Hi all, I'm new to this forum but thought it'd be a great place to get some ideas, or at a minimum, condolences.
I've posted a crude diagram of my existing basement sewer drain (unfortunately my scanner just died and I had to use this blurry photo for now).
All pipe is 4" cast iron, located below the basement floor. The house was built in the mid 70s and I am led to believe the pipe is 3-4' under the concrete floor.
I've had problems with backups at the floor drain and at the base of the toilet (bathroom on far right of photo drawing). So before a recent party, I had a plumber come out to rod out the line. While here, the plumber tv'd the main pipe out to the street (upper left of photo drawing, extending down toward the street). The good news, no roots and it all looked like it was in good condition. We also saw the 90-degree connector that came from the basement bath (bottom left of the photo drawing). As we pulled the snake back from the 90-degree tee, it dropped about an inch or 1.5" into some water. (This area is highlighted in yellow on the left side of the photo drawing). We marked the spot and the plumber said the only way to really fix this was to dig into the concrete and replace the pipe - roughly an $1800 job.
The party came and went without a hitch, but the very next day, water surrounded the base of the toilet again. I wasn't convinced that the backpitch we saw could be the cause of the basement toilet's problems, so I decided that at a minimum, I would replace the wax gasket and while the toilet was off, see if anything unusual was going on. When I removed the toilet I saw standing water in the sewer pipe - not good..
So out comes the plumber again.
This time the plumber wouldn't tv the pipe, but he did rod out this line from the toilet flange over to the sewer main (±20' from the right side of the drawing to the left side). The plumber says the reason there is standing water visible from the toilet flange is because the pipe is backpitched (area highlighted in yellow on the right side of the photo drawing - though admittedly the location of the backpitch is a total guess since we had no tv to see what was going on). This makes sense, but now my question is... what to do about it.
I'm wondering if some of you might offer comments or suggestions to help guide my decision. Of course I'd prefer to spend less money, but I also want to do it once and do it right. I've heard the ejector pump method would be the cheapest solution, but I'm not real excited about going this route. Something about having a gravity sewer seems preferable to me (until i see the bill i suspect). So here are my questions:
1. Should I go with an ejector pump solution? and if so, why?
2. If I dig up the pipe, any comments on jackhammering vs. saw-cut? Will jackhammering damage my foundation?
3. While doing all this work I figure I will install a shower drain, in addition to the existing sink and toilet. Do I need to be worried about new venting? No vents exist for the existing fixtures.
4. Would it be beneficial to consider taking the pipe outside and around the house to tap the main? This would be a long run, probably 50' or so, with the marginal benefit of adding cleanouts for my service main.
5. If I install new pipe beneath the concrete, should I replace the 90-degree tee with a 45?
6. Is there value in installing a backflow and/or gate valve between the main and the floor drain?
7. Any ideas to ballpark the cost for such work?
Thanks in advance for any help you can provide. I don't think I like my options :/