Barnet Waste Transfer

London

Project Details

Client
London Borough of Barnet

Project Manager
Capita

Architect, Engineer, MEP
Capita

Contractor
Willmott Dixon

Value
£11.9 million

Contract Period
55 weeks

Procurement Type
Southern Construction Framework

Form of Contract
JCT 2011 D&B

Size
19,500 m2 square meters

Apprentices Employed
2 New apprentices
5 Existing apprentices

The project was a design and build development of Oakleigh Road South Vehicle Depot to create a Barnet Council vehicle depot and a base for their fleet of 46 household recyclable waste collection vehicles. Now built, the depot will allow Barnet Council to operate its vehicle maintenance and recycling collection fleet from single coordinated site, ensuring the most efficient service for residents across the borough. The construction also consisted of a tractor barn and car parking, together with associated ancillary facilities, a recycling waste transfer building and bulking facility, a two storey office and welfare building.

Key challenges

  • Restricted access having a very long and narrow site
  • Huge underground drainage structures required removing
  • Significant and buried hazardous waste required addressing
  • Below ground water (a varied levelled required temp
  • To create a Visual impact to the local area
  • Multiple stakeholder engagement

How we delivered our services

  • Dry recyclables and food waste are removed from site before the end of each day to mitigate any smell.
  • Extra trees were planted on the embankments around the depot site to ensure minimal visual impact.
  • We found existing sewers that we then got permission from Thames Water to use them instead.
  • We worked in a ‘patchwork’ fashion, sectioning off the works and moving operations around to keep the access road fully open throughout the build.
  • We found a solution using a land drain pump to drain the ground water which was causing surface water.

“Thank you to your excellent team and well done in achieving the great end result that is the new Oakleigh depot.”

Karen Reid,
Project Manager

Lessons Learnt

The Good

  • Flexibility to the charging needs of the customer
  • Blue Sky thinking when attenuation tank needed to be moved
  • Prompt sketches and short term programme used to ensure revised brief was met

The Bad

  • Unexpected buried obstructions/gas bottles and asbestos cement
  • Difficult procurement of the 278 works
  • Understanding and dealing with the ground water ‘spring’

Save / SCF Benefits and Efficiencies

  • Raised levels by introducing engineered ground geotextile, saving £720k
  • Resulting in programme saving £110k
  • Added surveys resulting in reduced risk on hazardous waste, saving £205k
ContractGateway 2 PlanningGateway 3 Contract AgreementGateway 4 Variation
Cost£11,773,506£11,773,506£11,599,906(173,600)
Time58 weeks58 weeks58 weeksNIL

KPI Data & Framework Targets:

Apprentices 44 weeks (2 starter apprentices) and 5 exisiting apprentices
Average AIR Zero accidents / Zero Harm
Average CCS score 39.5(out of 50)
Waste diverted from landfill 98%
Cost/m2 £2,146m2 Efficiency Saving £3.4m
Customer KPI score 9/10
Collaborative KPI score 10/10

Contact

Guy Dawes, Framework Manager
Guy.Dawes@Willmottdixon.co.uk

Erika Buckenham
Erika.Buckenham@Willmottdixon.co.uk