• 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: Earth Retention System
The River Des Peres channel runs throughout the St. Louis area. The channel contains multiple sewer lines. In the summer of 1995, a 400 ft section slid to the bottom of the channel. The slide caused the sewers to be pushed out of the ground and destroyed, complicating the problem. This part of the channel was next to a busy intersection which also contained multiple gas lines under the street. Subsurface Constructors was called to fix the slide. The company was quickly able to mobilize a Manitowac 2900 the next day.

The site geology consisted of 30-40 ft of fill, 20 ft of silt, and 60 ft of dolimite limestone. Metropolitan Sewer District wanted a permanent shoring system to prevent any more sliding to occur. It was concluded that a sheet pile wall with tiebacks would solve the problem. The slide area was taken out and a shot rock fill was placed after the sewers were reconstructed. Subsurface installed P2-27 sheet pile 40 ft long for the wall length, they then installed 45 double corrision tiebacks 70 ft long into 10 ft of limestone.

• Owner: Metropolitan Sewer District
• Utilitiy Contractor: Bates Utility
• Shoring Contractor: Subsurface Constructors
• Soil Engineer: Geotechnology
• Equipment: Manitowac 2900 & Klemm 806