p2 falconbrook ps sip
TRANSCRIPT
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Introd
uction
Introd
uction
FalconbrookPumping Station
Currently, untreated sewage regularly overows into the River Thames from Londons Victorian sewerage systemvia combined sewer overows (CSOs). The proposed Thames Tunnel would intercept these overows through theuse of a new storage and transfer tunnel, which would link west London and Abbey Mills Pumping Station. Thesewage ow would then be transferred to Beckton Sewage Treatment Works via the Lee Tunnel. The reductionin untreated sewage entering the River Thames would bring long-term benets for the environment and users 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 Falconbrook Pumping Station.
Thames Tunnel
Siteinformationpaper
1
Alternative to Bridges Court Car Park
Key facts
Local authority: Wandsworth
CSO name: Falconbrook Pumping StationCSO spill volume in an average year: 710,000m (equivalent to approximately
284 Olympic swimming pools)
Site type: CSO site
Duration of main construction works: Approximately three years.
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Falconbrook Pumping Station
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We are proposing to use our existing pumping station
and adjacent disused toilet block for this constructionwork and to accommodate permanent structures required
to operate the main tunnel. The site would be used to
connect the existing local CSO, known as the Falconbrook
Pumping Station CSO, to the main tunnel.
The location of the site is shown in Figure 1A. York
Gardens, a local park is adjacent to the site, beyond
which, to the east, is the Winstanley Estate. York Gardens
Library and Community Centre are to the south with YorkGardens Adventure Playground, which incorporates the
One Oclock Club, to the north. To the west is York Road
(A3205).
Section 1: Introduction and site information
Related documents:
Build
This site information paper sets out our proposals at
Falconbrook Pumping Station. 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: Falconbrook Pumping Station location plan
FalconbrookPumpingStation CSO
FalconbrookPumping Station
York Road CommunityCentre/Library
Ploug
hRoad
Brid
ges
Court
York
Gardens
Winstanley EstateLavenderRoad
Newcome
nR
oad
York GardensAdventure Playground
N
WANDSWORTH
HAMMERSMITH &FULHAM
York
Roa
d Local authority boundary
Draft limit of land tobe acquired or used
Proposed tunnelroute centreline
Existing sewer
Existing CSO
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Falconbrook Pumping Station
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How we chose this site
What we proposed at phase one consultationAt phase one consultation, which was held between
September 2010 and January 2011, Bridges Court Car
Park was presented as our preferred site to intercept the
Falconbrook Pumping Station CSO.
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 has resulted in us re-assessing
potential sites to intercept the Falconbrook Pumping
Station CSO.
We identified one potential new site, Falconbrook
Pumping Station, which includes our existing pumping
station and the adjacent disused toilet block off York
Road (A3205). Prior to phase one consultation, the
disused toilet block was identified as part of the site
selection process but was considered to be too small on
its own, so we did not progress this site any further.
We also examined the pumping station site on its own
and based on early design work and consideration of the
technical issues identified; we were not able to confirm it
was technically viable. This site was not progressed any
further. Since January 2011, further technical work has
concluded that the pumping station site combined with
the disused toilet block is feasible, although it would still
present technical challenges to intercept the CSO.
Given the identification of this potential new site, in
June 2011, we held drop-in sessions with the community
around the site to understand any local issues they may
have, should there be a site at this location. We reviewed
all the comments we received and took these into
account as part of the site selection process.
What we are proposing at phase two consultationWe have identified five shortlisted sites to intercept the
CSO, as shown in Figure 1B. The sites are:
Foreshore near London Heliport, Lombard Road (site 1)
Bridges Court Car Park (site 2)
York Gardens, adjacent to York Road (site 3)
York Gardens, adjacent to Pennethorne House (site 4)
Falconbrook Pumping Station (our preferred site).
Falconbrook Pumping Station is our preferred site tointercept Falconbrook Pumping Station CSO because it
would cause less disruption to the wider local community
in comparison to the other shortlisted sites and would
potentially provide an improved public space after our
works are complete. We also own most of the site unlike
Bridges Court Car Park.
