ML20217F278

Mod to NPDES Permit SC0030856,issued to Sce&G Vsns

ML20217F278
Person / Time
Site:	Summer
Issue date:	04/01/1998
From:	Sadler M SOUTH CAROLINA, STATE OF
To:
Shared Package
ML20217F276	List: ML20217F278 RC-98-0057, Forwards Copy of Mod to Vsns NPDES Permit SC0030856.Rev Was Approved by Sc Dept of Health & Environ Control on 980224
References
SC0030856, SC30856, NUDOCS 9803310333
Download: ML20217F278 (79)

Text

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South Carolina Depanment of Health and Environmental Control NationalPollutant Discharge Elimination System Pennit for Discharge to Surface Waters This Permit Certifies That SCE&G Virgil C. Summer Nuclear Station has been granted permission to discharge from a facility located at Jenkinsville, Fairpeld County, South Carolina to receiving waters named 1

Monticello Reservoir and Broad River accordance with effluent limitations, monitoring requirements and other conditions set forth in Parts I, II, and III hereof. This permit is issued in accordance with the provisions of the Pollution Control Act of South Carolina (S.C. Code Secdons 48-1-10 et seq.,1976), Regulation 61-9 Eal with the provisions of the Federal Clean Water Act (PL 92-500), as amended, 33 U.S.C.1251 et seq., the "Act."

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Marion F. Sadlef, Jr., Dire 6 tor Industrial, Agricultural, and Storm Water Permitting Division Bureau of Water Issued: September 29,1997 Expires: September 30, 2002 Effective: October 1,1997 Permit No.:SC0030856 p 9803310333 980324 j

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Part I L Page 19 of 34 l Permit No. SC0030856 C. SCHEDULE DF COMPLIANCE i

~1. The permittee shall achieve compliance with the effluent limitations specified for discharges in accordance with the following schedules:

l N/A

2. No later than 14 calendar days following a date identified in the above schedule of compliance, the permittee shall submit either a report of progress or.. in the case of specific actions being required by identified dates, a written notice of compliance or noncompliance. In the latter case, the notice shall include the cause of noncompliance, any remedial actions taken, and the probability of meeting the next scheduled requirement.

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Part I Page 20 of 34 Permit No. SC0030856 D. MONITORING AND REPORTING

1. Representative Sampling Samples and measurements taken as required herein shall be representative of the volume and nature of the' monitored discharge.

2. Flow Measurements Appropriate flow measurement devices and methods consistent with accepted scientific practices shall be present and used to ensure the accuracy and reliability of measurements of the volume of monitored discharges. The devices shall be installed.

calibrated and maintained to ensure that the accuracy of the measurements are consistent with the accepted capability of that type of device. Devices selected shall be capable of measuring flows with a maximum deviation of less than 10% from the true discharge rates throughout the range of expected discharge volumes. The primary flow device must be accessible to the use of a continuous flow recorder. Where a fiume is aresent, a separate stilling well for Department / EPA use must be provided if required Jy the Department.

3. Reporting Monitoring Results

a. Monitoring results obtained each month shall be reported monthly on a Discharge Monitoring Report Form (EPA Form 3320-1). The first report is due postmarked no later than the 28th day of the month following the month this permit becomes effective. Two copies of these, and all other reports required herein, shall be submitted to the Department:

S.C. Department of Health and Environmental Control Bureau of Water ATTN: Compliance Assurance Division 2600. Bull Street Columbia, South Carolina 29201

b. Groundwater monitoring results must be reported on a Groundwater Monitoring Report Form (DHEC 2110) postmarked no later than the 28th day of the month following the completed reporting period. Two copies of the reports shall be submitted to the Department:

S.C. Department of Health and Environmental Control Bureau of Water ATTN: B0W/ Compliance Assurance Division 2600 Bull Street Columbia. South Carolina 29201

4. Test Procedures Test procedures for the analysis of pollutants shall conform to regulations published pursuant to State Environmental Laboratory Certification Regulation 61-81 and S.ection 304(h) of the Act, as amended. (Federal Register. October 16.1973: Title 40. Chapter I. Sub-chapter D. Part 136 " Guidelines Establishing Test Procedures for the Analysis of Pollutants." Amended by Federal Register. December 1.1976, and any other amendments that may be promulgated).

5. Recording of Results

. - n,.w w w; u.-

Part I Page 21 of 34 Permit No.' SC0030856 For each measurement or sample taken pursuant to the requirements of this permit. the permittee shall record the following information:

a. the exact pla.ce. date and time of sampling:

b. the dates and times the analyses were performed:

c. the person (s) who where applicable; performed the analyses and the laboratory certification number

d. the analytical techniques or methods used: and

e. the results of all required analyses.

6. 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 herein, the results of such monitoring shall be included in the calculation and reporting of the values required in the Discharge Monitoring Report Form (EPA-3320-1).

Such increased frequency shall also be indicated. Additional or accelerated monitoring may be required to determine the nature and impact of a non-complying discharge on the environment or to determine if a single non-complying sample is representative of the long term condition (monthly average).

7. Records Retention All records and information resulting from the monitoring activities required by this permit including all records of analysis performed and calibration and maintenance of instrumentation and recordings from continuous monitoring instrumentation shall be retained.for a minimum of three (3) years, or longer if requested by the Department.

The permittee shall furnish to the Department, upon request. copies of records required to be kept by this permit.

8. Definitions

a. The " monthly average", other than for fecal coliform, is the arithmetic mean of all samples collected in a calendar month period. The monthly average for fecal coliform bacteria is the geometric mean of all samples collected in a calendar month period. The monthly average loading is the arithmetic average of all individual loading determinations made during the month.

b. " Weekly average", other than for fecal coliform. is the arithmetic mean of all the samples collected during a one-week' period. The weekly avera coliform is the geometric mean of all samples collected during a onege for fecal week period.

For self-monitoring purposes, weekly periods in a calendar month are defined as three (3) consecutive seven day intervals starting with the first day of the calendar month and a fourth interval containing seven (7) days plus those days beyond the 28th day in a calendar month. The value to be reported is the single highest of the four (4) weekly averages computed during a calendar month. The weekly average loading is the arithmetic average of all individual loading determinations made during the week.

c. " Daily maximum" is the highest average value recorded of samples collected on any

l Part I I Page 22 of 34 Permit No. SC0030856 single day during the calendar month.

d. The " instantaneous maximum or minimum" is the highest or lowest value recorded of all samples collected during the calendar month.

e. The "arithmet'ic mean" of any set of values is the summation of the individual valces divided by the number of individual values,

f. The " geometric mean" of any set of values is the Nth root of the product of the individual values where N is equal to the number of individual values. The geometric mean is equivalent to the antilog of the arithmetic mean of the logarithms of the individual values. For purposes of calculating the geometric mean, values of zero (0) shall be considered to be one (1).

g. The " Department" shall refer to the South Carolina Department of Health and Erivironmental Control.

l

h. The "Act" shall refer to the Clean Water Act (Formerly referred to as the Federal Water Pollution Control Act) Public Law 92-500, as amended.

~

1. A " grab sample" is an individual discrete or single influent or effluent portion of at least 100 milliliters collected at a time representative of the discharge and over a period not exceeding 15 minutes and retained separately for analysis.

Instantaneous flow measured at the time of grab sample collection shall be used to calculate quantity.

j. A " composite sample" shall be defined as one of the following four types:

(1) An influent or effluent portion collected continuously over a specified period of time at a rate proportional to the flow.

(2). A combination of not less than 8 influent or effluent grab samples collected at regular (equal) intervals over a specified period of time and composited by increasing the volume of each aliquot in pro)ortion to flow.

If continuous flow measurement is not used to composite n proportion to flow, the following method will be used: An instantaneous flow measurement should be taken each time a grab sample is collected. At the end of the sampling period, the instantaneous flow measurements should be summed to obtain a total flow. The instantaneous flow measurement can then be divided by the total flow to determine the percentage of each grab sample to be combined. These combined samples form the composite sample.

(3) A combination of not less than 8 influent or effluent grab samples of equal volume but at variable time intervals that are inversely aroportional to the volume of the flow. ,In other words, the time interval 3etween aliquots is reduced as the volume of flow increases.

(4) A combination of not less than B influent or effluent grab samples of constant (equal) volume, proportional to flow. collected at regular (equal) time intervals over a specified period of time.

l All samples shall be properly preserved in accordance with Part I.C.4. Continuous flow or the sum of instantaneous flows measured and averaged for the specified compositing time period shall be used with composite sample results to calculate quantity.

_1

.' 4 Part I Page 23 of 34 Permit No. SC0030856

9. Right of Entry The permittee shall allow the Commissioner of the Department of Health and Environmental Control, the Regional Administrator of EPA. and/or their authorized representatives:

a. To enter upon the permittee's premises where a regulated facility or activity and effluent source is located in which any records are required to be kept under the terms and conditions of this permit, and,

b. At reasonable times to have access to and copy any records required to be kept under the terms and conditions of this permit: to inspect any facilities, equipment (including monitoring and control equipment), practices or operations regulated or required under this permit and sample or monitor any substances or parameters at any location of the purposes of assuring permit compliance.

e A

Part II  :

Page 24 of 34 Pennit No. SC0030856

{

PART II A. GENERAL REQUIREMENTS

1. Duty to Comply The sermittee must comply with all conditions of this permit. Any permit non-compliance constitutes a violation of the Act and the S.C. Pollution Control Act and is grounds for enforcement action: for permit termination, revocation and reissuance, or modification: or for the denial of a permit renewal application.

2. Civil and Criminal Liability

a. Any person who violates a term, condition or schedule of compliance contained 1 within this permit is subject to the actions defined by Sections 48-1-320 and 48-1-330 of the S.C. Pollution Control Act.

b. Except as provided in permit conditions on " Bypassing" (Part II.C.2.), nothing in this permit shall be construed to relieve the permittee from civil or criminal penalties for non-compliance.

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

d. It is the res onsibility of the permittee to have a treatment facility that will meet the final effluent limitations of this permit. The approval of plans and specifications by the Department does not relieve the permittee of responsibility for compliance.

3. Oil and Hazardous Substance Liability Nothing in this permit shall be construed to preclude the institution of any legal action or relieve the permittee from any responsibilities, liabilities, or penalties to which the permittee is or may be subject to under Section 311 of the Act, the S.C.

Pollution Control Act or applicable provisions of the S.C. Hazardous Waste Management Act and the S.C. Oil and Gas Act.

4. Permit Modification

a. The permittee shall furnish to the Department within a reasonable time any relevant information which the Department may request to determine whether cause exists for modifying, revoking and reissuing, or terminating the permit, or to determine compliance with the permit.

b. Upon sufficient cause. this permit may De modified, revoked, reissued, or terminated during its term, after public notice and opportunity for a hearing. '

Modifications deemed to be minor will not require public notice.

c. The filing of a request by the permittee for a permit modification. or a notification of planned changes or anticipated non-compliance. does not stay any permit condition.

5. Toxic Pollutants Notwithstanding Part II.A.4. above if a toxic effluent standard or prohibition o

Part 11 Page 25 of 34 Pennit No. SC0030856 (including any schedule of compliance specified in such effluent standard or prohibition) is established under Section 307(a) of the Act for a toxic pollutant which is present in the discharge and such standard or prohibition is more stringent than any limitations for such pollutant in this permit, this permit shall be revised or modified in accordance with the toxic effluent standard or prohibition and permittee 50 notified.

6. State Laws Nothing in this permit shall be construed to preclude the institution of any legal action or relieve the permittee from any responsibilities liabilities, or penalties established pursuant to any applicable State law or regulation under authority preserved by Section 510 of the Act.

7. Property Rights The issuance of this permit does not convey any property rights in either real or personal property or any exclusive privileges, nor does it authorize any injury to private property or any invasion of personal rights, nor any infringement of Federal.

State or local laws or regulations.

8. Severability The provisions of this permit are severable, and if any provisions of this permit or the application of any provision 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.

9. Oashore and Offshore Construction This permit does not authorize or approve the construction of any onshore or offshore physicalsstructures or facilities or the undertaking of any work in any navigable waters.

B. REPORTING REQUIREMENTS

1. Change in Discharge All discharges authorized herein shall be consistent with the terms and conditions of this permit. The discharge of any pollutant identified in this permit more frequently than or at a level in excess of that authorized shall constitute a violation of the permit. Any planned facility expansions, production increases, or process ,

modifications wh:ch will result in a new or different discharge of pollutants must be l reported by submission of a new NPDES application or, if such changes will not violate I the effluent limitations specified in this permit, by notice to the Department of such changes. Following such notice, the permit may be modified to specify and limit any pollutant not previously limited.

2. Twenty-Four Hour Non-Compliance Reporting

a. The permittee shall report any non-compliance with provisions specified in this

! permit which may endanger )ublic health or the environment. The permittee shall notify the Department orally 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 such conditions.

During normai working hours call 803/734-5300. After hour reporting should be I made to the 24 hour2.777778e-4 days <br />0.00667 hours <br />3.968254e-5 weeks <br />9.132e-6 months <br /> Emergency Response telephone number 803/253-6488. The

f Part 11 Page 26 of 34 t

Permit No. SC0030856 l

permittee shall provide the following information to the Department in writing, within five (5) days of becoming aware of such conditions:

(1) A description of the discharge and cause of non-compliance; and.

(2) The period of non-compliance, including exact dates and times; or, if not corrected, the anticiaated time the non-compliance is expected to <

l l continue, and steps seing taken to reduce, eliminate and prevent l recurrence of the non-complying discharge. .

b. The following violations shall be included in a 24 hour2.777778e-4 days <br />0.00667 hours <br />3.968254e-5 weeks <br />9.132e-6 months <br /> report when they might endanger health or the environment:

(1) An unanticipated bypass which exceeds any effluent limitation in this permit:

(2) Any upset which exceeds any effluent limitation in the permit.

c. As soon as the permittee has knowledge of or anticipates the need for a bypass, but not later than 10 days before the date of the bypass, it shall notify the Department and provide a determination of the need for bypass as well as the anticipated quality. quantity, time of duration, and effect of the bypass.

3. Other Non-Compliance The permittee shall report in narrative form, all instances of non-compliance at the time Discharge Monitoringnot previously reported under Section B. Paragraph B.2. i Reports are submitted. The reports shall contain the information listed in Paragraph J B.2.a.

4. Transfer of Ownership or Control A permit may be transferred to another party under the following conditions: l t

The permittee notifies the Department of the proposed transfer at least thirty a.

(30) days in advance of the proposed transfer date: )

J A written agreement is submitted to the De)artment between the existing and new j

b. >

permittee containing a specific date for tie transfer of permit responsibility.

coverage, and liability for violations up to that date and thereafter.

