| Business | Phone |
| Advance Soil Technology 343 S Baywood Ave, San Jose 95128 | (408) 446-0809 |
| Alliance Geotech Consultants 131 Tully Rd, San Jose 95111 | (408) 279-4978 |
| American Soil Testing Inc 2734 S Bascom Ave, San Jose 95124 | (408) 559-6400 |
| Donald E Banta & Assoc 415 Meridian Ave, San Jose 95126 | (408) 287-7800 |
| Earth Tech Inc 695 River Oaks Pkwy, San Jose 95134 | (408) 232-2800 |
| Engeo Inc 6288 San Ignacio Ave # A, San Jose 95119 | (408) 574-4900 |
| Hallenbeck-Allwest Assoc Po Box 24487, San Jose 95154 | (408) 448-4975 |
| Krazan & Assoc 545 Parrott St, San Jose 95112 | (408) 271-2200 |
| Redwood Geotechnical Engineer 624 Seneca Ct, San Jose 95123 | (408) 227-5168 |
| John W Leonard Pe Po Box 18067, San Jose 95158 | (408) 629-9529 |
| Terrasearch Inc 6840 Via Del Oro # 110, San Jose 95119 | (408) 362-4920 |