| Business | Phone |
| Hillside Drilling Inc 539 S 11th St, Richmond 94804 | (510) 234-6532 |
| Ofiaro Bldg & Engineering 217 S 1st St, Richmond 94804 | (510) 233-4292 |
| Precision Sampling 1081 Essex Ave, Richmond 94801 | (510) 237-4575 |
| Joe's Drilling 1111 7th St, Richmond 94801 | (510) 233-1093 |
| Rowland Drilling & Excavation 620 S 31st St, Richmond 94804 | (510) 232-3195 |