Decision on common position (EC) No 12/1999 adopted by the Council with a view to adopting a Council Directive amending for the second time Directive 90/394/EEC on the protection of workers from the risks related to exposure to carcinogens at work and extending it to mutagens (13835/1/ 98 - C4-0002/99 98/0093(SYN))(Cooperation procedure: second reading)