TECHNICAL
SPECIFICATIONS
Format
No.
Effective
Date
SWL-ENGG-01F02R0
10-04-2015
TECHNICAL SPECIFICATION
FOR
GEOTECHNICAL INVESTIGATION
PROJECT:
DEVELOPMENT OF 200MW SOLAR POWER PLANT AT
KOM OMBO, ARAB REPUBLIC OF EGYPT
DOCUMENT NO.
SWLD-GEOTECHKOMOMBO
FOR INFORMATION
STATUS
DOCUMENT TITLE
SPECIFICATION FOR GEOTECHNICAL
INVESTIGATION
UDG
DKR
ATS
PRPD. BY
CHKD. BY
ISSUE AUTHORITY
Rev
Date:
0
03-04-2020
APPR.BY
TECHNICAL SPECIFICATION FOR
GEOTECHNICAL INVESTIGATION
INTRODUCTION
STERLING & WILSON (SW) has been selected as preferred an Engineering, Construction and
Procurement (EPC) for solar photovoltaic project in Kom-Ombo, Egypt.
SITE DESCRIPTION
The Project is located at Kom Ombo in Southern Egypt, approximately 600 km south of Cairo
and approximately 60 km north-west of Aswan in the Arab Republic of Egypt.
The following screenshot provides the area for the 200MW proposed plant:
PROJECT LOCATION
Doc No: SWLD-GEOTECH- KOMOMBO
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TECHNICAL SPECIFICATION FOR
GEOTECHNICAL INVESTIGATION
The project site area is approximately 3.94 km2. The coordinates for the proposed plant, as
marked in the layout above are:
Point
P1
P2
P3
P4
Latitude (N)
24.579639°
24.574500°
24.591306°
24.596250°
Longitude (E)
32.708833°
32.690083°
32.684167°
32.704167°
PROJECT APPRECIATION
The project involves the construction of Module Mounting Structure (Trackers) Area, Control
Room, Switchyard, Security room and Transformer, Inverter Station Area, Parking area,
internal road and trenches etc.
The main aim of the geotechnical investigation is to ascertain geotechnical parameters for the
construction of the proposed structure on the site. There will be heavy, medium and lightly
loaded (MMS) on the site.
The proposal of various structures are as per the table provided below:
SNo
1
2
3
Description of Structure
Module Mounting Structure (Tracker)
Control Room Building / Warehouse/
Security Room
Inverter Station
4
Fence / Gate
5
6
7
8
9
Transformer Foundation
Road
Drain
Erosion / Sediment control measure
Cable trenches
Type of Foundation
Rammed Steel/ Pre-drilled Steel
Isolated Concrete foundation
Grade Slab/ Isolated
Foundation/Block Foundation
Steel Post rammed
Pile/Concrete Pile
Concrete Pad with pit
Dirt/Gravel road
Earthen/ stone pitched
As per practice
Concrete Trenches
Note: Exact type of foundation will be selected based on local practice along with cost effective option
for the same.
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TECHNICAL SPECIFICATION FOR
GEOTECHNICAL INVESTIGATION
CODES AND STANDARDS
All field and laboratory tests, analysis and the recommendations for the foundation system
shall be made as per the provisions in the latest revisions of Local Egyptian practices and
applicable codes, Euro codes and American Codes and Standards.
The test essential for the type of the project are to be included along with the said requirement
in the specification.
TEST LOCATION PLAN
The preliminary plot plan of the area to be investigated with locations for boring/drilling is
furnished in drawing.
Field Tests
- Bore Hole
- Test Pits
- Dynamic cone penetration test/SPT
- Electro Resistivity Test
- Thermal Resistivity Test
- Plate Load Test
- California Bearing Ratio test
Note: All tests to be performed as per the table attached at the end of report (SCHEDULE OF
QUANTITY FOR GEOTECHNICAL INVESTIGATION).
REPORT
The report shall include:
-
Detailed bore logs, subsoil sections, field test results, laboratory observations and test
results in tabular as well as graphical form, practical and theoretical considerations for
interpretation of results, the supporting calculations for the conclusions drawn etc.
