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GEOTECHNICAL INVESTIGATION
FOR B+G+1 STOREY VILLA
FOR MR. ABDUL RAUF MOHAMMAD ISHAQ
AT PLOT NO. RN. 036, DUBAI LANDDUBAI
UNITED ARAB EMIRATES
(GSI/0113/12/DXB M/S. EMSQUARE ENGINEERING CONSULTANT)
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GEOTECHNICAL INVESTIGATION
FOR B+G+1 STOREY VILLA
FOR MR. ABDUL RAUF MOHAMMAD ISHAQ
AT PLOT NO. RN. 036, DUBAI LAND
DUBAI
UNITED ARAB EMIRATES
REPORT: GSI/0113/12/DXB 26 th AUGUST 2012
REPORT ISSUE STATUS
26-Aug-12 Final Engineering Report SWR NA IK
Issue Date Descript ion Prepared Checked Approved
EMSQUARE ENGINEERING CONSULTANT MATERIAL LAB DUBAI
P.O. BOX 181903 P.O. BOX
114717
DUBAI DUBAI
UNITED ARAB EMIRATES UNITED ARAB EMIRATES
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M/s. Emsquare Engineering Consultant
P.O. Box No. 181903
Dubai, U.A.E.
Ref: GSI/ 0113/12/DXB August 26, 2012
For the Attention of Eng. Mustafa/ Mr. Kishore
Dear Sir,
GEOTECHNICAL INVESTIGATIONFOR B+G+1 STOREY VILLA
FOR MR. ABDUL RAUF MOHAMMAD ISHAQ
AT PLOT NO. RN. 036, DUBAI LAND
DUBAI
UNITED ARAB EMIRATES
We have pleasure in enclosing herewith four copies of our final engineering report, together with
invoice for carrying out the work on the above project. Should you have any queries with regard to our
report, please do not hesitate to contact us.
Please note that soil/ rock samples related to this project will be retained at our storage facility for 1
calendar month, without charge, from the date of this final report, before disposal. Should you wish to
extend the storage period, please contact us before the intended disposal date.
We are pleased to have been of service on this occasion, and look forward to further co-operation on
future projects.
Yours faithfully,
MATERIAL LAB DUBAI
________________________Eng. Naseem AnwarDeputy Geotechnical Manager
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GEOTECHNICAL INVESTIGATION
FOR B+G+1 STOREY VILLA
FOR MR. ABDUL RAUF MOHAMMAD ISHAQ
AT PLOT NO. RN. 036, DUBAI LAND
DUBAI
UNITED ARAB EMIRATES
CONTENTS PAGE
SUMMARY (i)
1.0 INTRODUCTION 1
2.0 SITE DESCRIPTION 1
3.0 LOCAL GEOLOGY 1
4.0 FIELD WORK 2
5.0 LABORATORY TESTING 4
6.0 SUBSURFACE CONDITIONS 5
7.0 ENGINEERING DISCUSSION & RECOMMENDATIONS 6
8.0 REPORT LIMITATIONS 10
PLATES
PLATE 1 LOCATION PLAN
PLATE 2 SITE PLANPLATE 3 SPT VALUES VS DEPTH
APPENDICES
APPENDIX A FIELD RESULTS
APPENDIX B LABORATORY TEST RESULTS
APPENDIX C APPENDICES TO SITE INVESTIGATION REPORTS
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SUMMARY
A geotechnical investigation, comprising two (2) boreholes and supplementary field testing, was
performed as instructed by M/s Emsquare Engineering Consultants at Plot No. RN. 036, Dubai, United
Arab Emirates for the proposed construction of B+G+1 Storey Villa. Fieldwork for the investigation was
undertaken on 22 nd & 23 rd August 2012. A subsequent programme of laboratory testing was performed
on representative soil samples recovered from the site.
