ML052290091

Renewal of the Wastewater Discharge Permit

ML052290091
Person / Time
Site:	South Texas
Issue date:	08/03/2005
From:	Gangluff R South Texas
To:	Document Control Desk, Office of Nuclear Reactor Regulation
References
01908, G24.02, NOC-AE-05001919, STI: 31911653
Download: ML052290091 (42)

Text

I I!E Nuclear OperatIng Company 0w MMr Soth re,= Pd Ekd,* C fht Stabn PO.

Bar 2JY 4~dh.

Tow T74S)

____AAA_

August 3, 2005 NOC-AE-05001919 File No.: G24.02 IOCFR50 STI: 31911653 U. S. Nuclear Regulatory Commission Attention: Document Control Desk One White Flint North 11555 Rockville Pike Rockville, MD 20852-2738 South Texas Project Units 1 and 2 Docket Nos. STN 50-498 and STN 50-499 Renewal of the Wastewater Discharge Permit Pursuant to the South Texas Project Operating License, Appendix B (Environmental Protection Plan), Section 3.2, the South Texas Project submits the attached copy of the renewed Permit to Discharge Wastes (Permit No.

01908) from the Texas Commission on Environmental Quality. There are no substantial changes to this permit. In addition, Appendix B requires that renewed permits be reported to the NRC within 30 days following approval.

There are no commitments in this letter.

If you should have any questions on this matter, please contact S. L. Dannhardt at (361) 972-8328 or me at (361) 972-7879.

R. A. Gangluff/

Manager, Ch mistry MKK/

Attachment:

Renewed Permit to Discharge Wastes cool

NOC-AE-05001 919 Page 2 of 2 cc:

(paper copy)

(electronic copy)

Bruce S. Mallett Regional Administrator, Region IV U. S. Nuclear Regulatory Commission 611 Ryan Plaza Drive, Suite 400 Arlington, Texas 76011-8064 Richard A. Ratliff Bureau of Radiation Control Texas Department of State Health Services 1100 West 49th Street Austin, TX 78756-3189 Jeffrey Cruz U. S. Nuclear Regulatory Commission P.O. Box 289, Mail Code: MN116 Wadsworth, TX 77483 C. M. Canady City of Austin Electric Utility Department 721 Barton Springs Road Austin, TX 78704 A. H. Gutterman, Esquire Morgan, Lewis & Bockius LLP David H. Jaffe U. S. Nuclear Regulatory Commission Jack A. Fusco Michael A. Reed Texas Genco, LP C. Kirksey City of Austin Jon C. Wood Cox Smith Matthews J. J. Nesrsta R. K. Temple E. Alarcon City Public Service

TPDES PERMIT NO. WO000] 908000

[For TCEQ office use only -

EPA I.D. No. 7X00649471 TEXAS COMMISSION ON ENVIRONMENTAL QUALITY This is a renewal of TPDES Permit No.

P. O. Box 13087 WO0001908000 issuedonNovember2, AustinTexas 78711-3087 2000.

PERMIT TO DISCHARGE WASTES under provisions of Section 402 of the Clean Water Act and Chapter 26 of the Texas Water Code STP Nuclear Operating Company whose mailing address is P. 0. Box 289 Wadsworth, Texas 77483-0289.

is authorized to treat and discharge wastes from the South Texas Project Electric Generating Station (SIC 4911) located on Farm-to-Market Road 521, approximately 10 miles north of Matagorda Bay and 12 miles south-southwest of the City of Bay City, Matagorda County, Texas to Colorado RiverTidal in Segment No. 1401 of the Colorado River Basin only according to effluent limitations, monitoring requirements and other conditions set forth in this permit, as well as the rules of the Texas Commission on Environmental Quality (TCEQ), the laws of the State of Texas, and other orders of the TCEQ. The issuance of this permit does not grant to the permittee the right to use private or public property for conveyance of wastewater along the discharge route described in this permit. This includes, but is not limited to, property belonging to any individual, partnership, corporation or other entity. Neither does this permit authorize any invasion of personal rights nor any violation of federal, state, or local laws or regulations. It is the responsibility of the permittee to acquire property rights as may be necessary to use the discharge route.

This permit shall expire at midnight on December 1, 2009.

ISSUED DATE:

JUL 21 2005 For the Comrrission

EFFLUENT LIMITATIONS AND MONITORING REQUIREMENTS Outfall Number 001

1.

During the period beginning upon date of issuance and lasting through date of expiration, the permittee is authorized to discharge (*5) recirculated cooling water, cooling reservoir blowdown, previously monitored effluents, storm water, and makeup water from Colorado River subject to the following effluent limitations:

The daily average flow of effluent shall not exceed 144 million gallons per day (MGD). The daily maximum flow shall not exceed 200 MGD.

Effluent Characteristics Daily Average mg/I Discharge Limitations Daily Maximum mg/I Single Grab mg/i Minimum Self-Monitoring Requirements Report Daily Average and Daily Maximum Measurement Frequency Sample Type Flow (MGD)

Colorado River Flow (MGD) (*5)

Temperature (OF)

Total Residual Chlorine (*3)

(Report)

N/A (95 0F) (*2)

N/A (Report)

(Report)

(97 0F) (*2) 0.05:

N/A N/A NI/A N/A Continuous (* 1)

I/day (*1)

Continuous (I 1)

I/week (* 1)

Record Estimate In-Situ Grab (*4)

(* 1)

(*2)

(*3)

(*4)

(*5)

When discharge occurs from Outfall 001.

See "Other Requirements," provision No. 9.

See "Other Requirements," provision No. 5.

Samples.shall be representative of periods of chlorination.

See "Other Requirements," provision No. 4.

2.

The pH shall not be less than 6.0 standard units nor greater than 9.0 standard units and shall be monitored I/day, by grab sample.

3.

There shall be no discharge of floating solids or visible foam in other than trace amounts and no discharge of visible oil.

4.

Effluent monitoring samples shall be taken at the following location: At Outfall 001, which is at a point in the blowdown line prior to entering the Colorado River.

Page 2 of TPDES Permit No. WQ0001908000 STP Nuclear Operating Company a

EFFLUENT LIMITATIONS AND MONITORING REQUIREMENTS Outfall Number 101

l.

During the period beginning upon date of issuance and lasting through date of expiration, -the permittee is authorized to discharge low volume waste sources

(*1) commingled with previously monitored effluent (PME) from the metal cleaning waste system discharge subject to the following effluent limitations:

Volume: Plow variable.

Effluent Characteristics

• Daily Average mg/I Discharge Limitations Daily Maximum MOg/

Single Grab mg/I Minimum Self-Monitoring Requirements Report Daily Average and Daily Maximum Measurement Frequency Sample Type Flow (MGD)

Total Suspended Solids Oil and Grease (Report) 30 15 (Report) 100 20 N/A 1'00 20 I/day I/week l/week Estimate Grab ('2)

Grab (*2)

(*1)

See "Other Requirements," provision 10.

(*2)

If more than one source is associated with this particular waste category, grab samples from each source shall be analyzed and the analytical values combined on a flow weighted basis with the calculated values used to determine the "Daily Average" for the month. The highest analytical value of all grab samples for the monthly reporting period shall be reported as the "Daily Maximum."

2.

There shall be no discharge of floating solids or visible foam in other than trace amounts and no discharge of visible oil.

3.

Effluent monitoring samples shall be taken at the following location: At Outfall 101, where low volume waste sources (*1) commingled with previously monitored effluents (PME) are discharged from the neutralization basins prior to mixing with any other waste stream.

Page 2a of TPDES Permit No. WQOOO1908000 STP Nuclear Operating Company

EFFLUENT LIMITATIONS AND MONITORING REQUIREMENTS Outfall Number 201

1.

During the period beginning upon date of issuance and lasting through date of expiration, the permittee is authorized to discharge low volume waste sources

(*1) from the oily waste treatment system and storm water subject to the following effluent limitations:

Volume: Flow variable.

Effluent Characteristics Daily Average mg/I Discharge Limitations Daily Maximum mg/I Single Grab mg/I Minimum Self-Monitoring Requirements Report Daily Average and Daily Maximum Measurement Frequency Sample Type Flow (MGD)

Total Suspended Solids Oil and Grease (Report) 30 15 (Report) 100 20 N/A 100 20 I/day I/week 1/week Estimate Grab (*2)

Grab (*2)

(* 1)

See "Other Requirements," provision 10.

(*2)

If more than one source is associated with this particular waste category, grab samples from each source shall be analyzed and the analytical values combined on a flow weighted basis with the calculated values used to determine the "Daily Average" for the month. The highest analytical value ofall grab samples for the monthly reporting period shall be reported as the "Daily Maximum."

2.

There shall be no discharge of floating solids or visible foam in other than trace amounts and no discharge of visible oil.

3.

Effluent monitoring samples shall be taken at the following location: Outfall 201, where low volume waste sources are discharged from the oily waste treatment system prior to mixing with any other waste stream.

Page 2b of TPDES Permit No. WQ000 1908000 STP Nuclear Operating Company

EFFLUENT LIMITATIONS AND MONITORING REQUIREMENTS Outfall Number 401

1.

During the period beginning upon date of issuance and lasting through date of expiration, the penrnittee is authorized to discharge treated sanitary sewage commingled with car wash water and air conditioning condensate subject to the following effluent limitations:

Volume: Continuous and flow variable.

Effluent Characteristics Daily Average mg/l Discharge Limitations Daily Maximum mg/]

Single Grab mg/]

Minimum Self-Monitoring Requirements Report Daily Average and Daily Maximum Measurement Frequency Sample Type Flow (MGD)

Biochemical Oxygen Demand (S-day).

Total Suspended Solids -

(Report) 20 20 (Report) 45 45 N/A 45 45 I/day l/week l/week Estimate Grab Grab

2.

The effluent shall contain a minimum chlorine residual of 1.0 mg/l after a detention time of at least 20 minutes (based on peak flow), and shall be monitored l/week, by grab sample.

3.

There shall be no discharge of floating solids or visible foam in other than trace amounts and no discharge of visible oil.

4.

Effluent monitoring samples shall be taken at the following location: At Outfall'401, at discharge from the sewage treatment plant (West Sanitary Waste Treatment System) prior to mixing with any other waste stream.

Page 2c of TPDES Permit No. WQ000 1908000 STP Nuclear Operating Company

EFFLUENT LIMITATIONS AND MONITORING REQUIREMENTS Outfall Number 501

1.

.During the period beginning upon date of issuance and lasting through date of expiration, the permittee is authorized to discharge metal cleaning waste (* 1) subject to the following effluent limitations (*3):

Volume: Intermittent and flow variable.

Effluent Characteristics Daily Average mg/I Discharge Limitations Daily Maximum mg/l Single Grab mg/I Minimum Self-Monitoring Requirements Report Daily Average and Daily Maximum Measurement Frequency Sample Type Flow (MGD)

Iron, Total Copper, Total (Report) 1.0 0.5 (Report) 1.0 1.0 N/A 1.0 1.0 1/day (*2) 1 week (*2)

I/week (*2)

Estimate Grab Grab

(* 1)

See "Other Requirements," provision No. 7.

(*2)

When discharge occurs.

2.

There shall be no discharge of floating solids or visible foam in other than trace amounts and no discharge of visible oil.

3.

Effluent monitoring samples shall be taken at the following location: At Outfall 501, where metal cleaning wastes are discharged prior to mixing with any other waste stream.

Page 2d of TPDES Permit No. WQOOO 1908000 STP Nuclear Operating Company

• L

EFFLUENT LIMITATIONS AND MONITORING REOUIREMENTS Outfall Number 601

1.

During the period beginning upon date of issuance and lasting through date of expiration, the permittee is authorized to discharge treated sanitary sewage commingled with air conditioning condensate and HVAC cooling tower blowdown'subject to the following effluent limitations:

Volume: Continuous and flow variable.

Effluent Characteristics Daily Avera mg/l Discharge Limitations ge Daily Maximum mg/I Single Grab mg/I Minimum Self-Monitoring Requirements Report Daily Average and Daily Maximum Measurement Frequency Sample Type Flow (MGD)

Biochemical Oxygen Demand (5-day)*

Total Suspended Solids -

(Report)

- 20

- 20 (Report) 45 45 N/A 45 45 I/day Estimate I week I/week Grab Grab

2.

