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S` 1.Approach and Scope of Work • Identify applicable regulations and significance criteria for air quality. Additional significance thresholds not contained in the SJVAPCD CEQA i Guide will be derived from the CEQA guides of other air districts and SJVAPCD Rules and Regulations.CARB and U.S. Environmental Protection Agency(EPA)regulations may also be utilized for the I establishment of significance thresholds. • Describe the ambient air quality standards established by CARB and the U.S.EPA.Ambient air quality standards will be summarized in a concise table. • Describe the existing air quality conditions including seasonal variations. Existing(historical) ambient air quality data over the most recently available four-year period will be obtained from GARB. Existing air quality will be summarized in a concise table. The attainment status of each pollutant will also be provided. • A key issue that will need to be evaluated here is the treatment of existing truck-based cargo transportation that will be displaced by rail transportation if the project is constructed. Analyze Initial and Future Scenarios • Characterize the level of impact for project conditions using levels of significance established by the jurisdiction in which the impacted area is located. Construction and operational emissions(to the extent applicable) will be quantified using the URBEMIS 2007 software package. Project- specific trip generation data, activity,emission factors, and load factors will be used for source categories not covered by URBEMIS. It is expected that the latter approach will be used for all locomotive-related activities, on-site cargo handling activities,and truck trips to and from 4 the facility. • Evaluate the potential for cumulative impacts from the project combined with other closely related past,present, and foreseeable future projects. 4 I • Prepare a screening level health risk assessment(HRA)of diesel particulate matter exhaust impacts from the project according to the methodology of the California Office of Environmental Health Hazard Assessment's(OEHHA's)publication,Air Toxics Hot Spots Program Risk Assessment Guidelines. • Incorporate the potential impact of greenhouse gas emissions generated by the project in the cumulative impacts analysis, including quantifying potential greenhouse gas emissions.The State of California has adopted targeted goals for reducing greenhouses gases through Assembly Bill 32 (the California Global Warming Solutions Act of 2006) and Executive Orders S-3-05 and S-01-07. Greenhouse gas emissions will be quantified using URBEMIS 2007, to the extent applicable,with methane and nitrous oxide emissions quantified using emission factors contained in Appendix A of CARB's Regulation i San Joaquin County—i=1R for the Union Pacirrc Modernization Project -