NORTHERN SIERRA AIR QUALITY MANAGEMENT DISTRICT

RULE 422 - EXEMPTIONS TO RULE 421
(Adopted: September 11, 1991)

The Air Pollution Control Officer may exempt from any of the requirements of Rule 421.C. any of the following facilities or modifications:

1. Resource recovery sources burning refuse derived or biomass derived solid waste fuels,
2. sources which must switch fuels due to a lack of adequate fuel supplies, and
3. sources required to be modified as a result of Environmental Protection Agency regulations where no exemption from such regulation is available to the source. An exemption under this Rule shall not be granted unless:
   1. The applicant demonstrates that it made its best efforts to obtain sufficient emission offsets to comply with Rule 421.C. and that such efforts were unsuccessful; and
   2. The applicant has secured all available emission offsets and will continue to seek the necessary offsets and apply them when they become available.