Transfers are not effective if, within 30 days of receipt of proposal, the Department disagrees and notifies the current permittee and the new permittee of the intent to modify, revoke and reissue, or terminate the permit and to require that a new application be filed.

5. Expiration of Permit The permittee is not authorized to discharge after the expiration date of this permit, t unless a completed application for reissuance is submitted no later than 180 days prior to the ' expiration date. Permission may be granted to submit an application later than this, but not later than the expiration date of the permit. In accordance with Section 1-23-370 of the Code of Laws of South Carolina, if a timely and sufficient application is made for any activity of a continuing nature, the existing permit does not expire until a final determination is made to renew or deny renewal of the existing permit.

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, .' l

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l l

l Part Il  !

Page 27 of 34  !

l Pennit No. SC0030856

6. Signatory Requirements All applications. reports or information submitted to the Department shall be signed and certified.

I

a. All permit applications shall be signed as follows:

(1) For a corporation: by a principal executive officer of at least the level of vice-president or by a duly authorized representative:

(2) For a partnership or sole by a general partner or I

proprietor, respectively; or. proprietorship:

(3) For a municipality, State Federal or other public agency: by either a principal executive officer or ranking elected official.

b. All reports ' required by the permit and other information requested by the Department shall be signed by a person described above or by duly authcrized .

representation only if. l (1) The authorization is made in writing by a person described above and submitted to the Department:

(2)  !

The authorization specifies either an individual or a position having  !

responsibility for the overall operation of the regulated facility or activity, such as the position of plant manager, superintendent, or position of equivalent responsibility. (A duly authorized representative may thus be either a named individual or any individual occupying a named position.) l

7. Availability of Reports  !

Except f6r data determined to be confidential under Section 48-1-270 of the S.C.

Pollution Control Act, all reports prepared in accordance with the terms and conditions of this permit shall be available for public inspection at the offices of the Department and the Regional Administrator. As required by the Act, effluent data shall ,

not be considered confidential. Knowingly making any false statement on any such report may result in the imposition of criminal penalties as provided for in Section 48-1-340 of the S.C. Pollution Control Act.

8. Changes in Discharges of Toxic Pollutants or Hazardous Substances

a. The permittee shall notify the Department as soon as it knows or has reason to believe that any activity has occurred or will occur which would result in the discharge in any outfall of:

(1) Any toxic pollutant (s) identified under Section 307(a) of the Act which exceed the highest of the following concentrations and are not limited in the permit.

1 mg/l for antimony (Sb):

0.500 mg/l for 2,4-dinitrophenol or 2-methyl-4,6-dinitrophenol:

0.200 mg/l for acrolein or acrylonitrile:

Part 11 Page 28 of 34 ,

1 Permit No. SC0030856

- 0.100 mg/l for any other toxic pollutant; or.

- Ten (10) times the maximum concentration value reported in the permit application.

(2) Any hazardous substance (s) identified under Section 311 of the Act as determined by Federal Regulation 40 CFR 117.

I

b. The permittee must notify the Deparhnt as soon as it knows or has reason to believe that it has begun or expec~ to begin to use or manufacture as an intermediate or final product or by-product any toxic pollutant or hazardous substance which was not reported in the permit application.

C. OPERATION AND MAINTENANC2

1. Facilities Operation

a.  !

The systemspermittee shall atcontrol of treatment.and all times p(roperly operate and maintain all faciliti '

or used by the permittee to achieve compliance with the conditions of this permit.

Proper operation and maintenance includes effective performance based on design facility removals, adequate funding, adequate operator staffing and training, and adequate laboratory and process controls as determined by the laboratory certification program of the Department. This provision requires the operation of back-up or auxiliary facilities or similar systems only when necessary to

- achieve compliance with the conditions of the permit. Maintenance of facilities, which necessitates unavoidable interruption of operation and degradation of effluent quality shall be scheduled during non-critical water quality periods and carried out in a manner approved by the Department.

b. The. permittee shall provide for an operator, as certified by the South Carolina Board of Certification for Environmental Systems Operators, with a grade equal to or higher than the classification designated in Part III.3. The name and grade of the operator of record shall be submitted to the Department prior to placing t the facility into operation. A roster of operators associated with the facility's operation and their certification grades shall also be submitted with the name of the " operator-in-charge" Any changes in operator or operators shall be submitted to the Department as they occur..

-2. Bypassing .

)

Any intentional diversion from or bypass of waste streams from any  !

portion of wastewater collection and treatment facilities which is not a designed or established operating mode for the facility is prohibited except (a).where unavoidable to prevent loss of life, personal injury,or severe pro >erty damage, or (b) where excessive storm drainage or run-off would damage 1 any facili;ies necessary for compliance with the effluent limitations and prohibitions of this permit and there were no feasible alternatives to the bypass. such as the use of auxiliary treatment facilities or retention of untreated wastes.

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" Severe property damage" does not mean economic loss caused by delays in production.

3. Duty to Mitigate. Halt or Reduce Activity The permittee shall take all reasonable steps to prevent, minimize or correct any adverse impact on public health or the environment, resulting from non-compliance with

Part II Page 29 of 34 Permit No. SC0030856 this permit. Upon reduction, loss, or failure of the treatment facility, the permittee shall, to the extent necessary to maintain compliance with this permit, control production or all discharges or both until the facility is restored or an alternative-method of treatment is provided.

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4. Power Failures In order to maintain compliance with effluent-limitations and prohibitions of this permit, the permittee shall either:

a. In accordance with the Schedule of Compliance contained in Part I.B., provide an alternative power source sufficient to operate the wastewater control facilities:

or, if such alternative aower source is not in existence, and no date for its implementation appears in Dart I.B., have a plan of operation which will:

b. Halt, reduce, or otherwise control production and/or all discharges upon the reduction, loss, or failure of the primary source of power to the wastewater control facilities.

5. Removed Substances Solids, sludges, filter backwash or other residuals removed in the course of treatment or control of wastewaters shall be disposed of in a manner such as to prevent such materials from entering State waters and in accordance with guidelines issued pursuant to Section 405 of the Act, and the terms of a construction or NPDES and/or solid or hazardous waste permit issued by the Department, .

Part III i Page 30 of 34 j Permit No. SC0030856 Part III A. OTHER REQUIREMENTS

1. The permittee shall maintain at the permitted facility a complete Operations and Maintenance Manual for the waste treatment plant. The manual shall be made available {

for on-site review during normal working hours. The manual shall contain operation and maintenance instructions for all equipment and appurtenances associated with the waste treatment plant. The manual shall contain a general description of the treatment process (es), operating characteristics that will produce maximum treatment efficiency, and corrective action to be taken should operating difficulties be encountered.

2. The permittee shall provide for the performance of routine daily treatment plant inspections by a certified operator of the appropriate grade as defined in Part II.C.1.

The inspection shall include, but is not limited to, areas which require a visual observation to determine efficient operations and for which immediate corrective measures can be taken using the 0 & M manual as a guide. All inspections shall be recorded and shall include the date, time and name of the person making the inspection.

corrective measures taken, and routine equipment maintenance, repair, or replacement performed. The permittee shall maintain all records of ins)ections at the permitted facility as required by Part I.C.7., and the records shall ]e made availabic for on-site review during normal working hours.

3. The wastewater treatment plant has been assigned a classification of Group III-Bio in the Permits to Construct which are issued by the Department. This classification corresponds to an operator with a Grade of P Bio or higher.

4. The permittee shall maintain an all weather access road to the wastewater treatment plant and appurtenances at all times.

5. The permittee shall continue to maintain a Best Management Practices (BMP) plan to identify and control the discharge of significant amounts of oils and the hazardous and toxic substances listed in 40 CFR Part 117 and Tables II and III of Appendix D to 40 CFR Part 122. The plan shall include a listing of all potential sources of spills or leaks of these materials, a method for containment, a description of training, inspection and security procedures, and emergency response measures to be taken in the event of a discharge to surface waters or plans and/or procedures which constitute an equivalent BMP. Sources of such discharges may include materials storage areas: in- {

plant transfer, process and material handling areas: loading andThe unloading BMP planoperations; shall be plant site runoff; and sludge and waste disposal areas. 4 developed in accordance with good engineering practices, shall be documentedThe in narrative form, and shall include any necessary plot plans, drawings, or maps.

BMP plan shall be maintained at the plant site and shall be available for inspection by EPA and Department personnel.

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

7. The permittee shall monitor all parameters consistent with conditions established by this permit in accordance with the sampling plan to be submitted by the permittee.

unless otherwise approved by this Department. Additional monitoring, as necessary to meet the frequency requirements of this permit (Part I.A. Effluent Limitations and Monitoring Requirements) shall be performed by the permittee. )

8. Unless authorized elsewhere in this permit the permittee shall meet the following once-requirements concerning maintenance chemicals for the following waste streams:

through noncontact cooling water, recirculated cooling water boiler blowdown, cooling

.mmm . ,

Part III Page 31 of 34 Pennit No. SC0030856 tower blowdown, and air washer water.

Maintenance chemicals shall be-defined as any man-induced additives to the above-referenced waste streams. This includes materials added for corrosion inhibition including zinc. chromium, and phosphorus.

a. The discharge, in detectable amounts, of any of the one hundred and twenty-six priority pollutants is prohibited if the pollutants are present due to the use of maintenance chemicals.

b. Slimicides, algicides and biocides shall be used in accordance with registration requirements of the Federal Insecticide. Fungicide and Rodenticide Act.

c.

f The use of maintenance chemicals containing bis (tributyltin) oxide is prohibited unless written approval is obtained from SCDHEC.

d. Any maintenance chemicals added to the above referenced waste streams must degrade rapidly, either due to hydrolytic decomposition or biodegradation.

e. The discharge of maintenance chemicals added to waste streams must be limited to concentrations which protect indigenous aquatic populations in the receiving stream and shall not exceed the "no observed effect level (NDEL)".

The permittee shall keep sufficient documentation on-site which support that the above requirements are being met. The information shall be made available for on-site review by Department personnel during normal working hours. The occurrence of in-stream problems may necessitate the submittal of chemical additive data and may require a permit modification to include additional monitoring and limitations. The permittee may demonstrate compliance with these limitations to the South Carolina Department of Health and Environmental Control by either sampling and analyzing for the pollutants in the discharge or providing mass balance calculations to demonstrate that use of particular maintenance chemicals will not result in detectable amounts of the toxic pollutants in the discharge.

9; The company shall notify the South Carolina Department of Health and Environmental Control in writing no later than sixty (60) days prior to instituting use of any additional maintenance chemicals in the cooling water system.

Such notification shall include:

1

1. Name and general composition of the maintenance chemical l

2. Quantities to be used

3. Frequency of use

4. Proposed discharge concentration

5. EPA registration number if applicable

6. Aquatic toxicity information

10. All sludges, waste oil and solid and hazardcas waste shall be properly disposed of in accordance with the rules and regulations of the Bureau of Solid and Hazardous Waste Management, including the intake screen backwash. Within ninety (90: days of the permit effective date, the permittee shall submit a )lan which details the sludge and solids management and disposal at this facility for review ant )ractices including tie chemical metal cleaning sludge approval.

Part III Page 32 of 34 Permit No. SC0030856 l

11. The permittee shall maintain at the permitted facility a record of the method (s) used in measuring the discharge flow:

Estimate - Pump Curve. Production Chart. Water Use Records Instantaneous - Bucket and Watch. Weir and Gauge. Parshall Flume Continuous - Totalizer. Continuous Chart Recorder l Records of any necessary calibrations must also be kept. This information shall be made available for on-site review by Department personnel during normal working hours.

12. a. A three-brood chronic toxicity test shall be conducted using a control and the instream waste concentration (IWC) of 100% at Outfalls 001. 002, and 014. The test shall be performed at the frequencies indicated in Part I.A. The test shall be conducted using Ceriodachnia dubia as the test organism and in accordance with the most recent "Short-Term Methods for Estimating the Chronic Toxicity of Effluents and Receiv.ing Waters to Freshwater Organisms" (EPA /600/4-91/002) and

" South Carolina Procedures for Pass / Fail Modifications of the Ceriodachnia 48 hour5.555556e-4 days <br />0.0133 hours <br />7.936508e-5 weeks <br />1.8264e-5 months <br /> Acute Toxicity Test and Ceriodachnia Survival and Reproduction Test" (SCDHEC May 1989) or superseding document. Toxicity test results need to be reported on DHEC Form 3420. DMR Attachment for Toxicity Test Results", in accordance with Part 1(C)(3) of the permit. The test must be performed by a DHEC certified laboratory.

b. If the test results indicate a quarterly average of 20% reduction in reproduction or survival from the control or a single test exceeds 50%

the test reduction in reproduction or survival from the control group,ing period shall be deemed a failure. A minimum of one test per monitor must be conducted. If a test result exceeds the average limit an any

~

monitoring period, the permittee may conduct additional tests as j appropriate to better define the toxicity. Additional results shouldbe included in the average. A single exceedance of the maximum limit will be considered a violation.

13. a. A 48 hour5.555556e-4 days <br />0.0133 hours <br />7.936508e-5 weeks <br />1.8264e-5 months <br /> static acute toxicity test shall be conducted using a control and 100%

effluent at Outfall 012 at the frequency indicated in Part I.A. using a control and 100% effluent. The test shall be conducted using Ceriodachnia dubia as the test organism and in accordance with the most recent " Methods for Measuring the Acute Toxicity of Effluents to Freshwater and Marine Organisms" (EPA /600/4-90/027) or superseding document. Toxicity test results need to be reported on DHEC Form 3420."DMR Attachment for Toxicity Test Results", in accordance with Part I(C)(3) of the permit. The test must be performed by a DHEC certified laboratory. ,

b. If the test results indicate a monthly average of 20% reduction in survival from the control or a single test exceeds 50% reduction in survival from the control group, the test shall be deemed a failure. A minimum of one test per monitoring period must be conducted. If a test result exceeds the average limit in any monitoring period, the permittee may conduct additional tests as appropriate to better define the toxicity.

Additional results shouldbe included in the average. A single exceedance of the maximum limit will be considered a violation.

)

Part III Page 33 of 34 Permit No. SC0030856

14. The Permittee shall not store soil nor other similar erodible materials in a manner in which runoff is uncontrolled, nor conduct construction activities in a manner which produces uncontrolled runoff unless such uncontrolled runoff has been specifically approved by SCDHEC.

" Uncontrolled" shall mean without sedimentation basin or other controls approved by SCDHEC.

