u668 environmental impact assessment upper kon tum

7/29/2019 U668 Environmental Impact Assessment Upper Kon Tum

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Additional environmental impacts assessment Report of Upper Kon Tum Hydropower Project - Vinh Son - Song Hinh Hydropower Joint Stock Company.

Consulting unit: Center for Environmental Monitoring and Analysis of Kon Tum province.

Address: 266 Phan Dinh Phung,Kon Tum city, Kon Tum province – Tel: (060) 3.913.967 – Fax:(060) 3.913.966

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CONTENTS

CONTENTS .............................................................................Error! Bookmark not defined.

TABLE LIST ...........................................................................Error! Bookmark not defined.

ABBREVIATION LIST..........................................................Error! Bookmark not defined.

FOREWORD ...........................................................................Error! Bookmark not defined.1. PROJECT NAME................................................................................................................. 82. PROJECT MANAGER ........................................................................................................ 83. GEOGRAPHICAL POSITION OF THE PROJECT ....................................................... 94. CHANGES IN CONTENT OF THE PROJECT .............................................................10

4.1. Change in implementation location................................................................................ 104.2. Change in scale of project .............................................................................................. 114.3. Change in basic design of work categories .................................................................... 12

4.3.1. Pressure route: ........................................................................................................124.3.2. Energy route: ........................................................................................................... 13

4.4. Change in land using demand of the project .................................................................. 17

4.5. Change in construction volume ...................................................................................... 174.6. Change in demand for machines and equipment............................................................ 194.7. Change in demand for materials and fuels ..................................................................... 204.8. Change in project implementation progress................................................................... 204.9. Change in total investment ............................................................................................. 214.10. Change in compensation and resettlement................................................................... 22

5. CHANGE IN REALITIES OF NATURAL ENVIRONMENT AND ECONOMIC,

SOCIAL FACTORS OF THE PROJECT AREA................................................................ 225.1. Change in geomorphology and geologic........................................................................23

5.1.1. Change in topography adn geomorphology: ........................................................... 235.1.2. Change in features of engineering geology: ........................................................... 235.1.3. Change in hydrological geology:. ........................................................................... 255.1.4. Change in dynamic geology:. ..................................................................................255.1.5. Change in probability of earthquake: ..................................................................... 265.1.6. Change in minerals: ................................................................................................ 26

5.2. Change in meteorological conditions............................................................................. 265.2.1. Changing climate, meteorology: ............................................................................. 265.2.2. Changing hydrographic characteristics: ................................................................ 27

5.3. Change in elements of natural environmental realities .................................................. 315.3.1. Air and microclimate environment: ........................................................................ 315.3.2. Water environment: ................................................................................................. 32

5.4. Change in economic - social conditions......................................................................... 345.4.1. Economic - social conditions in Kon Ray district: .................................................. 345.4.1.1 Economy: ........................................................................................................... 345.4.1.2 Culture and society: .......................................................................................... 35

5.4.2 Economic - social conditions in Kon Plong district: .............................................. 355.4.2.1 Economy: ........................................................................................................... 355.4.2.2 Culture and society: .......................................................................................... 36

5.4.3. Economic - social conditions in Dak Tang commune:............................................ 365.4.3.1. Economy: .......................................................................................................... 365.4.3.2. Culture and society: ......................................................................................... 37

6. CHANGE IN ENVIRONMENTAL IMPACTS AND MEASURES TO MINIMIZE

NEGATIVE IMPACTS OF THE PROJECT....................................................................... 396.1. Change in environmental impacts of the project............................................................ 396.1.1. Preparation and construction period: ..................................................................... 39






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6.1.1.1. Change in impacts because of waste:...............................................................396.1.1.2. Change in impacts not because of waste: ........................................................ 406.1.1.3. Change in risk of environmental problems: ..................................................... 41

6.1.2.Water accumulation and plant operation period: .................................................... 416.1.2.1. Change in impacts relating to waste:...............................................................41

6.1.2.2 Change in impacts not because of waste: ......................................................... 456.1.2.3. Change in risks, environmental problems:....................................................... 586.2. Measures to minimize negative impacts of the project .................................................. 59

6.2.1. Preparation and construction period: ..................................................................... 596.2.2. Period of storing water in reservoir and operating hydropower plant: ................. 65

6.2.2.1. Minimize impacts on quality of surrounding environment: ............................. 656.2.2.2. Minimize impacts on lake water quality and lowlands: ................................... 676.2.2.3. Minimize impacts due to current change: ........................................................ 686.2.2.4. Surface erosion resistance on catchment area of reservoir, reservoir

foundation sedimentation: ............................................................................................. 696.2.2.5. Minimizing erosion and collapse of downstream: ........................................... 70

6.2.2.6. Minimizing probability of losing water of reservoir: .......................................706.2.2.7. Minimizing impacts on ecological system: ....................................................... 716.2.2.8. Minimizing impacts on economy - society: ...................................................... 71

6.3. Minimizing environmental problems ............................................................................. 726.3.1. Minimizing risk due to dam breaking: .................................................................... 726.3.2. Prevention of fire, explosion and industrial safety: ................................................ 74

7. CHANGE IN ENVIRONMENTAL MANAGING AND MONITORING PROGRAM

OF THE PROJECT ................................................................................................................ 757.1. Change in environmental managing program ................................................................ 75

7.1.1. Preparation and construction period: ..................................................................... 767.1.2. Period of storing water in reservoir and operating hydropower plant: ................. 76

7.2. Change in environmental monitoring program ..............................................................777.2.1. Preparation and construction period: ..................................................................... 77

7.2.1.1. Monitoring air environment: ............................................................................ 777.2.1.2. Monitoring water environment: ....................................................................... 777.2.1.3. Monitoring ecological environment:................................................................ 797.2.1.4. Monitoring hydrometeorological environment: ............................................... 797.2.1.5. Monotoring soil erosion: ..................................................................................797.2.1.6. Monitoring compensation, resettlement work:................................................. 80

7.2.2. Period of accumulating water into lake and operating hydropower plant:............ 807.2.2.1. Monitoring air environment:............................................................................ 807.2.2.2. Monitoring water environment: ....................................................................... 807.2.2.3. Monitoring quality of ecological environment:................................................ 827.2.2.4. Monitoring economic and social environment:................................................ 827.2.2.5. Monitoring hydrometeorological environment: ............................................... 82

8. OTHER CHARNGES ......................................................................................................... 828.1. Suggestions of the communal People's Committee........................................................ 83

8.1.1. People's Committee of Đăk Tang commune: .......................................................... 838.1.2. People's Committee of Mang Canh commune: ....................................................... 838.1.3. People's Committee of Ngoc Tem commune: .......................................................... 848.1.4. People's Committee of of Đăk Koi commune:......................................................... 84

8.2. Suggestions of the Fatherland Front Committee............................................................ 84

8.2.1. Fatherland Front Committee of Đăk Tang commune:............................................ 848.2.2. Fatherland Front Committee of Mang Canh commune: .........................................848.2.3. Fatherland Front Committee of Ngoc Tem commune: ........................................... 85






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8.2.4. Fatherland Front Committee of Đăk Koi commune: .............................................. 859. CONCLUSION.................................................................................................................... 85

TABLE LIST

Table 1: List of direct participants into process of implementation and setting up

environmental impacts assessment report ................................................................................... 8Table 2: Limiting coordinates of location of Upper Kon Tum hydropower plant categories . ...9

Table 3: Changes in major specifications of the work.............................................................. 11

Table 4: Change in construction parameters (basic design) of pressure route..........................12

Table 5: Change in construction parameters (basic design) of pressure route.......................... 13Table 6: Land acquisition area of the work............................................................................... 17

Table 7: Major volume of work of Upper Kon Tum hydropower plant ................................... 17

Table 8: Major hydraulic machines, equipments of the Plant................................................... 19

Table 9: Water supply demand for production and living......................................................... 20

Table 10: Summarize investment of the project........................................................................ 21Table 11: Evaporation on reservoir surface of Upper Kon Tum Hydropower Plant (mm). .....27

Table 12: Characteristics of river basin morphology to dam site 1A........................................27

Table 13: Characteristics of yearly current of work route hydrography................................... 28

Table 14: Design flood peak on Upper Kon Tum dam site 1A ................................................ 29

Table 15: Flood peak on plant route 4 of Upper Kon Tum Hydropower.................................. 29Table 16: Floor peak at opening S1and S2................................................................................ 29

Table 17: Total design flood volume at the dam site 1A...........................................................30

Table 18: Flood peak volume during months of dry season at dam site 1A............................. 30

Table 19: Measurement and analysis results of air, microclimate environment. ...................... 31Table 20: Measurement and analysis results of surface water environment. ............................ 32Table 21: Measurement and analysis of underground water environment. .............................. 33

Table 22: Statistics of household whose flooded land. .............................................................40

Table 23: Flood peak height in September 2009 at the hydrographic station in Kon Tum province..................................................................................................................................... 41

Table 24: Pollution load of the transport means........................................................................ 42Table 25: Noisy level at some distances (taking into account of spread of noise).................... 43

Table 26: Dirt load/person/day/night ........................................................................................ 43

Table 27: Concentration of pollutants in household waste if not treated.................................. 43Table 28: Value P in reservoir upon reservoir foundation clearance plans............................... 48

Table 29: Necessary current for maintaining river condition upon Tennant method............... 50Table 30: Lowstream water supply demand of Upper Kon Tum dam until 2020..................... 51

Table 31: Annual total sludge coming to dam site 1A. .............................................................53

Table 32: Reservoir accumulation capacity after years of operation........................................ 53

Table 33: Estimated costs of compensation, land clearance, resettlement and infrastructuresupport of Upper Kon Tum Hydropower plant......................................................................... 63Table 34: Design flood pek of Upper Kon Tum dam site 1A route.......................................... 69

Table 35: Flood peak discharge during months of dry season at dam site 1A.......................... 69Table 36: Air environmental monitoring program during preparation and construction.......... 77






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Table 37: Water environmental monitoring program during preparation and construction..... 78

Table 38: Air environmental monitoring program during period of storing water in reservoir and operating hydropower plant ................................................................................................ 80

Table 39: Water environmental monitoring program during perido of storing water in reservoir and operating hydropower plant ................................................................................................ 80

ABBREVIATION PLANT

BQL : Management unit

BTCT : Reinforced concrete

CHXHCN : Socialist republic

CP : Share

DA : Project

ĐBDTTS : Ethnic minority groups

ĐTM : Environmental impacts assessment

GPMB : Land clearance

KTXH : Social economy

MNC : Dead water level

MNDBT : Retention level

NĐ : Decree

NMTĐ : Hydropower plant

QCVN : Vietnamese Code

QĐ : Decision

SXLD : Erection manufacturing

THCS : Junior high school

TT : Circular

TTg : Prime Minister

UBMTTQ : Fatherland Front Committee

UBND : People's Committee






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FOREWORD

In association with the social-economic development, promotion of industrialization - modernization of the country, demand for electricity is increasing.

The Dak SNghe River, a major branch of a river creating Dak Bla River - one of the

two large branches of a river forming Se San River with the third large storedhydropower energy in Vietnam. Vinh Son - Song Hinh Hydropower Joint Stock Company undertakes setting up Upper Kon Tum Hydropower Project to provide the

National Grid with electricity, enhance welfare of the people and local economy in particular and Tay Nguyen provinces in general. Besides, the Project also addsirrigation water resources for Tra Khuc River basin, Quang Ngai province.

Apart from above positive impacts, undertaking construction and putting project

into operation shall cause unexpected impacts on the environment (air, water, land,flora and fauna etc) and economy - society in region (transformation of professions,resettlement and agricultural resettlement etc). Therefore, the Company set up theEnvironmental Impacts Assessment Report for the Project has been adopted upon the

Decision No. 1718/QĐ-BTNMT dated 29th August 2008 of the Ministry of NaturalResources and Environment.

However, at present, some essential contents of the Project were changed (UponDecision No. 587/2009/QĐ-VSH-HĐQT dated 13th July 2009 of the Board of Management of Vinh Son - Song Hinh Hydropower Joint Stock Company on adoption

of the investment Project for construction of Upper Kon Tum Hydropower Project),following is changed contents:

1. Assembly capacity of the Plant reduced from 250 MW to 220MW;

2. Flooded forest area reduced from 384,8 ha to 284,41 ha;

3. Agricultural land area reduced from 89,73 ha to 30,65 ha;

4. Quantity of resettlement household reduced from 310 to 82 households;

5. Reservoir area corresponding with retention level reduced from 8.6 km2 to 7.081 km2.

6. Dam crest level reduced from 1.177 m to 1.163 m;

7. Largest height of water column reduced from954,5 m to 944,1 m;

8. Total area of water supply basin for Upper Kon Tum Hydropower Project increased

from 350 km2 to 374 km2. However, capacity of entire reservoir reduced from 173.7

millions m3 to 145.52 millions m3 and design rate of flow through the plant reduced from

30.5 m3/s to 29.96 m3/s .






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9. Dam site position is adjusted (dam site 1A) about 3.3 km from the dam site 1

(previous plan) towards lowstream of Dak SNghe River;

10. The resettlement area of the project is within Dak Tang commune, upon adjusted

plan (within Mang Canh commune upon previous plan);

Other specifications of the project are unchanged in quantity, scale, location etc

Therefore, the Company cooperates with the Center for Monitoring and Analysis of Kon

Tum province sets up the additional environmental impacts assessement Report for the Upper Kon TumHydropower Project.

v Applicable standards, codes:

- TCVN 3985 – 1999: Noise standard for the manufacturing and construction area.

- QCVN 08 : 2008/BTNMT: National technical regulation on surface water quality.

- QCVN 09 : 2008/BTNMT: National technical regulation on underground water

quality.

- QCVN 14 : 2008/BTNMT: National technical regulation on householdwastewater.

- QCVN 05 : 2009/BTNMT: National technical regulation on surrounding air quality.

- QCVN 06 : 2009/BTNMT: National technical regulation on some toxic

substances in surrounding air.

- QCVN 26 : 2010/BTNMT: National technical regulation on noise.

v Administrative, technical documents and others about the Project:

- Official dispatch No.1744/TTg-CN dated 01st November 2006 of the Prime Minister

on permitting investment in Upper Kon Tum Hydropower Project, Kon Tum province

- Decision No. 1718/QĐ-BTNMT dated 29th August 2008 of the Ministry of Natural

Resources and Environment on adoption of the environmental impacts assessment report of the Upper Kon Tum Hydropower Project.

- Decision No. 341/QĐ-UBND dated 13th April 2009 of the People's Committee of Kon

Tum province on adoption of a Master plan for compensation and support for construction of

Upper Kon Tum Hydropower Project -at Kon Plong district, Kon Tum province.

- Official dispatch No. 5477/BCT-NL dated 12th June 2009 of the Ministry of

Industry and Trade to offer suggestions on the investment project for Upper Kon Tum

Hydropower plant.






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- Official dispatch No. 1051/TTg-KTN dated 25th June 2009 of the Prime Minister

on permitting decision on investment in Upper Kontum Hydropower project.

- Decision No. 587/2009/QĐ-VSH-HĐQT dated 13th July 2009 of the Board of

Management of Vinh Son - Song Hinh Hydropower Joint Stock Company on adoptionof the investment project for construction of Upper Kon Tum Hydropower Project work.

v Application method during assessement of additional environmental impacts:

- Descriptive statistical method: This is assessment method based upon syntheticand analysis results of natural figures (meteorology, hydrolgoy, ecology features etc)and economy - society within region before imp lementation of project, in associationwith the objective actual survey. And then forecast impacts of the project on natural,

economic - social conditions as the projects is commissioned.

- Field survey method: This method surveys characteristics of the geology, topography, ecosystem and economic - social subjects etc at the project areas, with a view to assess object and

level ofunder influence as undertaking construction of the project and as it's commissioned .

- In situ sampling and labo analysis method: This method surveys, samples on thesite and analyzes specific environmental parameters in the lab, with a view to specify

parameters of environmental quality realities at the project area (air environment, water

environment) as basis to assess level of impact of the project as it's commissioned.

- Comparative method: This is used to assess impacts on the basis of comparison

with the present valid Vietnamese environmental standards and codes.

- Interpolative method: Base upon figures from the hydropower and hydraulic projects with a view to forecast level of influence of the sources of pollution as the

project is commissioned.

- Community consulting method: Consult the People's Committees and FatherlandFront Committees of the commune to undestand proposals of the local people during

construction and commission of the project.

v Organize assessment of the additional environmental impacts:

The additional environmental impacts assessment Report of the Upper Kon TumHydropower project chaired by the Vinh Son - Hong Sinh Hydropower Joint Stock Company upon advisory of the Center for Environmental Monitoring and Aanalysis of Kon Tum province.

Information of the Center for Environmental Monitoring and Analysis of KonTum province:

-

Represented by: Mr. Nguyen Tu Chuong Position: Deputy Director - Address: 266 Phan Dinh Phung – Kon TumCity – Kon Tum province






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- Tel: (060) 3.913.967 Fax: (060) 3.913.966.

- Email: [email protected]

The direct participants into implementation and setting up the additional

environmental impacts assessment Report:Table 1: Direct participants in implementation and setting up the additional environmental

impacts assessment Report

No Full name Degree Specialty

1 Nguyen Tu Chuong Bachelor Biology + Law

2 Nguyen Thanh Tuan Bachelor Biology

3 Duong Thi Hong Luan Engineer Environment

4 Nguyen Thi Hong Loan Engineer Environment5 Ho Thi Anh Tuyet Engineer Environment

6 Le Van Tuan Bachelor Environment

7 Le Van Tuan Bachelor Biology

In addition to, there are also below participation of experts :

1. Nguyen Minh Thien - Hydrometeorological Expert - working at the

Hydrometeorological station in mid central region II.

2. Nguyen Van Huy - Hydrometeorological Expert - working at theHydrometeorological station in Kon Tum province

3. Tran Dong Phong - Environmental Expert - working at the University of CivilEngineering of Hanoi

4. Nguyen Thi Quynh Huong - Environmental Export - working at the Unviersityof Civil Engineering of Hanoi.

And some others in ecology, environment, electricity and hydropower.

v Scope of report: The additional environmental impacts assessment report of Upper Kon Tum Hydropower project is not including environmental impacts assessment for thetransmssion line system, road system outside of the site, flood prevention roads,resettlement area and building materials mine. The project manager shall make separate

reports for the aforesaid works.

