| Business | Phone |
| Castech Consulting Engineers 4458 Spencer St, Torrance 90503 | (310) 214-3994 |
| Cetech Engineering 1821 W 213th St, Torrance 90501 | (310) 533-1550 |
| Dca Civil Engineering Group 17625 Crenshaw Blvd, Torrance 90504 | (310) 327-0018 |
| Denn Engineers 3914 Del Amo Blvd # 921, Torrance 90503 | (310) 542-9433 |
| Lanco Civil Engineers 1010 Crenshaw Blvd # 200, Torrance 90501 | (310) 533-4955 |
| T W Cooper Inc Po Box 4253, Torrance 90510 | (310) 328-1180 |
| Aart Assink Assoc 1611 El Prado Ave, Torrance 90501 | (310) 618-0782 |
| Surveytech Group Inc 22344 Hawthorne Blvd # G, Torrance 90505 | (310) 791-0577 |
| R T Quinn & Assoc 1907 Border Ave, Torrance 90501 | (310) 320-4125 |