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intersection of Highway 10 and Sunfish Lake Boulevard. This is below the state and <br />national air quality standards of 30 ppm and 35 ppm respectively. <br />Table 22.6 lists the 2008P.M. peak eight -hour CO concentrations. These concentrations <br />were derived from the one -hour CO concentration results listed in Table 22.5. The <br />CAL3QHC dispersion model predicts one -hour CO concentrations only. These one -hour <br />concentrations are adjusted using a persistence factor. EPA recommends an eight -hour <br />persistence factor for urban areas of 0.7. The factor takes into account the fluctuations of <br />wind directions, temperatures, and traffic volumes that are likely to occur over eight <br />hours. The highest eight -hour CO concentration calculated was 7.9 ppm at Receptor 15 <br />at the intersection of Highway 10 and Sunfish Lake Boulevard. This is below both the <br />state and national air quality standards of 9 ppm. <br />Table 22.5: 2008 P.M. Peak Carbon Monoxide Modeling Results - 1 Hour <br />r <br />1-Hour Average (ppm) <br />Modeled <br />Highway 10 & Armstrong Blvd. <br />Receptor 1 <br />Receptor 2 <br />Receptor 3 <br />Receptor 4 <br />Receptor 5 <br />6.8 <br />6.1 <br />7.6 <br />6.6 <br />Background <br />Total <br />Concentration <br />2.6 <br />Receptor 6 <br />Receptor 7 <br />2.6 <br />2.1 <br />Receptor 8 3.9 <br />2.6 <br />2.6 <br />2.6 <br />2.6 <br />2.6 <br />2.6 <br />2.6 <br />2.6 <br />Wind Angle <br />9.4 100 <br />8.7 120 <br />10.2 10 <br />9.2 350 <br />5.2 260 <br />5.2 210 <br />4.7 230 <br />6.5 160 <br />Highway 10 & Ramsey Blvd. <br />Receptor 9 _ 6.5 2.6 9.1 100 <br />Receptor 10 5.8 2.6 8.4 260 <br />Receptor 11 8.0 2.6 10.6 10 <br />Receptor 12 _ 6.3 2.6 8.9 350 <br />Receptor 13 2.4 2.6 5.0 150 <br />Receptor 14 3.2 2.6 5.8 250 <br />Highway 10 & Sunfish Lake Blvd <br />Receptor 15 8.8 2.6 11.4 100 <br />Receptor 16 7.6 2.6 10.2 110 <br />Receptor 17 7.2 2.6 9.8 10 <br />Receptor 18 6.1 2.6 8.7 350 <br />Receptor 19 3.3 2.6 5.8 120 <br />Receptor 20 3.5 2.6 6.1 240 <br />State Standard 30.0 <br />Federal Standard 35.0 22-6 <br />