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The ARB has determined that the Caterpillar 3500 Marine Engine
Emissions Upgrade Group Kit 3 meets the requirements of the
Commercial Harbor Craft (CHC) Regulation for complying with the
Tier 2 marine or equivalent emission standards while operating on
California Air Resources Board (CARB or ARB) diesel fuel.  A
vessel owner may choose to use this engine rebuild kit to comply
with ARB’s CHC Regulation Tier 2 or equivalent compliance
requirements per the California Code of Regulations title 17,
section 93118.5(e)(6)(C)(2).   

This new alternative technology has been added to the table of
alternative technologies which can be accessed at: 
http://www.arb.ca.gov/ports/marinevess/harborcraft/documents/alttech.pdf

An ARB letter acknowledging the acceptance of this new technology
can be accessed at this same website.

The CHC regulation was adopted in November 2007 and became
effective in January 2009.  Commercial harbor craft includes crew
and supply vessels, commercial fishing vessels, ferries,
excursion vessels, pilot boats, tow boats, tug boats, barges,
dredges, and work boats.  The CHC regulation requires existing
Tier 1 and earlier auxiliary and propulsion engines on in-use
ferries, excursion vessels, tugboats, towboats, crew and supply
vessels, barges, and dredges to meet United States Environmental
Protection Agency Tier 2 or Tier 3 marine engine standards in
effect at the time compliance is required.  This regulation is
part of ARB’s ongoing effort to reduce diesel particulate matter
in communities located near ports.  Additional information on the
regulation is available at the following link:

http://www.arb.ca.gov/ports/marinevess/harborcraft.htm 

Additional questions regarding the CHC regulation may be
addressed by calling Todd Sterling at 1-916-445-1034 or email
tsterlin@arb.ca.gov.