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    Introd

    uction

    Introd

    uction

    FalconbrookPumping Station

    Currently, untreated sewage regularly overows into the River Thames from Londons Victorian sewerage systemvia combined sewer overows (CSOs). The proposed Thames Tunnel would intercept these overows through theuse of a new storage and transfer tunnel, which would link west London and Abbey Mills Pumping Station. Thesewage ow would then be transferred to Beckton Sewage Treatment Works via the Lee Tunnel. The reductionin untreated sewage entering the River Thames would bring long-term benets for the environment and users of

    the River Thames. In order to deliver the project we need a number of sites along the route and this documentidenties our current preferred site at Falconbrook Pumping Station.

    Thames Tunnel

    Siteinformationpaper

    1

    Alternative to Bridges Court Car Park

    Key facts

    Local authority: Wandsworth

    CSO name: Falconbrook Pumping StationCSO spill volume in an average year: 710,000m (equivalent to approximately

    284 Olympic swimming pools)

    Site type: CSO site

    Duration of main construction works: Approximately three years.

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    Falconbrook Pumping Station

    2

    We are proposing to use our existing pumping station

    and adjacent disused toilet block for this constructionwork and to accommodate permanent structures required

    to operate the main tunnel. The site would be used to

    connect the existing local CSO, known as the Falconbrook

    Pumping Station CSO, to the main tunnel.

    The location of the site is shown in Figure 1A. York

    Gardens, a local park is adjacent to the site, beyond

    which, to the east, is the Winstanley Estate. York Gardens

    Library and Community Centre are to the south with YorkGardens Adventure Playground, which incorporates the

    One Oclock Club, to the north. To the west is York Road

    (A3205).

    Section 1: Introduction and site information

    Related documents:

    Build

    This site information paper sets out our proposals at

    Falconbrook Pumping Station. We have also producedproject information papers, which cover overarching

    topics relating to the project. Where we consider that a

    project information paper is particularly relevant, we have

    highlighted this in a related documents box. At the end

    of this site information paper is a list of other documents,

    which may be of interest and a glossary of terms.

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    Introduction

    3

    Figure 1A: Falconbrook Pumping Station location plan

    FalconbrookPumpingStation CSO

    FalconbrookPumping Station

    York Road CommunityCentre/Library

    Ploug

    hRoad

    Brid

    ges

    Court

    York

    Gardens

    Winstanley EstateLavenderRoad

    Newcome

    nR

    oad

    York GardensAdventure Playground

    N

    WANDSWORTH

    HAMMERSMITH &FULHAM

    York

    Roa

    d Local authority boundary

    Draft limit of land tobe acquired or used

    Proposed tunnelroute centreline

    Existing sewer

    Existing CSO

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    Falconbrook Pumping Station

    4

    How we chose this site

    What we proposed at phase one consultationAt phase one consultation, which was held between

    September 2010 and January 2011, Bridges Court Car

    Park was presented as our preferred site to intercept the

    Falconbrook Pumping Station CSO.

    Why we have amended our proposals

    Since January 2011, we have considered the comments

    from phase one consultation, feedback from ongoing

    engagement and new information; and undertaken

    further technical work. This has resulted in us re-assessing

    potential sites to intercept the Falconbrook Pumping

    Station CSO.

    We identified one potential new site, Falconbrook

    Pumping Station, which includes our existing pumping

    station and the adjacent disused toilet block off York

    Road (A3205). Prior to phase one consultation, the

    disused toilet block was identified as part of the site

    selection process but was considered to be too small on

    its own, so we did not progress this site any further.

    We also examined the pumping station site on its own

    and based on early design work and consideration of the

    technical issues identified; we were not able to confirm it

    was technically viable. This site was not progressed any

    further. Since January 2011, further technical work has

    concluded that the pumping station site combined with

    the disused toilet block is feasible, although it would still

    present technical challenges to intercept the CSO.

    Given the identification of this potential new site, in

    June 2011, we held drop-in sessions with the community

    around the site to understand any local issues they may

    have, should there be a site at this location. We reviewed

    all the comments we received and took these into

    account as part of the site selection process.

