soil investigation report

1. SOIL INVESTIGATION REPORT
FOR
PROPOSED BOXING AND GYMNASTIC COURT
AT
ROYAL COLLEGE- COLLOMBO 7
Client:-
DEEPWELL DRILLING & SOIL TECHNOLOGIES (PVT)
LTD
Associate company of
DAX ENGINEERING CO. (PVT) LTD

2. Page | 0
TABLE OF CONTENT
1.0 INTRODUCTION....................................................................................................... 1
2.0 SCOPE OF THE WORK............................................................................................. 1
3.0 PROPOSED STRUCTURE ........................................................................................ 2
4.0 SITE RECONNAISSANCE........................................................................................ 2
4.1 GENERAL ..............................................................................................................2
5.0 FIELD INVESTIGATION.......................................................................................... 2
5.1 DRILLING ..............................................................................................................2
5.2 SAMPLING & CLASSIFICATION .......................................................................3
5.3 STANDARD PENETRATION TEST ....................................................................3
5.4 SOIL PROFILE.......................................................................................................4
5.5 GROUND WATER TABLE...................................................................................4
6.0 ENGINEERING APPRECIATION OF SUBSOIL CONDITION ............................. 4
6.1 GENERAL OBSERVATIONS...............................................................................4
APPENDIX I - LOGS OF BOREHOLES

3. Page | 1
DAX ENGINEERING (PVT) LTD
REPORT ON
SOIL INVESTIGATION FOR PROPOSED BOXING AND GYMNASTIC
COURT FOR ROYAL COLLEGE- COLLOMBO 7
1.0 INTRODUCTION
On the request of Mr Nandana Karunasena, Deepwell Drilling & Soil Technologies(PVT) Ltd
conducted a soil investigations for proposed boxing and gymnastic court for Royal College-
Colombo 7.
The suggestions and recommendations given in this report are based on the information gathered
from the client, site reconnaissance, field investigations, laboratory soil classification and analysis.
Objectives of the investigation are to obtain:
 Geological and geotechnical reconnaissance
 Subsurface conditions at the site including soil profile and description.
2.0 SCOPE OF THE WORK
Scope of the investigations is mainly in accordance with the client and is as follows:
 Advancing five numbers (5 Nos.) of boreholes at the site using core drilling
technique to establish the soil profile at the site (covering the proposed site).
 Conducting Standard Penetration Test (SPT) at 1.0 m intervals.
 Data analysing and preparation of report.

4. Page | 2
3.0 PROPOSED STRUCTURE
According to the information furnished by the Client, it is intended to construct buildings at the
proposed land. (Plan view of the proposed building is attached below)
4.0 SITE RECONNAISSANCE
4.1 GENERAL
The proposed site is situated at Royal College, Colombo 7.
5.0 FIELD INVESTIGATION
Field investigations were commenced on the 28th of December 2012 and fieldwork was
completed in twelve days.
All field and laboratory tests were carried out in accordance with the following specifications.
BS 5930 British Standard for Site Investigation.
Earth manual published by the United States Bureau of Reclamation.
The field work was carried out under the supervision of officer in charge who was responsible for
locating the bore holes, nominating and directing all sampling, providing field logs of the soil
profiles encountered and all other field tests.
5.1 DRILLING
The objective of drilling is to obtain geological and geotechnical information and to understand
the sub-soil conditions. Drilling was carried out by implementing one drilling crew.
Boreholes were carried out using rotary core drilling technique with Heavy drilling machine and
NX size diamond core bits through the overburden.

5. Page | 3
5.2 SAMPLING & CLASSIFICATION
All samples were collected under the supervision of the site officer.
Disturbed
Disturbed soil samples from boreholes were collected at every 1.0 m depth intervals by using split
spoon sampler having a sharp cutting edge at its lower end is forced into the ground by dynamic
impact.
5.3 STANDARD PENETRATION TEST
Standard penetration test was conducted at every 1.0m depth intervals in all boreholes in
accordance with the Test No 19 BS 1377 -1975 in order to obtain continues strength profile within
each borehole.
Procedure for SPT
The boreholes were cleaned out to the required depth in such a manner as not to disturb the soil at
the depth at which the test is to be performed.
The cleaned split spoon sampler is then attached to the drilling rods and lowered to the bottom of
the hole. The drive assembly is next connected to the rod.
The sampler then driven into the ground with blows from the 63.5 kg hammer falling through 760
mm.
The sampler is first seated in position by driving 150 mm in the soil, and the number of blows
required to affect this seating were recorded.
The sampler is then driven a further 300 mm (or until 50 blows not including the seating drive),
and the number of blows required for 300 mm penetration after the seating drive were recorded.
The total number of blows required for the 300 mm penetration after the seating drive is termed
the Standard Penetration Resistance (SPT), N.
Disturbed soil samples retained in the SPT split tube were collected for visual soil classification
and for necessary laboratory tests according to BS-1377.

