George Leslie Ltd

Key Facts

  • Client: Scottish Water
  • Engineer: AECOM
  • Conditions of contract: NEC Option C
  • Contract value: £2,911,760
  • Duration of works: Nov 2011 – Nov 2012
Water Treatment Works

Muirdykes Water Treatment Works Upgrading

Muirdykes Water Treatment Works treats raw water abstracted from the Rowbanks-Barcraigs impounding reservoirs and supplies up to 60Ml/day of potable water to the Howwood, Linwood, Johnstone and Paisley areas of Renfrewhire.

The existing works required upgrading to improve the drinking water quality with the opportunity also taken to undertake major capital maintenance upgrading.

The major elements of work included:

  • Replacement of the existing wash-water sludge transfer pumps and the installation of a second sludge balancing tank and agitator which included all associated pipe-work, valves and actuators for both.
  • Relocation of the supernatant return
  • Upgrading of the chlorine dosing system, with new chlorinators, controller and gas monitoring equipment.
  • Modification of the existing aluminium dosing to provide a new dosing chamber, dosing connection and lances and the replacement of the existing two alum dosing pumps.
  • Provision of new ph, turbidity and ultrasonic level instrumentation.
  • Refurbishment of seven rapid gravity filters including new plenum floors, supports and replacement media
  • SCADA/PLC replacement
  • Refurbishment of the pre-lime dosing plant

This significant upgrading and improvement programme of work was undertaken with close co-operation with Scottish Water Operations to ensure that a continuous supply of the essential potable water into service was maintained.

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