The Job
An abandoned water treatment plant at a federal facility was being rehabilitated and brought back into service.
The Challenge
As part of the project, all activities were being moved above grade. A 12′ deep tank below the building floor needed to be filled before installing a new floor. The pit had been designed for holding water, and the majority of the pit was below ground water levels.
The designer had two competing interests–given the closeness of the water table to finish floor, avoid any buoyancy of the fill material, while using the lightest possible material to avoid inducing any settlement.
The Solution
CJGeo proposed filling the pit with CJFill-UW, at 70lbs/cuft. At 70lb/cuft, there are no uplift concerns, and the material is just barely denser than water, which helps minimize the amount of anticipated settlement. To help ensure future excavatability, CJGeo used a sanded base slurry (as opposed to the usual neat mix slurry) to generate 830CY of material.
