Eric Bradley | January 8, 2018
During a cut-fill phase of an industrial project, a company was responsible for filtering and discharging heavily contaminated water into a nearby basin within a protected forest conservation area. Impending rain events posed a particular challenge during the dewatering, as the underlying red clay threatened to wash into surrounding stormwater basins, creating sediment-filled water that would re-enter the environment with turbidity levels much higher than the MDE allowed.
HaloKlear DBP-2100 and HaloKlear GelFloc segmented socks were applied across seven semi-passive dewatering systems. Each manifold system pumped between 250,000 and 1,000,000 gallons of water. The HaloKlear DPS manifolds pumped at 200 gallons per minute into large sediment bags, which pushed the water across excelsior blankets and finally through filter cloths and into the discharge basins.
The untreated discharge water contained turbidity levels as high as 1712 NTU, with an average contaminant level of 703 NTU. Once treated with HaloKlear, effluent water being discharged averaged a mere 19.67 NTU, well below the Maryland Department of Environment threshold of 150 NTU.