California State Nonroad Engine Pollution Control Standards; Commercial Harbor Craft Regulations; Notice of Decision

The Environmental Protection Agency (``EPA'') is granting the California Air Resources Board (``CARB'') its request for an authorization of its amendments to its Commercial Harbor Craft regulations (``CHC Amendments''). EPA is also confirming that certain CHC amendments are within the scope of a prior EPA authorization. CARB's CHC Amendments primarily subject diesel-fueled engines on crew and supply, barge and dredge vessels to the in-use engine emission requirements of the original CHC regulations; allow CARB or EPA Tier 2 or higher tier certified off-road (``nonroad'') engines to be used as auxiliary or propulsion engines in both new and in-use CHC vessels; and clarify requirements and address certain issues that have arisen during CARB's implementation of the original CHC regulations. This decision is issued under the authority of the Clean Air Act (``CAA'' or ``Act'').