HOW TO COUNT ENGINES IN FLEET AVERAGING

 
Engine replaced with grid power for 200 or more hours  PM emission factor for engine reduced by percent of time grid power used
 
Engine using alternative fuel operated 100 or more hours per year Use PM emission factor of zero
 
Engine using alternative fuel operated 100 hours or more per year added to fleet prior to 1/1/09 Use PM emission factor of zero and enter engine twice
 
Engine with SCR system Use PM emission factor from test results
 
Engine equipped with SCR system by 1/1/2004 or, if approved by ARB, after 1/1/2004 Exempt from fleet standards but may be used in fleet calculations. Once used in fleet calculations, must remain in fleet.
 
Tier 4 engine in fleet prior to 1/1/15 Use tier 4 PM emission factor (from CARB Executive Order) and count engine twice in 2013 and 2017 calculations
 
Engine using fuel additive verified by ARB with emission reduction factor approved by ARB Use approved PM emission factor
 

ENGINES EXCLUDED FROM FLEET REQUIRMENTS

 
Engines operating only outside California or in the Outer Continental Shelf
Engines designated as emergency use only
Engines designated as low use engines
Engines used in lattice boom cranes
Second/auxiliary engines on two engine cranes
Second/auxiliary engines on privately owned street sweepers
Second/auxiliary engines on water well drill rigs
Second/auxiliary engines on two engine snow blowers