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Introduction
5
Figure 1B: Preferred and shortlisted sites
Site 1
Site 2Site 3
Site 4
N
YorkGardens
YorkR
oad
WANDSWORTH
Preferred site FalconbrookPumping Station
Other shortlisted sitelocations
Local authority boundary
Brid
ges
Court
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Falconbrook Pumping Station
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Site 1 Foreshore near London Heliport, Lombard Roadis a shortlisted site because it is considered that it is less
suitable than our preferred site. The site could affect
residential amenity as it is adjacent to, and overlookedby, a new multi-storey residential apartment block. Road
access is limited to a narrow route, which passes the
recent residential development. The primary construction
and operational access would therefore have to be via
the River Thames and, due to the requirement for a
cofferdam to protect the works from the River Thames
and river-based access, the foreshore site would also take
longer to construct.
Site 2 Bridges Court Car Park is a shortlisted sitebecause compared to our preferred site, it is judged to
have greater potential effects on residential and business
amenity. The site has also been identified for residential
use in the councils planning policies. In addition, a
planning application for a residential scheme has been
submitted on this site.
Site 3 York Gardens, adjacent to York Road is ashortlisted site. It is considered less suitable than our
preferred site due to the loss of a play area and public
open space. Use of this site would also require the cutting
down of mature trees, which provide the childrens centre
with screening from York Road (A3205).
Site 4 York Gardens, adjacent to Pennethorne House is a shortlisted site. Use of this site would result in the
temporary loss of the public open space in York Gardensand construction activities would be in close proximity to
the apartment block, Pennethorne House. The site would
also likely require access through a number of narrow
residential roads. It is therefore considered less suitable
than our preferred site.
Related documents:
Changes
Q&A Consultation
Site selection
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Construction
Construction
7
Section 2: Construction
Construction activitiesConstruction activities are required to intercept the
CSO. We would construct an interception chamber to
intercept the CSO. A connection culvert would link the
interception chamber to a drop shaft (approximately
40m deep) through which flows would pass down to
a short connection tunnel. This would then join to the
main tunnel. Figure 2A illustrates the below ground
infrastructure proposed.
Figure 2A: Illustration showing typical elements of below ground infrastructure
Main tunnel
Drop shaft
Short connectiontunnel
Valve chamber
To pumping station,to River Thames
Interception
chamber
Existing sewer
Connection culvert
These activities would take place within the area
indicated by the red line in Figure 1A, in five main phases,
lasting approximately three years in total. The main
construction activities associated with these phases are
set out in Table 2.1.
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Advance works
Phase 1
Site setup
Figure reference Figure 2C
Typical working hours Varies Standard
Mainco
nstructionactivities
Utilities connected
Utilities diverted or protected
Site cleared
Site facilities and access set up
Drop shaft excavated and built
Short connection tunnel excavated and built
Above and below ground structures constructedMechanical 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
9
Phase 2
Drop shaft
construction
Phase 3
Tunnelling
Phase 4
Construction of
other structures
Phase 5
Completion of
works and siterestoration
Figure 2C Figure 2C Figure 2D
Standard Continuous Standard Standard
Related documents:
Build
Managing construction
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Falconbrook Pumping Station
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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 size of the construction site required has beenreduced to limit the effect on the adjacent York Garden
Library and Community Centre and York Gardens
Adventure Playground.
The size of the construction site has been reduced to
utilise land in our ownership as much as possible.
Construction site access is proposed off York Road
(A3205) to reduce the effects on adjacent residential
properties in the Winstanley estate.
The site layout has been arranged so that access to the
York Garden Library and Community Centre and YorkGardens Adventure Playground would be maintained
during construction.
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.
