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<br />Legacy Sunflower Apartments Page 39 <br />Mitigated Negative Declaration – March 14, 2019 <br /> <br />(1) Source: http://www.arb.ca.gov/adam/topfour/topfour1.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 /> <br />Air Emission Thresholds <br /> <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 /> <br />Table 4 <br />SCAQMD Air Quality Significance Thresholds <br /> <br />Mass Daily Thresholds <br />Pollutant Construction (lbs/day) Operation (lbs/day) <br />NOx 100 55 <br />VOC 75 55 <br />PM10 150 150 <br />PM2.5 55 55 <br />SOx 150 150 <br />CO 550 550 <br />Lead 3 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 Project creates an odor nuisance pursuant to SCAQMD Rule 402 <br />GHG 10,000 MT/yr CO2e for industrial projects <br />Ambient Air Quality Standards <br />Pollutant SCAQMD Standards <br />NO2 -1-hour average 0.18 ppm (338 µg/m^3) <br />PM10 -24-hour average <br />Construction <br />Operations <br />10.4 µg/m^3 <br />2.5 ug/m^3 <br />PM2.5 -24-hour average <br />Construction <br />Operations <br />10.4 µg/m^3 <br />2.5 µg/m^3 <br />6-61