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Contact Information:
Butte County AQMD
2525 Dominic Drive, Suite J
Chico, CA 95928-7184
(530) 891-2882
Or view the Department's
Website
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Butte County-CALIFORNIA
DE MINIMIS EXEMPTIONS (Must Meet 1298):
Engines less than 250 hp and operating less than 200 hours per year (excluding diesel) or less than 50 hp are exempt
from permitting.
MINOR SOURCE PERMITTING:
All units with a potential to emit greater than the following are required to do BACT:
| Pollutant |
Potential to Emit (lb/day) |
| CO |
137 |
| NOx |
50 |
| PM-10 |
80 |
| VOC |
50 |
| SOx |
80 |
The air district follows CARB's
guidance for permitting of electric generating technologies. Sample BACT for control of NOx from
turbines and internal combustion engines is as follows:
| Size of Unit |
Level of Control (ppm) |
| >3 MW |
9 |
| 3-12 MW simple cycle |
2.5 |
| 3-12 MW combined cycle |
5 |
| 12-50 MW simple cycle |
2.5 |
| 12-50 MW combined cycle |
5 |
| IC Engines |
9 |
There is also a toxics requirement. Under this requirement sources are subject to a site specific evaluation
of potential adverse health effects to determine whether or not a permit can be issued. Units that do not trigger
BACT will have a 0.02% fuel sulfur limit and a 40% opacity limit. No additional controls will be required.
TREATMENT OF EMERGENCY ENGINES:
Emergency engines will receive a permit that limits them to operate only during emergencies and maintenance. An
hourly limit for maintenance will be based on safety risks and the unit's potential to emit and it will generally
be between 50-200 hours per year.
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