-
Geological information of the area such as geomorphology, geological structure,
stratigraphy and tectonic faults, seismicity of the region, core recovery and RQD etc.
-
Values of cohesion. Angle of internal friction, shear modulus and coefficient of subgrade reaction along with sample calculations shall be furnished. Calculation for
allowable bearing pressure and corresponding total settlements, and load capacity
calculation of piles (if recommended) shall be submitted.
-
Properties of soil for all strata.
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TECHNICAL SPECIFICATION FOR
GEOTECHNICAL INVESTIGATION
-
A plot plan in AutoCAD format showing the locations and reduced levels of all field
tests e.g. bore holes, trial pits, dynamic cone penetration tests, plate load tests etc.
-
A desktop study of local geology based on a review of publicly available information
including geological maps, water well records and satellite imagery along the test
results.
-
Visual and Engineering Classification of soil, Sieve analysis and Hydrometer analysis,
Liquid, Plastic, Shrinkage and Swell parameter, Specific gravity, Erosion Classification
of soil.
-
Moisture content, Porosity and density, Hardness, Slake durability of rock
-
Chemical composition of soil (Carbonate, Sulphates, Chlorides, Organic matter etc.)
-
pH value of Subsoil/ground water
-
Rate of steel corrosion of structural steel in contact with soil
RECOMMENDATIONS
Recommendations shall be made area wise duly considering the type of soil, structures
and foundation in the area. The recommendations shall include, but not limited to, the
following:
a)
Type of foundations to be adopted for various structures and equipment
considering total permissible and differential settlements, water table, width and
depth of foundation etc. The provision of relevant codes & standards shall be
followed.
b)
For shallow foundation the following shall be indicated with detailed supporting
calculations i)
Net safe allowable bearing pressure for isolated square footings
and continuous strip footings of sizes 1.0, 1.5 & 2.0m at different
foundation depth of 1.0, 1.5 & 2m below ground level considering both
shear failure and settlement criteria, giving reasons for the type of shear
failure adopted in the calculations.
ii) Total settlement criteria for different structures shall be considered
as per codes & standards.
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TECHNICAL SPECIFICATION FOR
GEOTECHNICAL INVESTIGATION
iii)
Modulus of sub-grade reaction, modulus of elasticity from plate
load test results along with Time Settlement curves and Load Settlement
curve.
iv)
If piling is envisaged, the type of pile with reasons, suitable
founding strata for the piles, estimated length and safe capacity for 300
mm dia & 350mm dia, shall be furnished. End bearing and skin friction
shall be indicated separately. Magnitude of skin friction, if any, and pile
spacing to be adopted in design shall be furnished. In case of socketing,
recommended length of socketing for each dia of pile, strata & type,
where socketing shall be done is to be recommended.
v) If Ramming is envisaged for module mounting structure
foundation, then recommendation for rammed/predrill foundation depth
should be provided.
c)
Electrical Resistivity of soil based on in-situ electrical resistance tests including
electrode spacing vs commutative resistivity curve.
d)
Suitability of the excavated soil for back filling purposes.
e)
Protective measures against aggressive chemical constituents (if found through
chemical analysis), sulphate and acidity in soil shall be detailed. Susceptibility
of soil to termite attack and remedial measures for the same.
f)
Susceptibility of sub soil to liquefaction in the event of earthquake. If so
recommendation for remedial measures.
g)
Any other information of significance like dewatering schemes which have a
bearing on the designs and constructions. Identification of any other potential
geotechnical problems and their remedial measures.
h)
Recommendation of Geo-physical properties of soil (features of textures, pore
size, characteristics of different soil layers, presence of impervious layers, voids
etc.)
i)
Additional Geotechnical Investigation beyond the scope of this work which, in
the opinion of the Sub-Contractor, are required to make conclusive assessment
on the soil parameters for the designs.
j)
Identification of corrective measures required for the improvement of sub
surface conditions such as removal of poor sub soil/ material, in-situ
densification etc. If ground improvement is recommended then its detailed
specification, specification for materials to be used, construction methodology,
equipment’s to be deployed etc. shall be furnished.
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TECHNICAL SPECIFICATION FOR
GEOTECHNICAL INVESTIGATION
k)
Calculation for possible negative skin friction/drag.
