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Introd
uction
Thames Tunnel
Siteinformationpaper
1
Deptford Church StreetAlternative to Borthwick Wharf Foreshore
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 Deptford Church Street.
Key facts
Local authority: Lewisham
CSO name: Deptford Storm Relief
CSO spill volume in an average year: 1,500,000m (equivalent to approximately
600 Olympic swimming pools)
Site type: CSO site
Duration of main construction works: Approximately three and a half years.
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Deptford Church Street
2
Section 1: Introduction and site information
Related documents:
Build
We are proposing to use a site at Deptford Church
Street for this construction work and to accommodatepermanent structures required to operate the main
tunnel. The site would be used to connect the existing
local CSO, known as the Deptford Storm Relief CSO, to the
main tunnel via a long connection tunnel, known as the
Greenwich connection tunnel.
The location of the site is shown in Figure 1A. Deptford
Church Street (A2209) is to the east of the site, beyond
which is the Sue Godfrey Nature Reserve and residentialproperties. Coffey Street and St Pauls Church, a Grade
I listed church are located to the north. To the south
and west is Crossfield Street and to the south west is St
Josephs Roman Catholic Primary School. The site is within
the St Pauls Conservation Area.
This site information paper sets out our proposals at
Deptford Church Street. We have also produced projectinformation 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: Deptford Church Street location plan
N
CSO discharge into River Thamesapproximately 300 metres to the north
Deptford StormRelief CSO
St Josephs RCPrimary School
Deptford Station
WavelengthsLeisure Centre
St Pauls
Church
DeptfordCreek
De
ptford
HighStreet
CoffeyStreetCrossfield Street
De
ptfor d
Chur chSt
r e e t
Sue GodfreyNature Reserve
CreekRoad
LEWISHAM
GREENWICH
Local authority boundary
Draft limit of land tobe acquired or used
Existing sewer
Greenwich PumpingStation site
Proposed tunnelroute centreline
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Deptford Church Street
4
Related documents:
Changes
Q&A Consultation
Site selection
How we chose this site
What we proposed at phase one consultationAt phase one consultation, which was held between
September 2010 and January 2011, Borthwick Wharf
Foreshore was identified as our preferred site to intercept
the Deptford Storm Relief CSO.
Why we have amended our proposals
Since January 2011, we have considered the comments
from phase one consultation, feedback from ongoing
engagement and undertaken further technical work. This
has resulted in us re-assessing potential sites to intercept
the Deptford Storm Relief CSO.
Two shortlisted sites were identified. The first is land
adjacent to Bronze Street and the second is Deptford
Church Street. In June 2011, we held drop-in sessions for
the community to understand any local issues they may
have, should there be a site in 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 three shortlisted sites to intercept the
CSO, as shown in Figure 1B. These are:
Borthwick Wharf Foreshore (site 1)
Land adjacent to Bronze Street (site 2)
Deptford Church Street (our preferred site).
Deptford Church Street is our preferred site to intercept
the Deptford Storm Relief CSO because in comparison to
our preferred site at phase one consultation, Borthwick
Wharf Foreshore, this site has relatively good access and
avoids work in the foreshore of the River Thames.
Site 1 Borthwick Wharf Foreshore is a shortlisted
site. It is considered less suitable than our preferred site
because of the potential effects on residential, visitor and
business amenity and due to restricted vehicular access
along Glaisher Street, a private road, which is less suitable
for heavy good vehicles. Although the use of barges to
transport material could help to reduce these potential
effects, lorries would still need to be used to transport
some materials to and from the site. Furthermore, the use
of barges at this site would be complicated by the existing
derelict jetty.
Site 2 Land adjacent to Bronze Street is a shortlistedsite. It is considered less suitable than other sites because
it would cause more disruption to Deptford Church
Street as works would need to be carried out across both
carriageways.
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Introduction
5
Figure 1B: Preferred and shortlisted sites
N
Deptf
ord
Creek
CreekRoad
BorthwickStreet
EvelynStreet
ConvoysWharf
Site 1
Site 2
Preferred site Deptford Church Street
Other shortlistedsite locations
Local authorityboundary
GREENWICH
TOWERHAMLETS
LEWISHAM
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Deptford Church Street
6
Section 2: Construction
Construction activitiesConstruction activities are required to intercept the
CSO. To intercept the CSO, we would construct an
interception chamber. A connection culvert would link
the interception chamber to a drop shaft (approximately
46m deep) through which flows would pass into the
Greenwich connection tunnel before connecting into
the main tunnel. Figure 2A illustrates the below ground
infrastructure proposed. These activities would take place
within the area indicated by the red line in Figure 1A, infour 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.
