RA10-040, Notice of NPDES Permit Modification for Exelon Generation Company, LLC, LaSalle County Station NPDES Permit No. 1L0048151

Notice of NPDES Permit Modification for Exelon Generation Company, LLC, LaSalle County Station NPDES Permit No. 1L0048151

ML101410154
Person / Time
Site:	LaSalle
Issue date:	05/21/2010
From:	Rhoades D Exelon Generation Co, Exelon Nuclear
To:	Document Control Desk, Office of Nuclear Reactor Regulation
References
1L0048151, RA10-040
Download: ML101410154 (15)

Text

ISM Exelon Generation Company, LLC www.exeloncorp.com LaSalle County Station Nuclear 2601 North 21" Road Marseilles, IL 61341-9757 RA10-040 10 CFR 50.4 May 21, 2010 U.S. Nuclear Regulatory Commission ATTN: Document Control Desk Washington, D.C. 20555 LaSalle County Station, Units 1 and 2 Facility Operating License Nos. NPF-11 and NPF-18 NRC Docket Nos. 50-373 and 50-374

Subject:

Notice of NPDES Permit Modification for Exelon Generation Company, LLC, LaSalle County Station NPDES Permit No. 1 L0048151

Reference:

Letter from Alan Keller, PE., Division of Water Pollution Control, Illinois Environmental Protection Agency, dated April 26, 2010 In accordance with the 30-day notification requirements of Appendix B to Facility Operating Licenses NPF-1 1 and NPF-1 8, "Environmental Protection Plan," Section 3.2, "Reporting Related to the NPDES Permits and State Certification," notification is being provided of a modification to the final NPDES Permit for Exelon Generation Company, LLC, (EGC), LaSalle County Station (LSCS). The modified permit issued was based on an NPDES Permit Modification Request submitted to the Illinois Environmental Protection Agency (IEPA) on November 24, 2008.

The newly issued permit includes the following changes:

Increase Outfall B01 (Sewage Plant Effluent) Design Maximum Flow from 0.037 MGD to 0.100 MGD.

Increase Outfall B01 (Sewage Plant Effluent) Total Suspended Solids Load Limits from 9.25 lbs (30 day Average) / 18.5 lbs (Daily Maximum) to 25 lbs (30 day Average) / 50 lbs (Daily Maximum)

Increase Outfall B01 (Sewage Plant Effluent) CBOD5 Load Limits from 7.71 lbs (30 day Average) / 15.43 lbs (Daily Maximum) to 21 lbs (30 day Average) / 42 lbs (Daily Maximum).

The modified permit enclosed is effective April 26, 2010, and has an expiration date of June 30, 2012.

Should you have any questions concerning this letter, please contact Mr. Terrence W. Simpkin, Regulatory Assurance Manager, at (815) 415-2800.

Respectfully, David P. Rhoades Plant Manager LaSalle County Station Attachment cc: Regional Administrator - NRC Region III NRC Senior Resident Inspector- LaSalle County Station

1LuN,4olS EwP O NME NTAL P ROTECTION AGENCY 1021 NORTH GRAND AVENUE EAST, P.O. Box 19276, SPRINGFIELD, ILLINOIS 62794-9276 - ( 217) 782-2829 JAMES R THOMPSON CENTER, 100 WEsi RANDOLPH, SUITE 11-300, CHICAGO, 160601 - (312) 8146026 ROD R. B AGOJ EVICH, GOVE RNOR DOUGLAS P. ScoTC, DIRECTOR 217/782-0610 April 26, 2010 Exelon Generation Company, LLC Generation Support 4300 Winfield Road Warrenville, Illinois 60555 Re: Exelon Generation Company, LLC LaSalle County Station NPDES Permit No. IL0048151 Modification of NPDES Permit (After Public Notice)

Gentlemen:

The Illinois Environmental Protection Agency has reviewed the request for modification of the above-referenced NPDES Permit and issued a public notice based on that request. The final decision of the Agency is to modify the Permit as follows:

The modification was a change in the design maximum flow and load limits for internal outfall, BO1-Sewage Treatment Plant Effluent.

Enclosed is a copy of the modified Permit. You have the right to appeal this modification to the Illinois Pollution Control Board within a 35 day period following the modification date shown on the first page of the permit.

Should you have any question or comments regarding the above, please contact Leslie Lowry of my staff.