    What we are proposing at phase two consultationWe have identified five shortlisted sites to intercept the

    CSO, as shown in Figure 1B. The sites are:

    Foreshore near London Heliport, Lombard Road (site 1)

    Bridges Court Car Park (site 2)

    York Gardens, adjacent to York Road (site 3)

    York Gardens, adjacent to Pennethorne House (site 4)

    Falconbrook Pumping Station (our preferred site).

    Falconbrook Pumping Station is our preferred site tointercept Falconbrook Pumping Station CSO because it

    would cause less disruption to the wider local community

    in comparison to the other shortlisted sites and would

    potentially provide an improved public space after our

    works are complete. We also own most of the site unlike

    Bridges Court Car Park.

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    Introduction

    5

    Figure 1B: Preferred and shortlisted sites

    Site 1

    Site 2Site 3

    Site 4

    N

    YorkGardens

    YorkR

    oad

    WANDSWORTH

    Preferred site FalconbrookPumping Station

    Other shortlisted sitelocations

    Local authority boundary

    Brid

    ges

    Court

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    Falconbrook Pumping Station

    6

    Site 1 Foreshore near London Heliport, Lombard Roadis a shortlisted site because it is considered that it is less

    suitable than our preferred site. The site could affect

    residential amenity as it is adjacent to, and overlookedby, a new multi-storey residential apartment block. Road

    access is limited to a narrow route, which passes the

    recent residential development. The primary construction

    and operational access would therefore have to be via

    the River Thames and, due to the requirement for a

    cofferdam to protect the works from the River Thames

    and river-based access, the foreshore site would also take

    longer to construct.

    Site 2 Bridges Court Car Park is a shortlisted sitebecause compared to our preferred site, it is judged to

    have greater potential effects on residential and business

    amenity. The site has also been identified for residential

    use in the councils planning policies. In addition, a

    planning application for a residential scheme has been

    submitted on this site.

    Site 3 York Gardens, adjacent to York Road is ashortlisted site. It is considered less suitable than our

    preferred site due to the loss of a play area and public

    open space. Use of this site would also require the cutting

    down of mature trees, which provide the childrens centre

    with screening from York Road (A3205).

    Site 4 York Gardens, adjacent to Pennethorne House is a shortlisted site. Use of this site would result in the

    temporary loss of the public open space in York Gardensand construction activities would be in close proximity to

    the apartment block, Pennethorne House. The site would

    also likely require access through a number of narrow

    residential roads. It is therefore considered less suitable

    than our preferred site.

    Related documents:

    Changes

    Q&A Consultation

    Site selection

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    Construction

    Construction

    7

    Section 2: Construction

    Construction activitiesConstruction activities are required to intercept the

    CSO. We would construct an interception chamber to

    intercept the CSO. A connection culvert would link the

    interception chamber to a drop shaft (approximately

    40m deep) through which flows would pass down to

    a short connection tunnel. This would then join to the

    main tunnel. Figure 2A illustrates the below ground

    infrastructure proposed.

    Figure 2A: Illustration showing typical elements of below ground infrastructure

    Main tunnel

    Drop shaft

    Short connectiontunnel

    Valve chamber

    To pumping station,to River Thames

    Interception

    chamber

    Existing sewer

    Connection culvert

    These activities would take place within the area

    indicated by the red line in Figure 1A, in five main phases,

    lasting approximately three years in total. The main

    construction activities associated with these phases are

    set out in Table 2.1.