15. Upset - (1) Definition. "bpset" means an exceptional incident in which there is unintentional and temporary noncompliance with technology based permit effluent limitations because of factors beyond the reasonable control of the permittee. An upset does not include noncompliance to the extent caused by operational error.

improperly designed treatment facilities, inadequate treatment facilities, lack of preventive maintenance, or careless or improper operation.

(2) Effect of an upset. An upset constitutes an affirmative defense to an action brought for noncompliance with such technology based permit effluent limitation if the requirements of paragraph (3) of this section are met. No determination made during administrative review of claims that noncompliance was caused by upset, and before an action for noncompliance, is final administrative action subject to judicial review.

(3) Conditions necessary for a demonstration of upset. A permittee who wishes to establish the affirmative defense of u signed, contemporaneous operating logs,pset shall demonstrate, or other relevant through proper evidence that:

(1) An upset occurred and that the permittee can identify the cause(s) of the upset:

(ii) The permitted facility was at the time being properly operated; and (iii) The permittee submitted notice of the upset as required in paragraph Part II.B.2 of this permit (24 hour2.777778e-4 days <br />0.00667 hours <br />3.968254e-5 weeks <br />9.132e-6 months <br /> notice).

(iv) The permittee complied with any remedial measures required by Part II.C.3 of t1is permit (duty to mitigate).

(4) Burden of proof. In any enforcement proceeding, the permittee seeking to establish the occurrence of an upset has the burden of proof.

/

s Part 111 Page 34 of 34 Permit No. SC0030856

16. Discharge of any waste resulting from the combustion of chemical metal cleaning wastes, toxic wastes. or hazardous wastes to any waste stream which ultimately discharges to waters of the United States is prohibited, unless specifically authorized elsewhere in this permit.

17. The Water Quality-Based-Effluent Limitations (WOBEL) for the parameters listed are not quantifiable using EPA-approved analytical methods. Therefore, the Department has set forth a reporting threshold to measure the highest acceptable quantification level for these parameters. This reporting threshold does not authorize the discharge of any pollutant in excess of the WOBEL.

a. For aurposes of reporting, the Permittee shall use the reporting threshold equivalent to tie detection limit listed below and conduct analyses in accordance with the method specified below:

Parameter Analytical Method ML Total Residual Chlorine (TRC) 330.1* 0.05 mg/l Copper, total 200.7 0.010 mg/l

• An alternate EPA approved method may be used if the senstivity and mininun detection level are comparable to method 330.1.

b. For the purposes of reporting on the Discharge Monitoring Report (DMR), actual analytical results should be reported whenever possible. All analytical values at or above the detection limit shall be reported as the measured value. When results cannot be quantified, values below the detection limit shall be reported as "0".

c. In the " Comment Section" of the DMR, the Permittee shall report the lowest calibration standard used, the detection limit achieved, and the number of times non-detectable results were reported as "0". ,

f l

I

.. l l

Rationale South Carolina Electric and Gas Company Summer Nuclear Station NPDES Permit No. SC0030856 This is a renewal of the above referenced NPDES permit.

A. General Information The South Carolina Electric and Gas Company. Summer Nuclear Station (hereinafter referred to as the Permittee), operates a nuclear powered l electric Jower generating facility (SIC 4911) located at Highway 215.

Jenkinsville. South Carolina. The plant has a total rated electric generating capacity of 945 megawatts (MW) per day.

~

The following is a description of the discharges froin the facility:

Once-through cooling water is discharged through Outfall 001 to the Monticello Reservoir. Outfall 001 is located at latitude 034* 17' 44" and longitude 081* 18' 31".

Low volume wastes (house service water for cooling of emergency generators, cooling heat exchangers, and reactor building cooling units) are discharged through Outfall 002. Outfall 002 is an internal outfall that discharges via Outfall 001 normally or via the Circulating Water Intake to Monticello Reservoir when circulatng pumps are secured. Outfall 002 is located at latitude 034' 17' 58" and longitude 081* 18' 53".

Low level radiological wastes are discharged via Outfall 003 to Broad River. Outfall 003 is located at latitude 034* 17' 54" and longitude 081* 18' 55".

Low volume wastes (steam generator blowdown) are discharged via Outfall 004. Outfall 004 is an internal outfall that ultimately discharges via Outfall 001 to Monticello Reservuir. Outfall 004 is located at latitude 034' 17' 54" and longitude 081 18' 56".

Treated sanitary sewerage is discharged via Internal Outfall 005 located at latitude 034 17' 41" and longitude 081* 18' 40".

Ultimately, wastewaters are discharged via Outfall 014 to the Monticello Reservoir.

Low volume wastes (water treatment wastewaters) are discharged via Internal Outfall 006A located at latitude 034* 17' 40" and longitude 081* 18' 39". Ultimately, wastewaters are discharged via Outfall 014 to the Monticello Reservoir. I Low volume wastes and storm water from sumps in the transformer and l fuel oil storage and handling areas) are discharged via Internal j Outfall 006B located at i

Rationale Page 2 latitude 034* 17' 40" and longitude 081* 18' 37".

Ultimately, wastewaters are discharged via Outfall 014 to the Monticello Reservoir.

Low volume wastes (ion exchange regeneration and wastes from sumps located in the chemical feed equipment, caustic tank, and "D" battery room areas) are discharged via Outfall 007. Outfall 007 is an internal outfall that discharges via Outfall 001 to the Monticello Reservoir. Outfall 007 is located at latitude 034* 17' 52" and longitude 081* 18' 52". ~

Chemical metal cleaning wastes are discharged via Internal Outfall 008 located at latitude 034* 17' 40" and longitude 081 18' 40".

Ultimately, wastewaters are discharged via Outfall 014 to the Monticello Reservoir.

Wastewaters from yard drains in the north / northwest drea cf the plant site and industrial cooler water are discharged via Outfall 012 located at latitude 034 17' 54" and longitude 081* 19' 19". Outfall 012 discharges to the Broad River.

Wastewaters from yard drains in the southeast area of the plant site are discharged from Outfall 013 to the Broad River. Outfall 013 is located at latitude 034 17' 39" and longitude 081* 18' 32".

Combined wastewater from internal Outfalls 005, 006A, 006b, and 008 is discharged through Outfall 014 to the Monticello Reservoir. Outfall 014 is located at latitude

. 34* 17'44" and longitude 081 18' 31" The effluent from this facility is subject to the Steam Electric Power Generating Point Source Category (40 CFR Part 423).

The Monticello Reservoir is classified as a tributary to a Class FW water by the South Carolina Department of Health and Environmental Control. For purposes of this permit Monticello Reservoir will also be classified as a Class FW water, designated as freshwaters suitable for primary and secondary contact recreation and as a source for drinking water after conventional treatment. The waters are suitable for fishing and the survival and propagation of a balanced indigenous aquatic community of fauna and flora, as well as for industrial and agricultural uses.

The Broad River segment receiving discharge from the Permittee is classified as a Class FW water by the South Carolina Department of Health and Environmental Control.

The facility contact and mailing address follows:

l

)

I Rationale l Page.3 Gary Taylor Vice President Nuclear Operations South Carolina Electric & Gas Company /

P.O.- Box 88 Jenkinsville. South Carolina 29065 B. Derivation of Limitations Discharge limitations will be based on 1) the Steam Electric Effluent f Guidelines. 40 CFR Part 423: 2) State Water Quality Criteria set forth in The South Carolina Deoartment of Health and Environmental Control (SCDHEC)

Toxic Control Strateay for Wastewater Discharaes(Draft). South Carolina Department of Health and Environmental Control. October 1990: 3) the  !

Water Classification and Standards (Reculation 61-68): Classified Waters I (Reculations 61-69)./ South Carolina Department of Health and Environmental Control. April 27,1990: and 4) Guidance for NPDES Permits Issued to Steam Electric Power Plants. Rebecca W. Hanmer. Office of Water Enforcement and  ;

Permits. USEPA. August 22, 1985.

C. Prooosed Effluent limitations The total flow (0) from the facility to Monticello Reservoir follows:

Outfall 001 (once-through cooling d water) = 769 MGD

' = 13.5 MGD Outfall 002 (low volume wastes) l

= 0.144 MGD  ;

Outfall 004 (low volume wastes) = J Outfall 007 (low volume wastes) 0.08 MGD 5

Outfall 014 (sanitary sewerage from Outfall 005, low volume wastes -

from Outfalls 006A and 006B, metal cleaning wastes from k Outfall 008, and sanitary a

- 0.140 MGD ij sewerage from Outfall 011) .

Total = 782.864 MGD l The following dilution is 3rovided for Outfalls 001, 002. 004, 007, and  ;

014 discharges to Monticer o Reservoir: q Monticello Reservoir 7010 - O cfs - 0 MGD {

Monticello Reservoir annual average = 0 cfs - 0 MGD j 4

Therefore.

Rationale Page 4 Dilution factor - Stream flow + Plant Discharoe Plant Discharge 7010 Dilution factor - (0 + 782.9386) MGD - 1.0 782.9386 MGD Annual average dilution factor - (0 + 782.9386) MGD - 1.0 782.9386 MGD The total flow (0) from the facility to the Broad River follows:

Outfall 003 (low level radiological wastes) = 0.02 MGD Outfall 013 (storm water) = 0.00144 MGD Outfall 012(yard drains, service water) = 0.014 MGD

~

Total - 0.0354 MGP The following dilution is provided for Outfalls 003. 013. and 015 discharges to Broad River:

Broad River 7010 - 901 cfs - 582 MGD Broad River annual average = 6037 cfs = 3901.8 MGD Therefore, i

Dilution factor = Stream flow + Plant Discharae j Plant Discharge j 7010' Dilution factor - (582 + 0.0354) MGD - 10899 0.0354 MGD  !

l Annual average dilution factor - (3901.8 + 0.0354) MGD = 110221 0.0354 MGD Outfall 001 Description of Discharge: Outfall 001 discharges once-through cooling water at an average rate of 769 MGD. Applicable effluent guidelines for this Outfall are ,

the Steam Electric Point Source Category for existing sources, which provide the following limitations: '

. 1 i

Rationale f Page 5 <

l l

J Y

1. There shall be no discharge of PCBs.  ;

/

2' . Once-through-cooling water Parameter Maximum concentration (mg/1)

Total residual chlorine 0.20

3. Total residual chlorine may not be discharged from any single 3

generating unit for more than two hours per day unless the discharger 3 demonstrates to the permitting authority that discharge for more than two hours is required for macroinvertebrate control. Simultaneous multi-unit l chlorination is permitted. ]

Flow j

1. Form 2C Value: 769 MGD average. 769 MGD daily maximum.

2. Previous Permit: Monitor and report. i Effluent Guidelines: Not applicable. j 3.

4. Water Quality Criteria: Not applicable.

5. Human Health Consideration: Not applicable.

6. Detection Limit: Not a]plicable. j

7.

Conclusion:

The flow siall be monitored continuously by pump logs or recorder. This requirement is retained from the previous permit. j 1

y Total Residual Chlorine (TRC) j

1. . Form 2C Value: Reported as believed absent, J

2. Previous Permit: 0.2 mg/l instantaneous maximum.

3. Effluent Guidelines: 0.20 mg/l instantaneous maximum. J

4. Water quality criteria: 0.011 mg/l chronic. 0.019 mg/l acute .;

j allowable freshwater  ?

instream waste concentration.

5. Human Health Consideration: Not applicable.

6. Detection Limit: <0.1 mg/1.

The permittee has indicated that chlorine is not

7.

Conclusion:

presently added to the cooling water. In lieu of monitoring, a statement will be placed on the limits page prohibiting the addition of chlorine.

P.B

1. Form 2C Value: 7.64 s.u. minimum. 7.64 s.u. maximum.

2. Previous Permit: Not regulated.

3. Effluent Guidelines: Not applicable.

4. Water Quality Criteria (S.C. Regulation 61-69): The 3H of the ,

receiving waters shall be maintained between 6.0 standarc units and 8.5 standard units.

5. Human Health Consideration: Not applicable.

~_-._n.

O .'

Rationale Page 6

6. Detection Limit: Not applicable.

7.

Conclusion:

Based on Reg. 61-69. pH will be limited to the range 6.0 s.u.' to 8.5 s.u. at this outfall.

Aluminum

1. Form 2C Value: 0.238 mg/l

2. Previous Permit: none

3. Effluent Guidelines: Not applicable

4. Water Quality criteria: 0.087 mg/l (ave) 0.75 mg/l (max)

5. Human Health Consideration: none

6. Detection Limit: 0.05 mg/l

7.

Conclusion:

Analysis of intake water indicates an aluminum level of 0.248 mg/1. The aluminnum present appears to be due to the intake water and reflects ambient conditions in the lake. Therefore there will be no pr,oposed limit for aluminum.

It0D

1. Form 2C Value: 0.486 mg/l

2. Previous Permit: none

3. Effluent Guidelines: Not applicable

4. Water Quality Criteria: 1.0 mg/l (ave) 2.0 mg/l (max)

5. Organoleptic: 0.3 mg/l

6. Detection Limit: 0.02 mg/l

7.

Conclusion:

Analysis of intake water indicates an iron level of 0.379 mg/1. The iron present appears to be due to the intake water and reflects ambient conditions in the lake. Therefore there will

. be no proposed limit for iron.

Maanesium

1. Form 2C Value: 1.67 mg/l

2. Previous Permit: none

3. Effluent Guidelines: Not applicable

4. Water Quality criteria: 3.0 mg/l (ave) 6.0 mg/l (max)

5. Organoleptic: 100 mg/l

6. Detection Limit: 0.05 mg/l

7.

Conclusion:

Analysis of intake water indicates a magnesium level of

, 1.68 mg/1. The magnesium present appears to be due to the intake water and reflects ambient conditions in the lake. Therefore there will be no proposed limit for iron.

Mancanese

1. Form 2C Value: 0.0136 mg/l

2. Previous Permit: none

3. Effluent Guidelines: Not applicable

4. Water Quality Criteria: 1.0 mg/l (ave)

Rationale 1

)

Page 7 2.0 mg/l (max)

5. Human Health: 0.05 mg/l

6. Detection Limit: 0.01 mg/l 7.

Conclusion:

Based upon sampling data and reasonable potential procedures, no limit for manganese will be proposed.

Flouride

1. Form 2C Value: 0.123 mg/l

2. Previous Permit: none

3. Effluent Guidelines: Not applicable

4. Water Quality Criteria: none

---5.- 4.0 m 6.

Drinking Detection Water Limit: MCL:0.01 l mg/g/l

7.

Conclusion:

Based upon sampling data and reasonable potential procedures, no limit for flouride will be proposed.