Sincerely, Alan Keller, P.E.

Manager, Permit Section Division of Water Pollution Control SAK:DEL:LRL:06060701.dlk

Attachment:

Final Permit cc: Records Compliance Assurance Section Rockford Region USEPA Billing

NPDES Permit No. IL0048151 Illinois Environmental Protection Agency Division of Water Pollution Control 1021 North Grand Avenue East Springfield, Illinois 62794-9276 NATIONAL POLLUTANT DISCHARGE ELIMINATION SYSTEM Modified (NPDES) Permit Expiration Date: June 30, 2012 Issue Date: March 28, 2007 Effective Date: July 1, 2007 Modification Date: April 26, 2010 Name and Address of Permittee: Facility Name and Address:

Exelon Generation Company, LLC Exelon Generation Company, LLC Generation Support LaSalle County Station 4300 Winfield Road 2601 N. 21st Street Warrenville, Illinois 60555 Marseilles, Illinois 61341 (LaSalle County)

Discharge Number and Name: Receiving Waters:

001 Cooling Pond Blowdown Illinois River A01 Demineralizer Regenerant Wastes B01 Sewage Treatment Plant Effluent C01 Wastewater Treatment System Effluent D01 Cooling Water Intake Screen Backwash (Cooling Pond)

E01 Unit 1 and 2 Radwaste Treatment System Effluent F01 Auxiliary Reactor Equipment Cooling and Flushing Water G01 North Site Stormwater Runoff H01 South Site Stormwater Runoff 101 Reverse Osmosis System Reject Water

& Greensand Filter Backwash 002 Illinois River Make-Up Water Intake Illinois River In compliance with the provisions of the Illinois Environmental Protection Act, Title 35 of 111. Adm. Code, Subtitle C and/or Subtitle D, Chapter 1, and the Clean Water Act (CWA), the above-named permittee is hereby authorized to discharge at the above location to the above-named receiving stream in accordance with the standard conditions and attachments herein.

Permittee Is not authorized to discharge after the above expiration date. In order to receive authorization to discharge beyond the expiration date, the permittee shall submit the proper application as required by the Illinois Environmental Protection Agency (IEPA) not later than 180 days prior to the expiration date.

Alan Keller, P.E.

Manager, Permit Section Division of Water Pollution Control SAK DEL:LRL:06060701.dlk

Page 2 Modification Date: April 26, 2010 NPDES Permit No. IL0048151 Effluent Limitations and Monitoring

1. From the modification date of this permit until the expiration date, the effluent of the following discharge(s) shall be monitored and limited at all times as follows:

LOAD LIMITS lbs/day CONCENTRATION DAF (DMF) LIMITS mg/I 30 DAY DAILY 30 DAY DAILY SAMPLE SAMPLE PARAMETER AVERAGE MAXIMUM AVERAGE MAXIMUM FREQUENCY TYPE Outfall 001 - Cooling Pond Blowdown*

(DMF = 67.7 MGD)

This discharge consists of Main Condenser Cooling Water Clean Condensate System Flushing and Maintenance (Alternate Route)

Demineralizer Regenerant Wastes Wastewater Treatment System Effluent House Service Water Cooling Pond Intake Screen Backwash Sewage Treatment Plant Effluent Reverse Osmosis System Reject Water Radwaste Treatment System Effluent Auxiliary Reactor Equipment Cooling Water Water Softener Regenerant Waste North Site Uncontaminated Stormwater Runoff' South Site Uncontaminated Stormwater Runoff-North Inlet Canal Stormwater Runoff"**

South Inlet Canal Stormwater Runoff***

IDNR Fish Hatchery Effluents Flow (MGD) See Special Condition 1. Daily Continuous pH See Special Condition 2. 2/Month Grab Total Residual Chlorine" 0.2 2/Month Grab Total Residual Oxidant" 0.05 2/Month Grab Temperature See Special Condition 3. Daily Continuous Zinc (Total) Monitor Only 1/Quarter Grab

• See Special Conditions 4.

• See Special Condition 13.

• • • - See Special Condition 8.

