Two types of capping are often used at dredged material disposal sites. The first is known as "level-bottom capping" (LBC). This involves placing the contaminated material on the seafloor in a rounded configuration or mound. The mound is then covered with clean sediment. The other type of capping is called "contained aquatic disposal" (CAD). CAD employs some sort of lateral confinement to prevent contaminated materials from spreading along the seafloor. Methods include placing the material in an existing bottom depression, a constructed pit, or within berms constructed on the seafloor.
Courtesy: Science Applications International Corporation