Sulfate

1. Form 2C Value: 6.14 mg/l

2. Previous Permit: none

3. Effluent Guidelines: Not applicable

4. Water Quality Criteria: none

5. Drinking Water MCL: 250 mg/l

6. Detection Limit: 0.005 mg/l

7.

Conclusion:

Based upon sampling data and reasonable potential procedures, no limit for sulfate will be proposed.

Nitrate-nitrite

1. Form 2C Value: 0.36 mg/l --

2. Previous Permit: none 3.' Effluent Guidelines: Not applicable '

4. Water Quality Criteria: none

5. Drinking Water MCL: 10 mg/l

6. Detection Limit: 0.02 mg/l

7.

Conclusion:

Based upon sampling data and reasonable potential pmcedures, no limit for nitrate-nitrite will be proposed.

_1. 316(a)

The thermal component of the discharge from this facility is subject to l i

compliance with South Carolina Water Classifications and Standards (Reg.

61-68). Section D.(8)(a) of the standards stipulates that the water temp- l '

.- erature of all Class A waters "shall not be increased more than 5*F(2.8 C) above natural temperature conditions or exceed a maximum of 90 F(32.2 C) as a result of the discharge of heated liquids " unless a different temp-erature standard has been established, a mixing zone has been established, or a Section 316(a) determination under the Federal Clean Water Act (the Act) has been completed. Section 316(a) of the Act allows the permitting authority to impose alternative and less stringent thermal limitations after demonstration that the water quality standards limitations are more f

Rationale-Page 8 stringent than necessary to assure the protection and propagation of a balanced indigenous population of shellfish, fish, and wildlife in and on the receiving water.

On April 7,1975, as a part of permitting activities of the original NPDES permit. SCE&G provided information to support its request that alternative thermal effluent limitations be allowed under Section 316(a) of the Act. In April 30. 1976. a determination was made that the permittee had submitted adecuate information to demonstrate that the alternative limitations for the thermal component of the discharge would assure the protection and propagation of a balanced.

indigenous population of shellfish, fish and wildlife in and on the Monticello Reservoir. The alternate maximum discharge temperature for Outfall 001 is 45*C(113*F). A maximum thermal plume temperature of 32.2*C(90 F) and temperature rise of 1.66*C(3.0*F) is also imposed.

On July 1.1984 a continuation of the 316(a) variance was allowed by the reissuance of the NPDES permit. On January 3. 1989, a request to continue the variance was included as part of the application for reissuance of the NPDES Permit. To support the request, the permittee has indicated there has been no change in facility operation and no change in the biological community. A tentative determination was made that continuation of the 316(a) variance was appropiate in the reissuance of this permit.

On April 3 1997, the permittee submitted an application for reissuance of the permit. A request to continue the 316(a) variance was, included as part of the application. On June 19, 1997, the Department determined that continuance was appropriate.

2. Section 316(b)

Section 316(b) of the Act requires that the location, design, construction, and capacity of a cooling water intake structure reflect the best technology available for minimizing environmental impact.

On April 19, 1985, a determination was made, in a accordance with Section 316(b) of the Act, that the location, design, construction, and capacity of the cooling water intake structure (s) reflects the best technology available for minimizing adverse environmental impact.

This determination was based on information submitted by SCE&G in a 316(b) Demonstration (March 1977).

Outfall 002 Outfall 002 consists of house service water for cooling of emergency generators, cooling heat exchangers and reactor building cooling units and is discharged at

Rationale Page 9 an average rate of 13.5 MGD. These wastewaters are considered house service waters, a ~10w volume waste. The facility occasionally adds biocides and corrosion inhibitors to the water supply.  ;

Wastewaters are settled in the house service pond and periodically discharged to the Monticello Reservoir. The house service pond also serves as the backup source for_ emergency feed water. Applicable effluent guidelines for this Outfall are the Steam Electric Point Source Category for existing sources. which provide the following limitations:

1. The pH of all discharges, except once-through cooling water, shall be within the range of 6.0 standard units to 9.0 standard units.

2. There shall be no discharge of PCBs.

3. Low volume wastes ,

Parameter Maximum for any Average of daily values 1 day (mg/1) for 30 consecutive days shall not exceed (mg/1)

TSS 100.0 30.0 011 and Grease 20.0 15.0 Flow

1. Form 2C Value: 3.62 MGD average 10.27 MGD daily maximum.

2. , Previous Permit: Monitor and report.

4. Effluent Guidelines: Not applicable.

5. Water Quality Criteria: Not applicable.

6. Human Health Consideration: Not a

7. Detection Limit: Not applicable. pplicable.

8.

Conclusion:

Flow conditions at this outfall are similar to those during the previous permit's term. Since this discharge is intermittent, the flow monitoring requirements of an instantaneous measurement taken 1/ occurrence, as in the previous permit, remain.

DB

- - 1. Form 2C Value: 7.03 s.u. minimum 7.24 s.u. maximum.

~

2J Previous Permit:6.0 s.u. - 9.0 s.u.

3. Effluent Guidelines: 6.0 s.u. minimum 9.0 s.u. maximum.

4. Water Quality Criteria (S.C. Regulation 61-69): The 3H of the receiving waters shall be maintained between 6.0 standarc units and 8.5 standard units.

5. Human Health Consideration: Not applicable.

6. Detection Limit: Not applicable. I

7.

Conclusion:

The Water Quality Criteria limit of 6-8.5 s.u. is monitoring proposed. Since this discharge is intermittent, requirements of 1/ occurrence by grab sample are adopted.

Rationale Page 10 Total Susoended Solids (TSS)

1. Form 2C Value: 2 mg/l

2. Previous Permit: 30 mg/l ave., 100 mg/l max.

3. Effluent Guidelines: 30.0 mg/l monthly average and 100.00 mg/l daily max.

4. Water Quality Criteria: Not applicable.

5. Human Health Consideration: Not applicable.

6. Detection limit: <0.01 mg/1.

7.

Conclusion:

The discharge from Outfall 002 consists entirely of house service water, a low volume wastes. Therefore, low volume wastes limitations of 30 mg/l daily average and 100 mg/l daily maximum are applicable and are adopted in the permit. Since this discharge is intermittent monitoring requirements of 1/ occurrence by grab sample are adopted.

Oil and Grease

1. Form 2C Value:' 7 mg/l

2. Previous Permit: 15 mg/l ave., 20 mg/l max.

3. Effluent Guidelines: 15 mg/l monthly average and 20 mg/l daily

4. Water Quality Criteria: Not applicable.

5. Human Health Consideration: Not applicable.

6. Detection limit: <5 mg/1.

7.

Conclusion:

The discharge from Outfall 002 consists entirely of house service water, a low volume wastes. Therefore, low volume wastes limitations of 15 mg/l daily average and 20 mg/l daily.

maximum are applicable and are adopted in the permit. Since this discharge is intermittent, monitoring requirements of 1/ occurrence by grab sample are adopted.

Total Residual Chlorine

1. Form 2C Value: Reported as believed absent.

2. Previous Permit: 0.2 mg/l instantaneous maximum.

3. Effluent Guidelines: Not applicable.

4. Water Quality Criteria: 0.011 mg/l chronic. 0.019 mg/l acute allowable freshwater instream waste concentration. t

5. Human Health Consideration: Not applicable.

6. Detection limit: <0.05 mg/1.

7.

Conclusion:

The previous permit provides a limit of 0.2 mg/l instantaneous maximum which is less stringent than the water quality-based limitations (See Other Pollutants for a discussion of the derivation of these limits). Therefore, the water quality-based limits of 0.011 mg/l monthly average and 0.019 mg/l daily maximum are imposed. However, the State's achievable detection level for total residual chlorine is higher than water quality limitations. '

Therefore, the permittee must report down to the minimum detection level of <0.05 mg/l will be imposed as the monthly average and daily maximum limits. Since there is a possibility that chlorination i occurs, monitoring requirements of 1/ occurrence of chlorination by grab sample, as in the previous permit, remain appropriate and are

Rationale i Page 11 adopted.

Aluminum

1. Form 2C Value: 0.0685 mg/l

2. Previous Permit: none

3. Effluent Guidelines: Not applicable

_ _4 . Water Quality Criteria: 0.087 mg/l (ave) 0.75 mg/l (max)

5. Human Health Consideration: none

6. Detection Limit: 0.05 mg/l

7.

Conclusion:

Analysis of intake water indicates an aluminum level of 0.248 mg/1. The aluminum present appears to be due to the intake water and reflects ambient conditions in the lake. Therefore. there will be no proposed limit for aluminum.

Barium

1. Form 2C Valuei 0.016 mg/l

2. Previous Permit: none

3. Effluent Guidelines: Not app.licable

4. Water Quality Criteria: 50 mg/l (ave) 100 mg/l (max)

5. Human Health Consideration: 1.0 mg/l

6. Drinking Water MCL: 0.002 mg/l

7. Detection Limit: 0.05 mg/l

8.

Conclusion:

Based upon sampling data and reasonable potential procedures. no limit for barium will be proposed.

IC03

1. Form 2C Value: 0.143 mg/l

2. Previous Permit: none

3. Effluent Guidelines: Not applicable

4. Water 09ality Criteria: 1.0 mg/l (ave) 2.0 mg/l (max)

5. Organoleptic: 0.3 mg/l

6. Detection Limit: 0.02 mg/l

7.

Conclusion:

Analysis of intake water indicates an iron level of l

0.379 mg/1. The iron present appears to be due to the intake water J

. and reflects ambient conditions in the lake. Therefore there will be no proposed limit for iron.

Maanesium

1. Form 2C Value: 1.63 mg/l

2. Previous Permit: none

3. - Effluent Guidelines: Not applicable

4. Water Quality criteria: 3.0 mg/l (ave) 6.0 mg/l (max)

5. Organoleptic: 100 mg/l

6. Detection Limit: 0.05 mg/l

7.

Conclusion:

Analysis of intake water indicates a magnesium level of a

. l Rationale Page 12 1.68 mg/1. The magnesium present appears to be due to the lake.intake water and reflects ambient conditions in the

- Therefore. there will be no proposed limit for magnesium.

Flouride

1. Form 2C Value: 0.129 mg/l

2. Previous Permit: none

3. Effluent Guidelines: Not applicable

4. Water Quality Criteria: none

5. Drinking Water. MCL: 4.0 mg/l

6. Detection Limit: 0.01 mg/l

7.

Conclusion:

Based upon sampling data and reasonable potential procedures. no limit for flouride will be proposed.

Nitrate-nitrite

1. Form 2C Value! 0.297 mg/l

2. Previous Permit: none

3. Effluent Guidelines: Not applicable

4. Water Quality criteria: none

5. Drinking Water MCL: 10 mg/l

6. Detection Limit: 0.02 mg/l

7.

Conclusion:

Based upon sampling data and reasonable potential procedures, no limit for nitrate-nitrite will be proposed.

Sulfate

1. Forn ' Value: 6.63 mg/l

2. Pre. as Permit: Not regulated.

3. . Effluent Guidelines: Not applicable.

4. Water Quality Criteria: Not applicable.

5. Human Health Consideration: Not applicable.

6. Detection limit: 0.01 mg/1.

7.

Conclusion:

Based upon reasonable potential procedures, no limit will be proposed for sulfate.

Temoerature

1. Form 2C Value: 17*C (winter)

2. Previous Permit: Monitor and report.

3. Effluent Guidelines: Not applicable.

4. Water Quality Criteria: The receiving water temperature may not be increased by more than 2.8'C or exceed a maximum of 32.2*C. unless a Section 316(a) determination has been completed.

5. Human Health Consideration: Not a

6. Detection limit: Not applicable. pplicable.

7.

Conclusion:

Based on historical data it does not appear that the temperature standard will be exceeded, therefore temperature will be monitored and reported as in the previous permit.

Outfall 003

l s

' Rationale Page 13 I

0utfall 003 consists of low level radiological wastes including reactor water, non-reactor grade . floor drains, and laundry and shower drains intermittently dischar.ged. Wastewaters are treated in the Liquid Waste Processing System by l evaporation and ion exchange, and are held in Waste Monitor Tank Nos. I and 2 for j wastewater nonitoring to ensure the wastewater quality is within NPDES and NRC limits prior to discharging. Applicable effluent guidelines for this Outfall are -

the Steam Electric Point Source Category for existing sources, which provide the following limitations:

I

1. The pH of all discharges, except once-through cooling water, shall be ]

j within-the range of 6.0 standard units to 9.0 standard units.

]

2. There shall be no discharge of PCBs. 3

.?

j

3. Low volume' wastes  ;

Parameter Maximum for any Average of daily values i 1 day (mg/1) for 30 consecutive days l shall not exceed (mg/l)  ;

100.0 30.0 \1 TSS  ;

011 and Grease 20.0 15.0 Flow

1. Form 2C Value: 0.0042 MGD average. 0.005 MGD daily maximum.  ;

2. Previous Permit: Monitor and report.

3.. Effluent Guidelines: Not applicable. l -

4. Water Quality Criteria: Not applicable.

5. Human Health Considerat n: Not applicable.

6. Detection Limit: Not a 11 cable.

7.

Conclusion:

Flow conditions at this outfall are similar to those ,

during the previous permit's term. Since the. discharge is i intermittent, the flow monitoring requirements of an instantaneous measurement taken 1/ occurrence, as in the previous permit, remain 3 appropriate and are therefore imposed. j

. p3 i

1. Form 2C Value: 6.02 s.u. minimum 8.85 s.u. maximum, .

2, Previous Permit: 6.0 s.u. minimum, 9.0 s.u. maximum.

Effluent Guidelines: Not applicable.

i

3. .The pH of the

4. Water Quality Criteria (S.C. Regulation 61-69): j receiving waters shall be maintained between 6.0 and 8.5 standard 9 units.

5. Human Health Consideration: Not applicable.

6. Detection Limit: Not applicable.  :

Conclusion:

This wastestream is discharged to the penstocks of

7. '

Fairfield Hydro. Due to the high dilution and' mixing in the s

7 Rationsle Page 14 penstocks, it is unlikely that water quality criteria for pH will be exceeded. The proposed limit will be based on the effluent guiielines: 6.0 - 9.0 s.u..

Total Susoended Solids (TSS)

1. Form 2C Value: 6.3 mg/l daily maximum. 0.64 mg/l long term average.

2. Previous Permit: 30 mg/l monthly average.100 mg/l instantaneous maximum, e Effluent Guidelines: 30 mg/l (ave). 100 mg/l (max)

4. Water Quality Criteria: Not applicable.

5. Human Health Consideration: Not applicable.

6. Detection limit: <0.01 mg/1.

7.

