DTI installs horizontal remediation wells under busy intersection

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Courtesy of Directional Technologies, Inc.

The Issue

A retail gasoline station in Tallahassee Florida with leaking underground storage tanks sits atop a local groundwater divide, causing petroleum hydrocarbon plumes to migrate in opposite directions from the site. In one direction, the plume has migrated under a residential neighborhood on downward sloping terrain, and in the opposite direction, the plume has migrated under a major intersection of two 6-lane US highways and under a fast-food restaurant building and its parking lot and drive-through lanes.The site is being remediated under a Florida state petroleum cleanup program. The preferred remedy selected under the state program was air sparging accompanied by soil vapor extraction (SVE), but the implementation proved to be difficult or impossible using vertical wells, due to the lack of available ground locations for wellheads and piping.

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