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Page IV.D-22 Pa Draft Environmental Impact Report g Forward Landfill Expansion + Impact IV.D.3: Project traffic would increase localized carbon monoxide concentrations at intersections in the project vicinity. The SJVAPCD has established two thresholds of significance for CO emissions. The i thresholds are CO concentrations of 9 ppm for a 1-hour averaging time, and 20 ppm for an 8-hour averaging time. Increased CO concentrations are considered significant if they result in concentrations greater than the significance threshold(s). SJVAPCD has established that if neither of the following screening criteria is met at all intersections affected by the developmental project, the project would have no potential to create a violation of the CO standard: • A traffic study for the project indicates that the Level of Service (LOS)on one or more streets or at one or more intersections in the project vicinity will be reduced 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. The Project is proposing to increase the peak number of haul vehicles per day to 960, and the annual number of vehicles to 270,570(870 per day on average). The project traffic study conducted in support of the Project indicated that under the 2035 General Plan Plus Project Conditions scenario, the LOS of the intersection of Austin Road and Arch Road would be F and worsened by the Project. All other intersections had a LOS better than E and passed the screening criteria. i Because the intersection of Austin Road and Arch Road did not pass the screening criteria, it was evaluated for significance using the CalTrans Transportation Project-Level Carbon Monoxide Protocol. The Project has the potential for adverse air quality impacts; w therefore, it was evaluated using the screening methodology in Appendix A of the CO Protocol. Results of the analysis indicate the peak 1-hour concentration of CO is 17.9 ppm, which is less than the threshold of 20 ppm and therefore Iess than significant. Mitigation Measure IV.D.3: None required. �i ` .I 1F L. 1 :.