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Commuter Car Park and Interchange Program 16 Report Number 610.08297Mount Druitt Commuter Car Park29-Nov-2010Noise and Vibration Impact Assessment Revision 1The estimated background noise levels are summarised in Table 8. In addition, operator-attendedmeasurements were conducted during the daytime period on 5 October 2010, between 3.15 pm and4.30 pm at monitoring locations as shown in Figure 1 and summarised in Table 1.Table 8Estimated Average Background LA90 Noise Levels from AS1055.2-1997.NoiseAreaCategoryR3Description ofneighbourhoodAreas withmedium densitytransportation orsome commerceor industryAverage background A-weighted sound pressure level, LA90 (dBA)Monday to SaturdaySundays and Public Holidays0700-1800 1800-2200 2200-0700 0900-1800 1800-2200 2200-090050 45 40 50 45 40From the information contained in Table 1 and Table 8 it is seen that the average daytime backgroundLA90 background noise levels estimated from AS 1259.2-1990 are comparable to those measuredduring the daytime operator-attended ambient monitoring and as such verify the estimatedbackground noise levels used for the operational noise assessment.5.3 Car Park Noise GoalsA summary of the project specific noise limits and sleep disturbance screening criterion for the carpark is presented in Table 9.Table 9Operational Noise GoalsType ofReceiverTime of Noise Level dBADay 1 ANL 2 RBL(period) LA90(15minute) 3INP CriteriaIntrusiveLAeq(15minute)Criterion forNew SourcesAmenityLAeq(Period)Criterion forNewSources 4SleepDisturbanceScreeningCriterionLA1(60sec)(dBA)Residential Day 60 50 55 60 n/aEvening 50 45 50 50 n/aNight 45 40 45 45 55TAFE When in use 45 n/a n/a 55 5 n/a(internal)Commercial When in use 65 n/a n/a 65 n/aPremisesCourt Room When in use 35 n/a n/a 76 6 n/a(internal)Note 1: DECCW Governing Periods - Day: 7.00 am to 6.00 pm, Evening: 6.00 pm to 10.00 pm,Night: 10.00 pm to 7.00 am.Note 2: ANL Acceptable Noise Level for an urban areaNote 3: RBL Rating Background Level from existing environment estimation as described in Section 5.2.Note 4: Site observations and attended measurements indicated high levels of road traffic noise and no significant noisegenerating industrial sources at the receiver location hence the Amenity criteria is the same as the ANL unlessotherwise stated.Note 5: External noise level to give internal noise level of 45 dBA based on a 10 dBA reduction for typical buildingconstruction with no special acoustic treatment and windows sufficiently open for ventilation.Note 6: External noise level to give AS 2107:2000 internal Court Room noise level of 35 dBA based on calculated overallnoise reduction of 41 dBA from outside to inside for the Court Rooms as discussed in Section 4.2.Heggies Pty LtdA member of SLR Group
Commuter Car Park and Interchange Program 17 Report Number 610.08297Mount Druitt Commuter Car Park29-Nov-2010Noise and Vibration Impact Assessment Revision 15.4 Car Park Operational Noise AssessmentAcoustic modeling of the carpark noise emissions has been carried out using the methodology ofBayerisches Landesamt für Umwelt’s report Parking Area Noise. Input data on the assumed numberof vehicle movements for noise modeling purposes are described in Section 1 and Section 2. TheParking Area Noise prediction methodology utilises an LAeq based source sound power level that isrepresentative of the movement of one complete vehicle movement in one hour (i.e. entering the carpark, searching for a car parking space, open and closing car doors, re-starting the engine and exitingthe car park). Hence the major variables accounted for in this methodology include the number ofvehicle movements, the location of the car park relative to noise sensitive receivers and the surfacefinish (eg sealed asphalt, unsealed gravel etc).Predicted noise levels from the operation of the proposed car park are presented in Table 10.Table 10 Predicted Noise Levels at Nearest Sensitive ReceiversReceiverType ofReceiverPeriodNoise Level dBAPredicted noise levelINP CriteriaExceedance(dBA)LAeq15min Laeq(period)Intrusive Amenity Intrusive AmenityLAeq(15minute)Criterion forNewSourcesLAeq(Period)Criterionfor NewSources1. 3 MountStreet2. 59North Pde(CourtHouse)3. NSWTAFE –WesternSydney4.BeamesAveCommercialCommercialCommercialResidenceWhen inuse(Daytime)When inuse(Daytime)When inuse(Daytime)n/a 59 n/a 65 n/a niln/a 55 n/a 76 n/a niln/a 49 n/a 55 n/a nilDaytime 44 40 55 60 nil nilEvening - - 50 50 n/a n/aNight 37 32 45 45 nil nilNote 1:Noise levels for the evening period are not covered in the parking Area Noise prediction methodology and aretherefore not providedIt is noted that the predicted operational noise levels at the nearest sensitive receivers comply with theproject noise goals. On the basis that the car park noise levels are predicted to comply with the noiselimits during the daytime and night-time periods, it can safely be assumed that the noise levels duringthe evening period are unlikely to be excessive.With regard to short-term noise events such as door closings, cars accelerating, engine starts etc,spreadsheet noise propagation calculations have been undertaken in order to predict the LA1(60second)noise levels from such activities at the nearest sensitive receivers. The LA1(60second) may be likenedto the typical maximum noise level of a particular event. The LA1(60second) noise levels are used todetermine whether a particular noise event has the potential to cause sleep disturbance. Thepredicted LA1(60second) noise levels are presented in Table 11.Heggies Pty LtdA member of SLR Group
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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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