Underground Infrastructure - April 2023 - 43

EDITION 82 | APRIL 2023 | NASSCO.ORG
Another method for detecting underground
facilities is the use of ground penetrating radar
(GPR). This compact, portable unit is easy to
transport and manipulate in small areas (Figure 3.)
Other methods used may be frequency domain
electromagnetic detectors (FDEM), Seismic
methods (elastic waves), or electrical resistivity
methods. More options are becoming available with
the advancement of science.
Engineers have guidance in investigating
underground assets in two American Society of
Civil Engineers (ASCE) Standards, ASCE 38-22 and
ASCE 75-22. ASCE 38-22 addresses:
* Investigative practices;
* Conveyance of utility data;
* Respective roles in communicating and
deciding the scope of work on a utility project;
* Definition of utility quality levels;
* Guidance in preparing reports, and much
more
Figure 3. Ground Penetrating Radar
Operators trained in using this equipment use the
display screen on the equipment to identify the
location of the facility. The equipment may be a
one man push apparatus, as shown, or a
multichannel array (MCGPR) pulled or pushed
with motorized equipment. The apparatus may
be equipped with a GPS to provide a location for
mapping. The suitability of using this method
depends on soil conditions; heavy, clay soils are
not ideal soil conditions for using this method,
while loose, sandy soils are ideal. This method
can detect metal, plastic, and clay pipes and
cables of different compositions. Using the
MCGPR can also detect voids such as
underground vaults.
With these guidance documents, ASCE defined
Subsurface Utility Engineering (SUE) as an
engineering practice in an ASCE publication entitled
" Subsurface Utility Engineering for Municipalities "
2019. This document as well as the ASCE
Standards may be obtained from the American
Society of Civil Engineers.
From witching sticks to multifaceted electronic
equipment and defining a new discipline of
engineering, locating and identifying underground
facilities have become more exact. With this wealth
of available equipment and knowledge,
municipalities and other governmental agencies
now have a wealth of resources to identify and
manage their underground assets more precisely
than before.
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Underground Infrastructure - April 2023

Table of Contents for the Digital Edition of Underground Infrastructure - April 2023

Underground Infrastructure - April 2023 - Tip1
Underground Infrastructure - April 2023 - Tip2
Underground Infrastructure - April 2023 - 1
Underground Infrastructure - April 2023 - 2
Underground Infrastructure - April 2023 - 3
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