I've got a shop that is a few hu dred feet from my house. When I built it I ran water but no sewer as the shop is on lower ground than the house/septic. I have a hose faucet outside and a sink inside. The sink was on an exterior wall but I'm moving it to an interior wall. Currently the sink has no trap and a drain that dumps straight out the back wall. Its only used for rinsing hands and such (no chemicals or solid waste). I have jack hammered up the concrete to the interior wall to lay the drain and water lines. I had planned in running 1 1/2 or 1 1/4 pipe for the drain and running it outside like the last one. The total drain line will be about 15-20ft from sink to outside. I know normally any drain under a slab would be 3-4in PVC. Will a 15ft run of a smaller pipe be fine for this? I figure that since there are no solids and since it isn't tied into a sewer or septic it will be just fine, but I wanted to get opinions.
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Shop sink drain line