| Business | Phone |
| Hillis-Carnes Engineering 14155 Sullyfield Cir, Chantilly 20151 | (703) 817-1106 |
| Soil Tech Inc 14630 Flint Lee Rd F, Chantilly 20151 | (703) 631-9647 |
| Land Consultants Inc 14159 Mariah Ct 400, Chantilly 20151 | (703) 502-0738 |
| Patton Harris Rust & Assoc 14221a Willard Rd 500, Chantilly 20151 | (703) 263-0400 |