p. 1



# OAR Box 

# 1778 Prepped byOllie Stewart



### Document

Number: 

# 82 ) ll-C-2 4 Docket Number: 

# A-90-0 6

Printed 10/28/20089:50:55AM

Sheet 82 of 276

# m 

# iyw P. 2



### •...-> « ^ II-C-2 4 r?f?7 j •-•\-ir.::j-::AT;3E:\--'i3C'.:.

- = :.:•-•- . ;- . ../ ' •-' Offic e o f Ai r Qualit yPlannin g an dStandard s Researc hTriangl e Park , Nort hCarolin a 2771 1



## SE P 

## 1 3 197

8

Mr . Thoma s H . Rhoad s - J 

### EnviroriiTienta I Ccriservatic n..snagc r Exxo nChemica l Company 133 3 Wes t Loo p Sout h Houston , Texa s 7702 7 Dea r Mr . Rhoads : Thi s lette r wil l confir mth e majo r point s covere di nou r Augus t 29 , 1973 , discussio ni nDurham , Nort hCarolina , concernin g th e applicatio n o f th e modification/reconstructio nprovision s o f Par t 60 , 4 0 CFR , t o stationar yga s turbines . A nexistin g stationar yga s turbin e wil l onl yb e considere da modifie dsourc e subjec t t o complianc e wit hstandard s o f performanc e i f emission s o f N O increas e a s a resul t o f som e physica l change , o r chang e i nmetho do £ operation . Thus , a s lon g a s emission s o f N O i n term s o f pound s pe r hou r d o no t increase , a stationar yga s turbin e wil l no t b e considere dmodified . Combustio no f a nalternativ e fue l wil l no t b e considere da modification , eve ni f i t result s i nincrease demission s o f NO , i nthos e case s wher e th e ga s turbin e wa s originall ydesigne dwit hth e capabilit yt o fir e thi s alternativ e fuel . Base do nth e preliminar yinformatio nyo u presente d concernin g som e o f you r ga s turbine s a t Exxon' s Bato nRoug e refinery , i t woul dappea r tha t thes e ga s turbine s wer e originall ydesigne dt o fir e eithe r gaseou s o r liqui dfuels . I f thi s i s th e case , the nswitchin g fro mfirin g ga s t o firin g oi l woul dno t b e a modification . Whethe r switchin g fue l i nthes e ga s turbine s woul do r woul dno t constitut e a modification , however , assumin g emission s o f N O increase da s a resul t o f th e fue l switch , wil l requir e submissio no f a forma l reques t fo r suc ha determinatio nt o th e EP ARegio nV I office s i nDallas , Texas . Thi s submissio nshoul dinclud e dat a an dinformatio noutlinin g th e desig ncapabilit yo f thes e ga s turbine s t o bur nliqui dfuels , an dth e natur e andorde r o f magnitud e estimate s o f th e cos t associate dwit hanyalteration s necessar yt o fir e liqui dfuel s i neac ho f thes e turbines .P. 3

-2

- Achang e i n ownershi p o f anexistin g ga s turbin e wil l no t resul t i n tha t ga s turbin e bein g considere d a ne wsourc e subjec t t o standard s o f performance . A

n existin g stationar yga s turbin e i s an yga s turbin e tha t ha d bee npurchased , o r fo r whic ha nowne r o r operato r ha d entere d int o a bindin g contractua l obligatio nt o purchase , fro ma ga s turbin e manufacture r o r vendo r o no r befor e Octobe r 3 , 1977 . Anexistin g stationar yga s turbin e wil l onl yb e considere d a recon structe d ga s turbin e subjec t t o complianc e wit hstandard s o f performance , i f th e tota l cos t o f th e alteration s mad e t o a ga s turbin e excee d 5 0 percen t o f th e tota l installe d cos t o f a ne wga s turbin e o f equivalen t capacity , .an d i t i s technicall yand economicall yfeasibl e fo r thi s turbin e t o compl y wit hth e standards . Whethe r emission s o f N O increase , decrease , o r remai n tn e sam e i s o f n o concer nwit hregar d t o reconstruction . I nthos e case s wher e th e 5 0 pe-rcfen t criteri a i s exceeded , determinatio no f whethe r o r no t i t i s technicall yand economicall yfeasibl e fo r a ga s turbin e t o mee t standard s o f performanc e wil l requir e submissio no f a forma l reques t fo r suc ha determinatio nt o th e EP ARegiona l Office . Thi s reques t shoul d includ e informatio naopropriat e t o makin g thi s determination , suc has : th e natur e an d orde r o f magnitud e estimate s o f th e cos t associate d wit h th e alteration s bein g mac e t o th e turbine ; orde r o f magnitud e estimate s o f th e tota l installe d cos t fo r a ne wga s turbin e o f equivalen t capacity ; discussio no f emissio ncontro l technolog yavailabl e t o reduc e N O emission s t o mee t th e standard , suc ha s lo wN O combustor s and/o r wate r o r stea m injection ; an d th e cos t associate d w^t hth e us e o f thi s emissio ncontro l technology . I hop e thi s lette r respond s t o som e o f you r concern s an d clarifie s th e applicatio n o f th e modification/reconstructio nregulation s t o stationar y ga s turbines . I f yo u hav e an yothe r question s o r woul d lik e t o discus s thi s subjec t further , pleas e d o no t hesitat e t o contac t m e a t (919 ) 541-5477 . Respectfull yyours ,

Fre d L . Porte r Chie f Regulation s Preparatio nSectio n
cc : Mr . R . E . Ruckstuhl , Exxo nChemica l Company u*Wr r Ric hBiondi , Divisio no f Stationar ySourc e Enforcemen t (EN-341 ) Mr . Howar d Bergman , Director , Enforcemen t Division , Regio nV I