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I n t r o d

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I n t r o d

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Abbey MillsPumping Station

Thames Tunnel

S i t ei nf or m a t i on p a p er

1

Currently, untreated sewage regularly overows into the River Thames from London’s Victorian sewerage systemvia combined sewer overows (CSOs). The proposed Thames Tunnel would intercept these overows through the

use 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 Abbey Mills Pumping Station.

Key facts

Local authority: Newham

Site type: Main tunnel reception site

Duration of main construction works: Approximately four years.



Abbey Mills Pumping Station

2

Section 1: Introduction and site informationWe are proposing to use the southern and western part

of our existing Abbey Mills Pumping Station site for the

construction work. The site would receive the main tunnel

from Chambers Wharf and connect the main tunnel to

the Lee Tunnel, which would transfer the flows of sewage

to Beckton Sewage Treatment Works.

The location of the site is shown in Figure 1A, to the west

of Abbey Mills Pumping Station and the Lee Tunnel, which

is currently under construction. The site is located within

the Three Mills Conservation Area, with Prescott Channel

to the west and the Channelsea River to the south and

east. Residential properties are located to the north and

north west of the site on Gay Road and Riverside Road.

This site information paper sets out our proposals at

Abbey Mills Pumping Station. We have also produced

project 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.

Related documents:

Build

Beckton SewageTreatment Works

BSTW



Introduction

3

Figure 1A: Abbey Mills Pumping Station location plan

Three MillsStudios

C h a n n e l s e

a R i v e

r

Three MillsGreen

Three Mills Lock

Abbey MillsPumping Station

P r e s c o t t C

h a n n e l

N

Local authority boundary

Draft limit of land to beacquired or used

Proposed tunnelroute – centreline

Lee Tunnel currentlyunder construction

R i v

e r s i d

e R o a d

G a y R o a

d

NEWHAM

TOWERHAMLETS




4

Why we have amended our proposalsSince January 2011, we have considered the comments

from phase one consultation, feedback from ongoing

engagement and new information; and undertaken

further technical work. We reviewed our tunnelling

strategy and concluded that Abbey Mills Pumping Station

should be used as a main tunnel reception site rather

than a main tunnel drive site, with the main tunnel being

driven to Abbey Mills Pumping Station from Chambers

Wharf. This is because:

•Further technical work has shown that transporting

material to and from the site by the River Lee would be

very difficult to achieve and is highly undesirable when

material needs to be transported daily over a two to

three year period. This level of barge movements would

be required if Abbey Mills Pumping Station were to be

used as a main tunnel drive site, given the volume of

excavated material that would be produced.

•Given the constraints to using the River Lee to transport

materials, we would need to use the residential roads to

access the site.

In comparison, Chambers Wharf has significantly better

river access for transporting materials. There are also

fewer navigational restrictions on the River Thames when

compared to the River Lee, which would allow the use of larger barges and therefore more efficient transportation

of materials.

How we chose this site

What we proposed at phase one consultationIn addition to sites to intercept the CSOs, we require sites

to build the main tunnel at:

•each end of the main tunnel in west and east London

•suitable intervals along the route of the main tunnel

• locations where the type of geology that the main

tunnel goes through changes.

Prior to identifying the precise location of the main tunnel

sites, we established the broad areas within which they

would be needed. One of the main tunnel sites is required

in the Abbey Mills Pumping Station area, which is where

the main tunnel would end.

Through our site selection process, we identified three

possible shortlisted sites which could be used as a main

tunnel drive site. At phase one consultation, which was

held between September 2010 and January 2011, we

presented these sites:

•Three Mills Studios

•Three Mills Green

•Abbey Mills Pumping Station.

Abbey Mills Pumping Station was identified as our

preferred site at phase one consultation to drive the maintunnel to King’s Stairs Gardens.



Introduction

5

What we are proposing at phase two consultationAbbey Mills Pumping Station is our preferred site for

a main tunnel reception site. This is because using this

site allows us to make use of land that we own, is part

of a large area of brownfield land and is close to the

Lee Tunnel shaft which the main tunnel would need

to connect to in order to transfer the flows to Beckton

Sewage Treatment Works.