The effluent shall contain a minimum chlorine residual of 1.0 mg/I after a detention time of at least 20 minutes (based on peak flow), and shall be monitored I/week, by grab sample.

3.

There shall be no discharge of floating solids or visible foam in other than trace amounts and no discharge of visible oil.

4.

Effluent monitoring samples shall be taken at the following location: At Outfall 601, at discharge from the sewage treatment plant (Training Sanitary Waste Treatment Facility) prior to mixing with any other waste stream.

Page 2e of TPDES Permit No. WQOOO1908000 STP Nuclear Operating Company

STP Nuclear Operating Company TPDES Permit No. WQ0001908000 DEFINITIONS AND STANDARD PEINIIT CONDITIONS As required by Title 30 Texas Administrative Code (TAG) Chapter 305, certain regulations appear as standard conditions in waste discharge permits. 30 TAC §§ 305.121 - 305.129 (relating to Permit Characteristics and Conditions) as promulgated underthe Texas Water Code §§ 5.103 and 5.105, and the Texas Health and SafetyCode §§ 361.017 and361.024(a), establish the characteristics and standards forwaste discharge permits, including sewage sludge, andthose sections of`40 Code ofFederal Regulations (CFR) Part 122 adopted by reference by the Commission. The following text includes these conditions and incorporates them into this permit All definitions in Section 26.001 of the Texas Water Code and 30 TAC Chapter 305 shall apply to this permit and are incorporated by reference. Some specific definitions of words or phrases used in this permit are as follows:

1. Flow Measurements

a. Annual average flow - the arithmetic average ofall daily flow determinations taken within the preceding 12 consecutive calendar months. The annual average flow determination shall consist of daily flow volume determinations made by a totalizing meter, charted on a chart recorder and limited to major domestic wastewater discharge facilities with a I million gallons per day or greater permitted flow.

b.

Daily average flow - the arithmetic average of all determinations of the daily flow within a period of one calendar month. The daily average flow determination shall consist of determinations made on at least four separate days. If instantaneous measurements are used to determine the daily flow, the determination shall be the arithmetic average of all instantaneousmeasurementstaken duringthatmonth. Daily average flow determinationforintermittent discharges shall consist of a minimum of three flow determinations on days of discharge.

c.

Daily maximum flow - the highest total flow for any 24-hour period in a calendar month.

d.

Instantaneous flow - the measured flow during the minimum time required to interpret the flow measuring device.

e.

2-hour peak flow (domestic wastewater treatment plants) - the maximurn flow sustained for a two-hour period during the period of daily discharge. The average of multiple measurements of instantaneous maximum flow within a two-hour period may be used to calculate the 2-hour peak flow.

f.

Maximum 2-hour peak flow (domestic wastewater treatment plants) - the highest 2-hour peak flow for any 24-hour period in a calender month.

2.

Concentration Measurements

a.

Daily average concentration - the arithmetic average of all effluent samples, composite or grab as required by this permit, within a period of one calendar month, consisting of at least four separate representative measurements.

i.

For domestic wastewater treatment plants - When four samples are not available in a calendar month, the arithmetic average (weighted by flow) of all values in the previous four consecutive month period consisting of at least four measurements shall be utilized as the daily average concentration.

ii.

For all other wastewater treatment plants - When four samples are not available in a calender month, the arithmetic average (weighted by flow) of all values taken during the month shall be utilized as the daily average concentration.

b.

7-day average concentration - the arithmetic average of all effluent samples, composite or grab as required by this permit, within a period of one calendar week, Sunday through Saturday.

c.

Daily maximum concentration - the maximum concentration measured on a single day, by the sample type specified in the permit, within a period of one calender month.

d.

Daily discharge - the discharge of a pollutant measured during a calendar day or any 24-hour period that reasonably represents the calendar day for purposes of sampling. For pollutants with limitations expressed in terms of mass, the "daily discharge" is calculated as the total mass of the pollutant discharged over the sampling day. For pollutants with limitations expressed in other units of measurement, the "daily discharge" is calculated as the average measurement of the pollutant over the sampling day.

The "daily discharge" determination ofconcentration made using a composite sample shall be the concentration of the composite sample. When grab samples are used, the "daily discharge" determination of concentration shall be the arithmetic average (weighted by flow value) of all samples collected during that day.

e. Fecalcoliformbacteria concentration-the number of colonies of fecal coliformbacteria per 100 milliliters effluent.

The daily average fecal coliform bacteria concentration is a geometric mean of the values for the effluent samples collected in a calendar month. The geometric mean shall be determined by calculating the nth root of the product of all measurements made in a calender month, where n equals the number of measurements made; or, computed as the Page 2

. STP Nuclear Operating Company TPDES Permit No. WQOO0 1908000 antilogarithm of the arithmetic mean of the logarithms of all measurements made in a calender month. For any measurement of fecal coliform bacteria equaling zero, a substituted value of one shall be made for input into either computation method. The 7-day average for fecal coliforin bacteria is the geometric mean of the values for all effluent samples collected during a calender week.

f.

Daily average loading (lbs/day) -the arithmetic average of all daily discharge loading calculations during a period of one calender month. These calculations must be made for each'day of the month that a parameter is analyzed. The daily discharge, in terms of mass (lbs/day), is calculated as (Flow, MGD x Concentration, mg/l x 834).

g.

Daily maxirmuIm loading (Ibs/day) - the highest daily discharge, in terms 'of mass (Ibs/day), within a period of one calender month.

3.

Sample Type

a.

Composite sample -For domestic wastewater, a composite'sample is a sample made up of a minimum ofilree effluent portions collected in a continuous 24-hour period or during the period of daily discharge if less than 24 hours2.777778e-4 days <br />0.00667 hours <br />3.968254e-5 weeks <br />9.132e-6 months <br />, and combined in volumes proportional to flow, and collected at the intervals required by 30 TAC § 319.9 (a): For industrial wastewater, a composite sample is a sample made up of a minimum of three effluent portions collected in a continuous 24-hour period or during the period of daily discharge if less than 24 hours2.777778e-4 days <br />0.00667 hours <br />3.968254e-5 weeks <br />9.132e-6 months <br />, and combined in volumes proportional to flow, and collected at the intervals required by 30 TAC § 319.9 (b).

b.

Grab sample - an individual sample collected in less than 15 minutes.

4.

TreatrnentFacility(facility) -wastewaterfacilitiesused in the conveyance, storage, treatment, recycling,reclamationand/or disposal of domestic sewage, industrial wastes, agricultural wastes, recreational wastes, or other wastes including sludge handling or disposal facilities under the jurisdiction of the Commission.

5.

The term "sewage sludge". is defined as solid, semi-solid, or liquid residue generated during the treatment of domestic sewage in30 TAC Chapter312. This includes the solidswhichhavenotbeen classified as hazardous waste separated from wastewater by unit processes.

6.

Bypass - the intentional diversion of a waste stream from anyportion ofa'treatment facility.

'MONITORING AND REPORTING REQUIREMENTS

1. Self-Reporting Monitoring results shall be provided at the intervals specified in the permit. Unless otherwise specified in this permit or otherwise ordered by the Commission, the permittee shall conduct effluent sampling and reporting in accordance with 30 TAC §§ 319.4 - 319.12. Unless otherwise specified, a monthly effluent report shall be submitted each mouth, to the Enforcement Division (MC 224), by the 20th day of the following month for each discharge'which is described by this permit whether or not a discharge is made for that month. Monitoring results must be reported on an approved self-report form, that is signed and certified as required by Monitoring and Reporting Requirements No. 10.

As provided by state law, the permittee is subject to administrative, civil and criminal penalties, as applicable, for negligently orknowingly violating the Clean WaterAct, the Texas Water Code; Chapteis26,27, and 28, and Texas Health and Safety Code,'Chapter 361, including but not limited to knowingly making any false statement, representation, or certification on any report, record, or other document submitted or required to be maintained under this permit, including monitoring reports or reports of compliance or noncompliance, or falsifying, tampering with or knowingly rendering inaccurate any monitoring device or method required by this permit or violating afiy other requirement imposed by stale or federal regulations.

2.

Test Procedures Unless otherwise specified in this permit, test procedures for the analysis of pollutants shall comply with procedures specified in 30 TAC §§319.11 - 319.12. Measurements, tests and calculations shall be accurately accomplished in a representative manner.

3.

Records of Results

a.

Monitoring samples and measurements shall'be taken'at tirmes and in a manner so as to be representative of the

.monitored activity.

b.

Except for records of monitoring information required by this permit related to the permittee's sewage sludge use and disposal activities, which shall be retained for a period of at least five years (6rlongerasrequiredby4O CFR Part 503),

monitoring and reportig records, including strip charts and records of calibration and maintenance, copies of all records required by this permit, records of all data used to complete the application for this permnit, and the'certification Page 3

STP Nuclear Operating Company TPDES Permit No. WQOOO 1908000 required by 40 CFR § 264.73(b)(9) shall be retained at the facility site, or shall be readily available for review by a TCEQ representative for a period ofthree years fromthe date ofthe record or sample, measurement, report, application or certification. This period shall be extended at the request of the Executive Director.

c.

Records of monitoring activities shall include the following:

i.

date, time and place of sample or measurement;

u.

identity of individual who collected the sample or made the measurement.

iii. date and time of analysis; iv. identity of the individual and laboratory who performed the analysis;

v.

the technique or method of analysis; and vi. the results of the analysis or measurement and quality assurance/quality control records.

The period during which records are required to be kept shall be automatically extended to the date of the final disposition of any administrative or judicial enforcement action that maybe instituted against the permittee.

4.

Additional Monitoring by Permittee If the permittee monitors any pollutant at the location(s) designated herein more frequently than required by this permit using approved analytical methods as specified above, all results of such monitoring shall be included in the calculation and reporting ofthe values submitted on the approved self-report form. Increased frequency of sampling shall be indicated on the self-report form.

5. Calibration of Instruments.

All automatic flow measuring or recording devices and all totalizing meters for measuring flows shall be accurately calibrated by a trained person atplant start-up and as often thereafter as necessary to ensure accuracy, but not less often than annually unless authorizedby theExecutiveDirector for alongerperiod. Suchperson shall verify in writing that the device is operatingproperly and giving accurate results. Copies of the verification shall be retained at the facility site and/or shall be readily available for review by a TCEQ representative for a period of three years.

6.

Compliance Schedule Reports Reports of compliance or noncompliance with, or any progress reports on, interim and final requirements contained in any compliance schedule of the permit shall be submitted no later than 14 days following each schedule date to the Regional Office and the Enforcement Division (MC 224).

7. Noncompliance Notification

a.

In accordance with 30 TAC § 305.125(9) any noncompliance which may endanger human health or safety, or the environment shall be reported by the permittee to the TCEQ. Report of such information shall be provided orally or by facsimile transmission (FAX) to the Regional Office within 24 hours2.777778e-4 days <br />0.00667 hours <br />3.968254e-5 weeks <br />9.132e-6 months <br /> of becoming aware of the noncompliance.

A written submission of such information shall also be provided by the permittee to the Regional Office and the Enforcement Division (MC 224) within five working days of becoming aware of the noncompliance. The written submission shall contain a description of the noncompliance and its cause; the potential danger to human health or safety, or the environment; the period of noncompliance, including exact dates and times; if the noncompliance has not been corrected, the time it is expected to continue; and steps taken or planned to reduce, eliminate, and prevent recurrence of the noncompliance, and to mitigate its adverse effects.

b. The following violations shall be reported under Monitoring and Reporting Requirement 7.a.:

i.

Unauthorized discharges as defined in Permit Condition 2(g).

ii.

Any unanticipated bypass which exceeds any effluent limitation in the permit.

iii. Violation of a permitted maximum daily discharge limitation for pollutants listed specifically in the Other Requirements section of an Industrial TPDES permit

c.

In addition to the above, any effluent violation which deviates from the permitted effluent limitation by more than 40%

shall be reported by the permittee in writing to the Regional Office and the Enforcement Division (MC 224) within 5 working days of becoming aware of the noncompliance.

d.

Any noncompliance other than that specified in this section, or any required information not submitted or submitted incorrectly, shall be reported to the Enforcement Division (MC 224) as promptly as possible. For effluent limitation violations, noncompliances shall be reported on the approved self-report form.

