Drainage Strategy for Business Park prevents pollution from Fire-fighting event

7 11 2017

Toulouse Plant Limited proposed redevelopment of a 5,600m2 brownfield site at Littlebrook Business Park, north of Dartford.  The proposal comprised a materials recycling building, installation of weighbridges, offices, and ancillary buildings.  Their architects, March Design, submitted a Consultation to Dartford Borough and Kent County Councils.

The Stilwell Partnership were appointed to carry out a Flood Risk Assessment and develop a Drainage Strategy to submit with the Consultation.  The final Drainage arrangement had to prevent potential sources of pollution entering the groundwater, not just from normal operations, but to include catastrophic events such as a serious fire on the site.

Littlebrook Business park Schematic Drainage Layout

A Drainage Strategy considers all the many interrelated flooding and drainage issues associated with a development: Highway and Land drainage, Groundwater and Watercourses, Foul Water drainage, Surface Water drainage and Sustainable Drainage (SuDS).

The Environment Agency mapping service indicated the site is over a Minor Aquifer and is adjacent to a Ground Water Source Protection Zone.  Treatment measures would be included in the drainage network as appropriate to ensure that potential sources of pollution are prevented from entering the groundwater.

The Drainage Strategy considered the SuDS hierarchy and the best option was selected based on the underlying geology.  In this case, based on MicroDrainage calculations, buried attenuation tanks were proposed to take run-off from intensive rainfall events.  The tanks would gradually empty at a controlled rate into an existing private surface water sewer.

On site gradients and crossfalls were developed to accommodate the complex drainage arrangements.  Rainwater run-off from the roof areas would pass through a catchpit to trap the sediment content.  Surface water run-off from the parking/weighbridge area would pass through a bypass oil separator to remove pollutants and debris.

The Environment Agency requested that surface water run-off from the main yard passes through a full retention separator, to remove the potentially high silt content and debris with large sediment particles from the run-off, before discharging to the main foul water sewer.

Vehicle wash down effluent would be expected to contain high levels of pollutants. A specialised vehicle wash catchpit and full retention separator would be provided to treat the effluent before discharging to the main foul water sewer.

The Flood Risk Assessment revealed that the site is presently protected by existing off-site Environment Agency flood alleviation measures and is therefore categorised as within Flood Zone 3 (Defended)

The site is not expected to be subject to flooding provided those flood defences remain intact.  The report considered a breach of the flood defences and recommended additional flood protection (flood gates and doors) to the office and ancillary buildings, equivalent to the defence breach level plus climate change provision.  These additional measures would provide adequate time for any occupants to evacuate the site safely.

At a late stage in the process, Kent County Council raised the question of protecting the surface water drainage system in the event of a fire.  They required measures to be included that would prevent pollution bypassing the interceptors and washing into the sustainable drainage system.

It was proposed that in the event of a fire, shut-off valves would isolate the yard areas from the surface water drainage systems.  These areas have been “dished” to increase their standing water capacity.  Following a fire event, the client would use a temporary pump system to over-pump the fire water into the foul sewer before opening the shut off valves to their normal position.

In September 2017, Kent County Council accepted this proposal and lifted their objection to the development proceeding.

The Stilwell Partnership also produced a Transport Statement and Travel Plan for this proposed development.

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Transportation helps Warfield Park Homes win Planning Appeal

4 10 2017

The Stilwell Partnership were pleased to be able to make a key Transportation contribution towards the success of this Appeal by Warfield Park Homes of Bracknell.

A Planning Application locating up to 82 mobile homes on their adjoining land, with suitable alternative green space (SANG), and informal open space, together with access improvements, landscape and diversity measures had been refused by Bracknell Forest Borough Council.

Warfield Park Homes appealed and on 27 September 2017, the Planning Inspector published the decision.  The Appeal was allowed and planning permission granted subject to conditions and a section 106 agreement.

