Greater Colombo Wastewater Management Project

Environmental Monitoring Report

Project No.36173-013 Period Covering January to June 2019 August 2019

Sri Lanka: Greater Colombo Wastewater Management Project

Prepared by the Colombo Municipal Council, Ministry of Local Government and Provincial Council for the Asian Development Bank.

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

GREATER COLOMBO WASTEWATER MANAGEMENT PROJECT (GCWMP) - COLOMBO MUNICIPAL COUNCIL (CMC) COMPONENT

Environmental Monitoring Report – 2019(1)

For the period of 01.01.2019 to 30.06.2019

A summary report on Environmental Monitoring of the GCWMP for the period of 01.01.2019 – 30.06.2019

TABLE OF CONTENTS

1. INTRODUCTION ...... 5 1.1. Project Description ...... 5 1.2. Environmental Monitoring Mechanism ...... 8 2. SPECIFIC ENVIRONMENTAL SAFEGUARD ISSUES ...... 10 3. COMPLIANCE STATUS OF SUB PROJECTS ...... 12 3.1. Rehabilitation of Sea Outfall: ...... 12 3.2. Upgrading of Wanathamulla Gravity sewer networks: ...... 12 3.3. Rehabilitation of Gravity Sewers...... 12 3.4. Rehabilitation of Pumping Stations and Pumping Mains: ...... 21 4. Photographs ...... 40

TABLE OF FIGURES

Figure 1. Location of project sites ...... 7 Figure 2. Institutional arrangement for the implementation of the project ...... 8 Figure 3. Mosquito control options recommended at site ...... 24 Figure 4. Larvicide samples used at site ...... 25 Figure 5. Fumigation at site ...... 25 Figure 6. Awareness posters to dengue prevention at sites...... 26 Figure 7. Ground water quality measurements by nbro conducted at borella-ps project influential area 27 Figure 8. Baseline ambient air quality measurement conducted by nbro at borella-ps ...... 27 Figure 9. Baseline noise quality measurement conducted by nbro at borella-ps ...... 28 Figure 10. Baseline vibration measurements conducted by nbro at borella-ps ...... 28 Figure 11. Waste collection containers at vystwyke-ps ...... 29 Figure 12. Rock particles extracted from bedrock ...... 29 Figure 13. Properties subjected to crack survey in borella-pumping station ...... 30 Figure 14. Tree plantation program ...... 31 Figure 15. Daily pep-talk conducted at wanathamulla-ps ...... 32 Figure 16. Pep talks provided for the workmen at borella-ps ...... 32 Figure 17. Ehs training provided for the office staff at l&t office ...... 33 Figure 18. Ehs-safe execution engineering (see) training for staff ...... 33 Figure 19. Ehs safety month celebrations to improve the safety culture among workmen at borella-ps . 40 Figure 20. Inauguration of ehs-safe execution engineering training at borella-ps ...... 40 Figure 21. Ehs-health checkup conducted for the workmen ...... 41 Figure 22. Ehs-pep talk conducted for the workmen for the night work at malligawatte-ps ...... 41 Figure 23. Ehs-onsite training conducted for the workmen at borella-ps ...... 41 Figure 24. Ehs- induction training conducted for the workmen at slave island -ps ...... 41 Figure 25. Ehs awareness quiz program conducted for contractor staff ...... 41 Figure 26. Health checkup for workers ...... 41 Figure 27. Ehs executive walkdown conducted to ensure ehs implementations at site ...... 41 Figure 28. Ehs-pep talk conducted for the workmen at wanathamulla-ps ...... 41 Figure 29. Fumigation conducted to manage mosquito at bambalapitiya-ps ...... 41 Figure 30. Ehs- safety month inauguration session at borella-ps ...... 41

LIST OF TABLES

Table 1. Ongoing construction sub projects ...... 6 Table 2. Environmental monitoring and reporting arrangement ...... 9 Table 3. Specific environmental safeguard issues ...... 10 Table 4.details about gravity sewer project ...... 12 Table 5. Environmental action plan for the gravity sewer sub project...... 14 Table 6. Environmental monitoring plan and compliance status ...... 17 Table 7. Details of the pumping station project ...... 21 Table 8. Major activities of pumping station ...... 22 Table 9. Environmental action plan for pumping station sub project ...... 35 Table 10. Environmental monitoring plan and compliance status ...... 37

1. INTRODUCTION

1.1. Project Description The wastewater disposal system of Colombo was first built in 1906-1916 and extended and rebuilt in the 1980s and 1990s.The system comprises of gravity and pumped collection systems; Northern and Southern that discharges all wastewater, untreated, to the Indian Ocean through two long sea outfalls at Wellawatte and Mutwal. For various reasons the system has lost its intended operational capacity and thus, the whole system requires significant rehabilitation to restore its performance and allow expansion to underserved areas. The government of Sri Lanka has received a loan from ADB to execute the Greater Colombo Wastewater Management Project to rehabilitate the selected critical components of the system. Accordingly the project has implemented with an estimated cost of USD116.5 million out of USD100 million is funded by ADB while Sri Lankan government financing the balance amount. The project become effective in April 2009 and planned to be completed by end of December 2020.

Ministry of Internal & Home affairs and Provincial Councils & Local Government is the executing agency of the project while Colombo Municipal Council (CMC) and National Water Supply and drainage board (NWSDB) has been working as the project implementing agencies.

The overall objective of the Greater Colombo Wastewater Management Project (GCWMP) is to improve the urban environment by securing improved sanitation services for the people of Colombo by upgrading sewerage infrastructure, and strengthening the institutional, operational, and project management capacity of the wastewater service provider.

The project has the following three components:

Component 1: Upgrading Sewerage infrastructure. This is the main civil works component of the project and consists of contract packages as follows.

