RDA Reso 2000-004 - Laserfiche WebLink

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• • If nighttime deliveries are implemented, the sound wall would need to provide an 8 dBA reduction to avoid a 3 dBA increase in the Ldn at adjacent residences to the north. This could be achieved with a sound walUvegetative berm combination of 12 feet (i.e., 4 foot berm, eight foot wall). Again, the wall should extend as far as possible from the loading area to the west to avoid loss of attenuation at westernmost residences. Because of the presence of the existing significant creekside vegetation, the identified soundwall mitigation would not be readily visible to residents to the north and would. not result in a secondary visual impact. Level of Significance After Mitigation: Less than Significant Impact 3: Project-generated traffic noise would result in aless-than-significant noise impact to nearby sensitive noise receptors. Using the FHWA traffic-noise prediction model, roadside traffic noise levels were predicted for existing conditions, existing plus project conditions, and existing plus project and future growth conditions: The results of this modeling effort are shown in Table 2. For the modeling effort, afternoon peak-hour traffic volumes during the weekdays were used and noise levels at about 50 feet from the centerline of the roadway were calculated. As seen from Table 3, the addition of project-related traffic alone would not noticeably increase ambient noise levels (i.e., the project would not increase ambient noise levels 6y 3 dBA, Leq or more). The estimates provided in Table 3 also indicate that the cumulative increase in traffic noise (i.e., project plus future growth) would not be noticeably higher than existing levels. Thus, the project-specific and cumulative impact on traffic noise levels would be less-than-significant. Mitigation Measure 3: None required. Impact 4: The project would develop commercial land uses in an area where noise levels would be "conditionally acceptable" for such uses. Based on the noise measurement data collected for this analysis, ambient noise levels at the proposed creekside Center aze in the range of 60 to 70 Ldn which is considered "conditionally acceptable" under the General Plan for commercial land uses. The General Plan defines "conditionally acceptable" to mean that "new development should be undertaken only after a detailed analysis of the noise reduction requirements is made and needed noi~P insulation features included in the design. Conventional construction, but with closed windows and fresh air supply systems or air conditioning will normally suffice." The commercial uses proposed aze those which would be supplied with air conditioning and ~,~~ 9