2. Abstract
Assessing the suitability of a site, for
waste disposal is extremely important to
ensure that safe and environmentally
friendly landfill sites are chosen
The roles that engineering geology,
geotechnical investigations and
geophysical methods play in this
assessment were highlighted.
Geotechnical investigations also play a
role as they provide data on soil and rock
characteristics, which guide the design
and stability of the landfill
3. Introduction
It is inevitable that the chemical and biological
contaminants in wastes will find their way back to
humans to affect health, quality of life, and working
activities
The aim of designing a landfill is to make available a
facility that will provide a reasonable degree of safety
to humans and the environment during its
operational as well as its post-closure life
Therefore, in designing a waste disposal site, the
topography, hydrology, hydrogeology, and geology of
the area are considered essential pieces of
information
4. Introduction
• Engineering geology employs
methods such as aerial
photographs and satellite
imageries which serve as useful
guides to identifying geological
and hydrogeological features and
so reveal areas on which landfill
sites might be located
This Photo by Unknown author is licensed under CC BY-SA.
5. Objectives
To raise awareness among the public
about the importance of protecting the
environment from the harmful effects of
indiscriminate waste disposal
To emphasize the involvement of
appropriate professionals in the
construction of safe waste disposal
facilities
To provide adequate planning and
investigative information on waste
management techniques, particularly in
developing countries
6. The Role of Engineering Geology in
Planned Waste Disposal Programs
"Engineering geology is a branch of human knowledge
that uses geological information combined with practice
and experience to assist in the solution of problems in
which such knowledge may be applicable"
Prior to the design and construction of a waste disposal
site, geomorphological, geological, subsurface, and soil
characteristics of the site must be investigated to ensure
the best siting, stability of the facility, and to minimize the
effects of the sites both in the short and long term
7. Significance Of Engineering Geology In
Planned Waste Disposal Programmes
ENGINEERING GEOLOGY, A MULTIDISCIPLINARY FIELD THAT
COMBINES GEOLOGICAL KNOWLEDGE WITH PRACTICAL
EXPERTISE, PLAYS A PIVOTAL ROLE IN THE ASSESSMENT
AND DEVELOPMENT OF WASTE DISPOSAL SITES
ITS SIGNIFICANCE LIES IN ENSURING THE LONG-
TERM SAFETY AND ENVIRONMENTAL
SUSTAINABILITY OF WASTE DISPOSAL FACILITIES
8. Geotechnical
Investigations: Ensuring
Safe Site Selection
GEOTECHNICAL INVESTIGATIONS INVOLVE DRILLING
BOREHOLES AND EXTRACTING SOIL AND ROCK SAMPLES
FOR LABORATORY TESTING. THESE TESTS ASSESS CRUCIAL
GEOTECHNICAL PROPERTIES SUCH AS SHEAR STRENGTH,
CONSOLIDATION CHARACTERISTICS, ELASTIC MODULUS,
AND SWELLING POTENTIAL, PROVIDING VALUABLE DATA
FOR LANDFILL DESIGN AND STABILITY ANALYSIS.
This Photo by Unknown author is licensed under CC BY.
9. Advancing Site Suitability
Assessment with Aerial
Imagery and Remote Sensing
In the digital era,
engineering geologists
leverage the power of
aerial photographs and
satellite imagery to
augment traditional site
selection methods
Aerial imagery offers a
bird's-eye view, enabling
a rapid assessment of
potential sites and
preliminary mapping of
landforms
Satellite imagery, as part
of remote sensing
technologies, provides a
wealth of additional
information
This Photo by Unknown author is licensed under CC BY-SA-NC.
10. Incorporating Community and
Environmental Considerations: A
Holistic Approach
While engineering
geology forms the
foundation of waste
disposal site selection,
a comprehensive
approach must also
incorporate
community and
environmental
considerations
Engaging with local
communities and
stakeholders is
paramount to
understand their
concerns and address
any social impacts of
the proposed waste
disposal facility
Environmental impact
assessments play a
pivotal role in
evaluating the
potential effects of
waste disposal sites on
the surrounding
ecosystem
This Photo by Unknown author is licensed under CC BY-ND.