Page 3 Modification Date: April 26, 2010 NPDES Permit No. IL0048151 Effluent Limitations and Monitoring

1. From the modification date of this permit until the expiration date, the effluent of the following discharge(s) shall be monitored and limited at all times as follows:

LOAD LIMITS lbs/day CONCENTRATION DAF (DMF) LIMITS moil 30 DAY DAILY 30 DAY DAILY SAMPLE SAMPLE PARAMETER AVERAGE MAXIMUM AVERAGE MAXIMUM FREQUENCY TYPE Outfall A01 - Demineralizer Regenerant Wastes*

(DMF = 0.17 MGD)

This discharge consists of Makeup Demineralizer Regenerant Wastes Off-Specification Demineralized Water Makeup Demineralizer Maintenance Wastewater Unit Waterbox Vacuum Pump Condensate (Lake Water)

Radwaste Treatment Acid/Caustic System Drains Flow (MGD) See Special Condition 1. 1/Week 24 Hour Total Total Suspended Solids 15 30 1/Week Grab

• - Discharge to the Wastewater Treatment System (C01) is an alternate route.

Outfall B01 - Sewage Treatment Plant Effluent (DMF = 0.1 MGD)

This discharge consists of Sanitary Wastewater Eyewash Station Wastewater Flow (MGD) See Special Condition 1. Daily Continuous pH See Special Condition 2. 2/Month Grab CBOD5 21 42 25 50 2/Month 24 Hour Composite Total Suspended Solids 25 50 30 60 2/Month 24 Hour Composite

Page 4 Modification Date: April 26, 2010 NPDES Permit No. IL0048151 Effluent Limitations and Monitoring

1. From the modification date of this permit until the expiration date, the effluent of the following discharge(s) shall be monitored and limited at all times as follows:

LOAD LIMITS lbs/day CONCENTRATION DAF (DMF) LIMITS mull 30 DAY DAILY 30 DAY DAILY SAMPLE SAMPLE PARAMETER AVERAGE MAXIMUM AVERAGE MAXIMUM FREQUENCY TYPE Outfall C01 - Wastewater Treatment System Effluent (DMF = 0.082 MGD)

This discharge consists of Turbine Building Fire and Miscellaneous Nonradioactive Wastewater Sump Greensand Filter Backwash (Alternative Route)

Diesel Fuel Storage and Service Water Building Sump Auxiliary Boiler Blowdown Water Softener Regenerant Waste Demineralizer Regenerant Wastes (Alternate Route)

Heat Bay Building Roof Area Fire Protection System Flushing and Maintenance*

Service Water System Flushing and Maintenance*

Domestic Water System Flushing and Maintenance*

Clean Condensate System Flushing and Maintenance

Laboratory Liquid Wastes Station Heat System Condensate Diesel Generator Cooling Water Flow (MGD) See Special Condition 1. Daily Continuous pH See Special Condition 2. 1/Week Grab Total Suspended Solids 15 30 1/Month 24 Hour Composite Oil & Grease 15 20 1/Month Grab

• - Discharge to the North Site Stormwater Runoff (G01) and/or South Site Stormwater Runoff (H01) are alternate routes.

- Discharge to the Cooling Pond (001) via the service water system and resulting Main Condenser Cooling Water is an alternate route.

Outfall D01 - Cooling Water Intake Screen Backwash (Cooling Pond)*

(Intermittent Discharge)

• - This discharge is limited to cooling water intake screen backwash free from other wastewater discharges. Adequate maintenance of the trash basket is required to prevent the discharge of floating debris collected on intake screens back to the cooling pond.

Page 5 Modification Date: April 26, 2010 NPDES Permit No. IL0048151 Effluent Limitations and Monitoring

1. From the modification date of this permit until the expiration date, the effluent of the following discharge(s) shall be monitored and limited at all times as follows:

LOAD LIMITS lbslday CONCENTRATION DAF (DMF) LIMITS mall 30 DAY DAILY 30 DAY DAILY SAMPLE SAMPLE PARAMETER AVERAGE MAXIMUM AVERAGE MAXIMUM FREQUENCY TYPE Outfall E01 - Radwaste Treatment System Effluent (DAF = 0.011 MGD)

This discharge consists of:

Equipment Drains in the Turbine Building, Auxiliary Building, and Reactor Building Floor Drains in the Turbine Building, Auxiliary Building, and Reactor Building Condensate Polisher Waste from the Turbine Building Decontamination and Laundry Waste Flow (MGD) See Special Condition 1. 1/Week Estimate Total Suspended Solids 15 30 1NVeek Grab Oil & Grease 15 20 1NVeek Grab Outfall F01 - Auxiliary Reactor Equipment Cooling and Flushing Water*

(Intermittent Discharge)

• - This discharge is limited to auxiliary reactor equipment cooling and flushing water free from other wastewater discharges.

