Pennant Walters (PYWX) Limited · Construction Method Statement 1 Introduction 1.1 WYG has been appointed by Pennant Walters Limited to prepare a Construction Method Statement (CMS)

www.wyg.com creative minds safe hands 5th Floor, Longcross Court, 47 Newport Road, Cardiff, CF24 0AD

PyWEx2 - Pant y Wal Wind Farm Construction Method Statement

Pennant Walters (PYWX) Limited

PyWEx2 - Pant y Wal Wind Farm

Construction Method Statement

A107578

November 2019

www.wyg.com creative minds safe hands 5th Floor, Longcross Court, 47 Newport Road, Cardiff, CF24 0AD Prepared for Pennant Walters (PYWX) Limited


Document Information

Prepared for Pennant Walters (PYWX) Limited

Project Name PyWEx2 - Pant y Wal Wind Farm

File Reference A107578 Construction Method Statement 18.03.2019

Project Number A107578

Publication Date November 2019

Contact Information

WYG Environment Planning Transport Ltd

47 Newport Road

Cardiff

United Kingdom

CF24 0AD

+44 (0)29 2082 9200

[email protected]

www.wyg.com

Registered in England & Wales Number 3050297

Registered office: Arndale Court, Headingley, Leeds, LS6 2UJ

Document Control

Version Date Prepared by Reviewed by Approved by Approver Signature

D1 18.03.2019 Andrew Hughes Nigel Atkinson Nigel Atkinson

Description

D2 21.11.2019 CE AH MA

Description

Description

Description

Description

Description

Limitations

© WYG. Copyright in the whole and every part of this document belongs to WYG and may not be used, sold, transferred, copied or reproduced in whole or in part in any manner or form or in or on any media to any person other than by agreement with WYG. This document is produced by WYG solely for the benefit and use by the client in accordance with the terms of the engagement. WYG does not and shall not assume any responsibility or liability whatsoever to any third party arising out of any use or reliance by any third party on the content of this document.



Contents 1 Introduction 3

2 Construction Methodology 4

Draft Construction Methodology 4

Working Hours 4

Site Compounds and Security 4

Boundary Fencing 5

Public Rights of Ways (PROW), Bridleways and Byways 5

Ecology 6

Archaeology 6

Earthworks 7

Access Track Construction 7

Excavation and Construction of Turbine Bases 8

Cable Laying 9

Illumination of Compounds and Work Areas 9

3 Ground and Surface Water Management 10

Site Hydrology 10

Construction Phase Water Management Methodology 11

Maintenance of Pollution Prevention Measures 12

Monitoring 12

Emergency Procedures 13

Vehicle Cleaning Prior to Exiting onto Highway (A4093) 14

Vehicle Cleaning with the Site 14

Management and Storage of fuel, oil, concrete and chemicals 15

Site Restoration Phase 16



1 Introduction

1.1 WYG has been appointed by Pennant Walters Limited to prepare a Construction Method Statement

(CMS) to a accompany a planning application for two 125m high (to blade tip) wind turbines at land

to the south of the Pant y Wal extension in Cwmogwr Forest, on the eastern side of the Ogmore Valley.

1.2 The document provides information detailing how the Contractor intends to carry out the works whilst

minimising any adverse impacts and providing particular reference to pollution and surface water

management.

1.3 The application site boundary is shown in Appendix A for reference.

1.4 It is important to note from the outset that under planning permission P/14/293/FUL for the extension

of Pant Y Wal wind farm, 12 turbines were applied for, but two turbines were removed from the

application (for non-transport related reasons). Twelve turbines were therefore assessed with regards

to transport impact, however 10 turbines were permitted; only 8 of which were built and are

operational. The turbines proposed as part of the current application are proposed to be developed

in lieu of 2no. turbines permitted (pp ref P/14/293/FUL) which have not been implemented (turbines

G & H).



2 Construction Methodology

Draft Construction Methodology

2.1 The proposed development consists of 2 wind turbines, access tracks and associated development.

2.2 As per the previously approved scheme, the construction process is anticipated to be broadly similar

to the construction of the wind farm extension in 2015, albeit for two turbines only, and consist of the

following operations:

• Construct temporary storage compound and temporary site offices;

• Construct the access tracks to each turbine, off the main access track;

• Excavate for turbine foundations;

• Construct the turbine foundations, to include hard standings for future maintenance and de-

commissioning;

• Install underground power and instrumentation cables. Trenching will follow tracks wherever

practicable;

• Erect two turbines; and

• Carry out land reinstatement, remove temporary accommodation, and reinstate temporary

compound area.

