Putney Bridge Foreshore

Introduction 1

Wandsworth Bridge Putney to approximately 68,000m³ (equivalent 27 Olympic swimming pools) CSO site and a half years. three Approximately Thames Tunnel Thames

Putney Bridge Foreshore Foreshore Bridge Putney Key facts Key authority: Local CSO name: year: in an average CSO spill volume Site type: works: of main construction Duration Currently, untreated sewage regularly overflows into the River Thames from London’s Victorian sewerage system sewerage Victorian London’s from Thames River the into overflows regularly sewage untreated Currently, the through overflows these would intercept Tunnel Thames (CSOs). The proposed overflows sewer via combined Station. The Mills Pumping London and Abbey link west tunnel, which would and transfer storage use of a new reduction Tunnel. The Works via the Lee Treatment to Beckton Sewage would then be transferred flow sewage users of and for the environment benefits bring long-term Thames would entering the River sewage in untreated and this document need a number of sites along the route we the project to deliver Thames. In order the River Foreshore. Bridge Putney site at preferred identifies our current

Site information paper Putney Bridge Foreshore

Section 1: Introduction and site information We are proposing to use the foreshore of the River This site information paper sets out our proposals at Thames, to the west of Putney Bridge, for this Putney Bridge Foreshore. We have also produced project construction work and to accommodate permanent information papers, which cover overarching topics structures required to operate the main tunnel. The site relating to the project. Where we consider that a project would be used to connect the existing local CSO, known information paper is particularly relevant, we have as the Putney Bridge CSO, to the main tunnel. highlighted this in a related documents box. At the end of this site information paper is a list of other documents, The location of the site is shown in Figure 1A. The site is which may be of interest and a glossary of terms. located in the foreshore of the River Thames, between Putney Pier and Putney Bridge. It is also north of the junction of Lower Richmond Road and Embankment. The site is within the Putney Embankment Conservation Area. Beyond Lower Richmond Road to the south are residential Related documents: properties. To the south east is Putney High Street (A219) and Grade II* listed St Mary’s Church. The site includes Build the existing slipway, which is located to the west of Putney Bridge.

A temporary, replacement slipway would be constructed for the duration of our Putney Bridge CSO construction works. This would be located approximately 300m west of Putney Bridge, close to the business premises of Chas Newens Marine. The location of the replacement slipway is shown in Figure 1A.

2 Introduction

Draft limit of land to be acquired or used Proposed tunnel route – centreline HAMMERSMITH & FULHAM Local authority boundary Existing sewer

Embankment Existing CSO Putney Pier

Lower Richmond Road

Putney Bridge Putney Bridge CSO

Waterman’s Green St Mary’s WANDSWORTH Church

t e e r t S Putne h y Bridg

y Hig e R oad

Putne N

Figure 1A: Putney Bridge Foreshore location plan

3 Putney Bridge Foreshore

How we chose this site

What we proposed at phase one consultation What we are proposing at phase two consultation Through our site selection process, we identified four We have considered the comments from phase one possible shortlisted sites to intercept the Putney Bridge consultation, feedback from ongoing engagement and CSO. At phase one consultation, which was held between new information; and undertaken further technical work. September 2010 and January 2011, we presented these We still consider that Putney Bridge Foreshore upstream sites: of Putney Bridge, should be our preferred site because it would not have a direct effect on the setting of the Grade • Foreshore, end of Brewhouse Lane II* listed St Mary’s Church, it would have better vehicular • Foreshore, adjacent to Putney Bridge and access than the sites to the east and would avoid a St Mary’s Church pedestrian area. • Junction of Lower Richmond Road and Putney Embankment • Putney Bridge Foreshore. The location of the site is restricted by the configuration Related documents: of the Putney Bridge CSO, which splits into two outlets beneath the southern arch of the Putney Bridge. Since Q&A Consultation both outlets need to be intercepted, the interception point cannot be located inland and therefore a site in the foreshore of the River Thames is required. Site selection Putney Bridge Foreshore was identified as our preferred site at phase one consultation.

