Text

Revised NPDES Discharge Permit
	ML101310076
Person / Time
Site:	Callaway
Issue date:	05/07/2010
From:	Maglio S; AmerenUE
To:	; Document Control Desk, Office of Nuclear Reactor Regulation
References
	ULNRC-05703
	Download: ML101310076 (41)
	v • d • e

AmerenUE PO Box 620 Cal/away Plant Fulton, MO 65251 May 7,2010 ULNRC-05703 u.s. Nuclear Regulatory Commission Attn: Document Control Desk Washington, DC 20555-0001

~~ 10 CFR 51 wAmeren Ladies and Gentlemen:

UE DOCKET NUMBER 50-483 CALLAWAY PLANT UNIT 1 UNION ELECTRIC CO.

FACILITY OPERATING LICENSE NPF-30 REVISED NPDES DISCHARGE PERMIT In accordance with Callaway Plant Operating License NPF-30, Appendix B, Section 3.2, AmerenUE (Union Electric Company) hereby submits the enclosed revision of the National Pollutant Discharge Elimination System (NPDES) Discharge Permit for the Callaway plant. This revision is due to the Missouri Department of Natural Resources (DNR) issuing a minor permit modification on April 14, 2010 for acute and chronic Whole Eflluent Toxicity (WET) testing to acknowledge the periodic use of a new algaecide (BULAB 6060) at the Callaway plant and its potential discharge from NPDES Outfalls 002 and/or 016.

This letter does not contain new commitments.

Sincerely,

(J~A. r1\~

Scott A. Maglio Regulatory AtE .rs Manager BFHlnls Enclosure a subsidiary of Ameren Corporation

ULNRC May 7, 2010 Page 2 cc: Mr. Elmo E. Collins, Jr.

Regional Administrator U.S. Nuclear Regulatory Commission Region IV 612 E . Lamar Blvd., Suite 400 Arlington, TX 76011-4125 Senior Resident Inspector Callaway Resident Office U.S. Nuclear Regulatory Commission 8201 NRC Road Steedman, MO 65077 Mr. Mohan C. Thadani (2 copies)

Senior Project Manager, Callaway Plant Office of Nuclear Reactor Regulation U. S. Nuclear Regulatory Commission Mail Stop O-8G14 Washington, DC 20555-2738

ULNRC May 7, 2010 Page 3 Index and send hardcopy to QA File A160.0761 Hardcopy:

Certrec Corporation 4200 South Hulen, Suite 630 Fort Worth, TX 76109 (Certrec receives ALL attachments as long as they are non-safeguards and may be publicly disclosed.)

Electronic distribution for the following can be made via Responses and Reports ULNRC Distribution:

A. C. Heflin F. M. Diya L. S. Sandbothe C. O. Reasoner III S. M. Maglio T. B. Elwood S. L. Gallagher T. L. Woodward (NSRB)

Mr. Ron Reynolds, Director (SEMA)

Mr. Edward Gray, Senior REP Planner (SEMA)

Mr. John Campbell, REP Planner (SEMA)

Ms. Diane M. Hooper (WCNOC)

Mr. Dennis Buschbaum (Luminant Power)

Mr. Ron Barnes (APS)

Mr. Tom Baldwin (PG&E)

Mr. Wayne Harrison (STPNOC)

Mr. John O'Neill (Pillsbury Winthrop Shaw Pittman LLP)

Mr. Dru Buntin (DNR)

STATE OF MISSOURI DEPARTMENT OF NATURAL RESOURCES MISSOURI CLEAN WATER COMMISSION 8

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MISSOURI STATE OPERATING PERMIT In compliance with the Missouri Clean Water Law, (Chapter 644 R.S. Mo. as amended, hereinafter, the Law), and the Federal Water Pollution Control Act (Public Law 92-500, 92 nd Congress) as amended, Permit No. MO-0098001 Owner: Ameren VE Address: One Ameren Plaza, 1901 Chouteau Avenue, PO Box 66149, MC-602, St. Louis, MO 63166-6149 Continuing Authority: Same as above Address: Same as above Facility Name: Ameren VE, Callaway Power Plant Address: PO Box 620, Fulton, MO 65251 Legal

Description:

See page 2 Receiving Stream: See page 2 First Classified Stream and 10: See page 2 USGS Basin & Sub-watershed No.: See page 2 is authorized to discharge from the facility described herein, in accordance with the effluent limitations and monitoring requirements as set forth herein:

FACILITY DESCRIPTION The Callaway Power Plant combined discharge line has a cumulative daily average flow of 5.64 MGD and a daily maximum flow of 14.4 MGD.

See next page for individual outfall descriptions This permit authorizes only wastewater discharges under the Missouri Clean Water Law and the National Pollutant Discharge Elimination System; it does not apply to other regulated areas. This permit may be appealed in accordance with Section 644.051.6 of the Law.

February 13,2009 April 14,2010 14, 2010 ~4.,~~ -

Effective Date Revised Date Mark N. Templeton. Director. Department of Natural Resources February 12,2014 Expiration Date

Page 2 of21 Permit No. MO-009800 1 FACILITY DESCRIPTION Outfall #001 - Radwaste Treatment System - SIC #4911 (Piped to Missouri River)

This liquid radwaste system serves to collect, process, store, recycle and discharge treated waste water generated at Callaway. In addition, radioactive solids removed by this system are prepared for disposal and transported to a licensed off site disposal facility.

Five general sub-systems can be defined as described below.

The Boron Recycle System receives reactor coolant for the purpose of recovering the boric acid for reuse in the plant. Boric acid is used as a neutron absorber/moderator in the primary loop.

The Liquid Radwaste System collects and processes floor and equipment drains from the containment, auxiliary building, fuel building and radwaste buildings during normal operation.

The Laundry and Hot Shower system collects waste generated from washing radioactively contaminated protective gear and clothing and personnel decontamination shower wastewater. These wastes are then transferred to the liquid Radwaste system for treatment.

The Secondary Liquid Waste system is used to process condensate demineralizer regeneration wastes and potentially radioactive liquid waste collected from the turbine building. The condensate demineralizer regeneration waste is divided into two waste streams; High TDS waste from the acid and caustic rinses used when chemically regenerating spent resin, and low TDS waste which results from the initial backflushing of unregenerated resin and the final rinsing of the regenerated resin to remove acid and caustic.

Steam Generator Blowdown is normally recycled back to the main condenser for reuse in the secondary cycle. Provisions also exist to discharge the treated blowdown via #001.

The following wastewater treatment systems are used as required to treat this waste stream for recycle or discharge in compliance with NRC requirements and are also available as auxiliary or backup treatment systems to treat this discharge for compliance with NPDES permit limitations: Evaporation and/or Mixing and/or Filtration and/or Carbon Absorption and/or Ion Exchange and/or Neutralization and/or Reuse/Recycle of Treated Effluent. All processing in the Radwaste Treatment System is done on a batch basis except steam generator blowdown. After monitoring for radioactive content, release rates are controlled administratively to ensure the "as low as practicable" radioactive discharge criteria are met.

Daily average flow is 0.027 MGD.

Daily maximum flow is 0.298 MGD Legal

Description:

NE V4,Y4, NE V4, Y4, Sec. 14, T46N, R8W, Callaway LatitudelLongitude: +3845424/-09146462 Receiving Stream: Missouri River (P)

First Classified Stream and ID: Missouri River (P) (00701)

USGS Basin & Sub-watershed No.: (10300102-280004)

Outfall #002 - Cooling Tower Blowdown: (Piped to Missouri River)

Daily average flow is 4.84 MGD.

Daily maximum flow is 14.4 MGD.

This outfall consists of water from the Circulating Water System, the Service Water System, and the Essential Service Water (ESW)

System. Blowdown from the cooling tower is necessary to maintain the dissolved solids concentration in the recirculating water system within acceptable operating limits. The ESW System is not routinely used, however water from the ESW System does mix with the other systems as it is periodically run to demonstrate operability. Additionally, the ESW System can be used to maintain proper freeboard in the ultimate heat sink pond (see Outfall #017 description) by transferring water to the Service Water System.

Legal

Description:

NW V4, Y4, NW V4, Y4, Sec. 13, T46N, R8W, Callaway LatitudelLongitude: +3845459/-09146388 Receiving Stream: Missouri River (P)

First Classified Stream and ID: Missouri River (P) (00701)

USGS Basin & & Sub-watershed No.: (10300102-280004)

Page 3 of21 Permit No. MO-009800 MO-00980011 Outfall #003 - Water Treatment Plant Wastes (Piped to Missouri River)

Daily average flow is 0.0 MGD.

Daily maximum flow is 1.645 MGD.

(These flows represent wastewater discharged to the settling basin, actual discharge will vary depending on recycle.)Outfall recycle. )Outfall #003 consists of supernatant from a wastewater treatment lagoon that treats wastewater to remove solids. The wastewater that is treated in the lagoon is mainly from the blowdown of accumulated river solids in the water treatment plant clarifiers. The sand and carbon filter backwash, oil water separator and demineralizer system wastewater is also routed to this treatment lagoon. The oil water separator flow consists of wastewater from some plant sumps as well as flow from an oil recovery well that is being used to remediate a historic on-site release. Outfall #003 is normally recycled by routing it back to the head of the water treatment plant.

Legal

Description:

SW 14,V4, SW 14, V4, Sec. 13, T46N, R8W, Callaway LatitudelLongitude: +3845065/-09146409 Receiving Stream: Missouri River (P)

First Classified Stream and ID: Missouri River (P) (00701)

USGS Basin & Sub-watershed No.: (10300102-280004)

Outfall #004 - Demineralizer System Wastes This discharge is now included under Outfall #003.

Outfall #007 - 3 Cell Flow Through Lagoon (Piped to Missouri River)

Daily average flow is 0.0 MGD.

Daily Maximum flow is 0.040 MGD.

Design Population Equivalent is 400.

This outfall consists of a 3-celllagoon designed to receive only sanitary, on-site cafeteria, and laboratory waste from the plant. Sludge will be stored in the lagoon. The effluent will then be discharged to a constructed wetland. The monitoring location will be at the third treatment cell. Outfall #007 is normally recycled by routing it to the water treatment plant headworks.

Legal

Description:

SW 14,V4, SW 14, V4, Sec. 13, T46N, R8W, Callaway LatitudelLongitude: +3845123/-09146318

+3845123/-091463 18 Receiving Stream: Missouri River (P)

First Classified Stream and ID: Missouri River (P) (00701)

USGS Basin & Sub-watershed No.: (10300102-280004)

Outfall #009 - Intake Heater Blowdown: (Located right on Missouri River)

Daily average flow 0 MGD.

Daily maximum flow is 0.006 MGD.

The river intake structure contains two recirculating electric heaters which are used to prevent ice formation on the intake bar screens during the winter months. Outfall #009 consists of discharges from the infrequent blowdown or drainage of these boilers.

Legal

Description:

NW 14, V4, NW 14, V4, Sec. 5, T45N, R7W, Callaway LatitudelLongitude: +3842127/-09144185 Receiving Stream: Missouri River (P)

First Classified Stream and ID: Missouri River (P) (00701)

USGS Basin & Sub-watershed No.: (10300102-280004)

Outfalls #010, #011, #012, #014 and #015 - Storm Water Runoff Average rainfall event is 0.7 MGD.

Once in 10 year rainfall event is 38.5 MGD.

These five outfalls discharge storm water runoff from plant and associated areas after treatment in settling ponds. "Non-process" discharges that will be discharged to SWR include three intermittent sources. Two sources are the quarterly testing of the fire protection drains and the infrequent draining of the demineralized water storage tank. The third source is the pumping of manholes, transformer and tank containments at the plant. These outfalls will be under a Storm Water Pollution Prevention Plan for this permit cycle, so no actual monitoring will take place.

Page 4 of21 Permit No. MO-009800 1 Outfall #010:

Daily average flow is dependent on precipitation.

Maximum daily flow is 4.6 MGD Legal

Description:

SW V4, SW V4, Sec. 12, T46N, R8W, Callaway LatitudelLongitude: +3846088/-09146261 Receiving Stream: Unnamed Tributary to Logan Creek (U)

First Classified Stream and ID: Logan Creek (C) (00704)

USGS Basin & Sub-watershed No.: (10300102-280004)

Outfall #011:

Daily average flow is dependent on precipitation.

Daily Maximum flow is 19.7 MGD Legal

Description:

NW V4, SE V4, Sec. 12, T46N, R8W, Callaway LatitudelLongitude: +3846105/-09146002 Receiving Stream: Unnamed Tributary to Logan Creek (U)

First Classified Stream and ID: Logan Creek (C) (00704)

USGS Basin & Sub-watershed No.: (10300102-280004)

Outfall #012:

Daily average flow is dependent on precipitation.

Daily Maximum flow is 6.6 MGD Legal

Description:

NE V4, SE V4, Sec. 14, T46N, R8W, Callaway LatitudelLongitude: +3845168/-09146531 Receiving Stream: Tributary to Mud Creek (U)

First Classified Stream and ID: Logan Creek (C) (00704)

USGS Basin & & Sub-watershed No.: (10300102-280004)

Outfall #013: terminated Outfall #014:

Daily average flow is dependent on precipitation.

