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GEOPHYSICAL/GEOLOGICAL SURVEYS
Although geologic mapping, drilling,
sampling, and laboratory testing
constitute the principal data
acquisition techniques for most
geotechnical and geo-environmental
investigations, ESE also performs or
interprets data from a variety of
geophysical methods. Geophysical l surveys
can extend one-dimensional borehole data
into two- and three-dimensional
depictions of the subsurface.
Geotechnical investigations can include
applied geophysical methods to directly
measure certain soil and rock
engineering properties, as well as
quantitatively evaluate site response in
seismically active regions.
Environmental investigations utilize
geophysical means to detect buried
objects, delineate contaminant migration
pathways, and map the lateral extent of
landfills and pits.
Geotechnical investigations can include
applied geophysical methods to directly
measure certain soil and rock
engineering properties, as well as
quantitatively evaluate site response in
seismically active regions.
ESE
provides geologic studies both as a part
of geotechnical engineering studies and
as individual or component geologic
investigations. Typical studies have
included assessments of rock units to
verify suitability of manufactured
slopes and identify excavation
characteristics; stability analyses and
erosion potential for natural slopes and
coastal bluffs; subsidence potential
evaluations; and studies to determine
the past, present, and probable future
occurrence of groundwater. The scope of
studies provided ranges from field
reconnaissance's to more complex
evaluations of geologic conditions using
multiple subsurface and remote sensing
techniques. These include drilled bore
holes, large, direct push exploration
methods, and geophysical methods.
Because most geophysical methods are
non-destructive and use small, portable
equipment, it is possible to collect
subsurface data in areas of difficult
terrain or at already-developed sites
that are not suitable for traditional
drill-and-sample methods. The selection
of the appropriate survey depends on the
physical characteristics of the site and
the type of data sought. ESE conducts
all exploration, testing, and monitoring
programs utilizing trained operators and
qualified professionals experienced in
the selected method.
UTILITY MAPPING
ESE specializes
in utility mapping projects. Utility
locators, construction professionals,
environmental firms and surveyors often
need a reliable way to non-destructively
locate subsurface targets prior to
digging, trenching, conducting site
assessments or mapping. We offer
services to covering the areas of gas
distribution/transmission, electric
distribution/transmission,
telecommunications, cable and
water/sewer.
ARCHAEOLOGICAL STUDIES
ESE
also specializes in geophysical surveys
for Cultural Resources Investigations.
Cultural Resources can be obscured by
vegetation, pavement, or overburden, and
therefore missed during conventional
pedestrian survey. We offer a solution
to this problem in an effort to avoid
costly delays during construction, when
“unanticipated discoveries” are often
made. There are also advantages in using
geophysics at the evaluation and data
recovery phases of site management.
ESE
uses a suite of geophysical instruments as
listed below:
Hydrographic Surveys
Terrestrial and Subaqueous
Cable/Pipeline Route Surveys
Cable/Pipeline As-Built and
Condition Surveys
Subaqueous Site Hazard
Assessments
Marine Positioning for
Construction and Seismic Exploration
Topographic and GIS Mapping
Tidal, Current, and Floodplain
Surveys/Studies
Bathymetric and Acoustic Data
Processing
Small Vessel and Marine
Positioning Support for Science Disciplines
Global Positioning System (GPS) and
Conventional
Control Surveys
ESE
provides geologic studies both as a part
of geotechnical engineering studies and
as individual or component geologic
investigations. Typical studies have
included assessments of rock units to
verify suitability of manufactured
slopes and identify excavation
characteristics; stability analyses and
erosion potential for natural slopes and
coastal bluffs; subsidence potential
evaluations; and studies to determine
the past, present, and probable future
occurrence of groundwater. The scope of
studies provided ranges from field
reconnaissance's to more complex
evaluations of geologic conditions using
multiple subsurface and remote sensing
techniques. These include drilled bore
holes, large, direct push exploration
methods, and geophysical methods
discussed below.
Ground Penetrating Radar
Electromagnetic Surveys
Downhole
Geophysical
Logging
Electromagnetic
Induction Profiling
Electrical Resistivity
Seismic Methods
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