City of Cranbrook council Feb. 22 approved a remediation option for Mount Royal Estates underground infrastructure and roadway repairs valued at approximately $3.83 million.

The required work follows the City of Cranbrook filing a suit to recover incurred and anticipated future costs associated with repairing the infrastructure at the site of Mount Royal Phases 1 & 3 residential developments, outlines a report to council by Curtis Penson of Engineering and Development Services.

“The suit was settled for $1.75 million. Staff are recommending that the monies paid to the city pertaining to the Mount Royal Estates Litigation are used in 2021 to fund the costs necessary to repair the failed infrastructure.”

Penson explained staff worked with McElhanney Ltd. to present three options to council that provide a level of risk of further settlement versus the estimated costs of repair. The options include replacing a section of sewer main along Mt Royal Drive due to grade issues. The options do not include any upgrades work to Abel Avenue due to its current condition.

Council opted for the recommended second option – a moderate to low risk alternative with a cost of $3.83 million.

“The repair work for this option includes removing half of the trench fill (approximately 1.5m) and building back up to the surface with an engineered fill that includes geogrid and geosynthetics. Before placing the engineered fill any soft spots and large settlement areas would be replaced to a deeper depth. Any failed curb, gutter and sidewalk would be replaced. There would be some risk for settlement to come through to the surface, however, with the depth and strength of the engineered fill the probability would be greatly reduced,” the report noted.

Council approved the money paid to the city from the Mount Royal Estates Litigation to be used in 2021 to fund the costs necessary to repair the failed infrastructure including engineering costs, and the additional $2.08 million in costs be funded from the annual Capital Roads Program.

The city reports it has spent hundreds of thousands of dollars undertaking a significant investigation of the underground infrastructure and found a section of sanitary sewer pipe, a manhole and several catch basins require replacement. The remaining underground infrastructure was found to be sound.

The approved repair work includes removing half of the trench fill (approximately 1.5m) and building back up to the surface with an engineered fill that includes geogrid and geosynthetics, then paving.

Before placing the engineered fill any soft spots and large settlement areas would be replaced to a deeper depth. Any failed curb, gutter and sidewalk would be replaced, the city said.

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