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spring, summer, and early fall. However, PMIO generated from construction-related activities is highly dependent on several factors, including activity level, specific operations, equipment type, and weather conditions. BAAQMD considers PMIO emissions to be the greatest pollutant of concern associated with construction activities and has, therefore, established feasible control measures for PMlO emissions from construction-related activities. Control "measures are based on the size of the construction project. The implementation of basic control measures would apply to all construction projects. Project sizes that are greater than four acres would be subject to the enhanced control measures. BAAQMD further recommends that optional control measures be implemented at construction areas that are large in area, located near sensitive receptors, or may for any other reason be warranted. PMlO emissions from construction-related activities would constitute a significant impact sincethe emissions would impair short-term air quality and could affect nearby residents and other sensitive receptors located downwind from the construction project. Increased dust fall may create a nuisance for nearby residents and potentially exacerbate chronic respiratory problems of those persons exposed to construction activities. PMlO impacts resulting from construction activities are not considered significant if construction control mitigation measures listed in the BAAQMD guidelines are incorporated (BAAQMD, 1999). The project would also result in short -term localized air emissions during these grading and drilling activities, including a temporary increase in localized particulate matter (PMlO) emissions. The Bay Area Air Quality Management District considers PMlO emissions to be the greatest pollutant of concern associated with construction activities and has, therefore, established feasible control measures for PMlO emissions from construction-related activities. Air quality effects resulting from construction activities would be considered significant if feasible construction control mitigation measures, listed in the Bay Area Air Quality Management District CEQA Guidelines (BAAQMD, 1996), were not incorporated. PMlO emissions from construction-related activities could create a nuisance to any nearby residences, park users, and workers. There are few residences adjacent to the site, and particulate emissions would not be expected to be a significant impact to park users or workers employed in industrial uses more than 1,000 feet (304.8 meters) away. There are no sensitive receptors (e.g., schools, hospitals, or significant groups of residences) within 1,000 feet (304.8 meters) of the project site. The heavy equipment that would be required for the project includes two cranes and two generators used during the entire construction period; one pile driver, used for approximately eight weeks; and a drill machine, paving machine, and two rollers used for shorter period of time. Exhaust from construction equipment and, possibly, barges, would generate short-term exhaust emissions, including reactive organic gases (RaGs), carbon monoxide (CO), and nitrogen oxides (NOx). Any asphalt paving for the trail would generate hydrocarbons, particulates, NOx, and CO emissions. Exhaust emissions from construction equipment would not be expected to result in violations of air quality standards because only a few pieces of equipment would be used at a time due to the size and nature of the project, and air emissions would be distributed throughout the extent of the construction period of approximately four months. Y4204IS.00693.doc - 4/5/07 -11-