Capping and Capping Layer
nounPronunciation: /ˈkæpɪŋ ænd ˈkæpɪŋ ˈleɪər/
A protective barrier of clean material placed over contaminated soil or waste rock to prevent contact with surface water and minimize contaminant leaching. Cap materials typically include clay, synthetic liners, soil, or gravel depending on site conditions.
Plain English
A protective cover placed over contaminated mine waste to prevent pollution.
Etymology & History
Usage
"The mining site required a capping layer of compacted clay to isolate heavy metal-contaminated waste rock."
Style guide notes: Distinguish between cap and capping layer; specify cap composition and thickness in technical descriptions.
Also known as
Contrasted with
Related Terms
Frequently Asked Questions
What materials are used for mine site capping?
Clay, compacted soil, geotextiles, synthetic liners, and gravel provide protective barriers over contaminated materials.
How thick should a capping layer be?
Thickness varies by contaminant type and site conditions, typically ranging from 1 to 5 feet for adequate protection.
Why Test Candidates on This?
Fundamental remediation approach tested in site assessment and closure design evaluations.
Required skill level: Mid