8.

In accordance with the procedures described in 30 TAC §§ 35.301 - 35.303 (relating to Water Quality Emergency and Temporary Orders) if the permittee knows in advance of the need for a bypass, it shall submit prior notice by applying for such authorization.

Page 4

STP Nuclear Operating Company SgTPDES Permit No. WQOOO 1908000

9. Changes in Discharges of Toxic Substances All existing manufacturing, commercial, mining, and silvicultural permittees shall notify, the Regional Office, orally or by facsimile transmission within 24 hours2.777778e-4 days <br />0.00667 hours <br />3.968254e-5 weeks <br />9.132e-6 months <br />, and both the Regional Office and the Enforcement Division (MC 224) in writing within five (5) working days, after becoming aware of or having reason to believe:

a. That any activity has occurred or will occur which would result in the discharge, on a routine or frequent basis, of any toxicpollutant listed at 40 CFR Part 122, AppendixD, Tables II and III (excluding Total Phenols) which is not limited in the permit, if that discharge will exceed the highest of the following "notification levels":

i.

One hundred micrograms per liter (100 1tg/L);

ii.,Two hundred micrograms per liter (200 tig[L) for acrolein and acrylonitrile; five hundred micrograms per liter (500 lig/L) for 2,4-dinitrophenol and for 2-methyl-4,6-dinitrophenol; and one milligram per liter (I mgIL) for antimony; iui.

Five (5) times the maximum concentration value reported for that pollutant in the permit application; or iv. The level established by the TCEQ.

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

i.

Five hundred micrograms per liter (500 tig/L);

ii.

One milligram per liter (1 mg/L) for antimony; iii. Ten (10) times the maximum concentration value reported for that pollutant in the permit application; or iv. The level established by the TCEQ.

10. Signatories to Reports All reports and other information requested by the Executive Director shall be signed by the person and in the manner required by 30 TAC § 305.128 (relating to Signatories to Reports).

11. Al Publicly Owned Treatment Works (POTWs) must provide adequate notice to the Executive Director of the foD owing:

a. Any new introduction ofpollutants into the POTW from an indirect discharger which would be subject to section 301 or 306 of the CWA if it were directly discharging those pollutants;

b. Any substantial change in the volume or character of pollutants being introduced into that POTW by a source introducing pollutants into the POTW at the time of issuance of the permit; and

c.

For the purpose of this paragraph, adequate notice shall include information on:

i. The quality and quantity of effluent introduced into the POTW; and ii. Any anticipated impact of the change on the quantity or quality of effluent to be discharged from the POTW.

PERMIT CONDITIONS

1. General

a. When the permnittee becomes aware that it failed to submit any relevant facts in a permit application, or submitted incorrect information in an application or in any report to the Executive Director, it shall promptly submit such facts or information.

b. This permit is granted on the basis of the information supplied and representations made by the permittee during action on an application, and relying upon the accuracy and completeness of that information and those representations. After notice and opportunity for a hearing, this permit may be modified, suspended, or revoked, in whole or in part, in accordance with 30 TAC Chapter 305, SubchapterD, during its term for good cause including, but not limited to, the following:

i.

Violation of any terms or conditions of this permit; ii. Obtaining this permit by misrepresentation or failure to disclose fully all relevant facts; or iii. A change in any condition that requires either a temporary orpermanentreduction or elimination ofthe authorized discharge.

c. The permittee shall furnish to the Executive Director, upon request and within a reasonable time, any information to determine whether cause exists for amending, revoking, suspending or terminating the permit. The permittee shall also furnish to the Executive Director, upon request, copies of records required to be kept by the permit.

Page 5

I-,.2 STP Nuclear Operating Company TPDES Permit No. WQOOO 1908000

2.

Compliance

a. Acceptance of the permit by the person to whom it is issued constitutes acknowledgment and agreement that such person will comply with all the terms and conditions embodied in the permit, and the rules and other orders of the Commission.

b. The permittee has a duty to comply with all conditions of the permit Failure to comply with any permit condition constitutes a violation of the permit and the Texas Water Code or the Texas Health and Safety Code, and is grounds for enforcement action, for permit amendment, revocation or suspension, or for denial of a permit renewal application or an application for a permit for another facility.

c.

It shall not be a defense for a permittee in an enforcement action that it would have been necessary to halt or reduce the permitted activity in order to maintain compliance with the conditions of the permit.

d. The pernittee shall take all reasonable steps to minimize or prevent any discharge or sludge use or disposal or other permit violation which has a reasonable likelihood of adversely affecting human health or the environment.

e.

Authorization from the Commission is required before beginning any change in the permitted facility or activity that may result in noncompliance with any permit requirements.

f. A permit may be amended, suspended and reissued, or revoked for cause in accordance with 30 TAC §§ 305.62 and 305.66 and Texas Water Code Section 7.302. The filing of a request by the perinttee for a permit amendment, suspension and reissuance, or ternination, or a notification ofplanned changes or anticipated noncompliance, does not stay any permit condition.

g. There shall be no unauthorized discharge of wastewater or any other waste.

• For the purpose of this permit, an unauthorized discharge is considered to be any discharge of wastewater into or adjacent to water in the state at any location not permitted as an outfall or otherwise defined in the Other Requirements section of this pernit.

h. In accordance with 30 TAC § 305.535(a), the permittee may allow any bypass to occur from a TPDES permitted facility which does not cause permitted effluent limitations to be exceeded or an unauthorized discharge to occur, but only if the bypass is also for essential maintenance to assure efficient operation.

i.

The permittee is subject to administrative, civil, and criminal penalties, as applicable, underTexas Water Code §§7.051

- 7.075 (relating to Administrative Penalties), 7.101 - 7.111. (relating to Civil Penalties), and 7.141 - 7.202 (relating to Criminal Offenses and Penalties) for violations including,.but not limited to, negligently or knowingly violating the federal Clean Water Act, §§ 301,302, 306,307, 308, 318, or 405, or any condition or limitation implementing any sections in a permit issued under the CWA § 402, or any requirement imposed in a pretreatment program approved under the CWA §§ 402 (a)(3) or 402 (b)(8).

3. Inspections and Entry

a. Inspection and entry shall be allowed as prescribed in the Texas Water Code Chapters 26,27, and 28, and Texas Health and Safety Code Chapter 361.

b. The members of the Commission and employees and agents of the Commission are entitled to enter any public or private property at any reasonable time for the purpose of inspecting and investigating conditions relating to the quality of water in the state or the compliance with any rule, regulation, permit or other order of the Commission. Members, employees, or agents of the Commission and Commission contractors are entitled to enter public or private property at any reasonable time to investigate or monitor or, if the responsible party is not responsive or there is an immediate danger to public health or the environment, to remove or rernediate a condition related to the quality of water in the state. Members, employees, Commission contractors, or agents acting under this authority who enter private property shall observe the establishment's rules and regulations concerning safety, internal security, and fire protection, and if the property has management in residence, shall notify management or the person then in charge of his presence and shall exhibit proper credentials.

If any member, employee, Commission contractor, or agent is refused the right to enter in or on public or private property under this authority, the Executive Director may invoke the remedies authorized inTexasWater Code Section 7.002. The statementabove, that Commission entry shall occur in-accordance with an establishment's rules and regulations concerning safety, internal security, and fire protection, is not grounds for denial or restriction of entry to any part of the facility, but merely describes the Commission's duty to observe appropriate rules and regulations during an inspection.

4. Permit Amendment and/or Renewal

a. The permittee shall give notice to the Executive Director as soon as possible of any planned physical alterations or additions to the permitted facility if such alterations or additions would require a permit amendment or result in a violation of permit requirements. Notice shall also be required under this paragraph when:

Page 6

STP Nuclear Operating Company TPDES Permit No. WQ0001908000

i.

The alteration or addition to a permitted facility may meet one of the criteria for determining whether a facility is a new source in accordance with 30 TAC § 305.534 (relating to New Sources and New Dischargers); or ii. The alteration or addition could significantly change the nature or increase the quantity of pollutants discharged.

This notification applies to pollutants which are subject neither to effluent limitations in the permit, nor to notification requirements in Monitoring and Reporting Requiremrents No. 9; iii. The alteration or addition results in a significant change in the permittee's sludge use or disposal practices, and such alteration, addition, or change may justify the application of permit conditions that are different from or absent in the existing permit, including notification of additional use or disposal sites not reported during the permit application process or not reported pursuant to an approved land application plan.

b. Prior to any facility modifications, additions, or expansions that will increase the plant capacity beyond the permitted flow, the permittee must apply for and obtain proper authorization from the Commission before commencing construction.

c.

The permittee must apply for an amendment or renewal prior to expiration of the existing permit in order to continue a permitted activity after the expiration date of the permit. If an application is submitted prior to the expiration date of the permit, the existing permit shall remain in effect until the application is approved, denied, or returned. If the application is returned or denied, authorization to continue such activity shall terminate upon the effective date of the action. If an application is not submitted prior to the expiration date of the permit, the permit shall expire and authorization to continue such activity shall terminate.

d. Prior to accepting or generating wastes which are not descnbed in the permit application or which would result in a significant change in the quantity or quality of the existing discharge, the permittee must report the proposed changes to the Commission. The permittee must apply for a permit amendment reflecting any necessary changes in permit conditions, including effluent limitations for pollutants not identified and limited by this permit.

e.

In accordance with the Texas Water Code § 26.029(b), after a public hearing, notice of wihich shall be given to the permittee, the Commission may require the permittee, from time to time, forgood cause, in accordance with applicable

• laws, to conforin to new or additional conditions.

f. If any toxic effluent standard or prohibition (including any schedule of compliaice specified in such effluent standard or prohibition) is promulgated under-Section 307(a) of the Clean Water Act for a toxic pollutant which is present in the discharge and that standard or prohibition is more stringent than any liriiitation'on the pollutant in this permnit, this permit shall be modified or revoked and reissued to conform to the toxic effluent standard or prohibition. The permittee

-shall comply with effluent standards orprohbitiois established under Section 3 07(a) ofthe Clean Water Act for toxic pollutants within the time provided in the regulations that established those standards or prohibitions, even if the permit has not yet been modified to incorporate the requirement.

5. Permit Transfer

a.

Prior to any transfer of this-permit, Commission approval must be obtained. The Commission shall be notified in writing of any change in control or ownership of facilities authorized by this permit. Such notification should be sent to the Water Quality Applications Team (MC 161) of the Registration, Review and Reporting Division.

b.

Apermitrmaybe transferred only according to the provisions of3O TAC § 305.64 (relatingtoTransfer ofPennits) and 30 TAC § 50.133 (relating to Executive Director Action on Application or WQMP update).

6. Relationship to Hazardous Waste Activities This permit does not authorize any activity of hazardous waste storage, processing, or disposal which requires a permit or other authorization pursuant to the'Texas Health and Safety Code.

7. Relationship to Water Rights Disposal of treated effluent by any means other than discharge directly to water in the state must be specifically authorized in this permit and may require a permit pursuant to Chapter 11 of the Texas Water Code.

8. Property Rights A permit does not convey any property rights of any sort, or any exclusive privilege.

9.

Permnit Enforceability The conditions of this permit are severable, and if any provision of this permit, or the application of any provision of this Page 7

ST? Nuclear Operating Company TPDES Permit No. WQOOO1908000 permit to any circumstances, is held invalid, the application of such provision to other circumstances, and the remainder of this permit, shall not be affected thereby.

10. Relationship to Permit Application The application pursuant to which the permit has beert issued is incorporated herein; provided, however, that in the event of a conflict between the provisions of this permit and the application, the provisions of the permit shall control.

II. Notice of Bankruptcy.

a.

Each permittee shall notify the executive director, in writing, immediately following the filing of a voluntary or involuntary petition for bankruptcy under any chapter of Title 11 (Bankruptcy) of the United States Code (11 USC) by or against:

i.

the peimittee; ii. an entity (as thattermis defined in 11 USC, §101(15)) controlling the permittee or listing the permit or pernittee as property of the estate; or iii. an affiliate (as that term is defined in 11 USC, §101(2)) of the permittee.

b. This notification must indicate:

i.

the name of the permittee; iu. the permit number(s);

iii. the bankruptcy court in which the petition for bankruptcy was filed; and iv. the date of filing of the petition.

