Environmental Statement Non-technical summary Riverwell Multistore… · Environmental Statement...

Environmental Statement Non-technical summary

Watford Riverwell Multi-Storey Car Park & Access October 2018 Watford Health Campus Partnership LLP

savills.co.uk

Watford Health Campus Partnership LLP

1 October 2018

Watford Riverwell multi-storey car park & access – Environmental Statement NTS

Watford Riverwell multi-storey car park & access

Watford Health Campus Partnership LLP has submitted two detailed planning applications to Watford Borough Council (WBC) seeking planning permission for the development of 1) a multi-storey car park (MSCP) and 2) an access road to the MSCP from Thomas Sawyer Way, Watford.

The Site is shown by the red line, located between Thomas Sawyer Way and Watford’s Vicarage Road Football Stadium. This is the location of the former Farm Terrace Allotments and car parking area for Watford General Hospital. It is part of Watford Riverwell regeneration area, formerly known as Watford Health Campus. The planning applications are accompanied by an Environmental Statement (ES) which reports on the findings of the Environmental Impact Assessment (EIA) of the scheme1. Environmental Impact Assessment is a process through which the likely significant environmental effects of a development proposal are identified and reported in the environmental statement, which is submitted with a planning application. This document is a non-technical summary of the environmental statement. It aims to make the key issues and findings accessible and easily understood by the general public. The development proposals comprise enabling works to prepare the Site for the construction of a new access road from Thomas Sawyer Way, which would connect with the proposed 7-storey multi-

1 Town and Country Planning (Environmental Impact Assessment) Regulations 2017


2 October 2018


storey car park, and thereafter, the future implementation of plots within the Masterplan for the Health Campus.

The Site

Currently some of the land is used for car parking and the former allotment area has been cleared and trees removed. Historical mapping indicates the north of the Site comprised allotment gardens from the 1900s onwards until around 2015. Past uses within the south of the Site have comprised sluices associated with sewage works, a depot in the south and ‘works’ in the east. Local planning context: To place the current planning applications in context, a planning application was previously submitted in March 2014 in relation to the Farm Terrace Allotments, which sought outline planning permission for the development of hospital/healthcare uses and for up to 69 new residential dwellings. The planning application (14/00512/OUTM) has not been determined. Watford Borough Council seeks to meet a significant proportion of it's future development needs in four key areas, including Riverwell (Watford Health Campus). This area has been identified to provide a mixed use scheme including new hospital facilities, at least 500 new homes, employment space, local shops and a primary school and deliver in the order of 1,000 to 1,900 new jobs. Watford Health Campus masterplan: In January 2015, outline planning permission was granted for the Watford Health Campus masterplan comprising residential dwellings, new hospital accommodation, business, retail, office, hotel and leisure uses over an area of 26.5ha. Following the grant of planning permission, the new access road, Thomas Sawyer Way, opened in late 2016 and the development of Trade City was completed in 2017. Phase 1 of the Riverwell development, Woodlands at Willow Lane, is being developed to provide 95 residential apartments (17/00178/FULM). A residential care community forming part of the Waterside area has been approved and is progressing


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(17/01543/FULM). Remediation works to for the eastern part of Waterside were approved early in 2018 (17/01162/FULM). These are enabling works in advance of residential development for which a planning consent will be issued when the legal agreement is completed (17/01511/FULM). Environmental considerations in the design process: Kier and the project team has worked to consider how the MSCP would function as part of the overall Watford Riverwell development and in the context of the buildings that will be developed immediately adjacent to it in in the future. Various locations for the car park have been tested to establish the best solution. The car park will be part of the arrival point for visitors in the central hub which must be well-related for visitors to the hospital, leisure uses, Watford Football Club, and the hotel. Importantly, it will provide step-free access to the future hospital extension via a pedestrian bridge proposed on the third-floor level of the car park. The existing topography of the site and the gradient from north to south has been considered in the design process and used to manage the potential perceived bulk of the structure. As part of this design response, the future residential and hotel buildings coming forward as part of the masterplan area will be used to partially screen the structure and add variety to the massing within the wider site. The scheme assessed: The main physical features of the proposed development comprise a seven-storey multi-storey car park and an access road from the existing four-arm roundabout junction on Thomas Sawyer Way. The Site includes land that will be utilised as a construction compound in undertaking the works.

