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ILLINOIS ENVIRONMENTAL PROTECTION AGENCY

October 24, 2007

CLERK'S

OFFICE

Ameren Energy Generating Company

Coffeen Power Station

Petitioner,

ILLINOIS ENVIRONMENTAL

PROTECTION AGENCY,

Respondent.

NOV 0 8 2007

STATE

ollution

Control

ILLINOISBoard

IEPA –

08-6

(Provisional Variance-Water)

Re: Provisional

Variance From Special Condition 5

of NPDES Peimit IL0000108

Dear Mr. Menne:

The Illinois Environmental Protection Agency (Agency) has completed its technical review of

the attached provisional variance request (Attachment A) submitted by Ameren Energy

Generating Company (Ameren) for its Coffeen Power Station (Coffeen Station) on October 22,

2007.

Based on the review, the Agency GRANTS the requested variance, subject to specific conditions

set forth below, for a period of 45 days.

Ameren's Coffeen Station is a two-unit 950 MW coal-fired steam generating station located

approximately two miles south of Coffeen, Illinois, on the east shore of the main body of

Coffeen Lake. Coffeen Lake, which is about 1,100 acres in size, provides cooling and service

water for the generating station. A once-through cooling system is used to cool the main

condensers of each unit and this condenser cooling water is then discharged to Coffeen Lake for

dissipation of waste heat.

Due to the extremely hot humid and dry weather conditions, the Coffeen Lake level has fallen 7

feet below nounal pool. As a consequence, the capacity of the lake to dissipate heat has been

drastically reduced. Based on both current conditions in the lake and historical data, it is

predicted that there will be periods of time that the temperatures measured will be at or above the

theunal limits of NPDES permit IL0000108. In order to meet Special Condition 5 of its NPDES

permit (Attachment B) Ameren has lowered loads at Coffeen Station, when possible, over

weekends; deliberately scheduled an outage to coincide with the more restrictive October

temperature regime; and removed a unit from service to help reduce thermal loading.

Additionally, Ameren added 42 supplemental cooling towers in 2001, and is currently operating

four solar-powered aeration pumps in the lake to draw water from the bottom to the top in an

attempt to cool the water. The only alternative Ameren has to maintain Coffeen Station's permit

limits is to shut down or significantly de-rate its generating units for the remainder of the month.

NPDES permit IL0000108 requires Coffeen Station not to exceed 89 degrees F as a monthly

average from October through May and 94 degrees as a daily maximum for more than two

percent of the hours during that same period. Ameren is requesting a provisional variance that

allows Coffeen Station's discharge to average 93 degrees F as a monthly average for a period of

45 additional days starting on October 1, 2007 (ending date would be November 14, 2007).

Ameren also requests relief from the maximum permitted temperature for an additional 60 hours

during this period of time. In granting this relief, the Agency would start the provisional

variance on October 23, 2007, the date it received Ameren's request, and the provisional

variance would continue through November 14, 2007.

The Agency has reviewed the requested provisional variance and has concluded the following:

The environmental impact from the requested relief will be closely monitored and the

Agency will be immediately notified of any significant impact along with actions taken to

remedy the problem;

2. No other reasonable alternatives appear available;

3. No public water supplies will be affected;

4. No federal regulations will preclude the granting of this request; and

Ameren will face an arbitrary and unreasonable hardship if the request is not granted.

The Agency hereby GRANTS Ameren's Coffeen Station a provisional variance from Special

Condition 5 of NPDES Peimit IL0000108, subject to the following conditions:

This variance will begin October 23, 2007, and will end November 14, 2007;

During the variance period Coffeen Station's theinial discharge to Coffeen Lake shall

not result in a temperature measured at the outside edge of the mixing zone in Coffeen

Lake to exceed 93 degrees F as a monthly average and 94 degrees F as a maximum for

an additional 60 hours during the provisional variance period;

This variance is subject to the following conditions:

During the variance period Coffeen Station shall continuously monitor intake and

discharge temperatures and visually inspect intake and discharge areas at least

three times daily to assess any mortalities to fish and other aquatic life;

Coffeen Station shall document environmental conditions during the term of the

provisional variance, including the activities described in A above of this Section,

and submit the documentation to the Agency and the Department of Natural

Resources within 30 days after the provisional variance expires;

Coffeen Station shall immediately notify the Agency and the Department of

Natural Resources of any unusual conditions, including mortalities to fish or other

aquatic life; to immediately take action to remedy the problem; to investigate and

document the cause and seriousness of the unusual conditions while providing

updates to the Agency and the Department of Natural Resources as changes occur

until normal conditions return; to notify the Agency and the Department of

Natural Resources when normal conditions return; and to submit the

documentation to the Agency and the Department of Natural Resources within 30

days after normal conditions return;

Coffeen Station shall develop and implement a response and recovery plan to

address any adverse environmental impact due to thermal conditions resulting

from the provisional variance, including loss and damage to aquatic life;

Coffeen Station shall continue use of the solar powered aeration pumps during

the variance period;

Coffen Station shall implement all reasonable measures possible to reduce

temperature of all discharges to Coffeen Lake;

Coffeen Station shall notify Roger Callaway of the Agency by telephone at

217/782-9720 when the need for the provisional variance begins and again when

the need ends. Written confirmation of each notice shall be sent within five days

to the following address:

Illinois Environmental Protection Agency

Bureau of Water - Water Pollution Control

Attention: Roger Callaway

1021 North Grand Avenue East, MC #19

Springfield, Illinois 62794-9276

Coffeen Station shall sign a certificate of acceptance of this provisional variance

and forward that certificate to Roger Callaway at the address indicated above

within one day of the date of this order. The certification should take the

following foini:

I (We)

, hereby accept and agree to be bound by all terms

and conditions of the provisional variance granted by the Agency in

I. Coffeen Station shall continue to monitor and maintain compliance with all other

parameters and conditions specified in its NPDES Permit No. IL0000108.

