Cremorne Wharf Depot, Lots Road, Chelsea - Thames … · Cremorne Wharf Depot, Lots Road, Chelsea ... Approximate length of time of construction Four years ... with a single lane

Counters Creek storm relief sewer

5

3

4

2

1

Site information paper

Site 1

Cremorne Wharf Depot, Lots Road, Chelsea

Key information boxLocal Authority Royal Borough of Kensington and ChelseaSite name Cremorne Wharf Depot, Lots Road, ChelseaNames of the sewers we are intercepting at this location Walham Green Storm Relief Sewer and Low Level No. 1 SewerSite type Main drive site, interception of the above mentioned sewers, discharge connection to Low Level No.1 Sewer, discharge to Thames Tideway Tunnel

Depth of drive shaft Approximately 40 metres deepApproximate length of time of construction Four yearsRoads affected Cremorne Road, Lots Road and Ashburnham RoadAnticipated dates on site (subject to planning permission and agreements with Tideway and landowners) March 2017 to December 2020 (inclusive)

Key Proposed storm relief sewer1 Cremorne Wharf Depot, Lots Road, Chelsea

2 Land adjacent to Talgarth Road and Trevanion Road, Hammersmith

3 Maclise Road car park and woodland, adjacent to Kensington Olympia Station

4 A section of the car park at Tesco Superstore, Shepherd’s Bush Road

5 Holland Villas Road at its junction with Lower Addison Gardens

1

2 Counters Creek storm relief sewer

The Counters Creek Flood Alleviation Scheme is required to reduce the risk of flooding to basement properties within the Counters Creek catchment in the London Borough of Hammersmith and Fulham and the Royal Borough of Kensington and Chelsea. The present Counters Creek flooding register shows that over 1,700 properties are subject to flooding. It’s believed there are also unreported basement flooding incidents in the area and new reports of flooding continue to be received.

Basement flooding occurs when sewers become overwhelmed by storm water runoff and local sewer water levels rise and back up the sewerage network into basement properties. Several factors contribute to local sewer flooding:

Underground buildingProperties with areas below ground are more likely to be flooded because they are closer to or below the level of the sewers in the road.

The wider catchmentThe Counters Creek catchment receives storm flows from as far away as Brent and Camden reducing the capacity to deal with local storm flows.

Loss of natural drainageA loss of green space and an increase in impermeable surfaces results in more rainwater entering the sewer network.

We analysed each area to identify the cause of flooding and to establish the best solution to reduce the problem. We considered a number of possible solutions including installing anti-flooding devices which are small pumping devices known as Flooding Local Improvement Programmes (or FLIPs), constructing Sustainable Drainage Systems (or SuDS) and improving the existing

sewers. These approaches only provided some protection for some properties. A new storm relief sewer is needed in addition to these other measures to substantially reduce the risk of sewer flooding.

Related documents:

• Why we need the Counters Creek storm relief sewer

Background

HAMMERSMITH

BARNES

CHISWICK

West Kensington South Kensington

KENSINGTON

KENSINGTON AND CHELSEA

Shepherd’s Bush

Earls CourtExhibiton Centre

Westfield Shopping Centre

Stamford Bridge

Barons Court

GloucesterRoad

High StreetKensington

GoldhawkRoad

StamfordBrook

RavenscourtPark

Fulham Broadway

ParsonsGreen

HAMMERSMITH AND FULHAM

EarlsCourt

Olympia London

5

3

4

2

1

Key Proposed storm relief sewer The main sewers in this area of London

1 Cremorne Wharf Depot, Lots Road, Chelsea

2 Land adjacent to Talgarth Road and Trevanion Road, Hammersmith

3 Maclise Road car park and woodland, adjacent to Kensington Olympia Station

4 A section of the car park at Tesco Superstore, Shepherd’s Bush Road

5 Holland Villas Road at its junction with Lower Addison Gardens

1


Counters Creek storm relief sewer 3

Section 1: Introduction and site information

IntroductionThis site information paper sets out our proposals at Cremorne Wharf Depot, Lots Road as shown in Figure 1. We have also produced additional documents which explain general topics relating to the project. Where we consider an additional document 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.

Site location and surroundingsThe site lies within the administrative boundary of the Royal Borough of Kensington and Chelsea. The site is located next to the River Thames foreshore on the southern side of Lots Road. The site includes Cremorne Wharf, the existing Lots Road Pumping Station and a temporary deck that extends into the River Thames.

Two additional temporary site extensions into Lots Road with a single lane closure at the two entrances to the site will also be required for short periods.

Cremorne Wharf depot is owned by the Royal Borough of Kensington and Chelsea. It has been leased to Thames Water for use in connection with the construction of the Thames Tideway Tunnel (Tideway) for which a Development Consent Order was made in September 2014. Before the site was leased to Thames Water, it was used for the storage of highway department materials and vehicles, and for waste management uses.

Cremorne Wharf has a depot building, similar to a large shed or warehouse, which is clad in corrugated sheet metal. There is also an office, welfare facility, two weighbridges, a paved area and a jetty in the river. The depot building will be demolished as part of the Tideway project and shall be reinstated unless agreed otherwise with the landowner.

Cremorne Wharf was designated Safeguarded Status in 2005 and was continued following the Mayor of London’s Safeguarded Wharves Review 2011/12. This ensures the wharf is protected from re-development into non-port use. It last handled cargo before 1997. The site is also allocated as a waste management site although waste transfer no longer takes place.

We own and operate the Grade II listed Lots Road Pumping Station, positioned on the existing Counters Creek sewer and Walham Green storm relief sewer, as an emergency pumping station. The pumping station is a red brick building which fronts onto Lots Road.

