Greater Colombo Wastewater Management Project
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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 2 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 3 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 4 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,