SFG2795 REV

Public Disclosure Authorized Trung Son Hydropower Project Public Disclosure Authorized

Environmental and Social Management Plan (ESMP) for Reservoir Impoundment Public Disclosure Authorized Public Disclosure Authorized

22 December 2016

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Table of Contents

1 Introduction 5 1.1 Background 5 1.2 Objectives of this report 6 1.3 Geographical scope of study 6

2 Methodology 7 2.1 Background 7 2.2 Approach 7

3 Review of possible technical solutions 8

4 Baseline information 10 4.1 Background 10 4.2 Receptors 10 4.2.1 Introduction 10 4.2.2 Riverine ecosystem 10 4.2.3 Resource users 11

5 Assessment of potential effects 11 5.1 Changes in river flow during reservoir filling 11 5.2 Potential effects 13

6 Environmental and Social Management Plan (ESMP) 23 6.1 Management of reservoir area 23 6.2 Approach and measures for mitigate downstream impacts 23 6.3 Communications 28 6.4 Staffing and resource 29 6.5 Implementation arrangement 29 6.6 Reporting 29 6.7 Estimated cost for implementation of ESMP 30 Annex 1: Local authorities and communities consulted 33 Annex 2: Reservoir Filling Communications Plan 35 Annex 3: Monitoring team 37 Annex 4: Steering committee for reservoir impoundment 38 Annex 5: Small streams downstream 41

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List of Abbreviations

% Percent 0C Degrees Celsius CPC Communal peoples’ committee DPC District peoples’ committee D/S Downstream (of river flow) Ha Hectares kg/s Kilograms per second Km Kilometer 2 km/km Density (for stream network) 2 km Square kilometers kV Kilovolts M Meter m/s Meters per second m3 Cubic meters m3/day Cubic meters per day m3/ha Cubic meters per hectare m3/s Cubic meters per second m3/year Cubic meters per year Mm Millimeters MW Megawatt pH Potential of hydrogen ions RCC Roller compacted concrete 3 ton/m Tons per cubic meter TSHPP Trung Son Hydropower Project TSHPC Trung Son Hydropower Project Company USD U.S. Dollars V Volts VND Vietnam Dong

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1 Introduction 1.1 Background The 260 MW TSHPP is located on the Ma River, approximately 700 m downstream of its confluence with Quanh brook, in the Trung Son commune, Quan Hoa district in the province of Thanh Hoa, Vietnam (See Figure 1-1). The project site is located near three protected areas, the Xuan Nha, Pu Hu and Hang Kia-Pa Co Nature Reserves. When completed the project components will be as follows: - An 84.5 m high dam with a crest length of 513 m. - A total reservoir area of 13.13 km2, with a volume of 348.5 million m3 at full supply level (FSL), at an elevation of 160 m (FSL) and a minimum operating level (MOL) at 150 m. - A 20.4 km access road from Co Luong (Mai Chau, Hoa Binh province) to Co Me (Trung Son, Thanh Hoa province); the access road includes two major bridges, one at its junction with National Road 15 and the other over the Ma River to access the right bank of the river. - 65 km of 220 kV double-circuit transmission l ine to connect the project to the Hoa Binh – Nho Quan 220kV line, in Tan Lac District. The construction of the main dam of Trung Son Hydropower Project (TSHPP) is almost complete and reservoir filling is scheduled for late December 2016. From the environmental and social perspective, guaranteeing minimum water releases (often referred to as environmental flows) during reservoir filling and at all times during subsequent operations is both an obligation under domestic law and regulations (reinforced by a ministerial order), and a key requirement of the project EMP. Trung Son Hydropower Project Company (TSHPC) thus is obliged to provide a design and an implementation plan that ensures compliance with this important environmental parameter. At the project appraisal, the reservoir impoundment was scheduled in the late rainy season requiring up to a week to complete the filling. Various studies demonstrated that there are no protected or threatened species existing in the project areas thus the potential downstream impacts were expected to be limited. Further, international experience showed that rivers are very resilient and can quickly recover from such short term impacts with limited water flow. The project was envisaged to release the required environmental flow via the sluicing outlet in 2-3 days after commencing reservoir filling. Hence, no technical solutions and environmental and social management plan for downstream during the reservoir impoundment were required. However, during project implementation, the dam safety review panel recommended not to fill the reservoir in the rainy season for safety reasons which resulted that the reservoir filling period increased to up 3 weeks before the project can release water through the spillway. As the sluicing outlet is located above the diversion culverts that need to be filled with concrete taking up to 3 months that outlet cannot be used to release water flows during the reservoir filling. Subsequently, TSHPCo investigated various alternative technical solutions but none of the alternatives were technically or economically feasible and viable to provide at least 15 cubic meter water flow downstream during reservoir filling (see section 3. Review of possible technical solutions). Therefore, this Environmental and Social Management Plan for Reservoir Impoundment (ESMP) was developed to monitor and mitigate adverse downstream impacts during the reservoir impoundment. The impacts and mitigation measures for the reservoir area and downstream due to construction and operation of the HPP have been included in the project Environmental and Social Impact Assessment (ESIA) and Environmental Management Plan (EMP) thus will not be covered under this ESMP. Mitigation measures included below have been satisfactorily completed to date:

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- Completion of relocation of the affected households and compensation for resettlement and their asset losses including cultivation land in the reservoir areas. All these have been completed. - Preparation and implementation of a reservoir clearance plan for clearing the biomass and any wastes in the reservoir area. The plan was prepared and the reservoir was cleared according to the plan. MONRE has issue a letter on reservoir clearance completion. - Prepare and implement a plan for salvage of the PCRs located in the reservoir area. These have also been completed, the artefacts have been salvaged and the affected graves have been relocated. - Development of a water quality modelling for monitoring water quality changes in the reservoir area and downstream for adjustment of the operation of the hydropower plant if needed to ensure upstream and downstream water quality is not degraded due to the plant operation. This modelling is being implemented. 1.2 Objectives of this report The objectives of the study were to (i) identify and assess the anticipated environmental and social (E&S) impacts resulting from the planned reservoir filling at TSHPP; and (ii) develop effective and monitorable mitigation and management measures to minimize adverse impacts on valued environmental components as well as livelihoods downstream of the dam. This report reflects findings and conclusions from joint fieldwork conducted by TSHPC environmental and social staff and the World Bank’s consultant and task team. The joint mission covered the TSHPP and identified downstream impacted areas over the course of one week, and supplemented by additional ground work by TSHPC staff. This report constitutes an overview of the environmental and social aspects and impacts associated with the first reservoir impoundment, and a description of the approach and actual implementation of mitigation measures planned by TSHPC. 1.3 Geographical scope of study The geographical scope of the assessment covers 43km downstream of the dam to the confluence between Ma and Luong rivers. This area has been determined based on the fact that the additional flows from Luong river to Ma River at the confluence is exceeding the minimum environmental flow of 15m3/s as required in the project EMP. TSHPC however has extended the studied area to 85km downstream from the dam reaching to Ba Thuoc 2 HPP to assess broader impacts of reservoir filling on other water users such as aquaculture, sand mining, and chopstick making enterprises.

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Figure 1-1 Location map showing Ma River Basin and project location

2 Methodology 2.1 Background The methodology used to conduct the assessment includes (i) information and data collection from various available documentation and sources, and site visits by the Bank’s consultant team and TSHPCo; (ii) technical discussions between TSHPCo, its design team, environmental and social team, supervision engineer and in consultations with the affected communities and local authorities; (iii) evaluation of the potential impacts; ESMP development and the requisite communication with stakeholders. The report includes an ESMP describing the plans of TSHPC and an account of the measures for stakeholder communication, management of anticipated impacts, and implementation of mitigation measures during the initial impoundment period with significantly reduced flows in Ma River. 2.2 Approach The report assessment of impacts comprises following elements: - Review of available project documentation including the project design, the initial ESIA, supplementary ESIA etc. - Identification and analysis of possible technical solutions enabling adequate environmental flow to the downstream during reservoir impoundment. - Provided the fact that none of the identified technical solutions are feasible and/or sufficiently meet the downstream flow requirements and that the downstream impacts are expected temporary and quickly recovered, a mitigation and management approach was considered consisting of an Environmental and Social Management Plan for Reservoir Impoundment to be implemented by TSHPCO during the reservoir impoundment. A preliminary assessment survey was jointly conducted by the TSHPC team and the Bank’s consultant during October 11-14 aiming to screen the potential environmental and social impacts during reservoir filling. The main activities included site visits and consultations with the downstream villages, commune authorities and provincial authority. The details on the areas and communities consulted are given in Annex 1. A following-up detailed survey was conducted by TSHPC covering an area from the dam site to Ba Thuoc 2 HPP from October 31 to November 17, 2016 to collect additional information and data and assessing the level of impacts.

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- Identification of key potential receptors (environmental VECs, ecosystem services, water sources, river-dependent livelihoods, agriculture and businesses) that could potentially be affected by the short term reduction of river flow, through consultations and site visits and evaluation of their potential effects on the receiving environment and people using the water resource. - Development of an Environmental and Social Management Plan for Reservoir Impoundment (Section 6 of this report) based on the identified potential and in consultation with affected communities, local authorities, technical experts, etc. for implementation by TSHPC. TSHPC set up an implementation team in charge of the plan implementation to ensure all proposed actions are properly implemented as scheduled.