RATES AND MEASUREMENTS
Rates:
a)
Schedule of Quantities describes the work of Geotechnical Investigation under
various items. The item of work covered in the short description shall include all
operations as detailed in the technical specifications.
b)
No claim shall be entertained if the details, shown in the drawings (e.g. location,
depth for tests and number of tests etc.) vary during execution of the works.
c)
The unit rates quoted shall include minor details which are obviously and fairly
intended, and which may not have been included in these documents but are
essential for the satisfactory completion of the work.
d)
The bidder’s rates shall be inclusive of providing all equipment, men , material,
skilled and unskilled labor, making observations, establishing ground levels and
co-ordinates at location of each hole, test pit etc. by carrying levels and
distances from bench mark pillars and grid lines given by the Contractor.
e)
The quoted rates for pits/plate load test shall be inclusive of dewatering and
backfilling.
g)
The rates quoted for laboratory tests shall include preparation of samples,
performing tests, recording and analysis of data and submission of one set of
above information, every week for review by the Contractor.
h)
Quantities of work indicated in this schedule are only approximate. No claim
(other than item rate charges) will be entertained by the Contractor if the actual
quantities differ from those indicated in the Schedule of Quantities. The Owner
(here SW) reserves the right to modify the scope of work in each area to be
surveyed at any time during work.
i)
Rates and amounts shall be written in ink and shall be entered both in figures
and words. In case of any discrepancy between the figures and words, the latter
shall govern. All corrections shall be initialed by the bidder. In case of any
mistake in computation of amount from rate and quantity, the same shall be
corrected with the value arrived at by multiplying the quantity with the correct
rate.
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TECHNICAL SPECIFICATION FOR
GEOTECHNICAL INVESTIGATION
j)
Rates shall be firm for ±25% variation in the total Contract Price with the
provision that quantity of individual items may vary to any extent.
k)
Unit rates and prices shall be quoted/ submitted for all items listed in the
schedule of quantities. If unit rates and/or prices are not quoted against any
item, it shall be deemed to have been covered in the rates and prices quoted
elsewhere and accordingly the item rate will be taken as NIL.
l)
Rates quoted shall include the supply of all documents, drawings, maps,
computer diskettes, and etc. all as per bid documents. The rates shall also be
inclusive of the cost of power, water, cutting of vegetation, transportation of men
and equipment, boarding and lodging of personnel, stationary, wages of
temporary and permanent personnel and any other incidentals required for
completion of the work.
m)
The Contractor reserves the right to split the contract. However, the rates and
prices shall remain valid.
n)
The total amount quoted shall be valid for a period of 6 (six) months from the
date of receipt of bids. Also, no escalation of rates shall be permitted during the
work.
Measurements:
a)
All measurements shall be in SI Units.
b)
Length shall be measured in meters (m), correct to two decimal places. Areas
shall be worked out in Square meters (Sq.m) and volume in Cubic meters
(Cu.m), rounded off to two decimal places.
c)
Bore holes and trial pits, in which more than one tests are conducted, shall be
measured only once.
d)
The depth of penetration due to DPT at the bottom of bore hole shall not be
considered for the measurement of borehole depth.
e)
Boring in rock with diamond bit shall be measured in length in meters (m)
correct to two decimal places for the actual core length.
COMPLETION TIME
Work shall be completed in all respects within 20 days from the date of receipt of letter
of intent including mobilization, field work, furnishing of all drawings and final reports.
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TECHNICAL SPECIFICATION FOR
GEOTECHNICAL INVESTIGATION
The draft report shall be submitted before 1 weeks from start date of work and final
report shall be submitted before 3 weeks from start date of work.
SCHEDULE OF QUANTITY FOR GEOTECHNICAL INVESTIGATION
Sl.
No.
ITEM DESCRIPTION
1
Mobilization of plant, men, equipment and materials for
Geotechnical Investigation and Demobilization on
completion of work.
