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District CEQA Reference No. 20190892 Page 3 of 6 <br />(https://www.arb.ca.gov/toxics/healthval/healthval.htm) that pose a present or <br />potential hazard to human health. A common source of TACs can be attributed <br />to diesel exhaust emitted from both mobile and stationary sources. Industry <br />specific TACs generated must also be identified and quantified. <br />The District recommends the Project be evaluated for potential health impacts to <br />surrounding receptors (on-site and off-site) resulting from operational and multi- <br />year construction TAC emissions. <br />The District recommends conducting a screening analysis that includes all <br />sources of emissions. A screening analysis is used to identify projects which <br />may have a significant health impact. A prioritization, using CAPCOA's <br />updated methodology, is the recommended screening method. A prioritization <br />score of 10 or greater is considered to be significant and a refined Health Risk <br />Assessment (HRA) should be performed. The prioritization calculator can be <br />found at: <br />http:www.valleyair.org/busind/pto/emission_factors/Criteria/Toxics/Utilities/PR <br />IORITIZATION%2ORMR°/0202016.XLS. <br />The District recommends a refined HRA for projects that result in a prioritization <br />score of 10 or greater. It is recommended that the Project proponent contact <br />the District to review the proposed modeling protocol. The Project would be <br />considered to have a significant health risk if the HRA demonstrates that the <br />Project related health impacts would exceed the Districts significance threshold <br />of 20 in a million for carcinogenic risk and 1.0 for the Acute and Chronic Hazard <br />Indices. <br />Please provide the following information electronically to the District for review: <br />HRA AERMOD model files <br />HARP2 files <br />Summary of emissions source locations, emissions rates, and emission <br />factor calculations and methodology. <br />More information on toxic emission factors, prioritizations and HRAs can be <br />obtained by: <br />E-Mailing inquiries to: hramodeler@valleyair.org; or <br />The District can be contacted at (559) 230-6000 for assistance; or <br />Visiting the Districts website (Modeling Guidance) at <br />http://www.val leyairorg/busind/ptoffox_Resou rces/AirQ ua I ityMonitoring htm