| |  | In Situ Services |  | Cone Penetration Testing Services Gregg Drilling & Testing, Inc. (Gregg) offers a wide range of geotechnical and environmental cone penetration testing (CPT) and geophysical testing services. Gregg’s skilled and knowledgeable operators can retrieve data at a faster rate even in difficult conditions, allowing less time on the job and a lower cost to the client. Our highly trained staff can then provide you with the technical support necessary to accurately interpret the cone penetration data we provide and assist you in the design of your site investigation program. Gregg's state-of-the-art cone trucks provide a climate controlled atmosphere and are equipped with computer monitors, printers, and decontamination sinks. The CPT services offered by Gregg are listed below and are discussed in detail in the Technical Methodology section. |
CPT Services | |
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 Go to CPT EQUIPMENT Page,
for more about gREGG'S cone penetration testing equipment. | Cone penetration testing (CPT) is a process whereby soil characteristics are determined when a cone penetrometer is driven into the subsurface. The CPT provides a rapid, reliable and economical means of determining soil stratigraphy, relative density, strength and hydrogeologic information (static and dynamic pore pressure, hydraulic conductivity). Specially designed probes and samplers can be deployed with the CPT rig to obtain additional data pertinent to environmental subsurface investigations. A fuel fluorescence detector (UVOST) is used to collect in-situ measurements of hydrocarbons present in soil and groundwater. An electrical resistivity cone can be used to accurately profile presence of DNAPLs in the subsurface. Specialty samplers are used to collect high-quality groundwater, soil-vapor and soil samples. Employing these methods in your site investigation will allow for a rapid, reliable and cost effective means of assessing the extent of subsurface contaminants while eliminating the generation of investigation derived wastes. The end result is less time and money spent for site investigation, laboratory analyses and waste disposal.
| | Other In Situ Services | Pressuremeter Testing Field Vane Shear Testing Flat Dilatometer Testing Rock Dilatometer Testing Goodman Jack Testing SPT Energy Measurements Instrument Installation
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CONE PENETRATION
DATA PRESENTATION SERVICES
| Gregg has developed a new software application designed to create high quality cross sections and 3D images based on cone penetration testing (CPT) data retrieved during a site investigation. Gregg’s customized version of the software program Viewlog can now be effectively interfaced with CPT data. This powerful new program allows us to import an Auto CAD map of a site and overlay the exact position of the CPT soundings directly on the site map. In addition, cross sections are then easily produced to display cone data, from any number of soundings, side by side and adjusted for elevation. The cross sections can be displayed in either a vertical format (see below) or in a horizontal format which can be constructed to display contour maps (see right). |  Site Map with Cross Sections Displayed
(click on image to view larger)
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Vertical Cross Sections
(click on image to view larger) A number of different parameters can be interpreted and displayed in the cross sections, including: |
The examples of horizontal cross sections, slices of a site, shown below illustrate the intensity of UVOST (ultra-violet induced fluorescence) corresponding to the existence of contaminants at increasing depths. The blue areas depict a reading of zero or no contaminant detected, while the pink areas reveal locations where a contaminant has been detected.
| Horizontal Cross Sections | | |
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