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# OAR Box 1787 Prepped by Ollie Stewart



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UNITE D STATE S ENVIRONMENTA L PROTECTIO N AGENC Y WASHINGTON , D.C
. 2046 0

MA R 3 0 199 3

OFFIC E O F AI R AN D RADIATIO N Jame s M . Lents , Ph.D
. Executiv e Offic e Sout hCoas t Ai r Qualit y Managemen t Distric t 2186 5 E . Cople yDriv e Diamond Bar , CA91765-418 2 

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. Lents : 

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I n you r lette r o f Augus t 19 , 1992 , the Sout hCoas t Ai r Qualit yDistric t request s EPAt o issu e a n interpretatio n o f th e ter m"stationaryinterna l combustio n engines " t o includ e portabl e interna l combustio n engine s an d t o exclud e thes e fro mth e definitio n o f nonroa d engine s o r vehicle s se t fort hi n sectio n 20 9 o f th e Clea n Ai r Act . W e regre t the dela yi n responding , bu t w e wante d t o respond a s adequatel ya s possibl e whic hrequire s coordinatio n betwee n severa l offices
. Th e interna l combustio n engine s a t issu e includ e portabl e electri c generators , compressor s an d othe r source s whic har e operate d i n a stationarymanner . Yo u not e tha t whil e thes e type s o f source s ar e mounte d o n wheel s o r skid s merel yt o facilitat e transpor t fro mon e locatio n t o another , theyar e intende d t o be , an d i n fac t are , operate d i n a fixe d position
. Th e Distric t i s concerne d abou t it s abilit yt o continu e t o regulat e stationaryinterna l combustio n engine s tha t ar e 5 0 horsepowe r an

d above
. Althoughw e canno t issu e a t thi s time a n interpretatio n o f th e ter m"stationaryinterna l combustio n engines " a s requested , the Distric t i s no t preempte d b ysectio n 209(e ) fro mregulating suc hsources . EP Ai s considering proposing regulation s t o defin e nonroa d engine s t o includ e al l engine s wit hpowe r outpu t belo w17 5 horsepower
. Adraf t o f th e rulemaking proposa l i s currentl ybein g reviewe d b

yth e Offic e o f Managmen t an d Budget
. An

yfina l definitio n o f "nonroad engines " promulgate d wil l conside r al l publi c comment s receive d o n the proposal
. However , State s an d loca l jurisdiction s maycontinu e t o impos e restriction s o n such source s a s stationarysource s unti l th e effectiv e dat e o f the regulations
. EP Abelieve s tha t th e preemption , i f any , wil l then appl yonl yt o thos e interna l combustio n engine s tha t ar e manufacture d afte r th e effectiv e dat e o f th e regulations
. A s yo u ar e aware , th e Clea n Ai r Ac t Amendment s o f 199 0 have give n EPAexplici t authorit yt o se t emission s standard s fo r "nonroad " engine s a s par t o f the Agency' s Titl e I I mobil e sourc e program . Se e Clea n Ai r Act , sectio n 213
. Unlik e the Sout hCoast ,

Printed on Recycled PaperP. 3

whic hha s adopte d permitting provision s covering some o f it s nonroad sources , mos t jurisdiction s d o no t regulat e nonroa d engines
. Althoughthes e source s accoun t fo r substantia l emissions , theyescap e contro l unde r eithe r Titl e I o r Titl e I I programs . T o addres s thi s omission , EP Ai s i n the proces s o f developing nation-wide , tail-pip e emission s standard s fo r man y differen t type s o f interna l combustio n engine s utilizing it s ne w authorit yunde r sectio n 213
. Fo r instance , earl ythi s year , EPA intend s t o propos e emission s standard s fo r diese l nonroa d engine s o f 5 0 horsepowe r an d above
. Thi s ne wstandard an d other s t o follo wwil l ensur e tha t emission s fro m interna l combustio n engine s i n temporarygenerators , moveabl e cranes , an d othe r nonroa d engin e application s ar e substantiall yreduce d a t the cheapes t an d mos t effectiv e poin t --a t th e time o f manufacturing
. Moreover , th e Titl e I I standard s reduc e emission s fro mal l nonroa d engine s nationwide , whethe r subjec t t o a loca l permitting programo r not . I n th e 199 0 Amendments , Congres s als o change d th e definitio n o f stationarysourc e applicabl e t o the variou s permitting provision s i n Titl e I . Specifically , i n sectio n 30 2 (z) , Congres s exclude d fro

