Update 3/1/2011.
Thought I would update this thread I started weeks back.
So the concrete had been in now about 8-9 weeks give or take. We had the slab tested by a structural concrete engineering company and it was found to be very solid over 4000 PSI. The rear of the garage is 8" thick. There is still an 1/8" of "crust" on top of the slab that is basically separated from the slab itself in some places, not all. I would say maybe 25% of the 750 sq foot floor. I have driven cars on it and it has not cracked or give way although no doubt it will over time. Have not done anything to the floor yet.
Four days after the original pour was done and it was obvious it had gone bad the concrete contractor who did the pour had the transit mix company who provided the concrete come down and take a look. A representative of the transit company came and walked around the floor. I was there with him and we walked around the floor, noting all the hollow spots and the mottled color. (it was supposed to have been very white, we had coloring added to the mix). The representative said basically nothing. He agreed the floor was badly done but didn't point fingers or blame.
Although I have no way to know for sure I think the contractor was blaming the supplier, and the supplier the installer.
So what happened? The transit company representative told me that he would come back tomorrow with the contractor and we would hash out our options. That was the last I ever saw of either of them. To this day I have had no contact with either party. They never showed up and never came by.
After having the slab tested and found to be solid, there was no way I was going to pursue ripping it out. My biggest concern was it was structurally flawed and then we would have had to pursue it legally to have it repaired/ripped out. The contractor obviously decided that for the 3K I owed him for the floor, he could not fix it (by grinding, polishing or some other means) for less than that so he just walked away. So I have ended up with a superficially flawed floor, but an extra 3K in my budget. Right now I'm not doing anything but in the spring-summer I may have it grinded and polished, or grinded and epoxied. Or debating Racedeck. Prices to grind and polish are quite high and there are not too many guys here that do it.
BTW, the contractor never put a lien or any other action against the property as had been discussed. He actaully was a pretty good guy and we got along well. I think he was MORTIFIED at the result of his work and embarrassed as hell. He figured the trade off for the lousy job was it was free. He left some forms, thermal blankets and other stuff here as well.
I could have been really hard about it and demanded it be ripped out and replaced. But time has lessened the initial anger and knowing that it is structurally sound has relieved the stress. I was going to have it polished anyway so nothing really changed in that regard, I just have his money to put towards the eventual finished product.