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Yan Oya Reservoir Project

Environmental Impact Assessment

Final Report

Volume II Annexes

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Project

Project Name : Yan Oya Reservoir Project

Project Proponent : Ministry of Irrigation & Water Resources Management

(MI&WRM)

Project Approving Agency : Central Environmental Authority

Report Requirement : EIA

ABBREVATIONS AND ACRONYMS

ABOP - Air Blast Over Pressure

ACADD - Assistant Commissioner of Agrarian Development Department

ACV - Aggregate Crushing Value

AIV - Aggregate Impact Value

BS - British Standard

BTL - Bund Top Level

CEA - Central Environmental Authority

CECB - Central Engineering & Consultancy Bureau

DBH - Diameter at Breast Height

DSD - Divisional Secretary Division

EIA - Environmental Impact Assessment

EIRR - Economic Internal Rate of Return

FSL - Full Supply Level

GND Grama Niladhari Division

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TEC - Technical Evaluation Committee

TOR - Terms of Reference

US EPA - United State Environmental Protection Agency

WHO - World Health Organization

WRB - Water Resources Board

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Table of ContentsAnnex I: Geology ............................................................................................................................................................. 5

Annex II: Hydrology & Hydrogeology ................................................................................................................... 29

Annex III: Sociology ....................................................................................................................................................... 46Annex IV: Air Quality, Noise & Vibration .............................................................................................................. 59

Annex V: Flora & Fauna Ecology ............................................................................................................................. 67Annex VI: Program and Minutes of the First Meeting ..................... ..................... ...................... .................. 106

Annex VII: Participants of the Field Visit & Some Photos .................................... ...................... .................. 110

Annex VIII: Recommendations of Archeology Report ..................................................................................... 114

Annex IX: Terms of Reference .................... ...................... ...................... ...................... ..................... ..................... 120

Annex X: References ...................... ...................... ...................... ...................... ..................... ...................... .............. 130

Annex XI: Sources of Data & Information .................... ...................... ...................... ..................... ..................... 134

Annex XII: List of Prepares Including Their Work Allocation ...................... ..................... ..................... .... 136Annex XIII: Comments Made by the Public, NGOs & Other Agencies during Formal & Informal

Scoping Meetings Held by the EIA Team ...................................................................................... 140

Annex XIV: Complete Set of Relevant Maps, Tables, Charts, ...................... ..................... ...................... ....... 142

Layout Plans & Other Details ............................................................................................................. 142
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A I G l

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ANNEX (I-I)

Geological Aspects in and Around the Areas Covered by Project Related

Structures

Geological Aspects of Main Dam Axis (Refer Figures 3.1.2.1B to 3.1.2.1M)

Yan Oya main dam is proposed between Yakini Kanda and Veherabendi Kanda. Yan Oya

valley in the area of proposed main dam axis (between Yakini Kanda and Veherabendi

Kanda) is somewhat symmetrical, flat bottomed and U shaped. Width of the valley

from left bank to right bank is about 2.5km. The steepness of abutment slope on left

bank (Yakini Kanda) is 450 500while that of right bank (Veherabendi Kanda) is 35 0

400. Both abutments are strike ridges and right bank ridge runs sub parallel to the river

and left bank ridge is located with an angle of about 450 to 600.

An Archaeological site is located within the northern top section of the Veherabendi

Kanda ridge structure (Plate 3.1.2.1.1). Therefore, when conducting construction workof the project within the Veherabendi Kanda, action will have to be taken to avoid any

impacts to this archaeological site.

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- Overburden Cover

Drill holes (DH 24, DH 25, DH 26 & DH 06) along the main dam axis observed a thick

layer of alluvial bed, throughout the valley. Recorded maximum thickness of the alluvial

bed in the drill holes is 12.5m. Thickness of alluvial layer towards both abutments

decreases.

Based on composition, colour, grain size and bedding, the alluvial materials found in the

Yan Oya valley along the main dam axis can be divided into two units. The first unit is

the upper layer, which consists of black to dark brown high plastic organic clay withlenses of clayey silt / clayey sand.

This clay layer may have been formed under conditions of stagnant water in pools

within the flood plain or by sedimentation of suspended organic matter with the

detritus material over the flood plain.

The second unit which is the lower layer, consists of bands and lenses of

undifferentiated light grey or light brown clayey silt or clayey sand or very fine sandy

silt with occasional thin bands if gravel.

In comparison to top unit, in the lower layer, content of organic matter is very much

less. The upper layer is plastic and impermeable while the lower layer is mostly

bl d l ti ith l l ti it

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Orientation of foliation changes gradually from left bank to right bank. On left bank,

foliation is towards NW direction and in right bank the foliation changes towards east.

Geological Aspects of Spillway Area (Refer Figures 3.1.2.1N to 3.1.2.1P)

Saddle between Veherabendi Kanda and Galbuddha Kanda was selected for

construction of spillway in the pre-feasibility stage. The maximum height of

Veherabendi Kanda is around 65m and Galbuddha Kanda has not surveyed upto the top

of the hill but height can be assumed to be around 70m. Average slope of both hills isabout 35 - 40. The width of the valley is about 550m. Three axis were selected for

investigations. Axis I is from Veherabendi Kanda and Galbuddha Kanda through a low

outcropping rock exposure (in the middle of the saddle total length of spillway is 670m)

and the axis II and axis III are directly connecting two hills (width 550m).

Both hills are elongated strike ridges and elongation take place towards NE direction.

Other notable feature is that the Veherabendi Kanda ridge is divided into two peaks and

minor saddle between two peaks is reaching the height of 45 a.m.s.l. It seems that this

saddle has been created by the influence of a fracture zone. Both hill tops as well as

slopes are covered with rock blocks detached along open joints and some boulders may

be transported along the slope for several meters. Thickness of the loose boulder cover

is upto 10m and size of the boulders varies from 1m upto 5m.

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valley, shows weathering upto a depth of l4m. In other drill holes moderately weathered

rock is observed at the depth of 5 - 8m. Strike of the foliation is towards NE direction

and dip angle varies from 500to 600towards NW direction.

Two joint sets were observed. Both joint patterns striking oblique to spillway axis and

direction is towards SW and NE. Dip angles are sub-vertical and joints are mainly tight

or filled with a secondary material in most cases silica / carbonate. According to field

observations, Pansalkanda Saddle between two peaks probably formed with the

influence of above fracture zone. It seems that at the lowest area of the valleyintersection of a set of closely spaced foliation joints with some fracture zone create a

deep weathered zone to a depth of 14m. This deep weathering is observed in drill hole

No. DH 31 which is located in Spillway Axis 1.

Weathering along the Axis II is moderate and reaches a maximum depth of 7 - 8 m to

reach moderately weathered rock.

Considering the Hydraulic conditions, proposed axis III seems to be better than Axis II

and Axis I. Engineering Geological condition also can be assumed to be slightly better in

Axis II.

Preference in selecting the spillway axis will be given to the axis where foundation

ti b t d t b i i I thi t t A i III i f d

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40.434m a.m.s.l. completely weathered rock is anticipated upto a elevation of 36.0m

a.m.s.l.

Saddle Dams on Right Bank

Saddle dam II is selected between Galbuddha Kanda and Labukanda. Due to

unfavourable security conditions and presence of Mahasorowwa tank which was filled

to its full capacity, investigations for saddle dam II was limited to three drill holes DH11,

DH12, DH13 and few test pits. Field mapping and results of test pitting and drilling

show that the major rock types encountered in the area are charnockitic gneiss andquartzo feldspathic gneiss. Lowest elevation between Labukanda hill range and

Galbuddha Kanda is expected to be 26m a.m.s.l. Both hills rises to its peak elevations at

Left and Right abutments of the saddle dam and highest elevations are expected to be

52m a.m.s.l. for Labukanda and 65m a.m.s.l. for Galbuddha Kanda. Mailewa Kanda

(elevation 75m a.m.s.l. covers a large area on extreme right abutment of saddle dam III

and consist mainly of massive and hard quartz-feldspathic rock mass. Results of drilling

is shown in bore hole logs of DH 11, DH 12, DH 13. Results of test pits are shown in test

pit logs LKD I, LKD 7. Deep weathering is expected to be at DH13 (upto a depth of l4m)

and DH12 (upto a depth of l2m). Rock in the area where DH 13 is located probably

highly influenced by a fracture zone or it may reflects the nature of deferential

weathering which has a bearing on to the difference of composition of two rock type. In

addition to Residual Soil and completely to highly weathered rock along the saddle dam

i II i f l ti f h t l k d it l t d ith thi k f 2

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Left Bank Main Canal will feed 400Ha, existing Wahalkada Irrigation Scheme, 620 Ha of

Meeoya Scheme, Yan Oya Anicut lands, other lands under command along the canal and

finally will feed Jayanthiwewa.