The MSCP proposal is to replace existing car parking, together with on-road parking within the Hospital, the existing spaces used for Watford Football Club, and in addition, provide 50 spaces for use in connection with a Hotel (subject to a further planning application) and a contingency allowance.


4 October 2018


Enabling works including soil remediation, obstruction removal and retaining structures. Earthworks will be required to form the site level. Temporary sheet piling may be required to the north elevation of the site to maintain the different ground levels. The access road would connect Thomas Sawyer Way with the MSCP, and thereafter, the future implementation of plots within the Masterplan for the Health Campus. Temporary access to allow continued operation of the existing hospital visitors surface car parking site will be provided. Up to 1,460 spaces will be provided in the car park (1,400 spaces minimum). In operation these will be allocated for use between hospital staff, visitors and patients, Watford Football Club and spaces for hotel use (in future), as: 1,350 Trust spaces for staff, patients and visitors; 60 Watford Football Club spaces; and 50 Hotel spaces. An area of permanent hard and soft landscaping will incorporate the existing pedestrian link with the emergency escape from WFC stadium to the current surface car parking area closest to the hospital. A temporary connection will be maintained during the construction of the MSCP. Surface water attenuation and foul drainage connections will be installed to the boundary of the MSCP plot. A Remediation Strategy has been prepared to manage the contamination that may exist due to previous use of the land. The works would include:

vegetation clearance;

removal of hard standing;

cut and fill earthworks;

removal of buried obstructions;

preparation of formation levels for the MSCP (including construction of a piling mat);

preparation of formation level for the access road;

construction of the access road;

construction of a retaining wall to the north of the MSCP;

laying of new buried services along the access road; and

soft landscaping along the access road.

The Remediation Strategy will remove specific hotspots of contamination which could contribute to localised soil or groundwater contamination. Validation samples will be undertaken in such areas to show that contamination has been effectively removed. Resulting excavations will be backfilled with a clean engineered fill material that is confirmed as suitable for use. Materials on-site will be re-used where it is appropriate and a clean topsoil / subsoil will be placed in areas of soft landscaping. The presence of the MSCP building, hard surfaces and clean topsoil / subsoil will ensure that potential pollutant linkages are broken and the risk of harm to human receptors from inhalation, dermal contact and ingestion of contaminated soils following completion will be negligible. Basic gas protection measures will be incorporated into the MSCP design if this is deemed necessary to provide a barrier against potential ingress from ground gas or vapours. Potential effects combined with other development: The proposal would provide a surface water sewer to convey flows from the future Northern Masterplan Plots and the MSCP to connect into the Thames Water network and eventually discharge into the River Colne. The drainage works have been designed to cope with the surface water and foul flows of the future plots of the Northern Masterplan. EIA scoping: In July 2018, a request for the formal EIA scoping opinion was submitted to Watford Borough Council. The request was accompanied by an EIA scoping report which set out the proposed