Outfall G01 - North Site Stormwater Runoff*

(Intermittent Discharge)

This discharge consists of:

Fire Protection System Flushing and Maintenance (Alternate Route)

Service Water System Flushing and Maintenance (Alternate Route)

Domestic Water System Flushing and Maintenance (Alternate Route)

Clean Condensate System Flushing and Maintenance (Alternate Route)

North Site Uncontaminated Stormwater Runoff

• - See Special Condition 8.

Page 6 Modification Date: April 26, 2010 NPDES Permit No. IL0048151 Effluent Limitations and Monitoring

1. From the modification date of this permit until the expiration date, the effluent of the following discharge(s) shall be monitored and limited at all times as follows:

LOAD LIMITS lbs/day CONCENTRATION DAF (DMF) LIMITS mall 30 DAY DAILY 30 DAY DAILY SAMPLE SAMPLE PARAMETER AVERAGE MAXIMUM AVERAGE MAXIMUM FREQUENCY TYPE Outfall H01 - South Site Stormwater Runoff*

(Intermittent Discharge)

This discharge consists of:

Fire Protection System Flushing and Maintenance (Alternate Route)

Service Water System Flushing and Maintenance (Alternate Route)

Domestic Water System Flushing and Maintenance (Alternate Route)

Clean Condensate System Flushing and Maintenance (Alternate Route)

South Site Uncontaminated Stormwater Runoff

• - See Special Condition 8.

Outfall 101 - Reverse Osmosis System Reject Water & Greensand Filter Backwash (DAF = 0.003 MGD)

Flow (MGD) See Special Condition 1. 1NVeek 24 Hour Total Total Suspended Solids 15 30 1lMonth Grab Outfall 002 - Illinois River Makeup Water Intake*

(Intermittent Discharge)

This discharge consists of:

River Intake Screen Backwash Trench Wash Water Process Sampling Discharge Lake Make-Up Pump Gland Leakoff, Coolers, Reliefs, and Min Flow Lake Make-Up Pump Strainer Backwash Air Compressor Receiver and Prefilter Drainage Dewatering Pump Discharge Fire Protection Water River Screen House Switchyard Stormwater Runoff" River Screen House Floor Drains and Roof Drains

• - Adequate maintenance of the intake screen system is required to prevent the discharge of floating debris collected on intake screens back to the Illinois River.

• • - See Special Condition 8.

Page 7 Modification Date: April 26, 2010 NPDES Permit No. IL0048151 Special Conditions SPECIAL CONDITION 1. Flow shall be measured in units of Million Gallons per Day (MGD) and reported as a monthly average and a daily maximum on the monthly Discharge Monitoring Report.

SPECIAL CONDITION 2. The pH shall be In the range 6.0 to 9.0. The monthly minimum and monthly maximum values shall be reported on the DMR form.

SPECIAL CONDITION 3. Discharge of wastewater from this facility must not alone or in combination with other sources cause the receiving stream to violate the following thermal limitations at the edge of the mixing zone which is defined by Section 302.211, Illinois Administration Code, Title 35, Chapter 1, Subtitle C, as amended:

A. Maximum temperature rise above natural temperature must not exceed 5 deg. F (2.8 deg. C).

B. Water temperature at representative locations in the main river shall not exceed the maximum limits in the following table during more than one (1) percent of the hours in the 12-month period ending with any month. Moreover, at no time shall the water temperature at such locations exceed the maximum limits in the following table by more than 3 deg. F (1.7 deg. C). (Main river temperatures are temperatures of those portions of the river essentially similar to and following the same thermal regime as the temperatures of the main flow of the river.)

Jan. Feb Mar AAr May June M ull Aug_ Seot Oct. Nov. Dec.

F° 60 60 60 90 90 90 90 90 90 90 90 60 C° 16 16 16 32 32 32 32 32 32 32 32 16 C. Compliance with the thermal effluent monitoring requirements shall be determined by reporting daily maximum water temperatures of the cooling pond blowdown discharge with monthly DMR's.

SPECIAL CONDITION 4. There shall be no discharge of polychlorinated biphenyl compounds (PCBs).

