Removal and Management of Sediment From Stormwater Ponds

Stormwater ponds are designed to capture runoff from developed areas and force the water to remain in the pond for several hours, slowing the velocity and allowing at least larger particles of sediment to settle out of the water. This is an effective treatment method, but it is one that requires on-going maintenance. This maintenance can be more costly if the sediment is contaminated. Because the pollutants attach to the sediment particles, the sediment removed from stormwater ponds is not always safe for reuse. In order to safely remove and dispose of the sediment, there is a multi-step process that must be followed in Minnesota. The process involves sampling the sediment to be removed; having the samples analyzed by a laboratory for at a minimum copper, arsenic, and PAHs; designing an appropriate construction and removal plan; disposing of the material; and maintaining records of the disposal location.