Here's what it looks like to me....
I believe the slb, etc., were installed with the original service as the water bond (to drain stray elec from water piping).
At some later date, someone decided to 'ground' their system, and took the shortcut of attempting to tie a "gec" into the water bond, using the u-clamps.
If so, this shows a basic mis-understanding of the purpoese of the two systems.
As for the receptacle, well, the weather-tight spec applies to "wet" locations, and it never rains in southern California.....:-)