After completion of the works and site restoration, we
may need to visit the site for short periods to support
finishing works at the bottom of the shaft. These would
be carried out from within the tunnel and serviced from
the site at Greenwich Pumping Station. For example, wemay need to provide ventilation for the workers in the
tunnel and a means of emergency escape.
Related documents:
Build
Managing construction
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Construction
Construction
7
Figure 2A: Illustration showing typical elements of below ground infrastructure
Drop shaft
Greenwichconnection tunnel
Valve chamber
Existing sewer
ExistingoverfowtoRiver Thames
Interception chamber
Existingoverfowsewer
Connection culvert
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Deptford Church Street
8
Advance works
Phase 1
Site setup
Figure reference Figure 2C
Typical working hours VariesStandard with occasional
extended standard
Mainconstructionactivities Utilities connected
Utilities diverted or protected
Site cleared
Site facilities and access set up
Drop shaft 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
Construction of
other structures
Phase 4
Completion of
works and siterestoration
Figure 2C Figure 2D
Standard with occasional
extended standardStandard Standard
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Deptford Church Street
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Site layout and construction phases
Figures 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 drop shaft has been located as centrally as possiblewithin the site to maximise distance from sensitive
receptors such as the Grade I listed St Pauls Church, St
Josephs Roman Catholic Primary School, and the Grade
II listed viaduct.
We have designed a construction access to this site
that includes a one way system. This would be safe
for pedestrians and vehicles on surrounding roads and
footpaths and provide a controlled access for vehicles
entering and leaving site. It would also help ensure
safety on site by reducing the need for vehicles to turn
within the site.
The site layouts are indicative only, and the contractor
may arrange the site in a different way, depending onthe chosen construction methods, provided that any
environmental effects are appropriately managed, and
that the main construction activities are undertaken
within the red line shown in Figure 1A.
P1
P2
P3
P4
Year 1 Year 2 Year 3 Year 4
Advan
ce
works
Figure 2B: Construction timeline showing approximate
duration of works in phases (P)
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Construction
11
Figure 2C: Illustrative phases 1 and 2 construction plan
Cranes
Drop shaft
Piling rig
CrossfieldStreet
N
GREENWICH
Maximum extent ofconstruction site forphases 1 and 2
Site hoarding
Local authority boundary
Site support/welfare
Excavated materialstorage and processing
Maintenance workshopand storage
Construction support
Internal site road
Site access
Existing footpath tobe diverted
Footpath diversion
CoffeyStreet
LEWISHAM
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Figure 2D: Illustrative phase 3 construction plan
Crane
Drop shaftCrossfieldStreet
Piling rigTwo way
traffic flow
N
CoffeyStreet
GREENWICH
LEWISHAM
Maximum extent ofconstruction site for
phase 3Site hoarding
Local authority boundary
Site support/welfare
Excavated materialstorage and processing
Maintenance workshopand storage
Construction support
Internal site road
Site access
Existing footpath tobe diverted
Footpath diversion
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Construction
13
Additional works and activities
The 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
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.
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 utilityproviders to undertake the necessary works.
Temporary connection to utilities
(such as water, sewer, phone and
electricity supply).
We expect to make a connection to water, sewer and phone
supplies in Coffey Street or Deptford Church Street (A2209).
We expect to connect to electricity from Stowage, running
cables along Gonson Street, Creekside and Bronze Street,
however we are still developing a route for power supply in
discussion with the utility provider.
Traffic management works.
These may need to extend beyond our site and could include
relocating kerb lines, repainting road lines and modifying
traffic signals.
Required for
operational phase
Permanent connection to
utilities (such as water, phone
and electricity supply) for the
operational tunnel.
We expect to connect to utilities in Deptford Church Street
(A2209).
Table 2.2: Additional works and activities
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Deptford Church Street
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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 from Blackheath
Road (A2) travelling northbound along Deptford Church
Street (A2209), turning left into Crossfield Street and
right into the site from a new entrance on Crossfield
Street. Traffic leaving the site would turn right from a new
entrance on Coffey Street and left onto Deptford ChurchStreet (A2209), then return to Blackheath Road (A2)
using Creek Road (A200), Norman Road and Greenwich
High Road (A206). 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 may need to suspend or relocate some parking
bays on Coffey Street and on Crossfield Street during
construction.
