OPINION OF THE ECONOMIC AND SOCIAL COMMITTEE ON A PROPOSAL FOR A COUNCIL DIRECTIVE ON THE APPROXIMATION OF THE LAWS OF THE MEMBER STATES CONCERNING THE LEAD AND BENZENE CONTENT IN PETROL AND A COMMUNICATION OF THE COMMISSION TO THE COUNCIL REGARDING THE COMPLETION OF THE PROPOSAL FOR COUNCIL DIRECTIVE COM(84) 226 FINAL OF 6 JUNE 1984 AMENDING DIRECTIVE 78/611/EEC ON THE APPROXIMATION OF THE LAWS OF THE MEMBER STATES CONCERNING THE LEAD CONTENT OF PETROL