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San Joaqu/n Va//ey A4 Po//uNon Contra/O/strbf Page 3 O/aMc[Rafaianca No.2020>082 January>2,202> emissions models and emission factors. CaIEEMod is available to the public and can be downloaded from the CaIEEMod website at: www.caleemod.com. 2) Health Risk Screening/Assessment 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/GARB can be found at: httos�//w 2 6 a / ourcas/documents/carb=d t'f' d-t -a"r-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 CAPCOA's updated methodology, is the recommended screening method. A prioritization score of tO or greater is considered to be significant and a refined Health Risk Assessment (HRA) should be pertormed. For your convenience, the District's prioritization calculator can be found at: htto�ww all r /busind/oto/amiss" o f t /Cr""ter a/Toxics/Utilities/PRIO RITIZATION%20RMR%20201 6.XLS. ii) The District recommends a refined HRA for development projects that result in a prioritization score of 1 O or greater. Prior to pertorming an HRA, it is recommended that development project applicants contact the District to review the proposed modeling protocol. A development project would be considered to have a significant health risk if the HRA demonstrates that the project related health impacts would exceed the Districts significance threshold of 20 in a million for carcinogenic risk and 1.0 for the Acute and Chronic Hazard Indices, and would trigger all feasible mitigation measures. The District recommends that development projects which result in a significant health risk not be approved. For HRA submittals, please provide the following information electronically to the District for review: