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• Draft Supplemental Environmental Impact Report Page IV.H-7 Forward Inc. Landfill 2018 Expansion Project Sound barriers are not feasible in the semi-rural areas that would be affected by cumulative traffic increases, because the barriers would be far removed from the activity areas of sensitive receptors and the sound barriers would generally be an unnatural barrier not only to noise but also to distant views now possible in these areas. Thus, no mitigations are available for this cumulative impact other than • reducing project operations. • • The project would contribute to a cumulatively significant and unmitigable increase in air pollutant emissions. The proposed project would have a less than • significant (project-level) impact on ozone impacts (after implementation of • Mitigation Measures IV.D-2a and D-2b). However,cumulative projects within the project vicinity would potentially result in a significant impact for ozone. The residual emissions from the project(emissions after mitigation and emissions from the extended years of landfill operations, and increased daily acceptance rate • [above existing actual emissions],as a result of the project)would contribute to the overall ozone impact in the region. With Mitigation Measure IV.D-2a and D-2b, the impacts of PM10 from the project • individually would be less than significant. However,the project would add to the • cumulatively significant impact for particulate matter within the project vicinity. Because the project would result in PM10 emissions from traffic and operations every day (due to the extended years of landfill operations as a result of the project), the project contribution would be cumulatively considerable. • No cumulatively potentially significant impacts were identified for the following topics: Public Health and Safety, Hydrology and Water Quality, Soils and Geology, Vegetation and Wildlife, Public Services and Utilities, Cultural Resources, and Visual Quality. • H. Significant Unavoidable Adverse Impacts After mitigation, project implementation would have the following unavoidable significant adverse impacts: • Project traffic would contribute to unacceptable Levels of Service at the following • intersections under 2035 cumulative conditions: • o SR 99 SB On-off Ramps & E. French Camp Rd., (AM and PM peak hours) o SR 99 Urban Interchange&Arch Rd. (AM and PM peak hours) • o SR 99 SB On-off Ramps & Mariposa Rd. (AM and PM peak hours) • o SR 99 NB On-off Ramps &Mariposa Rd. (PM peak hour) Because no mitigation would be feasible at these intersections, this impact would be significant and unavoidable. • • The project would contribute to a cumulatively significant increase in air pollutant • emissions (ozone precursors) and PM10. •