AIR EMISSIONS REGULATIONS:

Air Quality Status	Severe nonattainment for ozone (AQMD includes all of El Dorado County) EPA's Nonattainment Areas
Major Source Threshold	25 tons of NOx or VOC triggers NSR
Minor Source Permitting Exemption	Less than 50 hp or 3 MMBtu/hr or 2 lb/day
Minor Source Treatment	BACT, PM and opacity
Emergency Generating Limits	50 hours for maintenance and testing

DE MINIMIS EXEMPTIONS (Must meet 1298)

Engines less than 50 hp, turbines less than 3 MMBtu/hr and sources with uncontrolled emissions less than 2 lb/day of all pollutants are exempted from permitting.

MINOR SOURCE PERMITTING

Sources with potential to emit greater than the following are subject to district BACT:

Pollutant	Potential to Emit (lb/day)
CO	550
NOx	10
PM-10	80
VOC	10
SOx	80

The air district is likely to follow 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

Alternately, the air district may consider BACT used in the SCAQMD.

All units, regardless of size, must meet a 20% opacity limit and a PM limit of 0.1 grains per cubic foot.

The entire permitting process could take up to 180 days, but the district is currently backlogged so it could take the full 180 days or more.

TREATMENT OF EMERGENCY ENGINES

Emergency engines must be permitted. Generally, these units will be limited to 50 hours for maintenance and testing and can only operate otherwise, during emergencies. Additional hourly limitations may apply on a case-by-case basis.