The observed sub-surface conditions are such that relatively high load bearing soils are present below
the influence zone of the formation level. Accordingly, an allowable bearing pressure for shallow
foundation and basement raft type of foundations and net allowable bearing pressures have been given
with corresponding estimated orders of settlement for a rigid raft foundation at the formation level of
approximately 3.5m below existing ground level.
In addition recommendations have also been given to assist in the earthworks required to form the
basement and Earth Pressure coefficients have also been given to assist in the design of retaining walls
for the basement structures.
The corrosive potential of the soil and groundwater has also been considered with respect to appropriate
concrete mix design recommendations.
As ground water level was not encountered up to the termination depth of boreholes.
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1.0 INTRODUCTION
Material Lab (MLAB) was commissioned by M/s. Emsquare Engineering Consultant to perform a
geotechnical site investigation, and provide geotechnical consulting services for the proposed
construction of ground plus one storey villa building, underlain by one level of basement (B+G+1), for Mr.
Abdul Raauf Mohammad Ishaq at Plot No. RN. 036, Dubai Land, Dubai, United Arab Emirates. The
investigation has been based on a MLAB proposal (ref. Q-NA/G/0168/12) dated on 10 th June 2012 and
subsequent approval by the client on same date. The work has been performed in general accordance
with the British Standards BS 5930: 1999 Code of practice for site investigations.
A total of two (2) boreholes to 12.0m depth were drilled on the site for the proposed structure. The site
location is indicated on the location plan, Plate 1. Field test locations, relative to the proposed site layout,
and existing site features, are indicated on the site plan, Plate 2. Fieldwork for the investigation was
performed between 22 nd and 23 rd August 2012. The factual field and laboratory data, together with
appropriate engineering interpretation and discussion of results, are presented herein.
2.0 SITE DESCRIPTION
The site is located at Plot No. RN. 036, Dubai Land, Dubai, United Arab Emirates. The surface of the plot
was approximately level and was undeveloped at the time of soil investigation.
3.0 REGIONAL AND LOCAL GEOLOGY
The geology of the United Arab Emirates, and the Arabian Gulf area, has been substantially influenced
by the deposition of marine sediments associated with numerous sea level changes during relatively
recent geological time. With the exception of mountainous regions shared with Oman in the north- east,
the country is relatively low-lying, with near surface geology dominated by Quaternary to late Pleistocene
age, mobile aeolian dune sands, and sabkha/ evaporite deposits.
The geologically stable Arabian Plate is separated from the unstable Iranian Fold Belt by the Arabian
Gulf. It is believed that a tilting of the entire Arabian Plate occurred during the early Permian period,resulting in uplift in southern Yemen, and depression to the north- east. Crustal deformations and
igneous intrusions occurred in the north- east as a result of this movement. Subsequent tectonic
movements, peripheral to the folding of the Iranian Zagros Range, during the Plio-Pleistocene epoch,
probably contributed to the formation of both the Arabian Gulf depression, and the mountainous regions
shared by the United Arab Emirates and Oman in the north- east.
The near surface geology of the Dubai region is dominated by aeolian dune sand deposits of Holocene
to Pleistocene age. These deposits typically comprise fine grained silty calcareous sand, which is
commonly dense and variably cemented beneath a shallow, loose, normally consolidated mobile layer.
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Although variable, the degree of cementation generally increases with depth, such that the variably
cemented sand grades to predominantly calcareous sandstone. Very silty, gypsiferous sabkha and
evaporite layers occur occasionally within the aeolian sand deposits.
Although surficial sabkha deposits are found throughout the coastal belt of the Arabian Gulf, and far
inland in the western and southern parts of the United Arab Emirates, they are not particularly common in
the Dubai region. Sabkha is an Arabic name used to describe relatively fine grained, hypersaline, silt
and sand deposits, which are commonly saturated with brine, and salt encrusted. These deposits form in
natural evaporation pans where saline water, introduced by sea invasion or elevated saline groundwater,
is able to accumulate at or near ground surface level, assisted by capillary action .