Daily Maximum flow is 4.8 MGD Legal

Description:

NW V4, SE V4, Sec. 11, T46N, R8W, Callaway LatitudelLongitude: +3846128/-09147052 Receiving Stream: Cow Branch (U)

First Classified Stream and ID: Cow Creek (C) (00707)

USGS Basin & & Sub-watershed No.: (10300102-280003)

Outfall #015:

Daily average flow is dependent on precipitation.

Daily Maximum flow is 2.8 MGD Legal

Description:

SE V4, NE V4, Sec. 11, T46N, R8W, Callaway Latitude/Longitude: +3846232/-09146506 Receiving Stream: Cow Branch (U)

First Classified Stream and ID: Cow Creek (C) (00707)

USGS Basin & Sub-watershed No.: (10300102-280003)

Outfall #016 - Cooling Tower Bypass (Piped to Missouri River)

Daily average flow is 0.777 MGD.

Daily Maximum flow is 14.4 MGD.

This outfall consists of clarified river water and wastewater that has been recycled through the water treatment plant. It is used to moderate flow through the water treatment plant and to provide carrier water in the discharge line when discharging from Outfall

001.

Legal

Description:

NW V4, NW V4, Sec. 13, T46N, R8W, Callaway LatitudelLongitude: +3845328/-09146408 Receiving Stream: Missouri River (P)

First Classified Stream and ID: Missouri (P) (00701)

USGS Basin & Sub-watershed No.: (10300102-280004)

Page 5 of21 Permit No. MO-009800 1 Outfall #017 - Ultimate Heat Sink Daily average flow is 0 MGD.

MOD.

Daily Maximum flow is 0 MGDMOD The Ultimate Heat Sink is a cooling pond that can provide cooling water to various plant systems during other than normal conditions.

Outfall #017 is the overflow from the Ultimate Heat Sink to local runoff. It is a no discharge outfall.

Legal

Description:

SE 114, ~, Sec. 14, T46N, R8W, Callaway V4, NE V4, LatitudelLongitude: +3845363/-09146441 Receiving Stream: Unnamed Tributary to Logan Creek (U)

First Classified Stream and ID: Logan Creek (C) (00704)

USGS Basin & Sub-watershed No.: (10300102-280004)

USOS This is a no-discharge outfall.

PAGE NUMBER 60f21 A. EFFLUENT LIMITATIONS AND MONITORING REQUIREMENTS PERMIT NUMBER MO-009800 1 The pennittee permittee is authorized to discharge from outfall(s) with serial number(s) as specified in the application for this permit.

pennit. The final effluent limitations shall become effective upon issuance and remain in effect until expiration of the permit.

penn it. Such discharges shall be controlled, limited and monitored by the permittee pennittee as specified below:

FINAL EFFLUENT LIMITATIONS MONITORING OUTFALL NUMBER AND EFFLUENT DAILY WEEKLY MONTHLY MEASUREMENT SAMPLE PARAMETER(S)

P ARAMETER(S) UNITS MAXIMUM AVERAGE AVERAGE FREQUENCY TYPE Outfall #001 - Radwaste System Flow MGD *

once/daily each batch each batch total Boron, Total Recoverable mg/L *

once/daily grab each batch Total Suspended Solids mg/L 45 30 once/daily grab each batch Oil and Grease mg/L 20 15 once/month grab Biochemical Oxygen Demands mg/L *

once/month grab pH - Units SU ** ** once/daily grab each batch Total Residual Chlorine mg/L 0.2 0.104 once/month grab Temperature C *

once/month grab MONITORING REPORTS SHALL BE SUBMITTED QUARTERLY; THE FIRST REPORT IS DUE April 28, 2009. THERE SHALL BE NO DISCHARGE OF FLOATING SOLIDS OR VISIBLE FOAM IN OTHER THAN TRACE AMOUNTS.

Acute Whole Effluent Toxicity (AWET) Test (Note 1) see special condition 12 MONITORING REPORTS SHALL BE SUBMITTED ONCE PER 5 YEARS; THE FIRST REPORT IS DUE January 28, 2010. THERE SHALL BE NO DISCHARGE OF FLOATING SOLIDS OR VISIBLE FOAM IN OTHER THAN TRACE AMOUNTS B. STANDARD CONDITIONS IN ADDITION TO SPECIFIED CONDITIONS STATED HEREIN, THIS PERMIT IS SUBJECT TO THE A TTACHED Parts I & III STANDARD CONDITIONS DATED October 1, 1980 and August 15, 1994, AND HEREBY INCORPORATED AS THOUGH FULLY SET FORTH HEREIN.

PAGE NUMBER 70f21 A. EFFLUENT LIMITATIONS AND MONITORING REQUIREMENTS PERMIT NUMBER MO-009800 1 permittee is authorized to discharge from outfall(s) with serial number(s) as specified in the application for this penn The pennittee it. The final permit.

effluent limitations shall become effective upon issuance and remain in effect until expiration of the pennit.

permit. Such discharges shall be controlled, limited and monitored by the pennittee permittee as specified below:

FINAL EFFLUENT LIMITATIONS MONITORING DAILY WEEKLY MONTHLY MEASUREMENT SAMPLE OUTFALL NUMBER AND EFFLUENT MAXIMUM AVERAGE AVERAGE FREQUENCY TYPE PARAMETER(S) UNITS TYPE Outfall #002 - Cooling Tower Blowdown Flow MGD *

once/day 24 hr. total Total Suspended Solids mg/L *

once/week grab Total Dissolved Solids mg/L *

once/week grab Oil and Grease mg/L 20 15 once/quarter* *

grab once/quarter***

Total Residual Chlorine mg/L 0.2 0.104 once/day grab pH- Units SU **** **** continuous 24 hr.

recorded Temperature C *

once/day grab MONITORING REPORTS SHALL BE SUBMITTED QUARTERLY; THE FIRST REPORT IS DUE April 28, 2009. THERE SHALL BE NO DISCHARGE OF FLOATING SOLIDS OR VISIBLE FOAM IN OTHER THAN TRACE AMOUNTS.

Acute Whole Effluent Toxicity (A WET) Test (Note 1) see special condition 12 MONITORING REPORTS SHALL BE SUBMITTED ANNUALLY; THE FIRST REPORT IS DUE January 28, 2010. THERE SHALL BE NO DISCHARGE OF FLOATING SOLIDS OR VISIBLE FOAM IN OTHER THAN TRACE AMOUNTS.

Chronic Whole Effluent Toxicity (CWET) Test (Note 1) see special condition 13 MONITORING REPORTS SHALL BE SUBMITTED ONCE/ 5 YEARS; THE FIRST REPORT IS DUE January 28, 2010. THERE SHALL BE NO DISCHARGE OF FLOATING SOLIDS OR VISIBLE FOAM IN OTHER THAN TRACE AMOUNTS.

B. STANDARD CONDITIONS IN ADDITION TO SPECIFIED CONDITIONS STATED HEREIN, THIS PERMIT IS SUBJECT TO THE ATTACHED Parts I & III STANDARD CONDITIONS DATED October 1, 1980 and August 15, 1994, AND HEREBY INCORPORATED AS THOUGH FULL Y SET FORTH HEREIN.

PAGE NUMBER 80f21 A. EFFLUENT LIMITATIONS AND MONITORING REQUIREMENTS PERMIT NUMBER MO-009800 1 permittee is authorized to discharge from outfall(s) with serial number(s) as specified in the application for this penn The pennittee permit.

it. The final effluent limitations shall become effective upon issuance and remain in effect until expiration of the permit.

penn it. Such discharges shall be controlled, limited and monitored by the permittee pennittee as specified below:

FINAL EFFLUENT LIMITATIONS MONITORING REOUIREMENTS OUTF ALL NUMBER AND DAILY WEEKLY MONTHLY MEASUREMENT SAMPLE EFFLUENT PARAMETER(S) UNITS MAXIMUM AVERAGE AVERAGE FREQUENCY TYPE Outfall #003 - Water Treatment Plant Flow MGD *

once/week 24 hr. total Total Suspended Solids mg/L mglL 100 30 once/month grab Oil and Grease mg/L 20 15 once/month grab Total Residual Chlorine mglL mg/L 0.2 0.104 once/month grab pH - Units SU ** ** once/month grab Outfall #004 - Demineralizer System (Now included under Outfall #003)

Outfall #007 - Sanitary Waste Flow MGD *

once/quarter* *

24 hr. estimate Biochemical Oxygen Demand 5 mg/L mglL 65 45 once/quarter***

once/quarter* *

grab Total Suspended Solids mg/L mglL 110 70 once/quarter* *

grab pH- Units SU ** ** once/quarter***

once/quarter* *

grab Ammonia as N mglL mg/L *

once/ quarter* *

once/quarter*** grab Fecal Coliform Colifonn cts/l00mL ctsllOOmL *

once/quarter***

once/quarter* *

grab Oil and Grease mg/L 15 10 once/quarter***

once/quarter* *

grab Outfall #009 - Intake Heater Blowdown Flow MGD *

once/week when 24 hr.

discharge occurs total Total Suspended Solids mglL mg/L 100 30 once/week when grab discharge occurs Oil and Grease mglL mg/L 20 15 once/week when grab discharge occurs once/week when grab pH - Units SU ** ** dischar~e occurs MONITORING REPORTS SHALL BE SUBMITTED QUARTERLY; THE FIRST REPORT IS DUE A~ril282 2009.

B. STANDARD CONDITIONS IN ADDITION TO SPECIFIED CONDITIONS STATED HEREIN, THIS PERMIT IS SUBJECT TO THE ATTACHED Parts I & III STANDARD CONDITIONS DATED October L 1980 and August 15 2 1994, AND HEREBY INCORPORATED AS THOUGH FULL FULLY Y SET FORTH HEREIN.

PAGE NUMBER 90f21 A. EFFLUENT LIMITATIONS AND MONITORING REQUIREMENTS PERMIT NUMBER MO-009800 1 The permittee is authorized to discharge from outfall(s) with serial number(s) as specified in the application for this permit. The final effluent limitations shall become effective upon issuance and remain in effect until expiration of the permit. Such discharges shall be controlled, limited and monitored by the permittee as specified below:

FINAL EFFLUENT LIMITATIONS MONITORING REQUIREMENTS OUTF OUTFALLALL NUMBER AND EFFLUENT DAILY WEEKLY MONTHLY MEASUREMENT SAMPLE PARAMETER(S) UNITS MAXIMUM AVERAGE AVERAGE FREQUENCY TYPE Outfalls#O 1O~ #0 11 ~ #0 12~ #014 and #015 - Storm Water Runoff2 and #017 ultimate heat sink note 2 See special condition # 9 MONITORING REPORTS SHALL NOT BE SUBMITTED. THERE SHALL BE NO DISCHARGE OF FLOATING SOLIDS OR VISIBLE FOAM IN OTHER THAN TRACE AMOUNTS Outfall #016 Cooling tower bXQass Flow MGD *

once/quarter***

once/quarter* *

24 hr.

estimate Total Suspended Solids mg/L 100 30 once/quarter*** grab Oil and Grease mg/L 20 15 once/quarter*** grab Total Residual Chlorine mg/L 0.2 0.104 once/quarter*** grab pH- Units SU ** **

once/quarter* *

grab Temperature C *

once/quarter* *

grab MONITORING REPORTS SHALL BE SUBMITTED QUARTERLY; THE FIRST REPORT IS DUE AQril28 2 2009. THERE SHALL BE NO DISCHARGE OF FLOATING SOLIDS OR VISIBLE FOAM IN OTHER THAN TRACE AMOUNTS.

Acute Whole Effluent Toxicity (A WET) Test (Note 1) see special condition 12 MONITORING REPORTS SHALL BE SUBMITTED ANNUALLY; THE FIRST REPORT IS DUE January 28, 2010. THERE SHALL BE NO DISCHARGE OF FLOATING SOLIDS OR VISIBLE FOAM IN OTHER THAN TRACE AMOUNTS.

IN ADDITION TO SPECIFIED CONDITIONS STATED HEREIN, THIS PERMIT IS SUBJECT TO THE ATTACHED Parts I & III STANDARD CONDITIONS DATED October 1. 1980 and August 15, 15,1994, 1994, AND HEREBY INCORPORATED AS THOUGH FULLY SET FORTH HEREIN.

A. EFFLUENT LIMITATIONS AND MONITORING REQUIREMENTS (continued)

Monitoring requirement only.

- pH is measured in pH units and is not to be averaged. The pH is limited to the range of6.0-9.0 pH units.

- - Sample once per quarter in the months of February, May, August, and November.

- - - Permittee shall maintain the pH between 6.0 - 9.0 except excursions from the range are permitted subject to the following limitations:

1. The total time during which the pH values are outside the required range of pH values shall not exceed 7 hours8.101852e-5 days 0.00194 hours 1.157407e-5 weeks 2.6635e-6 months and 26 minutes in any calendar month; and

2. No individual excursion from the range of pH values shall exceed 60 minutes.

Monitoring reports shall show each excursion, the duration of the excursion, and the total excursion time for each month.

Should the continuous monitor fail for any reason, daily grab samples shall be provided until repairs are completed.

- - - - Discharge shall not cause temperature of the mixing zone to increase by more than 5 OF

Page 10 of21 Permit No. MO-009800 1 Note 1 - WET Test must coincide with resumption of discharge after application of the treatment's molluscicide and algaecide.

