NTMWD Wylie Treatment Plant IV Filter Wall Repairs
The Wylie Water Treatment Plant (WTP) Filter project was undertaken to address critical issues within the Wylie WTP Campus. This comprehensive endeavor focused on rehabilitating and augmenting the existing filter walls, which had begun deteriorating. The Wylie WTP Campus plays a crucial role in supplying over 600 million gallons of water per day to residents of North Texas. Thus, it was imperative to develop a plan that allowed operations to continue providing essential water services while the necessary upgrades were carried out. The scope of work was meticulously planned, involving the careful takedown of approximately 1-5 filters at a time during scheduled shutdown periods. This strategic approach, while reducing water production, allowed the team to efficiently conduct the required repairs and return filters to service promptly. This ensured the uninterrupted supply of water to North Texas residents, providing reassurance about the project’s progress. The project began with work on Filter IV, believed to have the most significant damage among the filters. By addressing this filter first, the team aimed to assess the full scope of work needed for the remaining 19 filters. The project was procured through the Construction Manager at Risk (CMAR) method, facilitating the early implementation of the necessary measures for Filter IV. The scope of work for Filter IV included demolition down to existing concrete flooring, installation of new supports, under-drain blocks, and the application of multiple layers of filter media. Subsequent phases involved the repair of electrical infrastructure, hydro blasting to remove existing coatings, and implementing partial/full-depth repairs to mitigate water intrusion. Mechanical upgrades, including welding extensions for effluent piping and relocating air lines, were also undertaken. A significant aspect of the project was the installation of an 8-inch-thick shotcrete augmented wall to fortify the existing walls, providing essential tensile strength and safeguarding against future damage. Once completed, electrical and instrumentation systems were reinstalled on the newly augmented wall.
Contract Amount
$10,017,072
Completion Date
5/10/2004