Over the past several decades, Calvin has provided services in a variety of industry sectors. This is a partial list of the various clients for whom he has conducted projects:
Cement & lime manufacturing
- Ash Grove Cement – Durkee, OR
- Ash Grove Cement (formerly Holcim Cement – Montana City, MT
- Lafarge Cement – Richmond, BC
- Mitsubishi Cement Corporation – Lucerne Valley, CA
- Greymont Lime – Exshaw, AB | Townsend, MT + several others
- Wyoming Lime – Frannie, WY
Mining
- Columbia Falls Aluminum – Columbia Falls, MT
- Asarco lead smelter- East Helena, MT
- Kennecott Utah Copper LLC, a division of Rio Tinto Group, – Salt Lake City, UT
- Teck Coal – Sparwood, BC
Power generation
- BC Hydro – VAncouver, BC
- Corix power facility – Vancouver, BC
- Island Generation – Campbell River, BC
- Rosebud Energy – Rosebud, MT
- Suncor – Fort MacMurray, AB
Other
- AvCorp Aerospace Industries – Vancouver, BC
- AZ Foam – Burnaby, BC
- Broadway Boilers – Vancouver, BC
- ChemTrade – Vancouver, BC
- Concerned Citizens Group – Mission, BC
- Grandview Blacktop, Ltd. – Abbotsford, BC
- Malstrom Air Force Base – Great Falls, MT
- Metro Vancouver, BC
- Muter Law – Lower Mainland, BC
- Northwest Offset Printing – Spokane, WA
- Pembina Shipping and Handling Portside – Vancouver, BC
- RAM Environmental Rapid Response – Kelowna, BC
- Renewable Energy Corporation (REC) Silicon – Butte, MT and Moses Lake, WA
- Rock Wool – Grand Forks, BC
- SGL Composites, LLC – Moses Lake, WA
Oil and gas
- BP Refineries – Cherry Point, WA
- Burnaby Refinery (Parkland) – Burnaby, BC
- Enterprise Products – Houston, TX
- ExxonMobil Oil Refinery – Billings, MT
- Montana Refining – Butte, MT
- Montana Chemical & Sulphur – Billings, MT
- Wyoming Refining – Newcastle, WY
- Gas flares – Eastern Montana, North Dakota
Food processing
- Cargill food processing – Camrose, AB
- Malt processing for Budweiser – Great Falls, MT
- Potato processing plant – Potlatch, Idaho
- Sunco Foods – Burnaby, BC
- Western Sugar Cooperative – Billings, MT
Wood products (pulp & paper)
- Coastland Wood Products – Nanaimo, BC
- Harmac Lumber – Nanaimo, BC
- Kruger Products – New Westminster, BC
- Louisiana Pacific Wood Products – Montana
- Mercer Celgar – Castlegar, BC
- NORPAC Paper Products – Longview, WA
- Plum Creek Wood Products – Columbia Falls, MT
- Roseburg Forest Products – Roseburg, OR
- Simpson Lumber Kraft Pulp Mill – Tacoma, WA
- Stimson Lumber – Missoula, MT
- Tolko Industries – Armstrong, BC