Permit to Construct Exemptions
The Rules for the Control of Air Pollution in Idaho (IDAPA 58.01.01.220–223) allow owners or operators to exempt certain sources from the requirement to obtain a permit to construct (PTC). The resources below are provided to help facilities prepare and maintain their exemption documentation in support of a PTC exemption.
Note: PTC exemption does not release the emissions unit from compliance with all other applicable federal (for example, NSPS, Tier I operating permit), state, or local laws, regulations, permits, or ordinances.
The purpose of Form EXPT is to assist facilities in preparing and maintaining documentation for the equipment or activity for which a PTC exemption is desired. This form may be used to document a self-exemption analysis or may be submitted to DEQ for an exemption concurrence (at no cost to the applicant).
Note: For existing sources of air emissions, removal of equipment that generates air emissions cannot be used to offset the increase in air emissions for the equipment or activity for which a PTC exemption is desired.
Additional Note: A PTC exemption does not release the owner or operator of sources of air emissions from compliance with all other applicable federal, state, or local laws, regulations, permits, or ordinances.
Petroleum-Contaminated Media Exemptions
Petroleum remediation projects using soil vapor extraction or air stripping remove petroleum contamination from the ground and ground water. Petroleum contamination can interfere with beneficial uses of a contaminated site, of adjacent properties (subject to contaminant plume migration), and of the ground water. Therefore, it is imperative to begin remediation as soon as possible to limit the amount and extent of the contamination.
DEQ has developed the guidance below regarding these types of petroleum remediation projects that are specifically exempted from air permitting requirements. This guidance is designed to facilitate the rapid remediation of petroleum contaminated sites and addresses the air quality permitting/exemption requirements of IDAPA 58.01.01.222.02.j, as well as the state requirements of the Underground Storage Tank/Leaking Underground Storage Tank program. Remediation projects that do not meet the air pollution requirements of this guidance must either self-exempt in accordance with the Rules for the Control of Air Pollution in Idaho (IDAPA 58.01.01) or obtain a permit to construct.
- Guidance for Remediation of Petroleum Contaminated Media
Includes volatile organic compound (VOC) emissions calculation and exemption forms for projects using soil vapor extraction or air stripping to remove petroleum contamination from the ground and ground water.