2.3 An illustrative construction programme is provided below in Diagram 2.1 below: To be confirmed.

Working Hours 2.4 Normal site operations will be as follows:

• Monday to Friday - 7:00am to 19:00pm

• Saturday - 7:00am to 13:00pm

• Sunday/Bank Holidays - No working

2.5 Wind farm construction works (civil and turbine installation) are very weather susceptible. The above

hours will be monitored and adapted as necessary to meet the project programme. In particular during

the turbine erection period (approximately 4 weeks duration) the hours will be extended, to benefit

from low wind periods and may be longer.

Site Compounds and Security

2.6 The Contractor will be responsible for general site security and will provide reasonable provision to

protect against theft of plant and materials as well vandalism during and outside of normal working

hours. The Contractor will make suitable and reasonable provisions to guard against access by

unauthorised personnel to site.



2.7 The site compound is anticipated to be provided near to the existing wind farm substation. Given

that this is the construction of turbines at an existing wind farm, it is anticipated contractors will be

familiar with the site.

2.8 Within 12 months of the first commercial generation, land occupied by the Contractors’ compounds

and storage areas would be cleared and restored. Prior to restoration soil samples would be taken for

laboratory tests to confirm no contamination of the site had occurred during construction, in

accordance with the previous schemes, that also undertook this.

2.9 Top soil, set aside at the start of construction, would be replaced uniformly across the compound and

the edges married into surrounding soil levels. The site would be seeded with an appropriate seed

mix (to be specified by the Landscape Architect and/or Ecologist) to integrate the former compound

area into the surrounding fields, in accordance with the previous approval.

Boundary Fencing 2.10 The Contractor will install Heras type fence around all working areas where significant hazards are

present. In particular fencing will be provided at the two turbine locations and around all excavations.

Haulage routes will naturally be marked by bunding and fenced if necessary, subject to risk

assessment. Construction areas will be clearly signed within the site.

2.11 All construction areas, including the turbine bases and crane pads, compounds, storage areas and

service trenches will be suitably fenced to prevent unauthorised access. The Contractor will display

signs notifying people that they must not enter the construction areas.

2.12 Site boundaries with interfaces with farmland, which are currently fenced, will be maintained by the

Contractor for the full duration of the contract. Any informal footpaths will be duly diverted around

the construction area and signed accordingly.

Public Rights of Ways (PROW), Bridleways and Byways

2.13 The Contractor is responsible for maintaining public rights of way (footpaths and bridleways) for the

duration of the contract. The Contractor will survey all public rights of way prior to the works and

identify potential points of entry to the site area. All points of entry will be suitably signed warning

the public of the dangers associated with the works. All public rights of way (PROW) crossing the site

will be protected at all times and any damages caused to the rights of way will be repaired to the

original condition.

2.14 It is proposed to provide access to Turbine 1 from a small section (c.230m) of the PRoW to its

immediate north (Footpath 7 Ogmore Vlley). In consultation with BCBC’s Rights of Way Section it is

proposed to upgrade the surface of this section of the footpath to facilitate the development. A

temporary closure will allow the necessary upgrade (as per existing wind farm access tracks).



2.15 Turbine 2 has been carefully sited to ensure it does not over-sail the definitive route of Footpath 7. It

is intended that works will be carried out on the ground to make the definitive route legible. A

temporary closure is anticipated whilst these works are carried out.

2.16 Where any public crossing meets the construction works then the Contractor will provide signage

and/or screening and/or marshals and gates to ensure the safe passage. Where footpaths cross the

access track kissing gates will be installed as specified by the local authority.

2.17 The Contractor is responsible for arranging for the temporary closure of footpaths etc with appropriate

diversions for the duration of the works. All diversions will be agreed with the Local Authority and

suitably fenced.

2.18 No barbed wire will be used within 5m of any PROW.

Ecology

2.19 Prior to progressing onto any new area of works a pre-construction inspection will be carried out by a

qualified ecologist. Items typically to be considered by the ecologist would be:

• Status of any hedgerows than need to be translocated (none anticipated);

• Inspection of disused badger sett (none anticipated);

• Inspection for any nesting birds;

• Inspection for any protected species such as great crested newts (none anticipated);

• Check any stream crossings for wildlife such as otters or water voles;

• Check streams and crossings for any issues relating to control of run-off;

• Check on track and turbine locations in relation to peat and advise on micro-siting; and,

• Check whether there are any bat, reptile, and amphibian issues that have developed and need

consideration.

