Text

NPDES Permit CT0003263,issued to Northeast Nuclear Energy Company
	ML20126M600
Person / Time
Site:	Millstone
Issue date:	12/15/1992
From:	Moore R; CONNECTICUT, STATE OF
To:	;
References
	CT0003263, CT3263, NUDOCS 9301110049
	Download: ML20126M600 (48)
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. i. . d f ~1 STATE OF CONNECTICUT a k DEPARTMENT OF ENVIRONMENTAL PROTECTION -

.- ~ l CERTIFY THAT THIS DOCU N.., #( NPDrs PERMIT TRUE COPY OF THE ORIGINAL. !

Northeast Nuclear Energy Company N II.k P.O. Box 270 -

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Hartford, CT 06141-0270 RECinVED DMA DEC 151992 Re: Facilityhh(

Town of V h>of

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'"82'l'"g# b N*th'd R.G.C. r Attention: Mr. R.A. Reckert, Vice President This permit is issued in accordance with Section 22a-430 of Chapter 446k, Connecticut Ceneral Statutes, and regulations adopted thereunder, as amended, pursuant to an approval dated September 26, 1973, by the Administrator of the United States Environmental Protection Agency for the State of Connecticut to administer : N.P.D.E.S. permit program.

Your application for permit reissuance submitted by Northeast Utilities Service Company on December 1, 1989, has been reviewed by the Connecticut Department of Environmental Protection.

The discharge is subject to the effluent guidelines and standards for the steam electric power generating point source category promulgated on November 19, 1982 pursuant to Section 301 of the Federal Clean Vater Act, as amended.

Specifically, this discharge is subject to 40 CFR Parts 125 and 423 of the effluent guidelines and standards.

The Commissioner of- Environmental Protection (hereinafter "the Commissioner') has determined that the effluent limitations'which would require the-use of cooling systems at the Hillstone Nuclear Power Station, Units 1, 2 and 3 other than the existing once-through system utilized by the applicant for the control of the thermal component of the applicant's discharge are _more stringent than necessary to assure the protection _and propagation of a balanced indigenous population of shellfish, fish and v11dlife in and on : the receiving j vaters. In the view of this finding, the Commissioner has herein established

. alternative and less stringent effluent limitations in accordance with Section 316(a) of the Clean Vater Act.

However, the Commissioner has also determined that - additional evidence based upon actual operating experience of Hi11 stone Nuclear Power . Station, Units 1, 2 and 3 would be desirable in order to corroborate the Commissioner's findings. The Commissioner expressly reserves the right to ' impose more stringent effluent limitations with respect to the thermal component of the q Company's discharge pursuant to - Se'etion 22a-430 of Chapter 446k, Connecticut General Statutes should further'-investigation of the 'effect of the Company's ,

I discharge; fail' to corroborate the Commissioner's -determination that. more stringent effluent limitations are- not necessary to assure the protection and propagation of a balanced indigenous population of the shellfish, fish and-

. vildlife in and on the receiving vaters. Such data ' vill; be generated by the studies to be-conducted pursuant to paragraph 5. of this permit.

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l The Commissioner has determined that the location, design, construction and capacity of the cooling vater intake structure represents the best available technology for minimizing adverse environmental impact from iepingement and entrainment pursuant to Section 316(b) of the Federal Act. The Commissioner has also determined that additional evidence based upon actual operating experience of Hillstone 14uclea r Power Station, tlnits 1, 2 and 3 vould be desirable in order to corroborate the Commissioner's findings. Such data vill be generated by the studies to be conducted pursuant to paragraphs 5. and 8. of this permit.

The Permittee should take cognizance of the fact that additional evidence say result in the imposition of more stringent requirements and the potential utilization of a cooling system other than the one utilized. Accordingly, the company should take this potential into consideration in their design wherever feasible.

Your discharge toxicity evaluation (DTE), submitted by teortheast Utilities Environmental Laboratory on December 28, 1988, has been reviewed by the-Connecticut Department of Environmental Protection, has been found to be consistent with Section 22a-430-4(c)(21) of the Regulations of Connecticut State Agencies and is hereby approved in accordance with Section 22a-430 of Chapter 446k, Connecticut General Statutes.

The Commissioner has found that the discharges vill not cause_ pollution of the waters of the state when all the conditions of this permit have been met.

-This action is further found to be consistent with the applicable policies of the Connecticut Coastal Management Act (Section 22a-92 of the Connecticut General Statutes).

The Commissioner has determined that Northeast Nuclear Energy Company is in 1985. The full compliance with Order ID. VC4107 entered on October 18, Commissioner, acting under Section 22a-430, hereby permits Northeast Nuclear Energy Company to discharge vastevaters in accordance with the following conditions:

1. The vastevaters shall be collected, treated and/or discharged in accordance with the above referenced application and all approvals issued by the Commissioner or his authorized agent for the discharges and/or activities authorized by or associated with this permit.

2. Monitoring and reporting of radioactive liquid releases are performed in accordance with 10 CFR 20 ' Standards for Protection Against Radiation'.

Biannual monitoring reports are submitted to the Federal' Nuclear Regulatory Commission and the Connecticut Department of Environmental Protection, Bureau of Air Management, Radiation- Control Division. Monitoring and reporting includes:

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3 a) Gross radioactivity (less tritium, gases and alpha)

1) total release (curies)

2) average concentration released (uC1/ml) b) Tritium

1) total release (curies)

2) average concentration released (uci/ml) c) Dissolved gases

1) total release (curies)

2) average concentration released (uci/ml)

Gross alpha d)

1) total release (curies)

2) average concentration released (uci/ml) e) Volume of liquid vaste discharged (liters) f) Volume of dilution-vater (liters) g) Isotopes released (curies) h) Percent of 10 CFR 20. Appendix B. Table II for total release

1) Percent of technical specification limit if different from 10 CFR 20, for the total release if such specifications are established by N.R.C.

3. The discharges shall not exceed and shall otherwise conform to specific terms and conditions listed below. The discharges shallDMR be monitored and Processing) by results reported to the Vater Management Bureau (Attni the end of the month after the month in which samples are taken according to the following schedules A. Discharge Serial No. 001-1 Monitoring Location: 1 Descriptioni Discharge Points at Quarry Cut (East & Vest)

(Discharge Code 102000a)

Receiving Stream Long Island Sound (Basin Code-2000)

Present/ Future Water Quality Standard: SA/SA Haximum Daily Flows 2,738,000.000 gallons per day (1) The pH of the - discharge shall not be less than 6.0 or greater than 9.0 (Code 00400-012).

(2) The dischbrge shall not contain or cause in the receiving waters

a visible oil sheen or floating solids.

(3) The discharge shall not cause visible discoloration or foaming in the receiving vaters.

(4) The maximum; temperature of the discharge shall be 105 F and the maximum temperature increase at the ' Quarry Cut above' the intake water temperature shall be 32 F.

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(5) The differential temperature increase at the Quarry Cut above the under unusual conditions -may be intake water gemperature increased to 44 F for a_ period not exceeding 24 hours2.777778e-4 days 0.00667 hours 3.968254e-5 weeks 9.132e-6 months . In the event the temperature dif f erential exceeds 32 F, the Department I

of Environmental Protection shall be immediately notified and a written report of the incident filed.

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(6) The permittee shall operate all facilities in such a manner as not to raise the average tetPerature of the receiving waters more than 4F or ingrease the normal temperature of the receiving waters above 83 F. For purposes of this condition, cognizance vill be given to reasonable time and distance to allow mixing of effluent and receiving waters, but the boundary of the mixing zone shall not exceed a radius of 8.000 feet from the discharge outlet at the quarry cut.

(7) The thermal plume allowed within the permissible mixing zone as defined by these conditions shall not block zones of fish passage.

(8) The discharge and operation of all facilities shall not alter significantly the color, turbidity, taste, odor or levels of coliform bacteria from ambient levels in the receiving vaters; nor shall the level of dissolved oxygen in the receiving vaters fall belov 5.0 mg/l as a result of such discharge.

(9) The total residuni chlorine concentration in the discharge at the Quarry Cut shall not exceed 0.1 mg/l at any time.

(10) Free available chlorine shall not be discharged in the condenser cooling water of any one unit for more than two hours in any one day.

(11) Free available chlorine shall not be discharged in the condenser cooling vater of more than ene unit at any one time.

(12) The discharge shall contain no other chemical constituents in '

concentrations and combinations which are harmful to human.

animal or aquatic life, or which make the waters unsafe or unsuitable for fish or shellfish or their propagation, impair the palatability of same, or impair the waters for others uses.

Maximum Minimum Instant. Frequency Sample Parameter Code Limits of Saeoline Tyne 00400-012 See (1) Above Hourly (c) Instantaneous pH 00011-015 See (4) Above Hourly Instantaneous Temperature Free Available 50064-019 Veekly Grab Chlorine Total Residual 50060-019 0.1 mg/l Veekly Grab Chlorine

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(a) Report the following data:

1) Daily range of pH

2) Daily range of flov

3) Daily maximum temperature ( F)

4) Daily minimum temperature

5) Daily average temperature

6) Monthly standard deviation of temperature

7) Daily maximum temperature increase

8) Daily minimum temperature increase

9) Daily average temperature increase

10) Monthly standard deviation of temperature increase

11) Monthly maximum heat load (BTU /hr.)

12) Honthly minimum heat load

13) Monthly average heat load

14) Honthly maximum rate of change of heat load

15) Honthly standard deviation of heat load (b) The permittee shall record the instantaneous flov (Code 00058-078) at the time of grab sample collection.

(c) The permittee shall monitor pH manually every four hours whenever the automated pH monitoring equipment malfunctions.

(d) The report shall include a detailed explanation . of any viciations of the limitations specified above.

B. Discharge Serial No. 001-A Monitoring Locations 1 Description Unit No. 1 Discharge (Discharge Code 102000a)

Haximum Daily Flow: 604,g00,000gallonsperday Maximum Temperature: 105 F Average Design Tec:perature Increase: 22.5 F (1) The maximum temperature increase at the Unit No. 1 - discharge above the-intake-vater temperature shall be 32 F.

(2) -ThedifferentialtemperatureincreaseattheUnitNo.1disgharge above the intake water temperature may be increased to 44 F for a ' period .. not exceeding 24 hours2.777778e-4 days 0.00667 hours 3.968254e-5 weeks 9.132e-6 months - under -conditions of reduced' cooling water flov.- In- the event the temperature differential exceeds. 32 F, . the Department of : Environmental Protection shall.

be notified in the monthly monitoring report.

(3) The normal operating procedures include, usually. not more than 12 times a year, the elevation of the intake ' vater temperature on each condenser by a thermal backvash process required for the control of sea musse' . The true' temperature' difference between the receiving s t r e at., anc discharge water shall be allowed to exceed'the permit limit for brief periods-during this' treatment schedule.

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(4) Free available chlorine shall not be discharged in the condenser cooling vater for more than two hours in any one day. Free available chlorine shall not be discharged in the condenser cooling vater of more than one unit at any one time.

(5) The pH of the discharge shall not be less than 6.0 or greater than 9.0 (Code 00400-012).