6. Page | 4
Graphical representation of SPT values are given in logs of boreholes in Appendix I. For the
purpose of preparing the logs of boreholes, compactness/consistency was classified according to
the following tables.
Table 5.4.1 Cohesionless soils
Compactness SPT No.
Very loose
Loose
Medium dense
Dense
Very dense
0 – 4
4 -10
10 – 30
30 – 50
>50
Table 5.4.2 Cohesive soils
Consistency SPT No.
Very soft
Soft
Firm
Stiff
Very Stiff
Hard
0 – 2
2 -4
4 – 8
8 – 15
15 - 30
>30
5.4 SOIL PROFILE
Engineering logs of the boreholes along with the explanation sheets describing the terms and
symbols used and the SPT values are presented in Appendix I.
5.5 GROUND WATER TABLE
Ground water table of the boreholes has been observed during the period of drilling work and
record the logs of boreholes.
6.0 ENGINEERING APPRECIATION OF SUBSOIL CONDITION
6.1 GENERAL OBSERVATIONS
The general observations from borehole information are summarized in Table 6.1 below.

7. Page | 5
Table 6.1 - Subsurface Condition at Different Borehole Locations.
Borehole No.
Borehole
Elevation
(m RL)
Thickness of
overburden
soil , (m)
Depth to
completely
weathered
rock/hard
Stratum ,(m)
Depth of
Borehole,(m)
Ground Water
Level (m)
BH 1 - 24.80 24.80 24.80 2.80
BH 2 - 24.50 24.50 24.50 3.40
BH 3 - 22.50 22.50 22.50 1.40
BH 4 - 22.80 22.80 22.80 1.45
BH 5 - 23.15 23.15 23.15 1.80

8. N
Ground Elevation (m) E
Boring Method : Depth of Borehole (m)
Flushing Medium
Depth
below
GL
(m)
1 2 3
for 30
cm
0.00 S1 0.00 0.00
0.45
1.00 S2 1.00 1.00 3 4 6 10
1.45
2.00 S3 2.00 2.00 4 4 8 12
2.45
3.00 S4 3.00 3.00 18 18 21 39
3.45
4.00 S5 4.00
4.45 4.50 17 18 19 37
5.00 S6 5.00 5.00
5.45
6.00 S7 6.00 6.00 9 10 12 22
SW
6.45
7.00 S8 7.00
7.45 7.50 10 10 13 23
8.00 S9 8.00 8.00
8.45
9.00 S10 9.00 9.00 8 12 16 28
9.45
10.00 S11 10.00 10.00
10.45 10.50 9 13 15 28
11.00 S12 11.00 11.00
11.45
12.00 S12 12.00 12.00 14 16 16 32
Disturbed Sample
SW
SAND, brown, fine to medium sand
grains, VERY DENSE
SAND, brown, fine sand grains,
MEDIUM DENSE
Elevation(mMSL)
Strata&Layer
Thickness
GroupSymbol
Description of soil
SPT
28/12/2012
Type &
Depth of
sampling
(m)
Depth
tested
(m)
2.8m
Graphical Presentation
SPT Resistance - Blows/30cm
28/12/2012Depth to GWL (m)
Per 15cm
W Washed Sample
Location:
Co-ordinates
Completed on
Project:
Water
Royal College
Core Drilling (NX/NW)
Date
Borehole No.
24.8m Commenced on
Logged by
SPT Sample
STANDARD PENETRATION TEST DATA
Number of blows
N-Value
LN
06/02/2013
DEEPWELL DRILLING & SOIL TECHNOLOGIES(PVT) LTD
BH - 1
LOG OF BOREHOLE
Sheet No
1 of 10
PROPOSED BOXING AND GYMNASTIC COURT FOR
ROYAL COLLEGE, COLOMBO 7
0
10
12
39
37
22
23
28
28
32
00
0 10 20 30 40 50