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    Falconbrook Pumping Station

    8

    Advance works

    Phase 1

    Site setup

    Figure reference Figure 2C

    Typical working hours Varies Standard

    Mainco

    nstructionactivities

    Utilities connected

    Utilities diverted or protected

    Site cleared

    Site facilities and access set up

    Drop shaft excavated and built

    Short connection tunnel excavated and built

    Above and below ground structures constructedMechanical and electrical equipment installed

    Site restored and landscaped

    Temporary site facilities removed

    Table 2.1: Main activities during construction phases

    Our typical working hours are expected to be:

    Standard: 8am-6pm weekdays, 8am-1pm Saturday*

    Extended standard: 6pm-10pm weekdays, 1pm-5pm Saturdays

    Continuous: 24 hours a day, seven days a week**

    Varies: Working hours for advanced works will depend on the nature of the works and will be agreed

    with the local authority

    * Standard working hours would also include, subject to agreement with the local authority:

    a short period (up to one hour) before works start and after they have finished to allow our workers to prepare for work and check the site. equipment and machinery maintenance could also take place 1pm-5pm Saturday and 10am-4pm Sunday.

    ** The main activities taking place 24 hours a day are below ground or within an enclosure.

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    Construction

    9

    Phase 2

    Drop shaft

    construction

    Phase 3

    Tunnelling

    Phase 4

    Construction of

    other structures

    Phase 5

    Completion of

    works and siterestoration

    Figure 2C Figure 2C Figure 2D

    Standard Continuous Standard Standard

    Related documents:

    Build

    Managing construction

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    Falconbrook Pumping Station

    10

    Site layout and construction phasesFigures 2C and 2D show how the site might be laid out

    during the construction phases, which are set out in Table2.1 and Figure 2B. These layouts have been informed by

    the size of the infrastructure proposed, the construction

    methods required and the location of neighbouring

    buildings and structures. They have also been developed

    to minimise effects on the local community and

    environment. Particular factors at this site that have

    influenced the layout are as follows:

    The size of the construction site required has beenreduced to limit the effect on the adjacent York Garden

    Library and Community Centre and York Gardens

    Adventure Playground.

    The size of the construction site has been reduced to

    utilise land in our ownership as much as possible.

    Construction site access is proposed off York Road

    (A3205) to reduce the effects on adjacent residential

    properties in the Winstanley estate.

    The site layout has been arranged so that access to the

    York Garden Library and Community Centre and YorkGardens Adventure Playground would be maintained

    during construction.

    The site layouts are indicative only, and the contractor

    may arrange the site in a different way, depending on

    the chosen construction methods, provided that any

    environmental effects are appropriately managed and

    that the main construction activities are undertaken

    within the red line shown in Figure 1A.

    P1

    P2

    P3

    P4

    P5Advance

    works

    Year 1 Year 2 Year 3

    Figure 2B: Construction timeline showing approximate

    duration of works in phases (P)

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    Construction

    11

    Figure 2C: Illustrative phases 1, 2 and 3 construction plan

    Cranes

    Drop shaft

    N

    WANDSWORTHMaximum extent ofconstruction site for

    phases 1, 2 and 3Site hoarding

    Site support/welfare

    Excavated materialstorage and processing

    Maintenance workshopand storage

    Construction support

    Internal site road

    Site access

    Existing footpathto be diverted

    Footpath diversion

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    Falconbrook Pumping Station

    12

    Figure 2D: Illustrative phase 4 construction plan

    Cranes

    Dropshaft

    Piling rig

    N

    WANDSWORTHMaximum extent ofconstruction site for

    phase 4Site hoarding

    Site support/welfare

    Maintenance workshopand storage

    Internal site road

    Site accessExisting footpathto be diverted

    Footpath diversion

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    Construction

    13

    Additional works and activitiesThe main construction works at this site are set out in

    Table 2.1. We would also need to undertake additionalworks and activities, some of which may be located

    outside of the area indicated by the red line in Figure 1A.

    The anticipated additional works and activities are set

    out in Table 2.2.

    When Type of works What we would do

    Required forconstruction

    phase

    Installation of equipment to

    monitor environmental matterssuch as noise, vibration and dust.

    The locations of monitoring equipment would be agreed with thelocal authority and relevant landowners.

    Protection works to third party

    structures (such as buildings,

    bridges and tunnels).

    We would undertake studies to identify any effects our

    construction work may have on third party structures. The studies

    may recommend particular construction methods or, in very

    limited instances, protection works.