1. PROJECT NAME

Upper Kon Tum Hydropower.

2. PROJECT MANAGER

- Project manager Office: Vinh Son - Song Hinh Hydropower Joint Stock Company.






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- Representative : Mr. Vo Thanh Trung. Position: General Director

- Contact address : 21 Nguyen Hue, Quy Nhon City, Binh Dinh province

- Tels : 056.3892792 Fax: 056.3891975.

3. GEOGRAPHICAL POSITION OF THE PROJECT

The Upper Kon Tum Hydropower Plant locates on Dak SNghe River, a branch of

Dak Bla River (1st grade branch of Se San River). It's a cluster of head works, energyroutes and reservoir within Dak Koi commune, Kon Ray district and Dak Tang, MangCanh, Mang But communes and Kon Plong district. The hydropower plan locates in

Ngoc Tem commune, Kon Plong district, Kon Tum province (See attached map of

Upper Kon Tum Hydropower plant location in appendix 4).

Upon the Decision No. 587/2009/QĐ-VSH-HĐQT dated 13th July 2009 of the

Board of Management of Vinh Son - Song Hinh Hydropower Joint Stock Company onadoption of the investment project for construction of Upper Kon Tum Hydropower

plant, the dam site location (dam site 1A) is adjusted to locate about 3.3 km (previous plan) from the dam site 1 towards downstream of Dak SNghe River.

The reservoir is 7.081 km2 width (previous plan is 8.6 km2) within Dak Koicommune, Kon Ray district and Dak Tang, Mang Canh, Mang But communes, KionPlong district.

The hydropower plant shall exhaust water to Dak Lo stream in Ngoc Temcommune, Kon Plong district, Kon Tum province.

- The location limiting coordinates of the work categories as below:

Table 2: Location limiting coordinates of the Upper Kon Tum Hydropower work

categories

Previous plan Adjusted planNo Work category

X Y X Y

1 Pressure route 1627957 0578776 1625250 0578734

2 Water intake 1630071 0579443 1630071 0579443

3 Plant 1629213 0594512 1629213 0594512

Hence, out of adjusted dam site location, construction location of Upper Kon TumHydropower plant is unchanged as mentioned in environmental impacts assessmentreport has been adopted upon the Decision No. 1718/QĐ-BTNMT dated 29th August

2008 of the Ministry of Natural Resources and Environment on adoption of theenvironmental impacts assessment report of Upper Kon Tum Hydropower Project.






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- Correlationof the project area with the natural, economic and socialobjects:

+ Road system:

From the center of Kon Plong district to the head works along with Provincial

road 676 is the grade IV mountainous road 26 km length. After restoration, it'sapproximately 16 km length.

The road from Hieu commune to the plant is about 24 km length, grade VImountainous earth road including many slope, serpentine sections are special difficultyfor the heavy transport means to travel. At present, this route is under construction in

Dong Truong Son road Project

In addition to, it also may come to the plant on the road from Quang Ngai through

Son Ha town about 30 km. This is an earth road section, not as slope as the road from

Hien commune, but it hardly restored, always collapsed during rainy season. At present,this route is under construction in Quang Ngai - Ngoc Tem highway project, for transporting equipment to the Plant.

+ River, stream, mountain and hill system:

The Upper Kon Tum Hydropower plant locates on Dak SNghe River is the

headwater of Dak Bla River. It is originated from Ngoc Rin mountain is 1.848m in heightwithin Mang Canh commune, Kon Plong district, main thread of current is North - Souththrough Dak Khich, Dak Chun range of mountains with mountain peak is 1.560m in

height. Total area of Dak SNghe River basin combining with Dak Bla River basinapproximately 960 km2. In which, basin area until dam site 1A of Upper Kon Tum is 374km2, accounting for 38.95% total basin area.

Basin terrain is fair complicated, inserting with high mountain masses and hills.This area is characterized with deep separation of the terrain with large gradient andmountain sides. The basin is 1.384m in average height. The high hilly terrain is strong

separated, river and stream network is rather dense with river network density on basinis 0.415 km/ km2.

+ Population within Project area is almost Xo Dang people, only a few of KinhPeople. Income level of the local people is mostly from agriculture, forestry and a veryfew from small businesses (Figures of population, ethnic elements of project area

would be detailed presented in part 5 of this Report).

+ The cultural works, historical vestiges: The project area there is Mang But victory

historical vestige about 20 km from dam site 1A. Until now, there is no any valuablearchaeological relic is discovered in project area.

4. CHANGES IN CONTENT OF THE PROJECT

4.1. Change in implementation location






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Upon the Decision No.587/2009/QĐ-VSH-HĐQT dated 13th July 2009 of theBoard of Management of Vinh Son - Song Hinh Hydropower Joint Stock Company onadoption of the investment project for construction of the Upper Kon Tum Hydropower Project, its pressure route construction location has following specific change as:

Pressure route is about 3.3 km (previous plan) from the dam site 1 towards Dak SNgheRiver basin upon adjusted plan (dam site 1A).

4.2. Change in scale of project

At present, scale of the Upper Kon Tum Hydropower Project there is changes

against mentioned scale in the environmental impacts assessment Report has beenadopted upon the Decision No.1718/QĐ-BTNMT dated 29th August 2008 of theMinistry of Natural Resources and Environment. Including below major changes:

Table 3: Changes in major s pecifications of the work.

Specifications

No Features of work Unit Previous

plan

Adjusted

plan

I Basins

1 Basin area km2 350 374

2 Average annual rainfall mm 2.800 2.800

3 Average annual capacity Q0 m3/s 15.2 16.2

4 Total annual flow volume W0 10

6

m

3

483 510.88II Dam site reservoir Dam site 1 Dam site 1A

5 Retention level m 1.170 1.160,00

6 Dead water level m 1.146 1.138,0

7 Design flood level 0,5% m 1.175,7 1.160,1

8 Check flood water level 0,1% m 1.176,21 1.161,7

9 Useful capacity Whi 106m3 122.7 103.06

10 Gross capacity Wtb 106m3 173.7 145.52

11 Reservoir surface corresponding with retention level km2 8.6 7.081

III Discharge

12 Flow of flood corresponding with frequency P =0.02%

m3/s 3.521

13 Flow of flood corresponding with frequency P = 0.1% m3/s 2.531 2.650

14 Flow of flood corresponding with frequency P = 1% m3/s 1.598 1.672

15 Flow of flood corresponding with frequency P = 5% m3/s 1.132

16 Flow of flood corresponding with frequency P = 10% m3/s 893 935

IV Plant

17 Rate of flow through the plant m3/s 30.5 29.9618 Largest column of water Hma x m 954.5 944.1






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19 Smallest column of water Hmin m 882.2 838.8

20 Design head Htt m 904.1 844

21 Assured capacity MW 91.5 90.76

22 Assembly capacity MW 250 220

23 Assembly quantity Team 2 2

24 Annual average output E0106kW

h1.056,4 1.094,2

25 Assembly capacity using hour hour 4.224 4.974

V Total investment 109đ 5.245 5.744,425

VI Economic criteria

B/C 1.38 1.4

NPV 109đ 1.244,5 1.429,89

IRR % 13.7 13.64.3. Change in basic design of work categories

The construction method (basic design) of work categories of the Project are

unchanged against contents in the environment impacts assessment Report has beenadopted. However, because of change in major specifications of the Project,construction parameters of which also changed as followings:

4.3.1. Pressure route:

Table 4: Change in construction parameters (basic design) of pressure route.

Number

No Name of category Unit Previous

plan

Adjusted

plan

1 Weir: Waterproofing falling stonewith concrete face

- Crest level m 1.177 1.163,0

- Crest height m 392,93 279,38

- Crest width m 10.0 10.0- Upstream slope 1:4.05 1:4.05

- Downstream slope 1:1,5 1:1,5

- Largest height m 73.0 78.0

2 Spillway: Reinforced concretestructure with valve gate

- Overflow weir level m 1.161 1.151,0

- Over-fall gap quantity Gap 3 3

- Width of a gap Bk m 8 8- Water slope dimension b×l m 30×84 29×84.71






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- Injecting nozzle top level m 1.133,0 1.122,3

- Scour hole bottom width m 11.5 11.5

- Scour hole bottom level m 1.093,66 1.083,0

v Weir:

Major weir has falling stone structure, waterproofing with concrete face. Dam

body is filled with rock exploited from stone quarry and stone waste from foundation pit of the work categories.

- Crest level is 1.163m, 279.38 m length along the crest. Crest level width Bđ = 10

m. Upstream slope 1:4,05; downstream slope 1:1,5; arranging banquette is 5 m in depthat the attitude of 1.110.6 m.

- Waterproofing concrete face width t = 0.3+0.003H, separated into sections are

25m in length of each, transit materials along with body of upstream dam withtransition beds 2A and 2B. Waterproof with foundation, cement skin drilling towaterproof at the foundation.

- Body of upstream dam is filled with hard stone materials 3B and weathered stoneexploited from the stone quarries, body of downstream is filled with rock layer 3C, acombination of medium and strong weathered rock.

v Spillway:

Spillway is arranged on the right abutment of weir is spillway with valve gate,reinforced concrete structured and located on solid IIA base. Dam has vacuum practical

profile, in Ofixerop style. Overflow weight level is 1.151 m. There are 3 overflow gapson a dam, 8.0m width of each gap, valve gate dimension is b×h=8×13 m, lifting and

lowering with hydraulic cylinder on the crest of weir for assembly and repair. Multi-function crane is arranged in upstream and traffic bridge is located in downstream for travel between two banks.

4.3.2. Energy route:

Table 5: Change in construction parameters (basic design) of energy route

NumberNo Category name Unit

Previous plan Adjusted plan

1 Water intake: Reinforced concrete

- Water intake height m 43

- Water intake threshold level m 1.138,0 1.123,0- Water intake crest level m 1.177,0 1.163,0- Intake quantity intake 1 1

- Largest rate of flow through intake m3

/s 29.862 Water tunnel






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- Section 1, reinforced concretestructure, t = 0,3m+ Length m 817.6 857.28

+ Bottom slope i % 2 2+ Cross section Semi circle Semi circle+ Inside diameter Do m 3.4 3.4

+ Dimension h×bđ m 4×4 4×4- Section 2, without armor + Length m 13.017,4 13.071,4+ Bottom slope i % 2 2

+ Cross section Semi circle Semi circle+ Dimension h×bđ m 5.3×5.6 5.3×4.0- Section 3, reinforced concretestructure, t = 0,4m, armored

+ Length m 822 822+ Bottom slope i % 2 2+ Cross section Semi circle Semi circle+ Inside diameter Do m 4.5 4.5

+ Dimension h×bđ m 5,3×5,3 5,3×5,3- Section 4, without armor + Length m 2.197,89 2.197,89

+ Bottom slope i % 2 2+ Cross section Semi circle Semi circle

+ Dimension h×bđ m 5,3×5,6 5,3×4,03

Surge tank, reinforced concrete

structure

- Crest level m 1.200 1.200- Center of pipe elevation m 802.74 802.74- Opening section inside diameter m 14 12- Underground section inside diameter m 3.4 3.4

4 Pressure tunnel

- Section 1, reinforced concrete, t =0,4m, armored+ Length m 1.332,42 1.332,42+ Bottom slope i % 2.16 2.16

+ Cross section Semi circle Semi circle+ Inside diameter Do m 2.6 2.6+ Dimension h×bđ m 3.4×3.4 3.4×3.4

- Vertical section 2, reinforcedconcrete structure, t=0,4m, armored

+ Length m 560.09 560.09+ Bottom slope i

+ Cross section Circle Circle+ Inside diameter Do m 2.6 2.6






- 1 5 -

- Section 3, reinforced concretestructure, t = 0,4 m, armored+ Length m 100 100

+ Bottom slope i+ Cross section Semi circle Semi circle+ Inside diameter Do m 2.6 2.6

+ Dimension h×bđ m 3.4×3.4 3.4×3.`4.

5Underground, hydropower plant,

reinforced concrete structure

- Turbine Jet Jet- Assembly quantity 2 2

- Assembly capacity MW 2×125 2×110- Mounting level/generator platform m 215/225.5 215/226.3- Dimension b×l×h m 19.8×49.6×38.2 17.6×50.15×39.4

v Water intake:

- Water intake is located on the left bank of Dak SNghe River, about 1.2 km from thehead route in Northwest. Approach spillway channel through the rock layers with rock

excavation roof is m = 0.2 m, ground excavation roof is m = 1.5 m and 2.0m; channel bottom width Bk = 16m, channel bottom level is 1.122,0 m. At the top of water intake, thechannel section has transition segment fromBk = 16 m to Bk = 9,4 m, 30 m in length.

- Water intake is in bank supported tower style, reinforced concrete structure located

on solid rock base IIA 12.7m in length, 10.4 m width. Water intake threshold level is1.123.0m, its crest level is 1.163.0 m. It is connected to the bank with an operating bridge.Water intake is in bank supporting tower style, reinforced concrete structure located onsolid rock foundation IIA is 12.7m length, 10.4m width. Water intake threshold altitude is1.123.0 m, water intake crest level is 1.163.0 m. Water intake is connected to the bank

with an operating bridge.

v Derivation tunnel:

The derivation tunnel line is excavated through IIA, IIB layer rock with tunnel

structure and separated into 4 major sections below:

- Section 1: Located behind water intake, 857.28 m in length, tunnel bottom slope is2%. Temporary reinforce tunnel portal with steel section truss I24, step 0.75m andanchor and drill tunnel crown and spray cement for remaining section. Tunnel has semicircular cross section with Do = 3.4 m, tunnel lining is reinforced with reinforce concreteis 0.3m in depth. Tunnel dimension h×b is 4×4 m.

- Section 2: Connecting with section 1 is 13.017.4 m in length. Tunnel bottom

slope is 2%. This section is excavated through solid IIA rock layer, tunnel structure iswithout armor. Tunnel cross section is in semi circular style, tunnel is 5.3 m in height,






- 1 6 -

Bđ = 4 m. Temporary reinforce in this section by anchor drilling tunnel crown andcement spray.

- Section 3: This section is excavated through bad rock area, with tunnel crestcoating about tens of meters. This tunnel section is 822m in length, reinforced concrete

structure with depth t = 0.4m. Tunnel cross section has semi circular cross section Do =4.5 m, tunnel is 5.3 m in height, tunnel bottom is 5.3 m. Temporary reinforce in thissection by anchor drilling tunnel crown and cement spray.

- Section 4: This is tunnel section without armor is 2.197.89 m in length, tunnelcross section is in semi circular style, 5.3m in height and Bđ = 4m. Temporary reinforceduring this period by anchor drilling tunnel crown and cement spray.

v Surge tank:

Surge tank has cylinder style located on the hill top with level of 1.170 m,excavated cutting through earth with excavation roof slope is from 1.5 to 1.75 andvertical excavated cutting through solid IIA rock layer. For excavated section cutting

through earth, tower is opening structured with reinforced concrete, opening sectiondiameter Do = 12 m, tower cover is 1 m in depth. Tower top level is 1.200m. For excavated section through rock, tower diameter is Do = 3,4 m with reinforced concrete

structure is 0.3 m in depth.

v Pressure tunnel:

Pressure tunnel includes 3 major sections: Behind surge tank, lowered section tolevel of 215.0 m and horizontal section connecting to the hydropower plant.

- Section 1: Behind the surge tank is 1.332.42 m in length, reinforced concretestructure is 0.4m in depth, armored. Bottom slope of this section is 2.16%, tunnel

profile has semi circular cross section R = 1.3 m, tunnel is 3.4m in height, B tunnel bottom is 3.4 m. Temporary reinforce in this section by anchored drilling tunnel crown

and cement spray.

- Section 2: The lowered section to level of 215,0 m in vertical, is 560.09m inlength, circular cross section Do = 2,6 m, with reinforced concrete structure is 0.4m inlength, armored. Temporary reinforce in this section by anchor drilling tunnel crownand cement spray.

- Section 3: Connecting to the hydropower plant is 100m in length with level of

215m to the underground plant. This section is excavated cutting through solid IIBlayer, reinforced concrete structure with armored depth, tunnel profile has semi circular cross section R = 1.3 m. Tunnel is 3.4m in height, tunnel bottom B is 3.4m. Temporary

reinforce in this section by anchor drilling tunnel crown and cement spray.v Hydropower plant:






- 1 8 -

Total

No Content of works Unit Previous

plan

Adjusted

plan

I Forest clearance m2 559.856 559.856II Excavation and filling

1 Excavation m3 5.425.626 6.189.2452 Exposed rock excavation m3 738.480 660.572

Weathered rock excavation m3 476.452 500.419 Hard rock excavation m3 262.028 160.153

3 Tunnel rock excavation m3 946.749 817.367Cross tunnel, S<=15m

2 m3 14.125Cross tunnel, S<=25m

2 m3 223.318Cross tunnel, S<=50m

2 m3 390.025Cross tunnel, S>50m

2 m3 122.404 Excavation and lowering tunnel

basem3 63.532

Inclined gallery m3 3.965 3.965 Duct furnace drilling m 736 736

4 Clay filling m3 71.376 66.4006 Mixrock/soil excavation m3 463.125 4.6007 Applied rock filling m3 617.2008 Quarry rock filling m3 945.0009 Interface filling m3 84.901 99.300

10 Ballast filtering layer filling m3 5.701 44.300III Reinforced concrete work

1 Exposed concrete m3 76.464 Dam body concrete M150 m3 4.100Concrete M150 m3 6.420

3.220Concrete M250 m3 31.535 30.724Concrete M300 m3 27.336 38.420

2 Underground concrete M250 m3 68.566 63.245Cross tunnel m3 60.243

Inclined gallery m3 3.0023 Processing, erection ton 5054 Removal of formwork ton x time 33.505

5 Reinforcement for exposedconcrete

ton 2.752,3

6 Tunnel reinforcement ton 5.762 5.361,7Cross tunnel reinforcement ton 5.100,8

Inclined gallery reinforcement ton 260,1V Other works

1 Tile stone m3

20.350 18.6002 Cement mortared stonework M100 m3 382 1.3403 Drill and reinforce exposed part m 26.453 26.453






- 1 9 -

4 Drainage drilling m 147 1475 Drilling to fill m2 30.5806 Drill and reinforce tunnel lining m 13.003 13.0037 Exposed anke strut drilling

Drilling for strut fi42mm m 2.352 Drilling for strut fi105mm m 3148 Anke steel ton 8.1009 Tunnel anke strut drilling

Drilling for strut fi42mm m 13.580 Drilling for strut fi45mm m 546.770Cross tunnel anke steel ton 1.526 1.525,8

Inclined gallery anke steel ton 34 33,5

10 Manufacture and erect tunnel AJGstrut steel

m 10.447

11 Underground steel shape ton 533.90012 Cross tunnel spray m2 340.288 283.89913 Inclined gallery spray m2 8.191

4.6. Change in demand for machines and equipment

The main hydraulic machines, equipments of the Plant are unchanged as

mentioned in the environment impacts assessment Report has been adopted. However,major specifications of these equipments are changed below:

Table 8: Major hydraulic machines, equipments of the Plant.

