Basement Sink addition

I'm starting a basement remodel, and I've been toying with the idea of adding a kitchenette with a sink along a diagonal wall. Problem is, how do I drain it? My basement is different than most. For example...

(See attached image as I explain this)

I know how I'm going to build the bathroom. I have sink, toilet and tub rough-ins for the bathroom, but the sewer pipe draining out of the house is actually above the basement floor. Therefore the sewage goes into a nearby pit, which I will have to install a pump in order to pump out the sewage. So far so good.

Now the kitchenette. The sink would be a little way from that pit. Even if I do run a pvc tube to drain into the pit, what is the proper way to drain into it? And how do I properly vent that kitchenette sink, along with the bathroom sink, toilet & tub?

Please tell me I don't have to dig up concrete. No books I've read explain what to do in a situation like this.

alexjag33 said:

Please tell me I don't have to dig up concrete ...

Click to expand...

I am pretty sure you do not, but I will be listening to what others say about your venting. I have a nearly identical project underway in my own basement. I have already cut the concrete and installed the toilet flange and sump, and the kitchenette drain connects to that. However, I have yet to figure out all the venting.

Best way would be to put the piping under the slab...
What venting is already in place in the basement for the existing waste and vent piping? (what pipes come up in the wall of the new bathroom?)

Venting

The bathroom is bare concrete at the moment with only framing around the perimiter. However, the builder put the drains in place for a bathroom. Nothing for a kitchenette though.

There is a vent stack in the middle of the room (see diagram) poking out of the ceiling. It is reachable even though it's outside the bathroom. I have the walls framed but pvc can run thru the joists.

Oh- and my diagram is slightly wrong- the sink drain should be in the middle of the framing wall, not in front. I attached a slightly more detailed image of what my basement currently looks like.