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    Introd

    uction

    Introd

    uction

    Barn Elms

    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 Barn Elms.

    Thames Tunnel

    Siteinformatio

    npaper

    1

    Key facts

    Local authority: Richmond upon Thames

    CSO name: West Putney Storm Relief

    CSO spill volume in an average year: 34,000m (equivalent to approximately

    14 Olympic swimming pools)

    Site type: CSO site

    Duration of main construction works: Approximately two and a half years.

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    Barn Elms

    2

    We are proposing to use the south eastern corner of the

    Barn Elms Schools Sports Centre 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 West Putney

    Storm Relief, to the main tunnel.

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

    Path and River Thames are located to the east of the site.

    To the north are some of the Barn Elms Schools Sports

    Centre pitches and facilities. Putney Lower Commonis located to the southwest. At the most southerly

    point of the site are Beverley Brook and the Beverley

    Brook footpath, which separate the London Boroughs

    of Richmond upon Thames and Wandsworth in this

    location. The site is adjacent to the Putney Embankment

    Conservation Area. The site also includes a maintenance

    site access road that would link to Queen Elizabeth Walk.

    This site information paper sets out our proposals at BarnElms. 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.

    Section 1: Introduction and site information

    Related documents:

    Build

    How we chose this siteMain tunnel

    What we proposed at phase one consultation

    Through our site selection process, we identified

    that a main tunnel drive site was required between

    Hammersmith Bridge and Albert Bridge. At phase one

    consultation, which was held between September 2010and January 2011, Barn Elms was identified as being

    appropriate for this purpose and was presented as our

    preferred site. We assessed other sites but only Barn Elms

    made it through to the shortlist stage of the site selection

    process.

    What we are proposing at phase two consultation

    Since January 2011, we have considered the comments

    from phase one consultation, feedback from ongoing

    engagement and new information; and undertaken

    further technical work. As a result, we have re-assessed

    potential main tunnel sites and our tunnelling strategy for

    the main tunnel. We have now identified Carnwath Road

    Riverside as the most suitable site. Therefore Barn Elms is

    no longer our preferred site for a main tunnel drive site.

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    Introduction

    3

    Figure 1A: Barn Elms location plan

    West PutneyStorm Relief CSO

    Barn ElmsPlaying Fields

    Barn Elms SchoolsSports Centre

    Putney Lower

    Common

    Beverley BrookHorne Way

    MillHillRoad

    QueenEliza

    bethWalk

    N

    RICHMOND UPONTHAMES

    WANDSWORTH

    HAMMERSMITH &FULHAM

    Local authority boundary

    Draft limit of land to beacquired or used

    Proposed tunnelroute centreline

    Existing sewer

    Existing CSO

    RocksLa

    ne

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    Barn Elms

    4

    CRR

    CSO

    What we proposed at phase one consultationThrough our site selection process, we identified four

    possible shortlisted sites to intercept the West Putney

    Storm Relief CSO. At phase one consultation, which was

    held between September 2010 and January 2011, we

    presented these sites:

    Foreshore, adjacent to Barn Elms

    Boat Repair Yard, off Putney Embankment

    Leaders Gardens, Putney Embankment

    Barn Elms.

    Barn Elms was identified as our preferred site at phase

    one consultation.

    What we are proposing at phase two consultation

    We have considered the comments from phase oneconsultation, feedback from ongoing engagement and

    new information; and undertaken further technical

    work. We still consider that Barn Elms should remain our

    preferred site to intercept the West Putney Storm ReliefCSO.

    The site is located in the southern corner of Barn Elms,

    which is a good location because we can directly intercept

    the CSO. We also avoid having to construct pipes beneaththe high pressure gas main and reduce encroachment

    into the playing fields.

    The size of the site required at Barn Elms is significantly

    smaller than presented at phase one consultation, since

    we only need a site to intercept the CSO in this location.

    This means that the temporary effects on the playing

    fields would be reduced. We would no longer need to

    relocate the Scout Hut or divert the Thames Path. We

    would not need to construct a new temporary jetty and

    mooring structures, since the reduction in excavated

    material would not justify the associated costs and

    disruption.

