 0 0 E 0 0 0 0 0 0 0 ESE 0 0 0 0 0 0 0 SE 0 0 0 0 0 0 0 SSE 0 0 0 0 0 0 0 S 0 0 0 0 0 0 0 SSW 0 0 0 0 0 0 0 SW 0 0 0 0 0 0 0 WSW 0 0 0 0 0 0 0 W 0 0 0 0 0 0 0 WNW 0 0 0 0 0 0 0 NW 0 0 0 0 0 0 0 NNW 0 0 0 0 0 0 0 Variable 0 0 0 0 0 0 0 Total 0 0 0 0 0 0 0 Hours of calm in this stability class: 0 Hours of missing wind measurements in this stability class: 0 Hours of missing stability measurements in all stability classes: 3 LaSalle County Generating Station Period of Record: October -December 2007 Stability Class -Moderately Unstable -375Ft-33Ft Delta-T (F)Winds Measured at 375 Feet Wind Direction Wind Speed (in mph)8-12 13-18 19-24 1-3 4-7> 24 Total N NNE NE ENE E ESE SE SSE S SSW SW WSW W WNW NW 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 Variable Total Hours of calm in this stability class: Hours of missing wind measurements in this Hours of missing stability measurements in 0 stability class: all stability cl 0 asses: 3 LaSalle County Generating Station Period of Record: October -December 2007 Stability Class -Slightly Unstable -375Ft-33Ft Delta-T (F)Winds Measured at 375 Feet Wind Speed (in mph)Wind Direction 1-3 4-7 N 0 NNE 0 NE 0 ENE 0 E 0 ESE 0 SE 0 SSE 0 S 0 SSW 0 SW 0 WSW 0 W 0 WNW 0 NW 0 NNW 0 Variable 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 8-12 13-18 19-24 > 24 0 1 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 2 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 Total 1 0 0 0 0 0 0 0 0 0 2 0 0 0 0 0 0 Total 0 0 1 2 0 3 Hours of calm in this stability class: 0 Hours of missing wind measurements in this stability class: 0 Hours of missing stability measurements in all stability classes: 3 LaSalle County Generating Station Period of Record: October -December 2007 Stability Class -Neutral -375Ft-33Ft Delta-T (F)Winds Measured at 375 Feet Wind Speed (in mph)Wind Direction N NNE NE ENE E ESE SE SSE S SSW SW WSW W WNW NW NNW Variable 1-3 4-7 8-12 13-18 19-24 > 24 Total 10 6 4 5 1 4 0 0 1 2 6 2 2 6 7 4 0 12 16 3 7 7 3 7 8 15 14 15 14 22 11 27 11 0 12 20 13 12 8 12 9 10 26 32 32 7 23 18 18 23 0 25 23 10 6 7 6 7 6 8 13 15 6 23 23 39 20 0 237 10 4 5 1 1 4 1 11 5 15 7 38 22 31 35 12 0 202 69 69 35 31 24 29 24 35 55 76 76 67 92 89 126 72 0 969 Total 3 60 192 275 Hours of calm in this stability class: 0 Hours of missing wind measurements in this stabili ty class: 5 bility classes: Hours of missing stability measurements in all sta 3 LaSalle County Generating Station Period of Record: October -December 2007 Stability Class -Slightly Stable Winds Measured at-375Ft-33Ft Delta-T (F)375 Feet Wind Speed (in mph)Wind Direction N NNE NE ENE E ESE SE SSE S SSW SW WSW W WNW NW NNW Variable 1-3 4-7 8-12 13-18 19-24 > 24 Total 5 14 7 8 2 1 2 6 6 3 6 9 9 5 4 4 0 6 14 9 3 5 1 15 21 23 21 14 11 12 9 32 10 0 10 2 3 1 3 9 13 15 20 17 25 5 7 25 8 13 0 3 0 1 0 2 3 15 9 25 57 31 16 18 58 5 2 0 27 34 23 16 15 15 46 53 76 100 78 43 46 100 58 33 0 763 Total 7 38 91 206 176 245 Hours of calm in this stability class: 0 Hours of missing wind measurements in this stability class: 27 Hours of missing stability measurements in all stability classes: 3 LaSalle County Generating Station Period of Record: October -December 2007 Stability Class -Moderately Stable -375Ft-33Ft Delta-T (F)Winds Measured at 375 Feet Wind Speed (in mph)Wind Direction N NNE NE ENE E ESE SE SSE S SSW SW WSW W WNW NW NNW Variable 1-3 4-7 8-12 13-18 19-24 > 24 Total 2 0 0 0 1 1 0 1 0 0 4 2 2 2 3 0 0 1 3 2 3 0 0 4 2 7 11 5 4 1 4 1 2 0 2 0 0 0 0 1 1 4 7 15 6 9 7 8 5 5 0 5 0 0 0 0 2 2 2 7 16 11 12 5 5 4 5 0 2 0 0 0 0 4 4 8 16 35 6 8 4 2 4 1 0 12 3 2 3 i 8 11 17 38 77 32 36 19 22 17 13 0 Total 3 18 50 70 76 94 311 Hours of calm in this stability class: 0 Hours of missing wind measurements in this stability class: 0 Hours of missing stability measurements in all stability classes: 3 LaSalle County Generating Station Period of Record: October -December 2007 Stability Class -Extremely Stable -375Ft-33Ft Delta-T (F)Winds Measured at 375 Feet Wind Speed (in mph)Wind Direction N NNE NE ENE E ESE SE 1-3 0 0 0 0 0 0 0 4-7 8-12 13-18 19-24 > 24 Total 1 0 0 0 0 0 0 1 1 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 2 2 5 0 0 0 0 0 0 3 2 1 0 0 0 0 5 SSE 0 0 1 12 4 19 5 20 S SSW SW WSW W WNW NW NNW Variable Total 1 1 2 0 0 0 0 0 0 9 3 12 13 29 2 19 21 44 0 0 0 0 1 0 0 1 0 0 3 0 1 1 0 0 0 0 1 2 0 0 4 0 7 27 44 48 127 Hours of calm in this stability class: 0 Hours of missing wind measurements in this stability class: 0 Hours of missing stability measurements in all stability classes: 3

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