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San Joaquin Valley Air Pollution Control District District Reference No. 20210415 May 11, 2021 oI 10 or greater is considered to be significant and a refined Health Risk Assessment (HRA) should be performed. For your convenience, the District's prioritization calculator can be found at: http:www.valleyair.org/busind/pto/emission facto rs/Crite ria/Toxics/Utilities/P RIORITI7ATION%20RMR%202016.XLS. The District recommends a refined HRA for development projects that result in a prioritization score of 10 or greater. Prior to performing an HRA, it is recommended that development project applicants contact the District to review the proposed modeling protocol. A development project would be considered to have a significant health risk if the HRA demonstrates that the project related health impacts would exceed the Districts significance threshold of 20 in a million for carcinogenic risk and 1.0 for the Acute and Chronic Hazard Indices, and would trigger all feasible mitigation measures. The District recommends that development projects which result in a significant health risk not be approved. For HRA submittals, please provide the following information electronically to the District for review: • HRA AERMOD model files • HARP2 files • 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. 1c) Ambient Air Quality Analysis An ambient air quality analysis (AAAA) 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.