Maximam Minimum Instant. Frequency Sample Parareter code Limits of Saeoline Type -

See paragraph Quarterly Daily Composite Aquatic Toxicity. C0019-09A Acute 3.B. (6) below See paragraph Quarterly Daily Co=posite Aquatic Toxicity. C0020-09A Chronic 3.B. (6) below 74076-007 Hourly Instantaneous Flov Hourly (b) Instantaneous pH 00400-012 Temperature F 00011-015 ,

Hourly Instantaneous 50064-019 0.25 mg/l Veekly (c) Grab Free Available Chlorine Free Available 50064-001 573.04 Veakly (b) Grab Chlorine kg/d (a) Report the following data:

1) Daily range of pH -

2) Daily range of flov

3) Daily maximum temperature ( F)

4) Daily minimum temperature

5) Daily average temperature

6) Honthly standard deviation of temperature

7) Daily maximum temperature increase B) Daily minimum temperature increase

9) Daily average temperature increase

10) Honthly standard deviation of temperature increase

11) Honthly maximum heat load (BTU /hr.)

12) .Honthly minimum heat load

13) Honthly average heat load

14) Honthly maximum rate of change of heat load

15) Honthly standard deviation of heat load

16) Total flow during chlorination period each sampling day

.17) Total daily flow (b) The permittee . shall- conitor pH manually every four hours whenever the automated pH monitoring equipment malfunctions.

(c) Whenever Unit No. 1 is operating, veekly monitoring of free available chlorine shall be performed when chlorination of condenser cooling water occurs.

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(d) The report shall include a detailed explanation of any violations of the limitations specified above.

(6) Effective upon issuance and thereafter a daily composite sample of the effluent shall not exhibit acute or chronic toxicity in the receiving vaterbody.

(a) Compliance with this permit condition shall be achieved when:

(1) the Daily Flov of the discharge is greater than or no equal to 43,200,000 gallens and there is significant mortality in a daily composite - sample of the effluent at a concentration equal to or greater-than an 110AEL = 100% as determined by the pass / fail-methodology in Section 22a-430-3(j)(7)(A) of the Regulations of Connecticut State Agencies: or Daily Flov of the discharge is less than (11) the 43,200,000 gallons and there is no significant mortality in a daily composite sample of the ef fluent at a concentration equal to or greater than an NOAEL =

452 as determined by the pass / fail methodology in Section 22a-430-3(j)(7)(A) of the Regulations of Connecticut State Agencies.

(b) Honitoring to determine compliance with this limit'shall_be performed Quarterly (January, April, July, _0ctober)_

following the toxicity testing protocol for static acute toxicity tests in

Methods for Hessuring -the Acute Toxicity of Effluents to Freshwater and Marine Organisms' - (EPA 600/4-85/013) with the following specifications:

(i) Mvsidonsis b.Ahla (5 days old or less) and Cvorinodon varfecatus (30 4/- 5 days old) shall be used as test organisms.

(ii) Synthetic or natural seavater-adjusted to-a salinity of 28 32 ppt shall be - used as . dilution water in the tests.

(iii) Test duration shall be 48 hours5.555556e-4 days 0.0133 hours 7.936508e-5 weeks 1.8264e-5 months for Hvsidonsis behin M!D 96 hours0.00111 days 0.0267 hours 1.587302e-4 weeks 3.6528e-5 months for Cvorinodon varlecatus.

(c) Any test in which , the _ survival . of test organisms is less than ninety _ (90) percent in each replicate control . test chamber . or. f ailure to achieve test conditions as specified in Section' 22a-430-3 (j ) (7) ( A) of: the Regulations' . of Connecticut State Agencies, such as maintenance- of-appropriate environmental controls, shall constitute; an invalid test and vill require immediate retesting. Failure l'

' to submit valid test results constitutes,.a permit violation.

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(d) Results of the toxicity tests required asthe partDischarge of this condition shall be entered on permit Monitoring keport (DHR) for the month in which it code. was performed, using the appropriate parameter Additionally, complete and accurate test data, including all performed in supporting chemical / physical measurements well as association with the toxicity tests,- as dose / response data shall be entered on the Aquatic Toxicity Monitoring Report form (ATMR). The ATHR shall be sent to the following address:

Aquatic Toxicity Connecticut Department of Environmental Protection Vater Compliance Unit 122 Vashington Street Hartford, CT 06106 (e) If any test result indicates that the maximum daily toxicity.

limit for the effluent has been exceeded, a.second sample of the effluent shall be collected and tested as described above and the results reported to the Commissioner within 30 days of the receipt of the first set of test results.

(f) If any two consecutive test results or any three test results in a single year indicate that the maximum daily toxicity limit has been exceeded, the permittee shall immediately take all reasonable steps to eliminate toxicity wherever possible and shall submit a report for the revity and approval of the Commissioner in accordance with Section 22a-430-3 (j ) (10) (c ) of the Regulations of Connecticut State Agencies describing proposed steps to eliminate theSuch toxica impact of the discharge on the receiving vaterbody.

report shall include a proposed time schedule to accomplish toxicity reduction.

(7) The discharge shall contain no net increase in any of ' the metal parameters listed belov, except as allowed in accordance with this permit. Sampling chall be conducted concurrently at both-the intake and effluent at the frequency stated.

Minimum Frequency Sample of Sampline Tyne Parameter Code 01042-028 Quarterly Daily Composite Total Copper c Daily Composite Total Lead 01051-028 Quarterly 01067-028 Quarterly' Daily Composite Total Nickel Quarterly Daily Composite Total 2inc

01092-028.

00610-028 Quarterly Daily Composite Ammonia - N Daily Composite Total Suspended Solids 00530-028 Quarterly 38260-028 Quarterly _ . Daily Composite Surfactants- Anionic Oil & Grease. T 70030-028 Quarterly- Grab

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C. Discharge Serial No. 001A-1 Honitoring Location: 1 Description Unit No. 1 Radiation Vaste Sampling Tank Dircharge (Discharge Code 1170000)

Maximum Flow per Batch 30,000 gallons Maximum Frequency of Discharge: One per day Expected Frequency: One per day Hinimum Frequency Sample of Saroline Tvre Perareter Code Veekly Grab ,

Specific 00095-011 Conductivity 00400-012 Veekly Grab pH (n) The permittee shall record the total flov (Code 74076-007) and the number of hours of discharge (Code 81381-079) for each day of sample collection.

(b) The report shall include a detailed explanation of any violations of the limitations specified above.

(c) Radiation monitoring is peilormed in accordance .vith Paragraph 2. above.

D. Discharge Serial No. 001A-2 Honitoring Location: 1 Description Unit No. 1 Floor Drain Radiation Sample Tank (Discharge Code 153000N)

Maximum Flow per Batcht .14,000' gallons Maximum Frequency of Discharges Two per day Expected Frequency: One per day (1) The maximum concentration. specified belov shall not be exceeded at any time.

Maximum Maximum Minimum Quantity Concentration Frequency Sample Per Batch Par Patch of Samoline Tvee-Parameter Code

-Total Suspended 00530-019-1.9 kg 45.0 mg/l Veekly- . Grab -

Solids Grab

-pH 00400-012 Veekly

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(a) The permittee shall recor'd the total flov (Code 74076-007)

' and' the number of hours of . discharge (Code 81381-079) for each day of sample collection.

(b) The report shall ~ include a detailed . explanation of any violations of the limitations specified above. ..

10 Radiation monitoring is performed in accordance with (c)

Paragraph 2 above.

I. Discharge Serial No. 001A-2(a)

Monitoring Location: 1

Description:

Long Term Freon Distillation Unit Discharge (Discharge Code 1150080)

Maximum Flow per Batch 220 gallons Maximun Frequency of Discharge: One per day Expected Frequency: Five per year (1) The maximum concentrations specified belov shall not be exceeded at any time.

Maximum Minimum Concentration Frequency Sample Per Patch of Samoline Tvoe Parameter Code ___

2.0 mg/l Daily (c) Grab Freon 70015-019 20.0 mg/l Daily (c) Grab 011 & Grease, 70030-019 Total (a) The permittee shall record the total flov (Code 74075-007) and the number of hours of discharge (Code 81381-079) for each day of sample collection.

(b) The report shall include a detailed explanation of any violations of the limitations specified above. _

(c) Sampling daily required only when discharge occurs.

F. Discharge Serial No. 001A-2(b)

Monitoring Location: 1

Description:

Freon Distillation Unit Discharge (Discharge Code 1150080)

Maximum Flow per Batch: 6,500 gallons Maximum Frequency of Discharge: One time only (1) The maximum concentrations specified belov shall not be exceeded at any time.

Maximum Minimum Concentration Frequency Sample Per Esteh of Samoline Tvoe Parameter Code 70015-019 2.0 mg/l Daily (c) Grab Sample Average Freon Grab Sample Average oil & Grease, 70030-019 20.0 mg/l Daily (c)

Total (a) The permittee shall record the total flov (Code 74076-007) and the number of hours of discharge (Code 81381-079) for each day of sample collection.

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(b) The report shall include a detailed explanation of any violations of the limitations specified above.

i (c) Sampling daily required only when discharge occurs.

G. Discharge Serial No. 001A-3

Description:

Outside Tank Area Rainwater Collection Discharge (Discharge Code 108000N)

Flow Intermittent (1) Radiation monitoring is performed in accordance with Paragraph 2 above.

H. Discharge Serial No. 001A-4 Monitoring Location: 1

Description:

Unit No. 1 Radiation Decontamination Solution Tank Discharge (Discharge Code 1060000)

Maximum Flow per Batch 3,500 gallons Maximum Frequency of Discharges Tvo per day Expected Frequency: One per day (1) The maximum concentration specified below shall not be exceeded at any time.

Maximum Maximum Minimum Quantity Concentration Frequency Sample Per Batch Per Batch of Saroline Tvee Parameter Code 574. mg/l Veekly (c) Grab Boric Acid 00698-019 Weekly (c) Grab Boric Acid 00698-056 7.6 kg (a) The permittee shall record the total flov (Code 74076-007) and the number of hours of discharge (Code 61381-079) for each day of sample collection.

(b) The report shall include' a detailed explanation of any violations of the limitations specified above.

(c) Sampling weekly for boric acid Eis required only when -boric t

ecid is being used.

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(d) Radiation . monitoring is. performed in accordance - vith l Paragraph 2 above.

i I. Disch,arge Serial'No. 001A-5 ,

Monitoring Location: 1 Description Unit No. 1 Auxiliary _ Heat Exchanger (Se rvice Vater)

(Discharge Code- 102000d)

Discharge

[ Maximum Daily Flows 43,200,000 gallons per day (1) The temperature of the discharge shall not exceed 90 F.

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Maximum Minimum Instant. Frequency Sample ,

of Sere 11nc Tyne Code limit s ,

Paraneter 00011-015 See Hote (1) above Veekly Instantaneous. !

Temperature F Grab Free Available 50064-019 0.25 mg/l Veckly Chlorine (a) The permittee shall -record the instantaneous flov (Code 00058 078) at the time of grab sample collection.

(b) The report shall include a detailed explanation of any violations of the limitations specified above. ,

J. Discharge Serial No.-001.B Monitoring Locations 1

Description:

Unit No. 2 Discharge (Discharge Code 102000d)

Maximum Daily Flov: 820,g00.000gallonsperday Maximum Temperature: 105 F Average Design Temperature Increase: 24 F (1) The maximum temperature increase at the Unit No. 2 discharge above the intake water temperature shall be 32 F.