3 Review of possible technical solutions It is expected the reservoir impoundment will start by the end of December 2016. In order to comply with the environmental flow during the impoundment, TSHPC have explored a range of technical solutions to ensure an environmental flow of minimum 15m3/s. The reservoir impoundment will interrupt the downstream flow for about 15-20 days depending on the incoming flow. As soon as the reservoir water level reach to 145 m, the downstream flow will be maintained by releasing water through the spillways (and power house if possible). The following technical solutions have been considered to release downstream flows when the water level is below 145 m. The technical solutions were evaluated based on technical, economic/financial parameters. a. Discharge through sluicing outlet (El.105.7m) It is expected that the water level will reach to elevation of the sluicing outlet bottom of 105.7 m in about 5 days since commencing of the reservoir impoundment. At this point, theoretically, the project would be able to release water through the sluicing outlet to meet the downstream flow. However, since the sluice gate is located above the diversion culverts it would be not technically feasible to discharge required water flow through the sluicing outlet during plugging work of the diversion culverts by concrete placement and grouting works which will take about three months. Instead, the project can discharge up to 0.7m3/s through 2 valves arranged at the stop log gates of the sluicing outlet. This technical solution will be implemented. b. Discharge through intake (El.133m) At the time of commencing the reservoir impoundment, installation of the generation units has not been fully completed thus it is impossible to discharge water through these units. c. Discharge through spillway When the reservoir water level reaches to the elevation of 145.0m, the environment flow can be discharged through the spillway chambers from No.1 to 4. The discharge flow would be equal to the inflow. This is feasible and fully works. However, it will take about 15-20 days for the water to reach this elevation and be discharged downstream. d. Construction of temporary structures (e.g. weirs, pools) on the Ma River and its tributaries: The Ma River is characterised with deep slops and complicated river bed conditions thus the construction of temporary structures on the river to provide sufficient environmental flow would be technically complicated, costly and not effective. Construction of such river structures would require lengthy Government approval processes on the technical design, land allocation, social and environmental impacts assessment, etc delaying reservoir impoundment by more than 12 months. It is also not practical and effective to build small temporary structures to rescue fish considering the poor resources of Ma river and the fact that trapped fish will all be caught by the local people once trapped in those pools. Monitoring and enforcing protection of fish in the pools would be challenging. Pump water from the reservoir:

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A number of high-technology pumps would be required due to the very high pumping head exceeding 50m and the required big discharge capacity of 15m3/s. TSHPC and the Bank team have discussed with various pump manufactures including, the world’s leading pump manufacturer. However, this option turned out to be almost infeasible particularly technical uncertainties under the rapidly changing reservoir water level condition. In addition to technical challenges, there are no such pumps available in Vietnam. The cost of the pumps would be about US$4 million plus shipping, installation and operation. Optimistically it would take 9-12 months to order and install the pumps to the project s site, which would substantially delay the project causing substantial economic losses as the country faces power shortages and the project is critical to contribute power supply to the national grid. f. Use of Siphon: The elevation difference between the upstream reservoir level and the crest of the spillway is a major restricting factor due to possible negative pressure and cavitation in the pipe, which would make the siphon operation not applicable for most period of the impoundment. Even if syphons are used to discharge the environment flow for a very short period, the design and construction of the flexible pipe system along with flange connection over the long steep terrain would also be time-consuming and costly, which would significantly delay the reservoir filling; therefore this option is not feasible. Please note that the reservoir rising rate is rather high from 90 masl to 145 masl with the rate of around 2.7-3.5 m/day. This operational condition along with the steep upstream and downstream site topography would make the installation of floating pump and siphon options more technically complicated, costly including design, site arrangement and installation. Conclusion: The technical assessment demonstrates that all of the identified technical solutions, except discharging to 0.7m3/s through 2 valves arranged at the stop log gates of the sluicing outlet, are technically challenging and its implementation would substantially deal the operation of the project causing substantial economic loss to Vietnam which is short on power. Equally important, the potential social and environment impacts caused by the reservoir impoundment are relatively minor and short term, with the river fully recovering once water flow resumes. To mitigate short and relatively minor impacts, TSHPC prepared an Environmental and Social Assessment and Management Plan (ESMP) for Reservoir Impoundment aiming to monitor, mitigate and manage the impacts at downstream of the dam. This will help the project being commercially operated as scheduled delivering more than 1 billion kWh renewable energy annually. It is also important to note that the river is not absolutely dried up during the reservoir impoundment but has water flow contributed by tributaries along the river as presented in the table below: Distance from Inflow Cumulative Name of tributary the dam (km) (m3/s) flow (m3/s) 0km Trung Son HPP 0.70 0.70 3km Stream Pạo 0.20 0.90 6km Stream Pó 0.20 1.10 8km Stream Nanh 3.15 4.25 10km Stream Quýt 0.50 4.75 11km Stream Pu 0.60 5.35 Stream Cải 0.30 5.65 Stream (unnamed) 0.30 5.95 Stream Quyên 0.10 6.05 Stream Ngờ 0.30 6.35 20km Stream Xia 5.00 11.35 Stream Pưng 5.00 16.35

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Stream (unnamed) 5.00 21.35 Stream Éo 0.30 21.65 Stream next to Hồi Xuân HPP 0.20 21.85 Stream Mướp 0.50 22.35 42.7km River Luồng 80.00 102.35 Stream Han Khó 1.00 103.35

4 Baseline information 4.1 Background The collection of baseline information was undertaken in the period 10-14 October 2016 and additional information on river flow was provided by TSHPC. Another round of data collection was carried out during October 31 to November 17, 2016. The site visits and surveys were conducted along the Ma river downstream from the TSHPP to the operating Ba Thuoc 2 HPP, which is approximately 80km downstream. During the site visits, all incoming streams and rivers were noted and a visual assessment of their flow estimated. All features potentially affected and water resource uses were also noted. In addition, other studies were made available for the assessment including “The Supplementary Environmental and Social Impact Assessment (SESIA) of the Trung Son Hydropower project, 2011”, “The Fish Biodiversity and Fisheries, 2008”, and “The Assessment of Impacts Caused by Trung Son Hydropower Project to Protected Areas and Terrestrial Biodiversity, 2008”. 4.2 Receptors 4.2.1 Introduction As with any assessment of riverine environments and social there are two categories of receptors, namely (i) the riverine ecosystem itself, and (2) the water resource usage dependent receptors. 4.2.2 Riverine ecosystem The river at the dam site is a quite deeply incised channel, relatively fast flowing, relatively flashy, due to its position in the upper catchment of Ma River basin, thus affected quite quickly by heavy rainfall in the surrounding hills. As part of the studies for the project, fish investigations were conducted that established that fish migration in the Ma River occurs mainly in the lower and middle segments of the river basin up to 100 km from the river mouth. The distance from the dam site to the river mouth is approximately 200 km. Significant, migration type movement of fish in the river section about 100 km of downstream of Trung Son is not prevalent. Therefore, impacts on fish are considered of low magnitude, particularly given the short duration of reduced flow and the fact that the fish species are adapted to low flows in the dry season. There are 1,873 species of plants that belong to 152 families in the TSHPP area. Vegetation cover within the TSHPP area contains mixed forest stands, which include broad leaf trees, bamboo, pine and grasslands. The natural forests in the TSHPP area have been significantly exploited for domestic and commercial activities. Vegetation in the reservoir and dam construction site and the Co Luong – Co Me road consists mainly of plantations of luong bamboo (Dendrocalamus membranaceus), other bamboo (Melia azedarach) and other planted trees with low biodiversity value. The project site is located near three protected areas, the Xuan Nha, Pu Hu and Hang Kia-Pa Co Nature Reserves. The protected areas lie ‘up current’ of the River in the surrounding higher lands and are thus not affected by the reservoir filling. Ma River generally has lower biodiversity levels when compared with other rivers in Vietnam due to strong fluctuations between much reduced flows in the dry season, and heavy flooding

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in the wet season. Nine of the 198 fish species are listed in the Vietnam Red Data Book. However, none of the species recorded in the Vietnam Red Book appear in the Red List of the International Union for the Conservation of Nature (IUCN) 2006 because they are all widely distributed in rivers of North and North-Central Vietnam. It should be noted that Ma River is heavily modified regarding water quality. There are two main types of pollutants present, the first being high silt content, the second a combination of sewage and industrial waste water. High silt content is caused by soil erosion in the river’s catchment area, which is aggravated and accelerated by deforestation, swidden agriculture and construction activities. Sewage and other liquid waste enters the river from the adjacent settlements, for which it serves as the main / only collector of liquid waste. Notably, another HPP is under construction about 9 km downstream of TSHPP, which is directly impacting 2 km of river banks on both sides additionally contributing to sediment and pollutant loads in Ma River. 4.2.3 Resource users The identification and collection of information on the communities and families that use the water resource of the River Ma was primarily based on field observations and consultations with the various local authorities, and the Provincial Authorities in Thanh Hoa through meetings on the 14th October. The types of resource users identified are as follows: - Chopstick manufacture / paper processing - Aquaculture through caged stock - Sand mining in the river channel / bed margins - Transport of bamboo and people by boat up and down the river - Agricultural irrigation from river abstraction - Abstraction for potable supply, river margin communities - Crossing by boat of people including schoolchildren - Irrigation and livestock watering 5 Assessment of potential effects 5.1 Changes in river flow during reservoir filling During the study a lot of consideration was given to predict what exactly would happen to the river flow; its general ecology; and from a social perspective, what implications there were for the people using the water resource in the Ma river. According to the hydrological calculation, the duration of the river closure until the dam initially fills could be around 20 days, which is based on the multi-year average river flows recorded at the hydro-meteorological stations in Ma River areas. The diagram below describes the changes in Ma river flow during reservoir impoundment, which is expected in December 2016 between the downstream river sections from the time of diversion culverts’ closure at t=0, to 0.5 days after reservoir filling at t=0.5, and 15 days after the river closure at t=19. The time expected for the water release to downstream through the spillways is 20.5 days. The total downstream distance considered is 42.7km to Luong river confluence. The calculation is based on the average hydrological data in December for many years recorded at the hydro-meteorological stations in Ma River areas.

