2. Multi‐Electrode Resistivity
Implant Technique (MERIT)
What is MERIT ?
MERIT is an innovative patent‐pending technique that uses
implants to obtain deeper and higher resolution geophysical
images than what is possible with typical surface geophysical
methods.
What is MERIT ?
MERIT is an innovative patent‐pending technique that uses
implants to obtain deeper and higher resolution geophysical
images than what is possible with typical surface geophysical
methods.
Through the
innovative use of
implants MERIT can
significantly increases
the amount of data at
depth creating higher
resolution images of
the subsurface than
what was has been
possible.
Sensitivity image on the left is standard data
collection “yellow” area . The image on the right is
MERIT .

3. What makes MERIT
Different ?
What makes MERIT different? Its simple, we take advantage
of direct push technology, a drilling method that is fast and
efficient to install implants deep into the subsurface. In this
way we image deeper. By using a surface and an implanted
array we create a computer tomographic (CT) geophysical
images at increased depth and an improved resolution all
with one simple installation procedure !
The Figure shows
the installation of
the MERIT
implants by direct
push technology.
Implants placed
near the top of rock
will provide image
between the
implants as well as
into the rock.

4. How is MERIT like Computer
Tomography (CT) ?
MERIT is unique in it uses what is called the offset method.
This method takes slices of the subsurface by moving the
surface array an angle distance from the implant array.
The MERIT offset
method takes slices
of the subsurface to
produce a quasi ‐3D
images. The offset
images can be used
to help determine
the relative size of
subsurface features.
Another beneficial feature of MERIT is that SP measurements
taken at the same as the offset method provides a quick cost
effective way of conducting a combined MERIT/SP survey.

5. A landfill in Tampa, Florida was imaged using standard
surface electrical resistivity and MERIT. Fourteen (14)
MERIT implants were installed in 0ne (1) day using a
Geoprobe to 20 feet.
Case Study: Comparison of Surface Electrical
Resistivity Versus MERIT
Arrow indicates the
same location on
both images
Surface electrical
resistivity
• Only part of the
limestone surface
was imaged at 30
feet
• No evidence of
potential sinkhole
MERIT
• Depth 62 feet
• Dimensions of the
landfill/sinkhole
clearly seen
• Engineers ground
stabilization plan
based on results of
MERIT

6. An Additional Feature
Self – Potential (SP)
Self‐Potential is the only geophysical measurement that
can track the movement of water. When combined with
MERIT, measurements taken both horizontally and
vertically define the 3D movement of water .
In the example below, MERIT was used at a sinkhole at
USF to defined the geometry of the sinkhole while the
SP measurements confirmed that water was entering
into the sinkhole

7. The Process
 MERIT profile
identifies deep
geologic features
 MERIT Offset
Method quasi‐3D
profile horizontal
SP data taken at
same time
 Horizontal SP gives
1D image flow into
deeper aquifer
 Vertical SP gives
2D vertical flow
into deeper
aquifer

8. Benefits of using MERIT
 Infrastructure Projects /DOT
 Bridge Foundations
 Depth to Rock Determination for Pilings
 Ground Modifications
 Sinkholes
 Landfills
 Dams & Levees
 Environmental Contaminate Investigations
 Remediation Chemical Injection Monitoring
 Hydrogeological Investigations
 Identify Leakage Pathways in Well Fields
Beneficial uses of MERIT for:
Just like doctors now rely on CT or MRI scans more than X‐
ray’s MERIT provides engineers and geologist a similar leap
forward in imaging technology for the subsurface.
Like the old saying “Seeing the problem is half the
battle”. Using MERIT can provide you much higher degree of
confidence, help focus resources and reduce your liability
through its advanced geophysical imaging technology. We
understand project budgets, MERIT was specifically
designed to provide you with a cost /benefit ratio that is
within your budget .

9. Contact us
The G3 Group is a certified WBE and DBE and would
like to talk to you about teaming opportunities or
presentations for MERIT
For information please contact :
David Harro P.G.
G3 Group
2509 Success Drive
Suite 1
Odessa, Fl 33556
Office (727) 376‐7833
Cell (727) 647‐2758
Email
Info@geo3group.com
David.Harro@geo3group.com
www.geo3group.com