Environmental Safeguard Monitoring ReportTRT Tail Race Tunnel ... progress has been achieve for...

Environmental Safeguard Monitoring Report

Project No. 44444-013 Quarterly Report June 2019

Bhutan: Second Green Power Development Project (118 MW Nikachhu Hydropower Project)

Prepared by the Tangsibji Hydro Energy Limited for the Asian Development Bank.

This environmental safeguard monitoring report is a document of the borrower. The views expressed herein do not necessarily represent those of ADB's Board of Directors, Management, or staff, and may be preliminary in nature. In preparing any country program or strategy, financing any project, or by making any designation of or reference to a particular territory or geographic area in this document, the Asian Development Bank does not intend to make any judgments as to the legal or other status of any territory or area.

1

Environmental Safeguard Monitoring Report

Reporting period : October 2018 to December 2018

Date : June 24, 2019

118 MW Nikachu Hydro Power Project

Prepared by the Tangsibji Hydro Energy Limited for the Asian Development Bank

This environmental safeguard monitoring report is a document of the borrower and

made publicly available in accordance with ADB’s Public Communications Policy 2011

and the Safeguard Policy Statement 2009. The views expressed herein do not

necessarily represent those of ADB’s Board of Directors, Management, or staff.

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Abbreviations

ADB Asian Development Bank

BHUCORE Bhutan Consultant for Research and Environment

CDM Clean Development Mechanism

DGPC Druk Green Power Corporation

DOFPS Department of Forest and Park Services

EMP Environment Management Plan

ESIA Environment and Social Impact Assessment

GNHC Gross National Happiness Commission

GRM Grievance Redress Mechanism

GEOG Administrative Unit Below District

HRT Head Race Tunnel

JSWNP Jigme Singye Wangchuck National Park

MW Mega Watt

PDD Project Design Document

POE Panel of Experts

RP Resettlement Plan

RPM Respirable Particulate Matter

SPM Suspended Particulate Matter

TCBEM Technical Committee for Biodiversity and Environment

Management

THyE Tangsibji Hydro Energy Limited

TRT Tail Race Tunnel

TSPM Total Suspended Particulate Matter

TSS Total Suspended Solids

WMD Watershed Management Division

WWF World Wildlife Fund

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Table of Contents

Executive Summary ........................................................................................................ 6

1.0 Introduction ............................................................................................................... 6

1.1 Brief Project Descriptions .......................................................................................... 6

1.2 Project progress status and implementation schedule .............................................. 8

Physical Progress for MP-1 Package Works ................................................................... 8

Physical Progress for MP-2 (M/s Voith Indai) ................................................................ 13

Material Receipt Status ................................................................................................. 13

Material Dispatch Status ............................................................................................... 14

Manufacturing Status .................................................................................................... 14

2.0 Compliance to National Regulations ....................................................................... 15

3.0 Compliance to Environmental Covenants from the ADB Loan Agreement .............. 20

4.0 Compliance to Environmental Management Plan.................................................... 27

4.1 Construction Phase ................................................................................................ 27

4.1.1 Establishment of a Biodiversity Management Committee .................................... 27

4.1.2 Catchment Management Plan .............................................................................. 27

4.1.3 Solid Waste Management at Offices, Colonies and Worker Camps..................... 28

Waste Reduction ........................................................................................................... 29

Waste Reuse ................................................................................................................. 29

Waste Recycling ........................................................................................................... 31

Waste Segregation for recycling ................................................................................... 32

Awareness .................................................................................................................... 32

4.1.4 Transmission line tower installation (Land Clearing) ............................................ 32

5.0 Safeguards monitoring results and unanticipated impacts ...................................... 33

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5.1 Environmental Monitoring ........................................................................................ 33

5.2 Occupational Health and Safety Monitoring ............................................................ 34

5.3 Monthly Hydrology Discharge Rate ....................................................................... 35

5.4 Vibration Monitoring ................................................................................................ 35

6.0 Grievance Redress Mechanism (GRM) ................................................................. 36

7.0 Conclusion .............................................................................................................. 37

Appendices ................................................................................................................... 38

Blast and Ground Vibration Monitoring Report .............................................................. 40

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List of Tables

Table-1 Physical progress of MP-1 Package ................................................................. 8

Table-2 Compliance To Environmental Clearance ........................................................ 15

Table-3 Compliance to Environmental Covenant of ADB Loan Agreement .................. 20

Table-4 Air Quality Measurements National Standard .................................................. 33

Table-5 Noise Measurements National Standard .......................................................... 34

Table-6 Safety Training and Drills................................................................................ 34

Table-7 Monthly Hydrology Discharge Rate .................................................................. 35

List of Figures

Figure-1 Location map of the project HRT alignment and geo-physical map ……………7

Figure-2 Construction of sedimentation tank by discarded dumper buck ...................... 29

Figure-3 Waste oils are stored in safe manner and displaced with proper signage ...... 30

Figure-4 Barrels reused to collect dry waste ................................................................. 30

Figure-5 Pet bottles used to create canopy at power house client facility ..................... 30

Figure-6 Cements bags reusing for blasting purposes for tunnel excavation ..……….. 32

Figure-7 Development of scrap yard ............................................................................. 31

Figure-8 Installation of wire mesh bins at the area adjacent to Tsheringma Drupchhu for

local vegetable vendors ................................................................................................. 32

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Executive Summary

The contractor has deployed 403 labours at the project site where 25.1 % of the

progress has been achieve for civil and hydro mechanical works and 76.13 for 132 kv

transmission line as of November 2,2018. The expenditure incurred on the investigation

of Nikachhu project till the inception of Tangsibji Hydro Energy Limited (THyE) amounts

to nu. 214.43 million. THyE had spent nu. 3,708.05 million from 2014 to till December

31, 2018.

Waste management, monitoring of noise, air and water quality, health and safety

meeting, housekeeping, monitoring along muck disposal area and along transmission

line are some of the activities covered in this quarter. The implementation of

environment management plan (EMP) and resettlement plan (RP) are in full swing and

frequent monitoring of the construction site is being carried out jointly with range office,

Tronga and Chendebji forest management unit.