To the north and north west of the site is Lots Road, which has a speed limit of 30mph and two-way traffic flows. Cremorne Road, north of Lots Road, is designated as a Red Route. National Cycle Route 4 passes through Lots Road. Wandsworth Town railway station is approximately 2.5km to the south of the site and Imperial Wharf Tube Station is located 300m to the south west of the site.

*Shafts No.1, No.2 and No.3 are described later in this documentFigure 1 Site map

New storm relief sewerLow Level No. 1 sewerThames Tideway TunnelWalham Green SRSDrop shaftInterception chamber

Drive shaftTemporary platformMain siteBorough boundariesExisting local sewers

0 25 50 75 100

Metres

Key :Low Level No.1 sewer interception chamber

Drive Shaft(Shaft No.2)Interception

chamber

Shaft No.1

Shaft No.3

Lots

Road

Ashburnham Road

Cremorne Road


There are a range of land uses surrounding the site including residential, commercial, retail, industrial and educational as well as areas of open space. Along Lots Road there are mainly residential units of three and four storey Victorian properties and a few commercial units.

Located to the south west of the site is Lots Road Power Station which is currently being redeveloped, including land to the south of Chelsea Creek. This will become residential accommodation and will also have commercial and community uses.

To the east of the pumping station and outside the site boundary is the Station House. This is a four storey red brick building, historically built as the ‘Chief Engineer’s house’ and remains associated with the pumping station.

Beyond Station House is Chelsea Wharf, which includes the original 19th Century warehouse building that has been converted and extended for commercial and residential uses. To the east and north east lies Cremorne Gardens and the Cremorne Riverside Centre.

Chelsea Academy, a secondary school, is located approximately 250m to the southwest of the site along Lots Road. Based on the initial construction layouts, the nearest residential properties are located immediately to the east of the site at Chelsea Wharf and properties along Lots Road.

In addition to its safeguarded wharf status, the site is covered by a number of other planning and environmental designations in The Royal Borough of Kensington and Chelsea Consolidated Local Plan, July 2015. There is a designated Employment Zone (Lots Road Employment Zone) and safeguarded waste use on the site. The site is also located within Flood Zone 2 and 3.

The Thames Path currently runs to the east of the site along Lots Road. The Royal Borough of Kensington and Chelsea proposals map includes a proposed extension to the Thames Path across Cremorne Gardens and then along the southern boundary of Chelsea Wharf and Cremorne Wharf adjacent to the River Thames. The site is also located within the Thames Policy Area.

The site includes the existing jetty at Cremorne Wharf and our proposals include a temporary deck in the River Thames. This part of the site that extends into the River Thames is designated as a Nature Conservation Area, and along its foreshore adjacent to the site the River Thames is designated as a Site of Metropolitan Importance and a Green Corridor. Cremorne Wharf depot and Lots Road pumping station are located within the Lots Village Conservation Area. The existing jetty and foreshore is located in the Thames Conservation Area.

Related documents:

• Environment• How we would build the proposed storm

relief sewer

How we chose this siteWe’ve carried out a detailed site selection process to assess and identify the most suitable locations for the range of construction sites required to deliver the proposed storm relief sewer.

This process takes into account the community, property, environment, transport, engineering and planning, issues relevant to the selection of the most suitable combination of sites. In particular, public and stakeholder feedback received over the past year has influenced the selected sites and the way we propose to use them.

The site has a number of benefits in relation to the construction of the storm relief sewer including:

• Its proximity to the Walham Green storm relief sewer and Low Level No.1 sewer

• Its suitability for interface with the Thames Tideway Tunnel

• Its status as a safeguarded wharf which enables excavated material to be taken by barge saving on the movement of heavy goods vehicles.



The alternative sites we looked atThe alternative drive sites considered at this location through our phase 1 and interim engagement processes are shown in Figure 2. The main reasons for not taking them forward are listed below:

Kensington Olympia car parkConsidered as the preferred drive site during the first phase of site selection work.

• Reason: This site would have required the use of the whole car park leading to a significant impact on the business of Kensington Olympia. The landowner also confirmed this site is not available for use as a drive site because of the planned increase in usage of the car park for events at Kensington Olympia.

• Following phase 1 of our consultation, in February 2015, Crossrail 2 revised its safeguarded route in Chelsea, allowing us to reduce the depth of the proposed storm relief sewer and drive the full length of the storm relief sewer from Cremorne Wharf Depot as we no longer need to change the level of the tunnel. At this point Cremorne Wharf Depot became a more practical and viable proposition for a drive site when compared with the Kensington Olympia car park site.

St Paul’s GardensConsidered as an alternative drive site during the first phase of site selection work.

• Reason: This site would have resulted in the temporary loss of open space and the north walls to the site were a concern as listed as Grade II. The site would also be reliant on road transport, whereas other sites could use alternative transport modes e.g. Cremorne Wharf Depot can use river freight.

Westfield ParkConsidered as an alternative drive site during the first phase of site selection work.

• Reason: The site was rejected at the Site Suitability Reporting stage as it was considered unsuitable on the basis of unacceptable townscape and visual impacts.

Cremorne Gardens (to be used in conjunction with Cremorne Wharf Depot) Considered as an alternative drive site during the first phase of site selection work.

• Reason: The site was rejected at the Site Suitability Reporting stage as it was considered unsuitable from an environmental perspective due to the loss of trees and communal space in Cremorne Gardens, with townscape and visual impacts.

Gwendwr GardensConsidered as an alternative drive site during the first phase of site selection work.

• Reason: The site was rejected at the Site Suitability Reporting stage as it was considered unsuitable from an environment perspective on the basis of unacceptable townscape and visual impacts and from a socioeconomic and community perspective.

