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Appendix 1: AQ/HRA SOW Appendix 1 - Scope of Work for Greystar South Main Street Project (1304 and 1601 EI Camino Real) AQ/HRA Air Qualitv Analvsis Analysis Overview. AECOM will augment the analysis of criteria air pollutant, toxic air contaminant (TAC), and greenhouse gas (GHG) emission impacts underway for the South Main Street Mixed Use Project (aka 1601 EI Camino Real) by integrating the proposed offsite development of 38 residential units at 1304 EI Camino Real. Both project sites are located in the San Francisco Bay Area Air Basin (SFBAAB) and regulated at the regional level by the Bay Area Air Quality Management District (BAAQMD) and at the State and federal levels by the California Air Resources Board (ARB) and U.S. Environmental Protection Agency (EPA), respectively. BAAQMD attains and maintains air quality conditions in the SFBAAB through a comprehensive program of planning, regulation, enforcement, technical innovation, and promotion of the understanding of air quality issues. Construction of the project would generate emissions of criteria air pollutants, precursors, and TACs (e.g., diesel particulate matter) from off-road construction equipment, on -road vehicles, earthmoving activities, and off -gassing from paving activities. Construction emissions are dependent on the schedule and duration of construction phases, square footage of land uses to be developed, off-road construction equipment lists and activity schedules, volume of construction -related haul -truck and worker traffic, earthmoving activities (e.g., cut/fill, grading), and acres of asphalt paving. The air quality analysis of the project will account for construction activities at both 1601 and 1304 EI Camino Real. Long-term operations would generate emissions of criteria air pollutants, precursors, and TACs from a variety of stationary, area, and mobile sources. It is anticipated that the proposed project would install one emergency generator for each parcel containing office space. Area -source emissions would include consumer products, landscape maintenance equipment, and natural gas combustion. Mobile sources could include a variety of vehicles, including light-duty automobiles, heavy-duty trucks and buses. Operational impacts will address these sources at both the 1601 and 1304 EI Camino Real sites. The augmented analysis will evaluate the following: • Additional short-term construction and long-term operational criteria pollutant and GHG emissions associated with the development of 1304 EI Camino Real site, to be integrated with the ongoing analysis of 1601 EI Camino Real. For construction, mitigation measures in the form of Tier 4 equipment will be required for the HRA as discussed below. • Screening level health risk and hazard impacts of construction and operational emissions from the proposed project to the on-site and off-site receptors located within 1,000 feet of the project site, including both 1601 and 1304 EI Camino Real. For construction, a refined analysis will be required due to the proximity of sensitive receptors to heavy traffic volumes on EI Camino Real and Caltrain passbys, and mitigation measures in the form of Tier 4 equipment may be required. A refined analysis will be completed for operations should the screening analysis result in emissions above the thresholds. Analytical Tasks. Consultant will update the potential criteria pollutant and GHG emissions from construction and operational activities at 1601 EI Camino Real to include the activities at the 1304 EI Camino Real site. The analysis will include the additional emissions associated with stationary, area, energy consumption (e.g., indirect GHG emissions from the offsite generation of electricity), and mobile sources for the added parcel, resulting in new total emissions for the project. For 1304 EI Camino Real, Consultant will use the same air quality models proposed for 1601 EI Camino Real; i.e., the California Emissions Estimator Model (CalEEMod), Version 2016.3.2 and/or spreadsheet calculations using appropriate emission factor sources including, but ATTY/AGR/2019/AMENDMENTS/AMEND NO.1- AECOM REV: 06-17-19 PR Page 6 of 22