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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 />1-Hour Average (ppm) <br />Modeled <br />Background <br />Total <br />Concentration <br />wind Angle <br />Highway 10 & Armstrong Blvd. <br />Receptor 1 <br />6.8 <br />2.6 <br />9.4 <br />100 <br />Receptor 2 <br />6.1 <br />2.6 <br />8.7 <br />120 <br />Receptor 3 <br />7.6 <br />2.6 <br />10.2 <br />10 <br />Receptor 4 <br />6.6 <br />2.6 <br />9.2 <br />350 <br />Receptor 5 <br />2.6 <br />2.6 <br />5.2 <br />260 <br />Receptor 6 <br />2.6 <br />2.6 <br />5.2 <br />210 <br />Receptor 7 <br />2.1 <br />2.6 <br />4.7 <br />230 <br />Receptor 8 <br />3.9 <br />2.6 <br />6.5 <br />160 <br />Highway 10 & Ramsey Blvd. <br />Receptor 9 <br />6.5 <br />2.6 <br />9.1 <br />100 <br />Receptor 10 <br />5.8 <br />2.6 <br />8.4 <br />260 <br />Receptor 11 <br />8.0 <br />2.6 <br />10.6 <br />10 <br />Receptor 12 <br />6.3 <br />2.6 <br />8.9 <br />350 <br />Receptor 13 <br />2.4 <br />2.6 <br />5.0 <br />150 <br />Receptor 14 <br />3.2 <br />2.6 <br />5.8 <br />250 <br />Highway 10 & Sunfish Lake Blvd <br />Receptor 15 <br />8.8 <br />2.6 <br />11.4 <br />100 <br />Receptor 16 <br />7.6 <br />2.6 <br />10.2 <br />110 <br />Receptor 17 <br />7.2 <br />2.6 <br />9.8 <br />10 <br />Receptor 18 <br />6.1 <br />2.6 <br />8.7 <br />350 <br />Receptor 19 <br />3.3 <br />2.6 <br />5.8 <br />120 <br />Receptor 20 <br />3.5 <br />2.6 <br />6.1 <br />240 <br />State Standard <br />30.0 <br />Federal Standard <br />35.0 22-6 <br />