The Agency grants this provisional variance in accordance with its authority contained in

Sections 35(b), 36 (c), and 37(b) of the Illinois Environmental Protection Act (415 ILCS 5/35(b),

36(c), and 37(b) (2004). The decision to grant this provisional variance is not intended to

address compliance with any other applicable laws or regulations.

Environmental, Safety & Health

314.554.2816 (Phone)

314.554.4182 (Facsimile)

St. Louis, MO 63166-6149

314621.3222

October 22, 2007

wAmeren

Mr. Roger Callaway, Bureau of Water

Manager, Compliance Assurance Section

Division of Water Pollution Control

Illinois Environmental Protection Agency

1021 North Grand Avenue East

Springfield, Illinois 62794

Re: Coffeen Power Station

NPDES Permit No. IL0000108

Provisional Variance Request

Dear Mr. Callaway:

Ameren Energy Generating Company ("Ameren") hereby requests that a

provisional variance be granted for its Coffeen Power Station ("Coffeen" or

"Station") as provided for by Title IX, Section 35(b) of the Illinois Environmental

Protection Act ("Act"), 415 ILCS 5/35. Ameren submits this Emergency

Application for a Provisional Variance consistent with the procedures set forth at

35 Ill. Adm. Code 180.204. Specifically, Ameren requests 45 additional days

during which Coffeen will be allowed to average 93 degrees Fahrenheit from the

Station via the discharge flume, NPDES Permit IL0000108 outfalls 001, 020, 021

and/or 022. Ameren also requests relief from the maximum permitted temperature

for an additional 60 hours. Based on past and current heat conditions, yearly

precipitation levels and if unseasonably warm temperatures continue to persist,

Coffeen will be unable to meet its permitted monthly temperature average of 89

degrees Fahrenheit for the month of October 2007.

Station Description

The Coffeen Power Station is an existing 950 MW coal fired steam-generating

station located in Montgomery County, Illinois. The Station discharges

wastewater pursuant to NPDES Permit No. IL0000108, issued by Illinois. EPA on

March 8, 2002 ("NPDES Permit"). Cooling and service water for the Station is

provided by Coffeen Lake, which occupies roughly 1,100 acres. "Once-through"

cooling systems are used to cool the main condensers of the plants two units, and

a subsidiary ul Ameren Cniboranon

condenser cooling water is discharged from the units to Coffeen Lake for

dissipation of waste heat through outfalls 001, 020, 021 and/or 022.

In order to reduce thermal loading, the Company has installed 48 supplemental

cooling towers that take water from the condenser cooling water diversion channel

("the flume") and discharge it to Coffeen Lake via the supplemental cooling tower

discharge, outfall 022. In addition, 8 solar-powered aeration pumps called "solar

bees" draw cooler water from the bottom of the cooling basin and are discharged

from the top of the cooling device. In spite of these efforts, the restrictive

temperature regime applicable to the Station commencing in October is resulting in

the curtailment of normal operations without corresponding environmental benefit.

Permit Conditions

Special Condition 5 of the NPDES Permit contemplates thermal limitations for two

distinct periods. Temperatures are measured by a fixed temperature recorder set at

the edge of the designated mixing zone and below the surface of water. During

the June 01 – September 30 period ("summer months"), the following thermal

conditions apply:

The thermal discharge to Coffeen Lake from Coffeen

Power Station shall not result in a temperature

measured at the outside edge of the mixing zone in

Coffeen Lake, which: Exceeds 105°F as a monthly

average from June through September and 112°F as

a maximum for more than three percent of the hours

during the same period.

Commencing October 1 and continuing through May 31, the

following restrictions are in effect:

The thermal discharge to Coffeen Lake from Coffeen

Power Station shall not result in a

temperature measured at the outside edge of the

mixing zone in Coffeen Lake, which:

Exceeds 89°F as a monthly average from October

through May and 94°F as a maximum for more than

two percent of the hours during the same period.

Pursuant to the above requirements, Ameren may not exceed the maximum

averages for more than 87 hours during the summer, and 117 hours for the balance

of the year. In practice, these hours provide a limited "safe harbor" during the

transition month of October and in May when the weather can fluctuate

dramatically.

While the required monthly average drops from 105 °F on September 30, to 89 °F on

October 1, and as experienced this year, ambient temperatures do not necessarily drop as

dramatically.

Requested Relief

Ameren requests a provisional variance from Special Condition 5 that allows

Coffee Station's discharge temperature to average 93 °F as a monthly average for a

period of 45 additional days starting on or about October 1, 2007. Ameren further

requests relief from the maximum permitted temperature for an additional 60

hours.

Necessity for Request

2007 has been a very unique year in terms of both heat and lack of precipitation

which are the primary drivers for requesting this provisional variance.

Precipitation across the central part of Illinois remains below other portions of our

State. In fact, under normal conditions, the average yearly rainfall by October is

around 36 inches. However, in 2007, precipitation to date is only around 31.5

inches, well-below normal rainfall conditions. Thus, as of October 18, 2007,

central Illinois is in a drought.

As a consequence of the hot and humid weather conditions and drought during

September and October, Coffeen Lake has lowered to 583 feet. Appended hereto

is a chart of the lake levels and rainfall on a monthly basis for the Coffeen Station,

collected by Ameren from January, 2007 to the present. See Exhibit 1. This chart

reflects the existence of drought-like conditions. Based on current estimates, the

Coffeen Lake level is currently 7 feet below normal pool. As a result, the capacity

of Coffeen Lake to dissipate heat has been drastically reduced beyond its normal

capabilities.

As indicated, Special Condition 5 of the NPDES Permit limits the temperature that

is measured at the outside edge of the mixing zone in Coffeen Lake. Appended

hereto is a chart that depicts the lake temperatures recorded at the edge of the

mixing zone. See Exhibit 2. Due to unseasonably warm weather, Ameren has

consumed nearly 60 hours of its bank. Unless relief from the monthly average of

89 °F is granted, Ameren's ability to provide full generation for the remainder of

this month and potentially the month of November 2007 will be severely

compromised. In fact, Ameren estimates that measured temperatures within

Coffeen Lake will need to stay below 87 °F in order to comply with the designated

permit conditions.

