Environmental Statement - Maersk Oil

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Balloch Field Development Environmental Statement Appendix B ‐ Environmental Assessment APPENDIX B – ENVIRONMENTAL ASSESSMENT Potential impacts for each key project and associated environmental effect before and after mitigation measures. Drilling Phase Key High Moderate Low Environmental Source Aspect Emissions to air Exhaust emissions from drilling operations Well clean up and testing Exhaust emissions from support vessels and helicopter transfers Discharge of CFCs and HCFCs Activity Description Generation of power during the proposed drilling operations will result in emissions of various combustible gases. Well test flaring will result in the emissions of various combustible gases. Support vessels consist of anchor handling vessels, supply vessel, standby vessel. Traditionally CFCs have been utilised as a coolant medium in refrigeration units 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 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 CFCs contribute to ozone depletion and are regarded as greenhouse gases. In 2010, the NTvL resulted in approximately 0.23 tonnes of HCF refrigerant R422D, which is relatively low Likelihood Consequence Risk Mitigation of impacts and actions to address concerns Audit to ensure rig complies with UK standards, engines are maintained and operated correctly. Residual impact and/or concern Contributes to greenhouse gases. Low impact. Use of low sulphur diesel in vessels. No extended well test. Contributes to greenhouse gases. Low impact. Minimise vessel travel times, number of vessels required and length of time vessel remains on location. Drilling rig contractors are phasing out the use of HCFCs in compliance with legal requirements. Contributes to greenhouse gases. Low impact. None envisaged as the development should not lead to any release. Negligible impact. B ‐ 1
B ‐ 2 Halocarbon release during emergency events Discharges to Sea Deliberate discharges from drilling operations Contained and treated drilling fluids Contained and treated drainage water Liquid waste (domestic sewage) Fire fighting systems can be designed to release harmful halocarbons WBM and cuttings, brine, cementing chemicals & clean up chemicals all required in the drilling process Rotomill treated OBMs, OBM contaminated brine spacer, cuttings & cleaning chemicals. Other oily slops. Open drains collect spills & drainage water from all hazardous areas on the rig. These drains feed into the drainage cassion which provides oil & water separation. Discharge of sewage (grey & black water macerated to < 6mm prior to discharge via a sewage caisson). 2 1 Low Halons cause depletion in the upper atmosphere and are regarded as greenhouse gases Likelihood Consequence Risk 2 1 Low Short term impact on water quality and localised smothering of seabed and associated biota Likelihood Consequence Risk 5 2 Moderate Release of untreated OBM’s can result in toxic or sub‐lethal effects on sensitive organisms and ecosystems. Bioaccumulation of heavy metals in marine organisms. Burial of benthic organisms/ modification to the benthic environment. Likelihood Consequence Risk 5 1 Low Uncontrolled discharge of oil in water can result in narcotic, toxic, teratogenic impacts and localised water column enrichment etc. Likelihood Consequence Risk 2 2 Low Sewage and food waste has a high BOD resulting from organic & other nutrient matter in the detergents & human wastes that can impair water quality in the immediate vicinity of the discharge. Likelihood Consequence Risk Balloch Field Development Environmental Statement Drilling rig contractors are phasing out halons in compliance with legal requirements. Halocarbons will only be used in the event of a fire. Maximum efficient use of WBM. Brine contaminated with oil to be shipped to shore for treatment and disposal Use of PLONAR chemicals (i.e. low toxicity chemicals). All OBM’s will be processed using Rotomill % of oil on cuttings discharged < 0.1% MARPOL compliant filtration and monitoring equipment with discharges of oil in water at less than 15ppm. Tanks and machinery spaces are fitted with bunding to collect spillages and waste. Drains are plugged on NTVL. Sewage treatment unit on board rig (MARPOL) and vessels to reduce BOD prior to discharge, this will aid biological breakdown on release. Appendix B ‐ Environmental Assessment None envisaged as the development should not lead to any releases. Negligible impact. Minimal discharge of WBM to sea with only localised temporary effects on the water column and seabed. Low impact. No detectable increase in the water column or sediments of any the OBM drilling fluids or chemicals discharged. Low impact. Good working practice will minimise any potential spillage. Negligible impact. Negligible impact.
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Page 195 and 196: B ‐ 4 Lube and hydraulic oil spil
Page 197 and 198: Discharges to Sea Discharge from pi
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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