ML20006G157

Forwards Renewal Application for NPDES Permit NH0020338,per App B to License NPF-67.State of Nh EPA Determined That Requested Changes to Discharges 001,022,023 & 024 Will Not Jeopardize Environ When Full Power Operation Begins

ML20006G157
Person / Time
Site:	Seabrook
Issue date:	02/21/1990
From:	Feigenbaum T PUBLIC SERVICE CO. OF NEW HAMPSHIRE
To:	NRC OFFICE OF INFORMATION RESOURCES MANAGEMENT (IRM)
References
NYN-90044, NUDOCS 9003050235
Download: ML20006G157 (73)

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' NeW No'mpshire feel C, F._ * - -

Senior Vice President and Chief Operating ORicer p

NYN-90044 I.

February 21, 1990 United States Nuclear Regulatory Commission Washington, DC 20555 Attentions-Document Control Desk

References:

(a) Facility Operating License NPF 67. Docket No. 50-443 (b) NHY Letter NYN-90029 dated January 31, 1990, 'Seabrook Station NPDES Permit Modification *, T. C. Feigenbaum to

'USNRC

Subject:

Seabrook Station NPDES Permit Renewal Gentlemen:

A copy of the New Hampshire Yankee (NHY) renewal application for the Seabrook Station NPDES Permit No. NH0020338 is provided as Enclosure 1.

The renewal application, provided to the Environmental Protection Agency and the State of New Hampshire under separate cover, is submitted in accordance with Section 3.2 of the Environmental Protection Plan (Nonradiological), Appendix B to Facility Operating License NPF-67. The current Seabrook Station NPDES Permit expires on August 25, 1990, and the renewal application is required by 40 CFR 122.21 to be submitted at least 180 days prior to the expiration of the existing permit.

New Hampshire Yankee has determined that the requested permit modifications will not involve an unreviewed environmental question and do not involve a change in the Environmental Protection Plan. Additionally, the Environmental Protection Agency and the State of New Hampshire have reviewed the requested changes to Discharges 001, 022, 023 and 024, and have determined that they are of minor technical nature and will not jeopardiae the environment when Seabrook Station begins. full power operation. A copy of the January 18, 1990 Environmental Protection Agency letter to NHY is provided as Enclosure 2.

New Hampshire Yankee will continue to operate within the guidela.aes I.

provided by the existing NPDES Permit until such time as the Environmental Protection Agency issues a new or modified permit.

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PDC New Hampshire Yankee Division of Public Service Company of New Hompshire P.O. Box 300

• Seabrook, NH 03874

• Telephone (603) 474 9521 1

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United States Nuclear Regulatory Commission February 21, 1990 Attention: Document Control Desk Page two i

'Should you require any additional information regarding this natter, please contact Mr. Terry L. Harpster. Director of Licensing Services, at (603) 474-9521, extension 2765.

Very truly yours, t

[Mb Ted C. Feigenbaum ec Mr. William T. Russell Regional Administrator United States Nuclear Regulatory Commission Region I 475 Allendale Road King of Prussia PA 19406 Mr. Victor Nerses Project Manager Project Directorate I-3 United States Nuclear Regulatory Commission Division of Reactor Projects Washington, DC 20555 Mr. Noel Dudley NRC Senior Resident Inspector P.O. Box 1149 Seabrook, NH. 03874

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M' dW Ham shire Ted C. Feigenbaum Senior Vice Picsident and Chd Opeaing OHicer NYE-90014 February 21, 1990 Mr. Edward K. McSweeney

. Chief, Wastewater Management Branch United States Environmental Protection Agency John F. Kennedy Building Boston, Massachusetts 02203.

References (a) NPDES Permit No, NH0020338 (b) NHY Letter NYE-89056 dated November 6, 1989, ' NPDES Permit Modification," 7. C. Felgenbaum to E. K. McSweeney

Subject:

HPDES Permit Renewal Application

Dear Mr. McSweeney:

The New Hampshire Yankee Division (NHY) of Public Service Company of New Hampshire hereby submits, in accordance with 40 CFR 122.2(d), a renewal application for National Pollutant DischarEe Elimination System (NPDES)

Permit No. NH0020338 for feabrook Station which expires on August 25, 1990.

The renewal; application, which is comprised of EPA Form 3510-1 and EPA Form 3510-2C is provided as Enclosure 1.

Additionally,'we have included a list of proposed changes to the effluent limitations and monitoring requirements as Enclosure 2.

We request that these modifications to our existing permit be process d along with the previous siodifications that we transmitted on November 6,1989, via Refer-ence-(b).

New Hampshire Yankee will continue to meet all current NPDES Permit requirements until such time as the Environmental Protection Agency issues a permit modification.

The following clarifications are provided regarding the details of

_the application.

Seabrook Station has not operated at greater than 52 reactor power since the present NPDES Permit was issued in July of 1985.

Operational data is not available since only testing of various systems and components has been performed. Accordingly, the g-information provided on EPA Form 3510-2C is based upon preoperational data or best engineering estimates.

Effluent test analyses have not been conducted. We intend to conduct the effluent tests after three months of Station operation at power. _The results of these tests will be submitted to the Environmental Protection Agency as a revised EPA Form 3510-2C with a request for a modification to the NPDES Permit.

New Hampshire Yankee Division of Public Service Company of New Hampshire P.O. Box 300

• Scobrook, NH 03874 5 Telephone (603) 474 9521 i

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, /* L United Statds Environmental Prot:ction-Ag;ncy-

_Febru:ry' 21, 1990'

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'Att;dticnt-Mr.-Idward K. McSweeney Page 2 E

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The effluent characteristics of outfall'003, the back-flushing

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operation for biofouling control of the intake water system,. are the 1

same'as outfall 001l_the circulating water system, except for an I

-increase in temperature and_the-absence of chlorine.

Therefore, ve.

are not submitting Item V Parts A B, and C of EPA Form 3510-2C for outfall 003.

• - There have been no changes in the design or: operation of the-intake or discharge structures orithe receiving waters since the original-

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issuance of the NPDES Permit. We certify that the biological, j

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' conditions"within the'Hampton-Seabrook estuary and the near shore j

marine environment have not changed beyond that associated with natural l

F, variability.

Supporting material has been presented within annual C[.

Baseline Characterization' Reports provided to both the: EPA and the State of New Hampshire.

Consequently, we consider the 316(a) and 316(b) documentation that was previously cubmitted to' remain valid'and l

it is not being resubmitted.

=:Should you require additional infonnation regarding this matter, please

- contact Mr. James M. Peschel, Regulatory Compliance Manager. at (603) 474-9521,

,I extension 3772.

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Very truly yours, f

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Ted C. Feig nbaum n

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' Department of Environmental Services Water Supply and Pollution Control Division ~

• State of New Hampshire 6 Hazen Drive, P.O. Box 95 l

Concord, NH 03301 E

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ENCLOSURE 1 TO NYE-90014 EPA FORM 3510-1 AND ATTACHMENTS EPA FOPJi 3510-2C AND ATTACIMENTS T

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31. POLLUTANT CHAR ACTE R1STICS 7Miwi42Fifx1M4MT.MKf4fWGtLWINWHisWBenFAiMfwE INSTRUCTIONS: Compitte A through J to determine whetter you need to submit any permit applittlion forms to the EPA.hu ansv.er"yes"to any questions, you must submit this form and the supplemental f orm listed in the parenthesis following the qutrtion. Mark "X"in the box in the third Column if the supplemental form is attached. If you antwer "no" to esth questicn you need fict submit any Cf these formt You may enswer "no if your tet!yity a

is excluded from permit requirernents;see Section C ci the inttw:tirt:s. See else. Se: tion 0 of the in tructions f or definitions of Lold-f aced termt

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A. Is this facility a publicly owned trestrnent works B. Does or will t'us facility leither en/ sting or proposed /

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which results in a discharge to waters of the U.S.?

gX incluce a concentrated animal IDeding operation or

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(FORM 2A) aquatic animal production facility which results in a discharte to waters of the U.S.? (FORM 28)

C. As trus a tacdity wntcn currentiv resutts ir. oischarges l

Q. Is tnis a proposto facuity lother char # those ccxtetta to waters of the U.S. other than those descriced in A

in A cr B abovel which will result in a discharge to IX !

I A or 9 above) IF CRM 2C) waters cf the U.S.) (F ORM 20) n n

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munic:cti effluent below the lowermost stratum con.

tainir;g, within one cuarter rnile of the well bore.

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hazardous wartes? (FORM 3)

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7 structicos and which will potentially emit 100 tons A

instructions and which will potentially emit 250 tens per tear of any air pollutant regulated utider the per year of any air rollutant regulated under the C:can l

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8. SIG ee A f u R E C. D A T E $ 6G H E C.*

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APPLICATION F R PEEMIT TO f_ ISCHA 1 E E ASTEWATE. [ q t 4g M EXISTING MANUFACTURING, COMMERCIAL. MINING AND SILVICULTURAL OPER ATIONS [ N90Es Consclidated Pr:rmits Program (

i. OVT F A L L. L 0 CAT ON l.MM-Q)MhM9.F;WiMMd.bMjlidMti4.EQMQM2OTJGQTU@9DWehI@hj For each outfall. titt the latitude and lonD'tude of its location to it e neartst 15 seconds ana tr.e name of the receivinti water.

A. O TF LL e.LATstvDE C. LON Gi1 vDE l nors .... 1 ..u. ..-- 6 ..m t i i 001 42 53 1 43 70

t. 7 I 27 I Atlantic Ocean 002 42 54 1 06 70 51 l11 l Erowns River 003 42

. 54 17 70 47 l12 ~l Atlantic Ocean l l l I I l 1

11. FLOWS,50VRCES OF PCLLUTICN. AND TRE ATMENT TECHNcLCGIES ~ N t'& M 7. M !$ Q 9 7 8 D N f M I M EfE M M A. Attach a line drawing showing the v,ater flow thrcuch the fac14ty. Incicate Nrens of iraane water, operations centributing was:ewster to the ef t19ent, s'id treatment units lateled to correspond to she more detailec tt!criptiers in !! m E. Cor.struct a water balance en the lire cromrig by showing avtrege fl0ws between intakes, CCeratiCns, tflatment Whits. 8nd obt'&Cs. II 8 V.&te' ta!3nce Cannot te determif'ed hr p., /pr certain mm/rp act!vi!.ts/, CrCvide 3 pictorial description of the nature en:! amount of eny sourets of water 6r.d any ccMeetien or trestrrent measu'es.

