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District CEQA Reference No : 20180096 Page 3 of 6 emissions models and emission factors . CalEEMod is available to the public and can be downloaded from the CalEEMod website at : www . caleemod . com . c) Nuisance Odors : The Project should be evaluated to determine the likelihood that the Project would result in nuisance odors . Nuisance orders are subjective , thus the District has not established thresholds of significance for nuisance odors . Nuisance odors may be assessed qualitatively taking Into consideration of Project design elements and proximity to off site receptors that potentially would be exposed objectionable odors . dj Health Risk Screening /Assessment : A Health Risk Screening /Assessment identifies potential Toxic Air Contaminants (IAC ' 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 Assess ment/ Californla Air Resources Board ( OEHHA/CARB ) ( https : //www . arb . ca . gov/toxics / healthval/healthvalthtm ) 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 . Industry specific TACs generated must also be identified and quantified . The District recommends the Project be evaluated for potential health impacts to surrounding receptors (on - site and offsite } resulting from operational and multi - year construction TAG emissions . ij 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 10 or greater is considered to be significant and a refined Health Risk Assessment ( HRA) should be performed . The prioritization calculator can be found at : http : www . valleyair . org /busind /pto/emission factors / Criteria/Toxics / Utilities /PR I ORITIZATION %20RMR % 202016 , XLS . The District recommends a refined HRA for projects that result in a prioritization score of 10 or greater . It is recommended that the Project proponent contact the District to review the proposed modeling protocol . The 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 .