mr frank owen - borough of burnley 0162... · mr frank owen hamildon road, hapton burnley noise...

MR FRANK OWEN HAMILDON ROAD, HAPTON

BURNLEY

NOISE IMPACT ASSESSMENT R1203-REP01-PB 7 APRIL 2016

RED ACOUSTICS LIMITED Unit 8 Cable Court, Pittman Way Preston PR2 (YW T 01772 722 182 F 01772 722 451

[email protected] www.redacoustics.co.uk Registered Company Number 6460126

TECKLEMOUNT, HAMILDON ROAD, HAPTON

HELICOPTER NOISE IMPACT ASSESSMENT - R1203-REP01-PB

REPORT DETAILS

Project Proposed Helicopter Hangar and Helipad,

Hamildon Road,

Burnley

Client Mr Frank Owen

Document Reference R0825-REP01-PB

Date Issued 7 April 2016

Revision A

Issued By Johnathan Whittle BSc (Hons) Pg. Dip IOA AMIOA MCIEH

Red Acoustics Limited

Unit 8 Cable Court, Pittman Way, Preston PR2 9YW

T: 01772 722 182

F: 01772 722 451

M: 07720 405 006

[email protected]

Signed

Checked by Paul Bentley BSc (Hons), MSc, Pg.Dip., AMIOA

Signed

"

The survey was conducted and this report has been prepared for the private and confidential use of Mr Frank Owen only and cannot be reproduced in whole or in part or relied upon by any third party for any use whatsoever without the express written authorisation of Red Acoustics Limited. If any third party whatsoever comes into possession of this report, they rely on it at their own risk and Red Acoustics

Limited accepts no responsibility (including in negligence) to any such third party

mailto:[email protected]



SUMMARY

Red Acoustics has been commissioned by Mr Frank Owen to provide an assessment of the noise associated with the use of his private helicopter at his own dwelling at Tecklemont, Hamildon Road, Hapton.

This report presents the results of a ambient noise survey which was carried out at a location representative of the nearest identified noise sensitive receptor, source noise measurements of the private helicopter landing, idling and taking off and noise predictions using CadnaA 3D noise modelling software of the helicopter taking off and turning North and South before turning West.

The maximum LAeq,1s has been used to determine the Sound Power Level of the helicopter and this data has been used in CadnaA utilising the pass-by level function.

The impact assessment has looked at the pass-by levels at five identified receptors for three different flight paths. The period LAeq,t has been calculated form the 1 second pass-by data and then this data has been used to calculate a 12hr LAeq to determine the impact.

Based on one take-off and landing each day the impact is predicted to be minor to a greater number of receptors if a take-off vector to the North East is used with a turn back to the West. Low impact is predicted (apart from receptor 1) if a take-off/landing to the South East with a turn to a West is used.

Ground idling prior to and after landing is considered not to be significant over a 12 hour period.



CONTENTS

1.0 INTRODUCTION 1

2.0 SITE & ACTIVITY DESCRIPTION 2

FIGURE 2.1: SITE LOCATION PLAN 2

3.0 PROPOSED METHODOLOGY 4

4.0 ENVIRONMENTAL NOISE SURVEY RESULTS 5

FIGURE 4.1: AMBIENT LAEQ,5MIN SURVEY RESULTS 5

FIGURE 4.2: AMBIENT LA90,5MIN SURVEY RESULTS 6

FIGURE 4.3: HELICOPTER GROUND IDLING AT 8M DISTANCE FROM ROTOR HUB 7

FIGURE 4.4: TAKE OFF & LANDING MEASUREMENT 7

5.0 CADNAA NOISE MODELLING RESULTS 8

FIGURE 5.1: ASSUMED FLIGHT-PATHS 8

TABLE 5.1: CALCULATED SOUND POWER LEVELS 9

TABLE 5.2: GROUND IDLING PREDICTION RESULTS 9

FIGURE 5.2: RECEPTOR 1 PASS-BY RESULTS 10





6.0 NOISE IMPACT ASSESSMENT 13

TABLE 6.1: IMPACT ASSESSMENT MATRIX 13

TABLE 6.2: GROUND IDLING IMPACT ASSESSMENT 13

TABLE 6.3: PASS-BY IMPACT ASSESSMENT 13

7.0 CONCLUSION 15

APPENDIX A: NOISE SURVEY DETAILS 16

TABLE A1: INSTRUMENTATION 17



1.0 INTRODUCTION

Red Acoustics has been commissioned by Frank Owen to provide an assessment of the noise associated with the use of a private helicopter at Tecklemont, Hamildon Road, Hapton.

Red Acoustics has carried out the following assessments:

• Conduct ambient noise measurements at a position representative of the nearest noise sensitive receptor.

