An area of Windsor, Ontario’s west end industrial area encountered a problem when hydrogen sulfide gas caused a concrete line and nearby manhole walls to turn to mush, creating sinkholes along the four-lane Ojibway Parkway. The city plans to use a trenchless, cured-in-place pipe solution to rehabilitate the concrete pipe.



No, it’s not the edible kind. But one recipe for turning concrete into a “mashed potatoes” consistency is by combining different types of sewer effluent.

Such was the case in Windsor, Ont.’s west end industrial area, home to a variety of companies from food processors to steel manufacturers, warehousing and even the new Gordie Howe International Bridge now under construction.

Earlier this year a City of Windsor parks official doing the rounds noticed a couple of sinkholes along the four-lane Ojibway Parkway, a commuter route near the Detroit River running into central Windsor.

“Our maintenance department was called in to investigate,” explained Andrew Lewis, a City of Windsor right of way and field services co-ordinator. “It was at that point that we realized that there were some issues with the existing concrete pipe in the ground and the manholes.”