2.20 All findings, actions and recommendations will be recorded in a summary report and maintained for

inspection and future reference.

Archaeology

2.21 If required by the local planning authority, a Written Scheme of Investigation (WSI) will be prepared

in advance of the works in accordance with a scope to be agreed with Glamorgan Gwent Archaeological

Trust (GGAT). The WSI will include provision for a watching brief to facilitate the rapid investigation

and recording of archaeological features, in the event that any are uncovered during the proposed

ground works.

2.22 If any archaeological sites of any significance are found, they will be fenced and protected during the

works.



2.23 If required by the local planning authority, an archaeologist will be on site at all times when topsoil

ground is first broken (top soil strip) to conduct a watching brief. In the event of significant

archaeological features being discovered all activities in the area of the site would be temporarily

suspended. This will allow a period of consultation with GGAT and, if required, the opinion of

specialists. All other finds would be investigated, recorded and archived in accordance with the agreed

WSI.

Earthworks

2.24 The extent of topsoil strip in advance of earthworks will be kept to a minimum thus minimising the

time and area where non-vegetated soil is exposed to surface water runoff. The topsoil will be used

for temporary bunds to help segregate ‘clean’ surface water and ‘contaminated’ water from the site

works.

2.25 All excavated earth will be held in temporary bunds and reused within the works local to the point of

excavation. Access tracks and turbine locations are designed to achieve a local cut and fill balance to

minimise haulage distances. On the basis that the main access tracks are already built, the level of

earthworks is anticipated to be minimal.

2.26 The exception to this will be in areas where hard rock is encountered. This will be set aside, processed

and used in the road construction to reduce stone imports. The areas used for temporary storage of

turbine blades will be re-profiled using surplus materials to blend with existing contours.

2.27 The turbine locations and already constructed access tracks have been designed to avoid areas of

deep peat. Notwithstanding this, if deep peat is encountered, it will be stored separately in bunds and

(if necessary) covered with plastic sheeting or sealed to maintain moisture. The peat will be deposited

within the existing peat areas as directed by the site Hydrologist and/or used to backfill any temporary

drainage ditches used for the construction of the works and/or used to top permanent drainage.

Access Track Construction

2.28 The main access tracks have been designed and built to avoid areas of peat and to align with the

natural site contours to minimise site earthworks operations and associated cut and fill batters. The

turbines will require track ‘spurs’ off the main access track, the length of additional track has bee

minimised owing to the proposed turbine locations, close to the existing access track network.

2.29 Tracks will generally comprise 300mm to 450mm stone on top of a geotextile. The design will be able

to accommodate all site traffic including turbine delivery vehicles, concrete vehicles and cranes. The

track width will be nominally 5.5m wide (structural running strip of 4.5m plus 0.5m edges). The track

may be widened at bends as necessary to facilitate the abnormal deliveries (towers, blades and

cranes).



2.30 In areas where the track construction is at grade and over poor-quality materials, the track will be

constructed directly off the existing ground surface hence effectively creating a floating road. This will

avoid degradation of the existing ground conditions and minimises the potential for surface water

contamination.

2.31 Regular lateral drainage and cross conduits for surface water control will be installed to ensure that

the existing site hydraulic conditions remain unchanged.

2.32 Areas where the track is in cut will be minimised. At these positions, surface water will be collected in

ditches running alongside the track and discharged at the earliest opportunity to mimic existing

hydraulic conditions. Existing hydrology will be maintained by ensuring that all existing drainage

catchments continue to discharge to the same outfall (e.g. watercourses or areas of peat bog).

2.33 Where haul roads and/or access tracks cross existing watercourses any temporary or permanent works

to any watercourse, including realignment, backfilling or culverting, will only be carried after obtaining

written consent from Natural Resources Wales (NRW). The Civil Engineering Contractor will proactively

consult with the NRW regarding land drainage issues and will secure all necessary consents for the

works however, considering that the main access tracks have already been constructed this is unlikely.

