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# OAR Box 1132 Prepped by Candice Davis



### Document

Number: 

# 6 ) ll-C- 3 Docket Number: 

# A-86-0 3

Printed 4/18/2008 2:24:46

PM Sheet 6 of 122P. 2 

## A-U-c*'jr-c-3

UNITE D STATE S ENVIRONMENTA L PROTECTION AGENC Y WASHINGTON

, D.C . 2046

0

Mr . Joh n B . Curci o 0FF]CE0 F Chie f Executiv e office r AI RAN D RADIATIO N Mac k Trucks , inc . Executiv e Offices , Bo x M Allentown , P

A 18105-500 0 Dea r Mr . Curcio : Than k yo u fo r your lette r describing your concern s wit h meeting the 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 i n 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 the effec t o f sulfur 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 on require d engin e contro l technolog

yan d cost . Thes e analyse s wil l be compile d int o a stud yt o be 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 qualit ywil l be mad e upo n completio n o f thi s study . On e o f the 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 b e use d t o mee t the 199 1 an

d 199 4 heavy-dut ydiese l particulat e standard s on curren t fue l versu s a low-sulfu r fue l an d an yresultan t cos t differential . Vi

e hav e requeste d detaile d projection s o n thi s issu e fro

mal l o f th

e heavy-dut yengin e manufacturer s i n 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 concerning the effec t o f lo

w sulfu r fue l on 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 the 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 sulfu r control . Thus , an yadditiona l informatio n tha t Mac k Trucks , inc . coul d suppl yon thi s issu e woul d b e ver yhelpful .P. 3

Tra p plugging i s anothe r are a wher e the engin e manufacturin g industr ycoul d assis t u s in ou r study . Daimler-Ben z ha s submitte d evidenc e tha t abou t a thir d o f the non-regeneratabl e particulat e matte r foun d on a tra

p wa s sulfat e particulate . I t appear s tha t thi s non-regeneratabl e sulfat e (e.g. , a metalli c sulfat e derive d fro mwea r product s o r othe r metal s foun

d in oi l additiv e packages ) differ s fro mtha t sulfat e whic h passe s throug h the trap . I t seem s possibl e that , eve n withou t sulfur in the fuel , thes e metal s woul d combin e wit h othe r anion s an d stil l plu g th e trap . Thus , an y additiona l informatio n Mac k ha s o n the compositio n o f suc h particulat e o r on tra p plugging wit h hig h an d lo w sulfur fue l woul d b e greatl yappreciated . I n summary , we ar e pushin g ahead wit h our study , on the 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 o n the importanc e o f reducing sulfu r level s i n diese l fuel . I assur e yo u your comment s wil l receiv e carefu l consideratio n in ou r deliberatio n on thi s issue . Sincerely , J . Crai g potte r Assistan t Administrato r for Ai r an

d Radiatio n