(2) The differential temperature increast at the Unit No. 2 discharge above the intake water temperature may be increased to 44 F for a period not exceeding 24 hours2.777778e-4 days 0.00667 hours 3.968254e-5 weeks 9.132e-6 months under conditions of reduced cooling vager flov. In the event the temperature differential exceeds 32 F, the Department of Environmental Protection shall be notified in the monthly monitoring report. ,

(3) The normal operating procedures' include. usually not more than 12 .

times a year, the elevation of the intake - water temperature on each condenser by a thermal ' backwash - process required for the control of sea mussels. The true temperature difference between the receiving stream and discharge water .shall be allowed to exceed the permit limit for brief periods during this treatment schedule.

(4) Free available chlorine shall not be discharged in the condenser cooling - vater for .more than two hours in any one day. Free avellable chlorine. shall not be discharged in the condenser ^

cooling vater of more than one unit at any one time.

(5) The pH of the discharge shall not be less than 6.0 or greater than 9.0 (Code'00400-012).

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13 Maximum Minimum Daily Frequency Sample of Saroline Tyne Code Limits Parameter Daily Composite Aquatic Toxicity, C0019 09A See paragraph 3.J.(6) belov Quarterly Acute Daily Composite Aquatic Tox. city, C0020-09A See paragraph 3.J.(6) belov Quarterly Chronic Hourly Instantaneous Flow 74076 007 -

Hourly (b) Instantaneous pH 00400-012 Temperature ,F 00011-015 Hourly Instantaneous 0.25 mg/l Veekly (c) Grab Free Available 50064-019 Chlorine Grab Free Available 50064-001 737.15 kg/d Veekly (c)

Chlorine (a) Report the following data:

1) Daily range of pH

2) Daily range of flov

3) Daily maximum temperature (,F)

4) Daily minimum temperature

5) Daily average temperature

6) Monthly standard deviation of temperature

7) Daily maximum temperature increase

8) Daily minimum temperature increase

9) Daily average temperature increase

10) Monthly standard deviation of temperature increase ~

31) Monthly maximum heat load (BTU /hr.)

12) Monthly minimum heat load

13) Monthly average heat load

14) Monthly maximum rate of change of heat load

15) Monthly standard deviation of heat load

16) Total flow during chlorination period each sampling day

17) Total daily flov (b) The permittee snall monitor pH manually every four hours whenever the automated pH monitoring equipment malfunctions.

(c) Vhenever Unit No. 2 is operating, veekly monitoring of free available chlorine- shall be performed when chlorination of condenser cooling vater occurs.

(d) The report shall include a detailed explanation of any violations of the limitations specified above.

(6) Ef fective upon issuance and thereaf ter a daily composite sample of the effluent shall not exhibit acute or chronic toxicity inL the receiving waterbody.

(a) Compliance with . this permit condition shall be achieved whens

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14 (i) the Daily Flov of the discharge is greater than or equal to 28,800,000 gallons and there is no significant mortality in a daily composite sample of the effluent at a concentration equal to or greater than an NOAEL =

1002 as determined by the pass / fail methodology in Section 22a-430 3(j)(7)( A) of the Regulations .of Connecticut State Agencies or (ii) the Daily Flov of the . discharge is 'less than 28,800,000 gallons and the LC' 5 value of a daily compositesampleoftaeeffluentpsequaltoorgreater In determining LC V'1" II"'

than an LC50> 652.

concentrations, in duplicak0 e, shall be (5) test utilized and the LC(0value shall' be -determined by the computational methob (Binomial Distribution, Probit Analysis Moving Average Angle, . Spearman-Karber) which yields the smallest 95% confidence .- interval and LC 50' value which is consistent with the dose-response data.

(b) Honitoring to determine compliance with this limit shall be performed Quarterly (January, April, July. October) following the toxicity testing - protocol for . static acute toxicity tests in 'Hethods for Hessuring the Acute Toxicity of Effluents to Freshwater and Marine . organisms' (EPA '

600/4-85/013) with the following specifications:

(i) Hvsidonsis bahia (5 days old or less) and Cverinodon varieratus (30 +/- 5 days old) shall be used as test organisms (ii) Synthetic or natural seavater adjusted to a salinity of 28 ppt shall be used as dilution water in the tests.

(iii) Test duration shall be 48 hours5.555556e-4 days 0.0133 hours 7.936508e-5 weeks 1.8264e-5 months for Hvsidonsis bahia A n 96 hours0.00111 days 0.0267 hours 1.587302e-4 weeks 3.6528e-5 months for cvorinodon varieratus.

(c) Any test in which the survival _of test organisms is less than ninety . (90) percent in' each replicate control. test chamber or: failure to achieve test conditions as specified in Section 22a-430-3 (j ) (7) ( A) of- the . Regulations. o f.

Connecticut State Agencies, such as maintenance of appropriate environmental- controls,- shall . constitute 'an invalid test and vill require immediate retesting. Failure-to' submit valid test results constitutes a permit violation.

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15 (d) Results of the toxicity tests required as partDischarge of this permit condition shall be entered on the Monitoring Report (DMR) for the month in which it was performed, using the appropriate parameter code.

Additionally, complete and accurate test data, including all supporting chemical / physical measurements performed in association with the toxicity tests, as well .as dose / response data shall be entered on the Aquatic Toxicity Monitoring Report form (ATMR). The ATMR shall be sent to the following address:

Aquatic Toxicity Connecticut Department of Environmental Protection Vater Complier.ce Unit 122 Vashington Street Hartford, CT 06106 (e) If any test result indicates that the maximum daily toxicity limit for the effluent has been exceeded, a second sample of the effluent shall be collected and tested-ae described above and the results reported to the Commissioner within 30 days of the receipt of the first set of test results.

(f) If any two consecutive test results or any three test results in a single year indicate that the maximum daily toxicity limit has been exceeded, the permittee shall immediately take all reasonable steps to eliminate toxicity wherever possible-and shall submit a report- for the review-and approval of the Commissioner in accordance with Section 22a-430- 3 (j ) (10) (c ) of the Regulations of Connecticut State Agencies describing proposed steps to. eliminate the toxic impact of the discharge on the recativing waterbody. Such a report shall-include a proposed time schedule to accomplish toxicity reduction.

(7) The discharge shall contain no net increase in ~any of the metal parameters listed belov, except- as allowed in accordance with _ this permit. Sampling shall be conducted concurrently at both the intake and effluent at the frequency stated.

Minimum Frequency _ Sample Code of Saroline Tvoe Parameter 01042-028 Quarterly Daily Co.:posite Total Copper 01051-028 Quarterly -Daily Composite Total Lead Daily Composite Total. Nickel 01067-028 Quarterly-01092-028 Quarterly Daily Composite Total'2inc Daily Composite Ammonia - N 00610-028 -Quarterly 00530-028 _ Quarterly Daily Composite Total Suspended Solids-- Daily Composite Surfactants. Anionic 38260-028- . Quarterly '

70030-028 Quarterly Grab 011 & Grease-Total

- . . _ - - . ~ . - - . - . -

16 K. Discharge Serial No. 001B-1 Honitoring Location: 1 Description Unit No. 2 Blovdovn Tank and Blovdovn Quench Tank Discharge (Including Boric Acid From Steam Generator Treatment)(Discharge Code 101060z)

Maximum Daily Flow: 1.440,000 gallons per day (1) The temperature-of the discharge shall not exceed 220 F.

(2) Prior to the use of diaminoethane the permittee must submit for the review and approval of the Commissioner an engineering report on process modifications.

Maximum Maximum Minimum Daily Instant. Frequency Sample.

Ouantity Limits of Samnlinr. Tvoe Parareter Code 000??-015 See (1) Above Veekly Instantaneous Temperature F 30.0 mg/l Veekly Grab Total Suspended 00530-019 Solids Veekly Grab Total Suspended 00530-056 46.8 kg/d solids Veekly Grab Boric Acid 00698-056 117. kg/d 10.0 mg/l Veekly Grab Ethanolamine C0196-019 Diaminoethane C0195-019 See Note (b) Below (a) The permittee shall record the total flov (Code 74076-007) and the number of hours of discharge (Code 81381-079) for -

each day of sample collection and/or the instantaneous flov (Code 00058-078) at the time of grab sample collection.

(b) Honitoring for diaminoethane shall be performed as approved by the Commissioner in accordance with Paragraph K.(2) above.

(c) . The report shall include. a detailed explanation of any violations of the limitations specified above.

(d) Sampling for boric acid required -only when boric acid treatment of steam generator occurs.

performed accordance with (e) Radiation monitoring is in Paragraph 2 above.

L. Discharge Serial No. 001B-1(a)

Honitoring Location 1 Description Unit No. 2 Steam Generator Secondary Side Vet Layup Drainage Distharge (Discharge Code 117000a)

Maximum Flow per Batch: 70.000 gallons Maximum Frequency of Discharge Two per day Expected Frequency: Six per year pur ""

y -r y- =

c. '

1 17 (1) The temperature of the discharge chall not exceed 150 F.

(2) A minimum of two (2) conde .er circulating pumps shall be in service on Unit 2 during discharge.

(3) No two (2) steam generators may discharge secondary side vet layup drainage at any one time.

(4) Prior to the use of diaminoethane the permittee must submit for the review and approval of the Commissioner an engineering report on process modifications.

(5) The maximum concentrations specified belov shall not be exceeded at any time.

Maximum Maximum Minimum Quantity Concentration Frequency Sample Parameter Code Per Estch Per Batch of Samtline Tyre See (1) Above Daily (c) Instantaneous Temperature F 00011-015 125 mg/l Daily (c) Grab Hydrazine 81313-019 81313-001 33.12 kg/d Daily (c) Grab-Hydrazine Grab Ethanolamine C0196-019 5.0 mg/l Daily (c)

Diaminoethane C0195-019 See Note (b) Belov (a) The permittee shall record' the instantaneous flov (Code 00058-078) at the time of grab sample collection.-

(b) Honitoring for.diaminoethane shall be performed as approved by the Commissioner in accordance with Paragraph L.(4)-

above.

(c) Daily sampling required only when discharging steam generator secondary side vet layup drainage.

I (d) The report shall include a detailed explanation of any l

violations of the limitations specified above.

Radiation monitoring is performed in accordance with l -(e)

Paragraph 2 above.

M. Discharge Serial No. 001B-2 Monitoring-Location: 1 .

Unit - No. 2 Aerated Vaste Radiation Monitor Tank-Descriptions.

Discharge (Discharge Code 117000a)

Maximum Flow per Batch: 5,000 gallons.

Maximum' Frequency of Discharge -Three per day

. Expected Frequency: .Tvo per day (1) The - maximum concentration specified belov' shall not be exceeded at any time.

, _ . ,-, , , w .g -, , -y- q -- ..,..%...q-

18 (2) A minimum of two (2) condenser circulating pumps shall be in service on Unit 2 during discharge except during Unit 2 shutdowns. During Unit 2 shutdovns, the maximum discharge flov shall be 30.5 gallons per minute and a minimum flov equivalent to (2) two service water pumps shall be in service on Unit 2 during discharge.

Maximum Maximum Minimum Quantity Concentration Frequency Sample Per Batch Per Batch 'of Saroline Tvee Parameter Code 45.0 mg/l Veekly Grab Total Suspended 00530-019 Solids Veekly Grab Boric Acid 00698-056 200. kg Veekly Grab pH 00400-012 (a) The permittee shall record the total flov (Code 74076-007) and the number of hours of discharge (Code 81381 079) for each day of sample collection.

(b) The report shall include a detailed explanation of any violations of the limitations specified above.

monitoring ~ is performed in accordance with (c) Radiation Paragraph 2 above.