1.0 Introduction 1.1 Brief Project Descriptions

The Environment and Social Impact Assessment (ESIA) studies, EMP and RP

of Nikachhu Project were carried out by M/s Bhutan Consultant and Research

(BHUCORE). M/s. Price Water Coppers (PWC) recruited by Asian Development

Bank (ADB) was in-charge of an oversight role for the ESIA.

Nikachhu Hydropower Project is located in Trongsa Dzongkhag and stretches

over 25 km from Dam, at Lorim, to Power House; at Norbuodi with 12.14 km

Head Race Tunnel (HRT) having five intermediate adits. With the construction

of 38 m high dam, 12.28 acres of land will be impounded by 810 m

water back-flow. The temporary land acquisition equivalent to 262.50 acres,

including the 59.3 acres land for the Transmission Line of Construction

Power, and the permanent land acquisition equivalent to 45.66 acres was

made for the project.

The Environmental Clearance for development of Nikachhu Project and 132 kv

Transmission Line was obtained from National Environment Commission of

Bhutan on July 01, 2014 and November 28, 2014 respectively. There was

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no physical displacement or significant resettlement impact. The total of

approximately 0.6 acre of land was required to be acquired for project and

transmission line. The total number of Household affected are 11 in project

areas and 4 Households for Transmission Line.

Figure-1 Location map of the project HRT alignment and geo-physical map

With an estimated energy generation of 491.52 MU, 85 % shall be exported

which will not only enable revenue generation for the nation but also reduce

Green House Gas emission in the neighboring country by replacement of

fuel by clean and renewable energy, hydropower. Further, the outflow from

Nikachhu Project into Mangdechhu reservoir provides additional energy

generation of 323.77 MU to Mangdechhu Hydro Electric Project. Currently,

the preparation of Project Design Document ( PDD) for Clean Development

Mechanism (CDM) registration stands completed and PDD has been submitted to

National Environment Commission for Host Country Approval.

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1.2 Project progress status and implementation schedule

Physical Progress for MP-1 Package Works

The physical progress for MP-1 packages as of December 31, 2018 against the

construction schedule is as following:

Table-1 Physical progress of MP-1 Package

Component

Progress Achieved till December 31,

2018 As per Revised Schedule

A. Head Works

A.1

Right Bank Excavation

Excavation should have

completed on 14/4/2018.

Out of the estimated quantity of

32,815 m3, completed the

excavation of 32,162.00 m3.

A.2

Left Bank Excavation


completed on 16/5/2018.

Completed 39,565 m3 out of total

excavation estimated quantity of

80,865 m3.

A.3

Adit to Desilting Chambers

Should have completed the

excavation on 15/5/2018.

Completed 100% on 18th December,

2018

A.5

Adit to D/s goc

Should have completed

excavation on 1/2/2018.

Out of total length of 208.58 m,

205.5 m has been completed.

Currently, the excavation is running

through adverse geology, hence the

progress is slow.

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A.6

SFT

Completed length 0f excavation of

123.7m of total length 340.87 m.

SFT branch excavation to be

completed by 1/3/2019.

A.7

Plunge Pool

Should have completed on

16/10/2018

Completed excavation quantity of

6,959 m3 of total quantity of 18,618

m3.

B. Head Race Tunnel

B.1

HRT Adits Should have completed

excavation on 29/1/2018 for Adit

I, Adit II on 10/1/2018, Adit III on

9/6/2018, Adit IV on 11/6/2018

and Adit V on 23/5/18.

All the adits of HRT (Adit I, II, III, IV

& V) have been completed.

B.2

Face 1

Completed excavation length of

307.3 m against the total length of

1093.21 m.

Should have completed

excavation by 11/6/2019

B.3

Face 2

Excavated the length of 261.5 m

against the total length of 1356.28

m.

Excavation should be

completed by 10/6/2019

B.4

Face 3

Excavation to be completed by

10/6/2019


443.5m against the total length of

10

1122.60 m.

B.5

Face 4


31/5/2019

Excavated 302.5m against the total

length of 1162.13 m.

B.6

Face 5

Out of total length of 1332.76 m,

completed excavation of 796.5m.


31/5/2019

B.7

Face 6

HRT Face 6 –Excavation to be

completed by 16/8/2019

High Ingression of water

encountered at the completed length

of 597.2 m on June 20, 2018.

Hence, realigning the tunnel was

carried out from RD 536m and is

completed excavation length up to

610 m.

B.8

Face 7

Excavation should complete by

16/8/2019

Out of total length 1357.67 m,

completed excavation of length

216.1 m.

B.9

Face 8


23/12/2019


completed excavation of length

200.5 m.

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B.10

Face 9

To be completed by 23/12/2019


completed excavation of length 6 m.

B.11

Face 10



completed excavation of length 6 m.

C. Power House Component

C.1

Adit to Surge Shaft Top


completed on 3/7/2018


244.6m against the total length of

397.04 m.

C.4

Power House Crown Excavation Excavation to be completed by

5/3/2019. 100% completed.

C.9

Adit to Top Bend of Pressure

Shaft(PAC)


December 9, 2018


50.6m out of total length of 108 m.

C.10

T/F Cavern Crown Excavation should have

completed on July 30, 2018 100% completed.

C.11

Bottom Horizontal Pressure Tunnel

(BHPT) U/s Adit

Bottom Horizontal Pressure

Tunnel excavation should be

completed on 28/12/2020 100% completed on November 30,

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2018.

C.12

Bottom Horizontal Pressure Tunnel

(BHPT) D/s Adit

100% completed on November 30,

2018.

C.13

Pilot Hole Upper Limb


Completed excavation length of 79

m out of total length of 307m.

C.14

Connecting Tunnel

Completed excavation length of 6.5

m out of total length of 307m.

C.15

Main TRT

D/s TRT: Completed excavation

length of 94.5 m out of total length

404 m.

D/s TRT should complete on

24/12/18

U/s TRT: Completed

U/s TRT should complete on

7/8/2019

C.16

Unit TRT

Completed excavation length for Unit

TRT 1 of 15 m out of 85 m and Unit

TRT 2 of 22.5 m out of 85 m.

