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AIR QUALITY 1 · ENVIRONMENTAL EFFECTS Short-Term Temporary air quality impacts will result from project construction activities. Air pollutants will be emitted by construction equipment and vehicles, and dust will be generated during grading and site preparation. At this time, construction impacts upon air quality are difficult to quantify. Complete data regarding the amount and types of construction equipment to be used for this project (as well as the days of operation during project construction) are not available. Thus, estimates were employed when attempting to quantify this impact. A diesel-powered scraper is the most common type of equipment used for grading operations. For this type of project, four pieces of heavy equipment may be expected to operate at one time. If all the equipment operates for 8 hours per day, the following construction-related emissions would result: 30 pounds per day of carbon monoxide, 80 pounds per day of nitrogen oxides, 6 pounds per day of hydrocarbons, 10 pounds per day of sulfur oxides, and approximately 7 pounds per day of particulate matter. Lonq-term The main source of regional emissions generated by the project will be from motor vehicles. Estimates were made of the vehicular emissions that would be generated by the proposed project. The traffic report for the project forecasts 34,236 vehicle trips per day at an average trip length of ten miles. An average vehicle speed of 25 miles per hour was assumed for the projections. The following traffic-related emissions would result: 2.32 pounds per day of carbon monoxide, 0.42 pounds per day of nitrogen oxide, 0.09 pounds per day of sulfur oxide, 0.10 pounds per day of particulates, and 0.20 pounds per day of hydrocarbons. Emissions will be generated on-site by the combustion of natural gas for space heating and water heating. Off-site emissions will be generated due to electrical usage. The generation of electrical energy by the combustion of fossil fuels results in additional emissions off-site, some businesses may locate within the site which have processes that generate emissions in addition to those listed above. Information is not available regarding the type of firms that might locate in the Main Street Concourse and what types of equipment may be installed; therefore, projections of process emissions is not possible. However, these emissions will be regulated and controlled through the SCAQMD. As indicated above, the main source of emissions generated by the project will be from motor vehicles. Other sources of emissions will be natural gas combustion for space heating, electrical 9