Cinnabar Companies' Clients

Advance Midstream, LP
Antero Resources Midstream Corporation
Aruba Petroleum, Inc.
AT&T
Atlantic-Richfield Company
Bagby Energy, LLC
BNSF Railway Company
Bucher Willis and Ratliff Engineers
Buckeye Pipe Line Company, LP
CenterPoint Energy Gas Transmission Company
CH2M Hill
Chaparral Energy, LLC
Chesapeake Energy Marketing, Inc.
Chesapeake Operating, Inc.
Chief Gathering, LLC
Citgo Petroleum Corporation
City of Bixby, Oklahoma
City of Broken Arrow, Oklahoma
City of Claremore, Oklahoma
City of Edmond, Oklahoma
City of Farmington, New Mexico
City of Fayetteville, Arkansas
City of Glenpool, Oklahoma
City of Jay, Oklahoma
City of Jenks, Oklahoma
City of Sand Springs, Oklahoma
City of Sapulpa, Oklahoma
City of Topeka, Kansas
City of Tulsa, Oklahoma
City of Yukon, Oklahoma
Clear Creek Energy Services, LLC
Clipper Windpower, Inc.
Coffeyville Resources Refining and Marketing, LLC
ConocoPhillips
Constellation Energy Group
Craig and Keithline Engineering
Cricket Communications
Crosstex Energy Services
D.W. Gates Engineering
DCP Midstream, LP
Devon Energy Corporation
Dewberry Design Group
Duke Energy Field Services
El Paso Field Services
Enbridge Midcoast Energy
Energy Transfer Company
Enron Engineering and Construction Co.
Enserca Engineering, LLC
Enterprise Products Operating, LP
Equilon Pipeline Company
Explorer Pipeline Company
Florida Gas Transmission Company
Frontier Energy Services, LLC
Gateway Energy Corporation
Genesis Pipe Line Company
Genova Power Company
Grand River Dam Authority
GTE Network Services
Gulftex Gathering, LP
HDR Engineering
HUB-Garver Engineers
Jones-Riverside Airport (Oklahoma)
KAMO Power
Kinder Morgan
Koch Industries
LDH Energy
Lead-Impacted Communities Relocation Trust (Oklahoma)
Level 3 Communications
Lucent Technologies, Inc.
Magellan Midstream Partners, LP
MetroCom, S.A.
Metropolitan Tulsa Transit Authority
Mid-America Pipeline Company
Midstream Energy Services, LLC
Midwestern Gas Transmission
Minnesota Pipe Line Company
New Mexico Department of Transportation
Norco Pipeline Company
Northern Border Pipeline Company
Northern Plains Natural Gas Company
NuStar Energy, LP (formerly Valero, LP)
OGE Energy Corporation
Oklahoma County, Oklahoma
Oklahoma Department of Transportation
Oklahoma Turnpike Authority
Osage County, Oklahoma
Pace Engineering
Panda Energy International
Panhandle Eastern Pipe Line Company
PB Network Services
Petrohawk Energy Corporation
Phillips Pipe Line Company
Plains All American Pipeline, LP
Poe and Associates Engineers
Progress Energy Service Company, LLC
Questar Exploration and Production Company
Quicksilver Resources, Inc.
RDT Properties, Inc.
Reliant Energy-Arkla
Rogers County Rural Water District #8 (Oklahoma)
SandRidge Energy, Inc.
Sapulpa Rural Water Company
Scissortail Energy, LLC
Sisemore, Hall & Weisz Surveyors
Souder Miller & Associates Engineers
STP Cherokee, Inc.
Sunoco Logistics Partners, LP
Targa Resources, LLC (formerly Dynegy Midstream)
Tetra Tech-FHC Engineers
Texas Energy Management
The Benham Group Engineers
The Coastal Corporation
The Ross Group Engineers
Transwestern Pipeline Company
Tri-State Generation and Transmission Association, Inc.
Tulsa Criminal Justice Authority
Tulsa County, Oklahoma
Tulsa International Airport
URS, Inc. Engineers
U.S. Corps of Engineers
U.S. Department of Housing and Urban Development
U.S. Environmental Protection Agency
U.S. Federal Aviation Administration
U.S. Federal Emergency Management Agency
U.S. Federal Highway Administration
Valero Terminaling and Distribution Company
Velocita Wireless (formerly PF.Net Communications)
Verdigris Valley Electric Cooperative
Wallace Engineering
Washington County Rural Water District #3 (Oklahoma)
West Shore Pipe Line Company
Willbros Engineering, Inc.
Williams Communications, Inc.
Williams Energy Group, Inc.
XTO Energy, Inc.