4.0 FIELD WORK
A programme of subsurface investigation performed at the site between 22 nd and 23 rd August 2012,
included the following:
Total of two (2) Exploratory boreholes to the depth of 12m with:
Regular split-spoon sampling during Standard Penetration Tests (SPTs) in soils
Disturbed bulk soil sample from cable percussion drill cuttings
All of the investigation works were performed by experienced geotechnical personnel under the regular
supervision of an experienced geotechnical engineer. The works were performed in general accordancewith the British Standard BS 5930: Code of practice for site investigations.
Borehole locations are indicated on Site Plan Plate 2 relative to the proposed site layout and existing
features. Field test results and observations are presented in Appendix A. The presentation of field
results is preceded by summarised explanations of borehole log symbols and classification systems, and
a summary of soil and rock strength definitions, on Plates A1.1 to A1.3, and A2 respectively.
4.1 Exploratory Boreholes
A total of two (2) boreholes were drilled on the site to depths of 12.0m beneath existing ground level.
Drilling was performed using a trailer mounted Pilcon Wayfarer cable percussion drilling rigs. The
boreholes were advanced through soil deposits, including variably cemented sands, using cable
percussive equipments and techniques.
The borehole locations were set out by our surveyor/ engineer in accordance with the instructions of the
Clients Representative and are shown on the site plan presented as Plate 2.
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Standard Penetration Tests (SPTs) were conducted at regular intervals within the soil layers in order to
estimate the relative densities and obtain samples for classification purposes. Test intervals were 0.5m to
a depth of 2.5m and there after 1.0m to the termination depth of 15.0m below existing ground level.SPTs were conducted in accordance with the relevant British Standard (BS 1377- Part 9); Methods of
test for soils for civil engineering purposes. The test involves driving a 50mm external diameter thick
walled split spoon sampler into the bottom of the borehole with successive blows of a 63.5kg hammer
falling freely through 760mm. The sampler is driven through 6 intervals of 75mm and the number of
blows required to penetrate each interval is recorded. The initial 150mm interval is intended to ensure
seating of the sampler such that it penetrates beyond the zone of influence of any soil disturbance at
the base of the borehole. The aggregate number of blows to drive the sampler over the final 300mm is
termed the N value, and is considered indicative of the in-situ relative soil density.
In very dense and/or cemented soil layers it is often not possible to ensure complete penetration of the
SPT sampler, due to driving refusal, or the risk of damage to sampling equipment as a result of hard
driving. The practical driving limit is of the order of 50 blows for the final 300mm penetration. Where
driving resistance exceeds this limit, SPTs are usually terminated with incomplete penetration. In such
cases the total 50 blows for cemented soil and 100 blows for very weak to weak sandstone driven
against the actual penetration depth is recorded on the borehole logs. A plot of SPT versus Depths is
presented in Plate 3.
Disturbed SPT and bulk soil samples collected during drilling were retained in sealed, labelled plastic jars.
All samples were transported to the Material Lab Dubai Branch sample processing and storage facility
for detailed logging and sample processing. Representative samples were selected for laboratory testing
to assist with sample descriptions and determination of engineering material properties. Individual
borehole logs are presented in Appendix A, Plates A3.1.1 to A3.2.2.
Ground water was not encountered up to the termination depth of boreholes.
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5.0 LABORATORY TESTING
A programme of laboratory testing was performed on selected samples of soil and groundwater obtained
during the fieldwork. Test results have been used to assist with classifications, and determinations of
relevant physical and mechanical properties of soil and rock samples. Chemical test results have been
used to determine the corrosivity of soil and groundwater. In general, laboratory testing has been
performed in accordance with ASTM and British Standard procedures.
Laboratory test results are presented in Appendix B.
5.1 Particle Size Distribution
The particle size distribution was determined for a total of two (2) soil samples in accordance with the wetsieving method described in BS 1377: Part 2. Compliance with the Standard, with respect to minimum
sample quantity is dependent on the maximum significant grain size and the method of sampling.
