"Bill Stock" wrote:

-snip-
I wondered about an air chisel, but I did not see any bits long enough. I
guess an electric hammer is the next step up. I'll have to price them versus
a core drill (again).


Old concrete should yield fairly easily. Any chance of welding up
some long bits for your air chisel from rebar and some sacrificial
chisels? [you mentioned you had a compressor earlier- and if you
don't have an air chisel, Harbor freight sells them for less than $20
with a 1/2 dozen chisels]

Jim