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4.8 Noise <br />Noise Levels in dBA CNEL at 50 feet <br />Increase <br />with Project <br />Yeor2030 <br />Year203O <br />over <br />Exceeds <br />Existing <br />Without Project <br />With Project <br />Existing <br />Project <br />Significance <br />Significance <br />Roadway Segment <br />Conditions <br />Traffic Volumes <br />Traffic Volumes <br />Conditions <br />Contribution <br />Threshold- <br />Threshold? <br />Santa Ana Blvd -East <br />of 1-5 SB Ramps <br />67.7 <br />68.2 <br />68.9 <br />1.2 <br />0.7 <br />3.0 <br />No <br />17th St -West of 1-5 <br />NB Ramps <br />74.4 <br />74.8 <br />74.8 <br />0.4 <br />0.0 <br />3.0 <br />No <br />17th St -East of 1-5 <br />73.4 <br />73.8 <br />73.8 <br />0.4 <br />0.0 <br />3.0 <br />No <br />INS Ramps <br />Grand Ave -South of <br />73.0 <br />73.5 <br />73.8 <br />0.8 <br />0.3 <br />3.0 <br />No <br />1-5 NB Ramps <br />Grand Ave-Nofth of <br />72.7 <br />73.2 <br />73.3 <br />0.6 <br />0.1 <br />3.0 <br />No <br />1-5 NB Ramps <br />SOURCE: PSS&J, 2010 (calculation data and results are provided in Appendix F). <br />a. Significance Thresholds are set as follows: <br />5.0 dBA CNEL if the noise increase is below the City of Santa Ana standard of 65 dBA CNEL <br />3.0 dBA CNEL if the noise Increase meets or exceeds the City of Santa Ana standard of 65 dBA CNEL <br />Similarly, Table 4.8-12 (Traffic Noise Impacts for Year 2035) compares long-term (2035) conditions with <br />the project to existing conditions to identify the overall change in future noise levels along study area <br />roadway segments. In addition, Table 4.8-12 also compares long-term (2035) with project conditions to <br />long-term (2035) without project conditions to determine the project's contribution to changes in noise <br />levels along study area roadway segments. <br />Noise Levels in dBA CNEL at 50 feet <br />Increase <br />with Project <br />Year2035 <br />Year 2035 <br />over <br />Exceeds <br />Existing <br />Without Project <br />With Project <br />Existing <br />Project <br />Significance <br />Significance <br />Roadway Segment <br />Conditions <br />Traffic Volumes <br />Traffic Volumes <br />Conditions <br />Contribution <br />Threshold- <br />Threshold? <br />Flower Street - <br />Santa Ana Blvd to <br />67.6 <br />68.8 <br />68.8 <br />1.2 <br />0.0 <br />3.0 <br />No <br />Civic Center Dr <br />Flower Street-17th <br />67.5 <br />68.5 <br />68.6 <br />1.1 <br />0.1 <br />3.0 <br />No <br />St to Civic Center Dr <br />Civic Center Dr- <br />67.6 <br />68.6 <br />68.8 <br />1.2 <br />0.2 <br />3.0 <br />No <br />West of Flower St <br />Civic Center Dr - <br />67.3 <br />68.4 <br />68.7 <br />1.4 <br />0.3 <br />3.0 <br />No <br />Flower St to Ross St <br />Flower Street - <br />Santa Ana Blvd to <br />67.6 <br />69.2 <br />69.2 <br />1.6 <br />0.0 <br />3.0 <br />No <br />1 st St <br />City of Santa Ana Transit Zoning Code (SD 84A and SD 848) EIR 4.8-31 <br />