Padma Multipurpose Bridge Project

Estimation of Noise Levels from Pile Driving21. Sound levels from various pile driving activities were compiled by the California Department ofTransportation (2007) 3 . Sound levels from 2.4 m (96 inches) steel pile driven through hydraulichammer measured at various distances is shown in Figure 7-5. The relationship between themeasured sound levels from the pile and distance from the pile is also shown in Figure 2.Figure 7-5: Relationship between Measured Sound Level and Distance from Pile22. From Figure 7-5, it can be seen that the noise levels reduce with the distance due totransmission losses. Noise levels from piling operations primarily depend on the type of the pile andtype of the hammer. Noise levels generated by the both vibratory and impact drivers are given inTable 7-6 to compare the noise levels from both the hammers and it can be seen that vibratoryhammers produce less noise levels than the impact drivers.Table 7-6: Comparison of Noise Levels from Pile Driving Steel Pipes through Different MethodsDriver Location Diameter WaterDepthDistancefromPeak RMS SMLVibratoryHydraulicImpactRichmond InnerHarbor,Richmond, CACity of Benicia,CA1.8 m (72inches)2.4 m(96 inches)source~ 5m 10 m20m30 m~ 10 to15m5m10m20m50m100m500m1,000mDiesel Impact San Rafel, CA 30 inches ~ 4 to 5m 10m20m30m40m60mDiesel ImpactSan Rafeal, CA 10 inches ~ 5m10 m20 m183176172227220214210204188180205200199194195190170170164160215205203196192174165190185181178169175160170164160201194190184180164155170Vibratory~ 5mSource: California Department of Transportation, 2007 410 m20 m1611521471373The California Department of Transportation (2007) Compendium of Pile Driving Sound Data -http://www.dot.ca.gov/hq/env/bio/files/pile_driving_snd_comp9_27_07.pdf4The California Department of Transportation (2007) Compendium of Pile Driving Sound Data -http://www.dot.ca.gov/hq/env/bio/files/pile_driving_snd_comp9_27_07.pdf7-10