| Castle Minerals | 707-374-6814 | 45 Main St | Rio Vista | CA | 94571 |
| Chevron U S A Inc | 707-444-7850 | 3400 Christie St | Eureka | CA | 95503 |
| Graham Jim Inc | 707-374-6200 | 1015 Airport Rd # C | Rio Vista | CA | 94571 |
| Graham Paul J Drilling & Service Co Shop | 707-374-6712 | 680 River Rd | Rio Vista | CA | 94571 |
| Obies Drill Pipe Service | 707-987-2001 | 18675 Highway 29 | Middletown | CA | 95461 |
| Pacific Pineline Survey | 707-446-0427 | 70 Union Way | Vacaville | CA | 95687 |
| Select Wireline Services Inc | 707-374-5691 | 2360-G Airport Rd | Rio Vista | CA | 94571 |
| Select Wireline Services Inc Fax Line | 707-374-5489 | 2360-G Airport Rd | Rio Vista | CA | 94571 |
| Subtech Consultants | 707-829-9077 | 335 Sparkes Rd | Sebastopol | CA | 95472 |