While the connection to the existing sewer in Deptford
Church Street (A2209) is constructed (construction phase3) we would need to close the two northbound lanes, as
shown on Figure 2D. The two southbound lanes would
provide two way access along Deptford Church Street
(A2209). The bus lane would be suspended to enable this,
and buses would need to use the general traffic lanes.
The northbound bus stop near Coffey Street and the
southbound bus stop near the railway bridge may also
need to be moved during this phase and the footpathalong the western side of Deptford Church Street (A2209)
would be diverted around the site. Based on our current
design, we do not anticipate that any junction changes
would be required.
Phase 1
Site setup
Phase 2
Drop shaftconstruction
Phase 3
Construction ofother structures
Phase 4
Completion ofworks and site
restoration
Average daily
lorry visits
2 lorries 24 lorries 13 lorries 5 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
DeptfordChurch Street(A2209)
Blackheath Road
Creek Road
Norman Road
GreenwichHigh RoadA206
A200
A2
N
CoffeyStreet
CrossfieldStreet
Rightturn out
Suspensionof parking
Rightturn in
LEWISHAM GREENWICH
Bus stoprelocation
Draft limit of land tobe acquired or used
Internal site road
Site access
Local authority boundary
Transport for London(TfL) road network
Proposed lorry access toTfL road network
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Construction
17
Issue Our response
Temporary loss of open space.
We will consult the London Borough of Lewisham and are considering opportunities
to improve other open spaces in the local area to compensate for the temporary loss
of open space during construction.
Potential loss of and damage to
trees on site.
Construction activities at this site would result in the removal of all existing trees
from Deptford Green. Permanent site landscaping would however incorporate the
replacement of trees lost during construction with native species. The potential
for planting to be part of the councils tree planting plan for the area is being
considered.
Removal of the wall running
through the site.
We will work with the London Borough of Lewisham and English Heritage to
consider ways to acknowledge the wall within the permanent landscape design and
planting for the site.
Temporary closure of the
northbound lanes of Deptford
Church Street (A2209) and
suspension of bus lanes during
construction phase 3.
During construction, two-way traffic along Deptford Church Street (A2209) would
be maintained by using the two southbound lanes. Bus services would continue to
run along this route by using the general traffic lanes, although there may be some
delay to journey times. The traffic management plan for the site would ensure that
lane alterations are managed safely and with minimal disruption.
Temporary suspension or
relocation of some on-street
parking on Coffey Street and
Crossfield Street.
The extent and duration of the suspension of any on-street parking during
construction would be minimised as far as possible. We are investigating options for
temporary replacement parking provision during construction where necessary.
Possible effect of noise and
vibration from construction
activities on neighbouring areas.
The contractor would be required to implement noise and vibration control
measures at the worksite, which will be set out in the CoCP.
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
Deptford Ch rch Street
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Deptford Church Street
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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 Deptford Church Street follows our scheme-
wide principles and takes into account comments raised
during ongoing engagement with the London Borough ofLewisham 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 17m, connection culverts, interception
chamber, valve chamber and a passive filter chamber.
Four main ventilation columns up to 6m high.
A small diameter ventilation column to the interception
chamber up to 6m high.
Maintenance vehicle access.
An electrical and control kiosk.
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
19
Issue Our response
Effects on the existing open space
including trees.
The site would be returned as an open space once construction works have
been completed, and we have illustrated the potential for an enhanced space
to be created for the benefit of the local community. We would work with
the local community and council during the development of our design and
construction to work up the detail of the space.
The majority of the proposed permanent works on this site would be below or
at ground level, so would not significantly affect the amount of open space
available at the site.
All of the existing trees located in the centre of the site would be lost, but highquality tree planting would form part of the enhanced space to be created.
Effects on the Grade I listed church
of St Pauls to the north of the
site, Grade II listed viaduct to the
south, and character of St Pauls
Conservation Area.
The majority of the proposed permanent works on this site would be below
or at ground level, so are unlikely to have any significant effect on the listed
buildings or Conservation Area.
The enhancements that we are to make to the open space would enhance the
setting of the church and promote peoples enjoyment of it.
