Relevance of Project Soil Bentonite and Cement Bentonite Cutoff Walls Excavation with extended reach backhoe Low permeability of the backfill Relocation of existing utilities Excavation of cutoff wall around fiber optic cable Substancial amount of earth[…]

Relevance of Project Cement Bentonite Cutoff Walls Excavation performed with extended reach backhoe Low permability for the CB backfill Minimum unconfined compressive strength of CB backfill at 3 days of 30 psi or more Construction in[…]

In 2008, the Wisconsin Department of Transportation issued a fast track project to replace County Hwy A. Hwy A was washed out earlier in 2008, when Lake Delton flooded. The soil bentonite slurry wall was 550 feet long and reached a maximum depth of 110 feet. The cutoff wall was excavated with a combination of Koehring 1266 hydraulic excavator and a KS3000 hydraulic clamshell attached to an 863 crawler crane. The soil bentonite backfill was mixed adjacent to the trench using a low ground pressure bulldozer. The specified hydraulic conductivity for the backfill was k £ 1×10-7 cm/sec.

The city of San Antonio Water Board desired to construct a dam and reservoir for water impoundment. The design included a deep soil bentonite cutoff wall to stop seepage under the future dam through pervious sand layer. HB Zachry was awarded the contract and selected Inquip Associates, Inc. for the construction of the soil bentonite cutoff wall. Approximately 2,000 linear feet of soil bentonite cutoff was constructed to a maximum depth of 115 feet.

A chemical manufacturer was required by the USEPA to construct a barrier wall between a chemical landfill and the Mississippi River. Most of the alignment of the cutoff was within 60/80 feet from the Mississippi river. In 2003, Inquip was awarded the contract to construct 3,350 linear feet of soil bentonite cutoff wall to a depth varying between 135 and 155 feet. The trench was excavated with a combination of extended reach excavator and 2 hydraulic clamshells.

In 1998, Inquip Associates Inc., as a subcontractor to Sverdrup Environmental, constructed a 1,500 linear feet soil bentonite cutoff wall, to maximum depth of 110 feet. The cutoff wall was constructed around a plume of chlorinated solvents.