0000950129-04-007195 8-K 1 20040920 8.01 20040921 20040920 QUANTA SERVICES INC 0001050915 1731 742851603 DE 1231 8-K 34 001-13831 041038284 1360 POST OAK BLVD SUITE 2100 HOUSTON TX 77056 7133506000 1360 POST OAK BLVD SUITE 2100 HOUSTON TX 77056 8-K 1 h18553e8vk.htm QUANTA SERVICES, INC. - DATED 9/20/2004