9, For ecen cutfait, provice a de:cription of: (1) All cperot.cns contributing waste aster to the eff: vent inciucing process westewater, scrmary veastewater, cochng water, and storm water runoff: (2) The avercge flow contributed cv escn ocerotion: and (3) The trestrrent received by the y,aste.Nater. Cont'nWe en additional sheets if necessarv. g, 7 99,

2. C# E N A T iO NIS) C O NT 84 titV tin G F L OW

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a, oc se nt,TieN 001 Condenser, Auxiliary Cooling 714 MGD Continuous Chlorination 2F l 4B Demineralizer Wastes 0.36 MGD Neutralization l 2R l (022) Secondary Plant Leakage 0.03 MGD Oil Separation, Filtration l 1H IN (025) Distillation, Neutral-

0. 61 MGD Evcporation, Filtration 1D 1F ization Wastes; Steam Gener-Neutralitation, Distillatien l 10 '

2J _ ator' Blowdown Demineralization l 4B l (027) Cooling Tower Blowdown 0.50 MCD 1.ow-levelChlorination, Scale l 2F l XX Control l 002 Storm Runoff 6.1 MGD Settlement, Neutralization l 1U 2K l 4A (021) Treated Sanitary Waste 0.035 MCD Primary, Secondary Aeration, 10,1L 1M,1 Q l Disinfection 2F,3A 3B,4A (023, 024) Secondary Plant 0.03 MGD 011 Separation, Filtration 'lH IN 1,caka ge (026) Chemical Cleaninr, 1.0 MGD Settlement, Meutralization 1U 2K Wastes 4A 003 Back-flush Operation 677 MGD Heat Treatment XX 4B i I . V E tGl A L UkL O ttL v (glftucn t gundefmes gu tp cartrgnett,) EPA Form 3510 2C (Rev. 2 85) PAGE 1 OF 4 W NIQ UC ON EtVt'66

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1. ID ENT4PIC ATION OF CONDIYtON.

1. A F F ECTED OUT F ALLS l A O M E EM ENT. ETC.

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.sy., l g,,g \\ l i i i 1 k l i l i I I 1 I I l C. OPTION AL: You mov attach ad&tione sheets ceter U ~g any ado.t<o"at water pt>%.uun tortrot proyams for <>rher enoonment.J urosec your c/ischepes) yr,o now have u+iderw iy or which you plan. Indicate waethat pl41ned $thedVh!$ for CQmtruChon, e9Ch p;, gram es new untlerv.ay or cianneu. nnr1 muitate yo.sr octual or g pg..g.' lF DE SC MIP YlON O F A DDIT tC N A L C ON T Rol PrioG rt Ard 5 IS AT T AC H E D - EPA F.rm 3610 2C (Rev. 2 85) PACC 2 Or 4 CGNTINUE ON PAGE 3

s &l& s A, B,p Q: See instructions before proceeding - Comp';te one set cf tables 1:r each cutfall - AnnXte the tutf all number in the space pr!vided: , NOTE:.hlites V A. V B. and V C cre Included en separate sheets numbered V.1 thr:vDh V 9.

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>, Use the space beioW to litt any of the pollutants listed in "lable Ic 3 of the insttuctiorss, which you kriow of have reason to believe is discharged or may be ~ discharger, from any cuttall, For every pollutant you list, b*iefly cncribe the reasons you believe it to be present and report any anaiytical cata in your possession.

1. POLLUTANT

3. sOU 8t C c

t. POLLUTANT

e. s0URC c '

1 e S:e supplemental Information P I vi. POT E NTI A L DISCHARG ES NOT COV E R E D BY AN ALYSIS].g{,(*,MMy,$g/*{Q,M,hiEFQFf/y[*,)((%2g Kjgp]*.[QQ j is(nypollutant hsted in item V C a substance or a component of a sucstance wruch you currenuy use or rnanuf acture as en in*ermeciate or hr altroouct or byproduct? C y ts th<t a!! auch pr>::utants a..i.,wo X no re, r a tt.m VI.D) b EPA Form 3510 2C (Re. 2 85) P A C E 3 C F.t CONTINUE CN REVERS

,w,-v i wrvrnum im rnun 3 N#hWNWWf Do you have any knowledge cr reason 11 tiotieve that any bioiopical test f or acute et chrinic taxicity has been tuce e,n any of yrvr discharges or ren as ., receiyingwater in relation 13 yIur discharge within the lost 3 years? 'Dits lidentity the teatral<xnd avscrebr thver purpown belmel X No tea to section V111) a VyCCNTRACT ANALYSIS 8NF0RtAATiON,MMhMT!['[@fd@M%T(fk]Qf@[rfg[.3%%)h@ggdMyM[!yh l were any of the analyses reportec in item V perforrr'ed by a contract tacoratory or corisultmg fem? e "its filst fine name, address qnd teleplione r. umber Of Qnd pollutantJ ~ T NO Igo to Secticos lXi eranlyted by, toch sucrt takorotary or firer l bclows ~ l

e. ADDRESS G ME*GU r 'rra ener & no I lR.N M TA W ANAL m o A.NAME

+ i a sto e I 4 E g l I ' IX. CE R TlF ICATIONDADADR4iL'MMaWP3tMN8.@JKQ9hhl$[MIMTNEN MINSNi Ic:rttiy underpensity oflaw that this document and allattachments wereprepared under rny direction or supervision in accordance with a system designed to 1 i assure that qualifiedpersonnelproperly gather andevatuste the information submitted Basec on myinquiry of theperson or persons who manage the system or thosipersons directly responsible for gatheritag the information. the information submittedis, to the best ofmy knowledge andbelief. tive. accurate. and complete. \\

l am aware that there are significant penalties for submitting falso information including the possibihty of fine andimprisonment for knowing voolations.

A. N AM E th C F FICI AL TITLE tt}/>c or printi

n. pHoes g NQ fgerg (tHfr g n),

T.C. Feigenbaum, Senior Vice President (603) 474-9521 R I 'l C SIG N ATU R E D QATESIGr4EQ 2.) 7O s EPA Form 3S10-2d (Rev 2 85). PAGE a CF a

m .m -__p tra e.v. nuunt n tre ey frame it. e r t of reses r is ~ Pt. EASE PRINT OR TYPE IN THE UNSH ADED AREAS ONI.Y. You may refert some or asti of p,c. Afi,,,,,,,,p 4. NUD001257446 OArFNo 2000(IP59 g this informat.on on separate sheets (use the same formarf irestead of completiner these swy-s. Asvreveteeswes F2-3F-85 . 4 SEE 4NSTRUCTIONS. h5EN[MdkN[ b N O "" ' "' ' V. INTAKE AND E F Ft.UENT CHAR ACTERISTICS (continued from page J of Ferm 2-C1 gN M b h_ g p -- yyggggge-

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2 .J 3g 58 E= 2e t-e.- 2 s s e, s a t. E~- ece >o = m ~ C' O$g g { EN E9 k" EE m2$ E{ ci ? g g l w' o

• N c0 gg" gc-T --4 2 r e tt f 2A4 Obe c"

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e 2 ggi,:

g A e _e,,s a_.sp..a s _q_ ~d_ E ' '. _. h, _, 7_. 5n. :.g r e s,2 : ;; = 3_s:m ap_ 8,,3 .y.. 5 s o o 3 .m_

F8'e*s'no 2000 cos> - agra s D. NUsesER (e.g*y ftpose Efene f **f harme If O UTf"AR.t_MUt*80C** on ,s, , r we si.sr.ss CCNTifJUED FROM PAGE V4 - NHDOB1257446 001 e

4. tJee8 TS S. Sf4TM. E" t. p - W

1. POLLtJY ANT r.mennes*x*

j

3. E r r t.t s s ed T a town v e st*A NUMDE fi

[,* M;df,M;,

s. M A st ana uw pa st.Y V At.ut O. M A m enet/M,, 3,0,ED A.;v v a a.ut c.a.oNG T C ft,** AMG). V A 4.ut

'i,"," [, conegn. J r,gghtvacut f.N D C A S g 3 og ,,r t 8 L*,- * *,* 1 4... '"^""" s.: -... _, 8, f,,,, s i -... 8;f,,,,,_ v,s.. vse s r r 3 6t<s g C?.; ..t.,,,,, 6;f,,,,,,Q _GC/MS FR ACTION - BASE /NEU*RAl. COf.fPOUNDS (coatinued* a 228.1.4-Dichloro-benzene (106-46-7) I 238. 3.3 -06ch4oro. benridine (91-94-1) X 248. 06etatyt Phthalate (s a se-21 X 258. Dienethvf r%thatate (131 11-3) X 2sn. orN-eurve Phthafate (84-74 2) X 2 781. 2,4 D w*i tro-sek e.w,(*2r-t4 27 X 28 4. 2.G-Diaette. ~ teserene (606 20 21 2019. Os N.Ostyt Phattatste (11782Op X_ 3.2 D6 Sher'vl-300 t hedrat6ese (as.4:n ten:eney (122 661, X 318. F tuorsnthe**e (2(44401 y 32 0. F heocene (Sei-73 7) y 33G Hesacedososcerene si t A 72.t* g + _32es. Hens-cfttO*otnet adW (87-63-35 X _ _,, _,,, _ ~, 358 Henachtoro. cyctopentadvene (7 7 47-.t) X 360. &#da ochloto-ethaec (67 72-1) X 370. Gruicao it.2.J <sti Preene ~ (193 39 55 X 3C11 e semhrn one (70 59-11 X 39n. N ..haseo. N_ 4013. Nftect=ces:cese (91.995 31 X __. 310. N Net-o-so.f= net h y tsettene ~ (62159) X 420. N-Nitrosotti-N #eopy1Jntir1d 16214 477 X sosewee.e eo noe w a

-F a.. s a. y ^~ '.L 4 t w. T [ CONTINUE's FftOM Tile FRONT ~ - =

1. PO Lt.U T A N T z, M a net m*

3; t f Tt.tvr n y -

4. UMtTS -

- S. tMT Ae(C presessa 10;,,$;,0;,

a. M A M BMUM O A tt.Y V At.USC g,. M A n tMtf na 3 9.e 1 A V V a t.tsC ' c.a.OMw TI;ftM A Me#G. w A s.* PC 4 "]' a' L AND CAS,

e e.ogo. g e sees ge neasses a ses M f ,, c owe g,.. GCATS FR ACTION - B ASC/NEUTR At. COMPOUNDS tea fie.a.ref) _ sis.y ,p e g. -. . v se s' '""Y'*" g g,m y g n " NU M DCR > 8*l l(s/ seme8 hfef I."!.; f *1,,,d 1,s f,, f,C* ' tit.. 229. N tietr0-smfig>henylantine y^ W'30~O 448. Phenanthrene t,541 -a ) X a -- -. ~ -. -. 450. Pyrene 329 otio) X 460.1,2.4. Tr6 chtoroben rene ~ E' - + f 120 82 1i GCATS FRACTION - PESTICIDES iP AMeen ' th ce 2) NA .2P,de Ot4C E3to 8.* ein NA

• tP. [ 13HC '

13 40 S'J 73 NA SP. 7 tttaC (E A 89 9) gg SP. 45 13HC (3193Gtil ?!A e4P Chestene.so.e l t5 7-74 9' NA 2 FP, 4# Of)1 tso 79 31 pg itP. J# OOf-472 SG 9) gg

97. 4.4'- D O O (72 54 85 pg

.__._.a_ .y l' t oP, oi. i.s. 9, (60571) NA .A f it*. el 1.twb.tatt. sos (1 tit 29 7) NA 121'NFmfoseffaet t115 29 7) NA 138% E ewsomstf ars

1. .nalf ate e sca t.or s:

NA 1.3P. CeWif tet f F2 20 fil NA

~

.-_w 1$P. E eMfues At*4chyste t 742I-93 il g g, u.. tee. a senexwo, t it>44 s > yg 8' A G C V-8 . CON TINUE ON PA4 EPA Form 3510-2C (Rev. 2-05) ~ - -. _= .. -.~

...-.-g. w. ? . Fo.r.m Appre**eto ~ m aoo,,. 4'~. tra s.o. revuotn tropy freme iam i euf Venenen 19 ous r. An. eevuotst. e' ~ CONTINUED FROM PAGE V-8 NHDOB1257436 001 Approare awer 72-J?-85

1. POLt.UTA F4T

z. m a n n x' 3.EFFt.OCNT~

. UNfTS . TNT A M E 8ep;? --. f ph%hy "tq _,, - J U M D E f7 "7J *M *lLf =*; s. Ma xeuuM O AsLY WAt.UE ~ ""

• T"M,I.Np* ""

" *i[NOnNf* h 8' 4 "U [ , co,,cy,,. s manoa i-g y,=- v ,,_, gi,,, , e,s.,,,_

i. i _...