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Physical Progress for MP-2 (M/s Voith Indai)

As on December 31, 2018, E&M progress is achieved up to 62.4%. The progress

work includes Engineering, Manufacturing/Procurement, and transportation of some

of the E&M Equipment/machines.

Material Receipt Status

The following E&M equipment had been dispatched and stored at Phuentsholing store

as on December 31, 2018:

a) 150 T/ 30 T/ 5 T Power House EOT Crane (Supplier- M/s Unique Industrial Pvt. Limited,

Nasik).

b) Earthing Rod (32 mm dia) -2 Lots (Supplier- M/s Magdiel Engineering Private Limited,

Gaziabad).

c) Distributor Pipe for Unit-1 and Unit 2 (Supplier- M/s Voith, Vadodara).

d) 11 kv Isolated Phase Bus Duct (Supplier- M/s C&S Electric, Hardiwar).

e) 7 Nos. Single Phase, 25 MVA Generator Transformers along with Mandatory Spares

(Supplier- M/s Toshiba T&D (India) Limited, Telengana).

f) 132 kv Disconnecting Switches with Earth Switch (Supplier-M/s ABB India Limited,

Vadodara).

g) PLCC System along with Mandatory Spares, Special Tools & Plants (Supplier-M/s ABB

India Limited, Mumbai).

h) Lightning Arrestors along with Accessories (Supplier-M/s Oblum Electric Industries,

Telengana).

i) 630 kva DG Set with accessories (Supplier-M/s Jackson Limited, Surat).

j) 1st Lot of PLCC System (Supplier-M/s ABB India Limited, Mumbai).

k) Capacitive Voltage Transformers (cvts) and Wave Traps (wts) (Supplier- M/s GE T&D

India Limited, Hosur, India).

l) 1st Lot of Cable Tray and Support System (M/s Indiana Gratings Private Limited, Pune,

India).

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m) Protection System (M/s GE T&D India Limited, Chennai, India).

n) Oil Handling and Purification System (M/s Cee Dee Vaccum Equipment Private Limited,

Pune).

o) 145 kv Gas Insulated Switchgear (Supplier- M/s Toshiba India Limited, Hyderabad).

p) 2 Lots Static Excitation System along Accessories (Supplier-M/s Voith Digital Solution,

Faridabad).

q) Unit Aux. Transformers, Station Aux. Transformer, Station Service Transformers and

Excitation Transformers (Supplier- M/s Raychem RPG India Limited, Pune).

r) Current Transformers (Supplier- M/s G.E T&D Limited, Hosur).

s) Generator Stator Bars for Unit#1 and Unit #2 (Supplier- M/s Voith Hydro, Brazil).

t) Stator Fixing Elements (Double Dovetail Bars) (Supplier- M/s ZOLLERN gmbh,

Germany).

u) PPV EOT Crane (Supplier-M/s GRIP Engineers Limited, Faridabad).

Material Dispatch Status

a) MDCC for Butterfly Valve issued on October 02, 2018 (Supplier- M/s Hubei Hongcheng,

China)

b) MDCC for High Pressure Unit of Main Inlet Valve and Penstock Protection Valve issued

on October 15, 2018. (Supplier- M/s Hydac India Limited, Coimbatore, India)

c) MDCC for Turbine Housing and Pit Liners including Anchorage Materials issued on

October 30, 2018 (Supplier- M/s Voith Hydro, Vadodara).

Manufacturing Status

a) Manufacture of Stator Frame completed. FAT completed at works of M/s VOITH at

Vadodara from September 26, 2018.

b) Manufacture of GIS EOT Crane completed. FAT successfully conducted at works of M/s

GRIP Engineers Limited, Faridabad on November 15, 2018.

c) Manufacture of Runner disc and blade at M/s Voith Hydro, Vadodara is under progress.

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2.0 Compliance to National Regulations

The Environment Clearance for construction of 118 MW Nikachhu Hydropower Project was accorded from National

Environment Commission Secretariat on July 01,2014 with the terms and condition highlighted in the table.

Table-2 Compliance To Environmental Clearance

Environmental

Clearance

Compliance requirement under this

regulation

Compliance status

Remark

Clause 9 The holder shall ensure that the

implementation of the proposed

project is strictly confined within the

allocated area.

Complied. Periodic monitoring carried out by Field

staff of the BFTD and CFU.

Clause 15 The holder shall ensure that local

residents, households, communities,

public, private parties and religious,

cultural, historical and ecologically

important site are not adversely

affected by the construction of

proposed project.

Complied.

NA


implementation of the proposed

project, except the Dam, does not

Being compiled With the construction of HRT for the

Nikachhu Project in progress, the Face 6 of

HRT ADIT III has been facing high water

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Environmental

Clearance


regulation

Compliance status

Remark

lead to blockage, storage or

diversion of river, stream, irrigation

channel, waterfall and underground

water source.

ingression since 1030 Hours of 20thjune,

2018.

He heavy discharge of water from the

ADIT-II has damaged a portion of the

irrigation located below the ADIT-III muck

yard. However currently 250 diameter

HDPE pipes with estimate length of 20

meters is layered to protect the irrigation

channel. For a long term restoration work,

consultation with Geog, Public and

contractor are being carried out.

Clause 19 The holder shall ensure that a buffer

of at-least 100 ft is maintained

between the project activities and

water streams.

NA Maintaining buffer from streams was not

practical where the road alignment has to

cut the water body. However, mitigation

measures, for elimination of impact on

water, such as causeways, and hume pipes

were constructed.

17

Environmental

Clearance


regulation

Compliance status

Remark

Clause 21 The holder shall ensure Biodiversity

Management Plan and

Compensatory Afforestation

Program are implemented in

coordination with the Department of

Forest and Park Services (DOFPS)

to minimize biodiversity impacts.

Complied. The institutional arrangements are in place

and activities being initiated.


construction works at Adit-II are not

carried out from 10 pm to 6 am.

Complied. The complete excavation work for the

ADIT-II on January 31,2018 with length of

766.5 m achieved against 764.54 m,

activities/construction works are minimal.

