1. Scope of Work
1.1. General
The scope of work detailed below is drafted based on the review of the scope of work and
associated document received in the email cited above. The scope is further tailored based
on experience with this specific project and multiple similar projects to fulfill request to
optimize the study scope and outcomes. This may necessitate proposing an alternative
approach or methodology or improvement to the current scope to:
a) Evaluate the integrity of its current/existing condition.
b) Assess its stability for future raises of the red mud storage facility.
1.2. Specific Scope of Work
The specific scope of work consists of the following:
(a) Gather the requirements from project team, including the red mud
characteristics and disposal rates and the relevant documents and standards.
(b) Once the available information and documents are retrieved, a site visit will be made
to get exposure to the current site/field conditions and compare it with the
documented information.
(c) Perform/conduct a level survey to obtain the elevations and dimensions of cell 1 and
cell 2 rises as well as the embankment crust and slopes. This will help assessing the
analysis and trying to evaluate the original embankment levels and comparing such
levels and positions to the values before having the additional storage if such data is
available.
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MAC Red Mud Stability, 6-2024, Rev.1
Page 2 of 8
(d) Review all necessary data including material characteristics, the geotechnical
investigation reports (GIR), and the previous assessment reports.
(e) Perform geotechnical in situ and laboratory testing to determine the properties of
existing soil/red-mud; such data is necessary for the stability analysis of the uplifted
portions and the future rises.
(f) Perform the 3D or 2D finite element analysis (FEA) of the current embankments, for
static and seismic stability of the current raised embankments. The analysis will
include both the newly raised embankments and the original embankment walls.
(g) Submission of an assessment report with conclusions and recommendations on the
status of the red mud disposal facility (Cells 1 and 2) and recommendations of the
future raising of the red mud disposal facility. An initial draft report will be
submitted for evaluation and review by ; such report will be submitted finally once
the feedback from is received and incorporated. The report will include both the
short-term and the long-term stability of the embankment walls and its suitability
for future raises.
1.3. Optional Scope
Maeen is recommending the following additional scope:
(a) Install permanent bench marks BM around/on the original embankment to monitor
the embankment lateral and vertical movement with time and red mud raising levels
for the remaining embankment life.
(b) Monitor the movement (lateral and vertical) periodically.
2. Cost
2.1.Main and Optional Items
The cost of the geotechnical consulting services required for each of the above categories is
as follows:
Sr.
a
b
Description
Measuring
Qty.
Units
Main Scope
Mobilization and demobilization
Gather the requirements from / project team,
including the red mud characteristics and
disposal rates and the relevant documents and
standards.
July 17, 2024
MAC Red Mud Stability, 6-2024, Rev.1
LS
1
LS
1
Cost
(SAR)
Page 3 of 8
Sr.
c
d
e
f
g
h
Description
Measuring
Qty.
Units
Main Scope
Once the available information and documents are
retrieved, a site visit will be made to get exposure
to the current site/field conditions and compare it
with the documented information.
Perform/conduct a level survey to obtain the
elevations and dimensions of cell 1 and cell 2 rises
as well as the embankment crust and slopes. This
will help assessing the analysis and trying to
evaluate the original embankment levels and
comparing such levels and positions to the values
before having the additional storage, assuming
such data is available.
Review all necessary data including material
characteristics, the geotechnical investigation
reports (GIR) and the previous assessment
reports. The review will include the extraction of
the material parameters necessary for the stability
numerical analysis.
Perform geotechnical in situ DCP (30 Tests),
Making pits and sampling up to 2m depth (6 pits)
and laboratory testing (40 samples) to determine
the properties of existing red mud; such data is
necessary for the stability analysis of the uplifted
portions. Details will be provided once the PO is
issued. Testing will focus on physical properties
such as gradation, compaction and plasticity. No
chemical testing is anticipated/included at this
stage.
Perform the 3D or 2D finite element analysis
(FEA) of the current embankments, for static and
seismic stability of the current raised
embankments. The analysis will include both the
newly raised embankments and the original
embankment walls. This will include the
increments up to 20m uplifting, in stages.
Detailed methodology will be planned once the
PO or LOI is received.
Preliminary and final report writing with findings,
conclusions and practical recommendations with
one Presentation
July 17, 2024
MAC Red Mud Stability, 6-2024, Rev.1
LS
1
LS
1
LS
1
LS
1
LS
1
LS
1
Cost
(SAR)
Page 4 of 8
Sr.
Measuring
Qty.
Units
Description
Main Scope
Total Cost of Original Scope SAR)
Additional and Optional Scope Items
i
j
LS for
Borehole or CPT if needed; 15~20 tests would be
targeted. Additional Scope, when needed.
15~20 test
Supplying and installing Bench Marks at edges
and toes of the original slopes; 15~20 BS would
LS for
be targeted. Optional Scope if approved by 15~20 BMs
MAC.
1
1
Cost
(SAR)