Clients
| Big West Oil | North Salt Lake Refinery, Utah |
| BP | Blaine Cherry Point Refinery, Washington |
| CH2M Hill | Bellingham, Washington |
| Chevron | Evanston, Wyoming |
| CHS | Laurel, Montana |
| Dyno Nobel Inc. | Deer Island, Oregon |
| Englobal Engineering | Beaumont, Texas |
| ExxonMobil | Billings, Montana |
| Greenberry | Corvallis, Oregon Ferndale, Washington |
| Lavender Construction | Aliceville Corporate Office, Alabama Hunt Refinery, Alabama |
| Mills Electric | Bellingham, Washington |
| Mustang Engineering | Houston, Texas |
| NCRA | McPherson Refinery, Kansas |
| PM Northwest | Mount Vernon, Washington |
| Phillips66 | Bartlesville Corporate Office, Oklahoma Bayway Refinery, New Jersey Billings Refinery, Montana Borger Refinery, Texas Ferndale Refinery, Ferndale, Washington Humber Refinery, North Lincolnshire, United Kingdom Los Angeles Refinery, California Santa Maria Refinery, California |
| Shell | Anacortes Refinery, Washington Deer Park Refinery, Texas Shell Upstream, Alaska |
| Solar Grade Silicon | Moses Lake, Washington |
| Starcon International | San Nicolas, Aruba |
| Sunoco, Inc. | Philadelphia, Pennsylvania |
| Tesoro | Anacortes Refinery, Washington Carson Refinery, California Kapolei Refinery, Hawaii Kenai Refinery, Alaska Los Angeles Refinery, California Mandan Refinery, North Dakota Martinez Refinery, California San Antonio Corporate Office, Texas Salt Lake City Refinery, Utah |
| Transfield Services | Carson Corporate Office, California Chevron Evanston Refinery, Wyoming |
| U.S. Oil & Refining Co. | Tacoma Refinery, Washington |
| Valero | San Nicolas, Aruba Wilmington, California |
| Veca Electric | Bellingham, Washington |
| Western Refinery Services | Ferndale, Washington |