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6.0 Other CEQA Considerations

As determined in Section 4.G, Noise, no on- or off-site point source significant
unavoidable operational noise impacts would result from the Skyline Ranch project with the
implementation of the recommended mitigation measures. However, noise levels at noise-
sensitive uses along a number of the roadway segments affected by project traffic are already
considered unacceptable under the City and State Guidelines and, as such, project noise impacts
at these locations are considered to be significant under Criterion 3 (see Section 4.G for a
discussion of the different criteria). Therefore, off-site mobile noise levels would result in
significant and unavoidable impacts.

In addition, development of the proposed project and the related projects would result in
significant cumulative noise impacts at sensitive receptor locations along segments of Sierra
Highway and Whites Canyon Road under Criteria 2 and 3.

4. Air Quality (See Section 4.H of this Draft EIR)

Although the recommended mitigation measures would reduce the magnitude of
construction- and operation-related emissions to some extent, feasible mitigation is not available
to reduce all emissions to below the SCAQMD’s recommended thresholds of significance. The
project’s construction-related regional emissions of PM 10, PM 2.5, CO, NO X, and VOC and local
emissions of PM 10, and PM 2.5, while temporary, would be significant and unavoidable.
Similarly, the project’s operation-related regional emissions of PM 10, PM 2.5, CO, NO X, and VOC
would be significant and unavoidable.

In addition, the project would contribute to a significant and unavoidable cumulative
construction air quality impact given that the Basin is non-attainment for ozone, PM 10, and
PM 2.5, and that the project results in short-term regional construction impacts for ozone
precursors (VOC and NO X), and PM 10 and PM 2.5. Moreover, project-related localized
construction emissions would contribute to a significant unavoidable cumulative air quality
impact.

Furthermore, implementation of the project would result in an increase in emissions
which would contribute to region-wide emissions on a cumulative basis and as such, the
project’s contribution to cumulative air quality impact is concluded to be significant and
unavoidable.

5. Solid Waste Disposal (See Section 4.K of this Draft EIR)

Although the project itself is not expected to have a significant impact on solid waste
disposal, it is accepted that the uncertainties regarding future landfill capacity could result in a
worst case scenario where shortages in landfill capacity could result. Thus, it is conservatively
concluded that the project together with projected growth in the County could result in a
cumulatively significant impact on solid waste disposal. If such shortages in landfill capacity

County of Los Angeles Department of Regional Planning Skyline Ranch Project
PCR Services Corporation July 2009

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PRELIMINARY WORKING DRAFT – Work in Progress