N. Discharge Serial No. 001B-2(a)

Monitoring Location: 1 Cleaning

Description:

Unit -No. 2_ Steam Generator Chemical Vastevaters Discharge (Discharge Code 101070a)

Maximum Flov per Batch: 107.000 gallons Maximum Frequency of Discharge: One per day Expected Frequency: One per year (1) The maximum concentrations specified belov shall not be exceeded at any time.

(2) A minimum of two (2) condenser circulating pumps shall be in service on . Unit 2 during discharge.

(3) Sixty days prior to performing chemical cleaning of the steam generator the permittee must submit f or the review and - approval l

the Commissioner an engineering report- on process L

of

' modifications.

l

19 Maximum Daily. Minimum Concentration Frequency. Sample of Semeline Tvoe -

~

Parameter Code Per Batch ,

Daily Daily Composite-Biochemical 00310-019 Oxygen Demand) Daily Composite 61017-019 Daily Chemical Oxygen Demand Daily Composite-00610-019 Daily Ammonia - N Daily Composise Copper-Total 01042-019 1.0 mg/l Daily 01045-019 1.0 mg/l Daily Daily Composite Iron-Total Daily Daily Composite Beryllium-Total 01012-019 _

Daily Daily Composite Cadmium-Total 01027-019 0.1 c.g/l 01034-019 1.0 rag /l Daily Daily Composite Chromium-Total Daily Composite Lead-Total 01051-019 0.1 mg/l Daily 1.0 mg/l Daily Daily Composite Nickel-Total 01067-0)? Daily Composite-01092-039 1.0 mg/l Daily 2ine-Total Hourly Range During pH 00400-012 Composite-Daily Daily Composite Total Suspended 00530-019 _

Solids Grab Oil and Grease-T 70030-019 10.0 mg/l Daily (a) The permittee shall record the-total.flov (Code 74076-007) and the - number of hours of _ discharge (Code 81381-079) for each day ,f sample collection.

(b) The ' report shall- include a detailed explanation of any violations of the limitations specified above.

required only when steam generator chemical (c) Sampling cleaning discharge occurs.

O. Discharge Serial No. 001B-2(b)

Monitoring Locations- 1

Description:

Unit No 2 Steam Generator Chemical Decontamination vastevater' Discharge (Discharge Code 101060y)

Maximum Flow per Batch 30,000 gallons Maximum Frequency of Discharge: One-per day Expected Frequency: One per. year (1)_ The pH of thef discharge- shall notL be less than 6.0 or greater than 9.0 (Code 00400-012).

(2) The maximum concentrations specified below shall notlbe exceeded at any time.

(3) _A minimum . of two (2) condenser circulating pumps shall be in

' service on Unit 2 during discharge.

f.

L L

20 Sixty days prior to performing chemical decontamination of' the (4) steam generator the permittee must submit for the 'reviev- and approval of the Commissioner an engineering report on process modifications.

Maximum Dail Minimum Concentrati;. isquency. Sample Code Per Batch of Samoline Tvoe Parameter 00310-019 Daily Daily Co=posite Biochemical Oxygen Demandl .

Chemical Oxygen 81017-019 Daily Daily Composite Demand-77666-019 Daily Daily:Compo,'te Citric Acid Daily ' Daily Compovate Oxalic Acid 77081-03;

. Daily Composite Daily Nitric Acid C0091-019 Daily . Daily Composite Permanganate C0109-019 78151-019 Daily Daily Composite Ethylenediamine Tetraacetic Acid Daily -Daily Composite Hydrogen Peroxide 00139-019 Daily Codposite 77006-019 Daily Formic Acid .

Daily Daily' Composite Copper-Total 01042-019 1.0 ag/l 01045-019 1.0 mg/l Daily . Daily. composite

. Iron-Total . Daily Composite Cadmium-Total 01027-019 0.1 mg/l Daily 01034-019 1.0 mg/l Daily Daily. Composite Chromium-Total Daily Composite Lead-Total 01051-019 0.1 mr/l Daily 01067-019 1.0 mp/1 Daily . Daily Composite Nickel-Total. Daily Daily. Composite Zinc-Total 01092-019 1.0 mg/l Total Suspended 00530-019. 30.0 mg/l' Daily Daily Composite Solids- . Range During'-

00400-019 See'(1) Above Hourly.

pH.

Composite 1 011 and Grease-T: 70030-019 30.0 mg/1 Daily Grabi (a) The permittee shall record the' total flov . (Code:74076 007)-

and the number of hours of- discharge '(Code- 81381-079) for: !

each day of sample collection.

(b) The report shall include a _ detailed explanation of 'any violations of the limitations specified'above.

-(c) -Sampling 1 requiredf 'only when discharging steam generator chemical decontamination vastewater.

(d) .Sa=pling required only for parameters included in the-

. process - approved - by the Commissioner in accordance' with .

j

- Paragraph 0.(4) above.

.l

1

v i

21 P. Discharge Serial No. 001B-3 Monitoring Location: 1

Description:

Unit No. 2 Coolant Vaste Radiation Monitor Tank Discharge (Discharge Code 1170000)

Maximum Flow per Batch 30,000 gallons Maximum Frequency of Discharges Two per day Expected Frequency: One per day (1) The maximum concentration specified below shall not be exceeded at any time.

(2) A minimum of two (2) condenser circulating pumps shall be in s e rvice on Unit 2 during discharge except during Unit. 2 shutdowns. During Unit 2 - shutdovns, the maximum discharge flow shall be 30.5 gallons per minute and a minimum flow eqivalent to (2) two service water pumps shall be in service on Unit 2 during discharge.

Maximum Maximum Minimum Quantity Concentration Frequency Sample-Parameter Code Pot Batch Per Batch of Saeoline Type 22.5 mg/l Veekly Grab Total Suspended 00530-019 Solids Veekly Grab Boric Acid 00698-001700 kg/d (a) The permittee shall record the total flov (Code . 74076-007) and the number of hours of discharge (Code 81381-079) for each day of sample collection.

(b) The report shall include a detailed explanation of any violations of the limitations specified above.

monitoring performed in accordance with (c) Radiation is Paragraph 2. above.

Q. Discharge Serial No. 001B-5 Monitoring Location:' 1 .

+

U

Description:

Unit No. 2 Auxiliary Heat - Exchanger (Service = Vater; Discharge) (Discharge Code 102000d)-

Maximum Daily Flow: 28,800,000 gallons (1) The temperature of the-discharge shall not exceed 95 F.

Maximum Minimum Instant. Frequency Sample Limits of Saerline Tvoe Egrameter Code Temperature F 00011-015 See'(1) Above Veekly Instantaneous 0.25 mg/1 Veekly Grab Free Available 50064-019 c:

Chlorine

2; (a) The perLittee shall record the instantaneous flow (Code 00058-078) at the time of grab sample collection.

(b) The report shall include a detailed explanation of any violations of the limitations specified above.

R. Discharge Serial No. 001B-6 Monitoring Location: 1

Description:

Unit No. 2 Condensate Polisher Regeneration Vastevater Neutralization Tank Discharge ncluding System Floor Drains, Plant Equipment Vashvater, and Boric Acid from Steam Generator Treatment (Discharge Code 1060000)

Maximum Flow per Batch: 25,000 gallons Maxieum Frequency of Discharge Three per day Expected Frequency: Two per day (1) Prior to the use of diaminoethane the permittee must submit fcr the review and approval of the Coccissioner an engineering report on process modifications.

(2) A minimum of two (2) condenser circulating pumps shall be .c service on Unit 2 during discharge.

(3) The maximu= concentrations specified belov shall not be exceeded at any time.

Maximum Maximum Minimum Quantity Concentration Frequency Sample Parameter Code Per Batch 3 4r Batch of Samoline Type __

45.0 mg/l Veekly Grab Total Suspended 00530-019 Solids Grab 00400-012 Veekly pH 20.0 mg/l Monthly Grab Oil and Grease-T 70030-019 Veekly (c) Grab Boric Acid 00698-056 32.0 kg C0196-056 230 kg Veekly Grab Ethanolamine Diaminoethane C0195-056 See (d) Belov (a) The permittee shall record the total flov (Code 74076-007) and the number of hours of discharge (Code 81381-079) for each day of sample collection.

(b) The report shall . include a detailed explanation of any violations of the limitations specified above.

(c) Sampling weekly for boric acid required only when boric acid treatment of steam generator occurs.

(d) Monitoring for diaminoethan" chall be performed as approved by the Commissioner in accordance with Paragraph R.(1).

above.

23 monitoring is performed in accordance with (e) Radiation Paragraph 2 above.

S. Discharge Serial No. 001B-7 Monitoring Location: 1

Description:

Unit No. 2 Condensate Polisher Auxiliary Heat Exchanger (Service Vater) Discharge (Discharge Code 102000c)

Maximum Daily Flow: 5.760,000 gallons per day (1) The temperature of the discharge shall not exceed 85 F.

Maximum Minimum Instant. Frequency Sample Limits of Saroline Tvre Parseeter Code 0.25 mg/l Veekly Grab Free Available 50064-019 Chlorine Weekly Instantaneous Temperature F 00011-015 See (1) Above (a) The permittee shall record the instantaneous flov (Code 00058-078) at the time of grab sample collection.

(b) The report shall include a detailed explanation of any violations of the limitations specified above.

T. Discharge Serial No. 001B-8 Monitoring Location: 1

Description:

Unit No. 2 Condenser Hotvell Discharge _

(Discharge Code 117000a)

Maximum Flow per Batch: 100,000 gallons Maximum Frequency of Discharge: One per day Expected Frequency: Five per year (1) The temperature of the discharge shall not exceed 112 F.

(2) A minimum of two (2) condenser circulating pumps shall be in service on Unit 2 during discharge.

(3) Prior to the use of diaminoethane the permittee must submit for the review and and approval of the Commissioner an engineering report on process modifications.

(4) The maximum concentrations specified belov shall not be exceeded at any time.

4

s .

24 Maximum Minimum Concentration Frequency Sample Per Batch of Saroline Tvoe Parameter Code SEE NOTE (1) ABOVE Daily (c) Grab Temperature F 00011-015 Daily (c) Instantaneous pH 00400-012 45.0 mg/l Daily'(c) Grab Total Suspended 00530-019 solids Grab 5.0 mg/l Daily (c)

Total Iron 01045-019 Grab Hydraaine 81313-019 50.0 mg/l Daily (c) 3.0 mg/l Daily (c) Grab Ethanolamine C0196-019 Dia=enoethane C0195-019 See Note (d) Belov (a) The permittee shall record the total flow (Code 74076-007) and the number of hours of discharge (Code 81381-079) for each day of_ sample collection.

(b) The report shall include a detailed explanation of any violations of the limitations specified above.

(c) Sampling required only when the condenser hotwell discharge-occurs.

(d) Monitoring for diaminoethane shall be performed as-approved by the Commissioner in accordance with Faragraph T.(3).

above.

U. Discharge Serial No. 001B-9 Monitoring Location: 1

Description:

Unit No. 2 Non-contaminated Closed Cooling Vater System Drainage Discharge (Discharge Code 102000b) -

Maximum Daily Flows 30,000. gallons per day (1) The temperature of the discharge shall not exceed 100 F.

(2) The maximum limits specified below shall not be exceeded at-any time.

(3) A minimum of two - (2) condenser circulating pumps 1 shall be - in :

se rvice on Unit 2 during discharge except -during Unit 2 shutdovas. During; Unit 2 shutdovns, the _ maximum discharge flow shall be 8.5 gallons per _ minute 'and a minimum flow eqivalent to (2) two service water pumps shall. be in service on Unit 2 during discharge.

