Directed Technologies Drilling Incorporated (DTD)

Horizontal Soil Vapor Extraction Services

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Soil vapor extraction is an in-situ remediation technology that utilizes a vacuum to extract contaminated vapors adsorbed to soils and treat the vapors prior to release. Studies have found this technology to be most effective for remediation of volatile organic compounds and some semi-volatile organic compounds. This technology is often used in combination with air sparging or biosparging.

A horizontal soil vapor extraction system has a longer interval of screen in contact with the contaminated zone and provides a greater recovery in the vertical dimension, creating a much greater zone of influence than typically can be achieved with vertical wells. Horizontally drilled extraction wells are therefore more efficient and are also less likely to short-circuit to the atmosphere than those installed by trenching, since the soil column is not disturbed during the installation process.

In a horizontal system, the line acts as both the recovery and the conveyance lines. The same pipe provides both the screened section to extract vapors and a blank section to carry the vapors back to the surface. A single pipe can thereby replace both a series of vertical wells and the near-surface trenched conveyance lines required to transport the extracted vapor to the treatment system. We have installed these horizontal soil vapor extraction systems at dozens of sites where there was no disruption of normal site activities.

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