ML15119A220

Renewal of the Wastewater Discharge Permit

ML15119A220
Person / Time
Site:	South Texas
Issue date:	04/17/2015
From:	Marc-Anthony Murray South Texas
To:	Document Control Desk, Office of Nuclear Reactor Regulation
References
G24.02, NOC-AE-15003248, STI: 34105338
Download: ML15119A220 (55)

Text

Nuclear Operating Company South Texas Proect Electric GeneratinS Station PO. Box 289 Wadsworth, Texas 77483 -

April 17, 2015 NOC-AE-1 5003248 File No.: G24.02 10CFR50 U.S. Nuclear Regulatory Commission Attention: Document Control Desk Washington, DC 20555-0001 South Texas Project Units 1 and 2 Docket Nos. STN 50-498 and STN 50-499 Renewal of the Wastewater Dischar-ge 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) as amended from the Texas Commission on Environmental Quality. Appendix B requires that renewed permits be reported to the NRC within 30 days following approval.

Changes made to the renewed permit include additional effluent limitations and monitoring requirements associated with discharges from the Main Cooling Reservoir (MCR), reinstatement of pH limits on domestic wastewater discharges to the MCR, additional limits for metal cleaning waste effluent discharges to the MCR, modification of effluent limitations and streamlining of requirements associated with MCR relief well discharges, and other updates to be consistent with current federal rules and Texas Commission on Environmental Quality policies and practices.

There are no commitments in this letter.

If you should have any questions on this matter, please contact John Hoffman at (361) 972-4507.

/

Michael P. Murray Manager, Regulatory Affairs MK/

Attachment:

Renewed Permit to Discharge Wastes 3ooV STI: 34105338

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NOC-AE-1 5003248 Page 2 of 2 cc:

(paper copy)

(electronic copy)

Regional Administrator, Region IV U.S. Nuclear Regulatory Commission 1600 East Lamar Boulevard Arlington, TX 76011-4511 Lisa M. Regner Senior Project Manager U.S. Nuclear Regulatory Commission One White Flint North (08H04) 11555 Rockville Pike Rockville, MD 20852 NRC Resident Inspector U. S. Nuclear Regulatory Commission P. 0. Box 289, Mail Code: MNl 16 Wadsworth, TX 77483 Morgan, Lewis & Bockius LLP Steve Frantz, Esquire U.S. Nuclear Regulatory Commission Lisa M. Regner NRG South Texas LP John Ragan Chris O'Hara Jim von Suskil CPS Energy Kevin Polio Cris Eugster L. D. Blaylock Crain Caton & James, P.C.

Peter Nemeth City of Austin Cheryl Mele John Wester Texas Dept. of State Health Services Richard A. Ratliff Robert Free

Attachment NOC-AE-1 5003248 TPDES PERMIT NO. WQooo:9o8ooo

[For TCEQ office use only -

EPA I.D. No. 7Xoo64947]

TEXAS COMMISSION ON ENVIRONMENTAL QUALITY P.O Box 13o87 This major amendment replaces Austn, Txas 87n-o87TPDES Permit No.

Austin, Texas 78711-3087 WQoool9o8ooo, issued on PERMIT TO DISCHARGE WASTES April 5,2012.

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.O. Box 289 Wadsworth, Texas 77483 is authorized to treat and discharge wastes from South Texas Project Electric Generating Station (SIC 4911) located at 1209o Farm-to-Market Road 521, approximately 1o miles north of Matagorda Bay and 12 miles south-southwest of the City of Bay City, Wadsworth, in Matagorda County, Texas 77483 via Outfall oo0 directly to the Colorado River Tidal in Segment No. 1401 of the Colorado River Basin; via Outfall 002 to the Plant Area Drainage Ditch (PADD), thence to the Colorado River Tidal in Segment No. 14o1 of the Colorado River Basin; via Outfall 003 to the West Branch of Colorado River, thence to Matagorda Bay/Powderhorn Lake in Segment No. 2451 of the Bays and Estuaries; via Outfall 004 to an unnamed ditch, thence to the Colorado River Tidal in Segment No. 1401 of the Colorado River Basin; via Outfall oo5 to East Fork Little Robbins Slough, thence to Robbins Slough, thence to Robbins Lake, thence to Robbins Slough, thence to Crab Lake, thence to Crab Bayou, thence to the Gulf Intracoastal Waterway (GIWW), thence to Matagorda Bay/Powderhorn Lake in Segment No. 2451 of the Bays and Estuaries; and via Outfall oo6 to Little Robbins Slough, thence to an unnamed pond, thence to Robbins Slough, thence to an unnamed lake, thence to Robbins Lake, thence to Robbins Slough, thence to Crab Lake, thence to Crab Bayou, thence to the GIWW, thence to Matagorda Bay/Powderhorn Lake in Segment No. 2451 of the Bays and Estuaries 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.

Attachment NOC-AE-1 5003248 This permit shall expire at midnight on December 1, 2019.

ISSUED DATE: April 7,2015 For the Commission

EFFLUENT LIMITATIONS AND MONITORING REQUIREMENTS Nuiýber ooi

1.

During the period beginning upon the date of permit issuance and lasting through the date of permit expiration, the permittee is authorized to discharge (*1) recirculated cooling water, cooling reservoir blowdown, previously monitored effluents (low volume waste sources, metal cleaning wastes, stormwater, treated domestic wastewater, car wash water, air conditioning condensate, and heating, ventilating, and air conditioning (HVAC) cooling tower blowdown), stormwater, uncontaminated groundwater currently authorized under Texas Pollutant Discharge Elimination System (TPDES) Construction General Permit TXR15oooo (*6), and makeup water from the 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.

Discharge Limitations Minimum Self-Monitoring Requirements Effluent Characteristics Daily Average Daily Maximum Single Grab Report Daily Average and Daily Maximum mg/L mg/L ing/L Measurement Frequency Sample Typ Flow 144 MGD 200 MGD N/A Continuous (*2)

Record Colorado River Flow (*1)

N/A Report, MGD N/A i/day (*2)

Estimate Temperature (*3) 950F 97OF 97OF Continuous (*2)

In-Situ Total Residual Chlorine (*4)

N/A 0.05 0.05 i/week (*2)

Grab (*5)

Enterococci 35 (*7) 104 (*7) 104 (*7) i/month (*2)

Grab

(*')

See Other Requirement No. 3.

(*2)

When discharging.

(*3)

See Other Requirements No. 8 and No. 2o.

(*4)

See Other Requirement No. 4.

(*5)

Samples must be representative of periods of chlorination.

(*6)

See Other Requirement No. 13.

(*7)

Colony-forming units (cfu) or most probable number (MPN) per loo mL.

2.

The pH must be neither less than 6.o standard units nor greater than 9.o standard units and must be monitored i/day (*2) 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 oo0, which is at a point in the blowdown line prior to entering the Colorado River Tidal Page 2 of TPDES Permit No. WQooo19o8ooo STP Nuclear Operating Company

EFFLUENT LIMMTATIONS AND MONITORING REQUIREMENTS Ouffall Number iol During the period beginning upon the date of permit issuance and lasting through the date of permit expiration, the permittee is authorized to discharge low volume waste sources (*1) and previously monitored effluent (metal cleaning waste) subject to the following effluent limitations:

Volume: Flow variable.

Discharge Limitations Minimum Self-Monitoring Requirements Effluent Characteristics Daily Average Daily Maximum Single Grab Report Daily Average and Daily Maximum mg/L mg/L mg/L Measurement Frequency Sample Type Flow Report, MGD Report, MGD N/A i/day Estimate Total Suspended Solids 30 100

.100 i/week Grab (*2)

Oil and Grease 15 20 20 i/week Grab (*2)

(*i)

See Other Requirement No. 9.

(*2)

If more than one source is associated with this particular waste category, for analytes other than pH, grab samples from each source must be analyzed, analytical values must be combined on a flow-weighted basis, and these calculated values must be used to determine the Daily Average for the month. The highest analytical value of all grab samples for the monthly reporting period must be reported as the Daily Maximum. For pH, the minimum and maximum values recorded among all the waste categories must be reported.

2.

The pH must be neither less than 6.o standard units nor greater than 9.o standard units and must be monitored i/week by grab sample (*2).

3.

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

4.

Effluent monitoring samples must be taken at the following location: At Outfall 0l1, where low volume waste sources (*1) commingled with previously monitored effluent are discharged from the neutralization basins prior to mixing with any other waste stream.

z0 00 Q:6 00 Page 2a of TPDBS Permit No. WQoooigo8000 SIT Nuclear Operating Company Q

EFFLUENT LIMITATIONS AND MONITORING REOMEMENTS

i.

During the period beginning upon the date of permit issuance and lasting through the date of permit expiration, the permittee is authorized to discharge low volume waste sources (*1) from the oily waste treatment system and stormwater subject to the following effluent limitations:

Volume: Flow variable.

Discharge Limitations Minimum Self-Monitoring ReqNirements Effluent Characteristics Daily Average Daily Maximum Single Grab Report Daily Average and Daily Maximum mg/L mg/L mg/L Measurement Frequency Sample.Type Flow Report, MGD Report, MGD N/A i/day Estimate Total Suspended Solids 30 1oo 100 i/week Grab Oil and Grease 15 20 20 i/week Grab

(*i)

See Other Requirement No. 9.

2.

The pH must be neither less than 6.0 standard units nor greater than 9.0 standard units and must be monitored i/week by grab sample.

3.

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

4.

Effluent monitoring samples must be taken at the following location: At Outfall 2o0, where low volume waste sources are discharged from the oily waste treatment system prior to mixing with any other waste stream.

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Page 2b of TPDES Permit No. WQoooi9o8ooo STP Nuclear Operating Company

EFFLUENT I=MITATIONS AND MONITORING REQUIREMENTS Outfall Number 401

1.