Main specifications

Name of equipmentsPrevious plan

Adjusted

plan

Unit Quantity

Full set Pelton turbine includinggovernor and pressure oil device

Htt=904,1m

Nt=127,55MW

N=500v/ph

Htt=844m

Nt=112.245MW

N=500v/ph

Set 2

Turbine front valve (ball valve)

D=1,6m

Htt=1250m

Q=15,98m3/s

D=1,65m

Htt=1150m

Q=14,98m3/s

Set 2

Generator

N=85MW

U=13,8kW

Cos=0,85

N=428,6v/ph

N=110MW

U=13,8kW

Cos=0,85

N=500v/ph

Set 2






- 2 0 -

Subordinate hydraulic mechanicequipment

Set 1

4.7. Change in demand for materials, fuels

- Demand for providing building materials and fuels is unchanged against previous plan, specifically:

+ Rock materials: Expect to exploit graanite mine on the left bank about 600m fromdam site 1 towards lowstream. At the plant, expect to exploit granite mine on the left

bank of Dak Lo River, about 1.5 km from the plant location area.

+ Sand gravel materials: For Dak SNghe head cluster, it's expected to be taken fromsand mine number 1 and 2 at the headwater of Da SNghe River. Sand and gravel for

the energy route are expected to be taken from Son Mua mine on Dak Drinh River inQuang Ngai province, about 35 to 40km from the plant location.

+ Soil materials: Backfilling soil is taken from the soil mine number 1 on the left bank about 1km from dam site towards dam upstream, and soil mine number 2 on the

right bank about 2km from energy route towards downstream.

- Water supply plan: Water for production, household is taken from surface water source of Dak SNghe River and Dak Lo stream nearby construction site. Industrial water is taken to the works with pump - pipeline - reservoir system. As for household water,

treated with clarifying tank system. After guarantees its quality, water is pumped intoevery household with private pump and pipeline system. Demand for water supply inareas is changed below:

Table 9: Water supply demand for production and household.

Work

No Auxiliary area UnitPrevious

plan

Adjusted

plan

Household Total

1 Auxiliary area m3/day night 7.112 7.010 102 7.112

2 Auxiliary area2

m3/day night 5.300 3.760 195 3.955

Source: Investment project for construction of Upper Kon Tum Hydropower plant.

- The selected power supply plan would be transformer station 110/220kV from KonPlong including main interconnecting line and shunt lines 22kV to supply constructionareas with power.

4.8. Change in project implementation progress






- 2 1 -

Construction progress is during 5 years from 2009 to 2014 and commissioning in2014 (previous plan was from 2008 to 2013, commissioning in 2013). Specificconstruction progress is:

- Construction year 1: Construct diversion tunnel on the right bank, excavate on dry

ground at the spillway and weir. Energy route: excavate subordinate tunnel, entrnaceand exit of the main tunnel and water intake.

- Construction year 2: Fill up Dak SNghe River, construct the main tunnel and

spillway categories, excavate main tunnel, underground section of the surge tank andvertical pressure tunnel section.

- Construction year 3: Continue to fill the dam on schedule, concrete the spillway,water intake of main tunnel and install coating steel of vertical tunnel section and start

to excavate the plant.- Construction year 4: Continue to undertake filling the weir, concrete overflow

slope, water intak, main tunnel, surge tank and the plant. Install equipments at thewater intake, main tunnel section coating steel at the plant upstream. Before December,finish filling weir and overflow concreting.

- Construction year 5: In February in construction year 5, shall lock diversion

intake and start to accumulate water. Before June shall finish construction of surgetank, main tunnel and subordinate tunnel node. Construction of energy route should befinished before August In September shall run assembly 1, in November shall runassembly 2. Complete and finish level 1 of construction in December.

4.9. Change in total investment

v Total investment of the project:

Total investment of the Project according to adjusted plan is VND 5,774,425 billionsincreased than previous project (VND 5,245 billions). Including below expenses:

Table 10: Summarized investment of the project.

No Expense category Investment (VND)

1 Construction costs 2,626,494,414,0002 Equipment costs 1,242,969,065,000

3 Compensation costs for land clearance,resettlement 209,875,394,000

4 Project management cost 30,256,410,000

5 Investment and construction consultancycosts 148,323,558,000

6 Others 771,555,285,0007 Back up cost 714,950,873,000

Total investment 5,744,425,000,000






- 2 2 -

v Source of investment:

- 30% stockholder equity from basic source of depreciation and accumulated from production and business profits.

-

70% other sources of capital.4.10. Change in compensation, resettlement

According to the environment impacts assessment report has been adopted, theresettlement area is located in Mang Canh commune upon orientation of the province.However, the expected resettlement area there is no source of water, there is small

stream but not significant so water discharge is very few. Particularly, in dry season,absolute there is no water so very difficult to supply household and production water,unable to arrange wet rice field because can't find source of water. In addition to,

resettlement area is far from administrative center of Dak Tang commune, about 1 - kmfrom the commune center. This area is convenient for traffic, arranging production landand wet rice field, administrative management within commune.

According to retention normal is 1.160m, quantity of flooded households is 82households, 228 households fewer than retention normal was 1.170m (310 households).

Land acquisition area for construction of work categories according to adjusted plan(801.8 ha), 141.16 ha reduced against previous selected plan (942.96 ha).

General evaluation:

Hence, at present, the Upper Kon Tum Hydropower Project has below main changes:

- Change in dam site location (selecting dam site 1A is 3.3 km from dam site 1 - previous selected plan towards downstream of Dak SNghe River).

- Change in main specifications of the works as above.

- Change in resettlement location.

These changes shall bring positive impacts in efficiency of work, economy -

society and environment for project area as: For selected position for construction of damsite 1 (previous plan) would be no more negative impacts on environment here, with planto adjust retention normal from 1.170m to 1.160m. This reduces reservoir area so shall

reduce flooded land area, even remarkable reduce bad impacts on natural environmentand ecology. Besides, this shall cause negative impacts on the environment at theselected area is construction site of the new dam site (dam site 1A). Those negative and

positive impacts shall be anticipated and suggested measures to minimize and settle properly in section 6 of this Report.

5. CHANGE IN REALITIES OF NATURAL ENVIRONMENT ANDECONOMIC, SOCIAL FACTORS OF THE PROJECT AREA






- 2 4 -

- Abutment on the right bank: Right river bank next to the slope about 330, up tothe level about 1.199m is the flat saddle. Entire right abutment of the dam site is

allocated within solid granite area, with following conditions of engineering geology:

+ Residual side layer edQ is 3.0 m to 6.0m in depth; powerful weathered belt IA1 is

10m to 45.8m in depth; powerful weathered belt IA2 is 1.2m in depth; weathered beltIB is 4.6m in depth with large permeability. At the bottom of belt, solid and crackedrock IIA is 10m to 25m in depth, large permeability with value q=2,2-10,8 lu (see

documents on water pressing at the bore holes).

+ In the section meeting tectonic fault IV-1 slope 800, running from upstream to

downstream cutting abutment at the level about 1.190m, angle of slope towards the river.Rock is cracked and broken up is from 5 - 10m in discontinuous width. Fault is located onabutment hardly affecting to dam stability but easy to penetrate water running to the

downstream. Underground water level fluctuates within rock belt IA1.

- River bed section: River bed at the dam site location is about 50m in width, at thelevel of 1.090m, fair even, all is allocated with solid granite. In dry season, river bed is

revealed with rock in the heave rays. Water is running strongly without alluvial layer.Weathered rock belt IB is 11m in depth, cracked solid rock belt IIA is 14m in depthwith large permeability and value q= 7,6 – 11,5 lu (see documents on water pressing atthe bore holes).

- Overflow route 1A: On the right abutment of the main dam site 1A, condition of engineering geology is as same as right abutment of the main dam site. Spillway dam cutsfrom the stream valley on upstream at the level of 1.163m over abutment on the hill top at

the level of 1.215m, hill slope is about 400. And then it cuts down to the stream mouth atdam downstream with hill slope is about 330.

v Geology of reservoir area:

Reservoir is within Dak SNghe River valley extended along with the river and branch streams. Stratum belongs to Kainozoi era, including:

- Neogen System – The Fourth: Basalt rock direct cover up weathered surface of granite is about 120 - 150m in depth. Basal rocks strong weathered forming clay layer

tens of meters in depth, bed rock is just revealed along with streams. The fourthsediments limit allocated along with Dak SNghe River valley and large streams,forming alluvial flats from 2 - 3m to less then 20m, extended to about three hundred

meters. Elements are sand, gravel and clay loams are 5 - 7m in depth.

- Magma intrusion - Hai Van Complex: Magma rocks intrude and are distributed

on entire reservoir area of Hai Van Complex. The largest fault in region is fault gradeII - 1 Dak SNghe in North and South with slope 80° towards the West, extended along






- 2 6 -

5.1.5. Change in probability of earthquake:

According to earthquake zoning map (Vietnamese Construction Code, vol 3 -

1997), the study area is within the geographical pole vibratory area Imax <6 (MSK – 64), that is earthquake acceleration a = 0,06 – 0,07 g. So, until now the plant area is

within Kon Tum corbel piece center does not detect any remarkable change againstmentioned in environmental impacts assessment report has been adopted.

5.1.6. Change in mineral:

Until present, upon permission of the People's Committee of Kon Tum province withthe official dispatch No. 354/UBND-KTN dated 15th March 2011 on exploitation of

building materials within the range of work. At the construction site of diversion work

(with coordinate: X = 1625433, Y = 0578357) and flood spillway (with coordinate: X =

1624889, Y = 0578523) of the Upper Kon Tum Hydropower Plan, Construction JointStock Company 47 is undertaking exploitation and taking all of building stone withvolume of exploitation is nearly 220.000 m3.

In addition to, metal minerals in the group of gold, silver and multi-metal: Accordingto analysis results of the

In addition to, metal minerals in the group of gold, silver and multi-metal: According toanalysis result of Geological Federation of the Central Highlands provinces indicate that there isno metal as gold appeared in analysis samples. Contents of Cu, Pb and Zn are very low.

· Rare metal minerals: The Plasma (ICP) analysis samples indicate that contents of Sn,Mo and W are very low. Do not discover mineral containing Molybdenum and Wolfram.

· Radioactive metal mineral: Project area does not discover radioactive abnormal

Hence, until present, there is no any remarkable change against mentioned in theenvironmental impacts assessment report has been adopted.

5.2. Change in hydro meteorological condition

5.2.1. Change in climate, meteorology:

All changes happen within the range of Dak Tang, Mang Canh, Ngoc Tem andMang But communes of Kon Plong district and Dak Doi commune of Kon Ray district.In general, therefore, conditions of temperature, rain regime and humidity areunchanged. However, because free surface area of reservoir is reduced from 8.6 km2 to

7.081 km2, so total annual evaporation reduced to 6 mm than before.

Based upon distribution of average piche evaporation during period of 1977 -

2004 at the meteorological stations on basin of Se San River and piche evaporation

distribution model in Kon Tum to calculate loss rate of evaporation loss ratio of the






- 2 7 -

basin. Evaporation on reservoir surface of Upper Kon Tum Hydropower for months(DZ) is distributed upon below table:

Table 11: Evaporation on reservoir surface of Upper Kon Tum Hydropower

(mm).

Months I II III IV V VI VII VIII IX X XI XII Year

DZ 48.6 51.9 61.2 49.9 33.5 21.1 19 17.2 17.3 24.8 34.8 43.1 422.4

Source: Investment project for construction of Upper Kon Tum Hydropower.

5.2.2. Change in hydrographic characteristics:

Due to change in location of dam site, so there are some changes in hydrographiccharacteristics below:

Total basin area of Dak SNghe River combining with basin of Dak Bla River isabout 960 km2. In which, taking into account of dam site 1A Upper Kon Tum increasedfrom 350 km2 to 374 km2 making up about 38.95% river basin area. River bed is relative

narrow, from 10 - 15m width in dry season and 50 - 70m in width in flood season.

Table 12: Morphological characteristics of river basin to dam site 1A.

Route Fl v (km2) Ls (km) B (km)

D

(km/km2)

Ztblv (m) Js (%0)

UpperKon Tum

374 44.5 8.4 0.415 1.384 7.05

Source: Investment project for construction of Upper Kon Tum Hydropower.

- Yearly current: Based upon data of Kon Plong meteorological station from 1960 -2005, sequence of current up to dam site 1A is specified with following formula:

tv

td tvtd

F

F QQ =

In which:

+ Qtd: Calculated discharge value at dam site (m3/s);

+ Qtv: Discharge value at the hydro meteorological station (m3/s);

+ Ftd: Basin area up to dam site (km2);

+ Ftv: Basin area up to hydro meteorological station (km2).

Calculation results of average annual current during period of 1960 - 2005 of thedam site 1A are Q

o1A=16,2m3/s increased to nearly 1.0 m3/s than before.

- Design annual current:






- 2 8 -

From results of hydrographic average annual flow series of Upper Kon Tum plantroute, calculate hydrographic annual flow corresponding with design frequencies at theroute below:

Table 13: Characteristics of hydrographic annual flow of the plant route

Qp(m3/s)

RouteFlv

(km2)

Q0

(m3/s )

Mo

(l/skm2)

W0

(106m

3)

Cv Cs/Cv10% 50% 90%

1 350 15.2 43.4 479 0.18 2 18.7 14.9 11.7

1A 374 16.2 43.3 510.9 0.14 2 19.7 16.6 13.8

Note: F: Basin area, Q0: Annual standard flow, W o: Total annual flow volume C v: fluctuation

ratio, C s: differential ratio.

-

Flood flow:From the largest daily raining document measured at Kon Tum station, calculate

peak of flood upon Xocolopxki's formula:

ng

l

P MaxP Q Ff

T

H H Q +

-= d

a t )(278,0 0

In which:

nP P H H ´= t t y

+ HnP: Design largest daily rainfall of Kon Tum station.

+ t y refer relationship )(t y ~ τ with τ = tl, for basin of rivers in the North of

Highlands are of Gia Lai, Kon Tum and Đăk Lăk provinces, refer to table 5-14of the textbook “Engineering hydrograph” published by the Water Resources

University in 1993.

+ α: Flood flow coefficient

+ Tl: Flood rise period

+ f: Flood pattern coefficient calculated upon actual measured flood documentfrom 1994 to 2004 of Kon Plong station.

+ H0: Primary losing water layer.

+ δ: Coefficient taking into account of influences of lakes, ponds and swamps.

+ Qngầm: Underground flow volume.

+ At Upper Kon Tum dam site 1A:

Because impacts of climate change, flood happenings on head water of Se SanRiver is fair abnormal, especially historical flood in September 2009 suddenly changed






- 3 0 -

Qmaxp% (m3/s) gapS2 301.1 236.4 209.4 148.1 121.5 94.9

- Total design flood discharge:

From extracted flood document of Kon Plong station during period of 1994 -

2005, calculates total largest flood volume during 1, 3 and 5 days. Establish correlativerelationship between Qmax and Wmax of Kon Plong station, correlative equation hasfollowing type:

W1max = 0.0557×Qmax + 1.434; r = 0.94

W3max = 0.0851×Qmax + 10.784; r = 0.81

W5max = 0.1066×Qmax + 18.561; r = 0.73

Total design flood volume of dam site 1A is calculated upon quantitative

correlative relationship of Kon Plong station, results are presented in below table:

Table 17: Total design flood volume at dam site 1A

Wmaxp (106m

3)

Qmaxp% (m3/s)

W1max W3max W5maxP

(% ) 1

(previous

plan)

1A

(adjusted

plan)

1

(previous

plan)

1A

(adjusted

plan)

1

(previous

plan)

1A

(adjusted

plan)

1

(previous

plan)

1A

(adjusted

plan)

0.1 2.522 2.650 141.1 149 223.9 236 284.6 301

0.5 1.838 1.931 103.4 109 166.5 175 213.1 224

1 1.592 1.672 89.9 94.6 145.9 153 187.5 197

3 1.232 1.294 70.1 73.5 115.7 121 149.9 156

5 1.077 1.132 61.5 64.5 102.7 107 133.7 139

10 889 935 51.2 53.5 86.9 90.3 114.1 118

- Low water flow:

Design peak of flood during dry season months at Upper Kon Tum dam site iscalculated with peak of flood modulus reduction formula upon area from Kon Plong

hydrographic station, presented in below table:

Table 18: Peak of flood discharge during dry season months at dam site 1A

Qmaxkp (m3/s )

Month

5% 10% 20%I 49.6 41.6 33.5






- 3 1 -

II 24.1 22.1 19.8

III 38.9 31.5 24.3

IV 42.1 34.4 26.7

V 98.7 81 62.4VI 247 168 100

VII 140 119 94.4

I - VII 271 198 136

5.3. Change in element of natural environmental realities

For obtaining basis for evaluating realities of environmental quality andforecasting impacts on the local environment would happen as undertaking

construction and commissioning the Upper Kon Tum Hydropower project, uponadjusted plan. We undertake survey, measurement and sampling to analyze water andair environmental criteria at project area. Following is specific analysis results:

5.3.1. Air and micro climate environment:

Table 19: Measurement and analysis results of air and micro climate environment.