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Figure 5-1 Residual Flow during reservoir initial impoundment Trung Son Hydropower Plant: 3 - t=0, Qo=129 m /s - t=0.5 days; Q=0 m3/s (0%) - t=19 days; Q= 0 m3/s (0%) - t= 20.5 days; Q= 129 m3/s (100%)

20Km

Co Lương (Xia Stream) 3 - t=0, Qo=134.0 m /s (100%) Xia Stream - t=0.5 days; Q=5.0 m3/s (3.88%) - t=19 days; Q= 5.0 m3/s (3.88 %) - t= 20.5 days; Q= 134.0 m3/s (100%)

` 22,7 Km

Downstream of Luong river 3 - t=0, Qo=162.0 m /s (100%) Luong River - t=0.5 days; Q=33.0 m3/s (25.58%) - t=19 days; Q=33.0 m3/s (25.58%) - t= 20,5 days; Q= 162.0 m3/s (100%)

As can be seen in the diagram, the flow of the Ma would be halted and reduced to zero, leaving only the streams that inflow into the river channel available as residual flow. In addition to the main tributaries depicted in Figure 4-1, numerous small streams are entering Ma River that cumulatively contribute significantly to environmental flows. The results of a screening survey are provided in table 5.1 and annex 4. Table 5-1 River/Stream discharge estimates down to Ba Thuoc 2. Volume Name of Distance Left Right N Unit (Nov 4, stream/river (from TSHPP dam) bank bank 2016) Trung Son HPP 0km 1 Stream Pạo m3/s 0.2 3km x 2 Stream Pó m3/s 0.2 6km x 3 Stream Nanh m3/s 3.15 8km x 4 Stream Quýt m3/s 0.5 10km x 5 Stream Pu m3/s 0.6 11km x 6 Stream Cải m3/s 0.3 x Stream 7 m3/s 0.3 x (unnamed) 8 Stream Quyên m3/s 0.1 x 9 Stream Ngờ m3/s 0.3 x 10 Stream Xia m3/s 5 20km x 11 Stream Pưng m3/s 5 x Stream 12 m3/s 5 x (unnamed) 13 Stream Éo m3/s 0.3 x

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Stream next to 14 m3/s 0.2 x Hồi Xuân HPP 15 Stream Mướp m3/s 0.5 x 16 River Luồng m3/s 80 42.7km x 17 Stream Han Khó m3/s 1 x 18 River Lò m3/s 40 x Bá Thước HPP2 m3/s SUM m3/s 142.7 5.2 Potential effects In order to preliminarily identify downstream impacts during reservoir impoundment, social and environmental experts conducted consultation meetings with representatives of Thanh Hoa Provincial People’s Committee (PC), PCs of districts, communes, villages downstream of the hydropower plant and other hydropower plants from October 11 to 14, 2016 spreading over a distance of about 80km from Trung Son hydropower dam downward to Ba Thuoc 2 hydropower plant. Consultation activities were done at 2 hydropower companies of Hoi Xuan and Ba Thuoc 2 and at 47 villages, 17 communes, 3 districts, 2 provinces from Trung Son commune, Quan Hoa district, Thanh Hoa province to Thiet Ke commune, Ba Thuoc district, Thanh Hoa province – (See Annex 1 for details) and representatives from local authorities at district level (Divisions of Natural Resources and Environment and Divisions of Agriculture of Quan Hoa district, Ba Thoc district), at provincial level (Department of Natural Resources and Environment and Department of Agriculture of Thanh Hoa province.) These consultations aimed at identifying and assessing social and environmental impacts and communication needs of the communities, affected people during the impoundment. During this consultation phase, the following potential issues were identified: i) Impact on people who need to cross Ma River. ii) Impact on aquaculture. iii) Impact on sand mining. iv) Impact on small enterprises (processing luong bamboo for making chopsticks and inputs materials for paper mills). v) Impact downstream hydropower plants. vi) Impact on transportation on the Ma River. vii) Impact due to landslides viii) Impacts on the river and riverine ecosystem. From the environmental flow perspective, the impacts downstream largely depend on the level of the flow during the reservoir impoundment. The following magnitude of impacts have been considered for the three sections of Ma river after the dam: - Severe impact: The river section of 20km from Trung Son hydropower dam to Xia stream (Co Luong Bridge). This section will experience significantly reduced flow during the reservoir impoundment. - Medium impact: The river section of about 22.7km from Xia stream to the Luong River confluence with Ma river. - Small impact: The river section of about 45km from the Luong River confluence to Ba Thuoc 2 hydropower plant. The detailed results of the surveys, consultations, and downstream impact assessment during water reservoir filling are consolidated in this section for three distinct river sections. The detailed survey reveals only two main potential issues - aquaculture and waterway traffic across the river. The impacts on other issues including sand mining, small enterprises, downstream hydropower plants, waterway transportation, and river bank landslides, identified during the

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preliminary consultation appear to be not affected or only slightly affected. The detailed analysis of the impacts is given in the sections below. 5.2.1. Impact on people who need to cross Ma River Given the limited accessibility in the studied area, local people often use paid small boat service (operated by a local person) to cross the river. They are school children from kindergarten to 9th grade and workers living along the right riverbank of the four communes of Trung Thanh, Phu Thanh, Thanh Xuan, and Hoi Xuan who need to cross the river to go to schools and work. For the school children, if they travel by road, it will take 4-12km (depending on each village and school position). Alternative routes will require travel over degraded dirt and gravel roads, some of which are very difficult to travel, sometimes impassable even for motorbikes. Alternative travel arrangements will require households to use motorized transport, mainly motorbikes, to take their children to school. During the plugging of the diversion channels and release of water through the spillway, the impacts may include: i) difficulty in accessing the boat due to exposure of the mudded river bed as a result of significantly reduced flow; ii) inability to use the boat due to the low water level preventing the boat from operation; and iii) sudden substantial increase in water level and flow velocity due to release water through the spillway – post reservoir filling. The magnitude of this impact correlates with the distance from the crossing point to the dam site. In the survey done by TSHPCo, there are totally 12 river crossing points identified from km 22nd to km 45th from the dam site. There are four bridges downstream of the dam at the distances of 2.5km, 11.5km, 26.5km, and 31.5km, respectively. 5.2.2. Impact on aquaculture and fishing A number of households are growing fishes (carp, and mud carp, common carp, bagarius) in cages along Ma river, especially in the communes of Quan Hoa district. Site specific survey and consultation indicated the below detailed impacts.

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Number of Number of fish- Communes AHs cages Van Mai (Mai Chau district) 4 10 Thanh Son (Quan Hoa district) 1 7 Phu Thanh (Quan Hoa district) 7 15 Phu Xuan (Quan Hoa district) 1 5 Quan Hoa Town (Quan Hoa district) 12 45 Xuan Phu (Quan Hoa district) 3 9 45km from the Luong River confluence to Ba Thuoc 2 HPP 37 107 Total 65 198 The table shows that 65 HHs with 198 fish-cages might be affected during the reservoir filling period. Depending on the water level, three scenarios might happen to them, including (i) no impact if the water level is sufficient; (ii) moving the cages to area with deeper water level; (iii) temporarily suspension (for 2 weeks) of aquaculture activities due to low water level (less than 1m) and increased water pollution. The potential impacts associated to projected scenario is presented in below table.

Projected scenarios Potential Impacts The water level is sufficient No anticipated impact (i) Time/labor for moving cages; (iii) The water level is reduced and HH have to Unexpected loss of fishes during the move cages to area with deeper water level relocation The water level is significantly reduced and (i) Loss of daily income during the HH have to temporarily suspend aquaculture suspension period; (ii) Early selling of fishes; activities due to low water level (less than (ii) Loss of young seedling; 1m) and increased water pollution. 5.2.3. Impact on sand mining Sand mining operations use river water for suction dredging of sand onto a barge or directly onto the river bank, as well as for transport to stockpiling areas. Thus, if river water levels recede significantly, mining becomes impossible. There are 42 sand mining locations along the river section from the dam site to Ba Thuoc 2 HPP. Many of these small businesses are licensed land miners, while some of them operate on an illegal basis. Inability to operate during the reservoir impoundment may disrupt their normal business for about three weeks, and finally affecting their income during this period. 5.2.4. Impact on small bamboo processing enterprises Small bamboo processing enterprises process bamboo for making chopsticks and raw materials for paper mills. Some river water is used for daily production, mostly for moistening the left over after chopstick production, the bamboo shavings, before transporting to paper mills. The reduced water level may pose difficulties for them in getting water from the river. There are 26 small bamboo processing enterprises located on the left bank along the river section from the dam site to Ba Thuoc 2 HPP. 5.2.5. Impact downstream hydropower plants For hydropower projects under construction such as Thanh Son, Hoi Xuan, Ba Thuoc 1, the impacts are negligible or even positive during reservoir filling as the reduced water level and flow would facilitate construction of these hydropower plants. However, sudden release of water

