I just Googled for "buried cable locator" and got lots of hits. Maybe a
rental company has one.
You could pay a locater service a few hundred to come and locate it, buy a
$3,000 gadget or get a metal rod and push it in the ground around where you
think it is until you feel the characteristic scrape against PVC. Once you
find it in two places, try a place exactly between the two - you'll
establish the line and then all will become clear.
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