Environmental statement - Flyndre and Cawdor - Maersk Oil

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Flyndre and Cawdor Environmental Statement Section 7 Conclusions 7. CONCLUSIONS A detailed EIA of the development has been carried out in order to determine the potential impacts on the environment and their significance. The identification of the potential impacts was based on the nature of the proposed activities and was undertaken using available literature and guidance documents, industry specific experience and discussions with relevant authorities including DECC, JNCC and Marine Scotland. The EIA process will continue throughout the project with the incorporation of the commitments made in this ES into the design process, construction and ultimately affecting the way in which the field is produced. 7.1. ENVIRONMENTAL EFFECTS The development area is considered to be a typical CNS offshore environment there are no biological habitats or other features that are particularly sensitive to the type of development proposed. No Annex I habitats are present within the vicinity of the development. The project may impact very briefly upon fisheries in the area during the installation period. The environmental aspects of the key activities during the production phase were identified and, where possible, the potential effects quantified in terms of their likelihood, potential significance and magnitude. The results were assessed on the basis of the risk posed to the environment and were summarised as either low, moderate or high risk. The initial screening assessment showed that the majority of the key activities are of low risk and that there are no key activities which are of high risk. During the drilling phase the risk associated with the deliberate discharge of drilling fluids and the associated chemicals were found to be moderate. An uncontrolled 90 day blowout from wells was also found to be of a moderate risk as no beaching is predicted to occur. Noise resulting from piling was also found to be of a moderate risk as was the discharge of produced water during production. Disturbance of historic cuttings piles at the Clyde platform was also identified as a moderate environmental risk, further engineering studies are planned in relation to the design of the riser and umbilical tie in points, only when this is completed will a better assessment of the potential for disturbance of cuttings be possible, so this is remains a project uncertainty. Following the identification of suitable mitigation measures, an additional assessment was undertaken for the activities which were initially identified to be of moderate risk. With the adoption of appropriate mitigation there are only low residual risks to the environment. 7.2. MINIMISING ENVIRONMENTAL IMPACT Overall, the execution of the proposed development following the incorporation of the control measures, is not expected to have a significant impact on the environment. In order to capture the commitments and environmental issues identified from the assessment of the Flyndre and Cawdor development, these will be transferred into Maersk Oil’s action tracker, ‘Synergi’. The Synergi system is used for the management of reports and data relating to and actions resulting from: Incidents Audits D/4114/2011 7 ‐ 1
Inspections Reviews Investigations Synergi is used for the following environmental items: Environmental emissions/spills, including hydrocarbon leaks Breaches of legal requirements including breaches of permits Actions arising from audits, inspections and reviews 7‐ 2 D/4114/2011 Flyndre adn Cawdor Environnemental Statement Section 6 Conclusions The Synergi system implements the requirements of ISO14001 for the tracking of non‐conformance and corrective and preventive action. All non‐conformances to the requirements of the EMS are recorded and reviewed. Suitable action is taken to correct each non‐conformance, deal with any environmental impacts resulting from it and, where necessary, initiate appropriate action taken to eliminate the cause of the non‐conformance. Target dates and people responsible for ensuring the measures are implemented will be identified for each of the mitigation measures. Synergi is reviewed on a monthly basis and overdue actions brought to the management’s attention. Commitments and mitigation measures to minimise the impact of the development on the environment have been highlighted throughout the ES and are summarised below. They have been separated out into drilling, subsea installation, production and accidental events. Drilling: Atmospheric emissions The drilling rig will be subject to audits ensuring compliance with UK legislation. The impact from emissions will be mitigated by optimising support vessel efficiency. Low sulphur fuels will be used in accordance with prevailing EU and MARPOL requirements. Drilling: Discharges to sea Period of well testing will be kept to a minimum ‘Green burners’ will be employed for well test operations, which will significantly reduce the levels of unburned hydrocarbons entering the environment. During flaring continuous observation of the sea surface will occur. The test will be suspended should a significant sheen be observed OBM and drill cuttings will be Rotomill treated before discharged to the seabed. Drilling: Physical presence Pre‐deployment surveys will be undertaken and will be used to identify anchor locations. The anchors will be deployed in such a way as to minimise the risk of interaction with existing infrastructure.
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Environmental statement - Flyndre and Cawdor - Maersk Oil

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