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Contact Information:
South Coast AQMD
21865 E. Copley Dr.
Diamond Bar, CA 91765-4182
(909) 396-2000
Or view the Department's
Website
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South Coast Air Quality Management District-CALIFORNIA
DE MINIMIS EXEMPTIONS (Must Meet 1298):
Single engines less than 100 hp or multiple engines totaling less than 500 hp are exempted from permitting. However,
if several units are used for one purpose simultaneously they will be permitted as one. Turbines less than 3 MMBtu/hr
and external combustion units less than 5 MMBtu/hr and firing natural gas, liquid petroleum gas or a combination
are also exempted.
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
district 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 with potential emissions of 120 pounds per day or greater are required to complete air quality modeling.
No limitations will be imposed on sources with potential emissions less than 25 pounds per day.
Permitting generally takes 60-90 days, but can take 120 days or more if a public comment period is required.
TREATMENT OF EMERGENCY ENGINES:
Emergency engines are exempt from permitting if they are operate less than 200 hour per year. These units must
keep records and can only operate during emergencies and maintenance. The district is in the process of changing
to a more stringent rule.
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