P2 Acton SIP

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Thames Tunnel

Siteinformationpaper

1

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 Acton Storm Tanks.

Introd

uction

Acton Storm Tanks

Key facts

Local authority: Ealing

CSO name: Acton Storm Relief

CSO spill volume in an average year: 310,000m (equivalent to approximately

124 Olympic swimming pools)

Site type: CSO and main tunnel reception site

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


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Acton Storm Tanks

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Section 1: Introduction and site informationWe are proposing to use parts of our existing pumping

station and storm water tanks site (Acton StormTanks) for this construction work and to accommodate

permanent building and structures required to operate

the main tunnel. The site would receive the main tunnel

from Carnwath Road Riverside and connect the existing

local CSO, known as the Acton Storm Relief CSO, to the

main tunnel.

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

includes six large open storm tanks, pumping station andlandscaped areas within our existing operational site. The

site also includes Canham Road. To the north west, north

east, south and east of the site are residential properties.

These include the Factory Quarter development and

properties on Emlyn Gardens and Greenend Road. A

mixed use industrial estate is located to the north west

and a number of commercial premises to the north of

Canham Road.This site information paper sets out our proposals at

Acton Storm Tanks. 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 Acton Storm

Relief CSO. At phase one consultation, which was

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

Former Hospital, Netheravon Road South

Car park, Welstead Way

Acton Storm Tanks.

Acton Storm Tanks was identified as our preferred site

at phase one consultation. We proposed to use a long

connection tunnel to connect the CSO to the main tunnel.

What we are proposing at phase two consultation

We have considered the comments from phase one

consultation, feedback from ongoing engagement and

new information; and undertaken further technical work.

Redevelopment of the Former Hospital site is now well

advanced so it is no longer a potential CSO site.

We still consider that Acton Storm Tanks should be our

preferred site because it is in our ownership and is on the

line of the CSO which means we can directly intercept it.


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Introduction

3

Figure 1A: Acton Storm Tanks location plan

N

Acton StormRelief CSO

WendellPark

Canham Road

ActonStormTanks Cobbo

ldRoad

AlliedWay

GreenendRoad

Stanley

Gardens

CSO discharges into River Thames approximately 1500metres south, adjacent to Chiswick Eyot

Warp

leWay

EALING

HAMMERSMITH &

FULHAM

HOUNSLOW

Local authority boundary

Draft limit of land tobe acquired or used

Proposed tunnelroute centreline

Existing sewer

Factory Quarter

EmlynGardens


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Acton Storm Tanks

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Main tunnel

What we proposed at phase one consultationIn addition to sites to intercept the CSOs, we require sites

to build the main tunnel at:

each end of the main tunnel in west and east London

suitable intervals along the route of the main tunnel

locations where the type of geology that the main

tunnel goes through changes.

Prior to identifying the precise location of the main tunnel

sites, we established the broad areas within which they

would be needed. One of the main tunnel sites is required

in the Hammersmith Bridge area, which is where the main

tunnel would have ended.

At phase one consultation, Hammersmith Pumping

Station was our preferred site in this area to receive

the main tunnel from Barn Elms and drive the long

connection tunnel to Acton Storm Tanks.

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 ourtunnelling strategy, which considers how sites might be

linked together to construct the main tunnel.

Since phase one consultation, a new planning application

for mixed use development has been submitted, covering

the area around the Hammersmith Pumping Station

site. Planning permission is expected to be granted and

construction is likely to start in the near future. The

proposals for mixed use development mean that therewould 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.

We also reviewed our tunnelling strategy and concluded

that the long connection tunnel, which would transfer

flows from Acton Storm Tanks to the main tunnel, needs

to be a similar diameter to the main tunnel. Therefore

we propose to extend the main tunnel to enable a direct

connection to the Acton Storm Relief CSO.

As a result of these changes, the broad search area for

the main tunnel site at the western end of the tunnel has

changed, to the Acton Storm Tanks area.

Given the proposed change of use of Acton Storm Tanks,

in July 2011 we held drop-in sessions for the community

around the site to understand any local issues, should

there be a main tunnel reception site at this location. Wereviewed all the comments we received and took these

into account as part of the site selection process.

