Is it an acceptable drain/venting arrangement?

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mbmsv

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Ontario
Dear experts,

The picture below shows a drain pipe in the basement. There is a toilet in the powder room above that sits directly on the top of this pipe. The two side branches are drains from the powder room sink and a laundry sink. Each has a separate vent pipe. There is also a drain for the washer joining the drain just below the P-trap under the laundry sink. Is this arrangement acceptable in principle and in Ontario in particular?

I've added a drawing showing the arrangement...

Thank you!

powder_room_stack.jpg



Powder_Room.png
 
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