EPA is proposing to approve a State Implementation Plan (SIP) revision submitted by the State of Delaware. This SIP revision amends Delaware's regulation that establishes controls for nitrogen oxides (NOX ) emissions from industrial boilers and process heaters at petroleum refineries by including a NOX emission limit for the fluid catalytic cracking unit carbon monoxide (CO) boiler at the Delaware City Refinery and providing for a facility-wide NOx emission cap compliance alternative. This SIP revision also includes a demonstration that these amendments to the existing Delaware regulation will not interfere with the attainment or maintenance of any National Ambient Air Quality Standards (NAAQS) or any other applicable requirement of the Clean Air Act (CAA). This action is being taken under the CAA.
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