In particular, for SPT samples, the quantity of soil available for testing is typically about 100g. This
sample quantity is considered representative where grain sizes range up to 2mm (i.e. to coarse sand
size). Where significant quantities of coarser particles are present, the particle size distribution obtained
from SPT samples should be regarded as indicative only. It is particularly important to recognize the
limitations of SPT samples where medium to coarse grained gravels and/or cobbles are present.
The test results are presented as particle size distribution curves on Plates B1.1.
5.2 Chemical Analysi s
Chemical analyses were performed on one (1) soil sample to determine sulphate content, chloride
content, and pH levels. These analyses were performed in accordance with the BS 1377: Part 3 methods
for testing acid soluble sulphate (expressed as percentage of sulphur trioxide) and chloride contents.
The chemical test results are summarised on Plate B2.1
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6.0 SUBSURFACE CONDITIONS
The subsurface strata encountered during drilling are given on the Borehole Logs in Appendix A, Plates
A3.1.1 to A3.2.2. The borehole observations and test results indicate relatively consistent subsurface
conditions over the site.
The boreholes revealed medium dense, brown, slightly silty to silty, fine to medium SAND up to 1.0m depth
followed by medium dense, brown, silty, fine to medium SAND up to 3.5m depth below existing ground level.
Below this material very dense, light reddish brown, slightly silty, fine to medium SAND with occasional fine to
medium gravels up to 8.50m depth below existing ground level. Underlain by this material consists of very
dense, reddish brown, slightly silty, fine to medium, slightly to moderately gypsiferous SAND with some
slightly to moderately cemented sand/ sandstone fragments and rare fine to medium gravels to the
termination depth of boreholes at 12.0m depth below existing ground level.
The design subsurface profile summarised below in Table 1 is recommended for foundation design
purposes. For more detailed, location specific descriptions, reference should be made to the borehole
logs presented in Appendix A.
Table 1 :- Recommended Design Subsurface Profile
Range
(Below OGL) Material Description
GL to 1.0m Light brown, silty, fine SAND.
1.0m to 3.5m Medium dense, brown, slightly silty, fine to medium SAND.
3.5m to 8.50m Very dense, light reddish brown, slightly silty, fine to medium SAND with some
fine to medium gravels.
8.50m to 12.0 Very dense, light reddish brown, slightly silty, fine to medium,slightly gypsiferous
SAND with some slightly to moderately cemented sand/ very weak sandstone
pieces and rare fine to medium gravels.
During the period of site works groundwater level was not encountered up to the termination depth of
borehole.
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7.0 ENGINEERING DISCUSSION AND RECOMMENDATIONS
The purpose of the investigation was to evaluate the subsurface conditions with respect to the design of
foundations for the proposed development. It is understood from the information provided by the client
that it is proposed to construct ground plus one storey villa, underlain by one level of basement (B+G+1)
on this site. It is further understood that the basement floor level is to be founded at a depth of
approximately 3.5m below existing ground level. However, at the time of writing this report detailed
information regarding foundation layout or loadings had not been made available so that only a general
discussion can be undertaken.
The observed subsurface conditions are such that moderate to high load bearing soils are present below
formation level. Accordingly, basement raft type of foundations is considered appropriate of the proposed
structures to be set at a depth of approximately 3.5m below existing ground level.
7.1 Excavation for the Basement
It is understood from the information provided by the client that single level of basement are likely to be
founded at a depth of around 3.5m below the existing ground level. The excavation works should be
carried out in accordance with good construction practice, such as that embodied in British Standards BS
6031: 1981 Code of Practice for Earthworks, or a similar recognized Standard.
The indications are that the buildings will occupy almost the whole of the plots therefore; vertical sides
will be required to the excavation. Sheet piles could be used for this purpose, or king piles with suitable
infill panels. Considering the size of the excavation, it is considered that tie back anchors may be
required in order to limit the deflection of the walls. If anchors are required they should be designed to a
standard, such as British Standard, BS 8081, Code of practice for ground anchorages, taking into
account the aggressive nature of the soils and groundwater into which they will be placed.
