3_Exhibit C_ADDENDUM ONLY - Laserfiche WebLink

City of Pleasanton—Stoneridge Mall Residential Project CEQA Checklist Section 15183 Checklist/15164 Addendum 144 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 Stationary Source Noise Impacts The Prior EIR found that noise from stationary sources in the vicinity of potential sites for rezoning could result in increased noise levels in excess of the applicable 60 dB Lmax exterior noise exposure limit established within the City Municipal Code. Additionally, some areas are adjacent to industrial/commercial areas and could be subject to loading noise and late or 24-hour operations noise. However, the Prior EIR concluded that implementation of MM 4.J-6a through MM4.J-6c would reduce this noise impact to a less than significant level. Analysis of Proposed Project Construction Noise Impacts According to the Prior EIR noise analysis, reference noise exposure levels generated by the loudest types of heavy construction equipment and tools would result in noise levels ranging up to 85 dBA Lmax, and 82 dBA Leq(hourly), as measured at 50-feet from the source. The proposed building construction footprint where this loudest construction equipment would operate is located 70-feet from the nearest project property plane. At this distance, these reasonable worst-case construction noise levels would attenuate to below 82 dBA Lmax, and 79 dBA Leq(hourly). These noise levels are below the City’s noise performance threshold of 86 dBA Leq, as measured at the property plane. In addition, the project must comply with MM 4.J-1, which limits permissible hours of construction and includes additional best management noise reduction measures, and designation of a noise disturbance coordinator who will be responsible for responding to complaints about noise during construction. Therefore, with implementation of MM 4.J-1, project construction activities would not result in a substantial temporary increase in ambient noise levels in excess of the City’s applicable noise performance standards, and the impact would be less than significant. Traffic Noise Impacts A traffic noise impact analysis was prepared by Kimley-Horn, dated October 19, 2022. The report is included in Appendix G. This analysis implemented Prior EIR MM 4.J-5a and MM 4.J-9, which require each rezoning site identified in the Prior EIR to make a fair-share contribution toward attenuation of the increased noise created by traffic generated by development. Fair-share percentages were calculated to determine the proposed project’s contribution toward the mitigations for roadways with potentially significant traffic noise impacts within the City’s Housing Element Supplemental EIR. Roadways where the proposed project would add trips were analyzed for the fair-share contribution. Based on the analysis, the trips generated by the proposed project would constitute the following percentages of total traffic on the following eight roadway segments: 1. Foothill Road north of Canyon Way = 1.65 percent 2. Foothill Road south of Canyon Way = 0.81 percent 3. Canyon Way east of Foothill Road = 2.16 percent 4. Springdale Avenue north of Stoneridge Drive = 0.33 percent 5. Springdale Avenue east of Springdale Avenue = 0.15 percent 6. Stoneridge Mall Road north of Stoneridge Drive = 3.42 percent 7. Stoneridge Drive east of Stoneridge Mall Road = 1.69 percent