14 ATTACHMENT 6 - Appendix A - E

City of Pleasanton–Spotorno Ranch Reduced Development Project Initial Study/Consistency Checklist Environmental Checklist FirstCarbon Solutions 135 https://adecinnovations.sharepoint.com/sites/PublicationsSite/Shared Documents/Publications/Client (PN-JN)/2148/21480021/Consistency Checklist/21480021 Spotorno Ranch Consistency Checklist ScreenCheck.docx proposed. The intersection turning volumes were converted to average daily trips utilizing each study scenario of the traffic study, both without and with the project. Average daily trips for the 22 single-family houses with ADU’s were estimated by Fehr and Peers as described in Section 4.17, Transportation, below. The number of daily trips generated by the proposed project would be about 10 more per day compared to the previously analyzed project, but peak-hour trips would be fewer. This marginal number of daily trips is not expected to change the overall noise level previously calculated. The resultant noise levels were weighed and summed over a 24-hour period to determine the Ldn values. The traffic noise modeling input and output files—including the 60 dBA, 65 dBA, and 70 dBA Ldn noise contour distances—are included in Appendix G. Table 3 shows a summary of the traffic noise levels for existing, near-term, and cumulative conditions, with and without the project as measured at 50 feet from the centerline of the outermost travel lane. Table 3: Existing, Near Term, and Cumulative Modeled Roadway Noise Levels Roadway Segment Ldn (dBA) 50 feet from Centerline of Outermost Lane Existing Plus Project Increase over Existing No Project (dBA) Near Term Near Term Plus Project Increase over Near Term No Project (dBA) Cumulative Cumulative Plus Project Increase over Cumulative no Project (dBA) Sunol Boulevard— I-680 off-ramp to Riddell Street 66.3 0.1 67.6 67.6 0.0 68.2 68.3 0.1 Sunol Boulevard— Riddell Street to Arlington Drive 66.3 0.0 67.6 67.6 0.0 68.3 68.3 0.0 Sunol Boulevard— Arlington Drive to Sycamore Road 66.2 0.0 67.2 67.2 0.0 68.0 68.0 0.0 Sycamore Road— Sunol Boulevard to Sycamore Creek Way 54.8 0.5 55.6 56.0 0.4 56.1 56.4 0.3 Sycamore Road— Sycamore Creek Way to Amber Lane 51.5 0.8 51.8 52.4 0.6 53.1 53.5 0.4 Happy Valley Road— West of Alisal Street 48.0 1.6 49.4 50.0 0.6 50.3 51.1 0.8 Alisal Street—Happy Valley Road to Faith Chapel Assembly of God 43.1 1.2 45.0 45.1 0.1 45.9 46.3 0.4 Notes: dBA = A-weighted decibel Ldn = day/night average sound level Source: FCS 2018.