Fleet Rule for Public Agencies and Utilities - Early Implementation

This page last reviewed February 22, 2011

Early implementation is a way for an agency to delay installing best available control technology (BACT) on a portion of their fleet provided BACT is installed on the remaining vehicles early. The agency must inform the ARB of their intention on following an early implementation schedule prior to December 31, 2007. There are three early implementation options that an agency may choose to utilize as part of their compliance strategy, these are described as follows:

For Group 1 Vehicles
Group 1 vehicles are those vehicles with a heavy-duty diesel engine, model years 1960 through 1987. If an agency installs BACT on fifty (50) percent or more of the vehicles in this Group by December 31, 2007, then the agency may delay installation of BACT on the remaining vehicles in this Group. The extension would allow an agency until July 1, 2012, to bring the remaining Group 1 vehicles into compliance with the BACT requirement.

For Group 2 Vehicles
Group 2 vehicles are those vehicles with a heavy-duty diesel engine, model years 1988 through 2002. If an agency installs BACT on fifty (50) percent or more of the vehicles in this Group by December 31, 2007, then the agency may delay installation of BACT on the remaining vehicles in this Group. The extension would allow an agency until July 1, 2012, to bring the remaining Group 2 vehicles into compliance with the BACT requirement.

For Group 3 Vehicles
Group 3 vehicles are those vehicles with a heavy-duty diesel engine, model years 2003 through 2006. An agency may delay BACT installation on their vehicles in Group 3 if they install BACT on 100 percent of their Group 1 vehicles and 100 percent of their Group 2 vehicles by December 31, 2008. The delay in implementation of their Group 3 vehicles would allow an agency to bring 20 percent of their Group 3 vehicles into compliance with BACT requirements by December 31, 2009, 60 percent BACT compliance by December 31, 2011, and 100 percent BACT compliance by December 31, 2012. If an agency follows the Group 3 early implementation schedule for their fleet, the 20% BACT requirement for Group 1 and Group 2 vehicles for December 31, 2007, must still be met.

The following chart summarizes extensions for early compliance:

Model Year Group

% Early Compliance and Date

Remaining Compliance and Dates

Conditions

Group 1
(1960 - 1987)

50%
December 31, 2007

100%
July 1, 2012

Implement BACT on 50% of Group 1 engines by 12/31/07, implement BACT on remaining Group 1 engines by 7/1/12.

Group 2
(1988 - 2002)

50%
December 31, 2007

100%
July 1, 2012

Implement BACT on 50% of Group 2 engines by 12/31/07, implement BACT on remaining Group 2 engines by 7/1/12.

Group 1¹
and
Group 2¹

100 %
December 31, 2008

Group 3
20% December 31, 2009
60% December 31, 2011
100% December 31, 2012

Implement 100% BACT on Group 1 and Group 2 engines by 12/31/08, implement BACT on Group 3 engines by 12/31/09, 12/31/11 and 12/31/12. Group 1 and
Group 2 engines must meet 20% BACT BY December 31, 2007, and 100% BACT by December 31, 2008.

How To Apply
An agency may send a letter to the ARB stating that they will follow one of the early implementation schedules. The letter must be received by the ARB by December 31, 2007 for the Group 1 and Group 2 early implementation schedules. If an agency chooses to follow the Group 3 early implementation schedule, a letter must be received by the ARB by December 31, 2008. If an agency chooses to follow the Group 3 early implementation schedule, Group 1 and Group 2 vehicles must meet 20 percent BACT for the December 31, 2007 compliance deadline.

The letter must include the name of the agency, address, responsible official's name, title and signature, which early implementation schedule the agency will follow, the number of vehicles affected, a list of vehicles by vehicle identification number, for compliant vehicles, a list by vehicle identification number, engine manufacturer, engine family name, the name and date of installation of the diesel emission control strategy (DECS) used and the DECS family name.

Please address letter to:
Chief, Heavy Duty Diesel In-Use Strategies branch
P.O. Box 2815
Sacramento, California 95812



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