Tunnel Business Magazine

OCT 2018

TBM: Tunnel Business Magazine is the market leader for North America. TBM is written for leading professionals in all aspects of tunneling and covers project stories, design elements, contracting strategies, legal issues, new technology and more.

Issue link: http://digital.tunnelingonline.com/i/1042145

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Page 17 of 47

TUNNELINGONLINE.COM 1 8 TBM: TUNNEL BUSINESS MAGAZINE // OCTOBER 2018 In recent years, public agencies have become increasingly strategic about their approach to managing infrastructure – largely due to the realities of aging assets and tightening budgets. Infrastructure asset management with an eye toward systematic rehabilitation and replace- ment is now the norm, and new and cre- ative financing schemes are helping to ease the burden on rate-payers. The Region of Peel in Ontario, which provides drinking water and wastewa- ter services to approximately 1.4 million residents in Brampton, Cale - sissauga in the Greater Toronto Area, has taken an additional step. In an effort to optimize the performance of the waste- water collection system, maximize its useful life, and minimize life-cycle costs, the Region of Peel recently developed a new set of standards for the design, con- struction, and rehabilitation of its sani- tary sewers. The standards address four key areas: • Pipe material • Waterproofing and corrosion pro- tection • Testing of the constructed pipe, and • Human access considerations One of the first projects to implement the new standards was the Twinning of the East Brampton Trunk Sewer. The new sewer was built with materials that would assure longevity of the built asset, and was internal pressure tested with water post construction to assure that it was leak-free. A leak-free sewer reduces treatment costs by eliminating extrane- ous water entering the sewer systems. Twinning of the East Brampton Trunk Sewer The Region of Peel Water and Waste- wa ecognized the need to twin the existing trunk sewer due to capacity deficiency servicing existing and future needs of Caledon and Brampton. The Region retained Associated Engi- neering to provide engineering services for the preliminary and detailed design of the trunk sewer twinning. The resulting project to build a new parallel sewer included approximately 5.2 km of 1,500-, 1,650- and 1,800 mm ID sewer from near the intersection of Queen Street and Goreway Drive to south of the intersection of Highway 407 East and Steeles Avenue East. Construction of the twin sewer com- prised approximately 2.0 km of 1,800 mm ID pipe, 2.87 km of 1,500 mm ID pipe and 260 m of 1,650 ID pipe, installed in four- teen drives drives ranging from 95 m ( 312 ft) to 820 m (2,680 ft) in length. Of the fourteen drives, five included some curved components, some with multiple curves. Ward and Burk otunnelling Ltd. elected as the microtunneling contractor for the $40 million project. Construction started in y 2017 with all tunneling completed in April 2018. All internal pressure testing of the new sewers has been completed. "The Region of Peel had trialed pres- sure testing on a smaller project but this was the first time it had been done on a large-scale project and large diameter pipes. We had to ensure the gravity sew- er pipeline could withstand 50 psi inter- nal pressure after the tunnel process, so we worked with the pipe manufacturer, Decast, to test the pipe at their factory before we used it in the field," said Ward & Burke Director John Grennan. "All the lines were successfully tested signed off, and the client is happy." Part of the Region of Peel's new standard called for pipe to conform to AWWA C302 standards. It had been Ward & Burke's previous experience in Under Pressure F E AT U R E S T O R Y

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