Canal Intake Structure

Left Bank canal is connected to the reservoir by means of a short tunnel (about 78m

long), driven through Yakinikanda ridge. Top elevation of Yakinikanda ridge is 65 m

a.m.s.l. and the connecting tunnel inlet is at an elevation around 27m. Core of this ridge

is made up of jointed hard charnockitic gneiss. Joints are mostly parallel to the directionof foliation. Drill hole no. 23A and 23B are located at the beginning and at the end of the

connecting tunnel. Hill slopes are covered with completely weathered rock and residual

soil overlain by a boulder (talus) layer. Thickness of this layer is 2 - 4m.

Holes drilled at the peak of Yakinikanda hill and (DH 23) dam abutment show that open

joints or jointed rock with clayey material filling extends to a depth of 18 m. Due to

presence of detached or separated rock blocks tunnel intake and outlet structure have

to be supported with steel ribs during excavation period in order to ensure safe

working conditions during tunneling. After the entrance, about 10 - 20m from both

ends will have to be excavated with immediate support measures and such as wire

meshing, shotcreting, rock bolting. Core of the Yakinikanda hill consist of hard rock

mass with joints filled with secondary material such as silica or calcite.

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- Residual Soil and Completely to Highly Weathered Bed Rock

Reddish brown or yellowish brown residual soil consist of silty clay or clayey sand and

covers most part of the area as a superficial deposit with thickness varying from 2 to

4m. At places the same layer consists of reddish brown highly quartzitic clayey gravel or

slightly clayey gravely sand with low plasticity but high permeability.

Below the residual soil layer, weak completely weathered rock is found. Highly

weathered rock layer which occurs below the completely weathered rock requires

blasting during excavation. At some places this layer is represented by yellowish brownsilty sand or silt.

- Hard Rock Formation

The hard rock mass along the canal trace is represented by quartzite, quartzo

feldspathic gneiss, charnobkite, chamockitic gneiss and hornblende biotite gneiss rocks.

Out of these rock types, charnockite and charnockitic gneiss takes the dominant part.

Material available along the canal trace can be grouped as shown in the table below

according to the excavation technique involved in execution of canal excavations.

At Mee Oya, where an aquaduct is planned, no rock exposures were observed. However

about 100m from the crossing point towards upstream, a rock exposure is observed. At

the location of the structure, rock is expected to be available at a depth of 3-5m. Due to

it d ill h l ld t b t d t thi l ti It i d t

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ChainageAreas with Earth Excavations where no Rock

blastingis involved

Areas with rock and

earth excavations where

rock blasting is involved0.0 to 1.0

1.0 to 2.0

2.0 to 3.0

3.0 to 4.0

4.0 to 5.0

5.0 to 6.0

6.0 to 7.07.0 to 8.0

8.0 to 9.0

9.0 to 10.0

10.0 to 11.0

11.0 to 12.0

12.0 to 13.0

13.0 to 14.0

14.0 to 15.0

15.0 to 16.0

16.0 to 17.0

17.0 to 18.0

18.0 to 19.0

19.0 to 20.27

0.000 - 1.000

1.000 - 2.000

2+000 - 2+170, 2+560-3.000

3+000 - 3+830

4+250 - 5+000

5+000 - 5+250

6+900 - 7+0007+000-7+225, 7+650-8.000

8+000 - 9+000

9+000-9+500, 9+920-10+000

10+000 - 11+000

11+000 - 12+000

12+000-12+150, 12+290-13+000

13+000 - 13+790

14+110 - 15+000

15+000 - 16+000

16+000 - 16+525

17+020 - 18+000

18+000 - 19+000

19+000-19+600, 19+800-20+270

-

-

2+170 - 2+560

3 + 830 - 4+000

4+000 - 4+250

5+250 - 6+000

6+000 - 6+9007+225 - 7+650

-

9+500 - 9+920

-

-

12+150 - 12+290

13+790 - 14+000

14+000 - 14+110

-

16+525 - 17+000

17+000 - 17+020

-

19+600 - 19+800

It i d t t t t li d l f M i d B h C l d

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Annex (I-II)

Special Features of the Identified Burrow Sites

Borrow Area I

Most of this Quartzite ridge is on the upstream of the Wahalkada settlement area and

considerable number of houses, a school and number of boutiques will have to be

relocated to clear the complete area. The topography of the area gradually rises from

the road level and therefore self draining condition could be easily maintained during

exploitation. The dominating soil consists of reddish gravelly clay. In most of the testpits the presence of highly gravelly material within first 0.5 meters is very clear. This

may be due to surface drainage. But it reduces with the depth and beginning of SC-GC

soils is clearly visible. Due to easy access and the presence of GC/SC material in bulk,

this gravelly ridge is preferred to other areas as a borrow area. All of left Bank and

partly of Right Bank fill materials requirements could be exploited from this area. The

highly gravelly top material (GW) which has to be removed to exploit the GC/SC

material could be economically used for the construction of access roads, needed for the

project.

Due to the presence of Wahalkada D-2 School, Wahalkada D-2 junction with few

boutiques and number of houses, only a section of the quartzitic gravel ridge structure

is recommended for excavation. This proposed section of Borrow area is shown in

Fi 3 1 2 1Q

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Borrow Area 4 (Right Bank)

This area too is within the reservoir bed and the demarcated outer edge is

approximately 1 km from the Dam axis. Part of Mahasorowwa tank and its settlement is

within this area. Abandoned chena cultivation and shrub jungles are common features

of this area.

There are some indications that this area too would be of alluvial deposit. The

dominating soil group is SM yellowish soil. The pangurugaswewa Mahasorowwa road

runs through this borrow area.

Borrow Area 5 (Right Bank)

This area is situated downstream of Dam axis. The proposed spillway is also located in

this area. The reddish SC/GC material and yellowish SC material are the dominating soil

groups. This area is covered with thick jungle and the area close to the river consists of

an alluvial deposit. Bulk of the excavated soil (over 90%) from the construction of

spillway could be economically used for the embankment construction works.

Water Table Variations

Water table was not observed in any of the test pits in borrow areas 1 to 5. There were

no indications of water table even after the rainy season. Therefore expected exploitable

volumes of earth will not be affected by water table variations.

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SC Material

SC material is widely distributed in borrow area 3 and 5. It is generally reddish brown

in colour and is composed of 8 to 25 percent of clay, 5 to 30 percent of silt, 15 to 80

percent of sand and, 5 to 50 percent of gravel content. The specific gravity of soil

particles is about 2.5. The soil is plastic with a plasticity index between 11 to 30 percent.

The compaction of se material is extremely good with a dry density of 1.8 - 2.2 t/m3

within a range of 3 percent of the optimum moisture content. The optimum moisture

content is about 11 percent and is slightly on the wet side of the field moisturecontent.SC material is very impervious and the cofficient of permeability is around 10-7

cm/sec.

SC/SM and SM Material

This material is widely distributed in borrow areas 2 and 4 which consists of Aluvial

deposits. It is generally yellowish brown in colour.

They are composed of 2 to 10 percent clay, 10 to 36 percent silt, 28 to 80 percent sand

and 5 to 50 percent gravel content. The dry densities are about 1. 9 t/m3 and optimum

moisture content is about 12 %.

The coefficient of permeability is around 10-8cm/sec and the compression tests show

l f i l f i i f d 27 d h i C1 f 26 k

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The cell pressures used for each set of testings were 150, 250 and 350 kpa. The rate of

shearing was controlled in the drained tests so that the pore water pressure generated

at the bottom of the samples was less than 10% of the applied cell pressure.

Sample

No.

Borrow Area CD Test UU Test

C (kpa) O deg. C (kpa) O deg.

A2

D2 / B2

T P2

HPB

LKD 4

LKD 6

1 (LB)

1 (LB)

Near 2 (LB)

3 (LB)

Near 4 (RB)

Near 4 (RB)

43.1

66

37.7

26.6

46.3

43

22

34

21.8

32

24

33

5

339

37*

19

These results are being discarded as they do not appear compatible and more tests on

samples will be done on a wide spread basis during construction.

Exploitable VolumesBorrow

Area

Location Topographical

Levels m.a.s.l

Dominating

Soil Group

Approximate

Exploitable

(Area km2)

Productive

Depth m

Exploitable

Volume

MCM

Natural

Degree of

Compaction

Effective

Exploitable

Volume

(MCM)

1

2

3

L.B.

L.B.

R.B.

25-50

28.30

30-40

SC/GC

SC

SC,SC/GC

4

2

3

1.5

2

2

6

4

6

85% (A2)

93.5%

(B10)

5.1

3.74

4

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Unit

Left Bank +

500 m of

Right Bank

Rest of he

Right Bank

Optimum Moisture Content

Maximum Dry Density

Average Bulk Density

Effective Cohesion C'

Effective Angle of FrictionUndrain cohesion

Undrain Angle of Friction

Coefficient of Permeability

%

kN/m3

kN/m3

kpa

degkpa

deg

cm/s

10

19.62

22.56

15

225

19

10-4

11

19.62

21.58

15

225

19

10-7

Summary

Construction material investigations at Yan Oya valley could be summarised as

indicated below. Availability of construction material in adequate quantity, quality and

also in economic haul distances are in favour of a homogenious earthfill dam to be

constructed in Yan Oya valley at Pangurugaswewa.

