I finally got a hold of the plumbing inspector. Where I live the inspections are strictly enforced when you go to sell your house. The city gets a copy the original plans from the builder, and in order to sell your house you have to a city inspection. If the inspector comes and finds major renovations not on the plans, the renovations are considered null and you could be required to rip it out. Not something I am will to take a chance on.
The slope only has to be 1/8" for every foot. ALL "Air Admittance Valves" are illegal in the state of Illinois. Pipes under the concrete must be a minimum of 2".
So it looks like I am off to rent an electric concrete saw.
I am going to have the contractor come back out and give a new estimate for just laying the pipe and doing the vent.
I rented an electric conrete saw and electric breaker (jack-hammer) saturday morning. The saw used some kind of composite blade that wore away as I cut, so I had to buy three(3) blades. Total cost about $130 (I found a rental place that was not open on sunday, so I just got charged for a one day rental).
The sawing was the worst for me. The saw was not on a cart or anything, I had to get on my knees and pull it across the floor. After about three(3) hours of this, my hands were killing me, luckly I had a really good pair of knee pads. If anyone else tries this hold out for one that you can stand up with. also look into geting one with a dimond tipped metal blade. I ended up sawing about three inches into the concrete.
Also I would like to note that this creates a lot of dust, A LOT OF DUST!!! Get a breathing mask and some goggles, put plastic over any air vents and around/on areas you do not want to be coated, open a winodw and put a fan blowing out in it. I have done drywall sanding many times, and this seemed about three times as bad to me.
Using the Jack-Hammer was actually pretty fun. A little jarring, but fun. Hauling the broken conrete up out of the basement was not to bad, just had to remember not to fill the bucket up too much (lots of small loads was easier).
Shoveling the rock below the concrete was an unexpected thing. I had no idea that the pipes woud be two(2) inches below the concrete. I know it sounds ignorant, but I figured after removing the concrete I would be done.
The plumber said that he would need three(3) feet of pipe exposed, with two(2) inches dug below the pipe, and tweleve(12) inches out on either side of the pipe.
Well that is my experience thus far.
Side note: I had three estimates done, two were about the same price. But there was a diffrence concerning the vent pipe. Apparently where I want the sink, the vent pipe has to go up into the floor joists and then over to where a vent pipe is. The problem comes in that the only exposed vent pipe is about two(2) inches LOWER than where the new vent pipe would come out at.
The first did not raise a question about it, but looked like he was going to use the lower pipe. The second said he was going to check on a variance to use the lower pipe, and mentioned something about an island sink vent. The third seemed completely confused and would not give an estimate because he did not want to under/over quote (he was a junior apprintce and said that he wanted a journeymen to come out and look at it).
Please post with any comments or concerns, as you can tell this is all greek to me.