Many major shipping channels are only 40 feet deep, and in some cases more shallow. Waterways across the country, such as the Delaware River, are being considered for dredging. This produces a significant amount of sludge that needs disposal. A substantial percentage of dredged material is contaminated. Landfills charge handsomely for accepting this substance.
Additional funds go toward transportation, which can also be expensive.
Therefore, brownfields near dredging operations are cost-effective destinations for this resource.