Related documents:

Changes

Q&A Consultation

Site selection

Beckton SewageTreatment Works

Chambers Wharf CW

BSTW




6



Construction

C on s t r u c t i on

7

Section 2: Construction

Construction activitiesConstruction activities are required to construct the

main tunnel. We would construct a shaft with an internal

diameter of approximately 20m (approximately 67m

deep) to connect to the main tunnel. The shaft would

receive the tunnel boring machine from Chambers Wharf

which would be removed from the shaft and removed

from the site. The shaft would also be used to install

the secondary lining 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, in five main phases,

lasting approximately four years in total. The main

construction activities associated with these phases are

set out in Table 2.1.

Related documents:

Build

Managing construction

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

Shaft

Main tunnel

Lee Tunnel

Lee Tunnel shaft




8

Advanceworks

Phase 1

Site setup

Figure reference _ Figure 2C

Typical working hours Varies Standard

M a i n c o n s t r u c t i o n

a c t i v i t i e s

Utilities connected ü

Utilities diverted or protected ü

Site cleared ü

Site facilities and access set up ü

Shaft excavated and built

Lee Tunnel connection built

Tunnel boring machine removed from shaft and disassembled

Internal (secondary) tunnel lining constructed

Above and below ground structures constructed

Mechanical 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 SaturdaysContinuous: 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



Construction

9

Phase 2

Shaft construction

Phase 3

Secondary lining

Phase 4

Construction of

other structures

Phase 5

Completion of

works and siterestoration

Figure 2C Figure 2D Figure 2D _

Standard with

occasional extended

standard

Continuous Standard Standard

ü

ü

ü

ü

ü

ü

ü

ü

* 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.




10

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. A particular factor at this site that has

influenced the layout is as follows:

Year 1

A d v a n c e

w o r k s

Year 2 Year 3 Year 4

P1

P2

P3

P4

P5

Figure 2B: Construction timeline showing approximate duration of

works in phases (P)

•If the Lee Tunnel is able to use barges on the River

Lee via Bow Creek and the Prescott Channel toexport materials from its shaft construction, similar

arrangements could be used for construction activities

at this site. Our site layout has changed to reflect this.

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.



Construction

11

Figure 2C: Illustrative phases 1 and 2 construction plan

Shaft

Piling rig

Cranes

N

Lee Tunnel shaft

Maximum extent of construction site forphases 1 and 2

Site hoarding


Site support/welfare

Excavated materialstorage and processing

Maintenance workshopand storage

Construction support

Internal site road

Site access

Option for contractorto transport materials

using barges

TOWERHAMLETS

C h a n

n e l s e

a R i v e

r

P r e s c o t t C

h a n n e l

R i v

e r s i d

e R o a d

G a y R o a d

NEWHAM




12

Figure 2D: Illustrative phases 3 and 4 construction plan

Shaft

Cranes

N

Maximum extent of construction site for

phases 3 and 4Site hoarding


Site support/welfare

Maintenance workshopand storage

Construction supportInternal site road

Site access

TOWERHAMLETS

C h a n

n e l s e

a R i v e

r

P r e s c o t t C h a

n n e l

R i v

e r s i d

e R o a d

G a y R o a d

Option for contractorto transport materials

using barges

NEWHAM

Lee Tunnel shaft



Construction

13

Additional works and activities

The main construction activities at this site are set out in

Table 2.1. We would also need to undertake additionalworks and activities, some of which may be located

outside of the area indicated by the red line in Figure 1A.

The anticipated additional works and activities are set

out in Table 2.2.

When Type of works What we would do

Required for

construction phase

Installation of equipment to monitor

environmental matters such as noise,vibration and dust.

The locations of monitoring equipment would

be agreed with the local authority and relevantlandowners.

Protection works to third party

structures (such as buildings, bridges

and tunnels).

We would undertake studies to identify any effects our

construction work may have on third party structures.

The studies may recommend particular construction

methods or, in very limited instances, protection works.