5 October 2018


study of environmental issues for the development and indicated which issues were not considered likely to have significant effects. Ground conditions and surface water drainage were identified as environmental issues that could give rise to significant effects and would be included in the EIA. A summary of the assessment for these issues is provided in the following pages of this NTS. The potential for ground contamination and has been informed by a comprehensive review of information sources, including those made available by the EA and Watford Borough Council. Potentially contaminating historical uses of the Site comprise allotment gardens, works/depots and a sluice associated with a nearby sewage works. A Preliminary Environmental Risk Assessment and Outline Remediation Strategies have been prepared to accompany the planning application and to inform the assessment. The Site is underlain by aquifers and intrusive investigations have identified groundwater at about 15 metres below ground level. The River Colne lies 84 metres south of the Site. Enabling works to prepare the Site for development will remove Made Ground (a potential source of contamination) and a significant quantity of shallow natural soils in the footprint of the MSCP, resulting in a potential source of contamination to groundwater being removed from the Site. A risk assessment will be undertaken prior to commencing any piling required for building foundations and groundwater monitoring at the perimeter of the site will be undertaken throughout enabling and construction works to ensure that groundwater quality will not be negatively affected. Any material recovered during the enabling works for re-use within the site will be tested to ensure that it is suitable in relation to the protection of human health, vegetation, surface water and groundwater. The completed Development will be predominantly comprised of hard surfacing and the MSCP building. This will restrict infiltration of rainwater into the ground and protect the underlying aquifers. Should significant ground gas or vapour be identified during ground investigations, suitable protection measures such a vapour barrier will be incorporated in the MSCP. A Construction and Environment Management Plan will be implemented during enabling and construction works to manage and mitigate risks to human health receptors (Site workers and the general public) and the water environment. When completed, the proposed development will have no significant adverse effects in respect of ground conditions or contamination. Remediation and construction waste: Waste will be produced, but the objective is to minimise it as far as practicable. Waste prevention will take priority, followed by re-use, recycling or other recovery so that disposal is only used where necessary. A flood risk assessment and drainage strategy have been prepared to accompany the planning application. The assessment of the potential effects upon water resources and drainage have been informed by a review of various information sources, including those made available by the Environment Agency (EA) and Thames Water. According to the Environment Agency’s current Flood Map for Planning, the area proposed for the MSCP is located within Flood Zone 1 (low probability of flooding), and the access road is located within Flood Zones 1, 2 and 3 (medium and high probability of flooding). This is associated with the River Colne located approximately 100m to the south of the Site. However, as part of the planning application for the Watford Health Campus (ref. 14/00511/OUTM), a hydraulic investigation of the River Colne was undertaken by AECOM. This included a modification of the Environment Agency’s hydraulic model to account for the removal of an existing culvert forming a tributary of the River Colne and its replacement with an open channel. These works were completed in association with the construction of Thomas Sawyer Way (but not yet factored into the EA Flood Mapping).


6 October 2018


To adhere to most recent guidance regarding climate change allowance (published in February 2016), the 1 in 100 year +35%, and 1 in 100 year + 70% climate change, and 1 in 1,000 year scenarios have now been applied in the model. This established that the Site is unaffected by flooding up to and including the 1 in 1,000 year event, and which confirms it as being within Flood Zone 1, the lowest probability of flooding. During the enabling and construction works, the Construction and Environment Management Plan will include temporary measures to control surface water runoff from the Site, particularly during any earthworks activities. Such measures would include the provision of adequate drainage to manage surface water run-off. Existing sewers and ditches will be adequately protected and / or disconnected and altered in line with best practice. The proposal is not expected to significantly alter or displace the existing groundwater flows beneath the Site and thus the risk of groundwater flooding on or off-Site is not expected to increase. It is proposed to discharge surface water arising from the development into the River Colne via a proposed Thames Water surface water sewer. This would convey runoff from the Site beneath Thomas Sawyer Way to the River Colne. The highways drainage works have been designed to cope with the future flows of the Northern Masterplan. Surface water flood risk would therefore not increase on or off-Site as a result of the proposed development. Overall the proposed development would not have any significant adverse effects on water resources and flood risk. The consideration of environmental topics scoped out of detailed assessment in the EIA is summarised below. Transport: In terms of the existing conditions, the site is well connected to the local highways network and is not considered that there are any safety issues in the area in relation to accidents. The proposed development of an MSCP is effectively to replace the existing car parking, together with on-road parking within the Hospital, except for an allowance needed for a Hotel planned as part of the Masterplan. This will be the subject of a separate planning application and approval will be sought to use the Hotel spaces through that future application. In terms of cumulative assessment, there would be an additional 15 trips in the morning peak and 11 trips in the afternoon peak relating to hotel use. Therefore, it is not considered that there is will be any highways impact in accordance with paragraph 109 of NPPF. Air quality: Consideration of the potential effects on air quality has been undertaken to identify any likely air quality impacts associated with the proposed MSCP when it is in use. This has taken into account the cumulative impacts of the consented developments within the Watford Health Campus (Waterside, Mayfield and Woodlands Developments). The proposed development area is not located within an Air Quality Management Area, but AQMA 2 Vicarage Rd / The Hornets is located nearby, to the northeast of the Site. The results of the air quality modelling show that pollutants remain considerably below the annual mean objective levels with the development in operation. Therefore, no additional mitigation measures for transport will be required. In relation to the potential for construction dust effects, construction operations will be carried out in line with good site practice, secured through the implementation of the CEMP. Noise: As there will be no material change to vehicle movements on the highway, the MSCP development will not have an effect on local noise environment. Standard best practice mitigation measures would be employed during the construction operations to control noise, implemented through the CEMP. Archaeology and heritage: There are ten Conservation Areas in Watford. The closest is the Square Conservation Area, on the north west side of the Stadium. This designation is centred upon the cemetery, (developed in 1856), and the estate of terraced houses, which was built in the 1890s. The Conservation Area lies outside the visual envelope of the proposed development.