Excavation and Construction of Turbine Bases

2.34 All excavation will be undertaken using 360° tracked excavators. In areas of strong rock, the

excavators will be fitted with pneumatic breakers or bull dozers fitted with a rear ripper to aid rock

removal. No blasting or prolonged breaking (pneumatic breakers) will be necessary.

2.35 The excavated spoil (excluding topsoil and peat) resulting from excavations will be reused within the

works locally to the turbine location. The reduced formation will be brought back up to the required

foundation level (approximately 4m depth) with well compacted granular fill or concrete as directed

by the Geotechnical Engineer.

2.36 Topsoil will be stored locally ready for re-use as landscaping. It will be stored in stockpiles clear of all

fences, hedges and stone walls and to a height not exceeding 2m.

2.37 The turbine foundations are large reinforced concrete structures (approximately 17m in diameter

comprising 400m3 of concrete and 40T of reinforcement). These will be constructed using traditional

reinforced concrete techniques. Each foundation will require an extended concrete pour over a period

of approximately 12 hours. The foundation design will consider operational and extreme loads, ground

conditions (including pH), fatigue and the dynamic properties of the tower and will ensure that

differential settlements remain within the limits set by the turbine supplier for optimum performance

of the turbines.



Cable Laying

2.38 Cable routes will generally run alongside the access track and around the outside of crane platforms.

HV cables, telecommunications and earthing cables will all share the same single trench with the only

visible item being small concrete marker stones located at approximately 50m intervals and at road

crossings. Given that the existing track is already built, a lot of the cabling infrastructure is already in

place.

2.39 Where necessary, cables will be installed by ploughing. This technique installs cables directly into the

ground without the need for open trenching. Cables are ploughed into the ground and surrounded by

sand. This will take place at all locations accept where cutting into rock or at turbine locations where

traditional open trenching will be used.

2.40 Ploughing alleviates problems such as dealing with trench arisings, hazard of open trenches and

ground water problems.

2.41 Immediately prior to ploughing, routes will be inspected and small trial pits taken. Any areas of peat

will be noted. Where peat is present, the cables will be direct ploughed without sand surround. This

ensures that the cable does not form a conduit for ground water migration as may be encountered

with open trenching techniques.

Illumination of Compounds and Work Areas

2.42 The main construction works at the site will be illuminated by standard lighting sets powered by diesel

generators. Given the level of construction required for the two turbines proposed, this is considered

to be minimal compared to previous schemes.

2.43 Provision for lighting will be the responsibility of the Contractor, who will ensure that:

• Lighting will only be used during the specified working hours, with the exception of safety or

security emergencies;

• Lighting on the construction site will only be used where necessary and switched off when not

required unless specifically needed to comply with health and safety requirements;

• Lighting provision will be adaptable and carried out in accordance with good practice guidance

documents prepared by The Construction Industry Research and Information Association

(CIRIA);

• Temporary lighting fixtures will be installed and designed to provide full cut-off or will be

directionally shielded as required post-installation to ensure that artificial light is controlled and

substantially confined to the object(s) intended to be illuminated; and,

• The proposed location of lighting will take into consideration the location of sensitive receptors.

2.44 There will not be any permanent lighting on the turbines or on the site beyond the existing lighting

required for security purposes at the existing substation compound.



3 Ground and Surface Water Management

Site Hydrology

3.1 The Environment Agency website designates the solid geology beneath the site as a Secondary aquifer,

classified as being ‘permeable layers capable of supporting water supplies at a local rather than

strategic scale and in some cases forming an important source of base flow to rivers.

3.2 The main factors characterising the hydrological regime of the site are high rainfall, with generally

impermeable underlying geology and with waterlogged areas of modified bog. This combination of

factors gives rise to a relatively large volume of surface water run-off, which form the numerous small

watercourses visible within the site.

3.3 The following sections set out the practical measures that will be implemented as part of the

management of ground and surface water. However, a further assessment of the site will be carried

out prior to or during the early stages of construction as part of the detailed site geotechnical

investigation. The investigation will provide additional information and mitigation measures as

necessary. Ground Water Contamination

3.4 As with all construction projects, there is potential for the construction process to cause contamination

of the ground hence creating a hazard to site users, end users, neighbouring land or controlled waters.

There is also potential for existing contaminated soils to cause harm to human health and / or to

building materials.

3.5 A significant amount of technical information has already been undertaken at the Pant Y Wal extension

site and risks are known to a large extent, along with the most appropriate forms of mitigation.

