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San Joaquin Valley Air Pollution Control District Page 3 of 7 District Reference No : 20230798 September 26, 2023 A development project would be considered to have a potentially significant health risk if the HRA demonstrates that the health impacts would exceed the District ' s established risk thresholds , which can be found here . http : //www , valleyair . org /transportation / cega idx . htm . 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@valleyair . org 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 to prevent the creation of a significant health risk in accordance to CARB ' s Air Quality and Land Use Handbook : A Community Health Perspective located at https : //ww2 . arb . ca . gov/ our-work/ programs / resou rce - center/strategy - development/ land - use - resources . 3 ) Ambient Air Quality Analysis An Ambient Air Quality Analysis (AAAA) uses air dispersion modeling to determine if emissions increases from a project will cause or contribute to a violation of State or National Ambient Air Quality Standards . The District recommends an AAQA be performed for the Project if emissions exceed 100 pounds per day of any pollutant . An AAQA uses air dispersion modeling to determine if emission increase from a project will cause or contribute to a violation of State or National Ambien Air Quality Standards . An acceptable analysis would include emissions from both project . specific permitted and non - permitted equipment and activities . The District recommends consultation with District staff to determine the appropriate model and input data to use in the analysis .