P1
P2
P3
P4
P5Advance
works
Year 1 Year 2 Year 3
Figure 2B: Construction timeline showing approximate
duration of works in phases (P)
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Construction
11
Figure 2C: Illustrative phases 1, 2 and 3 construction plan
Cranes
Drop shaft
N
WANDSWORTHMaximum extent ofconstruction site for
phases 1, 2 and 3Site hoarding
Site support/welfare
Excavated materialstorage and processing
Maintenance workshopand storage
Construction support
Internal site road
Site access
Existing footpathto be diverted
Footpath diversion
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Figure 2D: Illustrative phase 4 construction plan
Cranes
Dropshaft
Piling rig
N
WANDSWORTHMaximum extent ofconstruction site for
phase 4Site hoarding
Site support/welfare
Maintenance workshopand storage
Internal site road
Site accessExisting footpathto be diverted
Footpath diversion
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Construction
13
Additional works and activitiesThe main construction works 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 matterssuch as noise, vibration and dust.
The locations of monitoring equipment would be agreed with thelocal 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.
If protection works are required to the existing sewer, we would
access the sewer network through existing manholes.
Diversion of utilities.If utility diversions are required, we would work with utility
providers to undertake the necessary works.
Temporary connection to utilities
(such as water, sewer, phone and
electricity supply).
If we are unable to make a connection to utilities within the site,
we would need to make a connection to utilities in York Road
(A3205) or Newcomen Road.
Traffic management works.These may need to extend beyond our site and could includerelocating 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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Falconbrook Pumping Station
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Construction transport and access
We would transport materials to and from the site by
road. Table 2.3 sets out the anticipated average dailynumber of lorries visiting (ie travelling to and from) the
site during the peak months of each phase.
Construction traffic would access the site travelling south
along York Road (A3205) and turning left into the site via
a new entrance off York Road (A3205). A second entrance
would be constructed to enable vehicles to exit the site
by turning left onto York Road (A3205). The two new
vehicle entrances would be for the construction periodonly and would be removed once work is complete. It is
not proposed that significant numbers of construction
vehicles would access the site via residential roads located
to the east. This access route is shown on Figure 2E.
Beyond this, construction traffic would use the major road
network to get to and from its final destination.
We would need to temporarily relocate the bus stop
on York Road (A3205) during construction. This wouldbe returned to its current position after construction is
completed. In addition there would be a short diversion
of the footpath between York Road (A3205) and York
Gardens Playground, as shown on Figures 2C and 2D.
Based on our current design, we do not anticipate that
any road diversions or parking bay suspensions would
be required.
Phase 1Site setup
Phase 2Drop shaft
construction
Phase 3Tunnelling
Phase 4Construction
of otherstructures
Phase 5Completion ofworks and site
restoration
Typical
daily lorry
movements
6 lorries 9 lorries 10 lorries 6 lorries 6 lorries
Table 2.3: Average daily lorry visits during the peak months
Related documents:
Transport
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Construction
15
Figure 2E: Proposed access route to the site from the nearest major road
Left turn in
A3205
York Road
Left turn out
YorkR
oad
N
WANDSWORTH
HAMMERSMITH &FULHAM
Draft limit of land tobe acquired or used
Internal site road
Site access
Local authority boundary
Transport for London(TfL) road network
F l b k P i St ti
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Management of construction worksOur construction works would be managed in accordance
with an agreed Code of construction practice (CoCP).For phase two consultation, we have produced a draft
CoCP Part A: General requirements, informed by CoCPsfrom other major construction projects in London and
consultation with the local authorities. Through the
environmental impact assessment process, scheme-
wide principles to address potential effects on the local
environment have been identified and integrated into
the design. The CoCP Part A sets out scheme-wide control
measures that would be used to minimise potentialeffects during the construction process.
Table 2.4 sets out what we consider to be the key issues
for this site during construction, and how we are currently
proposing to address them.
Related documents:
Environment
Managing construction
Transport
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Construction
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Issue Our response
Effect of construction activities on the
recreational enjoyment and use of YorkGardens and other local amenities,
including York Gardens Adventure
Playground and York Garden Library and
Community Centre.
We would manage the construction site in order to minimise disruption to
those using the Gardens and other local amenities. Specific measures would
be set out in the CoCP.
Construction activities may affect vehicle
access and parking at York Garden
Library and Community Centre.
