| Business | Phone |
| Hilton Engineering Inc 4500 Campus Dr, Newport Beach 92660 | (949) 553-0776 |
| Questar Engineering Inc 20062 Sw Birch St, Newport Beach 92660 | (949) 250-7277 |
| Mitsubishi Power System 100 Bayview Cir # 4000, Newport Beach 92660 | (949) 856-8400 |
| Method 502 503 Avenida Lucia, Newport Beach 92660 | (949) 378-2581 |
| Advanced Professional Engineering Consultants, Inc. 3901 Westerly Place, Suite 107, Newport Beach 92660 | (949) 756-0409 |