Documentation of basement evidence of water intrusion from the south wall

ON MAY 31 while in the Social Hall, I noticed that there was cracking in a certain section of ceiling, and blistering paint and cracking on the wall near the ceiling. This water-damaged area is located below the south wall of the sanctuary. Presumably rainwater has run down from above. 

Is the damage evidence of leaking during this past winter? Or is it a holdover from before we had the south wall waterproofed last July? Unfortunately, I do not know the answer, because I did not think to take baseline photos in the basement at the time of the waterproofing project. (Live and learn!)

So now going forward, we need to monitor this area carefully after each rainstorm. Taking periodic photos and testing with a moisture meter would be advisable. And to that end, this post—below the jump—documents the present state of things.…

Photos show the upper wall, proceeding from right to left. (As usual, click/tap on a photo in order to enlarge it.)

The map shows the location of the area in question, relative to the posts in the middle of the room. This is equivalent to roughly the 2nd and 3rd windows (counting from the eastern side) in the sanctuary.