Moreover, historical data indicates that environmental conditions in October will

continue to result in accumulation of days in which discharge temperatures will

exceed an average of 89 °F. Therefore, Ameren expects no relief from the elevated

temperatures of Lake Coffeen for at least another three weeks.

Assessment of Environmental Impacts

The relief requested herein will not have an adverse impact on the Coffeen Lake

fisheries. The thermal impact of the requested provisional variance with respect to

both the near-field and far-field aquatic community is expected to be minimal.

Ameren monitors the Coffeen Lake for large-scale fish mortalities and none have

been observed. Lake temperatures are such that fish mortalities are not expected.

Moreover, Ameren has fully advised field staff from the Illinois Department of

Natural Resources (IDNR) of the circumstances surrounding the variance request

and the field staff did not express opposition or concern. In the unlikely event fish

mortality does occur, Ameren will re-stock or perform other appropriate

compensatory measures as directed by IDNR arid IEPA.

Moreover, because Coffeen is not proposing to increase cooling water flows or

increase the temperature of the condenser cooling water discharge, resident fish

species have already acclimated to the existing discharge temperature. Resident

fish species will not be subject to any heat shock as a result of increasing the

allotment of time for which the plant can discharge above the 89 °F average

temperature. In addition, because the fish are acclimated to the existing discharge

temperature, any sudden drop in lake temperature due to de-rating or taking the

Station off-line could cause negative effects on resident fish species. The DNR

filed staff was particularly concerned with this potential and the certain

temperature increase that would occur when units that were taken off-line are

subsequently started up.

Alternatives to Requested Relief

Ameren evaluated options prior to seeking regulatory relief to attempt to meet the

limit from which the variance is requested. As a rule, Coffeen Station employs a

variety of operational practices to maintain compliance with the restrictions of

Special Condition 5 of the NPDES Permit. In order to stay within its permit limits,

the Company periodically adjusts its operations as appropriate. In fact, the

Company deliberately scheduled an outage to coincide with the more restrictive

October temperature regime and removed a unit from service to help reduce

thermal loading. Additional mitigation efforts include lowering load, when

possible, over the weekends. A robust maintenance program on the Station's

cooling towers is also ongoing, and "solar bees" have been installed to circulate

water from the bottom portion of Coffeen's Cooling Basin to the top to facilitate

cooling.

Nonetheless, unless a provisional variance is issued, the Station will be required to

shut down or significantly de-rate its generating units for the remainder of the

month in order to comply with the monthly average requirements of the permit.

Although operational practices instituted by Ameren at Coffeen Station have

helped with compliance efforts to date, such efforts are not enough to address the

consequences of extreme weather conditions that are out of the control of Ameren

and the Agency.

Moreover, Coffeen falls within the footprint of MISO, an eleven-state regional

transmission operator. Ameren does not control the dispatch of its generating

units. MISO controls the actual dispatch of the units based upon a series of

commercial factors including cost-effectiveness and availability. Based upon these

factors, MISO regularly and continually calls upon the Coffeen units for generation

output. The unavailability of generating units for dispatch means that MISO will

necessarily call upon a less cost-effective generating source, which ultimately will

be reflected in the power prices paid for by consumers.

Mitigation to be Undertaken During Variance Period

During the period covered by the Provisional Variance, should it be granted,

Coffeen will do the following:

Continuously monitor the intake and discharge temperatures and assess

water temperatures at the edge of the mixing zone specified in Special

Condition 5 of the NPDES Permit;

Inspect Coffeen Lake three times weekly to assess any mortality to fish and

report the results of the monitoring activities to the Illinois EPA and Illinois

Department of Natural Resources within 30 days of the expiration of the

Provisional Variance;

Immediately notify the Agency and the Illinois Department of Natural

Resources of any unusually severe conditions, including a high number of

fish mortalities and agree to assess options for addressing such unusually

severe conditions; and

Continue the use of "solar bees" during the variance period to encourage

more robust mixing within Coffeen's Cooling Basin.

Summary

Ameren seeks relief from Special Condition 5 of the NPDES Permit as described

above. Ameren believes that a denial of this Provisional Variance Request will

impose an arbitrary and unreasonably hardship without corresponding

environmental benefit. Ameren does not make this request lightly and appreciates

Illinois EPA's consideration of this request.

There is no other provisional variance relief in effect at this time for the Coffeen

Station.

Please feel free to contact me with any questions or concerns you may have.

Very truly yours,

Michael L.L.

Menne, Vice President

Environmental

cc: Marcia

Willhite, Chief, Bureau of Water

Darin LeCrone, Bureau of Water

Connie Tonsor, Division of Legal Counsel

EXHIBIT

Coffeen Lake Level and Rainfall

2007

Lake Level — Rainfall

8T-141$6:tit

LII

8 8

TRV

88TT

4040

00-

000 0

„„„

$T8gMVSMWM85MM3TMS*358

RENEE CIPRIANO, DIRECTOR

ILLINOIS ENVIRONMENTAL PROTECTION AGENCY

1021 NORTH GRAND AVENUE EAST, P.O. Box 19276, SPRINGFIELD, ILLINOIS 62794-9276

Ameren Energy Generating Company

One Ameren Plaza

1901 Chouteau Avenue

Post Office Box 66149

St. Louis, Missouri 63166-6149

Re: Ameren Energy Generating Company

Coffeen Power Station

NPDES Permit No. IL0000108

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:

1. To add one new outfall (outfall 022) to the existing peiiiiit. The new outfall is being added to

the permit as a result of 12 new supplemental cooling towers.

2. Delete stormwater outfall 007 as its discharge will now combine with outfall 008 to discharge to

Coffeen Lake.

