Show the home owners an mpeg file of a transformer blowing up.

Call an electrician!

I would also say the soil seems slightly acidic [Linked Image]

To prevent this from happening one I would fasten a tin ingot to the EMT below soil level. This would provide the same protection as the anode on a hot water tank.

Of course, at this stage Plastic is the way to go to replace this and prevent it from happening again.