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<br />in 1980/81, they are still considered a precursor to ozone and, <br />t;berefore, will be included in this assessment. <br /> <br />**Since precursors to photochemical oxidants are not significantly <br />impacted by forecast aircraft emissions and no significant sources <br />(stationary or mobile) are in the area, the relative impact of <br />estimated year 2005 emissions on the ~ is considered negligible. <br /> <br />***Due to the use of low lead fuel in virtually all piston driven <br />aircraft and the absence of lead in jet fuel, lead emissions produced <br />from general aviatiem aircraft operations are considered negligible. <br /> <br />* <br /> <br />* <br /> <br />* <br /> <br />'!be prima:ty source of emission data utilized in computing projected <br />aircraft emission concentrations is "Compilation of Air Pollutant <br />Emissions Factors", Second Edition, u.s. Environmental Protection <br />Agency, April, 1973. Table 8.l, Summary of Air Pollutant Impacts, <br />canpares what effects aircraft emission levels (computed utilizing the <br />year 2005 activity levels) will have on the National Ambient Air <br />Quality Standards. As shown, emissions produced by increased aircraft <br />activity do not contribute significantly to these values. It must, <br />therefore, be assumed pollutants produced by projected aircraft <br />activity will have an insignificant impact on the air quality <br />envi.J::oonent. <br /> <br />Studies further indicate that the limited number of other mobile and <br />stationmy emission sources related to the operation and service of <br />the proposed facility (airport access traffic, ground service <br />vehicles, terminal heatinq and air conditioning facilities, fuel <br />storage and hzmdling, etc.) will have no noticeable impacts on the air <br />quality environment. <br /> <br />During construction of the proposed airport improvements, air <br />pollution will be minimized by requiring adherence to provisions of <br />FAA Advisory Circular 150/5370-10, "Standards for Specifying <br />Ca1structicn of Airports", Item p-l56. <br /> <br />CUtdcor burning will not be allowed or permitted during construction <br />of the proposed airport development without a written grant from the <br />Texas Air Caltxol Board or the Executive Director. <br /> <br />1IIIt8r QJl!l1it.y <br /> <br />Generally, drainage at the airport sites flow south and eastward, <br />crossing no known biologically sensitive areas such as wildlife <br />management areas, etc. The construction of the runways, taxiways, <br />~s roadways and other paved areas will require the construction of <br /> <br />8.9 <br />