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City of Santa Ana Proposal for 601 North Parkcenter Drive [a Initial Study and Mitigated Negative Declaration Air Quality Traffic Assessment & Acoustical Traffic Assessment. This scope of work assumes the traffic analysis will provide supplemental information to support air quality and acoustical analyses. Meetings. This scope of work assumes RBF's Transportation Division will attend one kickoff meeting with agency staff to discuss/review the traffic impact analysis and up to one additional meeting/hearing. 3.5 AIR QUALITY - The City of Santa Ana is located within the South Coast Air Basin, which is regulated by the South Coast Air Quality Management District (SCAQMD). RBF will describe the meteorological conditions and discuss ambient air monitoring data collected for the nearest monitoring station. A description of the regulatory framework relating to air quality (i.e., California Clean Air Act, Air Quality Management Plan, etc.) will also be provided. Construction -Related Emissions. Equipment exhaust and fugitive dust emissions resulting from construction activities will be quantified using URBEMIS2007. Based on landform/grading/demolition/excavation data and assumptions provided by the project Applicant (i.e., number/type of equipment needed for grading activities, project phasing, etc.), the analysis will estimate equipment exhaust emissions utilizing the latest emission factors as prescribed by the California Air Resources Board (CARB) and the EMFAC2007 Model. Emissions from soil hauling activities will also be quantified, if necessary. Fugitive dust emissions will be quantified based on the number of acres to be graded per day. Construction pollutant emissions will be compared to SCAQMD thresholds and mitigation measures will be recommended to reduce the significance of emissions, where feasible. RBF will also qualitatively discuss naturally occurring asbestos impacts as they relate to the proposed construction activities. Construction Related Diesel Particulates. The construction of the proposed project is expected to result in increased concentrations of one or more toxic air contaminants (TAC), potentially exposing existing nearby residents to the proposed : project. There are currently no federal project -level requirements for air toxics analysis, and CEQA only requires a consideration of the risks from toxics. However, the Office of Environmental Health Hazard Assessment (OEHHA) provides the Air Toxics Hot Spots Program Risk Assessment Guidelines (August 2003) and SCAQMD provides the Supplemental Guidelines for Preparing Risk Assessments for the Air Toxics "Hot Spots" Information and Assessment Act (AB2588) (July 2005) and the Health Risk Assessment Guidance forAnalyzing Cancer Risks from Mobile Source Diesel Idling Emissions for CEQA Air Quality Analysis (August 2003) for guidance. A screening level assessment will be conducted following these guidelines. For this project, the principle source of TAC during construction is expected to be the diesel -powered construction equipment. The only TAC of concern is expected to be diesel particulate. i1 iy JN 10-105908 • 9 August 8, 2007