During the period beginning upon the date of permit issuance and lasting through the date of permit expiration, the permittee is authorized to discharge treated domestic wastewater, car wash water, and air conditioning condensate subject to the following effluent limitations:

Volume: Continuous and flow variable.

Discharge Limitations Minimum Self-Monitoring Requirements Effluent Characteristics Daily Average Daily Maximum Single Grab Report Daily Average and Daily Maximum mg/L mg/L mg/L Measurement Frequency Sample Type Flow Report, MGD Report, MGD N/A i/day Estimate Biochemical Oxygen Demand, 5-day 20 45 45 i/week Grab Total Suspended Solids 20 45 45 i/week Grab

2.

The pH must be neither less than 6.o standard units nor greater than 9.o standard units and must be monitored i/week by grab sample.

3.

The effluent must contain a minimum chlorine residual of i.o mg/L after a detention time of at least 20 minutes (based on peak flow) and must be monitored i/week by grab sample.

4.

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

5.

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

Z0 00 0 6 co3 Page 2C of TPDES Permit No. WQooo19o8ooo STP Nuclear Operating Company

EFFLMT LIMITATIONS AND MONITORING REQUIREMENTS Oufall Number.soi

1.

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

Volume: Intermittent and flow variable.

Discharge Limitations Minimum Self-Monitoring Requirements Effluent Characteristics Daily Average Daily Maximum Single Grab Report Daily Average and Daily Maximum mg/L mg/L mg/L Measurement Frequency Sample Type Flow Report, MGD Report, MGD N/A

/day (*2)stimate Total Suspended Solids 30 100 loo 1/week

(*2)

Grab Oil and Grease 15 20 20 i/week (*2)

Grab Total Iron 1.0 1.0 1.0 i/week (*2)

Grab Total Copper 0.5 1.0 1.0 i/week (*2)

Grab

(*i)

See Other Requirement No. 6.

(*2)

When discharging.

2.

The pH must be neither less than 6.o standard units nor greater than 9.o standard units and must be monitored i/week (*2) by grab sample.

3.

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

4-Effluent monitoring samples must be taken at the following location: At Outfall 5o0, where metal cleaning waste is discharged prior to mixing with any other waste stream.

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0g Page 2d of TPDES Permit No. WQoooigo8ooo SWp Nuclear operating Company 3

EFFLUENT LIMITATIONS AND MONITORING REQUIREMENTS OuffO Number 6ojL

1.

During the period beginning upon the date of permit issuance and lasting through the date of permit expiration, the permittee is authorized to discharge treated domestic wastewater, air conditioning condensate, and HVAC cooling tower blowdown subject to the following effluent limitations:

Volume: Continuous and flow variable.

Discharge Limitations Minimum Self-Monitoring Requirements Effluent Characteristics Daily Average Daily Maximum Single Grab Report Daily Average and Daily Maximum ing/L mg/L mg/L Measurement Frequency Sample Type Flow RepolM MGD Report, MGD N/A i/day Estimate Biochemical Oxygen Demand, 5-day 20 45 45 i/week Grab Total Suspended Solids 20 45 45 i/week Grab

2.

The pH must be neither less than 6.o standard units nor greater than 9.o standard units and must be monitored i/week by grab sample.

3.

The effluent must contain a minimum chlorine residual of 1.o mg/L after a detention time of at least 20 minutes (based on peak flow) and must be monitored i/week by grab sample.

4.

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

5-Effluent monitoring samples must be taken at the following location: At Outfall 6oi, at the point of discharge from the sewage treatment plant (Training Sanitary Waste Treatment Facility) prior to mixing with any other waste stream.

z00 00 Page 2e of TPDES Permit No. WQoooigo8000 SITP Nuclear Operating Company

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EFFLUENT LUM1TATIONS AND MONITORING REQUIREMENTS Outfall Number 002 L,

During the period beginning upon the date of permit issuance and lasting through the date of permit expiration, the permittee is authorized to discharge effluent from the Reservoir Relief Wells (relief wells) for the Main Cooling Reservoir (MCR) and demineralized water from Instrumentation (*i) subject to the following effluent limitations (*2):

Volume: Continuous and flow variable.

Discharge Limitations Minimum Self-Monitoring Requirements Effluent Characteristics Daily Average Daily Maximum Single Grab Report Daily Average and Daily Maximum mg/L mg/L

.mg/L Measurement Frequency Sample Type Dry-Weather Flow (*3)

Report, MGD Report, MGD N/A i/six months Estimate Temperature (*4)

N/A 95OF 950F i/six months In-Situ Total Residual Chlorine (*4) (*5)

N/A 0.05 0.05 i/six months Grab (*6)

(*1)

The Instrumentation is a dissolved oxygen analyzer.

(*2)

See Other Requirement No. 19.

(*3)

See Other Requirement No. 14.

(*4)

See Other Requirement No. 15.

(*5)

See Other Requirement No. 4.

(*6)

Samples must be representative of periods of chlorination.

2.

The pH must be neither less than 6.o standard units nor greater than 9.0 standard units and must be monitored i/six months by grab sample (*4).

3.

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

4.

Effluent monitoring samples must be collected at the following locations: (a) for the demineralized water: from the Instrument Tube prior to commingling with other waters and (b) for the relief well water: at the point of discharge from any flowing relief well prior to entering the PADD (*3) (*4).

z00 0a0 W 3 Page 2f of TPDES, Permit No. WQoooigo8000 STP Nuclear Operating Company to n

EFFLUENT LEMITATIONS AND MONITORING REOUIREMENTS

1.

During the period beginning upon the date of permit issuance and lasting through the date of permit expiration, the permittee is authorized to discharge effluent from the relief wells for the MCR subject to the following effluent limitations (*1):

Volume: Continuous and flow variable.

Discharge Limitations Minimum Self-Monitoring Requirements Effluent Characteristics Daily Average Daily Maximum Single Grab Report Daily Average and Daily Maximum mg/L mg/L mg/L Measurement Frequency Sample Type Dry-Weather Flow (*2)

Report, MGD Report, MGD N/A i/six months Estimate Temperature (*3)

N/A 950F 95°F i/six months In-Situ Total Residual Chlorine (*3) (*4)

N/A 0.05 0.05 i/six months Grab (*5)

(*1)

See Other Requirement No. 19.

(*2)

See Other Requirement No. 14.

(*3)

See Other Requirement No. 15.

(*4)

See Other Requirement No. 4.

(*5)

Samples must be representative of periods of chlorination.

2.

The pH must be neither less than 6.0 standard units nor greater than 9.0 standard units and must be monitored i/six months by grab sample (*3).

3.

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

4.

Effluent monitoring samples must be taken at the following location: At the point of discharge from any flowing relief well prior to mixing with the West Branch of Colorado River (*2) (*3).

z00 W 3 Page 2g of TPDES Permit No. WQoool9o8ooo STP Nuclear Operating Company 00*

EFFLUENI LIMITATIONS AND MONITORING REO,'R.EMENON*

Ouffill Number oQ4

1.

During the period beginning upon the date of permit issuance and lasting through the date of permit expiration, the pernmittee is authorized to discharge effluent from the relief wells for the MCR and effluent from the MCR spillway gates subject to the following effluent limitations (*1):

Volume: Continuous and flow variable.

Discharge Limitations Minimum Self-Monitoring Requirements Effluent Characteristics Daily Average Daily Maximum Single Grab Report Daily Average and Daily Maximum mg/L mg/L mg/L Measurement Frequency Sample Type Dry-Weather Flow (*2)

Report, MGD Report, MGD N/A i/six months Estimate Temperature (*3)

N/A 950F 950F i/six months In-Situ Total Residual Chlorine (*3) (*4)

N/A 0.05 0.05 i/six months Grab (*5)

(*1)

See Other Requirement No. 19.

(*2)

See Other Requirement No. 14.

(*3)

See Other Requirement No. 15.

(*4)

See Other Requirement No. 4.

(*5)

Samples must be representative of periods of chlorination.

2.

The pH must be neither less than 6.o standard units nor greater than 9.0 standard units and must be monitored i/six months by grab sample

(*3).

3.

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

4-Effluent monitoring samples must be taken at the following locations: (a) flow for the relief well water: at the point of discharge from any flowing relief well prior to entering the drainage ditch, (b) flow from the spillway gate leakage: at the basin prior to mixing with other waters, and (c) pH, total residual chlorine, and temperature: at a point in the MCR Spillway Channel after the commingling of spillway gate leakage and relief well water and prior to mixing with other waters.

Page 2h of TPDES Permit No. WQoooi9o8ooo STP Nuclear Operating Company

EFFLUENT IDMITATIONS AND MONITORING REQUIREMENTS Outfall Number oo5

1.

During the period beginning upon the date of permit issuance and lasting through the date of permit expiration, the permittee is authorized to discharge effluent from the relief wells for the MCR subject to the following effluent limitations (*1):

Volume: Continuous and flow variable.

Discharge Limitations Minimum Self-Monitoring Requirements Effluent Characteristics Daily Average.

Daily Maximum Single Grab Report Daily Average and Daily Maximum mgjL mg/L mg/L Measurement Frequency Sample Type Dry-Weather Flow (*2)

ReportM MGD Report, MGD N/A 1/six months Estimate Temperature (*3)

N/A 950F 950F i/six months In-Situ Total Residual Chlorine (*3) (N)

N/A 0.05 0.05 i/six months Grab (*5)

(*1)

See Other Requirement No. 19.

(*2)

See Other Requirement No. 14.

(*3)

See Other Requirement No. 15.

(*4)

See Other Requirement No. 4.

(*5)

Samples must be representative of periods of chlorination.

2.

The pH must be neither less than 6.o standard units nor greater than 9.o standard units and must be monitored i/six months by grab sample (*3).

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

4-Effluent monitoring samples must be taken at the following location: At the point of discharge from any flowing relief well prior to mixing with East Fork Little Robbins Slough (*2) (*3).

