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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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broad phases:

 site clearance and enabling works;

 jetty construction (for construction access);

 construction of the viaduct; and  permanent fencing.

Colne Valley viaduct jetty storage satellite compound 2.3.47 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 two years and nine months, commencing in 2018;

 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 Colne Valley viaduct main compound.

CFA Report – Colne Valley/No 7 | Overview of the area and description of the Proposed Scheme 2.3.48 Works in this section of the Proposed Scheme will be carried out in the following

broad phases:

 site clearance and enabling works;

 jetty construction (for construction access);

 construction of the viaduct; and  permanent fencing.

Colne Valley viaduct laydown satellite compound 2.3.49 This compound (see Map CT05-021, Volume 2, CFA7 Map Book) will be used for civil engineering works only, between the north of Denham Green and south of Tilehouse

Lane. The compound will:

 be operational for approximately two years and three months, commencing in 2019;

 support approximately 15 workers each day throughout much of the civil engineering works period;

 not provide overnight worker accommodation;

 be accessed via A412 Denham Way/North Orbital Road northwards to the M25 junction 17 or via the A412, Chalfont Lane and the temporary M25 slip roads;

and  be managed from the Colne Valley viaduct main compound.

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

broad phases:

 site clearance and enabling works;

 construction of the viaduct; and  permanent fencing.

Colne Valley viaduct north launch satellite compound.

2.3.51 This compound (see Map CT-05-021, Volume 2, CFA7 Map Book) will be used for civil engineering works only, between the north of Denham Green and south of Tilehouse

Lane. The compound will:

 be operational for approximately two years and nine months, commencing in 2018;

 support approximately 35 workers each day throughout much of the civil engineering works period;

 not provide overnight worker accommodation;

CFA Report – Colne Valley/No 7 | Overview of the area and description of the Proposed Scheme

–  –  –

Colne Valley viaduct north embankment satellite compound 2.3.53 This compound (see Map CT-05-021, Volume 2, CFA7 Map Book) will be used for civil engineering works only, between the north of Denham Green and south of Tilehouse

Lane. The compound will:

 be operational for approximately four years, commencing in 2017;

 support approximately 40workers each day throughout much of the civil engineering works period but will increase to a maximum of approximately 195 workers each day during the peak period of activity;

 not provide worker accommodation;

 be accessed via the A412 Denham Way/North Orbital Road, A40 and the M40 to the west and/or Chalfont Lane from the M25 via the temporary M25 slip roads and A412 from the east; and  be managed from Colne Valley viaduct main compound.

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

broad phases:

 site clearance and enabling works;

 construction of embankments and landscape earthworks; and access roads;

and  permanent fencing.

Chiltern tunnel main compound/Chiltern tunnel south portal satellite compound 2.3.55 This compound (see Map CT-05-022, Volume 2, CFA7 Map Book) will be used for civil engineering works between Chalfont Lane and Juniper Wood in this area and construction of the Chiltern tunnel as far as Mantle’s Wood in CFA9. After the completion of the civil engineering works, the compound will reduce in size to form the Chiltern tunnel south portal satellite compound for the railway installation works.

The compound will:

CFA Report – Colne Valley/No 7 | Overview of the area and description of the Proposed Scheme  be in place for eight years. During this period there will be civil engineering works for approximately five years and nine months, commencing in 2017 and railway installation works that will last for approximately three years and nine months, commencing in 2021. There will be an overlap of one year and three months between the civil engineering and railway installation works;

 support approximately 255 workers each day throughout much of the civil engineering works period but will increase to a maximum of 310 workers each day during the peak period of activity. Throughout the rail systems installation works period it will support approximately 50 workers each day, increasing to a maximum of 120 workers each day during the peak period of activity;





 support 24 hour working during the Chiltern tunnel construction period;

 provide overnight living accommodation for approximately 95 to 140 people for an estimated period of five and a half years;

 be accessed via the A412 Denham Way/North Orbital Road, A40 and the M40 to the west and/or Chalfont Lane from the M25 via the temporary M25 slip roads and A412 from the east; and  be managed from the West Ruislip railhead main compound for the railway systems installation works.