Related documents:

• How we chose our preferred sites• Tunnel drive strategy

What we are proposing at this siteTaking previous feedback and the issues relating to alternative sites into account, Cremorne Wharf Depot, Lots Road is the most suitable location for the main drive site to facilitate the tunnelling of our proposed new storm relief sewer and for the work to intercept the Walham Green storm relief sewer and Low Level No.1 sewer.

The Thames Tideway Tunnel includes work at Cremorne Wharf Depot to control the Lots Road combined sewer overflow. Following phase 1 consultation we continued to investigate the potential interaction between the Counters Creek storm relief sewer and the Thames Tideway Tunnel at Cremorne Wharf Depot. The proposals of how they work together are explained below.

Tideway will build the following structures under the Development Consent Order as part of the Thames Tideway Tunnel:

• Interception chamber on the existing Lots Road Pumping Station CSO and transfer of flows through a culvert into a shaft (referred to as Shaft No.1 in Figure 1).

• Shaft No.1 where the flows from the culvert are dropped to a deeper level.

• Tunnelled connection from the Shaft No.1 to the Thames Tideway Tunnel.

Thames Water will build the following structures as part of the Counters Creek Flood Alleviation scheme:

• Shaft No.2 in Figure 1: The new Counters Creek storm relief sewer (which carries the flows intercepted within its catchment) .

• Two interception chambers: As indicated in Figure 1, there will be two interception chambers on the south


western access to Cremorne Wharf. One chamber will be on the Low Level No.1 sewer and the other on the Walham Green storm relief sewer. These will enable the transfer of the intercepted flows into Shaft No.3.

• Shaft No.3: The flows entering this shaft will be dropped to a deeper level and then connect to Shaft No.2 where they join the flows from the new Counters Creek storm relief sewer.

Shaft No.2 will be connected to to the Thames Tideway Tunnel drop shaft (Shaft No.1) via a short connection tunnel. In Shaft No.1 the combined flows from Shaft No.2 will join the intercepted flows from Lots Road Pumping Station CSO. All flows from Shaft No.1 will then go into the Thames Tideway Tunnel via the connection tunnel mentioned above under the Tideway proposal.

There will be flow control devices within Shaft No.2 whereby the combined flow passed forward into the Thames Tideway Tunnel shaft (Shaft No.1) is controlled. This means that in heavy rains, the flows would be held back (i.e. stored within the Counters Creek tunnel) and passed forward to the Thames Tideway Tunnel shaft in a controlled manner such that the Thames Tideway Tunnel can continue to control the Lots Road Pumping Station CSO and transfer the captured flows to Beckton Sewage Treatment Works.

• Air management chambers and ventilation columns: Two ventilation columns are presently on our design proposals in Figure 9. One is part of the Thames Tideway Tunnel. We are proposing to combine these two stacks into one if possible. Further details of this will be presented with the planning application.

An alternative would be to not build Shaft No.3 and relocate Shaft No.1 to Shaft No.3 location. This alternative could mean that Shaft No.2 may need to increase in diameter to accommodate the flow drop structures for flows intercepted from Lots Road Pumping Station CSO as well as the flow control devices.

The existing Lots Road pumping station and outfall would remain. Following the implementation of the integrated solution, the station will operate infrequently under severe storms, only if both the Counters Creek storm relief sewer and Thames Tideway Tunnel become full. The station will discharge the excess storm flows into the river in line with the present Thames Tideway Tunnel predictions. The existing station is old with obsolete equipment. It is proposed to refurbish the station as part of a separate scheme.

It is proposed for Shaft No.2 to accommodate pipework for temporary pumping facilities with a pipework and valve chamber next to it. This means that if the Thames Tideway Tunnel is not complete after the Counters Creek project, temporary pumps can be hired in and deployed to work together with the existing pumping station to pump the storm flows into the existing sewer network and the River Thames (similar to the proposal in phase 1 consultation) until the Thames Tideway Tunnel becomes operational.

Both the Thames Tideway Tunnel and the Counters Creek storm relief sewer are envisaged to shut down once every ten years at the same time for inspection. Such an activity would be planned in advance for dry periods as far as foreseeable.

Figure 2 Alternative sites considered to Cremorne Wharf Depot, Lots Road



In order to facilitate barge movements, we will remove the existing jetty and create a temporary platform over the river. We will reinstate access to the wharf following construction to reflect the requirements of the site’s safeguarded wharf status.

Following construction we will leave above ground permanent infrastructure including manhole covers and ventilation columns. More details can be found in Section 4. .

How our proposals for this site have changed since we last consulted on themThe landowner at Kensington Olympia confirmed the site is not available for use as a drive site because of the planned increase in usage of the car park for events at Kensington Olympia. Also, Crossrail 2 revised its safeguarded route in Chelsea, which allows us to reduce the depth of the proposed storm relief sewer and drive the full length of the storm relief sewer from Cremorne Wharf Depot as we no longer needed to change the level of the tunnel.

At phase 1 consultation we proposed to use Cremorne Wharf Depot for the interception of the Walham Green storm relief sewer and Low Level No.1 sewer and to receive the tunnel boring machine which was proposed to be driven from Kensington Olympia car park. Cremorne Wharf was also proposed as the site from which excess storm flows could either be pumped back into the existing network and onwards to Beckton Sewage Treatment Works or in extreme storm conditions pumped into the River Thames. Therefore, a new pumping station and combined sewer outfall was also proposed at Cremorne Wharf.

The Port of London Authority (PLA) has stated that it is supportive of the Cremorne Wharf site utilising sustainable transport links via the River Thames while Transport for London (TfL) have also indicated they are supportive of the use of the site if there is a possibility it will reduce the overall construction impact.

