X0101 EFFECT 33 LIVE 2013-05-22 0001193125-13-177939 POS AM 0001449732 Willbros Group, Inc.\NEW\ 333-174406 0001521188 Bemis, LLC 333-174406-35 0001521257 Chapman Construction Co., L.P. 333-174406-34 0001521190 Chapman Holding Co., Inc. 333-174406-33 0001521192 Construction & Turnaround Services, L.L.C. 333-174406-32 0001521189 Chapman Construction Management Co., Inc. 333-174406-31 0001521193 Halpin Line Construction LLC 333-174406-30 0001521194 Hawkeye, LLC 333-174406-29 0001521195 Willbros Utility T&D Group Common Paymaster, LLC 333-174406-28 0001521196 Willbros Utility T&D Holdings, LLC 333-174406-27 0001521200 Lineal Industries, Inc. 333-174406-22 0001521209 Willbros Downstream, LLC 333-174406-21 0001521208 Willbros Downstream of Oklahoma, Inc. 333-174406-20 0001521201 Premier Utility Services, LLC 333-174406-19 0001521202 Skibeck Pipeline Company, Inc. 333-174406-18 0001521203 Skibeck PLC, Inc. 333-174406-17 0001521204 Trafford Corp 333-174406-16 0000821361 UTILX CORP 333-174406-15 0001521205 UtilX Overseas Holdings, Inc. 333-174406-14 0001521207 Willbros Construction California (U.S.), Inc. 333-174406-13 0001521206 Willbros Construction (U.S.), LLC 333-174406-12 0001521210 Willbros Energy Services Co 333-174406-11 0001521213 Willbros Engineers (U.S.), LLC 333-174406-10 0001521212 Willbros Engineering California (U.S.), Inc. 333-174406-09 0001521214 Willbros Government Services (U.S.), LLC 333-174406-08 0001521215 Willbros Midstream Services (U.S.), LLC 333-174406-07 0001521216 Willbros Project Services (U.S.), LLC 333-174406-06 0001521217 Willbros Refinery & Maintenance Services (U.S.), LLC 333-174406-05 0001521191 Premier West Coast Services, Inc. 333-174406-04 0001521219 Willbros United States Holdings, Inc. 333-174406-03 0001521220 Willbros Engineers, LLC 333-174406-02 0001521218 Willbros T&D Services, LLC 333-174406-01