9. N
Ground Elevation (m) E
Boring Method : Depth of Borehole (m)
Flushing Medium
Depth
below
GL
(m)
1 2 3
for 30
cm
12.00 12.00 12.00 14 16 16 32
12.45
13.00 13.00
13.45 13.50 7 11 9 20
14.00 14.00
14.45
15.00 15.00 15.00 8 12 14 26
15.45
16.00 16.00
16.45 16.50 8 11 14 25
17.00 17.00
17.45
18.00 18.00 18.00 8 14 16 30
18.45
19.00 19.00
19.45 19.50 50<
20.00 20.00
20.45
21.00 21.00 21.00 50<
21.45
Partly weathered rock
22.00 22.00
22.45
23.00 23.00
23.45
24.00 24.00 24.00 15 26 28 54
Borehole terminated at 24.80m -
sound rock
DEEPWELL DRILLING & SOIL TECHNOLOGIES(PVT) LTD Sheet No
2 of 10
LOG OF BOREHOLE
Project:
PROPOSED BOXING AND GYMNASTIC COURT FOR
ROYAL COLLEGE, COLOMBO 7
Borehole No. BH - 1
Co-ordinates
Location: Royal College
Core Drilling (NX/NW) 24.8m Commenced on 28/12/2012
Water Depth to GWL (m) 2.8m Completed on 28/12/2012
STANDARD PENETRATION TEST DATA
Depth
tested
(m)
Number of blows
Per 15cm N-Value
Graphical Presentation
SPT Resistance - Blows/30cm
Elevation(mMSL)
Strata&Layer
Thickness
GroupSymbol
Description of soil
Type &
Depth of
sampling
(m)
SPT SPT Sample Date 06/02/2013
LN
SAND, gray, medium grained,
VERY DENSE
Disturbed Sample W Washed Sample Logged by
SAND, gray, medium grain, VERY
DENSE
000000000000
0 10 20 30 40 50

10. N
Ground Elevation (m) E
Boring Method : Depth of Borehole (m)
Flushing Medium
Depth
below
GL
(m)
1 2 3
for 30
cm
0.00 S1 0.00 0.00 6 5 6 11
0.45
1.00 S2 1.00 1.00 4 3 3 6
1.45
2.00 S3 2.00 2.00 4 4 3 7
2.45
3.00 S4 3.00 3.00 17 18 20 38
3.45
4.00 S5 4.00
4.45 4.50 20 19 20 39
5.00 S6 5.00 5.00
5.45
6.00 S7 6.00 6.00 10 13 16 29
6.45
7.00 S8 7.00
7.45 7.50 10 14 16 30
8.00 S9 8.00 8.00
8.45
9.00 S10 9.00 9.00 13 15 16 31
9.45
10.00 S11 10.00 10.00
10.45 10.50 13 14 16 30
11.00 S12 11.00 11.00
11.45
12.00 S12 12.00 12.00 2 6 5 11
Disturbed Sample
CLAYEY SAND,
SANDY SOIL
Grayish SANDY SOIL with clay bands
SAND, fine to medium, VERY DENSE
Elevation(mMSL)
Strata&Layer
Thickness
GroupSymbol
Description of soil
SPT
28/12/2012
Type &
Depth of
sampling
(m)
Depth
tested
(m)
3.4m
Graphical Presentation
SPT Resistance - Blows/30cm
28/12/2012Depth to GWL (m)
Per 15cm
W Washed Sample
Location:
Co-ordinates
Completed on
Project:
Water
Nawala
Core Drilling (NX/NW)
Date
Borehole No.
24.50m Commenced on
Logged by
SPT Sample
STANDARD PENETRATION TEST DATA
Number of blows
N-Value
LN
06/02/2013
DEEPWELL DRILLING & SOIL TECHNOLOGIES(PVT) LTD
BH - 2
LOG OF BOREHOLE
Sheet No
1 of 2
PROPOSED BOXING AND GYMNASTIC COURT FOR
ROYAL COLLEGE, COLOMBO 7
11
6
7
38
39
29
23
31
30
11
00
0 10 20 30 40 50

