The Government should share with polluters the operating costs of waste treatment, the Liberal Party has proposed. By accepting its share, the administration would have more control of operating costs, the party said yesterday. Party chairman James Tien Pei-chun said it did not object to the 'polluter-pays' principle. 'However, the Government has to make sure expenditure on environmental capital works and the operation cost are closely monitored and cost-effective,' Mr Tien said. The party was responding to proposals raised by Tung Chee-hwa in his Policy Address to build waste incinerators and introduce waste-disposal fees. Details have not been finalised. Environmental groups have estimated that it would cost a four-member family $120 to $180 a month if the Government is to recover the entire cost of waste disposal. Mr Tien urged the administration to disclose to the public finance details of its environmental proposals. The Liberal Party said the Government should foot 30 per cent of the total operating costs of environmental projects as well as construction costs. Mr Tien also suggested that operation of environmental works be contracted out to the private sector to ensure they would be run efficiently. He also suggested that management of incinerators could be contracted out to private firms. To encourage the public to reduce waste, the party proposed that those who produced more pollutants should pay more. A spokesman for the Planning, Lands and Environment Bureau yesterday said it was still collecting views on the proposals and had no comment on specific suggestions made by the Liberal Party.