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San Joaquin Valley Air Pollution Control District Page 2 of 7 District Reference No : 20230038 February 6, 2023 information available on the project ' s compliance /emissions with Rule 9510 ) or a quantification for all pollutants to support a less than significant impact conclusion on air quality . Further information can be found in the District ' s Guidance for Assessing and Mitigating Air Quality Impacts ( GAMAQI ) at : https : //www . valle ay ir . org /transportation /GAMAQI . pdf . 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 . 2 ) Health Risk Screening /Assessment The MND states that the Project will have a less than significant impact with mitigation incorporated regarding sensitive receptors exposure to substantial pollutant concentrations ; however the air quality narrative only includes a discussion on Rule 9510 and the mitigation measures associated with the Rule . For future project emissions assessment , to justify a finding of less than significant with mitigation incorporated on potential risk to sensitive receptors the District recommends the County provide a quantitative and /or qualitative justification for this determination specific to sensitive receptors . For example , 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 .