EGS
provides a vast array of topographic and land geophysical
surveying techniques. In addition to carrying out these
valuable cost-effective surveys, EGS can advise on a variety
of technical issues. Choosing the right equipment, for instance,
is crucial to the success of the survey. Our experience
of most topographic, geophysical and drainage and sewerage
survey techniques helps you make the right choices.
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See the “Download”
section to obtain PDF file brochures.
Topographic
Surveys
EGS
provides total surveying and mapping services to the engineering
and mining industries. New topographic survey equipment,
software and methods are producing quantum leaps in the
productivity of survey teams. Geodetic control surveys are
achieving unprecedented levels of accuracy, using advanced
GPS techniques. And EGS is committed to remaining at the
leading edge of all such technological innovations.
Land
Geophysical Surveys
Options
for land geophysical investigations now cover seismic refraction
and reflection, nuclear, electric, electromagnetic, radar,
gravity and magnetic techniques for both surface and borehole
applications.
EGS
has helped to develop detailed applications of gravity and
magnetic surveys for engineering problems such as slope
stability studies, solution cavity investigations and site
geological mapping in urban and industrial environments.
Through
the use of seismic refraction and reflection surveys, EGS
has provided numerous clients with an economical survey
method to map terrestrial subsurface geology. This method
is commonly used for excavation investigations and utilities
infrastructure searches.
Electrical
resistivity measurements using Wenner and Schlumberger depth
sounding techniques as well as resistivity profiling are
carried out for Ground Water Investigations and Electrical
Earthing Studies.
Ground
Penetrating Radar Surveys using a range of antenna from
50 MHz to 400 MHz are available to profile geological structure,
map out underground cavities and locate utilities.
Using
a combination of in-house developed tools and Robertson
geologging downhole sondes, EGS undertakes both downhole
wireline logging and crosshole seismic and radar profiling.
The range of downhole logging services includes acoustic
borehole televiewer, borehole CCTV camera, verticality sonds
seismic sonds and a range of nuclear sonds. In addition
cross-hole P and S wave seismic measurements and radar surveys
are available to map structures between borehole pairs and
to determine soil and rock mass moduli.
Surveys
for the Utilities Industry
Together
with joint venture partners General Underground Services
(GUS), EGS undertakes a complete range of specialist drainage
and sewerage surveys, including CCTV, Man-Entry, Manhole
Flow Surveys, Water Sampling and Monitoring. The survey
techniques are used to map the location and inspect the
internal condition of drainage and sewerage networks, as
part of Leakage Detection Surveys, for Model Calibration
and Environmental Studies. All survey work is undertaken
by fully trained technicians with the relevant Water Training
International (WTI) certification.
Through
the use of seismic refraction and reflection surveys, EGS
has provided numerous clients with an economical survey
method to map terrestrial subsurface geology. This method
is commonly used for excavation investigations.
In partnership
with All Water Technology, EGS provides a comprehensive
range of both technical and management services to the water
supply industry. The range of services includes Leak Detection,
Underground Utility Mapping, Flow Monitoring, Pressure Optimization
and Management, Water Audit and Consultancy. The services
are widely used in the Water and Civil Engineering Industries.
Using
portable Differential GPS systems, digital cameras and palm
top computers, EGS undertakes Asset Management Surveys of
a range of assets from street furniture to civil engineering
structures and open river channels. The location and condition
of the assets can be entered into field data acquisition
forms and later down loaded into commercial asset management
software packages such as MapInfo and InfoWorks.
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