Sample taken for WET Test should be representative of a molluscicide and algaecide dosing event. If treatments are not used by December, use December as the sampling month.

Note 2-- Outfall #017 - Ultimate Heat Sink There shall be no discharge of wastewater from this outfall to waters of the state of Missouri.

Note 3 -- The average of the temperature of outfall #002 will be used as the river discharge temperature for 316 (a) calculations.

C. SPECIAL CONDITIONS

1. In issuing this permit, the Missouri Clean Water Commission and the Missouri Department of Natural Resources has not determined whether or not the radioactive discharges from this plant will affect waters of the state. Radioactive discharges are the responsibility of the Nuclear Regulatory Commission, and any discharges of these constituents will be under their regulation.

2. Discharge Limitations - There shall be no discharge of polychlorinated biphenyl compounds.

3. Pesticides Any pesticide discharge from any point source shall comply with the requirements of the Federal Insecticide, Fungicide, and Rodenticide Act, as amended (7W.S.C. 136 et. seq.) and the use of such pesticides shall be in a manner consistent with its label.

4. This permit may be reopened and modified, or alternatively revoked and reissued, to:

(a) Comply with any applicable effluent standard or limitation issued or approved under Sections 301 (b)(2)(C) and (D),

301(b)(2)(C) 304(b)(2), and 307(a) (2) of the Clean Water Act, if the effluent standard or limitation so issued or approved:

(1) contains different conditions or is otherwise more stringent than any effluent limitation in the permit; or (2) controls any pollutant not limited in the permit.

(b) Incorporate new or modified effluent limitations or other conditions, if the result of a waste load allocation study, toxicity test or other information indicates changes are necessary to assure compliance with Missouri's Water Quality Standards.

(c) Incorporate new or modified effluent limitations or other conditions if, as the result of a watershed analysis, a Total Maximum Daily Load (TMDL) limitation is developed for the receiving waters which are currently included in Missouri's list of waters of the state not fully achieving the state's water quality standards, also called the 303(d) list.

( d)

(d) Incorporate any items or limitations concerning section 316 ((a) a) and 316(b) of the Clean Water Act.

The permit as modified or reissued under this paragraph shall also contain any other requirements of the Clean Water Act then applicable.

5. The permittee shall conduct the following radiological monitoring:

a. Liquid Radwaste discharge, surface water and drinking water supply:

LOCATION FREQUENCY SAMPLE TYPE I. Radwaste building discharge a) Batch Releases prior to each batch a representative grab sample of each batch discharge b) Steam Generator once per day a representative Blowdown when discharging grab sample II. Upstream of discharge line once/month grab III. Downstream of discharge daily with composite line at Portland, MO monthly composite analysis

Page 11 of21 Permit No. MO-009800 1 Samples of Batch Releases are to be analyzed for tritium, 1-131, and gamma isotopic for each batch; and for Sr-89, Sr-90, and Fe-55 in a quarterly composite of each batch.

Samples of Steam Generator Blowdown are to be analyzed for tritium, 1-131, and gamma isotopic in daily samples; and for Sr-89, Sr-90, and Fe-55 in a quarterly composite of daily samples.

Samples of Surface Water are to be analyzed for tritium and gamma isotopic in monthly samples.

b. Aquatic biota - semiannual sampling of the edible flesh of up to five commercially or recreationally important species of fish of sufficient quantity to yield a sufficient sample. Samples are to be taken at the locations specified in II and III.

Samples are to be analyzed by gamma isotopic analysis. Catfish need not be included in sample.

c. Bottom Sediment - semiannual samples of bottom sediment from the locations specified in II and III. Samples are to be analyzed by gamma isotopic analysis.

d. Results of the above monitoring programs shall be reported to the Department by supplying a copy of the Annual Radiological Environmental Operating Report per Technical Specification 5.6.2 and the Annual Radioactive Effluent Release Report per Technical Specification 5.6.3 at the same time they are supplied to NRC. All data information shall be available for inspection during normal working hours.

e. The Department of Natural Resources of the State of Missouri, and any other state agency or officer designated in the State's emergency response plan or any other plan to protect its citizens from radioactive liquid discharge from the Callaway Plant, shall receive within one hour of the event, notice of any unplanned or uncontrolled liquid radioactive release in accordance with 10 CFR 50.72(a) and notification of reportable events per 10 CFR 20.2203 that involve off-site releases of liquid radioactive material.

6. Changes in Discharges of Toxic Substances The permittee shall notify the Director as soon as it knows or has reason to believe:

(a) That any activity has occurred or will occur which would result in the discharge of any toxic pollutant which is not limited in the permit, if that discharge will exceed the highest of the following "notification levels:"

(1) One hundred micrograms per liter (1 00 ~g!L);

(2) Two hundred micrograms per liter (200 ~g!L) for acrolein and acrylonitrile; five hundred micrograms per liter (500 ~glL) for 2,5 dinitrophenol and for 2-methyl-4, 6-dinitrophenol; and one milligram per liter (1 mglL) for antimony; (3) Five (5) times the maximum concentration value reported for the pollutant in the permit application; (4) The level established in Part A of the permit by the Director.

(b) That they have begun or expect to begin to use or manufacture as an intermediate or final product or byproduct any toxic pollutant, which was not reported in the permit application.

7. Permittee is exempt from section 311 and superfund reporting under 40 CFR 117.12 (a) 1-3 for the following chemicals:

Ammonium Hydroxide, Ethylene Glycol, Hydrazine, Sodium Hydroxide, Sodium Hypochlorite, Sulfuric Acid, and Phosphoric Acid.

8. The 316 (b) study was done in 1984 and 1986. Since there have been no changes to the intake structure, the study is approved for this permit cycle.

9. The company has elected to use Best Management Practices on Storm water outfalls. Monitoring is waived for this permit cycle. IfIfproblems problems occur, monitoring will be re-established by the department. Periodic inspection of these outfalls will be carried out by the permittee to ascertain that BMPs are working. The permittee will create and implement a Storm Water Pollution Prevention Plan that outlines the BMPs to be used. This will be kept at the site and must be made available to inspectors upon request.

10. The Permittee has submitted a letter dated May 30,2008 30, 2008 stating that none of the chemicals listed at 40 CFR 423 Appendix A as required at 40 CFR 423 .13 (d)(l)

(d)(1) are used. This submittal is allowed at 40 CFR 423.13 (d) (3) and was submitted prior to the issuance ofofthis this permit. It is a part of the permit file for this facility.

11. Reserved for heat issues.

Page 12 of21 Permit Penn MO-009800 1 it No. MO-0098001

12. Acute Whole Effluent Toxicity (WET) tests will be conducted as follows:

SUMMARY

OF ACUTE WET TESTING FOR THIS PERMIT OUTFALL AEC LC50%* FREQUENCY SAMPLE TYPE MONTH 10%, unless Once/ 5 years when Any, diffusers in 24 hr. composite 001 33.3% molluscicide is used Report by 1-28-2010 place Any month treatments Annually, when are applied--report in lO%, unless 10%,

treatment's January. Ifno diffusers in 24 hr. composite 002 33.3% molluscicide and treatment by place algaecide are used in I>ecember, test in same month. I>ecember 10%, unless diffusers in 24 hr. composite 016 33.3% Same as #002 Same as #002 place

LC50 = AEC //0.3.

0.3.

I>ilution Series 100% 50% 25% 12.5% I 6.25%

(Control) 100% upstream, if I (Control) 100% Lab Water, I I I I available also called synthetic water (a) Test Schedule and Follow-Up Requirements (1) Perform a MULTIPLE-dilution acute WET test in the months and at the frequency specified above. For tests Perfonn which are successfully passed, submit test results using the I>epartment's WET test report form fonn #MO-780-1899 along with complete copies of the test reports as received from the laboratory, including copies of chain-of-forms within 30 calendar days of availability to the WATER PROTECTION PROGRAM, P.O. Box 176, custody fonns Jefferson City, MO 65102. If the effluent passes the test, do not repeat the test until the next test period.

(a) For discharges of stonnwater, stormwater, samples shall be collected within three hours from when discharge first occurs.

(b) Samples submitted for analysis of stonnwater stormwater discharges shall be collected as a grab.

(c) For discharges of non-storm water, samples shall be collected only when precipitation has not occurred for a ofnon-stonnwater, period of forty-eight hours prior to sample collection. In no event shall sample collection occur simultaneously with the occurrence of precipitation excepting for stonnwater stormwater samples.

(d) A twenty-four hour composite sample shall be submitted for analysis of non-storm water discharges.

(e) Upstream receiving water samples, where required, shall be collected upstream from any influence of the effluent where downstream flow is clearly evident.

(t) Samples submitted for analysis of upstream receiving water may be collected as either a grab or twenty-four-hour composite as appropriate to the nature of the discharge.

(g) Chemical and physical analysis of the upstream control and effluent sample shall occur immediately upon being received by the laboratory, prior to any manipulation of the effluent sample beyond preservation methods consistent with federal guidelines for WET testing that are required to stabilize the sample during shipping.

(h) Any and all chemical or physical analysis of the effluent sample perfonned performed in conjunction with the WET performed at the 100% Effluent concentration in addition to analyses performed upon any test shall be perfonned other effluent concentration.

(i) All chemical analyses included in the Missouri I>epartment of Natural Resources WET test report fonn form performed and results shall be recorded in the appropriate field of the report fonn.

MO-780-1899 shall be perfonned form.

U) Where flow-weighted composite sample is required for analysis, the samples shall be composited at the laboratory where the test is to be performed.

perfonned.

(k) Where in stream testing is required downstream from the discharge, sample collection shall occur immediately below the established Zone of Initial I>ilution in conjunction with or immediately following a release or discharge.

Page 13 of21 Permit No. MO-009800 1 (I)

(1) Samples submitted for analysis of downstream receiving water may be collected as either a grab or twenty-four-hour composite as appropriate to the nature of the discharge.

(m) All instream samples, including downstream samples, shall be tested for toxicity at the 100% concentration in addition to any other assigned AEC for in-stream samples.

(2) All failing test results along with complete copies of the test reports as received from the laboratory, INCLUDING THOSE TESTS CONDUCTED UNDER CONDITION (3) BELOW, shall be reported to the WATER PROTECTION PROGRAM, P.O. Box 176, Jefferson City, MO 65102 within 14 calendar days of the availability of the results.

(3) If the effluent fails the test, a multiple dilution test shall be performed for BOTH test species within 30 calendar days and biweekly thereafter (for storm water, tests shall be performed on the next and subsequent storm water discharges as they occur, but not less than 7 days apart) until one of the following conditions are met:

(a) THREE CONSECUTIVE MULTIPLE-DILUTION TESTS PASS. No further tests need to be performed until next regularly scheduled test period.

(b) A TOTAL OF THREE MULTIPLE-DILUTION TESTS FAIL.

(4) Failure of at WET tests is a violation of this permit.

(5) The permittee shall submit a summary of all test results for the test series along with complete copies of the test reports as received from the laboratory to the WATER PROTECTION PROGRAM, P.O. Box 176, Jefferson City, MO 65102 within 14 calendar days of the third failed test.

(6) Additionally, the following shall apply upon failure of the third MULTIPLE DILUTION test: A toxicity identification evaluation (TIE) or toxicity reduction evaluation (TRE) is automatically triggered. The permittee shall contact THE WATER PROTECTION PROGRAM within 14 calendar days from availability of the test results to ascertain as to whether a TIE or TRE is appropriate. The permittee shall submit a plan for conducting a TIE or TRE to the WATER PROTECTION PROGRAM within 60 calendar days of the date ofDNR's direction to perform either a TIE or TRE. This plan must be approved by DNR before the TIE or TRE is begun. A schedule for completing the TIE or TRE shall be established in the plan approval.

(7) Upon DNR's approval, the TIE/TRE schedule may be modified if toxicity is intermittent during the TIE/TRE investigations. A revised WET test schedule may be established by DNR for this period.

(8) If a previously completed TIE has clearly identified the cause of toxicity, additional TIEs will not be required as Ifa long as effluent characteristics remain essentially unchanged and the permittee is proceeding according to a DNR approved schedule to complete a TRE and reduce toxicity. Regularly scheduled WET testing as required in the permit, without the follow-up requirements, will be required during this period.

(9) Submit a concise summary in tabular format of all WET test results with the annual report.

(b) PASSIF AIL procedure and effluent limitations:

(1) To pass a multiple-dilution test:

(a) For facilities with a computed percent effluent at the edge of the zone of initial dilution, Allowable Effluent Concentration (AEC) OF 30% OR LESS, the AEC must be less than three-tenths (0.3) of the LC so concentration for the most sensitive of the test organisms; OR, (b) For facilities with an AEC greater than 30%, the LC50 concentration must be greater than 100%; AND, (c) All effluent concentrations equal to or less than the AEC must be nontoxic. Mortality observed in all effluent concentrations equal to or less than the AEC shall not be significantly different (at the 95%

confidence level; p = 0.05) than that observed in the upstream receiving-water control sample. Where upstream receiving water is not available mortality observed in the AEC test concentration shall not be significantly different (at the 95% confidence level; p = 0.05) than that observed in the laboratory control.

The appropriate statistical tests of significance shall be consistent with the most current edition of METHODS FOR MEASURING THE ACUTE TOXICITY OF EFFLUENTS AND RECEIVING WATERS TO FRESHWATER AND MARINE ORGANISMS or other federal guidelines as appropriate or required. Failure of one multiple-dilution test may be considered an effluent limit violation.

