The foundation stone for the waste water treatment plant that Riko will build with the Hidroinženiring company was laid by the Prime Minister of the Republic of Macedonia, Mr. Nikola Gruevski, in the presence of the Mayor of the Gjorče Petrov municipality, Sokol Mitrevski, the Minister of the Environment and Physical Planning, Nedžat Jakupi, and the Director of Riko, Janez Škrabec.