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Response to Letter L5: Huy Nguyen, dated August 10, 2024 <br />Comment L5.1: This comment expresses concern about the vibration impacts from heavy machinery <br />operating within the Project site and being transported along adjacent roads (specifically MacArthur <br />Boulevard) during construction activity. <br />Response to Comment L5.1: This comment does not provide substantial evidence of a significant <br />environmental impact. The Draft SEIR adequately describes potential vibration impacts associated with the <br />use of heavy machinery and trucks on page 5.9-31 of the Draft SEIR. As discussed, truck vibration levels <br />are dependent on vehicle characteristics, load, speed, and pavement conditions. However, typical vibration <br />levels for heavy truck activity at normal traffic speeds would be approximately 0.006 in/sec PPV, based <br />on the FTA Transit Noise Impact and Vibration Assessment. Truck movements on site would be travelling at <br />very low speed, so it is expected that truck vibration at nearby sensitive receivers would be less than the <br />vibration threshold of 0.08 in/sec PPV for fragile historic buildings and 0.04 in/sec PPV for human <br />annoyance, and therefore, would be less than significant. <br />Comment L5.2: This comment suggests that construction traffic would result in delays and increased traffic <br />along adjacent roads. The commenter suggests an alternative construction route to avoid impacting <br />residents along MacArthur Boulevard to reduce traffic congestion. <br />Response to Comment L5.2: This comment does not provide substantial evidence of a significant <br />environmental impact. The Draft SEIR Section 5.1 3, Transportation, details that Senate Bill (SB) 743 changes <br />include the elimination of auto delay, LOS, and similar measures of vehicular capacity or traffic congestion <br />as the basis for determining significant impacts. As part of the 2019 amendments to the State CEQA <br />Guidelines, SB 743 directed that the revised CEQA Guidelines "shall promote the reduction of greenhouse <br />gas emissions, the development of multimodal transportation networks, and a diversity of land uses" (Public <br />Resources Code Section 21099[b][1 ]); and that "automobile delay, as described solely by level of service <br />or similar measures of vehicular capacity or traffic congestion, shall not be considered a significant impact <br />on the environment" (Public Resources Code Section 21099[b][2]). As such, pursuant to Public Resources <br />Code Section 21099(b)(2), the Supplemental EIR is not required to analyze impacts related to traffic <br />congestion during construction. <br />As discussed in Section 5.1, Air Quality, proposed Specific Plan Mitigation Measure AQ-1: Construction <br />Exhaust and Dust Control requires the preparation of a construction traffic control plan detailing the <br />locations of equipment staging areas, material stockpiles, proposed road closures, and hours of <br />construction operations, and designing the plan to minimize impacts to roads frequented by passenger cars, <br />pedestrians, bicyclist, and other non -truck traffic. As such, the Project would be required to follow a <br />designated construction route to avoid residential areas in the vicinity of the Project. <br />7 <br />