Page 14 of21 Permit No. MO-009800 1I (c) Test Conditions (1) Test Type: Acute Static non-renewal (2) All tests, including repeat tests for previous failures, shall include both test species listed below.

(3) Test species: Ceriodaphnia dubia and Pimephales promelas (fathead minnow). Organisms used in WET testing shall come from cultures reared for the purpose of conducting toxicity tests and cultured in a manner consistent with the most current USEPA USEP A guidelines. All test animals shall be cultured as described in the most current edition of Methods for Measuring the Acute Toxicitv of Effluents and Receiving Waters to Freshwater and Marine Organisms.

(4) Test period: 48 hours5.555556e-4 days 0.0133 hours 7.936508e-5 weeks 1.8264e-5 months at the "Acceptable Effluent Concentration" (AEC) specified above.

(5) Upstream receiving stream water shall be used as dilution water. If upstream water is unavailable or if mortality in the upstream water exceeds 10%, "reconstituted" water will be used as dilution water. Procedures for generating reconstituted water will be supplied by the MDNR upon request.

(6) Multiple-dilution tests will be run with:

(a) 100%,50%,25%, 12.5%, and 6.25% effluent, unless the AEC is less than 25% effluent, in which case dilutions will be 4 times the AEC, two times the AEC, AEC, 1/2 112 AEC and 1/4 114 AEC; (b) 100% receiving-stream water (if available), collected upstream of the outfall at a point beyond any influence of the effluent; and (c) Reconstituted water.

(7) If reconstituted-water control mortality for a test species exceeds 10%, the entire test will be rerun.

(8) Ifupstream control mortality exceeds 10%, the entire test will be rerun using reconstituted water as the dilutant.

Page 15 of21 Permit No. MO-009800 1

SUMMARY

OF TEST METHODOLOGY FOR WHOLE-EFFLUENT TOXICITY TESTS Whole-effluent-toxicity test required in NPDES permits shall shaH use the following foHowing test conditions when performing single or multiple dilution methods. Any future changes in methodology will be supplied to the permittee by the Missouri Department of Natural Resources (MDNR). Unless more stringent methods are specified by the DNR, the procedures shall shaH be consistent with the most current edition of Methods for Measuring the Acute Toxicity of Effluents and Receiving Waters to Freshwater and Marine Organisms, Test conditions for eeriodaphnia dubia:

Test duration: 48 h Temperature: 25 +/- l°e Temperatures shall not deviate by more than 3°e during the test.

Light Quality: Ambient laboratory illumination Photoperiod: 16 h light, 8 h dark Size of test vessel: 30 mL (minimum)

Volume of test solution: 15 mL (minimum)

Age of test organisms: <24 hold No. of animals/test vessel: 5 No. of replicates/concentration: 4 No. of organisms/concentration: 20 (minimum)

Feeding regime: None (feed prior to test)

Aeration: None Dilution water: Upstream receiving water; if no upstream flow, synthetic water modified to reflect effluent hardness.

Endpoint: PasslFail (Statistically significant Mortality when compared to upstream receiving water control or synthetic control if upstream water was not available at p,:S p'::: 0.05)

Test acceptability criterion: 90% or greater survival in controls Test conditions for (Pimephales promelas):

Test duration: 48 h Temperature: 25 +/- l°e Temperatures shall not deviate by more than 3°e during the test.

Light Quality: Ambient laboratory illumination Photoperiod: 16 h light! 8 h dark Size of test vessel: 250 mL (minimum)

Volume of test solution: 200 mL (minimum)

Age of test organisms: 1-14 days (all same age)

No. of animals/test vessel: 10 No. of replicates/concentration: 4 (minimum) single dilution method 2 (minimum) multiple dilution method No. of organisms/concentration: 40 (minimum) single dilution method 20 (minimum) multiple dilution method Feeding regime: None (feed prior to test)

Aeration: None, unless DO concentration falls below 4.0 mg/L;mgIL; rate should not exceed 100 bubbles/min.

Dilution water: Upstream receiving water; if no upstream flow, synthetic water modified to reflect effluent hardness.

Endpoint: PasslFail (Statistically significant Mortality when compared to upstream receiving water control or synthetic control if upstream water was not available at p,:S p'::: 0.05)

Test Acceptability criterion: 90% or greater survival in controls

Page 16 of21 Permit No. MO-0098001

13. Chronic Whole Effluent Toxicity (CWET) Tests shall be conducted as follows:

SUMMARY

OF CHRONIC WET TESTING FOR THIS PERMIT CHRONIC EFFLUENT CRITICAL DILUTION DILUTION FREQUENCY SAMPLE MONTH OUTFALL SERIES (CCD) % ** (one dilution must be CCD) TYPE

002 10% by default unless 40, 40,20,10,5,2.5 20,10,5, 2.5 % Once per 5 24 hr Any, month diffusers in place years, when hears, composite treatment are reatment's treatment's ~p~lied--report molluscicide In anuary and algaecide 2010. Ifno are used in treatments by same month December, test in December If the CCD is 25% or less dilutions will be 4 times the CCD, two times the CCD, CCD, 112 CCD and 114 CCD. No CCD can be less than 10% unless an approved diffuser is in place.

Test Parameter to be reported Pass/Fail Survival [TLP3B]+

No Observable Effect Concentration (lethal) on Survival [TOP3B]+

Lowest Observable Effect Concentration (lethal) on Survival [TXP3B]+

Ceriodaphnia dubia, 7- % Mortality at Critical Dilution [TJP3B]+

day chronic NOEC PasslFail Reproduction [TGP3B]+

static renewal, No Observable Effect Concentration freshwater (sublethal) on Reproduction [TPP3B]+

Lowest Observable Effect Concentration (sublethal) on Reproduction

[TYP3B]+

Highest % Coefficient ofVariation*

[TQP3B]+

Pass/Fail Survival [TLP6C]+

No Observable Effect Concentration (lethal) on Survival [TOP6C] +

Lowest Observable Effect Concentration Pimephales promelas (lethal) on Survival [TXP6C] +

(Fathead minnow), 7- % Mortality at Critical Dilution [TJP6C]+

day chronic NOEC PasslFail Growth [TGP6C]+

static renewal, No Observable Effect Concentration freshwater (sublethal) on Growth [TPP6C] +

Lowest Observable Effect Concentration (sublethal) on Growth [TYP6C]+

Highest % Coefficient of Variation **

[TQP6C] +

for the Chronic Critical Dilution or Control + items in brackets are for WPP use only

- CCD= (design flow of outfall in cfs) / ((7QIO*0.25)

((7QlO*0.25) + design flow of outfall in cfs>>, but not less than 10% unless diffuser in place.

Page 17 of21 Permit No. MO-0098001 MO-009800 1 (a) Chronic WET Test Schedule and Follow-Up Requirements (1) Perform a CHRONIC MULTIPLE-dilution test in the months and at the frequency specified above. For tests which are successfully passed, submit test with complete copies of the test reports as received from the laboratory, including copies of chain-of-custody forms within 30 calendar days of availability to the WATER PROTECTION PROGRAM, P.O. Box 176, Jefferson City, MO 65102. If the effluent passes the chronic test, do not repeat the test until the next test period.

(a) A twenty-four hour composite sample shall be submitted for analysis of non-storm water discharges.

(b) Upstream receiving water samples shall be collected upstream from any influence of the effluent discharge.

(c) Samples submitted for analysis of upstream receiving water may be collected as a grab.

(d) Chemical and physical analysis of the upstream control and effluent sample shall occur immediately upon being received by the laboratory, prior to any manipulation of the effiuent effluent sample beyond preservation methods consistent with federal guidelines for WET testing that are required to stabilize the sample during shipping.

(e) Any and all chemical or physical analysis of the effiuent effluent sample performed in conjunction with the chronic WET test shall be performed at the CCD effluent concentration and the 100% effluent concentration.

(f) (reserved)

(g) Where flow-weighted composite sample is required for analysis, the samples shall be composited at the laboratory where the test is to be performed.

(h) Where in stream testing is required downstream from the discharge, sample collection shall occur immediately below the established Zone ofInitial Dilution in conjunction with or immediately following a release or discharge.

(i) Samples submitted for analysis of downstream receiving water may be collected as a twenty-four-hour composite.

U) All instream samples, including downstream samples, shall be tested for toxicity at the 100% concentration in addition to any other assigned CCD for in-stream samples.

(k) If the upstream water is unsatisfactory as a result of in stream toxicity, the permittee must submit the test results exhibiting receiving water toxicity with the full test report and may thereafter substitute synthetic dilution water for the receiving water in all subsequent tests.

(2) All failing test results along with complete copies of the test reports as received from the laboratory, INCLUDING THOSE TESTS CONDUCTED UNDER CONDITION (3) BELOW, shall be reported to the WATER PROTECTION PROGRAM, P.O. Box 176, Jefferson City, MO 65102 within 14 calendar days of the availability of the results.

(3) If the effluent fails the test, another multiple dilution test shall be performed within 30 calendar days and biweekly thereafter, until one of the following conditions are met:

(a) TWO CONSECUTIVE MULTIPLE-DILUTION TESTS PASS. No further tests need to be performed until next regularly scheduled test period.

(b) A TOTAL OF THREE MULTIPLE-DILUTION TESTS FAIL.

(9) Failure of at least two multiple-dilution tests during any period of accelerated monitoring violates the permit and the narrative requirement for aquatic life protection.

(10) The permittee shall submit a summary of all chronic test results for the test series along with complete copies of the test reports as received from the laboratory to the WATER PROTECTION PROGRAM, P.O. Box 176, Jefferson City, MO 65102 within 14 calendar days of the second failed test.

(II)

(11) Additionally, the following shall apply upon failure of the third MULTIPLE DILUTION test: A chronic toxicity identification evaluation (TIE) or chronic toxicity reduction evaluation (TRE) is automatically triggered. The permittee shall contact THE WATER PROTECTION PROGRAM within 14 calendar days from availability of the test results to ascertain as to whether a chronic TIE or chronic TRE is appropriate. The permittee shall submit a plan for conducting a chronic TIE or TRE to the WATER PROTECTION PROGRAM within 60 calendar days of the date ofDNR's direction to perform either a chronic TIE or TRE. This plan must be approved by DNR before the chronic TIE or TRE is begun. A schedule for completing the chronic TIE or TRE shall be established in the plan approval.

(12) Upon DNR's approval, the chronic TIE/TRE schedule may be modified if toxicity is intermittent during the chronic TIE/TRE investigations. A revised WET test schedule may be established by DNR for this period.

(13) Ifa previously completed chronic TIE has clearly identified the cause of toxicity, additional chronic TIEs may not be required as long as effluent effiuent characteristics remain essentially unchanged and the permittee is proceeding according to a DNR approved schedule to complete a chronic TRE and reduce toxicity. The time period for completing a TRE shall not exceed 28 months.

Page 18 of21 Permit No. MO-0098001 MO-009800 1 (14) During the period that a TRE is being conducted, quarterly chronic WET testing will be required (without the follow-up requirements) even if the permit calls for yearly testing only.

(10) When WET test sampling is required to run over one DMR period, each DMR report shall contain a copy of the Department's WET test report form that was generated during the reporting period.

(11) Submit a concise summary in tabular format of all WET test results with the annual report.

(b) Test Conditions (9) Test Type: Chronic Static renewal (10) All tests, including repeat tests for previous failures, shall include both test species listed below.

(11) Test species: Ceriodaphnia dubia and Pimephales promelas (fathead minnow). Organisms used in WET testing shall come from cultures reared for the purpose of conducting toxicity tests and cultured in a manner consistent with the most current USEP A guidelines. All test animals shall be cultured as described in the most current edition of Short Term Methods for Measuring the Chronic Toxicity of Effluents and Receiving Waters to Freshwater Organisms.

(12) Upstream receiving stream water shall be used as dilution water. Ifupstream water is unavailable or if mortality in the upstream water exceeds 20%, "reconstituted" water will be used as dilution water. Procedures for generating constituted water will be supplied by the MDNR upon request.

(13) Multiple-dilution tests will be run with the dilution series indicated at the beginning of this special condition and 100% receiving-stream water (if available), collected upstream of the outfall at a point beyond any influence of the effluent.

(14) If reconstituted-water control mortality for a test species exceeds 20%, the entire test will be rerun.

Ifreconstituted-water (15) Ifupstream control mortality exceeds 20%, the entire test will be rerun using reconstituted water as the dilutant.

(16) See the attachment to the permit entitled "Summary of Test Conditions and Methods for Chronic Whole Effluent Toxicty Tests" for more test conditions.

(c) Methodology (1) Ceriodaphnia dubia chronic static renewal 7-day survival and reproduction test, Method 1002.0, EPA-821-R 013 (October 2002. A minimum often (10) replicates with one (1) organism per test chamber, must be used in the control and in each of the 5 effluent dilutions of this test. One of the effluent dilutions must be the critical dilution as specified in the permit special conditions. This test should be terminated when 60% of the surviving females in the control produce three broods or at the end of eight days, whichever comes first. If these criteria are not met at the end of 7 days, the test must be repeated.