4 Construction

Section 2: Construction Construction activities Construction activities are required to intercept the Figure 2A illustrates the below ground infrastructure CSO. We would construct an interception chamber to proposed. These activities would take place within the intercept the CSO. A connection culvert would link the area indicated by the red line in Figure 1A, in five main interception chamber to a drop shaft (approximately phases, lasting approximately three and a half years in 37m deep) through which flows would pass down to total. The main construction activities at this site are set a short connection tunnel. This would then join to the out in Table 2.1. main tunnel.

Connection culvert Existing overflow sewer Construction

Short connection tunnel Valve chamber

Existing Interception overflow to river chamber Drop shaft

Main tunnel

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

5 Putney Bridge Foreshore

Phase 1

Advance works Site setup

Table 2.1: Main activities during construction phases Figure reference Figure 2C Figure 2D Typical working hours Varies Standard Utilities connected ü Utilities diverted or protected ü Temporary slipway constructed ü Site cleared ü Temporary works in River Thames constructed ü Site facilities and access set up ü Drop shaft excavated and built Short connection tunnel excavated and built Above and below ground structures constructed Mechanical and electrical equipment installed Temporary works in the River Thames removed Main construction activities Main construction Temporary slipway removed Site restored and landscaped Temporary site facilities removed

Our typical working hours are expected to be: * Standard working hours would also include, subject to Standard: 8am-6pm weekdays, 8am-1pm Saturday* agreement with the local authority: – a short period (up to one hour) before works start and Extended standard: 6pm-10pm weekdays, 1pm-5pm Saturdays after they have finished to allow our workers to Continuous: 24 hours a day, seven days a week** prepare for work and check the site. Varies: Working hours for advanced works will – equipment and machinery maintenance could also depend on the nature of the works and will take place 1pm-5pm Saturday and 10am-4pm be agreed with the local authority Sunday. ** The main activities taking place 24 hours a day are below ground or within an enclosure.

6 Construction

Phase 2 Phase 3 Phase 4 Phase 5 Drop shaft Tunnelling Construction Completion of construction of other works and site structures restoration

Figure 2E Figure 2E Figure 2F – Standard Continuous Standard Standard

ü ü ü ü ü ü ü ü

Related documents:

Build Managing construction

7 Putney Bridge Foreshore

Site layout and construction phases Figures 2C, 2D, 2E and 2F show how the site might be • Since phase one consultation, this site has moved laid out during the construction phases, which are set further west, away from Putney Bridge, to ensure out in Table 2.1 and Figure 2B. These layouts have been the listed bridge is protected. Moving the site further informed by the size of the infrastructure proposed, west also allows us to minimise the footprint of the the construction methods required and the location permanent works after construction and retain the of neighbouring buildings and structures. They have alignment of the existing slipway. also been developed to minimise effects on the local The site layouts are indicative only, and the contractor community and environment. Particular factors at this site may arrange the site in a different way, depending on that have influenced the layout are as follows: the chosen construction methods, provided that any • Since phase one consultation, a temporary replacement environmental effects are appropriately managed and slipway is now proposed upstream of the site, that the main construction activities are undertaken approximately 300m west of Putney Bridge, to ensure within the red line shown in Figure 1A. that recreational and commercial river users are not adversely affected during construction. Year 1 Year 2 Year 3 • Timber hoarding is proposed on Waterman’s Green to limit our worksite to the western part and provide

protection from construction for users of Waterman’s Advance works P1 P3 P5 Green. The vaults emergency access would be P2 P4 maintained and their use unaffected should existing planning permissions to convert them into cafes or restaurants be implemented. Figure 2B: Construction timeline showing approximate duration of works in phases (P)

