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ENVIRONMENTAL IMPACT REPORTADDENDUM <br />Bristol Street Widening Phase HIS — Washington Avenue to 17`b Street <br />and would result in a beneficial impact on air pollutant emissions due to improvements in operational <br />phase efficiencies along Project roadway segments for the 2015 Project opening year. <br />Emissions occurring during the 2035 design year were also quantified based on the LOS, average vehicle <br />speed and emission rates that would occur with and without the proposed Project. As shown in Table 4, <br />air pollutant emissions occurring under the With- Project Alternative would be less than under the No <br />Project Alternative due to lower emission rates associated with higher average speeds. Consequently, the <br />Proposed Project for the 2035 Project design year would likewise result in emissions which are below the <br />SCAQMD's significance thresholds and would result in a beneficial impact relative to greenhouse gas <br />(GHG) emissions due to improvements in operational phase efficiencies along Project roadway segments. <br />Mitigation Measures <br />No additional new mitigation measures are required. <br />TABLE 3 YEAR 2015 WITH AND <br />EMISSIONS <br />Bristol Street Between <br />Seventeenth Street and 13 82 6 14 0 2 2 <br />Washington Avenue <br />Year 2015 with Project <br />Bristol Street Between <br />Seventeenth Street and 25 62 3 11 0 1 1 <br />Washington Avenue <br />Difference between No Project and with Project Emissions <br />Bristol Street Between <br />Seventeenth Street and -20 -3 -3 0 -1 -1 <br />Washington Avenue <br />SCAQMD Significance <br />Thresholds 550 55 55 150 150 55 <br />Exceeds Thresholds No No No No No No <br />Source: Air Quality Assessment Report (URS 2013a). <br />Notes: mph = miles per hour; CO = carbon monoxide; ROG = reactive organic gases; NOx = nitrogen oxides; S02 = sulfur dioxide; PMro = <br />particulate matter less than less than or equal to 10 microns in diameter; PM2.5 = particulate matter less than less than or equal to 2.5 microns <br />in diameter. <br />TABLE 4 YEAR 2035 WITH AND WITHOUT PROJECT AIR POLLUTANT EMISSIONS <br />ROADWAY AVERAGE <br />INTERSECTION VEHICLE CO ROG NO, S02 PM10 PMzs <br />SPEED <br />Year 2035 No Project <br />Bristol Street Between <br />Seventeenth Street and 13 42 3 7 0 3 2 <br />Washington Avenue <br />Year 2035 with <br />Bristol Street Between <br />Seventeenth Street and 15 39 3 6 0 2 2 <br />Washington Avenue <br />ANA 11 t -334 (PER- 02 -01) CITY OF SANTA ANA (01/30/2014 REV3) 132897 CM PAGE 25 <br />55A -34 <br />