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San JoagWn Va/by A/r Po//uf/on Confm/Olsb/c[ Paga 2 0l 9 O(stNct/3afaranca No:2023059> Ju/y>2,2023 1a) Construction Emissions The District recommends, to reduce impacts from construction-related diesel exhaust emissions, the Project should utilize the cleanest available off-road construction equipment, including the latest tier equipment. 1b) Operational Emissions Operational (ongoing) air emissions from mobile sources and stationary sources should be analyzed separately. For reference, the District's significance thresholds are identified in the District's Guidance for Assessing and Mitigating Air Quality Impacts: httos://www.valleva ir.ora/transportation/GAMAOI.odf. Recommended Mitigation Measure: At a minimum, project related impacts on air quality should be rad uc¢d to levels of significance through incorporation of design elements such as the use of cleaner Heavy Heavy-Duty (HHD) trucks and vehicles, measures that reduce Vehicle Miles Traveled (VMTs), and measures that increase energy efficiency. More information on transportation mitigation measures can be found at: httos://ww2.vallevai r.ora/media/obOoweru/clean-air-measures.odf 7c) Recommended Modal for Quantifying Alr Emissions Project-related criteria pollutant¢missions from construction and operational sources should be identified and quantified. Emissions analysis should be pertormed using the California Emission Estimator Model (CaIEEMod), which uses the most recent CARB-approved version of relevant emissions models and emission factors. CaIEEMod is available to the public and can be downloaded from the CaIEEMod website at: www.caleemod.com. 2) Nealkh RisK Scr¢¢nino/Assessment The County should evaluate the risk associated with the Project for sensitive receptors (residences, businesses, hospitals, day-care facilities, health care facilities, etc.) in the area and mitigate any potentially significant risk to help limit exposure of sensitive receptors to emissions. To determine potential health impacts on surrounding receptors (residences, businesses, hospitals, day-care facilities, health care facilities, etc.) a Prioritization and/or a Health Risk Assessment(HRA) should be pertormed for the Project. These health risk determinations should quantify and characterize potential Toxic Air Contaminants (YACs) identified by the Office of Environmental Health Hazard AssessmenVCalifornia Air Resources Board (OEH HA/CARB) that pose a present or potential hazard to human health. Health risk analyses should include all potential air emissions from the project, which