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San Joapu/n Va//ay A/�Po//u Hon Contin/OfsMct Paga 3 0l H O/str/M Ralarenre No:2023069f JU/y f2.2023 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 axh oust 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. The District recommends that a more refined analysis, in the force of an HRA, be pertormed for any project resulting in a Prioritization score of 1 O 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. To assist land use agencies and project proponents with Prioritization analyses, the District has created a prioritization calculator based on the aforementioned CAPCOA guidelines, which can be found here: htto�//www II o c/busied/oto/e f t s/C riteria/Toxics/Ut'I't' /PRIORI TIZATI ON-CALCULATOR"xis 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 pertorm the HRA. This step will ensure all components are addressed when pertorming the HRA. A development project would be considered to have a potentially signiFcant health risk if the HRA demonstrates that the project-related health impacts would exceed the District's significance threshold of 20 in a million for carcinogenic risk, or 1.0 for either the Acute or Chronic Hazard Indices" A project with a significant health risk would trigger all feasible mitigation measures. The District strongly recommends that development projects that result in a significant health risk not be approved by the land use agency. The District is available to review HRA protocols and analyses. For HRA submittals please provide the following information electronically to the District for review: HRA (AERMOD) modeling files HARP2 files Summary of emissions source locations, emissions rates, and emission factor calculations and methodologies. For assistance, please contact the District's Technical Services Department by: