GEORGE LESLIE LTD CIVIL ENGINEERING CONTRACTORS MUIRDYKES SUPPLY AREA WATER MAIN REHABILITATION WORKS This project in the Muirdykes RSZ covered South Paisley, Johnstone, Kilbarchan, Linwood and Howwood and comprised the Design & Build of 177km of water main rehab and upgrading work on the public water trunk and distribution supply network. The objective was to satisfy the DW5 criteria to reduce the high levels of manganese which had resulted in severe discolouration in the water supply. Detailed design work included: analysis of historical records, street-by-street surveys, extensive trial-hole site investigation and non-destructive testing of the existing pipelines, from which the most cost-effective intervention solution was developed in compliance with the ‘DW5’ methodology. The design was also subject to regular review and governance approvals by client stakeholders before final adoption. Extensive stakeholder consultation and approvals were necessary prior to commencing on site, to ensure traffic restrictions and road closures could be effected and private land entry agreed. Close co-operation with Scottish Water’s Customer Service Delivery teams ensured that planned interruptions to supply were minimised and close co-operation with SW operations teams enabled reconfiguring of the network to maintain supply to customers wherever possible. Across the programme, some 25km of pipeline was relined, with the remainder subject to a variety of intervention techniques ranging from simple swabbing and flushing, to the more intrusive slip-lining and pipe-bursting. On unavoidable instances, complete pipeline replacement was undertaken. Through innovative design and efficient delivery techniques, out-turn savings of £500,000 were realised on this £3m programme of work. CLIENT: Scottish Water ENGINEER / DESIGNER: AECOM CONDITIONS OF CONTRACT: NEC Option C DURATION OF WORKS: Nov 2011 – Nov 2012 CONTRACT VALUE: £2,911,760 Blackbyres Road, Barrhead Glasgow G78 1DU T: 0141 881 9131 F: 0141 881 8265 www.georgeleslie.co.uk .