Clyde Hebbron

Sonde Geological Services Website: https://sondegeo.com/ Phone:  (530) 677-3055

David Sederquist

Youngdahl Consulting Group, Inc. Email: [email protected] Website: http://www.youngdahl.net/ Phone: 916-933-0633  

William T. Mitchell

Wheeldon Geology Email: [email protected] Phone: 530-621-4482