| Name | Address | City | ST | Postal | Phone | FAX | Email |
| CONDON-JOHNSON & ASSOCIATES, INC. | 480 ROLAND WAY, SUITE 200 | OAKLAND | CA | 94621 | (510)636-2100 | | scavazos@condon-johnson.com |
| GEOSTABILIZATION INTERNATIONAL, LLC | 10225 WESTMOOR DRIVE | WESTMINSTER | CO | 80021 | (855)579-0536 | | prequal@gsi.us |
| MALCOLM DRILLING COMPANY, INC. | 92 NATOMA STREET | SAN FRANCISCO | CA | 94105 | (415)901-4400 | | schambers@malcolmdrilling.com;ttanzillo@malcolmdrilling.com |