Clause 24 The holder shall ensure that felling

of trees if required are done only

upon obtaining approval from

DOFPS and as per the conditions of

the approval.

Complied. Trees are removed only after obtaining

approval from the DOFPS

Clause 28 The holder shall ensure that Complied. Construction waste are well disposed in the

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Environmental

Clearance


regulation

Compliance status

Remark

Environment Friendly Road

Construction techniques are

adopted for construction of access

roads.

designated area, cut and fill method is

adopted. Example rigid pavement of the

access road at Dam and Power House.

Clause 29 The holder shall ensure that the bio-

engineering practices are adopted

on all roadside slopes.

Complied. Bioengineering works are carried by

DOFPS. Fast growing plants such as

Erythrina sp. And fodder grasses are used.

Clause 30 The holder shall ensure construction

of side drains, cross drains,

causeways, and other supporting

structures to prevent soil erosion,

improve usability and sustainability

of road.

Complied. Cross drains and side drains are developed

where ever stream crosses the access

roads.

Clause 36 The holder shall ensure that no raw

materials of any kind, machineries,

plants and equipment and

excavated materials are staked

Complied Plants, machines, equipements and

excavated are managed within the project

area.

19

Environmental

Clearance


regulation

Compliance status

Remark

along the highway.

Clause 37 The holder shall ensure safe and

smooth flow of traffic along the

highway.

Complied. Movement of the project vehicle are along

the highway are minimal and safety is

being ensured.

Clause 40 The holder shall ensure dusts are

suppressed.

Complied. Activity such as regular sprinkling of water

is initiated.

Clause 46 The holder shall ensure that dump

sites are stabilized with appropriate

protection measures

Complied. All dump sites are developed with

protection wall/gabion wall.

Clause 52 The holder shall ensure that waste

generated from the labour camps

and work sites are managed as

required under WPMA of Bhutan.

Complied. Dust bins with labels are provisioned at

labour camp for segregation. Compost pits

are developed at each communal mess

area. Mass cleaning practiced every 2nd

date of every month and one garbage

compactor is placed for safe and

environmentally disposal of the wastes.

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Environmental

Clearance


regulation

Compliance status

Remark

Clause 59 The holder shall ensure that safety

gadgets are provided to all workers

and any person entering the

worksite.

Complied. PPE are provided to workers and person

entering the worksite.

Clause 66 Ensure that signboards are erected

at the starting point of the project

area

Complied Signboards are erected

3.0 Compliance to Environmental Covenants from the ADB Loan Agreement

Table-3 Compliance to Environmental Covenant of ADB Loan Agreement

Schedule #, para. # Covenant Compliance status Remark

Schedule 5,

Paragraph 3

The Beneficiary shall ensure, or cause DGPC

and THyE to ensure, that the preparation,

design, construction, implementation,

operation of the Project and all Project facilities

comply with (a) all applicable laws and

regulations of the Beneficiary relating to

Complied.

21


environment, health, and safety; (b) the

Environmental Safeguards; (c) the ESIA; and

(d) all measures and requirements set forth in

each EIA and EMP, and any corrective or

preventative actions set forth in a Safeguards

Monitoring Report.

Schedule 5,

Paragraph 4

The Beneficiary shall ensure, and cause

DGPC and THyE to ensure, that (a) there are

no measurable adverse impacts on critical

habitat that could impair its ability to function;

(b) there is no reduction in the population of

any recognized endangered or critically

endangered species; and (c) any lesser

impacts are mitigated. Without limiting the

generality of the foregoing, the Beneficiary

shall cause DGPC and THyE to establish a

biodiversity management committee

acceptable to ADB that (a) shall be responsible

for implementation monitoring and evaluation

of the biodiversity conservation and

Complied. Biodiversity Management

Committee constituted.

Monitoring and implementation

are done by the committee.

22


biodiversity management plan as outlined in

the relevant EMP and (b) shall ensure that the

Project facilities are constructed and operated

in a manner consistent with the JSWNP

Management Plan

Schedule 5,

Paragraph 5

The Beneficiary shall cause DGPC and THyE

to (a) assess on a continuous basis, in

accordance with the relevant EMP, the

minimum environmental water flow

requirements during the operation of the

Project facilities; and (b) ensure a minimum

water flow, at a level acceptable to ADB, so as

to minimize downstream impacts and make

sure there is no net loss of downstream

aquatic biodiversity arising from the operation

of hydropower facilities in the Mangdechu river

basin, including from the Project facilities and

the Mangdechu Hydroelectric project. The

Beneficiary shall cause DGPC to establish a

funding mechanism or internal resources to

Not relevant at this

stage of project

phase.

23


ensure integrated water resources

management for the Mangdechu river basin,

including compliance with the minimum

environmental water flow requirements as set

out in the preceding sentence

Schedule 5,

Paragraph 6

The Beneficiary shall ensure, or cause DGPC

and THyE to ensure, that all land and all rights-

of-way required for the Project, and all Project

facilities are made available to the Works

contractor in accordance with the schedule

agreed under the related Works contract and

all land acquisition and resettlement activities

are implemented in compliance with (a) all

applicable laws and regulations of the

Beneficiary relating to land acquisition and

involuntary resettlement; (b) the Involuntary

Resettlement Safeguards; and (c) all

measures and requirements set forth in the

RP, and any corrective or preventative actions

Being Complied. Land acquisition and

Resettlement activities are

carried out in accordance with

applicable laws and regulation.

All necessary compensation

such as land development cost

are disbursed, land

replacement are processed by

National Land Commission.

24


set forth in a Safeguards Monitoring Report.

Schedule 5,

Paragraph 7

Without limiting the application of the

Involuntary Resettlement Safeguards, and the

RP, the Beneficiary shall ensure or cause

DGPC and THyE to ensure that no physical or

economic displacement takes place in

connection with the Project until (a)

compensation and other entitlements have

been provided to affected people in

accordance with the RP; and (b) a

comprehensive income and livelihood

restoration program has been established in

accordance with the RP

Complied. Land development cost and

restricted land use allowance

are disbursed to the affected

house hold as per RP and

livelihood restoration

programme such as weaving,

dying training are given.

