"ATP" wrote in message
...
snip-----

There were a lot of flourescent ballasts that contained PCB's, and a lot
of
old shelf stock around. Some of them are undoubtedly still in service.
There
are still some very old utility transformers in service that contain
PCB's.

If memory serves, oil in transformers can be exchanged and the transformer
cleaned such that if the PCB level is 50 PPM they can still be used. Not
all equipment was replaced as a result, although the vast majority of the
PCB's have been replaced.

Harold