noise and vibration management plan - planning … · noise and vibration management plan ... 1.10...

DO

CU

ME

NT

8.8

July 2016Application Ref: EN020017

Noise and Vibration Management PlanNational Grid (Richborough Connection Project) Order Regulation 5(2)(q) of the Infrastructure Planning (Applications: Prescribed Forms and Procedure) Regulations 2009

Page intentionally blank

Richborough Connection Project

Volume 8

8.8 Noise and Vibration Management Plan

National Grid National Grid House Warwick Technology Park Gallows Hill Warwick CV34 6DA July 2016

Richborough Connection Project – Volume 8, Document 8.8

Final July 2016



Final July 2016

Document Control

Document Properties

Organisation Arcadis

Author Michael Van Der Merwe

Approved by

Title Noise and Vibration Management Plan

Document Reference 8.8

Version History

Date Version Status Description/Changes

12/02/2016 1 Draft

24/02/2016 2 Draft Addressing comments

01/02/2016 3 Draft Appendices added

10/05/2016 4 Draft Updated following meeting with Local Authority EHOs

14/07/2016 5 Final Updated for Deadline 2 to address comments from Local Planning Authorities


Final July 2016



Final i July 2016

Table of Contents

1.1 INTRODUCTION 1

1.2 DESCRIPTION OF WORKS 2

1.3 NOISE LIMITS 2

1.4 WORKING HOURS 4

1.5 NOISE CONTROL MEASURES 5

1.6 SECTION 61 CONSENT APPLICATIONS 10

1.7 PUBLIC NOTIFICATIONS AND COMMUNICATIONS 13

1.8 NOISE INSULATION AND TEMPORARY RE-HOUSING 14

1.9 VIBRATION ACTION LEVELS 16

1.10 NOISE AND VIBRATION MONITORING 16

1.11 SUITABLY QUALIFIED PERSONS AND TRAINING 17

1.12 AUDIT AND REPORTING 18

1.13 APPENDIX 1 19

1.14 APPENDIX 2 25


Final ii July 2016



Final 1 July 2016

1.1 INTRODUCTION

1.1.1 This Noise and Vibration Management Plan (NVMP) incorporates the measures proposed and procedures for the management of noise and vibration arising from the construction of the Richborough Connection project in accordance with section 4.9 of the Construction Environmental Management Plan (CEMP; Document 5.4.3C(A)).

1.1.2 This NVMP has been prepared by Arcadis on behalf of National Grid. The NVMP describes the noise and vibration control measures for all work activities associated with the construction of the proposed 400kV overhead line connection between Canterbury and Richborough and the removal of the existing 132kV PX route overhead line.

1.1.3 The NVMP addresses the impact of noise and vibration and the control measures employed to mitigate the risks. These are supported through monitoring procedures to identify both elevated levels and review complaints should they arise. The complaints management procedure including the management responsibilities are also addressed.

1.1.4 This Plan provides further detail on the principles for noise and vibration management as outlined in the following documents contained within the Development Consent Order (DCO) application:

Chapter 11 Noise and Vibration of the Environmental Statement (ES; Document 5.2; Part 2 of 2);

Statement of Statutory Nuisance (Document 5.6);

Construction Environmental Management Plan (Document 5.4.3C); and

Draft Development Consent Order (Document 2.1).

1.1.5 This plan aims to assist in complying with the following legislation and guidance and should be read in conjunction with:

Environmental Protection Act 1990 (as amended);

Control of Pollution Act 1974; and

British Standard (BS) 5228 'Code of practice for noise and vibration control on construction and open sites', Part 1: Noise (+A1:2014), and Part 2: Vibration (+A1:2014).

1.1.6 The production and agreement of a NVMP prior to construction works commencing is required under Requirement 6 of the draft DCO (Doc 2.1(A)). It is however proposed that if this Plan can be agreed prior to, or during, the DCO examination that it could instead fall as a Plan under Requirement 5: Construction Environmental Management Plan and therefore certified under Article 44: Certification of Plans etc by the Secretary of State for the Department of Energy and Climate Change.

1.1.7 The main works contractor will be responsible for the delivery of the measures outlined in this Plan. This will be secured through the contractual documentation and monitored by National Grid.

1.1.8 This remainder of this plan outlines the following measures::

working hours;


Final 2 July 2016

procedures for gaining Section 61 consents under the Control of Pollution Act 1974;

general noise and vibration control measures in accordance with best practicable means (BPM) principles;

public notifications and complaints handling;

definition and triggers for noise insulation and temporary re-housing;

site / activity specific noise control measures (see section 1.3 and section 1.5); and

monitoring.

1.2 DESCRIPTION OF WORKS

1.2.1 The proposed development is made up of:

A new 400kV overhead line between Richborough 400kV and Canterbury North 400kV Substations (to be known as the PC route). This would be approximately 20km long and would be built using 45 standard lattice pylons and 15 low height lattice pylons (60 pylons in total).

A permanent diversion of an existing lower voltage 132kV overhead line (known as the PY route). This would enable the new 400kV overhead line to be constructed above the existing lower voltage overhead line, and would be done by building six new pylons, four of which are a different height so that the new 400kV overhead line could then be built. In addition to the removal of two pylons of existing lower voltage 132kV overhead line on the PY route due to the permanent diversion.

Three temporary diversions where the new 400kV overhead line would cross over another existing lower voltage 132kV overhead line which runs from Richborough to Canterbury and is proposed to be removed as part of this project (known as the PX route). The PX route has to keep transferring electricity whilst the new 400kV overhead line is being built. To maintain local electricity supplies the PX route would be lowered onto wooden poles so that the new 400kV overhead line can be built over the top of this line.

The removal of 20.6km (79 pylons) of existing lower voltage 132kV overhead line, the PX route (and its temporary diversions) which runs between Richborough 132kV Substation and Canterbury South 132kV Substation.

Other works, for example, temporary access roads to reach pylon construction and demolition areas, bridge structures, highway works, construction compounds, protective scaffold structures, pylon work sites and ancillary works.

1.3 NOISE LIMITS

1.3.1 Noise significance thresholds and construction noise limits at sensitive receptors have been identified based on BS 5228-1 as outlined in the ES (Table 11.14) and summarised in Table 1.1.


Final 3 July 2016

Table 1.1 Significance threshold and noise limit for construction noise

Relevant time period from BS5228

Applicable time periods for the Project

Noise significance threshold dB LAeq,T

1

Noise limit dB LAeq,T

2

Daytime Weekdays 07.00 – 19.00 Saturday 07.00 – 13.00

Weekdays 07.00 – 19.00 Saturday 08.00 – 13.00

65 70

Evenings and Weekends Weekdays 19.00 – 23.00 Saturday 13.00 - 19.00 Sunday 07.00 – 19.00

Saturday 13.00-17.00 Sunday 08.00-17.00

55 60

Night-time Weekdays 23.00-07.00 Weekends 19.00 – 07.00

Not relevant other than for the activities outlined in 1.4.5

45 50

1.Noise significance criteria based on BS5228 significance criteria in Annex E (ABC Method)

2.Based on criteria in BS5228

1.3.2 Generally construction works will take place distant to sensitive receptor locations. Construction noise attenuates with distance from source. Noise predictions in the ES (Table 11.15) indicates that where works take place beyond 60m from a sensitive receptor, all construction activities will be within the daytime noise limit of 70dB(A). Beyond 170m from any construction works the noise limit of 60dB(A) for weekends (Saturday 13:00-19:00 and Sunday 07:00-19:00) would not be exceeded at any receptors. The ES predictions do not consider screening from topographical features, buildings and other structures. The highest construction noise impacts will therefore be confined to works that take place in close proximity to receptor locations.