.s.., .y g :: s e..:.,, _ ty.,,,,_ ~<.f.~.1..<<i GC/MS FRACTION - PESTICIDES rerwriawe<ff 17P. Heptachlof

ponide (102?S7 3 NA 18P. PC B-1242 (5 346'A21-9) pg 19P. PCB 1254 (11097 69-1)

NA 20P.PCs 1221 (11104-28-2) pg 21P. PCG 1232 (11141-16-5) NA 22P.CCo 1248 (12G72-29 6) pg 23P.PCO 12GO (19094-82 5) pg j I 24P.PCn 101G (12674-11-2) g 25P.Tomanhene (s001 35-2) . NA 1 ^ EPA Form 3510-2C (Rev. 4 84) h & 6 7-

4--- .y y g

s. :c

_d ... ~ ..-e w. Term AMed., Ef* A f.D. NUMDCff fropy freom Ifem f s.f rewm #1 PLEASE PRINT OR TYPE IN THE UNSH ADED AREAS ONLY. You may report some or mil of - this information on separate sheets (use the same formarf instead of completing these pages. NIIDO81257446 '- Ous N 20004059 At'repet e'swer72-37 85 SEE INSTrtOCTIONS. ' f,'.Q'? N.-! N k q. 2 - outr Y ~ -_.-x z!~ r- ~ c-V-V. INTAKE AND E FFt.UENT CH AR ACTERISTICS (continued from page 3 of Form 2-CfM" F" -' ' " -_m=- 7 ~ 1 ? :- 2' m.'.3; r.c.. 002...- PAfkT A - You must provide the results of at least one analysis for every pollutant in this tabte. Comp!ete one table for each outf all. See instructions for additiona

3. U NITS

4. INT AME forric.neff

2. EFFLUENT I. pot.LU TANT

s. uaxsuuu o Asty v At.oe b. m a x sg,j,paf,D)* "^ * "'

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• d A O L*A$", e '

g,so.- A u p g,,o A o yo, g. C C N-gg,,,, . g,9 gy) u, g g A # At.v 5CS

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a. Osochem* cal Oxvsen Demand (180D)

b. Cheniscat j

Onvsen Demand ' (CO D)

c. Total Organic Caruon (TUC)

A Totat suspen.emi Solkts (TNN)

e. Ammonia (or NJ vALuc v A s.u s; V A Lut; v A a_u t

f. F low vALuc V^*"'

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h. Temperature isummer}

'MtNGMUM M A x sMUM ptNeuuu ~ niA x su um ST AND A RO UN1TS 3 DH N s Mark "X" en cofumn 2 a for each poffutant you know or have reason to believe is present. Atank X"in column 2-b for each poltertant yoes beleeve to be absent. If y which is limited either directfy.or indirectfy but expressly, in an of fluent lemitations Guittetine. You must twovide the results of at least one analysis for that potiutant. For PART 0 - column 2a.you must provide quantitative data or an explanation of their presence in your discharge. Complete one table for each outf all. See the instruction

4. UNITS

5. INT AKE (opriopaff -

3. EFFt.U ENT

\\" 1.POLLUT.

2. H A n s< 'x -

A E A ALUE A N A t.' a toNCCH-g, gg I.Na-IcI*Y "'"* " "" ^ ' " " ^ ' * " 8 I 8 ' " ' ' * ,,,,,,[,3,,,,,,,, M e so nt "^7"" (if atcildbicJ .T."., .7=~e,,,,,,p,3,,,,,,, fr) ass ,,,,,, p),,,,,,,, (sl ass ,,,,,,p,I,,,,,,, M =ams vsu C S JO

a. eromi.ie (2-8959 67 91 y

h Chtorine. Total Resisfuel

c. Color X

L A Fecat Colsform y

c. f-hsori.fe (1698448 8) y

f. Nitrate--

Nitrito (as NJ y CONTINUE Ord REVERSE P AGE V-l EPA Form 3510-2C (Rev. 2-85)

Mg,a - G nS D E v E ~ g "f A f P s m. e 4 i f i O r = y E e = U ( 9 J t 8 r EF Mg i f T T 4 A f Tg O C Nm o .h I [*. d / ac c ss a m T I N U g" M. t s nc Mus v n d. E U. + l + A V a l s ( }} A, t T 2 6, v G [*

• C N

O G L. A C P T U. N t. E V UL Y, 3, g F j$ F E i, 3m 3 " f y T1,,, X' [* c u L A V g y t g s A O m u T us)a Jf x J, O A _'J. R M F S ) M e B O x' X_ { 2

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X R f g g_ X a. F X g y y v g e e D R E A

n

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m ^ cr>A n.n. Muu ntn fcossy hum stem I enf hme si ou T r A t.t. N un oc ee ' ~ NHDOE1257446 ~ 002 OMB No 2000 DOS 9. CONTINUED Ff10M PAGE 3 OF FOf1M 2-C ' Approverentarres 7207 85_ PART C - If you are a primary industry and this outfall eontains process wastewater. refer to Tabte 2c.2 in the instructions to determine which of the GC/MS fractions you must test for. Mark ~r en coloret 2 a for att such GC/MS fractions that apply to your industry and for All., toxic metals cyanides. and total phenots. If you are not required to mark column 2.a (secondaryindustries, nonpreces wastewater ouffalls, andnonrequired GC/AfS fractionsf. mark '~X"in column 2.b for eat;h po!!utant you know or have reason to believe is present. Mark ~X~ in column 2-c for each pollutant ye believe is absent. If you mark column 2a for anypollutant.you must provide the resuf ts of at least one analysis for that po!!utant.lf you matk column 2b for any pottutant.ycu must provide the resull of at least one analysis for that pollutant if you know or have reason to believe it will be discharged in concenteations of 10 ppb or greater. If you mark column 2b for acrolein, acrytonitrile. 2. dmitrophenot, or 2-methyl-4. 6 dinitrophenol, you must provide the results of at least one analysts for each of these pollutants wtuch you know or have reason to believe that you discharge i concentrations of 100 ppb or greater. Otherwise. for pollutants for which you mark cettemn 2b. you must eit her submit at least one analyses or briefly describe the reasons the pollutant is expectedI be discharged. Note that there are 7 pages to this part; please review each carefully. Complete one tabfela// 7pages/ for each outfall. See instructions for additional detants and requirement 1

1. pot.t UTANT

2. M a n n x*

3. CFFLUENT

4. UNITS

5. INT A KE forrioned MD a ve s,-

b.. c.

c = =-

s. M A X IM u M D Alt.,Y V A LU E "med,fa gh aNhy. V A.UC

""*I ^" ,g no, o p a CONCEN-A ERA A 1.U E

• "?

4*.*.*.*" *5.",,,,,, [,(,,,,, f al mass ^ "

• g' g)

TR ATION

g. ) c.o,n,c e m M""**

=_. ,,,,,,,I,,,,,, Dj wa** (Al"*** MO (if apodobfd same et ou. METALS. CYANIDE. AND TOTAL PHENOLS I M. Antimony. Total (7440 36 0) y 2M. Arsenic. Total (7440 38 2) y 3M. Deryt6iu.en Total. 7440 417) y .. ~. _. . ~. - 4M. Castetuum. Totat ( 7440..a;n 0) y SM. Cheomium. Total ( 7440 4 7-3) y 6M Comer.Totas E .. _ _ _ ~. ~. - 7M tsad. Total (7439 92 11 y f1M. Mmory. T o3.0 (7439 D 7-6) y DM. Nicical. Total (7440 02 0) y 10M. Seten6um. Totst { 7782-49-2) y 1IM. Silver. Total i1440 22-4i y 12M. Thallium. Total 17443 28 0) y 13M. Zinc. Total (7440 6G 6) y 14M. Cyanie. Total 157-12 5) y. ISM. Phenots. Totaf X DIOXIN 2,3,7,3. T et ra. nEscntuE HCSUS 1S ctsforo<fibenzo P. y Dioxin (1764 01-6) EPA Form 3510 2C (flev. 2 85) P^ ot v.3 CorJTINUE ON f1EVEftSE

.<- v ; n. m m $h e. CONTINUED FROM THE FRONT

l. POLLUTANT

2. M A sa n x-

3. EFFt OENT

/J. U N I T s . IN T A M E.fortioess

b. M s.x sgM gygv V As.ue.

c._onc Tyau Ag g. vat.ue; .a e, o n e-r es N SOET 8,..*' jMii.f.7.

a. M A x s uu u O A s t.v V A t.uz Y st ATson g.

(s/ everLatil.*) o{4 IIM ,1

• l,,,,

' is t 4.s. ,,,d',3,,, _ tal.... Ja,3,,, _ (43 ..s vsEs c_o.c g,y,,,, ?.C/MS FRACTION -VOt.ATILE COMPOUNDS - IV. Acrotein (107-f;24) 2V. ;;crytonitrite (107-13-1) y 3v. cunzene (71432) y rV. Bis ICMaro-eneffevf) E ther (542-:: 9 1) X SV. Brornoform (75-25-2) y EV. C4rhon Tetrichtoride (56-23 5) X 7V. Chtorobenzone ( 1 C3 7 ) y DV. Chtorodi-bromomet hane (124 48 1) X OV. Chloroethane 175 00 al X 10V. 2-Chloro-c.thylvinya Ether (110-75 8) X 11 V. Chlorof orm (67663) y 12V. Dichtoro-t>romornethinne (75-27 4) X .__n_-, 13V. Dichtoro. difluoromethane (75-71 8) X 14V.1.1 Dichloro-e:thsn:3 (75-34-3) y ISV.1,2 Oichloro. ethane (107-06-2) y 16V. 1.1 -Dic hloro - schytene (75 35-41 y 17 V. 1.2-Dic h k>r o-pronme (78 87 5) y 18'.' 1.3-DicNoro-propylene (542 75 6) y 19V. E thyIbenzene (100 41-41 y m ov. uc.hva (fromkic (74 83 9) y 21V. Methyt Chlorede (74 87-31 y EPA Forru 3510 2C f Rev ~/.R51 PAGE V-4. CONTINUE ON pad n ~.