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.

GEORGE H. RYAN, GOVERNOR

Wf-e?C

' Thomas G. McSwiggin, P.E.

Manager, Permit Section

Division of Water Pollution Control

NPDES Permit No. IL0000108

Illinois Environmental Protection Agency

Division of Water Pollution Control

1021 North Grand Avenue East

Post Office Box 19276

Springfield, Illinois 62794-9276

NATIONAL POLLUTANT DISCHARGE ELIMINATION SYSTEM

Modified (NPDES) Permit

Expiration Date: September 30, 2003

Name and Address of Permittee:

Ameren Energy Generating Company

One Ameren Plaza

1901 Chouteau Avenue

Post Office Box 66149

St. Louis, Missouri 63166-6149

Discharge Number and Name:

No. 008, 009, 010, 011, 012, 013, 014, 015 , 016

Storm Water Runoff from Rail Spur

Issue Date: September 28, 1998

Effective Date: October 1, 1998

Modification Date:

March 8, 2002

Modification Effective Date:

March 8, 2002

Facility Name and Address:

Coffeen Power Station

134 CIPS Lane - Box 306

Coffeen, Illinois 62017

(Montgomery County)

Receiving Waters:

Coffeen Lake

Condenser Cooling Water Flume Discharge

Condenser Cooling Water Diversion Channel Overflow

Condenser Cooling Water Supplemental Cooling Pond Overflow

Condenser Cooling Water Supplemental Cooling Tower Discharge

Boiler Draining Wastewater

Electrodialysis Reversal and Demineralizer Regenerant Wastes

Unit 1 Floor Drains and Sumps

Sewage Treatment Plant Discharge

Unit 2 Floor Drains and Sumps

Equalization Tank Bypass Line Discharge

Coal Yard Settling Pond Discharge

Intake Screen Backwash

Storm Water Runoff from Tractor Shed Area

In compliance with the provisions of the Illinois Environmental Protection Act, Title 35 of III. 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.

Page 2

Modification Date: March 8, 2002

TGM:UF:00042902.bah

NPDES Permit No. 1L0000108

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:

Outfall(s): 001, 020, 021 and 022

This discharge consists of:?

Approximate Flow:

Main condenser cooling water?

370.0 MGD

Various heat exchanger cooling water discharges

33.72 MGD

Boiler draining

Intermittent

Electrodialysis reversal and demineralizer regenerant waste?

0.224 MGD

Sewage treatment plant effluent

0.006 MGD

Maintenance shop oil/water separator discharge

Intermittent

Equalization tank bypass line discharge

Intermittent

8. Stormwater runoff*

Intermittent

9. Chemical containment area drains

Intermittent

10. Unit 1 floor drains and sumps**

0.072 MGD

11.

Unit 2 floor drains and sumps**

0.072 MGD

12.

Unit 1 and 2 crib house sumps

0.010 MGD

Flow

pH?

See Special Condition No. 2

Total Residual Chlorine?

See Special Condition No. 4

Temperature?

See Special Condition No. 5

* See Special Condition 15.

These contributory waste streams are routed through an oil/water separator prior to discharge.

Flow shall be sampled daily by continuous recording at 001, 020, 021 and 022 when discharging.

pH shall be sampled 2/month when discharging. Sampling point for 001, 020 and 022 shall be at a point within the cooling water discharge

flume. Sampling point for 021 and 022 shall be at the supplemental cooling pond overflow, prior to discharge to Coffeen Lake.

Total residual chlorine shall be sampled 2/month when discharging. Sampling point for 001, 020, 021 and 022 shall be at a point within •

the cooling water discharge flume.

Temperature shall be sampled daily by continuous recording at the edge of the mixing zone in Coffeen Lake.

Page 3

Modification Date:

March 8, 2002

NPDES Permit No. IL0000108

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:

Outfall(s): A01 Boiler Draining Wastewater?

Approximate Flow: Intermittent

Flow

Total Suspended Solids

Outfall(s): B01"*" Electrodialysis Reversal and Demineralizer

Regenerant Wastes

This discharge consists of:

Approximate Flow:

Electrodialysis Reversal and Demineralizer

0.224 MGD

Regenerant Wastes

Chemical Containment Area Drains

Total Suspended Solids?

15.0? 30.0? 2/Month?8-Hr. Composite

Total Dissolved Solids?

See Special Condition No. 6

***These waste streams are routed to an 80,000 gallon capacity equalization tank prior to discharge to the cooling water discharge flume.

Pace 4

Modification Date: March 8, 2002

NPDES Permit No. IL0000108

Effluent Limitations and Monitoring

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:

Outfall(s): C01 Unit 1 Floor Drains and Sumps****

This discharge consists of:

Approximate Flow:

Floor drains and sump discharges

2/Month? 24-Hr. Total

Total Suspended Solids?

"***Outfall C01 includes storm water associated with industrial activity which comes into contact with the floor drain and sump discharges

prior to discharge into the receiving stream. The above limitations and monitoring requirements apply only to the floor drain and sump

discharges. For requirements concerning the storm water portion of the discharge, see Special Condition No. 15.

Outfall(s): DO1 Sewage Treatment Plant Discharge (DMF 0.03 MGD)

See Special Condition No. 2?

2/Month?

Grab

Total Suspended Solids 4.5

Total Residual Chlorine?

See Special Condition No. 7?

Daily?

Grab

Outfall(s): E01 Unit 2 Floor Drains and Sumps*****

This discharge consists of:

Approximate Flow:

Floor drains and sump discharges

Total Suspended Solids

*****Outfall E01 includes storm water associated with industrial activity which comes into contact with the floor drain and sump discharges

prior to discharge into the receiving stream. The above limitations and monitoring requirements apply only to the floor drain and sump

discharges. For requirements concerning the storm water portion of the discharge, see Special Condition No. 15.

