AIR EMISSIONS REGULATIONS:

Air Quality Status	Moderate nonattainment for PM and CO (APCD includes all of Imperial County) EPA's Nonattainment Areas
Major Source Threshold	100 tons of PM or CO triggers NSR
Minor Source Permitting Exemption	Less than 50 hp
Minor Source Treatment	BACT
Emergency Generating Limits	100 hours and emergencies

DE MINIMIS EXEMPTIONS (Must meet 1298)

Engines less than 50 hp 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. This guidance recommends BACT for all criteria pollutants. 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

In addition, all units must meet an opacity limit of 20% and maintain operating records.

The permitting process usually takes from 1 week to 10 days. The application fee is $108.

TREATMENT OF EMERGENCY ENGINES

All emergency engines will be permitted at 100 hours for maintenance and testing. There is no hourly operating limit, but units may only operate during emergencies