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5.0 Environmental Analysis 5.5 Air Quality <br />Avion Project SEIR <br />Page 5.5-12 <br />5.5.4.3 Significance of Impacts <br />The project would not exceed construction emission levels based on the significance determination <br />thresholds. Therefore, maximum daily construction emissions are projected to be less than the <br />applicable thresholds for all criteria pollutants, and impacts would be less than significant. <br />5.5.3.4 Mitigation, Monitoring, Reporting <br />Mitigation would not be required. <br />5.5.5 Issue 2: Sensitive Receptors (Construction) <br />• Would the project expose sensitive receptors to substantial pollutant concentrations? <br />5.5.5.1 Threshold <br />The SDAPCD’s Supplemental Guidelines for Submission of Air Toxics “Hot Spots” Program Health <br />Risk Assessments (SDAPCD 2015) provides guidance to perform health risk assessments (HRAs) <br />within the SDAB. Although the SDAPCD guidance is specifically targeted toward health risk from air <br />toxic emissions from stationary source operations, the thresholds were adapted here for <br />informational purposes. The SDAPCD’s current thresholds of significance for toxic air contaminant <br />emissions from the operations of permitted and non-permitted sources are presented in <br />Table 5.5-4. <br />Table 5.5-4 <br />SDAPCD CEQA Toxic Air Contaminant Emissions Thresholds <br />Carcinogens <br />Non-Carcinogens <br />Chronic <br />Maximally exposed individual risk <br />equals or exceeds 10 in 1 million <br />Hazard Index equals or exceeds 1 <br />for the maximally exposed individual <br /> <br />5.5.5.2 Impacts <br />Sensitive land uses include schools and schoolyards, parks and playgrounds, daycare centers, <br />nursing homes, hospitals, and residential communities. Sensitive receptors surrounding the project <br />site are limited to residential uses located northeast of the project site. <br />Construction of the project and associated infrastructure would result in short-term diesel exhaust <br />emissions from on-site heavy-duty equipment. Construction of the project would result in the <br />generation of diesel­exhaust diesel particulate matter (DPM) emissions from the use of off-road <br />diesel equipment required for site grading and excavation, paving, and other construction activities <br />and on-road diesel equipment used to bring materials to and from the project site. <br />Generation of DPM from construction projects typically occurs in a single area for a short period. <br />According to the Office of Environmental Health Hazard Assessment (OEHHA), health risk