Maximum Minimum Instant. Frequency Sample Limits of Samoline' Tvoe Parameter Code U See (1) Above Daily Instantaneous Temperature F 00011-015 75.0 mg/l Daily Grab Hydrazine 81313-019'

- m r , + - . - .

25 (a) The permittee shall record the total flow (Code 74076-007) and the number of hours of discharge (Code 81381-079) for each day of sample collection and/or the instantaneous flov (Code 00058-078) at the time of grab sample collection.

(b) The report shall' include a detailed explanation of any violations of the limitations specified above.

(c) Sampling required only when discharging closed cooling water system drainage.

V. Discharge Serial No. 001-C Monitoring Location: 1

Description:

Unit No. 3 Discharge (Discharge Code 102000d)

Maximum Daily Flow: 1.3g3,200,000 gallons per day Maximum Temperature: 98 F Average Design Temperature Increase: 18 F

( ) The maximum temperature increase at the Unit No. 3 discharge above the intake water temperature shall be -24 F.

(2) The differential temperature increase at the Unit No. 3 discharge above the intake water temperature may be increased to 30 F for a period not exceeding 24 hours2.777778e-4 days 0.00667 hours 3.968254e-5 weeks 9.132e-6 months under conditions of reduced cooling vrter flow. In the event the temperature differential exceeds 24 F, the Department of Environmental Protection shall-be notified in the monthly monitoring report.

(3) The normal operating procedures include, usually not more than 12 times a year, the elevation of the intake water temperature on each condenser by a thermal backvash process required for the control of sea mussels. The true temperature dif ference between the receiving stream and discharge water shall be allowed to exceed the permit limit for brief periods during this treatment schedule.

(4) Free available chlorine shall not be discharged in the condenser cooling water for more than two hours in any one day. Free available chlorine shall not be discharged in the condenser cooling water of more than one unit at any one time.

(5) The pH of the discharge shall swt be less than 6.0 or greater than 9.0 (Code 00400-012).

I

. _ _ ._. _ . __ _ _-- _ .- _ m _ . .

.e ,,

s" . :

t 6

26 Maximum Minimum Instant. Frequency Sample Limits of Saeoline Tvoe Paremeter Code See paragraph Quarterly. Daily Composite-Aquatic Toxicity, C0019-09A Acute 3.V.(6) belov See paragraph Quarterly Daily Composite Aquatic Toxicity. C0020-09A Chronic 3.V.(6) belov 74076-007 Hourly- Instantaneous Flov Hourly (b) Instantaneous.

pH 00400-012 00011-015 Hourly Instantaneous; Temperature F Free t.vailable 50064-019 0.25 mg/l Veekly (c) Grab Chlorine Grab Free Available 50064-001- 1386. kg/d Veekly (c)

Chlorine (a) Report the following data:

1) Daily range of pH

2) Daily range of flov

3) Daily maximum temperature (gF)-

4) Daily minimum temperature-

5) Daily average temperature

6) Monthly standard. deviation of_ temperature

7) Daily maximum temperature increase B) Daily minimum temperature increase

9) Daily average temperature increase 10)' Monthly standard deviation of temperature increase

.11) Monthly maximum heat load (BTU /hr.)

12) Monthly minimum' heat load

13) Monthly average heat load 14)- : Monthly maximum rate-of change of heat load 15)- Monthly standard deviation of heat load

16) Total flow during chlorination- period each sampling day :-

17) Total daily flov-(b). The ' permittee shall monitor pH : manually _ every ; four hours whenever the automated pH monitoring equipment malfunctions.

(c)- Whenever' Unit 3 is operating weekly--_ monitoring of free available chlorine shall be performed when chlorination of condenser cooling water occurs.

-(d) The report shall include . a detailed . explanation' of . any violations of the. limitations specified above.

" (6) Effective upon issuance and thereafter a daily ' composite sample -

of the effluent shall not: exhibit acute or ' chronic toxicity qin

~

'the receiving vaterbody.

(a) Compliance with this permit condition shall be achieved-

-when:

p , , .,- ,- , - - ~ - - ,,-1

27 (1) the Daily Flov of the discharge is greater than or equal to 43,200,000 gallons and there is no significant mortality in a daily composite sample of the' effluent at a concentration equal to or greater than an NOAEL =

1002 as determined by the pass / fail methodology in Section 22a-43 0-3 (j ) (7 ) ( A) of ths Regulations of Connecticut State Agencies .or (ii) the Daily Flov of the discharge is less than 43,200,000 gallons and the LC value of a daily composite 0

sample of the effluent is equal to or greater than' an 672. In detemining M 50 value, ive (5)

LC50>

test concentrations, in' duplicate, shall be utilized and the LC value shall be determined. by the 50 computational method (Binomial Distribution.. Probit Analysis, Moving Average . Angle, Spearman-Karber) which yields the smallest 952 confidence interval and LC50 value which is consistent with the dose-response data.

(b) Monitoring to determine compliance with this limit shall be performed Quarterly (January, April, July, October)-

following the toxicity testing protocol for static acute toxicity tests in ' Methods for Measuring the Acute Toxicity of Effluents to Freshvater and -Marine Organisms" (EPA 600/4-85/013) with the following specifications:

(1) Mvsidoosis battia (5 days . old or = less) and Cvorinodon -

variecatus (30 +/- 5 days old) shall be used as. test organisms (ii) Synthetic or natural seavater adjusted to a salinity of--

28-32 ppt shall be used as dilution water in..the tests.

(iii) Test duration shall be 48 -hours for Mvsidoosis bahia and 96 hours0.00111 days 0.0267 hours 1.587302e-4 weeks 3.6528e-5 months for.Cvorinodon varieratus.

(c) Any test in which the survival . of test organisms - is- less than ninety (90) percent - in each replicate ' control test-chamber or failure to achieve test conditions as specified 22a-430-3 (j ) (7) ( A) the- Regulations of-in Section of Connecticut State Agencies, such as maintenance of appropriate environmental controls, dall constituta an invalid test and will require.immediate rstesting. Faiare to submit valid test results constitutes a permit violation.

s

28 (d) Results of the toxicity tests required as. partDischarge of this permit condition shall be entered on the Monitoring Report (DMR) for the month in which -it was performed, using the appropriate parameter . code.

Additionally, complete and accurate test data, including-all supporting chemical / physical measurements performed in association with the toxicity tests, as well as.

dose / response data shall be entered on the-Aquatic Toxicity Honitoring Report form (ATMR). The ATHR shall be sent to the following address:

Aquatic Toxicity Connecticut Department of Environmental Protection Vater Compliance Unit 122 Vashington Street Hartford, CT 06106 (e) If any test result indicates that the maximum daily toxicity.

limit for the effluent has been exceeded, a second sample of_

the effluent shall be collected and' tested as described above and the results reported to the Commissioner within 30 days of the receipt of the first set of test results.

(f) If any two consecutive test results' or any three test results in a' single year indicate that the maximum' daily toxicity limit has been exceeded, the permittee shall im=ediately take all reasonable steps to eliminate- toxicity

~

- wherever possible and shall submit a report for the-review and approval of the Commissioner in accordance with Section 22a-430 3(j )(10)(c) of the Regulations of' Connecticut State Agencies -describing . proposed steps. to eliminate the toxic impact of the discharge on the receiving waterbody. Such a report shall include a propos,ed time schedule'to accomplish toxicity reduction.

(7) The discharge shall contain no net increase- in any of 'the metal parameters listed below, except as allowed in accordance with this permit. Sampling shall be conducted concurrently at both the intake-and effluent at the frequency stated.

Minimum Frequency Sample Code of Samoline Tvoe Parameter Total copper 01042-028 Quarterly Daily Composite 01051-028 Quarterly Daily. Composite Total Lead Daily Composite Total Nickel 01067-028 Quarterly Total Zinc 01092-028 Quarterly Daily Composite Ammonia - N 00610-028 Quarterly Daily Composite Total Suspended Solids 00530-028 Quarterly Daily Composite Surfactants-Anionic 38260-028 Quarterly ' Daily composite Oil & Grease- T 70030-028 Quarterly Grab

.- a 29 V. Discharge Serial No. 001C-1 Monitoring Location: 1

Description:

Unit No. 3 Steam Generator blovdown Discharge (Discharge Code 1010602)

Maximum Daily Flow: 1,400,000 gallons per day (1) The temperature of the discharge shall not exceed 220 F.

(2) Prior to the use of ethanolamine and diaminoethane the permittee must submit for the review and approval of the Com=issioner an engineering report on process modifications.

Maximum Minimum Instant. Frequency Sample of Saroline -Tyne Paraceter Code Limits See (1) Above- Veekly Grab Temperature F 00011-015 60.0 mg/l' Veekly Grab Total Suspended 00530-019 Solids Veekly. Grab pH 00400-012 00698-056 Veekly- Grab Boric Acid Ethanolamine C0196-019 See (d) Belov Diaminoethane C0195-019 See (d) Belov (a) The permittee shall record the instantanecas flov -(Code 00058-078) at the time of grab sample collection.

(b) The report . shall . include a detailed . explanation Lof any viciations of the limitations specified above.

(c) Monitoring weekly for boric acid required only when boric acid treatment-of steam generator occurs.

Monitoring for ethanolamine and dia=inoethane shall be-

-(d) performed,as approved by the Commissioner in accordance with1 Paragraph V.(2)'above.

Radiation monitoring is performed in accordance- vith (e) . Paragraph 2..above.

X. Discharge Serial No. 001C-1(a)

Monitoring Location: 1 . .

' Unit No. 3 ' Steam Generator Secondary Side Wet .Layup

Description:

Drainage Discharge- (Discharge Code 117000a)

Maximum Flow per Batch: 144,000' gallons

-Maximum Frequency of Discharge Two per day.

Expected Frequenet: Twelve per year (1) A minimum of two (2) condenser circulating pumps shall be in service on Unit 3 during discharge.

.- e ,

30 (2) Prior to the use of ethanolamine or diamenoethane the permittee shall submit for the review and approval of the Commissioner an engineering report on process modifications.

(3) The maximum concentrations.specified below shall not be exceeded at any time.

Maximum Minimum Concentration Frequency Sample Per Batch of Saroline Tvoe -

Parameter Code 125.0 mg/l Daily (c) Grab Hydramine 81313 019 Ethanolamine C0196-019 See (d) Belov Diaminoethane C0195-019 See (d) Below (a) The permittee shall record the total flov (Code 74076-007)-

and the number of hours of discharge (Code-81381 079) for each day of sample collection and/or the instantaneous flov (Code 00058-078) at the time of grab sample collection.

(b) The report shall include a detailed explanation of any violations of the limitations specified above.

(c) Sampling required only when discharging steam generator

-secondary side vet-layup drainage.

(d) Monitoring for ethanolamine and diamineethane shall be performed as approved by the Commissioner in accordance with Paragraph X.(2), above.

performed in accordance with (e) Radiation monitoring is

Paragraph 2 above.

