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# OAR Box 1778 Prepped by Ollie Stewart



### Document

Number: 

# 86 ) ll-C-2 8

Docket Number: 

# A-90-0 6

Printed 10/28/20089:50:55AM

Sheet 86 of 276P. 2 

## / vji f II-C-2 8

> .A . \UNITE

D STATE S ENVIRONMENTA

L PROTECTIO

N AGENC Y iREGIO N 5 o

° VU/ ^ * 23 0 SOUTH DEARBOR

N ST . V r < ^ CHICAGO , ILLINOIS 6060 4 **• Pncrt*- S 3 Qa-s i 133 ^ REPL YT O TH E ATTENTIO N OF : Donal dF . Theiler , Directo r Burea uo f Ai r Managemen t Wisconsi nDepartmen t o f Natura l Resource s P.O . Box792 1 Madison , Wisconsi n5370 7 . , ,• . % E '-••'"' ' a A^E ^ \EL\ J ^ 

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Dea r Mr . Theiler : = - \, \y Thi s lette r i s inrespons e t o you r inquir y o f Novembe r 9 , 1987 , concernin g th e propose drenovation s o f Uni t 1 throug hUni t 5 a t th e Por t Washingto n(Ozauke e County ) powe r plan t o f Wisconsi nElectri c Powe r Compan y (WEPCO) . Th e inquir y raise da questio no f wha t th e applicabl e baselin e date s fo r th e pollutant s particulat e matte r (PM ) andsulfu r dioxid e (SO2) , andanothe r questio no f how th e provision s o f preventio nfo r significan t deterioratio n(PSD ) regulatio n appl y t o th e propose drenovations . Ou r respons e t o thes e question s i s a s follows : 1 . Baselin e Date s Fo r PM , th e baselin e dat e fo r Ozauke e Count y wa s triggere dwhe nth e PS D applicatio nfo r WEPC O t o construc t a pressurize dfluidize dbe dcombustio n (PFBC ) boile r wa s determine dt o b e complet e o nMarc h28 , 1986 . Althoug hn o PS Dpermi t wa s issue dfo r th e PFB C boile r (WEPC Owithdre w it s application) , th e applicabl e baselin e dat e remain s i nplac e becaus e n o chang e i ndat e i s authorize dunde r th e Clea nAi r Act . Sectio n169(4 ) o f th e Ac t establishe s sourc e applicatio na s th e baselin e triggerin g mechanis m anddoe s no t qualif y thi s mechanis m

b y th e late r issuanc e o f a permi t (se e 4 5 F R52717) . Th e WEPC O applicatio ndi dno t trigge r a baselin e dat e fo r SO 2 i nOzauke e County . Th e reaso nfo r thi s i s tha t th e PFB C projec t wa s intende dt o b e a mino r modification . Th e ne t emission s increas e wa s restricte dt o les s tha nth e significan t leve l du e t o a contemporaneou s decreas e o f actua l emission s provide d b y Uni t 5 andt o th e plant-wid e emission s ca p[se e 52.21(b)(14)(ii)] . 2 . Applicabilit y

o f Federa l Regulation s Th e renovation s a t th e Por t Washingto nplan t ar e extensive . The y involv e replacements , modifications , addition s a t th e generatin g plan t an dimprovement s t o plan t availability , capabilit y andhea t rate . Th e renovation s als o includ e improvement s t o th e precipitato r (Projec t No . 13711 ) anda nexpecte d4 0 percen t increas e o f emission s ove r curren t plan t capability . Thes e renovation s woul d exten dth e operatin g lif e o f th e unit s b y mor e tha n2 0 year s beyon dthei r planne dretiremen t dates .P. 3

4- a . 0 „ I

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You r lette r indicate dtha t th e renovation s constitut e a nexemp t modificatio n unde r th e Stat e regulation s [(reference : sectio n144.391(4)(b) 2 o f th e Wisconsi nstatutes)] . W e believ e tha t thes e renovation s coul db e subjec t t o th e Federa l PS Dregulation s o f 4 0 CF R52.2 1 an dth e Federa l ne w sourc e performanc e standard s (NSPS ) o f 4 0 CF RPar t 60 . Fo r PSD , th e applicabl e provision s ar e th e modificatio nprovisio no f 52.21(b)(2 ) an dit s auxiliar y definitions . Fo r NSPS , th e applicabl e provision s ar e sectio n60.14 : modificatio nan dsectio n60.15 : reconstruction . Withi nthes e provisions , exemption s ar e als o defined . Afte r a revie w

o f you r Tetter , w e fin dtha t i t lack s adequat e informatio n t o determin e whethe r th e renovation s ar e subjec t t o o r exemp t fro m th e abov e provision s o f th e Federa l regulations . Unde r th e modificatio nprovisions , fo r example , th e ne t emissio nchang e canno t b e develope dunles s th e impact s o f th e improvement s t o th e precipitato r andth e increas e i nhea t inpu t rat e ar e analyzed . Du e t o inadequat e information , w e ar e unabl e t o giv e yo ua definitiv e answe r onth e applicabilit y o f thes e federall y delegate dregulations . W e sugges t tha t th e Wisconsi nDepartmen t o f Natura l Resource s (WDNR) , i nit s rol e a s delegat e agency , obtai nth e additiona l informatio nfro m WEPC O an drevie w

i t fo r th e precedin g Federa l regulations . I f a nee dremains , WDN Ri s welcom e t o reac hu s fo r furthe r assistance . W e appreciat e th e opportunit y t o respon dt o you r inquiry . I trus t thi s respons e i s helpful . I f yo uhav e question s o nthi s letter , pleas e cal l Rizalin o Castanare s o f m y staf f a t (312 ) 886-6047 . I f you r questio nconcern s NSPS , pleas e contac t Cha e Pa ko f th e Ai r Complianc e Branc ha t (312 ) 886-6797 . Sincerel y

yours ,

feve Rothblatt , Chie f Ai r andRadiatio nBranc h(SAR-26 )P. 4

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