1. Rehabilitation of Sea outfalls: Design, supply of equipment and construction of rehabilitation of 2 marine outfalls in Mutwal and Wellawatte. – The contract, for this sub Project component, was awarded to Leader Civil Guaugzhou Salvage Joint Venture. The letter of acceptance was sent on 03.05.2013 and the completion date was 19.05.2015. The contract was completed as planned and it is handed over to CMC who is the owner of the asset. No more monitoring is done by the PMU as it is operated by CMC.

2. Upgrading of Wanathamulla Gravity Sewer Network: Supply of equipment and construction of gravity sewers including new sewer pipe line laying to expand the catchment, relocation of the sewer to public road, changes to the sewer alignment, construction and cleaning existing manholes, modification to the sewer network and conducting CCTV survey of sewers. The contract, for this sub project component has been awarded to M/S Vonlan constructions (Pvt) Ltd. The letter of acceptance was issued on 20.12.2013. Lately the contract was terminated by a decision made by National steering committee meeting due to the delay and some other issues of the contractor and advertised the balanced work with CS19 sewer rehabilitation project. After reviewing the received bid TEC report submitted to CAPC not recommending the bidder.

3. Rehabilitation of Gravity Sewers: Supply of equipment and construction of gravity sewers and force mains including replacement of critical sewers of under capacity and 5

refurbishment of existing gravity sewers and force mains by replacement of non- operational control valves and conducting CCTV survey of sewers. The contract, for this sub Project component, has been awarded to TEACLY (S) PTE LTD, Singapore. The letter of Acceptance was issued on 13.05.2014. 98.53% of the physical works are as of 30.06.2019.

4. Rehabilitation of Pumping Stations and Pumping Mains: Design supply of equipment, construction of civil, mechanical electrical works associated with rehabilitation of 10 existing pumping stations and construction of 01 new pumping station in CMC service area and laying 02 pumping mains. The contract, for this sub Project component, has been awarded to Larsen and Toubro Limited, India. The letter of Acceptance was issued on 30.07.2015 and the effective date of the contract is 01.09.2015. 58.03% of the physical works are completed as of 30.06.2019.

5. Rehabilitation of sewer lines in CS19 and Wanathamulla area for Colombo Municipal Council: A fresh contract is being formulated combining balance works of Wanathamulla gravity sewer contract and the repair works of CS 19 sewer line which connects whole north catchment to the land-based chamber to the Mutuwal sea outfall. The condition assessment carried out under component-1 has revealed that the line is heavily corroded at several places and need immediate repair. It has been decided to give up this component as there is no any potential contractor is selected and decided to consider in future funding.

6. Supply of Operational Equipment: This sub component provides operational equipment to assist CMC to carry out O & M tasks.

Component 2: Strengthening Institutional and Operational Capacity: This component includes the following tasks. Asset management planning and operations, Financial Management, Operational and Monitoring capacity, Environmental Compliance, customer service and public awareness and Pro-poor and Gender-Inclusive sanitation services. All these tasks were carried out under Institutional Development Consultants.

Component 3: Project Management and implementation support: This component is supporting the project management and implementation including incremental administration and operations associated with the project management unit (PMU).

The table 1 below summarizes the ongoing construction sub projects.

Table 1. Ongoing construction sub projects

No Sub project Contractor Overall progress as of 30.06.2019 01 Rehabilitation of Gravity sewers Teacly (S) Pvt Limited, 98.53 % Singapore 02 Rehabilitation of Pumping Larson and Toubro Limited, 58.03 % Stations and Pumping Mains India

Figure 1. Location of Project Sites

1.2. Environmental Monitoring Mechanism

The proposed project falls within Category B of the ADB’s environmental classification of projects. Accordingly, Initial Environmental Examination (IEE) report has been prepared and approved by the ADB. Since the project is to rehabilitate the existing sewer system, it does not require approval from Central Environmental Authority. In addition the Lanka Hydraulic Institute (LHI), with the financial assistance of ADB, evaluated quantitatively the effects of rehabilitation of the outfall using mathematical model simulation and it revealed that the rehabilitation of sea outfalls will significantly improve the ambient marine water quality and thus, minimize the threat of primary and secondary contact in beaches for recreational and fishing activities.

The institutional mechanism for ensuring the proper implementation of environmental safeguards will be directly coming under the purview of the Engineer to respective contract. The Engineer with the assistance of the Design, Supervision and Management Consultants (DSC) and the Project Management Unit (PMU) will carry out supervision and monitoring of compliance with the Environmental Management Plan (EMP), Environmental Management Implementation Plan (EMIP), Health and Safety Plan (H&SP), Emergency Response Plan (ERP) and the environmental effects of each sub project. In keeping with standard practice the Engineer will report to the National Steering Committee (NSE) of the project regarding environmental performance on a regular basis. A detailed report based on Site Specific Environment Monitoring Systems (SESMS) will be submitted biannually to ADB. The institutional arrangement for project implementation is as follows.

Figure 2. Institutional Arrangement for the implementation of the Project

The details of Implementation, Monitoring and Reporting responsibility for environmental management at the site level are as follows.