1.3.3 A list of construction activities taking place within 100m of residential receptor locations, therefore presenting the highest construction noise impacts, is shown in Appendix 1.

1.3.4 The contractor will adopt best practicable means (BPM) to ensure compliance with the construction noise limits set out in Table 1.1. Noise control measures set out in Section 1.5 will ensure these limits are achieved.

1.3.5 A combination of mitigation measures may be needed to achieve the noise limits set out in Table 1.1, particularly where construction activities take place within 60m of receptor locations. Receptors within very close proximity to construction works are set out in Appendix 1.

1.3.6 It is proposed that for activities that are located particularly close to receptor locations and potentially present a high noise impact are subject to Restricted Working Hours as set out in Section 1.6, Table 1.3.


Final 4 July 2016

1.3.7 In circumstances where despite implementing BPM (as per provisions in Section 79(9) of the Environmental Protection Act 1990, see paragraph 1.5.1 below) the noise limits in Table 1.1 are not achieved, or works are outside the core or restricted working hours outlined in section 1.4 Section 61 applications will be made (see section 1.6 for further details).

1.4 WORKING HOURS

1.4.1 The control of working hours is key to ensuring noise and vibration impacts are only experienced during defined working hours.

1.4.2 The contractor will carry out the works in such a way as to limit the adverse noise and vibration impact of the construction activities. Therefore, as far as practicable, works will only be undertaken during the DCO Core Working Hours.

1.4.3 The Core Working Hours are set out in the draft DCO Schedule 3, Requirement 7 (Doc 2.1(A)):

7.—(1) Subject to sub-paragraphs (2) and (3) construction work must only take place between 0700 and 1900 Mondays to Fridays and between 0800 and 1700 on Saturdays, Sundays and Bank Holidays (the core working hours), unless otherwise approved by the relevant planning authority.

1.4.4 Working on a consecutive Saturday and Sunday can only take place on two out of any four consecutive weekends in each relevant local authority area, unless otherwise approved by the relevant planning authority (sub-paragraph 2).

1.4.5 The following minor operations may take place outside the Core Working Hours due to stakeholder operational or safety requirements (sub-paragraph 3) and are considered low noise generating activities:

a. the installation and removal of conductors, pilot wires and associated protective netting across highways, railway lines or watercourses;

b. the completion of operations commenced during the core working hours which cannot safely be stopped;

c. any highway works requested by the relevant highway authority to be undertaken on a Saturday or a Sunday or outside the core working hours;

d. security monitoring;

e. the testing or commissioning of any electrical plant installed as part of the authorised development; and

f. The completion of works delayed or held up by severe weather conditions which disrupted or interrupted normal construction activities.

1.4.6 These DCO working hours are referred to as the “Core Working Hours” throughout this document. In some locations or for specific noisy activities working hours will be restricted to Monday to Friday, 07.00 – 19.00 inclusive. These hours are referred to as the “Restricted Working Hours” throughout this document.


Final 5 July 2016

1.5 NOISE CONTROL MEASURES

Best Practicable Means

1.5.1 General noise and vibration control measures are listed, with reference to British Standard (BS) 5228 'Code of practice for noise and vibration control on construction and open sites', Part 1: Noise (+A1:2014), and Part 2: Vibration (+A1:2014). The Contractor will use 'best practicable means' (BPM) to minimise nuisance from noise and vibration. BPM is defined by reference to the following provisions in Section 79(9) of the Environmental Protection Act 1990:

a. 'Practicable' means reasonably practicable having regard among other things to local conditions and circumstances, to the current state of technical knowledge and to the financial implications;

b. The means to be employed include the design, installation, maintenance and manner and periods of operation of plant and machinery, and the design, construction and maintenance of buildings and structures;

c. The test is to apply only so far as compatible with any duty imposed by law; and d. The test is to apply only so far as compatible with safety and safe working

conditions, and with the exigencies of any emergency or unforeseeable circumstances.

General Noise and Vibration Control Measures

1.5.2 All construction contractors will be required to follow standard good construction practice as outlined in BS 5228-1:2009+A1:2014 and BS 5228-2:2009+A1:2014. This will include the following measures:

a. Construction will be confined to Core Working Hours as identified in Section 1.4. Where activities are predicted to potentially exceed construction noise limits (see Table 1.1 in Section 1.3) at receptors for sensitive times of the day such as Saturday 13:00-17:00 or Sundays and Bank Holidays 08:00-17:00, these specific works will be confined to the Restricted Working Hours (i.e. Monday to Friday 07.00 to 19.00);

b. Careful selection of plant and construction methods. Only plant conforming to relevant national, EU or international standards, directives and recommendations on noise and vibration emissions will be used. The contractor will ensure that each item of plant used on the project complies with the noise limits quoted in the relevant European Commission Directive 2000/14/EC/United Kingdom Statutory Instrument (SI) 2001/1701 (as amended). The contractor’s Environmental Manager will maintain a register of plant and equipment and statutory certification;

c. Design and use of acoustic screening measures where practicable and necessary, at the earliest opportunity to meet the noise limits in Section 1.3. Acoustic screening measures include site hoardings, acoustic barriers, acoustic enclosures, acoustic housing for plant and temporary stockpiles. Such measures can be particularly appropriate for stationary or near-stationary plant such as pneumatic breakers, piling rigs and compressors. Barriers will be located as close to the plant as possible and, in order to provide adequate attenuation, and must have a mass per unit area of at least 7 kg/m2 (BS5228 recommends a minimum mass per unit area of 7 kg/m2). The greater the mass per unit area, the greater the attenuation achieved. Timber barriers for road traffic noise have a mass per unit area of 20 kg/m2.


Final 6 July 2016

d. All vehicles and mechanical plant used for the purpose of the work will be fitted with effective exhaust silencers and shall be maintained in good and efficient working order and operated to minimise noise emissions;

e. All compressors and generators will be "sound reduced" models fitted with properly lined and sealed acoustic covers which shall be kept closed whenever the machines are in use, and all pneumatic percussive tools will be fitted with mufflers or silencers of the type recommended by the manufacturers;

f. All machines in intermittent use will be shut down in the intervening periods between works or throttled down to a minimum. Lorry engines will be switched off when vehicles are stationary. Noise emitting equipment which is required to run continuously will be housed in a suitable acoustic enclosure;

g. As far as practicable, demolition or dismantling of the PX route will be carried out using equipment that breaks concrete on bending in preference to percussive methods;

h. Plant and equipment liable to create noise and/or vibration whilst in operation will, as far as reasonably practicable, be located away from sensitive receptors and away from walls which could reflect noise towards sensitive receptors;

i. Where reasonably practicable, fixed items of construction plant will be electrically powered in preference to diesel or petrol driven;

j. Vehicles will not wait or queue on the public highway with engines idling; construction traffic movements will be undertaken in accordance with the Construction Traffic Management Plan (CTMP) Doc 5.4.3G;

k. All appropriate Richborough Project staff and their contractor's personnel will be instructed on BPM measures to reduce noise and vibration as part of their induction training, and followed up by 'tool box' talks;

l. Noisy activities will be staggered in time and space where feasible;

m. Only designated access routes (on site) will be used;

n. Reversing alarms incorporating one of more of the features listed below or any other comparable system will be used where reasonably practicable:

Highly directional sounders;

Use of broad band signals;

Self-adjusting output sounders;

Flashing warning lights; and

Reversing alarms will be set to the minimum output noise level required for health and safety compliance; and

o. All site personnel will receive training appropriate to the nature of their roles and responsibility; the training will include specific information in relation to noise and vibration management. If their work activities are assessed as being particularly noise/vibration emission prone all staff will receive induction training that will incorporate environmental awareness training, plus specific training in relation to noise and vibration.

