Lunda Construction was subcontracted by Michels Corporation to drill 35 foot diameter down-shafts to facilitate the installation of a pipeline between the Manitowoc River and the Fox River in De Pere, WI. 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 (TSS) permit limit was issued for this project by Wisconsin DNR, limiting the liquid residuals to be discharged to any surficial receiving systems. Geotube® dewatering technology was selected to retain the solids while ensuring the water discharge levels were met.

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