ENVIRONMENTAL STATEMENT BARDOLINO DEVELOPMENT

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Bardolino Development Environmental Statement Figure 3.5: Bardolino pipeline and umbilical routes corridor April 2008 Page 3-17
Bardolino Development Environmental Statement 3.5.3 Pipeline Installation The pipe lay operations will be conducted by a DP vessel. The use of a DP vessel will avoid the use of anchors and so prevent localised disruption to the seabed caused by the repeated placement and retrieval of anchors. The DP vessel will generate more emissions to atmosphere from power generation than an anchored vessel, but no anchor handling vessels will be required, thereby reducing total emissions. The DP system may also create increased underwater noise through the use of thrusters. The overall activity is planned to last only 30 days, however, and emissions and discharges during this time will be equivalent to those from normal shipping activities. Bridging documents between Shell and the installation contractors operating the pipeline installation vessels will describe the management structure and division of responsibilities that will prevail during the operations, the methodology for executing the work programme, and the emergency response procedures. At this stage it is planned that the piggyback pipelines will be laid in a single trench (with the umbilical laid in a separate, parallel trench) constructed by a towed pipeline plough. The trench is expected to be 1.8 m deep and 6.2 m wide at the top, with a 30 degree side slope (Figure 3.6), so the area of seabed disturbance for this pipeline’s trench would be approximately 12,400 m 2 . Figure 3.6: Trench and burial of the 6” and 3” piggyback pipelines Following ploughing, the pipelines will either be: 1. Covered using a backfill plough to recover the excavated material back into the trench; or 2. Blanket rock dumped along the 2 km length of the pipeline route from Bardolino to Howe, to cover the pipelines in the trench; or 3. Covered using a backfill plough to recover the excavated material back into the trench, with some spot rock dumping limited to specific points where a risk of upheaval buckling is identified. The final selection of the installation method will be driven by both technical and economic considerations. If blanket cover were to be used, the total quantity of rock required would be approximately 20,000 t deposited from a DP vessel. The total area of seabed which would be covered by this rock dump would be approximately 6.2 m x 2 km (12,400 m 2 ) for the trench containing the piggyback pipelines. If a backfill plough is mobilised to cover the pipelines using the excavated material, and rock is used only for spot dumping of sections where the Page 3-18 April 2008
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13 th March 2008 Dear Sir or Madam,
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To: Paul Wood Shell U.K Limited, Se
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What risks to marine mammals do pil
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Noise propagation modelling. Noise
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If, for any reason, piling operatio
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APPPENDIX 1 MARINE MAMMAL RECORDING
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ENVIRONMENTAL STATEMENT BARDOLINO DEVELOPMENT

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