| Business | Phone |
| Amec Earth & Environmental 5007 Pacific Hwy E 5, Tacoma 98424 | (253) 896-0132 |
| Systems Engineering Inc 625 Commerce St, Tacoma 98402 | (253) 572-4132 |
| Cross Engineers Inc Elec 2407 N 31st St, Tacoma 98407 | (253) 759-0118 |
| Impact Engineering Inc 6716 E Side Dr Ne, Tacoma 98422 | (253) 942-3731 |