Current Steering Committee
Randy Billinger P.G.
Stacy G. Brocka, P.E.
Allender Butzke Engineers Inc.
3660 109th Street
Urbandale, IA 50322
Chris Clarke
Oklahoma Department of Transportation
Materials & Research Division
Geotechnical Branch
200 Northeast 21st Street
Oklahoma City, OK 73105
Elisabeth DeCoursey
SEDC Treasurer
President
Kansas City Testing & Engineering, LLC
1141 Southwest Blvd.
Kansas City, KS 66103
Ken Farrow
Missouri Department of Transportation Geotechnical Section
1617 Missouri Blvd.
Jefferson City, MO 65109
Kevin Griese
South Dakota Department of Transportation
Geotechnical Engineering Activity
700 East Broadway Avenue
Pierre, SD 57501
Rich Hahler
Coranco Great Plains Inc.
Box 23
Wahoo, NE 686066
Kyle Halverson, P.G.
SEDC Secretary
Professional Geologist II
Kansas Department of Transportation
Bureau of Structures and Geotechnical Services
Topeka, KS
Scott Jensen
South Dakota Geological Survey
Akeley Science Center
University of South Dakota
414 East Clark Street
Vermillion, SD 57069
Brad Jouppi
Central Mine Equipment
4215 Rider Trail North
Earth City, MO 63045-1106
Matt Marxsen
SEDC Executive Director
Field Service Coordinator
Conservation and Survey Division
(Nebraska Geological Survey)
School of Natural Resources
621 Hardin Hall
Lincoln, NE 68583-0996
Dave Mather
Terracon
15080 A Circle
Omaha, NE 68144
Jonathan Neace
Supervisor | Field Investigation Unit
Montana Department of Transportation
2701 Prospect Ave.
Helena, MT. 59620
Blake Nelson
1400 Gervais Avenue
Maplewood, MN 55109
Vincent (Butch) Reidenbach, Ph.D., P.E.
Geotechnical Engineering Consultant,
Agricultural Engineering Consultant,
Oil Field Services Consultant
15601 Claremont Blvd
Edmond, OK 73013
David Thomas
Soils & Geotechnical Program
Colorado Department of Transportation
4670 Holly Street, Unit A
Denver, CO 80216
Craig Walker
Wyoming Department of Transportation
5300 Bishop Blvd.
Cheyenne, WY 82009