Conclusion:

Limitations of 30 mg/l monthly average and 100 mg/l instantaneous maximum are adopted based on effluent guidelines.

Conditions at this outfall are similar to those during the previous permit's term. Since this discharge is intermittent, monitoring requirements 6f 1/ occurrence by grab samale, as in the previous permit, remain appropriate and are adopted.

Oil and Grease

1. Form 2C Value: 13.1 mg/l daily maximum. 0.58 mg/l long term average.

2. Previous Permit: 15 mg/l monthly average. 20 mg/l instantaneous maximum.

3. Effluent Guidelines: 15 mg/l (ave). 20 mg/l(max)

4. Water Quality Criteria: Not applicable.

5. Human Health Consideration: Not applicable.

6. Detection limit: <5 mg/1.

7. s

Conclusion:

Limitations of 15 mg/l monthly average and 20 mg/l instantaneous maximum are adopted based on effluent guidelines.

Since this discharge is intermittent. monitoring requirements of 1/ occurrence by grab sample, as in the previous permit. remain appropiate and are adopted.

Boron

1. Form 2C Value: 138 mg/l

2. Previous Permit: Monitor and report.

3. Effluent Guidelines: Not applicable.

4. Water Quality Criteria:Not applicable.

5. Human Health Consideration: (Drinking Water MCL)-20 mg/l(110221) -

2204426.8 mg/1

6. Detection limit: <0.01 mg/1.

7.

Conclusion:

Based on a comparison of the Boron concentration with the Human Health based limit, there will not be a limit for Boron.

Maanesium

1. Form 2C Value: 0.0194 mg/l

2. Previous Permit: none

3. Effluent Guidelines: Not applicable

i Rationale Page 15

4. Water Quality Criteria: 3.0 mg/l X 10899 - 32697 mg/l (ave)

-6.0-mg/1 X 10899 .65394 mg/l (max) l

5. Organoleptic: 100 mg/l X 110221 - 11022100 mg/l

6. Detection Limit: 0.05 mg/l

7.

Conclusion:

Based upon sampling data and reasonable potential procedures, no limit for magnesium will be proposed.

f

~

~

Molybdenum

1. Form 2C Value: 0.0129 mg/l l i

2. Previous Permit: none  !

3. Effluent Guidelines: Not applicable Water Quality Criteria: none  !

4.

5. 1)etection Limit: 0.02 mg/l l

6.

Conclusion:

Based upon samaling data and reasonable potential j procedures, no limit for moly 3denum will be proposed. /

Zinc

1. Form 2C Value: 20.7 ug/l

2. Previous Permit: Not regulated  !

3. Effluent Guidelines: Not applicable

4. Water Quality Criteria: 0.059 mg/l(10899) - 643 mg/l ave.

0.065 mg/l(10899) = 708 mg/l max. i

5. Human Health Consideration:50 mg/1(110221) = 5511050 mg/l J

6. Detection Limit: <0.01 mg/l

7.

Conclusion:

Based on a comparison between the 2C value and water quality based limits, no limit for zine will be required.

Total Cooper

1. Form 2C Value: 0.0379 mg/l

2. Previous Permit: 1.0 mg/l monthly average, 1.0 mg/l instantaneous maximum.

3. Effluent Guidelines: Not applicable.

4. Water Quality Criteria: 0.0065 mg/l(10899) - 70.8 mg/l ave.

0.0092 mg/l(10899) = 100.3 mg/l max.

5. Human Health Consideration: 1.0 mg/l(110221) = 110221 mg/l

6. Detection limit: <0.01 mg/1.

7.

Conclusion:

Based on a comparison between the 2C value and water quality based limits, there will be no limit for copper.

Total Iron _

1. Form 2C Value: 0.146 mg/l

2. Previous Permit: 1.0 mg/l monthly average. 1.0 mg/l instantaneous maximum. i

3. Effluent Guidelines: Not applicable.

4. Water Quality Criteria: Not applicable.

5. Human Health Consideration: Not applicable.

6. Detection limit: 0.001 mg/1.

7.

Conclusion:

Based on a comparison between the 2C value and water quality based limits, there will be no limit for iron.

l Rationale Page 16 Mercury

1. Form 2C Value: 0.000552 mg/l

2. Previous Permit: Not regulated

3. Effluent Guidelines: Not applicable

4. Water Quality Criteria: 0.012 ug/l X 10899 - 130.8 ug/l 2 4 ug/l x 10899 - 26157.6 ug/l

5. Human Health Consideration (Drinking Water MCL): 2.0 ug/l X 110221 -

220442 ug/l

6. Detection Limit: 0.005 mg/l  !

7.

Conclusion:

Based on the 2C sampling concentration and reasonable potential procedures, no limit will be required for selenium.

Outfall 004 Outfall 004 consists of steam generator blowdown discharged at an average rate of 0.144 MGD. Wastewaters are settled then discharged via Outfall 001 to Monticello Reservoir or via Outfall 003 (as low level radiological waste) to Broad River.

Applicable effluent guidelines for this Outfall are the Steam Electric Point Source Category for existing sources, which provide the following limitations:

1. The pH of all discharges, except once-through cooling water, shall be within the range of 6.0 standard units to 9.0 standard units.

2. There shall be no discharge of PCBs.

3. Low volume wastes Parameter Maximum for any Average of daily values 1 day (mg/1)- for 30 consecutive days shall not exceed (mg/1)

TSS 100.0 30.0 011 and Grease 20.0 15.0 Flow

1. Form 2C Value: 0.158 MGD average. 0.079 daily maximum.

2. Previous Permit: Monitor and report.

3. Effluent Guidelines: Not applicable.

4. Water Quality Criteria: Not applicable.

5. Human Health Consideration: Not a

6. Detection Limit: Not applicable. pplicable.

7.

Conclusion:

Conditions at this outfall are similar to those during the previous permit's term. Therefore, monitoring

I '

-l I. S n

y Rationale Page 17 ,

requirements of an instantaneous measurement taken  :

1/ month, as in the previous permit, remain appropriate and are imposed. -

D11

1. Form 2C Value: 7.07 s.u. minimum. 8.9 s.u. maximum. j!

2. Previous Permit: 6.0 s.u. minimum. 9.0 s.u. maximum.

3. Effluent Guidelines: 6.0 s.u. minimum. 9.0 s.u. maximum.

4. Water Quality Criteria (S.C. Regulation 61-69): The pH of the d receiving waters shall be maintained between 6.0 and 8.5 standard  :)

units.

5. Human Health Consideration: Not applicable. (

6. Detection Limit: Not applicable. *

7.

Conclusion:

Although the water quality standard is more stringent than the effluent guideline limits this wastestream is combined with once through cooling water prior to discharge through Outfall 001. A water ' quality limit will be placed at the final outfall.

Total Susoended Solids (TSS) J

1. Form 2C Value: 21 mg/l daily maximum 3.81 mg/l long term average.

Previous Permit: 30 mg/l monthly average.100 mg/l instantaneous j

2. J maximum.

3. Effluent Guidelines: 30.0 mg/l monthly average and 100.00 mg/l daily maximum with adjustments for dilution.

4. Water Quality Criteria: Not applicable.

5. Human Health Consideration: Not applicable.

6. Detection limit: <0.01 mg/1.

7.. '

Conclusion:

Based on Effluent Guidelines, the proposed limit is 30 ,

mg/l as a monthly ave. and-100 mg/l as a max..

Oil and Grease

1. Form 2C Value: 2.5 mg/l daily maximum 0.98 mg/l long term average.

2. Previous Permit.: 15 mg/l monthly average. 20 mg/l instantaneous maximum.

3. Effluent Guidelines: 15 mg/l monthly average and 20 mg/l daily maximum with adjustments for dilution. -

4. Water Quality Criteria: Not applicable.

. 5. Human Health Consideration: Not applicable.

6. Detection limit: <5 mg/1.

7.

Conclusion:

Therefore, effluent guidelines-based limitations of 15 mg/l monthly average and 20 mg/l daily maximum are applicable to this discharge. However, the previous permit limit of 20 mg/l instantaneous maximum .is more stringent than the Therefore, effluent -

' 9uidelines-based limit of 20 mg/l daily maximum.

~

limitations of 15 mg/l monthly average and 20 mg/l instantaneous maximum are adopted based on anti-backsliding.

Outfall 005

Rationale Page 18 Outfall 005 is an internal outfall consisting of treated sanitary sewerage with an average discharge flow of 0.005 MGD. Wastewaters are treated.in an aeration pond, followed by a stabilization pond. Ultimately, e.ffluent is chlorinated in a chlorine contact chamber prior to commingling with other wsstewaters and discharging via Outfall 014 to the Monticello Reservoir.

Flow

1. Form 2C Value: 0.005017 MGD average. 0.0222 MGD daily maximum.

2. Previous Permit: Monitor and report.

3. Effluent Guidelines: Not applicable.

4. Water Quality Criteria: Not applicable.

5. Human Health Consideration: Not a

6. Detection Limit: Not applicable. pplicable.

7.

Conclusion:

.The monitoring requirements of instantaneous measurements taken 1/ week, as in the previous permit, remain appropriate and are imposed.

5-Day Biochemical Oxvoen Demand (BODd

1. Form 2C Value: 22.4 mg/l daily maximum 10.4 mg/l long term average.

2. Previous Permit: 30 mg/l monthly average. 45 mg/l daily maximum.

3. Effluent Guidelines: Not applicable.

4. Water Quality Criteria: Not applicable.

5. Human Health Consideration: Not applicable.

6. Detection limit: <2 mg/1.

7.

Conclusion:

Limitations of 30 mg/l monthly average and 45 mg/l

- daily maximum are adopted based secondary treatment standards.

Total Susoended Solids (TSS)

1. Form 2C Value: 14.4 mg/l daily maximum 5.9 mg/l long term average.

2. Previous Permit: 30 mg/l monthly average 45 mg/l daily maximum.

3. Effluent Guidelines: Not applicable.

4. Water Quality Criteria: Not applicable.

5. Human Health Consideration: Not applicable.

6. Detection limit: <0.01 mg/1.

7.

Conclusion:

Limitations of 30 mg/l monthly average and 45 mg/l daily maximum are adopted based on secondary standards.

Fecal Coliform

1. Form 2C Value:

2. Previous Permit: 1.75#/100 ml monthly average.19#/100 ml daily maximum.

3. Effluent Guidelines: Not applicable.

4. Water Quality Criteria: Not applicable.

5. Human Health Consideration: Not applicable.

6. Detection limit: <2/100 ml.

7.

Conclusion:

The previous permit limits of 200/100 ml monthly

Rationale -

Page 19 -

average and 400/100 ml daily maximum are adopted based on Wasteload Allocation recommendations.

Total Residual Chlorine

1. Form 2C Value: Not available

2. Previous Permit: Not regulated.

3. Effluent Guidelines: Not applicable.

4. Water Quality Criteria: Not applicable.

5. Human Health Consideration: Not applicable.

6. Detection limit: <0.01 mg/1.

7.

Conclusion:

A limit for TRC will not be required at this outfall, since this is an internal outfall and the wastestream is not subject to the steam electric guidelines. A water quality limit for TRC will be applied at the final discharge point (0utfall 014) to the receiving water body.

Outfall 006A Outfall 006A is an internal outfall consisting of low volume wastes discharging at an average rate of 0.08 MGD. Internal Outfall 006A discharges treated wastewater from the water treatment area referred to as the Alum Sludge Basin.

Treatment consists of sedimentation prior to discharge. Wastewaters from Internal Outfall 006A is commingled with other wastewaters and discharged via newly designated Outfall 014 to Monticello Reservoir. Applicable effluent j guidelines for this Outfall are the Steam Electric Point Source Category for existing sources which provide the following limitations:

)

1. The pH of all discharges except once-through cooling water. shall be within the range of 6.0 standard units to 9.0 standard units.

2. There shall be no discharge of PCBs. 4

3. Low volume wastes Maximum for any Average of daily values Parameter for 30 consecutive days 1 day (mg/1) shall not exceed (mg/1)

TSS 100.0 30.0 20.0 15.0 Oil and Grease Flow _

Form 2C Value: 0.0207 MGD average. 0.0543 MGD daily maximum.

1.

2. Previous Permit: Monitor and report.

3. Effluent Guidelines: Not applicable.

4. Water Quality Criteria: Not applicable.

5. Human Health Consideration: Not applicable.

I I

Rationale Page 20

6. Detection Limit: Not applicable.

7.

Conclusion:

Monitoring by instantaneous measurement, as in the previous permit, is proposed.

Total Susoended Solids (TSS)

1. Form 2C Value: 3.4 mg/l daily maximum. 1.18 mg/l average.

2. Previous Permit: 30 mg/l monthly average. 100 mg/l instantaneous maximum.

3. Effluent Guidelines: 30.0 mg/l monthly average and 100.00 mg/l daily maximum with adjustments for dilution.

4. Water Quality Criteria: Not applicable.

5. Human Health Consideration: Not applicable.

6. Detection limit: <0.01 mg/1.

7.

Conclusion:

Effluent guidelines-based limitations of 30 mg/l monthly average and 100 mg/l daily maximum are proposed for this discharge.

Oil and Grease

1. Form 2C Value: 3.5 mg/l maximum. 0.87 mg/l long term average.

2. Previous Permit: 15 mg/l monthly average. 20 mg/l instantaneous maximum.

3. Effluent Guidelines: 15 mg/l monthly average and 20 mg/l daily maximum with adjustments for dilution.

4. Water Quality Criteria: Not applicable.

5. Human Health Consideration: Not applicable.

6. Detection limit: <5 mg/1.

7.

Conclusion:

Effluent guidelines-based limitations of 15 mg/l monthly average and 20 mg/l daily maximum are proposed for this discharge.

Ot$erPollutants Several other pollutants may be present in this outfall due to the addition of chemical additives. These include ammonia: morpholine: soda ash: aluminum sulfate: chlorine; boron: biocides including zinc sulfate, tetrasodium pyrophosphate, and polymer: and algicides containing copper.

These pollutants were evaluated at the final discharge location: newly designated Outfall 014 to Monticello Reservoir.

Outfall 006B Outfall 006B isflow at an average an internal of 0.064outfall MGD.consisting of low volume wastes discharging Internal Outfall 006B discharges treated wastewater from various sumps in the transformer and fuel oil storage and handling areas. Treatment consists of oil skiming and sedimentation prior to discharge. Wastewaters from Internal Outfall 006B are commingled with other wastewaters and discharged via newly designated Outfall 014 to Monticello Reservoir. Applicable effluent guidelines for this Outfall are the Steam Electric limitations: Source Category for existing sources, which provide the following Point

h 3

i Rationale f Page 21

1. The pH of all discharges, except once-through cooling water, shall be <

within-the range-of 6.0 standard units to 9.0 standard units.

