P2 Albert Embankment SIP

8/3/2019 P2 Albert Embankment SIP

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Introd

uction

Introd

uction

Thames Tunnel

Siteinformationpaper

1

Albert EmbankmentForeshore

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. The

sewage 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 Albert Embankment Foreshore.

Key facts

Local authority: LambethCSO names: Clapham Storm Relief and Brixton Storm Relief

CSO spill volume in an average year: 280,000m (equivalent to approximately

112 Olympic swimming pools)

Site type: CSO site

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


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Albert Embankment Foreshore

2

We are proposing to use the foreshore of the River

Thames adjacent to Albert Embankment (A3036) 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 CSOs, known

as the Clapham Storm Relief CSO and Brixton Storm

Relief CSO to the main tunnel.

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

site extends into the foreshore of the River Thames

from Tintagel House to south of Vauxhall Bridge. The

Thames Path runs through the site, and within the site

is the slipway from Albert Embankment (A3036) to

the River Thames (known as Lacks Dock). To the east

of the site are office buildings (Camelford House and

Tintagel House) and the MI6/SIS building. To the north

east is Albert Embankment Gardens and Peninsula

Heights apartment block. To the south, beyond Grade

II* listed Vauxhall Bridge, is St Georges Wharf, a mainlyresidential development which also includes offices, shops

and restaurants. The site is located within the Albert

Embankment Conservation Area.

Section 1: Introduction and site information

Related documents:

Build

This site information paper sets out our proposals at

Albert Embankment Foreshore. We have also producedproject information papers, which cover overarching

topics relating to the project. Where we consider that a

project information paper is particularly relevant, we have

highlighted this in a related documents box. At the end

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

which may be of interest and a glossary of terms.


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Introduction

3

Figure 1A: Albert Embankment Foreshore location plan

VauxhallBridge

Brixton StormRelief CSO

Clapham StormRelief CSOG

rosven

orRoad

Millb

ank

Alb

er

tE

mb

an

kme

nt

N

MI6/SIS

SpringGardens

VauxhallStation

St. GeorgeWharf

CITY OF WESTMINSTER

WANDSWORTH

LAMBETH

Local authority boundary

Draft limit of land to beacquired or used

Proposed tunnelroute centreline

Existing sewer

Existing CSO

Peninsula Heights

AlbertEmbankment

Gardens

Tintagel House

Camelford House

Lacks Dock


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4

How we chose this site

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

possible shortlisted sites to intercept the Clapham Storm

Relief CSO and Brixton Storm Relief CSO. At phase one

consultation, which was held between September 2010

and January 2011, we presented these sites:

Foreshore, adjacent to MI6/SIS Building and

Vauxhall Bridge

Foreshore, adjacent to St. Georges Wharf and

Vauxhall Bridge

Open space, Claylands Road only intercepts

Clapham Storm Relief CSO

Albert Embankment Foreshore.

Albert Embankment Foreshore was identified as our

preferred site at phase one consultation.

What we are proposing at phase two consultationWe have considered the comments from phase one

consultation, feedback from ongoing engagement and

new information; and undertaken further technical work.

We still consider that Albert Embankment Foreshore is

our preferred site because it would allow the interceptionof both CSOs at one site rather than having two separate

sites; and would have less effects than the other

shortlisted sites.

Related documents:

Q&A Consultation

Site selection


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Construction

Construction

5

Section 2: Construction

Construction activitiesConstruction activities are required to intercept theCSOs. We would construct interception chambers to

intercept the CSOs. Connection culverts would link the

interception chambers to a drop shaft (approximately

47m deep), through which flows would pass down to

a short connection tunnel. This would then join to the

main tunnel.

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

Figure 2A illustrates the below ground infrastructure

proposed. As the construction works would take place

within the foreshore of the River Thames, permanent

structures extending into the foreshore are required.

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.

