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Separate analyses were conducted for both the Conventional /Density Neutral and Neo- <br />Traditional design scenarios. Projections for the Conventional and Open Space designs were <br />done together because the two have nearly identical traffic flows. Because the transportation <br />capacity analysis indicated that the existing NC 10 and New Hope Church intersection would <br />operate under capacity in the Conventional and Open Space designs, the intersection was <br />modeled as an unsignalized intersection, as it currently exists. However the air quality <br />impacts of the Neo- traditional design were modeled as a signalized intersection, as proposed <br />by the transportation capacity analysis. <br />Findings <br />The analysis indicates that carbon monoxide concentrations at the NC 10 and New Hope <br />Church intersection will be well within EPA's standards for acceptable air quality under both <br />design scenarios. The findings of this analysis are presented below: <br />Co��c ntrations <br />EPA Standards <br />Conventional\ ®pen <br />Neo- Traditional <br />Space <br />(in ppm) <br />1 hour <br />35 <br />2.4 -2.7 <br />2.7 -3.2 <br />8hour <br />9 <br />1.8 -2.0 <br />2.0 -2.4 <br />As demonstrated by these results, none of the development scenarios will have significant <br />adverse impacts upon the air quality at this intersection. Because of its central location and <br />its proximity to proposed commercial and residential development, the air quality at this <br />intersection is representative of the air quality impacts throughout the entire area. Even with <br />slightly higher levels of traffic, it seems unlikely that carbon monoxide concentrations will <br />exceed federal standards. <br />