The proposed ventilation columns have been located away from the Grade I
listed church.
London Borough of Lewishams
aspirations for the creation of an
east-west link across Deptford.
Lewisham has an aspiration for an east west link across Deptford extending
from Deptford Creek to Deptford High Street and beyond. As part of the
proposals for this site, a new east west link across the site is indicated as a
new pathway across the open space running parallel to the existing pavement
on Coffey Street proving links between Deptford Church Street (A2209) and
Deptford High Street.
Table 3.1: Site specific issues that have influenced our permanent design
Deptford Church Street
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Deptford Church Street
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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 an illustration of our design proposals. Further
information on the development of our design can be
found in the Design development report.
Related documents:
Design
Future use
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Future use
21
Figure 3B: Artists impression of the site after the works are completed
DRAFT IMAGE, PLACEHOLDER ONLY
Deptford Church Street
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Deptford Church Street
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Figure 3C: Aerial view of the completed works
Future use
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23
Figure 3D: Layout of site once construction works complete
Seasonal bulbplanting and wildflower meadow
Densely plantededge to DeptfordChurch Street
Mownlawn
CoffeyStreet
DeptfordCh
urchStreet
CrossfieldStreet
Ventilationcolumns
New shared surfacetreatment to CoffeyStreet. Links park toChurch grounds
Removable bollardsfor access formaintenance vehicles
Footpath
widened
Electrical and controlkiosk and integratedinformation board
Low ornamentalhedges
Timberseating
Planters Parking
Fruit treesFenced informalplay area withscented planting
Green featurescreen withclimbing plants
N
Line of seasonalbulb plantingmarking position
of wall
Hardstandingfor maintenance
access
Ventilationcolumn
Deptford Church Street
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Deptford Church Street
24
Operation and maintenanceOnce the tunnel is operational, we would need access
to the site occasionally for inspection and maintenance
purposes. We expect to visit the site approximately
once every three to six months to carry out inspections
and maintenance of the ventilation and below ground
equipment. This is likely to involve a visit by staff in a
small van, and may take several hours.
Once every ten years, we expect to carry out a major
internal inspection of the tunnel and underground
structures. This is likely to involve a small team of
inspection staff, a small team of support crew and two
mobile cranes to lower the team and inspection vehicle
into the shaft. This is likely to take several weeks, 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 Coffey Street.
Management of operational effectsWe have undertaken technical work, including stakeholder
engagement, to assess and identify the key issues
associated with this site once it is operational. Table
3.2 summarises these issues and how we are currently
proposing to address them.
Future use
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25
Issue Our response
Possible odour effects during
the operation of the tunnel.
Odour effects at this site are expected to be negligible because we have 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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26
u t e o at o
This section sets out documents which may be of particular interest. Further information on our proposals can be
found on our website (www.thamestunnelconsultation.co.uk) or is available upon request (call our customer centre
on 0800 0721 086).
Phase two public consultation material
Project information papers include general information about the Thames Tunnel project. There are 17 project
information papers, which cover various aspects of the project. Those project information papers that may be of
particular interest are set out below.
Icon Title Details
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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28
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 25 of the non-technical
summary and volume 25 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 23 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 U for more information on this site.
Site glossary
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g
Term Definition
Carbon filters Filters that remove odours before the air is released from the tunnel.
Combined sewer A single sewer system that takes both rainwater and domestic and industrial wastewater.
Combined sewer
overflow (CSO)
A structure, or series of structures, that allows sewers to overflow into the river when they
are full as a result of increased rainfall. Without the overflows, the sewers would back up
and cause flooding in streets or houses.
Conservation areaAn area designated by the local authority or English Heritage as having special
architectural or historical interest.
Draft limit of land to beacquired or used The extent of land that we may need to use or acquire, or over which rights may be neededto carry out works that are essential to the project.
Drop shaft
A vertical circular concrete structure, used to drop flows from the high level of the CSO to
the low level of the main tunnel. It would also be used to provide access to construct the
connection tunnels.
Interception chamberA structure, built on an existing combined sewer, which diverts stormwater overflow into the
main tunnel.
Main tunnel 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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Phase two consultation: Deptford Church Street
For further information or to comment on our
proposals see our website:
www.thamestunnelconsultation.co.uk
110-ED-PNC-00000-000078
Autumn 2011
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