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City of Pleasanton 475 and 493 St. John Street Mixed-Use Project 22 The DSP EIR anticipated operational emissions for ROG and PM2.5 would have a significant and unavoidable impact. However, as shown in Table 4, operational emissions of the project would not exceed BAAQMD regional thresholds for criteria pollutants. Therefore, project operation would not result in a cumulatively considerable net increase of any criteria pollutant for which the project region is in non-attainment, and impacts would be less than significant. CARBON MONOXIDE HOTSPOTS The Barone’s project would generate approximately 239 daily vehicle trips during the weekday, 159 daily vehicle trips on Saturday, and 128 daily vehicle trips on Sunday. The trip generation rates for single family and commercial building developments were based on average trip rates from the Institute of Transportation Engineers (ITE) 10th edition of the Trip Generation Manual (California Air Pollution Control Officers Association [CAPCOA] 2022). BAAQMD recommends comparing project’s attributes with the following screening criteria as a first step to evaluating whether the project would result in the generation of carbon monoxide concentrations that would substantially contribute to an exceedance of the Thresholds of Significance. The project would result in a less than significant impact to localized carbon monoxide concentrations if: 1. The project is consistent with an applicable congestion management program for designated roads or highways, regional transportation plan, and local congestion management agency plans. 2. The project would not increase traffic volumes at affected intersections to more than 44,000 vehicles per hour. 3. The project traffic would not increase traffic volumes at the affected intersections to more than 24,000 vehicles per hour where vertical and/or horizontal mixing is substantially limited (e.g., tunnel, parking garage). As discussed further in Section 5.12, Traffic and Transportation, the project would result in a net decrease in vehicle trips compared to trips generated by existing land uses within the project site. Therefore, the project would not conflict with the Alameda County Congestion Management Program. According to the City of Pleasanton Traffic Volume Map, the traffic volumes in 2020 near the project site have an existing traffic volume of 12,000 vehicles per day (City of Pleasanton 2020). Therefore, the estimated 12,239 vehicle trips per day on the intersection of Saint John Street and Santa Rita Road would not exceed the thresholds of 44,000 vehicles per hour or 24,000 vehicles per hour as outlined in screening criteria 2 and 3 above. Therefore, the project would result in a less than significant impact related to carbon monoxide concentrations. Sensitive Receptors and Substantial Pollutant Concentrations. In addition to impacts from criteria pollutants, project impacts may include emissions of pollutants identified by the State and federal governments as toxic air contaminants (TACs). The greatest potential for TAC emissions during construction would be diesel particulate emissions from heavy equipment operations. The Barone’s project construction would occur over approximately 26 months. The nearest sensitive receptors include the single-family residence located within the project site, and residences adjacent to the project site to the west. The Barone’s project would be consistent with the applicable Clean Air Plan requirements and control strategies intended to reduce emissions from construction equipment and activities. The Barone’s project would be required to comply with the CARB Air Toxics Control Measure that limits diesel powered equipment and vehicle idling to no more than five minutes at a location, and the CARB In-Use Off-Road Diesel Vehicle Regulation; compliance with these would minimize emissions of TACs during construction.