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# OAR Box 

# 1778 Prepped by Ollie Stewart



### Document

Number: 

# 83 ) ll-C-2 5 Docket Number: 

# A-90-0 6

Printed 10/28/20089:50:55AM Sheet 83 of 276P. 2

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### zj 

### I II-C-2 5

NOTE : Part s o f thi s ite m ar e no t legible .


### \>A^2. 8 P. 3 

# JT-C-zs

1

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## res - "AJ}, Mr . Arearji t S . Gil l Lnvironno^ntel/Rigulator yPlann . r Ga s Turbin e Product s Divisio n Genera l Electri c Con.] : an y On e Rive r Roa d Schenectady , Ne wYor k 1234 5 Dea r Mr . Gill : You r Octobe r 9 , 197 9 lette r t o Dou g Bel l o f EPA' s Standard s Developmen t Branch , ha s bee n forwarde d t o ou r offic e fo r response . Yo u requeste d a determinatio na s to whethe r a propose d ne

w maintenanc e progra mt'e r Rxisting ga s turbine s woul d caus e th

e turbine s to b e considere d irodifie d unde r 560.14 . Th e specia l programwoul d updat e certai nturbine s to improv e reliability , efficienc y an d output . Unde r thi s program , yo u believ

e there wil l b

e a nincreas e i

nNO xemission s whe n firin g distillat e fuel , en d a greate r decrease. ' whenfirin g natura l gas . Althoug ha nincrease d us e o f natura l ga s i s planned distillat e fue l woul d stil l b e fire d par t of th e time . You hav e raise d thre e question s concerning thi s situation , whic hare include

d wit hou

r accompanyin

g determinations : '* " ' i ) If , afte r th e update , thes e ga s turbine s ar e flref l par t o f "th e tim e onnatura l gaa an d th e remainde r o f th

e tim e o n distillat e fuel , suchtha t th e yearl y

averag e VOx en

d 6O 2 emission s d o no t increas e woul d thi s b e considered a modificationunde r 4 0 CF R60.14 ? ; Yearthi s woul d b e considered a mo

d i f icatio

nunde r $60.14 , an d the Modifie d turbine s woul d b e required t o mee t N8PS - • A ' modificationi s defined a t 560.14(a ) a s "an y physica l o

r operationa l chang e t o a nexisting facilit ywhichresult s i nan increas e i

nth e emissionrat e t

o th e atmospher e o f an y pollutan t t o whic ha atandar d applies" . Certai nexemption s are provided fo r under 560.1 4 (e ) an d (f) , but thes e ga s turbine s ar e not eligibl e fo

r an yo f thes e exenptions ._P. 4

Eve nthouoh , accor

d ir.'- * t o you r d?tc , "•.h

e turbine s wil l emi t les s over th

e cours e or . a yoar , vo u fee l ther e wil l b e increase s whendistillat e fue l is ured . linc e r«o. 1 i f icet io

nis base

d o n increase

d emissio

nrate , •->-*.(*

. enissio

nr.t e under f-fiO.14(h) , i s expressed i

nterr. s of kq/hr , an y increas e i

nemissio

nrat e durin g th e period s whendistillat e fue l i s burned , wil l requir e th e sourc e b

e considere

d r.odifie

d fo r NSP S purposes . Thi s positioni s supporte d b y a discussioni

nth e preambl e t o th e proposed provision s fo r NSP S modification , notificatio n an d reconstruction(3 9 F P 36946 , Octobe r 15 , 1974) . The preambl e states: - -"I nth e Ac t th

e phras e " Increas e i nemissions " ia no t defined an

d therefor e ca

nb e interprete

d to meanan

y incre'a^ g i

nemissions. " Shoul d there b

e subsequen t disagreemen t betweenyou r compan y an d th e Ad^lnlstrctor a s t o whethe r a nIncreas e i

n emissionrat e occurs , th e procedure s outline d under S6C.14(b ) shoul d b e used t o determine I f a clea r increas e occurs , 2 ) Doe s EP

A consider o

neithe r a d

e minimi s o

r administra tiv e necessit y

basi s tha t certai nsnai l increase s I nth e leve l o f emission s woul d not requir e tha t th e chanqe s b

e classified a s modifications ? '•! i •il

-

Ther e i

a n o specifi c d

e sr.lnlmi

s leve l o

r percen t whereb

y increase s belo

w tha t leve l woul d no t b e considered modifica tions . I f th

e Administrator determine s tha t emissionlevel s wil l increase , a modificationwil l b e deeded t o have occurred . Emissionrate s ca

nb e determined , under 560.14(b)(1 ) an d (2) , fro m eithe r Compilatio no f Ai r Pollutan t EmissionPactor a (BP A No . AP-42 ) o

r other emissio

nfactor s if the

y demonstrat e a clear increas e or decrease . If thes e factor s canno t s o demonstrate , thenmateria l balance , continuou s monito r data , o r manua l emissiontest s canb e used . Whe nth e emissionrat e ia base d o n result s fro

m manua l emissio

ntest s cr continuou s monitoring . Appendi xC (Student* 8 t test ) shal l b e used t o determin e i f a n increas e o

r decreas e ha s occurred . Thus , i nthi s instance , a modificationoccur s onl y i f th e emissionrat e afte r the chang e I s statisticall y

significantl y

highe r tha

nth e rat e befor e th

e change . 3 ) Unde r USP S an

d PST" ) (proposed) , le I t correc t tha t an y availabl e fue l suitabl e fo r us e I

noperationo f the equipmen t (aubjec t t o an

y applicabl e permi t limitation ) ma y be use d t o determin e "before " emissions , an d an y fue l wit hcharacteristic s fo r whic hth

e operator i s willin g t o accep t enforceabl e permi t condition s ma

v b e use d to determin e th

e •after " emissions ?- y f P. 5

Unde r •'; 0 **-••"
. . . n
. 1 •'

