AIR EMISSIONS REGULATIONS:

Air Quality Status	In attainment (AQMD includes the Northern portion of San Bernardino County and the eastern portion of Riverside County) EPA's Nonattainment Areas
Major Source Threshold	250 tons triggers PSD
Minor Source Permitting Exemption	Less than 100 hp or 3 MMBtu/hr
Minor Source Treatment	BACT
Emergency Generating Limits	None

DE MINIMIS EXEMPTIONS (Must meet 1298)

Engines less than 100 hp and turbines less than 3 MMBtu/hr are exempt from permitting.

MINOR SOURCE PERMITTING

The air district requires BACT for sources that have a potential to emit 25 pounds per day of a criteria pollutant. Officials will consider CARB's guidance for BACT, but will complete their own analysis based on a world-wide search of 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 less than 25 pounds per day of all criteria pollutants may receive limits based on the permitting official's discretion.

The permitting process can take up to 180 days. A public comment period of 30 days is required.

TREATMENT OF EMERGENCY ENGINES

Emergency engines must obtain a minor source permit. There is no special treatment for these units.