It was started by CMA, Hanjin follows suit as they obviously encounter the same problems!

Here their announcement:

Quote

Due to barge congestion at the Port of Rotterdam a

congestion surcharge (CGS) of EUR 18.00

will be charged per container (full /empty) for all barge transportation to/from the Port of Rotterdam (NLRTM) as from August 1st, 2014.
(Scope: All trades and bounds)

Unquote