7 October 2018


The nearest listed building is the Grade II Administration Block at Shrodell’s Wing, Watford General Hospital, formerly the Watford Union Workhouse. In relation to the Site, views to and from it are blocked by surrounding buildings. Other listed buildings are outside of the visual envelope. No effects on the setting of listed buildings or the Conservation Area are predicted. In the 19th and 20th century the area has experienced profound changes with the creation and the dismantling of the Cardiff Road Industrial estate and Watford sewage works which has resulted in large scale interventions and earthmoving. With respect to below ground archaeology these changes and the historic evidence from archive and published sources, suggest that it is unlikely that the site will retain any important archaeological evidence of earlier activity. There is no more than a low potential for surviving archaeology that could be disturbed (and which would be of local character). To address this, a Written Scheme of Investigation for a watching brief has been provided in connection with previous applications and similarly, this is considered to be an appropriate approach for the MSCP and Access Road proposal. Biodiversity: The Site has been cleared of vegetation and trees. There would be no additional direct effects on habitats or species through construction and operation of the MSCP. There are no adverse impacts predicted upon any important ecological receptors. Landscape and visual amenity: In the context of the masterplan development and the assessments undertaken for potential effects on landscape and visual amenity (14/00511/OUTM and 17/01511/FULM) it is not considered that the MSCP would introduce any additional effects that have not already been assessed. The previous assessment found that the effects of the built development will largely be limited to the immediate surroundings of the site. The improved urban character of the site will bring a beneficial effect on landscape features and the effect of the proposals on landscape character would not be significant. Locally, the visual effect in the immediate surroundings would change as a result of the MSCP construction. However, the new building will be seen in the context of continued implementation of a new quarter for west Watford as planned for in Policy SPA3. Effects on people: The purpose of the proposed MSCP is to replace existing car parking spaces that are present on the site. It will provide an improved facility for car park users and the access routes to the north, including emergency egress for the Stadium visitors, which will be maintained during construction and upon completion. There would not be any adverse community effects of developing the MSCP. Waste: An excess of material will be generated during the works to prepare the site. Stockpiles of material will be minimised as far as is reasonable possible, positioned on impervious surfaces, with different materials types segregated and labelled. It is not anticipated the significant quantities of hazardous material will be encountered. It is considered that the majority of the material can be reused, recycled and / or recovered as appropriate in line with best practice site management. Energy demand: The MSCP proposal incorporate additional ducting and service routes to facilitate the installation of electric vehicle charging points. The new sub-station has been sized to ensure it can serve this provision. Risk as a result of major accident / disasters: An Explosive Ordnance Threat Assessment has been prepared for the Watford Health Campus site. This has established the risk level at the site and the mitigation measures that will be implemented during site works in order to manage that risk. A Design Risk Analysis process is followed by the designers to record decisions that are made to eliminate, reduce or manage conventional construction risks. The design of the MSCP and its cladding is influenced significantly by the need to ensure adequate ventilation within the structure. Access for emergency vehicles to attend to incidents has also been consideration. The design of the MSCP has been prepared in a way that maintains the escape route from the adjacent football stadium.