Main tunnel

Drop shaft

Valve chamberShort connection tunnel

Existingoverfowsto River Thames

Interceptionchambers

Existingoverfowsewer Brixton Storm Relief

Connection culvert

Existingoverfowsewer

ClaphamStorm Relief


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6

Advance works

Phase 1

Site setup

Figure reference Figure 2C

Typical working hours Varies Standard

Mainconstructionactivities

Utilities connected

Site cleared Temporary works in the River Thames constructed

Site facilities and access set up

Drop shaft excavated and built

Tunnel boring machine delivered to site and assembled

Short connection tunnel excavated and built

Above and below ground structures constructed

Mechanical and electrical equipment installed

Temporary works in the River Thames removed

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 shaftconstruction

Phase 3

Tunnelling

Phase 4

Construction ofother structures

Phase 5

Completion ofworks and site

restoration

Figure 2D Figure 2D Figure 2E

Standard Continuous Standard Standard

Related documents:

Build

Managing construction


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Site layout and construction phasesFigures 2C, 2D and 2E 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, 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 access route to the site has been amended sincephase one consultation. The proposed access during

phase one consultation was along the foreshore using

Albert Embankment Gardens to gain access from the

road. We are now proposing to access the site via a

temporary road parallel to Lacks Dock. This eliminates

the potential effect on Albert Embankment Gardens,

the listed embankment wall and reduces the potential

effects on nearby residential properties at

Peninsula Heights.

Figure 2B: Construction timeline showing approximate

duration of works in phases (P)

P1

P2

P3

P4

P5

Year 1

Advance

works

Year 2 Year 3 Year 4

The change in access arrangements reduces the extent

of the temporary works required in the foreshore of theRiver Thames.

The site layouts are indicative only, and the contractor

may arrange the site in a different way, depending on

the chosen construction methods, provided that any

environmental effects are appropriately managed, and

that the main construction activities are undertaken

within the red line shown in Figure 1A.


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Construction

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Figure 2C: Illustrative phase 1 construction plan

Jack up bargeservicing pilingoperations

Barges

CITY OFWESTMINSTER

LAMBETH

N

Thames Pathdiversion

Maximum extentof construction sitefor phase 1

Site hoarding

Cofferdam

Local authorityboundary

Site support/welfare

Internal site road

Site access

ExistingThames Path


VauxhallBridge


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Figure 2D: Illustrative phases 2 and 3 construction plan

Option for contractorto transport materialsusing barges

Piling rig

Crane

Crane

Drop shaft

N

CITY OFWESTMINSTER

LAMBETH


Maximum extent ofconstruction site forphases 2 and 3

Site hoarding

Cofferdam



Excavated materialstorage and processing

Maintenanceworkshop and storage

Construction support

Internal site road

Site access

Existing Thames Path

Thames Path diversion

VauxhallBridge


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Construction

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Figure 2E: Illustrative phase 4 construction plan

Option for contractorto transport materialsusing barges

Crane

Crane

Crane

N

CITY OFWESTMINSTER

LAMBETH


Maximum extentof construction sitefor phase 4

Site hoarding

Cofferdam



Excavated materialstorage andprocessing

Maintenanceworkshop and storage

Internal site road

Site access

Existing Thames Path

Thames Path diversion

Drop shaft

VauxhallBridge


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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 for

construction

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 utilities in Albert Embankment

(A3036).

Dredging.

There is a possibility that as the detailed design is

developed we may need to undertake dredging to allow

barges to get to and from our site.

Protection of the river bed.

We may need to carry out works to strengthen the river

bed to avoid scour.

Construction of a lorry holding area.

Due to particular requirements at this site, an off-site

vehicle marshalling facility would be used to regulate

construction vehicles entering the site. We anticipate

that this holding area would be within a 10-15 minute

drive from the site.

Required for

operational

phase

Permanent connection to utilities (such

as water, phone and power supply) for the

operational tunnel.

We expect to connect to utilities in Albert Embankment

(A3036).

Table 2.2: Additional works and activities


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Construction

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Construction transport and accessWe propose to use barges to bring in and take away the

material used to fill the cofferdam. It is not generallypractical and cost effective to transport all materials

to and from the site by barge so we would still need to

transport some materials by road. We would however

give the contractor the flexibility to determine the most

practical and cost-effective means of transporting other

materials and equipment.

Each barge would remove approximately 20 lorries from

the road. Using barges at this site would reduce thenumber of lorry visits to/from this site by approximately

50% (saving 9,000 lorry visits over the construction

period of approximately three and a half years). Table 2.3

sets out the anticipated average daily number of lorries

and barges visiting (ie travelling to and from) the site

during the peak months of each phase, based on moving

cofferdam fill material by barge.

Construction traffic would access the site by travellingnorth along Albert Embankment (A3036) and turning left

into a new entrance adjacent to the Lacks Dock access.

This access would allow London Duck Tours amphibious

vehicles to continue using Lacks Dock. Traffic would leave

the site by turning left onto Albert Embankment from

the same entrance. These access arrangements have

changed since phase one consultation where access was

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 visits29 lorries 24 lorries 4 lorries 21 lorries 11 lorries

Average daily

barge visits 7 barges none none none 2 barges

Table 2.3: Average daily lorry and barge visits during the peak months

proposed through Albert Embankment Gardens. The new

access route avoids Albert Embankment Gardens andis shown on Figure 2F. Beyond this, construction traffic

would use the major road network to get to and from its

final destination.