8 Construction

HAMMERSMITH & Maximum extent of FULHAM construction site for advance works Jack up barge servicing Site hoarding piling operations Cofferdam Temporary Local authority boundary cofferdam to enable construction Site support/welfare of slipway Internal site road Site access Slipway Existing Thames Path Thames Path diversion

WANDSWORTH

Figure 2C: Illustrative advance works construction plan

9 Putney Bridge Foreshore

HAMMERSMITH & Maximum extent of FULHAM construction site for phase 1 Site hoarding Cofferdam Barge Local authority boundary Jack up barge Site support/welfare servicing piling operations Site access Existing Thames Path Thames Path diversion

WANDSWORTH

Figure 2D: Illustrative phase 1 construction plan

10 Construction

HAMMERSMITH & Maximum extent of FULHAM construction site for phases 2 and 3 Site hoarding Option for contractor Cofferdam to transport materials using barges Local authority boundary Site support/welfare

Cranes Excavated material storage and processing Maintenance workshop and storage Construction support Internal site road Drop shaft Site access Existing Thames Path Thames Path diversion WANDSWORTH

Figure 2E: Illustrative phases 2 and 3 construction plan

11 Putney Bridge Foreshore

HAMMERSMITH & Maximum extent of FULHAM construction site for phase 4 Site hoarding

Option for contractor Cofferdam to transport materials Local authority boundary using barges Site support/welfare Cranes Excavated material storage and processing Maintenance workshop and storage Internal site road Site access Existing Thames Path Drop shaft Thames Path diversion

WANDSWORTH

Figure 2F: Illustrative phase 4 construction plan

12 Construction

Additional works and activities The main construction activities at this site are set out in Table 2.1. We would also need to undertake additional works 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 Installation of equipment to monitor The locations of monitoring equipment would environmental matters such as noise, vibration be agreed with the local authority and relevant and dust. landowners. We would undertake studies to identify any effects our Protection works to third party structures (such construction work may have on third party structures. as buildings, bridges and tunnels). The studies may recommend particular construction methods or, in very limited instances, protection works. If utility diversions are required, we would work with Diversion of utilities. Required for utility providers to undertake the necessary works. construction Temporary connection to utilities (such as We expect to connect to utilities in Embankment or phase water, sewer, phone and electricity supply). Lower Richmond Road. These may need to extend beyond our site and could Traffic management works. include relocating kerb lines, repainting road lines and modifying traffic signals. There is a possibility that as the detailed design is Dredging. developed we may need to undertake dredging to allow barges to get to and from our site. We may need to carry out works to strengthen the Protection of the riverbed. river bed to avoid scour.

Required for Permanent connection to utilities (such as We expect to connect to utilities in Embankment or operational water, phone and electricity supply) for the Lower Richmond Road. phase operational tunnel.

Table 2.2: Additional works and activities

13 Putney Bridge Foreshore

Construction transport and access We propose to use barges to bring in and take away the Construction traffic would access the site from the A3 material used to fill the cofferdam. It is not generally travelling along Putney Bridge Road (A3209) and Putney practical and cost effective to transport all materials High Street (A219). Traffic would then turn left onto to and from the site by barge so we would still need to Lower Richmond Road and right into the site from the transport some materials by road. We would however Embankment. It is proposed to suspend a short section give the contractor the flexibility to determine the most of the existing one way system along the Embankment. practical and cost-effective means of transporting other This would enable construction vehicles to exit the site via materials and equipment. the same route and limit the number of vehicles travelling westbound along the Embankment. Each barge would remove approximately 20 lorries from the road. Using barges at this site would reduce the number of lorry visits to/from this site by approximately 45% (saving 4,500 lorry visits over the construction Related documents: period of approximately three and a half years). Table 2.3 sets out the anticipated average daily number of lorries Transport and barges visiting (ie travelling to and from) the site during the peak months of each phase, based on moving cofferdam fill material by barge.