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Page 2i of TPDES Permit No. WQooo19o8ooo STP Nudear Operating Company (3

EFFLUENT LDMJTATIONS AND MONITORING REQUIREMENTS Outfall Number oo6

1.

During the period beginning upon the date of permit issuance and lasting through the date of permit expiration, the permittee is authorized to discharge effluent from the relief wells for the MCR subject to the following effluent limitations (*1):

Volume: Continuous and flow variable.

Discharge Limitations Minimum Self-Monitoring Requirements Effluent Characteristics Daily Average Daily Maximum Single Grab Report Daily Average and Daily Maximum mg/L mg/L mg/L Measurement Frequency Sample Type Dry-Weather Flow (*2)

Report, MGD Report, MGD N/A i/six months Estimate Temperature (OF) (*3)

N/A 950F 95°F i/six months in-Situ Total Residual Chlorine (*3) (*4)

N/A 0-05 0.05 i/six months Grab (*5)

(*1)

See Other Requirement No. i9.

(*2)

See Other Requirement No. 14.

(*3)

See Other Requirement No. 15.

(*4)

See Other Requirement No. 4.

(*5)

Samples must be representative of periods of chlorination.

2.

The pH must be neither less than 6.o standard units nor greater than 9.o standard units and must be monitored i/six months by grab sample (*3).

3.

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

4.

Effluent monitoring samples must be taken at the following location: At the point of discharge from any flowing relief well prior to mixing with Little Robbins Slough near Well No. 6 (*2) (*3).

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Page 2j of fl'DES Permit No. WQ0oC 1908000 STP Nuclear Operating Company OD

Attachment STP Nuclear Operating Company TPDES Permit No.

00o DEFINITIONS AND STANDARD PERMIT CONDITIONS As required by Title po Texas Administrative Code (TAC) Chapter 305, certain regulations appear as standard conitions in waste discharge permits. 30 TAC §§3o5.121 - 305.129 (relating to Permit Characteristics and Conditions) as promulgated under the Texas Water Code (TWC) §ý 51o3 and 5.105, and the Texas Health and Safety Code (THSC) §§361.o17 and 361.o24(a), establsh the characteristics and standards for waste discharge permits including sewage sludge, and those sections of 40 Code of Federal Regulations (CFR) Part 122 adopted by reference by the Commission. The follow text includes these conditions and incorporates them into this permit. All definitions in Texas Water Code §26.oo1 and 30 TAO Chapter 305 shall aPPly to this permit and are incorporated by reference. Some specific definitions of words or phrases usedin this permit are as follows:

1. Flow Measurements

a. Annual average flow - the arithmetic average of all 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 imited to major domestic wastewater discharge facilities with a one million gallons per day or greater permitted flow.

b. Daily average flow - the arithmetic average of all determinations of the daily flow within a t.eriod of one calendar month. The daily average flow determination shall consist of eterminations 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 instantaneous measurements taken during that month. Daily average flow determination for intermittent 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 maximum flow sustained for a two-hour period during the period of daily discharge. The average of multiple measurements of instantaneous maximum tfow 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 calendar 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 calendar 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 calendar 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 wvith limitations expressed in terms of mass, the "daily discharge" is calculated as the total Page 3

Attachment STP Nuclear Operating Company TPDES Permit No. I'W'63°80o 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 of concentration 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 aIl samples collected during that day.

e. Bacteria concentration (Fecal coliform, E. coli, or Enterococci) - the number of colonies of bacteria per 1o0 milliliters effluent. The daily average 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 calendar month where n equals the number of measurements made; or computed as the antilogarithm o? the arithmetic mean of the logarithms of all measurements made in a calendar month. For any measurement of bacteria equaling zero, a substitute value of one shall be made for input into either computation method. If specified, the 7-day average for bacteria is the geometric mean of the values for all effluent samples collected during a calendar week.

f. Daily average loading (lbs/day) - the arithmetic average of all daily discharge loading calculations during a period of one calendar month. These calculations must be made for each day of the month ffat a parameter is analyzed. The daily discharge, in terms of mass (lbs/day),

is calculated as (Flow, MGD x Concentration, mg/L x 8.34).

g. Daily maximum loading (lbs/day) - the highest daily discharge, in terms of mass (lbs/day),

within a period of one calendar month.

3. Sample Type

a. Composite sample - For domestic 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 3o 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-h our 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 3o TAC

§319.9(c).

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

4. Treatment Facility (facility) - wastewater facilities used in the conveyance, storage, treatment, recycling, reclamation 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 in 30 TAC Chapter 312. This includes the soIids that have not been classified as hazardous waste separated from wastewater by unit processes.

6. Bypass - the intentional diversion of a waste stream from any portion of a 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 3o TAC §§319.4 - 319.12. Unless otherwise specified a monhly effluent report shall be submitted each month, to the Enforcement Division (MC 224), by the 20th day of the following month for each discharge that 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. lo.

Page 4

Attachment WIC-AE-1 5003Z48 STP Nuclear Operating Company TPDES Permit No.

Qo000190t0ooo As provided by state law the permittee is subject to administrative, civil and criminal penalties, as aplicable, for negligentfy or knowing violating the Clean Water Act; TWC Chapters 26, 27, and 2W and THSC 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, includmii monitoring reports or reports of compliance or noncompliance, or falsifying, tampering with or knowingly rendering inaccurate any monitoring device or method required b1y this permit or violating any other requirement imposed by state or federal regulations.

2. Test Procedures

a. 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 calcflations shall be accurately accomplished in a representative manner.

b. All laboratory tests submitted to demonstrate compliance with this permit must meet the requirements of 30 TAC Chapter 25, Environmental Testing Laboratory Accreditation and Certification.

3. Records of Results

a. Monitoring samples and measurements shall be taken at times 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 (or longer as required by 40 CFR Part 5o3), monitoring and repoirting records, including strip charts and records of cai bration and maintenance, copies of allrecords required by this permit, records of all data used to complete the application for this permit, and the certification 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 of three years from the date of the 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; ii. identity ofindividual 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 pqriod 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 may be 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 sha include in the calculation and reporting of the 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 at plant start-up and as often thereafter as necessary to ensure accuracy, but not less often than annually unless authorized by the Executive Director for a longer period. Such person shall verify in writing that the device is operating properly and giving accurate results. Copies of the verification shall be retained at the facility site or shall-be readily available for review by a TCEQ representative for a period of three years.

Page 5

Attachment

• O*AE-1 5003?,48 STP Nuclear Operating Company TPDES Permit No. w6ooo19o0ooo4

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 3o TAC §305.125(9) any noncompliance that 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 b the perrittee to the Regional Office and the Enforcement Division (MC 224 witin five worldng days of becoming aware of the noncompliance. The written submission shall contai a description ofthe noncompliance and its cause; the potential danger to human health or safety, or the environment; te 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 that 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 that deviates from thepermitted effluent limitation by more than 40% shall be reported by the permittee in wnting 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 3o TAC §§35.301 - 35.303 (relating to Water Quality Emergency and-Temporar Orders) if the permittee knows in advance of the need for a bypass, it shal submit prior notice by applying for such authorization.

9. Changes in Discharges of Toxic Substances All existing manufacturing, commercial, mining3 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 that would result in the discharge, on a routine or frequent basis, of any toxic pollutant listed at 40 CFR Part 122, Appendix D, Tables II and III (excluding Total Phenols) that is not limited in the permit, if that discharge will exceed the highest of the following notification levels":

i. one hundred micrograms per liter (loo pg/L);

ii. two hundred micrograms per liter (2oo [g/L) for acrolein and acrylonitrile; five hundred micrograms per liter (5oo pg/L) for 2,4-dNitrophenol and for 2-methyl-4,6-dinitrophenol; and one milligram per liter C-i mg/L) for antimony; iii. five (5) times the maximum concentration value reported for that pollutant in the permit application; or iv. thne level established by the TCEQ.

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

Page 6

Attachment

.Q-AE-1 5003?,48 STP Nuclear Operating Company TPDES Permit No. W6Ao519ot4ooo

i. five hundred micrograms per liter (5oo pg/L);

ii. one millivram Ier liter (1 mg/L) for antimony-iii. ten (io) times the maximumi concentration value reported for that pollutant in the permit pplication; or iv. the level established by the TCEQ.

io. 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 3o TAC §305.128 (relating to Signatories to Reports).

ii. All Publicly Owned Treatment Works (POTWs) must provide adequate notice to the Executive Director of the following:

a. an new introduction of pollutants into the POTW from an indirect discharger that would be subject to CWA §301 or §3W6 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 antieipated impact of the change on the quantity or quality of effluent to be discharged from the POTW.

PFRMIT CONDITIONS

1. General

a. When the permittee 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 thepermittee during action o an application, and relying upon the accuracy and completeness of ffat information and those representations. After notice and opportunity for a hearfng,'this permit may be modified, suspended, or revoked, in whole or in part, in accordance with 30 TAC Chapter 3o5, Subehapter D, 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 or permanent reduction or elimination of the 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.

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.

Page 7

Attachment STP Nuclear Operating Company TPDES Permit No. W&&-M3*° oo

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 permittee shall take all reasonable steps to minimize or prevent any discharge or sludge use or disposal or other permit violation that has a reasonable likelihood of adversely affecting human health or the envronment.

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 accordanceywith 30 TAC §§3o5.62 and 305.66 and TWC §7.302. The filing ofa request by the permittee for a permit amendment, suspension and reissuance, or termination, or a notification of planned chaanges or anticipated noncompiance) 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 permit.

h. In accordance with 3o TAC §305.535(a), the permittee may allow any bypass to occur from a TPDES permitted facility that does not cause permitted effluent limitations to be exceeded or an unauihorized 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, under Texas Water Code §§7.o51 - 7.075 (relating to Administrative Penalties5, 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 CWA §§3o1, 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 TWC Chapters 26, 27, and 28, and THSC 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 investigabng conditions relatmig 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 imm edi'ate danger to public health or the environment, to remove or remediate a condition related to the quality of water in the state Members, employees, Commission contractors, or agents acting under this authority who enter pnvate property shall observe the establishment's rufles 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 p roper credentials. If any member, employee, Commission contractor or agent is refusedthe right to enter in or on public or private property under this autrority, the Executive Director may invoke the remedies authorized in TWO §7.002. The statement above, 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, put merely desenbes the Commission's duty to observe appropriate rules and regulations during an inspection.