Alternatively, a permanent support system could be considered, such as secant piles or diaphragm
walling, which could then be incorporated into the walls of the basement.
7.2 Shallow Footings and Basement raft Foundations
Allowable bearing pressures are dependent on the shear strength of the soil and the tolerance of the
proposed structure to settlement. In granular soils, the latter factor is normally more critical. Settlement in
such deposits normally takes place during construction and initial loading but, where more silty or
cohesive materials exist; there could be a degree of time dependent consolidation. Therefore as granular
soils are present at this site settlement will be the governing factor in considering foundation design.
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For any shallow structures , it is recommended that an allowable bearing pressure of 90kN/m 2 should
not be exceeded on isolated strip / rectangular or pad footings, up to 3.0m in width, in order to keep
settlement within tolerable limits. Shallow foundations should be set at a depth of approximately 1.0m belowexisting ground level.
With loads of the magnitudes quoted above for shallow foundations, total settlement is calculated as being
less than the generally accepted tolerance of 25 mm, with differential movements being minimal.
For wider, or raft type of foundations , It should however be noted that the proposed formation level is
only about 8.5m above the termination depth of the boreholes, while the pressure bulb below a raft
foundation (estimated as being about 30m wide) would extend to around 37.5m below formation level,
that is 25.5m below the termination depth of the boreholes. The properties of the strata below the depthof the boreholes have therefore been assumed to be the same as those present over the depth
investigated. The assessments of settlements of the raft are therefore likely to be conservative.
Based on the subsurface design profile given in Table 1 of section 6.0 and SPT N values verses depths
Plate 3, assessments of net bearing pressure, with corresponding estimated orders of settlement, are
given below in Table 2 for a rigid raft foundation.
These recommendations for raft t ype of foundations are given wit h raft being set at around 3.5m
below existing ground level.
Table 2:- Assessment of Bearing pressure and Settlement for a basement raft foundations on naturalground (Merehof Method).
Net Uniform Bearing Pressure
(kN/m 2)
Estimated Average Settlement
(mm)
100 25
120 30
140 35
160 40
180 45
200 50
Depending on the rigidity of raft, differential movement is estimated to be less than half the respective
total value. Based on above bearing pressure with corresponding estimated order of settlement a
Modulus of Sub-grade Reaction can be taken as approximately 10,000 kN/m 3.
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With loads of the magnitudes quoted above for raft foundations, total settlement is calculated as being less
than the generally accepted tolerance of 50 mm, with differential movements being half of the total settlement.
When excavating to foundation level, care should be taken not to disturb strata underlying formation levelotherwise settlement in excess of those quoted above could occur. If any disturbance does occur, or if
any soft spots or gypsiferous soils are encountered, the material should be removed and replaced by
selected granular fill, which should be properly compacted before the foundations are constructed.
Prior to construction of the foundations the soil at formation level should be compacted to not less than
95% (for engineered fill) and 98% (road base material) of the soils maximum dry density, as determined
from the modified Proctor test. The compacted surface should then be protected by immediately covering
with a layer of concrete blinding.
7.3 Retaining Structures
As discussed above it is understood that development at the site will involve excavation to approximately
3.5-4.5m below existing ground level. Retaining walls will therefore be required as part of the basement
structure and possibly also as temporary works.
The parameters summarised in Table 3 are recommended for the design of retaining structures.
Table 3:- Recommended Design Parameters for Retaining Structures
Soil Parameters Soil PropertiesDense, slightly silty, SAND
Bulk Density (Mg/m3) 1.75
Submerged Density (Mg/m3) 0.75Internal Friction Phi (degree) 30Coefficient of lateral earth pressure
KoKaKp
0.480.323.12
In the above table Ko has been determined using Bishops procedure, with Rankines method being used
to calculate both Ka and Kp.
