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San Joaquin Valley Air Pollution Control District Page 4 <br /> District Reference No. 20210763 <br /> August 31, 2021 <br /> review the proposed modeling protocol. A development project would be <br /> considered to have a significant health risk if the HRA demonstrates that the <br /> project related health impacts would exceed the Districts significance <br /> threshold of 20 in a million for carcinogenic risk and 1.0 for the Acute and <br /> Chronic Hazard Indices, and would trigger all feasible mitigation <br /> measures. The District recommends that development projects which result <br /> in a significant health risk not be approved. <br /> For HRA submittals, please provide the following information electronically to the <br /> District for review: <br /> • HRA AERMOD model files <br /> • HARP2 files <br /> • Summary of emissions source locations, emissions rates, and emission <br /> factor calculations and methodology. <br /> More information on toxic emission factors, prioritizations and HRAs can be <br /> obtained by: <br /> • E-Mailing inquiries to: hramodeler(a valleyair.org; or <br /> • Contacting the District by phone for assistance at (559) 230-6000; or <br /> • Visiting the Districts website (Modeling Guidance) at: <br /> http://www.vallevair.org/busind/pto/Tox Resources/AirQualityMonitoring.htm. <br /> 1f) Ambient Air Quality Analysis <br /> An ambient air quality analysis (AAAA) uses air dispersion modeling to determine <br /> if emissions increases from a project will cause or contribute to a violation of the <br /> ambient air quality standards. For development projects the District recommends <br /> that an AAQA be performed for the project if emissions exceed 100 pounds per <br /> day of any pollutant. <br /> If an AAQA is performed, the analysis should include emissions from both project <br /> specific permitted and non-permitted equipment and activities. The District <br /> recommends consultation with District staff to determine the appropriate model <br /> and input data to use in the analysis. <br /> Specific information for assessing significance, including screening tools and <br /> modeling guidance is available online at the District's website <br /> www.vallevair.org/cega. <br />