1.5.3 Typical mitigation measures and the associated sound reduction are set out in Table 1-2.


Final 7 July 2016

Table 1.2 Typical mitigation measures and associated sound reduction levels

Plant

Noise reduction of plant Alternative plant

Source of noise Possible remedies (to be discussed with machine manufacturers)

A-weighted sound reduction (dB)

Hammer drive piling equipment

Pneumatic/diesel hammer or steam

winch vibrator driver

Enclose hammer head and top of pile in acoustic

screen

5 to 10 dB

Bored piling Vibratory system

Sheet pile Acoustically dampen sheet steel piles to reduce levels

of resonant vibration

Drop hammer completely enclosed in box with

opening at top for crane access

Impact on pile Use resilient pad (dolly) between pile and hammer head. Packing needs to be

kept in good condition

Steel jacket completely enclosing drop hammer

with dolly and polystyrene chips fed to impact surface to dissipate

energy

Cranes cables, pile guides and

attachments

Careful alignment of pile and rig

Pressed-in piling which generates its driving force from the frictional restraint

of other piles

Power units or base machines

Fix more efficient sound reduction equipment or exhaust. Acoustically

Acoustically dampen panels and covers.

When intended by the

manufacturer, engine panels need to be kept

closed. Use acoustic screens when

possible

Earth-moving plant: • bulldozer • compactor • crane • dump truck • dumper • excavator • grader • loader • scraper

Engine Fit more efficient exhaust sound reduction equipment Manufacturers’ enclosure panels need to be kept

closed

5 to 10 Alternative super silenced plant might be available.

Consult manufacturers for details

Engine Fit more efficient sound reduction equipment

Super silenced plant is available


Final 8 July 2016

Plant




Compressors and generators

Compressor or generator body

shell

Acoustically dampen metal casing

Up to 10 dB

Electric-powered compressors are available

Manufacturers’ enclosure panels need to be kept

enclosed

Sound-reduced compressor or can be used to supply several

items of plant. Use centralised generator

system

Tool Fit suitably designed muffler or sound reduction equipment to reduce noise without impairing machine

efficiency

Up to 15

Hydraulic and electric tools are available

Ensure all leaks in air line are sealed

Thermic lance

Bit Use dampened bit to eliminate ringing

For large areas of concrete, machine designed to break

concrete in bending can be used

Total machine Erect acoustic screen between compressor or

generator and noise sensitive area. When possible, line of sight

between top of machine and reception point needs

to be obscured

Up to 10

Enclose breaker or rock drill in portable or fixed acoustic enclosure with

suitable ventilation

Rotary drills, diamond drilling and boring

Drive motor and bit

Use machine inside acoustic shed with

adequate ventilation

Up to 15 Thermic lance

Pumps Engine pulsing Use machine inside acoustic enclosure with

allowance for engine cooling and exhaust

Up to 20

Material handling

Impact of material Do not drop materials from excessive heights. Screen

Up to 15


Final 9 July 2016

Plant




dropping zones, especially on conveyor systems. Line

chutes and dump trucks with a resilient material

1.5.4 Table 1-2 indicates that implementing various mitigation measures will achieve cumulative sound reduction. In addition to the above measures, acoustic barriers are likely to achieve attenuation of 5 dB when the top of the plant is just visible to the receiver over the noise barrier, and of 10 dB when the noise screen completely hides the sources from the receiver.

1.5.5 Indicative unmitigated noise predictions are presented in Appendix 2 along with the suggested mitigation options required to meet the noise limits set out in Table 1.1.

Specific Noise and Vibration Control Measures

1.5.6 Following the noise assessment undertaken as part of the Environmental Impact Assessment and consultation with the relevant Environmental Health Officers a number of specific sensitive locations have been identified where additional restrictions will apply. These locations are where receptors are in close proximity to the works and the activities proposed have the potential to cause disruption. Due to the location specific nature of these works they cannot be located elsewhere i.e. removal of existing PX pylons and access roads to the existing public highway. Table 1.3 provides a list of these activities, relevant receptor, distance from the activity and predicted unmitigated noise impact. At these locations the specified construction activity will only be undertaken within the Restricted Working Hours (i.e. Monday to Friday 07.00 to 19.00). If this is not possible then these works would be subject to the Section 61 consents application process as outlined in Section 1.6.


Final 10 July 2016

Table 1.3 Construction activities/ locations subject to Restricted Working Hours

Construction Activity

Route Section

Receptor Distance

(m)

Predicted Unmitigated Noise Impact LAeq,T (dB)*

Removal of pylon PX2

A 151 Broad Oak Road 30 71.9


A Ulcombe Gardens 10 81.5


A 22 to 24 Halstead 10 81.5


A 18 to 22 Bicknor Close 22 74.6


A 10 Bluebell Woods 30 70.3

Construction of bellmouth BM06

A 6 Shalloak Road 21 75.9








A 1, 1A Popes Lane 25 74.4


A 1, 1A Popes Lane 34 71.7

*Predicted noise levels are worst case predictions assuming all plant running simultaneously, no mitigation and has assumed free field for sound propagation between noise source and receptor location

1.6 SECTION 61 CONSENT APPLICATIONS

Introduction

1.6.1 Contractors will be required to submit applications for Section 61 consents, variations and dispensations under CoPA for construction activities that are:

indicated to exceed the noise limits (as defined in Table 1.1 in Section 1.3) at sensitive receptors; or

to be undertaken outside of the Core Working Hours (within the parameters of the DCO Requirements as set out in Section 1.4.5) and where relevant Restricted Working Hours (as set out in Section 1.4.6).


Final 11 July 2016

1.6.2 The contractor will be required to demonstrate that BPM, as defined under Section 72 of the CoPA, are employed at all times for all activities, to minimise noise and vibration effects on sensitive receptors.

1.6.3 On appointment, the contractor will be required to review the construction noise predictions as set out in the Environmental Statement (Doc 5.2, Chapter 11 (January 2016) and consider the construction plant and methods as presented in the ES. The contractor will engage with the relevant LPA to identify construction activities that may require Section 61, as set out in Section 1.6.6 to Section 1.6.9 below.

1.6.4 Where a Section 61 consent is to be sought, before starting any construction activities which may cause significant noise (see Table 1.1) and/or vibration, the contractor will engage with the local relevant LPA six weeks prior to submission of the S61 to present a draft S61 application to agree on the format for the submission.

1.6.5 The contractor will then be required to, or as agreed with the local authority, prepare and submit to the relevant local authority information which will include:

a. an outline of the proposed construction method, type and number of plant to be

used;

b. definition of the working hours required and, where these differ from the Core

Working Hours detailed in Schedule 3, Requirement 7 of the draft DCO, a

justification for the working hours sought;

c. a work programme which identifies the location and duration of each significant

noise-generating activity;

d. the sound power levels, or sound pressure level at 10m, for each item of plant

for each relevant activity;

e. appropriate (in terms of noise/vibration level, duration and working hours)

justification that the method and plant proposed demonstrates that BPM has

been employed to control noise and vibration impacts;

f. predicted noise and vibration levels at specified sensitive recpetor locations

supported by calculations as per the methodology in BS 5228 part 1 and part 2;

and

g. all steps to be employed to minimise noise and vibration during the works.

