0000950129-04-004571 8-K 2 20040701 5 7 20040701 WASTE MANAGEMENT INC 0000823768 4953 731309529 DE 1231 8-K 34 001-12154 04893397 1001 FANNIN STREET STE 4000 HOUSTON TX 77002 7135126200 1001 FANNIN STREET SUITE 4000 HOUSTON TX 77002 USA WASTE SERVICES INC 19920703 8-K 1 h16546e8vk.htm WASTE MANAGEMENT, INC. - JULY 1, 2004 EX-5.1 2 h16546exv5w1.htm OPINION OF JOHN S. TSAI