Don Field Decommissioning Programme (pdf, 7.8MB) null - BP

Don Field Decommissioning ProgrammeDON-BP-0011 IntroductionAn important aspect of the decommissioning process is to understand the impact on theenvironment of the decommissioning process and to monitor the changes that will occurin the local region once all activities are complete.2 Environmental SurveysResults of the pre-decommissioning photographic survey of the drill cuttings can befound in RSK document number 60113 [17.1].Two further surveys will be post (1 year and 4 years) the decommissioning activities.These surveys will assess the extent of the re-colonisation of the area and compare itagainst historic survey results. Additional surveys, if required, and time period betweenthem will be agreed with the Department of Energy and Climate Change (DECC) afterthe decommissioning programme is implemented and the planned surveys delivered.The scope of the post -decommissioning survey will be agreed with the DECC beforethe work is carried out and the survey results submitted to the DECC. The environmentalsurvey is likely to be based upon the sample stations in historic survey to allowtemporary recovery trends to be evaluated. Samples will be analysed for hydrocarbon,metals and other trace contaminants.3 Monitoring of RemainsThe Don Owners will ensure that the site remains free from obstructions. This willinvolve a monitoring programme to review the condition of the site, the structure and allother material left in situ, to ensure they remain as expected as a result of the DonDecommissioning Programme. The method of inspection will be the most appropriateavailable at the time of survey.The first survey will be carried out within 1 year of completion of the decommissioningwork to provide baseline survey data and a second survey will be carried out within 3years of the initial post-decommissioning survey. A future survey regime will bedetermined in conjunction with the DECC, based on the analysis of the first two surveys.4 References[17.1] RSK Pre-decommissioning Photographic Survey of the Don Drill Cuttings,document number 60113.Pre and Post-decommissioning Monitoring and MaintenanceMay 2011 17-1/2