George Leslie Ltd

Key Facts

  • Client: Scottish Water Solutions
  • Engineer: Entec
  • Conditions of contract: NEC Option C
  • Contract value: £6,000,000
  • Duration of works: October 2007 – October 2009

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Water Treatment Works

Loch Ascog Water Treatment Plant Upgrade

Loch Ascog Water Treatment Works is located on the Island of Bute and had a history of PCV failures for bromate, turbidity & manganese. In addition the Drinking Water Quality Regulator had determined that the level of disinfection control was inadequate to ensure consistent bacteriological compliance. There were also issues with respect to taste & odour, relating directly to algal blooms in the raw water source.

The works entailed the construction, installation and commissioning of a new secondary treatment process comprising 3 nr Rapid Gravity Filters.

Also included with the new works were new chemical dosing plants (Sodium Carbonate, MSP, and Sodium Hypochlorite), and a new portal frame building was also erected to house the new equipment along with a new MCC.

The existing measuring house building was converted into a pumping station to transfer the flows from the existing slow sand filters to the secondary treatment process.

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