AgdaPkt 2010-01-25 clsd and regular

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6.2A Page 46 Construction could occur an extra day on weekends (six days per week) at tunnel shafts and along the pipeline alignment. If any Saturday construction were to occur in Newark, Menlo Park, and Redwood City, the Project could expose people to, and generate, noise levels in excess of local standards because construction noise is not generally allowed in these jurisdictions on Saturdays. . Mitigation Measure NOI-2: Noise controls for Ravenswood and Newark shaft sites Mitigation Measure NOI-2 would help reduce construction noise levels, but would not reduce noise levels to below ordinance daytime noise limits. In addition, because some shaft and roadway/railroad crossing work could require the SFPUC to perform construction on the weekends, and because noise generated during weekend work may not be fully mitigated, this would be a significant unavoidable impact. Impact NOI-2f. Construction related trucking operations within the City of Newark as part of pipeline and vault construction would exceed noise limits specified in the Newark General Plan's Noise Element. Constroction-related increases in truck traffic would result in noise increases along haul routes to and from the Ravenswood and Newark Valve Lots (see DEIR Section 4.16, Transportation and Traffic, Figures 4.16-2 and 4.16-3). Noise levels generated by estimated maximum hourly truck volumes by facility type (see DEIR Section 4.16, Transportation and Traffic) are shown in Table 4.12-17. Pipeline construction would generate an average of 104 truck trips and 100 worker-vehicle trips to and from the construction site per day, or approximately 14 trucks and 25 worker vehicles per hour during the peak hours. Project-related traffic noise increases could be noticeable along residential roads and adjacent to residential dwellings, and could exceed local noise ordinances. The City of Newark limits truck noise to 75 dBA at 50-feet. Since truck noise levels generated by Project-related traffic will exceed the 75 dBA criterion, and truck noise levels would be significant. Construction of the valve lots would generate up to an average of 10 truck trips and 20 worker vehicle trips to and from the construction site per day, or up to approximately 2 trucks and 10 worker vehicles per hour during the peak hours. For the same reason above, truck noise levels would be significant. This is a significant impact, for which no mitigation would be effective at reducing noise levels, and which will exceed the City's standard and is unavoidable. Impact NOI-2g. Construction-related trucking operations within the City of Newark as .. ... .... P.a..r..t..9.f..pip~lj~.~.~~.f.I..y.~1J.l.t~9.g~tr~~.i~J.l.WQ~J4.~~~~~f:l..~9~~.~.Ji.mi~~.s.p.~~i.fi.~.4j~. J~~N~~~:r.~ ...... ........ . Gell'eralPlan ' sN oise. Element. . .. . Because the tunnel boring machine (TBM) would be launched from the Ravenswood Valve Lot, tunnel construction activities at the Newark Valve Lot, where the TBM would exit, would be fewer and shorter in duration; however, during the first four months, shaft construction activities would generate an estimated average of 112 truck trips and 44 worker vehicle trips to and from the construction site per day, or up to a maximum of 14 truck trips and 22 worker vehicle trips during the Project's peak traffic generation hour (restricted to the daytime hours only). Trucks accessing the Newark Valve Lot would use one of four proposed routes: Route 1: Willow Street to Thornton Avenue to SR 84; Route 2: Willow Street to Thornton Avenue to 1-880; Route 36