11. N
Ground Elevation (m) E
Boring Method : Depth of Borehole (m)
Flushing Medium
Depth
below
GL
(m)
1 2 3
for 30
cm
12.00 12.00 12.00 2 6 5 11
12.45
13.00 13.00
13.45 13.50 2 7 5 12
14.00 14.00
14.45
15.00 15.00 15.00 20 20 22 42
15.45
16.00 16.00
16.20
16.45 16.50 26 26 28 54
17.00 17.00
17.10
17.45
18.00 18.00 18.00 21 23 23 46
18.45
19.00 19.00
19.45 19.50 24 24 25 49
20.00 20.00
20.45
Partly weathered Rock
21.00 21.00
21.45
22.00 22.00
22.45 22.50 28 29 33 62
23.00 23.00
23.45
24.00 24.00 24.00 50<
Sound Rock 24.50
SPT SPT Sample Date 06/02/2013
CLAYEY SAND, fine to medium
sand, LOOSE to DENSE
SAND, fine to medium, VERY
DENSE
Disturbed Sample W Washed Sample Logged by LN
Elevation(mMSL)
Strata&Layer
Thickness
GroupSymbol
Description of soil
Type &
Depth of
sampling
(m)
STANDARD PENETRATION TEST DATA
Depth
tested
(m)
Number of blows
Per 15cm N-Value
Graphical Presentation
SPT Resistance - Blows/30cm
Royal College
Core Drilling (NX/NW) 24.50m Commenced on 30/12/2012
Water Depth to GWL (m) 3.4m Completed on 30/12/2012
DEEPWELL DRILLING & SOIL TECHNOLOGIES(PVT) LTD Sheet No
4 of 10
LOG OF BOREHOLE
Project:
PROPOSED BOXING AND GYMNASTIC COURT FOR
ROYAL COLLEGE, COLOMBO 7
Borehole No. BH - 2
Co-ordinates
Location:
000000000000
0 10 20 30 40 50

12. N
Ground Elevation (m) E
Boring Method : Depth of Borehole (m)
Flushing Medium
Depth
below
GL
(m)
1 2 3
for 30
cm
0.00 S1 0.00 0.00 5 6 6 12
0.45
1.00 S2 1.00 1.00 9 10 11 21
1.45
2.00 S3 2.00 2.00 9 10 12 22
2.45
3.00 S4 3.00 3.00 26 28 29 57
3.45
4.00 S5 4.00
4.45 4.50 21 27 29 56
5.00 S6 5.00 5.00
5.45
6.00 S7 6.00 6.00 21 27 29 56
6.45
7.00 S8 7.00
7.45 7.50 20 22 29 51
8.00 S9 8.00 8.00
8.45
9.00 S10 9.00 9.00 19 20 22 42
9.45
10.00 S11 10.00 10.00
10.45 10.50 21 19 24 43
11.00 S12 11.00 11.00
11.45
12.00 S12 12.00 12.00 14 18 24 42
DEEPWELL DRILLING & SOIL TECHNOLOGIES(PVT) LTD
BH - 3
LOG OF BOREHOLE
Sheet No
6 of 10
PROPOSED BOXING AND GYMNASTIC COURT FOR
ROYAL COLLEGE, COLOMBO 7
Date
Borehole No.
22.50m Commenced on
Logged by
SPT Sample
STANDARD PENETRATION TEST DATA
Number of blows
N-Value
LN
06/02/2013
Location:
Co-ordinates
Completed on
Project:
Water
Royal College
Core Drilling (NX/NW)
SPT
28/12/2012
Type &
Depth of
sampling
(m)
Depth
tested
(m)
1.4m
Graphical Presentation
SPT Resistance - Blows/30cm
28/12/2012Depth to GWL (m)
Per 15cm
W Washed Sample
Elevation(mMSL)
Strata&Layer
Thickness
GroupSymbol
Description of soil
Disturbed Sample
VERY DENSE laterite soil
Red top soil
SANDY SOIL
SANDY CLAY
12
21
22
42
43
42
00
0 10 20 30 40 50

