• 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: Ground Improvement (Vibro Stone Columns)
Subsurface was given the task of bringing weak clays and silts of strengths of 1,500 psf to a post-bearing pressure of 5,000 psf. Performance specifications called for less than one inch of settlement and less than one-half inch differential settlement.

Subsurface Constructors designed a system of 800 vibro stone columns installed with their stratacaster vibro rig. The 800 stone columns were installed in 20 days. Load testing of several production columns was performed in order to verify design column stiffness.

• Owner: Hazelwood School District
• General Contractor: SM Wilson
• Architect: TRI Architects
• Structural Engineer: KPFF
• Geotechnical Engineer: Midwest Engineering Services
• Concrete Contractor: Demien
• Equipment: Pennine Stratacaster