(2) Pimephales promelas (Fathead minnow) chronic static renewal 7-day larval survival and growth test, Method 1000.0, EPA-82I-R-02-013 EPA-821-R-02-013 (October 2002). A minimum of five (5) replicates with ten (10) organisms per replicate must be used in the control and in each of the 5 effluent dilutions of this test. One of the effluent dilutions must be the critical dilution as specified in the permit special conditions. This test should be terminated at the end of 7 days.

(3) The NOEC L (No Observed Lethal Effect Concentration) is defined as the greatest effluent dilution at and below which lethality that is statistically different from the control (0% effluent) at the 95% confidence level does not occur. Chronic lethal test failure (chronic NOEC L test) is defined as a demonstration of a statistically significant lethal effect at test completion to a test species at or below the critical dilution.

(4) The NOEC s (No Observed Sublethal Effect Concentration) is defined as the greatest effluent dilution at and below which sub lethality (inhibited reproduction in the Ceriodaphnia dubia test or inhibited growth in the Fathead minnow test) that is statistically different from the control (0% effluent) at the 95% confidence level does not occur. Chronic sublethal test failure (chronic NOECS test) is defined as a demonstration ofa of a statistically significant sublethal effect at test completion to a test species at or below the critical dilution.

(d) Test acceptance (1) The permittee shall repeat a test, including the control and all effluent dilutions, if the procedures and quality assurance requirements defined in the test methods or in this permit are not satisfied, including the following additional criteria:

(2) The toxicity test control (0% effluent) must have survival equal to or greater than 80%.

Page 19 of21 Permit No. MO-009800 1

. (3) The mean number of Ceriodaphnia dubia neonates produced per surviving female in the control (0% effluent) must be 15 or more.

(4) Sixty (60) percent or more of the surviving Ceriodaphnia dubia control females must produce three broods.

(5) The mean dry weight of the surviving Fathead minnow larvae at the end of the 7 days in the control ( 0% effluent) must be 0.25 mg per larvae or greater.

(6) The percent coefficient of variation between replicates shall be 40% or less in the control (0% effluent) for the young of surviving females in the Ceriodaphnia dubia reproduction test and for the growth and survival endpoints of the Fathead minnow test.

(7) The percent coefficient of variation between replicates shall be 40% or less in the critical dilution, unless significant lethal or sublethal effects are exhibited for the young of surviving females in the Ceriodaphnia dubia reproduction test and for the growth and survival endpoints of ofthe the Fathead minnow test.

(17) 60% or more of the surviving Ceriodaphnia dubia in the control or all of the dilutions must be female. This must be confirmed at the end of the test.

e)

((e) Statistical Interpretation (1) For the Ceriodaphnia dubia survival test, the statistical analyses used to determine if there is a significant difference between the control and the critical dilution shall be in accordance with the methods for determining the No Observed Effect Concentration (NOEC) as described in EPA-821-R-02-013 or most recent update (2) For the Ceriodaphnia dubia reproduction test and the Fathead minnow larval survival and growth test, the statistical analyses used to determine if there is a significant difference between the control and the critical dilution shall be in accordance with the methods for determining the No Observed Effect Concentration (NOEC) as described in EPA-821-R-02-013 or most recent update. 03-07

Page 20 of21 Permit No. MO-009800 MO-00980011

SUMMARY

OF TEST CONDITIONS AND METHODS FOR CHRONIC WHOLE-EFFLUENT TOXICITY TESTS Chronic Whole Effluent Toxicity tests required in NPDES permits shall use the following test conditions when performing single or multiple dilution methods. Any future changes in methodology will be supplied to the permittee by the Missouri Department of Natural Resources (MDNR). Unless more stringent methods are specified by the DNR, the procedures shall be consistent with the most current edition of Short Term Methods for Measuring the Chronic Toxicity of Effluents and Receiving Waters to Freshwater Organisms.

Test conditions for Ceriodaphnia dubia:

Test type: static renewal Duration 7 days, or when 60% of control animals produce 3 broods, but not more than 8 days Effect measured decrease in reproduction, death Temperature: 25 +/- 1°C Temperatures shall not deviate by more than 3°C during the test.

Light Quality: Ambient laboratory illumination (50-100 ft-c)

Photoperiod: 16 h light, 8 h dark Size of test vessel: 30 mL (minimum)

Volume of test solution: 15 mL (minimum)

Test solution replacement frequency Daily Age of test organisms: less than 24 hour2.777778e-4 days 0.00667 hours 3.968254e-5 weeks 9.132e-6 months old No. of test concentration 5, one must be the critical dilution indicated in permit special conditions for chronic WET tests No. of animals/test vessel: 1 No. of replicates/concentration: 10 No. of organisms/concentration: 10 Feeding regime: 0.1 mg/day of trout chow, cerophyll, and yeast Aeration: None Dilution water: Upstream receiving water; if ifno no upstream flow, synthetic water modified to reflect effluent hardness.

Endpoint: The highest concentration that causes no observed effect (NOEC) and the lowest concentration that does cause an effect LOEC) for survival and reproduction

Page 21 of21 Penn it No. MO-009800 1I Test conditions for (Pimephales promelas):

Test type Static renewal Test duration: 7 days Effect measured decrease in growth (weight), death Temperature: 25 +/- 1°C Temperatures shall not deviate by more than 3°C during the test.

Light Quality: Ambient laboratory illumination (50-100 ft-c)

Photoperiod: 16 h light! 8 h dark Size of test vessel: 300-500 mL (minimum)

Volume of test solution: 250 mL (minimum)

Test solution replacement frequency Daily Age of test organisms: less than 48 hours5.555556e-4 days 0.0133 hours 7.936508e-5 weeks 1.8264e-5 months (all same age within 8 hours9.259259e-5 days 0.00222 hours 1.322751e-5 weeks 3.044e-6 months )

No. of test concentrations 5, one must be the critical dilution indicated in pennit special conditions for chronic WET test No. of animals/test vessel: 10 No. of replicates/concentration: 5 (minimum)

No. of organisms/concentration: 50 (minimum) single dilution method Feeding regime: 0.1 ml containing 700-1000 brine shrimp 3 times a day at 4 hour4.62963e-5 days 0.00111 hours 6.613757e-6 weeks 1.522e-6 months intervals Aeration: None, unless DO concentration falls below 4.0 mg/L; rate should not exceed 100 bubbles/min.

Dilution water: Upstream receiving water; ifno upstream flow, synthetic water modified to reflect effluent hardness.

Endpoint: The highest concentration that causes no observed effect (NOEC) and the lowest concentration that does cause an effect LOEC) for survival and growth (03-07)

Missouri Department of Natural Resources FACT SHEET FOR THE PURPOSE OF RENEWAL OF MO-0098001 AMEREN UE, CALLAWAY POWER PLANT The Federal Water Pollution Control Act ("Clean Water Act" Section 402 Public Law 92-500 as amended) established the National Pollution Discharge Elimination System (NPDES) permit program. This program regulates the discharge of pollutants from point sources into the waters of the United States, and the release of storm water from certain point sources. All such discharges are unlawful without a permit (Section 301 of the "Clean Water Act"). After a permit is obtained, a discharge not in compliance with all permit terms and conditions is unlawful. Missouri State Operating Permits (MSOPs) are issued by the Director of the Missouri Department of Natural Resources (department) under an approved program, operating in accordance with federal and state laws (Federal "Clean Water Act" and "Missouri Clean Water Law" Section 644 as amended). MSOPs are issued for a period of five (5) years unless otherwise specified.

As per [40 CFR Part 124.8(a)] and [10 CSR 20-6.020(1)2.] a Factsheet shall be prepared to give pertinent information regarding the applicable regulations, rationale for the development of effluent limitations and conditions, and the public participation process for the Missouri State Operating Permit (operating permit) listed below.

A Factsheet is not an enforceable part of an operating permit.

This Factsheet is for a Major IZI, I:?SI, Industrial Facility IZI I:?SI Part I - Facility Information Facility Type: Industrial Facility SIC Code(s): 4911 Facility

Description:

nuclear power plant Application Date: March 20.20.2008 2008 Expiration Date: October 2, 2008 Last Inspection: In Compliance IZI; I:?SI; OUTFALL(S TABLE:

DESIGN FLOW DISTANCE TO OUTFALL TREATMENT LEVEL EFFLUENT TYPE (CFS) CLASSIFIED SEGMENT (MI)

001 0.46 none Rad waste 0

002 22.32 none Cool tower blowdown 0

003 2.55 none Water treatment plant waste 0 Sanitary waste

007 0.06 Sanitary waste water lagoon 0 water lagoon Intake heater

009 0.009 Intake heater blowdown 0 blowdown

010 7.13 Settling pond Storm Water 1.5

011 30.54 Settling pond Storm Water 2.0

012 10.23 Settling pond Storm Water 4.5

013 eliminated --- Now flows to #012 ---

014 7.44 Settling pond Storm Water 4.0

015 4.34 Settling pond Storm Water 4.0

016 22.32 Settling pond Cooling Tower bypass 0

017 0 none Ultimate heat sink 0

Water Quality History: No significant non compliances. Had radiation (Tritium) leak in main discharge pipeline. New line is now completed.

Comments: All radioactive analytes are regulated by Nuclear Regulatory Commission, not the Missouri Department of Natural Resources.

Part II - Operator Certification Requirements As per [10 CSR 20-6.010(8) Terms and Conditions of a Permit], permittees shall operate and maintain facilities to comply with the Missouri Clean Water Law and applicable permit conditions and regulations. Operators or supervisors of operations at regulated wastewater treatment facilities shall be certified in accordance with [10 CSR 20-9.020(2)] and any other applicable state law or regulation. As per [10 CSR 20-9.01O(2)(A)], requirements for operation by certified personnel shall apply to all wastewater treatment systems, if applicable, as listed below:

Check boxes below that are applicable to the facility;

Population Equivalent greater than two hundred (200):

This facility currently requires an operator with D Certification Level. Please see Appendix 1 - Classification Worksheet.

Modifications made to the wastewater treatment facility may cause the classification to be modified.

Operator's Name: Steven Weiss, Ameren Services, 1901 Chouteau Ave, St. st. Louis, MO 63166 Certification Number: 9639 Certification Level: A Part III - Receiving Stream Information ApPLICABLE DESIGNATIONS OF WATERS OF THE STATE:

As per Missouri's Effluent Regulations [10 CSR 20-7.015], the waters of the state are divided into the below listed seven (7) categories. Each category list effluent limitations for specific parameters, which are presented in each outfall's Effluent Limitation Table and further discussed in the Derivation & Discussion of Limits section.

Missouri or Mississippi River [10 CSR 20-7.015(2)]: ~

10 CSR 20-7.031 Missouri Water Quality Standards, the department defines the Clean Water Commission water quality objectives in terms of "water uses to be maintained and the criteria to protect those uses." The receiving stream and!or and/or 1st classified receiving stream's beneficial water uses to be maintained are located in the Receiving Stream Table located below in accordance with [10 CSR 20-7.031(3)].

20-7.031 (3)].

RECEIVING STREAM{S) TABLE:

WA ATERBODY TERBODY NAME CLASS WBID DESIGNATED USES* 8-DIGIT EDU**

HUC Mud Creek U -- Narrative criteria OZARK!

MOREAU!

MOREAU/

Logan Creek U -- Narrative criteria LOUTRE 10300102 Cow Branch U -- Narrative criteria IRR,L WW,AQL,SCR, IRR,LWW,AQL,SCR, Missouri River P 00701 DWS,IND,WBC***

- Irrigation (lRR),

(IRR), Livestock & Wildlife Watering (LWW), Protection of Warm Water Aquatic Life and Human Health-Fish Consumption (AQL), Cool Water Fishery(CLF), Cold Water Fishery (CDF), Whole Body Contact Recreation (WBC), Secondary Contact Recreation (SCR), Drinking Water Supply (DWS), Industrial (IND), Groundwater (GRW).

- - Ecological Drainage Unit

- - - UAA conducted on 7-13-2005 and approved on DATE or disapproved on DATE.

RECEIVING STREAM(S) Low-FLOW VALUES TABLE:

Low-FLOW VALUES (CFS)

RECEIVING STREAM (U, C, P) lQI0 7QI0 7Q1O 30Q1O 30QI0 COW Creek U 0 0 0 Mud Creek U 0 0 0 Logan Creek U 0 0 0 Missouri River P 61,000 MIXING CONSIDERATIONS TABLE:

MIXING ZONE (CFS) ZONE OF INITIAL DILUTION (CFS)

[10 CSR 20-7.031(4)(A)4.B.(II)(a)]

20-7.031 (4)(A)4.B.(II)(a)] [10 CSR 20-7.031(4)(A)4.B.(II)(b)]

lQI0 lQ10 7Q1O 30QI0 30Q1O lQI0 lQ10 7Q1O 30Q1O 15,250 1,525 RECEIVING STREAM MONITORING REQUIREMENTS:

No receiving water monitoring requirements recommended at this time.

Part IV - Rationale and Derivation of Effluent Limitations & Permit Conditions ALTERNATIVE EVALUATIONS FOR NEW FACILITIES:

As per [10 CSR 20-7.015(4)(A)], discharges to losing streams shall be permitted only after other alternatives including land application, discharges to a gaining stream and connection to a regional wastewater treatment facility have been evaluated and determined to be unacceptable for environmental and/or economic reasons.