Analysis resultsNo Criteria Unit

QT/K 54 QT/K 55 QT/K 56

Allowable

limit

1 Temperature 0C 24 26 25 -

2 Humidity % 60 59 61 -

3 Wind speed m/s 0,3-1,1 0,3-1,2 0,4-1,0 -

4 Noise dBA 60,5 57,5 60,0 70(1)

5 Vibration dB KPH KPH KPH 75(2)

6 Floating dust µg/m3 60 65 62 300(3)

7 CO µg/m3 890 990 980 30.000(3)

8 SO2 µg/m3 41 42 40 350(3)

9 NO2 µg/m3 32 35 37 200(3)

Note:

- Mark (-): Not mentioned in code.

- KHP: Undiscovered

- QT/K 54: Sample is taken at dam site 1A of the Plant. Coordinate (VN 2000):






- 3 4 -

Tum Hydropower Plant, Dak Tang commune, Kon Plong district, Kon Tum province.Coordinate (VN 2000): X = 1635150; Y = 0577650.

- QT/N29: At the underground water hole within energy route area of the Upper Kon Tum Hydropower Plant, Dak Tang commune, Kon Plong district, Kon Tum

province. Coordinate (VN 2000): X = 1637401; Y = 0594620.

- KPH: Undiscovered

- QCVN 09:2008/BTNMT: National technical regulation on underground water quality.

Remarks:

According to underground water analysis results at the construction site of Upper

Kon Tum Hydropower plant and resettlement area upon adjusted plan, indicate that

almost specific targets for underground water quality are within allowable limit of national technical regulation on underground water quality - Vietnamese Code QCVN09:2008/BTNMT, except for Coliform target exceeding allowable limit of the codefrom 1.33 to 2 times.

5.4. Change in economic - social condition

For obtaining basis to evaluate environmental impacts on local economic and social

conditions at project area upon adjusted plan of Upper Kon Tum Hydropower plant, we

shall collect information of economy and society at project in Kon Ray and Kon Plongdistricts, where is under many influences from implementation of project as following:

5.4.1. Economic - social condition in Kon Ray district:

5.4.1.1. Economy:

- Annual plant area: Field rice is 554.26 ha; mountain field rice is 580.6 ha; Indian

corn is 915 ha; food trees are 81.01 ha.

- Industrial plant area:

+ Short-term industrial plant: Almost is sugar cane has are under crop is 61ha/58.8ha, acquired 103.74% according to plan.

+ Long-term industrial plant: At present, has 2.023.44 ha/1.766.24 ha, in whichalmost rubber tree, pepper tree, coffee tree, cashew tree and other fruit trees.

- Breeding: Total estimated head of cattles and fowls to implement is: 67.709

/55.409 units, in which: Herd of buffalo: 222/209 units; cow: 5.727/6.083 units; pig8.362 /9.291 units; goat 1.064/1.380 units; fowl 52.334/38.446 units.

- Foresty: At present, 96 households were assgined to manage, protect 2.625 ha forest(almost is ethnic minority people living nearby forest) and afforest 243.2 ha of production






- 3 6 -

and goat 1758 units. Epidemic situation on the whole district is in tendency towards toreduce against previous years.

- Forestry: Deforestation situation for making fields in the mountains and illegalexploitation, transportation of forest products still happen, especially in Mang Canh,

Dak Long and Hieu communes etc

5.4.2.2. Culture, society:

5 Population: Average population density of the whole district in 2010 wasabout 18.886 people with 4.970 households. Family planning work is usually

disseminated to every hamlet and villge within communes and towns. Ethnicgroup element: Xơ đăng: Making up 48.9%, Ba Na: Making up 13.2%, others:Making up 6.4% and Kinh: Making up 31.5%.

6 Education: Total teachers are nearly 528 people. Total pupil of the district is5.692 pupils. Material facilities for education work are attached special importanceto and interested to, with a view to meet teaching and learning demands of pupil butnot significant. At present, there are 349 classrooms.

7 Health: Medical personnel team is about 127 people, organizedexamination and treatment for 10.002 patients. Examination and treatment work is improved.

8 Culture: Organize propaganda about guideline of the Party, law and

policies of the State. Organize celebration of the great public holidays of thecountry, public culture performance activities, establish gong craftsman team in

both Dak Long and Mang Canh communes. Strengthen to promote and attractinvestment in Mang Den ecotourism area.

9 Social security and order: Political security situation is always be keptstable, serious execute guidelin, policies of the Party, law and Policy of the State.

The key areas, political and religious subjects are under close management.

In addition to, as the project performed shall undertake compensation for landclerance and resettlement. Residential area would have to remove (82 households) inDak Tang commune, Kon Plong district. The resettlement area is next to theadministrative center of Dak Tang commune, about 1 - 2 km from commune center.

The report shall give general presentation of economic - social development situationof Dak Tang commune as a basis for assessment of environmental impacts oneconomic - social life of the resettlement area in project.

5.4.3. Economic - social conditions of Dak Tang commune:

5.4.3.1. Economy:

v Agricultural production:






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- Winter and spring rice: Total production sector of Winter - Spring harvest in 2010- 2011 cultivated by people is 31 ha.

- Corn and cassava trees cover a plantation area of 20 ha.

-

Kinds of vegetable and bean: plantation area is 11 ha.- Perennial: Cover an area of 69 ha.

- Breeding: Total head of cattles and fowls within commune: 1.350 units. In which:Buffalo: 734 units; cow: 45 units; goat: 46 units; pig 525 units. Present total fowl is3.120 units.

v Forestry: Unchanged and fair good execute law on protection and development

of forest so limited deforestation for making fields in the mountains.

v Transportation, hydraulic:

- Transportation: Officials, party members and people of the commune expanded,

lowered slope, adjusted route, filled up fallen slope and repaired welfare bridges on thesection from Dak Tang hamlet to Dak Pro hamlet is 10 km in length and the route is1.5m in width and 2km in length from Vi Ro Ngheo hamlet to Dak Sa hamlet. At

present, within the commune there are 5 hamlets finished construction of highway andthree hamlets finished construction of motorway to the villages.

- Hydraulic: Formerly the commune has bought rock cage and water pipe to repair

small hydraulic works of 8 hamlets. At the same time, directs the hamlets to dredge,reconstruct existing canals and ditches to guarantee irrigation for winter, springharvests as well as crop.

v Material facilities: At present, within the commune is undertaking constructionof following works:

- Vi Xay - Mang But flood prevention road

- Entrance into resettlement area 2 at Vi Rin and Dak Tang hamlets

- Working building of Dak Tang Junior High school

- Working building of Dak Tang Medical station

5.4.3.2. Culture and society:

- Population: At present, within the commune there are 291 households with 1.397

people. Ethnic group element: Xơ đăng: making up 49.7%, Ba Na: making up 16.5%,others: making up 4.5%, Kinh: making up 29.3%. In general, commune population isuneven distributed, they're almost farming to earn their living with backward

cultivation level, low productivity.






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Education: In the school year 2010 - 2011, within the commune there is total 48teachers are working at the study grades. In which: Primary education: 23 teachers,Junior high school: 13 teachers, 4 managers and 1 accountant. Total pupil at the studygrades is 284 pupils. In which: Pre-school: 05 classes with 70 pupils; primary

education: 15 classes with 154 pupils; Junior high school: 03 classes with 48 pupils. At present, the whole commune there is 23 classrooms, in which 19 reinforced classrooms, 02 semi-reinforced classrooms and 02 temporary classrooms.

Health: Medical personnel team are regular members of the station are 5 people, inwhich 02 physicians, 01 druggist, 01 nurse and 01 midwife.

Culture: Propagandize policies of the Party and State to the people, especially policies bringing direct benefits to the people, construct cultural, prosperous and

powerful hamlets and villages .

Security, national defence: Political security is always stable and be maintained,complicated cases did not happen. Officials and people serious execute guideline of theParty, laws and policies of the State.

General evaluation:

v Advantages:

- Land, ground and climate conditions are very convenient to develop agriculture,geological location is very convenient for goods transportation.

- Having enormous potentiality to develop tourist and service industries, as motive

power for diversified development of industrial and home industrial professions.

- Infrastructures as electricity, road, school, station and welfare works within thesedistricts are invested in and improved.

- Cultural and spiritual life as well as in production of people were significant increased,contributed to undertake and getting high results in poverty alleviation in region

Nevertheless, besides advantages and acquired achievements, certain difficultiesstill exist.

v Difficulties:

- Awareness of people is limited, some people still rely on the State.

- Limited qualifications of officials from hamlet, village to commune.

- Some invested works within region stored too badly by people to obtain goodresults during period of use.






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- The investment programs to support living, agricultural economic models,scientific and technical transfer are widely performed on a large scale, but application

results after project are not as expected.

In general, in order to make use effectively potentialities for economic

development in general, rural agricultural economic development in particular, of the project area as well as resettlement area, the Company shall cooperate with the localgovernment to undertake:

- Building up qualifications for personnel team, training to improve qualificationsof people

- Enhancing investment in construction of production models for people to learnand transfer science and technology

- Mobilizing and inserting sources of development investment for some essentialinfrastructures as: Welfare works are electricity, road, school and station up to the

hamlet and village

- Developing investment in hydraulic works

- Maintaining and developing cultural institutions of native culture, little by littlecreate good conditions for people to access, enjoy and create premise for development

of agricultural economy and rural economy with the existing potentialities.

6. CHANGE IN ENVIRONMENTAL IMPACTS AND MEASURES TOMINIMIZE NEGATIVE IMPACTS OF THE PROJECT

6.1. Change in environment impacts of the project

In basically, negative impacts on the environment shall be less changed againstwhat mentioned in the environmental impacts assessment Report of the Upper KonTum Hydropower Project has been adopted upon Decision No.1718/QĐ-BTNMTdated 29th August 2008 of the Ministry of Natural Resources and Environment.

Nevertheless, because change of the aforesaid main specifications of the project,hence sources of impact, scale and level of impacts on environment are also changed.

In this Report, we shall specific evaluate environmental impacts properly with present situation of the Project.

6.1.1. Preparation and construction period:

6.1.1.1. Change in impacts because of waste:

During this period, the impacts because of waste mostly occur due to dust from

rock excavation work for construction of works at pressure route and energy route,dustand polluted gases,noise from machines, vehicles, household wastewater, construction






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waste, household solid waste, construction waste and a quantity of exhausted greasefrom maintenance of machines, equipments etc. These impacts are not remarkablechanged against previous selected project (in load, level of pollution and impactsuffered objects have been anticipated in the environmental impacts assessment Report

has been adopted). In addition to, according to environmental realities observationalresults at Project area as per section 5.3, environmental quality at the project area thereis no sign of pollution. This demonstrates that environment in project area is not

suffered bad impacts from activities here.

6.1.1.2. Change in impacts not because of waste:

v Change affecting to ecological system:

Impacts on ecological system are not changed against what mentioned on the

environment impacts assessment Report has been adopted. Nevertheless, according toadjustment plan, flooding area of Dak SNghe Lake is 708.1 ha, reduced 151.86 haagainst previous selected plan (859,96 ha). Fauna on this area is no longer sufferedfrom bad impacts on faunal at reservoir area as before.

v Change affecting to economic - social life:

- Damage in land: For changing according to retention level plan is 1.160m,damaged land area in Dak Tang, Mang But, Mang Canh and Ngoc Tem communes in

Kon Plong district and Dak Koi, Kon Ray district are 801.8 ha, reduction against

previous plan (942.96ha).

- Damage in housing, public works and infrastructures:

For retention level adjustment plant is 1.160m, according to investigation figuresin November 2007, houshold number whose flooded land is shown in below table:

Table 22: Statistics of household number whose flooded land.

Statistical figures

Previous plan Adjusted planNo Place names

Householdnumber

Peoplenumber

Householdnumber

Peoplenumber

Dak Tang commune 279 1.211 82 379

A Agricultural household 267 1.174 77 3681 Hamlet 1 (Vi Rin 1,2) 28 1352 Hamlet 3 49 233B Non-agricultural household 12 37 5 111 Hamlet 1 (Vi Rin 1,2) 2 52 Hamlet 3 3 6

Mang But commune 31 152

A Agricultural household 31 152Total 310 1.363 82 379






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Hence, household number whose flooded land is much reduced against previousselected plan (310 flooded households).

6.1.1.3. Change in risk of environmental problems:

In few years backwards, due to weather change caused unforeseen disasters. In

2009, because impacts of climate change, flood happening on head water of Se SanRiver was fair abnormal, especially in September 2009 caused historical flood andsuddenly changed flood regime on Se San River and flood to Upper Kon Tum dam site.The project area and neighboring areas were suffered from which with serious

economic and social damages. Figures of peak of flood in September 2009 as below:

Table 23: Height of peak of flood in September 2009 at the hydrometeorological

stations of Kon Tum province

Hydrometeorologicalstation

Height of peak of flood

(cm)

Appearance period Against alarm 3Againstlargest

flood

Kon Tum 52415 23:00 PM 29th Sep 2009 Larger: 414 cm 113 cm

Kon Plông 59720 21:00 PM 29th Sep 2009 Larger: 419 cm 107 cm

Đăk Tô 59013 19:00 PM 29th Sep 2009 Larger: 264 cm 133 cm

Đăk Mốt 58165 23:00 PM 29th Sep 2009 Larger: 702 cm 229 cm

Source: Steering Committee for flood prevention of Kon Tum province

This proves that project area shall have potential impacts from natural factors as

dilluvial rains eroding rock and causing industrial accidients; break down of border dike may happen upon presentation of flood with frequency exceeding flood frequencyduring construction period. Therefore, the Company shall take measures to preventthose during months of rain and stom during both construction and commission periodof the project.

6.1.2. Water accumulation and operation period of the plant:

6.1.2.1. Change in impacts because of waste:

The environmental impacts assessment Report has been adopted does not includeassessment of waste, the additional environmental impacts assessment Report shall

assess impacts on natural, economic - social environment during this period, accordingto below new plan:

v For sources of dust and exhausted gas:

Operation of the transport means: Mostly occur from the transport mean meeting

and seeing off about 50 officials and works to and from the plant. Estimate quantity of vehicles go in or out of the plant is 5 trips/ day in average, almost used fuel is Diezenoil (S = 0.25%) shall exhaust to the air environment quantity of exhaust fume

containing pollutants as: dust, NO2, SO2 and CO.






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Base upon pollution factor stipulated by the United States EnvironmentalProtection Agency (USEPA) and World Health Organization (WHO), load of

pollutants exhausted to the air environment by vehicles on transporting road section atthe average distance of 100km, is calculated below:

Table 24: Pollution load of the vehicles.

No PollutantPollution factor

(kg/1000

km/vehicle)

Load (E)

(mg/m.s)

1 Dust 0.07 4.05.10-6

2 SO2 2.74*S 0.4.10-6

3 NO2 2.25 1.3.10-4

4 CO 6.0 3.45.10-4

Above calculation results indicate that load of pollutants exhausted by thevehicles is very low. It is because during this period, frequency and quantity of vehiclesgo in or out of project area is small. Therefore, impact of exhausted gas from those onenvironment is not remarkable.

v For source of noise:

Noise occurs from activities of generator for project and turbine engine as

running, it's also from flood discharge process of the plant. Noise level from those isabout 90 - 100 dBA (according to survey document at some hydropower plants as

Yaly, Son La, Da Nhim etc.

To evaluate impacts of noise on surrounding environments, use calculation

method of spread of noise from many different sources, specifically:

L = L p - DLd - DL b - DLn (dB)

In which:

+

L : Noise spreading to calculation point in surrounding environment.+ L p: Noise level of source of noise.

+ ΔLd - Noise level reduces upon distance d at the frequency i, ΔLd = 20lg [(r 2/r 1)1+a]

r 1 - Distance to source of noise corresponding of Lp (1 m)

r 2 - Calculation distance of reduction degree of noise level corresponding to Li (m)

a - Coefficient taking into account of effect of noise absoprtion of land terrain(a = 0)

+ DL b: Noise level reduced as spreading through obstacle (cladding structures,

row of green trees and retaining wall), DL b = 0






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+ DLn: Noise level is absorbed by air and surrounding surfaces, DLn = 0

Table 25: Noise level at some distances (taking into account of spread of noise).

No Noise level of source(dBA)

Noise level is 3m

from source of noise (dBA)

Noise level is

5m from sourceof noise (dBA)

Noise level is

10m fromsource of noise

(dBA)

1 90 - 110 80.46 - 90.46 76.02 - 86.02 70 - 80

2 TCVN 3985:1999 85

Note: - Vietnamese Standard TCVN 3985:1999: Noise standard for production sector.

From above calculation results, indicate that in the scale of smaller than 10mlarger than allowable limit according to noise standard for production sector -

Vietnamese Standard TCVN 3985:1999. Therefore, it shall affect to employees' health,reduce listening ability and then reduce work efficiency and productivity.

v For source of household wastewater:

Household wastewater: Almost appeared from living activities of officials andworkers at the project area. This source of wastewater containing a fair large amountof pollutants as residues, suspended solids (SS), organics (BOD, COD), nutrients

(N,P) and microbes. Accumulation of wastewater on land, inside land and evensource of surface water shall pollute the surrounding environment. This also a reasonwhy causing contagious epidemics.

For about 50 officials and workers working at the plant, water demand for living purposes is nearly 5m3/day (100 liters/ person in average), wastewater quantity occursis 4m3/day (wastewater capacity is equal to 80% supplied water capacity). According

to rapid evaluation method of S.J. Arceivala, volume of pollutants exhausted to theenvironment by one person every day is presented in below table:

Table 26: Dirt load/person/day/night

No Pollutants Load (g/person/day/night)Load

(g/day/night)

1 BOD5 45 – 54 2.250 – 2.7002 COD 72 – 102 3.600 – 5.1003 TSS 70 – 145 3.500 – 7.2504 N – NH4

+ 2.4 – 4.8 120 – 2405 Non-mineral grease 10 – 30 500 – 1.5006 Total N 6 – 12 300 – 6007 Total P 0.8 – 4 40 – 200

8 Coliform 10

6

– 10

9

5.10

7

– 5.10

10

Table 27: Concentration of pollutants in household wastewater without treatment.






