| Business | Phone |
| Greenpipe Industries Ltd 605 5 Ave Sw #800, Calgary T2P 3H5 | (403) 260-6702 |
| Gulf Interstate Engineering 205 5 Ave Sw #3500, Calgary T2P 2V7 | (403) 265-9700 |
| Joyran Enterprises Ltd 948 Rideau Rd Sw, Calgary T2S 0R6 | (403) 243-7551 |
| Singleton Associated Engr Ltd 1740 10 St Sw, Calgary T2T 3E8 | (403) 245-3800 |
| Starco Engineering Ltd 250 6 Ave Sw #1200, Calgary T2P 3H7 | (403) 249-0430 |
| Symborski & Assoc Ltd 44 Bralorne Cres Sw, Calgary T2W 0Y8 | (403) 255-3718 |
| Cimarron Engineering Ltd 6025 11 St Se #300, Calgary T2H 2Z2 | (403) 252-3436 |
| Corrocean Canada Inc 715 5 Ave Sw #300, Calgary T2P 2X6 | (403) 286-0606 |