Temporary connection to utilities

(such as water, sewer, phone and

electricity supply).

We expect to connect to utilities within the pumping

station site.

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 from within the

pumping station site.

Table 2.2: Additional works and activities




14

Construction transport and access

We have considered the use of the River Lee to transport

materials to and from this site, however, given thenavigational constraints and the relatively small volumes

of material that we would need to move, we consider

that it is unlikely to be cost effective. We have therefore

assumed that all materials would be moved by road.

However, the scope of works currently being carried out at

this site as part of the Lee Tunnel contract is very similar

to our proposed scope of works. If the Lee Tunnel shaft

construction proves that river transport is viable from this

site, it is likely that we would adopt the same strategy.Table 2.3 sets out the anticipated average daily number

of lorries visiting (ie travelling to and from) the site during

the peak months of each phase.

Construction traffic would access the site from High

Street (A11), turning right into Abbey Lane and turningleft into the site via an existing entrance from Gay

Road. Traffic would leave the site via the same route.

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.

The existing footpath around the site is being reinstated

as part of the current Lee Tunnel works. Our works for the

Thames Tunnel project would not affect the footpath.Based on our current design we do not anticipate that

any parking bay suspensions, road diversions, bus stop

relocations or junction changes would be required.

Phase 1

Site setup

Phase 2

Shaftconstruction

Phase 3

Secondarylining

Phase 4

Constructionof other

structures

Phase 5

Completion of works and site

restoration

Average daily

lorry visits 25 lorries 53 lorries 18 lorries 28 lorries 11 lorries

Table 2.3: Average daily lorry visits during the peak months

Related documents:

Transport



Construction

15

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

High Street

Abbey Lane

Gay Road

A11

A12

G a y R o a

d

Left turn in,right turn out

Existingentrance

NEWHAM

TOWERHAMLETS

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

N

Abb Mill P i St ti




16

Management of construction works

Our 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 CoCPs

from 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



Construction

17

Issue Our response

Loss or displacement of some of theallotments west of the Abbey Mills

Pumping Station.

Since phase one consultation, we have revised our proposals for the site to

ensure that the location of construction activities would not result in the lossof any allotment plots. The decision not to use this site as a main tunnel drive

site means that a smaller site is now required for construction.

Possible effect on the footpath around

the site linking the Greenway to Three

Mills Green.

The existing footpath around the site is being reinstated as part of the current

Lee Tunnel works. Our works for the Thames Tunnel project would not affect

the footpath.

Possible effect of construction vehicleson the capacity and operation of the

local road network.

We have sought to minimise disruption to the local road network through

our site layout and design. We would manage the effects of road transportthrough 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.

Possible effect of noise and vibration

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. Continuous

tunnelling would only be undertaken for a short period of time to connect the

main tunnel to the Lee 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, will would be set out in the CoCP.

Table 2.4: Key issues relating to construction

Related documents:

Managing construction

Transport

Abbe Mills P mping Station




18

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

Since phase one consultation we have progressed the

design for the permanent use and appearance of the

structures at Abbey Mills Pumping Station. The design

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

and ongoing engagement with the London Borough of

Newham 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 main tunnel shaft with an internal diameter

of approximately 20m and connection works to the

Lee Tunnel.

•Three ventilation columns up to 9m high.

•Maintenance vehicle access.

Table 3.1 sets out the site specific issue that has

influenced our permanent design proposals and how we

have addressed this issue in our proposed design.

Issue Our response

The effect on the setting of

the Grade II* listed Abbey Mills

Pumping Station and character of

the Three Mills 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 effects on the listed building

or Conservation Area.

The ventilation column would be modern in design, reflecting its function and the

appearance of the adjacent modern pumping station and other recent structures

that have been accommodated in this setting.

Table 3.1: Site specific issue that has influenced our permanent design

Future use



F u t ur e

u s e

Future use

19

Figure 3A: Aerial view of the completed works

Related documents:

Design

Figures 3A and 3B provide illustrations of our design

proposals. Further information on the development of our

design can be found in the Design development report.