7.4 Concrete Design For Foundation Purposes
One (1) soil sample was tested for chemical analysis. The sulphate contents (expressed as percentage of
sulphur trioxide) of the soil samples tested was () %. The chloride contents for the soils tested were () % The
pH value of the sample tested was ().
For guidance for a suitable concrete design it is recommended that reference should be made to CIRIA
Special Publication 31 (The CIRIA Guide to Concrete Construction in the Gulf Region published by the
Construction Industry Research and Information Association, London 1984). This publication considers
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8.0 REPORT LIMITATIONS
As mentioned in the report the boreholes made were of 150mm in diameter. The information received from
the limited number and the diameter of boreholes may not represent the entire site and may not reveal all the
weak layers or conditions especially when they are localized. Hence no responsibility can be borne for
conditions not revealed by boreholes made on the site. In case of any such findings we shall be contacted
immediately to arrange a site visit by a geotechnical engineer to make an on site study of such conditions
after which recommendations if it is deemed necessary will be revised.
The borehole logs and related information represent subsurface conditions only at the specific locations and
times where sampling was conducted. Any lines designating the changes between soil and/ or rock layers
represent approximate boundaries. The transition between deposits/ strata may be gradual, or may occur
between recovered samples.
During the site work ground water was not encountered in the boreholes up to termination depth of
boreholes. It should be noted, however, that groundwater levels are subject to variation caused by tidal
and weather seasonal variations and by changes of local drainage and or pumping conditions. The levels
may at time be significantly different to those measured during the investigation.
The recommendations and discussions given in this report are based on the subsurface conditions
encountered during the site investigation work and on the results of the field and laboratory testing on
samples obtained from the limited number of boreholes. There may be, however, conditions pertaining to
the site which has not been in to account due to the limited number of boreholes.
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PLATES
LOCATION PLAN PLATE 1
SITE PLAN PLATE 2
SPT VALUES VS DEPTH PLATE 3
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SITE: B+G+1 Villa TITLE: Location PlanPlot No. RN. 036DubaiLand Dubai
SITE LOCATIONDUBAI LAND
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BH1
BH2
SITE: B+G+1 Villa TITLE: Site Plan
Plot No. RN. 036, Dubai LandDubai JOB REF : GSI/0113/12/DXB United Arab Emirates
BH1
BH2
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0
1
2
3
4
5
6
D E P T H ( m )
'N' VALUES
Design Profil e
LooseVery Loose M.Dense V.DenseDense
SITE: B+G+1 Villa TITLE: Summary of SPTPlot No. RN. 036, Dubai Land Values vs Depth
DubaiJOB REF: GSI/0113/12/DXB UnitedArabEmirates
0
1
2
3
4
5
6
7
8
9
10
11
12
1 10 100
D E P T H ( m )
'N' VALUES
BH 2-SPT Design Profile BH 1-SPT
Design Profil e
LooseVery Loose M.Dense V.DenseDenseLooseVery Loose M.Dense V.DenseDense
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APPENDIX AFIELD RESULTS
BOREHOLE LOG LEGEND & CLASSIFICATION SYSTEMS PLATES A1.1 TO A1.3
SOIL/ROCK STRENGTH DEFINITIONS PLATE A2
BOREHOLE LOGS PLATES A3.1.1 TO A3.2.2
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SYMBOL LEGEND FOR GEOTECHNICAL LOGS
Appendix A: Plate A1.1
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SOIL CLASSIFICATION SYSTEM (Based on BS 5930)
Appendix A: Plate A1.2
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CARBONATE CLASSIFICATION SYSTEM (Based on Clark & Walker)
Appendix A: Plate A1.3
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3,2/4,4,3,5N=16
2,1/2,2,3,2N=9
1,2/2,4,3,2N=11
3,1/1,4,3,4N=12
3,2/4,4,3,5N=16
5,7/9,13,15,13*N*=50/265mm
7,9/12,15,18,5*
N*=50/255mm
5,10/10,12,12,16N=50
8,12/17,22,11*,*N*=50/180mm
9,14/17,24,9*,*N*=50/170mm
10,15/25,25*,*,*N*=50/115mm
14,11*/27,23*,*,*N*=50/115mm
B1
S2
S3
S4
S5
S6
S7
S8
S9
S10
S11
S12
S13
0.50
0.95
1.45
1.95
2.45
2.95
3.90
4.88
5.87
6.83
7.82
8.87
0.00
0.50
1.00
1.50
2.00
2.50
3.50
4.50
5.50
6.50
7.50
8.50
9.50
Light brown, silty, fine SAND.
