3_Exhibit C_ADDENDUM ONLY - Laserfiche WebLink

City of Pleasanton—Stoneridge Mall Residential Project Section 15183 Checklist/15164 Addendum CEQA Checklist FirstCarbon Solutions 145 Https://adecinnovations.sharepoint.com/sites/PublicationsSite/Shared Documents/Publications/Client (PN-JN)/2148/21480017/Consistency Checklist/21480017 Stoneridge Mall Residential Project Checklist Addendum_Updated.docx 8. Stoneridge Drive west of Stoneridge Mall Road = 0.15 percent The City ’s noise attenuation treatment for affected roadway segments is to install noise-attenuating pavement (rather than typical pavement). According to the traffic consultant for the proposed project, Kimley-Horn, the noise-attenuating pavement commonly used in the City is rubberized Hot- Mix Asphalt (R HMA), while typical pavement consists of Hot-Mix Asphalt (HMA). Assuming a 2-inch overlay, R HMA will cost approximately $0.63 per square feet more than HMA. Therefore, to reduce the substantial traffic noise increase impact, in accordance with Prior EIR MM 4.J-5a and MM 4.J-9, Implementation Measure 1 shall be imposed as a Condition of Approval to require the proposed project to pay an amount equal to the project’s percentage of traffic on each affected road segment, multiplied by the incremental cost of using noise-attenuating pavement instead of regular pavement on that segment, to be paid prior to the first certificate of occupancy. If the cost amounts are not available at the time of project approval, the Director of Community Development, or other City-designated official, shall identify that incremental cost prior to issuance of building permits. Therefore, in accordance with MM 4.J-5a and MM 4.J-9 of the Prior EIR, Implementation Measure 1 would ensure that project-related traffic noise increases would remain less than significant. Stationary Source Noise Impacts A noise impact analysis was also prepared by Ramboll, dated October 27, 2022. The report is included in Appendix G. The study assessed the proposed project’s compliance with the Prior EIR MM 4.J-6a (Assessment of Noise from Stationary [Non-transportation] Sources in the Vicinity of the Project). The report shows that noise from non-transportation sources such as rooftop mechanical units and truck activity at a nearby loading dock were evaluated using noise modeling software. Based on the modeling results, project stationary noise sources would not result in a substantial increase in ambient noise levels that would exceed the City’s 60 dBA Ldn threshold, as measured at the property planes of the project site, and the impact would be less than significant. Therefore, there are no environmental effects that are peculiar to the proposed project or the parcels on which the proposed project would be located. Impacts would be less than significant and the proposed project would not result in a new or more severe adverse impact that was not previously identified in the Prior EIR. b) Excessive Groundborne Vibration Prior EIR Conclusions The vibration impact analysis relevant to this checklist question was addressed in the Prior EIR, in Impact 4.J-2 and Impact 4.J-4. The following provides a summary of the findings of the relevant discussions. The Prior EIR found that vibration exposure at neighboring sensitive uses, which are expected to be greater than 100 feet removed from the construction sites, would not be expected to exceed the