Schedule 5,

Paragraph 11,

bullet ‘a’

Submit quarterly Environmental Safeguards

Monitoring Reports and semi-annual

Involuntary Resettlement Safeguards

Monitoring Reports to ADB during construction

of the Project facilities and annual

Environmental Safeguards Monitoring Reports

Being complied.

25


during operation of the Project facilities, and

disclose relevant information from such reports

to affected persons promptly upon submission;

Schedule 5,

Paragraph 11,

bullet ‘b’

If any unanticipated environmental and/or

social risks and impacts arise during

construction, implementation or operation of

the Project that were not considered in the

relevant EIA, EMP or the RP, promptly inform

ADB of the occurrence of such risks or

impacts, with detailed description of the event

and proposed corrective action plan;

Complied.

ADB and relevant agencies

(NEC) has been informed

during occurrence of

unanticipated environmental

and social risk. E.g. Impact

bought by the Face 6 incident

on irrigation channel and

drying up of a stream.

Schedule 5,

Paragraph 11,

bullet ‘c’

No later than 31 March 2015 engage a panel

of experts to monitor and report upon Project

implementation, and facilitate the carrying out

of any monitoring activities by such panel; and

Complied. Panel of Expert engaged as

desired by the schedule 5,para

11.

Periodic monitoring carried out

by the POE on implementation

of the EMP and RP

Schedule 5, Report any actual or potential breach of Complied. Compliance are achieved

26


Paragraph 11,

bullet ‘d’

compliance with the measures and

requirements set forth in the relevant EIA,

EMP or the RP promptly after becoming aware

of the breach.

without any breach.

27

4.0 Compliance to Environmental Management Plan 4.1 Construction Phase 4.1.1 Establishment of a Biodiversity Management Committee

Biodiversity Management Committee as constituted for effective implementation of

Biodiversity Conservation Programme enlisted in EMP, with members from different

stakeholders such as Forest Officers from the Wildlife Conservation Division, Jigme

Singye Wangchuck National Park (JSWNP), Forest Territorial Division and

Dzongkhag Forest Office, Zhemgang; National Biodiversity Center; Royal Society

for Protection of Nature; Department of Livestock; and THyE. The first committee

meeting was held from 2-4 February 2016.

The third Technical Committee for Biodiversity and Environment Management (TCBEM)

meeting was held on March 29, 2017. During the meeting, as decided in the second

TCBEM meeting, conservation proposals were presented by various members of which

establishment of rescue center, wildlife survey, Golden Langur radio tagging and Eob

tagging of Hornbill was given priority.

Followed by fourth TCBEM (Attached as Annexure-I) meeting held at November 28, 2018

at Thimphu following points were discussed:

Wildlife conservation on rescue and release programme, Wildlife Surveys and

Monitoring in the Biological Corridor

Anti-Poaching Measures

Development of Eco-tourism – e.g. Development of Bird watching trail

Raising Awareness on Environmental Safeguards

Wildlife Surveys and Monitoring in the Biological Corridor

4.1.2 Catchment Management Plan

The EMP requires various catchment management programs comprising rapid

classification of micro-watersheds, assessment of critical micro-watersheds, and

implementation of management plans.

The Watershed Management Division (WMD) under DOFPS has carried out rapid

assessment of watershed along Nikachhu since September 2015 under the fund

covered by World Wildlife Fund (WWF). 32 sub-watersheds were assessed including

28

13 in Tangsibji Geog. 31 sub-watersheds are classified and normal and one as pristine.

However, four sub-watersheds are classified as degraded by f u n c t i o n of

which two Tsheringmaa Drupchhu and Zalamchhu) fall in Nikachhu project area. The

WMD is currently preparing Integrated Watershed Management Plan (IWMP) for the

two micro-watersheds under Sephu and shall not cover degraded sub-watershed under

Tangsibji.

During fourth TCBEM meeting following discussion were held on Catchment

Management Plan:

WMD informed that the Integrated Watershed Management Plan for the Nikachhu

catchment is being prepared under the fund support of WWF.

It was informed that the report did not cover Tsheringma Drupchu.

In this regard, the Chairman informed the WMD to study Tsheringma Drupchu and

submit proposal to THyE before February 2019 with the financial implications in detail.

The study on Tsheringma Drupchu will be discussed during the fifth TCBEM and then

forward for approval to THyE and the Gross National Happiness Commission (GNHC)

for final execution.

4.1.3 Solid Waste Management at Offices, Colonies and Worker Camps

M/s HCC has employed 790 non-national labours and 42 national labours at the

construction site of the project. The sources of the waste is mainly generated from

temporary colonies and construction site. Waste are generally categorized into two:

Wet and Dry waste from the project area. Dry waste includes PET bottles, papers,

card boards, metals, glasses and organic, oil and grease as wet waste. Improper

waste management would cause negative impact on visual aesthetic and may deter

mine Health and Environment of the workers. As per Waste prevention and

management act 2009, waste shall be reduced at source, reused, recycled and

disposed in sound manner.

Solid Waste Management at offices, colonies and workers camps in line with Waste

Prevention and Management Regulation 2012, THyE listed out some of the the

activities initiated to put into practice to promote Reduce, Reuse, Recycle, and

29

waste segregation at construction site of the 118 MW Nikachhu Hydro Power

Project.

Waste Reduction

Electricity and LPG is used for cooking and heating proposes. Establishment of

communal mess at each project site has resulted to use resources efficiently and

effectively. The project is able to establish 7 communal mess with medium size

water boilers are being distributed to minimize use of mineral water bottles at the

construction site.

Waste Reuse

It’s a widely adopted method in the project area, HCC has stored the waste oils into

barrels and are specifically used in the maintenance and running of the machines.

Cement bags are used inside the tunnel for blasting purposes. Metal, rods and CGI

sheet are used in the construction of the residential and sheds at the construction

site.