1.6.6 The number, extent (geographically and in terms of construction activities) and duration of Section 61 approvals will be the subject of timely consultation between the contractor and each relevant planning authority.

1.6.7 The contractor will engage in early discussions with the relevant planning authorities with respect to the information to be provided prior to submitting any Section 61 applications. This will include a list of the activities/stages for which separate Section 61 applications will be required. This is to enable all parties to focus on and agree those activities that could give rise to noise complaint and the most efficient approach to the Section 61 consent, dispensation or variation.

1.6.8 Where works are near local authority boundaries, the Section 61 submission will be made to the planning authority within which the construction activities are located, with a noise assessment made at locations representative of all neighbouring noise-sensitive receptors.

1.6.9 Neighbouring local authorities will be consulted in advance of the works to determine the need for any additional measures.


Final 12 July 2016

1.6.10 Where the works are to be undertaken on the boundary within two local authorities, an application will be made to each authority. The authorities are requested, through discussion, to agree a common set of consent conditions to be issued from each local authority.

1.6.11 Typical generic noise and vibration suppression measures to be employed are included in section 1.5 of this NVMP and will be adopted on site where applicable. Agreement of proposed measures will be sought from the relevant planning authority through Section 61 consent, dispensation or variation applications.

1.6.12 Notification of the start of works and the provision of advanced information to local stakeholders is a key part of mitigating the effect of noise and vibration.

1.6.13 The contractor will be responsible for any appeals under the DCO in relation to Sections 60 and 61 of the CoPA.

Dispensation/Variation

1.6.14 In the event that works (for which a Section 61 consent has been applied for) have to be rescheduled or modified (e.g. method or working hours) for reasons not envisaged at the time of the Section 61 consent submission, the contractor will apply for a dispensation or variation from the relevant planning authority in advance of the start of those works and at the time specified within the CoPA. The dispensation will be sought by means of an application for a variation to the agreed matters, setting out the revised construction programme or method and the relevant noise calculations.

1.6.15 Where the rescheduling relates to work of a more urgent or critical nature (such as a key activity likely to delay other key activities), the contractor will apply to the relevant planning authority using the Section 61 process, where practicable. This change application will be issued seven days (but at least two working days) before the start of those works.

1.6.16 Where working outside of Core Working Hours has been accepted in a Section 61 consent (including dispensation or a variation), occupiers of nearby residential or other sensitive properties who are likely to be affected will be informed, as soon as reasonably practicable, by the contractor and the likely duration of planned works.

1.6.17 The contractor will be required to maintain an up to date log of all relevant agreed hours and controls on working. This will incorporate any changes to working hours or practices set out in the NVMP which have been agreed through the Section 61 process.

Unscheduled Overruns

1.6.18 In the event that planned works not covered by a consent (either full Section 61 application or dispensation/variation) extend beyond the approved working hours and continue due to unforeseen circumstances that would affect safety or engineering practicability, the relevant planning authority will be kept informed of the nature, time, location and reasons for the overrun as soon as possible, and records kept by the site management.

1.6.19 The relevant planning authority will be requested to provide a designated e-mail address to receive such notifications. The contractor will be required to notify the LPA in writing by e-mail to a designated e-mail address provided by the LPA explaining


Final 13 July 2016

the reason for the unscheduled overruns, the expected duration of the overruns and specific measures to be put in place to minimise the associated noise impacts.

1.6.20 Overruns and the reasons for these will be reviewed by National Grid, its contractors and the relevant planning authority, with the aim of reducing the potential for further unplanned overruns.

1.6.21 In the case of work required in response to an emergency (or which, if not completed, would be damaging or unsafe), the relevant planning authority will be advised as soon as is reasonably practicable of the reasons for, and likely duration of, such works.

1.7 PUBLIC NOTIFICATIONS AND COMMUNICATIONS

1.7.1 The contractor will implement a system for the provision of information to local residents and occupiers about the works and for the handling of complaints as described in Section 2.10 of Doc 5.4.3C(A) (the CEMP), a community relations agency will be appointed to provide dedicated community relations and external communication support. The information to be provided to local residents must be specific to the works to be carried out, describing the nature of the works, the location and extent of the works, the duration of works and the hours to be worked.

1.7.2 Amongst other duties, the community relations team will be responsible for managing the interface between the project and the communities in which the works are being undertaken. In respect of the NVMP the following procedures will be implemented:

Local residents will be informed of the commencement and likely duration of the construction work activities through a letter drop. The letter will be tailored to a specific area and reflects the works to be carried out and the duration of works rather than a standard letter for all works and all locations. The letter will be issued to the respective LPA before issue to the public. The letter will include a contact telephone number which will be manned at all times that construction activities are being undertaken on site;

If construction activities are likely to generate noise levels in excess of the construction noise limits outlined in Section 1.3 and where s61 consents have been sought, the relevant planning authority and local residents will be informed of the works at least 48 hours prior to works commencing;

Where a person from a community local to the works makes a complaint with respect to construction noise and/or vibration, it will be passed initially to the community relations team. The community relations team will liaise with the other members of the project team to investigate the complaint and communicate this to the complainnant;

Appropriate action will be taken by the project construction team. Actions could include site specific noise montioring (see Paragraph 1.10.6), implementing additional noise control measures such as those listed in Section 1.5, halting the activity causing the complaint until a full investigation has been carried out, changing the method of working or plant being used, or providing mitigation in the form of screening; and


Final 14 July 2016

Records of complaints will be available to the EHO for the respective LPAs. Regular liaison meetings will be held with the LPAs and contact will be facilitated through a contact person appointed by the contractor.

1.8 NOISE INSULATION AND TEMPORARY RE-HOUSING

1.8.1 The contractor will implement BPM to ensure the noise limits in Table 1-1 are met. Chapter 11 Noise and Vibration of the ES (Doc 5.2) indicates that noise insulation will not be required. The NVMP acknowledges that Noise Insulation Regulations 1975 as amended 1988 and BS5228 provide for noise insulation and/ or temporary housing where, despite implementing BPM, the trigger levels in Table 1.4 and temporal criteria in paragraph 1.8.8 are breeched.

1.8.2 Annex E of BS5228-1+A1 provides criteria for the assessment of significance of construction noise. Exceedances of threshold levels trigger a responsibility on the developer to provide noise insulation or a scheme to facilitate temporary rehousing. This represents additional protection for a residential property in the event that it is not practical to mitigate construction noise on site, or reduce its exposure durations to tolerable levels.

1.8.3 The standard suggests that noise insulation should be provided if the trigger levels shown in Table 1.4 are predicted to be exceeded for a period of ten or more days of working in any 15 consecutive days, or for a total number of days exceeding 40 in any six month period.

1.8.4 This process will be undertaken as part of the Section 61 consent process.

1.8.5 Where noise levels at affected residential properties are expected to exceed the trigger levels for the periods defined below (Table 1.4) and where the temporal criteria is met, approved noise insulation, (or reimbursement of the reasonable costs thereof), or temporary re-housing of occupants as appropriate, will be offered. Affected parties will be notified in advance of the commencement of works which may cause the relevant trigger levels to be exceeded.

