Phone conversation with building department official regarding pumping wastewater from Casa sink. Would have to provide letter arguing why, given the circumstances, it is necessary to pump the water. Necessary and acceptable because: a) slab on grade means we can't investigate existing sewer line depth (can't establish if positive slope is possible) b) no drawings or information showing existing sewer line condition are available c) would only be serving a handwash sink (not in a kitchen) d) would be served via a plenum over a classroom and hallway (not crossing a food prep area).