Y. Discharge Serial No. 001C-2 Monitoring Location: 1 Test -Tank Discharge l

Description:

Unit No. 3 Radiation Vaste i

(Discharge Code 153000n) l Maximum Daily per. Batch: 25,000 gallons l Two per. day Maximum Frequency of Discharge:

l Expected Frequency: Two per day (1) A -minimum' of - two (2) condenser circulating pumps shall ~ be in se rvice on. Unit 3 during discharge except ~during Unit 3 shutdowns. During Unit 3 shutdowns, the maximum discharge flow-shall be 15.0 gallons per-minute and a' minimum flov eqivalent to two (2) service water pumps shall be in service on Unit 3 during discharge.

f 31 Maximum -Maximum Minimum Quantity Concentration Frequency Sample Per Batch Per Batch of Samoline Tvoe Parameter Code 00698-056 952.4 kg Weekly Grab Boric Acid Grab Lithium-Total 01132-019 Veekly.

00095-011 Veekly Grab Specific Conductivity 00400-012 Veekly Grab pH (a) The permittee shall record the total flov (Code 74076-007) and the number of hours of discharge (Code 81381-079) for each day of sample collection.

(b) The -report shall include a detailed explanation of any violations of the limitations specified above.

(c) Radiation monitoring is performed in accordance with Paragraph 2. above.

2. Discharge Serial No. 001C-3 Monitoring Location: 1

Description:

Lov Level Radiation Vaste Drain Tank Discharge (Discharge Code 117000a)

Maximum Flov per Batch: 5,-000 gallons Maximum Frequency of Discharges Four per day Expected Frequency: Four per day (1) The maximum concentration specified belov shall not be exceeded at any time.

(2) A minimum - of -- two (2) condenser circulating pumps shall be J in service on Unit 3 -during discharge if .at any time the- boric acid evaporator units are not - functional -and the boric acid concentration exceeds 30 mg/1.

Maximum Maximum Minimum

. Quantity . Concentration' Frequency Sample l

Code Per Batch Per Batch of Samoline 'Tvoe Earameter 00698-056 250. kg Weekly- Grab Boric Acid Grab Total Suspended 00530-019 45.0 mg/l Veekly i

Solids 00400-012 Veckly Grab pH

.(a) The permittee shall record the total flov (Code 74076-007);

and the ' number of hours of discharge (Code B1381-079) for each day of sample collection.

(b) The report shall include. a detailed explanation of_ any violations of the limitations specified above.

.6 8 32 (c) Radiation monitoring is performed in accordance with Paragraph 2. above.

AA. Discharge Serial No. 001C 4 Monitoring-Location: 1

Description:

Unit No. 3 Makeup Demineralizer Backvash Discharge Including Feedvater System Vet Layup Drainage and Auxiliary Boiler Stack Drainage (Discharge Code 1060000)

Maximum Flow per Batch: 80,000 gallons Maximum Frequency of Discharge: One per day Expected Frequency: One per day (1) The maximum concentrations specified below shall not be exceeded at_any time.

Maximum Minimum Concentraticn Frequency Sample Per Batch of Secoline Tvoe Parameter Code 45.0 mg/l Veekly Grab Total Suspended 00530-019 Solids Grab Hydrazine 81313-019 75.0 mg/l Veekly (c)

- Veekly Grab pH 00400-012 (a) The permittee shall record the total flov (Code 74076-007) and the number of honts of discharge (Code 81381-079)_ for each day of sample collection.

(b) The report shall include a detailed ' explanation of any violations of the limitations specified above.

(c) Sampling _ veekly for hydrazine required only when draining-the feedvater system vet layup or_ the auxiliary boiler . stack system.

BB. Discharge Serial No. 001C-5 Monitoring Location 1

Description:

Unit No. 3 Auxiliary Heat Exchanger (Service Water)

Discharge (Discharge Code 102000d)

Maximum Daily Flow: 43,200,000 gallons per day (1) The temperature of the discharge-shall not exceed 100 F.

Maximum Minimum Instant. Frequency. Sample Code Limits of Samoline Tvoe Parameter Temperature "F 00011-015 See (1) Above Veekly- Instantaneous 50064-019 0.25 mg/l Veekly Grab Free Available Chlorine (a)_ The permittee shall record the instantaneous flov (Code 00058-078) at the time-of grab sample collection, i

' 33 (b) The report shall include a detailed explanation - of any violations of the limitations specified above.

CC. Discharge Serial No. 001C-6 Monitoring Location: 1 Description Unit No. 3 Condensate Folisher Regeneration Vastewater Neutralization Tank Discharge Including Plant Equipment Vashvaters And Unit No. 3 Hot Water Heating System Drainage (Discharge Code 1060000)

Maximum Flow per Batcht 25,000 gallons Maximum Frequency of Discharges Two per day Expected Frequency: Two per day (1) The temperature of the discharge shall not exceed 100 F.

(2) The pH of the discharge shall not be less than 6.0 or greater-than 9.0.-(Code 00400-012)

(3) Prior to the use of ethanolamine and diaminoethane the permittee must submit for the review and and approvalaof the Commissioner an engineering report on process modifications.

(4) The maximum concentrations specified below shall not be exceeded at any time.

Maximum Maximum Minimum Quantity Concentration Frequency . Sample Per Day Per Batch of Saeoline Tvoe Parameter Code 00011-015 See (1) Above Veekly _ Grab' Temperature F Hourly Grab pH 00400-019 See (2) Above 00530-019 45.0 mg/1. Veekly. Grab Total Suspended Solids veekly Grab Total Suspended 00530-056 4.24 kg Solids 011 and Grease-T 70030-056 188. kg. Monthly Grab 20.0 mg/l Monthly Grab

'011.and Grease-T 70030-019' Daily-(c)' Grab Hydrazine -81313-019 75.0 mg/l Ethanolamine C0196-056 See (d) Belov Diauinoethane C0195-056 See (d) Belov-(a) The permittee shall record the total flov (Code 74076-007) and the number of hours of discharge (Code 81381-079)- for each day of sample collection and/or the instantaneous.flov (Code 00058-078) at the time of grab sample collection.

(b) The report shall include a detailed explanation of any violations of the limitations specified above.

(c) Sampling daily for-boric acid and hydrazine is required only when Unit No. 3 Hot Vater Heating System .is being discharged.

v ..

.' en 34 (d) Monitoring for ethanolamine and diaminoethane shall be performed as approved by the Commissioner in accordance with Paragraph CC.(3) above.

(e) Radiation monitoring is performed in accordance with Paragraph 2 above.

DD. Discharge Serial No. 001C-6(a)

Monitoring Location: 1

Description:

Unit No. 3 Steam Generator Chemical Decontamination Vastevater (Discharge Code 1060000)

Maximum Flow per Batch 40,000 gallons Maximum Frequency of Discharge: One per day Expected Frequency: One per year (1) The pH of the discharge shall not be less than 6.0 or greater than 9.0. 'Jode 00400-012)

(2) The maximum concentrations specified belov shall not be exceeded at any time.

(3) Sixty days prior to performing chemical decontamination of the steam generator the permittee must submit for the review and approval of the Commissioner an engineering report on process modifications.

Maximum Minimum Concentration Frequency Sample Per Batch of Saenline Tvee Parameter Code -

Daily Daily Composite Biochemical 00310-019 Oxygen Demandi Daily Daily Composite Chemical Oxygen B1017-019 Demand Daily Composite Daily Citric Acid 77666-019 Daily Daily Composite Oxalic Acid 77081-019 Daily Composite 4 C0091-019 Daily Nitric Acid Daily Daily Composite Permanganate C0109-019 78151-019 Daily Daily Composite Ethylenediamine Tetraacetic Acid Daily Daily Composite Hydrogen Peroxide 00139-019 Daily Composite 77006-019 Daily Formic Acid Daily Daily _ Composite 01042-019 1.0 mg/l Copper-Total Daily Daily Composite 01045-019 1.0 mg/l Iron-Total Daily Composite Cadmium-Total 01027-019 0.1 mg/l Daily 01034-019- 1.0 mg/l Daily Daily Composite Chromium-Total Daily Composite Lead-Total 01051-019 0.1 mg/l Daily 01067-019 1.0 mg/l Daily Daily Composite Nickel-Total

1.0 mg/l Daily Daily Composite Zine-Total 01092-019 00530-019 30.0 mg/l Daily Daily Composite Total Suspended Solids Range During 00400-019 SEE NOTE (1) ABOVE Hourly pH Composite ,

30.0 mg/l Daily Grab (

011 and Grease-T 70030-019

g_

.. ' e.

1 35 (a) The permittee shall record the total flov (Code 74076-007) and the number of hours of discharge (Code 81381-079) for-each day of sample _ collection and/or'the instantaneous flow (Code 00058-078) at the time of grab sample collection.

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(b) The report shall include a' detailed explanation of any violations of the limitations specified above.

(c) Sampling required only when discharging - steam generator chemical decontamination vastevater. Sampling required only-for parameters included in the process approved by the Commissioner'in accordance with Paragraph DD.(3) above.

EE. Discharge Serial No. 001C-6(b)

Monitoring Location: 1

Description:

Unit - No. 3 Auxiliary Boiler Blovdovn Sump Discharge

-(Discharge Code 117000a)

Maximum Daily Flow 72,000 gallons (1) The temperature of the discharge shall not exceed 210 F..

(2) The_ maximum concentration specified below shall not be-exceeded at any time.

Maximum Minimum Instant. Frequency Sample of Sarolinc 'Tyne Code Limits Parameter Veekly (c) Grab Temperature F 00011-015 See (1)-Above.

75.0 mg/l Veekly (c) Grab Hydrazine 81313-019

-(a) The permittee shall record . the total. flow (Code 74076-007) and the number of hours of discharge' (Code 81381-079)-. for each day of sample collection.

(b) The report 'shall ' include a detailed explanation ' of ' any '

violations of the limitations specified above.

(c) . Sampling veekly' is required only when the auxiliary-boiler is in operation.

1

.FF. -Discharge Serial No. 001C-8 Monitoring Location: 1 L

Description:

Unit- . N o ,' 3 Condenser Hotvell. Discharge (Discharge Code 1170000)

Maximum Flow per Batch: 100,000 gallons Maximhm Frequency of Discharges. One per day Expected-Frequency: Fiie per year (1). The temperature of the discharge shall not exceed 112 F.

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36 i

(2) Prior to the use of ethanolamine and diaminoethane the permittee.

must submit for the review and approval of the Commissioner a'n engineering report on process modifications.

(3) The maximum concentrations specified below shall not be exceeded at any time.

Maximum Minimum Concentration Frequency Sample.

Code Per Batch of Samoline Tvoe -

Parseeter See (1) Above Daily'(c) Grab Temperature F 00011-015 00400-012 Daily (c) Instantaneous pH Grab Total Suspended 00530-019 45.0 mg/l Daily (c)-

Solids Grab Total Iron 01045-019 5.0 mg/l Daily (c) 50.0 mg/l Daily (c) Grab Hydrazine 81313-019 Ethanolamine C0196-019 See (d) Belov Diaminoethane C0195-019 See (d) Below (a) The permittee shall record.the total flov (Code 74076-007) and the number of hours of discharge (Code 81381-079) for each daf of sample collection.

(b) The report shall include a detailed explanation of any violations of the limitations specified above.

(c) Sampling daily is - required only when condenser hotvell discharge occurs.

(d) Honitoring for ethanolamine~ and diaminoethane shall be perf ormed as approved by the Commissioner' in accordance with Paragraph FF.(2) above.

GG. Discharge Serial No. 001C-9 Monitoring Location: 1

Description:

. Unit No. 3 Non-contaminated Closed Cooling Vater System Drainage Discharge (Discharge Code 102000b)

Maximum Daily Flows 30,000 gallons per day (1) The temperature of the discharge shall not exceed 100 F.

f (2) The maximum concentration specified belov shall not be exceed .d -

at any time.

