I would be greatful to hit water when placing a grounding plate. The inspector may be concerned that if the plate is in water above the frost line, when things freeze you loose conductivity. But you guys are in Canada and the frostline may be somewhere below permafrost where the earthcore warms things up. Then the above would be silly.
The other possible concern would be over how fast the ground plate will frostheave to the surface. There may be no getting around this either. Talk to him and see and get it in writing with the code section.
Finally here are some extra spaces, this laptops space bar is not always working. I think I got them all in, but justincase.