In Situ Services |
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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. |
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CPT Services |
- Piezocone Penetrometer
- Seismic Cone Penetrometer
- Electrical Resistivity Cone Penetrometer
- In-situ hydrocarbon screening using ultraviolet
optical screening tool (UVOST)
- In-situ resistivity and hydraulic conductivity analyses
- Seismic analysis (shear wave velocity determination for liquefaction studies)
- SPT Energy Calibration
- Portable systems available for over water or limited access
- Soil Remediation (ORC or HRC Injection)
-
Membrane Interface Probe
(MIP) with CPT
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 Go to CPT EQUIPMENT Page,
for more about gREGG'S cone penetration testing equipment. |
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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.
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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
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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:
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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.
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Horizontal Cross Sections |
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