EVENTS NEWS HOME
WHO WE ARE WHAT WE DO HEALTH & SAFETY TECHNICAL RESOURCES CONTACT US
levee-dam-reinforcement-repair
Vertical Barriers/Slurry Walls Bio-Polymer Trenches Permeable Reactive Barriers Soil Mixing Jet Grouting Wetlands Site Remediation Dam Grouting MGP Sites Levee/Dam Reinforcement & Repair
 

Vertical Barrier Installation


Canton, OK: Soil-Bentonite Slurry Wall, Canton Lake

levee-vertical-barrier-installation-canton-lake-ok

Geo-Con was contracted by the U.S. Army Corps of Engineers to install a soil-bentonite cutoff wall that ties into the Canton Dam. The cutoff wall is part of an active retention structure between Canton Lake and a new auxiliary spillway system being installed for Canton Lake.

The wall extends though several permeable zones into the Dog Creek Shale key-in layer, creating an impermeable barrier. Geo-Con installed 83,998 vertical square feet of trench to an average depth of 54 feet with a maximum depth of 81 feet below ground surface. The wall was excavated using a Komatsu PC1250-LC excavator.

Geo-Con met and exceeded the quality control standards set by the U.S. Army Corps of Engineers. The specifications required the soil-bentonite backfill to be mixed with pugmill mixing plant. Trench spoils and backfill was transported to and from the pugmill with off-road dump trucks. All backfill samples exceeded the ultra-low permeability requirement of 1x10-8 cm/sec.

Geo-Con's scope of work included exploratory borings along the alignment prior to installing the slurry wall in order to determine the profile of the Dog Creek Shale layer. The borings showed that the shale layer was deeper than anticipated. This led to a change to Geo-Con's contract to extend the slurry wall on the east and west ends. In addition, a change the east end of the wall was necessary and was done with a vertical tie-in to the existing dam structure. This section of wall was backfilled using a tremie pipe held with a crane to avoid freefall and voids within the slurry wall.

Geo-Con installed a permanent cap on the slurry wall using geosynthetics and compacted soil.



 

Corporate Headquarters: 1250 Fifth Avenue • New Kensington, PA 15068 • 724-335-7273

© 2014