Medium dense locally loose, brown, silty, fineSAND.
Locally loose at 1.0m depth.
Very dense, reddish brown, slightly silty to silty,fine to medium SAND with occasional slightly tomoderately cemented sand /sandstonefragments.
Very dense, greyish brown, slightly silty to silty,fine to medium SAND with some slightly tomoderately cemented sand /sandstonefragments.
Project:
CasingDepth
(m)
B+G+1 Villa
GraphicSymbol
Water
Pilcon Wayfarer
Cable Percussive
Rock Core Quality
DateWater Depth(m)
1. Borehole was drilled up to 12.0m depth below the existingground level.2 G d l l d il h i i
Remarks:Logged b
Strata Description
AM
Equipment:
E N
Coordinates:
Core Diameter (mm):
Bore Diameter (mm):
Start Date:
Fluid Flush:
Method:
23/08/2012
150
Borehole ProgressDepth(m)
1
2
3
4
5
6
7
8
9
10
RQD
SampleType &Depth(m)
Sample/ TestRecords TCR
SampleNo. SCR
Surface Elevation: m
BH01 ATERIAL LAB
Borehole No.:
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23/08/2012
16,9*/30,20*,*,*N*=50/125mm
17,8*/32,18*,*,*N*=50/115mm
S14
S15
10.50
11.50
(As previous sheet)Very dense, greyish brown, slightly silty to silty,fine to medium SAND with some slightly tomoderately cemented sand /sandstonefragments.
Borehole Terminated at 12.0m Depth
Project:
CasingDepth
(m)
B+G+1 Villa
GraphicSymbol
Water
Pilcon Wayfarer
Cable Percussive
Rock Core Quality
DateWater Depth(m)
1. Borehole was drilled up to 12.0m depth below the existingground level.2 G d l l d il h i i
Remarks:Logged b
Strata Description
AM
Equipment:
E N
Coordinates:
Core Diameter (mm):
Bore Diameter (mm):
Start Date:
Fluid Flush:
Method:
23/08/2012
150
Borehole ProgressDepth(m)
11
12
13
14
15
16
17
18
19
20
RQD
SampleType &Depth(m)
Sample/ TestRecords TCR
SampleNo. SCR
Surface Elevation: m
BH01 ATERIAL LAB
Borehole No.:
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2,2/3,2,3,4N=12
1,2/2,2,3,3N=10
2,2/3,4,4,3N=14
2,3/2,3,3,2N=10
2,3/3,3,4,4N=14
3,3/7,13,17,13N=50
8,10/12,13,18,7*
N*=50/265mm
7,11/15,19,16*,*N*=50/245mm
10,12/15,20,15*,*N*=50/190mm
10,15/20,22,8*,*N*=50/160mm
12,13/17,20,13*,*N*=50/170mm
15,10*/25,25,*,*N*=50/150mm
B1
S2
S3
S4
S5
S6
S7
S8
S9
S10
S11
S12
S13
0.50
0.95
1.45
1.95
2.45
2.95
3.91
4.89
5.84
6.83
7.81
8.82
0.00
0.50
1.00
1.50
2.00
2.50
3.50
4.50
5.50
6.50
7.50
8.50
9.50
Light brown, silty, fine SAND.
Medium dense locally loose, brown, silty, fineSAND.
Locally loose at 1.0m & 2.0m depth.
