GQF10A – FRONT PAGE FORM Revision: 01 Gas Pipeline lnterconnection Malta-Italy Project File: Form Rev. & Date 08-EN - 2016/05/18 PSA - UXOS, CABLES PIPELINE RECONNAISSANCE SURVEY Gas Pipeline lnterconnection Malta-Italy Project REPORT Determination of positions of UXOs and cables GAS PIPELINE INTERCONNECTION MALTA-ITALY POST SURVEY ASSESSMENTS Produced by : Lighthouse S.p.A. - Bologna - Italy Contract No. : CT3110/2018 Survey Area : Sicily Strait Survey Period : Feb./March 2019 IDP Delivery Date File Name Revision MEW001 13/09/2019 UXOs, Cables - Final Final MEW001 30/08/2019 MEW001_WP2_DUWC_FINAL_Rev00.doc Final LIGHTHOUSE document control Prepared by Checked by Approved by G. Sallese M. Bernardi E. Lozza CUSTOMER document control Project Number Checked by Approved by Date Contract n. CT3110/2018 GAS PIPELINE INTERCONNECTION MALTA-ITALY POST SURVEY ASSESSMENT DETERMINATION OF POSITIONS OF UXOS AND CABLES Issued Checked by Approved by Date IDP File: Rev. 01 G.Sallese M.Bernardi E.Lozza 13/09/2019 MEW001 PSA - UXOs, Cables P. 2/ 63 TABLE OF CONTENTS 1.0.0 DEFINITIONS AND ABBREVIATIONS ...................................................................... 4 1.1.0 DEFINITIONS ............................................................................................................ 4 1.2.0 ABBREVIATIONS ......................................................................................................... 4 2.0.0 GENERAL CONSIDERATIONS .................................................................................. 5 2.1.0 INTRODUCTION .......................................................................................................... 6 2.2.0 SURVEY GEODETIC SYSTEM ........................................................................................... 6 3.0.0 PUBLICLY AVAILABLE INFORMATION .................................................................... 7 3.1.0 CABLES ................................................................................................................... 7 3.2.0 PIPELINES ................................................................................................................ 9 4.0.0 RESULTS FROM PMRS DATA STUDY ...................................................................... 10 4.1.0 CABLES AND PIPELINES FROM GEOPHYSICAL DATA .............................................................. 11 4.2.0 OTHER MAN-MADE STRUCTURES FROM GEOPHYSICAL DATA ................................................... 13 4.3.0 MAN-MADE FEATURES FROM ROV SURVEY ....................................................................... 14 5.0.0 UXO SURVEY RESULTS ......................................................................................... 15 5.1.0 UXO DETECTED DURING PMRS GEOPHYSICAL SURVEY .............................................. 15 5.2.0 GELA UXO SURVEY RESULTS .................................................................................. 16 5.2.1 Preliminary Historical Study ................................................................................................. 16 5.2.2 Documentary Analysis ......................................................................................................... 17 5.2.3 Geophysical Survey ............................................................................................................ 17 5.2.4 Conclusion ......................................................................................................................... 17 6.0.0 APPENDICES ........................................................................................................ 18 6.1.0 CABLE CROSSINGS LIST ............................................................................................. 18 6.2.0 SIDE SCAN SONAR CONTACTS LIST (ITALY NEARSHORE AREA) ................................................ 20 6.3.0 SIDE SCAN SONAR CONTACTS LIST (ITALY-MALTA OFFSHORE CORRIDOR) .................................. 21 6.4.0 SIDE SCAN SONAR CONTACTS LIST (MALTA NEARSHORE AREA) .............................................. 28 6.5.0 MAGNETIC ANOMALIES LIST (ITALY NEARSHORE AREA) ........................................................ 34 6.6.0 MAGNETIC ANOMALIES LIST (ITALY-MALTA OFFSHORE CORRIDOR) ........................................... 35 6.7.0 MAGNETIC ANOMALIES LIST (MALTA NEARSHORE AREA) ....................................................... 54 6.8.0 ROV TARGETS LIST .................................................................................................. 59 6.9.0 UXO SURVEY REPORT ................................................................................................ 