Environmental Statement - Maersk Oil

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Balloch Field Development Environmental Statement Appendix B ‐ Environmental Assessment Major accidental events Installation Phase Loss of well control /fire explosion. Uncontrolled subsea blowout Environmental Source Aspect Emissions to air Exhaust emissions associated with installation of subsea infrastructure e.g. infield pipe‐lines, cooling spool, concrete mattresses Exhaust emissions from support vessels Loss of control of well resulting in release of oil and or subsea blowout. Two subsea blowout scenarios are assessed in Section 6. Activity Description Subsea wellheads will be fixed in position on the seabed surface. All infield pipelines will be covered with concrete mattresses and grout. Due to its minimal nature, subsea installation will require a diving support vessel only. During pipe lay opera‐ tions a survey vessel will ensure the line is laid in accordance with the selected route plan. Additional surveying activities will be commissioned as necessary . The survey vessel will have associated exhaust emissions. Damage to commercial fisheries, sediment and water quality impairment and release of atmospheric emissions. Likelihood Consequence Risk 1 5 High Potential effects and significance of potential impacts May contribute to climate change (CH4, CO2), acidification effects (SOx, NOx) and potentially localised smog formation (VOC, NOx & particulates). Likelihood Consequence Risk 5 1 Low May contribute to climate change (CH4, CO2), acidification effects (SOx, NOx) and potentially localised smog formation (VOC, NOx & particulates). Likelihood Consequence Risk 5 1 Low Inspection &engineering maintenance strategy based on preventative maintenance. Dispersant on board standby vessel available for local response. Maersk member of OSRL. Emergency Response Plan implemented in the result of a loss of well control/fire and explosion and activation of fire‐ fighting systems. Regular drills held. Mitigation of impacts and actions to address concerns Minimising operations through design. Post and pre‐installation surveys will be carried out during periods of good weather Spills may cause local elevation of hydrocarbon levels and contamination and toxic effects and socio‐economic impacts to fishing, and tourism. Oscar modelling of a blowout indicates a high risk of oil beaching on Norwegian coastlines. Mitigation measures will ensure actual risk of a spill are within tolerable levels. Residual impact and/or concern Contributes to greenhouse gases. Low impact. Contributes to greenhouse gases. Low impact. B ‐ 5
Discharges to Sea Discharge from pipeline pressure testing B ‐ 6 Discharge of fluid from the open subsea control system Disposal to land General waste from pipelay, installation of infield infra‐ structure and support vessels After installation pipelines need to be pressure tested. The lines are to be filled with potable water, dosed with biocide, oxygen scavenger, dye & corrosion inhibitor. The displaced water, along with chemical additives may be discharged to the sea surface or processed through existing facilities & reinjected with the produced water stream. Hydraulic control of subsea facilities. Control systems use water based hydraulic fluid in an open system. Pipelay and installation generate a number of wastes during routine operations including waste oil, scrap metal and domestic wastes Localised effect on water quality associated with discharge to sea of seawater containing chemicals from hydrotesting of lines. Likelihood Consequence Risk 5 1 Low In an open system fluids will be released to sea with resultant short term effects on local flora and fauna Likelihood Consequence Risk 5 1 Low Impacts associated with onshore disposal are dependent on the nature of the site or process. Landfills – land take, nuisance, emissions (methane), possible leachate, limitations on future land use. Treatment plants‐ nuisance, atmospheric emissions, potential for contamination of sites. Likelihood Consequence Risk 5 1 Low Physical presence Installation vessels Presence of installation vessels. Shipping and commercial fishing vessels are prohibited from entering the safety zones around installation vessels. Likelihood Consequence Risk 5 1 Low Balloch Field Development Environmental Statement Use of chemicals will be kept to a minimum & will be of as low a hazard quotient as practicable. Discharge of fluids, if required, will be carried out in a manner which will minimise environmental impact. All chemicals will be risk assessed as part of Offshore Chemical Regulations requirements and reported in PON 15C. Use of chemicals will be kept to a minimum & will be of as low a hazard quotient as practicable Discharge of fluids, if required, will be carried out in a manner which will minimise environmental impact Wastes will be minimised by use of appropriate procurement controls. All wastes to be properly segregated for recycling /disposal onshore. Waste will be dealt with in accordance with regulatory requirements. The installation vessels will be present for as short a time as possible. Other users of the sea area will be notified of the vessel presence and vessel movements Appendix B ‐ Environmental Assessment Rapid dispersion and dilution will occur in close proximity to the discharge point. Low impact. Water based hydraulic fluid that has will rapidly l disperse in close proximity to the discharge point. Low impact. Contribute to pressures on land based waste disposal. Balloch associated wastes predicted to have a Low impact. Only a temporary physical obstruction to other sea users. Low impact.
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Environmental Statement Balloch Fie
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Balloch Field Development Environme
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Page 145 and 146: Balloch Field Development Environme
Page 193 and 194: B ‐ 2 Halocarbon release during e
Page 195: B ‐ 4 Lube and hydraulic oil spil
Page 199 and 200: Production Phase Environmental Aspe
Page 201 and 202: B ‐ 10 Drainage water Discharge o
Page 203 and 204: Physical presence Oil and gas infra
Page 205 and 206: Major accidental events Other envir
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Environmental Statement - Maersk Oil

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