P2 Deptford CS SIP

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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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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

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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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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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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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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

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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


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


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

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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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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


Transport for London(TfL) road network

Proposed lorry access toTfL road network


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Construction

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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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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

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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



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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

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Figure 3B: Artists impression of the site after the works are completed

DRAFT IMAGE, PLACEHOLDER ONLY



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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

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



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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 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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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 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

It is very important that you understand theinformation we have provided. If you needfurther information in another language,

braille, large print or audio format pleasecontact us on 0800 0721 086.

P2 Deptford CS SIP

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