Newlands Cross Upgrade EIS - European Investment Bank

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South Dublin County Council N7 Newlands Cross Upgrade Environmental Impact Statement 8. NOISE & VIBRATION 8.1 Introduction & Methodology Arup Consulting Engineers 8.1.1 Introduction This chapter of the Environmental Impact Statement (EIS) assesses the impacts of noise and vibration associated with both the construction and operational phases of the proposed Newlands Cross overpass. The proposed Scheme will remove the existing Newlands Cross junction and upgrade it to a free-flowing overpass system on the N7. A number of existing residential properties are located to the north of the proposed scheme. This noise assessment follows the standard practice of adopting the traffic noise design goal contained within the NRA document Guidelines for the Treatment of Noise and Vibration in National Road Schemes 1 . 8.1.2 Methodology The first stage is to assess and quantify the noise environment in the vicinity of sensitive receptors that may be affected by the proposed development. In the case of a road scheme, the selected noise-sensitive locations are likely to be those in closest proximity to the proposed road. Both the construction and operational phases of the scheme should be reviewed when selecting appropriate measurement locations. Where possible, the noise levels resulting from both the construction and operational phases are then calculated using established prediction techniques. Refer to section 8.5 for further discussion of construction noise. The noise levels associated with the operational phase of the proposed development were predicted in accordance with guidance set out in Calculation of Road Traffic Noise (CRTN)2, giving results in the form of LA10(18hour) values. These are then converted to Lden values in accordance with the procedures detailed in the NRA guidance. The derived values for Lden should be rounded to the nearest whole number, with 0.5 being rounded up. The predicted values are then assessed against the three conditions set out in section 8.1.3 in order to assess the need for mitigation measures. 8.1.3 Standards and Guidelines For new roads in Ireland, it is standard practice to the adopt traffic noise design goal contained within the NRA guidelines. This document specifies that the Authority (i.e. NRA) consider it appropriate to set the following design goal for Ireland: • day-evening-night 60dB Lden (free-field residential façade criterion) This design goal represents a more onerous limit value than those that have typically been employed in Ireland to date 3 . Note that this design goal applies only at residential dwellings. The application of this criterion at any non-residential locations in the vicinity of the scheme is at the discretion of South Dublin County Council and the NRA. Noise mitigation measures are deemed necessary whenever all of the following three conditions are satisfied: December 2007 Page 117
South Dublin County Council N7 Newlands Cross Upgrade Environmental Impact Statement Arup Consulting Engineers (a) the combined expected maximum traffic noise level, i.e. the relevant noise level, from the proposed road scheme together with other traffic in the vicinity is greater than the design goal, and; (b) the relevant noise level is at least 1dB more than the expected traffic noise level without the proposed road scheme in place, and; (c) the contribution to the increase in the relevant noise level from the proposed road scheme is at least 1dB. These conditions will ensure that mitigation measures arising out of this process are based upon the impact of the scheme under consideration. This Design Goal is applicable to new road schemes only. In EIS terms, this means that it is to be applied to existing receptors in respect of both the opening year and the design year (i.e. 15 years after projected year of opening). Note in this case, a case design year of 2025 has been assessed. It is stated that the Authority acknowledges that it may not always be sustainable to achieve this design goal. In such circumstances, nevertheless, a structured approach should be taken in order to ameliorate as far as practicable road traffic noise through the consideration of measures such as alignment changes, barrier type (e.g. earth mounds) or low noise road surfaces. 8.2 Description of Existing Conditions 8.2.1 Environmental Noise Survey Environmental noise surveys were conducted in order to quantify the existing noise environment in the vicinity of noise-sensitive locations that may be affected by the proposed road development. 8.2.2 Methodology Unattended Measurement Procedure The unattended measurements were conducted using a Brüel & Kjær Type 3592 Environmental Kit, a Brüel & Kjær Type 2238 Sound Level Meter. The measurement apparatus was check calibrated before and after the survey using a Brüel & Kjær Type 4231 Sound Level Calibrator. The results were saved to the instrument memory for later analysis. Unmanned continuous measurements were conducted over 24-hour periods at one location. LA10(18hour) values are derived from the results of the continuous monitoring by taking the arithmetic average of the eighteen hourly sample values between 06:00hrs and 24:00hrs. Lden values are derived directly from the measured data. Attended Measurement Procedure The attended measurements were performed using Brüel & Kjær Type 2250 Sound Level Meter. Short-term measurements were conducted at survey locations on a cyclical basis. Sample periods were 15 minutes. The results were noted onto a Survey Record Sheet immediately following each sample, and were also saved to the instrument memory for later analysis where appropriate. Survey personnel noted all primary noise sources contributing to noise build-up. The bulk of the survey work was conducted in accordance with the attended measurement procedure as specified in the NRA Guidance. December 2007 Page 118
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PLATES
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APPENDIX A5 - TRAFFIC AND TRANSPORT
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South Dublin County Council Newland
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0 kilometres 2 Scale N.T.S Ordnance
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APPENDIX A8 - NOISE AND VIBRATION
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APPENDIX A9 - AIR QUALITY
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APPENDIX A11 - ECOLOGY
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APPENDIX A12 - ARCHAEOLOGY, ARCHITE
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