3.6 A detailed site investigation has taken place during the early stages of the Pant Y Wal extension

construction project and prior to the construction of any foundations or any other excavation of

significant depth. Site investigation comprised:

• Trial pitting at each turbine location down to competent material, estimated to be 4 to 6m

deep;

• Boreholes at each turbine location to a minimum depth of 35m to establish/ confirm the

available rock cover to any worked seams;

• Geophysical survey (using sound waves to measure variation in density);

• Laboratory chemical tests for ph and sulphate;

• Laboratory analysis of stream waters; and,

• Laboratory analysis of coal mine spoil for heavy metals and pH.

3.7 A site contamination exposure model has been developed based on the findings of the site

investigation and any hazards / risks mitigated accordingly. This investigation will inform the



construction of the two turbines proposed., with potential contaminants and mitigation measures

known.

3.8 Prior to the commencement of the works the Contractor shall consult with Natural Resources Wales

(NRW) and discuss the use of various flexible methodologies for managing surface water. The

Contractor will maintain contact with NRW and encourage site visits to discuss performance and share

knowledge. This methodology has been used successfully at Maesgwyn, Pant y Wal and Fforch Nest

wind farms and has been implemented as part of the previous scheme.

Construction Phase Water Management Methodology

3.9 The Contractor shall develop a number of standard techniques for managing the surface water run-

off from the site. The principal objective is to constrain surface water runoff to within the construction

area and if necessary, treat all flows prior to discharging to an existing water course or to the ground.

Given that the proposal is only for two turbines, it is considered that the level of construction phase

water management will be minimal. However, the methods to be adopted shall include, but not be

limited to the following:

• Site walk-over during wet conditions to identify the presence of all water courses including

ephemeral streams. A buffer zone of at least 20m will be established between the edge of

watercourses and any proposed works. Where considered necessary by the Contractor,

exclusion fences will be erected to clearly mark the 20m buffer zone;

• Implement regime of isolating upstream clean surface water (ground water run-off or

watercourses) from the proposed working areas. This is achieved via bunds or cut-off trenches

with clean water temporarily diverted around the works or beneath the works via temporary

culverts. Upstream ‘clean’ water shall always be kept separate from ‘contaminated’ water

generated from within the working area;

• Minimise area of topsoil strip to that required for the immediate works only. Topsoil strip to be

used for bunding to protect the works;

• Implement regime of isolating contaminated water (contaminated by soil sediment within the

working zone) from any downstream watercourses. This is achieved by providing temporary

bunding and storage lagoons. Where space is restricted, or gradients too steep, then lagoons

shall be replaced with swales or trench excavations;

• Stored water shall be regularly pumped with the outflow treated with silt buster units, or

pumped over flat grassed land with no direct outfall to an existing watercourse;

• Silt fences or other filtration systems shall be introduced on all outfalls where there is a

potential surface route to any watercourse. Filtration systems include:

a. discharge over matured grassland (after checked than no direct links to

watercourses exist)



b. silt fences

• Temporary bunds to be shaped and covered/seeded to minimize contamination of run-off with

suspended solids;

• Track / spur construction shall generally be formed using ‘floating roads’ whereby the track is

raised above the adjacent areas; and,

• Permanent drainage ditches serving the access tracks will be formed with regular dams and silt

pits. Straw bales will be placed at regular intervals during the construction phase to retain any

sediments arising from the breakdown off aggregate during the construction process. Straw

bales will only be removed once the track surface reaches a condition whereby sediments are

no longer being created.

3.10 Wherever practicable any new areas of track will be drained entirely naturally by allowing runoff to

discharge directly to adjacent grassed areas. Where track side ditches are required then water will be

discharged over vegetated ground or into swales rather than discharge to a watercourse. Ditches shall

have regular sumps and dams to retain any remaining sediment arising from the stone surface.

3.11 The above measures will be developed by the Contractor ahead of the relevant section of the works

and documented within a site-specific surface water management plan. A separate plan shall be

provided for each turbine location and each section of access road as characterised by the surface

runoff characteristics. The plans and management proposals shall be continually adapted to

accommodate changes in site conditions and any unexpected issues. It is considered that most of this

information has already been prepared as part of the previous scheme.

