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7C <br /> Page 60 <br /> Findings: Implementation of Mitigation Measure 13-1 would reduce this <br /> potential impac#to a less-than-signifrcanf level. <br /> B. Ground-Borne Vibration Levels <br /> Potential Impact 13-2: Projec# canstruction would invo{ve 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 pofentially sign�cant <br /> impacf. <br /> Mitigation 'i3-2: Reduce ground-borne vibratian fevels during project <br /> construction by incorporating canditions in project construction agreements that stipulate the <br /> following ground-borne vibratian abatement measures: <br /> 1. Restrict vibration-generating canstrucfEon activity fio befiwesn t�i� hours of <br /> 7:0�AM and 7:00 pm, Monday through Friday. Prahibit such constructian <br /> activi#y on weekends and holidays. <br /> 2. Notify occupants of land uses locaied within 200 feet of pile-driving activities <br /> of the project construcfion schedule in writing. <br /> 3. Pre-drill pile holes to minimize the number af percussions required to seat the <br /> pile. <br /> Findings: Implementation of Mitigatian Measure 13-2 is feasib{e and would <br /> reduce this potential impact to a less-than-signifrcanE level. <br /> C. Proiect Demolition and Constructian Noise <br /> Potentiat Irnpact 13-3: Project demolition and construction activities would <br /> temporarily elevate noise levels at adjacent residential receptors (Villas at Bair lsland, Marina <br /> Pointe, Docktown) as weil as at on-site residential a�eas 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. T�ese naise {evel increases could exceed the naise fimits <br /> established in the Redwood Citv Strateqic General Plan Noise Element. This possibiiity <br /> represents a potenfially significant short-ferm noise impact. <br /> Mitigation 13-3: Reduce project demolition- and canstruction-period noise <br /> impacts on nearby residences by incorparating conditions in project demolition and construction <br /> agreements that stipulate the fol(owing conventional construction-period noise abatement <br /> measures: <br /> 1. Construction Plan. Prepare a detailed consfruction plan identifying the <br /> schedule for major noise-generating construction activities. The construction <br /> plan shall identify a pracedure for coordination with adjacsnt noise-sensitive <br /> facilities so that construction activities and #he event schedule can be <br /> schedufed to minimize noise disturbance. <br /> AttylReso/Reso.1772 39 <br /> 121307 <br />