ML17227A355

Discusses NPDES Permit Mod Issued by EPA on 920228

ML17227A355
Person / Time
Site:	Saint Lucie
Issue date:	03/18/1992
From:	Sager D FLORIDA POWER & LIGHT CO.
To:	NRC OFFICE OF INFORMATION RESOURCES MANAGEMENT (IRM)
References
L-92-78, NUDOCS 9203250010
Download: ML17227A355 (28)

Text

DOCKET 05000335

05000389,

SUBJECT:

Discusses NPDES Permit modification that was issued by U.S.

Enviornmental Protection Agency on 920228.

ACCELERATED DISTRIBUTION DEMONS TION SYSTEM REGULA Y INFORMATION DISTRIBUTICJL SYSTEM (RIDS)

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ACCESSION NBR:9203250010 DOC.DATE: 92/03/18 NOTARIZED:

NO FAgIL:50-335 St. Lucie Plant, Unit 1, Florida Power a Light Co.

50-389 St. Lucie Plant, Unit 2, Florida Power

& Light Co.

AUTH.NAME AUTHOR AFFILIATION SAGER,D.A.

Florida Power 6 Light Co.

RECIP.NAME RECIPIENT AFFILIATION Document Control Branch (Document Control Desk)

DISTRIBUTION CODE:

C001D COPIES RECEIVED:LTR J ENCL TITLE: Licensing Submittal: Environmental Rept Amdt NOTES:

SIZE:

Related Correspondence S

RECIPIENT COPIES ID CODE/NAME LTTR ENCL PD2-2 LA 3

3 NORRISgJ 1

1 RECIPIENT ID CODE/NAME PD2-2 PD COPIES LTTR ENCL 1

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INTERNAL: ACRS OC/LFM R ~1L'E EXTERNAL:

EG G SIMPSON,F NSIC 6

6 1

0 1

1 2

2, 1

1 NRR/DET/ESGB 8D OGC/HDS3 RGN2 DRSS/RPB NRC PDR 1

1 1

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D NOTE TO ALL"RIDS" RECIPIENTS:

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PLEASE HELP US TO REDUCE WAS'ONTACTTHE DOCUMENT CONTROL DESK, ROOM Pl-37 (EXT. 20079) TO ELIMINATEYOUR NAMEFROM DISI'RIBUTION LISTS FOR DOCUMENTS YOU DON'T NEED!

TOTAL NUMBER OF COPIES REQUIRED:

LTTR 20 ENCL 18 Er/

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P.O. Box 128, Ft. Pierce, FL 34854-0128 March 18, 1992 L-92-78 10 CFR 50.36b

.10'CFR 50.4 EPP'.2.3 U. S. Nuclear Regulatory Commission Attn:

Document Control Desk Washington, DC 20555 Gentlemen:

Re:

St. Lucie Units 1 and 2

Docket Nos.

50-335 and 50-389 NPDES Permit Modification Attached is an information copy of the National Pollutant Discharge Elimination System (NPDES) Permit modification, which was issued by the U.

S.

Environmental Protection Agency on February 28, 1992.

This document is being sent pursuant to Section 3.2.3 of the St.

Lucie Units 1 and 2 Environmental Protection Plan.

Should you have, any questions on this information, please contact us

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Very truly yours, D. A.

ager Vice esident St. Lucie Plant DAS:JJB:kw cc:

Stewart D. Ebneter, Regional Administrator, Region II, USNRC Senior Resident Inspector, USNRC, St. Lucie Plant Attachment

.DAS/PSL N650-92 9203250010 920318 PDR ADOCK 05000335 I

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< J 0 J Q Q an FPL Group company

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FEB-Zi'-1'992 12: 4b I-RL'N DER TALLAHASSEE ENV. PROT. AGENCY P. 82 Florida Department ofEnvironmental Regulation tL "::.,';.:;,::.:-;

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2tain 'BVSaata DtBCe BidS.