(3) A minimum of two (2) varrfenser circulating pumps shall be in-service on Unit '. ,

ng discharge except during Unit 3 shutdovns. During Unit 3 shutdovns, the maximum discharge flow l

shall be 10.0 gallons por minuteL and a minimum flow eqivalent to two (2) service water pumps shall-be in service on Unit 3 during I . discharge.

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EE 37 Maximum Minimum Instant. Frequency Sample Code Limits of Saeoline Type Parameter Daily (c) Grab Temperature F 00011-015 See (1) Above 75.0 mg/l Daily (c) Grab Hydrazine 81313 019 (a) The permittee shall record the instantaneous flov (Code 00058-078) at the time of grab sample collection.

(b) The report shall include a detailed - explanation of any violations of the limitations specified above.

(c) Sampling daily for temperature and hydrazine required only when discharging closed cooling water system drainage.

HH, Discharge Serial No. 000

Description:

Unit No. 1 Screen Washvater Discharge (Discharge Code 106000n)

Pave ving Stream - Niantic Bay (Basin Code 2000) 4 PresenL/ruture Veter Quality Standard - SA/SA Haximum Daily Flow 2,016,000 gallons II. Discharge Serial No. 003 Description - Unit No. 2 Screen Washwater Discharge (Code 106000n)

Receiving Stream - Niantic Bay (Basin Code 2000)

Present/ Future Vater Quality Standard SA/SA Maximum Daily Flow - 2,540,000 gallons JJ. Discharge Serial No. 004 Description - Unit No. 3 Screen Vashwater Discharge (Code-106000n)

Receiving Stream - Niantic Bay (Basin Code 2000)

Present/ Future Vater Quality Standard - SA/SA Maximum Daily Flov - 5,760,000 gallons KK. Discharge Serial No.-005-1 Monitoring. Location: 1

Description:

Unit ' No. 1 Non-contaminated Floor Dra' ins. Transformer Yard Drains, Water Vashes, Clean ' Vater Drains, and Surface Water Runoff (Discharge Code 1080000)

Receiving Stream: Long Island Sound via Quarry Cut (Basin Code 2000)

Present/ Future Vater Quality Standard SA/SA Flow: Intermittent (1) The' maximum concentrations-specified belov shall not be exceeded at any time.

Maximum Minimum Instant. Frequency Sample Limits of Samoline Tvoe Parameter Code-20.0 mg/l Monthly (c) Grab

-011 and Grease-T 70030-019 Monthly Grab'

-Total Suspended 00530-019 30.0 mg/l Solids

I l

38 (a) The permittee shall record the instantaneous flov (Code 00058-078) at the time of grab sample collection.

(b) The report shall include a detailed explanation of any violations of the limitations specified above.

(c) Monitoring monthly required when oil separator discharge occurs.

LL. Discharge Serial No. 006-1 Monitoring Location: 1

Description:

Unit No. 2 and Unit No. 3 Non-contaminated Floor Drains Including Boric Acid From Steam Generator Treatment, R. O. Treatment of Makeup Continuous Blovdown From Vater, Unit No. 2 and Unit No. 3 Diesel Generator Cooling Vater Drainage, Vater Softener Regeneration Drainage, Unit No. 3 Control Building Cooling System Drainage, Vater Washes, Clean Vater Drains, and Surface Vater Runoff (Discharge Code 1010602)

Receiving Stream Niantic Bay (Basin Code 2000)

Present/ Future Vater Quality Standard: SA/SA Maximum Daily Flow 432,000 gallons (Excluding Surface Vater Runoff)

(1) The maximum limits specified below shall not be exceeded at any time.

(2) The pH of the discharge shall not be less than 6.0 or greater than 9.0 (Code 00400-012).

Average Maximum Minimum Frequency Sample Monthly Instant.

Limits of Samnline Tvee Parameter Code Limits '

t See paragraph Quarterly Daily Composite Aquatic Toxicity. C0019-09A Acute 3.LL.(3) below Daily Composite Aquatic Toxicity, C0020-09A See paragraph Quarterly Chronic 3.LL.(4) below Boric Acid 00698-001 See (f) belov Veekly (d) Daily Composite 10.0 mg/l 20.0 mg/l Monthly (c) Grab Sample Oil and Grease-T 70030-019 Average 00530-019 20.0 mg/l 30.0 mg/l Veekly (e) Daily Composite Total Suspended Solids keekly (e) Range during pH 00400-012 See (2) Above Composite 01042-001 .0474 kg/d See (f) belov Veckly Daily Composite Copper-Total Daily Composite Lead-Total 01051-001.2273 kg/d See (f) below Veekly 01067 001.2207 kg/d See (f) belov Veekly Daily Composite Nickel-Total Daily Composite Zine-Total 01092-019 .401 kg/d See (f) below Veekly 50060-019 .12 mg/l .24 mg/l Veekly Grab Sample Total Residual Average Chlorine Daily Composite Ammonia-N 00610 019 Quarterly 3B260-019 Quarterly Daily Composite Surfactants !

Anionic

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39 (a) The permittee shall record the instantaneous flov (Code 00058-078) at the time of grab sample collection.

(b) The report shall include a detailed explanation- of any=

violations of the limitations specified above.

(c) Monitoring monthly for oil and grease required when oil separator discharge occurs.

(d) Monitoring veekly for boric acid required only when boric acid treatment of steam generator occurs.

(e) Monitoring weekly for total suspended solids and pH shall only include dry weather flows.

(f) The following maximum daily limits shall apply for boric acid, total copper, total lead, total nickel and-total zinc.

re spectively: Boric Acid-4.1 kg/d, Cu .0948 kg/d, Pb .2546 kg/d, Ni .4414 kg/d, 2n .802 kg/d.

(3) Effective upon issuance and thereafter a daily composite sample of the effluent shall not exhibit acute toxicity in the receiving waterbody.

(a) Dilution equivalent to 342,000. gallons per hour (gph) is allocated to a zone of influence for assimilation of toxicity.- This allocation shall be used = to calculate - the instream vaste concentration (IVC) according_to the formular maximum daily flov x 100 IVC =

(maximum daily flov + allocated zone of influence _ flov) _

(b) In lieu of maximum daily flov,. the mean effluentL flow rate for the previous 30 operating days may be used _to calculate the instream vaste concentration provided the permittee maintains an accurate record of the total flow and number of hours. of discharge for each operating' day and .provided that.

the flow rate for any one operating day used in calculating the mean does not exceed the mean flow by. more than-twenty-five percent (252).

I (c) Compliance with this permit condition shall be achieved when the LC ID value for the effluent is greater than- three ' (3) times tne IVC.

(d) Monitoring to-determine compliance with this limit'shall be performed Quarterly (J anuary , April, July,. October).

following the _ toxicity ~ testing protocol for static - acute.

toxicity tests in " Methods for Measuring the Acute Toxicity of Effluents to Freshwater and Marine Organisms" (EPA 600/4-85/013) vith the following specifications:

(i) HyJ.idopsis b@in (5 ' days old or less) shall be-used as test t organisms.

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k 40 (ii) Synthetic or natural seavater adjusted to a salinity of 28-32 ppt shall be used as dilution water in the tests.

(iii) Test duration shall be 48 hours5.555556e-4 days 0.0133 hours 7.936508e-5 weeks 1.8264e-5 months for Mvsidensis bahia.

(4) Effective upon issuance and thereafter a daily composite sample of the effluent shall not exhibit chronic toxicity in the receiving vaterbody.

(a) Dilution equivalent to 342,000 gallons per hour (gph) is allocated to a zone of influence for assimilation of toxicity. This allocation shall be used to calculate the instream vaste concentration (IVC) according to the formula:

rarimum daily flov x 100 IVC =

(maximum daily flow + allocated zone of influence flov)

(b) In lieu of maximum daily flow, the mean effluent flow rate for the previous 30 operating days may be used to calculate the instream vaste concentration provided the permittee maintains an accurate record of the total flov and number of hours of discharge for each operating day and provided that the flow rate for any one operating day used in calculating the mean does not exceed the mean flov by more then twenty-five percent (252).

(c) Compliance with this permit condition shall be achieved when the LC 50 value fr the effluent is greater than twenty (20) times the IVC.

(d) Monitoring to determine compliance with this limit shall be performed Quarterly (January, April, July, October) following the toxicity testing protocol for static acute toxicity tests in ' Methods for Measuring the Acute Toxicity of Effluents to Freshwater and Marine Organisms" (EPA 600/4-85/013) with the following specifications:

(i) Mvsidopsis bahia (5 days old or less) shall be used as test organisms.

(ii) Synthetic or natural seavater adjusted to a salinity of 28-32 ppt shall be used as dilution vater in the tests.

shia.

(iii) Test duration shall be 48 hours5.555556e-4 days 0.0133 hours 7.936508e-5 weeks 1.8264e-5 months for Mvsidoosis (5) (a) In determining LC values, five (5) test concentrations.

induplicate,shalg0be utilized.

(b) The LC va e shall be de terdned by de computational method 5 (Einomial Distribution, Probit Analysis. Moving Average Angle, Spearman-Karber) which yields the smallest q 952 confidence interval and LC 0 value which is consistent 1

with the dose-response data.

i ..

41 (c) Any test in which the survival of test organisms is less than ninety (90) percent in each replicate control test chamber or failure to achieve test conditions as specified in Section 22a-430-3(j)(7)(A) of the Regulations of Agencies, such as maintenance of Connecticut State appropriate environmental controls, shall constitute an invalid test and vill require immediate retesting. Failure to submit valid test results constitutes a . permit violation.

(d) Results of the toxicity tests requirad asthepartDischarge of this permit condition shall be entered _on Monitoring Report (DMR) for the month in which it was the appropriate parameter code.

performed, using Additionally, complete and accurate test data, including all supporting chemical / physical measurements performed in as well as association with the toxicity tests, dose / response data shall be entered on the Aquatic Toxicity.

Monitoring Report form (ATMR). The ATMR shall be sent to the following address:

Aquatic Toxicity Connecticut Department of Environmental Protection Vater Compliance Unit 122 Vashington Street Hartford, CT 06106 (e) If any test result indicates that the maximum daily toxicity limit for the effluent has been exceeded, a second sample of the effluent shall be collected and tested as described above and the results reported to the Commissioner within 30 days of the receipt of the first set of test-results.

(f) If any two consecutive test results or any three test results in a single year indicate that the maximum daily toxicity limit has been exceeded, the permittee shall immediately take all reasonable steps to eliminate toxicity wherever possible and shall submit a report for the review and approval of the Commissioner in accordance with Section 22 a-430-3 (j ) (10) (c ) of the Regulations of Connecticut State Agencies describing proposed steps to eliminate the toxic impact of the discharge on the receiving vaterbody. Such a report shall include a proposed time schedule to accomplish toxicity reduction.

MM. Discharge Serial No. 007

Description:

Surface Water Runoff (Discharge Code 108000n)

Receiving Stream: Niantic Bay via Settling Pond (Basin Code-2000)

Present/ Future Water Quality Standard: SA/SA Flow Intermittent l

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42 NN. Discharge Serial No. 008 Monitoring Location: 1 Descriptions Unit No. - 1 Non-Contaminated Floor Drains and Surf ace Vater Runof f _ Including Vater Vashes and Clean Vater Drains (Discharge Code 1080000)

Receiving Stream Niantic Bay (Basin Code 2000)

Present/ Future Vater Quality Standard: SA/SA Flov: Intermittent (1) The maximum concentrations specified belov shril not be exceeded at any time.