Group

Symbol

Description Permeability

when compacted

Shear Strength

when compacted

& saturated

Compressibility

when compacted

& saturated

Workability as

construction

material

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ANNEX (I-III)

Structural Features in and Around the Areas Covered by Project Related

Structures

StructuralFeatures along the Dam Axis

During field mapping, an overturned fold was identified along the dam axis. Axis of this

structure lies towards NE direction. This fold system is dissected by an NW or N

oriented pattern of intensively jointed zones. According to field evidence in these zones

joints are closely spaced. Along these zones rock is highly tectonized (DH 24, DH 25, DH26). These fracture zones appear to be part of a lineament. This lineament can be traced

in aerial photographs to a distance of 2-5 km. Most of the joint planes are slickensided

and shows movements on joint plain on different directions.

Orientation of foliation changes gradually from left bank to right bank. On Left bank

direction of foliation is towards NW and on Right bank direction changes towards E.

Changes of foliation direction is quite regular as can be seen from the stereograph a plot

and foliation angles change from 70 - 80 on left bank to 55 - 65 on right bank.

Two joint sets were observed at the dam site area. Joint set 1 is sub-parallel to the dam

axis and dip is at steep angles 80 - 85 towards downstream. This joint set is parallel to

above mentioned system of fracture zones. This joint set is well pronounced in the river

i b 500 b l h d i A i l i f h j

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Structural Features along the Saddle Dams

Two drill holes (DH 28 and DH 30) have been executed on left bank at Yakinikanda hill

range which is the continuation of left bank main dam abutment. Rock encountered in

both drill holes is hard charnockitic gneiss. But two fractured or deeply weathered /

altered shear zones represented by joint set II (which is common to dam site too) are

crossing through the major hill range from upstream to downstream. These saddle

points are due to the influence of same. Deep weathering encountered along the

fracture zones. along which subsequently erosion has taken place, made the ground

elevations lower than the expected H.F.L.

Structural Features of Canal Intake and Canal Trace

Canal is connected to the reservoir by means of a short tunnel (about 78m long) driven

through Yakinikanda hill ridge. Top elevation of Yakinikanda hill is 65 m a.m.s.l. and the

connecting tunnel inlet is at an elevation around 27m. Core of this hill ridge is made up

of jointed hard charnockitic gneisses. Joints are mostly parallel to the direction of

foliation. Drill hole no. 23A and 23B are located at the beginning and end of the

connecting tunnel. Hill slopes are covered with completely weathered rock and residual

soil overlain by a boulder (talus) layer. Thickness of this layer is 2 - 4m.

Holes drilled at the peak of Yakinikanda hill and (DH 23) dam abutment show that open

joints or jointed rock with clayey material filling extends to a depth of 18 m. Due to

f d h d d k bl k l i k d l h

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ANNEX (I-IV)

Laboratory Tests Carried Out for Samples Collected from Identified Burrow Areas

All the field tests and laboratory tests, except the triaxial tests were conducted by the

staff of the material testing laboratory of the CECB at Adikarigama. The triaxial tests

were conducted at the University of Peradeniya.

The following tests for the samples from borrow areas 1 to 6 were performed.

100 - Grain size distribution

95 - Atterberg limits

95 - Proctor Compaction

04 - Initial Natural Moisture Content Tests

71 - Permeability Tests (at 95 % of Heavy proctor Compaction)

06 - Triaxial Drained Tests (CD)

02 - Triaxial Undrained Tests (UU)

Also few field density tests were carried out using solid cone in each borrow area to

calculate the effective exploitable volumes.

Standards Used For Testing

BS 1377 (1975) - Soils for Civil Engineering Purposes

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EIA Study Final Report

Details of Identified Burrow Areas (Refer Fig. 3.1.2.1Q for their Locations)

BORROW

AREA

LOCATI

ONTOPOGRAPHY

ACCESSIBILIT

Y

OWNERSHIPAND

LANDUSE

AVG.

THICKN

ESS OFEXPLOS

IBLE

LAYER

(m)

NO.

OFTES

T

PITS

THICK

NESS

OF TOP

SOIL

LAYER

(m)

REMARKS

1

Down

Streamof

Dam

Left

Bank

High ground

with levelvariation

between 25msl

to 50msl

Close to

Wahalkadatown,

settlement

& School

Crown land/ private

land. About 20

Human settlements

and some partecualpytus

plantation. In the

selected section for

burrow pit, no

disturbances were

observed

2.5 16 0.2

In most

places the

top layer istoo gravally

(9W but clay

% increases

with depth)

2

Up

Streamof Dam

Left

Bank

Reservoir bed

area. Flat groundand level varies

from 28msl to 30

msl

Close to

WahalkadaSettlement

and direct

access from

Wahalkada

Crown landpartly paddy

cultivation

2 10 0.2

This area is

under theinundation

level of

average flood

Up

Stream

f

Reservoir bed

area. Scattered

h h d h

Close to the

Dam. Access

l bl

Crown land small

b h l 5

Proposed

Right Bank

rock quarry

l d

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Annex (I-V): Rock Mass Classifications Used in the Study and their Results

Table 3.1.2.3

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24

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Table: 3.1.2.3.B: Yan Oya Padaviya Agricultural Extession Project -Point Load Test

Results

Hole

No.

Depth Rock

Type

Weathering Moisture Test

type

Diameter Gauge

Pressure

Point

Load

Index

U.C.S

(m) (cm) Kg/cm2 Kg/cm2 Mpa

DH 27 14.32

14.44

14.50

14.6815.36

22.43

22.60

22.75

22.66

2288

22.30

22.40

23.53

23.64

24.07

24.25

CH

CH

CH

CHCH

Q.F.G.

Q.F.G.

Q.F.G.

Q.F.G.

Q.F.G.

Q.F.G.

Q.F.G.

Q.F.G.

Q.F.G.

Q.F.G.

Q.F.G.

Fr

Fr

Fr

FrFr

Fr

Fr

Fr

Fr

Fr

Fr

Fr

Fr

Fr

Fr

Fr

Dry

Dry

Dry

DryDry

Dry

Dry

Dry

Dry

Dry

Dry

Dry

Dry

Dry

Dry

Dry

D

D

D

DD

D

D

D

D

D

D

D

D

D

D

D

5.4

5.4

5.4

5.45.4

5.4

5.4

5.4

5.4

5.4

5.4

5.4

5.4

5.4

5.4

5.4

220

240

230

220240

150

220

210

160

125

140

100

90

150

110

150

108.84

118.73

113.79

108.84118.73

74.21

108.84

103.89

79.16

81.84

69.20

49.47

44.52

74.21

54.42

74.21

261.21

284.96

273.08

262.21284.96

178.10

261.21

249.34

189.97

148.42

168.23

118.73

106.86

178.10

180.81

178.10

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DH 11

DH 26

22.17

14.87

15.03

41.27

41.46

41.59

41.93

H.B.G.

Q.F.G.

Q.F.G.

CH

CH

CH

CH

Fr

Fr

Fr

Fr

Fr

Fr

Fr

Dry

Dry

Dry

Dry

Dry

Dry

Dry

D

D

D

D

D

D

D

5.4

5.4

5.4

5.4

5.4

5.4

5.4

150

155

175

225

240

235

240

74.21

78.89

86.58

111.31

118.73

116.26

118.73

178.10

194.04

237.78

267.15

284.96

279.02

284.96

H.B.G. Hornblend Biotite Gneiss Fr Fresh Rock

Ram Area 14.426cm2 D Diametral Test

D.F.G. Quartz Feldspar Granulites/ Quartzite

CH Charnockiten Gneiss / Charnockite

U.C.S. Uniaxial Compressive Strength

Annex (I-VI): More details about the Distribution and Thickness of Soils in and

around the Project Related StructuresDistribution and Thickness of Soils along the Dam Axis

Drill holes on old axis (DHI, DH2, DH3, DH4) as well as new axis (DH 24, DH 25, DH 26,

DH 6) show a thick layer of alluvial deposits throughout the valley. Recorded maximum

thickness of the alluvial layer is 12.5m on (DH 25) on new axis and 8.75m (DH4) on old

axis. Towards both abutments thickness of alluvial layer decreases.

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Distribution and Thickness of Soils along the Spillway Area

Along both axis of Spillway in the lower part of the valley a layer of residual soil and

completely weathered rock is overlying the bedrock layer. In addition to that a layer of 2

- 3 in thick alluvial layer was observed in test pits except in axis I. This layer extends

only upto Spillway axis II and axis III. Alluvial deposits mainly consist of organic clay,

clayey silt, silty clay or clayey sand. Presence of silica/Carbonate concretions also

observed.

Distribution and Thickness of Soils along the Canal Trace

Along the canal trace a series of test pits were executed (for logs of pit see Annex D). Soilformation identified are alluvial soils and residual soils.

Alluvial deposits are present in ancient tank beds, stream beds and in the flood plain of

minor streams. These deposits consist of organic clay, clay silt, silty sand and medium to

coarse grained sand Thickness of this layer expected to be in the region of 0 3m.