O 2600 Blair StOne ROad 0 'ISSahaaaee, trlOdda 32399-2400 Langton Chlla ~ Governor Carol M. Browner. Secreta!y February 27, 1992 Nr. Dames H. Scarbrough, Chief Hater Permits and Enforcement Branch United States Environmental Protection Agency 345 Courtland Street, Northeast Atlanta, Georgia 30308 Re:.Haiver of State Certification FP&L St. Lucie Power Plant FL0002208

Dear Nr. Scarbrough:

On Zanuary 21, 1992, the EPA requested state certification of the modified NPDES permit for the Florida Power

& Light St. Lucie Nuclear power plant surface water discharge located in St. Lucie County, Florida (FL0002208).

This letter pxovides official notification that the state waives certification of this permit.

All effluent limits in the NPDES permit are at least as stringent as those specified in the state's permit, for this facility.

Xf you have any questions regarding this facility, please contact Jan Nandrup-Poulsen at 904/488-4520.

Sincerely, REH/jmp cc:

Tim Powell obert E. Heilman, P.E.,

Chief Bureau of Mater Faciliti.es Planning and Regulation

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UNITED STATES ENVIRONMENTALPROTECTION AGENCY R EG ION I V 345 COURTLANDSTREET. N.E.

ATLANTA.GEORGIA 30365 FEB 2 8 1992 CERTIFIED MAIL RETURN RECEIPT RE UESTED REF:

4WM-WPEB Dr. Martin A. Smith, Ph.D Manager Air and Water Permitting and Programs Florida Power 6 Light Company Post Office Box 078768 West Palm Beach, Florida 33407-0768 RECElVED MAR 9

1992 MAiiAGER ENVIROiXI"I:-ITALAFFAIRS RE:

Final Modification of NPDES Permit No. FL0002208 St. Lucie Plant

Dear Dx. Smith:

Enclosed is the final modification of the National Pollutant Discharge Elimination System (NPDES) permit for the above-referenced facility.

This action constitutes the Environmental Protection Agency's final permit decision in accordance with Title 40, Code of Federal Regulations (C.F.R.)

Section 124.15(a).

The permit modification will become effective as specified, provided that no timely request for an evidentiary hearing is received by the Agency.

Only conditions of the permit which have changed as a result of this modification may be contested.

Any interested person may contest this decision by submitting a timely request for an evidentiary hearing (hearing) pursuant to the procedures at 40 C.F.R.

5 124.74.

If a request for a hearing is received by the Agency, following review, a

determination will be made and the requester advised of the Agency's decision on the request.

Until that time, please be advised that any request will render the permit modification ineffective pursuant to 40 C.F.R.

5 124.15(b).

For a new

source, a new discharger, or a recommencing discharger, a

hearing request renders the facility without an NPDES permit and the facility may not discharge (unless relief is granted by the Presiding Officer under 40 C.F.R.

5 124.60(a));

If the evidentiary hearing request is granted, in whole or part, to an existing souxce, the effect of the contested provision(s),

and any other conditions not severable from those conditions, will be stayed and not subject to )udicial review pending final Agency action.

In this case, all provisions of the prior permit, as well as, all uncontested provisions of the modified permit shall continue fully enforceable and effective pending final Agency action on the permit appeal.

See 40 C.F.R.

5 124.60.

Printed on Recycled Paper

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To request an evidentiary hearing under 40 C.F.R.

5 124.74, you must submit an original and two copies of the request to the Regional Hearing Clerk at the letterhead address within thirty (30) days from service of this notice.

A copy of the procedures and requirements for evidentiary hearing requests and appeals to the Administrator is enclosed.

For purposes of )udicial review under the Clean Water Act, 33 U.S.C.

5 1251 et sece,, final Agency action on a permit does not occur unless and until a party has exhausted its administrative remedies as required by 40 C.F.R. Part 124.

Further information on procedures pertaining to the filing of an evidentiary hearing request or other legal matters may be obtained by contacting Kevin B. Smith, Assistant Regional Counsel, at (404) 347-3777.

W. Ray Cunningham, Director Water Management. Division Enclosures (3):

Evidentiary Hearing Procedures Final NPDES Permit Amendment to Fact Sheet cc:

Florida DER (with all enclosures, except Evid. Hearing Pzocedures)

'PERMIT NO. FL0002208 Ma)or Non-POTW UNITED STATES ENVIRONMENTAL PROTECTION AGENCY REGION IV AUTHORIZATION TO DISCHARGE UNDER THE NATIONAL POLLUTANT DISCHARGE ELIMINATIONSYSTEM In compliance with the provisions of the Clean Water Act, as amended (33 U.S.C.