1. d

~ i J A* ^ _= ~ F e. s g ~ e ra r ~ i ~ ~ r af ~ C,M a, ~ ~ A u,U ! = ' a ~ Mg s A iU I ~ ~ ~ ~ 7 T,,O * + 4 i t ~ . 's ,C 1 .a M ~ 7 5. 2 ~ - t , i ~ t A'I 'r 7 ~ ~ ~~ - r7 a e 9 e c 1_< e ~ e. r 2. S r A }f - ~ AN m. ~ r l ~- ~ a T 1oA.t i t J ~ t L "^ ~

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Mid e r _r C4 n Tn T e Tn N .T n t. p-t 1.o4 1 o6 os 1 o0 e l O 8 4 2o 27 4 to =e s / n -s .m f s e o PD s C .,,s .r M 2 5' 7. 2 2 o 6,- e f 1 o o ANi~i T r3 .l r .l e s. . r0 .l . r0 .o P 3 Vi6 o Vo. Vy _Vo Vlo o . c . n d l Vli Vo. Vy V e A0 Ao.- N l9 h 0 c5 l9 h 0a 0h C A5 A.e. A. :h A. iAt As At Ae 3Ah t0 C -3% 3C G lhn 3h7 9t m 2. 39 t it t>si /t SC f f I1 1l8 2f 3h 4 G 2C 2c? 2ut 5 6s O 4' s f a i 1 1 1 1 hs t 2( 2O( ci2c( 2e l 1 C [ h til c (- I

l_1,,_ y: - >- - .m y. CorJTINUED FROM TiiE FHONT.

1. PO t_ LU T A N T

2. M a H ** x '

3. 4 8 t 1.t t t:f 47

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m. L O Nt' T'E ss M h,.

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a. M Ax suou o mat _Y V A t.U E ts. ed A M IM tf u 3 g)v V A s.u t; c.LONG T C HM g.. V A L.u r_

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• C O" C 't "'

J..yt;H AUWt.tst A At. h MASS AT8DN p (c, g, ;,,,, m Aveeml - t t -* * ','.,,see. (s)*= ass Y S E. S c e m. e Id (if ocasfADIt) a me C Oeec. m a s eose ee ConCE GC/MS F RACTION _ BASE /NEUTR AL COMPOUNDS 1$. Acensphthene (83-32-9) y ^

23. Acennphtvlene (208 96-8) y

38. Anthracene g

(120-12 7) y (B. Benti< fine (9287-5) y

50. Denzo (a)

Anthracene (56-55-3) y 50.Benro(a) Pyeena (50-32 8) y

78. 3.4-Denzo.

fluoranthene (20s 90 2 X 86.Dento(chip Perytene (191 24 2) X

08. Denzo (k)

F tuotanste me (207 on.9 X 100. Dis (2 Chher<> clitox y) fveth.sne X (111-91-1) 110. flis if Chhue> cihyll Ether (111 44 4) X 128 Bas (2 Chloroeso-prop >0 Emor(102 601) y 130. Bis (2-A'thyf-hcxyff Phth. elate (117 8 t-7) X 140, 4 Bromo-phenytPtenyl Einer (101-05-3) X ~ 15 8. Outyl 13cnryt f*hthalate (U54i3 7) f' 'i N_ 168. 2 Chloro-prphthaleno (91 513-7) X 17S. 4 Chloro-phutyi Phonyt Ettstr (7005 72-3) X 18 0. Chrysene (218 01-0) ~___ _ 103. Dibenzo (4.h1 Ant hraceno (53-70-3) X 200.1.2 Dkhloro-benzeno (95-50-1) X 210.1.3 Dichloro-benzine (541 73-11 y CONTINUE ON PA ' P ACC V-G EPA Form 3510-2C (Ilev. 2-85) l o

f g 4 2 E v fe R ~ w N h O te r ~ e E P M U 4 N Mw. I T 9 i A N . _T e O r Ne - C 5_ 4, o n, I 3 - 9._ '5i L- ~0r 0, i ..fm0, 0m w e0, w 2. r,, gpe. V . AJ ml, S t r rA, ps l f D a, i N O. = U ~ a m s m E e t U. A s tg . V - n i, .- u i ~ s H, 2

g. 0 a0 M

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Supplemental Information Form 222 II.A. Flows. Sources of pollution..and Treatment Technolooies -The following text.should be read in conjunction witIh Figures l', Facility location and Figure 2, Station Water Use. Seabrook Station utilizes water'from two major sources, _the Atlantic Ocean and municipal wells from the Town of Seabrook. In addition, private. wells developed onsite and north of the site along Brimmers Lane could be utilized-to supply additional water needs should additional capacity.be required. These' flows and. water uses are described in greater detail below. -This water is used by Seabrook Station in the generation of electricity. The water is then discharged to the environment via three outfalls, two to the Atlantic Ocean (001, 003) and one to the Browns River (002). OCEAN WATER FLOWS OUTFALL 001 Ocean water is used for cooling equipment (service water), and condensing steam (circulating water). Water is taken into the Circulating Water System through three intake structures located approximately 7,000 feet offshore (Figure 1). From the intakes, cooling water flows through a 19-foot diameter tunnel to the on-site pump house. Approximately 714 mgd will be drawn through the system and utilized for both condenser cooling (677 mgd) and service water cooling (37 mgd). Water from this system will be discharged through the onsite Discharge Transition ' Structure (DTS), traveling through a-19-foot discharge tunnel to offshore multiport diffusers. All monitoring for this discharge takes place at the DTS. Service water for auxiliary cooling is pumped to heat exchangers within the Station for component and Emergency Diesel Generator cooling. The service water mixes with the condenser cooling water prior to entering the discharge tunnel. The Circulating Water System becomes the transport for treated waste drains from the primary plant and treated floor drainage from the secondary plant. Biofouling control is achieved through the use of continuous, low-level chlorination of the cooling water stream within both the Circulating Water and the. Service Water Systems. Chlorine-(sodium hypochlorite) is injected at the offshore intake . structures and at additional locations within the Station as needed.- A chlorine minimization program has been implemented to 1 ()

1 ) v,; determine the minimum level of chlorine discharge into the receiving water, while maintaining a suitable biofouling control of the intake cooling water system and condenser efficiency. j OUTFALL,QQ), In addition to chlorination, thermal backflushing of the ) intake tunnel.may be employed to remove biofouling organisms . attached to system components. This method will involve the reversal of the cooling water flow such that the intakes serve as the discharge (outfall 003) and the discharge ports-function as the intake (see Figure 1). Temperatures within the intake tunnel will be elevated to a maximum of 120 F for a maximum of two 0 hours. The entire flow reversal and heat treatment cycle will occur over a six-hour period at a maximum flow rate of 471,000 gallons per minute. There will be no chlorination of the condenser cooling water during the thermal backflushing treatment. FRESH WATER FLOWS Fresh water is utilized to supply the needs of the Station potable water system, makeup water to the Auxiliary Cooling Towers, water needs to the Demineralization Water makeup system, and makeup to the Fire Protection System. Refer to Figure 2. 1 Fresh water utilized by the Station is derived from the Town of Seabrook municipal well system. Currently, an average of L 110,000 gallons per day are obtained from the Town of Seabrook with a maximum of 320,000 gpd possible. In addition, provisions have been'made to obtain water as needed for system makeup from wells owned by Public Service Company of New Hampshire. These wells are located on site and along Brimmers Lane in the Town of Hampton Falls,-however, they are not currently connected to the potable water system and are unavailable for use. These will be activated as necessary should the demand for fresh water exceed the maximum allowed use from the municipal source. A maximum yield of approximately 500,000 gpd can be obtained from both the onsite wells and those located on Brimmers Lane. All flows will vary appreciably during station operation. Demineralized Water During Station operation, demineralized water is used to ( replace leakage losses from both the primary and secondary water f cycles. There are four major effluent streams from the Demineralized Water Makeup System: demineralized regeneration effluent, Steam Generator Blowdown and related effluents, Primary Plant leakage, and Secondary Plant leakage. 2

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• Th6 mnkaup flow to-ths primtry plant in actimated at

.c 6,000 gpd, but may vary to as'much as 20,000 gpd during Station operation. The water' leaving the system is collected within_the -Waste Test Tank and may be processed by'a combination of filtration, evaporation, and demineralization. Treated water is recycled whenever possible. Treated l'iquid waste effluent will-be discharged following monitoring, to the condenser cooling water effluentJflow just prior to discharge through Outfall 001. 1 Regenerate chemicals for the water treatment plant demineralizers are neutralized before dincharge to the Circulating Water System (Outfall 001). A 30,000 gallon -neutralization tank has been installed to accommodate this system which is discharged via. batch mode to the Circulating Water System. This neutralization tank may be discharged numerous times.on a single day depending upon Station requirements. Outfalls 022.023,024 Oil Z Water Seoarator Vaults The make up to the secondary (power generation) system constitutes the greatest need for demineralized water during Station operation. An estimated 68,000 gallons per day (maximum of 367,000 gpd) is needed. The portion of the flow that leaks or drains from the system is collected _in floor drains and passed through oil / water separators prior to discharge. Each separator has been designed to discharge a maximum of 122,400 gpd. The average flows presented in Figure 2 represent those seen from-these systems since the NPDES permit was issued in 1985. Data is not yet=available to characterize-operational flows from these systems. Each separator is designed to separate oil from drainage. water. 'The oil / water separators are arranged to process drainage piped from the.following buildings and plant. areas: o Oil / Water Separator #1 (Outfall 022)- Emergency feedwater-Pump Hcuse drainage, the Turbine Building sump, the Lube oil Building sump, and the Lube Oil storage Room sump, o Oil / Water Separator #2 (Outfall 023)- Diesel Generator Building sumps and the Auxiliary Boiler Room drainage. o Oil / Water Separator #3 (Outfall 024)- Auxiliary Boiler Fuel _ Oil Storage Tank area, the-Fire Pump House Day Tank area, )q, and the Fire Pump House drainage trench. 3 1 l

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~ T .The1processedieffluent is-discharge to the Atlantic ocean via the circulating Water System outfall 001 (vault #1), and to the-t Browns River via,Outfall 002 (vaults #2 and #3). r outfall All ~ -Steam Generator Blowdown The Steam Generator Blowdown system is designed to remove dissolved impurities.and suspended solids from the secondary side of the steam generators..This is accomplished by continuous blowdown of liquid from each of the four Steam GeneratorG. The blowdown flow is processed to recover and recycle as much of this water as possible. Processing may involve evaporation,_ filtration and demineralization. The non-recycled effluent . stream is then discharged to the circulating Water System flow prior to discharge. ) ~0utfall 025 receivos purified liquid waste and neutralization effluent from the Steam Generator Blowdown recovery regeneration sump. Also monitored and reported through this outfall is the blowdown directly from the Steam Generators,. Steam Generator blowdown distillate, effluent from the Recovery -Test Tank, and discharges from the Waste Test Tank. Each is discharged via batch release to the Circulating Water System (Outfall 001). As operational data is not yet available for these. systems to' provide an accurate. average value, the following maximum discharge capacities are provided: Steam Generator Blowdown; 384,000 gpd Steam Generator Blowdown Distillate; 50,000 gpd i Steam Generator' Blowdown Recovery Sump; 28,000 gpd Waste or' Recovery Test Tank; 20,000 gpd Outfall 211 Chemical Cleanino Chemical cleaning wastes are processed onsite to improve the quality of discharge water prior to their release to the environment. Such wastes may include the nitric acid chemical . cleaning of the sodium hypochlorite generation cells. A maximum of 1 million gallons per day may be discharged from this system depending upon station needs. All discharges will be made via batch mode through the Settling Basin, Outfall 002, or through the proposed outfall 028 to outfall 001. j 4

p?"tw T. ..=. Outfall 027 Auxiliary Coolina Tower ~ A~ mechanical draft cooling tower, installed as emergency -backup to the Service Water System,.has the capacity of removing ~

217-million BTU per hour.