We are working with the London Borough of Wandsworth to ensure that
the York Garden Library and Community Centre can continue to be served
by vehicles as required, and that necessary parking is accommodated
possibly by temporary modifications to York Gardens.
The location of site access onto York
Road (A3205) may disrupt vehicle flows
along York Road (A3205) and the wider
operation and capacity of the local road
network.
We have sought to minimise disruption to the local road network through
our site layout and design. In particular, site access from York Road (A3205)
would minimise the effect on adjacent residential roads. 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.
Reduced pedestrian access into and
through York Gardens via the existing
footpath to the north of the York Garden
Library and Community Centre.
We would provide a suitable temporary footpath diversion around the
construction site.
Construction activities would require the
temporary relocation of the adjacent bus
stop on York Road (A3205).
The bus stop would be relocated further north along York Road (A3205) to
avoid any potential conflict with construction vehicles entering and leaving
the site. Following completion of construction works, it would be reinstated
in its current location.
Possible effect of noise and vibration on
neighbouring areas.
The contractor would be required to implement noise and vibration controlmeasures at the worksite, which will be set out in the CoCP. Continuous
tunnelling would only be undertaken for a short period of time to construct
a connection tunnel from the drop shaft to the main tunnel.
Possible effects on local air quality and
dust nuisance in neighbouring areas.
Preliminary findings indicate that while there is the potential for dust
nuisance effects, there are unlikely to be any significant local air quality
effects at any of the sites. The contractor would put in place air and dust
control measures at the worksite, which will be set out in the CoCP.
Table 2.4: Key issues relating to construction
Falconbrook P mping Station
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Section 3: Future use
This section describes the site after the completion of the
construction work, ie when the main tunnel is in use the
operational phase.
Design
The design of the permanent use and appearance of the
structures at Falconbrook Pumping Station follows our
scheme-wide principles and takes into account comments
raised during ongoing engagement with the LondonBorough of Wandsworth and other technical consultees.
Our permanent works need to incorporate functional
elements, which are required for the operation of the
tunnel. These include:
Underground structures with ground level access covers
including: a CSO drop shaft with an internal diameter
of approximately 9m, connection tunnel to the main
tunnel, connection culverts, interception chamber, valve
chamber and a passive filter chamber.
A main ventilation column up to 6m high.
A small diameter ventilation column to the interception
chamber up to 6m high.
Maintenance vehicle access.
Electrical and control equipment installed within the
existing pumping station.
Table 3.1 sets out the site specific issues that have
influenced our permanent design proposals and how wehave addressed them in our proposed design.
Future use
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Future
use
Future use
19
Issue Our response
Visual effect of the permanent
works.
The above ground permanent works would be located mainly within the existing
pumping station compound. The exception would be the ventilation structure and
other permanent below ground works that would be located within well designed
potential new areas of public space.
The ventilation structure would be of a high quality design to ensure that it enhances
rather than detracts from the new area of public space.
Effect on York Gardens.
There would be no permanent effects on York Gardens from the operation of the
site which could be enhanced by any potential new areas of planted open space. An
enhanced access route to the gardens would be provided.
Effect on local amenities,
including York Garden Library
and Community Centre and
the York Gardens Adventure
Playground.
There would be no permanent effects on the York Gardens Library and Community
Centre or the York Gardens Adventure Playground from the operation of the site.
The proposals would help to link parts of York Gardens with key facilities and provide
an enhanced setting for local amenities.
The permanent layout and design of the site would require the removal of a disused
public toilet block, located adjacent to the pumping station in York Gardens. Ourproposals for the permanent layout and design of the site involve the replacement
of the toilet block with a planted public area that would link York Garden Library and
Community Centre and the York Gardens Adventure Playground.
Table 3.1: Site specific issues that have influenced our permanent design
Falconbrook Pumping Station
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Figure 3A: Photo of the site before the works
Figures 3A, 3B, 3C and 3D show the current site and
provide illustrations of our design proposals. Further
information on the development of our design can be
found in the Design development report.