Very dense, reddish brown, slightly silty to silty,fine to medium SAND with occasional slightly tomoderately cemented sand /sandstonefragments.
Very dense, greyish brown, slightly silty to silty,fine to medium SAND with some slightly tomoderately cemented sand /sandstonefragments.
Project:
CasingDepth
(m)
B+G+1 Villa
GraphicSymbol
Water
Pilcon Wayfarer
Cable Percussive
Rock Core Quality
DateWater Depth(m)
1. Borehole was drilled up to 12.0m depth below the existingground level.2 G d l l d il h i i
Remarks:Logged b
Strata Description
AM
Equipment:
E N
Coordinates:
Core Diameter (mm):
Bore Diameter (mm):
Start Date:
Fluid Flush:
Method:
25/08/2012
150
Borehole ProgressDepth(m)
1
2
3
4
5
6
7
8
9
10
RQD
SampleType &Depth(m)
Sample/ TestRecords TCR
SampleNo. SCR
Surface Elevation: m
BH02 ATERIAL LAB
Borehole No.:
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25/08/2012
17,8*/23,27,*,*N*=50/150mm
16,9*/25,25*,*,*N*=50/135mm
S14
S15
10.50
11.50
(As previous sheet)Very dense, greyish brown, slightly silty to silty,fine to medium SAND with frequent slightly tomoderately cemented sand /sandstonefragments.
Borehole Terminated at 12.0m Depth
Project:
CasingDepth
(m)
B+G+1 Villa
GraphicSymbol
Water
Pilcon Wayfarer
Cable Percussive
Rock Core Quality
DateWater Depth(m)
1. Borehole was drilled up to 12.0m depth below the existingground level.2 G d l l d il h i i
Remarks:Logged b
Strata Description
AM
Equipment:
E N
Coordinates:
Core Diameter (mm):
Bore Diameter (mm):
Start Date:
Fluid Flush:
Method:
25/08/2012
150
Borehole ProgressDepth(m)
11
12
13
14
15
16
17
18
19
20
RQD
SampleType &Depth(m)
Sample/ TestRecords TCR
SampleNo. SCR
Surface Elevation: m
BH02 ATERIAL LAB
Borehole No.:
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APPENDIX C
APPENDICES TO SITE INVESTIGATION REPORTS
APPENDIX TO SITE INVESTIGATION REPORT PLATE C1
FIGURE 6 AND TABLE 13 FROM CIRIA SPECIAL PUBLICATION 31 PLATE C2
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APPENDIX TO SITE INVESTIGATION REPORT
C- 1.1 GROUNDWATER
The water level recorded in a borehole during boring and / or drilling does not indicate the actual
level of the water table. The drilling process and dewatering in the vicinity, can affect the level of
groundwater, particularly when rotary drilling is in process, the water is normally used as the drilling
fluid.
To obtain a true indication and for long term observations of the stable groundwater level perforated
standpipe/ piezometer should be installed in a borehole.
C- 1.2 GEOTECHNICAL INFORMATION
Factual evidence has been obtained from the results of the boreholes and other field tests. These
evidences only provide information about a relatively small column of the soil and rock and the
possibility of actual conditions differing must be recognised.
The comments and recommendations given in this report are subjected to the limitations imposed
by the inherent nature of the site investigation. Hence no responsibilities can be born for conditions
not revealed by boreholes or trial pits made on the site. In case of any such findings, we shall be
contacted immediately to arrange a site visit by our geotechnical engineer to make an onsite study
of such conditions after which recommendations if it is deemed necessary will be revised.
The interpretation and conclusions given in this report assume that the ground conditions do not
vary beyond the range revealed by the investigation. It is possible that different conditions may be
present on, or adjacent to the site which have not been investigated and therefore, have not been
considered.
The recommendations given in this report apply only to the proposed developments and should not
be used for any other project on the site or adjacent sites, without consulting this laboratory.
Appendix C: Plate C1.1
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