3 - The Bowery_PUBLIC COMMENT_RAMSEY

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5.0 Environmental Analysis 5.5 Air Quality Avion Project SEIR Page 5.5-11 Primary inputs are the numbers of each piece of equipment and the length of each construction stage. Specific construction phasing and equipment parameters are not available at this time. However, CalEEMod can estimate the required construction equipment when project-specific information is unavailable. The estimates are based on surveys, performed by the South Coast Air Quality Management District and the Sacramento Metropolitan Air Quality Management District of typical construction projects, which provide a basis for scaling equipment needs and schedule with a project’s size. Air emission estimates in CalEEMod are based on the duration of construction phases; construction equipment type, quantity, and usage; grading area; season; and ambient temperature, among other parameters. Emissions were modeled assuming that construction would last approximately two years. Construction equipment included in the emission calculations was based on construction equipment required for the adjacent Heritage Bluffs project, which required construction and blasting activities that would be similar to the project. Table 5.5-3 shows the total projected construction maximum daily emission levels for each criteria pollutant. Standard dust control measures would be implemented as a part of project construction in accordance with SDAPCD rules and regulations. Fugitive dust emissions were calculated using CalEEMod default values, and did not take into account the required dust control measures. Additionally, the area around the blast site would be watered the day before and the morning of the blast in order to dampen the dust. Thus, the emissions shown in Table 5.5-3 are conservative. Table 5.5-3 Summary of Worst-case Construction Emissions (pounds per day) Emissions ROG NOX CO SOX PM10 PM2.5 Site Preparation 4 46 23 <1 21 12 Grading/Blasting 13 120 87 <1 15 10 Building Construction 2 20 18 <1 1 1 Paving 1 13 15 <1 1 1 Architectural Coatings 24 2 2 <1 <1 <1 Maximum Daily Emissions 24 120 87 <1 21 12 Significance Threshold 250 250 550 250 100 67 ROG = reactive organic gases; NOX = nitrogen oxide; CO = carbon monoxide; SOX = sulfur oxide; PM10 = particulate matter less than 10 microns; PM2.5 = particulate matter less than 2.5 microns As shown in Table 5.5-3, project construction would not exceed the applicable regional emissions thresholds, including those for PM10 and PM2.5. These thresholds are designed to provide limits below which project emissions would not significantly change regional air quality. Therefore, as construction emissions would be well below these limits, the project would not result in regional emissions that would exceed the NAAQS or CAAQS or contribute to existing violations. Furthermore, Table 5.5-3 shows that construction emissions of PM10 and PM2.5 would not exceed 100 pounds per day. Therefore, the project would not violate any air quality standard or contribute substantially to an existing or projected air quality violation.