Related documents:
Design
Future use
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Future use
21
Figure 3B: Artists impression of the site after the works are completed
Falconbrook Pumping Station
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Falconbrook Pumping Station
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Figure 3C: Aerial view of the completed works
Future use
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Figure 3D: Layout of site once construction works complete
Ventilation structures
within compound
Electrical and controlequipment within
existing building
Timber seatingRaised planter overCSO drop shaft
Falconbrook PumpingStation wall to be reinstated
Existing sewer
structure
York
Road
N
Ventilation column
Railings to bereinstated to
match existing
Existing bus stopto be reinstated
Valve chamberwithin compound
Falconbrook Pumping Station
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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 will 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 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 NewcomenRoad/ Lavender Road, which is the same as the current
arrangement for the existing pumping station.
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 arisingfrom the operation of the tunnel. The technology we are proposing to use at this
site includes the use of passive below ground carbon filters that will remove possible
odour before air leaves the ventilation equipment.
Disturbance from future
maintenance access.
Permanent access would be required for maintenance and servicing purposes to
the shaft and ventilation equipment. Any planned maintenance visits would be
undertaken during normal working hours and all visits managed to avoid disruption
to local residents, businesses and users of affected public areas as far as possible.Table 3.2: Key issues relating to site operation
Related documents:
Odour
Further information
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u t e o at o
This section sets out documents which may be of particular interest. Further information on our proposals can be
found on our website (www.thamestunnelconsultation.co.uk) or is available upon request (call our customer centre
on 0800 0721 086).
Phase two public consultation material
Project information papers include general information about the Thames Tunnel project. There are 17 project
information papers which cover various aspects of the project. Those project information papers that may be of
particular interest are set out below.
Icon Title Details
Build
Provides information on the different types of sites required for the Thames Tunnel
project and the typical construction activities that will be undertaken at each site.
Changes
Explains how the scheme has changed compared to that presented at phase one
consultation, including changes to the tunnelling strategy for the main tunnel and
changes to sites.
Q&A Consultation
Sets out the consultation we have undertaken to date on the project, the scope
of this phase two consultation and how interested parties can respond to thisconsultation.
DesignContains the design principles which have influenced the permanent appearance of
our sites once construction work is complete.
EnvironmentSets out the process the project is following to assess potential environmental effects
of the Thames Tunnel project.
Managing
construction
Includes information on what measures our contractors will put in place at our sites
during construction.
Odour Sets out ourAir management plan and how it will work.
Options Outlines the various ways to deal with sewage overflows.
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Phase two public consultation material
Icon Title Details
OverflowSets out how Londons sewerage system works and why the capital has an overflow
problem.
Route and
tunnel
alignment
Sets out the preferred route of the main tunnel and the reasons for our preference.
Site selection Sets out the process we followed to find and select our preferred sites.
Transport Contains information on the different transport options we have considered fordelivering and removing materials from our sites.
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 14 of the non-technical
summary and volume 14 of the PEIR for more information
on this site.
Phase two scheme
development
Design development
report
Provides a general overview of how the scheme design at
each site has evolved to date. Please refer to chapter 11 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 H for more information on this site.
Site glossary
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29
g y
Term Definition
Carbon filters Filters that remove odours before the air is released from the tunnel.
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 overflow, the sewer 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.
Foreshore Ground uncovered by the river when the tide is low.
Interception chamberA structure, built on an existing combined sewer, which diverts stormwater overflow into themain tunnel.
Main tunnel The tunnel from Acton Storm Tanks to Abbey Mills Pumping Station.
Operational phase After the completion of the construction work, when the main tunnel is in use.
Thames Tunnel project
The Thames Tunnel project comprises a storage and transfer tunnel, from west London to
Beckton Sewage Treatment Works in east London, and the control of 34 CSOs along the
Thames Tideway.
Transport for London
Road Network (TLRN)
The network of roads managed by Transport for London. These are the major or strategic
roads, which have high capacity.
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Falconbrook Pumping Station
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Phase two consultation: Falconbrook Pumping Station
For further information or to comment on our
proposals see our website:
www.thamestunnelconsultation.co.uk
110-ED-PNC-00000-000081
Autumn 2011
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