Extraction Plan - Peabody Energy

Extraction Plan – North Wambo Underground Mine Longwalls 7 and 8Summary of Monitoring and Management Commitments (Continued)Component Monitoring Management ReferenceWCPL Assets • Visual observations to record the generalcondition of WCPL assets including safety andserviceability.• Assessment of WCPL assets to identify modificationspotentially required prior to subsidence.Section 3.4 andAppendix DPrescribed DamsAusgrid 11 kilovoltPowerline• Monitoring of the location of the base and top ofeach power pole.• Monitoring of the vertical distance from theground to lowest point of the powerline betweeneach power pole pair (i.e. conductor clearance).• Visual observations to record condition of roadsand tracks, including surface cracks, bucklingand general safety.• Monitoring of pipeline integrity at fixed points.• Monitoring to detect abnormal changes in flow.• Maintenance of safe access to WCPL assets.• Implementation of communication protocols to ensureinternal WCPL stakeholders are aware of the longwallprogression.• Posting of warning signs at suitable locations on old haulroads and site access tracks and updating warning signsif a change to the WCPL asset is identified duringmonitoring.• Provision of 15 m separation barrier around theHomestead pit highwall.• Following subsidence, fitting of WCPL powerlines withstays where affected by subsidence.• Structural assessment of WCPL assets and subsidenceassessment post-Longwalls 7 and 8 extraction.• Repair of WCPL assets in accordance with associatedstandards and procedures.• Detailed monitoring and management measures for Prescribed Dams would be developed by WCPL as part ofapplications for mining within the South Wambo Dam Notification Area and the North East Tailings DamNotification Area which would be submitted to the Dams Safety Committee prior to mining within the NotificationAreas.• Decommissioning of the powerline is proposed prior to subsidence.• If the powerline is not decommissioned, preparation of an Ausgrid Asset Management Plan in consultation withAusgrid for the management of this powerline.Section 3.4 andAppendix DSection 3.4 andAppendix DEP/SMP LW7-8 Rev B December 2012 Page v