3_Exhibit C_ADDENDUM ONLY - Laserfiche WebLink

City of Pleasanton—Stoneridge Mall Residential Project CEQA Checklist Section 15183 Checklist/15164 Addendum 148 FirstCarbon Solutions 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 implementation of MM 4.J-6a through MM 4.J-6c would reduce this noise impact to a less than significant level. Analysis of Proposed Project Train Noise Impacts The project site is not located on any of the identified impacted sites identified in the Prior EIR (Sites 8, 11, 14, 18, and 21) which are near railroad tracks. Therefore, the proposed project would not be exposed to train noise levels that would exceed the applicable 70 dB Ldn exterior noise exposure limit and 50 dB Lmax/55 dB Lmax criteria within habitable rooms. Therefore, implementation of the proposed project would not result in a substantial permanent increase in or exposure of persons to train noise levels in excess of established standards and train noise impacts for the proposed project would be less than significant. Traffic 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-5c (Assessment of Traffic Sound Levels in Outdoor Activity Areas Associated with the Project). The analysis predicted traffic sound levels at the outdoor courtyards and rooftop decks using noise modeling software and road data from the Prior EIR and California Department of Transportation (Caltrans). The analysis found that the limit of 65 dBA Ldn is exceeded for the rooftop deck at the northeast corner of the building. Based on the results of the modeling, a properly constructed barrier along the north and east sides of the roof deck would reduce traffic sounds levels to 65 dBA Ldn or less at the rooftop deck. The barriers should run the length of the east and north edges of the rooftop deck, be at least 6 feet high, have a minimum surface weight of 3 pounds per square foot (psf), and have no cracks or gaps. Glass or another transparent material can be used. With the barrier in place, the results of the model show a sound level 65 dBA Ldn at the northeast rooftop deck Level 4. Therefore, in accordance with Prior EIR MM 4.J-5cImplementation Measure 2, shall be imposed as a Condition of Approval to require construction of this barrier as part of the project would ensure that traffic noise exceedance impacts remain less than significant as measured at the outdoor courtyards and rooftop decks. 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, sound levels at the property planes and the façades of the proposed project would not exceed the City’s 60 dBA Ldn threshold. Therefore, implementation of the proposed project would not result in a substantial permanent increase in stationary source noise levels in excess of established standards as measured at the property planes of the proposed project, and the impact would be less than significant.