RES 09265 - Laserfiche WebLink

4. Potential for substantial permanent increase in ambient noise levels Finding. The City finds that the following mitigation measure is feasible and has been incorporated into the MMRP, thereby mitigating the impact to a less-than-significant level: Provide noise attenuating pavement to new portions of Stoneridge Drive, per MM NO-4.1 DEIR, p. 3.7-35 Findings Demonstrating No Need for Recirculation 1. Effect of Concurrent Extension on Noise The impacts of constructing an additional two lanes of Stoneridge Drive and pile-driving associated with the construction of a second bridge across Arroyo Mocho will be the same as the impacts analyzed by the Draft EIR for the first two lanes and first bridge of Stoneridge Drive. The combined noise impacts of contemporaneous construction of both halves of Stoneridge Drive with the Concurrent Extension will not be greater than with the Deferred Extension because the noise created by the construction of each half of Stoneridge Drive will be reduced to a less than significant level by the noise attenuation measures of Mitigation Measure NO-3.1. Additional pile-driving noise impacts associated with the construction of a second bridge across Arroyo Mocho would also be mitigated to a less than significant level by Mitigation Measure NO-2.1 because it requires compliance with the same peak particle velocity standard regardless of whether one or two bridges are constructed at any given time. The same notification requirements of Mitigation measure NO-2.2 would also apply to reduce pile-driving impacts to a less than significant level. (See, Section 3.3 above for additional related mitigation). Ambient transportation noise levels may be higher with the Concurrent Extension due to additional through-traffic along Stoneridge Drive under project conditions. The Draft EIR analyzed the noise impacts of the full extension of Stoneridge Drive to EI Charro Road at the cumulative level and found them to contribute 1.5 dBA compared to the cumulative baseline. The Draft EIR determined that cumulative ambient transportation noise impacts would be less than significant by requiring noise attenuating pavement for the full extension of Stoneridge Drive as a mitigation measure, which would reduce noise levels by 2 to 3 dBA. As such, while the Concurrent Extension could introduce additional ambient transportation noise impacts at an earlier date than the Deferred Extension, the Draft EIR has already analyzed such impacts at the cumulative level and has deemed them to be less than significant after mitigation. Stoneridge Drive Specitic Plan Amendment and Staples Ranch Project Environmental Impact Report Findings and Statement of Overriding Considerations Page 29 of 47