Figure-2 Construction of sedimentation tank by discarded dumper buck

30

Figure-3 Waste oils are stored in safe manner and displaced with proper signage

Figure-4 Barrels reused to collect dry waste

Figure-5 Pet bottles used to create canopy at power house client facility

31

Figure-6 Cements bags reusing for blasting purposes for tunnel excavation Waste Recycling

Compost pits are established at each project mess area with an aim of reducing the

waste from the source. The compost pits located at communal mess area at dam and

Adit-I was not advisable on noticing Human Wildlife confrontation especially with

monkeys. For this reasons wet waste from these two areas are being collected and

disposed to the Zongkhalum landfill site in Trongsa municipal area.

Figure-7 Development of scrap yard

Scrap yard established at ADIT-II for effective storage, the scrap will be sold to the

relevant company after completion of the construction phases.

32

Waste Segregation for recycling

At the construction site, contractor has developed scrap yard with respect to the

availability of the space. One such scrap yard has been developed at ADIT-II and ADIT-

III construction site owing to the availability of the spaces. For the client facility two-

wheeler garbage bins are being distributed to practice waste segregation at sources.

Figure-8 Installation of wire mesh bins at the area adjacent to Tsheringma Drupchhu for local vegetable vendors

Awareness

In promotion to Druk Green Being initiative, DGPC has started off with the Being Green

initiative and advocacy program to protect river catchment areas and improve waste

management programme in which schools participate in the waste collection and are

awarded with cash prizes both from Druk Green and Greener way depending on th

Waste collected. Such initiatice can be replaced and their parents to reduce waste

(especially in Tangsibji villange which is nearby).

4.1.4 Transmission line tower installation (Land Clearing)

The 10% advance amounting to Nu. 23.380 million was released by THyE to BPC

on December 14, 2016. As per the directives of DHI and BPC Board, BPC have

awarded the erection works of transmission line to CDCL. The Contract was

signed between BPC and CDCL on July 26, 2017 at Nu. 113.862 million. CDCL

33

had completed erection of tower at 4 locations, foundation casting of14 tower

locations and benching of 35 tower locations.

Initially, the transportation of construction materials by machineries was

not envisaged. However, considering the rugged terrain and steep

topography, the marching of machineries was required for transportation of

heavy tower materials from road head to some tower locations. Because o f

the s i te condi t ions and requirements, temporary approach road of total length

2,750.10 meter and 3-meter width was constructed at 15 access point. The

access road construction required clearing of bushes. The Forest Clearance for

the machine marching were accorded on July 25, 2018 from Department of

Forest and Parks Services, Bumthang Division. Once the construction of 132

kv transmission line is completed, the area shall be restored to its original state.

As of December 31, 2018, CDCL has completed foundation casting of 25 towers,

benching of 47 towers location and tower erecting of 8 locations. The overall

progress as per BPC is 76.13%.

5.0 Safeguards monitoring results and unanticipated impacts

5.1 Environmental Monitoring Table-4 Air Quality Measurements National Standard

Component RSPM

(µg/m3)

TSPM

(µg/m3)

Permissible limit 24 hour Weather

RSPM (µg/m3)

limit

TSPM (µg/m3)

limit

Power 16 55.2 200 100 Sunny

HRT 19.1 30.21 200 100 Rainy

Dam 28 46.71 200 100 Sunny

34

Table-5 Noise Measurements National Standard

Project Sites Noise (db) Noise Standard

Day Night Industrial area

Dam Site 54 58.3 Day 75

Head Race Tunnel 57 57 Night 65

Power house 59 60 Unit Decibel

During the current reporting period all the standards were within the permissible limit.

Air samples are taken from Dam, Head race tunnel and Power house.

5.2 Occupational Health and Safety Monitoring

The 8 (Eight) Joint Safety Committee held at Tashiling on December 25, 2018

and covered major aspects of Safety. Following are the observation and the

compliance made by the contractor.

Table-6 Safety Training and Drills

Trainings/drills/

inspections

Number and

position of

participant/s

Location/s and

date/s

Remarks

Defensive driving

training

61 drivers/laborers August 28, 2018 All participants

received the training

well

No accident record has been reported during current monitoring period, 61 drivers has been given the defensive driving training. Attendance sheet is attached in the Appendices.

35

5.3 Monthly Hydrology Discharge Rate

Gauging station is set up at Lorim at an elevation 2,362.0 meters. While,

Nikachhu collects the site data, National Center for Hydrology Meteorology,

Thimphu carries out the monthly flow rate analysis of the Nikachhu River.

Table-7 Monthly Hydrology Discharge Rate

National Center For Hydrology Meteorology, Thimphu

Station Number:

14350045

Annual Report of Daily Data: Daily Flow Longitude: 90:21:54 E

Station Name: Chendibi on nikkachhu Lorim (Dam site) Latitude: 27:27:17 N

Time-Series Type: Flow (cumecs) Elevation: 2362.0 meters

Mean 5.692

Flow (MCM) 15.246

Maximum 6.379

Minimum 4.882

Runoff (mm) 0

5.4 Vibration Monitoring

Ground Vibration Monitoring Instrument was installed at the five identified locations

vis-a-vis Chendebji Chorten, Trashiling Lhakhang, Tshangkha Central School,

Raven Resort and Trongsa Dzong from June 07-11, 2016 by Center of Excellence

for Vibration and Thermographic Analysis (coevata, DGPC) and THyE.

Coevata, DGPC conducted a sensitization program on aspects of vibration

monitoring equipment for the stakeholders on August 10, 2016 subsequent to the

request from Trongsa Dzongkhag vide letter no. DAT/DZFO-03/2015-2016/9078

36

dated May 19, 2016. The sensitization program was contingent to the first blast of

the project. The ground vibration of the first blast at Diversion Tunnel and Adit 3 was

monitored and observed that the ground vibration was within the permissible limits.

As per the relevant standards, the permissible limit for the ground vibration and air

overpressure for the instrument is maintained at 2.00 mm/s and 120.00 db

respectively. The ground vibration and air overpressure due to blasting will

continuously be monitored at the five locations mentioned above throughout the

project construction period.

