25G - ENGINEERING SRVS GRADE SEPARATION

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The air quality technical report will provide the following discussions and analyses: Regulatory Setting and Existing Conditions. Summarize the existing federal, state, and local air quality regulatory environment as it affects the proposed project, and describe the location of sensitive receptors in the project vicinity. Using data provided by the California Air Resources Board (CARS) and the SCAQMD, characterize existing air quality conditions in the project area and explain how those conditions are affected by local climate and topography. Evaluation of Construction Emissions. Based on current District 12 procedure, provide a qualitative discussion related to construction emissions. Evaluation of Operations-Period Mass Emissions. Evaluate whether the project meets transportation conformity requirements by determining whether it is included, as currently defined, in the most recent Regional Transportation Plan (RTP) and Regional Transportation Improvement Program (RTIP) prepared by the Southern California Association of Governments (SCAG). It is assumed that the projects will be included in the RTIP and that a regional analysis will not be required. Localized Carbon Monoxide Hot Spot Analysis. Analyze the degree to which project-related traffic volumes have a potential to effect local carbon monoxide (CO) concentrations using the California Department of Transportation CO Hotspot Protocol. It is anticipated that the CO screening procedure will be appropriate. However, it is assumed, based on experience within the District that CALINE-4 dispersion modeling will also be performed. It is assumed that up to two intersections will be modeled. Localized PM2.51,PMI0 Hot Spot Analysis. Analyze the degree to which project-related traffic volumes have a potential to affect local PM2.5 and PM 10 concentrations, based on the United States Environmental Protection Agency (EPA) guidance document entitled Transportation Conformity Guidance for Qualitative Hot-spot Analyses in PM2.5 and PM 10 Nonattainment and Maintenance Areas. This scope and cost assumes that a screening level analysis is appropriate, and that no modeling will be required by Caltrans or FHWA to address PM2.5 and PM 10. Mobile Source Air Taxies. Evaluate proposed project-related mobile source air toxics (MSATs) emissions in accordance with FHWA interim guidance on how MSATs should be addressed in NEPA documents. It is not assumed that extensive qualitative analyses would be required to address MSATs. If an extensive quantitative analysis is required for the project, then a scope and cost estimate would be provided for this additional effort, however, such an analysis is not anticipated. Climate Change1Greenhouse Gas Emissions. A quantification of operational-period greenhouse gas (GHG) emissions associated with implementation of the proposed project will be conducted- Consistent with current Caltrans policy, construction-period GHG emissions will not be quantified. Operations-period GHG emissions will be quantified using regional daily peak-period and non-peak-period vehicle miles traveled (VMT) apportioned into 5 mph speed bins for speeds between 5 mph and 75 mph; and the CT-EMFAC emissions model. ICF Jones & Stokes will present a comparison of GHG emissions associated with the Build Alternative(s) to the No-build Alternative to characterize effects of the proposed project on OHO emissions. The analysis of climate change also will also incorporate the most recent guidance found on the Caltrans Standard Environmental Reference and Caltrans annotated outline. Air Quality Conformity Analysis Report and Checklist Under NEPA delegation, the federal air quality conformity determination has not been delegated to Caltrans and must be made by FHWA. We will prepare a separate Air Quality Conformity Analysis using the annotated outline for this report on the SER at the time that the report is initiated and will also prepare the Conformity Checklist based on the checklist that is available on the SER at the time that the Air Quality Conformity Analysis Report is prepared. SCAG Transportation Conformity Working Group. The required TCWG form will be completed and submitted for forwarding to SCAG for inclusion on the agenda for determining if the project is a project of air quality concern (POAQC). It is assumed the project will be found to not be a POAQC and that no specific analysis will be required related to the TCWG determination other than what is already included in this scope of work. Mitigation Measures. ICF Jones & Stokes will develop mitigation measures, where applicable, to address significant air quality impacts, if present. City of Santa A- 25G-170