1251 et seq.;

the "Act"),

Florida Power a Light Company Post Office Box 078768 West Palm Beach, Florida 33407-0768 is authorized to discharge from a facility located at St. Lucie Nuclear Power Plant Units 1 and 2

Hutchinson Island St. Lucie County, Florida to receiving waters named the Atlantic Ocean from discharge points emumerated herein as serial numbers

001, 002,

003, 004,

005, 006,,

and 007.

in accordance with effluent limitations, monitoring requirements and other conditions set forth herein.

The permit consists of this cover

sheet, Part I 9

pages, Part II 16

pages, Part III 5

pages, Part IV 2

pages, and Part V

4

, pages.

This permit became effective on November 1, 1987.

Modification of this permit authorizes the discharge of Betz Clam-Trol CT-1 biocide for use in the St. Lucie plant's once-through cooling water system.

This modification shall become effective on March 2, 1992.

This permit and the authorization to discharge shall expire at midnight, October 31, 1992.

FEB

~ p flap Date Issued W.

Ray Cunningham, Director Water Management Division

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Page I-1 Permit No. FL0002208 Part I A.

EFFLUENT LIMITATIONS AND MONITORING REQUIREMENTS 1.

During the period beginning on the effective date of this permit. and lasting through expiration, the permittee is authorized to discharge from outfall serial number 001 Condenser once through cooling water an auxiliary equipment cooling water to the Atlantic Ocean from Units 1 and 2.

Such discharges shall be limited and monitored by the permittee as specified below:

EFFLUENT CHARACTERISTIC DISCHARGE LIMITATIONS MONITORING RE UIREMENTS

Flow, (MGD)

Discharge Temperature,

'C

( F)

Temperature

Rise, C

( F)

Total Residual Oxidants Auxiliary systems, mg/1 Total Residual Oxidants Condenser, mg/1 Condenser Chlorine Addition, minutes/day/unit Free Available Oxidants, mg/1 Boron, mg/1 Clam-Trol CT-1 (CT-1), mg/1 (whole product)

Acute whole Effluent Toxicity 8/

Instantaneous Maximum 45 (113) 1/2/

16.7 (30) 1/ 2/

0.03 (See Below) 0.10 (See Below) 120 See Below 4.0 (net) 0.40 Measurement Hourly Hourly Hourly Continuous Continuous Daily 1/Meek 4/

Duration of chemical treatment 6 discharge Sample ape Pump logs Recorders Recorders Recorder 3/

Recorder 3/

Log Multiple grabs 5/

Grab Multiple grabs 7/

6/

Free available Oxidants shall not exceed an'average concentration of 0.2 mg/1 and maximum instantaneous concentration of 0.5 mg/1 at the outlet corresponding to an individual condenser dur3.ng any chlorination period.

Neither free available oxidants (FAO) nor total residual oxidants(TRO) may be discharged from either unit condensers for more than two hours in any one day and not more than one unit may discharge FAO or TRO from its condensers at any one time.

Additionally, TRO shall not exceed a maximum instantaneous concentration of 0.10 mg/1 at any one time as measured in the discharge canal prior to discharge to the Atlantic Ocean.

Page I-2 Permit No. FL0002208 Part I.A.1 CONTINUED Auxiliary equipment cooling water systems may be continuously chlorinated;

however, TRO shall not exceed a maximum instantaneous concentration of 0.03 mg/1 prior to entry into the Atlantic Ocean at times when only these sources and/or the sewage treatment plant are being chlorinated.

In the event that TRO levels at the terminus of the discharge canal equal or exceed 0.02 mg/1, the permittee shal]

implement a minimization study as indicated Part III G.

Samples taken in compliance with the monitoring requirements above shall be taken at the following locations:

Intake temperature and flow at plant intakes, free available chlorine at the outlet corresponding to an individual condenser, and all other parameters in the discharge canal prior to discharge to the Atlantic Ocean.

