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SCOPE OF SERVICES potential to affect 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, and that CALINE-4 dispersion modeling will not be required. Localized PM2.VPM10 Hot Spot Analysis. The PM Hot Spot Analysis will assess the degree to which project -related traffic volumes have a potential to affect local PM2.5 and PM,o concentrations. ICF will prepare the required PM Conformity documentation and submit to Caltrans for review and approval. Caltrans will then forward the documentation to the SCAG Transportation Conformity Working Group (TCWG). ICF will lead the TCWG interagency consultation on behalf of the Project Sponsor. Based on our review of the proposed Project Description, it is assumed that the project will not be considered a Project of Air Quality Concern (POAQC), and that a screening -level PM conformity analysis will be sufficient. Evaluation of Construction -Period Emissions. A quantitative construction analysis will be performed to evaluate regional and localized mass emissions. Based on preliminary construction scheduling and phasing information, construction emissions will be quantified using the Road Construction Emissions Model integrated into the CaIEEMod model. Evaluation of Operations -Period Mass Emissions. Regional criteria pollutant emissions will be quantified using project -level vehicle miles traveled (VMT) and current EMFAC emissions factors. In order to accomplish this scope item, ICF must receive project -level VMT for existing condition, no -build condition for the opening year and horizon year, and build alternative conditions for the opening year and horizon year for each build alternative. Mobile Source Air Toxics. Evaluate proposed project -related mobile source air toxics (MSATs) emissions in accordance with FHWA updated interim guidance on how MSATs should be CITY OF SANTA ANA SANTA ANA BOULEVARD GRADE SEPARATION HARK TH OHAS addressed in NEPA documents. It is assumed that a quantitative analysis can be prepared. Climate Change/Greenhouse Gas Emissions. A quantification of operational -period greenhouse gas (GHG) emissions associated with implementation of the proposed project will be conducted. Operations -period GHG emissions will be quantified using regional daily VMT; and current EMFAC emissions factors. ICF will present a comparison of GHG emissions under the Build Alternatives and the No -build Alternative to characterize effects of the proposed project on GHG emissions. The analysis of climate change will also incorporate the most recent guidance found on the Caltrans Standard Environmental Reference (SER) and Caltrans annotated outline. Construction GHG emissions will be quantified using the Road Construction Emissions Model integrated into the CaIEEMod model. Mitigation Measures. ICF will develop mitigation measures, where applicable, to address significant air quality impacts, if present. 6.3.4 Supplemental Noise Study Report Due to the change in the Project design (reduction in number of lanes, etc.), the updated traffic study that will be prepared, and the presence of new developments with noise sensitive receptors that have been constructed since the previous NSR was approved, a Supplemental Noise Study Report (SNSR) will be prepared. It is assumed the previously prepared NSR will be redone in its entirety since it was prepared using an outdated version of TNM, was based on the old Caltrans Noise Protocol, and does not meet current requirements. The SNSR will be prepared consistent with the guidance included in Caltrans' Protocol and Caltrans' Technical Noise Supplement. ICF noise staff will identify noise sensitive land uses and other features using platforms such as Google Earth prior to the field survey. ICF will consult with the Caltrans District 12 noise specialist (if necessary) assigned to this project to ensure that all requirements are addressed. ICF will also prepare a Noise Work Plan for Caltrans review and approval prior to initiating the noise work.