Retrofit/Rebuild Requirements for 1993 and Earlier Model Year Urban Buses; Public Review of an Application for Certification of Equipment

Résumé

The Agency has received an application for certification of urban bus retrofit/rebuild equipment, and it is available for public review and comment. Engelhard Corporation has applied for certification of equipment applicable to both 2-stroke and 4-stroke engines used in urban buses for all model years up to and including 1993. The application states that the candidate equipment provides a 25 percent or greater reduction in emissions of particulate matter (PM) for petroleum fueled diesel engines relative to an original engine configuration with no after treatment devices installed. A 25 percent reduction is also claimed for engines that have been retrofit/rebuilt with certified new rebuild kits that do not include after treatment devices. The application states that this equipment will be offered to all parties for $2,000 or less (in 1992 dollars). The application would apply to all urban bus operators nationwide that are subject to the urban bus rebuild/retrofit program. The date of this notice initiates a 45 day period during which EPA will accept written comments relevant to the potential certification of the equipment included in this application. Comments should be provided in