| Business | Phone |
| John H Dailey Santa Rosa 95404 | (707) 569-0102 |
| Giblin Associates 134 Lystra Ct # B, Santa Rosa 95403 | (707) 528-3078 |
| Michelucci & Assoc 2455 Bennett Valley Rd, Santa Rosa 95404 | (707) 527-7434 |
| Rgh Geotechnical Consultants 1305 N Dutton Ave, Santa Rosa 95401 | (707) 252-8105 |
| Young Engineering Svc 132 Boas Dr, Santa Rosa 95409 | (707) 538-7503 |