What we are proposing at phase two consultation

We have identified four shortlisted sites to receive the

main tunnel from Carnwath Road Riverside, as shown in

Figure 1B. These are:

Commercial units, Stanley Gardens (site 1)

Acton Park Industrial Estate (site 2)

Industrial units, Allied Way (site 3)

Acton Storm Tanks (our preferred site).


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Introduction

5

Figure 1B: Preferred and shortlisted sites

Preferred site Acton Storm Tanks

Other shortlisted site

locations for main tunnel site


N

EALING

HOUNSLOW

Site 1

Site 3

Site 2

HAMMERSMITH &FULHAM


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Acton Storm Tanks

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Related documents:

Changes

Q&A Consultation

Site selection

Carnwath Road Riverside

HammersmithPumping StationHPS

CRR

In considering our tunnelling strategy options, there were

a number of factors we had to take into account. Based

on current information, we concluded that Acton Storm

Tanks would be less suitable as a main tunnel drive site.This was mainly due to the fact that this site is not near

the River Thames, so there would be no opportunity to

use the river to remove excavated material and to deliver

of construction materials to site. It was however judged

suitable as a main tunnel reception site.

Acton Storm Tanks is our preferred site to receive themain tunnel from Carnwath Road Riverside for a number

of reasons. It is brownfield site, it is in our ownership andthe site is large enough to accommodate all the main

works.

Site 1 Commercial Units, Stanley Gardens, Site 2 Acton Park Industrial Estate and Site 3 IndustrialUnits, Allied Way are shortlisted sites. All these sites areless suitable because they would result in both temporary

and permanent loss of employment land and possibly

affect a number of community uses within these areas.We do not own these sites, so we would need to acquire

the land. In terms of tunnelling options, these sites could

be used as main tunnel sites, but we would still need a

site at Acton Storm Tanks to intercept the CSO.


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Construction

7

Section 2: Construction

Construction activitiesConstruction activities are required to intercept the CSO.To enable this, we would demolish the two northernmost

storm tanks and construct an interception chamber within

the storm tank facilities to intercept the CSO flows. A

connection culvert would link the interception chamber

to a drop shaft (approximately 31m deep) through which

flows would pass into the main tunnel.

The drop shaft would receive the tunnel boring machine

from Carnwath Road Riverside, which would be

dismantled and removed from the site. The drop shaft

would also be used to install the secondary lining into

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 and a half

years in total. The main construction activities associated

with these phases are set out in Table 2.1.

Figure 2A: Illustration showing typical elements of below ground infrastructure (existing storm tanks not illustrated for clarity)

Drop shaft

Main tunnel

Valve chamber

Existing sewer

ExistingoverfowtoRiverThames

Interception chamber

Existingoverfowsewer

Connection culvertConstruction


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Advanceworks

Phase 1

Site setup

Figure reference Figure 2C

Typical working hours Varies Standard

Maincons

tructionactivities

Utilities connected

Utilities diverted or protected

Site cleared

Site facilities and access set up

Drop shaft excavated and built

Tunnel boring machine removed from shaft and disassembled

Above and below ground structures constructed

Internal (secondary) tunnel lining 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

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Phase 2

Drop shaft

construction

Phase 3

Construction

of otherstructures

Phase 4

Secondary

lining

Phase 5

Completion of

works and siterestoration

Figure 2C Figure 2D Figure 2D

Standard Standard Continuous Standard

Related documents:

Build

Managing construction


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Acton Storm Tanks

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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:

The construction access arrangements for the site havebeen amended since phase one consultation. Access

would now be located on Canham Road to further

reduce the effects of construction on the residents of

Warple Way.

Since phase one consultation the construction site has

been moved to the northern end of the Acton Storm

Tanks site, which is farthest from nearby residential

properties on Warple Way.

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.

Year 2 Year 3 Year 4

P1

P2

P3

P4 P5

Year 1

Advance

works

Figure 2B: Construction timeline showing approximate

duration of works in phases (P)


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Construction

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Figure 2C: Illustrative phases 1 and 2 construction plan

Drop shaft

Cranes

N

Maximum extent ofconstruction site forphases 1 and 2

Site hoarding


Site support/welfare

Excavated materialstorage and processing

Maintenance workshopand storage

Construction support

Internal site road

Site access

EALING

HOUNSLOW

HAMMERSMITH &FULHAM

Canham

Road

Warp

leWay


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Figure 2D: Illustrative phases 3 and 4 construction plan

Dropshaft

Cranes

Crane

N

Maximum extent ofconstruction site forphases 3 and 4

Site hoarding


Site support/welfare

Maintenance workshopand storage

Construction support

Internal site road

Site access

EALING

HOUNSLOW

Canham

Road

Warp

leWay

HAMMERSMITH &FULHAM


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Construction

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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 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

construction work may have on third party structures. The

studies may recommend particular construction methods or,

in very limited instances, protection works.

