0000950129-04-006937 424B3 1 20040909 20040909 QUANTA SERVICES INC 0001050915 1731 742851603 DE 1231 424B3 33 333-111738 041023248 1360 POST OAK BLVD SUITE 2100 HOUSTON TX 77056 7133506000 1360 POST OAK BLVD SUITE 2100 HOUSTON TX 77056 424B3 1 h18326e424b3.htm QUANTA SERVICES, INC. - REG. NO. 333-111738