TUOLUMNE COUNTY AIR POLLUTION CONTROL DISTRICT
RULE 422 - EXEMPTIONS TO RULE 421
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: