I'm just getting ready to renovate my basement, starting with the bathroom first. I've attached three pictures, the first one showing the toilet rough-in with (I'm assuming) the toilet vent behind it. The second picture showing a pipe coming down from the toilet vent and into the ground with the laundry washer connected to it from behind the wall. The third picture is questionable.
My questions are:
1) Where do I put my sink? Can I connect it directly to the toilet vent and still have the sink drain into the sewer line, or can I connect it to the pipe that is connected to the laundry (picture 2)?
2) If I do put my sink behind the laundry, can I use the opening at the very bottom of the pipe or is that used for a clean out.
3) What is in picture 3? It's located a few feet from the toilet rough-in and just filled with rocks. Is this the shower drain?