The. tower is filled with approximately 4 million gallons'of. fresh water. The cooling tower will also be utilized during thermal backflushing of the Circulating Water. System.. The flows shown are those related'to.the backflushing process. The-atmospheric discharge of 360,000 gpd has-been calculated for a 10-hour use period. Make up flow would refill the tower over an-18-day period. Salt water may be utilized as m'ake up to the tower should a sufficient freshwater supply not be available. In-such'a case blowdown would be required to eliminate the higher concentration of' solids within the tower. Blowdown of the cooling tower is expected to be performed on a once per month basis, discharging an average of 0.5 million gallons over a one-hour period. I Cooling tower blowdown, should it occur, will be made to the i Circulating Water System (Outfall 001). I OUTFALL 021 Potable and Sanitary Wastes Sanitary wastes are collected and processed at an onsite treatment facility. This-facility employs primary treatment through~the use of an activated sludge treatment, secondary -treatment-through the use of aerated, lagoons, tertiary treatment through' filtration, and subsequent chlorination of the final-effluenu. An average-of 35,000 gpd are processed prior to I discharge.through the onsite Settling Basin to the Browns River at'Outfall 002. l ? OUTFALL 002 Settlina-Basin outfall 002, the Settling Basin, has a capacity of approximately 2 million gallons. The principal influent is site i stormwater. Other influents include the discharge from Outfalls j 021, 023,.024, and 026. Water periodically flushed from portions of the Fire Protection System to the stormwater collection system i may also be present. The combined effluent is controlled through i

f,' s I,J ' an $djustable: weir and is discharged to_the Browns River. ^ In -addition.to the influents listed above, during periods when-the Circulating Water System (Outfall 001) is not in operation, influent to the Settling Basin'may also be' received from outfalls c 022,'025, and.027. 'tormwater Runoff S Stormwater' runoff as a result of-rainfall onsite is-controlled by catch basins, which discharge-to the Settling-Basin; catch basins located at the general office building, which discharge to the adjoining environment; or sheet flow, which is allowed t'o percolate into the ground. The estimated stormwater flow to the Settling Basin during the 2-year, 24-hour rainfall event is 6.1 MGD. Station' drainage areas are outlined in Figure 3. The area -identified by the letter "A" flows to the Settling Basin. The area identified by the letter "B" flows to the environment adjacent to the General Office Building through catch basins. All other drainage is considered to be sheet flow to the adjacent environment. f 6

c. - - ,.g, ~ -AN MUNICPAL ITfvATE OCEAN WATER WEUS 1r TilERMAL - 110.000 GPD 0 GPD NORMAL BACKil_USIIING 2 ' M W.000 W OPERATION (OUTTAt1003) d l I ATMOSPIIEnE I POTABLE 0.36 MGD 1r 37 MGD 677 MGD WATm i n l SYSTW i 1r P Y Y 1r SERVICE CONDEN3ER AUXtuAHY DEMW. FUTE SANITNtY COOLING COOLING COOUNG WATEn Pf10TECTION TO SETTLING TOWER SYSTm SYSTEM - TDEATMENT g 05MGD (OUTTA11027) 35.000 GPD I (OtfTTALL 02t) l I I MAX: 28 MGD MAX.02 MGD MAX:.4 MGD E I I I (OUTTALLS) DEMIN. STEAM WASTE SECONDARY (023. G24) DEGEN-GENERATOG TEST PtNJT ' SYST M DLOWDOWN TUJK IIAKAGE g I f

30. 2 W 1r 75.000 GPD -

30.000 GPD MAX: 0.3 MGD 6.1 MGD (Otf1TAL L 025) f I iP U y y U 1r ClIEMICAL {OUTTAll026) SETTLNG CtEANING BASN 200.bGPD 720 MGD MAX:415MGD (OUTTALL 001) (OtrTTAtt 002) T STATION WATER USE k A11#1 TIC DnOWNS - OCEAN FIGURE 2 nivEn' ee-m,. m. .c-. ..+_...m, .ii_-. - -

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!!]a!..,z... - _ IBOPOSED CHANGES TO EFFLUENT LIMITATIONS AND MONITORING REOUIREMENTS ^ g n4 og u-w fa ' v ' Within theffollowing pages are the proposed-changes.to the Seabrook1

f.y Station NPDES permit (No. NiiOO20338).

Each affected'page of the NPDES permit

.i lis duplicated, with the proposed changes highlighted along with the. v.. _ appropriate' rationales. In' addition, a new discharge point-(Outfall 028), is-f.p - beliig proposedIto handle cleaning of the sodium hypochlorite generation system

cells.

p.- A summary of all changes 'is also given in.. the attached table'. - t ? g i 4 e D 3 L L o L s - r 5284R b

6 ps =~

h., a =7,4

SETTLING-BASIN LI'MITATIONS (002)'

E - +. o w; g. x [x ^' , PROPOSED VERSION p,, . x: )Part.I;A! s r. b-p l' 3;' -During the: period-beginning Tunnel' Activation'Date and lasting through ( ' Expiration.Date,1the permitteeLis-authorized'to-discharge.from outfall(s) Y = serial number (s)1002d,:stormwater runoff, construction runoff, treated . sanitary waste.-and secondary plant' leakage.- 9 Subhdischarges-shallbe'limitedandmonitoredby-thepermitteeas [ 'a.n specifiedlbelow: k U Effluent Discharge Discharge Limitations Monitoring Reouirements k Other Units (Specify)_ ' Measurement ~. Sample Ave. Monthly Max. Daily .Frecuency Type 3 "41.5 Continuous Dailyj Avg i Flow a M / Day (MGD) land Range h' Total; Suspended. 30.0 100.0 Once Daily Grab ' Solids, mg/l Oil and Grease, 15 20 Weekly Grab mg/l j Turbidity, NTU-25 Once Daily Grab- '* Discharge 002.may also-contain cooling tower blowdown and treated demineralizer regenerants, if required for' equipment maintenance, or at E times when there is no flow in the discharge, tunnel. The. dates, duration, and reason for.the diversion of'any,one.or all of these i {t streams from. Discharge 001 to Discharge 002 shal' be reported in d e 2 -monthly Discharge Monitoring Report. n. ,b. -The pH shall not be less than 6.5 standard units, nor greater.than 8.0 _~ tandard units, or 0.5 standard units above that which is naturally-s . occurring at the intake source, whichever is greater, and shall be . monitored weekly by a grab sample. c c.- There shall be no-discharge of floating solids or visible. foam in other.. H -than trace amounts. d e d, . Samples taken in compliance with the monitoring requirements above shall be taken at the point of discharge into the Browns River. I Chemical discharges of hydrazine, ammonia, morpholine, hydrogen peroxide, -l e. ethylene glycol, and propylene glycol shall not be greater than 1 mg/l 1 when present in the discharge. ) i 4 5284R i m+ a

ff,g, m [U m ? '}; ks )dh[ + i REASONS FOR CHANGEi h dA tif-id + .wh I? s ' U,m h A l Asterisk Footnote: M Qy - ~,. g' . (In the'existingjpermit,.itLis.possible"that the footnote indicated by1 an asterisk lcould be misinterpreted as applying only.to secondary plant leakage. m-. ' We' believe that this was 'not the intent of the permit ' authors, and L that ' moving. ~ t gi itheLasterisk:will'make the applicability of'the footnote clear. g (9 B Flow yi y, The daily maximum flow rate.is largely. determined by the rain falling'on-i M Lthe basin catchment area :. Short of reducing'the area er constructing large.- [(andexpensive)l hold-upponds,thevolume-ofwaterentering'thesettlingbasin. %:9*. [ Jduring storms:is3.outside station control, m i k ?The average monthly flew rate is affected by the numb'er.of days ' discharges are made. ;Use of the moveable weir to prevent discharge.on-days ~ thatLrainfall'has muddied--the. basin will raise the average. monthly flow'since- =the flow willibe' averaged over fever days. Effortsuto limit such turbid? F .) '-discharges'ledito averageLmonthly flow exceedances. It seems; incongruous 7that. oattemptsotoilimit exceedances-of one~ type can be discouraged by-the risk off b "exceedances-of.anotheritype. o La 7,

Chemical-Discharges 1 c

.As a course of, normal' operation, Seabrook Station discharges low. ' Econcentrations of-hydrazine, -ammonia, morpholine, - boron: (asi boric acid), j lithium ~ hydroxide,7 hydrogen peroxide,: propylene-glycol, and:eth'ylene glycol I bI cinto the Circulating' Water System (001). These chemicals were not identified' ~ in'the: original permit application, but are used as normal chemical control 4 = agent's in any nuclear power plant. These chemicals, released from Discharge. Points (022) and (025),'will have concentrations of 1.0 mg/l or less and may be released from Discharge Point (002) should the Circulating Water System not. be.available. 5284R 5

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'l9 -

iSEWAGE TREATMENT' PLANT LIMITATIONS (021) N PROPOSED VERSION Part'I.At [4., During the period 4beginning Effective Date and lasting through Expiration e f Date',.the permittee ls. authorized to discharge from outfall(s) serial' - number (s) 021; treated sanitary waste. ~ f Such discharges shall be limited and monitored by the permittee as-e a. v specified below: I 4 Effluent Characteristic. Discharge Limitations Monitoring Reauirements Average Average Maximum Measurement Sample Monthly Weekly. Daily Frequency-Tvoc 2 a - ' Flow - m/dayL(MGD). -(0.05) Continuous: Daily Avg-- and Range BOD, mg/l 30 50 Weekly 24-Hour i Composite-Total Suspended Solids, 30* ~ 50* Reekly. 2t.-Hour-mg/1 Composite = 1 Total-Residual 5.0 Daily When Daily Avg. ' Chlorine, mg/l in Use-and' Range 011.and-Grease-No visible sheen -Daily _ ' 0bse rva tion-; Total coliform, 70' 70 Weekly Grab lcolonics/100m1l Settleable Solids, 0.2 0.3 Da!'y' Grab Iml/1/hrl 4

• These limitations apply during the months of-November through April;-

the limitati6ns will be 50 mg/l average monthly and 100 mg/l maximum f daily.during the months of May through October. b.' :There shall be no measurable temperature increase. J' The pH shall not be less than 6.5. standard units nor greater than 8.0 -c. standard units, or 0.5 standard units above that which is naturally occurring at the intake source, whichever is greater, and shall be-monitored weekly by a grab sample, d. There shall be no discharge of floating solids or visible foam in other than trace amounts, Samples taken in compliance with the monitoring requirements specified e. above shall be taken at any representative point prior to discharge into the primary settling basin. 5284R

yMcM (G :Q' ';- ElW s* fG l h5 i ' REASONS FOR CHANGE _A g'%. / }) hg v re-su .y, i' [ s I [ BOD and TSSE i G p

