AIR EMISSIONS REGULATIONS:

Air Quality Status	Moderate nonattainment for ozone and PM (APCD includes all of Calaveras County) EPA's Nonattainment Areas
Major Source Threshold	100 tons of NOx, VOCs or PM triggers NSR
Minor Source Permitting Exemption	None
Minor Source Treatment	BACT or RACT
Emergency Generating Limits	10 tons per year

DE MINIMIS EXEMPTIONS (Must meet 1298)

The district does not have any exemptions established in its rules. Permitting officials have the authority to exempt units on a case by case basis.

MINOR SOURCE PERMITTING

BACT is required for any sources with a potential to emit 15 pounds per hour or 150 pounds per day of any criteria pollutant. 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

Units that do not trigger BACT will still have to meet RACT levels of control. No examples of RACT are available as limits are determined on a case by case basis.

The permitting process generally takes 2-3 months depending on whether there is a need for public notice.

TREATMENT OF EMERGENCY ENGINES

All emergency engines must be permitted. If an emergency engine has a potential to emit less than 10 tons per year the district will not require RACT or BACT, but will limit the hours of operation for the unit. These units can only operate during emergencies or for maintenance.