Reddish brown or yellowish brown residual soil consist of silty clay or clayey sand and

covers most part of the area as a superficial deposit with thickness varying from 2 to

4m. At places the same layer consists of reddish brown highly quartzitic clayey gravel or

slightly clayey gravely sand with low plasticity but high permeability.

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pressures with raising and lowering the pressures. Calculated values by direct

proportions were indicated in drill hole logs. When considering the method of selected

value for the stage under test it is suggested to be predominantly laminar flow in the

fine crack openings and in most of the cases values are less than 3 lugeons. Drill hole DH

25 is drilled through a fracture zone where R.Q.D. is between 25 - 75. At this particular

location rock is tectonized and lugeon values are between la and 15. This zone might

extent 50m to both sides from drill hole. In addition to above method for all drill holes

where water pressure tests have been conducted P. Q. graphs also were drawn and

calculated lugeon values were calculated according to this method.

With above results of water pressure testing, grouting can be limited to individual

previous zones as those intercepted in drill hole DH 24 and DH 25. Number and location

of such zones are not known whereas their orientation can be assumed as that of major

lineament. These areas should be treated with blanket grouting with holes placed in a

3m grid to cover the entire zone in cutoff trench. This zone could be identified after

excavating the cut-off trench and blanket grouting should cover a depth of 5 - 10 mdepending on the Lugeon Value. There is no necessity for curtain grouting as such due

to the reason that water pressure tests have not indicated high Lugeon Values except in

the fracture zones mentioned above. Influence by induced Hydrostatic pressure due to

construction of the reservoir which is in the region of 2 - 3 bars will not create much

problem, in the expected low yield zone below the impermeable cut of trench with

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Annex II: Hydrology & Hydrogeology


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30

Annex II: Details of the inspected dug wells in the Yan Oya Project area.

Well

number

GPS

Coordinate

Location/

Ownership

Well

depth(m

)-bgl

Standing

groundwater

level(m)-bgl-

10/11/2011

Groundwate

r level in dry

period

(m)-bgl

Groundwate

r level in wet

period

(m)-bgl

Remark

DW1 213585 E,

395404 N

Common well 3.90 0.5 2.90 0.20 Dug up to moderately weathered

formation. Used for drinking and other

purposes.

DW2 213542 E,

395389 N

Common well 4.90 0.20 3.90 Ground level Dug up to moderately weathered

formation. Not used for drinking.

DW3 213507 E,

395589 N

Common well 5.60 0.70 4.60 0.5 Close to paddy field. Dug up to moderately

weathered formation. Used for all

purposes.

DW4 213553 E,

395231 N

Common well 4.50 0.2 3.40 0.2 Used for drinking and other purposes.

Dug up to moderately weathered

formation.

DW5 213555 E,

395035 N

Common well 6.4 1.45 6.10 0.65 Dug up to moderately weathered

formation. Used for all purposes.

DW6 213718 E,

393626 N

Common well 7.0 No water No water 4.5 Completely lined up to rock level.

DW7 213648 E,

393406 N

Common well 7.40 6.75 No water 3.75 Dug up to bed rock. Seasonal well.

DW8 213745 E,

393236 N

Common well 6.05 4,75 No water 2.70 Dug up to moderately weathered rock

DW9 213765 E,

392951 N

Common well 6.85 4.45 6.70 0.55 Lined up to rock level.

DW10 213699 E,

392725 N

Common well 7.65 4.45 7.35 0.2 Used for drinking. Dug up to moderately

weathered rock.

DW11 213236 E, Common well 5.5 3.5 5.3 1.20 Dug up to moderately weathered rock..


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31

392911 N

DW12 213424 E,

392995 N

Common well 5 2.75 4.70 0.2 Dug up to fractured rock.

Annex II(continue)Well

number

GPS

Coordinate

Location/

Ownership

Well

depth(m

)-bgl

Standing

groundwater

level(m)-bgl-

10/11/2011

Groundwate

r level in dry

period

(m)-bgl

Groundwate

r level in wet

period

(m)-bgl

Remark

DW13 213544 E,

392454 N

Common well 4.40 0.7 No water 0.6 Dug up to rock level. Seasonal well.

DW14 213618 E,

392261 N

Common well 4.3 0.7 2.3 0.3 Dug up to rock level. Used for drinking

purposes.

DW15 213862 E,

391635 N

Common well 6.60 3 5.60 0.2 Four pumps for four houses. Used for

drinking and other purposes.DW16 213922 E,

391669 N

Common well 6.50 2.40 6.0 0.8 Three meters dug in rock formation.

DW17 213902 E,

391494 N

Common well 7.4 5.10 7.10 0.5 Dug up to rock level. Used for drinking

and other purposes.

DW18 213650 E,

391633 N

Agro well-private 6 1.6 4.8 0.2 Abandoned well due to elephant

problems.

DW19 214725 E,

389615 N

Common well 7.30 1.70 6 0.2 Dug up to moderately weathered rock.

DW20 214825 E,

389179 N

Common well 8.30 4.7 8 1.8 Dug up to rock. Used for drinking.

DW21 214532 E,

389477 N

Common well 7.2 2.5 No

information

0.2 Abandoned well. Close to paddy field.

DW22 216136 E,

386679 N

S. Kiri Banda,

Kibulpitiyawa,

5.2 0.6 3.2 0.3 Used for drinking. Dug up to moderately

weathered rock.


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32

Gomarankadawala.

DW23 216265 E,

386633 N

D.B. Kiri menika,

Kibulpitiyawa,

Gomarankadawala.

6.8 2.9 4.8 1.20 Dug up to moderately weathered rock.

Used for drinking and other purposes.

Annex II(continue)

Well

number

GPS

Coordinate

Location/

Ownership

Well

depth(m

)-bgl

Standing

groundwater

level(m)-bgl-

10/11/2011

Groundwate

r level in dry

period

(m)-bgl

Groundwate

r level in wet

period

(m)-bgl

Remark

DW24 216318 E,

386580 N

S. Sirisena,

Kibulpitiyawa,

Gomarankadawala.


DW25 216335 E,

286576 N

Nandasena,

Kibulpitiyawa,Gomarankadawala.

5 2.5 4.3 Ground level Dug up to moderately weathered

formation. Used for drinking and otherpurposes.

DW26 216456 E,

386877 N

U.B. Chandrasena,

Kibulpitiyawa,

Gomarankadawala.

6.4 3 5.1 0.2 1.5 meters in fractured rock formation.

Used for drinking and other purposes.

DW27 216272 E,

386747 N

R.H Dissanayake,

Kibulpitiyawa,

Gomarankadawala.

8.1 3.9 No water 2 Not for drinking.

DW28 216233 E,

386779 N

Common well 9.2 4.9 8.6 1.1 1.3 m in fractured rock formation

DW29A 216516 E,

387039 N

Common well 6.6 2.8 6 0.9 Dug up to rock level. Used for drinking.

DW29 210669 E,

393168 N

P.Karunarathna,D-

1,Wahalkada.

4.3 1.2 3.9 0.3 Dug up to fractured rock. Used for

drinking.


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33

DW30 210016 E,

391853 N

Common well 4.5 2.5 4.1 0.9 Bad construction and polluted.

DW31 210425 E,

391853 N

Agro well 5.4 3.4 No

information

0.9 Abandoned well.

DW32 210307 E,

393907N

Anura Jayampathi,

Wahalkada.

3.3 0.6 2 0.3 Used for drinking purposes. Close to

irrigation channel.

Annex II(continue)

Well

number

GPS

Coordinate

Location/

Owership

Well

depth(m

)-bgl

Standing

groundwater

level(m)-bgl-

10/11/2011

Groundwate

r level in dry

period

(m)-bgl

Groundwate

r level in wet

period

(m)-bgl

Remark

DW33 210193 E,

393807 N

Common well 4.8 0.6 No

information

0,2 Close to irrigation channel.

DW34 210480 E,394134 N

K.Liyasa, D-1,Wahalkada.

5.8 0.9 5.4 Ground level Two meters in rock formation. Not fordrinking..

DW35 210434 E,

394195 N

U. Mali,D-1,

Wahalkada.

6.4 2.6 5.4 0.1 Located at higher elevated ground. Used

for drinking.

DW36 210467 E,

394007 N

Private well 4.2 0.5 1.7 0.20 Close to paddy field.

DW37 210305 E,

393998 N

Private well 4.5 1.6 New well Ground level Dug up to moderately weathered

formation.

DW38 210169 E,

394006 N

A.Wimalasena, D-2,

Wahalkada.

7 4 6.7 1.7 Located at higher elevated ground.

DW39 205880 E,410180 N

Private well 5.4 2.6 1.8 0.4 Not for drinking.

DW40 205852 E,

409869 N

W.M Devid,16/38,

Jayanthipura,Padawiya

.

6.8 3.2 0.3 Dug up to rock level. Not for drinking.


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34

DW41 205874 E,

409415N

H.A Emalin,D-10,

Mitripura,Padawiya.

6.2 1.5 4.2 0.4 Dug up to rock level. Not for drinking.

DW42 206011 E,

409360N

K.M seneviratne,

648/D10, Padawiya.

