Boreholes and tist pits.pdf

BH-01Sheet 1 of 4

30

8. APPENDIX B

8.1: Bore hole logs and Test pit logs

38 NIL

FIELD BOREHOLE LOG Borehole No. 01

1170856.769 N 3091270.931 E

30

Bed Rock: Quartz, mica schist of little whitish, greenish & grayish in color along with brownish

Overburden: Strata is coarse gravels of igneous and metamorphic origin, fine to medium in grain size & milky white, greenish & grayish in color

RQ

D %

General Description. SOIL: Name, Type, Colour,

Consistency, Structur, Origin- ROCK: Name, Colour,

Grain size, Texture and Fabric state of

weathering,State of Shear zone, Thickness, Filling

material

NIL19

0

1

Cor

e R

ecov

ery

%

Dep

th (m

)

2

1

2

SHIGO KAS HYDROPOWER PROJECT

Depth of bedrock:1.5 mProject: Shigo Kas HPP

Thic

knes

s (m

)/Run

No.

Lege

nd

Weir Site (Left Bank)

Dril

ling

Flui

d Lo

ss %

Cor

e B

arre

l/Bit

53

30

35

73

4965

38 NIL

4

6

patches encountered here. Strata is very poor in characterization and is of very fine grain size.

5

30

3

35

Strata is same as above but in lower part of run, fragmented core

recovered, whitish in color has more quartz content than in above strata.

Same as above.

Same as above.

94 67

Schistose igneous with more quartz recovered here. Whitish and grayish in

color. Strata is fine grained and of good strength.

Micauous schist of little grayish/whitish and dominantly greenish color

encountered here. Quartz content is very low. Strata is fine in grain size.

10

100 75

25

209 7

7

8

5

6

3

4

40

2

NIL

10 110

BH-01Sheet 2 of 4

Weir Site (Left Bank)

SHIGO KAS HYDROPOWER PROJECTFIELD BOREHOLE LOG

72 20 Same as in above section.

9 100 44 30 Same lithology as in above section.

8 78

11

12

13


Consistency, Structur, Origin- ROCK: Name,

Colour, Grain size, Texture and Fabric state of


material

Lege

nd

Dep

th (m

)

Thic

knes

s (m

)/Run

No.

Cor

e R

ecov

ery

%

RQ

D %

Dril

ling

Flui

d Lo

ss %

Cor

e B

arre

l/Bit

Project: Shigo Kas HPP

86 47 Quartz mica schist with little bit gneissic effect encountered here.

20

11 88

12 95 53

17

18

70 25

30 Same as above.

1510

16

Same as above.

19

14

30

111

BH-01Sheet 3 of 4

Project: Shigo Kas HPP Weir Site (Left Bank)

99 85 20

20

14

Same as in above section.13 95 7321

22

23

General Description. SOIL: Name, Type,

Colour, Consistency, Structure, Origin- ROCK: Name, Colour,


weathering,State of Shear zone, Thickness,

Filling material

Dep

th (m

)

Thic

knes

s (m

)/Run

No.

Cor

e R

ecov

ery

%

RQ

D %

Dril

ling

Flui

d Lo

ss %

FIELD BOREHOLE LOGSHIGO KAS HYDROPOWER PROJECT

Cor

e B

arre

l/Bit

Lege

nd

Strata is Schistose Gneiss Quartz and mica are major

components here as well. This lithology continuous till 26.5 m.

97 77 20

From 26.5 m, strata is quartz, mica schist again with same features as in the different

sections above.

2015 93 72

63 20

19 96 79 30

Strata is Quartz-Mica Schist along with some patches which show gneissic behavior. These

patches are encountered at different depths and only

18 96

99

25

26

30

27

28

29

24

16 48 30

17

112

BH-01Sheet 4 of 4

36

37

38

39

40

33

34

35


Colour, Consistency, Structur, Origin-

ROCK: Name, Colour, Grain size, Texture and

Fabric state of weathering,State of Shear zone, Thickness, Filling

material

Lege

nd

Dep

th (m

)

Thic

knes

s (m

)/Run

No.

Cor

e R

ecov

ery

%

RQ

D %

Dril

ling

Flui

d Lo

ss %

Cor

e B

arre

l/Bit

Shigo Kas HPP Location:

33 20

21 81 77

Project:

Besides this, there are some pure green patches of Micaous

schist and having almost no quartz or in very low quality.

These Mica schists patches were at depth from 32.7 to 33.7 m, 29

to 29.5 m and 27 to 27.5 m)

31

32

FIELD BOREHOLE LOGWeir Site (Left Bank)

20

30

67


BOTTOM OF BORE HOLE

113

BH-03Sheet 1 of 3

FIELD BOREHOLE LOG

30 NIL 25

4 15

NIL NIL 30

10

3

Fine to coarse grained sand of grayish color alongwith fine to coarse gravels of

igneous and metamorphic origin

2 32 NIL 25Medium to coarse gravels of igneous and

metamorphic origin, fine to medium in grain size and of varigated colors

recovered here

1170817.678 N

Cor

e R

ecov

ery

%

Dep

th (m

)

Thic

knes

s (m

)/Run

No.

3

2

1

Location: G.W.Depth 0.2


Cor

e B

arre

l/Bit

0

3091249.956 E

4

5 9 88

1


Consistency, Structur, Origin- ROCK: Name, Colour,



material

Lege

nd

Bed Rock: At depth of 2.9 m, strata is Quartz, Mica Schist, fine in grain size,

light grey & whitish color with little effect of gneisses as well.