One of the main issues considered by the Inspector was whether the proposed development would be in a sustainable location in respect of proximity to everyday services and facilities.

Warfield Sustainability Map

Transportation issues were carefully considered by the Inspector and described at length within the decision notice.  The Inspector considered the available facilities on site and the needs of future residents to leave the site for education and employment.

The Inspector considered the Stilwell Partnership’s Transportation Assessment (TA) and Sustainability Drawing in the context of current Planning Policies.  Referring to Providing for Journeys on Foot and Manual for Streets guidance, the TA had referred to acceptable walking distances and available public transport to reach off site facilities.  The TA also included a trip analysis to indicate the likely traffic generated by the development.

The Inspector concluded that “Whilst not well-connected, neither would (the site) be in a completely unsustainable location with no choice of transport mode or give rise to greatly increased car travel. In these respects, it would be consistent with the development plan.

The Stilwell Partnership were pleased to be part of the Project Team providing Transportation, Drainage and Sustainable Energy input to the proposed development.

The Inspector also considered the effect of the proposed development on the character and appearance of the countryside and commented “whilst the proposed development would encroach into the countryside, being similar in form and appearance to the existing development at Warfield Park, it would not be unduly incongruous or uncharacteristic”, and that “The biodiversity improvements over the remainder, and considerably larger part, of the appeal site would enhance its character.

The Project Team was led by GVA on behalf of Warfield Park Homes and included Woolf Bond Planning Consultants; HDA Enviro, Landscaping and Ecology; and legal services by Tozers Solicitors and 39 Essex Chambers.

 

 

 





The Jockey Club promotes Sustainable Travel for Cheltenham Racecourse

16 08 2017

Cheltham Racecourse New Stand

Stilwell Partnership are pleased to be appointed Travel Plan Coordinator by the Jockey Club for the prestigious Cheltenham Racecourse improvement.

The Jockey Club’s sustainability policy has ambitious targets for reducing energy, increasing the proportion of recycled waste, and minimising the impact of their business on the environment.

Their £45m investment for the new grandstand at Cheltenham Racecourse included the implementation of a Travel Plan.  The Travel Plan promotes alternative sustainable forms of transport for racegoers and staff travelling to and from the site.  Monitored and reviewed over a 10-year period by the Travel Plan Coordinator, the Plan sets challenging targets.  The aim is to reduce traffic congestion and delays, reduce CO2 and NOx emissions from vehicle exhausts and improve air quality.

As Travel Plan Coordinator, the Stilwell Partnership are responsible for the Plan’s performance, periodically reviewing the use of public transport, cycling, and walking to reach the site.  We would also be responsible for identifying further measure to improve uptake.  Results will be analysed and shared with the County Council Highway Authority, who are responsible for overseeing progress.

Advance publicity will provide a range of sustainable transport options so that visitors and staff can travel safely and efficiently to and from the course.  Options will include walking & cycling routes, public transport, and car sharing.  The location of car charging points for electric vehicles will also be provided.

Around 300,000 visitors attend the annual 4-day National Hunt festival in March.  In addition, an increasing number of visitors attend other popular race meetings throughout the year.  Outside these periods there is frequent use of the course facilities for conferences and exhibitions.

Implementing a Travel Plan at Cheltenham Racecourse provides valuable data that can used to further improve the uptake of sustainable transport elsewhere.  Successful techniques learned here may be introduced at other racecourses or sporting events around the country.

Go to our website project sheet





Derbyshire Development Wins Planning

12 07 2017

The Stilwell Partnership were pleased to help their long-standing client, Tapton Estates, win Outline Planning Approval for the proposed development of Derwentside Industrial Park, Belper, Derbyshire.

Amber Valley Borough Council unanimously approved the Application on 11 July 2017.

The scheme comprised the demolition and clearance of existing industrial buildings and re-use of the 6-ha site for 136 residential units.  The proposals also included access improvements and associated works.