See Special Condition No. 17

Page 5

Modification Date: March 8. 2002

NPDES Permit No. 1L0000108

Effluent Limitations and Monitoring

? DAILY? 30 DAY? DAILY? SAMPLE?

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:

Outfall(s): G01"**?

Equalization Tank Bypass Line Discharge

This discharge consists of:?

Approximate Flow:

Electrodialysis Reversal and Demineralizer

0.224 MGD

Regenerant Wastes

Chemical Containment Area Drains

Total Suspended Solids

******The Permittee shall restrict the use of the bypass of the equalization tank to required maintenance of the tank and once bypassing

commences such maintenance shall be promptly undertaken to minimize the length of time of bypass of the equalization tank.

Page 6

Modification Date: March 8, 2002

NPDES Permit No. 1L0000108

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:

Outfall(s): 002 Coal Yard Settling Pond Discharge

This discharge consists of:?

Approximate Flow:

1. Runoff from the coal yard*******?

Intermittent

Water treatment clarifier and filter wastes

0.06 MGD

Coal crusher house sump pit discharge

Intermittent

Ash dewatering bin overflows

Intermittent

Tractor shed floor drains

Intermittent

Coal recovery pond effluent?

Intermittent

Emergency overflow from recycle pond ?

Intermittent

Ultrasonic resin cleaner backwash?

0.004 MGD

Flow

1/Week

See Special Condition No. 2

1/Week

Total Suspended Solids

See Special Condition No. 8

1.8

1/Month

Total Dissolved Solids

See Special Condition No. 8

1300.0

1/Month

Manganese

See Special Condition No. 8

******" See Special Condition No.

Outfall(s): 003 Intake Screen Backwash

Approximate Flow: 0.07 MGD

Adequate maintenance of the trash basket is required to prevent the discharge of debris collected on intake screens back to Coffeen Lake.

Page 7

Modification Date:

March 8, 2002

NPDES Permit No. IL0000108

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:

Outfall(s): 005 Storm Water from Tractor Shed Area

See Special Condition No. 15

Outfall(s): 008, 009, 010, 011, 012, 013, 014, 015 and 016

Storm Water Runoff from Rail Spur

See Special Condition No. 15, 18 and 19

Flow shall be reported as monthly average and daily maximum on the DMR form.

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.

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. For internal outfalls A01, B01, C01, 001, E01 and G01, samples taken in

compliance with effluent monitoring requirements shall be taken at a point representative of the discharge, but prior to entry into the cooling

water discharge flume.

SPECIAL CONDITION 4.

Total Residual Chlorine limit is an instantaneous maximum limit which shall not be exceeded at any time.

Chlorine may not be discharged from each unit's main cooling condensers for more than two hours in any one day.

A minimum of three grab samples shall be taken at approximately two minute intervals at a point in the discharge flume during the

respective chlorination period of each unit allowing for lag time between the initiation of chlorination and the point of sampling before

the first grab sample is taken. The individual values of total residual chlorine for each chlorination period sampled shall be reported.

The highest individual TRC value for the month should be reported as the maximum value on the Discharge Monitoring Report (DMR).

The time and duration of the chlorine dosing period plus the amount of chlorine applied shall be included with the monthly DMR.

Continuous analyzers may be substituted for the above grab sampling method . When continuous analyzers are used, calculations

submitted with the Discharge Monitoring Reports (DMRs) will be based on the data collected on the first and third Wednesday of the

calendar month. In the event of an analyzer malfunction on the above days, data will be collected on the following Wednesday by

either an analyzer or by use of the grab sampling method. Discharge Monitoring and Reporting requirements are specified above.

SPECIAL CONDITION 5.

The following specific thermal limitations adopted through IPCB Order 77-158 pursuant to 35 III. Adm. Code

302.211(j)(5) shall apply at the edge of the mixing zone for the condenser cooling water discharge. The edge of the mixing zone shall be

a maximum area of 26 acres and compliance with the following thermal limitations determined by a fixed temperature recorder set at the

edge of the mixing zone below the surface of the water.

1. The thermal discharge to Coffeen Lake from Central Illinois Power Company's Coffeen povr station shall not result in a temperature,

measured at the outside edge of the mixing zone in Coffeen Lake, which: 1) Exceeds 105 F as a monthly average from June through

September, and 112 F as a maximum for more th0an three percent of the hours during that same period. 2) Exceeds 89 F as a

monthly average from October through May, and 94 F as a maximum for more than two percent of the hours during that same period.

The maximum instantaneous temperature recorded during a day shall be reported as the daily maximum temperature on the DMR form.

The monthly average temperature shall be reported as the monthly average on the DMR form. The number of hours the temperature

exceeds the maximum temperature limitation shall be reported in the comment section of the DMR form.

SPECIAL CONDITION 6.

This waste stream shall not alone or in combination with other sources cause a violation of the applicable total

dissolved solids water quality standard of 1000 mg/I in Coffeen Lake. Monitoring shall be of a representative lake water sample collected

at the Station intake.

SPECIAL CONDITION 7.

Any use of chlorine to control slime growths, odors or as an operational control, etc. shall not exceed the limit

of .05 mg/I (daily maximum) total residual chlorine in the effluent. Sampling is required on a daily grab basis during the chlorination process.

Reporting shall be submitted with the (DMR's) on a monthly basis.

SPECIAL CONDITION 8.

As part of the review process for this permit, the Agency concluded that adequate mixing exists in compliance

with 35

III. Adm. Code 302.102 for boron, manganese and total dissolved solids at outfall 002. The extent of the mixing zone for these

parameters is a radius of 100 feet from the end of the outfall 002 discharge pipe into Coffeen Lake. The daily maximum limits given for

these parameters were established to result in compliance with the water quality standards of 35 III. Adm. Code 302 outside of these

maximum zones. All parameters known to be present in the effluents at levels above water quality standards are listed above. Other such

parameters may be

discovered in the future and will

be evaluated for mixing according to the Illinois Permitting Guidance for Mixing Zones.