Cremorne Wharf is a safeguarded wharf under part of the London Plan’s Policy 7.26. The PLA indicated that they were supportive of the Policy and expressed concerns about the wharf’s viability following construction of the new pumping station and outfall. The PLA also expressed concerns with respect to using the Kensington Olympia car park as the main drive site. The PLA supported the use of Cremorne Wharf as tunnel construction site as this could utilise sustainable transport links via the River Thames. The PLA indicated that the use of the river for the transportation of materials would significantly reduce congestion on the roads surrounding Kensington Olympia car park and would be in line with London Plan Policy 7.26, which seeks to increase the use of the blue ribbon network for freight transport.

The Thames Tideway Tunnel is a major infrastructure project which will tackle the current problem of combined sewer overflows (CSOs) discharging untreated sewage into the tidal River Thames during wet weather. The Thames Tideway Tunnel will capture the overflow discharges and transfer these for treatment at Beckton Sewage Treatment Works. The existing Lots Road Pumping Station CSO is one of the CSOs being controlled by the Thames Tideway Tunnel. In addition to the PLA’s concerns mentioned above, the Environment Agency (EA) indicated that they would not support the creation of a new outfall on the tidal Thames if this was likely to affect the predicted performance of the Thames Tideway Tunnel.

The new proposal at Cremorne Wharf includes an integrated solution between the new Counters Creek storm relief sewer and the Thames Tideway Tunnel. Under this proposal there would be no new permanent pumping station and no new outfall at Cremorne Wharf as proposed under the phase 1 consultation. In addition, Cremorne Wharf is proposed to be the main drive site for the construction of the tunnel, thereby enabling river transportation of materials by barge.

Related documents:

• Have your say• How we chose our preferred sites


Section 2: Construction

Construction activitiesWe would drive the tunnel boring machine from this site, creating a 5.1km long and 4m internal diameter tunnel. We will construct a number of shafts including the connections to the Walham Green storm relief sewer and the Low Level No.1 sewer. We would also need to create a connection to allow us to pump back into the Low Level No.1 sewer, which will mean digging up a small section of Lots Road.

We would demolish the existing jetty, construct a temporary deck in the river and provide two campsheds (a level and hardened bed on the foreshore onto which a barge can sit during low tide, ensuring stability and preventing suction from holding the barge down when the tide rises). We will also provide some temporary protection (like a section of concrete) to the foreshore area in front of the existing Lots Road CSO outfall where flows are discharged into the river. We will dismantle this deck and reinstate the jetty at the end of the work. We will reinstate access to the Wharf following construction to reflect the requirements of the site’s safeguarded wharf status.

Following completion of construction work, there will be control equipment which will need to be housed within one or more kiosks. We will accommodate these within the existing Lots Road pumping station. As this is a listed building, Historic England will be consulted and Listed Building Consent sought as required. There will be manhole and access covers at ground level and the only above ground structure will be the ventilation column. We will bring an electrical cable for power supply to the site. The electrical power will be used for construction. It is proposed to retain the power supply on site following

construction for use within the existing pumping station or for temporary pumping when Thames Tideway Tunnel is unavailable (for example if Thames Tideway Tunnel is not complete after Counters Creek).

For all construction activities further environmental assessments are being carried out and will be reported in the Environmental Statement which will accompany our planning applications.

Construction phasesWe expect construction here to take approximately four years. The main stages of construction are shown in Figure 3.

2017 2018 2019 2020

Drawing Phases

Main stages of construction Q1 Q2 Q3 Q4 Q1 Q2 Q3 Q4 Q1 Q2 Q3 Q4 Q1 Q2 Q3 Q4

Advance works

1 Site set up

1 Shaft sinking

2 2a

Tunnel driveWork in Lots Rd (SW)

3 Shaft internal works

4 4a

Permanent worksWorks to Lots Rd (NE)

Site reinstatement

* Completion is targeted for 2020 but we are working to finish earlier. ** The dates are indicative and subject to further considerations in consultation with Tideway and landowners.***The small area shown within Lots Road in Figure 5b and 5d, site layouts Phase 2 and 4, is the extent of the area needed for work in Lots Road. During these construction periods, the parking suspensions will be as shown in Figure 8 Phases 2a and 4a respectively.

Figure 3 Site construction phasing



Typical working hoursThe following working hours are proposed and shown below:

Main stages of construction

Days Hours of work

Site establishment, piling, fit out, finishings and demobilisation

Monday to Friday 07:00 to 19:00

Saturday 07:00 to 13:00

Sunday No work

Shaft sinking, tunnelling and finishings. Barge operations.

Monday to Sunday

24 hours

Figure 4 Proposed working hours

We will agree working hours with the Local Authority. It is likely for a 7am to 7pm dayshift, the first hour would be the ‘start up’ and the final hour ‘close down’, with ‘noisy’ activities limited to 8am to 6pm. We will put in place appropriate mitigation measures to reduce noise and prevent disturbance where practical.

These will include using quieter plant and equipment, locating louder activities away from neighbouring properties where possible and designing additional site hoardings to limit noise.

To allow for continuous tunnelling which reduces the risk of ground movement, the site will be operational 24 hours a day throughout the majority of this construction period.

We will enclose the immediate working area around the shaft in a temporary, purpose-built building when carrying out shaft sinking, tunnelling, and finishing works. This will limit noise, dust and light disturbance.

Barge loading would take place during tunnelling hours to suit the generation of excavated material from the tunnels and shafts. Barge movements would need to take place to suit the tide and could be at any time, 24 hours a day 7days a week, subject to authorisation from the Local Planning Authority and the Port of London Authority.

Site layoutThe indicative site layout has been designed according to the size of the infrastructure proposed, the construction methods required and the location of the neighbouring buildings and structures. It has also been developed to minimise effects on the local community and environment.

The indicative site layouts, a version of which is provided in Figures 5a-d and more details of which are provided at our drop-ins and online, show our current proposals. The details may still change in light of feedback from our phase 2 consultation.

