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San Joaquin Valley Air Pollution Control District Page 2 District Reference No.20211108 November Z 2021 1 a) Construction Emissions Project construction air emissions are short-term emissions generated from construction activities and are not expected to exceed the District's significance thresholds. However, the District recommends, to further lessen air quality impacts from construction-related diesel exhaust emissions, the County consider incorporating the below measure into the Project. Recommended Measure: To reduce impacts from construction-related diesel exhaust emissions, the Project should utilize clean off-road construction equipment, including the latest tier equipment as feasible. 2) Health Risk Screening/Assessment The County should evaluate the risk associated with the Project on sensitive receptors (residences, businesses, hospitals, day-care facilities, health care facilities, etc.) in the area and mitigate any potentially significant risk to help limit emission exposure to sensitive receptors.- To determine potential health impacts on surrounding sensitive receptors a Prioritization and/or a Health Risk Assessment (HRA) should be performed for the Project. These health risk determinations should quantify and characterize potential Toxic Air Contaminant (TAC) 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. Health risk analyses should include all potential air emissions from the Project, which include emissions from construction of the facility, including multi-year construction, as well as ongoing operational activities of the facility. Note, two common sources of TACs can be attributed to diesel exhaust emitted from heavy- duty off-road earth moving equipment during construction, and from ongoing operation of heavy-duty on-road trucks. A list of TACs identified by OEHHA/CARB can be found at: https://ww2.arb.ca.gov/resources/documents/carb-identified-toxic- air-contaminants Prioritization (Screening Health Risk Assessment): A "Prioritization" is the recommended method for a conservative screening-level health risk assessment. The Prioritization should be performed using the California Air Pollution Control Officers Association's (CAPCOA) methodology. The District recommends that a more refined analysis, in the form of an HRA, be performed for any project resulting in a Prioritization score of 10 or greater. This is because the prioritization results are a conservative health risk representation, while the detailed HRA provides a more accurate health risk evaluation.