Table 2. Environmental Monitoring and Reporting Arrangement

Areas of monitoring Responsible Monitoring Frequency Reporting Overall implementation of Environmental Supervision / Internal Monthly to Project Officer / team Daily EMIP /internal Monitoring (Contractor) Audit Director Monitoring of Environmental Monthly / As As necessary to implementation of Project Director Occupational Health and Officer / PMU Compliance Audit necessary Safety Measures Biannually to ADB

Monitoring of EMIP Environmental Monthly / As As necessary to safeguard measures Officer / PMU Compliance Audit necessary Project Director Biannually to ADB

Public Relations Supervision /Internal As necessary to Public Relations Daily Project Director /complaint handling and Officer / audit Monthly / As monitoring Contractor, necessary Biannually to ADB PMU Ad hoc audit Effects monitoring Noise monitoring Contractor (Noise Level) As necessary

By Sound level meters Effects monitoring As necessary to Dust monitoring Contractor (Dust Level) As necessary Project Director

Physical observation Biannually to ADB Effects monitoring (cracks) Impacts on structures Contractor As necessary Pre and Post crack surveys

2. SPECIFIC ENVIRONMENTAL SAFEGUARD ISSUES

The sites are frequently monitored by PMU to monitor the compliance of environmental safeguard. Any non - compliances are observed they are notified to the Site Manager or Project Manager of the contractor immediately. A correction to the non-compliance is sought immediately to rectify and the contractor are instructed to find permanent solution to the issue to comply the safeguard requirement. The post compliance are confirmed by physical observation or through contacting the site supervision team of PMU in a week time. Table 02 below summarise the issues.

Table 3. Specific Environmental Safeguard issues

Sub Project Site Issues Correction Corrective action Post Compliance Gravity Sewer Contract Insufficient protection at voids in Provide adequate Steel plates were placed on top of 05/03/2019 M26 manhole cover slab has led the Temporary Cover to close satisfactory voids in the manhole cover workers lives in danger the voids Immediately covered the stock to ABC stock kept near road exposed to Cover the stocks to avoid avoid any air contamination and 17/05/2019 M26 external environment causing health the exposure to external satisfactory proceeded material transportation to issues to the public environment. the site based on the requirement. Avoid collection of water Damaged plastic road barriers caused inside the plastic barriers Arrangements were done to avoid water to infiltrate and collect inside. 17/06/2019 M26 and frequent monitoring of collection of water inside the plastic satisfactory This can be act as breeding ground for damaged barriers specially barriers and monitoring is being done. mosquitos. during rainy period Shaft perimeter not barricaded Barricade the shaft Constructed safety fence from GI pipes 13/03/2019 R1 properly threatens to the safety of perimeter with proper satisfactory and steel net wrapped around. the employees supports water pumped out of the shaft left Connected the dewatering line to a silt Improve drainage drained along the road causing trap and directed the water by a 05/04/2019 R1 arrangement and water satisfactory disturbance to the public rubber horse up to a storm water quality outlet

Pumping Stations Contract Inadequate cover provided at void Cover the void areas Covered the void areas immediately 18/06/2019 CS3 areas of the main structure causing immediately after the satisfactory with barriers and minimize the risk employees to falling from heights. construction Rainwater collected at some Possible preventive Dewatered the collected water at excavated areas resulting water to measures such as 18/06/2019 excavation pit and completed the satisfactory stagnate. This can be act as breeding dewatering the excavated activity and reinstated ground for mosquitos. areas frequently Sub-contractor has left the site Remove unnecessary Removed the water on the equipment without collecting his equipment & /unused equipment and covered with Tarpaulin until the 15/04/2019 Vystwyke machinery leaving places to water immediately from the site satisfactory equipment and machinery were stagnation. This can be act as breeding and avoid collection of removed from site. ground for mosquitos. water Immediately clean the Bathroom sanitary equipment are not equipment and adopt a plan Bathroom was cleaned and in a 09/05/2019 cleaned properly leaving health risk to satisfactory to clean the bathroom position for use the users frequently

3. COMPLIANCE STATUS OF SUB PROJECTS

3.1. Rehabilitation of Sea Outfall: The total civil works of the project is completed satisfactorily within the stipulated time and it is handed over to the CMC. The land-based outfall access chamber of Mutuwal site was raised and improved. A new outfall section along with diffuser section was constructed using HDPE pipes with concrete anchors offsetting the damaged section of the outfall (Mutuwal). Further mid-sea access points (Man-Holes) for both outfall lines were constructed. The whole lines were cleaned and all accumulated grit and sediments were removed. No complaints were recorded from any stakeholders during or after the execution of the contract.

3.2. Upgrading of Wanathamulla Gravity sewer networks: The contract was terminated after having completed 65% of the original scope and there is a balance of around 240 m of pipe laying and its associated construction works. The balance works were incorporated with CS 19 formulating a new contract as described as 5th contract package under component 1 in section 1.1.

3.3. Rehabilitation of Gravity Sewers

A. Sites under this Package Table 4.Details about Gravity Sewer Project

Date of Planned Physical Financial Details Status award completion progress Progress Contractor: Sewer construction Teacly(s) Pvt. Ltd through trench-less 03/05/2014 31/12/2019 98.53% 94.51% Contract amount: technique and open USD35.51 mil cut in-progress

There are five major components in the project as A1,M26,T1,U1,U3,CFM9 and R1.Out of them Rehabilitation works of U1 and U3 were complete and handed over to the CMC while rehabilitation works of M26 and R1 are under progress. CCTV based conditional assessment of 125km length of pipes are also in progress.

B. Activities carried out during reporting period

Major Activities

∗ Shaft construction (M26,R1) ∗ Manhole construction at M26 & R1. ∗ Alternative grouting and excavation(M26,R1) ∗ Spot repair works ∗ Field testing (M26, R1) ∗ Pipe jacking (M26, Park street)

∗ HDPE liner welding between shafts ∗ Spot repair works ∗ Over pumping of manholes

