Noise and Vibration Assessment

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Table 2Typical Noise Levels in the EnvironmentCommon Outdoor Activities Noise Level (dBA) Common Indoor Activities110 dBA Rock bandJet fly-over at 1,000 feetGas lawn mower at 3 feet100 dBA90 dBADiesel truck at 50 feet at 50 mphFood blender at 3 feetNoisy urban area, daytime80 dBA Garbage disposal at 3 feetGas lawn mower, 100 feet 70 dBA Vacuum cleaner at 10 feetCommercial areaNormal speech at 3 feetHeavy traffic at 300 feet60 dBALarge business officeQuiet urban daytime 50 dBA Dishwasher in next roomQuiet urban nighttime 40 dBA Theater, large conference roomQuiet suburban nighttime30 dBA LibraryQuiet rural nighttimeBedroom at night, concert hall20 dBABroadcast/recording studio10 dBA0 dBASource: Technical Noise Supplement (TeNS), Caltrans, November 2009.5
Table 3 Reaction of People and Damage to Buildings for Continuous Vibration Levels 1VibrationLevel,PPV (in/sec) Human Reaction Effect on Buildings0.006 to 0.019Threshold of perception,Possibility of intrusionVibration unlikely to cause damage of any type0.08 Vibrations readily perceptibleRecommended upper level of the vibration towhich ruins and ancient monuments should besubjected0.100.200.4 to 0.6Level at which continuousvibrations begin to annoy peopleVibrations annoying to people inbuildingsVibrations consideredunpleasant by people subjectedto continuous vibrationsVirtually no risk of “architectural” damage tonormal buildingsThreshold at which there is a risk of“architectural” damage to normal dwellingssuch as plastered walls or ceilings.Vibration at this level would cause“architectural” damage and possibly minorstructural damage.EXISTING NOISE ENVIRONMENTThe Dingee Backbone Pipeline Replacement project alignment traverses an area comprised primarilyof residential land uses. Local traffic is the primary ambient noise source affecting area residences.A noise monitoring survey was made to quantify ambient noise levels along the project alignment onFriday, July 9, 2010. Short-term noise measurements were made at five locations adjacent tosensitive uses bordering the proposed project alignment: at the intersection of Roble Court and RobleRoad (ST-1); near the dead end of Contra Costa Road (ST-2); at the intersection of BroadwayTerrace and Buena Vista Avenue (ST-3); at the intersection of Proctor Avenue and Agnes Street (ST-4); and at the intersection of Harbord Drive and Amy Drive (ST-5). At each receiver, measurementswere taken over a period of 15-minutes. Figure 1 shows the project alignment, vicinity, and noisemonitoring locations selected during the survey. Table 4 summarizes the noise data collected duringthe survey.ST-1, located on Roble Road at the Roble Court intersection, experienced sparse local traffic duringtesting, including a resident pulling out of a nearby driveway. One jet was noted overhead, and noise1 Transportation Related Earthborne Vibrations (Caltrans Experiences), Technical Advisory, Vibration TAV-02-01-R9601,California Department of Transportation, February 20, 2002.6
Page 1 and 2: DINGEE BACKBONE PIPELINE REPLACEMEN
Page 3 and 4: noise at any instant in time, commu
Page 5: Table 1Definitions of Acoustical Te
Page 9 and 10: at “slow” response. The sound l
Page 11 and 12: Mobile Equipment. Maximum sound lev
Page 13 and 14: used to provide the highest level o
Page 15 and 16: Table 7Typical Range of Noise Level
Page 17 and 18: Major Project Cases:a) Such activit
Page 19: construction activities would be of

Noise and Vibration Assessment

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