1/

At the point of discharge, the heated water temperature from the diffusers shall not, exceed 45'C (113'F) or 16.7'30'F) above ambient at any time except that the maximum discharge temperature shall be limited to 47.2 (117 F) or 17.8'C (32 F) above ambient during condenser and/or circulating water pump maintenance, throttling circulating water pumps to minimize use of chlorine, and/or fouling of circulating water system.

This temperature may be measured at a point within the discharge canal.

(In determining the temperature differential, the time of travel through the plant may be considered).

In the event that discharge temperature exceeds 45'C (113'F) the permittee shall notify the Director of the Water Management Division in 5 days.

2/

The ambient ocean surface temperature shall not exceed 36.1'C (97'F) as an instantaneous maximum at any point.

3/

During periods of monitor outage of more than 7 days, monitoring for TRO shall be conducted 1/wggc on not less than three grab samples during daylight hours.

Additional grab samples shall be conducted during periods of TRO discharge from condensers.

4/

When batch discharges are required from the refueling water storage tank and non-aerated waste hold up tanks (4).

5/

Multiple grabs shall consist of grab samples collected at the approximate beginning of FAC/TRC discharge and once every 15 minutes thereafter until the end of FAC/TRC discharge.

6/

Each individual conduit treatment is limited to a maximum of 24 hour2.777778e-4 days <br />0.00667 hours <br />3.968254e-5 weeks <br />9.132e-6 months <br /> duration.

Only one conduit may be treated in any forty-eight hour period, i.e., forty-eight hours must elapse from the start of treatment for one conduit before start of treatment of the second conduit.

For each series of conduits sequentially treated, analytical measurements shall be conducted on multiple grab samples from the first conduit and from the third conduit of each unit treated, provided -that no greater quantity of CT-1 is added per conduit than was added to the first conduit.

If the dose is increased, analytical measurements shall be conducted of the affected conduit.

Page I-3 Permit No. FL0002208 Part I.A.l CONTINUED Multiple Grabs is defined as individual grab samples collected at the start of the discharge containing the CT-1 treatment and at four-hour intervals for the duration of the chemical treatment and discharge.

Lethality to more than 50% of any test species in a 100% effluent in a test of 96 hours0.00111 days <br />0.0267 hours <br />1.587302e-4 weeks <br />3.6528e-5 months <br /> duration or less, will constitute a violation of FAC (October 30, 1991) Section 17-4.244(3)(a) and the terms of this permit.

The testing for this requirement shall consist of 96-hour acute static renewal and/or 96-hour acute flow-through toxicity testing (see part V, Sections A and/or B, respectively, of this permit).

These tests shall be conducted concurrently until use of either test method is approved in accordance with Part III.J of this permit.

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Part III Page III-1 Permit No. FL0002208 J.

Evaluation of Flow-throu h Versus Static-Renewal of Acute Toxicit Testin During the application of Betz Clam-Trol CT-l, the permittee shall conduct concurrent 96-hour static-renewal and flow-through acute toxicity tests (as indicated in Part V, Sections A and B, respectively, of this permit).

For both tests, a comparision of the LC50 values shall be conducted, and analytical measurements of product remaining shall be taken at Og Gg 12'8'4'6(

48) 72, and 96 hours0.00111 days <br />0.0267 hours <br />1.587302e-4 weeks <br />3.6528e-5 months <br /> and shall be measured values (not nominal values) to determine toxicity persistence.

Toxicity testing results and analytical data shall be submitted to EPA in accordance with reporting requirements as contained in Part U of this permit.

Based on an evaluation of this information, EPA will make a determination regarding the most appropriate test method and the other method may be discontinued.

K.

Environmental Fate Stud for Clam-Trol CT-1 Within 30 days of the effective date of this modification, the permittee shall submit a plan of study on the environmental fate of Clam-Trol CT-1 in salt water to EPA for review.

Within six months of the EPA approval of the plan of study, the permittee shall conduct and submit to EPA the results from the study:

1) the study shall be conducted using 100% effluent,

2) chemical analysis shall be conducted once every two hours and 3) a die-away curve shall be established depicting the fate of Clam-Trol CT-1..

L.

Additional Reo ener Clause Within two years of the effective date of the permit modification, the permit may be modified, or alternatively revoked and reissued, to include other limitations, monitoring and/or other appropriate conditions based on results of the toxicity testing program or other additional applicable data.

