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4. ENVIRONMENTAL ANALYSIS 4.6 Ant QUALITY — stagnant wintertime conditions. However,localized CO concentrations at congested intersections _ and freeway segments might be expected to be higher than the monitoring data,thereby creating local hot spots. The primary source of CO in the San Joaquin Valley is on-road motor vehicles, which account for approximately 68 percent of total CO emissions(GARB, 2003). Other sources include fireplaces, mobile sources (farm vehicles,trains,and ships)and waste burning(CARB, 2003). Sensitive Receptors Land uses such as schools, hospitals,and convalescent homes are considered to be sensitive to _ poor air quality conditions because infants, children,the elderly,and people with health afflictions(especially respiratory ailments)are more susceptible to respiratory infections and other air-quality-related health problems than the general public. Residential areas are also considered to be sensitive to air pollution because residents(including children and the elderly)tend to be at home for extended periods of time,resulting in sustained exposure to any pollutants present. 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. 4.6.3 IMPACTS AND MITIGATION MEASURES - Air quality impacts associated with build-out of the Proposed Project would primarily be associated with short-term construction and operation-related activities(aggregate processing, _ equipment on-site, and truck traffic). Project-related air quality impacts fall into two categories: fugitive dust impacts due to aggregate processing and concrete batching operations 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. Project-related air quality impacts were evaluated within the area consisting of the San Joaquin County. 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: 2007 and 2025. It is expected that the project could be fully initiated by 2007. Impacts in 2025 were assessed consistent with the future horizon year assessed for traffic. Cumulative impacts were evaluated both on a local and regional basis. RMC Pacific vemahs Qaany Mining and Reclamation Pmject 4.6-16 FSA i 203015 Administrative Dmft OR March 2004