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San Joapu/n Va//sy A/Po//✓flan Control 0lstnc[ Page 2 O/sMc[Reference No.20240694 ✓v/Y f2,2021 Other potential significant air quality impacts related to Toxic Air Contaminants (see information below under Health Risk Assessment), Ambient Air Quality Standards, may require assessments and mitigation. More information can be found in the District's Guidance for Assessing and Mitigating Air Quality Impacts at: httos�//www valleva' o /t n ortation/GAMAQI odf The District offers the following comments: 1) P o" t R 1 tad Criteria Pollutant Emi 1a) Project Related Construction Emissions Although the construction-relatetl emissions are expected to have a less than significant impact, the District suggests that the County advise project proponents - with construction-related exhaust emissions and activities resulting in less than significant impact on air quality to utilize the cleanest reasonably available off-road construction fleets and practices (i.e. eliminating unnecessary idling) to further reduce impacts from construction-related exhaust emissions and activities. 2) Health RisK Scraenina/Assessment A Health Risk Screening/Assessment identifies potential Toxic Air Contaminants (YACs) impact on surrounding sensitive receptors such as hospitals, tlaycare centers, schools,work-sites, antl residences. YACs are air pollutants identified by the Office of Environmental Health Hazard Assassment/California Air Resources Board (OEHHA/GARB) that pose a present or potential hazard to human health. A common source of YACs can be attributed to tliesel exhaust emitted from both mobile and stationary sources. List of YACs identified by OEHHA/GARB can be found at: httos-//ww2 arb ca / ources/docume t / rb=dentified-tax' - - ntaminants The District recommantls the development projects) be evaluated for potential health impacts to surrounding receptors (on-site and off-site) resulting from operational and multi-year construction TAC emissions. i) The District recommends conducting a screening analysis that includes all sources of emissions. A screening analysis is usetl to identify projects which may have a significant health impact. A prioritization, using CAPCOA's updated methodology, is the recommended screening method. A prioritization score of 10 or greater is considered to be significant and a refined Health Risk Assessment (HRA) should be performed.