| Ground Zero, NY: Freedom Tower Construction, Acoustic Televiewer Logging |
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Borehole Logging Case Study:
Provide Data to Develop Detailed Groundwater Flow at Superfund Site
Problem
Our client sought to develop a detailed groundwater flow model to project the movement of contaminant at a Superfund Site owned by a major defense contractor in the Northeastern U.S.. The correlation and continuity of clay layers in the overburden was a critical factor in the model. The site was large and geologically complex.
Solution
We logged dozens of wells for gamma radiation to locate the clay layers and for temperature to determine where the water was entering the wells. Data from the borehole logging program was used to construct more accurate geologic cross-sections and to fine tune the groundwater flow model of the site, helping our client resolve several questions without needing to install many more borings.
General Applications
- Municipal and industrial groundwater supply investigations
- Construction/engineering applications
- Environmental audits and site assessments
- Evaluation of active and inactive industrial facilities
- Public/private remedial investigations and feasibility studies
- Geological studies
- Mining applications
Specific Applications
- Determine lithologies and their physical properties
- Locate zones of contamination
- Test well casing integrity
- Locate water producing zones
- Correlate stratigraphy
- Locate productive rock fractures
- Locate clay layers in overburden
- Locate zones for hydrofracing
- Locate pegmatites, radioactive ores, and base metals
The parameters measured by borehole logging depend on the instruments used and the data required. Parameters may include temperature, seismic velocities, natural radioactivity, various electrical properties, and diameter of the borehole.
It is our standard practice to provide an interpretation of the borehole logging data. Most other firms provide only the logs to their clients. Our decades of experience and years of research allow us to provide our clients with a clear and concise description of the results, as well as an honest assessment of the limitations.
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In addition to the numerous surface geophysical services we provide, Hager-Richter also offers a full suite of down hole geophysical methods to meet our client's specific needs. Geophysical borehole logging involves measuring the physical properties of the surrounding medium with a sensor located in a borehole. Down hole geophysical measurements are made in situ and thus can provide highly accurate information about subsurface properties. Down hole methods also provide a means of correlating geological formations from one borehole to another. A variety of geologic information can be obtained from down hole surveys.
Borehole geophysical logging can provide information about:
- Lithology
- Formation thickness
- Dip of strata
- Location and attitude of fractures
- Presence of water-bearing fractures
- Formation fluid content
- Condition of well casing
- Depth of bottom of casing
- Sediment porosity/permeability
- Subsurface temperature
- Depth of water table
Video logging can be used to determine:
- Casing conditions
- Rock socket conditions
Hager-Richter owns and operates the ISL Spectrum 100 PTZ camera (pictured below), manufactured by Inuktun. The PTZ series camera has a number of advantageous characteristics:
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Depth Rating |
200 feet, Salt or Fresh Water |
| Lens |
72:1 Zoom (18X Optical, 4X Digital) |
| Illumination |
3 lux, Variable Intensity |
| Pan Range |
340° Mechanical (360° Visible) |
| Tilt Range |
270° |
| Control System |
Variable Speed Joystick Pan & Tilt Control
Can produce in-field display |
Hager-Richter has extensive experience with Acoustic Televiewer (ATV) and Optical Televiewer (OTV) logging. We own Mount Sopris Matrix and MGX II slim-hole logging systems with 1500 feet depth capability. We are are also equipped to provide fluid temperature, fluid resistivity, 3-arm caliper, heat pulse flow meter, electromagnetic induction, natural gamma ray, normal resistivity, single point resistance, and spontaneous potential surveys. Our custom-built borehole video logging system uses a high resolution submersible video camera with depth capability greater than 200 feet and an 18X optical (4X digital) zoom.
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