0000899243-03-000441 S-8 2 20030303 20030303 QUANTA SERVICES INC 0001050915 1731 742851603 DE 1231 S-8 33 333-103570 03590088 1360 POST OAK BLVD SUITE 2100 HOUSTON TX 77056 7133506000 1360 POST OAK BLVD SUITE 2100 HOUSTON TX 77056 S-8 1 ds8.htm QUANTA SERVICES, INC. 2001 STOCK INCENTIVE PLAN EX-5.1 3 dex51.htm OPINION