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SCOPE OF SERVICES CITY OFSANTAANA SANTA ANA BOULEVARD GRADE SEPARATION MARK THOHAS potential to affect local carbon monoxide addressed in NEPA documents. It is assumed that (CO) concentrations using the California a quantitative analysis can be prepared. Department of Transportation CO Hotspot Climate Change/Greenhouse Gas Emissions. A Protocol. It is anticipated that the CO quantification of operational-period greenhouse screening procedure will be appropriate, gas (GHG) emissions associated with and that CALINE-4 dispersion modeling will implementation of the proposed project will be not be required. conducted. Operations-period GHG emissions will • Localized PM2.VPM10 Hot Spot Analysis. be quantified using regional daily VMT; and current The PM Hot Spot Analysis will assess the EMFAC emissions factors. ICF will present a degree to which project-related traffic comparison of GHG emissions under the Build volumes have a potential to affect local Alternatives and the No-build Alternative to PM2.5 and PM,o concentrations. ICF will characterize effects of the proposed project on prepare the required PM Conformity GHG emissions. The analysis of climate change documentation and submit to Caltrans for will also incorporate the most recent guidance review and approval. Caltrans will then found on the Caltrans Standard Environmental forward the documentation to the SCAG Reference (SER) and Caltrans annotated outline. Transportation Conformity Working Group Construction GHG emissions will be quantified (TCWG). ICF will lead the TCWG using the Road Construction Emissions Model interagency consultation on behalf of the integrated into the CaIEEMod model. Project Sponsor. Based on our review of the proposed Project Description, it is Mitigation Measures. ICF will develop mitigation assumed that the project will not be measures, where applicable, to address significant considered a Project of Air Quality Concern air quality impacts, if present. (POAQC), and that a screening-level PM g. 4 Supplemental Noise Study Report conformity analysis will be sufficient. Due to the change in the Project design (reduction Evaluation of Construction-Period Emissions. A in number of lanes, etc.), the updated traffic study quantitative construction analysis will be performed that will be prepared, and the presence of new #o evaluate regional and localized mass developments with noise sensitive receptors that emissions. Based on preliminary construction have been constructed since the previous NSR scheduling and phasing information, construction was approved, a Supplemental Noise Study emissions will be quantified using the Road Report (SNSR)will be prepared. It is assumed the Construction Emissions Model integrated into the previously prepared NSR will be redone in its CaIEEMod model. entirety since it was prepared using an outdated Evaluation of Operations-Period Mass Emissions. version of TNM, was based on the old Caltrans Regional criteria pollutant emissions will be Noise Protocol, and does not meet current quantified using project-level vehicle miles traveled requirements. The SNSR will be prepared (VMT) and current EMFAC emissions factors. In consistent with the guidance included in Caltrans' order to accomplish this scope item, ICF must Protocol and Caltrans' Technical Noise receive project-level VMT for existing condition, Supplement. no-build condition for the opening year and horizon ICF noise staff will identify noise sensitive land year, and build alternative conditions for the uses and other features using platforms such as opening year and horizon year for each build Google Earth prior to the field survey. ICF will alternative. consult with the Caltrans District 12 noise Mobile Source Air Toxics. Evaluate proposed specialist (if necessary) assigned to this project to project-related mobile source air toxics (MSATs) ensure that all requirements are addressed. ICF emissions in accordance with FHWA updated will also prepare a Noise Work Plan for Caltrans interim guidance on how MSATs should be review and approval prior to initiating the noise work.