Wandsworth

Kensington &Chelsea

Hammersmith& Fulham

Hyde Park

CremorneWharf

WormwoodScrubs

BatterseaPark

Westminster

CONCEPT DESIGN DRAWINGS. ALL LAYOUTS AND DETAILSLIABLE TO CHANGE AS THE DESIGN DEVELOPS.ALL MEASUREMENTS IN mm UNLESS OTHERWISE STATED.ALL LEVELS IN METRES ABOVE ORDNANCE DATUM.

THISDRAWING

LOTS R

OAD

AS HBUR NHAM R OAD

CHEL SEA WHARF

MEA

N HIG

H W

ATER

MEAN L

OW

WATE

R

RIVER THAMES

Thames Water Utilities Ltd 2015c

Drawing No:

Drawing Title:

Planning Drawing No:

Project Name:

Site Name:

Location / Town:

Project Group:

Location Code: OS Reference: Security Reference: Drawn By:

Sub Process:

:veR:eziS teehS:elacS

Clearwater CourtVastern Road, Reading RG1 8DB

CAPITAL DELIVERY

Thames Water Utilities

050

100

150

200m

m

Iss Description Dsgnr Chkd Appd Date

654321

A

B

C

D

A1

© COPYRIGHT : UNAUTHORISED REPRODUCTION PROHIBITED.BASED ON THE ORDNANCE SURVEY MAP WITH THE SANCTION

OF H.M. STATIONERY OFFICE - LICENCE No. 100019345.

B

N/A TQ2677 UBR SK

NETWORK WASTEWATER

KENSINGTON & CHELSEACREMORNE WHARF DEPOT

COUNTERS CREEK STORM RELIEF SEWER

TBA PRIOR TO APPLICATION

CREMORNE WHARF DEPOTCONSTRUCTION PHASE 1

C680-A1-03321-DR 1:250

SCALE 1 : 250

0 5 m 20 m 25 m10 m 15 m

JC

SCALE1 : 250CONSTRUCTION PHASE 1

N

JC 51/21/51RDBLE&P YB TNEMMOC ROFA61/10/81RDBLNOITATLUSNOC 2 ESAHPB JC

Chelsea Wharf

Lots

Road

Ashburnham

Road

Figure 5a Indicative site layout - Phase 1

Key

Maximum extent of phase incorporating site hording

Site support/welfare

Excavated material storageand processing

Maintenance workshop and storage

Construction support

Internal site road

Site access

Noise enclosure

Demolition works


Wandsworth

Kensington &Chelsea

Hammersmith& Fulham

Hyde Park

CremorneWharf

WormwoodScrubs

BatterseaPark

Westminster


THISDRAWING

KEY

MAXIMUM EXTENT OF PHASE INCORPORATINGSITE HORDING

SITE SUPPORT/WELFARE

EXCAVATED MATERIAL STORAGE ANDPROCESSING

MAINTENANCE WORKSHOP AND STORAGE

CONSTRUCTION SUPPORT

INTERNAL SITE ROAD

SITE ACCESS

NOISE ENCLOSURE

DEMOLITION WORKS

LOTS

ROAD

ASHBURNHAMROADCHELSEA WHARF

MEA

N HI

GH W

ATER

MEAN

LOW

WAT

ER

RIVER THAMES


Drawing No:

Drawing Title:


Project Name:

Site Name:

Location / Town:

Project Group:


Sub Process:



CAPITAL DELIVERYThames Water Utilities

050

100

150

200m

m


654321

A

B

C

D

A1



B

N/A TQ2677 UBR SK

NETWORK WASTEWATER





C680-A1-03322-DR 1:250

SCALE 1 : 250

0 5 m 20 m 25 m10 m 15 m

N



Substation

Chelsea Wharf

Lots

Road

Ashburnham

Road

Figure 5b Indicative site layout - Phase 2

Wandsworth

Kensington &Chelsea

Hammersmith& Fulham

Hyde Park

CremorneWharf

WormwoodScrubs

BatterseaPark

Westminster


THISDRAWING

KEY






INTERNAL SITE ROAD

SITE ACCESS

NOISE ENCLOSURE

DEMOLITION WORKS

LOTS

ROAD


MEA

N HI

GH W

ATER

MEAN

LOW

WAT

ER

RIVER THAMES


Drawing No:

Drawing Title:


Project Name:

Site Name:

Location / Town:

Project Group:


Sub Process:




050

100

150

200m

m


654321

A

B

C

D

A1



A

N/A TQ2677 UBR SK

NETWORK WASTEWATER





C680-A1-03323-DR 1:250

SCALE 1 : 250

0 5 m 20 m 25 m10 m 15 m

N


JC 51/21/51RDBLE&P YB TNEMMOC ROFA

Chelsea Wharf

Lots

Road

Ashburnham

Road

Figure 5c Indicative site layout - Phase 3

Wandsworth

Kensington &Chelsea

Hammersmith& Fulham

Hyde Park

CremorneWharf

WormwoodScrubs

BatterseaPark

Westminster


THISDRAWING

LOTS

ROAD


MEA

N HI

GH W

ATER

MEAN

LOW

WAT

ER

RIVER THAMES

KEY






INTERNAL SITE ROAD

SITE ACCESS


Drawing No:

Drawing Title:


Project Name:

Site Name:

Location / Town:

Project Group:


Sub Process:




050

100

150

200m

m


654321

A

B

C

D

A1



B

N/A TQ2677 UBR SK

NETWORK WASTEWATER





C680-A1-03324-DR 1:250

SCALE 1 : 250

0 5 m 20 m 25 m10 m 15 m

N



Chelsea Wharf

Lots

Road

Ashburnham

Road

Figure 5d Indicative site layout - Phase 4

Key

Maximum extent of phase incorporating site hording

Site support/welfare

Excavated material storageand processing

Maintenance workshop and storage

Construction support

Internal site road

Site access

Noise enclosure

Demolition works



Construction traffic routes and accessWe are working with the highways departments of Transport for London, London Borough of Hammersmith and Fulham and Royal Borough of Kensington and Chelsea to confirm the exact construction vehicle route. We are proposing the following routes described below and as shown in Figure 6.

