For impacts to special coastal areas, please see the " Coastal" tab. For impacts to streams, rivers, lakes, ponds, flood plains, flood ways, riparian zones, please see the " Flood Hazard" tab. The above tabs provide additional information on permit requirements relating to dredging. Therefore, it is important to closely examine a proposed project relative to the sensitive areas on site. Special areas can be rudimentarily determined using the Department’s online mapping service, NJ-GeoWeb. In some cases, dredging activities are regulated by the Department’s Office of Dredging and Sediment Technology and the Division of Land Use Regulation. Therefore, authorization(s) from both entities may be required.ĭredging may result in impacts to “special areas” that are regulated by the Department. River Sand also provides disposal of the sludge as a turn-key solution.Dredging is the removal of wetlands, State open water soils, or sediments through the use of mechanical, hydraulic, or pneumatic tools in an effort to restore or maintain original bottom contours of waterbodies. Disposal of alum sludge may be provided by the water treatment plant operator and in that case River Sand can provide any necessary trucking or support equipment. Geosythetic dewatering tubes require a larger footprint, flat area, and the timeframe for which the solids require for dewatering before the tube can be opened and solids ready for disposal. Using a belt press or multiple belt presses fit within a smaller footprint and produce solids that can be transported directly to be disposed. Both methods may implement polymer injection to achieve rapid dewatering results. Dewatering is typically accomplished with mechanical dewatering utilizing a belt press or alternatively with a dewatering tube. However, the removal of sludge is often relative to the dewatering capacity, and that is relative to many other factors within the project’s scope of work. Depending on the size of the dredge, it can pump up to 100s of cubic yards per hour which can be calculated to dry solids based on the density. A hydraulic dredge with an auger cutterhead can be set up within a pond or lagoon on a cable traverse system.
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