• Conduct source noise measurements of the residents private helicopter idling on the pad, taking off and landing.

• Using source noise measurements and geographical data build a noise propagation model in CadnaA 3D noise modelling software to predict pass-by levels from the helicopter movements and ground idling.

• Using the results from the modelling, compare these to the the impact assessment matrix proposed to determine the impact from the proposed helicopter use.

Page " of "1 17



2.0 SITE & ACTIVITY DESCRIPTION

The proposed site is the clients private dwelling off Hamildon Road, Hapton. Figure 2.1 presents the site location plan.

Figure 2.1: Site Location Plan

Page " of "2 17

MP1 & Co-Located Weather Kit



The proposal is to build a helicopter hangar to house the helicopter and also a landing pad for the helicopter to depart from and arrive back at.

Light maintenance is proposed in the hangar but this will be limited to the use of hand tools. In comparison with the take offs and landings this activity is is considered insignificant and is not assessed as part of this report.

The operation of the helicopter will only take place during day-light hours which we have been advised will be between 07:00 19:00hrs Monday - Sunday and 365 days per year.

In reality the resident has indicated that over the last several years the use of the helicopter has been limited to, on average, no more than once per week.

Page " of "3 17



3.0 PROPOSED METHODOLOGY

To assess impact from the proposed use of the helicopter the following methodology was adopted:

• Undertake ambient noise measurements at a position representative of the nearest noise sensitive property.

• Undertake source noise measurements of the helicopter idling on the ground, taking-off and landing. Using the highest LAeq,1s use the following equation to calculate the sound power level for each event:

Lw = Lp + 20 x Log10(r) + 8

Where: Lp is maximum measured LAeq,1s from each event

r is the distance the source measurements were taken at from the hub (measured at 8m)

• Using the calculated Lw for the helicopter idling and taking off/landing; predict the facade noise level at the nearest sensitive receptors for the scenarios below. The scenarios were chosen to represent the helicopter turning West towards the M65 or carrying on in a Easterly direction. The proposed flightpaths are set to keep the number of properties overflown to a minimum

• Idling at ground level with a source height of 2.5m on a reflecting surface.

• Assuming a south westerly wind, take-off with an ascent from 0m to 6m backing away from the site (easterly direction) and lifts to 150m heading North East and turns anti-clockwise back round on a Westerly heading

• Assuming a south westerly wind, take-off with an ascent from 0m to 6m backing away from the site (easterly direction) and lifts to 150m heading East and continuing towards the East.

• Assuming a south westerly wind, take-off with an ascent from 0m to 6m backing away from the site (easterly direction) and lifts to 150m heading South East and turns clockwise back round on a Westerly heading

Page " of "4 17



4.0 ENVIRONMENTAL NOISE SURVEY RESULTS

In order to determine the prevailing environmental noise levels at the site, unmanned surveys were conducted by Red Acoustics Ltd at the site between the 26th and 29th February 2016

The noise climate around the site was generally quiet but the prevailing sources of noise were local traffic movements and distant traffic on the nearby A6709 Accrington Road.

Figure 4.1 and Figure 4.2 detail the results of the ambient noise measurements undertaken at position MP1 (as shown in Figure 2.1) as measured during a weekday and weekend period respectively.

Figure 4.1: Ambient LAeq,5min Survey Results

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Figure 4.2: Ambient LA90,5min Survey Results

"

Figure 4.3 - 4.4 shows the results of the helicopter idling, taking off and landing again measured with a 1 second time base. This measurement was taken on 25th February 2016. The idling was measured 8m from the hub at four positions around the helicopter and the take off and landing measurement was made at the starboard measurement position for the ground idling.

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Figure 4.3: Helicopter Ground Idling at 8m Distance from Rotor Hub

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Figure 4.4: Take off & Landing Measurement

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Page " of "7 17



5.0 CADNAA NOISE MODELLING RESULTS

CadnaA has been used to predict the resulting noise levels at the nearest sensitive receptors. These receptors have been defined as the facade of the nearest residential property to the proposed site.

The model has been used to predict the helicopter idling, taking-off/landing and traveling along an assumed flight-path to the North and South with a Westerly turn towards the M65 and a departure to the East. Figure 5.1 shows the assumed flight paths based on information provided by the client. The flight-paths have been assumed to reach a height of 150m prior to making a turn and transitioning into flight.

Figure 5.1: Assumed Flight-Paths

"

Based on the survey data in Section 4.0 the Sound Power levels in Table 5.1 have have been calculated.

Page " of "8 17



Table 5.1: Calculated Sound Power Levels

Using the flight-paths above and the Sound Power Levels the ground idling noise and the pass-by level for each flight-path has been predicted. Table 5.2 presents the ground idling prediction and The idling is presented as LAeq,30sec to account for the idling time on the pad prior to take-off indicated by the client.