    If protection works are required to the existing sewer, we would

    access the sewer network through existing manholes.

    Diversion of utilities.If utility diversions are required, we would work with utility

    providers to undertake the necessary works.

    Temporary connection to utilities

    (such as water, sewer, phone and

    electricity supply).

    If we are unable to make a connection to utilities within the site,

    we would need to make a connection to utilities in York Road

    (A3205) or Newcomen Road.

    Traffic management works.These may need to extend beyond our site and could includerelocating kerb lines, repainting road lines and modifying traffic

    signals.

    Required for

    operational

    phase

    Permanent connection to

    utilities (such as water, phone

    and electricity supply) for the

    operational tunnel.

    We expect to connect to utilities from within the site.

    Table 2.2: Additional works and activities

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    Falconbrook Pumping Station

    14

    Construction transport and access

    We would transport materials to and from the site by

    road. Table 2.3 sets out the anticipated average dailynumber of lorries visiting (ie travelling to and from) the

    site during the peak months of each phase.

    Construction traffic would access the site travelling south

    along York Road (A3205) and turning left into the site via

    a new entrance off York Road (A3205). A second entrance

    would be constructed to enable vehicles to exit the site

    by turning left onto York Road (A3205). The two new

    vehicle entrances would be for the construction periodonly and would be removed once work is complete. It is

    not proposed that significant numbers of construction

    vehicles would access the site via residential roads located

    to the east. This access route is shown on Figure 2E.

    Beyond this, construction traffic would use the major road

    network to get to and from its final destination.

    We would need to temporarily relocate the bus stop

    on York Road (A3205) during construction. This wouldbe returned to its current position after construction is

    completed. In addition there would be a short diversion

    of the footpath between York Road (A3205) and York

    Gardens Playground, as shown on Figures 2C and 2D.

    Based on our current design, we do not anticipate that

    any road diversions or parking bay suspensions would

    be required.

    Phase 1Site setup

    Phase 2Drop shaft

    construction

    Phase 3Tunnelling

    Phase 4Construction

    of otherstructures

    Phase 5Completion ofworks and site

    restoration

    Typical

    daily lorry

    movements

    6 lorries 9 lorries 10 lorries 6 lorries 6 lorries

    Table 2.3: Average daily lorry visits during the peak months

    Related documents:

    Transport

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    Construction

    15

    Figure 2E: Proposed access route to the site from the nearest major road

    Left turn in

    A3205

    York Road

    Left turn out

    YorkR

    oad

    N

    WANDSWORTH

    HAMMERSMITH &FULHAM

    Draft limit of land tobe acquired or used

    Internal site road

    Site access

    Local authority boundary

    Transport for London(TfL) road network

    F l b k P i St ti

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    Falconbrook Pumping Station

    16

    Management of construction worksOur construction works would be managed in accordance

    with an agreed Code of construction practice (CoCP).For phase two consultation, we have produced a draft

    CoCP Part A: General requirements, informed by CoCPsfrom other major construction projects in London and

    consultation with the local authorities. Through the

    environmental impact assessment process, scheme-

    wide principles to address potential effects on the local

    environment have been identified and integrated into

    the design. The CoCP Part A sets out scheme-wide control

    measures that would be used to minimise potentialeffects during the construction process.

    Table 2.4 sets out what we consider to be the key issues

    for this site during construction, and how we are currently

    proposing to address them.

    Related documents:

    Environment

    Managing construction

    Transport

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    Construction

    17

    Issue Our response

    Effect of construction activities on the

    recreational enjoyment and use of YorkGardens and other local amenities,

    including York Gardens Adventure

    Playground and York Garden Library and

    Community Centre.

    We would manage the construction site in order to minimise disruption to

    those using the Gardens and other local amenities. Specific measures would

    be set out in the CoCP.

    Construction activities may affect vehicle

    access and parking at York Garden

    Library and Community Centre.

    We are working with the London Borough of Wandsworth to ensure that

    the York Garden Library and Community Centre can continue to be served

    by vehicles as required, and that necessary parking is accommodated

    possibly by temporary modifications to York Gardens.