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with a strong flow may have adverse impacts on the coffer dam of this HPP. For Ba Thuoc 2 HPP, which is 80 km downstream of TSHPP, hydrological calculations indicate that the remaining flow rates would fulfil the requirements for normal operation of Ba Thuoc 2 HPP. All the downstream HPPs, both under construction and in operation, will be informed in a timely manner to allow adjusting construction and operation modalities of the plants. 5.2.6. Impact on transportation on the Ma River Some households in 8 communes including: Trung Son, Thanh Son, Trung Thanh, Phu Thanh, Thanh Xuan Hoi Xuan, Xuan Phu and Thiet Ke use the river to transport bamboo and agricultural products from the right riverside to the left riverside for sale, or transport along and across the river to the gathering place. The volume of bamboo transportation is often small because the households have a habit that when they need the money, they will exploit a sufficient amount for selling. The significantly reduced river water level will make these households unable to transport their products across or along the river. On the other hand, sudden release of a large volume of water, if happen, may pose unexpected safety risks the river transportation. 5.2.7. Impact due to landslides About 7 households living along the river banks about 3km downstream of the dam are located in landslide prone areas. While the lowering of water levels is unlikely to increase the risk of landslides for these households (because the riversides are dry and thus more stable), recovering water levels with high flow rates could potentially cause instabilities, resulting in landslides and consequences of asset loss and human safety risks. 5.2.8. Impacts on the river and riverine ecosystem Impact on Fish Migration and Habitats During project preparation, a comprehensive impact assessment of TSHPP on fish biodiversity and fisheries mitigation measures for the project area of influence was completed in 2008 (Impact Assessment of Trung Son Hydropower Project on Fish Biodiversity and Fisheries and Proposed Mitigation Measures). The study confirmed 198 species of fish, among which 9 species have been listed in Vietnam Red data book in 2007, including 1 species is of CR class (highly endangered), 1 species of EN class (endangered), and 7 species of VU class (vulnerable). The area upstream of the dam has 4 VU species, and all 9 species occur in lowland area downstream of the dam. None of these species appeared in Red List of IUCN 2006. All the species are widely distributed in the rivers of the North and Northern Central Vietnam, some species found in the rivers of the middle central of Vietnam. Of these 9 fish species, the five species found in downstream from the TSHPP dam to Luong river confluence with Ma river are Anguilla marmorata, Elopichthys bambusa, Senilabeo lemassoni, Hemibarbus guttatus, and Bagarius rutilus. The other four species found downstream of the Luong confluence are Clupanodon thrissa, Konosirus punctatus, Tor (Folifer) brevifilis, and Bostrichthys sinensis. The 2008 fish study found 12 economic species, two species of which, Hemibarbus guttatus and Bagarius rutilus have been considered local economic fish with relatively good production even though they have been mentioned in Vietnam Data Red Book 2007. The other ten species, which are not listed in the Red Book, were Hemiculter leucisculus, Cyprinus carpio, Cranoglanis sinensis, Mastacembelus armatus, Silurus asotus, Clarias fuscus, Cirrhina molitorella, Spinibarbus denticulatus, S. hollandi, Onychostoma gerlachi. The reservoir impoundment will have adverse impacts on fish, especially those migrate up and downstream through the dam site. The diversion channel plugging will act as impassable barriers to longitudinal migration along the river. Longitudinal connectivity is crucial because fish and mobile invertebrates use longitudinal migration to access spawning and nursery grounds, to move to deep water refuge areas when river levels fall, and as part of life-history migrations that are integral to the life cycles of many species. The fish migration pattern and distribution of the nine conservation fish species and 12 economic species are described below:

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- Anguilla marmorata migrates to sea for spawning, distributing in post-dam area, and thus it is expected that the dam will not block their spawning migration routes. As reported by the fishers, this species is available but very rare in the project area. - Elopichthys bambusa is distributed in upstream (pre-dam and post-dam) and midstream areas. Its spawning floodplain is in midstream (Vietnam Data Red Book 2007), the dam would not affect its spawning. - Senilabeo lemassoni is distributed in upstream, both pre-dam and post-dam areas (Nguyen Huu Duc & Duong Quang Ngoc, 2003). They seem to find spawn in the post- dam area. - Hemibarbus guttatus is distributed largely in upstream, midstream and downstream of Ma River (Nguyen Huu Duc & Duong Quang Ngoc, 2003). Spawning locations are in the midstream and upstream (Vietnam data Red Book, 2007), they spawn in post-dam area. - Clupanodon thrissa migrates into the river for spawning. Its spawning area in the Ma River is in Ba Thuoc, 50 km downstream from the dam, so the dam would does not block its migration routes. - Konosirus punctatus also migrates into the river for spawning. Its spawning sites in Ma River have still not yet determined. However, it is only found in downstream areas (Duong Quang Ngoc, 2007), and thus the dam will not block its migration paths. - Tor (Folifer) brevifilis is found in the midstream of Ma River (Nguyen Huu Duc & Duong Quang Ngoc, 2003). Its spawning sites have not been determined. The only information known is that they spawn in accelerated flow with bed of stone, gravel (Vietnam Red Data Book 2007). If place of their breeding is above the dam, they may be able to breed in tributary of Luong river where has the same ecological condition. - Bostrichthys sinensis is only distributed in river mouth and coastal area (Vietnam Data Red Book, 2007). - Bagarius rutilus is distributed throughout the upstream, midstream, and downstream of Ma River (Nguyen Huu Duc & Duong Quang Ngoc, 2003). Spawning locations are in the midstream and upstream (Vietnam Data Red Book, 2007), so they will spawn in post- dam area. - Of the 10 other economic freshwater fish, Hemiculter leucisculus spawns in flowing water but does not migrate; Cyprinus carpio spawns in many floodplains along river in upstream and midstream; Cranoglanis sinensis spawns in scattered caves along the river; Mastacembelus armatus spawns in shore caves and does not migrate; Silurus asotus and Clarias fuscus spawn on nearshore mud beds; Cirrhina molitorella spawns in upstream and midstream with on nearshore mud beds; Cirrhina molitorella spawns in upstream and midstream with whirlpool (Nguyen Tan Trinh & NNK, 1996). All of these species spawn in post-dam area; Spinibarbus denticulatus spawns in small catchments; S. hollandi and Onychostoma gerlachi spawn in accelerated flow with sand and gravel bed (Nguyen Tan Trinh & al., 1996). The fifty-six species of fish that live in brackish and salty waters migrate up Ma River (Duong Quang Ngoc, 2007). However, none of them is hampered by the dam because the longest species migration is that of Lates calcarifer which has a migration limit still 70km downstream from the dam. It is know that 4 species of fish, Anguilla marmorata, Lates calcarifer, Mugil cephalus, and Therapon jarbua live in the river but migrate to the sea. However, these 4 species are allocated in lowlands of the dam, therefore, dam is not a barrier of their migration. The study noted that the water flow pattern is also an important aspect with regard to fish migration. For many species it is the first flow increase in the beginning of the rainy season that triggers the migration. In addition, almost all juvenile and mature species appear in the beginning of rainy season. Since the reservoir impoundment will commence end December, which is in the dry season, it is not expected that there will be adverse impact on fish migration and juvenile which would be vulnerable to significant reduced flows.

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During project implementation a comprehensive monitoring program has been put in place to design and implement a rigorous survey for monitoring the current status of fish communities as well as activities of fisheries in the Ma River system during the period of under construction and operation of the hydropower project, leading to valuation of likely impacts of the Trung Son Hydropower project development, then to produce related protective measurements of the fish biodiversity and fisheries. The monitoring events are conducted in the rainy and dry seasons. Four monitoring missions were completed for the rainy and dry seasons in 2015 and 2016. The monitoring sites are indicated in Figure 5-1. The findings from the monitoring consistently identified presence of the two species of conservation value in the project areas, i.e., Bagarius rutilus and Hemibagrus guttatus listed in Vietnam’s Red Data Book (VU level), and 14 were of economic value as apposed to the nine species of conservation and 45 species of economic value identified in 2008. The results of the monitoring events are summarized below: Monitoring in the rainy season 2015 (September 21-30, and October 5-7, 2015) A total of 397 specimens belonging to 59 species were collected at 14 monitoring sites during the rainy season survey in 2015. - Among the 9 species with value of conservation in the monitoring area, only two species were captured during this field trip, Bagarius rutilus with 30 individuals at three locations before the dam, 2 locations from the dam to Luong river, and three locations after Luong River. Hemibagrus guttatus were identified with 2 individuals, one before the dam and another after Luong river. - Also, among the 41 economic species in the monitoring area, 14 were collected with distribution from head water to the lowland area. Monitoring in the 2015 dry season (November 21-29, and December 1-4, 2015) A total of 166 specimens belonging to 35 species were collected at 10 monitoring sites during the dry season survey in 2015. There were four stations without any fish, i.e., three stations below the dam and a control station in Buoi River. - Among the nine species with value of conservation in the monitoring area, only two species were captured during this field trip, Bagarius rutilus with eight individuals and Hemibagrus guttatus with ten individuals. Bagarius rutilus had a wide distribution that was collected at five stations, three before the dam and two monitoring stations after the dam. Hemibagrus guttatus was collected only at one site - Co Luong, after the dam with 10 individuals. - Among the 35 economic species in the monitoring area, only 5 were collected during this field trip: Bagarius rutilus, 7 individuals, at five sites; Cyprinus carpio, 3 individuals, at two sites; Hemibagrus guttatus, 10 individuals at one site; Hemiculter leucisculus, 08 individuals, at three sites and Mastacembelus armatus, 01 individual. These freshwater species were distributed from head water to the lowland area, but not at the estuary area with brackish water. Monitoring in the 2016 dry season (April 20-29, 2016) A total of 511 specimens belonging to 60 species were collected at 14 monitoring sites during the dry season survey in 2016. - Among the nine species with value of conservation in the monitoring area, only two species were captured during this field trip, Bagarius rutilus with three individuals and Hemibagrus guttatus with two individuals. Bagarius rutilus was collected at two stations, one are located in the highland, above the dam and one in middle land of the Ma River, below the dam. Hemibagrus guttatus was collected both before and after the dam. - Among the 35 economic species in the monitoring area, 16 were collected during this field trip along all the range from headwater the lowland area.