The Thames Path runs across our site, including the

location of our proposed access. We would create a

temporary diversion for the duration of our works, as

indicated on Figures 2C, 2D and 2E. Based on our current

design we do not anticipate that any other footpathor road diversions, parking bay suspensions, bus stop

relocations or junction changes would be required.

As the site is close to the MI6/SIS building, an off-site

vehicle marshalling facility would be used for security

screening and to regulate construction vehicles entering

the site. We anticipate that this holding area would be

within a 10-15 minute drive from the site.

Related documents:

Transport


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A202

A3036

VauxhallBridge

Left turn in,left turn out

Lacks Dockaccess

AlbertEmbankment

Millb

ank

N

Alb

ert

Em

ban

kmen

t

CITY OFWESTMINSTER

LAMBETH

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

WANDSWORTH

Draft limit of land tobe acquired or used

Internal site road

Site access

Local authority boundary

Transport for London(TfL) road network


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Construction

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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.

Alb t E b k t F h


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Issue Our response

Possible presence of

significant prehistoric

(Mesolithic and Bronze

Age) archaeological

remains in the foreshore

of the River Thames.

As part of the Environmental Impact Assessment, we would undertake a preliminary

site-based archaeological assessment, which would enable a more targeted and precise

strategy to address potential effects to be developed for the site post-consent and

in advance of construction. Further work, which is likely to comprise archaeological

excavation and recording, would be carried out in accordance with a scope of works

(Written Scheme of Investigation), which would be agreed with English Heritage,

London Borough of Lambeth and other key stakeholders prior to the commencement of

construction.

Possible effect of

foreshore construction

activities on river

navigation and river users,

including London Duck

Tours who operate from

Lacks Dock.

We would manage our works in order to maintain safe access for London Duck Toursduring construction. This includes construction of a separate access road to our site and

management of the shared access onto Albert Embankment (A3036) through the traffic

management plan.

We have undertaken modelling to test the effect that the structure has on the flow of the

river. The modelling has shown the proposed structure to be satisfactory and the Port of

London Authority and other key stakeholders are satisfied the permanent works have a

minimum effect on river navigation. A full navigational risk assessment will be undertaken

for the temporary and permanent works.

Temporary diversion of

the Thames Path.

The Thames Path would be temporarily diverted via a safe alternative route to the east of

the construction site, along Albert Embankment (A3036).

Possible effect of

noise and vibration on

neighbouring areas.

Since phase one consultation, we have relocated the construction site access via Lacks

Dock to reduce effects on the nearest 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 tunnelling would only be undertaken for a short period of time to construct aconnection 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.


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Construction

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Issue Our response

Possible effects on

foreshore habitat and river

wildlife.

Since phase one consultation, we have reduced the extent of temporary works in the

foreshore of the River Thames by relocating the construction site access via Lacks Dock.Ecological surveys of the River Thames and foreshore are being undertaken to identify

possible effects arising from construction activities. 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.

Possible effects of

construction activities on

adjacent structures, which

may cause settlement.

We will undertake a detailed assessment of potential ground movement caused by our

construction works and ensure that there is no damage to any structures located close to

our works.

Possible effects on river

and tidal flow, causing

erosion.

We will undertake detailed river scour assessments once river bed samples have been

taken. The foreshore and river structures would be monitored before construction starts

and throughout the construction period.

Table 2.4: Key issues relating to construction

Related documents:

Managing construction



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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 Albert Embankment Foreshore. The design

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

and ongoing engagement with the London Borough of

Lambeth and other technical consultees.

Our permanent works, which are formed within a structure

extending into the foreshore of the River Thames, need

to incorporate functional elements which are required for

the operation of the main tunnel. These include:

Underground structures with ground level access covers

including: a CSO drop shaft with an internal diameter

of approximately 16m, connection tunnel to the main

tunnel, connection culvert, interception chamber, valve

chamber and a passive filter chamber.

Two main ventilation columns up to 6m high.

Two small diameter ventilation columns to the

interception chamber up to 6m high.

Maintenance vehicle access.

An electrical and control kiosk.

A pipe laid within the foreshore of the River Thames

to connect the Clapham Storm Relief CSO to theinterception chamber for the Brixton Storm Relief CSO.

