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San Joaquin Valley Air Pollution Control District Page 3 of 7 District Reference No: 20230038 February 6, 2023 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 . valleyair . org / busind / pto /emission factors / Criteria /Toxics / Utilities / PRIORI TIZATIWCALCULATOR . As 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 . This step will ensure all components are addressed when performing the HRA . 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 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 : • E - Mailing inquiries to : hramodeler ( Dvalleyair . org • Calling ( 559 ) 230 - 5900 3) Truck Routing Truck routing involves the assessment of which roads Heavy Heavy - Duty ( HHD ) trucks take to and from their destination , and the emissions impact that the HHD