A Harbin citizen filed a lawsuit against the subsidiary of the China National Petroleum Corp (CNPC), which is held accountable for polluting Songhua River, the city's major water source, here Thursday...Ding asked for a compensation of 15 yuan (less than two dollars) and a formal apology...Deputy general manager of CNPC, Zeng Yukang, has apologized openly for the polluting the Songhua River Thursday, but Ding insisted that an apology after the adjudication of the court is more than necessary.