| Business | Phone |
| Denali Inc 2255 Morello Ave # 170, Pleasant Hill 94523 | (925) 602-2333 |
| Gas System Engineering 3341 Vincent Rd, Pleasant Hill 94523 | (925) 944-4757 |
| Jwa Consulting Engineers Inc 3480 Buskirk Ave # 300, Pleasant Hill 94523 | (925) 939-5000 |
| Meca Consulting Inc 620 Contra Costa Blvd, Pleasant Hill 94523 | (619) 229-6661 |
| G C Slagis Assoc 258 Hillcrest Pl, Pleasant Hill 94523 | (925) 687-8941 |
| Nor Cal Engineering Consultant 20 Dudley Ct, Pleasant Hill 94523 | (925) 348-4272 |
| Pretech Inc 2255 Morello Ave # 200, Pleasant Hill 94523 | (925) 687-9599 |
| Urs Corp 3440 Vincent Rd # C, Pleasant Hill 94523 | (925) 974-1550 |