December 15 (SeeNews) - ViK Burgas, the water utility serving the Bulgarian city of Burgas, said that it has signed a 5.3 million levs ($3 million/2.7 million euro) contract for the expansion of a water purification plant in the city with companies Sregi, GIS Aqua Bulgaria, its parent GIS Aqua Austria and a tie-up between the first two firms.