    The location of site access onto York

    Road (A3205) may disrupt vehicle flows

    along York Road (A3205) and the wider

    operation and capacity of the local road

    network.

    We have sought to minimise disruption to the local road network through

    our site layout and design. In particular, site access from York Road (A3205)

    would minimise the effect on adjacent residential roads. We would manage

    the effects of road transport through our traffic management plans, which

    will seek to limit the number of vehicle movements and hours of operation,

    identify the most suitable site access points and any necessary highway

    management arrangements.

    Reduced pedestrian access into and

    through York Gardens via the existing

    footpath to the north of the York Garden

    Library and Community Centre.

    We would provide a suitable temporary footpath diversion around the

    construction site.

    Construction activities would require the

    temporary relocation of the adjacent bus

    stop on York Road (A3205).

    The bus stop would be relocated further north along York Road (A3205) to

    avoid any potential conflict with construction vehicles entering and leaving

    the site. Following completion of construction works, it would be reinstated

    in its current location.

    Possible effect of noise and vibration on

    neighbouring areas.

    The contractor would be required to implement noise and vibration controlmeasures at the worksite, which will be set out in the CoCP. Continuous

    tunnelling would only be undertaken for a short period of time to construct

    a connection tunnel from the drop shaft to the main tunnel.

    Possible effects on local air quality and

    dust nuisance in neighbouring areas.

    Preliminary findings indicate that while there is the potential for dust

    nuisance effects, there are unlikely to be any significant local air quality

    effects at any of the sites. The contractor would put in place air and dust

    control measures at the worksite, which will be set out in the CoCP.

    Table 2.4: Key issues relating to construction

    Falconbrook P mping Station

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    Falconbrook Pumping Station

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    Section 3: Future use

    This section describes the site after the completion of the

    construction work, ie when the main tunnel is in use the

    operational phase.

    Design

    The design of the permanent use and appearance of the

    structures at Falconbrook Pumping Station follows our

    scheme-wide principles and takes into account comments

    raised during ongoing engagement with the LondonBorough of Wandsworth and other technical consultees.

    Our permanent works need to incorporate functional

    elements, which are required for the operation of the

    tunnel. These include:

    Underground structures with ground level access covers

    including: a CSO drop shaft with an internal diameter

    of approximately 9m, connection tunnel to the main

    tunnel, connection culverts, interception chamber, valve

    chamber and a passive filter chamber.

    A main ventilation column up to 6m high.

    A small diameter ventilation column to the interception

    chamber up to 6m high.

    Maintenance vehicle access.

    Electrical and control equipment installed within the

    existing pumping station.

    Table 3.1 sets out the site specific issues that have

    influenced our permanent design proposals and how wehave addressed them in our proposed design.

    Future use

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    Future

    use

    Future use

    19

    Issue Our response

    Visual effect of the permanent

    works.

    The above ground permanent works would be located mainly within the existing

    pumping station compound. The exception would be the ventilation structure and

    other permanent below ground works that would be located within well designed

    potential new areas of public space.

    The ventilation structure would be of a high quality design to ensure that it enhances

    rather than detracts from the new area of public space.

    Effect on York Gardens.

    There would be no permanent effects on York Gardens from the operation of the

    site which could be enhanced by any potential new areas of planted open space. An

    enhanced access route to the gardens would be provided.

    Effect on local amenities,

    including York Garden Library

    and Community Centre and

    the York Gardens Adventure

    Playground.

    There would be no permanent effects on the York Gardens Library and Community

    Centre or the York Gardens Adventure Playground from the operation of the site.

    The proposals would help to link parts of York Gardens with key facilities and provide

    an enhanced setting for local amenities.

    The permanent layout and design of the site would require the removal of a disused

    public toilet block, located adjacent to the pumping station in York Gardens. Ourproposals for the permanent layout and design of the site involve the replacement

    of the toilet block with a planted public area that would link York Garden Library and

    Community Centre and the York Gardens Adventure Playground.