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

broad phases:

 site clearance and enabling works;

 cutting and landscape earthworks;

 ground monitoring;

 pre-casting of concrete ring segments;

 tunnel portal construction;

 bored tunnel construction;

 installation of concrete ring segments;

 mining of cross passages;

 slab track;

 walkways;

 tunnel drainage;

 processing and removal of material from tunnel excavation;

 permanent fencing;

 rail systems installation; and  landscaping and planting.

CFA Report – Colne Valley/No 7 | Overview of the area and description of the Proposed Scheme 2.3.57 The compound will be used to manage construction of the Chiltern tunnel south portal and the Chiltern tunnel that will be approximately 13.5km long of which 200m is within this area. The complete Chiltern tunnel will take approximately five years and nine months to construct for the civil engineering works. Volume 1, Section 5.5 describes a typical tunnel and Section 6.12 describes the associated construction activities.

2.3.58 The compound will be used to manufacture the concrete ring segments for the tunnel linings.

2.3.59 No demolitions, PRoW, utility or watercourse diversions will be required.

2.3.60 For the duration of the construction programme, temporary slip roads onto the M25 will be provided to serve this compound. Chalfont Lane will be temporarily closed to through traffic but local access will be maintained to Sunnyhill Road. Through traffic will be temporarily diverted via a new local road which will be created to the west of the M25 and linked to Shire Lane and Hornhill Road.

2.3.61 Key railway systems installation works in this section of the Proposed Scheme will be:

 installation of West Hyde auto-transformer station that will take approximately one year and three months;

 fit out of Chiltern tunnel south portal buildings that will take approximately two years and nine months; and  fit out of tunnel and railway systems within Chiltern tunnel that will take approximately two years and nine months.

2.3.62 Volume 1 Section 5.17 describes a typical power supply and Section 6.23 describes the associated construction activities.

Construction waste and material resources 2.3.63 Forecasts of the amount of construction, demolition and excavation waste (CDEW) and worker accommodation site waste produced during the construction of the Proposed Scheme in the Colne Valley area have been prepared and are presented, Volume 5: Appendix WM-001-000.

2.3.64 The majority of excavated material generated across the Proposed Scheme will be reused as engineering fill material or in the environmental mitigation earthworks of the Proposed Scheme, either with or without treatment.

2.3.65 Based on the mitigation earthworks design approach adopted for the Proposed Scheme, local excess or shortfall of excavated material within the Colne Valley area will be managed with the aim of contributing to an overall balance of excavated material on a route-wide basis. This overall balance of excavated material is presented in Volume 3, Section 14.

2.3.66 Sustainable placement of inert surplus excavated material will be used where the material cannot be reused beneficially along or locally beyond the route and where it cannot be removed by either rail or along the construction corridor. One area of sustainable placement will be used within the Colne Valley area to permanently CFA Report – Colne Valley/No 7 | Overview of the area and description of the Proposed Scheme dispose of surplus excavated material generated in the South Ruislip to Ickenham area (CFA6) from the Proposed Scheme. This will avoid the introduction of a large volume of additional construction traffic to routes that are already likely to experience significant environmental effects during construction. The sustainable placement area of surplus excavated material is located south-east of South Harefield 2.3.67 This sustainable placement area will also improve an area of land that is currently unavailable for agriculture due to its past use as a landfill site; once the land is restored this will be returned to agricultural use and replanted with hedgerows to mirror their existing layout.

2.3.68 The quantity of surplus excavated material originating from the Colne Valley area that will require off-site disposal to landfill as excavation waste is shown in Table 3. This is the forecast quantity of contaminated excavated material that is chemically unsuitable for reuse within the Proposed Scheme.

2.3.69 The quantities of demolition, construction and worker accommodation site waste that will be reused, recycled and recovered (i.e. diverted from landfill) have been based on

the performance of similar projects as follows:

 demolition waste: 90%;

 construction waste: 90%; and  worker accommodation site waste: 50%.

2.3.70 The quantities of estimated construction, demolition and excavation wastes that will require off-site disposal to landfill are shown in Table 3.

