Extraction Plan - Peabody Energy

Extraction Plan – North Wambo Underground Mine Longwalls 7 and 8Table 21 (Continued)Longwalls 7 and 8 Monitoring Program SummaryManagement Plan Monitoring Component Parameter FrequencyBuilt FeaturesManagement Plan –WCPL Asset ManagementPlanAll built features.Above ground powerlines.Active service lines.Roads and tracks.Mine dewatering and watersupply pipelines.Portal seals to HomesteadMine workings.• Visual observations to record the generalcondition of WCPL assets including safety andserviceability.• 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 the generalcondition of WCPL active service lines includingsafety and serviceability.• 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.• Potential for water ingress as required by theInrush Management Plan.• Monthly inspection duringsecondary extraction of Longwalls 7and 8.• Prior to secondary extraction within100 m of WCPL powerline andundertaken at 50 m intervals untilthe active mining face is 100 m pastthe powerline.• Daily inspections commencing whensecondary extraction is within 100 mof WCPL active service lines andundertaken until the active miningface is 100 m past the line.• Prior to secondary extraction within100 m of any WCPL asset andundertaken at 50 m intervals untilthe active mining face is 100 m pastthe WCPL asset.• Daily inspections commencing whensecondary extraction is within 100 mof WCPL active service lines andundertaken until the active miningface is 100 m past the pipeline.• Continuous (SCADA) monitoring ofpump and pipeline conditions.• As required by the InrushManagement Plan.EP/SMP LW7-8 Rev B December 2012 Page 51