Formed Wall
Initially, I was thinking of underpinning the footing. This process involves digging out sections under the footing and then filling with concrete one at a time. I spoke with a neighbor who is an engineer, Nick Kleinberg, and went over the process. It was the conservative approach, as well as the most labor intensive and time consuming.
Asen came by on Saturday the 31st to see how the progress was coming. We started discussing the underpinning process. He had different ideas about the situation. His opinion was that a formed concrete wall would be the best. Because it was pored at one time, it would be stronger than a series of foundation sections. Also, he reasoned that more damage would be done to the existing footing disrupting it by hammering the rocks and material below it.
Bill & Chris
We started the work by setting the rebar in a 1 foot by 1 foot grid. Wherever possible the rebar would be set into drilled holes in the rock or existing masonry. A major issue to be resolved was how to hold the form in place during the pour. While the cement was wet there would be a tremendous force wanting to blow out the form away from the wall. Near the top of the form was the existing concrete block wall footing. We could drill into this, and use wedge anchors and threaded rod to bolt the form in at the top.
On the bottom there was nothing consistent to use. There were some very large rocks that we drilled wedge anchors into, but I was still concerned. Al has told me that there is nothing worse than watching a form move during a pour. Normally a form like this is shored up, but we had nothing to brace against. The opposite wall was 15 feet away and using this for bracing would restrict the access we needed to get in there and pour the cement into the form. If we poured a small base for the wall, this would give us a clean edge to bolt the form against.
Anchor bolts set in horizontally would hold the bottom of the form in tight with no chance for any movement.
I will have to call the inspector back in to check it out before we pour the new wall. The problem here is that the none of this is on the plans that were submitted to him. As far as he is concerned, I am a home owner run amok with all kinds of design changes that I am unauthorized to make. I spoke to the architect, Rich about this. He thinks that I should change hats and take on the roll as the Engineer of Record. As of now, the Building Dept does not know that I’m a professional engineer. But, I guess it’s time to move on.
The Pour
Scott finished the form before the Christmas vacation. The pour was the monday following Christmas. Weldon was 1 hour late, the truck arrived at 10:30 am.
Since there was not enough pitch for the cement to make it without help into
the wall, we had to use chutes to get it close, and then shovel it into the
wall. 
After it was all over, while I had Gary's help (Bob didn't show up) we went to Weldon to get 50 - 8" blocks to extend the outside back block wall. I had made it 2 courses too short. We loaded up the pickup and had to add a little air in the tires.
