P. 1 

# OAR Box 1830 Prepped by Ollie Stewart



### Document

Number: 

# 194 ) IV-C-16 1 Docket Number: 

# A-87-1 1

Printed 11/13/20087:21:01 AM Sheet 194 of 232.-•»••"'••* . 

# 13 &

^ PflO* ^ o UN.TE D STATE S ENV.RONMENTA L PROTECTIO N AGENC Y WASHINGTON
. D.C
. 2045 0
MA R 1 7 1989 TH E ADMINISTRATO R Honorabl e Joh

n D . Dingel l Chairman , Subcommitte e on Oversigh t an

d Investigation s Committe e o n Energ

yan d Commerc e Hous e o f Representative s Washington , D C 2051 5 Dea r Mr . Chairman : %



# uu E BJJJLi n MA Y" 5 

### 198 9 

### EPA AIRDOCKE T Than k yo u fo r you r Decembe r 2 1 IQR R I . = •-•., * comment s o f th e Moto r Vehicl e Mannf^ f ^conveying th e o n our two Octobe r 2 7 198 8 r*n?" ufa J turer s Associatio n (MVMA ) running los s contro l an d onboar d ?aoo ? lTM ^ ^con «rnin g comment s wer e quit e extensiv e »„ S P 2 recover ^ issues . MVMA' s comment s i n thes e area s fri^ m? eXpec t t o receiv e mor e rulemaking activitie s o n tS- ^ ^ ° ther S a S w e continu e ou r i t woul d o e premat^ e t o provid e ° d'at^ d 1*1 ^i n mind ' t o eac ho f MVMA' s comment s a t thi J ?? ! *t technica l respons e lik e t o mak e a fewevent s reg a ding^RA's*Intenf 6 ^ * W ° U l d t o thre e specifi c issue s raise d b ySVMA ? W t h regar d Procedure ^ ^rS^SIorSv? 6 " 3 " ^ r6fUeUn g t6S t se t u p t o favo r Integrate d onbo^ H ° n* eptembe r 1 ' 1988 ) ar e forc e syste

mdesign ?h f in?pn ? n f Tf T an d thu s t o tr * t o i s no t t o attemp t t o for L ItJi5 h * t6S t P roced "r e change s tha t bot hsystem s achiev e a simlla^" ' bU J Cathe r t 0 ens ^ e in-use . Th e fac t tha J lifUrlnl tea ? VrTc.f emissio n cont TM l considere d for diff*r«««

- « I , procedure s ar e beinq recognitio n o f 2t a ISEL^Eft.XS!;" ' ^ ^ *TM*°^'- • i » a i n th e two approache s ?h2t e i s n^in^^T""" 9 dl «««nce s desig n ove r anothe r L/S . ° lnten t t o encourag e on e approach . lITh^ a Tlso^n^'tlll^ f ^.< * • i U " , r

other . W e hoo e thl t roTM . * nq

- 0 n e ap P roac h°"«* r the (o r eve n *»??&' & ~! S ^^USe^e^" * " U 1 aU ° »



### C/tP. 3 

# V Asecon d subjec t addresse d b yMVM Ai s the amoun t o f leadtime whic hwoul d b e provide d befor e onboar d refueling contro l woul d b e required . MVM Amaintain s tha t i t i s impossibl e t o evaluat e issue s such a s cos t effectivenes s an d safet ywithou t a specifi c leadtime proposal . I wan t t o reiterat e EPA' s commitmen t tha t an yonboar d rul e wil l provid e adequat e leadtime t o implemen t onboar d control s bot hsafel yan d effectively . A s yo u know , EPA' s draf t SNPR M doe s no t contai n a ne wleadtime estimate . Thi s i s becaus e we wan t t o hav e a bette r ide a o f the leadtime implication s o f the tes t procedur e change s an

d onboar d technolog yimprovement s discusse d i n tha t documen t befor e revising our estimate . A s we continu e the rulemaking process , EP Ahope s t o receiv e additiona l comment s o n leadtime whic hfacto r i n al l o f the newinformatio n sinc e the origina l NPRM , an

d tha t specificall ydetai l the relationshi p between , an

d sensitivit yof , vehicl e safet yan d tota l syste

m implementatio n cost s t o initia l leadtime an d a phase-i n approach . Th e third subjec t commente d on b yMVM Ai s th e feasibilit y o f running los s control s an d the safet yimplication s o f a no-ven t requirement . Contraryt o MVMA' s concerns , w e di d no t inten d tha t the potentia l running los s contro l requiremen t o r the draf t tes t procedur e woul d prohibi t manufacturer s fro m using fue l tan

k pressur e a s par t o f thei r emissio n contro l strategy . Rather , our goa l i s t o ensur e tha t an yvapo r vente d eithe r prio r t o refueling or during in-us e operatio n i s routed t o the carbo n caniste r o r engine , no t directl yt o the atmosphere . W e agre e tha t emergencie s an d extremel yatypica l condition s in-us e mus t b e considere d a s par t o f an y requirement . However , t o b e o f greates t value , running los s emission s mus t b e controlle d unde r thos e condition s typica l o f hig hozon e days , whe n contro l i s mos t critical . A s mentione d above , a s we procee d furthe r i n the rulemaking proces s w e expec t t o receiv e additiona l comment s o n the area s addresse d b yMVMA . Le t me assur e yo u tha t w e wil l ver ycarefull yconside r the point s raised b yMVM Aan d other s a s w e engag e in additiona l analysi s o n thes e issue s an d tha t the comment s receive d wil l be full yconsidere d a s w e ente r int o decision s regarding rulemaking . Sincerely , 

### William K

. Reill y Willia mK . Reill y cc : Docke t A-87-1 1 Docke t A-85-2 1 

# I