Temporary connection to utilities

(such as water, sewer, phone and

electricity supply).

We expect to connect to water, sewer and phone supplies

within the site.

We expect to connect to a electricity supply in Emlyn Road.

This would require minor temporary construction works

within Cobbold 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 intend to use most of the excavated material

to infill two of the existing storm tanks, which would

minimise the number of lorries visiting the 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.

There are two possible site access options for construction

traffic. Construction traffic could access the site from

Old Oak Lane (A400), turn right on to The Vale (A4020)

and left onto the southbound Warple Way, turn right

into Canham Road and turn left into the site via a new

temporary entrance off Canham Road. Alternatively,

construction traffic could access the site from Hanger

Lane (A406), travelling along Uxbridge Road/The Vale

(A4020) and then following the same route to the site

along Warple Way and Canham Road.

Construction traffic would leave the site via the same

entrance and turn left onto Canham Road, before

travelling northbound along Stanley Gardens to the

The Vale (A4020), from which it is possible to use either

Hanger Lane (A406) or Old Oak Lane (A400). These

access routes are shown on Figure 2E. Beyond this,

construction traffic would use the major road network to

get to and from its final destination.

There may be a minor footpath diversion around the

site. We may need to suspend or relocate some on-streetparking bays on Warple Way (north of Canham Road),

Stanley Gardens and Canham Road during construction.

We may also need to make minor modifications to the

kerb line at each end of Canham Road to accommodate

the movement of construction vehicles around these

corners. Based on our current design, we do not anticipate

that any road diversions or bus stop relocations would be

required.

Phase 1

Site setup

Phase 2

Drop shaftconstruction

Phase 3

Constructionof other

structures

Phase 4

Secondarylining

Phase 5

Completion ofworks and site

restoration

Average daily

lorry visits4 lorries 7 lorries 16 lorries 16 lorries 6 lorries

Table 2.3: Average daily lorry visits during the peak months

Related documents:

Transport


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Construction

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A40

A406

A40

M4

A3220

A4020

Uxbridge Road

The Vale

Left turn in, leftturn out

Suspension of

parking

Warple Way

StanleyGardens

Old Oak LaneA400

Canham

Road

EALING

HOUNSLOWRICHMOND UPON

THAMES

BRENT

HAMMERSMITH &FULHAM

KENSINGTON &CHELSEA

Draft limit of land tobe acquired or used

Internal site road

Site access


Transport for London(TfL) road network

Proposed lorry access toTfL road network

N

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

A t St T k


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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 of

construction vehicles

on the capacity and

operation of the local

road network.

We are investigating opportunities to maximise the use of excavated material from

the tunnel to fill up the northernmost storm tanks, and as part of the permanent site

landscaping. This would reduce the volume of construction traffic.

We have also 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.

Temporary suspension orrelocation of some on-

street parking on Canham

Road, Warple Way and

Stanley Gardens.

Use of the existing one way traffic system around the site would minimise the need to

relocate/replace existing areas of off street car parking. We are investigating options for

temporary relocation/replacement parking provision during construction where necessary.

Possible effect of

noise and vibration on

neighbouring areas.

Since phase one consultation, the main tunnel construction site has been moved to

the northern end of the site, which is furthest from the majority of nearby residential

properties. The contractor would be required to implement noise and vibration control

measures at the worksite, which will be set out in the CoCP. Continuous working would onlybe undertaken for a short period of time to carry out tunnel lining.

Possible effects on local

air quality and dust

nuisance in neighbouring

areas.

Since phase one consultation, the main tunnel construction site has been moved to

the northern end of the site, which is furthest from the majority of nearby residential

properties. 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

Acton Storm Tanks


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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 Acton Storm Tanks. The design of the

permanent proposals follows our scheme-wide principlesand takes into account comments made and ongoing

engagement with the London Boroughs of Ealing

and 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 main tunnel shaft with an internal diameter

of approximately 15m, connection culvert, interception

chamber and valve chamber.