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No PollutantsConcentration of pollutants

(mg/liter)

QCVN

14:2008/BTNMT

(Colum B)

1 BOD5 562.5 – 675 60

2 COD 900 – 1.275 -

3 TSS 875 – 1.812.5 120

4 N – NH4+ 30 – 60 12

5 Non-mineral grease 125 – 375 24

6 Total N 75 – 150 -

7 Total P 10 – 50 -

8 Coliform 1.25.107 – 1.25.1010 5.000

Note:

- QCVN 14:2008/BTNMT- National technical regulation on household wastewater.

- Applying coefficient K =1,2 for production base less than 500 people, C max = C x K.

Above calculation results indicate that concentration of all pollutants in untreatedhousehold wastewater exceeding allowable level in many times against QCVN14:2008/BTNMT. As presenting at the source of receiving, wastewater shall increase

concentration of pollutants in water and pollute source of surface water in region,affecting to environment and causing reversal impact on human, for instance:

+ The organics at high concentration shall cause reduction of concentration of dissolved oxygen in water because micro-organism uses this oxygen capacity to

decompose organics. Dissolved oxygen quantity is reduced to under 50% saturationshall affect to existence and development of aquatic species. Low oyxgen capacity alsoreduce self- cleaning probability of the river.

+

Suspended solid (TSS) is the agent causing negative influences on aquaticresources asw ell as photosensitive harms, such as: Increasing turbidity of source of water and aggradate river bed and reservoir foundation. High TSS is one of the causes

affecting development of ephemerous animal and plant.

+ Nutrients (N, P): As too high concentration of nutrients is not remove, shalleutrophication the source of receiving wastewater. At that time, aquatic plant species

strong grow up and die, and then decay polluting the source of water.

+ Micro-organisms within dung: Bacteria, virus, mushroom, protoplast and parasitic

worms etc are germ types may be spread through water environment and penetrate intohuman body and may cause diseases.






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within Western Highlands and its depth although increased about 0.35m highe than before, but not remarkable. Hence, it shall have similar features as above lakes.

- Degree of mineralization of water: Base upon some observational documents of some reservoirs that commissioned such as: Dau Tieng, Tri An and Hinh River Reservoirs

presented that which of natural river water and reservoir water is similar with each other or increased but very little, from3-5%. However, reservoir water is seasonal changed, degreeof mineralization increases in flood season but decreases in dry season. Hence, may

similar forecast for the Upper Kon Tum reservoir, although changes in capacity, area anddepth, but degree of mineralization there is no remarkable fluctuation and not changedmuch more than Dak SNghe River water and would be seasonal changed.

- Nutrients and organics: Dissolved oxygen indicate (DO) has close relation to the biological decomposable organics. After forming reservoir, the nutritional regime and

organics in reservoir would be remarkable changed and close relating to the biological andchemical processes in reservoir foundation. In water ecosystems, reduction of dissolvedoxygen content close depends on reservoir foundation cleaning up. Once reservoir iscleaned up carefully, dissolved oxygen content is little reduced and vice versa.

To forecast dissolved oxygen quantity in Upper Kon Tum Hydropower reservoir,it's necessary to calculate needed oxygen quantity to oxidize all organics of plants andsoil in reservoir foundation, by using empiric formula of A.I.Denhinova below:

O2 = (K 0 đất x S đất + K 0tv x Dtv)/1.000In which:

+ O2: Necessary oxygen quantity to oxidize all organics decomposed fromflooded plants and soil in reservoir foundation

+ K 0 đất: Empirical coefficient presents necessary oxygen quantity to oxidize allcomposed organics in 1 ha flooded soil in reservoir foundation. For tropical soil K 0 đất

= 48.8 kg/ha.

+ K 0tv: Empirical coefficient presents necessary oxygen quantity to oxidize alldecomposerd organics in a ton of flooded plant in reservoir foundation in dry basis.

For timber body (body, branch and root): K 0tv = 9,4 kg/tấn; for leaves and gress:K 0tv = 6,0 kg/ton.

+ S đất : Reservoir area

+ Dtv: Biomass in absolute dry basis of the flooded plants in reservoir foundation.

Estimated total biomass of flooded plant types in Upper Kon Tum Hydropower reservoir is: 15.061.47 ton. Hence, oxygen quantity to oxidize organics of plants and

soil in reservoir foundation is:






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O2 = (K 0 đất x S đất+K 0tv x Dtv)/1.000

= (48.8 x 708.1+10.994.87 x 9.4+4.066.597 x 6.0)/1.000 = 162.307 tấn.

For dissolved oxygen concentration in reservoir is 6.01 mg/l (equivalent todissolved oxygen concentration in Dak SNghe River) and total reservoir capacity is

145.52 millions m3, total DO quantity in reservoir would be 874.575 ton. If it'snecessary to oxidize all recycled biomass during cleaning up process until period of water accumulation is 712.269, equivalent to 4.9 mg/l.

However, if reservoir foundation is careful cleaned up before storing water inreservoir, remove all trees with big trunks, branches, leaves and gress. At that time,remained biomass quantity would be recycled vegetable biomass quantity about 3.012.294

ton. Oxygen quantity must be spent to oxidize all organics in reservoir is 52.63 ton,

remaining oxygen in reservoir would be 821.946 ton equivalent to 5.65 mg/l.Therefore, as reservoir foundation is careful cleaned up, water quality (dissolved

oxygen concentration) although reduced against before reservoir is made, but water

quality is still assured for vegetation types living in reservoir.

- Ability to eutrophicationize: This phenomon if happens shall mud water withcolors and fishy smell because of serial kill of seaweed, shall increase BOD, COD and

NH4+ and re-contamination. On the other hand, deposit of seaweed and phosphorous

compounds shall make reservoir getting old rapidly because of disintegration process

of biological products depositing a lot of sluidge and organices. Water environment isgradually becoming fastidious and reduce water quality in reservoir foundation

affecting to which at the downstream area.

Eutrophication probability of the reservoir may be evaluated as following:

It's also based upon reservoir foundation before storing water in reservoir:

ü Plan 1 (P1): Maintain fauna realities.

ü Plan 2 (P2): Clean up and chop about 50% fauna volume.

ü Plan 3 (P3): Clean up and chop about 75% fauna volume.

Base upon allowable maxium load of phosphorous in reservoir of Vollenwinder (1976):

Lc=10qs * (1+(D/qs)0,5); qs=Q/A

In which:

+ Lc: Standardized phosphorous load to mg P/m2, if it's increased to 2 - 3 times,reservoir eutrophication phenomenon would happen.

+ qs: Running speed through reservoir (72.148 m/year).






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416 mm/year, at that time, total evaporation would be 1.827.3 mm. Hence, micr-climateregime at project area is improved certainly and not changed so much than before. Pureand cool air, high air humidity stimulates development of trees need sun light, developesmore some trees adapting with the new climate conditions. A part of fauna surrounding

project area is stable restored early, bringing back natural surface landscape as the initialstate. In general, as the reservoir is commissioned, shall contribute to improve subareamicro-climate of remarkably and this impact shall last during existence of reservoir.

v Change in hydrographic regime of flow:

The Upper Kon Tum hydropower plant has basin area increased from 350 km2 to374 km2 and reservoir capacity reduced from 173.7 millions m3 to 145.52 millions m3

changing initial current regime of Dak SNghe River. Hydrographic regime shall be

changed basically from river type into reservoir type. In every year, water level of

reservoir would change from dead water level (1.138m) to retention level (1.160m).And then, it shall have impact on ecosystem as well as ability to supply basin of Dak

SNghe River with water from dam site 1A and basin of Se San River, specifically:

Ÿ Impact on water using issue of Se San River:

- For Se San River basin: Se San River is one of the large branches of Me KongRiver basin, originated from the mountainous region in the North of WesternHighlands in Vietnam, and then running to Cambodia. Main river is 237 km in total

length, basin is 11.450 km

2

in area, entire Se San River is within Gia Lai and Kon Tum provinces. Hence, basin area up to dam site 1A location made up about 3.27% Se SanRiver basin area. Therefore, moving water to Tra Khuc River basin shall reduce flowdischarge of Se San River. According to study figures of step planning for Se San

River hydropower and Upper Kon Tum hydropower plant project, indicated thatconstruction of this hydropower plant and moving water to Tra Khuc River basin shallreduce approximately 270 GWh/year (270 millions kwh/year) of all 4 hydropower

plants are now operating on Se San River are Yali, Se San 3, 3A and 4. However, after Upper Kon Tum hydropower plant is commissioned, shall generate about 824.2millions kwh/year (after deducting from reduction of the plants). In general, althoughmoving water to Tra Khuc River basin and for the purpose of power generation for thecountry, but shall affect to flow on entire Se San River basin. From that point, shallaffect water supply to generate power for the hydropower plants on this river,

nevertheless, benefits from moving water and very large quantity of generated power,therefore, construction of the Upper Kon Tum hydropower plant is conforming to theOfficial dispatch No. 496/CP-CN dated 07th June 2001 of the Government on adoptionof step planning for Se San River.

- For Se San River basin area: Upon change in main figures of the Upper Kon Tumhydropower plant, shall not change its flow rate as running to Cambodia. According to






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calculations, its smallest monthly flow rate (dry season) after commissioning Se San 4hydropower plant and combining with Sa Thay River about 104.5m3/s, meanwhile itsnatural flow is about 45.1m3/s. Thus, after running to Cambodia, it is not only notreduced but also increased especially in dry season.

Ÿ Impact on environment and ability to supply water of Dak SNghe River basin:

- For environmental aspect, for ecosystem at the river section just behind the dam:

According to Tennant method - evaluation method upon capacity percentage left by theriver after regulation, it's considered as necessary to maintain structure and functions of water ecosystem.

Table 29: Necessary flow to maintain river condition with Tennent method.

Average flow percentage (% ) River capacity level (m3/s )Living condition

maintaining goal Dry season Rainy season Dry season Rainy season

Outstanding noteworthy 40 60 1.904 11.22

Excellent 30 50 1.428 9.35

Good 20 40 0.950 7.48

Moderate or reduced 10 30 0.476 5.61

Poor or smallest 10 10 0.476 1.87

Serious reduction 0 - 10 0 – 10 0 – 0.476 0 – 1.87

According to this method, flow is minimum maintained to 10% to guaranteeexistence and development of underwater ecosystem. Upon calculations of the Institute

of Water Resources Planning, average capacity of Dak SNghe River in dry season is4.76m3/s. At times of impounding, should consider flow rate of the river section

combining with the weir with Dak Bla River is about 58.7 km in length would bereduced. Nevertheless, this river section has many stream branches entered into withaverage capacity in dry season is 2.8 m3/s (including combination with Dak A Koi

stream).

The river section just behind previous dam site is about 8km in length with flowrate is changed from 0.05 m3/s to 0.476 m3/s may be reduced remarkably, especially in

dry season. From that point, it shall affect ecosystem in regional and may have badimpact on living environment and prevent migration of aquatic creatures. Nevertheless,upon new adjusted plan, its length before stream branches entering into is shortened

about 4.7 km, so impact level on ecosystem is reduced than before. The next river section is about 54km in length with flow rate is apprximately 0.476 m3/s and more,therefore, there is no remarkable impact on ecosystem at this river section.

- Ability to supply water:






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+ For the river just behind weir is where has slope mountainous and abrupt terrainin Kon Plong district, no residential area is arranged, there is no farming land(investigation figure in 2007), hence, moving water to Tra Khuc River basin shall nothave impact on water supply here.

+ The riverside area and neighboring area towards dam site basin, out of small stream branches, there is also large stream branches entering into Dak SNghe River is Dak A

Koi large stream branch about 33.7 km from dam site 1A, and Dak Po Ne is about 38.3km from the dam site. For water supply demand, the riverside as well as neighboringarea has no residential area arranged, there is no industrial parks and clusters, water using

demand in dam basin area is almost for welfare of people and agricultural sector. For instance, communes in Upper Kon Tum dam basin area there is Dak SNghe River goesthrough Dak Koi, Dak To Lung, Tan Lap, Dak Ruong and Dak To Re communes and

Dak Rve town, Kon Ray district, Kon Tum province. Dak Koi commune (with 10hamlets), Dak To Lung commune (with 7 hamlets). Population and farming land isconcentrated in Dak A Koi stream side and absolute use Dak A Koi stream water. Dak

Pne commune (with 4 hamlets) and Dak Rve town, population and farming land alsoused water on Dak Po Ne stream branch. Dak Ruong commune (14 hamlets) and Dak ToRe (12 hamlets), its population and farming land located on Dak SNghe River side.However, this river section has abundent source of water because it was added with

source of water from Dak A Koi and Dak Po Ne river branches. In addition to, on main

current of Dak SNghe River (25.2 km from Upper Kon Tum dam towards downstream),there is only on Dak SNghe weir taking water from main current to water about 150 ha

farm land of of hamlet 3 - Tan Lap commune. Therefore, real water using deman behindUpper Kon Tum dam is mostly of Tan Lap commune. According to water demandresults for welfare of the people and agriculture (cultivated crops and breeding) until2020 is 6.27 millions m3 equivalent to 0.693 m3/s .

Table 30: Water supply demand for Upper Kon Tum dam lowlands until 2020.

Irrigation area (ha)

No Water supply work Previous

planRealities

Expected

(2011 – 2020)

I IRRIGATION SUPPLY 287 530 730

1 Dak SNghe dam 87 150 150

2 Small irrigation works for Tan Lapcommune

200 380 580

Water requirements (million m3)

1 Irrigation supply 2.77 4.57 6.04

Water supply (million m3)II HOUSEHOLD + BREEDING WATER

SUPPLY Previous Realities Expected






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plan (2011 – 2020)

1Supply population in basin area from

behind Upper Kon Tum dam to combinedDak Po Ne branch

0.082 0.162 0.23

III TOTAL WATER SUPPLY 2.85 4.73 6.27Thus, according to rate of flow at middle area after dam closure is about 1.52m3/s ,

water supply for this area is still guaranteed.

Ÿ Changing current regime of Dak Lo stream:

For current of Dak Lo stream, operation process of the plant (for purpose of

power generation) changes current regime, but current changing amplitude is small andcontinuous fluctuation during the year. In one day, current capacity is smaller thannormal from 06:00 AM to 18:00 PM and larger than normal from 18:00 PM to 06:00

AM in the next day, as the plant exhausts water for power generation.

Ÿ Impacts on ability to supply water in Tra Khuc River basin:

According to previous investigation and assessment results, Tra Khuc River basin

has crowded population and potentiality in agriculture, so water using demand is rather high. At present, however, lack of water happens usually especially in dry season, buthere which is ended about 3 months longer than Se San River basin. Therefore, theUpper Kon Tum hydropower plant with reservoir capacity is approximiately 145.52

millions m3, after water discharge running through the plant for power generation shalltransfer about 29.96m3/s water into Dak Lo stream and then running to Tra Khuc River.Although this capacity is reduced than before (30.5m3/s) but not remarkable and

irrigation water is still supplied fully helping to increase cultivated crop productivity.The benefited area from the source of water behind the Upper Kon Tum hydropower

plant in dry season is not only Tra Khuc River basin but also Tra Bong River downstream area, Ve River (within Thanh Nam system irrigation area) within Quang

Ngai province.

v Deposition, erosion and reservoir losing ability:

- Reservoir deposition: River prevention banking, creating reservoir and storing water in reservoir sudden changes flow rate and apperance of a static waters created sludge and

alluvial accumulation and deposition phenomenon in reservoir. Reservoir foundationdeposition process shall change deeply hydrographic - hydraulic regime of current.Although reservoir capacity is reduced to about 28.18 millions m3 but ability to depositstill happens.

To calculate sludge deposition volume to dam site 1A, use sludge measurement

document in Kon Plong Station (1994 - 2005). Calculate during a long period in proportion with annual current to obtain sludge volume to Kon Plong station route






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during (1960 - 2005) and apply calculation formula for moving sludge to dam site 1A,with density of suspended sludge about 1.182 ton/m3 and removed sludge is 1.554tons/m3. Total sludge result to dam site 1A is shown in below table:

Table 31: Total annual sludge quantity to dam site 1 (previous plan) and dam site

1A (adjusted plan)

Wll Wdđ W Wll Wdđ WDam site Q (m

3/s) Qs (kg/s)

103

ton/year 103

m3/year

1 15.2 1.525 48.1 19.2 67.3 40.7 12.4 53.1

1A 16.2 1.635 51.6 20.6 72.2 43.6 13.3 56.9

Note: Q: Water discharge calculated to dam site, Qs: sludge quantity calculated to dam site,Wdđ: removed sludge quantity, Wll: suspended sludge quantity, W: Total sludge quantity.

Total deposited sludge quantity in reservoir is calculated upon Brune method is

relying on relationship between retained alluvium with retention period of current inreservoir. At that time, reservoir accmulating capacity after years of operation is shownin below table:

Table 32: Reservoir accumlating capacity after years of operation

Accumulating capacity(106m3)Remained capacity

(106m

3) Accumulated capacitypercentageOperation

period

(year) Previous

plan

Adjusted

plan

Previous

plan

Adjusted

plan

Previous

planAdjusted plan

1 0.05 0.05 173.65 145.47 0.03 0.1

10 0.52 0.52 173.18 145 0.30 1.3

20 1.03 1.03 172.67 144.49 0.59 2.5

30 1.53 1.53 172.17 143.99 0.88 3.7

40 2.04 2.04 171.66 143.48 1.17 4.9

50 2.54 2.54 171.16 142.98 1.46 6.1

60 3.04 3.04 170.66 142.48 1.75 7.3

70 3.54 3.54 170.16 141.98 2.04 8.5

80 4.03 4.03 169.67 141.49 2.32 9.7

90 4.53 4.35 169.17 141.17 2.61 10.5

100 5.02 5.02 168.68 140.5 2.89 12.1

Thus, deposition capacity after 100 years of operation may make up 12.1% deadcapacity of reservoir (41.46 millions m3), therefore, about in the next 826.45 years






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shall fill up entire dead capacity of reservoir. After dam site 1A, annual sludge quantitywould be reduced only approximately 0.069 millions m3/year is remained. However,towards downstream is small stream branches and 02 large stream branches are Dak AKoi and Dak Po Ne combining with Dak SNghe River, hence, shall add a remarkable

sludge quantity into Dak SNghe River.- Reservoir bank erosion and regeneration: Reservoir area is narrowed than before and

still within stratum system is of Kainozoi era. Granite biotite is of Hai Van complex

allocated to cover the reservoir bank, although strong development of erosion phenomon but in local state in small scale inside eluvialsoil layer and powerful weathered belt, hardlyaffecting reservoir capacity. Also according to Kositabslis method about evaluation of reservoir bank regeneration, presents that indicators are operating from weak to medium

level, with value a = 0,.4. At the same time, Dak SNghe River bank area is almost

including cracked weathered granite. However, cracks are filled up with clay. Therefore,ability to erode reservoir bank is low. Nevertheless, it's necessary to take some measures insome sections to prevent strong erosion may happen.