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Monitoring in the 2016 rainy season (September 16-30) A total of 355 specimens belonging to 35 species were collected at 14 monitoring sites during the rainy season survey in 2016. - Among the nine species with value of conservation in the monitoring area, only two species were captured during this field trip, Bagarius rutilus with 23 individuals and Hemibagrus guttatus with 8 individuals. Bagarius rutilus was collected at 8 stations, 4 located in the highland, above the dam, the middle Ma River below the dam. Hemibagrus guttatus was collected at 6 sites, all of them are located on the Ma River. Four sites are located in the highland, above the dam and 2 in middle land of the Ma River, below the dam. - Among the 35 economic species in the monitoring area, 6 were collected during this field trip from the highland, before the dam, and after the dam. The findings of the 2008 studies and the results of the monitoring indicate that there are no endemic species of conservation or economic value in the area downstream of the dam. The potential effects on fish populations is difficult to establish. The Ma river does have a reasonably high fish diversity, but values are higher downstream towards the river mouth, where brackish species are encountered and are of importance. The stretch of river in question lies well upstream of migrating fish and is considered to have a relatively high disturbance from existing and under-construction hydropower plants. For example, the Ba Thuoc 2 HPP scheme (operational since 2012) was visited during the study and no fish passes or other measures were observed, meaning that the stretch of river affected could already be considered to be under impact in terms of migration. Furthermore, the natural seasonal river fluctuations will mean that fish species are generally adapted to moving up and down stream in reaction to changes in flows. During plugging of the diversion channels for reservoir impoundment, it is expected that relatively rapid decreases in the river flow could adversely affect aquatic resources. It is anticipated that water would recede in the river stretch from the dam site to the Luong river confluence faster than what would occur naturally. The potential effects can include fish standing in shallow, low-gradient areas and off-channel habitat (resulting in immediate or delayed mortality); temporary loss of habitat or loss of habitats access; and dewatering of fish redds, amphibians, aquatic insects, and plant life. The rapid reduced flow in the river can also affect fish behavior which could reduce survival growth. The faster the reduction in water surface elevation, the more likely fish and other aquatic organisms are to be stranded or adversely affected. No specific literature was found that might give categorical answers to the effects of flow reduction over a 2-3 week period. Quantitative assessments of stranded fish are difficult in field studies. An experiment (Sarah A. Cocherell et. al, 2012) conducted to assess such lateral displacement and stranding on juvenile stream fishes found that fish-stranding rates of 8%, which were comparable to those observed in past investigations using larger, artificial streams. In general, it is expected that fish will gradually move downstream with reducing flows at the dam site and return following release of water after impoundment. If flows reduce rapidly, there is always the possibility that numbers of fish can become stranded in deeper sections and pools and could be killed after drying of these features or caught by local people. However, the level of adverse impacts will depend on the residual flows along the stretches of Ma river downstream as described in more details below:  Section Km0- Km8 downstream of the dam: For the first 7 days of reservoir filling, there is no residual flow along the 3km of the river immediately after the dam. Further down to Km8, the total residual flows from the two small tributary streams vary between 0.2 – 0.4m3/s. The impacts on fish and other aquatic communities in this section of the river will be severe, including significant temporary loss of habitat, reduced dissolved oxygen in water, and possible entrapment in the pools along

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the river due to discontinued flow and subsequent consequence of being caught by the local people, and part of the population may indeed perish during the filling period. It is most likely that fish in this river section (i) migrates downstream into the next HPP’s reservoir during low flow period; (ii) survive in interconnected pools in the riverbed, that are fed by the residual flow; (iii) migrate into tributaries; (iv) entrapment in isolated pools and eventual death. After about a week, when the water level in the reservoir would reach the elevation of the sluicing outlet bottom of 105.7m, a total discharge of about 1.4m3/s will be discharged through the two valves at the stop log gates of the sluicing outlet.  Section Km8- Km20: Due to the contributing flows of the streams along the two sides of the river, the flow will increase from 3.6m3/s to 5.6m3/s. Another 1.4m3/s through the sluicing outlet is expected to be added up after one week from the start of water filling. The risks exposed to by the aquatic species would still be expected high and similar to the section immediately after the dam, but with some improvement in the level of dissolved oxygen due to more contributing stream flow.  Section Km20- Km43 to the Luong river confluence: At Km 20, the river will receive a flow of 5m3/s from Xia stream, adding up a total flow of 11.6m3/s. The cumulative flow at this section will be from 11.6m3/s to 22.6m3/s where the Luong river confluences with the Ma river. Taking into account additional 1.4m3/s, the impacts on the riverine ecosystem in this section of the river are expected to be moderate.  Section Km43 to Ba Thuoc 2 HPP: With Luong river contributing 80m3/s to Ma river at Km43 and the cumulative residual flow of 22.6m3/s making a total of 102.6m3/s, the river flow is much more that the required minimum environmental flow of 15m3/s. The water flow should be enough for sustaining the aquatic ecosystem during the reservoir impoundment period. The potential effects of fish standing in shallow, low-gradient areas and off-channel habitat is not expected. Temporary loss of habitat or loss of habitats access are anticipated to be small. Therefore, the impact on the aquatic species is assessed as small. The overall impacts on aquatic ecosystem of the river during the reservoir impoundment, therefore, will be significant. However, in the medium to long term, the impacts are expected to be low given the capacity of the river for natural attenuation and ecological rebound. One of the factors contributing to this assessment are the many tributaries, which, while small, will function as biodiversity pools and support quick repopulation of the river with the original species.

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Figure 5-1. Map of sampling sites for ecological investigation and water condition measurement (14 sites, 1-4 and 7-16) as well as fisheries (5 sites, 3-5, 7-8)

21 CeREC.Org.vn | Centre for Resources, Environment and Climate Change

Impact on riverine terrestrial ecosystem TSHPP has adverse impacts on the three Natural Protected Areas (NPA) of Pu Hu, Xuan Nha, and Hang Kia Pa Co (Figure 5-3, bottom left). Part of Pu Hu NPA is located near Ma River downstream of the dam with the closest proximity of about a kilometre to the river. The forests in this area are NPA buffer zone riparian forests which consist of exhausted natural forests and bamboo plantation. The Natural forests have been severely exploited for many decades, thus converting into exhausted forests, scrublands and grasslands. The vegetation along the river is characterized by following types (Figure 5-2): i) Mixed bamboo-tree forest; ii) Scrubland; and iii) Grassland.

Figure 5-2. Typical vegetation along the Ma river In spite of being serevely degraded, this riparian forests still supports diversity of invertebrate animal species. Few vertebrate species occur in this habitats in very low density such as rodents, some bird species, lizards, snakes, frogs, etc. No threatened species were found in this habitat. Thus, this reparian forest contain low biodiversity values, however, it is important for supporting aquactic fauna in the Ma river through providing food soures (invertebrates, fruits, leaves, ect.) and preventing water pollution by river shore erosion. During project implementation a research on presence and conservation of the Indochinese tiger (Panthera tigris corbetti) was conducted. The findings of the study confirmed that no evidences of the presence of Tiger in three reserves were recorded. A program for monitoring impacts on rare species in Pu Hu and Xuan Nha natural reserves have also been put in place and being implemented. The last monitoring report found no evidence of impacts related to the river water drinking habits of the rare species in Pu Hu NPA. Terrestrial fauna living near the river stretch may have to change their feeding grounds and other living activities. However, given the short duration of flow reduction and the natural seasonal fluctuations in river flow in the Ma catchment, it is considered that potential adverse impacts to the riverine terrestrial ecosystems, especially those directly adjacent to the river, will be minor, particularly given the high modification (e.g. bamboo plantation) and disturbance that already occurs along, and impacts the river margins.

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Figure 5-3. Area of project activities

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All the identified impacts and sensitive receptors are summarized in Table 5-2 below. Table 5-2. Summary of impacts and receptors during reservoir filling period (up to 3 weeks)

20km from Trung Son 20km from Xia 45km from the Impact Category hydropower dam to Xia stream to the Luong River stream (Co Luong Luong River confluence to Ba Bridge) confluence Thuoc 2 HPP Impact on people who Not found 7 river crossing 5 river crossing need to cross Ma River points points Impact on aquaculture 05 households engaged 23 households 37 households in aquaculture with 17 engaged in engaged in fish cages aquaculture with 81 aquaculture with fish cages 107 fish cages Impact on sand mining Three small sand mining 27 sand mining 12 sand mining households located on locations. locations this section Impact on small Not found 10 small bamboo 16 small bamboo enterprises processing processing enterprises enterprises Impact downstream Thanh Son HPP under Not found Ba Thuoc 2 HPP hydropower plants construction Impact on Only few households use Some households Some households transportation on the the river to transport use the river to use the river to Ma River bamboo and agricultural transport bamboo transport bamboo products and agricultural and agricultural products products Risk of landslide on 7 households living along Not found Not found river bank the left river bank located in landslide prone areas. Impacts on the river River aquatic ecosystem River aquatic River aquatic and riverine ecosystem ecosystem ecosystem Level of impact Significant: No to Medium: Flow Small: Flow volume significant reduced flow volume will be will be increased increased with the with the confluence confluence with Xia with Luong river. stream.

