| Business | Phone |
| A N West Inc 3095 Richmond Pkwy # 201, Richmond 94806 | (510) 222-9800 |
| Kister-Savio & Rei Inc 3095 Richmond Pkwy # 214, Richmond 94806 | (510) 222-4020 |
| Questa Engineering Corp 1220 Brickyard Cove Rd # 206, Richmond 94801 | (510) 236-6114 |
| Kenneth S Chainey Pe 6329 Bonita Ct, Richmond 94806 | (510) 234-0503 |