Parrott is correct - lots of airports worldwide are in the same boat TBH
Two pipelines is twice the cost and four times the legal challenges and aggravation - then you have to leave one empty or spend time balancing flow between the two...
One issue is just how deep it was buried and how it was marked.... clealry a fault in both.
But the farmer had probably forgotten about it and the contractor didn't look
As for repairing large diameter oil pipelines I'd rather trust a Canadian expert who does it day in, day out than some local plumber