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

Effects on river navigation

and hydraulics.

Preliminary modelling has indicated that the proposed design is acceptable in terms of

flow and scour of the river. A more detailed investigation is underway.

The proposals have been discussed with the Port of London Authority and other key

stakeholders to develop a layout that has a minimal effect on river navigation.

Loss of foreshore habitatand effects on ecology.

Since phase one consultation, the drop shaft has increased in diameter as a result of

detailed modelling. Our proposals for the permanent layout and design of the site have

however sought to reduce the extent of the permanent works within the foreshore of the

River Thames to minimise effects on water ecology as far as possible. Ecological surveys

of the River Thames and foreshore are being undertaken to identify possible effects, anddesign measures would be incorporated where required.

Construction of the tunnel would deliver river-wide improvements to local water quality,

which would result in positive effects on river ecology, including habitat improvements

and reduced fish kills.

Effect on the setting of the

Grade II* listed VauxhallBridge, and historic views

along the River Thames.

We have taken a contemporary approach to the design of the proposed structure

adjacent to Vauxhall Bridge. We consider this design takes its reference from the

monumental architecture of the MI6/SIS building (circular turrets and clean detailing)

and would not detract from the setting of the Grade II* listed Vauxhall Bridge.

The design of the above ground structure has sought to reduce the bulk of the

permanent extension to the embankment and to minimise the potential effects on

views of Vauxhall Bridge.

Effect on the Thames Path.

The Thames Path would be restored after our works are complete and would be

enhanced with a new landscaped public area where people can enjoy the views along

the River Thames.

Visual effect of the

permanent works.

The ventilation columns, in common with the scheme-wide ventilation strategy, are

thinner and shorter than proposed at phase one consultation.

We require two operational electrical and control kiosks at ground level and these would

be designed to be unobtrusive with one located beneath Vauxhall Bridge and the other

on the back edge of the proposed new public area in front of Camelford House.

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



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Related documents:

Design

Figures 3A, 3B, 3C, 3D, 3E, 3F and 3G 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.

Figure 3A: Photo of the site before the works (north of Vauxhall Bridge)

Future use


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Future use

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Figure 3B: Artists impression of the site after the works are completed (north of Vauxhall Bridge)



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Figure 3C: Photo of the site before the works (south of Vauxhall Bridge)

Future use


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Figure 3D: Artists impression of the site after the works are completed (south of Vauxhall Bridge)



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Figure 3E: Aerial view of the completed works (north of Vauxhall Bridge)

Future use


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Figure 3F: Aerial view of the completed works (south of Vauxhall Bridge)



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be t ba e t o es o e

26

Figure 3G: Layout of the site once construction works are complete

Timber seating

New Clapham Storm Relief andBrixton Storm Relief CSO outlets

Display case forpossible archaeologicalfinds set into ground

Alb

ert

Emb

ankm

ent

Open balustrade towardscentral London views

WidenedThames Path

Maintenance vehicle access viaexisting Lacks Dock accessway

Foreshore interception structurefor Clapham Storm Relief CSO

N

Vauxhall Bridgedeck omittedfor clarity

Floodable terraces overClapham Storm ReliefCSO connection pipe

Electrical and controlkiosk beneathVauxhall Bridge

Ventilation columns

Timber seating

Ventilation columns

Electrical and control kiosk

Future use


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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 approximatelyonce 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 twomobile 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 Lacks Dock.

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. Table3.2 summarises these issues and how we are currently

proposing to address them.

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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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.

Q&A ConsultationSets 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 this

consultation.

Design

Contains the design principles which have influenced the permanent appearance of

our sites once construction work is complete.

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

of the Thames Tunnel project.

Managing

construction

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

during construction.

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

Options Outlines the various ways to deal with sewage overflows.


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Phase two public consultation material

Icon Title Details

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

problem.

Route and

tunnel

alignment

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

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

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

Further information


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Technical reports

Theme Icon Title Details

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 19 of the non-technical

summary and volume 19 of the PEIR for more informationon 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 16 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 N for more information on this site.

Site glossary


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Term Definition

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

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

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

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

Combined sewer

overflow (CSO)

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

are full as a result of increased rainfall. Without the 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 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.

Scour Movement of the riverbed materials due to the force of the water.

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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Phase two consultation: Albert Embankment Foreshore

For further information or to comment on our

proposals see our website:

www.thamestunnelconsultation.co.uk

110-ED-PNC-00000-000069

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.

Documents

P2 Albert Embankment SIP