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San✓oe0u/n Va//ey A/r Po//u Hon ConM1v/O/aMct Page 3 Ofablet/iafa/anca No.202f089f Ju/Y>2,202f For your convenience, the District's prioritization calculator can be found at: htto�www.valleva'r.ora/busind/oto/emission factors/Criteria/Toxics/Utilities/PRIO RITIZATION%20RMR%20201 6.XLS. ii) The District recommends a refined HRA for development projects that result in a prioritization score of 10 or greater. Priorto performing an HRA, it is recommended that development project applicants contact the District to review the proposed modeling protocol. A development project would be consitlered to have a significant health risk if the HRA demonstrates that the project related health impacts woultl exceed the Districts significance threshold of 20 in a million for carcinogenic risk and t.O 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: hramodaler(rDvallevair.ora: or The District can be contacted at (559) 230-6000 for assistance; or • Visiting the Districts website (Modeling Guidance) at: htto-//www vallevair ora/bus' d/ t lTox Resources/AirQual'tvM 't htm 3) 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 AAAA be pertormed for the Project if emissions exceed 100 pounds per day of any pollutant. If an AAOA is pertormed, 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.