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Commuter Car Park and Interchange Program 18 Report Number 610.08297Mount Druitt Commuter Car Park29-Nov-2010Noise and Vibration Impact Assessment Revision 1Table 11 Typical Vehicle Noise EventsSourceTypical LA1(60sec) Sound PowerLevel (dBA)Car Moving 83 to 90 37Car Door Closing 88 to 93 42Car Starting 91 to 97 45Car Accelerating 93 to 98 47Typical LA1(60sec) Sound PressureLevel at 80 m(dBA)These predicted LA1(60second) noise levels are below the sleep disturbance screening criterion of55 dBA at the nearest residential receiver location at Beames Ave which is located approximately80 m from the proposed commuter car park site.5.5 Operational Noise DiscussionThe ambient noise environment at the nearest residential receivers is dominated by existing roadtraffic and rail noise. The proposed development would not introduce any new noise sources to thearea as it would be built on a site near existing car parks. The distance to the nearest sensitivereceivers would also not be significantly reduced. Consequently, the maximum noise levels fromshort-term events, such as door slams, engine start-ups and cars accelerating are not predicted toincrease as a result of the upgraded car park.The commercial building on the northern boundary of the site is not predicted to experience asignificant noise impact due to the operational noise from the car park. The noise environment at thenearby TAFE would continue to be dominated by the road noise from existing local streets.In terms of additional traffic on nearby streets, only a very minor increase in traffic flow would beexpected due to the proposed car park. It would also mostly be limited to peak commuter times. Onthis basis, the noise level contribution from activities within the upgraded car park and any additionalroad traffic to and from the car park would be considered insignificant when compared to existinglevels of road traffic noise.5.6 Operational Vibration5.6.1 Operational Vibration Trigger LevelsThe DECCW’s “Assessing Vibration: a technical guideline” is based on British Standard BS 6472-1992and provides vibration trigger levels to minimise the disturbance to building occupants fromcontinuous, impulsive and transient vibration. For road vehicle passbys, the DECCW guidelineclassifies vibration levels as being intermittent.For intermittent vibration at residential receiver locations, vibration trigger levels are expressed interms of the Vibration Dose Value (VDV) during the daytime (7.00 am to 10.00 pm) and night-time(10.00 pm to 7.00 am) periods. The VDV is a measure that takes into account the overall magnitudeof the vibration levels during a vehicle movement, as well as the total number of vehicle movementsduring the daytime and night-time periods.The proposed vibration trigger levels are summarised in Table 12.Heggies Pty LtdA member of SLR Group
Commuter Car Park and Interchange Program 19 Report Number 610.08297Mount Druitt Commuter Car Park29-Nov-2010Noise and Vibration Impact Assessment Revision 1Table 12 Trigger Levels for Intermittent VibrationLocationVDV (m/s 1.75 ) 1Day(7am - 10 pm)Residential Properties 0.2 0.13Offices, Schools, Educational Institutions and Places of Worship 0.4 0.4Note 1:Night(10 pm - 7 am)Vibration Dose Values (VDVs) are based on the “preferred” values in the DEC guideline Assessing vibration: atechnical guideline (2006)The levels of vibration required to cause damage to buildings tend to be at least an order of magnitude(10 times) higher than those at which people consider the vibration acceptable. Hence, the controllingdesign goals will still be the human comfort design goals, and it is therefore not necessary to setseparate design goals for this proposal in relation to building damage or damage to building contentsfrom operational vibration.5.6.2 Operational Vibration AssessmentSection B2.3 of the DECC vibration guideline provides a calculation procedure for determining theVibration Dose Values (VDV) on the basis of the measured (or predicted) rms vibration velocity levels.For the daytime and night-time periods, the eVDV(overall) is based on the following formula:eVDV(overall) = 0.07 x V rms x (t x N) 0.25 (m/s 1.75 )Where: t represents the time period for a representative vehicle movement.Vrms is the vibration level for a representative vehicle movement.N represents the number of vehicle movements within the assessment period(daytime or night-time).On the basis of the assumption that the car park would be fully utilised during the daytime andnight-time periods (i.e. 220 movements for both the daytime and night-time) and with an assumedvehicle speed of 20 km/h, the allowable RMS vibration velocity level would be 1.3 mm/s in order tocomply with the VDV trigger level of 0.4 m/s 1.75 for commercial receivers.On the basis of SLR Heggies’ experience with vehicle induced vibration it is considered unlikely thatvehicle movements within the car park would result in vibration velocity levels of even one third thatrequired to exceed the trigger levels for the nearby commercial receivers (including the court house).However it should be noted that discontinuities in the surface such as speed bumps and drainagegrids could result in increased levels of vibration at nearby sensitive receivers. This is particularly truefor multi level car parks that incorporate suspended floor slabs that can be excited by an impulsiveforce such as a vehicle traversing a speed bump. A key consideration would be to ensure that theproposed car park is not coupled to adjacent sensitive receivers such as by removing connectionsbetween adjacent facades or utilising a common floor slab (as well locating and sizing thesediscontinuities appropriately).Heggies Pty LtdA member of SLR Group
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MOUNT DRUITT COMMUTER CARPARKREVIEW
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Commuter Car Park and Interchange P
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Mount Druitt Commuter Car ParkTraff
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Transit services provided at Mount
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Attachment 1: Origin Destination Su
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MOVEMENT SUMMARYMt DruittSouthern C
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MOVEMENT SUMMARYMt DruittNorth Para
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MOVEMENT SUMMARYMt DruittNorth Para
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MOVEMENT SUMMARYMt DruittJirrang Cl
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MOVEMENT SUMMARYMt DruittMount St /
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MOVEMENT SUMMARYMt DruittMount St /
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MOVEMENT SUMMARYMt DruittSherbrooke
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MOVEMENT SUMMARYMt DruittSherbrooke
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KMH-2010123a REF Rev 4 docStatus: F
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Commuter Car Park Mt DruittVisual I
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Page 196 and 197: Commuter Car Park Mt DruittVisual I
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