So what I'm gathering from 682 is a horizontal plane 2 feet above the highest normal water level (or "electrical datum plane")?

Here's the thing I'm looking at. The customer has electrical equipment that they are already using within this area via extension cords. There's a concern about power tools and such being dropped into the ponds. This is already a possibility should they use 40' of extension cord and what is currently present. Placing a GFI recept at 2' above the top of these ponds per what I got from 682, PLUS I would also keep the recepts >6' from the ponds, being that this is the de facto power cord length for all things from radios to refrigerators. Thus not allowing anything to happen that couldn't already happen under current conditions. Should someone want some tunes while working in the ponds, without an extension cord, the radio should be kept far enough away from water to negate it being a hazard issue.