Where is the water coming from? You need to fix this issue at the source, not floor box.
I totally agree!
How high above sea level are you, if only 20' you might as well be at sea level... ? ! (sorry I didn't look at exact address)
Is the building foot print down hill from a mountain or at the bottom of a cliff ?
Between MS and "ALABAMA", they get the most rain in the SE per year as I recall.
There's more going on here than you know the slab or under slab filling with water is
either a missed un-addressed issue, or a oh we can work the slab, damn the torpedo's...
Poor run off, stopped up drains, a stopped up roof drain in a key part of the building.
Was there Contruction or alteration in the immediate area. Construction disturbed a natural spring. It just get's endless.
If they want to just say it's water in the floor boxes, fine, Good Luck.
You going to clear the lines? Are your going to QA and start a record on the Service and Circuits?
I'd suggest having the water tested if you can't qualify or discount anything otherwise presented.
As A condition of you sealing anything, You need to know what your sealing from and have
a clause out otherwise.
Have the water tested... Call ahead and ask questions of what you need for a sample
ask how many samples and get details.
20 year, 50 year, 100 year -Floods, I've heard all the expressions lately, we've all felt most of something on the East Coast....
& yes they could be sitting on slate a flat of natural mass and there's other problems to address to cure the ill.