The permit presently requires'both daily' maximum andLweekly average :

limits'for'bothiBOD and TSS, however, at the specified sample frequency (weekly),.the ' daily.' maximum is numerically equal to the weekly average. The- ~

j s,

requirement is not only redundant, but a single'high result will always_ result 1 [in two exceedances rather than one. skewing'the. reporting.of these parameters j k K and the actions of the? permittee.. BOD and TSS, therefore, are,better expressed by a maximum daily and average monthly-limit. .] = g yq [ ~ Asterisk Footnote = I[ 7 'The value of TSS is seasonally dependent. Duiing warmer months (May s ~ through October) the growth of. algae occurs.. This-is a-natural phenomenon, which in turn elevates the levels;of TSS. This has been recognized by New Hampshire regulators..The seasonal limits will not change the environmental 4 -effects because'TSS; increases during warmer months are-a natural occurrence, a LTotal R'esidual Chlorine Seabrook Station has.experiencedla number of chlorine spikes which-i 'stationLpersonnel have~taken prompt action to minimize. The causesthave been various; - seasonal change, Jtemperature change, instrument f ail'ure - with the spikes being short term and often little in excess ~of the limit. This J u I ' situation is exacerbated-by the station's need to maintain chlorine levels ..near the-permit limit.in order to control coliform,.particularly in the summer 3 when algae levels are high. m -U _The' sewage' treatment plant discharges to the head of the settling basin. ,Q 'During normal operation, other than during and immediately following storms, the basin detention time is in the range of 20 to 40 days. It is unlikely that.any chlorine residual would be detectable at the ultimate discharge into 5_ .5284R

w l-g-[- (- khkdf aA,Jt$$ Browns 1Riv:r,,regtrdless'of-the:instcntinseus chlorink conctntration el, 1 nwh GWiyy[; ,Y 1 1the: sewage treatment plan't discharge. f, b 1 p Short-term spikes in chlorine' concentration in the' sewage treatment-plant F discharge"will be. rapidly averaged by the large. volume of wat'er'in the settling basin'.' - Even without the chlorine demand'of this. water,.it is h, unlikelythatchlorinecouldbedetectableatthefinal-dischargeLinto-the l ~ 4 ^ Browns' River. 'For these reasons, the-daily maximum chlorine-limit is better si u expressed lasl daily average and range rather than as:(instantaneous) daily maximum.

[

~ u r During and following storms, the basin-detention time can fallto aa low-a e as three' hours. -However, the dilution factor under these circumstances would .again render any residual undetectable. e Total Coliform I! The units for this measurement in the existing permit are MPN per I w e i100'ml. The permit does not require.a particular_ coliform determinatio'n rmethod to be used, iThe units could be misinterpreted to favor:the MPN method-over the membrane ~ filter. This can be avoided by changing the units to counts'. per 100 ml or colonies'per 100 ml. 1 c j i 1The presence of a weekly average limit for coliform has the-same effect described above for BOD.and;TSS - being redundant and doubling the exceedance: rate when sampling at'thefspecified rate because the weekly sample is'also the1 -weekly average. The-monthly average, as well as the grab maximum,.are-better -indicators-for showing compliance. q Settleable Solids .t The' units for the settleable solids determination are ml/1/hr, rather than

ml/l as specified within the permit. The technique for this analysis is W

specified.in " Standard Methods for the Examination of Water and Waste Water," published by the American Public Health Association, 16th edition, 1985. The . ave' rage weekly limit of 0.1 ml/1/hr is the lowest limit of detection and therefore values below this limit cannot be taken or reported. The average r l ' 5284R t 4

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p g> l ' i. :, i COOLING-TUNNEL DISCHARGE-(001)- < ;y y %

),3-

/ ~ '. PROPOSED VERSION .Part:I.AJ k-M ?S. 3During the period beginning. Tunnel' Activation Date and lasting through w ' Expiration-Date, the: permittee is authorized to discharge'from'outfall(s) serial number (s) 001. condenser cooling water,' service cooling water, ' liquid waste' distillate,-steam generator blowdown,' cooling' tower >i Lblowdown,"demineralizer waste, and:seconiary plant leakaget. x. a.. !Such. discharges shall be limited and monitored by;the permittee as specified below:: [ Effluent Characteristic Discharge Limitations - Monitoring Requirements-Other Units - (Specify)' Measurement-. Sample > Avg. Monthly Max. Daily Frequency Tyoe-3 Flow-M / day'(MGD) (720) Hourly

• Daily: Avg.

and Range Temperature Rise oT,- 39 41 Hourly-' -Daily Avg. OF*** 'and Range Temperature (Maximum), Hourly Daily Avg;- -0F- 'and Range Total-Residual 0xidants 0.2 mg/l 0.2'mg/1; 3/ Day ** Daily E Avg '., cnd Range-

• The flow rate may be estimated from pump capacity curves and' operational hours.

See Subparagraph "e" below.

• • • Temperature rise'is:the difference betweenithe' discharge temperature-

'and. intake temperature, b. The pH of the. discharge shall not be less than 6.5 standard units,rnor . greater than 8.0 standard units, or 0.5 standard units above that which' is naturally occurring at the intake source, whichever is= greater. j n c.- There shall be no discharge of visible oil sheen, detergent-based foam, or' floating solids in other than trace amounts except in cases of i condenser leak seeking and sealing. In such cases, the use of a reasonable amount of blodegradable and nontoxic material may be used to the extent necessary to find and/or seal the condenser leak. Each month the~ permittee shall report the occasions wherein this material was used, i [

h.

Chemical discharges of hydrazine, ammonia, morpholine, boron, lithium hydroxide, hydrogen peroxide, ethylene glycol, and propylene glycol shall not be greater than 1 mg/l when present in-the A inrge. ~8- -5284R

, e-- r 5 / ( p REASONS FOR CRANGE I.v h y 4_ w. e s. A b I Flow; i

h.,

m ~. Seabrook Station was-designed end built with a once-through cooling wat' r .i e w-Esystem,1with capacity to handle' flow from two power plants. Accordingly all ) <em;ironmental asses;ments:(316a and 316b demonstrations) consideredLthe impact: r 'ofI thef-flow through the Cooling Water. System up to.two-unit _ operation.- The L-t

conclusions 'were that two-unit flow would have acceptable environmental-impact.

l k tu The.present flow limitation in the NPDES permit does not readily allow i [ ' ithe normal operation of,the Seabrook Station Cooling Water' System. The flow j 'liEit was' established for the anticipated design cooling water flow for one j + . uni t', takingDthe previous two-unit flow and cutting'it in half. However, as presented in our submittal.of November 6,1986, NYE-89056, the flow should be = -increased to 720 MGD. This value accounts for'the measured'as-built flows for-aLsingle unit within a system' capability originally designed for two unit 6 operation,nwith consideration-for. performance during high. tide. q

Hence,'this revision to increase flow to less than two-unit-flow is-sjustifiedL It will allow ' normal operation of the Seabrook Station' Circulating -

.l s Water-System and have no detrimental. environmental; impact. Foam T 1Ruf current permit states that, '"There shall be no discharge of visible --oil 1 sheen, foam,'or floating solids in other than-trace amounts...."- A modification to - the. wording to indicated detergent based foam qualifies the t Llanguage1to account for naturally occurring sea foam resulting from the circulation of seawater within the CWS. E W i _9_ 5284R i t

m.' Chemical Dischtrtes D ' As a course of normal operation, Seabrook Station discharges low concentrations of hydrazine, ammonia, morpholine, boron (as boric acid), lithium hydroxide, hydrogen peroxide, propylene Elycol, and ethylene glycol into the Circulating yater System (001). These chemicals were not identified in the original permit application, but are used as normal chemical control 4 ^ agents in any nuclear power plant. These chemicals, released from Discharge Points (022) and (025), will have concentrations of 1.0 mg/l or less following mixing within the discharge transition structure. The cencentration of chemicals at the ocean surface following discharge through the multiport diffusers would be below 0.1 mg/1. 5284R

SECONDARY PLANT LEARACE (022. 023. 024) FROPOSED VERSION Part I.A 6. During the period beginning Tunnel Activation Date and lasting through Expiration Date, the permittee is authorized to discharge irom outfall(s) serial number (s) 022 secondary plant leakage Vault #1, 023 secondary plant leakage, Vault #2, 024, secondary plant leakage, Vault #3. a. Such discharges shall be limited and monitored by the permittee as specified below: Effluent Characteristic Discharre limitations Monitorint Requirements Other Units (Specify) Measurement Sample Avr. Monthly FSx. Daily Frequency _ Type Flow - gpd Monthly Estimate Oil and Crease, 15 20 Weekly When Grab mg/l in Use Total Suspended 30 100 Weekly When Grab Solids, mg/l in Use DELETED pil LD!IT b. The samples taken in compliance with the rnonitoring requirements specified above shall be taken at a representative point prior.to mixing with any other stream. I 5284R

REASONS FOR CilANCE n!i Secondary plant leakage into the oil / water separator vaults includes leakage from equipment whose water chemistry will be maintained with a pil at or above the current permit limit of 9.0. These vaults were designed and built to separate oils from secondary plant leakage prior to discharge. No mechanism to automatically monitor and adjust the pit of the effluents were planned or installed. Because of this, the vault (s) may occcsionally be out of the allowable pil range of 6.0 to 9.0. Each vault discharges to a designated NPDES discharge stream which is monitored for pli compliance prior to its discharge to the environment. Outf all 022 discharges upstream of Outf all 001 which is monitored routinely for pit, and outf alls 023 and 024 discharge upstream of Outf all 002 which is also monitored for p!! prior to discharge to the environment.- It is, therefore, requested that the pli monitoring limitation at each oil / water separator vault be climinated from the permit. Established downstream pil monitoring locations ensure that applicable permit discharge limits are maintained, conforming to water quality standards. V 5284R

STEAM CENERATOR BLOWDOVN (025) L JROPOSED VERSION Part I.A 7. During the period beginning Ef fective Date and lasting through Expiration Date, the permittee is authorized to discharge from outfall(s) serial number (s) 025, distillate and neutralization waste f rom stese generator blowdown recovery regeneration sump. a. Such discharges shall be limited and monitored by the permittee as specified below: Effluent Characteristic Discharge Limitations Monitoring Recuirements Other Units (Specify) Measurement

• Sample Avg. Monthly Max. Daily

_ Frequency _ . Type Flow - gpd 300,000 Each Batch Estimate Oil and Grease, 15 20 Once Prior Grab mg/l to Eatch Discharge Total Suspended 30 100 Once Prior Grab Solids, mg/l to Eatch Discharge Radioactivity (SeeSubparaEraph] below) DELETED pH LIMIT b. Samples taken in compliance with the monitoring requirements specified above shall be taken at a representative point prior to mixing with any other stream. c. The concentrations of radionuclides shall not exceed those standards for such materials as appear in and are restricted by licenses from the Nuclear Regulatory Commission. When discharge is continuous to 001, the requirements shall be daily for I Flow, weekly for Oil and Grease, and weekly for Total Suspended Solids. 5284R i l

s i 4, A - Q. REASONS FOR CHANGE h h A h ~ f l y>> p q;< n 1 Steam.Cenerator Blowdown (SGBD) is' discharged to the 025 discharge line, - which ihen discharges.to the. Circulating Water System (001). There are no - listed, permit requirements-in 025 for either continuousfor batch SGBDLto: l - circulating water..The permit requirement'for 001' indicates that SGBD goes to m' . 001r.A11 other listed discharges to 001 have separate: discharge limits except k-for'SGBD. u, 'It is possible~that during plant operations as much as 280,000 gallons P per day could be blown down'from the steam generators to control chemistry-p, parameters.. In. addition, an average of.'20,000 gallons per day could be N' -released from waste test tanks connected to 025. If SGBD is considered part , of 025.. this will ~ exceed the limit of 60,000 gpd monthly average for 025. -Accordingly,'the limit on 025 should be' increased.to 300,000 gpd monthly p average.to accommodate this possibility. Currently, SGBD..is analyzed weekly es F for all 025' discharge requirements. i: y -Asterisk Footnote p During continuous blowdown of the Steam Generators, monitoring should be s conducted on a daily basis for flow.and on a weekly basis =for oil'and grease p b '" cand total suspended: solids.:rather than4 on'an each batch basis. This F li - modification would allow for a regulated sample frequency during periods of ,, extended release.. L [y r, pil p ..The value for pli should be' eliminated. Normal steam generator p!! ranges w from 8.8-9.2 units or as high as 9.6 to minimize corrosion and sludge ~*" ~ buildup. There will, however, be no environmental consequence because there p, . is a downstream monitoring point for pH, which ensures that applicable water quality standards are met. '5284R f ( o r, .a

+; o: ?

