What geo-environmental condition did not contribute to the May 2000 Walkerton tragedy?

Name: What geo-environmental condition did not contribute to the May 2000 Walkerton tragedy?
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Question

Quizplus · Accepted Answer

The buried artesian aquifer did not contribute to the Walkerton tragedy. The contamination of the town's water supply was caused by a combination of factors including the shallow overburden with little filtration capacity, a fast delivery fractured bedrock aquifer, and a nearby unsealed test well.

What Geo-Environmental Condition Did Not Contribute to the May 2000