9 6.4 8.6 0.3 2 m in rock formation. Used for drinking

purposes.

DW43 205777 E,

408994 N

N. Liyanage,656A/D10

Mitripura, Padawiya.

4.8 0.6 0.2 Dug up to moderately weathered rock.

Located close to paddy field.

DW44 206435 E,

409346 N

H.M.Dayawathi,765,

Siwalipura, Padawiya.

9 4.9 8 2.8 Used for drinking purposes.

Annex II(continue)

Well

number

GPS

Coordinate

Location/

Ownership

Well

depth(m

)-bgl

Standing

groundwater

level(m)-bgl-

10/11/2011

Groundwate

r level in dry

period

(m)-bgl

Groundwate

r level in wet

period

(m)-bgl

Remark

DW45 206812 E,409247 N

J.M.A Sanjeewa,758,Siwalipura, Padawiya.

6 2.8 5.5 Ground level Agro well. Dug up to moderatelyweathered rock.

DW46 206669 E,

408757 N

Private well 4.4 0.7 0.2 Dug up to moderately weathered rock..

DW47 207229 E,

408841 N

W.M Somaweera,868,

Siwalipura, Padawiya


Not for drinking purposes.

DW48 206720 E,

408785 N

W.G. Piyadasa, 785,

Siwalipura, Padawiya

5.9 2.3 5.5 1 One meter excavated in rock formation,

Not used for drinking purposes.

DW49 207341 E,

409121 N

Private well 9.1 5.1 No water 3.0 Unprotected. Dug up to bed rock.

DW50 207959 E,409104 N

A.R Kusumawathi,LL70, Siwalipura,

Padawiya

7.4 4 6.9 0.5 Not lined. Four meters excavated inmoderately weathered formation. Used

for drinking.

DW51 207699 E,

409439 N

H.G.S.Gamini,

Jayanthipura,Padawiya

6.5 1.7 5.3 0.3 Up to rock level. Used for drinking

purposes.


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35

.

DW52 208525E,

408943 N

RJMD Jayasuriya,

Weliela, Daluggala,

Mahasenpura.

4.4 0.4 3 Ground level Dug up to rock level. Used for drinking

purposes.

DW53 208977 E,409474 N

KMN Kulatunge,Daluggala,

Mahasenpura

7.4 3.3 6.3 0.3 Three meters excavated in rockformation. Used for drinking purposes.

DW54 209019 E,

408315 N

Private well 5 2.4 No water 0.3 Unprotected. Not used for drinking

purposes.

DW55 208990 E,

407600 N

S.K Kumari,909,

Daluggala,Mahasenpur

a.

7 2.3 6 1.1 Dug up to rock level. Used for drinking

purposes.

Annex II(continue)

Wellnumber

GPSCoordinate

Location/Ownership

Welldepth(m

)-bgl

Standinggroundwater

level(m)-bgl-

10/11/2011

Groundwater level in dry

period

(m)-bgl

Groundwater level in wet

period

(m)-bgl

Remark

DW56 209992 E,

406901 N

JMB Manike,


a

5 1.6 No water 0.6 One meter excavated in rock formation.

DW57 209126 E,

406184 N

SB Puspa Kanthi,1213,


a

8.1 3.6 7.5 1.1 Three meters excavated in rock

formation. Used for drinking purposes.

DW58 210752 E,388225 N

PW Jayatissa,Kapugollewa.

8.1 5.9 6.4 0,1 Three meters excavated in rockformation. Used for drinking purposes.

DW59 210735 E,

388525 N

Private well 8 6.2 No water 2 Dug up to bed rock.

DW 60 210597 E, KG Jayalath, 5 2 4 0.1 Used for drinking purposes.


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36

388521 N Kapugollewa.

DW61 210546 E,

389293 N

Wijeratne,

Kapugollewa.

6.1 2.6 5.1 0.9 Dug up to rock leve.Used for drinking

purposes.

DW62 210446 E,

389281 N

5.5 1 Abandoned well.

DW63 210844 E,

389467 N

T. Jayatissa,

Kapugollewa

8.7 5.1 6 Ground level Dug up to moderately weathered


DW64 210879 E,

389974 N

B Pereis, Kapugollewa 6.3 3.3 4.7 0.3 Dug up to moderately weathered


DW65 210655 E,

389657 N

H. Weela, Kapugollewa 5.9 2 3.9 0.9 Dug up to moderately weathered


DW66 209566 E,

390268 N

Agro well 4 0.8 1 0.3 Dug up to moderately weathered

formation.

DW67 209124 E,

390332 N

U.B Dasanayake,

Puhudiula,Kapugollewa.

5.6 2.4 3.2 0.2 Agro well. Dug up to moderately

weathered formation

Annex II(continue)

Well

number

GPS

Coordinate

Location/

Ownership

Well

depth(m

)-bgl

Standing

groundwater

level(m)-bgl-

10/11/2011

Groundwate

r level in dry

period

(m)-bgl

Groundwate

r level in wet

period

(m)-bgl

Remark

DW68 208602 E,

388032 N

G. Kumari,

Alapaththewa,Pahaladi

ulwewa.

3.2 1.9 No water 1.0 Within paddy field. Not used for drinking.

DW69 208739 E,

388284 N

Common well 5 0.4 3 Ground level Used for drinking. Dug up to moderately

weathered rock.

DW70 209000 E,

388762 N

H. Mahindapala,

Alapaththewa


Used for drinking.


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37

DW71 209067 E,

389783 N

A.M Sunil,

Pahaladiulwewa,Kapug

ollewa.

4.5 2.5 4 Ground level Dug up to rock level. Not used for

drinking.

DW 72 208817 E,

390639 N

Aberathna, Pahala-

diulwewa,Kapugollewa

.

5.8 1.7 3.8 0.7 Used for drinking and agricultural

purposes (dry period).

DW73 209621 E,

390991 N

KD Jagath,Puhudiula,

Kabilithigollewa

4.3 2.5 4 0.2 Within highly weathered formation. Not

used for drinking purposes.

DW74 210286 E,

397996 N

Common well 8.2 3.1 5.4 0.9 Abandoned well due to terrorist activities.

Up to moderately weathered formation.

DW75A 210198 E,

397735 N

Common well 5.1 1.1 4.6 0.9 Abandoned well due to terrorist activities.

Within highly weathered formation.

DW75 210037 E,

397333 N

D-8 School 5.8 0.4 4.8 0.1 Used for all purposes.

DW76 207757 E,

397356 N

A Karunadasa, D-6,

Wahalkada.

4.4 1.6 4 0.2 Dug up to rock level. Used for drinking

purposes.

DW77A 208476 E,

396277 N

A Amasena, D-5,

Wahalkada.

4.8 0.8 3.8 0.5 Dug up to moderately weathered

formation. Used for drinking.

Annex II(continue)

Well

number

GPS

Coordinate

Location/

Ownership

Well

depth(m

)-bgl

Standing

groundwater

level(m)-bgl-

10/11/2011

Groundwate

r level in dry

period

(m)-bgl

Groundwate

r level in wet

period

(m)-bgl

Remark

DA77 207835E,396344 N

PJ Kumari,D-5,Wahalkada.

3.8 0.5 3.6 0.2 Used for drinking. Not dug up tomoderately weathered formation.

DW78 209022 E,

396230 N

R Ayttanayake,D-5,

Wahalkada.

4.1 0.8 2.4 0.2 Agro well. Dug up to moderately

weathered formation

DW79 208627 E, Common well 6.1 3.2 5 0.6 Up to bed rock. Used for drinking.


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38

396118 N

DW80 208791E,

395880 N

WK Gunasinghe, D-5,

Wahalkada.

5.3 1.4 4.3 0.2 Up to bed rock. Used for drinking.

DW81 209208 E,

395223 N

D Senanayake, D-4,

Wahalkada.

3.3 0.3 3.1 0.1 Close to paddy field. Not used for

drinking.

DW82 209151 E,

394908 N

A.S Bodinayake,D-4,

Wahalkada..

3.7 0.9 2.8 0.4 Dug up to rock level. Used for drinking.

DW84 209097 E,

392525 N

Private well 4.70 1 No water Ground level Within highly weathered formation. Not

used for drinking purposes.

DW85 210286 E,

397996 N

J Dhanapala, D-1,

Wahalkada,

6.2 1.9 4.2 1 Water used for drinking and agricultural

purposes.

Yan O a Reser oir Project

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Annex III: Sociology



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Annex III-Details of affected families (in inundation area)

List of -Dwellers who will be totally affected due to inundation of dwellings and agricultural lands.

District Trincomalai , D.S.Division Gomarankadawela , G.N.Division 223 A Pamburugaswewa, Village -Mahasorowwa

Serial

No.

