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    Introd

    uction

    HammersmithPumping 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 ofthe 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 Hammersmith Pumping Station.

    Thames Tunnel

    1

    Key facts

    Local authority: Hammersmith and Fulham

    CSO name: Hammersmith Pumping StationCSO spill volume in an average year: 2,200,000m (equivalent to approximately

    880 Olympic swimming pools)

    Site type: CSO site

    Duration of main construction works: Approximately three years.

    Siteinformationpaper

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    Hammersmith Pumping Station

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    Section 1: Introduction and site informationWe are proposing to use part of a currently vacant site

    known as Hammersmith Embankment/Fulham Reach atthe corner of Chancellors Road and Distillery Road for

    this construction work 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 Hammersmith Pumping Station CSO, to the main

    tunnel.

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

    includes our existing pumping station, located to thesouth of Chancellors Road together with part of the

    Hammersmith Embankment/Fulham Reach development

    site. The remainder of the Hammersmith Embankment/

    Fulham Reach development site is located to the south

    and west. Beyond Distillery Road, which is to the east

    of the site, is Frank Banfield Park. Along Chancellors

    Road, to the north and west of our site, are residential

    properties and offices. The site is within the Fulham ReachConservation Area.

    This site information paper sets out our proposals at

    Hammersmith Pumping Station. We have also produced

    project 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.

    Related documents:

    Build

    How we chose this siteCSO

    What we proposed at phase one consultation

    Through our site selection process, we identified three

    possible shortlisted sites to intercept the Hammersmith

    Pumping Station CSO. At phase one consultation, which

    was held between September 2010 and January 2011, wepresented these sites:

    Foreshore, adjacent to Chancellors Wharf

    Frank Banfield Park

    Hammersmith Pumping Station.

    Hammersmith Pumping Station was identified as our

    preferred site to intercept the Hammersmith Pumping

    Station CSO at phase one consultation.

    Why we have amended our proposals

    Since January 2011, we have considered the comments

    received at 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 HammersmithPumping Station CSO.

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    Introduction

    3

    Figure 1A: Hammersmith Pumping Station location plan

    N

    HammersmithPumpingStation CSO

    HammersmithEmbankment/Fulham Reach

    HammersmithPumping Station

    Frank Banfield ParkHammersmith

    Bridge Chan

    cello

    rsRoad

    DistilleryRoad

    Fulham

    PalaceRoad

    RICHMOND UPONTHAMES

    HAMMERSMITH &FULHAM

    Local authorityboundary

    Draft limit of land tobe acquired or used

    Proposed tunnelroute centreline

    Existing sewer

    Existing CSO

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    Hammersmith Pumping Station

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    What we are proposing at phase two consultation

    We have identified five shortlisted sites to intercept the

    CSO, as shown in Figure 1B. These are:Foreshore, adjacent to Chancellors Wharf (site 1)

    Frank Banfield Park (site 2)

    Adjacent to Hammersmith Pumping Station,

    Chancellors Road (site 3)

    Thames Water Depot and Pumping Station,

    Chancellors Road (site 4)

    Hammersmith Pumping Station (our preferred site).

    Hammersmith Pumping Station is our preferred siteto intercept the Hammersmith Pumping Station CSO.

    This is because it is a brownfield site with good access

    and the construction works could be coordinated with

    the proposed mixed use development at Hammersmith

    Embankment/Fulham Reach. The shaft is located further

    away from existing residential dwellings than would be

    the case in the other shortlisted sites. The site is alsosmaller than the site presented at phase one consultation

    (since we only need a site to intercept the CSO).

    Site 1 Foreshore, adjacent to Chancellors Wharfisa shortlisted site which is considered to be less suitable

    than our preferred site because vehicular access from

    the public highway network is severely limited and

    construction activities would have more effects on the

    local area and the River Thames.

    Site 2 Frank Banfield Park is a shortlisted site whichis considered to be less suitable than our preferred site

    because the use of site would result in the loss of public

    open space.