Phase 1 Phase 2 Phase 3 Phase 4 Phase 5 Site setup Shaft Tunnelling Construction Completion of construction of other works and site structures restoration

Typical daily 8 lorries 7 lorries 5 lorries 15 lorries 10 lorries lorry visits

Average daily 2 barges none none none 2 barges barge visits

Table 2.3: Average daily lorry and barge visits during the peak months

14 Construction

A temporary slipway would be constructed approximately 300m west of Putney Bridge, to provide an alternative access to the River Thames during the construction period. It is proposed that this temporary slipway is removed once construction at the Putney Bridge Foreshore site is completed. During construction of the temporary slipway, construction traffic would access the site by turning right from Lower Richmond Road into Thames Place, and turning right into the site from a new entrance on the Embankment. Traffic would leave the site via the same route. These access points are shown on Figure 2G. 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 on-street parking bays on the Embankment during construction. We may also need to make some minor kerb modifications on the Embankment at the junction with Lower Richmond Road. The Thames Path currently runs around both parts of the site and would remain open throughout the construction works. When we are undertaking our advance works for the temporary slipway, a small diversion that runs across the access to our construction site would be required. Similarly, for the main site, a small diversion would also be required where the Thames Path runs across the site access. The proposed diversions are shown on Figures 2C, 2D, 2E and 2F. Based on our current design, we do not anticipate that any bus stop relocations would be required.

15 Putney Bridge Foreshore

Thames Place Embankment HAMMERSMITH & FULHAM

Lower Richmond Road

Putney Bridge Road

A219 Putney High Street A3209

Right turn in, Embankment Right turn in, left turn out left turn out WANDSWORTH A205 Minor kerb modifications Lower Richmond Road

Embankment A3

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

Draft limit of land to Local authority boundary be acquired or used Transport for London Internal site road (TfL) road network Site access Proposed lorry access to TfL road network

16 Construction

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 Related documents: CoCP Part A: General requirements, informed by CoCPs from other major construction projects in London and consultation with the local authorities. Through the Environment environmental impact assessment process, scheme- wide principles to address potential effects on the local environment have been identified and integrated into Managing construction the design. The CoCP Part A sets out scheme-wide control measures that would be used to minimise potential effects during the construction process. Transport

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.

17 Putney Bridge Foreshore

Issue Our response A temporary slipway would be provided for the duration of construction to provide Temporary loss of historic alternative access to the River Thames. This would be located approximately 300m west public drawdock (slipway). of Putney Bridge. The existing slipway would be reinstated in its original location and condition following completion of construction works. Since phase one consultation, the site has been moved further west. We are continuing to study any potential effects on Putney Pier and to minimise possible effects on vessel movements and navigation to and from the pier. Possible effect of construction activities on We have undertaken modelling to test the effect that the structure has on the flow of Putney Pier. the river. The modelling has shown the proposed structure to be satisfactory and the Port of London Authority and other key stakeholders are satisfied the permanent works have a minimum effect on river navigation. A full navigational risk assessment will be undertaken for the temporary and permanent works. Construction activities could obstruct the During construction, timber hoarding would be put up to exclude the eastern part of the emergency exits from Green from any construction works. The emergency exit from Putney Bridge Vaults onto Putney Bridge Vaults to Waterman’s Green would be maintained. Waterman’s Green. Temporary loss of open With the exception of an area required for a control kiosk and associated ducting, space from Waterman’s construction works at this site would not require the use of the rest of Waterman’s Green. Green. Clearance between construction activities and existing trees would be maximised, and Potential loss of and potential damage further minimised through careful root protection, pollarding and damage to trees along trimming methods. the Embankment and on Waterman’s Green. The permanent electrical and control kiosk has been located near the disused toilet block on Waterman’s Green to minimise the risk of damage to important trees. Possible effect on Grade II listed Putney Bridge We would minimise construction effects on the bridge by reducing the size and height of from construction of the the ventilation column to be constructed, and incorporating it within or attached to the ventilation column for the bridge structure itself. interception chamber.