mth e definitio n o f stationar ysourc e "thos e emission s resulting fro

ma nonroa d engin e o r nonroad vehicl e a s describe d i n sectio n 216. " A t thi s poin t i n time , EP Aha s no t full ydetermine d th e exten t t o whic hthi s languag e preclude s regulatio n o f nonroa d engine s unde r Titl e I programs . EPAmayb e proposin g unde r it s Titl e I I regulation s t o includ e al l interna l combustio n engine s unde r 17 5 horsepowe r a s nonroa d engines
. Further , EPAmayb e soliciting comments , a s par t o f th e proposal , o n whethe r t o limi t an ypreemptio n t o engine s tha t ar e subjec t t o a manufacturer' s emissio n limitatio n establishe d unde r sectio n 213
. Unde r thi s interpretation , engine s manufacture d afte r th e promulgatio n o f thes e regulation s woul d no t b e considere d exclude d a s a stationar ysourc e unti l theyar e i n fac t subjec t t o a n emissio n limitatio n establishe d unde r sectio n 213
. Thi s interpretatio n woul d avoi d a regulator yga p whic hwoul d otherwis e exis t betwee n th e perio d thes e regulation s ar e promulgate d an

d whe n al l nonroad engine s ar e covere d b yemissio n standard s establishe d unde r Titl e II . I n an ycase , th e Distric t retain s the authorit yt o impos e in

us e restriction s suc ha s limit s o n hour s o f us e o n thes e an d othe r nonroad engines
. Furthermore , thes e engine s mayb e subjec t t o Stat e regulatio n unde r sectio n 209(e)(2)
. Th e draf t proposa l als o suggest s tha t eve n wher e a n engin e i s foun d t o b e a nonroa d engin e fo r Titl e I I purpose s i n th e manufacturing stage , State s mayi n certai n circumstance s retai n authorit yt o regulat e thes e engine s a s stationarysource s in-us e wher e suc hengine s ar e i n fac t use d primaril ya s stationaryinterna l combustio n engine s (se e sectio n 111(a)(3))
. Th e Distric t mayconside r commenting o n thi s proposa l whe n i t i s published
.P. 4

Therefore , a t thi s time , w e canno t issu e an interpretation , a s yo u request , tha t th e ter m"stationar

yinterna l combustio n engines " include s portabl e engine s an d tha t thes e engine s ar e no t nonroa d engine s o r vehicle s withi n the meaning o f sectio n 209
. W e believe , however , tha t a t a minimu mthe Distric t ma

ycontinu e t o regulat e al l engine s manufacture d befor e the fina l promulgatio n o f regulation s unde r Titl e I I defining "nonroad engine. " Further , th e Distric t mayretai n authorit yt o impos e in-us e regulation s o n nonroa d engines
. Th e proposa l addressing nonroa d engine s may addres s thes e issue s mor e clearl yan d yo u ma

yconside r commenting o n th e proposa l whe n i t i s published
. I f yo u o r you r staf f hav e an yquestion s regarding thi s letter , pleas e contac t m e o r Clar a Poffenberge r o f th e Stationary Sourc e Complianc e Divisio n a t (703 ) 308-8709
. Sincerely ,

Seit z Directo r Offic e o f Ai r Qualit yPlanning

an d Standard s cc : WilliamTyndall , OGC Michae l Horowitz , OGC Davi d Solomon , AQMD , OAQP S Kell yFortin , Regio n I X Debr a Woods , OM S