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4.1 – Air Quality Draft Environmental Impact Report February 2021 14800 W. Schulte Road Logistics Center 4.1-39 As shown in Table 4.1-11, operation-generated NOx emissions would exceed the SJVAPCD threshold of significance. Thus, operation-generated impacts after mitigation would be significant and unavoidable with implementation of MM-AQ-1 through MM-AQ-3. Threshold C: Would the Project expose sensitive receptors to substantial pollutant concentrations? Potentially Significant Impact. Health Impacts of Carbon Monoxide As described previously, exposure to high concentrations of CO can result in dizziness, fatigue, chest pain, headaches, and impairment of central nervous system functions. Mobile-source impacts, including those related to CO, occur essentially on two scales of motion. Regionally, Project-related operational travel would add to regional trip generation and increase the vehicle miles traveled within the local airshed and the SJVAB. Locally, Project operational traffic would be added to the roadway system in the vicinity of the Project site. Although the SJVAB is currently an attainment area for CO, there is a potential for the formation of microscale CO hotspots to oc cur immediately around points of congested traffic. Hotspots can form if such traffic occurs during periods of poor atmospheric ventilation, is composed of a large number of vehicles cold -started and operating at pollution- inefficient speeds, and/or is operating on roadways crowded with non-Project traffic. Because of continued improvement in vehicular emissions at a rate faster than the rate of vehicle growth and/or congestion, the potential for CO hotspots in the SJVAB is steadily decreasing. The 2015 SJVAPCD Guidance states that a quantitative CO hotspots analysis should be performed if either of the following two conditions exist: a traffic study for the Project indicates that the LOS on one or more streets or at one or more intersections in the Project vicinity will worsen to LOS E or F, or a traffic study indicates that the Project will substantially worsen an already existing LOS F on one or more streets or at more or more intersections in the Project vicinity (SJVAPCD 2015a). The Traffic Impact Analysis prepared for the Project (Appendix F) evaluated whether there would be a worsening in the LOS (e.g., congestion) at the intersections affected by the Project. The Project’s traffic analysis evaluated six intersections based on existing traffic volumes and current street geometry. The results of the LOS assessment show that under Cumulative Plus Project conditions, four of the six study intersections are forecast to operate at unacceptable LOS (LOS E or worse) during the peak hours, with a volume over 3,000 trips. The four key study intersections according to the criteria above are Hansen Road and Schulte Road (LOS F in PM peak hour), Valpico Road and Lammers Road (LOS F/F in AM/PM peak hour), Valpico Road and Corral Hallow Road (LOS F in PM peak hour), and Lammers Road and 11th Street (LOS F/F in AM/PM peak hours). The remaining key intersections are projected to operate at acceptable LOS conditions in the Cumulative Plus Project scenario. The screening evaluation presents LOS and whether a quantitative CO hotspots analysis may be required. According to the California Department of Transportation (Caltrans) CO Protocol, there is a cap on the number of intersections that need to be analyzed for any one project. For a single project with multiple intersections, only the three intersections representing the worst LOS ratings of the project, and, to the extent they are different intersections, the three intersections representing the highest traffic volumes, need be analyzed. For each intersection failing a screening test as described in this protocol, an additional intersection should be analyzed (Caltrans 2010). Based on the CO hotspot screening evaluation (Appendix B), intersections at Hansen Road and Schulte Road, Valpico Road and Corral Hallow Road, and Lammers Road and 11th Street all have have signalized control. The potential impact of the Project on local CO levels was assessed at these three intersections with the Caltrans CL4