P. 1



# OAR Box 1830 Prepped by Ollie Stewart



### Document

Number: 

# 176 ) IV-C-143

Docket Number: 

# A-87-1 1

Printed 11/13/20087:21:00AM Sheet 176 of 232UNITE D STATE S ENVIRONMENTA L PROTECTIO N AGENC Y P. 2



## DE C 1 6 1988

«&

Mr * Georg e C . Mield , Presiden t 

### Automobil e Inporter a o f Aaerica , Incorporate d 172 5 Jefferso nDavi i Highway , Suit e 100 2 Arlington , VA

2220 2 

# ,__^ ° 

# ^Kx ^

# 

### .° J

~.v > Dea r Mr . Kield i
I a m writin g i nrespons e t o you r lette r date d Novembe r 2 , 198 8 regardin g variou s issue s abou t EPA' s Supplementa l Notic e o f Propose d Rulemakin g (SNPRM ) fo r refuelin g an

d evaporativ e controls . Th e thre e mai narea s abou t whic hyo u expresse d concer nwer e th e scop e o f th e SNPRM , the amoun t o f time provide d fo r revie w an d commen t o nth e SNPR M an d the issu e o f simultaneou s fina l rule s o ngasolin e volatilit y an d refueling control . Regardin g th e scop e o f th e SNPRM , yo u expresse d concer n tha t th e reproposa l i 3 to o limite d an d tha t i t doe s no t fulfil l commitnent s EP A

mad e earlier . I nthe Augus t 198 7 proposa l EP A agree d t o issu e a reproposa l whic hwoul d "asses ? change d circumstances. " Th e change d circumstance s covere d i nth e SJJPR M includ e the onboar d safet y issue , the simplifie d onboar d syste m concept , revise d onooar d coats , th e impac t o f stat e program s t o instal l Stag e II , Stag e I I costs , the mos t recen t lis t o f ozon e nonattainmen t areas , revise d tes t procedure s an d th e inclusio n o f running los s controls . Therefore , w e believ e our 3NPRK full y respond s t o previou s commitcents . O f course , you wil l be abl e t o conunen

t onthes e an

d an y othe r relevan t issue s yc u raav identify . You expresse d reservation s tha t EPA may no t allo

w fl3>ple tim e for ful l anc

i complet e publi c review an d commen t o nth e SNPRM , especiall y i nligh t o f th e revise d tes t procedures . Althoug ha fina l decisio no na tiw

e schedul e ha s no t bee nmade , w e believ e tha t a promp t schedul e for the publi c hearin g an d commen t perio d may be appropriat e becaus e we have already disseminate d th e ke y informatio nupo nwhic hth e SNPR M i s based . Ove r th e las t severa l month s w e hav e release d EPA' s revise d safet y

analysi s along wit hth e Nationa l Highwa y Transportatio nSafet y Administration' s comments , th e draf t revise d tes t procedures / th e documentatio nan d compute r code s

*U.S . GP O . 1985-46/-as -P. 3

, . •-.S?\~ , . i " UNITED STATE S ENVjROilMcMTAt. FSOTErT-n*
- * '



### fo r th e revise

d evaporativ

e emission s model * an d th e ongoin

g runnin g loss , tes t progra m results . A s a resul t of thes e actions , commenter s currentl y hav e th e substanc e o f th

e SNPR M availabl e fo

r revie w andthu s ar e able 1 

### t o beginVtbeir^analyses. ^
I nclosing t 

### yo

u state d you r concern * aboutEPA' s desir e t o simultaneousl y

promulgat e fina l rule s fo r bothgasoline v volatilit

y control s an

d onboar

d refuelin

g controls . You believ e a gasoline volatilit y fina l rul e shoul d b e promulgate

d prio r t o furthe r actiono nrefuelin

g control s becaus e th e choic e o f RV

P affect s onboar

d cost , feasibilit

y an d leadtim

e requirements . Yo

u als o believ

e that uncertaintie s about future RV P level s make it difficul t fo r manufacturer s t o comment effectivel y

o nth e propose

d ne w emissio

n tes t procedures . I n response , w

e believ

e tha t th

e interaction s whichexis t betwee n refuelin

g controls , exces s evaporativ e emissio

ncontrol s an

d runnin g los s controls , indicat e tha t simultaneou s gasolin e volatility

an d onboar

d rule s ar

e advantageou s an

d well-merited . Thi s approac hallow s u s t o tak

e a broade r an

d mor e comprehensiv

e vie w of bot hvehicl e contro l an d fue l contro l i

nth e overal l solutio

no f th e emission s problem s t o b e deal t with . Than k yo u fo

r relayin

g you r concern s about th e SNPR M t o us . Pleas e fee l free t o contac t u s agai ni f further discussio n i s necessary . Sincerelv ,

Do nR . Cla

y Actin g Assistant Administrator fo r Ai r an

d Radiatio

n
cc : Docke t A-87-1 1 Docke t A-85-2 1 T V )-..

. 1

3

' $ xy*yy$$