Alpha Leak Detection & Pipeline Services - Kemah, TX
Alliance Engineering - Denver, CO; Houston, TX
Allied Corrosion - Marietta, GA; Houston, TX
AMEC Paragon Engineering - Houston, TX
Aspen Corrosion, Inc. - Houston, TX
Atlas Engineering - Houston, TX; New Orleans, LA; Aberdeen, Scotland
Audubon Engineering Company L.L.C. - Houston, TX; Covington, LA
Babcock Eagleton, Inc. - Houston, TX
Baker Hughes - Houston, TX; Calgary, Canada; Edmonton, Canada
Bartlett & West -Bismarck, ND; Topeka, KS
Bechtel - Houston, TX; Frederick, MD
BL Companies - Pittsburgh, PA
Boardwalk Pipeline Partners LP - Houston, TX; Owensboro, KY
Bowman Consulting - Chantilly, VA
BP - Houston, TX; Calgary, AB Canada
C.H. Fenstermaker & Associates, Inc. - Lafayette, LA; New Orleans, LA; Nashville, TN; Houston, TX
Cadd Data, Inc. - Guaynabo, P.R.
CASMS Trident- Baytown, TX
CEM Resources, Inc. - Houston, TX; Fellsmere, FL
CenterPoint Energy - Shreveport, LA; Houston, TX
CH2MHILL - Houston, TX; Denver, CO; Bellevue, WA; Corvallis, OR; Santa Anna, CA;
Chenault Consulting, Inc. -Farmington, NM;
Cheniere Energy -Houston, TX
Chesapeake Energy - Fort Worth, TX; Horseheads, NY; Oklahoma City, OK; San Antonio, TX;
Chester Engineers - Moon Township, PA
Chevron - Houston, TX
Chippewa Resources - Minot, ND
CIMARRON Engineering, Ltd. - Calgary, AB, Canada
Coler & Colantonio, Inc. - Dayton, OH; Holyoke, MA; Houston, TX; Norwell, MA; Portland, ME
Cornerstone Engineering Services - Scarborough, ME
CorrPro - Houston, TX
Crowley Pipeline & Land Surveying, L.L.C. - Jacksboro, TX
DCP Midstream - Houston, TX
Denbury Resources, Inc. - Plano, TX
Devon Energy - Houston, TX; Oklahoma City, OK
Downtown Design Services Inc. - Denver, CO; Tulsa, OK
Doyle & Wachtstetter, Inc. - Clute, TX
The EADS Group - Somerset, PA
EDM Services - Simi Valley, CA
El Paso Corporation - Birmingham, AL; Colorado Springs, CO; Houston, TX
EMC, Inc. - Grenada, MS
EMS Global, Inc. - Houston, TX
EN Engineering - Woodridge, IL
Enbridge - Houston, TX; Superior, WI; Edmonton, Alberta, Canada
Encompass - Houston, TX
Energy Management & Services Company - Houston, TX; Versailles, KY
Energy Transfer - Houston, TX
Engineering Service - Jackson, MS
Enterprise - Houston, TX
ENGlobal - Houston, TX; Tulsa, OK
EQT Corporation - Pittsburgh, PA
Equinox Engineering Ltd. - Calgary, AB
Equistar Chemicals - Houston, TX
Excel Midstream - Houston, TX
Fluor - Houston, TX; Camberley, UK; Trinidad
Frontier Surveying Company - Fort Worth, TX
G2 Partners, LLC - Houston, TX
GAI Consultants - Homestead, PA
Ganem & Kelly Surveying, Inc. - Point Comfort, TX
Gateway Services Group - Fort Worth, TX
Geophysical Data Management, Inc. - Dallas, TX
Golden Field Service - Tulsa OK
Golder Associates - Calgary, AB, Canada
Gulf Interstate Engineering - Houston, TX
Gullett & Associates, Inc. - Houston, TX
Hanson Survey - Houston, TX
Hatch Mott MacDonald - Hadley, MA; Houston, TX; Milburn, NJ
Herbert, Rowland, & Grubic, Inc. - Cranberry Township, PA
Holland Engineering - Holland, MI
Howland Engineering & Surveying Co. - Laredo, TX
Hunt, Guillot & Associates Pipeline Services, LLC - Ruston, LA
Ingenieria Dennis - Mexicali B.C., Mexico
