| Business | Phone |
| Active Drilling Inc Oakland 94611 | (510) 658-8228 |
| Favro Construction & Engineer Oakland 94601 | (510) 532-5568 |
| M & M Drilling & Shoring Inc 499 Embarcadero # A, Oakland 94606 | (510) 444-2034 |
| Access Soil Drilling Oakland 94612 | (510) 808-2200 |
| Owens Concrete Saw & Co 6323 San Pablo Ave, Oakland 94608 | (510) 428-1485 |
| Western Inc 2180 Manzanita Dr, Oakland 94611 | (510) 451-3993 |