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Technical Assistance Consultant's Report Nauru: Sustainable And

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Technical Assistance Consultant's Report Nauru: Sustainable And Technical Assistance Consultant’s Report Project Number: 48480 December 2017 Nauru: Sustainable and Climate-Resilient Connectivity Project Financed by the Asian Development Fund Prepared by Cardno Emerging Markets Fortitude Valley, QLD, Australia For Ministry of Finance Implementing agency This consultant’s report does not necessarily reflect the views of ADB or the Government concerned, and ADB and the Government cannot be held liable for its contents. (For project preparatory technical assistance: All the views expressed herein may not be incorporated into the proposed project’s design. GRANT 6005-NAU: UXO Clearance, Geotechnical Investigations, Surveys and Detailed Engineering Services Final Interim Report – UXO Assessment Report Figure 4 : Four Separate ERW Remediation Environments (from Appendix D - Part B ERW Risk Assessment and Mitigation Plan - Plate 2) 31. ERW Remediation in Area 1, which is bordered by the Waterfront Road in the west and the project boundaries in all other directions, is problematic due to existing structures and building detritus. These structures and the surrounding detritus will interfere with the operation of detection equipment and severely limit its use. Removal of all structures and debris under the direction of Explosive Ordnance Disposal (EOD) Technician and then a 100% area coverage Geophysical ERW Survey or a 100% area coverage Analogue ERW Survey depending on the surface conditions post structure removal is recommended. On completion of the survey the data would be processed and a team of EOD Technicians would investigate every discrete ferrous anomaly to determine whether it is ERW or otherwise. Dependent on the Senior EOD Technician’s judgment, all ERW would be either removed, rendered safe and removed, or disposed of in place. This is considered impractical at this early stage of the project to be generally undertaken in the port area where reinforced concrete floor slabs exist in buildings which are scheduled for demolition in the near future. In areas where geotechnical testing is necessary, it is recommended. 32. Area 2 comprises the beach and reef zones. The eastern section which abuts Area 1 was not able to be processed into valid data due to the presence of building and other domestic detritus. There is a significant amount of metallic debris in the area (above and below ground) as indicated in Figure 5 below. At this early stage of the project removal of debris and further GRANT-6005 NAU - Final Interim Report - UXO Assessment Report.docx 21 September 2016 Page 12 of 20 GRANT 6005-NAU: UXO Clearance, Geotechnical Investigations, Surveys and Detailed Engineering Services Final Interim Report – UXO Assessment Report investigation are not warranted for locations other than for borehole positions, but these can be relocated to avoid positions of anomalies. Figure 5 : Northern Section Area 2 - Processed Magnetic Data Plot (from Appendix D - Part B ERW Risk Assessment and Mitigation Plan) 33. Area 3 is the crossover zone on the edge of the reef between land and marine and is an especially difficult area. It is too shallow for a towed marine survey and water surge provides a difficult working environment for divers. To clear this area, divers are recommended with underwater magnetometers be used. However for the drilling of boreholes, relocation of the borehole to an adjacent position is suggested. 34. Area 4 is the offshore area where no construction would be required and needs no further consideration. 3.2.3 ERW Risk Matrix 35. Due to the problematic conditions present on the site, high levels of non-ordnance related ferrous waste, the surf zone, and the small size, yet still hazardous nature of some ordnance types, there will always remain a small residual risk of ERW contamination on the site. 36. A qualified EOD Technician should be engaged as an ERW Safety Officer and should be present on-site for any construction phase of the ADB Nauru Port Development Project. The ERW Safety Officer would provide advice regarding ERW remediation certification and ERW mitigation requirements, conduct small area clearance for unanticipated works outside the ERW remediation certified area, and also provide an immediate response to any ERW finds. The Project Risk Matrix is presented below. Figure 6 : Project Risk Matrix (from Appendix D - Part B ERW Risk Assessment and Mitigation Plan) GRANT-6005 NAU - Final Interim Report - UXO Assessment Report.docx 21 September 2016 Page 13 of 20 GRANT 6005-NAU: UXO Clearance, Geotechnical Investigations, Surveys and Detailed Engineering Services Final Interim Report – UXO Assessment Report 37. However any intrusive work conducted during the investigative