C. Environmental Action plan for the Gravity Sewer sub project

Table 5. Environmental Action plan for the Gravity Sewer sub project

Activities Possible causes Effect Mitigation Measures Relevant sites

Unstable slope/undercut, Potential 1 Construction of shaft Collapse of soil Shoring (Cylindrical RCC Caisson) M26 threat to workmen Implementation of traffic management Construction of shaft 2 Traffic congestion Public disturbance plan and road closures as per the local M26,R1 and manholes regulations and approval Wasted fuel increasing air pollution, Construction of shaft Provide sufficient trained traffic 3 Traffic congestion encouraging road issues from the road M26,R1 and manholes controllers and supervision at site users Construction of shaft Possibility of injury to employees & 4 Accidents Hard barricading M26,R1 and manholes Public Construction of shaft Possibility of injury and traffic 5 Accidents Provide signage, lights, blinkers etc. M26 and manholes congestion Construction of shaft Possibility of injury and traffic Provide and Maintain sufficient Public 6 Accidents M26,R1 and manholes congestion Access Contaminates surface water bodies, Temporary storage and immediate 7 Excavation Waste material All Sites health hazards disposal Transport of Slurry spill during 8 Unsafe and unhygienic during transport Dry the materials before transport All Sites excavated material transport Properly cover the material during Transport of Health impact to the road users such 9 Dust generation transportation to avoid dust generation All Sites excavated material as: irritation of eyes and nose and spillage Stock piling of Blocking of public Disturbance to the day today life of Plan and identify location prior to 10 construction All Sites venues nearby residents implementation materials Stock piling of Necessary barricades to isolate the area 11 construction Accidents Workmen health Hazard All Sites and to prevent un authorized access materials

Stock piling of Health issues, irritation of eyes and 12 construction Dust generation Store with necessary coverage All Sites nose & respiratory health issues materials Stock piling of Siltation of barricade and cover materials 13 construction Disturbance to natural flow All Sites drainage canals sufficiently materials Stock piling of Blocking of natural Surface water pollution and possible 14 construction Plan and avoid natural waterways All Sites waterways flooding materials Stock piling of Waste due to left Unnecessary increase in material 15 construction Remove any leftover immediately All Sites over requirement materials Material handling at Irritation of eyes and nose & The dust generating materials are 16 Dust generation All Sites site Respiratory health issues wetted sufficiently Material handling at 17 Noise & vibration Disturbance to public handle one at a time All Sites site Material handling at Avoid collision of materials when 18 Noise & vibration Disturbance to public All Sites site handling Material handling at employ banks man to direct crane 19 Accidents Hazard to workmen health and safety All Sites site drivers Collapse of Damages to the adjacent properties 20 Dewatering Approved Method statement Available All Sites structure and Health of people Collapse of Damages to the adjacent properties 21 Dewatering cracks and settlements are monitored All Sites structure and Health of people Pollution of water Danger to aquatic life and pollution of 22 Dewatering Use prefiltration and silt trap All Sites bodies water sources Siltation of Use sedimentation, prefiltration and silt 23 Dewatering Reduction in flow capacity All Sites drainage canals trap settlement of Monitor of surroundings and 24 Dewatering Damages to the adjacent properties All Sites surrounding immediately hold the activity if any

Micro tunneling Provide sufficient disposal yard and 25 Sludge waste Pollution of surface drainage M26 (Boring) dispose immediately Air pollution Micro tunneling 26 during debagging Respiratory health issues to the public Cover completely when debagging M26 (Boring) of Bentonite Movement of heavy 27 Noise & Vibration Disturbance to public Drive slowly in a limited speed All Sites vehicles Movement of heavy Irritation of eyes and nose & Employ sprinkler bowser and water the 28 Dust All Sites vehicles Respiratory health issues site 29 Grouting Cement dust Irritation of eyes and nose cover completely when debagging All Sites Bar bending, Form 30 works and Rebar Waste danger to the safety of workers collect and dispose immediately All Sites fixing Dismantling Limiting of Workspace and danger to 31 Waste collect and dispose immediately All Sites formworks the safety of workers Irritation of eyes and nose & Dust sprinkle water to curb dust M26 Respiratory health issues Road reinstatement / use serviced machines M26 32 backfilling/Levelling Noise & Vibration Public irritation work slowly M26 /Compaction use off peak hours for road Traffic congestion Public disturbance R1 reinstatement Level and back fill the working site All Sites

Breeding site for Add mosquito dung frequently All Sites 33 water stagnation Spread mosquito borne diseases mosquitoes Remove/ dewater the water retaining structure, waste containers All Sites immediately Pollution of environment and 34 Waste disposal Illegal disposal Disposal in CMC approved location All Sites disturbance to the public Road cutting (Open Use low noise machineries / use 35 Noise Disturbance to public M26 trench) appropriate Cutting bits

Road cutting (Open Irritation of eyes and nose & use sprinkler bowsers before and 36 Dust M26 trench) Respiratory health issues during road cutting Waste Road cutting (Open Disturbance to the transportation of 37 (Bituminous and store and dispose immediately M26 trench) public others) 38 Labour at work accidents Occupational health and safety risk Compliance to H & Safety Plan All Sites

D. Environmental Monitoring plan and Compliance status

Table 6. Environmental monitoring plan and compliance status

Mitigation Measures Monitoring Parameters Monitoring Methods Compliance

1 Shoring (Cylindrical RCC Caisson) Approved Method statement available Physical observation Satisfactory Implementation of traffic management plan and road closures 2 Approved traffic control Plan is available Reviewing the records Satisfactory as per the local regulations and approval Provide sufficient trained traffic sufficient Traffic controllers are available 3 Physical observation Satisfactory controllers and supervision at site at site 4 Hard barricading Shaft area surrounded by hard barricades Physical observation Satisfactory Signage are appropriately placed Physical observation Satisfactory 5 Provide signage, lights, blinkers etc. Blinkers are functioning at night Interview Satisfactory Sufficient lighting provided to the access Interview Satisfactory Provide and Maintain sufficient Access roads are safe & sufficient for 6 Physical observation Satisfactory Public Access mobility Temporary storage and immediate 7 No dried waste available at site Review the records Satisfactory disposal No spill of muds along the roads from site 8 Dry the materials before transport Physical observation Satisfactory to disposal area

