Stabilization for dry excavation of fly ash requires the extraction of water, of which there are three distinct sources—free water, from precipitation or sluicing; groundwater, which intrudes from the bottom, and interstitial water, found in the pore spaces of the ash.
Comprehensive capabilities for CCR management
Engineering and Design
Pumps and Equipment
Filtration and Treatment
Maintenance and Operation
Using Siltermops to minimize suspended solids, pumps remove free water
Deep wells, wellpoints or eductors remove groundwater below the ash pond.
Shallow wickpoints on a grid drain the ash inside the pond.
Ash Recovery Project – Tennessee Valley Authority
Griffin was contracted to lower water in ash more than 10’, creating a stable working platform and allowing a barrier wall to be constructed.