Traffic would approach the site from Cremorne Road A3220, turn onto Lots Road and then left into the site using the north eastern entrance. When this entrance is unavailable during excavation for the discharge pipe to the Low Level No.1 sewer, the south western exit would be used as an entrance.

Traffic would leave the site through the gate to the south west of the existing pumping station on Lots Road. They would turn right onto Lots Road and onto Cremorne Road A3220. When the south western exit is unavailable during construction of the chambers to intercept the overflow from the Low Level No.1 sewer and the Walham Green storm relief sewer, the north eastern entrance would be used as an exit.

To improve access for lorries, we may need to temporarily remove the western end section of the brick wall in front of the pumping station and modify the curve of the pavement line.

Large machines and equipment such as the tunnel boring machine, cranes, and piling rigs may be delivered and collected on low loaders as they’re unable to turn into site. We will agree delivery times with the transport authorities and alternative transport routes would be used. Large vehicles would approach the site from Cremorne Road A3220 from the east and stop at the entrance to Ashburnham Road. Under a road closure and parking suspension for a short period of time, vehicles would reverse down Ashburnham Road, cross Lots Road and access the site.

Construction traffic managementThe following traffic management would be provided:

We will install traffic management at the site to control traffic movements when large vehicles are approaching or leaving site at the junction of Lots Road, Ashburnham Road and the site entrance and exit. This may be either traffic lights or qualified traffic marshals to minimise congestion on the roads.

Lots RoadDuring the work on the interception with the overflow from the Low Level No.1 sewer, we would need to close the westbound lane on Lots Road for approximately five months. Lots Road would also be closed for approximately one month during the discharge connection to the Low Level No.1 sewer. Two-way traffic would be maintained by installing temporary traffic lights.

Ashburnham RoadThere would be closures on Ashburnham Road for a short period of time during the delivery and collection of large items of machines and equipment. We will agree delivery times with the transport authorities in advance.

Figure 6 Construction traffic routes


* Standard working hours: 8am - 6pm Monday to Friday, 8am - 1pm Saturday* Extended standard working hours: 6pm - 10pm Monday to Friday, 1pm - 5pm Saturday

Figure 7 Average daily number of lorries and barges

Advance works Site setup Shaft sinking Tunnel drive Shaft internal works

Permanent works

Site reinstatement

Typical working hours Variable Standard with extended standard

Continuous Continuous Continuous Standard with extended standard

Standard

Utilities diverted and connected ✓

Site clearance ✓

Site facilities ✓

Temporary jetty ✓ ✓

Piling for shafts ✓

Shafts excavated and built ✓

Tunnel drive ✓

Shaft internal works ✓

Connection chambers excavated and built ✓ ✓

Air management works ✓

Temporary jetty removal ✓

Site reinstatement ✓

Average daily number of lorries 3 6 12 10 10 10 4Average daily number of barges 0 1 2 3 1 1 1

Mai

n co

nstr

uctio

n ac

tivity

Construction vehiclesAt Cremorne Wharf Depot, we propose to use the river to transport all of the material that we remove to create the main tunnel from Cremorne Wharf Depot to Tesco Superstore car park, Shepherd’s Bush Road. Our initial estimates indicate this could help us reduce the number of lorry journeys to and from the site by approximately

12,000. We are investigating measures to enable the delivery of tunnel segments to a riverside site where they can be stored, sorted and prepared for onward delivery by barge to Cremorne Wharf Depot. Other materials to and from site would be transported by road. Vehicles entering and leaving site must do so under the direction

of a qualified traffic marshal to make sure there’s no risk to passing traffic, cyclists or pedestrians.

The anticipated average daily number of lorries and barges travelling to and from the site during the peak months of each construction phase are shown in Figure 7.



Section 3: Issues relating to construction

Parking suspensionsAs shown in Figure 8, we will need to suspend some parking on Lots Road to facilitate lorry movements through the site entrance and exit. More parking bays would need to be suspended when work is taking place on the Low Level No.1 sewer in Lots Road.

We will assist with alternative parking where possible. We will carry out parking surveys to identify the parking capacity of the area and see if vehicles can park elsewhere.

Bus services and bus stopsWe do not expect any other bus routes will be affected by the proposals.

Emergency services accessWe will be working with the fire, police and ambulance services to make sure access can be maintained to all properties.

Pedestrian routesWe may need to temporarily close the pavement along the south and east of Lots Road to provide a waiting area for lorries. There would be clear signage to safely direct pedestrians around the parked lorries.

We may need to modify the pavement line on Lots Road by the entrance and exit of the site to improve access to the site for large vehicles.

We may also need to close the pavement along the southern side of Lots Road during the work on the Low Level No.1 sewer. There would be a clearly signed alternative pedestrian route to the north of Lots Road.

5 on-street parking bays







1 on-street parking bay







Phase 1, 2, 3 and 4 Phase 4a

Phase 2a

On-street car parking to remain

On-street car parking to be closed during works

On-street car parking may need to be closed during works

Santander cycle docking stations to remain open

Site boundary

Temporary site boundary

Figure 8 Locations of parking suspensions


Cycling routesIf a full road closure on Lots Road is needed, the National Cycle Route 4 which passes through Lots Road would be diverted. We will work with TfL as our proposals continue to develop and to determine if any cycle diversions are needed and to keep any impacts to a minimum. We do not expect any other cycle routes or facilities, including the Santander cycle stands, would be affected by the proposals.

