I apologize if this is not the correct board to ask (landscaper)

Long story short, my mother (who lives in Hammond) recently had a sewer clog. Her street was originally developed by a private developer and the sewer is run through his company, not the city.

There were no visible clean outs (turns out it was buried 4 ft underground) and she could not get a hold of the company to identify where the lines were run. She had the city come out to see if they could figure it out and they couldn't find the line either. Being that her toilets were back flowing into her house, she had to resort in hiring a plumber to excavate her yard to try to find the line. They finally found and fixed the problem (and she now has 4 clean outs), but now her yard is pretty torn-up, so I am hoping someone knows a reputable company that is able to do extensive yard repair. As stated she lives in Hammond.

I really appreciate any assistance.