AUXILIARY COOLING TOWER BLOWDOWN (027)

,:.1,,f'1st PROPOSED VERSION-I -Part I.A-U* ' '9. During the period beginning Effective Date and lasti6g through Expiration-Date. the permittee.is authorized'to discharge from outfall(s) serial number (s) 027 auxiliary cooling" tower blowdown. a._ SuchLdischarges shall be limited and monitored.by the' permittee as 'specified below: Effluent Characteristic Discharge Limitations Monitoring Requirements Cther Units (Specify) Measurement

Sample' Avg. Monthly Max. Daily

. Frequency Type-Flow - gpd Daily

• Estimate I

' DELETED CHROMIUM AND ZINC LIMITS i i Free Available** 0.2 . 0.5 Daily

• Grab '

Chlorine', mg/l i: %n

• Sample frequency is once daily when. auxiliary; cooling tower discharges j

blowdown. s

• • None of the 126 priority pollutants -shall be used for cooling tower' maintenance.

Sodium silicate may.be utilized as an anti-scalant. b. ,The pH shall-not be less than 6.0 standard units nor greater than.9.0 standard units. l c.- -Thelsampics.taken in compliance with the monitoring requirements ,J specified above shall-be taken at a representative point prior ~to mixing-with any o'ther stream,

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,a ~ REASONS FOR CHANGE - g ( J. 7.;j '. : ^ a ,.m m" "!. ..... C. Asterisk Footnotes

The present NPDES permit

• requirement to sample the cooling tower water d-

'should be limited to those occasions when' blowdown is released'from the cooling-tower to the circulating water discharge (001).. Typically. the cooling tower l operates:in a closed cycle mode, with no blowdown to-the environment. Since'there is'no' environmental impact"when operating'inLthis. closed cycle: mode,; sampling should be limited to those times only when there is aLrelease'of blowdown to the Circulating Water System (001). The water treatment program for-the tower, at this timef~uses chlorine.- It does not include chemical. compounds of chromium or zine for maintenance of-tower water quality nor is the tower constructed of these materials. For these reasons, the NPDES permit should be modified to el'iminate reference to. chromium and zine: compounds. Sodium silicate is added to'the permit to ' reflect its.use as an anti'scalant. t -Tot'al Chromium. Total Zinc t 3 The present NPDES permit sets limitations for both total chromium and . zinc'for;the' auxiliary cooling tower.. As: originally envisioned., these chemicals.were to be~ utilized for water treatment..'Neither chromium nor zinc,- "however, will'be' utilized. Instee'< sodium silicate will be employed for scale! control. As a result, permit liwltations are no longer applicable. i

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$_O BACKFLUSHING OPERATION (003) ,h@. q4 %a 7g' PROPOSED VERSION e p Part I.A~ n I - 10.1 During the period beginning Tunnel Activation Date andilasting through Expiration Date, the per:aittee is authorized to discharge from outfall(s) f serial number (s) 003.-backflushing operation f or'biof ouling control of the Intake Water System.*

E

- a_ Such discharges shall be limited and monitored bytthe permittee as-g specified below: rf' Effluent [ Characteristic Discharge Limitations' Monitoring Recuirements l' Other Units (Specify) Measuremen t -- Sample f < Avg. Monthly. Max. - Daily Frequency Tyoe h Flow - gpm 471,000 When in Use Estimate ** ~ 3 Temperature. 'F 120 ' Continuous Average y -When in Use and Range (. S

• In the backflushing operation, the diffuser serves as the intake and:the-h

. intake structure.is the discharge point, h

• • Flow rate may be estimated from pump curves and operational hours.

L _ b., The pH shall_not be.less than 6.0. standard units,nor greater than 8.5-standard units. u c. .There shall be.no discharge _of oil, a visible oil sheen, detergent-based foam,-or floating solids iniother'than trace amounts.- 'd -TheLeontinuous backflushing flow at high: temperature (120*F' maximum)- ~.'shall'not be longer than a duration of.two hours.- The total backflushing 4 Kn cycle lmay not. exceed six hours. The thermal plume.which arises from the backflushing operatio'n shall have minimum impingement uponLthe inner and ' outer' sunk < rocks, in accordance with Paragraph"I.A.I.n(1). The permittee yL shall submit the proposed operational procedures to-the Regional ' Administrator and the-Executive Director for approval-within 30 days of

f the effective.date of this permit that will specify the weather conditions, tidal conditions, and any_other hydrodynamic factors that

+ I would ensure that the backflushing thermal plume will have minimum impact Y upon the inner and outer sunk rocks. -l ' - 5284R. ['.._ J h_._ 'A (,. f, 6 ( {- s.

LThe parmittee shall not conduct more than four backflushing cycles per 'e.- palendar year unless prior approval is obtained from the Regional ~ 'y - Administrator and; the Executive Director. f. There will be no chlorination operations during the thermal backflushing process except for safety-related functions (i.e., Service Water System chlorination). I g. The permittee sha11' include in the monthly' submittal of the Discharge Monitoring Report each time Discharge 003 is used giving the date and duration of each backflushing operation. t t 5284R

REASON TOR CHANGE + e Einw As presented within our submittal of November 6, 1989, NYE-89056; and as discussed for Outfall 001 flow, the present flow limitation was established for'the anticipated design cooling water flow for one unit, taking the previous two-unit flow and. cutting it in half. As a result, the present flow limit will be exceeded when all three pumps are in operation. This modification is therefore required to effectively perform the backflushing operation utilizing three as-built pumps. Enna The current permit states that, "There shall be no discharge of visible oil sheen, foam, or floating solids in other than trace amounts...." A modification to the wording to indicated detergent based f oam qualifies the language to account for naturally occurring sea f oam resulting f rom the circulation of seawater within the CWS. k 5284R

MW? ' ? 3~

NEW DIScHARCE - ACID Q1JJQQHC OF cilLORINATION CE1.1 R "(028) 1

.c; 3 f.0 j l,- .g-PROPOSED VERSIgf - i,,

Part I.A.

11. During;the~ period beginning Effective Date.and lasting-through Expiratica "ln,

Date, the permittee is authorized to discharge from outfall(s) serial-number (s). 028,; chemical cleaning wastes from-the acid cleaning of chlorination cells.*

Such discharges shall be limited and monitored by the permittee as -a. specified below: " Effluent Characteristic Discharge limitalinna Monitoring Recuirements. Other Units .(Specify)' Measurement! Sample Avg. Monthly Max Daily Frecuency Tvre Flow'- gpd-1,000 Each Batch Estimate -TSS-(mg/1) 30 100 Each Batch -Grab b.' -The.pH shall not be less than 6.0 standard units nor greater than 9.0. '4 ' standard units. Samples taken in compliance with the monitoring requirements specified c.- above shall be taken at a representative point prior to mixing with any ~ other stream.

• Discharge is.made directly to the Circulating Water' System (001) discharge transition structure.

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g-REASONS FOR CHANGE Acid Cleaning of Chlorine Cells At present, discharge Point 026 (chemical cleaning basin) is used to report all acid cleaning activities that are discharged to the environment. However, at the time of the permit application, it was envisioned that the flows from Point 026 would be primarily those resulting from the alkaline phosphate cleaning of ferrous plant equipment during the construction phase. L This is reflected in the effluent limitations for that discharge point. Use of the chlorination plant results in the deposition of salts f rom seawater, particularly during operation at low water temperatures. Acid cleaning, therefore, is required routinely to remove those salts from the electrolysis cells. Iron is also precipitated from the seaweter, though to a much more limited extent. The acid cleaning removes these deposits. A significant number of exceedances resulted from this effect during 1986 because reporting was from Point 026. The discharge will not contain oil or grease since the plant cells and pipework do not contain such materials, nor are they present in the cleaning or neutralizing agents. The same applies to the other 026 chemical limitations. Permit restrictions on these effluents should, therefore, not be imposed. Chlorination plant acid cleaning will be routine with specific effluent characteristics. A new discharge point is, therefore, warranted. The only permit restrictions needed are for flow, TSS, and pH. All discharges will be made directly to the Circulating Water System (001) Discharge Transition Structure. . 5284R

w Ny NPDES PERMIT PROPOSED MODIFICATIONS Section (Discharge) Page Existing Version Proposed Version Reason / Comment IA3 10 Number (s) 002. Number (s) 002*... Clarifies that 002 may (002) and secondary plant and secondary plant also contain cooling leakage.* 1eakage. tower blowdown, not just secondary plant leakage. IA3.a 10 Avg. Max. Avg. Max. Flow rate is largely (002) Mon. Daily Mon. Daily determined by rainfall, which is outside station control. Flow (mgd) 1.0 41.5 Flow (mgd) -- 41.5 IA3.e 10 Add parameter limit of Operational chemicals, will facilitate (002) 1.0 mg/l for IIydrazine, administrative control. Ammonia, Morpholine, Doron, Lithium I!ydroxide. Ilydrogen Peroxide, Ethylene Glycol, and Propylene Glycol. IA4.a 11 Avg 11eekly Redundant. Sample (021) BOD, mg/l 45 Delete frequency is weekly; TSS, mg/l 45 Delete plus

• footnote consequently, daily maximum and weekly average limits are one in the same.