Table 3: Estimated quantity of waste going to off-site disposal

–  –  –

2.3.71 The assessment of the likely significant environmental effects associated with the disposal of CDEW and worker accommodation waste has been undertaken for the Proposed Scheme as a whole (see Volume 3, Section 14).

–  –  –

CFA Report – Colne Valley/No 7 | Overview of the area and description of the Proposed Scheme Construction programme 2.3.73 A construction programme that illustrates indicative periods for each core construction activity in this area is provided in Figure 6.

Figure 6: Indicative construction programme

–  –  –

Advance works Advance works Civil engineering works Colne Valley viaduct and south embankment satellite compound Colne Valley south embankment Colne Valley viaduct satellite compound Colne Valley viaduct section 1 Colne Valley viaduct storage satellite compound Colne Valley viaduct section 2 Colne Valley viaduct north launch satellite compound Colne Valley viaduct section 3 Colne Valley viaduct north embankment satellite compound Colne Valley north embankment Heathrow spur west chord box structure Colne Valley viaduct main compound Tilehouse Lane cutting Tilehouse Lane overbridge Heathrow spur northbound retaining wall Heathrow spur southbound retaining wall Shire Lane culvert West Hyde embankment West Hyde auto-transformer station Chiltern tunnel south cutting Chiltern tunnel main compound Chiltern tunnel south portal Rail infrastructure and systems works West Ruislip railhead main compound See CFA 6 High speed railway installation Ickenham auto-transformer feeder station satellite compound Ickenham auto-transformer feeder station installation Chiltern tunnel south portal satellite compound Chiltern tunnel south portal buildings fit out Tunnel fit out and railway installation West Hyde auto-transformer station installation Commissioning Commissioning (until end 2026)

–  –  –

Maintenance 2.4.5 Volume 1, Section 4.3 describes the maintenance regime for HS2.

2.4.6 The intention is that inspections of the route will take place on a regular basis, at night when the railway is not operating. There will be routine preventative maintenance, including grinding and milling of the rails to keep them in good condition, and more periodic heavy maintenance as necessary.

2.4.7 Railway maintenance vehicles will be parked either at the Calvert infrastructure maintenance depot, or in the defined maintenance loops along the route.

Operational waste and material resources 2.4.8 Forecasts of the amount of operational waste that will be produced annually during operation of the Proposed Scheme have been prepared and are presented, Volume 5: Appendix WM-001-000.

2.4.9 Railway station and train waste refers to waste that will arise at each station. It will include waste from station operations and passenger waste removed from trains at terminating stations. This has only been reported for areas along the route in which these stations will be located.

2.4.10 Rolling stock maintenance waste is that which will be generated by the relevant train operating company at rolling stock maintenance facilities. This has only CFA Report – Colne Valley/No 7 | Overview of the area and description of the Proposed Scheme

–  –  –

2.4.14 The assessment of the likely significant environmental effects associated with the disposal of operational waste has been undertaken for the Proposed Scheme as a whole (see Volume 3, Section 14).

–  –  –

Denham Grove (De Vere Hotel) was formerly known as Durdent Court.

CFA Report – Colne Valley/No 7 | Overview of the area and description of the Proposed Scheme As part of these consultations, members of local communities and other interested parties were notified, provided with information and invited to engage on issues pertinent to the draft Environmental Statement and the development of the scheme. Details of the local consultation events were provided on HS2 Ltd website, social media, posters at local venues, national and regional advertising and to properties within 1km of the Proposed Scheme. In the Colne Valley area consultations on the draft Environmental Statement and on the Design Refinement were held on 21st June 2013 at the Denham Village Hall, Denham.

2.5.6 HS2 Ltd staff attended the events, including engineers and environmental specialists, for members of the public to speak to.

2.5.7 Responses from the draft Environmental Statement consultation have been analysed and an overview of those received and how the Environmental Statement has taken account of responses is contained in the Draft Environmental Statement Consultation Summary Report (Volume 5: Appendix CT-008-000).

Route section main alternatives 2.6 2.6.1 The main strategic alternatives to the Proposed Scheme are presented in Volume 1. The main local alternatives considered for the Proposed Scheme within the local area are set out within this section.



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