p2 albert embankment sip
TRANSCRIPT
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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
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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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Albert Embankment Foreshore
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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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Albert Embankment Foreshore
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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
7
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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Albert Embankment Foreshore
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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
9
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
Thames Pathdiversion
VauxhallBridge
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Albert Embankment Foreshore
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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
Thames Pathdiversion
Maximum extent ofconstruction site forphases 2 and 3
Site hoarding
Cofferdam
Local authorityboundary
Site support/welfare
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
11
Figure 2E: Illustrative phase 4 construction plan
Option for contractorto transport materialsusing barges
Crane
Crane
Crane
N
CITY OFWESTMINSTER
LAMBETH
Thames Pathdiversion
Maximum extentof construction sitefor phase 4
Site hoarding
Cofferdam
Local authorityboundary
Site support/welfare
Excavated materialstorage andprocessing
Maintenanceworkshop and storage
Internal site road
Site access
Existing Thames Path
Thames Path diversion
Drop shaft
VauxhallBridge
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Albert Embankment Foreshore
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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
13
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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Albert Embankment Foreshore
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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
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.
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
Albert Embankment Foreshore
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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
Albert Embankment Foreshore
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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
21
Figure 3B: Artists impression of the site after the works are completed (north of Vauxhall Bridge)
Albert Embankment Foreshore
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Albert Embankment Foreshore
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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)
Albert Embankment Foreshore
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Albert Embankment Foreshore
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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)
Albert Embankment Foreshore
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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.
Albert Embankment Foreshore
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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.