    Site 3 Adjacent to Hammersmith Pumping Station,Chancellors Road is a shortlisted site which is considered

    to be less suitable than our preferred site because thedrop shaft location would limit the potential for future

    development of this brownfield site.

    Site 4 Thames Water Depot and Pumping Station,

    Chancellors Road is a shortlisted site which is consideredto be less suitable than our preferred site becauselocating the drop shaft in the depot would have greater

    potential effects on the adjacent residential properties.

    Depending on the site layout when intercepting the

    CSO, we would need to undertake some of the works in

    Chancellors Road, which would mean closing the road for

    between nine to eighteen months.

    Main tunnel and long connection tunnel

    What we proposed at phase one consultation

    Through our site selection process, we identified that a

    main tunnel reception site and long connection tunnel

    drive site was required in the Hammersmith Bridge area.

    We identified two shortlisted sites and presented these

    at phase one consultation, which was held betweenSeptember 2010 and January 2011.

    The sites were:

    St Pauls School Playing Fields

    Hammersmith Pumping Station

    Hammersmith Pumping Station was identified as our

    preferred site at phase one consultation.

    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 work led us to review possible

    sites within the western end of the main tunnel and our

    tunnelling strategy, which considers how sites might belinked together to construct the main tunnel.

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    Introduction

    5

    Figure 1B: Preferred and shortlisted sites

    N

    Site 2

    Site 1

    Site 3

    Site 4

    FulhamPalaceRoad

    HammersmithBridge

    RICHMOND UPONTHAMES

    HAMMERSMITH &FULHAM

    Preferred site Hammersmith

    Pumping StationOther shortlistedsite locations

    Local authorityboundary

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    Hammersmith Pumping Station

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    Since phase one consultation, a new planning application

    for mixed use development has been submitted,

    which covers the area around the Hammersmith

    Pumping Station site. If planning permission isgranted, construction could start in the near future.

    The development proposals mean that there would be

    insufficient space to accommodate a main tunnel site

    at the Hammersmith Pumping Station site. Therefore,

    we needed to find an alternative site to receive the main

    tunnel.

    Our review of our tunnelling strategy concluded that the

    long connection tunnel, which would link flows from ActonStorm Tanks to the main tunnel, needs to be a similar

    diameter to the main tunnel. Therefore we propose to

    extend the main tunnel to Acton Storm Tanks to enable

    direct connection of the CSO to the main tunnel. This

    means that a main tunnel site is no longer required at

    Hammersmith Pumping Station.

    Related documents:

    Changes

    Q&A Consultation

    Site selection

    Acton Storm Tanks

    Carnwath Road Riverside

    AST

    CRR

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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

    33m 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. 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 at this

    site are set out in Table 2.1.

    Related documents:

    Build

    Managing construction

    Main tunnel

    Drop shaft

    Valve chamberShort connection

    tunnel

    To pumping stationto River Thames

    Interceptionchamber

    Existing

    overfowsewer

    Connection culvert

    Figure 2A: Illustration showing typical elements of

    below ground infrastructure

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    Hammersmith Pumping Station

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    Advance works

    Phase 1

    Site setup

    Figure reference Figure 2C

    Typical working hours Varies Standard

    Mainconstructionactivities

    Utilities connected Utilities diverted or protected

    Site cleared

    Site facilities and access set up

    Drop shaft excavated and built

    Short connection tunnel excavated and builtAbove and below ground structures constructed

    Mechanical and electrical equipment installed

    Site restored and landscaped where necessary

    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 with occasional

    extended standardContinuous Standard Standard

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    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:

    We have arranged the site offices so that they would bepositioned along the northern boundary of the site to

    act as a screen from the construction activities for the

    residents on Chancellors Road.

    Effects of construction works on adjacent land uses

    have been minimised by siting as much of the works

    as possible within the existing Hammersmith Pumping

    Station site.

    Access to the site has been located so that it could beshared with the neighbouring developer.

