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«LONDONWEST MIDLANDS ENVIRONMENTAL STATEMENT Volume 2 | Community Forum Area report CFA7 | Colne Valley November 2013 ES 3.2.1.7 VOL LondonWest Midlands ...»

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 working hours (draft CoCP, Section 5.2);

 the management of construction traffic (draft CoCP, Section 14); and  the handling of construction materials (draft CoCP, Section 3.3).

Advance works 2.3.7 General information about advance works can be found in Volume 1, Section 6.4.

Advance works will be required before commencing construction works and will

typically include:

 further detailed site investigations and surveys for proposed construction compounds;

 further detailed environmental surveys;

 advance mitigation works including, where appropriate, contamination remediation, temporary habitat creation and translocation and built heritage survey and investigation;

 site establishment with temporary fence construction; and  utility diversions, including the diversion of the National Grid overhead power lines in the Colne Valley, as shown on Map CT-05-019 (Volume 2, CFA7 Map Book). This will involve the establishment of a local construction compound managed by National Grid.

CFA Report – Colne Valley/No 7 | Overview of the area and description of the Proposed Scheme Engineering works 2.3.8 Construction of the railway will require engineering works along the entire length of the route and within land adjacent to the route. This will comprise of two broad types

of engineering work:

 civil engineering works such as earthworks and erection of bridges and viaducts; and/or  railway installation works such as laying ballast or slabs and tracks and/or installing power supply and communications features.

2.3.9 The construction of the scheme will be subdivided into sections, each of which will be managed from compounds. The compounds will act as the main interface between the construction work sites and the public highway, as well as performing other functions as described below. Compounds will either be main compounds or satellite compounds, which are generally smaller. Some compounds will be used for civil engineering works and others for railway installation works and in some cases for both.

2.3.10 In the Colne Valley area there are two main compounds and seven civil engineering satellite compounds and two railway installation satellite compounds (both of which will continue to use compounds previously established for the civil engineering works).

2.3.11 Figure 2 shows the management relationship for civil engineering works compounds and Figure 3 for the railway installation works compounds. Details about individual compounds are provided in subsequent sections of this report.

General overview of construction compounds 2.3.12 Main compounds will be used for core project management staff (i.e. engineering, planning and construction delivery), commercial and administrative staff. These management teams will directly manage some works and/or coordinate satellite

compounds which will manage other works. In general, main compounds will contain:

 space for the storage of bulk materials (aggregates, structural steel and steel reinforcement);

 space for the receipt, storage and loading/unloading of excavated material either onto or off the site;

 an area for the fabrication of temporary works equipment and finished goods;

 fuel storage;

 plant and equipment storage; and  necessary operational parking.

2.3.13 Satellite construction compounds will be used as the base to manage specific works along a section of the route. They will usually provide office accommodation for limited numbers of staff, local storage for plant and materials, limited car parking for staff and site operatives and welfare facilities.

CFA Report – Colne Valley/No 7 | Overview of the area and description of the Proposed Scheme 2.3.14 Some compounds will also accommodate additional functions as listed below. Where

this is the case they will be included in the description of the compound:

 railheads will connect with the existing railway network for the delivery of materials for the construction of the rail systems, further details are provided in Section 2.3.34;

 construction sidings will connect with the existing railway network to enable loading and unloading to and from trains delivering material to the HS2 site or removing excavated material, further details are provided in the relevant area reports;

 roadheads will require an area of land adjacent to the compound for the storage and loading and unloading of bulk earthworks materials which are moved to and from the site on public highways;

 living accommodation for the construction workforce;

 In addition, areas adjacent to some compounds will be used for the storage of topsoil stripped as part of the works prior to it being used when the land is reinstated; and  Further information on the function of compounds, including general provisions for their operation including security fencing, lighting, utilities supply, site drainage, codes of worker behaviour are set out in Volume 1, Section 6 and the draft CoCP, Section 5).

Construction traffic routes 2.3.15 The movement of construction vehicles carrying materials, plant, other equipment and workforce (or moving empty) will take place both within the construction sites, on public roads and via the rail network. The construction compounds will provide the interface between the construction works and the public highway or rail network and the likely road routes to access compounds are described in subsequent sections below.





2.3.16 Movements between the construction compounds and the worksites will be on designated haul roads within the site, often along the line of the Proposed Scheme or running parallel to it.

