Project Summaries Part 2
Directional Technologies has completed 100's of horizontal remediation well installations. The following are brief abstracts of representative work performed by DTI. Full project summaries and references are available on request.
Bioamendment Injection
Bioamendment Injection with Horizontal Wells
A rail yard with a long history of operation in the metropolitan New York area was ordered by the USEPA to remove petroleum hydrocarbons from soils beneath multiple rail lines. Directional Technologies, Inc. installed 14 wells, crossing as many as 4 railroad tracks while the railroad continued its normal, busy operations. Hundreds of hours of down-time by the railroad and tens of thousands of yards of hazardous waste disposal were avoided by the successful installation of the horizontal well injection system.
The crew is setting up to begin drilling. Notice the green and blue mark-outs near the railroad tracks.
The horizontal well is being installed parallel to the railroad tracks.
Bio-injection via directional drilling
While on site in an upscale neighborhood in Westchester County NY, Directional Technologies, Inc. representatives carefully explained to residents the benefits of horizontal wells and directionally drilled beneath two residential structures for bioremediation.
The well bores were drilled to specific target locations and the drill rig was then used as a delivery system for the bioamendment. The residents were extremely pleased with the directional drilling process and lack of disturbance to their well manicured properties.
Project Results: The injections worked as planned and the site was closed.
Chemical Oxidation
Chemical Oxidation with Horizontal Wells
A major urban high-rise development project in Annapolis MD required in-situ treatment of dry cleaner solvents. Ten horizontal wells were drilled under an active construction site for potassium permanganate injection. The system was installed in four weeks without disrupting ongoing construction of building and roads. The horizontal well system has successfully injected 1.3 million gallons of oxidant solution. Several injection events occurred while high-rise construction continued at the site.
For more information on this project, please follow this link to the two papers presented at the Battelle Conference in May of 2008 - Proceedings of the Sixth International Conference on Remediation of Chlorinated and Recalcitrant Compounds: Enhanced Delivery of Potassium Permanganate Using Horizontal Wells.
W.M. Moran and G. Losonsky, Achieving Delivery Goals with Engineered Screens. G. Losonsky
and M.J. Sequino
Dual Phase Extraction
Horizontal Dual Phase Extraction Wells Under A Truck Stop
The owner of a truck stop had zero tolerance for any business interruption. The site required a technology that would allow normal business activities to continue. Directional Technologies' crews coordinated with the on-site manager to install a horizontal well under the entrance to the truck stop that had 20 to 30 trucks an hour passing over the bore path. A walkover locator was used to keep the project cost-efficient without disrupting the business activities. This well had precise entry and exit points, and a 60º turn that was achieved.
Project Results: The system operated for 3 years and the site was closed.
The drill rig was set up behind the gas pumps. The horizontal wells were installed without distrubing business.
Groundwater or total fluids extraction
Horizontal Wells at a Superfund Site
Directional Technologies, Inc. was contracted because of its reputation for quality work. The experienced crew drill and installed 8 inch HDPE under a building at a percent grade for a total well length of 800 feet. The company worked closely with the environmental consultant during well design to provide his client with the most efficient horizontal system possible for the site. The original well design was amended several times and the final design was implemented. The well currently produces as much as 40 gallons per minute, meeting and exceeding all client expectations. The well is presently used for hydraulic control.
Horizontal Groundwater Extraction Well Project and Prototype Horizontal Tracking Equipment
Directional Technologies, Inc. was involved with an innovative remediation project from design to installation. The in-house environmental engineer used the company's directional drilling experience to select the proper well materials and determine well placement for one of the first horizontal groundwater extraction wells drilled using standard directional drilling equipment. New prototype directional steering tools were field-tested on this project. Also, due to subsurface conditions, this project resulted in pioneering methods to overcome ground interference in the tracking system caused by metallic obstructions.
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Soil Sampling
 Horizontal Groundwater Sampling and Extraction Wells
NJ DEC mandated soil sampling under an existing pharmaceutical company's building. During this high profile project, the company drilled 120 feet under the building through a inch footer into what they thought was going to be fill. After steering through rock to the target point a inch PVC blind monitoring well was installed at a depth of 20 feet under the building. The well is still operating to monitor for contaminants.
Soil Vapor Extractions
Horizontal Remediation Well Pilot Test at JFK Airport, NY
This project was the stepping-stone that literally created the horizontal remediation industry. An environmental consultant needed an experienced directional driller with a creative and educated approach to conduit installation. This pilot test would be the basis to install over 40,000 of horizontal remediation wells. It was crucial that the directional driller chosen be able to contribute his experience and knowledge to the project to insure the pilot test achieved the correct pitch, depth, and radius in challenging site conditions.
Directional Technologies, Inc. rose to the challenge and installed three 200 feet inc horizontal wells at depths of 6, 10, and 14 feet. The wells were installed at a busy airport terminal with major instrumental interference from reinforced concrete and from other equipment in the area. The pilot tests were a success and the full-scale soil vapor extraction and air sparge system is still used today. This project is frequently used as the primary horizontal remediation case study.
Horizontal Liquid Ring Extraction Well under a vehicle maintenance facility
A horizontal liquid ring extraction well was installed under a busy vehicle maintenance facility. The Environmental Consultant worked closely with Directional Technologies, Inc. to design unique well placement on a property that demanded a discrete remediation approach. DTI also provided the design to reduce the amount of silt that was being pulled into the horizontal well and subsequent procedures to maintain the maximum efficiency of this horizontal well.
Horizontal Wells under an active manufacturing facility
The experienced directional drilling crew drilled and installed 3 SVE wells, two blind wells and one continuous well. During this project, Directional Technologies, Inc. worked with the drilling fluid additives manufacturer to field test prototype directional drilling mud specifically designed for horizontal remediation wells. Blind wells, without an exit point, are typically more difficult to install and these wells proved to be extremely challenging due to the site and soil conditions. The crews were in constant communication with the busy manufacturing facility on site to prevent any disruption to the factory while directional drilling activities proceeded. The crew also overcame challenges presented by manufacturing equipment inside the facility that interfered with the signal needed for the directional tracking instrumentation to function. Despite these challenges, the installation of the horizontal wells was successful.
Horizontal Wells at Aberdeen Proving Grounds
Directional Technologies, Inc. drilled, installed, and developed one air sparge well 15 feet in depth next to a former gas station site. The crew installed the horizontal well in three days despite very limited and confined space at the site. The entire length of the well was swept for unexploded ordinances prior to well installation. Directional Technologies, Inc. conferred with environmental consultants on how to use existing wells to reach a new hot spot.
Project Results: The site achieved closure but was reopened after discovering an unknown "hot spot". The system operated for approximately two years.
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