SPECIAL CONDITION 5. There shall be no discharge of complexed metal bearing wastestreams and associated rinses from chemical metal cleaning unless this permit has been modified to include the new discharge.

SPECIAL CONDITION 6. The pemhittee shall record monitoring results on Discharge Monitoring Report Forms using one such form for each outfall each month.

In the event that an outfall does not discharge during a monthly reporting period, the DMR Form shall be submitted with no discharge indicated.

The Permittee may choose to submit electronic DMRs (eDMRs) instead of mailing paper DMRs to the IEPA. More information, including registration information for the eDMR program, can be obtained on the IEPA website, http://www.epa.state.i l.us/water/edmrfii ndex.html.

The completed Discharge Monitoring Report forms shall be submitted to IEPA no later than the 15th day of the following month, unless otherwise specified by the permitting authority.

Permittees not using eDMRs shall mail Discharge Monitoring Reports with an original signature to the )EPA at the following address:

Illinois Environmental Protection Agency Bureau of Water Compliance Assurance Section 1021 North Grand Avenue East P.O. Box 19276 Springfield, Illinois 62794-9276 SPECIAL CONDITION 7. The upset defense provisions as defined in 40 CFR 122.41(n) are hereby incorporated by reference.

Page 8 Modification Date: April 26, 2010 NPDES Permit No. IL0048151 Soecial Conditions SPECIAL CONDITION B.

STORM WATER POLLUTION PREVENTION PLAN (SWPPP)

A. A storm water pollution prevention plan shall be maintained by the permittee for the storm water associated with industrial activity at this facility. The plan shall identify potential sources of pollution which may be expected to affect the quality of storm water discharges associated with the industrial activity at the facility. In addition, the plan shall describe and ensure the implementation of practices which are to be used to reduce the pollutants in storm water discharges associated with industrial activity at the facility and to assure compliance with the terms and conditions of this permit.

B. The owner or operator of the facility shall make a copy of the plan available to the Agency at any reasonable time upon request.

C. The permittee may be notified by the Agency at any time that the plan does not meet the requirements of this condition. After such notification, the permittee shall make changes to the plan and shall submit a written certification that the requested changes have been made. Unless otherwise provided, the permittee shall have 30 days after such notification to make the changes.

D. The discharger shall amend the plan whenever there is a change in construction, operation, or maintenance which may affect the discharge of significant quantities of pollutants to the waters of the State or if a facility inspection required by paragraph G of this condition indicates that an amendment is needed. The plan should also be amended if the discharger is in violation of any conditions of this permit, or has not achieved the general objective of controlling pollutants in storm water discharges.

Amendments to the plan shall be made within the shortest reasonable period of time, and shall be provided to the Agency for review upon request.

E. The plan shall provide a description of potential sources which may be expected to add significant quantities of pollutants to storm water discharges, or which may result in non-storm water discharges from storm water outfalls at the facility. The plan shall include, at a minimum, the following items:

1. A topographic map extending one-quarter mile beyond the property boundaries of the facility, showing: the facility, surface water bodies, wells (including injection wells), seepage pits, infiltration ponds, and the discharge points where the facility's storm water discharges to a municipal storm drain system or other water body. The requirements of this paragraph may be included on the site map if appropriate.

2. A site map showing:

1. The storm water conveyance and discharge structures; li. An outline of the storm water drainage areas for each storm water discharge point; iii. Paved areas and buildings; iv. Areas used for outdoor manufacturing, storage, or disposal of significant materials, including activities that generate significant quantities of dust or particulates.

V. Location of existing storm water structural control measures (dikes, coverings, detention facilities, etc.);

Vi. Surface water locations and/or municipal storm drain locations VII. Areas of existing and potential soil erosion; viii. Vehicle service areas; ix. Material loading, unloading, and access areas.

3. A narrative description of the following:

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Page 9 Modification Date: April 26, 2010 NPDES Permit No. IL0048151 Special Conditions iii. Existing structural and non-structural control measures to reduce pollutants in storm water discharges; iv. Industrial storm water discharge treatment facilities; V. Methods of onsite storage and disposal of significant materials;

4. A list of the types of pollutants that have a reasonable potential to be present in storm water discharges in significant quantities.

5. An estimate of the size of the facility in acres or square feet, and the percent of the facility that has impervious areas such as pavement or buildings.

