Warrawee Substation - Review of Environmental Factors

Assessment of the environmental impacts and risksLocationDistance(m)PredictedNoiseLevels L Aeq,15minRBL, dBA,night time(10pm-7am)IntrusiveCriteria,night time(10pm-7am)Complies61 Brentwood Ave 44 19 31 36 Yes63 Brentwood Ave 46 19 31 36 Yes65 Brentwood Ave 70 15 31 36 Yes15 Winton Rd 40 25 33 38 Yes17 Winton Rd 36 26 33 38 YesAs seen in Table 3.11, the operational noise levels of the proposal would be within theintrusive criteria (night time criteria) and within most cases are within the existingbackground noise levels.3.5.4 Recommended control measuresPlan works to start at 7am such to avoid the need to comply with night time criteriaand sleep disturbance criteria.Noise emission levels of all critical items of mobile plant and equipment should bechecked for compliance with noise limits appropriate to those items prior to theequipment going into regular service. To this end, a testing regime should beestablished with the principal contractor using manufacturer data where possible.All fixed plant and stationary mobile plant at the work sites should be appropriatelyselected, and where feasible, fitted with silencers, acoustical enclosures and othernoise attenuation measures.Erection of a 2.4 metre high plywood noise barrier around the site (includingcompound) to attenuate levels of construction should be considered duringconstruction planning, as this would potentially contribute up to a 10dB attenuationof noise levels at receiver. However, due to the topography of the site, use of noisebarriers on site may only provide limited benefit.Limit usage of hydraulic hammers whenever possible and instead use rock sawsand rippers; or if necessary utilise quiet ‘city hammers’ as appropriate.Ensure that truck movements along the work site are performed in an efficientmanner to minimise the need for reversing, therefore minimising reversing alarmnoise, and use smart reversing alarms or squawkers in place of traditionalreversing alarms for all mobile plant to minimise the intrusiveness of reversingalarms.Conduct a combination of attended and unattended noise monitoring of worksduring the initial stages especially ‘Out-Of-Hours’ works at the closest receivers torecord typical levels at the residential receivers.Warrawee Substation Project/Review of Environmental FactorsPage 35 of 64