Ir.clude footnote to set seasonal TSS limits. Total Residual Chlorine Total Residual Chlorine Chlorine plant (Sample Type): Grab (Sample Type): Daily operation can produce Average and Range short-term spikes; average and range better define actual chlorine output. Total Coliform, Total Coliform, Proposed units are for 11PN/100 ml Colonies /100 mi membrane filter method, which is most commonly used in state. 5284R

= i ? ' ^ ~. - m_. v }^'._.'~.+, ,.4' s s, a ,p) 2 lv. lf ^ ~ .., :: 9 . NPDES PERMIT PROPOSED MODIFICATIONS 1 ' ~ ._ r ~ Section- ~4 - (Discharge) = f. age Existine Version Prop _qsed' Version Reason / Comment .c ~ IA4.a ' 11 Total. Avg.. Avg. Avg. Avg. Redundant, same as BOD-- ' (021) Coliform,. Mon. Weekly _. Unn,. kreeki v. and TSS. (Con tinued) ~- 70 ,70-Settleable Solids Settleable Solids-Limit of detection 0.1; ml/l Ayg. Week 1v-ml/1/hr Ayg d eekly therefore, NPDES permit value.of 0.2 would allow-0.1~ Q,.2 " for averaging of daily-measurements. Change-in units from ml/1'to al/1/hr.- Application Discharge (021) is Discharge directly to-Piping not available. - presently to. settling; Browns River. basin, but company has made statement will discharge to CW System.. IAS.a 12 Avg. Max. Avg Max. (001) lion Daily Unne Daily Pumps design limit above Flow (mgd)-(594) - Flow (mgd) (720) - limit established within: permit. IAS.c 12 Foam Detergent based foam. To account for the (001) natural foaming. characteristics of seawater. 4 5284R m-,, ,,m ,,-,...~v-,.-, .....,,,.,-~,.r,,, , - - ~, ,.~.n0- ,.-,r y--- ,_.--.,.,,,,,,..m. .-.,e ., ~ -. -y - - - - ~. -.

qur" .s 's ~ NPDES PERMIT PROPOSED MODIFICATIONS Section (Discharge) Page Ex_isting Version Proposed Version Reason / Comment IAS.h 14 Add parameter limit of Operational chemicals will (001) 1.0 mg/l for Hydrazine, facilitate administrative (Centinued) Ammonia, Morpholine, control. Boron, Lithium Hydroxide, Ilydrogen Peroxide, Propylene Glycol, and Ethylene Glycol. IA6.b 15 pit not less than delete Vaults designed with no (022, 023, 6.0 nor greater than ability to neutralize; p!I 024) 9.0 standard units. is monitored downstream to ensure environmental compliance. IA7.a 16 Avg. Max. Avg. Max. Increase to include (025) Mon. Daily Mon. Daily possible increased SGBD from seawater Flow (gpd) 60,000 -- Flow (gpd) 300,000 -- leak in condenser. Measurcrient frequency Measurement frequency

• Modified measurement frequencies to account for continuous blowdown of the Steam Generator.

IA7.b 16 pII... not less than delete p!! is monitored downstream (025) 6.0 nor greater than prior to discharge to 9.0 standard units. ensure environmental compliance. . 5284R

W .9. .4 i ~ NPDES PERMIT PROPOSED MODIFICATIONS Section (Dischargel fagg Existing Version Proposed Version Reason /Ccmment IA9.a 18 Avg. Max. (027) Manz Daily Total 0.2 0.2 delete Compounds will not be Chromium utilized within the cooling eg/1** tower as originally planned. Sodium silicate may be Total 1.0 1.0 delete utilized. Zine eg/1**

• Sample frequency is
• Sample frequency is...

Unnecessarily restric't- ... when tower is in when tower dissharges tive; discharge occurs operation. blamigwn. only during blowdown, which is when testing should be done.

• • None of the 126
  • None of the 126 Water treatment program priority pollutants priority pollutants does not use chromium

... used... except used.... Sodium or zinc. Sodium silicate chromium and zinc silicate may be identified as anti-scalant utilized as an compound. anti-scalant. IA10.a 19 Avg. Max. Avg. Max. Unnm Daily Man. Rally Flow - 400,000 Flow - 471,000 Pumps design limit above gpm gpm limit established within permit. IA10.c 1= Foam. Detergent-based foam. To account for the natural foaming characteristics of seawater. 5284R

m, . z,- - -.n n; e .g -,- n;g - -,, n 4-m.; -$ +

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- a .. - r: .:r. 3 2 H . NPDES-PERMIT PROPOSED MODIFICATIONS ^ .Section

(Discharge)

Page-Existing Version = Proposed Version Reason /Comument Addition New New discharge point (028) - Create new discharge IA.11 Avg.. Max. point (028).for acid _(028)' . Mon. Daily cleaning of chlorination cells.. Presently, Flow-(gpd) .have-to transport-TSS (eg/1) 30 100' waste to chemical-cleaning basins-(026). Measurement frequency is Discharge' Point (028) to-discharge-once prior.to each directly to Discharge Transition-discharge;: sample. type Structure.(001). ~ is grab. -26. W 5284R ,.___-~m

- 0 New Hampshire Yankee February 21, 1990 ! to NYN-90044 EPA Letter to NHY, dated January 18, 1990 S E P e ( l t

vm, 1 g - UNITE] STATES ENVIRCNMENTAL PROTECTl;N AEENCY [ j l REllON I J.F. KENNEDY FEDERAL BUILDING,90STON, MASSACHUSETTS 02203 2211 j .i R i Jmmuay 18, 1990 ~ Ted C. Feigenbaum Senior ViceLPresident and Chief Operating Officer ) New Hampshire Yankee Division i Public Service Company of New 11ampshire E P.'O. Box 300-l l Seabrook, New Hampshire 03874 j L 8 Re: Seabrook Station NPDES Permit Modifications Permit No. NH 0020338 I DearLMr. Feigenbaum Your letter of November 6, 1989, has been received and reviewed j with the New Hampshire Department of Environmental Services concerning your request for modifying the referenced permit. This permit will expire on July 5, 1990. i Di sch a r_g e_ _0 013 - EPA and the State are in concurrence with you'r letter that there will be no discernible impact upon the environment by the anticipated circulating' cooling water flow rate of 720 MGD. It is-recognized that this flow rate exceeds the maximum permitted flow rate of 594 MGD although well below the maximum flow rate of 'l,187 MGD which had been approved for two-unit operation. The rationale.for this determination is presented in Attachment I. D_i s_c h a r g e s___ 0__2_2,__ _0 2 3, a nd _0 2_4 : It is agreed that the natural buffering capacity of the diluent streams (Discharges 001 and 002) for the three internal streams (Discharges 022,;023, and 024) will insure that the receiving waters will-be environmentally protected-even though the internal -streams.may exceed the pH requirements of the receiving waters. s The pH limitations for these three internal streams can be deleted without jeopardy. Further, Discharges 001 and 002 (combinations- ~ of.Various internal streams) have pH limitations that recognize -and limit the pH prior to discharge into the receiving waters. The experimental data justifying this conclusion is given in Attachment I. De t e rmi n a _t__1_ o n It has been determined that since these two modifications are of minor technical nature they will not jeopardize the environment

Y?; ~ ~ ~ yy j - r when SeabrookJStation begins-full operation. These modifications, m b therefore, will be incorporated into.the next modification or 'reissuance'ofsthe station permit. EPA regulation 40.CFR 122.62- . (a)(16) Jallows EPA to modify the existing permit in order to u accommodate this type of new information when it is presented to p the Regional Adminstrator. As a cautionary note, the existing: permit limits for Discharges 001,:022,.023,.and 024 are still in effect until the permit has g been formally modified or reissued to include these requested changes. .Should you have any questions, please contact T. E. Landry of . F this office at 617-565-3508. Sincerely, k KWl 6 EdwardLK. McSweeney, Chief Wastewater Management -Branch cc EPA Compliance, Attn Steve Silva EPA Permits Processing, Attn: Veronica Harrington NH DES, Attn George.Berlandi NH DES, Attn: Charles Thoits l ~ tr + '7 ?-

e -. 'o d o i ATTACHMENT I 1. Discharge _001. Paragraph I. A.l.m of - the ref erenced permit defines the source F documentation establishing the circulating cooling water effluent limitations. These documents established under the-worst case basis that a' flow rate 1of 1,187 MGD (at minimum flow conditions during low tide) and a discharge of 39 'F .above ambient.(at maximum' temperature discharge conditions) would not significantly impact the offshore-receiving waters. When the operational conditions for one-unit operation in the current permit were developed, the 1,187 MGD was divided in half since only one unit was to be completed or 594 MGD. Actual pump tests showed flow rates that exceeded this value. In retrospect,~the value of 594 MGD as the maximum flow rate was found to be in error for three distinctly different reasons - a. The original 2-unit flow rate was based on low flow at low tide conditions and it did not include the higher flow rate that would be' induced by the . increased Net Position Suction Head of high tides, b. With all other parameters the same, the flow rate for one unit is more than one-half of a two-unit c operation because flowing water friction within the-tunnel is reduced by more that than one-half; thereby, producing a greater flow rate for the same pumping equipment. .c. The motor / pump sets were found, during. station tests, to have a greater pumping capacity than originally designed. [ .Therefore, the combination of these three effects will produce a maximum flow rate of about 720 MGD. This value is above the permitted value of 594 MGD but well below the originally approved.value of 1,187 MGD. The heat load imposed upon the receiving waters is exactly one-half of the two-unit heat load previously evaluated and approved. Since the heat load remains unchanged, the maximum temperature of the discharge during the high flow conditions will be reduced by a factor of 594/720 or 82.5% of k the low flow discharge temperature. i i 2. D i s ch a r g e s _0,2_2_, _0 2 3__,.__a n d _ 0__2__4_. During station test operations and during review of operational

1 ~

• .1 2'-

procedures, three internal streams (Dischargen 022, 023 and 024) were found to-exceed the pH limitations imposed by the NPDES Permit limitations and the pH Water Quality values for E the receiving marine water ' environment. r-In each case,_these streams are combined with several other internal fresh water and salt water streams before being released through Discharge 001 to the Atlantic Ocean and! F o-through ' Discharge 002 to the Browns River. Both of these F streams have Water Quality pH limitations that have to be met before being released. The central question is: "Can the pH requirements for the internal streams be deleted and still insure that the human health and the aquatic community will be protected?" The objective is to take advantage of the_large buffering capacity of marine waters in the system to naturally neutralize the three streams prior to discharge from Discharges 001 and 002. The buffering capacity of the several internal streams and of salt water itself is very great. This buffering capacity was verified by 4 simple laboratory experiments. The pH of two '100 m1 samples of fresh water was changed from 6.7 pH to 11.0 and 2.0 respectively.' The pH of two 100 m1 samples of salt water were changed from 7.7 to 11.0 and 230 respectively. Salt water was then added to each of the four samples through a ' titration ~ burette recording the changing pH values. The end-results are as follows: _ Sample _ Titrant a. 100 ml fresh 0 pH u 11.0 65 ml marine resulting pH = 8.9 b. 100 ml fresh @ pH = 2.0 800 ml marine resulting pH = 6.7 Lc.- 100 ml marine @ pH = 11.0 -6,000 ml marine resulting pH = 8.5 d. 100 ml marine-9 pH = 2.0 800 ml marine resulting pH = 6.7 h Therefore, it is practicable to remove the pH limits from the three fresh water internal streams (Discharges 022, 023,-and 024) based upon these data since Discharges 001 and 002 contain salt water components and have pH limitations before release into the receiving waters. The pH of the internal-streams will be neutralized within the plant system before 3 the discharge mixes with the receiving waters. The very large salt water dilutional ratios for the discharges into the J. ocean (Discharge 001) and into the Browns River (Discharge 002) further insures rapid and complete neutralization for protection of human health and of the aquatic community. u}}