8 October 2018


Interaction between environmental aspects: The assessment of ground conditions and the drainage/water environment have considered the possibility of contamination to be present in the soils and how this could affect human health and the quality of water run-off which would be directed off-site and ultimately enter the River Colne. Vehicle movements have been considered for potential effects on local air quality, but scoped out of detailed assessment. Difficulties in compiling the required information: The project team has been working on the assessment of the application site and the design of the proposal as part of the wider Watford Riverwell scheme. No difficulties have been encountered in establishing the information necessary to understand the effects of the proposal on the subjects considered. In respect of any residual uncertainty related to the ground conditions that will be encountered, the remediation strategy includes provision for unforeseen contamination and the preparation of additional remediation method statement to implement actions and reporting to demonstrate that the material has been effectively remediated.

The full Environmental Statement can be viewed during normal office hours at Watford Borough Council. Comments will be considered as part of the Council’s consultation on the planning application. A copy of the Environmental Statement on CD is available at a charge of £5.00. Enquiries in respect of these or printed copies should be made to Savills 020 7499 8644.

Do not remove this panel from the drawing

No dimensions to be scaled from this drawing

Report all errors and omissions to the Architect

Dimensions to be checked on site before fabrication

© Pod Architects

3rd Floor, 36 Spital Square

London E1 6DY

www.pod-architects.com

T +44 (0)20 7490 2246

F +44 (0)20 7490 8967

Drawing no.Project no.

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podarchitects

TPE_000 00

WATFORD MSCP

ACCESS ROAD

AND ENABLING WORKS

LOCATION PLAN

TOWN PLANNING

A3 1:1250 MF

12/10/18PS

Drawing based on:

- PDF: '8. Approved Hybrid Application

Illustrative Phasing Masterplan'

- DWG: 'C11744 - Watford Health Campus -

asbuilt'

- DWG: '1. G7535-Topo-R6 Layout1'

- DWG: 'Watford_Typical Floor Plan'

- PDF: 'Red Line Boundary', 'Final Sealed CPO'

'Official Copy (Title Plan) - HD519250'



provided by WBC

- DWG: 'Watford Health Campus_post

construction Rev B_1'

-DWG "1567-TP3-01-F"

- DWG 'Topographical Survey' by Cloud 10

-DWG '30101_Level_00' by Stripe

-DWG '11284-WIE-ZZ-GF-DR-C-04009 P04

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Do not remove this panel from the drawing

No dimensions to be scaled from this drawing

Report all errors and omissions to the Architect

Dimensions to be checked on site before fabrication

© Pod Architects

3rd Floor, 36 Spital Square

London E1 6DY

www.pod-architects.com

T +44 (0)20 7490 2246

F +44 (0)20 7490 8967

Drawing no.Project no.

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podarchitects

TPP_001 00

WATFORD MSCP

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Drawing based on:

- PDF: '8. Approved Hybrid Application

Illustrative Phasing Masterplan'

- DWG: 'C11744 - Watford Health Campus -

asbuilt'

- DWG: '1. G7535-Topo-R6 Layout1'

- DWG: 'Watford_Typical Floor Plan'

- PDF: 'Red Line Boundary', 'Final Sealed CPO'




provided by WBC

- DWG: 'Watford Health Campus_post

construction Rev B_1'

-DWG "1567-TP3-01-F"

- DWG 'Topographical Survey' by Cloud 10

-DWG '30101_Level_00' by Stripe

-DWG '11284-WIE-ZZ-GF-DR-C-04009 P04

by Waterman Group

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Proposed KerbRefer to drawing no 11284-WAT-XX-DR-C-95148 for kerband edging details

Proposed Edging

225mm x125mm Precast Concrete Half batteredkerb (125mm upstand)

Restraint/Starter. Speed Check Block(Channel Square) or similar (255mm x125mm)

150x50mm Precast Concrete edging (flat top).

HB2

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Precast Concrete Dropper kerb left / Dropper kerbright (125mm-0mm)

BN(0) or BN(25) Bullnose kerbs(Upstand)25mm upstand at vehicular access.No upstand at cycleway/pedestrian crossingsand kerb drainage inlets

Pavement Key:

Adoptable footway FW1 (Paving Slabs)Surfacing 300x200x80mm Marshalls La Liniapaving (Colour - mix of dark and light grey) on50mm sand laying course (compacted).Sub-base 250mm Type 1 granular materialCBR=2.0%Table 3.2 HD39/16