2
2a
i
ii
2b
i
ii
Setting up boring rigs at each borehole locations
including clearing and removing of all vegetation,
obstructions, bushes, shrubs etc., and
Making Bore Holes as per Technical Specifications at
various locations in all types of soil, performing Dynamic
Penetration Tests as per specifications, collection of soil
and water samples complete including storing,
transporting of sample to laboratory, back-filling of
boreholes all complete as per specifications and as
directed by the Engineer in charge in charge.
a) From natural ground level to 5 m.
b) Installation of Piezometer (Casagrendeo Type) in bore
hole as per the specification to measure ground water
level upto 10 m depth from NGL.
Core drilling in rock strata using double tube core barrel
using Nx size diamond bit and collection of rock cores
and water samples, keeping record of core recovery,
RQD, 2b. conducting SPT if core recovery is less than
20%, keeping cores in wooden samples including storing,
transportation of samples to laboratory, backfilling of
bore holes all complete as per specifications and as per
the direction of Engineer in charge in charge.(If
Required)
From 0 to 1 m within rock
Same as item 2b(a) but any depth above 1 m to 5 m
Doc No: SWLD-GEOTECH- KOMOMBO
RM – Per meter run
LS – Lump sum
Unit
Unit
Price
Quantity
(in CLP)
LS
1.00
NOS
100
MTR
500.00
NOS
MTR
MTR
Amount
(in CLP)
5
20.00
30.00
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TECHNICAL SPECIFICATION FOR
GEOTECHNICAL INVESTIGATION
3
4
a
5
6
a
b
7
a
b
c
d
e
f
g
Making Trial Pits of specified size (0.6 m x 2.0m) at
various location upto 3.0 m depth in all type of soil and
weathered rock which can be excavated by using
mechanical means, including sheeting or shoring the
sides for the purpose of stability dewatering and
maintaining the pit dry at all times, collecting
disturbed/undisturbed samples at 1.0 m interval,
backfilling of the pits all complete as per the
specification and direction of the Engineer in charge in
charge.
Plate Load tests at various trial pit locations including
providing and erecting equipment, supporting beams,
jacks and instruments and removing same and clearing
site after test all complete as per specification and
direction of Engineer in charge in charge.
Ordinary Plate Load Test (60 cm X 60 cm)
Laboratory CBR Test at various locations all complete as
per specification, layout and direction of Engineer in
charge in charge. The test is to be done after area
grading.
Electrical Resistivity Test (ERT) & Thermal Resistivity Test
(TRT) all complete as per specification, layout and
direction of Engineer in charge in charge.
ERT
TRT
Conducting various Laboratory Tests on soil samples at
an approved laboratory including preparation of soil
sample to determine the following propertiesBulk Density
Moisture Content
Particle size analysis incl. sieve/hydrometer Analysis
Liquid Limit, Plastic Limit, Shrinkage Limit and plasticity
index.
Specific Gravity
Swell Pressure & Free soil Index determination
Relative density (for sand)
Doc No: SWLD-GEOTECH- KOMOMBO
NOS
40
NOS
40
NOS
25
NOS
NOS
50
50
NOS
NOS
NOS
80
80
80
NOS
80
NOS
NOS
NOS
80
80
80
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TECHNICAL SPECIFICATION FOR
GEOTECHNICAL INVESTIGATION
8
Chemical Test on subsoil & Water samples for
Carbonate, Sulphate, Chloride, pH value, organic matter,
and turbidity complete as per specification.
a
Sulphate
NOS
80
b
Carbonate
NOS
80
c
Organic matter
NOS
80
d
e
Chloride
pH (as per ASTM D4972/95)
NOS
NOS
80
80
NOS
NOS
NOS
50
50
50
50
9
a
b
c
d
e
f
Laboratory Test on rock samples as per specification for
determining the following properties - if rock is
encountered
Moisture Content, Porosity and Density
Specific Gravity
Hardness
Unconfined Comressive Strength (both saturated and insitu water content)
Point Load Strenght Index
Deformability Test (both Saturated and dry samples)
NOS
NOS
NOS
50
50
10
Taking photographs of rock samples of rock cores, rock
exposures, geological features, pits all complete to cover
field testing.
SET
1
11
Submitting Report (in PDF) with all field and laboratory
test records, graphs, charts, recommendations complete
as specified
LS
1
Doc No: SWLD-GEOTECH- KOMOMBO
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