Basement Plumbing rough in....

I would appreciate anyone's help. I am a DIY'er but have never touched plumbing before. I am wondering the correct way to finish the rough in that was completed by my house contractor. I have attached a photo of what is existing and wondering what the two 3" pipes upstream of the WC is? i assume one is for air and one is a cleanout? The problem is which is which. Also I am wondering where I can tie the 3" air into. Must I put another 3" outlet up through the roof, can I tie it in to the existing plumbing(In my attic) or can I tie it into the ejector pit. My gut feeling is that it should be extended through the roof. As well I was wondering why the builder capped a 2" air vent in the ceiling of the basement(It ties into the upstairs plumbing).

Helpful Plumbing Hints for Residential Construction by Bert Polk Plumbing Inspector Lincoln County

There are many ways a novice can go wrong on a job like this and only a few ways to do it right. It is next to impossible even for pros to give you an on-line course in plumbing. Sometimes the best advice we can give to a DIY is to call a plumber. It usually will save time and money in the long run, and your job will not only work properly, but it will pass inspection.

Unfortunately I have asked two plumbers and they both gave two different options and opinions. Neither the township would accept.

i'm not a plumber, but i can tell you the 2" capped line you have in the ceiling is a future vent. it is meant to use when you hook up the bath group. the shower is wet vented thru the sink and the vent from the sink goes up to the capped line in the ceiling. the first capped fitting on the right side of the WC looks like a cleanout location. the second looks like it could be a vent for the WC if it was required to have a vent. you would extend that one and tie into the 2" vent in the ceiling if the WC is required to have it's own vent. that is my take on it, from a DYI'er's perspective.

You asked two plumber and neither knew how to do this by local codes? I would question their qualifications. If they are licensed in your area, they certainly should know the local code requirements. Now you are on a forum made up of folks from all over North America and even some from other continents as well and you expect we can give you advice that will enable you to pass code? Code requirements vary widely from place to place even within a single country. What is legal in British Columbia may not be legal in Ontario. If it was me, I'd get a more reliable plumber and if/when you do hire one, require him to sign an agreement that if his work does not pass inspection, he will be responsible to redo any and all work necessary to meet code at his expense. Remember, it's not just doing the job so that it will work, but it also has to be approved by your local inspector.

dwv

quote; they both gave two different options and opinions. Neither the township would accept.

TWO plumbers who were there and they could not agree on what you have, or how to do it, and NEITHER was acceptable to the city? I am not sure what that means, but if that is exactly what happened, HOW do you expect us, since we have to rely on your drawing, to do any better? IF your drawing is correct, then you DO have some serious issues with the underfloor piping. It also does not make much sense because it is NOT how most plumbers would have installed it.