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City of Santa Ana Environmental Checklist As indicated in Table 3-8, implementation of Mitigation Measures AQ-1 and AQ-2 will result in reductions of all criteria pollutant emissions, most notably of PM2.5 by 26% for the conservative case scenarios of an overlap in the components of Grading & Soils Prep and Site Trenching and Building Foundation, and also of an overlap in the components of Building Construction 2014 and Concrete & Asphalt. Implementation of these mitigation measures would reduce emissions of PM2.5 below the SCAQMD significance threshold, and air quality emission impacts related to construction would be less than significant after implementation of mitigation. Table 3-8. Estimate of Localized Construction Emissions after Mitigation (pounds per day) Localized Construction Emissions ROG NOx CO SOx PM10a PM2.5 Excavation & Soils Export AND Grading & Soils Prep" 6 49 28 <1 <1 2.9 Grading & Soils Prep AND Site Trenching & Bldg Foundation" 4 43 29 <1 3.2 3.1 Building Construction 2014 AND Concrete & Asphalt 35 66 50 <1 3.9 3.9 SCAQMD Localized Significance Threshold NA 115 715 NA 6 4 Exceed Thresholds? No No No No No No Notes: Construction emission calculation worksheets are included in Appendix A. a PM1u emissions estimates take into account compliance with SCAQMD Rule 403 requirements for fugitive dust suppression, which require that no visible dust be present beyond the site boundaries, as well as the use of EPA Tier 2 equipment. Localized thresholds derived fi•om SCAQMD Localized Significance Threshold Tables and are based on the project location (Source ReceptorArea [SRAj 17, the Central Orange County), project area disturbed in any given day (2-acres), and the distance to the nearest sensitive receptor (25 meters). Source; SCAQMD Localized Significance Threshold Methodology for CEQA Evaluations, and Particulate Matter (PM) 2.5 Significance Thresholds and Calculation Methodology. Source: ICF 2012. Local Operational Impacts Within an urban setting, vehicle exhaust is the primary source of CO. Consequently, the highest CO concentrations are generally found close to congested intersections. Under typical meteorological conditions, CO concentrations tend to decrease as the distance from the emissions source (i.e., congested intersection) Increases. For purposes of providing a conservative, worst-case impact analysis, CO concentrations are typically analyzed at congested intersection locations, because if impacts are less than significant close to congested intersections, impacts will also be less than significant at more distant sensitive receptor locations. Project traffic during the operational phase of the project would have the potential to create local area CO impacts. SCAQMD recommends a quantitative hot-spot evaluation of potential localized CO impacts when volume-to-capacity ratios are increased by 2% at intersections with a level of service (LOS) of C or worse. Given these criteria, no intersections met the aforementioned requirements for selection based on information provided in the TIA prepared by Fehr & Peers (Appendix D). Because no intersections met the criteria necessary for a quantitative analysis, the project activity would not have a significant impact upon 1- or 8-hour local CO concentrations from mobile source emissions. Thus, operation of the project would not result in significant impacts related to 1- or 8-hour local CO concentrations from mobile source emissions. The Bat Nha Buddhist Meditation Center 3 23 June 2013 Initial Study/Mitigated Negative Declaration ICF 002 15.12 31 C-76