DWV design. New bathroom on slab. one vent pipe?

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McBV

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Thank you in advance for all observations and critiques.
After reading this forum, I’ve decided to post my DWV design. This is a small bathroom over a concrete slab. The plumbing under shower pan is 2’’ pipe, followed by p-trap and WYE, tilted 45 deg straight to the wall and up thru the roof. Everything downstream is 3â€dia. and connected to main drain. (This is a single story house in California, if that makes any difference). My biggest concern is: one vent for two fixtures - Is this a big no-no or I have to one way or another vent the toilet independently?
Thank you
McBV


slab1.jpg

view from under the slab:
slab2.jpg
 

McBV

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Hi,
The sink is combined with the toilet (the brand is Caroma). It sits on the top of the tank. This is a small 80”x 80” bathroom – I could not find a room for a standalone sink.
Thank you.
McBV
 
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