~;

Not Applicable [gI; The facility does not discharge to a Losing Stream as defined by [10 CSR 20-2.010(36)] & [10 CSR 20-7.031 (1 )(N)], or is an existing 20-7.031(1)(N)],

facility.

ANTI-BACKSLIDING:

A provision in the Federal Regulations [CWA §303(d)(4); CWA §402(c); 40 CFR Part 122.44(1)] that requires a reissued permit to be as stringent as the previous permit with some exceptions.

~ - All limits in this Factsheet are at least as protective as those previously established; therefore, backsliding does not apply.

[gI ANTIDEGRADATION:

In accordance with Missouri's Water Quality Standard [10 CSR 20-7.031(2)], the department is to document by means of Antidegradation Review that the use of a water body's available assimilative capacity is justified. Degradation is justified by documenting the socio-economic importance of ofaa discharging activity after determining the necessity of the discharge.

~ - Renewal - no degradation proposed and no further review necessary.

[gI ApPLICABLE PERMIT PARAMETERS:

Effluent parameters contained in Factsheets and Missouri State Operating Permits are obtained from Technology Based Effluent Limit (TBEL), Missouri's Effluent Regulations [10 CSR 20-7.015], Missouri's Water Quality Standards [10 CSR 20-7.031], previous Missouri State Operating Permits, and from Operating Permit Applications.

BIQ-SOLIDS, SLUDGE, & & SEWAGE SLUDGE:

Bio-solids are solid materials resulting from wastewater treatment that meet federal and state criteria for beneficial uses (i.e. fertilizer).

Sludge is any solid, semi-solid, or liquid waste generated from a municipal, commercial, or industrial wastewater treatment plant, water supply treatment plant, or air pollution control facility or any other such waste having similar characteristics and effect. Sewage sludge is solids, semi-solids, or liquid residue generated during the treatment of domestic sewage in a treatment works; including but not limited to, domestic septage; scum or solids removed in primary, secondary, or advanced wastewater treatment process; and a material derived from sewage sludge. Sewage sludge does not include ash generated during the firing of sewage sludge in a sewage sludge incinerator or grit and screening generated during preliminary treatment of domestic sewage in a treatment works.

Applicable (renewal and modifications to existing operating permits) 1:8:1; This facility has been approved to land apply as per Permit Standard Conditions III and a department approved bio-solids management plan.

COMPLIANCE AND ENFORCEMENT:

Enforcement is the action taken by the Water Protection Program (WPP) to bring an entity into compliance with the Missouri Clean Water Law, its implementing regulations, and/or any terms and conditions of an operating permit. The primary purpose of the enforcement activity in the WPP is to resolve violations and return the entity to compliance.

Not Applicable 1:8:1; The permittee/facility is not currently under Water Protection Program enforcement action.

PRETREATMENT PROGRAM:

The reduction of the amount of pollutants, the elimination of pollutants, or the alteration of the nature of pollutant properties in wastewater prior to or in lieu of discharging or otherwise introducing such pollutants into a Publicly Owned Treatment Works [40 CFR Part 403.3(q)].

Not Applicable 1:8:1; At this time, the permittee is not required to implement and enforce a Pretreatment Program.

REMOVAL EFFICIENCY:

Removal efficiency is a method by which the Federal Regulations define Secondary Treatment and Equivalent to Secondary Treatment, which applies to Biochemical Oxygen Demand 5-day (BODs) and Total Suspended Solids (TSS) for Publicly Owned Treatment Works (POTWs). Please see the United States Environmental Protection Agency's (EPA) website for interpretation of percent removal requirements for National Pollutant Discharge Elimination System Permit Application Requirements for Publicly Owned Treatment Works and Other Treatment Works Treating Domestic Sewage @ www.epa.gov/fedrgstrIEPA-ATERl1999/August/Day-04/w I 8866.htm W ATER/1999/

Not Applicable 1:8:1; This wastewater treatment facility is not a POTW. Influent monitoring is not being required to determine percent removal.

SANITARY SEWER OVERFLOWS (SSOs), AND INFLOW & INFILTRATION (1&1):

Collection systems are a critical element in the successful performance of the wastewater treatment process. Under certain conditions, poorly designed, built, managed, operated, and/or maintained systems can pose risks to public health, the environment, or both.

Causes of SSOs include, but are not limited to, the following: high levels of 1&1 during wet weather; blockages; structural, ofSSOs mechanical, or electrical failures; collapsed or broken sewer pipes; insufficient conveyance capacity; and vandalism. Effective and continuous management, operation, and maintenance, as well as ensuring adequate capacity and rehabilitation when necessary are critical to maintaining collection system capacity and performance while extending the life of the system .

. Not Applicable 1:8:1; This facility is not required to develop or implement a program for maintenance and repair of the collection system; however, it is a violation of Missouri State Environmental Laws and Regulations to allow untreated wastewater to discharge to waters of the state.

SCHEDULE OF COMPLIANCE (SOC):

A schedule of remedial measures included in a permit, including an enforceable sequence of interim requirements (actions, operations, or milestone events) leading to compliance with the Missouri Clean Water Law, its implementing regulations, and/or the terms and conditions of an operating permit.

Not Applicable ~;

This permit does not contain a soc.

STORM WATER POLLUTION PREVENTION PLAN (SWPPP):

A plan to schedule activities, prohibitions of practices, maintenance procedures, and other management practices to prevent or reduce the pollution of waters of the state. The plan may include, but is not limited to, treatment requirements, operating procedures, and practices to control facility site runoff, spiIlage spillage or leaks, sludge or waste disposal, or drainage from raw material storage.

Applicable ~;

A SWPPP shall be developed and implemented for storm water outfalls and shall incorporate required practices identified by the department with jurisdiction, incorporate erosion control practices specific to site conditions, and provide for maintenance and adherence to the plan .

.VARIANCE:

As per the Missouri Clean Water Law § 644.061.4, variances shall be granted for such period of time and under such terms and conditions as shall be specified by the commission in its order. The variance may be extended by affirmative action of the commission. In no event shall the variance be granted for a period of time greater than is reasonably necessary for complying with the Missouri Clean Water Law §§644.006 to 644.141 644.l41 or any standard, rule or regulation promUlgated pursuant to Missouri Clean Water Law §§644.006 to 644.141.

Not Applicable ~;

This operating permit is not drafted under premises of a petition for variance.

WASTELOAD ALLOCATIONS (WLA) FOR LIMITS:

As per [10 CSR 20-2.010(78)], the amount of pollutant each discharger is allowed by the department to release into a given stream after the department has determined to total amount of pollutant that may be discharged into that stream without endangering its water quality.

Not Applicable ~;

Wasteload allocations were not calculated.

WLA MODELING:

Not Applicable ~;

A WLA study was either not submitted or determined not applicable by department staff.

WHOLE EFFLUENT TOXICITY (WET) TEST:

A WET test is a quantifiable method of determining if a discharge from a facility may be causing toxicity to aquatic life by itself, in combination with or through synergistic responses when mixed with receiving stream water.

Applicable ~;

In accordance with the Clean Water Act (CWA) § 1100 1(a)(3), requiring WET testing is reasonably appropriate for site-specific Missouri State Operating Permits for discharges to waters of the state issued under the National Pollutant Discharge Elimination System.

Furthermore, WET testing is a means by which the department determines that [10 CSR 20-7.031(3)(D, F, & G)] are being met by the permitted facility. In addition to justification for the WET testing, WET tests are required under [10 CSR 20-6.010(8)(A)4]

20-6.01 0(8)(A)4] to be performed by specialist who are properly trained in conducting the test according to the methods prescribed by the Federal Government as referenced in [40 CFR Part 136]. l36]. WET test will be required by all facilities meeting the following criteria:

~ Facility is a designated Major.

D Facility continuously or routinely exceeds its design flow.

D Facility (industrial) that alters its production process throughout the year.

I:8l Facility handles large quantities of toxic substances, or substances that are toxic in large amounts.

I:8l Facility has Water Quality-based Effluent Limitations for toxic substances (other than NH 3 )

D Facility is a municipality or domestic discharger with a Design Flow ~ 22,500 gpd.

D Other - please justify.

303(d) LIST & TOTAL MAXIMUM DAILY LOAD (TMDL):

Section 303( d) of the federal Clean Water Act requires that each state identify waters that are not meeting water quality standards and for which adequate water pollution controls have not been required. Water quality standards protect such beneficial uses of water as whole body contact (such as swimming), maintaining fish and other aquatic life, and providing drinking water for people, livestock and wildlife. The 303( d) list helps state and federal agencies keep track of waters that are impaired but not addressed by normal water pollution control programs.

A TMDL is a calculation of the maximum amount ofa given pollutant that a body of water can absorb before its water quality is affected. If a water body is determined to be impaired as listed on the 303(d) 303( d) list, then a watershed management plan will be developed that shall include the TMDL calculation Applicable ~;

Missouri River is listed on the 2003 Missouri 303(d) List for PCBs and Chlordane.

~ - This facility is not considered to be a source of the above listed pollutant(s) or considered to contribute to the impairment of the Missouri river.

Part V - Effluent Limits Determination Outfall #001- Radwaste Treatment System - SIC #4911 (Piped to Missouri River)

Daily average flow is 0.027 MGD.

Daily maximum flow is 0.298 MGD Legal

Description:

NE v.., NE v.., Sec. 14, T46N, R8W, Callaway LatitudelLongitude: +3845424/-09146462 Receiving Stream: Missouri River (P)

First Classified Stream and ID: Missouri River (P) (00701)

USGS Basin & Sub-watershed No.: (10300102-28004)

001 EFFLUENT LIMITATIONS TABLE:

MON-BASIS DAILY WEEKLY PREVIOUS THLY MOD-PARAMETER UNIT FOR MAXI- AVER- PERMIT AVER- IFIED LIMIT MUM AGE LIMITATIONS LIMITATIONS AGE FLOW GPD 1 *

NO SAME BODs MGIL 1 *

NO SAME TSS MGIL 1 45 30 SAME pH SU 1 6-9 6-9 NO SAME CHLORINE, TOTAL MGIL 3 0.2 0.104 YES 1901* UGIL RESIDUAL OIL & GREASE (MGIL) MGIL 1 20 15 NO SAME BORON, TOTAL RECOVERABLE MGIL 3 *

NO SAME Please see Minimum Sampling and Reporting Frequency Requirements in the MONITORING FREQUENCY Derivation and Discussion Section below.

- Momtormg reqUIrement only

- -reserved

- - - Parameter not previously established in previous state operating permit.

NIA - Not applicable Basis for Limitations Codes:

1. State or Federal Regulation/Law 7. Antidegradation Policy

2. Water Quality Standard (includes RPA) 8. Water Quality Model

3. Water Quality Based Effluent Limits 9. Best Professional Judgment

4. Lagoon Policy 10. TMDL or Permit in lieu of TMDL ofTMDL

5. Ammonia Policy 11. WET Test Policy

6. Dissolved Oxygen Policy OUTFALL #001- DERIVATION AND DISCUSSION OF LIMITS:

Flow. In accordance with [40 CFR Part 122.44(i)(1 122.44(i)( 1)(ii)] the volume of effluent discharged from each outfall is needed to assure compliance with permitted effluent limitations. If the permittee is unable to obtain effluent flow, then it is the responsibility of the permittee to inform the department, which may require the submittal of an operating permit modification.

Boron. total recoverable. Monitoring only retained from previous permit, and is deemed to be protective.

Biochemicill Oxygen Demand (BOD~l. Effluent limitations have been retained from previous state operating permit, and is deemed to be protective.

Total Suspended Solids (TSS)' Limit from 40 CFR 423 .13. Effluent limitations have been retained from previous state operating permit and is deemed to be protective.

l!H.

l!.H. Limit from 40 CFR 423.13. Effluent limitations have been retained from previous state operating permit, and is deemed to be protective,

Total Residual Chlorine (TRC). 40 CFR 423 also governs this analyte in addition to the calculated limits below.

Limits have been calculated for the discharge ofTRC: Warm-water Protection of Aquatic Life CCC = 10 ug/L, CMC = 19 ug/L [10 CSR 20-7.031, Table A]. Background TRC = 0.0 ug/L.

Chronic WLA: <<0.462 + 15,250)) 1 0.462 C e = 10 ((0.462 C e =330,097 ugIL Acute WLA: <<0.462 +4.62)/0.462, C e = 19 ((0.462 +4.62)1 0.462, used 4.62 due to not over 10 times design flow rule C e = 209 ugIL L TAc = 330,097 ug/L (0.527) = 173,961 ugIL [CV == 0.6, 99th Percentile]

LTAa = 209 ug/L (0.321) = 67.08 ug/L [CV == 0.6, 99 th Percentile]

MDL = 67.08 ug/L (3.11) (3.l1) =208.64 ug/L [CV == 0.6, 99th Percentile]

AML = 67.08 ug/L (1.55)

(l.55) = 103.97 ugIL [CV == 0.6, 95 th Percentile, n == 4]

Total Residual Chlorine effluent limits of 0.209 mg/L daily maximum, 0.104 mg/L monthly average are recommended if chlorine is used as a disinfectant. Since limits at 40 CFR 423 are set below 0.209 mg/l, that limit of 0.2 mg/l will be used for daily.

& Grease. Limit from 423.13. Effluent limitations have been retained from previous state operating permit, and is deemed to Oil &

be protective.