Table 5.2: Ground Idling Prediction Results

Figure 5.2 - 5.6 presents the pass-by levels for each receptor and flight path.

Scenario Highest Measured LAeq,1s dB Calculated Sound Power Level dB

Idling on helipad 94.9 120.9

Take-off, Landing & In-Flight 108.1 134.1

LAeq,30sec dB LAeq,12hr dB

Receptor 1 60.5 28.9





Page " of "9 17



Figure 5.2: Receptor 1 Pass-by Results

"


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69.7dB LAeq,131s

71.8dB LAeq,72s 71.1dB LAeq,117s

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6.0 NOISE IMPACT ASSESSMENT

To assess the impact of the helicopter idling, taking off and landing the matrix in Table 6.1 is proposed. Table 6.2 - 6.3 presents the impact assessment based on the results predicted by CadnaA.

Table 6.1: Impact Assessment Matrix

Table 6.2: Ground Idling Impact Assessment

From the ground idling assessment it can be seen the impact is expected to be low for all receptors.

Table 6.3: Pass-by Impact Assessment

Low Impact Target Minor Impact Major Impact

≤45dB LAeq,12hr 45-50dB LAeq,12hr >50dB LAeq,12hr

LAeq,12hr dB Impact

Receptor 1 28.9 Low

Receptor 2 24.7 Low

Receptor 3 21.7 Low

Receptor 4 13.3 Low

Receptor 5 19.1 Low

Flight Path 1 Flight Path 2 Flight Path 3

Result Impact Result Impact Result Impact

Receptor 1 LAeq,12hr

47.5 Minor 47.1 Minor 48.4 Minor


48.8 Minor 41.9 Low 43.2 Low


47.1 Minor 39.4 Low 41.4 Low


40.8 Low 39.9 Low 46.6 Low


41.2 Low 41.5 Low 38.5 Low

Page " of "13 17



From the pass-by impact assessment its can be seen there is a minor impact on Receptor 1 for all flight-paths and minor impact on Receptors 2 and 3 for Flight path 1. The remaining receptors have a low impact for all flight paths.

We would therefore recommend where possible that flight path 2 and 3 are chosen to exit the vicinity until cruising altitude is reached as this results in the least amount of dwellings being affected.

Page " of "14 17



7.0 CONCLUSION

An assessment of the noise generated by the proposed use of the clients private helicopter at his dwelling has been undertaken.

The assessment indicates that when taken into context over a 12hr daytime period with one landing and take-off a day, the impact of the helicopter on surrounding properties is likely to be minor to low.

We have however recommend a preferred flight path for departure to ensure that the impact is reduced to low on as many nearby receptors as possible.

Page " of "15 17



APPENDIX A: NOISE SURVEY DETAILS

Location

Tecklemount, Hambledon Road, Hapton

Survey Dates

Source measurements - 25th February 2016

Background Survey - 26th Feb 2016 to 29th Feb 2016

Weather

A weather station was deployed with the unattended sound level meter. The weather during the survey period was dry with wind speeds <5ms-1

Personnel

Paul Bentley - Red Acoustics Limited

John Whittle - Red Acoustic Ltd

Page " of "16 17



Table A1: Instrumentation

Copies of calibration can be made available if requested.

Methodology

Before and after the measurements the SLM was was check calibrated to an accuracy of ±0.3dB using the Norsonic Type 1251 Calibrator. The calibrator produces a sound pressure level of 114 dB re 2x10-5 Pa @ 1kHz

Kit NoEquipment Description

Type Number

ManufacturerSerial

Number

Date of Last

Calibration

Calibration Certificate

Number

Calibration Due

RED 09

(Source Measurements)

Sound Level Meter

Type 140 Type 1 Norsonic 1402793 12/05/15 18739 12/05/17

Preamplifier Nor 1209 Norsonic 12152 12/05/15 18739 12/05/17

Microphone Capsule Nor 1225 Norsonic 72874 12/05/15 18738 12/05/17

Sound Calibrator

Type 1251 Class 1 Norsonic 30873 09/04/15 2220155245 09/04/16

RED 08 (Backgro

und Survey)

Sound Level Meter

SVAN 957 Type 1 SVANTEK 28042 17-Feb-15 Factory Feb-17

Preamplifier SVAN SV12L SVANTEK 31143 17-Feb-15 Factory Feb-17

Microphone Capsule SVAN 7052E SVANTEK 53617 17-Feb-15 Factory Feb-17

RED 07&08

Sound Calibrator

Type 1251 IEC

60942-1997 Class 1

Norsonic 32273 09-Apr-14 15989 09-Apr-15

Page " of "17 17

mr frank owen - borough of burnley 0162... · mr frank owen hamildon road, hapton burnley noise...

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