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Summary of Impacts <br />operation would produce emissions of criteria pollutants including carbon monoxide and <br />nitrogen oxides. These impacts during demolition would be short-term and would not interfere <br />with attainment or maintenance of long-term air quality standards. , <br />Courthouse construction would also result in temporary increases in criteria pollutants and dust. <br />Air quality impacts would occur through emissions of carbon monoxide, nitrogen oxides, <br />.hydrocarbons and. other particulates from heavy equipment, and fugitive dust from construction <br />and earth-moving activities. In addition to the mobile equipment, diesel-powered cranes, <br />generators, and compressors would likely be used during construction. <br />Emissions of criteria pollutants from heavy machinery operation during construction would <br />create short-term impacts that would not interfere with attainment or maintenance of long-term <br />air quality standards. Construction activities at the project site could produce approximately 1.2 <br />tons of airborne particulates per month (or approximately 8 to 10 pounds per hour), depending on <br />the length of the construction day. Activities required later in the construction process, such as <br />framing and interior construction, would not produce significant amounts of airborne <br />particulates. All particulate emissions from construction activities would be temporary and <br />would not interfere with attainment or maintenance of air quality standards. <br />During operation of the new courthouse facility, minimal increases in airborne particulates from <br />traffic in and around the site could be expected. Potential impacts from these sources would also <br />be of short duration and would not interfere with attainment status or maintenance of long-term <br />air quality standards. With a parking capacity limited to 80 vehicles, sources of vehicle <br />emissions would be minimal at any of the alternative sites. If additional surface parking is <br />provided, vehicle emissions would increase, although not to a level of significance. <br />Noise <br />Demolition at the selected site and building construction activities could temporarily increase <br />noise levels in the vicinity of the project. While these construction impacts would occur for only <br />two years, they could be significant for nearby residences and parks during the construction <br />phase. <br />Noise impacts during construction are likely to be more serious for existing residences and park <br />activities near the Riverfront site in Springfield than for the vicinity of the Chiquita site in <br />Eugene. Construction equipment typically produces noise levels ranging from 60 to 90 decibels <br />at a distance of 50 feet from the noise source. Construction equipment noise levels typically <br />would range 20 to 30 decibels higher than ambient noise levels in the vicinity of the proposed <br />courthouse. During the construction phase, the GSA would implement its standard construction <br />procedures, which require that noise limits be placed on the operation of heavy equipment. The <br />GSA general construction procedures allow the noise from some equipment to exceed the city's <br />noise limit. <br />Final EIS l0 New Federal Courthouse <br />