4. Permit Amendment or Renewal

a. The permittee shall give notice to the Executive Director as soon as possible of any planned phyeal alteratisionss d

dt i to herv ermitped facility if such alterations or addibons would require a permit amendment or result i a violation of permit requirements. Notice shall also be required under this paragraph when:

Page 8

Attachment YR,QC-AE-1 5003248 STP Nuclear Operating Company TPDES Permit No. W 5ooo39o2ooo

i. the alteration or addition to a permitted facility may meet one of the criteria for determining whether a facility is a new source m accordance with 3o 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 that are subject neither to effluent limitations in thepermit, nor to notification requirements in Monitoring and Reporting Requirements No. 9; or 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 pe-ri't 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 at least 18o days 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 that are not described in the permit application or that 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 inpermit conditions, including effluent limitations for pollutants not identified and fimited-by ths permit.

e. In accordance with the TWC §26.o29(b), after a public hearing, notice of which shall be given to the permittee, the Commission may require the permittee, trom time to time for good cause, in accordance with applicable laws, to conform to new or additional conditions.

f. If any toxic effluent standard or prohibition (including any schedule of compliance specified in such effluent standard or prohibition) is promulgated-under CWA §307(a) for a toxic pollutant that is present in the discharge and that standard or prohibition is more stringent than any limitation on the pollutant in this permit, 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 or prohibitions established under CWA §307(a) 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 im writing of any change in control or ownership of facilities authorized by this permit. Such notification should be sent to the Applications Review and Processing Team (MC 148) of the Water Quality Division.

b. A permit may be transferred only according to the provisions of 30 TAC §305.64 (relating to Transfer of Permits) and 3o 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 stora e, rocessing, or disposal that requires a permit or other autorization pursuant to the Texas IeaFth and Safety Code.

Page 9

Attachment STP Nuclear Operating Company TPDES Permit No.

0-9O 000

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 Texas Water Code Chapter 11.

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

9. Permit Enforceability The conditions of this permit are severable, and if any provision of this permit, or the application of anyprovision of this 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.

"o. Relationship to Permit Application The application pursuant to which the permit has been 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.

11. 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 ii (Bankruptcy) of the United States Code (ii USC)-by or against:

i. the permittee" ii. an entity (as tat term is defined in 1' USC, §101(15)) controlling the permittee or listing the permit or permittee as property of the estate; or iii. an ffiliate (as that term is atefmned in 11 USC, §101(2)) of the permittee.

b. This notification must indicate:

i. the name of thepermittee; ii. the permit number(s);

iii. the bap

_tcy court in which the petition for bankruptcy was filed; and iv. the date of ling 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 contrl rocess control, maintenance, and operations records shall bie 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 cornpliance with Commission rules. Unless otherw~ise.

specified in this permit or otherwise ordered-by the Commission, the permittee shall comply with TaJl 9.ap lcbeproiin of 30 TAG Chap)ter 312 concerning sewage sludge use and disposal and 30 TAC§31.21-319.29 concerning the dscharge of certain naazar ous metals.

3. Domestic wastewater treatment facilities shall comply with the following provisions:

a. The permittee shall notify the Municipal Permits Team, Wastewater Permitting Section (MC 148) of the Water Quality Division, in writing, of any facility expansion at least 9o days prior to conducting such activity.

b. The permittee shall submit a closure plan for review and approval to the Municipal Permits Team, Wastewater Permitting Section (MC 148) of the Water Quality Division, for any closure Page 1O

Attachment NOCAE-1 50037,48 STP Nuclear Operating Company TPDES Permit No. W 5oool3ot8ooo activity at least 90 days prior to conducting such activity. Closure is the act of permanently taking a waste management unit or treatment facility out of service and includes the permanent removal from service of any pit, tank, pond, lagoon, surface impoundment 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, 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 w-hch effluent flow may--be determined.

6. The permittee 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 TWC §7.3o2(b)(6).

7. Documentation For all written notifications to the Commission required of the permittee by thispermit, 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 TDES permit applications, effluent data, including effluent data in permits, draft rnits and permit applications, and other information specified as not confidential in 30 TAC §1.5 d), anyinformation submitted pursuant to this permit may be claimed as confidential by the submitter. Any_ such claim must be asserted in the manner p*rescribed in the application form or by stamping the words "confidential business information on each page.

containing such information. I no claim is made at the time of submission, information may be made av alale to the public without further notice. If the Commission or Executive Director agrees with the designation of confidentiality, the TCEQ will not provide the information for public inspection unless required by the Texas Attorney General or a court pursuant to an open records request. if the Executive Director does not agree with the designation of confldentiah'ty, the person submitting the information will be notified.

8. Facilities that generate domestic wastewater 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% of the permitted daily average or annual average flow for three consecutive months, the permittee must initiate engineer-ing and financial planning for expansion or upgradinf of the domestic.

wastewater treatment or collection facffities. Wenever the flow reach*es 9o% of the permitted daily avenage or annual average flow for three consecutive months, the permittee shall obtain neessary authorization from the Commission to ommence construction of the necessary additional treatment or collection facilities. In the case of a domestic wastewater treatment facility that reaches 75% of the permitted daily average or annual average flow for three consecutive months, and the planned population to be served or the quantity of wate produced is not e.xpected to exceed the design limitations of the treatment facility, the p~ermittee shall submit an engineering report supporting this claim to the Executive Director of the Comnission.

If in hjm or by Executivr the judgmentoffthenExeutiveiDirctepopulation to be served will not cause permit noncompliance, then the requirement of this section may be waived. To be effective,, any mwaiver must be in writing andsigned 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 plats and specifications for domestic sewage collection and treatment works associatedsi with any domestic permit must be approved by the Commission, and failure to secure approval before commencing construction of such work or making a discharge is a violation of this permit and each day is an additional violation until approval has been secured.

c. Permits for domestic wastewater treatment plants areWgranted subject to the policy of the Comidssion to encourage the development of area-wide waste collection, treatment, and Page 11

Attachment

.NOGAE-150032.48 STP Nuclear Operating Company TPDES Permit No. w&Booo9oZooo disposal systems. The Commission reserves the right to amend any domestic wastewater permit in accordance with applicable procedural requirements to require the system covered b thispermit 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 dischaFrec from said system, to such area-wide system; or to amend this permit in any other particular to effectuate the Commission's policy. Such amendments may be made when the changes required are advisable for water quality control purposes and are feasible on the basis of waste treatment technolo~gy, 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 treatment plants shall be operated and maintained by sewage plant operators holding a valid certificate of competency at the required level as defined in 3o TAC Chapter 30.

1o. For Publicly Owned Treatment Works (POTWs), the 3o-day average (or monthly average) percent removal for BOD and TSS shall not be less than 85%, unless otherwise authorized by this permit.

ii. Facilities that generate industrial solid waste as defined in 3o TAC §335.1 shall comply with these provisions:

a. Any solid waste, as defined in 3o TAC §335.1 (including but not limited to such wastes as garba e refuse, sludge from a waste treatment, water supply treatment plant or air pollution control faciity, discarded materials, discarded materials to be recycled, whether the waste is solid, liquid, or semisolid), generated by the permittee during the management and treatment of wastewater, must be managed in accordance with all applicable provisions of 3o 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 applicable provisions of3o TAC Chapter 335.

c. The permiftee shall provide written no tfication, pursuant to the requirements of 30 TAO

§_335.8(b)(1), to the Corrective Action Section (M~C 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 activty.

d. Construction of any industrial solid waste management unit requires the prior written notification of the. proposed activity to the Registration and Reporting Se&tion (MC 129) of the Permitting and Remediation Support Division. No person shall dispose of industrial solid waste, including sludge or other solids from wastewater treatment processes, prior to fulfilling the deed recorciation requirements of 3o 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 on land used to manage industrial solid waste.

f. The permittee shall keep management records for all sludge(or other waste) removed from any wastewater treatment process. These records shall ful all applicable requirements of o TAC Chapter 335 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 facilit site, or shall be readily available for review by authorized representatives of the TCEQ for at least five years.

Page 12

Attachment T.SPermi No E-1 50032g48 TPDES Permit No. IWOOO19O0 OOO STP Nuclear Operating Company

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 of in accordance with THSC Code Chapter 361.

TCEQ Revision o8/2oo8 Page 13

Attachment O.C.AE-1 500324.8 STP Nuclear Operating Company TPDES Permit No. waooo19oZooo OTHER REQUIREMENTS

1. 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 General Land Office 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 must 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 permittee becomes aware of the violation, followed by a written report within five working days to TCEQ Region 12 and the Enforcement Division (MC 224):

Pollutant MAL* (mg/L)

Copper (Total) 0.002 Iron, Total 0.007 Minimum Analytical Level 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 (o) shall be used for that measurement when making calculations 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 (o) 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 (o) for

[list parameter(s)l on the self-reporting form for

[monitoring period date rangel 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 making calculations for the self-reporting form. A zero (o) may not be used.

3. Discharge from the Main Cooling Reservoir via Outfall oo0 must not exceed 12.5% of the flow of the Colorado River at the discharge point, and there must be no discharge from Outfall oo1 when the receiving water flow adjacent to the plant is less than 8oo cubic feet per second.

4. Total Residual Chlorine A. The term "total residual chlorine" (or total residual oxidants for intake water with bromides) means the value obtained using any of the "chlorine-total residual" methods in Table IB in 40 CFR Part 136.3(a), or other methods approved by the permitting authority.

