De Pere & Manitowic, WI - Dewatering / Filtering Drilling Sediments

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Courtesy of TenCate Geosynthetics Netherlands bv

TenCate develops and produces materials that function to increase performance, reduce costs and deliver measurable results by working with our customers to provide advanced solutions.

THE CHALLENGE

Lunda Construction was subcontracted by Michels Corporation to provide 35' diameter down-shafts to facilitate the installation of a pipeline between the Manitowoc River and the Fox River in DePere, Wl. Two 4' submersible pumps (approximately 500 gpm) were used to pump out water from each flooded shaft. Shafts were flooded on purpose to suppress explosive blasts in the rock of the down-shafts during excavation. A 40 mg/L total suspended solids iTSS) permit limit was issued for this project by Wisconsin DNR, limiting the liquid residuals to be discharged to any surficial receiving systems.

THE SOLUTION

Lunda Construction contacted WaterSolve, LLC (TenCate Geotube Distributor) for technical assistance regarding containing the solids and ensuring the discharge limits were met. WaterSolve, LLC identified a dual polymer chemical conditioning program which would achieve or exceed regulatory requirements, along with Geotube£ containers designed to fit the application and site needs. Lunda facilitated the construction of appropriate bermed lay-down areas lined with clean rock at both the Manitowoc and De Pere facilities along with the use of a small barge at De Pere to contain all the solids in the Geotube containers. With this technology, Lunda and Michels were able to contain and dewater a full year of residuals production into the onsite Geotube containers at De Pere and two Manitowoc sites. Geotube technology, with WaterSolve's experience and chemical expertise, minimized the excavation and hauling costs. WaterSolve completed installation of the Geotube£ containers, temporary piping, and polymer make-down & feed equipment

Dewatering with Geotube technology is a three-step process. In the confinement stage, the Geotube container is filled with dredged waste materials. The Geotube container's unique fabric confines the fine grains of the material. In the dewatering phase, excess water simply drains from the Geotube container. The decanted water is often of a quality that can be reused or returned for processing or to native waterways without additional treatment. In the final phase, consolidation, the solids continue to density due to desiccation as residual water vapor escapes through the fabric. Volume reduction can be as high as 90 percent.

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