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(1) Source: http://www.arb.ca.gov/adam/topfour/topfourl.php <br />Data from the Costa Mesa -Mesa Verde Drive monitoring station unless noted. <br />(2) CAAQS = California Ambient Air Quality Standard; NAAQS = National Ambient Air Quality Standard; ppm = parts per <br />million <br />(3) Data from the Anaheim -Pampas Lane monitoring station. <br />Insufficient data available to determine value. <br />Air Emission Thresholds <br />The incremental regional air quality impact of an individual project is generally very small and difficult to <br />measure. Therefore, SCAQMD has developed significance thresholds based on the volume of <br />pollution emitted rather than on actual ambient air quality because the direct air quality impact of a <br />project is not quantifiable on a regional scale. The SCAQMD CEQA Handbook states that any project <br />in the South Coast Air Basin with daily emissions that exceed any of the identified significance <br />thresholds should be considered as having an individually and cumulatively significant air quality <br />impact. For the project a regional air quality impact would be considered significant if project emissions <br />exceed the SCAQMD significance thresholds shown in Table 4. <br />Table 4 <br />SCAQMD Air Quality Significance Thresholds <br />Mass Daily Thresholds <br />Pollutant <br />Construction Ibs/da <br />Operation Ibs/da <br />NOx <br />100 <br />55 <br />VOC <br />75 <br />55 <br />PM10 <br />150 <br />150 <br />PM2.5 <br />55 <br />55 <br />Sox <br />150 <br />150 <br />CO <br />550 <br />550 <br />Lead <br />3 <br />3 <br />Toxic Air Contaminants, Odor and GHG Thresholds <br />TACs <br />Maximum Incremental Cancer Risk >_ 10 in 1 million <br />Cancer Burden > 0.5 excess cancer cases (in areas >_ 1 in 1 million) <br />Chronic & Acute Hazard Index > 1.0(project increment <br />Odor <br />Project creates an odor nuisance pursuant to SCAQMD Rule 402 <br />GHG <br />10,000 MT/yr CO2e for industrial projects <br />Ambient Air Quality Standards <br />Pollutant <br />SCAQMD Standards <br />NO2 -1-hour average <br />0.18 ppm 338 /m^3 <br />PM10 -24-hour average <br />Construction <br />Operations <br />10.4 pg/m^3 <br />2.5 u /m^3 <br />PM2.5 -24-hour average <br />Construction <br />Operations <br />10.4 pg/m^3 <br />2.5 /m^3 <br />Legacy Sunflower Apartments Page 39 <br />Mitigated Negative Declaration — March 14, 2019 <br />