| Business | Phone |
| Amec 10239 Technology Dr, Knoxville 37932 | (865) 671-6774 |
| Tri-State Engineering Svc 7300 Homestead Dr, Knoxville 37918 | (865) 922-2473 |
| Test America Drilling Co 8321 Oak Ridge Hwy, Knoxville 37931 | (423) 392-2942 |
| Shaw E & I 312 Directors Dr, Knoxville 37923 | (865) 690-3211 |
| Business Environment Inc 1125 Winding Way Dr, Knoxville 37923 | (865) 691-9825 |
| Strata Environmental 110 Perimeter Park Rd # E, Knoxville 37922 | (865) 539-2077 |
| Environmental Engineering Grp 11020 Solway School Rd # 109, Knoxville 37931 | (865) 690-4038 |
| Focus Environmental Inc 9050 Executive Park Dr # A, Knoxville 37923 | (865) 694-7517 |