1.8.6 Noise insulation or temporary re-housing will be offered to qualifying parties when noise levels are predicted, or measured, to exceed:

a. the relevant trigger levels as detailed in Table 1.4; or, b. where the current ambient noise level is greater than the noise insulation trigger

level:

the ambient noise level shall be used as the noise insulation trigger level.

the ambient noise level +10dB shall be used as the temporary re-housing trigger level.


Final 15 July 2016

Table 1.4 Construction noise triggers for noise insulation and temporary re-housing

Day Relevant time

period

Averaging time

T

Noise insulation

trigger level, dB

LAeq,T

Temporary re-

housing trigger

level, dB LAeq,T1

Monday

to Friday

0700-0800 1 hour 70 80

0800-1800 10 hour 75 85

1800-1900 1 hour 70 80

1900-2200 3 hour 65 75

2200-0700 1 hour 55 65

Saturday

0700-0800 1 hour 70 80

0800-1300 5 hour 75 85

1300-1400 1 hour 70 80

1400-2200 3 hour 65 75

2200-0700 1 hour 55 65

Sunday and Bank Holidays

0700-2100 1 hour 65 75

2100-0700 1 hour 55 65

Note 1) Equivalent continuous A-weighted noise level predicted or measured at a point

1m in front of the most exposed windows or doors leading directly to a habitable room

(living room or bedroom) in an eligible dwelling.

1.8.7 Noise insulation (or the reasonable costs thereof against agreed bills) will be offered to owners, where applied for by owners or legal occupiers, if all of the following apply to a property lawfully occupied as a permanent dwelling:

a. The predicted noise level exceeds the noise trigger level for noise insulation at the property during at least ten days out of any period of fifteen consecutive days or alternatively during 40 days in any six month period;

b. Noise insulation does not already exist that is of an equivalent standard to that which would be allowed for under the Noise Insulation (Railways and Other Guided Transport Systems) Regulations 1996; and

c. The property complies with all other requirements of the Noise Insulation (Railways and Other Guided Transport Systems) Regulations 1996.

1.8.8 Temporary re-housing (or the reasonable costs thereof) will be provided, where applied for by legal occupiers, if both of the following apply to a permanent dwelling:


Final 16 July 2016

a. The predicted noise level exceeds the noise trigger level for temporary re-housing at that property for at least ten days out of any period of 15 consecutive days or alternatively 40 days in any six month period; and

b. The property complies with all other requirements of the Noise Insulation (Railways and Other Guided Transport Systems) Regulations 1996.

1.8.9 The noise insulation and temporary re-housing policy is primarily applicable to residential buildings; however non-residential buildings will be considered on a case by case basis where these are occupied by noise sensitive uses such as hospitals and educational establishments.

1.9 VIBRATION ACTION LEVELS

1.9.1 Whilst the vibration levels are not expected to be significant, the construction activities with the greatest potential to result in perceived vibration effects at nearby residential properties will relate to piling works (pylon construction). Nuisance impacts of piling will be limited by carrying it out during Restricted Working Hours where possible, and through public liaison and communications.

1.9.2 The construction vibration action level provided in Table 1.5 below relates to typical site construction activities, and is based upon guidance provided in BS 5228- 2:2009+A1:2014.

Table 1.5 Vibration action levels

Vibration level Effect

1.0 mm.s−1 It is likely that vibration of this level in residential environments will cause complaint, but can be tolerated if prior warning and explanation has been given to residents.

10 mm.s−1 Vibration is likely to be intolerable for any more than a very brief exposure to this level.

15 mm.s-1 Onset of possible cosmetic damage to residential or light commercial buildings.

1.9.3 Section 1.7 of the plan sets out the procedures for public notifications and communications. Where complaints are made relating to vibration, monitoring will be carried out to establish whether vibration levels exceed the criteria in Table 1.5. Where vibration levels exceed the action level of 10 mm.s-1 appropriate mitigation measures will be implemented.

1.10 NOISE AND VIBRATION MONITORING

1.10.1 In order to ensure and demonstrate compliance of the construction activities at the site to the appropriate limits presented in Table 1.1 it will be necessary to undertake a scheme of compliance monitoring.


Final 17 July 2016

1.10.2 Given the transient nature of the construction and dismantling works, random monthly noise surveys will be carried out to demonstrate compliance with the appropriate noise limits.

1.10.3 The noise surveys will consider the construction programme and identify when noisier works are scheduled to be carried out close to noise sensitive receptor locations.

1.10.4 In addition to the random monitoring, a long term noise monitoring system with live Leq will be set up at the Westbere Compound. The compound presents a long-term source of construction noise and there are residential properties located in close proximity.

1.10.5 The need for additional long-term noise and vibration monitoring will be the subject of discussion between the contractor, National Grid and the relevant planning authority prior to submission of any Section 61 application.

1.10.6 In the event that complaints regarding noise and/or vibration are received, measurements will be undertaken either at the complainant's property or at a suitable known reference distance from the works so that any additional attenuation factors can be determined in accordance with the procedures in BS 5228 part 1 and part 2; measurements if required will also be undertaken in accordance with these and other appropriate standards.

1.10.7 Bi-weekly reports will be produced to analyse data from the long-term noise monitoring location(s) and for any random monitoring carried out. In addition to the reports the LPAs will be provided with login details to view the live Leq data in real-time.

1.10.8 The contractor will be responsible for appointing a suitably qualified person(s) (see Section 1.11) to carry out the noise monitoring, maintain and run the live Leq system and prepare the bi-weekly reports. All surveys and noise measurements will be undertaken in accordance with BS7445.

1.11 SUITABLY QUALIFIED PERSONS AND TRAINING

1.11.1 The person(s) responsible for the development of Section 61 applications and variations, and for the associated noise and vibration calculations and/or monitoring, will demonstrate:

a. a summary of training and education relevant to the management of construction noise and vibration;

b. experience of the Section 61 process and of monitoring noise and vibration (if required);

c. confirmation that the individual is, at minimum, an associate member of the institute of acoustics; and

d. registration with the Institute of Acoustics (IOA).

1.11.2 All appropriate National Grid staff and their contractor's personnel will be instructed on BPM measures to reduce noise and vibration as part of their induction training, and followed up by site 'tool box' talks.

1.11.3 All site personnel will receive training appropriate to the nature of their roles and responsibility. The training will include specific information in relation to noise and vibration management. If their work activities are assessed as being particularly noise/vibration emission prone all staff will receive induction training that will


Final 18 July 2016

incorporate environmental awareness training, plus specific training in relation to noise and vibration.

1.12 AUDIT AND REPORTING

National Grid will undertake regular monitoring and audits of its contractor’s activities and performance in compliance with this Plan. Any non-compliance will be deemed unacceptable and the relevant work suspended until measures to resolve the non-compliance are authorised by the responsible National Grid representative.