OPERATIONAL REQUIREMENTS

1. The permittee shall at all times ensure that the facility and all of its systems of collection, treatment, and disposal are properly operated and maintained. This includes, but is not limited to, the regular, periodic examination of wastewater solids within the treatment plant by the operator in order to maintain an appropriate quantity and quality of solids inventory as described in the various operator training manuals and according to accepted industry standards for process control.

Process control, maintenance, and operations records shall be retained at the facility site, or shall be readily available for review-by a TCEQ representative, for a period of three years.

2.

Upon request by the Executive Director, the permittee shall take appropriate samples and provide proper analysis in order to demonstrate compliance with Commission rules. Unless otherwise specified in this permit or otherwise ordered by the Commission, the pemnittee shall comply with all applicable provisions of 30 TAC Chapter 312 concerning sewage sludge use and disposal and 30 TAC §§ 319.21 - 319.29 concerning the discharge of certain hazardous metals.

3.

Domestic wastewater treatment facilities shall comply with the following provisions:

a.

Thepermittee shall notify the Municipal Permits Team, WastewaterPermitting Section (MC 148) of the Water Quality Division, in writing, of any facility expansion at least 90 days prior to conducting such activity.

b.

The permittee shall submit a closure plan for review and approval to the Agriculture and Sludge Team, Wastewater Permitting Section (MC 14 8) of the Water Quality Division, for any closure activity at least 90 days prior to conducting such activity. Closure isthe act of permanentlytaking awastemanagementunitortreatment facility out of service and includes the permanent removal from service of any pit, tank, pond, lagoon, surface impoundment and/or other treatment unit regulated by this permit.

4.

The permittee is responsible for installing prior to plant start-up, and subsequently maintaining, adequate safeguards to prevent the discharge of untreated or inadequately treated wastes during electrical power failures by means of alternate power sources, standby generators, and/or retention of inadequately treated wastewater.

5.

Unless otherwise specified, the permittee shall provide a readily accessible sampling point and, where applicable, an effluent flow measuring device or other acceptable means by which effluent flow may be determined.

6.

The pennittee shall remit an annual water quality fee to the Commission as required by 30 TAC Chapter 21. Failure to pay the fee may result in revocation of this permit under Texas Water Code § 7.302(b)(6).

7.

Documentation For all written notifications to the Commission required of the permittee by this permit, the permittee shall keep and make available a copy of each such notification under the same conditions as self-monitoring data are required to be kept and made available. Except for information required for TPDES permit applications, effluent data, including effluent data in perrnits; draft permits and permit applications, and other information specified as not confidential in 30 TAC § 1.5(d), any Page 8

STP Nuclear-Operating Company TPDES Permiit No. WQ0001908000 information submitted pursuant to this permit may be claimed as confidential by the submitter Any such claim must be asserted in the manner prescribed in the application form or by stamping the words "confidential business information" on each page containing such information. lfno claim is made at the time of submission, information may be made available to the public without further notice. If the Commission or Executive Directoragrees with the designation of confidentiality, the TCEQ will mot provide the information for public inspection unless required by the Texas Attomey General or a court pursuant to an open records request. If the Executive Director does not agree with the designation of confidentiality, the person submitting the information will be notified.,

8. Facilities which generate domestic waste'water shall comply with the following provisions; domestic wastewater treatment facilities at permitted industrial sites are excluded.

a. Whenever flow measurements for any domestic sewage treatment facility reach 75 percent of the permitted daily average or annual average flow for three consecutive months, the permittee must initiate engineering and financial planning for expansion and/or upgrading of the domestic wastewater treatment and/or collection facilities. Whenever the flow reaches 90 percent of the permitted daily average or annual average flow for three consecutive months, the permittee shall obtain necessary authorization from the Comnrnission to commence construction of the necessary additional treatment and/or collection facilities. In the case of a domestic wastewater treatment facility which reaches 75 percent of the permitted daily average or annual average flow for three consecutive months, and the planned population to be served or the quantity of waste produced is not expected to exceed the design limitations of the treatment facility, the permittee shall submit an engineering report supporting this claim to the Executive Director of the Commission.

If in the judgernent of the Executive Director the population to be served will not cause pernit noncompliance, then the requirement of this section may be waived.. To be effective, any waiver must be in writing and signed by the Director of the Enforcement Division (MC 149) of the Commission, and such waiver of these requirements will be reviewed upon expiration of the existing permit; however, any such waiver shall not be interpreted as condoning or excusing any violation of any permit parameter.

b. The plans and specifications for domestic sewage collection and treatment works associated with any domestic permit must be approved by the Comrnission, and failure to secure approval before commencing construction of such works or malcing a discharge is a violation of this permit and each day is an additional violation until approval has been secured.

c.

Permits fordomestic wastewater treatmentplants are granted subject to thepolicy ofthe Commissionto encourage the development of area-wide waste collection, treatment and disposal systems. The Commission reserves the right to amend any domestic wastewater permit in accordance with applicable procedural requirements to require the system

• covered by this permit to be integrated into an area-wide system, should such be developed; to require the delivery of the wastes authorized to be collected in, treated by or discharged from said system, to such area-wide system; or to amend this permit in any other particular to effectuate lhe Commission's policy. Such amendments maybe made when the changes required are advisable for water quality control purposes and are feasible on the basis of waste treatment technology, engineering, financial, and related considerations existing at the time the changes are required, exclusive of the loss of investment in or revenues from any then existing or proposed waste collection, treatment or disposal system.

9. Domestic wastewater treatmentplants shallbe operated and maintained bysewage plant operators holding a valid certificate of competency at the required level as defined in 30 TAC Chapter 30.

10. For Publicly Owned Treatment Works (POTWs), the 30-day average (or monthly average) percent removal for DOD and TSS shall not be less than 85 percent, unless otherwise authorized by this permit.

11. Facilities which generate industrial solid waste as defined in 30 TAC § 335.1 shall comply with these provisions:

a..Anysolid waiste, as definedin 30 TAC § 335.1 (includingbutnot limited to suchwastes as garbage, refuse, sludge from a waste treatment, watersupply treatmentplant or airpollution control facility, discarded materials, discarded materials to be recycled, whether the waste is solid, liquid, or semisolid), generated by the perrnittee during the management and treatment of wastewater, must be managed in accordance with all applicable provisions of 30 TAC Chapter 335, relating to Industrial Solid Waste Management.

b.

Industrial wastewater that is being collected, accumulated, stored, or processed before discharge through any final discharge outfall, specified by this permit, is considered to be industrial solid waste until the wastewater passes through the actual point source discharge and must be managed in accordance with all applicableprovisions of30 TAC Chapter 335.

c. The permittee shall provide written notification, pursuant to the requirements of 30 TAC § 335.8(b)(1), to the Corrective Action Section (MC 127) of the Remediation Division informing the Commission of any closure activity involving an Industrial Solid Waste Management Unit, at least 90 days prior to conducting such an activity.

Page 9

l STP Nuclear Operating Company TPDES Permit No. WQ000 1908000

d.

Construction of any industrial solid waste management unit requires the prior written notification of the proposed activity to the Registration and Reporting Section (MC 129) of the Registration, Review, and Reporting Division. No person shall dispose of industrial solid waste, including sludge or other solids from wastewater treatment processes, prior to fulfilling the deed recordation requirements of 30 TAC § 335.5.

e.

The term "industrial solid waste management unit" means a landfill, surface impoundment, waste-pile, industrial furnace, incinerator, cement kiln, injection well, container, drum, salt dome waste containment cavern, or any other structure vessel, appurtenance, or other improvement 6n land used to manage industrial solid waste.

f.

The permittee shall keep ranagement records for all sludge (or other waste) removed from any wastewater treatment process. These records shall fulfill all applicable requirements of 3 0 TAC Chapter 33 5 and must include the following, as it pertains to wastewater treatment and discharge:

i.

Volume of waste and date(s) generated from treatment process; ii.

Volume of waste disposed of on-site or shipped off-site; iii. Date(s) of disposal; iv. Identity of hauler or transporter;

v.

Location of disposal site; and vi. Method of final disposal.

The above records shall be maintained on a monthly basis. The records shall be retained at the facility site, or shall be readily available for review by authorized representatives of the TCEQ for at least five years.

12: For industrial facilities to which the requirements of 30 TAC Chapter 335 do not apply, sludge and solid wastes, including tank cleaning and contaminated solids for disposal, shall be disposed ofin accordance with Chapter 361 ofthe Texas Health and Safety Code.

TCEQ Revision 0512004 Page 10

STP Nuclear Operating Company TPDES Permit No. WQOOO90 8000 OTHER REOUIREMENTS I. The Executive Director has reviewed this action for consistency with the goals and policies of the Texas Coastal Management Program (CMP) in accordance with the regulations of the Coastal Coordination Council (CCC) and has determined that the action is consistent with the applicable CMP goals and policies:

2. Violations of daily maximum limitations for the following pollutants shall be reported orally or by facsimile to TCEQ Region 12, within 24 hours2.777778e-4 days <br />0.00667 hours <br />3.968254e-5 weeks <br />9.132e-6 months <br /> from the time the pernittee becomes aware of the violation followed by a written report'within five working days to TCEQ Region 12 Office and the Enforcement Division (MC 224):

POLLUTANT MAL (mA)

Copper, Total 0.010 Iron, Total Test methods utilized shall be sensitive enough'to demonstrate compliance with the permit effluent limitations.

Permit compliance/noncompliance determinations will be based on the effluent limitations contained in this permit with consideration given to the MAL for the parameters specified above.

When an analysis of an effluent sample for any of the parameters listed above indicates no detectable levels above the MAL and the test method detection level is as sensitive as the specified MAL, a value of zero (0) shall be used for that measurement when determining calculations and reporting requirements for the self-reporting form. This applies to determinations of daily maximum concentration, calculations of loading and daily averages, and other reportable results.

When a'reported value is zero (0) based on this MAL provision, the permittee shall submit the following statement with the self-reporting form either as a separate attachment to the form or as a statement in the comments section of the form.

"The reported value(s) of zero (0) for

[list narameter(s)l on the self-reporting forni for the term ofthis permit is based on the following conditions: 1) the analytical method used had a method detection level as sensitive as the MAL specified in the permit, and 2) the analytical results contained no detectable levels above the specified MAL.'

When an analysis of an effluent sample for a parameter indicates no detectable levels and the test method detection level is not as sensitive as the MAL specified in the permit, or an MAL is not specified in the permit for that parameter, the level of detection achieved shall be used for that measurement when determining calculations and reporting requirements for the self-reporting form. A zero (0) may not be used.

3. The discharges from sources such as reservoir relief wells, reservoir spillway gate leakage, condenser box drainage, ground water monitoring wells, and process monitoring instrumentation are authorized. These sources may discharge to the Colorado River, to the West Branch of the Colorado River, to Little Robbins Slough and the East Fork of Little Robbins Slough.

4. For Outfall 001, the discharge from the cooling pond shall not exceed 12.5% ofthe flow ofthe Colorado River at the discharge point and there shall be no discharge from Outfall 001 when the receiving water flow adjacent to the plant is less than 800 cubic feet per second.

5. Total Residual Chlorine:

'The term "total residual chlorine" (or total residual oxidants for intake water with bromides) means'the value obtained using the amperometric method for total residual chlorine described in 40 CFR Part 136. The perrmttee may use the DPD spectrophotometric method (EPA Method 330.5) upon written notification of the Executive Director, provided that EPA has modified the existing effluent limitation guidelines (40 CFR Part 423) or has provided the permittee with demonstration that this new method is appropriate for use by steam electric power generating facilities.

Total residual chlorine may not be discharged from any single generating unit for more than two hours per day unless the discharger demonstrates to the permitting authority that discharge for more than two hours is required for macroinvertebrate control.

Simultaneous multi-unit chlorination is permitted.

Page 11

STP Nuclear Operating Company TPDES Permit No. WQOOO 1908000

6. There shall be no discharge of polychlorinated biphenyl transformer fluid.

7. The term "metal cleaning waste" means any wastewater resulting from cleaning (with or without chemical compounds) any metal process equipment including, but not limited to, boiler tube cleaning, boiler fireside cleaning, and air preheater cleaning.

