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City of Santa Ana Environmental Checklist b. Violate any air quality standard or contribute substantially to an existing or projected air quality violation? Less-than-Signlflcant Impact. As discussed above, the project site is located within the Basin, where state and federal air quality standards are occasionally exceeded. The proposed project would contribute to regional air pollutant emissions during construction (short-term) and project operations (long-term). Construction Impacts Construction of the proposed project has the potential to create air quality impacts through the use of heavy-duty construction equipment and through vehicle trips generated from construction workers traveling to and from the project site. In addition, fugitive dust emissions would result from site work related to the excavation and export of 3,021 total cubic yards of soil materials. Mobile source emissions, primarily NOx, would result from the use of construction equipment such as graders, scrapers, bulldozers, wheeled loaders, and cranes. During the structure erection/finishing phase, paving operations and the application of architectural coatings (i.e., paints) and other building materials would release ROG emissions. Construction emissions can vary substantially from day to day, depending on the level of activity, the specific type of operation, and, for dust, the prevailing weather conditions. The assessment of construction air quality impacts considers each of these potential sources. Construction of the proposed project is anticipated to take approximately 19 months to complete. The total magnitude of construction activity, duration of construction activity, and intensity of construction activity would have a substantial effect upon the quantity of construction emissions (and related pollutant concentrations) occurring at any one time. As such, the emission forecasts provided herein reflect a specific set of conservative assumptions based on the expected construction scenario wherein a relatively large amount of construction activity is occurring in a relatively intensive manner. As provided in Table 3-5, construction-related daily (short-term) emissions for the scenarios during which emissions from construction components could possibly overlap are provided to be conservative. As shown, in no components or scenarios do emissions exceed the SCAQMD regional thresholds, and short-term construction emissions can be considered less than significant. Table 3-5. Estimate of Regional Construction Emissions (pounds per day) Regional Construction Emissions ROG NOx CO SOx PM10 PM2.5 Demolition 5 39 25 <1 4 2 Excavation & Soils Export 5 36 20 <1 6 2 Grading &Soils Prep 3 26 16 <1 3 2 Site Trenching & Bldg Foundation 2 31 23 <1 3 2 Building Construction 2013 9 52 38 <1 5 4 Building Construction 2014 9 49 37 <1 4 4 Concrete & Asphalt 5 27 20 <1 3 2 Architectural Finishing 19 3 4 <1 1 <1 SCAQMD Regional Threshold 75 100 550 150 150 55 Exceed Threshold? No No No No No No The Bat Nha Buddhist Meditation Center 3-19 June 2013 Initial Study/Mitigated Negative Declaration ICi 00215.12 31 C-72