Belper Tapton Master Plan

The Stilwell Partnership, with colleagues from the Patrick Parsons Group, put together a comprehensive package of technical assessments addressing many of the contentious issues and potential financial challenges facing development of the site:

The Transportation Assessment addressed potential future Traffic Impact and the long-term sustainability of the site.

The Travel Plan Framework provided an overall strategy to encourage sustainable transport measures; to increase walking, cycling, use of public transport and encourage more efficient car-use.

The Geo-Environmental Assessment examined the geotechnical issues on the site including ground conditions, potential contamination, and the building foundation requirements.

The Utility Constraints Assessment ensured there was adequate service capacity for future development without major investment in utility diversions.

The Flood Risk Assessment and Drainage Strategy confirmed that there was minimal flood risk on the site and that a foul and surface water drainage system was feasible within the capacity of local network.

The Noise Assessment considered the impact of noise from nearby roads and suggested mitigation measures that could be incorporated into future development.

On this proposed development, the Stilwell Partnership worked closely with the other project team members; David Lock Architects, FPCR Environment and Design Ltd and Rigby and Co, Commercial Property Agents.

If you would like to know more about these individual reports, or how we can deliver a successful one-stop package of services for your development, please phone our office on 0333 700 401 or email us

 





Construction & Environmental Management Plans

5 04 2017

Construction Management Plans (CMP) are increasingly required by Local Authorities as a condition of the Development’s Planning Consent.  CMP aim to reduce the impact of the construction operations on the local area.

Following many traffic road accidents involving construction traffic, these Plans also aim to identify potential hazards and identify appropriate road safety measures.

The Stilwell Partnership’s experience in Traffic Management, Road Safety and Highway Engineering has proved particularly applicable to the production of CMPs.

In London, a Construction Logistics Plan (CLP) is required. A CLP should improve the safety, efficiency and reliability of deliveries to that location.  It should also identify unnecessary journeys, and deliveries that could be made by more sustainable transport modes, to help reduce congestion and minimise the environmental impact of freight activity.  Particular emphasis is placed on road safety.

  • Oakforest Properties Limited had Planning Permission in the London Borough of Barnet, for four 2-storey family dwellings together with the formation of hardstanding to provide 5 car parking spaces. Existing buildings on the site were to be demolished. Planning Conditions were satisfied by our CLP in July 2016.
  • This small urban residential development for a private client in Paradise Street, Cambridge, satisfied Planning Conditions in February 2017 with our CMP which included additional consideration of Dust Management,
  • Our CMP produced for a 3 ha Solar Farm near Titchfield, Fareham, for Jardin Smith International and their Planning Consultant WSP Planning and Architecture of Reigate, successfully obtain Planning Consent in March 2017.

In each case, we carried out an assessment of the volume of traffic and types of vehicle.  Using Autotrack to model the vehicle swept paths, we checked the manoeuvrability of the construction traffic to negotiate the site access.

For larger sites, we identify suitable access routes for construction traffic from all directions.

App C TSP-LFH-P3025-02 – CMP Proposed Route

A major part of the Construction Management Plan concentrates on road safety of the other road users around the access and along the directed routes.  Highway sightlines and road conditions are assessed along the main access routes to determine what measures can be introduced to minimise the road safety risks to other road users.

Our full methodology to prepare a CMP including a Dust Management Plan considers the following:

  • The Site and Surroundings
  • The General Construction Strategy and Logistics
  • Site Waste Minimisation Measures & Dust Generation
  • Construction Management and Site Controls
  • Vehicle Types Required and Delivery Procedures
  • Mitigation Measures for Construction Traffic
  • Security and Health & Safety
  • Details of Any Hoardings
  • Materials and Plant Storage
  • Implementation and Monitoring
  • Pedestrian and Cyclist Safety
  • Consultation with Residents, Neighbours and Office Users

We have the experience to efficiently produce an effective Construction Management Plan, to the satisfaction of the Local Authority, and practical needs of the Contractor.





