George Leslie Ltd

Key Facts

  • Client: Scottish Water Solutions
  • Engineer: Faber Maunsell
  • Conditions of contract: NEC Option C
  • Contract value: £5,210,000
  • Duration of works: November 2005 – December 2006

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Wastewater Treatment Works

Stirling Wastewater Treatment Works

The work comprised a major upgrading of the existing Stirling Wastewater Treatment Works by the Purac Leslie Consortium.

The principal construction elements included:

  • £1m of advanced works incorporating service diversions, and the re-location of existing washwater booster set, the sludge cake holding shed and the overflow main protection works.
  • A new flow splitter drop box installed in the live inlet flow channel.
  • 100m of 600mm diam feed main installed at a depth of 2.8m.
  • A 4.5m diam segmental ring process feed pumping station 6.4m deep, with valve slab and access steelwork.
  • 500mm diam ductile iron feeder rising main above and below ground.
  • New reinforced concrete Sequence Batch Reactor tank, 62m x 46m x 5.5m high, complete with  access steelwork founded on 317No. 225mm2 concrete piles driven to a depth of 40m. (main picture)
  • A 4m diam process sludge return pumping station 4.5m deep, with valve chamber.
  • 130m of 280mm diam sludge return rising main.
  • New control structure MCC building and access road

The initial outline design was issued to the Consortium to develop, and during this process, savings of £1.2m were realised which enabled the project to be delivered within the original budget.

News updates


The overall project involves the off-site fabrication and installation of a new linkspan structure at Oban Ferry Terminal for client Caledonian Maritime Assets Ltd (CMal).

12th February 2019

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GL return to the Sound of Kerrera

GL making a return visit to the Sound of Kerrera off Oban, to undertake substantial repairs to the breakwater which suffered collision damage following an altercation with a workboat earlier this year.

14th December 2018

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Polmadie Bridge official opening……..

Michael Matheson MSP and Cabinet Secretary for Transport, Infrastructure and Connectivity covered all his portfolios at the official opening of the new Polmadie Footbridge giving pedestrian and cycle transport access,

18th September 2018

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George Leslie Ltd, Blackbyres Road, Barrhead, Glasgow, G78 1DU  |  |  +44 (0)141 881 9131