Figure 4: Schematic of site compounds for civil engineering works

–  –  –

West Ruislip railhead main compound 2.3.17 This compound is located within CFA6 but it will provide support to all rail installation works satellite compounds for the construction of the Proposed Scheme throughout this area. The West Ruislip railhead main compound is incorporated within the Northolt tunnel and earthworks main compound (see CFA6 report).

2.3.18 The railway systems installation works will include track, overhead power line, communications equipment and traction power supply. The installation of track in the twin bore tunnels will be slab track. The installation of track in open areas will be of standard ballast or slab track configuration.

2.3.19 Works in this area will take approximately one year, commencing in 2022.

2.3.20 The track will be laid in a northerly direction away from the West Ruislip railhead main compound in this area. Prior to the railway systems installation commencing, adequate civil engineering work will need to be completed to allow a continuous track laying sequence.

2.3.21 The railway systems installation will have its own mobile welfare facilities for the site staff.

Colne Valley viaduct construction 2.3.22 Construction of the Colne Valley viaduct and approach embankments will be

managed from the following satellite compounds, described in further detail below:

 Colne Valley viaduct main compound;

 Colne Valley viaduct and south embankment satellite compound;

 Colne Valley viaduct satellite compound;

 Colne Valley viaduct storage satellite compound;

 Colne Valley viaduct jetty storage satellite compound;

 Colne Valley viaduct laydown satellite compound;

 Colne Valley viaduct north launch satellite compound; and  Colne Valley viaduct north embankment satellite compounds.

2.3.23 The viaduct and approach embankments will take approximately four years to construct. Volume 1, Section 5.9 describes a typical viaduct. The construction of the Colne Valley viaduct will differ from a typical viaduct in that it will be constructed in three sections. The eastern section, from the southern end as far as the Grand Union Canal, will be constructed using the launched construction method (see Volume 1, Section 6.16). The mid-section will be constructed using the in-situ construction method. The western section could be constructed by either the in-situ construction method (see Volume 1, Section 6.16) or by a combination of the launched and in-situ construction methods. The impacts of these methods have been considered to be broadly similar for the purposes of this assessment.

CFA Report – Colne Valley/No 7 | Overview of the area and description of the Proposed Scheme 2.3.24 The sections of the viaduct to be constructed above water will require a temporary jetty to provide construction access and a working platform which will be installed along the northern side of the viaduct. Along these sections temporary cofferdams will be installed around the perimeter of the pile caps to provide a dry working area to enable installation of the piles and pile caps.

2.3.25 To construct the viaduct it will be necessary to install piled foundations within Source Protection Zone 1 (SPZ1) therefore a piling method will be chosen to mitigate contamination of ground water.

Colne Valley viaduct main compound 2.3.26 This compound (see Map CT-05-022, Volume 2, CFA7 Map Book) will be used for civil engineering works only, between Harvil Road, the east of Denham Green and south of

Maple Cross. The compound will:

 be operational for approximately five years and three months, commencing in 2017;

 support approximately 75 workers each day throughout much of the civil engineering works period but will increase to a maximum of 200 workers each day during the peak period of activity;

 provide overnight accommodation for between approximately 55 to 90 people for an estimated period of four years and three months;

 be accessed via the M25, the A412 Denham Way/North Orbital Road and Chalfont Lane (light goods vehicles only) or alternatively via Chalfont Lane and the temporary M25 slip roads from the east and the M40, A40, A412 and Chalfont Lane from the west; and  provide main compound support to seven satellite compounds, as illustrated in Figure 2.

2.3.27 Works in this section of the Proposed Scheme will be carried out in the following

broad phases:

 site clearance and enabling works;

 building demolition;

 culverts and drainage;

 cuttings, embankments and landscaping earthworks;

 construction of bridges, retaining walls and viaducts;

 highway and footpath construction and reinstatement; and  permanent fencing.

2.3.28 In addition to the Colne Valley viaduct, this compound will also be used to construct Tilehouse Lane cutting, West Hyde embankment and the Chiltern tunnel south cutting which will take approximately three years and nine months, four years and three months to construct respectively. Volume 1, Section 5.2 describes typical CFA Report – Colne Valley/No 7 | Overview of the area and description of the Proposed Scheme cuttings and embankments and Section 6.8 describes the associated construction activities.

