Decided to take the kids to the amusement park for the day. What a nice day off, but missed the 90 lb jack hammer powered by a huge air compressor. That finally did the trick and took out the concrete. It's all about having the right tools.
The whole concrete/foundation thing has been a mini-"fiasco". First, thinking we would have to take out the existing concrete (where we need to push out), then after starting some demo, realizing it was extremely thick with rebar, rethinking maybe we could use it. Then going down to the Building Dept., showing them photos, sketches of what the concrete pad looked like and them saying, "Yeah, it looks ok, but you would need to have your structural engineer redo the drawings and resubmit for approval." He readily acknowledged it was all about CYA. Bottom line: you have to build to the approved drawings. If you want to build differently, submit new drawings. Our foundation and structural work is over-engineered. Both the Building Inspector and our framer looked at how the footings were constructed and said it was for commercial construction.
Advice to our friends who are also working with the same architect: ask him about the foundation footing specs. Our city does not require the amount of metal, width, depth spec'd on our drawings.
No plumber today, just Robert jackhammering away. I've got the inspector coming Mon afternoon to sign-off on underground plumbing. Hope the plumber can finish everything tomorrow.