Final 19 July 2016

APPENDIX 1

Receptor locations within 100m of construction works

Work Description Work Ref. No. Route Section Receptor Distance (m)

New kV400 Pylons

Proposed Pylon PC3 A 4 Shalloak Road 93

6 Shalloak Road 93

Proposed Pylon PC5 A 3 Shalloak Road 85

Proposed Pylon PC11 A

Proposed Caravan Site 1 69

Bellmouth Construction

Bellmouth BM03 A Greenbridge Park 44

Bellmouth BM08 A 4 Shalloak Road 37

Bellmouth BM09 A 3 Shalloak Road 25

14 Shalloak Road 39

Bellmouth BM10 A 9A Shalloak Road 48

20 Shalloak Road 24

22 Shalloak Road 42


20 Shalloak Road 36

22 Shalloak Road 25


20 Shalloak Road 23

22 Shalloak Road 35

Bellmouth BM16 A 1, 1A Popes Lane 25


3 Sweechgate 75


A 3 Sweechgate 95

Bellmouth BM21 A The Focsle 75

Kemberland 97


Final 20 July 2016


Culvert Construction

Culvert PC2-CR01 A Greenbridge Park 60

Culvert PC2-CR02 A Greenbridge Park 93

Culvert PC21-CR01 B Chislet Business Park 33

Culvert PX35-CR01 B Fairfields 63

Site Compounds

Site compound - Westebere SC-W A Wildwood 40

Sunbeam 35

Bluebells 40

Eureka 20

Scaffolding (Construction)

Scaffolding (construction) S1.1.1 A Greenbridge Park 86




Scaffolding (construction) S3.1.1 A 4 Shalloak Road 87

6 Shalloak Road 87

Scaffolding (construction) S3.1.2 A 4 Shalloak Road 65

6 Shalloak Road 65

Scaffolding (construction) S4.1.1 A

Broadoak Lodge Farm 64

Scaffolding (construction) S4.1.2 A

Broadoak Lodge Farm 64

Scaffolding (construction) S16.1.1 A Tile Lodge farm 86

Pylon Removal

Pylon removal PX002 A 151 Broadoak Road 30


Final 21 July 2016


Pylon removal PX003 A Ulcombe Gardens 10

Pylon removal PX004 A 22 to 24 Halstead 10

13 Halstead 12

Pylon removal PX005 A 18 to 22 Bicknor Close 22

Pylon removal PX009 A 9A Shalloak Road 56

9 Shalloak Road 86

5 Shalloak Road 88

3 Shalloak Road 95

Pylon removal PX010 A 10 Bluebell Woods 30

6 Bluebell Woods 36

30 Shalloak Road 81

34 Shalloak Road 87

Pylon removal PX013 A 7 to 15 Popes Lane 45

Popes Lane 75

Pylon removal PX019 A Hoades Court 88

Scaffolding (Demolition)

Scaffolding (demolition) SD7A.1.1 A 1 Shalloak Road 167

6 Shalloak Road 177

Scaffolding (demolition) SD7A.1.2 A 1 Shalloak Road 167

6 Shalloak Road 177

Scaffolding (demolition) SD9.1.1 A 9A Shalloak Road 56

9 Shalloak Road 86

5 Shalloak Road 88

3 Shalloak Road 95

Scaffolding (demolition) SD9.1.2 A 9A Shalloak Road 56

9 Shalloak Road 86

5 Shalloak Road 88


Final 22 July 2016


3 Shalloak Road 95

Scaffolding (demolition) SD10.1.1 A 10 Bluebell Woods 30

6 Bluebell Woods 36

30 Shalloak Road 81

34 Shalloak Road 87

Scaffolding (demolition) SD10.1.2 A 10 Bluebell Woods 30

6 Bluebell Woods 36

30 Shalloak Road 81

34 Shalloak Road 87

Scaffolding (demolition) SD13.1.1 A 7 to 15 Popes Lane 45

Popes Lane 75

Scaffolding (demolition) SD13.1.2 A 7 to 15 Popes Lane 45

Popes Lane 75

Scaffolding (demolition) SD19.1.1 A Hoades Court 88

Scaffolding (demolition) SD19.1.2 A Hoades Court 88

Pylon Diversion

Pylon diversion (PX) PX08TB3 A 3 Shalloak Road 98

Pylon diversion (PX) PX08TB3 A 3 Shalloak Road 98

Access Tracks

Access Track BM01 A 151 Broadoak 10

Access Track BM03 to PC1 A Greenbridge Park 44

Access Track BM05 to PC2-CR02 A Greenbridge Park 76

Access Track BM06 to PX5 A 6 Shalloak Road 21

18 to 22 Bicknor Close 22


Final 23 July 2016


Access Track BM08 to PC4 A 4 Shalloak Road 37

Access Track BM09 to PC5 A 3 Shalloak Road 18

16 Shalloak Road 39

Access Track BM10 A 9A Shalloak Road 48

20 Shalloak Road 24

22 Shalloak Road 42

Access Track BM11 to PX9 A 9A Shalloak Road 6

20 Shalloak Road 36

22 Shalloak Road 25

Access Track BM12 A 20 Shalloak Road 17

22 Shalloak Road 22

Access Track BM13 to PC7 A 1 Mayton Lane 42

Access Track BM14 to PC9 A Vale Cottages 47

Access Track BM15 to PC19 A Vale Cottages 46

Access Track BM16 to PX12 A 1, 1A Popes Lane 25

Access Track BM17 A 1, 1A Popes Lane 66

3 Sweechgate 75

Access Track BM18 to PX13 A 1, 1A Popes Lane 34

3 Sweechgate 95

Access Track BM19 to PC11 A Proposed Caravan

Site 1 69

Access Track BM21 to PC10-CR01 A The Focsle 75

Kemberland 97

Access Track BM22 to PX19 A Hoades Court 88

Tile Lodge Cottages 61

Access Track BM24 to PC17-CR01 B

Tile Lodge Farm House 79


Final 24 July 2016



Final 25 July 2016

APPENDIX 2

Indicative Worst Case Construction Noise Predictions

1. Baseline Noise Surveys and Methodology

During engagement with the Environmental Health Officers (EHOs) of Canterbury City Council

(CCC), Dover District Council (DDC), Thanet District Council (TDC) and Kent County Council (KCC),

baseline monitoring locations and duration of monitoring was agreed. The baseline surveys have

been carried out and the data has been reported in the Environmental Statement (Volume 5

Document 5.2 Chapter 11 (January 2016).

Baseline surveys were carried out on a typical weekday (on 18 and 19 November 2014), as agreed

with the respective LPAs, and the data is shown below:

Table 1 Baseline Noise Data for Construction Noise Assessment

Location Description

Noise Level (dB A)!

LAeq(T) LAmax LAmin

Section A

1 Bricknor Close 47.7 76 38.5

2 Static caravans off Vauxhall

Lane 59.4* 96.2 21.5

3 Property off Shalloak Road

opposite Lynne Wood 58.7* 96.2 21.5

4 Bluebell Wood Park 62.5* 85.6 42.4

5 6 Mayton Lane, Broad Oak 51.7 75.1 40.5

6 Behind Popes Lane 55.9 89.7 34.8

Section B

7 Tile Lodge Farm 53.3 75.3 44

8 Houses adjacent to Nethergong

Camping site. 57.5 81.2 41.1

9 Wall End Farm 69.5 88.4 34.9

Section C

10 Old Road (South East of Sarre) 50.2 87.9 33.4

11 Gore Street 55.5* 84.4 36.3

Section D

12 Sheriffs Court 57.1* 88.5 38.8

13 Richborough Farm 48.8 72.6 29.9

*Noise levels have been adjusted for distance from measurement location to receptor location


Final 26 July 2016


Noise Level (dB A)!

LAeq(T) LAmax LAmin

! LAeq,T is the equivalent sound pressure level - the steady sound level that, over a specified period

of time, would produce the same energy equivalence as the fluctuating sound level actually

occurring.