13. N
Ground Elevation (m) E
Boring Method : Depth of Borehole (m)
Flushing Medium
Depth
below
GL
(m)
1 2 3
for 30
cm
12.00 12.00 12.00 14 18 24 42
12.45
13.00 13.00
13.45 13.50 13 19 23 42
SANDY SOIL, medium grained
14.00 14.00
14.45
15.00 15.00 15.00 14 20 25 45
15.45
16.00 16.00
16.20
16.45 16.50 21 23 25 48
17.00 17.00
17.45
18.00 18.00 18.00 17 24 24 48
18.45
19.00 19.00
19.45 19.50 19 24 27 51
20.00 20.00
20.45
Weathered Rock
21.00 21.00 21.00 50<
21.45
22.00 22.00
22.50 22.45
Sound Rock
SPT SPT Sample Date 06/02/2013
SAND, VERY DENSE
Disturbed Sample W Washed Sample Logged by LN
Elevation(mMSL)
Strata&Layer
Thickness
GroupSymbol
Description of soil
Type &
Depth of
sampling
(m)
STANDARD PENETRATION TEST DATA
Depth
tested
(m)
Number of blows
Per 15cm N-Value
Graphical Presentation
SPT Resistance - Blows/30cm
Royal College
Core Drilling (NX/NW) 22.50 Commenced on 04/01/2013
Water Depth to GWL (m) 1.40 Completed on 04/01/2013
DEEPWELL DRILLING & SOIL TECHNOLOGIES(PVT) LTD Sheet No
6 of 10
LOG OF BOREHOLE
Project:
PROPOSED BOXING AND GYMNASTIC COURT FOR
ROYAL COLLEGE, COLOMBO 7
Borehole No. BH - 3
Co-ordinates
Location:
000000000000
0 10 20 30 40 50

14. N
Ground Elevation (m) E
Boring Method : Depth of Borehole (m)
Flushing Medium
Depth
below
GL
(m)
1 2 3
for 30
cm
0.00 S1 0.00 0.00 7 5 2 7
0.45
1.00 S2 1.00 1.00 2 4 4 8
1.45
SANDY SOIL, DENSE
2.00 S3 2.00 2.00 6 8 12 20
2.45
3.00 S4 3.00
3.45
4.00 S5 4.00
4.45 4.50 8 11 13 24
5.00 S6 5.00 5.00
5.45
6.00 S7 6.00 6.00 10 12 7 19
6.45
7.00 S8 7.00
7.45 7.50 11 12 10 22
8.00 S9 8.00 8.00
8.45
9.00 S10 9.00 9.00 10 13 11 24
9.45
10.00 S11 10.00 10.00
10.45 10.50 3 4 4 8
11.00 S12 11.00 11.00
11.45
SANDY CLAY, medium grained,
medium dense
12.00 S12 12.00 12.00 3 5 4 9
DEEPWELL DRILLING & SOIL TECHNOLOGIES(PVT) LTD
BH - 4
LOG OF BOREHOLE
Sheet No
1 of 2
PROPOSED BOXING AND GYMNASTIC COURT FOR
ROYAL COLLEGE, COLOMBO 7
Date
Borehole No.
22.80m Commenced on
Logged by
SPT Sample
STANDARD PENETRATION TEST DATA
Number of blows
N-Value
LN
06/02/2013
Location:
Co-ordinates
Completed on
Project:
Water
Royal College
Core Drilling (NX/NW)
SPT
28/12/2012
Type &
Depth of
sampling
(m)
Depth
tested
(m)
1.45m
Graphical Presentation
SPT Resistance - Blows/30cm
28/12/2012Depth to GWL (m)
Per 15cm
W Washed Sample
Elevation(mMSL)
Strata&Layer
Thickness
GroupSymbol
Description of soil
Disturbed Sample
SAND with clay bands
SANDY SOIL
7
8
20
24
19
22
24
8
9
00
0 10 20 30 40 50

15. N
Ground Elevation (m) E
Boring Method : Depth of Borehole (m)
Flushing Medium
Depth
below
GL
(m)
1 2 3
for 30
cm
12.00 12.00 12.00 3 5 4 9
12.45
13.00 13.00
13.45 13.50 10 22 23 45
14.00 14.00
14.45
15.00 15.00 15.00 11 20 23 43
15.45
16.00 16.00
16.45 16.50 12 21 24 45
17.00 17.00
17.10
17.45
18.00 18.00 18.00 13 24 24 48
18.45
19.00 19.00
19.45 19.50 11 22 24 46
20.00 20.00
20.45
21.00 21.00 21.00 12 21 25 46
21.45
22.00 22.00
22.45 22.50 50<
SOUND ROCK
23.00 23.00
23.45
24.00 24.00
SPT SPT Sample Date 06/02/2013
Disturbed Sample W Washed Sample Logged by LN
Elevation(mMSL)
Strata&Layer
Thickness
GroupSymbol
Description of soil
Type &
Depth of
sampling
(m)
STANDARD PENETRATION TEST DATA
Depth
tested
(m)
Number of blows
Per 15cm N-Value
Graphical Presentation
SPT Resistance - Blows/30cm
Royal College
Core Drilling (NX/NW) 22.80 Commenced on 05/01/2013
Water Depth to GWL (m) 1.45 Completed on 05/01/2013
DEEPWELL DRILLING & SOIL TECHNOLOGIES(PVT) LTD Sheet No
8 of 10
LOG OF BOREHOLE
Project:
PROPOSED BOXING AND GYMNASTIC COURT FOR
ROYAL COLLEGE, COLOMBO 7
Borehole No. BH - 4
Co-ordinates
Location:
000000000000
0 10 20 30 40 50

