On Sun, 06 Nov 2016 15:33:48 -0700, Charles Bishop
wrote:

It's a 3" pipe, probably 4' down on average, and you need to get the
pipe out, even if in pieces, and new pipe down (ABS).

How wide would you make the trench, and is there a machine you know of
that would do this work that can be rented?

Oh, there may be sprinkler pipe in the path of the trench.

Is it possible to abandon the OB in place, trench along side and
connect new PVC? Irrigation lines can be fixed rather easily.