Properly cover the material during 9 transportation to avoid dust No spill of mud or dust clouds generation Physical observation Satisfactory generation and spillage Plan and identify location prior to Stock piling location is identified and 10 Physical observation Satisfactory implementation marked Necessary barricades to isolate the 11 area and to prevent un authorized Stock piles are barricaded Physical observation Satisfactory access 12 Store with necessary coverage Stockpiles are covered or wetted Physical observation Satisfactory barricade and cover materials No siltation at the adjacent drainage 13 Physical observation Satisfactory sufficiently canal/ Water bodies /Road. 14 Plan and avoid natural waterways Waterways are not blocked Physical observation Satisfactory

15 Remove any leftover immediately No left over of stocked materials Physical observation Satisfactory The dust generating materials are 16 No dust clouds while handling materials Physical observation Satisfactory wetted sufficiently 17 handle one at a time Noise level is within permissible level Reviewing the records Satisfactory Avoid collision of materials when 18 Noise level is within permissible level Reviewing the records Satisfactory handling employ banks man to direct crane 19 Banks man are available Physical observation Satisfactory drivers Approved Method statement 20 No collapses or cracks Physical observation Satisfactory Available cracks and settlements are 21 Records are maintained Reviewing the records Satisfactory monitored Reasonably clear water is discharged into 22 Use prefiltration and silt trap Physical observation Satisfactory drains Use sedimentation, prefiltration and 23 No siltation or blocks in the drains Physical observation Satisfactory silt trap Monitor of surroundings and Caution to the nearby structures and 24 Physical observation Satisfactory immediately hold the activity if any complains made by residents

Provide sufficient disposal yard and 25 Permission is obtained for disposal yards Reviewing the records Satisfactory dispose immediately 26 Cover completely when debagging Sludge are disposed immediately Physical observation Satisfactory

27 Drive slowly in a limited speed Noise level is within permissible level Reviewing the records Satisfactory Employ sprinkler bowser and water 28 No observable dust clouds Physical observation Satisfactory the site 29 cover completely when debagging Debagging point is covered fully Physical observation Satisfactory

30 collect and dispose immediately Site is clean Physical observation Satisfactory

31 collect and dispose immediately Site is clean Physical observation Satisfactory sprinkle water to curb dust No dust clouds Physical observation Satisfactory use serviced machines Noise level is within permissible level Physical observation Satisfactory 32 work slowly Noise level is within permissible level Physical observation Satisfactory use off peak hours for road disturbance to the public is minimized Physical observation Satisfactory reinstatement No unnecessary water collection locations Level and back fill the working site Physical observation Satisfactory found Add mosquito dung frequently No mosquito larvae found in the shafts Physical observation Satisfactory 33 Remove/ dewater the water Site is free from any water retaining retaining structure, waste Physical observation Satisfactory containers containers immediately 34 Disposal in CMC approved location Disposal permit is available Reviewing the records Satisfactory Use low noise machineries / use 35 Noise level is within permissible level Physical observation Satisfactory appropriate Cutting bits use sprinkler bowsers before and 36 No dust clouds at the surroundings Physical observation Satisfactory during road cutting 37 store and dispose immediately The site is clean Physical observation Satisfactory No of incidents occur at site during the 38 Compliance to H & Safety Plan Review the records Satisfactory period

E. Natural Environment:

The excavated materials were transported and dumped safely in a designated and approved dump yard approved by Colombo Municipal Council (CMC). The dust generated during the movement of vehicle was minimized by driving slowly and by watering as and when required.

The micro tunneling brings less environmental pollution than the open cut method. However, dust generation is possible during cement and bentonite is unpacked particularly during grouting. Care is being taken to control the spread of dust when unpacked in the bentonite tank. The slurry from the bentonite tank is frequently removed, transported and dumped in an approved dump yard belong and maintained by to CMC.

A baseline crack survey on properties and random monitoring of noise, dust and vibration were conducted along the work site to address any complaint in future.

F. Occupational Health and Safety:

Environmental Manager, Health and Safety Manager are available to implement the provisions of the EMP. The following statistics which are extracted from the contractors Monthly reports are reported.

Safety Statistics

฀ Safety meetings 06: Safety meetings are held for staff in ad hoc manner. This is a brainstorming sessions for all staff to refresh their safety concerns.

฀ Tool box talks 21: Tool box talks are held at site at safety and environment related topics. These were majorly under Public safety, Use of hand tools, Safety helmets, Hearing protection and moving vehicles at site.

฀ Safety inspections 34: The contractor’s safety staff together with PMU site staff will conduct inspections / safety audits time to time. These include monthly fire extinguisher check, Inspection of first aid boxes etc.

฀ Incidents 12: The Risk assessment was revised based on these incidents.

฀ Near misses 4: The Risk assessment was revised based on these incidents.

฀ Medical treatment cases 0: no medical treatment cases were reported during the period.

Necessary sign boards were erected at places wherever necessary. Additional Sign boards placed to remind workers to use proper PPE at site and to restrict unauthorized entries to working area.

The transfer of heavy pipes was through flat-bed truck from yard to site and pipe transferring was carried out using loaders.

G. Community Health and Safety:

The pipe jacking work is carried out with micro tunneling technology which minimizes the interruption to the public. However, use of heavy vehicles and other machineries and operation like bentonite dosing and recycling water is potentially give some interruption to 20

the public. In order to minimize the potential risk, pipe jacking is carried out at day and night to expedite the works and traffic controller with special illuminated vests and helmet were employed day and night to control the traffic. Necessary barricades and sign boards were placed to prevent unauthorized entry to the site. The shaft pit or jacking pit is completely fenced to prevent any accident or fall. They are completely shored with approved method to prevent any possible collapses.

There were recorded 03 complaints against the activities carried out during the reporting period where 02 complaints are related to vibration issues (1from M26 and 1 from R1) while 01 complaint is related to high noise levels(M26).

