Reso 2004-069 - Laserfiche WebLink

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POTSV~IlAl.1.Y POTSy"r1ALLti SIGvFICA,v"r LESS TIL~y ISSGES SIGyIFICAyr L yLF-SS SIC;vIPfCAyT 1~7PACr SOLRCES 15SLES ~11TIGAlIOA' 1~1P9CT 1ACORPORATEp 9. NOISE. V1'ould the ro'ect result in: a. Exposure of persons to or generation of noise X I, `~~ ~> >> levcls in excess of standards established in the local general plan or noise ordinances, or a livable standards of other a envies? b. Exposure of persons to or generation of X 1, a, 7, 11 excessive groundboi~ne vibration of roundborne noise levels`? e. A substantial permanent increase in X 1, 4, 7, 11 ambient noise levels in the project vicinity above levels existin without the ro~ecC? d. A substantial temporary or periodic increase in X 1, 4, 7 ambient noise levels in the project vicinity above levels existin without the ro~ect? e. For a project located within an airport land use X ~ plan, would the project expose people residing or working in the project area to excessive noise levels'? f. For a project within the vicinity of a private ~ ~ airstrip, would the project expose people residing or working in the project area to excessive noise levels? EXPLANATION: a,c,d) Due to the increase in truck traffic on the road network surrounding the project site, noise on these roadways (Monarch Bay Drive, Fairway Drive, Marina Boulevard, Doolittle Drive, and Davis Street) would correspondingly increase. However, this effect would not be significant given the time restrictions of truck activity which are part of the proposed project. Ambient noise levels in the Roberts Landing area are generally affected most by railroad noise and aircraft overflights from the Oakland international Airport, and currently are about 60-65 dBA, Community Noise Equivalent Level (CNEL) {Oakland International Airport -Airport Development Program Supplemental EIR, 2003). Excavation activity at the DMMS would have little effect on most residents in the area due to the distance (greater than 300 feet) between the equipment use and the nearest residences (receptors). There would, hov,~ever, be an increase in roadside noise levels due to project-related truck traffic on haul roads that extend through residential areas. .About 21 trucks per hour would pass along these roads due to this project. On Marina Boulevard and Fairway Drive, truck frequency would only be about 1 1 trucks per hour due to these streets being designated one-way truck haul routes. Each truck that passes would temporarily increase noise levels to between 80-~5 dBA within 50 feet. To the average person, this increase would be perceived to be about twice as loud as "normal" (i.e. non-truck) traFFc. However, a substantial percentage of existing traffic on the proposed routes is comprised of trucks. Normally, the increase in noise due to the increase in truck traffic on roads through residential areas would be a significant effect. However, as part of the project, truck traffic would be from 8:00 a.m. l0 5:00 p.m. Monday through Friday. and would be temporary. Thus, given that the increase in noise would occur during the less-sensitive time period (daytime) and the hauling activity is expected to last only three months, the effect would not be significant. b) Construction activities and truck transportation would also generate vibration. FIuman response to vibration varies with the degree of vibration and the frequency or frequencies at which the vibrations occur. Generally, humans cannot perceive vibrations at levels less than 1 x 10-2 inches per second (O.OI inches per second). A truck or bulldozer at a distance of 50 Feet away will typically generate vibration slightly higher than this threshold and thus would be noticeable, but not unpleasant to humans and not potentially damaging to buildings. Vibration attenuates rapidly with distance from the source and at 200 feet would be imperceptible. Most of the homes and other buildings along the proposed haul routes are at least 150 feet distant from the center of the roadway. e,f) The project does not involve the development of anoise-sensitive land use, and thus, would not expose people to excessive aircraft noise. San Leandro Dredged Material Management Site 12 March / 2004 Sediment Removal Project