2. There shall be no discharge of PCBs.

3. Low volume wastes Parameter Maximum for any Average of daily values 1 day (mg/1) for 30 consecutive days shall not exceed (mg/1)

TSS 100.0 30.0 Oil and Grease 20.0 15.0 Flow l

1. Form 2C Value: 0.064 MGD average. 0.286 MGD daily maximum. j

2. Previous Permit: Monitor and report. 1

3. Effluent Guidelines: Not applicable. l

4. Water Quality Criteria: Not applicable.

5. Human Health Consideration: Not a

6. Detection Limit: Not applicable. pplicable.

7.

Conclusion:

Monitoring by instantaneous measurement, as in the previous permit, is proposed. To be consistent with other outfalls regulated in this permit, the monitoring frequency is reduced to

. 1/ month.

Total Susoended Solids (TSS)

1. Form 2C Value:- mg/1 daily maximum. 4.24 mg/l long term average.

2. Previous Permit: 30 mg/l monthly average. 98 mg/l instantaneous maximum.

3. Effluent Guidelines: 30.0 mg/l monthly average and 100.00 mg/l

4. Water Quality Criteria: Not applicable.

5. Human Health Consideration: Not applicable.

6. Detection limit: <0.01 mg/1.

7.

Conclusion:

The previous permit limits are more stringent than the effluent guideline based limits. Past monitoring data indicates that the permittee has been meeting the limits. Based on antibacksliding, the previous permit limits are proposed.

Oil and Grease

1. Form 2C Value: 3.93 mg/l daily maximum. 13.4 mg/l average.

2. Previous Permit: 15 mg/l monthly average.19 mg/l maximum

3. Effluent Guidelines: 15 mg/l monthly average and 20 mg/l daily I maximum with adjustments for dilution.

4. Water Quality Criteria: Not applicable. l I

l Rationale Page 22

5. Human Health Consideration: Not applicable.

6. Detoction limit: <5 mg/1.

7.

Conclusion:

The previous permit limits are more stringent than the effluent guideline based limits. Past monitoring data indicates that the permittee has been meeting the limits. Based on ant 1 backsliding, the previous permit limits are proposed.

Other Pollut6nts Several other pollutants may be present in this outfall due to the addition of chemical additives. These include ammonia: sodium nitrate / sodium borate: and algicides containing copper. These pollutants were evaluated at the final discharge location: newly designated Outfall 014 to Monticello Reservoir.

Outfall 007 Outfall 007 consists of lod volume wastes from ion exchange regeneration and from sumps Rationale located in the chemical feed equipment, caustic tank, and "D" battery room areas with a commingled average discharge flow of 0.08 MGD.

Treatment consists of neutralization prior to commingling with other wastestreams and final discharge through Outfall 001 to Monticello Reservoir. Applicable effluent guidelines for this Outfall are the Steam Electric Point Source Category for existing sources, which provide the following limitations:

1. The pH of all discharges, except once-through cooling water, shall be within the range of 6.0 standard units to 9.0 standard units.

2. ,

There shall be no discharge of PCBs.

3. Low volume wastes Parameter Maximum for any Average of daily values 1 day (mg/1) for 30 consecutive. days shall not exceed (mg/1)

TSS 100.0 30.0 011 and Grease 20.0 15.0 Flow

1. Form 2C Value: 0.078 MGD average. 0.24 NGD daily maximum.

2. Previous Permit: Monitor and report.

3. ~ Effluent Guidelines: Not applicable.- -=

4. Water Quality Criteria: Not applicable.

5. Human Health Consideration: Not applicable.

L .

Rationale Page 23

)

6. Detection Limit: Not applicable.

7.

Conclusion:

The current method of monitoring fits the definition of

. " estimate" and will continue as such. l d i

1. Form 2C Value: 6.01 s.u. minimum 8.9 s.u. maximum.

2. Previous Permit: 6.0 s.u. minimum. 9.0 s.u. maximum.

3. Effluent Guidelines: 6.0 s.u. minimum. 9.0 s.u. maximum.

~ -

4. Water. Quality. Criteria (S.C, Regulation 61-69): The pH of the receiving waters shall be maintained between 6.0 and 8.5 standard units.

5. Human Health Consideration: Not a

6. Detection Limit: Not applicable. pplicable.

7.

Conclusion:

Since this wastestream is commingled with other wastestreams prior to the final discharge, water quality limits are not applicablp. Effluent guideline based limits of 6.0 to 9.0 s.u. . i as in the previous permit, shall be imposed.

Total Susoended Solids (TSS)

1. Form 2C Value: 17.1 mg/l daily maximum. 3.37 mg/l long ' term average.

2. Previous Permit: 30 mg/l monthly average.100 mg/l instantaneous maximum.

3. Effluent Guidelines: 30.0 mg/l monthly average and 100.00 mg/l

4. Water Quality Criteria: Not applicable.

5. Human Health Consideration: Not applicable.

6. Detection limit: <0.01 mg/1.

7..,

Conclusion:

Effluent guidelines-based limitations of 30 mg/l ,

monthly average and 100 mg/l daily maximum are applicable to this i discharge. l l

Oil and~ Grease

1. Form 2C Value: 3.2 mg/l daily maximum.1.26 mg/l average.

2. Previous Permit: 15 mg/l monthly average. 20 mg/l instantaneous maximum. '

3. Effluent Guidelines: 15 mg/l monthly average and 20 mg/l daily maximum with adjustments for dilution. 4

. 4. Water Quality Criteria: Not applicable.

5. Human Health Consideration: Not applicable.  :

6. Detection limit: <5 mg/1. i

7.

Conclusion:

Effluent guidelines-based limitations of 15 mg/l monthly average and 20 mg/l daily maximum are applicable to this ,

discharge. l Outfall 008 Outfall 008 is an internal outfall which consists of chemical metal cleaning

j Rationale Page 24  !

wastes. Internal Outfall 008 discharges approximately 2 times per year from the Plant Startup Waste Holding Basin. The facility has reported 0 MGD as the average discharge flow rate from Internal Outfall 008. Treatment consists of neutralization and sedimentation prior to discharge. Wastewaters from Internal Outfall 008 are commingled with other wastewaters and discharged via newly designated Outfall 014 to Monticello Reservoir. Applicable effluent guidelines for this Outfall are the Steam Electric Point Source Category for existing sources, which provide the following limitations:

e .

1. The pH of all discharges, except once-through cooling water, shall be within the range of 6.0 standard units to 9.0 standard units.

2. There shall be no discharge of PCBs.

3. Metal cleaning wastes Parameter Maximum for any Average of daily values 1 day (mg/1) for 30 consecutive days shall not exceed (mg/1)

TSS 100.0 30.0 I Oil and Grease 20.0 15.0 Total Copper 1.0 (

1.0 (

Total Iron 1.0 1.0 '

Flow

1. Form 2C Value: 0 MGD average. O MGD daily maximum.

2. Previous Permit: Monitor and report.

3. Effluent Guidelines: Not applicable.

4. Water Quality Criteria: Not applicable.

5. Human Health Consideration: Not a

6. Detection Limit: Not applicable. pplicable.

7.

Conclusion:

Conditions at this outfall are similar to those during the previous permit term. Therefore, monitoring requirement of an instantaneous measurement 1/ day as in the previous permit, remain appropriate and are imposed.

DB

1. Form 2C Value: 10 s.u. minimum.10 s.u. maximum.

2. Previous Permit: 6.0 s.u. minimum. 9.0 s.u. maximum.

3. Effluent Guidelines: 6.0 s.u. minimum. 9.0 s.u. maximum.

4. Water Quality Criteria (S.C. Regulation 61-69): The pH of the receiving waters shall be maintained between 6.0 and 8.5 standard units.

5. Human Health Consideration: Not a

6. Detection Limit: Not applicable. pplicable.

Rationale Page 25

7.

Conclusion:

The stream standard based limit of 6.0 to 8.5 s.u.

will be applied at the final discharge point (0utfall 014) since it is more stringent than the effluent gu'deline limit.

Total Susoended Solids (TSS)

1. Form 2C Value: 1.3 mg/l daily maximum. y

2. Previous Permit: 30 mg/l monthly average. 100 mg/l instantaneous

~ maximum.~~

3. Effluent Guidelines: 30.0 mg/l monthly average and 100.00 mg/l

4. Water Quality Criteria: Not applicable.

5. Human Health Consideration: Not applicable.

Detection limit: <0.01 mg/1.

6.

7.

Conclusion:

Effluent guidelines-based limitations of 30 mg/l monthly average and 100 mg/l daily maximum are proposed for this discharge.

~

Oil and Grease

1. Form 2C Value: 0.05 mg/l daily maximum.

2. Previous Permit: 15 mg/l monthly average. 20 mg/l instantaneous maximum.

3. Effluent Guidelines: 15 mg/l monthly average and 20 mg/l daily maximum with adjustments for dilution.

4. Water Quality Criteria: Not applicable.

5. Human Health Consideration: Not applicable.

6. Detection limit: <5 mg/1.

7.

Conclusion:

Effluent guidelines-based limitations of 15 mg/l monthly average and 20 mg/l . daily _ maximum are proposed for this discharge. 3 Total Cocoer

1. Form 2C Value: <0.01 mg/l

2. Previous Permit: 1.0 mg/l monthly average. 1.0 mg/l instantaneous maximum.

Effluent Guidelines: 1.0 mg/l monthly average and 1.0 mg/l daily

3. ~~ maximum with adjustments for dilution.

4. Water Quality Criteria: 0.0065 mg/l monthly average. 0.0092 mg/l daily maximum

5. Human Health Consideration: 1.0 mg/l instream waste concentration

6. Detection limit: <0.01 mg/1.

7.

Conclusion:

Effluent guidelines-based limitations of 1.0 mg/l monthly average and 1.0 mg/l daily maximum are proposed for this discharge. Water quality limits of 0.0065 mg/l monthly average and 0.0092 mg/l daily maximum are applicable at the final discharge point 014.

Total Iron

1. Form 2C Value: 4.84 mg/l daily maximum.

2. Previous Permit: 1.0 mg/l monthly average.1.0 mg/l instantaneous maximum.

l

-mmwwmwrar-Rationale Page 26

3. Effluent Guidelines: 1.0 mg/l monthly average and 1.0 mg/l daily maximum with adjustments for dilution.

4. Water Quality Criteria: 1.0 mg/l

5. Human Health Consideration: 0.3 mg/l (domestic water supplies)

6. Detection limit: <0.01 mg/1.

7.

Conclusion:

Effluent guidelines-based limitations of 1.0 mg/l monthly average and 1.0 mg/l daily maximum are proposed for this discharge.

Other Pollutants Several other pollutants may be present in this outfall due to the addition of chemical additives. These include hydrazine; morpholine:

boron: gaseous chlorine: and sodium nitrate / sodium borate.

pollutants were evaluated at the final discharge location: These newly designated Outfall 014 to Monticello Reservoir.

~

Outfall 012 Dutfall 012 is an internal outfall which consists of storm water runoff from yard drains in the north / northwest area of the plant site and previously monitored house service water from Internal Outfalls 009A and 009B. No treatment is provided prior to discharge to the Broad River. Occasionally, chlorine is added at Internal Outfalls 009A and 009B. Applicable effluent guidelines for this Outfall are the Steam Electric Point Source Category for existing sources, which provide the following limitations:

1. The pH of all discharges, except once-through cooling water, shall be within the range of 6.0 standard units to 9.0 standard units.

2. There shall be no discharge of PCBs.

3. Low volume wastes Parameter Milximum for any Average of daily values 1 day (mg/1) for 30 consecutive days shall not exceed (mg/l)

TSS 100.0 30.0 011 and Grease 20.0 15.0 Flow

1. Form 2C Value: 0.033 MGD average. 0.039 MGD daily maximum.

2. Previous Permit: Not regulated.

3. Effluent Guidelines: Not applicable.

4. Water Quality Criteria: Not applicable.

5. Human Health Consideration: Not a

6. Detection Limit: Not applicable. pplicable.

~.

~

. j i

i Rationale s Page 27 '

Monitoring requirements of .1/ month by estimate are j

7.

Conclusion:

2 adopted.

DB

1. Form 2C Value: 6.41 s.u. minimum. 7.7 s.u. maximum. j

2. Previous Permit: 6.0 s.u. to 8.5 s.u. <

3. Effluent Guidelines: 6.0 s.u. minimum. 9.0 s.u. maximum.  !

4. Water Quality Criteria (S.C. Regulation 61-69): The pH ~of the receiving waters shall be maintained between 6.0 and 8.5 standard {

1 units.

5. Human Health Consideration: Not applicable.

6. Detection Limit: Not applicable.

7.

Conclusion:

The limit for pH will be 6.0 - 8.5 s.u. based on 1 Water Quality Criteria. Sampling shall be performed once per month q j

by grab sample. d Total Susoended Solids (TSS)

1. Form 2C Value: 5.1 mg/l maximum. 0.78 mg/l ave.  :

i

2. Previous Permit: 26 mg/l ave., 70 mg/ max.

3. Effluent Guidelines: 30.0 mg/l monthly average and 100.00 mg/l j daily maximum with adjustments for dilution, -

4. Water Quality Criteria: Not applicable.

5. Human Health Consideration: Not applicable. J

6. Detection limit: <0.01 mg/1.  !

7.

Conclusion:

The discharge from Outfall 012 consists of low volume wastes from Outfalls 009A and 009B. and storm water runoff. Low volume wastes have total suspended solids limitations of 30 mg/l j daily average and Inn mg/l daily maximum a:, per the Steam Electric <

Effluent Guidelines. Since the storm water runoff p ovides i dilution, it must be cccounted for via the following[: j t

30 day Daily  !

Flow Averaae Maximum Total low volume wastes process flows 0.008 MGD 30 mg/l 100 mg/l l 0.006 MGD 20 mg/l 30 mg/l l Yard drain flows Total flows 0.014 MGD

\

1 The procedures and limitations for flow weighted averaging 2

calculations when regulated wastestreams are commingled are taken from the August 22, 1985, memo entitled " Guidance for NPDES Permits l Issued to Steam Electric Power Plants." The TSS values of 20 mg/l monthly average and 30 mg/l daily maximum for the yard drain component of the discharge come from this memo.

l

__.-.._....m.. .......mm m .:is.m:

Rationale.