20

Figure 3B: Layout of site once construction works complete

Lee Tunnelshaft

Access for maintenance vehicles from existing

road within Abbey Mills Pumping Station site

Fans and filters for odour treatmentprovided by Lee Tunnel projectVentilation columns

Three MillsStudios

Fence around Lee Tunnel

and Thames Tunnel shafts

Grassed area

C h a n n

e l s e

a R i

v e r

N

Future use



Future use

21

Operation and maintenance

Once 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 would 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 and inspection vehicle

into the shaft. This is likely to take several weeks, and

would all be undertaken within our site.

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 within the

pumping station site, accessed from Gay Road.

Management of operational effects

We 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.

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

an Air 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 a mechanical ventilation system that draws air through the tunnel with fans

before cleaning the air using carbon filters that will absorb possible odour before air

leaves the ventilation equipment.

Disturbance from future

maintenance access.

The permanent access to our site would remain unchanged and visits would be

undertaken as part of the existing maintenance routine.

Table 3.2: Key issues relating to site operation

Related documents:

Odour

Further information



Further information

22

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 our Air management plan and how it will work.

Options Outlines the various ways to deal with sewage overflows.

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).



23

Phase two public consultation material

Icon Title Details

OverflowSets out how London’s 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.

Site information papers provide information that relate to each preferred site along the route of the Thames Tunnel

project. The following site information papers may be of particular interest.

Beckton Sewage Treatment Works

Chambers Wharf CW

BSTW

Further information



Further information

24

Technical reports

Theme Icon Title Details

Phase one

consultation1

SUMMARY

Report on phase one

consultation:

summary report

Provides a summary of the comments made at phase one

consultation and our responses.

Phase two

construction

information

Code of construction

practice Part A:

General requirements

(CoCP)

Sets out control measures to be adopted during the project

construction period.

Phase two

environmental

information

Air management

plan

Outlines the methods which we will use to manage odour

from the main tunnel at all our preferred sites.

Preliminary

environmental

information report

(PEIR)

Contains initial assessments on the environmental effects of

the Thames Tunnel project based on information collected

to date. Please refer to volume 27 of the non-technical

summary and volume 27 of the PEIR for more informationon this site.

Phase two scheme

development

Design development

report

Provides a general overview of how the scheme design at

each site has evolved to date. Please refer to chapter 21 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 W for more information on this site.

Site glossary



25

Site glossary

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.

Connection tunnel A tunnel connecting a drop shaft to the main tunnel.

Conservation areaAn area designated by the local authority or English Heritage as having special

architectural or historical interest.

Draft limit of land to be

acquired or used

The extent of land that we may need to use or acquire, or over which rights may be needed

to carry out works that are essential to the project.

Lee TunnelA tunnel, currently under construction, which will intercept the Abbey Mills Pumping Station

CSO, store and then transfer flows onward to Beckton Sewage Treatment Works.

Main tunnel/connection

tunnel drive site

A site that would be used to construct the main tunnel or connection tunnel. The excavated

material would be removed from the tunnel and the concrete tunnel lining segments would

be delivered to the tunnel at the main/connection tunnel drive site.

Main tunnel/connection

tunnel reception site

The tunnel would be constructed from a drive site to a reception site. Once the tunnel

arrives at the reception site, the tunnel boring machine would be dismantled and removed.

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.

Secondary lining A second, internal lining to the tunnel, giving it additional strength.

Thames Tunnel project The Thames Tunnel project comprises a storage and transfer tunnel, from west London toBeckton Sewage Treatment Works in east London, and the control of 34 CSOs along the

Thames Tideway.

Transport for London

Road Network (TLRN)

The network of roads managed by Transport for London. These are the major or ‘strategic’

roads, which have high capacity.

Tunnel boring machine

(TBM)

A machine used to excavate tunnels through a variety of conditions, with a circular

cross-section.



y p g

28

Phase two consultation: Abbey Mills Pumping Station

110-ED-PNC-00000-000067

For further information or to comment on ourproposals see our website:

www.thamestunnelconsultation.co.uk

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.

Autumn 2011

p2 abbey mills pumping station sip

Documents