Access to properties There may be temporary access restrictions to some properties during some phases of construction work. If this should happen, we will notify residents in advance. We will also help with services such as deliveries and bin collections where possible.

Bin collectionsWe do not expect any residential bin collections to be affected.

DeliveriesWe do not expect any deliveries to residents’ properties to be affected.

Health and SafetyWe will make sure we create a safe workplace on and around our site for the public, site neighbours, our employees and contractors. We will regularly audit the site to make sure all activities are in line with our strict health and safety policies.

Noise and vibrationDuring constructionThe site layout is being carefully considered to ensure noisy equipment and construction activities are positioned to minimise impacts. Where possible, we will avoid the use of noisy machines. For instance, we would use power from the electricity grid rather than on-site generators where possible.

We are carrying out noise modelling to predict and mitigate noise impacts from construction activities. Full details will be provided in the Environmental Statement which will accompany the planning application. Our baseline noise monitoring indicates the main source of noise is traffic on Lots Road to the north of the site.

An increase in noise above this baseline is expected at times during construction but we’ll make every effort to reduce the noise impacts on residents. We will place acoustic barriers around the construction site and an acoustic building will also surround the excavation of the shafts where night time working is proposed. Other noise and vibration control measures will be implemented at the site and will be explained in the Environmental Statement.

Continuous tunnelling work is not expected to cause substantial noise or vibration. There may be an increase in noise during some phases of construction work and loading and operation of barges.

Vibrations generated from the tunnelling work are not normally expected to cause any disturbance. If vibration thresholds are breached, we will identify the cause and take appropriate measures to reduce or eliminate the impact.

After constructionWe don’t expect any noise impacts or vibration during operation. We will carry out a full inspection of the main sewer alignment at least once every ten years. With all sewer operations, emergency night time access may be required in the future which may cause temporary noise impacts.

Ecology During construction We expect there will be some limited loss of foreshore habitat for the duration of the construction work but this will be restored afterwards. The noise and vibration from piling operations can cause disturbance to spawning fish but the piling method we’re proposing to use minimises this risk.

After construction We don’t expect any further ecological impacts following construction. We will agree a foreshore restoration plan with the Royal Borough of Kensington and Chelsea which will set out the ecological mitigation necessary to restore the site.



Dust Dust control measures will be put in place including:

• Additional screening of construction activities known to generate dust

• Sealing dust generating surfaces, for example stripped soil and sandy surfaces

• Regular road sweeping where possible• Water sprinklers and wheel washers to reduce

dust transferWe will carry out dust monitoring on the construction site while work is taking place, the details of which will be agreed with The Royal Borough of Kensington and Chelsea Environmental Health Officer.

Air qualityWe have agreed air quality monitoring locations with the Royal Borough of Kensington and Chelsea Environmental Health Officer and the findings will be reported as part of the Environmental Assessment. The monitoring will be part of an air quality assessment which will determine what appropriate mitigation measures we will need to reduce any air quality impacts. These measures may include:

• Making sure all vehicles and machine engines are switched off when not in use

• Using low emission vehicles and machines• Minimising construction vehicle movements

It is unlikely there will be any negative impacts on air quality during the construction phase or operational phase with appropriate mitigation in place.

Our baseline air quality monitoring has identified the main source of air pollutants is exhaust emissions from vehicles on the A3220 Cremorne Road and Lots Road.

Odour During constructionThere may be some odour for a short period of time during the interception work with the existing sewers.

After constructionThe air management chamber will contain carbon filters which will mitigate the potential for odour release. A ventilation column will also be constructed to disperse the released air. Air dispersion modelling will be used to optimise the height, size and location of the ventilation column. Two ventilation columns are proposed (one being part of the Thames Tideway Tunnel). Combining these two ventilation columns is being investigated.

LightingTemporary lighting will be provided during the construction phase for safety and security reasons. Potential impacts of lighting on ecology and townscape will be considered as part of the Environmental Assessment.

Lighting will be required during construction work depending on daylight conditions. Lights would be positioned on posts and face downwards, away from the windows of residents. We will need lighting on smaller stands for task specific work. These lights will be switched off at the end of the working shift.

Additional lighting will be installed around the site boundary, wherever the site’s hoarding blocks street lighting. These lights will be turned on at dusk and remain on throughout the night. If a pavement is permanently dark, these lights will remain on at all times.

Related documents:

• Being a good neighbour• Environment• How we would build the proposed storm

relief sewer• Transport


What we will leave at the siteThe site would need permanent below and above ground structures. Designs of permanent above ground structures will still to be confirmed. We want to know what you think of these proposals for this site and how it would look after we have finished construction.

Manhole coversAll below ground structures will have manhole covers at ground or road level. These will include:

• Access covers• CCTV inspection covers• Materials and man rider access covers• Maintenance access for safety grilles• Access covers for temporary pumping facilities• Isolation gate access covers• Instrumentation and monitoring covers• Air treatment drainage manhole covers • Air management hatch coversNext to the tunnel boring machine drive shaft, there will be a valve chamber approximately 6m long, 4m wide and 3.5m deep. It is estimated that the following covers would remain permanently on the surface:

• Ladder access covers• Maintenance access coversWe will also need to install manhole covers for the connection shafts to the existing sewers. It is estimated these will include:

• Access cover

• Penstock covers• Ladder, materials and man rider access coversVentilationPassive ventilation is proposed for this site and the air management equipment is expected to include a below ground reinforced concrete box approximately 7.7m long, 4m wide and 4.5m deep. The below ground

structure would include the high pressure emergency relief dampers, access ducting, carbon panel filters and air sampling points. The ventilation column would be no greater than 0.9m diameter and up to 6m high. There will be another ventilation column as part of the Thames Tideway Tunnel and we are investigating opportunities to combine the two columns. It is estimated the following