3.12 Site staff will be fully briefed on the importance of ensuring discharges to watercourses are not

contaminated with suspended solids. Employees will be briefed on the potential environmental, legal

and commercial consequences of contamination as part of the site induction and supported by tool

box talks.

Maintenance of Pollution Prevention Measures

3.13 Maintenance will include, but not be limited to, repairs to silt fencing, clearing of silt traps and

soakaways, maintaining ditches, emptying storage lagoons, replacing straw bales and repositioning of

silt buster units around the site. These works shall be treated as an integral part of the on-going civil

works.

Monitoring

3.14 The site-based Project Manager is responsible for site operations and for monitoring water quality.

Monitoring may be delegated to the site foreman or engineer, but responsibility remains with the site

Project Manager.



3.15 Water management will be maintained during the construction period with the primary task of

inspecting and maintaining all water management and control measures. A rigorous inspection regime

shall be adopted by the Contractor such that all surface water protection measures are inspected on

a daily basis. Inspections would identify areas needing improvement and would identify any breaches

requiring immediate attention.

3.16 During site operations the water quality in the existing watercourses will be observed. Photographs

will be taken during wet and dry periods and maintained for record purposes.

3.17 The monitoring of existing watercourses will typically be carried out weekly but increased as deemed

necessary dependent on the site conditions. Monitoring will be recorded on a check sheet together

with a record of weather conditions. The observations are designed to allow the Project Manager to

gain an understanding of the existing site water system and to become aware of any implications of

the works on downstream water quality.

3.18 Given that this is the construction of two turbines on a wind farm site with well-established on site

practises the Project Manager is familiar with the site, characteristics and will be able to call upon

experience gained managing and monitoring the existing wind farm.

Emergency Procedures

3.19 The Contractor shall introduce emergency procedure to implement in case of pollution:

• Various pollution prevention products including Hytex Sedimat, Terrastop Premium (silt fence)

and straw bales will be stored on site, prior to construction, for use if found necessary.

• If at any time during operations it is suspected that the pollution prevention measures are not

sufficiently robust, then the works contributing to pollution shall stop and additional measures

set in place;

• If at any time during operation it is suspected that the works may be contributing towards

pollution of the existing ditch and/or watercourses, then emergency procedures will be

implemented immediately;

• All works contributing to the agitation of soils causing pollution will stop;

• Contaminated water within the ditch (or downstream watercourse) will be dealt with using the

most suitable method below, or combination thereof:

a. the ditch will be blocked off using granular materials, sandbags or bales and surplus

flows pumped over vegetated ground.

b. the ditch will be temporarily diverted over vegetated land

c. straw bales will be introduced within the watercourse at regular intervals to capture

and filter fine particles

• NRW will be notified of the incident



• Samples will be collected from the ditch and downstream settlement lagoon and stored for

future reference; and,

• A written record of the event will be held on file for inspection by NRW.

Vehicle Cleaning Prior to Exiting onto Highway (A4093)

3.20 All HGVs delivering to the site will travel solely on stone tracks resulting in little capacity to pickup of

mud. Earthmoving plant will generally not travel on the highway. While earthmoving equipment has

the potential to deposit small quantities of mud onto the access road that could be picked up by

delivery vehicles, it is likely that any mud picked up in this manner will be removed during transit along

the access road and certainly before reaching the highway.

3.21 Following site inspections, if it is judged that there remains a risk that mud could reach the public

highway then a full wheel wash will be provided at the site entrance adjacent to the A4093.

3.22 The wheel wash will be of a mechanical, automatically operated, self-contained type. To minimise the

environmental impact, the wheel wash will be a dry system type. The dry ramp wheel wash will be

located at the exit of the site and all HGV's (aggregate, concrete deliveries etc) will be instructed to

use it every time they leave the site.

3.23 Drivers will be expected to inspect their vehicle immediately prior to leaving the site and exiting onto

the A4093 thus ensuring that wheels are free from mud and there are no stones caught between their

wheels. This will be outlined in the delivery driver induction.

3.24 To ensure that the site access road and public highways remain safe and effective, they will be

regularly inspected by a competent staff member. Any discrete areas of mud or debris will be

immediately removed. Formal inspection records will be maintained on site for external inspection.

3.25 Considering that there has been two successful schemes at this site, providing over 20 turbines, there

is significant experience and knowledge gained regarding this and all appropriate measures will be

implemented.

