• 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
This project consisted of renovating and expanding the existing Wheeler Activity Center with a 5,600 sq. ft. two story addition. The foundation design for the addition required all pad and continuous wall footings to be treated with aggregate piers to abearing capacity of 4,500 psf.

Subsurface Constructors designed the ground improvement layout, which consisted of installing vibro stone columns beneath all footings, including footings inside the existing structure. Subsurface constructed a total of 130 stone columns with the useof pre-drilling to accommodate the low (25-ft.) headroom and access conditions of the site. Subsurface installed the stone columns in less than two weeks with limited access ground improvement and drilling equipment.

Modulus tests were performed that yielded results exceeding design parameters. Access to the interior column locations was made possible by cutting a 12-ft. by 15-ft. entryway through the existing structure to allow equipment access and continuous material delivery.

• Owner: Peru State College
• General Contractor: Leuder Consgtruction Co.
• Geotechnical Engineer: Geotechnical Services, Inc.
• Structural Engineer: The Clark Enerson Partners
• Ground Improvement Design/Builder: Subsurface Constructors, Inc.