Adoptable footway FW2 (Block Paving)Surfacing 100x200x80mm Marshalls Tegula blockpaving(Colour - pendant grey) on 50mm sand layingcourse (compacted).Sub-base 250mm Type 1 granular materialCBR=2.0%Table 3.2 HD39/16

Tactile Paving FW3Surfacing 400x400x50mm Tactile pavingslabs on Tactile paving blocks on 50mmsand laying course (compacted) (Colour-Buff uncontrolled crossings)Sub-base 250mm Type 1 granular materialCBR=2.0%Table 3.2 HD39/16

Adoptable pavement Construction P2 (BlockPaving)SC2 100x200x80mm Marshalls Tegula blockpaving (Colour - pendant grey) on 30mm sandlaying course (compacted).RB1 165mm - AC32 base 40/60 rec to BSEN13108-1 Asphalt ConcreteSB1 320mm - Type 1 granular sub-basematerial to clause 803. CBR=4.3%

Footway Key:

Adoptable pavement Construction P1 (AsphaltSurfacing)SC1 40mm AC10 Close SURF 100/150 to BSEN 13108-1 Asphalt ConcreteBC1 60mm AC20 lin 40/60 rec, top BS EN13108-1 Asphalt ConcreteRB1 165mm - AC32 base 40/60 rec to BSEN13108-1 Asphalt ConcreteSB1 320mm - Type 1 granular sub-basematerial to clause 803. CBR=4.3%

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Pavement Notes

1. All surface courses to have a min 60+ PSV.

2. For kerbing amd paved area details refer toconstruction detail drawing no11284-WAT-NR-XX-DR-95148

3. For detail of tie in between existing and proposedroad refer to construction detail drawing no11284-WAT-NR-XX-DR-95148 for details.

4. The Contractor shall make safe the run-on andrun-offs of the new pavement, raised longitudinaljoints and any raised cover and frames, wherenecessary

5. Where the new carriageway meets existingconstruction the binder and surface courses areto be stepped 300mm and 600mm respectivelyinto the existing carriageway. Final joint is to besealed with hot poured bitumen.

6. CBR tests are to be carried out by the contractorand tested under laboratory conditions. Resultsare to be reported to the overseeing organisationfor further instructions. Please note sub-basethickness may change depending on CBRresults, refer to IAN 73/06 (draft HD25) in theevent CBR value changes.

7. Bond coats shall be applied between bond layersof bituminous materials by metered mechanicalspraying equipment, spray tanker or sprayingdevice integral with the paving machine. Bondcoats shall have a BBA certification and complywith MCHW Clause 920

8. Refer to drawing no's11284-WAT-NR-XX-DR-C-95148 for typicalcross section details etc

9. All traffic management plans must be submittedto The Highway Authority and approved prior towork commencing on site.

10. Speed table to be installed in accordance withthe detail shown on drawing no11284-WAT-NR-XX-DR-C-95148

11. For highway drainage arrangement refer todrawing no 11284-WAT-NR-XX-DR-C-92140

12. Kerb upstand to be set at 125mm for HB2 kerbs,25mm for BN kerbs at vehicular accesses andno upstand for cycleway pedestrian crossingpoints

13. Bio-retention trench inlets to be installed inlocation shown on drawing and as detailed ondrawing no 11284-WAT-NR-XX-C-95149.

Amendments

DescriptionDateRev

Title

Client

Designed By

Drawn By

Checked By

Date Scales @ A1

By

Project

File

Pat

h

Waterman Ref

Project - Originator - Volume - Level - Type - Role - Number Revision

aterman

[email protected]

Pickfords Whalf, Clink Street,London SE1 9DG020 7928 7888

WATFORD RIVERWELL

Section 38 WorksConstruction Areas


CTI

CTI

HC

Sept 2018

l\Projec

1:250

11284-WAT-NR-XX-DR-C-95147 P0111284-WAT-NR-XX-M3-C-95002 PAVEMENT, 147_NM_100_GROUND FLOOR_REV03 Amended, A1-Wat-BS-S

SAFETY, HEALTH AND ENVIRONMENTAL INFORMATIONUNUSUAL SIGNIFICANT HAZARDS

Status

PRELIMINARY

http://www.watermangroup.com

mailto:[email protected]

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