Page 28 Using this data, the limitations at Outfall 012 are calculated as follows:

Total Suspended Solids Monthly Average Limit 0.008 (30) + 0.006 (20) = 25.7 mg/l (rounded to 26 mg/1) 0.014 Total Suspended Solids Daily Maximum Limit 0.008 (100) + 0.006 (30) - 70 mg/l  !

0.014 Since no exceedances of these limits are expected, monitoring is established at a frequency of 1/ month by grab sample to be consistent with other outfalls discharging low volume wastes at this facility. .

Oil and Grease

1. Form 2C Value: 2.7 mg/l max., 0.61 mg/l ave.

2. Previous Permit: 9 mg/l ave, 11 mg/l max

3. Effluent Guidelines: 15 mg/l monthly average and 20 mg/l daily maximum with adjustments for dilution. ~

4. Water Quality Criteria: Not applicable.

5. Human Health Consideration: Not applicable.

6. Detection limit: <5 mg/1.

7.

Conclusion:

The discharge from Outfall 012 consists of low volume wastes from Outfalls 009A and 009B, and storm water runoff. Low volume wastes have oil and grease limitations of 15 mg/l daily averago and 20 mg/l daily maximum as per the Steam Electric Effluent Guidelines. Since the storm water runoff provides dilution, it must be accounted for via the following2;

\

30 day Daily Flow Averaae Maximum Total low volume wastes process flows 0.008 MGD 15 mg/l 20 mg/l Storm water flows 0.006 MGD 0 mg/l 0 mg/l Total flows 0.014 MGD l

2 The procedures and limitations for flow weighted averaging calculations when regulated wastestreams are commingled are taken from the August 22, 1985, memo entitled " Guidance for NPDES Permits Issued to Steam Electric Power Plants." The oil and grease values of 0 mg/l monthly average and daily maximum for the yard drain component of the discharge come from this memo.

i J

q ,

.(,

Rationale.

Page 29 Using this data, the limitations at Outfall 012 are calculated as follows:

011 and Grease Monthly Average Limit O.008 (15) + 0.006 (0) - 8.6 mg/l (rounded to 9.0 mg/1) 0.014 011 and Grease Daily Maximum Limit 0.008 (20) + 0.006 (0) = 11.4 mg/l (rounded to 11.0 mg/1) 0.014 Since no exceedances of these limits are expected, monitoring is established at a frequency of 1/ month by grab sample to be consistent witti other outfalls discharging low volume wastes at this facility.

Total Iron

1. Form 2C Value: 0.646 mg/l daily maximum.

2. Previous Permit: 1.0 mg/l monthly average. 1.0 mg/l instantaneous maximum.

Effluent Guidelines: 1.0 mg/l monthly average and 1.0 mg/l daily 3

3.

maximum with adjustments for dilution.

4. Water Quality Criteria: 1.0 mg/l

5. Human Health Consideration: 0.3 mg/l (domestic water supplies)

6. Detection limit: <0.01 mg/1. l 7.._

Conclusion:

Effluent guidelines-based limitations of 1.0 mg/l i

i monthly average and 1.0 mg/l daily maximum are proposed for this discharge. l Nitrate-nitrite Form 2C Value: 0.574 mg/l ]

1. -

2. Previous Permitt none

3. Effluent Guidelines: Not applicable "

4. Water Quality Criteria: none

5. Drinking Water MCL: 10 mg/l X 110221 - 1102210 mg/l

. 6. Detection Limit: 0.02 mg/l  :

7.

Conclusion:

Based upon sampling data and reasonable potential procedures. no limit for nitrate-nitrite will be proposed. l Flouride

1. Form 2C Value: 0.117 mg/l l

2. Previous Permit: none i

3. Effluent Guidelines: Not applicable

4. Water Quality Criteria: none

5. Drinking Water MCL: 4.0 mg/l X 110221 - 440884 mg/l

6. Detection Limit: 0.01 mg/l

7.

Conclusion:

Based upon sampling data and reasonable potential

.~ .. . . ~.. m-mw. ::ew Rationale Page 30 t

proceduras. no limit for flouride will be proposed.

Sulfate

1. Form 2C Value: 33.1 mg/l

2. Previous Permit: none

3. Effluent Guidelinas: Not applicable

4. Water Quality Criteria: none

5. Drinking Water MCL: 250 mg/l X 110221 - 27555250 mg/l

6. Detection Limit: 0.005 mg/l

7.

Conclusion:

Based upon sampling data and reasonable potential procedures, no limit for sulfate'will be proposed.

Barium

1. Form 2C Value: 0.0353 mg/l

2. Previous Permit: none

3. Effluent Guidelines: Not applicable

4. Water Quality Criteria: 50 mg/l X 10899 - 544950 mg/l (ave) 100 mg/l X 10899 - 1089900 mg/l (max)

5. Human Health Consideration: 1.0 mg/l X 110221 = 110221 mg/l

6. Drinking Water MCL: 0.002 mg/l X 110221 - 220.4 mg/l

7. Detection Limit: 0.05 mg/l

8.

Conclusion:

Based upon sampling data and reasonable potential procedures, no limit for barium will be proposed.

Maanesium

1. Form 2C Value: 1.94 mg/l

2. Previous Permit: none

3. Effluent Guidelines: Not applicable

4. - Water Quality Criteria: 3.0 mg/l X 10899 - 32697 mg/l (ave) 6.0 mg/l X 10899 - 65394 mg/l (max)

5. Organoleptic: 100 mg/l X 110221 - 11022100 mg/l

6. Detection Limit: 0.05 mg/l

7.

Conclusion:

Based upon sampling data and reasonable potential procedures, no limit for magnesium will be proposed.

_Z1ILG

1. Form 2C Value: 0.182 mg/l t

2. Previous Permit: Not regulated 3.

Effluent Guidelines: Not applicable

4. Water Quality Criteria: 0.059 mg/l(10899) - 643 mg/l ave.

0.065 mg/l(10899) - 708 mg/l max.

5. Human Health Consideration:50 mg/l(110221) - 5511050 mg/l

6. Detection Limit: <0.01 mg/l -

7.

Conclusion:

Based on a comparison between the 2C value and water quality based limits, no limit for zine will be required.

Outfall 013 Outfall 013 discharges consist of storm water runoff from yard drains in the

2 1

i i

Rationale j Page 31 1

southeast area of the plant site. Overflows of lake water which has been j

filtered demineralized, and further purified may also occur. No treatment is Runoff from the yard drains may i provided prior to discharge to the Broad River. l contain suspended solids. Based on Best Professional Judgement (BPJ). monitoring ,

for Total Suspended Solids (TSS) and pH will be required to evaluate any  !

~

potential impacts on water quality. Sampling shall be required twice per year j during a discharge from this outfall. i Flow I Form 2C Value: 0.0052 MGD average. 0.01 MGD daily maximum.

1.

2. Previous Permit: Monitor and report. >

3. Effluent Guidelines: Not applicable. J

4. Water Quality Criteria: Not applicable.

Human Health Consideration: Not applicable. l

5. J

6. Detection Limit: Not applicable.

7.

Conclusion:

Monitoring requirements of estimate, taken twice per year as in the previous permit, remain appropriate and are imposed. .

Pli

1. Form 2C Value: 10 s.u. minimum.10 s.u. maximum.

2. Previous Permit: Monitor and re3 ort

3. Effluent Guidelines: Not applica)le.

4. Water Quality criteria (S.C. Regulation 61-69): The pH of the  ;

receiving waters shall be maintained between 6.0 and 8.5 standard r

units.

5. Human Health Consideration: Not applicable.

6. Detection Limit: Not applicable.

7 . .,

Conclusion:

The previous permit requirement of monitor and report twice per year will remain.

Total Susoended Solids (TSS.).

1. Form 2C Value: 2.0 mg/l maximum

2. Previous Permit: Monitor and report

3. Effluent Guidelines: Not applicable.

4. Water Quality Criteria: Not applicable.

5. Human Health Consideration: Not applicable.

6. Detection limit: <0.01 mg/1.

7.

Conclusion:

Monitor and report, as in the previous permit, shall continue.

~

4

Nitrate-nitrite

1. Form 2C Value: 0.574 mg/l

2. Previous Permit: none

3. Effluent Guidelines: Not applicable

4. Water Quality Criteria: none

5. Drinking Water MCL: 10 mg/l X 110221 = 1102210 mg/l

6. Detection Limit: 0.02 mg/l

7.

Conclusion:

Based upon sampling data and reasonable potential procedures, no limit for nitrate-nitrite will be proposed.

<. .. .s ~mamWEw. . .

Rationale Page 32 Flouride

1. Form 2C Value: 0.117 mg/l

2. Previous Permit: none

3. Effluent ' Guidelines: Not applicable

'4. Water Quality Criteria: none-

5. Drinking Water MCL: 4.0 mg/l X 110221 - 440884 mg/l

6. Detection Limit: 0.01 mg/l

7.

Conclusion:

Based upon sampling data and reasonable potential procedures, no limit for flouride will be proposed.

Sulfate -

1. Form 2C Value: 8.9 mg/l

2. Previous Permit: none

3. Effluent Guidelines: Not applicable

4. Water Quality criteria: none

5. Drinking Water MCL: 250 mg/l X 110221 - 27555250 mg/l

6. Detection Limit: 0.005 mg/l

7.

Conclusion:

Based upon sampling data and reasonable potential procedures, no limit for sulfate will be proposed.

Barium

1. Form 2C Value: 0.0171 mg/l

2. Previous Permit: none

3. Effluent Guidelines: Not applicable

4. Water Quality Criteria: 50 mg/l X 10899 - 544950 mg/l (ave) 100 mg/l X 10899 - 1089900 mg/l (max)

5. Human Health Consideration: 1.0 mg/l X 110221 - 110221 mg/l

6. Drinking Water MCL: 0.002 mg/l X 110221 - 220.4 ng/l

7. - Detection Limit: 0.05 mg/l

8.

Conclusion:

Based upon sampling data and reasonable potential procedures, no limit for barium will be proposed.

Maanesium

1. Form 2C Value: 1.94 mg/l

2. Previous Permit: none

3. Effluent Guidelines: Not applicable

4. Water Quality Criteria: 3.0 mg/l X 10899 - 32697 mg/l (ave) 6.0 mg/l X 10899 - 65394 mg/l (max)

5. Organoleptic: 100 mg/l X 110221 = 11022100 mg/l

6. Detection Limit: 0.05 mg/l

7.

Conclusion:

Based upon sampling data and reasonable potential procedures, no limit for magnesium will be proposed.

Manaanese

1. Form 2C Value: 0.0666 mg/l

2. Previous Permit: none

3. Effluent Guidelines: Not applicable

4. Water Quality Criteria: 1.0 mg/l (ave) 2.0 mg/l (max)

., l 1

i 1

Rationale l

. Page 33 i

j

5. Human Health: 0.05 mg/l

6. Detection Limit: 0.01 mg/l

7.

Conclusion:

Based upon sampling data and reasonable potential procedures, no limit for manganese will be proposed.

l Zinc '

=1. = Form 2C Value: 0.0207 mg/l

~

2. Previous Permit: Not regulated

3. Effluent Guidelines: Not applicable

4. Water Quality Criteria: 0.059 mg/l(10899) - 643 mg/l ave.

0.065 mg/l(10899) - 708 mg/l max.

5. Human Health Consideration:50 mg/l(110221) - 5511050 mg/l

6. Detection Limit: <0.01 mg/l

7.

Conclusion:

Based on a comparison between the 2C value and water quality based limits, no limit for zine will be required.

~

Outfall 014 Outfall 014 has been created to represent the combined Internal Outfalls 005.

006A. 006B. 008, and 011 which consist of sanitary sewerage and low volume wastes discharged at an average rate of 0.14 MGD (the sum of the Internal Outfalls' flows). Outfall 014 will be used to apply water quality-based limitations prior to discharge to Monticello Reservoir.

Flow

1. Form 2C Value: 0.12 MGD ave. 2.0 MGD max.

2. Previous Permit: Not regulated

3. s Effluent Guidelines: Not applicable.

4. . Water Quality Criteria: Not applicable.

5. Human Health Consideration: Not a

6. Detection Limit: Not applicable. pplicable.

7.

Conclusion:

Continous flow monitoring will be required since an in-line flow meter is used at this outfall.

RB

1. Form 2C Value: 6.59 s.u. minimum. 7.85 s.u. maximum.

2. Previous Permit: 6.0 s.u. to 8.5 s.u.

. 3. Effluent Guidelines: Not applicable.

4. Water Quality Criteria (S.C. Regulation 61-69): The pH of the receiving waters shall be maintained between 6.0 and 8.5 standard units.

5. Human Health Consideration: Not a

~ 6. Detection Limit: Not app'iicable. pplicable.

7.

Conclusion:

Based on the stream standard. 6.0 s.u. minimum and 8.5 s.u. maximum is adopted in the permit.

Total Residual Chlorine

1. . Form 2C Value: <0.1 mg/l

2. Previous Permit: <0.1 mg/l

. . . . . . ~ . .

.. . .. ....mxwsgn.mt.;s..y.. .gyy :. ..;

' ~

Rationale' Page 34 .

l i

3. Effluent Guidelines: Not applicable.

4. Water Quality Criteria: 0.011 mg/l chronic. 0.019 mg/l acute allowable freshwater instream waste concentration.

5. Human Health Consideration: Not applicable.

6. Detection limit: <0.05 mg/1.

7.

Conclusion:

The regulation of chlorine is being considered at this outfall as a result of the addition of chlorine containing chemicals at Internal Outfalls 005. 006A. and Oll, which contribute to Outfall 014. Water quality-based limits of 0.011 mg/l monthly average and 0.019 mg/l daily maximum are proposed.

Cocoer

1. Form 2C Value: <0.01'mg/l

2. Previous Permit: 0.028 mg/l monthly average. 0.039 mg/l daily maximum.

3. Past DMR Data (.95-97): 0.032 mg/l max.

4. Effluent Guidelines: NA

5. Water Quality Criteria: 0.0065 mg/l monthly average. 0.0092 mg/l daily maximum

6. Human Health Consideration: 1.0 mg/l instream waste concentratioc.

7. Detection limit: <0.01 mg/1.

8.

Conclusion:

Based or, a comparison between the Water Quality l Criteria and DMR data, a limit must be imposed. Water Quality limits of 0.0065 mg/l monthly average and 0.0092 mg/l daily maximum are proposed at this discharge point.

Zinc

1. . Form 2C Value: <0.02 mg/l 2,

• Previous Permit:0.059 mg/l (ave). 0.065 mg/l (max)

3. Past DMR Data (95-97): 0.046 mg/l max

4. Effluent Guidelines: Not applicable

5. Water Quality Criteria: 0.059 mg/l ave.

0.065 mg/l max.