• , e- . i chanq e ar e rar.e. ! or . -.ct.:.. . 1 i ; t h e Droro
. Cv' r>rovisic-. " v: . v i'
. n vn t . £h-for o ar..' 1 aft--•""

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. - i.«r-

5 ionr*
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i t ir e fror
. —•< " r-*;..'
. iCicr.ricn-.
. (3 Ar^1'*•'•-")> o r a n c..]-***.i : taci l it-
. "-." . ",-»•. " b e a n increas e i n sidcre d d . f i n i ;*»•* * ' _ctua l
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. 1 f i o 

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. . .

. t io n • • r -

*. o ::*o

di f i r •* > t i o n ther*-* 1 "'.'-
. t ""'h e Arlri n i r

t r ato r con - t.ho t increase s i n precon - trolle r

(notentiiil ) v:" i:;_
. iu'.*.--
. • . oul' " I'- * considere dro di « " ic.i t ions
. However , th e pror'npr- '
. : v - 0i n i -

_i •: n o f

ro di f

ics t io n i n lir.ito dt o increase s i n actu.i l o r irs i on: ; i n ')*..'
. .. p in n wit hth e inten t o f * * 31 1 o f controllin g faci l itio p -.-r.l v vhe n the y cor . r-titut'
. *

_ne w sourc e o f emission"
. You r interpretatio n o f wit hroqarr . t o deterr.i n i:v * -r.-*-' / potentia l eninsionr
. C Lthe

- -.c m >.-... L (propose df " ••-*•* • tenne r

•*•• , 1P79) , *"•' • 7 1 (propose d ro di f ica t ii~riR, i s correct . Th e e w o for e th e no dificatio n shoul d b e base d o n anytvo e o f fue l tha t firina . ' e sourc e v,"* ca.Pfthl o ot "

h e re m tv'.'.-

e o : <',r

1 " refer s no t t o ?ulfu r conten t bu t t o e.c , gas , oil , coal . f'r. c ^rceabl e porr.i t condition s o n th e "typ e o f fuel " conbnctc d wil l lirr.i t th e r-oten t ..a l emission s level . Thes e condition s r-vs t i* e enforcea'.:>l e unde r th. e Clea n Ai r Act . Th e nntontia l enis_i.cn

_--fte r th o r.odi f icatio n shoul d b e deternine d o n th o ..ar c t _•.•* . is : th e dirties t tvp e o f fue l th e sourc e i s capabl e o f bur n inn . ?«oain , enforceabl e rx.rr.it . condition s o n th e typ e o r foo l co r buste d na ylimi t potentia l enis s icnj . T'h e sulfu r conten t o'* ' th o fue l use d i n th e calculatio n o f pre-r-o d I f icstlo n potentia l erir*sion s shoul d b e th o aversi e sulfu r conten t use d ove r t K e prece o in n one-to-tw o vea r perio d i f th e sourc e w<_!r . her n in c th e sar. e typ o o f fue l t o h e use d i n th e calculation . I f th e recc e ha d bee n burnin g a differen t typ e o f fuel , th e sulfu r conten t t o b e use d i n th e calculatio n shal l b e base d o n th e mos t strinoen t o f th e applicabl e PIP , an y applicabl e NSPS , an yFi r perrit , o r an yothe r enforceabl e requirement . To r instance , er.suo. e tha t a sourc e i s capabl e o f burnln a eithe r oi l o r coal . Fo r th e pas t tw o year s I t ha s b<?en burnin g oi l wit h c sulfu r conten t o f ?%, Th e applicabl e SI T specifie s a 2 % sulfu r Uni t fo r bot h oi l an d coal . Th e sourc e no w want s t o adop t enforceabl e perri t condition s whic h woul d llri t I t t o burnin g oil . Th e source' s pre-modificatio n potentia l emission s ma yb e base d o n th e dirties t fue l tha t coul d b e acconnodated : coal . Pecacs e th e sourc e ha s no t burne d coa l ove r th e n?-* t tw o years , th e sulfu r conten t user " i n th e calculatio n Fhal l b o th e applicabl e SI P limitation : 2 » .P. 6

» •

Th e source' s post-modificatio n en ission s "a ybe base d o

n oi l burninq , assunin o the t th e sourc e ha s agree d t o pern.i t condition s enforceabl e unc or th o ("lea n Ai r Act . "h e sulfur conten t ui>e

d t o calculat e potentia l omission s i s the nomina l sulfu r conten t the sourc e actoall v plan s t o use . I f yo u hav e an

yquestion s concernin o the MSP S aspect s o f thi s no d ificatio n issue , pleas e contac t Pober t Myer s o f n v staf f a t (202 ) 75T-.-2564 . Shoul d yo u hav e an yquestion s relatin g t o the PS D aspect , pleas e contac t Libb ySconin o a t the san e number .



# ,C ^dwar d ?.. ^oic h cc : Doug Bell , SD B Regiona l HSP S Contact s Regiona l PS C Contact s
FN:BMyers:ncb:3202:l 2/6/7 9