- Evaluate ability to loss reservoir water: Although reservoir capacity is narrowedthan before but reservoir are is still within granite, biotite and basalt allocation area

next to dam site, and a part in upstream area higher than retention level. Moreover,hydrolysis area between Dak SNghe River and Dak Lo River at the altitude up to1.500m, about 340m higher than retention level. At the streams on both sides of water

separation ways at the altitude about 1.200m is 40m higher than retention level. Inaddition to, in this area has large rainfall usually lasted in 9 months in every year,rather abundant underground water quality. Therefore, with retention level is 1.160m,ability to loss reservoir water to Dak Lo stream valley is not existed.

However, ability to penetrate water from reservoir back to downstream happenson both abutments (dam site 1A) due to geological structure, specifically:

+ Left bank abutment: At the section meeting with tectonic fault IV-13 with slope 800

running from upstream back to downstream cutting over abutment at the altitude about1.195m, angle of slope towards the east. The broken up rock is 400m in width runningfrom dam, angle of slope towards the river direction, along with fault rock is

discontinuous broken up is 10 - 20m in width. Two faults locate over abutment lessaffecting dam stability but easy to cause water penetration and loss down to downstream.

+ Right bank abutment: In the section meeting tectonic fault IV-1 with slope 800,running from upstream to downstream cutting over abutment at the altitude of 1.190m,angle of slope towards east, rock is cracked and broken up is from 5 - 10mdiscontinuous width. Fault locates over abutment, little affecting dam stability but easy

to cause water penetration and loss down to downstream.






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v Impact on ecosystem and aquatic product catching and rearing industry:

- For flora: Period of storing water in reservoir with previous plan shall flood859.96 ha, in which farming land has 89.73ha in area, forest land is about 384.8 ha inarea and others are about 385.43 ha in area. However, upon adjusted plan as free

surface area is reduced to 708.1 ha, entire reservoir capacity is 145.52 millions m3 inarea and retention level is 1.160m. According investigation result in 2009, total floodedland is 708.1 ha in area (acquisition land area of resservoir), in which, forest land is

284.41 ha in area. Thus, shall reduce chopping down impacts on forest plants andinherent flora volume here than before. At the same time, it shall limit ability to reducecoverage of forest. Forming reservoir shall also increase humidity, create goodconditions for natural devalopment of cultivated crops and natural trees. On the other

hand, change of main specifications (MNDBT/MNC = 1.160/1.138 and mounting

capacity 220MW) shall minimize influences on population and land, only Dak Tangcommune is left to undertake resettlement. However, this shall occur demands for residential area, cultivated fields for agricultural production. It's expected to allocateabout 4.1 ha of land residential area and 29.55 ha of perennial cultivated land for

people in flooded area for forming the new resettlement villages and hamlets. These

activities shall cause deforestation, removal of fauna here to build up new villages andhamlets, simultaneously, increase risk of illegal exploitation of woods for constructionand firewoods etc. These are reasons for reduction of species, element of species for

inherent fauna in the region.- For fauna: Forming reservoir shall flood some more land areas, change the

environment and separate residence of some animal species used to adapt withterrestrial life. From that point, may cause reduction of species element and narrow

allocation area of many species in the region. However, reduction of elevation to 10mand reservoir capacity to more than 28 millions m3, shall lighten level of impact onsome animal species in project area than before. Moreover, as reservoir is stored fullwater with narrowed free surface area than before, but a cool atmosphere is created to

maintain and develop animal species living at the bottom, species adapting with thewater environment and reservoir side area: birds in kingfisher group and reptile,

amphibian species (water snake, amphibians and iguana etc). Besides, reallocation of some residential areas in region, agricultural development shall develop some speciesand expand distribution of some species as: rats, sparrow and toad etc

- For aquatic system: After forming reservoir although reduced in free surface areaals well as capacity of entire reservoir foundation but has some remarkable impacts onaquatic system in reservoir. This not only changes terrestrial ecosystem but also

hydrology of flooded area and forms the new reservoir ecosystem with characteristicaquatic creatures for this hydrology. During the first years of flooding, in reservoir shall






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appear and fair strong develop group of floating creatures (seawee speices) arecharacteristic aquatic system during this period. At the coastal areas, shrimp specieswould also develop with large quantity of species, meanwhile, mollusca speciesremarkable reduced in quantity because of unstable probability of earth at more flooded

areas. Quantity of some fishes adapting with river hydrology also reduced, however, because of decomposition of biomass, therefore, humus residue eating fishes adaptingwith static water environment shall develop, may increase some planktons at the bottom

adapating with living environment in this hydrology. This is also suitable condition for developing reservoir fish breeding.

- For aquatic catching and rearing industry: With reservoir capacity is 145.52millions m3 and free surface area is 7.081 km2, although reduced but not having impact

during the first years of storing water because static water environment is convenient for

developing fishes as carp, dried mudfish and major carp etc, may forecast fair large fish productivity because abundant source of food. The nutrient supply of the reservoir ismostly coming from two major directions are main current because of erosion andremoval of substances into reservoir from inside due to mineralized decomposition fromthe bottom deposits. Besides, concentration of people, agricultural development in basin

shall also contribute to add nutrients into reservoir, with a view to maintain developmentof aquatic catching and rearing within reservoir foundation area.

v Impact on land environment:

- For land fund in reservoir foundation area: Change of specifications of the projectshall reduce total flooded land area about 155.23 ha in reservoir foundation, and shall

return it back to the local land fund to use for other purposes.

- For land in downstream behind the hydropower plant: Storing water in reservoir andwater discharge behind hydropower plant to the Tra Khuc River basin shall contribute tolimit drough in dry season. Therefore, land use effect in basin area is increased helping tomaintain land quality.

- Changing land structure: Although specifications of reservoir area and capacityare reduced but when storing water in reservoir, land structure of flooded area andreservoir side area would be changed. For instance, the absolute changed flooded landarea is solid deposit in reservoir bottom and mud in reservoir bottom having tendencyto remove to the bottom area in major dam direction. And most of which is usually

swept away with water at times of flood discharge, helping to increase alluvial soil indownstream. Swamping or viscid phenomena increase along the reservoir because of

broken land structure, connection is weak gradually helping to increase ability to

deposit in reservoir foundation in the long term.






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- Forming semi-flooded zone: It's formed in the scale of retention level and deadwater level. There is some area with non-flooded period (3 - 6 months), its area is

corresponding with depth from retention level to 2m depth. Another area with shortnon-flooded period has area corresponding with depth from 6m to the dead water level.

Nevertheless, due to characteristics of natural terrain, reservoir foundation is narrowand long, almost coverred by sides with large slope, that's why semi-flooded zone areaof reservoir foundation is small.

v Impact on economy - society:

Although with the plan to reduce mounting capacity from 250 MW to 220 MW,

however, the Upper Kon Tum hydropower plant shall contribute to supply power to theCentral and South through national grid syste, in cooperation with step hydropower systems on the basin of Se San River. Simultaneously, construction of hydropower

plant shall open some more routes out of entrances or exits from the work, creatinggood conditions to travel and goods commercial betweel local people with areas insideKon Tum province and neighboring provinces. This is also a favorable condition to

develop some local industries as: power industry and building materials manufacturingindustry. Construction of the Upper Kon Tum hydropower plant does not affect theneighboring reservation zones but only affect to local forest area. Besides, reduction of reservoir foundation area and capacity as well as retention level of resevoir shall also

lighten negative impacts on ecosystem in region, may promote tourist potentiality

along with Dak SNghe River area. Forming reservoir foundation is a suitableenvironment for aquatic rearing. The project manager needs to take measures for local

people to rear fishes on semi-flooded area, or plant and cultivate some proper cultivated crops properly with this land.

In general, above favorable conditions shall create the same condition for infrastructure, economy and society of locality, little by little improve living standards of local people.

Beside aforesaid positive aspects, some negative impacts may be mentioned:

- Labor force of the project and emigrants quantity coming to search for business

opportunities shall affect to local economic - social situatuon; increase populationdensity, reclaim land, deforest for making fields in the mountains creating difficultiesto control security order and occur social evils.

- As gathering crowded population and freedom emigrants may bring epidemicswith them to infect local people and on the contrary. The most commonly is digestivediseases, malaria and yellow fever etc.

- In addition to, if measures to manage, monitor and prevent problems and pollution are not performed seriously, shall lead the risk of degeneration quality of land,






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underground water, surface water and biological resources etc. And from that point,shall damage economy and life of people.

6.1.2.3.Change in risks, environmental problems:

v Industrial accidents:

- Because of fire, explosion problems from machines, equipments while running.

- Electric shock, short-circuit due to careless or leakage problem

This problem if happens shall affect lives of operating workers and propertydamages.

v Fire, explosion problems:

During this period, may happen fire, explosion problems in turbine oil and

transformer oil tanks. It's because careless of operating workers or damagedequipments, machines.

v Flood discharge through spillway problem:

This problem happens due to stuck in valve gate or oblige to discharge flood toavoid breaking up dam from too strong overtopping flood. Once it happens shall be aremarkable flood especially for basin of dam site.

v Dam breaking up problem: Dam may be broken up due to following causes:

- Wrong design or exceeding design level

- Flood water is too strong for spillway to discharge, large water pressure may

break up work structure of dam

- Too much horizontal water penetration shall collapse dam face, destroy water conduits passing dam.

- As reservoir is broken shall collapse stream bank, cause local flooding in basin of dam siteaffecting to human lives and health, damaging traffic routes, collapsing bridge foundation and

having influences on welfare works in region with serious damages in economy.v Problem on electrical transmission line:

- Breach of regulations on safety corridor

- Conductor or earth line is degraded after a period of operation.

- Load exceeding limitation of conductor.

- Disaster(Light struct, storm wind) collapses pile foundation, especially weak soil positions

and next to the river






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Its consequences are electric shock, fire, explosion, broken line, broken up pile andinterrupting power supply, impeding traffic. Impacts of this problem only limit withindirect causes. For fire, explosion problem on conduct, if unable to distinguish timely maycause risk of spreading fire, particularly at places where conductor goes through.

v Problem due to light struck:

During operation of the plant, transformer station and power transmission line, problem due to light struck may happen serious affecting human and work.

6.2. Measures to minimize negative impacts of project


v Compensation for damages and resettlement:

According to assessment of degree of damage as mentioned above, the Companyshall undertake compensation and resettlement as followings:

- Estimation of costs of compensation - land clearance, resettlement and infrastructuralsupport of the Upper Kon Tum hydropower project, based upon below legal documents:

Ÿ Documents of the Central government, Ministries and industries:

+ Land Law dated 26th November 2003;

+ Construction Law in 2003;

+ Decree No. 181/2004/NĐ-CP dated 29th October 2004 of the Government onexecution of Land Law in 2003;

+ Decree No. 188/2004/NĐ-CP dated 16th November 2004 of the Government onmeasures to specify land price and price frame of land types;

+ Decree No. 197/2004/NĐ-CP dated 03rd December 2004 of the Government oncompensation, support and resettlement upon land revocation of the State to use for national

defence, security, national interest, public interest and economic development purposes;

+

Decree No. 84/2007/NĐ-CP dated 25th May 2007 of the Government supplementingthe Decree No.197/2004/NĐ-CP dated 03rd December 2004 of the Government;

+ Decree No. 99/2007/NĐ-CP dated 13th June 2007 of the Government on managinginvestment project for construction of work;

+ Circular No. 114/2004/TT-BTC dated 26th November 2004 of the Ministry of Finance on guiding to perform the Decree No. 188/2004/NĐ-CP dated 16th November 2004 of the Government on measures to specify land price and price frame of land types;

+ Circular No. 116/2004/TT-BTC dated 07th December 2004 of Ministry of Financeon guilding to perform the Decree No. 197/2004/NĐ-CP dated 03rd December 2004 of theGovernment.






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+ Hamlet 3 there is 52 flooded households. It's expected to arrange resettlement inthe left of Dak SNghe River nearby administrative center of Dak Tang commune, is2km from the center of Dak Tang commune.

+ In addition to, there are some backup areas to evaluate and choose in detail planning step.

- Scale of resettement works:

Ÿ Land area for resettlement and settled agriculture:

+ Arrange residential area at least 1.000m2 and more for each household, arrangehousing along with transportation route of resettlement area. In addition to, should takeinto account of provision for construction of public works and separation of householdfor forming garden later (forecast until 2020).

+ Fields land: Base upon empty land fund and treeless mountains and hills to

arrange reasonably, but must be at least 1h for every household.

+ Rice production land: Arrange at least 0.8 ha and more for every household.

Hydraulic system of all rice fields supply water upon gravity water supply plan.

Ÿ Household housing: Construction scale:

+ Housing and household work ground area: grading from140 – 150 m2/household, supporting plantation around the household land campus. Arrange housing on both sides of the road.

+ Improved house on stilts : Pile, beam and bracing are made of reinforced concrete

M200, wood floor group 4, hollow brick built wall is 15 cm in length, tile roof andwooden door group 4.

+ Building area: For the household with person quantity < 5, house building area for

each household is 45m2. For the household with person quantity ≥ 5, house constructionare for every household is 60 m2.

Ÿ Infrastructural work:

+ Traffic work:

ü Provincial road 676, flood prevention road is from Km20 and inward: TheCompany shall undertake construction more assured scale than previous road and

support construction of pavement.

ü Construct river bridge connecting to entrance route into existing Mang But routeto guarantee smooth traffic.

ü The routes from provincial road 676 to major routes of the resettlement areas: being built according to grade IV standard for moutainous region, foundation is 6.5m

in width, pavement is 3.5m in width, pavement structure is cement concrete M300.ü The routes inside resettlement areas: Being built according to ANT road type standard.






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Ÿ Electrical works:

+ For the flooded areas, the Company shall compensate by re-construction of other

routes to guarantee normal operation of electrical network 22kV to supply Dak Tangand Mang But communes with power.

+ Construct low pressure electrical network 0.4 kV to every household withinresettlement areas.

+ Construct for each resettlement village 01 transformer station 22/0.4 withcapacity 100 kVA.

Ÿ Training and cultural works:

+ Nursery school, kindergarte: Construct in every resettlement village 01 nursery

school, kindergarten is 100m2 in area. According to a building of 01 storey: rough

stone foundation, hollow brick wall is 15cm in depth, tile roof, wooden door group 4and tile floor 30x30 cm.

+ Cultural house (Communal house): Funding 100% expenses for people to build by themselvels , at least 100m2/communal house.

+ Primary school: Construct 02 classrooms cover an area of 50m2/classroom,housing and working office cover an area of 50m2/ room, in every resettlement village.

According to scale of building with 01 storey: stone foundation, hollow brick wall is

15cm, tiled roof, wooden door group 4 and tiled floor 30x30 cm.Ÿ Household water:

+ Household water supply plan is well boring in association with water tank.

+ Construct common used 01 well and 01 water tank with capacity of 1m3 to servehousehold water demand for 02 households.

Ÿ Irrigation structure: Construct small reservoir works and hydraulic system on Dak Tang and Dak Koi stream branches to make sure irrigation water for 66 ha of wet rice field.

- Supporting resettled people:

Support the resettled people to stabilize their life, living and production activities,

including: Providing enough food for 02 years; funding cost of moving to the newliving place; supporting encouragement of agricultural expansion: variety and sapling;

supporting transformation of profession for people; support in policy and health;education; celebration of new houses; training basic officials, commending andrewarding the migrants on schedule.

