Under the framework agreement between the two provinces of Yen Bai and Val-de-Marne (France) in from 2014 -2019, from 15 -20 May, the delegation of Val-de- Marne and the Inter-Provincial Union of Waste Water and Sanitation in Paris (SIAAP) led by Sandrine Bénezet - Engineer, Department of Integrated Wastewater and Wastewater Treatment, The Val-de-Marne Provincial Council, head of the delegation worked with Yen Bai province on the project "Support to establish the master plan for collecting wastewater in Yen Bai city".