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Engineering Geology

Engineering Geology - geomuseu

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Chapter 8<br />

with various previous uses and contamination. They should not be used to contain oily or<br />

gaseous contamination. Another method is to isolate the contaminants by in situ containment<br />

by using, for example, cut-off barriers. Encapsulation involves immobilization of contaminants,<br />

for instance, by the injection of grout. Low grade contaminated materials can be diluted<br />

below threshold levels by mixing with clean soil. However, there are possible problems associated<br />

with dilution. The need for quality assurance is high (unacceptable materials cannot be<br />

reincorporated into the site). Other less used methods include bioremediation of organic<br />

material, soil flushing and soil washing, incineration, vacuum extraction and venting of volatile<br />

constituents or removal of harmful substances to be buried in containers at a purpose-built<br />

facility.<br />

451

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