AIR EMISSIONS REGULATIONS:

Air Quality Status	Severe nonattainment for ozone (The APCD is all of Placer County) EPA's Nonattainment Areas
Major Source Threshold	25 tons of NOx or VOC triggers NSR
Minor Source Permitting Exemption	Size based
Minor Source Treatment	BACT
Emergency Generating Limits	100 hours for maintenance

DE MINIMIS EXEMPTIONS (Must meet 1298)

Engines less than 50 hp or turbines less than 3 MMBtu/hr or any unit smaller than 1 MMBtu/hr and burning natural gas or liquid petroleum gas are exempt from permitting.

MINOR SOURCE PERMITTING

Units with a potential to emit 10 pounds per day of VOC or NOx, 550 pounds per day of CO or 80 pounds per day of PM10 and SOx triggers BACT. The air district will basically follow CARB's recommended guidance. 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, the district requires emission offsets which are triggered if a source has potential to emit greater than 7,500 pounds per quarter of NOx, VOCs or PM.

The permitting process is supposed to be completed within 180 days, but sometimes may take longer.

TREATMENT OF EMERGENCY ENGINES

Emergency engines must be permitted. The permit will include a limit of 100 hours for maintenance and testing, but no hourly restriction on emergency use. These units may only operate during emergencies and no offsets are required.