6. Human Health Consideration:50 mg/l

7. Detection Limit: <0.01 mg/l

8.

Conclusion:

Based on a comparison between past sampling data and Water Quality Criteria. the limit for zinc will continue as in the

. previous permit.

Flouride

1. Form 2C Value: 0.119 mg/l

2. Previous Permit: none

-3. Effluent Guidelines: Not applicable j

4. Water Quality Criteria: none 1

5. Drinking Water MCL: 4.0 mg/l

6. Detection Limit: 0.01 mg/l

7.

Conclusion:

Based upon sampling data and reasonable potential procedures, no limit for flouride will be proposed.

4

-( ,

d 1

Rationale 1 Page 35 L

Nitrate-nitrite  ?

1. Form 2C Value: 0.48 mg/l 2.. Previous Permit: none

3. Effluent Guidelines: Not applicable ,

4. Water Quality Criteria: none <

5. -Drinking Water MCL: 10.mg/l .

6. Detection Limit: 0.02 mg/l

7.

Conclusion:

Based upon sampling data and reasonable potential procedures, no limit for nitrate-nitrite will be proposed.

Sulfate

1. Form 2C Value: 7.96 mg/l

2. Previous Permit: none

'3. Effluent Guidelines: Not applicable

4. Water Quality Criteria: none

5. Drinking Water. MCL: 250 mg/l

6. Detection Limit: 0.005 mg/l

7.

Conclusion:

Based upon sampling data and reasonable potential procedures, no limit for sulfate will 'be proposed.

Barium

1. Form 2C Value: 0.015 mg/l

2. Previous Permit: none

3. Effluent Guidelines: Not applicable

4. Water Quality Criteria: 50 mg/l 100 mg/l

5. Human Health Consideration: 1.0 mg/l

6. .. Drinking Water MCL: 0.002 mg/l (ave)

7. Detection Limit: 0.05 mg/l (max)

8.

Conclusion:

Based upon sampling data and reasonable potential procedures, no limit for barium will be proposed.

Iron ,

i

1. Form 2C Value: 0.06 mg/l

2. Previous Permit: none )

3._ Effluent. Guidelines: Not applicable 1

^

4. Water Quality Criteria: 1.0 mg/l (ave) 2.0 mg/l (max)

5. Organoleptic: 0.3 mg/l

6. Detection Limit: 0.02 mg/l

7.

Conclusion:

Based upon sampling data and reasonable potential procedures', no limit for iron will be proposed.

^

Maanesium

1. Form 2C Value: 1.59 mg/l

2. Previous Permit: none

3. Effluent Guidelines: Not applicable

4. Water Quality Criteria: 3.0 mg/l (ave) 6.0 mg/l (max)

Rationale Page 36

5. Organoleptic: 100 mg/l

6. Detection Limit: 0.05 mg/l

7.

Conclusion:

Based upon sampling data and Water Quality criteria.

3.0 mg/l (ave) and 6.0 mg/l (max) will be proposed as a limit for Magnesium.

D. Chemical Additives -

1. Water Additives t a. The following chemicals have been forecasted to be used as cooling water additives over the life of this permit:

Ammonia: 006A, 006B Hydrazine: 008 Chlorine compounds: 002, 014, 003 Sodium Hydroxide: 003, 007, 001 Sulfuric Acid: 001 Boron Compounds: 003, 008, 001, 014 Hydrogen Peroxide: 003

., Benzotriazole: 003 Hydroxyethylidenediphosphonata(HEDP): 003 Sodium Bicarbonate: 003 j i

Sodium Metasilicate: 003, 012. 014 j Sodium Molydate Dihydrate: 003

. Sodium Nitrite: 003 Sodium Nitrate / Sodium Borate: 014, 006B, 008 Lithium Hydroxide: 003 Potassium Chromate, Potassium Hydroxide, Potassium Dichromate:

003 Duratek, D-261. D-230, D-70 (Sulfate containing resin): 003 Biocides I

} .

Rationale Page 37 J

J Betz CT-2: 001 ]

Calgon-CS: 003 )

.Slimicide C-77P:

Betz 1190 (Polymer): -008 l

~~

b. Biocides -- The facility shall notify the South Carolina Department of Health and Environmental Control in writing no later than (60) days prior to instituting use of any l

. additional biocide or chemical used in the cooling system, which may be toxic to aquatic life other than those previously f reported to the Environmental Protection Agency. Such notification shall include:

1. Name and general composition of biocide or chemical:

1

2. Quantities to be used: i+

3. Frequencies of use:

4. Proposed discharged concentration: and

5. EPA registration number if applicable.

2. Hazardous Substances The Permittee has identified the compounds in 1.a. above as being -

possible dischargos from the facility. Possible effects have been evaluated at each separate outfall.

1 i

Sludae Disoosal j E.

The Permittee will be required to obtain prior written approval for any  :

sludge disposal activities at this facility.  ;

- F. Ooerator l

The Permittee's present treatment system consists of sedimentation and neutralization. The highest.. classification of the operation of all treatment equipment is usually used to determine the operator requirement.

Based on the wastewater treatment system classification, an operator with i a Grade B-B12 or higher certification is required to accept the responsibility of inspections made by lower grade operators.

G. Co-Treatment Where various wastes are combined for treatment and discharge 40 CFR 423.13(h) requires that the quantity of each pollutant or pollutant property not exceed the specified liinitation for that waste source.

__,y Rationale Page 38 Applicable effluent guidelines concentrations were flow weighted in calculating final effluent concentrations.

H. Toxicity Testina Since the chemical specific approach does not address all specific chemicals and their interactions with other components in the wastestream, a more comprehensive testing requirement is needed. To ensure that water quality is not deteriorated, whole effluent toxicity testing is being required at Outfalls 001, 002, and 014 in accordance with procedures set out in The South Carolina Deoartment of Health and Environmental Control Toxic Control Strateay for Wastewater Discharoes. South Carolina Department of Health and Environmental Control. October 1990. These procedures require either acute or chronic toxicity testing based on whether a diffuser (IWC), which .is used and is calculated the Instream Waste Concentration as follows:

IWC for Monticello Reservoir:

IWC

= (Effluent flow /(7010 flow + Effluent flow)) X 100

= (782.9386/(0 + 782.9386))

= 100%

Based on State procedures, if a diffuser is not installed and the IWC is between 80% and 100%. chronic toxicity testing is required.

IWC for Broad River:

IWC

= (Effluent flow /(7010 flow + Effluent flow)) X 100

= (0.04744/(629 + 0.04744))

= 0.01%

l Based on State procedures, if a diffuser is not installed and the IWC is between 0% and 1%. acute toxicity testing is required. ,

J Therefore, as in the previous permit, chronic toxicity at 100% effluent  !

will be required to be conducted at Outfalls 001. 002 (when discharging directly to Monticello Reservoir only). 014 and acute toxicity screening i

at 100% effluent will be recuired to be conducted at Outfall 012. Acute '

testing will not be requirec at Outfall 003: this wastestream discharges to the penstocks of Fairfield Hydro where it is thoroughly mixed before final release to the Broad River. In the previous permit, testing was performed at a frequency of once per month. After twelve consecutive acceptable test results the frequency may be reduced at the Department's discretion. Outfalls 001, 012. and 014 meet this criteria; therefore it l is proposed that the sampling frequency be reduced to once per quarter.

Sampling for 002 will continue as once per month. The frequency may be reduced later at the Department's discretion. The specific toxicity I

4 h

b.

Rationale g Page 39 testing language and requirements are included in Part III of the permit. . .

i K. Other Reouirements

1. The Permittee shall continue to maintain a Best Management Practices i (BMP) plan to identify and control the discharge of significant amounts of oils and the hazardous and toxic substances listed in 40 CFR Part 117 and Tables II and III of A3pendix D to 40 CFR Part 122. -

The plan shall include a listing of all potential sources of spills  :

or leaks of these materials, a method for containment, a description of training, inspection and ncurity procedures, and emergency .

response measures to be taken in the event of a discharge to surface waters or plans and/or procedures which constitute an equivalent BMP. Sources of such discharges may include materials storage areas: in-alant transfer. process and material handling areas:

loading and unloading operations; plant site runoff; and sludge and waste disposal areas. The BMP plan shall be developed in accordance with good engineering practices, shall be documented in narrative form, and shall include any necessary plot plans, drawings, or maps.

The BMP plan shall be maintained at the plant site and shall be available for inspection by EPA and Department personnel.

- - - * + ~..., _ _._ _ _ , , , , ,

vh*4e e

- . . . ~ . -. - ...

... . .-_.. . .,. . . r . . . . . .m. 2.. . <.ww.i. awsu .mcauM SOUTH CAROLINA DEPARTMENT OF HEALTH AND ENVIRONMENTAL CONTROL 2600 Bull Street Columbia, South Carolina 29201 FACT SHEFT APPLICATION FOR NATIONAL POLLUTANT DISCHARGE ELIMINATION SYSTEM PERMIT TO DISCHARGE TREATED WASTEWATER TO STATE WATERS Application No. SC0030856 Date: Aunist 18.1997 A. SYNOPSIS OF APPLICATION

1. Name and Address of Applicant South Carolina Electric & Gas Company /V.C. Summer Nuclear Station P.O. Box 88 Jenkinsville, South Carolina 29065 l

{

2. Description of Applicant's Operation Nuclear Fuel Steam Elecnic Generation

3. Production Capacity of Facility 945 megawatts

4. Applicant's Receiving Waters Monticello Reservoir & Broad River For a sketch showing the location of the discharge (s) )

(See Figures). I

g i l

5. Description of Existing Pollution Abatement Facilities

- _. A wastewater treatment system consisting of sedimentation, neutralization, and 1 precipitation. A wastewater treatment plant for sanitary wastewater consisting of sedimentation, activated sludge, disinfection, and filtration. A Liquid Radwaste treatment system consisting of filtration, ion exchange, and evaporation. A metal cleaning waste treatment system consisting of neutralization and precipitation. ,

l

6. Description of Discharges (as reported by applicant)  :

Outfalls 001 - 014 - (See Rationale)

Pollutants which are present in significant quantities or which are subject to effluent limitations are as follows .

i Effluent Characteristics Reported Load (See Rationale)

7. Proposed Effluent Limitations

_Outfalls 001 - 014 - (See Part I.A.)

Effluent Characteristics Discharge T. imitation (See Part I.A.) (See Part I.A.)

8. MONITORING REQUIREMENTS The applicant will be required to monitor regularly for flow and those parameters limited in Section 7 above with sufficient frequency to ensure compliance with the permit conditions. Frequency, methods of sampling, and reporting will be specified in the final permit.

9. Proposed compliance schedule for attaining effluent limitations (See Part I.B.)

10. Proposed special conditions which will have a significant impact on the discharge (See Part III.A)

11. Water quality standards and effluent standards applied to the discharge This permit draft was written in conformance with EPA Guidelines for the Steam Electric Power Generating Point Source Category (40 CFR l Part 423), Best Professional Judgement, Standard Bureau Operating Procedures, and Water Quality Considerations.

B. PROCEDURES FOR THE FORMULATION OF FINAL DETERMINATIONS 1

,. . . . . . 1,... .. . ~ ... ..._;..n...- ..w. .,.:angcygm . .

1. Comment Period. .

The Department of Health and Environmental Control proposes to issue an NPDES permit to this applicant subject to the effluent limitations and special conditions outlined above. These determinations are tentative.

Interested persons are invited to submit written comments on the permit application or on DHEC's proposed determinations to the following address:

- South Carolina Department of Health and Environmental Control NPDES Administration 2600 Bull Street Columbia, South Carolina 29201 All comments received prior to (See Public Notice) will be considered in the formulation of final determinations with regard to this application.

2. Public Hearing The Department of Health and Environmental Control Commissioner may hold a public hearing if there is a significant degree of public interest in a proposed permit or group of permits. Public notice of such a hearing will be circulated in newspapers in the geographical area of the discharge and to those on the DHEC mailing list at least thirty days prior to the hearing.

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Following the public hearing, the Commissioner may make such modifications in the f terms and conditions of the proposed permit as may be appropriate and shall issue or deny the permit. Notice of issuance or denial will be circulated to those who participated in the hearing and to appropriate persons on the DHEC mailing list.~ j

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If the permit is issued, it will become effective the first of the month following date of issuance and will be the final action of DHEC unless an adjudicatory hearing is j granted.

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3. _ Adjudicatory _ Hearings Any person may submit a request for an administrative adjudicatory hearing to i consider the final permit and its conditions. If you wish to request an administrative adjudicatory hearing, such request must be made in accordance with Regulation 61- s 79, Volume 25, S.C. Code of laws,1976, as amended. As required by this '

regulation, two (2) copies of the request must be served on the South Carolina Board j of Health and Environmental Control,2600 Bull Street, South Carolina 29201, j within fifteen (15) days following issuance of the permit. Service may be effected by .

personal delivery or by first class mail. i The following elements must, at a minimum, be included within the request:

a. A title indicating the nature of the proceeding and the parties involved;

b. The complete name and address of the party filing the pleading and, if applicable, the organization (s) or interests which he represents;

c. If the requesting party is to be represented by counsel, the name and address of the attorney;

d. A clear and concise statement of the requesting party's affected interest;

e. A clear and concise statement of the issues upon which the request is based and, where applicable, the contested sections of the permit. (It should be noted that any uncontested portions of the permit will become effective according to

. its terms on the effective date specified in the permit).

f. A statement of the relief sought by the requesting party.

_ ._ . In the event that such a request is filed for review of a decision to renew a pennit for an ongoing activity, the renewed permit is stayed and the previous permit remains in effect pending completion of administrative review. ' A petition for review of a decision to issue a new permit stays all actions for which the permit is a prerequisite.

Final determination of permit conditions following an adjudicatory hearing will be in accordance with Regulation 61-72.

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Information pertaining to adjudicatory matters may be obtained by contacting the Legal Office of the Department of Health and Environmental Control,2600 Bull Street, Columbia, South Carolina or by calling 803/734-4910.

4. Issuance of the Permit when no Hearings are Held If no public hearing or adjudicatory hearing is held, and, after review of the comments received, DHEC's determinations are substantially unchanged, the permit willissue and become effective the first of the month following date ofissue.~ This will be the final action of the Department of Health and Environmental Control.

If no hearing is held, but there have been substantial changes, public notice of DHEC's revised determination will be made. Following a 15-day comment period, the permit will be issued and become effective the first of the month following termination of the 15-day comment period and will be the final action of Department of Health and Environment Control, unless an adjudicatory hearing is granted.

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