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Wine Caves, Tunnels, and Alternative Underground Structures

Wine Cave

Condor is a leader in the geotechnical/geological evaluation, design, and engineering of small to medium-sized tunnel projects, including over 200 tunnel projects in the Napa, Sonoma, Lake, Mendocino, Central Coast, and Sierra-Central Valley regions of California, as well as other areas.

Condor is a diversified, multidisciplinary organization with the capability to provide a variety of earth and environmental science, engineering, surveying, mapping, GIS, and construction management and monitoring services, to private and public sector clients. Condor's staff has over 20 years of experience in geologic investigations, design, engineering, construction, and repair of tunnels. This experience includes tunnel feasibility studies, evaluating geotechnical foundation, slope, and tunneling conditions, tunnel liner and portal design, tunnel rehabilitation, materials testing, and construction monitoring.

Click the play button on the video above.

Support — Project Manager

Scott Lewis has over 25 years of experience in geologic investigations, construction, and repairs of tunnels, structural foundations, landslides, slope stability, dam sites, and other geologic hazards. Mr. Lewis specializes in wine cave feasibility studies, design, construction management, and field engineering. Mr. Lewis has been involved in more than 225 tunnel, wine cave, and underground structure projects throughout his career. He joined Condor in 1989 and is currently its Principal Engineering Geologist.

Representative Project Experience


  • Project Feasibility Studies
  • Design Services
  • Tunnels and Portals
  • Construction Management
  • Serving as the owner's technical representative
  • Technical review of contractor's methods
  • Field Engineering
  • Design optimization based on field conditions
  • Field observations of geologic conditions to determine the applicability of the design
  • Quality Assurance
  • Field inspection of tunneling and construction
  • Stability monitoring during and after construction
  • Materials Testing
  • Specialty Consultants
  • Failure Analysis and Repair Design
  • Rehabilitation

Project Notes

Condor was selected by OID to do Engineering/Design, Construction Management, and Construction Inspection and Testing for their Main Canals and Tunnels Rehabilitation Project.

A 2004 write-up in Tunnel Business Magazine about northern California's estimated 130-150 wine caves.


Scott Lewis, CEG
Principal Tunnel Specialist
(800) 800-0490
(209) 532-0361
Click to email

Excellent job!

— Merced County Department of Public Works


(800) 800-0490
(209) 532-0361
21663 Brian Ln.
Sonora, CA 95370

(209) 234-0518
188 Frank West Cr. Suite I
Stockton, CA 95206

Rancho Cordova
(916) 783-2060
2941 Sunrise Blvd, Suite 150
Rancho Cordova, CA 95742

(209) 388-9601
1739 Ashby Road, Suite B
Merced, CA 95348

(209) 984-4593
17857 High School Rd.
Jamestown, CA 95327