Temperature. Monitoring Only

Minimum Sampling and Reporting Frequency Requirements. Sampling and reporting frequency requirements have been retained from previous state operating permit.

Outfall #001 WET Tests. WET Testing schedules and intervals are established in accordance with the department's Permit Manual; Section 5.2 Effluent Limits / WET Testingfor Testing/or Compliance Bio-monitoring. It is recommended that WET testing be conducted during the period of lowest stream flow.

~ Acute

~ No less than ONCE/5 YEARS: based on the fact that this is an intermittent discharge.

Allowable Emuent Concentration % for Acute WET test = (Design flow in CFS of outfall #001 1 <<7QIO ((7QlO x 0.25 x 0.1) +

(design flow in cfs of outfalls #001))

001>>

(0.447 cfs) 1 <<15,250 cfs x 0.25 x 0.1) + 0.447 cfs =0.001171 = 0.0117= 10% by default, unless diffuser is put in place.

Outfall #002 - Cooling Tower Blowdown: (Piped to Missouri River)

Daily average flow is 4.84 MGD.

Daily maximum flow is 14.4 MGD.

This outfall consists of water from the Circulating Water System, the Service Water System, and the Essential Service Water (ESW)

System. Blowdown from the cooling tower is necessary to maintain the dissolved solids concentration in the recirculating water system within acceptable operating limits. The ESW System is not routinely used, however water from the ESW System does mix with the other systems as it is periodically run to demonstrate operability. Additionally, the ESW System can be used to maintain proper freeboard in the ultimate heat sink pond (see Outfall #017 description) by transferring water to the Service Water System.

Legal

Description:

NW v.., NW v.., Sec. 13, T46N, R8W, Callaway Latitude/Longitude: +3845459/-09146388 Receiving Stream: Missouri River (P)

First Classified Stream and ID: Missouri River (P) (00701)

USGS Basin & Sub-watershed No.: (10300102-28004)

002 EFFLUENT LIMITATIONS TABLE:

BASIS MON-DAILY WEEKLY PREVIOUS FOR THLY MODI PARAMETER UNIT MAXI- AVER- PERMIT LIMIT AVER- flED FlED MUM AGE LIMITATIONS S AGE FLOW GPD 1 *

NO SAME TOTAL SUSPENDED SOLIDS MG/L 1 *

NO SAME TOTAL DISSOLVED SOLIDS MG/L 1 *

NO SAME pH SU 1 6-9 6-9 NO SAME OIL & GREASE (MG/L) MG/L 9 20 15 NO SAME SULFATE Mg/L 3 *

NO SAME TOTAL RESIDUAL mg/L 3 0.2 0.104 YES 190/*MG/L CHLORINE Please see Minimum Sampling and Reporting Frequency Requirements in the MONITORING FREQUENCY Derivation and Discussion Section below.

- Monitoring requirement only

- - - - reserved.

- - - Parameter not previously established in previous state operating permit.

N/A N/A - Not applicable Basis for Limitations Codes:

1. State or Federal Regulation/Law 7. Antidegradation Policy

2. Water Quality Standard (includes RPA) 8. Water Quality Model

3. Water Quality Based Effluent Limits 9. Best Professional Judgment

4. Lagoon Policy 10. TMDL or Permit in lieu of TMDL

5. Ammonia Policy 11. WET Test Policy

6. Dissolved Oxygen Policy OUTFALL #002 - DERIVATION AND DISCUSSION OF LIMITS:

122.44(i)(1 )(ii)] the volume of effluent discharged from each outfall is needed to assure Flow. In accordance with [40 CFR Part 122.44(i)(1)(ii)]

compliance with permitted effluent limitations. If the permittee is unable to obtain effluent flow, then it is the responsibility of the permittee to inform the department, which may require the submittal of an operating permit modification.

Total Dissolved Solids. Limit from 423.13. Monitoring retained from previous permit, and is deemed to be protective.

Total Suspended Solids (TSS). Limit from 423.13. Effluent limitations have been retained from previous state operating permit, and is deemed to be protective.

J!!!. Limit from 423.13. Effluent limitations have been retained from previous state operating permit, and is deemed to be protective.

Oil & Grease. 40 CFR 423.13

Temperature. Monitoring Only

Total Residual Chlorine (TRC).

Limits have been calculated for the discharge of TRC: Warm-water Protection of Aquatic Life CCC = 10 ug/L, CMC = 19 ug/L [10 CSR 20-7.031, Table A]. Background TRC = 0.0 ug/L.

Chronic WLA: C e = 10 <<22.32 + 15,250)) 122.32

/22.32 C e = 6842.44 ug/L Acute WLA: C e = 19 <<22.32 +223.20)/22.32, used 22.32 due to not over 10 times design flow rule C e =209. ug/L LTAc = 6842 ug/L (0.527) = 3,605 ug/L [CV = 0.6, 99th Percentile]

LTAa = 209 ug/L (0.321) = 67.08 ug/L [CV = 0.6, 99th Percentile]

MDL = 67.08 ug/L (3.11) =208.64 ug/L [CV = 0.6, 99th Percentile]

AML = 67.08 ug/L (1.55) = 103.97 ug/L [CV = 0.6, 95 th Percentile, n = 4]

Total Residual Chlorine effluent limits of 0.208 mg/L daily maximum, 0.104 mg/L monthly average are recommended if chlorine is used as a disinfectant. Since limits at 40 CFR 423 are set below 0.209 mg/l, that limit of 0.2 mg/I mg/l will be used for daily.

Outfall #002 WET Tests. WET Testing schedules and intervals are established in accordance with the department's Permit Manual; Section 5.2 Effluent Limits / WET Testing/or Compliance Bio-monitoring. It is recommended that WET testing be conducted during the period of lowest stream flow.

!Xl

~ Chronic

!Xl

~ No less than ONCEIPERMIT CYCLE:

!Xl

~ Facility is designated as a Major facility or has a design flow:::: 1.0 MGD.

!Xl

~ Facility has Water Quality-based effluent limitations for toxic substances (other than NH3).

!Xl

~ Acute

~ No less than ONCEIYEAR:

[8J

!Xl

~ Facility is designated as a Major facility or has a design flow:::: 1.0 MGD.

D Facility continuously or routinely exceeds their design flow.

D Facility exceeds its design population equivalent (PE) for BODs whether or not its design flow is being exceeded.

!Xl

~ Facility has Water Quality-based effluent limitations for toxic substances (other than NH3).

Allowable Effluent Concentration % for Acute WET test = (Design flow in CFS of outfall #002) 1 / <<7QIO x 0.25 x 0.1) +

(design flow in cfs of outfalls # 002>>

(22.32 cfs) 1/ <<(15,250 cfs x 0.25 x 0.1) + 22.32 cfs = 0.055 = 5.5%= 10% by default unless diffuser is put in place.

Critical Chronic Dilution (CCD) % for Chronic WET test= Design flow in CFS of outfalls #001, 002, 003, and 016 / <<7QI0 x 0.25) + (design flow of#OOI, 002, 003 and 016)

= 22.32 cfs 1 / <<(15,250cfs x 0.25) + (22.32 cfs) = 0.00573 = 0.573% = 10 % by default

Minimum Sampling and Reporting Frequency Requirements. Sampling and reporting frequency requirements have been retained from previous state operating permit.

Outfall #003 - Water Treatment Plant Wastes (Piped to Missouri River)

Daily average flow is 0.0 MGD.

Daily maximum flow is 1.645 MGD.

(These flows represent wastewater discharged to the settling basin, actual discharge will vary depending on recycle.) Outfall #003 consists supernatant from a wastewater treatment lagoon that treats wastewater to remove solids. The wastewater that is treated in the lagoon is mainly from the blowdown of accumulated river solids in the water treatment plant clarifiers. The sand and carbon filter backwash, oil water separator and demineralizer system wastewater is also routed to this treatment lagoon. The oil water separator flow consists of wastewater from some plant sumps as well as flow from an oil recovery well that is being used to remediate a historic on-site release. Outfall #003 is normally recycled by routing it back to the head of the water treatment plant.

Legal

Description:

SW 1;4, SW 1;4, Sec. 13, T46N, R8W, Callaway Latitude/Longitude: +3845065/-09146409 Receiving Stream: Missouri River (P)

First Classified Stream and ID: Missouri River (P) (00701)

USGS Basin & Sub-watershed No.: (10300102-28004)

003 EFFLUENT LIMITATIONS TABLE:

BASIS MON-DAILY WEEKLY PREVIOUS FOR THLY MODI PARAMETER UNIT MAXI- AVER- PERMIT LIMIT AVER- flED MUM AGE LIMIT AnONS S AGE FLOW GPD GPO 1 ** ** NO SAME TOTAL SUSPENDED SOLIDS MG/L 1 100 30 NO SAME pH SU 1 6-9 6-9 NO SAME OIL & GREASE (MG/L) MG/L 1 20 15 NO SAME TOTAL RESIDUAL MG/L 1 0.2 0.l04 0.104 YES 1901* UGIL 190/* UG/L CHLORINE Please see Minimum Sampling and Reporting Frequency Requirements in the MONITORING FREQUENCY Derivation and Discussion Section below.

- -- Monitoring requirement only

- -- # of coloniesll

- coloniesllOOmL; OOmL; the Monthly Average for Fecal Coliform is a geometric mean.

- - -- Parameter not previously established in previous state operating permit.

NI N/A - Not applicable Basis for Limitations Codes:

1. State or Federal RegulationlLaw Regulation/Law 7. Antidegradation Policy

2. Water Quality Standard (includes RPA) 8. Water Quality Model 3 Water Quality Based Effluent Limits 9. Best Professional Judgment

4. Lagoon Policy 10. TMDL or Permit in lieu of TMDL

5. Ammonia Policy 11. WET Test Policy

6. Dissolved Oxygen Policy OUTFALL #003 - DERIVATION AND DISCUSSION OF LIMITS:

Flow. In accordance with [40 CFR Part 122.44(i)(l)(ii)]

122.44(i)(1 )(ii)] the volume of effluent discharged from each outfall is needed to assure compliance with permitted effluent limitations. If the permittee is unable to obtain effluent flow, then it is the responsibility of the permittee to inform the department, which may require the submittal of an operating permit modification.

Total Suspended Solids (TSS). Limit from 423.13. Effluent limitations have been retained from previous state operating permit, and is deemed to be protective.

J!!!. Limit from 423.13.

Jll!. Effluent limitations have been retained from previous state operating permit, and is deemed to be protective.

Total Residual Chlorine (TRC)' See calculations at outfall #002 , above.

Oil & & Grease. Limit from 40 CFR 423.13. Effluent limitations have been retained from previous state operating permit, and is deemed to be protective.

Outfall #003 WET Tests. Since this flow is recycled back to treatment headworks, no WET test is required.

Minimum Sampling and Reporting Frequency Requirements. Sampling and reporting frequency requirements have been retained from previous state operating permit.

Outfall #007 - 3 Cell Flow Through Lagoon (Piped to Missouri River)

Daily average flow is 0.0 MGD.

Maximum flow is 0.040 MGD.

Design Population Equivalent is 400.

This outfall consists of a 3-celllagoon designed to receive only sanitary and on-site cafeteria waste from the plant. Sludge will be stored in the lagoon. The effluent will then be discharged to a constructed wetland. Outfall #007 is normally recycled by routing it to the water treatment plant headworks.

Legal

Description:

SW V4, SW V4, Sec. 13, T46N, R8W, Callaway LatitudelLongitude: +3845123/-091463

+3845123/-09146318 18 Receiving Stream: Missouri River (P)

First Classified Stream and ID: Missouri River (P) (00701)

USGS Basin & Sub-watershed No.: (10300102-28004)

(10300lO2-28004)

007 EFFLUENT LIMITATIONS TABLE:

BASIS MON-DAILY WEEKLY PREVIOUS FOR THLY MODI-PARAMETER UNIT MAXI- AVER- PERMIT LIMIT AVER- flED MUM AGE LIMIT AnONS LIMITATIONS S AGE FLOW GPO 1 *

NO SAME TOTAL SUSPENDED SOLIDS MGIL 1 110 llO 70 NO SAME BIOLOGICAL OXYGEN MGIL 1 65 45 NO SAME DEMANDs pH SU 1 6-9 6-9 NO SAME OIL & GREASE (MGIL) MGIL 9 15 10 YES 20/15 20115

/I00m

1100m FECAL COLIFORM L

4 *

YES ***

AMMONIAASN Mg/L 11 *

YES ***

Please see Minimum Sampling and Reporting Frequency Requirements in the MONITORING FREQUENCY Derivation and Discussion Section below.

- Monitoring requirement only

- - # of colonies/l00mL; colonies/lOOmL; the Monthly Average for Fecal Coliform is a geometric mean.

- - - Parameter not previously established in previous state operating permit.

NI N/A A - Not applicable Basis for Limitations Codes:

1. State or Federal RegulationlLaw 7. Antidegradation Policy

2. Water Quality Standard (includes RPA) 8. Water Quality Model

3. Water Quality Based Effluent Limits 9. Best Professional Judgment

4. Lagoon Policy 10. TMDL or Permit in lieu of TMDL ofTMDL

5. Ammonia Policy 11. WET Test Policy

6. Dissolved Oxygen Policy OUTFALL #007 - DERIVATION AND DISCUSSION OF LIMITS:

Flow. In accordance with [40 CFR Part 122.44(i)(

122.44(i)(I)(ii)]

1)(ii)] the volume of effluent discharged from each outfall is needed to assure compliance with permitted effluent limitations. If lfthe the permittee is unable to obtain effluent flow, then it is the responsibility of the permittee to inform the department, which may require the submittal of an operating permit modification.