Building For Schools: Resolving Highways & Traffic Issues

23 03 2017

We have added a new section to our website describing our specialist contribution to the Building for Schools Programme and our continuing efforts to improve Road Safety around schools.

The Stilwell Partnership have successfully supported many School Building projects throughout London and the South East.  Considering issues of road safety, traffic congestion and parking, we identify safe and sustainable access arrangements for pupils, parents, and staff.

Resolving Highways and Traffic issues may be the key to a successful Planning Consent.  Our contribution can smooth the project’s progress from initial Concept, through the Planning process, and onto successful Completion.

School Expansion

To help St Joseph Catholic Primary School achieve Planning Permission for their expansion in Ealing, our Transportation Assessment evaluated the traffic generation and car parking associated with the development.  We produced a School Travel Plan recommending sustainable transport measures to minimise the impact on the local road network.

Claremont Fan Court School in Esher, planned a new sports hall.  In addition to assessing the traffic impact we produced an engineering design solution for improvements to the access road, new car park and “section 278” improvements to the adjoining public highway.  To help implement their planned expansion we designed alterations to the site drainage network and carried out a Flood Risk Assessment.

Traffic and Parking Problems

Hart District Council in Hampshire was concerned with the continuing traffic and parking problems around a number of schools and the resulting impact on road safety.  We undertook site studies and proposed a range of traffic management measures to improve road safety in the area.

Stilwell Road Safety for Schools

The Stilwell Partnership has been innovating and pioneering road safety solutions for over 20 years.  Our not for profit social enterprise srsCULTUREforSchools aims to instil a lifetime of road safety culture to our children by improving attitudes towards the safety of self and others and encouraging safe behaviour in the road environment.

Other Successful Schools Project references

Ark Blacklands Primary Fleet Primary School
Ilford & Kingston Primary Grayswood C of E Infant School, Haslemere
St Blasius Academy Shanklin St Bartholomew’s School, Haslemere
Clandon C of E Primary Tweseldown School, Church Crookham
Yateley Primary The Charter School
Cheam High School The Royal Junior School
West Byfleet Infant School St Dunstan’s Primary School




New Marriott Hotel, Cable Street, New Cross, City of Manchester

13 10 2016

Cable street.jpg

 

The Stilwell Partnership supported the successful Planning Application by Axcel Property Developments Ltd for a new Marriott hotel providing multidisciplinary design advice including Highways & Transportation, Drainage, Low Carbon Energy and Noise Assessments.

A full Planning Application was submitted for a 172-bedroom hotel on the brownfield site of a surface car park in Cable Street in Manchester’s New Cross area. The development comprised the hotel (Class C1) with associated public realm, landscaping and other associated work. Proposals included a café bar, fitness centre, meeting rooms and associated servicing areas.

Our package of engineering design services included:

A Transport Statement of the development’s transportation impact on the local highway network. Our assessment considered sustainable forms of transport, including opportunities for walking and cycling, and the accessibility to public transport. We also considered servicing and emergency vehicle access. Our assessment concluded that the development could be accommodated without detriment to vehicular flows and road safety.

A Drainage Strategy, to minimise the impact on the wider area from surface and foul water from the proposed development. The very confined site limited the range of sustainable drainage options. An attenuation solution was identified to control the surface water run-off.

The Noise Assessment highlighted the application site was in a relatively noisy area impacted from road traffic noise on the A665 Addington Street.  Mitigation action proposed triple glazing to the bedrooms on the assumption the hotel would have air conditioning, to control internal noise levels to meet the standards set by WHO and BS 8233:2014.

Manchester City’s Planning Policies place great emphasis on decentralised energy schemes in the City centre. Using our CHP modelling software, the Sustainable Energy Assessment determined that the proposed development would be able to potentially contribute towards a future local district heating scheme and achieve an improvement of at least 15% CO2 emissions based on the predicted energy demand.

 

See the project sheet here: http://stilwell-ltd.co.uk/Projects/Cable_Street