8. The term "chemical metal cleaning waste" means any wastewater resulting from the cleaning of any metal process equipment with chemical compounds, including, but not limited to, boiler tube cleaning.

9. For the purposes of this permit, daily temperature discharge is defined as the flow weighted average temperature (FWAT) and shall be computed and recorded on a daily basis. FWVAT shall be computed at equal time intervals not greater than two hours. The method of calculating FWAT is as follows:

F(ONSTANTANEOUS FLOW X INSTANTANEOUS TEMPERATURE)

E(INSTANTANEOUS FLOW)

"Daily average temperature" shall be the arithmetic average of all FWAT's calculated during the calender month. "Daily maximum temperature" shall be the highest FWAT calculated during the calender month.

10. The term "low volume waste sources" means, taken collectively as if from one source, wastewaters from all sources except those for which specific limitations are otherwise established. Low volume waste sources includebut are notlimited to: wet scrubberairpollution controlsystems, ion exchangewate treatment systems, watertreatinent evaporatorblowdown, laboratory and sampling streams,boilerblowdown, floordrains, cooling tower basin cleaning wastes and blowdown from recirculating house service water systems. Sanitary and air conditioning wastes are not included.

11. This provision supersedes and replaces Provision 1, Paragraph 1 of Monitoring and Reporting Requirements found on Page 4 of this permit.

Monitoring results shall be provided at the intervals specified in the pernit. Unless otherwise specified in this permit or otherwise ordered by the Commnission, the permittee shall conduct effluent sampling and reporting in accordance with 30 TAC §§319.4 - 319.12. Unless otherwise specified, a monthly effluent report shall be submitted each month, to the location(s) specified on the reporting form or the instruction sheet, by the 25th day of-the following month for each discharge which is described by this permit whether or not a discharge is made for that month. Monitoring results must be reported on the approved TPDES self-repoi-ting form, Discharge Monitoring Report (DMR) Form EPA No. 3320-1, signed and certified as required by Monitoring and Reporting Requirements No. 10.

12. The mixing zone is defined as a volume within a radius of 60 feet extending over the receiving waters from the point where discharge from each jet port enters the Colorado River.. Chronic toxic criteria apply at the edge of the mixing zone.

13. Daily average concentration shall mean the arithmetic average (weighted by flow) of all effluent samples, composition or grab as required by this permitwithin a period of one calender month, consisting of at least four separate representativemeasurements. When foursamples are not available in a calendermonth, the arithmetic average (weighted by flow) of the four most recent measurements or arithmetic average (weighted by flow) of all values taken during the month shall be utilized as the daily average concentration.

The provision supersedes and replaces Provision 2(a), Daily Average Concentration, as defined on page 3 of this permit

14. The permittee shall comply with the Cooling Water Intake regulations found in Title 40 Code of Federal Regulations Part 125, Subpart J. These regulations include, but-are not limited to the following provisions:

a. the permittee shall submit four copies of the Proposal for Information Collection to the Industrial Team (MC-148) of the Water Quality Division prior to the start of information collection activities, and

b. the permnittee shall submit four copies of the completed Comprehensive Demonstration Study (if required by 40 CFR Part 125, Subpart J) to the Industrial Team (MC-148) of the Water Quality Division no later than January 7, 2008.

Page 12

STP Nuclear Operating Company TPDES Permit No. NVQ0001 908000 The permittee shall meet all other applicable requirements of this regulation.

15. WVastewater discharged via Outfall 001 shall be sampled and analyzed for, those parameters listed on (Tables 1, 2, and 3) of this permit for a minimum of four (4) separate samp]ing-events which are a minimum of one (1) week apart..Attachment 1 (Tables 1, 2 and 3) shall be completed with the an-alytical results for each outfall and sent to the TCEQ, Wastewater Permiting Section (MC-148), Industrial Team.

Analytical testing for Outfall 001 shall be conducted with first available discharge events following permit issuance. -Based on a technical review of the submitted analytical results, an amendment may be initiated by

-TCEQ staff to include additional effluent limitations andlor monitoring requirements.

'-1 Page 13

_I STP Nuclear Operating Company TPDES Permit No. WQ0001908000 ATTACHMIENT 1 TARTLF. 1:

Outfal No.:

C OG Emuent Concentralon (m

)

Pollutants Sam S nP.2 Samp. 3 Sanp. 4 Averaoe BOD (5-day)

CBOD (5-day)

Chemical Oxygen Demand Total Organic Carbon Amrnonia Nitrogen Total Suspended Solids Nitrate Nitrogen Total Organic Nitrogen Total Phosphorus Oil and Grease Total Residual Chlorine Total Dissolved Solids Sulfate Chloride Fluoride Fecal Coliform Temperature (VF) pH (Standard Units; minimax)

Effluent Concentration (PJJ)

MAL (ag/f)

Total Aluminum 30 Total Antimony 30 Total Arsenic 10 Total Barium 10 Total Beryllium 5

Total Cadmium I

Total Chromium 10 Trivalent Chromium N/A Hexavalent Chromium 10 Total Copper 10 Cyanide 20 Total Lead 5

Total Mercury 0.2 Total Nickel 10 Total Selenium 10 Total Silver 2.0 Total Thallium 10 Total Zinc 5

Page 14

STP Nuclear Operating Company TPDES Permit No. WQOOO 1908000 ATTACHMENT I TABLE 2:

Outfall No.:

OC OG Effluent Concentration (uzfl) (* I Pollutants

Samp.1 Samp. 2 Sanp. 3 Sarnp. 4 Average.

MAL Benzene I

10 Benzidine

.,_50 fBenzo(a)anthracene 10 Benzo(a)pvrene 0

Carbon Tetrachloride

.._-_10 Chlorobenzene 10 Chloroform I 0 Chrvsene 10 Cresols

.____*2)

Dibromochloromethane

_._.___10 1,2-Dibromoethane

_2 1,4-Dichlbrobenzene 10 1,2-Dicbloroethane 10 I.. 1 -Diceloroethylene 10 Fluoride Soo

.00

Hexacblorobenzene.

.10

,Hexachlorobutadiene 10 Hexachloroethane 20 Methyl Ethyl Ketone 50 Nitrobenzene 10 n-Nitrosodiethylamine 20 n-Nitroso-di-n-Butylamnine 20 PCB's, Total (*3)

I Pentacblorobenzene 20 Pentachlorophenol

._._._50 Phenanthrene 10 Pvridine 20 1,2,4,5-Tetrachlorobenzene 20 Tetrachloroeftlene 10 Trichloroethylene 10 1.1.1 -Trichloroethane 10 2,4,5-Trichlorophenol

.s.

50 TTHM (Total Trihalomethanes) 10 Vinyl Chloride 10

(*I)

Indicate units if different from pg/l.

(*2)

MAL's for Cresols: p-Chloro-m-Cresol 10 pLg/l; 4,6-Dinitro-o-Cresol 50 pg/l; p-Cresol 10 pg/l

(*3)

Total of PCB-1242, PCB-1254, PCB-1221, PCB-1232, PCB-1248, PCB-1260, PCB-1016.

Page 15

'LLI STP Nuclear Operating Company TPDES Permit No. WQOOO 1908000 ATTACHMENT I TA. n V I.

Outfall No.:

D DC DC Believed Believed Effluent Cone ntrntion (mrnd Pollutants Present Absent Averaoe Maximum No. of Samples Bromidle.

Color (PCU')

Nitrate-Nitrite(as N)

Sulfide(a's S)

Sulfite(as SO3)

Surfactants.

Total Antimony.

Total Beryllium n Total Boron Total Cobalt Total Iron Total Magnesium Total Molybdenum Total Manganese Total Thallium Total Tin

.Total Titanium..

Page 16

STP Nuclear Operating Company TPDES Permit No. WQOOO 1908000 CHRONIC BIOMONITORING REOUIREMEN`TS: MARINE The provisions of this Section apply to Outfall 001 for whole effluent toxicity testing (biomonitoring).

1.

Scope -Frequency and Methodology

a.

The permittee shall test the effluent for toxicity in accordance with the provisions below. Such testing will determine if an appropriately dilute effluent sample adversely affects the survival, reproduction, or growth of the test organisms.

b.

The permittee shall conduct all toxicity tests utilizing the test organisms, procedures, and quality assurance requirements specified below and in accordance with "Short-Term Methods for Estimating the Chronic Toxicity of Effluents and Receiving Waters to Marine and Estuarine Organisms, Third Edition" (EPA-821-R-02-014), or the most recent update thereof:

1)

Chronic static renewal 7-day survival and growth test using the mysid shrimp (Mysidopsis bahia) (Method 1007.0 or the mostrecent update thereof). A minimum of eight replicates with five organisms per replicate shall be used in the control and in each dilution. This test shall be conducted once per quarter.

2)

Chronic static renewal 7-day larval survival and growth test using the inland silverside (Menidia beryllina) (Method 1006.0 or the most recent update thereof). A minimum of five replicates with eight organisms per replicate shall be used in the control and in each dilution.

This test shall be conducted once per quarter.

The permittee must perform and report avalid test for eachtest species during the prescribedreporting period. An invalid test must be repeated during the same reporting'period. An invalid test is herei defined as any test failing to satisfy the test acceptability criteria, including Percent Minimum Significant Difference (PMSD) boundary requirements, procedures, and quality assurance requirements specified in -the test methods and permiit. All test results, valid or invalid, must be submitted as described below.

c.

The permittee shall use five effluent dilution concentrations and a control in each toxicity test. These additional effluent concentrations are 5%, 7%, 10%, 13%, and 17% effluent.' The critical dilution, defined as 13% effluent, is the effluent concentration representative of the proportion of effluent in the receiving water during critical low flow or critical mixing conditions.

d.

This permit may be amended to require a Whole Effluent Toxicity (WET) limit, Chemical-Specific (CS) limits, a Best Management Practice (BMP), additional toxicity testing, and/or other appropriate actions to address toxicity. The permittee may be required to 'conduct additional biomonitoring tests and/or a Toxicity Reduction Evaluation (TRE) if biomonitoring data indicate multiple numbers of unconfirmed toxicity events.

e.

Testing Frequency Reduction

1)

If none of the first four consecutive quarterly tests demonstrates significant lethal or sub-lethal effects, theperrnittee may submit this information in writing and, upon approval from theWater Quality Standards Team, reduce the testing frequency'to once per six months for the invertebrate test species and once per year for the vertebrate test species.

2)

If one or more of the first four consecutive quarterly tests demonstrates significant sub-lethal effects, the permittee shall continue quarterly testing for that species until four consecutive quarterly tests demonstrate no significant sub-lethal effects: Atthat time, the pernittee may apply for the appropriate testing frequency reduction for that species.

3)

If one or more of the first four consecutive quarterly tests demonstrates significant lethal effectsthepermittee shall continuequarterlytesting forthatspeciesuuntil thepermitisreissued.

If a testing frequency reduction had been previously granted and a subsequent test demonstrates significant lethal effects, the perrmittee will resume a quarterly testing frequency for that species until the permit is reissued.

Page 17

STP Nuclear Operating Company TPDES Permit No. WQOOO 1908000

2.

Required Toxicity Testing Conditions

a.

Test Acceptance - The permittee shall repeat any toxicity test, including the control and all effluent dilutions, which fails to meet any of the following criteria:

1) a control mean survival of 80% or greater;

2) a control mean dry weight of surviving mysid shrimp of 0.20 mg or greater;

3) a control mean dry weight for surviving unpreserved inland silverside of 0.50 mg or greater and GA3 mg or greater for surviving preserved inland silverside.

4) a control Coefficient of Variation percent (CV%) between replicates of 40 or less in the in the growth and survival tests.

5) a critical dilution CV% of 40 or less in the growth and survival endpoints for either growth and survival test. However, if statistically significant lethal or nonlethal effects are exhibited at the critical dilution, a CV% greater than 40 shall not-invalidate the test.

6) a PMSD range of 11 - 37 for mysid shrimp growth;

7) a PMSD range of 11 -28 for inland silverside growth.

b.

Statistical Interpretation I)

For the mysid shrimp and the inland silverside larval survival and growth tests, the statistical analyses used to determine if there is a'significant difference between the control and an effluent dilution shall be in accordance with the methods described in the "Short-Term Methods forEstimating the Chronic Toxicity of Effluents and Receiving Waters to Marine and Estuarine

• Organisms, Third Edition' (EPA-821-R-02-0 14), or the most recent update thereof.