6. A summary of existing sampling data describing pollutants in storm water discharges.

F. The plan shall describe the storm water management controls which will be implemented by the facility. The appropriate controls shall reflect identified existing and potential sources of pollutants at the facility. The description of the storm water management controls shall include:

1. Storm Water Pollution Prevention Personnel - Identification by job titles of the individuals who are responsible for developing, implementing, and revising the plan.

2. Preventive Maintenance - Procedures for inspection and maintenance of storm water conveyance system devices such as oilfwater separators, catch basins, etc., and inspection and testing of plant equipment and systems that could fail and result in discharges of pollutants to storm water.

3. Good Housekeeping - Good housekeeping requires the maintenance of clean, orderly facility areas that discharge storm water. Material handling areas shall be inspected and cleaned to reduce the potential for pollutants to enter the storm water conveyance system.

4. Spill Prevention and Response - Identification of areas where significant materials can spill into or otherwise enter the storm water conveyance systems and their accompanying drainage points. Specific material handling procedures, storage requirements, spill dean up equipment and procedures should be identified, as appropriate. Internal notification procedures for spills of significant materials should be established.

5. Storm Water Management Practices - Storm water management practices are practices other than those which control the source of pollutants. They include measures such as installing oil and grit separators, diverting storm water into retention basins, etc. Based on assessment of the potential of various sources to contribute pollutants, measures to remove pollutants from storm water discharge shall be implemented. In developing the plan, the following management practices shall be considered:

1. Containment - Storage within berms or other secondary containment devices to prevent leaks and spills from entering storm water runoff; ii. Oil & Grease Separation - Oil/water separators, booms, skimmers or other methods to minimize oil contaminated storm water discharges; iii. Debris & Sediment Control - Screens, booms, sediment ponds or other methods to reduce debris and sediment in storm water discharges; iv. Waste Chemical Disposal - Waste chemicals such as antifreeze, degreasers and used oils shall be recycled or disposed of in an approved manner and in a way which prevents them from entering storm water discharges.

V. Storm Water Diversion - Storm water diversion away from materials manufacturing, storage and other areas of potential storm water contamination; Vi. Covered Storage or Manufacturing Areas - Covered fueling operations, materials manufacturing and storage with x1a ?3i water.

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Page 10 Modification Date: April 26, 2010 NPDES Permit No. IL0048151 Special Conditions components and goals of the storm water pollution control plan. Training should address topics such as spill response, good housekeeping and material management practices. The plan shall identify periodic dates for such training.

8. Inspection Procedures - Qualified plant personnel shall be identified to inspect designated equipment and plant areas. A tracking or follow-up procedure shall be used to ensure appropriate response has been taken in response to an inspection. Inspections and maintenance activities shall be documented and recorded.

G. The permittee shall conduct an annual facility inspection to verify that all elements of the plan, including the site map, potential pollutant sources, and structural and non-structural controls to reduce pollutants in industrial storm water discharges are accurate. Observations that require a response and the appropriate response to the observation shall be retained as part of the plan. Records documenting significant observations made during the site inspection shall be submitted to the Agency in accordance with the reporting requirements of this permit.

H. This plan should briefly describe the appropriate elements of other program requirements, including Spill Prevention Control and Countermeasures (SPCC) plans required under Section 311 of the CWA and the regulations promulgated thereunder, and Best Management Programs under 40 CFR 125.100.

I. The plan is considered a report that shall be available to the public under Section 308 (b) of the CWA. The permittee may claim portions of the plan as confidential business information, including any portion describing facility security measures.

J. The plan shall include the signature and title of the person responsible for preparation of the plan and include the date of initial preparation and each amendment thereto.

Construction Authorization K. Authorization is hereby granted to construct treatment works and related equipment that may be required by the Storm Water Pollution Prevention Plan developed pursuant to this permit.

This Authorization is issued subject to the following condition(s).

1. If any statement or representation is found to be incorrect, this authorization may be revoked and the permittee there upon waives all rights thereunder.

2. The issuance of this authorization (a) does not release the permittee from any liability for damage to persons or property caused by or resulting from the installation, maintenance or operation of the proposed facilities; (b) does not take into consideration the structural stability of any units or part of this project; and (c) does not release the permittee from compliance with other applicable statutes of the State of Illinois, or other applicable local law, regulations or ordinances.