    Table 3.1: Site specific issues that have influenced our permanent design

    Falconbrook Pumping Station

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    Falconbrook Pumping Station

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    Figure 3A: Photo of the site before the works

    Figures 3A, 3B, 3C and 3D show the current site and

    provide illustrations of our design proposals. Further

    information on the development of our design can be

    found in the Design development report.

    Related documents:

    Design

    Future use

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    Future use

    21

    Figure 3B: Artists impression of the site after the works are completed

    Falconbrook Pumping Station

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    Falconbrook Pumping Station

    22

    Figure 3C: Aerial view of the completed works

    Future use

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    23

    Figure 3D: Layout of site once construction works complete

    Ventilation structures

    within compound

    Electrical and controlequipment within

    existing building

    Timber seatingRaised planter overCSO drop shaft

    Falconbrook PumpingStation wall to be reinstated

    Existing sewer

    structure

    York

    Road

    N

    Ventilation column

    Railings to bereinstated to

    match existing

    Existing bus stopto be reinstated

    Valve chamberwithin compound

    Falconbrook Pumping Station

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    Falconbrook Pumping Station

    24

    Operation and maintenanceOnce the tunnel is operational, we expect to undertake

    inspection and maintenance of the ventilation and below

    ground equipment approximately once every three to six

    months. This will be undertaken within our site and as

    part of the existing maintenance routine.

    Once every ten years, we expect to carry out a major

    internal inspection of the tunnel and underground

    structures. This is likely to involve a small team of

    inspection staff, a small team of support crew and two

    mobile cranes to lower the team into the shaft. This is

    likely to take several days and would require temporary

    fencing around the shaft for safety and security while the

    inspection takes place.

    We may also need to make visits to the site for unplanned

    maintenance or repairs, for example, if there is a

    blockage, or equipment failure. This may require the use

    of mobile cranes and vans.

    Permanent vehicular access would be from NewcomenRoad/ Lavender Road, which is the same as the current

    arrangement for the existing pumping station.

    Management of operational effectsWe have undertaken technical work, including stakeholder

    engagement, to assess and identify the key issues

    associated with this site once it is operational. Table

    3.2 summarises these issues and how we are currently

    proposing to address them.

    Future use

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    25

    Issue Our response

    Possible odour effects during

    the operation of the tunnel.

    Odour effects at this site are expected to be negligible because we have developed

    anAir management plan to minimise possible odour and air quality effects arisingfrom the operation of the tunnel. The technology we are proposing to use at this

    site includes the use of passive below ground carbon filters that will remove possible

    odour before air leaves the ventilation equipment.

    Disturbance from future

    maintenance access.

    Permanent access would be required for maintenance and servicing purposes to

    the shaft and ventilation equipment. Any planned maintenance visits would be

    undertaken during normal working hours and all visits managed to avoid disruption

    to local residents, businesses and users of affected public areas as far as possible.Table 3.2: Key issues relating to site operation

    Related documents:

    Odour

    Further information

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    26

    u t e o at o

    This section sets out documents which may be of particular interest. Further information on our proposals can be

    found on our website (www.thamestunnelconsultation.co.uk) or is available upon request (call our customer centre

    on 0800 0721 086).

    Phase two public consultation material

    Project information papers include general information about the Thames Tunnel project. There are 17 project

    information papers which cover various aspects of the project. Those project information papers that may be of

    particular interest are set out below.

    Icon Title Details

    Build

    Provides information on the different types of sites required for the Thames Tunnel

    project and the typical construction activities that will be undertaken at each site.

    Changes

    Explains how the scheme has changed compared to that presented at phase one

    consultation, including changes to the tunnelling strategy for the main tunnel and

    changes to sites.

    Q&A Consultation

    Sets out the consultation we have undertaken to date on the project, the scope

    of this phase two consultation and how interested parties can respond to thisconsultation.

    DesignContains the design principles which have influenced the permanent appearance of

    our sites once construction work is complete.

    EnvironmentSets out the process the project is following to assess potential environmental effects

    of the Thames Tunnel project.