stages of this project would require the presence of an EOD Technician to conduct small area ERW avoidance searches. GRANT-6005 NAU - Final Interim Report - UXO Assessment Report.docx 21 September 2016 Page 14 of 20 GRANT 6005-NAU: UXO Clearance, Geotechnical Investigations, Surveys and Detailed Engineering Services Final Interim Report – UXO Assessment Report 4 CONCLUSIONS AND RECOMMENDATIONS 38. ERW remediation is difficult in Area 1 where existing structures and obstacles interfere with the operation of detection equipment and severely limit its use. Dependent on the Senior EOD Technician’s judgment, all ERW would be either removed, rendered safe and removed, or disposed of in place. This is considered impractical at this early stage of the project to be generally undertaken in the port area where reinforced concrete floor slabs exist in buildings which are scheduled for demolition in the near future. In areas where geotechnical testing is necessary, it is recommended. 39. Area 2 comprises the beach and reef zones where there is a significant amount of metallic debris in the area (above and below ground). At this early stage of the project removal of debris and further investigation are not warranted for locations other than for borehole positions, but these can be relocated to avoid positions of anomalies. 40. Area 3 is the crossover zone on the edge of the reef between land and marine and is too shallow for a towed marine survey and water surge provides a difficult working environment for divers. To clear this area, it is recommended that divers with underwater magnetometers be used as the project proceeds beyond the preliminary stage. However for the drilling of boreholes, relocation of the borehole to an adjacent position is recommended. 41. Area 4 is the offshore area where no construction would be required and needs no further consideration. 42. A senior EOD Technician has been approved to attend geotechnical drilling to provide monitoring of any ERW present. GRANT-6005 NAU - Final Interim Report - UXO Assessment Report.docx 21 September 2016 Page 15 of 20 GRANT 6005-NAU: UXO Clearance, Geotechnical Investigations, Surveys and Detailed Engineering Services Final Interim Report – UXO Assessment Report Appendix A: UXO Survey Extent GRANT-6005 NAU - Final Interim Report - UXO Assessment Report.docx 21 September 2016 Page 16 of 20 NORTH NAURU EXISTING DATE PLOTTED: 11 August 2016 3:35 PM BY : ERWIN FRANCISCO DATE PLOTTED: 11 August 2016 3:35 PM BY : AIWO PORT PORTION 208 SITE LOCATION PLAN NTS NAURU EXISTING AIWO PORT LOCALITY PLAN SCALE 1:10000 0 15 30 45 60 75m NOTE: GENERAL LAYOUT PLAN SCALE 1:750 @A1 PORTION 208 IS INDICATIVE LOCATION AND OUTLINE ONLY AND 0 200 400 600 800 1000m SHALL BE VERIFIED DURING ACTUAL TOPOGRAPHIC SURVEY. SCALE 1:750 SCALE 1:10000 @A1 Drawn Date Client MR 28/06/2016 NAURU Cardno Limited All Rights Reserved. ® Checked Date Project NAURU PORTS DEVELOPMENT PROJECT Status This document is produced by Cardno Limited solely for the Designed Date FOR CONCEPT APPROVAL benefit of and use by the client in accordance with the NOT TO BE USED FOR CONSTRUCTION PURPOSES WHUPVRIWKHUHWDLQHU&DUGQR/LPLWHGGRHVQRWDQGVKDOOQRW Verified Date DATUM Scale Size assume any responsibility or liability whatsoever to any third Cardno (Qld) Pty Ltd | ABN 57 051 074 992 Title WGS84 AS SHOWN A1 party arising out of any use or reliance by third party on the /HYHO6W3DXO¶V7HUUDFH AIWO PORT Approved Drawing Number Revision content of this document. Fortitude Valley, QLD 4006 UXO SURVEY EXTENT BOUNDARY 1 28/06/2016 ISSUED AS DRAFT TO CLIENT FOR DISCUSSION Tel: 07 3369 9822 Fax: 07 3369 9722 Rev. Date Description Des. Verif. Appd. Web: www.cardno.com.au AC86100-PD-0102 A XREF's: Contours CAD File: W:\ACM941036 Nauru Port Development Project - PDA\(3) Design & Documentation\CAD\Sketch6.dwg CAD File: GRANT 6005-NAU: UXO Clearance, Geotechnical Investigations, Surveys and Detailed Engineering Services Final Interim Report – UXO Assessment Report Appendix B: UXO Site-Specific Environmental Management Plan (SEMP) GRANT-6005 NAU - Final Interim Report - UXO Assessment Report.docx 21 September 2016 Page 17 of 20 Government of Nauru UXO - Site Specific Environmental Management Plan (SEMP) GRANT Number: 6005-NAU Date: 28 July 2016 Nauru: Port Development Project– Project Design Advance (48480-002) UXO Clearance, Geotechnical Investigations, Surveys and Detailed Engineering Services Prepared for: Government of Nauru Asian Development Bank Nauru Port Authority Prepared By: Cardno Emerging Markets (Australia) Pty Ltd Level 11, 515 St Paul's Terrace, Fortitude Valley, Queensland 4006 Australia Milsearch Pty Ltd Level 1, Unit 4-5, 30 Mawson Place, Mawson, ACT, Australia, 2607 GRANT 6005-NAU: UXO Clearance, Geotechnical Investigations, Surveys and Detailed Engineering Services UXO – Site Specific Environmental Management
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