- Cost of compensation for land clearance and resettlement:






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For aforesaid compensation and resettlement plans, these costs are VND

119.493.688.757 with following items:

Table 33: Estimated costs of compensation, land clearance and infrastructural

support for the Upper Kon Tum hydropower plant

No Content Unit Quantity Amount (VND)

ICompensation in reservour foundation area and

ground plan11,466,923,030

1 Other structures (except compensation with house) household 82 2,460,000,000

2 Fram produce and perennial tree household 82 2.460,000,000

3 Removal of grave grave 504 655,758,030

3.1 Earth grave existing under 3 years grave 101 170,324,380

3.2 Earth grave existing above 3 years grave 403 485,433,650

4 Compensation for different kinds of land 5.891,165,000

4.1 Compensation for forest land ha 284.41 4,692,765,000

- Rich forest ha 85.323 1,791,783,000

- Average forest ha 113.764 2,047,752,000

- Poor forest ha 85.323 853,230,000

4.2 Compensation for residential area ha 4.100 16,400,000

4.3 Compensation for perennial cultivated land ha 29.550 1,182,000,000

IIInvestment in construction of resettlementarea

81,097,915,000

1 Construction of housing 7,603,719,700

1.1 Grading ha 16 320,000,000

1.2 Construction of housing (55m3/household inaverage) m2 4.510 6,081,599,700

1.3 Subordinate work (20m3/household in

average)m2 1.640 1,202,120,000

2 Public works 2,544,195,000

2.1 Nursery school, kindergarten (03 classes) m2 300 751,290,000

2.2 Elemenary class (06 classes) m2 300 751,290,000

2.3 Cultural place (Communal house) house 3 600,000,000

2.4 Subordinate work for above works m2 90 65,970,000

2.5 Housing of teachers (03 rooms) m2 90 225,387,000

2.6 Working building of teachers (03 rooms) m2

60 150,258,0003 Invest in the infrastructural works 68,070,000,000






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3.1 Invest in construction of traffic works

- Resettlement area and main center lineconnecting track

km 10 30,000,000,000

- Internal road of resettlement areas (ANT) km 6 12,000,000,000

- Road to production area km 6 9,000,000,000

3.2 Power supply

- Power line construction 22 kV km 12 3,600,000,000

- Transformer station 22/0.4 with the capacityof 100 kVA station 3 660,000,000

- Power line 0.4 kv construction km 12 2,400,000,000

3.3 Household water supply household 82 410,000,000

3.4 Hydraulic system for irrigation HT 2 10,000,000,0004 Invest in reclaiming production land 2,880,000,000

4.1 Construction of fields in the mountains ha 90 720,000,000

4.2 Construction of fields ha 72 2,160,000,000

III Supporting resettlement 3,801,040,000

1 Life support (rice) (379x15kgx24 months) ton 136.44 818,640,000

2 Moving support household 82 246,000,000

3 Encouraging agricultural expansion support household 82 410,000,0004 Professional transforming support household 82 1,640,000,000

5 Policy support household 20 20,000,000

6 Recommendation and reward for movementon schedule

household 82 410,000,000

7 Land document adjustment household 82 24,600,000

8 Other supports

8.1 Medical support household 82 36,900,000

8.2 Education support Pupil 100 15,000,000

8.3 Power using support Mouth 379 37,900,000

8.4 New house celebration support household 82 82,000,000

8.5 Basic official training support People 20 60,000,000

Direct cost VND 96,365,878,030

Design survey cost % 7 6,745,611,462

Managing, operating and organizing

performance% 2 1,927,317,561

Backup % 15 14,454,881,705






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TO TAL COSTS VND 119,493,688,757

6.2.2. Period of storing water in reservoir and operating hydropower plant:

For the Upper Kon Tum hydropower project (upon new adjusted plan) entering into

period of storing water in reservoir and operating, promoting entire generating capacity aswell as guaranteeing environmental quality in project area, lowlands and neighboringareas, simultanenously preventing, reducing risks may happen, undertake below measures:

6.2.2.1. Minimize impacts on surrounding environmental quality:

v Measures to minimize noise:

According to above evaluation, source of noise occurs from generator and turbineinstalled place. To reduce noise level from these equipments, below measures tominimize are performed:

- Frequent maintain machines, lubricate joints, moving parts of machines,equipments to reduce noise, guarantee working capacity of machines and workers'health, at the same time, prevent abrasion due to friction; operating control room is

separated from machine hall.

- Increase weight of foundation and fluctuating noise reducer. Sensible

arrangement of noisy machines, equipments in region shall reduce noise resonance.

- Workers working at the noisy places shall be equipped personalnoise reducing device.

v Measures to minimize for household wastewater:

According to estimation of sewage flow rate needs treatment is 4m2/day. This istreated with three-compartment digestion tank: 01 containing compartment and 02depositing compartments. This tank has ability to treat all kinds of wastewater or dung and

urine with two processes are deposition and slurry fermentation. After leaving digestiontank, wastewater would be exhausted to common sewer in region through pipeline.

Digestion tank capacity is specified upon below formula:

W = Wn + Wc (m3)

In which:

+ Wn: Water volume of the tank (m3).

+ Wc: Slurry volume of the tank (m3).

Number Wn is equal to 1-3 times of wastewater quantity in day and night. Toguarantee sanitary conditions and reduce costs, we choose Wn = 2 × 4 = 8 m3.

Value Wc is specified upon below formula: (m

3

)






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COD is 77% and TSS is 86.2%. Therefore, after treatment with baffled septic tank,household water may exhaust into source of receiving.

v Measures to minimize for household waste:

- Solid waste: During this period, almost is household waste occurs at the working

area plant operating personnel, including nylon bags, redundant pieces of food andsome others as plastic, paper, rubber, broken glasses etc. Waste is classified accordingto source of indecomposable and composable waste to collect and treat separately inaccordance with the Decree No. 59/2007/NĐ-CP dated 09th April 2007 of the

Government on managing solid waste.

At every working area of the plant shall arrange dust bins are collected and

sanitary buried at the landfill at project area in every day. Area scale of sanitary landfill

is 2.920 m

2

/year and calculated within the next 16 years (until the year of 2030) would be 46.720 m2 ~ 4.7 ha.

- Harmful waste:

+ Guarantee that personnel and operating equipments, engines transport vehiclesmeeting all standards.

+ Service and maintenance are performed periodically and use waste greasecollection devices to limit leakage at the plant area.

+

Collect, sort out and separate with other solid waste according to Circular No.12/2011/TT-BTNMT (for sorted waste grease with code is A3020 or Y8, for waste

heat transmission oil and insulating oil containing sorted PCB with code is A3180or Y 10).

+ Register owner of source of waste with the environmental managing agency.

+ Store at the private harmful waste storage in the plant and hire the harmful waste

treatment company in accordance with the Circular No. 12/2011/TT-BTNMT dated14th April 2011 of the Ministry of Natural Resources and Environment on managing

harmful wastes.6.2.2.2. Minimize impacts on reservoir water quality and lowlands:

- To reduce organic pollution of reservoir water before storing water in reservoir, theCompany would collect reservoir foundation conforming to process and meet standards

before impounding the current.

- Disarm bombs, mines, chemical poison and explosive materials.

- Clean up forest and flora at reservoir foundation before storing water:

+ Use sawing machine to saw large logs of wood.






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+ Hire local people to clear reservoir foundation

+ Gather all large logs of wood according to regulation, may allow local people to

gather small trees to use as combustible source.

-

Hire qualified company to monitor performance process, guanrantee efficiency of cleaning up.

- Establish reservoir foundation management Subcommittee: Consult local people about

organizing personal taking part into aquatic development and rearing within reservoir foundation, with a view to guarantee natural resources, protect the ecological environment.

- Frequent dredge, clean up reservoir foundation, absorb mud next to waste outletwith waste fishing instrument and dreger. Frequent dredge waste outlets and bottomdischarge valves.

- Dredging device: Use specialized boat, net to fish floating waste from reservoir surface as rotten branches, dead bodies of creature etc.

- Dredging period is periodic performed on quarterly basis, especially after days of flooding.

- Household waste of personnel is absolute collected, it is strict prohibited to

dispose or drop to the reservoir foundation.

- Develop natural fish breeding, native creatures, combined agricultural - forestry -aquatic product models with a view to absolute develop contents of organics in

reservoir foundation for economic effects.

- Land use in reservoir area for construction of project infrastructures causingconsequence is more and more limited coverage of floristic composition. Therefore,

should supply instructions of cultivating suitable kinds of tree, afforest and protectforest. In addition to, the local government should encourage people to diversify proper cultivated crop types, disseminate about limited use of chemical fertilizer to prevent

eutrophisation on cultivated area nearby reservoir area.

- Strengthen educating workers on serious compliance with regulations onreplacing, disposal of lubricant, absolute prohibit workers to spill lubricant over surrounding area, especially rivers and streams.

- Undertake periodic observation of water quality and monitor reservoir water quality happening to take proper measures to treat in case of any negative change.

6.2.2.3. Minimize impacts due to current change:

- Set up zoning map according to degree of deposition, evaluate ability to deposit

during every period for planning to manage operation sensibly and safely.






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- Serious comply with operation process of reservoir, maintain minimum flowvolume of the reservoir section behind dam site 1A. Calculated rate of flow in flood

season and dry season below:

+ Calculated rate of flow of peak of flood during flood season:

Table 34: Design peak of flood of Upper Kon Tum dam site 1A

Qmaxp% (m3/s)

Route0.1% 0.5% 1% 3% 5% 10%

Dam site 1A (adjusted plan) 2.650 1.931 1.672 1.294 1.132 935

+ Calculated rate of flow during dry season:

Table 35: Rate of peak of flood during months in dry season at dam site 1A

Qmaxkp (m3/s)Month

5% 10% 20%

I 49.6 41.6 33.5

II 24.1 22.1 19.8

III 38.9 31.5 24.3

IV 42.1 34.4 26.7

V 98.7 81 62.4

VI 247 168 100

VII 140 119 94.4

I - VII 271 198 136

- In dry season, base upon water quantity observational figures to every day during

season to obtain sensible operation mode of the hydropower plant.

- Cooperate with the local government in monitoring flow to undertake sensiblesettlement plan.

6.2.2.4. Surface erosion resistance on basin of reservoir, reservoir foundation

sedimentation:

- Arrange clearances to install trash racks, waste handling equipments at the water intakes.

- Arrange sluicing outlets to reduce sedimentation capacity, increase useful capacity.Add sedimented sludge flushing gate at the bottom in design plan. Open waste outlet to

exhaust sedimented sludge quantity in reservoir foundation, make sure 1/10 of which isexhausted. Water discharge regime through spillway and bottom discharge regime, if reasonably, in one hand, shall take intiative to reduce seawee quantity on surface level,

on the other hand, reduce nutrient quantity on bottom level and deposited sludge quantityclose to bottom level.






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6.2.2.7. Minimizing impact on ecological system:

Apart from additional afforestation of preventive forest has an area of 284.41 ha

as compensation for lost forest area in flooded area, planting trees and coveringfloristic compisition along river side against erosion and deposition of reservoir

foundation as well as lowlands as above mentioned, below methods shall be performedto minimize impacts on ecological system, for instance:

- Execute forest protection Law, reservation areas combining with Local forestmanagement in close control to prevent uncontrolled hunting, chopping forest. Complywith legal regulations on minimizing impacts on ecological system:

+ Forest development and protection Law No. 29/2004/QH11 was adopted by the11th National Assembly of the Socialist Republic of Vietnam at 6th session on 03rd

December 2004 and valid since 01st April 2005.+ Bio diversifiction Law No. 20/2008/QH12 was adopted by the 12th National

Assembly on 13th November 2008 at the 4th Session.

+ Decree No. 23/2006/NĐ-CP dated 03rd March 2006 of the Government onexecution of Law on Protection and development of forest.

+ Decree No. 32/2006/NĐ-CP dated 30th March 2006 of the Government onmanaging forest plants, rare forest animals are on the edge of extinction.

+

Decree No. 65/2010/NĐ-CP dated 11th June 2011 of the Government on detairegulation and guiding execution of some clauses of Bio diversification Law.

+ Decision No.186/2006/QĐ-TTg dated 14th August 2006 of the Prime Minister onissuance of forest management Regulations.

- Set up training and education program to enhance awareness of environmental protection, propaganda and strict management methods to prevent deforestation

- Establish restricted areas, the area has no breach of forest by issuing regulationsand setting up panels, posters are visible to everybody.

- Well implement measures as cleaning up reservoir foundation and managingsource of waste in reservoir foundation

- Manage aquaculture process in reservoir foundation in aspects of rearing, catchingmethods to make sure it's suitable with source of water and hydrographic mode.

- Control wastes dispersing into the environment, take measures to sensible managewastes may be hamful to the land, water environment and terrestrial biological systemas well as aquatic creaties.

6.2.2.8. Minimize impacts on economy - society:






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- Satisfactory compensate for land and assets on land of people living in reservoir areaand on ground plan. Return people temporary used land area to reuse as soon as possible.

- Put forward strict regulations and statutes to punish officials and workers in the plantdue to causing disorder, gambling etc, educate them about healthy lifestile, harmonious

with local people, respecting local culture, manners and customs and lifestyle.

- Put forward regulations, statutes on going in or out of the plant, establish the power line and electric pole protection team with a view to prevent stealing plant properties.

- Strengthen cleaning up the environment within the epidemic risks controlling arae(as mosquito, malaria etc) by improving medical system for caring health of the Plant

personnel. The issues that priority must be given to care about health of local peopleand labor force of the project are:

+ Eliminate all insects and mosquitos before 12 months.

+ Reserve medicines and quinine

+ Spray mosquito killer in the house and breeding farms and houses, pools once

every year, inspect using mosquito killer inside mosquito-net

- Minimize freedom migrants from the infected areas, areas where power transmission line goes through, sensititve area in environment because of developing

hydropower.

- Planning areas upon development orientation of locality, avoid excessive usingresources, and stay away from conflicts due to using water and land resources.

- Guarantee safety methods as running reservoir, serious comply with presentregulations on flood discharge, necessary to inform people timely to limit at maximumall human and property damages.

6.3. Minimizing environmental problems

6.3.1. Minimizing risk due to dam breaking:

+ Serious comply with dam design process in present calculationg standards, set updesgin scheme, base upon major specifications from the process of careful and correctsurveying geology, topography and regional tectonic dynamic earth at the e xpectedarea for construction of dam site and plant area. Detect faults, earthquake phases,

depression and sliding phase for proper design plan.

+ During operation, the first thing must be interested in is dam safety issue. Has to

serious comply with operation regulations and frequent observe the dam, itsmovements and take measures to settle immediately any dam problem, with a view tominimize at maximum risk due to dam breaking problem






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+ Propagandize education, awareness of people in protection dam, serious settlecase of deliberate destruction of work

+ Safety mange dam and reservoir:

+ For scientific and professional in managing and operating the work, should train

specialized team in managing dam safety.

+ Strengthen close inspection in work managment, operation and service. Construct

dam observation system, inspection of dam safety by experts and dam safety reportshould be made periodically in every year

+ Wide propagandize dam safety to the public, attach special importance to trainingand false alarm helping to increase reactivity effective every time any problem happens.

+ Make up daily monitoring document for every category: measure and inspect

level, check flushing gate opening and closing devices etc for timely detecting anysmall change. These documents present technical specifications of initial design , repair and replacement processes, recording daily survey ressults with illustrations.

+ Establish rescue plans in case of emergency with a view to propose full solutions

to prevent human and asset damages may be foreseen in case of dam breaking.

+ Establish storm and flood prevention Board during both processes of project

implementation. In case of flood or receiving flood forecast, the Board must present at

the work to undertake:ü Close monitoring hydrometeorological happenings (reservoir water level,

discharge to reseervoir, rainfall on basin and information of rainstorm forecast).Calculate and propose flood regulation and discharge plans.

ü Inspecting situation of equipments, materials, fuels, devices and human resourcesserve flood discharge through spillway.

ü Mobilizing flood prevention force willing to perform all plans relating to flood prevention.

+ Comply with special reservoir operation process during flood season and in caseof problem, specifically:

ü In flood season: Inspect work before flood in accordance with present regulations,detect and settle timely damages, guarantee safety operation of work during flood season.According to hydrometeorological forecast during annual flood season, set up reservoir regulation and operation process, guarantee safety of work and store enough water for water using demand, report to the concerned Services and Industries. Set up flood and

storm prevention plans for reservoir, submit to the competent authorities for approval.






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ü Overcome problem during operation of reservoir flooding or emptying water inarea behind the dam. As head works of reservoir (main dam, flood discharge and inlet)there is a sign of dangerous problem to the work, shall report to the Department of Industry and Trade, Steering Committee for Flood Prevention, submit to the People's

Committee of Kon Tum province decision on water drainage, lowering reservoir water level to safety level for head works of reservoir, works in downstram, at the same time,

propose settlement plans and measures to implement. However, in anticipation of any

problem, should organize well prevention, usually close monitor and follow happeningof weather conditions, forecast, early warning in case of flood or storm, preparematerials and flood prevention equipments, backup equipments for rescue, checking

before rainy and flood season to take measures repair, reinforce timely, contribute to

minimize human and asset damages in case of flood and storm

6.3.2. Fire, explosion prevention and industrial safety:

v Fire, explosion prevention:

- Work out a plan to prevent fire, explosion; fire, explosion prevention safetyregulations. Educate and train plant offcials and workers on fire, explosion prevention;establish a fire prevention team to be trained frequently and alwayls be on duty.

- To prevent fire, explosion problems, should arrange full fire stations, constructreservoir water tanks, equip hand tool fire extinguisher.

- Within operating room and the plant, need to construct fire alarm system andalarm information system. Frequent inspect fire prevention equipments and always be

ready to use in accordance with fire prevention regulations.

- Industrial safety regulations in repair must be implemented in accordance withsafety regulations during operation.

- Take measures to restrict the activities of people before spillway as: fishing,fishing wood out of river, swimming etc

- Equip full protection equipments for the operatprs.v Electrical safety:

Design, installation must comply with regulations on electrical safety, for instance:

- During operation of the Project, specific regulations and guidance are necessary

to guarantee requirements of electrical safety.

- Frequent inspect electrical protecting equipment system of the whole plant,

replace immediately if it is downgraded, does not meet standards.






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- Workers are having history of cardiovascular and mental diseases working on theheight.

v Lightning protection system:

-

It is necessary to install lightning protection system and lightning collectionsystem for entire plant, comply with technical requirements to minimize lightningdamages, guarantee safety of work in the long term

- Below lightning protection methods would be applied for protection of subjects:

+ The plant and operation manager are proper protected with Lightning conductor system on the roof

+ Use lightning conductor locating on abutments and building structures in transformer

station, taking into account of pulling earth lines from the electrical transmission line into pillar inside station. In addition to, equip lightning arresters of the power transmission lineto protect lightning wave from spreading into station from line.

+ For lightning protection system, light protector must be installed at the highest position of works, from headwork cluster to the hydropower plant. Light conductor should be more than 15m in height, ballistic earth resistance of lightning protection

system must be smaller than 10Ω as electrical resistivity of land < 50.000Ω/cm2 andlarger than 10Ω as it is > 50.000Ω/cm2.

v Safety in management and operation:

- Set up prohibition notices at the dangerous reservoir areas, such as large depth,sliding alwayls happen, warn and strict prohibit people from coming to these areas to

avoid occasional accidents due to contact with reservoir.

- Plan reserved area for people to collect water for household activities in dryseason as source of water is scarce.

- Establish reservoir protection and investigation team to discover and overcome timely

the problems.Because the Upper Kon Tum hydropower plant is located on upper rearches of Se

San River basin, and to guarantee harmony with electrical development benefits amonghydropower plants and irrigation for the basin, shall take initiative to propose and work

with the Project Manager of remaining hydropower plants to put forward an unifiedgeneral operation process for the system, establish the general monitoring andoperating Service for operation process of the hydropower reservoir in system

7. CHANGE IN ENVIRONMENTAL MANAGING AND MONITORING

PROGRAMS OF THE PROJECT

7.1. Change in environmental managing program






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The environmental managing and monitoring program of the Upper Kon Tum

Hydropower is under preparation and construction, shall be implemented uponcooperation between the Project Manager, contractors and local government.