LAmax is the maximum A-weighted sound pressure level occurring within a specified time period.

LAmin is the minimum A-weighted sound pressure level occurring within a specified time period.

BS 5228-1: 2009 +A1 2014 Annex E recommends the ABC method to establish construction noise

limits for environmental impact assessments. The ABC method involves rounding the existing

ambient noise levels to the nearest 5dB( A) for the appropriate time period (night, evening/weekends

or day) and then comparing these levels to the total noise level, including construction noise. If the

total noise level exceeds the existing rounded value, then a significant effect is deemed to have

occurred.

This can be seen more clearly in Table 2.

Table 2 Threshold of significant effect at dwellings from construction

Assessment Category and Threshold Value

Period

Threshold Value, in decibels (dB) LAeq,T

Category A Category B Category C

Night-time (23:00 – 07:00) 45 50 55

Evenings and weekends 55 60 65

Daytime (07:00 – 19:00) and Saturdays (07:00 –

13:00)

65 70 75

NOTE 1 A potential significant effect is indicated if the LAeq, T noise level arising from the site exceeds

the threshold level for the category appropriate to the ambient noise level.

NOTE 2 If the ambient noise level exceeds the Category C threshold values given in the table (i.e. the

ambient noise level is higher than the above values), then a potential significant effect is indicated if the

total LAeq, T noise level for the period increases by more than 3 dB due to site noise.

NOTE 3 Applied to residential receptors only.

The categories set out above are applied as follows:

Category A is the threshold values to use when ambient noise levels (when rounded

to the nearest 5 dB) are less than these values;

Category B is the threshold values to use when ambient noise levels (when rounded

to the nearest 5 dB) are the same as Category A values;

Category C is the threshold values to use when ambient noise levels (when

rounded to the nearest 5 dB) are higher than Category A values.

If the existing ambient noise levels are higher than the threshold values presented in Table 2 then a

significant effect is deemed to have occurred if the total LAeq noise level for the period increases by


Final 27 July 2016

more than 3 dB due to construction activity. The ABC method should only apply to residential

receptors.

When considering the baseline data in Table 1 against the criteria in Table 2, it is indicated that for all

locations, the criteria in Category A would be appropriate for the assessment.

Table 3 Threshold of Significant Effect for Richborough Construction Works


Noise Level (dB A)

LAeq(T)* Appropriate Category

Section A

1 Bricknor Close 50 Category A

2 Static caravans off Vauxhall

Lane 60 Category A

3 Property off Shalloak Road

opposite Lynne Wood 60 Category A

4 Bluebell Wood Park 65 Category A

5 6 Mayton Lane, Broadoak 50 Category A

6 Behind Popes Lane 55 Category A

Section B

7 Tile Lodge Farm 55 Category A

8 Houses adjacent to Nethergong

Camping site. 60 Category A

9 Wall End Farm 70 Category A

Section C

10 Old Road (South East of Sarre) 50 Category A

11 Gore Street 55 Category A

Section D

12 Sheriffs Court 55 Category A

13 Richborough Farm 50 Category A

Construction works will be confined to daytime hours on a weekday and a weekend.

There may however be a need to carry out night-time works, for example when daytime works on

roads and rail are not possible due to traffic disruption and safety issues. The night-time works would

relate to erecting scaffolding at road and rail crossings and erecting netting on scaffolding.

The intended construction hours are as follows:

0700 and 1900 Mondays to Fridays

0800 and 1700 on Saturdays and Sundays (the Core Working Hours)


Final 28 July 2016

Based on the criteria in Table 2 and the criteria in Annex E of BS5228, the following thresholds in

Table 4 have been set for considering construction noise effects.

Table 4 Threshold limit and construction noise limits

Relevant time period Noise significance

threshold dB LAeq,T 1

Noise limit dB LAeq,T 2 Noise insulation

trigger level, dB LAeq,T

Daytime (Weekday

0700-1900 and

Saturday 0800-1300)

65 70 75

Weekends (Saturday

1300-1900 and Sunday

0700-1900)

55 60 65

Night-time 45 50 55

1. From BS5228 Annex E and Table 2 above

2. Based on BS5228 Annex E

3. From BS5228 Annex E

2. Construction Noise Predictions

Predicted daytime noise levels have been calculated using the methods set out in BS5228-1. The

predictions have followed a cautious approach in that the worst-case assumption has been applied.

In calculating the noise levels it has been assumed that the ground would be hard, and no attenuation

has been included. The predicted noise levels have been presented as façade noise levels and in

accordance with BS5228 a +3dB correction has been applied to obtain the façade noise level.

2.1 Construction of the 400kV overhead line

The potential for exceedances of the proposed noise limits would be confined to locations where

works take place in close proximity to receptor locations. In particular the Canterbury end of the

proposed 400kV overhead line route presents the greatest likelihood of exceedance of the weekday

and weekend noise limits given the proximity of the construction works to receptor locations and the

built up nature of the area.

The area around Canterbury where noise limits are likely to be exceeded is indicated on the following

Figures.


Final 29 July 2016

Figure 1 Greenbridge Park

Figure 2 No. 4 and 6 Shalloak Road

Cumulative construction noise impacts in the above area are considered in Section 3.


Final 30 July 2016

2.2 Dismantling of the 132kV Overhead Line Dismantling of the 132kV overhead line will take place once the 400kV overhead line has been constructed. Dismantling of the 132 kV overhead lines will take place in close proximity to residential properties on Ullcombe Gardens, Halstead Road and Bricknor Close. There is a very small separation distance between the existing pylons and residential properties. Unmitigated noise levels are predicted to exceed the daytime limit of 70dB(A) and the weekend limit of 65 dB(A) at the closest locations as indicated in Table A2 and on Figure 3 below.

The pylons to be dismantled are indicated on Figure 3 as PX002 to PX005A. PX001 will be retained

but the conductor wires will be removed.

Figure 3 Noise sensitive locations at 132 kV Pylon Locations

3. Cumulative Construction Noise Impacts

Construction of the 400kV overhead line is linear and the works are transient in nature. The works are also phased, following a sequence at each pylon location that would follow the following general activities:

Construct the bellmouth

Construct the access route


Final 31 July 2016

Prepare the pylon site

Piling works for the pylon

Pylon assembly

Install conductors

Access route and bellmouth removal

4. Separation Distances

The separation distance between pylon locations are generally large, usually in excess of 300m and

cumulative impacts are unlikely. At the gantries the separation distances are slightly shorter. The

separation distances between pylon locations are shown below.

Table 5 Separation distance between pylon locations

Pylon Distance (m)

PC01 PC02 175

PC02 PC03 405

PC03 PC04 391

PC04 PC05 311

PC05 PC06 419

PC06 PC07 366

PC07 PC08 390

PC08 PC09 405

PC09 PC10 305

PC10 PC11 395

PC11 PC12 368

PC12 PC13 355

PC13 PC14 354

PC14 PC15 342

PC15 PC16 307

PC16 PC17 379

PC17 PC18 300

PC18 PC19 437

PC19 PC20 269

PC20 PC21 442

PC21 PC22 353

PC22 PC23 439

PC23 PC24 356

PC24 PC25 371

PC25 PC26 308

PC26 PC27 423

PC27 PC28 332

PC28 PC29 302


Final 32 July 2016

PC29 PC30 406

PC30 PC31 302

PC31 PC32 340

PC32 PC33 310

PC33 PC34 328

PC34 PC35 295

PC35 PC36 341

PC36 PC37 373

PC37 PC38 362

PC38 PC39 321

PC39 PC40 368

PC40 PC41 316

PC41 PC42 426

PC42 PC43 311

PC43 PC44 273

PC44 PC45 374

PC45 PC46 357

PC46 PC47 349

PC47 PC48 361

PC48 PC49 363

PC49 PC50 360

PC50 PC51 327

PC51 PC52 361

PC52 PC53 352

PC53 PC54 343

PC54 PC55 351

PC55 PC56 309

PC56 PC57 346

PC57 PC58 205

PC58 PC59 199

PC59 PC60 151

There are also generally large separation distances between construction locations and receptor

locations. At the Canterbury end of the route there are locations where construction works would

take place closer to residential receptors given the built up nature of the area.

