ENVIRONMENTAL STATEMENT BARDOLINO DEVELOPMENT

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Bardolino Development Environmental Statement Activity / Source of Potential Impact Possible Environmental Effects Prevention, Control & Mitigation Measures Significance Rating (refer Table 5.3 for key) 2. Installation and Commissioning of Pipelines, Umbilical, Manifold and Valve Skid 2.6 Gaseous emissions from power generation on installation and commissioning vessels 2.7 Discharge to sea of drainage or sewage from installation and commissioning vessels 2.8 Disposal of solid waste from installation and commissioning vessels 2.9 Commissioning and testing of pipelines, umbilical, manifold and valve skid • The burning of diesel fuel on the installation and commissioning vessels would release gaseous emissions to atmosphere. • This could lead to deterioration in air quality in the immediate vicinity of the exhaust outlets. • Gaseous emissions could also contribute to global processes such as global warming, acid deposition and low-level ozone formation (cumulative and transboundary impacts). • All engines, generators and other combustion plant would be well maintained and correctly operated, to ensure that they were working as efficiently as possible to minimise emissions. Page 5-12 April 2008 Minor • In the exposed and generally windy conditions offshore, the gaseous emissions would disperse rapidly after release, thus ensuring there was no local cumulative effect. • Please refer to item 1.8 • Please refer to item 1.8 Minor: Please refer to item 1.8 • Please refer to item 1.9 • Please refer to item 1.9 Minor: Please refer to item 1.9 • The permitted discharge to sea of pipeline testing and commissioning chemicals could affect water quality at the discharge site. • Only the types and amounts of chemicals essential to demonstrate the integrity and fitness of the pipeline would be used. • The chemicals would be carefully selected so as to minimise potential environmental effects, in accordance with Offshore Chemical Regulations 2002. • The gaseous emissions that would arise from power generation processes on the vessels would make a very small contribution to world-wide levels of atmospheric contaminants, when compared to other industrial sources. Minor • The concentrations of chemicals in the pipeline during testing and commissioning would be low. • Assessment under the Offshore Chemical Regulations 2002 will have demonstrated that the discharge of such chemicals would not be likely to have a significant environmental effect.
Bardolino Development Environmental Statement Activity / Source of Potential Impact Possible Environmental Effects Prevention, Control & Mitigation Measures Significance Rating (refer Table 5.3 for key) 2. Installation and Commissioning of Pipelines, Umbilical, Manifold and Valve Skid 2.10 Noise from installation and commissioning vessels 2.11 Physical presence of contingency rock dump • Noise from the thrusters of the dynamically positioned (DP) installation and commissioning vessel may result in underwater noise levels that would cause temporary disturbance to marine mammals. • Approximately 20,000 tonnes of graded rock would be required to stabilise the piggybacked pipelines along open trench to prevent upheaval buckling. • The engines and other equipment on the installation and commissioning vessels would be well-maintained, and this would help to reduce the level of noise emitted. • Use of a fall-pipe on the rockdump vessel, and ROV supervision will ensure the rockdump is placed in the correct position. • Location and profile of rockdumps would be made available to fishermen and fishing interests. Profile will be designed to minimise the risk of fishing gear snagging. • Rockdump in the open trenches will become naturally backfilled by surrounding sediments. April 2008 Page 5-13 Minor • The densities of marine mammals in the Bardolino area (in particular harbour porpoise) is moderate to high when compared to the other areas of the North Sea. • The pipe-laying activities would be limited to a period of about 6 weeks . • The underwater noise levels that would be created by the DP lay vessels and other vessels would be similar to that created by medium/large merchant vessels. • Modelling shows that at the frequencies to which the key marine mammals are most sensitive, noise levels sufficient to cause avoidance reactions would extend to only a few kilometres around the pipelaying and umbilical laying vessel spread. In such circumstances, very small numbers of marine mammals would be exposed to disturbing levels of noise. • The noise from the DP pipelay and umbilical lay vessels and other vessels would not start suddenly, would vary in intensity, and would move progressively along the pipeline route. Marine mammals would therefore be unlikely to be exposed suddenly to very loud noise, and could move away if noise levels increased gradually to levels that caused disturbance. Moderate • Clean sediments which are disturbed will be quickly recolonised by natural fauna, from adjacent, undisturbed sites. • The benthic community is typical of that found over large areas of this part of the central North Sea; no unique or protected species are present.
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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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