B. 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.

C. Simultaneous multi-unit chlorination is permitted.

Page 14

Attachment NR&O-AE-1 5003Z.48 STP Nuclear Operating Company TPDES Permit No.

AEo195oooo D. Samples for total residual chlorine analysis for discharges via Outfalls 002, 003, 004, and oo5 may alternatively be collected from the relief wells located in the drainage area for Outfall oo6.

E. Total residual chlorine sampling for reporting at Outfall oo6 must be conducted as follows:

The permittee shall collect a grab sample from the same five relief wells that will be used to determine the flow. The maximum total residual chlorine concentration recorded must be reported.

5. There shall be no discharge of polychlorinated biphenyl compounds such as those commonly used for transformer fluid.

6. 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.

7. 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.

8. For discharges via Outfall OOl, the daily average temperature is defined as the flow weighted average temperature (FWAT). The FWAT must be computed and recorded on a daily basis at equal time intervals not greater than two hours on days when Outfall ooi is discharging. The method of calculating FWAT is as follows:

FWAT = 7(-NSTANTANEO US FLOW x INSTANTANEO US TEMPERA TURE)

X_(INSTANTANEOUS FLOW)

Daily average temperature must be calculated as the arithmetic average of all FWATs calculated during the calendar month. Daily maximum temperature must be the highest FWAT calculated during the calendar month.

9. 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 include but are not limited to: wet scrubber air pollution control systems, ion exchange waste treatment systems, water treatment evaporator blowdown, laboratory and sampling streams, boiler blowdown, floor drains, cooling tower basin cleaning wastes and blowdown from recirculating house service water systems. Sanitary and air conditioning wastes are not included.

1o. MONITORING AND REPORTING A. This provision supersedes and replaces the first paragraph of Monitoring and Reporting Requirement No. 1 found on Page 4 of this permit:

Monitoring results shall be provided at the intervals specified in this permit. Unless otherwise specified in this permit or otherwise ordered by the Commission, the permittee shall conduct effluent sampling and reporting in accordance with 3o 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-reporting form, Discharge Monitoring Report Form EPA No. 3320-1, signed and certified as required by Monitoring and Reporting Requirements No. 10.

B. For pollutants which are monitored annually, effluent reports shall be submitted in September of each year. For pollutants which are monitored twice per year, the first effluent report must be Page 15

Attachment TPDES Permit No. WASf o STP Nuclear Operating Company submitted six months after the date of discharge, and subsequent reports must be submitted every six months thereafter. For pollutants which are monitored four times per year, the first effluent report must be submitted three months after the date of discharge, and subsequent reports must be submitted every three months thereafter.

1i. Mixing Zone Definitions Outfall oow:

Outfall 002:

Outfall 003:

Outfall 004:

Outfall 005:

Outfall oo6:

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 Tidal. Chronic toxic criteria apply at the edge of the mixing zone.

There is no mixing zone established for this discharge to an intermittent stream.

Acute toxic criteria apply at the point of discharge.

The mixing zone is defined as a volume within a radius of 17.5 feet from the point of discharge. Chronic toxic criteria apply at the edge of the mixing zone.

There is no mixing zone established for this discharge to an intermittent stream.

Acute toxic criteria apply at the point of discharge.

There is no mixing zone established for this discharge to an intermittent stream.

Acute toxic criteria apply at the point of discharge.

The mixing zone is defined as 300 feet downstream and aoo feet upstream from the point of discharge. Chronic toxic criteria apply at the edge of the mixing zone.

12. This provision supersedes and replaces Definition and Standard Permit Conditions No. 2.a., Daily Average Concentration, as defined on page 3 of this permit:

Daily average concentration shall mean the arithmetic average (weighted by flow) of all effluent samples, composition or grab as required by this permit, within a period of one calendar month, consisting of at least four separate representative measurements. When four samples are not available in a calendar month, 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.

13. The discharge of uncontaminated groundwater generated during excavations for the construction of the new electric generating Units 3 and 4 is authorized under TPDES Construction General Permit TX[I5oooo. This groundwater may be discharged temporarily via Outfall oo0 during the construction of Units 3 and 4. This discharge must not cause nuisance conditions.

14. Measurement of Flow at Outfalls 002, 00 004, oo.0, and oo6 From the 776 relief wells surrounding the MCR, the permittee has identified and documented the relief wells covered in the drainage area for each of the outfalls. The permittee has established that there are always at least five wells that are flowing within the drainage area of each outfall during a monitoring event. Within each outfall drainage area, the permittee shall clearly identify each relief well used for flow monitoring with a number and record the relief wells used during each monitoring event. The permittee shall not use exactly the same five wells for flow monitoring in successive sampling events. The flow estimate for each of the outfalls shall be determined as follows:

Outall 002 At the time of sample collection, the permittee shall measure the flow at five of the 168 relief wells before the discharge enters the PADD. The average flow from the relief wells (Fl) must be calculated as the arithmetic average of all five of the measured flows. Measured flow means the determination of volume of effluent discharged per unit time (e.g., gallons per minute). The demineralized water flow (F2) must be measured at the Instrument Tube prior to commingling with other waters.

The flow for Outfall oo2 must be reported as [(Fix168) + F2] in MGD.

Page 16

Attachment W

-AE-15003W.48 STP Nuclear Operating Company TPDES Permit No. W 0oo90o 000 Ozufall oo0q At the time of sample collection, the permittee shall measure the flow at five of the 70 relief wells before the discharge enters West Branch of Colorado River. The average flow (Fx) at Outfall 003 must be calculated as the arithmetic average of all five of the measured flows.

The flow for Outfall 003 must be reported as (Fx x 7o) in MGD.

OutfWl 0o4 At the time of sample collection, the permittee shall measure the flow at five of the 66 relief wells before the discharge enters the unnamed ditch. The average flow from the relief wells (FI) must be calculated as the arithmetic average of all five of the measured flows. The flow from MCR spillway gate leakage (F2) must be estimated at the basin prior to commingling with other waters.

The flow for Outfall oo4 must be reported as [(Fix 66) + F2] in MGD.

Outfall oo, At the time of sample collection, the permittee shall measure the flow at five of the 265 relief wells before the discharge enters East Fork Little Robbins Slough. The average flow (Fx) at Outfall oo5 must be calculated as the arithmetic average of all five of the measured flows.

The flow for Outfall 005 must be reported as (Fx X 265) in MGD.

Outfall oo6 At the time of sample collection, the permittee shall measure the flow at five of the 207 relief wells before the discharge enters Little Robbins Slough. The average flow (Fx) at Outfall oo6 must be calculated as the arithmetic average of all five of the measured flows.

The flow for Outfall oo6 must be reported as (Fx x 207) in MGD.

15. Measurement of pH, Temperature, and Total Residual Chlorine at Outfalls 002, 003, 004, oos., and oo6 Within each outfall drainage area, the permittee shall clearly identify each of the five relief wells sampled with a number and record the numbers of the five relief wells used during each sampling event. The relief wells sampled must be the same five relief wells used to determine the flow. The permittee shall not use exactly the same five wells in successive sampling events.

Samples for total residual chlorine analysis for discharges via Outfalls 002, 003, 004, and 0o5 may be collected from the relief wells located in the drainage area for Outfall oo6 as authorized by Other Requirement No. 4 of this permit. For each outfall, the pH and temperature must be determined and the total residual chlorine may be determined as follows:

Outfall 002 Grab samples must be obtained from each of the five relief wells, and a grab sample of the demineralized water must be collected from the Instrument Tube. Analytical results for each parameter analyzed at the Instrument Tube and the relief wells must be compared, and the maximum temperature, the maximum total residual chlorine, and the maximum and minimum pH values must be used for compliance reporting purposes at Outfall 002.

Oufallo0.

Grab samples must be obtained from each of the five relief wells. Analytical results for each parameter analyzed at the relief wells must be compared, and the maximum temperature, the maximum total residual chlorine, and the maximum and minimum pH values must be used for compliance reporting purposes at Outfall 003.

Page 17

Attachment Permit No.

_-AE-150032,.48 STP Nuclear Operating Company TPDES Permit No. WkJ 50019oZ Outfall 004 Grab samples must be obtained at a point in the MCR Spillway Channel after the commingling of spiliway gate leakage and relief well water but prior to mixing with other waters. The maximum temperature, the maximum total residual chlorine, and the maximum and minimum pH values must be used for compliance reporting purposes at Outfall 004.

014/all oa' Grab samples must be obtained from each of the five relief wells. Analytical results for each parameter analyzed at the relief wells must be compared, and the maximum temperature, the maximum total residual chlorine, and the maximum and minimum pH values must be used for compliance reporting purposes at Outfall 005.

Outfall oo6 Grab samples must be obtained from each of the five relief wells. Analytical results for each parameter analyzed at the relief wells must be compared, and the maximum temperature, the maximum total residual chlorine, and the maximum and minimum pH values must be used for compliance reporting purposes at Outfall oo6.

16. The permittee shall continue to operate and maintain the cooling water intake structure (CWIS) consistent with the letter submitted to the Environmental Protection Agency (EPA) by Houston Lighting & Power Co. dated 6/28/82 on the South Texas Project (STP) Reservoir Makeup Pumping Facility (RMPF) design (STP correspondence number ST-HL-FD-io6) and approval of the RMPF design as Best Technology Available (BTA) by the EPA in a letter dated 11/19/82) for minimizing Adverse Environmental Impact (AEI).

