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<br />12/17/2007 <br /> <br />Findings: Implementation of Mitigation Measure 13-1 would reduce this <br />potential impact to a less-than-significant level. <br /> <br />B. Ground-Borne Vibration Levels <br /> <br />Potential Impact 13-2: Project construction would involve pile driving of piles up <br />to 95 feet in length (and potentially longer, depending on project final design and engineering), <br />which could result in ground-borne vibration levels that damage nearby structures or interfere <br />with the enjoyment of daily activities. This effect would be considered a potentially significant <br />impact. <br /> <br />Mitigation 13-2: Reduce ground-borne vibration levels during project <br />construction by incorporating conditions in project construction agreements that stipulate the <br />following ground-borne vibration abatement measures: <br /> <br />1. Restrict vibration-generating construction activity to between the hours of <br />7:00 AM and 7:00 pm, Monday through Friday. Prohibit such construction <br />activity on weekends and holidays. <br /> <br />2. Notify occupants of land uses located within 200 feet of pile-driving activities <br />of the project construction schedule in writing. <br /> <br />3. Pre-drill pile holes to minimize the number of percussions required to seat the <br />pile. <br /> <br />Findings: Implementation of Mitigation Measure 13-2 is feasible and would <br />reduce this potential impact to a less-than-significant level. <br /> <br />C. Proiect Demolition and Construction Noise <br /> <br />Potential Impact 13-3: Project demolition and construction activities would <br />temporarily elevate noise levels at adjacent residential receptors (Villas at Bair Island, Marina <br />Pointe, Docktown) as well as at on-site residential areas constructed and inhabited during <br />earlier phases of the project construction period. Noise levels at 50 feet from the construction <br />equipment source could reach approximately 105 dBA, resulting in intermittent interference with <br />typical residential activities. These noise level increases could exceed the noise limits <br />established in the Redwood City StrateQic General Plan Noise Element. This possibility <br />represents a potentially significant short-term noise impact. <br /> <br />Mitigation 13-3: Reduce project demolition- and construction-period noise <br />impacts on nearby residences by incorporating conditions in project demolition and construction <br />agreements that stipulate the following conventional construction-period noise abatement <br />measures: <br /> <br />1. Construction Plan. Prepare a detailed construction plan identifying the <br />schedule for major noise-generating construction activities. The construction <br />plan shall identify a procedure for coordination with adjacent noise-sensitive <br />facilities so that construction activities and the event schedule can be <br />scheduled to minimize noise disturbance. <br /> <br />Atty/Reso/Reso.1772 <br />121707 <br /> <br />39 <br /> <br />14829 <br />Muff# 613 <br />