We are in the process of building a bathroom in the basement of our 1920's house. The main drain line in the floor of basement was not where either the plumber or I expected it to be, and we ended up cutting up more concrete floor than necessary. All the plumbing work is complete and the trenches have been backfilled and closed up. The bad part is that I should have been standing over the workers as they covered up the line. Yes, they brought in new gravel and new concrete, and they didn't bury any of the debris, but when everything was said and done there was a ton of dirt - mostly clay - left over. We have never had water in our basement. All our neighbors have problem with water. When the floor was open and the material was excavated, it filled up with water the next day. I'm concerned that we may have had an impermeable clay layer under the floor that kept the basement from getting wet. Also, I'm worried that they didn't get very good compaction or there wouldn't have been so much material left over. The new concrete is at least 2 inches thick. We're about to tile the floor and I'm worried that (1) the floor may sink in the future and (2) water is going to start leaching through the floor now. At this point, I guess I just need to proceed and hope nothing happens. Maybe I'm over thinking this and just mad with myself since I should have thought it all out before the fact. Yeeks. Can anyone offer any words of encouragement?