A staff member walks in the hall of Lanzhou Veolia Water, in Lanzhou, capital of northwest China's Gansu Province, April 12, 2014. Crude oil leaked from a Lanzhou Petrochemical pipeline, poisoning the water source for Veolia Water plant, and bringing hazardous levels of benzene into the city's tap water, said an environment official during a conference call with the city government Saturday. (Xinhua/Chen Bin)