2014-028 - Approving General Plan Amendement No. 2014-01

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City of Santa Ana -Park View at Town and Country Manor Draft EIR Noise Standards, City noise standards provide the acceptable range of ambient noise levels for residential developments within the City. Exterior noise levels are normally compatible at 65 dB CNEL for residential uses. Noise Potential offsite traffic noise impacts created by the ongoing operations of the proposed project have been analyzed through utilization of the FI WA Traffic Noise Prediction Model FI WA- ROAD -77- 108, and the average daily traffic volumes obtained from the Traffic Impact Analysis (Appendix G of this EIR). Potential offsite noise impacts caused by an increase in vehicular traffic from project operations onto study area roadways have been analyzed for the following five traffic scenarios: • Existing: This scenario refers to the existing traffic noise conditions, without construction of the proposed project. • Year 2013 Baseline: This scenario refers to the future traffic noise conditions based on the existing conditions plus an area growth rate and traffic from nearby approved projects, without construction of the proposed project. • Year 2013 With Project: This scenario refers to the future traffic noise conditions based on the Year 2013 Background Baseline conditions plus the traffic generated from the on -going operations of the proposed project. • Year 2030 Baseline: This scenario refers to the future traffic noise conditions based on the General Plan buildout conditions for the Year 2030, without construction of the proposed project. • Year 2030 With Project: This scenario refers to the future traffic noise conditions based on the General Plan buildout conditions for the Year 2030, plus the traffic generated from the on- going operations of the proposed project. In order to quantify traffic noise impacts along the analyzed roadways, the roadway noise contours were calculated. Noise contours represent the distance to noise levels of a constant value and are measured from the center of the roadway. For analysis comparison purposes, the Ldn and CNEL noise levels are calculated at 50 feet from the centerline. In addition, the distance from the centerline to the 55, 60, 65, and 70 dBA noise levels are calculated for both Ldn and CNEL standards. Existing Conditions The noise contours of the nearby existing roadway have been calculated in order to provide a baseline of the existing traffic noise levels. The calculated existing noise contours are shown below in Table 4.5 -9 and Appendix E. Michael Brandman Associates 4.5 -19 H\Cl t(PN -Rn) 327b32]003MMVB2]0030 Sec01 Noi�.doc