SPECIAL CONDITION 9.

Central Illinois Public Service Company's demonstration for the Coffeen Power Station in accordance with

Section 316(b) of the Clean Water Act was approved by this Agency by letter dated April 27, 1982. it is determined that no additional intake

monitoring or modification is now being required for reissuance of this NPDES permit.

Page 9

Modification Date:

March 8, 2002

NPDES Permit No. IL0000108

Special Conditions

SPECIAL CONDITION 10.

There shall be no discharge of polychlorinated biphenyl compounds (PCBs) such as those commonly used

for transformer fluid.

SPECIAL CONDITION 11.

Chemical metal cleaning wastewater may be stored in an on-site tank until placement on an active area of the coal pile. Chemical

metal cleaning wastewater may be placed on an active area of the coal pile for evaporation in an operating boiler provided a

demonstration showing BAT equivalency is submitted to the IEPA within 90 days following completion of treatment. This demonstration

will consist of a sampling program approved by the IEPA which will provide for the monitoring of iron and copper levels in coal pile

runoff prior to, during, and after placement of rinses onto the coal pile. This monitoring must show that the naturally occurring iron and

copper levels in coal pile runoff are not altered through this disposal practice (Attachment A).

B. Chemical metal cleaning wastewater may be discharged to the recycle pond following treatment. The following discharge limits and

sampling requirements shall apply prior to discharge to the recycle pond:

*When discharging. Sample results shall be included on the monthly Discharge Monitoring Report.

SPECIAL CONDITION 12.

Permitted discharges which will not have discharge monitoring requirements include No. F01 maintenance shop

oil/water separator discharge which will require best management practice (BMP) maintenance schedule and No. 004 maintenance building

sewage treatment plant discharge which is regulated by the Illinois Department of Public Health because of the treatment unit's small size.

SPECIAL CONDITION 13.

The permittee shall record monitoring results on Discharge Monitoring Report forms using one such form for

each discharge each month. The completed Discharge Monitoring Report form shall be submitted monthly to IEPA, no later than the 28th

of the following month, unless otherwise specified by the Agency, to the following address:

Illinois Environmental Protection Agency

Bureau of Water

Compliance Assurance Section

1021 North Grand Avenue East

Post Office Box 19276

Springfield, Illinois 62794-9276

SPECIAL CONDITION 14. The Agency has determined that the effluent limitations in this permit constitute BAT/BCT for storm water which

is treated in the existing treatment facilities for purposes of this permit reissuance, and no pollution prevention plan will be required for such

storm water. In addition to the chemical specific monitoring required elsewhere in this permit, the permittee shall conduct an annual

inspection of the facility site to identify areas contributing to a storm water discharge associated with industrial activity, and determine

whether any facility modifications have occurred which result in previously-treated storm water discharges no longer receiving treatment.

If any such discharges are identified the permittee shall request a modification of this permit within 30 days after the inspection. Records

of the annual inspection shall be retained by the permittee for the term of this permit and be made available to the Agency on request.

SPECIAL CONDITION 15.

STORM WATER POLLUTION PREVENTION PLAN (SWPPP)

A. A storm water pollution prevention plan shall be developed 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.

Page 10

Modification Date: March 8, 2002

NPDES Permit No. IL0000108

Special Conditions

The plan shall be completed within 180 days of the effective date of this permit. Plans shall provide for compliance with the terms

of the plan within 365 days of the effective date of this permit. The owner or operator of the facility shall make a copy of the plan

available to the Agency at any reasonable time upon request. [Note: If the plan has already been developed and implemented it shall

be maintained in accordance with all requirements of this special condition.]

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.

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.

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:

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.

A site map showing:

The storm water conveyance and discharge structures;

ii.

An outline of the storm water drainage areas for each storm water discharge point;

ii.?

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.

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:

The nature of the industrial activities conducted at the site, including a description of significant materials that are treated,

stored or disposed of in a manner to allow exposure to storm water;

Materials, equipment, and vehicle management practices employed to minimize contact of significant materials with

storm water discharges;

In.

Existing structural and non-structural control measures to reduce pollutants in storm water discharges;

iv.

Industrial storm water discharge treatment facilities;

Methods of onsite storage and disposal of significant materials;

Page 11

Modification Date:

March 8, 2002

NPDES Permit No. IL0000108

Special Conditions

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

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.

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

oil/water 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 clean 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:

Containment - Storage within berms or other secondary containment devices to prevent leaks and spills from entering

storm water runoff;

i.?

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:

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 areas to

prevent contact with storm water.

Sediment and Erosion Prevention - The plan shall identify areas which due to topography, activities, or other factors, have a

high potential for significant soil erosion and describe measures to limit erosion.

Employee Training - Employee training programs shall inform personnel at all levels of responsibility of the 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.

Page 12

Modification Date: March 8, 2002

NPDES

Permit No. IL0000108

Special Conditions

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.

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.

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.

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.

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 developed pursuant to this permit.

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

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

all rights thereunder.

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.

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

in the SWPPP.

Construction activities which result from treatment equipment installation, including cleaning, grading and excavation activities which

result in the disturbance of five acres 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 due.

Page 13

Modification Date:

March 8, 2002

NPDES Permit No. IL0000108

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

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 16. If an applicable effluent standard or limitation is promulgated under Sections 301(b)(2)(C) and (D), 304(b)(2),

and 307(a)(2) of the Clean Water Act and that effluent standard or limitation is more stringent than any effluent limitation in the permit or

controls a pollutant not limited in the NPDES Permit, the Agency shall revise or modify the permit in accordance with the more stringent

standard or prohibition and shall so notify the permittee.

SPECIAL CONDITION 17. The permittee shall monitor the discharge from outfall E01 for zinc once per month by eight hour composite

sample. Monitoring results shall be reported on the DMR form. The IEPA may modify this permit during its term to incorporate additional

limitations or requirements based on the results of this monitoring. Modifications under this condition shall follow public notice and

opportunity for hearing.