Name of Head of House

Hold

Family

size

Main

Occupation

Irrigation

System

Land Within Inundation area

Paddy Land (Ac) Up lands(Ac)

Extend Ownership Extend Ownership

01 T.B.Duminda Ranganath 03 Farming Mahasorowwa 03 LDO Permit 0.5 LDO Permit

02 S.P.D.Premalatha 02 Laborer Mahasorowwa+

Hapatiyawa

2+1 LDO+ Encroached 01 LDO Permit

03 Laxman Piyatunga 03 Farming Mahasorowwa+

Rain Fed

2+8 LDO + Encroached 01 LDO Permit

04 S.P.Nanadawathi Kusumalatha 04 Farming Mahasorowwa 02 Encroached 0.5 Encroached

05 S,Nilanthi Siriwardana 03 Farming Mahasorowwa 02 Encroached 01 Encroached

06 S.P.Pathmasiri 01 Farming Mahasorowwa 02 Encroached 0.5 Encroached

07 S.P.Rathnayaka 01 Farming Mahasorowwa 02 Encroached 01 Encroached09 S.P.Nalini Keerthirathna 03 Farming Mahasorowwa 02 Encroached 0.5 Encroached

10 S.P.Keerthirathna 03 Farming Mahasorowwa 05 LDO Permit 0.5 Encroached

11 W.M.P.L.Disanayaka 01 Farming Mahasorowwa 02 Encroached 0.5 Encroached

12 S.Gunawardana 05 Farming Mahasorowwa 02 Encroached 0.5 Encroached

13 A.M.S.K.Abesingha 05 Govt.Sector Mahasorowwa 02 Encroached 0.5 Encroached

14 H.Darmadasa 02 Farming Mahasorowwa+Rain

Fed

3+3 Encroached 01 Encroached

15 W.P.Ariyadasa 04 Farming Mahasorowwa 2.5 Encroached 0.5 Encroached

16 S.P.Rupasingha 02 Govt. Mahasorowwa 02 Encroached 01 Encroached

17 W.P.Nimal Rathnayaka 04 Farming Mahasorowwa 02 Encroached 01 LOD Permit

18 H.Beebinona 01 Farming Mahasorowwa 02 Free hold 01 Free hold

19 W.P.Nirosha Priyadarshini 04 Privt.Sector Mahasorowwa 02 LOD Permit 02 LOD Permit

20 S.P.Gunaseekara 02 Farming Mahasorowwa

Rain Fed

2+3 Free hold

+Encroached

01 Free hold

21 K.M.Daramadasa 05 Farming Mahasorowwa 02 Free hold 1.5 Encroached



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22 K.M.S.L.Piyatunga 03 Govt.Sector Mahasorowwa 02 LOD permit 1.5 LOD permit

23 M.G.Ajith Jayasingha 06 Farming Mahasorowwa 03 Freeholder 02 Freeholder

24 S.Lasantha Suraweera 04 Govt.Sector Mahasorowwa 02 LDO Permit 0.5 LDO Permit

25 S.P.Gunarathna 06 Farming Mahasorowwa 05 Freeholder 01 Freeholder

26 S.P.Upali Dayanada 02 Farming Mahasorowwa 02 Encroached 01 Encroached

27 P.A.A.Nanda Kumara 06 Faming Mahasorowwa 04 Freeholder 01 Encroached

28 S.P.Nanda Dayawathi 01 Farming Mahasorowwa 02 Encroached 01 Encroached

29 M.G.Ajith Jayasingha 06 Farming Mahasorowwa 02 Free hold 02 Encroached

30 S.P.Siriseena 04 Farming Mahasorowwa

Rain Fed

2+6 Encroached 02 LDO Permit

31 S.P.R.Rupasingha 06 Farming Mahasorowwa+

Rain Fed

2+3 Encroached 02 LDO Permit

32 D.Wilson Jayawardana 03 Farming Mahasorowwa 01 LDO Permit 04 LDO Permit

33 Anusha Udayangani 03 Farming Mahasorowwa 01 LDO Permit 04 LDO Permit

List of -Dwellers who will be totally affected due to inundation of dwellings and agricultural lands.District Trincomalai, D.S.Division- Gomarankadawala, G.N.Division 223 A Pamburugaswewa, Village - Pamburugaswewa

Serial

No.


Hold

Family

size

Main

Occupation

Irrigation System Land Within Inundation area



01 K.Y.Sarath Gamini Vithana 04 Farming Pamburugaswewa 02 LOD Permit 02 Encroached

02 B.Kiribanda 02 Farming Mahasorowwa/

Dikwewa

4+4 LOD Permit 02 LOD Permit

03 S.P.Attanayaka 05 Farming Mahasorowwa/

Hapatiyawa

2+2 LOD Permit 02 LOD Permit

04 J.Lional Siritunga 04 Govt. Pamburugaswewa 02 Encroached 0.5 LOD Permit05 Shelton Gunarathna 03 Govt. Mahasorowwa 02 Encroached 0.5 Encroached

06 U.Gunaseekara 02 Farming Pamburugaswewa/Mahasorowwa 01 Encroached 01 Encroached

07 Dikson Gunaseekara 01 Farming Mahasorowwa 02 Encroached 01 Encroached

08 K.Sintha 02 Farming Mahasorowwa/ 04 Free hold 0.5 LOD Permit



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Puliyankulama

09 S.P.N.S.Jayaseekara 02 Farming Mahasorowwa 02 Encroached 0.5 Encroached

10 S.R.Jayaseekara 04 Farming Mahasorowwa 02 Encroached 0.5 Encroached

11 G.Darmaseena 03 Farming Mahasorowwa 0.5+1 LOD Permit 0.5 Encroached

12 D.Karunawathi 02 Farming Pamburugaswwa 2.5 Encroached 01 Encroached

13 M.Rupalatha 04 Farming Mahasorowwa 2.5 Encroached 01 LOD Permit14 S.Premalatha 03 Farming Mahasorowwa 2.5 Encroached 0.5 Encroached

15 R.G.Premasiri 05 Farming Pamburugaswewa/Mahasorowwa 03 Encroached 01 LOD Permit

16 M.Seelawathi 01 Farming Dikwewa/Mahasorwwa+Rain Fed 2+2+4 Encroached 2+1 LOD Permit

17 J.G.Kulatunga 04 Govt. Pamburugaswewa 02 LOD Permit 01 Free hold

18 P.Rani 02 Farming Pamburugaswewa+Rain Fed 3+2 LOD+Encroched 0.5 LOD Permit

19 M.Chandradasa 06 Farming Dikwewa 10 Leased 06 LOD Permit

Serial

No.


Hold

Family

size

Main

Occupation

Irrigation System Lands Within Inundation area



20 U.Beebi 01 Farming Pamburugaswewa 02 Freeholder 0.5 Encroached21 R.M.Saththya Seethan 02 Govt. Pamburugaswewa 2+6 Encroached 01 Encroached

23 R.M.Sriyani Mangalika 02 Farming Pamburugaswewa 02 Encroached 0.5 Encroached

24 K.Jayasundara 04 Farming Pamburugaswewa/

Puliyankulama

06 Encroached 02 Encroached

25 B.Seelawathi 02 Farming Pamburugaswewa 3+2 LOD+

Encroached

01 LOD Permit

26 R.G.Kumarasiri 05 Business Pamburugaswewa 08 Encroached 01 LOD Permit

27 R.G.Saman Sangeewa 03 Govt. Pamburugaswewa 02 Encroached 0.5 LOD Permit

28 M.Jayasooriya 02 Farming Pamburugaswewa 3+2 LOD Permit 01 Leased

29 L.B.Saman Wimalarathna 03 Farming Pamburugaswewa 03 Encroached 0.5 Encroached

30 Sunil Gunawardana 03 Private Pamburugaswewa 04 Encroached 01 Leased

31 R.G.Chandrawathi 05 Farming Pamburugaswewa 02 Encroached 01 Encroached

32 M.Dinapala 02 Govt. Pamburugaswewa 04 Encroached 01 Leased

33 S.Piyatissa 02 Farming Pamburugaswewa 10 Encroached 0.5 Private Own



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34 D.C.Seenadeera 03 Farming Pamburugaswewa 02 Encroached 01 Encroached

35 U.Beebi 01 Farming Pamburugaswewa 02 Private Own 0.5 Encroached

36 S.Saththyawardana 04 Farming Pamburugaswewa/

Puliyankulama+Rain Fed

2+4+4 Encroached 0.5 Encroached

37 R.M.Sriyani Mangalika 02 Farming Pamburugaswewa 02 Encroached 0.5 Encroached

38 B.Seelawathi 02 Farming Pamburugaswewa 3+2 LOD+

Encroached

01 LOD Permit

39 R.G.Kumarasiri 05 Business Pamburugaswewa 08 Encroached 01 LOD Permit

40 M.Jayasooriya 02 Farming Pamburugaswewa 3+2 LOD Permit 01 Leased

Dwellers who will be affected due to inundation of paddy lands only

District Trincomalai, D.S.Division- Gomarankadawala, G.N.Division 223 A Pamburugaswewa, Village - Pamburugaswewa

Serial

No.

