AIR EMISSIONS REGULATIONS:

Air Quality Status	In attainment (APCD includes all of Monterey, San Benito and Santa Cruz counties) EPA's Nonattainment Areas
Major Source Threshold	250 tons triggers PSD
Minor Source Permitting Exemption	100 hp or less
Minor Source Treatment	BACT
Emergency Generating Limits	60 hours for maintenance and testing

DE MINIMIS EXEMPTIONS (Must meet 1298)

Units smaller than 100 hp are exempt from permitting.

MINOR SOURCE PERMITTING

All sources must meet a 20% opacity limit. If a single unit has the potential to emit 25 pounds per day or more of NOx or VOCs the unit must install state BACT. Facility-wide the BACT trigger is 150 pounds per day of NOx or VOC. The air district does not have additional requirements for SO2, PM or CO. 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

The entire permitting process may take up to 180 days, but is generally completed more quickly.

TREATMENT OF EMERGENCY ENGINES

Case-by-case exemptions are available from the permitting agency. Units that are not exempted must obtain a permit. Emergency engines will generally be limited to 60 hours per year for maintenance and testing and may only operate otherwise during actual emergencies. CARB Air Toxic Control Measures for Stationary Compression Engines apply (see the CA state page for more information).