Do you have any amateur metal-detectorists in your area? I'm sure they'd love the challenge (and a share of the proceeds when they find that hoard of coins ).
I suspect its just run in plastic pipe and you will have to check the route and depth before you start digging and laying something else, if your not digging then if its already in ducting then I wouldnt worry at this stage, always usefull to have the info though.
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