SPECIAL CONDITION 18. The discharge from outfalls 008, 009, 010 and 012 shall be monitored for boron, manganese, total dissolved

solids and sulfate during qualifying storm events. The outfalls shall be monitored semiannually, in the spring and fall quarters, and at

additional times as necessary to ensure that two qualifying storm events are sampled per year at each outfall. A qualifying storm event

is defined as an event that is greater than 0.1 inches and at least 72 hours from the previously measurable (greater than 0.1 inch rainfall)

storm event.

grab sample shall be taken during the first thirty minutes of the discharge (or as soon thereafter as practicable), and a flow weighted

composite shall be taken for the entire event or for the first three hours of the event.

Grab and composite samples are defined as follows:

Grab sample: An individual sample of at least 100 milliliters collected during the first thirty minutes (or as soon thereafter as practicable)

of the discharge. This sample is to be analyzed separately from the composite sample.

Flow-Weighted Composite sample: A flow-weighted composite sample may be taken with a continuous sampler that proportions the

amount of sample collected with the flow rate or as a combination of a minimum of three sample aliquots taken in each hour of discharge

for the entire event or for the first three hours of the event, with each aliquot being at least 100 milliliters and collected with a minimum

period of fifteen minutes between aliquot collections. The composite must be flow proportional; either the time interval between each aliquot

or the volume of each aliquot must be proportional to either the stream flow at the time of sampling or the total stream flow since the

collection of the previous aliquot. Aliquots may be collected manually or automatically.

Pollutants shall be analyzed using test methods promulgated in 40 CFR 136. For each qualifying event, permittee shall record flow

measurements or estimates of flow rate, the total amount of discharge for the storm event sampled, and the method of flow measurement

or estimation. Permittee shall also record the duration of storm event sampled, rainfall measurements, or estimates of the storm event

which generated the sampled runoff and the duration between the storm event sampled and the end of the previously measurable (greater

than 0.1 inch rainfall) storm event.

Monitoring results and all other information required by this condition shall be submitted upon your receipt as an attachment to the DMR

form.

The IEPA may modify this permit during its term to incorporate additional limitations or requirements based on the results of this monitoring.

Modifications under this condition shall follow public notice and opportunity for hearing.

Page 14

Modification Date: March 8, 2002

NPDES Permit No. IL0000108

pecial

Conditions

SPECIAL CONDITION 19.

Based on monitoring results submitted to the IEPA for outfails 008-010 and 012 the permittee shall modify its

existing Storm Water Pollution Prevention Plan to reduce the amount of pollutants discharged to Coffeen Lake. At a minimum, the

permittee shall increase the frequency of coal removal activities along the rail spur.

Amendments to the Storm Water Pollution Prevention Plan shall be made within the shortest reasonable period of time, and shall be

provided to the IEPA for review upon request.

Page 15

Modification Date:

March 8. 2002

NPDES Permit No. IL0000108

Attachment A

The Permittee shall monitor coal pile runoff for concentrations of copper (total) and iron (total) a minimum of 4 times prior to placing

chemical metal cleaning wastewater rinses on the coal pile. The Permittee shall monitor the coal pile for coal pile runoff following the

placement of chemical metal cleaning wastewater rinses on the coal pile. Upon placement of the wastewater rinses on the coal pile, for

each placement which causes an effluent from the coal pile and each rainfall event which produces coal pile runoff during 30 days following

placement on the coal pile, a representative grab sample shall be taken daily of the discharge and analyzed for iron (total) and copper

(total). The analysis report shall include the frequency, duration and amounts of the month's precipitation events.

If the Permittee after monitoring twice the above practice for incineration of chemical metal cleaning wastewater rinses can demonstrate

to the satisfaction of the permitting authority that there is no significant discharge of the designated parameters caused by this practice,

upon written request by the Permittee, the permitting authority shall review the monitoring requirements and may, at their discretion revise

or waive these monitoring requirements following Public Notice and opportunity for hearing.

Attachment H

Standard Conditions

Definitions

Act means the Illinois Environmental Protection Act, 415 ILCS 5 as Amended.

Agency means the Illinois Environmental Protection Agency.

Board means the Illinois Pollution Control Board.

Clean Water Act (formerly referred to as the Federal Water Pollution Control Act) means

Pub. L 92-500, as amended. 33 U.S.C. 1251 et seq.

NPDES (National Pollutant Discharge Elimination System) means the national program for

issuing,. modifying, revoking and reissuing, terminating, monitoring and enforcing permits, and

imposing and enforcing pretreatment requirements, under Sections 307, 402, 318 end 405

of the Clean Water Act.

USEPA means the United States Environmental Protection Agency.

Dally Discharge means the discharge of a pollutant measured during a calendar-day or any

24-hour period that reasonably represents the calendar day for purposes of sampling. For

pollutants with limitations expressed in units of mass, the "daily discharge' is calculated as

the total mass of the pollutant discharged over the day. For pollutants with limitations

expressed in other units of measurements, the 'daily discharge' is calculated as the average

measurement of the pollutant over the day.

Maximum Daily Discharge Limitation (daily maximum) means the highest allowable daily

discharge.

Average Monthly Discharge Limitation (30 day average) means the highest allowable

average of daily discharges over a calendar month, calculated as the sum of all daily

discharges measured during a calendar month divided by the number of daily discharges

measured during that month.

Average Weekly Discharge Limitation (7 day average) means the highest allowable.

average of daily discharges over a calendar week, calculated as the sum of all daily

discharges measured during a calendar week divided by the number of daily discharges

measured during that week.

Best Management Practices (BMPs) means schedules of activities, prohibitions of practices,

maintenance procedures, and other management practices to prevent or reduce the pollution

of waters of the State. BMPs also include treatment requirements, operating procedures, and

practices to control plant site runoff, spillage or teaks, sludge or waste disposal, or drainage

from raw material storage.