The Ground Vibration and Air Overpressure data from the instrument were

downloaded on December 6-7, 2018 by representatives from coe-Condition Based

Mechanical Assessment (CBMA), DGPCL and THyE. It was observed except for the

instrument installed at Ta Dzong, all the other instruments were found to have been

triggered and data were available. An analysis report has been submitted by CBMA

to THyE based on the data collected vide letter no. DGPC/HR&DC/coecbm/CBMA-

22(F)/2018/379 dated December 20, 2018. The report indicates that none of the

readings recorded by the ground vibration monitoring instrument were triggered as a

result of blast taken by the Project. The blast timing and the details of the reading

recorded by the instrument were compared for confirmation. Ground Vibration

Monitoring Report is attached in Appendices for further reference.

6.0 Grievance Redress Mechanism (GRM)

The organogram of GRM is set based upon prevailing government structure,

pertaining to Geog Yargey Tshogchung and Dzongkhag Yargey

Tshogde, representatives from Geog Administration, Dzongkhag Administration and

THyE. All the parties are involved in producing effective resolution if Project

Dispersed Person has grievance and shall be submitted in written form to the

committee.

The committee was activated on October 07, 2016 discussing vital functions and

role of the committee. As of date Geog Administration, Dzongkhag Administration

and THyE are working closely to resolve any arising social issues. No issues were

raised during the monitoring period by the Geog.

37

7.0 Conclusion

The current monitoring surpasses to comply with National Environment Assessment

Act 2000 requirement wherein National Environment Commission has issued no

observation on the waste management practice in the construction site. Indeed, the

annual waste compliance and performance for the project has been submitted to the

National Environment Commission and no major observation on the compliance has

been made at the construction site.

38

Appendices

39

40

Blast and Ground Vibration Monitoring Report

GROUND VIBRATION ASSESSMENT REPORT OF TANGSIBJI HYDRO ENERGY (October Cycle, 2018), TRONGSA

Submitted to

Downloading Date

Downloading carried out by

Report Prepared by

: Thinley Lhamo, Head, Design Division, Tangsibji Hydro Energy Limited

(Developer of 118 MW Nikachhu Hydropower Project)

: 5th November 2018

: Sherub Tharchen & representative from THyE

: Sherub Tharchen, Head, CBMA/ Vibration Analyst CAT-II

41

Content

1. Executive Summary……………………………………………………………………………………….3 2. Purpose…………………………………………………………………………………………………....3 3. Methodology……………………………………………………………………………………………...3 4. Instrumentation…………………………………………………………………………………………...3 5. Acceptance Criteria……………………………………………………………………………………….4 6. Assessment………………………………………………………………………………………………..4

6.1. Chendebji Chorten…………………………………………………………………….................4 6.2. Trashiling Lhakhang……………………………………………………………………………...5 6.3. Tshangkha Central School…………………………………………………………………….5-22 6.4. Raven Resort…………………………………………………………………………………….23 6.5. Trongsa Dzong…………………………………………………………………………………..23 6.6. Ta Dzong……………………………………………………………………………………..23-24

7. Summary and Conclusion………………………………………………………………………………..24 8. Recommendation………………………………………………………………………………………..24

Condition Based Mechanical Assessment (CBMA) Unit

Centre of Excellence for Condition Based Monitoring Division

Hydropower Research & Development Centre

Rinchentse, Druk Green Power Corporation Limited

Web: www.drukgreen.bt

2

42

1. Executive Summary

118 MW Tangsibji Hydro Energy Limited (THyE), a 100 % subsidiary company of Druk Green Power Corporation Limited was incorporated on April 25, 2014. Geographically, the project lies in a location where many historical structures and monuments are situated. With the project kick-start, a major access road and tunneling constructions were being carried out with series of blasting operations. This report is to satisfy and inform Tangsibji Hydro Energy Limited and the public around about the true ground borne vibration and air overpressure intensity during blasting operation. Blasting operations can have unacceptable noise and vibration impacts if not conducted correctly. Excessive levels of structural vibration due to ground vibration from blasting can cause substantial damage to structures. People can detect vibration at much lower levels than those that would cause even superficial damage to the most susceptible structures.

2. Purpose

The purpose of this report is to inform Tangsibji Hydro Energy Limited and the public around about the true ground borne vibration and air overpressure intensity during blasting operation. Further, to provide conclusive justification if ever alleged cracks are surfaced in the structures. The findings provided in this report is as per the international standards.

3. Methodology

A dual channel monitor (Micromate), tri axial ISEE Geophone and standard overpressure microphone were used to record the online ground vibrations. A far field methodology is adopted for compliance monitoring. The minimum geophone trigger limit was set at 2 mm/s and 120 dB (L) for microphone in all the six instrument. The geophone range is from 0.127 – 254 mm/s and microphone from 100-148dB.

4. Instrumentation

Sl.#

Instrument Sl.no (Micromate)

Location

1 UM8135 Chendebji Chorten

2 UM8134 Trashiling Lhakhang

3 UM8139 Tshangkha Central School

4 UM8138 Raven Resort

5 UM8137 Trongsa Dzong

6 UM8136 Ta Dzong






43

3

5. Acceptance Criteria : DGMS India (A)

Type/ Structure

Dominant Exciting Frequency

<8 Hz 8-25 Hz >25 Hz

(A) Building/ Structures not belonging to the owner

1. Domestic houses/ structures (Kucha, bricks and cement) 5 10 15

2. Industrial Building 10 20 25

3. Objects of historical importance and sensitive structures 2 5 10

(B) Building belonging to the owner with limited span of life

1. Domestic houses/ structure 10 15 20

2. Industrial building 15 25 50

1.0 psi (171 dB)

General window breakage

0.1 psi (151 dB) Occasional window breakage

0.02 psi (140 dB) Long-term history of application as a safe project

0.0145 psi (134 dB) Bureau of mines recommendations following study of large scale mining

blasting

6. Assessment Report

6.1. Chendebji Chorten

Table 1. Summary of blasting operation

Sl.#

Date

Blast Location

Remarks

1 1st to 31st Dam right bank, No events were recorded by the instrument. Low energy from the blast

Oct. Dam pit, SFT, could be the possible reason for not triggering the instrument. Blast

2018 Adit to DC &C

details (Annexure - I).

The minimum trigger limit for geophone and microphone were set at 2

mm/s and 120 dB (L) respectively. It is recommended to follow the

control blasting and also monitor the healthiness (breathing and memory

status) of the equipment. Intimate CBMA, HR&DC for any issues related

to the equipment and for abnormal blasting.