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Page V-1 Permit No. FL0002208 PART V Whole Effluent Toxicity Testing Program A.

Static Renewal Testin As required by Part I

of this permit, the permittee shall initiate the series of tests described below beginning in March 1992 to evaluate whole effluent toxicity of the discharge from outfall 001.

All test species, procedures and quality assurance criteria used shall be in accordance with Methods for Measurin the Acute Toxicit of Effluents to -Freshwater and Marine Or anisms, EPA/600/4-90/027, or the most current edition.

The control water shall consist of receiving water prior to any influence from the facility.

A standard reference toxicant quality assurance test shall be conducted concurrently with each species used in the toxicity tests and the results submitted with the discharge monitoring report (DMR).

Alternatively, if monthly QA/QC reference toxicant tests are conducted, these results must be submitted with the DMR.

1.

a.

The permittee shall conduct 96-hour acute static-renewal toxicity tests using the mysid shrimp (M sido sis bahia) and inland silverside (Menidia ber llina).

b.

k The tests shall be initiated using a grab sample collected at the mid-point of a biocide discharge event.

Solution renewals shall be done using a fresh sample collected every 24 hours2.777778e-4 days <br />0.00667 hours <br />3.968254e-5 weeks <br />9.132e-6 months <br /> from the point of discharge.

Solution renewal at 48 hours5.555556e-4 days <br />0.0133 hours <br />7.936508e-5 weeks <br />1.8264e-5 months <br /> shall be done using a fresh sample collected at the mid-point of the biocide discharge event of the next conduit treated.

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Zf control mortality exceeds 10% for either species in any

test, the test(s) for that species (including the control) shall be repeated.

A test will be considered valid only if control mortality does not exceed 10% for either species.

Xf, in any separate grab sample test, 100% mortality occurs prior to the end of the test, and control mortality is less than 10% at that time, that test (including the control) shall be terminated with the conclusion that the sample demonstrates unacceptable acute toxicity.

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Page V-2 Permit No. FL0002208 PART V Whole Effluent Toxicity Testing Program.

A. Static Renewal Testin cont'd 2

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~ The toxicity tests specified above shall be conducted once every two months or once per application, whichever is less, until 6

valid bimonthly tests have been completed, and once every 6

months thereafter for the duration of the permit, unless notified otherwise by EPA.

These tests are referred to as "routine" tests.

b. Results from "routine" tests shall be reported according to EPA/600/4-90/027, Section 12, Report Preparation (or the most current edition),

and shall be submitted as an attachment to the DMR.

Such results are to be entered on the DMR in the following manner: if less than 50% survival of a test species occurs in any of the four separate grab sample tests,

'<100%'hould be entered on the DMR for that species.

If 50% or greater survival occurs in all four separate grab sample tests,

'>100%'hould be entered.

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b.

If unacceptable acute toxicity (greater than 50% lethality of either test species within the specified time) is found in any "routine" test, the permittee shall conduct additional acute toxicity tests on the next, application occurring before the next scheduled "routine" test.

These toxicity tests shall be conducted using the specie(s) indicating unacceptable toxicity.

For each additional test, the sample collection requirements and test acceptability criteria specified in Section 1 above must be met for the test to be considered valid.

The additional tests will be used to determine if the toxicity found in the "routine-test is still present.

Results from additional tests, required due to unacceptable acute toxicity in the "routine" tests, shall be submitted in a single report prepared according to EPA/600/4-90/027, Section 17, Report Preparation (or the most current edition) and submitted within 45 days of completion of the third additional, valid test.

4. All tests shall be conducted using the following dilution series:

O'.

effluent (control),

6.25%,

12.5% effluent, 25% effluent, 50%

effluent, and 100% final effluent, collected in the discharge canal.

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Page V-3 Permit No. FL0002208 PART V Whole Effluent Toxicity Testing Program B. Flow-throu h Toxicit Testin As required by Part I

of this permit, the permittee shall initiate the series of tests described below beginning in March 1992 to evaluate whole effluent toxicity of the discharge from outfall 001.

All test species, procedures and quality assurance criteria used shall be in accordance with Methods for Measurin the Acute Toxicit of Effluents to Freshwater and Marine Or anisms, EPA/600/4-90/027, or the most current edition.