3. Plans and specifications of all treatment equipment being included as part of the stormwater management practice shall be included in the SWPPP.

4. Construction activities which result from treatment equipment installation, including clearing, grading and excavation activities which result in the disturbance of one acre or more of land area, are not covered by this authorization. The permittee shall contact the IEPA regarding the required permit(s).

REPORTING L. The facility shall submit an annual inspection report to the Illinois Environmental Protection Agency. The report shall include results of the annual facility inspection which is required by Part G of the Storm Water Pollution Prevention Plan of this permit.

The report shall also include documentation of any event (spill, treatment unit malfunction, etc.) Which would require an inspection, results of the inspection, and any subsequent corrective maintenance activity. The report shall be completed and signed by the authorized facility employee(s) who conducted the inspection(s).

M. The first report shall contain information gathered during the one year time period beginning with the effective date of coverage under this permit and shall be submitted no later than 60 days after this one year period has expired. Each subsequent report shall contain the previous year's information and shall be submitted no later than one year after the previous year's report was

Page 11 Modification Date: April 26, 2010 NPDES Permit No. IL0048151 Special Conditions N. Annual inspection reports shall be mailed to the following address:

Illinois Environmental Protection Agency Bureau of Water Compliance Assurance Section Annual Inspection Report 1021 North Grand Avenue East Post Office Box 19276 Springfield, Illinois 62794-9276

0. If the facility performs inspections more frequently than required by this permit, the results shall be included as additional information in the annual report.

SPECIAL CONDITION 9. This permit authorizes the use of water treatment additives that were requested as part of this modification.

The use of any new additives, or change in those previously approved by the Agency, or if the permittee increases the feed rate or quantity of the additives used beyond what has been approved by the Agency, the permittee shall request a modification of this permit in accordance with the Standard Conditions - Attachment H.

The permittee shall submit to the Agency on a yearly basis a report summarizing their efforts with water treatment suppliers to find a suitable alternative to phosphorus based additives.

SPECIAL CONDITION 10. This permit may be modified to include different final effluent limitations or requirements which are consistent with applicable laws, regulations, or judicial orders. The Agency will public notice the permit modification.

SPECIAL CONDITION 11. The effluent, alone or in combination with other sources, shall not cause a violation of any applicable water quality standard outlined in 35 III. Adm. Code 302.

SPECIAL CONDITION 12. The use or operation of this facility shall be by or under the supervision of a Certified Class K operator.

SPECIAL CONDITION 13. Total Residual Chlorine shall not be discharged from any single generating units main condensers for more than two hours per day and no more than one unit in any plant shall discharge Total Residual Chlorine at any one time unless the utility can demonstrate to the Agency that the units in a particular location cannot operate at or below this level of chlorination. The reported maximum concentration of Total Residual Chlorine shall be based on a minimum of three grab samples taken at approximately five minute intervals at Outfall 001. The time samples were collected, the time and duration of the chlorine dosing period plus the amount of chlorine applied shall be reported on the Discharge Monitoring Reports. For reporting purposes, the daily discharge shall be the average of all non-zero values measured in a day and the monthly average shall be the average of all daily discharges.

Total Residual Chlorine and Total Residual Oxidant limits are an instantaneous maximum limit which shall not be exceeded at anytime.

The maximum limit when exclusively using chlorine in each unit for two hours or less in anyone day, shall be 0.2 mg /I. Any use of bromine either alone or in combination with chlorine shall be subject to a Total Residual Oxidant limit of 0.05 mg /I. All samples for Total Residual Chlorine/Total Residual Oxidant shall be analyzed by an applicable method contained in 40 CFR 136, equivalent in accuracy to low-level amperometric titration. Any analytical variability of the method used shall be considered when determining the accuracy and precision of the results obtained.

For the purposes of determining compliance, the highest single instantaneous Total Residual Chlorine /Total Residual Oxidant concentration measured during compliance curve sampling on any day will be regarded as the daily maximum concentration. Total residual oxidant concentration shall be measured and reported in terms of total residual chlorine.

Discharge Monitoring Reports shall indicate whether chlorine or bromine compounds were used during the month.

SPECIAL CONDITION 14. Samples taken in compliance with the effluent monitoring requirements shall be taken at a point representative of the discharge, but prior to entry into the receiving stream.

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