George Leslie Ltd

Key Facts

  • Client: Scottish Water Solutions
  • Engineer: Biwater Leslie Joint Venture
  • Contract value: £1,234,000
  • Duration of works: March – November 2005

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Wastewater Treatment Works

Salen Wastewater Treatment Works

The coastal community of Salen lies on the east coast of Mull, some 16 km south of Tobermory. New wastewater collection and treatment facilities were required in order to comply with the requirements of the Urban Waste Water Treatment (Scotland) Regulations 1994 and the EC Bathing Water Directive.

The work consisted of upgrading the existing sewer to direct the flows to the new treatment site, the construction of a new primary treatment works adjacent to the existing main sewer outfall and a new Combined Storm Overflow / pumping chamber to provide some of the storage required to limit storm spills.

Wastewater flows by gravity from the area collection system to the new Transfer Pumping Station. This pumps Formula A flows via a distribution chamber into 3 no. new septic tanks providing primary treatment through solids settlement, grit removal and sludge storage. From the septic tanks, the effluent passes through a new Copasac chamber and on through a sampling chamber to a final effluent pumping station which discharges through a long sea outfall which extends out beyond the Salen bay area.

Storm overflows in excess of Formula A pass through new screens and are discharged to open water via the new outfall manhole and the existing outfall pipe.

The sewer system for the small, 6-house community at Ardmor Road was also upgraded, with a new gravity sewer pipeline laid to a new septic tank installed on the existing northern outfall.

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