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District CEQA Reference No: 20200052 Page 4 of 8 Assessment (HRA) should be performed. For your convenience, the District's prioritization calculator can be found at: http:www.vallevair.org/busind/pto/emission factors/C rite ria/Toxics/Utilities/PR IORITIZATION%20RMR%202016.XLS. ii) The District recommends a refined HRA for projects that result in a prioritization score of 10 or greater. Prior to performing an HRA, it is recommended that the Project proponent contact the District to review the proposed modeling protocol. The 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 Projects that 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(a).valleyair.org; or • The District can be contacted at (559) 230-6000 for assistance; or • Visiting the Districts website (Modeling Guidance) at: http://www.valleyair.org/busind/pto/Tox Resources/AirQualityMonitoring.htm. c) 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. 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 Planning Commission Staff Report 53 PA-1900240 (SA), PA-2000014 (ER), PA-2000019 (DA) Response Letters