Specifically, the permittee shall adhere to the following conditions related to the operation, maintenance, and monitoring of the RMPF:

a. The pumps are operated intermittently based on reservoir level, river flow and water quality in accordance with standard operating procedures for the RMPF

b. Diversion from the Colorado River is limited to 55% of the flow over 300 cubic feet per second to protect inflows during low river flow conditions in accordance with Certificate of Adjudication 14-5437A, which may be amended from time to time

c. The screens must initiate a cleaning cycle whenever the water level differential (before and after the screens) exceeds eight inches

d. Screens must be in proper operating condition whenever the pumps are withdrawing water. If a screen must be taken out of service for maintenance, the differential pressure across the screens must maintain compliance with item c. above

e. Screens must be checked daily during makeup pumping operations

f. Water and impinged material resulting from the cleaning process must enter a concrete trench from which material is directed to a trash basket or back to the river depending on the amount of debris being collected. Debris collected in the trash basket must be disposed of appropriately

g. Records (e.g., electronic logs, operating procedures, operator logs, etc.) documenting the operation and maintenance described above must be kept onsite for a minimum of three years, and made available to TCEQ personnel upon request If it is later determined that the current CWIS configuration is not representative of BTA for minimizing AUI, the permit may be reopened to incorporate additional requirements.

The CWIS requirements above may be modified or removed in subsequent permit actions (renewals or amendments) based on the CWIS requirements effective in 40 CFR Part 125, Subpart J-Requirements Applicable to Cooling Water Intake Structures for Existing Facilities Under Section 316(b) of the Clean Water Act.

Page 18

Attachment lQCAE-1 5003;,g,8 Si' Nuclear Operating Company TPDES Permit No. WQ 5ooo19o0oo Any application for renewal of this permit, or any amendment requesting changes to the CWIS configuration, must contain information required in 40 CFR §122.21(r), as applicable.

17. Wastewater discharged via Outfall oo0 must be sampled and analyzed as directed below for those parameters listed in Tables 1, 2, 3, 4, and 5 of Attachment A of this permit. Analytical testing for Outfall ool must be completed within 6o days of initial discharge. Results of the analytical testing must be submitted within 90 days of initial discharge to the TCEQ Industrial Permits Team (MC-148). Based on a technical review of the submitted analytical results, an amendment may be initiated by TCEQ staff to include additional effluent limitations, monitoring requirements, or both.

Table 1: Analysis is required for all pollutants. Wastewater must be sampled and analyzed for those parameters listed in Table 1 for a minimum of one sampling event.

Table 2: Analysis is required for those pollutants in Table 2 that are used at the facility that could in any way contribute to contamination in the Outfall oo0 discharge. Sampling and analysis must be conducted for a minimum of one sampling event.

Table 3: For all pollutants listed, the permittee shall indicate whether each pollutant is believed to be present or absent in the discharge. Sampling and analysis must be conducted for each pollutant believed present for a minimum of one sampling event.

Table 4: Analysis is required for all pollutants. Wastewater must be sampled and analyzed for those parameters listed in Table 4 for a minimum of one sampling event.

Table 5: Analysis is required for all pollutants. Wastewater must be sampled and analyzed for those parameters listed in Table 5 for a minimum of one sampling event.

The permittee shall report the flow at Outfall ool in MGD in the attachment. The permittee shall indicate on each table whether the samples are composite (C) or grab (G) by checking the appropriate box.

18. This permit does not authorize discharges of stormwater associated with industrial activity via Outfalls 002, 003, 004, 005, or oo6. These discharges are currently authorized under the TPDES Multi-Sector General Permit (Authorization No. TXRo5P472).

19. Flow measurements or sampling events conducted at Outfalls 002, 003, 004, 005, and oo6 on days when the rainfall exceeds o.1 inches during any 24-hour period must not be used for compliance monitoring purposes. The permittee shall maintain a permanent rain gauge at the plant site and keep daily records of rainfall that can be made available to the TCEQ personnel upon request.

20. THERMAL PLUME STUDY FOR OUTFALL oo0 The permittee shall develop and submit to the TCEQ, within one year of the permit effective date, a plan to characterize the thermal plume in the receiving water through either the use of a model, mass balance, or via collected or existing in-stream temperature data. The permittee would then be required to implement the plan following its approval by the TCEQ.

The permittee is hereby placed on notice that the Executive Director of the TCEQ will be initiating changes to evaluation procedures and/or rulemaking that may affect thermal requirements for this facility.

Page 19

Attachment TPDES Permit No. w-A-oo19o' ooo SrP Nuclear Operating Company I

Attachment A Table 1 Outfall No. 001 1C 11G Effluent Concentration (mg/L)

Pollutant Samp. 1 Samp. 2 Samp. 3 Samp. 4 Average Flow (MGD)

BOD (5-day)

CBOD (5-day)

Chemical Oxygen Demand Total Organic Carbon Dissolved Oxygen Ammonia Nitrogen Total Suspended Solids Nitrate Nitrogen Total Organic Nitrogen Total Phosphorus Oil and Grease Total Residual Chlorine Total Dissolved Solids Sulfate Chloride Fluoride Temperature (OF)

Total Alkalinity (mg/L as CaCO3) pH (Standard Units; min/max)

Pollutant Effluent Concentration (IgJL) *MAL

_(lg/L)

Total Aluminum 2.5 Total Antimony S

Total Arsenic 0.5 Total Barium 3

Total Beryllium 0.5 Total Cadmium 1

Total Chromium 3

Trivalent Chromium N/A Hexavalent Chromium 3

Total Copper 2

Cyanide 2

Total Lead 0.5 Total Mercury 0.005 Total Nickel 2

Total Selenium 5

Total Silver 0.5 Total Thallium 0.5 Total Zinc 5.0 Indicate units if different from ptg/L.

Minimum Analytical Level Page 20

Attachment T _S P i

_NO AE-150032,48 TPDF_

Permit No. W6_ooo19otsooo ST Nuclear Operating Company Table 2 Outfall No. 001

[]C [EG Samp. 1 Samp. 2 Samp. 3 Samp. 4 Avg.

MAL Pollutant (lig/L)*

(IgJL)*

(lag/L)*

(lig/L)*

(Ig/L)*

(lag/L)

Acrylonitrile 50 Anthracene 10 Benzene 10 Benzidine 50 Benzo(a)anthracene 5

Benzo(a)pyrene 5

Bis(2-chloroethyl)ether 10 Bis(2-ethylhexyl)phthalate 10 Bromodichloromethane 10 Bromoform 10 Carbon Tetrachlorrde 2

Chlorobenzene 10 Chlorodibromomethane 10 Chloroform 10 Chrysene 5

Cresols

.10 1,2-Dibromoethane 10 m-Dichlorobenzene 10 o-Dichlorobenzene 10 p-Dichlorobenzene 10 3,3'-Dichlorobenzidine 5

1,2-Dichloroethane 10 1,1-Dichloroethylene 10 Dichloromethane 20 1,2-Dichloropropane 10 2,4-Dimethylphenol 10 DI-n-Butyl Phthalate 10 Ethylbenzene 10 Fluoride 500 Hexachlorobenzene 5

Hexachlorobutadiene 10 Hexachlorocyclopentadiene 10 Hexachloroethane 20 Methyl Ethyl Ketone 50 Nitrobenzene 10 N-Nitrosodiethylam ine 20 N-Nitroso-di-n-Butyla mine 20 Nonylphenol 333 Pentachlorobenzene 20 Pentachlorophenol 5

Phenanthrene 10 Polychlorinated Biphenyls (PCBs) **

0.2 Page 21

Attachment PNC-AE-1o5003248 TPDES Permit No. wQooo19otsooo, STP Nuclear Operating Company Outfall No. 001

'C :-]G Samp. 1 Samp. 2 Samp. 3 Samp. 4 Avg.

MAL Pollutant (14gJL)*

(148g/L)*

(pdL)*

(lagJL)*

(lJgL)*

(pg/L)

Pyridine 20 1,2,4,5-Tetrachlorobenzene 20 1,1,2,2-Tetrachloroethane 10 Tetrachloroethylene 10 Toluene 10 1,1,1-Trichloroetha ne 10 1,1,2-Trichloroethane 10 Trichloroethylene 10 2,4,5-Trichloropheno I 50 TTHM (Total Trihalomethanes) 10 Vinyl Chloride 10 Indicate units if different from pg/L Total PCB-1242, PCB-1254, PCB-1221, PCB-1232, PCB-1248, PCB-126o, PCB-Ioi6 Table 3 Outfall No. 001 oC oG Believed Believed Effluent Concentration (mg/L)

No. of Present Absent Samples Pollutant Average Maximum Bromide Color (PCU)

Nitrate-Nitrite (as N)

Sulfide (as S)

Sulfite (as 503)

Surfactants Total Boron Total Cobalt Total Iron Total Magnesium Total Molybdenum Total Manganese Total Tin Total Titanium Table 4 Outfall No. 001 CC DG Average Maximum No. of MAL Pollutant (lig/L)*

(agg/L)*

Samples (lig/L)

Acrolein 50 Acrylonitrile 50 Benzene 10 Bromoform 10 Carbon tetrachloride 2

Chlorobenzene 10 Chlorodibromomethane 10 Chloroethane 50 Page 22

Attachment

• 0C-AE-15003?Z48 TPDES Permit No. wQ6ooo19otooo STP Nuclear Operating Company Outfall No. 001 aC oG Average Maximum No. of MAL Pollutant (Pg/L)*

(pg/L)*

Samples (Ig/L) 2-ChIoroethylvinyl ether 10 Chloroform 10 Dichlorobromomethane [Bromodichloromethanel 10 1,1-Dichloroethane 10 1,2-Dichloroethane 10 1,1-Dichloroethylene [1,1-Dichloroethene]

10 1,2-Dichloropropane 10 1,3-Dichloropropylene [1,3-Dichloropropenel 10 Ethylbenzene 10 Methyl bromide [Bromomethane]

50 Methyl chloride [Chloromethane]

50 Methylene chloride [Dichloromethane]

20 1,1,2,2-Tetrachloroethane 10 Tetrachloroethylene [Tetrachloroethene]

10 Toluene 10 1,2-Trans-dichlo roethylene [1,2-Trans-dichloroethene]

10 1,1,1-Trichloroethane 10 1,1,2-Trichloroethane 10 Trichloroethylene [ Trichloroethene]

10 Vinyl chloride 10 Indicate units if different from pg/L.

Table 5 Outfall No. 001 oC oG Average Maximum No. of MAL Pollutant (pwg/L)*

(plg/L)*

Samples (pg/L) 2-Chlorophenol 10 2,4-Dichlorophenol 10 2,4-Dimethylphenol 10 4,6-Dinitro-o-Cresol 50 2,4-Dinitrophenol 50 2-Nitrophenol 20 4-Nitrophe~nol 50 p-Chloro-m-Cresol 10 Pentachlorophenol 5

Phenol 10 2,4,6-Trichlorophenol 10 Indicate units if different from Vg/L.

