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) 3. Production, Utility and Maintenance Operations 3.1 Discharge of produced water at Nelson 3.2 Use of production chemicals • Produced water containing dispersed oil from Bardolino will be discharged at the Nelson installation. The total quantity discharged will increase as a result of the project. Increased levels of dispersed oil in the produced water discharged could have an impact on seabirds, plankton and fish in the vicinity of the installation. • The use and possible discharge of additional production chemicals could cause impact to the marine environment. • The use of additional corrosion inhibitor may have an adverse effect on oil in produced water separation which could have an impact on the marine environment. • The majority of produced water at Nelson is reinjected using the Produced Water Re-injection (PWRI) system. Bardolino produced water will be generated through Nelson as production from Howe declines leading to a minor net increase in discharge. • All production chemicals would be selected and assessed according to the Offshore Chemical Regulations 2002, in order to minimise impacts to the marine environment. Moderate – see Section 6 • The Bardolino project will lead to a net increase in the quantity of produced water containing dispersed oil discharged at Nelson. • The quantity of produced water from Bardolino will represent only around 1% of the total produced water handled at the Nelson platform. • Due to limits on produced water handling capacity at Nelson an additional volume of produced water equal to that produced from Bardolino will be discharged to sea. Moderate – see Section 6 • The use of additional corrosion inhibitor in combination with the fine solids that will be present in the Bardolino produced fluids has the potential to reduce the effectiveness of oil in produced water separation on Nelson and increase the quantity of dispersed oil discharged to sea. Any increase in dispersed oil levels will be managed in accordance with the conditions of the Nelson permit under the Offshore Petroleum Activities (Oil Pollution Prevention and Control) (OPPC) Regulations 2005. Page 5-14 April 2008
Bardolino Development Environmental Statement Activity / Source of Potential Impact Possible Environmental Effects Prevention, Control & Mitigation Measures Significance Rating (refer Table 5.3 for key) 3. Production, Utility and Maintenance Operations, continued 3.3 Impacts associated with maintenance vessels. • The burning of diesel fuel on the 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). • Discharge to sea of drainage water and sewage from vessels could lead to localized organic enrichment in the vicinity of the discharge location. • The use of onshore facilities for the treatment and disposal of waste could lead to a variety of onshore 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. • There would be systems in place on the vessels to ensure that drainage discharges complied with MARPOL. This requires that the vessels must be fitted with oil-water separation and filtration equipment, to ensure that the concentration of oil in any discharged water is less than 15 ppm. • Sewage would be macerated on the vessels to aid biological breakdown once discharged into the sea. • Food waste would be macerated as required by MARPOL and Merchant Shipping (Prevention of Pollution by Garbage) Regulations 1998; this would aid its dispersal and decomposition in the water column. • All other waste would be segregated and contained, and then shipped to shore for recycling or disposal by a licensed company in full compliance with UK waste legislation and Duty of Care. • Shell regularly audits its approved onshore waste disposal contractors, to ensure all procedures and legal requirements are adhered to. Negligible • All the maintenance activities would be carried out within the 500 m exclusion zone. • In the exposed and generally windy conditions offshore, the gaseous emissions would disperse rapidly after release, thus ensuring there was no local cumulative effect. • 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. • Only small volumes of drainage water would be discharged from the rig’s machinery space, and the concentration of oil would be low. • In the generally energetic conditions offshore in the North Sea, such small volumes of water would be rapidly dispersed and diluted. • At the offshore location, the small volumes of macerated sewage would be rapidly dispersed in the water column and be insignificant in terms of organic enrichment. • The particles of food waste would be
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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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