| Business | Phone |
| Beta Engineering Inc 39 Main St # 1, Jackson 95642 | (209) 223-4126 |
| Morlan Civil Engineering 504 Broadway, Jackson 95642 | (209) 223-1441 |
| Alaska Engineering 114 Main St, Jackson 95642 | (209) 223-2350 |
| Vail Consulting Svc 12380 Airport Rd, Jackson 95642 | (209) 223-1087 |