DTD has just completed the installation of two sparge wells beneath a mid-west tank farm. The above ground storage tanks (ASTs) were formerly used for storage of up to 2,000,000 gallons of benzene. Left over from those days, is a groundwater contaminant plume that has long been controlled by a perimeter collection trench. However, the client wishes to clear its liability by remediating the source, and to eventually be able to shut down the groundwater collection system.
Two horizontal sparge wells were specified, passing directly beneath one of the ASTs. As the tanks are considerably over 100 feet in diameter, standard walkover locating was not possible. DTD’s experience in drilling beneath tanks or other structures that prevent walkover locating (munitions landfills, nuclear waste storage, large petroleum tanks, etc.) came in handy.