11. Geophysical Investigations:
Unveiling the Subsurface Secrets
Geophysical investigations
are a crucial component of
waste disposal site
assessment, employing a
diverse array of surface and
downhole measurement
techniques to explore the
subsurface geologic and
hydrogeologic conditions
These methods offer
practical advantages as they
provide extensive ground
coverage in a relatively
short timeframe
Geophysical investigations
serve dual purposes, as they
are applied both before
waste disposal operations
to assess site characteristics
and during waste disposal
to monitor potential
leachate flow
12. A Multitude of Geophysical
Sensing Methods
Seismic Surveys: Seismic waves are propagated
into the subsurface, and their reflections are
used to determine the depth to competent
bedrock, as well as the presence of subsurface
layers and their characteristics, such as topsoil,
weathered layers, and fresh bedrock
Electrical Resistivity Surveys: Electrical resistivity
measurements aid in understanding the nature
of the subsurface materials, including
groundwater resources and the aquifer's
characteristics
Ground-Penetrating Radar : GPR uses radar
pulses to map subsurface features, including
buried structures and layers
13. A Multitude of Geophysical
Sensing Methods
Electromagnetic Methods: EM methods are
valuable in assessing subsurface conductivity,
which can help identify potential aquifers and
delineate boundaries between different
geological formations
Magnetic Surveys: Magnetic surveys are useful
in detecting subsurface variations in
magnetization, aiding in identifying geological
structures such as faults and shear zones
14. Integration for Better Insights
For a comprehensive evaluation of a
given site, integrating multiple
geophysical methods is often
employed
The combined use of seismic surveys,
electrical resistivity, GPR, EM
methods, and magnetic surveys
enhances the understanding of the
subsurface conditions, providing a
more detailed and accurate depiction
of the site's geology and
hydrogeology
Boreholes provide geotechnical
confirmation of the subsurface
conditions, enhancing the overall
confidence in the site assessment
15. Revealing Subsurface
Information
GEOPHYSICAL METHODS FURNISH
ESSENTIAL INFORMATION ABOUT THE
SUBSURFACE, AIDING IN MAKING
INFORMED DECISIONS REGARDING WASTE
DISPOSAL SITE SELECTION AND
MANAGEMENT
THE DATA OBTAINED INCLUDES:
SUBSURFACE LAYERS AND
CHARACTERISTICS: UNDERSTANDING THE
STRATIGRAPHY AND COMPOSITION OF
SUBSURFACE LAYERS, SUCH AS TOPSOIL,
WEATHERED LAYERS, AND FRESH
BEDROCK, ASSISTS IN DESIGNING
APPROPRIATE LANDFILL STRUCTURES
DEPTH TO COMPETENT BEDROCK:
DETERMINING THE DEPTH TO COMPETENT
BEDROCK IS CRITICAL FOR ASSESSING THE
SITE'S OVERALL STABILITY AND POTENTIAL
FOR WASTE CONTAINMENT
16. Geotechnical Investigations:
Unveiling the Subsurface Secrets
The satisfactory design and construction of
any engineering structure hinge upon a
thorough understanding of the soil or rock
characteristics underlying the site
To obtain this critical knowledge, extensive
geotechnical investigations are conducted,
both in-situ and in the laboratory
17. A Comprehensive Approach
for Landfill Design
The integration of in-situ geotechnical
investigations and laboratory testing allows
engineers to develop a comprehensive
understanding of the subsurface conditions
This knowledge forms the foundation for
making informed decisions in landfill site
selection, designing landfill structures, and
ensuring the long-term stability and
environmental safety of waste disposal facilities
18. SITE CONSTRUCTION: Building the
Foundation for Safe Waste Disposal
SITE CONSTRUCTION PLAYS A PIVOTAL ROLE IN
WASTE MANAGEMENT, PARTICULARLY IN
SAFEGUARDING THE ENVIRONMENT AND PUBLIC
HEALTH
PROPER SITE CONSTRUCTION STARTS WITH
CLEARING AND PREPARING THE AREA, WHICH
ALLOWS FOR EFFICIENT WASTE CONTAINMENT
WHILE MINIMIZING THE RISK OF CONTAMINATION
THE INSTALLATION OF IMPERMEABLE LINERS AND
BARRIERS IS OF PARAMOUNT IMPORTANCE IN
PREVENTING LEACHATE, A HARMFUL LIQUID
PRODUCED FROM WASTE DECOMPOSITION, FROM
SEEPING INTO THE SOIL AND GROUNDWATER
This Photo by Unknown author is licensed under CC
BY.
19. SITE MANAGEMENT:
Safeguarding Operations and
Environmental Compliance
Effective site management is essential to
ensure that waste disposal facilities operate
in an environmentally responsible manner
Continuous monitoring of key parameters
such as leachate levels, gas emissions, and
groundwater quality is vital in identifying
and addressing potential issues promptly
Compliance ensures that waste disposal
activities meet strict standards, preventing
adverse impacts on ecosystems, nearby
communities, and natural resources
20. SITE RESTORATION: Reclaiming
the Land for Future Use
THE PROCESS OF SITE RESTORATION IS CRUCIAL IN
RECLAIMING THE LAND AND MITIGATING THE
ENVIRONMENTAL LEGACY OF WASTE DISPOSAL
FACILITIES
POST-CLOSURE CARE ENSURES THAT THE SITE
CONTINUES TO BE MONITORED AND MAINTAINED,
EVEN AFTER WASTE DEPOSITION HAS CEASED
ONE OF THE MOST SIGNIFICANT BENEFITS OF SITE
RESTORATION IS THE OPPORTUNITY TO REPURPOSE
THE LAND FOR FUTURE USE
21. Conclusion
The site suitability assessment for waste disposal
facilities is a crucial and complex process that
involves various disciplines, including
engineering geology, geotechnical investigations,
and geophysical methods
Engineering geology, aided by aerial photographs
and satellite imagery, guides site selection by
identifying geological and hydrogeological
features
Geotechnical investigations offer essential data
on soil and rock characteristics, guiding landfill
design and stability
