3 holes in concrete path trying to locate mains water leak.
3 inches of concrete over 18 inches of gravelly soil.

Transpired 2 problems under the 2 foot of pavement of water board supply
pipe
but I still have 3 holes to deal with after the backfill has settled.
The original problem a hole in lead pipe one foot from their water meter
but also to the amazement of the water board bods. The meter installers had
just
push 'fitted' a plastic-pipe type connector on to the end of the lead pipe
and not
a compression fitting - although not actually leaking it could easily be
rotated
by hand.