Water leak after new sewer lines and keeping tenants happy

[Jordan Thompson]

Hi all,

Just last week, a plumber completed sewer line replacements in each unit of my duplex.  The cast iron was rusted through causing backups, so an insurance claim was filed, and 2 new PVC lines were installed under slab from appliances to septic tank.  Flushing strength is good and I am working towards either repairing flooring and other damage myself, or hiring someone. 

Last night (5 days after repair) it rained ALL DAY and the tenants sent a video of water between the old stick down floor and the new LVP I installed on top of it (this was installed earlier this year before the backup, was cut through for the sewer line replacement, and will need replacement in the living room).  I have never had an issue with this, so my first inclination is that the most recent in-depth repair must be part of the cause, although I don't believe correlation = causation all the time... The plumber is returning today to help identify the source and we still need to confirm if just 1 unit or both units have been affected with this water infiltration.

So far my tenants have been very patient, and I have been expedient in making them and their living conditions a priority. I'm kind of getting lost on where to go with this problem aside from the plumber returning; Any concrete and sewer gurus have some advice on the leak?  Other than my expedience, what more can I do to keep my tenants as happy as possible?