    Related documents:

    Changes

    Q&A Consultation

    Site selection

    Carnwath Road Riverside

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    Construction

    Construction

    5

    Section 2: Construction

    Construction activitiesConstruction activities are required to intercept theCSO. We would construct an interception chamber to

    intercept the CSO. A connection culvert would link the

    interception chamber to a drop shaft (approximately

    34m deep), through which flows would pass down

    to a short connection tunnel. This would 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 connection

    tunnel Valve chamber

    ExistingoverfowtoBeverley Brook

    Interceptionchamber

    Existingoverfowsewer

    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 two and a half years in total. The

    main construction activities associated with these phases

    are set out in Table 2.1.

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    Barn Elms

    6

    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 built

    Above and below ground structures constructed

    Mechanical 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

    7

    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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    Barn Elms

    8

    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:

    Owing to the change in function of the site sincephase one consultation from a main drive to a CSO

    interception site, the location of the construction site

    is now in the south of the previous Barn Elms site,

    adjacent to the Beverley Brook watercourse. This means

    that the site is smaller and the potential effect on the

    sports pitches has been confined to a temporary loss

    during construction.

    Access to and construction on the foreshore of the

    River Thames are no longer required, eliminating the

    potential effect on river navigation and river users; and

    avoiding the need to relocate the Scout Hut or divert

    the Thames Path.

    At phase one consultation, two different options

    for site access were proposed; a third option wasconsidered following feedback from phase one

    consultation. Where possible, we have discussed these

    options with relevant stakeholders and the option to

    construct a temporary access road from Rocks Lane

    (A306) along the northern side of the Beverley Brook

    watercourse is preferred. This option reduces the effect

    on common land, avoids Queen Elizabeth Walk, is

    considered safer as there would be no interaction with

    users or pitches and does not interfere significantlywith public access routes.

    The site layouts are indicative only. 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.

    Figure 2B: Construction timeline showing approximateduration of works in phases (P)

    P1

    P2

    P3

    P4

    P5

    Year 1 Year 2

    Advance

    works

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    Construction

    9

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    Barn Elms

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

    Cranes

    Drop shaft

    N

    RICHMOND UPONTHAMES

    WANDSWORTH

    See inset

    Inset

    RocksLane

    Beverley Brook

    Maximum extent of constructionsite for phases 1, 2 and 3

    Site hoarding

    Local authority boundary

    Site support/welfare

    Excavated materialstorage and processing

    Maintenance workshopand storage

    Construction support

    Internal site road

    Site access

    Existing Thames Path

    HAMMERSMITH &FULHAM

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    Construction

    11

    Drop shaft Crane

    N

    WANDSWORTH

    See inset

    RICHMOND UPONTHAMES

    Inset

    RocksLane

    Beverley Brook

    Figure 2D: Illustrative phase 4 construction plan

    Maximum extent ofconstruction site for phase 4

    Site hoarding

    Local authority boundary

    Site support/welfare

    Maintenance workshopand storage

    Internal site road

    Site access

    Existing Thames Path

    HAMMERSMITH &FULHAM

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    Barn Elms

    12

    Additional works and activitiesThe main construction activities at this site are set out in Table 2.1. We would also need

    to undertake additional works and activities, some of which may be located outside ofthe 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 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 constructionwork 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.

    Temporary connection to utilities

    (such as water, sewer, phone and

    electricity supply).

    We expect to connect to utilities in Rocks Lane (A306).

    Traffic management works.

    These may need to extend beyond our site and could include

    relocating kerb lines, repainting road lines, temporary relocation of

    a bus stop on Rocks Lane (A306)and modifying traffic signals.

    Provision of changing roomfacilities.

    The existing southern pavilion changing rooms are on the

    alignment of the construction site access road. There is an existing

    planning permission for the demolition and redevelopment of

    the southern pavilion changing rooms, which has yet to be taken

    forward. If this planning permission is not implemented, aspart of our works at this site we would need to relocate/replace

    the southern pavilion changing rooms. Replacement/relocated

    changing rooms would be provided outside of the area indicated by

    the red line in Figure 1A, in a location agreed with London Borough

    of Wandsworth and the Barn Elms Sports Trust.

    Required for

    operational

    phase

    Permanent connection to

    utilities (such as water, phone

    and electricity supply) for theoperational tunnel.

    We expect to connect to utilities either from Rocks Lane (A306) or

    from the Thames Path.

