6 - GPA19-01; AA19-01_651 W SUNFLOWER AVENUE

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Legacy Sunflower Apartments Page 45 Mitigated Negative Declaration – March 14, 2019 Operations-Related Local Air Quality Impacts Project-related air emissions may have a potential to exceed the State and Federal air quality standards in the project vicinity, even though the pollutant emissions may not be significant to create a regional impact to the SCAB. The project was analyzed for potential local CO emission impacts from project-generated vehicular trips and on-site operations. Local CO Emission Impacts from Project-Generated Vehicular Trips CO is the pollutant of major concern along roadways because the most notable source of CO is the operation of motor vehicles. For this reason, CO concentrations are usually indicative of the local air quality generated by a roadway network and are used as an indicator of potential local air quality impacts. To determine if the project could generate emission levels in excess of the CO standards, a sensitivity analysis is typically conducted to determine the potential for CO “hot spots” at intersections in the general project vicinity. Because of reduced speeds and vehicle queuing, “hot spots” potentially can occur at high traffic volume intersections with a Level of Service E or worse. The intersection in the project area with the highest traffic volume is Bristol Street at Anton Boulevard with an evening peak hour volume of 2,203 trips (Year 2040 Buildout Plus Project). The 1992 Federal Attainment Plan for Carbon Monoxide (1992 CO Plan) showed that an intersection with a daily traffic volume of approximately 100,000 vehicles per day would not violate the CO standard. Therefore, as the intersection with the highest traffic volume falls far short of 100,000 vehicles, no CO “hot spot” modeling was performed for the project. As a result, the project would not have any significant long- term CO emission impact to local air quality. Local Air Quality Impacts from On-Site Operations Project-related air emissions from on-site sources such as architectural coatings, the operation of landscape equipment, on-site usage of natural gas appliances and the operation of vehicles on-site may have the potential to exceed the State and Federal air quality standards in the project vicinity, even though these pollutant emissions may not be significant enough to create a regional impact to the Air Basin. According to SCAQMD LST methodology, LSTs would apply to the operational phase of a project, if the project includes stationary sources, or attracts mobile sources (such as heavy-duty trucks) that may spend long periods queuing and idling at the site; such as industrial warehouse/transfer facilities. The project is a multi-family attached residential project and does not include such uses. Therefore, due the lack of stationary source emissions, no long-term localized significance threshold analysis is warranted. The project would not generate any air emissions that exceed SCAQMD thresholds. The elementary school and the residential development west, south and east of the project, respectively, are considered sensitive land uses. Because the project would not generate any air emissions that exceed adopted emission thresholds, the sensitive receptors adjacent to the project would not be exposed to substantial pollutant concentrations. Construction and long-term operational emissions by the project would not significantly impact any sensitive receptors adjacent to or in the project vicinity. 6-67