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Contact Information:
Colusa County APCD
100 Sunrise Blvd. #F
Colusa, CA 95932-3246
(530) 458-0590
Or view the Department's
Website
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Colusa County Air Pollution Control District-CALIFORNIA
DE MINIMIS EXEMPTIONS (Must Meet 1298):
Exemptions may be made on a case by case basis at the discretion of the permitting official.
MINOR SOURCE PERMITTING:
All units with a potential to emit greater than 25 pounds per day of a criteria pollutant will be required to apply
BACT. 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 |
Units that do not trigger BACT are likely to have a NOx emission limit of 640 ppm if burning natural gas and
700 ppm if burning diesel. There is also a 40% opacity limit and. In addition pipeline grade natural gas or CARB
certified diesel must be used.
The entire permitting process generally takes about 1 week, but could be longer.
TREATMENT OF EMERGENCY ENGINES:
Emergency engines are likely to be exempted operating less than 200 hours per year for maintenance and testing
and during emergencies only.
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