Retrofit/Rebuild Requirements for 1993 and Earlier Model Year Urban Buses; Approval of a Notification of Intent to Certify Equipment

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The Agency received a notification of intent to certify equipment signed March 11, 1997 from Nelson Industries, Inc., Nelson Division (Nelson) with principal place of business at 1801 Highway 51 West, P.O. Box 428, Stoughton, WI, 53589 for certification of urban bus retrofit/rebuild equipment pursuant to 40 CFR 85.1401 through 85.1415. The equipment is applicable to petroleum-fueled Detroit Diesel Corporation (DDC) two-stroke/cycle engines originally installed in urban buses from model year 1979 to model year 1993, excluding the DDC 6L71TA 1990 model year engines, all alcohol fueled engines, and models which were manufactured with particulate trap devices. In addition, the equipment is applicable to engines which have been previously rebuilt using the certified DDC 6V92TA MUI or DDECII upgrade kits. 1 On July 11, 1997, EPA published a notice in the Federal Register that the notification had been received and made the notification available for public review and comment for a period of 45-days (62 FR 37228). EPA received no comments in response to that Federal Register notice. Subsequently, EPA has completed its review of this notification, and the Director of the Engine Programs an