A ventilation building containing fans, filters and

electrical and control equipment.

Three ventilation columns enclosed within a single

structure up to 15m high.

Maintenance vehicle access off Canham Road

Works to structures associated with the existing storm

tanks, including: modifications to existing weir overflow

chamber, a new pipe overflow and overflow connection

chamber.New pipework which will enable flows to bypass Acton

Storm Tanks, significantly reducing odours which

currently arise from the site.

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

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Issue Our response

The existing storm tanks.

The two northernmost tanks would be decommissioned and filled in. This is because the

main tunnel reception shaft would be located here.

The four remaining tanks would be isolated and flows transferred to the main tunnel

during CSO spills therefore reducing odours.

Effect of permanent works

on residential amenity.

Since phase one consultation, the main tunnel site has been relocated to the northern

end of the site, which is farthest from the majority of nearby residential properties.

Visual effect of the

permanent works.

The ventilation building and structure are being designed to respect their existing

industrial context and built form, with the possible use of brick and sloping roofs, andsetting the building back from Canham Road. We are considering adding interest to the

design by revealing the ventilation equipment using a glass wall.

The ventilation structure would accommodate all three ventilation stacks and is located

west of the building to minimise its effect on its surroundings.

Narrowness of public

footpaths in Canham Road.

It is proposed to widen the existing footpath on the south side of Canham Road

to accommodate normal use and to offer better access to the nearby crche and

residential areas.

New site access.

Two new vehicle accesses from Canham Road are proposed for access to the building

and ventilation structure. The accesses would be set back from the existing road edge

and link into the existing one way system. These accesses would be used infrequently

for maintenance purposes only. The main site access would remain unchanged.

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

Acton Storm Tanks


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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

Acton Storm Tanks


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Acton Storm Tanks

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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

Secondary accessfor maintenance of

ventilation column

Ventilation columnVentilationbuilding

Existingfootpath tobe widened

Northern two storm tanksfilled with excavated materialfrom shaft construction

Building set backfrom boundary by

approximately 5m

New fencing tomatch existing

Secondary accessfor maintenancevehicles

New line ofboundaryfencing

Replacement fencingto be provided

Main access toActon Storm Tanks

Canham

Road

N

Grassedarea

Hardstandingarea

Area to bereinstated followingconstruction works

Existingcar parking

Modificationsto above groundchamber

Remaining stormtanks to be takenout of use

Acton Storm Tanks


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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 would 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 and inspection vehicle

into the shaft. This is likely to take several weeks, and

would all be undertaken within our site.

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 the existing

access gates in Warple Way, with only major maintenanceworks accessing the site from Canham 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 developed anAir management plan to minimise possible odour and air quality effects arising from theoperation of the tunnel. The technology we are proposing to use at this site includes a

mechanical ventilation system that draws air through the tunnel with fans before cleaning

the air using carbon filters that will absorb possible odour before air leaves the ventilation

equipment.

As part of the proposed works, two of the existing storm tanks would be decommissioned

and filled in. This would reduce existing odour problems. We are also proposing to isolate

the remaining four tanks, so they would no longer be required. This would be achieved byconstructing new pipe work along the western perimeter of the site.

Disturbance from future

maintenance access.

The permanent access to our site would remain unchanged and visits would be

undertaken as part of the existing maintenance routine. As detailed in Table 3.1 two

additional access points would be made available to ease access from Canham Road.

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.

Carnwath Road Riverside

Hammersmith Pumping StationHPS

CRR

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 7 of the non-technical summary

and volume 7 of the PEIR for more information on this site.

Phase two schemedevelopment

Design development

report

Provides a general overview of how the scheme design at

each site has evolved to date. Please refer to chapter 4 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 A for more information on this site.

Site glossary


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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.

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.

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 wouldbe 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.

Secondary lining A second, internal lining to the tunnel, giving it additional strength.

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.

Tunnel boring machine

(TBM)

A machine used to excavate tunnels through a variety of conditions, with a circular

cross-section.


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Acton Storm Tanks


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Phase two consultation: Acton Storm Tanks

For further information or to comment on our

proposals see our website:

www.thamestunnelconsultation.co.uk

110-ED-PNC-00000-000068

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.

P2 Acton SIP

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