16. N
Ground Elevation (m) E
Boring Method : Depth of Borehole (m)
Flushing Medium
Depth
below
GL
(m)
1 2 3
for 30
cm
0.00 S1 0.00 0.00 2 3 2 5
0.45
1.00 S2 1.00 1.00 4 8 5 13
1.45
2.00 S3 2.00 2.00 3 9 14 23
2.40 2.45
3.00 S4 3.00 3.00 16 32 50 82
3.45
SM
4.00 S5 4.00
4.45 4.50 8 11 23 34
5.00 S6 5.00 5.00
5.20
5.45
6.00 S7 6.00 6.00 8 10 24 34
6.45
7.00 S8 7.00
7.45 7.50 13 13 17 30
8.00 S9 8.00 8.00
SW
8.45
9.00 S10 9.00 9.00 14 13 16 29
9.45
10.00 S11 10.00 10.00
10.45 10.50 14 16 18 34
11.00 S12 11.00 11.00
11.45
12.00 S12 12.00 12.00 15 17 18 35
DEEPWELL DRILLING & SOIL TECHNOLOGIES(PVT) LTD
BH - 5
LOG OF BOREHOLE
Sheet No
1 of 2
PROPOSED BOXING AND GYMNASTIC COURT FOR
ROYAL COLLEGE, COLOMBO 7
Date
Borehole No.
23.15m Commenced on
Logged by
SPT Sample
STANDARD PENETRATION TEST DATA
Number of blows
N-Value
LN
06/02/2013
Location:
Co-ordinates
Completed on
Project:
Water
Nawala
Core Drilling (NX/NW)
SPT
07/01/2013
Type &
Depth of
sampling
(m)
Depth
tested
(m)
1.8m
Graphical Presentation
SPT Resistance - Blows/30cm
07/01/2013Depth to GWL (m)
Per 15cm
W Washed Sample
Elevation(mMSL)
Strata&Layer
Thickness
GroupSymbol
Description of soil
Disturbed Sample
SW
SAND, fine to medium grain, DENSE
SILTY SAND, fine, VERY DENSE
SAND, fine to medium grain size,
VERY DENSE
5
13
23
34
29
43
42
00
0 10 20 30 40 50

17. N
Ground Elevation (m) E
Boring Method : Depth of Borehole (m)
Flushing Medium
Depth
below
GL
(m)
1 2 3
for 30
cm
12.00 12.00 12.00 15 17 18 35
12.45
13.00 13.00
13.45 13.50 17 30 30 60
14.00 14.00
14.45
15.00 15.00 15.00 50<
15.45
16.00 16.00
16.45 16.50 50<
17.00 17.00
17.45
18.00 18.00 18.00 50<
18.45
19.00 19.00
19.45 19.50 50<
20.00 20.00
20.45
21.00 21.00 21.00 24 38 49 50<
21.45
22.00 22.00
22.45 22.50 50<
23.00 23.00
23.15
Sound Rock
SPT SPT Sample Date 06/02/2013
Disturbed Sample W Washed Sample Logged by LN
Elevation(mMSL)
Strata&Layer
Thickness
GroupSymbol
Description of soil
Type &
Depth of
sampling
(m)
STANDARD PENETRATION TEST DATA
Depth
tested
(m)
Number of blows
Per 15cm N-Value
Graphical Presentation
SPT Resistance - Blows/30cm
SAND, fine to medium grain size,
VERY DENSE
Royal College
Core Drilling (NX/NW) 23.15 Commenced on 07/01/2013
Water Depth to GWL (m) 1.80 Completed on 07/01/2013
DEEPWELL DRILLING & SOIL TECHNOLOGIES(PVT) LTD Sheet No
10 of 10
LOG OF BOREHOLE
Project:
PROPOSED BOXING AND GYMNASTIC COURT FOR
ROYAL COLLEGE, COLOMBO 7
Borehole No. BH - 5
Co-ordinates
Location:
000000000000
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