Plumbing question with our residential basement remodel

[mradel]

My plumber says the height of the drain from the kitchen above is correct.

Maybe I’m over-thinking the height but I think it should be 12″ from the floor not 32″ as shown in the picture on the left hand side.

My concern the bathroom sink drain is below the kitchen drain. Is he right?

 

[Reach4]

The biggest problem is that drain from the kitchen from above is discharging into the vent for the lavatory.

Also, the vertical to horizontal from the kitchen should be a long sweep.

 

[Sponsor]

 

[hj]

YOU CANNOT "wet vent" the lavatory with the sink on a higher floor.