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San Joaquin Valley Air Poitution Contra/District Page 4 District Reference Mo.20220181 March 16,2022 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/ca rb-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. 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: http:www vallevair ora/busind/oto/emission facto rs/C rite ria/Toxics/Util ities/P RI ORITI ZATIO N%20RM R%202016.XLS Health Risk Assessment: Prior to performing an HRA, it is strongly recommended that land use agencies/development project proponents contact the District to review the proposed health risk modeling protocol. A development project would be considered to have a potentially 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, 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) model files . HARP2 files . Summary of emissions source locations, emissions rates, and emission factor calculations and methodology. For assistance, please contact the District's Technical Services Department by: . E-Mailing inquiries to: hramodeleKcD-vallevair.om . Calling (559) 230-5900 Recommended Measure: Development projects resulting in TAC emissions should be located an adequate distance from residential areas and other sensitive receptors