18 Construction

Issue Our response The Thames Path would remain open throughout construction works, with a small Temporary diversion of the diversion for the length that runs across the access to the construction site. Thames Path and reduced access to the Embankment Only a small section of the Embankment footway would be temporarily closed and during construction. diverted, and access to the Embankment and pier would be maintained during construction. We would manage the effects of road transport through our traffic management plans, Possible effect of which will seek to limit the number of vehicle movements and hours of operation, construction vehicles on identify the most suitable site access points and any necessary highway management the capacity and operation arrangements. As already set out, we also propose to use barges to bring in and take of the local road network. away the material used to fill the cofferdam, which would reduce the number of lorry movements from this site by approximately 45% over the construction period. Temporary suspension The extent and duration of the suspension of any on-street parking during construction or relocation of some would be minimised as far as possible. We are investigating options for temporary on-street parking on the replacement parking provision during construction where necessary. Embankment. Possible effect on the The Boat Race would not be affected by our works, The construction site would not be Oxford Cambridge Boat removed but construction activities would be temporarily suspended. We would also Race and other events. ensure that any barges associated with our works would be removed on Boat Race day.

The contractor would be required to implement noise and vibration control measures Possible effect of noise at the worksite, which will be set out in the CoCP. Continuous tunnelling would only be and vibration on undertaken for a short period of time to construct a connection tunnel from the drop neighbouring areas. shaft to the main tunnel. Preliminary findings indicate that while there is the potential for dust nuisance effects, Possible effects on local air there are unlikely to be any significant local air quality effects at any of the sites. The quality and dust nuisance contractor would put in place air and dust control measures at the worksite, which will be in neighbouring areas. set out in the CoCP. The site footprint within the foreshore is determined by functional requirements for construction. We have however sought to reduce encroachment into the foreshore Possible effects of on as much as possible. Ecological surveys of the River Thames and foreshore are being foreshore habitat and river undertaken to identify possible effects arising from construction activities. The contractor wildlife. would put in place various control measures at the worksite to minimise these effects as far as possible. These will be set out in the CoCP. Table 2.4: Key issues relating to construction

19 Putney Bridge Foreshore

Section 3: Future use

This section describes the site after the completion of the • Underground structures with ground level access covers construction work, ie when the main tunnel is in use – the including: a CSO drop shaft with an internal diameter ‘operational phase’. of approximately 6m, connection tunnel to the main tunnel, connection culvert, interception chamber, valve chamber and a passive filter chamber. Design • A main ventilation column up to 6m high above the Since phase one consultation we have progressed the shaft. design for the permanent use and appearance of the structures at Putney Bridge Foreshore. The design of the • A small diameter ventilation column to the interception permanent proposals follows our scheme-wide principles chamber up to 6m high located on Putney Bridge. and takes into account comments made and ongoing • Maintenance vehicle access. engagement with the London Borough of Wandsworth and other technical consultees. • An electrical and control kiosk. Table 3.1 sets out the site specific issues that have Our permanent works need to incorporate functional influenced our permanent design proposals and how we elements, which are required for the operation of the have addressed them in our proposed design. tunnel. These include:

Issue Our response

Since phase one consultation the proposed hardstanding area has been repositioned further westwards to increase the distance from Putney Bridge.

A potential new public area would be created using the new hardstanding area. Its design would incorporate appropriate materials, furniture and surfacing. This would also be used for Effect on the setting our maintenance access. of the Grade II listed The shape and configuration of this hardstanding area is being designed to reflect its setting Putney Bridge. and to reflect discussions with Design Council CABE, English Heritage, the London Borough of Wandsworth, river users and other stakeholders.

The design of the interception chamber under the bridge and its small diameter ventilation column have responded to stakeholder feedback and their design minimises adverse effects on the bridge appearance through incorporation into or attachment to the structure.

