• Ground Improvement
• Illinois DOT
• Hazelwood Schools
• Wentzville
• West Memphis
• St. Peters Rec Plex
• Sheboygan Police Station
• Lange-Stegman
• Kennett
• Bluffton Ethanol
• Wheeler Center
• Earth Retention
• Metrolink
• Warrenton Copper
• MoDot
• Centrum Properties
• Pinnacle Tunnel
• Metropolitan Sewer
• Drilled Shafts
• Pinnacle Casino
• Eads Bridge
• Driven Pile
• MCI WorldCom
• Ameren UE
• Augercast
• Proctor & Gamble
• Micropile
• St. Louis Zoo
• Cupples Station

Service: Vibro Stone Columns
Subsurface Constructors had the tasks of designing and installing a ground improvement system that would yield allowable bearing capacities ranging from 3,500 psf to 5,000 psf. The areas that required treatment were several different types of process and storage tanks with foundations types ranging from ringwall footings to large mats.

Vibro stone columns were installed beneath the rings and slabs of the tanks to support the loads and minimize total and differential settlement of the tank foundations. The mat foundations were supported on a rectangular grid spacing of stone columns. The spacing was decreased in the more heavily loaded areas of the mat.

Although some pre-drilling was necessary on the project, Subsurface was able to penetrate through the stiff upper layer of soil in several areas, thus minimizing the need for pre-drilling and spoil removal. In all, 1250 vibro stone columns were installed in eleven days of shifted work.

• Owner: Indiana Bio Energy, Inc.
• Geotechnical Engineer: Olsson Associates
• Structural Engineer: Fagan Engineering
• General Contractor: Jackson Briner JV, LLC
• Ground Improvement/Designer Builder: Subsurface Constructors, Inc.