25B - AGMT - ENVIRONMENTAL SERVICES FOR WARNER AVE WIDENING

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Documentation/Response to Comments A draft traffic impact report will be prepared for incorporation into the Draft Environmental Impact Report (DEIR). Following public release of the DEIR, IBI Group will assist in the preparation of responses to public comments on traffic and transportation issues received on the DEIR. IBI Group will provide responses to comments for incorporation into the Final Environmental Impact Report. Deliverable: • Draft Traffic Impact Report NOISE:: AND VIBRATION ANALYSIS The Planning Center will prepare a noise analysis that will document existing noise levels through noise modeling and short- term noise monitoring program. Future noise levels will be conducted for the design year noise and horizon year for the Preferred Alternative and the No Build Alternative. All noise modeling will be conducted using the FHWA's Traffic Noise Model, version 2.5. The noise analysis will evaluate increases in the traffic noise environment associated with it potential increase in roadway speeds and/or traffic volume. Construction-related noise (traffic and construction equipment) and vibration will also be evaluated. Deliverable: ® Noise and Vibration Modeling (model output and output sheets) AIR QUALITY STUDY The project site is located in the South Coast Air Basin (SoCAB), which is designated under the National and California Ambient Air Quality Standards (AAQS) as non-attainment for ozone (O,) and particulate matter (PM,e and PM2_s). For operation of the project, regional and localized air quality modeling will be conducted for the Preferred Alternative and the No-Build Alternative. Any increase in air pollutant emissions associated with the project will be compared to the South Coast Air Quality Management District's (SCAQMD) regional emissions thresholds. Localized air quality modeling will be conducted at up to six congested intersections to determine concentrations of carbon monoxide (CO) and compare them to the AAQS for buildout year with the project. Regional air pollutant modeling will be also be conducted for construction activities and compared to the SCAQMD's regional emissions thresholds. The SCAQMD also requires an analysis of the potential for construction activities to result in substantial concentrations of air pollutants. Consequently, dispersion modeling will be conducted to determine concentrations of air pollutants generated during construction activities at nearby sensitive receptors. In addition, , a CO hotspot analysis for traffic detours and/or lane closures will be conducted for temporary impacts at up to six congested intersections. The Planting Center will also provide a discussion of global climate change impacts with respect to the effects of greenhouse gas (GHG) emissions, regulatory history of GHG emissions regulation, and GHG emissions associated with the project. Modeling of GHG emissions will be conducted for construction and operational emissions associated with the project. Deliverable: Air Quality Modeling (model output and output sheets) City of Santa Ana - Proposal to Prepare Environmental Documents for Warner Avenue Wkk nin4 Project The Planning Center 1 Page 4 25B-12