AIR EMISSIONS REGULATIONS:

Air Quality Status	Severe nonattainment for ozone EPA's Nonattainment Areas
Major Source Threshold	25 tons of NOx or VOC triggers NSR
Minor Source Permitting Exemption	2 lb/day exemption
Minor Source Treatment	BACT
Emergency Generating Limits	None

DE MINIMIS EXEMPTIONS (Must meet 1298)

Units with a potential to emit 2 pounds per day or less are exempt from permitting.

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

Engines that do not trigger BACT must meet a 20% opacity limit, but no other emission limitations have been established.

The permitting process generally takes about a month, but there is an expedite option available for a fee.

TREATMENT OF EMERGENCY ENGINES

Emergency engines are permitted normally. Permits will typically include an hourly operating limit for overall use, which means that units are not limited operation during emergencies only. CARB Air Toxic Control Measures for Stationary Compression Engines apply (see the CA state page for more information).