Page 23

Attachment PemtN. IQAE-A150032-48 STP Nuclear Operating Company TPDES Permit N1o. wo 9o-E ooo CHRONIC BIOMONITORING REQUIREMENTS: MARINE The provisions of this section apply to Outfall oo0 for whole effluent toxicity (WET) testing.

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 or growth of the test organisms.

b.

The permittee shall conduct the following 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-o2-014) or its most recent update:

i)

-Chronic static renewal 7-day survival and growth test using the mysid shrimp (Americamysis bahia) (Method 1007.0). 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 loo6.o). 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 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.

The permittee shall use five effluent dilution concentrations and a control in each toxicity test. These additional effluent concentrations are 5%, 7%, 1o%, 13%, and 17%

effluent. The critical dilution, defined as 13% effluent, is the effluent concentration representative of the prop6rtion of effluent in the receiving water during critical low flow or critical mixing conditions.

d.

This permit may be amended to require a WET limit, a Chemical-Specific (CS) limit, a Best Management Practice (BMP), or other appropriate actions to address toxicity. The permittee may be required to conduct a Toxicity Reduction Evaluation after multiple toxic events.

e.

Testing Frequency Reduction I)

If none of the first four consecutive quarterly tests demonstrates significant toxicity, the permittee may submit this information in writing and, upon approval, 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 toxicity, the permittee shall continue quarterly testing for that species until the permit is reissued. If a testing frequency reduction had been Page 24

Attachment

• Q O-AE-150032?48 STP Nuclear Operating Company TPDES Permit No.

)o000190?oooo previously granted and a subsequent test demonstrates significant toxicity, the permittee will resume a quarterly testing frequency for that species until the permit is reissued.

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:

I) a control mean survival of 8o% 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 0.43 mg or greater for surviving preserved inland silverside;

4) a control Coefficient of Variation percent (CV%) between replicates of 40 or less 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 Percent Minimum Significant Difference of 37 or less for mysid shrimp growth; and

7) a Percent Minimum Significant Difference of 28 or less 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 manual referenced above, or its most recent update.

2)

The permittee 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 (WET) Testing (40 CFR Part 136)" (EPA 821-B-oo-oo4),

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 Page 25

Attachment W(*AOE -15 00 32,48 STP Nuclear Operating Company TPDES Permit No. w o19otooo demonstrated. A significant effect is herein defined as a statistically significant difference between the survival, reproduction, or growth of the test organism(s) in a specified effluent dilution compared to the survival, reproduction, or gopwth of the test organism(s) in the control (o% 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 2 above.

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.

7)

Staff will review test results for consistency with rules, procedures, and permit requirements.

c.

Dilution Water

1)

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

2)

Where the receiving water proves unsatisfactory as a result of preexisting 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 follow-ing 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); and c) the permittee submitted all test results indicating receiving water toxicity with the reports and information required in Part 3 of this Section.

3)

The synthetic dilution water shall consist of a standard, reconstituted seawater.

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

d.

Samples and Composites

1)

The permittee shall collect a minimum of three composite samples from Outfall ooi. The second and third composite samples will be used for the renewal of the dilution concentrations for each toxicity test.

2)

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

Page 26

Attachment 0 -AE-1 5003,248 STP Nuclear Operating Company TPDES Permit No. w6 0oooigoo000

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 first composite sample. The holding time for any subsequent 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 />. Samples shall be maintained at a temperature of o-6 degrees Centigrade during collection, shipping, and storage.

4)

If Outfall o0o1 ceases discharging during the collection of effluent samples, the requirements for the minimum number of effluent samples, the minimum numbers 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 renewal 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 sample collection duration and the static renewal protocol associated with the abbreviated sample collection must be documented in the full report.

3.

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

a.

The permittee shall prepare a full report of the results of all tests conducted in accordance with the manual referenced above, or its most recent update, for every valid and invalid toxicity test initiated whether carried to completion or not.

b.

The permittee shall routinely report the results of each biomonitoring test on the Table a forms provided with this permit.

I)

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 biomonitoring test results are due on or before April 20th, July 20th, October 2oth, and January 2oth, for biomonitoring conducted during the previous calendar quarter.

4)

Monthly biomonitoring test results are due on or before the 2oth day of the month following sampling.

c.

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

1)

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

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 "'" if the NOEC for growth is less than the critical dilution; otherwise, enter a "o."

Page 27

Attachment NOCAE-150032A8 SIT Nuclear Operating Company TPDES Permit No. w64ooo9otooo

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.

to)

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

ii)

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 for retests only:

I)

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

2)

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

4.

Persistent Toxicit.

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 between a specified endpoint (survival or growth) of the test organism in a specified effluent dilution when compared to the specified endpoint of the test orgatnism 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 growth at the critical dilution when compared to the growth 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 within 2o days of test completion. Test completion is defined as the last day of the test.

b.

If the retests are performed due to a demonstration of significant lethality, and 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. 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 i.e., the permittee shall return to a quarterly testing frequency for that species.

Page 28

Attachment NQC-AE-1 50032_48 STP Nuclear Operating Company TPDES Permit No.

Q0o019oo 0oo

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 neither test demonstrates significant lethality, the permittee shall continue testing at the quarterly frequency.

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 retest that demonstrates significant lethality, or within 45 days of being so instructed due to multiple toxic events, the permittee shall submit a General Outline for initiating a Toxicity Reduction Evaluation (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 effluent data available for review, a sampling and analytical schedule, and a proposed TRE initiation date.

b.

Within 9o days of the retest that demonstrates significant lethality, or within 90 days of being so instructed due to multiple toxic events, 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 TRE is a step-wise investigation combining toxicity testing with physical and chemical analysis to determine actidns necessary to eliminate or reduce effluent toxicity to a level not effecting significant lethality at the critical dilution. The TIE Action Plan shall describe an approach for the reduction or elimination of lethality for both test species defined in item t.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 alternative approaches. When conducting characterization analyses, the permittee shall perform multiple characterizations and follow the procedures specified in the document entitled, "Methods for Aquatic Toxicity Identification Evaluations: Phase I Toxicity Characterization Procedures" (EPA/6oo/6-91/oo3), 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/6oo/R-92/o8o) and "Methods for Aquatic Toxicity Identification Evaluations, Phase III Toxicity Confirmation Procedures for Samples Exhibiting Acute and Chronic Toxicity" (EPA/6oo/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 procedures, and chemical-specific analyses when the toxicity tests show significant lethality. Where the permittee has identified or suspects specific pollutant(s) and source(s) of effluent toxicity, the permittee shall conduct, concurrent with toxicity testing, Page 29

Attachment

!Q9

-AE-1 5003?148 STM Nuclear Operating Company TPDES Permit No. M 00019o 000 chemical-specific analyses for the identified and suspected pollutant(s) and 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, spikes, 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.

d.

The permittee shall submit quarterly TRE Activities Reports concerning the progress of the TRE. The quarterly reports are due on or before April 2oth, July 2oth, October 2o0h, and January 2oth. The report shall detail information regarding the TRE activi-ties including:

1) results and interpretation of any chemical-specific analyses for the identified and 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 substantiating documentation which identifies the pollutant(s) and 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 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 t.b.

f.

If the effluent ceases to effect significant lethality 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 1a 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.

Page 30

Attachment NOC-AE-15003248 STP Nuclear Operating Company TPDES Permit No. WQooo19ot0ooo This provision accommodates 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" are herein defined as proactive efforts that eliminate or reduce effluent toxicity. These include, but are not limited to, source reduction or elimination, improved housekeeping, changes in chemical usage, and modifications of influent streams and 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 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 permittee 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/TRE. The report shall provide information pertaining to the specific control mechanism(s) selected that will, when implemented, result in reduction of effluent toxicity to no significant lethality 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 to specify CS limits.

Page 31

Attachment

-AE-15003248 TPDES Permit No. W6ooo19otsooo STP Nuclear Operating Company TABLE i (SHEET 1 OF 4)

MYSID SHRIMP SURVIVAL AND GROWTH Date Time No. i FROM:

TO:

Date Time Dates and Times Composites Collected No. 2 FROM:

TO:

No. 3 FROM:

TO:

Test initiated:

am/pm date Dilution water used:

Receiving water Synthetic dilution water MYSID SHRIMP SURVIVAL

..,.../

_ %¢,

"s-

• l* *.

tr...

s...

I

• .* ::p * :::

• ~

~ ~.a*

v,

, r

..,. e u, r. *,

• {* * - - -*

1

.% :t' V % *.- ?..??

I................

_-_-_-_--_-5_.._.__........

CV%...

ffl

.e.t "F

i 71

• "7777 7.:..-.:......-..:.:....:.....

., ~................I tA.-' %

i iiII II

• .:i..:.:::..: : :.:. :. ::. ':.:. ::::: ::.::

-.:. : :,*i....

,,,L:,,: '*.*

1.

• Coefficient of Variation =standard deviation x 100/mean DATA TABLE FOR GROWTH OF MYSID SHRIMP

.. ~~~~ ~

M...

... ean. dry we t in m'lg As B b E T O....

. ~

.. B....