2)

The pernittee is responsible for reviewing test concentration-response relationships to ensure that calculated test-results are interpreted and reported correctly. The EPA manual, "Method Guidance and Recommendation for Whole Effluent Toxicity (WETI) Testing (40 CFR Part 136)" (EPA 821-B-00-004) provides guidance on determining the validity of test results.

3)

If significant lethality is demonstrated (that is, there is a statistically significant difference in survival at the critical dilution when compared to the control), the conditions of test acceptability are met, and the survival of the test organisms are equal to or greater than 80% in the critical dilution and all dilutions below that, then the permittee shall report a survival No Observed Effect Concentration (NOEC) of not less than the critical dilution for the reporting requirements.

4)

The NOEC is defined as the greatest effluent dilution at which no significant effect is demonstrated. The Lowest Observed Effect Concentration (LOEC) is defined as the lowest effluent dilution at which a significant effect is demonstrated. A significant effect is herein defined as a statistically significantdifference atthe 95% confidence levelbetween the survival, reproduction, or growth of the test organism(s) in a specified effluent dilution compared to the survival, reproduction, or growth of the test organism(s) in the control (0% effluent).

5)

The use of NOECs and LOECs assumes either a monotonic (continuous) concentration-response relationship or a threshold model of the concentration-response relationship. For any test result that demonstrates a non-monotonic (non-continuous) response, the NOEC should be determined based on the guidance manual referenced in Item 3 above and'a full report will be submitted to the Water Quality Standards Team

6)

Pursuant to the responsibility assigned to the permittee in Part 2.b.2), test results that demonstrate a non-monotonic (non-continuous) concentration-response relationship may be submitted, prior to the due date, for technical review. The above-referenced guidance manual will be used when making a determination of test acceptability Page 18

STP Nuclear Operating Company TPDES Permit No. WQ0001908000

7)

The Water Quality Standards Team will review test results (i.e., Table 1 and Table 2 forms) for consistency with established TCEQ rules, procedures, and permit requirements.

c.

Dilution Water

1)

Dilution water used in the toxicity tests shall be the receiving water collected as close as possible to the discharge point, but unaffected by the discharge.

2)

Wherethe receiving waterproves unsatisfactory as a result ofpre-existing instream toxicity (i.e.

fails to fulfill the test acceptance criteria of item 2.a.), the permittee may substitute synthetic dilution water for the receiving water in all subsequent tests provided the unacceptable receiving water test met the following stipulations:

a) -a synthetic lab water control was performed (in addition to the receiving water control) which fulfilled the test acceptance requirements of item 2.a; b) the test indicating receiving water toxicity was carried out to completion (i.e., 7 days);

c) the perrnittee submitted all test results indicating receiving water toxicity with the reports and information required in Part 3.

Upon approval, the permittee may substitute other appropriate dilution water with chemical and physical characteristics similar to that of the receiving water.

d.

Samples and C6mposites

1)

Thepermittee shall collect aminimum ofthree flow-weighted 24-hour composite samples from Outfall 001. The second and third 24-hour composite samples will be used for the renewal of the dilution concentrations for each toxicity test. A 24-hour composite sample consists of a minimum of 12 effluent portions collected at equal time intervals representative of a 24-hour operating day and combined proportionally to flow, or a sample continuously collected proportionally to flow over a 24-hour operating day.

2)

The permittee shall collect the 24-hour composite samples such that the samples are representative of any periodic episode of chl orinatioon, biocide usage, or other potentially toxic substance discharged on an intermittent basis.

3)

The permittee shall initiate the toxicity tests within 36 hours4.166667e-4 days <br />0.01 hours <br />5.952381e-5 weeks <br />1.3698e-5 months <br /> afer collection of the last portion ofthe first 24-hour composite sample. The holding time for any-subsequent 24-hour composite sample shall not exceed 72 hours8.333333e-4 days <br />0.02 hours <br />1.190476e-4 weeks <br />2.7396e-5 months <br />. Sarples shall be maintained at a temperature of 0-6 degrees Centigrade during collection, shipping, and storage.

4)

If flow from the outfall being tested ceases during the collection of effluent samples, the requirements for the minimum number of effluent samples, the riiniimum number of effluent portions, and the sample holding time, are waived during that sampling period. However, the permittee must have collected an effluent composite sample volume sufficient to complete the required toxicity tests with daily reewal of the effluent. When possible, the effluent samples used for the toxicity tests shall be collected on separate days if the discharge occurs over multiple days. The effluent composite sample collection duration and the static renewal protocol associated with the abbreviated sample collection must be documented in the full report required in Part 3 of this Section. -

3'.

Reportin::

All reports, tables, plans, summaries, and related correspondence required in any Part of this Section shall be submitted to the attention of the Water Quality Standards Team (MC 150) of the Water Quality Division.

All DMRs, including DMRs with biomonitoring data, should be sent to the Water Quality Compliance Monitoring Team of the Enforcement Division (MC 224).

a.

The permittee shall prepare a full report of the results of all tests conducted pursuant to this permit in accordance with the Report Preparation Section of "Short-Terin Methods for Estimating the Chronic Toxicity of Effluents and ReceivingWaters to Marine and Estuarine Organisms, Third Edition" (EPA-Page 19

STP Nuclear Operating Company TPDES Permit No. WQ0001908000 821-R-02-014), or the most recent update thereof, for every valid and invalid toxicity test initiated whether carried to completion or not. All full reports shall be retained for 3 years at the plant site and shall be available for inspection by TCEQ personnel.

b.

A full report must be submitted with the first valid biomonitoring test results for each test species and with the first test results any time the permittee subsequently employs a different test laboratory. Full reports need not be submitted for subsequent testing unless specifically requested. The permittee shall routinely report the results of each biomonitoring test on the Table I forms provided with this permit.

All Table I reports must include the information specified in the Table 1 form attached to this permit.

1)

Annual biomonitoring test results are due on or before January 20th for biomonitoring conducted during the previous 12 month period.

2)

Semiannual biomonitoring test results are due on or before July 20th and January 20th for biomonitoring conducted during the previous 6 month period.

3)

Quarterly bionionitoring test results are due on or before April 20th, July 20th, October 20th, and January 20th, for biomonitoring conducted during the previous calendar quarter.

4)

Monthly biomonitoring test results are due on or before the 20th day of the month following sampling.

c.

Enter the following codes on the DMR for the appropriate parameters for valid tests only:

1)

For the mysid shrimp, Parameter TLP3E, enter a " 1" if the NOEC for survival is less than the critical dilution; otherwise, enter a "0."

2)

For the mysid shrimp, Parameter TOP3E, report the NOEC for survival.

3)

For the mysid shrimp, Parameter TXP3E, report the LOEC for survival.

4)

For the mysid shrimp, Parameter TWP3E, enter a "I" if the NOEC for growth is less than the critical dilution; otherwise, enter a "0."

5)

For the mysid shrimp, Parameter TPP3E, report the NOEC for growth.

6)

For the mysid shrimp, Parameter TYP3E, report the LOEC for growth.

7)

For the inland silverside, Parameter TLP6B,enter a " I " if the NOEC for survival is less than the critical dilution; otherwise, enter a "O."

8)

For the inland silverside, Parameter TOP6B, report the NOEC for survival.

9)

For the inland silverside, Parameter TXP6B, report the LOEC for survival.

10)

For the inland silverside, Parameter TWP6B,enter a " I " if the NOEC for growth is less than the critical dilution; otherwise, enter a "0."

11)

For the inland silverside, Parameter TPP6B, report the NOEC for growth.

12)

For the inland silverside, Parameter TYP6B, report the LOEC for growth

d.

Enter the following codes on the DMR for retests only:

1)

For retest number 1, Parameter 22415, enter a "1". if the NOEC for survival is less than the critical dilution; otherwise, enter a "0."

2)

For retest number 2, Parameter 22416, enter a "I" if the NOEC for survival is less than the critical dilution; otherwise, enter a "0."

Page 20

STP Nuclear Operating Company TPDES Permit No. WQ0001908000

4.

Persistent Toxicitv The requirements of this Part apply only when a test demonstrates'a significant effect at the critical dilution.

A significant effect is defined as a statistically significant difference, at the 95% confidence level, between a specified endpoint (survival, growth, or reproduction) of the test organism in a specified effluent dilution when compared to the specified endpoint of the test organism in the control. Significant lethality is defined as a statistically significant difference in survival at the critical dilution when compared to the survival of the

test organism in the control. Significant sublethality is defined as a statistically significant difference in growthIreproduction at the critical dilution when compared to the growth/reproduction of the test organism in the control.

a.

The permittee shall conduct a total of 2 additional tests (retests) for any species that demonstrates a significant effect (lethal or sublethal) at the critical dilution.'The two'retests shall be conducted monthly during the next two consecutive months. 'The permittee shall not substitute either of the two retests in lieu of routine toxicity'testing. All reports shall be submitted Withiri 20 days of test completion. Test completion is defined as the last day of the test. The retests shall also be reported on the DMRs as specified in Part 3.d.

b.

If the retests are performed due to a demonstration of significant lethality, and one br both of the two retests specified in item 4.a. demonstrates significant lethality, the permittee shall initiate the TRE requirements as specified in Part 5. The provisions of item 4.a. are suspended upon completion of the two retests and submittal of the TRE Action Plan and Schedule defined in Part 5.

If neither test demonstrates significant lethality and the permittee is testing under the reduced testing frequency provision of Part L.e., the permittee shall return to a quarterly testing frequency. for that species.

c.

If the two retests are performed due to a demonstration of significant sublethality, and one or both of the two retests specified in item 4.a. demonstrates'significant lethality, the permittee shall again perform two retests as stipulated in item 4.a.

d.

If the.two retests are performed due to a demonstration of significant sublethality, and both retests pass, the permittee'shall continue testing at the'quarterly frequency until such time that the permittee.

can invoke the reduced testing frequency provision specified in Part L.e.

e.

Regardless of whether retesting for lethal or sublethal'effects, or a combination of the two, no more than one retest per month is required for a species.

5.

Toxicity Reduction Evaluation

a.

Within 45 days of the last test day of the retest that demonstrates significant lethality, the permittee shall submit a General Outline for initiating a TRE. The outline shall include, but not be limited to, a description of project personnel, a schedule for obtaining consultants (if needed), a discussion of influent and/or effluent data available forreview, a sampling and analytical schedule, and a proposed TRE initiation date.'

b.

Within 90 days of the last test day of the retest that demonstrates significant lethality, the permittee shall submit a TRE Action Plan and Schedule for conducting a TRE. The'plan shall specify the approach and methodology to be used in performing the TRE. A Toxicity Reduction Evaluation is a step-wise investigation combining toxicity testing with physical and chemical analysis to determine actions necessary to eliminate or reduce effluent toxicity to a level not effecting significant lethality at the critical dilution. The TRE Action Plan shall lead to the successful 'elimination of significant lethal effects at the critical dilution for both test species defined in item' 1iIb. As a minimum, the TSE Action Plan shall include the following:

- I) -Specific Activities - The TRE Action Plan shall specify the approach the permittee intends to

-uilize in conducting the TRE,: including -toxicity characterizations, identifications,

- confirmations, source evaluations, treatability studies, andloi alternative approaches. When conducting characterization analyses,thepermitiec shall performi multiplecharacterizations and follow the procedures specified in the document entitled, "Toxicity Identification Evaluation:

Characterization of Chronically Toxic Effluent, Phase I" (EPA/600/6-91/005F), or alternate procedures. The permittee shall perform'multiple identifications and follow the methods Page 21

STP Nuclear Operating Company TPDES Permit No. WQ000 1908000 specified in the documents entitled, "Methods for Aquatic Toxicity Identification Evaluations, Phase II Toxicity Identification Procedures for Samples Exhibiting Acute and Chronic Toxicity" (EPA/600/R-92/080) and "Methods for Aquatic Toxicity Identification Evaluations, Phase HI Toxicity Confirmation Procedures for Samples Exhibiting Acute and Chronic Toxicity" (EPAI600(R-92/0 1). All characterization, identification, and confirmation tests shall be conducted in an orderly and logical progression;

2)

Sampling Plan - The TRE Action Plan should describe sampling locations, methods, holding times, chain of custody, and preservation techniques. The effluent sample volume collected for all tests shall be adequate to perform the toxicity characterization/ identification! confirmation procedures, and chemical-specific analyses when the toxicity tests show significant lethality.