The control water shall consist of receiving water prior to any influence from the facility.

A standard reference toxicant quality assurance test shall be conducted concurrently with each species used in the toxicity tests and the results submitted with the discharge monitoring report (DMR).

Alternatively, if monthly QA/QC reference toxicant tests are conducted, these results must be submitted with the DMR.

1 ~ a ~

b.

2.a.

The permittee shall. conduct 96-hour acute flow-through toxicity tests using the mysid shrimp (M sido sis bahia) and inland silverside (Menidia ber llina). All tests shall be conducted using a flow rate of five 90% replacements of water volume in each test chamber every 24 hours2.777778e-4 days <br />0.00667 hours <br />3.968254e-5 weeks <br />9.132e-6 months <br />.

In addition, the dilutor system should be operated 24 hours2.777778e-4 days <br />0.00667 hours <br />3.968254e-5 weeks <br />9.132e-6 months <br /> prior to adding the test organisms during which time adjustments can be made in the temperature, flow rate through the test chambers, and aeration.

If control mortality exceeds 10% for either species in any test, the test(s) for that species (i.'ncluding the control} shall be repeated.

A test will be considered valid only if control mortality does not exceed 10% for either species.

If, in any

test, 100% mortality occurs prior to the end of the test, and control mortality is less than 10% at that time, that test (including the control) shall be terminated with the conclusion that the sample demonstrates unacceptable acute toxicity.

The toxicity tests specified above shall be conducted once every two months or once per application, whichever is less, until 6 valid bimonthly tests have been completed, and once every 6

months thereafter for the duration of the permit, unless notified otherwise by EPA.

These tests are referred to as "routine" tests.

b. Results from "routine" tests shall be reported according to EPA/600/4-90/027, Section 12, Report Preparation (or the most

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Page V-4 Permit No. FI0002208 PART V Whole Effluent Toxicity Testing Program B. Flow-throu h Toxicit Testin cont'd current edition),

and shall be submitted as an attachment to the DMR.

Such results are to be entered on the DMR i th f ll if less than 50% survival of a test species occurs in any test,

'<100%'hould be entered on the DMR for that species.

entered.

If 50% or greater survival occurs in each test

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3. a. If unacceptable acute toxicity (greater than 50% lethality of either test species within the specified time) is found in any "routine" test, the permittee shall conduct additional acute toxicity tests on the next application occurring before the next scheduled "routine" test.

These toxicity tests shall be con ucted using the specie(s) indicating unacceptable t 't a

e ox'.cz y.

a i ional test, the sample collection requirements and test acceptability criteria specified in Section 1 above must be will be met for the test to be considered valid.

The add't' t t i zona es s

test is still present.

e used to determine if the toxicity found in thee rou one

b. Results from additional tests, required due to unaccept bl t

y routine" tests, shall be submitted in a single a

e acu e

report prepared according to EPA/600/4-90/027, Section 12, Report Preparation (or the most current edition) and submitted within 45 days of completion of the second additional, valid test.

4. All tests shall be conducted using the following dilution series:

0%

effluent (control),

6.25%,

12.5% effluent, 25% effluent, 50%

canal.

effluent, and 100% final effluent, collected in the discharg isc arge

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UNITED STATES ENVIRONMENTALPROTECTION AGENCY R EG ION I V 345 COURTLANO STREET. N.E.

ATLANTA.GEORGIA 30365 DATE:

FEB 2 8 19@

AMENDMENT TO THE FACT SHEET AT THE TIME OF FINAL MODIFICATION APPLICATION NO.:

FL0002208 NAME OF APPLICANT:

Florida Power 6 Light Co.

St. Lucie Plant A.

Chan es to Permit from Draft Permit to Final Permit Sta e:

Part III, Page III-1, Item L.

The reopener clause is changed from:

"In two years from the effective date of the permit modification..."

to, "Within two years of the effective date of the permit modification..."

This is to clarify that the permit may be modified, or d

d is evaluated during the two year study, to include other limitations, monitoring and/or other conditions as appropriate 2.

Part V, Page V-l, Item l.b.

