| Business | Phone |
| Terratech Engineers Inc 3900 Tarheel Dr # 106, Raleigh 27609 | (919) 876-9799 |
| D Miller & Assoc 8358 Six Forks Rd # 101, Raleigh 27615 | (919) 846-9202 |
| Danny Tai & Assoc 5561 Mcneely Dr # 101, Raleigh 27612 | (919) 782-9525 |
| Froehling & Robertson Inc 310 Hubert St, Raleigh 27603 | (919) 828-3441 |
| Geo Technologies Inc 3200 Wellington Ct # G, Raleigh 27615 | (919) 954-1514 |
| Mosher Engineering 557 Pylon Dr # D, Raleigh 27606 | (919) 856-1550 |