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CW of Santa Ana -Park View at Town and Country Manor <br />Draft EIR <br />Table 4.2.10: Carbon Monoxide Concentrations (Opening Year, 2013) <br />1 Hour Estimated <br />8 Hour Estimated <br />8 Hour Estimated <br />CO Concentration <br />CO Concentration <br />Significant <br />Intersection (ppm)* <br />(ppm) ** <br />Impact ?* <br />Main Street at La Veta Avenue 7.2 <br />4.5 <br />No <br />Parker Street at La Veta Avenue <br />6.1 <br />3.7 <br />No <br />Main Street / Edgewood Road at I -5 NB Off- <br />6.4 <br />3.9 <br />No <br />Ramp / I -5 HOV Ramps <br />5.4 <br />3.2 <br />No <br />Main Street / I -5 SB Off -Ramp at Santa Clam <br />6.6 <br />4.0 <br />No <br />Avenue / I -5 NB On -Ramp <br />• Caline4 output plus the 1 hour background concentration of 5 ppm. <br />5.5 <br />3.3 <br />• • The 8 -hour project increment was calculated by multiplying the 1 -hour Caline4 output by 0.7 (persistence <br />factor), <br />then adding the 8 hour background concentration of 2.91 ppm. <br />• •• Comparison of the 1 -hour concentration to the state standard of 20 ppm and the 8 -hour concentration <br />to the <br />state /national standard of 9 ppm. <br />• • The 8 -hour project increment was calculated by multiplying the 1 -hour Caline4 output by 0.7 (persistence <br />factor), <br />Source: Michael Brandman Associates, Air Quality Analysis Report, 2009. <br />Table 4.2 -11: Carbon Monoxide Concentrations (General Plan Buildout, 2030) <br />Level of Significance Before Mitigation <br />Less than significant. <br />Mitigation Measures <br />No mitigation measures required. <br />Level of Significance After Mitigation <br />Less than significant. <br />4.2 -22 Michael Brandman Associates <br />H\Cl t(PN- JMb327b327003MMVB270030 Se 4GAvQ ity.D <br />1 Hour Estimated <br />8 Hour Estimated <br />CO Concentration <br />CO Concentration <br />Significant <br />Intersection <br />(ppm)* <br />(ppm) ** <br />Impact ?* <br />La Veta Avenue/Parker Street <br />5.6 <br />3.3 <br />No <br />Town & Country Road/Parker Street <br />5.4 <br />3.2 <br />No <br />Town & Country Road/SR -22 EB Ramps <br />5.4 <br />3.2 <br />No <br />Main Street/1-5 NB Off- Ramp/Edgewood <br />5.4 <br />3.2 <br />No <br />Road/1-5 HOV Ramps <br />Main Street/1-5 SB Off-Ramp/Santa Clam <br />5.5 <br />3.3 <br />No <br />Avenue/1-5 NB On -Ramp <br />• Caline4 output plus the 1 hour background concentration of 5 ppm. <br />• • The 8 -hour project increment was calculated by multiplying the 1 -hour Caline4 output by 0.7 (persistence <br />factor), <br />then adding the 8 hour background concentration of 2.91 ppm. <br />• •• Comparison of the 1 -hour concentration to the state standard of 20 ppm and the 8 -hour concentration <br />to the <br />state /national standard of 9 ppm. <br />Source: Michael Brandman Associates, Air Quality Analysis Report, 2009. <br />Level of Significance Before Mitigation <br />Less than significant. <br />Mitigation Measures <br />No mitigation measures required. <br />Level of Significance After Mitigation <br />Less than significant. <br />4.2 -22 Michael Brandman Associates <br />H\Cl t(PN- JMb327b327003MMVB270030 Se 4GAvQ ity.D <br />