For the acute static renewal testing, the proposed method for renewing the solution in the test chamber is changed from:

"Solution renewal shall be done at 24 hours2.777778e-4 days <br />0.00667 hours <br />3.968254e-5 weeks <br />9.132e-6 months <br /> with a portion of the original sample that has been kept refrigerated.

Solution renewal at 48 hours5.555556e-4 days <br />0.0133 hours <br />7.936508e-5 weeks <br />1.8264e-5 months <br /> shall be conducted using a fresh sample collected at the mid-point of the biocide discharge event of the next conduit treated.

Solution renewal at 72 hours8.333333e-4 days <br />0.02 hours <br />1.190476e-4 weeks <br />2.7396e-5 months <br /> shall be done with a portion of the sample taken at 48 hours5.555556e-4 days <br />0.0133 hours <br />7.936508e-5 weeks <br />1.8264e-5 months <br /> that has been kept refrigerated."

to, "Solution renewals shall be done using a fresh sample collected every 24 hours2.777778e-4 days <br />0.00667 hours <br />3.968254e-5 weeks <br />9.132e-6 months <br /> from the point of discharge.

Solution renewal at 48 hours5.555556e-4 days <br />0.0133 hours <br />7.936508e-5 weeks <br />1.8264e-5 months <br /> shall be done using a fresh sample collected at the PdnfPd '

mid-point of the biocide discharge event of the next conduit treated."

The purpose of the proposed procedure was to allow the organisms to be continuously exposed to the biocide.

Since the biocide is injected on an intermittent basis, it was determined that this procedure would not demonstrate actual environmental conditions.

Futher-more, the revised sampling procedure will allow a more accurate comparison between the static renewal and the flow-through tests, since both tests will now reflect actual environmental conditions.

3.

Part V, Page V-2, Item 3.a.

and Page V-4, Item 3.a.

For static renewal and flow-through testing, in the event acute toxicity is demonstrated in a "routine"

test, the procedure for conducting additional tests is changed from:

"If unacceptable acute toxicity (greater than 50%

lethality of either test species within the specified time) is found in any "routine" test, the permittee shall conduct additional acute toxicity tests on

~an application occurring before the next scheduled "routine" test to, "If unacceptable acute toxicity (greater than 50%

lethality of either test species within the specified time) is found in any "routine" test/

the permittee shall conduct additional acute toxicity tests on the next application occuxring before the next scheduled "routine" test."

This is to clarify that the permittee shall conduct an additional toxicity test on the ver next a lication available instead of arbitrarily, to determine if oxicity found in the a "routine" test. is still present in the discharge.

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6.

Part U, Page U-2, Item 4 and Page V-4, Item 4.

For static renewal and flow-through testing, "6.25%" is added to the dilution series requirements.

Part V, Page V-3, Item l.a.

For flow-through testing, the sentence, "All tests shall be conducted using a flow rate of 90% replacement of water volume in each test chamber every 24 hours2.777778e-4 days <br />0.00667 hours <br />3.968254e-5 weeks <br />9.132e-6 months <br />."

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is changed to, "All tests shall be conducted using a flow rate of five 90% replacements of water volume in each test chamber every 24 hours2.777778e-4 days <br />0.00667 hours <br />3.968254e-5 weeks <br />9.132e-6 months <br />."

This is changed in accordance with the EPA toxicity testing guidance manual referenced on Page V-3 of the permit.

7.

Part V, Page V-l, Item A and Page V-3, Item B.

For static renewal and flow-through testing, the sentence:

"The control water and effluent used will be adjusted to a salinity of 20 parts per thousand using artificial sea salts as described in EPA/600/4-90/027, or the most current edition."

is changed to, "The control water shall consist of receiving water prior to any influence from the facility.

In addition, feeding shall be done at 48 hours5.555556e-4 days <br />0.0133 hours <br />7.936508e-5 weeks <br />1.8264e-5 months <br />."

The word "effluent" was omitted because the facility's effluent which is once-through cooling water is marine water and meets the salinity requirements of the EPA toxicity testing guidance manual.

The control water requirements were revised since the facilty will be utilizing water from the plant intake as the control water as allowed by the EPA guidance manual.

B.

Public Comment:

None.

C.

State Certification:

State certification was requested on January 21, 1992.

State Certification was waived by letter, from the Florida Department of Environmental Regulation, dated February 27/

1992.

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