Holroyd to Rookwood Road cable REF - TransGrid

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CONSTRUCTION NOISE & VIBRATION Page 13 42.6590.R1:CFCD5 QUALITATIVE ASSESSMENT Rev04 330kV ELECTRICITY CABLE HOLROYD to ROOKWOOD ROAD January 2012 Table 6: Plant and Equipment (cont.) dB(A) re: 20 x 10 -6 Pa. Item Plant Description Sound Pressure Level @ 7 metres Generator Diesel 79 Spraying Machine 75 Mechanical Broom 83 Concrete Truck 83 Concrete Pump 84 Concrete Vibrators 80 Concrete Saw 93 Welders 85 4.5 Construction Noise Assessment 4.5.1 Trenching and Cable Work It is envisaged that the main trenching and cable laying activities will be undertaken during normal daytime working hours, being between 7.00am and 6.00pm Monday to Friday, and 7.00am to 1.00pm Saturday. Due to site constraints some night-time or weekend works may be necessary. In these situations notification would be provided to residents, Council and DECCW prior to conducting the works. Noise levels resulting from the envisaged construction activities during the trenching and cable laying will vary due to the transient nature and range of plant and equipment. Considering the likely worse case scenario, Table 7 presents the results of the noise level predictions for the five (5) main stages of the construction works. Under most situations however, construction noise levels will be less than those presented below. As the activities are short term and transient any likely noise impacts would be considered to be minimal. PERRAM & PARTNERS ATKINS ACOUSTICS
CONSTRUCTION NOISE & VIBRATION Page 14 42.6590.R1:CFCD5 QUALITATIVE ASSESSMENT Rev04 330kV ELECTRICITY CABLE HOLROYD to ROOKWOOD ROAD January 2012 Table 7: Predicted Noise Levels from Construction Activities L10 dB(A) re: 20 x 10 -6 Pa Distance from Sound Pressure Level Construction dB(A) Activity Concrete Rock breaker Trenching Cable Backfilling (m) Saw Laying 15 87 91 85 79 86 40 78 82 76 70 77 80 72 76 70 64 71 100 70 74 68 62 69 150 67 71 65 59 66 300 61 65 59 53 60 4.5.1(a) Assessment The noise levels predicted for the trenching and cable laying activities (Table 7) would exceed a normal ICNG qualitative noise management level for activities three (3) weeks or longer, of LA90 +10dB at residential properties within 150 metres of the construction activities. As the typical cable laying construction activities are transient are not expected to exceed 4 - 5 days in total at any one location, any noise impact would likely be managed. Where practical and feasible, engineering noise controls and work practices will be considered to minimise noise impacts (Section 5). The construction activities would normally be restricted to the daytime hours 7.00am to 6.00pm. Monday to Friday, and 7.00am to 1.00pm Saturday. For any construction activities outside normal daytime hours, notification will be provided to residents, Council and DECCW prior to commencing the works. 4.5.2 Micro Tunnelling Noise levels from the micro tunnelling activities will vary due to the nature of the activities and range of plant and equipment that could be used. Considering the envisaged activities, Table 8 presents a summary of the predicted noise levels for each phase of the micro tunnelling operations. PERRAM & PARTNERS ATKINS ACOUSTICS
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Holroyd to Rookwood Road cable REF - TransGrid

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