Welcome to Just Answer, I will do my best to help with your problem
Do you have a sump pump pit in the basement?
If you're sure there are no traps that have lost their seal then the only other likey cause is a broken vent line
Is the fresh air vent for the house trap intact?
as far as I could see from the side of the house to the elbow and then inside next to the house trap intact as well
why is the smell concentrated in that part of the house? the front of the house in the basement where the the house trap is. nowhere else
That's why I asked about the fresh air
typically there are no other vents in that area
that vent doeasnt travel a long distance just five or so feet up and then maybe three to the side of the house. No noticeable damage
Then I suspect your patch job is not gas tight.
The only likely sources for sewer gas in a house are a broken vent or a dry trap
or a busted line below grade that's seeping into a perimeter drain to a sump pit
what about their explanation that it smells like a dead animal instead? are they trying to get out of it the easy way? what's another possibility for that kind of smell? mold is kind of humid smell not rotten. or is it?
I dont know that we have a sump pit
Mold has a musty smell. A dead animal usually doesn't have a sulfur type odor, sewer gas does
But odors are pretty subjective.
I think we go into the public sewer main
That doesn't change my answer
what should be my next course of action?
I'd call in a plumber to look into this. If the patch job guys were plumbers call a different one
ok. If a video inspection is done. Should I expect to see nothing going through the pipe or the patch job is just around the object that went through and they were to seal any hole?
should I excavate and replace the part of the pipe that was damaged by this object or was patching enough/
Unless there is an unobstructed path for the sewer gas to escape from an underground piping defect it's very unusual for a broken sewer line undergroung to be the source of sewer gas odor
I'm not a fan of patching anything
I'm beginning to feel the same. What should I expect to pay for excavation and replacement of that fragment of the pipe? there is access to the place where it is located
It's next to impossible for me to say since i don't know the onsite conditions or the condition of the adjacent piping. Even if I was onsite the best I could do is give you a (pretty wide) range since there is no way of knowing if more than just a small section will need to be replaced.
ok. I guess Calling another plumber should be the next step. One last thing. When I remove the plugs on the house trap I put my nose close to the opening and the smell coming from there are different. Not as slfury (if that's a term) Does that tell me it could be something else or sewer gases could also be getting into that particular room through a different source?
Like I said smells are very subjective so your description doesn't help much. There is only so much I can do from here, these are questions for the guy doing an onsite inspection
ok. Thanks for your help