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AUGUSTIN BERNAL MOUNTAIN BIKE TRAIL PROJECT DRAFT INITIAL STUDY Table 3.3-2.Average Daily Unmitigated Construction Emissions ANW NO H pounds per day 2022 2.2 22.8 1.0 1.0 BAAQMD Construction 54 54 82 54 Thresholds Exceed Threshold? No No No No Source:Appendix B Notes:The values shown are average daily emissions based on total overall tons of construction emissions,converted to pounds,and divided by 65 actives workdays. ROG=reactive organic gases; NOx=oxides of nitrogen;PMio=coarse particulate matter; PM2.5=fine particulate matter As shown in Table 3.3-2, air pollutant emissions during project construction would be well-below the significance thresholds. Therefore, criteria air pollutant emissions during construction would be less than significant. Operations. Long-term air emissions impacts are associated with any change in permanent use of the project site by on-site stationary and off-site mobile sources that substantially increase vehicle trip emissions. No stationary sources of emissions are proposed as part of the project. Once completed, the proposed project would not generate significant vehicle or other emissions. Therefore, long-term operation of the proposed project would have a less-than-significant impact in relation to regional operational emissions. In regard to localized CO concentrations, according to the BAAQMD thresholds, a project would result in a less-than-significant impact if the following screening criteria are met: 1. The project is consistent with an applicable congestion management program established by the county congestion management agency for designated roads or highways, regional transportation plan,and local congestion management agency plans. 2. The project traffic would not increase traffic volumes at affected intersections to more than 44,000 vehicles per hour. 3. The project traffic would not increase traff ic volumes ataffected intersections to more than 24,000 vehicles per hour where vertical and/or horizontal mixing is substantially limited (e.g., tunnel, parking garage, bridge underpass, natural or urban street canyon, below- grade roadway). The project would generate minimal traffic trips as described in Section 3.17(b)and would comply with the BAAQMD screening criteria. Accordingly, project-related traffic would not exceed CO standards and therefore, no further analysis was conducted for CO impacts. This CO emissions impact would be less than significant for the project as well as the cumulative scenario. Past, present, and future development projects may contribute to the region's adverse air quality impacts on a cumulative basis. Per BAAQMD CEQA Guidelines, by nature, air pollution is largely a cumulative impact; no single project is sufficient in size to, by itself, result in nonattainment of ambient air quality standards. In developing thresholds of significance for air pollutants, BAAQMD considered the emission levels for which a project's individual emissions would be cumulatively 12956 DUDEK 24 April 2022