Biochemical Oxygen Demand (BODs}. Effluent limitations have been retained from previous state operating permit, and is deemed to be protective. -

Total Suspended Solids (TSS). Effluent limitations have been retained from previous state operating permit, and is deemed to be protective.

l!H..

nJ!. Effluent limitations have been retained from previous state operating permit, and is deemed to be protective.

Fecal Coliform. Monitoring only added.

Oil & Grease. Conventional pollutant, effluent limitation for protection of aquatic life; 10 mg/L mgIL monthly average, 15 mg/L mgIL daily maximum.

Outfall #007 WET Tests. Since this flow is recycled back to treatment headworks, no WET test is required.

Minimum Sampling and Reporting Frequency Requirements. Sampling and reporting frequency requirements have been retained from previous state operating permit.

Outfall #009 - Intake Heater Blowdown: (Located on Missouri River)

Daily average flow 0 MGD.

Daily maximum flow is 0.006 MGD.

The river intake structure contains two recirculating electric heaters which are used to prevent ice formation on the intake bar screens during the winter months. Outfall #009 consists of discharges from the infrequent blowdown or drainage of these boilers.

Legal

Description:

NW V4, NW V4, Sec. 5, T45N, R7W, Callaway LatitudelLongitude: +3842127/-09146185

+38421271-09146185 Receiving Stream: Missouri River (P)

First Classified Stream and ID: Missouri River (P) (00701)

USGS Basin & Sub-watershed No.: (10300102-28004)

009 EFFLUENT LIMITATIONS TABLE:

BASIS MON-DAILY WEEKLY PREVIOUS FOR THLY MODI PARAMETER UNIT MAXI- AVER- PERMIT LIMIT AVER- FlED MUM AGE LIMITATIONS LIMIT ATIONS S AGE FLOW GPD 1 *

NO SAME TOTAL SUSPENDED SOLIDS MG/L 1 100 30 NO 100/30 pH SU 1 6-9 6-9 NO 6-9

& GREASE OIL&GREASE OIL MGIL 1 20 15 NO SAME Please see Minimum Sampling and Reporting Frequency Requirements in the MONITORING FREQUENCY Derivation and Discussion Section below.

- Monitoring requirement only

- - # of coloniesll OOmL; the Monthly Average for Fecal Coliform is a geometric mean.

- - - Parameter not previously established in previous state operating permit.

NIA - Not applicable Basis for Limitations Codes:

1. State or Federal RegulationlLaw Regulation/Law 7. Antidegradation Policy

2. Water Quality Standard (includes RPA) 8. Water Quality Model

3. Water Quality Based Effluent Limits 9. Best Professional Judgment

4. Lagoon Policy 10. TMDL or Permit in lieu of TMDL ofTMDL

5. Ammonia Policy 11. WET Test Policy

6. Dissolved Oxygen Policy OUTFALL #009 - DERIVATION AND DISCUSSION OF LIMITS:

009-DERIVATION

Flow. In accordance with [40 CFR Part 122.44(i)(l )(ii)] the volume of effluent discharged from each outfall is needed to assure 122.44(i)(l)(ii)]

compliance with permitted effluent limitations. If the permittee is unable to obtain effluent flow, then it is the responsibility of the permittee to inform the department, which may require the submittal of an operating permit modification.

Total Suspended Solids (TSS). Limit from 423.13. Effluent limitations have been retained from previous state operating permit, and is deemed to be protective.

nH.J!H. Limit from 40 CFR 423.13 Effluent limitations have been retained from previous state operating permit, and is deemed to be protective.

Oil &

& Grease. Limit from 40 CFR 423.13. Conventional pollutant, effluent limitation for protection of aquatic life; 10 monthly average, 15 mglL daily maximum.

Minimum Sampling and Reporting Frequency Requirements. Sampling and reporting frequency requirements have been retained from previous state operating permit.

Outfalls #010. #011. #012. #014. #015 and #017 - Storm Water Runoff For this permit cycle, Best Management Practices are being implemented. The permittee will develop a Storm Water Pollution Prevention Plan within 3 months of permit issuance and have it available at the site.

Outfall #016 - Cooling Tower Bypass (Piped to Missouri River)

Daily average flow is 3.32 MGD.

Maximum daily flow is 14.4 MGD.

This outfall consists of clarified river water and wastewater that has been recycled through the water treatment plant. It is used to moderate flow through the water treatment plant and to provide carrier water in the discharge line when discharging from Outfall

001.

Legal

Description:

NW 14, NW 14, Sec. 13, T46N, R8W, Callaway LatitudelLongitude: +3846128/-09147052 Receiving Stream: Missouri River (P)

First Classified Stream and ID: Missouri (P) (00701)

USGS Basin & Sub-watershed No.: (10300102-28004)

016 EFFLUENT LIMITATIONS TABLE:

BASIS MON-DAILY WEEKLY PREVIOUS FOR THLY MODI PARAMETER UNIT MAXI- AVER- PERMIT LIMIT AVER- FlED MUM AGE LIMITAnONS S AGE FLOW GPO GPD 1 *

NO SAME TOTAL SUSPENDED SOLIDS MGIL 1 100 30 NO 100/30 pH SU 1 6-9 6-9 NO 6-9 OIL & GREASE MGIL 1 20 15 NO SAME TOTAL RESIDUAL MgIL Mg/L 1 0.2 0.104 YES 1901* MGIL CHLORINE Please see Minimum Sampling and Reporting Frequency Requirements in the MONITORING FREQUENCY Derivation and Discussion Section below.

- Monitoring requirement only

- - # of coloniesllOOmL; colonies/lOOmL; the Monthly Average for Fecal Coliform is a geometric mean.

- - - Parameter not previously established in previous state operating permit.

NI A - Not applicable Basis for Limitations Codes:

1. State or Federal RegulationlLaw 7. Antidegradation Policy

2. Water Quality Standard (includes RPA) 8. Water Quality Model

3. Water Quality Based Effluent Limits 9. Best Professional Judgment

4. Lagoon Policy 10. TMDL or Permit in lieu of TMDL ofTMDL

5. Ammonia Policy 11. WET Test Policy

6. Dissolved Oxygen Policy OUTFALL #016 - DERIVATION AND DISCUSSION OF LIMITS:

Flow. In accordance with [40 CFR Part 122.44(i)(l)(ii)] the volume of effluent discharged from each outfall is needed to assure compliance with permitted effluent limitations. If the permittee is unable to obtain effluent flow, then it is the responsibility of the permittee to inform the department, which may require the submittal of an operating permit modification.

Total Suspended Solids (TSS). Limit from 423.13. Effluent limitations have been retained from previous state operating permit, and is deemed to be protective.

Total Residual Chlorine (TRC). See calculations at outfall #002, above.

J!I!. Limit from 423.13. Effluent limitations have been retained from previous state operating permit, and is deemed to be protective.

Oil & Grease. Limit from 423.13. Conventional pollutant, effluent limitation for protection of aquatic life; 10 mgIL monthly average, 15 mglL mg/L daily maximum.

Temperature. Monitoring Only

Outfall #016 WET Tests. WET Testing schedules and intervals are established in accordance with the department's Permit Manual; Section 5.2 Effluent Limits / WET Testingfor Compliance Bio-monitoring. It is recommended that WET testing be conducted during the period of lowest stream flow.

~ Acute

~ No less than ONCE/YEAR:

~ Facility is designated as a Major facility or has a design flow::::: 1.0 MOD.

MGD.

oD Facility continuously or routinely exceeds their design flow.

o Facility exceeds its design population equivalent (PE) for BODs whether or not its design flow is being exceeded.

D

~ Facility has Water Quality-based effluent limitations for toxic substances (other than NH3).

Allowable Emuent Concentration % for Acute WET test = (Design flow in CFS of outfall #016) / <<7QIO x 0.25 x 0.1) +

(design flow in cfs of outfalls # 002))

<<(15,250 cfs x 0.25 x 0.1) + 22.32 cfs =0.055 = 5.5%= 10% by default unless diffuser is put in place.

(22.32 cfs) / <<15,250

Minimum Sampling and Reporting Frequency Requirements. Sampling and reporting frequency requirements have been retained from previous state operating permit, and is deemed to be protective.

Part VI - Administrative Requirements On the basis of preliminary staff review and the application of applicable standards and regulations, the Department, as administrative agent for the Missouri Clean Water Commission, proposes to issue a permit(s) subject to certain effluent limitations, schedules, and special conditions contained herein and within the operating permit. The proposed determinations are tentative pending public comment.

PUBLIC NOTICE:

As per the Missouri Clean Water Law, the Missouri Clean Water Commission, and the federal Clean Water Act, persons wishing to comment on Missouri State Operating Permits are directed to do so by a department approved Public Notice coversheet. This Public Notice coversheet is attached to a Missouri State Operating Permit during the Public Notice period.

~ - The Public Notice period for this operating permit was from October 3,2008

[8J 3, 2008 to November 3,2008.

3, 2008. Responses to the Public Notice of this operating permit warranted the modification of the terms and conditions of this permit. Outfall #018 was eliminated and

the analytes and WET testing in that outfall (which was an artificial composite of other outfalls) distributed to outfalls #001, #002, and

016.

DATE OF FACT SHEET: AUGUST 13,2008 COMPLETED By:

TIM STALLMAN, ENVIRONMENTAL SPECIALIST WATER PROTECTION PROGRAM PERMITTING AND ENGINEERING SECTION NPDES AND STORM WATER PERMITS UNIT

Part VII - Appendices ApPENDIX # - CLASSIFICATION WORKSHEET:

POINTS ITEM POINTS POSSIBLE ASSIGNED Maximum Population Equivalent (P.E.) served (Max 1 pt./l0,000 pU10,000 PE or major 0

10 pts.) fraction thereof.

Maximum: 10 pt Design Flow (avg. day) or peak 1 pt. / MGD or major 0

month; use greater (Max 10 pts.) fraction thereof.

EFFLUENT DISCHARGE RECEIVING WATER SENSITIVITY:

Missouri or Mississippi River 0 0 All other stream discharges except to losing streams 1 0 and stream reaches supporting whole body contact Discharge to lake or reservoir outside of designated 2 0 whole body contact recreational area Discharge to losing stream, or stream, lake or reservoir 3 0 area supporting whole body contact recreation PRELIMINARY TREATMENT - Headworks Screening and/or comminution 3 0 Grit removal 3 0 Plant pumping of main flow (lift station at the 3 0 headworks)

PRIMARY TREATMENT Primary clarifiers 5 0 Combined sedimentation/digestion 5 0 Chemical addition (except chlorine, enzymes) 4 0 REQUIRED LABORATORY CONTROL - performed by plant personnel (highest level only)

Lab work conducted outside of plant 0 1 Push - button or visual methods for simple test such as 3 0 pH, Settleable solids Additional procedures such as DO, COD, BOD, 5 0 titrations, solids, volatile content More advanced determinations such as BOD seeding procedures, fecal coliform, nutrients, total oils, 7 0 phenols, etc.

Highly sophisticated instrumentation, such as atomic 10 0 absorption and gas chromatograph ALTERNATIVE AL TERNATIVE FATE OF EFFLUENT Direct reuse or recycle of effluent 6 0 Land Disposal - low rate 3 0 High rate 5 0 Overland flow 4 0 Total from page ONE (1) ---- I

ApPENDIX # - CLASSIFICATION WORKSHEET (CONTINUED):

POINTS ITEM POINTS POSSIBLE ASSIGNED VARIATION IN RAW WASTE (highest level only) (DMR exceedances and Design Flow exceedances)

Variation do not exceed those nonnally or typically 0 0 expected Recurring deviations or excessive variations of 100 to 2 0 200 % in strength and/or flow Recurring deviations or excessive variations of more 4 0 than 200 % in strength and/or flow Raw wastes subject to toxic waste discharge 6 0 SECONDARY TREATMENT Trickling filter and other fixed film media with 10 0 secondary clarifiers Activated sludge with secondary clarifiers (including 15 0 extended aeration and oxidation ditches)

Stabilization ponds without aeration 5 0 Aerated lagoon 8 0 Advanced Waste Treatment Polishing Pond 2 0 Chemical/physical - without secondary 15 0 Chemical/physical - following secondary 10 0 Biological or chemical/biological 12 0 Carbon regeneration 4 0 DISINFECTION Chlorination or comparable 5 0 Dechlorination 2 0 On-site generation of disinfectant (except UV light) 5 0 UV light 4 0 SOLIDS HANDLING - SLUDGE Solids Handling Thickening 5 Anaerobic digestion 10 0 Aerobic digestion 6 0 Evaporative sludge drying 2 0 Mechanical dewatering 8 0 Solids reduction (incineration, wet oxidation) 12 0 Land application 6 0 Total from page TWO (2) ----

Total from page ONE (1) ---

Grand Total --- I D - A: 71 points and greater D - B: 51 points -70 points D - C: 26 points - 50 points

[8] - D: 0 points - 25 points

ULNRC-05703, Revised NPDES Discharge Permit

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