Res10 P-2095 - Laserfiche WebLink

Browse Search

the lower would be the perceived noise. Geometric spreading causes the sound level to attenuate or to be reduced. There is a 6-dB reduction in the noise level for each doubling of distance from a single noise point source.The temporary, short-term construction noise level associated with project would therefore be acceptable,based on the City of Redwood City's Noise Ordinance. Table 2 Noise Emission Levels of Construction Equipment Typical Noise Level(oSA) Equipment 50 Feet from Source Cranes(Movable) 74-90 Diesel-powered barges 85 Dump Trucks 81-87 Small clamshell dredge 80 Sheet pile driver 81-96 Compressors 66-80 Vibrators 68-78 r !r+ Small boat 55 Sources:Handbook of Noise Control,Cyril M.Harris,1979;Bolt,Beranek&Newman,Noise Control for Buildings and Manufacturing Plants,1987;and California Coastal Conservancy,Napa River Salt Marsh Restoration Project,Draft EIRIEIS,April 2003. Properly operating and maintained noise mufflers are required by the City of Redwood City for all construction equipment,whether fixed or mobile,and construction vehicles. All operations must minimize the temporary and short-term construction noise effects on adjacent sensitive uses, such as the nearny offices,residents who live aboard boats in the harbor and in the mobile home park approximately 2 miles from the site,as well as the various recreational uses along the waterfront. b) The nearest sensitive receptors to the construction activities are office workers,residents who live aboard boats in the harbor and in the mobile home park approximately 2 miles from the site,and various recreational users along the waterfront would not be expected to be impacted by the submerged,open-water vibratory effects from pile removal. The pile removal activities would not be subject to ground-borne vibrations. c) The Multi-Agency Maritime Facility renovation and upgrade proposes no changes in land use,or any new landside structures or stationary sources that would contribute to noise in the project area.There would be no significant permanent impacts on the ambient noise levels in the area. d) The Multi-Agency Maritime Facility renovation and upgrade proposes no changes in land use,or no new landside structures or stationary sources that would contribute to extended periods of temporary or periodic noise in the project area,unrelated to the noise identified in the preceding section(a). The existing background noise and noise sources would continue with or without the Facility upgrade project.There would be no significant permanent impacts on the ambient noise levels in the project area. e) The project site is located just over two miles from the San Carlos Airport(the closest airport to the site). The project site is not located within an airport land use plan area or within two miles of a public or public use airport. The project does not involve the development of a noise-sensitive land use,therefore,the activity would not expose people residing or working in the project area to excessive noise levels. f) The project site is not located near a public or public use airport,or private airstrip. The project does not involve the development of a noise-sensitive land use,therefore,it would not expose people residing or working in the project area to excessive noise levels. Port of Redwood City Multi-Agency Maritime Facility 36 February 2010 Initial Study