44

4

6.2. Trashiling Lhakhang

Table 2. Summary of blasting operation

Sl.# Date Blast Remarks

Location

1 1st to Face-1, 2, 3,

31st Oct. 4,5,6,7 & 8.

2018

No events were recorded by the instrument. Low energy from the blast could be the possible reason for not triggering the instrument. Blast details (Annexure - I).

The minimum trigger limit for geophone and microphone were set at 2 mm/s and 120 dB (L) respectively. It is recommended to follow the control blasting and also monitor the healthiness (breathing and memory status) of the equipment. Intimate CBMA, HR&DC for any issues related to the equipment and for abnormal blasting.

45

6.3. Tshangkha Central School

Table 3. Summary of the blasting operation.

Sl. Date Blast Maximum Peak PVS Sound Dominant Frequency (Hz)

No location Velocity (mm/s) Pressure

(mm/s) (dB)

Vert. Long. Trans. Trans. Vert. Long

1 01.10.18 Face -7 & 8 0.36 0.33 0.47 0.56 122.7 15.25 12 13

2 06.10.18 Face -7 0.37 0.38 0.37 0.52 121.6 15.25 11.75 7.5

3 10.10.18 Face -7 0.44 0.50 0.44 0.65 124.4 7.5 12 7.5

4 22.10.18 Face -7 & 8 0.33 0.40 0.44 0.52 121.2 13 12.75 13.25

5 23.10.18 Face - 7 0.48 0.52 0.52 0.60 123.1 12.76 12.76 9.25

6 24.10.18 Face - 7 0.34 0.40 0.41 0.50 120.5 7.5 6.26 7.75

7 26.10.18 Face – 7 & 8 0.42 0.44 0.52 0.59 121.4 12.75 13.25 12.5

8 30.10.18 Face - 7 & 8 0.38 0.42 0.48 0.50 120.6 12.75 13 12.25

Maximum vibration amplitude of 0.65 mm/s with 124.4 dB sound intensity was recorded. Majority of the values were observed to be due to sound over pressure from the blast operation (Refer Table 1, Annexure 1 and Figure 1, 2 & 3). The instrument detected 8 true events out of numerous blasting operations carried out at the faces. The minimum trigger limit for geophone and microphone was set at 2 mm/s and 120 dB (L) respectively. Also, the recorded events were compared with the blasting timing for authentication and analysis.

Over the period and compared to other locations, maximum readings were seen recorded by the instrument (UM8139). The area (Tshangkha Central School) seems more sensitive to the blast operation, however the recorded readings were observed to be with the permissible limit and doesn’t foresee structural damages from it.






5

46

In addition, it is recommended to follow the control blasting and also monitor the healthiness (breathing and memory status) of the equipment on regular basis. Intimate CBMA, HR&DC for any issues related to the equipment and abnormal blast operation.

Figure 1. Events list recorded by instruments (UM8139) at Tshangkha Central School






6

47

(i)

Condition Based Mechanical Assessment (CBMA) Unit Centre of Excellence for Condition Based Monitoring Division




7

48

(ii)





8

49

(iii)





9

50

(iv)





10

51

(v)





11

52

(vi)





12

53

(vii)





13

54

(viii)

Figure 2. Event report





14

55

(i)





15

56

(ii)





16

57

(iii)





17

58

(iv)





18

59

(v)





19

60

(vi)





20

61

(vii)





21

62

(viii)

Figure 3.FFT Report





22

63

6.4. Raven Resort

Table 4. Summary of the blasting operation


Location

1 1st to Adit to surge No events were recorded by the instrument. Low energy from the blast could

31st Oct. shaft top, be the possible reason for not triggering the instrument. Blast details

2018 pressure (Annexure - I).

tunnel, TRT,

Power and The minimum trigger limit for geophone and microphone were set at 2 mm/s

Transformer and 120 dB (L) respectively. It is recommended to follow the control blasting

Cavern and also monitor the healthiness (breathing and memory status) of the

equipment. Intimate CBMA, HR&DC for any issues related to the equipment and

for abnormal blasting.

6.5. Trongsa Dzong



Location

1 1st to Adit to surge No events were recorded by the instrument. Low energy from the blast could

31st Oct. shaft top, be the possible reason for not triggering the instrument. Blast details

2018 pressure (Annexure - I).

tunnel, TRT,

Power and The minimum trigger limit for geophone and microphone were set at 2 mm/s

Transformer and 120 dB (L) respectively. It is recommended to follow the control blasting

Cavern and also monitor the healthiness (breathing and memory status) of the



6.6. Ta Dzong



Location

1 1st to Adit to surge Two events were observed to be recorded by the instrument on dated 2oth &

31st Oct.

shaft top,

23rd October, 2018 (figure 4 & annexure - 1), however those events were not in-

2018 pressure line with the blast timings. It might be trigged due to the external sources and

tunnel, TRT, it is beyond the scope of this report.

Power and

Transformer The minimum trigger limit for geophone and microphone were set at 2 mm/s

Cavern and 120 dB (L) respectively. It is recommended to follow the control blasting

and also monitor the healthiness (breathing and memory status) of the








64

23

Figure 4. Event list recorded by instrument (UM8136) at Ta Dzong

7. Summary and Conclusion

The instrument installed at Tshangkha Central School has recorded majority of the vibration and sound overpressure values. The instrument recorded 8 true true events out of numerous blasting operations carried out at the faces and majorities were excited due to sound over pressure. Maximum vibration amplitude of 0.65 mm/s with 124.4 dB sound intensity was recorded. The readings were within the permissible limit and doesn’t foresee structural damages from it.

8. Recommendation

Over the period and compared to other locations, maximum readings were seen recorded by the instrument (UM8139). The area (Tshangkha Central School) seems more sensitive to the blast operation. Therefore, it is recommended to follow the control blasting and also monitor the healthiness (breathing and memory status) of the equipment on continues basis. Intimate CBMA, HR&DC for any issues related to the equipment and for abnormal blast operation.

(Sherub Tharchen)






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