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6 Environmental and Social Management Plan (ESMP) This section provides an account of the effects and their mitigation and management, through an ESMP, essentially implemented by TSHPC during initial reservoir impoundment. As part of the overall evaluation of potential impacts and their mitigation and management, it was agreed that the ESMP implementation will be weekly reported to the Bank during the reservoir impoundment. 6.1 Management of reservoir area TSHPC established Steering committee for reservoir impoundment who in charge of Technical, safety during filling period (total 23 persons); The Steering committee will inform people in the reservoir area about impoundment schedule and also supervise the erosion and landslide in the reservoir area. (the detail of staffing and responsibilities of Steering committee in the annex 4).

For debris accumulation, TSHPC already installed debris net and trash bucket in the intake area to collecting the floating debris.

TSHPC will monitor the water quality of reservoir 1 time/ 3 months during operation phase for colour, smell, taste, pH, DO, COD, BOD, DO, total N, total P, oil, TSS, coliform.

6.2 Approach and measures for mitigate downstream impacts TSHPC will assume responsibility for mitigating all downstream impacts caused by reservoir impoundment. Management of environment and social impacts is carried out in an adaptive manner which means suitable actions shall be taken depending on actual specific impacts. The mitigation measures include technical solutions, site-specific mitigation measures, communication, and compensation measures. In order to address impacts causes, TSHPC shall throughout the filling period conduct the following mitigation measures: - Continuous discharge through 2 valves arranged at the stop log gates of the sluicing outlet, of 1.4m3/s. - Implement site-specific mitigation measures, including compensation, and communication plan to inform local communities and authorities at various levels about diversion culvert closing time and expected time until resumption of water discharge. This action shall be conducted 15 days prior to diversion culvert closure (See section 3 of communication plan for details). - TSHPC shall cooperate with local authority at district level (Site Clearance Council) to identify prepare and implement a compensation plan. - Send TSHPC’s staff to the affected communes and especially to the locations with much travel on either sides of the Ma River to take adaptive actions and manage the impacts during water re-discharge.

Site-specific mitigation measures are described in details in Table 6-1 below:

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Table 6-1. Site-specific mitigation measures during reservoir filling and water release

Site-specific 20km from Trung Son HP dam to Xia 22.7km from Xia stream to the Luong 45km from the Luong River confluence to impacts stream River confluence with Ma river Ba Thuoc 2 HPP Impact on - No river crossing points at this river stretch, - TSHPC to communicate with the local - TSHPC to communicate with the local people who and therefore, no mitigation measures authorities and the affected people on the authorities and the affected people on the need to cross required. Nevertheless, TSHPC will inform timing of water filling and release 10 days timing of water filling and release 10 days Ma River the local authorities and the communities of before start of the reservoir impoundment, before start of the reservoir impoundment, timing of water filling and release 10 days and consult with them on the alternatives and and consult with them on the alternatives and before start of the reservoir impoundment. measures which include: i) provide measures which include: i) provide alternative road transportation support to the alternative road transportation support to the destination and back; ii) provide destination and back; ii) provide transportation to the nearest bridges at transportation to the nearest bridges; iii) send Km26.5 and Km31.5 from the dam site; iii) staff to the 5 crossing points to directly assist send staff to the 7 crossing points to directly river crossing such as providing safe access assist river crossing such as providing safe on the muddy river bed to the boats at the two access on the muddy river bed to the boats sides of the river and assist people and at the two sides of the river and assist people schools children get on and off the boats; iv) and schools children get on and off the boats; establish and implement a rigorous warning iv) establish and implement a rigorous and monitoring system connecting these 5 warning and monitoring system connecting locations to the monitoring system at the dam these 7 locations to the monitoring system at site for any unexpected safety risks during the dam site for any unexpected safety risks the diversion channel plugging and water during the diversion channel plugging and release through the spillway; and v) gradually water release through the spillway; and v) release water through the spillway. gradually release water through the spillway. Impact on - TSHPC to communicate with the local - TSHPC to communicate with the local - TSHPC to communicate with the local aquaculture authorities, the Site Clearance Council of authorities, the Site Clearance Council of authorities, the Site Clearance Council of Quan Hoa district, and the 05 affected Quan Hoa district, and the 10 affected Quan Hoa district, and the 37 affected households on the timing of water filling and households on the timing of water filling and households on the timing of water filling and release 10 days before start of the reservoir release 10 days before start of the reservoir release 10 days before start of the reservoir impoundment, and consult with them on the impoundment, and consult with them on the impoundment, and consult with them on the alternatives and measures which include: alternatives and measures which include: alternatives and measures which include: o Prepare Minutes of Agreement on support o Prepare Minutes of Agreement on support o Prepare Minutes of Agreement on support solutions to serve as basis for approval solutions to serve as basis for approval solutions to serve as basis for approval and payment prior to impoundment and payment prior to impoundment and payment prior to impoundment

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o Complete and Agree with AHs on the o Complete and Agree with AHs on the o Complete and Agree with AHs on the inventories exercise for all affected cages, inventories exercise for all affected cages, inventories exercise for all affected cages, including information such as type of fish, including information such as type of fish, including information such as type of fish, age, growing time, market price etc – age, growing time, market price etc – age, growing time, market price etc – these will be the baseline for these will be the baseline for these will be the baseline for compensation calculation if needed. compensation calculation if needed. compensation calculation if needed. o Support in moving cages to area with o Support in moving cages to area with o Closely monitor the water level (via onsite deeper water level deeper water level assigned staff) and provision additional o Support in selling the fish o Closely monitor the water level (via onsite support as needed (support in moving cages to area with deeper water level; o Compensate for the dead and young fish assigned staff) and provision additional support as needed (support in selling the Support in selling the fish) o Complete all the mitigation measures fish; compensation for the dead and before reservoir filling young fish) o Complete all the mitigation measures before reservoir filling Impact on - TSHPC to inform the three affected sand - TSHPC to inform the 27 affected sand mining - TSHPC to inform the 12 affected sand mining sand mining mining businesses of the timing of water businesses of the timing of water filling and businesses of the timing of water filling and filling and release 10 days before start of the release 10 days before start of the reservoir release 10 days before start of the reservoir reservoir impoundment. impoundment. impoundment. - Advise these small enterprises on stockpiling - Advise these small enterprises on stockpiling - Advise these small enterprises on stockpiling of sand in reserve to meet the market of sand in reserve to meet the market of sand in reserve to meet the market demand during the water filling period. demand during the water filling period. demand during the water filling period. - Immediately inform them of the water release - Immediately inform them of the water release - Immediately inform them of the water release for their restoring of sand mining activities. for their restoring of sand mining activities. for their restoring of sand mining activities. Impact on - No bamboo processing enterprises located - TSHPC to inform the 10 affected bamboo Given the additional water flow of the Luong small at this section, and hence, no mitigation processing enterprises of the timing of water river and the other residual flow, it is not enterprises measures required filling and release 10 days before start of the expected that the 16 bamboo processing reservoir impoundment. enterprises located along this river stretch will - Advise these small enterprises on stockpiling be affected. of the products in reserve to meet the market - TSHPC to inform the 16 affected bamboo demand during the water filling period. processing enterprises of the timing of water - Provide the enterprises with alternative water filling and release 10 days before start of the sources such as connection to mountain reservoir impoundment. spring water, provision of water wells in the - Advise these small enterprises on stockpiling river bed, or longer pipe connection to reach of the products in reserve to meet the market the water at lower water level in the river. demand during the water filling period.

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- Immediately inform them of the water release - Provide the enterprises with alternative water for their restoring of river water use. sources such as connection to mountain spring water, provision of water wells in the river bed, or longer pipe connection to reach the water at lower water level in the river. - Immediately inform them of the water release for their restoring of river water use. Impact - TSHPC to inform the Thanh Son HPP of the - No HPPs located at this section, and thus, no - TSHPC to inform the Ba Thuoc 2 HPP of the downstream timing of water filling and release 10 days mitigation measures required. timing of water filling and release 10 days hydropower before start of the reservoir impoundment. before start of the reservoir impoundment. plants Impact on - TSHPC to inform the local authorities and the - TSHPC to inform the local authorities and the - With Luong river contributing 80m3/s to Ma transportation affected communities of timing of water filling affected communities of timing of water filling river at Km43 and the cumulative residual on the Ma and release 10 days before start of the and release 10 days before start of the flow of 22.6m3/s making a total of 102.6m3/s, River reservoir impoundment. reservoir impoundment. it is unlikely that the transportation of bamboo - Provide the community with the information - Provide the community with the information on this stretch of Ma river would be affected. on the alternative road transport routes such on the alternative road transport routes such - Nevertheless, TSHPC to inform the local us through Co Me bridge (2.5km after the us through bridges at the locations of Km26.5 authorities and the affected communities of dam) and Ban Trieng bridge (11.5km after and Km31.5 after the dam. timing of water filling and release 10 days the dam). before start of the reservoir impoundment. Risk of - TSHPC will inform the local authorities and - No houses are at risks of landslides at this - No houses are at risks of landslides at this landslide on the 7 households communities of timing of section, and thus, no mitigation measures section, and thus, no mitigation measures river bank water filling and release 10 days before start required. Nevertheless, TSHPC will inform required. Nevertheless, TSHPC will inform of the reservoir impoundment. the local authorities and the communities of the local authorities and the communities of - Immediately after notification of reservoir timing of water filling and release 10 days timing of water filling and release 10 days filling, TSHPC to send technical staff this site before start of the reservoir impoundment. before start of the reservoir impoundment. to consult with the affected households, identify the risks of landslides in details, and develop an emergency plan if necessary. Impacts on the - TSHPC to work with local fishermen to implement the following mitigation measures: i) - With the significant contributing flow of Luong river and construction of small weirs and connection channels to maximize remaining interconnected River and the residual flow at this point riverine water bodies in river bed; ii) “salvage fishing” in isolated pools to economically utilize fish stock, downward the river, the potential effects of ecosystem and minimize water pollution by decaying fish by hygienic removal and disposal of the dead fish standing in shallow, low-gradient areas fish in landfill; iii) coordinate with the local authorities and police to ensure that that the fish and off-channel habitat is not expected. trapped in small pools will not be caught by local people; iv) mobilize TSHPC staff and Temporary loss of habitat or loss of habitats access are anticipated to be small.