    P1

    P2

    P3

    P4

    P5

    Year 1 Year 2 Year 3

    Adva

    nce

    works

    The site layouts are indicative only, and the contractor

    may arrange the site in a different way, depending onthe 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.

    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

    N

    Cranes

    Drop shaft

    Maximum extent ofconstruction site forphases 1, 2 and 3

    Site hoarding

    Site support/welfare

    Excavated materialstorage and processing

    Maintenance workshopand storage

    Construction support

    Internal site road

    Site access

    Existing footpath tobe diverted

    Footpath diversion

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    Hammersmith Pumping Station

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    Figure 2D: Illustrative phase 4 construction plan

    N

    Crane

    Drop shaft

    Maximum extent ofconstruction site forphase 4

    Site hoarding

    Site support/welfare

    Excavated materialstorage and processing

    Maintenance workshopand storage

    Internal site road

    Site access

    Existing footpath to

    be diverted

    Footpath diversion

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    Construction

    13

    Additional works and activitiesThe main construction activities 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 for

    constructionphase

    Installation of equipment to monitorenvironmental matters such as noise,

    vibration and dust.

    The locations of monitoring equipment would be agreed

    with the local 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.

    Diversion of utilities. Utility diversions may need to be carried out outside ofthe site boundary.

    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 in either

    Chancellors Road or Distillery Road.

    Traffic management works.

    These may need to extend beyond our site and could

    include relocating 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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    Construction transport and accessWe would transport materials to and from the site by

    road. We have considered the use of the River Thamesto transport materials to and from this site. However the

    planned Hammersmith Embankment/ Fulham Reach

    development, which is likely to be in place when we start

    construction, would make river transport from this site

    impractical. Table 2.3 sets out the anticipated average

    daily number of lorries visiting (ie travelling to and from)

    the site during the peak months of each phase.

    Construction traffic would access the site fromthe Hammersmith Flyover (A4), travelling around

    Hammersmith roundabout, down Fulham Palace Road

    (A219) and Chancellors Road, and turning into the site

    from a new entrance on Distillery Road. Traffic would

    leave the site via the same route. 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 may need to suspend or relocate some on-street

    parking bays along Chancellors Road during construction.There would be minor footpath diversions around the

    site, as shown on Figures 2C and 2D. Based on our current

    design, we do not anticipate that any road diversions, bus

    stop relocations or junction changes would be required.

    Phase 1

    Site setup

    Phase 2

    Drop shaftconstruction

    Phase 3

    Tunnelling

    Phase 4

    Constructionof other

    structures

    Phase 5

    Completion ofworks and site

    restoration

    Average daily

    lorry visits4 lorries 13 lorries 13 lorries 13 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

    DistilleryRoad

    Right turn in,left turn out

    Possiblesuspensionof parking

    A4 A4

    A219

    Distillery Road

    Fulham Palace Road

    Chancellors Road

    NRICHMOND UPON

    THAMES

    HAMMERSMITH &FULHAM

    Draft limit of land tobe acquired or used

    Internal site road

    Site access

    Local authority boundary

    Transport for London(TfL) road network

    Proposed lorry access toTfL road network

    H ith P i St ti

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    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

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    Construction

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    Issue Our response

    Possible effect on the early

    commencement of the plannedHammersmith Embankment/Fulham

    Reach mixed use development

    by St George PLC on the vacant

    Hammersmith Embankment site

    adjacent to the pumping station.

    We have worked with the developer to agree a programme of works

    that would facilitate both the construction of the tunnel and phased

    commencement of their development.

    Potential loss of and damage to trees

    near the corner of Chancellors Roadand Distillery Road.

    Only a small number of trees would need to be removed in this location.

    We are in discussions with the developer of the proposed Hammersmith

    Embankment/Fulham Reach development regarding their plans for this part

    of the site, which would include any replacement planting, if necessary.

    Possible effect of construction vehicles

    on the volume of traffic on Chancellors

    Road and Distillery Road, with

    associated effects on local residents

    trying to access Frank Banfield Park.