Integrated Pipeline Services, Inc. - Canonsburg, PA; Tulsa, OK
Jacobs Engineering Group, Inc. - San Antonio, Austin, & Fort Worth, TX
Joe Hunt & Associates, LLC - New Milford, PA
John Chance Land Surveys, Inc. - Lafayette, LA
Kadrmas, Lee & Jackson, Inc. - Bismarck, ND
KBR - Houston, TX; Brisbane, Australia
Kestrel Engineering, Inc. - Houston, TX
Kinder Morgan - Houston, TX; Lakewood, CO; Orange, CA;
Kleinfelder - San Diego, CA
L&S Surveying - San Fernando, Trinidad
Lamb-Star Engineering - Plano, TX
Landmark Survey and Mapping - Washington, PA
Larson Design Group - Williamsport, PA
Link Field Services - Mineral Wells, TX
LJA Engineering, Inc. - Beaumont, TX
LIS Technology - Fort Worth, TX
LT Mapping Services, Inc. - Tulsa, OK
LW Survey - Denver, CO; Duluth, MN; Tulsa, OK
LyondellBasell Industries - Houston, TX
M&H Energy Services - Lafayette, LA; Houston, TX
Maverick Engineering - Houston, TX
Meridian Surveys - Saskachewan, LA
Messinger & Associates - Bastrop, LA
Michael Baker Jr., Inc. - Houston, TX
MidAmerican Energy / Northern Natural Gas - Omaha, NE
MidCo Services, Inc. - Sand Springs, OK
Morris P. Herbert, Inc. - Baton Rouge, LA; Houma, LA; Houston, TX
Mustang Engineering, Inc. - Houston, TX
Northern Natural Gas - Omaha, NE
National Pipeline Services, LLC - Pleasant, MI
NuStar Energy - San Antonio, TX
Oxy - Houston, TX; Midland, TX
Project Consulting Services - Houston, TX; Metaire, LA
Pegasus International - Houston TX
PetroFac - London SW1Y 6HH, UK
PetroIT - Houston, TX; New Delhi, India
Petroleum Field Services - Denver, CO
Pipeline Land Services - Wichita Falls, TX; San Antonio, TX
Plantation Pipeline Company - Atlanta, GA;
Point Engineering - Port Harcourt Rivers State, Nigeria
PPI Technology Services- Houston TX
Project Consulting Services - Houston, TX; Metairie, LA
QPS Engineering - Tulsa, OK
R Squared - Monroe, LA
Raba Kistner Infrastructure, Inc. - Dallas, TX
RSH Engineering - Houston, TX
S&B - Houston, TX
SAM, Inc. - Austin, TX
SGC Engineering - Westbrook, ME
Shafer, Kline, & Warren, Inc. - Kansas City, MO; The Woodlands, TX; Tulsa, OK
SNC Lavalin - Calgary, Canada
Southern Design Cadworks - Houston, TX
Spartan Engineering - Tulsa, OK
Spec Services - Orange County, CA
Stantec - Buckhannon, WV
Structural Integrity - Centennial, CO
Stewart Weir - Sherwood Park, Alberta
STV, Inc. - Douglassville, PA
Superior Appalachian Pipeline - Canonsburg, PA
T. Baker Smith, Inc. - Houston, TX; Houma, LA
Topographic - Pampa, Tx
TransCanada Pipelines - Houston, TX; Calgary, Canada
TRC Solutions - Orange County, CA
Trico Survey & Mapping - Bloomington, IN
TROW Engineering - Tallahassee, Fl
Uintah - Vernal, UT
Universal Ensco Inc. - Houston, TX; Tulsa, OK;
Upside Engineering - Calgary, AB, Canada
URS Corporation - Denver, CO; Lakewood, CO; Houston, TX; Pittsburgh, PA
Vanasse Hangen Brustlin, Inc. - Watertown, MA
Wayne Acree, P.L.S., Inc. - West Monroe, LA
Westwood - Eden Pairie, MN
Willbros Engineers, Inc - Tulsa, OK
William H. Smith & Associates - Grand Junction, Colorado
Williams Gas Pipeline - Houston, TX; Tulsa, OK
Williams Midstream - Tulsa, OK
WorleyParsons - Calgary, AB; Houston, TX
Zero Degrees Surveying & Mapping Services - Fort Worth, TX