| Business | Phone |
| Westlake Consultants 15115 Sw Sequoia Pkwy # 150, Tigard 97224 | (503) 684-0652 |
| Thomas/Wright Inc 7190 Sw Fir Loop, Tigard 97223 | (503) 624-1468 |
| Nicoli Engineering 9025 Sw Center St, Tigard 97223 | (503) 620-2086 |
| Harris-Mc Monagle Assoc Inc 12555 Sw Hall Blvd, Tigard 97223 | (503) 639-3453 |