Effect on existing The existing public drawdock would be retained in its current location, and in its current form public drawdock and width. (slipway).

20 Future use Future use Future Our response 21 The control cabinet is proposed to be located adjacent and to the west of the disused toilet the disused toilet of the west and to adjacent be located to is proposed cabinet control The its visual effect reducing structure, stone the current with blend be designed to would block and trees. significant damage to and avoiding area new a potential also provide of the site and design the permanent layout for Our proposals of this area. the appearance enhance which would along the foreshore of public space be designed as a would and area on this hardstanding be located would column A ventilation feature. a 6m due to up to 10m to a potential from has been reduced column height of the main The main tunnel. the for strategy change in the ventilation would Bridge Putney to adjacent immediately required column ventilation small diameter The the to or attached into and incorporated bridge II listed the Grade with blend be designed to structure. ensure to has been developed Thames of the River in the foreshore permanent structure The is fully reinstated. slipway the existing and that users on river be no effect would that there of in terms design is acceptable that the proposed modelling has indicated Preliminary flow. river key and other of London Authority the Port with been discussed have proposals The navigation. on river has a minimal effect a layout develop to stakeholders the extent reduce sought to have and design of the site the permanent layout for Our proposals as as far ecology on water minimise effects to the foreshore within of the permanent works possible. possible identify to being undertaken are and foreshore Thames of the River surveys Ecological required. where be incorporated would measures and design effects, quality, water local to improvements wide river also deliver of the tunnel would Construction and improvements including habitat ecology, on river effects in positive result which would fish kills. reduced Issue Effects on on Effects Green. Waterman’s of the Visual effect columns. ventilation on river Effects navigation and hydraulics. Loss of foreshore and effects habitat on ecology. Table 3.1: Site specific issues that have influenced our permanent design our influenced Site specific issues that have 3.1: Table Putney Bridge Foreshore

Figures 3A, 3B, 3C and 3D show the current site and provide illustrations of our design proposals. Further Related documents: information on the development of our design can be found in the Design development report. Design

Figure 3A: Photo of the site – before the works

22 Future use

Figure 3B: Artist’s impression of the site – after the works are completed

23 Putney Bridge Foreshore

Figure 3C: Aerial view of the completed works

24 Future use

Existing stone cobbles to Recycled timber be protected or removed New riverwall with New Putney fenders as seating during construction, vertical fenders Bridge CSO outlet for viewing bridge stored and reinstated

Bicycle stand relocated along footpath

Removable bollards for access for maintenance vehicles

Existing bollards Lower Richmond Road to be refurbished and relocated

New cobbles to Ventilation Electrical and control Ventilation Interception match existing column kiosk incorporating column chamber below biodiverse roof and bridge arch stone cladding to to capture match existing wall existing CSO Figure 3D: Layout of site once construction works complete

25 Putney Bridge Foreshore

Operation and maintenance Management of operational effects Once the tunnel is operational, we would need access We have undertaken technical work, including stakeholder to the site occasionally for inspection and maintenance engagement, to assess and identify the key issues purposes. We expect to visit the site approximately associated with this site once it is operational. Table once every three to six months to carry out inspections 3.2 summarises these issues and how we are currently and maintenance of the ventilation and below ground proposing to address them. 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 into the shaft. This is likely to take several days and would require temporary fencing around the shaft for safety and security while the inspection takes place.

We may also need to make visits to the site for unplanned maintenance or repairs, for example, if there is a blockage, or equipment failure. This may require the use of mobile cranes and vans.

Permanent vehicular access would be from Embankment.

26 Future use

Issue Our response

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 arising Possible odour effects during from the operation of the tunnel. The technology we are proposing to use at this site the operation of the tunnel. includes the use of passive below ground carbon filters that will remove possible odour before air leaves the ventilation equipment.

Permanent access would be required for maintenance and servicing purposes to Disturbance from future the shaft and ventilation equipment. Any planned maintenance visits would be maintenance access. 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