- The environmental managing division of the project managing Service: The project managing Service shall establish an environmental managing division. It is

assigned to collect and settle environmental information from the contractors andregions during construction, monitor all enviromental changes, give the Companyregular and unexpected reports.

- Environmental managing division of the Contractor:

The contractor must assign environmental officials to watch closely

environmental problems, implementation situation of measures to minimize at the siteduring construction (with and without recording in diary) and submit to the projectManaging Service the regular and unexpected written reports.

Because professional requirements and use of specialized equipments to measure,analyze and test, the Company (project managing Board) shall hire the consultancy

units to implement monitoring and unexpected activities (if any).

- Monitor local environment: At least 01 representative of the local government(suffered district and communes) is assigned to manage, monitor environmental change ,

monitor implementation of measures to minimize, propose additional measures tominimize properly with local conditions, with a view to guarantee local environment.The written report must be sent to the Company on monthly basis.

- Environmental monitoring and managing at the site:

At the site, Company's representative is the managing Board and contractors arefrequent communicate with each other, make up report on monitoring implementationof minimizing environmental impacts as well as environmental problems to cooperate

in settlement timely.The local environmental management teams cooperate with each other to manage,

monitor implementation of plan and measures to minimize, propose addition measures

to minimize (if any) with a view to guarantee local environment and send report to theDepartment of Natural Resources and Environment of Kon Tum province.

- Make up periodic report on environmental protection serve for management, inthe frequency of once every 6 months.

7.1.2. Period of storing water in reservoir and operation of hydropower plant:






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Table 37: Water environment monitoring program during preparation and

construction

Water environment monotoring Previous plan Adjusted plan

Surface water:

- Monitoring position: 02 positions:- 01 sample at reservoir foundation;- 01 sample at damiste 1construction site;

04 positions:- 01 sample at Dak SNghe River towards upstream of dam site 1A;- 01 sample at dam site 1Aconstruction site;- 01 sample at reservoir foundation;- 01 sample behind dischargecanal construction site of the plant;

- Sample quantity: 02 samples 04 samples (01 sample at each position)

- Measurement parameters: Temperature, pH, suspendedresidue, turbidity, conductivity,total degree of mineralization,dissolved oxygen, BOD5, COD,

NH4+, NO3

-, NO2-, PO4

3-, Cl-,total iron quantity, totalColoform quantity, insecticide,and some heavy metals.

Temperature, pH, turbidity,conductivity, DO, TSS, BOD5,COD, NH4

+, Pb, NO3-, NO2

-,PO4

3-, Cl- , Fe, Cu, Cr 3+, Cr 6+,mineral grease, Coliform andE.coli.

- Frequency: 04 times/year 04 times/year - Comparative Standards/ Codes: TCVN 5942-1995. QCVN 08:2008/BTNMT.Underground water:

- Monitoring program: 02 positions:- 01sample at the worker'shousing area next to dam site 1construction site;- 01sample at the worker's housingarea next to the hydropower plantconstruction site;

03 positions:- 01sample at the worker'shousing area next to dam site1A construction site;- 01sample at the worker's housingarea next to the hydropower plantconstruction site;- 01 sample at the resettlement area


- Measurement specifications: Temperature, pH, suspendedresidue content, turbidity,conductivity, total degree of mineralization, dissolved oxygen,BOD5, COD, NH4

+, NO3-, NO2

-,PO4

3-, Cl-, total iron quantity,total Coliform, insecticide andsome heavy metas

pH, hardness, TS, COD, NH4+,

SO42-, Pb, NO3

-, NO2-, Cl- , Fe,

Cu, Mn, Cr 6+, Coliform andE.coli.

- Frequency: 04 times/year 04 times/year - Comparative Standards/ Codes: TCVN 5944 – 1995. QCVN 09:2008/BTNMT

Household wastewater:

- Monitoring position: 02 positions:- 01 sample at the workers'housing area next to dam site 1construction site;- 01 sample at the workers'

02 positions:- 01 sample at the workers'housing area next to dam site1A construction site;- 01 sample at the workers'






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Water environment monotoring Previous plan Adjusted plan

house next to hydropower plantconstruction site;

house next to hydropower plantconstruction site;


- Measurement parameters: Temperature, pH, suspendedresidue content, turbidity,conductivity, total degree of mineralization, dissolved oxygen,BOD5, COD, NH4

+, NO3-, NO2

-,PO4

3-, Cl-, total iron quantity,total Coliform, insecticide andsome heavy metas

pH, TSS, BOD5, NH4

+

, PO4

3-

, NO3-, animal and plant grease

Cl- , Coliform.

- Frequency: 04 times/year 04 times/year -Comparative standards/codes: TCVN 6772- 2000 QCVN 14:2008/BTNMT

7.2.1.3.Monitoring ecological environment:

- During construction of work, shall increase risk of encroaching upon animals and plants in neighboring area out of scope of plan and reservoir, it's necessary to monitor ecological environment. Ecological monotoring includes:

+ Monitor restoration of land area after used and plant some forest areas, monitor illegal operations: hunting, forest product exploitation, transportation and wild animaltrading, collecting forest trees etc during construction period. These operations are

implemented by cooperation between the building Contractors and Branch Department

of Forest Management.+ Monitor living aquatic creature environment at construction site, with a view to detect

changes in species element and quantity. It is performed by the aquatic creature experts.

- Monitoring frequency: 06 months/once

7.2.1.4. Monitoring hydrometeorological environment:

- During preparation and construction of project, shall undertake monitoring thehydrographic environment. Change in flow, intensity and frequency of flood, muddy

sand flow and bank erosion. Environmental observation work is complied withaccording to process and code of the hydrometeorological industry is of the Ministry of

Natural Resources and Environment.

- Monitoring frequency: 03 months/ once (during construction and operation period) at the observational position installed areas.

7.2.1.5.Monitoring land erosion:

- Monitoring position is where shall happen surface erosion during construction. At

the headwork for construction of main dam and basin above reservoir.- Monitoring frequency: 06 months/01 once






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7.2.1.6. Monitoring compensation, resettlement work:

- Compensation, land clearance, emigration and resttlement works are complicated andvery important. To organize well this work means reducing economic and social damagesfor people in flooded area and where receiving emigrants, in the most positive manner.

- Organization structure: 01 compensation and resettlement Steering committee of Kon Tum province, Kon Plong district, the Department of Compensation andResettlement of Vinh Son - Song Hinh Hydropower Joint Stock Company.

7.2.2. Period of storing water in reservoir and operation of hydropower plant:

7.2.2.1. Monitoring air environment:

Table 38: Air environment monitoring program during storing water in reservoir

and operation of hydrpower plant

Air environment monitoring Previous plan Adjusted plan

- Monitoring position: 04 positions:

- 01 sample at dam site 1A;

- 01 sample at the hydropower plant;

- 01 sample at the operating building area;

- 01 sample at the resettlementarea.

- Sample quantity: 04 samples (01 sample at each position)

- Measurenment specifications: Suspended dust, CO, NO2, SO2,micro-climate factors(temperature, humidity, windspeed), noise and vibration.

- Frequency: 04 times/year

- Comparative Standard/Code:

There is no monitoring program

QCVN 05:2009/BTNMT,QCVN 26:2010/BTNMT,QCVN 27:2010/BTNMT.

7.2.2.2. Water environment monitoring:

Table 39: Water environment monitoring program during storing water in

reservoir and operation of hydropower plant.

Water environment monotiring Previous plan Adjusted plan

Surface water:






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- 01 at the reservoir foundation;

- 01 at downstream area;

04 positions:

- 01sample at Dak SNghe River towards downstraem of dam site1A;

- 01 sample at dam site 1A;- 01 sample at resevoir foundation;

- 01 sample at behind dischargecanal of the plant;

- Sample quantity: 05 sample/1 position 04 samples (01 sample at each position)

- Measurement specifications: Temperature, pH, suspendedresidue content, turbidity,conductivity, total degree of

mineralization, dissolved oxygen,BOD5, COD, NH4+, NO3

-, NO2-,

PO43-, Cl-,total iron quantity, total

Coliform, insecticide and someheavy metas

Temperature, pH, suspendedresidue content, turbidity,conductivity, DO, TSS, BOD5,

COD, NH4+, Pb, NO3-, NO2-,PO43-, Cl- , Fe, Cu, Cr 3+, Cr 6+,

mineral grease Coliform andE.coli.

- Frequency: twice/year 04 times/year

- Comparative Standards/Code: TCVN 5942-1995. QCVN 08:2008/BTNMT.

Underground water:


- 01sample at the operating building;

-02 samples at the resettlement area

- Sample quantity: 04 samples (01 sample at each position)

- Measurement specifications: pH, hardness, TS, COD, NH4+,

SO42-, Pb, NO3

-, NO2-, Cl- , Fe,

Cu, Mn, Cr 6+, Coliform andE.coli.


- Comparative Standards/Code

There is no monitoring program

QCVN 09:2008/BTNMT

Household wastewater:


-01 sample at the resettlement area;

- 01sample at the hydropower plant operating building;

- Sample quantity:

There is monitoring program

02 samples(01 sample at each position)






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- Measurement specifications: pH, TSS, BOD5, NH4+, PO4

3-, NO3

-, animal and plant greaseCl- , Coliform.


- Comparative Standards/Code QCVN 14:2008/BTNMT

7.2.2.3. Monitoring quality of ecological environment:

- Monitor ecological environment including below activities:

+ Monitor restoration of used land areas after completion of work, afforest preventive forest in reservoir side area and monitor illegal activities: hunting, forest

product exploitation, wild animal transportation and trading, collecting forest trees etc.These monitoring activities are performed annually and performed by cooperation

between the Employer and Branch Department of Forest Management.

+ Monitor aquatic creature environment in reservoir foundation and lowlands areas

(behind the dam and plant) with a view to detect changes in species element and their development after reservoir is available. This is performed by aquatic creature experts.

- Monitoring frequency: 06 months/once for 10 years.

7.2.2.4. Monitoring economic and social environment:

Cooperate with local appropriate agencies in collecting relevant documents abouteconomic and social development as life, income etc within resettlement are and

neighboring areas, present in annual periodic environmental protection report.

7.2.2.5. Monitoring hydrometeorological environment:

Continue using some hydrometeorological stations are under operation. Theobservational categories including: change in flow, intensity and frequency of flood,

muddy sand flow, water quality and bank erosion in lowlands.

(Changed coordinate and position of monitoring positions shall be specific

presented in attached monitoring maps in appendix 4).

8. OTHER CHANGES

Due to changes in some major specifications of the Upper Kon Tum hydropower project, should consult the community in some suffered communes in Dak Koicommune, Kon Ray district, Dak Tang commune, Mang Canh commune and Ngoc

Tem commune in Kon Plong district.






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Based upon relevant documents about project and Offcial dispatch of the Vinh Son -Song Hinh Hydropower Joint Stock Company on opinions of the community aboutadditional environmental impacts assessment report of the Upper Kon Tum project:

- Official dispatch No. 252/2011/CV-VSH-QLDA-KHĐT dated 06th April 2011




People's Committees and Fatherland Front Committees of above communesissued reply documents, for instance:

8.1. Opinion of the commune level People's Committee

8.1.1. People's Committee of Dak Tang commune:

- Agree with contents, forecasts of bad impacts may be caused by the project as

above

- Nevertheless, should add some relevant impacts during construction of work categories, during storing water in reservoir:

+ Forecast more enough impacts on ecosystems (deforestation, forest burning for wood and illegal wild animal hunting and trading activities).

+ Evaluate ability to happen land slide and other problems during rain storm season.

- Agree with measures to minimize bad impacts on environment of project area as proposed.

- Implement compensation and resettlement plans in accordance with law regulationsand work out a plan to remove people in project are to new resettlement area. In particular,

cooperate with local government in protection of forest and forest resources.

- During implementation of project, if any problem and risk happens, it's necessary

to agree and satisfactory compensate for people.

8.1.2. People's Committee of Mang Canh commune:

- Agree with contents, forecasts of bad impacts that project may cause asmentioned.

- However, the project manager needs to add some environmental related impactsafter project is commissoned as below:

+ Impacts due to change in reservoir water quality to ecological system in region.

+ More enough forecast problems may happen during rain storm season.






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- Agree with measures to minimize bad impacts on environment in project area.

- Interest in undertaking solutions in reservoir water quality before putting into

operation and undertake sensible compensation plan for resettlement so as to guarantee people's lives in flooded area.

8.1.3. People's Committee of Ngoc Tem commune:

- Agree with contents, forecasts of bad impacts that project may cause asmentioned.

- Agree with measures to minimize bad impacts on environment in project area proposed by the project manager.

- Guarantee water quality after passing the plant to Dak Lo stream, and thenrunning to Tra Khuc River basin, because this source of water would be used for agricultural irrigation activity of Quang Ngai people. Simultaneously, undertakemeasures to minimize land erosion and sliding in discharge canal plant area.

8.1.4. People's Committee of Dak Koi commune:

- Agree with contents, forecasts of bad impacts that project may cause as

mentioned.

- However, the project manager needs to add some environmental related impactsafter project is commissoned as below:

- Absolute collect and clean up reservoir foundation before storing water in reservoir,

with a view to guarantee quality of souce of water. Simultaneously, implement satisfactorycompensation plans for flooded areas and cooperate with local government in protection of

forest resources.

8.2. Opinion of Fatherland Front Committe

8.2.1. Fatherland Front Committee of Dak Tang commune:

Agree with solutions, methods to minimize bad influences on environment within project area. At the same time, order the project manager to cooperate with the localgovernment in management of officials, workers during project implementation, with a

view to guarantee local social order security situation.

8.2.2. Fatherland Front Committee of Mang Canh commune:

- Agree with assessment content of bad impacts of the project on environment withsolutions and measures to minimize bad impacts on environment during project area.

- Order the project manager to implement full measures to protect the environment,

with a view to minimize to lowest level bad impacts of project, at the same time,






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undertake comprehensive managing reservoir and take measures to develop aquaticrearing industry in reservoir area helping to guarantee people's life.

8.2.3. Fatherland Front Committee of Ngoc Tem commune:

-

Agree with assessment of impacts and solutions, measures to minimize badimpacts on environment within project area.

- Moreover, during hydropower operation process, the project manager has to

comply with sensible operation process to avoid drought situation in Dak SNghe River basin area and flooding in plant lowlands in Dak Lo stream.

8.2.4. Fatherland Front Committee of Dak Loi commune:

- Agree with assessment contents of bad impacts of the project on environment as proposed.

- Agree with solutions, measures to minimize bad impacts on environment within project area. As the project is commissioned, it's necessary to implement seriouslyreservoir operation process with a view to guarantee source of water in Dak SNghe

River basin for some hydropower plants are under operation.

9. CONCLUSIONS

The "Upper Kon Tum Hydropower" Project is under investment in construction bringing many positive impacts to the locality in particular and Western Highlands in

genera. The environmental impacts assessment report of the project has been adoptedupon the Decision No. 1718/QĐ-BTNMT dated 29th August 2008 of the Miniistry of

Natural Resources and Environment. During implementation of Project during last

years, Vinh Son - Song Hinh Hydropower Joint Stock Company always implementedfully contents of environmental protection that mentioned in the Report, hence,environmental protection of the Company always achieved good results. Nevertheless,during implementation, the Company studied and adjusted some contents of project(MNDBT/MNC = 1.160/1.138 and mounting assembly 220MW), with a view to put

forward an optimized plan is effective in economy, soceity, environment and proper with hydropower development planning on Se San River. For this reason, the Companyset up the additional environmental impacts assessment Report for the project,according to law regulations.

The additional environmental impacts assessment Report of the "Upper Kon TumHydropower" Project presented more contents of change against the previousenvironmental impacts assessment Report has been adopted. The Report assessed carefully

changes in negative impacts on elements of environment to supplement measures to

minimize, settle pollution with higher effect in environmental protection in Project area.






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To implement well measures to minimize for the environment, Vinh Son - SongHinh Hydropower Joint Stock Company commits to keep maintaining andstrengthening effective measures to control, minimize pollution are applying by theCompany. Simultaneously, the Company shall implement more measures presented inthe report are:

- Undertaking environmental managing and monitoring programs.

- Applying comparative standards and codes such as: QCVN 05:2009/BTNMT, QCVN06:2009/BTNMT, QCVN 09:2008/BTNMT, QCVN 08:2008/BTNMT, QCVN 14:2008/BTNMT,QCVN 26: 2010/BTNMT, QCVN 27: 2010/BTNMTand TCVN 3985 – 1999.

- Complying with general regulations on relevant environmental protection duringconstruction and commission of the project, including:

+ Implement well measures to minimize and settle environmental pollution as project is

started to implement until it's commissioned avoid impacts on surrounding areas of the project. Simultaneously, should comply with and apply present standards and codes.

+ Strong combine with the Commitee for Flood and Storm Control of the provinceand local government during flood discharge

+ Commit to guarantee flow rate passing the plant conforming to design (29.96m3/s) to make sure maintaining enviromental flow.

+ Guarantee safety working environmental for the operating workers.

+ Cooperate with the construction unit to implement well environmental sanitary

and industrial safety methods, with a view to guarantee safety working environment for construction workers.

+ Close cooperate with the local government and environmental managing agency toimplement well and fully the periodic environmental observation and monitoring programs.

+ If, during implementation, occurring environmental pollution, problem and risk affecting production and people's life around the region, the Company commits tocompensate and overcome consequences of the project.

+

In every year, the Company shall make up detail report on environmentalhappening at project area and plans to overcome environmental problems, risk to the

State agency for orientation, direction and commitment.

Above is entire content of the additional environmental impacts assessment

Report of the "Upper Kon Tum Hydropower" project, the Ministry of NaturalResources and Environment is kindly suggested to consider, complete formalities of appraisal and approval of the additional environmental impacts assessment Report for the Project, create good conditions for convenient operation of the Project.