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San Joaquin Valley Air Pollution Control District District Reference No. 20201050 January 4, 2020 Page4 • Summary of emissions source locations, emissions rates, and emission factor calculations and methodology. More information on toxic emission factors, prioritizations and HRAs can be obtained by: • E-Mailing inquiries to: hramodeler@valleyair.org; or • Contacting the District by phone for assistance at (559) 230-6000; or • Visiting the Districts website (Modeling Guidance) at: http://www.valleyair.org/busind/pto/Tox Resources/AirQualityMonitoring.htm. 1e) Ambient Air Quality Analysis An ambient air quality analysis (AAQA) uses air dispersion modeling to determine if emissions increases from a project will cause or contribute to a violation of the ambient air quality standards. For development projects the District recommends that an AAQA be performed for the project if emissions exceed 100 pounds per day of any pollutant. If an AAQA is performed, the analysis should include emissions from both project specific permitted and non-permitted equipment and activities. The District recommends consultation with District staff to determine the appropriate model and input data to use in the analysis. Specific information for assessing significance, including screening tools and modeling guidance is available online at the District's website www.valleyair.org/ceqa. 2) District Rules and Regulation The District issues permits for many types of air pollution sources and regulates some activities not requiring permits. A project subject to District rules and regulation would reduce its impacts on air quality through compliance with regulatory requirements. In general, a regulation is a collection of rules, each of which deals with a specific topic. Here are a couple of example, Regulation II (Permits) deals with permitting emission sources and includes rules such as District permit requirements (Rule 2010), and New and Modified Stationary Source Review (Rule 2201 ). 2a) District Rules 2010 and 2201 -Air Quality Permitting for Stationary Sources Stationary Source emissions include any building, structure, facility, or installation which emits or may emit any affected pollutant directly or as a fugitive emission.