ASCO successfully tendered this $5.7 million expansion of the Hawkesbury Water Pollution Control Plant expansion. Construction commenced in December of 2004, working through winter condition and was completed March 2006. The project consisted of the construction of new equalization tanks, a sewage bypass diversion chamber and sewer, new pump room, and a new disinfection building. The project also involved the upgrade to the raw sewage pumping station mechanical and electrical systems, new process controls and instrumentation.

Due to proximity of the Ottawa River and a rock anchor system, the concrete tanks were constructed using an extensive dewatering program.

The existing plant had to remain in operation while the upgrade was being constructed. As a result, there was significant coordination related to replacement of existing components, such as the new raw sewage pumps, electrical power and controls systems, in order to ensure uninterrupted operation of the facility and an extensive commissioning program to bring the new facilities on-line.