The storm water retention basin at a Kentucky Stone Quarry overflowed its banks and flooded two adjacent mine shafts during the Spring of 2006. A site survey estimated that approximately 18,000 cubic yards of aggregate sediments at 40% dry weight solids had accumulated in the basin, decreasing its storage capacity by greater than 50%. The objective of this project was to dredge the storm water retention basin to its bedrock bottom and simultaneously increase the storm water retention basin’s berm height by seven feet, to protect the shafts from future flooding events.

DOWNLOAD PDF Applications & ProductsGeotextile Tube Containers, Dewatering, Polymer Makedown Units, PolymerServicesTurnkey Project Management, DewateringIndustryMiningLocationKentucky, USA

OBJECTIVE

The stormwater retention basin at a Kentucky Stone Quarry overflowed its banks and flooded two adjacent mine shafts during the Spring of 2006. A site survey estimated that approximately 18,000 cubic yards of aggregate sediments at 40% dry weight solids had accumulated in the basin, decreasing its storage capacity by greater than 50%. The objective of this project was to dredge the stormwater retention basin to its bedrock bottom and simultaneously increase the stormwater retention basin’s berm height by seven feet to protect the shafts from future flooding events.

SOLUTION

It was calculated that 1,100  feet of 45 ft circumference geotextile tube containers would be needed to dewater and contain this dredge volume to greater than 60% solids. The resulting volume and mass of residuals at 60% solids would be 3,895 cubic yards and 3,960 tons, respectively. WaterSolve and the dredging contractor completed the installation of the geotextile tube containers, temporary piping, and the polymer make-down and feed equipment in October 2006. In order to maximize the containment and consolidation efficiency of the geotextile tubes, WaterSolve recommended that the facility re-fill the geotextile containers at least three times in order to maximize their containment capacity and dewatering efficiency.

The dredging contractor and WaterSolve were contracted by the Kentucky Stone Quarry to dredge 18,000 cubic yards of aggregate sediments from their stormwater retention basin and dewater the residuals in 1,100 feet of 45’ circumference geotextile containers located between the basin and storage shafts.

THE RESULT

Sediments were chemically conditioned with Solve 9350 in-line with the polymer make-down unit and initially dredged into four geotextile tube containers (45’ circ. x 100’ long) at 850 (GPM) over three days. As the first 100 feet of geotextile container approached 75% solids capacity, two 45’ circ. x 200’ long geotextile containers were brought online. The first containers were pulse-filled to capacity, and the remaining volume was pumped to the second set of geotextile tubes. Overall, dredging of this stormwater basin required 370 gallons of Solve 9350, rental of a polymer make-down unit, 1,100 feet of geotextile containers, and 2-weeks of dredging time to fill all geotextile tubes to 90 percent of dewatered volume capacity with greater than 85% dry weight solids.

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