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Contact Information:
Mendocino County AQMD
306 E. Gobbi St.
Ukiah, CA 95482-5511
(707) 463-4354
Or view the Department's
Website
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Mendocino County Air Quality Management District-CALIFORNIA
DE MINIMIS EXEMPTIONS (Must Meet 1298):
There are no permitting exemptions. Units may be exempted based on the discretion of the permitting officials.
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 |
Sources that do not trigger BACT are subject to a 20% opacity limitation and 0.1 grains of PM per cubic foot.
The entire permitting process must be complete in 60 days and generally takes between 2 weeks to 30 days.
TREATMENT OF EMERGENCY ENGINES:
Emergency engines are permitted normally. These units are likely to receive an hourly operating limit between 50-100
hours per year for testing and maintenance, however there is no limit on hours of operation during actual emergencies.
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