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

    our site layout and design. 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.

    Possible effect of noise and vibration on

    neighbouring areas.

    The contractor would be required to implement noise and vibration control

    measures 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

    Related documents:

    Managing construction Transport

    Hammersmith P mping 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

    Since phase one consultation, we have progressed the

    design for the permanent use and appearance of the

    structures at Hammersmith Pumping Station. The design

    of the permanent proposals follows our scheme-wideprinciples and takes into account comments made

    and ongoing engagement with the London Borough

    of Hammersmith and Fulham 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 11m, connection tunnel to the main

    tunnel, connection culvert, interception chamber, valve

    chamber and a passive filter chamber.

    A ventilation structure up to 6m high.

    Maintenance vehicle access.

    Table 3.1 sets out the site specific issues that have

    influenced our permanent design proposals and how we

    have addressed them in our proposed design.

    Future use

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    Future

    use

    Future use

    19

    Issue Our response

    Effects on surrounding

    residents and proposed new

    properties of the planned

    Fulham Reach residential

    development.

    The permanent works have been designed in conjunction with the new mixed use

    development proposed at the Hammersmith Embankment/Fulham Reach site to

    ensure the designs are complementary.

    The arrangement of the permanent works means that they would either be located

    underground, within the existing pumping station site or within new public areas,

    thereby minimising the effect on existing and future residential properties.

    Existing site utilities.The permanent works have been designed to minimise the effect and any risk of

    disruption to existing utilities along Chancellors Road.

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

    Hammersmith 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

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

    Hammersmith Pumping Station

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    Hammersmith Pumping Station

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    Figure 3C: Aerial view of the completed works

    Future use

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    Figure 3D: Layout of site once construction works complete

    Landscaping of shaftand access covers to becompleted by others as

    part of development

    Residential development(by others)

    Existing sewerstructure

    Ventilation structuresadjacent to existingsewer structure

    New boundary wallAccess formaintenance vehicles

    Chan

    cello

    rsRoa

    d

    DistilleryRoad

    N

    Electrical and controlequipment locatedwithin existing building

    HammersmithPumping Station

    Hammersmith Pumping Station

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    Operation and maintenanceOnce the tunnel is operational, we would need access

    to the site occasionally for inspection and maintenance

    purposes. We expect to visit the site approximately

    once every three to six months to carry out inspections

    and maintenance of the ventilation and below ground

    equipment. This is likely to involve a visit by staff in a

    small van, and may take several hours.

    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.

    Access would be from within the pumping station

    compound on Chancellors Road, or from Distillery Road.

    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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    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 developedanAir 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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    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.

    Site information papers provide information that relate to each preferred site along the route of the Thames Tunnel

    project. The following site information papers may be of particular interest.

    Acton Storm Tanks

    Carnwath Road RiversideCRR

    AST

    Further information

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    Technical reports

    Theme Icon Title Details

    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 two

    environmental

    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 8 of the non-technical summary

    and volume 8 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 5 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 B 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.

    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 overflows, the sewers would back up

    and cause flooding in streets or houses.

    Connection tunnel A tunnel connecting a drop shaft to the main tunnel.

    Conservation areaAn area designated by the local authority or English Heritage as having special

    architectural or historical interest.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/connection

    tunnel drive site

    A site that would be used to construct the main tunnel or connection tunnel. The excavated

    material would be removed from the tunnel and the concrete tunnel lining segments would

    be delivered to the tunnel at the main/connection tunnel drive site.

    Main tunnel/connection

    tunnel reception site

    The tunnel would be constructed from a drive site to a reception site. Once the tunnel

    arrives at the reception site, the tunnel boring machine would be dismantled and removed.

    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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    Hammersmith Pumping Station

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    32

    Phase two consultation: Hammersmith Pumping Station

    For further information or to comment on our

    proposals see our website:

    www.thamestunnelconsultation.co.uk

    110-ED-PNC-00000-000083

    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.