Name of Head of House Hold Family

size

Main

Occupation

Irrigation System Lands Within Inundation area



01 B.Mahinda Wijeepala 03 Farming Pamburugaswewa 02 Encroached - -02 M.Sooraseena 06 Farming Mahasorowwa 06 Encroached - -

03 S.Saththyawardana 04 Farming Pamburugaswewa/

Puliyankulama+Rain

Fed

2+4+4 Encroached - -

04 A.Susantha 06 Farming Puliyankulama 04 LOD Permit - -

05 B.Alesingho 06 Farming Pamburugaswewa 04 Encroached - -

06 R.G.Saman Sangeewa 03 Govt. Pamburugaswewa 02 Encroached - -

07 R.M.C.K.Rathnayaka 02 Farming Pamburugaswewa 02 Encroached - -

08 S.P.Lal Gunathilaka 04 Govt. Mahasorowwa 12 Encroached - -

09 B.Sudath Raveendra 05 Farming Mahasorowwa 03 Encroached - -



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List of -Dwellers who will be totally affected due to inundation of dwellings and agricultural landsDistrict Trincomale ,

D.S.Division-Gomarankadawela, G.N.Division Pamburugaswewa, Village - Peththawawewa

Serial

No.

Name of Head of

House Hold

Family

size

Main

Occupation




01 Priyantha Rajakaruna 02 Govt. Peththawawewa O2 Encroached 01 Encroached02 J.Rajakaruna 06 Farming Peththawawewa 1.5+3 Free holder + Encroached 03+02 Encroached

03 R.Sisira Premarathna 05 Govt. Peththawawewa 02 Encroached 02 Encroached

04 S.Puspha Kumara 06 Govt. Peththawawewa 05 Encroached 1.5 Encroached

05 R.Upathissa 03 Govt. Peththawawewa 02 Encroached 01 Encroached

06 S.Wasanthi 02 Farming Peththawawewa 01 Encroached 03 Encroached

07 S.Yasohamy 03 Farming Peththawawewa 02 Encroached 05 Encroached

08 J.Anil Munasingha 03 Farming Peththawawewa 02 Encroached 02 Encroached

09 R.Jayasingha 03 Farming Peththawawewa 11 Encroached 03 Encroached


District Tricomalei , D.S.Division- Gomarankadawela, G.N.Division Gomarankadawela, Village - Dikwewa

Serial

No.

Name of Head of

House Hold

Family

size

Main

Occupation




01 R.Bisomenike 04 Farming Kimbupatiyawawewa 01 Encroached 0.5 Encroached

02 J.Siril Kumarathunga 05 Govt. Dikwewa 04 Encroached 01 Encroached

03 H.Ranaweera 05 Farming Dikwewa 04 Encroached 01 LOD Permit

04 K.Sarath Wimalasiri 05 Govt. Dikwewa 02 Encroached 02 Encroached

05 R.M.A Dammika 03 Farming Dikwwa 03 Encroached 01 Encroached

06 H.P.Nimal Jayaneththi 04 Farming Dikwewa 02 Encroached 01 LOD Permit



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Serial

No.

Name of Head of

House Hold

Family

size

Main

Occupation




01 DM.Sumith Seenadeera 06 Farming Mahasorowwa 03 Encroached 1.5 Encroached

02 J.Mahinda Kumara 03 Govt. Puliyankulama 03 Encroached 0.5 Encroached03 S.P.Swarna Kusumalatha 02 Farming Dikwewa 02 Encroached 01 LOD Permit


Tricomalei , D.S.Division- Gomarankadawela, G.N.Division Gomarankadawela, Village - Kumbukwewa

Serial

No.

Name of Head of

House Hold

Family

size

Main

Occupation




01 K.Rathnawathi 01 Farming Kumbukwewa 02 Encroached 0.5 Encroached

02 S.P.Jayathilaka 05 Govt. Mahasorowwa+Dikwewa 08 Encroached 01 Encroached03 R.P.Ariyawathi 07 Farming Mahasorowwa/Hapatiyawa 10 Encroached 1+3 LOD+

Encroached

04 A.M.Jayasooriya 03 Farming Kumbukwewa+Mahasorowwa 02 Encroached 01 Encroached

05 H.G.Palitha 03 Laborer Kumbukwewa 02 Encroached 0.5 Encroached

06 R.M.Janaka Sanjeewa 07 Laborer Kumbukwewa 02 Encroached 0.5 Encroached

07 A.M.Saman Kumara 03 Govt. Kumbukwewa 02 Encroached 0.5 Encroached

08 R.A.Senavirathna Banda 02 Farming Kumbukwewa 3.5 Encroached 0.5 Encroached

09 A.M.Ruvan Kumara 03 Govt. Kumbukwewa 02 Encroached 01 Encroached

10 S.P.Saman Weerasingha 03 Farming Kumbukwewa 02 Encroached 01 Encroached

11 K.Tikirimanika 04 Farming Kumbukwewa 02 Encroached 01 Encroached

12 K.Jayakody 02 Farming Kumbukwewa 02 Encroached 1.5 Encroached

13 M.Sameel 02 Farming Kumbukwewa 01 LOD Permit i 01 Jayaboomi

14 K.D.Sumith Kumara 03 Farming Kumbukwewa 03 Encroached 01 Encroached

15 03T.G.Nimal Wijetunga 04 Farming Kumbukwewa 04 Freeholder 01 Encroached



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16 S.P.Kamalawathi 04 Farming Mahasorowwa 4+4 LOD Permit +

Encroached

02 Encroached

17 K.D.Sunil Ekanayaka 07 For.Emp. Kumbukwewa 08 Encroached 01 Encroached

18 S.P.A.P.Rathnaaka 02 Govt. Mahasorowwa 02 Encroached 01 Encroached

19 S.P.Rathnayaka 04 Farming Mahasorowwa 02 Encroached 01 Free holder

20 A.G.Niwton Perera 05 For.Emp. Kumbukwewa 06 Encroached 0.5 Encroached


District- Trincomalei , D.S.Division- Gomarankadawewela, G.N.Division Pamburugaswewa, Village - Kumbukwewa

Serial

No.

Name of Head of House Hold Family

size

Main

Occupation

Irrigation

System




01 Kamalawathi Marasingha 01 For.Emp. Kumbukwewa 05 Private Own - -

02 R.G.Anura 05 For.Emp Kumbukwewa 02 Encroached - -

03 R.G.Sakunthala Rajapaksa 05 Govt. Pamburugaswewa 06 Encroached - -

04 A.G.Premananada 01 Farming Kumbukwewa 02 Encroached - -

05 S.Siril Jayarathna 02 Farming Hapatiyawewa 02 Encroached - -

06 A.Ruvina 02 Farming Kumbukwewa 02 Private Own - -

07 S.Saman Thilakarathna 03 Govt. Kumbukwewa 03 Private Own - -

08 G.Mithrapala 05 Farming Pamburugaswew+

Hapetiyawawa

02 Encroached - -


District Anuradhapura, D.S.Division- Horowpathana, G.N.Division Marandamaduwa, Village - Mawathawewa

Serial

No.

Name of Head of

House Hold

Family

size

Main

Occupation




01 H.Weela 05 Farming Mawathawewa 2+5 Freeholder +Encroached 1.5 Encroached

02 U.G.Ariyawathi 04 Farming Mawatahwewa+

Rain Water

4+3 LOD Permit +

Encroached

2.5 LOD Permit



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03 S.W.Sisira Kumara 04 Govt. Mawathawewa 12.5 LOD Permit 04 LOD Permit

04 S.Nimal Premarathna 04 Farming Mawathawewa 2+10+4 Freeholder + LOD Permit

+Encroached

2+2+3 LOD Permit

+Encroached

05 P,N,Karunarathna 05 Govt. Mawatahwewa+

Rain Water

5+3 Freeholder + LOD Permit

i

1+4 Swarnaboomi

+Encroached

06 U.Ukkumanike 04 Farming Mawathawewa 13+12+12 Freeholder + LOD Permit

+Encroached

4+8+6 Freeholder + LOD

Permit +Encroached

07 S.Piyathilaka 04 Farming Mawatahwewa 3.5 LOD Permit 1+3 LOD Permit

+Encroached

08 S.Chandrathilaka 04 Farming Mawathawewa 13.5+06 LOD Permit i

+Encroached

3+4 Swarnaboomi

+Encroached

09 M.Aberathna 04 Farming Mawathawewa 2+2 LOD Permit +

Swarnaboomi

03 Encroached

10 W.R.Munidassa 03 Farming Mawathawewa 02 Encroached 1.5 Encroached

11 B.Bandiya 04 Farming Maradamadu

Vanela+Mawathawewa

04 Swarnaboomi 2+6 Encroached

12 E.M.J.A.Bandara 03 Govt. Mawathawewa 2+2 Jayaboomi+

Encroached

03 Encroached

13 W.S.Vishaka Jayalath 02 Business Mawathawewa 2+2 Jayaboomi+

Encroached

02 Encroached

14 W.D.Rukmani Jayalath 01 Farming Mawathwewa 04 Encroached 01 Encroached

15 M.G.Somasiri 06 Farming Mawathawewa 1+2+6 Freeholder + LOD Permit

Encroached

02 LOD Permit

Continue

District Anuradhapura, D.S.Division- Horowpathana, G.N.Division Marandamaduwa, Village Mawathawewa

Serial

No.

