| Business | Phone |
| Earth Max Consultants 1412 Henry St, Berkeley 94709 | (510) 528-3168 |
| Jensen Van Lienden Assoc 1840 Alcatraz Ave # C, Berkeley 94703 | (510) 658-9111 |
| Stimac Associates Po Box 7108, Berkeley 94707 | (510) 527-9301 |
| Terra Engineers Inc 2140 Shattuck Ave, Berkeley 94704 | (510) 841-8500 |