63 Contract n. CT3110/2018 GAS PIPELINE INTERCONNECTION MALTA-ITALY POST SURVEY ASSESSMENT DETERMINATION OF POSITIONS OF UXOS AND CABLES Issued Checked by Approved by Date IDP File: Rev. 01 G.Sallese M.Bernardi E.Lozza 13/09/2019 MEW001 PSA - UXOs, Cables P. 3/ 63 LIST OF FIGURES Figure 1 - Overview of reconnaissance survey route .................................................................................. 5 Figure 2 - Existing cables overview .......................................................................................................... 8 Figure 3 – Italy Nearshore: existing and planned pipelines ......................................................................... 9 Figure 4 - Magnetometer data example: magnetic anomaly M0476 on Mena IS cable .................................. 12 Figure 5 - SSS data example: dumping area with several detected targets ................................................. 13 LIST OF TABLES Table 1 – Geodetic data and projection parameters ................................................................................... 6 Table 2 – Existing cables list ................................................................................................................... 7 Table 3 – Detected SSS contacts and magnetic anomalies (PMRS study) .................................................... 10 Table 4 – ROV detected UXOs ............................................................................................................... 16 Table 5 – SSS detected UXOs ............................................................................................................... 16 Table 6 – Cable crossings list (PMRS study) ............................................................................................ 18 Table 7 – Pipelines/Cables : SSS contacts list (Italy Nearshore) ................................................................ 20 Table 8 – Other Man-made Structures: SSS contacts list (Italy Nearshore)................................................. 20 Table 9 – Pipelines/Cables : SSS contacts list (Italy-Malta Offshore) .......................................................... 21 Table 10 – Other Man-made Structures: SSS contacts list (Italy-Malta Offshore) ........................................ 21 Table 11 – Other Man-made Structures: SSS contacts list (Malta Nearshore) .............................................. 28 Table 12 – Other Man-made Structures: magnetic anomalies list (Italy Nearshore) ..................................... 34 Table 13 – Pipelines/Cables: magnetic anomalies list (Italy-Malta Offshore) ............................................... 35 Table 14 – Other Man-made Structures: magnetic anomalies list (Italy-Malta Offshore) ............................... 40 Table 15 – Other Man-made Structures: magnetic anomalies list (Malta Nearshore) .................................... 54 Table 16 – ROV Targets List ................................................................................................................. 59 Contract n. CT3110/2018 GAS PIPELINE INTERCONNECTION MALTA-ITALY POST SURVEY ASSESSMENT DETERMINATION OF POSITIONS OF UXOS AND CABLES Issued Checked by Approved by Date IDP File: Rev. 01 G.Sallese M.Bernardi E.Lozza 13/09/2019 MEW001 PSA - UXOs, Cables P. 4/ 63 1.0.0 DEFINITIONS AND ABBREVIATIONS 1.1.0 Definitions CLIENT: Maltese Ministry for Energy and Water Management CONTRACTOR: LIGHTHOUSE S.p.A. 1.2.0 Abbreviations DCC Distance Cross Course in metres IDP Identifier of Project IS In service KP Kilometre Post LGH Lighthouse Spa m Metre MAG Magnetometer MBES Multibeam Echosounder nT Nanotesla OOS Out of service PMRS Preliminary Marine Route Survey PSA Post Survey Assessment ROV Remote Underwater Vehicle R/V Research Vessel SBP Sub Bottom Profiler SSS Side Scan Sonar UTM Universal Transverse Mercator UXO Unexploded Ordnance w.d. Water Depth Contract n. CT3110/2018 GAS PIPELINE INTERCONNECTION MALTA-ITALY POST SURVEY ASSESSMENT DETERMINATION OF POSITIONS OF UXOS AND CABLES Issued Checked by Approved by Date IDP File: Rev. 01 G.Sallese M.Bernardi E.Lozza 13/09/2019 MEW001 PSA - UXOs, Cables P. 5/ 63 2.0.0 GENERAL CONSIDERATIONS The company Lighthouse S.p.A of Bologna – was entrusted by Maltese Ministry for Energy and Water Management to perform a Preliminary Marine Route Survey (PMRS) in the Sicily Strait area, located between Italy and Malta. The PMRS included geophysical, geotechnical and environmental investigations. The scope of the project was to finalise the optimal pipeline route coordinates, including route turning and landing points of a 22” gas pipeline between Italy (Gela) and Malta (Delimara) (Figure 1). The objectives of the project were as follows: • Work Package 1: execution of the Preliminary Reconnaissance Marine Survey (PMRS) on the offshore pipeline routing corridor; • Work Package 2: execution of Post Survey Assessment (PSA). This document