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I'm installing a basement bathroom group in a new home and have a few questions based on the attached basement plumbing layout. 1. Do I need a vent closer to the WC? If yes, how close? What is the code? 2. Is 1/8" pitch enough for a 3" line to a lift pump basket 60' away? That's about 7 1/2"...

Building a new home and want to make sure I have the DWV correct for the basement bathroom group. (not a professional) See Attached Image What should be changed? Does the WC need a vent? Any issues 1/8" pitch on the 3" PVC? - it's a long run. I might be able to do a bit more pitch but 1/4"...