Name of Head of

House Hold

Family

size

Main

Occupation




16 K.Nimal Somarathna 04 Laborer Mawathawewa 02 LOD Permit 1.5 LOD Permit

17 H.C.P.Kaldera 03 Farming Mawathwewa 05 LOD Permit 1.5 LOD Permit



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18 P.N.Ranaweera 03 Govt. Mawathawewa+Rain Fed 8.5+1.5 LOD Permit i+

Encroached

02 Encroached

19 L.Jayaweera 04 Farming Mawathawewa 03 Temporary

Permit

03 Temporary

Permit

20 B.Peiris 05 Farming Mawathawewa+Rain Fed 1+20 Freeholder

+Jayaboomi

05 Encroached


01 L.Wickramasingha 03 Farming Mawathawewa 03 Encroached 02 Encroached

02 G.Suneethra Irangani 02 Farming Mawathawewa 05 Encroached 04 Encroached

03 T.Rangith Senarathna 04 Govt. Mawathawewa 22 Freeholder 4.5 Freeholder

04 K.Milton Karunarathna 04 Govt. Mawathawewa 04 LOD permit 03 LOD Permit

05 B.Samarawickrama 05 Farming Mawathawewa+

Rain Fed

2+9 Private Own+

Encroached

10 Freeholder

06 T.Karunarathna 05 Farming Mawathawewa

+Rain Fed

2+48 Freeholder+

Encroached

15 Freeholder

07 Y.Alwies 02 Farming Mawathawewa O5 LOD Permit 01 LOD Permit

Dwellers who will be affected due to inundation of dwellings and home gardens only .

01 G.Raveendra Mal 03 Govt. Mawatahwewa - - 01 LOD Permit

02 R.D.Siriwardana 05 Govt, Mawathawewa - - 02 LOD Permit

03 Y.Laxman Jayakody 03 Govt. Mawathawewa - - 02 Freeholder

04 Y.Sunil Shantha 04 Govt. Mawatahwewa - - 02 LOD Permit

05 T.Wansawathi 02 Farming Mawatahwewa - - 01 Freeholder



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District Anuradhapura, D.S.Division- Horowpathana, G.N.Division Pahala Diwelwewa, Village - Phwudulwewa

Serial

No.

Name of Head of

House Hold

Family

size

Main

Occupation

Irrigation

System




01 P.Jayatissa Peiris 05 Farming Puhudulwewa+Rain fed

3+20 LOD Permit +Encroachment

2+9 LOD Permit +Encroachment

02 P.Thusara 04 Farming Puhudulwewa 04 Encroachment 02 Encroachment

03 W.S.S.Jayawimala 03 Govt. Puhudulwewa 02 Encroachment 0.5 Encroachment

04 S.Lalsiri 03 Govt. Puhudulwewa 02 Encroachment 01 Encroachment

05 U.B.Samaranayaka 03 Farming Puhudulwewa 3+2.5 LOD+ Encroachment 3 Encroachment

06 U.B.Siriseena 02 Farming Puhudulwewa 05 Encroachment 02 Encroachment

07 K.Premachandra 02 Farming Puhudulwewa 07 Encroachment 07 Encroachment

08 S.Rohitha

Samaranayaka

03 Farming Puhudulwewa 02 Encroachment 0.5 Encroachment

09 U.Podiappuhamy 02 Farming Puhudulwewa 10 LOD Permit + Encroached 03 LOD Permit

10 A.M.Sunil 08 Farming Puhudulwewa 12 Encroachment 02 Encroachment

11 M.Wipula Keerthi 07 Farming Puhudulwewa 02 Encroachment 01 Encroachment

12 U.B.Rathnayaka 05 Farming Puhudulwewa 02 Encroachment 01 Encroachment

13 U.B.Sumanawathi 02 Farming Puhudulwewa 04 Encroachment 02 Encroachment

14 P.Senawirathna 02 Farming Puhudulwewa 10 Encroachment 02 Encroachment

15 K.D.R.K.Rodrigo 04 Farming Puhudulwewa 09 LOD Permit 02 LOD Permit

16 D.Piyasiri Dasanayaka 05 Farming Alapathwewa+

Puhudulwewa

2+4+4 Free holder+ Leased

Encroachment

01 Encroachment

17 K.D.J.Wickramasingha 04 Farming Puhudulwewa+

Rain fed

2+10 LOD Permit

+Encroachment

02 Encroachment

18 A.M.J. Amarako0nn 03 Govt. Puhudulwewa 02 Encroachment 1.5 Encroachment19 A.M.Selton05 05 Farming Phudiwlwewa+

Rain fed

06 Encroachment 2+1 LOD Permit +

Encroachment

20 S.Somasiri 03 Farming Alapathwewa+

Puhudulwewa

04 LOD Permit 02 LOD Permit



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Continue

District Anuradhapura, D.S.Division- Horowpathana, G.N.Division Marandamaduwa, Village - Mawathawewa

Serial

No.


Hold

Family

size

Main

Occupation

Irrigation

System



Extend Ownership Extend Ownership21 P.Sunil Patmasiri 04 Farming Phudiwlwewa+

Rain fed

04+15 LOD Permit +

Encroachment

2+2 LOD Permit +

Encroachment

22 S.S.A.Pathmasiri 02 Farming Phudwlwewa 02 Encroachment 02 Encroachment

23 P.Jayathissa 03 Farming Phudiwlwewa+

Rain fed

5+3 LOD Permit +

Encroachment

1+2 LOD Permit +

Encroachment

24 R.G.K.Rajapaksha 03 Farming Phudwlwewa 1.5 Encroachment 0.5 Encroachment

25 P.Ruban Peiris 04 Farming Phudiwlwewa+

Rain fed

4+16 LOD Permit +

Encroachment

2+2 LOD Permit

26 P.Nimal Jayasiri 04 Farming Phudiwlwewa+

Rain fed

5+15 Temporary permit +

Encroachment

0.5+4.5 LOD Permit

+Encroched

27 H.K.Ajith Kumara 03 Farming Phudwlwewa 05 Encroached 02 LOD Permit28 P.Anulawathi 02 Farming Phudiwlwewa+

Rain fed

30 Encroachment 07 LOD Permit

29 U.B.Dasanayaka 02 Farming Phudwulwewa+

Rain fed

2+20 LOD+ Encroached 2+2 LOD Permit

30 A.M.Aberathna 02 Farming Phudiwlwewa+

Rain fed

6+39 LOD+ Encroached 1+2 LOD Permit

31 J.B.Chaminda Rohan 03 Private Dwulwewa 07 Encroached 2+3 LOD+ Encroached


32 M.Ariyarathna 02 Farming Phudiwlwewa+

Rain fed

2+8 LOD+ Encroached - -

33 A.Pawan Kumara 02 Farming Phudiwlwewa+ 06 LOD Permit - -

34 A.M.Nimal Aberathna 03 Farming Phudiwlwewa+ 02 Encroached - -



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District Anuradapurai , D.S.Division- Horowpathana, G.N.Division Pahala Duwlwewa, Village - Alapathwewa

Serial

No.

Name of Head of

House Hold

Family

size

Main

Occupation

Irrigation

System




01 G.Anurudda Jayalath 05 Farming Alapathwewa 2.5 Encroached 0.5 LOD permit02 R.M.Wijerathna 05 Farming Alapathwewa 1.5 Encroached 02 Encroached

03 R.M.Mudiyanse 08 Farming Alapathwewa+

Rain Fed

1.5+1.5 Freeholder+ Encroached 1+2 Free hold+ Encroached

04 M.Pathmawathi 07 Farming Alapathwewa+Rain

Fed

1+3 Freeholder + Encroached 1+1 Freeholder+ Encroached

05 H.Mahindapala 07 Farming Alapathwewa 05 Encroached 03 Encroached

06 M.Premachandra 02 Farming Alapathwewa 02 Freeholder 0.5 Freeholder

07 P.B.Mudalihamy 07 Farming Alapathwewa+Rain

Fed

1+4 Leased+ Encroached 2+2 Leased+ Encroached

08 A.Gamini Sarath 04 Farming Alapathwewa 0.5 Encroached 04 Encroached

Dwellers who will be affected due to inundation of paddy lands only 09 A.Jayathilaka 02 Farming Alapathwewa 02 Encroached - -

10 D.J.Darmapala 04 Farming Alapathwewa 3.5 Encroached - -


EIA St d Fi l R t

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Annex IV: Air Quality, Noise & Vibration


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Annex - IV

Dust Measurement Report

01. Sample and Analytical Method

02. Sample Collected Locations

Location

NoDescription of Location

GPS

Location

Date & Time of

sampling

Weather

condition

D1

Mahasorow Wewa Village in

proposed reservoir

construction area

213557 E

395202 N

From 8.00am,

10thNov to 6.00

am, 11thNov

Dry weather and

calm wind

D2

About 50m outside from the

canal path and closed to CRCP

stors, Wahalkada D1

210369 E

393939 N

From 9.30am,

12thNov to

6.30am, 13th

Nov

Dry weather and

calm w

yan oya annexes_20!2!13

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