0000899243-03-000050 S-8 2 20030110 20030110 QUANTA SERVICES INC 0001050915 1731 742851603 DE 1231 S-8 33 333-102448 03510588 1360 POST OAK BLVD SUITE 2100 HOUSTON TX 77056 7133506000 1360 POST OAK BLVD SUITE 2100 HOUSTON TX 77056 S-8 1 ds8.txt FORM S-8 EX-5.1 3 dex51.txt OPINION OF GARDERE WYNN SEWELL LLP