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<br />2004 <br /> <br />Highest I-Hour after completion <br />Highest 8-Hour after completion <br /> <br />5.7 ppm <br />4.7 ppm <br /> <br />The maximum CO concentrations include the I-hour and 8-hour background CO levels. <br /> <br />State CO standards are 30 ppm I-hour average and 9 ppm 8-hour average. <br /> <br />Noise: <br /> <br />Vehicles making trips to and from the site will generate additional noise. <br /> <br />Predictive Noise Levels (in dBA) <br /> <br />Daytime: <br /> <br />Daytime (7:00 a.m. to 10:00 p.m.) exterior noise levels within the project area are influenced by <br />vehicular traffic on adjacent and nearby roadways, and other sources typical of an urban <br />environment. Projected post-construction increases in vehicular traffic traveling to and from the <br />proposed site during daytime hours will result in average noise level increases of not more than <br />three decibels over the no-build noise levels. In comparison, the average human ear is incapable <br />of perceiving changes in a time-varying source (like traffic-generated noise) that are less than <br />three decibels. No significant daytime noise impacts are expected to occur as a result of the <br />project. <br /> <br />Additional noise will be generated during the construction phase of the project. Construction <br />phase noise impacts are expected to be nominal, short-term, and restricted to normal workday <br />hours. <br /> <br />Nighttime <br /> <br />Nighttime (10:00 p.m. to 7:00 a.m.) exterior noise levels within the project area are influenced by <br />vehicular traffic on adjacent and nearby roadways, and other sources typical of an urban <br />environment. Projected post-construction increases in noise levels during nighttime hours will <br />result in average noise levels increases of not more than three decibels over the no-build noise <br />levels. Because there are no significant amounts of vehicular traffic expected to access the site <br />during the nighttime hours, no significant nighttime noise impacts are expected to occur as a <br />result of the project except the existing noise levels from the nearby Interstate 35W. <br /> <br />c. BASIS FOR DRAFT PERMIT CONDITIONS <br /> <br />Contents of Special Conditions: <br /> <br />This permit contains standard Special Conditions. <br /> <br />3 <br />