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San Joaquin Valley Air Pollution Control District District Reference No. 20210415 May 11, 2021 Page 2 found in the District's Guidance for Assessing and Mitigating Air Quality Impacts at: ittps://www.vaIleyair.orq/transportation/GAMAQ1.pdf The District offers the following comments: 1) Project Related Criteria Pollutant Emissions 1 a) Construction Emissions: Although the construction -related 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. 1 b) Health Risk Screening/Assessment There is a sensitive receptor (i.e., residential units) located west of the Project and a sensitive receptor (i.e., August Elementary School) located Northwest of the Project. The Health Risk Assessment should evaluate the risk associated with sensitive receptors in the area and mitigate any potentially significant risk to help limit emission exposure to sensitive receptors. A Health Risk Screening/Assessment identifies potential Toxic Air Contaminants (TAC's) impact on surrounding sensitive receptors such as hospitals, daycare centers, schools, work -sites, and residences. TAC's are air pollutants identified by the Office of Environmental Health Hazard Assessment/California Air Resources Board (OEHHA/CARB) that pose a present or potential hazard to human health. A common source of TACs can be attributed to diesel exhaust emitted from both mobile and stationary sources. List of TAC's identified by OEHHA/CARB can be found at: https://ww2.arb.ca.gov/resources/documents/carb-identified-toxic-air- contaminants The District recommends 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 used to identify projects which may have a significant health impact. A prioritization, using the latest approved California Air Pollution Control Officer's Association (CAPCOA) methodology, is the recommended screening method. A prioritization score