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# OAR Box 1850 Prepped byOllie Stewart



### Document

Number: 

# 163 ) IV-B-0 8 Docket Number: 

# A-90-0 7

Printed 11/18/20081:37:37PM

Sheet 163 of 164P.2
UNITE D STATE S ENVIRONMENTA LPROTECTIO N AGENC Y AN N ARBOR . MICHIGA N 4810 5 OFFIC E O F AI R AN D RADIATIO N 

## MA Y

## 2 6 !9 M

MEMORANDU M 

# Benig n MA Y2 7 I994 ! ! '
SUBJECT : Evaporativ eEmission s fro mMoto r Vehicie-s
FROM : Glen nW. Passavant , Chie f %0U^Z> fccM**s*Z$^



### EP AAI R DOCKE T

TO : Specia l Regulator yProject s Branc h

Publi c Docke t A-90-0 7 Evaporativ e emission s aris e primaril yfro mvehicle s usin g hig h vapo r pressur e liqui dfuel s suc ha s gasoline . Evaporativ e emission s ar e generall ydivide dint o fiv e subgroups : ho t soak , diurnal , runnin g loss , refueling , an dspillage . Vehicle-base d program s t o contro l ho t soa k an ddiurna l emission s hav e bee n institute dfo r ove r 1 5 years . However , in-us e testin g dat a sho w tha t thes e contro l program s nee dt o b e upgrade dt o captur e emission s whic hoccu r outsid e o f th e condition s specifie dbyth e curren t tes t procedur e an dt o reduc e emission s fro mmalfunctionin g vehicles . Furthermore , a t presen t ther e ar e n o program s i nplac e t o contro l runnin g loss , refueling , o r fue l spillag e emission s fo r mos t vehicles . Typica l in-us e emissio nrate s fo r thes e subgroup s ar e containe di nth e attache dtables . Vehicle-base dprogram s t o upgrad e ho t soa k an ddiurna l contro l an dne wprogram s fo r runnin g loss , refuelin g an dspillag e contro l won' t begi nunti l 199 6 o r later . Mor e detai l ca nb e foun di n publi c docket s A-87-1 1 an dA-89-18 . Th e pertinen t recen t fina l ?ule s includ e refueling/spillag e (5 9 F R16262 , Apri l 6 , 1994 ) an d ho t soak/diurnal/runnin g loss/spillag e (5 8 F R16002 , Marc h24 , 1993) . Attachment s(D<O(0(OlD'O(D(DtDCO(O(O(0tO(0(O(0(0(OlD(D(D(D(0( 0 *N|S»S^>l>4>J'^0>CD0D(90D000»0DCDa>(O(O(O(O(O< O -^i\3co^uia>^oocoo-^i\3co^uia>*-^<»(oo--^rv-tco^(j i

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