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# OAR Box 1132 Prepped by Candice Davis



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

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Mr . Henr y B . Schach t Chairma n o f

th e Boar dan d OFFICEO F Chie f Executiv e Office r AI RAN D RADIATIO

N Cummin s Engin e Co. , Inc . P.O . Box 300 5 Columbus , Indiana 47202-300 5 Dea r Mr . Schacht : Than k yo u for your lette r describin g you r concern s wit h meeting th

e 199 1 an

d 199 4 diese l particulat e standard s an d th e effec t o f fue l sulfu r conten t o n suc h compliance . Briefl y recapping our effort s in thi s are a t o date , i n Jun e o f 198 6 w e distribute d fo r commen t a preliminaryrepor t o n the effect s o f diese l fue l qualit yo n emission s an d performance . W e hav e bee n analyzing th

e comment s receive d on thi s report , an d i n additio n hav e bee n preparing mor e detaile d analyse s o f some o f the key issue s suc h a s th e effec t o f sulfu r on engin e wear , the conversio n o f sulfur dioxid e t o sulfat e in the atmospher e an d th e effec t o f sulfur conten t o n require d engin e contro l technolog

yan d cost . Thes e analyse s wil l b e compile d int o a stud yt o b e complete d nea r th e en d o f thi s year . Adecisio n t o procee d wit h a forma l rulemaking aime d a t regulating diese l fue l quali f wil l b e mad e upo n completio n o f thi s study . On e o f th

e mor e difficul t aspect s o f thi s stud yi s our evaluatio n o f th

e type s o f technologie s tha t woul d be use d t o mee t th

e 199 1 an

d 199 4 heavy-dut ydiese l particulat e standard s o n curren t fue l versu s a low-sulfu r v fue l and

- an yresultan t cos t differential . W e hav e requeste d detaile d projection s o n thi s issu e fro

mal l o f tli

e heavy-dut yengin e manufacturer s in our meeting s o n tra

p developmen t efforts . T o date , a numbe r o f manufacturer s hav e submitte d genera l statement s concernin g the effec t o f lo

w sulfu r fue l o n potentia l compliance . However , littl e detaile d informatio n supporte d b ycomplet e tes t dat a ha s bee n received . Suc h informatio n i s critica l i f EP Ai s t o accuratel yquantif yth e effec t o f diese l fue l sulfu r contro l o n th e heavy-dut ydiese l industry , an d determin e th e industry' s abilit yt o mee t th e 199 1 an

d 199 4 standard s wit h an d withou t sulfur control . Thus , an yadditiona l informatio n tha t Cummin s coul d suppl yon thi s issu e woul d b e ver yhelpful . (Cummins ' staf f agree d during a meeting in An n Arbo r o n Apri l 23rd , t o tr yt o suppl ythi s informatio n t o EP Ab yMa y14. )P. 3

W e acknowledg e the receip t o f comment s an d analyse s b

y Cummins ' showing sulfu r contro l t o b e mor e cos t effectiv e tha n exhaus t aftertreatmen t devices . However , w e ar e no t sur e wha t yo u mean b

ythes e conclusion s being "confirme d b ythe EP

Astaf f i n An n Arbor" . i f Cummin s mean s the conclusion s arrive d a t b y th e author s o f th

e preliminarystud y(Energ

yan d Resourc e Consultants , Inc.) , i t shoul d b e recognize d tha t EP Aview s tha t stud ya s preliminary , an d EP Aha s no t > ye t mad e a determinatio n engin e compliance-relate d dat a wil l pla yan importan t par t In summary , w e ar e pushing ahea d wit h our study , on th e basi s o f ou

r ow n analyse s an

d th e informatio n w e hav e receive d t o date . Than

k yo u agai n fo r providin g you r perspectiv e on th e importanc e o f reducing sulfur level s in diese l fuel . I assur e yo u your comment s wil l receiv e carefu l consideratio n in our deliberatio n o n thi s issue . Sincerely , J . Crai g Potte r Assistan t Administrato r for Ai r an

d Radiatio n