Open invitation to tender, deadline 25.09.2013, for environmental monitoring during the construction of the 1,138 m Galgenbuck tunnel on N04/06. Duration of contract 01.12.2013 to 31.12.2021. For further information go to http://www.simap.ch/shabforms/servlet/Search?NOTICE_NR=786319. Contact Ofrou, Winterthur, e-mail beschaffung.winterthur@astra.admin.ch. Visit http://ted.europa.eu/udl?request=Seek-Deliver&language=en&docid=273157-2013. 35/13.