Chapter 5: In-Situ Capping

Authors: US Environmental Protection Agency


Reference: US Environmental Protection Agency. (N.D.) Chapter 5: In-Situ Capping. (5-1) – (5-16).

Summary: In situ capping is discussed for remediation purposes. The possibility of applying a cap in thin layers is mentioned in the case of enhanced natural recovery and to backfill dredged areas. A clear distinction is made between thin layer placement and in situ capping. The recolonization of the capping material substrate is discussed. The thinner layers of placed material resulting from longer descents of sediment in the water column is discussed. The biogeochemical effect of making the sediment more anaerobic as a result of capping are covered. Considerations for plant growth on the cap and erosion potential of the cap are discussed. The possibility of turbidity issues during placement and methods of material placement are reviewed.

What You Will Find Here: Introduction p. 5-1, Advantages and Limitations p. 5-2, Site Conditions p. 5-3, Sediment Characteristics p. 5-4, Physical Isolation p. 5-8, Stabilization/Erosion Protection p. 5-9, Identification of capping materials p. 5-11, Placement Methods p. 5-13, Highlight 5-3 p. 5-15