Vehicle Cleaning with the Site

3.26 A contained standing area shall be provided for washing out and cleaning ready-mix concrete lorries.

Runoff shall be captured via a lined pit(s) or washout water discharged to a lined skip.

3.27 Wash waters from mobile pressure washers will not be discharged to surface water drains,

watercourses or soakaways. Even if described as bio-degradable, detergents will not be discharged

to surface drains. Mobile vehicle washing shall be carried out using a closed loop vehicle wash recycling

system. The contained water shall be discharged offsite to an authorised disposal facility.



Management and Storage of fuel, oil, concrete and chemicals

3.28 The temporary site compound will be located near to the wind farm extension (i.e. within the

application boundary) and not at the entrance on the A4093. The compound will include offices,

welfare, parking, material storage and plant storage. Fuel storage will be located within the plant

storage area and be positioned to allow safe access and maintenance.

3.29 The tank(s) will be positioned to minimise the risk of damage by impact. Diesel fuel will be stored in

an appropriately sized storage tank(s), designed specifically for the storage of fuel. The tank shall also

be surrounded by an oil tight bund, which shall have a storage volume of a minimum of 110% of the

capacity of the diesel tank under which it sits.

3.30 Leaks will be constantly monitored by trained operatives. All dispensers will comply with BS EN 13617.

3.31 To prevent theft and vandalism, lockable valves will be fitted on all storage tanks, fences will be secure,

and doors and gates kept locked.

3.32 The surface of the area where deliveries are made, and oil is dispensed shall be protected by a surface

impermeable to the oil stored and isolated from surface water drainage systems. This shall comprise

an impermeable polypropylene liner covered in 300mm graded stone with the liner upturned at the

circumference hence providing an impermeable catchpit. This will minimise the risk of spilt oils causing

pollution.

3.33 A road tanker will be used for re-filling the central diesel tank(s). Plant which will need to be refuelled

on site during the day will be refuelled by a self-contained diesel bowser, towed to the nearest on-site

refuelling point, with a suitable vehicle. The onsite refuelling points will be strategically located around

the site designated for mobile refuelling. They will be identified with appropriate signing and shall

comprise of a basic lined sand pit over which the item of plant in question shall be refuelled. They will

be located as far from watercourses as practicable and shall have a diesel spill kit at each location.

3.34 Small plant such as pumps or generators shall be refuelled using jerry cans. Refuelling will be carried

out over a drip tray. Jerry cans and other fuel containers shall be stored in a secured fuel container

within the compound.

3.35 As a general rule, at the end of the day all plant shall track back to the plant storage compound where

it will be refuelled. A spill kit shall also be held at this central location and at wind turbine locations

during civil engineering works.

3.36 On completion of the works sand pits and liners will be removed from site to an authorised disposal

facility. All fuelling area(s) shall be checked to ensure that fuelling procedures have not caused soil or

groundwater contamination. This may be verified by taking soil and groundwater samples. If

contamination is found, take action as soon as possible to remove the pollution.



3.37 An emergency spill plan will be prepared by the Contractor and adopted by all site users. All site

operatives shall be made aware of the spill plan via the site induction.

3.38 Management and storage of fuel and oil will be carried out in accordance with:

• PPG 7: The Safe Operation of Refuelling facilities;

• PPG 6: Working at Construction and Demolition Sites; and,

• PPG 8 Safe Storage and disposal of used oils.

Site Restoration Phase

3.39 All areas shall be restored and seeded as early as practicable within the construction programme.

Drainage channels, bunds and silt fences will, wherever possible, be removed following the

construction and run-off allowed to flow unimpeded across the ground.

Appendix A Site boundary

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Print

date:

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© WYG Environment Planning Transport Limited 2019. Registered in England Number: 3050297

North

A107578 Application Site 1.02.mxd

0 200 400 600100 Meters

Scale @ A3 - 1:20,000

PennantWaltersLimited

Pant-y-walExtension x2Application Site 1.02

KeyApplication Site

Proposed turbines

Pant-y-wal turbines

Pant-y-wal Extension turbines

!( Turbines permitted but not constructed

© Crown copyright and database rights 2019 Ordnance Survey 0100031673.

LA.

November 2019

Documents

Pennant Walters (PYWX) Limited · Construction Method Statement 1 Introduction 1.1 WYG has been appointed by Pennant Walters Limited to prepare a Construction Method Statement (CMS)