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OAR Box 1850 

Prepped by Ollie Stewart 

Document Number: 

163) IV-B-08 

Docket Number: 

A-90-07 

Printed 11/18/2008 1:37:37PM Sheet 163 of 164 
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UNITED STATES ENVIRONMENTAL PROTECTION AGENCY 

ANN ARBOR. MICHIGAN 48105 

OFFICE OF 

AIR AND RADIATION 

MAY 2 6 !9M 

MEMORANDUM 

Benig n 

MAY 2 7 I994 

! !' 

SUBJECT: Evaporativ e Emission s from Motor Vehicie-sFROM: Glenn W. Passavant , Chie f %0U^Z> fccM**s*Z$^ 

EPA AIR DOCKET 

TO: 

Special Regulatory Projects Branch 

Public Docket A-90-07 

Evaporative emissions arise primarily from vehicles using high 

vapor pressure liquid fuels such as gasoline. Evaporative 

emissions are generally divided into five subgroups: hot soak, 

diurnal, running loss, refueling, and spillage. Vehicle-based 

programs to control hot soak and diurnal emissions have been 

instituted for over 15 years. However, in-use testing data show 

that these control programs need to be upgraded to capture 

emissions which occur outside of the conditions specified by the 

current test procedure and to reduce emissions from malfunctioning 

vehicles. Furthermore, at present there are no programs in place 

to control running loss, refueling, or fuel spillage emissions for 

most vehicles. Typical in-use emission rates for these subgroups 

are contained in the attached tables. 

Vehicle-based programs to upgrade hot soak and diurnal control 

and new programs for running loss, refueling and spillage control 

won't begin until 1996 or later. More detail can be found in 

public dockets A-87-11 and A-89-18. The pertinent recent final 

?ules include refueling/spillage (59 FR 16262, April 6, 1994) and 

hot soak/diurnal/running loss/spillage (58 FR 16002, March 24, 

1993). 

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