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  • AECOM
  • All American Pipeline Company
  • Wood.
  • UPI
  • American Air Liquide Inc.
  • Anadarko Petroleum Corporation
  • Axis Midstream Holdings LLC
  • Black Lake Pipe Line Company
  • Bridgetex Pipeline Co
  • Buckeye Gulf Coast Pipe Lines
  • Cavern Solutions Inc.
  • CenterPoint Energy Houston Electric
  • CH2M
  • Cheniere Nat'l Gas Liquids LLC
  • Chevron Pipe Line Company
  • Contract Land Staff LLC
  • Denbury Onshore LLC
  • Diamond Shamrock
  • Diamond-Koch
  • Dow Chemical Company
  • Driver Pipeline Company
  • EnCana Oil & Gas (USA) Inc.
  • Energy Specialists Consulting LLC
  • Energy Transfer Company
  • EnsiteUSA
  • Enterprise NGL Pipelines LLC
  • Enterprise Products Operating Company LP
  • EPCO Holdings Inc.
  • Equilon Enterprises LLC
  • Equistar Chemicals LP
  • ETC Tiger Pipeline Company
  • Explorer Pipeline Company
  • Fairway Energy Partners LLC
  • Farnsworth Group
  • Florida Gas Transmission Company
  • Fluor Daniel Inc.
  • Greene's Energy Group LLC
  • Groundwater & Environmental Services Inc.
  • Hanson Professional Services Inc.
  • Harvest Pipeline Company
  • Houston Fuel Oil Terminal Company
  • Houston Pipe Line Company LP
  • INEOS Styrolution America LLC
  • Intercontinental Terminals Company LLC
  • Jacobs Engineering
  • John Griffin Surveyors
  • Kaneka North America LLC
  • KEGroup Inc.
  • Keyera Energy
  • Keystone Engineering Inc.
  • Kinder Morgan
  • Kleinfelder
  • Langan Engineering & Environmental Services Inc.
  • Liberty Pipeline Group
  • Lloyd Engineering Inc.
  • Lubrizol Corporation, The
  • LyondellBassell
  • Magellan Pipeline Company LLC
  • Marathon Pipe Line LLC
  • Mitchell Energy Corporation
  • MODA Midstream LLC
  • Natural Gas Pipeline Company of America LLC
  • Navitas Midstream Partners LLC
  • Next Wave Energy Partners, LP
  • Occidental Chemical Company
  • ONEOK
  • Paragon Engineering Services Inc.
  • PetroLogistics Olefins LLC
  • Primoris Energy Services Corporation
  • Project Consulting Services Inc. (known as PCS)
  • Regency Gas (purchased Eagle Rock)
  • Rover Pipeline LLC
  • S&B Engineers and Constructors Ltd
  • Sabine Pipe Line Company
  • Sanchez Oil & Gas Corporation
  • SAW Construction Corporation
  • Sealevel Construction Inc.
  • Seaway Products Pipeline Company
  • SemGroup Corporation
  • South Texas Pipeline Company
  • Square Mile Energy LLC
  • Summit Industrial Construction LLC
  • SWCA Incorporated
  • Tarsco Construction Corporation
  • Tellepsen
  • Tetra Tech, Inc.
  • Texas Brine
  • Texon LP
  • TexStar Midstream Logistics Pipeline LP
  • Transwestern Pipeline Company LLC
  • URS Corporation
  • Valero Partners Houston LLC
  • Valero Refining Company
  • Vintage Petroleum Inc.
  • Vopak Moda Houston LLC
  • WCM Group
  • Wildcat Midstream Operating
  • Willbros
  • Williams
  • Zachry Industrial Inc.