RQ

D %

Dril

ling

Flui

d Lo

ss %

92 51

SHIGO KAS HYDROPOWER PROJECTBorehole 03

River BedBed Rock Depth 2.9

10

7 95 40 15

10

9 8 74 48

5 95 885

6

Strata is schistose genesis i.e. more gneissic in features and appearance with same quartz and mica content

and fine in grain size and grayish and whitish in color

7

8

90

6 1093

10

114

BH-03Sheet 2 of 3

809

11 92 70 5

FIELD BOREHOLE LOGShigo Kas HPP Location: Project: River Bed

62 5

Quartz-Mica Schist of same sort and properties as described

above in Run No. 4. At the depth between (13.5-14.2) m, green patch of mica encountered.

Some gneissic features are also prominent, which are developed at sand on depths. Strength of

the rock varies and is represented by the RQD value of

10 90

Dep

th (m

)

Thic

knes

s (m

)/Run

No.

Cor

e R

ecov

ery

%

RQ

D %

Dril

ling

Flui

d Lo

ss %

Cor

e B

arre

l/Bit

11

12

13

14

15

1053






material

Lege

nd

15

12 50 11 15

the runs.

17

18

16

8 20

14 70

13 50

20

3319

115

BH-03Sheet 3 of 3

640

NIL 20

18 93 93 5

17

RQ

D %

Dril

ling

Flui

d Lo

ss %

Project: Shigo Kas HPP Location:

15 80 43 5

23C

ore

Bar

rel/B

it

Lege

nd

24

Dep

th (m

)

Thic

knes

s (m

)/Run

No.

Cor

e R

ecov

ery

%





material

21

22 16 90 67 5

48

G.W.Depth 0.23091249.956 E1170817.678 N Bed Rock Depth 2.9

SHIGO KAS HYDROPOWER PROJECTFIELD BOREHOLE LOG Borehole No. 03

28

29

19 90 75

27

20

22 80 64 5

100 40 10

21 76

25

26

30

45 10

5

116

Sheet 1 of 1

Location:

Coordinates G.W.EL. 1.52 m

Consultants:

1

All four walls of the test pit are

showing same properties of

lithology. Composite sample has been taken for

the required laboratory tests.

The material excavated from

the Pit is representative of

the material

0.4

0.6

0.8

From 0 to 0.2 m material is sandy, gravely silt of light brownish in colour. Gravels are of igneous and metamorphic origin. From 0.2 to the bottom

of the pit, the material is boulders and gravels alongwith sandy clayey silt. Boulders are of greyish dominantly as well as brownish in colour. They

are approximately 60 to 70% of total volume of the material in this section. Boulders are rounded to sub rounded and are of igneous and

metamorphic origin. Boulders are randomly distributed throughout in this section in all the walls.

1.0

Lege

nd Grain Size (cm) Consistency

0.0

0.2

20 -

60

> 60

Soft

Firm

Stif

f

N: 1171260 E:3091069

Unit in meter

Dep

th (m

)

Elev

atio

n (m

)

Cla

ssifi

catio

n

Sy

mbo

l

DESCRIPTION OF MATERIAL

FDT

No.

Sam

ple

Type

/ N

o.

Remarks

< 6

6 - 2

0

05-05-2013 05-05-13 Logged By:

PROJECT'S NAME SHIGO KAS HYDROPOWER PROJECT

Client: PHYDO Electra Consultants

Jan Muhammad

TP-01


G.Elevation

TESTPIT LOG Testpit No.

645.59 Final Depth:

Date from:

Upstream of Weir Site from 450 M Left Bank

-

the material observed in the

walls of pit.

1.6

1.8

2.0

1.2

1.4

BOTTOM OF TESTPIT

117

Sheet 1 of 1

Location:

Coordinates 3090186 G.W.EL. 1.43 m

Consultants:

1

All four walls of the test pit are

showing same properties of

lithology. Composite sample has been taken for

the required laboratory tests.

The material excavated from

the Pit is representative of

the material observed in the

0.4

0.6

0.8

Stif

f

1.0

Lege

nd Grain Size (cm)

0.0

0.2

Silty sand/sandy silt, little brownish but dominantly greyish in colour is observed from top to 0.35 m. Sand is mostly medium grained and dry. From 0.35 m to 1.43 m, gravels and sub-rounded to rounded, boulders

alongwith silty sand/sandy silt has been observed. Boulders and gravels are of igneous and metamorphic origin, having different sizes and

colours. The overall conditions of the pit walls are dry. Biggest boulders observed is of size 0.65x0.45 m approximately.

Boulders with sandy gravels. Boulders are more than 50% along all the walls of testpit. At left wall a big boulder is present greater than 0.6X1m. Sand is fine to medium grained with coarse concretion. Gravels grain

size are medium to coarse grained. Over all colour of material is brownish, light greyish. Highly weathered boulders are dominant at base.

Sam

ple

Type

/ N

o.

20 -

60

> 60

Soft

Unit in meter

Dep

th (m

)

Elev

atio

n (m

)

Cla

ssifi

catio

n

Sy

mbo

l

DESCRIPTION OF MATERIAL

FDT

No.

Logged By:

N: 1171558 E:

PROJECT'S NAME SHIGO KAS HYDROPOWER PROJECT

Remarks

Consistency

Firm

G.Elevation

< 6

6 - 2

0

Client: PHYDO Electra Consultants

Jan Muhammad

TP-05


06-05-2013 06-05-13

TESTPIT LOG Testpit No.

652.13 Final Depth:

Date from:

Borrow Area U/S of Weir

-

observed in the walls of pit.

BOTTOM OF TESTPIT1.6

1.8

2.0

1.2

1.4

Walls of the testpits were collapsed due to loose sandy material. and boulders are randomly distributed along all the walls.

118

BH-01BH-01 2BH-01 3BH-01 4BH-03BH-03 2BH-03 3TP-01TP-05

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