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San Joaquin Valley Air Pollution Control District Page 2 of 7 District Reference No: 20230798 September 26, 2023 cConstrvuefion Emissions The District recommends , to reduce impacts from construction - related diesel exhaust emissions , the Project should utilize the cleanest available off- road construction equipment . 2 ) -iea th Mont Screening / ssessmentr 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 performed for the Project . These health risk determinations should quantify and characterize potential Toxic Air Contaminants (TACs ) 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 project , including multi - year construction , as well as ongoing operational activities of the project . 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 . 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 . Please contact the District for assistance with performing a Prioritization analysis . 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 . Health Risk Assessment : Prior to performing an HRA , it is strongly recommended that land use agencies/ project proponents develop and submit for District review a health risk modeling protocol that outlines the sources and methodologies that will be used to perform the HRA .