George Leslie Ltd

Key Facts

  • Client: Scottish Water Solutions
  • Engineer: AECOM
  • Conditions of contract: NEC3
  • Contract value: £3,550,000
  • Duration of works: July 2008 – September 2009 (62 weeks)

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Wastewater Treatment Works

Holmpark PS

The works at Holmpark Pumping Station in Newton Stewart comprised the construction of a series of precast concrete shafts, together with collection, inter-connecting, and transfer pipelines to ensure that the installation complied with SEPA storm discharge consents.

The shafts dimensions were:

  • 15m diam; 8m deep transfer well
  • 9m diam; 7m deep storm well
  • 5m diam; 7m deep combined storm overflow (CSO)
  • 4m diam; 4m deep outfall collection chamber, with 800mm diam inter-connecting and storm outfall pipework.

New 700mm & 800mm diam collection pipelines were installed adjacent to and on both sides of the river. This included a 40m river crossing section, the installation of which was critically timed to avoid the spawning season of rare lampreys which are indigenous to this part of the River Cree.

A further 130m section of 6m deep drainage pipework completed the principal elements of the collection works.

Thereafter, 1.3km of 280 diam HPPE rising main, which include a 60m section of direction drilling below the A75 Trunk Road, transferred the flows to the existing treatment works at Machermore.

Careful construction was necessary throughout the project, which was largely undertaken both adjacent to and within the watercourse of the River Cree, with its rare species and SSSI status

Final testing and commissioning was carried out prior to turn of flows to prove the Storm Pumps capable of 600 l/s with Transfer Pumps being tested to 25 l/s and 50 l/s on flow and level control.

The works were undertaken under a Design & Build, NEC Option C form of contract, with AECOM as design partners.

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