Maximum Minimum Instant. Frequency Sample Lleits of Sneoline Tvoe Parameter Code 20.0 mg/l Monthly (c) Grab

-011 and Grease-T 70030-019 30.0 mg/l Monthly Grab Total Suspended 00530-019 Solids (a) The permittee shall record the instantaneous flow (Code 00058-078) at the time of grab sample collection.

(b) The report shall include. a detailed explanation of any-violations of the limitations specified above.

(c). Monitoring monthly- required only when oil- separator discharge occurs.

00. Discharge Serial No. 009 Monitoring Location: 1 Description Unit No. 2 Non-Contaminated Floor Drains. Fire Pump House Floor Drains. Vater Vashes. Clean Vater Drains.

and Surface Water Runoff '(Discharge Code 1080000) l Receiving Stream: Long Island Sound via Quarry Cut-Present/ Future Water Quality Standard: SA/SA l

l Flows Intermittent-(1) The maximum limits specified below shall not be exceeded at any time.

Maximum Minimum Instant. Frequency Sample Limits of Samoling Tvoe Parameter Code t.

20.0 mg/l Monthly (c) Grab Oil and Grease-T 70030-019 30.0 mg/l Monthly Grab Total Suspended 00530-019 Solids The permittee shall record the instantaneous flov- (Code (a) _ 00058-078) at the time of grab sample collection.

b 43 (b) The report shall include a detailed explanation of any violations of the limitations specified above.

(c) Monitoring monthly required caly when oil' separator discharge occurs.

PP. Discharge Serial No. 011

Description:

Surface Vater Runoff (Discharge Code 108000n)

Receiving Stream: Long Island Sound Present/ Future Water Quality Standard: SA/SA Flow: Intermittent QQ. Discharge Serial No. 012

Description:

Surface Vater Runoff Including Fire System Flush Vater (Discharge Code 108000n)

Receiving Stream: Long Island Sound Present/ Future Vater Quality Standard: SA/SA Flov: Intermittent RR. Discharge Serial No. 013

Description:

Surface Vater Runoff (Discharge Code 108000n)

Receiving Stream Long Island Sound Present/ Future Vater Quality Standard: SA/SA Flov Intermittent SS. Discharge Serial No. 014

Description:

Surface Vater Runoff (Discharge Code 108000n)

Receiving Stream: Niantic Bay Present/ Future Vater Quality Standard: SA/SA Flow: Intermittent TT. Discharge Serial No. 015

Description:

Surface Water Runof f Including Vatervashes and Clean Vater Drains (Discharge Code 108000n)

Receiving Stream Niantic Bay-Present/ Future Vater Quality Standard: SA/SA Flow: Intermittent UU. Discharge Serial No. 016 Monitoring Location: 1

Description:

Unit No. 2 Non-contaminated Floor Drains, Vater Vashes, Clean Vater Drains, and Surface Vater ' Runoff (Discharge: Code 1080000)

Receiving Stream: Niantic Bay Present/ Future Vater Quality-Standard: SA/SA Flow: Intermittent (1) The caricum concentrations specified below shall not be-exceeded t

at any time. .

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44 Maximum Minimum Instant. Frequency Sample Limits of Samolinc Tvee Parameter Code 20.0 mg/l Monthly (c) Grab Oil and Grease-T 70030-019 30.0 mg/l Monthly Grab-Total Suspended 00530-019 Solids .

(a) The permittee shall record the total flov (Code 74076-007) and the number of hours of discharge (Code 81381-079) for each day of - the sample collection and/or the instantaneous .

flow (Code 00058-078) at the time of grab sample collection.

(b) The report shall include a detailed explanation- of any violations of the limitations specified above.

(c) Monitoring monthly required only when oil separator: ,

discharge occurs.

i VV. Monitoring Site No. 01 Unit Nos.1, - 2, and 3 Intakes (Before Condensers) j Minimum Frequency Sample Code of Samelina 1121 Parameter-74076-07 Hourly Instantaneous Flov

-Temperature F 00011-015 Hourly Instantaneous

Total' Copper 01042-028 Semiannual (a) Daily Composite-01051-028 Semiannual (a) Daily Composite ]

1 Total Lead : Daily; Composite Total Nickel 01067-028 Semiannual (a) 01092-028 Semiannual (a) _ Daily Composite.

Total Zinc Daily Composite-Ammonia - N 00610-028- Semiannual (a) i Total Suspended 00530-028 Semiannual (a) -Daily composite y 7

Solids _

Surfactants- 38260-028' Semiannual (a) Daily Composite Anionic 70030-028 Semiannual (a) Grab' 011 & Grease Total (a) Concurrent with April and October toxicity _ testing _ in with Paragraphs 3.B.(6)(b), 3.J.(6)(b), land l accordance 3.V.(6)(b). l

!- 4. (a) On or before six months af ter ' issuance, submit for the review and s

approval 'of the - Commissioner three (3) definitive (LCjn)- analyses of Discharge Serial Number 001C-4. .These te=ts shall be conducted using daily _ composite samples of the discharge collected on separate l

veeks. Testing shall be conducted following the toxicity testing L

protocol for. static acute toxicity testsLin ' Methods for Measuring the l Acute Toxicity of _Ef fluents to Freshwater and Marine Organisms" (EPA 600/4-85/013) with the following specifications:

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l 45 (i) Mvsidersis behie (5 days old or less) and Cverinodon variecatus (30 +/- 5 days old) shall be used as test organisms.

(ii) Synthetic or natural seavater adjusted to a salinity of 28-32 ppt shall be used as dilution water in the tests.

(iii) Test duration shall be 48 hours5.555556e-4 days 0.0133 hours 7.936508e-5 weeks 1.8264e-5 months for Mvsidocsis bahia and 96 hours0.00111 days 0.0267 hours 1.587302e-4 weeks 3.6528e-5 months for pyprinodon varietatus,.

(iv) Each sample shall be analysed for the following parameters: chromium, copper, lead, nickel, zinc,total, iron, magnesium, manganese, cyanide amenable- and total oil and grease, total suspended solids, total residual chlorine, COD, surfactants and ammonia.

c onc entradons , in (b) (i) In determining LC 50 values, e ( ) tes duplicate, shall be utilized.

eu ne y e c mpu a nal mecod (ii) The LC 50 va ue sa (Binomial Distribution, Probit Analysis, Moving Average Angle, which yields the smallest 95I confidence Spearman-Karber) the interval and LC value which is consistent with 5

dose-response da .a. 0 (iii) Any test in which the survival of test organisms is less than ninety (90) percent in each replicate control test chamber or failure to achieve test conditions as specified in Section 22a-430-3 (j )(7)( A) of the Regulations of Connecticut State environmental Agencies, such as maintenance of appropriate controls, shall constitute an invalid test and vill require immediate retesting. Failure to submit valid test results constitutes a permit violation.

5. The permittee shall conduct or continueentrainment to conductstudies, biologicaland studies intake of the supplying and receiving waters, impingement monitoring. The studiesfinfish shall include studies of intertidal communities, and entrained and subtidal benthic ccmmunities, plankton and shall include detailed studies of lobster populations and vinter flounder populations.

6. On or before July 31, 1993 and annually thereaf ter, submit for the review and approval of the Commissioner a detailed proposal for continuing biological studies, entrainment studies, and impingement monitoring as required by paragraph 5.

7. On or before April 30, 1993 and annually thereaf ter submit for the review and approval of the Commissioner a detailed report of the ongoing biological studies as required by paragraph 5 and as approved under paragraph 6.

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-8.

On or before " January 31, 1993 submit for the review and approval of the Commissioner a report on alternatives to reduce entrainment of vinter flounder larvae in accordance with ' Scope of Vork forVinter Cooling Vater Flounder Study. t o. Reduce Larval Alternatives Feasibility Entrainment, May_1992.'

9. (a) On or before February 28,.1993, submit for the review and approval of the Commissioner a scope of study for investigating the impact of thisa' At facility's macrofouling centrol practices on Niantic Bay.

minimum, the scope shall includes (i) A proposal to determine the area in which chlorine can be detected and the duration of the impact.

(ii) A proposal to determine the mixing characteristics of chlorine from the condenser cooling water discharge with the receiving water.

(b) On or before November 30, 1993, submit for the review and approval of the Commissioner, a final report describing the results of the Impact Analysis Study conducted according to the approved scope of study.

10. On or before June 30, 1993 submit for the review and approval of the Commissioner a scope of study report to. investigate minimization of the use and discharge of ethanolamine=at Unit No. 2.

11. On or before June 30, 1994 submit for the review and approval of the Commissioner an engineering report on minimization of the use and discharge The-of ethanolamine at Unit No. 2 in accordance with Pcragraph 10 above. for include- specific recommendations and a schedule report shall implementatien.

1997 This permit shall expire on December 14 The permittee shall comply with the following sections of the Regulations of. Connecticut State Agencies which are hereby incorporated into this permit Eggtion 22a 430-3 General Conditions

-(a) Definitions (b) General (c) Inspection and Entry (d)Effect of a Permit (e) Duty (f) Proper Operation and Maintenance (g) Sludge Disposal (h) Duty to Mitigate (1) Facility Modifications; Notification (j) Monitoring. -Records and Reporting Requir2 rents (k) Bypass (1) Conditions Applicable to POTVs (m) Effluent Limitation Violations (Upsets)

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47 ?

F (n) Enforcement (o)P.esource Conservation (p) Spill Prevention and Control (q) Instrumentation. Alarms. Flov Recorders (r) Equalization F

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O *a g 48 22a-430 4 Precedures ard Criteria (a) Duty to Apply (b) Duty to Reapply (c) Application Requirements (d) Preliminary Review (e) Tentative Determination (f) Draft Permits, Fact Sheets (F)Public Notice, Notice of Hearing (h)Public Comments (i) Final Determination (j)Public Hearings (k) Submission of Plans and Specifications. Approval.

(1) Establishing Ef fluent Limitations and conditions (m) Case by case Determinations (n) Permit Issuance or Renewal (o) Permit Transfer (p) Permit Revocation, Denial or Modification (q) Variances (r) Secondary Treatment Requirements (s) Treatment Requirements for Metals and Cyanide (t) Discharges to POTVs - Prohibitions Your attention is especially dravn to the notification requirements of subsection (i)(2), (1)(3), (j)(6), (j)(9)(C), (j ) (11) (C) , (D), (E), and (F),

(k)(3) and (4) and (1)(2) of Section 22a-430-3.

This Permit requires the payment of an annual compliance determination fee as set forth in Section 22a-430-7 of the Regulations of Connecticut State Agencies.

The Commissioner reserves the right to make appropriate revisions to the permit in order to establish any appropriate effluent limitations, schedules of compliance, or other provisions which may be authorized under the Clean Vater Act or the Connecticut General Statutes or regulations adopted thereunder, as amended. The permit as modified or renewed under this paragraph may also contain any other requirements of the Clean Vater Act or Connecticut General Statutes or regulations adopted thereunder which are then applicable.

Entered as a Permit of the Commissioner on the 14 th day of December, 1992.

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' Robert E. Moore Deputy Commissioner APPLICATION NO.89-379 PERMIT ID. CT0003263 ORDER ID. VC l

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ML20126M600

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