0000950129-03-004894 10-Q/A 5 20030630 20031002 QUANTA SERVICES INC 0001050915 1731 742851603 DE 1231 10-Q/A 34 001-13831 03925173 1360 POST OAK BLVD SUITE 2100 HOUSTON TX 77056 7133506000 1360 POST OAK BLVD SUITE 2100 HOUSTON TX 77056 10-Q/A 1 h09257e10vqza.htm QUANTA SERVICES, INC. - DATED 6/30/2003 EX-31.1 3 h09257exv31w1.txt CERTIFICATION OF CEO PURSUANT TO SECTION 302 EX-31.2 4 h09257exv31w2.txt CERTIFICATION OF CFO PURSUANT TO SECTION 302 EX-32.1 5 h09257exv32w1.txt CERTIFICATION OF CEO PURSUANT TO SECTION 906 EX-32.2 6 h09257exv32w2.txt CERTIFICATION OF CFO PURSUANT TO SECTION 906