Re: [Nexus] OoC 34: If it exists, we have role-played it. No exceptions.
You could just buy a pressure-washer and put the drain in the main lobby in a corner somewhere. Then you could just spray all the pulp out into the drain.
Also, with the base underground, having drains in the floor isn't suspicious, it's a must. Flooding would be a real problem that close to the river.