    Table 2.2: Additional works and activities

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    Construction

    13

    Construction transport and accessWe propose to 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, we

    consider that the cost and disruption to the Thames Path

    and recreational boating activities associated with the

    construction of a temporary jetty and mooring structures

    are not justified, given the need to move relatively small

    volumes of material from this site. 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 from Upper

    Richmond Road (A205), travelling along Rocks Lane

    (A306) and turning right into the site through an existing

    entrance that would need to be modified. A temporary

    road would be constructed along the northern side of

    the Beverley Brook, following the southern edge of Barn

    Elms Playing Fields and the Barn Elms Schools Sports

    Centre. 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.

    At phase one consultation we presented two options

    to access the site, one off Rocks Lane (A306) and one

    via Queen Elizabeth Walk by extending an access route

    between the Boat House Facility and the proposed

    site. The Rocks Lane (A306) access was chosen based

    on feedback during phase one consultation andbecause this access would provide separation between

    construction traffic and users of Queen Elizabeth Walk,

    and the adjacent facilities which it serves. Following

    phase one consultation a third access route off Lower

    Richmond Road via Putney Lower Common was

    considered. This route was ruled out due to loss of trees,

    effect of crossing the Beverley Brook, effect on common

    land, diversion of a number of footpaths and the

    increased effect on nearby residents.

    We may need to relocate the southbound Ranelagh

    Avenue bus stop on Rocks Lane (A306) for the duration

    of the works. We may also need to suspend or relocate

    some on-street parking on Rocks Lane (A306) opposite

    the site entrance. Based on our current design, we do

    not anticipate that any footpath or road diversions 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 visits 2 lorries 6 lorries 7 lorries 6 lorries 8 lorries

    Table 2.3: Average daily lorry visits during the peak months

    Related documents:

    Transport

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    Barn Elms

    14

    A306

    Rocks Lane

    RocksLa

    ne

    A205

    N

    Right turn in,left turn out

    Suspensionof parking

    Bus stop to berelocated

    RICHMOND UPONTHAMES

    WANDSWORTH

    HAMMERSMITH &FULHAM

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

    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

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    Construction

    15

    Related documents:

    Environment

    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.

    B El

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    Barn Elms

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    Issue Our response

    Possible relocation of the ScoutHut, which is located to the east

    of the site, between the playing

    fields and the River Thames.

    Since phase one consultation, the decision to use Barn Elms as a CSO-only sitemeans that the scout hut would not be directly affected. If necessary, suitable

    mitigation measures would be implemented to reduce any possible construction

    effects on the Scout hut.

    Temporary loss of sports pitches

    during construction.

    Since phase one consultation, the decision to use Barn Elms as a CSO-only site

    means that the potential effect on sports pitches has been confined to a temporary

    loss during construction. We are currently investigating temporary replacement

    options in the local area. It is not anticipated that there would be any permanent

    loss of sports pitches.

    Loss of southern pavilion

    changing rooms to form the

    construction access road from

    Rocks Lane (A306).

    There is an existing planning permission for the demolition and redevelopment of

    the southern pavilion changing rooms, which has yet to be taken forward. If this

    planning permission is not implemented, as part of our works at this site we would

    need to relocate/replace the southern pavilion changing rooms. We would discuss

    any necessary alternative arrangements with the local authority and Barn Elms

    Sports Trust.

    Potential loss of and damage totrees to form the construction

    access road from Rocks Lane

    (A306).

    Only a very small number of trees would need to be removed. The route of theaccess road has sought to minimise the effect on existing trees, vegetation and the

    river bank as far as possible, in combination with careful root protection, pollarding

    and trimming methods.

    Possible diversion of the Thames

    Path.

    Access to the riverside is not required at this site; the Thames Path would not

    therefore be affected in this location.

    Possible effect of foreshore

    construction activities on river

    navigation and river users.

    Since phase one consultation, the decision to use Barn Elms as a CSO-only site

    means that construction on the foreshore of the River Thames is no longer required.

    Consequently, our works would have no effect on the River Thames.

    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 small connection

    tunnel from the drop shaft to the main tunnel.

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    Construction

    17

    Issue Our response

    Possible effects on local airquality 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.

    Possible effects of construction

    activities on the Beverley Brook

    Site of Importance for Nature

    Conservation (SINC).

