Draft Environmental Impact Report - East Bay Municipal Utility District

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Estates Reservoir Replacement Draft Environmental Impact ReportNoise and Vibrationacceptable (U.S. EPA, 1974). The exterior shell of a house can reduce exterior noiselevels by 25 dBA with the windows closed and 15 dBA with the windows open. Dueto the long-term nature of project construction, it is expected that affected residentswould have their windows open at times during warm weather periods for ventilation.Therefore, exterior noise levels of 50 dBA (windows open) or 60 dBA (windowsclosed) would maintain an acceptable interior noise environment of 35 dBA. Localordinance limits of 53 dBA (Leq) would allow windows to be open partially during thenight.The Oakland Noise Ordinance lists noise controls for various construction activities, andnotes that the inclusion of these controls is assumed to reduce noise impacts from projectconstruction to less than significant levels. In general, the mitigation measures utilized forthis Project will utilize the majority if not all of the City of Oakland’s Noise ControlMeasures.Impacts and Mitigation MeasuresConstruction Impacts - This section evaluates noise levels that would be expected fromthe demolition of Estates Reservoir; the installation of two new replacement tanks; andthe rehabilitation work inside the Montclair Pumping Plant. As previously stated,construction will be limited to daytime hours, between 7:00 a.m. to 7:00 p.m. consistentwith the City of Oakland’s Noise Ordinance. After hours or weekend construction is notanticipated except for unplanned/unexpected occurrences or critical shutdowns approvedby EBMUD.Impact 3.9-1: Construction of the Estates Reservoir Replacement Project couldgenerate intermittent and temporary noise above existing ambient levels.Construction activities associated with demolition and construction of the EstatesReservoir Replacement Project would result in temporary noise increases to residentsalong Estates Drive, adjacent to the reservoir site and within the surrounding community.Construction noise levels would fluctuate at any given receptor depending on the type ofwork, construction phasing, equipment type/duration of use, distance between the noisesource and receptor, and the presence or absence of barriers between the noise source andreceptor. Residences around the Estates site are located as close as 100 feet fromproposed reservoir demolition and tank construction area. Construction-related noiseincreases would occur intermittently and periodically over a two year period.Demolition activities at Estates Reservoir site would require a series of steps utilizing thefollowing equipment:Drain reservoir – 5-horsepower portable pump and tank truck.Remove gravel roofing – laborers with hand tools and haul truck.Remove paneling – laborers with hand tools and haul truck.Remove joists – laborers with hand tools, chain saws, and crane.sb09_001.doc 3-9.12 7/22/2009
Estates Reservoir Replacement Draft Environmental Impact ReportNoise and VibrationRemove girders – laborers with hand tools, chain saws, and crane.Remove columns – laborers with hand tools, chain saws, and crane and hoe ram.Remove lining – laborers with hand tools, and crane, hoe ram, haul trucks, aircompressors, concrete recycler (the heavy equipment could also be used in theearlier steps).Installation of the new tanks at Estates Reservoir would require the following tasks andequipment:Tank foundation and floor slabs – crane, drill rig, front and leader, concretepumper and concrete trucks.Tank walls – crane, concrete trucks, concrete pump, and pre-stressingmachine.Tank roofing – crane, concrete trucks, concrete pump, pre-stressing machine.Valve pit piping – crane, concrete trucks, concrete pump, pre-stressingmachine.Backfilling – bulldozer, compactor, scraper.Site restoration – haul truck, backhoe.Complete civil work – haul truck, backhoe.Demobilization – haul truck, backhoe.Typical construction equipment noise emission levels at 50 feet, assuming standardcontrols such as proper mufflers, are shown in Table 3.9-5. Based on EBMUD staffexperience with other projects, and utilizing the data in Table 3.9-5, worst case dailyaverage noise levels can be estimated for each phase during demolition and construction.The corresponding noise level projections are summarized in Table 3.9-6. Theprojections are made by logarithmically summing the noise contributions from operatingequipment during each activity at 50 feet and then determining the distance sufficient toreduce the level to 65-dBA.Residences are located at varying distances from the active construction areas, fromabout 100 feet to several hundred feet from the perimeter of the reservoir constructionarea, to within 50 feet of the Montclair Pumping Plant. In general, noise levels drop offat the rate of about 6-dBA with each doubling of distance from the activity center dueto attenuation between a site and receptors. Buildings located between a noise sourceand receptors can also act as noise barriers wherever they interrupt direct lines-of-sight,helping to reduce noise levels at receptors. Residences located directly across from orimmediately adjacent to the Estates Reservoir (along Estates Drive) will experience themost noise increase from construction, since there is no structural barrier between thesehomes and the reservoir site. Residences located beyond Estates Drive or withininterior neighborhoods will have structural buffers and will thus experience less noisefrom construction activities.sb09_001.doc 3-9.13 7/22/2009
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Estates Reservoir ReplacementDraft
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TABLE OF CONTENTSEstates Reservoir
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Estates Reservoir Replacement Draft
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ACRONYMS AND ABBREVIATIONSABABAGAPC
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SUMMARYS.1 IntroductionThis Draft E
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Estates Reservoir Improvements Draf
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Chapter 2Project Description2.1 Ove
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Chapter 3Environmental Setting, Imp
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3.5 Cultural Resources3.5.1 Approac
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Page 234: APPENDIX BNotice of PreparationAUGU
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Dingee Pressure Zone Improvement Pr
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FIGURESDingee Pressure Zone Improve
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Draft Environmental Impact Report - East Bay Municipal Utility District

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