| Project Background |
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| As part of an overall site assessment
for the future use of this state-owned property, Geo-Graf
was retained to perform a nonintrusive utility
investigation in an attempt to locate and document the
major metallic and nonmetallic subsurface utility
systems. Existing utility prints, "As-Builts",
and a recent CAD drawing generated from aerial
photography were provided for incorporation of the
utility search findings. |
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| Geo-Graf Investigation |
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| The nonintrusive delineation techniques used by
Geo-Graf included: Ground Penetrating Radar (GPR),
Electromagnetics (EM), Radio Frequency (RF) and Magnetic
(MAG) geophysical instruments. Detected utilities were
field-marked on-site and documented with reference to
existing site landmarks. Both metallic and non-metallic
utilites were delineated at the site. |
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| GPR Data Profile |
| Please Wait as
the image below loads. It is actual radar data showing
several underground utilities collected by Geo-Graf
engineers utilizing a 120 MHz GPR antenna. |
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| Above: A GPR data profile over a
section containing multiple utilities. Identification of
the detected utility systems were based on existing
mapping and surface features. Depths to the tops of the
various utilities based on GPR data estimates range from
2' to 7' below cover. 120 MHz GPR antenna system, edited
from 80ns range. |
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