Sewer smells in occupied home near Stapleton

Has anyone heard of an issue with sewer smells in the homes near the old Stapleton airport? Is this conducive of the area? Near E. 56th and Quebec.

Plumbing has been both inspected and scoped, studor vents replaced, air quality tested, and yet no solutions to offer. It is in several homes in that neighborhood. (One owner did find a studor vent behind drywall.) These are new builds from 2015.
PLEASE if you have any suggestions, I would greatly appreciate it.