_~ i

Z I 1 l h

_B..

Page 32

Attachment

• ,-AE-1 50032_48 STP Nuclear Operating Company TPDES Permit No. R 00o019o50oo TABLE 1 (SHEET 2 OF 4)

MYSID SHRIMP SURVIVAL AND GROWTH DATATABLE FOR GROWTH OF MYSID SHRIMP (Continued)

• ~ ~ ~

~ ~ ~ ~ ~

I..

.. :-:)... :..

A m....

meaifdry :w-eight -in mil] gaxms in replicap habr L :..

.).

,V ý.....*:**i!.(

.:.i:.*::..

IL:.,

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 than the control survival for the % effluent corresponding to lethality?

CRITICAL 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 than the control's dry weight (growth) for the % effluent corresponding to non-lethal effects?

CRITICAL 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 33

Attachment P E Pe mAtE-1 5003N_48 TPDES Permit No. w0oo19otsooo STP Nuclear Operating Company TABLE 1 (SHEET 3 OF 4)

INLAND SILVERSIDE MINNOW LARVAL SURVIVAL AND GROWTH TEST Date Time Date Time Dates and Times Composites Collected No. 1 FROM:

No. 2 FROM:

No. 3 FROM:

TO:

TO:

TO:

Test initiated:

am/pm date Dilution water used:

Receiving water Synthetic Dilution water INLAND SILVERSIDE SURVIVAL

.....I R e li at C h m b r Pernt 1APerentSuvivl r Man: Percent Surxival;

__________~......

j 4h4 h

d ys (I] _____

5 %..

7%

_1._

uent r13%7777:

[_

______________~~

~~

• Coefficient of Variation = standard deviation x ioo/mean Page 34

Attachment NCAE-1 5003248 TPDES Permit No. Wo0001908000 STP Nuclear Operating Company TABLE i (SHEET 4 OF 4)

INLAND SILVERSIDE LARVAL SURVIVAL AND GROWTH TEST INLAND SILVERSIDE GROWTH

".:..:-""...4.'..'.:..

7K Percet

[

hambrs m

r I"

? -.-..

.5... t :

erc..:e.nv**:::

D3.::::...:*

~~ ~

~

~

~

~

~

~

i".1; * +"".

Weffluets Weightrsredlra, r*unrsrdlra BRTCLDLUIN(3)

YESg NO__

0%IA

..S N

3.

5%... correspondi N.E./LO

.elow PS I

_ _ i

.0T 7

iI 7 3%_

______________________________[

__IL____

Weights. are fo.peevdlra, r

upeevdlra Du.et. Prcdr or Steel's. May.n RakTs.rWi..nRn SmTswt corhs resodn tor lrethality?,

r unreeve ara

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 duryvwighv(roth at 7 days significantly less than the control'srvva dory wh fleigt (rwhfothefletcorresponding to n-lethalieffcts CRITICAL 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 35

Attachment NOC-AE-1 5003248 STP Nuclear Operating Company TPDES Permit No. WQoooigo80ooo 24-HOUR ACUTE BIOMONITORING REQUIREMENTS; MARINE The provisions of this section apply to Outfall ool for WET testing.

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 Texas Surface Water Quality Standard, 30 TAC § 307.6(e)(2)(B), of greater than 50% survival of the appropriate test organisms in loo% 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 tdition (EPA-821-R-o2-o12) or its most recent update:

1)

Acute 24-hour static toxicity test using the mysid shrimp (Americamysis 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.

A valid test result must be submitted for each reporting period. The permittee must report, then repeat, an invalid test during the same reporting period. The repeat test shall include the control and all effluent dilutions and use the appropriate number of organisms and replicates, as specified above. 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.

c.

In addition to an appropriate control, a ioo% effluent concentration shall be used in the toxicity tests. Except as discussed in item 2.b., the control and dilution water shall consist of standard, synthetic, reconstituted seawater.

d.

This permit may be amended to require a WET limit, a BMP, a CS limit, additional toxicity testing, and other appropriate actions to address toxicity. The permittee may be required to conduct a Toxicity Reduction Evaluation after multiple toxic events.

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 1.c., the control and dilution water shall consist of a standard, synthetic, reconstituted seawater.

c.

Samples and Composites I)

The permittee shall collect one composite sample from Outfal ool.

2)

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

Page 36

Attachment WOC-AE-1 5003248 STP Nuclear Operating Company TPDES Permit No. W1ooo9ooo000

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 composite sample. Samples shall be maintained at a temperature of o-6 degrees Centigrade during collection, shipping, and storage.

4)

If Outfall ool 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 collebted 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.

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 Standards Implementation Team (MC 150) of the Water Quality Division.

a.

The permittee shall prepare a full report of the results of all tests conducted in accordance with the manual referenced above, or its most recent update, for every valid and invalid toxicity test initiated.

b.

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

1)

Semiannual biomonitoring test results are due on or before January 2oth and July 2oth for biomonitoring conducted during the previous 6 month period.

2)

Quarterly biomonitoring test results are due on or before January 2oth, April 2oth, July 2oth, and October 2oth, for biomonitoring conducted during the previous calendar quarter.

c.

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

I)

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

2)

For the inland silverside, Parameter TIE6B, enter a "o" if the mean survival at 24-hours is greater than 5o% in the loo% effluent dilution; if the mean survival is less than or equal to 5o%, enter a "1."

d.

Enter the following codes for retests only:

I)

For retest number a, Parameter 22415, enter a "o" if the mean survival at 24-hours is greater than 5o% in the aoo% effluent dilution; if the mean survival is less than or equal to 5o%, enter "i."

2)

For retest number 2, Parameter 22416, enter a "0" if the mean survival at 24-hours is greater than 50% in the aoo% effluent dilution; if the mean survival is less than or equal to 5o%, enter "1."

Page 37

Attachment I.-AE-15003Z,48 SIT Nuclear Operating Company TPDES Permit No. wbtooo19o6ooo

4.

Persistent Mortality 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 ioo% effluent concentration after 24-hours.

a.

The permittee shall conduct 2 additional tests (retests) for each species that demonstrates significant lethality. The two retests shall be conducted once per week for 2 weeks. Five effluent dilution concentrations in addition to an appropriate control shall be used in the retests. These additional effluent concentrations are 6%, 13%, 25%,

5o% and ioo% 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.

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.

Toxicity Reduction Evaluation

a.

Within 45 days of the retest that demonstrates significant lethality, the permittee shall submit a General Outline for initiating a Toxicity Reduction Evaluation (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 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 THE. A TRE 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:

i)

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 alternative approaches. When conducting characterization analyses, the permittee shall perform multiple characterizations and follow the procedures specified in the document entitled, "Methods for Aquatic Toxicity Identification Evaluations: Phase I Toxicity Characterization Procedures" (EPA/6oo/6-91/oo3), 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/6oo/R-92/o8o) and "Methods for Aquatic Toxicity Identification Evaluations, Phase III Toxicity Confirmation Procedures for Samples Exhibiting Acute and Chronic Toxicity" (EPA/6oo/R-92/o8i). All characterization, identification, and confirmation tests shall be conducted in an orderly and logical progression; Page 38

Attachment C-AE-15003Z48 ST? Nuclear Operating Company TPDES Permit No. W'Qooo19o0io0o

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 source(s) of effluent toxicity, the permittee shall conduct, concurrent with toxicity testing, chemical-specific analyses for the identified and suspected pollutant(s) and 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, spikes, 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 3o days of submittal of the TRE Action Plan and Schedule, the permittee shall implement the TRE.

d.

The permnittee shall submit quarterly TRE Activities Reports concerning the progress of the THE. The quarterly TRE Activities 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 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 substantiating documentation that identifies the pollutant(s) and source(s) of effluent toxicity;

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

5) any data that 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 i.b..

Page 39

Attachment

• IQGAE-1 50032_48 STP Nuclear Operating Company TPDES Permit No. W4 ooo19o50 o0o

f.

If the effluent ceases to effect significant lethality 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 weeldy 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 accommodates 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" are herein defined as proactive efforts which eliminate or reduce effluent toxicity. These include, but are not limited to, source reduction or elimination, improved housekeeping, changes in chemical usage, and modifications of influent streams and 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 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 18-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/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 5o% survival of the test organism in ioo% 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/TRE and must prove that circumstances beyond their control stalled the TIE/TRE.

The requirement to comply with 30 TAC § 307.6(e)(2)(B) may be exempted upon proof that toxicity is caused by an 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 to specify a CS limit.

Page 40

Attachment TPDES Permit No. V"M"*Moioo STP Nuclear Operating Company TABLE 2 (SHEET i OF 2)

MYSID SHRIMP SURVIVAL GENERAL INFORMATION PERCENT SURVIVAL 7

÷.-...

i::: !::::.

!::::: 6 % ::!::.:

3 :

2 5 i ~ % *:ii:*

o.-....

i ~

~

~

~ ~ ;.i j:A-ii:ii!i!: !i..............

M:"".

....... I'....

¢

..,I.

.,. *, '....o*:*

:..:W *:':* :.:.':': :i':-*'-:'*!':]

v.

~~~..

ii iii!:i

• +..

~~~~~.

.6:

j.

Enter percent effluent corresponding to the LC5o below:

24 hour2.777778e-4 days <br />0.00667 hours <br />3.968254e-5 weeks <br />9.132e-6 months <br /> LC5o =

% effluent Page 41

Attachment N-AE-1 5003248 TPDES Permit No. W6ooo1908000 STP Nuclear Operating Company TABLE 2 (SHEET 2 OF 2)

INLAND SILVERSIDE SURVIVAL GENERAL INFORMATION "F-fl-SM

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7 IL r77777777 Enter percent effluent corresponding to the LC5o below:

24 hour2.777778e-4 days <br />0.00667 hours <br />3.968254e-5 weeks <br />9.132e-6 months <br /> LC5o effluent Page 42