Where the permittee has identified or suspects specific pollutant(s) and/or source(s) of effluent toxicity, the permittee shall conduct, concurrent with toxicity testing, chemical-specific analyses for the identified and/or suspected pollutant(s) and/or source(s) of effluent toxicity;

3)

Quality Assurance Plan - The TRE Action Plan should address record keeping and data evaluation, calibration and standardization, baseline tests, system blanks, controls, duplicates, splikes, toxicity persistence in the samples, randomization, reference toxicant control charts, as well as-mechanisms to detect artifactual toxicity; and

4)

Project Organization -The TRE Action Plan should describe the project staff, project manager, consulting engineering services (where applicable), consulting analytical and toxicological services, etc.

c.

Within 30 days of submittal of the TRE Action Plan and Schedule, the permittee shall implement the TRE with due diligence.

d.

The permittee shall submit quarterly TRE Activities Reports concerning the progress of the TRE. The quarterly reports are due on or before April 20th, July 20th, October 20th, and January 20th. The report shall detail information regarding the TRE activities including:

.1) results and interpretation of any chemical-specific analyses for the identified and/or suspected pollutant(s) performed during the quarter,

2) results and interpretation of any characterization, identification, and confirmation tests performed during the quarter,

3) any data and/or substantiating documentation which identifies the pollutant(s) and/or source(s) of effluent toxicity;

4) results of any studies/evaluations concerning the treatability of the facility's effluent toxicity;

5) any data which identifies effluent toxicity control mechanisms that will reduce effluent toxicity to the level necessary to meet no significant lethality at the critical dilution; and

6) any changes to the initial TRE Plan and Schedule that are believed necessary as a result of the TRE findings.

Copies of the TRE Activities Report shall also be submitted to the U.S. EPA Region 6 office.

e.

During the TRE, the perminttee shall perform, at a minimum, quarterly testing using the more sensitive species; testing for the less sensitive species shall continue at the frequency specified in Part I.b.-

f.

If the effluent ceases to effect significant lethality (herein as defined below) the permittee may end the TRE. A "cessation of lethality" is defined as no significant lethality for a period of 12 consecutive months with at least monthly testing. At the end of the 12 months, the permittee shall submit a statement of intent to cease the TRE and may then resume the testing frequency specified in Part I.b.

The permittee may only apply the "cessation of lethality" provision once.

This provision accommodate situations where operational errors and upsets, spills, or sampling errors triggered the TRE, in contrast to a situation where a single toxicant or group of toxicants cause Page 22

STP Nuclear Operating Company rTPDES Permit No. WQOOO1 908000 lethality. This provision does not apply as a result of corrective actions taken by the permnittee.

"Corrective actions" are herein defined asproactive efforts whicheliminate or reduce effluent toxicity.

These include, but are not limnitedto, sourcereduction or elimination, improved housekeeping, changes in chemical usage, and modifications of influent streams and/or effluent treatment.

The permittee may only apply this cessation of lethality provision-once.,If the effluent again demonstrates significant lethality to the same species, the permit will be amended to add a WET limit with a compliance period, if appropriate. However, prior to the effective date of the WET limit, the permittee may apply for a permit amendment removing and replacing the WET limit with an alternate toxicity control measure by identifying and confirming the toxicant and/or an appropriate control measure.

g.

The permittee shall complete the TRE and submit a Final Report on the TRE Activities no later than 28 months from the last test day of the-retest that confirmed significant lethal effects at the critical dilution. The pernittee may petition the Executive Director (in writing) for an extension of the 28-month limit. However, to warrant an extension the permittee must have demonstrated due diligence

-in their pursuit of the TIE/TRE and must prove that circumstances beyond their control stalled the TIE/iRE. The report shall provide information pertaining to the specific control mechanism(s) selectedthat will, when implementedyresult inreduction of effluent toxicity to no significantlethality at the critical dilution. The report will.also provide a specific corrective action schedule for implementing the selected control mechanism(s). A copy of the TRE Final Report shall also be

-submitted to the U.S. EPA Region 6 office.'

h.

Based upon the results of the TRE and proposed corrective actions, this permit may be amended to modify the biomonitoring requirements, where necessary, to require a compliance schedule for implementation of corrective actions, to specify a WET limit, to specify a BMP, and/or to specify CS limits.

Page 23

L ^L STP Nuclear Operating Company TPDES Permit No. WQ0001908000 TABLE I (SHEET I OF 4)

MYSID SHRIMP SURVIVAL AND GROWTH Dates and Times Composites Collected Date Time No. I FROM:

No. 2 FROM:-

Date Time TO:

TO:

TO:

No. 3 FROM:_

Test initiated:

am/pm date Dilution water used:

Receiving water Synthetic Dilution water MYSID SHRIMP SURVIVAL siF vi-P M~*--11L k2 M

able MEMAMl L __

L _ _ _

L__

=

1 deit

=

_eL

• coefficient of variation =standard deviation x 100/mean Page 24

STP Nuclear Operating Company TPDES Permit No. WQ0001908000

• co TABLE I (SHEET 2 OF 4)

MYSID SHkIMP SURVIVAL AND GROWTH DATA TABLE FOR GROWTH OF MYSID) SHRTM? (Continued')

gte.

-i....:..

X

==-

4-..X t

I

._._.'_I_

Acceptable Range_11-37

._l_.

efficient of variation standard deviation x 100/mxean

1.

Dunnett's Procedure or Steel's Many-One Rank Test or Wilcoxon Rank Sum Test (with Bonferroni adjustment) or t-test (with Bonferroni adjustment)- as appropriate:

Is the mean survival at 7 days significantly less (p-.05) than the control survival for the % effluent corresponding to lethality?

CRMTICAL DILUTION (13%):

YES NO 2..

Dunnett's Procedure or Steel's Many-One Rank Test or Wilcoxon Rank Sum Test (with Bonferroni adjustment) or t-test (with Bonferroni adjustment) as appropriate:

Is the mean dry weight (growth) at 7 days significantly less (p=0.05) than the control's dry weight (growth) for the % effluent corresponding to non-lethal effects?

CRMTICAL DILUTION (13%):

YES NO

3.

Enter percent effluent corresponding to each NOEC/LOEC below:

a.) NOEC survival =

% effluent b.) LOEC survival =

% effluent c.) NOEC growth

=

% effluent d.) LOEC growth

=

% effluent Page 25

STP Nuclear Operating Company TPDES Permit No. WQ0001908000 TABLE I (SHEET 3 OF 4)

INLAND SELVERSIDE LARVAL SURVIVAL AND GROWTH TEST Date Time Date Time Dates and Times No. I FROM:

TO:

Composites Collected No. 2 FROM:

TO:

No. 3 FROM::

TO:

Test initiated:

am/pm date Dilution water used:

Receiving water Synthetic Dilution water

• coefficient of variation = standard deviation x 100/mean Page 26

STP Nuclear Operating Company TPDES Permnit No. WQOO 1 908000 TABLE 1 (SHEET 4 OF 4)

ITLAND SILVERSIDE LARVAL SURVIVAL AND GROWTH TEST INLAND SILVERSIDE GROWTH Q Oikh

'3-

'if.d,1-

\\W-Ah.'

-,.nl

=ne 1

=v if 4;17 Weights are for.

pesevdlave r

nrsevdlrve aoefii un o vriantion testandardhdeviation x1/niadjsmntasproite Is the mean survival at 7 days significantly less (p=-0.05) than the control survival for the % effluent corresponding to lethality?

r-r:'.

CRITICAL DILUTION (13%/):

-YES NO

2.

Dunnett's Procedure or Steel's Many-~ne Rank Test or WVil~coxon Rank Sum Test (with Bonferroni adjustment) or M-est (with Bonferroni adjustment) as appropriate:

I

,Is the mean dry~weight (growth) at 7 days significantly less (p=-0.05) than the control's dry weight (growth) for the % effluent corresponding to -non-lethal effects?,

~

.I CkITICAL DILUTION (13%O/): -

YES NO L.I~,

.;IL

3.

Enter percent effluent corresponding to each NOEC/LOEC below:

a.) NOEC survival =

% effluent b.) LOEC survival =

% effluent c.) NOEC growth =

% effluent d.) LOEC growth =

ea%

effluentl Page 27

_~

I.L STP Nuclear Operating Company TPDES Permit No. WQ00 1908000 24-HOUR ACUTE BIOMONiTORING REOUIREMENTS: MARINE The provisions of this Section apply individually and separately to Outfall 001 for whole effluent toxicity testing (biomonitoring). No samples or portions of samples from one outfall maybe composited with samples or portions of samples from another outfall.

1.

Scope, Frequency and Methodology

a.

The permittee shall test the effluent for lethality in accordance with the provisions in this Section.

Such testing will determine compliance with the Surface Water Quality Standard, 30 TAC

§307.6(e)(2)(B), of greater than 50% survival of the appropriate test organisms in 100% effluent for a 24-hour period.

b.

The toxicity tests specified shall be conducted once per six months. The permittee shall conduct the following toxicity tests utilizing the test organisms, procedures, and quality assurance requirements specified in this section of the permit and in accordance with "Methods for Measuring the Acute Toxicity of Effluents and Receiving Waters to Freshwater and Marine Organisms, Fifth Edition' (EPA-821-R-02-012), or the most recent update thereof:

I)

Acute 24-hour static toxicity test using the mysid shrimp (Mysidopsis bahia). A minimum of five replicates with eight organisms per replicate shall be used in the control and in each dilution.

2)

Acute 24-hour static toxicity test using the inland silverside (Menidia beryllina). A minimum of five replicates with eight organisms per replicate shall be used in the control and in each dilution.

The permittee must perform and report a valid test for each test species during the prescribed reporting period. An invalid test must be repeated during the same reporting period. An invalid test is herein defined as any test failing to satisfy the test acceptability criteria, procedures, and quality assurance requirements specified in the test methods and permit. All test results, valid or invalid, must be submitted as described below.

c.

In addition to an appropriate control, a 100% effluent concentration shall be used in the toxicity tests.

Except as discussed in item 2.b., the control and/or dilution water shall consist of a standard, synthetic, moderately hard, reconstituted water.

d.

This permit may be amended to require a Whole Effluent Toxicity (WET) limit, a Best Management Practice (BMP), a Chemical-Specific (CS) limit, additional toxicity testing, and/or other appropriate actions to address toxicity. The permittee may be required to conduct additional biomonitoring tests and/or a Toxicity Reduction Evaluation (TRE) if biomonitoring data indicate multiple numbers of unconfirmed toxicity events.

e.

If the biomonitoring dilution series specified in the Chronic biomonitoring requirements includes a 100% effluent concentration, those results may fulfill the requirements of this Section. The results of any test with a 1 00% effluent concentration performed in the proper time interval may be substituted in lieu of performing a separate 24-hour acute test. Compliance will be evaluated as specified in item

a. The greater than 50% survival in 100% effluent for a 24-hour period standard applies to all tests utilizing a 1 00% effluent dilution, regardless of whether the results are submitted to comply with the minimum testing frequency defined in item b.

2.

Required Toxicity Testing Conditions

a.

Test Acceptance -The permittee shall repeat any toxicity test, including the control, if the control fails to meet a mean survival equal to or greater than 90%.

b.

Dilution Water - In accordance with item I.c., the control and/or dilution water shall normally consist of a standard, synthetic, reconstituted seawater. If the permittee is utilizing the results of a 48-Hour Acute test or a Chronic test to satisfy the requirements in item l.e., the permittee may use the receiving Page 28

^

STP Nuclear Operating Company rTPDES Permit No. WQ0001 908000 water or dilution water that meets the requirements of item 2.a. as the control and dilution water.

c.

Samples and Composites

1)

The permittee shallicollect one flow-weighted 24-hour composite sample from Outfall 001. A 24-hourcomposite sample consists of aminimum of 12 effluent portions collected at equal time intervals representative of a 24-hour operating day and combined proportional to flow, or a sample continuously collected proportional to flow over a 24-hour operating day.

2).