Out of the two complaints related to vibration, one complaint was further mentioned that folding door of a structure has stuck after the vibration experienced. Accordingly, contractor has inspected the site and lately obtained a quotation for the repair work from the owners. Currently payment for the damage is under progress. The other vibration issue is recorded at R1 site regarding high vibration levels experienced by a restaurant/shop. The complaint was made by telephone and massage was passed to construction team to take prompt action.

Complaint made on high noise was also solved after prompt actions taken by the construction team.

3.4. Rehabilitation of Pumping Stations and Pumping Mains:

A. Sites Under this package

Table 7. Details of the pumping station project

Planned Physical Financial Details Date of award Status completion progress Progress Super structure for 3 pumping stations, M&E installation Contractor: for One pumping Larson and station, pilling Turbo Pvt. Ltd 30/07/2015 31/12/2020 works for one 58.03% 50% Contract pumping station Amount: and design works USD 57.84 mil for 2 pumping station are in progress

This project majorly contain rehabilitation of eleven numbers of CMC owned Sewerage pumping stations namely Wanathamulla, Thimbirigasyaya, Maligawatta, Bambalapitiya, Vystwyke, Polwatta, Borella, Fort, CS3, Harbour and Slave Islands. Out of them eight number of pumping stations are in progress at the moment and two were omitted.

Activities carried out during reporting period. Major Activities

Table 8. Major activities of Pumping Station

Pumping Activities station

• Brickwork and plastering work of superstructure. • Erection of roof truss. • Construction of DG Room (including the casting of roof slab). WAN-PS • Mechanical equipment installation. • Construction of sub-structure parts as per the requirements. • Backfilling works

• Construction of the boundary wall. • Excavation activities for the construction of inlet arrangement. • Housekeeping activities at the inlet chamber, wet well & grit chamber BAM-PS area. • Formwork, bar bending and concreting activities of DG room • Electrical conduit works. • Erection of mechanical equipment.

• Deep excavation activities at the wet well area & shifting of excavated debris for proper disposal. • Rock excavation by chemical expansion of rocks. VYS-PS • Bracing installation for secant pile wall. • Gas cutting and welding activities (for bracing installation). • Dust Control and housekeeping activities • Installation of guard rails for the bracings

• Mobilization activities including site clearance and levelling. • Erection of the tower crane • Transportation of excavated debris for safe disposal • Site clearing, housekeeping and dust control activities. MAL-PS • Silt removal activities at the wet well as well as the screen chamber areas of the existing pumping station. • Hacking of the piles for capping beam construction. • Construction of the capping beam

• Deep excavation activities including rock excavation at the wet well area. THMB-PS • Bracing installation. • Gas cutting and welding activities (bracing installation works). • Routine housekeeping activities and solid waste management.

SLV-PS • Removal of excavated debris 22

• Excavation activities for the construction of the flow meter chamber. • Erection of the roof of the pumping station. • Brick work and plastering work of superstructure.

• Formwork, bar bending and concreting of super structure. • Brick work and plastering works of super structure. CS3-PS • Removal of dismantled materials and excavated debris • Construction of the pump operator roof top.

• Dismantling activities of the existing pumping station • Guide beam construction for secant pile wall Borella-PS • Site cleaning, segregation and disposal of waste materials and housekeeping activities. • Secant Piling

B. Natural Environment:

Environmental Manager, Health and Safety Manager and Public Relations officer are available to implement the provisions of the EMP. In addition, Environmental, Health and Safety Officers are appointed by the contractor at site, for monitoring and implementation of EHS activities at site level reporting to the Environmental, Health & Safety Managers including the site engineer.

Due to the intermittent rains and the onset of south-west monsoon, rainy period has impacted the construction sites, including creating water stagnation and in turn creating possible mosquito breeding grounds at various sites of GCWMP. The site staffs were provided with necessary awareness on managing mosquito such as,

a. Primarily clearing of breeding grounds b. Usage of larvicides to control mosquito breeding c. Necessary fumigation activities including necessary guidance from Health Inspector (PHI) of the area.

Information/details on larvisides maintained by the site staff were noted as follows.

Figure 3. Mosquito control options recommended at site

Any water retaining structures are frequently treated with larvicides to prevent mosquito breeding.

Figure 4. larvicide samples used at site

Figure 5. Fumigation at site

Figure 6. Awareness posters to Dengue prevention at sites

The Environmental Baseline Measurements were carried out in all pump station sites to record the status of the environment prior to the starting of construction activities at sites.

During the last six months period (2019 Jan-July), such measurements were observed and recorded at Borella- PS by National Building Research Organization (NBRO).

Figure 7. Ground Water Quality measurements by NBRO conducted at Borella-PS project

influential area

Figure 8. Baseline Ambient Air Quality measurement conducted by NBRO at Borella-PS

Figure 9. Baseline Noise Quality measurement conducted by NBRO at Borella-PS

Figure 10. Baseline vibration measurements conducted by NBRO at Borella-PS

Solid Wastes generated in the site includes the food and other waste collected due to activities of staff and due to construction activities. Based on the Local Authority (CMC) requirements, the Solid Waste produced on site are managed through an established Solid Waste Management System (SWMS) at all key construction sites and daily monitoring by the Environmental Manager and Health and Safety manager including the PRO at site.

Figure 11. Waste collection containers at Vystwyke-PS

All the above waste management in the Pumping Station sites are followed in line with the Waste Management Plan (WMP). Please refer below the waste rock material excavated through rock expansion method, ready for disposal at prior approved location by CMC.

Figure 12. Rock particles extracted from bedrock

The Pre-Construction crack survey has been completed at all ongoing key construction sites and monitoring is in progress. In case any reported issue on crack development in adjacent 29

construction, location identification and measurements were recorded in registers at sites for monitoring and future reference.

