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<br />Legacy Sunflower Apartments Page 80 <br />Mitigated Negative Declaration – March 14, 2019 <br /> <br />Table 21 <br />Change in Existing Noise Levels Along Roadways as a Result of Project (dBA CNEL) <br /> <br />Roadway Segment <br />Distance <br />from <br />roadway <br />centerline <br />to right- <br />of-way <br />(feet)2 <br />Modeled Noise Levels (dBA CNEL) <br />Existing <br />Without <br />Project <br />at right- <br />of-way <br />Existing <br />Plus <br />Project <br />at right- <br />of-way <br />Change <br />in <br />Noise <br />Level <br />Exceeds <br />Standards <br />Increase of <br />3 dB or <br />More <br />Sunflower <br />Avenue <br />West of Flower <br />Street/Sakioka Drive 60 75.37 75.42 0.05 Yes No <br />East of Flower Street/Sakioka <br />Drive 60 75.04 75.14 0.10 Yes No <br />Flower <br />Street North of Sunflower Avenue 50 72.07 72.08 0.01 Yes No <br />(1) Exterior noise levels calculated 5 feet above pad elevation, perpendicular to subject roadway. <br />(2) Right-of-way per the City of Santa Ana General Plan Circulation Element, 1998. <br /> <br />Figure 17 shows the calculated exterior noise levels throughout the project at various reception <br />locations based on traffic on area roadways adjacent to the project. Table 22 lists the noise levels at <br />each of the reception locations shown in Figure 17. As shown, the exterior noise levels at the facades <br />of the apartment building that faces Sunflower Avenue with traffic volumes after project completion <br />would range between 29 dBA CNEL and 75 dBA CNEL. The exterior noise levels due to buildout traffic <br />volumes at the facades of the building that would face Flower Street would range between 66 dBA <br />CNEL and 71 dBA CNEL. The exterior noise levels at the pool/recreation area are calculated to be up <br />to 65 dBA CNEL. <br /> <br />Table 22 <br />Buildout Traffic Noise Levels and Recommended Window STC Ratings <br /> <br />Receptor Floor <br />Buildout <br />Traffic Noise <br />Levels <br />Required <br />Exterior to <br />Interior Noise <br />Reduction1 <br />Requir <br />ed <br />Windo <br />w STC1 Receptor Floor <br />Buildout <br />Traffic Noise <br />Levels <br />Required <br />Exterior to <br />Interior Noise <br />Reduction1 <br />Required <br />Window <br />STC1 <br />1 <br />1 63 18 21 <br />11 <br />1 29 n/a n/a <br />2 65 20 23 2 29 n/a n/a <br />3 66 21 24 3 31 n/a n/a <br />4 66 21 24 4 34 n/a n/a <br />5 66 21 24 5 39 n/a n/a <br />2 <br />1 59 14 17 <br />12 <br />1 60 15 18 <br />2 61 16 19 2 60 15 18 <br />3 62 17 20 3 61 16 19 <br />4 63 18 21 4 61 16 19 <br />5 63 18 21 5 61 16 19 <br />3 1 68 23 26 13 <br />1 73 n/a n/a <br />2 70 25 28 2 74 n/a n/a <br />6-102