    Managing

    construction

    Includes information on what measures our contractors will put in place at our sites

    during construction.

    Odour Sets out ourAir management plan and how it will work.

    Options Outlines the various ways to deal with sewage overflows.

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    Phase two public consultation material

    Icon Title Details

    OverflowSets out how Londons sewerage system works and why the capital has an overflow

    problem.

    Route and

    tunnel

    alignment

    Sets out the preferred route of the main tunnel and the reasons for our preference.

    Site selection Sets out the process we followed to find and select our preferred sites.

    Transport Contains information on the different transport options we have considered fordelivering and removing materials from our sites.

    Further information

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    Technical reports

    Theme Icon Title Details

    Interim

    engagement

    Interim engagement

    report

    Provides a summary of the public engagement we

    have undertaken between phase one and phase two

    consultations.

    Phase one

    consultation1

    SUMMARY

    Report on phase one

    consultation:

    summary report

    Provides a summary of the comments made at phase one

    consultation and our responses.

    Phase two

    construction

    information

    Code of construction

    practice Part A:

    General requirements

    (CoCP)

    Sets out control measures to be adopted during the project

    construction period.

    Phase twoenvironmental

    information

    Air management

    plan

    Outlines the methods which we will use to manage odour

    from the main tunnel at all our preferred sites.

    Preliminary

    environmental

    information report

    (PEIR)

    Contains initial assessments on the environmental effects of

    the Thames Tunnel project based on information collected

    to date. Please refer to volume 14 of the non-technical

    summary and volume 14 of the PEIR for more information

    on this site.

    Phase two scheme

    development

    Design development

    report

    Provides a general overview of how the scheme design at

    each site has evolved to date. Please refer to chapter 11 for

    more information on this site.

    2

    Phase two scheme

    development report

    Provides an overview of the development of the Thames

    Tunnel project and how each site was chosen. Please refer to

    Appendix H for more information on this site.

    Site glossary

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    29

    g y

    Term Definition

    Carbon filters Filters that remove odours before the air is released from the tunnel.

    CofferdamA wall that is constructed within the river around the outside of the working area and then

    pumped dry. The inside of the cofferdam can then be filled to create a safe working area.

    Combined sewer A single sewer system that takes both rainwater and domestic and industrial wastewater.

    Combined sewer

    overflow (CSO)

    A structure, or series of structures, that allows sewers to overflow into the river when they

    are full as a result of increased rainfall. Without the overflow, the sewer would back up and

    cause flooding in streets or houses.

    Connection tunnel A tunnel connecting a drop shaft to the main tunnel.Draft limit of land to be

    acquired or used

    The extent of land that we may need to use or acquire, or over which rights may be needed

    to carry out works that are essential to the project.

    Drop shaft

    A vertical circular concrete structure, used to drop flows from the high level of the CSO to

    the low level of the main tunnel. It would also be used to provide access to construct the

    connection tunnels.

    Foreshore Ground uncovered by the river when the tide is low.

    Interception chamberA structure, built on an existing combined sewer, which diverts stormwater overflow into themain tunnel.

    Main tunnel The tunnel from Acton Storm Tanks to Abbey Mills Pumping Station.

    Operational phase After the completion of the construction work, when the main tunnel is in use.

    Thames Tunnel project

    The Thames Tunnel project comprises a storage and transfer tunnel, from west London to

    Beckton Sewage Treatment Works in east London, and the control of 34 CSOs along the

    Thames Tideway.

    Transport for London

    Road Network (TLRN)

    The network of roads managed by Transport for London. These are the major or strategic

    roads, which have high capacity.

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    Falconbrook Pumping Station

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    32

    Phase two consultation: Falconbrook Pumping Station

    For further information or to comment on our

    proposals see our website:

    www.thamestunnelconsultation.co.uk

    110-ED-PNC-00000-000081

    Autumn 2011

    It is very important that you understand theinformation we have provided. If you needfurther information in another language,

    braille, large print or audio format pleasecontact us on 0800 0721 086.