Figure 13. Properties subjected to crack survey in Borella-Pumping Station

In order to offset the number of trees been removed during the site clearance and development of pumping station sites, L&T has undertaken tree plantation drive and planted about 50 Nos of trees along the canal bank adjacent to Kelani Tissa power plant at Colombo. Chairman and the Representatives of Sri Lanka Land Reclamation and Development Corporation (SLLRDC) were participated in this event along with L&T Employees.

Figure 14. Tree plantation program

C. Occupational Health and Safety:

Daily pep talk sessions are being carried out at site level and significant EHS issues and abatement measures anticipated during the construction activities are discussed at the workmen level.

Necessary sign boards such as safety first, first aid station were erected at appropriate places. Additional Sign boards placed to remind workers to use proper PPE at site and to restrict unauthorized entries to working area. Special safety sign boards were installed near the deep excavated sites.

Figure 15. Daily PEP-Talk conducted at Wanathamulla-PS

Figure 16. PEP talks provided for the Workmen at Borella-PS

To ensure the awareness among the workmen and staff on Environmental aspects and management, series of trainings on the EHS areas are conducted during the construction.

Figure 17. EHS training provided for the office staff at L&T Office

Figure 18. EHS-Safe Execution Engineering (SEE) training for staff

D. Community Health and Safety:

A grievance redress Mechanism (GRM) has been introduced to this project by ADB together with Ministry and CMC. Through that, it is expected to solve project related impacts efficiently to the satisfaction of the affected people and the stakeholders. 33

Monitoring and reporting of Social Safeguard Parameters are done by CMC’s Project Management Unit (PMU) through regularly visits to the sites and note down all social safeguard activities against the details provided in resettlement plans.

Door to door awareness sessions have been done for public living to disclose construction related disturbances and complaint handling procedure of the project. In case of unexpected damages to public property, contractor shall take efforts to resolve the issue at his level and if it fails it will be forwarded to GRM for further investigation.

Environmental compliance addressing through the Grievances Redressal Mechanism is been detailed through Social Safeguard Monitoring Bi-Annual Report.

E. Environmental Action plan for pumping station sub project

Table 9. Environmental Action plan for pumping station sub project

Activities Possible causes Effect/Impact Monitoring Methods Compliance

Spillage and Wash-off water contaminates Construction of Super- Control the spillage through necessary 1 handling during surface water bodies, health Relevant sites structure handling methods implementation hazards. Dumping of excess Usage of excess concrete for access Construction of Super- Unsafe to the workmen and 2 concrete inside the pathways or other predetermined Relevant sites structure improper housekeeping practices site premises requirements of site Construction of Super- Falling of workmen from the site Provision of proper access, scaffolding, 3 Working at Height Relevant sites structure Health Hazard for the workmen full body harness to workmen Unstable slope/under cuts, Proper implementation of shoring 4 Sheet piling Collapse of soil Relevant sites potential threat to Workmen method Implementation of Traffic management 5 Sheet piling Traffic congestion Public disturbance plan and road closures as per the local Relevant sites regulations and approval Construction of wet Unstable slope/under cuts, 6 well, Grit Chamber and Collapse of soil Proper Shoring Method (Secant piling) Relevant sites potential threat to Workmen inlet chamber Use low noise machineries / use 7 Secant Piling /Drilling Noise & Vibration Public disturbance/irritation appropriate drilling machineries and PS methods Unsafe for workmen in contact with 8 Secant Piling /drilling Desilting Sludge Dry & Dispose immediately as per EMP PS sludge disturbance to the public and control vibration through substitute 9 Rock excavation Noise & Vibration Vystwyke surrounding properties methods Contaminates surface water bodies, Temporary storage and immediate 10 Excavation Waste Material All Sites health hazards. disposal Transport of excavated Slurry spill during Unsafe and unhygienic during road 11 Dry the materials before transport All Sites material transport transportation Properly cover the material during Transport of excavated Health impacts to the road users 12 Dust generation transportation to avoid dust generation All Sites material such as: Irritation of eyes and nose and spillage 35

Stock piling of Blocking of public Disturbance to day today activities Plan and identify the location prior to 13 All Sites construction materials venues and access for public implementation Stock piling of Necessary Barricades to isolate the area 14 Accidents Workmen health Hazard All Sites construction materials and to prevent an unauthorized access Stock piling of Health issues, Irritation of eyes and Storage with necessary coverage / 15 Dust generation All Sites construction materials nose & respiratory health issues Wetted Stock piling of Siltation of drainage Barricade and cover the material 16 Disturbance to natural flow All Sites construction materials canals sufficiently Stock piling of Blocking of natural Surface water pollution and 17 Plan and avoid natural waterways All Sites construction materials waterways possible flooding Stock piling of Waste due to left Unnecessary increase in material 18 Remove any leftover immediately All Sites construction materials over requirement Irritation of eyes and nose & Periodic wetting of dust generating 19 Material handling at site Dust generation All Sites Respiratory health issues materials sufficiently Avoid collision of materials when 20 Material handling at site Noise & vibration Disturbance to Public All Sites handling Hazard to Workmen health and employ bank man to Signal and direct 21 Material handling at site Accidents All Sites safety crane operators 22 Material handling at site Noise & vibration Disturbance to Public Implement some noise control methods All sites Damages to the adjacent properties 23 Dewatering Collapse of structure Approved Method statement Available All Sites and Health of people Damages to the adjacent properties 24 Dewatering Collapse of structure cracks and settlements are monitored All Sites and Health of people Pollution of water Danger to aquatic life and pollution 25 Dewatering Use prefiltration and silt trap All Sites bodies of water sources Siltation of drainage Use Sedimentation, prefiltration and silt 26 Dewatering Reduction in flow capacity All Sites canals traps Ground settlement Monitor the surrounding and 27 Dewatering Damages to the adjacent properties All Sites of surrounding immediately the activity if any Movement of heavy 28 Noise & Vibration Disturbance to Public Drive slowly in a limited speed All Sites vehicles Movement of heavy Irritation of eyes and nose & Employ sprinkler bowser and water the 29 Dust All Sites vehicles Respiratory health issues site 30 Grouting Cement dust Irritation of eyes and nose cover completely when debagging All Sites