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volunteers such as high school children and local people to rescue the fish for releasing Therefore, no mitigation measures are downstream of Luong river confluence. required. - TSHPC to re-mobilize the ecology / fisheries consultants involved in preceding studies to monitor the reservoir filling period, record impacts, also observe reinstatement of flows and ecosystem recovery. The consultant will also conduct a short fish rescue training for the TSHPC staff and volunteers. - After the filling is completed and the river is back to only slightly modified flow patterns (as experienced during normal reservoir operations), TSHPC to produce a short, technical “post mortem” report, assessing the actual impacts incurred during the filling period with a well- researched, factual analysis of what actually happened.

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6.3 Communications Communications will be an important tool to ensure the mitigation plan is implemented effectively achieving the objectives. TSHPCo will be responsible for the communication as described below: - Results of consultations and detailed impact assessment of the potentially effected stakeholders showed that timely, accurate and sufficient provision of information about impoundment time and duration, complaint receiving channel to affected stakeholders plays an important role in timely response and impact mitigation. - Communication will play a key role to deal with downstream impacts during the reservoir impoundment, by delivering precise, timely information about impoundment time, informing on measures people can take themselves, and about the range of assistance from TSHPCo . - TSHPCo will cooperate with local authorities at district, commune and village levels along the river downstream to, through these authorities, liaise and communicate with affected stakeholders to gain their understanding and obtain their cooperation to overcome difficulties by themselves during the impoundment. For impacts that cannot be overcome by themselves, the project and local authorities shall jointly assist solving. Communications Strategy: The communication strategy’s objective is to ensure proactive, timely, accurate and sufficient provision of information to downstream communities and other key stakeholders about the reservoir filling of TSHPCo, warning on possible interruption of the activities using Ma river and warning on the possible accidents. It will also help strengthen two-way communication through a hotline to address queries and complaints in a timely manner1.  Village Authorities (Heads of Villages) will be the center of communication activities. The key stakeholder is local people/villagers at the defined affected villages including households running manufacturing operations, aquaculture etc.  Head of the defined affected villages (HV) will take care of the main part of communication toward local people with support from Trung Son, including the following activities: o Arrange meeting with villagers o Inform schools located in the village o Distribute leaflet o Put up posters o Loudspeaker communications o Get feedbacks from villagers  TSHPCo will provide heads of villages with information, leaflets, and any necessary supports and be in regular contact with heads of villages to get feedbacks.  TSHPCo will set up a hotline. TSHPCo will submit the ESMP to MONRE and DONREs of Thanh Hoa and Hoa Binh provinces.  TSHPCo will reach out to and brief the focal point of the Vietnam Rivers Network on the progress of the project and impoundment schedule.  TSHPCo will regularly update information on reservoir filling on its website and will closely monitoring media report and social media

1 All of the proposed activities except the last one have been implemented by TSHPCo. 28

Detailed communication plan is provided in annex 2 6.4 Staffing and resource TSHPCo sets up a downstream monitoring team in charge of implementation and monitoring of the mitigation plan during the impoundment. The team comprise of 18 technical, safeguard and communication experts and led by Mr. Đặng Ngọc Triệu, TSHPCo Deputy Director. List of the team members and responsibility of each member are provided in annex 3. This team will work in 8 communes with boat wharfs to both monitor and assist. - This group is expected to include 8 people working in communes during the impoundment (15 days prior to the impoundment, during impoundment (10-20 days) and after impoundment (3 days). - This group will be equipped with cameras to record changes in daily river flow. They will take notes of reports and complaints due to impacts caused by impoundment and be responsible for assistance and for timely taking solutions. - Communication Unit of TSHPC, which consists of 5 staff, will lead implementation of the communication activities and reporting during reservoir filling. 6.5 Implementation arrangement - Section from Trung Son – Co Luong (20km): The residual flows are expected to be most significantly reduced in this section, thus 3 monitoring points shall be arranged for this section to monitor changes and assess impact degree of the impoundment o Pao village boat wharf (Trung Son commune): Mr Nguyen Hong Phuong o Tang village boat wharf (Thanh Son commune): Mr Tran Quoc Hung o Choi village boat wharf (Van Mai): Mr Vu Hoang Dung - River section from Co Luong to Hoi Xuan Hydropower (20km): Due to contributions from tributaries such as Xia, Pu, Po, Pao, Quyen, Cai streams, flow rates are likely augmented by 3,8 % but there are 04 locations existing boat wharfs. TSHPCo intents to arrange 04 monitoring points: o Phu Thanh commune boat wharf: Mr Dang Quoc Quang o Phu Xuan commune boat wharf: Mr Nguyen Hoai Giang o Thanh Xuan commune boat wharf: Mr Tran Van Manh o Hoi Xuan commune boat wharf: Mr Nguyen Ngoc Nam - River section from Hoi Xuan district town to Ba Thuoc 2 hydropower (45km): This river section is downstream the Luong River, Lo River confluence with Ma River, which adds a significant volume of water (25.5%), thus only 01 monitoring point is arranged at Thiet Ke commune: o Thiet Ke commune boat wharf: Mr Pham Tien Dung - Monitoring is constantly conducted from 01 day prior to impoundment, during impoundment (about 10-20 days) and 03 days after impoundment. 6.6 Reporting TSHPCo will produce detailed documentation of all activities relating to mitigation, compensation, assistance and monitoring during the impoundment. Report contents and frequency are detailed in the below table.

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Purpose and content of Reporting Receiver Responsibilities Report type report frequency of report Within 24 TSHPC, Collect information of Report on hours since local accidents or unexpected accident/incident the incident authorities, incidents happens WB Visually describe changes in water level at 8 positions where monitoring points are Every TSHPC arranged downstream of Thursday Monitoring Weekly Report Trung Son hydropower before 16h00 WB team during dam (photos are through email reservoir filling attached) or telephone Impacts caused by the impoundment recorded by TSHPCo and solutions Summary Report on the Right after impoundment process completion of Final Report on TSHPC, and mitigation measures the Impoundment WB taken during the impoundment impoundment

6.7 Estimated cost for implementation of ESMP

Estimated No Measures Quantity Unit price cost (USD)

1 Impacts on fishing and aquaculture Van Mai (Mai Chau district) 10 150 US/ cage 1.500 Thanh Son (Quan Hoa district) 7 150 US/ cage 1.050 Phu Thanh (Quan Hoa district) 15 150 US/ cage 2.250 Phu Xuan (Quan Hoa district) 5 150 US/ cage 750 Quan Hoa Town (Quan Hoa 150 US/ cage 6.750 district) 45 Xuan Phu (Quan Hoa district) 9 150 US/ cage 1.350 45km from the Luong River 150 US/ cage 16.050 confluence to Ba Thuoc 2 HPP 107 Total for fish cages 198 29,700 2 Communication Support for head of villages to organize meetings, , distributing leaflet, putting up 48 posters, loudspeaker 200 US/village 9600 villages communicating, providing hotline, getting feedback from villagers Print Posters 400 1 US 400 Print leaflets 3000 0,1 US 300 Stationery (pens, note book lump 200 US 200 tapes…) sump 30

Total for communication 10.500 3 Unanticipated problems 100,000 (landslides…) Total 140,200 Note: Maximum estimated is 150 US/cage to support for owner to move the fish cage or implement other mitigations. The final amount of payment will in agreement with affected households and certified by local authorities

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References Assessment of impacts caused by Trung Son Hydropower Project on the natural protected areas and terrestrial biodiversity. 2008. Duc NH (2008) Impact assessment of Trung Son Hydropower project on Fish-biodiversity. Duc NH, Ngọc DQ, Thuy TT & Hao NV (2003) Fish Composition in Ma river of Thanh Hoa province. Proceeding National conference in life sciences. Science & technology Publishing House, Hanoi: 69-72. Duc NH & al. (2008) Survey Results and Analysis Data of Fish Biodibersity and Fishseries. Vietnam Electricity Group Trung Son Hydroelectric Project Management Unit. Ngoc DQ (2007) Contribution to study Ichthyofauna of Ma river of Vietnam territory. Dotoral thesis. Research and Conservation Assessment of Indochinese tiger (Panthera tigris corbetti), 2016. Sarah A. Cocherell, Stephanie N. Chun, Dennis E. Cocherell, Lisa C. ThompsonEmail author, A. Peter Klimley, Joseph J. CechJr. A lateral-displacement flume for fish behavior and stranding studies during simulated pulsed flows. Environmental Biology of Fishes. January 2012, Volume 93, Issue 1, pp 143–150. Supplementary Environmental and Social Impact Assessment (SESIA) of the Trung Son Hydropower project, 2011. Trịnh NT & al. (1996) Vietnam Aquatic Resources, Agriculture of publishing House, Hanoi. 596 pp.

