A Citizen's Guide to Capping - US EPA

A Citizen's Guide to Capping What Is Capping ? The cap design selected for a site will depend on several factors, including the types and concentrations Capping involves placing a cover over contaminated of contaminants present, the size of the site, the material such as landfill waste or contaminated soil. amount of rainfall the area receives, and the future Such covers are called caps. Caps do not destroy or use of the property. Construction of a cap can be remove contaminants. Instead, they isolate them and as simple as placing a single layer of a material over keep them in place to avoid the spread of contamination. lightly contaminated soil to placing several layers of Caps prevent people and wildlife from coming in contact different materials to isolate more highly contaminated with contaminants. wastes. For example, an asphalt cap might be selected to cover low levels of soil contamination on a property How Does It Work? whose future reuse requires a parking lot. A cap for a hazardous waste landfill, however, might require A cap isolates and prevents the spread of contamination several layers, including a vegetative layer, drainage in several ways.

Title: A Citizen's Guide to Capping Author: U.S. EPA, Office of Solid Waste and Emergency Response Subject: The Citizens' Guides are 2-page fact sheets that explain, in basic terms, the operation and application of the most frequently used innovative treatment technologies.

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