Bar bending, Form works 31 Waste danger to the safety of workers collect and dispose immediately All Sites and Rebar fixing Limiting of Workspace and danger 32 Dismantling formworks Waste Collect and dispose immediately All Sites to the safety of workers Potential mosquito 33 Water stagnation Spread mosquito borne diseases Level and backfill the working site All Sites breeding Add mosquito dung frequently All Sites

Remove/dewater the water retaining All Sites structure, waste containers immediately Pollution of environment and 34 Waste disposal Illegal disposal Disposal in the CMC approved location All Sites disturbance to the public Possible health hazards to the Provision of proper access, scaffolding, 35 Working at heights Accidents All Sites shop workmen full body harness to workmen 36 Labour at work Accidents Occupational health and safety risk Compliance to Health & Safety Plan All Sites

F. Environmental Monitoring Plan and Compliance status

Table 10. Environmental monitoring plan and compliance status

Mitigation Measures Monitoring Parameters Monitoring Methods Compliance

Control the spillage through necessary 1 Approved method statement available Physical Observation Satisfactory handling methods Usage of excess concrete for access pathways 2 Quantity of dumping concrete Physical Observation Satisfactory or other predetermined requirements of site Provision of proper access, scaffolding, full 3 Approved method statement available Physical Observation Satisfactory body harness to workmen 4 Proper implementation of shoring method Approved method statement available Reviewing the records Satisfactory Implementation of Traffic management plan 5 and road closures as per the local regulations Approved traffic plan Physical Observation Satisfactory and approval 6 Proper Shoring Method (Secant piling) Approved method statement available Reviewing the records Satisfactory Use low noise machineries / use appropriate 7 Noise level is within permissible level Physical observation Satisfactory drilling bits 8 Dry & Dispose immediately No sludge stocks are at site Physical observation Satisfactory

rock expansion through chemical expansion 9 Approved method statement available Physical observation Satisfactory technique 10 Temporary storage and immediate disposal Disposal permit is available Review the records Satisfactory No spill of muds along the roads from site to disposal 11 Dry the materials before transport Physical observation Satisfactory area 12 Properly cover the material during transport No spill of mud or dust clouds generation Physical observation Satisfactory Plan and identify the location to 13 Stock piling location is identified and marked Physical observation Satisfactory implementation 14 Barricade to prevent un authorized access Stock piles are barricaded Physical observation Satisfactory 15 Store under cover / Wetted Stockpiles are covered or wetted Physical observation Satisfactory No siltation at the adjacent drainage canal/ Water 16 Barricade sufficiently Physical observation Satisfactory bodies /Road. 17 Plan and avoid natural waterways Waterways are not blocked Physical observation Satisfactory 18 Remove any leftover immediately No left over of stocked materials Physical observation Satisfactory The dust generating materials are wetted 19 No dust clouds while handling materials Physical observation Satisfactory sufficiently 20 Avoid collision of materials when handling Noise level is within permissible level Reviewing the records Satisfactory 21 Employ banks man to direct crane drivers Banks man are available Physical observation Satisfactory 22 Implement noise control methods measure the intensity of a noise Review the records Satisfactory 23 Approved Method statement Available No collapses or cracks Physical observation Satisfactory 24 Cracks and settlements are monitored Records are maintained Reviewing the records Satisfactory 25 Use pre-filtration and silt trap Reasonably clear water is discharged into drains Physical observation Satisfactory 26 Use pre-filtration and silt trap No siltation or blocks in the drains Physical observation Satisfactory Caution to the nearby structures and complains 27 observe the surrounding and stop if any Physical observation Satisfactory made by residents 28 Drive slowly Noise level is within permissible level Reviewing the records Satisfactory 29 Employ sprinkler bowser and water the site No observable dust clouds Physical observation Satisfactory 30 Cover completely when debagging debagging point is covered fully Physical observation Satisfactory 31 Collect and dispose immediately Site is clean Physical observation Satisfactory 32 Collect and dispose immediately Site is clean Physical observation Satisfactory 33 Level and backfill the working site No unnecessary water collection locations found Physical observation Satisfactory Add mosquito dung frequently No mosquito larvae found in the shafts Physical observation Satisfactory

Remove/dewater the water retaining Site is free from any water retaining containers Physical observation Satisfactory structure, waste containers immediately 34 Disposal in the CMC approved location Disposal permit is available Physical observation Satisfactory Provision of proper access, scaffolding, full 35 Approved method statement available Physical observation Satisfactory body harness to workmen 36 Compliance to Health & Safety Plan No of incidents occur at site during the period Reviewing the records Satisfactory

4. PHOTOGRAPHS

Figure 19. EHS Safety Month Celebrations to improve the safety culture among workmen at Borella-PS

Figure 20. Inauguration of EHS-Safe Execution Engineering Training at Borella-PS

Figure 21. EHS-Health checkup conducted for the Workmen

Figure 22. EHS-PEP Talk conducted for the Workmen for the night work at Malligawatte-PS

Figure 23. EHS-Onsite training conducted for the Workmen at Borella-PS

Figure 24. EHS- Induction training conducted for the Workmen at Slave Island -PS

Figure 25. EHS awareness quiz program conducted for Contractor staff

Figure 26. Health checkup for workers

Figure 27. EHS Executive Walkdown conducted to ensure EHS implementations at site

Figure 28. EHS-PEP Talk conducted for the Workmen at Wanathamulla-PS

Figure 29. Fumigation conducted to manage mosquito at Bambalapitiya-PS

Figure 30. EHS- Safety Month Inauguration session at Borella-PS