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4.Environmental Analysis Properties surrounding the project area are used for agricultural crops, orchards, agriculture — composting,and mining activities. Two residences are located east of the project site on Koster Road. One is located about 600 feet west of the southern portion of the Phase V area of the project site. The other is located further south and is approximately 850 feet from the southwest comer of the project site. Another group of residences located south of Blewett Road and northeast of the project site, are approximately 100 feet from the property line. There are also some residences located along the proposed truck routes that provide access to the project site. The closest school to the project site is located on Welty Road, approximately 5,000 feet east of the project site, in Stanislaus County. 4.6.2 Impacts and Mitigation Measures Air quality impacts associated with build-out of the project would primarily result from short- term construction and operation-related activities(aggregate processing,concrete and asphalt batching operations,equipment on-site, and truck traffic). The air quality analysis presented in this EIR is based on maximum annual quarry production of 4 million tons of aggregate, 400,000 tons of asphalt concrete,and 150,400 tons of concrete.Project-related air quality impacts fall into two categories: fugitive dust impacts due to aggregate processing and concrete batching — operations(aggregate,concrete, and asphalt)and criteria pollutant impacts due to the increase in nonroad equipment and haul truck(on-and off-site)traffic as a part of the project operation. Fugitive dust emission sources also included unpaved roads, handling and storage, and wind erosion. The nonroad equipment, haul trucks, and the asphalt batch operations are also a source of TACs. Fugitive dust emission sources also included unpaved roads, handling and storage,and wind erosion. Emission changes were estimated for all sources affected by the project, including stationary and mobile sources.The detailed emission calculation assumptions and background data for emission sources are contained in Appendix D. For purposes of this analysis, two years were analyzed: 2008 and 2020. It is expected that the project could be fully initiated by 2008. Impacts in 2020 were also assessed to show how emissions would decrease over time, as the emission rates for mobile sources would decrease over time as the vehicle mix becomes more efficient.. Cumulative impacts were evaluated both on a local and regional basis. Emission factors were determined based on methodology found in publications and databases including U.S. EPA's Compilation of Air Pollutant Emission Factors (AP-42)and CARB — documentation for the aggregate processing,concrete batching, and other fugitive sources, CARB's OFFROAD emission model for offroad equipment, and EMFAC2002 for motor vehicles (such as haul trucks). Detailed information concerning the emission factors and other pertinent _ assumptions are contained in Appendix D. Significance Criteria According to the CEQA Guidelines, and the professional judgment of San Joaquin County Staff and their consultants, the project would be considered to have a significant air quality effect on the environment if it would: RMC Pacific vemalis Quarry Mining and Reclamation Project 4.6-16 ESA 1203015 Draft Environmental Impact Report May 2006