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Annex 1: Local authorities and communities consulted

Ethnic groups

Left Right Thai Mong Muong No. Location bank bank group group group A Thanh Hoa province I Quan Hoa district 1 Trung Son commune 1 Co Me village x x 2 Chieng village x x x 3 Pao village x x 4 Po village x x 2 Thanh Son commune 5 Son Thanh village x x x 6 Nam Thanh village x x x 7 Chieng Yen village x x x 8 Thanh Tan village x x x 9 Tan Huong village x x x 3 Trung Thanh commune 10 Say village x x x 11 Chieng village x x x 12 Tang village x x x 13 Phai village x x x Mai Chau district 4 Van Mai commune 14 Nam Đien x x 15 Thanh Mai x x 16 Don x x 5 Mai Hich commune 17 Choi village x x Quan Hoa district 6 Phu Thanh commune 18 Uon village x x 19 En village x x 20 Pang village x x 7 Phu Le commune 21 Sai village x x 8 Phu Xuan commune 22 Chom Mo village x x 23 Chom Mi village x x 24 Trang village x x 9 Xã Phú Sơn 25 Bản Chiềng x x 10 Thanh Xuan commune 26 Vui village x x 27 Eo village x x 27 Xa Lang village x x 28 Tan Son village x x 29 Gia village x x 11 Xã Hồi Xuân 30 Muop village x x 31 Chom Coc village x x 32 Kham village 12 Hoi Xuan district town 33 Block 1 x x 34 Block 2 x x 35 Block 3 x x

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Ethnic groups

Left Right Thai Mong Muong No. Location bank bank group group group 36 Block 4 x x 37 Block 5 x x 38 Block 7 x x 13 Nam Xuan commune 39 But village 14 Phu Nghiem commune 40 Co Me x x 41 Đong tam x x 15 Xuan Phu commune 42 Coi village x x 43 Cham village x x 44 Cang village x x 45 Khuou village x x BA THUOC DISTRICT 16 Ban Con commune 46 Lang Ca village x x 17 Thiet Ke commume 47 Ke village x x 48 Chay Ke village x x District: 03 districts Quan Hoa, Mai Chau; Ba Thuoc Commune: 17 communes Village: 48 village Local Authorities 1 Thanh Hoa province Thanh Hoa DONRE Thanh Hoa MARD 2 Ba Thuoc district Ba Thuoc Division of Nature Resources and Environment Ba Thuoc Division of

Agriculture 3 Quan Hoa district Quan Hoa Division of Nature Resources and Environment Quan Hoa Division of

Agriculture

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Annex 2: Reservoir Filling Communications Plan Background: To prepare for the reservoir impoundment, a Bank communication team conducted a downstream assessment missions in October 2016 and to prepare a communication plan. The team visited 3 districts, 17 communes, 48 villages, met with representatives of Thanh Hoa province authorities and interviewed about 50 local peoples. According to the assessment and evaluation from Trung Son HP Co, the impacted areas is defined from the dam to the intersection with Lo river, is estimated 60 km from the dam. After that point, the impact of the reservoir is negligible due the significant contribution of the flows from Luong and Lo rivers to Ma river. The defined impacted area includes the following communes: Trung Son, Thanh Son, Trung Thanh (Quan Hoa district), Van Mai, Mai Hich (Mai Chau district), Phu Thanh, Phu Le, Phu Xuan, Phu Son, Thanh Xuan, Hoi Xuan (Quan Hoa district). These communes are the main targeted audience of the communication plan. Since the project preparation, Trung Son project has built a strong and open relationship with key local NGO network – the Vietnam Rivers Network though its focal point organization, Green ID. Continuous engagement with Green ID has been be maintained through the construction phase. Objectives: The communications plan aims at ensuring a proactive, timely, accurate and sufficient provision of information to downstream communities and other key stakeholders about the potential impact of the impoundment, the impoundment time duration and associated mitigation measures. The communication activities will help TSHPCo to gain understanding and acceptance from the affected communities and help strengthen two-way communication through a hotline to address queries and complaints in a timely manner. Key messages of Communication Plan:  Explain what is reservoir filling  Explain what happens during the reservoir filling? What people should be aware of and be cautious of?  Time: when it starts? How long it will last? When the water will start to discharge? Key Audience and Target Groups of Communication Plan:  Group 1: Local authorities (affected provinces, districts and communes)  Group 2: Local people (local villagers, local manufacturing and aquaculture households)  Group 3: Schools (teachers, students, parents)  Group 4: Owners of sand mining operations, other downstream hydro power projects Channels for Communication Plan: The channels are official letter, meetings, a telephone hotline and black and white printed leaflet. Communication Plan Approach: Communication activities will be carried out through local authorities and village heads. Staff from Trung Son HP and the Bank will join some information sessions/meetings organized by local authorities and village heads, and provide close monitoring throughout the process. This approach will make the communication more effective and efficient as the messages are cascaded down from authorities of district and commune to villagers. A Bank communication consultant will be present and work closely with Trung Son communication focal person before and during the reservoir filling period. The Bank’s senior communication expert will supervise the overall implementation of the plan. Communication Plan Timeframe: Communication activities should be carried out regularly and throughout the reservoir filling period. There are two crucial dates that require special attention from communication point of view: (i) the start of the reservoir filling and (2) discharge of water.

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Detailed Communication Activities

Stakeholders Channel Activities Time

LOCAL AUTHORITIES Official letter Trung Son to send the official letter to the 15 days People Committee (PC) of Thanh Hoa and Son before La districts; and PC of the affected communes to inform of the reservoir filling and ask for support. Letter/telephone Trung Son to inform when water discharge, 5 5 days, 3 days before and repeat 3 days, 1 days before days, 1 day before LOCAL PEOPLE via Heads of Heads of villages to take a main part of 14 days (including fishing and Villagers communication toward villagers including: before aquaculture, (meeting, leaflet, Arranging the meeting with villagers, distributing chopstick poster, leaflet, putting up posters, loudspeaker manufacturing loudspeaker, communicating, providing hotline, getting households etc..) hotline) feedback from villagers Trung Son to provide information, leaflet, poster, 15 days and necessary supports to heads of villager before

Trung Son to follow up with heads of villagers Regularly and check with the villagers to make sure the communications activities implemented and get feedback from villagers. Telephone Trung Son to inform heads of villagers the day 5 days, 3 water discharge and ask heads of villages to days, 1 day inform to the villagers 5 days before and repeat before 3 days, 1 days before LOCAL Letter, leaflet, Trung Son to send official letters to these 15 days ORGANISATIONS hotline organizations together with leaflet. before (schools, companies such as hydropower Trung Son to follow up to ensure the Regularly projects, sand communications implemented mining) letter/email/ Trung Son to inform when water discharge, 5 5 days, 3 telephone days before and repeat 3 days, 1 days before days, 1 day before All stakeholders Hotline Trung Son to set up a hotline. Questions and Regularly responses should be recorded.

Local NGOs Meeting Trung Son and World Bank will brief the focal at public point of the Vietnam Rivers Network disclosure of ESMP and ESIA TRUNG SON STAFF Crisis Refresh all staff of Trung Son HP Co with the Asap management crisis management handbook handbook

MASS AUDIENCE Website Upload information on the reservoir filling on Regularly Trung Son website Media, social Monitoring media and social media: _Set up Regularly medial search engine /media listening tools and a person in charge to monitor all the news, comments from media, social media regarding reservoir filling, dam of TS Abbreviations: TS: Trung Son HP Co.; CT: TS Communications Team; CC: Communications Consultant; HV: Head of village

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Annex 3: Monitoring team TSHPCo management Title Responsibility 1 Đặng Ngọc Triệu TSHPCo Deputy Director Overall responsibility Direct in charge of daily 3 Hoàng Ngọc Hiển PMB deputy Director implementation Head of Social and In charge of monitoring and 4 Nguyễn Trường Chinh Environmental Dept. support team Deputy head of technical 5 Nguyễn Tiến Thưởng department Support in technical issues Monitoring and support ( 7 persons) 6 Trần Quốc Hùng Expert Monitoring and support team 7 Nguyễn Ngọc Nam Expert Monitoring and support team 8 Nguyễn Hồng Phương Expert Monitoring and support team 9 Đặng Quốc Quang Expert Monitoring and support team 10 Phạm Tiến Dũng Expert Monitoring and support team 11 Lỷ Trung Sinh Expert Monitoring and support team 12 Nguyễn Hoài Giang Expert Monitoring and support team 13 Nguyễn Văn Thiện Expert Monitoring and support team Communication ( 4 persons) 14 Trần Tuấn Nam TSHPCo Deputy Director In charge of communication 15 Vũ Hoàng Dũng Communication expert Communication team 16 Phạm Văn An Communication expert Communication team 17 Trần Văn Mạnh Communication expert Communication team 18 Hồ Tuấn Nam Communication expert Communication team

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Annex 4: Steering committee for reservoir impoundment

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Annex 5: Small streams downstream

Stream Downstream view Upstream view characteristics 1) Pao stream

- 3km after TSHP dam - Width (W): 1m - Depth (D): 20cm - Velocity (V): 1m/s - Flow (Q): 0.2m3/s

2) Tho stream - 4km after the dam - Q: 0.001m3/s

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3) Po stream - 6km after the dam - W: 1m - D: 20cm - V: 1m/s - Q: 0.2m3/s

4) Nanh stream (right bank) - 8km after the dam - W: 3m - D: 70cm - V: 1.5m/s

3 - Q: 3.15m /s

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5) Pu stream - 11km after the dam - W: 2m - D: 20cm - V: 1.5m/s - Q: 0.6m3/s

6) Xia stream - 24km after the dam - W: 5 - D: 50cm - V: 2m/s - Q: 5m3/s

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