• 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
• Hwy 40 Retrofit
• Pinnacle Casino
• Eads Bridge
• Driven Pile
• MCI WorldCom
• Ameren UE
• Augercast
• Proctor & Gamble
• Micropile
• Lenzburg Bridge
• St. Louis Zoo
• Cupples Station

Service: Ground Improvement
This project involved the expansion of a Stabilized Nitrogen Technology Production Center for Lange-StegmanCorporation. Soils at the site consisted of uncontrolled fills on top of river sands and silts. Initially the project called for approximately 1,000 driven H-pile, which was priced at approximately $5 million.

These foundation costs were detrimental to the project budget, causing the owner to consider reducing the size of the project. Subsurface Constructors analyzed the soil and determined that a ground improvement program consisting of vibrostone column could support the loads of the new production center. Subsurface was able to perform this work for roughly $600,000 not only saving the owner $4.4 million, but allowing them to build the larger facility as well as save time on the project schedule.

This project won Subsurface Constructors a 2007 Keystone Construction Excellence Award for Specialty Contractor project under $2 million.

• Owner: Lange-Stegman
• General Contractor: Lange-Stegman
• Geotechnical Engineer: Shively Geotechnical
• Ground Improvement Design/Builder: Subsurface Constructors, Inc.