2.3.29 Demolitions will be required at the following locations.

Table 1: Colne Valley viaduct main compound demolitions

–  –  –

CFA Report – Colne Valley/No 7 | Overview of the area and description of the Proposed Scheme 2.3.32 Diversion of six utilities and the installation of six new utilities will be required, the key

ones being:

 protection of National Grid high pressure gas mains across A412 Denham Way/North Orbital Road;

 removal of 8 inch National Grid high pressure gas main and capped by the side of A412 Denham Way/North Orbital Road;

 protection of Affinity Water Northmoor pumping station off the A412 Denham Way/North Orbital Road (adjacent to River Colne);

 temporary realignment of the 132kV SSE overhead power line along the eastern site of the M25, with permanent realignment below ground along the existing alignment;

 permanent new 33kV supply, connecting electricity to the Proposed Scheme at West Hyde auto-transformer station; and  permanent new SSE supply connecting electricity power to Chiltern tunnel south portal building.

2.3.33 Temporary diversion of the private access to Denham Park Farm quarry site will be required during different phases of the construction of the Proposed Scheme.

2.3.34 No watercourse realignments will be required.

Colne Valley viaduct and south embankment satellite compound/Ickenham auto-transformer feeder station satellite compound 2.3.35 This compound (see Map CT-05-019, Volume 2, CFA7 Map Book) will be used for civil engineering and railway installation works and will be located west of Harvil Road. The compound will extend into CFA6. Following the civil engineering works, the compound will become Ickenham auto-transformer feeder station satellite compound

for the railway installation phase of works. The compound will:

 be in place for six years and six months. During this period there will be civil engineering works for approximately three years, commencing in 2018, followed by a one year period of inactivity before the railway installation works that will last for approximately two years and six months, commence in 2022;

 support approximately 40 workers each day throughout much of the civil engineering works period but will increase to a maximum of approximately 55 workers each day during the peak period of activity and support approximately 35 workers each day throughout much of the railway installation works period but will increase to a maximum of approximately 60 workers each day during the peak period of activity;

 not provide overnight worker accommodation;

 be accessed via the A40, B467 Swakeleys Road and Harvil Road and/or via the M40, A40, A412 Denham Way/North Orbital Road, Moorhall Road and Harvil Road from the west;

CFA Report – Colne Valley/No 7 | Overview of the area and description of the Proposed Scheme  be managed from the Colne Valley viaduct main compound for the civil engineering works and the West Ruislip railhead main compound in CFA6 for the railway systems installations works; and  have a roadhead for the receipt, storage and transfer of earthworks material route wide (see Map CT-05-019, Volume 2 CFA7 Map Book).

2.3.36 Works in this section of the Proposed Scheme will be carried out in the following

broad phases:

 site clearance and enabling works;

 embankments and landscaping earthworks;

 construction of viaducts; and  permanent fencing.

2.3.37 The key railway systems installation works in this section of the Proposed Scheme will be the installation of Ickenham auto-transformer feeder station. Volume 1 Section

5.17 describes a typical power supply and Section 6.23 describes the associated construction activities.

–  –  –

CFA Report – Colne Valley/No 7 | Overview of the area and description of the Proposed Scheme 2.3.40 Demolitions will be required at the following locations.

Table 2: Colne Valley viaduct satellite compound demolitions

–  –  –

CFA Report – Colne Valley/No 7 | Overview of the area and description of the Proposed Scheme  a permanent diversion of the Newyears Green Bourne which will require a realignment of approximately 140m to the west around the Colne Valley viaduct piers; and  a permanent diversion of the River Colne which will require a realignment of approximately 170m to the south around the Colne Valley viaduct pier.

Colne Valley viaduct storage satellite compound 2.3.45 This compound (see Map CT-05-020, Volume 2, CFA7 Map Book) will be used for civil engineering works only, between south of South Harefield and the north of Denham

Green. The compound will:

 be operational for approximately three years and nine months, commencing in 2017;

 support approximately 40 workers each day throughout much of the civil engineering works period;

 not provide overnight worker accommodation;

 be accessed via the M40, A40, A412 Denham Way/North Orbital Road and Moorhall Road; and  be managed from the Colne Valley viaduct main compound.

2.3.46 Works in this section of the Proposed Scheme will be carried out in the following



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