Section 4: After construction

Figure 9a Cremorne Wharf on Lots Road



Lots

Road

Ashburnham Road

Shafts and connection culverts located below ground

6m high ventilation columns split into sculptural elements

Jetty reinstated

Blue zone for reinstated depot building (by others)

Lots Road Pumping Station

Cremorne Wharf

Cremorne Wharf Depot

covers would also need to be installed:

• Access covers• Damper access cover and carbon filter access cover• Filter media access covers• Fire suppression covers

KioskTo operate the mechanical equipment installed at the site, Glass Reinforced Plastic (GRP) kiosks measuring a maximum of 2m x 1.5m x 2m high would also be installed above ground to house telemetry, and control panels for the penstock operation. As mentioned earlier, we will be using the existing Lots Road pumping station

to house such kiosks and equipment. Lots Road Pumping Station is a listed building and details will need to be agreed with Historic England.

Operation and maintenanceMaintenance access would be required at all chamber locations, below ground structures, kiosks and weir structures. A full inspection of the main sewer alignment is expected to be required at least once every ten years. We would need to use mobile cranes and support vehicles to make sure this operation is carried out safely.

In addition, regular operation and maintenance of penstocks and ancillary equipment would be required on a more frequent basis, and access would be needed on a six monthly basis.

The filter media would be changed as and when required. This would be dependent on the sampled air leaving the chamber, monitored at regular intervals. It is expected that replenishing/replacement of the carbon filters would be once every three years. A number of these maintenance visits would be scheduled to coincide with each other.

Maintenance access would require vehicular access to the site. The number of vehicles and personnel required would depend on the timing and type of operational activity being carried out. With all sewer operations there is a probability that night-time access may be required in the future.

Figure 9b An artist’s impression of the site - after the works are completed


Your comments on our proposals will help us to understand the local issues that matter to you. We will look carefully at all comments and make changes to improve our proposals where possible.

You can send us your comments in the following ways:

• Visit our website thameswater.co.uk/counterscreek and complete our online feedback form.

• Pick up a paper feedback form and freepost envelope from one of our drop-ins or call us on 0800 316 9800 to request one.

• You can send us your comments by email to [email protected]

• You can also send us your comments in a letter to: Counters Creek sewer flooding alleviation scheme consultation Freepost RTHE-CJYY-CXCJ 7 St Peter Street Winchester SO23 8BW

Tell us what you think



This section provides details of the other consultation documents that you may find particularly useful.

Phase 2 public consultation materialsThere are 12 additional documents set out in the table to the right that may be of particular interest. They explain general topics relating to the Counters Creek sewer flooding alleviation scheme.

Further information on our proposals can be found on our website at thameswater.co.uk/counterscreek

Email us at [email protected]

Call us on 0800 316 9800 and select option 2 and quote reference number BB 968577

Follow us on Twitter @CountersCreek

Further information

Title DescriptionBeing a good neighbour Includes information on what measures we will put in place at our sites during

construction to minimise disruption. Environment Sets out the process the project is following to assess potential environmental effects

of the Counters Creek scheme.Feedback from our phase 1 consultation and engagement process

Summarises feedback received from our phase 1 consultation and interim engagement.

Getting planning permission Explains the stages of planning application process from our phase 2 consultation through to a decision being made on our application.

Have your say Shows where you can find further information and provide feedback on our proposals.How we chose our preferred sites

Sets out the process we followed to find our preferred sites.

How we would build the proposed storm relief sewer

Provides information on the different types of sites required for the Counters Creek scheme and the typical construction activities that will be undertaken at each site.

Site suitability report (SSR) Provides an assessment of the opportunities and constraints associated with developing the site for the storm relief sewer.

Timing Describes the next steps following our phase 2 consultation from submitting our planning application to the end of construction.

Transport Contains information on the different transport options we have considered for delivering and removing materials from our sites.

Tunnel drive strategy Describes how we will drive the tunnel boring machine and create the storm relief sewer.

Why we need the Counters Creek storm relief sewer

Explains why we are proposing the sewer flooding alleviation scheme and outlines the problems with sewer flooding in the area.


Project contact details:

Web: www.thameswater.co.uk/counterscreek

Email: [email protected]

Phone: 0800 316 9800

Postal address: Counters Creek sewer flooding alleviation scheme consultation, Freepost RTHE-CJYYCXCJ, 7 St Peter Street, Winchester SO23 8BW

Related documentsThe following documents are available at our drop-in sessions and to download from the document library on our website - www.thameswater.co.uk/counterscreek

Phase 1 consultation and engagement process• Feedback from our phase 1 consultation and

engagement process• Phase 1 Consultation and Engagement Process

Feedback Report

Project information• Being a good neighbour• Environment• Getting planning permission• Have your say• How we chose our preferred sites• How we would build the proposed storm relief sewer• Transport• Timing• Tunnel drive strategy• Why we need the Counters Creek storm relief sewer

Site information• Land adjacent to Talgarth Road and Trevanion

Road, Hammersmith• Maclise Road car park and woodland adjacent to

Kensington Olympia Station• Holland Villas Road at its junction with Lower

Addison Gardens• Tesco Superstore car park, Shepherd’s Bush Road

Site Suitability Reports• Cremorne Wharf Depot, Lots Road, Chelsea• Land adjacent to Talgarth Road and Trevanion

Road, Hammersmith• Maclise Road car park and woodland adjacent to

Kensington Olympia Station• Holland Villas Road at its junction with Lower

Addison Gardens• Tesco Superstore car park, Shepherd’s Bush Road

Documents

Cremorne Wharf Depot, Lots Road, Chelsea - Thames … · Cremorne Wharf Depot, Lots Road, Chelsea ... Approximate length of time of construction Four years ... with a single lane