2024-053 - Final Supplemental for The Related Bristol Specific Plan Project

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would implement the GPU policies governing scenic quality. Table 5.8-4 of the Draft Supplemental EIR describes the proposed Project Is consistency with the relevant GPU goals and policies regarding aesthetics. As detailed, the proposed Project would be consistent with and implement the GPU policies through the design guidelines that are included in the proposed Specific Plan (Draft Supplemental EIR at pp. 5.8-43 through 5.8-48). H. Noise Impact Finding: The Project would not generate excessive groundborne vibration or groundborne noise levels (Draft Supplemental EIR at p. 5.9-30). Facts in Support of Findings: Construction Demolition, excavation, and grading activities are required for the Project and can result in varying degrees of groundborne vibration, depending on the equipment and methods used, distance to the affected structures and soil type. As indicated in Table 5.9-18 of the Draft Supplemental EIR, based on FTA data, vibration velocities from typical heavy construction equipment operations that would be used during Project construction range from 0.003 to 0.089 in/'sec PPV at 25 feet from the source of activity; and would range from 0.001 1 to 0.0315 in/'sec PPV at 50 feet from the source of activity. All of the onsite and offsite receptors are farther than 25 feet from construction areas; and therefore, actual vibrations at sensitive receptors would be less. These vibration levels would not be sustained during the entire construction period but would occur only during the times that heavy construction equipment is operating in the vicinity of the sensitive receivers. This level of vibration would be below the Caltrans building damage threshold of 0.2 in/sec PPV and vibration standard of 0.04 in/sec PPV for human annoyance at all receiver locations. Therefore, vibration impacts would be less than significant (Draft Supplemental EIR at pp. 5.9-30 through 5.9-31). Operation Operation of the proposed commercial and multi -family uses would include heavy trucks for residents moving in and out of the rental units, product deliveries to retail and restaurant uses, and garbage trucks for solid waste disposal. Truck vibration levels are dependent on vehicle characteristics, load, speed, and pavement conditions. However, typical vibration levels for the heavy truck activity at normal traffic speeds would be approximately 0.006 in,/sec PPV, based on the FTA Transit Noise Impact and Vibration Assessment. Truck movements on site would be travelling at very low speed, so it is expected that truck vibration at nearby sensitive receivers would be less than the vibration threshold of 0.08 in/sec PPV for fragile historic buildings and 0.04 in,/sec PPV for human annoyance, and therefore, would be less than significant. The operational vibration impacts that would be generated by the proposed Project would be less than those identified by the GPU FEIR, which were determined to be significant and unavoidable. Therefore, operational vibration impacts related to the proposed Project would not exceed those previously identified (Draft Supplemental EIR at p. 5.9-31 ). Impact Finding: The Project would not expose people residing or working in the Project area to excessive airport noise related to a public airport (Draft Supplemental EIR at p. 5.9-31 ).