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Case Studies

Remediation Wells for Auto Parts Manufacturer—Detroit Area, Michigan

GeoTrans, a Tetratech company, provides consulting and cleanup services for a major auto parts factory in the Detroit area. The plant covers several acres and has several operable units with discrete source areas, each with a unique cleanup challenge. DTD has worked with GeoTrans on several projects to install horizontal wells for pilot projects and operational wells for dual phase extraction and soil vapor extraction at the site. Results have been promising, with a 90% VOC reduction over a three month period in one pilot test.

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Desalination Plant Infiltration Well Monterey Bay–Sand City, California

The City of Sand City, California constructed a desalination plant to convert brackish groundwater from the ocean/groundwater interface into potable water for residential and commercial use. Brackish water is pumped from vertical wells to supply the plant. The discharge from the plant has the approximate salinity of seawater but environmental constraints made it difficult to obtain permitting to use a surface or subsurface outfall to discharge the brine directly to the ocean.

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Escambia Wood Treatment Superfund Site–Pensacola, Florida

In the summer of 2009, DTD installed our longest horizontal well to date for groundwater remediation. The 1,450 foot long multi-screen well intersects a naphthalene plume downgradient from a source area at the Escambia Superfund site in Pensacola, Florida. The Escambia site encompasses an old wood treatment plant that used creosote and pentachlorophenol for wood preservation. The site has been the focus of ongoing cleanup efforts to remove or reduce soil and groundwater contamination. Black & Veatch, of Alpharetta, GA, is currently managing the site characterization and cleanup activities.

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Horizontal Well Used in Pilot Study of Air and Ozone Sparging of TCE at Camp Lejeune

A one year pilot test performed at Camp Lejeune by CH2MHILL, NAVFAC Atlantic and Camp Lejeune EMD found that air sparging below a low permeability layer, using an HDD well, resulted in extensive lateral distribution of air, and rapid reduction of dissolved TCE and associated cVOC compounds. Within one year, TCE removal exceeded 99% in all monitoring wells with baseline concentrations exceeding 50 mg/L.

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Evolution of a Horizontal Well

Originally appeared in Horizontal News, Fall 1996, published by Colorado Center for Environmental Management for the Department of Energy Office of Science.

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