Aliquot means a sample of specified volume used to make up a total composite sample.

Grab Sample means an individual sample of at least 100 milliliters collected at a randomly-

selected time over a period not exceeding 15 minutes.

24 Hour Composite Sample means a combination of at least 8 sample aliquots of at least

100 milliliters, collected at periodic intervals during the operating hours of a facility over a 24-

hour period.

8 Hour Composite Sample means a combination of at least 3 sample aliquots of at least 100

milliliters, collected at periodic intervals during the operating hours of a facility over an 8-hour

period.

Flow Proportional Composite Sample means a combination of sample aliquots of at least

100 milliliters collected at periodic intervals such that either the-time interval between each

aliquot or the volume of each aliquot is proportional to either the stream flow at the time of

sampling or the total stream flow since the collection of the previous aliquot.

(1)

Duty to comply. The permittee must comply with all conditions of this permit. Any

permit noncompliance constitutes a violation of the Act and is grounds for enforcement

action, permit termination, revocation and reissuance, modification, or for denial of a

permit renewal application. The permittee shall comply with effluent standards or

prohibitions established under Section 307(a) of the Clean Water Act for toxic

pollutants within the time provided in the regulations that establish these standards or

prohibitions, even if the permit has not yet been modified to incorporate the

requirement.

(2)

Duty to reapply. If the permittee wishes to continue an activity regulated by this permit

after the expiration date of this permit, the permittee must apply for and obtain a new

permit. If the permittee submits a proper application as required by the Agency no later

than 180 days prior to the expiration date, this permit shall continue in full force and

effect until the final Agency decision on the application has been made.

(3)

Need to halt or reduce activity not a defense. It shall not be a defense for a

permittee in an enforcement action that it would have been necessary to halt or reduce

the permitted activity in order to maintain compliance with the conditions of this permit.

(4)

Duty to mitigate. The permittee shall take all reasonable steps to minimize or prevent

any discharge in violation of this permit which has a reasonable likelihood of adversely

affecting human health or the environment.

(5)

Proper operation and maintenance. The permittee shall at all limes properly operate

and maintain all facilities and systems of treatment and control (and related

appurtenances) which are installed or used by the permittee to achieve compliance

with conditions of this permit. Proper operation and maintenance includes effective

performance, adequate funding, adequate operator staffing and training, and adequate

laboratory and process controls, including appropriate quality assurance procedures.

This provision requires the operation of back-up, or auxiliary facilities. or similar

systems only when necessary to achieve compliance with the conditions of the permit.

(6) Permit actions. This permit may be modified, revoked and reissued

or terminated

for cause by the Agency pursuant to 40 CFR 122.62. The filing of a request by the

permittee for a permit modification, revocation and reissuance, or termination

or a

notification of planned changes or anticipated noncompliance, does not slay day

permit condition.

(7)

?Property

rights. This permit does not convey any property rights of any sort. or any

exclusive privilege

(8) Duty to provide Information. The permit-tee shall furnish to the Agency within a

reasonable time. any information which the Agency may request to determine whether

cause exists for modifying, revoking and reissuing, or terminating this permit, or to

determine compliance with the permit. The permittee shall also furnish to the Agency.

upon request, copies of records required to be kept by this permit.

(9) Inspection and entry. The permittee shall allow an authorized representative of the

Agency, upon the presentation of credentials and other documents as may be required

by law, to:

(a)

Enter upon the permittee's premises where a regulated facility or activity is

located or conducted, or where records must be kept under the conditions of this

permit;

(b)

Have access to and copy, at reasonable times, any records that must be kept

under the conditions of this permit;

(c)

Inspect al reasonable times any facilities, equipment (including monitoring and

control equipment), practices, or operations regulated or required under this

permit; and

(d)

Sample or monitor at reasonable times, for the purpose of assuring permit

compliance, or as otherwise authorized by the Act, any substances or parameters

at any location.

(10) Monitoring and records.

(a)

Samples and measurements taken for the purpose of monitoring shall be

representative of the monitored activity.

(b)

The permittee shall retain records of all monitoring information, including all

calibration and maintenance records, and alt original strip chart recordings for

continuous monitoring Instrumentation, copies of all reports required by this

permit, and records of all data used to complete the application for this permit, for

a period of at least 3 years from the date of this permit, measurement, report or

application. This period may be extended by request of the Agency at any time

(c)

Records of monitoring information shall include:

The date, exact place, and time of sampling or measurements;

The individual(s) who performed the sampling or measurements;

The date(s) analyses were performed;

The individual(s) who performed the analyses;

The analytical techniques or methods used; and

The results of such analyses.

(d) Monitoring must be conducted according to test procedures approved under 40

CFR Part 136, unless other test procedures have been specified in this permit.

Where no test procedure under 40 CFR Part 136 has been approved, the

permittee must submit to the Agency a test method for approval. The permittee

shall calibrate and perform maintenance procedures on all monitoring and

analytical instrumentation at intervals to ensure accuracy of measurements.

(11) Signatory requirement All applications, reports or information submitted to the

Agency shall be signed and certified.

(a) Application. All permit applications shall be signed as follows:

(1) For a corporation: by a principal executive officer of at least the level of

vice president or a person or position having overall responsibility for

environmental matters for the corporation;

(2)

For a partnership or sole proprietorship: by a general partner or the

proprietor, respectively; or

(3)

For a municipality, State, Federal, or other public agency: by either a

principal executive officer or ranking elected official.

(b) Reports. All reports required by permits, or other information requestedby the

Agency shall be signed by a person described in paragraph (a) or by a duly

authorized representative of that person. A person is a duly authorized

representative only if:

(1)

The authorization is made in writing by a person described in paragraph (a);

and

(2)

The authorization specifies either an individual or a position responsible for

the overall operation of the facility, from which the discharge originates, such

as a plant manager, superintendent or person of equivalent responsibility;

and

(3)

The written authorization is submitted to the Agency.