At least that's what the city calls it.
But you may be interested in their technique.
At one end of the block, the workers dug down about eight feet to the
original sanitary sewer line. This line is a concrete pipe, about ten inches
in (outside) diameter with 3/4" thick walls.
Into this concrete pipe, the city pushes a PVC (let's call it PVC - it's
probably depleted uranium) pipe that's actually larger than the original
concrete pipe. They hammer this new pipe hard. The new pipe travels at least
1000' (to the next work-hole), fracturing the original concrete pipe as it
goes. They did some serious hammering - the ground shook. It frightened my
fish. Beer in the fridge went bad.
The city then goes into each backyard with an itty-bitty backhoe, digs down
eight feet and connects - through some magical process I haven't seen yet -
each house to the new pipe.
Prior to all this digging and hammering, the workers attached some
sophisticated electronic gizmo to the sewer, water, gas, and telephone
cables (in turn) and spray-painted the grass with mystical runes - of
different colors - to mark where these underground utilities traveled. The
electrical lines are above ground.
My son did ask one of the workers what happens to the, ah, sewage between
destruction of the old pipe and the eventual reconnection to the new pipe.
The official response was: "Oh, well..."
Anyway, the part that amazed me was the pushing, and resultant cracking, of
the original pipe by the new PVC conduit. The military should consider this
plastic pipe as tank armor.
The original concrete sewer pipe was laid, I imagine, when this sub-division
was originally built up: in the 1960s.