Transcript Study of the Potential Impacts of Exempting Motor Vehicles

Reconsidered EPA Boiler
MACT / GACT Rules
Steve Schliesser
Engineer, Planning Section
Division of Air Quality
Feb 19, 2013 - Outside Involvement Committee Meeting
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Reconsidered Boiler MACT for Major Sources –
Key Changes and Highlights
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21 Boiler / Fuel subcategories for units > 10 million Btu/hr heat input
- New subcategories for light (#1, 2) and heavy (#4 - 6) oils along with
wet and dry biomass fuels
Higher PM emission limits for each fuel oil / biomass subcategory
Higher CO emission limits based on new data showing variability.
Lower emission limits for other pollutants / subcategories
Gas fired units subject to annual tune-ups but no emission limits
All affected units subject to one-time energy assessment
Nearly all NC affected facilities covering ~1,000 boilers have 112(j)
permits shielding Boiler MACT compliance up to May 20, 2019
Existing units Boiler MACT compliance date:
- with 112(j) permit = May 2019; without it = January 2016
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Reconsidered Boiler GACT for Area Sources –
Key Changes and Highlights
Initial notification due January 20, 2014
 Initial tune-up and energy assessment compliance date
extended 2 years to March 21, 2014
- ISO 50001 energy assessment considered equivalent
 Existing dual-fuel units switching from gas to coal,
biomass or oil now considered ‘existing’ units
 Tune-ups every 5 years, instead of every 2, for seasonal,
limited use, small oil-fired, and boilers with oxygen trim
 No PM limits for new boilers with < 0.5% sulfur oil
 Higher mercury and CO emission limits for coal boilers
 Clearer, broader definition of biomass fuels
and energy assessment requirements
 Gas fired units not subject to tune-ups or emission limits
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