AIR EMISSIONS REGULATIONS:

Air Quality Status	In attainment (APCD includes all of Mariposa County) EPA's Nonattainment Areas
Major Source Threshold	250 tons of any criteria pollutant
Minor Source Permitting Exemption	Size and fuel based
Minor Source Treatment	Case-by-case
Emergency Generating Limits	None

DE MINIMIS EXEMPTIONS (Must meet 1298)

A unit smaller than 1,000 cubic inches burning diesel or gasoline or any size unit burning natural gas or liquid petroleum gas is exempt from permitting if it does not trigger the Title V threshold.

MINOR SOURCE PERMITTING

The district does not have any regulations that limit emissions. The permitting process begins with a submission of a form called an "Authority to Construct." This document would contain a description of the proposed unit, its emissions and any controls that would be used. District officials will then approve the application or make recommendations on a case-by-case basis.

TREATMENT OF EMERGENCY ENGINES

The District has no emergency generator permitting requirements listed. CARB Air Toxic Control Measures for Stationary Compression Engines (http://www.arb.ca.gov/regact/statde05/statde05.htm) typically apply (see the CA state page for more information).