concept EIA-rapport - Staatsolie

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SRK Consulting: Project No: 439414 Staatsolie Pipeline EIA – Draft EIA Report Page 86 6.9.2 Conceptual Decommissioning Plan The objective of the Conceptual Decommissioning Plan is to provide recommendations for the decommissioning of the pipeline and rehabilitation of the area at the end of the operational lifespan of the project, to achieve sustainable land use conditions and avoid or minimise costs and long term liabilities to Staatsolie. The method of decommissioning is likely to vary between above-ground and underground pipeline sections. As such, it is expected that: • Above-ground sections of the pipelines will be removed upon decommissioning. This is expected to involve the depressurising and purging of the pipeline, physical removal of the pipe and all associated structures and rehabilitation of the pipeline corridor. Maintenance of the corridor is discontinued; and • Underground sections of the pipelines will be abandoned in situ, as international best practice recognises that removing pipelines from the ground is unlikely to be a commercially or environmentally viable option (APIA, 2009). This is expected to involve the physical disconnection, purging, cleaning and sealing (capping) of the pipelines. The pipe would then be left to corrode and biodegrade in situ 39 . The plan recommends measures to implement during the following three phases of the pipelines project: • Operations Phase: These measures relate to the minimisation of closure costs (e.g. through ongoing containment of pollutants) and the successful planning of decommissioning. • Decommissioning Phase: These measures are applicable during the decommissioning of the pipelines project or individual pipelines to minimise residual impacts on the environment. • Post closure: These measures include potential monitoring requirements, where appropriate, following the decommissioning of the pipelines project or individual pipelines to monitor any residual impacts on the environment post closure, based on information available at the time of compiling the plan. These measures are presented in Table 6-17. 39 Any ground subsidence due to the long term structural deterioration of a pipeline abandoned in place is considered unlikely to be a critical issue by the Canadian Association of Petroleum Producers, as a structural failure due to corrosion may take many decades and significant lengths of pipeline would not collapse at the same time. Ground subsidence would be negligible for pipelines up to 232.9mm in diameters. Filling with an inert material may be appropriate at critical locations (e.g. infrastructure crossings). This will need to be determined in consultation with the relevant authorities at the time of decommissioning and take into account the long term plans for the pipeline (APIA, 2009). REUT/DALC 439414_StaatsoliePipelineEIA_Draft EIA Report_Final June 2012
SRK Consulting: Project No: 439414 Staatsolie Pipeline EIA – Draft EIA Report Page 87 Table 6-17: Measures recommended for decommissioning Aspect ID Measure / Procedure Responsible Implementation timeframe OPERATIONS PHASE Minimise decommissioning costs Determine decommissioning requirements 1. • Ensure that the pipelines are well maintained. • Staatsolie Refining 2. • Ensure that any spills are addressed and cleaned up immediately. Operations Manager 3. • Keep maintenance and monitoring data to facilitate a review of the operational history of the pipelines to inform decommissioning. 4. • Maintain an inventory of existing equipment and hazardous materials used. Use information on operational history to determine potentially contaminated areas. 5. • Undertake soil and groundwater sampling where the possibility of contamination is suspected. Dispose of contaminated soil / mark contaminated areas appropriately. 6. • Determine the potential ecological and health implications of contaminated areas and inform the relevant authorities accordingly. 7. • Initiate consultation with key stakeholders (e.g. relevant authorities, affected landowners) before any planned decommissioning to discuss potential decommissioning options and methods. 8. • Determine other potential commercial uses for the pipelines (and infrastructure) to be decommissioned (e.g. use for other products / by other operators). 9. • Identify and assess any potential environmental and societal risks associated with the standard assumed method of decommissioning (removal of above-ground pipes and abandonment in situ of underground pipes). 10. • Address potentially significant environmental and societal risks by amending the proposed method of decommissioning to prevent any significant adverse impacts. 11. • Review operational history of the pipeline(s) to be decommissioned. • Staatsolie Refining Operations Manager • Throughout operations • Approximately 1 year before planned decommissioning • Approximately 6 months before planned decommissioning Monitoring methods Performance indicators • As per EMMP • As per EMMP • Regularly review that data and backups thereof are kept • Review inventory protocol and results • Review test protocol and results • Continuity of data • Number of areas investigated • Number of areas identified as polluted • Success of remediation • Cost of remediation • Review study • Risks identified • Monthly review of progress • Number of stakeholders notified • Completion of relevant milestones REUT/DALC 439414_StaatsoliePipelineEIA_Draft EIA Report_Final June 2012
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