Do I need an ISR Application?
The ISR Rule applies to two categories of projects: development and transportation or transit projects. Projects that meet any of applicability criteria listed below must file an ISR Application (also known as an Air Impact Assessment (AIA) Application) with the District, unless they also meet one of the Complete Exemptions.
Any applicant that seeks to gain a final discretionary approval for a development project, or any portions thereof, which upon full build-out will include any one of the following:
- 50 residential units
- 2,000 square feet of commercial space
- 25,000 square feet of light industrial space
- 100,000 square feet of heavy industrial space
- 20,000 square feet of medical office space
- 39,000 square feet of general office space
- 9,000 square feet of educational space
- 10,000 square feet of government space
- 20,000 square feet of recreational space
- 9,000 square feet of space not identified above.
In addition, the rule contains a provision for projects on contiguous or adjacent property. This provision prohibits breaking projects in smaller pieces to avoid complying with the rule.
Transportation or Transit Projects
Any transportation or transit project where construction exhaust emissions equal or exceed two (2.0) tons of NOx or two (2.0) tons of PM10.
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ISR breaks down exemptions into two categories: Complete and Partial Exemptions.
Those projects that fall under the Complete Exemption portion of the rule do not have to file an ISR application with the District.
The following type of projects are exempt from the requirements of the ISR Rule:
- Reconstruction of any development project that is damaged or destroyed and is rebuilt to essentially the same use or intensity.
- Transportation Projects that consist solely of:
- A modification of existing roads subject to District Rule 8061 (Paved and Unpaved Roads) that is not intended to increase single occupancy vehicle capacity, or
- Transportation control measures included in a District air quality attainment plan.
A development project on a facility whose primary functions are subject to Rule 2201 (New and Modified Stationary Source Review Rule) or Rule 2010 (Permits Required).
|Example of projects whose primary functions are subject to Rule 2201 or Rule 2010*
|Aggregate Mining or Processing
||Grain Processing and Storage
|Animal Food Manufacturing
||Solid Waste Landfills
||Vegetable Oil Manufacturing
|Coatings and Graphics Arts
|Cotton Ginning Facilities
||Confined Animal Facilities
|Energy Production Plants;
Petroleum Product Transportation and Marketing Facilities
||Gas Processing and Production, Oil Exploration, Production, Processing, and Refining.
*If you think that your project's primary functions fall under this exemption, but the project type is not listed above, contact the District ISR Staff at  230-5800.
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- Development Projects
Development projects that have a mitigated baseline below 2.0 tons per year (tpy) of NOx
and 2.0 tpy of PM10 are exempt from all the emission reduction requirements of the ISR Rule (Section 6.0 and 7.0).
For example, if a project has the following emissions, they would be exempt from the emission reductions requirements of the rule and not pay any off-site fees.
|Total Mitigated Baseline
- Transportation and Transit Projects
Transportation and transit projects are exempt from the operational emission reduction requirements of the ISR Rule (Sections 6.2 and 7.1.2), but must comply with the construction emission reduction requirements.