Dredging and Sludge Volume Reduction

The scope of work included volume reduction dredging in Guard Basins 5 and 6 using Handex’s LWT Pit Hog 40 HP hydraulic remote-controlled dredge. Dredging was performed along the entire length of the berms in both basins, extending 50 feet back from where the catwalks meet in the middle. From that point, a 3:1 slope was cut back to approximately 15 feet in front of where the catwalk met the land. Work began in the areas farthest from the weirs and progressed toward them in each basin. After dredging each basin, the dredge was positioned behind the catwalk to remove the remaining material and then lifted over the catwalk to avoid disturbing it. A section of the catwalk between Basins 5 and 6 was removed to allow access for the dredge. All dredged material was pumped to a designated spoils area through 6-inch HDPE piping using a 6-inch DV150I pump. Through this project, Handex reduced the sludge volume by approximately 8,300 cubic yards.