    Ecological surveys are being undertaken to identify possible effects arising from

    construction activities and ensure that they are carefully located and managed to

    minimise direct effects on local wildlife. The contractor would put in place various

    control measures at the worksite to minimise these effects, as far as possible. These

    will be set out in the CoCP.Table 2.4: Key issues relating to construction

    Related documents:

    Managing construction

    Barn Elms

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    Barn Elms

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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.

    DesignSince phase one consultation we have progressed the

    design for the permanent use and appearance of the

    structures at Barn Elms. The design of the permanent

    proposals follows our scheme-wide principles and takesinto account comments made and ongoing engagement

    with the London Borough 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 including: a CSO drop shaft

    with an internal diameter of approximately six metre

    connection tunnel to the main tunnel, connection

    culvert, interception chamber, valve chamber and a

    passive filter chamber.

    An above ground structure over the CSO drop shaft toprovide access into the shaft.

    An above ground structure incorporating an electrical

    and control kiosk, access to the interception chamber

    and a ventilation column.

    Maintenance vehicle access.

    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

    Preserving existing sports

    pitches, facilities and

    infrastructure.

    The permanent works have been located close to the existing CSO at its interception point

    to avoid the permanent loss of any sports pitches.

    Since phase one consultation we have significantly reduced the potential effect on

    Metropolitan Open Land by minimising the footprint of the permanent works.

    To avoid disturbance of the high pressure gas main to the north of the site, the permanent

    works have been located a suitable distance away.

    Visual effect of the

    permanent works.

    The permanent works would be enclosed by two separate structures that we are

    considering cladding with habitat walls. In combination with additional planting, thiswould aim to increase biodiversity and reduce visual effects by blending with the landscape

    through good design.

    A free standing ventilation column is not proposed at this site. All ventilation equipment is

    enclosed within the two structures.

    Loss of wildlife habitat.

    Ecological surveys are being undertaken to identify specific species and types of flora and

    fauna that may be affected by the permanent works. We are also considering various

    landscape design features for wildlife, including habitat walls for both structures on site,dense border vegetation and wild flower planting.

    The permanent access road would be composed of a reinforced concrete material that

    allows grass to grow through to retain the ecological value and visual amenity of the site.

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

    Barn Elms

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    Barn Elms

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

    provide an illustration of our design proposals. Further

    information on the development of our design can be

    found in the Design development report.

    Related documents:

    Design

    Figure 3A: Image of the site before the works*

    *This photo has been digitally enhanced to remove temporary construction works on the site at the time that the photograph was taken.

    Future use

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    Future use

    21

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

    Barn Elms

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    Barn Elms

    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

    Felled logs forhabitat growth

    Felled logs forhabitat growth

    Chain link fence tobe reinstated alongsite boundary

    CSO drop shaftconcealed withinhabitat wall

    Biodiverse roofover electrical andcontrol kiosk

    Access for maintenancevehicles with reinforcedgrass system

    Interception structures, ventilation structuresand control kiosk integrated into single aboveground structure concealed by habitat wall

    N

    Habitat wall

    Barn Elms

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    Barn Elms

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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.

    Permanent vehicular access would be from Queen

    Elizabeth Walk. We would extend the existing permanent

    access route south of the boat house facilities with a

    reinforced ground material that allows grass to grow

    through. This has been chosen to minimise the visual

    effect on Barn Elms Schools Sports Centre.

    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 developedanAir management planto 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

    BuildProvides 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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    CRR

    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 paper may be of particular interest.

    Carnwath Road Riverside

    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 9 of the non-technical summary

    and volume 9 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 6 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 toAppendix C for more information on this site.

    Site glossary

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    g y

    Term Definition

    Biodiversity The variety of plant and animal species in a given environment.

    Biodiverse roofA roof which supports a wide variety of plant and animal species and reduces

    stormwater runoff.

    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 the

    main 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 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 LondonRoad Network (TLRN)

    The network of roads managed by Transport for London. These are the major or strategicroads, which have high capacity.

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    Barn Elms

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    Phase two consultation: Barn Elms

    For further information or to comment on our

    proposals see our website:

    www.thamestunnelconsultation.co.uk

    110-ED-PNC-00000-000070

    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.