Tag Archives: Clay

Vapor Extraction and Pneumatic Control in Clay

Many sites at which remediation using thermal methods is being considered contain thick clay layers in the subsurface. The difficulty with treating clay is that it is not very permeable, meaning liquids will not move through it rapidly. Chemicals often get stuck within the clay matrix and cannot be removed easily unless one heats the clay to boiling temperatures.  But how will the chemicals move out of such a tight material?  If the clay consists of tiny particles and minerals, too small for water to move more than a few meters in a year, how can we get the chemicals … Continue reading

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