The permittee shall collect the 24-hour composite samples such that the samples are representative of anyperiodic episode of chlorination, biocide usage, or otherpotentially toxic substance discharged on an intermittent basis.

3)

The permittee shall initiate the toxicity tests within 36 hours4.166667e-4 days <br />0.01 hours <br />5.952381e-5 weeks <br />1.3698e-5 months <br /> after collection of the last portion of the 24-hour composite sample. Samples shall be maintained at a temperature of 0-6 degrees Centigrade during collection, shipping, and storage.

4)

If the Outfall ceases discharging during the collection of the effluent composite sample, the requirements for the minimum number of effluent portions are waived. However, the permittee must have collected a composite sample volume sufficient for completion of the required test.

The abbreviated sample collection, duration, and methodology must be documented in the full report required in Part 3 of this Section.

3.

Reporting All reports, tables, plans, summaries, and related correspondence required in any Part of this Section shall be submitted to the attention of the Water Quality Standards Team (MC 150) ofthe Water QualityDivision.

All DMRs, including DMRs with biomonitoring data, should be sent to the Water Quality Compliance Monitoring Team of the Enforcement Division (MC 224).

a.

The permittee shall prepare a full report of the results of all tests conducted pursuant to this permit in accordance with the Report Preparation Section of "Methods for Measuring the Acute Toxicity of Effluents and Receiving Waters to Freshwater and Marine Organisms, Fifth Edition" (EPA-82 1 -R 012), or the most recent update thereof, for every valid and invalid toxicity test initiated. All full reports shall be retained for three years at the plant site and shall be available for inspection by TCEQ personnel.

b.

A full report mustbe submitted with the first valid biomonitoring test results for each test species and with the first test results any time the permnittee subsequently employs a different test laboratory. Full reports need notbe submitted for subsequent testing unless specificallyrequested. The permittee shall.

routinely report the results of each biomonitoring test on the Table 2 forms provided with this permit.

All Table 2 reports must include the information specified in the Table 2 form attached to this permit.

1).

Semiannual biomonitoring test results are due on or before January 20th and July 20th for biomonitoring conducted during the previous 6 month period.

2)

Quarterly biomonitoring test results are due on orbefore January 20th, April 20th, July 20th, and October 20th, for biomonitoring conducted during the previous calendar quarter.

c.

Enter the following codes on the DMR for the appropriate parameters for valid tests only:

1)

For the mysid shrimp, Parameter TIE3E, enter a "0" if the mean survival at 24-hours is greater than 50% in the 100% effluent dilution; if the mean survival is less than or equal to 50%, enter a 1l."

2)

For the inland silverside, Parameter TIE6B, enter a "0" if the mean survival at 24-hours is greater than 50% in the 100% effluent dilution; if the mean survival is less than or equal to 50%, enter a "1."

Page 29

l I -

A STP Nuclear Operating Company TPDES Permit No. WQOOO 1908000

d.

Enter the following codes on the DMR for retests only:

1)

For retest number 1, Parameter 22415, enter a "0" if the mean survival at 24-hours is greater than 50% in the 100% effluent dilution; if the mean survival is less than or equal to 50%, enter a 1"

2)

For retest number 2, Parameter 22416, enter a "0" if the mean survival at 24-hours is greater than 50% in the 100% effluent dilution; if the mean survival is less than or equal to 50%, enter a "1."

4.

Persistent Mortalitv The requirements of this Part apply when a toxicity test demonstrates significant lethality, here defined as a mean mortality of 50% or greater to organisms exposed to the 100% effluent concentration after 24-hours.

a.

Thepermittee shall conduct two additional tests (retests) foreach species that demonstrates significant lethality. The two retests shall be conducted once per week for two weeks. Five effluent dilution concentrations in addition to an appropriate control shall be used in the retests. These additional effluent concentrations shall be 6%, 13%, 25%, 50% and 100% effluent. The first retest shall be conducted within 15 days of the laboratory determination of significant lethality. All test results shall be submitted within 20 days of test completion of the second retest. Test completion is defined as the 24th hour. The retests shall also be reported on the DMIRs as specified in Part 3.d.

b.

If one or both of the two retests specified in item 4.a. demonstrates significant lethality, the permittee shall initiate the TRE requirements as specified in Part 5 of this Section.

5.

Toxicitv Reduction Evaluation

a.

Within45 days ofthe retestthatdemonstrates significantlethality, thepermittee shall submit a General Outline for initiating a TRE. The outline shall include, but not be limited to, a description of project personnel, a schedulefor obtaining consultants (ifneeded), a discussion of influent and/or effluent data available for review, a sampling and analytical schedule, and a proposed TRE initiation date.

b.

Within 90 days of the retest that demonstrates significant lethality, the permittee shall submit a TRE Action Plan and Schedule for conducting a TRE. The plan shall specify the approach and methodology to be used in performing the TRE. A Toxicity Reduction Evaluation is a step-wise investigation combining toxicity testing with physical and chemical analysis to determine actions necessary to eliminate or reduce effluent toxicity to a level not effecting significant lethality at the critical dilution. The TRE Action Plan shall lead to the successful elimination of significant lethality for both test species defined in item I.b. As a minimum, the TRE Action Plan shall include the following:

1)

Specific Activities - The TRE Action Plan shall specify the approach the permittee intends to utilize in conducting the TRE, including toxicity characterizations, identifications, confirmations, source evaluations, treatability studies, and/or alternative approaches. When conductingcharacterization analyses, thepermittee shall performmultiple characterizations and follow the procedures specified in the document entitled, "Methods for Aquatic Toxicity Identification Evaluations: PhaselToxicity Characterization Procedures" (EPA/600/6-91/003),

or alternate procedures. The permittee shall perform multiple identifications and follow the methods specified in the documents entitled, "Methods for Aquatic Toxicity Identification Evaluations, Phase II Toxicity Identification Procedures for Samples Exhibiting Acute and Chronic Toxicity" (EPA/6001R-92/080) and "Methods for Aquatic Toxicity Identification Evaluations, Phase 111 Toxicity Confirmation Procedures for Samples Exhibiting Acute and Chronic Toxicity" (EPA/600/R-92/081). All characterization, identification, and confirmation tests shall be conducted in an orderly and logical progression;

2)

Sampling Plan - The TRE Action Plan should describe sampling locations, methods, holding times, chain of custody, and preservation techniques. The effluent sample volume collected for all tests shall be adequate to perform the toxicity characterization/ identification/ confirmation Page 30

STP Nuclear Operating Company TPDES Permit No. WQOOQ1908000 procedures, and chemical-specific analyses when the toxicity tests show significant lethality.

Where the permittee has identified or suspects specific pollutant(s) and/or source(s) of effluent toxicity, the permittee shall conduct, concurrent with toxicity testing, chemical-specific analyses for the identified andlor suspected pollutant(s) and/or source(s) of effluent toxicity;

3)

Quality Assurance Plan - The TRE Action Plan should address record keeping and data

-evaluation, calibration and standaTdization,baselinetests,'systemblanks', controls, duplicates, spikes, toxicity persistence in the samrples;randomization, reference toxicant control charts, as well as mechanisms to detect artifactual toxicity;' ahd

4)

Project Organization -The TRE ActionPlan should descnbe the project staff, project manager,

-consulting engineering services (where applicable), consulting analytical and toxicological services, etc.

c.

Within 30 days of submittal of the TRE Action Plan and Schedule, the permittee shall implement the TRE with due diligence.

d.

The permittee shall submit quarterly TRE Activities Repoits concerning the progress ofthe TRE. The quarterly TRE Activities Reports are due on orbefore April 20th, July 20th, October 20th, and January 20th. The report shall detail information regarding the TRE activities including:

1) results and interpretation of-any chemical-specific analyses for the identified and/or suspected pollutant(s) performed during the quarter;

2) results and interpretation of any'characterization, identification, and confurmation tests performed during the quarter;

3) any data and/or substantiating documentation which identifies the pollutant(s) and/or source(s) of effluent toxicity;

4) results of any studies/evaluations concerning the treatability of the facility's effluent toxicity;

5) any data which identifies effluent toxicity control mechanisms that will reduce effluent toxicity to the level necessary to eliminate significant lethality; and

6) any changes to the initial TRE Plan and Schedule that are believed necessary as a result of the TRE findings.

Copies of the TRE Activities Report shall also be submitted to the U.S. EPA Region 6 office.

e.

During the TRE, the permittee shall perform, at a minimum, quarterly testing using the more sensitive species; testing for the less sensitive species shall continue at the frequency specified in Part 1.b.

f.

If the effluent ceases to effect significant lethality (herein as defined below) the permittee may end the TRE. A "cessation of lethality" is defined as no significant lethality for a period of 12 consecutive weeks with at least weekly testing. At the end of the 12 weeks, the permittee shall submit a statement of intent to cease the TRE and may then resume the testing frequency specified in Part 1 b. The permittee may only apply the 'cessation of lethality" provision once.

This provision accommodate situations where operational errors and upsets, spills, or sampling errors triggered the TRE, in contrast to a situation where a single toxicant or group of toxicants cause lethality. This provision does not apply as a result of corrective actions taken by the permittee.

"Corrective actions" areherein defined asproactive efforts which eliminate orreduce effluenttoxicity.

These include, but arenot limited to, source reduction or elimination, improvedhousekeeping, changes in chemical usage, and modifications of influent streams and/or effluent treatment.

The permittee may only apply this cessation of lethality provision once. If the effluent again demonstrates significant lethality to the same species, the permit will be amended to add a WET limit with a compliance period, if appropriate. However, prior to the effective date of the WET limit, the Page 31

STP Nuclear Operating Company TPDES Permit No. WQOOO 1908000 permittee may apply for a permit amendment removing and replacing the WET limit with an alternate toxicity control measure by identifying and confirming the toxicant and/or an appropriate control measure.

g.

The permittee shall complete the TRE and submit a Final Report on the TRE Activities no later than 18 months from the last test day of the retest that demonstrates significant lethality. The permittee may petition the Executive Director (in writing) for an extension of the 1 8-month limit. However, to warrant an extension the permittee must have demonstrated due diligence in their pursuit of the TEE/RE and must prove that circumstances beyond their control stalled the TIE/TRE. The report shall specify the control mechanism(s) that will, when implemented, reduce effluent toxicity as specified in item 5.g. The report will also specify a corrective action schedule for implementing the selected control mechanism(s). A copy of the TRE Final Report shall also be submitted to the U.S.

EPA Region 6 office.

h.

Within 3 years of the last day of the test confirming toxicity, the permittee shall comply with 30 TAC 307.6.(e)(2)(B), which requires greater than 50% survival of the test organism in 100% effluent at the end of 24-hours. The permittee may petition the Executive Director (in writing) for an extension of the 3-year limit. However, to warrant an extension the permittee must have demonstrated due diligence in their pursuit of the TIE/RE and must prove that circumstances beyond their control stalled the TIIETRE.

The requirement to comply with 30 TAC 307.6.(e)(2)(B) may be exempted upon proof that toxicity is causedbyan excess,imbalance, or deficiency of dissolved salts. This exemption excludes instances where individually toxic components (e.g. metals) form a salt compound. Following the exemption, the permit may be amended to include an ion-adjustment protocol, alternate species testing, or single species testing.

i.

Based upon the results of the TRE and proposed-corrective actions, this permit may be amended to modify the biomonitoring requirements where necessary, to require a compliance schedule for implementation of corrective actions, to specify a WET limit, to specify a BMP, and/or to specify a CS limit.

Page 32

R S,TP Nuclear Operating Company TPDES Permit No. WQ000 1908000 TABLE 2 (SHEET I OF 2)

MYSID SHRkMP SURVIVAL GENERAL INFORMATION

'PERCENT SURVIVAL

_h

,=.

Metho of C50 clcultion h

6-

~-1 24 ou LCO fflen 95% cofieceli Mm________

Method ofL5 cluaio:______

Page 33

l l

STP Nuclear Operating Company TPDES Permit No. WQ0001908000 TABLE 2 (SHEET 2 OF 2)

INLAND SILVERSIDE SURVIVAL GENERAL INFORMATION PERCENT SURVIVAL 1.

Enter percent effluent corresponding to the LC50 below:

24-hour LC50 =

% effluent 95% confidence limits:

Method of LC50 calculation:

Page 34