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4.8 Noise <br />anticipated growth that is expected in conjunction with buildout of the City of Santa Ana General Plan <br />land uses and circulation element. <br />Table 4.8-11 compares near -term (2030) conditions with the project to existing conditions to identify the <br />overall change in future noise levels along study area roadway segments. As discussed previously, a <br />difference of 3.0 dBA between 24-hour noise levels is a barely perceptible increase to most people. A <br />5.0 dBA increase is readily noticeable, and a difference of 10 dBA would be perceived as a doubling of <br />loudness. Existing traffic noise levels are identified in Table 4.8-4. Noise levels associated with traffic <br />generated from existing conditions within the proposed project area were calculated along study -area <br />roadway segments using traffic data from the traffic study (included in Appendix G). In addition, <br />Table 4.8-10 (Traffic Noise Impacts for Year 2030) also compares near -term (2030) with project <br />conditions to near -term (2030) without project conditions to determine the project's contribution to <br />changes in noise levels along study area roadway segments. <br />Noise Levels In dBA CNEL at 50 feet <br />Increase <br />with Project <br />Year 2030 <br />Year 2030 <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 _.._7raific <br />Volumes <br />-TraRc Volumes <br />Conditions <br />Conidbution <br />Threshold= - <br />Threshold? <br />Flower Street -Santa <br />Ana Blvd to Civic <br />67.6 <br />68.2 <br />68.2 <br />0.6 <br />0.0 <br />3.0 <br />No <br />Center Dr <br />Flower Street-17th <br />St to Civic Center Dr <br />67.5 <br />67.9 <br />68.0 <br />0.5 <br />0.1 <br />3.0 <br />No <br />Civic Center Dr- <br />West of Flower St <br />67.6 <br />68.1 <br />68.3 <br />0.7 <br />0.2 <br />3.0 <br />No <br />Civic Center Dr - <br />67.3 <br />67.8 <br />68.1 <br />0.8 <br />0.3 <br />3.0 <br />No <br />Flower St to Ross St <br />Flower Street -Santa <br />67.6 <br />68.2 <br />68.3 <br />0.7 <br />0.1 <br />3.0 <br />No <br />Ana Blvd to 1st St <br />Santa Ana Blvd- <br />63.8 <br />64.2 <br />64.6 <br />0.8 <br />0.4 <br />5.0 <br />No <br />West of Flower St <br />Santa Ana Blvd- <br />64.7 <br />65.1 <br />65.6 <br />0.9 <br />0.5 <br />5.0 <br />No <br />Flower St to Parton St <br />Santa Ana Blvd- <br />64.7 <br />65.1 <br />65.6 <br />0.9 <br />0.5 <br />5.0 <br />No <br />Parton St to Ross St <br />Civic Center Dr - <br />66.8 <br />67.4 <br />67.8 <br />1.0 <br />0.4 <br />3.0 <br />No <br />Ross St to Broadway <br />Santa Ana Blvd - <br />64.4 <br />64.9 <br />65.4 <br />1.0 <br />0.5 <br />5.0 <br />No <br />Ross St to Broadway <br />Broadway -Civic <br />Center Dr to Santa <br />67.7 <br />68.3 <br />68.3 <br />0.6 <br />0.0 <br />3.0 <br />No <br />Ana Blvd <br />City of Santa Ana Transit Zoning Code (SD 84A and SD 84B) EIR 4.8-27 <br />