5. Phasing of Works

The construction of the proposed 400kV PC overhead line will be completed before the dismantling of the 132kV PX overhead line, so there will not be any cumulative noise impacts between these phases of the Project. Cumulative noise impacts would therefore depend on:

Works at various locations being carried out simultaneously


Final 33 July 2016

The separation distance between construction locations

The separation distance between construction locations and receptor locations

Cumulative construction noise impacts will therefore be geographically localised. The proximity of receptors to construction works along the entire overhead line corridor has been reviewed and cumulative noise impacts have been considered at the following location: Bellmouth 2, Bellmouth 3, Bellmouth 4 and Bellmouth 5

Cumulative construction noise impacts are considered from the works at Bellmouth 2, Bellmouth 3, Bellmouth 4 and Bellmouth 5 as shown on Figure 4. This includes the construction of the bellmouths, construction of the access routes and construction of pylons PC1, PC2, PC3 and PC4. Figure 4 Cumulative construction noise locations and receptors for BM2, BM3, BM4 and BM5

The construction works will be completed in stages as indicated previously, with bellmouth construction being followed with construction of the access route and then construction of the pylon. Works on the respective bellmouths could be carried out simultaneously. The cumulative construction noise predictions below assume free-field propagation between the various construction activities and do not consider intermediate buildings and other structures. The cumulative predictions also consider noise sources that are more than 300m from receptor locations. BS5228 warns that predictions over distances greater than 300m need to be viewed with caution as they do not adequately consider noise attenuation from ground and atmospheric absorption. Bellmouth Construction The cumulative construction noise impacts at receptor locations for pylons, PC2, PC3 and PC4 have been presented along with the predicted noise impacts for the individual construction activities in Table 6.


Final 34 July 2016

Table 6 Predicted Noise Impacts from Pylon Construction

Receptor Earthworks Bellmouth

Construction Road

Surfacing

81 Vauxhall Ave 52.1 55.7 54.4

64 Vauxhall Ave 52.8 56.3 55.0

Greenbridge Park 66.8 70.3 69.1

4 Shalloak Road 59.8 63.4 62.1


8 Broadoak Lodge Farm 52.8 56.4 55.1

10 Broadoak Lodge Farm 52.6 56.2 54.9

32 Kemsing Gardens 46.3 49.8 48.5


In Table 6 it is indicated that at Greenbridge Park the daytime limit of 70 dB(A) is marginally exceeded by 0.3 dB. The weekend noise limit of 60 dB(A) is exceeded at a number of locations. The highest predicted noise levels are presented in Table 7 along with mitigation options. Table 7 Mitigation during bellmouth construction to meet noise limits

Receptor Bellmouth

Construction Required sound reduction to meet 60dB weekend noise limit

Mitigation Options

81 Vauxhall Ave 55.7 0

64 Vauxhall Ave 56.3 0

Greenbridge Park 70.3 10.3 Acoustic screens 5 to 10dB

More efficient exhaust system 5 to

10dB

Super-silenced plant and equipment

5dB or more

4 Shalloak Road 63.4 3.4 Acoustic screens 5 to 10dB


10dB


5dB or more

6 Shalloak Road 63.5 3.5 Acoustic screens 5 to 10dB


10dB


5dB or more

8 Broadoak Lodge Farm 56.4 0

10 Broadoak Lodge Farm 56.2 0

32 Kemsing Gardens 49.8 0

1 Shalloak Road 63.3 0

Table 7 indicates that a variety of mitigation options can be implemented to ensure that the daytime noise limit of 70dB and weekend noise limit of 60dB are met.


Final 35 July 2016

Pylon Construction The cumulative construction noise impacts at receptor locations for pylons PC1, PC2, PC3 and PC4 have been presented Table 8. Table 8 Predicted Noise Impacts from Pylon Construction

Ground Preparation

Piled Foundations

Pylon Assembly

Conductor Installation

81 Vauxhall Ave 55.4 62.3 45.7 56.7

64 Vauxhall Ave 55.7 62.7 46.1 57.0

Greenbridge Park 61.1 68.1 51.5 62.5

4 Shalloak Road 62.5 69.5 52.8 63.8

6 Shalloak Road 62.8 69.7 53.1 64.1

8 Broadoak Lodge Farm 57.6 64.5 47.9 58.9

10 Broadoak Lodge Farm 57.7 64.7 48.1 59.0

32 Kemsing Gardens 49.2 56.2 39.6 50.6

1 Shalloak Road 60.7 67.7 51.0 62.0

Table 8 indicates that during construction of the 400kV pylons, the daytime noise limit of 70dB(A) is not exceeded and the weekend limit of 60dB(A) is exceeded. The highest predicted noise levels are presented in Table 9 along with mitigation options. Table 9 Required mitigation for construction of 400kV Pylons

Receptor Piled Foundations

Required sound

reduction to

meet 60dB

weekend noise

limit

Mitigation Options

81 Vauxhall Ave 62.3 2.3 Enclose hammer head and top of pile in

acoustic screen 5 to 10 dB

Use resilient pad between pile and hammer

head 5 to 10 dB

Power units/ base machines – acoustically

dampen panels and covers 5 to 10 dB

Select quieter plant or less intrusive piling

method

Acoustic screens/ barriers 5 to 10 dB

64 Vauxhall Ave 62.7 2.7 Enclose hammer head and top of pile in



head 5 to 10 dB




method



Final 36 July 2016


Required sound

reduction to

meet 60dB

weekend noise

limit

Mitigation Options

Greenbridge Park 68.1 8.1 Enclose hammer head and top of pile in



head 5 to 10 dB




method


4 Shalloak Road 69.5 9.5 Enclose hammer head and top of pile in



head 5 to 10 dB




method





head 5 to 10 dB




method


8 Broadoak Lodge Farm 64.5 4.5 Enclose hammer head and top of pile in



head 5 to 10 dB




method


10 Broadoak Lodge Farm 64.7 4.7 Enclose hammer head and top of pile in



head 5 to 10 dB




Final 37 July 2016


Required sound

reduction to

meet 60dB

weekend noise

limit

Mitigation Options


method


32 Kemsing Gardens 56.2 0




head 5 to 10 dB




method


Table 9 indicates that a variety of mitigation options can be implemented to ensure that the daytime noise limit of 70dB and weekend noise limit of 60dB are met.

Contact us

Visit our project website: www.richboroughconnection.co.uk

Send an email to: [email protected]

Write to our freepost address at: FREEPOST RICHBCONNECTION

Call our freephone number: 0800 157 7878

Follow us on Twitter: @NGRichborough

noise and vibration management plan - planning … · noise and vibration management plan ... 1.10...

Documents